[linux-2.6-omap-h63xx.git] / fs / xfs / linux-2.6 / xfs_super.c

/*
 * 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_clnt.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_dmapi.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_dir2_sf.h"
#include "xfs_attr_sf.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_rw.h"
#include "xfs_acl.h"
#include "xfs_attr.h"
#include "xfs_buf_item.h"
#include "xfs_utils.h"
#include "xfs_vnodeops.h"
#include "xfs_vfsops.h"
#include "xfs_version.h"
#include "xfs_log_priv.h"
#include "xfs_trans_priv.h"
#include "xfs_filestream.h"

#include <linux/namei.h>
#include <linux/init.h>
#include <linux/mount.h>
#include <linux/mempool.h>
#include <linux/writeback.h>
#include <linux/kthread.h>
#include <linux/freezer.h>

static struct quotactl_ops xfs_quotactl_operations;
static struct super_operations xfs_super_operations;
static kmem_zone_t *xfs_vnode_zone;
static kmem_zone_t *xfs_ioend_zone;
mempool_t *xfs_ioend_pool;

STATIC struct xfs_mount_args *
xfs_args_allocate(
        struct super_block      *sb,
        int                     silent)
{
        struct xfs_mount_args   *args;

        args = kmem_zalloc(sizeof(struct xfs_mount_args), KM_SLEEP);
        args->logbufs = args->logbufsize = -1;
        strncpy(args->fsname, sb->s_id, MAXNAMELEN);

        /* Copy the already-parsed mount(2) flags we're interested in */
        if (sb->s_flags & MS_DIRSYNC)
                args->flags |= XFSMNT_DIRSYNC;
        if (sb->s_flags & MS_SYNCHRONOUS)
                args->flags |= XFSMNT_WSYNC;
        if (silent)
                args->flags |= XFSMNT_QUIET;
        args->flags |= XFSMNT_32BITINODES;

        return args;
}

#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_INO64    "ino64"         /* force inodes into 64-bit range */
#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_OSYNCISOSYNC "osyncisosync" /* o_sync is REALLY o_sync */
#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_DMAPI    "dmapi"         /* DMI enabled (DMAPI / XDSM) */
#define MNTOPT_XDSM     "xdsm"          /* DMI enabled (DMAPI / XDSM) */
#define MNTOPT_DMI      "dmi"           /* DMI enabled (DMAPI / XDSM) */

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;
}

STATIC int
xfs_parseargs(
        struct xfs_mount        *mp,
        char                    *options,
        struct xfs_mount_args   *args,
        int                     update)
{
        char                    *this_char, *value, *eov;
        int                     dsunit, dswidth, vol_dsunit, vol_dswidth;
        int                     iosize;
        int                     dmapi_implies_ikeep = 1;

        args->flags |= XFSMNT_BARRIER;
        args->flags2 |= XFSMNT2_COMPAT_IOSIZE;

        if (!options)
                goto done;

        iosize = dsunit = dswidth = vol_dsunit = vol_dswidth = 0;

