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dm: use common __issue_target_request for flush and discard support 

Rename __flush_target to __issue_target_request now that it is used to
issue both flush and discard requests.

Introduce __issue_target_requests as a convenient wrapper to
__issue_target_request 'num_flush_requests' or 'num_discard_requests'
times per target.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Mike Snitzer 2010-08-12 04:14:09 +01:00 committed by Alasdair G Kergon
parent 5ae89a8720
commit 06a426cee9
1 changed files with 22 additions and 8 deletions
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30
drivers/md/dm.c
View File

@ -1182,30 +1182,42 @@ static struct dm_target_io *alloc_tio(struct clone_info *ci,
return tio;
}
static void __flush_target(struct clone_info *ci, struct dm_target *ti,
unsigned request_nr)
static void __issue_target_request(struct clone_info *ci, struct dm_target *ti,
unsigned request_nr)
{
struct dm_target_io *tio = alloc_tio(ci, ti);
struct bio *clone;
tio->info.target_request_nr = request_nr;
clone = bio_alloc_bioset(GFP_NOIO, 0, ci->md->bs);
/*
* Discard requests require the bio's inline iovecs be initialized.
* ci->bio->bi_max_vecs is BIO_INLINE_VECS anyway, for both flush
* and discard, so no need for concern about wasted bvec allocations.
*/
clone = bio_alloc_bioset(GFP_NOIO, ci->bio->bi_max_vecs, ci->md->bs);
__bio_clone(clone, ci->bio);
clone->bi_destructor = dm_bio_destructor;
__map_bio(ti, clone, tio);
}
static void __issue_target_requests(struct clone_info *ci, struct dm_target *ti,
unsigned num_requests)
{
unsigned request_nr;
for (request_nr = 0; request_nr < num_requests; request_nr++)
__issue_target_request(ci, ti, request_nr);
}
static int __clone_and_map_empty_barrier(struct clone_info *ci)
{
unsigned target_nr = 0, request_nr;
unsigned target_nr = 0;
struct dm_target *ti;
while ((ti = dm_table_get_target(ci->map, target_nr++)))
for (request_nr = 0; request_nr < ti->num_flush_requests;
request_nr++)
__flush_target(ci, ti, request_nr);
__issue_target_requests(ci, ti, ti->num_flush_requests);
ci->sector_count = 0;
@ -1254,7 +1266,9 @@ static int __clone_and_map_discard(struct clone_info *ci)
*/
return -EOPNOTSUPP;
__clone_and_map_simple(ci, ti);
__issue_target_requests(ci, ti, ti->num_discard_requests);
ci->sector_count = 0;
return 0;
}