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[XFS] Fix a possible forced shutdown due to mishandling write barriers 

with remount,ro.

SGI-PV: 951944
SGI-Modid: xfs-linux-melb:xfs-kern:25742a

Signed-off-by: Nathan Scott <nathans@sgi.com>
This commit is contained in:
Nathan Scott 2006-05-08 19:51:28 +10:00
parent 9d21f09ca0
commit d08d389d5a
1 changed files with 9 additions and 18 deletions
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27
fs/xfs/xfs_vfsops.c
View File

@ -669,31 +669,22 @@ xfs_mntupdate(
xfs_mount_t *mp = XFS_BHVTOM(bdp);
int error;
if (args->flags & XFSMNT_BARRIER)
mp->m_flags |= XFS_MOUNT_BARRIER;
else
mp->m_flags &= ~XFS_MOUNT_BARRIER;
if ((vfsp->vfs_flag & VFS_RDONLY) &&
!(*flags & MS_RDONLY)) {
vfsp->vfs_flag &= ~VFS_RDONLY;
if (args->flags & XFSMNT_BARRIER)
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);
}
if (!(vfsp->vfs_flag & VFS_RDONLY) &&
(*flags & MS_RDONLY)) {
} else {
mp->m_flags &= ~XFS_MOUNT_BARRIER;
}
} else if (!(vfsp->vfs_flag & VFS_RDONLY)) { /* rw -> ro */
VFS_SYNC(vfsp, SYNC_FSDATA|SYNC_BDFLUSH|SYNC_ATTR, NULL, error);
xfs_quiesce_fs(mp);
/* Ok now write out an unmount record */
xfs_log_unmount_write(mp);
xfs_unmountfs_writesb(mp);
vfsp->vfs_flag |= VFS_RDONLY;
}
return 0;
}