Adding upstream version 6.6.15.upstream/6.6.15

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

1 files changed, 2436 insertions, 0 deletions

diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
new file mode 100644
index 000000000..13007b6bc
--- /dev/null
+++ b/fs/xfs/xfs_super.c
@@ -0,0 +1,2436 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2000-2006 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ */
+
+#include "xfs.h"
+#include "xfs_shared.h"
+#include "xfs_format.h"
+#include "xfs_log_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_sb.h"
+#include "xfs_mount.h"
+#include "xfs_inode.h"
+#include "xfs_btree.h"
+#include "xfs_bmap.h"
+#include "xfs_alloc.h"
+#include "xfs_fsops.h"
+#include "xfs_trans.h"
+#include "xfs_buf_item.h"
+#include "xfs_log.h"
+#include "xfs_log_priv.h"
+#include "xfs_dir2.h"
+#include "xfs_extfree_item.h"
+#include "xfs_mru_cache.h"
+#include "xfs_inode_item.h"
+#include "xfs_icache.h"
+#include "xfs_trace.h"
+#include "xfs_icreate_item.h"
+#include "xfs_filestream.h"
+#include "xfs_quota.h"
+#include "xfs_sysfs.h"
+#include "xfs_ondisk.h"
+#include "xfs_rmap_item.h"
+#include "xfs_refcount_item.h"
+#include "xfs_bmap_item.h"
+#include "xfs_reflink.h"
+#include "xfs_pwork.h"
+#include "xfs_ag.h"
+#include "xfs_defer.h"
+#include "xfs_attr_item.h"
+#include "xfs_xattr.h"
+#include "xfs_iunlink_item.h"
+#include "xfs_dahash_test.h"
+#include "scrub/stats.h"
+
+#include <linux/magic.h>
+#include <linux/fs_context.h>
+#include <linux/fs_parser.h>
+
+static const struct super_operations xfs_super_operations;
+
+static struct dentry *xfs_debugfs;	/* top-level xfs debugfs dir */
+static struct kset *xfs_kset;		/* top-level xfs sysfs dir */
+#ifdef DEBUG
+static struct xfs_kobj xfs_dbg_kobj;	/* global debug sysfs attrs */
+#endif
+
+enum xfs_dax_mode {
+	XFS_DAX_INODE = 0,
+	XFS_DAX_ALWAYS = 1,
+	XFS_DAX_NEVER = 2,
+};
+
+static void
+xfs_mount_set_dax_mode(
+	struct xfs_mount	*mp,
+	enum xfs_dax_mode	mode)
+{
+	switch (mode) {
+	case XFS_DAX_INODE:
+		mp->m_features &= ~(XFS_FEAT_DAX_ALWAYS | XFS_FEAT_DAX_NEVER);
+		break;
+	case XFS_DAX_ALWAYS:
+		mp->m_features |= XFS_FEAT_DAX_ALWAYS;
+		mp->m_features &= ~XFS_FEAT_DAX_NEVER;
+		break;
+	case XFS_DAX_NEVER:
+		mp->m_features |= XFS_FEAT_DAX_NEVER;
+		mp->m_features &= ~XFS_FEAT_DAX_ALWAYS;
+		break;
+	}
+}
+
+static const struct constant_table dax_param_enums[] = {
+	{"inode",	XFS_DAX_INODE },
+	{"always",	XFS_DAX_ALWAYS },
+	{"never",	XFS_DAX_NEVER },
+	{}
+};
+
+/*
+ * Table driven mount option parser.
+ */
+enum {
+	Opt_logbufs, Opt_logbsize, Opt_logdev, Opt_rtdev,
+	Opt_wsync, Opt_noalign, Opt_swalloc, Opt_sunit, Opt_swidth, Opt_nouuid,
+	Opt_grpid, Opt_nogrpid, Opt_bsdgroups, Opt_sysvgroups,
+	Opt_allocsize, Opt_norecovery, Opt_inode64, Opt_inode32, Opt_ikeep,
+	Opt_noikeep, Opt_largeio, Opt_nolargeio, Opt_attr2, Opt_noattr2,
+	Opt_filestreams, Opt_quota, Opt_noquota, Opt_usrquota, Opt_grpquota,
+	Opt_prjquota, Opt_uquota, Opt_gquota, Opt_pquota,
+	Opt_uqnoenforce, Opt_gqnoenforce, Opt_pqnoenforce, Opt_qnoenforce,
+	Opt_discard, Opt_nodiscard, Opt_dax, Opt_dax_enum,
+};
+
+static const struct fs_parameter_spec xfs_fs_parameters[] = {
+	fsparam_u32("logbufs",		Opt_logbufs),
+	fsparam_string("logbsize",	Opt_logbsize),
+	fsparam_string("logdev",	Opt_logdev),
+	fsparam_string("rtdev",		Opt_rtdev),
+	fsparam_flag("wsync",		Opt_wsync),
+	fsparam_flag("noalign",		Opt_noalign),
+	fsparam_flag("swalloc",		Opt_swalloc),
+	fsparam_u32("sunit",		Opt_sunit),
+	fsparam_u32("swidth",		Opt_swidth),
+	fsparam_flag("nouuid",		Opt_nouuid),
+	fsparam_flag("grpid",		Opt_grpid),
+	fsparam_flag("nogrpid",		Opt_nogrpid),
+	fsparam_flag("bsdgroups",	Opt_bsdgroups),
+	fsparam_flag("sysvgroups",	Opt_sysvgroups),
+	fsparam_string("allocsize",	Opt_allocsize),
+	fsparam_flag("norecovery",	Opt_norecovery),
+	fsparam_flag("inode64",		Opt_inode64),
+	fsparam_flag("inode32",		Opt_inode32),
+	fsparam_flag("ikeep",		Opt_ikeep),
+	fsparam_flag("noikeep",		Opt_noikeep),
+	fsparam_flag("largeio",		Opt_largeio),
+	fsparam_flag("nolargeio",	Opt_nolargeio),
+	fsparam_flag("attr2",		Opt_attr2),
+	fsparam_flag("noattr2",		Opt_noattr2),
+	fsparam_flag("filestreams",	Opt_filestreams),
+	fsparam_flag("quota",		Opt_quota),
+	fsparam_flag("noquota",		Opt_noquota),
+	fsparam_flag("usrquota",	Opt_usrquota),
+	fsparam_flag("grpquota",	Opt_grpquota),
+	fsparam_flag("prjquota",	Opt_prjquota),
+	fsparam_flag("uquota",		Opt_uquota),
+	fsparam_flag("gquota",		Opt_gquota),
+	fsparam_flag("pquota",		Opt_pquota),
+	fsparam_flag("uqnoenforce",	Opt_uqnoenforce),
+	fsparam_flag("gqnoenforce",	Opt_gqnoenforce),
+	fsparam_flag("pqnoenforce",	Opt_pqnoenforce),
+	fsparam_flag("qnoenforce",	Opt_qnoenforce),
+	fsparam_flag("discard",		Opt_discard),
+	fsparam_flag("nodiscard",	Opt_nodiscard),
+	fsparam_flag("dax",		Opt_dax),
+	fsparam_enum("dax",		Opt_dax_enum, dax_param_enums),
+	{}
+};
+
+struct proc_xfs_info {
+	uint64_t	flag;
+	char		*str;
+};
+
+static int
+xfs_fs_show_options(
+	struct seq_file		*m,
+	struct dentry		*root)
+{
+	static struct proc_xfs_info xfs_info_set[] = {
+		/* the few simple ones we can get from the mount struct */
+		{ XFS_FEAT_IKEEP,		",ikeep" },
+		{ XFS_FEAT_WSYNC,		",wsync" },
+		{ XFS_FEAT_NOALIGN,		",noalign" },
+		{ XFS_FEAT_SWALLOC,		",swalloc" },
+		{ XFS_FEAT_NOUUID,		",nouuid" },
+		{ XFS_FEAT_NORECOVERY,		",norecovery" },
+		{ XFS_FEAT_ATTR2,		",attr2" },
+		{ XFS_FEAT_FILESTREAMS,		",filestreams" },
+		{ XFS_FEAT_GRPID,		",grpid" },
+		{ XFS_FEAT_DISCARD,		",discard" },
+		{ XFS_FEAT_LARGE_IOSIZE,	",largeio" },
+		{ XFS_FEAT_DAX_ALWAYS,		",dax=always" },
+		{ XFS_FEAT_DAX_NEVER,		",dax=never" },
+		{ 0, NULL }
+	};
+	struct xfs_mount	*mp = XFS_M(root->d_sb);
+	struct proc_xfs_info	*xfs_infop;
+
+	for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
+		if (mp->m_features & xfs_infop->flag)
+			seq_puts(m, xfs_infop->str);
+	}
+
+	seq_printf(m, ",inode%d", xfs_has_small_inums(mp) ? 32 : 64);
+
+	if (xfs_has_allocsize(mp))
+		seq_printf(m, ",allocsize=%dk",
+			   (1 << mp->m_allocsize_log) >> 10);
+
+	if (mp->m_logbufs > 0)
+		seq_printf(m, ",logbufs=%d", mp->m_logbufs);
+	if (mp->m_logbsize > 0)
+		seq_printf(m, ",logbsize=%dk", mp->m_logbsize >> 10);
+
+	if (mp->m_logname)
+		seq_show_option(m, "logdev", mp->m_logname);
+	if (mp->m_rtname)
+		seq_show_option(m, "rtdev", mp->m_rtname);
+
+	if (mp->m_dalign > 0)
+		seq_printf(m, ",sunit=%d",
+				(int)XFS_FSB_TO_BB(mp, mp->m_dalign));
+	if (mp->m_swidth > 0)
+		seq_printf(m, ",swidth=%d",
+				(int)XFS_FSB_TO_BB(mp, mp->m_swidth));
+
+	if (mp->m_qflags & XFS_UQUOTA_ENFD)
+		seq_puts(m, ",usrquota");
+	else if (mp->m_qflags & XFS_UQUOTA_ACCT)
+		seq_puts(m, ",uqnoenforce");
+
+	if (mp->m_qflags & XFS_PQUOTA_ENFD)
+		seq_puts(m, ",prjquota");
+	else if (mp->m_qflags & XFS_PQUOTA_ACCT)
+		seq_puts(m, ",pqnoenforce");
+
+	if (mp->m_qflags & XFS_GQUOTA_ENFD)
+		seq_puts(m, ",grpquota");
+	else if (mp->m_qflags & XFS_GQUOTA_ACCT)
+		seq_puts(m, ",gqnoenforce");
+
+	if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
+		seq_puts(m, ",noquota");
+
+	return 0;
+}
+
+static bool
+xfs_set_inode_alloc_perag(
+	struct xfs_perag	*pag,
+	xfs_ino_t		ino,
+	xfs_agnumber_t		max_metadata)
+{
+	if (!xfs_is_inode32(pag->pag_mount)) {
+		set_bit(XFS_AGSTATE_ALLOWS_INODES, &pag->pag_opstate);
+		clear_bit(XFS_AGSTATE_PREFERS_METADATA, &pag->pag_opstate);
+		return false;
+	}
+
+	if (ino > XFS_MAXINUMBER_32) {
+		clear_bit(XFS_AGSTATE_ALLOWS_INODES, &pag->pag_opstate);
+		clear_bit(XFS_AGSTATE_PREFERS_METADATA, &pag->pag_opstate);
+		return false;
+	}
+
+	set_bit(XFS_AGSTATE_ALLOWS_INODES, &pag->pag_opstate);
+	if (pag->pag_agno < max_metadata)
+		set_bit(XFS_AGSTATE_PREFERS_METADATA, &pag->pag_opstate);
+	else
+		clear_bit(XFS_AGSTATE_PREFERS_METADATA, &pag->pag_opstate);
+	return true;
+}
+
+/*
+ * Set parameters for inode allocation heuristics, taking into account
+ * filesystem size and inode32/inode64 mount options; i.e. specifically
+ * whether or not XFS_FEAT_SMALL_INUMS is set.
