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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6#include "xfs.h"
7#include "xfs_fs.h"
8#include "xfs_shared.h"
9#include "xfs_format.h"
10#include "xfs_log_format.h"
11#include "xfs_trans_resv.h"
12#include "xfs_bit.h"
13#include "xfs_sb.h"
14#include "xfs_mount.h"
15#include "xfs_inode.h"
16#include "xfs_dir2.h"
17#include "xfs_ialloc.h"
18#include "xfs_alloc.h"
19#include "xfs_rtalloc.h"
20#include "xfs_bmap.h"
21#include "xfs_trans.h"
22#include "xfs_trans_priv.h"
23#include "xfs_log.h"
24#include "xfs_log_priv.h"
25#include "xfs_error.h"
26#include "xfs_quota.h"
27#include "xfs_fsops.h"
28#include "xfs_icache.h"
29#include "xfs_sysfs.h"
30#include "xfs_rmap_btree.h"
31#include "xfs_refcount_btree.h"
32#include "xfs_reflink.h"
33#include "xfs_extent_busy.h"
34#include "xfs_health.h"
35#include "xfs_trace.h"
36#include "xfs_ag.h"
37
38static DEFINE_MUTEX(xfs_uuid_table_mutex);
39static int xfs_uuid_table_size;
40static uuid_t *xfs_uuid_table;
41
42void
43xfs_uuid_table_free(void)
44{
45 if (xfs_uuid_table_size == 0)
46 return;
47 kmem_free(xfs_uuid_table);
48 xfs_uuid_table = NULL;
49 xfs_uuid_table_size = 0;
50}
51
52/*
53 * See if the UUID is unique among mounted XFS filesystems.
54 * Mount fails if UUID is nil or a FS with the same UUID is already mounted.
55 */
56STATIC int
57xfs_uuid_mount(
58 struct xfs_mount *mp)
59{
60 uuid_t *uuid = &mp->m_sb.sb_uuid;
61 int hole, i;
62
63 /* Publish UUID in struct super_block */
64 uuid_copy(&mp->m_super->s_uuid, uuid);
65
66 if (xfs_has_nouuid(mp))
67 return 0;
68
69 if (uuid_is_null(uuid)) {
70 xfs_warn(mp, "Filesystem has null UUID - can't mount");
71 return -EINVAL;
72 }
73
74 mutex_lock(&xfs_uuid_table_mutex);
75 for (i = 0, hole = -1; i < xfs_uuid_table_size; i++) {
76 if (uuid_is_null(&xfs_uuid_table[i])) {
77 hole = i;
78 continue;
79 }
80 if (uuid_equal(uuid, &xfs_uuid_table[i]))
81 goto out_duplicate;
82 }
83
84 if (hole < 0) {
85 xfs_uuid_table = krealloc(xfs_uuid_table,
86 (xfs_uuid_table_size + 1) * sizeof(*xfs_uuid_table),
87 GFP_KERNEL | __GFP_NOFAIL);
88 hole = xfs_uuid_table_size++;
89 }
90 xfs_uuid_table[hole] = *uuid;
91 mutex_unlock(&xfs_uuid_table_mutex);
92
93 return 0;
94
95 out_duplicate:
96 mutex_unlock(&xfs_uuid_table_mutex);
97 xfs_warn(mp, "Filesystem has duplicate UUID %pU - can't mount", uuid);
98 return -EINVAL;
99}
100
101STATIC void
102xfs_uuid_unmount(
103 struct xfs_mount *mp)
104{
105 uuid_t *uuid = &mp->m_sb.sb_uuid;
106 int i;
107
108 if (xfs_has_nouuid(mp))
109 return;
110
111 mutex_lock(&xfs_uuid_table_mutex);
112 for (i = 0; i < xfs_uuid_table_size; i++) {
113 if (uuid_is_null(&xfs_uuid_table[i]))
114 continue;
115 if (!uuid_equal(uuid, &xfs_uuid_table[i]))
116 continue;
117 memset(&xfs_uuid_table[i], 0, sizeof(uuid_t));
118 break;
119 }
120 ASSERT(i < xfs_uuid_table_size);
121 mutex_unlock(&xfs_uuid_table_mutex);
122}
123
124/*
125 * Check size of device based on the (data/realtime) block count.
126 * Note: this check is used by the growfs code as well as mount.
127 */
128int
129xfs_sb_validate_fsb_count(
130 xfs_sb_t *sbp,
131 uint64_t nblocks)
132{
133 ASSERT(PAGE_SHIFT >= sbp->sb_blocklog);
134 ASSERT(sbp->sb_blocklog >= BBSHIFT);
135
136 /* Limited by ULONG_MAX of page cache index */
137 if (nblocks >> (PAGE_SHIFT - sbp->sb_blocklog) > ULONG_MAX)
138 return -EFBIG;
139 return 0;
140}
141
142/*
143 * xfs_readsb
144 *
145 * Does the initial read of the superblock.
146 */
147int
148xfs_readsb(
149 struct xfs_mount *mp,
150 int flags)
151{
152 unsigned int sector_size;
153 struct xfs_buf *bp;
154 struct xfs_sb *sbp = &mp->m_sb;
155 int error;
156 int loud = !(flags & XFS_MFSI_QUIET);
157 const struct xfs_buf_ops *buf_ops;
158
159 ASSERT(mp->m_sb_bp == NULL);
160 ASSERT(mp->m_ddev_targp != NULL);
161
162 /*
163 * For the initial read, we must guess at the sector
164 * size based on the block device. It's enough to
165 * get the sb_sectsize out of the superblock and
166 * then reread with the proper length.
167 * We don't verify it yet, because it may not be complete.
168 */
169 sector_size = xfs_getsize_buftarg(mp->m_ddev_targp);
170 buf_ops = NULL;
171
172 /*
173 * Allocate a (locked) buffer to hold the superblock. This will be kept
174 * around at all times to optimize access to the superblock. Therefore,
175 * set XBF_NO_IOACCT to make sure it doesn't hold the buftarg count
176 * elevated.
177 */
178reread:
179 error = xfs_buf_read_uncached(mp->m_ddev_targp, XFS_SB_DADDR,
180 BTOBB(sector_size), XBF_NO_IOACCT, &bp,
181 buf_ops);
182 if (error) {
183 if (loud)
184 xfs_warn(mp, "SB validate failed with error %d.", error);
185 /* bad CRC means corrupted metadata */
186 if (error == -EFSBADCRC)
187 error = -EFSCORRUPTED;
188 return error;
189 }
190
191 /*
192 * Initialize the mount structure from the superblock.
193 */
194 xfs_sb_from_disk(sbp, bp->b_addr);
195
196 /*
197 * If we haven't validated the superblock, do so now before we try
198 * to check the sector size and reread the superblock appropriately.
199 */
200 if (sbp->sb_magicnum != XFS_SB_MAGIC) {
201 if (loud)
202 xfs_warn(mp, "Invalid superblock magic number");
203 error = -EINVAL;
204 goto release_buf;
205 }
206
207 /*
208 * We must be able to do sector-sized and sector-aligned IO.
209 */
210 if (sector_size > sbp->sb_sectsize) {
211 if (loud)
212 xfs_warn(mp, "device supports %u byte sectors (not %u)",
213 sector_size, sbp->sb_sectsize);
214 error = -ENOSYS;
215 goto release_buf;
216 }
217
218 if (buf_ops == NULL) {
219 /*
220 * Re-read the superblock so the buffer is correctly sized,
221 * and properly verified.
222 */
223 xfs_buf_relse(bp);
224 sector_size = sbp->sb_sectsize;
225 buf_ops = loud ? &xfs_sb_buf_ops : &xfs_sb_quiet_buf_ops;
226 goto reread;
227 }
228
229 mp->m_features |= xfs_sb_version_to_features(sbp);
230 xfs_reinit_percpu_counters(mp);
231
232 /* no need to be quiet anymore, so reset the buf ops */
233 bp->b_ops = &xfs_sb_buf_ops;
234
235 mp->m_sb_bp = bp;
236 xfs_buf_unlock(bp);
237 return 0;
238
239release_buf:
240 xfs_buf_relse(bp);
241 return error;
242}
243
244/*
245 * If the sunit/swidth change would move the precomputed root inode value, we
246 * must reject the ondisk change because repair will stumble over that.
247 * However, we allow the mount to proceed because we never rejected this
248 * combination before. Returns true to update the sb, false otherwise.
249 */
250static inline int
251xfs_check_new_dalign(
252 struct xfs_mount *mp,
253 int new_dalign,
254 bool *update_sb)
255{
256 struct xfs_sb *sbp = &mp->m_sb;
257 xfs_ino_t calc_ino;
258
259 calc_ino = xfs_ialloc_calc_rootino(mp, new_dalign);
260 trace_xfs_check_new_dalign(mp, new_dalign, calc_ino);
261
262 if (sbp->sb_rootino == calc_ino) {
263 *update_sb = true;
264 return 0;
265 }
266
267 xfs_warn(mp,
268"Cannot change stripe alignment; would require moving root inode.");
269
270 /*
271 * XXX: Next time we add a new incompat feature, this should start
272 * returning -EINVAL to fail the mount. Until then, spit out a warning
273 * that we're ignoring the administrator's instructions.
274 */
275 xfs_warn(mp, "Skipping superblock stripe alignment update.");
276 *update_sb = false;
277 return 0;
278}
279
280/*
281 * If we were provided with new sunit/swidth values as mount options, make sure
282 * that they pass basic alignment and superblock feature checks, and convert
283 * them into the same units (FSB) that everything else expects. This step
284 * /must/ be done before computing the inode geometry.
285 */
286STATIC int
287xfs_validate_new_dalign(
288 struct xfs_mount *mp)
289{
290 if (mp->m_dalign == 0)
291 return 0;
292
293 /*
294 * If stripe unit and stripe width are not multiples
295 * of the fs blocksize turn off alignment.
296 */
297 if ((BBTOB(mp->m_dalign) & mp->m_blockmask) ||
298 (BBTOB(mp->m_swidth) & mp->m_blockmask)) {
299 xfs_warn(mp,
300 "alignment check failed: sunit/swidth vs. blocksize(%d)",
301 mp->m_sb.sb_blocksize);
302 return -EINVAL;
303 }
304
305 /*
306 * Convert the stripe unit and width to FSBs.
307 */
308 mp->m_dalign = XFS_BB_TO_FSBT(mp, mp->m_dalign);
309 if (mp->m_dalign && (mp->m_sb.sb_agblocks % mp->m_dalign)) {
310 xfs_warn(mp,
311 "alignment check failed: sunit/swidth vs. agsize(%d)",
312 mp->m_sb.sb_agblocks);
313 return -EINVAL;
314 }
315
316 if (!mp->m_dalign) {
317 xfs_warn(mp,
318 "alignment check failed: sunit(%d) less than bsize(%d)",
319 mp->m_dalign, mp->m_sb.sb_blocksize);
320 return -EINVAL;
321 }
322
323 mp->m_swidth = XFS_BB_TO_FSBT(mp, mp->m_swidth);
324
325 if (!xfs_has_dalign(mp)) {
326 xfs_warn(mp,
327"cannot change alignment: superblock does not support data alignment");
328 return -EINVAL;
329 }
330
331 return 0;
332}
333
334/* Update alignment values based on mount options and sb values. */
335STATIC int
336xfs_update_alignment(
337 struct xfs_mount *mp)
338{
339 struct xfs_sb *sbp = &mp->m_sb;
340
341 if (mp->m_dalign) {
342 bool update_sb;
343 int error;
344
345 if (sbp->sb_unit == mp->m_dalign &&
346 sbp->sb_width == mp->m_swidth)
347 return 0;
348
349 error = xfs_check_new_dalign(mp, mp->m_dalign, &update_sb);
350 if (error || !update_sb)
351 return error;
352
353 sbp->sb_unit = mp->m_dalign;
354 sbp->sb_width = mp->m_swidth;
355 mp->m_update_sb = true;
356 } else if (!xfs_has_noalign(mp) && xfs_has_dalign(mp)) {
357 mp->m_dalign = sbp->sb_unit;
358 mp->m_swidth = sbp->sb_width;
359 }
360
361 return 0;
362}
363
364/*
365 * precalculate the low space thresholds for dynamic speculative preallocation.
