xfs: remove subdirectories

Use the move from Linux 2.6 to Linux 3.x as an excuse to kill the
annoying subdirectories in the XFS source code.  Besides the large
amount of file rename the only changes are to the Makefile, a few
files including headers with the subdirectory prefix, and the binary
sysctl compat code that includes a header under fs/xfs/ from
kernel/.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>

1 files changed, 1773 insertions, 0 deletions

diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
new file mode 100644
index 000000000000..9a72dda58bd0
--- /dev/null
+++ b/fs/xfs/xfs_super.c
@@ -0,0 +1,1773 @@
+/*
+ * Copyright (c) 2000-2006 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include "xfs.h"
+#include "xfs_bit.h"
+#include "xfs_log.h"
+#include "xfs_inum.h"
+#include "xfs_trans.h"
+#include "xfs_sb.h"
+#include "xfs_ag.h"
+#include "xfs_dir2.h"
+#include "xfs_alloc.h"
+#include "xfs_quota.h"
+#include "xfs_mount.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_alloc_btree.h"
+#include "xfs_ialloc_btree.h"
+#include "xfs_dinode.h"
+#include "xfs_inode.h"
+#include "xfs_btree.h"
+#include "xfs_ialloc.h"
+#include "xfs_bmap.h"
+#include "xfs_rtalloc.h"
+#include "xfs_error.h"
+#include "xfs_itable.h"
+#include "xfs_fsops.h"
+#include "xfs_attr.h"
+#include "xfs_buf_item.h"
+#include "xfs_utils.h"
+#include "xfs_vnodeops.h"
+#include "xfs_log_priv.h"
+#include "xfs_trans_priv.h"
+#include "xfs_filestream.h"
+#include "xfs_da_btree.h"
+#include "xfs_extfree_item.h"
+#include "xfs_mru_cache.h"
+#include "xfs_inode_item.h"
+#include "xfs_sync.h"
+#include "xfs_trace.h"
+
+#include <linux/namei.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/mount.h>
+#include <linux/mempool.h>
+#include <linux/writeback.h>
+#include <linux/kthread.h>
+#include <linux/freezer.h>
+#include <linux/parser.h>
+
+static const struct super_operations xfs_super_operations;
+static kmem_zone_t *xfs_ioend_zone;
+mempool_t *xfs_ioend_pool;
+
+#define MNTOPT_LOGBUFS	"logbufs"	/* number of XFS log buffers */
+#define MNTOPT_LOGBSIZE	"logbsize"	/* size of XFS log buffers */
+#define MNTOPT_LOGDEV	"logdev"	/* log device */
+#define MNTOPT_RTDEV	"rtdev"		/* realtime I/O device */
+#define MNTOPT_BIOSIZE	"biosize"	/* log2 of preferred buffered io size */
+#define MNTOPT_WSYNC	"wsync"		/* safe-mode nfs compatible mount */
+#define MNTOPT_NOALIGN	"noalign"	/* turn off stripe alignment */
+#define MNTOPT_SWALLOC	"swalloc"	/* turn on stripe width allocation */
+#define MNTOPT_SUNIT	"sunit"		/* data volume stripe unit */
+#define MNTOPT_SWIDTH	"swidth"	/* data volume stripe width */
+#define MNTOPT_NOUUID	"nouuid"	/* ignore filesystem UUID */
+#define MNTOPT_MTPT	"mtpt"		/* filesystem mount point */
+#define MNTOPT_GRPID	"grpid"		/* group-ID from parent directory */
+#define MNTOPT_NOGRPID	"nogrpid"	/* group-ID from current process */
+#define MNTOPT_BSDGROUPS    "bsdgroups"    /* group-ID from parent directory */
+#define MNTOPT_SYSVGROUPS   "sysvgroups"   /* group-ID from current process */
+#define MNTOPT_ALLOCSIZE    "allocsize"    /* preferred allocation size */
+#define MNTOPT_NORECOVERY   "norecovery"   /* don't run XFS recovery */
+#define MNTOPT_BARRIER	"barrier"	/* use writer barriers for log write and
+					 * unwritten extent conversion */
+#define MNTOPT_NOBARRIER "nobarrier"	/* .. disable */
+#define MNTOPT_64BITINODE   "inode64"	/* inodes can be allocated anywhere */
+#define MNTOPT_IKEEP	"ikeep"		/* do not free empty inode clusters */
+#define MNTOPT_NOIKEEP	"noikeep"	/* free empty inode clusters */
+#define MNTOPT_LARGEIO	   "largeio"	/* report large I/O sizes in stat() */
+#define MNTOPT_NOLARGEIO   "nolargeio"	/* do not report large I/O sizes
+					 * in stat(). */
+#define MNTOPT_ATTR2	"attr2"		/* do use attr2 attribute format */
+#define MNTOPT_NOATTR2	"noattr2"	/* do not use attr2 attribute format */
+#define MNTOPT_FILESTREAM  "filestreams" /* use filestreams allocator */
+#define MNTOPT_QUOTA	"quota"		/* disk quotas (user) */
+#define MNTOPT_NOQUOTA	"noquota"	/* no quotas */
+#define MNTOPT_USRQUOTA	"usrquota"	/* user quota enabled */
+#define MNTOPT_GRPQUOTA	"grpquota"	/* group quota enabled */
+#define MNTOPT_PRJQUOTA	"prjquota"	/* project quota enabled */
+#define MNTOPT_UQUOTA	"uquota"	/* user quota (IRIX variant) */
+#define MNTOPT_GQUOTA	"gquota"	/* group quota (IRIX variant) */
+#define MNTOPT_PQUOTA	"pquota"	/* project quota (IRIX variant) */
+#define MNTOPT_UQUOTANOENF "uqnoenforce"/* user quota limit enforcement */
+#define MNTOPT_GQUOTANOENF "gqnoenforce"/* group quota limit enforcement */
+#define MNTOPT_PQUOTANOENF "pqnoenforce"/* project quota limit enforcement */
+#define MNTOPT_QUOTANOENF  "qnoenforce"	/* same as uqnoenforce */
+#define MNTOPT_DELAYLOG    "delaylog"	/* Delayed logging enabled */
+#define MNTOPT_NODELAYLOG  "nodelaylog"	/* Delayed logging disabled */
+#define MNTOPT_DISCARD	   "discard"	/* Discard unused blocks */
+#define MNTOPT_NODISCARD   "nodiscard"	/* Do not discard unused blocks */
+
+/*
+ * Table driven mount option parser.
+ *
+ * Currently only used for remount, but it will be used for mount
+ * in the future, too.
+ */
+enum {
+	Opt_barrier, Opt_nobarrier, Opt_err
+};
+
+static const match_table_t tokens = {
+	{Opt_barrier, "barrier"},
+	{Opt_nobarrier, "nobarrier"},
+	{Opt_err, NULL}
+};
+
+
+STATIC unsigned long
+suffix_strtoul(char *s, char **endp, unsigned int base)
+{
+	int	last, shift_left_factor = 0;
+	char	*value = s;
+
+	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';
+	}
+
+	return simple_strtoul((const char *)s, endp, base) << shift_left_factor;
+}
+
+/*
+ * This function fills in xfs_mount_t fields based on mount args.
