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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Copyright (c) 2000-2005 Silicon Graphics, Inc.
- * All Rights Reserved.
- */
- #include "xfs.h"
- #include "xfs_fs.h"
- #include "xfs_shared.h"
- #include "xfs_format.h"
- #include "xfs_log_format.h"
- #include "xfs_trans_resv.h"
- #include "xfs_bit.h"
- #include "xfs_sb.h"
- #include "xfs_mount.h"
- #include "xfs_inode.h"
- #include "xfs_dir2.h"
- #include "xfs_ialloc.h"
- #include "xfs_alloc.h"
- #include "xfs_rtalloc.h"
- #include "xfs_bmap.h"
- #include "xfs_trans.h"
- #include "xfs_trans_priv.h"
- #include "xfs_log.h"
- #include "xfs_error.h"
- #include "xfs_quota.h"
- #include "xfs_fsops.h"
- #include "xfs_icache.h"
- #include "xfs_sysfs.h"
- #include "xfs_rmap_btree.h"
- #include "xfs_refcount_btree.h"
- #include "xfs_reflink.h"
- #include "xfs_extent_busy.h"
- #include "xfs_health.h"
- #include "xfs_trace.h"
- static DEFINE_MUTEX(xfs_uuid_table_mutex);
- static int xfs_uuid_table_size;
- static uuid_t *xfs_uuid_table;
- void
- xfs_uuid_table_free(void)
- {
- if (xfs_uuid_table_size == 0)
- return;
- kmem_free(xfs_uuid_table);
- xfs_uuid_table = NULL;
- xfs_uuid_table_size = 0;
- }
- /*
- * See if the UUID is unique among mounted XFS filesystems.
- * Mount fails if UUID is nil or a FS with the same UUID is already mounted.
- */
- STATIC int
- xfs_uuid_mount(
- struct xfs_mount *mp)
- {
- uuid_t *uuid = &mp->m_sb.sb_uuid;
- int hole, i;
- /* Publish UUID in struct super_block */
- uuid_copy(&mp->m_super->s_uuid, uuid);
- if (mp->m_flags & XFS_MOUNT_NOUUID)
- return 0;
- if (uuid_is_null(uuid)) {
- xfs_warn(mp, "Filesystem has null UUID - can't mount");
- return -EINVAL;
- }
- mutex_lock(&xfs_uuid_table_mutex);
- for (i = 0, hole = -1; i < xfs_uuid_table_size; i++) {
- if (uuid_is_null(&xfs_uuid_table[i])) {
- hole = i;
- continue;
- }
- if (uuid_equal(uuid, &xfs_uuid_table[i]))
- goto out_duplicate;
- }
- if (hole < 0) {
- xfs_uuid_table = krealloc(xfs_uuid_table,
- (xfs_uuid_table_size + 1) * sizeof(*xfs_uuid_table),
- GFP_KERNEL | __GFP_NOFAIL);
- hole = xfs_uuid_table_size++;
- }
- xfs_uuid_table[hole] = *uuid;
- mutex_unlock(&xfs_uuid_table_mutex);
- return 0;
- out_duplicate:
- mutex_unlock(&xfs_uuid_table_mutex);
- xfs_warn(mp, "Filesystem has duplicate UUID %pU - can't mount", uuid);
- return -EINVAL;
- }
- STATIC void
- xfs_uuid_unmount(
- struct xfs_mount *mp)
- {
- uuid_t *uuid = &mp->m_sb.sb_uuid;
- int i;
- if (mp->m_flags & XFS_MOUNT_NOUUID)
- return;
- mutex_lock(&xfs_uuid_table_mutex);
- for (i = 0; i < xfs_uuid_table_size; i++) {
- if (uuid_is_null(&xfs_uuid_table[i]))
- continue;
- if (!uuid_equal(uuid, &xfs_uuid_table[i]))
- continue;
- memset(&xfs_uuid_table[i], 0, sizeof(uuid_t));
- break;
- }
- ASSERT(i < xfs_uuid_table_size);
- mutex_unlock(&xfs_uuid_table_mutex);
- }
- STATIC void
- __xfs_free_perag(
- struct rcu_head *head)
- {
- struct xfs_perag *pag = container_of(head, struct xfs_perag, rcu_head);
- ASSERT(atomic_read(&pag->pag_ref) == 0);
- kmem_free(pag);
- }
- /*
- * Free up the per-ag resources associated with the mount structure.
- */
- STATIC void
- xfs_free_perag(
- xfs_mount_t *mp)
- {
- xfs_agnumber_t agno;
- struct xfs_perag *pag;
- for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) {
- spin_lock(&mp->m_perag_lock);
- pag = radix_tree_delete(&mp->m_perag_tree, agno);
- spin_unlock(&mp->m_perag_lock);
- ASSERT(pag);
- ASSERT(atomic_read(&pag->pag_ref) == 0);
- xfs_iunlink_destroy(pag);
- xfs_buf_hash_destroy(pag);
- call_rcu(&pag->rcu_head, __xfs_free_perag);
- }
- }
- /*
- * Check size of device based on the (data/realtime) block count.
- * Note: this check is used by the growfs code as well as mount.
- */
- int
- xfs_sb_validate_fsb_count(
- xfs_sb_t *sbp,
- uint64_t nblocks)
- {
- ASSERT(PAGE_SHIFT >= sbp->sb_blocklog);
- ASSERT(sbp->sb_blocklog >= BBSHIFT);
- /* Limited by ULONG_MAX of page cache index */
- if (nblocks >> (PAGE_SHIFT - sbp->sb_blocklog) > ULONG_MAX)
- return -EFBIG;
- return 0;
- }
- int
- xfs_initialize_perag(
- xfs_mount_t *mp,
- xfs_agnumber_t agcount,
- xfs_agnumber_t *maxagi)
- {
- xfs_agnumber_t index;
- xfs_agnumber_t first_initialised = NULLAGNUMBER;
- xfs_perag_t *pag;
- int error = -ENOMEM;
- /*
- * Walk the current per-ag tree so we don't try to initialise AGs
- * that already exist (growfs case). Allocate and insert all the
- * AGs we don't find ready for initialisation.