+ *
+ * Inode allocation patterns are altered only if inode32 is requested
+ * (XFS_FEAT_SMALL_INUMS), and the filesystem is sufficiently large.
+ * If altered, XFS_OPSTATE_INODE32 is set as well.
+ *
+ * An agcount independent of that in the mount structure is provided
+ * because in the growfs case, mp->m_sb.sb_agcount is not yet updated
+ * to the potentially higher ag count.
+ *
+ * Returns the maximum AG index which may contain inodes.
+ */
+xfs_agnumber_t
+xfs_set_inode_alloc(
+	struct xfs_mount *mp,
+	xfs_agnumber_t	agcount)
+{
+	xfs_agnumber_t	index;
+	xfs_agnumber_t	maxagi = 0;
+	xfs_sb_t	*sbp = &mp->m_sb;
+	xfs_agnumber_t	max_metadata;
+	xfs_agino_t	agino;
+	xfs_ino_t	ino;
+
+	/*
+	 * Calculate how much should be reserved for inodes to meet
+	 * the max inode percentage.  Used only for inode32.
+	 */
+	if (M_IGEO(mp)->maxicount) {
+		uint64_t	icount;
+
+		icount = sbp->sb_dblocks * sbp->sb_imax_pct;
+		do_div(icount, 100);
+		icount += sbp->sb_agblocks - 1;
+		do_div(icount, sbp->sb_agblocks);
+		max_metadata = icount;
+	} else {
+		max_metadata = agcount;
+	}
+
+	/* Get the last possible inode in the filesystem */
+	agino =	XFS_AGB_TO_AGINO(mp, sbp->sb_agblocks - 1);
+	ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
+
+	/*
+	 * If user asked for no more than 32-bit inodes, and the fs is
+	 * sufficiently large, set XFS_OPSTATE_INODE32 if we must alter
+	 * the allocator to accommodate the request.
+	 */
+	if (xfs_has_small_inums(mp) && ino > XFS_MAXINUMBER_32)
+		set_bit(XFS_OPSTATE_INODE32, &mp->m_opstate);
+	else
+		clear_bit(XFS_OPSTATE_INODE32, &mp->m_opstate);
+
+	for (index = 0; index < agcount; index++) {
+		struct xfs_perag	*pag;
+
+		ino = XFS_AGINO_TO_INO(mp, index, agino);
+
+		pag = xfs_perag_get(mp, index);
+		if (xfs_set_inode_alloc_perag(pag, ino, max_metadata))
+			maxagi++;
+		xfs_perag_put(pag);
+	}
+
+	return xfs_is_inode32(mp) ? maxagi : agcount;
+}
+
+static int
+xfs_setup_dax_always(
+	struct xfs_mount	*mp)
+{
+	if (!mp->m_ddev_targp->bt_daxdev &&
+	    (!mp->m_rtdev_targp || !mp->m_rtdev_targp->bt_daxdev)) {
+		xfs_alert(mp,
+			"DAX unsupported by block device. Turning off DAX.");
+		goto disable_dax;
+	}
+
+	if (mp->m_super->s_blocksize != PAGE_SIZE) {
+		xfs_alert(mp,
+			"DAX not supported for blocksize. Turning off DAX.");
+		goto disable_dax;
+	}
+
+	if (xfs_has_reflink(mp) &&
+	    bdev_is_partition(mp->m_ddev_targp->bt_bdev)) {
+		xfs_alert(mp,
+			"DAX and reflink cannot work with multi-partitions!");
+		return -EINVAL;
+	}
+
+	xfs_warn(mp, "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
+	return 0;
+
+disable_dax:
+	xfs_mount_set_dax_mode(mp, XFS_DAX_NEVER);
+	return 0;
+}
+
+STATIC int
+xfs_blkdev_get(
+	xfs_mount_t		*mp,
+	const char		*name,
+	struct block_device	**bdevp)
+{
+	int			error = 0;
+
+	*bdevp = blkdev_get_by_path(name, BLK_OPEN_READ | BLK_OPEN_WRITE,
+				    mp->m_super, &fs_holder_ops);
+	if (IS_ERR(*bdevp)) {
+		error = PTR_ERR(*bdevp);
+		xfs_warn(mp, "Invalid device [%s], error=%d", name, error);
+	}
+
+	return error;
+}
+
+STATIC void
+xfs_shutdown_devices(
+	struct xfs_mount	*mp)
+{
+	/*
+	 * Udev is triggered whenever anyone closes a block device or unmounts
+	 * a file systemm on a block device.
+	 * The default udev rules invoke blkid to read the fs super and create
+	 * symlinks to the bdev under /dev/disk.  For this, it uses buffered
+	 * reads through the page cache.
+	 *
+	 * xfs_db also uses buffered reads to examine metadata.  There is no
+	 * coordination between xfs_db and udev, which means that they can run
+	 * concurrently.  Note there is no coordination between the kernel and
+	 * blkid either.
+	 *
+	 * On a system with 64k pages, the page cache can cache the superblock
+	 * and the root inode (and hence the root directory) with the same 64k
+	 * page.  If udev spawns blkid after the mkfs and the system is busy
+	 * enough that it is still running when xfs_db starts up, they'll both
+	 * read from the same page in the pagecache.
+	 *
+	 * The unmount writes updated inode metadata to disk directly.  The XFS
+	 * buffer cache does not use the bdev pagecache, so it needs to
+	 * invalidate that pagecache on unmount.  If the above scenario occurs,
+	 * the pagecache no longer reflects what's on disk, xfs_db reads the
+	 * stale metadata, and fails to find /a.  Most of the time this succeeds
+	 * because closing a bdev invalidates the page cache, but when processes
+	 * race, everyone loses.
+	 */
+	if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
+		blkdev_issue_flush(mp->m_logdev_targp->bt_bdev);
+		invalidate_bdev(mp->m_logdev_targp->bt_bdev);
+	}
+	if (mp->m_rtdev_targp) {
+		blkdev_issue_flush(mp->m_rtdev_targp->bt_bdev);
+		invalidate_bdev(mp->m_rtdev_targp->bt_bdev);
+	}
+	blkdev_issue_flush(mp->m_ddev_targp->bt_bdev);
+	invalidate_bdev(mp->m_ddev_targp->bt_bdev);
+}
+
+/*
+ * The file system configurations are:
+ *	(1) device (partition) with data and internal log
+ *	(2) logical volume with data and log subvolumes.
+ *	(3) logical volume with data, log, and realtime subvolumes.
+ *
+ * We only have to handle opening the log and realtime volumes here if
+ * they are present.  The data subvolume has already been opened by
+ * get_sb_bdev() and is stored in sb->s_bdev.
+ */
+STATIC int
+xfs_open_devices(
+	struct xfs_mount	*mp)
+{
+	struct super_block	*sb = mp->m_super;
+	struct block_device	*ddev = sb->s_bdev;
+	struct block_device	*logdev = NULL, *rtdev = NULL;
+	int			error;
+
+	/*
+	 * blkdev_put() can't be called under s_umount, see the comment
+	 * in get_tree_bdev() for more details
+	 */
+	up_write(&sb->s_umount);
+
+	/*
+	 * Open real time and log devices - order is important.
+	 */
+	if (mp->m_logname) {
+		error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
+		if (error)
+			goto out_relock;
+	}
+
+	if (mp->m_rtname) {
+		error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
+		if (error)
+			goto out_close_logdev;
+
+		if (rtdev == ddev || rtdev == logdev) {
+			xfs_warn(mp,
+	"Cannot mount filesystem with identical rtdev and ddev/logdev.");
+			error = -EINVAL;
+			goto out_close_rtdev;
+		}
+	}
+
+	/*
+	 * Setup xfs_mount buffer target pointers
+	 */
+	error = -ENOMEM;
+	mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev);
+	if (!mp->m_ddev_targp)
+		goto out_close_rtdev;
+
+	if (rtdev) {
+		mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev);
+		if (!mp->m_rtdev_targp)
+			goto out_free_ddev_targ;
+	}
+
+	if (logdev && logdev != ddev) {
+		mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev);
+		if (!mp->m_logdev_targp)
+			goto out_free_rtdev_targ;
+	} else {
+		mp->m_logdev_targp = mp->m_ddev_targp;
+	}
+
+	error = 0;
+out_relock:
+	down_write(&sb->s_umount);
+	return error;
+
+ out_free_rtdev_targ:
+	if (mp->m_rtdev_targp)
+		xfs_free_buftarg(mp->m_rtdev_targp);
+ out_free_ddev_targ:
+	xfs_free_buftarg(mp->m_ddev_targp);
+ out_close_rtdev:
+	 if (rtdev)
+		 blkdev_put(rtdev, sb);
+ out_close_logdev:
+	if (logdev && logdev != ddev)
+		blkdev_put(logdev, sb);
+	goto out_relock;
+}
+
+/*
+ * Setup xfs_mount buffer target pointers based on superblock
+ */
+STATIC int
+xfs_setup_devices(
+	struct xfs_mount	*mp)
+{
+	int			error;
+
+	error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize);
+	if (error)
+		return error;
+
+	if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
+		unsigned int	log_sector_size = BBSIZE;
+
+		if (xfs_has_sector(mp))
+			log_sector_size = mp->m_sb.sb_logsectsize;
+		error = xfs_setsize_buftarg(mp->m_logdev_targp,
+					    log_sector_size);
+		if (error)
+			return error;
+	}
+	if (mp->m_rtdev_targp) {
+		error = xfs_setsize_buftarg(mp->m_rtdev_targp,
+					    mp->m_sb.sb_sectsize);
+		if (error)
+			return error;
+	}
+
+	return 0;
+}
+
+STATIC int
+xfs_init_mount_workqueues(
+	struct xfs_mount	*mp)
+{
+	mp->m_buf_workqueue = alloc_workqueue("xfs-buf/%s",
+			XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM),
+			1, mp->m_super->s_id);
+	if (!mp->m_buf_workqueue)
+		goto out;
+
+	mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
+			XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM),
+			0, mp->m_super->s_id);
+	if (!mp->m_unwritten_workqueue)
+		goto out_destroy_buf;
+
+	mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
+			XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM),
+			0, mp->m_super->s_id);
+	if (!mp->m_reclaim_workqueue)
+		goto out_destroy_unwritten;
+
+	mp->m_blockgc_wq = alloc_workqueue("xfs-blockgc/%s",
+			XFS_WQFLAGS(WQ_UNBOUND | WQ_FREEZABLE | WQ_MEM_RECLAIM),
+			0, mp->m_super->s_id);
+	if (!mp->m_blockgc_wq)
+		goto out_destroy_reclaim;
+
+	mp->m_inodegc_wq = alloc_workqueue("xfs-inodegc/%s",
+			XFS_WQFLAGS(WQ_FREEZABLE | WQ_MEM_RECLAIM),
+			1, mp->m_super->s_id);
+	if (!mp->m_inodegc_wq)
+		goto out_destroy_blockgc;
+
+	mp->m_sync_workqueue = alloc_workqueue("xfs-sync/%s",
+			XFS_WQFLAGS(WQ_FREEZABLE), 0, mp->m_super->s_id);
+	if (!mp->m_sync_workqueue)
+		goto out_destroy_inodegc;
+
+	return 0;
+
+out_destroy_inodegc:
+	destroy_workqueue(mp->m_inodegc_wq);
+out_destroy_blockgc:
+	destroy_workqueue(mp->m_blockgc_wq);
+out_destroy_reclaim:
+	destroy_workqueue(mp->m_reclaim_workqueue);
+out_destroy_unwritten:
+	destroy_workqueue(mp->m_unwritten_workqueue);
+out_destroy_buf:
+	destroy_workqueue(mp->m_buf_workqueue);
+out:
+	return -ENOMEM;
+}
+
+STATIC void
+xfs_destroy_mount_workqueues(
+	struct xfs_mount	*mp)
+{
+	destroy_workqueue(mp->m_sync_workqueue);
+	destroy_workqueue(mp->m_blockgc_wq);
+	destroy_workqueue(mp->m_inodegc_wq);
+	destroy_workqueue(mp->m_reclaim_workqueue);
+	destroy_workqueue(mp->m_unwritten_workqueue);
+	destroy_workqueue(mp->m_buf_workqueue);
+}
+
+static void
+xfs_flush_inodes_worker(
+	struct work_struct	*work)
+{
+	struct xfs_mount	*mp = container_of(work, struct xfs_mount,
+						   m_flush_inodes_work);
+	struct super_block	*sb = mp->m_super;
+
+	if (down_read_trylock(&sb->s_umount)) {
+		sync_inodes_sb(sb);
+		up_read(&sb->s_umount);
+	}
+}
+
+/*
+ * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
+ * or a page lock. We use sync_inodes_sb() here to ensure we block while waiting
+ * for IO to complete so that we effectively throttle multiple callers to the
+ * rate at which IO is completing.