+ * Note: the superblock has _not_ yet been read in.
+ *
+ * Note that this function leaks the various device name allocations on
+ * failure.  The caller takes care of them.
+ */
+STATIC int
+xfs_parseargs(
+	struct xfs_mount	*mp,
+	char			*options)
+{
+	struct super_block	*sb = mp->m_super;
+	char			*this_char, *value, *eov;
+	int			dsunit = 0;
+	int			dswidth = 0;
+	int			iosize = 0;
+	__uint8_t		iosizelog = 0;
+
+	/*
+	 * set up the mount name first so all the errors will refer to the
+	 * correct device.
+	 */
+	mp->m_fsname = kstrndup(sb->s_id, MAXNAMELEN, GFP_KERNEL);
+	if (!mp->m_fsname)
+		return ENOMEM;
+	mp->m_fsname_len = strlen(mp->m_fsname) + 1;
+
+	/*
+	 * Copy binary VFS mount flags we are interested in.
+	 */
+	if (sb->s_flags & MS_RDONLY)
+		mp->m_flags |= XFS_MOUNT_RDONLY;
+	if (sb->s_flags & MS_DIRSYNC)
+		mp->m_flags |= XFS_MOUNT_DIRSYNC;
+	if (sb->s_flags & MS_SYNCHRONOUS)
+		mp->m_flags |= XFS_MOUNT_WSYNC;
+
+	/*
+	 * Set some default flags that could be cleared by the mount option
+	 * parsing.
+	 */
+	mp->m_flags |= XFS_MOUNT_BARRIER;
+	mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
+	mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
+	mp->m_flags |= XFS_MOUNT_DELAYLOG;
+
+	/*
+	 * These can be overridden by the mount option parsing.
+	 */
+	mp->m_logbufs = -1;
+	mp->m_logbsize = -1;
+
+	if (!options)
+		goto done;
+
+	while ((this_char = strsep(&options, ",")) != NULL) {
+		if (!*this_char)
+			continue;
+		if ((value = strchr(this_char, '=')) != NULL)
+			*value++ = 0;
+
+		if (!strcmp(this_char, MNTOPT_LOGBUFS)) {
+			if (!value || !*value) {
+				xfs_warn(mp, "%s option requires an argument",
+					this_char);
+				return EINVAL;
+			}
+			mp->m_logbufs = simple_strtoul(value, &eov, 10);
+		} else if (!strcmp(this_char, MNTOPT_LOGBSIZE)) {
+			if (!value || !*value) {
+				xfs_warn(mp, "%s option requires an argument",
+					this_char);
+				return EINVAL;
+			}
+			mp->m_logbsize = suffix_strtoul(value, &eov, 10);
+		} else if (!strcmp(this_char, MNTOPT_LOGDEV)) {
+			if (!value || !*value) {
+				xfs_warn(mp, "%s option requires an argument",
+					this_char);
+				return EINVAL;
+			}
+			mp->m_logname = kstrndup(value, MAXNAMELEN, GFP_KERNEL);
+			if (!mp->m_logname)
+				return ENOMEM;
+		} else if (!strcmp(this_char, MNTOPT_MTPT)) {
+			xfs_warn(mp, "%s option not allowed on this system",
+				this_char);
+			return EINVAL;
+		} else if (!strcmp(this_char, MNTOPT_RTDEV)) {
+			if (!value || !*value) {
+				xfs_warn(mp, "%s option requires an argument",
+					this_char);
+				return EINVAL;
+			}
+			mp->m_rtname = kstrndup(value, MAXNAMELEN, GFP_KERNEL);
+			if (!mp->m_rtname)
+				return ENOMEM;
+		} else if (!strcmp(this_char, MNTOPT_BIOSIZE)) {
+			if (!value || !*value) {
+				xfs_warn(mp, "%s option requires an argument",
+					this_char);
+				return EINVAL;
+			}
+			iosize = simple_strtoul(value, &eov, 10);
+			iosizelog = ffs(iosize) - 1;
+		} else if (!strcmp(this_char, MNTOPT_ALLOCSIZE)) {
+			if (!value || !*value) {
+				xfs_warn(mp, "%s option requires an argument",
+					this_char);
+				return EINVAL;
+			}
+			iosize = suffix_strtoul(value, &eov, 10);
+			iosizelog = ffs(iosize) - 1;
+		} else if (!strcmp(this_char, MNTOPT_GRPID) ||
+			   !strcmp(this_char, MNTOPT_BSDGROUPS)) {
+			mp->m_flags |= XFS_MOUNT_GRPID;
+		} else if (!strcmp(this_char, MNTOPT_NOGRPID) ||
+			   !strcmp(this_char, MNTOPT_SYSVGROUPS)) {
+			mp->m_flags &= ~XFS_MOUNT_GRPID;
+		} else if (!strcmp(this_char, MNTOPT_WSYNC)) {
+			mp->m_flags |= XFS_MOUNT_WSYNC;
+		} else if (!strcmp(this_char, MNTOPT_NORECOVERY)) {
+			mp->m_flags |= XFS_MOUNT_NORECOVERY;
+		} else if (!strcmp(this_char, MNTOPT_NOALIGN)) {
+			mp->m_flags |= XFS_MOUNT_NOALIGN;
+		} else if (!strcmp(this_char, MNTOPT_SWALLOC)) {
+			mp->m_flags |= XFS_MOUNT_SWALLOC;
+		} else if (!strcmp(this_char, MNTOPT_SUNIT)) {
+			if (!value || !*value) {
+				xfs_warn(mp, "%s option requires an argument",
+					this_char);
+				return EINVAL;
+			}
+			dsunit = simple_strtoul(value, &eov, 10);
+		} else if (!strcmp(this_char, MNTOPT_SWIDTH)) {
+			if (!value || !*value) {
+				xfs_warn(mp, "%s option requires an argument",
+					this_char);
+				return EINVAL;
+			}
+			dswidth = simple_strtoul(value, &eov, 10);
+		} else if (!strcmp(this_char, MNTOPT_64BITINODE)) {
+			mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
+#if !XFS_BIG_INUMS
+			xfs_warn(mp, "%s option not allowed on this system",
+				this_char);
+			return EINVAL;
+#endif
+		} else if (!strcmp(this_char, MNTOPT_NOUUID)) {
+			mp->m_flags |= XFS_MOUNT_NOUUID;
+		} else if (!strcmp(this_char, MNTOPT_BARRIER)) {
+			mp->m_flags |= XFS_MOUNT_BARRIER;
