Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1409 insertions, 0 deletions

diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
new file mode 100644
index 000000000..0a0fd1957
--- /dev/null
+++ b/fs/xfs/xfs_mount.c
@@ -0,0 +1,1409 @@
+// 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_log_priv.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"
+#include "xfs_ag.h"
+#include "scrub/stats.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 (xfs_has_nouuid(mp))
+		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 (xfs_has_nouuid(mp))
+		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);
+}
+
+/*
+ * 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;
+}
+
+/*
+ * 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;
+	}
+
+	mp->m_features |= xfs_sb_version_to_features(sbp);
+	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;
+	}
+
+	/*
+	 * 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;
+	}
+
+	if (!mp->m_dalign) {
+		xfs_warn(mp,
+	"alignment check failed: sunit(%d) less than bsize(%d)",
+			mp->m_dalign, mp->m_sb.sb_blocksize);
+		return -EINVAL;
+	}
+
+	mp->m_swidth = XFS_BB_TO_FSBT(mp, mp->m_swidth);
+
+	if (!xfs_has_dalign(mp)) {
+		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 (!xfs_has_noalign(mp) && xfs_has_dalign(mp)) {
+		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)
+{
+	uint64_t		dblocks = mp->m_sb.sb_dblocks;
+	uint64_t		rtexts = mp->m_sb.sb_rextents;
+	int			i;
+
+	do_div(dblocks, 100);
+	do_div(rtexts, 100);
+
+	for (i = 0; i < XFS_LOWSP_MAX; i++) {
+		mp->m_low_space[i] = dblocks * (i + 1);
+		mp->m_low_rtexts[i] = rtexts * (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)
+{
+	int			error = 0;
+
+	/*
+	 * 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_is_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_has_lazysbcount(mp) && !xfs_is_clean(mp)) ||
+	    xfs_fs_has_sickness(mp, XFS_SICK_FS_COUNTERS)) {
+		error = xfs_initialize_perag_data(mp, mp->m_sb.sb_agcount);
+		if (error)
+			return error;
+	}
+
+	/*
+	 * Older kernels misused sb_frextents to reflect both incore
+	 * reservations made by running transactions and the actual count of
+	 * free rt extents in the ondisk metadata.  Transactions committed
+	 * during runtime can therefore contain a superblock update that
+	 * undercounts the number of free rt extents tracked in the rt bitmap.
+	 * A clean unmount record will have the correct frextents value since
+	 * there can be no other transactions running at that point.
+	 *
+	 * If we're mounting the rt volume after recovering the log, recompute
+	 * frextents from the rtbitmap file to fix the inconsistency.
+	 */
+	if (xfs_has_realtime(mp) && !xfs_is_clean(mp)) {
+		error = xfs_rtalloc_reinit_frextents(mp);
+		if (error)
+			return error;
+	}
+
+	return 0;
+}
+
+static void
+xfs_unmount_check(
+	struct xfs_mount	*mp)
+{
+	if (xfs_is_shutdown(mp))
+		return;
+
+	if (percpu_counter_sum(&mp->m_ifree) >
+			percpu_counter_sum(&mp->m_icount)) {
+		xfs_alert(mp, "ifree/icount mismatch at unmount");
+		xfs_fs_mark_sick(mp, XFS_SICK_FS_COUNTERS);
+	}
+}
+
+/*
+ * Flush and reclaim dirty inodes in preparation for unmount. Inodes and
+ * internal inode structures can be sitting in the CIL and AIL at this point,
+ * so we need to unpin them, write them back and/or reclaim them before unmount
+ * can proceed.  In other words, callers are required to have inactivated all
+ * inodes.
+ *
+ * An inode cluster that has been freed can have 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 to unpin everything first. However, log
+ * forces don't wait for the discards they issue to complete, so we have to
+ * explicitly wait for them to complete here as well.
+ *
+ * Then we can tell the world we are unmounting so that error handling knows
+ * that the filesystem is going away and we should error out anything that we
+ * have been retrying in the background.  This will prevent never-ending
+ * retries in AIL pushing from hanging the unmount.
+ *
+ * Finally, we can push the AIL to clean all the remaining dirty objects, then
+ * reclaim the remaining inodes that are still in memory at this point in time.