+ */
+void
+xfs_flush_inodes(
+	struct xfs_mount	*mp)
+{
+	/*
+	 * If flush_work() returns true then that means we waited for a flush
+	 * which was already in progress.  Don't bother running another scan.
+	 */
+	if (flush_work(&mp->m_flush_inodes_work))
+		return;
+
+	queue_work(mp->m_sync_workqueue, &mp->m_flush_inodes_work);
+	flush_work(&mp->m_flush_inodes_work);
+}
+
+/* Catch misguided souls that try to use this interface on XFS */
+STATIC struct inode *
+xfs_fs_alloc_inode(
+	struct super_block	*sb)
+{
+	BUG();
+	return NULL;
+}
+
+/*
+ * Now that the generic code is guaranteed not to be accessing
+ * the linux inode, we can inactivate and reclaim the inode.
+ */
+STATIC void
+xfs_fs_destroy_inode(
+	struct inode		*inode)
+{
+	struct xfs_inode	*ip = XFS_I(inode);
+
+	trace_xfs_destroy_inode(ip);
+
+	ASSERT(!rwsem_is_locked(&inode->i_rwsem));
+	XFS_STATS_INC(ip->i_mount, vn_rele);
+	XFS_STATS_INC(ip->i_mount, vn_remove);
+	xfs_inode_mark_reclaimable(ip);
+}
+
+static void
+xfs_fs_dirty_inode(
+	struct inode			*inode,
+	int				flags)
+{
+	struct xfs_inode		*ip = XFS_I(inode);
+	struct xfs_mount		*mp = ip->i_mount;
+	struct xfs_trans		*tp;
+
+	if (!(inode->i_sb->s_flags & SB_LAZYTIME))
+		return;
+
+	/*
+	 * Only do the timestamp update if the inode is dirty (I_DIRTY_SYNC)
+	 * and has dirty timestamp (I_DIRTY_TIME). I_DIRTY_TIME can be passed
+	 * in flags possibly together with I_DIRTY_SYNC.
+	 */
+	if ((flags & ~I_DIRTY_TIME) != I_DIRTY_SYNC || !(flags & I_DIRTY_TIME))
+		return;
+
+	if (xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp))
+		return;
+	xfs_ilock(ip, XFS_ILOCK_EXCL);
+	xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
+	xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP);
+	xfs_trans_commit(tp);
+}
+
+/*
+ * Slab object creation initialisation for the XFS inode.
+ * This covers only the idempotent fields in the XFS inode;
+ * all other fields need to be initialised on allocation
+ * from the slab. This avoids the need to repeatedly initialise
+ * fields in the xfs inode that left in the initialise state
+ * when freeing the inode.
+ */
+STATIC void
+xfs_fs_inode_init_once(
+	void			*inode)
+{
+	struct xfs_inode	*ip = inode;
+
+	memset(ip, 0, sizeof(struct xfs_inode));
+
+	/* vfs inode */
+	inode_init_once(VFS_I(ip));
+
+	/* xfs inode */
+	atomic_set(&ip->i_pincount, 0);
+	spin_lock_init(&ip->i_flags_lock);
+
+	mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
+		     "xfsino", ip->i_ino);
+}
+
+/*
+ * We do an unlocked check for XFS_IDONTCACHE here because we are already
+ * serialised against cache hits here via the inode->i_lock and igrab() in
+ * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be
+ * racing with us, and it avoids needing to grab a spinlock here for every inode
+ * we drop the final reference on.
+ */
+STATIC int
+xfs_fs_drop_inode(
+	struct inode		*inode)
+{
+	struct xfs_inode	*ip = XFS_I(inode);
+
+	/*
+	 * If this unlinked inode is in the middle of recovery, don't
+	 * drop the inode just yet; log recovery will take care of
+	 * that.  See the comment for this inode flag.
+	 */
+	if (ip->i_flags & XFS_IRECOVERY) {
+		ASSERT(xlog_recovery_needed(ip->i_mount->m_log));
+		return 0;
+	}
+
+	return generic_drop_inode(inode);
+}
+
+static void
+xfs_mount_free(
+	struct xfs_mount	*mp)
+{
+	/*
+	 * Free the buftargs here because blkdev_put needs to be called outside
+	 * of sb->s_umount, which is held around the call to ->put_super.
+	 */
+	if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp)
+		xfs_free_buftarg(mp->m_logdev_targp);
+	if (mp->m_rtdev_targp)
+		xfs_free_buftarg(mp->m_rtdev_targp);
+	if (mp->m_ddev_targp)
+		xfs_free_buftarg(mp->m_ddev_targp);
+
+	debugfs_remove(mp->m_debugfs);
+	kfree(mp->m_rtname);
+	kfree(mp->m_logname);
+	kmem_free(mp);
+}
+
+STATIC int
+xfs_fs_sync_fs(
+	struct super_block	*sb,
+	int			wait)
+{
+	struct xfs_mount	*mp = XFS_M(sb);
+	int			error;
+
+	trace_xfs_fs_sync_fs(mp, __return_address);
+
+	/*
+	 * Doing anything during the async pass would be counterproductive.
+	 */
+	if (!wait)
+		return 0;
+
+	error = xfs_log_force(mp, XFS_LOG_SYNC);
+	if (error)
+		return error;
+
+	if (laptop_mode) {
+		/*
+		 * The disk must be active because we're syncing.
+		 * We schedule log work now (now that the disk is
+		 * active) instead of later (when it might not be).
+		 */
+		flush_delayed_work(&mp->m_log->l_work);
+	}
+
+	/*
+	 * If we are called with page faults frozen out, it means we are about
+	 * to freeze the transaction subsystem. Take the opportunity to shut
+	 * down inodegc because once SB_FREEZE_FS is set it's too late to
+	 * prevent inactivation races with freeze. The fs doesn't get called
+	 * again by the freezing process until after SB_FREEZE_FS has been set,
+	 * so it's now or never.  Same logic applies to speculative allocation
+	 * garbage collection.
+	 *
+	 * We don't care if this is a normal syncfs call that does this or
+	 * freeze that does this - we can run this multiple times without issue
+	 * and we won't race with a restart because a restart can only occur
+	 * when the state is either SB_FREEZE_FS or SB_FREEZE_COMPLETE.
+	 */
+	if (sb->s_writers.frozen == SB_FREEZE_PAGEFAULT) {
+		xfs_inodegc_stop(mp);
+		xfs_blockgc_stop(mp);
+	}
+
+	return 0;
+}
+
+STATIC int
+xfs_fs_statfs(
+	struct dentry		*dentry,
+	struct kstatfs		*statp)
+{
+	struct xfs_mount	*mp = XFS_M(dentry->d_sb);
+	xfs_sb_t		*sbp = &mp->m_sb;
+	struct xfs_inode	*ip = XFS_I(d_inode(dentry));
+	uint64_t		fakeinos, id;
+	uint64_t		icount;
+	uint64_t		ifree;
+	uint64_t		fdblocks;
+	xfs_extlen_t		lsize;
+	int64_t			ffree;
+
+	/*
+	 * Expedite background inodegc but don't wait. We do not want to block
+	 * here waiting hours for a billion extent file to be truncated.