+		} else if (!strcmp(this_char, MNTOPT_NOBARRIER)) {
+			mp->m_flags &= ~XFS_MOUNT_BARRIER;
+		} else if (!strcmp(this_char, MNTOPT_IKEEP)) {
+			mp->m_flags |= XFS_MOUNT_IKEEP;
+		} else if (!strcmp(this_char, MNTOPT_NOIKEEP)) {
+			mp->m_flags &= ~XFS_MOUNT_IKEEP;
+		} else if (!strcmp(this_char, MNTOPT_LARGEIO)) {
+			mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE;
+		} else if (!strcmp(this_char, MNTOPT_NOLARGEIO)) {
+			mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
+		} else if (!strcmp(this_char, MNTOPT_ATTR2)) {
+			mp->m_flags |= XFS_MOUNT_ATTR2;
+		} else if (!strcmp(this_char, MNTOPT_NOATTR2)) {
+			mp->m_flags &= ~XFS_MOUNT_ATTR2;
+			mp->m_flags |= XFS_MOUNT_NOATTR2;
+		} else if (!strcmp(this_char, MNTOPT_FILESTREAM)) {
+			mp->m_flags |= XFS_MOUNT_FILESTREAMS;
+		} else if (!strcmp(this_char, MNTOPT_NOQUOTA)) {
+			mp->m_qflags &= ~(XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
+					  XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
+					  XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
+					  XFS_UQUOTA_ENFD | XFS_OQUOTA_ENFD);
+		} else if (!strcmp(this_char, MNTOPT_QUOTA) ||
+			   !strcmp(this_char, MNTOPT_UQUOTA) ||
+			   !strcmp(this_char, MNTOPT_USRQUOTA)) {
+			mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
+					 XFS_UQUOTA_ENFD);
+		} else if (!strcmp(this_char, MNTOPT_QUOTANOENF) ||
+			   !strcmp(this_char, MNTOPT_UQUOTANOENF)) {
+			mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
+			mp->m_qflags &= ~XFS_UQUOTA_ENFD;
+		} else if (!strcmp(this_char, MNTOPT_PQUOTA) ||
+			   !strcmp(this_char, MNTOPT_PRJQUOTA)) {
+			mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
+					 XFS_OQUOTA_ENFD);
+		} else if (!strcmp(this_char, MNTOPT_PQUOTANOENF)) {
+			mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
+			mp->m_qflags &= ~XFS_OQUOTA_ENFD;
+		} else if (!strcmp(this_char, MNTOPT_GQUOTA) ||
+			   !strcmp(this_char, MNTOPT_GRPQUOTA)) {
+			mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
+					 XFS_OQUOTA_ENFD);
+		} else if (!strcmp(this_char, MNTOPT_GQUOTANOENF)) {
+			mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
+			mp->m_qflags &= ~XFS_OQUOTA_ENFD;
+		} else if (!strcmp(this_char, MNTOPT_DELAYLOG)) {
+			mp->m_flags |= XFS_MOUNT_DELAYLOG;
+		} else if (!strcmp(this_char, MNTOPT_NODELAYLOG)) {
+			mp->m_flags &= ~XFS_MOUNT_DELAYLOG;
+		} else if (!strcmp(this_char, MNTOPT_DISCARD)) {
+			mp->m_flags |= XFS_MOUNT_DISCARD;
+		} else if (!strcmp(this_char, MNTOPT_NODISCARD)) {
+			mp->m_flags &= ~XFS_MOUNT_DISCARD;
+		} else if (!strcmp(this_char, "ihashsize")) {
+			xfs_warn(mp,
+	"ihashsize no longer used, option is deprecated.");
+		} else if (!strcmp(this_char, "osyncisdsync")) {
+			xfs_warn(mp,
+	"osyncisdsync has no effect, option is deprecated.");
+		} else if (!strcmp(this_char, "osyncisosync")) {
+			xfs_warn(mp,
+	"osyncisosync has no effect, option is deprecated.");
+		} else if (!strcmp(this_char, "irixsgid")) {
+			xfs_warn(mp,
+	"irixsgid is now a sysctl(2) variable, option is deprecated.");
+		} else {
+			xfs_warn(mp, "unknown mount option [%s].", this_char);
+			return EINVAL;
+		}
+	}
+
+	/*
+	 * no recovery flag requires a read-only mount
+	 */
+	if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
+	    !(mp->m_flags & XFS_MOUNT_RDONLY)) {
+		xfs_warn(mp, "no-recovery mounts must be read-only.");
+		return EINVAL;
+	}
+
+	if ((mp->m_flags & XFS_MOUNT_NOALIGN) && (dsunit || dswidth)) {
+		xfs_warn(mp,
+	"sunit and swidth options incompatible with the noalign option");
+		return EINVAL;
+	}
+
+	if ((mp->m_flags & XFS_MOUNT_DISCARD) &&
+	    !(mp->m_flags & XFS_MOUNT_DELAYLOG)) {
+		xfs_warn(mp,
+	"the discard option is incompatible with the nodelaylog option");
+		return EINVAL;
+	}
+
+#ifndef CONFIG_XFS_QUOTA
+	if (XFS_IS_QUOTA_RUNNING(mp)) {
+		xfs_warn(mp, "quota support not available in this kernel.");
+		return EINVAL;
+	}
+#endif
+
+	if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
+	    (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE))) {
+		xfs_warn(mp, "cannot mount with both project and group quota");
+		return EINVAL;
+	}
+
+	if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
+		xfs_warn(mp, "sunit and swidth must be specified together");
+		return EINVAL;
+	}
+
+	if (dsunit && (dswidth % dsunit != 0)) {
+		xfs_warn(mp,
+	"stripe width (%d) must be a multiple of the stripe unit (%d)",
+			dswidth, dsunit);
+		return EINVAL;
+	}
+
+done:
+	if (!(mp->m_flags & XFS_MOUNT_NOALIGN)) {
+		/*
+		 * At this point the superblock has not been read
+		 * in, therefore we do not know the block size.
+		 * Before the mount call ends we will convert
+		 * these to FSBs.
