Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
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 | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
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. | |
1da177e4 | 13 | * |
7b718769 NS |
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 | |
1da177e4 | 17 | */ |
1da177e4 | 18 | #include "xfs.h" |
1da177e4 | 19 | #include "xfs_fs.h" |
a844f451 | 20 | #include "xfs_bit.h" |
1da177e4 | 21 | #include "xfs_log.h" |
a844f451 | 22 | #include "xfs_inum.h" |
1da177e4 LT |
23 | #include "xfs_trans.h" |
24 | #include "xfs_sb.h" | |
25 | #include "xfs_ag.h" | |
1da177e4 LT |
26 | #include "xfs_dir2.h" |
27 | #include "xfs_alloc.h" | |
28 | #include "xfs_dmapi.h" | |
29 | #include "xfs_quota.h" | |
30 | #include "xfs_mount.h" | |
1da177e4 | 31 | #include "xfs_bmap_btree.h" |
a844f451 | 32 | #include "xfs_alloc_btree.h" |
1da177e4 | 33 | #include "xfs_ialloc_btree.h" |
1da177e4 | 34 | #include "xfs_dir2_sf.h" |
a844f451 | 35 | #include "xfs_attr_sf.h" |
1da177e4 LT |
36 | #include "xfs_dinode.h" |
37 | #include "xfs_inode.h" | |
38 | #include "xfs_bmap.h" | |
a844f451 NS |
39 | #include "xfs_btree.h" |
40 | #include "xfs_ialloc.h" | |
1da177e4 LT |
41 | #include "xfs_rtalloc.h" |
42 | #include "xfs_error.h" | |
43 | #include "xfs_itable.h" | |
44 | #include "xfs_rw.h" | |
1da177e4 LT |
45 | #include "xfs_attr.h" |
46 | #include "xfs_inode_item.h" | |
47 | #include "xfs_buf_item.h" | |
48 | #include "xfs_utils.h" | |
49 | #include "xfs_iomap.h" | |
993386c1 | 50 | #include "xfs_vnodeops.h" |
1da177e4 LT |
51 | |
52 | #include <linux/capability.h> | |
53 | #include <linux/writeback.h> | |
54 | ||
55 | ||
56 | #if defined(XFS_RW_TRACE) | |
57 | void | |
58 | xfs_rw_enter_trace( | |
59 | int tag, | |
613d7043 | 60 | xfs_inode_t *ip, |
1da177e4 LT |
61 | void *data, |
62 | size_t segs, | |
63 | loff_t offset, | |
64 | int ioflags) | |
65 | { | |
1da177e4 LT |
66 | if (ip->i_rwtrace == NULL) |
67 | return; | |
68 | ktrace_enter(ip->i_rwtrace, | |
69 | (void *)(unsigned long)tag, | |
70 | (void *)ip, | |
71 | (void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)), | |
72 | (void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)), | |
73 | (void *)data, | |
74 | (void *)((unsigned long)segs), | |
75 | (void *)((unsigned long)((offset >> 32) & 0xffffffff)), | |
76 | (void *)((unsigned long)(offset & 0xffffffff)), | |
77 | (void *)((unsigned long)ioflags), | |
613d7043 CH |
78 | (void *)((unsigned long)((ip->i_new_size >> 32) & 0xffffffff)), |
79 | (void *)((unsigned long)(ip->i_new_size & 0xffffffff)), | |
f1fdc848 | 80 | (void *)((unsigned long)current_pid()), |
1da177e4 LT |
81 | (void *)NULL, |
82 | (void *)NULL, | |
83 | (void *)NULL, | |
84 | (void *)NULL); | |
85 | } | |
86 | ||
87 | void | |
88 | xfs_inval_cached_trace( | |
613d7043 | 89 | xfs_inode_t *ip, |
1da177e4 LT |
90 | xfs_off_t offset, |
91 | xfs_off_t len, | |
92 | xfs_off_t first, | |
93 | xfs_off_t last) | |
94 | { | |
1da177e4 LT |
95 | |
96 | if (ip->i_rwtrace == NULL) | |
97 | return; | |
98 | ktrace_enter(ip->i_rwtrace, | |
99 | (void *)(__psint_t)XFS_INVAL_CACHED, | |
100 | (void *)ip, | |
101 | (void *)((unsigned long)((offset >> 32) & 0xffffffff)), | |
102 | (void *)((unsigned long)(offset & 0xffffffff)), | |
103 | (void *)((unsigned long)((len >> 32) & 0xffffffff)), | |
104 | (void *)((unsigned long)(len & 0xffffffff)), | |
105 | (void *)((unsigned long)((first >> 32) & 0xffffffff)), | |
106 | (void *)((unsigned long)(first & 0xffffffff)), | |
107 | (void *)((unsigned long)((last >> 32) & 0xffffffff)), | |
108 | (void *)((unsigned long)(last & 0xffffffff)), | |
f1fdc848 | 109 | (void *)((unsigned long)current_pid()), |
1da177e4 LT |
110 | (void *)NULL, |
111 | (void *)NULL, | |
112 | (void *)NULL, | |
113 | (void *)NULL, | |
114 | (void *)NULL); | |
115 | } | |
116 | #endif | |
117 | ||
118 | /* | |
119 | * xfs_iozero | |
120 | * | |
121 | * xfs_iozero clears the specified range of buffer supplied, | |
122 | * and marks all the affected blocks as valid and modified. If | |
123 | * an affected block is not allocated, it will be allocated. If | |
124 | * an affected block is not completely overwritten, and is not | |
125 | * valid before the operation, it will be read from disk before | |
