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" |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 61 | |
Hugo Mills | abccd00 | 2014-01-30 20:17:00 +0000 | [diff] [blame] | 62 | #ifdef CONFIG_64BIT |
| 63 | /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI |
| 64 | * structures are incorrect, as the timespec structure from userspace |
| 65 | * is 4 bytes too small. We define these alternatives here to teach |
| 66 | * the kernel about the 32-bit struct packing. |
| 67 | */ |
| 68 | struct btrfs_ioctl_timespec_32 { |
| 69 | __u64 sec; |
| 70 | __u32 nsec; |
| 71 | } __attribute__ ((__packed__)); |
| 72 | |
| 73 | struct btrfs_ioctl_received_subvol_args_32 { |
| 74 | char uuid[BTRFS_UUID_SIZE]; /* in */ |
| 75 | __u64 stransid; /* in */ |
| 76 | __u64 rtransid; /* out */ |
| 77 | struct btrfs_ioctl_timespec_32 stime; /* in */ |
| 78 | struct btrfs_ioctl_timespec_32 rtime; /* out */ |
| 79 | __u64 flags; /* in */ |
| 80 | __u64 reserved[16]; /* in */ |
| 81 | } __attribute__ ((__packed__)); |
| 82 | |
| 83 | #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \ |
| 84 | struct btrfs_ioctl_received_subvol_args_32) |
| 85 | #endif |
| 86 | |
| 87 | |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 88 | static int btrfs_clone(struct inode *src, struct inode *inode, |
| 89 | u64 off, u64 olen, u64 olen_aligned, u64 destoff); |
| 90 | |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 91 | /* Mask out flags that are inappropriate for the given type of inode. */ |
| 92 | static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) |
| 93 | { |
| 94 | if (S_ISDIR(mode)) |
| 95 | return flags; |
| 96 | else if (S_ISREG(mode)) |
| 97 | return flags & ~FS_DIRSYNC_FL; |
| 98 | else |
| 99 | return flags & (FS_NODUMP_FL | FS_NOATIME_FL); |
| 100 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 101 | |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 102 | /* |
| 103 | * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. |
| 104 | */ |
| 105 | static unsigned int btrfs_flags_to_ioctl(unsigned int flags) |
| 106 | { |
| 107 | unsigned int iflags = 0; |
| 108 | |
| 109 | if (flags & BTRFS_INODE_SYNC) |
| 110 | iflags |= FS_SYNC_FL; |
| 111 | if (flags & BTRFS_INODE_IMMUTABLE) |
| 112 | iflags |= FS_IMMUTABLE_FL; |
| 113 | if (flags & BTRFS_INODE_APPEND) |
| 114 | iflags |= FS_APPEND_FL; |
| 115 | if (flags & BTRFS_INODE_NODUMP) |
| 116 | iflags |= FS_NODUMP_FL; |
| 117 | if (flags & BTRFS_INODE_NOATIME) |
| 118 | iflags |= FS_NOATIME_FL; |
| 119 | if (flags & BTRFS_INODE_DIRSYNC) |
| 120 | iflags |= FS_DIRSYNC_FL; |
Li Zefan | d0092bd | 2011-04-15 03:03:06 +0000 | [diff] [blame] | 121 | if (flags & BTRFS_INODE_NODATACOW) |
| 122 | iflags |= FS_NOCOW_FL; |
| 123 | |
| 124 | if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS)) |
| 125 | iflags |= FS_COMPR_FL; |
| 126 | else if (flags & BTRFS_INODE_NOCOMPRESS) |
| 127 | iflags |= FS_NOCOMP_FL; |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 128 | |
| 129 | return iflags; |
| 130 | } |
| 131 | |
| 132 | /* |
| 133 | * Update inode->i_flags based on the btrfs internal flags. |
| 134 | */ |
| 135 | void btrfs_update_iflags(struct inode *inode) |
| 136 | { |
| 137 | struct btrfs_inode *ip = BTRFS_I(inode); |
| 138 | |
| 139 | inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); |
| 140 | |
| 141 | if (ip->flags & BTRFS_INODE_SYNC) |
| 142 | inode->i_flags |= S_SYNC; |
| 143 | if (ip->flags & BTRFS_INODE_IMMUTABLE) |
| 144 | inode->i_flags |= S_IMMUTABLE; |
| 145 | if (ip->flags & BTRFS_INODE_APPEND) |
| 146 | inode->i_flags |= S_APPEND; |
| 147 | if (ip->flags & BTRFS_INODE_NOATIME) |
| 148 | inode->i_flags |= S_NOATIME; |
| 149 | if (ip->flags & BTRFS_INODE_DIRSYNC) |
| 150 | inode->i_flags |= S_DIRSYNC; |
| 151 | } |
| 152 | |
| 153 | /* |
| 154 | * Inherit flags from the parent inode. |
| 155 | * |
Josef Bacik | e27425d | 2011-09-27 11:01:30 -0400 | [diff] [blame] | 156 | * Currently only the compression flags and the cow flags are inherited. |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 157 | */ |
| 158 | void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) |
| 159 | { |
Chris Mason | 0b4dcea | 2009-06-11 11:13:35 -0400 | [diff] [blame] | 160 | unsigned int flags; |
| 161 | |
| 162 | if (!dir) |
| 163 | return; |
| 164 | |
| 165 | flags = BTRFS_I(dir)->flags; |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 166 | |
Josef Bacik | e27425d | 2011-09-27 11:01:30 -0400 | [diff] [blame] | 167 | if (flags & BTRFS_INODE_NOCOMPRESS) { |
| 168 | BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS; |
| 169 | BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; |
| 170 | } else if (flags & BTRFS_INODE_COMPRESS) { |
| 171 | BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS; |
| 172 | BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS; |
| 173 | } |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 174 | |
Liu Bo | 213490b | 2012-09-11 08:33:50 -0600 | [diff] [blame] | 175 | if (flags & BTRFS_INODE_NODATACOW) { |
Josef Bacik | e27425d | 2011-09-27 11:01:30 -0400 | [diff] [blame] | 176 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; |
Liu Bo | 213490b | 2012-09-11 08:33:50 -0600 | [diff] [blame] | 177 | if (S_ISREG(inode->i_mode)) |
| 178 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM; |
| 179 | } |
Josef Bacik | e27425d | 2011-09-27 11:01:30 -0400 | [diff] [blame] | 180 | |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 181 | btrfs_update_iflags(inode); |
| 182 | } |
| 183 | |
| 184 | static int btrfs_ioctl_getflags(struct file *file, void __user *arg) |
| 185 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 186 | struct btrfs_inode *ip = BTRFS_I(file_inode(file)); |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 187 | unsigned int flags = btrfs_flags_to_ioctl(ip->flags); |
| 188 | |
| 189 | if (copy_to_user(arg, &flags, sizeof(flags))) |
| 190 | return -EFAULT; |
| 191 | return 0; |
| 192 | } |
| 193 | |
Liu Bo | 75e7cb7 | 2011-03-22 10:12:20 +0000 | [diff] [blame] | 194 | static int check_flags(unsigned int flags) |
| 195 | { |
| 196 | if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ |
| 197 | FS_NOATIME_FL | FS_NODUMP_FL | \ |
| 198 | FS_SYNC_FL | FS_DIRSYNC_FL | \ |
Li Zefan | e1e8fb6 | 2011-04-15 03:02:49 +0000 | [diff] [blame] | 199 | FS_NOCOMP_FL | FS_COMPR_FL | |
| 200 | FS_NOCOW_FL)) |
Liu Bo | 75e7cb7 | 2011-03-22 10:12:20 +0000 | [diff] [blame] | 201 | return -EOPNOTSUPP; |
| 202 | |
| 203 | if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) |
| 204 | return -EINVAL; |
| 205 | |
Liu Bo | 75e7cb7 | 2011-03-22 10:12:20 +0000 | [diff] [blame] | 206 | return 0; |
| 207 | } |
| 208 | |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 209 | static int btrfs_ioctl_setflags(struct file *file, void __user *arg) |
| 210 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 211 | struct inode *inode = file_inode(file); |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 212 | struct btrfs_inode *ip = BTRFS_I(inode); |
| 213 | struct btrfs_root *root = ip->root; |
| 214 | struct btrfs_trans_handle *trans; |
| 215 | unsigned int flags, oldflags; |
| 216 | int ret; |
Li Zefan | f062abf | 2011-12-29 13:36:45 +0800 | [diff] [blame] | 217 | u64 ip_oldflags; |
| 218 | unsigned int i_oldflags; |
David Sterba | 7e97b8d | 2012-09-07 05:56:55 -0600 | [diff] [blame] | 219 | umode_t mode; |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 220 | |
David Sterba | bd60ea0 | 2014-01-16 15:50:22 +0100 | [diff] [blame] | 221 | if (!inode_owner_or_capable(inode)) |
| 222 | return -EPERM; |
| 223 | |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 224 | if (btrfs_root_readonly(root)) |
| 225 | return -EROFS; |
| 226 | |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 227 | if (copy_from_user(&flags, arg, sizeof(flags))) |
| 228 | return -EFAULT; |
| 229 | |
Liu Bo | 75e7cb7 | 2011-03-22 10:12:20 +0000 | [diff] [blame] | 230 | ret = check_flags(flags); |
| 231 | if (ret) |
| 232 | return ret; |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 233 | |
Jan Kara | e784868 | 2012-06-12 16:20:32 +0200 | [diff] [blame] | 234 | ret = mnt_want_write_file(file); |
| 235 | if (ret) |
| 236 | return ret; |
| 237 | |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 238 | mutex_lock(&inode->i_mutex); |
| 239 | |
Li Zefan | f062abf | 2011-12-29 13:36:45 +0800 | [diff] [blame] | 240 | ip_oldflags = ip->flags; |
| 241 | i_oldflags = inode->i_flags; |
David Sterba | 7e97b8d | 2012-09-07 05:56:55 -0600 | [diff] [blame] | 242 | mode = inode->i_mode; |
Li Zefan | f062abf | 2011-12-29 13:36:45 +0800 | [diff] [blame] | 243 | |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 244 | flags = btrfs_mask_flags(inode->i_mode, flags); |
| 245 | oldflags = btrfs_flags_to_ioctl(ip->flags); |
| 246 | if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { |
| 247 | if (!capable(CAP_LINUX_IMMUTABLE)) { |
| 248 | ret = -EPERM; |
| 249 | goto out_unlock; |
| 250 | } |
| 251 | } |
| 252 | |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 253 | if (flags & FS_SYNC_FL) |
| 254 | ip->flags |= BTRFS_INODE_SYNC; |
| 255 | else |
| 256 | ip->flags &= ~BTRFS_INODE_SYNC; |
| 257 | if (flags & FS_IMMUTABLE_FL) |
| 258 | ip->flags |= BTRFS_INODE_IMMUTABLE; |
| 259 | else |
| 260 | ip->flags &= ~BTRFS_INODE_IMMUTABLE; |
| 261 | if (flags & FS_APPEND_FL) |
| 262 | ip->flags |= BTRFS_INODE_APPEND; |
| 263 | else |
| 264 | ip->flags &= ~BTRFS_INODE_APPEND; |
| 265 | if (flags & FS_NODUMP_FL) |
| 266 | ip->flags |= BTRFS_INODE_NODUMP; |
| 267 | else |
| 268 | ip->flags &= ~BTRFS_INODE_NODUMP; |
| 269 | if (flags & FS_NOATIME_FL) |
| 270 | ip->flags |= BTRFS_INODE_NOATIME; |
| 271 | else |
| 272 | ip->flags &= ~BTRFS_INODE_NOATIME; |
| 273 | if (flags & FS_DIRSYNC_FL) |
| 274 | ip->flags |= BTRFS_INODE_DIRSYNC; |
| 275 | else |
| 276 | ip->flags &= ~BTRFS_INODE_DIRSYNC; |
David Sterba | 7e97b8d | 2012-09-07 05:56:55 -0600 | [diff] [blame] | 277 | if (flags & FS_NOCOW_FL) { |
| 278 | if (S_ISREG(mode)) { |
| 279 | /* |
| 280 | * It's safe to turn csums off here, no extents exist. |
| 281 | * Otherwise we want the flag to reflect the real COW |
| 282 | * status of the file and will not set it. |
| 283 | */ |
| 284 | if (inode->i_size == 0) |
| 285 | ip->flags |= BTRFS_INODE_NODATACOW |
| 286 | | BTRFS_INODE_NODATASUM; |
| 287 | } else { |
| 288 | ip->flags |= BTRFS_INODE_NODATACOW; |
| 289 | } |
| 290 | } else { |
| 291 | /* |
| 292 | * Revert back under same assuptions as above |
| 293 | */ |
| 294 | if (S_ISREG(mode)) { |
| 295 | if (inode->i_size == 0) |
| 296 | ip->flags &= ~(BTRFS_INODE_NODATACOW |
| 297 | | BTRFS_INODE_NODATASUM); |
| 298 | } else { |
| 299 | ip->flags &= ~BTRFS_INODE_NODATACOW; |
| 300 | } |
| 301 | } |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 302 | |
Liu Bo | 75e7cb7 | 2011-03-22 10:12:20 +0000 | [diff] [blame] | 303 | /* |
| 304 | * The COMPRESS flag can only be changed by users, while the NOCOMPRESS |
| 305 | * flag may be changed automatically if compression code won't make |
| 306 | * things smaller. |
| 307 | */ |
| 308 | if (flags & FS_NOCOMP_FL) { |
| 309 | ip->flags &= ~BTRFS_INODE_COMPRESS; |
| 310 | ip->flags |= BTRFS_INODE_NOCOMPRESS; |
Filipe David Borba Manana | 6354192 | 2014-01-07 11:47:46 +0000 | [diff] [blame] | 311 | |
| 312 | ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0); |
| 313 | if (ret && ret != -ENODATA) |
| 314 | goto out_drop; |
Liu Bo | 75e7cb7 | 2011-03-22 10:12:20 +0000 | [diff] [blame] | 315 | } else if (flags & FS_COMPR_FL) { |
Filipe David Borba Manana | 6354192 | 2014-01-07 11:47:46 +0000 | [diff] [blame] | 316 | const char *comp; |
| 317 | |
Liu Bo | 75e7cb7 | 2011-03-22 10:12:20 +0000 | [diff] [blame] | 318 | ip->flags |= BTRFS_INODE_COMPRESS; |
| 319 | ip->flags &= ~BTRFS_INODE_NOCOMPRESS; |
Filipe David Borba Manana | 6354192 | 2014-01-07 11:47:46 +0000 | [diff] [blame] | 320 | |
| 321 | if (root->fs_info->compress_type == BTRFS_COMPRESS_LZO) |
| 322 | comp = "lzo"; |
| 323 | else |
| 324 | comp = "zlib"; |
| 325 | ret = btrfs_set_prop(inode, "btrfs.compression", |
| 326 | comp, strlen(comp), 0); |
| 327 | if (ret) |
| 328 | goto out_drop; |
| 329 | |
Li Zefan | ebcb904 | 2011-04-15 03:03:17 +0000 | [diff] [blame] | 330 | } else { |
| 331 | ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); |
Liu Bo | 75e7cb7 | 2011-03-22 10:12:20 +0000 | [diff] [blame] | 332 | } |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 333 | |
Li Zefan | 4da6f1a | 2011-12-29 13:39:50 +0800 | [diff] [blame] | 334 | trans = btrfs_start_transaction(root, 1); |
Li Zefan | f062abf | 2011-12-29 13:36:45 +0800 | [diff] [blame] | 335 | if (IS_ERR(trans)) { |
| 336 | ret = PTR_ERR(trans); |
| 337 | goto out_drop; |
| 338 | } |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 339 | |
Li Zefan | 306424cc | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 340 | btrfs_update_iflags(inode); |
Josef Bacik | 0c4d2d9 | 2012-04-05 15:03:02 -0400 | [diff] [blame] | 341 | inode_inc_iversion(inode); |
Li Zefan | 306424cc | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 342 | inode->i_ctime = CURRENT_TIME; |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 343 | ret = btrfs_update_inode(trans, root, inode); |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 344 | |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 345 | btrfs_end_transaction(trans, root); |
Li Zefan | f062abf | 2011-12-29 13:36:45 +0800 | [diff] [blame] | 346 | out_drop: |
| 347 | if (ret) { |
| 348 | ip->flags = ip_oldflags; |
| 349 | inode->i_flags = i_oldflags; |
| 350 | } |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 351 | |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 352 | out_unlock: |
| 353 | mutex_unlock(&inode->i_mutex); |
Jan Kara | e784868 | 2012-06-12 16:20:32 +0200 | [diff] [blame] | 354 | mnt_drop_write_file(file); |
liubo | 2d4e6f6 | 2011-02-24 09:38:16 +0000 | [diff] [blame] | 355 | return ret; |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 356 | } |
| 357 | |
| 358 | static int btrfs_ioctl_getversion(struct file *file, int __user *arg) |
| 359 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 360 | struct inode *inode = file_inode(file); |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 361 | |
| 362 | return put_user(inode->i_generation, arg); |
| 363 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 364 | |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 365 | static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) |
| 366 | { |
Al Viro | 54563d4 | 2013-09-01 15:57:51 -0400 | [diff] [blame] | 367 | 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] | 368 | struct btrfs_device *device; |
| 369 | struct request_queue *q; |
| 370 | struct fstrim_range range; |
| 371 | u64 minlen = ULLONG_MAX; |
| 372 | u64 num_devices = 0; |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 373 | u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 374 | int ret; |
| 375 | |
| 376 | if (!capable(CAP_SYS_ADMIN)) |
| 377 | return -EPERM; |
| 378 | |
Xiao Guangrong | 1f78160 | 2011-04-20 10:09:16 +0000 | [diff] [blame] | 379 | rcu_read_lock(); |
| 380 | list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, |
| 381 | dev_list) { |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 382 | if (!device->bdev) |
| 383 | continue; |
| 384 | q = bdev_get_queue(device->bdev); |
| 385 | if (blk_queue_discard(q)) { |
| 386 | num_devices++; |
| 387 | minlen = min((u64)q->limits.discard_granularity, |
| 388 | minlen); |
| 389 | } |
| 390 | } |
Xiao Guangrong | 1f78160 | 2011-04-20 10:09:16 +0000 | [diff] [blame] | 391 | rcu_read_unlock(); |
Lukas Czerner | f4c697e | 2011-09-05 16:34:54 +0200 | [diff] [blame] | 392 | |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 393 | if (!num_devices) |
| 394 | return -EOPNOTSUPP; |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 395 | if (copy_from_user(&range, arg, sizeof(range))) |
| 396 | return -EFAULT; |
Lukas Czerner | e515c18 | 2012-10-16 09:34:36 +0000 | [diff] [blame] | 397 | if (range.start > total_bytes || |
| 398 | range.len < fs_info->sb->s_blocksize) |
Lukas Czerner | f4c697e | 2011-09-05 16:34:54 +0200 | [diff] [blame] | 399 | return -EINVAL; |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 400 | |
Lukas Czerner | f4c697e | 2011-09-05 16:34:54 +0200 | [diff] [blame] | 401 | range.len = min(range.len, total_bytes - range.start); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 402 | range.minlen = max(range.minlen, minlen); |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 403 | ret = btrfs_trim_fs(fs_info->tree_root, &range); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 404 | if (ret < 0) |
| 405 | return ret; |
| 406 | |
| 407 | if (copy_to_user(arg, &range, sizeof(range))) |
| 408 | return -EFAULT; |
| 409 | |
| 410 | return 0; |
| 411 | } |
| 412 | |
Stefan Behrens | dd5f961 | 2013-08-15 17:11:20 +0200 | [diff] [blame] | 413 | int btrfs_is_empty_uuid(u8 *uuid) |
| 414 | { |
Chris Mason | 46e0f66 | 2013-11-15 12:14:55 +0100 | [diff] [blame] | 415 | int i; |
| 416 | |
| 417 | for (i = 0; i < BTRFS_UUID_SIZE; i++) { |
| 418 | if (uuid[i]) |
| 419 | return 0; |
| 420 | } |
| 421 | return 1; |
Stefan Behrens | dd5f961 | 2013-08-15 17:11:20 +0200 | [diff] [blame] | 422 | } |
| 423 | |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 424 | static noinline int create_subvol(struct inode *dir, |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 425 | struct dentry *dentry, |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 426 | char *name, int namelen, |
Arne Jansen | 6f72c7e | 2011-09-14 15:58:21 +0200 | [diff] [blame] | 427 | u64 *async_transid, |
Miao Xie | 8696c53 | 2013-02-07 06:02:44 +0000 | [diff] [blame] | 428 | struct btrfs_qgroup_inherit *inherit) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 429 | { |
| 430 | struct btrfs_trans_handle *trans; |
| 431 | struct btrfs_key key; |
| 432 | struct btrfs_root_item root_item; |
| 433 | struct btrfs_inode_item *inode_item; |
| 434 | struct extent_buffer *leaf; |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 435 | struct btrfs_root *root = BTRFS_I(dir)->root; |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 436 | struct btrfs_root *new_root; |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 437 | struct btrfs_block_rsv block_rsv; |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 438 | struct timespec cur_time = CURRENT_TIME; |
Tsutomu Itoh | 5662344b3 | 2013-12-13 09:51:42 +0900 | [diff] [blame] | 439 | struct inode *inode; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 440 | int ret; |
| 441 | int err; |
| 442 | u64 objectid; |
| 443 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 444 | u64 index = 0; |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 445 | u64 qgroup_reserved; |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 446 | uuid_le new_uuid; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 447 | |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 448 | ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid); |
Al Viro | 2fbe8c8 | 2011-07-16 21:38:06 -0400 | [diff] [blame] | 449 | if (ret) |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 450 | return ret; |
Josef Bacik | 6a91221 | 2010-11-20 09:48:00 +0000 | [diff] [blame] | 451 | |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 452 | btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 453 | /* |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 454 | * The same as the snapshot creation, please see the comment |
| 455 | * of create_snapshot(). |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 456 | */ |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 457 | ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, |
Stefan Behrens | dd5f961 | 2013-08-15 17:11:20 +0200 | [diff] [blame] | 458 | 8, &qgroup_reserved, false); |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 459 | if (ret) |
| 460 | return ret; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 461 | |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 462 | trans = btrfs_start_transaction(root, 0); |
| 463 | if (IS_ERR(trans)) { |
| 464 | ret = PTR_ERR(trans); |
Liu Bo | de6e820 | 2014-01-09 14:57:06 +0800 | [diff] [blame] | 465 | btrfs_subvolume_release_metadata(root, &block_rsv, |
| 466 | qgroup_reserved); |
| 467 | return ret; |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 468 | } |
| 469 | trans->block_rsv = &block_rsv; |
| 470 | trans->bytes_reserved = block_rsv.size; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 471 | |
Miao Xie | 8696c53 | 2013-02-07 06:02:44 +0000 | [diff] [blame] | 472 | ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit); |
Arne Jansen | 6f72c7e | 2011-09-14 15:58:21 +0200 | [diff] [blame] | 473 | if (ret) |
| 474 | goto fail; |
| 475 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 476 | leaf = btrfs_alloc_free_block(trans, root, root->leafsize, |
Jan Schmidt | 5581a51 | 2012-05-16 17:04:52 +0200 | [diff] [blame] | 477 | 0, objectid, NULL, 0, 0, 0); |
Josef Bacik | 8e8a1e3 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 478 | if (IS_ERR(leaf)) { |
| 479 | ret = PTR_ERR(leaf); |
| 480 | goto fail; |
| 481 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 482 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 483 | memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 484 | btrfs_set_header_bytenr(leaf, leaf->start); |
| 485 | btrfs_set_header_generation(leaf, trans->transid); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 486 | btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 487 | btrfs_set_header_owner(leaf, objectid); |
| 488 | |
Ross Kirk | 0a4e558 | 2013-09-24 10:12:38 +0100 | [diff] [blame] | 489 | write_extent_buffer(leaf, root->fs_info->fsid, btrfs_header_fsid(), |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 490 | BTRFS_FSID_SIZE); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 491 | write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, |
Geert Uytterhoeven | b308bc2 | 2013-08-20 13:20:15 +0200 | [diff] [blame] | 492 | btrfs_header_chunk_tree_uuid(leaf), |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 493 | BTRFS_UUID_SIZE); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 494 | btrfs_mark_buffer_dirty(leaf); |
| 495 | |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 496 | memset(&root_item, 0, sizeof(root_item)); |
| 497 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 498 | inode_item = &root_item.inode; |
Qu Wenruo | 3cae210 | 2013-07-16 11:19:18 +0800 | [diff] [blame] | 499 | btrfs_set_stack_inode_generation(inode_item, 1); |
| 500 | btrfs_set_stack_inode_size(inode_item, 3); |
| 501 | btrfs_set_stack_inode_nlink(inode_item, 1); |
| 502 | btrfs_set_stack_inode_nbytes(inode_item, root->leafsize); |
| 503 | btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 504 | |
Qu Wenruo | 3cae210 | 2013-07-16 11:19:18 +0800 | [diff] [blame] | 505 | btrfs_set_root_flags(&root_item, 0); |
| 506 | btrfs_set_root_limit(&root_item, 0); |
| 507 | btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); |
Li Zefan | 08fe4db | 2011-03-28 02:01:25 +0000 | [diff] [blame] | 508 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 509 | btrfs_set_root_bytenr(&root_item, leaf->start); |
Yan Zheng | 84234f3 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 510 | btrfs_set_root_generation(&root_item, trans->transid); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 511 | btrfs_set_root_level(&root_item, 0); |
| 512 | btrfs_set_root_refs(&root_item, 1); |
Yan, Zheng | 86b9f2e | 2009-11-12 09:36:50 +0000 | [diff] [blame] | 513 | btrfs_set_root_used(&root_item, leaf->len); |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 514 | btrfs_set_root_last_snapshot(&root_item, 0); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 515 | |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 516 | btrfs_set_root_generation_v2(&root_item, |
| 517 | btrfs_root_generation(&root_item)); |
| 518 | uuid_le_gen(&new_uuid); |
| 519 | memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE); |
Qu Wenruo | 3cae210 | 2013-07-16 11:19:18 +0800 | [diff] [blame] | 520 | btrfs_set_stack_timespec_sec(&root_item.otime, cur_time.tv_sec); |
| 521 | btrfs_set_stack_timespec_nsec(&root_item.otime, cur_time.tv_nsec); |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 522 | root_item.ctime = root_item.otime; |
| 523 | btrfs_set_root_ctransid(&root_item, trans->transid); |
| 524 | btrfs_set_root_otransid(&root_item, trans->transid); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 525 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 526 | btrfs_tree_unlock(leaf); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 527 | free_extent_buffer(leaf); |
| 528 | leaf = NULL; |
| 529 | |
| 530 | btrfs_set_root_dirid(&root_item, new_dirid); |
| 531 | |
| 532 | key.objectid = objectid; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 533 | key.offset = 0; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 534 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
| 535 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, |
| 536 | &root_item); |
| 537 | if (ret) |
| 538 | goto fail; |
| 539 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 540 | key.offset = (u64)-1; |
| 541 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 542 | if (IS_ERR(new_root)) { |
| 543 | btrfs_abort_transaction(trans, root, PTR_ERR(new_root)); |
| 544 | ret = PTR_ERR(new_root); |
| 545 | goto fail; |
| 546 | } |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 547 | |
| 548 | btrfs_record_root_in_trans(trans, new_root); |
| 549 | |
Filipe David Borba Manana | 6354192 | 2014-01-07 11:47:46 +0000 | [diff] [blame] | 550 | ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid); |
Mark Fasheh | ce59897 | 2011-07-26 11:32:23 -0700 | [diff] [blame] | 551 | if (ret) { |
| 552 | /* We potentially lose an unused inode item here */ |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 553 | btrfs_abort_transaction(trans, root, ret); |
Mark Fasheh | ce59897 | 2011-07-26 11:32:23 -0700 | [diff] [blame] | 554 | goto fail; |
| 555 | } |
| 556 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 557 | /* |
| 558 | * insert the directory item |
| 559 | */ |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 560 | ret = btrfs_set_inode_index(dir, &index); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 561 | if (ret) { |
| 562 | btrfs_abort_transaction(trans, root, ret); |
| 563 | goto fail; |
| 564 | } |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 565 | |
| 566 | ret = btrfs_insert_dir_item(trans, root, |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 567 | name, namelen, dir, &key, |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 568 | BTRFS_FT_DIR, index); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 569 | if (ret) { |
| 570 | btrfs_abort_transaction(trans, root, ret); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 571 | goto fail; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 572 | } |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 573 | |
Yan Zheng | 52c2617 | 2009-01-05 15:43:43 -0500 | [diff] [blame] | 574 | btrfs_i_size_write(dir, dir->i_size + namelen * 2); |
| 575 | ret = btrfs_update_inode(trans, root, dir); |
| 576 | BUG_ON(ret); |
| 577 | |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 578 | ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 579 | objectid, root->root_key.objectid, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 580 | btrfs_ino(dir), index, name, namelen); |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 581 | BUG_ON(ret); |
| 582 | |
Stefan Behrens | dd5f961 | 2013-08-15 17:11:20 +0200 | [diff] [blame] | 583 | ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, |
| 584 | root_item.uuid, BTRFS_UUID_KEY_SUBVOL, |
| 585 | objectid); |
| 586 | if (ret) |
| 587 | btrfs_abort_transaction(trans, root, ret); |
| 588 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 589 | fail: |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 590 | trans->block_rsv = NULL; |
| 591 | trans->bytes_reserved = 0; |
Liu Bo | de6e820 | 2014-01-09 14:57:06 +0800 | [diff] [blame] | 592 | btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); |
| 593 | |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 594 | if (async_transid) { |
| 595 | *async_transid = trans->transid; |
| 596 | err = btrfs_commit_transaction_async(trans, root, 1); |
Miao Xie | 00d71c9 | 2013-03-04 09:45:06 +0000 | [diff] [blame] | 597 | if (err) |
| 598 | err = btrfs_commit_transaction(trans, root); |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 599 | } else { |
| 600 | err = btrfs_commit_transaction(trans, root); |
| 601 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 602 | if (err && !ret) |
| 603 | ret = err; |
Chris Mason | 1a65e24 | 2013-02-06 12:06:02 -0500 | [diff] [blame] | 604 | |
Tsutomu Itoh | 5662344b3 | 2013-12-13 09:51:42 +0900 | [diff] [blame] | 605 | if (!ret) { |
| 606 | inode = btrfs_lookup_dentry(dir, dentry); |
Liu Bo | de6e820 | 2014-01-09 14:57:06 +0800 | [diff] [blame] | 607 | if (IS_ERR(inode)) |
| 608 | return PTR_ERR(inode); |
Tsutomu Itoh | 5662344b3 | 2013-12-13 09:51:42 +0900 | [diff] [blame] | 609 | d_instantiate(dentry, inode); |
| 610 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 611 | return ret; |
| 612 | } |
| 613 | |
Miao Xie | 8257b2d | 2014-03-06 13:38:19 +0800 | [diff] [blame] | 614 | static void btrfs_wait_nocow_write(struct btrfs_root *root) |
| 615 | { |
| 616 | s64 writers; |
| 617 | DEFINE_WAIT(wait); |
| 618 | |
| 619 | do { |
| 620 | prepare_to_wait(&root->subv_writers->wait, &wait, |
| 621 | TASK_UNINTERRUPTIBLE); |
| 622 | |
| 623 | writers = percpu_counter_sum(&root->subv_writers->counter); |
| 624 | if (writers) |
