David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
Steven Whitehouse | 3a8a9a1 | 2006-05-18 15:09:15 -0400 | [diff] [blame] | 3 | * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 4 | * |
| 5 | * This copyrighted material is made available to anyone wishing to use, |
| 6 | * modify, copy, or redistribute it subject to the terms and conditions |
Steven Whitehouse | e9fc2aa | 2006-09-01 11:05:15 -0400 | [diff] [blame] | 7 | * of the GNU General Public License version 2. |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 8 | */ |
| 9 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 10 | #include <linux/slab.h> |
| 11 | #include <linux/spinlock.h> |
| 12 | #include <linux/completion.h> |
| 13 | #include <linux/buffer_head.h> |
| 14 | #include <linux/pagemap.h> |
| 15 | #include <linux/uio.h> |
| 16 | #include <linux/blkdev.h> |
| 17 | #include <linux/mm.h> |
Miklos Szeredi | f58ba88 | 2008-07-02 21:12:01 +0200 | [diff] [blame] | 18 | #include <linux/mount.h> |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 19 | #include <linux/fs.h> |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 20 | #include <linux/gfs2_ondisk.h> |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 21 | #include <linux/ext2_fs.h> |
| 22 | #include <linux/crc32.h> |
Steven Whitehouse | 33c3de3 | 2006-11-30 10:14:32 -0500 | [diff] [blame] | 23 | #include <linux/writeback.h> |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 24 | #include <asm/uaccess.h> |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 25 | #include <linux/dlm.h> |
| 26 | #include <linux/dlm_plock.h> |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 27 | |
| 28 | #include "gfs2.h" |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 29 | #include "incore.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 30 | #include "bmap.h" |
| 31 | #include "dir.h" |
| 32 | #include "glock.h" |
| 33 | #include "glops.h" |
| 34 | #include "inode.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 35 | #include "log.h" |
| 36 | #include "meta_io.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 37 | #include "quota.h" |
| 38 | #include "rgrp.h" |
| 39 | #include "trans.h" |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 40 | #include "util.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 41 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 42 | /** |
| 43 | * gfs2_llseek - seek to a location in a file |
| 44 | * @file: the file |
| 45 | * @offset: the offset |
| 46 | * @origin: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END) |
| 47 | * |
| 48 | * SEEK_END requires the glock for the file because it references the |
| 49 | * file's size. |
| 50 | * |
| 51 | * Returns: The new offset, or errno |
| 52 | */ |
| 53 | |
| 54 | static loff_t gfs2_llseek(struct file *file, loff_t offset, int origin) |
| 55 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 56 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 57 | struct gfs2_holder i_gh; |
| 58 | loff_t error; |
| 59 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 60 | if (origin == 2) { |
| 61 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, |
| 62 | &i_gh); |
| 63 | if (!error) { |
Andi Kleen | 9465efc | 2008-06-27 11:05:24 +0200 | [diff] [blame] | 64 | error = generic_file_llseek_unlocked(file, offset, origin); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 65 | gfs2_glock_dq_uninit(&i_gh); |
| 66 | } |
| 67 | } else |
Andi Kleen | 9465efc | 2008-06-27 11:05:24 +0200 | [diff] [blame] | 68 | error = generic_file_llseek_unlocked(file, offset, origin); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 69 | |
| 70 | return error; |
| 71 | } |
| 72 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 73 | /** |
Steven Whitehouse | f0e522a | 2006-09-19 16:41:11 -0400 | [diff] [blame] | 74 | * gfs2_readdir - Read directory entries from a directory |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 75 | * @file: The directory to read from |
| 76 | * @dirent: Buffer for dirents |
| 77 | * @filldir: Function used to do the copying |
| 78 | * |
| 79 | * Returns: errno |
| 80 | */ |
| 81 | |
Steven Whitehouse | f0e522a | 2006-09-19 16:41:11 -0400 | [diff] [blame] | 82 | static int gfs2_readdir(struct file *file, void *dirent, filldir_t filldir) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 83 | { |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 84 | struct inode *dir = file->f_mapping->host; |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 85 | struct gfs2_inode *dip = GFS2_I(dir); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 86 | struct gfs2_holder d_gh; |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 87 | u64 offset = file->f_pos; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 88 | int error; |
| 89 | |
Steven Whitehouse | 719ee34 | 2008-09-18 13:53:59 +0100 | [diff] [blame] | 90 | gfs2_holder_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); |
| 91 | error = gfs2_glock_nq(&d_gh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 92 | if (error) { |
| 93 | gfs2_holder_uninit(&d_gh); |
| 94 | return error; |
| 95 | } |
| 96 | |
Steven Whitehouse | 3699e3a | 2007-01-17 15:09:20 +0000 | [diff] [blame] | 97 | error = gfs2_dir_read(dir, &offset, dirent, filldir); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 98 | |
| 99 | gfs2_glock_dq_uninit(&d_gh); |
| 100 | |
| 101 | file->f_pos = offset; |
| 102 | |
| 103 | return error; |
| 104 | } |
| 105 | |