366 */
367void
368xfs_set_low_space_thresholds(
369 struct xfs_mount *mp)
370{
371 uint64_t dblocks = mp->m_sb.sb_dblocks;
372 uint64_t rtexts = mp->m_sb.sb_rextents;
373 int i;
374
375 do_div(dblocks, 100);
376 do_div(rtexts, 100);
377
378 for (i = 0; i < XFS_LOWSP_MAX; i++) {
379 mp->m_low_space[i] = dblocks * (i + 1);
380 mp->m_low_rtexts[i] = rtexts * (i + 1);
381 }
382}
383
384/*
385 * Check that the data (and log if separate) is an ok size.
386 */
387STATIC int
388xfs_check_sizes(
389 struct xfs_mount *mp)
390{
391 struct xfs_buf *bp;
392 xfs_daddr_t d;
393 int error;
394
395 d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks);
396 if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_dblocks) {
397 xfs_warn(mp, "filesystem size mismatch detected");
398 return -EFBIG;
399 }
400 error = xfs_buf_read_uncached(mp->m_ddev_targp,
401 d - XFS_FSS_TO_BB(mp, 1),
402 XFS_FSS_TO_BB(mp, 1), 0, &bp, NULL);
403 if (error) {
404 xfs_warn(mp, "last sector read failed");
405 return error;
406 }
407 xfs_buf_relse(bp);
408
409 if (mp->m_logdev_targp == mp->m_ddev_targp)
410 return 0;
411
412 d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks);
413 if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_logblocks) {
414 xfs_warn(mp, "log size mismatch detected");
415 return -EFBIG;
416 }
417 error = xfs_buf_read_uncached(mp->m_logdev_targp,
418 d - XFS_FSB_TO_BB(mp, 1),
419 XFS_FSB_TO_BB(mp, 1), 0, &bp, NULL);
420 if (error) {
421 xfs_warn(mp, "log device read failed");
422 return error;
423 }
424 xfs_buf_relse(bp);
425 return 0;
426}
427
428/*
429 * Clear the quotaflags in memory and in the superblock.
430 */
431int
432xfs_mount_reset_sbqflags(
433 struct xfs_mount *mp)
434{
435 mp->m_qflags = 0;
436
437 /* It is OK to look at sb_qflags in the mount path without m_sb_lock. */
438 if (mp->m_sb.sb_qflags == 0)
439 return 0;
440 spin_lock(&mp->m_sb_lock);
441 mp->m_sb.sb_qflags = 0;
442 spin_unlock(&mp->m_sb_lock);
443
444 if (!xfs_fs_writable(mp, SB_FREEZE_WRITE))
445 return 0;
446
447 return xfs_sync_sb(mp, false);
448}
449
450uint64_t
451xfs_default_resblks(xfs_mount_t *mp)
452{
453 uint64_t resblks;
454
455 /*
456 * We default to 5% or 8192 fsbs of space reserved, whichever is
457 * smaller. This is intended to cover concurrent allocation
458 * transactions when we initially hit enospc. These each require a 4
459 * block reservation. Hence by default we cover roughly 2000 concurrent
460 * allocation reservations.
461 */
462 resblks = mp->m_sb.sb_dblocks;
463 do_div(resblks, 20);
464 resblks = min_t(uint64_t, resblks, 8192);
465 return resblks;
466}
467
468/* Ensure the summary counts are correct. */
469STATIC int
470xfs_check_summary_counts(
471 struct xfs_mount *mp)
472{
473 int error = 0;
474
475 /*
476 * The AG0 superblock verifier rejects in-progress filesystems,
477 * so we should never see the flag set this far into mounting.
478 */
479 if (mp->m_sb.sb_inprogress) {
480 xfs_err(mp, "sb_inprogress set after log recovery??");
481 WARN_ON(1);
482 return -EFSCORRUPTED;
483 }
484
485 /*
486 * Now the log is mounted, we know if it was an unclean shutdown or
487 * not. If it was, with the first phase of recovery has completed, we
488 * have consistent AG blocks on disk. We have not recovered EFIs yet,
489 * but they are recovered transactionally in the second recovery phase
490 * later.
491 *
492 * If the log was clean when we mounted, we can check the summary
493 * counters. If any of them are obviously incorrect, we can recompute
494 * them from the AGF headers in the next step.
495 */
496 if (xfs_is_clean(mp) &&
497 (mp->m_sb.sb_fdblocks > mp->m_sb.sb_dblocks ||
498 !xfs_verify_icount(mp, mp->m_sb.sb_icount) ||
499 mp->m_sb.sb_ifree > mp->m_sb.sb_icount))
500 xfs_fs_mark_sick(mp, XFS_SICK_FS_COUNTERS);
501
502 /*
503 * We can safely re-initialise incore superblock counters from the
504 * per-ag data. These may not be correct if the filesystem was not
505 * cleanly unmounted, so we waited for recovery to finish before doing
506 * this.
507 *
508 * If the filesystem was cleanly unmounted or the previous check did
509 * not flag anything weird, then we can trust the values in the
510 * superblock to be correct and we don't need to do anything here.
511 * Otherwise, recalculate the summary counters.
512 */
513 if ((xfs_has_lazysbcount(mp) && !xfs_is_clean(mp)) ||
514 xfs_fs_has_sickness(mp, XFS_SICK_FS_COUNTERS)) {
515 error = xfs_initialize_perag_data(mp, mp->m_sb.sb_agcount);
516 if (error)
517 return error;
518 }
519
520 /*
521 * Older kernels misused sb_frextents to reflect both incore
522 * reservations made by running transactions and the actual count of
523 * free rt extents in the ondisk metadata. Transactions committed
524 * during runtime can therefore contain a superblock update that
525 * undercounts the number of free rt extents tracked in the rt bitmap.
526 * A clean unmount record will have the correct frextents value since
527 * there can be no other transactions running at that point.
528 *
529 * If we're mounting the rt volume after recovering the log, recompute
530 * frextents from the rtbitmap file to fix the inconsistency.
531 */
532 if (xfs_has_realtime(mp) && !xfs_is_clean(mp)) {
533 error = xfs_rtalloc_reinit_frextents(mp);
534 if (error)
535 return error;
536 }
537
538 return 0;
539}
540
541static void
542xfs_unmount_check(
543 struct xfs_mount *mp)
544{
545 if (xfs_is_shutdown(mp))
546 return;
547
548 if (percpu_counter_sum(&mp->m_ifree) >
549 percpu_counter_sum(&mp->m_icount)) {
550 xfs_alert(mp, "ifree/icount mismatch at unmount");
551 xfs_fs_mark_sick(mp, XFS_SICK_FS_COUNTERS);
552 }
553}
554
555/*
556 * Flush and reclaim dirty inodes in preparation for unmount. Inodes and
557 * internal inode structures can be sitting in the CIL and AIL at this point,
558 * so we need to unpin them, write them back and/or reclaim them before unmount
559 * can proceed. In other words, callers are required to have inactivated all
560 * inodes.
561 *
562 * An inode cluster that has been freed can have its buffer still pinned in
563 * memory because the transaction is still sitting in a iclog. The stale inodes
564 * on that buffer will be pinned to the buffer until the transaction hits the
565 * disk and the callbacks run. Pushing the AIL will skip the stale inodes and
566 * may never see the pinned buffer, so nothing will push out the iclog and
567 * unpin the buffer.
568 *
569 * Hence we need to force the log to unpin everything first. However, log
570 * forces don't wait for the discards they issue to complete, so we have to
571 * explicitly wait for them to complete here as well.
572 *
573 * Then we can tell the world we are unmounting so that error handling knows
574 * that the filesystem is going away and we should error out anything that we
575 * have been retrying in the background. This will prevent never-ending
576 * retries in AIL pushing from hanging the unmount.
577 *
578 * Finally, we can push the AIL to clean all the remaining dirty objects, then
579 * reclaim the remaining inodes that are still in memory at this point in time.
580 */
581static void
582xfs_unmount_flush_inodes(
583 struct xfs_mount *mp)
584{
585 xfs_log_force(mp, XFS_LOG_SYNC);
586 xfs_extent_busy_wait_all(mp);
587 flush_workqueue(xfs_discard_wq);
588
589 set_bit(XFS_OPSTATE_UNMOUNTING, &mp->m_opstate);
590
591 xfs_ail_push_all_sync(mp->m_ail);
592 xfs_inodegc_stop(mp);
593 cancel_delayed_work_sync(&mp->m_reclaim_work);
594 xfs_reclaim_inodes(mp);
595 xfs_health_unmount(mp);
596}
597
598static void
599xfs_mount_setup_inode_geom(
600 struct xfs_mount *mp)
601{
602 struct xfs_ino_geometry *igeo = M_IGEO(mp);
603
604 igeo->attr_fork_offset = xfs_bmap_compute_attr_offset(mp);
605 ASSERT(igeo->attr_fork_offset < XFS_LITINO(mp));
606
607 xfs_ialloc_setup_geometry(mp);
608}
609
610/* Compute maximum possible height for per-AG btree types for this fs. */
611static inline void
612xfs_agbtree_compute_maxlevels(
613 struct xfs_mount *mp)
614{
615 unsigned int levels;
616
617 levels = max(mp->m_alloc_maxlevels, M_IGEO(mp)->inobt_maxlevels);
618 levels = max(levels, mp->m_rmap_maxlevels);
619 mp->m_agbtree_maxlevels = max(levels, mp->m_refc_maxlevels);
620}
621
622/*
623 * This function does the following on an initial mount of a file system:
624 * - reads the superblock from disk and init the mount struct
625 * - if we're a 32-bit kernel, do a size check on the superblock
626 * so we don't mount terabyte filesystems
627 * - init mount struct realtime fields
628 * - allocate inode hash table for fs
629 * - init directory manager
630 * - perform recovery and init the log manager
631 */
632int
633xfs_mountfs(
634 struct xfs_mount *mp)
635{
636 struct xfs_sb *sbp = &(mp->m_sb);
637 struct xfs_inode *rip;
638 struct xfs_ino_geometry *igeo = M_IGEO(mp);
639 uint64_t resblks;
640 uint quotamount = 0;
641 uint quotaflags = 0;
642 int error = 0;
643
644 xfs_sb_mount_common(mp, sbp);
645
646 /*
647 * Check for a mismatched features2 values. Older kernels read & wrote
648 * into the wrong sb offset for sb_features2 on some platforms due to
649 * xfs_sb_t not being 64bit size aligned when sb_features2 was added,
650 * which made older superblock reading/writing routines swap it as a
651 * 64-bit value.
652 *
653 * For backwards compatibility, we make both slots equal.
654 *
655 * If we detect a mismatched field, we OR the set bits into the existing
656 * features2 field in case it has already been modified; we don't want
657 * to lose any features. We then update the bad location with the ORed
658 * value so that older kernels will see any features2 flags. The
659 * superblock writeback code ensures the new sb_features2 is copied to
660 * sb_bad_features2 before it is logged or written to disk.
661 */
662 if (xfs_sb_has_mismatched_features2(sbp)) {
663 xfs_warn(mp, "correcting sb_features alignment problem");
664 sbp->sb_features2 |= sbp->sb_bad_features2;
665 mp->m_update_sb = true;
666 }
667
668
669 /* always use v2 inodes by default now */
670 if (!(mp->m_sb.sb_versionnum & XFS_SB_VERSION_NLINKBIT)) {
671 mp->m_sb.sb_versionnum |= XFS_SB_VERSION_NLINKBIT;
672 mp->m_features |= XFS_FEAT_NLINK;
673 mp->m_update_sb = true;
674 }
675
676 /*
677 * If we were given new sunit/swidth options, do some basic validation
678 * checks and convert the incore dalign and swidth values to the
679 * same units (FSB) that everything else uses. This /must/ happen
680 * before computing the inode geometry.
681 */
682 error = xfs_validate_new_dalign(mp);
683 if (error)
684 goto out;
685
686 xfs_alloc_compute_maxlevels(mp);
687 xfs_bmap_compute_maxlevels(mp, XFS_DATA_FORK);
688 xfs_bmap_compute_maxlevels(mp, XFS_ATTR_FORK);
689 xfs_mount_setup_inode_geom(mp);
690 xfs_rmapbt_compute_maxlevels(mp);
691 xfs_refcountbt_compute_maxlevels(mp);
692
693 xfs_agbtree_compute_maxlevels(mp);
694
695 /*
696 * Check if sb_agblocks is aligned at stripe boundary. If sb_agblocks
697 * is NOT aligned turn off m_dalign since allocator alignment is within
698 * an ag, therefore ag has to be aligned at stripe boundary. Note that
699 * we must compute the free space and rmap btree geometry before doing
700 * this.