+		 */
+		if (dsunit) {
+			mp->m_dalign = dsunit;
+			mp->m_flags |= XFS_MOUNT_RETERR;
+		}
+
+		if (dswidth)
+			mp->m_swidth = dswidth;
+	}
+
+	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 XFS_ERROR(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 XFS_ERROR(EINVAL);
+	}
+
+	if (iosizelog) {
+		if (iosizelog > XFS_MAX_IO_LOG ||
+		    iosizelog < XFS_MIN_IO_LOG) {
+			xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
+				iosizelog, XFS_MIN_IO_LOG,
+				XFS_MAX_IO_LOG);
+			return XFS_ERROR(EINVAL);
+		}
+
+		mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
+		mp->m_readio_log = iosizelog;
+		mp->m_writeio_log = iosizelog;
+	}
+
+	return 0;
+}
+
+struct proc_xfs_info {
+	int	flag;
+	char	*str;
+};
+
+STATIC int
+xfs_showargs(
+	struct xfs_mount	*mp,
+	struct seq_file		*m)
+{
+	static struct proc_xfs_info xfs_info_set[] = {
+		/* the few simple ones we can get from the mount struct */
+		{ XFS_MOUNT_IKEEP,		"," MNTOPT_IKEEP },
+		{ XFS_MOUNT_WSYNC,		"," MNTOPT_WSYNC },
+		{ XFS_MOUNT_NOALIGN,		"," MNTOPT_NOALIGN },
+		{ XFS_MOUNT_SWALLOC,		"," MNTOPT_SWALLOC },
+		{ XFS_MOUNT_NOUUID,		"," MNTOPT_NOUUID },
+		{ XFS_MOUNT_NORECOVERY,		"," MNTOPT_NORECOVERY },
+		{ XFS_MOUNT_ATTR2,		"," MNTOPT_ATTR2 },
+		{ XFS_MOUNT_FILESTREAMS,	"," MNTOPT_FILESTREAM },
+		{ XFS_MOUNT_GRPID,		"," MNTOPT_GRPID },
+		{ XFS_MOUNT_DELAYLOG,		"," MNTOPT_DELAYLOG },
+		{ XFS_MOUNT_DISCARD,		"," MNTOPT_DISCARD },
+		{ 0, NULL }
+	};
+	static struct proc_xfs_info xfs_info_unset[] = {
+		/* the few simple ones we can get from the mount struct */
+		{ XFS_MOUNT_COMPAT_IOSIZE,	"," MNTOPT_LARGEIO },
+		{ XFS_MOUNT_BARRIER,		"," MNTOPT_NOBARRIER },
+		{ XFS_MOUNT_SMALL_INUMS,	"," MNTOPT_64BITINODE },
+		{ 0, NULL }
+	};
+	struct proc_xfs_info	*xfs_infop;
+
+	for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
+		if (mp->m_flags & xfs_infop->flag)
+			seq_puts(m, xfs_infop->str);
+	}
+	for (xfs_infop = xfs_info_unset; xfs_infop->flag; xfs_infop++) {
+		if (!(mp->m_flags & xfs_infop->flag))
+			seq_puts(m, xfs_infop->str);
+	}
+
+	if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
+		seq_printf(m, "," MNTOPT_ALLOCSIZE "=%dk",
+				(int)(1 << mp->m_writeio_log) >> 10);
+
+	if (mp->m_logbufs > 0)
+		seq_printf(m, "," MNTOPT_LOGBUFS "=%d", mp->m_logbufs);
+	if (mp->m_logbsize > 0)
+		seq_printf(m, "," MNTOPT_LOGBSIZE "=%dk", mp->m_logbsize >> 10);
+
+	if (mp->m_logname)
+		seq_printf(m, "," MNTOPT_LOGDEV "=%s", mp->m_logname);
+	if (mp->m_rtname)
+		seq_printf(m, "," MNTOPT_RTDEV "=%s", mp->m_rtname);
+
+	if (mp->m_dalign > 0)
+		seq_printf(m, "," MNTOPT_SUNIT "=%d",
+				(int)XFS_FSB_TO_BB(mp, mp->m_dalign));
+	if (mp->m_swidth > 0)
+		seq_printf(m, "," MNTOPT_SWIDTH "=%d",
+				(int)XFS_FSB_TO_BB(mp, mp->m_swidth));
+
+	if (mp->m_qflags & (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD))
+		seq_puts(m, "," MNTOPT_USRQUOTA);
+	else if (mp->m_qflags & XFS_UQUOTA_ACCT)
+		seq_puts(m, "," MNTOPT_UQUOTANOENF);
+
+	/* Either project or group quotas can be active, not both */
+
+	if (mp->m_qflags & XFS_PQUOTA_ACCT) {
+		if (mp->m_qflags & XFS_OQUOTA_ENFD)
+			seq_puts(m, "," MNTOPT_PRJQUOTA);
+		else
+			seq_puts(m, "," MNTOPT_PQUOTANOENF);
+	} else if (mp->m_qflags & XFS_GQUOTA_ACCT) {
+		if (mp->m_qflags & XFS_OQUOTA_ENFD)
+			seq_puts(m, "," MNTOPT_GRPQUOTA);
+		else
+			seq_puts(m, "," MNTOPT_GQUOTANOENF);
+	}
+
+	if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
+		seq_puts(m, "," MNTOPT_NOQUOTA);
+
+	return 0;
+}
+__uint64_t
+xfs_max_file_offset(
+	unsigned int		blockshift)
+{
+	unsigned int		pagefactor = 1;
+	unsigned int		bitshift = BITS_PER_LONG - 1;
+
+	/* Figure out maximum filesize, on Linux this can depend on
+	 * the filesystem blocksize (on 32 bit platforms).
+	 * __block_write_begin does this in an [unsigned] long...
+	 *      page->index << (PAGE_CACHE_SHIFT - bbits)
+	 * So, for page sized blocks (4K on 32 bit platforms),
+	 * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
+	 *      (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
+	 * but for smaller blocksizes it is less (bbits = log2 bsize).
+	 * Note1: get_block_t takes a long (implicit cast from above)
+	 * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch
+	 * can optionally convert the [unsigned] long from above into
+	 * an [unsigned] long long.
+	 */
+
+#if BITS_PER_LONG == 32
+# if defined(CONFIG_LBDAF)
+	ASSERT(sizeof(sector_t) == 8);
+	pagefactor = PAGE_CACHE_SIZE;
+	bitshift = BITS_PER_LONG;
+# else
+	pagefactor = PAGE_CACHE_SIZE >> (PAGE_CACHE_SHIFT - blockshift);
+# endif
+#endif
+
+	return (((__uint64_t)pagefactor) << bitshift) - 1;
+}
+
+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, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
+				    mp);
+	if (IS_ERR(*bdevp)) {
+		error = PTR_ERR(*bdevp);
+		xfs_warn(mp, "Invalid device [%s], error=%d\n", name, error);
+	}
+
+	return -error;
+}
+
+STATIC void
+xfs_blkdev_put(
+	struct block_device	*bdev)
+{
+	if (bdev)
+		blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
+}
+
+void
+xfs_blkdev_issue_flush(
+	xfs_buftarg_t		*buftarg)
+{
+	blkdev_issue_flush(buftarg->bt_bdev, GFP_KERNEL, NULL);
+}
+
+STATIC void
+xfs_close_devices(
+	struct xfs_mount	*mp)
+{
+	if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
+		struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
+		xfs_free_buftarg(mp, mp->m_logdev_targp);
+		xfs_blkdev_put(logdev);
+	}
+	if (mp->m_rtdev_targp) {
+		struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
+		xfs_free_buftarg(mp, mp->m_rtdev_targp);
+		xfs_blkdev_put(rtdev);
+	}
+	xfs_free_buftarg(mp, mp->m_ddev_targp);
+}
+
+/*
+ * 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 block_device	*ddev = mp->m_super->s_bdev;
+	struct block_device	*logdev = NULL, *rtdev = NULL;
+	int			error;
+
+	/*
+	 * 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;
+	}
+
+	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, 0, mp->m_fsname);
+	if (!mp->m_ddev_targp)
+		goto out_close_rtdev;
+
+	if (rtdev) {
+		mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev, 1,
+							mp->m_fsname);
+		if (!mp->m_rtdev_targp)
+			goto out_free_ddev_targ;
+	}
+
+	if (logdev && logdev != ddev) {
+		mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev, 1,
+							mp->m_fsname);
+		if (!mp->m_logdev_targp)
+			goto out_free_rtdev_targ;
+	} else {
+		mp->m_logdev_targp = mp->m_ddev_targp;
+	}
+
+	return 0;
+
+ out_free_rtdev_targ:
+	if (mp->m_rtdev_targp)
+		xfs_free_buftarg(mp, mp->m_rtdev_targp);
+ out_free_ddev_targ:
+	xfs_free_buftarg(mp, mp->m_ddev_targp);
+ out_close_rtdev:
+	if (rtdev)
+		xfs_blkdev_put(rtdev);
+ out_close_logdev:
+	if (logdev && logdev != ddev)
+		xfs_blkdev_put(logdev);
+ out:
+	return error;
+}
+
+/*
+ * 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_blocksize,
+				    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_sb_version_hassector(&mp->m_sb))
+			log_sector_size = mp->m_sb.sb_logsectsize;
+		error = xfs_setsize_buftarg(mp->m_logdev_targp,
+					    mp->m_sb.sb_blocksize,
+					    log_sector_size);
+		if (error)
+			return error;
+	}
+	if (mp->m_rtdev_targp) {
+		error = xfs_setsize_buftarg(mp->m_rtdev_targp,
+					    mp->m_sb.sb_blocksize,
+					    mp->m_sb.sb_sectsize);
+		if (error)
+			return error;
+	}
+
+	return 0;
+}
+
+/* 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 reclaim the inode.