- */
- for (index = 0; index < agcount; index++) {
- pag = xfs_perag_get(mp, index);
- if (pag) {
- xfs_perag_put(pag);
- continue;
- }
- pag = kmem_zalloc(sizeof(*pag), KM_MAYFAIL);
- if (!pag) {
- error = -ENOMEM;
- goto out_unwind_new_pags;
- }
- pag->pag_agno = index;
- pag->pag_mount = mp;
- spin_lock_init(&pag->pag_ici_lock);
- INIT_RADIX_TREE(&pag->pag_ici_root, GFP_ATOMIC);
- error = xfs_buf_hash_init(pag);
- if (error)
- goto out_free_pag;
- init_waitqueue_head(&pag->pagb_wait);
- spin_lock_init(&pag->pagb_lock);
- pag->pagb_count = 0;
- pag->pagb_tree = RB_ROOT;
- error = radix_tree_preload(GFP_NOFS);
- if (error)
- goto out_hash_destroy;
- spin_lock(&mp->m_perag_lock);
- if (radix_tree_insert(&mp->m_perag_tree, index, pag)) {
- WARN_ON_ONCE(1);
- spin_unlock(&mp->m_perag_lock);
- radix_tree_preload_end();
- error = -EEXIST;
- goto out_hash_destroy;
- }
- spin_unlock(&mp->m_perag_lock);
- radix_tree_preload_end();
- /* first new pag is fully initialized */
- if (first_initialised == NULLAGNUMBER)
- first_initialised = index;
- error = xfs_iunlink_init(pag);
- if (error)
- goto out_hash_destroy;
- spin_lock_init(&pag->pag_state_lock);
- }
- index = xfs_set_inode_alloc(mp, agcount);
- if (maxagi)
- *maxagi = index;
- mp->m_ag_prealloc_blocks = xfs_prealloc_blocks(mp);
- return 0;
- out_hash_destroy:
- xfs_buf_hash_destroy(pag);
- out_free_pag:
- kmem_free(pag);
- out_unwind_new_pags:
- /* unwind any prior newly initialized pags */
- for (index = first_initialised; index < agcount; index++) {
- pag = radix_tree_delete(&mp->m_perag_tree, index);
- if (!pag)
- break;
- xfs_buf_hash_destroy(pag);
- xfs_iunlink_destroy(pag);
- kmem_free(pag);
- }
- return error;
- }
- /*
- * xfs_readsb
- *
- * Does the initial read of the superblock.
- */
- int
- xfs_readsb(
- struct xfs_mount *mp,
- int flags)
- {
- unsigned int sector_size;
- struct xfs_buf *bp;
- struct xfs_sb *sbp = &mp->m_sb;
- int error;
- int loud = !(flags & XFS_MFSI_QUIET);
- const struct xfs_buf_ops *buf_ops;
- ASSERT(mp->m_sb_bp == NULL);
- ASSERT(mp->m_ddev_targp != NULL);
- /*
- * For the initial read, we must guess at the sector
- * size based on the block device. It's enough to
- * get the sb_sectsize out of the superblock and
- * then reread with the proper length.
- * We don't verify it yet, because it may not be complete.
- */
- sector_size = xfs_getsize_buftarg(mp->m_ddev_targp);
- buf_ops = NULL;
- /*
- * Allocate a (locked) buffer to hold the superblock. This will be kept
- * around at all times to optimize access to the superblock. Therefore,
- * set XBF_NO_IOACCT to make sure it doesn't hold the buftarg count
- * elevated.
- */
- reread:
- error = xfs_buf_read_uncached(mp->m_ddev_targp, XFS_SB_DADDR,
- BTOBB(sector_size), XBF_NO_IOACCT, &bp,
- buf_ops);
- if (error) {
- if (loud)
- xfs_warn(mp, "SB validate failed with error %d.", error);
- /* bad CRC means corrupted metadata */
- if (error == -EFSBADCRC)
- error = -EFSCORRUPTED;
- return error;
- }
- /*
- * Initialize the mount structure from the superblock.
- */
- xfs_sb_from_disk(sbp, bp->b_addr);
- /*
- * If we haven't validated the superblock, do so now before we try
- * to check the sector size and reread the superblock appropriately.
- */
- if (sbp->sb_magicnum != XFS_SB_MAGIC) {
- if (loud)
- xfs_warn(mp, "Invalid superblock magic number");
- error = -EINVAL;
- goto release_buf;
- }
- /*
- * We must be able to do sector-sized and sector-aligned IO.
- */
- if (sector_size > sbp->sb_sectsize) {
- if (loud)
- xfs_warn(mp, "device supports %u byte sectors (not %u)",
- sector_size, sbp->sb_sectsize);
- error = -ENOSYS;
- goto release_buf;
- }
- if (buf_ops == NULL) {
- /*
- * Re-read the superblock so the buffer is correctly sized,
- * and properly verified.