Steven Whitehouse | 128e5eb | 2006-10-02 11:24:43 -0400 | [diff] [blame] | 106 | /** |
| 107 | * fsflags_cvt |
| 108 | * @table: A table of 32 u32 flags |
| 109 | * @val: a 32 bit value to convert |
| 110 | * |
| 111 | * This function can be used to convert between fsflags values and |
| 112 | * GFS2's own flags values. |
| 113 | * |
| 114 | * Returns: the converted flags |
| 115 | */ |
| 116 | static u32 fsflags_cvt(const u32 *table, u32 val) |
| 117 | { |
| 118 | u32 res = 0; |
| 119 | while(val) { |
| 120 | if (val & 1) |
| 121 | res |= *table; |
| 122 | table++; |
| 123 | val >>= 1; |
| 124 | } |
| 125 | return res; |
| 126 | } |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 127 | |
Steven Whitehouse | 128e5eb | 2006-10-02 11:24:43 -0400 | [diff] [blame] | 128 | static const u32 fsflags_to_gfs2[32] = { |
| 129 | [3] = GFS2_DIF_SYNC, |
| 130 | [4] = GFS2_DIF_IMMUTABLE, |
| 131 | [5] = GFS2_DIF_APPENDONLY, |
| 132 | [7] = GFS2_DIF_NOATIME, |
| 133 | [12] = GFS2_DIF_EXHASH, |
Steven Whitehouse | b9af7ca | 2007-07-18 11:40:06 +0100 | [diff] [blame] | 134 | [14] = GFS2_DIF_INHERIT_JDATA, |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 135 | }; |
| 136 | |
Steven Whitehouse | 128e5eb | 2006-10-02 11:24:43 -0400 | [diff] [blame] | 137 | static const u32 gfs2_to_fsflags[32] = { |
| 138 | [gfs2fl_Sync] = FS_SYNC_FL, |
| 139 | [gfs2fl_Immutable] = FS_IMMUTABLE_FL, |
| 140 | [gfs2fl_AppendOnly] = FS_APPEND_FL, |
| 141 | [gfs2fl_NoAtime] = FS_NOATIME_FL, |
| 142 | [gfs2fl_ExHash] = FS_INDEX_FL, |
Steven Whitehouse | 128e5eb | 2006-10-02 11:24:43 -0400 | [diff] [blame] | 143 | [gfs2fl_InheritJdata] = FS_JOURNAL_DATA_FL, |
Steven Whitehouse | 7ea9ea8 | 2006-03-31 15:01:28 -0500 | [diff] [blame] | 144 | }; |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 145 | |
Steven Whitehouse | b09e593 | 2006-04-07 11:17:32 -0400 | [diff] [blame] | 146 | static int gfs2_get_flags(struct file *filp, u32 __user *ptr) |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 147 | { |
Josef Sipek | 8145409 | 2006-12-08 02:37:03 -0800 | [diff] [blame] | 148 | struct inode *inode = filp->f_path.dentry->d_inode; |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 149 | struct gfs2_inode *ip = GFS2_I(inode); |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 150 | struct gfs2_holder gh; |
| 151 | int error; |
Steven Whitehouse | 128e5eb | 2006-10-02 11:24:43 -0400 | [diff] [blame] | 152 | u32 fsflags; |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 153 | |
Steven Whitehouse | 719ee34 | 2008-09-18 13:53:59 +0100 | [diff] [blame] | 154 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); |
| 155 | error = gfs2_glock_nq(&gh); |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 156 | if (error) |
| 157 | return error; |
Steven Whitehouse | 907b9bc | 2006-09-25 09:26:04 -0400 | [diff] [blame] | 158 | |
Steven Whitehouse | 383f01f | 2008-11-04 10:05:22 +0000 | [diff] [blame] | 159 | fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_diskflags); |
| 160 | if (!S_ISDIR(inode->i_mode) && ip->i_diskflags & GFS2_DIF_JDATA) |
Steven Whitehouse | c9f6a6b | 2008-07-10 16:09:29 +0100 | [diff] [blame] | 161 | fsflags |= FS_JOURNAL_DATA_FL; |
Steven Whitehouse | 128e5eb | 2006-10-02 11:24:43 -0400 | [diff] [blame] | 162 | if (put_user(fsflags, ptr)) |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 163 | error = -EFAULT; |
| 164 | |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 165 | gfs2_glock_dq(&gh); |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 166 | gfs2_holder_uninit(&gh); |
| 167 | return error; |
| 168 | } |
| 169 | |
Steven Whitehouse | 6b124d8 | 2006-11-08 12:51:06 -0500 | [diff] [blame] | 170 | void gfs2_set_inode_flags(struct inode *inode) |
| 171 | { |
| 172 | struct gfs2_inode *ip = GFS2_I(inode); |
Steven Whitehouse | 6b124d8 | 2006-11-08 12:51:06 -0500 | [diff] [blame] | 173 | unsigned int flags = inode->i_flags; |
| 174 | |
| 175 | flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); |
Steven Whitehouse | 383f01f | 2008-11-04 10:05:22 +0000 | [diff] [blame] | 176 | if (ip->i_diskflags & GFS2_DIF_IMMUTABLE) |
Steven Whitehouse | 6b124d8 | 2006-11-08 12:51:06 -0500 | [diff] [blame] | 177 | flags |= S_IMMUTABLE; |
Steven Whitehouse | 383f01f | 2008-11-04 10:05:22 +0000 | [diff] [blame] | 178 | if (ip->i_diskflags & GFS2_DIF_APPENDONLY) |
Steven Whitehouse | 6b124d8 | 2006-11-08 12:51:06 -0500 | [diff] [blame] | 179 | flags |= S_APPEND; |
Steven Whitehouse | 383f01f | 2008-11-04 10:05:22 +0000 | [diff] [blame] | 180 | if (ip->i_diskflags & GFS2_DIF_NOATIME) |
Steven Whitehouse | 6b124d8 | 2006-11-08 12:51:06 -0500 | [diff] [blame] | 181 | flags |= S_NOATIME; |
Steven Whitehouse | 383f01f | 2008-11-04 10:05:22 +0000 | [diff] [blame] | 182 | if (ip->i_diskflags & GFS2_DIF_SYNC) |
Steven Whitehouse | 6b124d8 | 2006-11-08 12:51:06 -0500 | [diff] [blame] | 183 | flags |= S_SYNC; |
| 184 | inode->i_flags = flags; |
| 185 | } |
| 186 | |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 187 | /* Flags that can be set by user space */ |
| 188 | #define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \ |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 189 | GFS2_DIF_IMMUTABLE| \ |
| 190 | GFS2_DIF_APPENDONLY| \ |
| 191 | GFS2_DIF_NOATIME| \ |
| 192 | GFS2_DIF_SYNC| \ |
| 193 | GFS2_DIF_SYSTEM| \ |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 194 | GFS2_DIF_INHERIT_JDATA) |
| 195 | |
| 196 | /** |
| 197 | * gfs2_set_flags - set flags on an inode |
| 198 | * @inode: The inode |