        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) {
                                cmn_err(CE_WARN,
                                        "XFS: %s option requires an argument",
                                        this_char);
                                return EINVAL;
                        }
                        args->logbufs = simple_strtoul(value, &eov, 10);
                } else if (!strcmp(this_char, MNTOPT_LOGBSIZE)) {
                        if (!value || !*value) {
                                cmn_err(CE_WARN,
                                        "XFS: %s option requires an argument",
                                        this_char);
                                return EINVAL;
                        }
                        args->logbufsize = suffix_strtoul(value, &eov, 10);
                } else if (!strcmp(this_char, MNTOPT_LOGDEV)) {
                        if (!value || !*value) {
                                cmn_err(CE_WARN,
                                        "XFS: %s option requires an argument",
                                        this_char);
                                return EINVAL;
                        }
                        strncpy(args->logname, value, MAXNAMELEN);
                } else if (!strcmp(this_char, MNTOPT_MTPT)) {
                        if (!value || !*value) {
                                cmn_err(CE_WARN,
                                        "XFS: %s option requires an argument",
                                        this_char);
                                return EINVAL;
                        }
                        strncpy(args->mtpt, value, MAXNAMELEN);
                } else if (!strcmp(this_char, MNTOPT_RTDEV)) {
                        if (!value || !*value) {
                                cmn_err(CE_WARN,
                                        "XFS: %s option requires an argument",
                                        this_char);
                                return EINVAL;
                        }
                        strncpy(args->rtname, value, MAXNAMELEN);
                } else if (!strcmp(this_char, MNTOPT_BIOSIZE)) {
                        if (!value || !*value) {
                                cmn_err(CE_WARN,
                                        "XFS: %s option requires an argument",
                                        this_char);
                                return EINVAL;
                        }
                        iosize = simple_strtoul(value, &eov, 10);
                        args->flags |= XFSMNT_IOSIZE;
                        args->iosizelog = (uint8_t) iosize;
                } else if (!strcmp(this_char, MNTOPT_ALLOCSIZE)) {
                        if (!value || !*value) {
                                cmn_err(CE_WARN,
                                        "XFS: %s option requires an argument",
                                        this_char);
                                return EINVAL;
                        }
                        iosize = suffix_strtoul(value, &eov, 10);
                        args->flags |= XFSMNT_IOSIZE;
                        args->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)) {
                        args->flags |= XFSMNT_WSYNC;
                } else if (!strcmp(this_char, MNTOPT_OSYNCISOSYNC)) {
                        args->flags |= XFSMNT_OSYNCISOSYNC;
                } else if (!strcmp(this_char, MNTOPT_NORECOVERY)) {
                        args->flags |= XFSMNT_NORECOVERY;
                } else if (!strcmp(this_char, MNTOPT_INO64)) {
                        args->flags |= XFSMNT_INO64;
#if !XFS_BIG_INUMS
                        cmn_err(CE_WARN,
                                "XFS: %s option not allowed on this system",
                                this_char);
                        return EINVAL;
#endif
                } else if (!strcmp(this_char, MNTOPT_NOALIGN)) {
                        args->flags |= XFSMNT_NOALIGN;
                } else if (!strcmp(this_char, MNTOPT_SWALLOC)) {
                        args->flags |= XFSMNT_SWALLOC;
                } else if (!strcmp(this_char, MNTOPT_SUNIT)) {
                        if (!value || !*value) {
                                cmn_err(CE_WARN,
                                        "XFS: %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) {
                                cmn_err(CE_WARN,
                                        "XFS: %s option requires an argument",
                                        this_char);
                                return EINVAL;
                        }
                        dswidth = simple_strtoul(value, &eov, 10);
                } else if (!strcmp(this_char, MNTOPT_64BITINODE)) {
                        args->flags &= ~XFSMNT_32BITINODES;
#if !XFS_BIG_INUMS
                        cmn_err(CE_WARN,
                                "XFS: %s option not allowed on this system",
                                this_char);
                        return EINVAL;
#endif
                } else if (!strcmp(this_char, MNTOPT_NOUUID)) {
                        args->flags |= XFSMNT_NOUUID;
                } else if (!strcmp(this_char, MNTOPT_BARRIER)) {
                        args->flags |= XFSMNT_BARRIER;
                } else if (!strcmp(this_char, MNTOPT_NOBARRIER)) {
                        args->flags &= ~XFSMNT_BARRIER;
                } else if (!strcmp(this_char, MNTOPT_IKEEP)) {
                        args->flags |= XFSMNT_IKEEP;
                } else if (!strcmp(this_char, MNTOPT_NOIKEEP)) {
                        dmapi_implies_ikeep = 0;
                        args->flags &= ~XFSMNT_IKEEP;
                } else if (!strcmp(this_char, MNTOPT_LARGEIO)) {
                        args->flags2 &= ~XFSMNT2_COMPAT_IOSIZE;
                } else if (!strcmp(this_char, MNTOPT_NOLARGEIO)) {
                        args->flags2 |= XFSMNT2_COMPAT_IOSIZE;
                } else if (!strcmp(this_char, MNTOPT_ATTR2)) {
                        args->flags |= XFSMNT_ATTR2;
                } else if (!strcmp(this_char, MNTOPT_NOATTR2)) {
                        args->flags &= ~XFSMNT_ATTR2;
                        args->flags |= XFSMNT_NOATTR2;
                } else if (!strcmp(this_char, MNTOPT_FILESTREAM)) {
                        args->flags2 |= XFSMNT2_FILESTREAMS;
                } else if (!strcmp(this_char, MNTOPT_NOQUOTA)) {
                        args->flags &= ~(XFSMNT_UQUOTAENF|XFSMNT_UQUOTA);
                        args->flags &= ~(XFSMNT_GQUOTAENF|XFSMNT_GQUOTA);
                } else if (!strcmp(this_char, MNTOPT_QUOTA) ||
                           !strcmp(this_char, MNTOPT_UQUOTA) ||
                           !strcmp(this_char, MNTOPT_USRQUOTA)) {
                        args->flags |= XFSMNT_UQUOTA | XFSMNT_UQUOTAENF;
                } else if (!strcmp(this_char, MNTOPT_QUOTANOENF) ||
                           !strcmp(this_char, MNTOPT_UQUOTANOENF)) {
                        args->flags |= XFSMNT_UQUOTA;
                        args->flags &= ~XFSMNT_UQUOTAENF;
                } else if (!strcmp(this_char, MNTOPT_PQUOTA) ||
                           !strcmp(this_char, MNTOPT_PRJQUOTA)) {
                        args->flags |= XFSMNT_PQUOTA | XFSMNT_PQUOTAENF;
                } else if (!strcmp(this_char, MNTOPT_PQUOTANOENF)) {
                        args->flags |= XFSMNT_PQUOTA;
                        args->flags &= ~XFSMNT_PQUOTAENF;
                } else if (!strcmp(this_char, MNTOPT_GQUOTA) ||
                           !strcmp(this_char, MNTOPT_GRPQUOTA)) {
                        args->flags |= XFSMNT_GQUOTA | XFSMNT_GQUOTAENF;
                } else if (!strcmp(this_char, MNTOPT_GQUOTANOENF)) {
                        args->flags |= XFSMNT_GQUOTA;
                        args->flags &= ~XFSMNT_GQUOTAENF;
                } else if (!strcmp(this_char, MNTOPT_DMAPI)) {
                        args->flags |= XFSMNT_DMAPI;
                } else if (!strcmp(this_char, MNTOPT_XDSM)) {
                        args->flags |= XFSMNT_DMAPI;
                } else if (!strcmp(this_char, MNTOPT_DMI)) {
                        args->flags |= XFSMNT_DMAPI;
                } else if (!strcmp(this_char, "ihashsize")) {
                        cmn_err(CE_WARN,
        "XFS: ihashsize no longer used, option is deprecated.");
                } else if (!strcmp(this_char, "osyncisdsync")) {
                        /* no-op, this is now the default */
                        cmn_err(CE_WARN,
        "XFS: osyncisdsync is now the default, option is deprecated.");
                } else if (!strcmp(this_char, "irixsgid")) {
                        cmn_err(CE_WARN,
        "XFS: irixsgid is now a sysctl(2) variable, option is deprecated.");
                } else {
                        cmn_err(CE_WARN,
                                "XFS: unknown mount option [%s].", this_char);
                        return EINVAL;
                }
        }

        if (args->flags & XFSMNT_NORECOVERY) {
                if ((mp->m_flags & XFS_MOUNT_RDONLY) == 0) {
                        cmn_err(CE_WARN,
                                "XFS: no-recovery mounts must be read-only.");
                        return EINVAL;
                }
        }

        if ((args->flags & XFSMNT_NOALIGN) && (dsunit || dswidth)) {
                cmn_err(CE_WARN,
        "XFS: sunit and swidth options incompatible with the noalign option");
                return EINVAL;
        }

        if ((args->flags & XFSMNT_GQUOTA) && (args->flags & XFSMNT_PQUOTA)) {
                cmn_err(CE_WARN,
                        "XFS: cannot mount with both project and group quota");
                return EINVAL;
        }

        if ((args->flags & XFSMNT_DMAPI) && *args->mtpt == '\0') {
                printk("XFS: %s option needs the mount point option as well\n",
                        MNTOPT_DMAPI);
                return EINVAL;
        }

        if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
                cmn_err(CE_WARN,
                        "XFS: sunit and swidth must be specified together");
                return EINVAL;
        }

        if (dsunit && (dswidth % dsunit != 0)) {
                cmn_err(CE_WARN,
        "XFS: stripe width (%d) must be a multiple of the stripe unit (%d)",
                        dswidth, dsunit);
                return EINVAL;
        }

        /*
         * Applications using DMI filesystems often expect the
         * inode generation number to be monotonically increasing.
         * If we delete inode chunks we break this assumption, so
         * keep unused inode chunks on disk for DMI filesystems
         * until we come up with a better solution.
         * Note that if "ikeep" or "noikeep" mount options are
         * supplied, then they are honored.
         */
        if ((args->flags & XFSMNT_DMAPI) && dmapi_implies_ikeep)
                args->flags |= XFSMNT_IKEEP;

        if ((args->flags & XFSMNT_NOALIGN) != XFSMNT_NOALIGN) {
                if (dsunit) {
                        args->sunit = dsunit;
                        args->flags |= XFSMNT_RETERR;
                } else {
                        args->sunit = vol_dsunit;
                }
                dswidth ? (args->swidth = dswidth) :
                          (args->swidth = vol_dswidth);
        } else {
                args->sunit = args->swidth = 0;
        }

done:
        if (args->flags & XFSMNT_32BITINODES)
                mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
        if (args->flags2)
                args->flags |= XFSMNT_FLAGS2;
        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_INO64,              "," MNTOPT_INO64 },
                { XFS_MOUNT_NOALIGN,            "," MNTOPT_NOALIGN },
                { XFS_MOUNT_SWALLOC,            "," MNTOPT_SWALLOC },
                { XFS_MOUNT_NOUUID,             "," MNTOPT_NOUUID },
                { XFS_MOUNT_NORECOVERY,         "," MNTOPT_NORECOVERY },
                { XFS_MOUNT_OSYNCISOSYNC,       "," MNTOPT_OSYNCISOSYNC },
                { XFS_MOUNT_ATTR2,              "," MNTOPT_ATTR2 },
                { XFS_MOUNT_FILESTREAMS,        "," MNTOPT_FILESTREAM },
                { XFS_MOUNT_DMAPI,              "," MNTOPT_DMAPI },
                { XFS_MOUNT_GRPID,              "," MNTOPT_GRPID },
                { 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);

