Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007 Oracle. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public |
| 6 | * License v2 as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public |
| 14 | * License along with this program; if not, write to the |
| 15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 16 | * Boston, MA 021110-1307, USA. |
| 17 | */ |
| 18 | |
| 19 | #include <linux/kernel.h> |
| 20 | #include <linux/bio.h> |
| 21 | #include <linux/buffer_head.h> |
| 22 | #include <linux/file.h> |
| 23 | #include <linux/fs.h> |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 24 | #include <linux/fsnotify.h> |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 25 | #include <linux/pagemap.h> |
| 26 | #include <linux/highmem.h> |
| 27 | #include <linux/time.h> |
| 28 | #include <linux/init.h> |
| 29 | #include <linux/string.h> |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 30 | #include <linux/backing-dev.h> |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 31 | #include <linux/mount.h> |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 32 | #include <linux/mpage.h> |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 33 | #include <linux/namei.h> |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 34 | #include <linux/swap.h> |
| 35 | #include <linux/writeback.h> |
| 36 | #include <linux/statfs.h> |
| 37 | #include <linux/compat.h> |
| 38 | #include <linux/bit_spinlock.h> |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 39 | #include <linux/security.h> |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 40 | #include <linux/xattr.h> |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 41 | #include <linux/vmalloc.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 42 | #include <linux/slab.h> |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 43 | #include <linux/blkdev.h> |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 44 | #include <linux/uuid.h> |
Filipe Brandenburger | 55e301f | 2013-01-29 06:04:50 +0000 | [diff] [blame] | 45 | #include <linux/btrfs.h> |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 46 | #include <linux/uaccess.h> |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 47 | #include "ctree.h" |
| 48 | #include "disk-io.h" |
| 49 | #include "transaction.h" |
| 50 | #include "btrfs_inode.h" |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 51 | #include "print-tree.h" |
| 52 | #include "volumes.h" |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 53 | #include "locking.h" |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 54 | #include "inode-map.h" |
Jan Schmidt | d7728c9 | 2011-07-07 16:48:38 +0200 | [diff] [blame] | 55 | #include "backref.h" |
Josef Bacik | 606686e | 2012-06-04 14:03:51 -0400 | [diff] [blame] | 56 | #include "rcu-string.h" |
Alexander Block | 31db9f7 | 2012-07-25 23:19:24 +0200 | [diff] [blame] | 57 | #include "send.h" |
Stefan Behrens | 3f6bcfb | 2012-11-06 15:08:53 +0100 | [diff] [blame] | 58 | #include "dev-replace.h" |
Filipe David Borba Manana | 6354192 | 2014-01-07 11:47:46 +0000 | [diff] [blame] | 59 | #include "props.h" |
Jeff Mahoney | 3b02a68 | 2013-11-01 13:07:02 -0400 | [diff] [blame] | 60 | #include "sysfs.h" |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 61 | #include "qgroup.h" |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 62 | |
Hugo Mills | abccd00 | 2014-01-30 20:17:00 +0000 | [diff] [blame] | 63 | #ifdef CONFIG_64BIT |
| 64 | /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI |
| 65 | * structures are incorrect, as the timespec structure from userspace |
| 66 | * is 4 bytes too small. We define these alternatives here to teach |
| 67 | * the kernel about the 32-bit struct packing. |
| 68 | */ |
| 69 | struct btrfs_ioctl_timespec_32 { |
| 70 | __u64 sec; |
| 71 | __u32 nsec; |
| 72 | } __attribute__ ((__packed__)); |
| 73 | |
| 74 | struct btrfs_ioctl_received_subvol_args_32 { |
| 75 | char uuid[BTRFS_UUID_SIZE]; /* in */ |
| 76 | __u64 stransid; /* in */ |
| 77 | __u64 rtransid; /* out */ |
| 78 | struct btrfs_ioctl_timespec_32 stime; /* in */ |
| 79 | struct btrfs_ioctl_timespec_32 rtime; /* out */ |
| 80 | __u64 flags; /* in */ |
| 81 | __u64 reserved[16]; /* in */ |
| 82 | } __attribute__ ((__packed__)); |
| 83 | |
| 84 | #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \ |
| 85 | struct btrfs_ioctl_received_subvol_args_32) |
| 86 | #endif |
| 87 | |
| 88 | |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 89 | static int btrfs_clone(struct inode *src, struct inode *inode, |
Mark Fasheh | 1c919a5 | 2015-06-30 14:42:08 -0700 | [diff] [blame] | 90 | u64 off, u64 olen, u64 olen_aligned, u64 destoff, |
| 91 | int no_time_update); |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 92 | |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 93 | /* Mask out flags that are inappropriate for the given type of inode. */ |
| 94 | static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) |
| 95 | { |
| 96 | if (S_ISDIR(mode)) |
| 97 | return flags; |
| 98 | else if (S_ISREG(mode)) |
| 99 | return flags & ~FS_DIRSYNC_FL; |
| 100 | else |
| 101 | return flags & (FS_NODUMP_FL | FS_NOATIME_FL); |
| 102 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 103 | |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 104 | /* |
| 105 | * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. |
| 106 | */ |
| 107 | static unsigned int btrfs_flags_to_ioctl(unsigned int flags) |
| 108 | { |
| 109 | unsigned int iflags = 0; |
| 110 | |
| 111 | if (flags & BTRFS_INODE_SYNC) |
| 112 | iflags |= FS_SYNC_FL; |
| 113 | if (flags & BTRFS_INODE_IMMUTABLE) |
| 114 | iflags |= FS_IMMUTABLE_FL; |
| 115 | if (flags & BTRFS_INODE_APPEND) |
| 116 | iflags |= FS_APPEND_FL; |
| 117 | if (flags & BTRFS_INODE_NODUMP) |
| 118 | iflags |= FS_NODUMP_FL; |
| 119 | if (flags & BTRFS_INODE_NOATIME) |
| 120 | iflags |= FS_NOATIME_FL; |
| 121 | if (flags & BTRFS_INODE_DIRSYNC) |
| 122 | iflags |= FS_DIRSYNC_FL; |
Li Zefan | d0092bd | 2011-04-15 03:03:06 +0000 | [diff] [blame] | 123 | if (flags & BTRFS_INODE_NODATACOW) |
| 124 | iflags |= FS_NOCOW_FL; |
| 125 | |
| 126 | if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS)) |
| 127 | iflags |= FS_COMPR_FL; |
| 128 | else if (flags & BTRFS_INODE_NOCOMPRESS) |
| 129 | iflags |= FS_NOCOMP_FL; |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 130 | |
| 131 | return iflags; |
| 132 | } |
| 133 | |
| 134 | /* |
| 135 | * Update inode->i_flags based on the btrfs internal flags. |
| 136 | */ |
| 137 | void btrfs_update_iflags(struct inode *inode) |
| 138 | { |
| 139 | struct btrfs_inode *ip = BTRFS_I(inode); |
Filipe Manana | 3cc7939 | 2014-06-25 22:36:02 +0100 | [diff] [blame] | 140 | unsigned int new_fl = 0; |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 141 | |
| 142 | if (ip->flags & BTRFS_INODE_SYNC) |
Filipe Manana | 3cc7939 | 2014-06-25 22:36:02 +0100 | [diff] [blame] | 143 | new_fl |= S_SYNC; |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 144 | if (ip->flags & BTRFS_INODE_IMMUTABLE) |
Filipe Manana | 3cc7939 | 2014-06-25 22:36:02 +0100 | [diff] [blame] | 145 | new_fl |= S_IMMUTABLE; |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 146 | if (ip->flags & BTRFS_INODE_APPEND) |
Filipe Manana | 3cc7939 | 2014-06-25 22:36:02 +0100 | [diff] [blame] | 147 | new_fl |= S_APPEND; |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 148 | if (ip->flags & BTRFS_INODE_NOATIME) |
Filipe Manana | 3cc7939 | 2014-06-25 22:36:02 +0100 | [diff] [blame] | 149 | new_fl |= S_NOATIME; |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 150 | if (ip->flags & BTRFS_INODE_DIRSYNC) |
Filipe Manana | 3cc7939 | 2014-06-25 22:36:02 +0100 | [diff] [blame] | 151 | new_fl |= S_DIRSYNC; |
| 152 | |
| 153 | set_mask_bits(&inode->i_flags, |
| 154 | S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC, |
| 155 | new_fl); |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 156 | } |
| 157 | |
| 158 | /* |
| 159 | * Inherit flags from the parent inode. |
| 160 | * |
Josef Bacik | e27425d | 2011-09-27 11:01:30 -0400 | [diff] [blame] | 161 | * Currently only the compression flags and the cow flags are inherited. |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 162 | */ |
| 163 | void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) |
| 164 | { |
Chris Mason | 0b4dcea | 2009-06-11 11:13:35 -0400 | [diff] [blame] | 165 | unsigned int flags; |
| 166 | |
| 167 | if (!dir) |
| 168 | return; |
| 169 | |
| 170 | flags = BTRFS_I(dir)->flags; |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 171 | |
Josef Bacik | e27425d | 2011-09-27 11:01:30 -0400 | [diff] [blame] | 172 | if (flags & BTRFS_INODE_NOCOMPRESS) { |
| 173 | BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS; |
| 174 | BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; |
| 175 | } else if (flags & BTRFS_INODE_COMPRESS) { |
| 176 | BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS; |
| 177 | BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS; |
| 178 | } |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 179 | |
Liu Bo | 213490b | 2012-09-11 08:33:50 -0600 | [diff] [blame] | 180 | if (flags & BTRFS_INODE_NODATACOW) { |
Josef Bacik | e27425d | 2011-09-27 11:01:30 -0400 | [diff] [blame] | 181 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; |
Liu Bo | 213490b | 2012-09-11 08:33:50 -0600 | [diff] [blame] | 182 | if (S_ISREG(inode->i_mode)) |
| 183 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM; |
| 184 | } |
Josef Bacik | e27425d | 2011-09-27 11:01:30 -0400 | [diff] [blame] | 185 | |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 186 | btrfs_update_iflags(inode); |
| 187 | } |
| 188 | |
| 189 | static int btrfs_ioctl_getflags(struct file *file, void __user *arg) |
| 190 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 191 | struct btrfs_inode *ip = BTRFS_I(file_inode(file)); |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 192 | unsigned int flags = btrfs_flags_to_ioctl(ip->flags); |
| 193 | |
| 194 | if (copy_to_user(arg, &flags, sizeof(flags))) |
| 195 | return -EFAULT; |
| 196 | return 0; |
| 197 | } |
| 198 | |
Liu Bo | 75e7cb7 | 2011-03-22 10:12:20 +0000 | [diff] [blame] | 199 | static int check_flags(unsigned int flags) |
| 200 | { |
| 201 | if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ |
| 202 | FS_NOATIME_FL | FS_NODUMP_FL | \ |
| 203 | FS_SYNC_FL | FS_DIRSYNC_FL | \ |
Li Zefan | e1e8fb6 | 2011-04-15 03:02:49 +0000 | [diff] [blame] | 204 | FS_NOCOMP_FL | FS_COMPR_FL | |
| 205 | FS_NOCOW_FL)) |
Liu Bo | 75e7cb7 | 2011-03-22 10:12:20 +0000 | [diff] [blame] | 206 | return -EOPNOTSUPP; |
| 207 | |
| 208 | if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) |
| 209 | return -EINVAL; |
| 210 | |
Liu Bo | 75e7cb7 | 2011-03-22 10:12:20 +0000 | [diff] [blame] | 211 | return 0; |
| 212 | } |
| 213 | |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 214 | static int btrfs_ioctl_setflags(struct file *file, void __user *arg) |
| 215 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 216 | struct inode *inode = file_inode(file); |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 217 | struct btrfs_inode *ip = BTRFS_I(inode); |
| 218 | struct btrfs_root *root = ip->root; |
| 219 | struct btrfs_trans_handle *trans; |
| 220 | unsigned int flags, oldflags; |
| 221 | int ret; |
Li Zefan | f062abf | 2011-12-29 13:36:45 +0800 | [diff] [blame] | 222 | u64 ip_oldflags; |
| 223 | unsigned int i_oldflags; |
David Sterba | 7e97b8d | 2012-09-07 05:56:55 -0600 | [diff] [blame] | 224 | umode_t mode; |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 225 | |
David Sterba | bd60ea0 | 2014-01-16 15:50:22 +0100 | [diff] [blame] | 226 | if (!inode_owner_or_capable(inode)) |
| 227 | return -EPERM; |
| 228 | |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 229 | if (btrfs_root_readonly(root)) |
| 230 | return -EROFS; |
| 231 | |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 232 | if (copy_from_user(&flags, arg, sizeof(flags))) |
| 233 | return -EFAULT; |
| 234 | |
Liu Bo | 75e7cb7 | 2011-03-22 10:12:20 +0000 | [diff] [blame] | 235 | ret = check_flags(flags); |
| 236 | if (ret) |
| 237 | return ret; |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 238 | |
Jan Kara | e784868 | 2012-06-12 16:20:32 +0200 | [diff] [blame] | 239 | ret = mnt_want_write_file(file); |
| 240 | if (ret) |
| 241 | return ret; |
| 242 | |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 243 | mutex_lock(&inode->i_mutex); |
| 244 | |
Li Zefan | f062abf | 2011-12-29 13:36:45 +0800 | [diff] [blame] | 245 | ip_oldflags = ip->flags; |
| 246 | i_oldflags = inode->i_flags; |
David Sterba | 7e97b8d | 2012-09-07 05:56:55 -0600 | [diff] [blame] | 247 | mode = inode->i_mode; |
Li Zefan | f062abf | 2011-12-29 13:36:45 +0800 | [diff] [blame] | 248 | |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 249 | flags = btrfs_mask_flags(inode->i_mode, flags); |
| 250 | oldflags = btrfs_flags_to_ioctl(ip->flags); |
| 251 | if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { |
| 252 | if (!capable(CAP_LINUX_IMMUTABLE)) { |
| 253 | ret = -EPERM; |
| 254 | goto out_unlock; |
| 255 | } |
| 256 | } |
| 257 | |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 258 | if (flags & FS_SYNC_FL) |
| 259 | ip->flags |= BTRFS_INODE_SYNC; |
| 260 | else |
| 261 | ip->flags &= ~BTRFS_INODE_SYNC; |
| 262 | if (flags & FS_IMMUTABLE_FL) |
| 263 | ip->flags |= BTRFS_INODE_IMMUTABLE; |
| 264 | else |
| 265 | ip->flags &= ~BTRFS_INODE_IMMUTABLE; |
| 266 | if (flags & FS_APPEND_FL) |
| 267 | ip->flags |= BTRFS_INODE_APPEND; |
| 268 | else |
| 269 | ip->flags &= ~BTRFS_INODE_APPEND; |
| 270 | if (flags & FS_NODUMP_FL) |
| 271 | ip->flags |= BTRFS_INODE_NODUMP; |
| 272 | else |
| 273 | ip->flags &= ~BTRFS_INODE_NODUMP; |
| 274 | if (flags & FS_NOATIME_FL) |
| 275 | ip->flags |= BTRFS_INODE_NOATIME; |
| 276 | else |
| 277 | ip->flags &= ~BTRFS_INODE_NOATIME; |
| 278 | if (flags & FS_DIRSYNC_FL) |
| 279 | ip->flags |= BTRFS_INODE_DIRSYNC; |
| 280 | else |
| 281 | ip->flags &= ~BTRFS_INODE_DIRSYNC; |
David Sterba | 7e97b8d | 2012-09-07 05:56:55 -0600 | [diff] [blame] | 282 | if (flags & FS_NOCOW_FL) { |
| 283 | if (S_ISREG(mode)) { |
| 284 | /* |
| 285 | * It's safe to turn csums off here, no extents exist. |
| 286 | * Otherwise we want the flag to reflect the real COW |
| 287 | * status of the file and will not set it. |
| 288 | */ |
| 289 | if (inode->i_size == 0) |
| 290 | ip->flags |= BTRFS_INODE_NODATACOW |
| 291 | | BTRFS_INODE_NODATASUM; |
| 292 | } else { |
| 293 | ip->flags |= BTRFS_INODE_NODATACOW; |
| 294 | } |
| 295 | } else { |
| 296 | /* |
| 297 | * Revert back under same assuptions as above |
| 298 | */ |
| 299 | if (S_ISREG(mode)) { |
| 300 | if (inode->i_size == 0) |
| 301 | ip->flags &= ~(BTRFS_INODE_NODATACOW |
| 302 | | BTRFS_INODE_NODATASUM); |
| 303 | } else { |
| 304 | ip->flags &= ~BTRFS_INODE_NODATACOW; |
| 305 | } |
| 306 | } |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 307 | |
Liu Bo | 75e7cb7 | 2011-03-22 10:12:20 +0000 | [diff] [blame] | 308 | /* |
| 309 | * The COMPRESS flag can only be changed by users, while the NOCOMPRESS |
| 310 | * flag may be changed automatically if compression code won't make |
| 311 | * things smaller. |
| 312 | */ |
| 313 | if (flags & FS_NOCOMP_FL) { |
| 314 | ip->flags &= ~BTRFS_INODE_COMPRESS; |
| 315 | ip->flags |= BTRFS_INODE_NOCOMPRESS; |
Filipe David Borba Manana | 6354192 | 2014-01-07 11:47:46 +0000 | [diff] [blame] | 316 | |
| 317 | ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0); |
| 318 | if (ret && ret != -ENODATA) |
| 319 | goto out_drop; |
Liu Bo | 75e7cb7 | 2011-03-22 10:12:20 +0000 | [diff] [blame] | 320 | } else if (flags & FS_COMPR_FL) { |
Filipe David Borba Manana | 6354192 | 2014-01-07 11:47:46 +0000 | [diff] [blame] | 321 | const char *comp; |
| 322 | |
Liu Bo | 75e7cb7 | 2011-03-22 10:12:20 +0000 | [diff] [blame] | 323 | ip->flags |= BTRFS_INODE_COMPRESS; |
| 324 | ip->flags &= ~BTRFS_INODE_NOCOMPRESS; |
Filipe David Borba Manana | 6354192 | 2014-01-07 11:47:46 +0000 | [diff] [blame] | 325 | |
| 326 | if (root->fs_info->compress_type == BTRFS_COMPRESS_LZO) |
| 327 | comp = "lzo"; |
| 328 | else |
| 329 | comp = "zlib"; |
| 330 | ret = btrfs_set_prop(inode, "btrfs.compression", |
| 331 | comp, strlen(comp), 0); |
| 332 | if (ret) |
| 333 | goto out_drop; |
| 334 | |
Li Zefan | ebcb904 | 2011-04-15 03:03:17 +0000 | [diff] [blame] | 335 | } else { |
Filipe Manana | 78a017a | 2014-09-11 11:44:49 +0100 | [diff] [blame] | 336 | ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0); |
| 337 | if (ret && ret != -ENODATA) |
| 338 | goto out_drop; |
Li Zefan | ebcb904 | 2011-04-15 03:03:17 +0000 | [diff] [blame] | 339 | ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); |
Liu Bo | 75e7cb7 | 2011-03-22 10:12:20 +0000 | [diff] [blame] | 340 | } |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 341 | |
Li Zefan | 4da6f1a | 2011-12-29 13:39:50 +0800 | [diff] [blame] | 342 | trans = btrfs_start_transaction(root, 1); |
Li Zefan | f062abf | 2011-12-29 13:36:45 +0800 | [diff] [blame] | 343 | if (IS_ERR(trans)) { |
| 344 | ret = PTR_ERR(trans); |
| 345 | goto out_drop; |
| 346 | } |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 347 | |
Li Zefan | 306424cc | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 348 | btrfs_update_iflags(inode); |
Josef Bacik | 0c4d2d9 | 2012-04-05 15:03:02 -0400 | [diff] [blame] | 349 | inode_inc_iversion(inode); |
Li Zefan | 306424cc | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 350 | inode->i_ctime = CURRENT_TIME; |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 351 | ret = btrfs_update_inode(trans, root, inode); |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 352 | |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 353 | btrfs_end_transaction(trans, root); |
Li Zefan | f062abf | 2011-12-29 13:36:45 +0800 | [diff] [blame] | 354 | out_drop: |
| 355 | if (ret) { |
| 356 | ip->flags = ip_oldflags; |
| 357 | inode->i_flags = i_oldflags; |
| 358 | } |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 359 | |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 360 | out_unlock: |
| 361 | mutex_unlock(&inode->i_mutex); |
Jan Kara | e784868 | 2012-06-12 16:20:32 +0200 | [diff] [blame] | 362 | mnt_drop_write_file(file); |
liubo | 2d4e6f6 | 2011-02-24 09:38:16 +0000 | [diff] [blame] | 363 | return ret; |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 364 | } |
| 365 | |
| 366 | static int btrfs_ioctl_getversion(struct file *file, int __user *arg) |
| 367 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 368 | struct inode *inode = file_inode(file); |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 369 | |
| 370 | return put_user(inode->i_generation, arg); |
| 371 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 372 | |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 373 | static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) |
| 374 | { |
Al Viro | 54563d4 | 2013-09-01 15:57:51 -0400 | [diff] [blame] | 375 | struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 376 | struct btrfs_device *device; |
| 377 | struct request_queue *q; |
| 378 | struct fstrim_range range; |
| 379 | u64 minlen = ULLONG_MAX; |
| 380 | u64 num_devices = 0; |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 381 | u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 382 | int ret; |
| 383 | |
| 384 | if (!capable(CAP_SYS_ADMIN)) |
| 385 | return -EPERM; |
| 386 | |
Xiao Guangrong | 1f78160 | 2011-04-20 10:09:16 +0000 | [diff] [blame] | 387 | rcu_read_lock(); |
| 388 | list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, |
| 389 | dev_list) { |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 390 | if (!device->bdev) |
| 391 | continue; |
| 392 | q = bdev_get_queue(device->bdev); |
| 393 | if (blk_queue_discard(q)) { |
| 394 | num_devices++; |
| 395 | minlen = min((u64)q->limits.discard_granularity, |
| 396 | minlen); |
| 397 | } |
| 398 | } |
Xiao Guangrong | 1f78160 | 2011-04-20 10:09:16 +0000 | [diff] [blame] | 399 | rcu_read_unlock(); |
Lukas Czerner | f4c697e | 2011-09-05 16:34:54 +0200 | [diff] [blame] | 400 | |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 401 | if (!num_devices) |
| 402 | return -EOPNOTSUPP; |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 403 | if (copy_from_user(&range, arg, sizeof(range))) |
| 404 | return -EFAULT; |
Lukas Czerner | e515c18 | 2012-10-16 09:34:36 +0000 | [diff] [blame] | 405 | if (range.start > total_bytes || |
| 406 | range.len < fs_info->sb->s_blocksize) |
Lukas Czerner | f4c697e | 2011-09-05 16:34:54 +0200 | [diff] [blame] | 407 | return -EINVAL; |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 408 | |
Lukas Czerner | f4c697e | 2011-09-05 16:34:54 +0200 | [diff] [blame] | 409 | range.len = min(range.len, total_bytes - range.start); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 410 | range.minlen = max(range.minlen, minlen); |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 411 | ret = btrfs_trim_fs(fs_info->tree_root, &range); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 412 | if (ret < 0) |
| 413 | return ret; |
| 414 | |
| 415 | if (copy_to_user(arg, &range, sizeof(range))) |
| 416 | return -EFAULT; |
| 417 | |
| 418 | return 0; |
| 419 | } |
| 420 | |
Stefan Behrens | dd5f961 | 2013-08-15 17:11:20 +0200 | [diff] [blame] | 421 | int btrfs_is_empty_uuid(u8 *uuid) |
| 422 | { |
Chris Mason | 46e0f66 | 2013-11-15 12:14:55 +0100 | [diff] [blame] | 423 | int i; |
| 424 | |
| 425 | for (i = 0; i < BTRFS_UUID_SIZE; i++) { |
| 426 | if (uuid[i]) |
| 427 | return 0; |
| 428 | } |
| 429 | return 1; |
Stefan Behrens | dd5f961 | 2013-08-15 17:11:20 +0200 | [diff] [blame] | 430 | } |
| 431 | |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 432 | static noinline int create_subvol(struct inode *dir, |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 433 | struct dentry *dentry, |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 434 | char *name, int namelen, |
Arne Jansen | 6f72c7e | 2011-09-14 15:58:21 +0200 | [diff] [blame] | 435 | u64 *async_transid, |
Miao Xie | 8696c53 | 2013-02-07 06:02:44 +0000 | [diff] [blame] | 436 | struct btrfs_qgroup_inherit *inherit) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 437 | { |
| 438 | struct btrfs_trans_handle *trans; |
| 439 | struct btrfs_key key; |
| 440 | struct btrfs_root_item root_item; |
| 441 | struct btrfs_inode_item *inode_item; |
| 442 | struct extent_buffer *leaf; |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 443 | struct btrfs_root *root = BTRFS_I(dir)->root; |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 444 | struct btrfs_root *new_root; |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 445 | struct btrfs_block_rsv block_rsv; |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 446 | struct timespec cur_time = CURRENT_TIME; |
Tsutomu Itoh | 5662344b3 | 2013-12-13 09:51:42 +0900 | [diff] [blame] | 447 | struct inode *inode; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 448 | int ret; |
| 449 | int err; |
| 450 | u64 objectid; |
| 451 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 452 | u64 index = 0; |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 453 | u64 qgroup_reserved; |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 454 | uuid_le new_uuid; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 455 | |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 456 | ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid); |
Al Viro | 2fbe8c8 | 2011-07-16 21:38:06 -0400 | [diff] [blame] | 457 | if (ret) |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 458 | return ret; |
Josef Bacik | 6a91221 | 2010-11-20 09:48:00 +0000 | [diff] [blame] | 459 | |
Qu Wenruo | e09fe2d | 2015-02-27 16:24:23 +0800 | [diff] [blame] | 460 | /* |
| 461 | * Don't create subvolume whose level is not zero. Or qgroup will be |
| 462 | * screwed up since it assume subvolme qgroup's level to be 0. |
| 463 | */ |
| 464 | if (btrfs_qgroup_level(objectid)) |
| 465 | return -ENOSPC; |
| 466 | |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 467 | btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 468 | /* |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 469 | * The same as the snapshot creation, please see the comment |
| 470 | * of create_snapshot(). |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 471 | */ |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 472 | ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, |
Stefan Behrens | dd5f961 | 2013-08-15 17:11:20 +0200 | [diff] [blame] | 473 | 8, &qgroup_reserved, false); |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 474 | if (ret) |
| 475 | return ret; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 476 | |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 477 | trans = btrfs_start_transaction(root, 0); |
| 478 | if (IS_ERR(trans)) { |
| 479 | ret = PTR_ERR(trans); |
Liu Bo | de6e820 | 2014-01-09 14:57:06 +0800 | [diff] [blame] | 480 | btrfs_subvolume_release_metadata(root, &block_rsv, |
| 481 | qgroup_reserved); |
| 482 | return ret; |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 483 | } |
| 484 | trans->block_rsv = &block_rsv; |
| 485 | trans->bytes_reserved = block_rsv.size; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 486 | |
Miao Xie | 8696c53 | 2013-02-07 06:02:44 +0000 | [diff] [blame] | 487 | ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit); |
Arne Jansen | 6f72c7e | 2011-09-14 15:58:21 +0200 | [diff] [blame] | 488 | if (ret) |
| 489 | goto fail; |
| 490 | |
David Sterba | 4d75f8a | 2014-06-15 01:54:12 +0200 | [diff] [blame] | 491 | leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0); |
Josef Bacik | 8e8a1e3 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 492 | if (IS_ERR(leaf)) { |
| 493 | ret = PTR_ERR(leaf); |
| 494 | goto fail; |
| 495 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 496 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 497 | memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 498 | btrfs_set_header_bytenr(leaf, leaf->start); |
| 499 | btrfs_set_header_generation(leaf, trans->transid); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 500 | btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 501 | btrfs_set_header_owner(leaf, objectid); |
| 502 | |
Ross Kirk | 0a4e558 | 2013-09-24 10:12:38 +0100 | [diff] [blame] | 503 | write_extent_buffer(leaf, root->fs_info->fsid, btrfs_header_fsid(), |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 504 | BTRFS_FSID_SIZE); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 505 | write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, |
Geert Uytterhoeven | b308bc2 | 2013-08-20 13:20:15 +0200 | [diff] [blame] | 506 | btrfs_header_chunk_tree_uuid(leaf), |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 507 | BTRFS_UUID_SIZE); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 508 | btrfs_mark_buffer_dirty(leaf); |
| 509 | |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 510 | memset(&root_item, 0, sizeof(root_item)); |
| 511 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 512 | inode_item = &root_item.inode; |
Qu Wenruo | 3cae210 | 2013-07-16 11:19:18 +0800 | [diff] [blame] | 513 | btrfs_set_stack_inode_generation(inode_item, 1); |
| 514 | btrfs_set_stack_inode_size(inode_item, 3); |
| 515 | btrfs_set_stack_inode_nlink(inode_item, 1); |
David Sterba | 707e8a0 | 2014-06-04 19:22:26 +0200 | [diff] [blame] | 516 | btrfs_set_stack_inode_nbytes(inode_item, root->nodesize); |
Qu Wenruo | 3cae210 | 2013-07-16 11:19:18 +0800 | [diff] [blame] | 517 | btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 518 | |
Qu Wenruo | 3cae210 | 2013-07-16 11:19:18 +0800 | [diff] [blame] | 519 | btrfs_set_root_flags(&root_item, 0); |
| 520 | btrfs_set_root_limit(&root_item, 0); |
| 521 | btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); |
Li Zefan | 08fe4db | 2011-03-28 02:01:25 +0000 | [diff] [blame] | 522 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 523 | btrfs_set_root_bytenr(&root_item, leaf->start); |
Yan Zheng | 84234f3 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 524 | btrfs_set_root_generation(&root_item, trans->transid); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 525 | btrfs_set_root_level(&root_item, 0); |
| 526 | btrfs_set_root_refs(&root_item, 1); |
Yan, Zheng | 86b9f2e | 2009-11-12 09:36:50 +0000 | [diff] [blame] | 527 | btrfs_set_root_used(&root_item, leaf->len); |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 528 | btrfs_set_root_last_snapshot(&root_item, 0); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 529 | |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 530 | btrfs_set_root_generation_v2(&root_item, |
| 531 | btrfs_root_generation(&root_item)); |
| 532 | uuid_le_gen(&new_uuid); |
| 533 | memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE); |
Qu Wenruo | 3cae210 | 2013-07-16 11:19:18 +0800 | [diff] [blame] | 534 | btrfs_set_stack_timespec_sec(&root_item.otime, cur_time.tv_sec); |
| 535 | btrfs_set_stack_timespec_nsec(&root_item.otime, cur_time.tv_nsec); |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 536 | root_item.ctime = root_item.otime; |
| 537 | btrfs_set_root_ctransid(&root_item, trans->transid); |
| 538 | btrfs_set_root_otransid(&root_item, trans->transid); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 539 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 540 | btrfs_tree_unlock(leaf); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 541 | free_extent_buffer(leaf); |
| 542 | leaf = NULL; |
| 543 | |
| 544 | btrfs_set_root_dirid(&root_item, new_dirid); |
| 545 | |
| 546 | key.objectid = objectid; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 547 | key.offset = 0; |
David Sterba | 962a298 | 2014-06-04 18:41:45 +0200 | [diff] [blame] | 548 | key.type = BTRFS_ROOT_ITEM_KEY; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 549 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, |
| 550 | &root_item); |
| 551 | if (ret) |
| 552 | goto fail; |
| 553 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 554 | key.offset = (u64)-1; |
| 555 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 556 | if (IS_ERR(new_root)) { |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 557 | ret = PTR_ERR(new_root); |
David Sterba | 6d13f54 | 2015-04-24 19:12:01 +0200 | [diff] [blame] | 558 | btrfs_abort_transaction(trans, root, ret); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 559 | goto fail; |
| 560 | } |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 561 | |
| 562 | btrfs_record_root_in_trans(trans, new_root); |
| 563 | |
Filipe David Borba Manana | 6354192 | 2014-01-07 11:47:46 +0000 | [diff] [blame] | 564 | ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid); |
Mark Fasheh | ce59897 | 2011-07-26 11:32:23 -0700 | [diff] [blame] | 565 | if (ret) { |
| 566 | /* We potentially lose an unused inode item here */ |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 567 | btrfs_abort_transaction(trans, root, ret); |
Mark Fasheh | ce59897 | 2011-07-26 11:32:23 -0700 | [diff] [blame] | 568 | goto fail; |
| 569 | } |
| 570 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 571 | /* |
| 572 | * insert the directory item |
| 573 | */ |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 574 | ret = btrfs_set_inode_index(dir, &index); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 575 | if (ret) { |
| 576 | btrfs_abort_transaction(trans, root, ret); |
| 577 | goto fail; |
| 578 | } |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 579 | |
| 580 | ret = btrfs_insert_dir_item(trans, root, |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 581 | name, namelen, dir, &key, |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 582 | BTRFS_FT_DIR, index); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 583 | if (ret) { |
| 584 | btrfs_abort_transaction(trans, root, ret); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 585 | goto fail; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 586 | } |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 587 | |
Yan Zheng | 52c2617 | 2009-01-05 15:43:43 -0500 | [diff] [blame] | 588 | btrfs_i_size_write(dir, dir->i_size + namelen * 2); |
| 589 | ret = btrfs_update_inode(trans, root, dir); |
| 590 | BUG_ON(ret); |
| 591 | |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 592 | ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 593 | objectid, root->root_key.objectid, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 594 | btrfs_ino(dir), index, name, namelen); |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 595 | BUG_ON(ret); |
| 596 | |
Stefan Behrens | dd5f961 | 2013-08-15 17:11:20 +0200 | [diff] [blame] | 597 | ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, |
| 598 | root_item.uuid, BTRFS_UUID_KEY_SUBVOL, |
| 599 | objectid); |
| 600 | if (ret) |
| 601 | btrfs_abort_transaction(trans, root, ret); |
| 602 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 603 | fail: |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 604 | trans->block_rsv = NULL; |
| 605 | trans->bytes_reserved = 0; |
Liu Bo | de6e820 | 2014-01-09 14:57:06 +0800 | [diff] [blame] | 606 | btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); |
| 607 | |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 608 | if (async_transid) { |
| 609 | *async_transid = trans->transid; |
| 610 | err = btrfs_commit_transaction_async(trans, root, 1); |
Miao Xie | 00d71c9 | 2013-03-04 09:45:06 +0000 | [diff] [blame] | 611 | if (err) |
| 612 | err = btrfs_commit_transaction(trans, root); |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 613 | } else { |
| 614 | err = btrfs_commit_transaction(trans, root); |
| 615 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 616 | if (err && !ret) |
| 617 | ret = err; |
Chris Mason | 1a65e24 | 2013-02-06 12:06:02 -0500 | [diff] [blame] | 618 | |
Tsutomu Itoh | 5662344b3 | 2013-12-13 09:51:42 +0900 | [diff] [blame] | 619 | if (!ret) { |
| 620 | inode = btrfs_lookup_dentry(dir, dentry); |
Liu Bo | de6e820 | 2014-01-09 14:57:06 +0800 | [diff] [blame] | 621 | if (IS_ERR(inode)) |
| 622 | return PTR_ERR(inode); |
Tsutomu Itoh | 5662344b3 | 2013-12-13 09:51:42 +0900 | [diff] [blame] | 623 | d_instantiate(dentry, inode); |
| 624 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 625 | return ret; |
| 626 | } |
| 627 | |
Filipe Manana | 9ea24bb | 2014-10-29 11:57:59 +0000 | [diff] [blame] | 628 | static void btrfs_wait_for_no_snapshoting_writes(struct btrfs_root *root) |
Miao Xie | 8257b2d | 2014-03-06 13:38:19 +0800 | [diff] [blame] | 629 | { |
| 630 | s64 writers; |
| 631 | DEFINE_WAIT(wait); |
| 632 | |
| 633 | do { |
| 634 | prepare_to_wait(&root->subv_writers->wait, &wait, |
| 635 | TASK_UNINTERRUPTIBLE); |
| 636 | |
| 637 | writers = percpu_counter_sum(&root->subv_writers->counter); |
| 638 | if (writers) |
| 639 | schedule(); |
| 640 | |
| 641 | finish_wait(&root->subv_writers->wait, &wait); |
| 642 | } while (writers); |
| 643 | } |
| 644 | |
Miao Xie | e9662f7 | 2013-02-28 10:01:15 +0000 | [diff] [blame] | 645 | static int create_snapshot(struct btrfs_root *root, struct inode *dir, |
| 646 | struct dentry *dentry, char *name, int namelen, |
| 647 | u64 *async_transid, bool readonly, |
| 648 | struct btrfs_qgroup_inherit *inherit) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 649 | { |
Yan, Zheng | 2e4bfab | 2009-11-12 09:37:02 +0000 | [diff] [blame] | 650 | struct inode *inode; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 651 | struct btrfs_pending_snapshot *pending_snapshot; |
| 652 | struct btrfs_trans_handle *trans; |
Yan, Zheng | 2e4bfab | 2009-11-12 09:37:02 +0000 | [diff] [blame] | 653 | int ret; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 654 | |
Miao Xie | 27cdeb7 | 2014-04-02 19:51:05 +0800 | [diff] [blame] | 655 | if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state)) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 656 | return -EINVAL; |
| 657 | |
Miao Xie | 8257b2d | 2014-03-06 13:38:19 +0800 | [diff] [blame] | 658 | atomic_inc(&root->will_be_snapshoted); |
Peter Zijlstra | 4e857c5 | 2014-03-17 18:06:10 +0100 | [diff] [blame] | 659 | smp_mb__after_atomic(); |