126 | * being partially zeroed. | |
127 | */ | |
128 | STATIC int | |
129 | xfs_iozero( | |
541d7d3c | 130 | struct xfs_inode *ip, /* inode */ |
1da177e4 | 131 | loff_t pos, /* offset in file */ |
68160161 | 132 | size_t count) /* size of data to zero */ |
1da177e4 | 133 | { |
1da177e4 LT |
134 | struct page *page; |
135 | struct address_space *mapping; | |
1da177e4 LT |
136 | int status; |
137 | ||
01651646 | 138 | mapping = VFS_I(ip)->i_mapping; |
1da177e4 | 139 | do { |
d79689c7 NP |
140 | unsigned offset, bytes; |
141 | void *fsdata; | |
1da177e4 LT |
142 | |
143 | offset = (pos & (PAGE_CACHE_SIZE -1)); /* Within page */ | |
1da177e4 LT |
144 | bytes = PAGE_CACHE_SIZE - offset; |
145 | if (bytes > count) | |
146 | bytes = count; | |
147 | ||
d79689c7 NP |
148 | status = pagecache_write_begin(NULL, mapping, pos, bytes, |
149 | AOP_FLAG_UNINTERRUPTIBLE, | |
150 | &page, &fsdata); | |
e7ff6aed | 151 | if (status) |
d79689c7 | 152 | break; |
1da177e4 | 153 | |
eebd2aa3 | 154 | zero_user(page, offset, bytes); |
e7ff6aed | 155 | |
d79689c7 NP |
156 | status = pagecache_write_end(NULL, mapping, pos, bytes, bytes, |
157 | page, fsdata); | |
158 | WARN_ON(status <= 0); /* can't return less than zero! */ | |
159 | pos += bytes; | |
160 | count -= bytes; | |
161 | status = 0; | |
1da177e4 LT |
162 | } while (count); |
163 | ||
164 | return (-status); | |
165 | } | |
166 | ||
1da177e4 LT |
167 | ssize_t /* bytes read, or (-) error */ |
168 | xfs_read( | |
993386c1 | 169 | xfs_inode_t *ip, |
1da177e4 LT |
170 | struct kiocb *iocb, |
171 | const struct iovec *iovp, | |
172 | unsigned int segs, | |
173 | loff_t *offset, | |
993386c1 | 174 | int ioflags) |
1da177e4 LT |
175 | { |
176 | struct file *file = iocb->ki_filp; | |
177 | struct inode *inode = file->f_mapping->host; | |
993386c1 | 178 | xfs_mount_t *mp = ip->i_mount; |
1da177e4 | 179 | size_t size = 0; |
d3cf2094 | 180 | ssize_t ret = 0; |
1da177e4 | 181 | xfs_fsize_t n; |
1da177e4 LT |
182 | unsigned long seg; |
183 | ||
1da177e4 LT |
184 | |
185 | XFS_STATS_INC(xs_read_calls); | |
186 | ||
187 | /* START copy & waste from filemap.c */ | |
188 | for (seg = 0; seg < segs; seg++) { | |
189 | const struct iovec *iv = &iovp[seg]; | |
190 | ||
191 | /* | |
192 | * If any segment has a negative length, or the cumulative | |
193 | * length ever wraps negative then return -EINVAL. | |
194 | */ | |
195 | size += iv->iov_len; | |
196 | if (unlikely((ssize_t)(size|iv->iov_len) < 0)) | |
197 | return XFS_ERROR(-EINVAL); | |
198 | } | |
199 | /* END copy & waste from filemap.c */ | |
200 | ||
201 | if (unlikely(ioflags & IO_ISDIRECT)) { | |
202 | xfs_buftarg_t *target = | |
71ddabb9 | 203 | XFS_IS_REALTIME_INODE(ip) ? |
1da177e4 | 204 | mp->m_rtdev_targp : mp->m_ddev_targp; |
ce8e922c NS |
205 | if ((*offset & target->bt_smask) || |
206 | (size & target->bt_smask)) { | |
ba87ea69 | 207 | if (*offset == ip->i_size) { |
1da177e4 LT |
208 | return (0); |
209 | } | |
210 | return -XFS_ERROR(EINVAL); | |
211 | } | |
212 | } | |
213 | ||
214 | n = XFS_MAXIOFFSET(mp) - *offset; | |
215 | if ((n <= 0) || (size == 0)) | |
216 | return 0; | |
217 | ||
218 | if (n < size) | |
219 | size = n; | |
220 | ||
a13828b1 | 221 | if (XFS_FORCED_SHUTDOWN(mp)) |
1da177e4 | 222 | return -EIO; |
1da177e4 LT |
223 | |
224 | if (unlikely(ioflags & IO_ISDIRECT)) | |
1b1dcc1b | 225 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
226 | xfs_ilock(ip, XFS_IOLOCK_SHARED); |
227 | ||
eb9df39d | 228 | if (DM_EVENT_ENABLED(ip, DM_EVENT_READ) && !(ioflags & IO_INVIS)) { |
e1a40fa9 | 229 | int dmflags = FILP_DELAY_FLAG(file) | DM_SEM_FLAG_RD(ioflags); |
126468b1 | 230 | int iolock = XFS_IOLOCK_SHARED; |
1da177e4 | 231 | |
bc4ac74a | 232 | ret = -XFS_SEND_DATA(mp, DM_EVENT_READ, ip, *offset, size, |
126468b1 | 233 | dmflags, &iolock); |
1da177e4 LT |
234 | if (ret) { |
235 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); | |
721259bc LM |
236 | if (unlikely(ioflags & IO_ISDIRECT)) |
237 | mutex_unlock(&inode->i_mutex); | |
238 | return ret; | |
1da177e4 LT |
239 | } |
240 | } | |
241 | ||
edcd4bce | 242 | if (unlikely(ioflags & IO_ISDIRECT)) { |
dcf49cc5 | 243 | if (inode->i_mapping->nrpages) |
2e656092 | 244 | ret = -xfs_flushinval_pages(ip, (*offset & PAGE_CACHE_MASK), |
