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dm: abstract clone_rq 

This patch factors out the request cloning code in dm_prep_fn()
as clone_rq().  No functional change.

This patch is a preparation for a later patch in this series which needs to
make clones from an original barrier request.

Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Kiyoshi Ueda 2009-12-10 23:52:15 +00:00 committed by Alasdair G Kergon
parent 0888564393
commit 6facdaff22
1 changed files with 28 additions and 17 deletions
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45
drivers/md/dm.c
View File

@ -1445,6 +1445,32 @@ static int setup_clone(struct request *clone, struct request *rq,
return 0;
}
static struct request *clone_rq(struct request *rq, struct mapped_device *md,
gfp_t gfp_mask)
{
struct request *clone;
struct dm_rq_target_io *tio;
tio = alloc_rq_tio(md, gfp_mask);
if (!tio)
return NULL;
tio->md = md;
tio->ti = NULL;
tio->orig = rq;
tio->error = 0;
memset(&tio->info, 0, sizeof(tio->info));
clone = &tio->clone;
if (setup_clone(clone, rq, tio)) {
/* -ENOMEM */
free_rq_tio(tio);
return NULL;
}
return clone;
}
static int dm_rq_flush_suspending(struct mapped_device *md)
{
return !md->suspend_rq.special;
@ -1456,7 +1482,6 @@ static int dm_rq_flush_suspending(struct mapped_device *md)
static int dm_prep_fn(struct request_queue *q, struct request *rq)
{
struct mapped_device *md = q->queuedata;
struct dm_rq_target_io *tio;
struct request *clone;
if (unlikely(rq == &md->suspend_rq)) {
@ -1472,24 +1497,10 @@ static int dm_prep_fn(struct request_queue *q, struct request *rq)
return BLKPREP_KILL;
}
tio = alloc_rq_tio(md, GFP_ATOMIC);
if (!tio)
/* -ENOMEM */
clone = clone_rq(rq, md, GFP_ATOMIC);
if (!clone)
return BLKPREP_DEFER;
tio->md = md;
tio->ti = NULL;
tio->orig = rq;
tio->error = 0;
memset(&tio->info, 0, sizeof(tio->info));
clone = &tio->clone;
if (setup_clone(clone, rq, tio)) {
/* -ENOMEM */
free_rq_tio(tio);
return BLKPREP_DEFER;
}
rq->special = clone;
rq->cmd_flags |= REQ_DONTPREP;