dm: convey that all flushes are processed as empty
authorMike Snitzer <snitzer@redhat.com>
Wed, 8 Sep 2010 16:07:01 +0000 (18:07 +0200)
committerJens Axboe <jaxboe@fusionio.com>
Fri, 10 Sep 2010 10:35:38 +0000 (12:35 +0200)
commitb372d360df6deaf79a58a02fa0cc0d7e0aa3e92f
treee103bc03bae17f7a995ba44825aefd5fc5fdba66
parent05447420f99c1c44063c7f00054667c022cc1365
dm: convey that all flushes are processed as empty

Rename __clone_and_map_flush to __clone_and_map_empty_flush for added
clarity.

Simplify logic associated with REQ_FLUSH conditionals.

Introduce a BUG_ON() and add a few more helpful comments to the code
so that it is clear that all flushes are empty.

Cleanup __split_and_process_bio() so that an empty flush isn't processed
by a 'sector_count' focused while loop.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
drivers/md/dm.c