        if (mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_OQUOTA_ENFD))
                seq_puts(m, "," MNTOPT_PRJQUOTA);
        else if (mp->m_qflags & XFS_PQUOTA_ACCT)
                seq_puts(m, "," MNTOPT_PQUOTANOENF);

        if (mp->m_qflags & (XFS_GQUOTA_ACCT|XFS_OQUOTA_ENFD))
                seq_puts(m, "," MNTOPT_GRPQUOTA);
        else if (mp->m_qflags & XFS_GQUOTA_ACCT)
                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_prepare_write 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_LBD)
        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_INLINE void
xfs_set_inodeops(
        struct inode            *inode)
{
        switch (inode->i_mode & S_IFMT) {
        case S_IFREG:
                inode->i_op = &xfs_inode_operations;
                inode->i_fop = &xfs_file_operations;
                inode->i_mapping->a_ops = &xfs_address_space_operations;
                break;
        case S_IFDIR:
                inode->i_op = &xfs_dir_inode_operations;
                inode->i_fop = &xfs_dir_file_operations;
                break;
        case S_IFLNK:
                inode->i_op = &xfs_symlink_inode_operations;
                if (!(XFS_I(inode)->i_df.if_flags & XFS_IFINLINE))
                        inode->i_mapping->a_ops = &xfs_address_space_operations;
                break;
        default:
                inode->i_op = &xfs_inode_operations;
                init_special_inode(inode, inode->i_mode, inode->i_rdev);
                break;
        }
}

STATIC_INLINE void
xfs_revalidate_inode(
        xfs_mount_t             *mp,
        bhv_vnode_t             *vp,
        xfs_inode_t             *ip)
{
        struct inode            *inode = vn_to_inode(vp);

        inode->i_mode   = ip->i_d.di_mode;
        inode->i_nlink  = ip->i_d.di_nlink;
        inode->i_uid    = ip->i_d.di_uid;
        inode->i_gid    = ip->i_d.di_gid;

        switch (inode->i_mode & S_IFMT) {
        case S_IFBLK:
        case S_IFCHR:
                inode->i_rdev =
                        MKDEV(sysv_major(ip->i_df.if_u2.if_rdev) & 0x1ff,
                              sysv_minor(ip->i_df.if_u2.if_rdev));
                break;
        default:
                inode->i_rdev = 0;
                break;
        }

        inode->i_generation = ip->i_d.di_gen;
        i_size_write(inode, ip->i_d.di_size);
        inode->i_atime.tv_sec   = ip->i_d.di_atime.t_sec;
        inode->i_atime.tv_nsec  = ip->i_d.di_atime.t_nsec;
        inode->i_mtime.tv_sec   = ip->i_d.di_mtime.t_sec;
        inode->i_mtime.tv_nsec  = ip->i_d.di_mtime.t_nsec;
        inode->i_ctime.tv_sec   = ip->i_d.di_ctime.t_sec;
        inode->i_ctime.tv_nsec  = ip->i_d.di_ctime.t_nsec;
        if (ip->i_d.di_flags & XFS_DIFLAG_IMMUTABLE)
                inode->i_flags |= S_IMMUTABLE;
        else
                inode->i_flags &= ~S_IMMUTABLE;
        if (ip->i_d.di_flags & XFS_DIFLAG_APPEND)
                inode->i_flags |= S_APPEND;
        else
                inode->i_flags &= ~S_APPEND;
        if (ip->i_d.di_flags & XFS_DIFLAG_SYNC)
                inode->i_flags |= S_SYNC;
        else
                inode->i_flags &= ~S_SYNC;
        if (ip->i_d.di_flags & XFS_DIFLAG_NOATIME)
                inode->i_flags |= S_NOATIME;
        else
                inode->i_flags &= ~S_NOATIME;
        xfs_iflags_clear(ip, XFS_IMODIFIED);
}

void
xfs_initialize_vnode(
        struct xfs_mount        *mp,
        bhv_vnode_t             *vp,
        struct xfs_inode        *ip)
{
        struct inode            *inode = vn_to_inode(vp);

        if (!ip->i_vnode) {
                ip->i_vnode = vp;
                inode->i_private = ip;
        }

        /*
         * We need to set the ops vectors, and unlock the inode, but if
         * we have been called during the new inode create process, it is
         * too early to fill in the Linux inode.  We will get called a
         * second time once the inode is properly set up, and then we can
         * finish our work.
         */
        if (ip->i_d.di_mode != 0 && (inode->i_state & I_NEW)) {
                xfs_revalidate_inode(mp, vp, ip);
                xfs_set_inodeops(inode);

                xfs_iflags_clear(ip, XFS_INEW);
                barrier();

                unlock_new_inode(inode);
        }
}

int
xfs_blkdev_get(
        xfs_mount_t             *mp,
        const char              *name,
        struct block_device     **bdevp)
{
        int                     error = 0;

        *bdevp = open_bdev_excl(name, 0, mp);
        if (IS_ERR(*bdevp)) {
                error = PTR_ERR(*bdevp);
                printk("XFS: Invalid device [%s], error=%d\n", name, error);
        }

        return -error;
}

void
xfs_blkdev_put(
        struct block_device     *bdev)
{
        if (bdev)
                close_bdev_excl(bdev);
}

/*
 * Try to write out the superblock using barriers.
 */
STATIC int
xfs_barrier_test(
        xfs_mount_t     *mp)
{
        xfs_buf_t       *sbp = xfs_getsb(mp, 0);
        int             error;

        XFS_BUF_UNDONE(sbp);
        XFS_BUF_UNREAD(sbp);
        XFS_BUF_UNDELAYWRITE(sbp);
        XFS_BUF_WRITE(sbp);
        XFS_BUF_UNASYNC(sbp);
        XFS_BUF_ORDERED(sbp);

        xfsbdstrat(mp, sbp);
        error = xfs_iowait(sbp);