Filipe Manana | 9ea24bb | 2014-10-29 11:57:59 +0000 | [diff] [blame] | 660 | btrfs_wait_for_no_snapshoting_writes(root); |
Miao Xie | 8257b2d | 2014-03-06 13:38:19 +0800 | [diff] [blame] | 661 | |
Miao Xie | 6a03843 | 2013-05-15 07:48:24 +0000 | [diff] [blame] | 662 | ret = btrfs_start_delalloc_inodes(root, 0); |
| 663 | if (ret) |
Miao Xie | 8257b2d | 2014-03-06 13:38:19 +0800 | [diff] [blame] | 664 | goto out; |
Miao Xie | 6a03843 | 2013-05-15 07:48:24 +0000 | [diff] [blame] | 665 | |
Miao Xie | b024419 | 2013-11-04 23:13:25 +0800 | [diff] [blame] | 666 | btrfs_wait_ordered_extents(root, -1); |
Miao Xie | 6a03843 | 2013-05-15 07:48:24 +0000 | [diff] [blame] | 667 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 668 | pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); |
Miao Xie | 8257b2d | 2014-03-06 13:38:19 +0800 | [diff] [blame] | 669 | if (!pending_snapshot) { |
| 670 | ret = -ENOMEM; |
| 671 | goto out; |
| 672 | } |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 673 | |
Miao Xie | 66d8f3d | 2012-09-06 04:02:28 -0600 | [diff] [blame] | 674 | btrfs_init_block_rsv(&pending_snapshot->block_rsv, |
| 675 | BTRFS_BLOCK_RSV_TEMP); |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 676 | /* |
| 677 | * 1 - parent dir inode |
| 678 | * 2 - dir entries |
| 679 | * 1 - root item |
| 680 | * 2 - root ref/backref |
| 681 | * 1 - root of snapshot |
Stefan Behrens | dd5f961 | 2013-08-15 17:11:20 +0200 | [diff] [blame] | 682 | * 1 - UUID item |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 683 | */ |
| 684 | ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, |
Stefan Behrens | dd5f961 | 2013-08-15 17:11:20 +0200 | [diff] [blame] | 685 | &pending_snapshot->block_rsv, 8, |
Jeff Mahoney | ee3441b | 2013-07-09 16:37:21 -0400 | [diff] [blame] | 686 | &pending_snapshot->qgroup_reserved, |
| 687 | false); |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 688 | if (ret) |
Miao Xie | 8257b2d | 2014-03-06 13:38:19 +0800 | [diff] [blame] | 689 | goto free; |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 690 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 691 | pending_snapshot->dentry = dentry; |
| 692 | pending_snapshot->root = root; |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 693 | pending_snapshot->readonly = readonly; |
Miao Xie | e9662f7 | 2013-02-28 10:01:15 +0000 | [diff] [blame] | 694 | pending_snapshot->dir = dir; |
Miao Xie | 8696c53 | 2013-02-07 06:02:44 +0000 | [diff] [blame] | 695 | pending_snapshot->inherit = inherit; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 696 | |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 697 | trans = btrfs_start_transaction(root, 0); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 698 | if (IS_ERR(trans)) { |
| 699 | ret = PTR_ERR(trans); |
| 700 | goto fail; |
| 701 | } |
| 702 | |
Josef Bacik | 8351583 | 2011-06-14 15:16:14 -0400 | [diff] [blame] | 703 | spin_lock(&root->fs_info->trans_lock); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 704 | list_add(&pending_snapshot->list, |
| 705 | &trans->transaction->pending_snapshots); |
Josef Bacik | 8351583 | 2011-06-14 15:16:14 -0400 | [diff] [blame] | 706 | spin_unlock(&root->fs_info->trans_lock); |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 707 | if (async_transid) { |
| 708 | *async_transid = trans->transid; |
| 709 | ret = btrfs_commit_transaction_async(trans, |
| 710 | root->fs_info->extent_root, 1); |
Miao Xie | 00d71c9 | 2013-03-04 09:45:06 +0000 | [diff] [blame] | 711 | if (ret) |
| 712 | ret = btrfs_commit_transaction(trans, root); |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 713 | } else { |
| 714 | ret = btrfs_commit_transaction(trans, |
| 715 | root->fs_info->extent_root); |
| 716 | } |
Miao Xie | aec8030 | 2013-03-04 09:44:29 +0000 | [diff] [blame] | 717 | if (ret) |
Josef Bacik | c37b2b6 | 2012-10-22 15:51:44 -0400 | [diff] [blame] | 718 | goto fail; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 719 | |
| 720 | ret = pending_snapshot->error; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 721 | if (ret) |
Yan, Zheng | 2e4bfab | 2009-11-12 09:37:02 +0000 | [diff] [blame] | 722 | goto fail; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 723 | |
Chris Mason | d379730 | 2014-10-15 13:50:56 -0700 | [diff] [blame] | 724 | ret = btrfs_orphan_cleanup(pending_snapshot->snap); |
| 725 | if (ret) |
| 726 | goto fail; |
| 727 | |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 728 | inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); |
Yan, Zheng | 2e4bfab | 2009-11-12 09:37:02 +0000 | [diff] [blame] | 729 | if (IS_ERR(inode)) { |
| 730 | ret = PTR_ERR(inode); |
| 731 | goto fail; |
| 732 | } |
Tsutomu Itoh | 5662344b3 | 2013-12-13 09:51:42 +0900 | [diff] [blame] | 733 | |
Yan, Zheng | 2e4bfab | 2009-11-12 09:37:02 +0000 | [diff] [blame] | 734 | d_instantiate(dentry, inode); |
| 735 | ret = 0; |
| 736 | fail: |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 737 | btrfs_subvolume_release_metadata(BTRFS_I(dir)->root, |
| 738 | &pending_snapshot->block_rsv, |
| 739 | pending_snapshot->qgroup_reserved); |
Miao Xie | 8257b2d | 2014-03-06 13:38:19 +0800 | [diff] [blame] | 740 | free: |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 741 | kfree(pending_snapshot); |
Miao Xie | 8257b2d | 2014-03-06 13:38:19 +0800 | [diff] [blame] | 742 | out: |
Filipe Manana | 9ea24bb | 2014-10-29 11:57:59 +0000 | [diff] [blame] | 743 | if (atomic_dec_and_test(&root->will_be_snapshoted)) |
| 744 | wake_up_atomic_t(&root->will_be_snapshoted); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 745 | return ret; |
| 746 | } |
| 747 | |
Sage Weil | 4260f7c | 2010-10-29 15:46:43 -0400 | [diff] [blame] | 748 | /* copy of may_delete in fs/namei.c() |
| 749 | * Check whether we can remove a link victim from directory dir, check |
| 750 | * whether the type of victim is right. |
| 751 | * 1. We can't do it if dir is read-only (done in permission()) |
| 752 | * 2. We should have write and exec permissions on dir |
| 753 | * 3. We can't remove anything from append-only dir |
| 754 | * 4. We can't do anything with immutable dir (done in permission()) |
| 755 | * 5. If the sticky bit on dir is set we should either |
| 756 | * a. be owner of dir, or |
| 757 | * b. be owner of victim, or |
| 758 | * c. have CAP_FOWNER capability |
| 759 | * 6. If the victim is append-only or immutable we can't do antyhing with |
| 760 | * links pointing to it. |
| 761 | * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. |
| 762 | * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. |
| 763 | * 9. We can't remove a root or mountpoint. |
| 764 | * 10. We don't allow removal of NFS sillyrenamed files; it's handled by |
| 765 | * nfs_async_unlink(). |
| 766 | */ |
| 767 | |
Dulshani Gunawardhana | 6787125 | 2013-10-31 10:33:04 +0530 | [diff] [blame] | 768 | static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir) |
Sage Weil | 4260f7c | 2010-10-29 15:46:43 -0400 | [diff] [blame] | 769 | { |
| 770 | int error; |
| 771 | |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 772 | if (d_really_is_negative(victim)) |
Sage Weil | 4260f7c | 2010-10-29 15:46:43 -0400 | [diff] [blame] | 773 | return -ENOENT; |
| 774 | |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 775 | BUG_ON(d_inode(victim->d_parent) != dir); |
Jeff Layton | 4fa6b5e | 2012-10-10 15:25:25 -0400 | [diff] [blame] | 776 | audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); |
Sage Weil | 4260f7c | 2010-10-29 15:46:43 -0400 | [diff] [blame] | 777 | |
| 778 | error = inode_permission(dir, MAY_WRITE | MAY_EXEC); |
| 779 | if (error) |
| 780 | return error; |
| 781 | if (IS_APPEND(dir)) |
| 782 | return -EPERM; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 783 | if (check_sticky(dir, d_inode(victim)) || IS_APPEND(d_inode(victim)) || |
| 784 | IS_IMMUTABLE(d_inode(victim)) || IS_SWAPFILE(d_inode(victim))) |
Sage Weil | 4260f7c | 2010-10-29 15:46:43 -0400 | [diff] [blame] | 785 | return -EPERM; |
| 786 | if (isdir) { |
David Howells | e36cb0b | 2015-01-29 12:02:35 +0000 | [diff] [blame] | 787 | if (!d_is_dir(victim)) |
Sage Weil | 4260f7c | 2010-10-29 15:46:43 -0400 | [diff] [blame] | 788 | return -ENOTDIR; |
| 789 | if (IS_ROOT(victim)) |
| 790 | return -EBUSY; |
David Howells | e36cb0b | 2015-01-29 12:02:35 +0000 | [diff] [blame] | 791 | } else if (d_is_dir(victim)) |
Sage Weil | 4260f7c | 2010-10-29 15:46:43 -0400 | [diff] [blame] | 792 | return -EISDIR; |
| 793 | if (IS_DEADDIR(dir)) |
| 794 | return -ENOENT; |
| 795 | if (victim->d_flags & DCACHE_NFSFS_RENAMED) |
| 796 | return -EBUSY; |
| 797 | return 0; |
| 798 | } |
| 799 | |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 800 | /* copy of may_create in fs/namei.c() */ |
| 801 | static inline int btrfs_may_create(struct inode *dir, struct dentry *child) |
| 802 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 803 | if (d_really_is_positive(child)) |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 804 | return -EEXIST; |
| 805 | if (IS_DEADDIR(dir)) |
| 806 | return -ENOENT; |
| 807 | return inode_permission(dir, MAY_WRITE | MAY_EXEC); |
| 808 | } |
| 809 | |
| 810 | /* |
| 811 | * Create a new subvolume below @parent. This is largely modeled after |
| 812 | * sys_mkdirat and vfs_mkdir, but we only do a single component lookup |
| 813 | * inside this filesystem so it's quite a bit simpler. |
| 814 | */ |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 815 | static noinline int btrfs_mksubvol(struct path *parent, |
| 816 | char *name, int namelen, |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 817 | struct btrfs_root *snap_src, |
Arne Jansen | 6f72c7e | 2011-09-14 15:58:21 +0200 | [diff] [blame] | 818 | u64 *async_transid, bool readonly, |
Miao Xie | 8696c53 | 2013-02-07 06:02:44 +0000 | [diff] [blame] | 819 | struct btrfs_qgroup_inherit *inherit) |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 820 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 821 | struct inode *dir = d_inode(parent->dentry); |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 822 | struct dentry *dentry; |
| 823 | int error; |
| 824 | |
David Sterba | 5c50c9b | 2013-03-22 18:12:51 +0000 | [diff] [blame] | 825 | error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); |
| 826 | if (error == -EINTR) |
| 827 | return error; |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 828 | |
| 829 | dentry = lookup_one_len(name, parent->dentry, namelen); |
| 830 | error = PTR_ERR(dentry); |
| 831 | if (IS_ERR(dentry)) |
| 832 | goto out_unlock; |
| 833 | |
| 834 | error = -EEXIST; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 835 | if (d_really_is_positive(dentry)) |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 836 | goto out_dput; |
| 837 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 838 | error = btrfs_may_create(dir, dentry); |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 839 | if (error) |
Liu Bo | a874a63 | 2012-06-29 03:58:46 -0600 | [diff] [blame] | 840 | goto out_dput; |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 841 | |
Chris Mason | 9c52057 | 2012-12-17 14:26:57 -0500 | [diff] [blame] | 842 | /* |
| 843 | * even if this name doesn't exist, we may get hash collisions. |
| 844 | * check for them now when we can safely fail |
| 845 | */ |
| 846 | error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, |
| 847 | dir->i_ino, name, |
| 848 | namelen); |
| 849 | if (error) |
| 850 | goto out_dput; |
| 851 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 852 | down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); |
| 853 | |
| 854 | if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) |
| 855 | goto out_up_read; |
| 856 | |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 857 | if (snap_src) { |
Miao Xie | e9662f7 | 2013-02-28 10:01:15 +0000 | [diff] [blame] | 858 | error = create_snapshot(snap_src, dir, dentry, name, namelen, |
Arne Jansen | 6f72c7e | 2011-09-14 15:58:21 +0200 | [diff] [blame] | 859 | async_transid, readonly, inherit); |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 860 | } else { |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 861 | error = create_subvol(dir, dentry, name, namelen, |
| 862 | async_transid, inherit); |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 863 | } |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 864 | if (!error) |
| 865 | fsnotify_mkdir(dir, dentry); |
| 866 | out_up_read: |
| 867 | up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 868 | out_dput: |
| 869 | dput(dentry); |
| 870 | out_unlock: |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 871 | mutex_unlock(&dir->i_mutex); |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 872 | return error; |
| 873 | } |
| 874 | |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 875 | /* |
| 876 | * When we're defragging a range, we don't want to kick it off again |
| 877 | * if it is really just waiting for delalloc to send it down. |
| 878 | * If we find a nice big extent or delalloc range for the bytes in the |
| 879 | * file you want to defrag, we return 0 to let you know to skip this |
| 880 | * part of the file |
| 881 | */ |
David Sterba | aab110a | 2014-07-29 17:32:10 +0200 | [diff] [blame] | 882 | static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh) |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 883 | { |
| 884 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
| 885 | struct extent_map *em = NULL; |
| 886 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
| 887 | u64 end; |
| 888 | |
| 889 | read_lock(&em_tree->lock); |
| 890 | em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); |
| 891 | read_unlock(&em_tree->lock); |
| 892 | |
| 893 | if (em) { |
| 894 | end = extent_map_end(em); |
| 895 | free_extent_map(em); |
| 896 | if (end - offset > thresh) |
| 897 | return 0; |
| 898 | } |
| 899 | /* if we already have a nice delalloc here, just stop */ |
| 900 | thresh /= 2; |
| 901 | end = count_range_bits(io_tree, &offset, offset + thresh, |
| 902 | thresh, EXTENT_DELALLOC, 1); |
| 903 | if (end >= thresh) |
| 904 | return 0; |
| 905 | return 1; |
| 906 | } |
| 907 | |
| 908 | /* |
| 909 | * helper function to walk through a file and find extents |
| 910 | * newer than a specific transid, and smaller than thresh. |
| 911 | * |
| 912 | * This is used by the defragging code to find new and small |
| 913 | * extents |
| 914 | */ |
| 915 | static int find_new_extents(struct btrfs_root *root, |
| 916 | struct inode *inode, u64 newer_than, |
David Sterba | aab110a | 2014-07-29 17:32:10 +0200 | [diff] [blame] | 917 | u64 *off, u32 thresh) |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 918 | { |
| 919 | struct btrfs_path *path; |
| 920 | struct btrfs_key min_key; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 921 | struct extent_buffer *leaf; |
| 922 | struct btrfs_file_extent_item *extent; |
| 923 | int type; |
| 924 | int ret; |
David Sterba | a4689d2 | 2011-05-31 17:08:14 +0000 | [diff] [blame] | 925 | u64 ino = btrfs_ino(inode); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 926 | |
| 927 | path = btrfs_alloc_path(); |
| 928 | if (!path) |
| 929 | return -ENOMEM; |
| 930 | |
David Sterba | a4689d2 | 2011-05-31 17:08:14 +0000 | [diff] [blame] | 931 | min_key.objectid = ino; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 932 | min_key.type = BTRFS_EXTENT_DATA_KEY; |
| 933 | min_key.offset = *off; |
| 934 | |
Dulshani Gunawardhana | 6787125 | 2013-10-31 10:33:04 +0530 | [diff] [blame] | 935 | while (1) { |
Filipe David Borba Manana | 6174d3c | 2013-10-01 16:13:42 +0100 | [diff] [blame] | 936 | ret = btrfs_search_forward(root, &min_key, path, newer_than); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 937 | if (ret != 0) |
| 938 | goto none; |
Filipe Manana | f094c9bd | 2014-03-12 01:28:24 +0000 | [diff] [blame] | 939 | process_slot: |
David Sterba | a4689d2 | 2011-05-31 17:08:14 +0000 | [diff] [blame] | 940 | if (min_key.objectid != ino) |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 941 | goto none; |
| 942 | if (min_key.type != BTRFS_EXTENT_DATA_KEY) |
| 943 | goto none; |
| 944 | |
| 945 | leaf = path->nodes[0]; |
| 946 | extent = btrfs_item_ptr(leaf, path->slots[0], |
| 947 | struct btrfs_file_extent_item); |
| 948 | |
| 949 | type = btrfs_file_extent_type(leaf, extent); |
| 950 | if (type == BTRFS_FILE_EXTENT_REG && |
| 951 | btrfs_file_extent_num_bytes(leaf, extent) < thresh && |
| 952 | check_defrag_in_cache(inode, min_key.offset, thresh)) { |
| 953 | *off = min_key.offset; |
| 954 | btrfs_free_path(path); |
| 955 | return 0; |
| 956 | } |
| 957 | |
Filipe Manana | f094c9bd | 2014-03-12 01:28:24 +0000 | [diff] [blame] | 958 | path->slots[0]++; |
| 959 | if (path->slots[0] < btrfs_header_nritems(leaf)) { |
| 960 | btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]); |
| 961 | goto process_slot; |
| 962 | } |
| 963 | |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 964 | if (min_key.offset == (u64)-1) |
| 965 | goto none; |
| 966 | |
| 967 | min_key.offset++; |
| 968 | btrfs_release_path(path); |
| 969 | } |
| 970 | none: |
| 971 | btrfs_free_path(path); |
| 972 | return -ENOENT; |
| 973 | } |
| 974 | |
Li Zefan | 6c282eb | 2012-06-11 16:03:35 +0800 | [diff] [blame] | 975 | static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) |
Liu Bo | 17ce6ef | 2012-03-29 09:57:45 -0400 | [diff] [blame] | 976 | { |
| 977 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 978 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
Li Zefan | 6c282eb | 2012-06-11 16:03:35 +0800 | [diff] [blame] | 979 | struct extent_map *em; |
| 980 | u64 len = PAGE_CACHE_SIZE; |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 981 | |
| 982 | /* |
| 983 | * hopefully we have this extent in the tree already, try without |
| 984 | * the full extent lock |
| 985 | */ |
| 986 | read_lock(&em_tree->lock); |
| 987 | em = lookup_extent_mapping(em_tree, start, len); |
| 988 | read_unlock(&em_tree->lock); |
| 989 | |
| 990 | if (!em) { |
Filipe Manana | 308d980 | 2014-03-11 13:56:15 +0000 | [diff] [blame] | 991 | struct extent_state *cached = NULL; |
| 992 | u64 end = start + len - 1; |
| 993 | |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 994 | /* get the big lock and read metadata off disk */ |
Filipe Manana | 308d980 | 2014-03-11 13:56:15 +0000 | [diff] [blame] | 995 | lock_extent_bits(io_tree, start, end, 0, &cached); |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 996 | em = btrfs_get_extent(inode, NULL, 0, start, len, 0); |
Filipe Manana | 308d980 | 2014-03-11 13:56:15 +0000 | [diff] [blame] | 997 | unlock_extent_cached(io_tree, start, end, &cached, GFP_NOFS); |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 998 | |
Dan Carpenter | 6cf8bfb | 2010-03-20 11:22:10 +0000 | [diff] [blame] | 999 | if (IS_ERR(em)) |
Li Zefan | 6c282eb | 2012-06-11 16:03:35 +0800 | [diff] [blame] | 1000 | return NULL; |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 1001 | } |
| 1002 | |
Li Zefan | 6c282eb | 2012-06-11 16:03:35 +0800 | [diff] [blame] | 1003 | return em; |
| 1004 | } |
| 1005 | |
| 1006 | static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) |
| 1007 | { |
| 1008 | struct extent_map *next; |
| 1009 | bool ret = true; |
| 1010 | |
| 1011 | /* this is the last extent */ |
| 1012 | if (em->start + em->len >= i_size_read(inode)) |
| 1013 | return false; |
| 1014 | |
| 1015 | next = defrag_lookup_extent(inode, em->start + em->len); |
Chris Mason | e9512d7 | 2014-08-26 13:55:54 -0700 | [diff] [blame] | 1016 | if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) |
| 1017 | ret = false; |
| 1018 | else if ((em->block_start + em->block_len == next->block_start) && |
| 1019 | (em->block_len > 128 * 1024 && next->block_len > 128 * 1024)) |
Li Zefan | 6c282eb | 2012-06-11 16:03:35 +0800 | [diff] [blame] | 1020 | ret = false; |
| 1021 | |
| 1022 | free_extent_map(next); |
| 1023 | return ret; |
| 1024 | } |
| 1025 | |
David Sterba | aab110a | 2014-07-29 17:32:10 +0200 | [diff] [blame] | 1026 | static int should_defrag_range(struct inode *inode, u64 start, u32 thresh, |
Andrew Mahone | a43a211 | 2012-06-19 21:08:32 -0400 | [diff] [blame] | 1027 | u64 *last_len, u64 *skip, u64 *defrag_end, |
| 1028 | int compress) |
Li Zefan | 6c282eb | 2012-06-11 16:03:35 +0800 | [diff] [blame] | 1029 | { |
| 1030 | struct extent_map *em; |
| 1031 | int ret = 1; |
| 1032 | bool next_mergeable = true; |
Liu Bo | 4a3560c | 2015-08-07 16:48:41 +0800 | [diff] [blame] | 1033 | bool prev_mergeable = true; |
Li Zefan | 6c282eb | 2012-06-11 16:03:35 +0800 | [diff] [blame] | 1034 | |
| 1035 | /* |
| 1036 | * make sure that once we start defragging an extent, we keep on |
| 1037 | * defragging it |
| 1038 | */ |
| 1039 | if (start < *defrag_end) |
| 1040 | return 1; |
| 1041 | |
| 1042 | *skip = 0; |
| 1043 | |
| 1044 | em = defrag_lookup_extent(inode, start); |
| 1045 | if (!em) |
| 1046 | return 0; |
| 1047 | |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 1048 | /* this will cover holes, and inline extents */ |
Liu Bo | 17ce6ef | 2012-03-29 09:57:45 -0400 | [diff] [blame] | 1049 | if (em->block_start >= EXTENT_MAP_LAST_BYTE) { |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 1050 | ret = 0; |
Liu Bo | 17ce6ef | 2012-03-29 09:57:45 -0400 | [diff] [blame] | 1051 | goto out; |
| 1052 | } |
| 1053 | |
Liu Bo | 4a3560c | 2015-08-07 16:48:41 +0800 | [diff] [blame] | 1054 | if (!*defrag_end) |
| 1055 | prev_mergeable = false; |
| 1056 | |
Li Zefan | 6c282eb | 2012-06-11 16:03:35 +0800 | [diff] [blame] | 1057 | next_mergeable = defrag_check_next_extent(inode, em); |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 1058 | /* |
Li Zefan | 6c282eb | 2012-06-11 16:03:35 +0800 | [diff] [blame] | 1059 | * we hit a real extent, if it is big or the next extent is not a |
| 1060 | * real extent, don't bother defragging it |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 1061 | */ |
Andrew Mahone | a43a211 | 2012-06-19 21:08:32 -0400 | [diff] [blame] | 1062 | if (!compress && (*last_len == 0 || *last_len >= thresh) && |
Liu Bo | 4a3560c | 2015-08-07 16:48:41 +0800 | [diff] [blame] | 1063 | (em->len >= thresh || (!next_mergeable && !prev_mergeable))) |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 1064 | ret = 0; |
Liu Bo | 17ce6ef | 2012-03-29 09:57:45 -0400 | [diff] [blame] | 1065 | out: |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 1066 | /* |
| 1067 | * last_len ends up being a counter of how many bytes we've defragged. |
| 1068 | * every time we choose not to defrag an extent, we reset *last_len |
| 1069 | * so that the next tiny extent will force a defrag. |
| 1070 | * |
| 1071 | * The end result of this is that tiny extents before a single big |
| 1072 | * extent will force at least part of that big extent to be defragged. |
| 1073 | */ |
| 1074 | if (ret) { |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 1075 | *defrag_end = extent_map_end(em); |
| 1076 | } else { |
| 1077 | *last_len = 0; |
| 1078 | *skip = extent_map_end(em); |
| 1079 | *defrag_end = 0; |
| 1080 | } |
| 1081 | |
| 1082 | free_extent_map(em); |
| 1083 | return ret; |
| 1084 | } |
| 1085 | |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1086 | /* |
| 1087 | * it doesn't do much good to defrag one or two pages |
| 1088 | * at a time. This pulls in a nice chunk of pages |
| 1089 | * to COW and defrag. |
| 1090 | * |
| 1091 | * It also makes sure the delalloc code has enough |
| 1092 | * dirty data to avoid making new small extents as part |
| 1093 | * of the defrag |
| 1094 | * |
| 1095 | * It's a good idea to start RA on this range |
| 1096 | * before calling this. |
| 1097 | */ |
| 1098 | static int cluster_pages_for_defrag(struct inode *inode, |
| 1099 | struct page **pages, |
| 1100 | unsigned long start_index, |
Justin Maggard | c41570c | 2014-01-21 11:18:29 -0800 | [diff] [blame] | 1101 | unsigned long num_pages) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1102 | { |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1103 | unsigned long file_end; |
| 1104 | u64 isize = i_size_read(inode); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1105 | u64 page_start; |
| 1106 | u64 page_end; |
Liu Bo | 1f12bd0 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 1107 | u64 page_cnt; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1108 | int ret; |
| 1109 | int i; |
| 1110 | int i_done; |
| 1111 | struct btrfs_ordered_extent *ordered; |
| 1112 | struct extent_state *cached_state = NULL; |
Miao Xie | 600a45e | 2012-02-16 15:01:24 +0800 | [diff] [blame] | 1113 | struct extent_io_tree *tree; |
Josef Bacik | 3b16a4e | 2011-09-21 15:05:58 -0400 | [diff] [blame] | 1114 | gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1115 | |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1116 | file_end = (isize - 1) >> PAGE_CACHE_SHIFT; |
Liu Bo | 1f12bd0 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 1117 | if (!isize || start_index > file_end) |
| 1118 | return 0; |
| 1119 | |
| 1120 | page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1121 | |
| 1122 | ret = btrfs_delalloc_reserve_space(inode, |
Qu Wenruo | df48063 | 2015-09-08 17:25:54 +0800 | [diff] [blame] | 1123 | start_index << PAGE_CACHE_SHIFT, |
| 1124 | page_cnt << PAGE_CACHE_SHIFT); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1125 | if (ret) |
| 1126 | return ret; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1127 | i_done = 0; |
Miao Xie | 600a45e | 2012-02-16 15:01:24 +0800 | [diff] [blame] | 1128 | tree = &BTRFS_I(inode)->io_tree; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1129 | |
| 1130 | /* step one, lock all the pages */ |
Liu Bo | 1f12bd0 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 1131 | for (i = 0; i < page_cnt; i++) { |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1132 | struct page *page; |
Miao Xie | 600a45e | 2012-02-16 15:01:24 +0800 | [diff] [blame] | 1133 | again: |
Josef Bacik | a94733d | 2011-07-11 10:47:06 -0400 | [diff] [blame] | 1134 | page = find_or_create_page(inode->i_mapping, |
Miao Xie | 600a45e | 2012-02-16 15:01:24 +0800 | [diff] [blame] | 1135 | start_index + i, mask); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1136 | if (!page) |
| 1137 | break; |
| 1138 | |
Miao Xie | 600a45e | 2012-02-16 15:01:24 +0800 | [diff] [blame] | 1139 | page_start = page_offset(page); |
| 1140 | page_end = page_start + PAGE_CACHE_SIZE - 1; |
| 1141 | while (1) { |
Filipe Manana | 308d980 | 2014-03-11 13:56:15 +0000 | [diff] [blame] | 1142 | lock_extent_bits(tree, page_start, page_end, |
| 1143 | 0, &cached_state); |
Miao Xie | 600a45e | 2012-02-16 15:01:24 +0800 | [diff] [blame] | 1144 | ordered = btrfs_lookup_ordered_extent(inode, |
| 1145 | page_start); |
Filipe Manana | 308d980 | 2014-03-11 13:56:15 +0000 | [diff] [blame] | 1146 | unlock_extent_cached(tree, page_start, page_end, |
| 1147 | &cached_state, GFP_NOFS); |
Miao Xie | 600a45e | 2012-02-16 15:01:24 +0800 | [diff] [blame] | 1148 | if (!ordered) |
| 1149 | break; |
| 1150 | |
| 1151 | unlock_page(page); |
| 1152 | btrfs_start_ordered_extent(inode, ordered, 1); |
| 1153 | btrfs_put_ordered_extent(ordered); |
| 1154 | lock_page(page); |
Liu Bo | 1f12bd0 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 1155 | /* |
| 1156 | * we unlocked the page above, so we need check if |
| 1157 | * it was released or not. |
| 1158 | */ |
| 1159 | if (page->mapping != inode->i_mapping) { |
| 1160 | unlock_page(page); |
| 1161 | page_cache_release(page); |
| 1162 | goto again; |
| 1163 | } |
Miao Xie | 600a45e | 2012-02-16 15:01:24 +0800 | [diff] [blame] | 1164 | } |
| 1165 | |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1166 | if (!PageUptodate(page)) { |
| 1167 | btrfs_readpage(NULL, page); |
| 1168 | lock_page(page); |
| 1169 | if (!PageUptodate(page)) { |
| 1170 | unlock_page(page); |
| 1171 | page_cache_release(page); |
| 1172 | ret = -EIO; |
| 1173 | break; |
| 1174 | } |
| 1175 | } |
Miao Xie | 600a45e | 2012-02-16 15:01:24 +0800 | [diff] [blame] | 1176 | |
Miao Xie | 600a45e | 2012-02-16 15:01:24 +0800 | [diff] [blame] | 1177 | if (page->mapping != inode->i_mapping) { |
| 1178 | unlock_page(page); |
| 1179 | page_cache_release(page); |
| 1180 | goto again; |
| 1181 | } |
| 1182 | |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1183 | pages[i] = page; |
| 1184 | i_done++; |
| 1185 | } |
| 1186 | if (!i_done || ret) |
| 1187 | goto out; |
| 1188 | |
| 1189 | if (!(inode->i_sb->s_flags & MS_ACTIVE)) |
| 1190 | goto out; |
| 1191 | |
| 1192 | /* |
| 1193 | * so now we have a nice long stream of locked |
| 1194 | * and up to date pages, lets wait on them |
| 1195 | */ |
| 1196 | for (i = 0; i < i_done; i++) |
| 1197 | wait_on_page_writeback(pages[i]); |
| 1198 | |
| 1199 | page_start = page_offset(pages[0]); |
| 1200 | page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE; |
| 1201 | |
| 1202 | lock_extent_bits(&BTRFS_I(inode)->io_tree, |
Jeff Mahoney | d008237 | 2012-03-01 14:57:19 +0100 | [diff] [blame] | 1203 | page_start, page_end - 1, 0, &cached_state); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1204 | clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, |
| 1205 | page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | |
Liu Bo | 9e8a4a8 | 2012-09-05 19:10:51 -0600 | [diff] [blame] | 1206 | EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0, |
| 1207 | &cached_state, GFP_NOFS); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1208 | |
Liu Bo | 1f12bd0 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 1209 | if (i_done != page_cnt) { |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 1210 | spin_lock(&BTRFS_I(inode)->lock); |
| 1211 | BTRFS_I(inode)->outstanding_extents++; |
| 1212 | spin_unlock(&BTRFS_I(inode)->lock); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1213 | btrfs_delalloc_release_space(inode, |
Qu Wenruo | df48063 | 2015-09-08 17:25:54 +0800 | [diff] [blame] | 1214 | start_index << PAGE_CACHE_SHIFT, |
| 1215 | (page_cnt - i_done) << PAGE_CACHE_SHIFT); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1216 | } |
| 1217 | |
| 1218 | |
Liu Bo | 9e8a4a8 | 2012-09-05 19:10:51 -0600 | [diff] [blame] | 1219 | set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, |
| 1220 | &cached_state, GFP_NOFS); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1221 | |
| 1222 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, |
| 1223 | page_start, page_end - 1, &cached_state, |
| 1224 | GFP_NOFS); |
| 1225 | |
| 1226 | for (i = 0; i < i_done; i++) { |
| 1227 | clear_page_dirty_for_io(pages[i]); |
| 1228 | ClearPageChecked(pages[i]); |
| 1229 | set_page_extent_mapped(pages[i]); |
| 1230 | set_page_dirty(pages[i]); |
| 1231 | unlock_page(pages[i]); |
| 1232 | page_cache_release(pages[i]); |
| 1233 | } |
| 1234 | return i_done; |
| 1235 | out: |
| 1236 | for (i = 0; i < i_done; i++) { |
| 1237 | unlock_page(pages[i]); |
| 1238 | page_cache_release(pages[i]); |
| 1239 | } |
Qu Wenruo | 7cf5b97 | 2015-09-08 17:25:55 +0800 | [diff] [blame] | 1240 | btrfs_delalloc_release_space(inode, |
Qu Wenruo | df48063 | 2015-09-08 17:25:54 +0800 | [diff] [blame] | 1241 | start_index << PAGE_CACHE_SHIFT, |
| 1242 | page_cnt << PAGE_CACHE_SHIFT); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1243 | return ret; |
| 1244 | |
| 1245 | } |
| 1246 | |
| 1247 | int btrfs_defrag_file(struct inode *inode, struct file *file, |
| 1248 | struct btrfs_ioctl_defrag_range_args *range, |
| 1249 | u64 newer_than, unsigned long max_to_defrag) |
| 1250 | { |
| 1251 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1252 | struct file_ra_state *ra = NULL; |
| 1253 | unsigned long last_index; |
Li Zefan | 151a31b | 2011-09-02 15:56:39 +0800 | [diff] [blame] | 1254 | u64 isize = i_size_read(inode); |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 1255 | u64 last_len = 0; |
| 1256 | u64 skip = 0; |
| 1257 | u64 defrag_end = 0; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1258 | u64 newer_off = range->start; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1259 | unsigned long i; |
Li Zefan | 008873e | 2011-09-02 15:57:07 +0800 | [diff] [blame] | 1260 | unsigned long ra_index = 0; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1261 | int ret; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1262 | int defrag_count = 0; |
Li Zefan | 1a419d8 | 2010-10-25 15:12:50 +0800 | [diff] [blame] | 1263 | int compress_type = BTRFS_COMPRESS_ZLIB; |
David Sterba | aab110a | 2014-07-29 17:32:10 +0200 | [diff] [blame] | 1264 | u32 extent_thresh = range->extent_thresh; |
Justin Maggard | c41570c | 2014-01-21 11:18:29 -0800 | [diff] [blame] | 1265 | unsigned long max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT; |
| 1266 | unsigned long cluster = max_cluster; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1267 | u64 new_align = ~((u64)128 * 1024 - 1); |
| 1268 | struct page **pages = NULL; |
| 1269 | |
Liu Bo | 0abd5b1 | 2013-04-16 09:20:28 +0000 | [diff] [blame] | 1270 | if (isize == 0) |
| 1271 | return 0; |
| 1272 | |
| 1273 | if (range->start >= isize) |
| 1274 | return -EINVAL; |
Li Zefan | 1a419d8 | 2010-10-25 15:12:50 +0800 | [diff] [blame] | 1275 | |
| 1276 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { |
| 1277 | if (range->compress_type > BTRFS_COMPRESS_TYPES) |
| 1278 | return -EINVAL; |
| 1279 | if (range->compress_type) |
| 1280 | compress_type = range->compress_type; |
| 1281 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1282 | |
Liu Bo | 0abd5b1 | 2013-04-16 09:20:28 +0000 | [diff] [blame] | 1283 | if (extent_thresh == 0) |
| 1284 | extent_thresh = 256 * 1024; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1285 | |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1286 | /* |
| 1287 | * if we were not given a file, allocate a readahead |
| 1288 | * context |
| 1289 | */ |
| 1290 | if (!file) { |
| 1291 | ra = kzalloc(sizeof(*ra), GFP_NOFS); |
| 1292 | if (!ra) |
| 1293 | return -ENOMEM; |
| 1294 | file_ra_state_init(ra, inode->i_mapping); |
| 1295 | } else { |
| 1296 | ra = &file->f_ra; |
| 1297 | } |
| 1298 | |
Dulshani Gunawardhana | d9b0d9b | 2013-10-31 10:32:18 +0530 | [diff] [blame] | 1299 | pages = kmalloc_array(max_cluster, sizeof(struct page *), |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1300 | GFP_NOFS); |
| 1301 | if (!pages) { |
| 1302 | ret = -ENOMEM; |
| 1303 | goto out_ra; |
| 1304 | } |
| 1305 | |
| 1306 | /* find the last page to defrag */ |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 1307 | if (range->start + range->len > range->start) { |
Li Zefan | 151a31b | 2011-09-02 15:56:39 +0800 | [diff] [blame] | 1308 | last_index = min_t(u64, isize - 1, |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 1309 | range->start + range->len - 1) >> PAGE_CACHE_SHIFT; |
| 1310 | } else { |
Li Zefan | 151a31b | 2011-09-02 15:56:39 +0800 | [diff] [blame] | 1311 | last_index = (isize - 1) >> PAGE_CACHE_SHIFT; |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 1312 | } |
| 1313 | |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1314 | if (newer_than) { |
| 1315 | ret = find_new_extents(root, inode, newer_than, |
| 1316 | &newer_off, 64 * 1024); |
| 1317 | if (!ret) { |
| 1318 | range->start = newer_off; |
| 1319 | /* |
| 1320 | * we always align our defrag to help keep |
| 1321 | * the extents in the file evenly spaced |
| 1322 | */ |
| 1323 | i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1324 | } else |
| 1325 | goto out_ra; |
| 1326 | } else { |
| 1327 | i = range->start >> PAGE_CACHE_SHIFT; |
| 1328 | } |
| 1329 | if (!max_to_defrag) |
chandan | 070034b | 2015-06-09 10:35:11 +0530 | [diff] [blame] | 1330 | max_to_defrag = last_index - i + 1; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1331 | |
Li Zefan | 2a0f7f5 | 2011-10-10 15:43:34 -0400 | [diff] [blame] | 1332 | /* |
| 1333 | * make writeback starts from i, so the defrag range can be |
| 1334 | * written sequentially. |
| 1335 | */ |
| 1336 | if (i < inode->i_mapping->writeback_index) |
| 1337 | inode->i_mapping->writeback_index = i; |
| 1338 | |
Chris Mason | f7f43cc | 2011-10-11 11:41:40 -0400 | [diff] [blame] | 1339 | while (i <= last_index && defrag_count < max_to_defrag && |
