/*

   * 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;

  	/*
  	 * 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)) {

  			xfs_warn(mp,
  	"delaylog is the default now, option is deprecated.");

  		} else if (!strcmp(this_char, MNTOPT_NODELAYLOG)) {

  			xfs_warn(mp,

  	"nodelaylog support has been removed, option is deprecated.");

  		} 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;
  	}

  #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_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
  ", 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;

  	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_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_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 || wbc->for_kupdate) {

  		/*

  		 * 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 forces dramatically.

  		 */

  		error = xfs_log_dirty_inode(ip, NULL, 0);

  		if (error)
  			goto out;
  		return 0;

  	} else {

  		if (!ip->i_update_core)
  			return 0;

  		/*
  		 * 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_flush_buftarg(mp->m_ddev_targp, 1);

  	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;

  	/*

  	 * Doing anything during the async pass would be counterproductive.

  	 */

  	if (!wait)

  		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
  ", 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 dentry		*root)

  {

  	return -xfs_showargs(XFS_M(root->d_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_flush_buftarg(mp->m_ddev_targp, 1);

  	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)
  {
  	/*

  	 * We never want to the same work item to run twice, reclaiming inodes
  	 * or idling the log is not going to get any faster by multiple CPUs
  	 * competing for ressources.  Use the default large max_active value
  	 * so that even lots of filesystems can perform these task in parallel.

  	 */

  	xfs_syncd_wq = alloc_workqueue("xfssyncd", WQ_NON_REENTRANT, 0);

  	if (!xfs_syncd_wq)

  		return -ENOMEM;

  	return 0;

  }

  STATIC void

  xfs_destroy_workqueues(void)
  {

  	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
  ");

  	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");