1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
8 #include "xfs_shared.h"
9 #include "xfs_format.h"
10 #include "xfs_log_format.h"
11 #include "xfs_trans_resv.h"
14 #include "xfs_mount.h"
15 #include "xfs_inode.h"
17 #include "xfs_ialloc.h"
18 #include "xfs_alloc.h"
19 #include "xfs_rtalloc.h"
21 #include "xfs_trans.h"
22 #include "xfs_trans_priv.h"
24 #include "xfs_error.h"
25 #include "xfs_quota.h"
26 #include "xfs_fsops.h"
27 #include "xfs_icache.h"
28 #include "xfs_sysfs.h"
29 #include "xfs_rmap_btree.h"
30 #include "xfs_refcount_btree.h"
31 #include "xfs_reflink.h"
32 #include "xfs_extent_busy.h"
33 #include "xfs_health.h"
34 #include "xfs_trace.h"
37 static DEFINE_MUTEX(xfs_uuid_table_mutex);
38 static int xfs_uuid_table_size;
39 static uuid_t *xfs_uuid_table;
42 xfs_uuid_table_free(void)
44 if (xfs_uuid_table_size == 0)
46 kmem_free(xfs_uuid_table);
47 xfs_uuid_table = NULL;
48 xfs_uuid_table_size = 0;
52 * See if the UUID is unique among mounted XFS filesystems.
53 * Mount fails if UUID is nil or a FS with the same UUID is already mounted.
59 uuid_t *uuid = &mp->m_sb.sb_uuid;
62 /* Publish UUID in struct super_block */
63 uuid_copy(&mp->m_super->s_uuid, uuid);
65 if (mp->m_flags & XFS_MOUNT_NOUUID)
68 if (uuid_is_null(uuid)) {
69 xfs_warn(mp, "Filesystem has null UUID - can't mount");
73 mutex_lock(&xfs_uuid_table_mutex);
74 for (i = 0, hole = -1; i < xfs_uuid_table_size; i++) {
75 if (uuid_is_null(&xfs_uuid_table[i])) {
79 if (uuid_equal(uuid, &xfs_uuid_table[i]))
84 xfs_uuid_table = krealloc(xfs_uuid_table,
85 (xfs_uuid_table_size + 1) * sizeof(*xfs_uuid_table),
86 GFP_KERNEL | __GFP_NOFAIL);
87 hole = xfs_uuid_table_size++;
89 xfs_uuid_table[hole] = *uuid;
90 mutex_unlock(&xfs_uuid_table_mutex);
95 mutex_unlock(&xfs_uuid_table_mutex);
96 xfs_warn(mp, "Filesystem has duplicate UUID %pU - can't mount", uuid);
102 struct xfs_mount *mp)
104 uuid_t *uuid = &mp->m_sb.sb_uuid;
107 if (mp->m_flags & XFS_MOUNT_NOUUID)
110 mutex_lock(&xfs_uuid_table_mutex);
111 for (i = 0; i < xfs_uuid_table_size; i++) {
112 if (uuid_is_null(&xfs_uuid_table[i]))
114 if (!uuid_equal(uuid, &xfs_uuid_table[i]))
116 memset(&xfs_uuid_table[i], 0, sizeof(uuid_t));
119 ASSERT(i < xfs_uuid_table_size);
120 mutex_unlock(&xfs_uuid_table_mutex);
124 * Check size of device based on the (data/realtime) block count.
125 * Note: this check is used by the growfs code as well as mount.
128 xfs_sb_validate_fsb_count(
132 ASSERT(PAGE_SHIFT >= sbp->sb_blocklog);
133 ASSERT(sbp->sb_blocklog >= BBSHIFT);
135 /* Limited by ULONG_MAX of page cache index */
136 if (nblocks >> (PAGE_SHIFT - sbp->sb_blocklog) > ULONG_MAX)
144 * Does the initial read of the superblock.
148 struct xfs_mount *mp,
151 unsigned int sector_size;
153 struct xfs_sb *sbp = &mp->m_sb;
155 int loud = !(flags & XFS_MFSI_QUIET);
156 const struct xfs_buf_ops *buf_ops;
158 ASSERT(mp->m_sb_bp == NULL);
159 ASSERT(mp->m_ddev_targp != NULL);
162 * For the initial read, we must guess at the sector
163 * size based on the block device. It's enough to
164 * get the sb_sectsize out of the superblock and
165 * then reread with the proper length.
166 * We don't verify it yet, because it may not be complete.
168 sector_size = xfs_getsize_buftarg(mp->m_ddev_targp);
172 * Allocate a (locked) buffer to hold the superblock. This will be kept
173 * around at all times to optimize access to the superblock. Therefore,
174 * set XBF_NO_IOACCT to make sure it doesn't hold the buftarg count
178 error = xfs_buf_read_uncached(mp->m_ddev_targp, XFS_SB_DADDR,
179 BTOBB(sector_size), XBF_NO_IOACCT, &bp,
183 xfs_warn(mp, "SB validate failed with error %d.", error);
184 /* bad CRC means corrupted metadata */
185 if (error == -EFSBADCRC)
186 error = -EFSCORRUPTED;
191 * Initialize the mount structure from the superblock.
