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dm clone: add bucket_lock_irq/bucket_unlock_irq helpers 

Introduce bucket_lock_irq() and bucket_unlock_irq() helpers and use them
in places where it is known that interrupts are enabled.

Signed-off-by: Nikos Tsironis <ntsironis@arrikto.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Nikos Tsironis 2019-10-07 20:54:41 +03:00 committed by Mike Snitzer
parent 6ca43ed837
commit 52c67d416b
1 changed files with 19 additions and 15 deletions
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34
drivers/md/dm-clone-target.c
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@ -552,6 +552,12 @@ struct hash_table_bucket {
#define bucket_unlock_irqrestore(bucket, flags) \
spin_unlock_irqrestore(&(bucket)->lock, flags)
#define bucket_lock_irq(bucket) \
spin_lock_irq(&(bucket)->lock)
#define bucket_unlock_irq(bucket) \
spin_unlock_irq(&(bucket)->lock)
static int hash_table_init(struct clone *clone)
{
unsigned int i, sz;
@ -849,7 +855,6 @@ static void hydration_overwrite(struct dm_clone_region_hydration *hd, struct bio
*/
static void hydrate_bio_region(struct clone *clone, struct bio *bio)
{
unsigned long flags;
unsigned long region_nr;
struct hash_table_bucket *bucket;
struct dm_clone_region_hydration *hd, *hd2;
@ -857,19 +862,19 @@ static void hydrate_bio_region(struct clone *clone, struct bio *bio)
region_nr = bio_to_region(clone, bio);
bucket = get_hash_table_bucket(clone, region_nr);
bucket_lock_irqsave(bucket, flags);
bucket_lock_irq(bucket);
hd = __hash_find(bucket, region_nr);
if (hd) {
/* Someone else is hydrating the region */
bio_list_add(&hd->deferred_bios, bio);
bucket_unlock_irqrestore(bucket, flags);
bucket_unlock_irq(bucket);
return;
}
if (dm_clone_is_region_hydrated(clone->cmd, region_nr)) {
/* The region has been hydrated */
bucket_unlock_irqrestore(bucket, flags);
bucket_unlock_irq(bucket);
issue_bio(clone, bio);
return;
}
@ -878,16 +883,16 @@ static void hydrate_bio_region(struct clone *clone, struct bio *bio)
* We must allocate a hydration descriptor and start the hydration of
* the corresponding region.
*/
bucket_unlock_irqrestore(bucket, flags);
bucket_unlock_irq(bucket);
hd = alloc_hydration(clone);
hydration_init(hd, region_nr);
bucket_lock_irqsave(bucket, flags);
bucket_lock_irq(bucket);
/* Check if the region has been hydrated in the meantime. */
if (dm_clone_is_region_hydrated(clone->cmd, region_nr)) {
bucket_unlock_irqrestore(bucket, flags);
bucket_unlock_irq(bucket);
free_hydration(hd);
issue_bio(clone, bio);
return;
@ -897,7 +902,7 @@ static void hydrate_bio_region(struct clone *clone, struct bio *bio)
if (hd2 != hd) {
/* Someone else started the region's hydration. */
bio_list_add(&hd2->deferred_bios, bio);
bucket_unlock_irqrestore(bucket, flags);
bucket_unlock_irq(bucket);
free_hydration(hd);
return;
}
@ -909,7 +914,7 @@ static void hydrate_bio_region(struct clone *clone, struct bio *bio)
*/
if (unlikely(get_clone_mode(clone) >= CM_READ_ONLY)) {
hlist_del(&hd->h);
bucket_unlock_irqrestore(bucket, flags);
bucket_unlock_irq(bucket);
free_hydration(hd);
bio_io_error(bio);
return;
@ -923,11 +928,11 @@ static void hydrate_bio_region(struct clone *clone, struct bio *bio)
* to the destination device.
*/
if (is_overwrite_bio(clone, bio)) {
bucket_unlock_irqrestore(bucket, flags);
bucket_unlock_irq(bucket);
hydration_overwrite(hd, bio);
} else {
bio_list_add(&hd->deferred_bios, bio);
bucket_unlock_irqrestore(bucket, flags);
bucket_unlock_irq(bucket);
hydration_copy(hd, 1);
}
}
@ -994,7 +999,6 @@ static unsigned long __start_next_hydration(struct clone *clone,
unsigned long offset,
struct batch_info *batch)
{
unsigned long flags;
struct hash_table_bucket *bucket;
struct dm_clone_region_hydration *hd;
unsigned long nr_regions = clone->nr_regions;
@ -1008,13 +1012,13 @@ static unsigned long __start_next_hydration(struct clone *clone,
break;
bucket = get_hash_table_bucket(clone, offset);
bucket_lock_irqsave(bucket, flags);
bucket_lock_irq(bucket);
if (!dm_clone_is_region_hydrated(clone->cmd, offset) &&
!__hash_find(bucket, offset)) {
hydration_init(hd, offset);
__insert_region_hydration(bucket, hd);
bucket_unlock_irqrestore(bucket, flags);
bucket_unlock_irq(bucket);
/* Batch hydration */
__batch_hydration(batch, hd);
@ -1022,7 +1026,7 @@ static unsigned long __start_next_hydration(struct clone *clone,
return (offset + 1);
}
bucket_unlock_irqrestore(bucket, flags);
bucket_unlock_irq(bucket);
} while (++offset < nr_regions);