Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
| 3 | * All Rights Reserved. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU General Public License as |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * published by the Free Software Foundation. |
| 8 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 9 | * This program is distributed in the hope that it would be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write the Free Software Foundation, |
| 16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include "xfs.h" |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 19 | #include "xfs_fs.h" |
Dave Chinner | 70a9883 | 2013-10-23 10:36:05 +1100 | [diff] [blame] | 20 | #include "xfs_shared.h" |
Dave Chinner | a4fbe6a | 2013-10-23 10:51:50 +1100 | [diff] [blame] | 21 | #include "xfs_format.h" |
Dave Chinner | 239880e | 2013-10-23 10:50:10 +1100 | [diff] [blame] | 22 | #include "xfs_log_format.h" |
| 23 | #include "xfs_trans_resv.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include "xfs_sb.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 25 | #include "xfs_ag.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include "xfs_mount.h" |
Dave Chinner | 5706278 | 2013-10-15 09:17:51 +1100 | [diff] [blame] | 27 | #include "xfs_da_format.h" |
| 28 | #include "xfs_da_btree.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include "xfs_inode.h" |
Dave Chinner | 239880e | 2013-10-23 10:50:10 +1100 | [diff] [blame] | 30 | #include "xfs_trans.h" |
Christoph Hellwig | fd3200b | 2010-02-15 09:44:48 +0000 | [diff] [blame] | 31 | #include "xfs_inode_item.h" |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 32 | #include "xfs_bmap.h" |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 33 | #include "xfs_bmap_util.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include "xfs_error.h" |
Dave Chinner | 2b9ab5a | 2013-08-12 20:49:37 +1000 | [diff] [blame] | 35 | #include "xfs_dir2.h" |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 36 | #include "xfs_dir2_priv.h" |
Christoph Hellwig | ddcd856 | 2008-12-03 07:55:34 -0500 | [diff] [blame] | 37 | #include "xfs_ioctl.h" |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 38 | #include "xfs_trace.h" |
Dave Chinner | 239880e | 2013-10-23 10:50:10 +1100 | [diff] [blame] | 39 | #include "xfs_log.h" |
Dave Chinner | a4fbe6a | 2013-10-23 10:51:50 +1100 | [diff] [blame] | 40 | #include "xfs_dinode.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
Kent Overstreet | a27bb33 | 2013-05-07 16:19:08 -0700 | [diff] [blame] | 42 | #include <linux/aio.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #include <linux/dcache.h> |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 44 | #include <linux/falloc.h> |
Jeff Liu | d126d43 | 2012-08-21 17:11:57 +0800 | [diff] [blame] | 45 | #include <linux/pagevec.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | |
Alexey Dobriyan | f0f37e2 | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 47 | static const struct vm_operations_struct xfs_file_vm_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 49 | /* |
Dave Chinner | 487f84f | 2011-01-12 11:37:10 +1100 | [diff] [blame] | 50 | * Locking primitives for read and write IO paths to ensure we consistently use |
| 51 | * and order the inode->i_mutex, ip->i_lock and ip->i_iolock. |
| 52 | */ |
| 53 | static inline void |
| 54 | xfs_rw_ilock( |
| 55 | struct xfs_inode *ip, |
| 56 | int type) |
| 57 | { |
| 58 | if (type & XFS_IOLOCK_EXCL) |
| 59 | mutex_lock(&VFS_I(ip)->i_mutex); |
| 60 | xfs_ilock(ip, type); |
| 61 | } |
| 62 | |
| 63 | static inline void |
| 64 | xfs_rw_iunlock( |
| 65 | struct xfs_inode *ip, |
| 66 | int type) |
| 67 | { |
| 68 | xfs_iunlock(ip, type); |
| 69 | if (type & XFS_IOLOCK_EXCL) |
| 70 | mutex_unlock(&VFS_I(ip)->i_mutex); |
| 71 | } |
| 72 | |
| 73 | static inline void |
| 74 | xfs_rw_ilock_demote( |
| 75 | struct xfs_inode *ip, |
| 76 | int type) |
| 77 | { |
| 78 | xfs_ilock_demote(ip, type); |
| 79 | if (type & XFS_IOLOCK_EXCL) |
| 80 | mutex_unlock(&VFS_I(ip)->i_mutex); |
| 81 | } |
| 82 | |
| 83 | /* |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 84 | * xfs_iozero |
| 85 | * |
| 86 | * xfs_iozero clears the specified range of buffer supplied, |
| 87 | * and marks all the affected blocks as valid and modified. If |
| 88 | * an affected block is not allocated, it will be allocated. If |
| 89 | * an affected block is not completely overwritten, and is not |
| 90 | * valid before the operation, it will be read from disk before |
| 91 | * being partially zeroed. |
| 92 | */ |
Dave Chinner | ef9d873 | 2012-11-29 15:26:33 +1100 | [diff] [blame] | 93 | int |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 94 | xfs_iozero( |
| 95 | struct xfs_inode *ip, /* inode */ |
| 96 | loff_t pos, /* offset in file */ |
| 97 | size_t count) /* size of data to zero */ |
| 98 | { |
| 99 | struct page *page; |
| 100 | struct address_space *mapping; |
| 101 | int status; |
| 102 | |
| 103 | mapping = VFS_I(ip)->i_mapping; |
| 104 | do { |
| 105 | unsigned offset, bytes; |
| 106 | void *fsdata; |
| 107 | |
| 108 | offset = (pos & (PAGE_CACHE_SIZE -1)); /* Within page */ |
| 109 | bytes = PAGE_CACHE_SIZE - offset; |
| 110 | if (bytes > count) |
| 111 | bytes = count; |
| 112 | |
| 113 | status = pagecache_write_begin(NULL, mapping, pos, bytes, |
| 114 | AOP_FLAG_UNINTERRUPTIBLE, |
| 115 | &page, &fsdata); |
| 116 | if (status) |
| 117 | break; |
| 118 | |
| 119 | zero_user(page, offset, bytes); |
| 120 | |
| 121 | status = pagecache_write_end(NULL, mapping, pos, bytes, bytes, |
| 122 | page, fsdata); |
| 123 | WARN_ON(status <= 0); /* can't return less than zero! */ |
| 124 | pos += bytes; |
| 125 | count -= bytes; |
| 126 | status = 0; |
| 127 | } while (count); |
| 128 | |
| 129 | return (-status); |
| 130 | } |
| 131 | |
Christoph Hellwig | 1da2f2d | 2011-10-02 14:25:16 +0000 | [diff] [blame] | 132 | /* |
| 133 | * Fsync operations on directories are much simpler than on regular files, |
| 134 | * as there is no file data to flush, and thus also no need for explicit |
| 135 | * cache flush operations, and there are no non-transaction metadata updates |
| 136 | * on directories either. |
| 137 | */ |
| 138 | STATIC int |
| 139 | xfs_dir_fsync( |
| 140 | struct file *file, |
| 141 | loff_t start, |
| 142 | loff_t end, |
| 143 | int datasync) |
| 144 | { |
| 145 | struct xfs_inode *ip = XFS_I(file->f_mapping->host); |
| 146 | struct xfs_mount *mp = ip->i_mount; |
| 147 | xfs_lsn_t lsn = 0; |
| 148 | |
| 149 | trace_xfs_dir_fsync(ip); |
| 150 | |
| 151 | xfs_ilock(ip, XFS_ILOCK_SHARED); |
| 152 | if (xfs_ipincount(ip)) |
| 153 | lsn = ip->i_itemp->ili_last_lsn; |
| 154 | xfs_iunlock(ip, XFS_ILOCK_SHARED); |
| 155 | |
| 156 | if (!lsn) |
| 157 | return 0; |
| 158 | return _xfs_log_force_lsn(mp, lsn, XFS_LOG_SYNC, NULL); |
| 159 | } |
| 160 | |
Christoph Hellwig | fd3200b | 2010-02-15 09:44:48 +0000 | [diff] [blame] | 161 | STATIC int |
| 162 | xfs_file_fsync( |
| 163 | struct file *file, |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 164 | loff_t start, |
| 165 | loff_t end, |
Christoph Hellwig | fd3200b | 2010-02-15 09:44:48 +0000 | [diff] [blame] | 166 | int datasync) |
| 167 | { |
Christoph Hellwig | 7ea8085 | 2010-05-26 17:53:25 +0200 | [diff] [blame] | 168 | struct inode *inode = file->f_mapping->host; |
| 169 | struct xfs_inode *ip = XFS_I(inode); |
Christoph Hellwig | a27a263 | 2011-06-16 12:02:23 +0000 | [diff] [blame] | 170 | struct xfs_mount *mp = ip->i_mount; |
Christoph Hellwig | fd3200b | 2010-02-15 09:44:48 +0000 | [diff] [blame] | 171 | int error = 0; |
| 172 | int log_flushed = 0; |
Christoph Hellwig | b103705 | 2011-09-19 14:55:51 +0000 | [diff] [blame] | 173 | xfs_lsn_t lsn = 0; |
Christoph Hellwig | fd3200b | 2010-02-15 09:44:48 +0000 | [diff] [blame] | 174 | |
Christoph Hellwig | cca28fb | 2010-06-24 11:57:09 +1000 | [diff] [blame] | 175 | trace_xfs_file_fsync(ip); |
Christoph Hellwig | fd3200b | 2010-02-15 09:44:48 +0000 | [diff] [blame] | 176 | |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 177 | error = filemap_write_and_wait_range(inode->i_mapping, start, end); |
| 178 | if (error) |
| 179 | return error; |
| 180 | |
Christoph Hellwig | a27a263 | 2011-06-16 12:02:23 +0000 | [diff] [blame] | 181 | if (XFS_FORCED_SHUTDOWN(mp)) |
Christoph Hellwig | fd3200b | 2010-02-15 09:44:48 +0000 | [diff] [blame] | 182 | return -XFS_ERROR(EIO); |
| 183 | |
| 184 | xfs_iflags_clear(ip, XFS_ITRUNCATED); |
| 185 | |
Christoph Hellwig | a27a263 | 2011-06-16 12:02:23 +0000 | [diff] [blame] | 186 | if (mp->m_flags & XFS_MOUNT_BARRIER) { |
| 187 | /* |
| 188 | * If we have an RT and/or log subvolume we need to make sure |
| 189 | * to flush the write cache the device used for file data |
| 190 | * first. This is to ensure newly written file data make |
| 191 | * it to disk before logging the new inode size in case of |
| 192 | * an extending write. |
| 193 | */ |
| 194 | if (XFS_IS_REALTIME_INODE(ip)) |
| 195 | xfs_blkdev_issue_flush(mp->m_rtdev_targp); |
| 196 | else if (mp->m_logdev_targp != mp->m_ddev_targp) |
| 197 | xfs_blkdev_issue_flush(mp->m_ddev_targp); |
| 198 | } |
| 199 | |
Christoph Hellwig | fd3200b | 2010-02-15 09:44:48 +0000 | [diff] [blame] | 200 | /* |
Christoph Hellwig | 8a9c998 | 2012-02-29 09:53:52 +0000 | [diff] [blame] | 201 | * All metadata updates are logged, which means that we just have |
