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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394...
[linux-2.6/kmemtrace.git] / fs / xfs / xfs_vfsops.c
blob30bacd8bb0e5b8a86251e3dbe03f9fe2c6f08ace
1 /*
2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
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
7 * published by the Free Software Foundation.
8 *
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.
13 *
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
17 */
18 #include "xfs.h"
19 #include "xfs_fs.h"
20 #include "xfs_types.h"
21 #include "xfs_bit.h"
22 #include "xfs_log.h"
23 #include "xfs_inum.h"
24 #include "xfs_trans.h"
25 #include "xfs_sb.h"
26 #include "xfs_ag.h"
27 #include "xfs_dir2.h"
28 #include "xfs_dmapi.h"
29 #include "xfs_mount.h"
30 #include "xfs_da_btree.h"
31 #include "xfs_bmap_btree.h"
32 #include "xfs_ialloc_btree.h"
33 #include "xfs_alloc_btree.h"
34 #include "xfs_dir2_sf.h"
35 #include "xfs_attr_sf.h"
36 #include "xfs_dinode.h"
37 #include "xfs_inode.h"
38 #include "xfs_inode_item.h"
39 #include "xfs_btree.h"
40 #include "xfs_alloc.h"
41 #include "xfs_ialloc.h"
42 #include "xfs_quota.h"
43 #include "xfs_error.h"
44 #include "xfs_bmap.h"
45 #include "xfs_rw.h"
46 #include "xfs_buf_item.h"
47 #include "xfs_log_priv.h"
48 #include "xfs_dir2_trace.h"
49 #include "xfs_extfree_item.h"
50 #include "xfs_acl.h"
51 #include "xfs_attr.h"
52 #include "xfs_clnt.h"
53 #include "xfs_mru_cache.h"
54 #include "xfs_filestream.h"
55 #include "xfs_fsops.h"
56 #include "xfs_vnodeops.h"
57 #include "xfs_vfsops.h"
58 #include "xfs_utils.h"
59
60
61 int __init
62 xfs_init(void)
63 {
64 #ifdef XFS_DABUF_DEBUG
65 extern spinlock_t xfs_dabuf_global_lock;
66 spin_lock_init(&xfs_dabuf_global_lock);
67 #endif
68
69 /*
70 * Initialize all of the zone allocators we use.
71 */
72 xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t),
73 "xfs_log_ticket");
74 xfs_bmap_free_item_zone = kmem_zone_init(sizeof(xfs_bmap_free_item_t),
75 "xfs_bmap_free_item");
76 xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
77 "xfs_btree_cur");
78 xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t),
79 "xfs_da_state");
80 xfs_dabuf_zone = kmem_zone_init(sizeof(xfs_dabuf_t), "xfs_dabuf");
81 xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
82 xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
83 xfs_acl_zone_init(xfs_acl_zone, "xfs_acl");
84 xfs_mru_cache_init();
85 xfs_filestream_init();
86
87 /*
88 * The size of the zone allocated buf log item is the maximum
89 * size possible under XFS. This wastes a little bit of memory,
90 * but it is much faster.
91 */
92 xfs_buf_item_zone =
93 kmem_zone_init((sizeof(xfs_buf_log_item_t) +
94 (((XFS_MAX_BLOCKSIZE / XFS_BLI_CHUNK) /
95 NBWORD) * sizeof(int))),
96 "xfs_buf_item");
97 xfs_efd_zone =
98 kmem_zone_init((sizeof(xfs_efd_log_item_t) +
99 ((XFS_EFD_MAX_FAST_EXTENTS - 1) *
100 sizeof(xfs_extent_t))),
101 "xfs_efd_item");
102 xfs_efi_zone =
103 kmem_zone_init((sizeof(xfs_efi_log_item_t) +
104 ((XFS_EFI_MAX_FAST_EXTENTS - 1) *
105 sizeof(xfs_extent_t))),
106 "xfs_efi_item");
107
108 /*
109 * These zones warrant special memory allocator hints
110 */
111 xfs_inode_zone =
112 kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode",
113 KM_ZONE_HWALIGN | KM_ZONE_RECLAIM |
114 KM_ZONE_SPREAD, NULL);
115 xfs_ili_zone =
116 kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili",
117 KM_ZONE_SPREAD, NULL);
118
119 /*
120 * Allocate global trace buffers.
121 */
122 #ifdef XFS_ALLOC_TRACE
123 xfs_alloc_trace_buf = ktrace_alloc(XFS_ALLOC_TRACE_SIZE, KM_SLEEP);
124 #endif
125 #ifdef XFS_BMAP_TRACE
126 xfs_bmap_trace_buf = ktrace_alloc(XFS_BMAP_TRACE_SIZE, KM_SLEEP);
127 #endif
128 #ifdef XFS_BMBT_TRACE
129 xfs_bmbt_trace_buf = ktrace_alloc(XFS_BMBT_TRACE_SIZE, KM_SLEEP);
130 #endif
131 #ifdef XFS_ATTR_TRACE
132 xfs_attr_trace_buf = ktrace_alloc(XFS_ATTR_TRACE_SIZE, KM_SLEEP);
133 #endif
134 #ifdef XFS_DIR2_TRACE
135 xfs_dir2_trace_buf = ktrace_alloc(XFS_DIR2_GTRACE_SIZE, KM_SLEEP);
136 #endif
137
138 xfs_dir_startup();
139
140 #if (defined(DEBUG) || defined(INDUCE_IO_ERROR))
141 xfs_error_test_init();
142 #endif /* DEBUG || INDUCE_IO_ERROR */
143
144 xfs_init_procfs();
145 xfs_sysctl_register();
146 return 0;
147 }
148
149 void __exit
150 xfs_cleanup(void)
151 {
152 extern kmem_zone_t *xfs_inode_zone;
153 extern kmem_zone_t *xfs_efd_zone;
154 extern kmem_zone_t *xfs_efi_zone;
155
156 xfs_cleanup_procfs();
157 xfs_sysctl_unregister();
158 xfs_filestream_uninit();
159 xfs_mru_cache_uninit();
160 xfs_acl_zone_destroy(xfs_acl_zone);
161
162 #ifdef XFS_DIR2_TRACE
163 ktrace_free(xfs_dir2_trace_buf);
164 #endif
165 #ifdef XFS_ATTR_TRACE
166 ktrace_free(xfs_attr_trace_buf);
167 #endif
168 #ifdef XFS_BMBT_TRACE
169 ktrace_free(xfs_bmbt_trace_buf);
170 #endif
171 #ifdef XFS_BMAP_TRACE
172 ktrace_free(xfs_bmap_trace_buf);
173 #endif
174 #ifdef XFS_ALLOC_TRACE
175 ktrace_free(xfs_alloc_trace_buf);
176 #endif
177
178 kmem_zone_destroy(xfs_bmap_free_item_zone);
179 kmem_zone_destroy(xfs_btree_cur_zone);
180 kmem_zone_destroy(xfs_inode_zone);
181 kmem_zone_destroy(xfs_trans_zone);
182 kmem_zone_destroy(xfs_da_state_zone);
183 kmem_zone_destroy(xfs_dabuf_zone);
184 kmem_zone_destroy(xfs_buf_item_zone);
185 kmem_zone_destroy(xfs_efd_zone);
186 kmem_zone_destroy(xfs_efi_zone);
187 kmem_zone_destroy(xfs_ifork_zone);
188 kmem_zone_destroy(xfs_ili_zone);
189 kmem_zone_destroy(xfs_log_ticket_zone);
190 }
191
192 /*
193 * xfs_start_flags
194 *
195 * This function fills in xfs_mount_t fields based on mount args.
