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dm thin: speed up cell_defer_no_holder() 

Reduce the time that a spinlock is held in cell_defer_no_holder().

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
This commit is contained in:
Joe Thornber 2023-03-22 13:34:49 +00:00 committed by Mike Snitzer
parent 56c5de4406
commit bb46c56165
1 changed files with 8 additions and 6 deletions
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14
drivers/md/dm-thin.c
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@ -883,15 +883,17 @@ static void cell_defer_no_holder(struct thin_c *tc, struct dm_bio_prison_cell *c
{
struct pool *pool = tc->pool;
unsigned long flags;
int has_work;
struct bio_list bios;
spin_lock_irqsave(&tc->lock, flags);
cell_release_no_holder(pool, cell, &tc->deferred_bio_list);
has_work = !bio_list_empty(&tc->deferred_bio_list);
spin_unlock_irqrestore(&tc->lock, flags);
bio_list_init(&bios);
cell_release_no_holder(pool, cell, &bios);
if (has_work)
if (!bio_list_empty(&bios)) {
spin_lock_irqsave(&tc->lock, flags);
bio_list_merge(&tc->deferred_bio_list, &bios);
spin_unlock_irqrestore(&tc->lock, flags);
wake_worker(pool);
}
}
static void thin_defer_bio(struct thin_c *tc, struct bio *bio);