| 202 | * to flush the log up to the latest LSN that touched the inode. |
Christoph Hellwig | fd3200b | 2010-02-15 09:44:48 +0000 | [diff] [blame] | 203 | */ |
| 204 | xfs_ilock(ip, XFS_ILOCK_SHARED); |
Christoph Hellwig | 8f639dd | 2012-02-29 09:53:55 +0000 | [diff] [blame] | 205 | if (xfs_ipincount(ip)) { |
| 206 | if (!datasync || |
| 207 | (ip->i_itemp->ili_fields & ~XFS_ILOG_TIMESTAMP)) |
| 208 | lsn = ip->i_itemp->ili_last_lsn; |
| 209 | } |
Christoph Hellwig | 8a9c998 | 2012-02-29 09:53:52 +0000 | [diff] [blame] | 210 | xfs_iunlock(ip, XFS_ILOCK_SHARED); |
Christoph Hellwig | fd3200b | 2010-02-15 09:44:48 +0000 | [diff] [blame] | 211 | |
Christoph Hellwig | 8a9c998 | 2012-02-29 09:53:52 +0000 | [diff] [blame] | 212 | if (lsn) |
Christoph Hellwig | b103705 | 2011-09-19 14:55:51 +0000 | [diff] [blame] | 213 | error = _xfs_log_force_lsn(mp, lsn, XFS_LOG_SYNC, &log_flushed); |
| 214 | |
Christoph Hellwig | a27a263 | 2011-06-16 12:02:23 +0000 | [diff] [blame] | 215 | /* |
| 216 | * If we only have a single device, and the log force about was |
| 217 | * a no-op we might have to flush the data device cache here. |
| 218 | * This can only happen for fdatasync/O_DSYNC if we were overwriting |
| 219 | * an already allocated file and thus do not have any metadata to |
| 220 | * commit. |
| 221 | */ |
| 222 | if ((mp->m_flags & XFS_MOUNT_BARRIER) && |
| 223 | mp->m_logdev_targp == mp->m_ddev_targp && |
| 224 | !XFS_IS_REALTIME_INODE(ip) && |
| 225 | !log_flushed) |
| 226 | xfs_blkdev_issue_flush(mp->m_ddev_targp); |
Christoph Hellwig | fd3200b | 2010-02-15 09:44:48 +0000 | [diff] [blame] | 227 | |
| 228 | return -error; |
| 229 | } |
| 230 | |
Christoph Hellwig | 00258e3 | 2010-02-15 09:44:47 +0000 | [diff] [blame] | 231 | STATIC ssize_t |
| 232 | xfs_file_aio_read( |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 233 | struct kiocb *iocb, |
| 234 | const struct iovec *iovp, |
Christoph Hellwig | 00258e3 | 2010-02-15 09:44:47 +0000 | [diff] [blame] | 235 | unsigned long nr_segs, |
| 236 | loff_t pos) |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 237 | { |
| 238 | struct file *file = iocb->ki_filp; |
| 239 | struct inode *inode = file->f_mapping->host; |
Christoph Hellwig | 00258e3 | 2010-02-15 09:44:47 +0000 | [diff] [blame] | 240 | struct xfs_inode *ip = XFS_I(inode); |
| 241 | struct xfs_mount *mp = ip->i_mount; |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 242 | size_t size = 0; |
| 243 | ssize_t ret = 0; |
Christoph Hellwig | 00258e3 | 2010-02-15 09:44:47 +0000 | [diff] [blame] | 244 | int ioflags = 0; |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 245 | xfs_fsize_t n; |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 246 | |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 247 | XFS_STATS_INC(xs_read_calls); |
| 248 | |
Christoph Hellwig | 00258e3 | 2010-02-15 09:44:47 +0000 | [diff] [blame] | 249 | BUG_ON(iocb->ki_pos != pos); |
| 250 | |
| 251 | if (unlikely(file->f_flags & O_DIRECT)) |
| 252 | ioflags |= IO_ISDIRECT; |
| 253 | if (file->f_mode & FMODE_NOCMTIME) |
| 254 | ioflags |= IO_INVIS; |
| 255 | |
Dave Chinner | 5276432 | 2012-06-08 15:45:44 +1000 | [diff] [blame] | 256 | ret = generic_segment_checks(iovp, &nr_segs, &size, VERIFY_WRITE); |
| 257 | if (ret < 0) |
| 258 | return ret; |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 259 | |
| 260 | if (unlikely(ioflags & IO_ISDIRECT)) { |
| 261 | xfs_buftarg_t *target = |
| 262 | XFS_IS_REALTIME_INODE(ip) ? |
| 263 | mp->m_rtdev_targp : mp->m_ddev_targp; |
Dave Chinner | fb59581 | 2012-11-12 22:53:57 +1100 | [diff] [blame] | 264 | if ((pos & target->bt_smask) || (size & target->bt_smask)) { |
| 265 | if (pos == i_size_read(inode)) |
Christoph Hellwig | 00258e3 | 2010-02-15 09:44:47 +0000 | [diff] [blame] | 266 | return 0; |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 267 | return -XFS_ERROR(EINVAL); |
| 268 | } |
| 269 | } |
| 270 | |
Dave Chinner | fb59581 | 2012-11-12 22:53:57 +1100 | [diff] [blame] | 271 | n = mp->m_super->s_maxbytes - pos; |
Christoph Hellwig | 00258e3 | 2010-02-15 09:44:47 +0000 | [diff] [blame] | 272 | if (n <= 0 || size == 0) |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 273 | return 0; |
| 274 | |
| 275 | if (n < size) |
| 276 | size = n; |
| 277 | |
| 278 | if (XFS_FORCED_SHUTDOWN(mp)) |
| 279 | return -EIO; |
| 280 | |
Dave Chinner | 0c38a25 | 2011-08-25 07:17:01 +0000 | [diff] [blame] | 281 | /* |
| 282 | * Locking is a bit tricky here. If we take an exclusive lock |
| 283 | * for direct IO, we effectively serialise all new concurrent |
| 284 | * read IO to this file and block it behind IO that is currently in |
| 285 | * progress because IO in progress holds the IO lock shared. We only |
| 286 | * need to hold the lock exclusive to blow away the page cache, so |
| 287 | * only take lock exclusively if the page cache needs invalidation. |
| 288 | * This allows the normal direct IO case of no page cache pages to |
| 289 | * proceeed concurrently without serialisation. |
| 290 | */ |
| 291 | xfs_rw_ilock(ip, XFS_IOLOCK_SHARED); |
| 292 | if ((ioflags & IO_ISDIRECT) && inode->i_mapping->nrpages) { |
| 293 | xfs_rw_iunlock(ip, XFS_IOLOCK_SHARED); |
Dave Chinner | 487f84f | 2011-01-12 11:37:10 +1100 | [diff] [blame] | 294 | xfs_rw_ilock(ip, XFS_IOLOCK_EXCL); |
| 295 | |
Christoph Hellwig | 00258e3 | 2010-02-15 09:44:47 +0000 | [diff] [blame] | 296 | if (inode->i_mapping->nrpages) { |
Dave Chinner | fb59581 | 2012-11-12 22:53:57 +1100 | [diff] [blame] | 297 | ret = -filemap_write_and_wait_range( |
| 298 | VFS_I(ip)->i_mapping, |
| 299 | pos, -1); |
Dave Chinner | 487f84f | 2011-01-12 11:37:10 +1100 | [diff] [blame] | 300 | if (ret) { |
| 301 | xfs_rw_iunlock(ip, XFS_IOLOCK_EXCL); |
| 302 | return ret; |
| 303 | } |
Dave Chinner | fb59581 | 2012-11-12 22:53:57 +1100 | [diff] [blame] | 304 | truncate_pagecache_range(VFS_I(ip), pos, -1); |
Christoph Hellwig | 00258e3 | 2010-02-15 09:44:47 +0000 | [diff] [blame] | 305 | } |
Dave Chinner | 487f84f | 2011-01-12 11:37:10 +1100 | [diff] [blame] | 306 | xfs_rw_ilock_demote(ip, XFS_IOLOCK_EXCL); |
Dave Chinner | 0c38a25 | 2011-08-25 07:17:01 +0000 | [diff] [blame] | 307 | } |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 308 | |
Dave Chinner | fb59581 | 2012-11-12 22:53:57 +1100 | [diff] [blame] | 309 | trace_xfs_file_read(ip, size, pos, ioflags); |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 310 | |
Dave Chinner | fb59581 | 2012-11-12 22:53:57 +1100 | [diff] [blame] | 311 | ret = generic_file_aio_read(iocb, iovp, nr_segs, pos); |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 312 | if (ret > 0) |
| 313 | XFS_STATS_ADD(xs_read_bytes, ret); |
| 314 | |
Dave Chinner | 487f84f | 2011-01-12 11:37:10 +1100 | [diff] [blame] | 315 | xfs_rw_iunlock(ip, XFS_IOLOCK_SHARED); |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 316 | return ret; |
| 317 | } |
| 318 | |
Christoph Hellwig | 00258e3 | 2010-02-15 09:44:47 +0000 | [diff] [blame] | 319 | STATIC ssize_t |
| 320 | xfs_file_splice_read( |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 321 | struct file *infilp, |
| 322 | loff_t *ppos, |
| 323 | struct pipe_inode_info *pipe, |
| 324 | size_t count, |
Christoph Hellwig | 00258e3 | 2010-02-15 09:44:47 +0000 | [diff] [blame] | 325 | unsigned int flags) |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 326 | { |
Christoph Hellwig | 00258e3 | 2010-02-15 09:44:47 +0000 | [diff] [blame] | 327 | struct xfs_inode *ip = XFS_I(infilp->f_mapping->host); |
Christoph Hellwig | 00258e3 | 2010-02-15 09:44:47 +0000 | [diff] [blame] | 328 | int ioflags = 0; |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 329 | ssize_t ret; |
| 330 | |
| 331 | XFS_STATS_INC(xs_read_calls); |
Christoph Hellwig | 00258e3 | 2010-02-15 09:44:47 +0000 | [diff] [blame] | 332 | |
| 333 | if (infilp->f_mode & FMODE_NOCMTIME) |
| 334 | ioflags |= IO_INVIS; |
| 335 | |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 336 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) |
| 337 | return -EIO; |
| 338 | |
Dave Chinner | 487f84f | 2011-01-12 11:37:10 +1100 | [diff] [blame] | 339 | xfs_rw_ilock(ip, XFS_IOLOCK_SHARED); |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 340 | |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 341 | trace_xfs_file_splice_read(ip, count, *ppos, ioflags); |
| 342 | |
| 343 | ret = generic_file_splice_read(infilp, ppos, pipe, count, flags); |
| 344 | if (ret > 0) |
| 345 | XFS_STATS_ADD(xs_read_bytes, ret); |
| 346 | |
Dave Chinner | 487f84f | 2011-01-12 11:37:10 +1100 | [diff] [blame] | 347 | xfs_rw_iunlock(ip, XFS_IOLOCK_SHARED); |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 348 | return ret; |
| 349 | } |
| 350 | |
Dave Chinner | 4c5cfd1 | 2011-01-11 10:14:16 +1100 | [diff] [blame] | 351 | /* |
Dave Chinner | 487f84f | 2011-01-12 11:37:10 +1100 | [diff] [blame] | 352 | * xfs_file_splice_write() does not use xfs_rw_ilock() because |
| 353 | * generic_file_splice_write() takes the i_mutex itself. This, in theory, |
| 354 | * couuld cause lock inversions between the aio_write path and the splice path |
| 355 | * if someone is doing concurrent splice(2) based writes and write(2) based |
| 356 | * writes to the same inode. The only real way to fix this is to re-implement |
| 357 | * the generic code here with correct locking orders. |
| 358 | */ |
Christoph Hellwig | 00258e3 | 2010-02-15 09:44:47 +0000 | [diff] [blame] | 359 | STATIC ssize_t |