        /*
         * Clear all the flags we set and possible error state in the
         * buffer.  We only did the write to try out whether barriers
         * worked and shouldn't leave any traces in the superblock
         * buffer.
         */
        XFS_BUF_DONE(sbp);
        XFS_BUF_ERROR(sbp, 0);
        XFS_BUF_UNORDERED(sbp);

        xfs_buf_relse(sbp);
        return error;
}

void
xfs_mountfs_check_barriers(xfs_mount_t *mp)
{
        int error;

        if (mp->m_logdev_targp != mp->m_ddev_targp) {
                xfs_fs_cmn_err(CE_NOTE, mp,
                  "Disabling barriers, not supported with external log device");
                mp->m_flags &= ~XFS_MOUNT_BARRIER;
                return;
        }

        if (mp->m_ddev_targp->bt_bdev->bd_disk->queue->ordered ==
                                        QUEUE_ORDERED_NONE) {
                xfs_fs_cmn_err(CE_NOTE, mp,
                  "Disabling barriers, not supported by the underlying device");
                mp->m_flags &= ~XFS_MOUNT_BARRIER;
                return;
        }

        if (xfs_readonly_buftarg(mp->m_ddev_targp)) {
                xfs_fs_cmn_err(CE_NOTE, mp,
                  "Disabling barriers, underlying device is readonly");
                mp->m_flags &= ~XFS_MOUNT_BARRIER;
                return;
        }

        error = xfs_barrier_test(mp);
        if (error) {
                xfs_fs_cmn_err(CE_NOTE, mp,
                  "Disabling barriers, trial barrier write failed");
                mp->m_flags &= ~XFS_MOUNT_BARRIER;
                return;
        }
}

void
xfs_blkdev_issue_flush(
        xfs_buftarg_t           *buftarg)
{
        blkdev_issue_flush(buftarg->bt_bdev, NULL);
}

STATIC void
xfs_close_devices(
        struct xfs_mount        *mp)
{
        if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
                xfs_free_buftarg(mp->m_logdev_targp);
                xfs_blkdev_put(mp->m_logdev_targp->bt_bdev);
        }
        if (mp->m_rtdev_targp) {
                xfs_free_buftarg(mp->m_rtdev_targp);
                xfs_blkdev_put(mp->m_rtdev_targp->bt_bdev);
        }
        xfs_free_buftarg(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 xfs_mount_args   *args)
{
        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 (args->logname[0]) {
                error = xfs_blkdev_get(mp, args->logname, &logdev);
                if (error)
                        goto out;
        }

        if (args->rtname[0]) {
                error = xfs_blkdev_get(mp, args->rtname, &rtdev);
                if (error)
                        goto out_close_logdev;

                if (rtdev == ddev || rtdev == logdev) {
                        cmn_err(CE_WARN,
        "XFS: 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(ddev, 0);
        if (!mp->m_ddev_targp)
                goto out_close_rtdev;

        if (rtdev) {
                mp->m_rtdev_targp = xfs_alloc_buftarg(rtdev, 1);
                if (!mp->m_rtdev_targp)
                        goto out_free_ddev_targ;
        }

        if (logdev && logdev != ddev) {
                mp->m_logdev_targp = xfs_alloc_buftarg(logdev, 1);
                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->m_rtdev_targp);
 out_free_ddev_targ:
        xfs_free_buftarg(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;
}



/*
 * XFS AIL push thread support
 */
void
xfsaild_wakeup(
        xfs_mount_t             *mp,
        xfs_lsn_t               threshold_lsn)
{
        mp->m_ail.xa_target = threshold_lsn;
        wake_up_process(mp->m_ail.xa_task);
}

int
xfsaild(
        void    *data)
{
        xfs_mount_t     *mp = (xfs_mount_t *)data;
        xfs_lsn_t       last_pushed_lsn = 0;
        long            tout = 0;

        while (!kthread_should_stop()) {
                if (tout)
                        schedule_timeout_interruptible(msecs_to_jiffies(tout));
                tout = 1000;

                /* swsusp */
                try_to_freeze();

                ASSERT(mp->m_log);
                if (XFS_FORCED_SHUTDOWN(mp))
                        continue;

                tout = xfsaild_push(mp, &last_pushed_lsn);
        }

        return 0;
}       /* xfsaild */

int
xfsaild_start(
        xfs_mount_t     *mp)
{
        mp->m_ail.xa_target = 0;
        mp->m_ail.xa_task = kthread_run(xfsaild, mp, "xfsaild");
        if (IS_ERR(mp->m_ail.xa_task))
                return -PTR_ERR(mp->m_ail.xa_task);
        return 0;
}

void
xfsaild_stop(
        xfs_mount_t     *mp)
{
        kthread_stop(mp->m_ail.xa_task);
}



STATIC struct inode *
xfs_fs_alloc_inode(
        struct super_block      *sb)
{
        bhv_vnode_t             *vp;

        vp = kmem_zone_alloc(xfs_vnode_zone, KM_SLEEP);
        if (unlikely(!vp))
                return NULL;
        return vn_to_inode(vp);
}

STATIC void
xfs_fs_destroy_inode(
        struct inode            *inode)
{
        kmem_zone_free(xfs_vnode_zone, vn_from_inode(inode));
}

STATIC void
xfs_fs_inode_init_once(
        void                    *vnode)
{
        inode_init_once(vn_to_inode((bhv_vnode_t *)vnode));
}

STATIC int __init
xfs_init_zones(void)
{
        xfs_vnode_zone = kmem_zone_init_flags(sizeof(bhv_vnode_t), "xfs_vnode",
                                        KM_ZONE_HWALIGN | KM_ZONE_RECLAIM |
                                        KM_ZONE_SPREAD,
                                        xfs_fs_inode_init_once);
        if (!xfs_vnode_zone)
                goto out;

        xfs_ioend_zone = kmem_zone_init(sizeof(xfs_ioend_t), "xfs_ioend");
        if (!xfs_ioend_zone)
                goto out_destroy_vnode_zone;

        xfs_ioend_pool = mempool_create_slab_pool(4 * MAX_BUF_PER_PAGE,
                                                  xfs_ioend_zone);
        if (!xfs_ioend_pool)
                goto out_free_ioend_zone;
        return 0;

 out_free_ioend_zone:
        kmem_zone_destroy(xfs_ioend_zone);
 out_destroy_vnode_zone:
        kmem_zone_destroy(xfs_vnode_zone);
 out:
        return -ENOMEM;
}

STATIC void
xfs_destroy_zones(void)
{
        mempool_destroy(xfs_ioend_pool);
        kmem_zone_destroy(xfs_vnode_zone);
        kmem_zone_destroy(xfs_ioend_zone);
}

/*
 * Attempt to flush the inode, this will actually fail
 * if the inode is pinned, but we dirty the inode again
 * at the point when it is unpinned after a log write,
 * since this is when the inode itself becomes flushable.
 */
STATIC int
xfs_fs_write_inode(
        struct inode            *inode,
        int                     sync)
{
        int                     error = 0;
        int                     flags = 0;

        xfs_itrace_entry(XFS_I(inode));
        if (sync) {
                filemap_fdatawait(inode->i_mapping);
                flags |= FLUSH_SYNC;
        }
        error = xfs_inode_flush(XFS_I(inode), flags);
        /*
         * if we failed to write out the inode then mark
         * it dirty again so we'll try again later.
         */
        if (error)
                mark_inode_dirty_sync(inode);

        return -error;
}

STATIC void
xfs_fs_clear_inode(
        struct inode            *inode)
{
        xfs_inode_t             *ip = XFS_I(inode);

