[safe/jmp/linux-2.6] / fs / xfs / xfs_vfsops.c

/*
 * Copyright (c) 2000-2005 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_fs.h"
#include "xfs_types.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_dmapi.h"
#include "xfs_mount.h"
#include "xfs_da_btree.h"
#include "xfs_bmap_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_dir2_sf.h"
#include "xfs_attr_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_inode_item.h"
#include "xfs_btree.h"
#include "xfs_alloc.h"
#include "xfs_ialloc.h"
#include "xfs_quota.h"
#include "xfs_error.h"
#include "xfs_bmap.h"
#include "xfs_rw.h"
#include "xfs_refcache.h"
#include "xfs_buf_item.h"
#include "xfs_log_priv.h"
#include "xfs_dir2_trace.h"
#include "xfs_extfree_item.h"
#include "xfs_acl.h"
#include "xfs_attr.h"
#include "xfs_clnt.h"
#include "xfs_mru_cache.h"
#include "xfs_filestream.h"
#include "xfs_fsops.h"

STATIC int      xfs_sync(bhv_desc_t *, int, cred_t *);

int
xfs_init(void)
{
        extern kmem_zone_t      *xfs_bmap_free_item_zone;
        extern kmem_zone_t      *xfs_btree_cur_zone;
        extern kmem_zone_t      *xfs_trans_zone;
        extern kmem_zone_t      *xfs_buf_item_zone;
        extern kmem_zone_t      *xfs_dabuf_zone;
#ifdef XFS_DABUF_DEBUG
        extern lock_t           xfs_dabuf_global_lock;
        spinlock_init(&xfs_dabuf_global_lock, "xfsda");
#endif

        /*
         * Initialize all of the zone allocators we use.
         */
        xfs_bmap_free_item_zone = kmem_zone_init(sizeof(xfs_bmap_free_item_t),
                                                 "xfs_bmap_free_item");
        xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
                                            "xfs_btree_cur");
        xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
        xfs_da_state_zone =
                kmem_zone_init(sizeof(xfs_da_state_t), "xfs_da_state");
        xfs_dabuf_zone = kmem_zone_init(sizeof(xfs_dabuf_t), "xfs_dabuf");
        xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
        xfs_acl_zone_init(xfs_acl_zone, "xfs_acl");
        xfs_mru_cache_init();
        xfs_filestream_init();

        /*
         * 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_BLI_CHUNK) /
                                  NBWORD) * sizeof(int))),
                               "xfs_buf_item");
        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");
        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");

        /*
         * These zones warrant special memory allocator hints
         */
        xfs_inode_zone =
                kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode",
                                        KM_ZONE_HWALIGN | KM_ZONE_RECLAIM |
                                        KM_ZONE_SPREAD, NULL);
        xfs_ili_zone =
                kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili",
                                        KM_ZONE_SPREAD, NULL);
        xfs_icluster_zone =
                kmem_zone_init_flags(sizeof(xfs_icluster_t), "xfs_icluster",
                                        KM_ZONE_SPREAD, NULL);

        /*
         * Allocate global trace buffers.
         */
#ifdef XFS_ALLOC_TRACE
        xfs_alloc_trace_buf = ktrace_alloc(XFS_ALLOC_TRACE_SIZE, KM_SLEEP);
#endif
#ifdef XFS_BMAP_TRACE
        xfs_bmap_trace_buf = ktrace_alloc(XFS_BMAP_TRACE_SIZE, KM_SLEEP);
#endif
#ifdef XFS_BMBT_TRACE
        xfs_bmbt_trace_buf = ktrace_alloc(XFS_BMBT_TRACE_SIZE, KM_SLEEP);
#endif
#ifdef XFS_ATTR_TRACE
        xfs_attr_trace_buf = ktrace_alloc(XFS_ATTR_TRACE_SIZE, KM_SLEEP);
#endif
#ifdef XFS_DIR2_TRACE
        xfs_dir2_trace_buf = ktrace_alloc(XFS_DIR2_GTRACE_SIZE, KM_SLEEP);
#endif

        xfs_dir_startup();

#if (defined(DEBUG) || defined(INDUCE_IO_ERROR))
        xfs_error_test_init();
#endif /* DEBUG || INDUCE_IO_ERROR */

        xfs_init_procfs();
        xfs_sysctl_register();
        return 0;
}

void
xfs_cleanup(void)
{
        extern kmem_zone_t      *xfs_bmap_free_item_zone;
        extern kmem_zone_t      *xfs_btree_cur_zone;
        extern kmem_zone_t      *xfs_inode_zone;
        extern kmem_zone_t      *xfs_trans_zone;
        extern kmem_zone_t      *xfs_da_state_zone;
        extern kmem_zone_t      *xfs_dabuf_zone;
        extern kmem_zone_t      *xfs_efd_zone;
        extern kmem_zone_t      *xfs_efi_zone;
        extern kmem_zone_t      *xfs_buf_item_zone;
        extern kmem_zone_t      *xfs_icluster_zone;

        xfs_cleanup_procfs();
        xfs_sysctl_unregister();
        xfs_refcache_destroy();
        xfs_filestream_uninit();
        xfs_mru_cache_uninit();
        xfs_acl_zone_destroy(xfs_acl_zone);

#ifdef XFS_DIR2_TRACE
        ktrace_free(xfs_dir2_trace_buf);
#endif
#ifdef XFS_ATTR_TRACE
        ktrace_free(xfs_attr_trace_buf);
#endif
#ifdef XFS_BMBT_TRACE
        ktrace_free(xfs_bmbt_trace_buf);
#endif
#ifdef XFS_BMAP_TRACE
        ktrace_free(xfs_bmap_trace_buf);
#endif
#ifdef XFS_ALLOC_TRACE
        ktrace_free(xfs_alloc_trace_buf);
#endif

        kmem_zone_destroy(xfs_bmap_free_item_zone);
        kmem_zone_destroy(xfs_btree_cur_zone);
        kmem_zone_destroy(xfs_inode_zone);
        kmem_zone_destroy(xfs_trans_zone);
        kmem_zone_destroy(xfs_da_state_zone);
        kmem_zone_destroy(xfs_dabuf_zone);
        kmem_zone_destroy(xfs_buf_item_zone);
        kmem_zone_destroy(xfs_efd_zone);
        kmem_zone_destroy(xfs_efi_zone);
        kmem_zone_destroy(xfs_ifork_zone);
        kmem_zone_destroy(xfs_ili_zone);
        kmem_zone_destroy(xfs_icluster_zone);
}