| 360 | xfs_file_splice_write( |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 361 | struct pipe_inode_info *pipe, |
| 362 | struct file *outfilp, |
| 363 | loff_t *ppos, |
| 364 | size_t count, |
Christoph Hellwig | 00258e3 | 2010-02-15 09:44:47 +0000 | [diff] [blame] | 365 | unsigned int flags) |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 366 | { |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 367 | struct inode *inode = outfilp->f_mapping->host; |
Christoph Hellwig | 00258e3 | 2010-02-15 09:44:47 +0000 | [diff] [blame] | 368 | struct xfs_inode *ip = XFS_I(inode); |
Christoph Hellwig | 00258e3 | 2010-02-15 09:44:47 +0000 | [diff] [blame] | 369 | int ioflags = 0; |
| 370 | ssize_t ret; |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 371 | |
| 372 | XFS_STATS_INC(xs_write_calls); |
Christoph Hellwig | 00258e3 | 2010-02-15 09:44:47 +0000 | [diff] [blame] | 373 | |
| 374 | if (outfilp->f_mode & FMODE_NOCMTIME) |
| 375 | ioflags |= IO_INVIS; |
| 376 | |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 377 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) |
| 378 | return -EIO; |
| 379 | |
| 380 | xfs_ilock(ip, XFS_IOLOCK_EXCL); |
| 381 | |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 382 | trace_xfs_file_splice_write(ip, count, *ppos, ioflags); |
| 383 | |
| 384 | ret = generic_file_splice_write(pipe, outfilp, ppos, count, flags); |
Christoph Hellwig | ce7ae151 | 2011-12-18 20:00:11 +0000 | [diff] [blame] | 385 | if (ret > 0) |
| 386 | XFS_STATS_ADD(xs_write_bytes, ret); |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 387 | |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 388 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); |
| 389 | return ret; |
| 390 | } |
| 391 | |
| 392 | /* |
Christoph Hellwig | 193aec1 | 2012-03-27 10:34:49 -0400 | [diff] [blame] | 393 | * This routine is called to handle zeroing any space in the last block of the |
| 394 | * file that is beyond the EOF. We do this since the size is being increased |
| 395 | * without writing anything to that block and we don't want to read the |
| 396 | * garbage on the disk. |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 397 | */ |
| 398 | STATIC int /* error (positive) */ |
| 399 | xfs_zero_last_block( |
Christoph Hellwig | 193aec1 | 2012-03-27 10:34:49 -0400 | [diff] [blame] | 400 | struct xfs_inode *ip, |
| 401 | xfs_fsize_t offset, |
| 402 | xfs_fsize_t isize) |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 403 | { |
Christoph Hellwig | 193aec1 | 2012-03-27 10:34:49 -0400 | [diff] [blame] | 404 | struct xfs_mount *mp = ip->i_mount; |
| 405 | xfs_fileoff_t last_fsb = XFS_B_TO_FSBT(mp, isize); |
| 406 | int zero_offset = XFS_B_FSB_OFFSET(mp, isize); |
| 407 | int zero_len; |
| 408 | int nimaps = 1; |
| 409 | int error = 0; |
| 410 | struct xfs_bmbt_irec imap; |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 411 | |
Christoph Hellwig | 193aec1 | 2012-03-27 10:34:49 -0400 | [diff] [blame] | 412 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
Dave Chinner | 5c8ed20 | 2011-09-18 20:40:45 +0000 | [diff] [blame] | 413 | error = xfs_bmapi_read(ip, last_fsb, 1, &imap, &nimaps, 0); |
Christoph Hellwig | 193aec1 | 2012-03-27 10:34:49 -0400 | [diff] [blame] | 414 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
Dave Chinner | 5c8ed20 | 2011-09-18 20:40:45 +0000 | [diff] [blame] | 415 | if (error) |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 416 | return error; |
Christoph Hellwig | 193aec1 | 2012-03-27 10:34:49 -0400 | [diff] [blame] | 417 | |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 418 | ASSERT(nimaps > 0); |
Christoph Hellwig | 193aec1 | 2012-03-27 10:34:49 -0400 | [diff] [blame] | 419 | |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 420 | /* |
| 421 | * If the block underlying isize is just a hole, then there |
| 422 | * is nothing to zero. |
| 423 | */ |
Christoph Hellwig | 193aec1 | 2012-03-27 10:34:49 -0400 | [diff] [blame] | 424 | if (imap.br_startblock == HOLESTARTBLOCK) |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 425 | return 0; |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 426 | |
| 427 | zero_len = mp->m_sb.sb_blocksize - zero_offset; |
| 428 | if (isize + zero_len > offset) |
| 429 | zero_len = offset - isize; |
Christoph Hellwig | 193aec1 | 2012-03-27 10:34:49 -0400 | [diff] [blame] | 430 | return xfs_iozero(ip, isize, zero_len); |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 431 | } |
| 432 | |
| 433 | /* |
Christoph Hellwig | 193aec1 | 2012-03-27 10:34:49 -0400 | [diff] [blame] | 434 | * Zero any on disk space between the current EOF and the new, larger EOF. |
| 435 | * |
| 436 | * This handles the normal case of zeroing the remainder of the last block in |
| 437 | * the file and the unusual case of zeroing blocks out beyond the size of the |
| 438 | * file. This second case only happens with fixed size extents and when the |
| 439 | * system crashes before the inode size was updated but after blocks were |
| 440 | * allocated. |
| 441 | * |
| 442 | * Expects the iolock to be held exclusive, and will take the ilock internally. |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 443 | */ |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 444 | int /* error (positive) */ |
| 445 | xfs_zero_eof( |
Christoph Hellwig | 193aec1 | 2012-03-27 10:34:49 -0400 | [diff] [blame] | 446 | struct xfs_inode *ip, |
| 447 | xfs_off_t offset, /* starting I/O offset */ |
| 448 | xfs_fsize_t isize) /* current inode size */ |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 449 | { |
Christoph Hellwig | 193aec1 | 2012-03-27 10:34:49 -0400 | [diff] [blame] | 450 | struct xfs_mount *mp = ip->i_mount; |
| 451 | xfs_fileoff_t start_zero_fsb; |
| 452 | xfs_fileoff_t end_zero_fsb; |
| 453 | xfs_fileoff_t zero_count_fsb; |
| 454 | xfs_fileoff_t last_fsb; |
| 455 | xfs_fileoff_t zero_off; |
| 456 | xfs_fsize_t zero_len; |
| 457 | int nimaps; |
| 458 | int error = 0; |
| 459 | struct xfs_bmbt_irec imap; |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 460 | |
Christoph Hellwig | 193aec1 | 2012-03-27 10:34:49 -0400 | [diff] [blame] | 461 | ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL)); |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 462 | ASSERT(offset > isize); |
| 463 | |
| 464 | /* |
| 465 | * First handle zeroing the block on which isize resides. |
Christoph Hellwig | 193aec1 | 2012-03-27 10:34:49 -0400 | [diff] [blame] | 466 | * |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 467 | * We only zero a part of that block so it is handled specially. |
| 468 | */ |
Christoph Hellwig | 193aec1 | 2012-03-27 10:34:49 -0400 | [diff] [blame] | 469 | if (XFS_B_FSB_OFFSET(mp, isize) != 0) { |
| 470 | error = xfs_zero_last_block(ip, offset, isize); |
| 471 | if (error) |
| 472 | return error; |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 473 | } |
| 474 | |
| 475 | /* |
Christoph Hellwig | 193aec1 | 2012-03-27 10:34:49 -0400 | [diff] [blame] | 476 | * Calculate the range between the new size and the old where blocks |
| 477 | * needing to be zeroed may exist. |
| 478 | * |
| 479 | * To get the block where the last byte in the file currently resides, |
| 480 | * we need to subtract one from the size and truncate back to a block |
| 481 | * boundary. We subtract 1 in case the size is exactly on a block |
| 482 | * boundary. |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 483 | */ |
| 484 | last_fsb = isize ? XFS_B_TO_FSBT(mp, isize - 1) : (xfs_fileoff_t)-1; |
| 485 | start_zero_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)isize); |
| 486 | end_zero_fsb = XFS_B_TO_FSBT(mp, offset - 1); |
| 487 | ASSERT((xfs_sfiloff_t)last_fsb < (xfs_sfiloff_t)start_zero_fsb); |
| 488 | if (last_fsb == end_zero_fsb) { |
| 489 | /* |
| 490 | * The size was only incremented on its last block. |
| 491 | * We took care of that above, so just return. |
| 492 | */ |
| 493 | return 0; |
| 494 | } |
| 495 | |
| 496 | ASSERT(start_zero_fsb <= end_zero_fsb); |
| 497 | while (start_zero_fsb <= end_zero_fsb) { |
| 498 | nimaps = 1; |
| 499 | zero_count_fsb = end_zero_fsb - start_zero_fsb + 1; |
Christoph Hellwig | 193aec1 | 2012-03-27 10:34:49 -0400 | [diff] [blame] | 500 | |
| 501 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
Dave Chinner | 5c8ed20 | 2011-09-18 20:40:45 +0000 | [diff] [blame] | 502 | error = xfs_bmapi_read(ip, start_zero_fsb, zero_count_fsb, |
| 503 | &imap, &nimaps, 0); |
Christoph Hellwig | 193aec1 | 2012-03-27 10:34:49 -0400 | [diff] [blame] | 504 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
| 505 | if (error) |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 506 | return error; |
Christoph Hellwig | 193aec1 | 2012-03-27 10:34:49 -0400 | [diff] [blame] | 507 | |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 508 | ASSERT(nimaps > 0); |
| 509 | |
| 510 | if (imap.br_state == XFS_EXT_UNWRITTEN || |
| 511 | imap.br_startblock == HOLESTARTBLOCK) { |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 512 | start_zero_fsb = imap.br_startoff + imap.br_blockcount; |
| 513 | ASSERT(start_zero_fsb <= (end_zero_fsb + 1)); |
| 514 | continue; |
| 515 | } |
| 516 | |
| 517 | /* |
| 518 | * There are blocks we need to zero. |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 519 | */ |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 520 | zero_off = XFS_FSB_TO_B(mp, start_zero_fsb); |