193 xfs_sb_from_disk(sbp, bp->b_addr);
196 * If we haven't validated the superblock, do so now before we try
197 * to check the sector size and reread the superblock appropriately.
199 if (sbp->sb_magicnum != XFS_SB_MAGIC) {
201 xfs_warn(mp, "Invalid superblock magic number");
207 * We must be able to do sector-sized and sector-aligned IO.
209 if (sector_size > sbp->sb_sectsize) {
211 xfs_warn(mp, "device supports %u byte sectors (not %u)",
212 sector_size, sbp->sb_sectsize);
217 if (buf_ops == NULL) {
219 * Re-read the superblock so the buffer is correctly sized,
220 * and properly verified.
223 sector_size = sbp->sb_sectsize;
224 buf_ops = loud ? &xfs_sb_buf_ops : &xfs_sb_quiet_buf_ops;
228 xfs_reinit_percpu_counters(mp);
230 /* no need to be quiet anymore, so reset the buf ops */
231 bp->b_ops = &xfs_sb_buf_ops;
243 * If the sunit/swidth change would move the precomputed root inode value, we
244 * must reject the ondisk change because repair will stumble over that.
245 * However, we allow the mount to proceed because we never rejected this
246 * combination before. Returns true to update the sb, false otherwise.
249 xfs_check_new_dalign(
250 struct xfs_mount *mp,
254 struct xfs_sb *sbp = &mp->m_sb;
257 calc_ino = xfs_ialloc_calc_rootino(mp, new_dalign);
258 trace_xfs_check_new_dalign(mp, new_dalign, calc_ino);
260 if (sbp->sb_rootino == calc_ino) {
266 "Cannot change stripe alignment; would require moving root inode.");
269 * XXX: Next time we add a new incompat feature, this should start
270 * returning -EINVAL to fail the mount. Until then, spit out a warning
271 * that we're ignoring the administrator's instructions.
273 xfs_warn(mp, "Skipping superblock stripe alignment update.");
279 * If we were provided with new sunit/swidth values as mount options, make sure
280 * that they pass basic alignment and superblock feature checks, and convert
281 * them into the same units (FSB) that everything else expects. This step
282 * /must/ be done before computing the inode geometry.
285 xfs_validate_new_dalign(
286 struct xfs_mount *mp)
288 if (mp->m_dalign == 0)
292 * If stripe unit and stripe width are not multiples
293 * of the fs blocksize turn off alignment.
295 if ((BBTOB(mp->m_dalign) & mp->m_blockmask) ||
296 (BBTOB(mp->m_swidth) & mp->m_blockmask)) {
298 "alignment check failed: sunit/swidth vs. blocksize(%d)",
299 mp->m_sb.sb_blocksize);
303 * Convert the stripe unit and width to FSBs.
305 mp->m_dalign = XFS_BB_TO_FSBT(mp, mp->m_dalign);
306 if (mp->m_dalign && (mp->m_sb.sb_agblocks % mp->m_dalign)) {
308 "alignment check failed: sunit/swidth vs. agsize(%d)",
309 mp->m_sb.sb_agblocks);
311 } else if (mp->m_dalign) {
312 mp->m_swidth = XFS_BB_TO_FSBT(mp, mp->m_swidth);
315 "alignment check failed: sunit(%d) less than bsize(%d)",
316 mp->m_dalign, mp->m_sb.sb_blocksize);
321 if (!xfs_sb_version_hasdalign(&mp->m_sb)) {
323 "cannot change alignment: superblock does not support data alignment");
330 /* Update alignment values based on mount options and sb values. */
332 xfs_update_alignment(
333 struct xfs_mount *mp)
335 struct xfs_sb *sbp = &mp->m_sb;
341 if (sbp->sb_unit == mp->m_dalign &&
342 sbp->sb_width == mp->m_swidth)
345 error = xfs_check_new_dalign(mp, mp->m_dalign, &update_sb);
346 if (error || !update_sb)
349 sbp->sb_unit = mp->m_dalign;
350 sbp->sb_width = mp->m_swidth;
351 mp->m_update_sb = true;
352 } else if ((mp->m_flags & XFS_MOUNT_NOALIGN) != XFS_MOUNT_NOALIGN &&
353 xfs_sb_version_hasdalign(&mp->m_sb)) {
354 mp->m_dalign = sbp->sb_unit;
355 mp->m_swidth = sbp->sb_width;
362 * precalculate the low space thresholds for dynamic speculative preallocation.
365 xfs_set_low_space_thresholds(
366 struct xfs_mount *mp)
368 uint64_t dblocks = mp->m_sb.sb_dblocks;
369 uint64_t rtexts = mp->m_sb.sb_rextents;
372 do_div(dblocks, 100);
375 for (i = 0; i < XFS_LOWSP_MAX; i++) {
376 mp->m_low_space[i] = dblocks * (i + 1);
377 mp->m_low_rtexts[i] = rtexts * (i + 1);
382 * Check that the data (and log if separate) is an ok size.
