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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> | |
54 | #include <linux/writeback.h> | |
55 | ||
56 | ||
57 | #if defined(XFS_RW_TRACE) | |
58 | void | |
59 | xfs_rw_enter_trace( | |
60 | int tag, | |
61 | xfs_iocore_t *io, | |
62 | void *data, | |
63 | size_t segs, | |
64 | loff_t offset, | |
65 | int ioflags) | |
66 | { | |
67 | xfs_inode_t *ip = XFS_IO_INODE(io); | |
68 | ||
69 | if (ip->i_rwtrace == NULL) | |
70 | return; | |
71 | ktrace_enter(ip->i_rwtrace, | |
72 | (void *)(unsigned long)tag, | |
73 | (void *)ip, | |
74 | (void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)), | |
75 | (void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)), | |
76 | (void *)data, | |
77 | (void *)((unsigned long)segs), | |
78 | (void *)((unsigned long)((offset >> 32) & 0xffffffff)), | |
79 | (void *)((unsigned long)(offset & 0xffffffff)), | |
80 | (void *)((unsigned long)ioflags), | |
81 | (void *)((unsigned long)((io->io_new_size >> 32) & 0xffffffff)), | |
82 | (void *)((unsigned long)(io->io_new_size & 0xffffffff)), | |
f1fdc848 | 83 | (void *)((unsigned long)current_pid()), |
1da177e4 LT |
84 | (void *)NULL, |
85 | (void *)NULL, | |
86 | (void *)NULL, | |
87 | (void *)NULL); | |
88 | } | |
89 | ||
90 | void | |
91 | xfs_inval_cached_trace( | |
92 | xfs_iocore_t *io, | |
93 | xfs_off_t offset, | |
94 | xfs_off_t len, | |
95 | xfs_off_t first, | |
96 | xfs_off_t last) | |
97 | { | |
98 | xfs_inode_t *ip = XFS_IO_INODE(io); | |
99 | ||
100 | if (ip->i_rwtrace == NULL) | |
101 | return; | |
102 | ktrace_enter(ip->i_rwtrace, | |
103 | (void *)(__psint_t)XFS_INVAL_CACHED, | |
104 | (void *)ip, | |
105 | (void *)((unsigned long)((offset >> 32) & 0xffffffff)), | |
106 | (void *)((unsigned long)(offset & 0xffffffff)), | |
107 | (void *)((unsigned long)((len >> 32) & 0xffffffff)), | |
108 | (void *)((unsigned long)(len & 0xffffffff)), | |
109 | (void *)((unsigned long)((first >> 32) & 0xffffffff)), | |
110 | (void *)((unsigned long)(first & 0xffffffff)), | |
111 | (void *)((unsigned long)((last >> 32) & 0xffffffff)), | |
112 | (void *)((unsigned long)(last & 0xffffffff)), | |
f1fdc848 | 113 | (void *)((unsigned long)current_pid()), |
1da177e4 LT |
114 | (void *)NULL, |
115 | (void *)NULL, | |
116 | (void *)NULL, | |
117 | (void *)NULL, | |
118 | (void *)NULL); | |
119 | } | |
120 | #endif | |
121 | ||
122 | /* | |
123 | * xfs_iozero | |
124 | * | |
125 | * xfs_iozero clears the specified range of buffer supplied, | |
126 | * and marks all the affected blocks as valid and modified. If | |
127 | * an affected block is not allocated, it will be allocated. If | |
128 | * an affected block is not completely overwritten, and is not | |
129 | * valid before the operation, it will be read from disk before | |
130 | * being partially zeroed. | |
131 | */ | |
132 | STATIC int | |
133 | xfs_iozero( | |
134 | struct inode *ip, /* inode */ | |
135 | loff_t pos, /* offset in file */ | |
68160161 | 136 | size_t count) /* size of data to zero */ |
1da177e4 LT |
137 | { |
138 | unsigned bytes; | |
139 | struct page *page; | |
140 | struct address_space *mapping; | |
1da177e4 LT |
141 | int status; |
142 | ||
143 | mapping = ip->i_mapping; | |
144 | do { | |
145 | unsigned long index, offset; | |
146 | ||
147 | offset = (pos & (PAGE_CACHE_SIZE -1)); /* Within page */ | |
148 | index = pos >> PAGE_CACHE_SHIFT; | |
149 | bytes = PAGE_CACHE_SIZE - offset; | |
150 | if (bytes > count) | |
151 | bytes = count; | |
152 | ||
153 | status = -ENOMEM; | |
154 | page = grab_cache_page(mapping, index); | |
155 | if (!page) | |
156 | break; | |
157 | ||
1da177e4 LT |
158 | status = mapping->a_ops->prepare_write(NULL, page, offset, |
159 | offset + bytes); | |
e7ff6aed | 160 | if (status) |
1da177e4 | 161 | goto unlock; |
1da177e4 | 162 | |
700716c8 | 163 | zero_user_page(page, offset, bytes, KM_USER0); |
e7ff6aed | 164 | |
1da177e4 LT |
165 | status = mapping->a_ops->commit_write(NULL, page, offset, |
166 | offset + bytes); | |
167 | if (!status) { | |
168 | pos += bytes; | |
169 | count -= bytes; | |
1da177e4 LT |
170 | } |
171 | ||
172 | unlock: | |
1da177e4 LT |
173 | unlock_page(page); |
174 | page_cache_release(page); | |