701 */
702 error = xfs_update_alignment(mp);
703 if (error)
704 goto out;
705
706 /* enable fail_at_unmount as default */
707 mp->m_fail_unmount = true;
708
709 error = xfs_sysfs_init(&mp->m_kobj, &xfs_mp_ktype,
710 NULL, mp->m_super->s_id);
711 if (error)
712 goto out;
713
714 error = xfs_sysfs_init(&mp->m_stats.xs_kobj, &xfs_stats_ktype,
715 &mp->m_kobj, "stats");
716 if (error)
717 goto out_remove_sysfs;
718
719 error = xfs_error_sysfs_init(mp);
720 if (error)
721 goto out_del_stats;
722
723 error = xfs_errortag_init(mp);
724 if (error)
725 goto out_remove_error_sysfs;
726
727 error = xfs_uuid_mount(mp);
728 if (error)
729 goto out_remove_errortag;
730
731 /*
732 * Update the preferred write size based on the information from the
733 * on-disk superblock.
734 */
735 mp->m_allocsize_log =
736 max_t(uint32_t, sbp->sb_blocklog, mp->m_allocsize_log);
737 mp->m_allocsize_blocks = 1U << (mp->m_allocsize_log - sbp->sb_blocklog);
738
739 /* set the low space thresholds for dynamic preallocation */
740 xfs_set_low_space_thresholds(mp);
741
742 /*
743 * If enabled, sparse inode chunk alignment is expected to match the
744 * cluster size. Full inode chunk alignment must match the chunk size,
745 * but that is checked on sb read verification...
746 */
747 if (xfs_has_sparseinodes(mp) &&
748 mp->m_sb.sb_spino_align !=
749 XFS_B_TO_FSBT(mp, igeo->inode_cluster_size_raw)) {
750 xfs_warn(mp,
751 "Sparse inode block alignment (%u) must match cluster size (%llu).",
752 mp->m_sb.sb_spino_align,
753 XFS_B_TO_FSBT(mp, igeo->inode_cluster_size_raw));
754 error = -EINVAL;
755 goto out_remove_uuid;
756 }
757
758 /*
759 * Check that the data (and log if separate) is an ok size.
760 */
761 error = xfs_check_sizes(mp);
762 if (error)
763 goto out_remove_uuid;
764
765 /*
766 * Initialize realtime fields in the mount structure
767 */
768 error = xfs_rtmount_init(mp);
769 if (error) {
770 xfs_warn(mp, "RT mount failed");
771 goto out_remove_uuid;
772 }
773
774 /*
775 * Copies the low order bits of the timestamp and the randomly
776 * set "sequence" number out of a UUID.
777 */
778 mp->m_fixedfsid[0] =
779 (get_unaligned_be16(&sbp->sb_uuid.b[8]) << 16) |
780 get_unaligned_be16(&sbp->sb_uuid.b[4]);
781 mp->m_fixedfsid[1] = get_unaligned_be32(&sbp->sb_uuid.b[0]);
782
783 error = xfs_da_mount(mp);
784 if (error) {
785 xfs_warn(mp, "Failed dir/attr init: %d", error);
786 goto out_remove_uuid;
787 }
788
789 /*
790 * Initialize the precomputed transaction reservations values.
791 */
792 xfs_trans_init(mp);
793
794 /*
795 * Allocate and initialize the per-ag data.
796 */
797 error = xfs_initialize_perag(mp, sbp->sb_agcount, mp->m_sb.sb_dblocks,
798 &mp->m_maxagi);
799 if (error) {
800 xfs_warn(mp, "Failed per-ag init: %d", error);
801 goto out_free_dir;
802 }
803
804 if (XFS_IS_CORRUPT(mp, !sbp->sb_logblocks)) {
805 xfs_warn(mp, "no log defined");
806 error = -EFSCORRUPTED;
807 goto out_free_perag;
808 }
809
810 error = xfs_inodegc_register_shrinker(mp);
811 if (error)
812 goto out_fail_wait;
813
814 /*
815 * Log's mount-time initialization. The first part of recovery can place
816 * some items on the AIL, to be handled when recovery is finished or
817 * cancelled.
818 */
819 error = xfs_log_mount(mp, mp->m_logdev_targp,
820 XFS_FSB_TO_DADDR(mp, sbp->sb_logstart),
821 XFS_FSB_TO_BB(mp, sbp->sb_logblocks));
822 if (error) {
823 xfs_warn(mp, "log mount failed");
824 goto out_inodegc_shrinker;
825 }
826
827 /* Enable background inode inactivation workers. */
828 xfs_inodegc_start(mp);
829 xfs_blockgc_start(mp);
830
831 /*
832 * Now that we've recovered any pending superblock feature bit
833 * additions, we can finish setting up the attr2 behaviour for the
834 * mount. The noattr2 option overrides the superblock flag, so only
835 * check the superblock feature flag if the mount option is not set.
836 */
837 if (xfs_has_noattr2(mp)) {
838 mp->m_features &= ~XFS_FEAT_ATTR2;
839 } else if (!xfs_has_attr2(mp) &&
840 (mp->m_sb.sb_features2 & XFS_SB_VERSION2_ATTR2BIT)) {
841 mp->m_features |= XFS_FEAT_ATTR2;
842 }
843
844 /*
845 * Get and sanity-check the root inode.
846 * Save the pointer to it in the mount structure.
847 */
848 error = xfs_iget(mp, NULL, sbp->sb_rootino, XFS_IGET_UNTRUSTED,
849 XFS_ILOCK_EXCL, &rip);
850 if (error) {
851 xfs_warn(mp,
852 "Failed to read root inode 0x%llx, error %d",
853 sbp->sb_rootino, -error);
854 goto out_log_dealloc;
855 }
856
857 ASSERT(rip != NULL);
858
859 if (XFS_IS_CORRUPT(mp, !S_ISDIR(VFS_I(rip)->i_mode))) {
860 xfs_warn(mp, "corrupted root inode %llu: not a directory",
861 (unsigned long long)rip->i_ino);
862 xfs_iunlock(rip, XFS_ILOCK_EXCL);
863 error = -EFSCORRUPTED;
864 goto out_rele_rip;
865 }
866 mp->m_rootip = rip; /* save it */
867
868 xfs_iunlock(rip, XFS_ILOCK_EXCL);
869
870 /*
871 * Initialize realtime inode pointers in the mount structure
872 */
873 error = xfs_rtmount_inodes(mp);
874 if (error) {
875 /*
876 * Free up the root inode.
877 */
878 xfs_warn(mp, "failed to read RT inodes");
879 goto out_rele_rip;
880 }
881
882 /* Make sure the summary counts are ok. */
883 error = xfs_check_summary_counts(mp);
884 if (error)
885 goto out_rtunmount;
886
887 /*
888 * If this is a read-only mount defer the superblock updates until
889 * the next remount into writeable mode. Otherwise we would never
890 * perform the update e.g. for the root filesystem.
891 */
892 if (mp->m_update_sb && !xfs_is_readonly(mp)) {
893 error = xfs_sync_sb(mp, false);
894 if (error) {
895 xfs_warn(mp, "failed to write sb changes");
896 goto out_rtunmount;
897 }
898 }
899
900 /*
901 * Initialise the XFS quota management subsystem for this mount
902 */
903 if (XFS_IS_QUOTA_ON(mp)) {
904 error = xfs_qm_newmount(mp, "amount, "aflags);
905 if (error)
906 goto out_rtunmount;
907 } else {
908 /*
909 * If a file system had quotas running earlier, but decided to
910 * mount without -o uquota/pquota/gquota options, revoke the
911 * quotachecked license.
912 */
913 if (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT) {
914 xfs_notice(mp, "resetting quota flags");
915 error = xfs_mount_reset_sbqflags(mp);
916 if (error)
917 goto out_rtunmount;
918 }
919 }
920
921 /*
922 * Finish recovering the file system. This part needed to be delayed
923 * until after the root and real-time bitmap inodes were consistently
924 * read in. Temporarily create per-AG space reservations for metadata
925 * btree shape changes because space freeing transactions (for inode
926 * inactivation) require the per-AG reservation in lieu of reserving
927 * blocks.
928 */
929 error = xfs_fs_reserve_ag_blocks(mp);
930 if (error && error == -ENOSPC)
931 xfs_warn(mp,
932 "ENOSPC reserving per-AG metadata pool, log recovery may fail.");
933 error = xfs_log_mount_finish(mp);
934 xfs_fs_unreserve_ag_blocks(mp);
935 if (error) {
936 xfs_warn(mp, "log mount finish failed");
937 goto out_rtunmount;
938 }
939
940 /*
941 * Now the log is fully replayed, we can transition to full read-only
942 * mode for read-only mounts. This will sync all the metadata and clean
943 * the log so that the recovery we just performed does not have to be
944 * replayed again on the next mount.
945 *
946 * We use the same quiesce mechanism as the rw->ro remount, as they are
947 * semantically identical operations.
948 */
949 if (xfs_is_readonly(mp) && !xfs_has_norecovery(mp))
950 xfs_log_clean(mp);
951
952 /*
953 * Complete the quota initialisation, post-log-replay component.
954 */
955 if (quotamount) {
956 ASSERT(mp->m_qflags == 0);
957 mp->m_qflags = quotaflags;
958
959 xfs_qm_mount_quotas(mp);
960 }
961
962 /*
963 * Now we are mounted, reserve a small amount of unused space for
964 * privileged transactions. This is needed so that transaction
965 * space required for critical operations can dip into this pool
966 * when at ENOSPC. This is needed for operations like create with
967 * attr, unwritten extent conversion at ENOSPC, etc. Data allocations
968 * are not allowed to use this reserved space.
969 *
970 * This may drive us straight to ENOSPC on mount, but that implies
971 * we were already there on the last unmount. Warn if this occurs.
972 */
973 if (!xfs_is_readonly(mp)) {
974 resblks = xfs_default_resblks(mp);
975 error = xfs_reserve_blocks(mp, &resblks, NULL);
976 if (error)
977 xfs_warn(mp,
978 "Unable to allocate reserve blocks. Continuing without reserve pool.");
979
980 /* Reserve AG blocks for future btree expansion. */
981 error = xfs_fs_reserve_ag_blocks(mp);
982 if (error && error != -ENOSPC)
983 goto out_agresv;
984 }
985
986 return 0;
987
988 out_agresv:
989 xfs_fs_unreserve_ag_blocks(mp);
990 xfs_qm_unmount_quotas(mp);
991 out_rtunmount:
992 xfs_rtunmount_inodes(mp);
993 out_rele_rip:
994 xfs_irele(rip);
995 /* Clean out dquots that might be in memory after quotacheck. */
996 xfs_qm_unmount(mp);
997
998 /*
999 * Inactivate all inodes that might still be in memory after a log
1000 * intent recovery failure so that reclaim can free them. Metadata
1001 * inodes and the root directory shouldn't need inactivation, but the
1002 * mount failed for some reason, so pull down all the state and flee.
1003 */
1004 xfs_inodegc_flush(mp);
1005
1006 /*
1007 * Flush all inode reclamation work and flush the log.
1008 * We have to do this /after/ rtunmount and qm_unmount because those
1009 * two will have scheduled delayed reclaim for the rt/quota inodes.
1010 *
1011 * This is slightly different from the unmountfs call sequence
1012 * because we could be tearing down a partially set up mount. In
1013 * particular, if log_mount_finish fails we bail out without calling
1014 * qm_unmount_quotas and therefore rely on qm_unmount to release the
1015 * quota inodes.
1016 */
1017 xfs_unmount_flush_inodes(mp);
1018 out_log_dealloc:
1019 xfs_log_mount_cancel(mp);
1020 out_inodegc_shrinker:
1021 unregister_shrinker(&mp->m_inodegc_shrinker);
1022 out_fail_wait:
1023 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp)
1024 xfs_buftarg_drain(mp->m_logdev_targp);
1025 xfs_buftarg_drain(mp->m_ddev_targp);
1026 out_free_perag:
1027 xfs_free_perag(mp);
1028 out_free_dir:
1029 xfs_da_unmount(mp);
1030 out_remove_uuid:
1031 xfs_uuid_unmount(mp);
1032 out_remove_errortag:
1033 xfs_errortag_del(mp);
1034 out_remove_error_sysfs:
1035 xfs_error_sysfs_del(mp);
1036 out_del_stats:
1037 xfs_sysfs_del(&mp->m_stats.xs_kobj);
1038 out_remove_sysfs:
1039 xfs_sysfs_del(&mp->m_kobj);
1040 out:
1041 return error;
1042}
1043
1044/*
1045 * This flushes out the inodes,dquots and the superblock, unmounts the
1046 * log and makes sure that incore structures are freed.