196 * Note: the superblock has _not_ yet been read in.
197 */
198 STATIC int
199 xfs_start_flags(
200 struct xfs_mount_args *ap,
201 struct xfs_mount *mp)
202 {
203 /* Values are in BBs */
204 if ((ap->flags & XFSMNT_NOALIGN) != XFSMNT_NOALIGN) {
205 /*
206 * At this point the superblock has not been read
207 * in, therefore we do not know the block size.
208 * Before the mount call ends we will convert
209 * these to FSBs.
210 */
211 mp->m_dalign = ap->sunit;
212 mp->m_swidth = ap->swidth;
213 }
214
215 if (ap->logbufs != -1 &&
216 ap->logbufs != 0 &&
217 (ap->logbufs < XLOG_MIN_ICLOGS ||
218 ap->logbufs > XLOG_MAX_ICLOGS)) {
219 cmn_err(CE_WARN,
220 "XFS: invalid logbufs value: %d [not %d-%d]",
221 ap->logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
222 return XFS_ERROR(EINVAL);
223 }
224 mp->m_logbufs = ap->logbufs;
225 if (ap->logbufsize != -1 &&
226 ap->logbufsize != 0 &&
227 (ap->logbufsize < XLOG_MIN_RECORD_BSIZE ||
228 ap->logbufsize > XLOG_MAX_RECORD_BSIZE ||
229 !is_power_of_2(ap->logbufsize))) {
230 cmn_err(CE_WARN,
231 "XFS: invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
232 ap->logbufsize);
233 return XFS_ERROR(EINVAL);
234 }
235 mp->m_logbsize = ap->logbufsize;
236 mp->m_fsname_len = strlen(ap->fsname) + 1;
237 mp->m_fsname = kmem_alloc(mp->m_fsname_len, KM_SLEEP);
238 strcpy(mp->m_fsname, ap->fsname);
239 if (ap->rtname[0]) {
240 mp->m_rtname = kmem_alloc(strlen(ap->rtname) + 1, KM_SLEEP);
241 strcpy(mp->m_rtname, ap->rtname);
242 }
243 if (ap->logname[0]) {
244 mp->m_logname = kmem_alloc(strlen(ap->logname) + 1, KM_SLEEP);
245 strcpy(mp->m_logname, ap->logname);
246 }
247
248 if (ap->flags & XFSMNT_WSYNC)
249 mp->m_flags |= XFS_MOUNT_WSYNC;
250 #if XFS_BIG_INUMS
251 if (ap->flags & XFSMNT_INO64) {
252 mp->m_flags |= XFS_MOUNT_INO64;
253 mp->m_inoadd = XFS_INO64_OFFSET;
254 }
255 #endif
256 if (ap->flags & XFSMNT_RETERR)
257 mp->m_flags |= XFS_MOUNT_RETERR;
258 if (ap->flags & XFSMNT_NOALIGN)
259 mp->m_flags |= XFS_MOUNT_NOALIGN;
260 if (ap->flags & XFSMNT_SWALLOC)
261 mp->m_flags |= XFS_MOUNT_SWALLOC;
262 if (ap->flags & XFSMNT_OSYNCISOSYNC)
263 mp->m_flags |= XFS_MOUNT_OSYNCISOSYNC;
264 if (ap->flags & XFSMNT_32BITINODES)
265 mp->m_flags |= XFS_MOUNT_32BITINODES;
266
267 if (ap->flags & XFSMNT_IOSIZE) {
268 if (ap->iosizelog > XFS_MAX_IO_LOG ||
269 ap->iosizelog < XFS_MIN_IO_LOG) {
270 cmn_err(CE_WARN,
271 "XFS: invalid log iosize: %d [not %d-%d]",
272 ap->iosizelog, XFS_MIN_IO_LOG,
273 XFS_MAX_IO_LOG);
274 return XFS_ERROR(EINVAL);
275 }
276
277 mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
278 mp->m_readio_log = mp->m_writeio_log = ap->iosizelog;
279 }
280
281 if (ap->flags & XFSMNT_IKEEP)
282 mp->m_flags |= XFS_MOUNT_IKEEP;
283 if (ap->flags & XFSMNT_DIRSYNC)
284 mp->m_flags |= XFS_MOUNT_DIRSYNC;
285 if (ap->flags & XFSMNT_ATTR2)
286 mp->m_flags |= XFS_MOUNT_ATTR2;
287
288 if (ap->flags2 & XFSMNT2_COMPAT_IOSIZE)
289 mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
290
291 /*
292 * no recovery flag requires a read-only mount
293 */
294 if (ap->flags & XFSMNT_NORECOVERY) {
295 if (!(mp->m_flags & XFS_MOUNT_RDONLY)) {
296 cmn_err(CE_WARN,
297 "XFS: tried to mount a FS read-write without recovery!");
298 return XFS_ERROR(EINVAL);
299 }
300 mp->m_flags |= XFS_MOUNT_NORECOVERY;
301 }
302
303 if (ap->flags & XFSMNT_NOUUID)
304 mp->m_flags |= XFS_MOUNT_NOUUID;
305 if (ap->flags & XFSMNT_BARRIER)
306 mp->m_flags |= XFS_MOUNT_BARRIER;
307 else
308 mp->m_flags &= ~XFS_MOUNT_BARRIER;
309
310 if (ap->flags2 & XFSMNT2_FILESTREAMS)
311 mp->m_flags |= XFS_MOUNT_FILESTREAMS;
312
313 if (ap->flags & XFSMNT_DMAPI)
314 mp->m_flags |= XFS_MOUNT_DMAPI;
315 return 0;
316 }
317
318 /*
319 * This function fills in xfs_mount_t fields based on mount args.