e6a4b37f | 245 | -1, FI_REMAPF_LOCKED); |
721259bc | 246 | mutex_unlock(&inode->i_mutex); |
d3cf2094 LM |
247 | if (ret) { |
248 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); | |
249 | return ret; | |
250 | } | |
edcd4bce | 251 | } |
721259bc | 252 | |
613d7043 | 253 | xfs_rw_enter_trace(XFS_READ_ENTER, ip, |
1da177e4 | 254 | (void *)iovp, segs, *offset, ioflags); |
543ade1f BP |
255 | |
256 | iocb->ki_pos = *offset; | |
257 | ret = generic_file_aio_read(iocb, iovp, segs, *offset); | |
1da177e4 LT |
258 | if (ret > 0) |
259 | XFS_STATS_ADD(xs_read_bytes, ret); | |
260 | ||
261 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); | |
1da177e4 LT |
262 | return ret; |
263 | } | |
264 | ||
1b895840 NS |
265 | ssize_t |
266 | xfs_splice_read( | |
993386c1 | 267 | xfs_inode_t *ip, |
1b895840 | 268 | struct file *infilp, |
cbb7e577 | 269 | loff_t *ppos, |
3a326a2c | 270 | struct pipe_inode_info *pipe, |
1b895840 NS |
271 | size_t count, |
272 | int flags, | |
993386c1 | 273 | int ioflags) |
1b895840 | 274 | { |
1b895840 NS |
275 | xfs_mount_t *mp = ip->i_mount; |
276 | ssize_t ret; | |
1da177e4 | 277 | |
1b895840 NS |
278 | XFS_STATS_INC(xs_read_calls); |
279 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) | |
280 | return -EIO; | |
281 | ||
282 | xfs_ilock(ip, XFS_IOLOCK_SHARED); | |
283 | ||
eb9df39d | 284 | if (DM_EVENT_ENABLED(ip, DM_EVENT_READ) && !(ioflags & IO_INVIS)) { |
126468b1 | 285 | int iolock = XFS_IOLOCK_SHARED; |
1b895840 NS |
286 | int error; |
287 | ||
bc4ac74a | 288 | error = XFS_SEND_DATA(mp, DM_EVENT_READ, ip, *ppos, count, |
126468b1 | 289 | FILP_DELAY_FLAG(infilp), &iolock); |
1b895840 NS |
290 | if (error) { |
291 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); | |
292 | return -error; | |
293 | } | |
294 | } | |
613d7043 | 295 | xfs_rw_enter_trace(XFS_SPLICE_READ_ENTER, ip, |
cbb7e577 JA |
296 | pipe, count, *ppos, ioflags); |
297 | ret = generic_file_splice_read(infilp, ppos, pipe, count, flags); | |
1da177e4 LT |
298 | if (ret > 0) |
299 | XFS_STATS_ADD(xs_read_bytes, ret); | |
300 | ||
1b895840 NS |
301 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); |
302 | return ret; | |
303 | } | |
304 | ||
305 | ssize_t | |
306 | xfs_splice_write( | |
993386c1 | 307 | xfs_inode_t *ip, |
3a326a2c | 308 | struct pipe_inode_info *pipe, |
1b895840 | 309 | struct file *outfilp, |
cbb7e577 | 310 | loff_t *ppos, |
1b895840 NS |
311 | size_t count, |
312 | int flags, | |
993386c1 | 313 | int ioflags) |
1b895840 | 314 | { |
1b895840 NS |
315 | xfs_mount_t *mp = ip->i_mount; |
316 | ssize_t ret; | |
0a8d17d0 | 317 | struct inode *inode = outfilp->f_mapping->host; |
ba87ea69 | 318 | xfs_fsize_t isize, new_size; |
1b895840 NS |
319 | |
320 | XFS_STATS_INC(xs_write_calls); | |
321 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) | |
322 | return -EIO; | |
323 | ||
324 | xfs_ilock(ip, XFS_IOLOCK_EXCL); | |
325 | ||
eb9df39d | 326 | if (DM_EVENT_ENABLED(ip, DM_EVENT_WRITE) && !(ioflags & IO_INVIS)) { |
126468b1 | 327 | int iolock = XFS_IOLOCK_EXCL; |
1b895840 NS |
328 | int error; |
329 | ||
bc4ac74a | 330 | error = XFS_SEND_DATA(mp, DM_EVENT_WRITE, ip, *ppos, count, |
126468b1 | 331 | FILP_DELAY_FLAG(outfilp), &iolock); |
1b895840 NS |
332 | if (error) { |
333 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); | |
334 | return -error; | |
335 | } | |
336 | } | |
ba87ea69 LM |
337 | |
338 | new_size = *ppos + count; | |
339 | ||
340 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
341 | if (new_size > ip->i_size) | |
613d7043 | 342 | ip->i_new_size = new_size; |
ba87ea69 LM |
343 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
344 | ||
613d7043 | 345 | xfs_rw_enter_trace(XFS_SPLICE_WRITE_ENTER, ip, |
cbb7e577 JA |
346 | pipe, count, *ppos, ioflags); |
347 | ret = generic_file_splice_write(pipe, outfilp, ppos, count, flags); | |
1b895840 NS |
348 | if (ret > 0) |
349 | XFS_STATS_ADD(xs_write_bytes, ret); | |
350 | ||
0a8d17d0 DC |
351 | isize = i_size_read(inode); |
352 | if (unlikely(ret < 0 && ret != -EFAULT && *ppos > isize)) | |
353 | *ppos = isize; | |
354 | ||
ba87ea69 | 355 | if (*ppos > ip->i_size) { |
0a8d17d0 | 356 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
ba87ea69 LM |
357 | if (*ppos > ip->i_size) |
