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| author | Jerome Marchand <jmarchan@redhat.com> | 2009-03-27 10:31:51 +0100 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2009-04-07 08:12:38 +0200 |
| commit | 26308eab69aa193f7b3fb50764a64ae14544a39b (patch) | |
| tree | 758f6100395a23228d042c3a9d6f7dc1922d7530 /block/blk-merge.c | |
| parent | 6c7e8cee6a9128eeb7f83c3ad1cb243f77f5cb16 (diff) | |
| download | linux-stable-26308eab69aa193f7b3fb50764a64ae14544a39b.tar.gz linux-stable-26308eab69aa193f7b3fb50764a64ae14544a39b.tar.bz2 linux-stable-26308eab69aa193f7b3fb50764a64ae14544a39b.zip | |
block: fix inconsistency in I/O stat accounting code
This forces in_flight to be zero when turning off or on the I/O stat
accounting and stops updating I/O stats in attempt_merge() when
accounting is turned off.
Signed-off-by: Jerome Marchand <jmarchan@redhat.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/blk-merge.c')
| -rw-r--r-- | block/blk-merge.c | 29 |
1 files changed, 17 insertions, 12 deletions
diff --git a/block/blk-merge.c b/block/blk-merge.c index e39cb24b7679..63760ca3da0f 100644 --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -338,6 +338,22 @@ static int ll_merge_requests_fn(struct request_queue *q, struct request *req, return 1; } +static void blk_account_io_merge(struct request *req) +{ + if (blk_do_io_stat(req)) { + struct hd_struct *part; + int cpu; + + cpu = part_stat_lock(); + part = disk_map_sector_rcu(req->rq_disk, req->sector); + + part_round_stats(cpu, part); + part_dec_in_flight(part); + + part_stat_unlock(); + } +} + /* * Has to be called with the request spinlock acquired */ @@ -386,18 +402,7 @@ static int attempt_merge(struct request_queue *q, struct request *req, elv_merge_requests(q, req, next); - if (req->rq_disk) { - struct hd_struct *part; - int cpu; - - cpu = part_stat_lock(); - part = disk_map_sector_rcu(req->rq_disk, req->sector); - - part_round_stats(cpu, part); - part_dec_in_flight(part); - - part_stat_unlock(); - } + blk_account_io_merge(req); req->ioprio = ioprio_best(req->ioprio, next->ioprio); if (blk_rq_cpu_valid(next)) |