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Commit | Line | Data |
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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" | |
45 | #include "xfs_acl.h" | |
1da177e4 LT |
46 | #include "xfs_attr.h" |
47 | #include "xfs_inode_item.h" | |
48 | #include "xfs_buf_item.h" | |
49 | #include "xfs_utils.h" | |
50 | #include "xfs_iomap.h" | |
993386c1 | 51 | #include "xfs_vnodeops.h" |
1da177e4 LT |
52 | |
53 | #include <linux/capability.h> | |
ec82687f | 54 | #include <linux/mount.h> |
1da177e4 LT |
55 | #include <linux/writeback.h> |
56 | ||
57 | ||
58 | #if defined(XFS_RW_TRACE) | |
59 | void | |
60 | xfs_rw_enter_trace( | |
61 | int tag, | |
613d7043 | 62 | xfs_inode_t *ip, |
1da177e4 LT |
63 | void *data, |
64 | size_t segs, | |
65 | loff_t offset, | |
66 | int ioflags) | |
67 | { | |
1da177e4 LT |
68 | if (ip->i_rwtrace == NULL) |
69 | return; | |
70 | ktrace_enter(ip->i_rwtrace, | |
71 | (void *)(unsigned long)tag, | |
72 | (void *)ip, | |
73 | (void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)), | |
74 | (void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)), | |
75 | (void *)data, | |
76 | (void *)((unsigned long)segs), | |
77 | (void *)((unsigned long)((offset >> 32) & 0xffffffff)), | |
78 | (void *)((unsigned long)(offset & 0xffffffff)), | |
79 | (void *)((unsigned long)ioflags), | |
613d7043 CH |
80 | (void *)((unsigned long)((ip->i_new_size >> 32) & 0xffffffff)), |
81 | (void *)((unsigned long)(ip->i_new_size & 0xffffffff)), | |
f1fdc848 | 82 | (void *)((unsigned long)current_pid()), |
1da177e4 LT |
83 | (void *)NULL, |
84 | (void *)NULL, | |
85 | (void *)NULL, | |
86 | (void *)NULL); | |
87 | } | |
88 | ||
89 | void | |
90 | xfs_inval_cached_trace( | |
613d7043 | 91 | xfs_inode_t *ip, |
1da177e4 LT |
92 | xfs_off_t offset, |
93 | xfs_off_t len, | |
94 | xfs_off_t first, | |
95 | xfs_off_t last) | |
96 | { | |
1da177e4 LT |
97 | |
98 | if (ip->i_rwtrace == NULL) | |
99 | return; | |
100 | ktrace_enter(ip->i_rwtrace, | |
101 | (void *)(__psint_t)XFS_INVAL_CACHED, | |
102 | (void *)ip, | |
103 | (void *)((unsigned long)((offset >> 32) & 0xffffffff)), | |
104 | (void *)((unsigned long)(offset & 0xffffffff)), | |
105 | (void *)((unsigned long)((len >> 32) & 0xffffffff)), | |
106 | (void *)((unsigned long)(len & 0xffffffff)), | |
107 | (void *)((unsigned long)((first >> 32) & 0xffffffff)), | |
108 | (void *)((unsigned long)(first & 0xffffffff)), | |
109 | (void *)((unsigned long)((last >> 32) & 0xffffffff)), | |
110 | (void *)((unsigned long)(last & 0xffffffff)), | |
f1fdc848 | 111 | (void *)((unsigned long)current_pid()), |
1da177e4 LT |
112 | (void *)NULL, |
113 | (void *)NULL, | |
114 | (void *)NULL, | |
115 | (void *)NULL, | |
116 | (void *)NULL); | |
117 | } | |
118 | #endif | |
119 | ||
120 | /* | |
121 | * xfs_iozero | |
122 | * | |
123 | * xfs_iozero clears the specified range of buffer supplied, | |
124 | * and marks all the affected blocks as valid and modified. If | |
125 | * an affected block is not allocated, it will be allocated. If | |
126 | * an affected block is not completely overwritten, and is not | |
127 | * valid before the operation, it will be read from disk before | |
128 | * being partially zeroed. | |
129 | */ | |
130 | STATIC int | |
131 | xfs_iozero( | |
541d7d3c | 132 | struct xfs_inode *ip, /* inode */ |
1da177e4 | 133 | loff_t pos, /* offset in file */ |
68160161 | 134 | size_t count) /* size of data to zero */ |
1da177e4 | 135 | { |
1da177e4 LT |
136 | struct page *page; |
137 | struct address_space *mapping; | |
1da177e4 LT |
138 | int status; |
139 | ||
01651646 | 140 | mapping = VFS_I(ip)->i_mapping; |
1da177e4 | 141 | do { |
d79689c7 NP |
142 | unsigned offset, bytes; |
143 | void *fsdata; | |
1da177e4 LT |
144 | |
145 | offset = (pos & (PAGE_CACHE_SIZE -1)); /* Within page */ | |
1da177e4 LT |
146 | bytes = PAGE_CACHE_SIZE - offset; |
147 | if (bytes > count) | |
148 | bytes = count; | |
149 | ||
d79689c7 NP |
150 | status = pagecache_write_begin(NULL, mapping, pos, bytes, |
151 | AOP_FLAG_UNINTERRUPTIBLE, | |
152 | &page, &fsdata); | |