David Sterba | ed6078f | 2014-06-05 01:59:57 +0200 | [diff] [blame] | 1340 | (i < DIV_ROUND_UP(i_size_read(inode), PAGE_CACHE_SIZE))) { |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1341 | /* |
| 1342 | * make sure we stop running if someone unmounts |
| 1343 | * the FS |
| 1344 | */ |
| 1345 | if (!(inode->i_sb->s_flags & MS_ACTIVE)) |
| 1346 | break; |
| 1347 | |
David Sterba | 210549e | 2013-02-09 23:38:06 +0000 | [diff] [blame] | 1348 | if (btrfs_defrag_cancelled(root->fs_info)) { |
David Sterba | f14d104 | 2015-10-08 11:37:06 +0200 | [diff] [blame] | 1349 | btrfs_debug(root->fs_info, "defrag_file cancelled"); |
David Sterba | 210549e | 2013-02-09 23:38:06 +0000 | [diff] [blame] | 1350 | ret = -EAGAIN; |
| 1351 | break; |
| 1352 | } |
| 1353 | |
Liu Bo | 66c2689 | 2012-03-29 09:57:45 -0400 | [diff] [blame] | 1354 | if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, |
Li Zefan | 6c282eb | 2012-06-11 16:03:35 +0800 | [diff] [blame] | 1355 | extent_thresh, &last_len, &skip, |
Andrew Mahone | a43a211 | 2012-06-19 21:08:32 -0400 | [diff] [blame] | 1356 | &defrag_end, range->flags & |
| 1357 | BTRFS_DEFRAG_RANGE_COMPRESS)) { |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 1358 | unsigned long next; |
| 1359 | /* |
| 1360 | * the should_defrag function tells us how much to skip |
| 1361 | * bump our counter by the suggested amount |
| 1362 | */ |
David Sterba | ed6078f | 2014-06-05 01:59:57 +0200 | [diff] [blame] | 1363 | next = DIV_ROUND_UP(skip, PAGE_CACHE_SIZE); |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 1364 | i = max(i + 1, next); |
| 1365 | continue; |
| 1366 | } |
Li Zefan | 008873e | 2011-09-02 15:57:07 +0800 | [diff] [blame] | 1367 | |
| 1368 | if (!newer_than) { |
| 1369 | cluster = (PAGE_CACHE_ALIGN(defrag_end) >> |
| 1370 | PAGE_CACHE_SHIFT) - i; |
| 1371 | cluster = min(cluster, max_cluster); |
| 1372 | } else { |
| 1373 | cluster = max_cluster; |
| 1374 | } |
| 1375 | |
Li Zefan | 008873e | 2011-09-02 15:57:07 +0800 | [diff] [blame] | 1376 | if (i + cluster > ra_index) { |
| 1377 | ra_index = max(i, ra_index); |
| 1378 | btrfs_force_ra(inode->i_mapping, ra, file, ra_index, |
| 1379 | cluster); |
chandan | e4826a5 | 2015-06-09 17:38:32 +0530 | [diff] [blame] | 1380 | ra_index += cluster; |
Li Zefan | 008873e | 2011-09-02 15:57:07 +0800 | [diff] [blame] | 1381 | } |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 1382 | |
Liu Bo | ecb8bea | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 1383 | mutex_lock(&inode->i_mutex); |
Filipe David Borba Manana | 633085c | 2013-08-16 15:23:33 +0100 | [diff] [blame] | 1384 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) |
| 1385 | BTRFS_I(inode)->force_compress = compress_type; |
Li Zefan | 008873e | 2011-09-02 15:57:07 +0800 | [diff] [blame] | 1386 | ret = cluster_pages_for_defrag(inode, pages, i, cluster); |
Liu Bo | ecb8bea | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 1387 | if (ret < 0) { |
| 1388 | mutex_unlock(&inode->i_mutex); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1389 | goto out_ra; |
Liu Bo | ecb8bea | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 1390 | } |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 1391 | |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1392 | defrag_count += ret; |
Namjae Jeon | d0e1d66 | 2012-12-11 16:00:21 -0800 | [diff] [blame] | 1393 | balance_dirty_pages_ratelimited(inode->i_mapping); |
Liu Bo | ecb8bea | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 1394 | mutex_unlock(&inode->i_mutex); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1395 | |
| 1396 | if (newer_than) { |
| 1397 | if (newer_off == (u64)-1) |
| 1398 | break; |
| 1399 | |
Liu Bo | e1f041e1 | 2012-03-29 09:57:45 -0400 | [diff] [blame] | 1400 | if (ret > 0) |
| 1401 | i += ret; |
| 1402 | |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1403 | newer_off = max(newer_off + 1, |
| 1404 | (u64)i << PAGE_CACHE_SHIFT); |
| 1405 | |
| 1406 | ret = find_new_extents(root, inode, |
| 1407 | newer_than, &newer_off, |
| 1408 | 64 * 1024); |
| 1409 | if (!ret) { |
| 1410 | range->start = newer_off; |
| 1411 | i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1412 | } else { |
| 1413 | break; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1414 | } |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1415 | } else { |
Li Zefan | 008873e | 2011-09-02 15:57:07 +0800 | [diff] [blame] | 1416 | if (ret > 0) { |
Li Zefan | cbcc832 | 2011-09-02 15:56:25 +0800 | [diff] [blame] | 1417 | i += ret; |
Li Zefan | 008873e | 2011-09-02 15:57:07 +0800 | [diff] [blame] | 1418 | last_len += ret << PAGE_CACHE_SHIFT; |
| 1419 | } else { |
Li Zefan | cbcc832 | 2011-09-02 15:56:25 +0800 | [diff] [blame] | 1420 | i++; |
Li Zefan | 008873e | 2011-09-02 15:57:07 +0800 | [diff] [blame] | 1421 | last_len = 0; |
| 1422 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1423 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1424 | } |
| 1425 | |
Filipe Manana | dec8ef9 | 2014-03-01 10:55:54 +0000 | [diff] [blame] | 1426 | if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) { |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 1427 | filemap_flush(inode->i_mapping); |
Filipe Manana | dec8ef9 | 2014-03-01 10:55:54 +0000 | [diff] [blame] | 1428 | if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, |
| 1429 | &BTRFS_I(inode)->runtime_flags)) |
| 1430 | filemap_flush(inode->i_mapping); |
| 1431 | } |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 1432 | |
| 1433 | if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { |
| 1434 | /* the filemap_flush will queue IO into the worker threads, but |
| 1435 | * we have to make sure the IO is actually started and that |
| 1436 | * ordered extents get created before we return |
| 1437 | */ |
| 1438 | atomic_inc(&root->fs_info->async_submit_draining); |
| 1439 | while (atomic_read(&root->fs_info->nr_async_submits) || |
| 1440 | atomic_read(&root->fs_info->async_delalloc_pages)) { |
| 1441 | wait_event(root->fs_info->async_submit_wait, |
| 1442 | (atomic_read(&root->fs_info->nr_async_submits) == 0 && |
| 1443 | atomic_read(&root->fs_info->async_delalloc_pages) == 0)); |
| 1444 | } |
| 1445 | atomic_dec(&root->fs_info->async_submit_draining); |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 1446 | } |
| 1447 | |
Li Zefan | 1a419d8 | 2010-10-25 15:12:50 +0800 | [diff] [blame] | 1448 | if (range->compress_type == BTRFS_COMPRESS_LZO) { |
Mitch Harder | 2b0ce2c | 2012-07-24 11:58:43 -0600 | [diff] [blame] | 1449 | btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO); |
Li Zefan | 1a419d8 | 2010-10-25 15:12:50 +0800 | [diff] [blame] | 1450 | } |
| 1451 | |
Diego Calleja | 60ccf82 | 2011-09-01 16:33:57 +0200 | [diff] [blame] | 1452 | ret = defrag_count; |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 1453 | |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1454 | out_ra: |
Filipe David Borba Manana | 633085c | 2013-08-16 15:23:33 +0100 | [diff] [blame] | 1455 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { |
| 1456 | mutex_lock(&inode->i_mutex); |
| 1457 | BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; |
| 1458 | mutex_unlock(&inode->i_mutex); |
| 1459 | } |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1460 | if (!file) |
| 1461 | kfree(ra); |
| 1462 | kfree(pages); |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 1463 | return ret; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1464 | } |
| 1465 | |
Miao Xie | 198605a | 2012-11-26 08:43:45 +0000 | [diff] [blame] | 1466 | static noinline int btrfs_ioctl_resize(struct file *file, |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 1467 | void __user *arg) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1468 | { |
| 1469 | u64 new_size; |
| 1470 | u64 old_size; |
| 1471 | u64 devid = 1; |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1472 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1473 | struct btrfs_ioctl_vol_args *vol_args; |
| 1474 | struct btrfs_trans_handle *trans; |
| 1475 | struct btrfs_device *device = NULL; |
| 1476 | char *sizestr; |
Gui Hecheng | 9a40f12 | 2014-03-31 18:03:25 +0800 | [diff] [blame] | 1477 | char *retptr; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1478 | char *devstr = NULL; |
| 1479 | int ret = 0; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1480 | int mod = 0; |
| 1481 | |
Chris Mason | e441d54 | 2009-01-05 16:57:23 -0500 | [diff] [blame] | 1482 | if (!capable(CAP_SYS_ADMIN)) |
| 1483 | return -EPERM; |
| 1484 | |
Miao Xie | 198605a | 2012-11-26 08:43:45 +0000 | [diff] [blame] | 1485 | ret = mnt_want_write_file(file); |
| 1486 | if (ret) |
| 1487 | return ret; |
| 1488 | |
Stefan Behrens | 5ac00ad | 2012-11-05 17:54:08 +0100 | [diff] [blame] | 1489 | if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, |
| 1490 | 1)) { |
Miao Xie | 9754767 | 2012-12-21 10:38:50 +0000 | [diff] [blame] | 1491 | mnt_drop_write_file(file); |
Anand Jain | e57138b | 2013-08-21 11:44:48 +0800 | [diff] [blame] | 1492 | return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 1493 | } |
| 1494 | |
Stefan Behrens | 5ac00ad | 2012-11-05 17:54:08 +0100 | [diff] [blame] | 1495 | mutex_lock(&root->fs_info->volume_mutex); |
Li Zefan | dae7b66 | 2009-04-08 15:06:54 +0800 | [diff] [blame] | 1496 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 1497 | if (IS_ERR(vol_args)) { |
| 1498 | ret = PTR_ERR(vol_args); |
| 1499 | goto out; |
| 1500 | } |
Mark Fasheh | 5516e59 | 2008-07-24 12:20:14 -0400 | [diff] [blame] | 1501 | |
| 1502 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1503 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1504 | sizestr = vol_args->name; |
| 1505 | devstr = strchr(sizestr, ':'); |
| 1506 | if (devstr) { |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1507 | sizestr = devstr + 1; |
| 1508 | *devstr = '\0'; |
| 1509 | devstr = vol_args->name; |
ZhangZhen | 58dfae6 | 2014-05-13 16:36:08 +0800 | [diff] [blame] | 1510 | ret = kstrtoull(devstr, 10, &devid); |
| 1511 | if (ret) |
| 1512 | goto out_free; |
Miao Xie | dfd7982 | 2012-12-21 09:21:30 +0000 | [diff] [blame] | 1513 | if (!devid) { |
| 1514 | ret = -EINVAL; |
| 1515 | goto out_free; |
| 1516 | } |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 1517 | btrfs_info(root->fs_info, "resizing devid %llu", devid); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1518 | } |
Miao Xie | dba60f3 | 2012-12-21 09:19:51 +0000 | [diff] [blame] | 1519 | |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 1520 | device = btrfs_find_device(root->fs_info, devid, NULL, NULL); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1521 | if (!device) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 1522 | btrfs_info(root->fs_info, "resizer unable to find device %llu", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 1523 | devid); |
Miao Xie | dfd7982 | 2012-12-21 09:21:30 +0000 | [diff] [blame] | 1524 | ret = -ENODEV; |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 1525 | goto out_free; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1526 | } |
Miao Xie | dba60f3 | 2012-12-21 09:19:51 +0000 | [diff] [blame] | 1527 | |
| 1528 | if (!device->writeable) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 1529 | btrfs_info(root->fs_info, |
| 1530 | "resizer unable to apply on readonly device %llu", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 1531 | devid); |
Miao Xie | dfd7982 | 2012-12-21 09:21:30 +0000 | [diff] [blame] | 1532 | ret = -EPERM; |
Liu Bo | 4e42ae1 | 2012-06-14 02:23:19 -0600 | [diff] [blame] | 1533 | goto out_free; |
| 1534 | } |
| 1535 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1536 | if (!strcmp(sizestr, "max")) |
| 1537 | new_size = device->bdev->bd_inode->i_size; |
| 1538 | else { |
| 1539 | if (sizestr[0] == '-') { |
| 1540 | mod = -1; |
| 1541 | sizestr++; |
| 1542 | } else if (sizestr[0] == '+') { |
| 1543 | mod = 1; |
| 1544 | sizestr++; |
| 1545 | } |
Gui Hecheng | 9a40f12 | 2014-03-31 18:03:25 +0800 | [diff] [blame] | 1546 | new_size = memparse(sizestr, &retptr); |
| 1547 | if (*retptr != '\0' || new_size == 0) { |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1548 | ret = -EINVAL; |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 1549 | goto out_free; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1550 | } |
| 1551 | } |
| 1552 | |
Stefan Behrens | 63a212a | 2012-11-05 18:29:28 +0100 | [diff] [blame] | 1553 | if (device->is_tgtdev_for_dev_replace) { |
Miao Xie | dfd7982 | 2012-12-21 09:21:30 +0000 | [diff] [blame] | 1554 | ret = -EPERM; |
Stefan Behrens | 63a212a | 2012-11-05 18:29:28 +0100 | [diff] [blame] | 1555 | goto out_free; |
| 1556 | } |
| 1557 | |
Miao Xie | 7cc8e58 | 2014-09-03 21:35:38 +0800 | [diff] [blame] | 1558 | old_size = btrfs_device_get_total_bytes(device); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1559 | |
| 1560 | if (mod < 0) { |
| 1561 | if (new_size > old_size) { |
| 1562 | ret = -EINVAL; |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 1563 | goto out_free; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1564 | } |
| 1565 | new_size = old_size - new_size; |
| 1566 | } else if (mod > 0) { |
Wenliang Fan | eb8052e | 2013-12-20 15:28:56 +0800 | [diff] [blame] | 1567 | if (new_size > ULLONG_MAX - old_size) { |
Gui Hecheng | 902c68a | 2014-05-29 09:19:58 +0800 | [diff] [blame] | 1568 | ret = -ERANGE; |
Wenliang Fan | eb8052e | 2013-12-20 15:28:56 +0800 | [diff] [blame] | 1569 | goto out_free; |
| 1570 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1571 | new_size = old_size + new_size; |
| 1572 | } |
| 1573 | |
| 1574 | if (new_size < 256 * 1024 * 1024) { |
| 1575 | ret = -EINVAL; |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 1576 | goto out_free; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1577 | } |
| 1578 | if (new_size > device->bdev->bd_inode->i_size) { |
| 1579 | ret = -EFBIG; |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 1580 | goto out_free; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1581 | } |
| 1582 | |
David Sterba | b8b93ad | 2015-01-16 17:26:13 +0100 | [diff] [blame] | 1583 | new_size = div_u64(new_size, root->sectorsize); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1584 | new_size *= root->sectorsize; |
| 1585 | |
David Sterba | ecaeb14 | 2015-10-08 09:01:03 +0200 | [diff] [blame] | 1586 | btrfs_info_in_rcu(root->fs_info, "new size for %s is %llu", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 1587 | rcu_str_deref(device->name), new_size); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1588 | |
| 1589 | if (new_size > old_size) { |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1590 | trans = btrfs_start_transaction(root, 0); |
Tsutomu Itoh | 98d5dc1 | 2011-01-20 06:19:37 +0000 | [diff] [blame] | 1591 | if (IS_ERR(trans)) { |
| 1592 | ret = PTR_ERR(trans); |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 1593 | goto out_free; |
Tsutomu Itoh | 98d5dc1 | 2011-01-20 06:19:37 +0000 | [diff] [blame] | 1594 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1595 | ret = btrfs_grow_device(trans, device, new_size); |
| 1596 | btrfs_commit_transaction(trans, root); |
Mike Fleetwood | ece7d20 | 2011-11-18 18:55:01 +0000 | [diff] [blame] | 1597 | } else if (new_size < old_size) { |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1598 | ret = btrfs_shrink_device(device, new_size); |
jeff.liu | 0253f40 | 2012-10-27 12:06:39 +0000 | [diff] [blame] | 1599 | } /* equal, nothing need to do */ |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1600 | |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 1601 | out_free: |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1602 | kfree(vol_args); |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 1603 | out: |
| 1604 | mutex_unlock(&root->fs_info->volume_mutex); |
Stefan Behrens | 5ac00ad | 2012-11-05 17:54:08 +0100 | [diff] [blame] | 1605 | atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); |
Ilya Dryomov | 18f39c4 | 2013-01-20 15:57:57 +0200 | [diff] [blame] | 1606 | mnt_drop_write_file(file); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1607 | return ret; |
| 1608 | } |
| 1609 | |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 1610 | static noinline int btrfs_ioctl_snap_create_transid(struct file *file, |
Arne Jansen | 6f72c7e | 2011-09-14 15:58:21 +0200 | [diff] [blame] | 1611 | char *name, unsigned long fd, int subvol, |
| 1612 | u64 *transid, bool readonly, |
Miao Xie | 8696c53 | 2013-02-07 06:02:44 +0000 | [diff] [blame] | 1613 | struct btrfs_qgroup_inherit *inherit) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1614 | { |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1615 | int namelen; |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1616 | int ret = 0; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1617 | |
Liu Bo | a874a63 | 2012-06-29 03:58:46 -0600 | [diff] [blame] | 1618 | ret = mnt_want_write_file(file); |
| 1619 | if (ret) |
| 1620 | goto out; |
| 1621 | |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 1622 | namelen = strlen(name); |
| 1623 | if (strchr(name, '/')) { |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1624 | ret = -EINVAL; |
Liu Bo | a874a63 | 2012-06-29 03:58:46 -0600 | [diff] [blame] | 1625 | goto out_drop_write; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1626 | } |
| 1627 | |
Chris Mason | 16780ca | 2012-02-20 22:14:55 -0500 | [diff] [blame] | 1628 | if (name[0] == '.' && |
| 1629 | (namelen == 1 || (name[1] == '.' && namelen == 2))) { |
| 1630 | ret = -EEXIST; |
Liu Bo | a874a63 | 2012-06-29 03:58:46 -0600 | [diff] [blame] | 1631 | goto out_drop_write; |
Chris Mason | 16780ca | 2012-02-20 22:14:55 -0500 | [diff] [blame] | 1632 | } |
| 1633 | |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1634 | if (subvol) { |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 1635 | ret = btrfs_mksubvol(&file->f_path, name, namelen, |
Arne Jansen | 6f72c7e | 2011-09-14 15:58:21 +0200 | [diff] [blame] | 1636 | NULL, transid, readonly, inherit); |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 1637 | } else { |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1638 | struct fd src = fdget(fd); |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1639 | struct inode *src_inode; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1640 | if (!src.file) { |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1641 | ret = -EINVAL; |
Liu Bo | a874a63 | 2012-06-29 03:58:46 -0600 | [diff] [blame] | 1642 | goto out_drop_write; |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1643 | } |
| 1644 | |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1645 | src_inode = file_inode(src.file); |
| 1646 | if (src_inode->i_sb != file_inode(file)->i_sb) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 1647 | btrfs_info(BTRFS_I(src_inode)->root->fs_info, |
| 1648 | "Snapshot src from another FS"); |
Kusanagi Kouichi | 23ad5b1 | 2014-01-30 16:32:02 +0900 | [diff] [blame] | 1649 | ret = -EXDEV; |
David Sterba | d024206 | 2014-01-15 18:15:52 +0100 | [diff] [blame] | 1650 | } else if (!inode_owner_or_capable(src_inode)) { |
| 1651 | /* |
| 1652 | * Subvolume creation is not restricted, but snapshots |
| 1653 | * are limited to own subvolumes only |
| 1654 | */ |
| 1655 | ret = -EPERM; |
Al Viro | ecd1881 | 2012-08-26 21:20:24 -0400 | [diff] [blame] | 1656 | } else { |
| 1657 | ret = btrfs_mksubvol(&file->f_path, name, namelen, |
| 1658 | BTRFS_I(src_inode)->root, |
| 1659 | transid, readonly, inherit); |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1660 | } |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1661 | fdput(src); |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 1662 | } |
Liu Bo | a874a63 | 2012-06-29 03:58:46 -0600 | [diff] [blame] | 1663 | out_drop_write: |
| 1664 | mnt_drop_write_file(file); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1665 | out: |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 1666 | return ret; |
| 1667 | } |
| 1668 | |
| 1669 | static noinline int btrfs_ioctl_snap_create(struct file *file, |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 1670 | void __user *arg, int subvol) |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 1671 | { |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 1672 | struct btrfs_ioctl_vol_args *vol_args; |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 1673 | int ret; |
| 1674 | |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 1675 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
| 1676 | if (IS_ERR(vol_args)) |
| 1677 | return PTR_ERR(vol_args); |
| 1678 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 1679 | |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 1680 | ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 1681 | vol_args->fd, subvol, |
Arne Jansen | 6f72c7e | 2011-09-14 15:58:21 +0200 | [diff] [blame] | 1682 | NULL, false, NULL); |
Li Zefan | fdfb1e4 | 2010-12-10 06:41:56 +0000 | [diff] [blame] | 1683 | |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 1684 | kfree(vol_args); |
| 1685 | return ret; |
| 1686 | } |
Li Zefan | fdfb1e4 | 2010-12-10 06:41:56 +0000 | [diff] [blame] | 1687 | |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 1688 | static noinline int btrfs_ioctl_snap_create_v2(struct file *file, |
| 1689 | void __user *arg, int subvol) |
| 1690 | { |
| 1691 | struct btrfs_ioctl_vol_args_v2 *vol_args; |
| 1692 | int ret; |
| 1693 | u64 transid = 0; |
| 1694 | u64 *ptr = NULL; |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 1695 | bool readonly = false; |
Arne Jansen | 6f72c7e | 2011-09-14 15:58:21 +0200 | [diff] [blame] | 1696 | struct btrfs_qgroup_inherit *inherit = NULL; |
Li Zefan | fdfb1e4 | 2010-12-10 06:41:56 +0000 | [diff] [blame] | 1697 | |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 1698 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
| 1699 | if (IS_ERR(vol_args)) |
| 1700 | return PTR_ERR(vol_args); |
| 1701 | vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; |
Sage Weil | 75eaa0e | 2010-12-10 00:36:28 +0000 | [diff] [blame] | 1702 | |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 1703 | if (vol_args->flags & |
Arne Jansen | 6f72c7e | 2011-09-14 15:58:21 +0200 | [diff] [blame] | 1704 | ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY | |
| 1705 | BTRFS_SUBVOL_QGROUP_INHERIT)) { |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 1706 | ret = -EOPNOTSUPP; |
Dan Carpenter | c47ca32 | 2014-09-04 14:09:15 +0300 | [diff] [blame] | 1707 | goto free_args; |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 1708 | } |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 1709 | |
| 1710 | if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) |
| 1711 | ptr = &transid; |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 1712 | if (vol_args->flags & BTRFS_SUBVOL_RDONLY) |
| 1713 | readonly = true; |
Arne Jansen | 6f72c7e | 2011-09-14 15:58:21 +0200 | [diff] [blame] | 1714 | if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { |
| 1715 | if (vol_args->size > PAGE_CACHE_SIZE) { |
| 1716 | ret = -EINVAL; |
Dan Carpenter | c47ca32 | 2014-09-04 14:09:15 +0300 | [diff] [blame] | 1717 | goto free_args; |
Arne Jansen | 6f72c7e | 2011-09-14 15:58:21 +0200 | [diff] [blame] | 1718 | } |
| 1719 | inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); |
| 1720 | if (IS_ERR(inherit)) { |
| 1721 | ret = PTR_ERR(inherit); |
Dan Carpenter | c47ca32 | 2014-09-04 14:09:15 +0300 | [diff] [blame] | 1722 | goto free_args; |
Arne Jansen | 6f72c7e | 2011-09-14 15:58:21 +0200 | [diff] [blame] | 1723 | } |
| 1724 | } |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 1725 | |
| 1726 | ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, |
Arne Jansen | 6f72c7e | 2011-09-14 15:58:21 +0200 | [diff] [blame] | 1727 | vol_args->fd, subvol, ptr, |
Miao Xie | 8696c53 | 2013-02-07 06:02:44 +0000 | [diff] [blame] | 1728 | readonly, inherit); |
Dan Carpenter | c47ca32 | 2014-09-04 14:09:15 +0300 | [diff] [blame] | 1729 | if (ret) |
| 1730 | goto free_inherit; |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 1731 | |
Dan Carpenter | c47ca32 | 2014-09-04 14:09:15 +0300 | [diff] [blame] | 1732 | if (ptr && copy_to_user(arg + |
| 1733 | offsetof(struct btrfs_ioctl_vol_args_v2, |
| 1734 | transid), |
| 1735 | ptr, sizeof(*ptr))) |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 1736 | ret = -EFAULT; |
Dan Carpenter | c47ca32 | 2014-09-04 14:09:15 +0300 | [diff] [blame] | 1737 | |
| 1738 | free_inherit: |
Arne Jansen | 6f72c7e | 2011-09-14 15:58:21 +0200 | [diff] [blame] | 1739 | kfree(inherit); |
Dan Carpenter | c47ca32 | 2014-09-04 14:09:15 +0300 | [diff] [blame] | 1740 | free_args: |
| 1741 | kfree(vol_args); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1742 | return ret; |
| 1743 | } |
| 1744 | |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1745 | static noinline int btrfs_ioctl_subvol_getflags(struct file *file, |
| 1746 | void __user *arg) |
| 1747 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1748 | struct inode *inode = file_inode(file); |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1749 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 1750 | int ret = 0; |
| 1751 | u64 flags = 0; |
| 1752 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1753 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1754 | return -EINVAL; |
| 1755 | |
| 1756 | down_read(&root->fs_info->subvol_sem); |
| 1757 | if (btrfs_root_readonly(root)) |
| 1758 | flags |= BTRFS_SUBVOL_RDONLY; |
| 1759 | up_read(&root->fs_info->subvol_sem); |
| 1760 | |
| 1761 | if (copy_to_user(arg, &flags, sizeof(flags))) |
| 1762 | ret = -EFAULT; |
| 1763 | |
| 1764 | return ret; |
| 1765 | } |
| 1766 | |
| 1767 | static noinline int btrfs_ioctl_subvol_setflags(struct file *file, |
| 1768 | void __user *arg) |
| 1769 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1770 | struct inode *inode = file_inode(file); |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1771 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 1772 | struct btrfs_trans_handle *trans; |
| 1773 | u64 root_flags; |
| 1774 | u64 flags; |
| 1775 | int ret = 0; |
| 1776 | |
David Sterba | bd60ea0 | 2014-01-16 15:50:22 +0100 | [diff] [blame] | 1777 | if (!inode_owner_or_capable(inode)) |
| 1778 | return -EPERM; |
| 1779 | |
Liu Bo | b9ca066 | 2012-06-29 03:58:49 -0600 | [diff] [blame] | 1780 | ret = mnt_want_write_file(file); |
| 1781 | if (ret) |
| 1782 | goto out; |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1783 | |
Liu Bo | b9ca066 | 2012-06-29 03:58:49 -0600 | [diff] [blame] | 1784 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { |
| 1785 | ret = -EINVAL; |
| 1786 | goto out_drop_write; |
| 1787 | } |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1788 | |
Liu Bo | b9ca066 | 2012-06-29 03:58:49 -0600 | [diff] [blame] | 1789 | if (copy_from_user(&flags, arg, sizeof(flags))) { |
| 1790 | ret = -EFAULT; |
| 1791 | goto out_drop_write; |
| 1792 | } |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1793 | |
Liu Bo | b9ca066 | 2012-06-29 03:58:49 -0600 | [diff] [blame] | 1794 | if (flags & BTRFS_SUBVOL_CREATE_ASYNC) { |
| 1795 | ret = -EINVAL; |
| 1796 | goto out_drop_write; |
| 1797 | } |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1798 | |
Liu Bo | b9ca066 | 2012-06-29 03:58:49 -0600 | [diff] [blame] | 1799 | if (flags & ~BTRFS_SUBVOL_RDONLY) { |
| 1800 | ret = -EOPNOTSUPP; |
| 1801 | goto out_drop_write; |
| 1802 | } |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1803 | |
| 1804 | down_write(&root->fs_info->subvol_sem); |
| 1805 | |
| 1806 | /* nothing to do */ |
| 1807 | if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) |
Liu Bo | b9ca066 | 2012-06-29 03:58:49 -0600 | [diff] [blame] | 1808 | goto out_drop_sem; |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1809 | |
| 1810 | root_flags = btrfs_root_flags(&root->root_item); |
David Sterba | 2c68653 | 2013-12-16 17:34:17 +0100 | [diff] [blame] | 1811 | if (flags & BTRFS_SUBVOL_RDONLY) { |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1812 | btrfs_set_root_flags(&root->root_item, |
| 1813 | root_flags | BTRFS_ROOT_SUBVOL_RDONLY); |
David Sterba | 2c68653 | 2013-12-16 17:34:17 +0100 | [diff] [blame] | 1814 | } else { |
| 1815 | /* |
| 1816 | * Block RO -> RW transition if this subvolume is involved in |
| 1817 | * send |
| 1818 | */ |
| 1819 | spin_lock(&root->root_item_lock); |
| 1820 | if (root->send_in_progress == 0) { |
| 1821 | btrfs_set_root_flags(&root->root_item, |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1822 | root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); |
David Sterba | 2c68653 | 2013-12-16 17:34:17 +0100 | [diff] [blame] | 1823 | spin_unlock(&root->root_item_lock); |
| 1824 | } else { |
| 1825 | spin_unlock(&root->root_item_lock); |
| 1826 | btrfs_warn(root->fs_info, |
| 1827 | "Attempt to set subvolume %llu read-write during send", |
| 1828 | root->root_key.objectid); |
| 1829 | ret = -EPERM; |
| 1830 | goto out_drop_sem; |
| 1831 | } |
| 1832 | } |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1833 | |
| 1834 | trans = btrfs_start_transaction(root, 1); |
| 1835 | if (IS_ERR(trans)) { |
| 1836 | ret = PTR_ERR(trans); |
| 1837 | goto out_reset; |
| 1838 | } |
| 1839 | |
Li Zefan | b4dc2b8 | 2011-02-16 06:06:34 +0000 | [diff] [blame] | 1840 | ret = btrfs_update_root(trans, root->fs_info->tree_root, |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1841 | &root->root_key, &root->root_item); |
| 1842 | |
| 1843 | btrfs_commit_transaction(trans, root); |
| 1844 | out_reset: |
| 1845 | if (ret) |
| 1846 | btrfs_set_root_flags(&root->root_item, root_flags); |
Liu Bo | b9ca066 | 2012-06-29 03:58:49 -0600 | [diff] [blame] | 1847 | out_drop_sem: |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1848 | up_write(&root->fs_info->subvol_sem); |
Liu Bo | b9ca066 | 2012-06-29 03:58:49 -0600 | [diff] [blame] | 1849 | out_drop_write: |
| 1850 | mnt_drop_write_file(file); |
| 1851 | out: |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1852 | return ret; |
| 1853 | } |
| 1854 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 1855 | /* |
| 1856 | * helper to check if the subvolume references other subvolumes |
| 1857 | */ |
| 1858 | static noinline int may_destroy_subvol(struct btrfs_root *root) |
| 1859 | { |
| 1860 | struct btrfs_path *path; |
Josef Bacik | 175a2b8 | 2013-08-12 15:36:44 -0400 | [diff] [blame] | 1861 | struct btrfs_dir_item *di; |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 1862 | struct btrfs_key key; |
Josef Bacik | 175a2b8 | 2013-08-12 15:36:44 -0400 | [diff] [blame] | 1863 | u64 dir_id; |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 1864 | int ret; |
| 1865 | |
| 1866 | path = btrfs_alloc_path(); |
| 1867 | if (!path) |
| 1868 | return -ENOMEM; |
| 1869 | |
Josef Bacik | 175a2b8 | 2013-08-12 15:36:44 -0400 | [diff] [blame] | 1870 | /* Make sure this root isn't set as the default subvol */ |
| 1871 | dir_id = btrfs_super_root_dir(root->fs_info->super_copy); |
| 1872 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path, |
| 1873 | dir_id, "default", 7, 0); |
| 1874 | if (di && !IS_ERR(di)) { |
| 1875 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key); |
| 1876 | if (key.objectid == root->root_key.objectid) { |
Guangyu Sun | 72de6b5 | 2014-03-11 11:24:18 -0700 | [diff] [blame] | 1877 | ret = -EPERM; |
| 1878 | btrfs_err(root->fs_info, "deleting default subvolume " |
| 1879 | "%llu is not allowed", key.objectid); |
Josef Bacik | 175a2b8 | 2013-08-12 15:36:44 -0400 | [diff] [blame] | 1880 | goto out; |
| 1881 | } |
| 1882 | btrfs_release_path(path); |
| 1883 | } |
| 1884 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 1885 | key.objectid = root->root_key.objectid; |
| 1886 | key.type = BTRFS_ROOT_REF_KEY; |
| 1887 | key.offset = (u64)-1; |
| 1888 | |
| 1889 | ret = btrfs_search_slot(NULL, root->fs_info->tree_root, |
| 1890 | &key, path, 0, 0); |
| 1891 | if (ret < 0) |
| 1892 | goto out; |
| 1893 | BUG_ON(ret == 0); |
| 1894 | |
| 1895 | ret = 0; |
| 1896 | if (path->slots[0] > 0) { |
| 1897 | path->slots[0]--; |
| 1898 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); |
| 1899 | if (key.objectid == root->root_key.objectid && |
| 1900 | key.type == BTRFS_ROOT_REF_KEY) |
| 1901 | ret = -ENOTEMPTY; |
| 1902 | } |
| 1903 | out: |
| 1904 | btrfs_free_path(path); |
| 1905 | return ret; |
| 1906 | } |
| 1907 | |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1908 | static noinline int key_in_sk(struct btrfs_key *key, |
| 1909 | struct btrfs_ioctl_search_key *sk) |
| 1910 | { |
Chris Mason | abc6e13 | 2010-03-18 12:10:08 -0400 | [diff] [blame] | 1911 | struct btrfs_key test; |
| 1912 | int ret; |
| 1913 | |
| 1914 | test.objectid = sk->min_objectid; |
| 1915 | test.type = sk->min_type; |
| 1916 | test.offset = sk->min_offset; |
| 1917 | |
| 1918 | ret = btrfs_comp_cpu_keys(key, &test); |
| 1919 | if (ret < 0) |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1920 | return 0; |
Chris Mason | abc6e13 | 2010-03-18 12:10:08 -0400 | [diff] [blame] | 1921 | |
| 1922 | test.objectid = sk->max_objectid; |
| 1923 | test.type = sk->max_type; |
| 1924 | test.offset = sk->max_offset; |
| 1925 | |
| 1926 | ret = btrfs_comp_cpu_keys(key, &test); |
| 1927 | if (ret > 0) |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1928 | return 0; |
| 1929 | return 1; |
| 1930 | } |
| 1931 | |
| 1932 | static noinline int copy_to_sk(struct btrfs_root *root, |
| 1933 | struct btrfs_path *path, |
| 1934 | struct btrfs_key *key, |
| 1935 | struct btrfs_ioctl_search_key *sk, |
Gerhard Heift | 9b6e817 | 2014-01-30 16:24:00 +0100 | [diff] [blame] | 1936 | size_t *buf_size, |
Gerhard Heift | ba346b3 | 2014-01-30 16:24:02 +0100 | [diff] [blame] | 1937 | char __user *ubuf, |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1938 | unsigned long *sk_offset, |
| 1939 | int *num_found) |
| 1940 | { |
| 1941 | u64 found_transid; |
| 1942 | struct extent_buffer *leaf; |
| 1943 | struct btrfs_ioctl_search_header sh; |
Naohiro Aota | dd81d45 | 2015-06-30 11:25:43 +0900 | [diff] [blame] | 1944 | struct btrfs_key test; |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1945 | unsigned long item_off; |
| 1946 | unsigned long item_len; |
| 1947 | int nritems; |
| 1948 | int i; |
| 1949 | int slot; |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1950 | int ret = 0; |
| 1951 | |
| 1952 | leaf = path->nodes[0]; |
| 1953 | slot = path->slots[0]; |
| 1954 | nritems = btrfs_header_nritems(leaf); |
| 1955 | |
| 1956 | if (btrfs_header_generation(leaf) > sk->max_transid) { |
| 1957 | i = nritems; |
| 1958 | goto advance_key; |
| 1959 | } |
| 1960 | found_transid = btrfs_header_generation(leaf); |
| 1961 | |
| 1962 | for (i = slot; i < nritems; i++) { |
| 1963 | item_off = btrfs_item_ptr_offset(leaf, i); |
| 1964 | item_len = btrfs_item_size_nr(leaf, i); |
| 1965 | |
Gabriel de Perthuis | 03b71c6 | 2013-05-06 17:40:18 +0000 | [diff] [blame] | 1966 | btrfs_item_key_to_cpu(leaf, key, i); |
| 1967 | if (!key_in_sk(key, sk)) |
| 1968 | continue; |
| 1969 | |
Gerhard Heift | 9b6e817 | 2014-01-30 16:24:00 +0100 | [diff] [blame] | 1970 | if (sizeof(sh) + item_len > *buf_size) { |
Gerhard Heift | 8f5f617 | 2014-01-30 16:23:59 +0100 | [diff] [blame] | 1971 | if (*num_found) { |
| 1972 | ret = 1; |
| 1973 | goto out; |
| 1974 | } |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1975 | |
Gerhard Heift | 8f5f617 | 2014-01-30 16:23:59 +0100 | [diff] [blame] | 1976 | /* |
| 1977 | * return one empty item back for v1, which does not |
| 1978 | * handle -EOVERFLOW |
| 1979 | */ |
| 1980 | |
Gerhard Heift | 9b6e817 | 2014-01-30 16:24:00 +0100 | [diff] [blame] | 1981 | *buf_size = sizeof(sh) + item_len; |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1982 | item_len = 0; |
Gerhard Heift | 8f5f617 | 2014-01-30 16:23:59 +0100 | [diff] [blame] | 1983 | ret = -EOVERFLOW; |
| 1984 | } |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1985 | |
Gerhard Heift | 9b6e817 | 2014-01-30 16:24:00 +0100 | [diff] [blame] | 1986 | if (sizeof(sh) + item_len + *sk_offset > *buf_size) { |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1987 | ret = 1; |