/*
 * xfs_start_flags
 *
 * 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 bhv_vfs          *vfs,
        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_IDELETE)
                mp->m_flags |= XFS_MOUNT_IDELETE;
        if (ap->flags & XFSMNT_DIRSYNC)
                mp->m_flags |= XFS_MOUNT_DIRSYNC;
        if (ap->flags & XFSMNT_ATTR2)
                mp->m_flags |= XFS_MOUNT_ATTR2;

        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 (!(vfs->vfs_flag & VFS_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;

        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 bhv_vfs          *vfs,
        struct xfs_mount_args   *ap,
        struct xfs_mount        *mp)
{
        int                     ronly = (vfs->vfs_flag & VFS_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);
                }
        }

        if (XFS_SB_VERSION_HASATTR2(&mp->m_sb)) {
                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);
        }

        return 0;
}

/*
 * xfs_mount
 *
 * 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 vfsp->vfs_super->s_bdev.
 */
STATIC int
xfs_mount(
        struct bhv_desc         *bhvp,
        struct xfs_mount_args   *args,
        cred_t                  *credp)
{
        struct bhv_vfs          *vfsp = bhvtovfs(bhvp);
        struct bhv_desc         *p;
        struct xfs_mount        *mp = XFS_BHVTOM(bhvp);
        struct block_device     *ddev, *logdev, *rtdev;
        int                     flags = 0, error;

        ddev = vfsp->vfs_super->s_bdev;
        logdev = rtdev = NULL;

        /*
         * Setup xfs_mount function vectors from available behaviors
         */
        p = vfs_bhv_lookup(vfsp, VFS_POSITION_DM);
        mp->m_dm_ops = p ? *(xfs_dmops_t *) vfs_bhv_custom(p) : xfs_dmcore_stub;
        p = vfs_bhv_lookup(vfsp, VFS_POSITION_QM);
        mp->m_qm_ops = p ? *(xfs_qmops_t *) vfs_bhv_custom(p) : xfs_qmcore_stub;
        p = vfs_bhv_lookup(vfsp, VFS_POSITION_IO);
        mp->m_io_ops = p ? *(xfs_ioops_t *) vfs_bhv_custom(p) : xfs_iocore_xfs;

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

        /*
         * Open real time and log devices - order is important.
         */
        if (args->logname[0]) {
                error = xfs_blkdev_get(mp, args->logname, &logdev);
                if (error)
                        return error;
        }
        if (args->rtname[0]) {
                error = xfs_blkdev_get(mp, args->rtname, &rtdev);
                if (error) {
                        xfs_blkdev_put(logdev);
                        return error;
                }

                if (rtdev == ddev || rtdev == logdev) {
                        cmn_err(CE_WARN,
        "XFS: Cannot mount filesystem with identical rtdev and ddev/logdev.");
                        xfs_blkdev_put(logdev);
                        xfs_blkdev_put(rtdev);
                        return EINVAL;
                }
        }

        /*
         * Setup xfs_mount buffer target pointers
         */
        error = ENOMEM;
        mp->m_ddev_targp = xfs_alloc_buftarg(ddev, 0);
        if (!mp->m_ddev_targp) {
                xfs_blkdev_put(logdev);
                xfs_blkdev_put(rtdev);
                return error;
        }
        if (rtdev) {
                mp->m_rtdev_targp = xfs_alloc_buftarg(rtdev, 1);
                if (!mp->m_rtdev_targp) {
                        xfs_blkdev_put(logdev);
                        xfs_blkdev_put(rtdev);
                        goto error0;
                }
        }
        mp->m_logdev_targp = (logdev && logdev != ddev) ?
                                xfs_alloc_buftarg(logdev, 1) : mp->m_ddev_targp;
        if (!mp->m_logdev_targp) {
                xfs_blkdev_put(logdev);
                xfs_blkdev_put(rtdev);
                goto error0;
        }

        /*
         * Setup flags based on mount(2) options and then the superblock
         */
        error = xfs_start_flags(vfsp, args, mp);
        if (error)
                goto error1;
        error = xfs_readsb(mp, flags);
        if (error)
                goto error1;
        error = xfs_finish_flags(vfsp, 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 && logdev && logdev != ddev) {
                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 && rtdev)
                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);

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

        error = XFS_IOINIT(vfsp, args, flags);
        if (error)
                goto error2;

        return 0;

error2:
        if (mp->m_sb_bp)
                xfs_freesb(mp);
error1:
        xfs_binval(mp->m_ddev_targp);
        if (logdev && logdev != ddev)
                xfs_binval(mp->m_logdev_targp);
        if (rtdev)
                xfs_binval(mp->m_rtdev_targp);
error0:
        xfs_unmountfs_close(mp, credp);
        return error;
}

STATIC int
xfs_unmount(
        bhv_desc_t      *bdp,
        int             flags,
        cred_t          *credp)
{
        bhv_vfs_t       *vfsp = bhvtovfs(bdp);
        xfs_mount_t     *mp = XFS_BHVTOM(bdp);
        xfs_inode_t     *rip;
        bhv_vnode_t     *rvp;
        int             unmount_event_wanted = 0;
        int             unmount_event_flags = 0;
        int             xfs_unmountfs_needed = 0;
        int             error;

        rip = mp->m_rootip;
        rvp = XFS_ITOV(rip);

#ifdef HAVE_DMAPI
        if (vfsp->vfs_flag & VFS_DMI) {
                error = XFS_SEND_PREUNMOUNT(mp, vfsp,
                                rvp, DM_RIGHT_NULL, rvp, DM_RIGHT_NULL,
                                NULL, NULL, 0, 0,
                                (mp->m_dmevmask & (1<<DM_EVENT_PREUNMOUNT))?
                                        0:DM_FLAGS_UNWANTED);
                        if (error)
                                return XFS_ERROR(error);
                unmount_event_wanted = 1;
                unmount_event_flags = (mp->m_dmevmask & (1<<DM_EVENT_UNMOUNT))?
                                        0 : DM_FLAGS_UNWANTED;
        }
#endif
        /*
         * First blow any referenced inode from this file system
         * out of the reference cache, and delete the timer.
         */
        xfs_refcache_purge_mp(mp);