e7ff6aed | 153 | if (status) |
d79689c7 | 154 | break; |
1da177e4 | 155 | |
eebd2aa3 | 156 | zero_user(page, offset, bytes); |
e7ff6aed | 157 | |
d79689c7 NP |
158 | status = pagecache_write_end(NULL, mapping, pos, bytes, bytes, |
159 | page, fsdata); | |
160 | WARN_ON(status <= 0); /* can't return less than zero! */ | |
161 | pos += bytes; | |
162 | count -= bytes; | |
163 | status = 0; | |
1da177e4 LT |
164 | } while (count); |
165 | ||
166 | return (-status); | |
167 | } | |
168 | ||
1da177e4 LT |
169 | ssize_t /* bytes read, or (-) error */ |
170 | xfs_read( | |
993386c1 | 171 | xfs_inode_t *ip, |
1da177e4 LT |
172 | struct kiocb *iocb, |
173 | const struct iovec *iovp, | |
174 | unsigned int segs, | |
175 | loff_t *offset, | |
993386c1 | 176 | int ioflags) |
1da177e4 LT |
177 | { |
178 | struct file *file = iocb->ki_filp; | |
179 | struct inode *inode = file->f_mapping->host; | |
993386c1 | 180 | xfs_mount_t *mp = ip->i_mount; |
1da177e4 | 181 | size_t size = 0; |
d3cf2094 | 182 | ssize_t ret = 0; |
1da177e4 | 183 | xfs_fsize_t n; |
1da177e4 LT |
184 | unsigned long seg; |
185 | ||
1da177e4 LT |
186 | |
187 | XFS_STATS_INC(xs_read_calls); | |
188 | ||
189 | /* START copy & waste from filemap.c */ | |
190 | for (seg = 0; seg < segs; seg++) { | |
191 | const struct iovec *iv = &iovp[seg]; | |
192 | ||
193 | /* | |
194 | * If any segment has a negative length, or the cumulative | |
195 | * length ever wraps negative then return -EINVAL. | |
196 | */ | |
197 | size += iv->iov_len; | |
198 | if (unlikely((ssize_t)(size|iv->iov_len) < 0)) | |
199 | return XFS_ERROR(-EINVAL); | |
200 | } | |
201 | /* END copy & waste from filemap.c */ | |
202 | ||
203 | if (unlikely(ioflags & IO_ISDIRECT)) { | |
204 | xfs_buftarg_t *target = | |
71ddabb9 | 205 | XFS_IS_REALTIME_INODE(ip) ? |
1da177e4 | 206 | mp->m_rtdev_targp : mp->m_ddev_targp; |
ce8e922c NS |
207 | if ((*offset & target->bt_smask) || |
208 | (size & target->bt_smask)) { | |
ba87ea69 | 209 | if (*offset == ip->i_size) { |
1da177e4 LT |
210 | return (0); |
211 | } | |
212 | return -XFS_ERROR(EINVAL); | |
213 | } | |
214 | } | |
215 | ||
216 | n = XFS_MAXIOFFSET(mp) - *offset; | |
217 | if ((n <= 0) || (size == 0)) | |
218 | return 0; | |
219 | ||
220 | if (n < size) | |
221 | size = n; | |
222 | ||
a13828b1 | 223 | if (XFS_FORCED_SHUTDOWN(mp)) |
1da177e4 | 224 | return -EIO; |
1da177e4 LT |
225 | |
226 | if (unlikely(ioflags & IO_ISDIRECT)) | |
1b1dcc1b | 227 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
228 | xfs_ilock(ip, XFS_IOLOCK_SHARED); |
229 | ||
eb9df39d | 230 | if (DM_EVENT_ENABLED(ip, DM_EVENT_READ) && !(ioflags & IO_INVIS)) { |
e1a40fa9 | 231 | int dmflags = FILP_DELAY_FLAG(file) | DM_SEM_FLAG_RD(ioflags); |
126468b1 | 232 | int iolock = XFS_IOLOCK_SHARED; |
1da177e4 | 233 | |
bc4ac74a | 234 | ret = -XFS_SEND_DATA(mp, DM_EVENT_READ, ip, *offset, size, |
126468b1 | 235 | dmflags, &iolock); |
1da177e4 LT |
236 | if (ret) { |
237 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); | |
721259bc LM |
238 | if (unlikely(ioflags & IO_ISDIRECT)) |
239 | mutex_unlock(&inode->i_mutex); | |
240 | return ret; | |
1da177e4 LT |
241 | } |
242 | } | |
243 | ||
edcd4bce | 244 | if (unlikely(ioflags & IO_ISDIRECT)) { |
dcf49cc5 | 245 | if (inode->i_mapping->nrpages) |
2e656092 | 246 | ret = -xfs_flushinval_pages(ip, (*offset & PAGE_CACHE_MASK), |
e6a4b37f | 247 | -1, FI_REMAPF_LOCKED); |
721259bc | 248 | mutex_unlock(&inode->i_mutex); |
d3cf2094 LM |
249 | if (ret) { |
250 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); | |
251 | return ret; | |
252 | } | |
edcd4bce | 253 | } |
721259bc | 254 | |
613d7043 | 255 | xfs_rw_enter_trace(XFS_READ_ENTER, ip, |
1da177e4 | 256 | (void *)iovp, segs, *offset, ioflags); |
543ade1f BP |
257 | |
258 | iocb->ki_pos = *offset; | |
259 | ret = generic_file_aio_read(iocb, iovp, segs, *offset); | |
1da177e4 LT |
260 | if (ret == -EIOCBQUEUED && !(ioflags & IO_ISAIO)) |
261 | ret = wait_on_sync_kiocb(iocb); | |
262 | if (ret > 0) | |
263 | XFS_STATS_ADD(xs_read_bytes, ret); | |
264 | ||
265 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); | |
1da177e4 LT |
