1 files changed, 22 insertions, 0 deletions

diff --git a/fs/xfs/xfs_rw.c b/fs/xfs/xfs_rw.c
index 6fa10897d417..4c199d18f850 100644
--- a/fs/xfs/xfs_rw.c
+++ b/fs/xfs/xfs_rw.c
@@ -336,3 +336,25 @@ xfs_bwrite(
         }
         return (error);
 }
+
+/*
+ * helper function to extract extent size hint from inode
+ */
+xfs_extlen_t
+xfs_get_extsz_hint(
+        struct xfs_inode        *ip)
+{
+        xfs_extlen_t            extsz;
+
+        if (unlikely(XFS_IS_REALTIME_INODE(ip))) {
+                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;
+}