175 | if (status) | |
176 | break; | |
177 | } while (count); | |
178 | ||
179 | return (-status); | |
180 | } | |
181 | ||
1da177e4 LT |
182 | ssize_t /* bytes read, or (-) error */ |
183 | xfs_read( | |
993386c1 | 184 | xfs_inode_t *ip, |
1da177e4 LT |
185 | struct kiocb *iocb, |
186 | const struct iovec *iovp, | |
187 | unsigned int segs, | |
188 | loff_t *offset, | |
993386c1 | 189 | int ioflags) |
1da177e4 LT |
190 | { |
191 | struct file *file = iocb->ki_filp; | |
192 | struct inode *inode = file->f_mapping->host; | |
993386c1 CH |
193 | bhv_vnode_t *vp = XFS_ITOV(ip); |
194 | xfs_mount_t *mp = ip->i_mount; | |
1da177e4 | 195 | size_t size = 0; |
d3cf2094 | 196 | ssize_t ret = 0; |
1da177e4 | 197 | xfs_fsize_t n; |
1da177e4 LT |
198 | unsigned long seg; |
199 | ||
1da177e4 LT |
200 | |
201 | XFS_STATS_INC(xs_read_calls); | |
202 | ||
203 | /* START copy & waste from filemap.c */ | |
204 | for (seg = 0; seg < segs; seg++) { | |
205 | const struct iovec *iv = &iovp[seg]; | |
206 | ||
207 | /* | |
208 | * If any segment has a negative length, or the cumulative | |
209 | * length ever wraps negative then return -EINVAL. | |
210 | */ | |
211 | size += iv->iov_len; | |
212 | if (unlikely((ssize_t)(size|iv->iov_len) < 0)) | |
213 | return XFS_ERROR(-EINVAL); | |
214 | } | |
215 | /* END copy & waste from filemap.c */ | |
216 | ||
217 | if (unlikely(ioflags & IO_ISDIRECT)) { | |
218 | xfs_buftarg_t *target = | |
219 | (ip->i_d.di_flags & XFS_DIFLAG_REALTIME) ? | |
220 | mp->m_rtdev_targp : mp->m_ddev_targp; | |
ce8e922c NS |
221 | if ((*offset & target->bt_smask) || |
222 | (size & target->bt_smask)) { | |
ba87ea69 | 223 | if (*offset == ip->i_size) { |
1da177e4 LT |
224 | return (0); |
225 | } | |
226 | return -XFS_ERROR(EINVAL); | |
227 | } | |
228 | } | |
229 | ||
230 | n = XFS_MAXIOFFSET(mp) - *offset; | |
231 | if ((n <= 0) || (size == 0)) | |
232 | return 0; | |
233 | ||
234 | if (n < size) | |
235 | size = n; | |
236 | ||
a13828b1 | 237 | if (XFS_FORCED_SHUTDOWN(mp)) |
1da177e4 | 238 | return -EIO; |
1da177e4 LT |
239 | |
240 | if (unlikely(ioflags & IO_ISDIRECT)) | |
1b1dcc1b | 241 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
242 | xfs_ilock(ip, XFS_IOLOCK_SHARED); |
243 | ||
eb9df39d | 244 | if (DM_EVENT_ENABLED(ip, DM_EVENT_READ) && !(ioflags & IO_INVIS)) { |
8285fb58 | 245 | bhv_vrwlock_t locktype = VRWLOCK_READ; |
e1a40fa9 | 246 | int dmflags = FILP_DELAY_FLAG(file) | DM_SEM_FLAG_RD(ioflags); |
1da177e4 | 247 | |
993386c1 | 248 | ret = -XFS_SEND_DATA(mp, DM_EVENT_READ, vp, *offset, size, |
e1a40fa9 | 249 | dmflags, &locktype); |
1da177e4 LT |
250 | if (ret) { |
251 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); | |
721259bc LM |
252 | if (unlikely(ioflags & IO_ISDIRECT)) |
253 | mutex_unlock(&inode->i_mutex); | |
254 | return ret; | |
1da177e4 LT |
255 | } |
256 | } | |
257 | ||
edcd4bce NS |
258 | if (unlikely(ioflags & IO_ISDIRECT)) { |
259 | if (VN_CACHED(vp)) | |
739bfb2a CH |
260 | ret = xfs_flushinval_pages(ip, |
261 | ctooff(offtoct(*offset)), | |
262 | -1, FI_REMAPF_LOCKED); | |
721259bc | 263 | mutex_unlock(&inode->i_mutex); |
d3cf2094 LM |
264 | if (ret) { |
265 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); | |
266 | return ret; | |
267 | } | |
edcd4bce | 268 | } |
721259bc | 269 | |
1da177e4 LT |
270 | xfs_rw_enter_trace(XFS_READ_ENTER, &ip->i_iocore, |
271 | (void *)iovp, segs, *offset, ioflags); | |
543ade1f BP |
272 | |
273 | iocb->ki_pos = *offset; | |
274 | ret = generic_file_aio_read(iocb, iovp, segs, *offset); | |
1da177e4 LT |
275 | if (ret == -EIOCBQUEUED && !(ioflags & IO_ISAIO)) |
276 | ret = wait_on_sync_kiocb(iocb); | |
277 | if (ret > 0) | |
278 | XFS_STATS_ADD(xs_read_bytes, ret); | |
279 | ||
280 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); | |
1da177e4 LT |
281 | return ret; |
282 | } | |
283 | ||
1b895840 NS |
284 | ssize_t |
285 | xfs_splice_read( | |
993386c1 | 286 | xfs_inode_t *ip, |
1b895840 | 287 | struct file *infilp, |
cbb7e577 | 288 | loff_t *ppos, |
3a326a2c | 289 | struct pipe_inode_info *pipe, |
1b895840 NS |
290 | size_t count, |
291 | int flags, | |
993386c1 | 292 | int ioflags) |
1b895840 | 293 | { |
993386c1 | 294 | bhv_vnode_t *vp = XFS_ITOV(ip); |