Gerhard Heift | 25c9bc2 | 2014-01-30 16:23:57 +0100 | [diff] [blame] | 1988 | goto out; |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1989 | } |
| 1990 | |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1991 | sh.objectid = key->objectid; |
| 1992 | sh.offset = key->offset; |
| 1993 | sh.type = key->type; |
| 1994 | sh.len = item_len; |
| 1995 | sh.transid = found_transid; |
| 1996 | |
| 1997 | /* copy search result header */ |
Gerhard Heift | ba346b3 | 2014-01-30 16:24:02 +0100 | [diff] [blame] | 1998 | if (copy_to_user(ubuf + *sk_offset, &sh, sizeof(sh))) { |
| 1999 | ret = -EFAULT; |
| 2000 | goto out; |
| 2001 | } |
| 2002 | |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2003 | *sk_offset += sizeof(sh); |
| 2004 | |
| 2005 | if (item_len) { |
Gerhard Heift | ba346b3 | 2014-01-30 16:24:02 +0100 | [diff] [blame] | 2006 | char __user *up = ubuf + *sk_offset; |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2007 | /* copy the item */ |
Gerhard Heift | ba346b3 | 2014-01-30 16:24:02 +0100 | [diff] [blame] | 2008 | if (read_extent_buffer_to_user(leaf, up, |
| 2009 | item_off, item_len)) { |
| 2010 | ret = -EFAULT; |
| 2011 | goto out; |
| 2012 | } |
| 2013 | |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2014 | *sk_offset += item_len; |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2015 | } |
Hugo Mills | e215686 | 2011-05-14 17:43:41 +0000 | [diff] [blame] | 2016 | (*num_found)++; |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2017 | |
Gerhard Heift | 8f5f617 | 2014-01-30 16:23:59 +0100 | [diff] [blame] | 2018 | if (ret) /* -EOVERFLOW from above */ |
| 2019 | goto out; |
| 2020 | |
Gerhard Heift | 25c9bc2 | 2014-01-30 16:23:57 +0100 | [diff] [blame] | 2021 | if (*num_found >= sk->nr_items) { |
| 2022 | ret = 1; |
| 2023 | goto out; |
| 2024 | } |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2025 | } |
| 2026 | advance_key: |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2027 | ret = 0; |
Naohiro Aota | dd81d45 | 2015-06-30 11:25:43 +0900 | [diff] [blame] | 2028 | test.objectid = sk->max_objectid; |
| 2029 | test.type = sk->max_type; |
| 2030 | test.offset = sk->max_offset; |
| 2031 | if (btrfs_comp_cpu_keys(key, &test) >= 0) |
| 2032 | ret = 1; |
| 2033 | else if (key->offset < (u64)-1) |
Chris Mason | abc6e13 | 2010-03-18 12:10:08 -0400 | [diff] [blame] | 2034 | key->offset++; |
Naohiro Aota | dd81d45 | 2015-06-30 11:25:43 +0900 | [diff] [blame] | 2035 | else if (key->type < (u8)-1) { |
Chris Mason | abc6e13 | 2010-03-18 12:10:08 -0400 | [diff] [blame] | 2036 | key->offset = 0; |
| 2037 | key->type++; |
Naohiro Aota | dd81d45 | 2015-06-30 11:25:43 +0900 | [diff] [blame] | 2038 | } else if (key->objectid < (u64)-1) { |
Chris Mason | abc6e13 | 2010-03-18 12:10:08 -0400 | [diff] [blame] | 2039 | key->offset = 0; |
| 2040 | key->type = 0; |
| 2041 | key->objectid++; |
| 2042 | } else |
| 2043 | ret = 1; |
Gerhard Heift | 25c9bc2 | 2014-01-30 16:23:57 +0100 | [diff] [blame] | 2044 | out: |
Gerhard Heift | ba346b3 | 2014-01-30 16:24:02 +0100 | [diff] [blame] | 2045 | /* |
| 2046 | * 0: all items from this leaf copied, continue with next |
| 2047 | * 1: * more items can be copied, but unused buffer is too small |
| 2048 | * * all items were found |
| 2049 | * Either way, it will stops the loop which iterates to the next |
| 2050 | * leaf |
| 2051 | * -EOVERFLOW: item was to large for buffer |
| 2052 | * -EFAULT: could not copy extent buffer back to userspace |
| 2053 | */ |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2054 | return ret; |
| 2055 | } |
| 2056 | |
| 2057 | static noinline int search_ioctl(struct inode *inode, |
Gerhard Heift | 1254444 | 2014-01-30 16:23:58 +0100 | [diff] [blame] | 2058 | struct btrfs_ioctl_search_key *sk, |
Gerhard Heift | 9b6e817 | 2014-01-30 16:24:00 +0100 | [diff] [blame] | 2059 | size_t *buf_size, |
Gerhard Heift | ba346b3 | 2014-01-30 16:24:02 +0100 | [diff] [blame] | 2060 | char __user *ubuf) |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2061 | { |
| 2062 | struct btrfs_root *root; |
| 2063 | struct btrfs_key key; |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2064 | struct btrfs_path *path; |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2065 | struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; |
| 2066 | int ret; |
| 2067 | int num_found = 0; |
| 2068 | unsigned long sk_offset = 0; |
| 2069 | |
Gerhard Heift | 9b6e817 | 2014-01-30 16:24:00 +0100 | [diff] [blame] | 2070 | if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { |
| 2071 | *buf_size = sizeof(struct btrfs_ioctl_search_header); |
Gerhard Heift | 1254444 | 2014-01-30 16:23:58 +0100 | [diff] [blame] | 2072 | return -EOVERFLOW; |
Gerhard Heift | 9b6e817 | 2014-01-30 16:24:00 +0100 | [diff] [blame] | 2073 | } |
Gerhard Heift | 1254444 | 2014-01-30 16:23:58 +0100 | [diff] [blame] | 2074 | |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2075 | path = btrfs_alloc_path(); |
| 2076 | if (!path) |
| 2077 | return -ENOMEM; |
| 2078 | |
| 2079 | if (sk->tree_id == 0) { |
| 2080 | /* search the root of the inode that was passed */ |
| 2081 | root = BTRFS_I(inode)->root; |
| 2082 | } else { |
| 2083 | key.objectid = sk->tree_id; |
| 2084 | key.type = BTRFS_ROOT_ITEM_KEY; |
| 2085 | key.offset = (u64)-1; |
| 2086 | root = btrfs_read_fs_root_no_name(info, &key); |
| 2087 | if (IS_ERR(root)) { |
David Sterba | f14d104 | 2015-10-08 11:37:06 +0200 | [diff] [blame] | 2088 | btrfs_err(info, "could not find root %llu", |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2089 | sk->tree_id); |
| 2090 | btrfs_free_path(path); |
| 2091 | return -ENOENT; |
| 2092 | } |
| 2093 | } |
| 2094 | |
| 2095 | key.objectid = sk->min_objectid; |
| 2096 | key.type = sk->min_type; |
| 2097 | key.offset = sk->min_offset; |
| 2098 | |
Dulshani Gunawardhana | 6787125 | 2013-10-31 10:33:04 +0530 | [diff] [blame] | 2099 | while (1) { |
Filipe David Borba Manana | 6174d3c | 2013-10-01 16:13:42 +0100 | [diff] [blame] | 2100 | ret = btrfs_search_forward(root, &key, path, sk->min_transid); |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2101 | if (ret != 0) { |
| 2102 | if (ret > 0) |
| 2103 | ret = 0; |
| 2104 | goto err; |
| 2105 | } |
Gerhard Heift | ba346b3 | 2014-01-30 16:24:02 +0100 | [diff] [blame] | 2106 | ret = copy_to_sk(root, path, &key, sk, buf_size, ubuf, |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2107 | &sk_offset, &num_found); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 2108 | btrfs_release_path(path); |
Gerhard Heift | 25c9bc2 | 2014-01-30 16:23:57 +0100 | [diff] [blame] | 2109 | if (ret) |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2110 | break; |
| 2111 | |
| 2112 | } |
Gerhard Heift | 8f5f617 | 2014-01-30 16:23:59 +0100 | [diff] [blame] | 2113 | if (ret > 0) |
| 2114 | ret = 0; |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2115 | err: |
| 2116 | sk->nr_items = num_found; |
| 2117 | btrfs_free_path(path); |
| 2118 | return ret; |
| 2119 | } |
| 2120 | |
| 2121 | static noinline int btrfs_ioctl_tree_search(struct file *file, |
| 2122 | void __user *argp) |
| 2123 | { |
Gerhard Heift | ba346b3 | 2014-01-30 16:24:02 +0100 | [diff] [blame] | 2124 | struct btrfs_ioctl_search_args __user *uargs; |
| 2125 | struct btrfs_ioctl_search_key sk; |
Gerhard Heift | 9b6e817 | 2014-01-30 16:24:00 +0100 | [diff] [blame] | 2126 | struct inode *inode; |
| 2127 | int ret; |
| 2128 | size_t buf_size; |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2129 | |
| 2130 | if (!capable(CAP_SYS_ADMIN)) |
| 2131 | return -EPERM; |
| 2132 | |
Gerhard Heift | ba346b3 | 2014-01-30 16:24:02 +0100 | [diff] [blame] | 2133 | uargs = (struct btrfs_ioctl_search_args __user *)argp; |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2134 | |
Gerhard Heift | ba346b3 | 2014-01-30 16:24:02 +0100 | [diff] [blame] | 2135 | if (copy_from_user(&sk, &uargs->key, sizeof(sk))) |
| 2136 | return -EFAULT; |
| 2137 | |
| 2138 | buf_size = sizeof(uargs->buf); |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2139 | |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 2140 | inode = file_inode(file); |
Gerhard Heift | ba346b3 | 2014-01-30 16:24:02 +0100 | [diff] [blame] | 2141 | ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); |
Gerhard Heift | 8f5f617 | 2014-01-30 16:23:59 +0100 | [diff] [blame] | 2142 | |
| 2143 | /* |
| 2144 | * In the origin implementation an overflow is handled by returning a |
| 2145 | * search header with a len of zero, so reset ret. |
| 2146 | */ |
| 2147 | if (ret == -EOVERFLOW) |
| 2148 | ret = 0; |
| 2149 | |
Gerhard Heift | ba346b3 | 2014-01-30 16:24:02 +0100 | [diff] [blame] | 2150 | if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2151 | ret = -EFAULT; |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2152 | return ret; |
| 2153 | } |
| 2154 | |
Gerhard Heift | cc68a8a | 2014-01-30 16:24:03 +0100 | [diff] [blame] | 2155 | static noinline int btrfs_ioctl_tree_search_v2(struct file *file, |
| 2156 | void __user *argp) |
| 2157 | { |
| 2158 | struct btrfs_ioctl_search_args_v2 __user *uarg; |
| 2159 | struct btrfs_ioctl_search_args_v2 args; |
| 2160 | struct inode *inode; |
| 2161 | int ret; |
| 2162 | size_t buf_size; |
| 2163 | const size_t buf_limit = 16 * 1024 * 1024; |
| 2164 | |
| 2165 | if (!capable(CAP_SYS_ADMIN)) |
| 2166 | return -EPERM; |
| 2167 | |
| 2168 | /* copy search header and buffer size */ |
| 2169 | uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp; |
| 2170 | if (copy_from_user(&args, uarg, sizeof(args))) |
| 2171 | return -EFAULT; |
| 2172 | |
| 2173 | buf_size = args.buf_size; |
| 2174 | |
| 2175 | if (buf_size < sizeof(struct btrfs_ioctl_search_header)) |
| 2176 | return -EOVERFLOW; |
| 2177 | |
| 2178 | /* limit result size to 16MB */ |
| 2179 | if (buf_size > buf_limit) |
| 2180 | buf_size = buf_limit; |
| 2181 | |
| 2182 | inode = file_inode(file); |
| 2183 | ret = search_ioctl(inode, &args.key, &buf_size, |
| 2184 | (char *)(&uarg->buf[0])); |
| 2185 | if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) |
| 2186 | ret = -EFAULT; |
| 2187 | else if (ret == -EOVERFLOW && |
| 2188 | copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) |
| 2189 | ret = -EFAULT; |
| 2190 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2191 | return ret; |
| 2192 | } |
| 2193 | |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 2194 | /* |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2195 | * Search INODE_REFs to identify path name of 'dirid' directory |
| 2196 | * in a 'tree_id' tree. and sets path name to 'name'. |
| 2197 | */ |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 2198 | static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, |
| 2199 | u64 tree_id, u64 dirid, char *name) |
| 2200 | { |
| 2201 | struct btrfs_root *root; |
| 2202 | struct btrfs_key key; |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2203 | char *ptr; |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 2204 | int ret = -1; |
| 2205 | int slot; |
| 2206 | int len; |
| 2207 | int total_len = 0; |
| 2208 | struct btrfs_inode_ref *iref; |
| 2209 | struct extent_buffer *l; |
| 2210 | struct btrfs_path *path; |
| 2211 | |
| 2212 | if (dirid == BTRFS_FIRST_FREE_OBJECTID) { |
| 2213 | name[0]='\0'; |
| 2214 | return 0; |
| 2215 | } |
| 2216 | |
| 2217 | path = btrfs_alloc_path(); |
| 2218 | if (!path) |
| 2219 | return -ENOMEM; |
| 2220 | |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2221 | ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 2222 | |
| 2223 | key.objectid = tree_id; |
| 2224 | key.type = BTRFS_ROOT_ITEM_KEY; |
| 2225 | key.offset = (u64)-1; |
| 2226 | root = btrfs_read_fs_root_no_name(info, &key); |
| 2227 | if (IS_ERR(root)) { |
David Sterba | f14d104 | 2015-10-08 11:37:06 +0200 | [diff] [blame] | 2228 | btrfs_err(info, "could not find root %llu", tree_id); |
Chris Mason | 8ad6fca | 2010-03-18 12:23:10 -0400 | [diff] [blame] | 2229 | ret = -ENOENT; |
| 2230 | goto out; |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 2231 | } |
| 2232 | |
| 2233 | key.objectid = dirid; |
| 2234 | key.type = BTRFS_INODE_REF_KEY; |
Chris Mason | 8ad6fca | 2010-03-18 12:23:10 -0400 | [diff] [blame] | 2235 | key.offset = (u64)-1; |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 2236 | |
Dulshani Gunawardhana | 6787125 | 2013-10-31 10:33:04 +0530 | [diff] [blame] | 2237 | while (1) { |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 2238 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 2239 | if (ret < 0) |
| 2240 | goto out; |
Filipe David Borba Manana | 18674c6 | 2013-08-14 03:00:21 +0100 | [diff] [blame] | 2241 | else if (ret > 0) { |
| 2242 | ret = btrfs_previous_item(root, path, dirid, |
| 2243 | BTRFS_INODE_REF_KEY); |
| 2244 | if (ret < 0) |
| 2245 | goto out; |
| 2246 | else if (ret > 0) { |
| 2247 | ret = -ENOENT; |
| 2248 | goto out; |
| 2249 | } |
| 2250 | } |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 2251 | |
| 2252 | l = path->nodes[0]; |
| 2253 | slot = path->slots[0]; |
| 2254 | btrfs_item_key_to_cpu(l, &key, slot); |
| 2255 | |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 2256 | iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); |
| 2257 | len = btrfs_inode_ref_name_len(l, iref); |
| 2258 | ptr -= len + 1; |
| 2259 | total_len += len + 1; |
Filipe David Borba Manana | a696cf3 | 2013-08-14 03:00:20 +0100 | [diff] [blame] | 2260 | if (ptr < name) { |
| 2261 | ret = -ENAMETOOLONG; |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 2262 | goto out; |
Filipe David Borba Manana | a696cf3 | 2013-08-14 03:00:20 +0100 | [diff] [blame] | 2263 | } |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 2264 | |
| 2265 | *(ptr + len) = '/'; |
Dulshani Gunawardhana | 6787125 | 2013-10-31 10:33:04 +0530 | [diff] [blame] | 2266 | read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 2267 | |
| 2268 | if (key.offset == BTRFS_FIRST_FREE_OBJECTID) |
| 2269 | break; |
| 2270 | |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 2271 | btrfs_release_path(path); |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 2272 | key.objectid = key.offset; |
Chris Mason | 8ad6fca | 2010-03-18 12:23:10 -0400 | [diff] [blame] | 2273 | key.offset = (u64)-1; |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 2274 | dirid = key.objectid; |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 2275 | } |
Li Zefan | 77906a50 | 2011-07-14 03:16:00 +0000 | [diff] [blame] | 2276 | memmove(name, ptr, total_len); |
Dulshani Gunawardhana | 6787125 | 2013-10-31 10:33:04 +0530 | [diff] [blame] | 2277 | name[total_len] = '\0'; |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 2278 | ret = 0; |
| 2279 | out: |
| 2280 | btrfs_free_path(path); |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2281 | return ret; |
| 2282 | } |
| 2283 | |
| 2284 | static noinline int btrfs_ioctl_ino_lookup(struct file *file, |
| 2285 | void __user *argp) |
| 2286 | { |
| 2287 | struct btrfs_ioctl_ino_lookup_args *args; |
| 2288 | struct inode *inode; |
David Sterba | 01b810b | 2015-05-12 19:14:49 +0200 | [diff] [blame] | 2289 | int ret = 0; |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2290 | |
Julia Lawall | 2354d08 | 2010-10-29 15:14:18 -0400 | [diff] [blame] | 2291 | args = memdup_user(argp, sizeof(*args)); |
| 2292 | if (IS_ERR(args)) |
| 2293 | return PTR_ERR(args); |
Dan Carpenter | c2b9692 | 2010-03-20 11:24:15 +0000 | [diff] [blame] | 2294 | |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 2295 | inode = file_inode(file); |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2296 | |
David Sterba | 01b810b | 2015-05-12 19:14:49 +0200 | [diff] [blame] | 2297 | /* |
| 2298 | * Unprivileged query to obtain the containing subvolume root id. The |
| 2299 | * path is reset so it's consistent with btrfs_search_path_in_tree. |
| 2300 | */ |
Chris Mason | 1b53ac4 | 2010-03-18 12:17:05 -0400 | [diff] [blame] | 2301 | if (args->treeid == 0) |
| 2302 | args->treeid = BTRFS_I(inode)->root->root_key.objectid; |
| 2303 | |
David Sterba | 01b810b | 2015-05-12 19:14:49 +0200 | [diff] [blame] | 2304 | if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { |
| 2305 | args->name[0] = 0; |
| 2306 | goto out; |
| 2307 | } |
| 2308 | |
| 2309 | if (!capable(CAP_SYS_ADMIN)) { |
| 2310 | ret = -EPERM; |
| 2311 | goto out; |
| 2312 | } |
| 2313 | |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2314 | ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, |
| 2315 | args->treeid, args->objectid, |
| 2316 | args->name); |
| 2317 | |
David Sterba | 01b810b | 2015-05-12 19:14:49 +0200 | [diff] [blame] | 2318 | out: |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2319 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) |
| 2320 | ret = -EFAULT; |
| 2321 | |
| 2322 | kfree(args); |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 2323 | return ret; |
| 2324 | } |
| 2325 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2326 | static noinline int btrfs_ioctl_snap_destroy(struct file *file, |
| 2327 | void __user *arg) |
| 2328 | { |
Al Viro | 54563d4 | 2013-09-01 15:57:51 -0400 | [diff] [blame] | 2329 | struct dentry *parent = file->f_path.dentry; |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2330 | struct dentry *dentry; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 2331 | struct inode *dir = d_inode(parent); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2332 | struct inode *inode; |
| 2333 | struct btrfs_root *root = BTRFS_I(dir)->root; |
| 2334 | struct btrfs_root *dest = NULL; |
| 2335 | struct btrfs_ioctl_vol_args *vol_args; |
| 2336 | struct btrfs_trans_handle *trans; |
Miao Xie | c58aaad | 2013-02-28 10:05:36 +0000 | [diff] [blame] | 2337 | struct btrfs_block_rsv block_rsv; |
David Sterba | 521e054 | 2014-04-15 16:41:44 +0200 | [diff] [blame] | 2338 | u64 root_flags; |
Miao Xie | c58aaad | 2013-02-28 10:05:36 +0000 | [diff] [blame] | 2339 | u64 qgroup_reserved; |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2340 | int namelen; |
| 2341 | int ret; |
| 2342 | int err = 0; |
| 2343 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2344 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
| 2345 | if (IS_ERR(vol_args)) |
| 2346 | return PTR_ERR(vol_args); |
| 2347 | |
| 2348 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
| 2349 | namelen = strlen(vol_args->name); |
| 2350 | if (strchr(vol_args->name, '/') || |
| 2351 | strncmp(vol_args->name, "..", namelen) == 0) { |
| 2352 | err = -EINVAL; |
| 2353 | goto out; |
| 2354 | } |
| 2355 | |
Al Viro | a561be7 | 2011-11-23 11:57:51 -0500 | [diff] [blame] | 2356 | err = mnt_want_write_file(file); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2357 | if (err) |
| 2358 | goto out; |
| 2359 | |
David Sterba | 521e054 | 2014-04-15 16:41:44 +0200 | [diff] [blame] | 2360 | |
David Sterba | 5c50c9b | 2013-03-22 18:12:51 +0000 | [diff] [blame] | 2361 | err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); |
| 2362 | if (err == -EINTR) |
David Sterba | e43f998 | 2013-12-06 17:51:32 +0100 | [diff] [blame] | 2363 | goto out_drop_write; |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2364 | dentry = lookup_one_len(vol_args->name, parent, namelen); |
| 2365 | if (IS_ERR(dentry)) { |
| 2366 | err = PTR_ERR(dentry); |
| 2367 | goto out_unlock_dir; |
| 2368 | } |
| 2369 | |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 2370 | if (d_really_is_negative(dentry)) { |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2371 | err = -ENOENT; |
| 2372 | goto out_dput; |
| 2373 | } |
| 2374 | |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 2375 | inode = d_inode(dentry); |
Sage Weil | 4260f7c | 2010-10-29 15:46:43 -0400 | [diff] [blame] | 2376 | dest = BTRFS_I(inode)->root; |
Dulshani Gunawardhana | 6787125 | 2013-10-31 10:33:04 +0530 | [diff] [blame] | 2377 | if (!capable(CAP_SYS_ADMIN)) { |
Sage Weil | 4260f7c | 2010-10-29 15:46:43 -0400 | [diff] [blame] | 2378 | /* |
| 2379 | * Regular user. Only allow this with a special mount |
| 2380 | * option, when the user has write+exec access to the |
| 2381 | * subvol root, and when rmdir(2) would have been |
| 2382 | * allowed. |
| 2383 | * |
| 2384 | * Note that this is _not_ check that the subvol is |
| 2385 | * empty or doesn't contain data that we wouldn't |
| 2386 | * otherwise be able to delete. |
| 2387 | * |
| 2388 | * Users who want to delete empty subvols should try |
| 2389 | * rmdir(2). |
| 2390 | */ |
| 2391 | err = -EPERM; |
| 2392 | if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) |
| 2393 | goto out_dput; |
| 2394 | |
| 2395 | /* |
| 2396 | * Do not allow deletion if the parent dir is the same |
| 2397 | * as the dir to be deleted. That means the ioctl |
| 2398 | * must be called on the dentry referencing the root |
| 2399 | * of the subvol, not a random directory contained |
| 2400 | * within it. |
| 2401 | */ |
| 2402 | err = -EINVAL; |
| 2403 | if (root == dest) |
| 2404 | goto out_dput; |
| 2405 | |
| 2406 | err = inode_permission(inode, MAY_WRITE | MAY_EXEC); |
| 2407 | if (err) |
| 2408 | goto out_dput; |
Sage Weil | 4260f7c | 2010-10-29 15:46:43 -0400 | [diff] [blame] | 2409 | } |
| 2410 | |
Miao Xie | 5c39da5 | 2012-10-22 11:39:53 +0000 | [diff] [blame] | 2411 | /* check if subvolume may be deleted by a user */ |
| 2412 | err = btrfs_may_delete(dir, dentry, 1); |
| 2413 | if (err) |
| 2414 | goto out_dput; |
| 2415 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2416 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2417 | err = -EINVAL; |
| 2418 | goto out_dput; |
| 2419 | } |
| 2420 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2421 | mutex_lock(&inode->i_mutex); |
David Sterba | 521e054 | 2014-04-15 16:41:44 +0200 | [diff] [blame] | 2422 | |
| 2423 | /* |
| 2424 | * Don't allow to delete a subvolume with send in progress. This is |
| 2425 | * inside the i_mutex so the error handling that has to drop the bit |
| 2426 | * again is not run concurrently. |
| 2427 | */ |
| 2428 | spin_lock(&dest->root_item_lock); |
Filipe Manana | c55bfa6 | 2014-05-25 03:55:44 +0100 | [diff] [blame] | 2429 | root_flags = btrfs_root_flags(&dest->root_item); |
| 2430 | if (dest->send_in_progress == 0) { |
| 2431 | btrfs_set_root_flags(&dest->root_item, |
David Sterba | 521e054 | 2014-04-15 16:41:44 +0200 | [diff] [blame] | 2432 | root_flags | BTRFS_ROOT_SUBVOL_DEAD); |
| 2433 | spin_unlock(&dest->root_item_lock); |
| 2434 | } else { |
| 2435 | spin_unlock(&dest->root_item_lock); |
| 2436 | btrfs_warn(root->fs_info, |
| 2437 | "Attempt to delete subvolume %llu during send", |
Filipe Manana | c55bfa6 | 2014-05-25 03:55:44 +0100 | [diff] [blame] | 2438 | dest->root_key.objectid); |
David Sterba | 521e054 | 2014-04-15 16:41:44 +0200 | [diff] [blame] | 2439 | err = -EPERM; |
Omar Sandoval | 909e26d | 2015-04-10 14:20:40 -0700 | [diff] [blame] | 2440 | goto out_unlock_inode; |
David Sterba | 521e054 | 2014-04-15 16:41:44 +0200 | [diff] [blame] | 2441 | } |
| 2442 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2443 | down_write(&root->fs_info->subvol_sem); |
| 2444 | |
| 2445 | err = may_destroy_subvol(dest); |
| 2446 | if (err) |
| 2447 | goto out_up_write; |
| 2448 | |
Miao Xie | c58aaad | 2013-02-28 10:05:36 +0000 | [diff] [blame] | 2449 | btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); |
| 2450 | /* |
| 2451 | * One for dir inode, two for dir entries, two for root |
| 2452 | * ref/backref. |
| 2453 | */ |
| 2454 | err = btrfs_subvolume_reserve_metadata(root, &block_rsv, |
Jeff Mahoney | ee3441b | 2013-07-09 16:37:21 -0400 | [diff] [blame] | 2455 | 5, &qgroup_reserved, true); |
Miao Xie | c58aaad | 2013-02-28 10:05:36 +0000 | [diff] [blame] | 2456 | if (err) |
| 2457 | goto out_up_write; |
| 2458 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2459 | trans = btrfs_start_transaction(root, 0); |
| 2460 | if (IS_ERR(trans)) { |
| 2461 | err = PTR_ERR(trans); |
Miao Xie | c58aaad | 2013-02-28 10:05:36 +0000 | [diff] [blame] | 2462 | goto out_release; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2463 | } |
Miao Xie | c58aaad | 2013-02-28 10:05:36 +0000 | [diff] [blame] | 2464 | trans->block_rsv = &block_rsv; |
| 2465 | trans->bytes_reserved = block_rsv.size; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2466 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2467 | ret = btrfs_unlink_subvol(trans, root, dir, |
| 2468 | dest->root_key.objectid, |
| 2469 | dentry->d_name.name, |
| 2470 | dentry->d_name.len); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2471 | if (ret) { |
| 2472 | err = ret; |
| 2473 | btrfs_abort_transaction(trans, root, ret); |
| 2474 | goto out_end_trans; |
| 2475 | } |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2476 | |
| 2477 | btrfs_record_root_in_trans(trans, dest); |
| 2478 | |
| 2479 | memset(&dest->root_item.drop_progress, 0, |
| 2480 | sizeof(dest->root_item.drop_progress)); |
| 2481 | dest->root_item.drop_level = 0; |
| 2482 | btrfs_set_root_refs(&dest->root_item, 0); |
| 2483 | |
Miao Xie | 27cdeb7 | 2014-04-02 19:51:05 +0800 | [diff] [blame] | 2484 | if (!test_and_set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &dest->state)) { |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2485 | ret = btrfs_insert_orphan_item(trans, |
| 2486 | root->fs_info->tree_root, |
| 2487 | dest->root_key.objectid); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2488 | if (ret) { |
| 2489 | btrfs_abort_transaction(trans, root, ret); |
| 2490 | err = ret; |
| 2491 | goto out_end_trans; |
| 2492 | } |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2493 | } |
Stefan Behrens | dd5f961 | 2013-08-15 17:11:20 +0200 | [diff] [blame] | 2494 | |
| 2495 | ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, |
| 2496 | dest->root_item.uuid, BTRFS_UUID_KEY_SUBVOL, |
| 2497 | dest->root_key.objectid); |
| 2498 | if (ret && ret != -ENOENT) { |
| 2499 | btrfs_abort_transaction(trans, root, ret); |
| 2500 | err = ret; |
| 2501 | goto out_end_trans; |
| 2502 | } |
| 2503 | if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) { |
| 2504 | ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, |
| 2505 | dest->root_item.received_uuid, |
| 2506 | BTRFS_UUID_KEY_RECEIVED_SUBVOL, |
| 2507 | dest->root_key.objectid); |
| 2508 | if (ret && ret != -ENOENT) { |
| 2509 | btrfs_abort_transaction(trans, root, ret); |
| 2510 | err = ret; |
| 2511 | goto out_end_trans; |
| 2512 | } |
| 2513 | } |
| 2514 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2515 | out_end_trans: |
Miao Xie | c58aaad | 2013-02-28 10:05:36 +0000 | [diff] [blame] | 2516 | trans->block_rsv = NULL; |
| 2517 | trans->bytes_reserved = 0; |
Sage Weil | 531cb13 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 2518 | ret = btrfs_end_transaction(trans, root); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2519 | if (ret && !err) |
| 2520 | err = ret; |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2521 | inode->i_flags |= S_DEAD; |
Miao Xie | c58aaad | 2013-02-28 10:05:36 +0000 | [diff] [blame] | 2522 | out_release: |
| 2523 | btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2524 | out_up_write: |
| 2525 | up_write(&root->fs_info->subvol_sem); |
David Sterba | 521e054 | 2014-04-15 16:41:44 +0200 | [diff] [blame] | 2526 | if (err) { |
| 2527 | spin_lock(&dest->root_item_lock); |
Filipe Manana | c55bfa6 | 2014-05-25 03:55:44 +0100 | [diff] [blame] | 2528 | root_flags = btrfs_root_flags(&dest->root_item); |
| 2529 | btrfs_set_root_flags(&dest->root_item, |
David Sterba | 521e054 | 2014-04-15 16:41:44 +0200 | [diff] [blame] | 2530 | root_flags & ~BTRFS_ROOT_SUBVOL_DEAD); |
| 2531 | spin_unlock(&dest->root_item_lock); |
| 2532 | } |
Omar Sandoval | 909e26d | 2015-04-10 14:20:40 -0700 | [diff] [blame] | 2533 | out_unlock_inode: |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2534 | mutex_unlock(&inode->i_mutex); |
| 2535 | if (!err) { |
Omar Sandoval | 64ad6c4 | 2015-06-02 17:31:00 -0700 | [diff] [blame] | 2536 | d_invalidate(dentry); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2537 | btrfs_invalidate_inodes(dest); |
| 2538 | d_delete(dentry); |
David Sterba | 61155aa | 2014-04-15 16:42:03 +0200 | [diff] [blame] | 2539 | ASSERT(dest->send_in_progress == 0); |
Liu Bo | fa6ac87 | 2013-02-20 14:10:23 +0000 | [diff] [blame] | 2540 | |
| 2541 | /* the last ref */ |
David Sterba | 57cdc8d | 2014-02-05 02:37:48 +0100 | [diff] [blame] | 2542 | if (dest->ino_cache_inode) { |
| 2543 | iput(dest->ino_cache_inode); |
| 2544 | dest->ino_cache_inode = NULL; |
Liu Bo | fa6ac87 | 2013-02-20 14:10:23 +0000 | [diff] [blame] | 2545 | } |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2546 | } |
| 2547 | out_dput: |
| 2548 | dput(dentry); |
| 2549 | out_unlock_dir: |
| 2550 | mutex_unlock(&dir->i_mutex); |
David Sterba | e43f998 | 2013-12-06 17:51:32 +0100 | [diff] [blame] | 2551 | out_drop_write: |
Al Viro | 2a79f17 | 2011-12-09 08:06:57 -0500 | [diff] [blame] | 2552 | mnt_drop_write_file(file); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2553 | out: |
| 2554 | kfree(vol_args); |
| 2555 | return err; |
| 2556 | } |
| 2557 | |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 2558 | static int btrfs_ioctl_defrag(struct file *file, void __user *argp) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2559 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 2560 | struct inode *inode = file_inode(file); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2561 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 2562 | struct btrfs_ioctl_defrag_range_args *range; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 2563 | int ret; |
| 2564 | |
Ilya Dryomov | 25122d1 | 2013-01-20 15:57:57 +0200 | [diff] [blame] | 2565 | ret = mnt_want_write_file(file); |
| 2566 | if (ret) |
| 2567 | return ret; |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 2568 | |
Ilya Dryomov | 25122d1 | 2013-01-20 15:57:57 +0200 | [diff] [blame] | 2569 | if (btrfs_root_readonly(root)) { |
| 2570 | ret = -EROFS; |
| 2571 | goto out; |
Stefan Behrens | 5ac00ad | 2012-11-05 17:54:08 +0100 | [diff] [blame] | 2572 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2573 | |
| 2574 | switch (inode->i_mode & S_IFMT) { |
| 2575 | case S_IFDIR: |
Chris Mason | e441d54 | 2009-01-05 16:57:23 -0500 | [diff] [blame] | 2576 | if (!capable(CAP_SYS_ADMIN)) { |
| 2577 | ret = -EPERM; |
| 2578 | goto out; |
| 2579 | } |
Eric Sandeen | de78b51 | 2013-01-31 18:21:12 +0000 | [diff] [blame] | 2580 | ret = btrfs_defrag_root(root); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2581 | if (ret) |
| 2582 | goto out; |
Eric Sandeen | de78b51 | 2013-01-31 18:21:12 +0000 | [diff] [blame] | 2583 | ret = btrfs_defrag_root(root->fs_info->extent_root); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2584 | break; |
| 2585 | case S_IFREG: |
Chris Mason | e441d54 | 2009-01-05 16:57:23 -0500 | [diff] [blame] | 2586 | if (!(file->f_mode & FMODE_WRITE)) { |
| 2587 | ret = -EINVAL; |
| 2588 | goto out; |
| 2589 | } |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 2590 | |
| 2591 | range = kzalloc(sizeof(*range), GFP_KERNEL); |
| 2592 | if (!range) { |
| 2593 | ret = -ENOMEM; |
| 2594 | goto out; |
| 2595 | } |
| 2596 | |
| 2597 | if (argp) { |
| 2598 | if (copy_from_user(range, argp, |
| 2599 | sizeof(*range))) { |
| 2600 | ret = -EFAULT; |
| 2601 | kfree(range); |
Dan Carpenter | 683be16 | 2010-03-20 11:24:48 +0000 | [diff] [blame] | 2602 | goto out; |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 2603 | } |
| 2604 | /* compression requires us to start the IO */ |
| 2605 | if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { |
| 2606 | range->flags |= BTRFS_DEFRAG_RANGE_START_IO; |
| 2607 | range->extent_thresh = (u32)-1; |
| 2608 | } |
| 2609 | } else { |
| 2610 | /* the rest are all set to zero by kzalloc */ |
| 2611 | range->len = (u64)-1; |
| 2612 | } |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 2613 | ret = btrfs_defrag_file(file_inode(file), file, |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 2614 | range, 0, 0); |
| 2615 | if (ret > 0) |
| 2616 | ret = 0; |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 2617 | kfree(range); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2618 | break; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2619 | default: |
| 2620 | ret = -EINVAL; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2621 | } |
Chris Mason | e441d54 | 2009-01-05 16:57:23 -0500 | [diff] [blame] | 2622 | out: |
Ilya Dryomov | 25122d1 | 2013-01-20 15:57:57 +0200 | [diff] [blame] | 2623 | mnt_drop_write_file(file); |
Chris Mason | e441d54 | 2009-01-05 16:57:23 -0500 | [diff] [blame] | 2624 | return ret; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2625 | } |
| 2626 | |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 2627 | static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2628 | { |
| 2629 | struct btrfs_ioctl_vol_args *vol_args; |
| 2630 | int ret; |
| 2631 | |
Chris Mason | e441d54 | 2009-01-05 16:57:23 -0500 | [diff] [blame] | 2632 | if (!capable(CAP_SYS_ADMIN)) |
| 2633 | return -EPERM; |
| 2634 | |
Stefan Behrens | 5ac00ad | 2012-11-05 17:54:08 +0100 | [diff] [blame] | 2635 | if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, |
| 2636 | 1)) { |
Anand Jain | e57138b | 2013-08-21 11:44:48 +0800 | [diff] [blame] | 2637 | return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 2638 | } |
| 2639 | |
Stefan Behrens | 5ac00ad | 2012-11-05 17:54:08 +0100 | [diff] [blame] | 2640 | mutex_lock(&root->fs_info->volume_mutex); |
Li Zefan | dae7b66 | 2009-04-08 15:06:54 +0800 | [diff] [blame] | 2641 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 2642 | if (IS_ERR(vol_args)) { |
| 2643 | ret = PTR_ERR(vol_args); |
| 2644 | goto out; |
| 2645 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2646 | |
Mark Fasheh | 5516e59 | 2008-07-24 12:20:14 -0400 | [diff] [blame] | 2647 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2648 | ret = btrfs_init_new_device(root, vol_args->name); |
| 2649 | |
Anand Jain | 43d2076 | 2014-07-01 00:58:56 +0800 | [diff] [blame] | 2650 | if (!ret) |
| 2651 | btrfs_info(root->fs_info, "disk added %s",vol_args->name); |
| 2652 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2653 | kfree(vol_args); |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 2654 | out: |
| 2655 | mutex_unlock(&root->fs_info->volume_mutex); |
Stefan Behrens | 5ac00ad | 2012-11-05 17:54:08 +0100 | [diff] [blame] | 2656 | atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2657 | return ret; |
| 2658 | } |
| 2659 | |
Miao Xie | da24927 | 2012-11-26 08:44:50 +0000 | [diff] [blame] | 2660 | static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2661 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 2662 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2663 | struct btrfs_ioctl_vol_args *vol_args; |
| 2664 | int ret; |
| 2665 | |
Chris Mason | e441d54 | 2009-01-05 16:57:23 -0500 | [diff] [blame] | 2666 | if (!capable(CAP_SYS_ADMIN)) |
| 2667 | return -EPERM; |
| 2668 | |
Miao Xie | da24927 | 2012-11-26 08:44:50 +0000 | [diff] [blame] | 2669 | ret = mnt_want_write_file(file); |
| 2670 | if (ret) |
| 2671 | return ret; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 2672 | |
Li Zefan | dae7b66 | 2009-04-08 15:06:54 +0800 | [diff] [blame] | 2673 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 2674 | if (IS_ERR(vol_args)) { |
| 2675 | ret = PTR_ERR(vol_args); |
Dan Carpenter | c47ca32 | 2014-09-04 14:09:15 +0300 | [diff] [blame] | 2676 | goto err_drop; |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 2677 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2678 | |
Mark Fasheh | 5516e59 | 2008-07-24 12:20:14 -0400 | [diff] [blame] | 2679 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2680 | |
Anand Jain | 183860f | 2013-05-17 10:52:45 +0000 | [diff] [blame] | 2681 | if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, |
| 2682 | 1)) { |
| 2683 | ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
| 2684 | goto out; |
| 2685 | } |
| 2686 | |
| 2687 | mutex_lock(&root->fs_info->volume_mutex); |
| 2688 | ret = btrfs_rm_device(root, vol_args->name); |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 2689 | mutex_unlock(&root->fs_info->volume_mutex); |
