From 90abb8c4cec8f0aa4ce58790542e3cf13071601a Mon Sep 17 00:00:00 2001 From: Kiyoshi Ueda Date: Thu, 10 Dec 2009 23:52:13 +0000 Subject: 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 Signed-off-by: Jun'ichi Nomura Signed-off-by: Alasdair G Kergon --- drivers/md/dm.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) (limited to 'drivers/md') diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 473f0c3c0192..73b89afd6565 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -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 && -- cgit v1.2.3