1b895840 NS |
295 | xfs_mount_t *mp = ip->i_mount; |
296 | ssize_t ret; | |
1da177e4 | 297 | |
1b895840 NS |
298 | XFS_STATS_INC(xs_read_calls); |
299 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) | |
300 | return -EIO; | |
301 | ||
302 | xfs_ilock(ip, XFS_IOLOCK_SHARED); | |
303 | ||
eb9df39d | 304 | if (DM_EVENT_ENABLED(ip, DM_EVENT_READ) && !(ioflags & IO_INVIS)) { |
8285fb58 | 305 | bhv_vrwlock_t locktype = VRWLOCK_READ; |
1b895840 NS |
306 | int error; |
307 | ||
993386c1 | 308 | error = XFS_SEND_DATA(mp, DM_EVENT_READ, vp, *ppos, count, |
1b895840 NS |
309 | FILP_DELAY_FLAG(infilp), &locktype); |
310 | if (error) { | |
311 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); | |
312 | return -error; | |
313 | } | |
314 | } | |
315 | xfs_rw_enter_trace(XFS_SPLICE_READ_ENTER, &ip->i_iocore, | |
cbb7e577 JA |
316 | pipe, count, *ppos, ioflags); |
317 | ret = generic_file_splice_read(infilp, ppos, pipe, count, flags); | |
1da177e4 LT |
318 | if (ret > 0) |
319 | XFS_STATS_ADD(xs_read_bytes, ret); | |
320 | ||
1b895840 NS |
321 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); |
322 | return ret; | |
323 | } | |
324 | ||
325 | ssize_t | |
326 | xfs_splice_write( | |
993386c1 | 327 | xfs_inode_t *ip, |
3a326a2c | 328 | struct pipe_inode_info *pipe, |
1b895840 | 329 | struct file *outfilp, |
cbb7e577 | 330 | loff_t *ppos, |
1b895840 NS |
331 | size_t count, |
332 | int flags, | |
993386c1 | 333 | int ioflags) |
1b895840 | 334 | { |
993386c1 | 335 | bhv_vnode_t *vp = XFS_ITOV(ip); |
1b895840 | 336 | xfs_mount_t *mp = ip->i_mount; |
ba87ea69 | 337 | xfs_iocore_t *io = &ip->i_iocore; |
1b895840 | 338 | ssize_t ret; |
0a8d17d0 | 339 | struct inode *inode = outfilp->f_mapping->host; |
ba87ea69 | 340 | xfs_fsize_t isize, new_size; |
1b895840 NS |
341 | |
342 | XFS_STATS_INC(xs_write_calls); | |
343 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) | |
344 | return -EIO; | |
345 | ||
346 | xfs_ilock(ip, XFS_IOLOCK_EXCL); | |
347 | ||
eb9df39d | 348 | if (DM_EVENT_ENABLED(ip, DM_EVENT_WRITE) && !(ioflags & IO_INVIS)) { |
8285fb58 | 349 | bhv_vrwlock_t locktype = VRWLOCK_WRITE; |
1b895840 NS |
350 | int error; |
351 | ||
993386c1 | 352 | error = XFS_SEND_DATA(mp, DM_EVENT_WRITE, vp, *ppos, count, |
1b895840 NS |
353 | FILP_DELAY_FLAG(outfilp), &locktype); |
354 | if (error) { | |
355 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); | |
356 | return -error; | |
357 | } | |
358 | } | |
ba87ea69 LM |
359 | |
360 | new_size = *ppos + count; | |
361 | ||
362 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
363 | if (new_size > ip->i_size) | |
364 | io->io_new_size = new_size; | |
365 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
366 | ||
1b895840 | 367 | xfs_rw_enter_trace(XFS_SPLICE_WRITE_ENTER, &ip->i_iocore, |
cbb7e577 JA |
368 | pipe, count, *ppos, ioflags); |
369 | ret = generic_file_splice_write(pipe, outfilp, ppos, count, flags); | |
1b895840 NS |
370 | if (ret > 0) |
371 | XFS_STATS_ADD(xs_write_bytes, ret); | |
372 | ||
0a8d17d0 DC |
373 | isize = i_size_read(inode); |
374 | if (unlikely(ret < 0 && ret != -EFAULT && *ppos > isize)) | |
375 | *ppos = isize; | |
376 | ||
ba87ea69 | 377 | if (*ppos > ip->i_size) { |
0a8d17d0 | 378 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
ba87ea69 LM |
379 | if (*ppos > ip->i_size) |
380 | ip->i_size = *ppos; | |
381 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
382 | } | |
383 | ||
384 | if (io->io_new_size) { | |
385 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
386 | io->io_new_size = 0; | |
387 | if (ip->i_d.di_size > ip->i_size) | |
388 | ip->i_d.di_size = ip->i_size; | |
0a8d17d0 DC |
389 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
390 | } | |
1b895840 | 391 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); |
1da177e4 LT |
392 | return ret; |
393 | } | |
394 | ||
395 | /* | |
396 | * This routine is called to handle zeroing any space in the last | |
397 | * block of the file that is beyond the EOF. We do this since the | |
398 | * size is being increased without writing anything to that block | |
399 | * and we don't want anyone to read the garbage on the disk. | |
400 | */ | |