Stefan Behrens | 5ac00ad | 2012-11-05 17:54:08 +0100 | [diff] [blame] | 2690 | atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); |
Anand Jain | 183860f | 2013-05-17 10:52:45 +0000 | [diff] [blame] | 2691 | |
Anand Jain | ec95d49 | 2014-07-01 00:58:57 +0800 | [diff] [blame] | 2692 | if (!ret) |
| 2693 | btrfs_info(root->fs_info, "disk deleted %s",vol_args->name); |
| 2694 | |
Anand Jain | 183860f | 2013-05-17 10:52:45 +0000 | [diff] [blame] | 2695 | out: |
| 2696 | kfree(vol_args); |
Dan Carpenter | c47ca32 | 2014-09-04 14:09:15 +0300 | [diff] [blame] | 2697 | err_drop: |
Ilya Dryomov | 4ac20c7 | 2013-01-20 15:57:57 +0200 | [diff] [blame] | 2698 | mnt_drop_write_file(file); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2699 | return ret; |
| 2700 | } |
| 2701 | |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 2702 | static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) |
| 2703 | { |
Li Zefan | 027ed2f | 2011-06-08 08:27:56 +0000 | [diff] [blame] | 2704 | struct btrfs_ioctl_fs_info_args *fi_args; |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 2705 | struct btrfs_device *device; |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 2706 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; |
Li Zefan | 027ed2f | 2011-06-08 08:27:56 +0000 | [diff] [blame] | 2707 | int ret = 0; |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 2708 | |
Li Zefan | 027ed2f | 2011-06-08 08:27:56 +0000 | [diff] [blame] | 2709 | fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); |
| 2710 | if (!fi_args) |
| 2711 | return -ENOMEM; |
| 2712 | |
Filipe David Borba Manana | f717175 | 2013-08-12 20:56:58 +0100 | [diff] [blame] | 2713 | mutex_lock(&fs_devices->device_list_mutex); |
Li Zefan | 027ed2f | 2011-06-08 08:27:56 +0000 | [diff] [blame] | 2714 | fi_args->num_devices = fs_devices->num_devices; |
| 2715 | memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid)); |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 2716 | |
Byongho Lee | d7641a4 | 2015-09-01 23:10:57 +0900 | [diff] [blame] | 2717 | list_for_each_entry(device, &fs_devices->devices, dev_list) { |
Li Zefan | 027ed2f | 2011-06-08 08:27:56 +0000 | [diff] [blame] | 2718 | if (device->devid > fi_args->max_id) |
| 2719 | fi_args->max_id = device->devid; |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 2720 | } |
| 2721 | mutex_unlock(&fs_devices->device_list_mutex); |
| 2722 | |
David Sterba | 80a773f | 2014-05-07 18:17:06 +0200 | [diff] [blame] | 2723 | fi_args->nodesize = root->fs_info->super_copy->nodesize; |
| 2724 | fi_args->sectorsize = root->fs_info->super_copy->sectorsize; |
| 2725 | fi_args->clone_alignment = root->fs_info->super_copy->sectorsize; |
| 2726 | |
Li Zefan | 027ed2f | 2011-06-08 08:27:56 +0000 | [diff] [blame] | 2727 | if (copy_to_user(arg, fi_args, sizeof(*fi_args))) |
| 2728 | ret = -EFAULT; |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 2729 | |
Li Zefan | 027ed2f | 2011-06-08 08:27:56 +0000 | [diff] [blame] | 2730 | kfree(fi_args); |
| 2731 | return ret; |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 2732 | } |
| 2733 | |
| 2734 | static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) |
| 2735 | { |
| 2736 | struct btrfs_ioctl_dev_info_args *di_args; |
| 2737 | struct btrfs_device *dev; |
| 2738 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; |
| 2739 | int ret = 0; |
| 2740 | char *s_uuid = NULL; |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 2741 | |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 2742 | di_args = memdup_user(arg, sizeof(*di_args)); |
| 2743 | if (IS_ERR(di_args)) |
| 2744 | return PTR_ERR(di_args); |
| 2745 | |
Stefan Behrens | dd5f961 | 2013-08-15 17:11:20 +0200 | [diff] [blame] | 2746 | if (!btrfs_is_empty_uuid(di_args->uuid)) |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 2747 | s_uuid = di_args->uuid; |
| 2748 | |
| 2749 | mutex_lock(&fs_devices->device_list_mutex); |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 2750 | dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL); |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 2751 | |
| 2752 | if (!dev) { |
| 2753 | ret = -ENODEV; |
| 2754 | goto out; |
| 2755 | } |
| 2756 | |
| 2757 | di_args->devid = dev->devid; |
Miao Xie | 7cc8e58 | 2014-09-03 21:35:38 +0800 | [diff] [blame] | 2758 | di_args->bytes_used = btrfs_device_get_bytes_used(dev); |
| 2759 | di_args->total_bytes = btrfs_device_get_total_bytes(dev); |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 2760 | memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); |
Jim Meyering | a27202f | 2012-04-26 18:36:56 +0200 | [diff] [blame] | 2761 | if (dev->name) { |
Josef Bacik | 606686e | 2012-06-04 14:03:51 -0400 | [diff] [blame] | 2762 | struct rcu_string *name; |
| 2763 | |
| 2764 | rcu_read_lock(); |
| 2765 | name = rcu_dereference(dev->name); |
| 2766 | strncpy(di_args->path, name->str, sizeof(di_args->path)); |
| 2767 | rcu_read_unlock(); |
Jim Meyering | a27202f | 2012-04-26 18:36:56 +0200 | [diff] [blame] | 2768 | di_args->path[sizeof(di_args->path) - 1] = 0; |
| 2769 | } else { |
Stefan Behrens | 99ba55a | 2012-03-19 16:17:22 +0100 | [diff] [blame] | 2770 | di_args->path[0] = '\0'; |
Jim Meyering | a27202f | 2012-04-26 18:36:56 +0200 | [diff] [blame] | 2771 | } |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 2772 | |
| 2773 | out: |
David Sterba | 55793c0 | 2013-04-26 15:20:23 +0000 | [diff] [blame] | 2774 | mutex_unlock(&fs_devices->device_list_mutex); |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 2775 | if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) |
| 2776 | ret = -EFAULT; |
| 2777 | |
| 2778 | kfree(di_args); |
| 2779 | return ret; |
| 2780 | } |
| 2781 | |
Mark Fasheh | f441460 | 2015-06-30 14:42:05 -0700 | [diff] [blame] | 2782 | static struct page *extent_same_get_page(struct inode *inode, pgoff_t index) |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2783 | { |
| 2784 | struct page *page; |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2785 | struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; |
| 2786 | |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2787 | page = grab_cache_page(inode->i_mapping, index); |
| 2788 | if (!page) |
| 2789 | return NULL; |
| 2790 | |
| 2791 | if (!PageUptodate(page)) { |
| 2792 | if (extent_read_full_page_nolock(tree, page, btrfs_get_extent, |
| 2793 | 0)) |
| 2794 | return NULL; |
| 2795 | lock_page(page); |
| 2796 | if (!PageUptodate(page)) { |
| 2797 | unlock_page(page); |
| 2798 | page_cache_release(page); |
| 2799 | return NULL; |
| 2800 | } |
| 2801 | } |
| 2802 | unlock_page(page); |
| 2803 | |
| 2804 | return page; |
| 2805 | } |
| 2806 | |
Mark Fasheh | f441460 | 2015-06-30 14:42:05 -0700 | [diff] [blame] | 2807 | static int gather_extent_pages(struct inode *inode, struct page **pages, |
| 2808 | int num_pages, u64 off) |
| 2809 | { |
| 2810 | int i; |
| 2811 | pgoff_t index = off >> PAGE_CACHE_SHIFT; |
| 2812 | |
| 2813 | for (i = 0; i < num_pages; i++) { |
| 2814 | pages[i] = extent_same_get_page(inode, index + i); |
| 2815 | if (!pages[i]) |
| 2816 | return -ENOMEM; |
| 2817 | } |
| 2818 | return 0; |
| 2819 | } |
| 2820 | |
Mark Fasheh | 77fe20dc | 2013-08-06 11:42:48 -0700 | [diff] [blame] | 2821 | static inline void lock_extent_range(struct inode *inode, u64 off, u64 len) |
| 2822 | { |
| 2823 | /* do any pending delalloc/csum calc on src, one way or |
| 2824 | another, and lock file content */ |
| 2825 | while (1) { |
| 2826 | struct btrfs_ordered_extent *ordered; |
| 2827 | lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); |
| 2828 | ordered = btrfs_lookup_first_ordered_extent(inode, |
| 2829 | off + len - 1); |
Filipe Manana | ff5df9b | 2014-05-30 17:56:24 +0100 | [diff] [blame] | 2830 | if ((!ordered || |
| 2831 | ordered->file_offset + ordered->len <= off || |
| 2832 | ordered->file_offset >= off + len) && |
Mark Fasheh | 77fe20dc | 2013-08-06 11:42:48 -0700 | [diff] [blame] | 2833 | !test_range_bit(&BTRFS_I(inode)->io_tree, off, |
Filipe Manana | ff5df9b | 2014-05-30 17:56:24 +0100 | [diff] [blame] | 2834 | off + len - 1, EXTENT_DELALLOC, 0, NULL)) { |
| 2835 | if (ordered) |
| 2836 | btrfs_put_ordered_extent(ordered); |
Mark Fasheh | 77fe20dc | 2013-08-06 11:42:48 -0700 | [diff] [blame] | 2837 | break; |
Filipe Manana | ff5df9b | 2014-05-30 17:56:24 +0100 | [diff] [blame] | 2838 | } |
Mark Fasheh | 77fe20dc | 2013-08-06 11:42:48 -0700 | [diff] [blame] | 2839 | unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); |
| 2840 | if (ordered) |
| 2841 | btrfs_put_ordered_extent(ordered); |
| 2842 | btrfs_wait_ordered_range(inode, off, len); |
| 2843 | } |
| 2844 | } |
| 2845 | |
Mark Fasheh | f441460 | 2015-06-30 14:42:05 -0700 | [diff] [blame] | 2846 | static void btrfs_double_inode_unlock(struct inode *inode1, struct inode *inode2) |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2847 | { |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2848 | mutex_unlock(&inode1->i_mutex); |
| 2849 | mutex_unlock(&inode2->i_mutex); |
| 2850 | } |
| 2851 | |
Mark Fasheh | f441460 | 2015-06-30 14:42:05 -0700 | [diff] [blame] | 2852 | static void btrfs_double_inode_lock(struct inode *inode1, struct inode *inode2) |
| 2853 | { |
| 2854 | if (inode1 < inode2) |
| 2855 | swap(inode1, inode2); |
| 2856 | |
| 2857 | mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT); |
Mark Fasheh | 293a848 | 2015-06-30 14:42:06 -0700 | [diff] [blame] | 2858 | mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD); |
Mark Fasheh | f441460 | 2015-06-30 14:42:05 -0700 | [diff] [blame] | 2859 | } |
| 2860 | |
| 2861 | static void btrfs_double_extent_unlock(struct inode *inode1, u64 loff1, |
| 2862 | struct inode *inode2, u64 loff2, u64 len) |
| 2863 | { |
| 2864 | unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1); |
| 2865 | unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1); |
| 2866 | } |
| 2867 | |
| 2868 | static void btrfs_double_extent_lock(struct inode *inode1, u64 loff1, |
| 2869 | struct inode *inode2, u64 loff2, u64 len) |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2870 | { |
| 2871 | if (inode1 < inode2) { |
| 2872 | swap(inode1, inode2); |
| 2873 | swap(loff1, loff2); |
| 2874 | } |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2875 | lock_extent_range(inode1, loff1, len); |
Mark Fasheh | 293a848 | 2015-06-30 14:42:06 -0700 | [diff] [blame] | 2876 | lock_extent_range(inode2, loff2, len); |
Mark Fasheh | f441460 | 2015-06-30 14:42:05 -0700 | [diff] [blame] | 2877 | } |
| 2878 | |
| 2879 | struct cmp_pages { |
| 2880 | int num_pages; |
| 2881 | struct page **src_pages; |
| 2882 | struct page **dst_pages; |
| 2883 | }; |
| 2884 | |
| 2885 | static void btrfs_cmp_data_free(struct cmp_pages *cmp) |
| 2886 | { |
| 2887 | int i; |
| 2888 | struct page *pg; |
| 2889 | |
| 2890 | for (i = 0; i < cmp->num_pages; i++) { |
| 2891 | pg = cmp->src_pages[i]; |
| 2892 | if (pg) |
| 2893 | page_cache_release(pg); |
| 2894 | pg = cmp->dst_pages[i]; |
| 2895 | if (pg) |
| 2896 | page_cache_release(pg); |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2897 | } |
Mark Fasheh | f441460 | 2015-06-30 14:42:05 -0700 | [diff] [blame] | 2898 | kfree(cmp->src_pages); |
| 2899 | kfree(cmp->dst_pages); |
| 2900 | } |
| 2901 | |
| 2902 | static int btrfs_cmp_data_prepare(struct inode *src, u64 loff, |
| 2903 | struct inode *dst, u64 dst_loff, |
| 2904 | u64 len, struct cmp_pages *cmp) |
| 2905 | { |
| 2906 | int ret; |
| 2907 | int num_pages = PAGE_CACHE_ALIGN(len) >> PAGE_CACHE_SHIFT; |
| 2908 | struct page **src_pgarr, **dst_pgarr; |
| 2909 | |
| 2910 | /* |
| 2911 | * We must gather up all the pages before we initiate our |
| 2912 | * extent locking. We use an array for the page pointers. Size |
| 2913 | * of the array is bounded by len, which is in turn bounded by |
| 2914 | * BTRFS_MAX_DEDUPE_LEN. |
| 2915 | */ |
| 2916 | src_pgarr = kzalloc(num_pages * sizeof(struct page *), GFP_NOFS); |
| 2917 | dst_pgarr = kzalloc(num_pages * sizeof(struct page *), GFP_NOFS); |
| 2918 | if (!src_pgarr || !dst_pgarr) { |
| 2919 | kfree(src_pgarr); |
| 2920 | kfree(dst_pgarr); |
| 2921 | return -ENOMEM; |
| 2922 | } |
| 2923 | cmp->num_pages = num_pages; |
| 2924 | cmp->src_pages = src_pgarr; |
| 2925 | cmp->dst_pages = dst_pgarr; |
| 2926 | |
| 2927 | ret = gather_extent_pages(src, cmp->src_pages, cmp->num_pages, loff); |
| 2928 | if (ret) |
| 2929 | goto out; |
| 2930 | |
| 2931 | ret = gather_extent_pages(dst, cmp->dst_pages, cmp->num_pages, dst_loff); |
| 2932 | |
| 2933 | out: |
| 2934 | if (ret) |
| 2935 | btrfs_cmp_data_free(cmp); |
| 2936 | return 0; |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2937 | } |
| 2938 | |
| 2939 | static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst, |
Mark Fasheh | f441460 | 2015-06-30 14:42:05 -0700 | [diff] [blame] | 2940 | u64 dst_loff, u64 len, struct cmp_pages *cmp) |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2941 | { |
| 2942 | int ret = 0; |
Mark Fasheh | f441460 | 2015-06-30 14:42:05 -0700 | [diff] [blame] | 2943 | int i; |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2944 | struct page *src_page, *dst_page; |
| 2945 | unsigned int cmp_len = PAGE_CACHE_SIZE; |
| 2946 | void *addr, *dst_addr; |
| 2947 | |
Mark Fasheh | f441460 | 2015-06-30 14:42:05 -0700 | [diff] [blame] | 2948 | i = 0; |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2949 | while (len) { |
| 2950 | if (len < PAGE_CACHE_SIZE) |
| 2951 | cmp_len = len; |
| 2952 | |
Mark Fasheh | f441460 | 2015-06-30 14:42:05 -0700 | [diff] [blame] | 2953 | BUG_ON(i >= cmp->num_pages); |
| 2954 | |
| 2955 | src_page = cmp->src_pages[i]; |
| 2956 | dst_page = cmp->dst_pages[i]; |
| 2957 | |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2958 | addr = kmap_atomic(src_page); |
| 2959 | dst_addr = kmap_atomic(dst_page); |
| 2960 | |
| 2961 | flush_dcache_page(src_page); |
| 2962 | flush_dcache_page(dst_page); |
| 2963 | |
| 2964 | if (memcmp(addr, dst_addr, cmp_len)) |
| 2965 | ret = BTRFS_SAME_DATA_DIFFERS; |
| 2966 | |
| 2967 | kunmap_atomic(addr); |
| 2968 | kunmap_atomic(dst_addr); |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2969 | |
| 2970 | if (ret) |
| 2971 | break; |
| 2972 | |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2973 | len -= cmp_len; |
Mark Fasheh | f441460 | 2015-06-30 14:42:05 -0700 | [diff] [blame] | 2974 | i++; |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2975 | } |
| 2976 | |
| 2977 | return ret; |
| 2978 | } |
| 2979 | |
Mark Fasheh | e1d227a | 2015-06-08 15:05:25 -0700 | [diff] [blame] | 2980 | static int extent_same_check_offsets(struct inode *inode, u64 off, u64 *plen, |
| 2981 | u64 olen) |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2982 | { |
Mark Fasheh | e1d227a | 2015-06-08 15:05:25 -0700 | [diff] [blame] | 2983 | u64 len = *plen; |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2984 | u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize; |
| 2985 | |
Mark Fasheh | e1d227a | 2015-06-08 15:05:25 -0700 | [diff] [blame] | 2986 | if (off + olen > inode->i_size || off + olen < off) |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2987 | return -EINVAL; |
Mark Fasheh | e1d227a | 2015-06-08 15:05:25 -0700 | [diff] [blame] | 2988 | |
| 2989 | /* if we extend to eof, continue to block boundary */ |
| 2990 | if (off + len == inode->i_size) |
| 2991 | *plen = len = ALIGN(inode->i_size, bs) - off; |
| 2992 | |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2993 | /* Check that we are block aligned - btrfs_clone() requires this */ |
| 2994 | if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs)) |
| 2995 | return -EINVAL; |
| 2996 | |
| 2997 | return 0; |
| 2998 | } |
| 2999 | |
Mark Fasheh | e1d227a | 2015-06-08 15:05:25 -0700 | [diff] [blame] | 3000 | static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen, |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 3001 | struct inode *dst, u64 dst_loff) |
| 3002 | { |
| 3003 | int ret; |
Mark Fasheh | e1d227a | 2015-06-08 15:05:25 -0700 | [diff] [blame] | 3004 | u64 len = olen; |
Mark Fasheh | f441460 | 2015-06-30 14:42:05 -0700 | [diff] [blame] | 3005 | struct cmp_pages cmp; |
Mark Fasheh | 0efa9f4 | 2015-06-30 14:42:07 -0700 | [diff] [blame] | 3006 | int same_inode = 0; |
| 3007 | u64 same_lock_start = 0; |
| 3008 | u64 same_lock_len = 0; |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 3009 | |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 3010 | if (src == dst) |
Mark Fasheh | 0efa9f4 | 2015-06-30 14:42:07 -0700 | [diff] [blame] | 3011 | same_inode = 1; |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 3012 | |
Filipe Manana | 113e828 | 2015-03-30 18:26:47 +0100 | [diff] [blame] | 3013 | if (len == 0) |
| 3014 | return 0; |
| 3015 | |
Mark Fasheh | 0efa9f4 | 2015-06-30 14:42:07 -0700 | [diff] [blame] | 3016 | if (same_inode) { |
| 3017 | mutex_lock(&src->i_mutex); |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 3018 | |
Mark Fasheh | 0efa9f4 | 2015-06-30 14:42:07 -0700 | [diff] [blame] | 3019 | ret = extent_same_check_offsets(src, loff, &len, olen); |
| 3020 | if (ret) |
| 3021 | goto out_unlock; |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 3022 | |
Mark Fasheh | 0efa9f4 | 2015-06-30 14:42:07 -0700 | [diff] [blame] | 3023 | /* |
| 3024 | * Single inode case wants the same checks, except we |
| 3025 | * don't want our length pushed out past i_size as |
| 3026 | * comparing that data range makes no sense. |
| 3027 | * |
| 3028 | * extent_same_check_offsets() will do this for an |
| 3029 | * unaligned length at i_size, so catch it here and |
| 3030 | * reject the request. |
| 3031 | * |
| 3032 | * This effectively means we require aligned extents |
| 3033 | * for the single-inode case, whereas the other cases |
| 3034 | * allow an unaligned length so long as it ends at |
| 3035 | * i_size. |
| 3036 | */ |
| 3037 | if (len != olen) { |
| 3038 | ret = -EINVAL; |
| 3039 | goto out_unlock; |
| 3040 | } |
| 3041 | |
| 3042 | /* Check for overlapping ranges */ |
| 3043 | if (dst_loff + len > loff && dst_loff < loff + len) { |
| 3044 | ret = -EINVAL; |
| 3045 | goto out_unlock; |
| 3046 | } |
| 3047 | |
| 3048 | same_lock_start = min_t(u64, loff, dst_loff); |
| 3049 | same_lock_len = max_t(u64, loff, dst_loff) + len - same_lock_start; |
| 3050 | } else { |
| 3051 | btrfs_double_inode_lock(src, dst); |
| 3052 | |
| 3053 | ret = extent_same_check_offsets(src, loff, &len, olen); |
| 3054 | if (ret) |
| 3055 | goto out_unlock; |
| 3056 | |
| 3057 | ret = extent_same_check_offsets(dst, dst_loff, &len, olen); |
| 3058 | if (ret) |
| 3059 | goto out_unlock; |
| 3060 | } |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 3061 | |
| 3062 | /* don't make the dst file partly checksummed */ |
| 3063 | if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != |
| 3064 | (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) { |
| 3065 | ret = -EINVAL; |
| 3066 | goto out_unlock; |
| 3067 | } |
| 3068 | |
Mark Fasheh | f441460 | 2015-06-30 14:42:05 -0700 | [diff] [blame] | 3069 | ret = btrfs_cmp_data_prepare(src, loff, dst, dst_loff, olen, &cmp); |
| 3070 | if (ret) |
| 3071 | goto out_unlock; |
| 3072 | |
Mark Fasheh | 0efa9f4 | 2015-06-30 14:42:07 -0700 | [diff] [blame] | 3073 | if (same_inode) |
| 3074 | lock_extent_range(src, same_lock_start, same_lock_len); |
| 3075 | else |
| 3076 | btrfs_double_extent_lock(src, loff, dst, dst_loff, len); |
Mark Fasheh | f441460 | 2015-06-30 14:42:05 -0700 | [diff] [blame] | 3077 | |
Mark Fasheh | 207910d | 2015-06-30 14:42:04 -0700 | [diff] [blame] | 3078 | /* pass original length for comparison so we stay within i_size */ |
Mark Fasheh | f441460 | 2015-06-30 14:42:05 -0700 | [diff] [blame] | 3079 | ret = btrfs_cmp_data(src, loff, dst, dst_loff, olen, &cmp); |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 3080 | if (ret == 0) |
Mark Fasheh | 1c919a5 | 2015-06-30 14:42:08 -0700 | [diff] [blame] | 3081 | ret = btrfs_clone(src, dst, loff, olen, len, dst_loff, 1); |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 3082 | |
Mark Fasheh | 0efa9f4 | 2015-06-30 14:42:07 -0700 | [diff] [blame] | 3083 | if (same_inode) |
| 3084 | unlock_extent(&BTRFS_I(src)->io_tree, same_lock_start, |
| 3085 | same_lock_start + same_lock_len - 1); |
| 3086 | else |
| 3087 | btrfs_double_extent_unlock(src, loff, dst, dst_loff, len); |
Mark Fasheh | f441460 | 2015-06-30 14:42:05 -0700 | [diff] [blame] | 3088 | |
| 3089 | btrfs_cmp_data_free(&cmp); |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 3090 | out_unlock: |
Mark Fasheh | 0efa9f4 | 2015-06-30 14:42:07 -0700 | [diff] [blame] | 3091 | if (same_inode) |
| 3092 | mutex_unlock(&src->i_mutex); |
| 3093 | else |
| 3094 | btrfs_double_inode_unlock(src, dst); |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 3095 | |
| 3096 | return ret; |
| 3097 | } |
| 3098 | |
| 3099 | #define BTRFS_MAX_DEDUPE_LEN (16 * 1024 * 1024) |
| 3100 | |
| 3101 | static long btrfs_ioctl_file_extent_same(struct file *file, |
Al Viro | 1c1c874 | 2013-12-11 23:07:51 -0500 | [diff] [blame] | 3102 | struct btrfs_ioctl_same_args __user *argp) |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 3103 | { |
Filipe Manana | 497b405 | 2015-07-03 08:36:11 +0100 | [diff] [blame] | 3104 | struct btrfs_ioctl_same_args *same = NULL; |
Mark Fasheh | cbf8b8c | 2013-09-17 15:43:54 -0700 | [diff] [blame] | 3105 | struct btrfs_ioctl_same_extent_info *info; |
Al Viro | 1c1c874 | 2013-12-11 23:07:51 -0500 | [diff] [blame] | 3106 | struct inode *src = file_inode(file); |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 3107 | u64 off; |
| 3108 | u64 len; |
| 3109 | int i; |
| 3110 | int ret; |
Mark Fasheh | cbf8b8c | 2013-09-17 15:43:54 -0700 | [diff] [blame] | 3111 | unsigned long size; |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 3112 | u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize; |
| 3113 | bool is_admin = capable(CAP_SYS_ADMIN); |
Al Viro | 1c1c874 | 2013-12-11 23:07:51 -0500 | [diff] [blame] | 3114 | u16 count; |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 3115 | |
| 3116 | if (!(file->f_mode & FMODE_READ)) |
| 3117 | return -EINVAL; |
| 3118 | |
| 3119 | ret = mnt_want_write_file(file); |
| 3120 | if (ret) |
| 3121 | return ret; |
| 3122 | |
Al Viro | 1c1c874 | 2013-12-11 23:07:51 -0500 | [diff] [blame] | 3123 | if (get_user(count, &argp->dest_count)) { |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 3124 | ret = -EFAULT; |
| 3125 | goto out; |
| 3126 | } |
| 3127 | |
Al Viro | 1c1c874 | 2013-12-11 23:07:51 -0500 | [diff] [blame] | 3128 | size = offsetof(struct btrfs_ioctl_same_args __user, info[count]); |
Mark Fasheh | cbf8b8c | 2013-09-17 15:43:54 -0700 | [diff] [blame] | 3129 | |
Al Viro | 1c1c874 | 2013-12-11 23:07:51 -0500 | [diff] [blame] | 3130 | same = memdup_user(argp, size); |
Mark Fasheh | cbf8b8c | 2013-09-17 15:43:54 -0700 | [diff] [blame] | 3131 | |
Geyslan G. Bem | 229eed4 | 2013-10-14 12:18:25 -0300 | [diff] [blame] | 3132 | if (IS_ERR(same)) { |
| 3133 | ret = PTR_ERR(same); |
Filipe Manana | 497b405 | 2015-07-03 08:36:11 +0100 | [diff] [blame] | 3134 | same = NULL; |
Mark Fasheh | cbf8b8c | 2013-09-17 15:43:54 -0700 | [diff] [blame] | 3135 | goto out; |
| 3136 | } |
| 3137 | |
| 3138 | off = same->logical_offset; |
| 3139 | len = same->length; |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 3140 | |
| 3141 | /* |
| 3142 | * Limit the total length we will dedupe for each operation. |
| 3143 | * This is intended to bound the total time spent in this |
| 3144 | * ioctl to something sane. |
| 3145 | */ |
| 3146 | if (len > BTRFS_MAX_DEDUPE_LEN) |
| 3147 | len = BTRFS_MAX_DEDUPE_LEN; |
| 3148 | |
| 3149 | if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) { |
| 3150 | /* |
| 3151 | * Btrfs does not support blocksize < page_size. As a |
| 3152 | * result, btrfs_cmp_data() won't correctly handle |
| 3153 | * this situation without an update. |
| 3154 | */ |
| 3155 | ret = -EINVAL; |
| 3156 | goto out; |
| 3157 | } |
| 3158 | |
| 3159 | ret = -EISDIR; |
| 3160 | if (S_ISDIR(src->i_mode)) |
| 3161 | goto out; |
| 3162 | |
| 3163 | ret = -EACCES; |
| 3164 | if (!S_ISREG(src->i_mode)) |
| 3165 | goto out; |
| 3166 | |
Mark Fasheh | cbf8b8c | 2013-09-17 15:43:54 -0700 | [diff] [blame] | 3167 | /* pre-format output fields to sane values */ |
Al Viro | 1c1c874 | 2013-12-11 23:07:51 -0500 | [diff] [blame] | 3168 | for (i = 0; i < count; i++) { |
Mark Fasheh | cbf8b8c | 2013-09-17 15:43:54 -0700 | [diff] [blame] | 3169 | same->info[i].bytes_deduped = 0ULL; |
| 3170 | same->info[i].status = 0; |
| 3171 | } |
| 3172 | |
Al Viro | 1c1c874 | 2013-12-11 23:07:51 -0500 | [diff] [blame] | 3173 | for (i = 0, info = same->info; i < count; i++, info++) { |
| 3174 | struct inode *dst; |
| 3175 | struct fd dst_file = fdget(info->fd); |
| 3176 | if (!dst_file.file) { |
Mark Fasheh | cbf8b8c | 2013-09-17 15:43:54 -0700 | [diff] [blame] | 3177 | info->status = -EBADF; |
Al Viro | 1c1c874 | 2013-12-11 23:07:51 -0500 | [diff] [blame] | 3178 | continue; |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 3179 | } |
Al Viro | 1c1c874 | 2013-12-11 23:07:51 -0500 | [diff] [blame] | 3180 | dst = file_inode(dst_file.file); |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 3181 | |
Al Viro | 1c1c874 | 2013-12-11 23:07:51 -0500 | [diff] [blame] | 3182 | if (!(is_admin || (dst_file.file->f_mode & FMODE_WRITE))) { |
Mark Fasheh | cbf8b8c | 2013-09-17 15:43:54 -0700 | [diff] [blame] | 3183 | info->status = -EINVAL; |
Al Viro | 1c1c874 | 2013-12-11 23:07:51 -0500 | [diff] [blame] | 3184 | } else if (file->f_path.mnt != dst_file.file->f_path.mnt) { |
| 3185 | info->status = -EXDEV; |
| 3186 | } else if (S_ISDIR(dst->i_mode)) { |
Mark Fasheh | cbf8b8c | 2013-09-17 15:43:54 -0700 | [diff] [blame] | 3187 | info->status = -EISDIR; |
Al Viro | 1c1c874 | 2013-12-11 23:07:51 -0500 | [diff] [blame] | 3188 | } else if (!S_ISREG(dst->i_mode)) { |
Mark Fasheh | cbf8b8c | 2013-09-17 15:43:54 -0700 | [diff] [blame] | 3189 | info->status = -EACCES; |
Al Viro | 1c1c874 | 2013-12-11 23:07:51 -0500 | [diff] [blame] | 3190 | } else { |
| 3191 | info->status = btrfs_extent_same(src, off, len, dst, |
| 3192 | info->logical_offset); |
| 3193 | if (info->status == 0) |
| 3194 | info->bytes_deduped += len; |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 3195 | } |
Al Viro | 1c1c874 | 2013-12-11 23:07:51 -0500 | [diff] [blame] | 3196 | fdput(dst_file); |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 3197 | } |
| 3198 | |
Mark Fasheh | cbf8b8c | 2013-09-17 15:43:54 -0700 | [diff] [blame] | 3199 | ret = copy_to_user(argp, same, size); |
| 3200 | if (ret) |
| 3201 | ret = -EFAULT; |
| 3202 | |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 3203 | out: |
| 3204 | mnt_drop_write_file(file); |
Filipe Manana | 497b405 | 2015-07-03 08:36:11 +0100 | [diff] [blame] | 3205 | kfree(same); |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 3206 | return ret; |
| 3207 | } |
| 3208 | |
Filipe Manana | f82a990 | 2014-06-01 01:50:28 +0100 | [diff] [blame] | 3209 | static int clone_finish_inode_update(struct btrfs_trans_handle *trans, |
| 3210 | struct inode *inode, |
| 3211 | u64 endoff, |
| 3212 | const u64 destoff, |
Mark Fasheh | 1c919a5 | 2015-06-30 14:42:08 -0700 | [diff] [blame] | 3213 | const u64 olen, |
| 3214 | int no_time_update) |
Filipe Manana | f82a990 | 2014-06-01 01:50:28 +0100 | [diff] [blame] | 3215 | { |
| 3216 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 3217 | int ret; |
| 3218 | |
| 3219 | inode_inc_iversion(inode); |
Mark Fasheh | 1c919a5 | 2015-06-30 14:42:08 -0700 | [diff] [blame] | 3220 | if (!no_time_update) |
| 3221 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
Filipe Manana | f82a990 | 2014-06-01 01:50:28 +0100 | [diff] [blame] | 3222 | /* |
| 3223 | * We round up to the block size at eof when determining which |
| 3224 | * extents to clone above, but shouldn't round up the file size. |
| 3225 | */ |
| 3226 | if (endoff > destoff + olen) |
| 3227 | endoff = destoff + olen; |
| 3228 | if (endoff > inode->i_size) |
| 3229 | btrfs_i_size_write(inode, endoff); |
| 3230 | |
| 3231 | ret = btrfs_update_inode(trans, root, inode); |
| 3232 | if (ret) { |
| 3233 | btrfs_abort_transaction(trans, root, ret); |
| 3234 | btrfs_end_transaction(trans, root); |
| 3235 | goto out; |
| 3236 | } |
| 3237 | ret = btrfs_end_transaction(trans, root); |
| 3238 | out: |
| 3239 | return ret; |
| 3240 | } |
| 3241 | |
Filipe Manana | 7ffbb59 | 2014-06-09 03:48:05 +0100 | [diff] [blame] | 3242 | static void clone_update_extent_map(struct inode *inode, |
| 3243 | const struct btrfs_trans_handle *trans, |
| 3244 | const struct btrfs_path *path, |
Filipe Manana | 7ffbb59 | 2014-06-09 03:48:05 +0100 | [diff] [blame] | 3245 | const u64 hole_offset, |
| 3246 | const u64 hole_len) |
| 3247 | { |
| 3248 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
| 3249 | struct extent_map *em; |
| 3250 | int ret; |
| 3251 | |
| 3252 | em = alloc_extent_map(); |
| 3253 | if (!em) { |
| 3254 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, |
| 3255 | &BTRFS_I(inode)->runtime_flags); |
| 3256 | return; |
| 3257 | } |
| 3258 | |
Filipe Manana | 14f5979 | 2014-06-29 21:45:40 +0100 | [diff] [blame] | 3259 | if (path) { |
| 3260 | struct btrfs_file_extent_item *fi; |
| 3261 | |
| 3262 | fi = btrfs_item_ptr(path->nodes[0], path->slots[0], |
| 3263 | struct btrfs_file_extent_item); |
Filipe Manana | 7ffbb59 | 2014-06-09 03:48:05 +0100 | [diff] [blame] | 3264 | btrfs_extent_item_to_extent_map(inode, path, fi, false, em); |
| 3265 | em->generation = -1; |
| 3266 | if (btrfs_file_extent_type(path->nodes[0], fi) == |
| 3267 | BTRFS_FILE_EXTENT_INLINE) |
| 3268 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, |
| 3269 | &BTRFS_I(inode)->runtime_flags); |
| 3270 | } else { |
| 3271 | em->start = hole_offset; |
| 3272 | em->len = hole_len; |
| 3273 | em->ram_bytes = em->len; |
| 3274 | em->orig_start = hole_offset; |
| 3275 | em->block_start = EXTENT_MAP_HOLE; |
| 3276 | em->block_len = 0; |
| 3277 | em->orig_block_len = 0; |
| 3278 | em->compress_type = BTRFS_COMPRESS_NONE; |
| 3279 | em->generation = trans->transid; |
| 3280 | } |
| 3281 | |
| 3282 | while (1) { |
| 3283 | write_lock(&em_tree->lock); |
| 3284 | ret = add_extent_mapping(em_tree, em, 1); |
| 3285 | write_unlock(&em_tree->lock); |
| 3286 | if (ret != -EEXIST) { |
| 3287 | free_extent_map(em); |
| 3288 | break; |
| 3289 | } |
| 3290 | btrfs_drop_extent_cache(inode, em->start, |
| 3291 | em->start + em->len - 1, 0); |
| 3292 | } |
| 3293 | |
David Sterba | ee39b43 | 2014-09-30 01:33:33 +0200 | [diff] [blame] | 3294 | if (ret) |
Filipe Manana | 7ffbb59 | 2014-06-09 03:48:05 +0100 | [diff] [blame] | 3295 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, |
| 3296 | &BTRFS_I(inode)->runtime_flags); |
| 3297 | } |
| 3298 | |
Filipe Manana | 8039d87 | 2015-10-13 15:15:00 +0100 | [diff] [blame] | 3299 | /* |
| 3300 | * Make sure we do not end up inserting an inline extent into a file that has |
| 3301 | * already other (non-inline) extents. If a file has an inline extent it can |
| 3302 | * not have any other extents and the (single) inline extent must start at the |
| 3303 | * file offset 0. Failing to respect these rules will lead to file corruption, |
| 3304 | * resulting in EIO errors on read/write operations, hitting BUG_ON's in mm, etc |
| 3305 | * |
| 3306 | * We can have extents that have been already written to disk or we can have |
| 3307 | * dirty ranges still in delalloc, in which case the extent maps and items are |
| 3308 | * created only when we run delalloc, and the delalloc ranges might fall outside |
| 3309 | * the range we are currently locking in the inode's io tree. So we check the |
| 3310 | * inode's i_size because of that (i_size updates are done while holding the |
| 3311 | * i_mutex, which we are holding here). |
| 3312 | * We also check to see if the inode has a size not greater than "datal" but has |
| 3313 | * extents beyond it, due to an fallocate with FALLOC_FL_KEEP_SIZE (and we are |
| 3314 | * protected against such concurrent fallocate calls by the i_mutex). |
| 3315 | * |
| 3316 | * If the file has no extents but a size greater than datal, do not allow the |
| 3317 | * copy because we would need turn the inline extent into a non-inline one (even |
| 3318 | * with NO_HOLES enabled). If we find our destination inode only has one inline |
| 3319 | * extent, just overwrite it with the source inline extent if its size is less |
| 3320 | * than the source extent's size, or we could copy the source inline extent's |
| 3321 | * data into the destination inode's inline extent if the later is greater then |
| 3322 | * the former. |
| 3323 | */ |
| 3324 | static int clone_copy_inline_extent(struct inode *src, |
| 3325 | struct inode *dst, |
| 3326 | struct btrfs_trans_handle *trans, |
| 3327 | struct btrfs_path *path, |
| 3328 | struct btrfs_key *new_key, |
| 3329 | const u64 drop_start, |
| 3330 | const u64 datal, |
| 3331 | const u64 skip, |
| 3332 | const u64 size, |
| 3333 | char *inline_data) |
| 3334 | { |
| 3335 | struct btrfs_root *root = BTRFS_I(dst)->root; |
| 3336 | const u64 aligned_end = ALIGN(new_key->offset + datal, |
| 3337 | root->sectorsize); |
| 3338 | int ret; |
| 3339 | struct btrfs_key key; |
| 3340 | |
| 3341 | if (new_key->offset > 0) |
| 3342 | return -EOPNOTSUPP; |
| 3343 | |
| 3344 | key.objectid = btrfs_ino(dst); |
| 3345 | key.type = BTRFS_EXTENT_DATA_KEY; |
| 3346 | key.offset = 0; |
| 3347 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 3348 | if (ret < 0) { |
| 3349 | return ret; |
| 3350 | } else if (ret > 0) { |
| 3351 | if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) { |
| 3352 | ret = btrfs_next_leaf(root, path); |
| 3353 | if (ret < 0) |
| 3354 | return ret; |
| 3355 | else if (ret > 0) |
| 3356 | goto copy_inline_extent; |
| 3357 | } |
| 3358 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); |
| 3359 | if (key.objectid == btrfs_ino(dst) && |
| 3360 | key.type == BTRFS_EXTENT_DATA_KEY) { |
| 3361 | ASSERT(key.offset > 0); |
| 3362 | return -EOPNOTSUPP; |
| 3363 | } |
| 3364 | } else if (i_size_read(dst) <= datal) { |
| 3365 | struct btrfs_file_extent_item *ei; |
| 3366 | u64 ext_len; |
| 3367 | |
| 3368 | /* |
| 3369 | * If the file size is <= datal, make sure there are no other |
| 3370 | * extents following (can happen do to an fallocate call with |
| 3371 | * the flag FALLOC_FL_KEEP_SIZE). |
| 3372 | */ |
| 3373 | ei = btrfs_item_ptr(path->nodes[0], path->slots[0], |
| 3374 | struct btrfs_file_extent_item); |
| 3375 | /* |
| 3376 | * If it's an inline extent, it can not have other extents |
| 3377 | * following it. |
| 3378 | */ |
| 3379 | if (btrfs_file_extent_type(path->nodes[0], ei) == |
| 3380 | BTRFS_FILE_EXTENT_INLINE) |
| 3381 | goto copy_inline_extent; |
| 3382 | |
| 3383 | ext_len = btrfs_file_extent_num_bytes(path->nodes[0], ei); |
| 3384 | if (ext_len > aligned_end) |
| 3385 | return -EOPNOTSUPP; |
| 3386 | |
| 3387 | ret = btrfs_next_item(root, path); |
| 3388 | if (ret < 0) { |
| 3389 | return ret; |
| 3390 | } else if (ret == 0) { |
| 3391 | btrfs_item_key_to_cpu(path->nodes[0], &key, |
| 3392 | path->slots[0]); |
| 3393 | if (key.objectid == btrfs_ino(dst) && |
| 3394 | key.type == BTRFS_EXTENT_DATA_KEY) |
| 3395 | return -EOPNOTSUPP; |
| 3396 | } |
| 3397 | } |
| 3398 | |
| 3399 | copy_inline_extent: |
| 3400 | /* |
| 3401 | * We have no extent items, or we have an extent at offset 0 which may |
| 3402 | * or may not be inlined. All these cases are dealt the same way. |
| 3403 | */ |
| 3404 | if (i_size_read(dst) > datal) { |
| 3405 | /* |
| 3406 | * If the destination inode has an inline extent... |
| 3407 | * This would require copying the data from the source inline |
| 3408 | * extent into the beginning of the destination's inline extent. |
| 3409 | * But this is really complex, both extents can be compressed |
| 3410 | * or just one of them, which would require decompressing and |
| 3411 | * re-compressing data (which could increase the new compressed |
| 3412 | * size, not allowing the compressed data to fit anymore in an |
| 3413 | * inline extent). |
| 3414 | * So just don't support this case for now (it should be rare, |