320 * Note: the superblock _has_ now been read in.
321 */
322 STATIC int
323 xfs_finish_flags(
324 struct xfs_mount_args *ap,
325 struct xfs_mount *mp)
326 {
327 int ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
328
329 /* Fail a mount where the logbuf is smaller then the log stripe */
330 if (xfs_sb_version_haslogv2(&mp->m_sb)) {
331 if ((ap->logbufsize <= 0) &&
332 (mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE)) {
333 mp->m_logbsize = mp->m_sb.sb_logsunit;
334 } else if (ap->logbufsize > 0 &&
335 ap->logbufsize < mp->m_sb.sb_logsunit) {
336 cmn_err(CE_WARN,
337 "XFS: logbuf size must be greater than or equal to log stripe size");
338 return XFS_ERROR(EINVAL);
339 }
340 } else {
341 /* Fail a mount if the logbuf is larger than 32K */
342 if (ap->logbufsize > XLOG_BIG_RECORD_BSIZE) {
343 cmn_err(CE_WARN,
344 "XFS: logbuf size for version 1 logs must be 16K or 32K");
345 return XFS_ERROR(EINVAL);
346 }
347 }
348
349 if (xfs_sb_version_hasattr2(&mp->m_sb))
350 mp->m_flags |= XFS_MOUNT_ATTR2;
351
352 /*
353 * prohibit r/w mounts of read-only filesystems
354 */
355 if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
356 cmn_err(CE_WARN,
357 "XFS: cannot mount a read-only filesystem as read-write");
358 return XFS_ERROR(EROFS);
359 }
360
361 /*
362 * check for shared mount.
363 */
364 if (ap->flags & XFSMNT_SHARED) {
365 if (!xfs_sb_version_hasshared(&mp->m_sb))
366 return XFS_ERROR(EINVAL);
367
368 /*
369 * For IRIX 6.5, shared mounts must have the shared
370 * version bit set, have the persistent readonly
371 * field set, must be version 0 and can only be mounted
372 * read-only.
373 */
374 if (!ronly || !(mp->m_sb.sb_flags & XFS_SBF_READONLY) ||
375 (mp->m_sb.sb_shared_vn != 0))
376 return XFS_ERROR(EINVAL);
377
378 mp->m_flags |= XFS_MOUNT_SHARED;
379
380 /*
381 * Shared XFS V0 can't deal with DMI. Return EINVAL.
382 */
383 if (mp->m_sb.sb_shared_vn == 0 && (ap->flags & XFSMNT_DMAPI))
384 return XFS_ERROR(EINVAL);
385 }
386
387 if (ap->flags & XFSMNT_UQUOTA) {
388 mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
389 if (ap->flags & XFSMNT_UQUOTAENF)
390 mp->m_qflags |= XFS_UQUOTA_ENFD;
391 }
392
393 if (ap->flags & XFSMNT_GQUOTA) {
394 mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
395 if (ap->flags & XFSMNT_GQUOTAENF)
396 mp->m_qflags |= XFS_OQUOTA_ENFD;
397 } else if (ap->flags & XFSMNT_PQUOTA) {
398 mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
399 if (ap->flags & XFSMNT_PQUOTAENF)
400 mp->m_qflags |= XFS_OQUOTA_ENFD;
401 }
402
403 return 0;
404 }
405
406 /*
407 * xfs_mount
408 *
409 * The file system configurations are:
410 * (1) device (partition) with data and internal log
411 * (2) logical volume with data and log subvolumes.
412 * (3) logical volume with data, log, and realtime subvolumes.
413 *
414 * We only have to handle opening the log and realtime volumes here if
415 * they are present. The data subvolume has already been opened by
416 * get_sb_bdev() and is stored in vfsp->vfs_super->s_bdev.
417 */
418 int
419 xfs_mount(
420 struct xfs_mount *mp,
421 struct xfs_mount_args *args,
422 cred_t *credp)
423 {
424 struct block_device *ddev, *logdev, *rtdev;
425 int flags = 0, error;
426
427 ddev = mp->m_super->s_bdev;
428 logdev = rtdev = NULL;
429
430 error = xfs_dmops_get(mp, args);
431 if (error)
432 return error;
433 error = xfs_qmops_get(mp, args);
434 if (error)
435 return error;
436
437 if (args->flags & XFSMNT_QUIET)
438 flags |= XFS_MFSI_QUIET;
439
440 /*
441 * Open real time and log devices - order is important.
442 */
443 if (args->logname[0]) {
444 error = xfs_blkdev_get(mp, args->logname, &logdev);
445 if (error)
446 return error;
447 }
448 if (args->rtname[0]) {
449 error = xfs_blkdev_get(mp, args->rtname, &rtdev);
450 if (error) {
451 xfs_blkdev_put(logdev);
452 return error;
453 }
454
455 if (rtdev == ddev || rtdev == logdev) {
456 cmn_err(CE_WARN,
457 "XFS: Cannot mount filesystem with identical rtdev and ddev/logdev.");
458 xfs_blkdev_put(logdev);
459 xfs_blkdev_put(rtdev);
460 return EINVAL;
461 }
462 }
463
464 /*
465 * Setup xfs_mount buffer target pointers
466 */
467 error = ENOMEM;
468 mp->m_ddev_targp = xfs_alloc_buftarg(ddev, 0);
469 if (!mp->m_ddev_targp) {
470 xfs_blkdev_put(logdev);
471 xfs_blkdev_put(rtdev);
472 return error;
473 }
474 if (rtdev) {
475 mp->m_rtdev_targp = xfs_alloc_buftarg(rtdev, 1);
476 if (!mp->m_rtdev_targp) {
477 xfs_blkdev_put(logdev);
478 xfs_blkdev_put(rtdev);
479 goto error0;
480 }
481 }
482 mp->m_logdev_targp = (logdev && logdev != ddev) ?