| 521 | zero_len = XFS_FSB_TO_B(mp, imap.br_blockcount); |
| 522 | |
| 523 | if ((zero_off + zero_len) > offset) |
| 524 | zero_len = offset - zero_off; |
| 525 | |
| 526 | error = xfs_iozero(ip, zero_off, zero_len); |
Christoph Hellwig | 193aec1 | 2012-03-27 10:34:49 -0400 | [diff] [blame] | 527 | if (error) |
| 528 | return error; |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 529 | |
| 530 | start_zero_fsb = imap.br_startoff + imap.br_blockcount; |
| 531 | ASSERT(start_zero_fsb <= (end_zero_fsb + 1)); |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 532 | } |
| 533 | |
| 534 | return 0; |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 535 | } |
| 536 | |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 537 | /* |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 538 | * Common pre-write limit and setup checks. |
| 539 | * |
Christoph Hellwig | 5bf1f26 | 2011-12-18 20:00:13 +0000 | [diff] [blame] | 540 | * Called with the iolocked held either shared and exclusive according to |
| 541 | * @iolock, and returns with it held. Might upgrade the iolock to exclusive |
| 542 | * if called for a direct write beyond i_size. |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 543 | */ |
| 544 | STATIC ssize_t |
| 545 | xfs_file_aio_write_checks( |
| 546 | struct file *file, |
| 547 | loff_t *pos, |
| 548 | size_t *count, |
| 549 | int *iolock) |
| 550 | { |
| 551 | struct inode *inode = file->f_mapping->host; |
| 552 | struct xfs_inode *ip = XFS_I(inode); |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 553 | int error = 0; |
| 554 | |
Dave Chinner | 7271d24 | 2011-08-25 07:17:02 +0000 | [diff] [blame] | 555 | restart: |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 556 | error = generic_write_checks(file, pos, count, S_ISBLK(inode->i_mode)); |
Christoph Hellwig | 467f789 | 2012-03-27 10:34:47 -0400 | [diff] [blame] | 557 | if (error) |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 558 | return error; |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 559 | |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 560 | /* |
| 561 | * If the offset is beyond the size of the file, we need to zero any |
| 562 | * blocks that fall between the existing EOF and the start of this |
Christoph Hellwig | 2813d68 | 2011-12-18 20:00:12 +0000 | [diff] [blame] | 563 | * write. If zeroing is needed and we are currently holding the |
Christoph Hellwig | 467f789 | 2012-03-27 10:34:47 -0400 | [diff] [blame] | 564 | * iolock shared, we need to update it to exclusive which implies |
| 565 | * having to redo all checks before. |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 566 | */ |
Christoph Hellwig | 2813d68 | 2011-12-18 20:00:12 +0000 | [diff] [blame] | 567 | if (*pos > i_size_read(inode)) { |
Dave Chinner | 7271d24 | 2011-08-25 07:17:02 +0000 | [diff] [blame] | 568 | if (*iolock == XFS_IOLOCK_SHARED) { |
Christoph Hellwig | 467f789 | 2012-03-27 10:34:47 -0400 | [diff] [blame] | 569 | xfs_rw_iunlock(ip, *iolock); |
Dave Chinner | 7271d24 | 2011-08-25 07:17:02 +0000 | [diff] [blame] | 570 | *iolock = XFS_IOLOCK_EXCL; |
Christoph Hellwig | 467f789 | 2012-03-27 10:34:47 -0400 | [diff] [blame] | 571 | xfs_rw_ilock(ip, *iolock); |
Dave Chinner | 7271d24 | 2011-08-25 07:17:02 +0000 | [diff] [blame] | 572 | goto restart; |
| 573 | } |
Christoph Hellwig | ce7ae151 | 2011-12-18 20:00:11 +0000 | [diff] [blame] | 574 | error = -xfs_zero_eof(ip, *pos, i_size_read(inode)); |
Christoph Hellwig | 467f789 | 2012-03-27 10:34:47 -0400 | [diff] [blame] | 575 | if (error) |
| 576 | return error; |
Dave Chinner | 7271d24 | 2011-08-25 07:17:02 +0000 | [diff] [blame] | 577 | } |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 578 | |
| 579 | /* |
Christoph Hellwig | 8a9c998 | 2012-02-29 09:53:52 +0000 | [diff] [blame] | 580 | * Updating the timestamps will grab the ilock again from |
| 581 | * xfs_fs_dirty_inode, so we have to call it after dropping the |
| 582 | * lock above. Eventually we should look into a way to avoid |
| 583 | * the pointless lock roundtrip. |
| 584 | */ |
Josef Bacik | c3b2da3 | 2012-03-26 09:59:21 -0400 | [diff] [blame] | 585 | if (likely(!(file->f_mode & FMODE_NOCMTIME))) { |
| 586 | error = file_update_time(file); |
| 587 | if (error) |
| 588 | return error; |
| 589 | } |
Christoph Hellwig | 8a9c998 | 2012-02-29 09:53:52 +0000 | [diff] [blame] | 590 | |
| 591 | /* |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 592 | * If we're writing the file then make sure to clear the setuid and |
| 593 | * setgid bits if the process is not being run by root. This keeps |
| 594 | * people from modifying setuid and setgid binaries. |
| 595 | */ |
| 596 | return file_remove_suid(file); |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 597 | } |
| 598 | |
| 599 | /* |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 600 | * xfs_file_dio_aio_write - handle direct IO writes |
| 601 | * |
| 602 | * Lock the inode appropriately to prepare for and issue a direct IO write. |
Dave Chinner | eda7798 | 2011-01-11 10:22:40 +1100 | [diff] [blame] | 603 | * By separating it from the buffered write path we remove all the tricky to |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 604 | * follow locking changes and looping. |
| 605 | * |
Dave Chinner | eda7798 | 2011-01-11 10:22:40 +1100 | [diff] [blame] | 606 | * If there are cached pages or we're extending the file, we need IOLOCK_EXCL |
| 607 | * until we're sure the bytes at the new EOF have been zeroed and/or the cached |
| 608 | * pages are flushed out. |
| 609 | * |
| 610 | * In most cases the direct IO writes will be done holding IOLOCK_SHARED |
| 611 | * allowing them to be done in parallel with reads and other direct IO writes. |
| 612 | * However, if the IO is not aligned to filesystem blocks, the direct IO layer |
| 613 | * needs to do sub-block zeroing and that requires serialisation against other |
| 614 | * direct IOs to the same block. In this case we need to serialise the |
| 615 | * submission of the unaligned IOs so that we don't get racing block zeroing in |
| 616 | * the dio layer. To avoid the problem with aio, we also need to wait for |
| 617 | * outstanding IOs to complete so that unwritten extent conversion is completed |
| 618 | * before we try to map the overlapping block. This is currently implemented by |
Christoph Hellwig | 4a06fd2 | 2011-08-23 08:28:13 +0000 | [diff] [blame] | 619 | * hitting it with a big hammer (i.e. inode_dio_wait()). |
Dave Chinner | eda7798 | 2011-01-11 10:22:40 +1100 | [diff] [blame] | 620 | * |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 621 | * Returns with locks held indicated by @iolock and errors indicated by |
| 622 | * negative return values. |
| 623 | */ |
| 624 | STATIC ssize_t |
| 625 | xfs_file_dio_aio_write( |
| 626 | struct kiocb *iocb, |
| 627 | const struct iovec *iovp, |
| 628 | unsigned long nr_segs, |
| 629 | loff_t pos, |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 630 | size_t ocount) |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 631 | { |
| 632 | struct file *file = iocb->ki_filp; |
| 633 | struct address_space *mapping = file->f_mapping; |
| 634 | struct inode *inode = mapping->host; |
| 635 | struct xfs_inode *ip = XFS_I(inode); |
| 636 | struct xfs_mount *mp = ip->i_mount; |
| 637 | ssize_t ret = 0; |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 638 | size_t count = ocount; |
Dave Chinner | eda7798 | 2011-01-11 10:22:40 +1100 | [diff] [blame] | 639 | int unaligned_io = 0; |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 640 | int iolock; |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 641 | struct xfs_buftarg *target = XFS_IS_REALTIME_INODE(ip) ? |
| 642 | mp->m_rtdev_targp : mp->m_ddev_targp; |
| 643 | |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 644 | if ((pos & target->bt_smask) || (count & target->bt_smask)) |
| 645 | return -XFS_ERROR(EINVAL); |
| 646 | |
Dave Chinner | eda7798 | 2011-01-11 10:22:40 +1100 | [diff] [blame] | 647 | if ((pos & mp->m_blockmask) || ((pos + count) & mp->m_blockmask)) |
| 648 | unaligned_io = 1; |
| 649 | |
Dave Chinner | 7271d24 | 2011-08-25 07:17:02 +0000 | [diff] [blame] | 650 | /* |
| 651 | * We don't need to take an exclusive lock unless there page cache needs |
| 652 | * to be invalidated or unaligned IO is being executed. We don't need to |
| 653 | * consider the EOF extension case here because |
| 654 | * xfs_file_aio_write_checks() will relock the inode as necessary for |
| 655 | * EOF zeroing cases and fill out the new inode size as appropriate. |
| 656 | */ |
| 657 | if (unaligned_io || mapping->nrpages) |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 658 | iolock = XFS_IOLOCK_EXCL; |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 659 | else |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 660 | iolock = XFS_IOLOCK_SHARED; |
| 661 | xfs_rw_ilock(ip, iolock); |
Christoph Hellwig | c58cb16 | 2011-08-27 14:42:53 +0000 | [diff] [blame] | 662 | |
| 663 | /* |
| 664 | * Recheck if there are cached pages that need invalidate after we got |
| 665 | * the iolock to protect against other threads adding new pages while |
| 666 | * we were waiting for the iolock. |
| 667 | */ |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 668 | if (mapping->nrpages && iolock == XFS_IOLOCK_SHARED) { |
| 669 | xfs_rw_iunlock(ip, iolock); |
| 670 | iolock = XFS_IOLOCK_EXCL; |