266 | return ret; |
267 | } | |
268 | ||
1b895840 NS |
269 | ssize_t |
270 | xfs_splice_read( | |
993386c1 | 271 | xfs_inode_t *ip, |
1b895840 | 272 | struct file *infilp, |
cbb7e577 | 273 | loff_t *ppos, |
3a326a2c | 274 | struct pipe_inode_info *pipe, |
1b895840 NS |
275 | size_t count, |
276 | int flags, | |
993386c1 | 277 | int ioflags) |
1b895840 | 278 | { |
1b895840 NS |
279 | xfs_mount_t *mp = ip->i_mount; |
280 | ssize_t ret; | |
1da177e4 | 281 | |
1b895840 NS |
282 | XFS_STATS_INC(xs_read_calls); |
283 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) | |
284 | return -EIO; | |
285 | ||
286 | xfs_ilock(ip, XFS_IOLOCK_SHARED); | |
287 | ||
eb9df39d | 288 | if (DM_EVENT_ENABLED(ip, DM_EVENT_READ) && !(ioflags & IO_INVIS)) { |
126468b1 | 289 | int iolock = XFS_IOLOCK_SHARED; |
1b895840 NS |
290 | int error; |
291 | ||
bc4ac74a | 292 | error = XFS_SEND_DATA(mp, DM_EVENT_READ, ip, *ppos, count, |
126468b1 | 293 | FILP_DELAY_FLAG(infilp), &iolock); |
1b895840 NS |
294 | if (error) { |
295 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); | |
296 | return -error; | |
297 | } | |
298 | } | |
613d7043 | 299 | xfs_rw_enter_trace(XFS_SPLICE_READ_ENTER, ip, |
cbb7e577 JA |
300 | pipe, count, *ppos, ioflags); |
301 | ret = generic_file_splice_read(infilp, ppos, pipe, count, flags); | |
1da177e4 LT |
302 | if (ret > 0) |
303 | XFS_STATS_ADD(xs_read_bytes, ret); | |
304 | ||
1b895840 NS |
305 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); |
306 | return ret; | |
307 | } | |
308 | ||
309 | ssize_t | |
310 | xfs_splice_write( | |
993386c1 | 311 | xfs_inode_t *ip, |
3a326a2c | 312 | struct pipe_inode_info *pipe, |
1b895840 | 313 | struct file *outfilp, |
cbb7e577 | 314 | loff_t *ppos, |
1b895840 NS |
315 | size_t count, |
316 | int flags, | |
993386c1 | 317 | int ioflags) |
1b895840 | 318 | { |
1b895840 NS |
319 | xfs_mount_t *mp = ip->i_mount; |
320 | ssize_t ret; | |
0a8d17d0 | 321 | struct inode *inode = outfilp->f_mapping->host; |
ba87ea69 | 322 | xfs_fsize_t isize, new_size; |
1b895840 NS |
323 | |
324 | XFS_STATS_INC(xs_write_calls); | |
325 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) | |
326 | return -EIO; | |
327 | ||
328 | xfs_ilock(ip, XFS_IOLOCK_EXCL); | |
329 | ||
eb9df39d | 330 | if (DM_EVENT_ENABLED(ip, DM_EVENT_WRITE) && !(ioflags & IO_INVIS)) { |
126468b1 | 331 | int iolock = XFS_IOLOCK_EXCL; |
1b895840 NS |
332 | int error; |
333 | ||
bc4ac74a | 334 | error = XFS_SEND_DATA(mp, DM_EVENT_WRITE, ip, *ppos, count, |
126468b1 | 335 | FILP_DELAY_FLAG(outfilp), &iolock); |
1b895840 NS |
336 | if (error) { |
337 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); | |
338 | return -error; | |
339 | } | |
340 | } | |
ba87ea69 LM |
341 | |
342 | new_size = *ppos + count; | |
343 | ||
344 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
345 | if (new_size > ip->i_size) | |
613d7043 | 346 | ip->i_new_size = new_size; |
ba87ea69 LM |
347 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
348 | ||
613d7043 | 349 | xfs_rw_enter_trace(XFS_SPLICE_WRITE_ENTER, ip, |
cbb7e577 JA |
350 | pipe, count, *ppos, ioflags); |
351 | ret = generic_file_splice_write(pipe, outfilp, ppos, count, flags); | |
1b895840 NS |
352 | if (ret > 0) |
353 | XFS_STATS_ADD(xs_write_bytes, ret); | |
354 | ||
0a8d17d0 DC |
355 | isize = i_size_read(inode); |
356 | if (unlikely(ret < 0 && ret != -EFAULT && *ppos > isize)) | |
357 | *ppos = isize; | |
358 | ||
ba87ea69 | 359 | if (*ppos > ip->i_size) { |
0a8d17d0 | 360 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
ba87ea69 LM |
361 | if (*ppos > ip->i_size) |
362 | ip->i_size = *ppos; | |
363 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
364 | } | |
365 | ||
613d7043 | 366 | if (ip->i_new_size) { |
ba87ea69 | 367 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
613d7043 | 368 | ip->i_new_size = 0; |
ba87ea69 LM |
369 | if (ip->i_d.di_size > ip->i_size) |
370 | ip->i_d.di_size = ip->i_size; | |
0a8d17d0 DC |
371 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
372 | } | |
1b895840 | 373 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); |
1da177e4 LT |
374 | return ret; |
