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dm: abstract dm_in_flight function 

This patch adds md_in_flight() to get the number of in_flight I/Os.
No functional change.

This patch is a preparation for a later patch in this series, which
changes I/O counter to md->pending from q->in_flight in request-based dm.

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 23:52:13 +00:00 committed by Alasdair G Kergon
parent 9ca170a3c0
commit 90abb8c4ce
1 changed files with 7 additions and 2 deletions
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9
drivers/md/dm.c
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@ -452,6 +452,12 @@ static void free_bio_info(struct dm_rq_clone_bio_info *info)
mempool_free(info, info->tio->md->io_pool);
}
static int md_in_flight(struct mapped_device *md)
{
return atomic_read(&md->pending[READ]) +
atomic_read(&md->pending[WRITE]);
}
static void start_io_acct(struct dm_io *io)
{
struct mapped_device *md = io->md;
@ -2100,8 +2106,7 @@ static int dm_wait_for_completion(struct mapped_device *md, int interruptible)
break;
}
spin_unlock_irqrestore(q->queue_lock, flags);
} else if (!atomic_read(&md->pending[0]) &&
!atomic_read(&md->pending[1]))
} else if (!md_in_flight(md))
break;
if (interruptible == TASK_INTERRUPTIBLE &&