| 199 | * @flags: The flags to set |
| 200 | * @mask: Indicates which flags are valid |
| 201 | * |
| 202 | */ |
Steven Whitehouse | b09e593 | 2006-04-07 11:17:32 -0400 | [diff] [blame] | 203 | static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask) |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 204 | { |
Josef Sipek | 8145409 | 2006-12-08 02:37:03 -0800 | [diff] [blame] | 205 | struct inode *inode = filp->f_path.dentry->d_inode; |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 206 | struct gfs2_inode *ip = GFS2_I(inode); |
| 207 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 208 | struct buffer_head *bh; |
| 209 | struct gfs2_holder gh; |
| 210 | int error; |
Steven Whitehouse | 55eccc6 | 2006-04-04 14:29:30 -0400 | [diff] [blame] | 211 | u32 new_flags, flags; |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 212 | |
Miklos Szeredi | f58ba88 | 2008-07-02 21:12:01 +0200 | [diff] [blame] | 213 | error = mnt_want_write(filp->f_path.mnt); |
Abhijith Das | 52f341c | 2006-07-21 02:03:21 -0400 | [diff] [blame] | 214 | if (error) |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 215 | return error; |
| 216 | |
Miklos Szeredi | f58ba88 | 2008-07-02 21:12:01 +0200 | [diff] [blame] | 217 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
| 218 | if (error) |
| 219 | goto out_drop_write; |
| 220 | |
Steven Whitehouse | 7df0e03 | 2010-05-24 14:36:48 +0100 | [diff] [blame] | 221 | error = -EACCES; |
| 222 | if (!is_owner_or_cap(inode)) |
| 223 | goto out; |
| 224 | |
| 225 | error = 0; |
Steven Whitehouse | 383f01f | 2008-11-04 10:05:22 +0000 | [diff] [blame] | 226 | flags = ip->i_diskflags; |
Steven Whitehouse | 55eccc6 | 2006-04-04 14:29:30 -0400 | [diff] [blame] | 227 | new_flags = (flags & ~mask) | (reqflags & mask); |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 228 | if ((new_flags ^ flags) == 0) |
| 229 | goto out; |
| 230 | |
| 231 | error = -EINVAL; |
| 232 | if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET) |
| 233 | goto out; |
| 234 | |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 235 | error = -EPERM; |
| 236 | if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE)) |
| 237 | goto out; |
| 238 | if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY)) |
| 239 | goto out; |
Steven Whitehouse | 907b9bc | 2006-09-25 09:26:04 -0400 | [diff] [blame] | 240 | if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) && |
Steven Whitehouse | b9cb981 | 2006-05-12 17:07:56 -0400 | [diff] [blame] | 241 | !capable(CAP_LINUX_IMMUTABLE)) |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 242 | goto out; |
Steven Whitehouse | b9cb981 | 2006-05-12 17:07:56 -0400 | [diff] [blame] | 243 | if (!IS_IMMUTABLE(inode)) { |
Miklos Szeredi | f58ba88 | 2008-07-02 21:12:01 +0200 | [diff] [blame] | 244 | error = gfs2_permission(inode, MAY_WRITE); |
Steven Whitehouse | b9cb981 | 2006-05-12 17:07:56 -0400 | [diff] [blame] | 245 | if (error) |
| 246 | goto out; |
| 247 | } |
Steven Whitehouse | 5561093 | 2007-10-17 08:47:38 +0100 | [diff] [blame] | 248 | if ((flags ^ new_flags) & GFS2_DIF_JDATA) { |
| 249 | if (flags & GFS2_DIF_JDATA) |
| 250 | gfs2_log_flush(sdp, ip->i_gl); |
| 251 | error = filemap_fdatawrite(inode->i_mapping); |
| 252 | if (error) |
| 253 | goto out; |
| 254 | error = filemap_fdatawait(inode->i_mapping); |
| 255 | if (error) |
| 256 | goto out; |
| 257 | } |
Steven Whitehouse | 55eccc6 | 2006-04-04 14:29:30 -0400 | [diff] [blame] | 258 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 259 | if (error) |
| 260 | goto out; |
Steven Whitehouse | 55eccc6 | 2006-04-04 14:29:30 -0400 | [diff] [blame] | 261 | error = gfs2_meta_inode_buffer(ip, &bh); |
| 262 | if (error) |
| 263 | goto out_trans_end; |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 264 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
Steven Whitehouse | 383f01f | 2008-11-04 10:05:22 +0000 | [diff] [blame] | 265 | ip->i_diskflags = new_flags; |
Steven Whitehouse | 539e5d6 | 2006-10-31 15:07:05 -0500 | [diff] [blame] | 266 | gfs2_dinode_out(ip, bh->b_data); |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 267 | brelse(bh); |
Steven Whitehouse | 6b124d8 | 2006-11-08 12:51:06 -0500 | [diff] [blame] | 268 | gfs2_set_inode_flags(inode); |
Steven Whitehouse | 5561093 | 2007-10-17 08:47:38 +0100 | [diff] [blame] | 269 | gfs2_set_aops(inode); |
Steven Whitehouse | 55eccc6 | 2006-04-04 14:29:30 -0400 | [diff] [blame] | 270 | out_trans_end: |
| 271 | gfs2_trans_end(sdp); |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 272 | out: |
| 273 | gfs2_glock_dq_uninit(&gh); |
Miklos Szeredi | f58ba88 | 2008-07-02 21:12:01 +0200 | [diff] [blame] | 274 | out_drop_write: |
| 275 | mnt_drop_write(filp->f_path.mnt); |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 276 | return error; |
| 277 | } |
| 278 | |
Steven Whitehouse | b09e593 | 2006-04-07 11:17:32 -0400 | [diff] [blame] | 279 | static int gfs2_set_flags(struct file *filp, u32 __user *ptr) |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 280 | { |
Steven Whitehouse | b9af7ca | 2007-07-18 11:40:06 +0100 | [diff] [blame] | 281 | struct inode *inode = filp->f_path.dentry->d_inode; |
Steven Whitehouse | 128e5eb | 2006-10-02 11:24:43 -0400 | [diff] [blame] | 282 | u32 fsflags, gfsflags; |
Steven Whitehouse | 7df0e03 | 2010-05-24 14:36:48 +0100 | [diff] [blame] | 283 | |
Steven Whitehouse | 128e5eb | 2006-10-02 11:24:43 -0400 | [diff] [blame] | 284 | if (get_user(fsflags, ptr)) |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 285 | return -EFAULT; |