| 671 | xfs_rw_ilock(ip, iolock); |
Christoph Hellwig | c58cb16 | 2011-08-27 14:42:53 +0000 | [diff] [blame] | 672 | } |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 673 | |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 674 | ret = xfs_file_aio_write_checks(file, &pos, &count, &iolock); |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 675 | if (ret) |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 676 | goto out; |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 677 | |
| 678 | if (mapping->nrpages) { |
Dave Chinner | fb59581 | 2012-11-12 22:53:57 +1100 | [diff] [blame] | 679 | ret = -filemap_write_and_wait_range(VFS_I(ip)->i_mapping, |
| 680 | pos, -1); |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 681 | if (ret) |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 682 | goto out; |
Dave Chinner | fb59581 | 2012-11-12 22:53:57 +1100 | [diff] [blame] | 683 | truncate_pagecache_range(VFS_I(ip), pos, -1); |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 684 | } |
| 685 | |
Dave Chinner | eda7798 | 2011-01-11 10:22:40 +1100 | [diff] [blame] | 686 | /* |
| 687 | * If we are doing unaligned IO, wait for all other IO to drain, |
| 688 | * otherwise demote the lock if we had to flush cached pages |
| 689 | */ |
| 690 | if (unaligned_io) |
Christoph Hellwig | 4a06fd2 | 2011-08-23 08:28:13 +0000 | [diff] [blame] | 691 | inode_dio_wait(inode); |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 692 | else if (iolock == XFS_IOLOCK_EXCL) { |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 693 | xfs_rw_ilock_demote(ip, XFS_IOLOCK_EXCL); |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 694 | iolock = XFS_IOLOCK_SHARED; |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 695 | } |
| 696 | |
| 697 | trace_xfs_file_direct_write(ip, count, iocb->ki_pos, 0); |
| 698 | ret = generic_file_direct_write(iocb, iovp, |
| 699 | &nr_segs, pos, &iocb->ki_pos, count, ocount); |
| 700 | |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 701 | out: |
| 702 | xfs_rw_iunlock(ip, iolock); |
| 703 | |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 704 | /* No fallback to buffered IO on errors for XFS. */ |
| 705 | ASSERT(ret < 0 || ret == count); |
| 706 | return ret; |
| 707 | } |
| 708 | |
Christoph Hellwig | 00258e3 | 2010-02-15 09:44:47 +0000 | [diff] [blame] | 709 | STATIC ssize_t |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 710 | xfs_file_buffered_aio_write( |
| 711 | struct kiocb *iocb, |
| 712 | const struct iovec *iovp, |
| 713 | unsigned long nr_segs, |
| 714 | loff_t pos, |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 715 | size_t ocount) |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 716 | { |
| 717 | struct file *file = iocb->ki_filp; |
| 718 | struct address_space *mapping = file->f_mapping; |
| 719 | struct inode *inode = mapping->host; |
| 720 | struct xfs_inode *ip = XFS_I(inode); |
| 721 | ssize_t ret; |
| 722 | int enospc = 0; |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 723 | int iolock = XFS_IOLOCK_EXCL; |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 724 | size_t count = ocount; |
| 725 | |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 726 | xfs_rw_ilock(ip, iolock); |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 727 | |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 728 | ret = xfs_file_aio_write_checks(file, &pos, &count, &iolock); |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 729 | if (ret) |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 730 | goto out; |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 731 | |
| 732 | /* We can write back this queue in page reclaim */ |
| 733 | current->backing_dev_info = mapping->backing_dev_info; |
| 734 | |
| 735 | write_retry: |
| 736 | trace_xfs_file_buffered_write(ip, count, iocb->ki_pos, 0); |
| 737 | ret = generic_file_buffered_write(iocb, iovp, nr_segs, |
Dave Chinner | 9aa0500 | 2012-10-08 21:56:04 +1100 | [diff] [blame] | 738 | pos, &iocb->ki_pos, count, 0); |
| 739 | |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 740 | /* |
Dave Chinner | 9aa0500 | 2012-10-08 21:56:04 +1100 | [diff] [blame] | 741 | * If we just got an ENOSPC, try to write back all dirty inodes to |
| 742 | * convert delalloc space to free up some of the excess reserved |
| 743 | * metadata space. |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 744 | */ |
| 745 | if (ret == -ENOSPC && !enospc) { |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 746 | enospc = 1; |
Dave Chinner | 9aa0500 | 2012-10-08 21:56:04 +1100 | [diff] [blame] | 747 | xfs_flush_inodes(ip->i_mount); |
| 748 | goto write_retry; |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 749 | } |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 750 | |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 751 | current->backing_dev_info = NULL; |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 752 | out: |
| 753 | xfs_rw_iunlock(ip, iolock); |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 754 | return ret; |
| 755 | } |
| 756 | |
| 757 | STATIC ssize_t |
Christoph Hellwig | 00258e3 | 2010-02-15 09:44:47 +0000 | [diff] [blame] | 758 | xfs_file_aio_write( |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 759 | struct kiocb *iocb, |
| 760 | const struct iovec *iovp, |
Christoph Hellwig | 00258e3 | 2010-02-15 09:44:47 +0000 | [diff] [blame] | 761 | unsigned long nr_segs, |
| 762 | loff_t pos) |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 763 | { |
| 764 | struct file *file = iocb->ki_filp; |
| 765 | struct address_space *mapping = file->f_mapping; |
| 766 | struct inode *inode = mapping->host; |
Christoph Hellwig | 00258e3 | 2010-02-15 09:44:47 +0000 | [diff] [blame] | 767 | struct xfs_inode *ip = XFS_I(inode); |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 768 | ssize_t ret; |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 769 | size_t ocount = 0; |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 770 | |
| 771 | XFS_STATS_INC(xs_write_calls); |
| 772 | |
Christoph Hellwig | 00258e3 | 2010-02-15 09:44:47 +0000 | [diff] [blame] | 773 | BUG_ON(iocb->ki_pos != pos); |
| 774 | |
Dave Chinner | a363f0c | 2011-01-11 10:13:53 +1100 | [diff] [blame] | 775 | ret = generic_segment_checks(iovp, &nr_segs, &ocount, VERIFY_READ); |
| 776 | if (ret) |
| 777 | return ret; |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 778 | |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 779 | if (ocount == 0) |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 780 | return 0; |
| 781 | |
Jan Kara | d9457dc | 2012-06-12 16:20:39 +0200 | [diff] [blame] | 782 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) { |
| 783 | ret = -EIO; |
| 784 | goto out; |
| 785 | } |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 786 | |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 787 | if (unlikely(file->f_flags & O_DIRECT)) |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 788 | ret = xfs_file_dio_aio_write(iocb, iovp, nr_segs, pos, ocount); |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 789 | else |
| 790 | ret = xfs_file_buffered_aio_write(iocb, iovp, nr_segs, pos, |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 791 | ocount); |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 792 | |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 793 | if (ret > 0) { |
| 794 | ssize_t err; |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 795 | |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 796 | XFS_STATS_ADD(xs_write_bytes, ret); |
Christoph Hellwig | ce7ae151 | 2011-12-18 20:00:11 +0000 | [diff] [blame] | 797 | |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 798 | /* Handle various SYNC-type writes */ |
| 799 | err = generic_write_sync(file, pos, ret); |
| 800 | if (err < 0) |
| 801 | ret = err; |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 802 | } |
| 803 | |
Jan Kara | d9457dc | 2012-06-12 16:20:39 +0200 | [diff] [blame] | 804 | out: |
Dave Chinner | a363f0c | 2011-01-11 10:13:53 +1100 | [diff] [blame] | 805 | return ret; |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 806 | } |
| 807 | |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 808 | STATIC long |
| 809 | xfs_file_fallocate( |
Christoph Hellwig | 83aee9e | 2013-10-12 00:55:07 -0700 | [diff] [blame] | 810 | struct file *file, |
| 811 | int mode, |
| 812 | loff_t offset, |
| 813 | loff_t len) |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 814 | { |
Christoph Hellwig | 83aee9e | 2013-10-12 00:55:07 -0700 | [diff] [blame] | 815 | struct inode *inode = file_inode(file); |
| 816 | struct xfs_inode *ip = XFS_I(inode); |
| 817 | struct xfs_trans *tp; |
| 818 | long error; |
| 819 | loff_t new_size = 0; |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 820 | |
Christoph Hellwig | 83aee9e | 2013-10-12 00:55:07 -0700 | [diff] [blame] | 821 | if (!S_ISREG(inode->i_mode)) |
| 822 | return -EINVAL; |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 823 | if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) |
| 824 | return -EOPNOTSUPP; |
| 825 | |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 826 | xfs_ilock(ip, XFS_IOLOCK_EXCL); |
Christoph Hellwig | 83aee9e | 2013-10-12 00:55:07 -0700 | [diff] [blame] | 827 | if (mode & FALLOC_FL_PUNCH_HOLE) { |
| 828 | error = xfs_free_file_space(ip, offset, len); |
| 829 | if (error) |
