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| author | Tejun Heo <tj@kernel.org> | 2010-09-03 11:56:19 +0200 |
|---|---|---|
| committer | Jens Axboe <jaxboe@fusionio.com> | 2010-09-10 12:35:38 +0200 |
| commit | d87f4c14f27dc82d215108d8392a7d26687148a1 (patch) | |
| tree | 55f2a81f3df5d70fd85c4428089f6fe28540bcf4 /drivers/md/dm-log.c | |
| parent | 3a2edd0d6ddbd5fa3b389ea6db811285415ce6c8 (diff) | |
| download | lwn-d87f4c14f27dc82d215108d8392a7d26687148a1.tar.gz lwn-d87f4c14f27dc82d215108d8392a7d26687148a1.zip | |
dm: implement REQ_FLUSH/FUA support for bio-based dm
This patch converts bio-based dm to support REQ_FLUSH/FUA instead of
now deprecated REQ_HARDBARRIER.
* -EOPNOTSUPP handling logic dropped.
* Preflush is handled as before but postflush is dropped and replaced
with passing down REQ_FUA to member request_queues. This replaces
one array wide cache flush w/ member specific FUA writes.
* __split_and_process_bio() now calls __clone_and_map_flush() directly
for flushes and guarantees all FLUSH bio's going to targets are zero
` length.
* It's now guaranteed that all FLUSH bio's which are passed onto dm
targets are zero length. bio_empty_barrier() tests are replaced
with REQ_FLUSH tests.
* Empty WRITE_BARRIERs are replaced with WRITE_FLUSHes.
* Dropped unlikely() around REQ_FLUSH tests. Flushes are not unlikely
enough to be marked with unlikely().
* Block layer now filters out REQ_FLUSH/FUA bio's if the request_queue
doesn't support cache flushing. Advertise REQ_FLUSH | REQ_FUA
capability.
* Request based dm isn't converted yet. dm_init_request_based_queue()
resets flush support to 0 for now. To avoid disturbing request
based dm code, dm->flush_error is added for bio based dm while
requested based dm continues to use dm->barrier_error.
Lightly tested linear, stripe, raid1, snap and crypt targets. Please
proceed with caution as I'm not familiar with the code base.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: dm-devel@redhat.com
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'drivers/md/dm-log.c')
| -rw-r--r-- | drivers/md/dm-log.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/md/dm-log.c b/drivers/md/dm-log.c index 5a08be0222db..33420e68d153 100644 --- a/drivers/md/dm-log.c +++ b/drivers/md/dm-log.c @@ -300,7 +300,7 @@ static int flush_header(struct log_c *lc) .count = 0, }; - lc->io_req.bi_rw = WRITE_BARRIER; + lc->io_req.bi_rw = WRITE_FLUSH; return dm_io(&lc->io_req, 1, &null_location, NULL); } |