483 xfs_alloc_buftarg(logdev, 1) : mp->m_ddev_targp;
484 if (!mp->m_logdev_targp) {
485 xfs_blkdev_put(logdev);
486 xfs_blkdev_put(rtdev);
487 goto error0;
488 }
489
490 /*
491 * Setup flags based on mount(2) options and then the superblock
492 */
493 error = xfs_start_flags(args, mp);
494 if (error)
495 goto error1;
496 error = xfs_readsb(mp, flags);
497 if (error)
498 goto error1;
499 error = xfs_finish_flags(args, mp);
500 if (error)
501 goto error2;
502
503 /*
504 * Setup xfs_mount buffer target pointers based on superblock
505 */
506 error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_blocksize,
507 mp->m_sb.sb_sectsize);
508 if (!error && logdev && logdev != ddev) {
509 unsigned int log_sector_size = BBSIZE;
510
511 if (xfs_sb_version_hassector(&mp->m_sb))
512 log_sector_size = mp->m_sb.sb_logsectsize;
513 error = xfs_setsize_buftarg(mp->m_logdev_targp,
514 mp->m_sb.sb_blocksize,
515 log_sector_size);
516 }
517 if (!error && rtdev)
518 error = xfs_setsize_buftarg(mp->m_rtdev_targp,
519 mp->m_sb.sb_blocksize,
520 mp->m_sb.sb_sectsize);
521 if (error)
522 goto error2;
523
524 if (mp->m_flags & XFS_MOUNT_BARRIER)
525 xfs_mountfs_check_barriers(mp);
526
527 if ((error = xfs_filestream_mount(mp)))
528 goto error2;
529
530 error = xfs_mountfs(mp, flags);
531 if (error)
532 goto error2;
533
534 XFS_SEND_MOUNT(mp, DM_RIGHT_NULL, args->mtpt, args->fsname);
535
536 return 0;
537
538 error2:
539 if (mp->m_sb_bp)
540 xfs_freesb(mp);
541 error1:
542 xfs_binval(mp->m_ddev_targp);
543 if (logdev && logdev != ddev)
544 xfs_binval(mp->m_logdev_targp);
545 if (rtdev)
546 xfs_binval(mp->m_rtdev_targp);
547 error0:
548 xfs_unmountfs_close(mp, credp);
549 xfs_qmops_put(mp);
550 xfs_dmops_put(mp);
551 return error;
552 }
553
554 int
555 xfs_unmount(
556 xfs_mount_t *mp,
557 int flags,
558 cred_t *credp)
559 {
560 xfs_inode_t *rip;
561 bhv_vnode_t *rvp;
562 int unmount_event_wanted = 0;
563 int unmount_event_flags = 0;
564 int xfs_unmountfs_needed = 0;
565 int error;
566
567 rip = mp->m_rootip;
568 rvp = XFS_ITOV(rip);
569
570 #ifdef HAVE_DMAPI
571 if (mp->m_flags & XFS_MOUNT_DMAPI) {
572 error = XFS_SEND_PREUNMOUNT(mp,
573 rip, DM_RIGHT_NULL, rip, DM_RIGHT_NULL,
574 NULL, NULL, 0, 0,
575 (mp->m_dmevmask & (1<<DM_EVENT_PREUNMOUNT))?
576 0:DM_FLAGS_UNWANTED);
577 if (error)
578 return XFS_ERROR(error);
579 unmount_event_wanted = 1;
580 unmount_event_flags = (mp->m_dmevmask & (1<<DM_EVENT_UNMOUNT))?
581 0 : DM_FLAGS_UNWANTED;
582 }
583 #endif
584
585 /*
586 * Blow away any referenced inode in the filestreams cache.
587 * This can and will cause log traffic as inodes go inactive
588 * here.
589 */
590 xfs_filestream_unmount(mp);
591
592 XFS_bflush(mp->m_ddev_targp);
593 error = xfs_unmount_flush(mp, 0);
594 if (error)
595 goto out;
596
597 ASSERT(vn_count(rvp) == 1);
598
599 /*
600 * Drop the reference count
601 */
602 IRELE(rip);
603
604 /*
605 * If we're forcing a shutdown, typically because of a media error,
606 * we want to make sure we invalidate dirty pages that belong to
607 * referenced vnodes as well.
608 */
609 if (XFS_FORCED_SHUTDOWN(mp)) {
610 error = xfs_sync(mp, SYNC_WAIT | SYNC_CLOSE);
611 ASSERT(error != EFSCORRUPTED);
612 }
613 xfs_unmountfs_needed = 1;
614
615 out:
616 /* Send DMAPI event, if required.
617 * Then do xfs_unmountfs() if needed.
618 * Then return error (or zero).
619 */
620 if (unmount_event_wanted) {
621 /* Note: mp structure must still exist for
622 * XFS_SEND_UNMOUNT() call.
623 */
624 XFS_SEND_UNMOUNT(mp, error == 0 ? rip : NULL,
625 DM_RIGHT_NULL, 0, error, unmount_event_flags);
626 }
627 if (xfs_unmountfs_needed) {
628 /*
629 * Call common unmount function to flush to disk
630 * and free the super block buffer & mount structures.
631 */
632 xfs_unmountfs(mp, credp);
633 xfs_qmops_put(mp);
634 xfs_dmops_put(mp);
635 kmem_free(mp, sizeof(xfs_mount_t));
636 }
637
638 return XFS_ERROR(error);
639 }
640
641 STATIC void
642 xfs_quiesce_fs(
643 xfs_mount_t *mp)
644 {
645 int count = 0, pincount;
646
647 xfs_flush_buftarg(mp->m_ddev_targp, 0);
648 xfs_finish_reclaim_all(mp, 0);
649
650 /* This loop must run at least twice.
651 * The first instance of the loop will flush
652 * most meta data but that will generate more
653 * meta data (typically directory updates).
654 * Which then must be flushed and logged before
655 * we can write the unmount record.
656 */
657 do {
658 xfs_syncsub(mp, SYNC_INODE_QUIESCE, NULL);
659 pincount = xfs_flush_buftarg(mp->m_ddev_targp, 1);
660 if (!pincount) {
661 delay(50);
662 count++;
663 }
664 } while (count < 2);
665 }
666
667 /*
668 * Second stage of a quiesce. The data is already synced, now we have to take
669 * care of the metadata. New transactions are already blocked, so we need to
670 * wait for any remaining transactions to drain out before proceding.