Steven Whitehouse | 7df0e03 | 2010-05-24 14:36:48 +0100 | [diff] [blame] | 286 | |
Steven Whitehouse | 128e5eb | 2006-10-02 11:24:43 -0400 | [diff] [blame] | 287 | gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags); |
Steven Whitehouse | b9af7ca | 2007-07-18 11:40:06 +0100 | [diff] [blame] | 288 | if (!S_ISDIR(inode->i_mode)) { |
| 289 | if (gfsflags & GFS2_DIF_INHERIT_JDATA) |
| 290 | gfsflags ^= (GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA); |
Steven Whitehouse | b9af7ca | 2007-07-18 11:40:06 +0100 | [diff] [blame] | 291 | return do_gfs2_set_flags(filp, gfsflags, ~0); |
| 292 | } |
| 293 | return do_gfs2_set_flags(filp, gfsflags, ~GFS2_DIF_JDATA); |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 294 | } |
| 295 | |
Steven Whitehouse | b09e593 | 2006-04-07 11:17:32 -0400 | [diff] [blame] | 296 | static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 297 | { |
| 298 | switch(cmd) { |
Steven Whitehouse | 128e5eb | 2006-10-02 11:24:43 -0400 | [diff] [blame] | 299 | case FS_IOC_GETFLAGS: |
Steven Whitehouse | b09e593 | 2006-04-07 11:17:32 -0400 | [diff] [blame] | 300 | return gfs2_get_flags(filp, (u32 __user *)arg); |
Steven Whitehouse | 128e5eb | 2006-10-02 11:24:43 -0400 | [diff] [blame] | 301 | case FS_IOC_SETFLAGS: |
Steven Whitehouse | b09e593 | 2006-04-07 11:17:32 -0400 | [diff] [blame] | 302 | return gfs2_set_flags(filp, (u32 __user *)arg); |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 303 | } |
| 304 | return -ENOTTY; |
| 305 | } |
| 306 | |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 307 | /** |
| 308 | * gfs2_allocate_page_backing - Use bmap to allocate blocks |
| 309 | * @page: The (locked) page to allocate backing for |
| 310 | * |
| 311 | * We try to allocate all the blocks required for the page in |
| 312 | * one go. This might fail for various reasons, so we keep |
| 313 | * trying until all the blocks to back this page are allocated. |
| 314 | * If some of the blocks are already allocated, thats ok too. |
| 315 | */ |
| 316 | |
| 317 | static int gfs2_allocate_page_backing(struct page *page) |
| 318 | { |
| 319 | struct inode *inode = page->mapping->host; |
| 320 | struct buffer_head bh; |
| 321 | unsigned long size = PAGE_CACHE_SIZE; |
| 322 | u64 lblock = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits); |
| 323 | |
| 324 | do { |
| 325 | bh.b_state = 0; |
| 326 | bh.b_size = size; |
Bob Peterson | e9e1ef2 | 2007-12-10 14:13:27 -0600 | [diff] [blame] | 327 | gfs2_block_map(inode, lblock, &bh, 1); |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 328 | if (!buffer_mapped(&bh)) |
| 329 | return -EIO; |
| 330 | size -= bh.b_size; |
| 331 | lblock += (bh.b_size >> inode->i_blkbits); |
| 332 | } while(size > 0); |
| 333 | return 0; |
| 334 | } |
| 335 | |
| 336 | /** |
| 337 | * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable |
| 338 | * @vma: The virtual memory area |
| 339 | * @page: The page which is about to become writable |
| 340 | * |
| 341 | * When the page becomes writable, we need to ensure that we have |
| 342 | * blocks allocated on disk to back that page. |
| 343 | */ |
| 344 | |
Nick Piggin | c2ec175 | 2009-03-31 15:23:21 -0700 | [diff] [blame] | 345 | static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 346 | { |
Nick Piggin | c2ec175 | 2009-03-31 15:23:21 -0700 | [diff] [blame] | 347 | struct page *page = vmf->page; |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 348 | struct inode *inode = vma->vm_file->f_path.dentry->d_inode; |
| 349 | struct gfs2_inode *ip = GFS2_I(inode); |
| 350 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
| 351 | unsigned long last_index; |
Benjamin Marzinski | c8f554b | 2009-01-06 10:47:50 -0600 | [diff] [blame] | 352 | u64 pos = page->index << PAGE_CACHE_SHIFT; |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 353 | unsigned int data_blocks, ind_blocks, rblocks; |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 354 | struct gfs2_holder gh; |
| 355 | struct gfs2_alloc *al; |
| 356 | int ret; |
| 357 | |
Steven Whitehouse | 719ee34 | 2008-09-18 13:53:59 +0100 | [diff] [blame] | 358 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
| 359 | ret = gfs2_glock_nq(&gh); |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 360 | if (ret) |
| 361 | goto out; |
| 362 | |
Steven Whitehouse | 9c53883 | 2009-03-19 13:15:44 +0000 | [diff] [blame] | 363 | set_bit(GLF_DIRTY, &ip->i_gl->gl_flags); |
| 364 | set_bit(GIF_SW_PAGED, &ip->i_flags); |
| 365 | |
Bob Peterson | 461cb41 | 2010-06-24 19:21:20 -0400 | [diff] [blame^] | 366 | if (!gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE)) |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 367 | goto out_unlock; |
Steven Whitehouse | 6dbd822 | 2008-01-10 15:18:55 +0000 | [diff] [blame] | 368 | ret = -ENOMEM; |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 369 | al = gfs2_alloc_get(ip); |
Steven Whitehouse | 6dbd822 | 2008-01-10 15:18:55 +0000 | [diff] [blame] | 370 | if (al == NULL) |
| 371 | goto out_unlock; |
| 372 | |
Steven Whitehouse | d82661d | 2008-03-10 15:34:50 +0000 | [diff] [blame] | 373 | ret = gfs2_quota_lock_check(ip); |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 374 | if (ret) |
| 375 | goto out_alloc_put; |
Steven Whitehouse | 7ed122e | 2008-12-10 10:28:10 +0000 | [diff] [blame] | 376 | gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks); |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 377 | al->al_requested = data_blocks + ind_blocks; |
