[Cluster-devel] [GFS2 PATCH] GFS2: Fix infinite loop in rbm_find
Bob Peterson
rpeterso at redhat.com
Wed Sep 12 13:40:31 UTC 2012
Hi,
This patch fixes an infinite loop in gfs2_rbm_find that was introduced
by the previous patch. The problem occurred when the length was less
than 3 but the rbm block was byte-aligned, causing it to improperly
return a extent length of zero, which caused it to spin.
Regards,
Bob Peterson
Red Hat File Systems
Signed-off-by: Bob Peterson <rpeterso at redhat.com>
---
fs/gfs2/rgrp.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index b933cdc..3cc402c 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -329,6 +329,7 @@ static u32 gfs2_free_extlen(const struct gfs2_rbm *rrbm, u32 len)
gfs2_unaligned_extlen(&rbm, 4 - n_unaligned, &len))
goto out;
+ n_unaligned = len & 3;
/* Start is now byte aligned */
while (len > 3) {
start = rbm.bi->bi_bh->b_data;
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