386 struct xfs_mount *mp)
392 d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks);
393 if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_dblocks) {
394 xfs_warn(mp, "filesystem size mismatch detected");
397 error = xfs_buf_read_uncached(mp->m_ddev_targp,
398 d - XFS_FSS_TO_BB(mp, 1),
399 XFS_FSS_TO_BB(mp, 1), 0, &bp, NULL);
401 xfs_warn(mp, "last sector read failed");
406 if (mp->m_logdev_targp == mp->m_ddev_targp)
409 d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks);
410 if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_logblocks) {
411 xfs_warn(mp, "log size mismatch detected");
414 error = xfs_buf_read_uncached(mp->m_logdev_targp,
415 d - XFS_FSB_TO_BB(mp, 1),
416 XFS_FSB_TO_BB(mp, 1), 0, &bp, NULL);
418 xfs_warn(mp, "log device read failed");
426 * Clear the quotaflags in memory and in the superblock.
429 xfs_mount_reset_sbqflags(
430 struct xfs_mount *mp)
434 /* It is OK to look at sb_qflags in the mount path without m_sb_lock. */
435 if (mp->m_sb.sb_qflags == 0)
437 spin_lock(&mp->m_sb_lock);
438 mp->m_sb.sb_qflags = 0;
439 spin_unlock(&mp->m_sb_lock);
441 if (!xfs_fs_writable(mp, SB_FREEZE_WRITE))
444 return xfs_sync_sb(mp, false);
448 xfs_default_resblks(xfs_mount_t *mp)
453 * We default to 5% or 8192 fsbs of space reserved, whichever is
454 * smaller. This is intended to cover concurrent allocation
455 * transactions when we initially hit enospc. These each require a 4
456 * block reservation. Hence by default we cover roughly 2000 concurrent
457 * allocation reservations.
459 resblks = mp->m_sb.sb_dblocks;
461 resblks = min_t(uint64_t, resblks, 8192);
465 /* Ensure the summary counts are correct. */
467 xfs_check_summary_counts(
468 struct xfs_mount *mp)
471 * The AG0 superblock verifier rejects in-progress filesystems,
472 * so we should never see the flag set this far into mounting.
474 if (mp->m_sb.sb_inprogress) {
475 xfs_err(mp, "sb_inprogress set after log recovery??");
477 return -EFSCORRUPTED;
481 * Now the log is mounted, we know if it was an unclean shutdown or
482 * not. If it was, with the first phase of recovery has completed, we
483 * have consistent AG blocks on disk. We have not recovered EFIs yet,
484 * but they are recovered transactionally in the second recovery phase
487 * If the log was clean when we mounted, we can check the summary
488 * counters. If any of them are obviously incorrect, we can recompute
489 * them from the AGF headers in the next step.
491 if (XFS_LAST_UNMOUNT_WAS_CLEAN(mp) &&
492 (mp->m_sb.sb_fdblocks > mp->m_sb.sb_dblocks ||
493 !xfs_verify_icount(mp, mp->m_sb.sb_icount) ||
494 mp->m_sb.sb_ifree > mp->m_sb.sb_icount))
495 xfs_fs_mark_sick(mp, XFS_SICK_FS_COUNTERS);
498 * We can safely re-initialise incore superblock counters from the
499 * per-ag data. These may not be correct if the filesystem was not
500 * cleanly unmounted, so we waited for recovery to finish before doing
503 * If the filesystem was cleanly unmounted or the previous check did
504 * not flag anything weird, then we can trust the values in the
505 * superblock to be correct and we don't need to do anything here.
506 * Otherwise, recalculate the summary counters.
508 if ((!xfs_sb_version_haslazysbcount(&mp->m_sb) ||
509 XFS_LAST_UNMOUNT_WAS_CLEAN(mp)) &&
510 !xfs_fs_has_sickness(mp, XFS_SICK_FS_COUNTERS))
513 return xfs_initialize_perag_data(mp, mp->m_sb.sb_agcount);
517 * Flush and reclaim dirty inodes in preparation for unmount. Inodes and
518 * internal inode structures can be sitting in the CIL and AIL at this point,
519 * so we need to unpin them, write them back and/or reclaim them before unmount
520 * can proceed. In other words, callers are required to have inactivated all
523 * An inode cluster that has been freed can have its buffer still pinned in
524 * memory because the transaction is still sitting in a iclog. The stale inodes
525 * on that buffer will be pinned to the buffer until the transaction hits the
526 * disk and the callbacks run. Pushing the AIL will skip the stale inodes and
527 * may never see the pinned buffer, so nothing will push out the iclog and
530 * Hence we need to force the log to unpin everything first. However, log
531 * forces don't wait for the discards they issue to complete, so we have to
532 * explicitly wait for them to complete here as well.