+	 */
+	xfs_inodegc_push(mp);
+
+	statp->f_type = XFS_SUPER_MAGIC;
+	statp->f_namelen = MAXNAMELEN - 1;
+
+	id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
+	statp->f_fsid = u64_to_fsid(id);
+
+	icount = percpu_counter_sum(&mp->m_icount);
+	ifree = percpu_counter_sum(&mp->m_ifree);
+	fdblocks = percpu_counter_sum(&mp->m_fdblocks);
+
+	spin_lock(&mp->m_sb_lock);
+	statp->f_bsize = sbp->sb_blocksize;
+	lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
+	statp->f_blocks = sbp->sb_dblocks - lsize;
+	spin_unlock(&mp->m_sb_lock);
+
+	/* make sure statp->f_bfree does not underflow */
+	statp->f_bfree = max_t(int64_t, 0,
+				fdblocks - xfs_fdblocks_unavailable(mp));
+	statp->f_bavail = statp->f_bfree;
+
+	fakeinos = XFS_FSB_TO_INO(mp, statp->f_bfree);
+	statp->f_files = min(icount + fakeinos, (uint64_t)XFS_MAXINUMBER);
+	if (M_IGEO(mp)->maxicount)
+		statp->f_files = min_t(typeof(statp->f_files),
+					statp->f_files,
+					M_IGEO(mp)->maxicount);
+
+	/* If sb_icount overshot maxicount, report actual allocation */
+	statp->f_files = max_t(typeof(statp->f_files),
+					statp->f_files,
+					sbp->sb_icount);
+
+	/* make sure statp->f_ffree does not underflow */
+	ffree = statp->f_files - (icount - ifree);
+	statp->f_ffree = max_t(int64_t, ffree, 0);
+
+
+	if ((ip->i_diflags & XFS_DIFLAG_PROJINHERIT) &&
+	    ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
+			      (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
+		xfs_qm_statvfs(ip, statp);
+
+	if (XFS_IS_REALTIME_MOUNT(mp) &&
+	    (ip->i_diflags & (XFS_DIFLAG_RTINHERIT | XFS_DIFLAG_REALTIME))) {
+		s64	freertx;
+
+		statp->f_blocks = sbp->sb_rblocks;
+		freertx = percpu_counter_sum_positive(&mp->m_frextents);
+		statp->f_bavail = statp->f_bfree = freertx * sbp->sb_rextsize;
+	}
+
+	return 0;
+}
+
+STATIC void
+xfs_save_resvblks(struct xfs_mount *mp)
+{
+	uint64_t resblks = 0;
+
+	mp->m_resblks_save = mp->m_resblks;
+	xfs_reserve_blocks(mp, &resblks, NULL);
+}
+
+STATIC void
+xfs_restore_resvblks(struct xfs_mount *mp)
+{
+	uint64_t resblks;
+
+	if (mp->m_resblks_save) {
+		resblks = mp->m_resblks_save;
+		mp->m_resblks_save = 0;
+	} else
+		resblks = xfs_default_resblks(mp);
+
+	xfs_reserve_blocks(mp, &resblks, NULL);
+}
+
+/*
+ * Second stage of a freeze. The data is already frozen so we only
+ * need to take care of the metadata. Once that's done sync the superblock
+ * to the log to dirty it in case of a crash while frozen. This ensures that we
+ * will recover the unlinked inode lists on the next mount.
+ */
+STATIC int
+xfs_fs_freeze(
+	struct super_block	*sb)
+{
+	struct xfs_mount	*mp = XFS_M(sb);
+	unsigned int		flags;
+	int			ret;
+
+	/*
+	 * The filesystem is now frozen far enough that memory reclaim
+	 * cannot safely operate on the filesystem. Hence we need to
+	 * set a GFP_NOFS context here to avoid recursion deadlocks.
+	 */
+	flags = memalloc_nofs_save();
+	xfs_save_resvblks(mp);
+	ret = xfs_log_quiesce(mp);
+	memalloc_nofs_restore(flags);
+
+	/*
+	 * For read-write filesystems, we need to restart the inodegc on error
+	 * because we stopped it at SB_FREEZE_PAGEFAULT level and a thaw is not
+	 * going to be run to restart it now.  We are at SB_FREEZE_FS level
+	 * here, so we can restart safely without racing with a stop in
+	 * xfs_fs_sync_fs().
+	 */
+	if (ret && !xfs_is_readonly(mp)) {
+		xfs_blockgc_start(mp);
+		xfs_inodegc_start(mp);
+	}
+
+	return ret;
+}
+
+STATIC int
+xfs_fs_unfreeze(
+	struct super_block	*sb)
+{
+	struct xfs_mount	*mp = XFS_M(sb);
+
+	xfs_restore_resvblks(mp);
+	xfs_log_work_queue(mp);
+
+	/*
+	 * Don't reactivate the inodegc worker on a readonly filesystem because
+	 * inodes are sent directly to reclaim.  Don't reactivate the blockgc
+	 * worker because there are no speculative preallocations on a readonly
+	 * filesystem.
+	 */
+	if (!xfs_is_readonly(mp)) {
+		xfs_blockgc_start(mp);
+		xfs_inodegc_start(mp);
+	}
+
+	return 0;
+}
+
+/*
+ * This function fills in xfs_mount_t fields based on mount args.
+ * Note: the superblock _has_ now been read in.
+ */
+STATIC int
+xfs_finish_flags(
+	struct xfs_mount	*mp)
+{
+	/* Fail a mount where the logbuf is smaller than the log stripe */
+	if (xfs_has_logv2(mp)) {
+		if (mp->m_logbsize <= 0 &&
+		    mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
+			mp->m_logbsize = mp->m_sb.sb_logsunit;
+		} else if (mp->m_logbsize > 0 &&
+			   mp->m_logbsize < mp->m_sb.sb_logsunit) {
+			xfs_warn(mp,
+		"logbuf size must be greater than or equal to log stripe size");
+			return -EINVAL;
+		}
+	} else {
+		/* Fail a mount if the logbuf is larger than 32K */
+		if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
+			xfs_warn(mp,
+		"logbuf size for version 1 logs must be 16K or 32K");
+			return -EINVAL;
+		}
+	}
+
+	/*
+	 * V5 filesystems always use attr2 format for attributes.
+	 */
+	if (xfs_has_crc(mp) && xfs_has_noattr2(mp)) {
+		xfs_warn(mp, "Cannot mount a V5 filesystem as noattr2. "
+			     "attr2 is always enabled for V5 filesystems.");
+		return -EINVAL;
+	}
+
+	/*
+	 * prohibit r/w mounts of read-only filesystems
+	 */
+	if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !xfs_is_readonly(mp)) {
+		xfs_warn(mp,
+			"cannot mount a read-only filesystem as read-write");
+		return -EROFS;
+	}
+
+	if ((mp->m_qflags & XFS_GQUOTA_ACCT) &&
+	    (mp->m_qflags & XFS_PQUOTA_ACCT) &&
+	    !xfs_has_pquotino(mp)) {
+		xfs_warn(mp,
+		  "Super block does not support project and group quota together");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int
+xfs_init_percpu_counters(
+	struct xfs_mount	*mp)
+{
+	int		error;
+
+	error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL);
+	if (error)
+		return -ENOMEM;
+
+	error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL);
+	if (error)
+		goto free_icount;
+
+	error = percpu_counter_init(&mp->m_fdblocks, 0, GFP_KERNEL);
+	if (error)
+		goto free_ifree;
+
+	error = percpu_counter_init(&mp->m_delalloc_blks, 0, GFP_KERNEL);
+	if (error)
+		goto free_fdblocks;
+
+	error = percpu_counter_init(&mp->m_frextents, 0, GFP_KERNEL);
+	if (error)
+		goto free_delalloc;
+
+	return 0;
+
+free_delalloc:
+	percpu_counter_destroy(&mp->m_delalloc_blks);
+free_fdblocks:
+	percpu_counter_destroy(&mp->m_fdblocks);
+free_ifree:
+	percpu_counter_destroy(&mp->m_ifree);
+free_icount:
+	percpu_counter_destroy(&mp->m_icount);
+	return -ENOMEM;
+}
+
+void
+xfs_reinit_percpu_counters(
+	struct xfs_mount	*mp)
+{
+	percpu_counter_set(&mp->m_icount, mp->m_sb.sb_icount);
+	percpu_counter_set(&mp->m_ifree, mp->m_sb.sb_ifree);
+	percpu_counter_set(&mp->m_fdblocks, mp->m_sb.sb_fdblocks);
+	percpu_counter_set(&mp->m_frextents, mp->m_sb.sb_frextents);
+}
+
+static void
+xfs_destroy_percpu_counters(
+	struct xfs_mount	*mp)
+{
+	percpu_counter_destroy(&mp->m_icount);
+	percpu_counter_destroy(&mp->m_ifree);
+	percpu_counter_destroy(&mp->m_fdblocks);
+	ASSERT(xfs_is_shutdown(mp) ||
+	       percpu_counter_sum(&mp->m_delalloc_blks) == 0);
+	percpu_counter_destroy(&mp->m_delalloc_blks);
+	percpu_counter_destroy(&mp->m_frextents);
+}
+
+static int
+xfs_inodegc_init_percpu(
+	struct xfs_mount	*mp)
+{
+	struct xfs_inodegc	*gc;
+	int			cpu;
+
+	mp->m_inodegc = alloc_percpu(struct xfs_inodegc);
+	if (!mp->m_inodegc)
+		return -ENOMEM;
+
+	for_each_possible_cpu(cpu) {
+		gc = per_cpu_ptr(mp->m_inodegc, cpu);
+		gc->cpu = cpu;
+		gc->mp = mp;
+		init_llist_head(&gc->list);
+		gc->items = 0;
+		gc->error = 0;
+		INIT_DELAYED_WORK(&gc->work, xfs_inodegc_worker);
+	}
+	return 0;
+}
+
+static void
+xfs_inodegc_free_percpu(
+	struct xfs_mount	*mp)
+{
+	if (!mp->m_inodegc)
+		return;
+	free_percpu(mp->m_inodegc);
+}
+
+static void
+xfs_fs_put_super(
+	struct super_block	*sb)
+{
+	struct xfs_mount	*mp = XFS_M(sb);
+
+	xfs_notice(mp, "Unmounting Filesystem %pU", &mp->m_sb.sb_uuid);
+	xfs_filestream_unmount(mp);
+	xfs_unmountfs(mp);
+
+	xfs_freesb(mp);
+	xchk_mount_stats_free(mp);
+	free_percpu(mp->m_stats.xs_stats);
+	xfs_inodegc_free_percpu(mp);
+	xfs_destroy_percpu_counters(mp);
+	xfs_destroy_mount_workqueues(mp);
+	xfs_shutdown_devices(mp);
+}
+
+static long
+xfs_fs_nr_cached_objects(
+	struct super_block	*sb,
+	struct shrink_control	*sc)
+{
+	/* Paranoia: catch incorrect calls during mount setup or teardown */
+	if (WARN_ON_ONCE(!sb->s_fs_info))
+		return 0;
+	return xfs_reclaim_inodes_count(XFS_M(sb));
+}
+
+static long
+xfs_fs_free_cached_objects(
+	struct super_block	*sb,
+	struct shrink_control	*sc)
+{
+	return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
+}
+
+static void
+xfs_fs_shutdown(
+	struct super_block	*sb)
+{
+	xfs_force_shutdown(XFS_M(sb), SHUTDOWN_DEVICE_REMOVED);
+}
+
+static const struct super_operations xfs_super_operations = {
+	.alloc_inode		= xfs_fs_alloc_inode,
+	.destroy_inode		= xfs_fs_destroy_inode,
+	.dirty_inode		= xfs_fs_dirty_inode,
+	.drop_inode		= xfs_fs_drop_inode,
+	.put_super		= xfs_fs_put_super,
+	.sync_fs		= xfs_fs_sync_fs,
+	.freeze_fs		= xfs_fs_freeze,
+	.unfreeze_fs		= xfs_fs_unfreeze,
+	.statfs			= xfs_fs_statfs,
+	.show_options		= xfs_fs_show_options,
+	.nr_cached_objects	= xfs_fs_nr_cached_objects,
+	.free_cached_objects	= xfs_fs_free_cached_objects,
+	.shutdown		= xfs_fs_shutdown,
+};
+
+static int
+suffix_kstrtoint(
+	const char	*s,
+	unsigned int	base,
+	int		*res)
+{
+	int		last, shift_left_factor = 0, _res;
+	char		*value;
+	int		ret = 0;
+
+	value = kstrdup(s, GFP_KERNEL);
+	if (!value)
+		return -ENOMEM;
+
+	last = strlen(value) - 1;
+	if (value[last] == 'K' || value[last] == 'k') {
+		shift_left_factor = 10;
+		value[last] = '\0';
+	}
+	if (value[last] == 'M' || value[last] == 'm') {
+		shift_left_factor = 20;
+		value[last] = '\0';
+	}
+	if (value[last] == 'G' || value[last] == 'g') {
+		shift_left_factor = 30;
+		value[last] = '\0';
+	}
+
+	if (kstrtoint(value, base, &_res))
+		ret = -EINVAL;
+	kfree(value);
+	*res = _res << shift_left_factor;
+	return ret;
+}
+
+static inline void
+xfs_fs_warn_deprecated(
+	struct fs_context	*fc,
+	struct fs_parameter	*param,
+	uint64_t		flag,
+	bool			value)
+{
+	/* Don't print the warning if reconfiguring and current mount point
+	 * already had the flag set
+	 */
+	if ((fc->purpose & FS_CONTEXT_FOR_RECONFIGURE) &&
+            !!(XFS_M(fc->root->d_sb)->m_features & flag) == value)
+		return;
+	xfs_warn(fc->s_fs_info, "%s mount option is deprecated.", param->key);
+}
+
+/*
+ * Set mount state from a mount option.
