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| author | Ming Lei <ming.lei@canonical.com> | 2015-08-17 10:31:47 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2015-09-23 11:01:16 -0600 |
| commit | 5b5e20f421c0b6d437b3dec13e53674161998d56 (patch) | |
| tree | 60a9dfefe72548972f93755669586b825c7c3383 /drivers/block/loop.c | |
| parent | 53cbf3b157a0428d40989ab1c7df9228a1976fc2 (diff) | |
| download | linux-5b5e20f421c0b6d437b3dec13e53674161998d56.tar.gz linux-5b5e20f421c0b6d437b3dec13e53674161998d56.tar.bz2 linux-5b5e20f421c0b6d437b3dec13e53674161998d56.zip | |
block: loop: set QUEUE_FLAG_NOMERGES for request queue of loop
It doesn't make sense to enable merge because the I/O
submitted to backing file is handled page by page.
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/block/loop.c')
| -rw-r--r-- | drivers/block/loop.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/block/loop.c b/drivers/block/loop.c index f9889b6bc02c..eee751032cad 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -1595,6 +1595,12 @@ static int loop_add(struct loop_device **l, int i) } lo->lo_queue->queuedata = lo; + /* + * It doesn't make sense to enable merge because the I/O + * submitted to backing file is handled page by page. + */ + queue_flag_set_unlocked(QUEUE_FLAG_NOMERGES, lo->lo_queue); + INIT_LIST_HEAD(&lo->write_cmd_head); INIT_WORK(&lo->write_work, loop_queue_write_work); |