401 | STATIC int /* error (positive) */ | |
402 | xfs_zero_last_block( | |
403 | struct inode *ip, | |
404 | xfs_iocore_t *io, | |
68160161 LM |
405 | xfs_fsize_t offset, |
406 | xfs_fsize_t isize) | |
1da177e4 LT |
407 | { |
408 | xfs_fileoff_t last_fsb; | |
1b895840 | 409 | xfs_mount_t *mp = io->io_mount; |
1da177e4 LT |
410 | int nimaps; |
411 | int zero_offset; | |
412 | int zero_len; | |
1da177e4 LT |
413 | int error = 0; |
414 | xfs_bmbt_irec_t imap; | |
1da177e4 LT |
415 | |
416 | ASSERT(ismrlocked(io->io_lock, MR_UPDATE) != 0); | |
1da177e4 | 417 | |
24ee8088 ES |
418 | zero_offset = XFS_B_FSB_OFFSET(mp, isize); |
419 | if (zero_offset == 0) { | |
1da177e4 LT |
420 | /* |
421 | * There are no extra bytes in the last block on disk to | |
422 | * zero, so return. | |
423 | */ | |
424 | return 0; | |
425 | } | |
426 | ||
427 | last_fsb = XFS_B_TO_FSBT(mp, isize); | |
428 | nimaps = 1; | |
429 | error = XFS_BMAPI(mp, NULL, io, last_fsb, 1, 0, NULL, 0, &imap, | |
3e57ecf6 | 430 | &nimaps, NULL, NULL); |
1da177e4 LT |
431 | if (error) { |
432 | return error; | |
433 | } | |
434 | ASSERT(nimaps > 0); | |
435 | /* | |
436 | * If the block underlying isize is just a hole, then there | |
437 | * is nothing to zero. | |
438 | */ | |
439 | if (imap.br_startblock == HOLESTARTBLOCK) { | |
440 | return 0; | |
441 | } | |
442 | /* | |
443 | * Zero the part of the last block beyond the EOF, and write it | |
444 | * out sync. We need to drop the ilock while we do this so we | |
445 | * don't deadlock when the buffer cache calls back to us. | |
446 | */ | |
447 | XFS_IUNLOCK(mp, io, XFS_ILOCK_EXCL| XFS_EXTSIZE_RD); | |
1da177e4 | 448 | |
24ee8088 | 449 | zero_len = mp->m_sb.sb_blocksize - zero_offset; |
68160161 LM |
450 | if (isize + zero_len > offset) |
451 | zero_len = offset - isize; | |
452 | error = xfs_iozero(ip, isize, zero_len); | |
1da177e4 LT |
453 | |
454 | XFS_ILOCK(mp, io, XFS_ILOCK_EXCL|XFS_EXTSIZE_RD); | |
455 | ASSERT(error >= 0); | |
456 | return error; | |
457 | } | |
458 | ||
459 | /* | |
460 | * Zero any on disk space between the current EOF and the new, | |
461 | * larger EOF. This handles the normal case of zeroing the remainder | |
462 | * of the last block in the file and the unusual case of zeroing blocks | |
463 | * out beyond the size of the file. This second case only happens | |
464 | * with fixed size extents and when the system crashes before the inode | |
465 | * size was updated but after blocks were allocated. If fill is set, | |
466 | * then any holes in the range are filled and zeroed. If not, the holes | |
467 | * are left alone as holes. | |
468 | */ | |
469 | ||
470 | int /* error (positive) */ | |
471 | xfs_zero_eof( | |
67fcaa73 | 472 | bhv_vnode_t *vp, |
1da177e4 LT |
473 | xfs_iocore_t *io, |
474 | xfs_off_t offset, /* starting I/O offset */ | |
68160161 | 475 | xfs_fsize_t isize) /* current inode size */ |
1da177e4 | 476 | { |
ec86dc02 | 477 | struct inode *ip = vn_to_inode(vp); |
1da177e4 LT |
478 | xfs_fileoff_t start_zero_fsb; |
479 | xfs_fileoff_t end_zero_fsb; | |
1da177e4 LT |
480 | xfs_fileoff_t zero_count_fsb; |
481 | xfs_fileoff_t last_fsb; | |
68160161 LM |
482 | xfs_fileoff_t zero_off; |
483 | xfs_fsize_t zero_len; | |
1b895840 | 484 | xfs_mount_t *mp = io->io_mount; |
1da177e4 LT |
485 | int nimaps; |
486 | int error = 0; | |
487 | xfs_bmbt_irec_t imap; | |
1da177e4 LT |
488 | |
489 | ASSERT(ismrlocked(io->io_lock, MR_UPDATE)); | |
490 | ASSERT(ismrlocked(io->io_iolock, MR_UPDATE)); | |
24ee8088 | 491 | ASSERT(offset > isize); |
1da177e4 | 492 | |
1da177e4 LT |
493 | /* |
494 | * First handle zeroing the block on which isize resides. | |
495 | * We only zero a part of that block so it is handled specially. | |
496 | */ | |
68160161 | 497 | error = xfs_zero_last_block(ip, io, offset, isize); |
1da177e4 LT |
498 | if (error) { |
499 | ASSERT(ismrlocked(io->io_lock, MR_UPDATE)); | |
500 | ASSERT(ismrlocked(io->io_iolock, MR_UPDATE)); | |
501 | return error; | |
502 | } | |
503 | ||
504 | /* | |
505 | * Calculate the range between the new size and the old | |
506 | * where blocks needing to be zeroed may exist. To get the | |
507 | * block where the last byte in the file currently resides, | |