+ *
+ * NOTE: mp->m_super is NULL here!
+ */
+static int
+xfs_fs_parse_param(
+	struct fs_context	*fc,
+	struct fs_parameter	*param)
+{
+	struct xfs_mount	*parsing_mp = fc->s_fs_info;
+	struct fs_parse_result	result;
+	int			size = 0;
+	int			opt;
+
+	opt = fs_parse(fc, xfs_fs_parameters, param, &result);
+	if (opt < 0)
+		return opt;
+
+	switch (opt) {
+	case Opt_logbufs:
+		parsing_mp->m_logbufs = result.uint_32;
+		return 0;
+	case Opt_logbsize:
+		if (suffix_kstrtoint(param->string, 10, &parsing_mp->m_logbsize))
+			return -EINVAL;
+		return 0;
+	case Opt_logdev:
+		kfree(parsing_mp->m_logname);
+		parsing_mp->m_logname = kstrdup(param->string, GFP_KERNEL);
+		if (!parsing_mp->m_logname)
+			return -ENOMEM;
+		return 0;
+	case Opt_rtdev:
+		kfree(parsing_mp->m_rtname);
+		parsing_mp->m_rtname = kstrdup(param->string, GFP_KERNEL);
+		if (!parsing_mp->m_rtname)
+			return -ENOMEM;
+		return 0;
+	case Opt_allocsize:
+		if (suffix_kstrtoint(param->string, 10, &size))
+			return -EINVAL;
+		parsing_mp->m_allocsize_log = ffs(size) - 1;
+		parsing_mp->m_features |= XFS_FEAT_ALLOCSIZE;
+		return 0;
+	case Opt_grpid:
+	case Opt_bsdgroups:
+		parsing_mp->m_features |= XFS_FEAT_GRPID;
+		return 0;
+	case Opt_nogrpid:
+	case Opt_sysvgroups:
+		parsing_mp->m_features &= ~XFS_FEAT_GRPID;
+		return 0;
+	case Opt_wsync:
+		parsing_mp->m_features |= XFS_FEAT_WSYNC;
+		return 0;
+	case Opt_norecovery:
+		parsing_mp->m_features |= XFS_FEAT_NORECOVERY;
+		return 0;
+	case Opt_noalign:
+		parsing_mp->m_features |= XFS_FEAT_NOALIGN;
+		return 0;
+	case Opt_swalloc:
+		parsing_mp->m_features |= XFS_FEAT_SWALLOC;
+		return 0;
+	case Opt_sunit:
+		parsing_mp->m_dalign = result.uint_32;
+		return 0;
+	case Opt_swidth:
+		parsing_mp->m_swidth = result.uint_32;
+		return 0;
+	case Opt_inode32:
+		parsing_mp->m_features |= XFS_FEAT_SMALL_INUMS;
+		return 0;
+	case Opt_inode64:
+		parsing_mp->m_features &= ~XFS_FEAT_SMALL_INUMS;
+		return 0;
+	case Opt_nouuid:
+		parsing_mp->m_features |= XFS_FEAT_NOUUID;
+		return 0;
+	case Opt_largeio:
+		parsing_mp->m_features |= XFS_FEAT_LARGE_IOSIZE;
+		return 0;
+	case Opt_nolargeio:
+		parsing_mp->m_features &= ~XFS_FEAT_LARGE_IOSIZE;
+		return 0;
+	case Opt_filestreams:
+		parsing_mp->m_features |= XFS_FEAT_FILESTREAMS;
+		return 0;
+	case Opt_noquota:
+		parsing_mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
+		parsing_mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
+		return 0;
+	case Opt_quota:
+	case Opt_uquota:
+	case Opt_usrquota:
+		parsing_mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ENFD);
+		return 0;
+	case Opt_qnoenforce:
+	case Opt_uqnoenforce:
+		parsing_mp->m_qflags |= XFS_UQUOTA_ACCT;
+		parsing_mp->m_qflags &= ~XFS_UQUOTA_ENFD;
+		return 0;
+	case Opt_pquota:
+	case Opt_prjquota:
+		parsing_mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ENFD);
+		return 0;
+	case Opt_pqnoenforce:
+		parsing_mp->m_qflags |= XFS_PQUOTA_ACCT;
+		parsing_mp->m_qflags &= ~XFS_PQUOTA_ENFD;
+		return 0;
+	case Opt_gquota:
+	case Opt_grpquota:
+		parsing_mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ENFD);
+		return 0;
+	case Opt_gqnoenforce:
+		parsing_mp->m_qflags |= XFS_GQUOTA_ACCT;
+		parsing_mp->m_qflags &= ~XFS_GQUOTA_ENFD;
+		return 0;
+	case Opt_discard:
+		parsing_mp->m_features |= XFS_FEAT_DISCARD;
+		return 0;
+	case Opt_nodiscard:
+		parsing_mp->m_features &= ~XFS_FEAT_DISCARD;
+		return 0;
+#ifdef CONFIG_FS_DAX
+	case Opt_dax:
+		xfs_mount_set_dax_mode(parsing_mp, XFS_DAX_ALWAYS);
+		return 0;
+	case Opt_dax_enum:
+		xfs_mount_set_dax_mode(parsing_mp, result.uint_32);
+		return 0;
+#endif
+	/* Following mount options will be removed in September 2025 */
+	case Opt_ikeep:
+		xfs_fs_warn_deprecated(fc, param, XFS_FEAT_IKEEP, true);
+		parsing_mp->m_features |= XFS_FEAT_IKEEP;
+		return 0;
+	case Opt_noikeep:
+		xfs_fs_warn_deprecated(fc, param, XFS_FEAT_IKEEP, false);
+		parsing_mp->m_features &= ~XFS_FEAT_IKEEP;
+		return 0;
+	case Opt_attr2:
+		xfs_fs_warn_deprecated(fc, param, XFS_FEAT_ATTR2, true);
+		parsing_mp->m_features |= XFS_FEAT_ATTR2;
+		return 0;
+	case Opt_noattr2:
+		xfs_fs_warn_deprecated(fc, param, XFS_FEAT_NOATTR2, true);
+		parsing_mp->m_features |= XFS_FEAT_NOATTR2;
+		return 0;
+	default:
+		xfs_warn(parsing_mp, "unknown mount option [%s].", param->key);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int
+xfs_fs_validate_params(
+	struct xfs_mount	*mp)
+{
+	/* No recovery flag requires a read-only mount */
+	if (xfs_has_norecovery(mp) && !xfs_is_readonly(mp)) {
+		xfs_warn(mp, "no-recovery mounts must be read-only.");
+		return -EINVAL;
+	}
+
+	/*
+	 * We have not read the superblock at this point, so only the attr2
+	 * mount option can set the attr2 feature by this stage.
+	 */
+	if (xfs_has_attr2(mp) && xfs_has_noattr2(mp)) {
+		xfs_warn(mp, "attr2 and noattr2 cannot both be specified.");
+		return -EINVAL;
+	}
+
+
+	if (xfs_has_noalign(mp) && (mp->m_dalign || mp->m_swidth)) {
+		xfs_warn(mp,
+	"sunit and swidth options incompatible with the noalign option");
+		return -EINVAL;
+	}
+
+	if (!IS_ENABLED(CONFIG_XFS_QUOTA) && mp->m_qflags != 0) {
+		xfs_warn(mp, "quota support not available in this kernel.");
+		return -EINVAL;
+	}
+
+	if ((mp->m_dalign && !mp->m_swidth) ||
+	    (!mp->m_dalign && mp->m_swidth)) {
+		xfs_warn(mp, "sunit and swidth must be specified together");
+		return -EINVAL;
+	}
+
+	if (mp->m_dalign && (mp->m_swidth % mp->m_dalign != 0)) {
+		xfs_warn(mp,
+	"stripe width (%d) must be a multiple of the stripe unit (%d)",
+			mp->m_swidth, mp->m_dalign);
+		return -EINVAL;
+	}
+
+	if (mp->m_logbufs != -1 &&
+	    mp->m_logbufs != 0 &&
+	    (mp->m_logbufs < XLOG_MIN_ICLOGS ||
+	     mp->m_logbufs > XLOG_MAX_ICLOGS)) {
+		xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
+			mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
+		return -EINVAL;
+	}
+
+	if (mp->m_logbsize != -1 &&
+	    mp->m_logbsize !=  0 &&
+	    (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
+	     mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
+	     !is_power_of_2(mp->m_logbsize))) {
+		xfs_warn(mp,
+			"invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
+			mp->m_logbsize);
+		return -EINVAL;
+	}
+
+	if (xfs_has_allocsize(mp) &&
+	    (mp->m_allocsize_log > XFS_MAX_IO_LOG ||
+	     mp->m_allocsize_log < XFS_MIN_IO_LOG)) {
+		xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
+			mp->m_allocsize_log, XFS_MIN_IO_LOG, XFS_MAX_IO_LOG);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+struct dentry *
+xfs_debugfs_mkdir(
+	const char	*name,
+	struct dentry	*parent)
+{
+	struct dentry	*child;
+
+	/* Apparently we're expected to ignore error returns?? */
+	child = debugfs_create_dir(name, parent);
+	if (IS_ERR(child))
+		return NULL;
+
+	return child;
+}
+
+static int
+xfs_fs_fill_super(
+	struct super_block	*sb,
+	struct fs_context	*fc)
+{
+	struct xfs_mount	*mp = sb->s_fs_info;
+	struct inode		*root;
+	int			flags = 0, error;
+
+	mp->m_super = sb;
+
+	/*
+	 * Copy VFS mount flags from the context now that all parameter parsing
+	 * is guaranteed to have been completed by either the old mount API or
+	 * the newer fsopen/fsconfig API.