+ */
+STATIC void
+xfs_fs_destroy_inode(
+	struct inode		*inode)
+{
+	struct xfs_inode	*ip = XFS_I(inode);
+
+	trace_xfs_destroy_inode(ip);
+
+	XFS_STATS_INC(vn_reclaim);
+
+	/* bad inode, get out here ASAP */
+	if (is_bad_inode(inode))
+		goto out_reclaim;
+
+	xfs_ioend_wait(ip);
+
+	ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0);
+
+	/*
+	 * We should never get here with one of the reclaim flags already set.
+	 */
+	ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
+	ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
+
+	/*
+	 * We always use background reclaim here because even if the
+	 * inode is clean, it still may be under IO and hence we have
+	 * to take the flush lock. The background reclaim path handles
+	 * this more efficiently than we can here, so simply let background
+	 * reclaim tear down all inodes.
+	 */
+out_reclaim:
+	xfs_inode_set_reclaim_tag(ip);
+}
+
+/*
+ * 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_iocount, 0);
+	atomic_set(&ip->i_pincount, 0);
+	spin_lock_init(&ip->i_flags_lock);
+	init_waitqueue_head(&ip->i_ipin_wait);
+	/*
+	 * Because we want to use a counting completion, complete
+	 * the flush completion once to allow a single access to
+	 * the flush completion without blocking.
+	 */
+	init_completion(&ip->i_flush);
+	complete(&ip->i_flush);
+
+	mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
+		     "xfsino", ip->i_ino);
+}
+
+/*
+ * Dirty the XFS inode when mark_inode_dirty_sync() is called so that
+ * we catch unlogged VFS level updates to the inode.
+ *
+ * We need the barrier() to maintain correct ordering between unlogged
+ * updates and the transaction commit code that clears the i_update_core
+ * field. This requires all updates to be completed before marking the
+ * inode dirty.
+ */
+STATIC void
+xfs_fs_dirty_inode(
+	struct inode	*inode,
+	int		flags)
+{
+	barrier();
+	XFS_I(inode)->i_update_core = 1;
+}
+
+STATIC int
+xfs_log_inode(
+	struct xfs_inode	*ip)
+{
+	struct xfs_mount	*mp = ip->i_mount;
+	struct xfs_trans	*tp;
+	int			error;
+
+	xfs_iunlock(ip, XFS_ILOCK_SHARED);
+	tp = xfs_trans_alloc(mp, XFS_TRANS_FSYNC_TS);
+	error = xfs_trans_reserve(tp, 0, XFS_FSYNC_TS_LOG_RES(mp), 0, 0, 0);
+
+	if (error) {
+		xfs_trans_cancel(tp, 0);
+		/* we need to return with the lock hold shared */
+		xfs_ilock(ip, XFS_ILOCK_SHARED);
+		return error;
+	}
+
+	xfs_ilock(ip, XFS_ILOCK_EXCL);
+
+	/*
+	 * Note - it's possible that we might have pushed ourselves out of the
+	 * way during trans_reserve which would flush the inode.  But there's
+	 * no guarantee that the inode buffer has actually gone out yet (it's
+	 * delwri).  Plus the buffer could be pinned anyway if it's part of
+	 * an inode in another recent transaction.  So we play it safe and
+	 * fire off the transaction anyway.
+	 */
+	xfs_trans_ijoin(tp, ip);
+	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+	error = xfs_trans_commit(tp, 0);
+	xfs_ilock_demote(ip, XFS_ILOCK_EXCL);
+
+	return error;
+}
+
+STATIC int
+xfs_fs_write_inode(
+	struct inode		*inode,
+	struct writeback_control *wbc)
+{
+	struct xfs_inode	*ip = XFS_I(inode);
+	struct xfs_mount	*mp = ip->i_mount;
+	int			error = EAGAIN;
+
+	trace_xfs_write_inode(ip);
+
+	if (XFS_FORCED_SHUTDOWN(mp))
+		return XFS_ERROR(EIO);
+
+	if (wbc->sync_mode == WB_SYNC_ALL) {
+		/*
+		 * Make sure the inode has made it it into the log.  Instead
+		 * of forcing it all the way to stable storage using a
+		 * synchronous transaction we let the log force inside the
+		 * ->sync_fs call do that for thus, which reduces the number
+		 * of synchronous log foces dramatically.
+		 */
+		xfs_ioend_wait(ip);
+		xfs_ilock(ip, XFS_ILOCK_SHARED);
+		if (ip->i_update_core) {
+			error = xfs_log_inode(ip);
+			if (error)
+				goto out_unlock;
+		}
+	} else {
+		/*
+		 * We make this non-blocking if the inode is contended, return
+		 * EAGAIN to indicate to the caller that they did not succeed.
+		 * This prevents the flush path from blocking on inodes inside
+		 * another operation right now, they get caught later by
+		 * xfs_sync.
+		 */
+		if (!xfs_ilock_nowait(ip, XFS_ILOCK_SHARED))
+			goto out;
+
+		if (xfs_ipincount(ip) || !xfs_iflock_nowait(ip))
+			goto out_unlock;
+
+		/*
+		 * Now we have the flush lock and the inode is not pinned, we
+		 * can check if the inode is really clean as we know that
+		 * there are no pending transaction completions, it is not
+		 * waiting on the delayed write queue and there is no IO in
+		 * progress.
+		 */
+		if (xfs_inode_clean(ip)) {
+			xfs_ifunlock(ip);
+			error = 0;
+			goto out_unlock;
+		}
+		error = xfs_iflush(ip, SYNC_TRYLOCK);
+	}
+
+ out_unlock:
+	xfs_iunlock(ip, XFS_ILOCK_SHARED);
+ out:
+	/*
+	 * if we failed to write out the inode then mark
+	 * it dirty again so we'll try again later.
+	 */
+	if (error)
+		xfs_mark_inode_dirty_sync(ip);
+	return -error;
+}
+
+STATIC void
+xfs_fs_evict_inode(
+	struct inode		*inode)
+{
+	xfs_inode_t		*ip = XFS_I(inode);
+
+	trace_xfs_evict_inode(ip);
+
+	truncate_inode_pages(&inode->i_data, 0);
+	end_writeback(inode);
+	XFS_STATS_INC(vn_rele);
+	XFS_STATS_INC(vn_remove);
+	XFS_STATS_DEC(vn_active);
+
+	/*
+	 * The iolock is used by the file system to coordinate reads,
+	 * writes, and block truncates.  Up to this point the lock
+	 * protected concurrent accesses by users of the inode.  But
+	 * from here forward we're doing some final processing of the
+	 * inode because we're done with it, and although we reuse the
+	 * iolock for protection it is really a distinct lock class
+	 * (in the lockdep sense) from before.  To keep lockdep happy
+	 * (and basically indicate what we are doing), we explicitly
+	 * re-init the iolock here.