671 */
672 void
673 xfs_attr_quiesce(
674 xfs_mount_t *mp)
675 {
676 int error = 0;
677
678 /* wait for all modifications to complete */
679 while (atomic_read(&mp->m_active_trans) > 0)
680 delay(100);
681
682 /* flush inodes and push all remaining buffers out to disk */
683 xfs_quiesce_fs(mp);
684
685 ASSERT_ALWAYS(atomic_read(&mp->m_active_trans) == 0);
686
687 /* Push the superblock and write an unmount record */
688 error = xfs_log_sbcount(mp, 1);
689 if (error)
690 xfs_fs_cmn_err(CE_WARN, mp,
691 "xfs_attr_quiesce: failed to log sb changes. "
692 "Frozen image may not be consistent.");
693 xfs_log_unmount_write(mp);
694 xfs_unmountfs_writesb(mp);
695 }
696
697 int
698 xfs_mntupdate(
699 struct xfs_mount *mp,
700 int *flags,
701 struct xfs_mount_args *args)
702 {
703 if (!(*flags & MS_RDONLY)) { /* rw/ro -> rw */
704 if (mp->m_flags & XFS_MOUNT_RDONLY)
705 mp->m_flags &= ~XFS_MOUNT_RDONLY;
706 if (args->flags & XFSMNT_BARRIER) {
707 mp->m_flags |= XFS_MOUNT_BARRIER;
708 xfs_mountfs_check_barriers(mp);
709 } else {
710 mp->m_flags &= ~XFS_MOUNT_BARRIER;
711 }
712 } else if (!(mp->m_flags & XFS_MOUNT_RDONLY)) { /* rw -> ro */
713 xfs_filestream_flush(mp);
714 xfs_sync(mp, SYNC_DATA_QUIESCE);
715 xfs_attr_quiesce(mp);
716 mp->m_flags |= XFS_MOUNT_RDONLY;
717 }
718 return 0;
719 }
720
721 /*
722 * xfs_unmount_flush implements a set of flush operation on special
723 * inodes, which are needed as a separate set of operations so that
724 * they can be called as part of relocation process.
725 */
726 int
727 xfs_unmount_flush(
728 xfs_mount_t *mp, /* Mount structure we are getting
729 rid of. */
730 int relocation) /* Called from vfs relocation. */
731 {
732 xfs_inode_t *rip = mp->m_rootip;
733 xfs_inode_t *rbmip;
734 xfs_inode_t *rsumip = NULL;
735 bhv_vnode_t *rvp = XFS_ITOV(rip);
736 int error;
737
738 xfs_ilock(rip, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
739 xfs_iflock(rip);
740
741 /*
742 * Flush out the real time inodes.
743 */
744 if ((rbmip = mp->m_rbmip) != NULL) {
745 xfs_ilock(rbmip, XFS_ILOCK_EXCL);
746 xfs_iflock(rbmip);
747 error = xfs_iflush(rbmip, XFS_IFLUSH_SYNC);
748 xfs_iunlock(rbmip, XFS_ILOCK_EXCL);
749
750 if (error == EFSCORRUPTED)
751 goto fscorrupt_out;
752
753 ASSERT(vn_count(XFS_ITOV(rbmip)) == 1);
754
755 rsumip = mp->m_rsumip;
756 xfs_ilock(rsumip, XFS_ILOCK_EXCL);
757 xfs_iflock(rsumip);
758 error = xfs_iflush(rsumip, XFS_IFLUSH_SYNC);
759 xfs_iunlock(rsumip, XFS_ILOCK_EXCL);
760
761 if (error == EFSCORRUPTED)
762 goto fscorrupt_out;
763
764 ASSERT(vn_count(XFS_ITOV(rsumip)) == 1);
765 }
766
767 /*
768 * Synchronously flush root inode to disk
769 */
770 error = xfs_iflush(rip, XFS_IFLUSH_SYNC);
771 if (error == EFSCORRUPTED)
772 goto fscorrupt_out2;
773
774 if (vn_count(rvp) != 1 && !relocation) {
775 xfs_iunlock(rip, XFS_ILOCK_EXCL);
776 return XFS_ERROR(EBUSY);
777 }
778
779 /*
780 * Release dquot that rootinode, rbmino and rsumino might be holding,
781 * flush and purge the quota inodes.
782 */
783 error = XFS_QM_UNMOUNT(mp);
784 if (error == EFSCORRUPTED)
785 goto fscorrupt_out2;
786
787 if (rbmip) {
788 IRELE(rbmip);
789 IRELE(rsumip);
790 }
791
792 xfs_iunlock(rip, XFS_ILOCK_EXCL);
793 return 0;
794
795 fscorrupt_out:
796 xfs_ifunlock(rip);
797
798 fscorrupt_out2:
799 xfs_iunlock(rip, XFS_ILOCK_EXCL);
800
801 return XFS_ERROR(EFSCORRUPTED);
802 }
803
804 /*
805 * xfs_sync flushes any pending I/O to file system vfsp.
806 *
807 * This routine is called by vfs_sync() to make sure that things make it
808 * out to disk eventually, on sync() system calls to flush out everything,
809 * and when the file system is unmounted. For the vfs_sync() case, all
810 * we really need to do is sync out the log to make all of our meta-data
811 * updates permanent (except for timestamps). For calls from pflushd(),
812 * dirty pages are kept moving by calling pdflush() on the inodes
813 * containing them. We also flush the inodes that we can lock without
814 * sleeping and the superblock if we can lock it without sleeping from
815 * vfs_sync() so that items at the tail of the log are always moving out.
816 *
817 * Flags:
818 * SYNC_BDFLUSH - We're being called from vfs_sync() so we don't want
819 * to sleep if we can help it. All we really need
820 * to do is ensure that the log is synced at least
821 * periodically. We also push the inodes and
822 * superblock if we can lock them without sleeping
823 * and they are not pinned.
824 * SYNC_ATTR - We need to flush the inodes. If SYNC_BDFLUSH is not
825 * set, then we really want to lock each inode and flush
826 * it.
827 * SYNC_WAIT - All the flushes that take place in this call should
828 * be synchronous.
829 * SYNC_DELWRI - This tells us to push dirty pages associated with
830 * inodes. SYNC_WAIT and SYNC_BDFLUSH are used to
831 * determine if they should be flushed sync, async, or
832 * delwri.