1047 */
1048void
1049xfs_unmountfs(
1050 struct xfs_mount *mp)
1051{
1052 uint64_t resblks;
1053 int error;
1054
1055 /*
1056 * Perform all on-disk metadata updates required to inactivate inodes
1057 * that the VFS evicted earlier in the unmount process. Freeing inodes
1058 * and discarding CoW fork preallocations can cause shape changes to
1059 * the free inode and refcount btrees, respectively, so we must finish
1060 * this before we discard the metadata space reservations. Metadata
1061 * inodes and the root directory do not require inactivation.
1062 */
1063 xfs_inodegc_flush(mp);
1064
1065 xfs_blockgc_stop(mp);
1066 xfs_fs_unreserve_ag_blocks(mp);
1067 xfs_qm_unmount_quotas(mp);
1068 xfs_rtunmount_inodes(mp);
1069 xfs_irele(mp->m_rootip);
1070
1071 xfs_unmount_flush_inodes(mp);
1072
1073 xfs_qm_unmount(mp);
1074
1075 /*
1076 * Unreserve any blocks we have so that when we unmount we don't account
1077 * the reserved free space as used. This is really only necessary for
1078 * lazy superblock counting because it trusts the incore superblock
1079 * counters to be absolutely correct on clean unmount.
1080 *
1081 * We don't bother correcting this elsewhere for lazy superblock
1082 * counting because on mount of an unclean filesystem we reconstruct the
1083 * correct counter value and this is irrelevant.
1084 *
1085 * For non-lazy counter filesystems, this doesn't matter at all because
1086 * we only every apply deltas to the superblock and hence the incore
1087 * value does not matter....
1088 */
1089 resblks = 0;
1090 error = xfs_reserve_blocks(mp, &resblks, NULL);
1091 if (error)
1092 xfs_warn(mp, "Unable to free reserved block pool. "
1093 "Freespace may not be correct on next mount.");
1094 xfs_unmount_check(mp);
1095
1096 xfs_log_unmount(mp);
1097 xfs_da_unmount(mp);
1098 xfs_uuid_unmount(mp);
1099
1100#if defined(DEBUG)
1101 xfs_errortag_clearall(mp);
1102#endif
1103 unregister_shrinker(&mp->m_inodegc_shrinker);
1104 xfs_free_perag(mp);
1105
1106 xfs_errortag_del(mp);
1107 xfs_error_sysfs_del(mp);
1108 xfs_sysfs_del(&mp->m_stats.xs_kobj);
1109 xfs_sysfs_del(&mp->m_kobj);
1110}
1111
1112/*
1113 * Determine whether modifications can proceed. The caller specifies the minimum
1114 * freeze level for which modifications should not be allowed. This allows
1115 * certain operations to proceed while the freeze sequence is in progress, if
1116 * necessary.
1117 */
1118bool
1119xfs_fs_writable(
1120 struct xfs_mount *mp,
1121 int level)
1122{
1123 ASSERT(level > SB_UNFROZEN);
1124 if ((mp->m_super->s_writers.frozen >= level) ||
1125 xfs_is_shutdown(mp) || xfs_is_readonly(mp))
1126 return false;
1127
1128 return true;
1129}
1130
1131/* Adjust m_fdblocks or m_frextents. */
1132int
1133xfs_mod_freecounter(
1134 struct xfs_mount *mp,
1135 struct percpu_counter *counter,
1136 int64_t delta,
1137 bool rsvd)
1138{
1139 int64_t lcounter;
1140 long long res_used;
1141 uint64_t set_aside = 0;
1142 s32 batch;
1143 bool has_resv_pool;
1144
1145 ASSERT(counter == &mp->m_fdblocks || counter == &mp->m_frextents);
1146 has_resv_pool = (counter == &mp->m_fdblocks);
1147 if (rsvd)
1148 ASSERT(has_resv_pool);
1149
1150 if (delta > 0) {
1151 /*
1152 * If the reserve pool is depleted, put blocks back into it
1153 * first. Most of the time the pool is full.
1154 */
1155 if (likely(!has_resv_pool ||
1156 mp->m_resblks == mp->m_resblks_avail)) {
1157 percpu_counter_add(counter, delta);
1158 return 0;
1159 }
1160
1161 spin_lock(&mp->m_sb_lock);
1162 res_used = (long long)(mp->m_resblks - mp->m_resblks_avail);
1163
1164 if (res_used > delta) {
1165 mp->m_resblks_avail += delta;
1166 } else {
1167 delta -= res_used;
1168 mp->m_resblks_avail = mp->m_resblks;
1169 percpu_counter_add(counter, delta);
1170 }
1171 spin_unlock(&mp->m_sb_lock);
1172 return 0;
1173 }
1174
1175 /*
1176 * Taking blocks away, need to be more accurate the closer we
1177 * are to zero.
1178 *
1179 * If the counter has a value of less than 2 * max batch size,
1180 * then make everything serialise as we are real close to
1181 * ENOSPC.
1182 */
1183 if (__percpu_counter_compare(counter, 2 * XFS_FDBLOCKS_BATCH,
1184 XFS_FDBLOCKS_BATCH) < 0)
1185 batch = 1;
1186 else
1187 batch = XFS_FDBLOCKS_BATCH;
1188
1189 /*
1190 * Set aside allocbt blocks because these blocks are tracked as free
1191 * space but not available for allocation. Technically this means that a
1192 * single reservation cannot consume all remaining free space, but the
1193 * ratio of allocbt blocks to usable free blocks should be rather small.
1194 * The tradeoff without this is that filesystems that maintain high
1195 * perag block reservations can over reserve physical block availability
1196 * and fail physical allocation, which leads to much more serious
1197 * problems (i.e. transaction abort, pagecache discards, etc.) than
1198 * slightly premature -ENOSPC.
1199 */
1200 if (has_resv_pool)
1201 set_aside = xfs_fdblocks_unavailable(mp);
1202 percpu_counter_add_batch(counter, delta, batch);
1203 if (__percpu_counter_compare(counter, set_aside,
1204 XFS_FDBLOCKS_BATCH) >= 0) {
1205 /* we had space! */
1206 return 0;
1207 }
1208
1209 /*
1210 * lock up the sb for dipping into reserves before releasing the space
1211 * that took us to ENOSPC.
1212 */
1213 spin_lock(&mp->m_sb_lock);
1214 percpu_counter_add(counter, -delta);
1215 if (!has_resv_pool || !rsvd)
1216 goto fdblocks_enospc;
1217
1218 lcounter = (long long)mp->m_resblks_avail + delta;
1219 if (lcounter >= 0) {
1220 mp->m_resblks_avail = lcounter;
1221 spin_unlock(&mp->m_sb_lock);
1222 return 0;
1223 }
1224 xfs_warn_once(mp,
1225"Reserve blocks depleted! Consider increasing reserve pool size.");
1226
1227fdblocks_enospc:
1228 spin_unlock(&mp->m_sb_lock);
1229 return -ENOSPC;
1230}
1231
1232/*
1233 * Used to free the superblock along various error paths.
1234 */
1235void
1236xfs_freesb(
1237 struct xfs_mount *mp)
1238{
1239 struct xfs_buf *bp = mp->m_sb_bp;
1240
1241 xfs_buf_lock(bp);
1242 mp->m_sb_bp = NULL;
1243 xfs_buf_relse(bp);
1244}
1245
1246/*
1247 * If the underlying (data/log/rt) device is readonly, there are some
1248 * operations that cannot proceed.
1249 */
1250int
1251xfs_dev_is_read_only(
1252 struct xfs_mount *mp,
1253 char *message)
1254{
1255 if (xfs_readonly_buftarg(mp->m_ddev_targp) ||
1256 xfs_readonly_buftarg(mp->m_logdev_targp) ||
1257 (mp->m_rtdev_targp && xfs_readonly_buftarg(mp->m_rtdev_targp))) {
1258 xfs_notice(mp, "%s required on read-only device.", message);
1259 xfs_notice(mp, "write access unavailable, cannot proceed.");
1260 return -EROFS;
1261 }
1262 return 0;
1263}
1264
1265/* Force the summary counters to be recalculated at next mount. */
1266void
1267xfs_force_summary_recalc(
1268 struct xfs_mount *mp)
1269{
1270 if (!xfs_has_lazysbcount(mp))
1271 return;
1272
1273 xfs_fs_mark_sick(mp, XFS_SICK_FS_COUNTERS);
1274}
1275
1276/*
1277 * Enable a log incompat feature flag in the primary superblock. The caller
1278 * cannot have any other transactions in progress.
1279 */
1280int
1281xfs_add_incompat_log_feature(
1282 struct xfs_mount *mp,
1283 uint32_t feature)
1284{
1285 struct xfs_dsb *dsb;
1286 int error;
1287
1288 ASSERT(hweight32(feature) == 1);
1289 ASSERT(!(feature & XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN));
1290
1291 /*
1292 * Force the log to disk and kick the background AIL thread to reduce
1293 * the chances that the bwrite will stall waiting for the AIL to unpin
1294 * the primary superblock buffer. This isn't a data integrity
1295 * operation, so we don't need a synchronous push.
1296 */
1297 error = xfs_log_force(mp, XFS_LOG_SYNC);
1298 if (error)
1299 return error;
1300 xfs_ail_push_all(mp->m_ail);
1301
1302 /*
1303 * Lock the primary superblock buffer to serialize all callers that
1304 * are trying to set feature bits.
1305 */
1306 xfs_buf_lock(mp->m_sb_bp);
1307 xfs_buf_hold(mp->m_sb_bp);
1308
1309 if (xfs_is_shutdown(mp)) {
1310 error = -EIO;
1311 goto rele;
1312 }
1313
1314 if (xfs_sb_has_incompat_log_feature(&mp->m_sb, feature))
1315 goto rele;
1316
1317 /*
1318 * Write the primary superblock to disk immediately, because we need
1319 * the log_incompat bit to be set in the primary super now to protect
1320 * the log items that we're going to commit later.
1321 */
1322 dsb = mp->m_sb_bp->b_addr;
1323 xfs_sb_to_disk(dsb, &mp->m_sb);
1324 dsb->sb_features_log_incompat |= cpu_to_be32(feature);
1325 error = xfs_bwrite(mp->m_sb_bp);
1326 if (error)
1327 goto shutdown;
1328
1329 /*
1330 * Add the feature bits to the incore superblock before we unlock the
1331 * buffer.
1332 */
1333 xfs_sb_add_incompat_log_features(&mp->m_sb, feature);
1334 xfs_buf_relse(mp->m_sb_bp);
1335
1336 /* Log the superblock to disk. */
1337 return xfs_sync_sb(mp, false);
1338shutdown:
1339 xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR);
1340rele:
1341 xfs_buf_relse(mp->m_sb_bp);
1342 return error;
1343}
1344
1345/*
1346 * Clear all the log incompat flags from the superblock.
1347 *
1348 * The caller cannot be in a transaction, must ensure that the log does not
1349 * contain any log items protected by any log incompat bit, and must ensure
1350 * that there are no other threads that depend on the state of the log incompat
1351 * feature flags in the primary super.
1352 *
1353 * Returns true if the superblock is dirty.
1354 */
1355bool
1356xfs_clear_incompat_log_features(
1357 struct xfs_mount *mp)
1358{
1359 bool ret = false;
1360
1361 if (!xfs_has_crc(mp) ||
1362 !xfs_sb_has_incompat_log_feature(&mp->m_sb,
1363 XFS_SB_FEAT_INCOMPAT_LOG_ALL) ||
1364 xfs_is_shutdown(mp))
1365 return false;
1366
1367 /*
1368 * Update the incore superblock. We synchronize on the primary super
1369 * buffer lock to be consistent with the add function, though at least
1370 * in theory this shouldn't be necessary.
1371 */
1372 xfs_buf_lock(mp->m_sb_bp);
1373 xfs_buf_hold(mp->m_sb_bp);
1374
1375 if (xfs_sb_has_incompat_log_feature(&mp->m_sb,
1376 XFS_SB_FEAT_INCOMPAT_LOG_ALL)) {
1377 xfs_sb_remove_incompat_log_features(&mp->m_sb);
1378 ret = true;
1379 }
1380
1381 xfs_buf_relse(mp->m_sb_bp);
1382 return ret;
1383}
1384
1385/*
1386 * Update the in-core delayed block counter.