        /*
         * Blow away any referenced inode in the filestreams cache.
         * This can and will cause log traffic as inodes go inactive
         * here.
         */
        xfs_filestream_unmount(mp);

        XFS_bflush(mp->m_ddev_targp);
        error = xfs_unmount_flush(mp, 0);
        if (error)
                goto out;

        ASSERT(vn_count(rvp) == 1);

        /*
         * Drop the reference count
         */
        VN_RELE(rvp);

        /*
         * 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->m_bhv,
                         (SYNC_WAIT | SYNC_CLOSE), credp);
                ASSERT(error != EFSCORRUPTED);
        }
        xfs_unmountfs_needed = 1;

out:
        /*      Send DMAPI event, if required.
         *      Then do xfs_unmountfs() if needed.
         *      Then return error (or zero).
         */
        if (unmount_event_wanted) {
                /* Note: mp structure must still exist for
                 * XFS_SEND_UNMOUNT() call.
                 */
                XFS_SEND_UNMOUNT(mp, vfsp, error == 0 ? rvp : NULL,
                        DM_RIGHT_NULL, 0, error, unmount_event_flags);
        }
        if (xfs_unmountfs_needed) {
                /*
                 * Call common unmount function to flush to disk
                 * and free the super block buffer & mount structures.
                 */
                xfs_unmountfs(mp, credp);
        }

        return XFS_ERROR(error);
}

STATIC int
xfs_quiesce_fs(
        xfs_mount_t             *mp)
{
        int                     count = 0, pincount;

        xfs_refcache_purge_mp(mp);
        xfs_flush_buftarg(mp->m_ddev_targp, 0);
        xfs_finish_reclaim_all(mp, 0);

        /* This loop must run at least twice.
         * The first instance of the loop will flush
         * most meta data but that will generate more
         * meta data (typically directory updates).
         * Which then must be flushed and logged before
         * we can write the unmount record.
         */
        do {
                xfs_syncsub(mp, SYNC_INODE_QUIESCE, NULL);
                pincount = xfs_flush_buftarg(mp->m_ddev_targp, 1);
                if (!pincount) {
                        delay(50);
                        count++;
                }
        } while (count < 2);

        return 0;
}

/*
 * Second stage of a quiesce. The data is already synced, now we have to take
 * care of the metadata. New transactions are already blocked, so we need to
 * wait for any remaining transactions to drain out before proceding.
 */
STATIC void
xfs_attr_quiesce(
        xfs_mount_t     *mp)
{
        /* wait for all modifications to complete */
        while (atomic_read(&mp->m_active_trans) > 0)
                delay(100);

        /* flush inodes and push all remaining buffers out to disk */
        xfs_quiesce_fs(mp);

        ASSERT_ALWAYS(atomic_read(&mp->m_active_trans) == 0);

        /* Push the superblock and write an unmount record */
        xfs_log_sbcount(mp, 1);
        xfs_log_unmount_write(mp);
        xfs_unmountfs_writesb(mp);
}

STATIC int
xfs_mntupdate(
        bhv_desc_t                      *bdp,
        int                             *flags,
        struct xfs_mount_args           *args)
{
        bhv_vfs_t       *vfsp = bhvtovfs(bdp);
        xfs_mount_t     *mp = XFS_BHVTOM(bdp);

        if (!(*flags & MS_RDONLY)) {                    /* rw/ro -> rw */
                if (vfsp->vfs_flag & VFS_RDONLY)
                        vfsp->vfs_flag &= ~VFS_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 (!(vfsp->vfs_flag & VFS_RDONLY)) {    /* rw -> ro */
                xfs_filestream_flush(mp);
                bhv_vfs_sync(vfsp, SYNC_DATA_QUIESCE, NULL);
                xfs_attr_quiesce(mp);
                vfsp->vfs_flag |= VFS_RDONLY;
        }
        return 0;
}

/*
 * xfs_unmount_flush implements a set of flush operation on special
 * inodes, which are needed as a separate set of operations so that
 * they can be called as part of relocation process.
 */
int
xfs_unmount_flush(
        xfs_mount_t     *mp,            /* Mount structure we are getting
                                           rid of. */
        int             relocation)     /* Called from vfs relocation. */
{
        xfs_inode_t     *rip = mp->m_rootip;
        xfs_inode_t     *rbmip;
        xfs_inode_t     *rsumip = NULL;
        bhv_vnode_t     *rvp = XFS_ITOV(rip);
        int             error;

        xfs_ilock(rip, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
        xfs_iflock(rip);

        /*
         * Flush out the real time inodes.
         */
        if ((rbmip = mp->m_rbmip) != NULL) {
                xfs_ilock(rbmip, XFS_ILOCK_EXCL);
                xfs_iflock(rbmip);
                error = xfs_iflush(rbmip, XFS_IFLUSH_SYNC);
                xfs_iunlock(rbmip, XFS_ILOCK_EXCL);

                if (error == EFSCORRUPTED)
                        goto fscorrupt_out;

                ASSERT(vn_count(XFS_ITOV(rbmip)) == 1);

                rsumip = mp->m_rsumip;
                xfs_ilock(rsumip, XFS_ILOCK_EXCL);
                xfs_iflock(rsumip);
                error = xfs_iflush(rsumip, XFS_IFLUSH_SYNC);
                xfs_iunlock(rsumip, XFS_ILOCK_EXCL);

                if (error == EFSCORRUPTED)
                        goto fscorrupt_out;

                ASSERT(vn_count(XFS_ITOV(rsumip)) == 1);
        }

        /*
         * Synchronously flush root inode to disk
         */
        error = xfs_iflush(rip, XFS_IFLUSH_SYNC);
        if (error == EFSCORRUPTED)
                goto fscorrupt_out2;

        if (vn_count(rvp) != 1 && !relocation) {
                xfs_iunlock(rip, XFS_ILOCK_EXCL);
                return XFS_ERROR(EBUSY);
        }

