[XFS] Fix remount,readonly path to flush everything correctly.

The remount readonly path can fail to writeback properly because we still
have active transactions after calling xfs_quiesce_fs(). Further
investigation shows that this path is broken in the same ways that the xfs
freeze path was broken so fix it the same way.

SGI-PV: 964464
SGI-Modid: xfs-linux-melb:xfs-kern:28869a

Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Tim Shimmin <tes@sgi.com>

1 files changed, 31 insertions, 22 deletions

diff --git a/fs/xfs/xfs_vfsops.c b/fs/xfs/xfs_vfsops.c
index 3a647339f40e..c343fde10ef9 100644
--- a/fs/xfs/xfs_vfsops.c
+++ b/fs/xfs/xfs_vfsops.c
@@ -640,7 +640,7 @@ xfs_quiesce_fs(
          * we can write the unmount record.
          */
         do {
-                xfs_syncsub(mp, SYNC_REMOUNT|SYNC_ATTR|SYNC_WAIT, NULL);
+                xfs_syncsub(mp, SYNC_INODE_QUIESCE, NULL);
                 pincount = xfs_flush_buftarg(mp->m_ddev_targp, 1);
                 if (!pincount) {
                         delay(50);
@@ -651,6 +651,30 @@ xfs_quiesce_fs(
         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,
@@ -670,11 +694,8 @@ xfs_mntupdate(
                         mp->m_flags &= ~XFS_MOUNT_BARRIER;
                 }
         } else if (!(vfsp->vfs_flag & VFS_RDONLY)) {    /* rw -> ro */
-                bhv_vfs_sync(vfsp, SYNC_FSDATA|SYNC_BDFLUSH|SYNC_ATTR, NULL);
-                xfs_quiesce_fs(mp);
-                xfs_log_sbcount(mp, 1);
-                xfs_log_unmount_write(mp);
-                xfs_unmountfs_writesb(mp);
+                bhv_vfs_sync(vfsp, SYNC_DATA_QUIESCE, NULL);
+                xfs_attr_quiesce(mp);
                 vfsp->vfs_flag |= VFS_RDONLY;
         }
         return 0;
@@ -1952,9 +1973,9 @@ xfs_showargs(
 }
 
 /*
- * Second stage of a freeze. The data is already frozen, 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.
+ * 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(
@@ -1962,19 +1983,7 @@ xfs_freeze(
 {
         xfs_mount_t     *mp = XFS_BHVTOM(bdp);
 
-        /* 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);
+        xfs_attr_quiesce(mp);
         xfs_fs_log_dummy(mp);
 }