| 625 | schedule(); |
| 626 | |
| 627 | finish_wait(&root->subv_writers->wait, &wait); |
| 628 | } while (writers); |
| 629 | } |
| 630 | |
Miao Xie | e9662f7 | 2013-02-28 10:01:15 +0000 | [diff] [blame] | 631 | static int create_snapshot(struct btrfs_root *root, struct inode *dir, |
| 632 | struct dentry *dentry, char *name, int namelen, |
| 633 | u64 *async_transid, bool readonly, |
| 634 | struct btrfs_qgroup_inherit *inherit) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 635 | { |
Yan, Zheng | 2e4bfab | 2009-11-12 09:37:02 +0000 | [diff] [blame] | 636 | struct inode *inode; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 637 | struct btrfs_pending_snapshot *pending_snapshot; |
| 638 | struct btrfs_trans_handle *trans; |
Yan, Zheng | 2e4bfab | 2009-11-12 09:37:02 +0000 | [diff] [blame] | 639 | int ret; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 640 | |
| 641 | if (!root->ref_cows) |
| 642 | return -EINVAL; |
| 643 | |
Miao Xie | 8257b2d | 2014-03-06 13:38:19 +0800 | [diff] [blame] | 644 | atomic_inc(&root->will_be_snapshoted); |
| 645 | smp_mb__after_atomic_inc(); |
| 646 | btrfs_wait_nocow_write(root); |
| 647 | |
Miao Xie | 6a03843 | 2013-05-15 07:48:24 +0000 | [diff] [blame] | 648 | ret = btrfs_start_delalloc_inodes(root, 0); |
| 649 | if (ret) |
Miao Xie | 8257b2d | 2014-03-06 13:38:19 +0800 | [diff] [blame] | 650 | goto out; |
Miao Xie | 6a03843 | 2013-05-15 07:48:24 +0000 | [diff] [blame] | 651 | |
Miao Xie | b024419 | 2013-11-04 23:13:25 +0800 | [diff] [blame] | 652 | btrfs_wait_ordered_extents(root, -1); |
Miao Xie | 6a03843 | 2013-05-15 07:48:24 +0000 | [diff] [blame] | 653 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 654 | pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); |
Miao Xie | 8257b2d | 2014-03-06 13:38:19 +0800 | [diff] [blame] | 655 | if (!pending_snapshot) { |
| 656 | ret = -ENOMEM; |
| 657 | goto out; |
| 658 | } |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 659 | |
Miao Xie | 66d8f3d | 2012-09-06 04:02:28 -0600 | [diff] [blame] | 660 | btrfs_init_block_rsv(&pending_snapshot->block_rsv, |
| 661 | BTRFS_BLOCK_RSV_TEMP); |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 662 | /* |
| 663 | * 1 - parent dir inode |
| 664 | * 2 - dir entries |
| 665 | * 1 - root item |
| 666 | * 2 - root ref/backref |
| 667 | * 1 - root of snapshot |
Stefan Behrens | dd5f961 | 2013-08-15 17:11:20 +0200 | [diff] [blame] | 668 | * 1 - UUID item |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 669 | */ |
| 670 | ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, |
Stefan Behrens | dd5f961 | 2013-08-15 17:11:20 +0200 | [diff] [blame] | 671 | &pending_snapshot->block_rsv, 8, |
Jeff Mahoney | ee3441b | 2013-07-09 16:37:21 -0400 | [diff] [blame] | 672 | &pending_snapshot->qgroup_reserved, |
| 673 | false); |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 674 | if (ret) |
Miao Xie | 8257b2d | 2014-03-06 13:38:19 +0800 | [diff] [blame] | 675 | goto free; |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 676 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 677 | pending_snapshot->dentry = dentry; |
| 678 | pending_snapshot->root = root; |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 679 | pending_snapshot->readonly = readonly; |
Miao Xie | e9662f7 | 2013-02-28 10:01:15 +0000 | [diff] [blame] | 680 | pending_snapshot->dir = dir; |
Miao Xie | 8696c53 | 2013-02-07 06:02:44 +0000 | [diff] [blame] | 681 | pending_snapshot->inherit = inherit; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 682 | |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 683 | trans = btrfs_start_transaction(root, 0); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 684 | if (IS_ERR(trans)) { |
| 685 | ret = PTR_ERR(trans); |
| 686 | goto fail; |
| 687 | } |
| 688 | |
Josef Bacik | 8351583 | 2011-06-14 15:16:14 -0400 | [diff] [blame] | 689 | spin_lock(&root->fs_info->trans_lock); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 690 | list_add(&pending_snapshot->list, |
| 691 | &trans->transaction->pending_snapshots); |
Josef Bacik | 8351583 | 2011-06-14 15:16:14 -0400 | [diff] [blame] | 692 | spin_unlock(&root->fs_info->trans_lock); |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 693 | if (async_transid) { |
| 694 | *async_transid = trans->transid; |
| 695 | ret = btrfs_commit_transaction_async(trans, |
| 696 | root->fs_info->extent_root, 1); |
Miao Xie | 00d71c9 | 2013-03-04 09:45:06 +0000 | [diff] [blame] | 697 | if (ret) |
| 698 | ret = btrfs_commit_transaction(trans, root); |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 699 | } else { |
| 700 | ret = btrfs_commit_transaction(trans, |
| 701 | root->fs_info->extent_root); |
| 702 | } |
Miao Xie | aec8030 | 2013-03-04 09:44:29 +0000 | [diff] [blame] | 703 | if (ret) |
Josef Bacik | c37b2b6 | 2012-10-22 15:51:44 -0400 | [diff] [blame] | 704 | goto fail; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 705 | |
| 706 | ret = pending_snapshot->error; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 707 | if (ret) |
Yan, Zheng | 2e4bfab | 2009-11-12 09:37:02 +0000 | [diff] [blame] | 708 | goto fail; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 709 | |
Josef Bacik | 66b4ffd | 2011-01-31 16:22:42 -0500 | [diff] [blame] | 710 | ret = btrfs_orphan_cleanup(pending_snapshot->snap); |
| 711 | if (ret) |
| 712 | goto fail; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 713 | |
Al Viro | 2fbe8c8 | 2011-07-16 21:38:06 -0400 | [diff] [blame] | 714 | inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); |
Yan, Zheng | 2e4bfab | 2009-11-12 09:37:02 +0000 | [diff] [blame] | 715 | if (IS_ERR(inode)) { |
| 716 | ret = PTR_ERR(inode); |
| 717 | goto fail; |
| 718 | } |
Tsutomu Itoh | 5662344b3 | 2013-12-13 09:51:42 +0900 | [diff] [blame] | 719 | |
Yan, Zheng | 2e4bfab | 2009-11-12 09:37:02 +0000 | [diff] [blame] | 720 | d_instantiate(dentry, inode); |
| 721 | ret = 0; |
| 722 | fail: |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 723 | btrfs_subvolume_release_metadata(BTRFS_I(dir)->root, |
| 724 | &pending_snapshot->block_rsv, |
| 725 | pending_snapshot->qgroup_reserved); |
Miao Xie | 8257b2d | 2014-03-06 13:38:19 +0800 | [diff] [blame] | 726 | free: |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 727 | kfree(pending_snapshot); |
Miao Xie | 8257b2d | 2014-03-06 13:38:19 +0800 | [diff] [blame] | 728 | out: |
| 729 | atomic_dec(&root->will_be_snapshoted); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 730 | return ret; |
| 731 | } |
| 732 | |
Sage Weil | 4260f7c | 2010-10-29 15:46:43 -0400 | [diff] [blame] | 733 | /* copy of check_sticky in fs/namei.c() |
| 734 | * It's inline, so penalty for filesystems that don't use sticky bit is |
| 735 | * minimal. |
| 736 | */ |
| 737 | static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) |
| 738 | { |
Eric W. Biederman | 2f2f43d | 2012-02-10 11:05:07 -0800 | [diff] [blame] | 739 | kuid_t fsuid = current_fsuid(); |
Sage Weil | 4260f7c | 2010-10-29 15:46:43 -0400 | [diff] [blame] | 740 | |
| 741 | if (!(dir->i_mode & S_ISVTX)) |
| 742 | return 0; |
Eric W. Biederman | 2f2f43d | 2012-02-10 11:05:07 -0800 | [diff] [blame] | 743 | if (uid_eq(inode->i_uid, fsuid)) |
Sage Weil | 4260f7c | 2010-10-29 15:46:43 -0400 | [diff] [blame] | 744 | return 0; |
Eric W. Biederman | 2f2f43d | 2012-02-10 11:05:07 -0800 | [diff] [blame] | 745 | if (uid_eq(dir->i_uid, fsuid)) |
Sage Weil | 4260f7c | 2010-10-29 15:46:43 -0400 | [diff] [blame] | 746 | return 0; |
| 747 | return !capable(CAP_FOWNER); |
| 748 | } |
| 749 | |
| 750 | /* copy of may_delete in fs/namei.c() |
| 751 | * Check whether we can remove a link victim from directory dir, check |
| 752 | * whether the type of victim is right. |
| 753 | * 1. We can't do it if dir is read-only (done in permission()) |
| 754 | * 2. We should have write and exec permissions on dir |
| 755 | * 3. We can't remove anything from append-only dir |
| 756 | * 4. We can't do anything with immutable dir (done in permission()) |
| 757 | * 5. If the sticky bit on dir is set we should either |
| 758 | * a. be owner of dir, or |
| 759 | * b. be owner of victim, or |
| 760 | * c. have CAP_FOWNER capability |
| 761 | * 6. If the victim is append-only or immutable we can't do antyhing with |
| 762 | * links pointing to it. |
| 763 | * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. |
| 764 | * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. |
| 765 | * 9. We can't remove a root or mountpoint. |
| 766 | * 10. We don't allow removal of NFS sillyrenamed files; it's handled by |
| 767 | * nfs_async_unlink(). |
| 768 | */ |
| 769 | |
Dulshani Gunawardhana | 6787125 | 2013-10-31 10:33:04 +0530 | [diff] [blame] | 770 | 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] | 771 | { |
| 772 | int error; |
| 773 | |
| 774 | if (!victim->d_inode) |
| 775 | return -ENOENT; |
| 776 | |
| 777 | BUG_ON(victim->d_parent->d_inode != dir); |
Jeff Layton | 4fa6b5e | 2012-10-10 15:25:25 -0400 | [diff] [blame] | 778 | audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); |
Sage Weil | 4260f7c | 2010-10-29 15:46:43 -0400 | [diff] [blame] | 779 | |
| 780 | error = inode_permission(dir, MAY_WRITE | MAY_EXEC); |
| 781 | if (error) |
| 782 | return error; |
| 783 | if (IS_APPEND(dir)) |
| 784 | return -EPERM; |
| 785 | if (btrfs_check_sticky(dir, victim->d_inode)|| |
| 786 | IS_APPEND(victim->d_inode)|| |
| 787 | IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) |
| 788 | return -EPERM; |
| 789 | if (isdir) { |
| 790 | if (!S_ISDIR(victim->d_inode->i_mode)) |
| 791 | return -ENOTDIR; |
| 792 | if (IS_ROOT(victim)) |
| 793 | return -EBUSY; |
| 794 | } else if (S_ISDIR(victim->d_inode->i_mode)) |
| 795 | return -EISDIR; |
| 796 | if (IS_DEADDIR(dir)) |
| 797 | return -ENOENT; |
| 798 | if (victim->d_flags & DCACHE_NFSFS_RENAMED) |
| 799 | return -EBUSY; |
| 800 | return 0; |
| 801 | } |
| 802 | |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 803 | /* copy of may_create in fs/namei.c() */ |
| 804 | static inline int btrfs_may_create(struct inode *dir, struct dentry *child) |
| 805 | { |
| 806 | if (child->d_inode) |
| 807 | return -EEXIST; |
| 808 | if (IS_DEADDIR(dir)) |
| 809 | return -ENOENT; |
| 810 | return inode_permission(dir, MAY_WRITE | MAY_EXEC); |
| 811 | } |
| 812 | |
| 813 | /* |
| 814 | * Create a new subvolume below @parent. This is largely modeled after |
| 815 | * sys_mkdirat and vfs_mkdir, but we only do a single component lookup |
| 816 | * inside this filesystem so it's quite a bit simpler. |
| 817 | */ |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 818 | static noinline int btrfs_mksubvol(struct path *parent, |
| 819 | char *name, int namelen, |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 820 | struct btrfs_root *snap_src, |
Arne Jansen | 6f72c7e | 2011-09-14 15:58:21 +0200 | [diff] [blame] | 821 | u64 *async_transid, bool readonly, |
Miao Xie | 8696c53 | 2013-02-07 06:02:44 +0000 | [diff] [blame] | 822 | struct btrfs_qgroup_inherit *inherit) |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 823 | { |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 824 | struct inode *dir = parent->dentry->d_inode; |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 825 | struct dentry *dentry; |
| 826 | int error; |
| 827 | |
David Sterba | 5c50c9b | 2013-03-22 18:12:51 +0000 | [diff] [blame] | 828 | error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); |
| 829 | if (error == -EINTR) |
| 830 | return error; |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 831 | |
| 832 | dentry = lookup_one_len(name, parent->dentry, namelen); |
| 833 | error = PTR_ERR(dentry); |
| 834 | if (IS_ERR(dentry)) |
| 835 | goto out_unlock; |
| 836 | |
| 837 | error = -EEXIST; |
| 838 | if (dentry->d_inode) |
| 839 | goto out_dput; |
| 840 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 841 | error = btrfs_may_create(dir, dentry); |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 842 | if (error) |
Liu Bo | a874a63 | 2012-06-29 03:58:46 -0600 | [diff] [blame] | 843 | goto out_dput; |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 844 | |
Chris Mason | 9c52057 | 2012-12-17 14:26:57 -0500 | [diff] [blame] | 845 | /* |
| 846 | * even if this name doesn't exist, we may get hash collisions. |
| 847 | * check for them now when we can safely fail |
| 848 | */ |
| 849 | error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, |
| 850 | dir->i_ino, name, |
| 851 | namelen); |
| 852 | if (error) |
| 853 | goto out_dput; |
| 854 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 855 | down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); |
| 856 | |
| 857 | if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) |
| 858 | goto out_up_read; |
| 859 | |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 860 | if (snap_src) { |
Miao Xie | e9662f7 | 2013-02-28 10:01:15 +0000 | [diff] [blame] | 861 | error = create_snapshot(snap_src, dir, dentry, name, namelen, |
Arne Jansen | 6f72c7e | 2011-09-14 15:58:21 +0200 | [diff] [blame] | 862 | async_transid, readonly, inherit); |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 863 | } else { |
Miao Xie | d5c1207 | 2013-02-28 10:04:33 +0000 | [diff] [blame] | 864 | error = create_subvol(dir, dentry, name, namelen, |
| 865 | async_transid, inherit); |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 866 | } |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 867 | if (!error) |
| 868 | fsnotify_mkdir(dir, dentry); |
| 869 | out_up_read: |
| 870 | up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 871 | out_dput: |
| 872 | dput(dentry); |
| 873 | out_unlock: |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 874 | mutex_unlock(&dir->i_mutex); |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 875 | return error; |
| 876 | } |
| 877 | |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 878 | /* |
| 879 | * When we're defragging a range, we don't want to kick it off again |
| 880 | * if it is really just waiting for delalloc to send it down. |
| 881 | * If we find a nice big extent or delalloc range for the bytes in the |
| 882 | * file you want to defrag, we return 0 to let you know to skip this |
| 883 | * part of the file |
| 884 | */ |
| 885 | static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh) |
| 886 | { |
| 887 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
| 888 | struct extent_map *em = NULL; |
| 889 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
| 890 | u64 end; |
| 891 | |
| 892 | read_lock(&em_tree->lock); |
| 893 | em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); |
| 894 | read_unlock(&em_tree->lock); |
| 895 | |
| 896 | if (em) { |
| 897 | end = extent_map_end(em); |
| 898 | free_extent_map(em); |
| 899 | if (end - offset > thresh) |
| 900 | return 0; |
| 901 | } |
| 902 | /* if we already have a nice delalloc here, just stop */ |
| 903 | thresh /= 2; |
| 904 | end = count_range_bits(io_tree, &offset, offset + thresh, |
| 905 | thresh, EXTENT_DELALLOC, 1); |
| 906 | if (end >= thresh) |
| 907 | return 0; |
| 908 | return 1; |
| 909 | } |
| 910 | |
| 911 | /* |
| 912 | * helper function to walk through a file and find extents |
| 913 | * newer than a specific transid, and smaller than thresh. |
| 914 | * |
| 915 | * This is used by the defragging code to find new and small |
| 916 | * extents |
| 917 | */ |
| 918 | static int find_new_extents(struct btrfs_root *root, |
| 919 | struct inode *inode, u64 newer_than, |
| 920 | u64 *off, int thresh) |
| 921 | { |
| 922 | struct btrfs_path *path; |
| 923 | struct btrfs_key min_key; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 924 | struct extent_buffer *leaf; |
| 925 | struct btrfs_file_extent_item *extent; |
| 926 | int type; |
| 927 | int ret; |
David Sterba | a4689d2 | 2011-05-31 17:08:14 +0000 | [diff] [blame] | 928 | u64 ino = btrfs_ino(inode); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 929 | |
| 930 | path = btrfs_alloc_path(); |
| 931 | if (!path) |
| 932 | return -ENOMEM; |
| 933 | |
David Sterba | a4689d2 | 2011-05-31 17:08:14 +0000 | [diff] [blame] | 934 | min_key.objectid = ino; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 935 | min_key.type = BTRFS_EXTENT_DATA_KEY; |
| 936 | min_key.offset = *off; |
| 937 | |
Dulshani Gunawardhana | 6787125 | 2013-10-31 10:33:04 +0530 | [diff] [blame] | 938 | while (1) { |
Filipe Manana | f094c9bd | 2014-03-12 01:28:24 +0000 | [diff] [blame] | 939 | path->keep_locks = 1; |
Filipe David Borba Manana | 6174d3c | 2013-10-01 16:13:42 +0100 | [diff] [blame] | 940 | ret = btrfs_search_forward(root, &min_key, path, newer_than); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 941 | if (ret != 0) |
| 942 | goto none; |
Filipe Manana | f094c9bd | 2014-03-12 01:28:24 +0000 | [diff] [blame] | 943 | path->keep_locks = 0; |
| 944 | btrfs_unlock_up_safe(path, 1); |
| 945 | process_slot: |
David Sterba | a4689d2 | 2011-05-31 17:08:14 +0000 | [diff] [blame] | 946 | if (min_key.objectid != ino) |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 947 | goto none; |
| 948 | if (min_key.type != BTRFS_EXTENT_DATA_KEY) |
| 949 | goto none; |
| 950 | |
| 951 | leaf = path->nodes[0]; |
| 952 | extent = btrfs_item_ptr(leaf, path->slots[0], |
| 953 | struct btrfs_file_extent_item); |
| 954 | |
| 955 | type = btrfs_file_extent_type(leaf, extent); |
| 956 | if (type == BTRFS_FILE_EXTENT_REG && |
| 957 | btrfs_file_extent_num_bytes(leaf, extent) < thresh && |
| 958 | check_defrag_in_cache(inode, min_key.offset, thresh)) { |
| 959 | *off = min_key.offset; |
| 960 | btrfs_free_path(path); |
| 961 | return 0; |
| 962 | } |
| 963 | |
Filipe Manana | f094c9bd | 2014-03-12 01:28:24 +0000 | [diff] [blame] | 964 | path->slots[0]++; |
| 965 | if (path->slots[0] < btrfs_header_nritems(leaf)) { |
| 966 | btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]); |
| 967 | goto process_slot; |
| 968 | } |
| 969 | |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 970 | if (min_key.offset == (u64)-1) |
| 971 | goto none; |
| 972 | |
| 973 | min_key.offset++; |
| 974 | btrfs_release_path(path); |
| 975 | } |
| 976 | none: |
| 977 | btrfs_free_path(path); |
| 978 | return -ENOENT; |
| 979 | } |
| 980 | |
Li Zefan | 6c282eb | 2012-06-11 16:03:35 +0800 | [diff] [blame] | 981 | static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) |
Liu Bo | 17ce6ef | 2012-03-29 09:57:45 -0400 | [diff] [blame] | 982 | { |
| 983 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 984 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
Li Zefan | 6c282eb | 2012-06-11 16:03:35 +0800 | [diff] [blame] | 985 | struct extent_map *em; |
| 986 | u64 len = PAGE_CACHE_SIZE; |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 987 | |
| 988 | /* |
| 989 | * hopefully we have this extent in the tree already, try without |
| 990 | * the full extent lock |
| 991 | */ |
| 992 | read_lock(&em_tree->lock); |
| 993 | em = lookup_extent_mapping(em_tree, start, len); |
| 994 | read_unlock(&em_tree->lock); |
| 995 | |
| 996 | if (!em) { |
Filipe Manana | 308d980 | 2014-03-11 13:56:15 +0000 | [diff] [blame] | 997 | struct extent_state *cached = NULL; |
| 998 | u64 end = start + len - 1; |
| 999 | |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 1000 | /* get the big lock and read metadata off disk */ |
Filipe Manana | 308d980 | 2014-03-11 13:56:15 +0000 | [diff] [blame] | 1001 | lock_extent_bits(io_tree, start, end, 0, &cached); |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 1002 | em = btrfs_get_extent(inode, NULL, 0, start, len, 0); |
Filipe Manana | 308d980 | 2014-03-11 13:56:15 +0000 | [diff] [blame] | 1003 | unlock_extent_cached(io_tree, start, end, &cached, GFP_NOFS); |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 1004 | |
Dan Carpenter | 6cf8bfb | 2010-03-20 11:22:10 +0000 | [diff] [blame] | 1005 | if (IS_ERR(em)) |
Li Zefan | 6c282eb | 2012-06-11 16:03:35 +0800 | [diff] [blame] | 1006 | return NULL; |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 1007 | } |
| 1008 | |
Li Zefan | 6c282eb | 2012-06-11 16:03:35 +0800 | [diff] [blame] | 1009 | return em; |
| 1010 | } |
| 1011 | |
| 1012 | static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) |
| 1013 | { |
| 1014 | struct extent_map *next; |
| 1015 | bool ret = true; |
| 1016 | |
| 1017 | /* this is the last extent */ |
| 1018 | if (em->start + em->len >= i_size_read(inode)) |
| 1019 | return false; |
| 1020 | |
| 1021 | next = defrag_lookup_extent(inode, em->start + em->len); |
Filipe Manana | e2127cf | 2014-03-01 10:57:03 +0000 | [diff] [blame] | 1022 | if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE || |
| 1023 | (em->block_start + em->block_len == next->block_start)) |
Li Zefan | 6c282eb | 2012-06-11 16:03:35 +0800 | [diff] [blame] | 1024 | ret = false; |
| 1025 | |
| 1026 | free_extent_map(next); |
| 1027 | return ret; |
| 1028 | } |
| 1029 | |
| 1030 | static int should_defrag_range(struct inode *inode, u64 start, int thresh, |
Andrew Mahone | a43a211 | 2012-06-19 21:08:32 -0400 | [diff] [blame] | 1031 | u64 *last_len, u64 *skip, u64 *defrag_end, |
| 1032 | int compress) |
Li Zefan | 6c282eb | 2012-06-11 16:03:35 +0800 | [diff] [blame] | 1033 | { |
| 1034 | struct extent_map *em; |
| 1035 | int ret = 1; |
| 1036 | bool next_mergeable = true; |
| 1037 | |
| 1038 | /* |
| 1039 | * make sure that once we start defragging an extent, we keep on |
| 1040 | * defragging it |
| 1041 | */ |
| 1042 | if (start < *defrag_end) |
| 1043 | return 1; |
| 1044 | |
| 1045 | *skip = 0; |
| 1046 | |
| 1047 | em = defrag_lookup_extent(inode, start); |
| 1048 | if (!em) |
| 1049 | return 0; |
| 1050 | |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 1051 | /* this will cover holes, and inline extents */ |
Liu Bo | 17ce6ef | 2012-03-29 09:57:45 -0400 | [diff] [blame] | 1052 | if (em->block_start >= EXTENT_MAP_LAST_BYTE) { |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 1053 | ret = 0; |
Liu Bo | 17ce6ef | 2012-03-29 09:57:45 -0400 | [diff] [blame] | 1054 | goto out; |
| 1055 | } |
| 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 | |
| 1059 | /* |
Li Zefan | 6c282eb | 2012-06-11 16:03:35 +0800 | [diff] [blame] | 1060 | * we hit a real extent, if it is big or the next extent is not a |
| 1061 | * real extent, don't bother defragging it |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 1062 | */ |
Andrew Mahone | a43a211 | 2012-06-19 21:08:32 -0400 | [diff] [blame] | 1063 | if (!compress && (*last_len == 0 || *last_len >= thresh) && |
Li Zefan | 6c282eb | 2012-06-11 16:03:35 +0800 | [diff] [blame] | 1064 | (em->len >= thresh || !next_mergeable)) |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 1065 | ret = 0; |
Liu Bo | 17ce6ef | 2012-03-29 09:57:45 -0400 | [diff] [blame] | 1066 | out: |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 1067 | /* |
| 1068 | * last_len ends up being a counter of how many bytes we've defragged. |
| 1069 | * every time we choose not to defrag an extent, we reset *last_len |
| 1070 | * so that the next tiny extent will force a defrag. |
| 1071 | * |
| 1072 | * The end result of this is that tiny extents before a single big |
| 1073 | * extent will force at least part of that big extent to be defragged. |
| 1074 | */ |
| 1075 | if (ret) { |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 1076 | *defrag_end = extent_map_end(em); |
| 1077 | } else { |
| 1078 | *last_len = 0; |
| 1079 | *skip = extent_map_end(em); |
| 1080 | *defrag_end = 0; |
| 1081 | } |
| 1082 | |
| 1083 | free_extent_map(em); |
| 1084 | return ret; |
| 1085 | } |
| 1086 | |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1087 | /* |
| 1088 | * it doesn't do much good to defrag one or two pages |
| 1089 | * at a time. This pulls in a nice chunk of pages |
| 1090 | * to COW and defrag. |
| 1091 | * |
| 1092 | * It also makes sure the delalloc code has enough |
| 1093 | * dirty data to avoid making new small extents as part |
| 1094 | * of the defrag |
| 1095 | * |
| 1096 | * It's a good idea to start RA on this range |
| 1097 | * before calling this. |
| 1098 | */ |
| 1099 | static int cluster_pages_for_defrag(struct inode *inode, |
| 1100 | struct page **pages, |
| 1101 | unsigned long start_index, |
Justin Maggard | c41570c | 2014-01-21 11:18:29 -0800 | [diff] [blame] | 1102 | unsigned long num_pages) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1103 | { |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1104 | unsigned long file_end; |
| 1105 | u64 isize = i_size_read(inode); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1106 | u64 page_start; |
| 1107 | u64 page_end; |
Liu Bo | 1f12bd0 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 1108 | u64 page_cnt; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1109 | int ret; |
| 1110 | int i; |
| 1111 | int i_done; |
| 1112 | struct btrfs_ordered_extent *ordered; |
| 1113 | struct extent_state *cached_state = NULL; |
Miao Xie | 600a45e | 2012-02-16 15:01:24 +0800 | [diff] [blame] | 1114 | struct extent_io_tree *tree; |
Josef Bacik | 3b16a4e | 2011-09-21 15:05:58 -0400 | [diff] [blame] | 1115 | gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1116 | |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1117 | file_end = (isize - 1) >> PAGE_CACHE_SHIFT; |
Liu Bo | 1f12bd0 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 1118 | if (!isize || start_index > file_end) |
| 1119 | return 0; |
| 1120 | |
| 1121 | 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] | 1122 | |
| 1123 | ret = btrfs_delalloc_reserve_space(inode, |
Liu Bo | 1f12bd0 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 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, |
Liu Bo | 1f12bd0 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 1214 | (page_cnt - i_done) << PAGE_CACHE_SHIFT); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1215 | } |
| 1216 | |
| 1217 | |
Liu Bo | 9e8a4a8 | 2012-09-05 19:10:51 -0600 | [diff] [blame] | 1218 | set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, |
| 1219 | &cached_state, GFP_NOFS); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1220 | |
| 1221 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, |
| 1222 | page_start, page_end - 1, &cached_state, |
| 1223 | GFP_NOFS); |
| 1224 | |
| 1225 | for (i = 0; i < i_done; i++) { |
| 1226 | clear_page_dirty_for_io(pages[i]); |
| 1227 | ClearPageChecked(pages[i]); |
| 1228 | set_page_extent_mapped(pages[i]); |
| 1229 | set_page_dirty(pages[i]); |
| 1230 | unlock_page(pages[i]); |
| 1231 | page_cache_release(pages[i]); |
| 1232 | } |
| 1233 | return i_done; |
| 1234 | out: |
| 1235 | for (i = 0; i < i_done; i++) { |
| 1236 | unlock_page(pages[i]); |
| 1237 | page_cache_release(pages[i]); |
| 1238 | } |
Liu Bo | 1f12bd0 | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 1239 | btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1240 | return ret; |
| 1241 | |
| 1242 | } |
| 1243 | |
| 1244 | int btrfs_defrag_file(struct inode *inode, struct file *file, |
| 1245 | struct btrfs_ioctl_defrag_range_args *range, |
| 1246 | u64 newer_than, unsigned long max_to_defrag) |
| 1247 | { |
| 1248 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1249 | struct file_ra_state *ra = NULL; |
| 1250 | unsigned long last_index; |
Li Zefan | 151a31b | 2011-09-02 15:56:39 +0800 | [diff] [blame] | 1251 | u64 isize = i_size_read(inode); |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 1252 | u64 last_len = 0; |
| 1253 | u64 skip = 0; |
| 1254 | u64 defrag_end = 0; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1255 | u64 newer_off = range->start; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1256 | unsigned long i; |
Li Zefan | 008873e | 2011-09-02 15:57:07 +0800 | [diff] [blame] | 1257 | unsigned long ra_index = 0; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1258 | int ret; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1259 | int defrag_count = 0; |
Li Zefan | 1a419d8 | 2010-10-25 15:12:50 +0800 | [diff] [blame] | 1260 | int compress_type = BTRFS_COMPRESS_ZLIB; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1261 | int extent_thresh = range->extent_thresh; |
Justin Maggard | c41570c | 2014-01-21 11:18:29 -0800 | [diff] [blame] | 1262 | unsigned long max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT; |
| 1263 | unsigned long cluster = max_cluster; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1264 | u64 new_align = ~((u64)128 * 1024 - 1); |
| 1265 | struct page **pages = NULL; |
| 1266 | |
Liu Bo | 0abd5b1 | 2013-04-16 09:20:28 +0000 | [diff] [blame] | 1267 | if (isize == 0) |
| 1268 | return 0; |
| 1269 | |
| 1270 | if (range->start >= isize) |
| 1271 | return -EINVAL; |
Li Zefan | 1a419d8 | 2010-10-25 15:12:50 +0800 | [diff] [blame] | 1272 | |
| 1273 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { |
| 1274 | if (range->compress_type > BTRFS_COMPRESS_TYPES) |
| 1275 | return -EINVAL; |
| 1276 | if (range->compress_type) |
| 1277 | compress_type = range->compress_type; |
| 1278 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1279 | |
Liu Bo | 0abd5b1 | 2013-04-16 09:20:28 +0000 | [diff] [blame] | 1280 | if (extent_thresh == 0) |
| 1281 | extent_thresh = 256 * 1024; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1282 | |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1283 | /* |
| 1284 | * if we were not given a file, allocate a readahead |
| 1285 | * context |
| 1286 | */ |
| 1287 | if (!file) { |
| 1288 | ra = kzalloc(sizeof(*ra), GFP_NOFS); |
| 1289 | if (!ra) |
| 1290 | return -ENOMEM; |
| 1291 | file_ra_state_init(ra, inode->i_mapping); |
| 1292 | } else { |
| 1293 | ra = &file->f_ra; |
| 1294 | } |
| 1295 | |
Dulshani Gunawardhana | d9b0d9b | 2013-10-31 10:32:18 +0530 | [diff] [blame] | 1296 | pages = kmalloc_array(max_cluster, sizeof(struct page *), |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1297 | GFP_NOFS); |
| 1298 | if (!pages) { |