833 * SYNC_CLOSE - This flag is passed when the system is being
834 * unmounted. We should sync and invalidate everything.
835 * SYNC_FSDATA - This indicates that the caller would like to make
836 * sure the superblock is safe on disk. We can ensure
837 * this by simply making sure the log gets flushed
838 * if SYNC_BDFLUSH is set, and by actually writing it
839 * out otherwise.
840 * SYNC_IOWAIT - The caller wants us to wait for all data I/O to complete
841 * before we return (including direct I/O). Forms the drain
842 * side of the write barrier needed to safely quiesce the
843 * filesystem.
844 *
845 */
846 int
847 xfs_sync(
848 xfs_mount_t *mp,
849 int flags)
850 {
851 int error;
852
853 /*
854 * Get the Quota Manager to flush the dquots.
855 *
856 * If XFS quota support is not enabled or this filesystem
857 * instance does not use quotas XFS_QM_DQSYNC will always
858 * return zero.
859 */
860 error = XFS_QM_DQSYNC(mp, flags);
861 if (error) {
862 /*
863 * If we got an IO error, we will be shutting down.
864 * So, there's nothing more for us to do here.
865 */
866 ASSERT(error != EIO || XFS_FORCED_SHUTDOWN(mp));
867 if (XFS_FORCED_SHUTDOWN(mp))
868 return XFS_ERROR(error);
869 }
870
871 if (flags & SYNC_IOWAIT)
872 xfs_filestream_flush(mp);
873
874 return xfs_syncsub(mp, flags, NULL);
875 }
876
877 /*
878 * xfs sync routine for internal use
879 *
880 * This routine supports all of the flags defined for the generic vfs_sync
881 * interface as explained above under xfs_sync.
882 *
883 */
884 int
885 xfs_sync_inodes(
886 xfs_mount_t *mp,
887 int flags,
888 int *bypassed)
889 {
890 xfs_inode_t *ip = NULL;
891 bhv_vnode_t *vp = NULL;
892 int error;
893 int last_error;
894 uint64_t fflag;
895 uint lock_flags;
896 uint base_lock_flags;
897 boolean_t mount_locked;
898 boolean_t vnode_refed;
899 int preempt;
900 xfs_iptr_t *ipointer;
901 #ifdef DEBUG
902 boolean_t ipointer_in = B_FALSE;
903
904 #define IPOINTER_SET ipointer_in = B_TRUE
905 #define IPOINTER_CLR ipointer_in = B_FALSE
906 #else
907 #define IPOINTER_SET
908 #define IPOINTER_CLR
909 #endif
910
911
912 /* Insert a marker record into the inode list after inode ip. The list
913 * must be locked when this is called. After the call the list will no
914 * longer be locked.
915 */
916 #define IPOINTER_INSERT(ip, mp) { \
917 ASSERT(ipointer_in == B_FALSE); \
918 ipointer->ip_mnext = ip->i_mnext; \
919 ipointer->ip_mprev = ip; \
920 ip->i_mnext = (xfs_inode_t *)ipointer; \
921 ipointer->ip_mnext->i_mprev = (xfs_inode_t *)ipointer; \
922 preempt = 0; \
923 XFS_MOUNT_IUNLOCK(mp); \
924 mount_locked = B_FALSE; \
925 IPOINTER_SET; \
926 }
927
928 /* Remove the marker from the inode list. If the marker was the only item
929 * in the list then there are no remaining inodes and we should zero out
930 * the whole list. If we are the current head of the list then move the head
931 * past us.
932 */
933 #define IPOINTER_REMOVE(ip, mp) { \
934 ASSERT(ipointer_in == B_TRUE); \
935 if (ipointer->ip_mnext != (xfs_inode_t *)ipointer) { \
936 ip = ipointer->ip_mnext; \
937 ip->i_mprev = ipointer->ip_mprev; \
938 ipointer->ip_mprev->i_mnext = ip; \
939 if (mp->m_inodes == (xfs_inode_t *)ipointer) { \
940 mp->m_inodes = ip; \
941 } \
942 } else { \
943 ASSERT(mp->m_inodes == (xfs_inode_t *)ipointer); \
944 mp->m_inodes = NULL; \
945 ip = NULL; \
946 } \
947 IPOINTER_CLR; \
948 }
949
950 #define XFS_PREEMPT_MASK 0x7f
951
952 ASSERT(!(flags & SYNC_BDFLUSH));
953
954 if (bypassed)
955 *bypassed = 0;
956 if (mp->m_flags & XFS_MOUNT_RDONLY)
957 return 0;
958 error = 0;
959 last_error = 0;
960 preempt = 0;
961
962 /* Allocate a reference marker */
963 ipointer = (xfs_iptr_t *)kmem_zalloc(sizeof(xfs_iptr_t), KM_SLEEP);
964
965 fflag = XFS_B_ASYNC; /* default is don't wait */
966 if (flags & SYNC_DELWRI)
967 fflag = XFS_B_DELWRI;
968 if (flags & SYNC_WAIT)
969 fflag = 0; /* synchronous overrides all */
970
971 base_lock_flags = XFS_ILOCK_SHARED;
972 if (flags & (SYNC_DELWRI | SYNC_CLOSE)) {
973 /*
974 * We need the I/O lock if we're going to call any of
975 * the flush/inval routines.
976 */
977 base_lock_flags |= XFS_IOLOCK_SHARED;
978 }
979
980 XFS_MOUNT_ILOCK(mp);
981
982 ip = mp->m_inodes;
983
984 mount_locked = B_TRUE;
985 vnode_refed = B_FALSE;
986
987 IPOINTER_CLR;
988
989 do {
990 ASSERT(ipointer_in == B_FALSE);
991 ASSERT(vnode_refed == B_FALSE);
992
993 lock_flags = base_lock_flags;
994
995 /*
996 * There were no inodes in the list, just break out
997 * of the loop.
998 */
999 if (ip == NULL) {
1000 break;
1001 }
1002
1003 /*
1004 * We found another sync thread marker - skip it
1005 */
1006 if (ip->i_mount == NULL) {
1007 ip = ip->i_mnext;
1008 continue;
1009 }
1010
1011 vp = XFS_ITOV_NULL(ip);
1012
1013 /*
1014 * If the vnode is gone then this is being torn down,
1015 * call reclaim if it is flushed, else let regular flush
1016 * code deal with it later in the loop.