+	 */
+	ASSERT(!rwsem_is_locked(&ip->i_iolock.mr_lock));
+	mrlock_init(&ip->i_iolock, MRLOCK_BARRIER, "xfsio", ip->i_ino);
+	lockdep_set_class_and_name(&ip->i_iolock.mr_lock,
+			&xfs_iolock_reclaimable, "xfs_iolock_reclaimable");
+
+	xfs_inactive(ip);
+}
+
+STATIC void
+xfs_free_fsname(
+	struct xfs_mount	*mp)
+{
+	kfree(mp->m_fsname);
+	kfree(mp->m_rtname);
+	kfree(mp->m_logname);
+}
+
+STATIC void
+xfs_fs_put_super(
+	struct super_block	*sb)
+{
+	struct xfs_mount	*mp = XFS_M(sb);
+
+	xfs_syncd_stop(mp);
+
+	/*
+	 * Blow away any referenced inode in the filestreams cache.
+	 * This can and will cause log traffic as inodes go inactive
+	 * here.
+	 */
+	xfs_filestream_unmount(mp);
+
+	XFS_bflush(mp->m_ddev_targp);
+
+	xfs_unmountfs(mp);
+	xfs_freesb(mp);
+	xfs_icsb_destroy_counters(mp);
+	xfs_close_devices(mp);
+	xfs_free_fsname(mp);
+	kfree(mp);
+}
+
+STATIC int
+xfs_fs_sync_fs(
+	struct super_block	*sb,
+	int			wait)
+{
+	struct xfs_mount	*mp = XFS_M(sb);
+	int			error;
+
+	/*
+	 * Not much we can do for the first async pass.  Writing out the
+	 * superblock would be counter-productive as we are going to redirty
+	 * when writing out other data and metadata (and writing out a single
+	 * block is quite fast anyway).
+	 *
+	 * Try to asynchronously kick off quota syncing at least.
+	 */
+	if (!wait) {
+		xfs_qm_sync(mp, SYNC_TRYLOCK);
+		return 0;
+	}
+
+	error = xfs_quiesce_data(mp);
+	if (error)
+		return -error;
+
+	if (laptop_mode) {
+		/*
+		 * The disk must be active because we're syncing.
+		 * We schedule xfssyncd now (now that the disk is
+		 * active) instead of later (when it might not be).
+		 */
+		flush_delayed_work_sync(&mp->m_sync_work);
+	}
+
+	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(dentry->d_inode);
+	__uint64_t		fakeinos, id;
+	xfs_extlen_t		lsize;
+	__int64_t		ffree;
+
+	statp->f_type = XFS_SB_MAGIC;
+	statp->f_namelen = MAXNAMELEN - 1;
+
+	id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
+	statp->f_fsid.val[0] = (u32)id;
+	statp->f_fsid.val[1] = (u32)(id >> 32);
+
+	xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
+
+	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;
+	statp->f_bfree = statp->f_bavail =
+				sbp->sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
+	fakeinos = statp->f_bfree << sbp->sb_inopblog;
+	statp->f_files =
+	    MIN(sbp->sb_icount + fakeinos, (__uint64_t)XFS_MAXINUMBER);
+	if (mp->m_maxicount)
+		statp->f_files = min_t(typeof(statp->f_files),
+					statp->f_files,
+					mp->m_maxicount);
+
+	/* make sure statp->f_ffree does not underflow */
+	ffree = statp->f_files - (sbp->sb_icount - sbp->sb_ifree);
+	statp->f_ffree = max_t(__int64_t, ffree, 0);
+
+	spin_unlock(&mp->m_sb_lock);
+
+	if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) ||
+	    ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_OQUOTA_ENFD))) ==
+			      (XFS_PQUOTA_ACCT|XFS_OQUOTA_ENFD))
+		xfs_qm_statvfs(ip, statp);
+	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);
+}
+
+STATIC int
+xfs_fs_remount(
+	struct super_block	*sb,
+	int			*flags,
+	char			*options)
+{
+	struct xfs_mount	*mp = XFS_M(sb);
+	substring_t		args[MAX_OPT_ARGS];
+	char			*p;
+	int			error;
+
+	while ((p = strsep(&options, ",")) != NULL) {
+		int token;
+
+		if (!*p)
+			continue;
+
+		token = match_token(p, tokens, args);
+		switch (token) {
+		case Opt_barrier:
+			mp->m_flags |= XFS_MOUNT_BARRIER;
+			break;
+		case Opt_nobarrier:
+			mp->m_flags &= ~XFS_MOUNT_BARRIER;
+			break;
+		default:
+			/*
+			 * 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.
+			 */
+#if 0
+			xfs_info(mp,
+		"mount option \"%s\" not supported for remount\n", p);
+			return -EINVAL;
+#else
+			break;
+#endif
+		}
+	}
+
+	/* ro -> rw */
+	if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & MS_RDONLY)) {
+		mp->m_flags &= ~XFS_MOUNT_RDONLY;
+
+		/*
+		 * If this is the first remount to writeable state we
+		 * might have some superblock changes to update.
+		 */
+		if (mp->m_update_flags) {
+			error = xfs_mount_log_sb(mp, mp->m_update_flags);
+			if (error) {
+				xfs_warn(mp, "failed to write sb changes");
+				return error;
+			}
+			mp->m_update_flags = 0;
+		}
+
+		/*
+		 * 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);
+	}
+
+	/* rw -> ro */
+	if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & MS_RDONLY)) {
+		/*
+		 * After we have synced the data but 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_quiesce_data(mp);
+		xfs_save_resvblks(mp);
+		xfs_quiesce_attr(mp);
+		mp->m_flags |= XFS_MOUNT_RDONLY;
+	}
+
+	return 0;
+}
+
+/*
+ * Second stage of a freeze. The data is already frozen so we only
+ * need to take care of the metadata. Once that's done write a dummy
+ * record to dirty the log in case of a crash while frozen.
