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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>
This commit is contained in:
Chandan Rajendra 2016-12-25 19:01:03 +05:30 committed by Jens Axboe
parent 8e5d31eb02
commit 6c006a9d94
1 changed files with 1 additions and 1 deletions
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2
fs/buffer.c
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@ -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;