+	 */
+	if (fc->sb_flags & SB_RDONLY)
+		set_bit(XFS_OPSTATE_READONLY, &mp->m_opstate);
+	if (fc->sb_flags & SB_DIRSYNC)
+		mp->m_features |= XFS_FEAT_DIRSYNC;
+	if (fc->sb_flags & SB_SYNCHRONOUS)
+		mp->m_features |= XFS_FEAT_WSYNC;
+
+	error = xfs_fs_validate_params(mp);
+	if (error)
+		return error;
+
+	sb_min_blocksize(sb, BBSIZE);
+	sb->s_xattr = xfs_xattr_handlers;
+	sb->s_export_op = &xfs_export_operations;
+#ifdef CONFIG_XFS_QUOTA
+	sb->s_qcop = &xfs_quotactl_operations;
+	sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
+#endif
+	sb->s_op = &xfs_super_operations;
+
+	/*
+	 * Delay mount work if the debug hook is set. This is debug
+	 * instrumention to coordinate simulation of xfs mount failures with
+	 * VFS superblock operations
+	 */
+	if (xfs_globals.mount_delay) {
+		xfs_notice(mp, "Delaying mount for %d seconds.",
+			xfs_globals.mount_delay);
+		msleep(xfs_globals.mount_delay * 1000);
+	}
+
+	if (fc->sb_flags & SB_SILENT)
+		flags |= XFS_MFSI_QUIET;
+
+	error = xfs_open_devices(mp);
+	if (error)
+		return error;
+
+	if (xfs_debugfs) {
+		mp->m_debugfs = xfs_debugfs_mkdir(mp->m_super->s_id,
+						  xfs_debugfs);
+	} else {
+		mp->m_debugfs = NULL;
+	}
+
+	error = xfs_init_mount_workqueues(mp);
+	if (error)
+		goto out_shutdown_devices;
+
+	error = xfs_init_percpu_counters(mp);
+	if (error)
+		goto out_destroy_workqueues;
+
+	error = xfs_inodegc_init_percpu(mp);
+	if (error)
+		goto out_destroy_counters;
+
+	/* Allocate stats memory before we do operations that might use it */
+	mp->m_stats.xs_stats = alloc_percpu(struct xfsstats);
+	if (!mp->m_stats.xs_stats) {
+		error = -ENOMEM;
+		goto out_destroy_inodegc;
+	}
+
+	error = xchk_mount_stats_alloc(mp);
+	if (error)
+		goto out_free_stats;
+
+	error = xfs_readsb(mp, flags);
+	if (error)
+		goto out_free_scrub_stats;
+
+	error = xfs_finish_flags(mp);
+	if (error)
+		goto out_free_sb;
+
+	error = xfs_setup_devices(mp);
+	if (error)
+		goto out_free_sb;
+
+	/* V4 support is undergoing deprecation. */
+	if (!xfs_has_crc(mp)) {
+#ifdef CONFIG_XFS_SUPPORT_V4
+		xfs_warn_once(mp,
+	"Deprecated V4 format (crc=0) will not be supported after September 2030.");
+#else
+		xfs_warn(mp,
+	"Deprecated V4 format (crc=0) not supported by kernel.");
+		error = -EINVAL;
+		goto out_free_sb;
+#endif
+	}
+
+	/* ASCII case insensitivity is undergoing deprecation. */
+	if (xfs_has_asciici(mp)) {
+#ifdef CONFIG_XFS_SUPPORT_ASCII_CI
+		xfs_warn_once(mp,
+	"Deprecated ASCII case-insensitivity feature (ascii-ci=1) will not be supported after September 2030.");
+#else
+		xfs_warn(mp,
+	"Deprecated ASCII case-insensitivity feature (ascii-ci=1) not supported by kernel.");
+		error = -EINVAL;
+		goto out_free_sb;
+#endif
+	}
+
+	/* Filesystem claims it needs repair, so refuse the mount. */
+	if (xfs_has_needsrepair(mp)) {
+		xfs_warn(mp, "Filesystem needs repair.  Please run xfs_repair.");
+		error = -EFSCORRUPTED;
+		goto out_free_sb;
+	}
+
+	/*
+	 * Don't touch the filesystem if a user tool thinks it owns the primary
+	 * superblock.  mkfs doesn't clear the flag from secondary supers, so
+	 * we don't check them at all.
+	 */
+	if (mp->m_sb.sb_inprogress) {
+		xfs_warn(mp, "Offline file system operation in progress!");
+		error = -EFSCORRUPTED;
+		goto out_free_sb;
+	}
+
+	/*
+	 * Until this is fixed only page-sized or smaller data blocks work.
+	 */
+	if (mp->m_sb.sb_blocksize > PAGE_SIZE) {
+		xfs_warn(mp,
+		"File system with blocksize %d bytes. "
+		"Only pagesize (%ld) or less will currently work.",
+				mp->m_sb.sb_blocksize, PAGE_SIZE);
+		error = -ENOSYS;
+		goto out_free_sb;
+	}
+
+	/* Ensure this filesystem fits in the page cache limits */
+	if (xfs_sb_validate_fsb_count(&mp->m_sb, mp->m_sb.sb_dblocks) ||
+	    xfs_sb_validate_fsb_count(&mp->m_sb, mp->m_sb.sb_rblocks)) {
+		xfs_warn(mp,
+		"file system too large to be mounted on this system.");
+		error = -EFBIG;
+		goto out_free_sb;
+	}
+
+	/*
+	 * XFS block mappings use 54 bits to store the logical block offset.
+	 * This should suffice to handle the maximum file size that the VFS
+	 * supports (currently 2^63 bytes on 64-bit and ULONG_MAX << PAGE_SHIFT
+	 * bytes on 32-bit), but as XFS and VFS have gotten the s_maxbytes
+	 * calculation wrong on 32-bit kernels in the past, we'll add a WARN_ON
+	 * to check this assertion.
+	 *
+	 * Avoid integer overflow by comparing the maximum bmbt offset to the
+	 * maximum pagecache offset in units of fs blocks.
+	 */
+	if (!xfs_verify_fileoff(mp, XFS_B_TO_FSBT(mp, MAX_LFS_FILESIZE))) {
+		xfs_warn(mp,
+"MAX_LFS_FILESIZE block offset (%llu) exceeds extent map maximum (%llu)!",
+			 XFS_B_TO_FSBT(mp, MAX_LFS_FILESIZE),
+			 XFS_MAX_FILEOFF);
+		error = -EINVAL;
+		goto out_free_sb;
+	}
+
+	error = xfs_filestream_mount(mp);
+	if (error)
+		goto out_free_sb;
+
+	/*
+	 * we must configure the block size in the superblock before we run the
+	 * full mount process as the mount process can lookup and cache inodes.
+	 */
+	sb->s_magic = XFS_SUPER_MAGIC;
+	sb->s_blocksize = mp->m_sb.sb_blocksize;
+	sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
+	sb->s_maxbytes = MAX_LFS_FILESIZE;
+	sb->s_max_links = XFS_MAXLINK;
+	sb->s_time_gran = 1;
+	if (xfs_has_bigtime(mp)) {
+		sb->s_time_min = xfs_bigtime_to_unix(XFS_BIGTIME_TIME_MIN);
+		sb->s_time_max = xfs_bigtime_to_unix(XFS_BIGTIME_TIME_MAX);
+	} else {
+		sb->s_time_min = XFS_LEGACY_TIME_MIN;
+		sb->s_time_max = XFS_LEGACY_TIME_MAX;
+	}
+	trace_xfs_inode_timestamp_range(mp, sb->s_time_min, sb->s_time_max);
+	sb->s_iflags |= SB_I_CGROUPWB;
+
+	set_posix_acl_flag(sb);
+
+	/* version 5 superblocks support inode version counters. */
+	if (xfs_has_crc(mp))
+		sb->s_flags |= SB_I_VERSION;
+
+	if (xfs_has_dax_always(mp)) {
+		error = xfs_setup_dax_always(mp);
+		if (error)
+			goto out_filestream_unmount;
+	}
+
+	if (xfs_has_discard(mp) && !bdev_max_discard_sectors(sb->s_bdev)) {
+		xfs_warn(mp,
+	"mounting with \"discard\" option, but the device does not support discard");
+		mp->m_features &= ~XFS_FEAT_DISCARD;
+	}
+
+	if (xfs_has_reflink(mp)) {
+		if (mp->m_sb.sb_rblocks) {
+			xfs_alert(mp,
+	"reflink not compatible with realtime device!");
+			error = -EINVAL;
+			goto out_filestream_unmount;
+		}
+
+		if (xfs_globals.always_cow) {
+			xfs_info(mp, "using DEBUG-only always_cow mode.");
+			mp->m_always_cow = true;
+		}
+	}
+
+	if (xfs_has_rmapbt(mp) && mp->m_sb.sb_rblocks) {
+		xfs_alert(mp,
+	"reverse mapping btree not compatible with realtime device!");
+		error = -EINVAL;
+		goto out_filestream_unmount;
+	}
+
+	error = xfs_mountfs(mp);
+	if (error)
+		goto out_filestream_unmount;
+
+	root = igrab(VFS_I(mp->m_rootip));
+	if (!root) {
+		error = -ENOENT;
+		goto out_unmount;
+	}
+	sb->s_root = d_make_root(root);
+	if (!sb->s_root) {
+		error = -ENOMEM;
+		goto out_unmount;
+	}
+
+	return 0;
+
+ out_filestream_unmount:
+	xfs_filestream_unmount(mp);
+ out_free_sb:
+	xfs_freesb(mp);
+ out_free_scrub_stats:
+	xchk_mount_stats_free(mp);
+ out_free_stats:
+	free_percpu(mp->m_stats.xs_stats);
+ out_destroy_inodegc:
+	xfs_inodegc_free_percpu(mp);
+ out_destroy_counters:
+	xfs_destroy_percpu_counters(mp);
+ out_destroy_workqueues:
+	xfs_destroy_mount_workqueues(mp);
+ out_shutdown_devices:
+	xfs_shutdown_devices(mp);
+	return error;
+
+ out_unmount:
+	xfs_filestream_unmount(mp);
+	xfs_unmountfs(mp);
+	goto out_free_sb;
+}
+
+static int
+xfs_fs_get_tree(
+	struct fs_context	*fc)
+{
+	return get_tree_bdev(fc, xfs_fs_fill_super);
+}
+
+static int
+xfs_remount_rw(
+	struct xfs_mount	*mp)
+{
+	struct xfs_sb		*sbp = &mp->m_sb;
+	int error;
+
+	if (xfs_has_norecovery(mp)) {
+		xfs_warn(mp,
+			"ro->rw transition prohibited on norecovery mount");
+		return -EINVAL;
+	}
+
+	if (xfs_sb_is_v5(sbp) &&
+	    xfs_sb_has_ro_compat_feature(sbp, XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
+		xfs_warn(mp,
+	"ro->rw transition prohibited on unknown (0x%x) ro-compat filesystem",
+			(sbp->sb_features_ro_compat &
+				XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
+		return -EINVAL;
+	}
+
+	clear_bit(XFS_OPSTATE_READONLY, &mp->m_opstate);
+
+	/*
+	 * If this is the first remount to writeable state we might have some
+	 * superblock changes to update.
+	 */
+	if (mp->m_update_sb) {
+		error = xfs_sync_sb(mp, false);
+		if (error) {
+			xfs_warn(mp, "failed to write sb changes");
+			return error;
+		}
+		mp->m_update_sb = false;
+	}
+
+	/*
+	 * Fill out the reserve pool if it is empty. Use the stashed value if
+	 * it is non-zero, otherwise go with the default.