        /*
         * Release dquot that rootinode, rbmino and rsumino might be holding,
         * flush and purge the quota inodes.
         */
        error = XFS_QM_UNMOUNT(mp);
        if (error == EFSCORRUPTED)
                goto fscorrupt_out2;

        if (rbmip) {
                VN_RELE(XFS_ITOV(rbmip));
                VN_RELE(XFS_ITOV(rsumip));
        }

        xfs_iunlock(rip, XFS_ILOCK_EXCL);
        return 0;

fscorrupt_out:
        xfs_ifunlock(rip);

fscorrupt_out2:
        xfs_iunlock(rip, XFS_ILOCK_EXCL);

        return XFS_ERROR(EFSCORRUPTED);
}

/*
 * xfs_root extracts the root vnode from a vfs.
 *
 * vfsp -- the vfs struct for the desired file system
 * vpp  -- address of the caller's vnode pointer which should be
 *         set to the desired fs root vnode
 */
STATIC int
xfs_root(
        bhv_desc_t      *bdp,
        bhv_vnode_t     **vpp)
{
        bhv_vnode_t     *vp;

        vp = XFS_ITOV((XFS_BHVTOM(bdp))->m_rootip);
        VN_HOLD(vp);
        *vpp = vp;
        return 0;
}

/*
 * xfs_statvfs
 *
 * Fill in the statvfs structure for the given file system.  We use
 * the superblock lock in the mount structure to ensure a consistent
 * snapshot of the counters returned.
 */
STATIC int
xfs_statvfs(
        bhv_desc_t      *bdp,
        bhv_statvfs_t   *statp,
        bhv_vnode_t     *vp)
{
        __uint64_t      fakeinos;
        xfs_extlen_t    lsize;
        xfs_mount_t     *mp;
        xfs_sb_t        *sbp;
        unsigned long   s;

        mp = XFS_BHVTOM(bdp);
        sbp = &(mp->m_sb);

        statp->f_type = XFS_SB_MAGIC;

        xfs_icsb_sync_counters_flags(mp, XFS_ICSB_LAZY_COUNT);
        s = XFS_SB_LOCK(mp);
        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);
        XFS_SB_UNLOCK(mp, s);

        xfs_statvfs_fsid(statp, mp);
        statp->f_namelen = MAXNAMELEN - 1;

        return 0;
}


/*
 * xfs_sync flushes any pending I/O to file system vfsp.
 *
 * This routine is called by vfs_sync() to make sure that things make it
 * out to disk eventually, on sync() system calls to flush out everything,
 * and when the file system is unmounted.  For the vfs_sync() case, all
 * we really need to do is sync out the log to make all of our meta-data
 * updates permanent (except for timestamps).  For calls from pflushd(),
 * dirty pages are kept moving by calling pdflush() on the inodes
 * containing them.  We also flush the inodes that we can lock without
 * sleeping and the superblock if we can lock it without sleeping from
 * vfs_sync() so that items at the tail of the log are always moving out.
 *
 * Flags:
 *      SYNC_BDFLUSH - We're being called from vfs_sync() so we don't want
 *                     to sleep if we can help it.  All we really need
 *                     to do is ensure that the log is synced at least
 *                     periodically.  We also push the inodes and
 *                     superblock if we can lock them without sleeping
 *                      and they are not pinned.
 *      SYNC_ATTR    - We need to flush the inodes.  If SYNC_BDFLUSH is not
 *                     set, then we really want to lock each inode and flush
 *                     it.
 *      SYNC_WAIT    - All the flushes that take place in this call should
 *                     be synchronous.
 *      SYNC_DELWRI  - This tells us to push dirty pages associated with
 *                     inodes.  SYNC_WAIT and SYNC_BDFLUSH are used to
 *                     determine if they should be flushed sync, async, or
 *                     delwri.
 *      SYNC_CLOSE   - This flag is passed when the system is being
 *                     unmounted.  We should sync and invalidate everything.
 *      SYNC_FSDATA  - This indicates that the caller would like to make
 *                     sure the superblock is safe on disk.  We can ensure
 *                     this by simply making sure the log gets flushed
 *                     if SYNC_BDFLUSH is set, and by actually writing it
 *                     out otherwise.
 *      SYNC_IOWAIT  - The caller wants us to wait for all data I/O to complete
 *                     before we return (including direct I/O). Forms the drain
 *                     side of the write barrier needed to safely quiesce the
 *                     filesystem.
 *
 */
/*ARGSUSED*/
STATIC int
xfs_sync(
        bhv_desc_t      *bdp,
        int             flags,
        cred_t          *credp)
{
        xfs_mount_t     *mp = XFS_BHVTOM(bdp);

        if (flags & SYNC_IOWAIT)
                xfs_filestream_flush(mp);

        return xfs_syncsub(mp, flags, NULL);
}

/*
 * xfs sync routine for internal use
 *
 * This routine supports all of the flags defined for the generic vfs_sync
 * interface as explained above under xfs_sync.
 *
 */
int
xfs_sync_inodes(
        xfs_mount_t     *mp,
        int             flags,
        int             *bypassed)
{
        xfs_inode_t     *ip = NULL;
        xfs_inode_t     *ip_next;
        xfs_buf_t       *bp;
        bhv_vnode_t     *vp = NULL;
        int             error;
        int             last_error;
        uint64_t        fflag;
        uint            lock_flags;
        uint            base_lock_flags;
        boolean_t       mount_locked;
        boolean_t       vnode_refed;
        int             preempt;
        xfs_dinode_t    *dip;
        xfs_iptr_t      *ipointer;
#ifdef DEBUG
        boolean_t       ipointer_in = B_FALSE;

#define IPOINTER_SET    ipointer_in = B_TRUE
#define IPOINTER_CLR    ipointer_in = B_FALSE
#else
#define IPOINTER_SET
#define IPOINTER_CLR
#endif


/* Insert a marker record into the inode list after inode ip. The list
 * must be locked when this is called. After the call the list will no
 * longer be locked.
 */
#define IPOINTER_INSERT(ip, mp) { \
                ASSERT(ipointer_in == B_FALSE); \
                ipointer->ip_mnext = ip->i_mnext; \
                ipointer->ip_mprev = ip; \
                ip->i_mnext = (xfs_inode_t *)ipointer; \
                ipointer->ip_mnext->i_mprev = (xfs_inode_t *)ipointer; \
                preempt = 0; \
                XFS_MOUNT_IUNLOCK(mp); \
                mount_locked = B_FALSE; \
                IPOINTER_SET; \
        }

