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" | |
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" | |
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, | |
60 | xfs_iocore_t *io, | |
61 | void *data, | |
62 | size_t segs, | |
63 | loff_t offset, | |
64 | int ioflags) | |
65 | { | |
66 | xfs_inode_t *ip = XFS_IO_INODE(io); | |
67 | ||
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), | |
80 | (void *)((unsigned long)((io->io_new_size >> 32) & 0xffffffff)), | |
81 | (void *)((unsigned long)(io->io_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( | |
91 | xfs_iocore_t *io, | |
92 | xfs_off_t offset, | |
93 | xfs_off_t len, | |
94 | xfs_off_t first, | |
95 | xfs_off_t last) | |
96 | { | |
97 | xfs_inode_t *ip = XFS_IO_INODE(io); | |
98 | ||
99 | if (ip->i_rwtrace == NULL) | |
100 | return; | |
101 | ktrace_enter(ip->i_rwtrace, | |
102 | (void *)(__psint_t)XFS_INVAL_CACHED, | |
103 | (void *)ip, | |
104 | (void *)((unsigned long)((offset >> 32) & 0xffffffff)), | |
105 | (void *)((unsigned long)(offset & 0xffffffff)), | |
106 | (void *)((unsigned long)((len >> 32) & 0xffffffff)), | |
107 | (void *)((unsigned long)(len & 0xffffffff)), | |
108 | (void *)((unsigned long)((first >> 32) & 0xffffffff)), | |
109 | (void *)((unsigned long)(first & 0xffffffff)), | |
110 | (void *)((unsigned long)((last >> 32) & 0xffffffff)), | |
111 | (void *)((unsigned long)(last & 0xffffffff)), | |
f1fdc848 | 112 | (void *)((unsigned long)current_pid()), |
1da177e4 LT |
113 | (void *)NULL, |
114 | (void *)NULL, | |
115 | (void *)NULL, | |
116 | (void *)NULL, | |
117 | (void *)NULL); | |
118 | } | |
119 | #endif | |
120 | ||
121 | /* | |
122 | * xfs_iozero | |
123 | * | |
124 | * xfs_iozero clears the specified range of buffer supplied, | |
125 | * and marks all the affected blocks as valid and modified. If | |
126 | * an affected block is not allocated, it will be allocated. If | |
127 | * an affected block is not completely overwritten, and is not | |
128 | * valid before the operation, it will be read from disk before | |
129 | * being partially zeroed. | |
130 | */ | |
131 | STATIC int | |
132 | xfs_iozero( | |
133 | struct inode *ip, /* inode */ | |
134 | loff_t pos, /* offset in file */ | |
68160161 | 135 | size_t count) /* size of data to zero */ |
1da177e4 LT |
136 | { |
137 | unsigned bytes; | |
138 | struct page *page; | |
139 | struct address_space *mapping; | |
1da177e4 LT |
140 | int status; |
141 | ||
142 | mapping = ip->i_mapping; | |
143 | do { | |
144 | unsigned long index, offset; | |
145 | ||
146 | offset = (pos & (PAGE_CACHE_SIZE -1)); /* Within page */ | |
147 | index = pos >> PAGE_CACHE_SHIFT; | |
148 | bytes = PAGE_CACHE_SIZE - offset; | |
149 | if (bytes > count) | |
150 | bytes = count; | |
151 | ||
152 | status = -ENOMEM; | |
153 | page = grab_cache_page(mapping, index); | |
154 | if (!page) | |
155 | break; | |
156 | ||
1da177e4 LT |
157 | status = mapping->a_ops->prepare_write(NULL, page, offset, |
158 | offset + bytes); | |
e7ff6aed | 159 | if (status) |
1da177e4 | 160 | goto unlock; |
1da177e4 | 161 | |
e7ff6aed DC |
162 | memclear_highpage_flush(page, offset, bytes); |
163 | ||
1da177e4 LT |
164 | status = mapping->a_ops->commit_write(NULL, page, offset, |
165 | offset + bytes); | |
166 | if (!status) { | |
167 | pos += bytes; | |
168 | count -= bytes; | |
1da177e4 LT |
169 | } |
170 | ||
171 | unlock: | |
1da177e4 LT |
172 | unlock_page(page); |
173 | page_cache_release(page); | |
174 | if (status) | |
175 | break; | |
176 | } while (count); | |
177 | ||
178 | return (-status); | |
179 | } | |
180 | ||
1da177e4 LT |
181 | ssize_t /* bytes read, or (-) error */ |
182 | xfs_read( | |
183 | bhv_desc_t *bdp, | |
184 | struct kiocb *iocb, | |
185 | const struct iovec *iovp, | |
186 | unsigned int segs, | |
187 | loff_t *offset, | |
188 | int ioflags, | |
189 | cred_t *credp) | |
190 | { | |
191 | struct file *file = iocb->ki_filp; | |
192 | struct inode *inode = file->f_mapping->host; | |
193 | size_t size = 0; | |
d3cf2094 | 194 | ssize_t ret = 0; |
1da177e4 LT |
195 | xfs_fsize_t n; |
196 | xfs_inode_t *ip; | |
197 | xfs_mount_t *mp; | |
67fcaa73 | 198 | bhv_vnode_t *vp; |
1da177e4 LT |
199 | unsigned long seg; |
200 | ||
201 | ip = XFS_BHVTOI(bdp); | |