        /*
         * ip can be null when xfs_iget_core calls xfs_idestroy if we
         * find an inode with di_mode == 0 but without IGET_CREATE set.
         */
        if (ip) {
                xfs_itrace_entry(ip);
                XFS_STATS_INC(vn_rele);
                XFS_STATS_INC(vn_remove);
                XFS_STATS_INC(vn_reclaim);
                XFS_STATS_DEC(vn_active);

                xfs_inactive(ip);
                xfs_iflags_clear(ip, XFS_IMODIFIED);
                if (xfs_reclaim(ip))
                        panic("%s: cannot reclaim 0x%p\n", __func__, inode);
        }

        ASSERT(XFS_I(inode) == NULL);
}

/*
 * Enqueue a work item to be picked up by the vfs xfssyncd thread.
 * Doing this has two advantages:
 * - It saves on stack space, which is tight in certain situations
 * - It can be used (with care) as a mechanism to avoid deadlocks.
 * Flushing while allocating in a full filesystem requires both.
 */
STATIC void
xfs_syncd_queue_work(
        struct xfs_mount *mp,
        void            *data,
        void            (*syncer)(struct xfs_mount *, void *))
{
        struct bhv_vfs_sync_work *work;

        work = kmem_alloc(sizeof(struct bhv_vfs_sync_work), KM_SLEEP);
        INIT_LIST_HEAD(&work->w_list);
        work->w_syncer = syncer;
        work->w_data = data;
        work->w_mount = mp;
        spin_lock(&mp->m_sync_lock);
        list_add_tail(&work->w_list, &mp->m_sync_list);
        spin_unlock(&mp->m_sync_lock);
        wake_up_process(mp->m_sync_task);
}

/*
 * Flush delayed allocate data, attempting to free up reserved space
 * from existing allocations.  At this point a new allocation attempt
 * has failed with ENOSPC and we are in the process of scratching our
 * heads, looking about for more room...
 */
STATIC void
xfs_flush_inode_work(
        struct xfs_mount *mp,
        void            *arg)
{
        struct inode    *inode = arg;
        filemap_flush(inode->i_mapping);
        iput(inode);
}

void
xfs_flush_inode(
        xfs_inode_t     *ip)
{
        struct inode    *inode = ip->i_vnode;

        igrab(inode);
        xfs_syncd_queue_work(ip->i_mount, inode, xfs_flush_inode_work);
        delay(msecs_to_jiffies(500));
}

/*
 * This is the "bigger hammer" version of xfs_flush_inode_work...
 * (IOW, "If at first you don't succeed, use a Bigger Hammer").
 */
STATIC void
xfs_flush_device_work(
        struct xfs_mount *mp,
        void            *arg)
{
        struct inode    *inode = arg;
        sync_blockdev(mp->m_super->s_bdev);
        iput(inode);
}

void
xfs_flush_device(
        xfs_inode_t     *ip)
{
        struct inode    *inode = vn_to_inode(XFS_ITOV(ip));

        igrab(inode);
        xfs_syncd_queue_work(ip->i_mount, inode, xfs_flush_device_work);
        delay(msecs_to_jiffies(500));
        xfs_log_force(ip->i_mount, (xfs_lsn_t)0, XFS_LOG_FORCE|XFS_LOG_SYNC);
}

STATIC void
xfs_sync_worker(
        struct xfs_mount *mp,
        void            *unused)
{
        int             error;

        if (!(mp->m_flags & XFS_MOUNT_RDONLY))
                error = xfs_sync(mp, SYNC_FSDATA | SYNC_BDFLUSH | SYNC_ATTR);
        mp->m_sync_seq++;
        wake_up(&mp->m_wait_single_sync_task);
}

STATIC int
xfssyncd(
        void                    *arg)
{
        struct xfs_mount        *mp = arg;
        long                    timeleft;
        bhv_vfs_sync_work_t     *work, *n;
        LIST_HEAD               (tmp);

        set_freezable();
        timeleft = xfs_syncd_centisecs * msecs_to_jiffies(10);
        for (;;) {
                timeleft = schedule_timeout_interruptible(timeleft);
                /* swsusp */
                try_to_freeze();
                if (kthread_should_stop() && list_empty(&mp->m_sync_list))
                        break;

                spin_lock(&mp->m_sync_lock);
                /*
                 * We can get woken by laptop mode, to do a sync -
                 * that's the (only!) case where the list would be
                 * empty with time remaining.
                 */
                if (!timeleft || list_empty(&mp->m_sync_list)) {
                        if (!timeleft)
                                timeleft = xfs_syncd_centisecs *
                                                        msecs_to_jiffies(10);
                        INIT_LIST_HEAD(&mp->m_sync_work.w_list);
                        list_add_tail(&mp->m_sync_work.w_list,
                                        &mp->m_sync_list);
                }
                list_for_each_entry_safe(work, n, &mp->m_sync_list, w_list)
                        list_move(&work->w_list, &tmp);
                spin_unlock(&mp->m_sync_lock);

                list_for_each_entry_safe(work, n, &tmp, w_list) {
                        (*work->w_syncer)(mp, work->w_data);
                        list_del(&work->w_list);
                        if (work == &mp->m_sync_work)
                                continue;
                        kmem_free(work);
                }
        }

        return 0;
}

STATIC void
xfs_fs_put_super(
        struct super_block      *sb)
{
        struct xfs_mount        *mp = XFS_M(sb);
        struct xfs_inode        *rip = mp->m_rootip;
        int                     unmount_event_flags = 0;
        int                     error;

        kthread_stop(mp->m_sync_task);

        xfs_sync(mp, SYNC_ATTR | SYNC_DELWRI);

#ifdef HAVE_DMAPI
        if (mp->m_flags & XFS_MOUNT_DMAPI) {
                unmount_event_flags =
                        (mp->m_dmevmask & (1 << DM_EVENT_UNMOUNT)) ?
                                0 : DM_FLAGS_UNWANTED;
                /*
                 * Ignore error from dmapi here, first unmount is not allowed
                 * to fail anyway, and second we wouldn't want to fail a
                 * unmount because of dmapi.
                 */
                XFS_SEND_PREUNMOUNT(mp, rip, DM_RIGHT_NULL, rip, DM_RIGHT_NULL,
                                NULL, NULL, 0, 0, unmount_event_flags);
        }
#endif

        /*
         * 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);
        error = xfs_unmount_flush(mp, 0);
        WARN_ON(error);

        IRELE(rip);

        /*
         * If we're forcing a shutdown, typically because of a media error,
         * we want to make sure we invalidate dirty pages that belong to
         * referenced vnodes as well.
         */
        if (XFS_FORCED_SHUTDOWN(mp)) {
                error = xfs_sync(mp, SYNC_WAIT | SYNC_CLOSE);
                ASSERT(error != EFSCORRUPTED);
        }

        if (mp->m_flags & XFS_MOUNT_DMAPI) {
                XFS_SEND_UNMOUNT(mp, rip, DM_RIGHT_NULL, 0, 0,
                                unmount_event_flags);
        }

        xfs_unmountfs(mp);
        xfs_close_devices(mp);
        xfs_qmops_put(mp);
        xfs_dmops_put(mp);
        kmem_free(mp);
}