/* Remove the marker from the inode list. If the marker was the only item
 * in the list then there are no remaining inodes and we should zero out
 * the whole list. If we are the current head of the list then move the head
 * past us.
 */
#define IPOINTER_REMOVE(ip, mp) { \
                ASSERT(ipointer_in == B_TRUE); \
                if (ipointer->ip_mnext != (xfs_inode_t *)ipointer) { \
                        ip = ipointer->ip_mnext; \
                        ip->i_mprev = ipointer->ip_mprev; \
                        ipointer->ip_mprev->i_mnext = ip; \
                        if (mp->m_inodes == (xfs_inode_t *)ipointer) { \
                                mp->m_inodes = ip; \
                        } \
                } else { \
                        ASSERT(mp->m_inodes == (xfs_inode_t *)ipointer); \
                        mp->m_inodes = NULL; \
                        ip = NULL; \
                } \
                IPOINTER_CLR; \
        }

#define XFS_PREEMPT_MASK        0x7f

        if (bypassed)
                *bypassed = 0;
        if (XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY)
                return 0;
        error = 0;
        last_error = 0;
        preempt = 0;

        /* Allocate a reference marker */
        ipointer = (xfs_iptr_t *)kmem_zalloc(sizeof(xfs_iptr_t), KM_SLEEP);

        fflag = XFS_B_ASYNC;            /* default is don't wait */
        if (flags & (SYNC_BDFLUSH | SYNC_DELWRI))
                fflag = XFS_B_DELWRI;
        if (flags & SYNC_WAIT)
                fflag = 0;              /* synchronous overrides all */

        base_lock_flags = XFS_ILOCK_SHARED;
        if (flags & (SYNC_DELWRI | SYNC_CLOSE)) {
                /*
                 * We need the I/O lock if we're going to call any of
                 * the flush/inval routines.
                 */
                base_lock_flags |= XFS_IOLOCK_SHARED;
        }

        XFS_MOUNT_ILOCK(mp);

        ip = mp->m_inodes;

        mount_locked = B_TRUE;
        vnode_refed  = B_FALSE;

        IPOINTER_CLR;

        do {
                ASSERT(ipointer_in == B_FALSE);
                ASSERT(vnode_refed == B_FALSE);

                lock_flags = base_lock_flags;

                /*
                 * There were no inodes in the list, just break out
                 * of the loop.
                 */
                if (ip == NULL) {
                        break;
                }

                /*
                 * We found another sync thread marker - skip it
                 */
                if (ip->i_mount == NULL) {
                        ip = ip->i_mnext;
                        continue;
                }

                vp = XFS_ITOV_NULL(ip);

                /*
                 * If the vnode is gone then this is being torn down,
                 * call reclaim if it is flushed, else let regular flush
                 * code deal with it later in the loop.
                 */

                if (vp == NULL) {
                        /* Skip ones already in reclaim */
                        if (ip->i_flags & XFS_IRECLAIM) {
                                ip = ip->i_mnext;
                                continue;
                        }
                        if (xfs_ilock_nowait(ip, XFS_ILOCK_EXCL) == 0) {
                                ip = ip->i_mnext;
                        } else if ((xfs_ipincount(ip) == 0) &&
                                    xfs_iflock_nowait(ip)) {
                                IPOINTER_INSERT(ip, mp);

                                xfs_finish_reclaim(ip, 1,
                                                XFS_IFLUSH_DELWRI_ELSE_ASYNC);

                                XFS_MOUNT_ILOCK(mp);
                                mount_locked = B_TRUE;
                                IPOINTER_REMOVE(ip, mp);
                        } else {
                                xfs_iunlock(ip, XFS_ILOCK_EXCL);
                                ip = ip->i_mnext;
                        }
                        continue;
                }

                if (VN_BAD(vp)) {
                        ip = ip->i_mnext;
                        continue;
                }

                if (XFS_FORCED_SHUTDOWN(mp) && !(flags & SYNC_CLOSE)) {
                        XFS_MOUNT_IUNLOCK(mp);
                        kmem_free(ipointer, sizeof(xfs_iptr_t));
                        return 0;
                }

                /*
                 * If this is just vfs_sync() or pflushd() calling
                 * then we can skip inodes for which it looks like
                 * there is nothing to do.  Since we don't have the
                 * inode locked this is racy, but these are periodic
                 * calls so it doesn't matter.  For the others we want
                 * to know for sure, so we at least try to lock them.
                 */
                if (flags & SYNC_BDFLUSH) {
                        if (((ip->i_itemp == NULL) ||
                             !(ip->i_itemp->ili_format.ilf_fields &
                               XFS_ILOG_ALL)) &&
                            (ip->i_update_core == 0)) {
                                ip = ip->i_mnext;
                                continue;
                        }
                }

                /*
                 * Try to lock without sleeping.  We're out of order with
                 * the inode list lock here, so if we fail we need to drop
                 * the mount lock and try again.  If we're called from
                 * bdflush() here, then don't bother.
                 *
                 * The inode lock here actually coordinates with the
                 * almost spurious inode lock in xfs_ireclaim() to prevent
                 * the vnode we handle here without a reference from
                 * being freed while we reference it.  If we lock the inode
                 * while it's on the mount list here, then the spurious inode
                 * lock in xfs_ireclaim() after the inode is pulled from
                 * the mount list will sleep until we release it here.
                 * This keeps the vnode from being freed while we reference
                 * it.
                 */
                if (xfs_ilock_nowait(ip, lock_flags) == 0) {
                        if ((flags & SYNC_BDFLUSH) || (vp == NULL)) {
                                ip = ip->i_mnext;
                                continue;
                        }

                        vp = vn_grab(vp);
                        if (vp == NULL) {
                                ip = ip->i_mnext;
                                continue;
                        }

                        IPOINTER_INSERT(ip, mp);
                        xfs_ilock(ip, lock_flags);

                        ASSERT(vp == XFS_ITOV(ip));
                        ASSERT(ip->i_mount == mp);

                        vnode_refed = B_TRUE;
                }

                /* From here on in the loop we may have a marker record
                 * in the inode list.
                 */

                /*
                 * If we have to flush data or wait for I/O completion
                 * we need to drop the ilock that we currently hold.
                 * If we need to drop the lock, insert a marker if we
                 * have not already done so.
                 */
                if ((flags & (SYNC_CLOSE|SYNC_IOWAIT)) ||
                    ((flags & SYNC_DELWRI) && VN_DIRTY(vp))) {
                        if (mount_locked) {
                                IPOINTER_INSERT(ip, mp);
                        }
                        xfs_iunlock(ip, XFS_ILOCK_SHARED);