375 | } | |
376 | ||
377 | /* | |
378 | * This routine is called to handle zeroing any space in the last | |
379 | * block of the file that is beyond the EOF. We do this since the | |
380 | * size is being increased without writing anything to that block | |
381 | * and we don't want anyone to read the garbage on the disk. | |
382 | */ | |
383 | STATIC int /* error (positive) */ | |
384 | xfs_zero_last_block( | |
541d7d3c | 385 | xfs_inode_t *ip, |
68160161 LM |
386 | xfs_fsize_t offset, |
387 | xfs_fsize_t isize) | |
1da177e4 LT |
388 | { |
389 | xfs_fileoff_t last_fsb; | |
541d7d3c | 390 | xfs_mount_t *mp = ip->i_mount; |
1da177e4 LT |
391 | int nimaps; |
392 | int zero_offset; | |
393 | int zero_len; | |
1da177e4 LT |
394 | int error = 0; |
395 | xfs_bmbt_irec_t imap; | |
1da177e4 | 396 | |
579aa9ca | 397 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); |
1da177e4 | 398 | |
24ee8088 ES |
399 | zero_offset = XFS_B_FSB_OFFSET(mp, isize); |
400 | if (zero_offset == 0) { | |
1da177e4 LT |
401 | /* |
402 | * There are no extra bytes in the last block on disk to | |
403 | * zero, so return. | |
404 | */ | |
405 | return 0; | |
406 | } | |
407 | ||
408 | last_fsb = XFS_B_TO_FSBT(mp, isize); | |
409 | nimaps = 1; | |
541d7d3c | 410 | error = xfs_bmapi(NULL, ip, last_fsb, 1, 0, NULL, 0, &imap, |
3e57ecf6 | 411 | &nimaps, NULL, NULL); |
1da177e4 LT |
412 | if (error) { |
413 | return error; | |
414 | } | |
415 | ASSERT(nimaps > 0); | |
416 | /* | |
417 | * If the block underlying isize is just a hole, then there | |
418 | * is nothing to zero. | |
419 | */ | |
420 | if (imap.br_startblock == HOLESTARTBLOCK) { | |
421 | return 0; | |
422 | } | |
423 | /* | |
424 | * Zero the part of the last block beyond the EOF, and write it | |
425 | * out sync. We need to drop the ilock while we do this so we | |
426 | * don't deadlock when the buffer cache calls back to us. | |
427 | */ | |
579aa9ca | 428 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
1da177e4 | 429 | |
24ee8088 | 430 | zero_len = mp->m_sb.sb_blocksize - zero_offset; |
68160161 LM |
431 | if (isize + zero_len > offset) |
432 | zero_len = offset - isize; | |
433 | error = xfs_iozero(ip, isize, zero_len); | |
1da177e4 | 434 | |
579aa9ca | 435 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
1da177e4 LT |
436 | ASSERT(error >= 0); |
437 | return error; | |
438 | } | |
439 | ||
440 | /* | |
441 | * Zero any on disk space between the current EOF and the new, | |
442 | * larger EOF. This handles the normal case of zeroing the remainder | |
443 | * of the last block in the file and the unusual case of zeroing blocks | |
444 | * out beyond the size of the file. This second case only happens | |
445 | * with fixed size extents and when the system crashes before the inode | |
446 | * size was updated but after blocks were allocated. If fill is set, | |
447 | * then any holes in the range are filled and zeroed. If not, the holes | |
448 | * are left alone as holes. | |
449 | */ | |
450 | ||
451 | int /* error (positive) */ | |
452 | xfs_zero_eof( | |
541d7d3c | 453 | xfs_inode_t *ip, |
1da177e4 | 454 | xfs_off_t offset, /* starting I/O offset */ |
68160161 | 455 | xfs_fsize_t isize) /* current inode size */ |
1da177e4 | 456 | { |
613d7043 | 457 | xfs_mount_t *mp = ip->i_mount; |
1da177e4 LT |
458 | xfs_fileoff_t start_zero_fsb; |
459 | xfs_fileoff_t end_zero_fsb; | |
1da177e4 LT |
460 | xfs_fileoff_t zero_count_fsb; |
461 | xfs_fileoff_t last_fsb; | |
68160161 LM |
462 | xfs_fileoff_t zero_off; |
463 | xfs_fsize_t zero_len; | |
1da177e4 LT |
464 | int nimaps; |
465 | int error = 0; | |
466 | xfs_bmbt_irec_t imap; | |
1da177e4 | 467 | |
579aa9ca | 468 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL)); |
24ee8088 | 469 | ASSERT(offset > isize); |
1da177e4 | 470 | |
1da177e4 LT |
471 | /* |
472 | * First handle zeroing the block on which isize resides. | |
473 | * We only zero a part of that block so it is handled specially. | |
474 | */ | |
541d7d3c | 475 | error = xfs_zero_last_block(ip, offset, isize); |
1da177e4 | 476 | if (error) { |
579aa9ca | 477 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL)); |
