xfs: make file range exchange support realtime files

Now that bmap items support the realtime device, we can add the
necessary pieces to the file range exchange code to support exchanging
mappings.  All we really need to do here is adjust the blockcount
upwards to the end of the rt extent and remove the inode checks.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>

1 files changed, 9 insertions, 0 deletions

diff --git a/fs/xfs/xfs_exchrange.c b/fs/xfs/xfs_exchrange.c
index 0fc95e6471cb..90baf12bd97f 100644
--- a/fs/xfs/xfs_exchrange.c
+++ b/fs/xfs/xfs_exchrange.c
@@ -21,6 +21,7 @@
 #include "xfs_sb.h"
 #include "xfs_icache.h"
 #include "xfs_log.h"
+#include "xfs_rtbitmap.h"
 #include <linux/fsnotify.h>
 
 /* Lock (and optionally join) two inodes for a file range exchange. */
@@ -182,6 +183,14 @@ xfs_exchrange_mappings(
 	if (fxr->flags & XFS_EXCHANGE_RANGE_FILE1_WRITTEN)
 		req.flags |= XFS_EXCHMAPS_INO1_WRITTEN;
 
+	/*
+	 * Round the request length up to the nearest file allocation unit.
+	 * The prep function already checked that the request offsets and
+	 * length in @fxr are safe to round up.
+	 */
+	if (xfs_inode_has_bigrtalloc(ip2))
+		req.blockcount = xfs_rtb_roundup_rtx(mp, req.blockcount);
+
 	error = xfs_exchrange_estimate(&req);
 	if (error)
 		return error;