STATIC void
xfs_fs_write_super(
        struct super_block      *sb)
{
        if (!(sb->s_flags & MS_RDONLY))
                xfs_sync(XFS_M(sb), SYNC_FSDATA);
        sb->s_dirt = 0;
}

STATIC int
xfs_fs_sync_super(
        struct super_block      *sb,
        int                     wait)
{
        struct xfs_mount        *mp = XFS_M(sb);
        int                     error;
        int                     flags;

        /*
         * Treat a sync operation like a freeze.  This is to work
         * around a race in sync_inodes() which works in two phases
         * - an asynchronous flush, which can write out an inode
         * without waiting for file size updates to complete, and a
         * synchronous flush, which wont do anything because the
         * async flush removed the inode's dirty flag.  Also
         * sync_inodes() will not see any files that just have
         * outstanding transactions to be flushed because we don't
         * dirty the Linux inode until after the transaction I/O
         * completes.
         */
        if (wait || unlikely(sb->s_frozen == SB_FREEZE_WRITE)) {
                /*
                 * First stage of freeze - no more writers will make progress
                 * now we are here, so we flush delwri and delalloc buffers
                 * here, then wait for all I/O to complete.  Data is frozen at
                 * that point. Metadata is not frozen, transactions can still
                 * occur here so don't bother flushing the buftarg (i.e
                 * SYNC_QUIESCE) because it'll just get dirty again.
                 */
                flags = SYNC_DATA_QUIESCE;
        } else
                flags = SYNC_FSDATA;

        error = xfs_sync(mp, flags);
        sb->s_dirt = 0;

        if (unlikely(laptop_mode)) {
                int     prev_sync_seq = mp->m_sync_seq;

                /*
                 * 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).
                 */
                wake_up_process(mp->m_sync_task);
                /*
                 * We have to wait for the sync iteration to complete.
                 * If we don't, the disk activity caused by the sync
                 * will come after the sync is completed, and that
                 * triggers another sync from laptop mode.
                 */
                wait_event(mp->m_wait_single_sync_task,
                                mp->m_sync_seq != prev_sync_seq);
        }

        return -error;
}

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;
        __uint64_t              fakeinos, id;
        xfs_extlen_t            lsize;

        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;
#if XFS_BIG_INUMS
        fakeinos += mp->m_inoadd;
#endif
        statp->f_files =
            MIN(sbp->sb_icount + fakeinos, (__uint64_t)XFS_MAXINUMBER);
        if (mp->m_maxicount)
#if XFS_BIG_INUMS
                if (!mp->m_inoadd)
#endif
                        statp->f_files = min_t(typeof(statp->f_files),
                                                statp->f_files,
                                                mp->m_maxicount);
        statp->f_ffree = statp->f_files - (sbp->sb_icount - sbp->sb_ifree);
        spin_unlock(&mp->m_sb_lock);

        XFS_QM_DQSTATVFS(XFS_I(dentry->d_inode), statp);
        return 0;
}

STATIC int
xfs_fs_remount(
        struct super_block      *sb,
        int                     *flags,
        char                    *options)
{
        struct xfs_mount        *mp = XFS_M(sb);
        struct xfs_mount_args   *args = xfs_args_allocate(sb, 0);
        int                     error;

        error = xfs_parseargs(mp, options, args, 1);
        if (error)
                goto out_free_args;

        if (!(*flags & MS_RDONLY)) {                    /* rw/ro -> rw */
                if (mp->m_flags & XFS_MOUNT_RDONLY)
                mp->m_flags &= ~XFS_MOUNT_RDONLY;
                if (args->flags & XFSMNT_BARRIER) {
                        mp->m_flags |= XFS_MOUNT_BARRIER;
                        xfs_mountfs_check_barriers(mp);
                } else {
                        mp->m_flags &= ~XFS_MOUNT_BARRIER;
                }
        } else if (!(mp->m_flags & XFS_MOUNT_RDONLY)) { /* rw -> ro */
                xfs_filestream_flush(mp);
                xfs_sync(mp, SYNC_DATA_QUIESCE);
                xfs_attr_quiesce(mp);
                mp->m_flags |= XFS_MOUNT_RDONLY;
        }

 out_free_args:
        kmem_free(args);
        return -error;
}

/*
 * Second stage of a freeze. The data is already frozen so we only
 * need to take care of themetadata. Once that's done write a dummy
 * record to dirty the log in case of a crash while frozen.
 */
STATIC void
xfs_fs_lockfs(
        struct super_block      *sb)
{
        struct xfs_mount        *mp = XFS_M(sb);

        xfs_attr_quiesce(mp);
        xfs_fs_log_dummy(mp);
}

STATIC int
xfs_fs_show_options(
        struct seq_file         *m,
        struct vfsmount         *mnt)
{
        return -xfs_showargs(XFS_M(mnt->mnt_sb), m);
}

STATIC int
xfs_fs_quotasync(
        struct super_block      *sb,
        int                     type)
{
        return -XFS_QM_QUOTACTL(XFS_M(sb), Q_XQUOTASYNC, 0, NULL);
}

STATIC int
xfs_fs_getxstate(
        struct super_block      *sb,
        struct fs_quota_stat    *fqs)
{
        return -XFS_QM_QUOTACTL(XFS_M(sb), Q_XGETQSTAT, 0, (caddr_t)fqs);
}

STATIC int
xfs_fs_setxstate(
        struct super_block      *sb,
        unsigned int            flags,
        int                     op)
{
        return -XFS_QM_QUOTACTL(XFS_M(sb), op, 0, (caddr_t)&flags);
}

STATIC int
xfs_fs_getxquota(
        struct super_block      *sb,
        int                     type,
        qid_t                   id,
        struct fs_disk_quota    *fdq)
{
        return -XFS_QM_QUOTACTL(XFS_M(sb),
                                 (type == USRQUOTA) ? Q_XGETQUOTA :
                                  ((type == GRPQUOTA) ? Q_XGETGQUOTA :
                                   Q_XGETPQUOTA), id, (caddr_t)fdq);
}

STATIC int
xfs_fs_setxquota(
        struct super_block      *sb,
        int                     type,
        qid_t                   id,
        struct fs_disk_quota    *fdq)
{
        return -XFS_QM_QUOTACTL(XFS_M(sb),
                                 (type == USRQUOTA) ? Q_XSETQLIM :
                                  ((type == GRPQUOTA) ? Q_XSETGQLIM :
                                   Q_XSETPQLIM), id, (caddr_t)fdq);
}