534 * Then we can tell the world we are unmounting so that error handling knows
535 * that the filesystem is going away and we should error out anything that we
536 * have been retrying in the background. This will prevent never-ending
537 * retries in AIL pushing from hanging the unmount.
539 * Finally, we can push the AIL to clean all the remaining dirty objects, then
540 * reclaim the remaining inodes that are still in memory at this point in time.
543 xfs_unmount_flush_inodes(
544 struct xfs_mount *mp)
546 xfs_log_force(mp, XFS_LOG_SYNC);
547 xfs_extent_busy_wait_all(mp);
548 flush_workqueue(xfs_discard_wq);
550 mp->m_flags |= XFS_MOUNT_UNMOUNTING;
552 xfs_ail_push_all_sync(mp->m_ail);
553 xfs_inodegc_stop(mp);
554 cancel_delayed_work_sync(&mp->m_reclaim_work);
555 xfs_reclaim_inodes(mp);
556 xfs_health_unmount(mp);
560 xfs_mount_setup_inode_geom(
561 struct xfs_mount *mp)
563 struct xfs_ino_geometry *igeo = M_IGEO(mp);
565 igeo->attr_fork_offset = xfs_bmap_compute_attr_offset(mp);
566 ASSERT(igeo->attr_fork_offset < XFS_LITINO(mp));
568 xfs_ialloc_setup_geometry(mp);
572 * This function does the following on an initial mount of a file system:
573 * - reads the superblock from disk and init the mount struct
574 * - if we're a 32-bit kernel, do a size check on the superblock
575 * so we don't mount terabyte filesystems
576 * - init mount struct realtime fields
577 * - allocate inode hash table for fs
578 * - init directory manager
579 * - perform recovery and init the log manager
583 struct xfs_mount *mp)
585 struct xfs_sb *sbp = &(mp->m_sb);
586 struct xfs_inode *rip;
587 struct xfs_ino_geometry *igeo = M_IGEO(mp);
593 xfs_sb_mount_common(mp, sbp);
596 * Check for a mismatched features2 values. Older kernels read & wrote
597 * into the wrong sb offset for sb_features2 on some platforms due to
598 * xfs_sb_t not being 64bit size aligned when sb_features2 was added,
599 * which made older superblock reading/writing routines swap it as a
602 * For backwards compatibility, we make both slots equal.
604 * If we detect a mismatched field, we OR the set bits into the existing
605 * features2 field in case it has already been modified; we don't want
606 * to lose any features. We then update the bad location with the ORed
607 * value so that older kernels will see any features2 flags. The
608 * superblock writeback code ensures the new sb_features2 is copied to
609 * sb_bad_features2 before it is logged or written to disk.
611 if (xfs_sb_has_mismatched_features2(sbp)) {
612 xfs_warn(mp, "correcting sb_features alignment problem");
613 sbp->sb_features2 |= sbp->sb_bad_features2;
614 mp->m_update_sb = true;
618 /* always use v2 inodes by default now */
619 if (!(mp->m_sb.sb_versionnum & XFS_SB_VERSION_NLINKBIT)) {
620 mp->m_sb.sb_versionnum |= XFS_SB_VERSION_NLINKBIT;
621 mp->m_update_sb = true;
625 * If we were given new sunit/swidth options, do some basic validation
626 * checks and convert the incore dalign and swidth values to the
627 * same units (FSB) that everything else uses. This /must/ happen
628 * before computing the inode geometry.
630 error = xfs_validate_new_dalign(mp);
634 xfs_alloc_compute_maxlevels(mp);
635 xfs_bmap_compute_maxlevels(mp, XFS_DATA_FORK);
636 xfs_bmap_compute_maxlevels(mp, XFS_ATTR_FORK);
637 xfs_mount_setup_inode_geom(mp);
638 xfs_rmapbt_compute_maxlevels(mp);
639 xfs_refcountbt_compute_maxlevels(mp);
642 * Check if sb_agblocks is aligned at stripe boundary. If sb_agblocks
643 * is NOT aligned turn off m_dalign since allocator alignment is within
644 * an ag, therefore ag has to be aligned at stripe boundary. Note that
645 * we must compute the free space and rmap btree geometry before doing
648 error = xfs_update_alignment(mp);
652 /* enable fail_at_unmount as default */
653 mp->m_fail_unmount = true;
655 error = xfs_sysfs_init(&mp->m_kobj, &xfs_mp_ktype,
656 NULL, mp->m_super->s_id);
660 error = xfs_sysfs_init(&mp->m_stats.xs_kobj, &xfs_stats_ktype,
661 &mp->m_kobj, "stats");
663 goto out_remove_sysfs;
665 error = xfs_error_sysfs_init(mp);
669 error = xfs_errortag_init(mp);
671 goto out_remove_error_sysfs;
673 error = xfs_uuid_mount(mp);
675 goto out_remove_errortag;
678 * Update the preferred write size based on the information from the
679 * on-disk superblock.