                        if (flags & SYNC_CLOSE) {
                                /* Shutdown case. Flush and invalidate. */
                                if (XFS_FORCED_SHUTDOWN(mp))
                                        bhv_vop_toss_pages(vp, 0, -1, FI_REMAPF);
                                else
                                        error = bhv_vop_flushinval_pages(vp, 0,
                                                                -1, FI_REMAPF);
                        } else if ((flags & SYNC_DELWRI) && VN_DIRTY(vp)) {
                                error = bhv_vop_flush_pages(vp, (xfs_off_t)0,
                                                        -1, fflag, FI_NONE);
                        }

                        /*
                         * When freezing, we need to wait ensure all I/O (including direct
                         * I/O) is complete to ensure no further data modification can take
                         * place after this point
                         */
                        if (flags & SYNC_IOWAIT)
                                vn_iowait(vp);

                        xfs_ilock(ip, XFS_ILOCK_SHARED);
                }

                if (flags & SYNC_BDFLUSH) {
                        if ((flags & SYNC_ATTR) &&
                            ((ip->i_update_core) ||
                             ((ip->i_itemp != NULL) &&
                              (ip->i_itemp->ili_format.ilf_fields != 0)))) {

                                /* Insert marker and drop lock if not already
                                 * done.
                                 */
                                if (mount_locked) {
                                        IPOINTER_INSERT(ip, mp);
                                }

                                /*
                                 * We don't want the periodic flushing of the
                                 * inodes by vfs_sync() to interfere with
                                 * I/O to the file, especially read I/O
                                 * where it is only the access time stamp
                                 * that is being flushed out.  To prevent
                                 * long periods where we have both inode
                                 * locks held shared here while reading the
                                 * inode's buffer in from disk, we drop the
                                 * inode lock while reading in the inode
                                 * buffer.  We have to release the buffer
                                 * and reacquire the inode lock so that they
                                 * are acquired in the proper order (inode
                                 * locks first).  The buffer will go at the
                                 * end of the lru chain, though, so we can
                                 * expect it to still be there when we go
                                 * for it again in xfs_iflush().
                                 */
                                if ((xfs_ipincount(ip) == 0) &&
                                    xfs_iflock_nowait(ip)) {

                                        xfs_ifunlock(ip);
                                        xfs_iunlock(ip, XFS_ILOCK_SHARED);

                                        error = xfs_itobp(mp, NULL, ip,
                                                          &dip, &bp, 0, 0);
                                        if (!error) {
                                                xfs_buf_relse(bp);
                                        } else {
                                                /* Bailing out, remove the
                                                 * marker and free it.
                                                 */
                                                XFS_MOUNT_ILOCK(mp);
                                                IPOINTER_REMOVE(ip, mp);
                                                XFS_MOUNT_IUNLOCK(mp);

                                                ASSERT(!(lock_flags &
                                                        XFS_IOLOCK_SHARED));

                                                kmem_free(ipointer,
                                                        sizeof(xfs_iptr_t));
                                                return (0);
                                        }

                                        /*
                                         * Since we dropped the inode lock,
                                         * the inode may have been reclaimed.
                                         * Therefore, we reacquire the mount
                                         * lock and check to see if we were the
                                         * inode reclaimed. If this happened
                                         * then the ipointer marker will no
                                         * longer point back at us. In this
                                         * case, move ip along to the inode
                                         * after the marker, remove the marker
                                         * and continue.
                                         */
                                        XFS_MOUNT_ILOCK(mp);
                                        mount_locked = B_TRUE;

                                        if (ip != ipointer->ip_mprev) {
                                                IPOINTER_REMOVE(ip, mp);

                                                ASSERT(!vnode_refed);
                                                ASSERT(!(lock_flags &
                                                        XFS_IOLOCK_SHARED));
                                                continue;
                                        }

                                        ASSERT(ip->i_mount == mp);

                                        if (xfs_ilock_nowait(ip,
                                                    XFS_ILOCK_SHARED) == 0) {
                                                ASSERT(ip->i_mount == mp);
                                                /*
                                                 * We failed to reacquire
                                                 * the inode lock without
                                                 * sleeping, so just skip
                                                 * the inode for now.  We
                                                 * clear the ILOCK bit from
                                                 * the lock_flags so that we
                                                 * won't try to drop a lock
                                                 * we don't hold below.
                                                 */
                                                lock_flags &= ~XFS_ILOCK_SHARED;
                                                IPOINTER_REMOVE(ip_next, mp);
                                        } else if ((xfs_ipincount(ip) == 0) &&
                                                   xfs_iflock_nowait(ip)) {
                                                ASSERT(ip->i_mount == mp);
                                                /*
                                                 * Since this is vfs_sync()
                                                 * calling we only flush the
                                                 * inode out if we can lock
                                                 * it without sleeping and
                                                 * it is not pinned.  Drop
                                                 * the mount lock here so
                                                 * that we don't hold it for
                                                 * too long. We already have
                                                 * a marker in the list here.
                                                 */
                                                XFS_MOUNT_IUNLOCK(mp);
                                                mount_locked = B_FALSE;
                                                error = xfs_iflush(ip,
                                                           XFS_IFLUSH_DELWRI);
                                        } else {
                                                ASSERT(ip->i_mount == mp);
                                                IPOINTER_REMOVE(ip_next, mp);
                                        }
                                }

                        }

                } else {
                        if ((flags & SYNC_ATTR) &&
                            ((ip->i_update_core) ||
                             ((ip->i_itemp != NULL) &&
                              (ip->i_itemp->ili_format.ilf_fields != 0)))) {
                                if (mount_locked) {
                                        IPOINTER_INSERT(ip, mp);
                                }