202 | vp = BHV_TO_VNODE(bdp); | |
203 | mp = ip->i_mount; | |
204 | ||
205 | XFS_STATS_INC(xs_read_calls); | |
206 | ||
207 | /* START copy & waste from filemap.c */ | |
208 | for (seg = 0; seg < segs; seg++) { | |
209 | const struct iovec *iv = &iovp[seg]; | |
210 | ||
211 | /* | |
212 | * If any segment has a negative length, or the cumulative | |
213 | * length ever wraps negative then return -EINVAL. | |
214 | */ | |
215 | size += iv->iov_len; | |
216 | if (unlikely((ssize_t)(size|iv->iov_len) < 0)) | |
217 | return XFS_ERROR(-EINVAL); | |
218 | } | |
219 | /* END copy & waste from filemap.c */ | |
220 | ||
221 | if (unlikely(ioflags & IO_ISDIRECT)) { | |
222 | xfs_buftarg_t *target = | |
223 | (ip->i_d.di_flags & XFS_DIFLAG_REALTIME) ? | |
224 | mp->m_rtdev_targp : mp->m_ddev_targp; | |
ce8e922c NS |
225 | if ((*offset & target->bt_smask) || |
226 | (size & target->bt_smask)) { | |
1da177e4 LT |
227 | if (*offset == ip->i_d.di_size) { |
228 | return (0); | |
229 | } | |
230 | return -XFS_ERROR(EINVAL); | |
231 | } | |
232 | } | |
233 | ||
234 | n = XFS_MAXIOFFSET(mp) - *offset; | |
235 | if ((n <= 0) || (size == 0)) | |
236 | return 0; | |
237 | ||
238 | if (n < size) | |
239 | size = n; | |
240 | ||
a13828b1 | 241 | if (XFS_FORCED_SHUTDOWN(mp)) |
1da177e4 | 242 | return -EIO; |
1da177e4 LT |
243 | |
244 | if (unlikely(ioflags & IO_ISDIRECT)) | |
1b1dcc1b | 245 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
246 | xfs_ilock(ip, XFS_IOLOCK_SHARED); |
247 | ||
248 | if (DM_EVENT_ENABLED(vp->v_vfsp, ip, DM_EVENT_READ) && | |
249 | !(ioflags & IO_INVIS)) { | |
8285fb58 | 250 | bhv_vrwlock_t locktype = VRWLOCK_READ; |
e1a40fa9 | 251 | int dmflags = FILP_DELAY_FLAG(file) | DM_SEM_FLAG_RD(ioflags); |
1da177e4 LT |
252 | |
253 | ret = -XFS_SEND_DATA(mp, DM_EVENT_READ, | |
254 | BHV_TO_VNODE(bdp), *offset, size, | |
e1a40fa9 | 255 | dmflags, &locktype); |
1da177e4 LT |
256 | if (ret) { |
257 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); | |
721259bc LM |
258 | if (unlikely(ioflags & IO_ISDIRECT)) |
259 | mutex_unlock(&inode->i_mutex); | |
260 | return ret; | |
1da177e4 LT |
261 | } |
262 | } | |
263 | ||
edcd4bce NS |
264 | if (unlikely(ioflags & IO_ISDIRECT)) { |
265 | if (VN_CACHED(vp)) | |
d3cf2094 | 266 | ret = bhv_vop_flushinval_pages(vp, ctooff(offtoct(*offset)), |
edcd4bce | 267 | -1, FI_REMAPF_LOCKED); |
721259bc | 268 | mutex_unlock(&inode->i_mutex); |
d3cf2094 LM |
269 | if (ret) { |
270 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); | |
271 | return ret; | |
272 | } | |
edcd4bce | 273 | } |
721259bc | 274 | |
1da177e4 LT |
275 | xfs_rw_enter_trace(XFS_READ_ENTER, &ip->i_iocore, |
276 | (void *)iovp, segs, *offset, ioflags); | |
543ade1f BP |
277 | |
278 | iocb->ki_pos = *offset; | |
279 | ret = generic_file_aio_read(iocb, iovp, segs, *offset); | |
1da177e4 LT |
280 | if (ret == -EIOCBQUEUED && !(ioflags & IO_ISAIO)) |
281 | ret = wait_on_sync_kiocb(iocb); | |
282 | if (ret > 0) | |
283 | XFS_STATS_ADD(xs_read_bytes, ret); | |
284 | ||
285 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); | |
1da177e4 LT |
286 | return ret; |
287 | } | |
288 | ||
289 | ssize_t | |
290 | xfs_sendfile( | |
291 | bhv_desc_t *bdp, | |
292 | struct file *filp, | |
293 | loff_t *offset, | |
294 | int ioflags, | |
295 | size_t count, | |
296 | read_actor_t actor, | |
297 | void *target, | |
298 | cred_t *credp) | |
299 | { | |
1b895840 NS |
300 | xfs_inode_t *ip = XFS_BHVTOI(bdp); |
301 | xfs_mount_t *mp = ip->i_mount; | |
1da177e4 | 302 | ssize_t ret; |
1da177e4 LT |
303 | |
304 | XFS_STATS_INC(xs_read_calls); | |
1b895840 | 305 | if (XFS_FORCED_SHUTDOWN(mp)) |
1da177e4 LT |
306 | return -EIO; |
307 | ||
308 | xfs_ilock(ip, XFS_IOLOCK_SHARED); | |
309 | ||
1b895840 | 310 | if (DM_EVENT_ENABLED(BHV_TO_VNODE(bdp)->v_vfsp, ip, DM_EVENT_READ) && |
1da177e4 | 311 | (!(ioflags & IO_INVIS))) { |
8285fb58 | 312 | bhv_vrwlock_t locktype = VRWLOCK_READ; |
1da177e4 LT |
313 | int error; |
314 | ||
1b895840 NS |
315 | error = XFS_SEND_DATA(mp, DM_EVENT_READ, BHV_TO_VNODE(bdp), |
316 | *offset, count, | |
1da177e4 LT |
317 | FILP_DELAY_FLAG(filp), &locktype); |
318 | if (error) { | |
319 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); | |
320 | return -error; | |
321 | } | |
322 | } | |
