xfs: use xfs_sync_inodes() for device flushing

Currently xfs_device_flush calls sync_blockdev() which is
a no-op for XFS as all it's metadata is held in a different
address to the one sync_blockdev() works on.

Call xfs_sync_inodes() instead to flush all the delayed
allocation blocks out. To do this as efficiently as possible,
do it via two passes - one to do an async flush of all the
dirty blocks and a second to wait for all the IO to complete.
This requires some modification to the xfs-sync_inodes_ag()
flush code to do efficiently.

Signed-off-by: Dave Chinner <david@fromorbit.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index 08ce72316bfe..8b97d82d7a88 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -361,7 +361,7 @@ xfs_flush_space(
                 return 0;
         case 2:
                 xfs_iunlock(ip, XFS_ILOCK_EXCL);
-                xfs_flush_device(ip);
+                xfs_flush_inodes(ip);
                 xfs_ilock(ip, XFS_ILOCK_EXCL);
                 *fsynced = 3;
                 return 0;