681 mp->m_allocsize_log =
682 max_t(uint32_t, sbp->sb_blocklog, mp->m_allocsize_log);
683 mp->m_allocsize_blocks = 1U << (mp->m_allocsize_log - sbp->sb_blocklog);
685 /* set the low space thresholds for dynamic preallocation */
686 xfs_set_low_space_thresholds(mp);
689 * If enabled, sparse inode chunk alignment is expected to match the
690 * cluster size. Full inode chunk alignment must match the chunk size,
691 * but that is checked on sb read verification...
693 if (xfs_sb_version_hassparseinodes(&mp->m_sb) &&
694 mp->m_sb.sb_spino_align !=
695 XFS_B_TO_FSBT(mp, igeo->inode_cluster_size_raw)) {
697 "Sparse inode block alignment (%u) must match cluster size (%llu).",
698 mp->m_sb.sb_spino_align,
699 XFS_B_TO_FSBT(mp, igeo->inode_cluster_size_raw));
701 goto out_remove_uuid;
705 * Check that the data (and log if separate) is an ok size.
707 error = xfs_check_sizes(mp);
709 goto out_remove_uuid;
712 * Initialize realtime fields in the mount structure
714 error = xfs_rtmount_init(mp);
716 xfs_warn(mp, "RT mount failed");
717 goto out_remove_uuid;
721 * Copies the low order bits of the timestamp and the randomly
722 * set "sequence" number out of a UUID.
725 (get_unaligned_be16(&sbp->sb_uuid.b[8]) << 16) |
726 get_unaligned_be16(&sbp->sb_uuid.b[4]);
727 mp->m_fixedfsid[1] = get_unaligned_be32(&sbp->sb_uuid.b[0]);
729 error = xfs_da_mount(mp);
731 xfs_warn(mp, "Failed dir/attr init: %d", error);
732 goto out_remove_uuid;
736 * Initialize the precomputed transaction reservations values.
741 * Allocate and initialize the per-ag data.
743 error = xfs_initialize_perag(mp, sbp->sb_agcount, &mp->m_maxagi);
745 xfs_warn(mp, "Failed per-ag init: %d", error);
749 if (XFS_IS_CORRUPT(mp, !sbp->sb_logblocks)) {
750 xfs_warn(mp, "no log defined");
751 error = -EFSCORRUPTED;
755 error = xfs_inodegc_register_shrinker(mp);
760 * Log's mount-time initialization. The first part of recovery can place
761 * some items on the AIL, to be handled when recovery is finished or
764 error = xfs_log_mount(mp, mp->m_logdev_targp,
765 XFS_FSB_TO_DADDR(mp, sbp->sb_logstart),
766 XFS_FSB_TO_BB(mp, sbp->sb_logblocks));
768 xfs_warn(mp, "log mount failed");
769 goto out_inodegc_shrinker;
772 /* Make sure the summary counts are ok. */
773 error = xfs_check_summary_counts(mp);
775 goto out_log_dealloc;
777 /* Enable background inode inactivation workers. */
778 xfs_inodegc_start(mp);
779 xfs_blockgc_start(mp);
782 * Now that we've recovered any pending superblock feature bit
783 * additions, we can finish setting up the attr2 behaviour for the
784 * mount. If no attr2 mount options were specified, the we use the
785 * behaviour specified by the superblock feature bit.
787 if (!(mp->m_flags & (XFS_MOUNT_ATTR2|XFS_MOUNT_NOATTR2)) &&
788 xfs_sb_version_hasattr2(&mp->m_sb))
789 mp->m_flags |= XFS_MOUNT_ATTR2;
792 * Get and sanity-check the root inode.
793 * Save the pointer to it in the mount structure.
795 error = xfs_iget(mp, NULL, sbp->sb_rootino, XFS_IGET_UNTRUSTED,
796 XFS_ILOCK_EXCL, &rip);
799 "Failed to read root inode 0x%llx, error %d",
800 sbp->sb_rootino, -error);
801 goto out_log_dealloc;
806 if (XFS_IS_CORRUPT(mp, !S_ISDIR(VFS_I(rip)->i_mode))) {
807 xfs_warn(mp, "corrupted root inode %llu: not a directory",
808 (unsigned long long)rip->i_ino);
809 xfs_iunlock(rip, XFS_ILOCK_EXCL);
810 error = -EFSCORRUPTED;
813 mp->m_rootip = rip; /* save it */
815 xfs_iunlock(rip, XFS_ILOCK_EXCL);
818 * Initialize realtime inode pointers in the mount structure
820 error = xfs_rtmount_inodes(mp);
823 * Free up the root inode.
825 xfs_warn(mp, "failed to read RT inodes");
830 * If this is a read-only mount defer the superblock updates until
831 * the next remount into writeable mode. Otherwise we would never
832 * perform the update e.g. for the root filesystem.
834 if (mp->m_update_sb && !(mp->m_flags & XFS_MOUNT_RDONLY)) {
835 error = xfs_sync_sb(mp, false);
837 xfs_warn(mp, "failed to write sb changes");
843 * Initialise the XFS quota management subsystem for this mount
845 if (XFS_IS_QUOTA_ON(mp)) {
846 error = xfs_qm_newmount(mp, "amount, "aflags);
851 * If a file system had quotas running earlier, but decided to
852 * mount without -o uquota/pquota/gquota options, revoke the
853 * quotachecked license.