+ */
+static void
+xfs_unmount_flush_inodes(
+	struct xfs_mount	*mp)
+{
+	xfs_log_force(mp, XFS_LOG_SYNC);
+	xfs_extent_busy_wait_all(mp);
+	flush_workqueue(xfs_discard_wq);
+
+	set_bit(XFS_OPSTATE_UNMOUNTING, &mp->m_opstate);
+
+	xfs_ail_push_all_sync(mp->m_ail);
+	xfs_inodegc_stop(mp);
+	cancel_delayed_work_sync(&mp->m_reclaim_work);
+	xfs_reclaim_inodes(mp);
+	xfs_health_unmount(mp);
+}
+
+static void
+xfs_mount_setup_inode_geom(
+	struct xfs_mount	*mp)
+{
+	struct xfs_ino_geometry *igeo = M_IGEO(mp);
+
+	igeo->attr_fork_offset = xfs_bmap_compute_attr_offset(mp);
+	ASSERT(igeo->attr_fork_offset < XFS_LITINO(mp));
+
+	xfs_ialloc_setup_geometry(mp);
+}
+
+/* Compute maximum possible height for per-AG btree types for this fs. */
+static inline void
+xfs_agbtree_compute_maxlevels(
+	struct xfs_mount	*mp)
+{
+	unsigned int		levels;
+
+	levels = max(mp->m_alloc_maxlevels, M_IGEO(mp)->inobt_maxlevels);
+	levels = max(levels, mp->m_rmap_maxlevels);
+	mp->m_agbtree_maxlevels = max(levels, mp->m_refc_maxlevels);
+}
+
+/*
+ * 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;
+	}
+
+
+	/* 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_features |= XFS_FEAT_NLINK;
+		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_mount_setup_inode_geom(mp);
+	xfs_rmapbt_compute_maxlevels(mp);
+	xfs_refcountbt_compute_maxlevels(mp);
+
+	xfs_agbtree_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;
+
+	xchk_stats_register(mp->m_scrub_stats, mp->m_debugfs);
+
+	error = xfs_error_sysfs_init(mp);
+	if (error)
+		goto out_remove_scrub_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_has_sparseinodes(mp) &&
+	    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_sb.sb_dblocks,
+			&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;
+	}
+
+	error = xfs_inodegc_register_shrinker(mp);
+	if (error)
+		goto out_fail_wait;
+
+	/*
+	 * 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_inodegc_shrinker;
+	}
+
+	/* Enable background inode inactivation workers. */
+	xfs_inodegc_start(mp);
+	xfs_blockgc_start(mp);
+
+	/*
+	 * Now that we've recovered any pending superblock feature bit
+	 * additions, we can finish setting up the attr2 behaviour for the
+	 * mount. The noattr2 option overrides the superblock flag, so only
+	 * check the superblock feature flag if the mount option is not set.
+	 */
+	if (xfs_has_noattr2(mp)) {
+		mp->m_features &= ~XFS_FEAT_ATTR2;
+	} else if (!xfs_has_attr2(mp) &&
+		   (mp->m_sb.sb_features2 & XFS_SB_VERSION2_ATTR2BIT)) {
+		mp->m_features |= XFS_FEAT_ATTR2;
+	}
+
+	/*
+	 * 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;
+	}
+
+	/* Make sure the summary counts are ok. */
+	error = xfs_check_summary_counts(mp);
+	if (error)
+		goto out_rtunmount;
+
+	/*
+	 * 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 && !xfs_is_readonly(mp)) {
+		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_ON(mp)) {
+		error = xfs_qm_newmount(mp, &quotamount, &quotaflags);
+		if (error)
+			goto out_rtunmount;
+	} else {
+		/*
+		 * 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.  Temporarily create per-AG space reservations for metadata
+	 * btree shape changes because space freeing transactions (for inode
+	 * inactivation) require the per-AG reservation in lieu of reserving
+	 * blocks.
