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dm thin: refactor requeue_io to eliminate spinlock bouncing 

Also refactor some other bio_list erroring helpers.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer 2014-10-19 07:52:44 -04:00
parent 9d094eebd7
commit 42d6a8ce3c
1 changed files with 23 additions and 20 deletions
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43
drivers/md/dm-thin.c
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@ -457,21 +457,32 @@ struct dm_thin_endio_hook {
struct rb_node rb_node;
};
static void requeue_bio_list(struct thin_c *tc, struct bio_list *master)
static void __merge_bio_list(struct bio_list *bios, struct bio_list *master)
{
bio_list_merge(bios, master);
bio_list_init(master);
}
static void error_bio_list(struct bio_list *bios, int error)
{
struct bio *bio;
while ((bio = bio_list_pop(bios)))
bio_endio(bio, error);
}
static void error_thin_bio_list(struct thin_c *tc, struct bio_list *master, int error)
{
struct bio_list bios;
unsigned long flags;
bio_list_init(&bios);
spin_lock_irqsave(&tc->lock, flags);
bio_list_merge(&bios, master);
bio_list_init(master);
__merge_bio_list(&bios, master);
spin_unlock_irqrestore(&tc->lock, flags);
while ((bio = bio_list_pop(&bios)))
bio_endio(bio, DM_ENDIO_REQUEUE);
error_bio_list(&bios, error);
}
static void requeue_deferred_cells(struct thin_c *tc)
@ -493,26 +504,18 @@ static void requeue_deferred_cells(struct thin_c *tc)
static void requeue_io(struct thin_c *tc)
{
requeue_bio_list(tc, &tc->deferred_bio_list);
requeue_bio_list(tc, &tc->retry_on_resume_list);
requeue_deferred_cells(tc);
}
static void error_thin_retry_list(struct thin_c *tc)
{
struct bio *bio;
unsigned long flags;
struct bio_list bios;
unsigned long flags;
bio_list_init(&bios);
spin_lock_irqsave(&tc->lock, flags);
bio_list_merge(&bios, &tc->retry_on_resume_list);
bio_list_init(&tc->retry_on_resume_list);
__merge_bio_list(&bios, &tc->deferred_bio_list);
__merge_bio_list(&bios, &tc->retry_on_resume_list);
spin_unlock_irqrestore(&tc->lock, flags);
while ((bio = bio_list_pop(&bios)))
bio_io_error(bio);
error_bio_list(&bios, DM_ENDIO_REQUEUE);
requeue_deferred_cells(tc);
}
static void error_retry_list(struct pool *pool)
@ -521,7 +524,7 @@ static void error_retry_list(struct pool *pool)
rcu_read_lock();
list_for_each_entry_rcu(tc, &pool->active_thins, list)
error_thin_retry_list(tc);
error_thin_bio_list(tc, &tc->retry_on_resume_list, -EIO);
rcu_read_unlock();
}
@ -1752,7 +1755,7 @@ static void process_thin_deferred_bios(struct thin_c *tc)
unsigned count = 0;
if (tc->requeue_mode) {
requeue_bio_list(tc, &tc->deferred_bio_list);
error_thin_bio_list(tc, &tc->deferred_bio_list, DM_ENDIO_REQUEUE);
return;
}