- */
- xfs_buf_relse(bp);
- sector_size = sbp->sb_sectsize;
- buf_ops = loud ? &xfs_sb_buf_ops : &xfs_sb_quiet_buf_ops;
- goto reread;
- }
- xfs_reinit_percpu_counters(mp);
- /* no need to be quiet anymore, so reset the buf ops */
- bp->b_ops = &xfs_sb_buf_ops;
- mp->m_sb_bp = bp;
- xfs_buf_unlock(bp);
- return 0;
- release_buf:
- xfs_buf_relse(bp);
- return error;
- }
- /*
- * If the sunit/swidth change would move the precomputed root inode value, we
- * must reject the ondisk change because repair will stumble over that.
- * However, we allow the mount to proceed because we never rejected this
- * combination before. Returns true to update the sb, false otherwise.
- */
- static inline int
- xfs_check_new_dalign(
- struct xfs_mount *mp,
- int new_dalign,
- bool *update_sb)
- {
- struct xfs_sb *sbp = &mp->m_sb;
- xfs_ino_t calc_ino;
- calc_ino = xfs_ialloc_calc_rootino(mp, new_dalign);
- trace_xfs_check_new_dalign(mp, new_dalign, calc_ino);
- if (sbp->sb_rootino == calc_ino) {
- *update_sb = true;
- return 0;
- }
- xfs_warn(mp,
- "Cannot change stripe alignment; would require moving root inode.");
- /*
- * XXX: Next time we add a new incompat feature, this should start
- * returning -EINVAL to fail the mount. Until then, spit out a warning
- * that we're ignoring the administrator's instructions.
- */
- xfs_warn(mp, "Skipping superblock stripe alignment update.");
- *update_sb = false;
- return 0;
- }
- /*
- * If we were provided with new sunit/swidth values as mount options, make sure
- * that they pass basic alignment and superblock feature checks, and convert
- * them into the same units (FSB) that everything else expects. This step
- * /must/ be done before computing the inode geometry.
- */
- STATIC int
- xfs_validate_new_dalign(
- struct xfs_mount *mp)
- {
- if (mp->m_dalign == 0)
- return 0;
- /*
- * If stripe unit and stripe width are not multiples
- * of the fs blocksize turn off alignment.
- */
- if ((BBTOB(mp->m_dalign) & mp->m_blockmask) ||
- (BBTOB(mp->m_swidth) & mp->m_blockmask)) {
- xfs_warn(mp,
- "alignment check failed: sunit/swidth vs. blocksize(%d)",
- mp->m_sb.sb_blocksize);
- return -EINVAL;
- } else {
- /*
- * Convert the stripe unit and width to FSBs.
- */
- mp->m_dalign = XFS_BB_TO_FSBT(mp, mp->m_dalign);
- if (mp->m_dalign && (mp->m_sb.sb_agblocks % mp->m_dalign)) {
- xfs_warn(mp,
- "alignment check failed: sunit/swidth vs. agsize(%d)",
- mp->m_sb.sb_agblocks);
- return -EINVAL;
- } else if (mp->m_dalign) {
- mp->m_swidth = XFS_BB_TO_FSBT(mp, mp->m_swidth);
- } else {
- xfs_warn(mp,
- "alignment check failed: sunit(%d) less than bsize(%d)",
- mp->m_dalign, mp->m_sb.sb_blocksize);
- return -EINVAL;
- }
- }
- if (!xfs_sb_version_hasdalign(&mp->m_sb)) {
- xfs_warn(mp,
- "cannot change alignment: superblock does not support data alignment");
- return -EINVAL;
- }
- return 0;
- }
- /* Update alignment values based on mount options and sb values. */
- STATIC int
- xfs_update_alignment(
- struct xfs_mount *mp)
- {
- struct xfs_sb *sbp = &mp->m_sb;
- if (mp->m_dalign) {
- bool update_sb;
- int error;
- if (sbp->sb_unit == mp->m_dalign &&
- sbp->sb_width == mp->m_swidth)
- return 0;
- error = xfs_check_new_dalign(mp, mp->m_dalign, &update_sb);
- if (error || !update_sb)
- return error;
- sbp->sb_unit = mp->m_dalign;
- sbp->sb_width = mp->m_swidth;
- mp->m_update_sb = true;
- } else if ((mp->m_flags & XFS_MOUNT_NOALIGN) != XFS_MOUNT_NOALIGN &&
- xfs_sb_version_hasdalign(&mp->m_sb)) {
- mp->m_dalign = sbp->sb_unit;
- mp->m_swidth = sbp->sb_width;
- }
- return 0;
- }
- /*
- * precalculate the low space thresholds for dynamic speculative preallocation.
- */
- void
- xfs_set_low_space_thresholds(
- struct xfs_mount *mp)
- {
- int i;
- for (i = 0; i < XFS_LOWSP_MAX; i++) {
- uint64_t space = mp->m_sb.sb_dblocks;
- do_div(space, 100);
- mp->m_low_space[i] = space * (i + 1);
- }
- }
- /*
- * Check that the data (and log if separate) is an ok size.
- */
- STATIC int
- xfs_check_sizes(
- struct xfs_mount *mp)
- {
- struct xfs_buf *bp;
- xfs_daddr_t d;
- int error;
- d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks);
- if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_dblocks) {
- xfs_warn(mp, "filesystem size mismatch detected");
- return -EFBIG;
- }
- error = xfs_buf_read_uncached(mp->m_ddev_targp,
- d - XFS_FSS_TO_BB(mp, 1),
- XFS_FSS_TO_BB(mp, 1), 0, &bp, NULL);
- if (error) {
- xfs_warn(mp, "last sector read failed");
- return error;
- }
- xfs_buf_relse(bp);
- if (mp->m_logdev_targp == mp->m_ddev_targp)
- return 0;
- d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks);
- if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_logblocks) {
- xfs_warn(mp, "log size mismatch detected");
- return -EFBIG;
- }
- error = xfs_buf_read_uncached(mp->m_logdev_targp,
- d - XFS_FSB_TO_BB(mp, 1),
- XFS_FSB_TO_BB(mp, 1), 0, &bp, NULL);
- if (error) {
- xfs_warn(mp, "log device read failed");
- return error;
- }
- xfs_buf_relse(bp);
- return 0;
- }
- /*
- * Clear the quotaflags in memory and in the superblock.