+	 */
+	error = xfs_fs_reserve_ag_blocks(mp);
+	if (error && error == -ENOSPC)
+		xfs_warn(mp,
+	"ENOSPC reserving per-AG metadata pool, log recovery may fail.");
+	error = xfs_log_mount_finish(mp);
+	xfs_fs_unreserve_ag_blocks(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 (xfs_is_readonly(mp) && !xfs_has_norecovery(mp))
+		xfs_log_clean(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 (!xfs_is_readonly(mp)) {
+		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.");
+
+		/* 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);
+	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);
+
+	/*
+	 * Inactivate all inodes that might still be in memory after a log
+	 * intent recovery failure so that reclaim can free them.  Metadata
+	 * inodes and the root directory shouldn't need inactivation, but the
+	 * mount failed for some reason, so pull down all the state and flee.
+	 */
+	xfs_inodegc_flush(mp);
+
+	/*
+	 * Flush all inode reclamation work and flush the log.
+	 * 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.
+	 */
+	xfs_unmount_flush_inodes(mp);
+ out_log_dealloc:
+	xfs_log_mount_cancel(mp);
+ out_inodegc_shrinker:
+	unregister_shrinker(&mp->m_inodegc_shrinker);
+ out_fail_wait:
+	if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp)
+		xfs_buftarg_drain(mp->m_logdev_targp);
+	xfs_buftarg_drain(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_remove_scrub_stats:
+	xchk_stats_unregister(mp->m_scrub_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;
+
+	/*
+	 * Perform all on-disk metadata updates required to inactivate inodes
+	 * that the VFS evicted earlier in the unmount process.  Freeing inodes
+	 * and discarding CoW fork preallocations can cause shape changes to
+	 * the free inode and refcount btrees, respectively, so we must finish
+	 * this before we discard the metadata space reservations.  Metadata
+	 * inodes and the root directory do not require inactivation.
+	 */
+	xfs_inodegc_flush(mp);
+
+	xfs_blockgc_stop(mp);
+	xfs_fs_unreserve_ag_blocks(mp);
+	xfs_qm_unmount_quotas(mp);
+	xfs_rtunmount_inodes(mp);
+	xfs_irele(mp->m_rootip);
+
+	xfs_unmount_flush_inodes(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.");
+	xfs_unmount_check(mp);
+
+	xfs_log_unmount(mp);
+	xfs_da_unmount(mp);
+	xfs_uuid_unmount(mp);
+
+#if defined(DEBUG)
+	xfs_errortag_clearall(mp);
+#endif
+	unregister_shrinker(&mp->m_inodegc_shrinker);
+	xfs_free_perag(mp);
+
+	xfs_errortag_del(mp);
+	xfs_error_sysfs_del(mp);
+	xchk_stats_unregister(mp->m_scrub_stats);
+	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_is_shutdown(mp) || xfs_is_readonly(mp))
+		return false;
+
+	return true;
+}
+
+/* Adjust m_fdblocks or m_frextents. */
+int
+xfs_mod_freecounter(
+	struct xfs_mount	*mp,
+	struct percpu_counter	*counter,
+	int64_t			delta,
+	bool			rsvd)
+{
+	int64_t			lcounter;
+	long long		res_used;
+	uint64_t		set_aside = 0;
+	s32			batch;
+	bool			has_resv_pool;
+
+	ASSERT(counter == &mp->m_fdblocks || counter == &mp->m_frextents);
+	has_resv_pool = (counter == &mp->m_fdblocks);
+	if (rsvd)
+		ASSERT(has_resv_pool);
+
+	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(!has_resv_pool ||
+			   mp->m_resblks == mp->m_resblks_avail)) {
+			percpu_counter_add(counter, 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(counter, 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(counter, 2 * XFS_FDBLOCKS_BATCH,
+				     XFS_FDBLOCKS_BATCH) < 0)
+		batch = 1;
+	else
+		batch = XFS_FDBLOCKS_BATCH;
+
+	/*
+	 * Set aside allocbt blocks because these blocks are tracked as free
+	 * space but not available for allocation. Technically this means that a
+	 * single reservation cannot consume all remaining free space, but the
+	 * ratio of allocbt blocks to usable free blocks should be rather small.
+	 * The tradeoff without this is that filesystems that maintain high
+	 * perag block reservations can over reserve physical block availability
+	 * and fail physical allocation, which leads to much more serious
+	 * problems (i.e. transaction abort, pagecache discards, etc.) than
+	 * slightly premature -ENOSPC.