1017 */
1018
1019 if (vp == NULL) {
1020 /* Skip ones already in reclaim */
1021 if (ip->i_flags & XFS_IRECLAIM) {
1022 ip = ip->i_mnext;
1023 continue;
1024 }
1025 if (xfs_ilock_nowait(ip, XFS_ILOCK_EXCL) == 0) {
1026 ip = ip->i_mnext;
1027 } else if ((xfs_ipincount(ip) == 0) &&
1028 xfs_iflock_nowait(ip)) {
1029 IPOINTER_INSERT(ip, mp);
1030
1031 xfs_finish_reclaim(ip, 1,
1032 XFS_IFLUSH_DELWRI_ELSE_ASYNC);
1033
1034 XFS_MOUNT_ILOCK(mp);
1035 mount_locked = B_TRUE;
1036 IPOINTER_REMOVE(ip, mp);
1037 } else {
1038 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1039 ip = ip->i_mnext;
1040 }
1041 continue;
1042 }
1043
1044 if (VN_BAD(vp)) {
1045 ip = ip->i_mnext;
1046 continue;
1047 }
1048
1049 if (XFS_FORCED_SHUTDOWN(mp) && !(flags & SYNC_CLOSE)) {
1050 XFS_MOUNT_IUNLOCK(mp);
1051 kmem_free(ipointer, sizeof(xfs_iptr_t));
1052 return 0;
1053 }
1054
1055 /*
1056 * Try to lock without sleeping. We're out of order with
1057 * the inode list lock here, so if we fail we need to drop
1058 * the mount lock and try again. If we're called from
1059 * bdflush() here, then don't bother.
1060 *
1061 * The inode lock here actually coordinates with the
1062 * almost spurious inode lock in xfs_ireclaim() to prevent
1063 * the vnode we handle here without a reference from
1064 * being freed while we reference it. If we lock the inode
1065 * while it's on the mount list here, then the spurious inode
1066 * lock in xfs_ireclaim() after the inode is pulled from
1067 * the mount list will sleep until we release it here.
1068 * This keeps the vnode from being freed while we reference
1069 * it.
1070 */
1071 if (xfs_ilock_nowait(ip, lock_flags) == 0) {
1072 if (vp == NULL) {
1073 ip = ip->i_mnext;
1074 continue;
1075 }
1076
1077 vp = vn_grab(vp);
1078 if (vp == NULL) {
1079 ip = ip->i_mnext;
1080 continue;
1081 }
1082
1083 IPOINTER_INSERT(ip, mp);
1084 xfs_ilock(ip, lock_flags);
1085
1086 ASSERT(vp == XFS_ITOV(ip));
1087 ASSERT(ip->i_mount == mp);
1088
1089 vnode_refed = B_TRUE;
1090 }
1091
1092 /* From here on in the loop we may have a marker record
1093 * in the inode list.
1094 */
1095
1096 /*
1097 * If we have to flush data or wait for I/O completion
1098 * we need to drop the ilock that we currently hold.
1099 * If we need to drop the lock, insert a marker if we
1100 * have not already done so.
1101 */
1102 if ((flags & (SYNC_CLOSE|SYNC_IOWAIT)) ||
1103 ((flags & SYNC_DELWRI) && VN_DIRTY(vp))) {
1104 if (mount_locked) {
1105 IPOINTER_INSERT(ip, mp);
1106 }
1107 xfs_iunlock(ip, XFS_ILOCK_SHARED);
1108
1109 if (flags & SYNC_CLOSE) {
1110 /* Shutdown case. Flush and invalidate. */
1111 if (XFS_FORCED_SHUTDOWN(mp))
1112 xfs_tosspages(ip, 0, -1,
1113 FI_REMAPF);
1114 else
1115 error = xfs_flushinval_pages(ip,
1116 0, -1, FI_REMAPF);
1117 } else if ((flags & SYNC_DELWRI) && VN_DIRTY(vp)) {
1118 error = xfs_flush_pages(ip, 0,
1119 -1, fflag, FI_NONE);
1120 }
1121
1122 /*
1123 * When freezing, we need to wait ensure all I/O (including direct
1124 * I/O) is complete to ensure no further data modification can take
1125 * place after this point
1126 */
1127 if (flags & SYNC_IOWAIT)
1128 vn_iowait(ip);
1129
1130 xfs_ilock(ip, XFS_ILOCK_SHARED);
1131 }
1132
1133 if ((flags & SYNC_ATTR) &&
1134 (ip->i_update_core ||
1135 (ip->i_itemp && ip->i_itemp->ili_format.ilf_fields))) {
1136 if (mount_locked)
1137 IPOINTER_INSERT(ip, mp);
1138
1139 if (flags & SYNC_WAIT) {
1140 xfs_iflock(ip);
1141 error = xfs_iflush(ip, XFS_IFLUSH_SYNC);
1142
1143 /*
1144 * If we can't acquire the flush lock, then the inode
1145 * is already being flushed so don't bother waiting.
1146 *
1147 * If we can lock it then do a delwri flush so we can
1148 * combine multiple inode flushes in each disk write.
1149 */
1150 } else if (xfs_iflock_nowait(ip)) {
1151 error = xfs_iflush(ip, XFS_IFLUSH_DELWRI);
1152 } else if (bypassed) {
1153 (*bypassed)++;
1154 }
1155 }
1156
1157 if (lock_flags != 0) {
1158 xfs_iunlock(ip, lock_flags);
1159 }
1160
1161 if (vnode_refed) {
1162 /*
1163 * If we had to take a reference on the vnode
1164 * above, then wait until after we've unlocked
1165 * the inode to release the reference. This is
1166 * because we can be already holding the inode
1167 * lock when IRELE() calls xfs_inactive().
1168 *
1169 * Make sure to drop the mount lock before calling
1170 * IRELE() so that we don't trip over ourselves if
1171 * we have to go for the mount lock again in the
1172 * inactive code.
1173 */
1174 if (mount_locked) {
1175 IPOINTER_INSERT(ip, mp);
1176 }
1177
1178 IRELE(ip);
1179
1180 vnode_refed = B_FALSE;
1181 }
1182
1183 if (error) {
1184 last_error = error;
1185 }
1186
1187 /*
1188 * bail out if the filesystem is corrupted.