| 1299 | ret = -ENOMEM; |
| 1300 | goto out_ra; |
| 1301 | } |
| 1302 | |
| 1303 | /* find the last page to defrag */ |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 1304 | if (range->start + range->len > range->start) { |
Li Zefan | 151a31b | 2011-09-02 15:56:39 +0800 | [diff] [blame] | 1305 | last_index = min_t(u64, isize - 1, |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 1306 | range->start + range->len - 1) >> PAGE_CACHE_SHIFT; |
| 1307 | } else { |
Li Zefan | 151a31b | 2011-09-02 15:56:39 +0800 | [diff] [blame] | 1308 | last_index = (isize - 1) >> PAGE_CACHE_SHIFT; |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 1309 | } |
| 1310 | |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1311 | if (newer_than) { |
| 1312 | ret = find_new_extents(root, inode, newer_than, |
| 1313 | &newer_off, 64 * 1024); |
| 1314 | if (!ret) { |
| 1315 | range->start = newer_off; |
| 1316 | /* |
| 1317 | * we always align our defrag to help keep |
| 1318 | * the extents in the file evenly spaced |
| 1319 | */ |
| 1320 | i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1321 | } else |
| 1322 | goto out_ra; |
| 1323 | } else { |
| 1324 | i = range->start >> PAGE_CACHE_SHIFT; |
| 1325 | } |
| 1326 | if (!max_to_defrag) |
Liu Bo | 7ec31b5 | 2012-01-26 15:01:12 -0500 | [diff] [blame] | 1327 | max_to_defrag = last_index + 1; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1328 | |
Li Zefan | 2a0f7f5 | 2011-10-10 15:43:34 -0400 | [diff] [blame] | 1329 | /* |
| 1330 | * make writeback starts from i, so the defrag range can be |
| 1331 | * written sequentially. |
| 1332 | */ |
| 1333 | if (i < inode->i_mapping->writeback_index) |
| 1334 | inode->i_mapping->writeback_index = i; |
| 1335 | |
Chris Mason | f7f43cc | 2011-10-11 11:41:40 -0400 | [diff] [blame] | 1336 | while (i <= last_index && defrag_count < max_to_defrag && |
| 1337 | (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> |
| 1338 | PAGE_CACHE_SHIFT)) { |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1339 | /* |
| 1340 | * make sure we stop running if someone unmounts |
| 1341 | * the FS |
| 1342 | */ |
| 1343 | if (!(inode->i_sb->s_flags & MS_ACTIVE)) |
| 1344 | break; |
| 1345 | |
David Sterba | 210549e | 2013-02-09 23:38:06 +0000 | [diff] [blame] | 1346 | if (btrfs_defrag_cancelled(root->fs_info)) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 1347 | printk(KERN_DEBUG "BTRFS: defrag_file cancelled\n"); |
David Sterba | 210549e | 2013-02-09 23:38:06 +0000 | [diff] [blame] | 1348 | ret = -EAGAIN; |
| 1349 | break; |
| 1350 | } |
| 1351 | |
Liu Bo | 66c2689 | 2012-03-29 09:57:45 -0400 | [diff] [blame] | 1352 | if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, |
Li Zefan | 6c282eb | 2012-06-11 16:03:35 +0800 | [diff] [blame] | 1353 | extent_thresh, &last_len, &skip, |
Andrew Mahone | a43a211 | 2012-06-19 21:08:32 -0400 | [diff] [blame] | 1354 | &defrag_end, range->flags & |
| 1355 | BTRFS_DEFRAG_RANGE_COMPRESS)) { |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 1356 | unsigned long next; |
| 1357 | /* |
| 1358 | * the should_defrag function tells us how much to skip |
| 1359 | * bump our counter by the suggested amount |
| 1360 | */ |
| 1361 | next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; |
| 1362 | i = max(i + 1, next); |
| 1363 | continue; |
| 1364 | } |
Li Zefan | 008873e | 2011-09-02 15:57:07 +0800 | [diff] [blame] | 1365 | |
| 1366 | if (!newer_than) { |
| 1367 | cluster = (PAGE_CACHE_ALIGN(defrag_end) >> |
| 1368 | PAGE_CACHE_SHIFT) - i; |
| 1369 | cluster = min(cluster, max_cluster); |
| 1370 | } else { |
| 1371 | cluster = max_cluster; |
| 1372 | } |
| 1373 | |
Li Zefan | 008873e | 2011-09-02 15:57:07 +0800 | [diff] [blame] | 1374 | if (i + cluster > ra_index) { |
| 1375 | ra_index = max(i, ra_index); |
| 1376 | btrfs_force_ra(inode->i_mapping, ra, file, ra_index, |
| 1377 | cluster); |
| 1378 | ra_index += max_cluster; |
| 1379 | } |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 1380 | |
Liu Bo | ecb8bea | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 1381 | mutex_lock(&inode->i_mutex); |
Filipe David Borba Manana | 633085c | 2013-08-16 15:23:33 +0100 | [diff] [blame] | 1382 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) |
| 1383 | BTRFS_I(inode)->force_compress = compress_type; |
Li Zefan | 008873e | 2011-09-02 15:57:07 +0800 | [diff] [blame] | 1384 | ret = cluster_pages_for_defrag(inode, pages, i, cluster); |
Liu Bo | ecb8bea | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 1385 | if (ret < 0) { |
| 1386 | mutex_unlock(&inode->i_mutex); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1387 | goto out_ra; |
Liu Bo | ecb8bea | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 1388 | } |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 1389 | |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1390 | defrag_count += ret; |
Namjae Jeon | d0e1d66 | 2012-12-11 16:00:21 -0800 | [diff] [blame] | 1391 | balance_dirty_pages_ratelimited(inode->i_mapping); |
Liu Bo | ecb8bea | 2012-03-29 09:57:44 -0400 | [diff] [blame] | 1392 | mutex_unlock(&inode->i_mutex); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1393 | |
| 1394 | if (newer_than) { |
| 1395 | if (newer_off == (u64)-1) |
| 1396 | break; |
| 1397 | |
Liu Bo | e1f041e1 | 2012-03-29 09:57:45 -0400 | [diff] [blame] | 1398 | if (ret > 0) |
| 1399 | i += ret; |
| 1400 | |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1401 | newer_off = max(newer_off + 1, |
| 1402 | (u64)i << PAGE_CACHE_SHIFT); |
| 1403 | |
| 1404 | ret = find_new_extents(root, inode, |
| 1405 | newer_than, &newer_off, |
| 1406 | 64 * 1024); |
| 1407 | if (!ret) { |
| 1408 | range->start = newer_off; |
| 1409 | i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1410 | } else { |
| 1411 | break; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1412 | } |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1413 | } else { |
Li Zefan | 008873e | 2011-09-02 15:57:07 +0800 | [diff] [blame] | 1414 | if (ret > 0) { |
Li Zefan | cbcc832 | 2011-09-02 15:56:25 +0800 | [diff] [blame] | 1415 | i += ret; |
Li Zefan | 008873e | 2011-09-02 15:57:07 +0800 | [diff] [blame] | 1416 | last_len += ret << PAGE_CACHE_SHIFT; |
| 1417 | } else { |
Li Zefan | cbcc832 | 2011-09-02 15:56:25 +0800 | [diff] [blame] | 1418 | i++; |
Li Zefan | 008873e | 2011-09-02 15:57:07 +0800 | [diff] [blame] | 1419 | last_len = 0; |
| 1420 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1421 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1422 | } |
| 1423 | |
Filipe Manana | dec8ef9 | 2014-03-01 10:55:54 +0000 | [diff] [blame] | 1424 | if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) { |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 1425 | filemap_flush(inode->i_mapping); |
Filipe Manana | dec8ef9 | 2014-03-01 10:55:54 +0000 | [diff] [blame] | 1426 | if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, |
| 1427 | &BTRFS_I(inode)->runtime_flags)) |
| 1428 | filemap_flush(inode->i_mapping); |
| 1429 | } |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 1430 | |
| 1431 | if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { |
| 1432 | /* the filemap_flush will queue IO into the worker threads, but |
| 1433 | * we have to make sure the IO is actually started and that |
| 1434 | * ordered extents get created before we return |
| 1435 | */ |
| 1436 | atomic_inc(&root->fs_info->async_submit_draining); |
| 1437 | while (atomic_read(&root->fs_info->nr_async_submits) || |
| 1438 | atomic_read(&root->fs_info->async_delalloc_pages)) { |
| 1439 | wait_event(root->fs_info->async_submit_wait, |
| 1440 | (atomic_read(&root->fs_info->nr_async_submits) == 0 && |
| 1441 | atomic_read(&root->fs_info->async_delalloc_pages) == 0)); |
| 1442 | } |
| 1443 | atomic_dec(&root->fs_info->async_submit_draining); |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 1444 | } |
| 1445 | |
Li Zefan | 1a419d8 | 2010-10-25 15:12:50 +0800 | [diff] [blame] | 1446 | if (range->compress_type == BTRFS_COMPRESS_LZO) { |
Mitch Harder | 2b0ce2c | 2012-07-24 11:58:43 -0600 | [diff] [blame] | 1447 | btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO); |
Li Zefan | 1a419d8 | 2010-10-25 15:12:50 +0800 | [diff] [blame] | 1448 | } |
| 1449 | |
Diego Calleja | 60ccf82 | 2011-09-01 16:33:57 +0200 | [diff] [blame] | 1450 | ret = defrag_count; |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 1451 | |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1452 | out_ra: |
Filipe David Borba Manana | 633085c | 2013-08-16 15:23:33 +0100 | [diff] [blame] | 1453 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { |
| 1454 | mutex_lock(&inode->i_mutex); |
| 1455 | BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; |
| 1456 | mutex_unlock(&inode->i_mutex); |
| 1457 | } |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 1458 | if (!file) |
| 1459 | kfree(ra); |
| 1460 | kfree(pages); |
Chris Mason | 940100a | 2010-03-10 10:52:59 -0500 | [diff] [blame] | 1461 | return ret; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1462 | } |
| 1463 | |
Miao Xie | 198605a | 2012-11-26 08:43:45 +0000 | [diff] [blame] | 1464 | static noinline int btrfs_ioctl_resize(struct file *file, |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 1465 | void __user *arg) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1466 | { |
| 1467 | u64 new_size; |
| 1468 | u64 old_size; |
| 1469 | u64 devid = 1; |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1470 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1471 | struct btrfs_ioctl_vol_args *vol_args; |
| 1472 | struct btrfs_trans_handle *trans; |
| 1473 | struct btrfs_device *device = NULL; |
| 1474 | char *sizestr; |
Gui Hecheng | 9a40f12 | 2014-03-31 18:03:25 +0800 | [diff] [blame] | 1475 | char *retptr; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1476 | char *devstr = NULL; |
| 1477 | int ret = 0; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1478 | int mod = 0; |
| 1479 | |
Chris Mason | e441d54 | 2009-01-05 16:57:23 -0500 | [diff] [blame] | 1480 | if (!capable(CAP_SYS_ADMIN)) |
| 1481 | return -EPERM; |
| 1482 | |
Miao Xie | 198605a | 2012-11-26 08:43:45 +0000 | [diff] [blame] | 1483 | ret = mnt_want_write_file(file); |
| 1484 | if (ret) |
| 1485 | return ret; |
| 1486 | |
Stefan Behrens | 5ac00ad | 2012-11-05 17:54:08 +0100 | [diff] [blame] | 1487 | if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, |
| 1488 | 1)) { |
Miao Xie | 9754767 | 2012-12-21 10:38:50 +0000 | [diff] [blame] | 1489 | mnt_drop_write_file(file); |
Anand Jain | e57138b | 2013-08-21 11:44:48 +0800 | [diff] [blame] | 1490 | return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 1491 | } |
| 1492 | |
Stefan Behrens | 5ac00ad | 2012-11-05 17:54:08 +0100 | [diff] [blame] | 1493 | mutex_lock(&root->fs_info->volume_mutex); |
Li Zefan | dae7b66 | 2009-04-08 15:06:54 +0800 | [diff] [blame] | 1494 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 1495 | if (IS_ERR(vol_args)) { |
| 1496 | ret = PTR_ERR(vol_args); |
| 1497 | goto out; |
| 1498 | } |
Mark Fasheh | 5516e59 | 2008-07-24 12:20:14 -0400 | [diff] [blame] | 1499 | |
| 1500 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1501 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1502 | sizestr = vol_args->name; |
| 1503 | devstr = strchr(sizestr, ':'); |
| 1504 | if (devstr) { |
| 1505 | char *end; |
| 1506 | sizestr = devstr + 1; |
| 1507 | *devstr = '\0'; |
| 1508 | devstr = vol_args->name; |
| 1509 | devid = simple_strtoull(devstr, &end, 10); |
Miao Xie | dfd7982 | 2012-12-21 09:21:30 +0000 | [diff] [blame] | 1510 | if (!devid) { |
| 1511 | ret = -EINVAL; |
| 1512 | goto out_free; |
| 1513 | } |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 1514 | btrfs_info(root->fs_info, "resizing devid %llu", devid); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1515 | } |
Miao Xie | dba60f3 | 2012-12-21 09:19:51 +0000 | [diff] [blame] | 1516 | |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 1517 | device = btrfs_find_device(root->fs_info, devid, NULL, NULL); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1518 | if (!device) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 1519 | btrfs_info(root->fs_info, "resizer unable to find device %llu", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 1520 | devid); |
Miao Xie | dfd7982 | 2012-12-21 09:21:30 +0000 | [diff] [blame] | 1521 | ret = -ENODEV; |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 1522 | goto out_free; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1523 | } |
Miao Xie | dba60f3 | 2012-12-21 09:19:51 +0000 | [diff] [blame] | 1524 | |
| 1525 | if (!device->writeable) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 1526 | btrfs_info(root->fs_info, |
| 1527 | "resizer unable to apply on readonly device %llu", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 1528 | devid); |
Miao Xie | dfd7982 | 2012-12-21 09:21:30 +0000 | [diff] [blame] | 1529 | ret = -EPERM; |
Liu Bo | 4e42ae1 | 2012-06-14 02:23:19 -0600 | [diff] [blame] | 1530 | goto out_free; |
| 1531 | } |
| 1532 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1533 | if (!strcmp(sizestr, "max")) |
| 1534 | new_size = device->bdev->bd_inode->i_size; |
| 1535 | else { |
| 1536 | if (sizestr[0] == '-') { |
| 1537 | mod = -1; |
| 1538 | sizestr++; |
| 1539 | } else if (sizestr[0] == '+') { |
| 1540 | mod = 1; |
| 1541 | sizestr++; |
| 1542 | } |
Gui Hecheng | 9a40f12 | 2014-03-31 18:03:25 +0800 | [diff] [blame] | 1543 | new_size = memparse(sizestr, &retptr); |
| 1544 | if (*retptr != '\0' || new_size == 0) { |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1545 | ret = -EINVAL; |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 1546 | goto out_free; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1547 | } |
| 1548 | } |
| 1549 | |
Stefan Behrens | 63a212a | 2012-11-05 18:29:28 +0100 | [diff] [blame] | 1550 | if (device->is_tgtdev_for_dev_replace) { |
Miao Xie | dfd7982 | 2012-12-21 09:21:30 +0000 | [diff] [blame] | 1551 | ret = -EPERM; |
Stefan Behrens | 63a212a | 2012-11-05 18:29:28 +0100 | [diff] [blame] | 1552 | goto out_free; |
| 1553 | } |
| 1554 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1555 | old_size = device->total_bytes; |
| 1556 | |
| 1557 | if (mod < 0) { |
| 1558 | if (new_size > old_size) { |
| 1559 | ret = -EINVAL; |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 1560 | goto out_free; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1561 | } |
| 1562 | new_size = old_size - new_size; |
| 1563 | } else if (mod > 0) { |
Wenliang Fan | eb8052e | 2013-12-20 15:28:56 +0800 | [diff] [blame] | 1564 | if (new_size > ULLONG_MAX - old_size) { |
| 1565 | ret = -EINVAL; |
| 1566 | goto out_free; |
| 1567 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1568 | new_size = old_size + new_size; |
| 1569 | } |
| 1570 | |
| 1571 | if (new_size < 256 * 1024 * 1024) { |
| 1572 | ret = -EINVAL; |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 1573 | goto out_free; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1574 | } |
| 1575 | if (new_size > device->bdev->bd_inode->i_size) { |
| 1576 | ret = -EFBIG; |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 1577 | goto out_free; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1578 | } |
| 1579 | |
| 1580 | do_div(new_size, root->sectorsize); |
| 1581 | new_size *= root->sectorsize; |
| 1582 | |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 1583 | printk_in_rcu(KERN_INFO "BTRFS: new size for %s is %llu\n", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 1584 | rcu_str_deref(device->name), new_size); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1585 | |
| 1586 | if (new_size > old_size) { |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 1587 | trans = btrfs_start_transaction(root, 0); |
Tsutomu Itoh | 98d5dc1 | 2011-01-20 06:19:37 +0000 | [diff] [blame] | 1588 | if (IS_ERR(trans)) { |
| 1589 | ret = PTR_ERR(trans); |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 1590 | goto out_free; |
Tsutomu Itoh | 98d5dc1 | 2011-01-20 06:19:37 +0000 | [diff] [blame] | 1591 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1592 | ret = btrfs_grow_device(trans, device, new_size); |
| 1593 | btrfs_commit_transaction(trans, root); |
Mike Fleetwood | ece7d20 | 2011-11-18 18:55:01 +0000 | [diff] [blame] | 1594 | } else if (new_size < old_size) { |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1595 | ret = btrfs_shrink_device(device, new_size); |
jeff.liu | 0253f40 | 2012-10-27 12:06:39 +0000 | [diff] [blame] | 1596 | } /* equal, nothing need to do */ |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1597 | |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 1598 | out_free: |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1599 | kfree(vol_args); |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 1600 | out: |
| 1601 | mutex_unlock(&root->fs_info->volume_mutex); |
Stefan Behrens | 5ac00ad | 2012-11-05 17:54:08 +0100 | [diff] [blame] | 1602 | atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); |
Ilya Dryomov | 18f39c4 | 2013-01-20 15:57:57 +0200 | [diff] [blame] | 1603 | mnt_drop_write_file(file); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1604 | return ret; |
| 1605 | } |
| 1606 | |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 1607 | static noinline int btrfs_ioctl_snap_create_transid(struct file *file, |
Arne Jansen | 6f72c7e | 2011-09-14 15:58:21 +0200 | [diff] [blame] | 1608 | char *name, unsigned long fd, int subvol, |
| 1609 | u64 *transid, bool readonly, |
Miao Xie | 8696c53 | 2013-02-07 06:02:44 +0000 | [diff] [blame] | 1610 | struct btrfs_qgroup_inherit *inherit) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1611 | { |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1612 | int namelen; |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1613 | int ret = 0; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1614 | |
Liu Bo | a874a63 | 2012-06-29 03:58:46 -0600 | [diff] [blame] | 1615 | ret = mnt_want_write_file(file); |
| 1616 | if (ret) |
| 1617 | goto out; |
| 1618 | |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 1619 | namelen = strlen(name); |
| 1620 | if (strchr(name, '/')) { |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1621 | ret = -EINVAL; |
Liu Bo | a874a63 | 2012-06-29 03:58:46 -0600 | [diff] [blame] | 1622 | goto out_drop_write; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1623 | } |
| 1624 | |
Chris Mason | 16780ca | 2012-02-20 22:14:55 -0500 | [diff] [blame] | 1625 | if (name[0] == '.' && |
| 1626 | (namelen == 1 || (name[1] == '.' && namelen == 2))) { |
| 1627 | ret = -EEXIST; |
Liu Bo | a874a63 | 2012-06-29 03:58:46 -0600 | [diff] [blame] | 1628 | goto out_drop_write; |
Chris Mason | 16780ca | 2012-02-20 22:14:55 -0500 | [diff] [blame] | 1629 | } |
| 1630 | |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1631 | if (subvol) { |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 1632 | ret = btrfs_mksubvol(&file->f_path, name, namelen, |
Arne Jansen | 6f72c7e | 2011-09-14 15:58:21 +0200 | [diff] [blame] | 1633 | NULL, transid, readonly, inherit); |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 1634 | } else { |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1635 | struct fd src = fdget(fd); |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1636 | struct inode *src_inode; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1637 | if (!src.file) { |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1638 | ret = -EINVAL; |
Liu Bo | a874a63 | 2012-06-29 03:58:46 -0600 | [diff] [blame] | 1639 | goto out_drop_write; |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1640 | } |
| 1641 | |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1642 | src_inode = file_inode(src.file); |
| 1643 | if (src_inode->i_sb != file_inode(file)->i_sb) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 1644 | btrfs_info(BTRFS_I(src_inode)->root->fs_info, |
| 1645 | "Snapshot src from another FS"); |
Kusanagi Kouichi | 23ad5b1 | 2014-01-30 16:32:02 +0900 | [diff] [blame] | 1646 | ret = -EXDEV; |
David Sterba | d024206 | 2014-01-15 18:15:52 +0100 | [diff] [blame] | 1647 | } else if (!inode_owner_or_capable(src_inode)) { |
| 1648 | /* |
| 1649 | * Subvolume creation is not restricted, but snapshots |
| 1650 | * are limited to own subvolumes only |
| 1651 | */ |
| 1652 | ret = -EPERM; |
Al Viro | ecd1881 | 2012-08-26 21:20:24 -0400 | [diff] [blame] | 1653 | } else { |
| 1654 | ret = btrfs_mksubvol(&file->f_path, name, namelen, |
| 1655 | BTRFS_I(src_inode)->root, |
| 1656 | transid, readonly, inherit); |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 1657 | } |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1658 | fdput(src); |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 1659 | } |
Liu Bo | a874a63 | 2012-06-29 03:58:46 -0600 | [diff] [blame] | 1660 | out_drop_write: |
| 1661 | mnt_drop_write_file(file); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1662 | out: |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 1663 | return ret; |
| 1664 | } |
| 1665 | |
| 1666 | static noinline int btrfs_ioctl_snap_create(struct file *file, |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 1667 | void __user *arg, int subvol) |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 1668 | { |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 1669 | struct btrfs_ioctl_vol_args *vol_args; |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 1670 | int ret; |
| 1671 | |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 1672 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
| 1673 | if (IS_ERR(vol_args)) |
| 1674 | return PTR_ERR(vol_args); |
| 1675 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 1676 | |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 1677 | ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 1678 | vol_args->fd, subvol, |
Arne Jansen | 6f72c7e | 2011-09-14 15:58:21 +0200 | [diff] [blame] | 1679 | NULL, false, NULL); |
Li Zefan | fdfb1e4 | 2010-12-10 06:41:56 +0000 | [diff] [blame] | 1680 | |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 1681 | kfree(vol_args); |
| 1682 | return ret; |
| 1683 | } |
Li Zefan | fdfb1e4 | 2010-12-10 06:41:56 +0000 | [diff] [blame] | 1684 | |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 1685 | static noinline int btrfs_ioctl_snap_create_v2(struct file *file, |
| 1686 | void __user *arg, int subvol) |
| 1687 | { |
| 1688 | struct btrfs_ioctl_vol_args_v2 *vol_args; |
| 1689 | int ret; |
| 1690 | u64 transid = 0; |
| 1691 | u64 *ptr = NULL; |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 1692 | bool readonly = false; |
Arne Jansen | 6f72c7e | 2011-09-14 15:58:21 +0200 | [diff] [blame] | 1693 | struct btrfs_qgroup_inherit *inherit = NULL; |
Li Zefan | fdfb1e4 | 2010-12-10 06:41:56 +0000 | [diff] [blame] | 1694 | |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 1695 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
| 1696 | if (IS_ERR(vol_args)) |
| 1697 | return PTR_ERR(vol_args); |
| 1698 | vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; |
Sage Weil | 75eaa0e | 2010-12-10 00:36:28 +0000 | [diff] [blame] | 1699 | |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 1700 | if (vol_args->flags & |
Arne Jansen | 6f72c7e | 2011-09-14 15:58:21 +0200 | [diff] [blame] | 1701 | ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY | |
| 1702 | BTRFS_SUBVOL_QGROUP_INHERIT)) { |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 1703 | ret = -EOPNOTSUPP; |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 1704 | goto out; |
Sage Weil | 72fd032 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 1705 | } |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 1706 | |
| 1707 | if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) |
| 1708 | ptr = &transid; |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 1709 | if (vol_args->flags & BTRFS_SUBVOL_RDONLY) |
| 1710 | readonly = true; |
Arne Jansen | 6f72c7e | 2011-09-14 15:58:21 +0200 | [diff] [blame] | 1711 | if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { |
| 1712 | if (vol_args->size > PAGE_CACHE_SIZE) { |
| 1713 | ret = -EINVAL; |
| 1714 | goto out; |
| 1715 | } |
| 1716 | inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); |
| 1717 | if (IS_ERR(inherit)) { |
| 1718 | ret = PTR_ERR(inherit); |
| 1719 | goto out; |
| 1720 | } |
| 1721 | } |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 1722 | |
| 1723 | ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, |
Arne Jansen | 6f72c7e | 2011-09-14 15:58:21 +0200 | [diff] [blame] | 1724 | vol_args->fd, subvol, ptr, |
Miao Xie | 8696c53 | 2013-02-07 06:02:44 +0000 | [diff] [blame] | 1725 | readonly, inherit); |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 1726 | |
| 1727 | if (ret == 0 && ptr && |
| 1728 | copy_to_user(arg + |
| 1729 | offsetof(struct btrfs_ioctl_vol_args_v2, |
| 1730 | transid), ptr, sizeof(*ptr))) |
| 1731 | ret = -EFAULT; |
Li Zefan | fdfb1e4 | 2010-12-10 06:41:56 +0000 | [diff] [blame] | 1732 | out: |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1733 | kfree(vol_args); |
Arne Jansen | 6f72c7e | 2011-09-14 15:58:21 +0200 | [diff] [blame] | 1734 | kfree(inherit); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 1735 | return ret; |
| 1736 | } |
| 1737 | |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1738 | static noinline int btrfs_ioctl_subvol_getflags(struct file *file, |
| 1739 | void __user *arg) |
| 1740 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1741 | struct inode *inode = file_inode(file); |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1742 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 1743 | int ret = 0; |
| 1744 | u64 flags = 0; |
| 1745 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1746 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1747 | return -EINVAL; |
| 1748 | |
| 1749 | down_read(&root->fs_info->subvol_sem); |
| 1750 | if (btrfs_root_readonly(root)) |
| 1751 | flags |= BTRFS_SUBVOL_RDONLY; |
| 1752 | up_read(&root->fs_info->subvol_sem); |
| 1753 | |
| 1754 | if (copy_to_user(arg, &flags, sizeof(flags))) |
| 1755 | ret = -EFAULT; |
| 1756 | |
| 1757 | return ret; |
| 1758 | } |
| 1759 | |
| 1760 | static noinline int btrfs_ioctl_subvol_setflags(struct file *file, |
| 1761 | void __user *arg) |
| 1762 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1763 | struct inode *inode = file_inode(file); |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1764 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 1765 | struct btrfs_trans_handle *trans; |
| 1766 | u64 root_flags; |
| 1767 | u64 flags; |
| 1768 | int ret = 0; |
| 1769 | |
David Sterba | bd60ea0 | 2014-01-16 15:50:22 +0100 | [diff] [blame] | 1770 | if (!inode_owner_or_capable(inode)) |
| 1771 | return -EPERM; |
| 1772 | |
Liu Bo | b9ca066 | 2012-06-29 03:58:49 -0600 | [diff] [blame] | 1773 | ret = mnt_want_write_file(file); |
| 1774 | if (ret) |
| 1775 | goto out; |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1776 | |
Liu Bo | b9ca066 | 2012-06-29 03:58:49 -0600 | [diff] [blame] | 1777 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { |
| 1778 | ret = -EINVAL; |
| 1779 | goto out_drop_write; |
| 1780 | } |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1781 | |
Liu Bo | b9ca066 | 2012-06-29 03:58:49 -0600 | [diff] [blame] | 1782 | if (copy_from_user(&flags, arg, sizeof(flags))) { |
| 1783 | ret = -EFAULT; |
| 1784 | goto out_drop_write; |
| 1785 | } |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1786 | |
Liu Bo | b9ca066 | 2012-06-29 03:58:49 -0600 | [diff] [blame] | 1787 | if (flags & BTRFS_SUBVOL_CREATE_ASYNC) { |
| 1788 | ret = -EINVAL; |
| 1789 | goto out_drop_write; |
| 1790 | } |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1791 | |
Liu Bo | b9ca066 | 2012-06-29 03:58:49 -0600 | [diff] [blame] | 1792 | if (flags & ~BTRFS_SUBVOL_RDONLY) { |
| 1793 | ret = -EOPNOTSUPP; |
| 1794 | goto out_drop_write; |
| 1795 | } |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1796 | |
| 1797 | down_write(&root->fs_info->subvol_sem); |
| 1798 | |
| 1799 | /* nothing to do */ |
| 1800 | if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) |
Liu Bo | b9ca066 | 2012-06-29 03:58:49 -0600 | [diff] [blame] | 1801 | goto out_drop_sem; |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1802 | |
| 1803 | root_flags = btrfs_root_flags(&root->root_item); |
David Sterba | 2c68653 | 2013-12-16 17:34:17 +0100 | [diff] [blame] | 1804 | if (flags & BTRFS_SUBVOL_RDONLY) { |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1805 | btrfs_set_root_flags(&root->root_item, |
| 1806 | root_flags | BTRFS_ROOT_SUBVOL_RDONLY); |
David Sterba | 2c68653 | 2013-12-16 17:34:17 +0100 | [diff] [blame] | 1807 | } else { |
| 1808 | /* |
| 1809 | * Block RO -> RW transition if this subvolume is involved in |
| 1810 | * send |
| 1811 | */ |
| 1812 | spin_lock(&root->root_item_lock); |
| 1813 | if (root->send_in_progress == 0) { |
| 1814 | btrfs_set_root_flags(&root->root_item, |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1815 | root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); |
David Sterba | 2c68653 | 2013-12-16 17:34:17 +0100 | [diff] [blame] | 1816 | spin_unlock(&root->root_item_lock); |
| 1817 | } else { |
| 1818 | spin_unlock(&root->root_item_lock); |
| 1819 | btrfs_warn(root->fs_info, |
| 1820 | "Attempt to set subvolume %llu read-write during send", |
| 1821 | root->root_key.objectid); |
| 1822 | ret = -EPERM; |
| 1823 | goto out_drop_sem; |
| 1824 | } |
| 1825 | } |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1826 | |
| 1827 | trans = btrfs_start_transaction(root, 1); |
| 1828 | if (IS_ERR(trans)) { |
| 1829 | ret = PTR_ERR(trans); |
| 1830 | goto out_reset; |
| 1831 | } |
| 1832 | |