| 378 | ret = gfs2_inplace_reserve(ip); |
| 379 | if (ret) |
| 380 | goto out_quota_unlock; |
| 381 | |
| 382 | rblocks = RES_DINODE + ind_blocks; |
| 383 | if (gfs2_is_jdata(ip)) |
| 384 | rblocks += data_blocks ? data_blocks : 1; |
| 385 | if (ind_blocks || data_blocks) |
| 386 | rblocks += RES_STATFS + RES_QUOTA; |
| 387 | ret = gfs2_trans_begin(sdp, rblocks, 0); |
| 388 | if (ret) |
| 389 | goto out_trans_fail; |
| 390 | |
| 391 | lock_page(page); |
| 392 | ret = -EINVAL; |
| 393 | last_index = ip->i_inode.i_size >> PAGE_CACHE_SHIFT; |
| 394 | if (page->index > last_index) |
| 395 | goto out_unlock_page; |
Steven Whitehouse | b7fe2e3 | 2008-01-17 15:12:03 +0000 | [diff] [blame] | 396 | ret = 0; |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 397 | if (!PageUptodate(page) || page->mapping != ip->i_inode.i_mapping) |
| 398 | goto out_unlock_page; |
| 399 | if (gfs2_is_stuffed(ip)) { |
| 400 | ret = gfs2_unstuff_dinode(ip, page); |
| 401 | if (ret) |
| 402 | goto out_unlock_page; |
| 403 | } |
| 404 | ret = gfs2_allocate_page_backing(page); |
| 405 | |
| 406 | out_unlock_page: |
| 407 | unlock_page(page); |
| 408 | gfs2_trans_end(sdp); |
| 409 | out_trans_fail: |
| 410 | gfs2_inplace_release(ip); |
| 411 | out_quota_unlock: |
| 412 | gfs2_quota_unlock(ip); |
| 413 | out_alloc_put: |
| 414 | gfs2_alloc_put(ip); |
| 415 | out_unlock: |
| 416 | gfs2_glock_dq(&gh); |
| 417 | out: |
| 418 | gfs2_holder_uninit(&gh); |
Steven Whitehouse | e56985d | 2009-04-20 09:45:54 +0100 | [diff] [blame] | 419 | if (ret == -ENOMEM) |
| 420 | ret = VM_FAULT_OOM; |
| 421 | else if (ret) |
Nick Piggin | c2ec175 | 2009-03-31 15:23:21 -0700 | [diff] [blame] | 422 | ret = VM_FAULT_SIGBUS; |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 423 | return ret; |
| 424 | } |
| 425 | |
Alexey Dobriyan | f0f37e2 | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 426 | static const struct vm_operations_struct gfs2_vm_ops = { |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 427 | .fault = filemap_fault, |
| 428 | .page_mkwrite = gfs2_page_mkwrite, |
| 429 | }; |
| 430 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 431 | /** |
| 432 | * gfs2_mmap - |
| 433 | * @file: The file to map |
| 434 | * @vma: The VMA which described the mapping |
| 435 | * |
Steven Whitehouse | 48bf2b1 | 2009-04-29 13:59:35 +0100 | [diff] [blame] | 436 | * There is no need to get a lock here unless we should be updating |
| 437 | * atime. We ignore any locking errors since the only consequence is |
| 438 | * a missed atime update (which will just be deferred until later). |
| 439 | * |
| 440 | * Returns: 0 |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 441 | */ |
| 442 | |
| 443 | static int gfs2_mmap(struct file *file, struct vm_area_struct *vma) |
| 444 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 445 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 446 | |
Steven Whitehouse | 48bf2b1 | 2009-04-29 13:59:35 +0100 | [diff] [blame] | 447 | if (!(file->f_flags & O_NOATIME)) { |
| 448 | struct gfs2_holder i_gh; |
| 449 | int error; |
| 450 | |
| 451 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); |
| 452 | error = gfs2_glock_nq(&i_gh); |
| 453 | file_accessed(file); |
| 454 | if (error == 0) |
| 455 | gfs2_glock_dq_uninit(&i_gh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 456 | } |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 457 | vma->vm_ops = &gfs2_vm_ops; |
Steven Whitehouse | 48bf2b1 | 2009-04-29 13:59:35 +0100 | [diff] [blame] | 458 | vma->vm_flags |= VM_CAN_NONLINEAR; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 459 | |
Steven Whitehouse | 48bf2b1 | 2009-04-29 13:59:35 +0100 | [diff] [blame] | 460 | return 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 461 | } |
| 462 | |
| 463 | /** |
| 464 | * gfs2_open - open a file |
| 465 | * @inode: the inode to open |
| 466 | * @file: the struct file for this opening |
| 467 | * |
| 468 | * Returns: errno |
| 469 | */ |
| 470 | |
| 471 | static int gfs2_open(struct inode *inode, struct file *file) |
| 472 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 473 | struct gfs2_inode *ip = GFS2_I(inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 474 | struct gfs2_holder i_gh; |
| 475 | struct gfs2_file *fp; |
| 476 | int error; |
| 477 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 478 | fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL); |
| 479 | if (!fp) |
| 480 | return -ENOMEM; |
| 481 | |
Steven Whitehouse | f55ab26 | 2006-02-21 12:51:39 +0000 | [diff] [blame] | 482 | mutex_init(&fp->f_fl_mutex); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 483 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 484 | gfs2_assert_warn(GFS2_SB(inode), !file->private_data); |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 485 | file->private_data = fp; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 486 | |
Steven Whitehouse | b60623c | 2006-11-01 12:22:46 -0500 | [diff] [blame] | 487 | if (S_ISREG(ip->i_inode.i_mode)) { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 488 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, |
| 489 | &i_gh); |
| 490 | if (error) |
| 491 | goto fail; |
| 492 | |
| 493 | if (!(file->f_flags & O_LARGEFILE) && |
Steven Whitehouse | c9e9888 | 2008-11-04 09:47:33 +0000 | [diff] [blame] | 494 | ip->i_disksize > MAX_NON_LFS) { |