323 | xfs_rw_enter_trace(XFS_SENDFILE_ENTER, &ip->i_iocore, | |
324 | (void *)(unsigned long)target, count, *offset, ioflags); | |
325 | ret = generic_file_sendfile(filp, offset, count, actor, target); | |
1b895840 NS |
326 | if (ret > 0) |
327 | XFS_STATS_ADD(xs_read_bytes, ret); | |
1da177e4 LT |
328 | |
329 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); | |
1b895840 NS |
330 | return ret; |
331 | } | |
332 | ||
333 | ssize_t | |
334 | xfs_splice_read( | |
335 | bhv_desc_t *bdp, | |
336 | struct file *infilp, | |
cbb7e577 | 337 | loff_t *ppos, |
3a326a2c | 338 | struct pipe_inode_info *pipe, |
1b895840 NS |
339 | size_t count, |
340 | int flags, | |
341 | int ioflags, | |
342 | cred_t *credp) | |
343 | { | |
344 | xfs_inode_t *ip = XFS_BHVTOI(bdp); | |
345 | xfs_mount_t *mp = ip->i_mount; | |
346 | ssize_t ret; | |
1da177e4 | 347 | |
1b895840 NS |
348 | XFS_STATS_INC(xs_read_calls); |
349 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) | |
350 | return -EIO; | |
351 | ||
352 | xfs_ilock(ip, XFS_IOLOCK_SHARED); | |
353 | ||
354 | if (DM_EVENT_ENABLED(BHV_TO_VNODE(bdp)->v_vfsp, ip, DM_EVENT_READ) && | |
355 | (!(ioflags & IO_INVIS))) { | |
8285fb58 | 356 | bhv_vrwlock_t locktype = VRWLOCK_READ; |
1b895840 NS |
357 | int error; |
358 | ||
359 | error = XFS_SEND_DATA(mp, DM_EVENT_READ, BHV_TO_VNODE(bdp), | |
cbb7e577 | 360 | *ppos, count, |
1b895840 NS |
361 | FILP_DELAY_FLAG(infilp), &locktype); |
362 | if (error) { | |
363 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); | |
364 | return -error; | |
365 | } | |
366 | } | |
367 | xfs_rw_enter_trace(XFS_SPLICE_READ_ENTER, &ip->i_iocore, | |
cbb7e577 JA |
368 | pipe, count, *ppos, ioflags); |
369 | ret = generic_file_splice_read(infilp, ppos, pipe, count, flags); | |
1da177e4 LT |
370 | if (ret > 0) |
371 | XFS_STATS_ADD(xs_read_bytes, ret); | |
372 | ||
1b895840 NS |
373 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); |
374 | return ret; | |
375 | } | |
376 | ||
377 | ssize_t | |
378 | xfs_splice_write( | |
379 | bhv_desc_t *bdp, | |
3a326a2c | 380 | struct pipe_inode_info *pipe, |
1b895840 | 381 | struct file *outfilp, |
cbb7e577 | 382 | loff_t *ppos, |
1b895840 NS |
383 | size_t count, |
384 | int flags, | |
385 | int ioflags, | |
386 | cred_t *credp) | |
387 | { | |
388 | xfs_inode_t *ip = XFS_BHVTOI(bdp); | |
389 | xfs_mount_t *mp = ip->i_mount; | |
390 | ssize_t ret; | |
0a8d17d0 DC |
391 | struct inode *inode = outfilp->f_mapping->host; |
392 | xfs_fsize_t isize; | |
1b895840 NS |
393 | |
394 | XFS_STATS_INC(xs_write_calls); | |
395 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) | |
396 | return -EIO; | |
397 | ||
398 | xfs_ilock(ip, XFS_IOLOCK_EXCL); | |
399 | ||
400 | if (DM_EVENT_ENABLED(BHV_TO_VNODE(bdp)->v_vfsp, ip, DM_EVENT_WRITE) && | |
401 | (!(ioflags & IO_INVIS))) { | |
8285fb58 | 402 | bhv_vrwlock_t locktype = VRWLOCK_WRITE; |
1b895840 NS |
403 | int error; |
404 | ||
405 | error = XFS_SEND_DATA(mp, DM_EVENT_WRITE, BHV_TO_VNODE(bdp), | |
cbb7e577 | 406 | *ppos, count, |
1b895840 NS |
407 | FILP_DELAY_FLAG(outfilp), &locktype); |
408 | if (error) { | |
409 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); | |
410 | return -error; | |
411 | } | |
412 | } | |
413 | xfs_rw_enter_trace(XFS_SPLICE_WRITE_ENTER, &ip->i_iocore, | |
cbb7e577 JA |
414 | pipe, count, *ppos, ioflags); |
415 | ret = generic_file_splice_write(pipe, outfilp, ppos, count, flags); | |
1b895840 NS |
416 | if (ret > 0) |
417 | XFS_STATS_ADD(xs_write_bytes, ret); | |
418 | ||
0a8d17d0 DC |
419 | isize = i_size_read(inode); |
420 | if (unlikely(ret < 0 && ret != -EFAULT && *ppos > isize)) | |
421 | *ppos = isize; | |
422 | ||
423 | if (*ppos > ip->i_d.di_size) { | |
424 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
425 | if (*ppos > ip->i_d.di_size) { | |
426 | ip->i_d.di_size = *ppos; | |
427 | i_size_write(inode, *ppos); | |
428 | ip->i_update_core = 1; | |
429 | ip->i_update_size = 1; | |
430 | } | |
431 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
432 | } | |
1b895840 | 433 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); |
1da177e4 LT |
434 | return ret; |
435 | } | |
436 | ||
437 | /* | |
438 | * This routine is called to handle zeroing any space in the last | |
439 | * block of the file that is beyond the EOF. We do this since the | |