| 3415 | * we are not really saving space when cloning inline extents). |
| 3416 | */ |
| 3417 | return -EOPNOTSUPP; |
| 3418 | } |
| 3419 | |
| 3420 | btrfs_release_path(path); |
| 3421 | ret = btrfs_drop_extents(trans, root, dst, drop_start, aligned_end, 1); |
| 3422 | if (ret) |
| 3423 | return ret; |
| 3424 | ret = btrfs_insert_empty_item(trans, root, path, new_key, size); |
| 3425 | if (ret) |
| 3426 | return ret; |
| 3427 | |
| 3428 | if (skip) { |
| 3429 | const u32 start = btrfs_file_extent_calc_inline_size(0); |
| 3430 | |
| 3431 | memmove(inline_data + start, inline_data + start + skip, datal); |
| 3432 | } |
| 3433 | |
| 3434 | write_extent_buffer(path->nodes[0], inline_data, |
| 3435 | btrfs_item_ptr_offset(path->nodes[0], |
| 3436 | path->slots[0]), |
| 3437 | size); |
| 3438 | inode_add_bytes(dst, datal); |
| 3439 | |
| 3440 | return 0; |
| 3441 | } |
| 3442 | |
Mark Fasheh | 32b7c68 | 2013-08-06 11:42:49 -0700 | [diff] [blame] | 3443 | /** |
| 3444 | * btrfs_clone() - clone a range from inode file to another |
| 3445 | * |
| 3446 | * @src: Inode to clone from |
| 3447 | * @inode: Inode to clone to |
| 3448 | * @off: Offset within source to start clone from |
| 3449 | * @olen: Original length, passed by user, of range to clone |
Mark Fasheh | 1c919a5 | 2015-06-30 14:42:08 -0700 | [diff] [blame] | 3450 | * @olen_aligned: Block-aligned value of olen |
Mark Fasheh | 32b7c68 | 2013-08-06 11:42:49 -0700 | [diff] [blame] | 3451 | * @destoff: Offset within @inode to start clone |
Mark Fasheh | 1c919a5 | 2015-06-30 14:42:08 -0700 | [diff] [blame] | 3452 | * @no_time_update: Whether to update mtime/ctime on the target inode |
Mark Fasheh | 32b7c68 | 2013-08-06 11:42:49 -0700 | [diff] [blame] | 3453 | */ |
| 3454 | static int btrfs_clone(struct inode *src, struct inode *inode, |
Filipe Manana | f82a990 | 2014-06-01 01:50:28 +0100 | [diff] [blame] | 3455 | const u64 off, const u64 olen, const u64 olen_aligned, |
Mark Fasheh | 1c919a5 | 2015-06-30 14:42:08 -0700 | [diff] [blame] | 3456 | const u64 destoff, int no_time_update) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3457 | { |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3458 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Mark Fasheh | 32b7c68 | 2013-08-06 11:42:49 -0700 | [diff] [blame] | 3459 | struct btrfs_path *path = NULL; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3460 | struct extent_buffer *leaf; |
Mark Fasheh | 32b7c68 | 2013-08-06 11:42:49 -0700 | [diff] [blame] | 3461 | struct btrfs_trans_handle *trans; |
| 3462 | char *buf = NULL; |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 3463 | struct btrfs_key key; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3464 | u32 nritems; |
| 3465 | int slot; |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 3466 | int ret; |
Filipe Manana | f82a990 | 2014-06-01 01:50:28 +0100 | [diff] [blame] | 3467 | const u64 len = olen_aligned; |
Filipe Manana | f82a990 | 2014-06-01 01:50:28 +0100 | [diff] [blame] | 3468 | u64 last_dest_end = destoff; |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 3469 | |
| 3470 | ret = -ENOMEM; |
David Sterba | 707e8a0 | 2014-06-04 19:22:26 +0200 | [diff] [blame] | 3471 | buf = vmalloc(root->nodesize); |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 3472 | if (!buf) |
Mark Fasheh | 32b7c68 | 2013-08-06 11:42:49 -0700 | [diff] [blame] | 3473 | return ret; |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 3474 | |
| 3475 | path = btrfs_alloc_path(); |
| 3476 | if (!path) { |
| 3477 | vfree(buf); |
Mark Fasheh | 32b7c68 | 2013-08-06 11:42:49 -0700 | [diff] [blame] | 3478 | return ret; |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 3479 | } |
Mark Fasheh | 32b7c68 | 2013-08-06 11:42:49 -0700 | [diff] [blame] | 3480 | |
David Sterba | e4058b5 | 2015-11-27 16:31:35 +0100 | [diff] [blame^] | 3481 | path->reada = READA_FORWARD; |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3482 | /* clone data */ |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3483 | key.objectid = btrfs_ino(src); |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 3484 | key.type = BTRFS_EXTENT_DATA_KEY; |
Filipe Manana | 2c46382 | 2014-05-31 02:31:05 +0100 | [diff] [blame] | 3485 | key.offset = off; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3486 | |
| 3487 | while (1) { |
Chris Mason | de249e6 | 2015-04-11 05:09:06 -0700 | [diff] [blame] | 3488 | u64 next_key_min_offset = key.offset + 1; |
Filipe Manana | df858e7 | 2015-03-31 14:56:46 +0100 | [diff] [blame] | 3489 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3490 | /* |
| 3491 | * note the key will change type as we walk through the |
| 3492 | * tree. |
| 3493 | */ |
Filipe David Borba Manana | e4355f3 | 2014-01-13 19:35:01 +0000 | [diff] [blame] | 3494 | path->leave_spinning = 1; |
David Sterba | 362a20c | 2011-08-01 18:11:57 +0200 | [diff] [blame] | 3495 | ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, |
| 3496 | 0, 0); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3497 | if (ret < 0) |
| 3498 | goto out; |
Filipe Manana | 2c46382 | 2014-05-31 02:31:05 +0100 | [diff] [blame] | 3499 | /* |
| 3500 | * First search, if no extent item that starts at offset off was |
| 3501 | * found but the previous item is an extent item, it's possible |
| 3502 | * it might overlap our target range, therefore process it. |
| 3503 | */ |
| 3504 | if (key.offset == off && ret > 0 && path->slots[0] > 0) { |
| 3505 | btrfs_item_key_to_cpu(path->nodes[0], &key, |
| 3506 | path->slots[0] - 1); |
| 3507 | if (key.type == BTRFS_EXTENT_DATA_KEY) |
| 3508 | path->slots[0]--; |
| 3509 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3510 | |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 3511 | nritems = btrfs_header_nritems(path->nodes[0]); |
Filipe David Borba Manana | e4355f3 | 2014-01-13 19:35:01 +0000 | [diff] [blame] | 3512 | process_slot: |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 3513 | if (path->slots[0] >= nritems) { |
David Sterba | 362a20c | 2011-08-01 18:11:57 +0200 | [diff] [blame] | 3514 | ret = btrfs_next_leaf(BTRFS_I(src)->root, path); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3515 | if (ret < 0) |
| 3516 | goto out; |
| 3517 | if (ret > 0) |
| 3518 | break; |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 3519 | nritems = btrfs_header_nritems(path->nodes[0]); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3520 | } |
| 3521 | leaf = path->nodes[0]; |
| 3522 | slot = path->slots[0]; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3523 | |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 3524 | btrfs_item_key_to_cpu(leaf, &key, slot); |
David Sterba | 962a298 | 2014-06-04 18:41:45 +0200 | [diff] [blame] | 3525 | if (key.type > BTRFS_EXTENT_DATA_KEY || |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3526 | key.objectid != btrfs_ino(src)) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3527 | break; |
| 3528 | |
David Sterba | 962a298 | 2014-06-04 18:41:45 +0200 | [diff] [blame] | 3529 | if (key.type == BTRFS_EXTENT_DATA_KEY) { |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3530 | struct btrfs_file_extent_item *extent; |
| 3531 | int type; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3532 | u32 size; |
| 3533 | struct btrfs_key new_key; |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3534 | u64 disko = 0, diskl = 0; |
| 3535 | u64 datao = 0, datal = 0; |
| 3536 | u8 comp; |
Filipe Manana | f82a990 | 2014-06-01 01:50:28 +0100 | [diff] [blame] | 3537 | u64 drop_start; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3538 | |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3539 | extent = btrfs_item_ptr(leaf, slot, |
| 3540 | struct btrfs_file_extent_item); |
| 3541 | comp = btrfs_file_extent_compression(leaf, extent); |
| 3542 | type = btrfs_file_extent_type(leaf, extent); |
Chris Mason | c8a894d | 2009-06-27 21:07:03 -0400 | [diff] [blame] | 3543 | if (type == BTRFS_FILE_EXTENT_REG || |
| 3544 | type == BTRFS_FILE_EXTENT_PREALLOC) { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3545 | disko = btrfs_file_extent_disk_bytenr(leaf, |
| 3546 | extent); |
| 3547 | diskl = btrfs_file_extent_disk_num_bytes(leaf, |
| 3548 | extent); |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3549 | datao = btrfs_file_extent_offset(leaf, extent); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3550 | datal = btrfs_file_extent_num_bytes(leaf, |
| 3551 | extent); |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3552 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
| 3553 | /* take upper bound, may be compressed */ |
| 3554 | datal = btrfs_file_extent_ram_bytes(leaf, |
| 3555 | extent); |
| 3556 | } |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3557 | |
Filipe Manana | 2c46382 | 2014-05-31 02:31:05 +0100 | [diff] [blame] | 3558 | /* |
| 3559 | * The first search might have left us at an extent |
| 3560 | * item that ends before our target range's start, can |
| 3561 | * happen if we have holes and NO_HOLES feature enabled. |
| 3562 | */ |
| 3563 | if (key.offset + datal <= off) { |
Filipe David Borba Manana | e4355f3 | 2014-01-13 19:35:01 +0000 | [diff] [blame] | 3564 | path->slots[0]++; |
| 3565 | goto process_slot; |
Filipe Manana | 2c46382 | 2014-05-31 02:31:05 +0100 | [diff] [blame] | 3566 | } else if (key.offset >= off + len) { |
| 3567 | break; |
Filipe David Borba Manana | e4355f3 | 2014-01-13 19:35:01 +0000 | [diff] [blame] | 3568 | } |
Filipe Manana | df858e7 | 2015-03-31 14:56:46 +0100 | [diff] [blame] | 3569 | next_key_min_offset = key.offset + datal; |
Filipe David Borba Manana | e4355f3 | 2014-01-13 19:35:01 +0000 | [diff] [blame] | 3570 | size = btrfs_item_size_nr(leaf, slot); |
| 3571 | read_extent_buffer(leaf, buf, |
| 3572 | btrfs_item_ptr_offset(leaf, slot), |
| 3573 | size); |
| 3574 | |
| 3575 | btrfs_release_path(path); |
| 3576 | path->leave_spinning = 0; |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3577 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3578 | memcpy(&new_key, &key, sizeof(new_key)); |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3579 | new_key.objectid = btrfs_ino(inode); |
Li Zefan | 4d728ec | 2011-01-26 14:10:43 +0800 | [diff] [blame] | 3580 | if (off <= key.offset) |
| 3581 | new_key.offset = key.offset + destoff - off; |
| 3582 | else |
| 3583 | new_key.offset = destoff; |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3584 | |
Sage Weil | b6f3409 | 2011-09-20 14:48:51 -0400 | [diff] [blame] | 3585 | /* |
Filipe Manana | f82a990 | 2014-06-01 01:50:28 +0100 | [diff] [blame] | 3586 | * Deal with a hole that doesn't have an extent item |
| 3587 | * that represents it (NO_HOLES feature enabled). |
| 3588 | * This hole is either in the middle of the cloning |
| 3589 | * range or at the beginning (fully overlaps it or |
| 3590 | * partially overlaps it). |
| 3591 | */ |
| 3592 | if (new_key.offset != last_dest_end) |
| 3593 | drop_start = last_dest_end; |
| 3594 | else |
| 3595 | drop_start = new_key.offset; |
| 3596 | |
| 3597 | /* |
Sage Weil | b6f3409 | 2011-09-20 14:48:51 -0400 | [diff] [blame] | 3598 | * 1 - adjusting old extent (we may have to split it) |
| 3599 | * 1 - add new extent |
| 3600 | * 1 - inode update |
| 3601 | */ |
| 3602 | trans = btrfs_start_transaction(root, 3); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3603 | if (IS_ERR(trans)) { |
| 3604 | ret = PTR_ERR(trans); |
| 3605 | goto out; |
| 3606 | } |
| 3607 | |
Chris Mason | c8a894d | 2009-06-27 21:07:03 -0400 | [diff] [blame] | 3608 | if (type == BTRFS_FILE_EXTENT_REG || |
| 3609 | type == BTRFS_FILE_EXTENT_PREALLOC) { |
Li Zefan | d72c084 | 2011-09-11 10:52:25 -0400 | [diff] [blame] | 3610 | /* |
| 3611 | * a | --- range to clone ---| b |
| 3612 | * | ------------- extent ------------- | |
| 3613 | */ |
| 3614 | |
Antonio Ospite | 9391558 | 2014-06-04 14:03:48 +0200 | [diff] [blame] | 3615 | /* subtract range b */ |
Li Zefan | d72c084 | 2011-09-11 10:52:25 -0400 | [diff] [blame] | 3616 | if (key.offset + datal > off + len) |
| 3617 | datal = off + len - key.offset; |
| 3618 | |
Antonio Ospite | 9391558 | 2014-06-04 14:03:48 +0200 | [diff] [blame] | 3619 | /* subtract range a */ |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3620 | if (off > key.offset) { |
| 3621 | datao += off - key.offset; |
| 3622 | datal -= off - key.offset; |
| 3623 | } |
| 3624 | |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 3625 | ret = btrfs_drop_extents(trans, root, inode, |
Filipe Manana | f82a990 | 2014-06-01 01:50:28 +0100 | [diff] [blame] | 3626 | drop_start, |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3627 | new_key.offset + datal, |
Josef Bacik | 2671485 | 2012-08-29 12:24:27 -0400 | [diff] [blame] | 3628 | 1); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3629 | if (ret) { |
David Sterba | 3f9e3df | 2014-04-15 18:50:17 +0200 | [diff] [blame] | 3630 | if (ret != -EOPNOTSUPP) |
Liu Bo | 00fdf13 | 2014-03-10 18:56:07 +0800 | [diff] [blame] | 3631 | btrfs_abort_transaction(trans, |
| 3632 | root, ret); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3633 | btrfs_end_transaction(trans, root); |
| 3634 | goto out; |
| 3635 | } |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3636 | |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3637 | ret = btrfs_insert_empty_item(trans, root, path, |
| 3638 | &new_key, size); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3639 | if (ret) { |
| 3640 | btrfs_abort_transaction(trans, root, |
| 3641 | ret); |
| 3642 | btrfs_end_transaction(trans, root); |
| 3643 | goto out; |
| 3644 | } |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3645 | |
| 3646 | leaf = path->nodes[0]; |
| 3647 | slot = path->slots[0]; |
| 3648 | write_extent_buffer(leaf, buf, |
| 3649 | btrfs_item_ptr_offset(leaf, slot), |
| 3650 | size); |
| 3651 | |
| 3652 | extent = btrfs_item_ptr(leaf, slot, |
| 3653 | struct btrfs_file_extent_item); |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3654 | |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3655 | /* disko == 0 means it's a hole */ |
| 3656 | if (!disko) |
| 3657 | datao = 0; |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3658 | |
| 3659 | btrfs_set_file_extent_offset(leaf, extent, |
| 3660 | datao); |
| 3661 | btrfs_set_file_extent_num_bytes(leaf, extent, |
| 3662 | datal); |
Josef Bacik | fcebe45 | 2014-05-13 17:30:47 -0700 | [diff] [blame] | 3663 | |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3664 | if (disko) { |
| 3665 | inode_add_bytes(inode, datal); |
| 3666 | ret = btrfs_inc_extent_ref(trans, root, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3667 | disko, diskl, 0, |
| 3668 | root->root_key.objectid, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3669 | btrfs_ino(inode), |
Filipe Manana | b06c4bf | 2015-10-23 07:52:54 +0100 | [diff] [blame] | 3670 | new_key.offset - datao); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3671 | if (ret) { |
| 3672 | btrfs_abort_transaction(trans, |
| 3673 | root, |
| 3674 | ret); |
| 3675 | btrfs_end_transaction(trans, |
| 3676 | root); |
| 3677 | goto out; |
| 3678 | |
| 3679 | } |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3680 | } |
| 3681 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
| 3682 | u64 skip = 0; |
| 3683 | u64 trim = 0; |
Filipe Manana | ed95876 | 2015-07-14 16:09:39 +0100 | [diff] [blame] | 3684 | |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3685 | if (off > key.offset) { |
| 3686 | skip = off - key.offset; |
| 3687 | new_key.offset += skip; |
| 3688 | } |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3689 | |
Liu Bo | aa42ffd | 2012-09-18 03:52:23 -0600 | [diff] [blame] | 3690 | if (key.offset + datal > off + len) |
| 3691 | trim = key.offset + datal - (off + len); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3692 | |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3693 | if (comp && (skip || trim)) { |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3694 | ret = -EINVAL; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3695 | btrfs_end_transaction(trans, root); |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3696 | goto out; |
| 3697 | } |
| 3698 | size -= skip + trim; |
| 3699 | datal -= skip + trim; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3700 | |
Filipe Manana | 8039d87 | 2015-10-13 15:15:00 +0100 | [diff] [blame] | 3701 | ret = clone_copy_inline_extent(src, inode, |
| 3702 | trans, path, |
| 3703 | &new_key, |
| 3704 | drop_start, |
| 3705 | datal, |
| 3706 | skip, size, buf); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3707 | if (ret) { |
David Sterba | 3f9e3df | 2014-04-15 18:50:17 +0200 | [diff] [blame] | 3708 | if (ret != -EOPNOTSUPP) |
Chris Mason | 3a29bc0 | 2014-04-07 07:10:40 -0700 | [diff] [blame] | 3709 | btrfs_abort_transaction(trans, |
Filipe Manana | 8039d87 | 2015-10-13 15:15:00 +0100 | [diff] [blame] | 3710 | root, |
| 3711 | ret); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3712 | btrfs_end_transaction(trans, root); |
| 3713 | goto out; |
| 3714 | } |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3715 | leaf = path->nodes[0]; |
| 3716 | slot = path->slots[0]; |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3717 | } |
| 3718 | |
Filipe Manana | 7ffbb59 | 2014-06-09 03:48:05 +0100 | [diff] [blame] | 3719 | /* If we have an implicit hole (NO_HOLES feature). */ |
| 3720 | if (drop_start < new_key.offset) |
| 3721 | clone_update_extent_map(inode, trans, |
Filipe Manana | 14f5979 | 2014-06-29 21:45:40 +0100 | [diff] [blame] | 3722 | NULL, drop_start, |
Filipe Manana | 7ffbb59 | 2014-06-09 03:48:05 +0100 | [diff] [blame] | 3723 | new_key.offset - drop_start); |
| 3724 | |
Filipe Manana | 14f5979 | 2014-06-29 21:45:40 +0100 | [diff] [blame] | 3725 | clone_update_extent_map(inode, trans, path, 0, 0); |
Filipe Manana | 7ffbb59 | 2014-06-09 03:48:05 +0100 | [diff] [blame] | 3726 | |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3727 | btrfs_mark_buffer_dirty(leaf); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3728 | btrfs_release_path(path); |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3729 | |
Filipe Manana | 62e2390 | 2014-08-08 02:47:06 +0100 | [diff] [blame] | 3730 | last_dest_end = ALIGN(new_key.offset + datal, |
| 3731 | root->sectorsize); |
Filipe Manana | f82a990 | 2014-06-01 01:50:28 +0100 | [diff] [blame] | 3732 | ret = clone_finish_inode_update(trans, inode, |
| 3733 | last_dest_end, |
Mark Fasheh | 1c919a5 | 2015-06-30 14:42:08 -0700 | [diff] [blame] | 3734 | destoff, olen, |
| 3735 | no_time_update); |
Filipe Manana | f82a990 | 2014-06-01 01:50:28 +0100 | [diff] [blame] | 3736 | if (ret) |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3737 | goto out; |
Filipe Manana | 2c46382 | 2014-05-31 02:31:05 +0100 | [diff] [blame] | 3738 | if (new_key.offset + datal >= destoff + len) |
| 3739 | break; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3740 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3741 | btrfs_release_path(path); |
Filipe Manana | df858e7 | 2015-03-31 14:56:46 +0100 | [diff] [blame] | 3742 | key.offset = next_key_min_offset; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3743 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3744 | ret = 0; |
Mark Fasheh | 32b7c68 | 2013-08-06 11:42:49 -0700 | [diff] [blame] | 3745 | |
Filipe Manana | f82a990 | 2014-06-01 01:50:28 +0100 | [diff] [blame] | 3746 | if (last_dest_end < destoff + len) { |
| 3747 | /* |
| 3748 | * We have an implicit hole (NO_HOLES feature is enabled) that |
| 3749 | * fully or partially overlaps our cloning range at its end. |
| 3750 | */ |
| 3751 | btrfs_release_path(path); |
| 3752 | |
| 3753 | /* |
| 3754 | * 1 - remove extent(s) |
| 3755 | * 1 - inode update |
| 3756 | */ |
| 3757 | trans = btrfs_start_transaction(root, 2); |
| 3758 | if (IS_ERR(trans)) { |
| 3759 | ret = PTR_ERR(trans); |
| 3760 | goto out; |
| 3761 | } |
| 3762 | ret = btrfs_drop_extents(trans, root, inode, |
| 3763 | last_dest_end, destoff + len, 1); |
| 3764 | if (ret) { |
| 3765 | if (ret != -EOPNOTSUPP) |
| 3766 | btrfs_abort_transaction(trans, root, ret); |
| 3767 | btrfs_end_transaction(trans, root); |
| 3768 | goto out; |
| 3769 | } |
Filipe Manana | 14f5979 | 2014-06-29 21:45:40 +0100 | [diff] [blame] | 3770 | clone_update_extent_map(inode, trans, NULL, last_dest_end, |
| 3771 | destoff + len - last_dest_end); |
Filipe Manana | f82a990 | 2014-06-01 01:50:28 +0100 | [diff] [blame] | 3772 | ret = clone_finish_inode_update(trans, inode, destoff + len, |
Mark Fasheh | 1c919a5 | 2015-06-30 14:42:08 -0700 | [diff] [blame] | 3773 | destoff, olen, no_time_update); |
Filipe Manana | f82a990 | 2014-06-01 01:50:28 +0100 | [diff] [blame] | 3774 | } |
| 3775 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3776 | out: |
Mark Fasheh | 32b7c68 | 2013-08-06 11:42:49 -0700 | [diff] [blame] | 3777 | btrfs_free_path(path); |
| 3778 | vfree(buf); |
| 3779 | return ret; |
| 3780 | } |
| 3781 | |
| 3782 | static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, |
| 3783 | u64 off, u64 olen, u64 destoff) |
| 3784 | { |
Al Viro | 54563d4 | 2013-09-01 15:57:51 -0400 | [diff] [blame] | 3785 | struct inode *inode = file_inode(file); |
Mark Fasheh | 32b7c68 | 2013-08-06 11:42:49 -0700 | [diff] [blame] | 3786 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 3787 | struct fd src_file; |
| 3788 | struct inode *src; |
| 3789 | int ret; |
| 3790 | u64 len = olen; |
| 3791 | u64 bs = root->fs_info->sb->s_blocksize; |
| 3792 | int same_inode = 0; |
| 3793 | |
| 3794 | /* |
| 3795 | * TODO: |
| 3796 | * - split compressed inline extents. annoying: we need to |
| 3797 | * decompress into destination's address_space (the file offset |
| 3798 | * may change, so source mapping won't do), then recompress (or |
| 3799 | * otherwise reinsert) a subrange. |
Liu Bo | 00fdf13 | 2014-03-10 18:56:07 +0800 | [diff] [blame] | 3800 | * |
| 3801 | * - split destination inode's inline extents. The inline extents can |
| 3802 | * be either compressed or non-compressed. |
Mark Fasheh | 32b7c68 | 2013-08-06 11:42:49 -0700 | [diff] [blame] | 3803 | */ |
| 3804 | |
| 3805 | /* the destination must be opened for writing */ |
| 3806 | if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) |
| 3807 | return -EINVAL; |
| 3808 | |
| 3809 | if (btrfs_root_readonly(root)) |
| 3810 | return -EROFS; |
| 3811 | |
| 3812 | ret = mnt_want_write_file(file); |
| 3813 | if (ret) |
| 3814 | return ret; |
| 3815 | |
| 3816 | src_file = fdget(srcfd); |
| 3817 | if (!src_file.file) { |
| 3818 | ret = -EBADF; |
| 3819 | goto out_drop_write; |
| 3820 | } |
| 3821 | |
| 3822 | ret = -EXDEV; |
| 3823 | if (src_file.file->f_path.mnt != file->f_path.mnt) |
| 3824 | goto out_fput; |
| 3825 | |
| 3826 | src = file_inode(src_file.file); |
| 3827 | |
| 3828 | ret = -EINVAL; |
| 3829 | if (src == inode) |
| 3830 | same_inode = 1; |
| 3831 | |
| 3832 | /* the src must be open for reading */ |
| 3833 | if (!(src_file.file->f_mode & FMODE_READ)) |
| 3834 | goto out_fput; |
| 3835 | |
| 3836 | /* don't make the dst file partly checksummed */ |
| 3837 | if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != |
| 3838 | (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) |
| 3839 | goto out_fput; |
| 3840 | |
| 3841 | ret = -EISDIR; |
| 3842 | if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) |
| 3843 | goto out_fput; |
| 3844 | |
| 3845 | ret = -EXDEV; |
| 3846 | if (src->i_sb != inode->i_sb) |
| 3847 | goto out_fput; |
| 3848 | |
| 3849 | if (!same_inode) { |
Mark Fasheh | 293a848 | 2015-06-30 14:42:06 -0700 | [diff] [blame] | 3850 | btrfs_double_inode_lock(src, inode); |
Mark Fasheh | 32b7c68 | 2013-08-06 11:42:49 -0700 | [diff] [blame] | 3851 | } else { |
| 3852 | mutex_lock(&src->i_mutex); |
| 3853 | } |
| 3854 | |
| 3855 | /* determine range to clone */ |
| 3856 | ret = -EINVAL; |
| 3857 | if (off + len > src->i_size || off + len < off) |
| 3858 | goto out_unlock; |
| 3859 | if (len == 0) |
| 3860 | olen = len = src->i_size - off; |
| 3861 | /* if we extend to eof, continue to block boundary */ |
| 3862 | if (off + len == src->i_size) |
| 3863 | len = ALIGN(src->i_size, bs) - off; |
| 3864 | |
Filipe Manana | ccccf3d6 | 2015-03-30 18:23:59 +0100 | [diff] [blame] | 3865 | if (len == 0) { |
| 3866 | ret = 0; |
| 3867 | goto out_unlock; |
| 3868 | } |
| 3869 | |
Mark Fasheh | 32b7c68 | 2013-08-06 11:42:49 -0700 | [diff] [blame] | 3870 | /* verify the end result is block aligned */ |
| 3871 | if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || |
| 3872 | !IS_ALIGNED(destoff, bs)) |
| 3873 | goto out_unlock; |
| 3874 | |
| 3875 | /* verify if ranges are overlapped within the same file */ |
| 3876 | if (same_inode) { |
| 3877 | if (destoff + len > off && destoff < off + len) |
| 3878 | goto out_unlock; |
| 3879 | } |
| 3880 | |
| 3881 | if (destoff > inode->i_size) { |
| 3882 | ret = btrfs_cont_expand(inode, inode->i_size, destoff); |
| 3883 | if (ret) |
| 3884 | goto out_unlock; |
| 3885 | } |
| 3886 | |
Filipe Manana | c125b8b | 2014-05-23 05:03:34 +0100 | [diff] [blame] | 3887 | /* |
| 3888 | * Lock the target range too. Right after we replace the file extent |
| 3889 | * items in the fs tree (which now point to the cloned data), we might |
| 3890 | * have a worker replace them with extent items relative to a write |
| 3891 | * operation that was issued before this clone operation (i.e. confront |
| 3892 | * with inode.c:btrfs_finish_ordered_io). |
| 3893 | */ |
| 3894 | if (same_inode) { |
| 3895 | u64 lock_start = min_t(u64, off, destoff); |
| 3896 | u64 lock_len = max_t(u64, off, destoff) + len - lock_start; |
Mark Fasheh | 32b7c68 | 2013-08-06 11:42:49 -0700 | [diff] [blame] | 3897 | |
Filipe Manana | c125b8b | 2014-05-23 05:03:34 +0100 | [diff] [blame] | 3898 | lock_extent_range(src, lock_start, lock_len); |
| 3899 | } else { |
Mark Fasheh | 293a848 | 2015-06-30 14:42:06 -0700 | [diff] [blame] | 3900 | btrfs_double_extent_lock(src, off, inode, destoff, len); |
Filipe Manana | c125b8b | 2014-05-23 05:03:34 +0100 | [diff] [blame] | 3901 | } |
Mark Fasheh | 32b7c68 | 2013-08-06 11:42:49 -0700 | [diff] [blame] | 3902 | |
Mark Fasheh | 1c919a5 | 2015-06-30 14:42:08 -0700 | [diff] [blame] | 3903 | ret = btrfs_clone(src, inode, off, olen, len, destoff, 0); |
Mark Fasheh | 32b7c68 | 2013-08-06 11:42:49 -0700 | [diff] [blame] | 3904 | |
Filipe Manana | c125b8b | 2014-05-23 05:03:34 +0100 | [diff] [blame] | 3905 | if (same_inode) { |
| 3906 | u64 lock_start = min_t(u64, off, destoff); |
| 3907 | u64 lock_end = max_t(u64, off, destoff) + len - 1; |
| 3908 | |
| 3909 | unlock_extent(&BTRFS_I(src)->io_tree, lock_start, lock_end); |
| 3910 | } else { |
Mark Fasheh | 293a848 | 2015-06-30 14:42:06 -0700 | [diff] [blame] | 3911 | btrfs_double_extent_unlock(src, off, inode, destoff, len); |
Filipe Manana | c125b8b | 2014-05-23 05:03:34 +0100 | [diff] [blame] | 3912 | } |
| 3913 | /* |
| 3914 | * Truncate page cache pages so that future reads will see the cloned |
| 3915 | * data immediately and not the previous data. |
| 3916 | */ |
| 3917 | truncate_inode_pages_range(&inode->i_data, destoff, |
| 3918 | PAGE_CACHE_ALIGN(destoff + len) - 1); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3919 | out_unlock: |
Mark Fasheh | 293a848 | 2015-06-30 14:42:06 -0700 | [diff] [blame] | 3920 | if (!same_inode) |
| 3921 | btrfs_double_inode_unlock(src, inode); |
| 3922 | else |
Filipe David Borba Manana | c57c2b3 | 2014-01-11 21:31:25 +0000 | [diff] [blame] | 3923 | mutex_unlock(&src->i_mutex); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3924 | out_fput: |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 3925 | fdput(src_file); |
Yan Zheng | ab67b7c | 2008-12-19 10:58:39 -0500 | [diff] [blame] | 3926 | out_drop_write: |
Al Viro | 2a79f17 | 2011-12-09 08:06:57 -0500 | [diff] [blame] | 3927 | mnt_drop_write_file(file); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3928 | return ret; |
| 3929 | } |
| 3930 | |
Christoph Hellwig | 7a865e8 | 2008-12-02 09:52:24 -0500 | [diff] [blame] | 3931 | static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3932 | { |
| 3933 | struct btrfs_ioctl_clone_range_args args; |
| 3934 | |
Christoph Hellwig | 7a865e8 | 2008-12-02 09:52:24 -0500 | [diff] [blame] | 3935 | if (copy_from_user(&args, argp, sizeof(args))) |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3936 | return -EFAULT; |
| 3937 | return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, |
| 3938 | args.src_length, args.dest_offset); |
| 3939 | } |
| 3940 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3941 | /* |
| 3942 | * there are many ways the trans_start and trans_end ioctls can lead |
| 3943 | * to deadlocks. They should only be used by applications that |
| 3944 | * basically own the machine, and have a very in depth understanding |
| 3945 | * of all the possible deadlocks and enospc problems. |
| 3946 | */ |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 3947 | static long btrfs_ioctl_trans_start(struct file *file) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3948 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 3949 | struct inode *inode = file_inode(file); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3950 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 3951 | struct btrfs_trans_handle *trans; |
Sage Weil | 1ab86ae | 2009-09-29 18:38:44 -0400 | [diff] [blame] | 3952 | int ret; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3953 | |
Sage Weil | 1ab86ae | 2009-09-29 18:38:44 -0400 | [diff] [blame] | 3954 | ret = -EPERM; |
Christoph Hellwig | df5b552 | 2008-06-11 21:53:58 -0400 | [diff] [blame] | 3955 | if (!capable(CAP_SYS_ADMIN)) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3956 | goto out; |
Sage Weil | 1ab86ae | 2009-09-29 18:38:44 -0400 | [diff] [blame] | 3957 | |
| 3958 | ret = -EINPROGRESS; |
| 3959 | if (file->private_data) |
| 3960 | goto out; |
Sage Weil | 9ca9ee0 | 2008-08-04 10:41:27 -0400 | [diff] [blame] | 3961 | |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 3962 | ret = -EROFS; |
| 3963 | if (btrfs_root_readonly(root)) |
| 3964 | goto out; |
| 3965 | |
Al Viro | a561be7 | 2011-11-23 11:57:51 -0500 | [diff] [blame] | 3966 | ret = mnt_want_write_file(file); |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 3967 | if (ret) |
| 3968 | goto out; |
| 3969 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 3970 | atomic_inc(&root->fs_info->open_ioctl_trans); |
Sage Weil | 9ca9ee0 | 2008-08-04 10:41:27 -0400 | [diff] [blame] | 3971 | |
Sage Weil | 1ab86ae | 2009-09-29 18:38:44 -0400 | [diff] [blame] | 3972 | ret = -ENOMEM; |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 3973 | trans = btrfs_start_ioctl_transaction(root); |
Tsutomu Itoh | abd30bb | 2011-01-24 00:57:10 +0000 | [diff] [blame] | 3974 | if (IS_ERR(trans)) |
Sage Weil | 1ab86ae | 2009-09-29 18:38:44 -0400 | [diff] [blame] | 3975 | goto out_drop; |
| 3976 | |
| 3977 | file->private_data = trans; |
| 3978 | return 0; |
| 3979 | |
| 3980 | out_drop: |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 3981 | atomic_dec(&root->fs_info->open_ioctl_trans); |
Al Viro | 2a79f17 | 2011-12-09 08:06:57 -0500 | [diff] [blame] | 3982 | mnt_drop_write_file(file); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3983 | out: |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3984 | return ret; |
| 3985 | } |
| 3986 | |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 3987 | static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) |
| 3988 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 3989 | struct inode *inode = file_inode(file); |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 3990 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 3991 | struct btrfs_root *new_root; |
| 3992 | struct btrfs_dir_item *di; |
| 3993 | struct btrfs_trans_handle *trans; |
| 3994 | struct btrfs_path *path; |
| 3995 | struct btrfs_key location; |
| 3996 | struct btrfs_disk_key disk_key; |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 3997 | u64 objectid = 0; |
| 3998 | u64 dir_id; |
Miao Xie | 3c04ce0 | 2012-11-26 08:43:07 +0000 | [diff] [blame] | 3999 | int ret; |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 4000 | |
| 4001 | if (!capable(CAP_SYS_ADMIN)) |
| 4002 | return -EPERM; |
| 4003 | |
Miao Xie | 3c04ce0 | 2012-11-26 08:43:07 +0000 | [diff] [blame] | 4004 | ret = mnt_want_write_file(file); |
| 4005 | if (ret) |
| 4006 | return ret; |
| 4007 | |
| 4008 | if (copy_from_user(&objectid, argp, sizeof(objectid))) { |
| 4009 | ret = -EFAULT; |
| 4010 | goto out; |
| 4011 | } |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 4012 | |
| 4013 | if (!objectid) |
chandan | 1cecf57 | 2013-09-13 19:34:10 +0530 | [diff] [blame] | 4014 | objectid = BTRFS_FS_TREE_OBJECTID; |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 4015 | |
| 4016 | location.objectid = objectid; |
| 4017 | location.type = BTRFS_ROOT_ITEM_KEY; |
| 4018 | location.offset = (u64)-1; |
| 4019 | |
| 4020 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); |
Miao Xie | 3c04ce0 | 2012-11-26 08:43:07 +0000 | [diff] [blame] | 4021 | if (IS_ERR(new_root)) { |
| 4022 | ret = PTR_ERR(new_root); |
| 4023 | goto out; |
| 4024 | } |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 4025 | |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 4026 | path = btrfs_alloc_path(); |
Miao Xie | 3c04ce0 | 2012-11-26 08:43:07 +0000 | [diff] [blame] | 4027 | if (!path) { |
| 4028 | ret = -ENOMEM; |
| 4029 | goto out; |
| 4030 | } |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 4031 | path->leave_spinning = 1; |
| 4032 | |
| 4033 | trans = btrfs_start_transaction(root, 1); |
Tsutomu Itoh | 98d5dc1 | 2011-01-20 06:19:37 +0000 | [diff] [blame] | 4034 | if (IS_ERR(trans)) { |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 4035 | btrfs_free_path(path); |
Miao Xie | 3c04ce0 | 2012-11-26 08:43:07 +0000 | [diff] [blame] | 4036 | ret = PTR_ERR(trans); |
| 4037 | goto out; |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 4038 | } |
| 4039 | |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 4040 | dir_id = btrfs_super_root_dir(root->fs_info->super_copy); |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 4041 | di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, |
| 4042 | dir_id, "default", 7, 1); |
Dan Carpenter | cf1e99a | 2010-05-29 09:47:24 +0000 | [diff] [blame] | 4043 | if (IS_ERR_OR_NULL(di)) { |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 4044 | btrfs_free_path(path); |
| 4045 | btrfs_end_transaction(trans, root); |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 4046 | btrfs_err(new_root->fs_info, "Umm, you don't have the default dir" |
| 4047 | "item, this isn't going to work"); |
Miao Xie | 3c04ce0 | 2012-11-26 08:43:07 +0000 | [diff] [blame] | 4048 | ret = -ENOENT; |
| 4049 | goto out; |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 4050 | } |
| 4051 | |
| 4052 | btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); |
| 4053 | btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); |
| 4054 | btrfs_mark_buffer_dirty(path->nodes[0]); |
| 4055 | btrfs_free_path(path); |
| 4056 | |
Mitch Harder | 2b0ce2c | 2012-07-24 11:58:43 -0600 | [diff] [blame] | 4057 | btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL); |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 4058 | btrfs_end_transaction(trans, root); |
Miao Xie | 3c04ce0 | 2012-11-26 08:43:07 +0000 | [diff] [blame] | 4059 | out: |
| 4060 | mnt_drop_write_file(file); |
| 4061 | return ret; |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 4062 | } |
| 4063 | |
Stefan Behrens | 5af3e8c | 2012-08-01 18:56:49 +0200 | [diff] [blame] | 4064 | void btrfs_get_block_group_info(struct list_head *groups_list, |
| 4065 | struct btrfs_ioctl_space_info *space) |
Josef Bacik | bf5fc093 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 4066 | { |
| 4067 | struct btrfs_block_group_cache *block_group; |
| 4068 | |
| 4069 | space->total_bytes = 0; |
| 4070 | space->used_bytes = 0; |
| 4071 | space->flags = 0; |
| 4072 | list_for_each_entry(block_group, groups_list, list) { |
| 4073 | space->flags = block_group->flags; |
| 4074 | space->total_bytes += block_group->key.offset; |
| 4075 | space->used_bytes += |