+ */
+STATIC int
+xfs_fs_freeze(
+	struct super_block	*sb)
+{
+	struct xfs_mount	*mp = XFS_M(sb);
+
+	xfs_save_resvblks(mp);
+	xfs_quiesce_attr(mp);
+	return -xfs_fs_log_dummy(mp);
+}
+
+STATIC int
+xfs_fs_unfreeze(
+	struct super_block	*sb)
+{
+	struct xfs_mount	*mp = XFS_M(sb);
+
+	xfs_restore_resvblks(mp);
+	return 0;
+}
+
+STATIC int
+xfs_fs_show_options(
+	struct seq_file		*m,
+	struct vfsmount		*mnt)
+{
+	return -xfs_showargs(XFS_M(mnt->mnt_sb), m);
+}
+
+/*
+ * 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)
+{
+	int			ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
+
+	/* Fail a mount where the logbuf is smaller than the log stripe */
+	if (xfs_sb_version_haslogv2(&mp->m_sb)) {
+		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 XFS_ERROR(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 XFS_ERROR(EINVAL);
+		}
+	}
+
+	/*
+	 * mkfs'ed attr2 will turn on attr2 mount unless explicitly
+	 * told by noattr2 to turn it off
+	 */
+	if (xfs_sb_version_hasattr2(&mp->m_sb) &&
+	    !(mp->m_flags & XFS_MOUNT_NOATTR2))
+		mp->m_flags |= XFS_MOUNT_ATTR2;
+
+	/*
+	 * prohibit r/w mounts of read-only filesystems
+	 */
+	if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
+		xfs_warn(mp,
+			"cannot mount a read-only filesystem as read-write");
+		return XFS_ERROR(EROFS);
+	}
+
+	return 0;
+}
+
+STATIC int
+xfs_fs_fill_super(
+	struct super_block	*sb,
+	void			*data,
+	int			silent)
+{
+	struct inode		*root;
+	struct xfs_mount	*mp = NULL;
+	int			flags = 0, error = ENOMEM;
+
+	mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL);
+	if (!mp)
+		goto out;
+
+	spin_lock_init(&mp->m_sb_lock);
+	mutex_init(&mp->m_growlock);
+	atomic_set(&mp->m_active_trans, 0);
+
+	mp->m_super = sb;
+	sb->s_fs_info = mp;
+
+	error = xfs_parseargs(mp, (char *)data);
+	if (error)
+		goto out_free_fsname;
+
+	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;
+#endif
+	sb->s_op = &xfs_super_operations;
+
+	if (silent)
+		flags |= XFS_MFSI_QUIET;
+
+	error = xfs_open_devices(mp);
+	if (error)
+		goto out_free_fsname;
+
+	error = xfs_icsb_init_counters(mp);
+	if (error)
+		goto out_close_devices;
+
+	error = xfs_readsb(mp, flags);
+	if (error)
+		goto out_destroy_counters;
+
+	error = xfs_finish_flags(mp);
+	if (error)
+		goto out_free_sb;
+
+	error = xfs_setup_devices(mp);
+	if (error)
+		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.
+	 * For the same reason we must also initialise the syncd and register
+	 * the inode cache shrinker so that inodes can be reclaimed during
+	 * operations like a quotacheck that iterate all inodes in the
+	 * filesystem.
+	 */
+	sb->s_magic = XFS_SB_MAGIC;
+	sb->s_blocksize = mp->m_sb.sb_blocksize;
+	sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
+	sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);
+	sb->s_time_gran = 1;
+	set_posix_acl_flag(sb);
+
+	error = xfs_mountfs(mp);
+	if (error)
+		goto out_filestream_unmount;
+
+	error = xfs_syncd_init(mp);
+	if (error)
+		goto out_unmount;
+
+	root = igrab(VFS_I(mp->m_rootip));
+	if (!root) {
+		error = ENOENT;
+		goto out_syncd_stop;
+	}
+	if (is_bad_inode(root)) {
+		error = EINVAL;
+		goto out_syncd_stop;
+	}
+	sb->s_root = d_alloc_root(root);
+	if (!sb->s_root) {
+		error = ENOMEM;
+		goto out_iput;
+	}
+
+	return 0;
+
+ out_filestream_unmount:
+	xfs_filestream_unmount(mp);
+ out_free_sb:
+	xfs_freesb(mp);
+ out_destroy_counters:
+	xfs_icsb_destroy_counters(mp);
+ out_close_devices:
+	xfs_close_devices(mp);
+ out_free_fsname:
+	xfs_free_fsname(mp);
+	kfree(mp);
+ out:
+	return -error;
+
+ out_iput:
+	iput(root);
+ out_syncd_stop:
+	xfs_syncd_stop(mp);
+ out_unmount:
+	/*
+	 * Blow away any referenced inode in the filestreams cache.
+	 * This can and will cause log traffic as inodes go inactive
+	 * here.
+	 */
+	xfs_filestream_unmount(mp);
+
+	XFS_bflush(mp->m_ddev_targp);
+
+	xfs_unmountfs(mp);
+	goto out_free_sb;
+}
+
+STATIC struct dentry *
+xfs_fs_mount(
+	struct file_system_type	*fs_type,
+	int			flags,
+	const char		*dev_name,
+	void			*data)
+{
+	return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super);
+}
+
+static int
+xfs_fs_nr_cached_objects(
+	struct super_block	*sb)
+{
+	return xfs_reclaim_inodes_count(XFS_M(sb));
+}
+
+static void
+xfs_fs_free_cached_objects(
+	struct super_block	*sb,
+	int			nr_to_scan)
+{
+	xfs_reclaim_inodes_nr(XFS_M(sb), nr_to_scan);
+}
+
+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,
+	.write_inode		= xfs_fs_write_inode,
+	.evict_inode		= xfs_fs_evict_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,
+	.remount_fs		= xfs_fs_remount,
+	.show_options		= xfs_fs_show_options,
+	.nr_cached_objects	= xfs_fs_nr_cached_objects,
+	.free_cached_objects	= xfs_fs_free_cached_objects,
+};
+
+static struct file_system_type xfs_fs_type = {
+	.owner			= THIS_MODULE,
+	.name			= "xfs",
+	.mount			= xfs_fs_mount,
+	.kill_sb		= kill_block_super,
+	.fs_flags		= FS_REQUIRES_DEV,
+};
+
+STATIC int __init
+xfs_init_zones(void)
+{
+
+	xfs_ioend_zone = kmem_zone_init(sizeof(xfs_ioend_t), "xfs_ioend");
+	if (!xfs_ioend_zone)
+		goto out;
+
+	xfs_ioend_pool = mempool_create_slab_pool(4 * MAX_BUF_PER_PAGE,
+						  xfs_ioend_zone);
+	if (!xfs_ioend_pool)
+		goto out_destroy_ioend_zone;
+
+	xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t),
+						"xfs_log_ticket");
+	if (!xfs_log_ticket_zone)
+		goto out_destroy_ioend_pool;
+
+	xfs_bmap_free_item_zone = kmem_zone_init(sizeof(xfs_bmap_free_item_t),
+						"xfs_bmap_free_item");
+	if (!xfs_bmap_free_item_zone)
+		goto out_destroy_log_ticket_zone;
+
+	xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
+						"xfs_btree_cur");
+	if (!xfs_btree_cur_zone)