358 | ip->i_size = *ppos; | |
359 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
360 | } | |
361 | ||
613d7043 | 362 | if (ip->i_new_size) { |
ba87ea69 | 363 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
613d7043 | 364 | ip->i_new_size = 0; |
ba87ea69 LM |
365 | if (ip->i_d.di_size > ip->i_size) |
366 | ip->i_d.di_size = ip->i_size; | |
0a8d17d0 DC |
367 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
368 | } | |
1b895840 | 369 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); |
1da177e4 LT |
370 | return ret; |
371 | } | |
372 | ||
373 | /* | |
374 | * This routine is called to handle zeroing any space in the last | |
375 | * block of the file that is beyond the EOF. We do this since the | |
376 | * size is being increased without writing anything to that block | |
377 | * and we don't want anyone to read the garbage on the disk. | |
378 | */ | |
379 | STATIC int /* error (positive) */ | |
380 | xfs_zero_last_block( | |
541d7d3c | 381 | xfs_inode_t *ip, |
68160161 LM |
382 | xfs_fsize_t offset, |
383 | xfs_fsize_t isize) | |
1da177e4 LT |
384 | { |
385 | xfs_fileoff_t last_fsb; | |
541d7d3c | 386 | xfs_mount_t *mp = ip->i_mount; |
1da177e4 LT |
387 | int nimaps; |
388 | int zero_offset; | |
389 | int zero_len; | |
1da177e4 LT |
390 | int error = 0; |
391 | xfs_bmbt_irec_t imap; | |
1da177e4 | 392 | |
579aa9ca | 393 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); |
1da177e4 | 394 | |
24ee8088 ES |
395 | zero_offset = XFS_B_FSB_OFFSET(mp, isize); |
396 | if (zero_offset == 0) { | |
1da177e4 LT |
397 | /* |
398 | * There are no extra bytes in the last block on disk to | |
399 | * zero, so return. | |
400 | */ | |
401 | return 0; | |
402 | } | |
403 | ||
404 | last_fsb = XFS_B_TO_FSBT(mp, isize); | |
405 | nimaps = 1; | |
541d7d3c | 406 | error = xfs_bmapi(NULL, ip, last_fsb, 1, 0, NULL, 0, &imap, |
3e57ecf6 | 407 | &nimaps, NULL, NULL); |
1da177e4 LT |
408 | if (error) { |
409 | return error; | |
410 | } | |
411 | ASSERT(nimaps > 0); | |
412 | /* | |
413 | * If the block underlying isize is just a hole, then there | |
414 | * is nothing to zero. | |
415 | */ | |
416 | if (imap.br_startblock == HOLESTARTBLOCK) { | |
417 | return 0; | |
418 | } | |
419 | /* | |
420 | * Zero the part of the last block beyond the EOF, and write it | |
421 | * out sync. We need to drop the ilock while we do this so we | |
422 | * don't deadlock when the buffer cache calls back to us. | |
423 | */ | |
579aa9ca | 424 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
1da177e4 | 425 | |
24ee8088 | 426 | zero_len = mp->m_sb.sb_blocksize - zero_offset; |
68160161 LM |
427 | if (isize + zero_len > offset) |
428 | zero_len = offset - isize; | |
429 | error = xfs_iozero(ip, isize, zero_len); | |
1da177e4 | 430 | |
579aa9ca | 431 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
1da177e4 LT |
432 | ASSERT(error >= 0); |
433 | return error; | |
434 | } | |
435 | ||
436 | /* | |
437 | * Zero any on disk space between the current EOF and the new, | |
438 | * larger EOF. This handles the normal case of zeroing the remainder | |
439 | * of the last block in the file and the unusual case of zeroing blocks | |
440 | * out beyond the size of the file. This second case only happens | |
441 | * with fixed size extents and when the system crashes before the inode | |
442 | * size was updated but after blocks were allocated. If fill is set, | |
443 | * then any holes in the range are filled and zeroed. If not, the holes | |
444 | * are left alone as holes. | |
445 | */ | |
446 | ||
447 | int /* error (positive) */ | |
448 | xfs_zero_eof( | |
541d7d3c | 449 | xfs_inode_t *ip, |
1da177e4 | 450 | xfs_off_t offset, /* starting I/O offset */ |
68160161 | 451 | xfs_fsize_t isize) /* current inode size */ |
1da177e4 | 452 | { |
613d7043 | 453 | xfs_mount_t *mp = ip->i_mount; |
1da177e4 LT |
454 | xfs_fileoff_t start_zero_fsb; |
455 | xfs_fileoff_t end_zero_fsb; | |
1da177e4 LT |
456 | xfs_fileoff_t zero_count_fsb; |
457 | xfs_fileoff_t last_fsb; | |
68160161 LM |
458 | xfs_fileoff_t zero_off; |
459 | xfs_fsize_t zero_len; | |
1da177e4 LT |
460 | int nimaps; |
461 | int error = 0; | |
462 | xfs_bmbt_irec_t imap; | |
1da177e4 | 463 | |
579aa9ca | 464 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL)); |