855 if (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT) {
856 xfs_notice(mp, "resetting quota flags");
857 error = xfs_mount_reset_sbqflags(mp);
864 * Finish recovering the file system. This part needed to be delayed
865 * until after the root and real-time bitmap inodes were consistently
866 * read in. Temporarily create per-AG space reservations for metadata
867 * btree shape changes because space freeing transactions (for inode
868 * inactivation) require the per-AG reservation in lieu of reserving
871 error = xfs_fs_reserve_ag_blocks(mp);
872 if (error && error == -ENOSPC)
874 "ENOSPC reserving per-AG metadata pool, log recovery may fail.");
875 error = xfs_log_mount_finish(mp);
876 xfs_fs_unreserve_ag_blocks(mp);
878 xfs_warn(mp, "log mount finish failed");
883 * Now the log is fully replayed, we can transition to full read-only
884 * mode for read-only mounts. This will sync all the metadata and clean
885 * the log so that the recovery we just performed does not have to be
886 * replayed again on the next mount.
888 * We use the same quiesce mechanism as the rw->ro remount, as they are
889 * semantically identical operations.
891 if ((mp->m_flags & (XFS_MOUNT_RDONLY|XFS_MOUNT_NORECOVERY)) ==
897 * Complete the quota initialisation, post-log-replay component.
900 ASSERT(mp->m_qflags == 0);
901 mp->m_qflags = quotaflags;
903 xfs_qm_mount_quotas(mp);
907 * Now we are mounted, reserve a small amount of unused space for
908 * privileged transactions. This is needed so that transaction
909 * space required for critical operations can dip into this pool
910 * when at ENOSPC. This is needed for operations like create with
911 * attr, unwritten extent conversion at ENOSPC, etc. Data allocations
912 * are not allowed to use this reserved space.
914 * This may drive us straight to ENOSPC on mount, but that implies
915 * we were already there on the last unmount. Warn if this occurs.
917 if (!(mp->m_flags & XFS_MOUNT_RDONLY)) {
918 resblks = xfs_default_resblks(mp);
919 error = xfs_reserve_blocks(mp, &resblks, NULL);
922 "Unable to allocate reserve blocks. Continuing without reserve pool.");
924 /* Recover any CoW blocks that never got remapped. */
925 error = xfs_reflink_recover_cow(mp);
928 "Error %d recovering leftover CoW allocations.", error);
929 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
933 /* Reserve AG blocks for future btree expansion. */
934 error = xfs_fs_reserve_ag_blocks(mp);
935 if (error && error != -ENOSPC)
942 xfs_fs_unreserve_ag_blocks(mp);
944 xfs_qm_unmount_quotas(mp);
946 xfs_rtunmount_inodes(mp);
949 /* Clean out dquots that might be in memory after quotacheck. */
953 * Inactivate all inodes that might still be in memory after a log
954 * intent recovery failure so that reclaim can free them. Metadata
955 * inodes and the root directory shouldn't need inactivation, but the
956 * mount failed for some reason, so pull down all the state and flee.
958 xfs_inodegc_flush(mp);
961 * Flush all inode reclamation work and flush the log.
962 * We have to do this /after/ rtunmount and qm_unmount because those
963 * two will have scheduled delayed reclaim for the rt/quota inodes.
965 * This is slightly different from the unmountfs call sequence
966 * because we could be tearing down a partially set up mount. In
967 * particular, if log_mount_finish fails we bail out without calling
968 * qm_unmount_quotas and therefore rely on qm_unmount to release the
971 xfs_unmount_flush_inodes(mp);
973 xfs_log_mount_cancel(mp);
974 out_inodegc_shrinker:
975 unregister_shrinker(&mp->m_inodegc_shrinker);
977 if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp)
978 xfs_buftarg_drain(mp->m_logdev_targp);
979 xfs_buftarg_drain(mp->m_ddev_targp);
985 xfs_uuid_unmount(mp);
987 xfs_errortag_del(mp);
988 out_remove_error_sysfs:
989 xfs_error_sysfs_del(mp);
991 xfs_sysfs_del(&mp->m_stats.xs_kobj);
993 xfs_sysfs_del(&mp->m_kobj);
999 * This flushes out the inodes,dquots and the superblock, unmounts the
1000 * log and makes sure that incore structures are freed.
1004 struct xfs_mount *mp)
1010 * Perform all on-disk metadata updates required to inactivate inodes
1011 * that the VFS evicted earlier in the unmount process. Freeing inodes
1012 * and discarding CoW fork preallocations can cause shape changes to
1013 * the free inode and refcount btrees, respectively, so we must finish
1014 * this before we discard the metadata space reservations. Metadata
1015 * inodes and the root directory do not require inactivation.