| 830 | goto out_unlock; |
| 831 | } else { |
| 832 | if (!(mode & FALLOC_FL_KEEP_SIZE) && |
| 833 | offset + len > i_size_read(inode)) { |
| 834 | new_size = offset + len; |
| 835 | error = -inode_newsize_ok(inode, new_size); |
| 836 | if (error) |
| 837 | goto out_unlock; |
| 838 | } |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 839 | |
Christoph Hellwig | 83aee9e | 2013-10-12 00:55:07 -0700 | [diff] [blame] | 840 | error = xfs_alloc_file_space(ip, offset, len, |
| 841 | XFS_BMAPI_PREALLOC); |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 842 | if (error) |
| 843 | goto out_unlock; |
| 844 | } |
| 845 | |
Christoph Hellwig | 83aee9e | 2013-10-12 00:55:07 -0700 | [diff] [blame] | 846 | tp = xfs_trans_alloc(ip->i_mount, XFS_TRANS_WRITEID); |
| 847 | error = xfs_trans_reserve(tp, &M_RES(ip->i_mount)->tr_writeid, 0, 0); |
| 848 | if (error) { |
| 849 | xfs_trans_cancel(tp, 0); |
| 850 | goto out_unlock; |
| 851 | } |
Dave Chinner | 8287889 | 2011-03-26 09:13:08 +1100 | [diff] [blame] | 852 | |
Christoph Hellwig | 83aee9e | 2013-10-12 00:55:07 -0700 | [diff] [blame] | 853 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
| 854 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); |
| 855 | ip->i_d.di_mode &= ~S_ISUID; |
| 856 | if (ip->i_d.di_mode & S_IXGRP) |
| 857 | ip->i_d.di_mode &= ~S_ISGID; |
| 858 | |
| 859 | if (!(mode & FALLOC_FL_PUNCH_HOLE)) |
| 860 | ip->i_d.di_flags |= XFS_DIFLAG_PREALLOC; |
| 861 | |
| 862 | xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); |
| 863 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); |
| 864 | |
| 865 | if (file->f_flags & O_DSYNC) |
| 866 | xfs_trans_set_sync(tp); |
| 867 | error = xfs_trans_commit(tp, 0); |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 868 | if (error) |
| 869 | goto out_unlock; |
| 870 | |
| 871 | /* Change file size if needed */ |
| 872 | if (new_size) { |
| 873 | struct iattr iattr; |
| 874 | |
| 875 | iattr.ia_valid = ATTR_SIZE; |
| 876 | iattr.ia_size = new_size; |
Christoph Hellwig | 83aee9e | 2013-10-12 00:55:07 -0700 | [diff] [blame] | 877 | error = xfs_setattr_size(ip, &iattr); |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 878 | } |
| 879 | |
| 880 | out_unlock: |
| 881 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); |
Christoph Hellwig | 83aee9e | 2013-10-12 00:55:07 -0700 | [diff] [blame] | 882 | return -error; |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 883 | } |
| 884 | |
| 885 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | STATIC int |
Nathan Scott | 3562fd4 | 2006-03-14 14:00:35 +1100 | [diff] [blame] | 887 | xfs_file_open( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | struct inode *inode, |
Christoph Hellwig | f999a5b | 2008-11-28 14:23:32 +1100 | [diff] [blame] | 889 | struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | { |
Christoph Hellwig | f999a5b | 2008-11-28 14:23:32 +1100 | [diff] [blame] | 891 | if (!(file->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | return -EFBIG; |
Christoph Hellwig | f999a5b | 2008-11-28 14:23:32 +1100 | [diff] [blame] | 893 | if (XFS_FORCED_SHUTDOWN(XFS_M(inode->i_sb))) |
| 894 | return -EIO; |
| 895 | return 0; |
| 896 | } |
| 897 | |
| 898 | STATIC int |
| 899 | xfs_dir_open( |
| 900 | struct inode *inode, |
| 901 | struct file *file) |
| 902 | { |
| 903 | struct xfs_inode *ip = XFS_I(inode); |
| 904 | int mode; |
| 905 | int error; |
| 906 | |
| 907 | error = xfs_file_open(inode, file); |
| 908 | if (error) |
| 909 | return error; |
| 910 | |
| 911 | /* |
| 912 | * If there are any blocks, read-ahead block 0 as we're almost |
| 913 | * certain to have the next operation be a read there. |
| 914 | */ |
| 915 | mode = xfs_ilock_map_shared(ip); |
| 916 | if (ip->i_d.di_nextents > 0) |
Dave Chinner | 33363fe | 2013-04-03 16:11:22 +1100 | [diff] [blame] | 917 | xfs_dir3_data_readahead(NULL, ip, 0, -1); |
Christoph Hellwig | f999a5b | 2008-11-28 14:23:32 +1100 | [diff] [blame] | 918 | xfs_iunlock(ip, mode); |
| 919 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | } |
| 921 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | STATIC int |
Nathan Scott | 3562fd4 | 2006-03-14 14:00:35 +1100 | [diff] [blame] | 923 | xfs_file_release( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | struct inode *inode, |
| 925 | struct file *filp) |
| 926 | { |
Christoph Hellwig | 739bfb2 | 2007-08-29 10:58:01 +1000 | [diff] [blame] | 927 | return -xfs_release(XFS_I(inode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | } |
| 929 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | STATIC int |
Nathan Scott | 3562fd4 | 2006-03-14 14:00:35 +1100 | [diff] [blame] | 931 | xfs_file_readdir( |
Al Viro | b822755 | 2013-05-22 17:07:56 -0400 | [diff] [blame] | 932 | struct file *file, |
| 933 | struct dir_context *ctx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | { |
Al Viro | b822755 | 2013-05-22 17:07:56 -0400 | [diff] [blame] | 935 | struct inode *inode = file_inode(file); |
Christoph Hellwig | 739bfb2 | 2007-08-29 10:58:01 +1000 | [diff] [blame] | 936 | xfs_inode_t *ip = XFS_I(inode); |
Christoph Hellwig | 051e7cd | 2007-08-28 13:58:24 +1000 | [diff] [blame] | 937 | int error; |
| 938 | size_t bufsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | |
Christoph Hellwig | 051e7cd | 2007-08-28 13:58:24 +1000 | [diff] [blame] | 940 | /* |
| 941 | * The Linux API doesn't pass down the total size of the buffer |
| 942 | * we read into down to the filesystem. With the filldir concept |
| 943 | * it's not needed for correct information, but the XFS dir2 leaf |
| 944 | * code wants an estimate of the buffer size to calculate it's |
| 945 | * readahead window and size the buffers used for mapping to |
| 946 | * physical blocks. |
| 947 | * |
| 948 | * Try to give it an estimate that's good enough, maybe at some |
| 949 | * point we can change the ->readdir prototype to include the |
Eric Sandeen | a9cc799 | 2010-02-03 17:50:13 +0000 | [diff] [blame] | 950 | * buffer size. For now we use the current glibc buffer size. |
Christoph Hellwig | 051e7cd | 2007-08-28 13:58:24 +1000 | [diff] [blame] | 951 | */ |
Eric Sandeen | a9cc799 | 2010-02-03 17:50:13 +0000 | [diff] [blame] | 952 | bufsize = (size_t)min_t(loff_t, 32768, ip->i_d.di_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | |
Al Viro | b822755 | 2013-05-22 17:07:56 -0400 | [diff] [blame] | 954 | error = xfs_readdir(ip, ctx, bufsize); |
Christoph Hellwig | 051e7cd | 2007-08-28 13:58:24 +1000 | [diff] [blame] | 955 | if (error) |
| 956 | return -error; |
| 957 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | } |
| 959 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | STATIC int |
Nathan Scott | 3562fd4 | 2006-03-14 14:00:35 +1100 | [diff] [blame] | 961 | xfs_file_mmap( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | struct file *filp, |
| 963 | struct vm_area_struct *vma) |
| 964 | { |
Nathan Scott | 3562fd4 | 2006-03-14 14:00:35 +1100 | [diff] [blame] | 965 | vma->vm_ops = &xfs_file_vm_ops; |
Dean Roehrich | 6fac0cb | 2005-06-21 14:07:45 +1000 | [diff] [blame] | 966 | |
Nathan Scott | fbc1462 | 2006-06-09 14:52:13 +1000 | [diff] [blame] | 967 | file_accessed(filp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | return 0; |
| 969 | } |
| 970 | |
David Chinner | 4f57dbc | 2007-07-19 16:28:17 +1000 | [diff] [blame] | 971 | /* |
| 972 | * mmap()d file has taken write protection fault and is being made |
| 973 | * writable. We can set the page state up correctly for a writable |
| 974 | * page, which means we can do correct delalloc accounting (ENOSPC |
| 975 | * checking!) and unwritten extent mapping. |
| 976 | */ |
| 977 | STATIC int |
| 978 | xfs_vm_page_mkwrite( |
| 979 | struct vm_area_struct *vma, |
Nick Piggin | c2ec175 | 2009-03-31 15:23:21 -0700 | [diff] [blame] | 980 | struct vm_fault *vmf) |
David Chinner | 4f57dbc | 2007-07-19 16:28:17 +1000 | [diff] [blame] | 981 | { |
Nick Piggin | c2ec175 | 2009-03-31 15:23:21 -0700 | [diff] [blame] | 982 | return block_page_mkwrite(vma, vmf, xfs_get_blocks); |
David Chinner | 4f57dbc | 2007-07-19 16:28:17 +1000 | [diff] [blame] | 983 | } |
| 984 | |
Jeff Liu | d126d43 | 2012-08-21 17:11:57 +0800 | [diff] [blame] | 985 | /* |
| 986 | * This type is designed to indicate the type of offset we would like |
| 987 | * to search from page cache for either xfs_seek_data() or xfs_seek_hole(). |
| 988 | */ |
| 989 | enum { |
| 990 | HOLE_OFF = 0, |
| 991 | DATA_OFF, |
| 992 | }; |
| 993 | |
| 994 | /* |
| 995 | * Lookup the desired type of offset from the given page. |
| 996 | * |
| 997 | * On success, return true and the offset argument will point to the |
| 998 | * start of the region that was found. Otherwise this function will |
| 999 | * return false and keep the offset argument unchanged. |
| 1000 | */ |
| 1001 | STATIC bool |
| 1002 | xfs_lookup_buffer_offset( |
| 1003 | struct page *page, |
| 1004 | loff_t *offset, |
| 1005 | unsigned int type) |
| 1006 | { |
| 1007 | loff_t lastoff = page_offset(page); |
| 1008 | bool found = false; |
| 1009 | struct buffer_head *bh, *head; |
| 1010 | |
| 1011 | bh = head = page_buffers(page); |
| 1012 | do { |
| 1013 | /* |
| 1014 | * Unwritten extents that have data in the page |
| 1015 | * cache covering them can be identified by the |
| 1016 | * BH_Unwritten state flag. Pages with multiple |
| 1017 | * buffers might have a mix of holes, data and |
| 1018 | * unwritten extents - any buffer with valid |