440 | * size is being increased without writing anything to that block | |
441 | * and we don't want anyone to read the garbage on the disk. | |
442 | */ | |
443 | STATIC int /* error (positive) */ | |
444 | xfs_zero_last_block( | |
445 | struct inode *ip, | |
446 | xfs_iocore_t *io, | |
68160161 LM |
447 | xfs_fsize_t offset, |
448 | xfs_fsize_t isize) | |
1da177e4 LT |
449 | { |
450 | xfs_fileoff_t last_fsb; | |
1b895840 | 451 | xfs_mount_t *mp = io->io_mount; |
1da177e4 LT |
452 | int nimaps; |
453 | int zero_offset; | |
454 | int zero_len; | |
1da177e4 LT |
455 | int error = 0; |
456 | xfs_bmbt_irec_t imap; | |
1da177e4 LT |
457 | |
458 | ASSERT(ismrlocked(io->io_lock, MR_UPDATE) != 0); | |
1da177e4 | 459 | |
24ee8088 ES |
460 | zero_offset = XFS_B_FSB_OFFSET(mp, isize); |
461 | if (zero_offset == 0) { | |
1da177e4 LT |
462 | /* |
463 | * There are no extra bytes in the last block on disk to | |
464 | * zero, so return. | |
465 | */ | |
466 | return 0; | |
467 | } | |
468 | ||
469 | last_fsb = XFS_B_TO_FSBT(mp, isize); | |
470 | nimaps = 1; | |
471 | error = XFS_BMAPI(mp, NULL, io, last_fsb, 1, 0, NULL, 0, &imap, | |
3e57ecf6 | 472 | &nimaps, NULL, NULL); |
1da177e4 LT |
473 | if (error) { |
474 | return error; | |
475 | } | |
476 | ASSERT(nimaps > 0); | |
477 | /* | |
478 | * If the block underlying isize is just a hole, then there | |
479 | * is nothing to zero. | |
480 | */ | |
481 | if (imap.br_startblock == HOLESTARTBLOCK) { | |
482 | return 0; | |
483 | } | |
484 | /* | |
485 | * Zero the part of the last block beyond the EOF, and write it | |
486 | * out sync. We need to drop the ilock while we do this so we | |
487 | * don't deadlock when the buffer cache calls back to us. | |
488 | */ | |
489 | XFS_IUNLOCK(mp, io, XFS_ILOCK_EXCL| XFS_EXTSIZE_RD); | |
1da177e4 | 490 | |
24ee8088 | 491 | zero_len = mp->m_sb.sb_blocksize - zero_offset; |
68160161 LM |
492 | if (isize + zero_len > offset) |
493 | zero_len = offset - isize; | |
494 | error = xfs_iozero(ip, isize, zero_len); | |
1da177e4 LT |
495 | |
496 | XFS_ILOCK(mp, io, XFS_ILOCK_EXCL|XFS_EXTSIZE_RD); | |
497 | ASSERT(error >= 0); | |
498 | return error; | |
499 | } | |
500 | ||
501 | /* | |
502 | * Zero any on disk space between the current EOF and the new, | |
503 | * larger EOF. This handles the normal case of zeroing the remainder | |
504 | * of the last block in the file and the unusual case of zeroing blocks | |
505 | * out beyond the size of the file. This second case only happens | |
506 | * with fixed size extents and when the system crashes before the inode | |
507 | * size was updated but after blocks were allocated. If fill is set, | |
508 | * then any holes in the range are filled and zeroed. If not, the holes | |
509 | * are left alone as holes. | |
510 | */ | |
511 | ||
512 | int /* error (positive) */ | |
513 | xfs_zero_eof( | |
67fcaa73 | 514 | bhv_vnode_t *vp, |
1da177e4 LT |
515 | xfs_iocore_t *io, |
516 | xfs_off_t offset, /* starting I/O offset */ | |
68160161 | 517 | xfs_fsize_t isize) /* current inode size */ |
1da177e4 | 518 | { |
ec86dc02 | 519 | struct inode *ip = vn_to_inode(vp); |
1da177e4 LT |
520 | xfs_fileoff_t start_zero_fsb; |
521 | xfs_fileoff_t end_zero_fsb; | |
1da177e4 LT |
522 | xfs_fileoff_t zero_count_fsb; |
523 | xfs_fileoff_t last_fsb; | |
68160161 LM |
524 | xfs_fileoff_t zero_off; |
525 | xfs_fsize_t zero_len; | |
1b895840 | 526 | xfs_mount_t *mp = io->io_mount; |
1da177e4 LT |
527 | int nimaps; |
528 | int error = 0; | |
529 | xfs_bmbt_irec_t imap; | |
1da177e4 LT |
530 | |
531 | ASSERT(ismrlocked(io->io_lock, MR_UPDATE)); | |
532 | ASSERT(ismrlocked(io->io_iolock, MR_UPDATE)); | |
24ee8088 | 533 | ASSERT(offset > isize); |
1da177e4 | 534 | |
1da177e4 LT |
535 | /* |
536 | * First handle zeroing the block on which isize resides. | |
537 | * We only zero a part of that block so it is handled specially. | |
538 | */ | |
68160161 | 539 | error = xfs_zero_last_block(ip, io, offset, isize); |
1da177e4 LT |
540 | if (error) { |
541 | ASSERT(ismrlocked(io->io_lock, MR_UPDATE)); | |
542 | ASSERT(ismrlocked(io->io_iolock, MR_UPDATE)); | |
543 | return error; | |
544 | } | |
545 | ||
546 | /* | |
547 | * Calculate the range between the new size and the old | |