508 | * we need to subtract one from the size and truncate back | |
509 | * to a block boundary. We subtract 1 in case the size is | |
510 | * exactly on a block boundary. | |
511 | */ | |
512 | last_fsb = isize ? XFS_B_TO_FSBT(mp, isize - 1) : (xfs_fileoff_t)-1; | |
513 | start_zero_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)isize); | |
514 | end_zero_fsb = XFS_B_TO_FSBT(mp, offset - 1); | |
515 | ASSERT((xfs_sfiloff_t)last_fsb < (xfs_sfiloff_t)start_zero_fsb); | |
516 | if (last_fsb == end_zero_fsb) { | |
517 | /* | |
518 | * The size was only incremented on its last block. | |
519 | * We took care of that above, so just return. | |
520 | */ | |
521 | return 0; | |
522 | } | |
523 | ||
524 | ASSERT(start_zero_fsb <= end_zero_fsb); | |
1da177e4 LT |
525 | while (start_zero_fsb <= end_zero_fsb) { |
526 | nimaps = 1; | |
527 | zero_count_fsb = end_zero_fsb - start_zero_fsb + 1; | |
528 | error = XFS_BMAPI(mp, NULL, io, start_zero_fsb, zero_count_fsb, | |
3e57ecf6 | 529 | 0, NULL, 0, &imap, &nimaps, NULL, NULL); |
1da177e4 LT |
530 | if (error) { |
531 | ASSERT(ismrlocked(io->io_lock, MR_UPDATE)); | |
532 | ASSERT(ismrlocked(io->io_iolock, MR_UPDATE)); | |
533 | return error; | |
534 | } | |
535 | ASSERT(nimaps > 0); | |
536 | ||
537 | if (imap.br_state == XFS_EXT_UNWRITTEN || | |
538 | imap.br_startblock == HOLESTARTBLOCK) { | |
539 | /* | |
540 | * This loop handles initializing pages that were | |
541 | * partially initialized by the code below this | |
542 | * loop. It basically zeroes the part of the page | |
543 | * that sits on a hole and sets the page as P_HOLE | |
544 | * and calls remapf if it is a mapped file. | |
545 | */ | |
24ee8088 | 546 | start_zero_fsb = imap.br_startoff + imap.br_blockcount; |
1da177e4 LT |
547 | ASSERT(start_zero_fsb <= (end_zero_fsb + 1)); |
548 | continue; | |
549 | } | |
550 | ||
551 | /* | |
3d80ede4 | 552 | * There are blocks we need to zero. |
1da177e4 LT |
553 | * Drop the inode lock while we're doing the I/O. |
554 | * We'll still have the iolock to protect us. | |
555 | */ | |
556 | XFS_IUNLOCK(mp, io, XFS_ILOCK_EXCL|XFS_EXTSIZE_RD); | |
557 | ||
68160161 LM |
558 | zero_off = XFS_FSB_TO_B(mp, start_zero_fsb); |
559 | zero_len = XFS_FSB_TO_B(mp, imap.br_blockcount); | |
560 | ||
561 | if ((zero_off + zero_len) > offset) | |
562 | zero_len = offset - zero_off; | |
563 | ||
564 | error = xfs_iozero(ip, zero_off, zero_len); | |
1da177e4 LT |
565 | if (error) { |
566 | goto out_lock; | |
567 | } | |
568 | ||
3d80ede4 | 569 | start_zero_fsb = imap.br_startoff + imap.br_blockcount; |
1da177e4 LT |
570 | ASSERT(start_zero_fsb <= (end_zero_fsb + 1)); |
571 | ||
572 | XFS_ILOCK(mp, io, XFS_ILOCK_EXCL|XFS_EXTSIZE_RD); | |
573 | } | |
574 | ||
575 | return 0; | |
576 | ||
577 | out_lock: | |
578 | ||
579 | XFS_ILOCK(mp, io, XFS_ILOCK_EXCL|XFS_EXTSIZE_RD); | |
580 | ASSERT(error >= 0); | |
581 | return error; | |
582 | } | |
583 | ||
584 | ssize_t /* bytes written, or (-) error */ | |
585 | xfs_write( | |
993386c1 | 586 | struct xfs_inode *xip, |
1da177e4 LT |
587 | struct kiocb *iocb, |
588 | const struct iovec *iovp, | |
589 | unsigned int nsegs, | |
590 | loff_t *offset, | |
993386c1 | 591 | int ioflags) |
1da177e4 LT |
592 | { |
593 | struct file *file = iocb->ki_filp; | |
594 | struct address_space *mapping = file->f_mapping; | |
595 | struct inode *inode = mapping->host; | |
993386c1 | 596 | bhv_vnode_t *vp = XFS_ITOV(xip); |
1da177e4 | 597 | unsigned long segs = nsegs; |
1da177e4 LT |
598 | xfs_mount_t *mp; |
599 | ssize_t ret = 0, error = 0; | |
600 | xfs_fsize_t isize, new_size; | |
601 | xfs_iocore_t *io; | |
1da177e4 LT |
602 | int iolock; |
603 | int eventsent = 0; | |
8285fb58 | 604 | bhv_vrwlock_t locktype; |
1da177e4 LT |
605 | size_t ocount = 0, count; |
606 | loff_t pos; | |
2a329631 | 607 | int need_i_mutex; |
1da177e4 LT |
608 | |
609 | XFS_STATS_INC(xs_write_calls); | |
610 | ||
0ceb3314 DM |
611 | error = generic_segment_checks(iovp, &segs, &ocount, VERIFY_READ); |
612 | if (error) | |
613 | return error; | |
1da177e4 LT |
614 | |
615 | count = ocount; | |
616 | pos = *offset; | |
617 | ||
618 | if (count == 0) | |
619 | return 0; | |
620 | ||
621 | io = &xip->i_iocore; | |
622 | mp = io->io_mount; | |