1da177e4 LT |
478 | return error; |
479 | } | |
480 | ||
481 | /* | |
482 | * Calculate the range between the new size and the old | |
483 | * where blocks needing to be zeroed may exist. To get the | |
484 | * block where the last byte in the file currently resides, | |
485 | * we need to subtract one from the size and truncate back | |
486 | * to a block boundary. We subtract 1 in case the size is | |
487 | * exactly on a block boundary. | |
488 | */ | |
489 | last_fsb = isize ? XFS_B_TO_FSBT(mp, isize - 1) : (xfs_fileoff_t)-1; | |
490 | start_zero_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)isize); | |
491 | end_zero_fsb = XFS_B_TO_FSBT(mp, offset - 1); | |
492 | ASSERT((xfs_sfiloff_t)last_fsb < (xfs_sfiloff_t)start_zero_fsb); | |
493 | if (last_fsb == end_zero_fsb) { | |
494 | /* | |
495 | * The size was only incremented on its last block. | |
496 | * We took care of that above, so just return. | |
497 | */ | |
498 | return 0; | |
499 | } | |
500 | ||
501 | ASSERT(start_zero_fsb <= end_zero_fsb); | |
1da177e4 LT |
502 | while (start_zero_fsb <= end_zero_fsb) { |
503 | nimaps = 1; | |
504 | zero_count_fsb = end_zero_fsb - start_zero_fsb + 1; | |
541d7d3c | 505 | error = xfs_bmapi(NULL, ip, start_zero_fsb, zero_count_fsb, |
3e57ecf6 | 506 | 0, NULL, 0, &imap, &nimaps, NULL, NULL); |
1da177e4 | 507 | if (error) { |
579aa9ca | 508 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL)); |
1da177e4 LT |
509 | return error; |
510 | } | |
511 | ASSERT(nimaps > 0); | |
512 | ||
513 | if (imap.br_state == XFS_EXT_UNWRITTEN || | |
514 | imap.br_startblock == HOLESTARTBLOCK) { | |
515 | /* | |
516 | * This loop handles initializing pages that were | |
517 | * partially initialized by the code below this | |
518 | * loop. It basically zeroes the part of the page | |
519 | * that sits on a hole and sets the page as P_HOLE | |
520 | * and calls remapf if it is a mapped file. | |
521 | */ | |
24ee8088 | 522 | start_zero_fsb = imap.br_startoff + imap.br_blockcount; |
1da177e4 LT |
523 | ASSERT(start_zero_fsb <= (end_zero_fsb + 1)); |
524 | continue; | |
525 | } | |
526 | ||
527 | /* | |
3d80ede4 | 528 | * There are blocks we need to zero. |
1da177e4 LT |
529 | * Drop the inode lock while we're doing the I/O. |
530 | * We'll still have the iolock to protect us. | |
531 | */ | |
579aa9ca | 532 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
1da177e4 | 533 | |
68160161 LM |
534 | zero_off = XFS_FSB_TO_B(mp, start_zero_fsb); |
535 | zero_len = XFS_FSB_TO_B(mp, imap.br_blockcount); | |
536 | ||
537 | if ((zero_off + zero_len) > offset) | |
538 | zero_len = offset - zero_off; | |
539 | ||
540 | error = xfs_iozero(ip, zero_off, zero_len); | |
1da177e4 LT |
541 | if (error) { |
542 | goto out_lock; | |
543 | } | |
544 | ||
3d80ede4 | 545 | start_zero_fsb = imap.br_startoff + imap.br_blockcount; |
1da177e4 LT |
546 | ASSERT(start_zero_fsb <= (end_zero_fsb + 1)); |
547 | ||
579aa9ca | 548 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
1da177e4 LT |
549 | } |
550 | ||
551 | return 0; | |
552 | ||
553 | out_lock: | |
579aa9ca | 554 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
1da177e4 LT |
555 | ASSERT(error >= 0); |
556 | return error; | |
557 | } | |
558 | ||
559 | ssize_t /* bytes written, or (-) error */ | |
560 | xfs_write( | |
993386c1 | 561 | struct xfs_inode *xip, |
1da177e4 LT |
562 | struct kiocb *iocb, |
563 | const struct iovec *iovp, | |
564 | unsigned int nsegs, | |
565 | loff_t *offset, | |
993386c1 | 566 | int ioflags) |
1da177e4 LT |
567 | { |
568 | struct file *file = iocb->ki_filp; | |
569 | struct address_space *mapping = file->f_mapping; | |
570 | struct inode *inode = mapping->host; | |
571 | unsigned long segs = nsegs; | |
1da177e4 LT |
572 | xfs_mount_t *mp; |
573 | ssize_t ret = 0, error = 0; | |
574 | xfs_fsize_t isize, new_size; | |
1da177e4 LT |
575 | int iolock; |
576 | int eventsent = 0; | |
1da177e4 LT |
577 | size_t ocount = 0, count; |
578 | loff_t pos; | |
2a329631 | 579 | int need_i_mutex; |
1da177e4 LT |
580 | |
581 | XFS_STATS_INC(xs_write_calls); | |
582 | ||
0ceb3314 DM |