548 | * where blocks needing to be zeroed may exist. To get the | |
549 | * block where the last byte in the file currently resides, | |
550 | * we need to subtract one from the size and truncate back | |
551 | * to a block boundary. We subtract 1 in case the size is | |
552 | * exactly on a block boundary. | |
553 | */ | |
554 | last_fsb = isize ? XFS_B_TO_FSBT(mp, isize - 1) : (xfs_fileoff_t)-1; | |
555 | start_zero_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)isize); | |
556 | end_zero_fsb = XFS_B_TO_FSBT(mp, offset - 1); | |
557 | ASSERT((xfs_sfiloff_t)last_fsb < (xfs_sfiloff_t)start_zero_fsb); | |
558 | if (last_fsb == end_zero_fsb) { | |
559 | /* | |
560 | * The size was only incremented on its last block. | |
561 | * We took care of that above, so just return. | |
562 | */ | |
563 | return 0; | |
564 | } | |
565 | ||
566 | ASSERT(start_zero_fsb <= end_zero_fsb); | |
1da177e4 LT |
567 | while (start_zero_fsb <= end_zero_fsb) { |
568 | nimaps = 1; | |
569 | zero_count_fsb = end_zero_fsb - start_zero_fsb + 1; | |
570 | error = XFS_BMAPI(mp, NULL, io, start_zero_fsb, zero_count_fsb, | |
3e57ecf6 | 571 | 0, NULL, 0, &imap, &nimaps, NULL, NULL); |
1da177e4 LT |
572 | if (error) { |
573 | ASSERT(ismrlocked(io->io_lock, MR_UPDATE)); | |
574 | ASSERT(ismrlocked(io->io_iolock, MR_UPDATE)); | |
575 | return error; | |
576 | } | |
577 | ASSERT(nimaps > 0); | |
578 | ||
579 | if (imap.br_state == XFS_EXT_UNWRITTEN || | |
580 | imap.br_startblock == HOLESTARTBLOCK) { | |
581 | /* | |
582 | * This loop handles initializing pages that were | |
583 | * partially initialized by the code below this | |
584 | * loop. It basically zeroes the part of the page | |
585 | * that sits on a hole and sets the page as P_HOLE | |
586 | * and calls remapf if it is a mapped file. | |
587 | */ | |
24ee8088 | 588 | start_zero_fsb = imap.br_startoff + imap.br_blockcount; |
1da177e4 LT |
589 | ASSERT(start_zero_fsb <= (end_zero_fsb + 1)); |
590 | continue; | |
591 | } | |
592 | ||
593 | /* | |
3d80ede4 | 594 | * There are blocks we need to zero. |
1da177e4 LT |
595 | * Drop the inode lock while we're doing the I/O. |
596 | * We'll still have the iolock to protect us. | |
597 | */ | |
598 | XFS_IUNLOCK(mp, io, XFS_ILOCK_EXCL|XFS_EXTSIZE_RD); | |
599 | ||
68160161 LM |
600 | zero_off = XFS_FSB_TO_B(mp, start_zero_fsb); |
601 | zero_len = XFS_FSB_TO_B(mp, imap.br_blockcount); | |
602 | ||
603 | if ((zero_off + zero_len) > offset) | |
604 | zero_len = offset - zero_off; | |
605 | ||
606 | error = xfs_iozero(ip, zero_off, zero_len); | |
1da177e4 LT |
607 | if (error) { |
608 | goto out_lock; | |
609 | } | |
610 | ||
3d80ede4 | 611 | start_zero_fsb = imap.br_startoff + imap.br_blockcount; |
1da177e4 LT |
612 | ASSERT(start_zero_fsb <= (end_zero_fsb + 1)); |
613 | ||
614 | XFS_ILOCK(mp, io, XFS_ILOCK_EXCL|XFS_EXTSIZE_RD); | |
615 | } | |
616 | ||
617 | return 0; | |
618 | ||
619 | out_lock: | |
620 | ||
621 | XFS_ILOCK(mp, io, XFS_ILOCK_EXCL|XFS_EXTSIZE_RD); | |
622 | ASSERT(error >= 0); | |
623 | return error; | |
624 | } | |
625 | ||
626 | ssize_t /* bytes written, or (-) error */ | |
627 | xfs_write( | |
628 | bhv_desc_t *bdp, | |
629 | struct kiocb *iocb, | |
630 | const struct iovec *iovp, | |
631 | unsigned int nsegs, | |
632 | loff_t *offset, | |
633 | int ioflags, | |
634 | cred_t *credp) | |
635 | { | |
636 | struct file *file = iocb->ki_filp; | |
637 | struct address_space *mapping = file->f_mapping; | |
638 | struct inode *inode = mapping->host; | |
639 | unsigned long segs = nsegs; | |
640 | xfs_inode_t *xip; | |
641 | xfs_mount_t *mp; | |
642 | ssize_t ret = 0, error = 0; | |
643 | xfs_fsize_t isize, new_size; | |
644 | xfs_iocore_t *io; | |
67fcaa73 | 645 | bhv_vnode_t *vp; |
1da177e4 LT |
646 | unsigned long seg; |
647 | int iolock; | |
648 | int eventsent = 0; | |
8285fb58 | 649 | bhv_vrwlock_t locktype; |
1da177e4 LT |
650 | size_t ocount = 0, count; |
651 | loff_t pos; | |
2a329631 | 652 | int need_i_mutex; |
1da177e4 LT |
653 | |
654 | XFS_STATS_INC(xs_write_calls); | |
655 | ||
656 | vp = BHV_TO_VNODE(bdp); | |
657 | xip = XFS_BHVTOI(bdp); | |
658 | ||
659 | for (seg = 0; seg < segs; seg++) { | |
660 | const struct iovec *iv = &iovp[seg]; | |
661 | ||
662 | /* | |
663 | * If any segment has a negative length, or the cumulative | |