+		goto out_destroy_bmap_free_item_zone;
+
+	xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t),
+						"xfs_da_state");
+	if (!xfs_da_state_zone)
+		goto out_destroy_btree_cur_zone;
+
+	xfs_dabuf_zone = kmem_zone_init(sizeof(xfs_dabuf_t), "xfs_dabuf");
+	if (!xfs_dabuf_zone)
+		goto out_destroy_da_state_zone;
+
+	xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
+	if (!xfs_ifork_zone)
+		goto out_destroy_dabuf_zone;
+
+	xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
+	if (!xfs_trans_zone)
+		goto out_destroy_ifork_zone;
+
+	xfs_log_item_desc_zone =
+		kmem_zone_init(sizeof(struct xfs_log_item_desc),
+			       "xfs_log_item_desc");
+	if (!xfs_log_item_desc_zone)
+		goto out_destroy_trans_zone;
+
+	/*
+	 * The size of the zone 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_zone = kmem_zone_init((sizeof(xfs_buf_log_item_t) +
+				(((XFS_MAX_BLOCKSIZE / XFS_BLF_CHUNK) /
+				  NBWORD) * sizeof(int))), "xfs_buf_item");
+	if (!xfs_buf_item_zone)
+		goto out_destroy_log_item_desc_zone;
+
+	xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) +
+			((XFS_EFD_MAX_FAST_EXTENTS - 1) *
+				 sizeof(xfs_extent_t))), "xfs_efd_item");
+	if (!xfs_efd_zone)
+		goto out_destroy_buf_item_zone;
+
+	xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) +
+			((XFS_EFI_MAX_FAST_EXTENTS - 1) *
+				sizeof(xfs_extent_t))), "xfs_efi_item");
+	if (!xfs_efi_zone)
+		goto out_destroy_efd_zone;
+
+	xfs_inode_zone =
+		kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode",
+			KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD,
+			xfs_fs_inode_init_once);
+	if (!xfs_inode_zone)
+		goto out_destroy_efi_zone;
+
+	xfs_ili_zone =
+		kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili",
+					KM_ZONE_SPREAD, NULL);
+	if (!xfs_ili_zone)
+		goto out_destroy_inode_zone;
+
+	return 0;
+
+ out_destroy_inode_zone:
+	kmem_zone_destroy(xfs_inode_zone);
+ out_destroy_efi_zone:
+	kmem_zone_destroy(xfs_efi_zone);
+ out_destroy_efd_zone:
+	kmem_zone_destroy(xfs_efd_zone);
+ out_destroy_buf_item_zone:
+	kmem_zone_destroy(xfs_buf_item_zone);
+ out_destroy_log_item_desc_zone:
+	kmem_zone_destroy(xfs_log_item_desc_zone);
+ out_destroy_trans_zone:
+	kmem_zone_destroy(xfs_trans_zone);
+ out_destroy_ifork_zone:
+	kmem_zone_destroy(xfs_ifork_zone);
+ out_destroy_dabuf_zone:
+	kmem_zone_destroy(xfs_dabuf_zone);
+ out_destroy_da_state_zone:
+	kmem_zone_destroy(xfs_da_state_zone);
+ out_destroy_btree_cur_zone:
+	kmem_zone_destroy(xfs_btree_cur_zone);
+ out_destroy_bmap_free_item_zone:
+	kmem_zone_destroy(xfs_bmap_free_item_zone);
+ out_destroy_log_ticket_zone:
+	kmem_zone_destroy(xfs_log_ticket_zone);
+ out_destroy_ioend_pool:
+	mempool_destroy(xfs_ioend_pool);
+ out_destroy_ioend_zone:
+	kmem_zone_destroy(xfs_ioend_zone);
+ out:
+	return -ENOMEM;
+}
+
+STATIC void
+xfs_destroy_zones(void)
+{
+	kmem_zone_destroy(xfs_ili_zone);
+	kmem_zone_destroy(xfs_inode_zone);
+	kmem_zone_destroy(xfs_efi_zone);
+	kmem_zone_destroy(xfs_efd_zone);
+	kmem_zone_destroy(xfs_buf_item_zone);
+	kmem_zone_destroy(xfs_log_item_desc_zone);
+	kmem_zone_destroy(xfs_trans_zone);
+	kmem_zone_destroy(xfs_ifork_zone);
+	kmem_zone_destroy(xfs_dabuf_zone);
+	kmem_zone_destroy(xfs_da_state_zone);
+	kmem_zone_destroy(xfs_btree_cur_zone);
+	kmem_zone_destroy(xfs_bmap_free_item_zone);
+	kmem_zone_destroy(xfs_log_ticket_zone);
+	mempool_destroy(xfs_ioend_pool);
+	kmem_zone_destroy(xfs_ioend_zone);
+
+}
+
+STATIC int __init
+xfs_init_workqueues(void)
+{
+	/*
+	 * max_active is set to 8 to give enough concurency to allow
+	 * multiple work operations on each CPU to run. This allows multiple
+	 * filesystems to be running sync work concurrently, and scales with
+	 * the number of CPUs in the system.
+	 */
+	xfs_syncd_wq = alloc_workqueue("xfssyncd", WQ_CPU_INTENSIVE, 8);
+	if (!xfs_syncd_wq)
+		goto out;
+
+	xfs_ail_wq = alloc_workqueue("xfsail", WQ_CPU_INTENSIVE, 8);
+	if (!xfs_ail_wq)
+		goto out_destroy_syncd;
+
+	return 0;
+
+out_destroy_syncd:
+	destroy_workqueue(xfs_syncd_wq);
+out:
+	return -ENOMEM;
+}
+
+STATIC void
+xfs_destroy_workqueues(void)
+{
+	destroy_workqueue(xfs_ail_wq);
+	destroy_workqueue(xfs_syncd_wq);
+}
+
+STATIC int __init
+init_xfs_fs(void)
+{
+	int			error;
+
+	printk(KERN_INFO XFS_VERSION_STRING " with "
+			 XFS_BUILD_OPTIONS " enabled\n");
+
+	xfs_ioend_init();
+	xfs_dir_startup();
+
+	error = xfs_init_zones();
+	if (error)
+		goto out;
+
+	error = xfs_init_workqueues();
+	if (error)
+		goto out_destroy_zones;
+
+	error = xfs_mru_cache_init();
+	if (error)
+		goto out_destroy_wq;
+
+	error = xfs_filestream_init();
+	if (error)
+		goto out_mru_cache_uninit;
+
+	error = xfs_buf_init();
+	if (error)
+		goto out_filestream_uninit;
+
+	error = xfs_init_procfs();
+	if (error)
+		goto out_buf_terminate;
+
+	error = xfs_sysctl_register();
+	if (error)
+		goto out_cleanup_procfs;
+
+	vfs_initquota();
+
+	error = register_filesystem(&xfs_fs_type);
+	if (error)
+		goto out_sysctl_unregister;
+	return 0;
+
+ out_sysctl_unregister:
+	xfs_sysctl_unregister();
+ out_cleanup_procfs:
+	xfs_cleanup_procfs();
+ out_buf_terminate:
+	xfs_buf_terminate();
+ out_filestream_uninit:
+	xfs_filestream_uninit();
+ out_mru_cache_uninit:
+	xfs_mru_cache_uninit();
+ out_destroy_wq:
+	xfs_destroy_workqueues();
+ out_destroy_zones:
+	xfs_destroy_zones();
+ out:
+	return error;
+}
+
+STATIC void __exit
+exit_xfs_fs(void)
+{
+	vfs_exitquota();
+	unregister_filesystem(&xfs_fs_type);
+	xfs_sysctl_unregister();
+	xfs_cleanup_procfs();
+	xfs_buf_terminate();
+	xfs_filestream_uninit();
+	xfs_mru_cache_uninit();
+	xfs_destroy_workqueues();
+	xfs_destroy_zones();
+}
+
+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");