                                if (flags & SYNC_WAIT) {
                                        xfs_iflock(ip);
                                        error = xfs_iflush(ip,
                                                           XFS_IFLUSH_SYNC);
                                } else {
                                        /*
                                         * If we can't acquire the flush
                                         * lock, then the inode is already
                                         * being flushed so don't bother
                                         * waiting.  If we can lock it then
                                         * do a delwri flush so we can
                                         * combine multiple inode flushes
                                         * in each disk write.
                                         */
                                        if (xfs_iflock_nowait(ip)) {
                                                error = xfs_iflush(ip,
                                                           XFS_IFLUSH_DELWRI);
                                        }
                                        else if (bypassed)
                                                (*bypassed)++;
                                }
                        }
                }

                if (lock_flags != 0) {
                        xfs_iunlock(ip, lock_flags);
                }

                if (vnode_refed) {
                        /*
                         * If we had to take a reference on the vnode
                         * above, then wait until after we've unlocked
                         * the inode to release the reference.  This is
                         * because we can be already holding the inode
                         * lock when VN_RELE() calls xfs_inactive().
                         *
                         * Make sure to drop the mount lock before calling
                         * VN_RELE() so that we don't trip over ourselves if
                         * we have to go for the mount lock again in the
                         * inactive code.
                         */
                        if (mount_locked) {
                                IPOINTER_INSERT(ip, mp);
                        }

                        VN_RELE(vp);

                        vnode_refed = B_FALSE;
                }

                if (error) {
                        last_error = error;
                }

                /*
                 * bail out if the filesystem is corrupted.
                 */
                if (error == EFSCORRUPTED)  {
                        if (!mount_locked) {
                                XFS_MOUNT_ILOCK(mp);
                                IPOINTER_REMOVE(ip, mp);
                        }
                        XFS_MOUNT_IUNLOCK(mp);
                        ASSERT(ipointer_in == B_FALSE);
                        kmem_free(ipointer, sizeof(xfs_iptr_t));
                        return XFS_ERROR(error);
                }

                /* Let other threads have a chance at the mount lock
                 * if we have looped many times without dropping the
                 * lock.
                 */
                if ((++preempt & XFS_PREEMPT_MASK) == 0) {
                        if (mount_locked) {
                                IPOINTER_INSERT(ip, mp);
                        }
                }

                if (mount_locked == B_FALSE) {
                        XFS_MOUNT_ILOCK(mp);
                        mount_locked = B_TRUE;
                        IPOINTER_REMOVE(ip, mp);
                        continue;
                }

                ASSERT(ipointer_in == B_FALSE);
                ip = ip->i_mnext;

        } while (ip != mp->m_inodes);

        XFS_MOUNT_IUNLOCK(mp);

        ASSERT(ipointer_in == B_FALSE);

        kmem_free(ipointer, sizeof(xfs_iptr_t));
        return XFS_ERROR(last_error);
}

/*
 * xfs sync routine for internal use
 *
 * This routine supports all of the flags defined for the generic vfs_sync
 * interface as explained above under xfs_sync.
 *
 */
int
xfs_syncsub(
        xfs_mount_t     *mp,
        int             flags,
        int             *bypassed)
{
        int             error = 0;
        int             last_error = 0;
        uint            log_flags = XFS_LOG_FORCE;
        xfs_buf_t       *bp;
        xfs_buf_log_item_t      *bip;

        /*
         * Sync out the log.  This ensures that the log is periodically
         * flushed even if there is not enough activity to fill it up.
         */
        if (flags & SYNC_WAIT)
                log_flags |= XFS_LOG_SYNC;

        xfs_log_force(mp, (xfs_lsn_t)0, log_flags);

        if (flags & (SYNC_ATTR|SYNC_DELWRI)) {
                if (flags & SYNC_BDFLUSH)
                        xfs_finish_reclaim_all(mp, 1);
                else
                        error = xfs_sync_inodes(mp, flags, bypassed);
        }

        /*
         * Flushing out dirty data above probably generated more
         * log activity, so if this isn't vfs_sync() then flush
         * the log again.
         */
        if (flags & SYNC_DELWRI) {
                xfs_log_force(mp, (xfs_lsn_t)0, log_flags);
        }

        if (flags & SYNC_FSDATA) {
                /*
                 * If this is vfs_sync() then only sync the superblock
                 * if we can lock it without sleeping and it is not pinned.
                 */
                if (flags & SYNC_BDFLUSH) {
                        bp = xfs_getsb(mp, XFS_BUF_TRYLOCK);
                        if (bp != NULL) {
                                bip = XFS_BUF_FSPRIVATE(bp,xfs_buf_log_item_t*);
                                if ((bip != NULL) &&
                                    xfs_buf_item_dirty(bip)) {
                                        if (!(XFS_BUF_ISPINNED(bp))) {
                                                XFS_BUF_ASYNC(bp);
                                                error = xfs_bwrite(mp, bp);
                                        } else {
                                                xfs_buf_relse(bp);
                                        }
                                } else {
                                        xfs_buf_relse(bp);
                                }
                        }
                } else {
                        bp = xfs_getsb(mp, 0);
                        /*
                         * If the buffer is pinned then push on the log so
                         * we won't get stuck waiting in the write for
                         * someone, maybe ourselves, to flush the log.
                         * Even though we just pushed the log above, we
                         * did not have the superblock buffer locked at
                         * that point so it can become pinned in between
                         * there and here.
                         */
                        if (XFS_BUF_ISPINNED(bp))
                                xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE);
                        if (flags & SYNC_WAIT)
                                XFS_BUF_UNASYNC(bp);
                        else
                                XFS_BUF_ASYNC(bp);
                        error = xfs_bwrite(mp, bp);
                }
                if (error) {
                        last_error = error;
                }
        }

        /*
         * If this is the periodic sync, then kick some entries out of
         * the reference cache.  This ensures that idle entries are
         * eventually kicked out of the cache.
         */
        if (flags & SYNC_REFCACHE) {
                if (flags & SYNC_WAIT)
                        xfs_refcache_purge_mp(mp);
                else
                        xfs_refcache_purge_some(mp);
        }

        /*
         * If asked, update the disk superblock with incore counter values if we
         * are using non-persistent counters so that they don't get too far out
         * of sync if we crash or get a forced shutdown. We don't want to force
         * this to disk, just get a transaction into the iclogs....
         */
        if (flags & SYNC_SUPER)
                xfs_log_sbcount(mp, 0);

        /*
         * Now check to see if the log needs a "dummy" transaction.
         */

        if (!(flags & SYNC_REMOUNT) && xfs_log_need_covered(mp)) {
                xfs_trans_t *tp;
                xfs_inode_t *ip;