- */
- int
- xfs_mount_reset_sbqflags(
- struct xfs_mount *mp)
- {
- mp->m_qflags = 0;
- /* It is OK to look at sb_qflags in the mount path without m_sb_lock. */
- if (mp->m_sb.sb_qflags == 0)
- return 0;
- spin_lock(&mp->m_sb_lock);
- mp->m_sb.sb_qflags = 0;
- spin_unlock(&mp->m_sb_lock);
- if (!xfs_fs_writable(mp, SB_FREEZE_WRITE))
- return 0;
- return xfs_sync_sb(mp, false);
- }
- uint64_t
- xfs_default_resblks(xfs_mount_t *mp)
- {
- uint64_t resblks;
- /*
- * We default to 5% or 8192 fsbs of space reserved, whichever is
- * smaller. This is intended to cover concurrent allocation
- * transactions when we initially hit enospc. These each require a 4
- * block reservation. Hence by default we cover roughly 2000 concurrent
- * allocation reservations.
- */
- resblks = mp->m_sb.sb_dblocks;
- do_div(resblks, 20);
- resblks = min_t(uint64_t, resblks, 8192);
- return resblks;
- }
- /* Ensure the summary counts are correct. */
- STATIC int
- xfs_check_summary_counts(
- struct xfs_mount *mp)
- {
- /*
- * The AG0 superblock verifier rejects in-progress filesystems,
- * so we should never see the flag set this far into mounting.
- */
- if (mp->m_sb.sb_inprogress) {
- xfs_err(mp, "sb_inprogress set after log recovery??");
- WARN_ON(1);
- return -EFSCORRUPTED;
- }
- /*
- * Now the log is mounted, we know if it was an unclean shutdown or
- * not. If it was, with the first phase of recovery has completed, we
- * have consistent AG blocks on disk. We have not recovered EFIs yet,
- * but they are recovered transactionally in the second recovery phase
- * later.
- *
- * If the log was clean when we mounted, we can check the summary
- * counters. If any of them are obviously incorrect, we can recompute
- * them from the AGF headers in the next step.
- */
- if (XFS_LAST_UNMOUNT_WAS_CLEAN(mp) &&
- (mp->m_sb.sb_fdblocks > mp->m_sb.sb_dblocks ||
- !xfs_verify_icount(mp, mp->m_sb.sb_icount) ||
- mp->m_sb.sb_ifree > mp->m_sb.sb_icount))
- xfs_fs_mark_sick(mp, XFS_SICK_FS_COUNTERS);
- /*
- * We can safely re-initialise incore superblock counters from the
- * per-ag data. These may not be correct if the filesystem was not
- * cleanly unmounted, so we waited for recovery to finish before doing
- * this.
- *
- * If the filesystem was cleanly unmounted or the previous check did
- * not flag anything weird, then we can trust the values in the
- * superblock to be correct and we don't need to do anything here.
- * Otherwise, recalculate the summary counters.
- */
- if ((!xfs_sb_version_haslazysbcount(&mp->m_sb) ||
- XFS_LAST_UNMOUNT_WAS_CLEAN(mp)) &&
- !xfs_fs_has_sickness(mp, XFS_SICK_FS_COUNTERS))
- return 0;
- return xfs_initialize_perag_data(mp, mp->m_sb.sb_agcount);
- }
- /*
- * This function does the following on an initial mount of a file system:
- * - reads the superblock from disk and init the mount struct
- * - if we're a 32-bit kernel, do a size check on the superblock
- * so we don't mount terabyte filesystems
- * - init mount struct realtime fields
- * - allocate inode hash table for fs
- * - init directory manager
- * - perform recovery and init the log manager
- */
- int
- xfs_mountfs(
- struct xfs_mount *mp)
- {
- struct xfs_sb *sbp = &(mp->m_sb);
- struct xfs_inode *rip;
- struct xfs_ino_geometry *igeo = M_IGEO(mp);
- uint64_t resblks;
- uint quotamount = 0;
- uint quotaflags = 0;
- int error = 0;
- xfs_sb_mount_common(mp, sbp);
- /*
- * Check for a mismatched features2 values. Older kernels read & wrote
- * into the wrong sb offset for sb_features2 on some platforms due to
- * xfs_sb_t not being 64bit size aligned when sb_features2 was added,
- * which made older superblock reading/writing routines swap it as a
- * 64-bit value.
- *
- * For backwards compatibility, we make both slots equal.
- *
- * If we detect a mismatched field, we OR the set bits into the existing
- * features2 field in case it has already been modified; we don't want
- * to lose any features. We then update the bad location with the ORed
- * value so that older kernels will see any features2 flags. The
- * superblock writeback code ensures the new sb_features2 is copied to
- * sb_bad_features2 before it is logged or written to disk.
- */
- if (xfs_sb_has_mismatched_features2(sbp)) {
- xfs_warn(mp, "correcting sb_features alignment problem");
- sbp->sb_features2 |= sbp->sb_bad_features2;
- mp->m_update_sb = true;
- /*
- * Re-check for ATTR2 in case it was found in bad_features2
- * slot.