Li Zefan | b4dc2b8 | 2011-02-16 06:06:34 +0000 | [diff] [blame] | 1833 | ret = btrfs_update_root(trans, root->fs_info->tree_root, |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1834 | &root->root_key, &root->root_item); |
| 1835 | |
| 1836 | btrfs_commit_transaction(trans, root); |
| 1837 | out_reset: |
| 1838 | if (ret) |
| 1839 | btrfs_set_root_flags(&root->root_item, root_flags); |
Liu Bo | b9ca066 | 2012-06-29 03:58:49 -0600 | [diff] [blame] | 1840 | out_drop_sem: |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1841 | up_write(&root->fs_info->subvol_sem); |
Liu Bo | b9ca066 | 2012-06-29 03:58:49 -0600 | [diff] [blame] | 1842 | out_drop_write: |
| 1843 | mnt_drop_write_file(file); |
| 1844 | out: |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 1845 | return ret; |
| 1846 | } |
| 1847 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 1848 | /* |
| 1849 | * helper to check if the subvolume references other subvolumes |
| 1850 | */ |
| 1851 | static noinline int may_destroy_subvol(struct btrfs_root *root) |
| 1852 | { |
| 1853 | struct btrfs_path *path; |
Josef Bacik | 175a2b8 | 2013-08-12 15:36:44 -0400 | [diff] [blame] | 1854 | struct btrfs_dir_item *di; |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 1855 | struct btrfs_key key; |
Josef Bacik | 175a2b8 | 2013-08-12 15:36:44 -0400 | [diff] [blame] | 1856 | u64 dir_id; |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 1857 | int ret; |
| 1858 | |
| 1859 | path = btrfs_alloc_path(); |
| 1860 | if (!path) |
| 1861 | return -ENOMEM; |
| 1862 | |
Josef Bacik | 175a2b8 | 2013-08-12 15:36:44 -0400 | [diff] [blame] | 1863 | /* Make sure this root isn't set as the default subvol */ |
| 1864 | dir_id = btrfs_super_root_dir(root->fs_info->super_copy); |
| 1865 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path, |
| 1866 | dir_id, "default", 7, 0); |
| 1867 | if (di && !IS_ERR(di)) { |
| 1868 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key); |
| 1869 | if (key.objectid == root->root_key.objectid) { |
Guangyu Sun | 72de6b5 | 2014-03-11 11:24:18 -0700 | [diff] [blame] | 1870 | ret = -EPERM; |
| 1871 | btrfs_err(root->fs_info, "deleting default subvolume " |
| 1872 | "%llu is not allowed", key.objectid); |
Josef Bacik | 175a2b8 | 2013-08-12 15:36:44 -0400 | [diff] [blame] | 1873 | goto out; |
| 1874 | } |
| 1875 | btrfs_release_path(path); |
| 1876 | } |
| 1877 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 1878 | key.objectid = root->root_key.objectid; |
| 1879 | key.type = BTRFS_ROOT_REF_KEY; |
| 1880 | key.offset = (u64)-1; |
| 1881 | |
| 1882 | ret = btrfs_search_slot(NULL, root->fs_info->tree_root, |
| 1883 | &key, path, 0, 0); |
| 1884 | if (ret < 0) |
| 1885 | goto out; |
| 1886 | BUG_ON(ret == 0); |
| 1887 | |
| 1888 | ret = 0; |
| 1889 | if (path->slots[0] > 0) { |
| 1890 | path->slots[0]--; |
| 1891 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); |
| 1892 | if (key.objectid == root->root_key.objectid && |
| 1893 | key.type == BTRFS_ROOT_REF_KEY) |
| 1894 | ret = -ENOTEMPTY; |
| 1895 | } |
| 1896 | out: |
| 1897 | btrfs_free_path(path); |
| 1898 | return ret; |
| 1899 | } |
| 1900 | |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1901 | static noinline int key_in_sk(struct btrfs_key *key, |
| 1902 | struct btrfs_ioctl_search_key *sk) |
| 1903 | { |
Chris Mason | abc6e13 | 2010-03-18 12:10:08 -0400 | [diff] [blame] | 1904 | struct btrfs_key test; |
| 1905 | int ret; |
| 1906 | |
| 1907 | test.objectid = sk->min_objectid; |
| 1908 | test.type = sk->min_type; |
| 1909 | test.offset = sk->min_offset; |
| 1910 | |
| 1911 | ret = btrfs_comp_cpu_keys(key, &test); |
| 1912 | if (ret < 0) |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1913 | return 0; |
Chris Mason | abc6e13 | 2010-03-18 12:10:08 -0400 | [diff] [blame] | 1914 | |
| 1915 | test.objectid = sk->max_objectid; |
| 1916 | test.type = sk->max_type; |
| 1917 | test.offset = sk->max_offset; |
| 1918 | |
| 1919 | ret = btrfs_comp_cpu_keys(key, &test); |
| 1920 | if (ret > 0) |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1921 | return 0; |
| 1922 | return 1; |
| 1923 | } |
| 1924 | |
| 1925 | static noinline int copy_to_sk(struct btrfs_root *root, |
| 1926 | struct btrfs_path *path, |
| 1927 | struct btrfs_key *key, |
| 1928 | struct btrfs_ioctl_search_key *sk, |
| 1929 | char *buf, |
| 1930 | unsigned long *sk_offset, |
| 1931 | int *num_found) |
| 1932 | { |
| 1933 | u64 found_transid; |
| 1934 | struct extent_buffer *leaf; |
| 1935 | struct btrfs_ioctl_search_header sh; |
| 1936 | unsigned long item_off; |
| 1937 | unsigned long item_len; |
| 1938 | int nritems; |
| 1939 | int i; |
| 1940 | int slot; |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1941 | int ret = 0; |
| 1942 | |
| 1943 | leaf = path->nodes[0]; |
| 1944 | slot = path->slots[0]; |
| 1945 | nritems = btrfs_header_nritems(leaf); |
| 1946 | |
| 1947 | if (btrfs_header_generation(leaf) > sk->max_transid) { |
| 1948 | i = nritems; |
| 1949 | goto advance_key; |
| 1950 | } |
| 1951 | found_transid = btrfs_header_generation(leaf); |
| 1952 | |
| 1953 | for (i = slot; i < nritems; i++) { |
| 1954 | item_off = btrfs_item_ptr_offset(leaf, i); |
| 1955 | item_len = btrfs_item_size_nr(leaf, i); |
| 1956 | |
Gabriel de Perthuis | 03b71c6 | 2013-05-06 17:40:18 +0000 | [diff] [blame] | 1957 | btrfs_item_key_to_cpu(leaf, key, i); |
| 1958 | if (!key_in_sk(key, sk)) |
| 1959 | continue; |
| 1960 | |
| 1961 | if (sizeof(sh) + item_len > BTRFS_SEARCH_ARGS_BUFSIZE) |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1962 | item_len = 0; |
| 1963 | |
| 1964 | if (sizeof(sh) + item_len + *sk_offset > |
| 1965 | BTRFS_SEARCH_ARGS_BUFSIZE) { |
| 1966 | ret = 1; |
| 1967 | goto overflow; |
| 1968 | } |
| 1969 | |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1970 | sh.objectid = key->objectid; |
| 1971 | sh.offset = key->offset; |
| 1972 | sh.type = key->type; |
| 1973 | sh.len = item_len; |
| 1974 | sh.transid = found_transid; |
| 1975 | |
| 1976 | /* copy search result header */ |
| 1977 | memcpy(buf + *sk_offset, &sh, sizeof(sh)); |
| 1978 | *sk_offset += sizeof(sh); |
| 1979 | |
| 1980 | if (item_len) { |
| 1981 | char *p = buf + *sk_offset; |
| 1982 | /* copy the item */ |
| 1983 | read_extent_buffer(leaf, p, |
| 1984 | item_off, item_len); |
| 1985 | *sk_offset += item_len; |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1986 | } |
Hugo Mills | e215686 | 2011-05-14 17:43:41 +0000 | [diff] [blame] | 1987 | (*num_found)++; |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1988 | |
| 1989 | if (*num_found >= sk->nr_items) |
| 1990 | break; |
| 1991 | } |
| 1992 | advance_key: |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 1993 | ret = 0; |
Chris Mason | abc6e13 | 2010-03-18 12:10:08 -0400 | [diff] [blame] | 1994 | if (key->offset < (u64)-1 && key->offset < sk->max_offset) |
| 1995 | key->offset++; |
| 1996 | else if (key->type < (u8)-1 && key->type < sk->max_type) { |
| 1997 | key->offset = 0; |
| 1998 | key->type++; |
| 1999 | } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { |
| 2000 | key->offset = 0; |
| 2001 | key->type = 0; |
| 2002 | key->objectid++; |
| 2003 | } else |
| 2004 | ret = 1; |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2005 | overflow: |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2006 | return ret; |
| 2007 | } |
| 2008 | |
| 2009 | static noinline int search_ioctl(struct inode *inode, |
| 2010 | struct btrfs_ioctl_search_args *args) |
| 2011 | { |
| 2012 | struct btrfs_root *root; |
| 2013 | struct btrfs_key key; |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2014 | struct btrfs_path *path; |
| 2015 | struct btrfs_ioctl_search_key *sk = &args->key; |
| 2016 | struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; |
| 2017 | int ret; |
| 2018 | int num_found = 0; |
| 2019 | unsigned long sk_offset = 0; |
| 2020 | |
| 2021 | path = btrfs_alloc_path(); |
| 2022 | if (!path) |
| 2023 | return -ENOMEM; |
| 2024 | |
| 2025 | if (sk->tree_id == 0) { |
| 2026 | /* search the root of the inode that was passed */ |
| 2027 | root = BTRFS_I(inode)->root; |
| 2028 | } else { |
| 2029 | key.objectid = sk->tree_id; |
| 2030 | key.type = BTRFS_ROOT_ITEM_KEY; |
| 2031 | key.offset = (u64)-1; |
| 2032 | root = btrfs_read_fs_root_no_name(info, &key); |
| 2033 | if (IS_ERR(root)) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 2034 | printk(KERN_ERR "BTRFS: could not find root %llu\n", |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2035 | sk->tree_id); |
| 2036 | btrfs_free_path(path); |
| 2037 | return -ENOENT; |
| 2038 | } |
| 2039 | } |
| 2040 | |
| 2041 | key.objectid = sk->min_objectid; |
| 2042 | key.type = sk->min_type; |
| 2043 | key.offset = sk->min_offset; |
| 2044 | |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2045 | path->keep_locks = 1; |
| 2046 | |
Dulshani Gunawardhana | 6787125 | 2013-10-31 10:33:04 +0530 | [diff] [blame] | 2047 | while (1) { |
Filipe David Borba Manana | 6174d3c | 2013-10-01 16:13:42 +0100 | [diff] [blame] | 2048 | ret = btrfs_search_forward(root, &key, path, sk->min_transid); |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2049 | if (ret != 0) { |
| 2050 | if (ret > 0) |
| 2051 | ret = 0; |
| 2052 | goto err; |
| 2053 | } |
| 2054 | ret = copy_to_sk(root, path, &key, sk, args->buf, |
| 2055 | &sk_offset, &num_found); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 2056 | btrfs_release_path(path); |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2057 | if (ret || num_found >= sk->nr_items) |
| 2058 | break; |
| 2059 | |
| 2060 | } |
| 2061 | ret = 0; |
| 2062 | err: |
| 2063 | sk->nr_items = num_found; |
| 2064 | btrfs_free_path(path); |
| 2065 | return ret; |
| 2066 | } |
| 2067 | |
| 2068 | static noinline int btrfs_ioctl_tree_search(struct file *file, |
| 2069 | void __user *argp) |
| 2070 | { |
| 2071 | struct btrfs_ioctl_search_args *args; |
| 2072 | struct inode *inode; |
| 2073 | int ret; |
| 2074 | |
| 2075 | if (!capable(CAP_SYS_ADMIN)) |
| 2076 | return -EPERM; |
| 2077 | |
Julia Lawall | 2354d08 | 2010-10-29 15:14:18 -0400 | [diff] [blame] | 2078 | args = memdup_user(argp, sizeof(*args)); |
| 2079 | if (IS_ERR(args)) |
| 2080 | return PTR_ERR(args); |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2081 | |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 2082 | inode = file_inode(file); |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2083 | ret = search_ioctl(inode, args); |
| 2084 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) |
| 2085 | ret = -EFAULT; |
| 2086 | kfree(args); |
| 2087 | return ret; |
| 2088 | } |
| 2089 | |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 2090 | /* |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2091 | * Search INODE_REFs to identify path name of 'dirid' directory |
| 2092 | * in a 'tree_id' tree. and sets path name to 'name'. |
| 2093 | */ |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 2094 | static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, |
| 2095 | u64 tree_id, u64 dirid, char *name) |
| 2096 | { |
| 2097 | struct btrfs_root *root; |
| 2098 | struct btrfs_key key; |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2099 | char *ptr; |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 2100 | int ret = -1; |
| 2101 | int slot; |
| 2102 | int len; |
| 2103 | int total_len = 0; |
| 2104 | struct btrfs_inode_ref *iref; |
| 2105 | struct extent_buffer *l; |
| 2106 | struct btrfs_path *path; |
| 2107 | |
| 2108 | if (dirid == BTRFS_FIRST_FREE_OBJECTID) { |
| 2109 | name[0]='\0'; |
| 2110 | return 0; |
| 2111 | } |
| 2112 | |
| 2113 | path = btrfs_alloc_path(); |
| 2114 | if (!path) |
| 2115 | return -ENOMEM; |
| 2116 | |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2117 | ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 2118 | |
| 2119 | key.objectid = tree_id; |
| 2120 | key.type = BTRFS_ROOT_ITEM_KEY; |
| 2121 | key.offset = (u64)-1; |
| 2122 | root = btrfs_read_fs_root_no_name(info, &key); |
| 2123 | if (IS_ERR(root)) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 2124 | printk(KERN_ERR "BTRFS: could not find root %llu\n", tree_id); |
Chris Mason | 8ad6fca | 2010-03-18 12:23:10 -0400 | [diff] [blame] | 2125 | ret = -ENOENT; |
| 2126 | goto out; |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 2127 | } |
| 2128 | |
| 2129 | key.objectid = dirid; |
| 2130 | key.type = BTRFS_INODE_REF_KEY; |
Chris Mason | 8ad6fca | 2010-03-18 12:23:10 -0400 | [diff] [blame] | 2131 | key.offset = (u64)-1; |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 2132 | |
Dulshani Gunawardhana | 6787125 | 2013-10-31 10:33:04 +0530 | [diff] [blame] | 2133 | while (1) { |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 2134 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 2135 | if (ret < 0) |
| 2136 | goto out; |
Filipe David Borba Manana | 18674c6 | 2013-08-14 03:00:21 +0100 | [diff] [blame] | 2137 | else if (ret > 0) { |
| 2138 | ret = btrfs_previous_item(root, path, dirid, |
| 2139 | BTRFS_INODE_REF_KEY); |
| 2140 | if (ret < 0) |
| 2141 | goto out; |
| 2142 | else if (ret > 0) { |
| 2143 | ret = -ENOENT; |
| 2144 | goto out; |
| 2145 | } |
| 2146 | } |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 2147 | |
| 2148 | l = path->nodes[0]; |
| 2149 | slot = path->slots[0]; |
| 2150 | btrfs_item_key_to_cpu(l, &key, slot); |
| 2151 | |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 2152 | iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); |
| 2153 | len = btrfs_inode_ref_name_len(l, iref); |
| 2154 | ptr -= len + 1; |
| 2155 | total_len += len + 1; |
Filipe David Borba Manana | a696cf3 | 2013-08-14 03:00:20 +0100 | [diff] [blame] | 2156 | if (ptr < name) { |
| 2157 | ret = -ENAMETOOLONG; |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 2158 | goto out; |
Filipe David Borba Manana | a696cf3 | 2013-08-14 03:00:20 +0100 | [diff] [blame] | 2159 | } |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 2160 | |
| 2161 | *(ptr + len) = '/'; |
Dulshani Gunawardhana | 6787125 | 2013-10-31 10:33:04 +0530 | [diff] [blame] | 2162 | read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 2163 | |
| 2164 | if (key.offset == BTRFS_FIRST_FREE_OBJECTID) |
| 2165 | break; |
| 2166 | |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 2167 | btrfs_release_path(path); |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 2168 | key.objectid = key.offset; |
Chris Mason | 8ad6fca | 2010-03-18 12:23:10 -0400 | [diff] [blame] | 2169 | key.offset = (u64)-1; |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 2170 | dirid = key.objectid; |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 2171 | } |
Li Zefan | 77906a50 | 2011-07-14 03:16:00 +0000 | [diff] [blame] | 2172 | memmove(name, ptr, total_len); |
Dulshani Gunawardhana | 6787125 | 2013-10-31 10:33:04 +0530 | [diff] [blame] | 2173 | name[total_len] = '\0'; |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 2174 | ret = 0; |
| 2175 | out: |
| 2176 | btrfs_free_path(path); |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2177 | return ret; |
| 2178 | } |
| 2179 | |
| 2180 | static noinline int btrfs_ioctl_ino_lookup(struct file *file, |
| 2181 | void __user *argp) |
| 2182 | { |
| 2183 | struct btrfs_ioctl_ino_lookup_args *args; |
| 2184 | struct inode *inode; |
| 2185 | int ret; |
| 2186 | |
| 2187 | if (!capable(CAP_SYS_ADMIN)) |
| 2188 | return -EPERM; |
| 2189 | |
Julia Lawall | 2354d08 | 2010-10-29 15:14:18 -0400 | [diff] [blame] | 2190 | args = memdup_user(argp, sizeof(*args)); |
| 2191 | if (IS_ERR(args)) |
| 2192 | return PTR_ERR(args); |
Dan Carpenter | c2b9692 | 2010-03-20 11:24:15 +0000 | [diff] [blame] | 2193 | |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 2194 | inode = file_inode(file); |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2195 | |
Chris Mason | 1b53ac4 | 2010-03-18 12:17:05 -0400 | [diff] [blame] | 2196 | if (args->treeid == 0) |
| 2197 | args->treeid = BTRFS_I(inode)->root->root_key.objectid; |
| 2198 | |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 2199 | ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, |
| 2200 | args->treeid, args->objectid, |
| 2201 | args->name); |
| 2202 | |
| 2203 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) |
| 2204 | ret = -EFAULT; |
| 2205 | |
| 2206 | kfree(args); |
TARUISI Hiroaki | 98d377a | 2009-11-18 05:42:14 +0000 | [diff] [blame] | 2207 | return ret; |
| 2208 | } |
| 2209 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2210 | static noinline int btrfs_ioctl_snap_destroy(struct file *file, |
| 2211 | void __user *arg) |
| 2212 | { |
Al Viro | 54563d4 | 2013-09-01 15:57:51 -0400 | [diff] [blame] | 2213 | struct dentry *parent = file->f_path.dentry; |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2214 | struct dentry *dentry; |
| 2215 | struct inode *dir = parent->d_inode; |
| 2216 | struct inode *inode; |
| 2217 | struct btrfs_root *root = BTRFS_I(dir)->root; |
| 2218 | struct btrfs_root *dest = NULL; |
| 2219 | struct btrfs_ioctl_vol_args *vol_args; |
| 2220 | struct btrfs_trans_handle *trans; |
Miao Xie | c58aaad | 2013-02-28 10:05:36 +0000 | [diff] [blame] | 2221 | struct btrfs_block_rsv block_rsv; |
| 2222 | u64 qgroup_reserved; |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2223 | int namelen; |
| 2224 | int ret; |
| 2225 | int err = 0; |
| 2226 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2227 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
| 2228 | if (IS_ERR(vol_args)) |
| 2229 | return PTR_ERR(vol_args); |
| 2230 | |
| 2231 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
| 2232 | namelen = strlen(vol_args->name); |
| 2233 | if (strchr(vol_args->name, '/') || |
| 2234 | strncmp(vol_args->name, "..", namelen) == 0) { |
| 2235 | err = -EINVAL; |
| 2236 | goto out; |
| 2237 | } |
| 2238 | |
Al Viro | a561be7 | 2011-11-23 11:57:51 -0500 | [diff] [blame] | 2239 | err = mnt_want_write_file(file); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2240 | if (err) |
| 2241 | goto out; |
| 2242 | |
David Sterba | 5c50c9b | 2013-03-22 18:12:51 +0000 | [diff] [blame] | 2243 | err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); |
| 2244 | if (err == -EINTR) |
David Sterba | e43f998 | 2013-12-06 17:51:32 +0100 | [diff] [blame] | 2245 | goto out_drop_write; |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2246 | dentry = lookup_one_len(vol_args->name, parent, namelen); |
| 2247 | if (IS_ERR(dentry)) { |
| 2248 | err = PTR_ERR(dentry); |
| 2249 | goto out_unlock_dir; |
| 2250 | } |
| 2251 | |
| 2252 | if (!dentry->d_inode) { |
| 2253 | err = -ENOENT; |
| 2254 | goto out_dput; |
| 2255 | } |
| 2256 | |
| 2257 | inode = dentry->d_inode; |
Sage Weil | 4260f7c | 2010-10-29 15:46:43 -0400 | [diff] [blame] | 2258 | dest = BTRFS_I(inode)->root; |
Dulshani Gunawardhana | 6787125 | 2013-10-31 10:33:04 +0530 | [diff] [blame] | 2259 | if (!capable(CAP_SYS_ADMIN)) { |
Sage Weil | 4260f7c | 2010-10-29 15:46:43 -0400 | [diff] [blame] | 2260 | /* |
| 2261 | * Regular user. Only allow this with a special mount |
| 2262 | * option, when the user has write+exec access to the |
| 2263 | * subvol root, and when rmdir(2) would have been |
| 2264 | * allowed. |
| 2265 | * |
| 2266 | * Note that this is _not_ check that the subvol is |
| 2267 | * empty or doesn't contain data that we wouldn't |
| 2268 | * otherwise be able to delete. |
| 2269 | * |
| 2270 | * Users who want to delete empty subvols should try |
| 2271 | * rmdir(2). |
| 2272 | */ |
| 2273 | err = -EPERM; |
| 2274 | if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) |
| 2275 | goto out_dput; |
| 2276 | |
| 2277 | /* |
| 2278 | * Do not allow deletion if the parent dir is the same |
| 2279 | * as the dir to be deleted. That means the ioctl |
| 2280 | * must be called on the dentry referencing the root |
| 2281 | * of the subvol, not a random directory contained |
| 2282 | * within it. |
| 2283 | */ |
| 2284 | err = -EINVAL; |
| 2285 | if (root == dest) |
| 2286 | goto out_dput; |
| 2287 | |
| 2288 | err = inode_permission(inode, MAY_WRITE | MAY_EXEC); |
| 2289 | if (err) |
| 2290 | goto out_dput; |
Sage Weil | 4260f7c | 2010-10-29 15:46:43 -0400 | [diff] [blame] | 2291 | } |
| 2292 | |
Miao Xie | 5c39da5 | 2012-10-22 11:39:53 +0000 | [diff] [blame] | 2293 | /* check if subvolume may be deleted by a user */ |
| 2294 | err = btrfs_may_delete(dir, dentry, 1); |
| 2295 | if (err) |
| 2296 | goto out_dput; |
| 2297 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2298 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2299 | err = -EINVAL; |
| 2300 | goto out_dput; |
| 2301 | } |
| 2302 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2303 | mutex_lock(&inode->i_mutex); |
| 2304 | err = d_invalidate(dentry); |
| 2305 | if (err) |
| 2306 | goto out_unlock; |
| 2307 | |
| 2308 | down_write(&root->fs_info->subvol_sem); |
| 2309 | |
| 2310 | err = may_destroy_subvol(dest); |
| 2311 | if (err) |
| 2312 | goto out_up_write; |
| 2313 | |
Miao Xie | c58aaad | 2013-02-28 10:05:36 +0000 | [diff] [blame] | 2314 | btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); |
| 2315 | /* |
| 2316 | * One for dir inode, two for dir entries, two for root |
| 2317 | * ref/backref. |
| 2318 | */ |
| 2319 | err = btrfs_subvolume_reserve_metadata(root, &block_rsv, |
Jeff Mahoney | ee3441b | 2013-07-09 16:37:21 -0400 | [diff] [blame] | 2320 | 5, &qgroup_reserved, true); |
Miao Xie | c58aaad | 2013-02-28 10:05:36 +0000 | [diff] [blame] | 2321 | if (err) |
| 2322 | goto out_up_write; |
| 2323 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2324 | trans = btrfs_start_transaction(root, 0); |
| 2325 | if (IS_ERR(trans)) { |
| 2326 | err = PTR_ERR(trans); |
Miao Xie | c58aaad | 2013-02-28 10:05:36 +0000 | [diff] [blame] | 2327 | goto out_release; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2328 | } |
Miao Xie | c58aaad | 2013-02-28 10:05:36 +0000 | [diff] [blame] | 2329 | trans->block_rsv = &block_rsv; |
| 2330 | trans->bytes_reserved = block_rsv.size; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2331 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2332 | ret = btrfs_unlink_subvol(trans, root, dir, |
| 2333 | dest->root_key.objectid, |
| 2334 | dentry->d_name.name, |
| 2335 | dentry->d_name.len); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2336 | if (ret) { |
| 2337 | err = ret; |
| 2338 | btrfs_abort_transaction(trans, root, ret); |
| 2339 | goto out_end_trans; |
| 2340 | } |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2341 | |
| 2342 | btrfs_record_root_in_trans(trans, dest); |
| 2343 | |
| 2344 | memset(&dest->root_item.drop_progress, 0, |
| 2345 | sizeof(dest->root_item.drop_progress)); |
| 2346 | dest->root_item.drop_level = 0; |
| 2347 | btrfs_set_root_refs(&dest->root_item, 0); |
| 2348 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2349 | if (!xchg(&dest->orphan_item_inserted, 1)) { |
| 2350 | ret = btrfs_insert_orphan_item(trans, |
| 2351 | root->fs_info->tree_root, |
| 2352 | dest->root_key.objectid); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2353 | if (ret) { |
| 2354 | btrfs_abort_transaction(trans, root, ret); |
| 2355 | err = ret; |
| 2356 | goto out_end_trans; |
| 2357 | } |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2358 | } |
Stefan Behrens | dd5f961 | 2013-08-15 17:11:20 +0200 | [diff] [blame] | 2359 | |
| 2360 | ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, |
| 2361 | dest->root_item.uuid, BTRFS_UUID_KEY_SUBVOL, |
| 2362 | dest->root_key.objectid); |
| 2363 | if (ret && ret != -ENOENT) { |
| 2364 | btrfs_abort_transaction(trans, root, ret); |
| 2365 | err = ret; |
| 2366 | goto out_end_trans; |
| 2367 | } |
| 2368 | if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) { |
| 2369 | ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, |
| 2370 | dest->root_item.received_uuid, |
| 2371 | BTRFS_UUID_KEY_RECEIVED_SUBVOL, |
| 2372 | dest->root_key.objectid); |
| 2373 | if (ret && ret != -ENOENT) { |
| 2374 | btrfs_abort_transaction(trans, root, ret); |
| 2375 | err = ret; |
| 2376 | goto out_end_trans; |
| 2377 | } |
| 2378 | } |
| 2379 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2380 | out_end_trans: |
Miao Xie | c58aaad | 2013-02-28 10:05:36 +0000 | [diff] [blame] | 2381 | trans->block_rsv = NULL; |
| 2382 | trans->bytes_reserved = 0; |
Sage Weil | 531cb13 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 2383 | ret = btrfs_end_transaction(trans, root); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2384 | if (ret && !err) |
| 2385 | err = ret; |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2386 | inode->i_flags |= S_DEAD; |
Miao Xie | c58aaad | 2013-02-28 10:05:36 +0000 | [diff] [blame] | 2387 | out_release: |
| 2388 | btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2389 | out_up_write: |
| 2390 | up_write(&root->fs_info->subvol_sem); |
| 2391 | out_unlock: |
| 2392 | mutex_unlock(&inode->i_mutex); |
| 2393 | if (!err) { |
Yan, Zheng | efefb14 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 2394 | shrink_dcache_sb(root->fs_info->sb); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2395 | btrfs_invalidate_inodes(dest); |
| 2396 | d_delete(dentry); |
Liu Bo | fa6ac87 | 2013-02-20 14:10:23 +0000 | [diff] [blame] | 2397 | |
| 2398 | /* the last ref */ |
| 2399 | if (dest->cache_inode) { |
| 2400 | iput(dest->cache_inode); |
| 2401 | dest->cache_inode = NULL; |
| 2402 | } |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2403 | } |
| 2404 | out_dput: |
| 2405 | dput(dentry); |
| 2406 | out_unlock_dir: |
| 2407 | mutex_unlock(&dir->i_mutex); |
David Sterba | e43f998 | 2013-12-06 17:51:32 +0100 | [diff] [blame] | 2408 | out_drop_write: |
Al Viro | 2a79f17 | 2011-12-09 08:06:57 -0500 | [diff] [blame] | 2409 | mnt_drop_write_file(file); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2410 | out: |
| 2411 | kfree(vol_args); |
| 2412 | return err; |
| 2413 | } |
| 2414 | |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 2415 | static int btrfs_ioctl_defrag(struct file *file, void __user *argp) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2416 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 2417 | struct inode *inode = file_inode(file); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2418 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 2419 | struct btrfs_ioctl_defrag_range_args *range; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 2420 | int ret; |
| 2421 | |
Ilya Dryomov | 25122d1 | 2013-01-20 15:57:57 +0200 | [diff] [blame] | 2422 | ret = mnt_want_write_file(file); |
| 2423 | if (ret) |
| 2424 | return ret; |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 2425 | |
Ilya Dryomov | 25122d1 | 2013-01-20 15:57:57 +0200 | [diff] [blame] | 2426 | if (btrfs_root_readonly(root)) { |
| 2427 | ret = -EROFS; |
| 2428 | goto out; |
Stefan Behrens | 5ac00ad | 2012-11-05 17:54:08 +0100 | [diff] [blame] | 2429 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2430 | |
| 2431 | switch (inode->i_mode & S_IFMT) { |
| 2432 | case S_IFDIR: |
Chris Mason | e441d54 | 2009-01-05 16:57:23 -0500 | [diff] [blame] | 2433 | if (!capable(CAP_SYS_ADMIN)) { |
| 2434 | ret = -EPERM; |
| 2435 | goto out; |
| 2436 | } |
Eric Sandeen | de78b51 | 2013-01-31 18:21:12 +0000 | [diff] [blame] | 2437 | ret = btrfs_defrag_root(root); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2438 | if (ret) |
| 2439 | goto out; |
Eric Sandeen | de78b51 | 2013-01-31 18:21:12 +0000 | [diff] [blame] | 2440 | ret = btrfs_defrag_root(root->fs_info->extent_root); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2441 | break; |
| 2442 | case S_IFREG: |
Chris Mason | e441d54 | 2009-01-05 16:57:23 -0500 | [diff] [blame] | 2443 | if (!(file->f_mode & FMODE_WRITE)) { |
| 2444 | ret = -EINVAL; |
| 2445 | goto out; |
| 2446 | } |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 2447 | |
| 2448 | range = kzalloc(sizeof(*range), GFP_KERNEL); |
| 2449 | if (!range) { |
| 2450 | ret = -ENOMEM; |
| 2451 | goto out; |
| 2452 | } |
| 2453 | |
| 2454 | if (argp) { |
| 2455 | if (copy_from_user(range, argp, |
| 2456 | sizeof(*range))) { |
| 2457 | ret = -EFAULT; |
| 2458 | kfree(range); |
Dan Carpenter | 683be16 | 2010-03-20 11:24:48 +0000 | [diff] [blame] | 2459 | goto out; |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 2460 | } |
| 2461 | /* compression requires us to start the IO */ |
| 2462 | if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { |
| 2463 | range->flags |= BTRFS_DEFRAG_RANGE_START_IO; |
| 2464 | range->extent_thresh = (u32)-1; |
| 2465 | } |
| 2466 | } else { |
| 2467 | /* the rest are all set to zero by kzalloc */ |
| 2468 | range->len = (u64)-1; |
| 2469 | } |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 2470 | ret = btrfs_defrag_file(file_inode(file), file, |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 2471 | range, 0, 0); |
| 2472 | if (ret > 0) |
| 2473 | ret = 0; |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 2474 | kfree(range); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2475 | break; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2476 | default: |
| 2477 | ret = -EINVAL; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2478 | } |
Chris Mason | e441d54 | 2009-01-05 16:57:23 -0500 | [diff] [blame] | 2479 | out: |
Ilya Dryomov | 25122d1 | 2013-01-20 15:57:57 +0200 | [diff] [blame] | 2480 | mnt_drop_write_file(file); |
Chris Mason | e441d54 | 2009-01-05 16:57:23 -0500 | [diff] [blame] | 2481 | return ret; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2482 | } |
| 2483 | |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 2484 | 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] | 2485 | { |
| 2486 | struct btrfs_ioctl_vol_args *vol_args; |
| 2487 | int ret; |
| 2488 | |
Chris Mason | e441d54 | 2009-01-05 16:57:23 -0500 | [diff] [blame] | 2489 | if (!capable(CAP_SYS_ADMIN)) |
| 2490 | return -EPERM; |
| 2491 | |