24ee8088 | 465 | ASSERT(offset > isize); |
1da177e4 | 466 | |
1da177e4 LT |
467 | /* |
468 | * First handle zeroing the block on which isize resides. | |
469 | * We only zero a part of that block so it is handled specially. | |
470 | */ | |
541d7d3c | 471 | error = xfs_zero_last_block(ip, offset, isize); |
1da177e4 | 472 | if (error) { |
579aa9ca | 473 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL)); |
1da177e4 LT |
474 | return error; |
475 | } | |
476 | ||
477 | /* | |
478 | * Calculate the range between the new size and the old | |
479 | * where blocks needing to be zeroed may exist. To get the | |
480 | * block where the last byte in the file currently resides, | |
481 | * we need to subtract one from the size and truncate back | |
482 | * to a block boundary. We subtract 1 in case the size is | |
483 | * exactly on a block boundary. | |
484 | */ | |
485 | last_fsb = isize ? XFS_B_TO_FSBT(mp, isize - 1) : (xfs_fileoff_t)-1; | |
486 | start_zero_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)isize); | |
487 | end_zero_fsb = XFS_B_TO_FSBT(mp, offset - 1); | |
488 | ASSERT((xfs_sfiloff_t)last_fsb < (xfs_sfiloff_t)start_zero_fsb); | |
489 | if (last_fsb == end_zero_fsb) { | |
490 | /* | |
491 | * The size was only incremented on its last block. | |
492 | * We took care of that above, so just return. | |
493 | */ | |
494 | return 0; | |
495 | } | |
496 | ||
497 | ASSERT(start_zero_fsb <= end_zero_fsb); | |
1da177e4 LT |
498 | while (start_zero_fsb <= end_zero_fsb) { |
499 | nimaps = 1; | |
500 | zero_count_fsb = end_zero_fsb - start_zero_fsb + 1; | |
541d7d3c | 501 | error = xfs_bmapi(NULL, ip, start_zero_fsb, zero_count_fsb, |
3e57ecf6 | 502 | 0, NULL, 0, &imap, &nimaps, NULL, NULL); |
1da177e4 | 503 | if (error) { |
579aa9ca | 504 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL)); |
1da177e4 LT |
505 | return error; |
506 | } | |
507 | ASSERT(nimaps > 0); | |
508 | ||
509 | if (imap.br_state == XFS_EXT_UNWRITTEN || | |
510 | imap.br_startblock == HOLESTARTBLOCK) { | |
511 | /* | |
512 | * This loop handles initializing pages that were | |
513 | * partially initialized by the code below this | |
514 | * loop. It basically zeroes the part of the page | |
515 | * that sits on a hole and sets the page as P_HOLE | |
516 | * and calls remapf if it is a mapped file. | |
517 | */ | |
24ee8088 | 518 | start_zero_fsb = imap.br_startoff + imap.br_blockcount; |
1da177e4 LT |
519 | ASSERT(start_zero_fsb <= (end_zero_fsb + 1)); |
520 | continue; | |
521 | } | |
522 | ||
523 | /* | |
3d80ede4 | 524 | * There are blocks we need to zero. |
1da177e4 LT |
525 | * Drop the inode lock while we're doing the I/O. |
526 | * We'll still have the iolock to protect us. | |
527 | */ | |
579aa9ca | 528 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
1da177e4 | 529 | |
68160161 LM |
530 | zero_off = XFS_FSB_TO_B(mp, start_zero_fsb); |
531 | zero_len = XFS_FSB_TO_B(mp, imap.br_blockcount); | |
532 | ||
533 | if ((zero_off + zero_len) > offset) | |
534 | zero_len = offset - zero_off; | |
535 | ||
536 | error = xfs_iozero(ip, zero_off, zero_len); | |
1da177e4 LT |
537 | if (error) { |
538 | goto out_lock; | |
539 | } | |
540 | ||
3d80ede4 | 541 | start_zero_fsb = imap.br_startoff + imap.br_blockcount; |
1da177e4 LT |
542 | ASSERT(start_zero_fsb <= (end_zero_fsb + 1)); |
543 | ||
579aa9ca | 544 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
1da177e4 LT |
545 | } |
546 | ||
547 | return 0; | |
548 | ||
549 | out_lock: | |
579aa9ca | 550 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
1da177e4 LT |
551 | ASSERT(error >= 0); |
552 | return error; | |
553 | } | |
554 | ||
555 | ssize_t /* bytes written, or (-) error */ | |
556 | xfs_write( | |
993386c1 | 557 | struct xfs_inode *xip, |
1da177e4 LT |
558 | struct kiocb *iocb, |
559 | const struct iovec *iovp, | |
560 | unsigned int nsegs, | |
561 | loff_t *offset, | |
993386c1 | 562 | int ioflags) |
1da177e4 LT |
563 | { |
564 | struct file *file = iocb->ki_filp; | |
565 | struct address_space *mapping = file->f_mapping; | |
566 | struct inode *inode = mapping->host; | |
567 | unsigned long segs = nsegs; | |
1da177e4 LT |
568 | xfs_mount_t *mp; |
569 | ssize_t ret = 0, error = 0; | |
570 | xfs_fsize_t isize, new_size; | |
