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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"
#include "xfs_vnodeops.h"
#include "xfs_vfsops.h"


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 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 (!(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);
            }
      }

      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);
      }

      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;
}

/*
 * 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.
 */
int
xfs_mount(
      struct xfs_mount  *mp,
      struct xfs_mount_args   *args,
      cred_t                  *credp)
{
      struct block_device     *ddev, *logdev, *rtdev;
      int               flags = 0, error;

      ddev = mp->m_super->s_bdev;
      logdev = rtdev = NULL;

      error = xfs_dmops_get(mp, args);
      if (error)
            return error;
      error = xfs_qmops_get(mp, args);
      if (error)
            return error;

      mp->m_io_ops = 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(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 && 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(mp, args, flags);
      if (error)
            goto error2;

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

      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);
      xfs_qmops_put(mp);
      xfs_dmops_put(mp);
      return error;
}

int
xfs_unmount(
      xfs_mount_t *mp,
      int         flags,
      cred_t            *credp)
{
      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 (mp->m_flags & XFS_MOUNT_DMAPI) {
            error = XFS_SEND_PREUNMOUNT(mp,
                        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, SYNC_WAIT | SYNC_CLOSE);
            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, 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);
            xfs_qmops_put(mp);
            xfs_dmops_put(mp);
            kmem_free(mp, sizeof(xfs_mount_t));
      }

      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);
}

int
xfs_mntupdate(
      struct xfs_mount        *mp,
      int                     *flags,
      struct xfs_mount_args         *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;
      }
      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
 */
int
xfs_root(
      xfs_mount_t *mp,
      bhv_vnode_t **vpp)
{
      bhv_vnode_t *vp;

      vp = XFS_ITOV(mp->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.
 */
int
xfs_statvfs(
      xfs_mount_t *mp,
      bhv_statvfs_t     *statp,
      bhv_vnode_t *vp)
{
      __uint64_t  fakeinos;
      xfs_extlen_t      lsize;
      xfs_sb_t    *sbp;
      unsigned long     s;

      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;

      if (vp)
            XFS_QM_DQSTATVFS(xfs_vtoi(vp), statp);
      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.
 *
 */
int
xfs_sync(
      xfs_mount_t *mp,
      int         flags)
{
      int         error;

      /*
       * Get the Quota Manager to flush the dquots.
       *
       * If XFS quota support is not enabled or this filesystem
       * instance does not use quotas XFS_QM_DQSYNC will always
       * return zero.
       */
      error = XFS_QM_DQSYNC(mp, flags);
      if (error) {
            /*
             * If we got an IO error, we will be shutting down.
             * So, there's nothing more for us to do here.
             */
            ASSERT(error != EIO || XFS_FORCED_SHUTDOWN(mp));
            if (XFS_FORCED_SHUTDOWN(mp))
                  return XFS_ERROR(error);
      }

      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 (mp->m_flags & XFS_MOUNT_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))
                              xfs_tosspages(ip, 0, -1,
                                               FI_REMAPF);
                        else
                              error = xfs_flushinval_pages(ip,
                                          0, -1, FI_REMAPF);
                  } else if ((flags & SYNC_DELWRI) && VN_DIRTY(vp)) {
                        error = xfs_flush_pages(ip, 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(ip);

                  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
 */
int
xfs_vget(
      xfs_mount_t *mp,
      bhv_vnode_t **vpp,
      xfs_fid_t   *xfid)
{
      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->fid_len != sizeof(*xfid) - sizeof(xfid->fid_len))
            return XFS_ERROR(EINVAL);

      ino  = xfid->fid_ino;
      igen = xfid->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 */
#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;
}

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               ikeep = 0;

      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)) {
                  ikeep = 1;
                  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, 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) && !ikeep)
            args->flags |= XFSMNT_IDELETE;

      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;
}

int
xfs_showargs(
      struct xfs_mount  *mp,
      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;

      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 (!(mp->m_flags & XFS_MOUNT_SMALL_INUMS))
            seq_printf(m, "," MNTOPT_64BITINODE);
      if (mp->m_flags & XFS_MOUNT_GRPID)
            seq_printf(m, "," MNTOPT_GRPID);

      if (mp->m_qflags & XFS_UQUOTA_ACCT) {
            if (mp->m_qflags & XFS_UQUOTA_ENFD)
                  seq_puts(m, "," MNTOPT_USRQUOTA);
            else
                  seq_puts(m, "," MNTOPT_UQUOTANOENF);
      }

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

      if (mp->m_qflags & XFS_GQUOTA_ACCT) {
            if (mp->m_qflags & XFS_OQUOTA_ENFD)
                  seq_puts(m, "," MNTOPT_GRPQUOTA);
            else
                  seq_puts(m, "," MNTOPT_GQUOTANOENF);
      }

      if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
            seq_puts(m, "," MNTOPT_NOQUOTA);

      if (mp->m_flags & XFS_MOUNT_DMAPI)
            seq_puts(m, "," MNTOPT_DMAPI);
      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.
 */
void
xfs_freeze(
      xfs_mount_t *mp)
{
      xfs_attr_quiesce(mp);
      xfs_fs_log_dummy(mp);
}

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