583 | error = generic_segment_checks(iovp, &segs, &ocount, VERIFY_READ); |
584 | if (error) | |
585 | return error; | |
1da177e4 LT |
586 | |
587 | count = ocount; | |
588 | pos = *offset; | |
589 | ||
590 | if (count == 0) | |
591 | return 0; | |
592 | ||
613d7043 | 593 | mp = xip->i_mount; |
1da177e4 | 594 | |
b267ce99 | 595 | xfs_wait_for_freeze(mp, SB_FREEZE_WRITE); |
34327e13 | 596 | |
1da177e4 LT |
597 | if (XFS_FORCED_SHUTDOWN(mp)) |
598 | return -EIO; | |
599 | ||
1da177e4 | 600 | relock: |
2a329631 LM |
601 | if (ioflags & IO_ISDIRECT) { |
602 | iolock = XFS_IOLOCK_SHARED; | |
2a329631 LM |
603 | need_i_mutex = 0; |
604 | } else { | |
1da177e4 | 605 | iolock = XFS_IOLOCK_EXCL; |
2a329631 | 606 | need_i_mutex = 1; |
1b1dcc1b | 607 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
608 | } |
609 | ||
610 | xfs_ilock(xip, XFS_ILOCK_EXCL|iolock); | |
611 | ||
1da177e4 LT |
612 | start: |
613 | error = -generic_write_checks(file, &pos, &count, | |
614 | S_ISBLK(inode->i_mode)); | |
615 | if (error) { | |
616 | xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock); | |
a13828b1 | 617 | goto out_unlock_mutex; |
1da177e4 LT |
618 | } |
619 | ||
eb9df39d | 620 | if ((DM_EVENT_ENABLED(xip, DM_EVENT_WRITE) && |
1da177e4 | 621 | !(ioflags & IO_INVIS) && !eventsent)) { |
1da177e4 LT |
622 | int dmflags = FILP_DELAY_FLAG(file); |
623 | ||
a13828b1 | 624 | if (need_i_mutex) |
1b1dcc1b | 625 | dmflags |= DM_FLAGS_IMUX; |
1da177e4 LT |
626 | |
627 | xfs_iunlock(xip, XFS_ILOCK_EXCL); | |
bc4ac74a | 628 | error = XFS_SEND_DATA(xip->i_mount, DM_EVENT_WRITE, xip, |
126468b1 | 629 | pos, count, dmflags, &iolock); |
1da177e4 | 630 | if (error) { |
ba87ea69 | 631 | goto out_unlock_internal; |
1da177e4 LT |
632 | } |
633 | xfs_ilock(xip, XFS_ILOCK_EXCL); | |
634 | eventsent = 1; | |
635 | ||
636 | /* | |
c41564b5 | 637 | * The iolock was dropped and reacquired in XFS_SEND_DATA |
1da177e4 LT |
638 | * so we have to recheck the size when appending. |
639 | * We will only "goto start;" once, since having sent the | |
640 | * event prevents another call to XFS_SEND_DATA, which is | |
641 | * what allows the size to change in the first place. | |
642 | */ | |
71dfd5a3 | 643 | if ((file->f_flags & O_APPEND) && pos != xip->i_size) |
1da177e4 | 644 | goto start; |
1da177e4 LT |
645 | } |
646 | ||
71dfd5a3 LM |
647 | if (ioflags & IO_ISDIRECT) { |
648 | xfs_buftarg_t *target = | |
71ddabb9 | 649 | XFS_IS_REALTIME_INODE(xip) ? |
71dfd5a3 LM |
650 | mp->m_rtdev_targp : mp->m_ddev_targp; |
651 | ||
652 | if ((pos & target->bt_smask) || (count & target->bt_smask)) { | |
653 | xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock); | |
654 | return XFS_ERROR(-EINVAL); | |
655 | } | |
656 | ||
dcf49cc5 | 657 | if (!need_i_mutex && (mapping->nrpages || pos > xip->i_size)) { |
71dfd5a3 LM |
658 | xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock); |
659 | iolock = XFS_IOLOCK_EXCL; | |
71dfd5a3 LM |
660 | need_i_mutex = 1; |
661 | mutex_lock(&inode->i_mutex); | |
662 | xfs_ilock(xip, XFS_ILOCK_EXCL|iolock); | |
1da177e4 LT |
663 | goto start; |
664 | } | |
665 | } | |
666 | ||
71dfd5a3 LM |
667 | new_size = pos + count; |
668 | if (new_size > xip->i_size) | |
613d7043 | 669 | xip->i_new_size = new_size; |
71dfd5a3 | 670 | |
ec82687f DH |
671 | /* |
672 | * We're not supposed to change timestamps in readonly-mounted | |
673 | * filesystems. Throw it away if anyone asks us. | |
674 | */ | |
675 | if (likely(!(ioflags & IO_INVIS) && | |
676 | !mnt_want_write(file->f_path.mnt))) { | |
3a76c1ea | 677 | xfs_ichgtime(xip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); |
ec82687f | 678 | mnt_drop_write(file->f_path.mnt); |
1da177e4 LT |
679 | } |
680 | ||
681 | /* | |
682 | * If the offset is beyond the size of the file, we have a couple | |
683 | * of things to do. First, if there is already space allocated | |
684 | * we need to either create holes or zero the disk or ... | |
685 | * | |
686 | * If there is a page where the previous size lands, we need | |
687 | * to zero it out up to the new size. | |
688 | */ | |
689 | ||
ba87ea69 | 690 | if (pos > xip->i_size) { |