623 | ||
b267ce99 | 624 | xfs_wait_for_freeze(mp, SB_FREEZE_WRITE); |
34327e13 | 625 | |
1da177e4 LT |
626 | if (XFS_FORCED_SHUTDOWN(mp)) |
627 | return -EIO; | |
628 | ||
1da177e4 | 629 | relock: |
2a329631 LM |
630 | if (ioflags & IO_ISDIRECT) { |
631 | iolock = XFS_IOLOCK_SHARED; | |
632 | locktype = VRWLOCK_WRITE_DIRECT; | |
633 | need_i_mutex = 0; | |
634 | } else { | |
1da177e4 LT |
635 | iolock = XFS_IOLOCK_EXCL; |
636 | locktype = VRWLOCK_WRITE; | |
2a329631 | 637 | need_i_mutex = 1; |
1b1dcc1b | 638 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
639 | } |
640 | ||
641 | xfs_ilock(xip, XFS_ILOCK_EXCL|iolock); | |
642 | ||
1da177e4 LT |
643 | start: |
644 | error = -generic_write_checks(file, &pos, &count, | |
645 | S_ISBLK(inode->i_mode)); | |
646 | if (error) { | |
647 | xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock); | |
a13828b1 | 648 | goto out_unlock_mutex; |
1da177e4 LT |
649 | } |
650 | ||
eb9df39d | 651 | if ((DM_EVENT_ENABLED(xip, DM_EVENT_WRITE) && |
1da177e4 | 652 | !(ioflags & IO_INVIS) && !eventsent)) { |
1da177e4 LT |
653 | int dmflags = FILP_DELAY_FLAG(file); |
654 | ||
a13828b1 | 655 | if (need_i_mutex) |
1b1dcc1b | 656 | dmflags |= DM_FLAGS_IMUX; |
1da177e4 LT |
657 | |
658 | xfs_iunlock(xip, XFS_ILOCK_EXCL); | |
659 | error = XFS_SEND_DATA(xip->i_mount, DM_EVENT_WRITE, vp, | |
660 | pos, count, | |
661 | dmflags, &locktype); | |
662 | if (error) { | |
ba87ea69 | 663 | goto out_unlock_internal; |
1da177e4 LT |
664 | } |
665 | xfs_ilock(xip, XFS_ILOCK_EXCL); | |
666 | eventsent = 1; | |
667 | ||
668 | /* | |
c41564b5 | 669 | * The iolock was dropped and reacquired in XFS_SEND_DATA |
1da177e4 LT |
670 | * so we have to recheck the size when appending. |
671 | * We will only "goto start;" once, since having sent the | |
672 | * event prevents another call to XFS_SEND_DATA, which is | |
673 | * what allows the size to change in the first place. | |
674 | */ | |
71dfd5a3 | 675 | if ((file->f_flags & O_APPEND) && pos != xip->i_size) |
1da177e4 | 676 | goto start; |
1da177e4 LT |
677 | } |
678 | ||
71dfd5a3 LM |
679 | if (ioflags & IO_ISDIRECT) { |
680 | xfs_buftarg_t *target = | |
681 | (xip->i_d.di_flags & XFS_DIFLAG_REALTIME) ? | |
682 | mp->m_rtdev_targp : mp->m_ddev_targp; | |
683 | ||
684 | if ((pos & target->bt_smask) || (count & target->bt_smask)) { | |
685 | xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock); | |
686 | return XFS_ERROR(-EINVAL); | |
687 | } | |
688 | ||
689 | if (!need_i_mutex && (VN_CACHED(vp) || pos > xip->i_size)) { | |
690 | xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock); | |
691 | iolock = XFS_IOLOCK_EXCL; | |
692 | locktype = VRWLOCK_WRITE; | |
693 | need_i_mutex = 1; | |
694 | mutex_lock(&inode->i_mutex); | |
695 | xfs_ilock(xip, XFS_ILOCK_EXCL|iolock); | |
1da177e4 LT |
696 | goto start; |
697 | } | |
698 | } | |
699 | ||
71dfd5a3 LM |
700 | new_size = pos + count; |
701 | if (new_size > xip->i_size) | |
702 | io->io_new_size = new_size; | |
703 | ||
4aeb664c | 704 | if (likely(!(ioflags & IO_INVIS))) { |
870f4817 | 705 | file_update_time(file); |
4aeb664c NS |
706 | xfs_ichgtime_fast(xip, inode, |
707 | XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); | |
1da177e4 LT |
708 | } |
709 | ||
710 | /* | |
711 | * If the offset is beyond the size of the file, we have a couple | |
712 | * of things to do. First, if there is already space allocated | |
713 | * we need to either create holes or zero the disk or ... | |
714 | * | |
715 | * If there is a page where the previous size lands, we need | |
716 | * to zero it out up to the new size. | |
717 | */ | |
718 | ||
ba87ea69 | 719 | if (pos > xip->i_size) { |
993386c1 | 720 | error = xfs_zero_eof(vp, io, pos, xip->i_size); |
1da177e4 | 721 | if (error) { |
ba87ea69 LM |
722 | xfs_iunlock(xip, XFS_ILOCK_EXCL); |
723 | goto out_unlock_internal; | |
1da177e4 LT |
724 | } |
725 | } | |
726 | xfs_iunlock(xip, XFS_ILOCK_EXCL); | |
727 | ||
728 | /* | |
729 | * If we're writing the file then make sure to clear the | |
730 | * setuid and setgid bits if the process is not being run | |
731 | * by root. This keeps people from modifying setuid and | |
732 | * setgid binaries. | |
733 | */ | |