| 4076 | btrfs_block_group_used(&block_group->item); |
| 4077 | } |
| 4078 | } |
| 4079 | |
Eric Sandeen | 48a3b63 | 2013-04-25 20:41:01 +0000 | [diff] [blame] | 4080 | static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) |
Josef Bacik | 1406e43 | 2010-01-13 18:19:06 +0000 | [diff] [blame] | 4081 | { |
| 4082 | struct btrfs_ioctl_space_args space_args; |
| 4083 | struct btrfs_ioctl_space_info space; |
| 4084 | struct btrfs_ioctl_space_info *dest; |
Chris Mason | 7fde62b | 2010-03-16 15:40:10 -0400 | [diff] [blame] | 4085 | struct btrfs_ioctl_space_info *dest_orig; |
Daniel J Blueman | 13f2696 | 2011-04-11 15:56:31 +0000 | [diff] [blame] | 4086 | struct btrfs_ioctl_space_info __user *user_dest; |
Josef Bacik | 1406e43 | 2010-01-13 18:19:06 +0000 | [diff] [blame] | 4087 | struct btrfs_space_info *info; |
Josef Bacik | bf5fc093 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 4088 | u64 types[] = {BTRFS_BLOCK_GROUP_DATA, |
| 4089 | BTRFS_BLOCK_GROUP_SYSTEM, |
| 4090 | BTRFS_BLOCK_GROUP_METADATA, |
| 4091 | BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; |
| 4092 | int num_types = 4; |
Chris Mason | 7fde62b | 2010-03-16 15:40:10 -0400 | [diff] [blame] | 4093 | int alloc_size; |
Josef Bacik | 1406e43 | 2010-01-13 18:19:06 +0000 | [diff] [blame] | 4094 | int ret = 0; |
Dan Rosenberg | 51788b1 | 2011-02-14 16:04:23 -0500 | [diff] [blame] | 4095 | u64 slot_count = 0; |
Josef Bacik | bf5fc093 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 4096 | int i, c; |
Josef Bacik | 1406e43 | 2010-01-13 18:19:06 +0000 | [diff] [blame] | 4097 | |
| 4098 | if (copy_from_user(&space_args, |
| 4099 | (struct btrfs_ioctl_space_args __user *)arg, |
| 4100 | sizeof(space_args))) |
| 4101 | return -EFAULT; |
| 4102 | |
Josef Bacik | bf5fc093 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 4103 | for (i = 0; i < num_types; i++) { |
| 4104 | struct btrfs_space_info *tmp; |
| 4105 | |
| 4106 | info = NULL; |
| 4107 | rcu_read_lock(); |
| 4108 | list_for_each_entry_rcu(tmp, &root->fs_info->space_info, |
| 4109 | list) { |
| 4110 | if (tmp->flags == types[i]) { |
| 4111 | info = tmp; |
| 4112 | break; |
| 4113 | } |
| 4114 | } |
| 4115 | rcu_read_unlock(); |
| 4116 | |
| 4117 | if (!info) |
| 4118 | continue; |
| 4119 | |
| 4120 | down_read(&info->groups_sem); |
| 4121 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { |
| 4122 | if (!list_empty(&info->block_groups[c])) |
| 4123 | slot_count++; |
| 4124 | } |
| 4125 | up_read(&info->groups_sem); |
| 4126 | } |
Josef Bacik | 1406e43 | 2010-01-13 18:19:06 +0000 | [diff] [blame] | 4127 | |
David Sterba | 36523e95 | 2014-02-07 14:34:12 +0100 | [diff] [blame] | 4128 | /* |
| 4129 | * Global block reserve, exported as a space_info |
| 4130 | */ |
| 4131 | slot_count++; |
| 4132 | |
Chris Mason | 7fde62b | 2010-03-16 15:40:10 -0400 | [diff] [blame] | 4133 | /* space_slots == 0 means they are asking for a count */ |
| 4134 | if (space_args.space_slots == 0) { |
| 4135 | space_args.total_spaces = slot_count; |
| 4136 | goto out; |
| 4137 | } |
Josef Bacik | bf5fc093 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 4138 | |
Dan Rosenberg | 51788b1 | 2011-02-14 16:04:23 -0500 | [diff] [blame] | 4139 | slot_count = min_t(u64, space_args.space_slots, slot_count); |
Josef Bacik | bf5fc093 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 4140 | |
Chris Mason | 7fde62b | 2010-03-16 15:40:10 -0400 | [diff] [blame] | 4141 | alloc_size = sizeof(*dest) * slot_count; |
Josef Bacik | bf5fc093 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 4142 | |
Chris Mason | 7fde62b | 2010-03-16 15:40:10 -0400 | [diff] [blame] | 4143 | /* we generally have at most 6 or so space infos, one for each raid |
| 4144 | * level. So, a whole page should be more than enough for everyone |
| 4145 | */ |
| 4146 | if (alloc_size > PAGE_CACHE_SIZE) |
| 4147 | return -ENOMEM; |
| 4148 | |
| 4149 | space_args.total_spaces = 0; |
| 4150 | dest = kmalloc(alloc_size, GFP_NOFS); |
| 4151 | if (!dest) |
| 4152 | return -ENOMEM; |
| 4153 | dest_orig = dest; |
| 4154 | |
| 4155 | /* now we have a buffer to copy into */ |
Josef Bacik | bf5fc093 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 4156 | for (i = 0; i < num_types; i++) { |
| 4157 | struct btrfs_space_info *tmp; |
Chris Mason | 7fde62b | 2010-03-16 15:40:10 -0400 | [diff] [blame] | 4158 | |
Dan Rosenberg | 51788b1 | 2011-02-14 16:04:23 -0500 | [diff] [blame] | 4159 | if (!slot_count) |
| 4160 | break; |
| 4161 | |
Josef Bacik | bf5fc093 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 4162 | info = NULL; |
| 4163 | rcu_read_lock(); |
| 4164 | list_for_each_entry_rcu(tmp, &root->fs_info->space_info, |
| 4165 | list) { |
| 4166 | if (tmp->flags == types[i]) { |
| 4167 | info = tmp; |
| 4168 | break; |
| 4169 | } |
| 4170 | } |
| 4171 | rcu_read_unlock(); |
Chris Mason | 7fde62b | 2010-03-16 15:40:10 -0400 | [diff] [blame] | 4172 | |
Josef Bacik | bf5fc093 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 4173 | if (!info) |
| 4174 | continue; |
| 4175 | down_read(&info->groups_sem); |
| 4176 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { |
| 4177 | if (!list_empty(&info->block_groups[c])) { |
Stefan Behrens | 5af3e8c | 2012-08-01 18:56:49 +0200 | [diff] [blame] | 4178 | btrfs_get_block_group_info( |
| 4179 | &info->block_groups[c], &space); |
Josef Bacik | bf5fc093 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 4180 | memcpy(dest, &space, sizeof(space)); |
| 4181 | dest++; |
| 4182 | space_args.total_spaces++; |
Dan Rosenberg | 51788b1 | 2011-02-14 16:04:23 -0500 | [diff] [blame] | 4183 | slot_count--; |
Josef Bacik | bf5fc093 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 4184 | } |
Dan Rosenberg | 51788b1 | 2011-02-14 16:04:23 -0500 | [diff] [blame] | 4185 | if (!slot_count) |
| 4186 | break; |
Josef Bacik | bf5fc093 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 4187 | } |
| 4188 | up_read(&info->groups_sem); |
Josef Bacik | 1406e43 | 2010-01-13 18:19:06 +0000 | [diff] [blame] | 4189 | } |
Josef Bacik | 1406e43 | 2010-01-13 18:19:06 +0000 | [diff] [blame] | 4190 | |
David Sterba | 36523e95 | 2014-02-07 14:34:12 +0100 | [diff] [blame] | 4191 | /* |
| 4192 | * Add global block reserve |
| 4193 | */ |
| 4194 | if (slot_count) { |
| 4195 | struct btrfs_block_rsv *block_rsv = &root->fs_info->global_block_rsv; |
| 4196 | |
| 4197 | spin_lock(&block_rsv->lock); |
| 4198 | space.total_bytes = block_rsv->size; |
| 4199 | space.used_bytes = block_rsv->size - block_rsv->reserved; |
| 4200 | spin_unlock(&block_rsv->lock); |
| 4201 | space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; |
| 4202 | memcpy(dest, &space, sizeof(space)); |
| 4203 | space_args.total_spaces++; |
| 4204 | } |
| 4205 | |
Daniel J Blueman | 2eec6c8 | 2012-04-26 00:37:14 +0800 | [diff] [blame] | 4206 | user_dest = (struct btrfs_ioctl_space_info __user *) |
Chris Mason | 7fde62b | 2010-03-16 15:40:10 -0400 | [diff] [blame] | 4207 | (arg + sizeof(struct btrfs_ioctl_space_args)); |
| 4208 | |
| 4209 | if (copy_to_user(user_dest, dest_orig, alloc_size)) |
| 4210 | ret = -EFAULT; |
| 4211 | |
| 4212 | kfree(dest_orig); |
| 4213 | out: |
| 4214 | if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) |
Josef Bacik | 1406e43 | 2010-01-13 18:19:06 +0000 | [diff] [blame] | 4215 | ret = -EFAULT; |
| 4216 | |
| 4217 | return ret; |
| 4218 | } |
| 4219 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 4220 | /* |
| 4221 | * there are many ways the trans_start and trans_end ioctls can lead |
| 4222 | * to deadlocks. They should only be used by applications that |
| 4223 | * basically own the machine, and have a very in depth understanding |
| 4224 | * of all the possible deadlocks and enospc problems. |
| 4225 | */ |
| 4226 | long btrfs_ioctl_trans_end(struct file *file) |
| 4227 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 4228 | struct inode *inode = file_inode(file); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 4229 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 4230 | struct btrfs_trans_handle *trans; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 4231 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 4232 | trans = file->private_data; |
Sage Weil | 1ab86ae | 2009-09-29 18:38:44 -0400 | [diff] [blame] | 4233 | if (!trans) |
| 4234 | return -EINVAL; |
Christoph Hellwig | b214107 | 2008-09-05 16:43:31 -0400 | [diff] [blame] | 4235 | file->private_data = NULL; |
Sage Weil | 9ca9ee0 | 2008-08-04 10:41:27 -0400 | [diff] [blame] | 4236 | |
Sage Weil | 1ab86ae | 2009-09-29 18:38:44 -0400 | [diff] [blame] | 4237 | btrfs_end_transaction(trans, root); |
| 4238 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 4239 | atomic_dec(&root->fs_info->open_ioctl_trans); |
Sage Weil | 9ca9ee0 | 2008-08-04 10:41:27 -0400 | [diff] [blame] | 4240 | |
Al Viro | 2a79f17 | 2011-12-09 08:06:57 -0500 | [diff] [blame] | 4241 | mnt_drop_write_file(file); |
Sage Weil | 1ab86ae | 2009-09-29 18:38:44 -0400 | [diff] [blame] | 4242 | return 0; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 4243 | } |
| 4244 | |
Miao Xie | 9a8c28b | 2012-11-26 08:40:43 +0000 | [diff] [blame] | 4245 | static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, |
| 4246 | void __user *argp) |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 4247 | { |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 4248 | struct btrfs_trans_handle *trans; |
| 4249 | u64 transid; |
Tsutomu Itoh | db5b493 | 2011-03-23 08:14:16 +0000 | [diff] [blame] | 4250 | int ret; |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 4251 | |
Miao Xie | d4edf39 | 2013-02-20 09:17:06 +0000 | [diff] [blame] | 4252 | trans = btrfs_attach_transaction_barrier(root); |
Miao Xie | ff7c1d3 | 2012-11-26 08:41:29 +0000 | [diff] [blame] | 4253 | if (IS_ERR(trans)) { |
| 4254 | if (PTR_ERR(trans) != -ENOENT) |
| 4255 | return PTR_ERR(trans); |
| 4256 | |
| 4257 | /* No running transaction, don't bother */ |
| 4258 | transid = root->fs_info->last_trans_committed; |
| 4259 | goto out; |
| 4260 | } |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 4261 | transid = trans->transid; |
Tsutomu Itoh | db5b493 | 2011-03-23 08:14:16 +0000 | [diff] [blame] | 4262 | ret = btrfs_commit_transaction_async(trans, root, 0); |
Tsutomu Itoh | 8b2b2d3 | 2011-04-04 01:52:13 +0000 | [diff] [blame] | 4263 | if (ret) { |
| 4264 | btrfs_end_transaction(trans, root); |
Tsutomu Itoh | db5b493 | 2011-03-23 08:14:16 +0000 | [diff] [blame] | 4265 | return ret; |
Tsutomu Itoh | 8b2b2d3 | 2011-04-04 01:52:13 +0000 | [diff] [blame] | 4266 | } |
Miao Xie | ff7c1d3 | 2012-11-26 08:41:29 +0000 | [diff] [blame] | 4267 | out: |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 4268 | if (argp) |
| 4269 | if (copy_to_user(argp, &transid, sizeof(transid))) |
| 4270 | return -EFAULT; |
| 4271 | return 0; |
| 4272 | } |
| 4273 | |
Miao Xie | 9a8c28b | 2012-11-26 08:40:43 +0000 | [diff] [blame] | 4274 | static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root, |
| 4275 | void __user *argp) |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 4276 | { |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 4277 | u64 transid; |
| 4278 | |
| 4279 | if (argp) { |
| 4280 | if (copy_from_user(&transid, argp, sizeof(transid))) |
| 4281 | return -EFAULT; |
| 4282 | } else { |
| 4283 | transid = 0; /* current trans */ |
| 4284 | } |
| 4285 | return btrfs_wait_for_commit(root, transid); |
| 4286 | } |
| 4287 | |
Miao Xie | b8e9548 | 2012-11-26 08:48:01 +0000 | [diff] [blame] | 4288 | static long btrfs_ioctl_scrub(struct file *file, void __user *arg) |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 4289 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 4290 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 4291 | struct btrfs_ioctl_scrub_args *sa; |
Miao Xie | b8e9548 | 2012-11-26 08:48:01 +0000 | [diff] [blame] | 4292 | int ret; |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 4293 | |
| 4294 | if (!capable(CAP_SYS_ADMIN)) |
| 4295 | return -EPERM; |
| 4296 | |
| 4297 | sa = memdup_user(arg, sizeof(*sa)); |
| 4298 | if (IS_ERR(sa)) |
| 4299 | return PTR_ERR(sa); |
| 4300 | |
Miao Xie | b8e9548 | 2012-11-26 08:48:01 +0000 | [diff] [blame] | 4301 | if (!(sa->flags & BTRFS_SCRUB_READONLY)) { |
| 4302 | ret = mnt_want_write_file(file); |
| 4303 | if (ret) |
| 4304 | goto out; |
| 4305 | } |
| 4306 | |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 4307 | ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end, |
Stefan Behrens | 63a212a | 2012-11-05 18:29:28 +0100 | [diff] [blame] | 4308 | &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, |
| 4309 | 0); |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 4310 | |
| 4311 | if (copy_to_user(arg, sa, sizeof(*sa))) |
| 4312 | ret = -EFAULT; |
| 4313 | |
Miao Xie | b8e9548 | 2012-11-26 08:48:01 +0000 | [diff] [blame] | 4314 | if (!(sa->flags & BTRFS_SCRUB_READONLY)) |
| 4315 | mnt_drop_write_file(file); |
| 4316 | out: |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 4317 | kfree(sa); |
| 4318 | return ret; |
| 4319 | } |
| 4320 | |
| 4321 | static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) |
| 4322 | { |
| 4323 | if (!capable(CAP_SYS_ADMIN)) |
| 4324 | return -EPERM; |
| 4325 | |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 4326 | return btrfs_scrub_cancel(root->fs_info); |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 4327 | } |
| 4328 | |
| 4329 | static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, |
| 4330 | void __user *arg) |
| 4331 | { |
| 4332 | struct btrfs_ioctl_scrub_args *sa; |
| 4333 | int ret; |
| 4334 | |
| 4335 | if (!capable(CAP_SYS_ADMIN)) |
| 4336 | return -EPERM; |
| 4337 | |
| 4338 | sa = memdup_user(arg, sizeof(*sa)); |
| 4339 | if (IS_ERR(sa)) |
| 4340 | return PTR_ERR(sa); |
| 4341 | |
| 4342 | ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); |
| 4343 | |
| 4344 | if (copy_to_user(arg, sa, sizeof(*sa))) |
| 4345 | ret = -EFAULT; |
| 4346 | |
| 4347 | kfree(sa); |
| 4348 | return ret; |
| 4349 | } |
| 4350 | |
Stefan Behrens | c11d2c2 | 2012-05-25 16:06:09 +0200 | [diff] [blame] | 4351 | static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root, |
David Sterba | b27f7c0 | 2012-06-22 06:30:39 -0600 | [diff] [blame] | 4352 | void __user *arg) |
Stefan Behrens | c11d2c2 | 2012-05-25 16:06:09 +0200 | [diff] [blame] | 4353 | { |
| 4354 | struct btrfs_ioctl_get_dev_stats *sa; |
| 4355 | int ret; |
| 4356 | |
Stefan Behrens | c11d2c2 | 2012-05-25 16:06:09 +0200 | [diff] [blame] | 4357 | sa = memdup_user(arg, sizeof(*sa)); |
| 4358 | if (IS_ERR(sa)) |
| 4359 | return PTR_ERR(sa); |
| 4360 | |
David Sterba | b27f7c0 | 2012-06-22 06:30:39 -0600 | [diff] [blame] | 4361 | if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { |
| 4362 | kfree(sa); |
| 4363 | return -EPERM; |
| 4364 | } |
| 4365 | |
| 4366 | ret = btrfs_get_dev_stats(root, sa); |
Stefan Behrens | c11d2c2 | 2012-05-25 16:06:09 +0200 | [diff] [blame] | 4367 | |
| 4368 | if (copy_to_user(arg, sa, sizeof(*sa))) |
| 4369 | ret = -EFAULT; |
| 4370 | |
| 4371 | kfree(sa); |
| 4372 | return ret; |
| 4373 | } |
| 4374 | |
Stefan Behrens | 3f6bcfb | 2012-11-06 15:08:53 +0100 | [diff] [blame] | 4375 | static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg) |
| 4376 | { |
| 4377 | struct btrfs_ioctl_dev_replace_args *p; |
| 4378 | int ret; |
| 4379 | |
| 4380 | if (!capable(CAP_SYS_ADMIN)) |
| 4381 | return -EPERM; |
| 4382 | |
| 4383 | p = memdup_user(arg, sizeof(*p)); |
| 4384 | if (IS_ERR(p)) |
| 4385 | return PTR_ERR(p); |
| 4386 | |
| 4387 | switch (p->cmd) { |
| 4388 | case BTRFS_IOCTL_DEV_REPLACE_CMD_START: |
Ilya Dryomov | adfa97c | 2013-10-10 20:39:28 +0300 | [diff] [blame] | 4389 | if (root->fs_info->sb->s_flags & MS_RDONLY) { |
| 4390 | ret = -EROFS; |
| 4391 | goto out; |
| 4392 | } |
Stefan Behrens | 3f6bcfb | 2012-11-06 15:08:53 +0100 | [diff] [blame] | 4393 | if (atomic_xchg( |
| 4394 | &root->fs_info->mutually_exclusive_operation_running, |
| 4395 | 1)) { |
Anand Jain | e57138b | 2013-08-21 11:44:48 +0800 | [diff] [blame] | 4396 | ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
Stefan Behrens | 3f6bcfb | 2012-11-06 15:08:53 +0100 | [diff] [blame] | 4397 | } else { |
| 4398 | ret = btrfs_dev_replace_start(root, p); |
| 4399 | atomic_set( |
| 4400 | &root->fs_info->mutually_exclusive_operation_running, |
| 4401 | 0); |
| 4402 | } |
| 4403 | break; |
| 4404 | case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: |
| 4405 | btrfs_dev_replace_status(root->fs_info, p); |
| 4406 | ret = 0; |
| 4407 | break; |
| 4408 | case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: |
| 4409 | ret = btrfs_dev_replace_cancel(root->fs_info, p); |
| 4410 | break; |
| 4411 | default: |
| 4412 | ret = -EINVAL; |
| 4413 | break; |
| 4414 | } |
| 4415 | |
| 4416 | if (copy_to_user(arg, p, sizeof(*p))) |
| 4417 | ret = -EFAULT; |
Ilya Dryomov | adfa97c | 2013-10-10 20:39:28 +0300 | [diff] [blame] | 4418 | out: |
Stefan Behrens | 3f6bcfb | 2012-11-06 15:08:53 +0100 | [diff] [blame] | 4419 | kfree(p); |
| 4420 | return ret; |
| 4421 | } |
| 4422 | |
Jan Schmidt | d7728c9 | 2011-07-07 16:48:38 +0200 | [diff] [blame] | 4423 | static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) |
| 4424 | { |
| 4425 | int ret = 0; |
| 4426 | int i; |
Chris Mason | 740c3d2 | 2011-11-02 15:48:34 -0400 | [diff] [blame] | 4427 | u64 rel_ptr; |
Jan Schmidt | d7728c9 | 2011-07-07 16:48:38 +0200 | [diff] [blame] | 4428 | int size; |
Chris Mason | 806468f | 2011-11-06 03:07:10 -0500 | [diff] [blame] | 4429 | struct btrfs_ioctl_ino_path_args *ipa = NULL; |
Jan Schmidt | d7728c9 | 2011-07-07 16:48:38 +0200 | [diff] [blame] | 4430 | struct inode_fs_paths *ipath = NULL; |
| 4431 | struct btrfs_path *path; |
| 4432 | |
Kusanagi Kouichi | 82b22ac | 2013-01-28 11:33:31 +0000 | [diff] [blame] | 4433 | if (!capable(CAP_DAC_READ_SEARCH)) |
Jan Schmidt | d7728c9 | 2011-07-07 16:48:38 +0200 | [diff] [blame] | 4434 | return -EPERM; |
| 4435 | |
| 4436 | path = btrfs_alloc_path(); |
| 4437 | if (!path) { |
| 4438 | ret = -ENOMEM; |
| 4439 | goto out; |
| 4440 | } |
| 4441 | |
| 4442 | ipa = memdup_user(arg, sizeof(*ipa)); |
| 4443 | if (IS_ERR(ipa)) { |
| 4444 | ret = PTR_ERR(ipa); |
| 4445 | ipa = NULL; |
| 4446 | goto out; |
| 4447 | } |
| 4448 | |
| 4449 | size = min_t(u32, ipa->size, 4096); |
| 4450 | ipath = init_ipath(size, root, path); |
| 4451 | if (IS_ERR(ipath)) { |
| 4452 | ret = PTR_ERR(ipath); |
| 4453 | ipath = NULL; |
| 4454 | goto out; |
| 4455 | } |
| 4456 | |
| 4457 | ret = paths_from_inode(ipa->inum, ipath); |
| 4458 | if (ret < 0) |
| 4459 | goto out; |
| 4460 | |
| 4461 | for (i = 0; i < ipath->fspath->elem_cnt; ++i) { |
Jeff Mahoney | 745c4d8 | 2011-11-20 07:31:57 -0500 | [diff] [blame] | 4462 | rel_ptr = ipath->fspath->val[i] - |
| 4463 | (u64)(unsigned long)ipath->fspath->val; |
Chris Mason | 740c3d2 | 2011-11-02 15:48:34 -0400 | [diff] [blame] | 4464 | ipath->fspath->val[i] = rel_ptr; |
Jan Schmidt | d7728c9 | 2011-07-07 16:48:38 +0200 | [diff] [blame] | 4465 | } |
| 4466 | |
Jeff Mahoney | 745c4d8 | 2011-11-20 07:31:57 -0500 | [diff] [blame] | 4467 | ret = copy_to_user((void *)(unsigned long)ipa->fspath, |
| 4468 | (void *)(unsigned long)ipath->fspath, size); |
Jan Schmidt | d7728c9 | 2011-07-07 16:48:38 +0200 | [diff] [blame] | 4469 | if (ret) { |
| 4470 | ret = -EFAULT; |
| 4471 | goto out; |
| 4472 | } |
| 4473 | |
| 4474 | out: |
| 4475 | btrfs_free_path(path); |
| 4476 | free_ipath(ipath); |
| 4477 | kfree(ipa); |
| 4478 | |
| 4479 | return ret; |
| 4480 | } |
| 4481 | |
| 4482 | static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) |
| 4483 | { |
| 4484 | struct btrfs_data_container *inodes = ctx; |
| 4485 | const size_t c = 3 * sizeof(u64); |
| 4486 | |
| 4487 | if (inodes->bytes_left >= c) { |
| 4488 | inodes->bytes_left -= c; |
| 4489 | inodes->val[inodes->elem_cnt] = inum; |
| 4490 | inodes->val[inodes->elem_cnt + 1] = offset; |
| 4491 | inodes->val[inodes->elem_cnt + 2] = root; |
| 4492 | inodes->elem_cnt += 3; |
| 4493 | } else { |
| 4494 | inodes->bytes_missing += c - inodes->bytes_left; |
| 4495 | inodes->bytes_left = 0; |
| 4496 | inodes->elem_missed += 3; |
| 4497 | } |
| 4498 | |
| 4499 | return 0; |
| 4500 | } |
| 4501 | |
| 4502 | static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root, |
| 4503 | void __user *arg) |
| 4504 | { |
| 4505 | int ret = 0; |
| 4506 | int size; |
Jan Schmidt | d7728c9 | 2011-07-07 16:48:38 +0200 | [diff] [blame] | 4507 | struct btrfs_ioctl_logical_ino_args *loi; |
| 4508 | struct btrfs_data_container *inodes = NULL; |
| 4509 | struct btrfs_path *path = NULL; |
Jan Schmidt | d7728c9 | 2011-07-07 16:48:38 +0200 | [diff] [blame] | 4510 | |
| 4511 | if (!capable(CAP_SYS_ADMIN)) |
| 4512 | return -EPERM; |
| 4513 | |
| 4514 | loi = memdup_user(arg, sizeof(*loi)); |
| 4515 | if (IS_ERR(loi)) { |
| 4516 | ret = PTR_ERR(loi); |
| 4517 | loi = NULL; |
| 4518 | goto out; |
| 4519 | } |
| 4520 | |
| 4521 | path = btrfs_alloc_path(); |
| 4522 | if (!path) { |
| 4523 | ret = -ENOMEM; |
| 4524 | goto out; |
| 4525 | } |
| 4526 | |
Liu Bo | 425d17a | 2012-09-07 20:01:30 -0600 | [diff] [blame] | 4527 | size = min_t(u32, loi->size, 64 * 1024); |
Jan Schmidt | d7728c9 | 2011-07-07 16:48:38 +0200 | [diff] [blame] | 4528 | inodes = init_data_container(size); |
| 4529 | if (IS_ERR(inodes)) { |
| 4530 | ret = PTR_ERR(inodes); |
| 4531 | inodes = NULL; |
| 4532 | goto out; |
| 4533 | } |
| 4534 | |
Liu Bo | df031f0 | 2012-09-07 20:01:29 -0600 | [diff] [blame] | 4535 | ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path, |
| 4536 | build_ino_list, inodes); |
| 4537 | if (ret == -EINVAL) |
Jan Schmidt | d7728c9 | 2011-07-07 16:48:38 +0200 | [diff] [blame] | 4538 | ret = -ENOENT; |
| 4539 | if (ret < 0) |
| 4540 | goto out; |
| 4541 | |
Jeff Mahoney | 745c4d8 | 2011-11-20 07:31:57 -0500 | [diff] [blame] | 4542 | ret = copy_to_user((void *)(unsigned long)loi->inodes, |
| 4543 | (void *)(unsigned long)inodes, size); |
Jan Schmidt | d7728c9 | 2011-07-07 16:48:38 +0200 | [diff] [blame] | 4544 | if (ret) |
| 4545 | ret = -EFAULT; |
| 4546 | |
| 4547 | out: |
| 4548 | btrfs_free_path(path); |
Liu Bo | 425d17a | 2012-09-07 20:01:30 -0600 | [diff] [blame] | 4549 | vfree(inodes); |
Jan Schmidt | d7728c9 | 2011-07-07 16:48:38 +0200 | [diff] [blame] | 4550 | kfree(loi); |
| 4551 | |
| 4552 | return ret; |
| 4553 | } |
| 4554 | |
Ilya Dryomov | 19a39dc | 2012-01-16 22:04:49 +0200 | [diff] [blame] | 4555 | void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4556 | struct btrfs_ioctl_balance_args *bargs) |
| 4557 | { |
| 4558 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; |
| 4559 | |
| 4560 | bargs->flags = bctl->flags; |
| 4561 | |
Ilya Dryomov | 837d5b6 | 2012-01-16 22:04:49 +0200 | [diff] [blame] | 4562 | if (atomic_read(&fs_info->balance_running)) |
| 4563 | bargs->state |= BTRFS_BALANCE_STATE_RUNNING; |
| 4564 | if (atomic_read(&fs_info->balance_pause_req)) |
| 4565 | bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; |
Ilya Dryomov | a7e99c6 | 2012-01-16 22:04:49 +0200 | [diff] [blame] | 4566 | if (atomic_read(&fs_info->balance_cancel_req)) |
| 4567 | bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; |
Ilya Dryomov | 837d5b6 | 2012-01-16 22:04:49 +0200 | [diff] [blame] | 4568 | |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4569 | memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); |
| 4570 | memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); |
| 4571 | memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); |
Ilya Dryomov | 19a39dc | 2012-01-16 22:04:49 +0200 | [diff] [blame] | 4572 | |
| 4573 | if (lock) { |
| 4574 | spin_lock(&fs_info->balance_lock); |
| 4575 | memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); |
| 4576 | spin_unlock(&fs_info->balance_lock); |
| 4577 | } else { |
| 4578 | memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); |
| 4579 | } |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4580 | } |
| 4581 | |
Liu Bo | 9ba1f6e | 2012-05-11 18:11:26 +0800 | [diff] [blame] | 4582 | static long btrfs_ioctl_balance(struct file *file, void __user *arg) |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4583 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 4584 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4585 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 4586 | struct btrfs_ioctl_balance_args *bargs; |
| 4587 | struct btrfs_balance_control *bctl; |
Ilya Dryomov | ed0fb78 | 2013-01-20 15:57:57 +0200 | [diff] [blame] | 4588 | bool need_unlock; /* for mut. excl. ops lock */ |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4589 | int ret; |
| 4590 | |
| 4591 | if (!capable(CAP_SYS_ADMIN)) |
| 4592 | return -EPERM; |
| 4593 | |
Liu Bo | e54bfa3 | 2012-06-29 03:58:48 -0600 | [diff] [blame] | 4594 | ret = mnt_want_write_file(file); |
Liu Bo | 9ba1f6e | 2012-05-11 18:11:26 +0800 | [diff] [blame] | 4595 | if (ret) |
| 4596 | return ret; |
| 4597 | |
Ilya Dryomov | ed0fb78 | 2013-01-20 15:57:57 +0200 | [diff] [blame] | 4598 | again: |
| 4599 | if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) { |
| 4600 | mutex_lock(&fs_info->volume_mutex); |
| 4601 | mutex_lock(&fs_info->balance_mutex); |
| 4602 | need_unlock = true; |
| 4603 | goto locked; |
| 4604 | } |
| 4605 | |
| 4606 | /* |
| 4607 | * mut. excl. ops lock is locked. Three possibilites: |
| 4608 | * (1) some other op is running |
| 4609 | * (2) balance is running |
| 4610 | * (3) balance is paused -- special case (think resume) |
| 4611 | */ |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4612 | mutex_lock(&fs_info->balance_mutex); |
Ilya Dryomov | ed0fb78 | 2013-01-20 15:57:57 +0200 | [diff] [blame] | 4613 | if (fs_info->balance_ctl) { |
| 4614 | /* this is either (2) or (3) */ |
| 4615 | if (!atomic_read(&fs_info->balance_running)) { |
| 4616 | mutex_unlock(&fs_info->balance_mutex); |
| 4617 | if (!mutex_trylock(&fs_info->volume_mutex)) |
| 4618 | goto again; |
| 4619 | mutex_lock(&fs_info->balance_mutex); |
| 4620 | |
| 4621 | if (fs_info->balance_ctl && |
| 4622 | !atomic_read(&fs_info->balance_running)) { |
| 4623 | /* this is (3) */ |
| 4624 | need_unlock = false; |
| 4625 | goto locked; |
| 4626 | } |
| 4627 | |
| 4628 | mutex_unlock(&fs_info->balance_mutex); |
| 4629 | mutex_unlock(&fs_info->volume_mutex); |
| 4630 | goto again; |
| 4631 | } else { |
| 4632 | /* this is (2) */ |
| 4633 | mutex_unlock(&fs_info->balance_mutex); |
| 4634 | ret = -EINPROGRESS; |
| 4635 | goto out; |
| 4636 | } |
| 4637 | } else { |
| 4638 | /* this is (1) */ |
| 4639 | mutex_unlock(&fs_info->balance_mutex); |
Anand Jain | e57138b | 2013-08-21 11:44:48 +0800 | [diff] [blame] | 4640 | ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
Ilya Dryomov | ed0fb78 | 2013-01-20 15:57:57 +0200 | [diff] [blame] | 4641 | goto out; |
| 4642 | } |
| 4643 | |
| 4644 | locked: |
| 4645 | BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running)); |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4646 | |
| 4647 | if (arg) { |
| 4648 | bargs = memdup_user(arg, sizeof(*bargs)); |
| 4649 | if (IS_ERR(bargs)) { |
| 4650 | ret = PTR_ERR(bargs); |
Ilya Dryomov | ed0fb78 | 2013-01-20 15:57:57 +0200 | [diff] [blame] | 4651 | goto out_unlock; |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4652 | } |
Ilya Dryomov | de32226 | 2012-01-16 22:04:49 +0200 | [diff] [blame] | 4653 | |
| 4654 | if (bargs->flags & BTRFS_BALANCE_RESUME) { |
| 4655 | if (!fs_info->balance_ctl) { |
| 4656 | ret = -ENOTCONN; |
| 4657 | goto out_bargs; |
| 4658 | } |
| 4659 | |
| 4660 | bctl = fs_info->balance_ctl; |
| 4661 | spin_lock(&fs_info->balance_lock); |
| 4662 | bctl->flags |= BTRFS_BALANCE_RESUME; |
| 4663 | spin_unlock(&fs_info->balance_lock); |
| 4664 | |
| 4665 | goto do_balance; |
| 4666 | } |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4667 | } else { |
| 4668 | bargs = NULL; |
| 4669 | } |
| 4670 | |
Ilya Dryomov | ed0fb78 | 2013-01-20 15:57:57 +0200 | [diff] [blame] | 4671 | if (fs_info->balance_ctl) { |
Ilya Dryomov | 837d5b6 | 2012-01-16 22:04:49 +0200 | [diff] [blame] | 4672 | ret = -EINPROGRESS; |
| 4673 | goto out_bargs; |
| 4674 | } |
| 4675 | |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4676 | bctl = kzalloc(sizeof(*bctl), GFP_NOFS); |
| 4677 | if (!bctl) { |
| 4678 | ret = -ENOMEM; |
| 4679 | goto out_bargs; |
| 4680 | } |
| 4681 | |
| 4682 | bctl->fs_info = fs_info; |
| 4683 | if (arg) { |
| 4684 | memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); |
| 4685 | memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); |
| 4686 | memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); |
| 4687 | |
| 4688 | bctl->flags = bargs->flags; |
Ilya Dryomov | f43ffb6 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4689 | } else { |
| 4690 | /* balance everything - no filters */ |
| 4691 | bctl->flags |= BTRFS_BALANCE_TYPE_MASK; |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4692 | } |
| 4693 | |
David Sterba | 8eb9345 | 2015-10-12 16:55:54 +0200 | [diff] [blame] | 4694 | if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { |
| 4695 | ret = -EINVAL; |
Christian Engelmayer | 0f89abf | 2015-10-21 00:50:06 +0200 | [diff] [blame] | 4696 | goto out_bctl; |
David Sterba | 8eb9345 | 2015-10-12 16:55:54 +0200 | [diff] [blame] | 4697 | } |
| 4698 | |
Ilya Dryomov | de32226 | 2012-01-16 22:04:49 +0200 | [diff] [blame] | 4699 | do_balance: |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4700 | /* |
Ilya Dryomov | ed0fb78 | 2013-01-20 15:57:57 +0200 | [diff] [blame] | 4701 | * Ownership of bctl and mutually_exclusive_operation_running |
| 4702 | * goes to to btrfs_balance. bctl is freed in __cancel_balance, |
| 4703 | * or, if restriper was paused all the way until unmount, in |
| 4704 | * free_fs_info. mutually_exclusive_operation_running is |
| 4705 | * cleared in __cancel_balance. |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4706 | */ |
Ilya Dryomov | ed0fb78 | 2013-01-20 15:57:57 +0200 | [diff] [blame] | 4707 | need_unlock = false; |
| 4708 | |
| 4709 | ret = btrfs_balance(bctl, bargs); |
Christian Engelmayer | 0f89abf | 2015-10-21 00:50:06 +0200 | [diff] [blame] | 4710 | bctl = NULL; |
Ilya Dryomov | ed0fb78 | 2013-01-20 15:57:57 +0200 | [diff] [blame] | 4711 | |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4712 | if (arg) { |
| 4713 | if (copy_to_user(arg, bargs, sizeof(*bargs))) |
| 4714 | ret = -EFAULT; |
| 4715 | } |
| 4716 | |
Christian Engelmayer | 0f89abf | 2015-10-21 00:50:06 +0200 | [diff] [blame] | 4717 | out_bctl: |
| 4718 | kfree(bctl); |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4719 | out_bargs: |
| 4720 | kfree(bargs); |
Ilya Dryomov | ed0fb78 | 2013-01-20 15:57:57 +0200 | [diff] [blame] | 4721 | out_unlock: |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4722 | mutex_unlock(&fs_info->balance_mutex); |
| 4723 | mutex_unlock(&fs_info->volume_mutex); |
Ilya Dryomov | ed0fb78 | 2013-01-20 15:57:57 +0200 | [diff] [blame] | 4724 | if (need_unlock) |
| 4725 | atomic_set(&fs_info->mutually_exclusive_operation_running, 0); |
| 4726 | out: |
Liu Bo | e54bfa3 | 2012-06-29 03:58:48 -0600 | [diff] [blame] | 4727 | mnt_drop_write_file(file); |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4728 | return ret; |
| 4729 | } |
| 4730 | |
Ilya Dryomov | 837d5b6 | 2012-01-16 22:04:49 +0200 | [diff] [blame] | 4731 | static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd) |
| 4732 | { |
| 4733 | if (!capable(CAP_SYS_ADMIN)) |
| 4734 | return -EPERM; |
| 4735 | |
| 4736 | switch (cmd) { |
| 4737 | case BTRFS_BALANCE_CTL_PAUSE: |
| 4738 | return btrfs_pause_balance(root->fs_info); |
Ilya Dryomov | a7e99c6 | 2012-01-16 22:04:49 +0200 | [diff] [blame] | 4739 | case BTRFS_BALANCE_CTL_CANCEL: |
| 4740 | return btrfs_cancel_balance(root->fs_info); |
Ilya Dryomov | 837d5b6 | 2012-01-16 22:04:49 +0200 | [diff] [blame] | 4741 | } |
| 4742 | |
| 4743 | return -EINVAL; |
| 4744 | } |
| 4745 | |
Ilya Dryomov | 19a39dc | 2012-01-16 22:04:49 +0200 | [diff] [blame] | 4746 | static long btrfs_ioctl_balance_progress(struct btrfs_root *root, |
| 4747 | void __user *arg) |
| 4748 | { |
| 4749 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 4750 | struct btrfs_ioctl_balance_args *bargs; |
| 4751 | int ret = 0; |
| 4752 | |
| 4753 | if (!capable(CAP_SYS_ADMIN)) |
| 4754 | return -EPERM; |
| 4755 | |
| 4756 | mutex_lock(&fs_info->balance_mutex); |
| 4757 | if (!fs_info->balance_ctl) { |
| 4758 | ret = -ENOTCONN; |
| 4759 | goto out; |
| 4760 | } |
| 4761 | |
| 4762 | bargs = kzalloc(sizeof(*bargs), GFP_NOFS); |
| 4763 | if (!bargs) { |
| 4764 | ret = -ENOMEM; |
| 4765 | goto out; |
| 4766 | } |
| 4767 | |
| 4768 | update_ioctl_balance_args(fs_info, 1, bargs); |
| 4769 | |
| 4770 | if (copy_to_user(arg, bargs, sizeof(*bargs))) |
| 4771 | ret = -EFAULT; |
| 4772 | |
| 4773 | kfree(bargs); |
| 4774 | out: |
| 4775 | mutex_unlock(&fs_info->balance_mutex); |
| 4776 | return ret; |
| 4777 | } |
| 4778 | |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4779 | static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4780 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 4781 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4782 | struct btrfs_ioctl_quota_ctl_args *sa; |
| 4783 | struct btrfs_trans_handle *trans = NULL; |
| 4784 | int ret; |
| 4785 | int err; |
| 4786 | |
| 4787 | if (!capable(CAP_SYS_ADMIN)) |
| 4788 | return -EPERM; |
| 4789 | |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4790 | ret = mnt_want_write_file(file); |
| 4791 | if (ret) |
| 4792 | return ret; |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4793 | |
| 4794 | sa = memdup_user(arg, sizeof(*sa)); |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4795 | if (IS_ERR(sa)) { |
| 4796 | ret = PTR_ERR(sa); |
| 4797 | goto drop_write; |
| 4798 | } |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4799 | |
Wang Shilong | 7708f02 | 2013-04-07 10:24:57 +0000 | [diff] [blame] | 4800 | down_write(&root->fs_info->subvol_sem); |
Jan Schmidt | 2f23203 | 2013-04-25 16:04:51 +0000 | [diff] [blame] | 4801 | trans = btrfs_start_transaction(root->fs_info->tree_root, 2); |
| 4802 | if (IS_ERR(trans)) { |
| 4803 | ret = PTR_ERR(trans); |
| 4804 | goto out; |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4805 | } |
| 4806 | |
| 4807 | switch (sa->cmd) { |
| 4808 | case BTRFS_QUOTA_CTL_ENABLE: |
| 4809 | ret = btrfs_quota_enable(trans, root->fs_info); |
| 4810 | break; |
| 4811 | case BTRFS_QUOTA_CTL_DISABLE: |
| 4812 | ret = btrfs_quota_disable(trans, root->fs_info); |
| 4813 | break; |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4814 | default: |
| 4815 | ret = -EINVAL; |
| 4816 | break; |
| 4817 | } |
| 4818 | |
Jan Schmidt | 2f23203 | 2013-04-25 16:04:51 +0000 | [diff] [blame] | 4819 | err = btrfs_commit_transaction(trans, root->fs_info->tree_root); |
| 4820 | if (err && !ret) |
| 4821 | ret = err; |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4822 | out: |
| 4823 | kfree(sa); |
Wang Shilong | 7708f02 | 2013-04-07 10:24:57 +0000 | [diff] [blame] | 4824 | up_write(&root->fs_info->subvol_sem); |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4825 | drop_write: |
| 4826 | mnt_drop_write_file(file); |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4827 | return ret; |
| 4828 | } |
| 4829 | |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4830 | static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4831 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 4832 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4833 | struct btrfs_ioctl_qgroup_assign_args *sa; |
| 4834 | struct btrfs_trans_handle *trans; |
| 4835 | int ret; |
| 4836 | int err; |
| 4837 | |
| 4838 | if (!capable(CAP_SYS_ADMIN)) |
| 4839 | return -EPERM; |
| 4840 | |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4841 | ret = mnt_want_write_file(file); |
| 4842 | if (ret) |
| 4843 | return ret; |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4844 | |
| 4845 | sa = memdup_user(arg, sizeof(*sa)); |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4846 | if (IS_ERR(sa)) { |
| 4847 | ret = PTR_ERR(sa); |
| 4848 | goto drop_write; |
| 4849 | } |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4850 | |
| 4851 | trans = btrfs_join_transaction(root); |