1189 */
1190 if (error == EFSCORRUPTED) {
1191 if (!mount_locked) {
1192 XFS_MOUNT_ILOCK(mp);
1193 IPOINTER_REMOVE(ip, mp);
1194 }
1195 XFS_MOUNT_IUNLOCK(mp);
1196 ASSERT(ipointer_in == B_FALSE);
1197 kmem_free(ipointer, sizeof(xfs_iptr_t));
1198 return XFS_ERROR(error);
1199 }
1200
1201 /* Let other threads have a chance at the mount lock
1202 * if we have looped many times without dropping the
1203 * lock.
1204 */
1205 if ((++preempt & XFS_PREEMPT_MASK) == 0) {
1206 if (mount_locked) {
1207 IPOINTER_INSERT(ip, mp);
1208 }
1209 }
1210
1211 if (mount_locked == B_FALSE) {
1212 XFS_MOUNT_ILOCK(mp);
1213 mount_locked = B_TRUE;
1214 IPOINTER_REMOVE(ip, mp);
1215 continue;
1216 }
1217
1218 ASSERT(ipointer_in == B_FALSE);
1219 ip = ip->i_mnext;
1220
1221 } while (ip != mp->m_inodes);
1222
1223 XFS_MOUNT_IUNLOCK(mp);
1224
1225 ASSERT(ipointer_in == B_FALSE);
1226
1227 kmem_free(ipointer, sizeof(xfs_iptr_t));
1228 return XFS_ERROR(last_error);
1229 }
1230
1231 /*
1232 * xfs sync routine for internal use
1233 *
1234 * This routine supports all of the flags defined for the generic vfs_sync
1235 * interface as explained above under xfs_sync.
1236 *
1237 */
1238 int
1239 xfs_syncsub(
1240 xfs_mount_t *mp,
1241 int flags,
1242 int *bypassed)
1243 {
1244 int error = 0;
1245 int last_error = 0;
1246 uint log_flags = XFS_LOG_FORCE;
1247 xfs_buf_t *bp;
1248 xfs_buf_log_item_t *bip;
1249
1250 /*
1251 * Sync out the log. This ensures that the log is periodically
1252 * flushed even if there is not enough activity to fill it up.
1253 */
1254 if (flags & SYNC_WAIT)
1255 log_flags |= XFS_LOG_SYNC;
1256
1257 xfs_log_force(mp, (xfs_lsn_t)0, log_flags);
1258
1259 if (flags & (SYNC_ATTR|SYNC_DELWRI)) {
1260 if (flags & SYNC_BDFLUSH)
1261 xfs_finish_reclaim_all(mp, 1);
1262 else
1263 error = xfs_sync_inodes(mp, flags, bypassed);
1264 }
1265
1266 /*
1267 * Flushing out dirty data above probably generated more
1268 * log activity, so if this isn't vfs_sync() then flush
1269 * the log again.
1270 */
1271 if (flags & SYNC_DELWRI) {
1272 xfs_log_force(mp, (xfs_lsn_t)0, log_flags);
1273 }
1274
1275 if (flags & SYNC_FSDATA) {
1276 /*
1277 * If this is vfs_sync() then only sync the superblock
1278 * if we can lock it without sleeping and it is not pinned.
1279 */
1280 if (flags & SYNC_BDFLUSH) {
1281 bp = xfs_getsb(mp, XFS_BUF_TRYLOCK);
1282 if (bp != NULL) {
1283 bip = XFS_BUF_FSPRIVATE(bp,xfs_buf_log_item_t*);
1284 if ((bip != NULL) &&
1285 xfs_buf_item_dirty(bip)) {
1286 if (!(XFS_BUF_ISPINNED(bp))) {
1287 XFS_BUF_ASYNC(bp);
1288 error = xfs_bwrite(mp, bp);
1289 } else {
1290 xfs_buf_relse(bp);
1291 }
1292 } else {
1293 xfs_buf_relse(bp);
1294 }
1295 }
1296 } else {
1297 bp = xfs_getsb(mp, 0);
1298 /*
1299 * If the buffer is pinned then push on the log so
1300 * we won't get stuck waiting in the write for
1301 * someone, maybe ourselves, to flush the log.
1302 * Even though we just pushed the log above, we
1303 * did not have the superblock buffer locked at
1304 * that point so it can become pinned in between
1305 * there and here.
1306 */
1307 if (XFS_BUF_ISPINNED(bp))
1308 xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE);
1309 if (flags & SYNC_WAIT)
1310 XFS_BUF_UNASYNC(bp);
1311 else
1312 XFS_BUF_ASYNC(bp);
1313 error = xfs_bwrite(mp, bp);
1314 }
1315 if (error) {
1316 last_error = error;
1317 }
1318 }
1319
1320 /*
1321 * Now check to see if the log needs a "dummy" transaction.
1322 */
1323 if (!(flags & SYNC_REMOUNT) && xfs_log_need_covered(mp)) {
1324 xfs_trans_t *tp;
1325 xfs_inode_t *ip;
1326
1327 /*
1328 * Put a dummy transaction in the log to tell
1329 * recovery that all others are OK.
1330 */
1331 tp = xfs_trans_alloc(mp, XFS_TRANS_DUMMY1);
1332 if ((error = xfs_trans_reserve(tp, 0,
1333 XFS_ICHANGE_LOG_RES(mp),
1334 0, 0, 0))) {
1335 xfs_trans_cancel(tp, 0);
1336 return error;
1337 }
1338
1339 ip = mp->m_rootip;
1340 xfs_ilock(ip, XFS_ILOCK_EXCL);
1341
1342 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1343 xfs_trans_ihold(tp, ip);
1344 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1345 error = xfs_trans_commit(tp, 0);
1346 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1347 xfs_log_force(mp, (xfs_lsn_t)0, log_flags);
1348 }
1349
1350 /*
1351 * When shutting down, we need to insure that the AIL is pushed
1352 * to disk or the filesystem can appear corrupt from the PROM.
1353 */
1354 if ((flags & (SYNC_CLOSE|SYNC_WAIT)) == (SYNC_CLOSE|SYNC_WAIT)) {
1355 XFS_bflush(mp->m_ddev_targp);
1356 if (mp->m_rtdev_targp) {
1357 XFS_bflush(mp->m_rtdev_targp);
1358 }
1359 }
1360
1361 return XFS_ERROR(last_error);
1362 }
kmemtrace - Kernel memory tracer