gfs2: Check inode generation number in delete_work_func

In delete_work_func, if the iopen glock still has an inode attached,
limit the inode lookup to that specific generation number: in the likely
case that the inode was deleted on the node on which the inode's link
count dropped to zero, we can skip verifying the on-disk block type and
reading in the inode.  The same applies if another node that had the
inode open managed to delete the inode before us.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 76ac2578e658..03ab11fab962 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -380,7 +380,10 @@ struct gfs2_glock {
 	struct delayed_work gl_work;
 	union {
 		/* For iopen glocks only */
-		struct delayed_work gl_delete;
+		struct {
+			struct delayed_work gl_delete;
+			u64 gl_no_formal_ino;
+		};
 		/* For rgrp glocks only */
 		struct {
 			loff_t start;