| 4852 | if (IS_ERR(trans)) { |
| 4853 | ret = PTR_ERR(trans); |
| 4854 | goto out; |
| 4855 | } |
| 4856 | |
| 4857 | /* FIXME: check if the IDs really exist */ |
| 4858 | if (sa->assign) { |
| 4859 | ret = btrfs_add_qgroup_relation(trans, root->fs_info, |
| 4860 | sa->src, sa->dst); |
| 4861 | } else { |
| 4862 | ret = btrfs_del_qgroup_relation(trans, root->fs_info, |
| 4863 | sa->src, sa->dst); |
| 4864 | } |
| 4865 | |
Qu Wenruo | e082f56 | 2015-02-27 16:24:28 +0800 | [diff] [blame] | 4866 | /* update qgroup status and info */ |
| 4867 | err = btrfs_run_qgroups(trans, root->fs_info); |
| 4868 | if (err < 0) |
Anand Jain | a4553fe | 2015-09-25 14:43:01 +0800 | [diff] [blame] | 4869 | btrfs_std_error(root->fs_info, ret, |
Qu Wenruo | e082f56 | 2015-02-27 16:24:28 +0800 | [diff] [blame] | 4870 | "failed to update qgroup status and info\n"); |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4871 | err = btrfs_end_transaction(trans, root); |
| 4872 | if (err && !ret) |
| 4873 | ret = err; |
| 4874 | |
| 4875 | out: |
| 4876 | kfree(sa); |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4877 | drop_write: |
| 4878 | mnt_drop_write_file(file); |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4879 | return ret; |
| 4880 | } |
| 4881 | |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4882 | static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4883 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 4884 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4885 | struct btrfs_ioctl_qgroup_create_args *sa; |
| 4886 | struct btrfs_trans_handle *trans; |
| 4887 | int ret; |
| 4888 | int err; |
| 4889 | |
| 4890 | if (!capable(CAP_SYS_ADMIN)) |
| 4891 | return -EPERM; |
| 4892 | |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4893 | ret = mnt_want_write_file(file); |
| 4894 | if (ret) |
| 4895 | return ret; |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4896 | |
| 4897 | sa = memdup_user(arg, sizeof(*sa)); |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4898 | if (IS_ERR(sa)) { |
| 4899 | ret = PTR_ERR(sa); |
| 4900 | goto drop_write; |
| 4901 | } |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4902 | |
Miao Xie | d86e56c | 2012-11-15 11:35:41 +0000 | [diff] [blame] | 4903 | if (!sa->qgroupid) { |
| 4904 | ret = -EINVAL; |
| 4905 | goto out; |
| 4906 | } |
| 4907 | |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4908 | trans = btrfs_join_transaction(root); |
| 4909 | if (IS_ERR(trans)) { |
| 4910 | ret = PTR_ERR(trans); |
| 4911 | goto out; |
| 4912 | } |
| 4913 | |
| 4914 | /* FIXME: check if the IDs really exist */ |
| 4915 | if (sa->create) { |
Dongsheng Yang | 4087cf2 | 2015-01-18 10:59:23 -0500 | [diff] [blame] | 4916 | ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid); |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4917 | } else { |
| 4918 | ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid); |
| 4919 | } |
| 4920 | |
| 4921 | err = btrfs_end_transaction(trans, root); |
| 4922 | if (err && !ret) |
| 4923 | ret = err; |
| 4924 | |
| 4925 | out: |
| 4926 | kfree(sa); |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4927 | drop_write: |
| 4928 | mnt_drop_write_file(file); |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4929 | return ret; |
| 4930 | } |
| 4931 | |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4932 | static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4933 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 4934 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4935 | struct btrfs_ioctl_qgroup_limit_args *sa; |
| 4936 | struct btrfs_trans_handle *trans; |
| 4937 | int ret; |
| 4938 | int err; |
| 4939 | u64 qgroupid; |
| 4940 | |
| 4941 | if (!capable(CAP_SYS_ADMIN)) |
| 4942 | return -EPERM; |
| 4943 | |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4944 | ret = mnt_want_write_file(file); |
| 4945 | if (ret) |
| 4946 | return ret; |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4947 | |
| 4948 | sa = memdup_user(arg, sizeof(*sa)); |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4949 | if (IS_ERR(sa)) { |
| 4950 | ret = PTR_ERR(sa); |
| 4951 | goto drop_write; |
| 4952 | } |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4953 | |
| 4954 | trans = btrfs_join_transaction(root); |
| 4955 | if (IS_ERR(trans)) { |
| 4956 | ret = PTR_ERR(trans); |
| 4957 | goto out; |
| 4958 | } |
| 4959 | |
| 4960 | qgroupid = sa->qgroupid; |
| 4961 | if (!qgroupid) { |
| 4962 | /* take the current subvol as qgroup */ |
| 4963 | qgroupid = root->root_key.objectid; |
| 4964 | } |
| 4965 | |
| 4966 | /* FIXME: check if the IDs really exist */ |
| 4967 | ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim); |
| 4968 | |
| 4969 | err = btrfs_end_transaction(trans, root); |
| 4970 | if (err && !ret) |
| 4971 | ret = err; |
| 4972 | |
| 4973 | out: |
| 4974 | kfree(sa); |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4975 | drop_write: |
| 4976 | mnt_drop_write_file(file); |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4977 | return ret; |
| 4978 | } |
| 4979 | |
Jan Schmidt | 2f23203 | 2013-04-25 16:04:51 +0000 | [diff] [blame] | 4980 | static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) |
| 4981 | { |
Al Viro | 6d0379e | 2013-06-16 19:32:35 +0400 | [diff] [blame] | 4982 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
Jan Schmidt | 2f23203 | 2013-04-25 16:04:51 +0000 | [diff] [blame] | 4983 | struct btrfs_ioctl_quota_rescan_args *qsa; |
| 4984 | int ret; |
| 4985 | |
| 4986 | if (!capable(CAP_SYS_ADMIN)) |
| 4987 | return -EPERM; |
| 4988 | |
| 4989 | ret = mnt_want_write_file(file); |
| 4990 | if (ret) |
| 4991 | return ret; |
| 4992 | |
| 4993 | qsa = memdup_user(arg, sizeof(*qsa)); |
| 4994 | if (IS_ERR(qsa)) { |
| 4995 | ret = PTR_ERR(qsa); |
| 4996 | goto drop_write; |
| 4997 | } |
| 4998 | |
| 4999 | if (qsa->flags) { |
| 5000 | ret = -EINVAL; |
| 5001 | goto out; |
| 5002 | } |
| 5003 | |
| 5004 | ret = btrfs_qgroup_rescan(root->fs_info); |
| 5005 | |
| 5006 | out: |
| 5007 | kfree(qsa); |
| 5008 | drop_write: |
| 5009 | mnt_drop_write_file(file); |
| 5010 | return ret; |
| 5011 | } |
| 5012 | |
| 5013 | static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg) |
| 5014 | { |
Al Viro | 6d0379e | 2013-06-16 19:32:35 +0400 | [diff] [blame] | 5015 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
Jan Schmidt | 2f23203 | 2013-04-25 16:04:51 +0000 | [diff] [blame] | 5016 | struct btrfs_ioctl_quota_rescan_args *qsa; |
| 5017 | int ret = 0; |
| 5018 | |
| 5019 | if (!capable(CAP_SYS_ADMIN)) |
| 5020 | return -EPERM; |
| 5021 | |
| 5022 | qsa = kzalloc(sizeof(*qsa), GFP_NOFS); |
| 5023 | if (!qsa) |
| 5024 | return -ENOMEM; |
| 5025 | |
| 5026 | if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { |
| 5027 | qsa->flags = 1; |
| 5028 | qsa->progress = root->fs_info->qgroup_rescan_progress.objectid; |
| 5029 | } |
| 5030 | |
| 5031 | if (copy_to_user(arg, qsa, sizeof(*qsa))) |
| 5032 | ret = -EFAULT; |
| 5033 | |
| 5034 | kfree(qsa); |
| 5035 | return ret; |
| 5036 | } |
| 5037 | |
Jan Schmidt | 57254b6e | 2013-05-06 19:14:17 +0000 | [diff] [blame] | 5038 | static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg) |
| 5039 | { |
Al Viro | 54563d4 | 2013-09-01 15:57:51 -0400 | [diff] [blame] | 5040 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
Jan Schmidt | 57254b6e | 2013-05-06 19:14:17 +0000 | [diff] [blame] | 5041 | |
| 5042 | if (!capable(CAP_SYS_ADMIN)) |
| 5043 | return -EPERM; |
| 5044 | |
| 5045 | return btrfs_qgroup_wait_for_completion(root->fs_info); |
| 5046 | } |
| 5047 | |
Hugo Mills | abccd00 | 2014-01-30 20:17:00 +0000 | [diff] [blame] | 5048 | static long _btrfs_ioctl_set_received_subvol(struct file *file, |
| 5049 | struct btrfs_ioctl_received_subvol_args *sa) |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 5050 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 5051 | struct inode *inode = file_inode(file); |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 5052 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 5053 | struct btrfs_root_item *root_item = &root->root_item; |
| 5054 | struct btrfs_trans_handle *trans; |
| 5055 | struct timespec ct = CURRENT_TIME; |
| 5056 | int ret = 0; |
Stefan Behrens | dd5f961 | 2013-08-15 17:11:20 +0200 | [diff] [blame] | 5057 | int received_uuid_changed; |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 5058 | |
David Sterba | bd60ea0 | 2014-01-16 15:50:22 +0100 | [diff] [blame] | 5059 | if (!inode_owner_or_capable(inode)) |
| 5060 | return -EPERM; |
| 5061 | |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 5062 | ret = mnt_want_write_file(file); |
| 5063 | if (ret < 0) |
| 5064 | return ret; |
| 5065 | |
| 5066 | down_write(&root->fs_info->subvol_sem); |
| 5067 | |
| 5068 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { |
| 5069 | ret = -EINVAL; |
| 5070 | goto out; |
| 5071 | } |
| 5072 | |
| 5073 | if (btrfs_root_readonly(root)) { |
| 5074 | ret = -EROFS; |
| 5075 | goto out; |
| 5076 | } |
| 5077 | |
Stefan Behrens | dd5f961 | 2013-08-15 17:11:20 +0200 | [diff] [blame] | 5078 | /* |
| 5079 | * 1 - root item |
| 5080 | * 2 - uuid items (received uuid + subvol uuid) |
| 5081 | */ |
| 5082 | trans = btrfs_start_transaction(root, 3); |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 5083 | if (IS_ERR(trans)) { |
| 5084 | ret = PTR_ERR(trans); |
| 5085 | trans = NULL; |
| 5086 | goto out; |
| 5087 | } |
| 5088 | |
| 5089 | sa->rtransid = trans->transid; |
| 5090 | sa->rtime.sec = ct.tv_sec; |
| 5091 | sa->rtime.nsec = ct.tv_nsec; |
| 5092 | |
Stefan Behrens | dd5f961 | 2013-08-15 17:11:20 +0200 | [diff] [blame] | 5093 | received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, |
| 5094 | BTRFS_UUID_SIZE); |
| 5095 | if (received_uuid_changed && |
| 5096 | !btrfs_is_empty_uuid(root_item->received_uuid)) |
| 5097 | btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, |
| 5098 | root_item->received_uuid, |
| 5099 | BTRFS_UUID_KEY_RECEIVED_SUBVOL, |
| 5100 | root->root_key.objectid); |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 5101 | memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); |
| 5102 | btrfs_set_root_stransid(root_item, sa->stransid); |
| 5103 | btrfs_set_root_rtransid(root_item, sa->rtransid); |
Qu Wenruo | 3cae210 | 2013-07-16 11:19:18 +0800 | [diff] [blame] | 5104 | btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); |
| 5105 | btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); |
| 5106 | btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); |
| 5107 | btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 5108 | |
| 5109 | ret = btrfs_update_root(trans, root->fs_info->tree_root, |
| 5110 | &root->root_key, &root->root_item); |
| 5111 | if (ret < 0) { |
| 5112 | btrfs_end_transaction(trans, root); |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 5113 | goto out; |
Stefan Behrens | dd5f961 | 2013-08-15 17:11:20 +0200 | [diff] [blame] | 5114 | } |
| 5115 | if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { |
| 5116 | ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, |
| 5117 | sa->uuid, |
| 5118 | BTRFS_UUID_KEY_RECEIVED_SUBVOL, |
| 5119 | root->root_key.objectid); |
| 5120 | if (ret < 0 && ret != -EEXIST) { |
| 5121 | btrfs_abort_transaction(trans, root, ret); |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 5122 | goto out; |
Stefan Behrens | dd5f961 | 2013-08-15 17:11:20 +0200 | [diff] [blame] | 5123 | } |
| 5124 | } |
| 5125 | ret = btrfs_commit_transaction(trans, root); |
| 5126 | if (ret < 0) { |
| 5127 | btrfs_abort_transaction(trans, root, ret); |
| 5128 | goto out; |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 5129 | } |
| 5130 | |
Hugo Mills | abccd00 | 2014-01-30 20:17:00 +0000 | [diff] [blame] | 5131 | out: |
| 5132 | up_write(&root->fs_info->subvol_sem); |
| 5133 | mnt_drop_write_file(file); |
| 5134 | return ret; |
| 5135 | } |
| 5136 | |
| 5137 | #ifdef CONFIG_64BIT |
| 5138 | static long btrfs_ioctl_set_received_subvol_32(struct file *file, |
| 5139 | void __user *arg) |
| 5140 | { |
| 5141 | struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; |
| 5142 | struct btrfs_ioctl_received_subvol_args *args64 = NULL; |
| 5143 | int ret = 0; |
| 5144 | |
| 5145 | args32 = memdup_user(arg, sizeof(*args32)); |
| 5146 | if (IS_ERR(args32)) { |
| 5147 | ret = PTR_ERR(args32); |
| 5148 | args32 = NULL; |
| 5149 | goto out; |
| 5150 | } |
| 5151 | |
| 5152 | args64 = kmalloc(sizeof(*args64), GFP_NOFS); |
Dan Carpenter | 84dbeb8 | 2014-03-28 11:06:00 +0300 | [diff] [blame] | 5153 | if (!args64) { |
| 5154 | ret = -ENOMEM; |
Hugo Mills | abccd00 | 2014-01-30 20:17:00 +0000 | [diff] [blame] | 5155 | goto out; |
| 5156 | } |
| 5157 | |
| 5158 | memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); |
| 5159 | args64->stransid = args32->stransid; |
| 5160 | args64->rtransid = args32->rtransid; |
| 5161 | args64->stime.sec = args32->stime.sec; |
| 5162 | args64->stime.nsec = args32->stime.nsec; |
| 5163 | args64->rtime.sec = args32->rtime.sec; |
| 5164 | args64->rtime.nsec = args32->rtime.nsec; |
| 5165 | args64->flags = args32->flags; |
| 5166 | |
| 5167 | ret = _btrfs_ioctl_set_received_subvol(file, args64); |
| 5168 | if (ret) |
| 5169 | goto out; |
| 5170 | |
| 5171 | memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); |
| 5172 | args32->stransid = args64->stransid; |
| 5173 | args32->rtransid = args64->rtransid; |
| 5174 | args32->stime.sec = args64->stime.sec; |
| 5175 | args32->stime.nsec = args64->stime.nsec; |
| 5176 | args32->rtime.sec = args64->rtime.sec; |
| 5177 | args32->rtime.nsec = args64->rtime.nsec; |
| 5178 | args32->flags = args64->flags; |
| 5179 | |
| 5180 | ret = copy_to_user(arg, args32, sizeof(*args32)); |
| 5181 | if (ret) |
| 5182 | ret = -EFAULT; |
| 5183 | |
| 5184 | out: |
| 5185 | kfree(args32); |
| 5186 | kfree(args64); |
| 5187 | return ret; |
| 5188 | } |
| 5189 | #endif |
| 5190 | |
| 5191 | static long btrfs_ioctl_set_received_subvol(struct file *file, |
| 5192 | void __user *arg) |
| 5193 | { |
| 5194 | struct btrfs_ioctl_received_subvol_args *sa = NULL; |
| 5195 | int ret = 0; |
| 5196 | |
| 5197 | sa = memdup_user(arg, sizeof(*sa)); |
| 5198 | if (IS_ERR(sa)) { |
| 5199 | ret = PTR_ERR(sa); |
| 5200 | sa = NULL; |
| 5201 | goto out; |
| 5202 | } |
| 5203 | |
| 5204 | ret = _btrfs_ioctl_set_received_subvol(file, sa); |
| 5205 | |
| 5206 | if (ret) |
| 5207 | goto out; |
| 5208 | |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 5209 | ret = copy_to_user(arg, sa, sizeof(*sa)); |
| 5210 | if (ret) |
| 5211 | ret = -EFAULT; |
| 5212 | |
| 5213 | out: |
| 5214 | kfree(sa); |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 5215 | return ret; |
| 5216 | } |
| 5217 | |
jeff.liu | 867ab66 | 2013-01-05 02:48:01 +0000 | [diff] [blame] | 5218 | static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg) |
| 5219 | { |
Al Viro | 6d0379e | 2013-06-16 19:32:35 +0400 | [diff] [blame] | 5220 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
Anand Jain | a1b83ac | 2013-07-19 17:39:32 +0800 | [diff] [blame] | 5221 | size_t len; |
jeff.liu | 867ab66 | 2013-01-05 02:48:01 +0000 | [diff] [blame] | 5222 | int ret; |
Anand Jain | a1b83ac | 2013-07-19 17:39:32 +0800 | [diff] [blame] | 5223 | char label[BTRFS_LABEL_SIZE]; |
| 5224 | |
| 5225 | spin_lock(&root->fs_info->super_lock); |
| 5226 | memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE); |
| 5227 | spin_unlock(&root->fs_info->super_lock); |
| 5228 | |
| 5229 | len = strnlen(label, BTRFS_LABEL_SIZE); |
jeff.liu | 867ab66 | 2013-01-05 02:48:01 +0000 | [diff] [blame] | 5230 | |
| 5231 | if (len == BTRFS_LABEL_SIZE) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 5232 | btrfs_warn(root->fs_info, |
| 5233 | "label is too long, return the first %zu bytes", --len); |
jeff.liu | 867ab66 | 2013-01-05 02:48:01 +0000 | [diff] [blame] | 5234 | } |
| 5235 | |
jeff.liu | 867ab66 | 2013-01-05 02:48:01 +0000 | [diff] [blame] | 5236 | ret = copy_to_user(arg, label, len); |
jeff.liu | 867ab66 | 2013-01-05 02:48:01 +0000 | [diff] [blame] | 5237 | |
| 5238 | return ret ? -EFAULT : 0; |
| 5239 | } |
| 5240 | |
jeff.liu | a8bfd4a | 2013-01-05 02:48:08 +0000 | [diff] [blame] | 5241 | static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) |
| 5242 | { |
Al Viro | 6d0379e | 2013-06-16 19:32:35 +0400 | [diff] [blame] | 5243 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
jeff.liu | a8bfd4a | 2013-01-05 02:48:08 +0000 | [diff] [blame] | 5244 | struct btrfs_super_block *super_block = root->fs_info->super_copy; |
| 5245 | struct btrfs_trans_handle *trans; |
| 5246 | char label[BTRFS_LABEL_SIZE]; |
| 5247 | int ret; |
| 5248 | |
| 5249 | if (!capable(CAP_SYS_ADMIN)) |
| 5250 | return -EPERM; |
| 5251 | |
| 5252 | if (copy_from_user(label, arg, sizeof(label))) |
| 5253 | return -EFAULT; |
| 5254 | |
| 5255 | if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 5256 | btrfs_err(root->fs_info, "unable to set label with more than %d bytes", |
jeff.liu | a8bfd4a | 2013-01-05 02:48:08 +0000 | [diff] [blame] | 5257 | BTRFS_LABEL_SIZE - 1); |
| 5258 | return -EINVAL; |
| 5259 | } |
| 5260 | |
| 5261 | ret = mnt_want_write_file(file); |
| 5262 | if (ret) |
| 5263 | return ret; |
| 5264 | |
jeff.liu | a8bfd4a | 2013-01-05 02:48:08 +0000 | [diff] [blame] | 5265 | trans = btrfs_start_transaction(root, 0); |
| 5266 | if (IS_ERR(trans)) { |
| 5267 | ret = PTR_ERR(trans); |
| 5268 | goto out_unlock; |
| 5269 | } |
| 5270 | |
Anand Jain | a1b83ac | 2013-07-19 17:39:32 +0800 | [diff] [blame] | 5271 | spin_lock(&root->fs_info->super_lock); |
jeff.liu | a8bfd4a | 2013-01-05 02:48:08 +0000 | [diff] [blame] | 5272 | strcpy(super_block->label, label); |
Anand Jain | a1b83ac | 2013-07-19 17:39:32 +0800 | [diff] [blame] | 5273 | spin_unlock(&root->fs_info->super_lock); |
Jeff Mahoney | d0270ac | 2014-02-07 14:33:57 +0100 | [diff] [blame] | 5274 | ret = btrfs_commit_transaction(trans, root); |
jeff.liu | a8bfd4a | 2013-01-05 02:48:08 +0000 | [diff] [blame] | 5275 | |
| 5276 | out_unlock: |
jeff.liu | a8bfd4a | 2013-01-05 02:48:08 +0000 | [diff] [blame] | 5277 | mnt_drop_write_file(file); |
| 5278 | return ret; |
| 5279 | } |
| 5280 | |
Jeff Mahoney | 2eaa055 | 2013-11-15 15:33:55 -0500 | [diff] [blame] | 5281 | #define INIT_FEATURE_FLAGS(suffix) \ |
| 5282 | { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ |
| 5283 | .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ |
| 5284 | .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } |
| 5285 | |
| 5286 | static int btrfs_ioctl_get_supported_features(struct file *file, |
| 5287 | void __user *arg) |
| 5288 | { |
David Sterba | 4d4ab6d | 2015-11-19 11:42:31 +0100 | [diff] [blame] | 5289 | static const struct btrfs_ioctl_feature_flags features[3] = { |
Jeff Mahoney | 2eaa055 | 2013-11-15 15:33:55 -0500 | [diff] [blame] | 5290 | INIT_FEATURE_FLAGS(SUPP), |
| 5291 | INIT_FEATURE_FLAGS(SAFE_SET), |
| 5292 | INIT_FEATURE_FLAGS(SAFE_CLEAR) |
| 5293 | }; |
| 5294 | |
| 5295 | if (copy_to_user(arg, &features, sizeof(features))) |
| 5296 | return -EFAULT; |
| 5297 | |
| 5298 | return 0; |
| 5299 | } |
| 5300 | |
| 5301 | static int btrfs_ioctl_get_features(struct file *file, void __user *arg) |
| 5302 | { |
| 5303 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
| 5304 | struct btrfs_super_block *super_block = root->fs_info->super_copy; |
| 5305 | struct btrfs_ioctl_feature_flags features; |
| 5306 | |
| 5307 | features.compat_flags = btrfs_super_compat_flags(super_block); |
| 5308 | features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); |
| 5309 | features.incompat_flags = btrfs_super_incompat_flags(super_block); |
| 5310 | |
| 5311 | if (copy_to_user(arg, &features, sizeof(features))) |
| 5312 | return -EFAULT; |
| 5313 | |
| 5314 | return 0; |
| 5315 | } |
| 5316 | |
Jeff Mahoney | 3b02a68 | 2013-11-01 13:07:02 -0400 | [diff] [blame] | 5317 | static int check_feature_bits(struct btrfs_root *root, |
| 5318 | enum btrfs_feature_set set, |
Jeff Mahoney | 2eaa055 | 2013-11-15 15:33:55 -0500 | [diff] [blame] | 5319 | u64 change_mask, u64 flags, u64 supported_flags, |
| 5320 | u64 safe_set, u64 safe_clear) |
| 5321 | { |
Jeff Mahoney | 3b02a68 | 2013-11-01 13:07:02 -0400 | [diff] [blame] | 5322 | const char *type = btrfs_feature_set_names[set]; |
| 5323 | char *names; |
Jeff Mahoney | 2eaa055 | 2013-11-15 15:33:55 -0500 | [diff] [blame] | 5324 | u64 disallowed, unsupported; |
| 5325 | u64 set_mask = flags & change_mask; |
| 5326 | u64 clear_mask = ~flags & change_mask; |
| 5327 | |
| 5328 | unsupported = set_mask & ~supported_flags; |
| 5329 | if (unsupported) { |
Jeff Mahoney | 3b02a68 | 2013-11-01 13:07:02 -0400 | [diff] [blame] | 5330 | names = btrfs_printable_features(set, unsupported); |
| 5331 | if (names) { |
| 5332 | btrfs_warn(root->fs_info, |
| 5333 | "this kernel does not support the %s feature bit%s", |
| 5334 | names, strchr(names, ',') ? "s" : ""); |
| 5335 | kfree(names); |
| 5336 | } else |
| 5337 | btrfs_warn(root->fs_info, |
Jeff Mahoney | 2eaa055 | 2013-11-15 15:33:55 -0500 | [diff] [blame] | 5338 | "this kernel does not support %s bits 0x%llx", |
| 5339 | type, unsupported); |
| 5340 | return -EOPNOTSUPP; |
| 5341 | } |
| 5342 | |
| 5343 | disallowed = set_mask & ~safe_set; |
| 5344 | if (disallowed) { |
Jeff Mahoney | 3b02a68 | 2013-11-01 13:07:02 -0400 | [diff] [blame] | 5345 | names = btrfs_printable_features(set, disallowed); |
| 5346 | if (names) { |
| 5347 | btrfs_warn(root->fs_info, |
| 5348 | "can't set the %s feature bit%s while mounted", |
| 5349 | names, strchr(names, ',') ? "s" : ""); |
| 5350 | kfree(names); |
| 5351 | } else |
| 5352 | btrfs_warn(root->fs_info, |
Jeff Mahoney | 2eaa055 | 2013-11-15 15:33:55 -0500 | [diff] [blame] | 5353 | "can't set %s bits 0x%llx while mounted", |
| 5354 | type, disallowed); |
| 5355 | return -EPERM; |
| 5356 | } |
| 5357 | |
| 5358 | disallowed = clear_mask & ~safe_clear; |
| 5359 | if (disallowed) { |
Jeff Mahoney | 3b02a68 | 2013-11-01 13:07:02 -0400 | [diff] [blame] | 5360 | names = btrfs_printable_features(set, disallowed); |
| 5361 | if (names) { |
| 5362 | btrfs_warn(root->fs_info, |
| 5363 | "can't clear the %s feature bit%s while mounted", |
| 5364 | names, strchr(names, ',') ? "s" : ""); |
| 5365 | kfree(names); |
| 5366 | } else |
| 5367 | btrfs_warn(root->fs_info, |
Jeff Mahoney | 2eaa055 | 2013-11-15 15:33:55 -0500 | [diff] [blame] | 5368 | "can't clear %s bits 0x%llx while mounted", |
| 5369 | type, disallowed); |
| 5370 | return -EPERM; |
| 5371 | } |
| 5372 | |
| 5373 | return 0; |
| 5374 | } |
| 5375 | |
| 5376 | #define check_feature(root, change_mask, flags, mask_base) \ |
Jeff Mahoney | 3b02a68 | 2013-11-01 13:07:02 -0400 | [diff] [blame] | 5377 | check_feature_bits(root, FEAT_##mask_base, change_mask, flags, \ |
Jeff Mahoney | 2eaa055 | 2013-11-15 15:33:55 -0500 | [diff] [blame] | 5378 | BTRFS_FEATURE_ ## mask_base ## _SUPP, \ |
| 5379 | BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ |
| 5380 | BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) |
| 5381 | |
| 5382 | static int btrfs_ioctl_set_features(struct file *file, void __user *arg) |
| 5383 | { |
| 5384 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
| 5385 | struct btrfs_super_block *super_block = root->fs_info->super_copy; |
| 5386 | struct btrfs_ioctl_feature_flags flags[2]; |
| 5387 | struct btrfs_trans_handle *trans; |
| 5388 | u64 newflags; |
| 5389 | int ret; |
| 5390 | |
| 5391 | if (!capable(CAP_SYS_ADMIN)) |
| 5392 | return -EPERM; |
| 5393 | |
| 5394 | if (copy_from_user(flags, arg, sizeof(flags))) |
| 5395 | return -EFAULT; |
| 5396 | |
| 5397 | /* Nothing to do */ |
| 5398 | if (!flags[0].compat_flags && !flags[0].compat_ro_flags && |
| 5399 | !flags[0].incompat_flags) |
| 5400 | return 0; |
| 5401 | |
| 5402 | ret = check_feature(root, flags[0].compat_flags, |
| 5403 | flags[1].compat_flags, COMPAT); |
| 5404 | if (ret) |
| 5405 | return ret; |
| 5406 | |
| 5407 | ret = check_feature(root, flags[0].compat_ro_flags, |
| 5408 | flags[1].compat_ro_flags, COMPAT_RO); |
| 5409 | if (ret) |
| 5410 | return ret; |
| 5411 | |
| 5412 | ret = check_feature(root, flags[0].incompat_flags, |
| 5413 | flags[1].incompat_flags, INCOMPAT); |
| 5414 | if (ret) |
| 5415 | return ret; |
| 5416 | |
David Sterba | 8051aa1 | 2014-02-07 14:34:04 +0100 | [diff] [blame] | 5417 | trans = btrfs_start_transaction(root, 0); |
Jeff Mahoney | 2eaa055 | 2013-11-15 15:33:55 -0500 | [diff] [blame] | 5418 | if (IS_ERR(trans)) |
| 5419 | return PTR_ERR(trans); |
| 5420 | |
| 5421 | spin_lock(&root->fs_info->super_lock); |
| 5422 | newflags = btrfs_super_compat_flags(super_block); |
| 5423 | newflags |= flags[0].compat_flags & flags[1].compat_flags; |
| 5424 | newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); |
| 5425 | btrfs_set_super_compat_flags(super_block, newflags); |
| 5426 | |
| 5427 | newflags = btrfs_super_compat_ro_flags(super_block); |
| 5428 | newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; |
| 5429 | newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); |
| 5430 | btrfs_set_super_compat_ro_flags(super_block, newflags); |
| 5431 | |
| 5432 | newflags = btrfs_super_incompat_flags(super_block); |
| 5433 | newflags |= flags[0].incompat_flags & flags[1].incompat_flags; |
| 5434 | newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); |
| 5435 | btrfs_set_super_incompat_flags(super_block, newflags); |
| 5436 | spin_unlock(&root->fs_info->super_lock); |
| 5437 | |
Jeff Mahoney | d0270ac | 2014-02-07 14:33:57 +0100 | [diff] [blame] | 5438 | return btrfs_commit_transaction(trans, root); |
Jeff Mahoney | 2eaa055 | 2013-11-15 15:33:55 -0500 | [diff] [blame] | 5439 | } |
| 5440 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 5441 | long btrfs_ioctl(struct file *file, unsigned int |
| 5442 | cmd, unsigned long arg) |
| 5443 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 5444 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
Christoph Hellwig | 4bcabaa | 2008-12-02 06:36:08 -0500 | [diff] [blame] | 5445 | void __user *argp = (void __user *)arg; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 5446 | |
| 5447 | switch (cmd) { |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 5448 | case FS_IOC_GETFLAGS: |
| 5449 | return btrfs_ioctl_getflags(file, argp); |
| 5450 | case FS_IOC_SETFLAGS: |
| 5451 | return btrfs_ioctl_setflags(file, argp); |
| 5452 | case FS_IOC_GETVERSION: |
| 5453 | return btrfs_ioctl_getversion(file, argp); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 5454 | case FITRIM: |
| 5455 | return btrfs_ioctl_fitrim(file, argp); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 5456 | case BTRFS_IOC_SNAP_CREATE: |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 5457 | return btrfs_ioctl_snap_create(file, argp, 0); |
Li Zefan | fdfb1e4 | 2010-12-10 06:41:56 +0000 | [diff] [blame] | 5458 | case BTRFS_IOC_SNAP_CREATE_V2: |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 5459 | return btrfs_ioctl_snap_create_v2(file, argp, 0); |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 5460 | case BTRFS_IOC_SUBVOL_CREATE: |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 5461 | return btrfs_ioctl_snap_create(file, argp, 1); |
Arne Jansen | 6f72c7e | 2011-09-14 15:58:21 +0200 | [diff] [blame] | 5462 | case BTRFS_IOC_SUBVOL_CREATE_V2: |
| 5463 | return btrfs_ioctl_snap_create_v2(file, argp, 1); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 5464 | case BTRFS_IOC_SNAP_DESTROY: |
| 5465 | return btrfs_ioctl_snap_destroy(file, argp); |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 5466 | case BTRFS_IOC_SUBVOL_GETFLAGS: |
| 5467 | return btrfs_ioctl_subvol_getflags(file, argp); |
| 5468 | case BTRFS_IOC_SUBVOL_SETFLAGS: |
| 5469 | return btrfs_ioctl_subvol_setflags(file, argp); |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 5470 | case BTRFS_IOC_DEFAULT_SUBVOL: |
| 5471 | return btrfs_ioctl_default_subvol(file, argp); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 5472 | case BTRFS_IOC_DEFRAG: |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 5473 | return btrfs_ioctl_defrag(file, NULL); |
| 5474 | case BTRFS_IOC_DEFRAG_RANGE: |
| 5475 | return btrfs_ioctl_defrag(file, argp); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 5476 | case BTRFS_IOC_RESIZE: |
Miao Xie | 198605a | 2012-11-26 08:43:45 +0000 | [diff] [blame] | 5477 | return btrfs_ioctl_resize(file, argp); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 5478 | case BTRFS_IOC_ADD_DEV: |
Christoph Hellwig | 4bcabaa | 2008-12-02 06:36:08 -0500 | [diff] [blame] | 5479 | return btrfs_ioctl_add_dev(root, argp); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 5480 | case BTRFS_IOC_RM_DEV: |
Miao Xie | da24927 | 2012-11-26 08:44:50 +0000 | [diff] [blame] | 5481 | return btrfs_ioctl_rm_dev(file, argp); |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 5482 | case BTRFS_IOC_FS_INFO: |
| 5483 | return btrfs_ioctl_fs_info(root, argp); |
| 5484 | case BTRFS_IOC_DEV_INFO: |
| 5485 | return btrfs_ioctl_dev_info(root, argp); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 5486 | case BTRFS_IOC_BALANCE: |
Liu Bo | 9ba1f6e | 2012-05-11 18:11:26 +0800 | [diff] [blame] | 5487 | return btrfs_ioctl_balance(file, NULL); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 5488 | case BTRFS_IOC_CLONE: |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 5489 | return btrfs_ioctl_clone(file, arg, 0, 0, 0); |
| 5490 | case BTRFS_IOC_CLONE_RANGE: |
Christoph Hellwig | 7a865e8 | 2008-12-02 09:52:24 -0500 | [diff] [blame] | 5491 | return btrfs_ioctl_clone_range(file, argp); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 5492 | case BTRFS_IOC_TRANS_START: |
| 5493 | return btrfs_ioctl_trans_start(file); |
| 5494 | case BTRFS_IOC_TRANS_END: |
| 5495 | return btrfs_ioctl_trans_end(file); |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 5496 | case BTRFS_IOC_TREE_SEARCH: |
| 5497 | return btrfs_ioctl_tree_search(file, argp); |
Gerhard Heift | cc68a8a | 2014-01-30 16:24:03 +0100 | [diff] [blame] | 5498 | case BTRFS_IOC_TREE_SEARCH_V2: |
| 5499 | return btrfs_ioctl_tree_search_v2(file, argp); |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 5500 | case BTRFS_IOC_INO_LOOKUP: |
| 5501 | return btrfs_ioctl_ino_lookup(file, argp); |
Jan Schmidt | d7728c9 | 2011-07-07 16:48:38 +0200 | [diff] [blame] | 5502 | case BTRFS_IOC_INO_PATHS: |
| 5503 | return btrfs_ioctl_ino_to_path(root, argp); |
| 5504 | case BTRFS_IOC_LOGICAL_INO: |
| 5505 | return btrfs_ioctl_logical_to_ino(root, argp); |
Josef Bacik | 1406e43 | 2010-01-13 18:19:06 +0000 | [diff] [blame] | 5506 | case BTRFS_IOC_SPACE_INFO: |
| 5507 | return btrfs_ioctl_space_info(root, argp); |
Filipe David Borba Manana | 9b19985 | 2013-09-23 11:35:11 +0100 | [diff] [blame] | 5508 | case BTRFS_IOC_SYNC: { |
| 5509 | int ret; |
| 5510 | |
Miao Xie | 6c255e6 | 2014-03-06 13:55:01 +0800 | [diff] [blame] | 5511 | ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1); |
Filipe David Borba Manana | 9b19985 | 2013-09-23 11:35:11 +0100 | [diff] [blame] | 5512 | if (ret) |
| 5513 | return ret; |
Al Viro | ddb52f4 | 2014-10-21 20:21:18 -0400 | [diff] [blame] | 5514 | ret = btrfs_sync_fs(file_inode(file)->i_sb, 1); |
David Sterba | 2fad4e8 | 2014-07-23 14:39:35 +0200 | [diff] [blame] | 5515 | /* |
| 5516 | * The transaction thread may want to do more work, |
| 5517 | * namely it pokes the cleaner ktread that will start |
| 5518 | * processing uncleaned subvols. |
| 5519 | */ |
| 5520 | wake_up_process(root->fs_info->transaction_kthread); |
Filipe David Borba Manana | 9b19985 | 2013-09-23 11:35:11 +0100 | [diff] [blame] | 5521 | return ret; |
| 5522 | } |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 5523 | case BTRFS_IOC_START_SYNC: |
Miao Xie | 9a8c28b | 2012-11-26 08:40:43 +0000 | [diff] [blame] | 5524 | return btrfs_ioctl_start_sync(root, argp); |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 5525 | case BTRFS_IOC_WAIT_SYNC: |
Miao Xie | 9a8c28b | 2012-11-26 08:40:43 +0000 | [diff] [blame] | 5526 | return btrfs_ioctl_wait_sync(root, argp); |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 5527 | case BTRFS_IOC_SCRUB: |
Miao Xie | b8e9548 | 2012-11-26 08:48:01 +0000 | [diff] [blame] | 5528 | return btrfs_ioctl_scrub(file, argp); |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 5529 | case BTRFS_IOC_SCRUB_CANCEL: |
| 5530 | return btrfs_ioctl_scrub_cancel(root, argp); |
| 5531 | case BTRFS_IOC_SCRUB_PROGRESS: |
| 5532 | return btrfs_ioctl_scrub_progress(root, argp); |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 5533 | case BTRFS_IOC_BALANCE_V2: |
Liu Bo | 9ba1f6e | 2012-05-11 18:11:26 +0800 | [diff] [blame] | 5534 | return btrfs_ioctl_balance(file, argp); |
Ilya Dryomov | 837d5b6 | 2012-01-16 22:04:49 +0200 | [diff] [blame] | 5535 | case BTRFS_IOC_BALANCE_CTL: |
| 5536 | return btrfs_ioctl_balance_ctl(root, arg); |
Ilya Dryomov | 19a39dc | 2012-01-16 22:04:49 +0200 | [diff] [blame] | 5537 | case BTRFS_IOC_BALANCE_PROGRESS: |
| 5538 | return btrfs_ioctl_balance_progress(root, argp); |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 5539 | case BTRFS_IOC_SET_RECEIVED_SUBVOL: |
| 5540 | return btrfs_ioctl_set_received_subvol(file, argp); |
Hugo Mills | abccd00 | 2014-01-30 20:17:00 +0000 | [diff] [blame] | 5541 | #ifdef CONFIG_64BIT |
| 5542 | case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: |
| 5543 | return btrfs_ioctl_set_received_subvol_32(file, argp); |
| 5544 | #endif |
Alexander Block | 31db9f7 | 2012-07-25 23:19:24 +0200 | [diff] [blame] | 5545 | case BTRFS_IOC_SEND: |
| 5546 | return btrfs_ioctl_send(file, argp); |
Stefan Behrens | c11d2c2 | 2012-05-25 16:06:09 +0200 | [diff] [blame] | 5547 | case BTRFS_IOC_GET_DEV_STATS: |
David Sterba | b27f7c0 | 2012-06-22 06:30:39 -0600 | [diff] [blame] | 5548 | return btrfs_ioctl_get_dev_stats(root, argp); |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 5549 | case BTRFS_IOC_QUOTA_CTL: |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 5550 | return btrfs_ioctl_quota_ctl(file, argp); |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 5551 | case BTRFS_IOC_QGROUP_ASSIGN: |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 5552 | return btrfs_ioctl_qgroup_assign(file, argp); |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 5553 | case BTRFS_IOC_QGROUP_CREATE: |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 5554 | return btrfs_ioctl_qgroup_create(file, argp); |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 5555 | case BTRFS_IOC_QGROUP_LIMIT: |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 5556 | return btrfs_ioctl_qgroup_limit(file, argp); |
Jan Schmidt | 2f23203 | 2013-04-25 16:04:51 +0000 | [diff] [blame] | 5557 | case BTRFS_IOC_QUOTA_RESCAN: |
| 5558 | return btrfs_ioctl_quota_rescan(file, argp); |
| 5559 | case BTRFS_IOC_QUOTA_RESCAN_STATUS: |
| 5560 | return btrfs_ioctl_quota_rescan_status(file, argp); |
Jan Schmidt | 57254b6e | 2013-05-06 19:14:17 +0000 | [diff] [blame] | 5561 | case BTRFS_IOC_QUOTA_RESCAN_WAIT: |
| 5562 | return btrfs_ioctl_quota_rescan_wait(file, argp); |
Stefan Behrens | 3f6bcfb | 2012-11-06 15:08:53 +0100 | [diff] [blame] | 5563 | case BTRFS_IOC_DEV_REPLACE: |
| 5564 | return btrfs_ioctl_dev_replace(root, argp); |
jeff.liu | 867ab66 | 2013-01-05 02:48:01 +0000 | [diff] [blame] | 5565 | case BTRFS_IOC_GET_FSLABEL: |
| 5566 | return btrfs_ioctl_get_fslabel(file, argp); |
jeff.liu | a8bfd4a | 2013-01-05 02:48:08 +0000 | [diff] [blame] | 5567 | case BTRFS_IOC_SET_FSLABEL: |
| 5568 | return btrfs_ioctl_set_fslabel(file, argp); |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 5569 | case BTRFS_IOC_FILE_EXTENT_SAME: |
| 5570 | return btrfs_ioctl_file_extent_same(file, argp); |
Jeff Mahoney | 2eaa055 | 2013-11-15 15:33:55 -0500 | [diff] [blame] | 5571 | case BTRFS_IOC_GET_SUPPORTED_FEATURES: |
| 5572 | return btrfs_ioctl_get_supported_features(file, argp); |
| 5573 | case BTRFS_IOC_GET_FEATURES: |
| 5574 | return btrfs_ioctl_get_features(file, argp); |
| 5575 | case BTRFS_IOC_SET_FEATURES: |
| 5576 | return btrfs_ioctl_set_features(file, argp); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 5577 | } |
| 5578 | |
| 5579 | return -ENOTTY; |
| 5580 | } |