541d7d3c | 691 | error = xfs_zero_eof(xip, pos, xip->i_size); |
1da177e4 | 692 | if (error) { |
ba87ea69 LM |
693 | xfs_iunlock(xip, XFS_ILOCK_EXCL); |
694 | goto out_unlock_internal; | |
1da177e4 LT |
695 | } |
696 | } | |
697 | xfs_iunlock(xip, XFS_ILOCK_EXCL); | |
698 | ||
699 | /* | |
700 | * If we're writing the file then make sure to clear the | |
701 | * setuid and setgid bits if the process is not being run | |
702 | * by root. This keeps people from modifying setuid and | |
703 | * setgid binaries. | |
704 | */ | |
705 | ||
706 | if (((xip->i_d.di_mode & S_ISUID) || | |
707 | ((xip->i_d.di_mode & (S_ISGID | S_IXGRP)) == | |
708 | (S_ISGID | S_IXGRP))) && | |
709 | !capable(CAP_FSETID)) { | |
710 | error = xfs_write_clear_setuid(xip); | |
711 | if (likely(!error)) | |
2f1936b8 | 712 | error = -file_remove_suid(file); |
1da177e4 | 713 | if (unlikely(error)) { |
ba87ea69 | 714 | goto out_unlock_internal; |
1da177e4 LT |
715 | } |
716 | } | |
717 | ||
718 | retry: | |
719 | /* We can write back this queue in page reclaim */ | |
720 | current->backing_dev_info = mapping->backing_dev_info; | |
721 | ||
722 | if ((ioflags & IO_ISDIRECT)) { | |
dcf49cc5 | 723 | if (mapping->nrpages) { |
2a329631 | 724 | WARN_ON(need_i_mutex == 0); |
613d7043 | 725 | xfs_inval_cached_trace(xip, pos, -1, |
e6a4b37f | 726 | (pos & PAGE_CACHE_MASK), -1); |
739bfb2a | 727 | error = xfs_flushinval_pages(xip, |
e6a4b37f | 728 | (pos & PAGE_CACHE_MASK), |
1da177e4 | 729 | -1, FI_REMAPF_LOCKED); |
d3cf2094 LM |
730 | if (error) |
731 | goto out_unlock_internal; | |
1da177e4 LT |
732 | } |
733 | ||
a13828b1 | 734 | if (need_i_mutex) { |
1da177e4 | 735 | /* demote the lock now the cached pages are gone */ |
541d7d3c | 736 | xfs_ilock_demote(xip, XFS_IOLOCK_EXCL); |
1b1dcc1b | 737 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
738 | |
739 | iolock = XFS_IOLOCK_SHARED; | |
a13828b1 | 740 | need_i_mutex = 0; |
1da177e4 LT |
741 | } |
742 | ||
613d7043 | 743 | xfs_rw_enter_trace(XFS_DIOWR_ENTER, xip, (void *)iovp, segs, |
1da177e4 LT |
744 | *offset, ioflags); |
745 | ret = generic_file_direct_write(iocb, iovp, | |
746 | &segs, pos, offset, count, ocount); | |
747 | ||
748 | /* | |
749 | * direct-io write to a hole: fall through to buffered I/O | |
750 | * for completing the rest of the request. | |
751 | */ | |
752 | if (ret >= 0 && ret != count) { | |
753 | XFS_STATS_ADD(xs_write_bytes, ret); | |
754 | ||
755 | pos += ret; | |
756 | count -= ret; | |
757 | ||
1da177e4 LT |
758 | ioflags &= ~IO_ISDIRECT; |
759 | xfs_iunlock(xip, iolock); | |
760 | goto relock; | |
761 | } | |
762 | } else { | |
613d7043 | 763 | xfs_rw_enter_trace(XFS_WRITE_ENTER, xip, (void *)iovp, segs, |
1da177e4 LT |
764 | *offset, ioflags); |
765 | ret = generic_file_buffered_write(iocb, iovp, segs, | |
766 | pos, offset, count, ret); | |
767 | } | |
768 | ||
769 | current->backing_dev_info = NULL; | |
770 | ||
771 | if (ret == -EIOCBQUEUED && !(ioflags & IO_ISAIO)) | |
772 | ret = wait_on_sync_kiocb(iocb); | |
773 | ||
eb9df39d CH |
774 | if (ret == -ENOSPC && |
775 | DM_EVENT_ENABLED(xip, DM_EVENT_NOSPACE) && !(ioflags & IO_INVIS)) { | |
126468b1 | 776 | xfs_iunlock(xip, iolock); |
a13828b1 | 777 | if (need_i_mutex) |
1b1dcc1b | 778 | mutex_unlock(&inode->i_mutex); |
bc4ac74a CH |
779 | error = XFS_SEND_NAMESP(xip->i_mount, DM_EVENT_NOSPACE, xip, |
780 | DM_RIGHT_NULL, xip, DM_RIGHT_NULL, NULL, NULL, | |
1da177e4 | 781 | 0, 0, 0); /* Delay flag intentionally unused */ |
a13828b1 | 782 | if (need_i_mutex) |
1b1dcc1b | 783 | mutex_lock(&inode->i_mutex); |
126468b1 | 784 | xfs_ilock(xip, iolock); |
ba87ea69 LM |
785 | if (error) |
786 | goto out_unlock_internal; | |
787 | pos = xip->i_size; | |
1da177e4 LT |
788 | ret = 0; |
789 | goto retry; | |
790 | } | |
791 | ||
68bdb6ea YL |
792 | isize = i_size_read(inode); |
793 | if (unlikely(ret < 0 && ret != -EFAULT && *offset > isize)) | |
794 | *offset = isize; | |
795 | ||
ba87ea69 | 796 | if (*offset > xip->i_size) { |
1da177e4 | 797 | xfs_ilock(xip, XFS_ILOCK_EXCL); |
ba87ea69 LM |
798 | if (*offset > xip->i_size) |
799 | xip->i_size = *offset; | |
1da177e4 LT |