664 | * length ever wraps negative then return -EINVAL. | |
665 | */ | |
666 | ocount += iv->iov_len; | |
667 | if (unlikely((ssize_t)(ocount|iv->iov_len) < 0)) | |
668 | return -EINVAL; | |
669 | if (access_ok(VERIFY_READ, iv->iov_base, iv->iov_len)) | |
670 | continue; | |
671 | if (seg == 0) | |
672 | return -EFAULT; | |
673 | segs = seg; | |
674 | ocount -= iv->iov_len; /* This segment is no good */ | |
675 | break; | |
676 | } | |
677 | ||
678 | count = ocount; | |
679 | pos = *offset; | |
680 | ||
681 | if (count == 0) | |
682 | return 0; | |
683 | ||
684 | io = &xip->i_iocore; | |
685 | mp = io->io_mount; | |
686 | ||
34327e13 NS |
687 | vfs_wait_for_freeze(vp->v_vfsp, SB_FREEZE_WRITE); |
688 | ||
1da177e4 LT |
689 | if (XFS_FORCED_SHUTDOWN(mp)) |
690 | return -EIO; | |
691 | ||
1da177e4 | 692 | relock: |
2a329631 LM |
693 | if (ioflags & IO_ISDIRECT) { |
694 | iolock = XFS_IOLOCK_SHARED; | |
695 | locktype = VRWLOCK_WRITE_DIRECT; | |
696 | need_i_mutex = 0; | |
697 | } else { | |
1da177e4 LT |
698 | iolock = XFS_IOLOCK_EXCL; |
699 | locktype = VRWLOCK_WRITE; | |
2a329631 | 700 | need_i_mutex = 1; |
1b1dcc1b | 701 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
702 | } |
703 | ||
704 | xfs_ilock(xip, XFS_ILOCK_EXCL|iolock); | |
705 | ||
1da177e4 LT |
706 | start: |
707 | error = -generic_write_checks(file, &pos, &count, | |
708 | S_ISBLK(inode->i_mode)); | |
709 | if (error) { | |
710 | xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock); | |
a13828b1 | 711 | goto out_unlock_mutex; |
1da177e4 LT |
712 | } |
713 | ||
2a329631 LM |
714 | isize = i_size_read(inode); |
715 | ||
716 | if (ioflags & IO_ISDIRECT) { | |
717 | xfs_buftarg_t *target = | |
718 | (xip->i_d.di_flags & XFS_DIFLAG_REALTIME) ? | |
719 | mp->m_rtdev_targp : mp->m_ddev_targp; | |
720 | ||
721 | if ((pos & target->bt_smask) || (count & target->bt_smask)) { | |
722 | xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock); | |
723 | return XFS_ERROR(-EINVAL); | |
724 | } | |
725 | ||
726 | if (!need_i_mutex && (VN_CACHED(vp) || pos > isize)) { | |
727 | xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock); | |
728 | iolock = XFS_IOLOCK_EXCL; | |
729 | locktype = VRWLOCK_WRITE; | |
730 | need_i_mutex = 1; | |
731 | mutex_lock(&inode->i_mutex); | |
732 | xfs_ilock(xip, XFS_ILOCK_EXCL|iolock); | |
733 | goto start; | |
734 | } | |
735 | } | |
736 | ||
1da177e4 LT |
737 | new_size = pos + count; |
738 | if (new_size > isize) | |
739 | io->io_new_size = new_size; | |
740 | ||
741 | if ((DM_EVENT_ENABLED(vp->v_vfsp, xip, DM_EVENT_WRITE) && | |
742 | !(ioflags & IO_INVIS) && !eventsent)) { | |
743 | loff_t savedsize = pos; | |
744 | int dmflags = FILP_DELAY_FLAG(file); | |
745 | ||
a13828b1 | 746 | if (need_i_mutex) |
1b1dcc1b | 747 | dmflags |= DM_FLAGS_IMUX; |
1da177e4 LT |
748 | |
749 | xfs_iunlock(xip, XFS_ILOCK_EXCL); | |
750 | error = XFS_SEND_DATA(xip->i_mount, DM_EVENT_WRITE, vp, | |
751 | pos, count, | |
752 | dmflags, &locktype); | |
753 | if (error) { | |
754 | xfs_iunlock(xip, iolock); | |
a13828b1 | 755 | goto out_unlock_mutex; |
1da177e4 LT |
756 | } |
757 | xfs_ilock(xip, XFS_ILOCK_EXCL); | |
758 | eventsent = 1; | |
759 | ||
760 | /* | |
c41564b5 | 761 | * The iolock was dropped and reacquired in XFS_SEND_DATA |
1da177e4 LT |
762 | * so we have to recheck the size when appending. |
763 | * We will only "goto start;" once, since having sent the | |
764 | * event prevents another call to XFS_SEND_DATA, which is | |
765 | * what allows the size to change in the first place. | |
766 | */ | |
767 | if ((file->f_flags & O_APPEND) && savedsize != isize) { | |
1da177e4 LT |
768 | goto start; |
769 | } | |
770 | } | |
771 | ||
4aeb664c | 772 | if (likely(!(ioflags & IO_INVIS))) { |
870f4817 | 773 | file_update_time(file); |
4aeb664c NS |
774 | xfs_ichgtime_fast(xip, inode, |
775 | XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); | |
1da177e4 LT |
776 | } |
777 | ||
778 | /* | |
779 | * If the offset is beyond the size of the file, we have a couple | |
780 | * of things to do. First, if there is already space allocated | |
781 | * we need to either create holes or zero the disk or ... | |
782 | * | |
783 | * If there is a page where the previous size lands, we need | |