Stefan Behrens | 5ac00ad | 2012-11-05 17:54:08 +0100 | [diff] [blame] | 2492 | if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, |
| 2493 | 1)) { |
Anand Jain | e57138b | 2013-08-21 11:44:48 +0800 | [diff] [blame] | 2494 | return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 2495 | } |
| 2496 | |
Stefan Behrens | 5ac00ad | 2012-11-05 17:54:08 +0100 | [diff] [blame] | 2497 | mutex_lock(&root->fs_info->volume_mutex); |
Li Zefan | dae7b66 | 2009-04-08 15:06:54 +0800 | [diff] [blame] | 2498 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 2499 | if (IS_ERR(vol_args)) { |
| 2500 | ret = PTR_ERR(vol_args); |
| 2501 | goto out; |
| 2502 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2503 | |
Mark Fasheh | 5516e59 | 2008-07-24 12:20:14 -0400 | [diff] [blame] | 2504 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2505 | ret = btrfs_init_new_device(root, vol_args->name); |
| 2506 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2507 | kfree(vol_args); |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 2508 | out: |
| 2509 | mutex_unlock(&root->fs_info->volume_mutex); |
Stefan Behrens | 5ac00ad | 2012-11-05 17:54:08 +0100 | [diff] [blame] | 2510 | atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2511 | return ret; |
| 2512 | } |
| 2513 | |
Miao Xie | da24927 | 2012-11-26 08:44:50 +0000 | [diff] [blame] | 2514 | static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2515 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 2516 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2517 | struct btrfs_ioctl_vol_args *vol_args; |
| 2518 | int ret; |
| 2519 | |
Chris Mason | e441d54 | 2009-01-05 16:57:23 -0500 | [diff] [blame] | 2520 | if (!capable(CAP_SYS_ADMIN)) |
| 2521 | return -EPERM; |
| 2522 | |
Miao Xie | da24927 | 2012-11-26 08:44:50 +0000 | [diff] [blame] | 2523 | ret = mnt_want_write_file(file); |
| 2524 | if (ret) |
| 2525 | return ret; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 2526 | |
Li Zefan | dae7b66 | 2009-04-08 15:06:54 +0800 | [diff] [blame] | 2527 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 2528 | if (IS_ERR(vol_args)) { |
| 2529 | ret = PTR_ERR(vol_args); |
| 2530 | goto out; |
| 2531 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2532 | |
Mark Fasheh | 5516e59 | 2008-07-24 12:20:14 -0400 | [diff] [blame] | 2533 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2534 | |
Anand Jain | 183860f | 2013-05-17 10:52:45 +0000 | [diff] [blame] | 2535 | if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, |
| 2536 | 1)) { |
| 2537 | ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
| 2538 | goto out; |
| 2539 | } |
| 2540 | |
| 2541 | mutex_lock(&root->fs_info->volume_mutex); |
| 2542 | ret = btrfs_rm_device(root, vol_args->name); |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 2543 | mutex_unlock(&root->fs_info->volume_mutex); |
Stefan Behrens | 5ac00ad | 2012-11-05 17:54:08 +0100 | [diff] [blame] | 2544 | atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); |
Anand Jain | 183860f | 2013-05-17 10:52:45 +0000 | [diff] [blame] | 2545 | |
| 2546 | out: |
| 2547 | kfree(vol_args); |
Ilya Dryomov | 4ac20c7 | 2013-01-20 15:57:57 +0200 | [diff] [blame] | 2548 | mnt_drop_write_file(file); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2549 | return ret; |
| 2550 | } |
| 2551 | |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 2552 | static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) |
| 2553 | { |
Li Zefan | 027ed2f | 2011-06-08 08:27:56 +0000 | [diff] [blame] | 2554 | struct btrfs_ioctl_fs_info_args *fi_args; |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 2555 | struct btrfs_device *device; |
| 2556 | struct btrfs_device *next; |
| 2557 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; |
Li Zefan | 027ed2f | 2011-06-08 08:27:56 +0000 | [diff] [blame] | 2558 | int ret = 0; |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 2559 | |
| 2560 | if (!capable(CAP_SYS_ADMIN)) |
| 2561 | return -EPERM; |
| 2562 | |
Li Zefan | 027ed2f | 2011-06-08 08:27:56 +0000 | [diff] [blame] | 2563 | fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); |
| 2564 | if (!fi_args) |
| 2565 | return -ENOMEM; |
| 2566 | |
Filipe David Borba Manana | f717175 | 2013-08-12 20:56:58 +0100 | [diff] [blame] | 2567 | mutex_lock(&fs_devices->device_list_mutex); |
Li Zefan | 027ed2f | 2011-06-08 08:27:56 +0000 | [diff] [blame] | 2568 | fi_args->num_devices = fs_devices->num_devices; |
| 2569 | memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid)); |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 2570 | |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 2571 | list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { |
Li Zefan | 027ed2f | 2011-06-08 08:27:56 +0000 | [diff] [blame] | 2572 | if (device->devid > fi_args->max_id) |
| 2573 | fi_args->max_id = device->devid; |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 2574 | } |
| 2575 | mutex_unlock(&fs_devices->device_list_mutex); |
| 2576 | |
Li Zefan | 027ed2f | 2011-06-08 08:27:56 +0000 | [diff] [blame] | 2577 | if (copy_to_user(arg, fi_args, sizeof(*fi_args))) |
| 2578 | ret = -EFAULT; |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 2579 | |
Li Zefan | 027ed2f | 2011-06-08 08:27:56 +0000 | [diff] [blame] | 2580 | kfree(fi_args); |
| 2581 | return ret; |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 2582 | } |
| 2583 | |
| 2584 | static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) |
| 2585 | { |
| 2586 | struct btrfs_ioctl_dev_info_args *di_args; |
| 2587 | struct btrfs_device *dev; |
| 2588 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; |
| 2589 | int ret = 0; |
| 2590 | char *s_uuid = NULL; |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 2591 | |
| 2592 | if (!capable(CAP_SYS_ADMIN)) |
| 2593 | return -EPERM; |
| 2594 | |
| 2595 | di_args = memdup_user(arg, sizeof(*di_args)); |
| 2596 | if (IS_ERR(di_args)) |
| 2597 | return PTR_ERR(di_args); |
| 2598 | |
Stefan Behrens | dd5f961 | 2013-08-15 17:11:20 +0200 | [diff] [blame] | 2599 | if (!btrfs_is_empty_uuid(di_args->uuid)) |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 2600 | s_uuid = di_args->uuid; |
| 2601 | |
| 2602 | mutex_lock(&fs_devices->device_list_mutex); |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 2603 | 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] | 2604 | |
| 2605 | if (!dev) { |
| 2606 | ret = -ENODEV; |
| 2607 | goto out; |
| 2608 | } |
| 2609 | |
| 2610 | di_args->devid = dev->devid; |
| 2611 | di_args->bytes_used = dev->bytes_used; |
| 2612 | di_args->total_bytes = dev->total_bytes; |
| 2613 | memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); |
Jim Meyering | a27202f | 2012-04-26 18:36:56 +0200 | [diff] [blame] | 2614 | if (dev->name) { |
Josef Bacik | 606686e | 2012-06-04 14:03:51 -0400 | [diff] [blame] | 2615 | struct rcu_string *name; |
| 2616 | |
| 2617 | rcu_read_lock(); |
| 2618 | name = rcu_dereference(dev->name); |
| 2619 | strncpy(di_args->path, name->str, sizeof(di_args->path)); |
| 2620 | rcu_read_unlock(); |
Jim Meyering | a27202f | 2012-04-26 18:36:56 +0200 | [diff] [blame] | 2621 | di_args->path[sizeof(di_args->path) - 1] = 0; |
| 2622 | } else { |
Stefan Behrens | 99ba55a | 2012-03-19 16:17:22 +0100 | [diff] [blame] | 2623 | di_args->path[0] = '\0'; |
Jim Meyering | a27202f | 2012-04-26 18:36:56 +0200 | [diff] [blame] | 2624 | } |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 2625 | |
| 2626 | out: |
David Sterba | 55793c0 | 2013-04-26 15:20:23 +0000 | [diff] [blame] | 2627 | mutex_unlock(&fs_devices->device_list_mutex); |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 2628 | if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) |
| 2629 | ret = -EFAULT; |
| 2630 | |
| 2631 | kfree(di_args); |
| 2632 | return ret; |
| 2633 | } |
| 2634 | |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2635 | static struct page *extent_same_get_page(struct inode *inode, u64 off) |
| 2636 | { |
| 2637 | struct page *page; |
| 2638 | pgoff_t index; |
| 2639 | struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; |
| 2640 | |
| 2641 | index = off >> PAGE_CACHE_SHIFT; |
| 2642 | |
| 2643 | page = grab_cache_page(inode->i_mapping, index); |
| 2644 | if (!page) |
| 2645 | return NULL; |
| 2646 | |
| 2647 | if (!PageUptodate(page)) { |
| 2648 | if (extent_read_full_page_nolock(tree, page, btrfs_get_extent, |
| 2649 | 0)) |
| 2650 | return NULL; |
| 2651 | lock_page(page); |
| 2652 | if (!PageUptodate(page)) { |
| 2653 | unlock_page(page); |
| 2654 | page_cache_release(page); |
| 2655 | return NULL; |
| 2656 | } |
| 2657 | } |
| 2658 | unlock_page(page); |
| 2659 | |
| 2660 | return page; |
| 2661 | } |
| 2662 | |
Mark Fasheh | 77fe20dc | 2013-08-06 11:42:48 -0700 | [diff] [blame] | 2663 | static inline void lock_extent_range(struct inode *inode, u64 off, u64 len) |
| 2664 | { |
| 2665 | /* do any pending delalloc/csum calc on src, one way or |
| 2666 | another, and lock file content */ |
| 2667 | while (1) { |
| 2668 | struct btrfs_ordered_extent *ordered; |
| 2669 | lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); |
| 2670 | ordered = btrfs_lookup_first_ordered_extent(inode, |
| 2671 | off + len - 1); |
| 2672 | if (!ordered && |
| 2673 | !test_range_bit(&BTRFS_I(inode)->io_tree, off, |
| 2674 | off + len - 1, EXTENT_DELALLOC, 0, NULL)) |
| 2675 | break; |
| 2676 | unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); |
| 2677 | if (ordered) |
| 2678 | btrfs_put_ordered_extent(ordered); |
| 2679 | btrfs_wait_ordered_range(inode, off, len); |
| 2680 | } |
| 2681 | } |
| 2682 | |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2683 | static void btrfs_double_unlock(struct inode *inode1, u64 loff1, |
| 2684 | struct inode *inode2, u64 loff2, u64 len) |
| 2685 | { |
| 2686 | unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1); |
| 2687 | unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1); |
| 2688 | |
| 2689 | mutex_unlock(&inode1->i_mutex); |
| 2690 | mutex_unlock(&inode2->i_mutex); |
| 2691 | } |
| 2692 | |
| 2693 | static void btrfs_double_lock(struct inode *inode1, u64 loff1, |
| 2694 | struct inode *inode2, u64 loff2, u64 len) |
| 2695 | { |
| 2696 | if (inode1 < inode2) { |
| 2697 | swap(inode1, inode2); |
| 2698 | swap(loff1, loff2); |
| 2699 | } |
| 2700 | |
| 2701 | mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT); |
| 2702 | lock_extent_range(inode1, loff1, len); |
| 2703 | if (inode1 != inode2) { |
| 2704 | mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD); |
| 2705 | lock_extent_range(inode2, loff2, len); |
| 2706 | } |
| 2707 | } |
| 2708 | |
| 2709 | static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst, |
| 2710 | u64 dst_loff, u64 len) |
| 2711 | { |
| 2712 | int ret = 0; |
| 2713 | struct page *src_page, *dst_page; |
| 2714 | unsigned int cmp_len = PAGE_CACHE_SIZE; |
| 2715 | void *addr, *dst_addr; |
| 2716 | |
| 2717 | while (len) { |
| 2718 | if (len < PAGE_CACHE_SIZE) |
| 2719 | cmp_len = len; |
| 2720 | |
| 2721 | src_page = extent_same_get_page(src, loff); |
| 2722 | if (!src_page) |
| 2723 | return -EINVAL; |
| 2724 | dst_page = extent_same_get_page(dst, dst_loff); |
| 2725 | if (!dst_page) { |
| 2726 | page_cache_release(src_page); |
| 2727 | return -EINVAL; |
| 2728 | } |
| 2729 | addr = kmap_atomic(src_page); |
| 2730 | dst_addr = kmap_atomic(dst_page); |
| 2731 | |
| 2732 | flush_dcache_page(src_page); |
| 2733 | flush_dcache_page(dst_page); |
| 2734 | |
| 2735 | if (memcmp(addr, dst_addr, cmp_len)) |
| 2736 | ret = BTRFS_SAME_DATA_DIFFERS; |
| 2737 | |
| 2738 | kunmap_atomic(addr); |
| 2739 | kunmap_atomic(dst_addr); |
| 2740 | page_cache_release(src_page); |
| 2741 | page_cache_release(dst_page); |
| 2742 | |
| 2743 | if (ret) |
| 2744 | break; |
| 2745 | |
| 2746 | loff += cmp_len; |
| 2747 | dst_loff += cmp_len; |
| 2748 | len -= cmp_len; |
| 2749 | } |
| 2750 | |
| 2751 | return ret; |
| 2752 | } |
| 2753 | |
| 2754 | static int extent_same_check_offsets(struct inode *inode, u64 off, u64 len) |
| 2755 | { |
| 2756 | u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize; |
| 2757 | |
| 2758 | if (off + len > inode->i_size || off + len < off) |
| 2759 | return -EINVAL; |
| 2760 | /* Check that we are block aligned - btrfs_clone() requires this */ |
| 2761 | if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs)) |
| 2762 | return -EINVAL; |
| 2763 | |
| 2764 | return 0; |
| 2765 | } |
| 2766 | |
| 2767 | static int btrfs_extent_same(struct inode *src, u64 loff, u64 len, |
| 2768 | struct inode *dst, u64 dst_loff) |
| 2769 | { |
| 2770 | int ret; |
| 2771 | |
| 2772 | /* |
| 2773 | * btrfs_clone() can't handle extents in the same file |
| 2774 | * yet. Once that works, we can drop this check and replace it |
| 2775 | * with a check for the same inode, but overlapping extents. |
| 2776 | */ |
| 2777 | if (src == dst) |
| 2778 | return -EINVAL; |
| 2779 | |
| 2780 | btrfs_double_lock(src, loff, dst, dst_loff, len); |
| 2781 | |
| 2782 | ret = extent_same_check_offsets(src, loff, len); |
| 2783 | if (ret) |
| 2784 | goto out_unlock; |
| 2785 | |
| 2786 | ret = extent_same_check_offsets(dst, dst_loff, len); |
| 2787 | if (ret) |
| 2788 | goto out_unlock; |
| 2789 | |
| 2790 | /* don't make the dst file partly checksummed */ |
| 2791 | if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != |
| 2792 | (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) { |
| 2793 | ret = -EINVAL; |
| 2794 | goto out_unlock; |
| 2795 | } |
| 2796 | |
| 2797 | ret = btrfs_cmp_data(src, loff, dst, dst_loff, len); |
| 2798 | if (ret == 0) |
| 2799 | ret = btrfs_clone(src, dst, loff, len, len, dst_loff); |
| 2800 | |
| 2801 | out_unlock: |
| 2802 | btrfs_double_unlock(src, loff, dst, dst_loff, len); |
| 2803 | |
| 2804 | return ret; |
| 2805 | } |
| 2806 | |
| 2807 | #define BTRFS_MAX_DEDUPE_LEN (16 * 1024 * 1024) |
| 2808 | |
| 2809 | static long btrfs_ioctl_file_extent_same(struct file *file, |
| 2810 | void __user *argp) |
| 2811 | { |
Mark Fasheh | cbf8b8c | 2013-09-17 15:43:54 -0700 | [diff] [blame] | 2812 | struct btrfs_ioctl_same_args tmp; |
| 2813 | struct btrfs_ioctl_same_args *same; |
| 2814 | struct btrfs_ioctl_same_extent_info *info; |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2815 | struct inode *src = file->f_dentry->d_inode; |
| 2816 | struct file *dst_file = NULL; |
| 2817 | struct inode *dst; |
| 2818 | u64 off; |
| 2819 | u64 len; |
| 2820 | int i; |
| 2821 | int ret; |
Mark Fasheh | cbf8b8c | 2013-09-17 15:43:54 -0700 | [diff] [blame] | 2822 | unsigned long size; |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2823 | u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize; |
| 2824 | bool is_admin = capable(CAP_SYS_ADMIN); |
| 2825 | |
| 2826 | if (!(file->f_mode & FMODE_READ)) |
| 2827 | return -EINVAL; |
| 2828 | |
| 2829 | ret = mnt_want_write_file(file); |
| 2830 | if (ret) |
| 2831 | return ret; |
| 2832 | |
Mark Fasheh | cbf8b8c | 2013-09-17 15:43:54 -0700 | [diff] [blame] | 2833 | if (copy_from_user(&tmp, |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2834 | (struct btrfs_ioctl_same_args __user *)argp, |
Mark Fasheh | cbf8b8c | 2013-09-17 15:43:54 -0700 | [diff] [blame] | 2835 | sizeof(tmp))) { |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2836 | ret = -EFAULT; |
| 2837 | goto out; |
| 2838 | } |
| 2839 | |
Mark Fasheh | cbf8b8c | 2013-09-17 15:43:54 -0700 | [diff] [blame] | 2840 | size = sizeof(tmp) + |
| 2841 | tmp.dest_count * sizeof(struct btrfs_ioctl_same_extent_info); |
| 2842 | |
Geyslan G. Bem | 229eed4 | 2013-10-14 12:18:25 -0300 | [diff] [blame] | 2843 | same = memdup_user((struct btrfs_ioctl_same_args __user *)argp, size); |
Mark Fasheh | cbf8b8c | 2013-09-17 15:43:54 -0700 | [diff] [blame] | 2844 | |
Geyslan G. Bem | 229eed4 | 2013-10-14 12:18:25 -0300 | [diff] [blame] | 2845 | if (IS_ERR(same)) { |
| 2846 | ret = PTR_ERR(same); |
Mark Fasheh | cbf8b8c | 2013-09-17 15:43:54 -0700 | [diff] [blame] | 2847 | goto out; |
| 2848 | } |
| 2849 | |
| 2850 | off = same->logical_offset; |
| 2851 | len = same->length; |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2852 | |
| 2853 | /* |
| 2854 | * Limit the total length we will dedupe for each operation. |
| 2855 | * This is intended to bound the total time spent in this |
| 2856 | * ioctl to something sane. |
| 2857 | */ |
| 2858 | if (len > BTRFS_MAX_DEDUPE_LEN) |
| 2859 | len = BTRFS_MAX_DEDUPE_LEN; |
| 2860 | |
| 2861 | if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) { |
| 2862 | /* |
| 2863 | * Btrfs does not support blocksize < page_size. As a |
| 2864 | * result, btrfs_cmp_data() won't correctly handle |
| 2865 | * this situation without an update. |
| 2866 | */ |
| 2867 | ret = -EINVAL; |
| 2868 | goto out; |
| 2869 | } |
| 2870 | |
| 2871 | ret = -EISDIR; |
| 2872 | if (S_ISDIR(src->i_mode)) |
| 2873 | goto out; |
| 2874 | |
| 2875 | ret = -EACCES; |
| 2876 | if (!S_ISREG(src->i_mode)) |
| 2877 | goto out; |
| 2878 | |
Mark Fasheh | cbf8b8c | 2013-09-17 15:43:54 -0700 | [diff] [blame] | 2879 | /* pre-format output fields to sane values */ |
| 2880 | for (i = 0; i < same->dest_count; i++) { |
| 2881 | same->info[i].bytes_deduped = 0ULL; |
| 2882 | same->info[i].status = 0; |
| 2883 | } |
| 2884 | |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2885 | ret = 0; |
Mark Fasheh | cbf8b8c | 2013-09-17 15:43:54 -0700 | [diff] [blame] | 2886 | for (i = 0; i < same->dest_count; i++) { |
| 2887 | info = &same->info[i]; |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2888 | |
Mark Fasheh | cbf8b8c | 2013-09-17 15:43:54 -0700 | [diff] [blame] | 2889 | dst_file = fget(info->fd); |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2890 | if (!dst_file) { |
Mark Fasheh | cbf8b8c | 2013-09-17 15:43:54 -0700 | [diff] [blame] | 2891 | info->status = -EBADF; |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2892 | goto next; |
| 2893 | } |
| 2894 | |
| 2895 | if (!(is_admin || (dst_file->f_mode & FMODE_WRITE))) { |
Mark Fasheh | cbf8b8c | 2013-09-17 15:43:54 -0700 | [diff] [blame] | 2896 | info->status = -EINVAL; |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2897 | goto next; |
| 2898 | } |
| 2899 | |
Mark Fasheh | cbf8b8c | 2013-09-17 15:43:54 -0700 | [diff] [blame] | 2900 | info->status = -EXDEV; |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2901 | if (file->f_path.mnt != dst_file->f_path.mnt) |
| 2902 | goto next; |
| 2903 | |
| 2904 | dst = dst_file->f_dentry->d_inode; |
| 2905 | if (src->i_sb != dst->i_sb) |
| 2906 | goto next; |
| 2907 | |
| 2908 | if (S_ISDIR(dst->i_mode)) { |
Mark Fasheh | cbf8b8c | 2013-09-17 15:43:54 -0700 | [diff] [blame] | 2909 | info->status = -EISDIR; |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2910 | goto next; |
| 2911 | } |
| 2912 | |
| 2913 | if (!S_ISREG(dst->i_mode)) { |
Mark Fasheh | cbf8b8c | 2013-09-17 15:43:54 -0700 | [diff] [blame] | 2914 | info->status = -EACCES; |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2915 | goto next; |
| 2916 | } |
| 2917 | |
Mark Fasheh | cbf8b8c | 2013-09-17 15:43:54 -0700 | [diff] [blame] | 2918 | info->status = btrfs_extent_same(src, off, len, dst, |
| 2919 | info->logical_offset); |
| 2920 | if (info->status == 0) |
| 2921 | info->bytes_deduped += len; |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2922 | |
| 2923 | next: |
| 2924 | if (dst_file) |
| 2925 | fput(dst_file); |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2926 | } |
| 2927 | |
Mark Fasheh | cbf8b8c | 2013-09-17 15:43:54 -0700 | [diff] [blame] | 2928 | ret = copy_to_user(argp, same, size); |
| 2929 | if (ret) |
| 2930 | ret = -EFAULT; |
| 2931 | |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 2932 | out: |
| 2933 | mnt_drop_write_file(file); |
| 2934 | return ret; |
| 2935 | } |
| 2936 | |
Mark Fasheh | 32b7c68 | 2013-08-06 11:42:49 -0700 | [diff] [blame] | 2937 | /** |
| 2938 | * btrfs_clone() - clone a range from inode file to another |
| 2939 | * |
| 2940 | * @src: Inode to clone from |
| 2941 | * @inode: Inode to clone to |
| 2942 | * @off: Offset within source to start clone from |
| 2943 | * @olen: Original length, passed by user, of range to clone |
| 2944 | * @olen_aligned: Block-aligned value of olen, extent_same uses |
| 2945 | * identical values here |
| 2946 | * @destoff: Offset within @inode to start clone |
| 2947 | */ |
| 2948 | static int btrfs_clone(struct inode *src, struct inode *inode, |
| 2949 | u64 off, u64 olen, u64 olen_aligned, u64 destoff) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2950 | { |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2951 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Mark Fasheh | 32b7c68 | 2013-08-06 11:42:49 -0700 | [diff] [blame] | 2952 | struct btrfs_path *path = NULL; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2953 | struct extent_buffer *leaf; |
Mark Fasheh | 32b7c68 | 2013-08-06 11:42:49 -0700 | [diff] [blame] | 2954 | struct btrfs_trans_handle *trans; |
| 2955 | char *buf = NULL; |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 2956 | struct btrfs_key key; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2957 | u32 nritems; |
| 2958 | int slot; |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 2959 | int ret; |
Mark Fasheh | 32b7c68 | 2013-08-06 11:42:49 -0700 | [diff] [blame] | 2960 | u64 len = olen_aligned; |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 2961 | |
| 2962 | ret = -ENOMEM; |
| 2963 | buf = vmalloc(btrfs_level_size(root, 0)); |
| 2964 | if (!buf) |
Mark Fasheh | 32b7c68 | 2013-08-06 11:42:49 -0700 | [diff] [blame] | 2965 | return ret; |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 2966 | |
| 2967 | path = btrfs_alloc_path(); |
| 2968 | if (!path) { |
| 2969 | vfree(buf); |
Mark Fasheh | 32b7c68 | 2013-08-06 11:42:49 -0700 | [diff] [blame] | 2970 | return ret; |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 2971 | } |
Mark Fasheh | 32b7c68 | 2013-08-06 11:42:49 -0700 | [diff] [blame] | 2972 | |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 2973 | path->reada = 2; |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 2974 | /* clone data */ |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2975 | key.objectid = btrfs_ino(src); |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 2976 | key.type = BTRFS_EXTENT_DATA_KEY; |
| 2977 | key.offset = 0; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2978 | |
| 2979 | while (1) { |
| 2980 | /* |
| 2981 | * note the key will change type as we walk through the |
| 2982 | * tree. |
| 2983 | */ |
Filipe David Borba Manana | e4355f3 | 2014-01-13 19:35:01 +0000 | [diff] [blame] | 2984 | path->leave_spinning = 1; |
David Sterba | 362a20c | 2011-08-01 18:11:57 +0200 | [diff] [blame] | 2985 | ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, |
| 2986 | 0, 0); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2987 | if (ret < 0) |
| 2988 | goto out; |
| 2989 | |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 2990 | nritems = btrfs_header_nritems(path->nodes[0]); |
Filipe David Borba Manana | e4355f3 | 2014-01-13 19:35:01 +0000 | [diff] [blame] | 2991 | process_slot: |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 2992 | if (path->slots[0] >= nritems) { |
David Sterba | 362a20c | 2011-08-01 18:11:57 +0200 | [diff] [blame] | 2993 | ret = btrfs_next_leaf(BTRFS_I(src)->root, path); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2994 | if (ret < 0) |
| 2995 | goto out; |
| 2996 | if (ret > 0) |
| 2997 | break; |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 2998 | nritems = btrfs_header_nritems(path->nodes[0]); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 2999 | } |
| 3000 | leaf = path->nodes[0]; |
| 3001 | slot = path->slots[0]; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3002 | |
Yan Zheng | ae01a0a | 2008-08-04 23:23:47 -0400 | [diff] [blame] | 3003 | btrfs_item_key_to_cpu(leaf, &key, slot); |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 3004 | if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3005 | key.objectid != btrfs_ino(src)) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3006 | break; |
| 3007 | |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3008 | if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { |
| 3009 | struct btrfs_file_extent_item *extent; |
| 3010 | int type; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3011 | u32 size; |
| 3012 | struct btrfs_key new_key; |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3013 | u64 disko = 0, diskl = 0; |
| 3014 | u64 datao = 0, datal = 0; |
| 3015 | u8 comp; |
Sage Weil | b5384d4 | 2010-06-12 22:31:14 +0000 | [diff] [blame] | 3016 | u64 endoff; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3017 | |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3018 | extent = btrfs_item_ptr(leaf, slot, |
| 3019 | struct btrfs_file_extent_item); |
| 3020 | comp = btrfs_file_extent_compression(leaf, extent); |
| 3021 | type = btrfs_file_extent_type(leaf, extent); |
Chris Mason | c8a894d | 2009-06-27 21:07:03 -0400 | [diff] [blame] | 3022 | if (type == BTRFS_FILE_EXTENT_REG || |
| 3023 | type == BTRFS_FILE_EXTENT_PREALLOC) { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3024 | disko = btrfs_file_extent_disk_bytenr(leaf, |
| 3025 | extent); |
| 3026 | diskl = btrfs_file_extent_disk_num_bytes(leaf, |
| 3027 | extent); |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3028 | datao = btrfs_file_extent_offset(leaf, extent); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3029 | datal = btrfs_file_extent_num_bytes(leaf, |
| 3030 | extent); |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3031 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
| 3032 | /* take upper bound, may be compressed */ |
| 3033 | datal = btrfs_file_extent_ram_bytes(leaf, |
| 3034 | extent); |
| 3035 | } |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3036 | |
Sage Weil | 050006a | 2010-10-29 15:37:33 -0400 | [diff] [blame] | 3037 | if (key.offset + datal <= off || |
Filipe David Borba Manana | e4355f3 | 2014-01-13 19:35:01 +0000 | [diff] [blame] | 3038 | key.offset >= off + len - 1) { |
| 3039 | path->slots[0]++; |
| 3040 | goto process_slot; |
| 3041 | } |
| 3042 | |
| 3043 | size = btrfs_item_size_nr(leaf, slot); |
| 3044 | read_extent_buffer(leaf, buf, |
| 3045 | btrfs_item_ptr_offset(leaf, slot), |
| 3046 | size); |
| 3047 | |
| 3048 | btrfs_release_path(path); |
| 3049 | path->leave_spinning = 0; |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3050 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3051 | memcpy(&new_key, &key, sizeof(new_key)); |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3052 | new_key.objectid = btrfs_ino(inode); |
Li Zefan | 4d728ec | 2011-01-26 14:10:43 +0800 | [diff] [blame] | 3053 | if (off <= key.offset) |
| 3054 | new_key.offset = key.offset + destoff - off; |
| 3055 | else |
| 3056 | new_key.offset = destoff; |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3057 | |
Sage Weil | b6f3409 | 2011-09-20 14:48:51 -0400 | [diff] [blame] | 3058 | /* |
| 3059 | * 1 - adjusting old extent (we may have to split it) |
| 3060 | * 1 - add new extent |
| 3061 | * 1 - inode update |
| 3062 | */ |
| 3063 | trans = btrfs_start_transaction(root, 3); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3064 | if (IS_ERR(trans)) { |
| 3065 | ret = PTR_ERR(trans); |
| 3066 | goto out; |
| 3067 | } |
| 3068 | |
Chris Mason | c8a894d | 2009-06-27 21:07:03 -0400 | [diff] [blame] | 3069 | if (type == BTRFS_FILE_EXTENT_REG || |
| 3070 | type == BTRFS_FILE_EXTENT_PREALLOC) { |
Li Zefan | d72c084 | 2011-09-11 10:52:25 -0400 | [diff] [blame] | 3071 | /* |
| 3072 | * a | --- range to clone ---| b |
| 3073 | * | ------------- extent ------------- | |
| 3074 | */ |
| 3075 | |
| 3076 | /* substract range b */ |
| 3077 | if (key.offset + datal > off + len) |
| 3078 | datal = off + len - key.offset; |
| 3079 | |
| 3080 | /* substract range a */ |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3081 | if (off > key.offset) { |
| 3082 | datao += off - key.offset; |
| 3083 | datal -= off - key.offset; |
| 3084 | } |
| 3085 | |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 3086 | ret = btrfs_drop_extents(trans, root, inode, |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3087 | new_key.offset, |
| 3088 | new_key.offset + datal, |
Josef Bacik | 2671485 | 2012-08-29 12:24:27 -0400 | [diff] [blame] | 3089 | 1); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3090 | if (ret) { |
David Sterba | 3f9e3df | 2014-04-15 18:50:17 +0200 | [diff] [blame^] | 3091 | if (ret != -EOPNOTSUPP) |
Liu Bo | 00fdf13 | 2014-03-10 18:56:07 +0800 | [diff] [blame] | 3092 | btrfs_abort_transaction(trans, |
| 3093 | root, ret); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3094 | btrfs_end_transaction(trans, root); |
| 3095 | goto out; |
| 3096 | } |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3097 | |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3098 | ret = btrfs_insert_empty_item(trans, root, path, |
| 3099 | &new_key, size); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3100 | if (ret) { |
| 3101 | btrfs_abort_transaction(trans, root, |
| 3102 | ret); |
| 3103 | btrfs_end_transaction(trans, root); |
| 3104 | goto out; |
| 3105 | } |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3106 | |
| 3107 | leaf = path->nodes[0]; |
| 3108 | slot = path->slots[0]; |
| 3109 | write_extent_buffer(leaf, buf, |
| 3110 | btrfs_item_ptr_offset(leaf, slot), |
| 3111 | size); |
| 3112 | |
| 3113 | extent = btrfs_item_ptr(leaf, slot, |
| 3114 | struct btrfs_file_extent_item); |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3115 | |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3116 | /* disko == 0 means it's a hole */ |
| 3117 | if (!disko) |
| 3118 | datao = 0; |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3119 | |