1387 *
1388 * We prefer to update the counter without having to take a spinlock for every
1389 * counter update (i.e. batching). Each change to delayed allocation
1390 * reservations can change can easily exceed the default percpu counter
1391 * batching, so we use a larger batch factor here.
1392 *
1393 * Note that we don't currently have any callers requiring fast summation
1394 * (e.g. percpu_counter_read) so we can use a big batch value here.
1395 */
1396#define XFS_DELALLOC_BATCH (4096)
1397void
1398xfs_mod_delalloc(
1399 struct xfs_mount *mp,
1400 int64_t delta)
1401{
1402 percpu_counter_add_batch(&mp->m_delalloc_blks, delta,
1403 XFS_DELALLOC_BATCH);
1404}
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_shared.h"
21#include "xfs_format.h"
22#include "xfs_log_format.h"
23#include "xfs_trans_resv.h"
24#include "xfs_bit.h"
25#include "xfs_sb.h"
26#include "xfs_mount.h"
27#include "xfs_defer.h"
28#include "xfs_da_format.h"
29#include "xfs_da_btree.h"
30#include "xfs_inode.h"
31#include "xfs_dir2.h"
32#include "xfs_ialloc.h"
33#include "xfs_alloc.h"
34#include "xfs_rtalloc.h"
35#include "xfs_bmap.h"
36#include "xfs_trans.h"
37#include "xfs_trans_priv.h"
38#include "xfs_log.h"
39#include "xfs_error.h"
40#include "xfs_quota.h"
41#include "xfs_fsops.h"
42#include "xfs_trace.h"
43#include "xfs_icache.h"
44#include "xfs_sysfs.h"
45#include "xfs_rmap_btree.h"
46#include "xfs_refcount_btree.h"
47#include "xfs_reflink.h"
48
49
50static DEFINE_MUTEX(xfs_uuid_table_mutex);
51static int xfs_uuid_table_size;
52static uuid_t *xfs_uuid_table;
53
54void
55xfs_uuid_table_free(void)
56{
57 if (xfs_uuid_table_size == 0)
58 return;
59 kmem_free(xfs_uuid_table);
60 xfs_uuid_table = NULL;
61 xfs_uuid_table_size = 0;
62}
63
64/*
65 * See if the UUID is unique among mounted XFS filesystems.
66 * Mount fails if UUID is nil or a FS with the same UUID is already mounted.
67 */
68STATIC int
69xfs_uuid_mount(
70 struct xfs_mount *mp)
71{
72 uuid_t *uuid = &mp->m_sb.sb_uuid;
73 int hole, i;
74
75 if (mp->m_flags & XFS_MOUNT_NOUUID)
76 return 0;
77
78 if (uuid_is_nil(uuid)) {
79 xfs_warn(mp, "Filesystem has nil UUID - can't mount");
80 return -EINVAL;
81 }
82
83 mutex_lock(&xfs_uuid_table_mutex);
84 for (i = 0, hole = -1; i < xfs_uuid_table_size; i++) {
85 if (uuid_is_nil(&xfs_uuid_table[i])) {
86 hole = i;
87 continue;
88 }
89 if (uuid_equal(uuid, &xfs_uuid_table[i]))
90 goto out_duplicate;
91 }
92
93 if (hole < 0) {
94 xfs_uuid_table = kmem_realloc(xfs_uuid_table,
95 (xfs_uuid_table_size + 1) * sizeof(*xfs_uuid_table),
96 KM_SLEEP);
97 hole = xfs_uuid_table_size++;
98 }
99 xfs_uuid_table[hole] = *uuid;
100 mutex_unlock(&xfs_uuid_table_mutex);
101
102 return 0;
103
104 out_duplicate:
105 mutex_unlock(&xfs_uuid_table_mutex);
106 xfs_warn(mp, "Filesystem has duplicate UUID %pU - can't mount", uuid);
107 return -EINVAL;
108}
109
110STATIC void
111xfs_uuid_unmount(
112 struct xfs_mount *mp)
113{
114 uuid_t *uuid = &mp->m_sb.sb_uuid;
115 int i;
116
117 if (mp->m_flags & XFS_MOUNT_NOUUID)
118 return;
119
120 mutex_lock(&xfs_uuid_table_mutex);
121 for (i = 0; i < xfs_uuid_table_size; i++) {
122 if (uuid_is_nil(&xfs_uuid_table[i]))
123 continue;
124 if (!uuid_equal(uuid, &xfs_uuid_table[i]))
125 continue;
126 memset(&xfs_uuid_table[i], 0, sizeof(uuid_t));
127 break;
128 }
129 ASSERT(i < xfs_uuid_table_size);
130 mutex_unlock(&xfs_uuid_table_mutex);
131}
132
133
134STATIC void
135__xfs_free_perag(
136 struct rcu_head *head)
137{
138 struct xfs_perag *pag = container_of(head, struct xfs_perag, rcu_head);
139
140 ASSERT(atomic_read(&pag->pag_ref) == 0);
141 kmem_free(pag);
142}
143
144/*
145 * Free up the per-ag resources associated with the mount structure.
146 */
147STATIC void
148xfs_free_perag(
149 xfs_mount_t *mp)
150{
151 xfs_agnumber_t agno;
152 struct xfs_perag *pag;
153
154 for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) {
155 spin_lock(&mp->m_perag_lock);
156 pag = radix_tree_delete(&mp->m_perag_tree, agno);
157 spin_unlock(&mp->m_perag_lock);
158 ASSERT(pag);
159 ASSERT(atomic_read(&pag->pag_ref) == 0);
160 xfs_buf_hash_destroy(pag);
161 call_rcu(&pag->rcu_head, __xfs_free_perag);
162 }
163}
164
165/*
166 * Check size of device based on the (data/realtime) block count.
167 * Note: this check is used by the growfs code as well as mount.
168 */
169int
170xfs_sb_validate_fsb_count(
171 xfs_sb_t *sbp,
172 __uint64_t nblocks)
173{
174 ASSERT(PAGE_SHIFT >= sbp->sb_blocklog);
175 ASSERT(sbp->sb_blocklog >= BBSHIFT);
176
177 /* Limited by ULONG_MAX of page cache index */
178 if (nblocks >> (PAGE_SHIFT - sbp->sb_blocklog) > ULONG_MAX)
179 return -EFBIG;
180 return 0;
181}
182
183int
184xfs_initialize_perag(
185 xfs_mount_t *mp,
186 xfs_agnumber_t agcount,
187 xfs_agnumber_t *maxagi)
188{
189 xfs_agnumber_t index;
190 xfs_agnumber_t first_initialised = NULLAGNUMBER;
191 xfs_perag_t *pag;
192 int error = -ENOMEM;
193
194 /*
195 * Walk the current per-ag tree so we don't try to initialise AGs
196 * that already exist (growfs case). Allocate and insert all the
197 * AGs we don't find ready for initialisation.
198 */
199 for (index = 0; index < agcount; index++) {
200 pag = xfs_perag_get(mp, index);
201 if (pag) {
202 xfs_perag_put(pag);
203 continue;
204 }
205
206 pag = kmem_zalloc(sizeof(*pag), KM_MAYFAIL);
207 if (!pag)
208 goto out_unwind_new_pags;
209 pag->pag_agno = index;
210 pag->pag_mount = mp;
211 spin_lock_init(&pag->pag_ici_lock);
212 mutex_init(&pag->pag_ici_reclaim_lock);
213 INIT_RADIX_TREE(&pag->pag_ici_root, GFP_ATOMIC);
214 if (xfs_buf_hash_init(pag))
215 goto out_free_pag;
216
217 if (radix_tree_preload(GFP_NOFS))
218 goto out_hash_destroy;
219
220 spin_lock(&mp->m_perag_lock);
221 if (radix_tree_insert(&mp->m_perag_tree, index, pag)) {
222 BUG();
223 spin_unlock(&mp->m_perag_lock);
224 radix_tree_preload_end();
225 error = -EEXIST;
226 goto out_hash_destroy;
227 }
228 spin_unlock(&mp->m_perag_lock);
229 radix_tree_preload_end();
230 /* first new pag is fully initialized */
231 if (first_initialised == NULLAGNUMBER)
232 first_initialised = index;
233 }
234
235 index = xfs_set_inode_alloc(mp, agcount);
236
237 if (maxagi)
238 *maxagi = index;
239
240 mp->m_ag_prealloc_blocks = xfs_prealloc_blocks(mp);
241 return 0;
242
243out_hash_destroy:
244 xfs_buf_hash_destroy(pag);
245out_free_pag:
246 kmem_free(pag);
247out_unwind_new_pags:
248 /* unwind any prior newly initialized pags */
249 for (index = first_initialised; index < agcount; index++) {
250 pag = radix_tree_delete(&mp->m_perag_tree, index);
251 if (!pag)
252 break;
253 xfs_buf_hash_destroy(pag);
254 kmem_free(pag);
255 }
256 return error;
257}
258
259/*
260 * xfs_readsb
261 *
262 * Does the initial read of the superblock.
263 */
264int
265xfs_readsb(
266 struct xfs_mount *mp,
267 int flags)
268{
269 unsigned int sector_size;
270 struct xfs_buf *bp;
271 struct xfs_sb *sbp = &mp->m_sb;
272 int error;
273 int loud = !(flags & XFS_MFSI_QUIET);
274 const struct xfs_buf_ops *buf_ops;
275
276 ASSERT(mp->m_sb_bp == NULL);
277 ASSERT(mp->m_ddev_targp != NULL);
278
279 /*
280 * For the initial read, we must guess at the sector
281 * size based on the block device. It's enough to
282 * get the sb_sectsize out of the superblock and
283 * then reread with the proper length.
284 * We don't verify it yet, because it may not be complete.
285 */
286 sector_size = xfs_getsize_buftarg(mp->m_ddev_targp);
287 buf_ops = NULL;
288
289 /*
290 * Allocate a (locked) buffer to hold the superblock. This will be kept
291 * around at all times to optimize access to the superblock. Therefore,
292 * set XBF_NO_IOACCT to make sure it doesn't hold the buftarg count
293 * elevated.
294 */
295reread:
296 error = xfs_buf_read_uncached(mp->m_ddev_targp, XFS_SB_DADDR,
297 BTOBB(sector_size), XBF_NO_IOACCT, &bp,
298 buf_ops);
299 if (error) {
300 if (loud)
301 xfs_warn(mp, "SB validate failed with error %d.", error);
302 /* bad CRC means corrupted metadata */
303 if (error == -EFSBADCRC)
304 error = -EFSCORRUPTED;
305 return error;
306 }
307
308 /*
309 * Initialize the mount structure from the superblock.
310 */
311 xfs_sb_from_disk(sbp, XFS_BUF_TO_SBP(bp));
312
313 /*
314 * If we haven't validated the superblock, do so now before we try
315 * to check the sector size and reread the superblock appropriately.
316 */
317 if (sbp->sb_magicnum != XFS_SB_MAGIC) {
318 if (loud)
319 xfs_warn(mp, "Invalid superblock magic number");
320 error = -EINVAL;
321 goto release_buf;
322 }
323
324 /*
325 * We must be able to do sector-sized and sector-aligned IO.
326 */
327 if (sector_size > sbp->sb_sectsize) {
328 if (loud)
329 xfs_warn(mp, "device supports %u byte sectors (not %u)",
330 sector_size, sbp->sb_sectsize);
331 error = -ENOSYS;
332 goto release_buf;
333 }
334
335 if (buf_ops == NULL) {
336 /*
337 * Re-read the superblock so the buffer is correctly sized,
338 * and properly verified.
339 */
340 xfs_buf_relse(bp);
341 sector_size = sbp->sb_sectsize;
342 buf_ops = loud ? &xfs_sb_buf_ops : &xfs_sb_quiet_buf_ops;
343 goto reread;
344 }
345
346 xfs_reinit_percpu_counters(mp);
347
348 /* no need to be quiet anymore, so reset the buf ops */
349 bp->b_ops = &xfs_sb_buf_ops;
350
351 mp->m_sb_bp = bp;
352 xfs_buf_unlock(bp);
353 return 0;
354
355release_buf:
356 xfs_buf_relse(bp);
357 return error;
358}
359
360/*
361 * Update alignment values based on mount options and sb values
362 */
363STATIC int
364xfs_update_alignment(xfs_mount_t *mp)
365{
366 xfs_sb_t *sbp = &(mp->m_sb);
367
368 if (mp->m_dalign) {
369 /*
370 * If stripe unit and stripe width are not multiples
371 * of the fs blocksize turn off alignment.