734 | ||
735 | if (((xip->i_d.di_mode & S_ISUID) || | |
736 | ((xip->i_d.di_mode & (S_ISGID | S_IXGRP)) == | |
737 | (S_ISGID | S_IXGRP))) && | |
738 | !capable(CAP_FSETID)) { | |
739 | error = xfs_write_clear_setuid(xip); | |
740 | if (likely(!error)) | |
e678fb0d | 741 | error = -remove_suid(file->f_path.dentry); |
1da177e4 | 742 | if (unlikely(error)) { |
ba87ea69 | 743 | goto out_unlock_internal; |
1da177e4 LT |
744 | } |
745 | } | |
746 | ||
747 | retry: | |
748 | /* We can write back this queue in page reclaim */ | |
749 | current->backing_dev_info = mapping->backing_dev_info; | |
750 | ||
751 | if ((ioflags & IO_ISDIRECT)) { | |
2a329631 LM |
752 | if (VN_CACHED(vp)) { |
753 | WARN_ON(need_i_mutex == 0); | |
1da177e4 LT |
754 | xfs_inval_cached_trace(io, pos, -1, |
755 | ctooff(offtoct(pos)), -1); | |
739bfb2a CH |
756 | error = xfs_flushinval_pages(xip, |
757 | ctooff(offtoct(pos)), | |
1da177e4 | 758 | -1, FI_REMAPF_LOCKED); |
d3cf2094 LM |
759 | if (error) |
760 | goto out_unlock_internal; | |
1da177e4 LT |
761 | } |
762 | ||
a13828b1 | 763 | if (need_i_mutex) { |
1da177e4 LT |
764 | /* demote the lock now the cached pages are gone */ |
765 | XFS_ILOCK_DEMOTE(mp, io, XFS_IOLOCK_EXCL); | |
1b1dcc1b | 766 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
767 | |
768 | iolock = XFS_IOLOCK_SHARED; | |
769 | locktype = VRWLOCK_WRITE_DIRECT; | |
a13828b1 | 770 | need_i_mutex = 0; |
1da177e4 LT |
771 | } |
772 | ||
773 | xfs_rw_enter_trace(XFS_DIOWR_ENTER, io, (void *)iovp, segs, | |
774 | *offset, ioflags); | |
775 | ret = generic_file_direct_write(iocb, iovp, | |
776 | &segs, pos, offset, count, ocount); | |
777 | ||
778 | /* | |
779 | * direct-io write to a hole: fall through to buffered I/O | |
780 | * for completing the rest of the request. | |
781 | */ | |
782 | if (ret >= 0 && ret != count) { | |
783 | XFS_STATS_ADD(xs_write_bytes, ret); | |
784 | ||
785 | pos += ret; | |
786 | count -= ret; | |
787 | ||
1da177e4 LT |
788 | ioflags &= ~IO_ISDIRECT; |
789 | xfs_iunlock(xip, iolock); | |
790 | goto relock; | |
791 | } | |
792 | } else { | |
793 | xfs_rw_enter_trace(XFS_WRITE_ENTER, io, (void *)iovp, segs, | |
794 | *offset, ioflags); | |
795 | ret = generic_file_buffered_write(iocb, iovp, segs, | |
796 | pos, offset, count, ret); | |
797 | } | |
798 | ||
799 | current->backing_dev_info = NULL; | |
800 | ||
801 | if (ret == -EIOCBQUEUED && !(ioflags & IO_ISAIO)) | |
802 | ret = wait_on_sync_kiocb(iocb); | |
803 | ||
eb9df39d CH |
804 | if (ret == -ENOSPC && |
805 | DM_EVENT_ENABLED(xip, DM_EVENT_NOSPACE) && !(ioflags & IO_INVIS)) { | |
993386c1 | 806 | xfs_rwunlock(xip, locktype); |
a13828b1 | 807 | if (need_i_mutex) |
1b1dcc1b | 808 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
809 | error = XFS_SEND_NAMESP(xip->i_mount, DM_EVENT_NOSPACE, vp, |
810 | DM_RIGHT_NULL, vp, DM_RIGHT_NULL, NULL, NULL, | |
811 | 0, 0, 0); /* Delay flag intentionally unused */ | |
a13828b1 | 812 | if (need_i_mutex) |
1b1dcc1b | 813 | mutex_lock(&inode->i_mutex); |
993386c1 | 814 | xfs_rwlock(xip, locktype); |
ba87ea69 LM |
815 | if (error) |
816 | goto out_unlock_internal; | |
817 | pos = xip->i_size; | |
1da177e4 LT |
818 | ret = 0; |
819 | goto retry; | |
820 | } | |
821 | ||
68bdb6ea YL |
822 | isize = i_size_read(inode); |
823 | if (unlikely(ret < 0 && ret != -EFAULT && *offset > isize)) | |
824 | *offset = isize; | |
825 | ||
ba87ea69 | 826 | if (*offset > xip->i_size) { |
1da177e4 | 827 | xfs_ilock(xip, XFS_ILOCK_EXCL); |
ba87ea69 LM |
828 | if (*offset > xip->i_size) |
829 | xip->i_size = *offset; | |
1da177e4 LT |
830 | xfs_iunlock(xip, XFS_ILOCK_EXCL); |
831 | } | |
832 | ||
833 | error = -ret; | |
834 | if (ret <= 0) | |
835 | goto out_unlock_internal; | |
836 | ||
837 | XFS_STATS_ADD(xs_write_bytes, ret); | |
838 | ||
839 | /* Handle various SYNC-type writes */ | |
840 | if ((file->f_flags & O_SYNC) || IS_SYNC(inode)) { | |
1e69dd0e NS |
841 | error = xfs_write_sync_logforce(mp, xip); |
842 | if (error) | |
843 | goto out_unlock_internal; | |
a13828b1 | 844 | |
993386c1 | 845 | xfs_rwunlock(xip, locktype); |
a13828b1 | 846 | if (need_i_mutex) |
1b1dcc1b | 847 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
848 | |
