tree f7b3d3e7501084c2228997f074b3978a81918bab
parent 3eab887a55424fc2c27553b7bfe32330df83f7b8
author Mikulas Patocka <mpatocka@redhat.com> 1472587913 -0400
committer Mike Snitzer <snitzer@redhat.com> 1472588209 -0400

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