372 */
373 if ((BBTOB(mp->m_dalign) & mp->m_blockmask) ||
374 (BBTOB(mp->m_swidth) & mp->m_blockmask)) {
375 xfs_warn(mp,
376 "alignment check failed: sunit/swidth vs. blocksize(%d)",
377 sbp->sb_blocksize);
378 return -EINVAL;
379 } else {
380 /*
381 * Convert the stripe unit and width to FSBs.
382 */
383 mp->m_dalign = XFS_BB_TO_FSBT(mp, mp->m_dalign);
384 if (mp->m_dalign && (sbp->sb_agblocks % mp->m_dalign)) {
385 xfs_warn(mp,
386 "alignment check failed: sunit/swidth vs. agsize(%d)",
387 sbp->sb_agblocks);
388 return -EINVAL;
389 } else if (mp->m_dalign) {
390 mp->m_swidth = XFS_BB_TO_FSBT(mp, mp->m_swidth);
391 } else {
392 xfs_warn(mp,
393 "alignment check failed: sunit(%d) less than bsize(%d)",
394 mp->m_dalign, sbp->sb_blocksize);
395 return -EINVAL;
396 }
397 }
398
399 /*
400 * Update superblock with new values
401 * and log changes
402 */
403 if (xfs_sb_version_hasdalign(sbp)) {
404 if (sbp->sb_unit != mp->m_dalign) {
405 sbp->sb_unit = mp->m_dalign;
406 mp->m_update_sb = true;
407 }
408 if (sbp->sb_width != mp->m_swidth) {
409 sbp->sb_width = mp->m_swidth;
410 mp->m_update_sb = true;
411 }
412 } else {
413 xfs_warn(mp,
414 "cannot change alignment: superblock does not support data alignment");
415 return -EINVAL;
416 }
417 } else if ((mp->m_flags & XFS_MOUNT_NOALIGN) != XFS_MOUNT_NOALIGN &&
418 xfs_sb_version_hasdalign(&mp->m_sb)) {
419 mp->m_dalign = sbp->sb_unit;
420 mp->m_swidth = sbp->sb_width;
421 }
422
423 return 0;
424}
425
426/*
427 * Set the maximum inode count for this filesystem
428 */
429STATIC void
430xfs_set_maxicount(xfs_mount_t *mp)
431{
432 xfs_sb_t *sbp = &(mp->m_sb);
433 __uint64_t icount;
434
435 if (sbp->sb_imax_pct) {
436 /*
437 * Make sure the maximum inode count is a multiple
438 * of the units we allocate inodes in.
439 */
440 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
441 do_div(icount, 100);
442 do_div(icount, mp->m_ialloc_blks);
443 mp->m_maxicount = (icount * mp->m_ialloc_blks) <<
444 sbp->sb_inopblog;
445 } else {
446 mp->m_maxicount = 0;
447 }
448}
449
450/*
451 * Set the default minimum read and write sizes unless
452 * already specified in a mount option.
453 * We use smaller I/O sizes when the file system
454 * is being used for NFS service (wsync mount option).
455 */
456STATIC void
457xfs_set_rw_sizes(xfs_mount_t *mp)
458{
459 xfs_sb_t *sbp = &(mp->m_sb);
460 int readio_log, writeio_log;
461
462 if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)) {
463 if (mp->m_flags & XFS_MOUNT_WSYNC) {
464 readio_log = XFS_WSYNC_READIO_LOG;
465 writeio_log = XFS_WSYNC_WRITEIO_LOG;
466 } else {
467 readio_log = XFS_READIO_LOG_LARGE;
468 writeio_log = XFS_WRITEIO_LOG_LARGE;
469 }
470 } else {
471 readio_log = mp->m_readio_log;
472 writeio_log = mp->m_writeio_log;
473 }
474
475 if (sbp->sb_blocklog > readio_log) {
476 mp->m_readio_log = sbp->sb_blocklog;
477 } else {
478 mp->m_readio_log = readio_log;
479 }
480 mp->m_readio_blocks = 1 << (mp->m_readio_log - sbp->sb_blocklog);
481 if (sbp->sb_blocklog > writeio_log) {
482 mp->m_writeio_log = sbp->sb_blocklog;
483 } else {
484 mp->m_writeio_log = writeio_log;
485 }
486 mp->m_writeio_blocks = 1 << (mp->m_writeio_log - sbp->sb_blocklog);
487}
488
489/*
490 * precalculate the low space thresholds for dynamic speculative preallocation.
491 */
492void
493xfs_set_low_space_thresholds(
494 struct xfs_mount *mp)
495{
496 int i;
497
498 for (i = 0; i < XFS_LOWSP_MAX; i++) {
499 __uint64_t space = mp->m_sb.sb_dblocks;
500
501 do_div(space, 100);
502 mp->m_low_space[i] = space * (i + 1);
503 }
504}
505
506
507/*
508 * Set whether we're using inode alignment.
509 */
510STATIC void
511xfs_set_inoalignment(xfs_mount_t *mp)
512{
513 if (xfs_sb_version_hasalign(&mp->m_sb) &&
514 mp->m_sb.sb_inoalignmt >= xfs_icluster_size_fsb(mp))
515 mp->m_inoalign_mask = mp->m_sb.sb_inoalignmt - 1;
516 else
517 mp->m_inoalign_mask = 0;
518 /*
519 * If we are using stripe alignment, check whether
520 * the stripe unit is a multiple of the inode alignment
521 */
522 if (mp->m_dalign && mp->m_inoalign_mask &&
523 !(mp->m_dalign & mp->m_inoalign_mask))
524 mp->m_sinoalign = mp->m_dalign;
525 else
526 mp->m_sinoalign = 0;
527}
528
529/*
530 * Check that the data (and log if separate) is an ok size.
531 */
532STATIC int
533xfs_check_sizes(
534 struct xfs_mount *mp)
535{
536 struct xfs_buf *bp;
537 xfs_daddr_t d;
538 int error;
539
540 d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks);
541 if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_dblocks) {
542 xfs_warn(mp, "filesystem size mismatch detected");
543 return -EFBIG;
544 }
545 error = xfs_buf_read_uncached(mp->m_ddev_targp,
546 d - XFS_FSS_TO_BB(mp, 1),
547 XFS_FSS_TO_BB(mp, 1), 0, &bp, NULL);
548 if (error) {
549 xfs_warn(mp, "last sector read failed");
550 return error;
551 }
552 xfs_buf_relse(bp);
553
554 if (mp->m_logdev_targp == mp->m_ddev_targp)
555 return 0;
556
557 d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks);
558 if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_logblocks) {
559 xfs_warn(mp, "log size mismatch detected");
560 return -EFBIG;
561 }
562 error = xfs_buf_read_uncached(mp->m_logdev_targp,
563 d - XFS_FSB_TO_BB(mp, 1),
564 XFS_FSB_TO_BB(mp, 1), 0, &bp, NULL);
565 if (error) {
566 xfs_warn(mp, "log device read failed");
567 return error;
568 }
569 xfs_buf_relse(bp);
570 return 0;
571}
572
573/*
574 * Clear the quotaflags in memory and in the superblock.
575 */
576int
577xfs_mount_reset_sbqflags(
578 struct xfs_mount *mp)
579{
580 mp->m_qflags = 0;
581
582 /* It is OK to look at sb_qflags in the mount path without m_sb_lock. */
583 if (mp->m_sb.sb_qflags == 0)
584 return 0;
585 spin_lock(&mp->m_sb_lock);
586 mp->m_sb.sb_qflags = 0;
587 spin_unlock(&mp->m_sb_lock);
588
589 if (!xfs_fs_writable(mp, SB_FREEZE_WRITE))
590 return 0;
591
592 return xfs_sync_sb(mp, false);
593}
594
595__uint64_t
596xfs_default_resblks(xfs_mount_t *mp)
597{
598 __uint64_t resblks;
599
600 /*
601 * We default to 5% or 8192 fsbs of space reserved, whichever is
602 * smaller. This is intended to cover concurrent allocation
603 * transactions when we initially hit enospc. These each require a 4
604 * block reservation. Hence by default we cover roughly 2000 concurrent
605 * allocation reservations.
606 */
607 resblks = mp->m_sb.sb_dblocks;
608 do_div(resblks, 20);
609 resblks = min_t(__uint64_t, resblks, 8192);
610 return resblks;
611}
612
613/*
614 * This function does the following on an initial mount of a file system:
615 * - reads the superblock from disk and init the mount struct
616 * - if we're a 32-bit kernel, do a size check on the superblock
617 * so we don't mount terabyte filesystems
618 * - init mount struct realtime fields
619 * - allocate inode hash table for fs
620 * - init directory manager
621 * - perform recovery and init the log manager
622 */
623int
624xfs_mountfs(
625 struct xfs_mount *mp)
626{
627 struct xfs_sb *sbp = &(mp->m_sb);
628 struct xfs_inode *rip;
629 __uint64_t resblks;
630 uint quotamount = 0;
631 uint quotaflags = 0;
632 int error = 0;
633
634 xfs_sb_mount_common(mp, sbp);
635
636 /*
637 * Check for a mismatched features2 values. Older kernels read & wrote
638 * into the wrong sb offset for sb_features2 on some platforms due to
639 * xfs_sb_t not being 64bit size aligned when sb_features2 was added,
640 * which made older superblock reading/writing routines swap it as a
641 * 64-bit value.
642 *
643 * For backwards compatibility, we make both slots equal.
644 *
645 * If we detect a mismatched field, we OR the set bits into the existing
646 * features2 field in case it has already been modified; we don't want
647 * to lose any features. We then update the bad location with the ORed
648 * value so that older kernels will see any features2 flags. The
649 * superblock writeback code ensures the new sb_features2 is copied to
650 * sb_bad_features2 before it is logged or written to disk.
651 */
652 if (xfs_sb_has_mismatched_features2(sbp)) {
653 xfs_warn(mp, "correcting sb_features alignment problem");
654 sbp->sb_features2 |= sbp->sb_bad_features2;
655 mp->m_update_sb = true;
656
657 /*
658 * Re-check for ATTR2 in case it was found in bad_features2
659 * slot.
660 */
661 if (xfs_sb_version_hasattr2(&mp->m_sb) &&
662 !(mp->m_flags & XFS_MOUNT_NOATTR2))
663 mp->m_flags |= XFS_MOUNT_ATTR2;
664 }
665
666 if (xfs_sb_version_hasattr2(&mp->m_sb) &&
667 (mp->m_flags & XFS_MOUNT_NOATTR2)) {
668 xfs_sb_version_removeattr2(&mp->m_sb);
669 mp->m_update_sb = true;
670
671 /* update sb_versionnum for the clearing of the morebits */
672 if (!sbp->sb_features2)
673 mp->m_update_sb = true;
674 }
675
676 /* always use v2 inodes by default now */
677 if (!(mp->m_sb.sb_versionnum & XFS_SB_VERSION_NLINKBIT)) {
678 mp->m_sb.sb_versionnum |= XFS_SB_VERSION_NLINKBIT;
679 mp->m_update_sb = true;
680 }
681
682 /*
683 * Check if sb_agblocks is aligned at stripe boundary
684 * If sb_agblocks is NOT aligned turn off m_dalign since
685 * allocator alignment is within an ag, therefore ag has
686 * to be aligned at stripe boundary.
687 */
688 error = xfs_update_alignment(mp);
689 if (error)
690 goto out;
691
692 xfs_alloc_compute_maxlevels(mp);
693 xfs_bmap_compute_maxlevels(mp, XFS_DATA_FORK);
694 xfs_bmap_compute_maxlevels(mp, XFS_ATTR_FORK);
695 xfs_ialloc_compute_maxlevels(mp);
696 xfs_rmapbt_compute_maxlevels(mp);
697 xfs_refcountbt_compute_maxlevels(mp);
698
699 xfs_set_maxicount(mp);
700
701 /* enable fail_at_unmount as default */
702 mp->m_fail_unmount = 1;
703
704 error = xfs_sysfs_init(&mp->m_kobj, &xfs_mp_ktype, NULL, mp->m_fsname);
705 if (error)
706 goto out;
707
708 error = xfs_sysfs_init(&mp->m_stats.xs_kobj, &xfs_stats_ktype,
709 &mp->m_kobj, "stats");
710 if (error)
711 goto out_remove_sysfs;
712
713 error = xfs_error_sysfs_init(mp);
714 if (error)
715 goto out_del_stats;
716
717
718 error = xfs_uuid_mount(mp);
719 if (error)
720 goto out_remove_error_sysfs;
721
722 /*
723 * Set the minimum read and write sizes
724 */
725 xfs_set_rw_sizes(mp);
726
727 /* set the low space thresholds for dynamic preallocation */
728 xfs_set_low_space_thresholds(mp);
729
730 /*
731 * Set the inode cluster size.