- */
- if (xfs_sb_version_hasattr2(&mp->m_sb) &&
- !(mp->m_flags & XFS_MOUNT_NOATTR2))
- mp->m_flags |= XFS_MOUNT_ATTR2;
- }
- if (xfs_sb_version_hasattr2(&mp->m_sb) &&
- (mp->m_flags & XFS_MOUNT_NOATTR2)) {
- xfs_sb_version_removeattr2(&mp->m_sb);
- mp->m_update_sb = true;
- /* update sb_versionnum for the clearing of the morebits */
- if (!sbp->sb_features2)
- mp->m_update_sb = true;
- }
- /* always use v2 inodes by default now */
- if (!(mp->m_sb.sb_versionnum & XFS_SB_VERSION_NLINKBIT)) {
- mp->m_sb.sb_versionnum |= XFS_SB_VERSION_NLINKBIT;
- mp->m_update_sb = true;
- }
- /*
- * If we were given new sunit/swidth options, do some basic validation
- * checks and convert the incore dalign and swidth values to the
- * same units (FSB) that everything else uses. This /must/ happen
- * before computing the inode geometry.
- */
- error = xfs_validate_new_dalign(mp);
- if (error)
- goto out;
- xfs_alloc_compute_maxlevels(mp);
- xfs_bmap_compute_maxlevels(mp, XFS_DATA_FORK);
- xfs_bmap_compute_maxlevels(mp, XFS_ATTR_FORK);
- xfs_ialloc_setup_geometry(mp);
- xfs_rmapbt_compute_maxlevels(mp);
- xfs_refcountbt_compute_maxlevels(mp);
- /*
- * Check if sb_agblocks is aligned at stripe boundary. If sb_agblocks
- * is NOT aligned turn off m_dalign since allocator alignment is within
- * an ag, therefore ag has to be aligned at stripe boundary. Note that
- * we must compute the free space and rmap btree geometry before doing
- * this.
- */
- error = xfs_update_alignment(mp);
- if (error)
- goto out;
- /* enable fail_at_unmount as default */
- mp->m_fail_unmount = true;
- error = xfs_sysfs_init(&mp->m_kobj, &xfs_mp_ktype,
- NULL, mp->m_super->s_id);
- if (error)
- goto out;
- error = xfs_sysfs_init(&mp->m_stats.xs_kobj, &xfs_stats_ktype,
- &mp->m_kobj, "stats");
- if (error)
- goto out_remove_sysfs;
- error = xfs_error_sysfs_init(mp);
- if (error)
- goto out_del_stats;
- error = xfs_errortag_init(mp);
- if (error)
- goto out_remove_error_sysfs;
- error = xfs_uuid_mount(mp);
- if (error)
- goto out_remove_errortag;
- /*
- * Update the preferred write size based on the information from the
- * on-disk superblock.
- */
- mp->m_allocsize_log =
- max_t(uint32_t, sbp->sb_blocklog, mp->m_allocsize_log);
- mp->m_allocsize_blocks = 1U << (mp->m_allocsize_log - sbp->sb_blocklog);
- /* set the low space thresholds for dynamic preallocation */
- xfs_set_low_space_thresholds(mp);
- /*
- * If enabled, sparse inode chunk alignment is expected to match the
- * cluster size. Full inode chunk alignment must match the chunk size,
- * but that is checked on sb read verification...
- */
- if (xfs_sb_version_hassparseinodes(&mp->m_sb) &&
- mp->m_sb.sb_spino_align !=
- XFS_B_TO_FSBT(mp, igeo->inode_cluster_size_raw)) {
- xfs_warn(mp,
- "Sparse inode block alignment (%u) must match cluster size (%llu).",
- mp->m_sb.sb_spino_align,
- XFS_B_TO_FSBT(mp, igeo->inode_cluster_size_raw));
- error = -EINVAL;
- goto out_remove_uuid;
- }
- /*
- * Check that the data (and log if separate) is an ok size.
- */
- error = xfs_check_sizes(mp);
- if (error)
- goto out_remove_uuid;
- /*
- * Initialize realtime fields in the mount structure
- */
- error = xfs_rtmount_init(mp);
- if (error) {
- xfs_warn(mp, "RT mount failed");
- goto out_remove_uuid;
- }
- /*
- * Copies the low order bits of the timestamp and the randomly
- * set "sequence" number out of a UUID.
- */
- mp->m_fixedfsid[0] =
- (get_unaligned_be16(&sbp->sb_uuid.b[8]) << 16) |
- get_unaligned_be16(&sbp->sb_uuid.b[4]);
- mp->m_fixedfsid[1] = get_unaligned_be32(&sbp->sb_uuid.b[0]);
- error = xfs_da_mount(mp);
- if (error) {
- xfs_warn(mp, "Failed dir/attr init: %d", error);
- goto out_remove_uuid;
- }
- /*
- * Initialize the precomputed transaction reservations values.
- */
- xfs_trans_init(mp);
- /*
- * Allocate and initialize the per-ag data.
- */
- error = xfs_initialize_perag(mp, sbp->sb_agcount, &mp->m_maxagi);
- if (error) {
- xfs_warn(mp, "Failed per-ag init: %d", error);
- goto out_free_dir;
- }
- if (XFS_IS_CORRUPT(mp, !sbp->sb_logblocks)) {
- xfs_warn(mp, "no log defined");
- error = -EFSCORRUPTED;
- goto out_free_perag;
- }
- /*
- * Log's mount-time initialization. The first part of recovery can place
- * some items on the AIL, to be handled when recovery is finished or
- * cancelled.
