Commit 6c006a9d authored Dec 25, 2016 by Chandan Rajendra Committed by Jens Axboe Jan 02, 2017

clean_bdev_aliases: Prevent cleaning blocks that are not in block range



The first block to be cleaned may start at a non-zero page offset. In
such a scenario clean_bdev_aliases() will end up cleaning blocks that
do not fall in the range of blocks to be cleaned. This commit fixes the
issue by skipping blocks that do not fall in valid block range.

Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

parent 8e5d31eb

fs/buffer.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1660,7 +1660,7 @@ void clean_bdev_aliases(struct block_device *bdev, sector_t block, sector_t len)
		head = page_buffers(page);
		bh = head;
		do {
		if (!buffer_mapped(bh))
		if (!buffer_mapped(bh) \|\| (bh->b_blocknr < block))
		goto next;
		if (bh->b_blocknr >= block + len)
		break;