1 files changed, 9 insertions, 0 deletions

diff --git a/fs/gfs2/trans.h b/fs/gfs2/trans.h
index edf9d4bd908e..fb56b783e028 100644
--- a/fs/gfs2/trans.h
+++ b/fs/gfs2/trans.h
@@ -20,11 +20,20 @@ struct gfs2_glock;
 #define RES_JDATA       1
 #define RES_DATA        1
 #define RES_LEAF        1
+#define RES_RG_HDR      1
 #define RES_RG_BIT      2
 #define RES_EATTR       1
 #define RES_STATFS      1
 #define RES_QUOTA       2
 
+/* reserve either the number of blocks to be allocated plus the rg header
+ * block, or all of the blocks in the rg, whichever is smaller */
+static inline unsigned int gfs2_rg_blocks(const struct gfs2_alloc *al)
+{
+        return (al->al_requested < al->al_rgd->rd_length)?
+               al->al_requested + 1 : al->al_rgd->rd_length;
+}
+
 int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks,
                      unsigned int revokes);