- */
- error = xfs_log_mount(mp, mp->m_logdev_targp,
- XFS_FSB_TO_DADDR(mp, sbp->sb_logstart),
- XFS_FSB_TO_BB(mp, sbp->sb_logblocks));
- if (error) {
- xfs_warn(mp, "log mount failed");
- goto out_fail_wait;
- }
- /* Make sure the summary counts are ok. */
- error = xfs_check_summary_counts(mp);
- if (error)
- goto out_log_dealloc;
- /*
- * Get and sanity-check the root inode.
- * Save the pointer to it in the mount structure.
- */
- error = xfs_iget(mp, NULL, sbp->sb_rootino, XFS_IGET_UNTRUSTED,
- XFS_ILOCK_EXCL, &rip);
- if (error) {
- xfs_warn(mp,
- "Failed to read root inode 0x%llx, error %d",
- sbp->sb_rootino, -error);
- goto out_log_dealloc;
- }
- ASSERT(rip != NULL);
- if (XFS_IS_CORRUPT(mp, !S_ISDIR(VFS_I(rip)->i_mode))) {
- xfs_warn(mp, "corrupted root inode %llu: not a directory",
- (unsigned long long)rip->i_ino);
- xfs_iunlock(rip, XFS_ILOCK_EXCL);
- error = -EFSCORRUPTED;
- goto out_rele_rip;
- }
- mp->m_rootip = rip; /* save it */
- xfs_iunlock(rip, XFS_ILOCK_EXCL);
- /*
- * Initialize realtime inode pointers in the mount structure
- */
- error = xfs_rtmount_inodes(mp);
- if (error) {
- /*
- * Free up the root inode.
- */
- xfs_warn(mp, "failed to read RT inodes");
- goto out_rele_rip;
- }
- /*
- * If this is a read-only mount defer the superblock updates until
- * the next remount into writeable mode. Otherwise we would never
- * perform the update e.g. for the root filesystem.
- */
- if (mp->m_update_sb && !(mp->m_flags & XFS_MOUNT_RDONLY)) {
- error = xfs_sync_sb(mp, false);
- if (error) {
- xfs_warn(mp, "failed to write sb changes");
- goto out_rtunmount;
- }
- }
- /*
- * Initialise the XFS quota management subsystem for this mount
- */
- if (XFS_IS_QUOTA_RUNNING(mp)) {
- error = xfs_qm_newmount(mp, "amount, "aflags);
- if (error)
- goto out_rtunmount;
- } else {
- ASSERT(!XFS_IS_QUOTA_ON(mp));
- /*
- * If a file system had quotas running earlier, but decided to
- * mount without -o uquota/pquota/gquota options, revoke the
- * quotachecked license.
- */
- if (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT) {
- xfs_notice(mp, "resetting quota flags");
- error = xfs_mount_reset_sbqflags(mp);
- if (error)
- goto out_rtunmount;
- }
- }
- /*
- * Finish recovering the file system. This part needed to be delayed
- * until after the root and real-time bitmap inodes were consistently
- * read in.
- */
- error = xfs_log_mount_finish(mp);
- if (error) {
- xfs_warn(mp, "log mount finish failed");
- goto out_rtunmount;
- }
- /*
- * Now the log is fully replayed, we can transition to full read-only
- * mode for read-only mounts. This will sync all the metadata and clean
- * the log so that the recovery we just performed does not have to be
- * replayed again on the next mount.
- *
- * We use the same quiesce mechanism as the rw->ro remount, as they are
- * semantically identical operations.
- */
- if ((mp->m_flags & (XFS_MOUNT_RDONLY|XFS_MOUNT_NORECOVERY)) ==
- XFS_MOUNT_RDONLY) {
- xfs_quiesce_attr(mp);
- }
- /*
- * Complete the quota initialisation, post-log-replay component.
- */
- if (quotamount) {
- ASSERT(mp->m_qflags == 0);
- mp->m_qflags = quotaflags;
- xfs_qm_mount_quotas(mp);
- }
- /*
- * Now we are mounted, reserve a small amount of unused space for
- * privileged transactions. This is needed so that transaction
- * space required for critical operations can dip into this pool
- * when at ENOSPC. This is needed for operations like create with
- * attr, unwritten extent conversion at ENOSPC, etc. Data allocations
- * are not allowed to use this reserved space.
- *
- * This may drive us straight to ENOSPC on mount, but that implies
- * we were already there on the last unmount. Warn if this occurs.
- */
- if (!(mp->m_flags & XFS_MOUNT_RDONLY)) {
- resblks = xfs_default_resblks(mp);
- error = xfs_reserve_blocks(mp, &resblks, NULL);
- if (error)
- xfs_warn(mp,
- "Unable to allocate reserve blocks. Continuing without reserve pool.");
- /* Recover any CoW blocks that never got remapped. */
- error = xfs_reflink_recover_cow(mp);
- if (error) {
- xfs_err(mp,
- "Error %d recovering leftover CoW allocations.", error);
- xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
- goto out_quota;
- }
- /* Reserve AG blocks for future btree expansion. */
- error = xfs_fs_reserve_ag_blocks(mp);
- if (error && error != -ENOSPC)
- goto out_agresv;
- }
- return 0;
- out_agresv:
- xfs_fs_unreserve_ag_blocks(mp);
- out_quota:
- xfs_qm_unmount_quotas(mp);
- out_rtunmount:
- xfs_rtunmount_inodes(mp);
- out_rele_rip:
- xfs_irele(rip);
- /* Clean out dquots that might be in memory after quotacheck. */
- xfs_qm_unmount(mp);
- /*
- * Cancel all delayed reclaim work and reclaim the inodes directly.
- * We have to do this /after/ rtunmount and qm_unmount because those
- * two will have scheduled delayed reclaim for the rt/quota inodes.