Alan Cox | a9c62a1 | 2007-10-16 23:30:22 -0700 | [diff] [blame] | 495 | error = -EOVERFLOW; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 496 | goto fail_gunlock; |
| 497 | } |
| 498 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 499 | gfs2_glock_dq_uninit(&i_gh); |
| 500 | } |
| 501 | |
| 502 | return 0; |
| 503 | |
Steven Whitehouse | 420b9e5 | 2006-07-31 15:42:17 -0400 | [diff] [blame] | 504 | fail_gunlock: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 505 | gfs2_glock_dq_uninit(&i_gh); |
Steven Whitehouse | 420b9e5 | 2006-07-31 15:42:17 -0400 | [diff] [blame] | 506 | fail: |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 507 | file->private_data = NULL; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 508 | kfree(fp); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 509 | return error; |
| 510 | } |
| 511 | |
| 512 | /** |
| 513 | * gfs2_close - called to close a struct file |
| 514 | * @inode: the inode the struct file belongs to |
| 515 | * @file: the struct file being closed |
| 516 | * |
| 517 | * Returns: errno |
| 518 | */ |
| 519 | |
| 520 | static int gfs2_close(struct inode *inode, struct file *file) |
| 521 | { |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 522 | struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 523 | struct gfs2_file *fp; |
| 524 | |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 525 | fp = file->private_data; |
| 526 | file->private_data = NULL; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 527 | |
| 528 | if (gfs2_assert_warn(sdp, fp)) |
| 529 | return -EIO; |
| 530 | |
| 531 | kfree(fp); |
| 532 | |
| 533 | return 0; |
| 534 | } |
| 535 | |
| 536 | /** |
| 537 | * gfs2_fsync - sync the dirty data for a file (across the cluster) |
| 538 | * @file: the file that points to the dentry (we ignore this) |
| 539 | * @dentry: the dentry that points to the inode to sync |
| 540 | * |
Steven Whitehouse | 33c3de3 | 2006-11-30 10:14:32 -0500 | [diff] [blame] | 541 | * The VFS will flush "normal" data for us. We only need to worry |
| 542 | * about metadata here. For journaled data, we just do a log flush |
| 543 | * as we can't avoid it. Otherwise we can just bale out if datasync |
| 544 | * is set. For stuffed inodes we must flush the log in order to |
| 545 | * ensure that all data is on disk. |
| 546 | * |
Steven Whitehouse | 34126f9 | 2006-12-07 09:13:14 -0500 | [diff] [blame] | 547 | * The call to write_inode_now() is there to write back metadata and |
| 548 | * the inode itself. It does also try and write the data, but thats |
| 549 | * (hopefully) a no-op due to the VFS having already called filemap_fdatawrite() |
| 550 | * for us. |
| 551 | * |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 552 | * Returns: errno |
| 553 | */ |
| 554 | |
Christoph Hellwig | 7ea8085 | 2010-05-26 17:53:25 +0200 | [diff] [blame] | 555 | static int gfs2_fsync(struct file *file, int datasync) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 556 | { |
Christoph Hellwig | 7ea8085 | 2010-05-26 17:53:25 +0200 | [diff] [blame] | 557 | struct inode *inode = file->f_mapping->host; |
Steven Whitehouse | 33c3de3 | 2006-11-30 10:14:32 -0500 | [diff] [blame] | 558 | int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC); |
| 559 | int ret = 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 560 | |
Steven Whitehouse | 33c3de3 | 2006-11-30 10:14:32 -0500 | [diff] [blame] | 561 | if (gfs2_is_jdata(GFS2_I(inode))) { |
| 562 | gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl); |
| 563 | return 0; |
| 564 | } |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 565 | |
Steven Whitehouse | 33c3de3 | 2006-11-30 10:14:32 -0500 | [diff] [blame] | 566 | if (sync_state != 0) { |
| 567 | if (!datasync) |
Steven Whitehouse | 34126f9 | 2006-12-07 09:13:14 -0500 | [diff] [blame] | 568 | ret = write_inode_now(inode, 0); |
Steven Whitehouse | 33c3de3 | 2006-11-30 10:14:32 -0500 | [diff] [blame] | 569 | |
| 570 | if (gfs2_is_stuffed(GFS2_I(inode))) |
| 571 | gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl); |
| 572 | } |
| 573 | |
| 574 | return ret; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 575 | } |
| 576 | |
Steven Whitehouse | 56aa616 | 2009-12-08 10:25:33 +0000 | [diff] [blame] | 577 | /** |
| 578 | * gfs2_file_aio_write - Perform a write to a file |
| 579 | * @iocb: The io context |
| 580 | * @iov: The data to write |
| 581 | * @nr_segs: Number of @iov segments |
| 582 | * @pos: The file position |
| 583 | * |
| 584 | * We have to do a lock/unlock here to refresh the inode size for |
| 585 | * O_APPEND writes, otherwise we can land up writing at the wrong |
| 586 | * offset. There is still a race, but provided the app is using its |
| 587 | * own file locking, this will make O_APPEND work as expected. |
| 588 | * |
| 589 | */ |
| 590 | |
| 591 | static ssize_t gfs2_file_aio_write(struct kiocb *iocb, const struct iovec *iov, |
| 592 | unsigned long nr_segs, loff_t pos) |
| 593 | { |
| 594 | struct file *file = iocb->ki_filp; |
| 595 | |
| 596 | if (file->f_flags & O_APPEND) { |
| 597 | struct dentry *dentry = file->f_dentry; |
| 598 | struct gfs2_inode *ip = GFS2_I(dentry->d_inode); |
| 599 | struct gfs2_holder gh; |
| 600 | int ret; |
| 601 | |
| 602 | ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); |
| 603 | if (ret) |
| 604 | return ret; |
| 605 | gfs2_glock_dq_uninit(&gh); |
| 606 | } |
| 607 | |
| 608 | return generic_file_aio_write(iocb, iov, nr_segs, pos); |
| 609 | } |
| 610 | |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 611 | #ifdef CONFIG_GFS2_FS_LOCKING_DLM |