| 3120 | btrfs_set_file_extent_offset(leaf, extent, |
| 3121 | datao); |
| 3122 | btrfs_set_file_extent_num_bytes(leaf, extent, |
| 3123 | datal); |
| 3124 | if (disko) { |
| 3125 | inode_add_bytes(inode, datal); |
| 3126 | ret = btrfs_inc_extent_ref(trans, root, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3127 | disko, diskl, 0, |
| 3128 | root->root_key.objectid, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3129 | btrfs_ino(inode), |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 3130 | new_key.offset - datao, |
| 3131 | 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3132 | if (ret) { |
| 3133 | btrfs_abort_transaction(trans, |
| 3134 | root, |
| 3135 | ret); |
| 3136 | btrfs_end_transaction(trans, |
| 3137 | root); |
| 3138 | goto out; |
| 3139 | |
| 3140 | } |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3141 | } |
| 3142 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
| 3143 | u64 skip = 0; |
| 3144 | u64 trim = 0; |
| 3145 | if (off > key.offset) { |
| 3146 | skip = off - key.offset; |
| 3147 | new_key.offset += skip; |
| 3148 | } |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3149 | |
Liu Bo | aa42ffd | 2012-09-18 03:52:23 -0600 | [diff] [blame] | 3150 | if (key.offset + datal > off + len) |
| 3151 | trim = key.offset + datal - (off + len); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3152 | |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3153 | if (comp && (skip || trim)) { |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3154 | ret = -EINVAL; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3155 | btrfs_end_transaction(trans, root); |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3156 | goto out; |
| 3157 | } |
| 3158 | size -= skip + trim; |
| 3159 | datal -= skip + trim; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3160 | |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 3161 | ret = btrfs_drop_extents(trans, root, inode, |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3162 | new_key.offset, |
| 3163 | new_key.offset + datal, |
Josef Bacik | 2671485 | 2012-08-29 12:24:27 -0400 | [diff] [blame] | 3164 | 1); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3165 | if (ret) { |
David Sterba | 3f9e3df | 2014-04-15 18:50:17 +0200 | [diff] [blame^] | 3166 | if (ret != -EOPNOTSUPP) |
Chris Mason | 3a29bc0 | 2014-04-07 07:10:40 -0700 | [diff] [blame] | 3167 | btrfs_abort_transaction(trans, |
| 3168 | root, ret); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3169 | btrfs_end_transaction(trans, root); |
| 3170 | goto out; |
| 3171 | } |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3172 | |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3173 | ret = btrfs_insert_empty_item(trans, root, path, |
| 3174 | &new_key, size); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3175 | if (ret) { |
| 3176 | btrfs_abort_transaction(trans, root, |
| 3177 | ret); |
| 3178 | btrfs_end_transaction(trans, root); |
| 3179 | goto out; |
| 3180 | } |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3181 | |
| 3182 | if (skip) { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3183 | u32 start = |
| 3184 | btrfs_file_extent_calc_inline_size(0); |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3185 | memmove(buf+start, buf+start+skip, |
| 3186 | datal); |
| 3187 | } |
| 3188 | |
| 3189 | leaf = path->nodes[0]; |
| 3190 | slot = path->slots[0]; |
| 3191 | write_extent_buffer(leaf, buf, |
| 3192 | btrfs_item_ptr_offset(leaf, slot), |
| 3193 | size); |
| 3194 | inode_add_bytes(inode, datal); |
| 3195 | } |
| 3196 | |
| 3197 | btrfs_mark_buffer_dirty(leaf); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3198 | btrfs_release_path(path); |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3199 | |
Josef Bacik | 0c4d2d9 | 2012-04-05 15:03:02 -0400 | [diff] [blame] | 3200 | inode_inc_iversion(inode); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3201 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
Sage Weil | b5384d4 | 2010-06-12 22:31:14 +0000 | [diff] [blame] | 3202 | |
| 3203 | /* |
| 3204 | * we round up to the block size at eof when |
| 3205 | * determining which extents to clone above, |
| 3206 | * but shouldn't round up the file size |
| 3207 | */ |
| 3208 | endoff = new_key.offset + datal; |
Li Zefan | 5f3888f | 2010-11-19 01:36:34 +0000 | [diff] [blame] | 3209 | if (endoff > destoff+olen) |
| 3210 | endoff = destoff+olen; |
Sage Weil | b5384d4 | 2010-06-12 22:31:14 +0000 | [diff] [blame] | 3211 | if (endoff > inode->i_size) |
| 3212 | btrfs_i_size_write(inode, endoff); |
| 3213 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3214 | ret = btrfs_update_inode(trans, root, inode); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3215 | if (ret) { |
| 3216 | btrfs_abort_transaction(trans, root, ret); |
| 3217 | btrfs_end_transaction(trans, root); |
| 3218 | goto out; |
| 3219 | } |
| 3220 | ret = btrfs_end_transaction(trans, root); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3221 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3222 | btrfs_release_path(path); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3223 | key.offset++; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3224 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3225 | ret = 0; |
Mark Fasheh | 32b7c68 | 2013-08-06 11:42:49 -0700 | [diff] [blame] | 3226 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3227 | out: |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3228 | btrfs_release_path(path); |
Mark Fasheh | 32b7c68 | 2013-08-06 11:42:49 -0700 | [diff] [blame] | 3229 | btrfs_free_path(path); |
| 3230 | vfree(buf); |
| 3231 | return ret; |
| 3232 | } |
| 3233 | |
| 3234 | static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, |
| 3235 | u64 off, u64 olen, u64 destoff) |
| 3236 | { |
Al Viro | 54563d4 | 2013-09-01 15:57:51 -0400 | [diff] [blame] | 3237 | struct inode *inode = file_inode(file); |
Mark Fasheh | 32b7c68 | 2013-08-06 11:42:49 -0700 | [diff] [blame] | 3238 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 3239 | struct fd src_file; |
| 3240 | struct inode *src; |
| 3241 | int ret; |
| 3242 | u64 len = olen; |
| 3243 | u64 bs = root->fs_info->sb->s_blocksize; |
| 3244 | int same_inode = 0; |
| 3245 | |
| 3246 | /* |
| 3247 | * TODO: |
| 3248 | * - split compressed inline extents. annoying: we need to |
| 3249 | * decompress into destination's address_space (the file offset |
| 3250 | * may change, so source mapping won't do), then recompress (or |
| 3251 | * otherwise reinsert) a subrange. |
Liu Bo | 00fdf13 | 2014-03-10 18:56:07 +0800 | [diff] [blame] | 3252 | * |
| 3253 | * - split destination inode's inline extents. The inline extents can |
| 3254 | * be either compressed or non-compressed. |
Mark Fasheh | 32b7c68 | 2013-08-06 11:42:49 -0700 | [diff] [blame] | 3255 | */ |
| 3256 | |
| 3257 | /* the destination must be opened for writing */ |
| 3258 | if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) |
| 3259 | return -EINVAL; |
| 3260 | |
| 3261 | if (btrfs_root_readonly(root)) |
| 3262 | return -EROFS; |
| 3263 | |
| 3264 | ret = mnt_want_write_file(file); |
| 3265 | if (ret) |
| 3266 | return ret; |
| 3267 | |
| 3268 | src_file = fdget(srcfd); |
| 3269 | if (!src_file.file) { |
| 3270 | ret = -EBADF; |
| 3271 | goto out_drop_write; |
| 3272 | } |
| 3273 | |
| 3274 | ret = -EXDEV; |
| 3275 | if (src_file.file->f_path.mnt != file->f_path.mnt) |
| 3276 | goto out_fput; |
| 3277 | |
| 3278 | src = file_inode(src_file.file); |
| 3279 | |
| 3280 | ret = -EINVAL; |
| 3281 | if (src == inode) |
| 3282 | same_inode = 1; |
| 3283 | |
| 3284 | /* the src must be open for reading */ |
| 3285 | if (!(src_file.file->f_mode & FMODE_READ)) |
| 3286 | goto out_fput; |
| 3287 | |
| 3288 | /* don't make the dst file partly checksummed */ |
| 3289 | if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != |
| 3290 | (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) |
| 3291 | goto out_fput; |
| 3292 | |
| 3293 | ret = -EISDIR; |
| 3294 | if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) |
| 3295 | goto out_fput; |
| 3296 | |
| 3297 | ret = -EXDEV; |
| 3298 | if (src->i_sb != inode->i_sb) |
| 3299 | goto out_fput; |
| 3300 | |
| 3301 | if (!same_inode) { |
| 3302 | if (inode < src) { |
| 3303 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); |
| 3304 | mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); |
| 3305 | } else { |
| 3306 | mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); |
| 3307 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); |
| 3308 | } |
| 3309 | } else { |
| 3310 | mutex_lock(&src->i_mutex); |
| 3311 | } |
| 3312 | |
| 3313 | /* determine range to clone */ |
| 3314 | ret = -EINVAL; |
| 3315 | if (off + len > src->i_size || off + len < off) |
| 3316 | goto out_unlock; |
| 3317 | if (len == 0) |
| 3318 | olen = len = src->i_size - off; |
| 3319 | /* if we extend to eof, continue to block boundary */ |
| 3320 | if (off + len == src->i_size) |
| 3321 | len = ALIGN(src->i_size, bs) - off; |
| 3322 | |
| 3323 | /* verify the end result is block aligned */ |
| 3324 | if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || |
| 3325 | !IS_ALIGNED(destoff, bs)) |
| 3326 | goto out_unlock; |
| 3327 | |
| 3328 | /* verify if ranges are overlapped within the same file */ |
| 3329 | if (same_inode) { |
| 3330 | if (destoff + len > off && destoff < off + len) |
| 3331 | goto out_unlock; |
| 3332 | } |
| 3333 | |
| 3334 | if (destoff > inode->i_size) { |
| 3335 | ret = btrfs_cont_expand(inode, inode->i_size, destoff); |
| 3336 | if (ret) |
| 3337 | goto out_unlock; |
| 3338 | } |
| 3339 | |
| 3340 | /* truncate page cache pages from target inode range */ |
| 3341 | truncate_inode_pages_range(&inode->i_data, destoff, |
| 3342 | PAGE_CACHE_ALIGN(destoff + len) - 1); |
| 3343 | |
| 3344 | lock_extent_range(src, off, len); |
| 3345 | |
| 3346 | ret = btrfs_clone(src, inode, off, olen, len, destoff); |
| 3347 | |
Liu Bo | aa42ffd | 2012-09-18 03:52:23 -0600 | [diff] [blame] | 3348 | unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3349 | out_unlock: |
Filipe David Borba Manana | c57c2b3 | 2014-01-11 21:31:25 +0000 | [diff] [blame] | 3350 | if (!same_inode) { |
| 3351 | if (inode < src) { |
| 3352 | mutex_unlock(&src->i_mutex); |
| 3353 | mutex_unlock(&inode->i_mutex); |
| 3354 | } else { |
| 3355 | mutex_unlock(&inode->i_mutex); |
| 3356 | mutex_unlock(&src->i_mutex); |
| 3357 | } |
| 3358 | } else { |
| 3359 | mutex_unlock(&src->i_mutex); |
| 3360 | } |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3361 | out_fput: |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 3362 | fdput(src_file); |
Yan Zheng | ab67b7c | 2008-12-19 10:58:39 -0500 | [diff] [blame] | 3363 | out_drop_write: |
Al Viro | 2a79f17 | 2011-12-09 08:06:57 -0500 | [diff] [blame] | 3364 | mnt_drop_write_file(file); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3365 | return ret; |
| 3366 | } |
| 3367 | |
Christoph Hellwig | 7a865e8 | 2008-12-02 09:52:24 -0500 | [diff] [blame] | 3368 | static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3369 | { |
| 3370 | struct btrfs_ioctl_clone_range_args args; |
| 3371 | |
Christoph Hellwig | 7a865e8 | 2008-12-02 09:52:24 -0500 | [diff] [blame] | 3372 | if (copy_from_user(&args, argp, sizeof(args))) |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 3373 | return -EFAULT; |
| 3374 | return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, |
| 3375 | args.src_length, args.dest_offset); |
| 3376 | } |
| 3377 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3378 | /* |
| 3379 | * there are many ways the trans_start and trans_end ioctls can lead |
| 3380 | * to deadlocks. They should only be used by applications that |
| 3381 | * basically own the machine, and have a very in depth understanding |
| 3382 | * of all the possible deadlocks and enospc problems. |
| 3383 | */ |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 3384 | static long btrfs_ioctl_trans_start(struct file *file) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3385 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 3386 | struct inode *inode = file_inode(file); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3387 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 3388 | struct btrfs_trans_handle *trans; |
Sage Weil | 1ab86ae | 2009-09-29 18:38:44 -0400 | [diff] [blame] | 3389 | int ret; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3390 | |
Sage Weil | 1ab86ae | 2009-09-29 18:38:44 -0400 | [diff] [blame] | 3391 | ret = -EPERM; |
Christoph Hellwig | df5b552 | 2008-06-11 21:53:58 -0400 | [diff] [blame] | 3392 | if (!capable(CAP_SYS_ADMIN)) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3393 | goto out; |
Sage Weil | 1ab86ae | 2009-09-29 18:38:44 -0400 | [diff] [blame] | 3394 | |
| 3395 | ret = -EINPROGRESS; |
| 3396 | if (file->private_data) |
| 3397 | goto out; |
Sage Weil | 9ca9ee0 | 2008-08-04 10:41:27 -0400 | [diff] [blame] | 3398 | |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 3399 | ret = -EROFS; |
| 3400 | if (btrfs_root_readonly(root)) |
| 3401 | goto out; |
| 3402 | |
Al Viro | a561be7 | 2011-11-23 11:57:51 -0500 | [diff] [blame] | 3403 | ret = mnt_want_write_file(file); |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 3404 | if (ret) |
| 3405 | goto out; |
| 3406 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 3407 | atomic_inc(&root->fs_info->open_ioctl_trans); |
Sage Weil | 9ca9ee0 | 2008-08-04 10:41:27 -0400 | [diff] [blame] | 3408 | |
Sage Weil | 1ab86ae | 2009-09-29 18:38:44 -0400 | [diff] [blame] | 3409 | ret = -ENOMEM; |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 3410 | trans = btrfs_start_ioctl_transaction(root); |
Tsutomu Itoh | abd30bb | 2011-01-24 00:57:10 +0000 | [diff] [blame] | 3411 | if (IS_ERR(trans)) |
Sage Weil | 1ab86ae | 2009-09-29 18:38:44 -0400 | [diff] [blame] | 3412 | goto out_drop; |
| 3413 | |
| 3414 | file->private_data = trans; |
| 3415 | return 0; |
| 3416 | |
| 3417 | out_drop: |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 3418 | atomic_dec(&root->fs_info->open_ioctl_trans); |
Al Viro | 2a79f17 | 2011-12-09 08:06:57 -0500 | [diff] [blame] | 3419 | mnt_drop_write_file(file); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3420 | out: |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3421 | return ret; |
| 3422 | } |
| 3423 | |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 3424 | static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) |
| 3425 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 3426 | struct inode *inode = file_inode(file); |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 3427 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 3428 | struct btrfs_root *new_root; |
| 3429 | struct btrfs_dir_item *di; |
| 3430 | struct btrfs_trans_handle *trans; |
| 3431 | struct btrfs_path *path; |
| 3432 | struct btrfs_key location; |
| 3433 | struct btrfs_disk_key disk_key; |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 3434 | u64 objectid = 0; |
| 3435 | u64 dir_id; |
Miao Xie | 3c04ce0 | 2012-11-26 08:43:07 +0000 | [diff] [blame] | 3436 | int ret; |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 3437 | |
| 3438 | if (!capable(CAP_SYS_ADMIN)) |
| 3439 | return -EPERM; |
| 3440 | |
Miao Xie | 3c04ce0 | 2012-11-26 08:43:07 +0000 | [diff] [blame] | 3441 | ret = mnt_want_write_file(file); |
| 3442 | if (ret) |
| 3443 | return ret; |
| 3444 | |
| 3445 | if (copy_from_user(&objectid, argp, sizeof(objectid))) { |
| 3446 | ret = -EFAULT; |
| 3447 | goto out; |
| 3448 | } |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 3449 | |
| 3450 | if (!objectid) |
chandan | 1cecf57 | 2013-09-13 19:34:10 +0530 | [diff] [blame] | 3451 | objectid = BTRFS_FS_TREE_OBJECTID; |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 3452 | |
| 3453 | location.objectid = objectid; |
| 3454 | location.type = BTRFS_ROOT_ITEM_KEY; |
| 3455 | location.offset = (u64)-1; |
| 3456 | |
| 3457 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); |
Miao Xie | 3c04ce0 | 2012-11-26 08:43:07 +0000 | [diff] [blame] | 3458 | if (IS_ERR(new_root)) { |
| 3459 | ret = PTR_ERR(new_root); |
| 3460 | goto out; |
| 3461 | } |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 3462 | |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 3463 | path = btrfs_alloc_path(); |
Miao Xie | 3c04ce0 | 2012-11-26 08:43:07 +0000 | [diff] [blame] | 3464 | if (!path) { |
| 3465 | ret = -ENOMEM; |
| 3466 | goto out; |
| 3467 | } |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 3468 | path->leave_spinning = 1; |
| 3469 | |
| 3470 | trans = btrfs_start_transaction(root, 1); |
Tsutomu Itoh | 98d5dc1 | 2011-01-20 06:19:37 +0000 | [diff] [blame] | 3471 | if (IS_ERR(trans)) { |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 3472 | btrfs_free_path(path); |
Miao Xie | 3c04ce0 | 2012-11-26 08:43:07 +0000 | [diff] [blame] | 3473 | ret = PTR_ERR(trans); |
| 3474 | goto out; |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 3475 | } |
| 3476 | |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 3477 | dir_id = btrfs_super_root_dir(root->fs_info->super_copy); |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 3478 | di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, |
| 3479 | dir_id, "default", 7, 1); |
Dan Carpenter | cf1e99a | 2010-05-29 09:47:24 +0000 | [diff] [blame] | 3480 | if (IS_ERR_OR_NULL(di)) { |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 3481 | btrfs_free_path(path); |
| 3482 | btrfs_end_transaction(trans, root); |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 3483 | btrfs_err(new_root->fs_info, "Umm, you don't have the default dir" |
| 3484 | "item, this isn't going to work"); |
Miao Xie | 3c04ce0 | 2012-11-26 08:43:07 +0000 | [diff] [blame] | 3485 | ret = -ENOENT; |
| 3486 | goto out; |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 3487 | } |
| 3488 | |
| 3489 | btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); |
| 3490 | btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); |
| 3491 | btrfs_mark_buffer_dirty(path->nodes[0]); |
| 3492 | btrfs_free_path(path); |
| 3493 | |
Mitch Harder | 2b0ce2c | 2012-07-24 11:58:43 -0600 | [diff] [blame] | 3494 | btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL); |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 3495 | btrfs_end_transaction(trans, root); |
Miao Xie | 3c04ce0 | 2012-11-26 08:43:07 +0000 | [diff] [blame] | 3496 | out: |
| 3497 | mnt_drop_write_file(file); |
| 3498 | return ret; |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 3499 | } |
| 3500 | |
Stefan Behrens | 5af3e8c | 2012-08-01 18:56:49 +0200 | [diff] [blame] | 3501 | void btrfs_get_block_group_info(struct list_head *groups_list, |
| 3502 | struct btrfs_ioctl_space_info *space) |
Josef Bacik | bf5fc093 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 3503 | { |
| 3504 | struct btrfs_block_group_cache *block_group; |
| 3505 | |
| 3506 | space->total_bytes = 0; |
| 3507 | space->used_bytes = 0; |
| 3508 | space->flags = 0; |
| 3509 | list_for_each_entry(block_group, groups_list, list) { |
| 3510 | space->flags = block_group->flags; |
| 3511 | space->total_bytes += block_group->key.offset; |
| 3512 | space->used_bytes += |
| 3513 | btrfs_block_group_used(&block_group->item); |
| 3514 | } |
| 3515 | } |
| 3516 | |
Eric Sandeen | 48a3b63 | 2013-04-25 20:41:01 +0000 | [diff] [blame] | 3517 | 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] | 3518 | { |
| 3519 | struct btrfs_ioctl_space_args space_args; |
| 3520 | struct btrfs_ioctl_space_info space; |
| 3521 | struct btrfs_ioctl_space_info *dest; |
Chris Mason | 7fde62b | 2010-03-16 15:40:10 -0400 | [diff] [blame] | 3522 | struct btrfs_ioctl_space_info *dest_orig; |
Daniel J Blueman | 13f2696 | 2011-04-11 15:56:31 +0000 | [diff] [blame] | 3523 | struct btrfs_ioctl_space_info __user *user_dest; |
Josef Bacik | 1406e43 | 2010-01-13 18:19:06 +0000 | [diff] [blame] | 3524 | struct btrfs_space_info *info; |
Josef Bacik | bf5fc093 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 3525 | u64 types[] = {BTRFS_BLOCK_GROUP_DATA, |
| 3526 | BTRFS_BLOCK_GROUP_SYSTEM, |
| 3527 | BTRFS_BLOCK_GROUP_METADATA, |
| 3528 | BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; |
| 3529 | int num_types = 4; |
Chris Mason | 7fde62b | 2010-03-16 15:40:10 -0400 | [diff] [blame] | 3530 | int alloc_size; |
Josef Bacik | 1406e43 | 2010-01-13 18:19:06 +0000 | [diff] [blame] | 3531 | int ret = 0; |
Dan Rosenberg | 51788b1 | 2011-02-14 16:04:23 -0500 | [diff] [blame] | 3532 | u64 slot_count = 0; |
Josef Bacik | bf5fc093 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 3533 | int i, c; |
Josef Bacik | 1406e43 | 2010-01-13 18:19:06 +0000 | [diff] [blame] | 3534 | |
| 3535 | if (copy_from_user(&space_args, |
| 3536 | (struct btrfs_ioctl_space_args __user *)arg, |
| 3537 | sizeof(space_args))) |
| 3538 | return -EFAULT; |
| 3539 | |
Josef Bacik | bf5fc093 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 3540 | for (i = 0; i < num_types; i++) { |
| 3541 | struct btrfs_space_info *tmp; |
| 3542 | |
| 3543 | info = NULL; |
| 3544 | rcu_read_lock(); |
| 3545 | list_for_each_entry_rcu(tmp, &root->fs_info->space_info, |
| 3546 | list) { |
| 3547 | if (tmp->flags == types[i]) { |
| 3548 | info = tmp; |
| 3549 | break; |
| 3550 | } |
| 3551 | } |
| 3552 | rcu_read_unlock(); |
| 3553 | |
| 3554 | if (!info) |
| 3555 | continue; |
| 3556 | |
| 3557 | down_read(&info->groups_sem); |
| 3558 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { |
| 3559 | if (!list_empty(&info->block_groups[c])) |
| 3560 | slot_count++; |
| 3561 | } |
| 3562 | up_read(&info->groups_sem); |
| 3563 | } |
Josef Bacik | 1406e43 | 2010-01-13 18:19:06 +0000 | [diff] [blame] | 3564 | |
David Sterba | 36523e95 | 2014-02-07 14:34:12 +0100 | [diff] [blame] | 3565 | /* |
| 3566 | * Global block reserve, exported as a space_info |
| 3567 | */ |
| 3568 | slot_count++; |
| 3569 | |
Chris Mason | 7fde62b | 2010-03-16 15:40:10 -0400 | [diff] [blame] | 3570 | /* space_slots == 0 means they are asking for a count */ |
| 3571 | if (space_args.space_slots == 0) { |
| 3572 | space_args.total_spaces = slot_count; |
| 3573 | goto out; |
| 3574 | } |
Josef Bacik | bf5fc093 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 3575 | |
Dan Rosenberg | 51788b1 | 2011-02-14 16:04:23 -0500 | [diff] [blame] | 3576 | slot_count = min_t(u64, space_args.space_slots, slot_count); |
Josef Bacik | bf5fc093 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 3577 | |
Chris Mason | 7fde62b | 2010-03-16 15:40:10 -0400 | [diff] [blame] | 3578 | alloc_size = sizeof(*dest) * slot_count; |
Josef Bacik | bf5fc093 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 3579 | |
Chris Mason | 7fde62b | 2010-03-16 15:40:10 -0400 | [diff] [blame] | 3580 | /* we generally have at most 6 or so space infos, one for each raid |
| 3581 | * level. So, a whole page should be more than enough for everyone |
| 3582 | */ |
| 3583 | if (alloc_size > PAGE_CACHE_SIZE) |
| 3584 | return -ENOMEM; |
| 3585 | |
| 3586 | space_args.total_spaces = 0; |
| 3587 | dest = kmalloc(alloc_size, GFP_NOFS); |
| 3588 | if (!dest) |
| 3589 | return -ENOMEM; |
| 3590 | dest_orig = dest; |
| 3591 | |
| 3592 | /* now we have a buffer to copy into */ |
Josef Bacik | bf5fc093 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 3593 | for (i = 0; i < num_types; i++) { |
| 3594 | struct btrfs_space_info *tmp; |
Chris Mason | 7fde62b | 2010-03-16 15:40:10 -0400 | [diff] [blame] | 3595 | |
Dan Rosenberg | 51788b1 | 2011-02-14 16:04:23 -0500 | [diff] [blame] | 3596 | if (!slot_count) |
| 3597 | break; |
| 3598 | |
Josef Bacik | bf5fc093 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 3599 | info = NULL; |
| 3600 | rcu_read_lock(); |
| 3601 | list_for_each_entry_rcu(tmp, &root->fs_info->space_info, |
| 3602 | list) { |
| 3603 | if (tmp->flags == types[i]) { |
| 3604 | info = tmp; |
| 3605 | break; |
| 3606 | } |
| 3607 | } |
| 3608 | rcu_read_unlock(); |
Chris Mason | 7fde62b | 2010-03-16 15:40:10 -0400 | [diff] [blame] | 3609 | |
Josef Bacik | bf5fc093 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 3610 | if (!info) |
| 3611 | continue; |
| 3612 | down_read(&info->groups_sem); |
| 3613 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { |
| 3614 | if (!list_empty(&info->block_groups[c])) { |
Stefan Behrens | 5af3e8c | 2012-08-01 18:56:49 +0200 | [diff] [blame] | 3615 | btrfs_get_block_group_info( |
| 3616 | &info->block_groups[c], &space); |
Josef Bacik | bf5fc093 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 3617 | memcpy(dest, &space, sizeof(space)); |
| 3618 | dest++; |
| 3619 | space_args.total_spaces++; |
Dan Rosenberg | 51788b1 | 2011-02-14 16:04:23 -0500 | [diff] [blame] | 3620 | slot_count--; |
Josef Bacik | bf5fc093 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 3621 | } |
Dan Rosenberg | 51788b1 | 2011-02-14 16:04:23 -0500 | [diff] [blame] | 3622 | if (!slot_count) |
| 3623 | break; |
Josef Bacik | bf5fc093 | 2010-09-29 11:22:36 -0400 | [diff] [blame] | 3624 | } |
| 3625 | up_read(&info->groups_sem); |
Josef Bacik | 1406e43 | 2010-01-13 18:19:06 +0000 | [diff] [blame] | 3626 | } |
Josef Bacik | 1406e43 | 2010-01-13 18:19:06 +0000 | [diff] [blame] | 3627 | |
David Sterba | 36523e95 | 2014-02-07 14:34:12 +0100 | [diff] [blame] | 3628 | /* |
| 3629 | * Add global block reserve |
| 3630 | */ |
| 3631 | if (slot_count) { |
| 3632 | struct btrfs_block_rsv *block_rsv = &root->fs_info->global_block_rsv; |
| 3633 | |
| 3634 | spin_lock(&block_rsv->lock); |
| 3635 | space.total_bytes = block_rsv->size; |
| 3636 | space.used_bytes = block_rsv->size - block_rsv->reserved; |
| 3637 | spin_unlock(&block_rsv->lock); |
| 3638 | space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; |
| 3639 | memcpy(dest, &space, sizeof(space)); |
| 3640 | space_args.total_spaces++; |
| 3641 | } |
| 3642 | |
Daniel J Blueman | 2eec6c8 | 2012-04-26 00:37:14 +0800 | [diff] [blame] | 3643 | user_dest = (struct btrfs_ioctl_space_info __user *) |
Chris Mason | 7fde62b | 2010-03-16 15:40:10 -0400 | [diff] [blame] | 3644 | (arg + sizeof(struct btrfs_ioctl_space_args)); |
| 3645 | |
| 3646 | if (copy_to_user(user_dest, dest_orig, alloc_size)) |
| 3647 | ret = -EFAULT; |
| 3648 | |
| 3649 | kfree(dest_orig); |
| 3650 | out: |
| 3651 | if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) |
Josef Bacik | 1406e43 | 2010-01-13 18:19:06 +0000 | [diff] [blame] | 3652 | ret = -EFAULT; |
| 3653 | |
| 3654 | return ret; |
| 3655 | } |
| 3656 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3657 | /* |
| 3658 | * there are many ways the trans_start and trans_end ioctls can lead |
| 3659 | * to deadlocks. They should only be used by applications that |
| 3660 | * basically own the machine, and have a very in depth understanding |
| 3661 | * of all the possible deadlocks and enospc problems. |
| 3662 | */ |
| 3663 | long btrfs_ioctl_trans_end(struct file *file) |
| 3664 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 3665 | struct inode *inode = file_inode(file); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3666 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 3667 | struct btrfs_trans_handle *trans; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3668 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3669 | trans = file->private_data; |
Sage Weil | 1ab86ae | 2009-09-29 18:38:44 -0400 | [diff] [blame] | 3670 | if (!trans) |
| 3671 | return -EINVAL; |
Christoph Hellwig | b214107 | 2008-09-05 16:43:31 -0400 | [diff] [blame] | 3672 | file->private_data = NULL; |
Sage Weil | 9ca9ee0 | 2008-08-04 10:41:27 -0400 | [diff] [blame] | 3673 | |
Sage Weil | 1ab86ae | 2009-09-29 18:38:44 -0400 | [diff] [blame] | 3674 | btrfs_end_transaction(trans, root); |
| 3675 | |
Josef Bacik | a4abeea | 2011-04-11 17:25:13 -0400 | [diff] [blame] | 3676 | atomic_dec(&root->fs_info->open_ioctl_trans); |
Sage Weil | 9ca9ee0 | 2008-08-04 10:41:27 -0400 | [diff] [blame] | 3677 | |
Al Viro | 2a79f17 | 2011-12-09 08:06:57 -0500 | [diff] [blame] | 3678 | mnt_drop_write_file(file); |
Sage Weil | 1ab86ae | 2009-09-29 18:38:44 -0400 | [diff] [blame] | 3679 | return 0; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 3680 | } |
| 3681 | |
Miao Xie | 9a8c28b | 2012-11-26 08:40:43 +0000 | [diff] [blame] | 3682 | static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, |
| 3683 | void __user *argp) |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 3684 | { |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 3685 | struct btrfs_trans_handle *trans; |
| 3686 | u64 transid; |
Tsutomu Itoh | db5b493 | 2011-03-23 08:14:16 +0000 | [diff] [blame] | 3687 | int ret; |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 3688 | |
Miao Xie | d4edf39 | 2013-02-20 09:17:06 +0000 | [diff] [blame] | 3689 | trans = btrfs_attach_transaction_barrier(root); |
Miao Xie | ff7c1d3 | 2012-11-26 08:41:29 +0000 | [diff] [blame] | 3690 | if (IS_ERR(trans)) { |
| 3691 | if (PTR_ERR(trans) != -ENOENT) |
| 3692 | return PTR_ERR(trans); |
| 3693 | |
| 3694 | /* No running transaction, don't bother */ |
| 3695 | transid = root->fs_info->last_trans_committed; |
| 3696 | goto out; |
| 3697 | } |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 3698 | transid = trans->transid; |
Tsutomu Itoh | db5b493 | 2011-03-23 08:14:16 +0000 | [diff] [blame] | 3699 | ret = btrfs_commit_transaction_async(trans, root, 0); |
Tsutomu Itoh | 8b2b2d3 | 2011-04-04 01:52:13 +0000 | [diff] [blame] | 3700 | if (ret) { |
| 3701 | btrfs_end_transaction(trans, root); |
Tsutomu Itoh | db5b493 | 2011-03-23 08:14:16 +0000 | [diff] [blame] | 3702 | return ret; |
Tsutomu Itoh | 8b2b2d3 | 2011-04-04 01:52:13 +0000 | [diff] [blame] | 3703 | } |
Miao Xie | ff7c1d3 | 2012-11-26 08:41:29 +0000 | [diff] [blame] | 3704 | out: |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 3705 | if (argp) |
