[Cluster-devel] [PATCH 04/32] gfs2: fix infinite loop in gfs2_ail1_flush on io error

[Bob Peterson <rpeterso@redhat.com>]

Before this patch, an IO error encountered in function gfs2_ail1_flush
would cause a deadlock: because of the io error (and its resulting
withdrawn state), buffers stopped being written to the journal.
Buffers would remain on the ail1 list, so gfs2_ail1_start_one would
return 1 to indicate dirty buffers were still on the ail1 list.
However, when function gfs2_ail1_flush got a non-zero return code,
it would goto restart to retry the writes, which meant it would never
finish, and thus the infinite loop.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
---
 fs/gfs2/log.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index a36889eea302..6d6013c05e05 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -163,7 +163,7 @@ void gfs2_ail1_flush(struct gfs2_sbd *sdp, struct writeback_control *wbc)
 	list_for_each_entry_reverse(tr, head, tr_list) {
 		if (wbc->nr_to_write <= 0)
 			break;
-		if (gfs2_ail1_start_one(sdp, wbc, tr))
+		if (gfs2_ail1_start_one(sdp, wbc, tr) && !gfs2_withdrawn(sdp))
 			goto restart;
 	}
 	spin_unlock(&sdp->sd_ail_lock);
-- 
2.23.0