/*
 * This function fills in xfs_mount_t fields based on mount args.
 * Note: the superblock has _not_ yet been read in.
 */
STATIC int
xfs_start_flags(
        struct xfs_mount_args   *ap,
        struct xfs_mount        *mp)
{
        /* Values are in BBs */
        if ((ap->flags & XFSMNT_NOALIGN) != XFSMNT_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.
                 */
                mp->m_dalign = ap->sunit;
                mp->m_swidth = ap->swidth;
        }

        if (ap->logbufs != -1 &&
            ap->logbufs != 0 &&
            (ap->logbufs < XLOG_MIN_ICLOGS ||
             ap->logbufs > XLOG_MAX_ICLOGS)) {
                cmn_err(CE_WARN,
                        "XFS: invalid logbufs value: %d [not %d-%d]",
                        ap->logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
                return XFS_ERROR(EINVAL);
        }
        mp->m_logbufs = ap->logbufs;
        if (ap->logbufsize != -1 &&
            ap->logbufsize !=  0 &&
            (ap->logbufsize < XLOG_MIN_RECORD_BSIZE ||
             ap->logbufsize > XLOG_MAX_RECORD_BSIZE ||
             !is_power_of_2(ap->logbufsize))) {
                cmn_err(CE_WARN,
        "XFS: invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
                        ap->logbufsize);
                return XFS_ERROR(EINVAL);
        }
        mp->m_logbsize = ap->logbufsize;
        mp->m_fsname_len = strlen(ap->fsname) + 1;
        mp->m_fsname = kmem_alloc(mp->m_fsname_len, KM_SLEEP);
        strcpy(mp->m_fsname, ap->fsname);
        if (ap->rtname[0]) {
                mp->m_rtname = kmem_alloc(strlen(ap->rtname) + 1, KM_SLEEP);
                strcpy(mp->m_rtname, ap->rtname);
        }
        if (ap->logname[0]) {
                mp->m_logname = kmem_alloc(strlen(ap->logname) + 1, KM_SLEEP);
                strcpy(mp->m_logname, ap->logname);
        }

        if (ap->flags & XFSMNT_WSYNC)
                mp->m_flags |= XFS_MOUNT_WSYNC;
#if XFS_BIG_INUMS
        if (ap->flags & XFSMNT_INO64) {
                mp->m_flags |= XFS_MOUNT_INO64;
                mp->m_inoadd = XFS_INO64_OFFSET;
        }
#endif
        if (ap->flags & XFSMNT_RETERR)
                mp->m_flags |= XFS_MOUNT_RETERR;
        if (ap->flags & XFSMNT_NOALIGN)
                mp->m_flags |= XFS_MOUNT_NOALIGN;
        if (ap->flags & XFSMNT_SWALLOC)
                mp->m_flags |= XFS_MOUNT_SWALLOC;
        if (ap->flags & XFSMNT_OSYNCISOSYNC)
                mp->m_flags |= XFS_MOUNT_OSYNCISOSYNC;
        if (ap->flags & XFSMNT_32BITINODES)
                mp->m_flags |= XFS_MOUNT_32BITINODES;

        if (ap->flags & XFSMNT_IOSIZE) {
                if (ap->iosizelog > XFS_MAX_IO_LOG ||
                    ap->iosizelog < XFS_MIN_IO_LOG) {
                        cmn_err(CE_WARN,
                "XFS: invalid log iosize: %d [not %d-%d]",
                                ap->iosizelog, XFS_MIN_IO_LOG,
                                XFS_MAX_IO_LOG);
                        return XFS_ERROR(EINVAL);
                }

                mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
                mp->m_readio_log = mp->m_writeio_log = ap->iosizelog;
        }

        if (ap->flags & XFSMNT_IKEEP)
                mp->m_flags |= XFS_MOUNT_IKEEP;
        if (ap->flags & XFSMNT_DIRSYNC)
                mp->m_flags |= XFS_MOUNT_DIRSYNC;
        if (ap->flags & XFSMNT_ATTR2)
                mp->m_flags |= XFS_MOUNT_ATTR2;
        if (ap->flags & XFSMNT_NOATTR2)
                mp->m_flags |= XFS_MOUNT_NOATTR2;

        if (ap->flags2 & XFSMNT2_COMPAT_IOSIZE)
                mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;

        /*
         * no recovery flag requires a read-only mount
         */
        if (ap->flags & XFSMNT_NORECOVERY) {
                if (!(mp->m_flags & XFS_MOUNT_RDONLY)) {
                        cmn_err(CE_WARN,
        "XFS: tried to mount a FS read-write without recovery!");
                        return XFS_ERROR(EINVAL);
                }
                mp->m_flags |= XFS_MOUNT_NORECOVERY;
        }

        if (ap->flags & XFSMNT_NOUUID)
                mp->m_flags |= XFS_MOUNT_NOUUID;
        if (ap->flags & XFSMNT_BARRIER)
                mp->m_flags |= XFS_MOUNT_BARRIER;
        else
                mp->m_flags &= ~XFS_MOUNT_BARRIER;

        if (ap->flags2 & XFSMNT2_FILESTREAMS)
                mp->m_flags |= XFS_MOUNT_FILESTREAMS;

        if (ap->flags & XFSMNT_DMAPI)
                mp->m_flags |= XFS_MOUNT_DMAPI;
        return 0;
}

/*
 * This function fills in xfs_mount_t fields based on mount args.
 * Note: the superblock _has_ now been read in.
 */
STATIC int
xfs_finish_flags(
        struct xfs_mount_args   *ap,
        struct xfs_mount        *mp)
{
        int                     ronly = (mp->m_flags & XFS_MOUNT_RDONLY);

        /* Fail a mount where the logbuf is smaller then the log stripe */
        if (xfs_sb_version_haslogv2(&mp->m_sb)) {
                if ((ap->logbufsize <= 0) &&
                    (mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE)) {
                        mp->m_logbsize = mp->m_sb.sb_logsunit;
                } else if (ap->logbufsize > 0 &&
                           ap->logbufsize < mp->m_sb.sb_logsunit) {
                        cmn_err(CE_WARN,
        "XFS: 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 (ap->logbufsize > XLOG_BIG_RECORD_BSIZE) {
                        cmn_err(CE_WARN,
        "XFS: 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) &&
            !(ap->flags & XFSMNT_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) {
                cmn_err(CE_WARN,
        "XFS: cannot mount a read-only filesystem as read-write");
                return XFS_ERROR(EROFS);
        }

        /*
         * check for shared mount.
         */
        if (ap->flags & XFSMNT_SHARED) {
                if (!xfs_sb_version_hasshared(&mp->m_sb))
                        return XFS_ERROR(EINVAL);

                /*
                 * For IRIX 6.5, shared mounts must have the shared
                 * version bit set, have the persistent readonly
                 * field set, must be version 0 and can only be mounted
                 * read-only.
                 */
                if (!ronly || !(mp->m_sb.sb_flags & XFS_SBF_READONLY) ||
                     (mp->m_sb.sb_shared_vn != 0))
                        return XFS_ERROR(EINVAL);

                mp->m_flags |= XFS_MOUNT_SHARED;

