Merge tag 'for-linus-20140405' of git://git.infradead.org/linux-mtd

[linux-2.6-microblaze.git] / fs / xfs / xfs_bmap.h

diff --git a/fs/xfs/xfs_bmap.h b/fs/xfs/xfs_bmap.h
index 33b41f3..f84bd7a 100644 (file)
--- a/fs/xfs/xfs_bmap.h
+++ b/fs/xfs/xfs_bmap.h
@@ -127,6 +127,16 @@ static inline void xfs_bmap_init(xfs_bmap_free_t *flp, xfs_fsblock_t *fbp)
        { BMAP_RIGHT_FILLING,   "RF" }, \
        { BMAP_ATTRFORK,        "ATTR" }
 
+
+/*
+ * This macro is used to determine how many extents will be shifted
+ * in one write transaction. We could require two splits,
+ * an extent move on the first and an extent merge on the second,
+ * So it is proper that one extent is shifted inside write transaction
+ * at a time.
+ */
+#define XFS_BMAP_MAX_SHIFT_EXTENTS     1
+
 #ifdef DEBUG
 void   xfs_bmap_trace_exlist(struct xfs_inode *ip, xfs_extnum_t cnt,
                int whichfork, unsigned long caller_ip);
@@ -169,5 +179,10 @@ int        xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip,
 int    xfs_check_nostate_extents(struct xfs_ifork *ifp, xfs_extnum_t idx,
                xfs_extnum_t num);
 uint   xfs_default_attroffset(struct xfs_inode *ip);
+int    xfs_bmap_shift_extents(struct xfs_trans *tp, struct xfs_inode *ip,
+               int *done, xfs_fileoff_t start_fsb,
+               xfs_fileoff_t offset_shift_fsb, xfs_extnum_t *current_ext,
+               xfs_fsblock_t *firstblock, struct xfs_bmap_free *flist,
+               int num_exts);
 
 #endif /* __XFS_BMAP_H__ */