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GFS2: Fix infinite loop in rbm_find 

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.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Tested-by: Bob Peterson <rpeterso@redhat.com>
Tested-by: Barry Marson <bmarson@redhat.com>
This commit is contained in:
Bob Peterson 2012-09-12 09:40:31 -04:00 committed by Steven Whitehouse
parent ff7f4cb461
commit 3701530aed
1 changed files with 1 additions and 0 deletions
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fs/gfs2/rgrp.c
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@ -329,6 +329,7 @@ static u32 gfs2_free_extlen(const struct gfs2_rbm *rrbm, u32 len)
gfs2_unaligned_extlen(&rbm, 4 - n_unaligned, &len)) gfs2_unaligned_extlen(&rbm, 4 - n_unaligned, &len))
goto out; goto out;
n_unaligned = len & 3;
/* Start is now byte aligned */ /* Start is now byte aligned */
while (len > 3) { while (len > 3) {
start = rbm.bi->bi_bh->b_data; start = rbm.bi->bi_bh->b_data;