732 * This may still be overridden by the file system
733 * block size if it is larger than the chosen cluster size.
734 *
735 * For v5 filesystems, scale the cluster size with the inode size to
736 * keep a constant ratio of inode per cluster buffer, but only if mkfs
737 * has set the inode alignment value appropriately for larger cluster
738 * sizes.
739 */
740 mp->m_inode_cluster_size = XFS_INODE_BIG_CLUSTER_SIZE;
741 if (xfs_sb_version_hascrc(&mp->m_sb)) {
742 int new_size = mp->m_inode_cluster_size;
743
744 new_size *= mp->m_sb.sb_inodesize / XFS_DINODE_MIN_SIZE;
745 if (mp->m_sb.sb_inoalignmt >= XFS_B_TO_FSBT(mp, new_size))
746 mp->m_inode_cluster_size = new_size;
747 }
748
749 /*
750 * If enabled, sparse inode chunk alignment is expected to match the
751 * cluster size. Full inode chunk alignment must match the chunk size,
752 * but that is checked on sb read verification...
753 */
754 if (xfs_sb_version_hassparseinodes(&mp->m_sb) &&
755 mp->m_sb.sb_spino_align !=
756 XFS_B_TO_FSBT(mp, mp->m_inode_cluster_size)) {
757 xfs_warn(mp,
758 "Sparse inode block alignment (%u) must match cluster size (%llu).",
759 mp->m_sb.sb_spino_align,
760 XFS_B_TO_FSBT(mp, mp->m_inode_cluster_size));
761 error = -EINVAL;
762 goto out_remove_uuid;
763 }
764
765 /*
766 * Set inode alignment fields
767 */
768 xfs_set_inoalignment(mp);
769
770 /*
771 * Check that the data (and log if separate) is an ok size.
772 */
773 error = xfs_check_sizes(mp);
774 if (error)
775 goto out_remove_uuid;
776
777 /*
778 * Initialize realtime fields in the mount structure
779 */
780 error = xfs_rtmount_init(mp);
781 if (error) {
782 xfs_warn(mp, "RT mount failed");
783 goto out_remove_uuid;
784 }
785
786 /*
787 * Copies the low order bits of the timestamp and the randomly
788 * set "sequence" number out of a UUID.
789 */
790 uuid_getnodeuniq(&sbp->sb_uuid, mp->m_fixedfsid);
791
792 mp->m_dmevmask = 0; /* not persistent; set after each mount */
793
794 error = xfs_da_mount(mp);
795 if (error) {
796 xfs_warn(mp, "Failed dir/attr init: %d", error);
797 goto out_remove_uuid;
798 }
799
800 /*
801 * Initialize the precomputed transaction reservations values.
802 */
803 xfs_trans_init(mp);
804
805 /*
806 * Allocate and initialize the per-ag data.
807 */
808 spin_lock_init(&mp->m_perag_lock);
809 INIT_RADIX_TREE(&mp->m_perag_tree, GFP_ATOMIC);
810 error = xfs_initialize_perag(mp, sbp->sb_agcount, &mp->m_maxagi);
811 if (error) {
812 xfs_warn(mp, "Failed per-ag init: %d", error);
813 goto out_free_dir;
814 }
815
816 if (!sbp->sb_logblocks) {
817 xfs_warn(mp, "no log defined");
818 XFS_ERROR_REPORT("xfs_mountfs", XFS_ERRLEVEL_LOW, mp);
819 error = -EFSCORRUPTED;
820 goto out_free_perag;
821 }
822
823 /*
824 * Log's mount-time initialization. The first part of recovery can place
825 * some items on the AIL, to be handled when recovery is finished or
826 * cancelled.
827 */
828 error = xfs_log_mount(mp, mp->m_logdev_targp,
829 XFS_FSB_TO_DADDR(mp, sbp->sb_logstart),
830 XFS_FSB_TO_BB(mp, sbp->sb_logblocks));
831 if (error) {
832 xfs_warn(mp, "log mount failed");
833 goto out_fail_wait;
834 }
835
836 /*
837 * Now the log is mounted, we know if it was an unclean shutdown or
838 * not. If it was, with the first phase of recovery has completed, we
839 * have consistent AG blocks on disk. We have not recovered EFIs yet,
840 * but they are recovered transactionally in the second recovery phase
841 * later.
842 *
843 * Hence we can safely re-initialise incore superblock counters from
844 * the per-ag data. These may not be correct if the filesystem was not
845 * cleanly unmounted, so we need to wait for recovery to finish before
846 * doing this.
847 *
848 * If the filesystem was cleanly unmounted, then we can trust the
849 * values in the superblock to be correct and we don't need to do
850 * anything here.
851 *
852 * If we are currently making the filesystem, the initialisation will
853 * fail as the perag data is in an undefined state.
854 */
855 if (xfs_sb_version_haslazysbcount(&mp->m_sb) &&
856 !XFS_LAST_UNMOUNT_WAS_CLEAN(mp) &&
857 !mp->m_sb.sb_inprogress) {
858 error = xfs_initialize_perag_data(mp, sbp->sb_agcount);
859 if (error)
860 goto out_log_dealloc;
861 }
862
863 /*
864 * Get and sanity-check the root inode.
865 * Save the pointer to it in the mount structure.
866 */
867 error = xfs_iget(mp, NULL, sbp->sb_rootino, 0, XFS_ILOCK_EXCL, &rip);
868 if (error) {
869 xfs_warn(mp, "failed to read root inode");
870 goto out_log_dealloc;
871 }
872
873 ASSERT(rip != NULL);
874
875 if (unlikely(!S_ISDIR(VFS_I(rip)->i_mode))) {
876 xfs_warn(mp, "corrupted root inode %llu: not a directory",
877 (unsigned long long)rip->i_ino);
878 xfs_iunlock(rip, XFS_ILOCK_EXCL);
879 XFS_ERROR_REPORT("xfs_mountfs_int(2)", XFS_ERRLEVEL_LOW,
880 mp);
881 error = -EFSCORRUPTED;
882 goto out_rele_rip;
883 }
884 mp->m_rootip = rip; /* save it */
885
886 xfs_iunlock(rip, XFS_ILOCK_EXCL);
887
888 /*
889 * Initialize realtime inode pointers in the mount structure
890 */
891 error = xfs_rtmount_inodes(mp);
892 if (error) {
893 /*
894 * Free up the root inode.
895 */
896 xfs_warn(mp, "failed to read RT inodes");
897 goto out_rele_rip;
898 }
899
900 /*
901 * If this is a read-only mount defer the superblock updates until
902 * the next remount into writeable mode. Otherwise we would never
903 * perform the update e.g. for the root filesystem.
904 */
905 if (mp->m_update_sb && !(mp->m_flags & XFS_MOUNT_RDONLY)) {
906 error = xfs_sync_sb(mp, false);
907 if (error) {
908 xfs_warn(mp, "failed to write sb changes");
909 goto out_rtunmount;
910 }
911 }
912
913 /*
914 * Initialise the XFS quota management subsystem for this mount
915 */
916 if (XFS_IS_QUOTA_RUNNING(mp)) {
917 error = xfs_qm_newmount(mp, "amount, "aflags);
918 if (error)
919 goto out_rtunmount;
920 } else {
921 ASSERT(!XFS_IS_QUOTA_ON(mp));
922
923 /*
924 * If a file system had quotas running earlier, but decided to
925 * mount without -o uquota/pquota/gquota options, revoke the
926 * quotachecked license.
927 */
928 if (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT) {
929 xfs_notice(mp, "resetting quota flags");
930 error = xfs_mount_reset_sbqflags(mp);
931 if (error)
932 goto out_rtunmount;
933 }
934 }
935
936 /*
937 * During the second phase of log recovery, we need iget and
938 * iput to behave like they do for an active filesystem.
939 * xfs_fs_drop_inode needs to be able to prevent the deletion
940 * of inodes before we're done replaying log items on those
941 * inodes.
942 */
943 mp->m_super->s_flags |= MS_ACTIVE;
944
945 /*
946 * Finish recovering the file system. This part needed to be delayed
947 * until after the root and real-time bitmap inodes were consistently
948 * read in.
949 */
950 error = xfs_log_mount_finish(mp);
951 if (error) {
952 xfs_warn(mp, "log mount finish failed");
953 goto out_rtunmount;
954 }
955
956 /*
957 * Now the log is fully replayed, we can transition to full read-only
958 * mode for read-only mounts. This will sync all the metadata and clean
959 * the log so that the recovery we just performed does not have to be
960 * replayed again on the next mount.
961 *
962 * We use the same quiesce mechanism as the rw->ro remount, as they are
963 * semantically identical operations.
964 */
965 if ((mp->m_flags & (XFS_MOUNT_RDONLY|XFS_MOUNT_NORECOVERY)) ==
966 XFS_MOUNT_RDONLY) {
967 xfs_quiesce_attr(mp);
968 }
969
970 /*
971 * Complete the quota initialisation, post-log-replay component.
972 */
973 if (quotamount) {
974 ASSERT(mp->m_qflags == 0);
975 mp->m_qflags = quotaflags;
976
977 xfs_qm_mount_quotas(mp);
978 }
979
980 /*
981 * Now we are mounted, reserve a small amount of unused space for
982 * privileged transactions. This is needed so that transaction
983 * space required for critical operations can dip into this pool
984 * when at ENOSPC. This is needed for operations like create with
985 * attr, unwritten extent conversion at ENOSPC, etc. Data allocations
986 * are not allowed to use this reserved space.
987 *
988 * This may drive us straight to ENOSPC on mount, but that implies
989 * we were already there on the last unmount. Warn if this occurs.
990 */
991 if (!(mp->m_flags & XFS_MOUNT_RDONLY)) {
992 resblks = xfs_default_resblks(mp);
993 error = xfs_reserve_blocks(mp, &resblks, NULL);
994 if (error)
995 xfs_warn(mp,
996 "Unable to allocate reserve blocks. Continuing without reserve pool.");
997
998 /* Recover any CoW blocks that never got remapped. */
999 error = xfs_reflink_recover_cow(mp);
1000 if (error) {
1001 xfs_err(mp,
1002 "Error %d recovering leftover CoW allocations.", error);
1003 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1004 goto out_quota;
1005 }
1006
1007 /* Reserve AG blocks for future btree expansion. */
1008 error = xfs_fs_reserve_ag_blocks(mp);
1009 if (error && error != -ENOSPC)
1010 goto out_agresv;
1011 }
1012
1013 return 0;
1014
1015 out_agresv:
1016 xfs_fs_unreserve_ag_blocks(mp);
1017 out_quota:
1018 xfs_qm_unmount_quotas(mp);
1019 out_rtunmount:
1020 mp->m_super->s_flags &= ~MS_ACTIVE;
1021 xfs_rtunmount_inodes(mp);
1022 out_rele_rip:
1023 IRELE(rip);
1024 cancel_delayed_work_sync(&mp->m_reclaim_work);
1025 xfs_reclaim_inodes(mp, SYNC_WAIT);
1026 out_log_dealloc:
1027 mp->m_flags |= XFS_MOUNT_UNMOUNTING;
1028 xfs_log_mount_cancel(mp);
1029 out_fail_wait:
1030 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp)
1031 xfs_wait_buftarg(mp->m_logdev_targp);
1032 xfs_wait_buftarg(mp->m_ddev_targp);
1033 out_free_perag:
1034 xfs_free_perag(mp);
1035 out_free_dir:
1036 xfs_da_unmount(mp);
1037 out_remove_uuid:
1038 xfs_uuid_unmount(mp);
1039 out_remove_error_sysfs:
1040 xfs_error_sysfs_del(mp);
1041 out_del_stats:
1042 xfs_sysfs_del(&mp->m_stats.xs_kobj);
1043 out_remove_sysfs:
1044 xfs_sysfs_del(&mp->m_kobj);
1045 out:
1046 return error;
1047}
1048
1049/*
1050 * This flushes out the inodes,dquots and the superblock, unmounts the
1051 * log and makes sure that incore structures are freed.