784 | * to zero it out up to the new size. | |
785 | */ | |
786 | ||
787 | if (pos > isize) { | |
68160161 | 788 | error = xfs_zero_eof(BHV_TO_VNODE(bdp), io, pos, isize); |
1da177e4 LT |
789 | if (error) { |
790 | xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock); | |
a13828b1 | 791 | goto out_unlock_mutex; |
1da177e4 LT |
792 | } |
793 | } | |
794 | xfs_iunlock(xip, XFS_ILOCK_EXCL); | |
795 | ||
796 | /* | |
797 | * If we're writing the file then make sure to clear the | |
798 | * setuid and setgid bits if the process is not being run | |
799 | * by root. This keeps people from modifying setuid and | |
800 | * setgid binaries. | |
801 | */ | |
802 | ||
803 | if (((xip->i_d.di_mode & S_ISUID) || | |
804 | ((xip->i_d.di_mode & (S_ISGID | S_IXGRP)) == | |
805 | (S_ISGID | S_IXGRP))) && | |
806 | !capable(CAP_FSETID)) { | |
807 | error = xfs_write_clear_setuid(xip); | |
808 | if (likely(!error)) | |
e678fb0d | 809 | error = -remove_suid(file->f_path.dentry); |
1da177e4 LT |
810 | if (unlikely(error)) { |
811 | xfs_iunlock(xip, iolock); | |
a13828b1 | 812 | goto out_unlock_mutex; |
1da177e4 LT |
813 | } |
814 | } | |
815 | ||
816 | retry: | |
817 | /* We can write back this queue in page reclaim */ | |
818 | current->backing_dev_info = mapping->backing_dev_info; | |
819 | ||
820 | if ((ioflags & IO_ISDIRECT)) { | |
2a329631 LM |
821 | if (VN_CACHED(vp)) { |
822 | WARN_ON(need_i_mutex == 0); | |
1da177e4 LT |
823 | xfs_inval_cached_trace(io, pos, -1, |
824 | ctooff(offtoct(pos)), -1); | |
d3cf2094 | 825 | error = bhv_vop_flushinval_pages(vp, ctooff(offtoct(pos)), |
1da177e4 | 826 | -1, FI_REMAPF_LOCKED); |
d3cf2094 LM |
827 | if (error) |
828 | goto out_unlock_internal; | |
1da177e4 LT |
829 | } |
830 | ||
a13828b1 | 831 | if (need_i_mutex) { |
1da177e4 LT |
832 | /* demote the lock now the cached pages are gone */ |
833 | XFS_ILOCK_DEMOTE(mp, io, XFS_IOLOCK_EXCL); | |
1b1dcc1b | 834 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
835 | |
836 | iolock = XFS_IOLOCK_SHARED; | |
837 | locktype = VRWLOCK_WRITE_DIRECT; | |
a13828b1 | 838 | need_i_mutex = 0; |
1da177e4 LT |
839 | } |
840 | ||
841 | xfs_rw_enter_trace(XFS_DIOWR_ENTER, io, (void *)iovp, segs, | |
842 | *offset, ioflags); | |
843 | ret = generic_file_direct_write(iocb, iovp, | |
844 | &segs, pos, offset, count, ocount); | |
845 | ||
846 | /* | |
847 | * direct-io write to a hole: fall through to buffered I/O | |
848 | * for completing the rest of the request. | |
849 | */ | |
850 | if (ret >= 0 && ret != count) { | |
851 | XFS_STATS_ADD(xs_write_bytes, ret); | |
852 | ||
853 | pos += ret; | |
854 | count -= ret; | |
855 | ||
1da177e4 LT |
856 | ioflags &= ~IO_ISDIRECT; |
857 | xfs_iunlock(xip, iolock); | |
858 | goto relock; | |
859 | } | |
860 | } else { | |
861 | xfs_rw_enter_trace(XFS_WRITE_ENTER, io, (void *)iovp, segs, | |
862 | *offset, ioflags); | |
863 | ret = generic_file_buffered_write(iocb, iovp, segs, | |
864 | pos, offset, count, ret); | |
865 | } | |
866 | ||
867 | current->backing_dev_info = NULL; | |
868 | ||
869 | if (ret == -EIOCBQUEUED && !(ioflags & IO_ISAIO)) | |
870 | ret = wait_on_sync_kiocb(iocb); | |
871 | ||
872 | if ((ret == -ENOSPC) && | |
873 | DM_EVENT_ENABLED(vp->v_vfsp, xip, DM_EVENT_NOSPACE) && | |
874 | !(ioflags & IO_INVIS)) { | |
875 | ||
876 | xfs_rwunlock(bdp, locktype); | |
a13828b1 | 877 | if (need_i_mutex) |
1b1dcc1b | 878 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
879 | error = XFS_SEND_NAMESP(xip->i_mount, DM_EVENT_NOSPACE, vp, |
880 | DM_RIGHT_NULL, vp, DM_RIGHT_NULL, NULL, NULL, | |
881 | 0, 0, 0); /* Delay flag intentionally unused */ | |
882 | if (error) | |
e1a40fa9 | 883 | goto out_nounlocks; |
a13828b1 | 884 | if (need_i_mutex) |
1b1dcc1b | 885 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
886 | xfs_rwlock(bdp, locktype); |
887 | pos = xip->i_d.di_size; | |
888 | ret = 0; | |
889 | goto retry; | |
890 | } | |
891 | ||
68bdb6ea YL |
892 | isize = i_size_read(inode); |
893 | if (unlikely(ret < 0 && ret != -EFAULT && *offset > isize)) | |
894 | *offset = isize; | |
895 | ||
1da177e4 LT |
896 | if (*offset > xip->i_d.di_size) { |
897 | xfs_ilock(xip, XFS_ILOCK_EXCL); | |
898 | if (*offset > xip->i_d.di_size) { | |
899 | xip->i_d.di_size = *offset; | |