800 | xfs_iunlock(xip, XFS_ILOCK_EXCL); |
801 | } | |
802 | ||
803 | error = -ret; | |
804 | if (ret <= 0) | |
805 | goto out_unlock_internal; | |
806 | ||
807 | XFS_STATS_ADD(xs_write_bytes, ret); | |
808 | ||
809 | /* Handle various SYNC-type writes */ | |
810 | if ((file->f_flags & O_SYNC) || IS_SYNC(inode)) { | |
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); |
5903c495 | 816 | error2 = sync_page_range(inode, mapping, pos, ret); |
1da177e4 | 817 | if (!error) |
5903c495 | 818 | error = error2; |
ba87ea69 LM |
819 | if (need_i_mutex) |
820 | mutex_lock(&inode->i_mutex); | |
126468b1 | 821 | xfs_ilock(xip, iolock); |
5903c495 LM |
822 | error2 = xfs_write_sync_logforce(mp, xip); |
823 | if (!error) | |
824 | error = error2; | |
1da177e4 LT |
825 | } |
826 | ||
827 | out_unlock_internal: | |
613d7043 | 828 | if (xip->i_new_size) { |
ba87ea69 | 829 | xfs_ilock(xip, XFS_ILOCK_EXCL); |
613d7043 | 830 | xip->i_new_size = 0; |
ba87ea69 LM |
831 | /* |
832 | * If this was a direct or synchronous I/O that failed (such | |
833 | * as ENOSPC) then part of the I/O may have been written to | |
834 | * disk before the error occured. In this case the on-disk | |
835 | * file size may have been adjusted beyond the in-memory file | |
836 | * size and now needs to be truncated back. | |
837 | */ | |
838 | if (xip->i_d.di_size > xip->i_size) | |
839 | xip->i_d.di_size = xip->i_size; | |
840 | xfs_iunlock(xip, XFS_ILOCK_EXCL); | |
841 | } | |
126468b1 | 842 | xfs_iunlock(xip, iolock); |
a13828b1 NS |
843 | out_unlock_mutex: |
844 | if (need_i_mutex) | |
1b1dcc1b | 845 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
846 | return -error; |
847 | } | |
848 | ||
849 | /* | |
850 | * All xfs metadata buffers except log state machine buffers | |
851 | * get this attached as their b_bdstrat callback function. | |
852 | * This is so that we can catch a buffer | |
853 | * after prematurely unpinning it to forcibly shutdown the filesystem. | |
854 | */ | |
855 | int | |
856 | xfs_bdstrat_cb(struct xfs_buf *bp) | |
857 | { | |
858 | xfs_mount_t *mp; | |
859 | ||
860 | mp = XFS_BUF_FSPRIVATE3(bp, xfs_mount_t *); | |
861 | if (!XFS_FORCED_SHUTDOWN(mp)) { | |
ce8e922c | 862 | xfs_buf_iorequest(bp); |
1da177e4 LT |
863 | return 0; |
864 | } else { | |
865 | xfs_buftrace("XFS__BDSTRAT IOERROR", bp); | |
866 | /* | |
867 | * Metadata write that didn't get logged but | |
868 | * written delayed anyway. These aren't associated | |
869 | * with a transaction, and can be ignored. | |
870 | */ | |
871 | if (XFS_BUF_IODONE_FUNC(bp) == NULL && | |
872 | (XFS_BUF_ISREAD(bp)) == 0) | |
873 | return (xfs_bioerror_relse(bp)); | |
874 | else | |
875 | return (xfs_bioerror(bp)); | |
876 | } | |
877 | } | |
878 | ||
1da177e4 | 879 | /* |
d64e31a2 DC |
880 | * Wrapper around bdstrat so that we can stop data from going to disk in case |
881 | * we are shutting down the filesystem. Typically user data goes thru this | |
882 | * path; one of the exceptions is the superblock. | |
1da177e4 | 883 | */ |
d64e31a2 | 884 | void |
1da177e4 LT |
885 | xfsbdstrat( |
886 | struct xfs_mount *mp, | |
887 | struct xfs_buf *bp) | |
888 | { | |
889 | ASSERT(mp); | |
d4055947 | 890 | if (!XFS_FORCED_SHUTDOWN(mp)) { |
ce8e922c | 891 | xfs_buf_iorequest(bp); |
d4055947 DC |
892 | return; |
893 | } | |
1da177e4 LT |
894 | |
895 | xfs_buftrace("XFSBDSTRAT IOERROR", bp); | |
d64e31a2 | 896 | xfs_bioerror_relse(bp); |
1da177e4 LT |
897 | } |
898 | ||
899 | /* | |
900 | * If the underlying (data/log/rt) device is readonly, there are some | |
901 | * operations that cannot proceed. | |
902 | */ | |
903 | int | |
904 | xfs_dev_is_read_only( | |
905 | xfs_mount_t *mp, | |
906 | char *message) | |
907 | { | |
908 | if (xfs_readonly_buftarg(mp->m_ddev_targp) || | |
909 | xfs_readonly_buftarg(mp->m_logdev_targp) || | |
910 | (mp->m_rtdev_targp && xfs_readonly_buftarg(mp->m_rtdev_targp))) { | |
911 | cmn_err(CE_NOTE, | |
912 | "XFS: %s required on read-only device.", message); | |
913 | cmn_err(CE_NOTE, | |
914 | "XFS: write access unavailable, cannot proceed."); | |
915 | return EROFS; | |
916 | } | |
917 | return 0; | |
918 | } |