| 1019 | * data in it should have BH_Uptodate flag set |
| 1020 | * on it. |
| 1021 | */ |
| 1022 | if (buffer_unwritten(bh) || |
| 1023 | buffer_uptodate(bh)) { |
| 1024 | if (type == DATA_OFF) |
| 1025 | found = true; |
| 1026 | } else { |
| 1027 | if (type == HOLE_OFF) |
| 1028 | found = true; |
| 1029 | } |
| 1030 | |
| 1031 | if (found) { |
| 1032 | *offset = lastoff; |
| 1033 | break; |
| 1034 | } |
| 1035 | lastoff += bh->b_size; |
| 1036 | } while ((bh = bh->b_this_page) != head); |
| 1037 | |
| 1038 | return found; |
| 1039 | } |
| 1040 | |
| 1041 | /* |
| 1042 | * This routine is called to find out and return a data or hole offset |
| 1043 | * from the page cache for unwritten extents according to the desired |
| 1044 | * type for xfs_seek_data() or xfs_seek_hole(). |
| 1045 | * |
| 1046 | * The argument offset is used to tell where we start to search from the |
| 1047 | * page cache. Map is used to figure out the end points of the range to |
| 1048 | * lookup pages. |
| 1049 | * |
| 1050 | * Return true if the desired type of offset was found, and the argument |
| 1051 | * offset is filled with that address. Otherwise, return false and keep |
| 1052 | * offset unchanged. |
| 1053 | */ |
| 1054 | STATIC bool |
| 1055 | xfs_find_get_desired_pgoff( |
| 1056 | struct inode *inode, |
| 1057 | struct xfs_bmbt_irec *map, |
| 1058 | unsigned int type, |
| 1059 | loff_t *offset) |
| 1060 | { |
| 1061 | struct xfs_inode *ip = XFS_I(inode); |
| 1062 | struct xfs_mount *mp = ip->i_mount; |
| 1063 | struct pagevec pvec; |
| 1064 | pgoff_t index; |
| 1065 | pgoff_t end; |
| 1066 | loff_t endoff; |
| 1067 | loff_t startoff = *offset; |
| 1068 | loff_t lastoff = startoff; |
| 1069 | bool found = false; |
| 1070 | |
| 1071 | pagevec_init(&pvec, 0); |
| 1072 | |
| 1073 | index = startoff >> PAGE_CACHE_SHIFT; |
| 1074 | endoff = XFS_FSB_TO_B(mp, map->br_startoff + map->br_blockcount); |
| 1075 | end = endoff >> PAGE_CACHE_SHIFT; |
| 1076 | do { |
| 1077 | int want; |
| 1078 | unsigned nr_pages; |
| 1079 | unsigned int i; |
| 1080 | |
| 1081 | want = min_t(pgoff_t, end - index, PAGEVEC_SIZE); |
| 1082 | nr_pages = pagevec_lookup(&pvec, inode->i_mapping, index, |
| 1083 | want); |
| 1084 | /* |
| 1085 | * No page mapped into given range. If we are searching holes |
| 1086 | * and if this is the first time we got into the loop, it means |
| 1087 | * that the given offset is landed in a hole, return it. |
| 1088 | * |
| 1089 | * If we have already stepped through some block buffers to find |
| 1090 | * holes but they all contains data. In this case, the last |
| 1091 | * offset is already updated and pointed to the end of the last |
| 1092 | * mapped page, if it does not reach the endpoint to search, |
| 1093 | * that means there should be a hole between them. |
| 1094 | */ |
| 1095 | if (nr_pages == 0) { |
| 1096 | /* Data search found nothing */ |
| 1097 | if (type == DATA_OFF) |
| 1098 | break; |
| 1099 | |
| 1100 | ASSERT(type == HOLE_OFF); |
| 1101 | if (lastoff == startoff || lastoff < endoff) { |
| 1102 | found = true; |
| 1103 | *offset = lastoff; |
| 1104 | } |
| 1105 | break; |
| 1106 | } |
| 1107 | |
| 1108 | /* |
| 1109 | * At lease we found one page. If this is the first time we |
| 1110 | * step into the loop, and if the first page index offset is |
| 1111 | * greater than the given search offset, a hole was found. |
| 1112 | */ |
| 1113 | if (type == HOLE_OFF && lastoff == startoff && |
| 1114 | lastoff < page_offset(pvec.pages[0])) { |
| 1115 | found = true; |
| 1116 | break; |
| 1117 | } |
| 1118 | |
| 1119 | for (i = 0; i < nr_pages; i++) { |
| 1120 | struct page *page = pvec.pages[i]; |
| 1121 | loff_t b_offset; |
| 1122 | |
| 1123 | /* |
| 1124 | * At this point, the page may be truncated or |
| 1125 | * invalidated (changing page->mapping to NULL), |
| 1126 | * or even swizzled back from swapper_space to tmpfs |
| 1127 | * file mapping. However, page->index will not change |
| 1128 | * because we have a reference on the page. |
| 1129 | * |
| 1130 | * Searching done if the page index is out of range. |
| 1131 | * If the current offset is not reaches the end of |
| 1132 | * the specified search range, there should be a hole |
| 1133 | * between them. |
| 1134 | */ |
| 1135 | if (page->index > end) { |
| 1136 | if (type == HOLE_OFF && lastoff < endoff) { |
| 1137 | *offset = lastoff; |
| 1138 | found = true; |
| 1139 | } |
| 1140 | goto out; |
| 1141 | } |
| 1142 | |
| 1143 | lock_page(page); |
| 1144 | /* |
| 1145 | * Page truncated or invalidated(page->mapping == NULL). |
| 1146 | * We can freely skip it and proceed to check the next |
| 1147 | * page. |
| 1148 | */ |
| 1149 | if (unlikely(page->mapping != inode->i_mapping)) { |
| 1150 | unlock_page(page); |
| 1151 | continue; |
| 1152 | } |
| 1153 | |
| 1154 | if (!page_has_buffers(page)) { |
| 1155 | unlock_page(page); |
| 1156 | continue; |
| 1157 | } |
| 1158 | |
| 1159 | found = xfs_lookup_buffer_offset(page, &b_offset, type); |
| 1160 | if (found) { |
| 1161 | /* |
| 1162 | * The found offset may be less than the start |
| 1163 | * point to search if this is the first time to |
| 1164 | * come here. |
| 1165 | */ |
| 1166 | *offset = max_t(loff_t, startoff, b_offset); |
| 1167 | unlock_page(page); |
| 1168 | goto out; |
| 1169 | } |
| 1170 | |
| 1171 | /* |
| 1172 | * We either searching data but nothing was found, or |
| 1173 | * searching hole but found a data buffer. In either |
| 1174 | * case, probably the next page contains the desired |
| 1175 | * things, update the last offset to it so. |
| 1176 | */ |
| 1177 | lastoff = page_offset(page) + PAGE_SIZE; |
| 1178 | unlock_page(page); |
| 1179 | } |
| 1180 | |
| 1181 | /* |
| 1182 | * The number of returned pages less than our desired, search |
| 1183 | * done. In this case, nothing was found for searching data, |
| 1184 | * but we found a hole behind the last offset. |
| 1185 | */ |
| 1186 | if (nr_pages < want) { |
| 1187 | if (type == HOLE_OFF) { |
| 1188 | *offset = lastoff; |
| 1189 | found = true; |
| 1190 | } |
| 1191 | break; |
| 1192 | } |
| 1193 | |
| 1194 | index = pvec.pages[i - 1]->index + 1; |
| 1195 | pagevec_release(&pvec); |
| 1196 | } while (index <= end); |
| 1197 | |
| 1198 | out: |
| 1199 | pagevec_release(&pvec); |
| 1200 | return found; |
| 1201 | } |
| 1202 | |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1203 | STATIC loff_t |
| 1204 | xfs_seek_data( |
| 1205 | struct file *file, |
Jeff Liu | 834ab12 | 2012-08-21 17:11:45 +0800 | [diff] [blame] | 1206 | loff_t start) |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1207 | { |
| 1208 | struct inode *inode = file->f_mapping->host; |
| 1209 | struct xfs_inode *ip = XFS_I(inode); |
| 1210 | struct xfs_mount *mp = ip->i_mount; |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1211 | loff_t uninitialized_var(offset); |
| 1212 | xfs_fsize_t isize; |
| 1213 | xfs_fileoff_t fsbno; |
| 1214 | xfs_filblks_t end; |
| 1215 | uint lock; |
| 1216 | int error; |
| 1217 | |
| 1218 | lock = xfs_ilock_map_shared(ip); |
| 1219 | |
| 1220 | isize = i_size_read(inode); |
| 1221 | if (start >= isize) { |
| 1222 | error = ENXIO; |
| 1223 | goto out_unlock; |
| 1224 | } |
| 1225 | |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1226 | /* |
| 1227 | * Try to read extents from the first block indicated |
| 1228 | * by fsbno to the end block of the file. |
| 1229 | */ |
Jeff Liu | 52f1acc | 2012-08-21 17:12:07 +0800 | [diff] [blame] | 1230 | fsbno = XFS_B_TO_FSBT(mp, start); |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1231 | end = XFS_B_TO_FSB(mp, isize); |
Jeff Liu | 52f1acc | 2012-08-21 17:12:07 +0800 | [diff] [blame] | 1232 | for (;;) { |
| 1233 | struct xfs_bmbt_irec map[2]; |
| 1234 | int nmap = 2; |
| 1235 | unsigned int i; |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1236 | |
Jeff Liu | 52f1acc | 2012-08-21 17:12:07 +0800 | [diff] [blame] | 1237 | error = xfs_bmapi_read(ip, fsbno, end - fsbno, map, &nmap, |
| 1238 | XFS_BMAPI_ENTIRE); |
| 1239 | if (error) |
| 1240 | goto out_unlock; |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1241 | |
Jeff Liu | 52f1acc | 2012-08-21 17:12:07 +0800 | [diff] [blame] | 1242 | /* No extents at given offset, must be beyond EOF */ |
| 1243 | if (nmap == 0) { |
| 1244 | error = ENXIO; |
| 1245 | goto out_unlock; |
| 1246 | } |
| 1247 | |
| 1248 | for (i = 0; i < nmap; i++) { |
| 1249 | offset = max_t(loff_t, start, |
| 1250 | XFS_FSB_TO_B(mp, map[i].br_startoff)); |
| 1251 | |
| 1252 | /* Landed in a data extent */ |
| 1253 | if (map[i].br_startblock == DELAYSTARTBLOCK || |
| 1254 | (map[i].br_state == XFS_EXT_NORM && |
| 1255 | !isnullstartblock(map[i].br_startblock))) |
| 1256 | goto out; |
| 1257 | |
| 1258 | /* |
| 1259 | * Landed in an unwritten extent, try to search data |
| 1260 | * from page cache. |
| 1261 | */ |
| 1262 | if (map[i].br_state == XFS_EXT_UNWRITTEN) { |
| 1263 | if (xfs_find_get_desired_pgoff(inode, &map[i], |
| 1264 | DATA_OFF, &offset)) |
| 1265 | goto out; |
| 1266 | } |
| 1267 | } |
| 1268 | |
| 1269 | /* |
| 1270 | * map[0] is hole or its an unwritten extent but |
| 1271 | * without data in page cache. Probably means that |
| 1272 | * we are reading after EOF if nothing in map[1]. |
| 1273 | */ |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1274 | if (nmap == 1) { |
| 1275 | error = ENXIO; |
| 1276 | goto out_unlock; |
| 1277 | } |
| 1278 | |
