dm log writes: move IO accounting earlier to fix error path

Move log_one_block()'s atomic_inc(&lc->io_blocks) before bio_alloc() to
fix a bug that the target hangs if bio_alloc() fails.  The error path
does put_io_block(lc), so atomic_inc(&lc->io_blocks) must occur before
invoking the error path to avoid underflow of lc->io_blocks.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Reviewed-by: Josef Bacik <jbacik@fb,com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org

diff --git a/drivers/md/dm-log-writes.c b/drivers/md/dm-log-writes.c
index 4ab6803..4cc78ae 100644 (file)
--- a/drivers/md/dm-log-writes.c
+++ b/drivers/md/dm-log-writes.c
@@ -259,12 +259,12 @@ static int log_one_block(struct log_writes_c *lc,
                goto out;
        sector++;
 
+       atomic_inc(&lc->io_blocks);
        bio = bio_alloc(GFP_KERNEL, block->vec_cnt);
        if (!bio) {
                DMERR("Couldn't alloc log bio");
                goto error;
        }
-       atomic_inc(&lc->io_blocks);
        bio->bi_iter.bi_size = 0;
        bio->bi_iter.bi_sector = sector;
        bio->bi_bdev = lc->logdev->bdev;