1052 */
1053void
1054xfs_unmountfs(
1055 struct xfs_mount *mp)
1056{
1057 __uint64_t resblks;
1058 int error;
1059
1060 cancel_delayed_work_sync(&mp->m_eofblocks_work);
1061 cancel_delayed_work_sync(&mp->m_cowblocks_work);
1062
1063 xfs_fs_unreserve_ag_blocks(mp);
1064 xfs_qm_unmount_quotas(mp);
1065 xfs_rtunmount_inodes(mp);
1066 IRELE(mp->m_rootip);
1067
1068 /*
1069 * We can potentially deadlock here if we have an inode cluster
1070 * that has been freed has its buffer still pinned in memory because
1071 * the transaction is still sitting in a iclog. The stale inodes
1072 * on that buffer will have their flush locks held until the
1073 * transaction hits the disk and the callbacks run. the inode
1074 * flush takes the flush lock unconditionally and with nothing to
1075 * push out the iclog we will never get that unlocked. hence we
1076 * need to force the log first.
1077 */
1078 xfs_log_force(mp, XFS_LOG_SYNC);
1079
1080 /*
1081 * We now need to tell the world we are unmounting. This will allow
1082 * us to detect that the filesystem is going away and we should error
1083 * out anything that we have been retrying in the background. This will
1084 * prevent neverending retries in AIL pushing from hanging the unmount.
1085 */
1086 mp->m_flags |= XFS_MOUNT_UNMOUNTING;
1087
1088 /*
1089 * Flush all pending changes from the AIL.
1090 */
1091 xfs_ail_push_all_sync(mp->m_ail);
1092
1093 /*
1094 * And reclaim all inodes. At this point there should be no dirty
1095 * inodes and none should be pinned or locked, but use synchronous
1096 * reclaim just to be sure. We can stop background inode reclaim
1097 * here as well if it is still running.
1098 */
1099 cancel_delayed_work_sync(&mp->m_reclaim_work);
1100 xfs_reclaim_inodes(mp, SYNC_WAIT);
1101
1102 xfs_qm_unmount(mp);
1103
1104 /*
1105 * Unreserve any blocks we have so that when we unmount we don't account
1106 * the reserved free space as used. This is really only necessary for
1107 * lazy superblock counting because it trusts the incore superblock
1108 * counters to be absolutely correct on clean unmount.
1109 *
1110 * We don't bother correcting this elsewhere for lazy superblock
1111 * counting because on mount of an unclean filesystem we reconstruct the
1112 * correct counter value and this is irrelevant.
1113 *
1114 * For non-lazy counter filesystems, this doesn't matter at all because
1115 * we only every apply deltas to the superblock and hence the incore
1116 * value does not matter....
1117 */
1118 resblks = 0;
1119 error = xfs_reserve_blocks(mp, &resblks, NULL);
1120 if (error)
1121 xfs_warn(mp, "Unable to free reserved block pool. "
1122 "Freespace may not be correct on next mount.");
1123
1124 error = xfs_log_sbcount(mp);
1125 if (error)
1126 xfs_warn(mp, "Unable to update superblock counters. "
1127 "Freespace may not be correct on next mount.");
1128
1129
1130 xfs_log_unmount(mp);
1131 xfs_da_unmount(mp);
1132 xfs_uuid_unmount(mp);
1133
1134#if defined(DEBUG)
1135 xfs_errortag_clearall(mp, 0);
1136#endif
1137 xfs_free_perag(mp);
1138
1139 xfs_error_sysfs_del(mp);
1140 xfs_sysfs_del(&mp->m_stats.xs_kobj);
1141 xfs_sysfs_del(&mp->m_kobj);
1142}
1143
1144/*
1145 * Determine whether modifications can proceed. The caller specifies the minimum
1146 * freeze level for which modifications should not be allowed. This allows
1147 * certain operations to proceed while the freeze sequence is in progress, if
1148 * necessary.
1149 */
1150bool
1151xfs_fs_writable(
1152 struct xfs_mount *mp,
1153 int level)
1154{
1155 ASSERT(level > SB_UNFROZEN);
1156 if ((mp->m_super->s_writers.frozen >= level) ||
1157 XFS_FORCED_SHUTDOWN(mp) || (mp->m_flags & XFS_MOUNT_RDONLY))
1158 return false;
1159
1160 return true;
1161}
1162
1163/*
1164 * xfs_log_sbcount
1165 *
1166 * Sync the superblock counters to disk.
1167 *
1168 * Note this code can be called during the process of freezing, so we use the
1169 * transaction allocator that does not block when the transaction subsystem is
1170 * in its frozen state.
1171 */
1172int
1173xfs_log_sbcount(xfs_mount_t *mp)
1174{
1175 /* allow this to proceed during the freeze sequence... */
1176 if (!xfs_fs_writable(mp, SB_FREEZE_COMPLETE))
1177 return 0;
1178
1179 /*
1180 * we don't need to do this if we are updating the superblock
1181 * counters on every modification.
1182 */
1183 if (!xfs_sb_version_haslazysbcount(&mp->m_sb))
1184 return 0;
1185
1186 return xfs_sync_sb(mp, true);
1187}
1188
1189/*
1190 * Deltas for the inode count are +/-64, hence we use a large batch size
1191 * of 128 so we don't need to take the counter lock on every update.
1192 */
1193#define XFS_ICOUNT_BATCH 128
1194int
1195xfs_mod_icount(
1196 struct xfs_mount *mp,
1197 int64_t delta)
1198{
1199 __percpu_counter_add(&mp->m_icount, delta, XFS_ICOUNT_BATCH);
1200 if (__percpu_counter_compare(&mp->m_icount, 0, XFS_ICOUNT_BATCH) < 0) {
1201 ASSERT(0);
1202 percpu_counter_add(&mp->m_icount, -delta);
1203 return -EINVAL;
1204 }
1205 return 0;
1206}
1207
1208int
1209xfs_mod_ifree(
1210 struct xfs_mount *mp,
1211 int64_t delta)
1212{
1213 percpu_counter_add(&mp->m_ifree, delta);
1214 if (percpu_counter_compare(&mp->m_ifree, 0) < 0) {
1215 ASSERT(0);
1216 percpu_counter_add(&mp->m_ifree, -delta);
1217 return -EINVAL;
1218 }
1219 return 0;
1220}
1221
1222/*
1223 * Deltas for the block count can vary from 1 to very large, but lock contention
1224 * only occurs on frequent small block count updates such as in the delayed
1225 * allocation path for buffered writes (page a time updates). Hence we set
1226 * a large batch count (1024) to minimise global counter updates except when
1227 * we get near to ENOSPC and we have to be very accurate with our updates.
1228 */
1229#define XFS_FDBLOCKS_BATCH 1024
1230int
1231xfs_mod_fdblocks(
1232 struct xfs_mount *mp,
1233 int64_t delta,
1234 bool rsvd)
1235{
1236 int64_t lcounter;
1237 long long res_used;
1238 s32 batch;
1239
1240 if (delta > 0) {
1241 /*
1242 * If the reserve pool is depleted, put blocks back into it
1243 * first. Most of the time the pool is full.
1244 */
1245 if (likely(mp->m_resblks == mp->m_resblks_avail)) {
1246 percpu_counter_add(&mp->m_fdblocks, delta);
1247 return 0;
1248 }
1249
1250 spin_lock(&mp->m_sb_lock);
1251 res_used = (long long)(mp->m_resblks - mp->m_resblks_avail);
1252
1253 if (res_used > delta) {
1254 mp->m_resblks_avail += delta;
1255 } else {
1256 delta -= res_used;
1257 mp->m_resblks_avail = mp->m_resblks;
1258 percpu_counter_add(&mp->m_fdblocks, delta);
1259 }
1260 spin_unlock(&mp->m_sb_lock);
1261 return 0;
1262 }
1263
1264 /*
1265 * Taking blocks away, need to be more accurate the closer we
1266 * are to zero.
1267 *
1268 * If the counter has a value of less than 2 * max batch size,
1269 * then make everything serialise as we are real close to
1270 * ENOSPC.
1271 */
1272 if (__percpu_counter_compare(&mp->m_fdblocks, 2 * XFS_FDBLOCKS_BATCH,
1273 XFS_FDBLOCKS_BATCH) < 0)
1274 batch = 1;
1275 else
1276 batch = XFS_FDBLOCKS_BATCH;
1277
1278 __percpu_counter_add(&mp->m_fdblocks, delta, batch);
1279 if (__percpu_counter_compare(&mp->m_fdblocks, mp->m_alloc_set_aside,
1280 XFS_FDBLOCKS_BATCH) >= 0) {
1281 /* we had space! */
1282 return 0;
1283 }
1284
1285 /*
1286 * lock up the sb for dipping into reserves before releasing the space
1287 * that took us to ENOSPC.
1288 */
1289 spin_lock(&mp->m_sb_lock);
1290 percpu_counter_add(&mp->m_fdblocks, -delta);
1291 if (!rsvd)
1292 goto fdblocks_enospc;
1293
1294 lcounter = (long long)mp->m_resblks_avail + delta;
1295 if (lcounter >= 0) {
1296 mp->m_resblks_avail = lcounter;
1297 spin_unlock(&mp->m_sb_lock);
1298 return 0;
1299 }
1300 printk_once(KERN_WARNING
1301 "Filesystem \"%s\": reserve blocks depleted! "
1302 "Consider increasing reserve pool size.",
1303 mp->m_fsname);
1304fdblocks_enospc:
1305 spin_unlock(&mp->m_sb_lock);
1306 return -ENOSPC;
1307}
1308
1309int
1310xfs_mod_frextents(
1311 struct xfs_mount *mp,
1312 int64_t delta)
1313{
1314 int64_t lcounter;
1315 int ret = 0;
1316
1317 spin_lock(&mp->m_sb_lock);
1318 lcounter = mp->m_sb.sb_frextents + delta;
1319 if (lcounter < 0)
1320 ret = -ENOSPC;
1321 else
1322 mp->m_sb.sb_frextents = lcounter;
1323 spin_unlock(&mp->m_sb_lock);
1324 return ret;
1325}
1326
1327/*
1328 * xfs_getsb() is called to obtain the buffer for the superblock.
1329 * The buffer is returned locked and read in from disk.
1330 * The buffer should be released with a call to xfs_brelse().
1331 *
1332 * If the flags parameter is BUF_TRYLOCK, then we'll only return
1333 * the superblock buffer if it can be locked without sleeping.
1334 * If it can't then we'll return NULL.
1335 */
1336struct xfs_buf *
1337xfs_getsb(
1338 struct xfs_mount *mp,
1339 int flags)
1340{
1341 struct xfs_buf *bp = mp->m_sb_bp;
1342
1343 if (!xfs_buf_trylock(bp)) {
1344 if (flags & XBF_TRYLOCK)
1345 return NULL;
1346 xfs_buf_lock(bp);
1347 }
1348
1349 xfs_buf_hold(bp);
1350 ASSERT(bp->b_flags & XBF_DONE);
1351 return bp;
1352}
1353
1354/*
1355 * Used to free the superblock along various error paths.
1356 */
1357void
1358xfs_freesb(
1359 struct xfs_mount *mp)
1360{
1361 struct xfs_buf *bp = mp->m_sb_bp;
1362
1363 xfs_buf_lock(bp);
1364 mp->m_sb_bp = NULL;
1365 xfs_buf_relse(bp);
1366}
1367
1368/*
1369 * If the underlying (data/log/rt) device is readonly, there are some
1370 * operations that cannot proceed.
1371 */
1372int
1373xfs_dev_is_read_only(
1374 struct xfs_mount *mp,
1375 char *message)
1376{
1377 if (xfs_readonly_buftarg(mp->m_ddev_targp) ||
1378 xfs_readonly_buftarg(mp->m_logdev_targp) ||
1379 (mp->m_rtdev_targp && xfs_readonly_buftarg(mp->m_rtdev_targp))) {
1380 xfs_notice(mp, "%s required on read-only device.", message);
1381 xfs_notice(mp, "write access unavailable, cannot proceed.");
1382 return -EROFS;
1383 }
1384 return 0;
1385}