1 files changed, 22 insertions, 0 deletions

diff --git a/fs/xfs/xfs_rw.h b/fs/xfs/xfs_rw.h
index ba74000931ec..fcf28dbded7c 100644
--- a/fs/xfs/xfs_rw.h
+++ b/fs/xfs/xfs_rw.h
@@ -77,6 +77,28 @@ xfs_fsb_to_db_io(struct xfs_iocore *io, xfs_fsblock_t fsb)
 #define XFS_FREE_EOF_LOCK       (1<<0)
 #define XFS_FREE_EOF_NOLOCK     (1<<1)
 
+
+/*
+ * helper function to extract extent size hint from inode
+ */
+STATIC_INLINE xfs_extlen_t
+xfs_get_extsz_hint(
+        xfs_inode_t     *ip)
+{
+        xfs_extlen_t    extsz;
+
+        if (unlikely(ip->i_d.di_flags & XFS_DIFLAG_REALTIME)) {
+                extsz = (ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE)
+                                ? ip->i_d.di_extsize
+                                : ip->i_mount->m_sb.sb_rextsize;
+                ASSERT(extsz);
+        } else {
+                extsz = (ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE)
+                                ? ip->i_d.di_extsize : 0;
+        }
+        return extsz;
+}
+
 /*
  * Prototypes for functions in xfs_rw.c.
  */