900 | i_size_write(inode, *offset); | |
901 | xip->i_update_core = 1; | |
902 | xip->i_update_size = 1; | |
903 | } | |
904 | xfs_iunlock(xip, XFS_ILOCK_EXCL); | |
905 | } | |
906 | ||
907 | error = -ret; | |
908 | if (ret <= 0) | |
909 | goto out_unlock_internal; | |
910 | ||
911 | XFS_STATS_ADD(xs_write_bytes, ret); | |
912 | ||
913 | /* Handle various SYNC-type writes */ | |
914 | if ((file->f_flags & O_SYNC) || IS_SYNC(inode)) { | |
1e69dd0e NS |
915 | error = xfs_write_sync_logforce(mp, xip); |
916 | if (error) | |
917 | goto out_unlock_internal; | |
a13828b1 | 918 | |
1da177e4 | 919 | xfs_rwunlock(bdp, locktype); |
a13828b1 | 920 | if (need_i_mutex) |
1b1dcc1b | 921 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
922 | |
923 | error = sync_page_range(inode, mapping, pos, ret); | |
924 | if (!error) | |
925 | error = ret; | |
926 | return error; | |
927 | } | |
928 | ||
929 | out_unlock_internal: | |
930 | xfs_rwunlock(bdp, locktype); | |
a13828b1 NS |
931 | out_unlock_mutex: |
932 | if (need_i_mutex) | |
1b1dcc1b | 933 | mutex_unlock(&inode->i_mutex); |
e1a40fa9 | 934 | out_nounlocks: |
1da177e4 LT |
935 | return -error; |
936 | } | |
937 | ||
938 | /* | |
939 | * All xfs metadata buffers except log state machine buffers | |
940 | * get this attached as their b_bdstrat callback function. | |
941 | * This is so that we can catch a buffer | |
942 | * after prematurely unpinning it to forcibly shutdown the filesystem. | |
943 | */ | |
944 | int | |
945 | xfs_bdstrat_cb(struct xfs_buf *bp) | |
946 | { | |
947 | xfs_mount_t *mp; | |
948 | ||
949 | mp = XFS_BUF_FSPRIVATE3(bp, xfs_mount_t *); | |
950 | if (!XFS_FORCED_SHUTDOWN(mp)) { | |
ce8e922c | 951 | xfs_buf_iorequest(bp); |
1da177e4 LT |
952 | return 0; |
953 | } else { | |
954 | xfs_buftrace("XFS__BDSTRAT IOERROR", bp); | |
955 | /* | |
956 | * Metadata write that didn't get logged but | |
957 | * written delayed anyway. These aren't associated | |
958 | * with a transaction, and can be ignored. | |
959 | */ | |
960 | if (XFS_BUF_IODONE_FUNC(bp) == NULL && | |
961 | (XFS_BUF_ISREAD(bp)) == 0) | |
962 | return (xfs_bioerror_relse(bp)); | |
963 | else | |
964 | return (xfs_bioerror(bp)); | |
965 | } | |
966 | } | |
967 | ||
968 | ||
969 | int | |
970 | xfs_bmap(bhv_desc_t *bdp, | |
971 | xfs_off_t offset, | |
972 | ssize_t count, | |
973 | int flags, | |
974 | xfs_iomap_t *iomapp, | |
975 | int *niomaps) | |
976 | { | |
977 | xfs_inode_t *ip = XFS_BHVTOI(bdp); | |
978 | xfs_iocore_t *io = &ip->i_iocore; | |
979 | ||
980 | ASSERT((ip->i_d.di_mode & S_IFMT) == S_IFREG); | |
981 | ASSERT(((ip->i_d.di_flags & XFS_DIFLAG_REALTIME) != 0) == | |
982 | ((ip->i_iocore.io_flags & XFS_IOCORE_RT) != 0)); | |
983 | ||
984 | return xfs_iomap(io, offset, count, flags, iomapp, niomaps); | |
985 | } | |
986 | ||
987 | /* | |
988 | * Wrapper around bdstrat so that we can stop data | |
989 | * from going to disk in case we are shutting down the filesystem. | |
990 | * Typically user data goes thru this path; one of the exceptions | |
991 | * is the superblock. | |
992 | */ | |
993 | int | |
994 | xfsbdstrat( | |
995 | struct xfs_mount *mp, | |
996 | struct xfs_buf *bp) | |
997 | { | |
998 | ASSERT(mp); | |
999 | if (!XFS_FORCED_SHUTDOWN(mp)) { | |
1000 | /* Grio redirection would go here | |
1001 | * if (XFS_BUF_IS_GRIO(bp)) { | |
1002 | */ | |
1003 | ||
ce8e922c | 1004 | xfs_buf_iorequest(bp); |
1da177e4 LT |
1005 | return 0; |
1006 | } | |
1007 | ||
1008 | xfs_buftrace("XFSBDSTRAT IOERROR", bp); | |
1009 | return (xfs_bioerror_relse(bp)); | |
1010 | } | |
1011 | ||
1012 | /* | |
1013 | * If the underlying (data/log/rt) device is readonly, there are some | |
1014 | * operations that cannot proceed. | |
1015 | */ | |
1016 | int | |
1017 | xfs_dev_is_read_only( | |
1018 | xfs_mount_t *mp, | |
1019 | char *message) | |
1020 | { | |
1021 | if (xfs_readonly_buftarg(mp->m_ddev_targp) || | |
1022 | xfs_readonly_buftarg(mp->m_logdev_targp) || | |
1023 | (mp->m_rtdev_targp && xfs_readonly_buftarg(mp->m_rtdev_targp))) { | |
1024 | cmn_err(CE_NOTE, | |
1025 | "XFS: %s required on read-only device.", message); | |
1026 | cmn_err(CE_NOTE, | |
1027 | "XFS: write access unavailable, cannot proceed."); | |
1028 | return EROFS; | |
1029 | } | |
1030 | return 0; | |
1031 | } |