Commit 7d1c520b authored Dec 06, 2006 by Hugh Dickins Committed by Linus Torvalds Dec 07, 2006

[PATCH] ext3 balloc: fix _with_rsv freeze



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>

parent 2823b553

fs/ext3/balloc.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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))