[Cluster-devel] [GFS2 PATCH] gfs2: write revokes should traverse sd_ail1_list in reverse

[Cluster-devel] [GFS2 PATCH] gfs2: write revokes should traverse sd_ail1_list in reverse

[Bob Peterson]

Hi,

All the other functions that deal with the sd_ail_list run the list
from the tail back to the head, iow, in reverse. We should do the
same while writing revokes, otherwise we might miss removing entries
properly from the list when we hit the limit of how many revokes we
can write at one time (based on block size, which determines how
many block pointers will fit in the revoke block).

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
---
 fs/gfs2/log.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index 96706a2bd2b6..99dd58694ba1 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -621,7 +621,7 @@ void gfs2_write_revokes(struct gfs2_sbd *sdp)
 
 	gfs2_ail1_empty(sdp);
 	spin_lock(&sdp->sd_ail_lock);
-	list_for_each_entry(tr, &sdp->sd_ail1_list, tr_list) {
+	list_for_each_entry_reverse(tr, &sdp->sd_ail1_list, tr_list) {
 		list_for_each_entry(bd, &tr->tr_ail2_list, bd_ail_st_list) {
 			if (list_empty(&bd->bd_list)) {
 				have_revokes = 1;
@@ -645,7 +645,7 @@ void gfs2_write_revokes(struct gfs2_sbd *sdp)
 	}
 	gfs2_log_lock(sdp);
 	spin_lock(&sdp->sd_ail_lock);
-	list_for_each_entry(tr, &sdp->sd_ail1_list, tr_list) {
+	list_for_each_entry_reverse(tr, &sdp->sd_ail1_list, tr_list) {
 		list_for_each_entry_safe(bd, tmp, &tr->tr_ail2_list, bd_ail_st_list) {
 			if (max_revokes == 0)
 				goto out_of_blocks;