1017 xfs_inodegc_flush(mp);
1019 xfs_blockgc_stop(mp);
1020 xfs_fs_unreserve_ag_blocks(mp);
1021 xfs_qm_unmount_quotas(mp);
1022 xfs_rtunmount_inodes(mp);
1023 xfs_irele(mp->m_rootip);
1025 xfs_unmount_flush_inodes(mp);
1030 * Unreserve any blocks we have so that when we unmount we don't account
1031 * the reserved free space as used. This is really only necessary for
1032 * lazy superblock counting because it trusts the incore superblock
1033 * counters to be absolutely correct on clean unmount.
1035 * We don't bother correcting this elsewhere for lazy superblock
1036 * counting because on mount of an unclean filesystem we reconstruct the
1037 * correct counter value and this is irrelevant.
1039 * For non-lazy counter filesystems, this doesn't matter at all because
1040 * we only every apply deltas to the superblock and hence the incore
1041 * value does not matter....
1044 error = xfs_reserve_blocks(mp, &resblks, NULL);
1046 xfs_warn(mp, "Unable to free reserved block pool. "
1047 "Freespace may not be correct on next mount.");
1049 xfs_log_unmount(mp);
1051 xfs_uuid_unmount(mp);
1054 xfs_errortag_clearall(mp);
1056 unregister_shrinker(&mp->m_inodegc_shrinker);
1059 xfs_errortag_del(mp);
1060 xfs_error_sysfs_del(mp);
1061 xfs_sysfs_del(&mp->m_stats.xs_kobj);
1062 xfs_sysfs_del(&mp->m_kobj);
1066 * Determine whether modifications can proceed. The caller specifies the minimum
1067 * freeze level for which modifications should not be allowed. This allows
1068 * certain operations to proceed while the freeze sequence is in progress, if
1073 struct xfs_mount *mp,
1076 ASSERT(level > SB_UNFROZEN);
1077 if ((mp->m_super->s_writers.frozen >= level) ||
1078 XFS_FORCED_SHUTDOWN(mp) || (mp->m_flags & XFS_MOUNT_RDONLY))
1086 struct xfs_mount *mp,
1097 * If the reserve pool is depleted, put blocks back into it
1098 * first. Most of the time the pool is full.
1100 if (likely(mp->m_resblks == mp->m_resblks_avail)) {
1101 percpu_counter_add(&mp->m_fdblocks, delta);
1105 spin_lock(&mp->m_sb_lock);
1106 res_used = (long long)(mp->m_resblks - mp->m_resblks_avail);
1108 if (res_used > delta) {
1109 mp->m_resblks_avail += delta;
1112 mp->m_resblks_avail = mp->m_resblks;
1113 percpu_counter_add(&mp->m_fdblocks, delta);
1115 spin_unlock(&mp->m_sb_lock);
1120 * Taking blocks away, need to be more accurate the closer we
1123 * If the counter has a value of less than 2 * max batch size,
1124 * then make everything serialise as we are real close to
1127 if (__percpu_counter_compare(&mp->m_fdblocks, 2 * XFS_FDBLOCKS_BATCH,
1128 XFS_FDBLOCKS_BATCH) < 0)
1131 batch = XFS_FDBLOCKS_BATCH;
1134 * Set aside allocbt blocks because these blocks are tracked as free
1135 * space but not available for allocation. Technically this means that a
1136 * single reservation cannot consume all remaining free space, but the
1137 * ratio of allocbt blocks to usable free blocks should be rather small.
1138 * The tradeoff without this is that filesystems that maintain high
1139 * perag block reservations can over reserve physical block availability
1140 * and fail physical allocation, which leads to much more serious
1141 * problems (i.e. transaction abort, pagecache discards, etc.) than
1142 * slightly premature -ENOSPC.
1144 set_aside = mp->m_alloc_set_aside + atomic64_read(&mp->m_allocbt_blks);
1145 percpu_counter_add_batch(&mp->m_fdblocks, delta, batch);
1146 if (__percpu_counter_compare(&mp->m_fdblocks, set_aside,
1147 XFS_FDBLOCKS_BATCH) >= 0) {
1153 * lock up the sb for dipping into reserves before releasing the space
1154 * that took us to ENOSPC.
1156 spin_lock(&mp->m_sb_lock);
1157 percpu_counter_add(&mp->m_fdblocks, -delta);
1159 goto fdblocks_enospc;
1161 lcounter = (long long)mp->m_resblks_avail + delta;
1162 if (lcounter >= 0) {
1163 mp->m_resblks_avail = lcounter;
1164 spin_unlock(&mp->m_sb_lock);
1168 "Reserve blocks depleted! Consider increasing reserve pool size.");
1171 spin_unlock(&mp->m_sb_lock);
1177 struct xfs_mount *mp,
1183 spin_lock(&mp->m_sb_lock);
1184 lcounter = mp->m_sb.sb_frextents + delta;
1188 mp->m_sb.sb_frextents = lcounter;
1189 spin_unlock(&mp->m_sb_lock);
1194 * Used to free the superblock along various error paths.