Jeff Liu | 52f1acc | 2012-08-21 17:12:07 +0800 | [diff] [blame] | 1279 | ASSERT(i > 1); |
| 1280 | |
| 1281 | /* |
| 1282 | * Nothing was found, proceed to the next round of search |
| 1283 | * if reading offset not beyond or hit EOF. |
| 1284 | */ |
| 1285 | fsbno = map[i - 1].br_startoff + map[i - 1].br_blockcount; |
| 1286 | start = XFS_FSB_TO_B(mp, fsbno); |
| 1287 | if (start >= isize) { |
| 1288 | error = ENXIO; |
| 1289 | goto out_unlock; |
| 1290 | } |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1291 | } |
| 1292 | |
Jeff Liu | 52f1acc | 2012-08-21 17:12:07 +0800 | [diff] [blame] | 1293 | out: |
Jie Liu | 46a1c2c | 2013-06-25 12:02:13 +0800 | [diff] [blame] | 1294 | offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes); |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1295 | |
| 1296 | out_unlock: |
Christoph Hellwig | 01f4f32 | 2013-12-06 12:30:08 -0800 | [diff] [blame^] | 1297 | xfs_iunlock(ip, lock); |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1298 | |
| 1299 | if (error) |
| 1300 | return -error; |
| 1301 | return offset; |
| 1302 | } |
| 1303 | |
| 1304 | STATIC loff_t |
| 1305 | xfs_seek_hole( |
| 1306 | struct file *file, |
Jeff Liu | 834ab12 | 2012-08-21 17:11:45 +0800 | [diff] [blame] | 1307 | loff_t start) |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1308 | { |
| 1309 | struct inode *inode = file->f_mapping->host; |
| 1310 | struct xfs_inode *ip = XFS_I(inode); |
| 1311 | struct xfs_mount *mp = ip->i_mount; |
| 1312 | loff_t uninitialized_var(offset); |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1313 | xfs_fsize_t isize; |
| 1314 | xfs_fileoff_t fsbno; |
Jeff Liu | b686d1f | 2012-08-21 17:12:18 +0800 | [diff] [blame] | 1315 | xfs_filblks_t end; |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1316 | uint lock; |
| 1317 | int error; |
| 1318 | |
| 1319 | if (XFS_FORCED_SHUTDOWN(mp)) |
| 1320 | return -XFS_ERROR(EIO); |
| 1321 | |
| 1322 | lock = xfs_ilock_map_shared(ip); |
| 1323 | |
| 1324 | isize = i_size_read(inode); |
| 1325 | if (start >= isize) { |
| 1326 | error = ENXIO; |
| 1327 | goto out_unlock; |
| 1328 | } |
| 1329 | |
| 1330 | fsbno = XFS_B_TO_FSBT(mp, start); |
Jeff Liu | b686d1f | 2012-08-21 17:12:18 +0800 | [diff] [blame] | 1331 | end = XFS_B_TO_FSB(mp, isize); |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1332 | |
Jeff Liu | b686d1f | 2012-08-21 17:12:18 +0800 | [diff] [blame] | 1333 | for (;;) { |
| 1334 | struct xfs_bmbt_irec map[2]; |
| 1335 | int nmap = 2; |
| 1336 | unsigned int i; |
| 1337 | |
| 1338 | error = xfs_bmapi_read(ip, fsbno, end - fsbno, map, &nmap, |
| 1339 | XFS_BMAPI_ENTIRE); |
| 1340 | if (error) |
| 1341 | goto out_unlock; |
| 1342 | |
| 1343 | /* No extents at given offset, must be beyond EOF */ |
| 1344 | if (nmap == 0) { |
| 1345 | error = ENXIO; |
| 1346 | goto out_unlock; |
| 1347 | } |
| 1348 | |
| 1349 | for (i = 0; i < nmap; i++) { |
| 1350 | offset = max_t(loff_t, start, |
| 1351 | XFS_FSB_TO_B(mp, map[i].br_startoff)); |
| 1352 | |
| 1353 | /* Landed in a hole */ |
| 1354 | if (map[i].br_startblock == HOLESTARTBLOCK) |
| 1355 | goto out; |
| 1356 | |
| 1357 | /* |
| 1358 | * Landed in an unwritten extent, try to search hole |
| 1359 | * from page cache. |
| 1360 | */ |
| 1361 | if (map[i].br_state == XFS_EXT_UNWRITTEN) { |
| 1362 | if (xfs_find_get_desired_pgoff(inode, &map[i], |
| 1363 | HOLE_OFF, &offset)) |
| 1364 | goto out; |
| 1365 | } |
| 1366 | } |
| 1367 | |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1368 | /* |
Jeff Liu | b686d1f | 2012-08-21 17:12:18 +0800 | [diff] [blame] | 1369 | * map[0] contains data or its unwritten but contains |
| 1370 | * data in page cache, probably means that we are |
| 1371 | * reading after EOF. We should fix offset to point |
| 1372 | * to the end of the file(i.e., there is an implicit |
| 1373 | * hole at the end of any file). |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1374 | */ |
Jeff Liu | b686d1f | 2012-08-21 17:12:18 +0800 | [diff] [blame] | 1375 | if (nmap == 1) { |
| 1376 | offset = isize; |
| 1377 | break; |
| 1378 | } |
| 1379 | |
| 1380 | ASSERT(i > 1); |
| 1381 | |
| 1382 | /* |
| 1383 | * Both mappings contains data, proceed to the next round of |
| 1384 | * search if the current reading offset not beyond or hit EOF. |
| 1385 | */ |
| 1386 | fsbno = map[i - 1].br_startoff + map[i - 1].br_blockcount; |
| 1387 | start = XFS_FSB_TO_B(mp, fsbno); |
| 1388 | if (start >= isize) { |
| 1389 | offset = isize; |
| 1390 | break; |
| 1391 | } |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1392 | } |
| 1393 | |
Jeff Liu | b686d1f | 2012-08-21 17:12:18 +0800 | [diff] [blame] | 1394 | out: |
| 1395 | /* |
| 1396 | * At this point, we must have found a hole. However, the returned |
| 1397 | * offset may be bigger than the file size as it may be aligned to |
| 1398 | * page boundary for unwritten extents, we need to deal with this |
| 1399 | * situation in particular. |
| 1400 | */ |
| 1401 | offset = min_t(loff_t, offset, isize); |
Jie Liu | 46a1c2c | 2013-06-25 12:02:13 +0800 | [diff] [blame] | 1402 | offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes); |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1403 | |
| 1404 | out_unlock: |
Christoph Hellwig | 01f4f32 | 2013-12-06 12:30:08 -0800 | [diff] [blame^] | 1405 | xfs_iunlock(ip, lock); |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1406 | |
| 1407 | if (error) |
| 1408 | return -error; |
| 1409 | return offset; |
| 1410 | } |
| 1411 | |
| 1412 | STATIC loff_t |
| 1413 | xfs_file_llseek( |
| 1414 | struct file *file, |
| 1415 | loff_t offset, |
| 1416 | int origin) |
| 1417 | { |
| 1418 | switch (origin) { |
| 1419 | case SEEK_END: |
| 1420 | case SEEK_CUR: |
| 1421 | case SEEK_SET: |
| 1422 | return generic_file_llseek(file, offset, origin); |
| 1423 | case SEEK_DATA: |
Jeff Liu | 834ab12 | 2012-08-21 17:11:45 +0800 | [diff] [blame] | 1424 | return xfs_seek_data(file, offset); |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1425 | case SEEK_HOLE: |
Jeff Liu | 834ab12 | 2012-08-21 17:11:45 +0800 | [diff] [blame] | 1426 | return xfs_seek_hole(file, offset); |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1427 | default: |
| 1428 | return -EINVAL; |
| 1429 | } |
| 1430 | } |
| 1431 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 1432 | const struct file_operations xfs_file_operations = { |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1433 | .llseek = xfs_file_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1434 | .read = do_sync_read, |
Dean Roehrich | bb3f724 | 2005-09-02 15:43:05 +1000 | [diff] [blame] | 1435 | .write = do_sync_write, |
Nathan Scott | 3562fd4 | 2006-03-14 14:00:35 +1100 | [diff] [blame] | 1436 | .aio_read = xfs_file_aio_read, |
| 1437 | .aio_write = xfs_file_aio_write, |
Nathan Scott | 1b89584 | 2006-03-31 13:08:59 +1000 | [diff] [blame] | 1438 | .splice_read = xfs_file_splice_read, |
| 1439 | .splice_write = xfs_file_splice_write, |
Nathan Scott | 3562fd4 | 2006-03-14 14:00:35 +1100 | [diff] [blame] | 1440 | .unlocked_ioctl = xfs_file_ioctl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1441 | #ifdef CONFIG_COMPAT |
Nathan Scott | 3562fd4 | 2006-03-14 14:00:35 +1100 | [diff] [blame] | 1442 | .compat_ioctl = xfs_file_compat_ioctl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1443 | #endif |
Nathan Scott | 3562fd4 | 2006-03-14 14:00:35 +1100 | [diff] [blame] | 1444 | .mmap = xfs_file_mmap, |
| 1445 | .open = xfs_file_open, |
| 1446 | .release = xfs_file_release, |
| 1447 | .fsync = xfs_file_fsync, |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 1448 | .fallocate = xfs_file_fallocate, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1449 | }; |
| 1450 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 1451 | const struct file_operations xfs_dir_file_operations = { |
Christoph Hellwig | f999a5b | 2008-11-28 14:23:32 +1100 | [diff] [blame] | 1452 | .open = xfs_dir_open, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1453 | .read = generic_read_dir, |
Al Viro | b822755 | 2013-05-22 17:07:56 -0400 | [diff] [blame] | 1454 | .iterate = xfs_file_readdir, |
Al Viro | 59af158 | 2008-08-24 07:24:41 -0400 | [diff] [blame] | 1455 | .llseek = generic_file_llseek, |
Nathan Scott | 3562fd4 | 2006-03-14 14:00:35 +1100 | [diff] [blame] | 1456 | .unlocked_ioctl = xfs_file_ioctl, |
Nathan Scott | d387039 | 2005-05-06 06:44:46 -0700 | [diff] [blame] | 1457 | #ifdef CONFIG_COMPAT |
Nathan Scott | 3562fd4 | 2006-03-14 14:00:35 +1100 | [diff] [blame] | 1458 | .compat_ioctl = xfs_file_compat_ioctl, |
Nathan Scott | d387039 | 2005-05-06 06:44:46 -0700 | [diff] [blame] | 1459 | #endif |
Christoph Hellwig | 1da2f2d | 2011-10-02 14:25:16 +0000 | [diff] [blame] | 1460 | .fsync = xfs_dir_fsync, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1461 | }; |
| 1462 | |
Alexey Dobriyan | f0f37e2 | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 1463 | static const struct vm_operations_struct xfs_file_vm_ops = { |
Nick Piggin | 54cb882 | 2007-07-19 01:46:59 -0700 | [diff] [blame] | 1464 | .fault = filemap_fault, |
David Chinner | 4f57dbc | 2007-07-19 16:28:17 +1000 | [diff] [blame] | 1465 | .page_mkwrite = xfs_vm_page_mkwrite, |
Konstantin Khlebnikov | 0b173bc | 2012-10-08 16:28:46 -0700 | [diff] [blame] | 1466 | .remap_pages = generic_file_remap_pages, |
Dean Roehrich | 6fac0cb | 2005-06-21 14:07:45 +1000 | [diff] [blame] | 1467 | }; |