+	 */
+	xfs_restore_resvblks(mp);
+	xfs_log_work_queue(mp);
+	xfs_blockgc_start(mp);
+
+	/* Create the per-AG metadata reservation pool .*/
+	error = xfs_fs_reserve_ag_blocks(mp);
+	if (error && error != -ENOSPC)
+		return error;
+
+	/* Re-enable the background inode inactivation worker. */
+	xfs_inodegc_start(mp);
+
+	return 0;
+}
+
+static int
+xfs_remount_ro(
+	struct xfs_mount	*mp)
+{
+	struct xfs_icwalk	icw = {
+		.icw_flags	= XFS_ICWALK_FLAG_SYNC,
+	};
+	int			error;
+
+	/* Flush all the dirty data to disk. */
+	error = sync_filesystem(mp->m_super);
+	if (error)
+		return error;
+
+	/*
+	 * Cancel background eofb scanning so it cannot race with the final
+	 * log force+buftarg wait and deadlock the remount.
+	 */
+	xfs_blockgc_stop(mp);
+
+	/*
+	 * Clear out all remaining COW staging extents and speculative post-EOF
+	 * preallocations so that we don't leave inodes requiring inactivation
+	 * cleanups during reclaim on a read-only mount.  We must process every
+	 * cached inode, so this requires a synchronous cache scan.
+	 */
+	error = xfs_blockgc_free_space(mp, &icw);
+	if (error) {
+		xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
+		return error;
+	}
+
+	/*
+	 * Stop the inodegc background worker.  xfs_fs_reconfigure already
+	 * flushed all pending inodegc work when it sync'd the filesystem.
+	 * The VFS holds s_umount, so we know that inodes cannot enter
+	 * xfs_fs_destroy_inode during a remount operation.  In readonly mode
+	 * we send inodes straight to reclaim, so no inodes will be queued.
+	 */
+	xfs_inodegc_stop(mp);
+
+	/* Free the per-AG metadata reservation pool. */
+	error = xfs_fs_unreserve_ag_blocks(mp);
+	if (error) {
+		xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
+		return error;
+	}
+
+	/*
+	 * Before we sync the metadata, we need to free up the reserve block
+	 * pool so that the used block count in the superblock on disk is
+	 * correct at the end of the remount. Stash the current* reserve pool
+	 * size so that if we get remounted rw, we can return it to the same
+	 * size.
+	 */
+	xfs_save_resvblks(mp);
+
+	xfs_log_clean(mp);
+	set_bit(XFS_OPSTATE_READONLY, &mp->m_opstate);
+
+	return 0;
+}
+
+/*
+ * Logically we would return an error here to prevent users from believing
+ * they might have changed mount options using remount which can't be changed.
+ *
+ * But unfortunately mount(8) adds all options from mtab and fstab to the mount
+ * arguments in some cases so we can't blindly reject options, but have to
+ * check for each specified option if it actually differs from the currently
+ * set option and only reject it if that's the case.
+ *
+ * Until that is implemented we return success for every remount request, and
+ * silently ignore all options that we can't actually change.
+ */
+static int
+xfs_fs_reconfigure(
+	struct fs_context *fc)
+{
+	struct xfs_mount	*mp = XFS_M(fc->root->d_sb);
+	struct xfs_mount        *new_mp = fc->s_fs_info;
+	int			flags = fc->sb_flags;
+	int			error;
+
+	/* version 5 superblocks always support version counters. */
+	if (xfs_has_crc(mp))
+		fc->sb_flags |= SB_I_VERSION;
+
+	error = xfs_fs_validate_params(new_mp);
+	if (error)
+		return error;
+
+	/* inode32 -> inode64 */
+	if (xfs_has_small_inums(mp) && !xfs_has_small_inums(new_mp)) {
+		mp->m_features &= ~XFS_FEAT_SMALL_INUMS;
+		mp->m_maxagi = xfs_set_inode_alloc(mp, mp->m_sb.sb_agcount);
+	}
+
+	/* inode64 -> inode32 */
+	if (!xfs_has_small_inums(mp) && xfs_has_small_inums(new_mp)) {
+		mp->m_features |= XFS_FEAT_SMALL_INUMS;
+		mp->m_maxagi = xfs_set_inode_alloc(mp, mp->m_sb.sb_agcount);
+	}
+
+	/* ro -> rw */
+	if (xfs_is_readonly(mp) && !(flags & SB_RDONLY)) {
+		error = xfs_remount_rw(mp);
+		if (error)
+			return error;
+	}
+
+	/* rw -> ro */
+	if (!xfs_is_readonly(mp) && (flags & SB_RDONLY)) {
+		error = xfs_remount_ro(mp);
+		if (error)
+			return error;
+	}
+
+	return 0;
+}
+
+static void
+xfs_fs_free(
+	struct fs_context	*fc)
+{
+	struct xfs_mount	*mp = fc->s_fs_info;
+
+	/*
+	 * mp is stored in the fs_context when it is initialized.
+	 * mp is transferred to the superblock on a successful mount,
+	 * but if an error occurs before the transfer we have to free
+	 * it here.
+	 */
+	if (mp)
+		xfs_mount_free(mp);
+}
+
+static const struct fs_context_operations xfs_context_ops = {
+	.parse_param = xfs_fs_parse_param,
+	.get_tree    = xfs_fs_get_tree,
+	.reconfigure = xfs_fs_reconfigure,
+	.free        = xfs_fs_free,
+};
+
+/*
+ * WARNING: do not initialise any parameters in this function that depend on
+ * mount option parsing having already been performed as this can be called from
+ * fsopen() before any parameters have been set.
+ */
+static int xfs_init_fs_context(
+	struct fs_context	*fc)
+{
+	struct xfs_mount	*mp;
+
+	mp = kmem_alloc(sizeof(struct xfs_mount), KM_ZERO);
+	if (!mp)
+		return -ENOMEM;
+
+	spin_lock_init(&mp->m_sb_lock);
+	INIT_RADIX_TREE(&mp->m_perag_tree, GFP_ATOMIC);
+	spin_lock_init(&mp->m_perag_lock);
+	mutex_init(&mp->m_growlock);
+	INIT_WORK(&mp->m_flush_inodes_work, xfs_flush_inodes_worker);
+	INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
+	mp->m_kobj.kobject.kset = xfs_kset;
+	/*
+	 * We don't create the finobt per-ag space reservation until after log
+	 * recovery, so we must set this to true so that an ifree transaction
+	 * started during log recovery will not depend on space reservations
+	 * for finobt expansion.
+	 */
+	mp->m_finobt_nores = true;
+
+	/*
+	 * These can be overridden by the mount option parsing.
+	 */
+	mp->m_logbufs = -1;
+	mp->m_logbsize = -1;
+	mp->m_allocsize_log = 16; /* 64k */
+
+	fc->s_fs_info = mp;
+	fc->ops = &xfs_context_ops;
+
+	return 0;
+}
+
+static void
+xfs_kill_sb(
+	struct super_block		*sb)
+{
+	kill_block_super(sb);
+	xfs_mount_free(XFS_M(sb));
+}
+
+static struct file_system_type xfs_fs_type = {
+	.owner			= THIS_MODULE,
+	.name			= "xfs",
+	.init_fs_context	= xfs_init_fs_context,
+	.parameters		= xfs_fs_parameters,
+	.kill_sb		= xfs_kill_sb,
+	.fs_flags		= FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
+};
+MODULE_ALIAS_FS("xfs");
+
+STATIC int __init
+xfs_init_caches(void)
+{
+	int		error;
+
+	xfs_buf_cache = kmem_cache_create("xfs_buf", sizeof(struct xfs_buf), 0,
+					 SLAB_HWCACHE_ALIGN |
+					 SLAB_RECLAIM_ACCOUNT |
+					 SLAB_MEM_SPREAD,
+					 NULL);
+	if (!xfs_buf_cache)
+		goto out;
+
+	xfs_log_ticket_cache = kmem_cache_create("xfs_log_ticket",
+						sizeof(struct xlog_ticket),
+						0, 0, NULL);
+	if (!xfs_log_ticket_cache)
+		goto out_destroy_buf_cache;
+
+	error = xfs_btree_init_cur_caches();
+	if (error)
+		goto out_destroy_log_ticket_cache;
+
+	error = xfs_defer_init_item_caches();
+	if (error)
+		goto out_destroy_btree_cur_cache;
+
+	xfs_da_state_cache = kmem_cache_create("xfs_da_state",
+					      sizeof(struct xfs_da_state),
+					      0, 0, NULL);
+	if (!xfs_da_state_cache)
+		goto out_destroy_defer_item_cache;
+
+	xfs_ifork_cache = kmem_cache_create("xfs_ifork",
+					   sizeof(struct xfs_ifork),
+					   0, 0, NULL);
+	if (!xfs_ifork_cache)
+		goto out_destroy_da_state_cache;
+
+	xfs_trans_cache = kmem_cache_create("xfs_trans",
+					   sizeof(struct xfs_trans),
+					   0, 0, NULL);
+	if (!xfs_trans_cache)
+		goto out_destroy_ifork_cache;
+
+
+	/*
+	 * The size of the cache-allocated buf log item is the maximum
+	 * size possible under XFS.  This wastes a little bit of memory,
+	 * but it is much faster.