| 3706 | if (copy_to_user(argp, &transid, sizeof(transid))) |
| 3707 | return -EFAULT; |
| 3708 | return 0; |
| 3709 | } |
| 3710 | |
Miao Xie | 9a8c28b | 2012-11-26 08:40:43 +0000 | [diff] [blame] | 3711 | static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root, |
| 3712 | void __user *argp) |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 3713 | { |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 3714 | u64 transid; |
| 3715 | |
| 3716 | if (argp) { |
| 3717 | if (copy_from_user(&transid, argp, sizeof(transid))) |
| 3718 | return -EFAULT; |
| 3719 | } else { |
| 3720 | transid = 0; /* current trans */ |
| 3721 | } |
| 3722 | return btrfs_wait_for_commit(root, transid); |
| 3723 | } |
| 3724 | |
Miao Xie | b8e9548 | 2012-11-26 08:48:01 +0000 | [diff] [blame] | 3725 | static long btrfs_ioctl_scrub(struct file *file, void __user *arg) |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 3726 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 3727 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 3728 | struct btrfs_ioctl_scrub_args *sa; |
Miao Xie | b8e9548 | 2012-11-26 08:48:01 +0000 | [diff] [blame] | 3729 | int ret; |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 3730 | |
| 3731 | if (!capable(CAP_SYS_ADMIN)) |
| 3732 | return -EPERM; |
| 3733 | |
| 3734 | sa = memdup_user(arg, sizeof(*sa)); |
| 3735 | if (IS_ERR(sa)) |
| 3736 | return PTR_ERR(sa); |
| 3737 | |
Miao Xie | b8e9548 | 2012-11-26 08:48:01 +0000 | [diff] [blame] | 3738 | if (!(sa->flags & BTRFS_SCRUB_READONLY)) { |
| 3739 | ret = mnt_want_write_file(file); |
| 3740 | if (ret) |
| 3741 | goto out; |
| 3742 | } |
| 3743 | |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 3744 | 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] | 3745 | &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, |
| 3746 | 0); |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 3747 | |
| 3748 | if (copy_to_user(arg, sa, sizeof(*sa))) |
| 3749 | ret = -EFAULT; |
| 3750 | |
Miao Xie | b8e9548 | 2012-11-26 08:48:01 +0000 | [diff] [blame] | 3751 | if (!(sa->flags & BTRFS_SCRUB_READONLY)) |
| 3752 | mnt_drop_write_file(file); |
| 3753 | out: |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 3754 | kfree(sa); |
| 3755 | return ret; |
| 3756 | } |
| 3757 | |
| 3758 | static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) |
| 3759 | { |
| 3760 | if (!capable(CAP_SYS_ADMIN)) |
| 3761 | return -EPERM; |
| 3762 | |
Stefan Behrens | aa1b8cd | 2012-11-05 17:03:39 +0100 | [diff] [blame] | 3763 | return btrfs_scrub_cancel(root->fs_info); |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 3764 | } |
| 3765 | |
| 3766 | static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, |
| 3767 | void __user *arg) |
| 3768 | { |
| 3769 | struct btrfs_ioctl_scrub_args *sa; |
| 3770 | int ret; |
| 3771 | |
| 3772 | if (!capable(CAP_SYS_ADMIN)) |
| 3773 | return -EPERM; |
| 3774 | |
| 3775 | sa = memdup_user(arg, sizeof(*sa)); |
| 3776 | if (IS_ERR(sa)) |
| 3777 | return PTR_ERR(sa); |
| 3778 | |
| 3779 | ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); |
| 3780 | |
| 3781 | if (copy_to_user(arg, sa, sizeof(*sa))) |
| 3782 | ret = -EFAULT; |
| 3783 | |
| 3784 | kfree(sa); |
| 3785 | return ret; |
| 3786 | } |
| 3787 | |
Stefan Behrens | c11d2c2 | 2012-05-25 16:06:09 +0200 | [diff] [blame] | 3788 | static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root, |
David Sterba | b27f7c0 | 2012-06-22 06:30:39 -0600 | [diff] [blame] | 3789 | void __user *arg) |
Stefan Behrens | c11d2c2 | 2012-05-25 16:06:09 +0200 | [diff] [blame] | 3790 | { |
| 3791 | struct btrfs_ioctl_get_dev_stats *sa; |
| 3792 | int ret; |
| 3793 | |
Stefan Behrens | c11d2c2 | 2012-05-25 16:06:09 +0200 | [diff] [blame] | 3794 | sa = memdup_user(arg, sizeof(*sa)); |
| 3795 | if (IS_ERR(sa)) |
| 3796 | return PTR_ERR(sa); |
| 3797 | |
David Sterba | b27f7c0 | 2012-06-22 06:30:39 -0600 | [diff] [blame] | 3798 | if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { |
| 3799 | kfree(sa); |
| 3800 | return -EPERM; |
| 3801 | } |
| 3802 | |
| 3803 | ret = btrfs_get_dev_stats(root, sa); |
Stefan Behrens | c11d2c2 | 2012-05-25 16:06:09 +0200 | [diff] [blame] | 3804 | |
| 3805 | if (copy_to_user(arg, sa, sizeof(*sa))) |
| 3806 | ret = -EFAULT; |
| 3807 | |
| 3808 | kfree(sa); |
| 3809 | return ret; |
| 3810 | } |
| 3811 | |
Stefan Behrens | 3f6bcfb | 2012-11-06 15:08:53 +0100 | [diff] [blame] | 3812 | static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg) |
| 3813 | { |
| 3814 | struct btrfs_ioctl_dev_replace_args *p; |
| 3815 | int ret; |
| 3816 | |
| 3817 | if (!capable(CAP_SYS_ADMIN)) |
| 3818 | return -EPERM; |
| 3819 | |
| 3820 | p = memdup_user(arg, sizeof(*p)); |
| 3821 | if (IS_ERR(p)) |
| 3822 | return PTR_ERR(p); |
| 3823 | |
| 3824 | switch (p->cmd) { |
| 3825 | case BTRFS_IOCTL_DEV_REPLACE_CMD_START: |
Ilya Dryomov | adfa97c | 2013-10-10 20:39:28 +0300 | [diff] [blame] | 3826 | if (root->fs_info->sb->s_flags & MS_RDONLY) { |
| 3827 | ret = -EROFS; |
| 3828 | goto out; |
| 3829 | } |
Stefan Behrens | 3f6bcfb | 2012-11-06 15:08:53 +0100 | [diff] [blame] | 3830 | if (atomic_xchg( |
| 3831 | &root->fs_info->mutually_exclusive_operation_running, |
| 3832 | 1)) { |
Anand Jain | e57138b | 2013-08-21 11:44:48 +0800 | [diff] [blame] | 3833 | ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
Stefan Behrens | 3f6bcfb | 2012-11-06 15:08:53 +0100 | [diff] [blame] | 3834 | } else { |
| 3835 | ret = btrfs_dev_replace_start(root, p); |
| 3836 | atomic_set( |
| 3837 | &root->fs_info->mutually_exclusive_operation_running, |
| 3838 | 0); |
| 3839 | } |
| 3840 | break; |
| 3841 | case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: |
| 3842 | btrfs_dev_replace_status(root->fs_info, p); |
| 3843 | ret = 0; |
| 3844 | break; |
| 3845 | case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: |
| 3846 | ret = btrfs_dev_replace_cancel(root->fs_info, p); |
| 3847 | break; |
| 3848 | default: |
| 3849 | ret = -EINVAL; |
| 3850 | break; |
| 3851 | } |
| 3852 | |
| 3853 | if (copy_to_user(arg, p, sizeof(*p))) |
| 3854 | ret = -EFAULT; |
Ilya Dryomov | adfa97c | 2013-10-10 20:39:28 +0300 | [diff] [blame] | 3855 | out: |
Stefan Behrens | 3f6bcfb | 2012-11-06 15:08:53 +0100 | [diff] [blame] | 3856 | kfree(p); |
| 3857 | return ret; |
| 3858 | } |
| 3859 | |
Jan Schmidt | d7728c9 | 2011-07-07 16:48:38 +0200 | [diff] [blame] | 3860 | static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) |
| 3861 | { |
| 3862 | int ret = 0; |
| 3863 | int i; |
Chris Mason | 740c3d2 | 2011-11-02 15:48:34 -0400 | [diff] [blame] | 3864 | u64 rel_ptr; |
Jan Schmidt | d7728c9 | 2011-07-07 16:48:38 +0200 | [diff] [blame] | 3865 | int size; |
Chris Mason | 806468f | 2011-11-06 03:07:10 -0500 | [diff] [blame] | 3866 | struct btrfs_ioctl_ino_path_args *ipa = NULL; |
Jan Schmidt | d7728c9 | 2011-07-07 16:48:38 +0200 | [diff] [blame] | 3867 | struct inode_fs_paths *ipath = NULL; |
| 3868 | struct btrfs_path *path; |
| 3869 | |
Kusanagi Kouichi | 82b22ac | 2013-01-28 11:33:31 +0000 | [diff] [blame] | 3870 | if (!capable(CAP_DAC_READ_SEARCH)) |
Jan Schmidt | d7728c9 | 2011-07-07 16:48:38 +0200 | [diff] [blame] | 3871 | return -EPERM; |
| 3872 | |
| 3873 | path = btrfs_alloc_path(); |
| 3874 | if (!path) { |
| 3875 | ret = -ENOMEM; |
| 3876 | goto out; |
| 3877 | } |
| 3878 | |
| 3879 | ipa = memdup_user(arg, sizeof(*ipa)); |
| 3880 | if (IS_ERR(ipa)) { |
| 3881 | ret = PTR_ERR(ipa); |
| 3882 | ipa = NULL; |
| 3883 | goto out; |
| 3884 | } |
| 3885 | |
| 3886 | size = min_t(u32, ipa->size, 4096); |
| 3887 | ipath = init_ipath(size, root, path); |
| 3888 | if (IS_ERR(ipath)) { |
| 3889 | ret = PTR_ERR(ipath); |
| 3890 | ipath = NULL; |
| 3891 | goto out; |
| 3892 | } |
| 3893 | |
| 3894 | ret = paths_from_inode(ipa->inum, ipath); |
| 3895 | if (ret < 0) |
| 3896 | goto out; |
| 3897 | |
| 3898 | for (i = 0; i < ipath->fspath->elem_cnt; ++i) { |
Jeff Mahoney | 745c4d8 | 2011-11-20 07:31:57 -0500 | [diff] [blame] | 3899 | rel_ptr = ipath->fspath->val[i] - |
| 3900 | (u64)(unsigned long)ipath->fspath->val; |
Chris Mason | 740c3d2 | 2011-11-02 15:48:34 -0400 | [diff] [blame] | 3901 | ipath->fspath->val[i] = rel_ptr; |
Jan Schmidt | d7728c9 | 2011-07-07 16:48:38 +0200 | [diff] [blame] | 3902 | } |
| 3903 | |
Jeff Mahoney | 745c4d8 | 2011-11-20 07:31:57 -0500 | [diff] [blame] | 3904 | ret = copy_to_user((void *)(unsigned long)ipa->fspath, |
| 3905 | (void *)(unsigned long)ipath->fspath, size); |
Jan Schmidt | d7728c9 | 2011-07-07 16:48:38 +0200 | [diff] [blame] | 3906 | if (ret) { |
| 3907 | ret = -EFAULT; |
| 3908 | goto out; |
| 3909 | } |
| 3910 | |
| 3911 | out: |
| 3912 | btrfs_free_path(path); |
| 3913 | free_ipath(ipath); |
| 3914 | kfree(ipa); |
| 3915 | |
| 3916 | return ret; |
| 3917 | } |
| 3918 | |
| 3919 | static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) |
| 3920 | { |
| 3921 | struct btrfs_data_container *inodes = ctx; |
| 3922 | const size_t c = 3 * sizeof(u64); |
| 3923 | |
| 3924 | if (inodes->bytes_left >= c) { |
| 3925 | inodes->bytes_left -= c; |
| 3926 | inodes->val[inodes->elem_cnt] = inum; |
| 3927 | inodes->val[inodes->elem_cnt + 1] = offset; |
| 3928 | inodes->val[inodes->elem_cnt + 2] = root; |
| 3929 | inodes->elem_cnt += 3; |
| 3930 | } else { |
| 3931 | inodes->bytes_missing += c - inodes->bytes_left; |
| 3932 | inodes->bytes_left = 0; |
| 3933 | inodes->elem_missed += 3; |
| 3934 | } |
| 3935 | |
| 3936 | return 0; |
| 3937 | } |
| 3938 | |
| 3939 | static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root, |
| 3940 | void __user *arg) |
| 3941 | { |
| 3942 | int ret = 0; |
| 3943 | int size; |
Jan Schmidt | d7728c9 | 2011-07-07 16:48:38 +0200 | [diff] [blame] | 3944 | struct btrfs_ioctl_logical_ino_args *loi; |
| 3945 | struct btrfs_data_container *inodes = NULL; |
| 3946 | struct btrfs_path *path = NULL; |
Jan Schmidt | d7728c9 | 2011-07-07 16:48:38 +0200 | [diff] [blame] | 3947 | |
| 3948 | if (!capable(CAP_SYS_ADMIN)) |
| 3949 | return -EPERM; |
| 3950 | |
| 3951 | loi = memdup_user(arg, sizeof(*loi)); |
| 3952 | if (IS_ERR(loi)) { |
| 3953 | ret = PTR_ERR(loi); |
| 3954 | loi = NULL; |
| 3955 | goto out; |
| 3956 | } |
| 3957 | |
| 3958 | path = btrfs_alloc_path(); |
| 3959 | if (!path) { |
| 3960 | ret = -ENOMEM; |
| 3961 | goto out; |
| 3962 | } |
| 3963 | |
Liu Bo | 425d17a | 2012-09-07 20:01:30 -0600 | [diff] [blame] | 3964 | size = min_t(u32, loi->size, 64 * 1024); |
Jan Schmidt | d7728c9 | 2011-07-07 16:48:38 +0200 | [diff] [blame] | 3965 | inodes = init_data_container(size); |
| 3966 | if (IS_ERR(inodes)) { |
| 3967 | ret = PTR_ERR(inodes); |
| 3968 | inodes = NULL; |
| 3969 | goto out; |
| 3970 | } |
| 3971 | |
Liu Bo | df031f0 | 2012-09-07 20:01:29 -0600 | [diff] [blame] | 3972 | ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path, |
| 3973 | build_ino_list, inodes); |
| 3974 | if (ret == -EINVAL) |
Jan Schmidt | d7728c9 | 2011-07-07 16:48:38 +0200 | [diff] [blame] | 3975 | ret = -ENOENT; |
| 3976 | if (ret < 0) |
| 3977 | goto out; |
| 3978 | |
Jeff Mahoney | 745c4d8 | 2011-11-20 07:31:57 -0500 | [diff] [blame] | 3979 | ret = copy_to_user((void *)(unsigned long)loi->inodes, |
| 3980 | (void *)(unsigned long)inodes, size); |
Jan Schmidt | d7728c9 | 2011-07-07 16:48:38 +0200 | [diff] [blame] | 3981 | if (ret) |
| 3982 | ret = -EFAULT; |
| 3983 | |
| 3984 | out: |
| 3985 | btrfs_free_path(path); |
Liu Bo | 425d17a | 2012-09-07 20:01:30 -0600 | [diff] [blame] | 3986 | vfree(inodes); |
Jan Schmidt | d7728c9 | 2011-07-07 16:48:38 +0200 | [diff] [blame] | 3987 | kfree(loi); |
| 3988 | |
| 3989 | return ret; |
| 3990 | } |
| 3991 | |
Ilya Dryomov | 19a39dc | 2012-01-16 22:04:49 +0200 | [diff] [blame] | 3992 | 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] | 3993 | struct btrfs_ioctl_balance_args *bargs) |
| 3994 | { |
| 3995 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; |
| 3996 | |
| 3997 | bargs->flags = bctl->flags; |
| 3998 | |
Ilya Dryomov | 837d5b6 | 2012-01-16 22:04:49 +0200 | [diff] [blame] | 3999 | if (atomic_read(&fs_info->balance_running)) |
| 4000 | bargs->state |= BTRFS_BALANCE_STATE_RUNNING; |
| 4001 | if (atomic_read(&fs_info->balance_pause_req)) |
| 4002 | bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; |
Ilya Dryomov | a7e99c6 | 2012-01-16 22:04:49 +0200 | [diff] [blame] | 4003 | if (atomic_read(&fs_info->balance_cancel_req)) |
| 4004 | bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; |
Ilya Dryomov | 837d5b6 | 2012-01-16 22:04:49 +0200 | [diff] [blame] | 4005 | |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4006 | memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); |
| 4007 | memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); |
| 4008 | memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); |
Ilya Dryomov | 19a39dc | 2012-01-16 22:04:49 +0200 | [diff] [blame] | 4009 | |
| 4010 | if (lock) { |
| 4011 | spin_lock(&fs_info->balance_lock); |
| 4012 | memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); |
| 4013 | spin_unlock(&fs_info->balance_lock); |
| 4014 | } else { |
| 4015 | memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); |
| 4016 | } |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4017 | } |
| 4018 | |
Liu Bo | 9ba1f6e | 2012-05-11 18:11:26 +0800 | [diff] [blame] | 4019 | static long btrfs_ioctl_balance(struct file *file, void __user *arg) |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4020 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 4021 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4022 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 4023 | struct btrfs_ioctl_balance_args *bargs; |
| 4024 | struct btrfs_balance_control *bctl; |
Ilya Dryomov | ed0fb78 | 2013-01-20 15:57:57 +0200 | [diff] [blame] | 4025 | bool need_unlock; /* for mut. excl. ops lock */ |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4026 | int ret; |
| 4027 | |
| 4028 | if (!capable(CAP_SYS_ADMIN)) |
| 4029 | return -EPERM; |
| 4030 | |
Liu Bo | e54bfa3 | 2012-06-29 03:58:48 -0600 | [diff] [blame] | 4031 | ret = mnt_want_write_file(file); |
Liu Bo | 9ba1f6e | 2012-05-11 18:11:26 +0800 | [diff] [blame] | 4032 | if (ret) |
| 4033 | return ret; |
| 4034 | |
Ilya Dryomov | ed0fb78 | 2013-01-20 15:57:57 +0200 | [diff] [blame] | 4035 | again: |
| 4036 | if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) { |
| 4037 | mutex_lock(&fs_info->volume_mutex); |
| 4038 | mutex_lock(&fs_info->balance_mutex); |
| 4039 | need_unlock = true; |
| 4040 | goto locked; |
| 4041 | } |
| 4042 | |
| 4043 | /* |
| 4044 | * mut. excl. ops lock is locked. Three possibilites: |
| 4045 | * (1) some other op is running |
| 4046 | * (2) balance is running |
| 4047 | * (3) balance is paused -- special case (think resume) |
| 4048 | */ |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4049 | mutex_lock(&fs_info->balance_mutex); |
Ilya Dryomov | ed0fb78 | 2013-01-20 15:57:57 +0200 | [diff] [blame] | 4050 | if (fs_info->balance_ctl) { |
| 4051 | /* this is either (2) or (3) */ |
| 4052 | if (!atomic_read(&fs_info->balance_running)) { |
| 4053 | mutex_unlock(&fs_info->balance_mutex); |
| 4054 | if (!mutex_trylock(&fs_info->volume_mutex)) |
| 4055 | goto again; |
| 4056 | mutex_lock(&fs_info->balance_mutex); |
| 4057 | |
| 4058 | if (fs_info->balance_ctl && |
| 4059 | !atomic_read(&fs_info->balance_running)) { |
| 4060 | /* this is (3) */ |
| 4061 | need_unlock = false; |
| 4062 | goto locked; |
| 4063 | } |
| 4064 | |
| 4065 | mutex_unlock(&fs_info->balance_mutex); |
| 4066 | mutex_unlock(&fs_info->volume_mutex); |
| 4067 | goto again; |
| 4068 | } else { |
| 4069 | /* this is (2) */ |
| 4070 | mutex_unlock(&fs_info->balance_mutex); |
| 4071 | ret = -EINPROGRESS; |
| 4072 | goto out; |
| 4073 | } |
| 4074 | } else { |
| 4075 | /* this is (1) */ |
| 4076 | mutex_unlock(&fs_info->balance_mutex); |
Anand Jain | e57138b | 2013-08-21 11:44:48 +0800 | [diff] [blame] | 4077 | ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
Ilya Dryomov | ed0fb78 | 2013-01-20 15:57:57 +0200 | [diff] [blame] | 4078 | goto out; |
| 4079 | } |
| 4080 | |
| 4081 | locked: |
| 4082 | BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running)); |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4083 | |
| 4084 | if (arg) { |
| 4085 | bargs = memdup_user(arg, sizeof(*bargs)); |
| 4086 | if (IS_ERR(bargs)) { |
| 4087 | ret = PTR_ERR(bargs); |
Ilya Dryomov | ed0fb78 | 2013-01-20 15:57:57 +0200 | [diff] [blame] | 4088 | goto out_unlock; |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4089 | } |
Ilya Dryomov | de32226 | 2012-01-16 22:04:49 +0200 | [diff] [blame] | 4090 | |
| 4091 | if (bargs->flags & BTRFS_BALANCE_RESUME) { |
| 4092 | if (!fs_info->balance_ctl) { |
| 4093 | ret = -ENOTCONN; |
| 4094 | goto out_bargs; |
| 4095 | } |
| 4096 | |
| 4097 | bctl = fs_info->balance_ctl; |
| 4098 | spin_lock(&fs_info->balance_lock); |
| 4099 | bctl->flags |= BTRFS_BALANCE_RESUME; |
| 4100 | spin_unlock(&fs_info->balance_lock); |
| 4101 | |
| 4102 | goto do_balance; |
| 4103 | } |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4104 | } else { |
| 4105 | bargs = NULL; |
| 4106 | } |
| 4107 | |
Ilya Dryomov | ed0fb78 | 2013-01-20 15:57:57 +0200 | [diff] [blame] | 4108 | if (fs_info->balance_ctl) { |
Ilya Dryomov | 837d5b6 | 2012-01-16 22:04:49 +0200 | [diff] [blame] | 4109 | ret = -EINPROGRESS; |
| 4110 | goto out_bargs; |
| 4111 | } |
| 4112 | |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4113 | bctl = kzalloc(sizeof(*bctl), GFP_NOFS); |
| 4114 | if (!bctl) { |
| 4115 | ret = -ENOMEM; |
| 4116 | goto out_bargs; |
| 4117 | } |
| 4118 | |
| 4119 | bctl->fs_info = fs_info; |
| 4120 | if (arg) { |
| 4121 | memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); |
| 4122 | memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); |
| 4123 | memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); |
| 4124 | |
| 4125 | bctl->flags = bargs->flags; |
Ilya Dryomov | f43ffb6 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4126 | } else { |
| 4127 | /* balance everything - no filters */ |
| 4128 | bctl->flags |= BTRFS_BALANCE_TYPE_MASK; |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4129 | } |
| 4130 | |
Ilya Dryomov | de32226 | 2012-01-16 22:04:49 +0200 | [diff] [blame] | 4131 | do_balance: |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4132 | /* |
Ilya Dryomov | ed0fb78 | 2013-01-20 15:57:57 +0200 | [diff] [blame] | 4133 | * Ownership of bctl and mutually_exclusive_operation_running |
| 4134 | * goes to to btrfs_balance. bctl is freed in __cancel_balance, |
| 4135 | * or, if restriper was paused all the way until unmount, in |
| 4136 | * free_fs_info. mutually_exclusive_operation_running is |
| 4137 | * cleared in __cancel_balance. |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4138 | */ |
Ilya Dryomov | ed0fb78 | 2013-01-20 15:57:57 +0200 | [diff] [blame] | 4139 | need_unlock = false; |
| 4140 | |
| 4141 | ret = btrfs_balance(bctl, bargs); |
| 4142 | |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4143 | if (arg) { |
| 4144 | if (copy_to_user(arg, bargs, sizeof(*bargs))) |
| 4145 | ret = -EFAULT; |
| 4146 | } |
| 4147 | |
| 4148 | out_bargs: |
| 4149 | kfree(bargs); |
Ilya Dryomov | ed0fb78 | 2013-01-20 15:57:57 +0200 | [diff] [blame] | 4150 | out_unlock: |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4151 | mutex_unlock(&fs_info->balance_mutex); |
| 4152 | mutex_unlock(&fs_info->volume_mutex); |
Ilya Dryomov | ed0fb78 | 2013-01-20 15:57:57 +0200 | [diff] [blame] | 4153 | if (need_unlock) |
| 4154 | atomic_set(&fs_info->mutually_exclusive_operation_running, 0); |
| 4155 | out: |
Liu Bo | e54bfa3 | 2012-06-29 03:58:48 -0600 | [diff] [blame] | 4156 | mnt_drop_write_file(file); |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4157 | return ret; |
| 4158 | } |
| 4159 | |
Ilya Dryomov | 837d5b6 | 2012-01-16 22:04:49 +0200 | [diff] [blame] | 4160 | static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd) |
| 4161 | { |
| 4162 | if (!capable(CAP_SYS_ADMIN)) |
| 4163 | return -EPERM; |
| 4164 | |
| 4165 | switch (cmd) { |
| 4166 | case BTRFS_BALANCE_CTL_PAUSE: |
| 4167 | return btrfs_pause_balance(root->fs_info); |
Ilya Dryomov | a7e99c6 | 2012-01-16 22:04:49 +0200 | [diff] [blame] | 4168 | case BTRFS_BALANCE_CTL_CANCEL: |
| 4169 | return btrfs_cancel_balance(root->fs_info); |
Ilya Dryomov | 837d5b6 | 2012-01-16 22:04:49 +0200 | [diff] [blame] | 4170 | } |
| 4171 | |
| 4172 | return -EINVAL; |
| 4173 | } |
| 4174 | |
Ilya Dryomov | 19a39dc | 2012-01-16 22:04:49 +0200 | [diff] [blame] | 4175 | static long btrfs_ioctl_balance_progress(struct btrfs_root *root, |
| 4176 | void __user *arg) |
| 4177 | { |
| 4178 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 4179 | struct btrfs_ioctl_balance_args *bargs; |
| 4180 | int ret = 0; |
| 4181 | |
| 4182 | if (!capable(CAP_SYS_ADMIN)) |
| 4183 | return -EPERM; |
| 4184 | |
| 4185 | mutex_lock(&fs_info->balance_mutex); |
| 4186 | if (!fs_info->balance_ctl) { |
| 4187 | ret = -ENOTCONN; |
| 4188 | goto out; |
| 4189 | } |
| 4190 | |
| 4191 | bargs = kzalloc(sizeof(*bargs), GFP_NOFS); |
| 4192 | if (!bargs) { |
| 4193 | ret = -ENOMEM; |
| 4194 | goto out; |
| 4195 | } |
| 4196 | |
| 4197 | update_ioctl_balance_args(fs_info, 1, bargs); |
| 4198 | |
| 4199 | if (copy_to_user(arg, bargs, sizeof(*bargs))) |
| 4200 | ret = -EFAULT; |
| 4201 | |
| 4202 | kfree(bargs); |
| 4203 | out: |
| 4204 | mutex_unlock(&fs_info->balance_mutex); |
| 4205 | return ret; |
| 4206 | } |
| 4207 | |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4208 | static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4209 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 4210 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4211 | struct btrfs_ioctl_quota_ctl_args *sa; |
| 4212 | struct btrfs_trans_handle *trans = NULL; |
| 4213 | int ret; |
| 4214 | int err; |
| 4215 | |
| 4216 | if (!capable(CAP_SYS_ADMIN)) |
| 4217 | return -EPERM; |
| 4218 | |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4219 | ret = mnt_want_write_file(file); |
| 4220 | if (ret) |
| 4221 | return ret; |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4222 | |
| 4223 | sa = memdup_user(arg, sizeof(*sa)); |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4224 | if (IS_ERR(sa)) { |
| 4225 | ret = PTR_ERR(sa); |
| 4226 | goto drop_write; |
| 4227 | } |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4228 | |
Wang Shilong | 7708f02 | 2013-04-07 10:24:57 +0000 | [diff] [blame] | 4229 | down_write(&root->fs_info->subvol_sem); |
Jan Schmidt | 2f23203 | 2013-04-25 16:04:51 +0000 | [diff] [blame] | 4230 | trans = btrfs_start_transaction(root->fs_info->tree_root, 2); |
| 4231 | if (IS_ERR(trans)) { |
| 4232 | ret = PTR_ERR(trans); |
| 4233 | goto out; |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4234 | } |
| 4235 | |
| 4236 | switch (sa->cmd) { |
| 4237 | case BTRFS_QUOTA_CTL_ENABLE: |
| 4238 | ret = btrfs_quota_enable(trans, root->fs_info); |
| 4239 | break; |
| 4240 | case BTRFS_QUOTA_CTL_DISABLE: |
| 4241 | ret = btrfs_quota_disable(trans, root->fs_info); |
| 4242 | break; |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4243 | default: |
| 4244 | ret = -EINVAL; |
| 4245 | break; |
| 4246 | } |
| 4247 | |
Jan Schmidt | 2f23203 | 2013-04-25 16:04:51 +0000 | [diff] [blame] | 4248 | err = btrfs_commit_transaction(trans, root->fs_info->tree_root); |
| 4249 | if (err && !ret) |
| 4250 | ret = err; |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4251 | out: |
| 4252 | kfree(sa); |
Wang Shilong | 7708f02 | 2013-04-07 10:24:57 +0000 | [diff] [blame] | 4253 | up_write(&root->fs_info->subvol_sem); |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4254 | drop_write: |
| 4255 | mnt_drop_write_file(file); |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4256 | return ret; |
| 4257 | } |
| 4258 | |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4259 | static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4260 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 4261 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4262 | struct btrfs_ioctl_qgroup_assign_args *sa; |
| 4263 | struct btrfs_trans_handle *trans; |
| 4264 | int ret; |
| 4265 | int err; |
| 4266 | |
| 4267 | if (!capable(CAP_SYS_ADMIN)) |
| 4268 | return -EPERM; |
| 4269 | |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4270 | ret = mnt_want_write_file(file); |
| 4271 | if (ret) |
| 4272 | return ret; |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4273 | |
| 4274 | sa = memdup_user(arg, sizeof(*sa)); |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4275 | if (IS_ERR(sa)) { |
| 4276 | ret = PTR_ERR(sa); |
| 4277 | goto drop_write; |
| 4278 | } |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4279 | |
| 4280 | trans = btrfs_join_transaction(root); |
| 4281 | if (IS_ERR(trans)) { |
| 4282 | ret = PTR_ERR(trans); |
| 4283 | goto out; |
| 4284 | } |
| 4285 | |
| 4286 | /* FIXME: check if the IDs really exist */ |
| 4287 | if (sa->assign) { |
| 4288 | ret = btrfs_add_qgroup_relation(trans, root->fs_info, |
| 4289 | sa->src, sa->dst); |
| 4290 | } else { |
| 4291 | ret = btrfs_del_qgroup_relation(trans, root->fs_info, |
| 4292 | sa->src, sa->dst); |
| 4293 | } |
| 4294 | |
| 4295 | err = btrfs_end_transaction(trans, root); |
| 4296 | if (err && !ret) |
| 4297 | ret = err; |
| 4298 | |
| 4299 | out: |
| 4300 | kfree(sa); |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4301 | drop_write: |
| 4302 | mnt_drop_write_file(file); |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4303 | return ret; |
| 4304 | } |
| 4305 | |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4306 | static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4307 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 4308 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4309 | struct btrfs_ioctl_qgroup_create_args *sa; |
| 4310 | struct btrfs_trans_handle *trans; |
| 4311 | int ret; |
| 4312 | int err; |
| 4313 | |
| 4314 | if (!capable(CAP_SYS_ADMIN)) |
| 4315 | return -EPERM; |
| 4316 | |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4317 | ret = mnt_want_write_file(file); |
| 4318 | if (ret) |
| 4319 | return ret; |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4320 | |
| 4321 | sa = memdup_user(arg, sizeof(*sa)); |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4322 | if (IS_ERR(sa)) { |
| 4323 | ret = PTR_ERR(sa); |
| 4324 | goto drop_write; |
| 4325 | } |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4326 | |
Miao Xie | d86e56c | 2012-11-15 11:35:41 +0000 | [diff] [blame] | 4327 | if (!sa->qgroupid) { |
| 4328 | ret = -EINVAL; |
| 4329 | goto out; |
| 4330 | } |
| 4331 | |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4332 | trans = btrfs_join_transaction(root); |
| 4333 | if (IS_ERR(trans)) { |
| 4334 | ret = PTR_ERR(trans); |
| 4335 | goto out; |
| 4336 | } |
| 4337 | |
| 4338 | /* FIXME: check if the IDs really exist */ |
| 4339 | if (sa->create) { |
| 4340 | ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid, |
| 4341 | NULL); |
| 4342 | } else { |
| 4343 | ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid); |
| 4344 | } |
| 4345 | |
| 4346 | err = btrfs_end_transaction(trans, root); |
| 4347 | if (err && !ret) |
| 4348 | ret = err; |
| 4349 | |
| 4350 | out: |
| 4351 | kfree(sa); |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4352 | drop_write: |
| 4353 | mnt_drop_write_file(file); |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4354 | return ret; |
| 4355 | } |
| 4356 | |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4357 | static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4358 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 4359 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4360 | struct btrfs_ioctl_qgroup_limit_args *sa; |
| 4361 | struct btrfs_trans_handle *trans; |
| 4362 | int ret; |
| 4363 | int err; |
| 4364 | u64 qgroupid; |
| 4365 | |
| 4366 | if (!capable(CAP_SYS_ADMIN)) |
| 4367 | return -EPERM; |
| 4368 | |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4369 | ret = mnt_want_write_file(file); |
| 4370 | if (ret) |
| 4371 | return ret; |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4372 | |
| 4373 | sa = memdup_user(arg, sizeof(*sa)); |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4374 | if (IS_ERR(sa)) { |
| 4375 | ret = PTR_ERR(sa); |
| 4376 | goto drop_write; |
| 4377 | } |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4378 | |
| 4379 | trans = btrfs_join_transaction(root); |
| 4380 | if (IS_ERR(trans)) { |
| 4381 | ret = PTR_ERR(trans); |
| 4382 | goto out; |
| 4383 | } |
| 4384 | |
| 4385 | qgroupid = sa->qgroupid; |
| 4386 | if (!qgroupid) { |
| 4387 | /* take the current subvol as qgroup */ |
| 4388 | qgroupid = root->root_key.objectid; |
| 4389 | } |
| 4390 | |
| 4391 | /* FIXME: check if the IDs really exist */ |
| 4392 | ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim); |
| 4393 | |
| 4394 | err = btrfs_end_transaction(trans, root); |
| 4395 | if (err && !ret) |
| 4396 | ret = err; |
| 4397 | |
| 4398 | out: |
| 4399 | kfree(sa); |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4400 | drop_write: |
| 4401 | mnt_drop_write_file(file); |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4402 | return ret; |
| 4403 | } |
| 4404 | |
Jan Schmidt | 2f23203 | 2013-04-25 16:04:51 +0000 | [diff] [blame] | 4405 | static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) |
| 4406 | { |
Al Viro | 6d0379e | 2013-06-16 19:32:35 +0400 | [diff] [blame] | 4407 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
Jan Schmidt | 2f23203 | 2013-04-25 16:04:51 +0000 | [diff] [blame] | 4408 | struct btrfs_ioctl_quota_rescan_args *qsa; |
| 4409 | int ret; |
| 4410 | |
| 4411 | if (!capable(CAP_SYS_ADMIN)) |
| 4412 | return -EPERM; |
| 4413 | |
| 4414 | ret = mnt_want_write_file(file); |