| 612 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 613 | /** |
Marc Eshel | 6044606 | 2007-01-15 18:33:36 -0500 | [diff] [blame] | 614 | * gfs2_setlease - acquire/release a file lease |
| 615 | * @file: the file pointer |
| 616 | * @arg: lease type |
| 617 | * @fl: file lock |
| 618 | * |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 619 | * We don't currently have a way to enforce a lease across the whole |
| 620 | * cluster; until we do, disable leases (by just returning -EINVAL), |
| 621 | * unless the administrator has requested purely local locking. |
| 622 | * |
Marc Eshel | 6044606 | 2007-01-15 18:33:36 -0500 | [diff] [blame] | 623 | * Returns: errno |
| 624 | */ |
| 625 | |
| 626 | static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl) |
| 627 | { |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 628 | return -EINVAL; |
Steven Whitehouse | da755fd | 2008-01-30 15:34:04 +0000 | [diff] [blame] | 629 | } |
| 630 | |
Marc Eshel | 6044606 | 2007-01-15 18:33:36 -0500 | [diff] [blame] | 631 | /** |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 632 | * gfs2_lock - acquire/release a posix lock on a file |
| 633 | * @file: the file pointer |
| 634 | * @cmd: either modify or retrieve lock state, possibly wait |
| 635 | * @fl: type and range of lock |
| 636 | * |
| 637 | * Returns: errno |
| 638 | */ |
| 639 | |
| 640 | static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl) |
| 641 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 642 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
| 643 | struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host); |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 644 | struct lm_lockstruct *ls = &sdp->sd_lockstruct; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 645 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 646 | if (!(fl->fl_flags & FL_POSIX)) |
| 647 | return -ENOLCK; |
Sachin Prabhu | 720e774 | 2010-03-11 12:24:45 -0500 | [diff] [blame] | 648 | if (__mandatory_lock(&ip->i_inode) && fl->fl_type != F_UNLCK) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 649 | return -ENOLCK; |
| 650 | |
Marc Eshel | 586759f | 2006-11-14 16:37:25 -0500 | [diff] [blame] | 651 | if (cmd == F_CANCELLK) { |
| 652 | /* Hack: */ |
| 653 | cmd = F_SETLK; |
| 654 | fl->fl_type = F_UNLCK; |
| 655 | } |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 656 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) |
| 657 | return -EIO; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 658 | if (IS_GETLK(cmd)) |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 659 | return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 660 | else if (fl->fl_type == F_UNLCK) |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 661 | return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 662 | else |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 663 | return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 664 | } |
| 665 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 666 | static int do_flock(struct file *file, int cmd, struct file_lock *fl) |
| 667 | { |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 668 | struct gfs2_file *fp = file->private_data; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 669 | struct gfs2_holder *fl_gh = &fp->f_fl_gh; |
Josef Sipek | 8145409 | 2006-12-08 02:37:03 -0800 | [diff] [blame] | 670 | struct gfs2_inode *ip = GFS2_I(file->f_path.dentry->d_inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 671 | struct gfs2_glock *gl; |
| 672 | unsigned int state; |
| 673 | int flags; |
| 674 | int error = 0; |
| 675 | |
| 676 | state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED; |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 677 | flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 678 | |
Steven Whitehouse | f55ab26 | 2006-02-21 12:51:39 +0000 | [diff] [blame] | 679 | mutex_lock(&fp->f_fl_mutex); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 680 | |
| 681 | gl = fl_gh->gh_gl; |
| 682 | if (gl) { |
| 683 | if (fl_gh->gh_state == state) |
| 684 | goto out; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 685 | flock_lock_file_wait(file, |
Steven Whitehouse | 907b9bc | 2006-09-25 09:26:04 -0400 | [diff] [blame] | 686 | &(struct file_lock){.fl_type = F_UNLCK}); |
Abhijith Das | b4c2016 | 2007-09-13 23:35:27 -0500 | [diff] [blame] | 687 | gfs2_glock_dq_wait(fl_gh); |
| 688 | gfs2_holder_reinit(state, flags, fl_gh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 689 | } else { |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 690 | error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr, |
| 691 | &gfs2_flock_glops, CREATE, &gl); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 692 | if (error) |
| 693 | goto out; |
Abhijith Das | b4c2016 | 2007-09-13 23:35:27 -0500 | [diff] [blame] | 694 | gfs2_holder_init(gl, state, flags, fl_gh); |
| 695 | gfs2_glock_put(gl); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 696 | } |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 697 | error = gfs2_glock_nq(fl_gh); |
| 698 | if (error) { |
| 699 | gfs2_holder_uninit(fl_gh); |
| 700 | if (error == GLR_TRYFAILED) |
| 701 | error = -EAGAIN; |
| 702 | } else { |
| 703 | error = flock_lock_file_wait(file, fl); |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 704 | gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 705 | } |
| 706 | |
Steven Whitehouse | 420b9e5 | 2006-07-31 15:42:17 -0400 | [diff] [blame] | 707 | out: |