1da177e4 LT |
571 | int iolock; |
572 | int eventsent = 0; | |
1da177e4 LT |
573 | size_t ocount = 0, count; |
574 | loff_t pos; | |
2a329631 | 575 | int need_i_mutex; |
1da177e4 LT |
576 | |
577 | XFS_STATS_INC(xs_write_calls); | |
578 | ||
0ceb3314 DM |
579 | error = generic_segment_checks(iovp, &segs, &ocount, VERIFY_READ); |
580 | if (error) | |
581 | return error; | |
1da177e4 LT |
582 | |
583 | count = ocount; | |
584 | pos = *offset; | |
585 | ||
586 | if (count == 0) | |
587 | return 0; | |
588 | ||
613d7043 | 589 | mp = xip->i_mount; |
1da177e4 | 590 | |
b267ce99 | 591 | xfs_wait_for_freeze(mp, SB_FREEZE_WRITE); |
34327e13 | 592 | |
1da177e4 LT |
593 | if (XFS_FORCED_SHUTDOWN(mp)) |
594 | return -EIO; | |
595 | ||
1da177e4 | 596 | relock: |
2a329631 LM |
597 | if (ioflags & IO_ISDIRECT) { |
598 | iolock = XFS_IOLOCK_SHARED; | |
2a329631 LM |
599 | need_i_mutex = 0; |
600 | } else { | |
1da177e4 | 601 | iolock = XFS_IOLOCK_EXCL; |
2a329631 | 602 | need_i_mutex = 1; |
1b1dcc1b | 603 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
604 | } |
605 | ||
606 | xfs_ilock(xip, XFS_ILOCK_EXCL|iolock); | |
607 | ||
1da177e4 LT |
608 | start: |
609 | error = -generic_write_checks(file, &pos, &count, | |
610 | S_ISBLK(inode->i_mode)); | |
611 | if (error) { | |
612 | xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock); | |
a13828b1 | 613 | goto out_unlock_mutex; |
1da177e4 LT |
614 | } |
615 | ||
eb9df39d | 616 | if ((DM_EVENT_ENABLED(xip, DM_EVENT_WRITE) && |
1da177e4 | 617 | !(ioflags & IO_INVIS) && !eventsent)) { |
1da177e4 LT |
618 | int dmflags = FILP_DELAY_FLAG(file); |
619 | ||
a13828b1 | 620 | if (need_i_mutex) |
1b1dcc1b | 621 | dmflags |= DM_FLAGS_IMUX; |
1da177e4 LT |
622 | |
623 | xfs_iunlock(xip, XFS_ILOCK_EXCL); | |
bc4ac74a | 624 | error = XFS_SEND_DATA(xip->i_mount, DM_EVENT_WRITE, xip, |
126468b1 | 625 | pos, count, dmflags, &iolock); |
1da177e4 | 626 | if (error) { |
ba87ea69 | 627 | goto out_unlock_internal; |
1da177e4 LT |
628 | } |
629 | xfs_ilock(xip, XFS_ILOCK_EXCL); | |
630 | eventsent = 1; | |
631 | ||
632 | /* | |
c41564b5 | 633 | * The iolock was dropped and reacquired in XFS_SEND_DATA |
1da177e4 LT |
634 | * so we have to recheck the size when appending. |
635 | * We will only "goto start;" once, since having sent the | |
636 | * event prevents another call to XFS_SEND_DATA, which is | |
637 | * what allows the size to change in the first place. | |
638 | */ | |
71dfd5a3 | 639 | if ((file->f_flags & O_APPEND) && pos != xip->i_size) |
1da177e4 | 640 | goto start; |
1da177e4 LT |
641 | } |
642 | ||
71dfd5a3 LM |
643 | if (ioflags & IO_ISDIRECT) { |
644 | xfs_buftarg_t *target = | |
71ddabb9 | 645 | XFS_IS_REALTIME_INODE(xip) ? |
71dfd5a3 LM |
646 | mp->m_rtdev_targp : mp->m_ddev_targp; |
647 | ||
648 | if ((pos & target->bt_smask) || (count & target->bt_smask)) { | |
649 | xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock); | |
650 | return XFS_ERROR(-EINVAL); | |
651 | } | |
652 | ||
dcf49cc5 | 653 | if (!need_i_mutex && (mapping->nrpages || pos > xip->i_size)) { |
71dfd5a3 LM |
654 | xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock); |
655 | iolock = XFS_IOLOCK_EXCL; | |
71dfd5a3 LM |
656 | need_i_mutex = 1; |
657 | mutex_lock(&inode->i_mutex); | |
658 | xfs_ilock(xip, XFS_ILOCK_EXCL|iolock); | |
1da177e4 LT |
659 | goto start; |
660 | } | |
661 | } | |
662 | ||
71dfd5a3 LM |
663 | new_size = pos + count; |
664 | if (new_size > xip->i_size) | |
613d7043 | 665 | xip->i_new_size = new_size; |
71dfd5a3 | 666 | |
2234d54d | 667 | if (likely(!(ioflags & IO_INVIS))) |
f9581b14 | 668 | file_update_time(file); |
1da177e4 LT |
669 | |
670 | /* | |
671 | * If the offset is beyond the size of the file, we have a couple | |
672 | * of things to do. First, if there is already space allocated | |
673 | * we need to either create holes or zero the disk or ... | |
674 | * | |
675 | * If there is a page where the previous size lands, we need | |
676 | * to zero it out up to the new size. | |
677 | */ | |
678 | ||
ba87ea69 | 679 | if (pos > xip->i_size) { |
541d7d3c | 680 | error = xfs_zero_eof(xip, pos, xip->i_size); |
1da177e4 | 681 | if (error) { |
ba87ea69 LM |
682 | xfs_iunlock(xip, XFS_ILOCK_EXCL); |
683 | goto out_unlock_internal; | |
1da177e4 LT |