| 4415 | if (ret) |
| 4416 | return ret; |
| 4417 | |
| 4418 | qsa = memdup_user(arg, sizeof(*qsa)); |
| 4419 | if (IS_ERR(qsa)) { |
| 4420 | ret = PTR_ERR(qsa); |
| 4421 | goto drop_write; |
| 4422 | } |
| 4423 | |
| 4424 | if (qsa->flags) { |
| 4425 | ret = -EINVAL; |
| 4426 | goto out; |
| 4427 | } |
| 4428 | |
| 4429 | ret = btrfs_qgroup_rescan(root->fs_info); |
| 4430 | |
| 4431 | out: |
| 4432 | kfree(qsa); |
| 4433 | drop_write: |
| 4434 | mnt_drop_write_file(file); |
| 4435 | return ret; |
| 4436 | } |
| 4437 | |
| 4438 | static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg) |
| 4439 | { |
Al Viro | 6d0379e | 2013-06-16 19:32:35 +0400 | [diff] [blame] | 4440 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
Jan Schmidt | 2f23203 | 2013-04-25 16:04:51 +0000 | [diff] [blame] | 4441 | struct btrfs_ioctl_quota_rescan_args *qsa; |
| 4442 | int ret = 0; |
| 4443 | |
| 4444 | if (!capable(CAP_SYS_ADMIN)) |
| 4445 | return -EPERM; |
| 4446 | |
| 4447 | qsa = kzalloc(sizeof(*qsa), GFP_NOFS); |
| 4448 | if (!qsa) |
| 4449 | return -ENOMEM; |
| 4450 | |
| 4451 | if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { |
| 4452 | qsa->flags = 1; |
| 4453 | qsa->progress = root->fs_info->qgroup_rescan_progress.objectid; |
| 4454 | } |
| 4455 | |
| 4456 | if (copy_to_user(arg, qsa, sizeof(*qsa))) |
| 4457 | ret = -EFAULT; |
| 4458 | |
| 4459 | kfree(qsa); |
| 4460 | return ret; |
| 4461 | } |
| 4462 | |
Jan Schmidt | 57254b6e | 2013-05-06 19:14:17 +0000 | [diff] [blame] | 4463 | static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg) |
| 4464 | { |
Al Viro | 54563d4 | 2013-09-01 15:57:51 -0400 | [diff] [blame] | 4465 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
Jan Schmidt | 57254b6e | 2013-05-06 19:14:17 +0000 | [diff] [blame] | 4466 | |
| 4467 | if (!capable(CAP_SYS_ADMIN)) |
| 4468 | return -EPERM; |
| 4469 | |
| 4470 | return btrfs_qgroup_wait_for_completion(root->fs_info); |
| 4471 | } |
| 4472 | |
Hugo Mills | abccd00 | 2014-01-30 20:17:00 +0000 | [diff] [blame] | 4473 | static long _btrfs_ioctl_set_received_subvol(struct file *file, |
| 4474 | struct btrfs_ioctl_received_subvol_args *sa) |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 4475 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 4476 | struct inode *inode = file_inode(file); |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 4477 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 4478 | struct btrfs_root_item *root_item = &root->root_item; |
| 4479 | struct btrfs_trans_handle *trans; |
| 4480 | struct timespec ct = CURRENT_TIME; |
| 4481 | int ret = 0; |
Stefan Behrens | dd5f961 | 2013-08-15 17:11:20 +0200 | [diff] [blame] | 4482 | int received_uuid_changed; |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 4483 | |
David Sterba | bd60ea0 | 2014-01-16 15:50:22 +0100 | [diff] [blame] | 4484 | if (!inode_owner_or_capable(inode)) |
| 4485 | return -EPERM; |
| 4486 | |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 4487 | ret = mnt_want_write_file(file); |
| 4488 | if (ret < 0) |
| 4489 | return ret; |
| 4490 | |
| 4491 | down_write(&root->fs_info->subvol_sem); |
| 4492 | |
| 4493 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { |
| 4494 | ret = -EINVAL; |
| 4495 | goto out; |
| 4496 | } |
| 4497 | |
| 4498 | if (btrfs_root_readonly(root)) { |
| 4499 | ret = -EROFS; |
| 4500 | goto out; |
| 4501 | } |
| 4502 | |
Stefan Behrens | dd5f961 | 2013-08-15 17:11:20 +0200 | [diff] [blame] | 4503 | /* |
| 4504 | * 1 - root item |
| 4505 | * 2 - uuid items (received uuid + subvol uuid) |
| 4506 | */ |
| 4507 | trans = btrfs_start_transaction(root, 3); |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 4508 | if (IS_ERR(trans)) { |
| 4509 | ret = PTR_ERR(trans); |
| 4510 | trans = NULL; |
| 4511 | goto out; |
| 4512 | } |
| 4513 | |
| 4514 | sa->rtransid = trans->transid; |
| 4515 | sa->rtime.sec = ct.tv_sec; |
| 4516 | sa->rtime.nsec = ct.tv_nsec; |
| 4517 | |
Stefan Behrens | dd5f961 | 2013-08-15 17:11:20 +0200 | [diff] [blame] | 4518 | received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, |
| 4519 | BTRFS_UUID_SIZE); |
| 4520 | if (received_uuid_changed && |
| 4521 | !btrfs_is_empty_uuid(root_item->received_uuid)) |
| 4522 | btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, |
| 4523 | root_item->received_uuid, |
| 4524 | BTRFS_UUID_KEY_RECEIVED_SUBVOL, |
| 4525 | root->root_key.objectid); |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 4526 | memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); |
| 4527 | btrfs_set_root_stransid(root_item, sa->stransid); |
| 4528 | btrfs_set_root_rtransid(root_item, sa->rtransid); |
Qu Wenruo | 3cae210 | 2013-07-16 11:19:18 +0800 | [diff] [blame] | 4529 | btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); |
| 4530 | btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); |
| 4531 | btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); |
| 4532 | btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 4533 | |
| 4534 | ret = btrfs_update_root(trans, root->fs_info->tree_root, |
| 4535 | &root->root_key, &root->root_item); |
| 4536 | if (ret < 0) { |
| 4537 | btrfs_end_transaction(trans, root); |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 4538 | goto out; |
Stefan Behrens | dd5f961 | 2013-08-15 17:11:20 +0200 | [diff] [blame] | 4539 | } |
| 4540 | if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { |
| 4541 | ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, |
| 4542 | sa->uuid, |
| 4543 | BTRFS_UUID_KEY_RECEIVED_SUBVOL, |
| 4544 | root->root_key.objectid); |
| 4545 | if (ret < 0 && ret != -EEXIST) { |
| 4546 | btrfs_abort_transaction(trans, root, ret); |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 4547 | goto out; |
Stefan Behrens | dd5f961 | 2013-08-15 17:11:20 +0200 | [diff] [blame] | 4548 | } |
| 4549 | } |
| 4550 | ret = btrfs_commit_transaction(trans, root); |
| 4551 | if (ret < 0) { |
| 4552 | btrfs_abort_transaction(trans, root, ret); |
| 4553 | goto out; |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 4554 | } |
| 4555 | |
Hugo Mills | abccd00 | 2014-01-30 20:17:00 +0000 | [diff] [blame] | 4556 | out: |
| 4557 | up_write(&root->fs_info->subvol_sem); |
| 4558 | mnt_drop_write_file(file); |
| 4559 | return ret; |
| 4560 | } |
| 4561 | |
| 4562 | #ifdef CONFIG_64BIT |
| 4563 | static long btrfs_ioctl_set_received_subvol_32(struct file *file, |
| 4564 | void __user *arg) |
| 4565 | { |
| 4566 | struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; |
| 4567 | struct btrfs_ioctl_received_subvol_args *args64 = NULL; |
| 4568 | int ret = 0; |
| 4569 | |
| 4570 | args32 = memdup_user(arg, sizeof(*args32)); |
| 4571 | if (IS_ERR(args32)) { |
| 4572 | ret = PTR_ERR(args32); |
| 4573 | args32 = NULL; |
| 4574 | goto out; |
| 4575 | } |
| 4576 | |
| 4577 | args64 = kmalloc(sizeof(*args64), GFP_NOFS); |
Dan Carpenter | 84dbeb8 | 2014-03-28 11:06:00 +0300 | [diff] [blame] | 4578 | if (!args64) { |
| 4579 | ret = -ENOMEM; |
Hugo Mills | abccd00 | 2014-01-30 20:17:00 +0000 | [diff] [blame] | 4580 | goto out; |
| 4581 | } |
| 4582 | |
| 4583 | memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); |
| 4584 | args64->stransid = args32->stransid; |
| 4585 | args64->rtransid = args32->rtransid; |
| 4586 | args64->stime.sec = args32->stime.sec; |
| 4587 | args64->stime.nsec = args32->stime.nsec; |
| 4588 | args64->rtime.sec = args32->rtime.sec; |
| 4589 | args64->rtime.nsec = args32->rtime.nsec; |
| 4590 | args64->flags = args32->flags; |
| 4591 | |
| 4592 | ret = _btrfs_ioctl_set_received_subvol(file, args64); |
| 4593 | if (ret) |
| 4594 | goto out; |
| 4595 | |
| 4596 | memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); |
| 4597 | args32->stransid = args64->stransid; |
| 4598 | args32->rtransid = args64->rtransid; |
| 4599 | args32->stime.sec = args64->stime.sec; |
| 4600 | args32->stime.nsec = args64->stime.nsec; |
| 4601 | args32->rtime.sec = args64->rtime.sec; |
| 4602 | args32->rtime.nsec = args64->rtime.nsec; |
| 4603 | args32->flags = args64->flags; |
| 4604 | |
| 4605 | ret = copy_to_user(arg, args32, sizeof(*args32)); |
| 4606 | if (ret) |
| 4607 | ret = -EFAULT; |
| 4608 | |
| 4609 | out: |
| 4610 | kfree(args32); |
| 4611 | kfree(args64); |
| 4612 | return ret; |
| 4613 | } |
| 4614 | #endif |
| 4615 | |
| 4616 | static long btrfs_ioctl_set_received_subvol(struct file *file, |
| 4617 | void __user *arg) |
| 4618 | { |
| 4619 | struct btrfs_ioctl_received_subvol_args *sa = NULL; |
| 4620 | int ret = 0; |
| 4621 | |
| 4622 | sa = memdup_user(arg, sizeof(*sa)); |
| 4623 | if (IS_ERR(sa)) { |
| 4624 | ret = PTR_ERR(sa); |
| 4625 | sa = NULL; |
| 4626 | goto out; |
| 4627 | } |
| 4628 | |
| 4629 | ret = _btrfs_ioctl_set_received_subvol(file, sa); |
| 4630 | |
| 4631 | if (ret) |
| 4632 | goto out; |
| 4633 | |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 4634 | ret = copy_to_user(arg, sa, sizeof(*sa)); |
| 4635 | if (ret) |
| 4636 | ret = -EFAULT; |
| 4637 | |
| 4638 | out: |
| 4639 | kfree(sa); |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 4640 | return ret; |
| 4641 | } |
| 4642 | |
jeff.liu | 867ab66 | 2013-01-05 02:48:01 +0000 | [diff] [blame] | 4643 | static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg) |
| 4644 | { |
Al Viro | 6d0379e | 2013-06-16 19:32:35 +0400 | [diff] [blame] | 4645 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
Anand Jain | a1b83ac | 2013-07-19 17:39:32 +0800 | [diff] [blame] | 4646 | size_t len; |
jeff.liu | 867ab66 | 2013-01-05 02:48:01 +0000 | [diff] [blame] | 4647 | int ret; |
Anand Jain | a1b83ac | 2013-07-19 17:39:32 +0800 | [diff] [blame] | 4648 | char label[BTRFS_LABEL_SIZE]; |
| 4649 | |
| 4650 | spin_lock(&root->fs_info->super_lock); |
| 4651 | memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE); |
| 4652 | spin_unlock(&root->fs_info->super_lock); |
| 4653 | |
| 4654 | len = strnlen(label, BTRFS_LABEL_SIZE); |
jeff.liu | 867ab66 | 2013-01-05 02:48:01 +0000 | [diff] [blame] | 4655 | |
| 4656 | if (len == BTRFS_LABEL_SIZE) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 4657 | btrfs_warn(root->fs_info, |
| 4658 | "label is too long, return the first %zu bytes", --len); |
jeff.liu | 867ab66 | 2013-01-05 02:48:01 +0000 | [diff] [blame] | 4659 | } |
| 4660 | |
jeff.liu | 867ab66 | 2013-01-05 02:48:01 +0000 | [diff] [blame] | 4661 | ret = copy_to_user(arg, label, len); |
jeff.liu | 867ab66 | 2013-01-05 02:48:01 +0000 | [diff] [blame] | 4662 | |
| 4663 | return ret ? -EFAULT : 0; |
| 4664 | } |
| 4665 | |
jeff.liu | a8bfd4a | 2013-01-05 02:48:08 +0000 | [diff] [blame] | 4666 | static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) |
| 4667 | { |
Al Viro | 6d0379e | 2013-06-16 19:32:35 +0400 | [diff] [blame] | 4668 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
jeff.liu | a8bfd4a | 2013-01-05 02:48:08 +0000 | [diff] [blame] | 4669 | struct btrfs_super_block *super_block = root->fs_info->super_copy; |
| 4670 | struct btrfs_trans_handle *trans; |
| 4671 | char label[BTRFS_LABEL_SIZE]; |
| 4672 | int ret; |
| 4673 | |
| 4674 | if (!capable(CAP_SYS_ADMIN)) |
| 4675 | return -EPERM; |
| 4676 | |
| 4677 | if (copy_from_user(label, arg, sizeof(label))) |
| 4678 | return -EFAULT; |
| 4679 | |
| 4680 | if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 4681 | 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] | 4682 | BTRFS_LABEL_SIZE - 1); |
| 4683 | return -EINVAL; |
| 4684 | } |
| 4685 | |
| 4686 | ret = mnt_want_write_file(file); |
| 4687 | if (ret) |
| 4688 | return ret; |
| 4689 | |
jeff.liu | a8bfd4a | 2013-01-05 02:48:08 +0000 | [diff] [blame] | 4690 | trans = btrfs_start_transaction(root, 0); |
| 4691 | if (IS_ERR(trans)) { |
| 4692 | ret = PTR_ERR(trans); |
| 4693 | goto out_unlock; |
| 4694 | } |
| 4695 | |
Anand Jain | a1b83ac | 2013-07-19 17:39:32 +0800 | [diff] [blame] | 4696 | spin_lock(&root->fs_info->super_lock); |
jeff.liu | a8bfd4a | 2013-01-05 02:48:08 +0000 | [diff] [blame] | 4697 | strcpy(super_block->label, label); |
Anand Jain | a1b83ac | 2013-07-19 17:39:32 +0800 | [diff] [blame] | 4698 | spin_unlock(&root->fs_info->super_lock); |
Jeff Mahoney | d0270ac | 2014-02-07 14:33:57 +0100 | [diff] [blame] | 4699 | ret = btrfs_commit_transaction(trans, root); |
jeff.liu | a8bfd4a | 2013-01-05 02:48:08 +0000 | [diff] [blame] | 4700 | |
| 4701 | out_unlock: |
jeff.liu | a8bfd4a | 2013-01-05 02:48:08 +0000 | [diff] [blame] | 4702 | mnt_drop_write_file(file); |
| 4703 | return ret; |
| 4704 | } |
| 4705 | |
Jeff Mahoney | 2eaa055 | 2013-11-15 15:33:55 -0500 | [diff] [blame] | 4706 | #define INIT_FEATURE_FLAGS(suffix) \ |
| 4707 | { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ |
| 4708 | .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ |
| 4709 | .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } |
| 4710 | |
| 4711 | static int btrfs_ioctl_get_supported_features(struct file *file, |
| 4712 | void __user *arg) |
| 4713 | { |
| 4714 | static struct btrfs_ioctl_feature_flags features[3] = { |
| 4715 | INIT_FEATURE_FLAGS(SUPP), |
| 4716 | INIT_FEATURE_FLAGS(SAFE_SET), |
| 4717 | INIT_FEATURE_FLAGS(SAFE_CLEAR) |
| 4718 | }; |
| 4719 | |
| 4720 | if (copy_to_user(arg, &features, sizeof(features))) |
| 4721 | return -EFAULT; |
| 4722 | |
| 4723 | return 0; |
| 4724 | } |
| 4725 | |
| 4726 | static int btrfs_ioctl_get_features(struct file *file, void __user *arg) |
| 4727 | { |
| 4728 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
| 4729 | struct btrfs_super_block *super_block = root->fs_info->super_copy; |
| 4730 | struct btrfs_ioctl_feature_flags features; |
| 4731 | |
| 4732 | features.compat_flags = btrfs_super_compat_flags(super_block); |
| 4733 | features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); |
| 4734 | features.incompat_flags = btrfs_super_incompat_flags(super_block); |
| 4735 | |
| 4736 | if (copy_to_user(arg, &features, sizeof(features))) |
| 4737 | return -EFAULT; |
| 4738 | |
| 4739 | return 0; |
| 4740 | } |
| 4741 | |
Jeff Mahoney | 3b02a68 | 2013-11-01 13:07:02 -0400 | [diff] [blame] | 4742 | static int check_feature_bits(struct btrfs_root *root, |
| 4743 | enum btrfs_feature_set set, |
Jeff Mahoney | 2eaa055 | 2013-11-15 15:33:55 -0500 | [diff] [blame] | 4744 | u64 change_mask, u64 flags, u64 supported_flags, |
| 4745 | u64 safe_set, u64 safe_clear) |
| 4746 | { |
Jeff Mahoney | 3b02a68 | 2013-11-01 13:07:02 -0400 | [diff] [blame] | 4747 | const char *type = btrfs_feature_set_names[set]; |
| 4748 | char *names; |
Jeff Mahoney | 2eaa055 | 2013-11-15 15:33:55 -0500 | [diff] [blame] | 4749 | u64 disallowed, unsupported; |
| 4750 | u64 set_mask = flags & change_mask; |
| 4751 | u64 clear_mask = ~flags & change_mask; |
| 4752 | |
| 4753 | unsupported = set_mask & ~supported_flags; |
| 4754 | if (unsupported) { |
Jeff Mahoney | 3b02a68 | 2013-11-01 13:07:02 -0400 | [diff] [blame] | 4755 | names = btrfs_printable_features(set, unsupported); |
| 4756 | if (names) { |
| 4757 | btrfs_warn(root->fs_info, |
| 4758 | "this kernel does not support the %s feature bit%s", |
| 4759 | names, strchr(names, ',') ? "s" : ""); |
| 4760 | kfree(names); |
| 4761 | } else |
| 4762 | btrfs_warn(root->fs_info, |
Jeff Mahoney | 2eaa055 | 2013-11-15 15:33:55 -0500 | [diff] [blame] | 4763 | "this kernel does not support %s bits 0x%llx", |
| 4764 | type, unsupported); |
| 4765 | return -EOPNOTSUPP; |
| 4766 | } |
| 4767 | |
| 4768 | disallowed = set_mask & ~safe_set; |
| 4769 | if (disallowed) { |
Jeff Mahoney | 3b02a68 | 2013-11-01 13:07:02 -0400 | [diff] [blame] | 4770 | names = btrfs_printable_features(set, disallowed); |
| 4771 | if (names) { |
| 4772 | btrfs_warn(root->fs_info, |
| 4773 | "can't set the %s feature bit%s while mounted", |
| 4774 | names, strchr(names, ',') ? "s" : ""); |
| 4775 | kfree(names); |
| 4776 | } else |
| 4777 | btrfs_warn(root->fs_info, |
Jeff Mahoney | 2eaa055 | 2013-11-15 15:33:55 -0500 | [diff] [blame] | 4778 | "can't set %s bits 0x%llx while mounted", |
| 4779 | type, disallowed); |
| 4780 | return -EPERM; |
| 4781 | } |
| 4782 | |
| 4783 | disallowed = clear_mask & ~safe_clear; |
| 4784 | if (disallowed) { |
Jeff Mahoney | 3b02a68 | 2013-11-01 13:07:02 -0400 | [diff] [blame] | 4785 | names = btrfs_printable_features(set, disallowed); |
| 4786 | if (names) { |
| 4787 | btrfs_warn(root->fs_info, |
| 4788 | "can't clear the %s feature bit%s while mounted", |
| 4789 | names, strchr(names, ',') ? "s" : ""); |
| 4790 | kfree(names); |
| 4791 | } else |
| 4792 | btrfs_warn(root->fs_info, |
Jeff Mahoney | 2eaa055 | 2013-11-15 15:33:55 -0500 | [diff] [blame] | 4793 | "can't clear %s bits 0x%llx while mounted", |
| 4794 | type, disallowed); |
| 4795 | return -EPERM; |
| 4796 | } |
| 4797 | |
| 4798 | return 0; |
| 4799 | } |
| 4800 | |
| 4801 | #define check_feature(root, change_mask, flags, mask_base) \ |
Jeff Mahoney | 3b02a68 | 2013-11-01 13:07:02 -0400 | [diff] [blame] | 4802 | check_feature_bits(root, FEAT_##mask_base, change_mask, flags, \ |
Jeff Mahoney | 2eaa055 | 2013-11-15 15:33:55 -0500 | [diff] [blame] | 4803 | BTRFS_FEATURE_ ## mask_base ## _SUPP, \ |
| 4804 | BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ |
| 4805 | BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) |
| 4806 | |
| 4807 | static int btrfs_ioctl_set_features(struct file *file, void __user *arg) |
| 4808 | { |
| 4809 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
| 4810 | struct btrfs_super_block *super_block = root->fs_info->super_copy; |
| 4811 | struct btrfs_ioctl_feature_flags flags[2]; |
| 4812 | struct btrfs_trans_handle *trans; |
| 4813 | u64 newflags; |
| 4814 | int ret; |
| 4815 | |
| 4816 | if (!capable(CAP_SYS_ADMIN)) |
| 4817 | return -EPERM; |
| 4818 | |
| 4819 | if (copy_from_user(flags, arg, sizeof(flags))) |
| 4820 | return -EFAULT; |
| 4821 | |
| 4822 | /* Nothing to do */ |
| 4823 | if (!flags[0].compat_flags && !flags[0].compat_ro_flags && |
| 4824 | !flags[0].incompat_flags) |
| 4825 | return 0; |
| 4826 | |
| 4827 | ret = check_feature(root, flags[0].compat_flags, |
| 4828 | flags[1].compat_flags, COMPAT); |
| 4829 | if (ret) |
| 4830 | return ret; |
| 4831 | |
| 4832 | ret = check_feature(root, flags[0].compat_ro_flags, |
| 4833 | flags[1].compat_ro_flags, COMPAT_RO); |
| 4834 | if (ret) |
| 4835 | return ret; |
| 4836 | |
| 4837 | ret = check_feature(root, flags[0].incompat_flags, |
| 4838 | flags[1].incompat_flags, INCOMPAT); |
| 4839 | if (ret) |
| 4840 | return ret; |
| 4841 | |
David Sterba | 8051aa1 | 2014-02-07 14:34:04 +0100 | [diff] [blame] | 4842 | trans = btrfs_start_transaction(root, 0); |
Jeff Mahoney | 2eaa055 | 2013-11-15 15:33:55 -0500 | [diff] [blame] | 4843 | if (IS_ERR(trans)) |
| 4844 | return PTR_ERR(trans); |
| 4845 | |
| 4846 | spin_lock(&root->fs_info->super_lock); |
| 4847 | newflags = btrfs_super_compat_flags(super_block); |
| 4848 | newflags |= flags[0].compat_flags & flags[1].compat_flags; |
| 4849 | newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); |
| 4850 | btrfs_set_super_compat_flags(super_block, newflags); |
| 4851 | |
| 4852 | newflags = btrfs_super_compat_ro_flags(super_block); |
| 4853 | newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; |
| 4854 | newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); |
| 4855 | btrfs_set_super_compat_ro_flags(super_block, newflags); |
| 4856 | |
| 4857 | newflags = btrfs_super_incompat_flags(super_block); |
| 4858 | newflags |= flags[0].incompat_flags & flags[1].incompat_flags; |
| 4859 | newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); |
| 4860 | btrfs_set_super_incompat_flags(super_block, newflags); |
| 4861 | spin_unlock(&root->fs_info->super_lock); |
| 4862 | |
Jeff Mahoney | d0270ac | 2014-02-07 14:33:57 +0100 | [diff] [blame] | 4863 | return btrfs_commit_transaction(trans, root); |
Jeff Mahoney | 2eaa055 | 2013-11-15 15:33:55 -0500 | [diff] [blame] | 4864 | } |
| 4865 | |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 4866 | long btrfs_ioctl(struct file *file, unsigned int |
| 4867 | cmd, unsigned long arg) |
| 4868 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 4869 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
Christoph Hellwig | 4bcabaa | 2008-12-02 06:36:08 -0500 | [diff] [blame] | 4870 | void __user *argp = (void __user *)arg; |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 4871 | |
| 4872 | switch (cmd) { |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 4873 | case FS_IOC_GETFLAGS: |
| 4874 | return btrfs_ioctl_getflags(file, argp); |
| 4875 | case FS_IOC_SETFLAGS: |
| 4876 | return btrfs_ioctl_setflags(file, argp); |
| 4877 | case FS_IOC_GETVERSION: |
| 4878 | return btrfs_ioctl_getversion(file, argp); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 4879 | case FITRIM: |
| 4880 | return btrfs_ioctl_fitrim(file, argp); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 4881 | case BTRFS_IOC_SNAP_CREATE: |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 4882 | return btrfs_ioctl_snap_create(file, argp, 0); |
Li Zefan | fdfb1e4 | 2010-12-10 06:41:56 +0000 | [diff] [blame] | 4883 | case BTRFS_IOC_SNAP_CREATE_V2: |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 4884 | return btrfs_ioctl_snap_create_v2(file, argp, 0); |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 4885 | case BTRFS_IOC_SUBVOL_CREATE: |
Li Zefan | fa0d2b9 | 2010-12-20 15:53:28 +0800 | [diff] [blame] | 4886 | return btrfs_ioctl_snap_create(file, argp, 1); |
Arne Jansen | 6f72c7e | 2011-09-14 15:58:21 +0200 | [diff] [blame] | 4887 | case BTRFS_IOC_SUBVOL_CREATE_V2: |
| 4888 | return btrfs_ioctl_snap_create_v2(file, argp, 1); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 4889 | case BTRFS_IOC_SNAP_DESTROY: |
| 4890 | return btrfs_ioctl_snap_destroy(file, argp); |
Li Zefan | 0caa102 | 2010-12-20 16:30:25 +0800 | [diff] [blame] | 4891 | case BTRFS_IOC_SUBVOL_GETFLAGS: |
| 4892 | return btrfs_ioctl_subvol_getflags(file, argp); |
| 4893 | case BTRFS_IOC_SUBVOL_SETFLAGS: |
| 4894 | return btrfs_ioctl_subvol_setflags(file, argp); |
Josef Bacik | 6ef5ed0 | 2009-12-11 21:11:29 +0000 | [diff] [blame] | 4895 | case BTRFS_IOC_DEFAULT_SUBVOL: |
| 4896 | return btrfs_ioctl_default_subvol(file, argp); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 4897 | case BTRFS_IOC_DEFRAG: |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 4898 | return btrfs_ioctl_defrag(file, NULL); |
| 4899 | case BTRFS_IOC_DEFRAG_RANGE: |
| 4900 | return btrfs_ioctl_defrag(file, argp); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 4901 | case BTRFS_IOC_RESIZE: |
Miao Xie | 198605a | 2012-11-26 08:43:45 +0000 | [diff] [blame] | 4902 | return btrfs_ioctl_resize(file, argp); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 4903 | case BTRFS_IOC_ADD_DEV: |
Christoph Hellwig | 4bcabaa | 2008-12-02 06:36:08 -0500 | [diff] [blame] | 4904 | return btrfs_ioctl_add_dev(root, argp); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 4905 | case BTRFS_IOC_RM_DEV: |
Miao Xie | da24927 | 2012-11-26 08:44:50 +0000 | [diff] [blame] | 4906 | return btrfs_ioctl_rm_dev(file, argp); |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 4907 | case BTRFS_IOC_FS_INFO: |
| 4908 | return btrfs_ioctl_fs_info(root, argp); |
| 4909 | case BTRFS_IOC_DEV_INFO: |
| 4910 | return btrfs_ioctl_dev_info(root, argp); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 4911 | case BTRFS_IOC_BALANCE: |
Liu Bo | 9ba1f6e | 2012-05-11 18:11:26 +0800 | [diff] [blame] | 4912 | return btrfs_ioctl_balance(file, NULL); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 4913 | case BTRFS_IOC_CLONE: |
Sage Weil | c5c9cd4 | 2008-11-12 14:32:25 -0500 | [diff] [blame] | 4914 | return btrfs_ioctl_clone(file, arg, 0, 0, 0); |
| 4915 | case BTRFS_IOC_CLONE_RANGE: |
Christoph Hellwig | 7a865e8 | 2008-12-02 09:52:24 -0500 | [diff] [blame] | 4916 | return btrfs_ioctl_clone_range(file, argp); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 4917 | case BTRFS_IOC_TRANS_START: |
| 4918 | return btrfs_ioctl_trans_start(file); |
| 4919 | case BTRFS_IOC_TRANS_END: |
| 4920 | return btrfs_ioctl_trans_end(file); |
Chris Mason | ac8e981 | 2010-02-28 15:39:26 -0500 | [diff] [blame] | 4921 | case BTRFS_IOC_TREE_SEARCH: |
| 4922 | return btrfs_ioctl_tree_search(file, argp); |
| 4923 | case BTRFS_IOC_INO_LOOKUP: |
| 4924 | return btrfs_ioctl_ino_lookup(file, argp); |
Jan Schmidt | d7728c9 | 2011-07-07 16:48:38 +0200 | [diff] [blame] | 4925 | case BTRFS_IOC_INO_PATHS: |
| 4926 | return btrfs_ioctl_ino_to_path(root, argp); |
| 4927 | case BTRFS_IOC_LOGICAL_INO: |
| 4928 | return btrfs_ioctl_logical_to_ino(root, argp); |
Josef Bacik | 1406e43 | 2010-01-13 18:19:06 +0000 | [diff] [blame] | 4929 | case BTRFS_IOC_SPACE_INFO: |
| 4930 | return btrfs_ioctl_space_info(root, argp); |
Filipe David Borba Manana | 9b19985 | 2013-09-23 11:35:11 +0100 | [diff] [blame] | 4931 | case BTRFS_IOC_SYNC: { |
| 4932 | int ret; |
| 4933 | |
Miao Xie | 6c255e6 | 2014-03-06 13:55:01 +0800 | [diff] [blame] | 4934 | ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1); |
Filipe David Borba Manana | 9b19985 | 2013-09-23 11:35:11 +0100 | [diff] [blame] | 4935 | if (ret) |
| 4936 | return ret; |
| 4937 | ret = btrfs_sync_fs(file->f_dentry->d_sb, 1); |
| 4938 | return ret; |
| 4939 | } |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 4940 | case BTRFS_IOC_START_SYNC: |
Miao Xie | 9a8c28b | 2012-11-26 08:40:43 +0000 | [diff] [blame] | 4941 | return btrfs_ioctl_start_sync(root, argp); |
Sage Weil | 4620459 | 2010-10-29 15:41:32 -0400 | [diff] [blame] | 4942 | case BTRFS_IOC_WAIT_SYNC: |
Miao Xie | 9a8c28b | 2012-11-26 08:40:43 +0000 | [diff] [blame] | 4943 | return btrfs_ioctl_wait_sync(root, argp); |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 4944 | case BTRFS_IOC_SCRUB: |
Miao Xie | b8e9548 | 2012-11-26 08:48:01 +0000 | [diff] [blame] | 4945 | return btrfs_ioctl_scrub(file, argp); |
Jan Schmidt | 475f638 | 2011-03-11 15:41:01 +0100 | [diff] [blame] | 4946 | case BTRFS_IOC_SCRUB_CANCEL: |
| 4947 | return btrfs_ioctl_scrub_cancel(root, argp); |
| 4948 | case BTRFS_IOC_SCRUB_PROGRESS: |
| 4949 | return btrfs_ioctl_scrub_progress(root, argp); |
Ilya Dryomov | c9e9f97 | 2012-01-16 22:04:47 +0200 | [diff] [blame] | 4950 | case BTRFS_IOC_BALANCE_V2: |
Liu Bo | 9ba1f6e | 2012-05-11 18:11:26 +0800 | [diff] [blame] | 4951 | return btrfs_ioctl_balance(file, argp); |
Ilya Dryomov | 837d5b6 | 2012-01-16 22:04:49 +0200 | [diff] [blame] | 4952 | case BTRFS_IOC_BALANCE_CTL: |
| 4953 | return btrfs_ioctl_balance_ctl(root, arg); |
Ilya Dryomov | 19a39dc | 2012-01-16 22:04:49 +0200 | [diff] [blame] | 4954 | case BTRFS_IOC_BALANCE_PROGRESS: |
| 4955 | return btrfs_ioctl_balance_progress(root, argp); |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 4956 | case BTRFS_IOC_SET_RECEIVED_SUBVOL: |
| 4957 | return btrfs_ioctl_set_received_subvol(file, argp); |
Hugo Mills | abccd00 | 2014-01-30 20:17:00 +0000 | [diff] [blame] | 4958 | #ifdef CONFIG_64BIT |
| 4959 | case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: |
| 4960 | return btrfs_ioctl_set_received_subvol_32(file, argp); |
| 4961 | #endif |
Alexander Block | 31db9f7 | 2012-07-25 23:19:24 +0200 | [diff] [blame] | 4962 | case BTRFS_IOC_SEND: |
| 4963 | return btrfs_ioctl_send(file, argp); |
Stefan Behrens | c11d2c2 | 2012-05-25 16:06:09 +0200 | [diff] [blame] | 4964 | case BTRFS_IOC_GET_DEV_STATS: |
David Sterba | b27f7c0 | 2012-06-22 06:30:39 -0600 | [diff] [blame] | 4965 | return btrfs_ioctl_get_dev_stats(root, argp); |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4966 | case BTRFS_IOC_QUOTA_CTL: |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4967 | return btrfs_ioctl_quota_ctl(file, argp); |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4968 | case BTRFS_IOC_QGROUP_ASSIGN: |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4969 | return btrfs_ioctl_qgroup_assign(file, argp); |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4970 | case BTRFS_IOC_QGROUP_CREATE: |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4971 | return btrfs_ioctl_qgroup_create(file, argp); |
Arne Jansen | 5d13a37 | 2011-09-14 15:53:51 +0200 | [diff] [blame] | 4972 | case BTRFS_IOC_QGROUP_LIMIT: |
Miao Xie | 905b0dd | 2012-11-26 08:50:11 +0000 | [diff] [blame] | 4973 | return btrfs_ioctl_qgroup_limit(file, argp); |
Jan Schmidt | 2f23203 | 2013-04-25 16:04:51 +0000 | [diff] [blame] | 4974 | case BTRFS_IOC_QUOTA_RESCAN: |
| 4975 | return btrfs_ioctl_quota_rescan(file, argp); |
| 4976 | case BTRFS_IOC_QUOTA_RESCAN_STATUS: |
| 4977 | return btrfs_ioctl_quota_rescan_status(file, argp); |
Jan Schmidt | 57254b6e | 2013-05-06 19:14:17 +0000 | [diff] [blame] | 4978 | case BTRFS_IOC_QUOTA_RESCAN_WAIT: |
| 4979 | return btrfs_ioctl_quota_rescan_wait(file, argp); |
Stefan Behrens | 3f6bcfb | 2012-11-06 15:08:53 +0100 | [diff] [blame] | 4980 | case BTRFS_IOC_DEV_REPLACE: |
| 4981 | return btrfs_ioctl_dev_replace(root, argp); |
jeff.liu | 867ab66 | 2013-01-05 02:48:01 +0000 | [diff] [blame] | 4982 | case BTRFS_IOC_GET_FSLABEL: |
| 4983 | return btrfs_ioctl_get_fslabel(file, argp); |
jeff.liu | a8bfd4a | 2013-01-05 02:48:08 +0000 | [diff] [blame] | 4984 | case BTRFS_IOC_SET_FSLABEL: |
| 4985 | return btrfs_ioctl_set_fslabel(file, argp); |
Mark Fasheh | 416161d | 2013-08-06 11:42:51 -0700 | [diff] [blame] | 4986 | case BTRFS_IOC_FILE_EXTENT_SAME: |
| 4987 | return btrfs_ioctl_file_extent_same(file, argp); |
Jeff Mahoney | 2eaa055 | 2013-11-15 15:33:55 -0500 | [diff] [blame] | 4988 | case BTRFS_IOC_GET_SUPPORTED_FEATURES: |
| 4989 | return btrfs_ioctl_get_supported_features(file, argp); |
| 4990 | case BTRFS_IOC_GET_FEATURES: |
| 4991 | return btrfs_ioctl_get_features(file, argp); |
| 4992 | case BTRFS_IOC_SET_FEATURES: |
| 4993 | return btrfs_ioctl_set_features(file, argp); |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 4994 | } |
| 4995 | |
| 4996 | return -ENOTTY; |
| 4997 | } |