- *
- * This is slightly different from the unmountfs call sequence
- * because we could be tearing down a partially set up mount. In
- * particular, if log_mount_finish fails we bail out without calling
- * qm_unmount_quotas and therefore rely on qm_unmount to release the
- * quota inodes.
- */
- cancel_delayed_work_sync(&mp->m_reclaim_work);
- xfs_reclaim_inodes(mp);
- xfs_health_unmount(mp);
- out_log_dealloc:
- mp->m_flags |= XFS_MOUNT_UNMOUNTING;
- xfs_log_mount_cancel(mp);
- out_fail_wait:
- if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp)
- xfs_wait_buftarg(mp->m_logdev_targp);
- xfs_wait_buftarg(mp->m_ddev_targp);
- out_free_perag:
- xfs_free_perag(mp);
- out_free_dir:
- xfs_da_unmount(mp);
- out_remove_uuid:
- xfs_uuid_unmount(mp);
- out_remove_errortag:
- xfs_errortag_del(mp);
- out_remove_error_sysfs:
- xfs_error_sysfs_del(mp);
- out_del_stats:
- xfs_sysfs_del(&mp->m_stats.xs_kobj);
- out_remove_sysfs:
- xfs_sysfs_del(&mp->m_kobj);
- out:
- return error;
- }
- /*
- * This flushes out the inodes,dquots and the superblock, unmounts the
- * log and makes sure that incore structures are freed.
- */
- void
- xfs_unmountfs(
- struct xfs_mount *mp)
- {
- uint64_t resblks;
- int error;
- xfs_stop_block_reaping(mp);
- xfs_fs_unreserve_ag_blocks(mp);
- xfs_qm_unmount_quotas(mp);
- xfs_rtunmount_inodes(mp);
- xfs_irele(mp->m_rootip);
- /*
- * We can potentially deadlock here if we have an inode cluster
- * that has been freed has its buffer still pinned in memory because
- * the transaction is still sitting in a iclog. The stale inodes
- * on that buffer will be pinned to the buffer until the
- * transaction hits the disk and the callbacks run. Pushing the AIL will
- * skip the stale inodes and may never see the pinned buffer, so
- * nothing will push out the iclog and unpin the buffer. Hence we
- * need to force the log here to ensure all items are flushed into the
- * AIL before we go any further.
- */
- xfs_log_force(mp, XFS_LOG_SYNC);
- /*
- * Wait for all busy extents to be freed, including completion of
- * any discard operation.
- */
- xfs_extent_busy_wait_all(mp);
- flush_workqueue(xfs_discard_wq);
- /*
- * We now need to tell the world we are unmounting. This will allow
- * us to detect that the filesystem is going away and we should error
- * out anything that we have been retrying in the background. This will
- * prevent neverending retries in AIL pushing from hanging the unmount.
- */
- mp->m_flags |= XFS_MOUNT_UNMOUNTING;
- /*
- * Flush all pending changes from the AIL.
- */
- xfs_ail_push_all_sync(mp->m_ail);
- /*
- * Reclaim all inodes. At this point there should be no dirty inodes and
- * none should be pinned or locked. Stop background inode reclaim here
- * if it is still running.
- */
- cancel_delayed_work_sync(&mp->m_reclaim_work);
- xfs_reclaim_inodes(mp);
- xfs_health_unmount(mp);
- xfs_qm_unmount(mp);
- /*
- * Unreserve any blocks we have so that when we unmount we don't account
- * the reserved free space as used. This is really only necessary for
- * lazy superblock counting because it trusts the incore superblock
- * counters to be absolutely correct on clean unmount.
- *
- * We don't bother correcting this elsewhere for lazy superblock
- * counting because on mount of an unclean filesystem we reconstruct the
- * correct counter value and this is irrelevant.
- *
- * For non-lazy counter filesystems, this doesn't matter at all because
- * we only every apply deltas to the superblock and hence the incore
- * value does not matter....
- */
- resblks = 0;
- error = xfs_reserve_blocks(mp, &resblks, NULL);
- if (error)
- xfs_warn(mp, "Unable to free reserved block pool. "
- "Freespace may not be correct on next mount.");
- error = xfs_log_sbcount(mp);
- if (error)
- xfs_warn(mp, "Unable to update superblock counters. "
- "Freespace may not be correct on next mount.");
- xfs_log_unmount(mp);
- xfs_da_unmount(mp);
- xfs_uuid_unmount(mp);
- #if defined(DEBUG)
- xfs_errortag_clearall(mp);
- #endif
- xfs_free_perag(mp);
- xfs_errortag_del(mp);
- xfs_error_sysfs_del(mp);
- xfs_sysfs_del(&mp->m_stats.xs_kobj);
- xfs_sysfs_del(&mp->m_kobj);
- }
- /*
- * Determine whether modifications can proceed. The caller specifies the minimum
- * freeze level for which modifications should not be allowed. This allows
- * certain operations to proceed while the freeze sequence is in progress, if
- * necessary.
- */
- bool
- xfs_fs_writable(
- struct xfs_mount *mp,
- int level)
- {
- ASSERT(level > SB_UNFROZEN);
- if ((mp->m_super->s_writers.frozen >= level) ||
- XFS_FORCED_SHUTDOWN(mp) || (mp->m_flags & XFS_MOUNT_RDONLY))
- return false;
- return true;
- }
- /*
- * xfs_log_sbcount
- *
- * Sync the superblock counters to disk.
- *
- * Note this code can be called during the process of freezing, so we use the
- * transaction allocator that does not block when the transaction subsystem is
- * in its frozen state.
- */
- int
- xfs_log_sbcount(xfs_mount_t *mp)
- {
- /* allow this to proceed during the freeze sequence... */
- if (!xfs_fs_writable(mp, SB_FREEZE_COMPLETE))
- return 0;
- /*
- * we don't need to do this if we are updating the superblock
- * counters on every modification.