849 | error = sync_page_range(inode, mapping, pos, ret); | |
850 | if (!error) | |
ba87ea69 LM |
851 | error = -ret; |
852 | if (need_i_mutex) | |
853 | mutex_lock(&inode->i_mutex); | |
993386c1 | 854 | xfs_rwlock(xip, locktype); |
1da177e4 LT |
855 | } |
856 | ||
857 | out_unlock_internal: | |
ba87ea69 LM |
858 | if (io->io_new_size) { |
859 | xfs_ilock(xip, XFS_ILOCK_EXCL); | |
860 | io->io_new_size = 0; | |
861 | /* | |
862 | * If this was a direct or synchronous I/O that failed (such | |
863 | * as ENOSPC) then part of the I/O may have been written to | |
864 | * disk before the error occured. In this case the on-disk | |
865 | * file size may have been adjusted beyond the in-memory file | |
866 | * size and now needs to be truncated back. | |
867 | */ | |
868 | if (xip->i_d.di_size > xip->i_size) | |
869 | xip->i_d.di_size = xip->i_size; | |
870 | xfs_iunlock(xip, XFS_ILOCK_EXCL); | |
871 | } | |
993386c1 | 872 | xfs_rwunlock(xip, locktype); |
a13828b1 NS |
873 | out_unlock_mutex: |
874 | if (need_i_mutex) | |
1b1dcc1b | 875 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
876 | return -error; |
877 | } | |
878 | ||
879 | /* | |
880 | * All xfs metadata buffers except log state machine buffers | |
881 | * get this attached as their b_bdstrat callback function. | |
882 | * This is so that we can catch a buffer | |
883 | * after prematurely unpinning it to forcibly shutdown the filesystem. | |
884 | */ | |
885 | int | |
886 | xfs_bdstrat_cb(struct xfs_buf *bp) | |
887 | { | |
888 | xfs_mount_t *mp; | |
889 | ||
890 | mp = XFS_BUF_FSPRIVATE3(bp, xfs_mount_t *); | |
891 | if (!XFS_FORCED_SHUTDOWN(mp)) { | |
ce8e922c | 892 | xfs_buf_iorequest(bp); |
1da177e4 LT |
893 | return 0; |
894 | } else { | |
895 | xfs_buftrace("XFS__BDSTRAT IOERROR", bp); | |
896 | /* | |
897 | * Metadata write that didn't get logged but | |
898 | * written delayed anyway. These aren't associated | |
899 | * with a transaction, and can be ignored. | |
900 | */ | |
901 | if (XFS_BUF_IODONE_FUNC(bp) == NULL && | |
902 | (XFS_BUF_ISREAD(bp)) == 0) | |
903 | return (xfs_bioerror_relse(bp)); | |
904 | else | |
905 | return (xfs_bioerror(bp)); | |
906 | } | |
907 | } | |
908 | ||
909 | ||
910 | int | |
993386c1 CH |
911 | xfs_bmap( |
912 | xfs_inode_t *ip, | |
1da177e4 LT |
913 | xfs_off_t offset, |
914 | ssize_t count, | |
915 | int flags, | |
916 | xfs_iomap_t *iomapp, | |
917 | int *niomaps) | |
918 | { | |
1da177e4 LT |
919 | xfs_iocore_t *io = &ip->i_iocore; |
920 | ||
921 | ASSERT((ip->i_d.di_mode & S_IFMT) == S_IFREG); | |
922 | ASSERT(((ip->i_d.di_flags & XFS_DIFLAG_REALTIME) != 0) == | |
923 | ((ip->i_iocore.io_flags & XFS_IOCORE_RT) != 0)); | |
924 | ||
925 | return xfs_iomap(io, offset, count, flags, iomapp, niomaps); | |
926 | } | |
927 | ||
928 | /* | |
929 | * Wrapper around bdstrat so that we can stop data | |
930 | * from going to disk in case we are shutting down the filesystem. | |
931 | * Typically user data goes thru this path; one of the exceptions | |
932 | * is the superblock. | |
933 | */ | |
934 | int | |
935 | xfsbdstrat( | |
936 | struct xfs_mount *mp, | |
937 | struct xfs_buf *bp) | |
938 | { | |
939 | ASSERT(mp); | |
940 | if (!XFS_FORCED_SHUTDOWN(mp)) { | |
941 | /* Grio redirection would go here | |
942 | * if (XFS_BUF_IS_GRIO(bp)) { | |
943 | */ | |
944 | ||
ce8e922c | 945 | xfs_buf_iorequest(bp); |
1da177e4 LT |
946 | return 0; |
947 | } | |
948 | ||
949 | xfs_buftrace("XFSBDSTRAT IOERROR", bp); | |
950 | return (xfs_bioerror_relse(bp)); | |
951 | } | |
952 | ||
953 | /* | |
954 | * If the underlying (data/log/rt) device is readonly, there are some | |
955 | * operations that cannot proceed. | |
956 | */ | |
957 | int | |
958 | xfs_dev_is_read_only( | |
959 | xfs_mount_t *mp, | |
960 | char *message) | |
961 | { | |
962 | if (xfs_readonly_buftarg(mp->m_ddev_targp) || | |
963 | xfs_readonly_buftarg(mp->m_logdev_targp) || | |
964 | (mp->m_rtdev_targp && xfs_readonly_buftarg(mp->m_rtdev_targp))) { | |
965 | cmn_err(CE_NOTE, | |
966 | "XFS: %s required on read-only device.", message); | |
967 | cmn_err(CE_NOTE, | |
968 | "XFS: write access unavailable, cannot proceed."); | |
969 | return EROFS; | |
970 | } | |
971 | return 0; | |
972 | } |