                /*
                 * Put a dummy transaction in the log to tell
                 * recovery that all others are OK.
                 */
                tp = xfs_trans_alloc(mp, XFS_TRANS_DUMMY1);
                if ((error = xfs_trans_reserve(tp, 0,
                                XFS_ICHANGE_LOG_RES(mp),
                                0, 0, 0)))  {
                        xfs_trans_cancel(tp, 0);
                        return error;
                }

                ip = mp->m_rootip;
                xfs_ilock(ip, XFS_ILOCK_EXCL);

                xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
                xfs_trans_ihold(tp, ip);
                xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
                error = xfs_trans_commit(tp, 0);
                xfs_iunlock(ip, XFS_ILOCK_EXCL);
                xfs_log_force(mp, (xfs_lsn_t)0, log_flags);
        }

        /*
         * When shutting down, we need to insure that the AIL is pushed
         * to disk or the filesystem can appear corrupt from the PROM.
         */
        if ((flags & (SYNC_CLOSE|SYNC_WAIT)) == (SYNC_CLOSE|SYNC_WAIT)) {
                XFS_bflush(mp->m_ddev_targp);
                if (mp->m_rtdev_targp) {
                        XFS_bflush(mp->m_rtdev_targp);
                }
        }

        return XFS_ERROR(last_error);
}

/*
 * xfs_vget - called by DMAPI and NFSD to get vnode from file handle
 */
STATIC int
xfs_vget(
        bhv_desc_t      *bdp,
        bhv_vnode_t     **vpp,
        fid_t           *fidp)
{
        xfs_mount_t     *mp = XFS_BHVTOM(bdp);
        xfs_fid_t       *xfid = (struct xfs_fid *)fidp;
        xfs_inode_t     *ip;
        int             error;
        xfs_ino_t       ino;
        unsigned int    igen;

        /*
         * Invalid.  Since handles can be created in user space and passed in
         * via gethandle(), this is not cause for a panic.
         */
        if (xfid->xfs_fid_len != sizeof(*xfid) - sizeof(xfid->xfs_fid_len))
                return XFS_ERROR(EINVAL);

        ino  = xfid->xfs_fid_ino;
        igen = xfid->xfs_fid_gen;

        /*
         * NFS can sometimes send requests for ino 0.  Fail them gracefully.
         */
        if (ino == 0)
                return XFS_ERROR(ESTALE);

        error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_SHARED, &ip, 0);
        if (error) {
                *vpp = NULL;
                return error;
        }

        if (ip == NULL) {
                *vpp = NULL;
                return XFS_ERROR(EIO);
        }

        if (ip->i_d.di_mode == 0 || ip->i_d.di_gen != igen) {
                xfs_iput_new(ip, XFS_ILOCK_SHARED);
                *vpp = NULL;
                return XFS_ERROR(ENOENT);
        }

        *vpp = XFS_ITOV(ip);
        xfs_iunlock(ip, XFS_ILOCK_SHARED);
        return 0;
}


#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 */

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 bhv_desc         *bhv,
        char                    *options,
        struct xfs_mount_args   *args,
        int                     update)
{
        bhv_vfs_t               *vfsp = bhvtovfs(bhv);
        char                    *this_char, *value, *eov;
        int                     dsunit, dswidth, vol_dsunit, vol_dswidth;
        int                     iosize;

        /*
         * 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))
                args->flags |= XFSMNT_IDELETE;

        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)) {
                        vfsp->vfs_flag |= VFS_GRPID;
                } else if (!strcmp(this_char, MNTOPT_NOGRPID) ||
                           !strcmp(this_char, MNTOPT_SYSVGROUPS)) {
                        vfsp->vfs_flag &= ~VFS_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_IDELETE;
                } else if (!strcmp(this_char, MNTOPT_NOIKEEP)) {
                        args->flags |= XFSMNT_IDELETE;
                } 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;
                } else if (!strcmp(this_char, MNTOPT_FILESTREAM)) {
                        args->flags2 |= XFSMNT2_FILESTREAMS;
                } 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 ((vfsp->vfs_flag & VFS_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 ((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;
        }

        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)
                vfsp->vfs_flag |= VFS_32BITINODES;
        if (args->flags2)
                args->flags |= XFSMNT_FLAGS2;
        return 0;
}

STATIC int
xfs_showargs(
        struct bhv_desc         *bhv,
        struct seq_file         *m)
{
        static struct proc_xfs_info {
                int     flag;
                char    *str;
        } xfs_info[] = {
                /* the few simple ones we can get from the mount struct */
                { 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 },
                { 0, NULL }
        };
        struct proc_xfs_info    *xfs_infop;
        struct xfs_mount        *mp = XFS_BHVTOM(bhv);
        struct bhv_vfs          *vfsp = XFS_MTOVFS(mp);

        for (xfs_infop = xfs_info; 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_flags & XFS_MOUNT_IDELETE))
                seq_printf(m, "," MNTOPT_IKEEP);
        if (!(mp->m_flags & XFS_MOUNT_COMPAT_IOSIZE))
                seq_printf(m, "," MNTOPT_LARGEIO);

        if (!(vfsp->vfs_flag & VFS_32BITINODES))
                seq_printf(m, "," MNTOPT_64BITINODE);
        if (vfsp->vfs_flag & VFS_GRPID)
                seq_printf(m, "," MNTOPT_GRPID);

        return 0;
}

/*
 * 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_freeze(
        bhv_desc_t      *bdp)
{
        xfs_mount_t     *mp = XFS_BHVTOM(bdp);

        xfs_attr_quiesce(mp);
        xfs_fs_log_dummy(mp);
}


bhv_vfsops_t xfs_vfsops = {
        BHV_IDENTITY_INIT(VFS_BHV_XFS,VFS_POSITION_XFS),
        .vfs_parseargs          = xfs_parseargs,
        .vfs_showargs           = xfs_showargs,
        .vfs_mount              = xfs_mount,
        .vfs_unmount            = xfs_unmount,
        .vfs_mntupdate          = xfs_mntupdate,
        .vfs_root               = xfs_root,
        .vfs_statvfs            = xfs_statvfs,
        .vfs_sync               = xfs_sync,
        .vfs_vget               = xfs_vget,
        .vfs_dmapiops           = (vfs_dmapiops_t)fs_nosys,
        .vfs_quotactl           = (vfs_quotactl_t)fs_nosys,
        .vfs_init_vnode         = xfs_initialize_vnode,
        .vfs_force_shutdown     = xfs_do_force_shutdown,
        .vfs_freeze             = xfs_freeze,
};