Steven Whitehouse | f55ab26 | 2006-02-21 12:51:39 +0000 | [diff] [blame] | 708 | mutex_unlock(&fp->f_fl_mutex); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 709 | return error; |
| 710 | } |
| 711 | |
| 712 | static void do_unflock(struct file *file, struct file_lock *fl) |
| 713 | { |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 714 | struct gfs2_file *fp = file->private_data; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 715 | struct gfs2_holder *fl_gh = &fp->f_fl_gh; |
| 716 | |
Steven Whitehouse | f55ab26 | 2006-02-21 12:51:39 +0000 | [diff] [blame] | 717 | mutex_lock(&fp->f_fl_mutex); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 718 | flock_lock_file_wait(file, fl); |
| 719 | if (fl_gh->gh_gl) |
| 720 | gfs2_glock_dq_uninit(fl_gh); |
Steven Whitehouse | f55ab26 | 2006-02-21 12:51:39 +0000 | [diff] [blame] | 721 | mutex_unlock(&fp->f_fl_mutex); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 722 | } |
| 723 | |
| 724 | /** |
| 725 | * gfs2_flock - acquire/release a flock lock on a file |
| 726 | * @file: the file pointer |
| 727 | * @cmd: either modify or retrieve lock state, possibly wait |
| 728 | * @fl: type and range of lock |
| 729 | * |
| 730 | * Returns: errno |
| 731 | */ |
| 732 | |
| 733 | static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl) |
| 734 | { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 735 | if (!(fl->fl_flags & FL_FLOCK)) |
| 736 | return -ENOLCK; |
Abhijith Das | a12af1e | 2009-06-01 12:30:03 -0500 | [diff] [blame] | 737 | if (fl->fl_type & LOCK_MAND) |
| 738 | return -EOPNOTSUPP; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 739 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 740 | if (fl->fl_type == F_UNLCK) { |
| 741 | do_unflock(file, fl); |
| 742 | return 0; |
Steven Whitehouse | d00223f | 2006-10-02 10:28:05 -0400 | [diff] [blame] | 743 | } else { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 744 | return do_flock(file, cmd, fl); |
Steven Whitehouse | d00223f | 2006-10-02 10:28:05 -0400 | [diff] [blame] | 745 | } |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 746 | } |
| 747 | |
Christoph Hellwig | 10d2198 | 2009-04-07 19:42:17 +0200 | [diff] [blame] | 748 | const struct file_operations gfs2_file_fops = { |
Steven Whitehouse | 26c1a57 | 2006-09-04 15:32:10 -0400 | [diff] [blame] | 749 | .llseek = gfs2_llseek, |
Steven Whitehouse | d00223f | 2006-10-02 10:28:05 -0400 | [diff] [blame] | 750 | .read = do_sync_read, |
Steven Whitehouse | 26c1a57 | 2006-09-04 15:32:10 -0400 | [diff] [blame] | 751 | .aio_read = generic_file_aio_read, |
Steven Whitehouse | d00223f | 2006-10-02 10:28:05 -0400 | [diff] [blame] | 752 | .write = do_sync_write, |
Steven Whitehouse | 56aa616 | 2009-12-08 10:25:33 +0000 | [diff] [blame] | 753 | .aio_write = gfs2_file_aio_write, |
Steven Whitehouse | 26c1a57 | 2006-09-04 15:32:10 -0400 | [diff] [blame] | 754 | .unlocked_ioctl = gfs2_ioctl, |
| 755 | .mmap = gfs2_mmap, |
| 756 | .open = gfs2_open, |
| 757 | .release = gfs2_close, |
| 758 | .fsync = gfs2_fsync, |
| 759 | .lock = gfs2_lock, |
Steven Whitehouse | 26c1a57 | 2006-09-04 15:32:10 -0400 | [diff] [blame] | 760 | .flock = gfs2_flock, |
| 761 | .splice_read = generic_file_splice_read, |
| 762 | .splice_write = generic_file_splice_write, |
Marc Eshel | 6044606 | 2007-01-15 18:33:36 -0500 | [diff] [blame] | 763 | .setlease = gfs2_setlease, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 764 | }; |
| 765 | |
Christoph Hellwig | 10d2198 | 2009-04-07 19:42:17 +0200 | [diff] [blame] | 766 | const struct file_operations gfs2_dir_fops = { |
Steven Whitehouse | 26c1a57 | 2006-09-04 15:32:10 -0400 | [diff] [blame] | 767 | .readdir = gfs2_readdir, |
| 768 | .unlocked_ioctl = gfs2_ioctl, |
| 769 | .open = gfs2_open, |
| 770 | .release = gfs2_close, |
| 771 | .fsync = gfs2_fsync, |
| 772 | .lock = gfs2_lock, |
| 773 | .flock = gfs2_flock, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 774 | }; |
| 775 | |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 776 | #endif /* CONFIG_GFS2_FS_LOCKING_DLM */ |
| 777 | |
Christoph Hellwig | 10d2198 | 2009-04-07 19:42:17 +0200 | [diff] [blame] | 778 | const struct file_operations gfs2_file_fops_nolock = { |
Wendy Cheng | c97bfe4 | 2007-11-29 17:56:51 -0500 | [diff] [blame] | 779 | .llseek = gfs2_llseek, |
| 780 | .read = do_sync_read, |
| 781 | .aio_read = generic_file_aio_read, |
| 782 | .write = do_sync_write, |
Steven Whitehouse | 56aa616 | 2009-12-08 10:25:33 +0000 | [diff] [blame] | 783 | .aio_write = gfs2_file_aio_write, |
Wendy Cheng | c97bfe4 | 2007-11-29 17:56:51 -0500 | [diff] [blame] | 784 | .unlocked_ioctl = gfs2_ioctl, |
| 785 | .mmap = gfs2_mmap, |
| 786 | .open = gfs2_open, |
| 787 | .release = gfs2_close, |
| 788 | .fsync = gfs2_fsync, |
| 789 | .splice_read = generic_file_splice_read, |
| 790 | .splice_write = generic_file_splice_write, |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 791 | .setlease = generic_setlease, |
Wendy Cheng | c97bfe4 | 2007-11-29 17:56:51 -0500 | [diff] [blame] | 792 | }; |
| 793 | |
Christoph Hellwig | 10d2198 | 2009-04-07 19:42:17 +0200 | [diff] [blame] | 794 | const struct file_operations gfs2_dir_fops_nolock = { |
Wendy Cheng | c97bfe4 | 2007-11-29 17:56:51 -0500 | [diff] [blame] | 795 | .readdir = gfs2_readdir, |
| 796 | .unlocked_ioctl = gfs2_ioctl, |
| 797 | .open = gfs2_open, |
| 798 | .release = gfs2_close, |
| 799 | .fsync = gfs2_fsync, |
| 800 | }; |
| 801 | |