+	 */
+	if (has_resv_pool)
+		set_aside = xfs_fdblocks_unavailable(mp);
+	percpu_counter_add_batch(counter, delta, batch);
+	if (__percpu_counter_compare(counter, 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(counter, -delta);
+	if (!has_resv_pool || !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;
+}
+
+/*
+ * 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_has_lazysbcount(mp))
+		return;
+
+	xfs_fs_mark_sick(mp, XFS_SICK_FS_COUNTERS);
+}
+
+/*
+ * Enable a log incompat feature flag in the primary superblock.  The caller
+ * cannot have any other transactions in progress.
+ */
+int
+xfs_add_incompat_log_feature(
+	struct xfs_mount	*mp,
+	uint32_t		feature)
+{
+	struct xfs_dsb		*dsb;
+	int			error;
+
+	ASSERT(hweight32(feature) == 1);
+	ASSERT(!(feature & XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN));
+
+	/*
+	 * Force the log to disk and kick the background AIL thread to reduce
+	 * the chances that the bwrite will stall waiting for the AIL to unpin
+	 * the primary superblock buffer.  This isn't a data integrity
+	 * operation, so we don't need a synchronous push.
+	 */
+	error = xfs_log_force(mp, XFS_LOG_SYNC);
+	if (error)
+		return error;
+	xfs_ail_push_all(mp->m_ail);
+
+	/*
+	 * Lock the primary superblock buffer to serialize all callers that
+	 * are trying to set feature bits.
+	 */
+	xfs_buf_lock(mp->m_sb_bp);
+	xfs_buf_hold(mp->m_sb_bp);
+
+	if (xfs_is_shutdown(mp)) {
+		error = -EIO;
+		goto rele;
+	}
+
+	if (xfs_sb_has_incompat_log_feature(&mp->m_sb, feature))
+		goto rele;
+
+	/*
+	 * Write the primary superblock to disk immediately, because we need
+	 * the log_incompat bit to be set in the primary super now to protect
+	 * the log items that we're going to commit later.
+	 */
+	dsb = mp->m_sb_bp->b_addr;
+	xfs_sb_to_disk(dsb, &mp->m_sb);
+	dsb->sb_features_log_incompat |= cpu_to_be32(feature);
+	error = xfs_bwrite(mp->m_sb_bp);
+	if (error)
+		goto shutdown;
+
+	/*
+	 * Add the feature bits to the incore superblock before we unlock the
+	 * buffer.
+	 */
+	xfs_sb_add_incompat_log_features(&mp->m_sb, feature);
+	xfs_buf_relse(mp->m_sb_bp);
+
+	/* Log the superblock to disk. */
+	return xfs_sync_sb(mp, false);
+shutdown:
+	xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR);
+rele:
+	xfs_buf_relse(mp->m_sb_bp);
+	return error;
+}
+
+/*
+ * Clear all the log incompat flags from the superblock.
+ *
+ * The caller cannot be in a transaction, must ensure that the log does not
+ * contain any log items protected by any log incompat bit, and must ensure
+ * that there are no other threads that depend on the state of the log incompat
+ * feature flags in the primary super.
+ *
+ * Returns true if the superblock is dirty.
+ */
+bool
+xfs_clear_incompat_log_features(
+	struct xfs_mount	*mp)
+{
+	bool			ret = false;
+
+	if (!xfs_has_crc(mp) ||
+	    !xfs_sb_has_incompat_log_feature(&mp->m_sb,
+				XFS_SB_FEAT_INCOMPAT_LOG_ALL) ||
+	    xfs_is_shutdown(mp))
+		return false;
+
+	/*
+	 * Update the incore superblock.  We synchronize on the primary super
+	 * buffer lock to be consistent with the add function, though at least
+	 * in theory this shouldn't be necessary.
+	 */
+	xfs_buf_lock(mp->m_sb_bp);
+	xfs_buf_hold(mp->m_sb_bp);
+
+	if (xfs_sb_has_incompat_log_feature(&mp->m_sb,
+				XFS_SB_FEAT_INCOMPAT_LOG_ALL)) {
+		xfs_sb_remove_incompat_log_features(&mp->m_sb);
+		ret = true;
+	}
+
+	xfs_buf_relse(mp->m_sb_bp);
+	return ret;
+}
+
+/*
+ * 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);
+}