684 | } |
685 | } | |
686 | xfs_iunlock(xip, XFS_ILOCK_EXCL); | |
687 | ||
688 | /* | |
689 | * If we're writing the file then make sure to clear the | |
690 | * setuid and setgid bits if the process is not being run | |
691 | * by root. This keeps people from modifying setuid and | |
692 | * setgid binaries. | |
693 | */ | |
694 | ||
695 | if (((xip->i_d.di_mode & S_ISUID) || | |
696 | ((xip->i_d.di_mode & (S_ISGID | S_IXGRP)) == | |
697 | (S_ISGID | S_IXGRP))) && | |
698 | !capable(CAP_FSETID)) { | |
699 | error = xfs_write_clear_setuid(xip); | |
700 | if (likely(!error)) | |
2f1936b8 | 701 | error = -file_remove_suid(file); |
1da177e4 | 702 | if (unlikely(error)) { |
ba87ea69 | 703 | goto out_unlock_internal; |
1da177e4 LT |
704 | } |
705 | } | |
706 | ||
1da177e4 LT |
707 | /* We can write back this queue in page reclaim */ |
708 | current->backing_dev_info = mapping->backing_dev_info; | |
709 | ||
710 | if ((ioflags & IO_ISDIRECT)) { | |
dcf49cc5 | 711 | if (mapping->nrpages) { |
2a329631 | 712 | WARN_ON(need_i_mutex == 0); |
613d7043 | 713 | xfs_inval_cached_trace(xip, pos, -1, |
e6a4b37f | 714 | (pos & PAGE_CACHE_MASK), -1); |
739bfb2a | 715 | error = xfs_flushinval_pages(xip, |
e6a4b37f | 716 | (pos & PAGE_CACHE_MASK), |
1da177e4 | 717 | -1, FI_REMAPF_LOCKED); |
d3cf2094 LM |
718 | if (error) |
719 | goto out_unlock_internal; | |
1da177e4 LT |
720 | } |
721 | ||
a13828b1 | 722 | if (need_i_mutex) { |
1da177e4 | 723 | /* demote the lock now the cached pages are gone */ |
541d7d3c | 724 | xfs_ilock_demote(xip, XFS_IOLOCK_EXCL); |
1b1dcc1b | 725 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
726 | |
727 | iolock = XFS_IOLOCK_SHARED; | |
a13828b1 | 728 | need_i_mutex = 0; |
1da177e4 LT |
729 | } |
730 | ||
613d7043 | 731 | xfs_rw_enter_trace(XFS_DIOWR_ENTER, xip, (void *)iovp, segs, |
1da177e4 LT |
732 | *offset, ioflags); |
733 | ret = generic_file_direct_write(iocb, iovp, | |
734 | &segs, pos, offset, count, ocount); | |
735 | ||
736 | /* | |
737 | * direct-io write to a hole: fall through to buffered I/O | |
738 | * for completing the rest of the request. | |
739 | */ | |
740 | if (ret >= 0 && ret != count) { | |
741 | XFS_STATS_ADD(xs_write_bytes, ret); | |
742 | ||
743 | pos += ret; | |
744 | count -= ret; | |
745 | ||
1da177e4 LT |
746 | ioflags &= ~IO_ISDIRECT; |
747 | xfs_iunlock(xip, iolock); | |
748 | goto relock; | |
749 | } | |
750 | } else { | |
5825294e DC |
751 | int enospc = 0; |
752 | ssize_t ret2 = 0; | |
753 | ||
754 | write_retry: | |
613d7043 | 755 | xfs_rw_enter_trace(XFS_WRITE_ENTER, xip, (void *)iovp, segs, |
1da177e4 | 756 | *offset, ioflags); |
5825294e | 757 | ret2 = generic_file_buffered_write(iocb, iovp, segs, |
1da177e4 | 758 | pos, offset, count, ret); |
5825294e DC |
759 | /* |
760 | * if we just got an ENOSPC, flush the inode now we | |
761 | * aren't holding any page locks and retry *once* | |
762 | */ | |
763 | if (ret2 == -ENOSPC && !enospc) { | |
764 | error = xfs_flush_pages(xip, 0, -1, 0, FI_NONE); | |
765 | if (error) | |
766 | goto out_unlock_internal; | |
767 | enospc = 1; | |
768 | goto write_retry; | |
769 | } | |
770 | ret = ret2; | |
1da177e4 LT |
771 | } |
772 | ||
773 | current->backing_dev_info = NULL; | |
774 | ||
25051158 LM |
775 | isize = i_size_read(inode); |
776 | if (unlikely(ret < 0 && ret != -EFAULT && *offset > isize)) | |
777 | *offset = isize; | |
778 | ||
779 | if (*offset > xip->i_size) { | |
780 | xfs_ilock(xip, XFS_ILOCK_EXCL); | |
781 | if (*offset > xip->i_size) | |
782 | xip->i_size = *offset; | |
783 | xfs_iunlock(xip, XFS_ILOCK_EXCL); | |
784 | } | |
785 | ||
eb9df39d CH |
786 | if (ret == -ENOSPC && |
787 | DM_EVENT_ENABLED(xip, DM_EVENT_NOSPACE) && !(ioflags & IO_INVIS)) { | |
126468b1 | 788 | xfs_iunlock(xip, iolock); |
a13828b1 | 789 | if (need_i_mutex) |
1b1dcc1b | 790 | mutex_unlock(&inode->i_mutex); |
bc4ac74a CH |
791 | error = XFS_SEND_NAMESP(xip->i_mount, DM_EVENT_NOSPACE, xip, |
792 | DM_RIGHT_NULL, xip, DM_RIGHT_NULL, NULL, NULL, | |
1da177e4 | 793 | 0, 0, 0); /* Delay flag intentionally unused */ |
a13828b1 | 794 | if (need_i_mutex) |
1b1dcc1b | 795 | mutex_lock(&inode->i_mutex); |
126468b1 | 796 | xfs_ilock(xip, iolock); |
ba87ea69 LM |
797 | if (error) |
798 | goto out_unlock_internal; | |