1198 struct xfs_mount *mp)
1200 struct xfs_buf *bp = mp->m_sb_bp;
1208 * If the underlying (data/log/rt) device is readonly, there are some
1209 * operations that cannot proceed.
1212 xfs_dev_is_read_only(
1213 struct xfs_mount *mp,
1216 if (xfs_readonly_buftarg(mp->m_ddev_targp) ||
1217 xfs_readonly_buftarg(mp->m_logdev_targp) ||
1218 (mp->m_rtdev_targp && xfs_readonly_buftarg(mp->m_rtdev_targp))) {
1219 xfs_notice(mp, "%s required on read-only device.", message);
1220 xfs_notice(mp, "write access unavailable, cannot proceed.");
1226 /* Force the summary counters to be recalculated at next mount. */
1228 xfs_force_summary_recalc(
1229 struct xfs_mount *mp)
1231 if (!xfs_sb_version_haslazysbcount(&mp->m_sb))
1234 xfs_fs_mark_sick(mp, XFS_SICK_FS_COUNTERS);
1238 * Enable a log incompat feature flag in the primary superblock. The caller
1239 * cannot have any other transactions in progress.
1242 xfs_add_incompat_log_feature(
1243 struct xfs_mount *mp,
1246 struct xfs_dsb *dsb;
1249 ASSERT(hweight32(feature) == 1);
1250 ASSERT(!(feature & XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN));
1253 * Force the log to disk and kick the background AIL thread to reduce
1254 * the chances that the bwrite will stall waiting for the AIL to unpin
1255 * the primary superblock buffer. This isn't a data integrity
1256 * operation, so we don't need a synchronous push.
1258 error = xfs_log_force(mp, XFS_LOG_SYNC);
1261 xfs_ail_push_all(mp->m_ail);
1264 * Lock the primary superblock buffer to serialize all callers that
1265 * are trying to set feature bits.
1267 xfs_buf_lock(mp->m_sb_bp);
1268 xfs_buf_hold(mp->m_sb_bp);
1270 if (XFS_FORCED_SHUTDOWN(mp)) {
1275 if (xfs_sb_has_incompat_log_feature(&mp->m_sb, feature))
1279 * Write the primary superblock to disk immediately, because we need
1280 * the log_incompat bit to be set in the primary super now to protect
1281 * the log items that we're going to commit later.
1283 dsb = mp->m_sb_bp->b_addr;
1284 xfs_sb_to_disk(dsb, &mp->m_sb);
1285 dsb->sb_features_log_incompat |= cpu_to_be32(feature);
1286 error = xfs_bwrite(mp->m_sb_bp);
1291 * Add the feature bits to the incore superblock before we unlock the
1294 xfs_sb_add_incompat_log_features(&mp->m_sb, feature);
1295 xfs_buf_relse(mp->m_sb_bp);
1297 /* Log the superblock to disk. */
1298 return xfs_sync_sb(mp, false);
1300 xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR);
1302 xfs_buf_relse(mp->m_sb_bp);
1307 * Clear all the log incompat flags from the superblock.
1309 * The caller cannot be in a transaction, must ensure that the log does not
1310 * contain any log items protected by any log incompat bit, and must ensure
1311 * that there are no other threads that depend on the state of the log incompat
1312 * feature flags in the primary super.
1314 * Returns true if the superblock is dirty.
1317 xfs_clear_incompat_log_features(
1318 struct xfs_mount *mp)
1322 if (!xfs_sb_version_hascrc(&mp->m_sb) ||
1323 !xfs_sb_has_incompat_log_feature(&mp->m_sb,
1324 XFS_SB_FEAT_INCOMPAT_LOG_ALL) ||
1325 XFS_FORCED_SHUTDOWN(mp))
1329 * Update the incore superblock. We synchronize on the primary super
1330 * buffer lock to be consistent with the add function, though at least
1331 * in theory this shouldn't be necessary.
1333 xfs_buf_lock(mp->m_sb_bp);
1334 xfs_buf_hold(mp->m_sb_bp);
1336 if (xfs_sb_has_incompat_log_feature(&mp->m_sb,
1337 XFS_SB_FEAT_INCOMPAT_LOG_ALL)) {
1338 xfs_info(mp, "Clearing log incompat feature flags.");
1339 xfs_sb_remove_incompat_log_features(&mp->m_sb);
1343 xfs_buf_relse(mp->m_sb_bp);
1348 * Update the in-core delayed block counter.
1350 * We prefer to update the counter without having to take a spinlock for every
1351 * counter update (i.e. batching). Each change to delayed allocation
1352 * reservations can change can easily exceed the default percpu counter
1353 * batching, so we use a larger batch factor here.
1355 * Note that we don't currently have any callers requiring fast summation
1356 * (e.g. percpu_counter_read) so we can use a big batch value here.
1358 #define XFS_DELALLOC_BATCH (4096)
1361 struct xfs_mount *mp,
1364 percpu_counter_add_batch(&mp->m_delalloc_blks, delta,
1365 XFS_DELALLOC_BATCH);