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| author | Nick Piggin <npiggin@suse.de> | 2008-04-29 14:48:33 +0200 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2008-04-29 14:48:33 +0200 |
| commit | 75ad23bc0fcb4f992a5d06982bf0857ab1738e9e (patch) | |
| tree | 8668ef63b1f420252ae41aed9e13737d49fd8054 /drivers/md | |
| parent | 68154e90c9d1492d570671ae181d9a8f8530da55 (diff) | |
| download | kernel_samsung_tuna-75ad23bc0fcb4f992a5d06982bf0857ab1738e9e.zip kernel_samsung_tuna-75ad23bc0fcb4f992a5d06982bf0857ab1738e9e.tar.gz kernel_samsung_tuna-75ad23bc0fcb4f992a5d06982bf0857ab1738e9e.tar.bz2 | |
block: make queue flags non-atomic
We can save some atomic ops in the IO path, if we clearly define
the rules of how to modify the queue flags.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/dm-table.c | 7 | ||||
| -rw-r--r-- | drivers/md/md.c | 3 |
2 files changed, 7 insertions, 3 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index 51be533..73326e7 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -873,10 +873,13 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q) q->max_hw_sectors = t->limits.max_hw_sectors; q->seg_boundary_mask = t->limits.seg_boundary_mask; q->bounce_pfn = t->limits.bounce_pfn; + /* XXX: the below will probably go bug. must ensure there can be no + * concurrency on queue_flags, and use the unlocked versions... + */ if (t->limits.no_cluster) - q->queue_flags &= ~(1 << QUEUE_FLAG_CLUSTER); + queue_flag_clear(QUEUE_FLAG_CLUSTER, q); else - q->queue_flags |= (1 << QUEUE_FLAG_CLUSTER); + queue_flag_set(QUEUE_FLAG_CLUSTER, q); } diff --git a/drivers/md/md.c b/drivers/md/md.c index 87620b7..acd716b 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -282,7 +282,8 @@ static mddev_t * mddev_find(dev_t unit) kfree(new); return NULL; } - set_bit(QUEUE_FLAG_CLUSTER, &new->queue->queue_flags); + /* Can be unlocked because the queue is new: no concurrency */ + queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, new->queue); blk_queue_make_request(new->queue, md_fail_request); |