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[PATCH] ext3 balloc: fix _with_rsv freeze

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Port fix to the off-by-one in find_next_usable_block's memscan from ext2 to
ext3; but it didn't cause a serious problem for ext3 because the additional
ext3_test_allocatable check rescued it from the error.

Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Cc: <linux-ext4@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Hugh Dickins 2006-12-06 20:41:30 -08:00 committed by Linus Torvalds
parent 2823b5535e
commit 7d1c520bb5
1 changed files with 1 additions and 1 deletions
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2
fs/ext3/balloc.c
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@ -730,7 +730,7 @@ find_next_usable_block(ext3_grpblk_t start, struct buffer_head *bh,
here = 0;
p = ((char *)bh->b_data) + (here >> 3);
r = memscan(p, 0, (maxblocks - here + 7) >> 3);
r = memscan(p, 0, ((maxblocks + 7) >> 3) - (here >> 3));
next = (r - ((char *)bh->b_data)) << 3;
if (next < maxblocks && next >= start && ext3_test_allocatable(next, bh))