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authorHugh Dickins <hugh@veritas.com>2006-12-06 20:39:26 -0800
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-07 08:39:43 -0800
commitec0837f230e57afde65db72539e748d2a75abed0 (patch)
treec997afd235decff9f36b5cc4bfae5e132d86f656
parent341cee438593ff9c4520fb73c561460074f29a9a (diff)
downloadop-kernel-dev-ec0837f230e57afde65db72539e748d2a75abed0.zip
op-kernel-dev-ec0837f230e57afde65db72539e748d2a75abed0.tar.gz
[PATCH] ext4 balloc: fix _with_rsv freeze
Port fix to the off-by-one in find_next_usable_block's memscan from ext2 to ext4; but it didn't cause a serious problem for ext4 because the additional ext4_test_allocatable check rescued it from the error. [akpm@osdl.org: build fix] 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>
-rw-r--r--fs/ext4/balloc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index 1c8ef0e..c4dd110 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -747,7 +747,7 @@ find_next_usable_block(ext4_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 && ext4_test_allocatable(next, bh))
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