                /*
                 * Shared XFS V0 can't deal with DMI.  Return EINVAL.
                 */
                if (mp->m_sb.sb_shared_vn == 0 && (ap->flags & XFSMNT_DMAPI))
                        return XFS_ERROR(EINVAL);
        }

        if (ap->flags & XFSMNT_UQUOTA) {
                mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
                if (ap->flags & XFSMNT_UQUOTAENF)
                        mp->m_qflags |= XFS_UQUOTA_ENFD;
        }

        if (ap->flags & XFSMNT_GQUOTA) {
                mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
                if (ap->flags & XFSMNT_GQUOTAENF)
                        mp->m_qflags |= XFS_OQUOTA_ENFD;
        } else if (ap->flags & XFSMNT_PQUOTA) {
                mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
                if (ap->flags & XFSMNT_PQUOTAENF)
                        mp->m_qflags |= XFS_OQUOTA_ENFD;
        }

        return 0;
}

STATIC int
xfs_fs_fill_super(
        struct super_block      *sb,
        void                    *data,
        int                     silent)
{
        struct inode            *root;
        struct xfs_mount        *mp = NULL;
        struct xfs_mount_args   *args = xfs_args_allocate(sb, silent);
        int                     flags = 0, error;

        mp = xfs_mount_init();

        INIT_LIST_HEAD(&mp->m_sync_list);
        spin_lock_init(&mp->m_sync_lock);
        init_waitqueue_head(&mp->m_wait_single_sync_task);

        mp->m_super = sb;
        sb->s_fs_info = mp;

        if (sb->s_flags & MS_RDONLY)
                mp->m_flags |= XFS_MOUNT_RDONLY;

        error = xfs_parseargs(mp, (char *)data, args, 0);
        if (error)
                goto fail_vfsop;

        sb_min_blocksize(sb, BBSIZE);
        sb->s_export_op = &xfs_export_operations;
        sb->s_qcop = &xfs_quotactl_operations;
        sb->s_op = &xfs_super_operations;

        error = xfs_dmops_get(mp, args);
        if (error)
                goto fail_vfsop;
        error = xfs_qmops_get(mp, args);
        if (error)
                goto out_put_dmops;

        if (args->flags & XFSMNT_QUIET)
                flags |= XFS_MFSI_QUIET;

        error = xfs_open_devices(mp, args);
        if (error)
                goto out_put_qmops;

        /*
         * Setup flags based on mount(2) options and then the superblock
         */
        error = xfs_start_flags(args, mp);
        if (error)
                goto error1;
        error = xfs_readsb(mp, flags);
        if (error)
                goto error1;
        error = xfs_finish_flags(args, mp);
        if (error)
                goto error2;

        /*
         * Setup xfs_mount buffer target pointers based on superblock
         */
        error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_blocksize,
                                    mp->m_sb.sb_sectsize);
        if (error)
                goto error2;
        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)
                        goto error2;
        }
        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)
                        goto error2;
        }

        if (mp->m_flags & XFS_MOUNT_BARRIER)
                xfs_mountfs_check_barriers(mp);

        error = xfs_filestream_mount(mp);
        if (error)
                goto error2;

        error = xfs_mountfs(mp, flags);
        if (error)
                goto error2;

        XFS_SEND_MOUNT(mp, DM_RIGHT_NULL, args->mtpt, args->fsname);

        sb->s_dirt = 1;
        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);

        root = igrab(mp->m_rootip->i_vnode);
        if (!root) {
                error = ENOENT;
                goto fail_unmount;
        }
        if (is_bad_inode(root)) {
                error = EINVAL;
                goto fail_vnrele;
        }
        sb->s_root = d_alloc_root(root);
        if (!sb->s_root) {
                error = ENOMEM;
                goto fail_vnrele;
        }

        mp->m_sync_work.w_syncer = xfs_sync_worker;
        mp->m_sync_work.w_mount = mp;
        mp->m_sync_task = kthread_run(xfssyncd, mp, "xfssyncd");
        if (IS_ERR(mp->m_sync_task)) {
                error = -PTR_ERR(mp->m_sync_task);
                goto fail_vnrele;
        }

        xfs_itrace_exit(XFS_I(sb->s_root->d_inode));

        kmem_free(args);
        return 0;

 error2:
        if (mp->m_sb_bp)
                xfs_freesb(mp);
 error1:
        xfs_binval(mp->m_ddev_targp);
        if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp)
                xfs_binval(mp->m_logdev_targp);
        if (mp->m_rtdev_targp)
                xfs_binval(mp->m_rtdev_targp);
        xfs_close_devices(mp);
 out_put_qmops:
        xfs_qmops_put(mp);
 out_put_dmops:
        xfs_dmops_put(mp);
        goto fail_vfsop;

 fail_vnrele:
        if (sb->s_root) {
                dput(sb->s_root);
                sb->s_root = NULL;
        } else {
                iput(root);
        }

 fail_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);
        error = xfs_unmount_flush(mp, 0);
        WARN_ON(error);

        IRELE(mp->m_rootip);

        xfs_unmountfs(mp);
        xfs_close_devices(mp);
        xfs_qmops_put(mp);
        xfs_dmops_put(mp);
        kmem_free(mp);

 fail_vfsop:
        kmem_free(args);
        return -error;
}

STATIC int
xfs_fs_get_sb(
        struct file_system_type *fs_type,
        int                     flags,
        const char              *dev_name,
        void                    *data,
        struct vfsmount         *mnt)
{
        return get_sb_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super,
                           mnt);
}

static struct super_operations xfs_super_operations = {
        .alloc_inode            = xfs_fs_alloc_inode,
        .destroy_inode          = xfs_fs_destroy_inode,
        .write_inode            = xfs_fs_write_inode,
        .clear_inode            = xfs_fs_clear_inode,
        .put_super              = xfs_fs_put_super,
        .write_super            = xfs_fs_write_super,
        .sync_fs                = xfs_fs_sync_super,
        .write_super_lockfs     = xfs_fs_lockfs,
        .statfs                 = xfs_fs_statfs,
        .remount_fs             = xfs_fs_remount,
        .show_options           = xfs_fs_show_options,
};

static struct quotactl_ops xfs_quotactl_operations = {
        .quota_sync             = xfs_fs_quotasync,
        .get_xstate             = xfs_fs_getxstate,
        .set_xstate             = xfs_fs_setxstate,
        .get_xquota             = xfs_fs_getxquota,
        .set_xquota             = xfs_fs_setxquota,
};

static struct file_system_type xfs_fs_type = {
        .owner                  = THIS_MODULE,
        .name                   = "xfs",
        .get_sb                 = xfs_fs_get_sb,
        .kill_sb                = kill_block_super,
        .fs_flags               = FS_REQUIRES_DEV,
};


STATIC int __init
init_xfs_fs( void )
{
        int                     error;
        static char             message[] __initdata = KERN_INFO \
                XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled\n";

        printk(message);

        ktrace_init(64);

        error = xfs_init_zones();
        if (error < 0)
                goto undo_zones;

        error = xfs_buf_init();
        if (error < 0)
                goto undo_buffers;

        vn_init();
        xfs_init();
        uuid_init();
        vfs_initquota();

        error = register_filesystem(&xfs_fs_type);
        if (error)
                goto undo_register;
        return 0;

undo_register:
        xfs_buf_terminate();

undo_buffers:
        xfs_destroy_zones();

undo_zones:
        return error;
}

STATIC void __exit
exit_xfs_fs( void )
{
        vfs_exitquota();
        unregister_filesystem(&xfs_fs_type);
        xfs_cleanup();
        xfs_buf_terminate();
        xfs_destroy_zones();
        ktrace_uninit();
}

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");