25051158 | 799 | goto start; |
1da177e4 LT |
800 | } |
801 | ||
802 | error = -ret; | |
803 | if (ret <= 0) | |
804 | goto out_unlock_internal; | |
805 | ||
806 | XFS_STATS_ADD(xs_write_bytes, ret); | |
807 | ||
808 | /* Handle various SYNC-type writes */ | |
6b2f3d1f | 809 | if ((file->f_flags & O_DSYNC) || IS_SYNC(inode)) { |
13e6d5cd | 810 | loff_t end = pos + ret - 1; |
5903c495 | 811 | int error2; |
126468b1 CH |
812 | |
813 | xfs_iunlock(xip, iolock); | |
a13828b1 | 814 | if (need_i_mutex) |
1b1dcc1b | 815 | mutex_unlock(&inode->i_mutex); |
13e6d5cd CH |
816 | |
817 | error2 = filemap_write_and_wait_range(mapping, pos, end); | |
1da177e4 | 818 | if (!error) |
5903c495 | 819 | error = error2; |
ba87ea69 LM |
820 | if (need_i_mutex) |
821 | mutex_lock(&inode->i_mutex); | |
126468b1 | 822 | xfs_ilock(xip, iolock); |
13e6d5cd CH |
823 | |
824 | error2 = xfs_fsync(xip); | |
5903c495 LM |
825 | if (!error) |
826 | error = error2; | |
1da177e4 LT |
827 | } |
828 | ||
829 | out_unlock_internal: | |
613d7043 | 830 | if (xip->i_new_size) { |
ba87ea69 | 831 | xfs_ilock(xip, XFS_ILOCK_EXCL); |
613d7043 | 832 | xip->i_new_size = 0; |
ba87ea69 LM |
833 | /* |
834 | * If this was a direct or synchronous I/O that failed (such | |
835 | * as ENOSPC) then part of the I/O may have been written to | |
836 | * disk before the error occured. In this case the on-disk | |
837 | * file size may have been adjusted beyond the in-memory file | |
838 | * size and now needs to be truncated back. | |
839 | */ | |
840 | if (xip->i_d.di_size > xip->i_size) | |
841 | xip->i_d.di_size = xip->i_size; | |
842 | xfs_iunlock(xip, XFS_ILOCK_EXCL); | |
843 | } | |
126468b1 | 844 | xfs_iunlock(xip, iolock); |
a13828b1 NS |
845 | out_unlock_mutex: |
846 | if (need_i_mutex) | |
1b1dcc1b | 847 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
848 | return -error; |
849 | } | |
850 | ||
851 | /* | |
852 | * All xfs metadata buffers except log state machine buffers | |
853 | * get this attached as their b_bdstrat callback function. | |
854 | * This is so that we can catch a buffer | |
855 | * after prematurely unpinning it to forcibly shutdown the filesystem. | |
856 | */ | |
857 | int | |
858 | xfs_bdstrat_cb(struct xfs_buf *bp) | |
859 | { | |
15ac08a8 | 860 | if (XFS_FORCED_SHUTDOWN(bp->b_mount)) { |
1da177e4 LT |
861 | xfs_buftrace("XFS__BDSTRAT IOERROR", bp); |
862 | /* | |
863 | * Metadata write that didn't get logged but | |
864 | * written delayed anyway. These aren't associated | |
865 | * with a transaction, and can be ignored. | |
866 | */ | |
867 | if (XFS_BUF_IODONE_FUNC(bp) == NULL && | |
868 | (XFS_BUF_ISREAD(bp)) == 0) | |
869 | return (xfs_bioerror_relse(bp)); | |
870 | else | |
871 | return (xfs_bioerror(bp)); | |
872 | } | |
15ac08a8 CH |
873 | |
874 | xfs_buf_iorequest(bp); | |
875 | return 0; | |
1da177e4 LT |
876 | } |
877 | ||
1da177e4 | 878 | /* |
d64e31a2 DC |
879 | * Wrapper around bdstrat so that we can stop data from going to disk in case |
880 | * we are shutting down the filesystem. Typically user data goes thru this | |
881 | * path; one of the exceptions is the superblock. | |
1da177e4 | 882 | */ |
d64e31a2 | 883 | void |
1da177e4 LT |
884 | xfsbdstrat( |
885 | struct xfs_mount *mp, | |
886 | struct xfs_buf *bp) | |
887 | { | |
888 | ASSERT(mp); | |
d4055947 | 889 | if (!XFS_FORCED_SHUTDOWN(mp)) { |
ce8e922c | 890 | xfs_buf_iorequest(bp); |
d4055947 DC |
891 | return; |
892 | } | |
1da177e4 LT |
893 | |
894 | xfs_buftrace("XFSBDSTRAT IOERROR", bp); | |
d64e31a2 | 895 | xfs_bioerror_relse(bp); |
1da177e4 LT |
896 | } |
897 | ||
898 | /* | |
899 | * If the underlying (data/log/rt) device is readonly, there are some | |
900 | * operations that cannot proceed. | |
901 | */ | |
902 | int | |
903 | xfs_dev_is_read_only( | |
904 | xfs_mount_t *mp, | |
905 | char *message) | |
906 | { | |
907 | if (xfs_readonly_buftarg(mp->m_ddev_targp) || | |
908 | xfs_readonly_buftarg(mp->m_logdev_targp) || | |
909 | (mp->m_rtdev_targp && xfs_readonly_buftarg(mp->m_rtdev_targp))) { | |
910 | cmn_err(CE_NOTE, | |
911 | "XFS: %s required on read-only device.", message); | |
912 | cmn_err(CE_NOTE, | |
913 | "XFS: write access unavailable, cannot proceed."); | |
914 | return EROFS; | |
915 | } | |
916 | return 0; | |
917 | } |