- */
- if (!xfs_sb_version_haslazysbcount(&mp->m_sb))
- return 0;
- return xfs_sync_sb(mp, true);
- }
- /*
- * Deltas for the block count can vary from 1 to very large, but lock contention
- * only occurs on frequent small block count updates such as in the delayed
- * allocation path for buffered writes (page a time updates). Hence we set
- * a large batch count (1024) to minimise global counter updates except when
- * we get near to ENOSPC and we have to be very accurate with our updates.
- */
- #define XFS_FDBLOCKS_BATCH 1024
- int
- xfs_mod_fdblocks(
- struct xfs_mount *mp,
- int64_t delta,
- bool rsvd)
- {
- int64_t lcounter;
- long long res_used;
- s32 batch;
- if (delta > 0) {
- /*
- * If the reserve pool is depleted, put blocks back into it
- * first. Most of the time the pool is full.
- */
- if (likely(mp->m_resblks == mp->m_resblks_avail)) {
- percpu_counter_add(&mp->m_fdblocks, delta);
- return 0;
- }
- spin_lock(&mp->m_sb_lock);
- res_used = (long long)(mp->m_resblks - mp->m_resblks_avail);
- if (res_used > delta) {
- mp->m_resblks_avail += delta;
- } else {
- delta -= res_used;
- mp->m_resblks_avail = mp->m_resblks;
- percpu_counter_add(&mp->m_fdblocks, delta);
- }
- spin_unlock(&mp->m_sb_lock);
- return 0;
- }
- /*
- * Taking blocks away, need to be more accurate the closer we
- * are to zero.
- *
- * If the counter has a value of less than 2 * max batch size,
- * then make everything serialise as we are real close to
- * ENOSPC.
- */
- if (__percpu_counter_compare(&mp->m_fdblocks, 2 * XFS_FDBLOCKS_BATCH,
- XFS_FDBLOCKS_BATCH) < 0)
- batch = 1;
- else
- batch = XFS_FDBLOCKS_BATCH;
- percpu_counter_add_batch(&mp->m_fdblocks, delta, batch);
- if (__percpu_counter_compare(&mp->m_fdblocks, mp->m_alloc_set_aside,
- XFS_FDBLOCKS_BATCH) >= 0) {
- /* we had space! */
- return 0;
- }
- /*
- * lock up the sb for dipping into reserves before releasing the space
- * that took us to ENOSPC.
- */
- spin_lock(&mp->m_sb_lock);
- percpu_counter_add(&mp->m_fdblocks, -delta);
- if (!rsvd)
- goto fdblocks_enospc;
- lcounter = (long long)mp->m_resblks_avail + delta;
- if (lcounter >= 0) {
- mp->m_resblks_avail = lcounter;
- spin_unlock(&mp->m_sb_lock);
- return 0;
- }
- xfs_warn_once(mp,
- "Reserve blocks depleted! Consider increasing reserve pool size.");
- fdblocks_enospc:
- spin_unlock(&mp->m_sb_lock);
- return -ENOSPC;
- }
- int
- xfs_mod_frextents(
- struct xfs_mount *mp,
- int64_t delta)
- {
- int64_t lcounter;
- int ret = 0;
- spin_lock(&mp->m_sb_lock);
- lcounter = mp->m_sb.sb_frextents + delta;
- if (lcounter < 0)
- ret = -ENOSPC;
- else
- mp->m_sb.sb_frextents = lcounter;
- spin_unlock(&mp->m_sb_lock);
- return ret;
- }
- /*
- * Used to free the superblock along various error paths.
- */
- void
- xfs_freesb(
- struct xfs_mount *mp)
- {
- struct xfs_buf *bp = mp->m_sb_bp;
- xfs_buf_lock(bp);
- mp->m_sb_bp = NULL;
- xfs_buf_relse(bp);
- }
- /*
- * If the underlying (data/log/rt) device is readonly, there are some
- * operations that cannot proceed.
- */
- int
- xfs_dev_is_read_only(
- struct xfs_mount *mp,
- char *message)
- {
- if (xfs_readonly_buftarg(mp->m_ddev_targp) ||
- xfs_readonly_buftarg(mp->m_logdev_targp) ||
- (mp->m_rtdev_targp && xfs_readonly_buftarg(mp->m_rtdev_targp))) {
- xfs_notice(mp, "%s required on read-only device.", message);
- xfs_notice(mp, "write access unavailable, cannot proceed.");
- return -EROFS;
- }
- return 0;
- }
- /* Force the summary counters to be recalculated at next mount. */
- void
- xfs_force_summary_recalc(
- struct xfs_mount *mp)
- {
- if (!xfs_sb_version_haslazysbcount(&mp->m_sb))
- return;
- xfs_fs_mark_sick(mp, XFS_SICK_FS_COUNTERS);
- }
- /*
- * Update the in-core delayed block counter.
- *
- * We prefer to update the counter without having to take a spinlock for every
- * counter update (i.e. batching). Each change to delayed allocation
- * reservations can change can easily exceed the default percpu counter
- * batching, so we use a larger batch factor here.
- *
- * Note that we don't currently have any callers requiring fast summation
- * (e.g. percpu_counter_read) so we can use a big batch value here.
- */
- #define XFS_DELALLOC_BATCH (4096)
- void
- xfs_mod_delalloc(
- struct xfs_mount *mp,
- int64_t delta)
- {
- percpu_counter_add_batch(&mp->m_delalloc_blks, delta,
- XFS_DELALLOC_BATCH);
- }
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