+	 */
+	xfs_buf_item_cache = kmem_cache_create("xfs_buf_item",
+					      sizeof(struct xfs_buf_log_item),
+					      0, 0, NULL);
+	if (!xfs_buf_item_cache)
+		goto out_destroy_trans_cache;
+
+	xfs_efd_cache = kmem_cache_create("xfs_efd_item",
+			xfs_efd_log_item_sizeof(XFS_EFD_MAX_FAST_EXTENTS),
+			0, 0, NULL);
+	if (!xfs_efd_cache)
+		goto out_destroy_buf_item_cache;
+
+	xfs_efi_cache = kmem_cache_create("xfs_efi_item",
+			xfs_efi_log_item_sizeof(XFS_EFI_MAX_FAST_EXTENTS),
+			0, 0, NULL);
+	if (!xfs_efi_cache)
+		goto out_destroy_efd_cache;
+
+	xfs_inode_cache = kmem_cache_create("xfs_inode",
+					   sizeof(struct xfs_inode), 0,
+					   (SLAB_HWCACHE_ALIGN |
+					    SLAB_RECLAIM_ACCOUNT |
+					    SLAB_MEM_SPREAD | SLAB_ACCOUNT),
+					   xfs_fs_inode_init_once);
+	if (!xfs_inode_cache)
+		goto out_destroy_efi_cache;
+
+	xfs_ili_cache = kmem_cache_create("xfs_ili",
+					 sizeof(struct xfs_inode_log_item), 0,
+					 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD,
+					 NULL);
+	if (!xfs_ili_cache)
+		goto out_destroy_inode_cache;
+
+	xfs_icreate_cache = kmem_cache_create("xfs_icr",
+					     sizeof(struct xfs_icreate_item),
+					     0, 0, NULL);
+	if (!xfs_icreate_cache)
+		goto out_destroy_ili_cache;
+
+	xfs_rud_cache = kmem_cache_create("xfs_rud_item",
+					 sizeof(struct xfs_rud_log_item),
+					 0, 0, NULL);
+	if (!xfs_rud_cache)
+		goto out_destroy_icreate_cache;
+
+	xfs_rui_cache = kmem_cache_create("xfs_rui_item",
+			xfs_rui_log_item_sizeof(XFS_RUI_MAX_FAST_EXTENTS),
+			0, 0, NULL);
+	if (!xfs_rui_cache)
+		goto out_destroy_rud_cache;
+
+	xfs_cud_cache = kmem_cache_create("xfs_cud_item",
+					 sizeof(struct xfs_cud_log_item),
+					 0, 0, NULL);
+	if (!xfs_cud_cache)
+		goto out_destroy_rui_cache;
+
+	xfs_cui_cache = kmem_cache_create("xfs_cui_item",
+			xfs_cui_log_item_sizeof(XFS_CUI_MAX_FAST_EXTENTS),
+			0, 0, NULL);
+	if (!xfs_cui_cache)
+		goto out_destroy_cud_cache;
+
+	xfs_bud_cache = kmem_cache_create("xfs_bud_item",
+					 sizeof(struct xfs_bud_log_item),
+					 0, 0, NULL);
+	if (!xfs_bud_cache)
+		goto out_destroy_cui_cache;
+
+	xfs_bui_cache = kmem_cache_create("xfs_bui_item",
+			xfs_bui_log_item_sizeof(XFS_BUI_MAX_FAST_EXTENTS),
+			0, 0, NULL);
+	if (!xfs_bui_cache)
+		goto out_destroy_bud_cache;
+
+	xfs_attrd_cache = kmem_cache_create("xfs_attrd_item",
+					    sizeof(struct xfs_attrd_log_item),
+					    0, 0, NULL);
+	if (!xfs_attrd_cache)
+		goto out_destroy_bui_cache;
+
+	xfs_attri_cache = kmem_cache_create("xfs_attri_item",
+					    sizeof(struct xfs_attri_log_item),
+					    0, 0, NULL);
+	if (!xfs_attri_cache)
+		goto out_destroy_attrd_cache;
+
+	xfs_iunlink_cache = kmem_cache_create("xfs_iul_item",
+					     sizeof(struct xfs_iunlink_item),
+					     0, 0, NULL);
+	if (!xfs_iunlink_cache)
+		goto out_destroy_attri_cache;
+
+	return 0;
+
+ out_destroy_attri_cache:
+	kmem_cache_destroy(xfs_attri_cache);
+ out_destroy_attrd_cache:
+	kmem_cache_destroy(xfs_attrd_cache);
+ out_destroy_bui_cache:
+	kmem_cache_destroy(xfs_bui_cache);
+ out_destroy_bud_cache:
+	kmem_cache_destroy(xfs_bud_cache);
+ out_destroy_cui_cache:
+	kmem_cache_destroy(xfs_cui_cache);
+ out_destroy_cud_cache:
+	kmem_cache_destroy(xfs_cud_cache);
+ out_destroy_rui_cache:
+	kmem_cache_destroy(xfs_rui_cache);
+ out_destroy_rud_cache:
+	kmem_cache_destroy(xfs_rud_cache);
+ out_destroy_icreate_cache:
+	kmem_cache_destroy(xfs_icreate_cache);
+ out_destroy_ili_cache:
+	kmem_cache_destroy(xfs_ili_cache);
+ out_destroy_inode_cache:
+	kmem_cache_destroy(xfs_inode_cache);
+ out_destroy_efi_cache:
+	kmem_cache_destroy(xfs_efi_cache);
+ out_destroy_efd_cache:
+	kmem_cache_destroy(xfs_efd_cache);
+ out_destroy_buf_item_cache:
+	kmem_cache_destroy(xfs_buf_item_cache);
+ out_destroy_trans_cache:
+	kmem_cache_destroy(xfs_trans_cache);
+ out_destroy_ifork_cache:
+	kmem_cache_destroy(xfs_ifork_cache);
+ out_destroy_da_state_cache:
+	kmem_cache_destroy(xfs_da_state_cache);
+ out_destroy_defer_item_cache:
+	xfs_defer_destroy_item_caches();
+ out_destroy_btree_cur_cache:
+	xfs_btree_destroy_cur_caches();
+ out_destroy_log_ticket_cache:
+	kmem_cache_destroy(xfs_log_ticket_cache);
+ out_destroy_buf_cache:
+	kmem_cache_destroy(xfs_buf_cache);
+ out:
+	return -ENOMEM;
+}
+
+STATIC void
+xfs_destroy_caches(void)
+{
+	/*
+	 * Make sure all delayed rcu free are flushed before we
+	 * destroy caches.
+	 */
+	rcu_barrier();
+	kmem_cache_destroy(xfs_iunlink_cache);
+	kmem_cache_destroy(xfs_attri_cache);
+	kmem_cache_destroy(xfs_attrd_cache);
+	kmem_cache_destroy(xfs_bui_cache);
+	kmem_cache_destroy(xfs_bud_cache);
+	kmem_cache_destroy(xfs_cui_cache);
+	kmem_cache_destroy(xfs_cud_cache);
+	kmem_cache_destroy(xfs_rui_cache);
+	kmem_cache_destroy(xfs_rud_cache);
+	kmem_cache_destroy(xfs_icreate_cache);
+	kmem_cache_destroy(xfs_ili_cache);
+	kmem_cache_destroy(xfs_inode_cache);
+	kmem_cache_destroy(xfs_efi_cache);
+	kmem_cache_destroy(xfs_efd_cache);
+	kmem_cache_destroy(xfs_buf_item_cache);
+	kmem_cache_destroy(xfs_trans_cache);
+	kmem_cache_destroy(xfs_ifork_cache);
+	kmem_cache_destroy(xfs_da_state_cache);
+	xfs_defer_destroy_item_caches();
+	xfs_btree_destroy_cur_caches();
+	kmem_cache_destroy(xfs_log_ticket_cache);
+	kmem_cache_destroy(xfs_buf_cache);
+}
+
+STATIC int __init
+xfs_init_workqueues(void)
+{
+	/*
+	 * The allocation workqueue can be used in memory reclaim situations
+	 * (writepage path), and parallelism is only limited by the number of
+	 * AGs in all the filesystems mounted. Hence use the default large
+	 * max_active value for this workqueue.
+	 */
+	xfs_alloc_wq = alloc_workqueue("xfsalloc",
+			XFS_WQFLAGS(WQ_MEM_RECLAIM | WQ_FREEZABLE), 0);
+	if (!xfs_alloc_wq)
+		return -ENOMEM;
+
+	xfs_discard_wq = alloc_workqueue("xfsdiscard", XFS_WQFLAGS(WQ_UNBOUND),
+			0);
+	if (!xfs_discard_wq)
+		goto out_free_alloc_wq;
+
+	return 0;
+out_free_alloc_wq:
+	destroy_workqueue(xfs_alloc_wq);
+	return -ENOMEM;
+}
+
+STATIC void
+xfs_destroy_workqueues(void)
+{
+	destroy_workqueue(xfs_discard_wq);
+	destroy_workqueue(xfs_alloc_wq);
+}
+
+STATIC int __init
+init_xfs_fs(void)
+{
+	int			error;
+
+	xfs_check_ondisk_structs();
+
+	error = xfs_dahash_test();
+	if (error)
+		return error;
+
+	printk(KERN_INFO XFS_VERSION_STRING " with "
+			 XFS_BUILD_OPTIONS " enabled\n");
+
+	xfs_dir_startup();
+
+	error = xfs_init_caches();
+	if (error)
+		goto out;
+
+	error = xfs_init_workqueues();
+	if (error)
+		goto out_destroy_caches;
+
+	error = xfs_mru_cache_init();
+	if (error)
+		goto out_destroy_wq;
+
+	error = xfs_init_procfs();
+	if (error)
+		goto out_mru_cache_uninit;
+
+	error = xfs_sysctl_register();
+	if (error)
+		goto out_cleanup_procfs;
+
+	xfs_debugfs = xfs_debugfs_mkdir("xfs", NULL);
+
+	xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
+	if (!xfs_kset) {
+		error = -ENOMEM;
+		goto out_debugfs_unregister;
+	}
+
+	xfsstats.xs_kobj.kobject.kset = xfs_kset;
+
+	xfsstats.xs_stats = alloc_percpu(struct xfsstats);
+	if (!xfsstats.xs_stats) {
+		error = -ENOMEM;
+		goto out_kset_unregister;
+	}
+
+	error = xfs_sysfs_init(&xfsstats.xs_kobj, &xfs_stats_ktype, NULL,
+			       "stats");
+	if (error)
+		goto out_free_stats;
+
+	error = xchk_global_stats_setup(xfs_debugfs);
+	if (error)
+		goto out_remove_stats_kobj;
+
+#ifdef DEBUG
+	xfs_dbg_kobj.kobject.kset = xfs_kset;
+	error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug");
+	if (error)
+		goto out_remove_scrub_stats;
+#endif
+
+	error = xfs_qm_init();
+	if (error)
+		goto out_remove_dbg_kobj;
+
+	error = register_filesystem(&xfs_fs_type);
+	if (error)
+		goto out_qm_exit;
+	return 0;
+
+ out_qm_exit:
+	xfs_qm_exit();
+ out_remove_dbg_kobj:
+#ifdef DEBUG
+	xfs_sysfs_del(&xfs_dbg_kobj);
+ out_remove_scrub_stats:
+#endif
+	xchk_global_stats_teardown();
+ out_remove_stats_kobj:
+	xfs_sysfs_del(&xfsstats.xs_kobj);
+ out_free_stats:
+	free_percpu(xfsstats.xs_stats);
+ out_kset_unregister:
+	kset_unregister(xfs_kset);
+ out_debugfs_unregister:
+	debugfs_remove(xfs_debugfs);
+	xfs_sysctl_unregister();
+ out_cleanup_procfs:
+	xfs_cleanup_procfs();
+ out_mru_cache_uninit:
+	xfs_mru_cache_uninit();
+ out_destroy_wq:
+	xfs_destroy_workqueues();
+ out_destroy_caches:
+	xfs_destroy_caches();
+ out:
+	return error;
+}
+
+STATIC void __exit
+exit_xfs_fs(void)
+{
+	xfs_qm_exit();
+	unregister_filesystem(&xfs_fs_type);
+#ifdef DEBUG
+	xfs_sysfs_del(&xfs_dbg_kobj);
+#endif
+	xchk_global_stats_teardown();
+	xfs_sysfs_del(&xfsstats.xs_kobj);
+	free_percpu(xfsstats.xs_stats);
+	kset_unregister(xfs_kset);
+	debugfs_remove(xfs_debugfs);
+	xfs_sysctl_unregister();
+	xfs_cleanup_procfs();
+	xfs_mru_cache_uninit();
+	xfs_destroy_workqueues();
+	xfs_destroy_caches();
+	xfs_uuid_table_free();
+}
+
+module_init(init_xfs_fs);
+module_exit(exit_xfs_fs);
+
+MODULE_AUTHOR("Silicon Graphics, Inc.");
+MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
+MODULE_LICENSE("GPL");