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dm cache: pass a new 'critical' flag to the policies when requesting writeback work

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We only allow non critical writeback if the origin is idle.  It is up
to the policy to decide what writeback work is critical.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Joe Thornber 2015-05-15 15:20:09 +01:00 committed by Mike Snitzer
parent 066dbaa386
commit 20f6814b94
5 changed files with 13 additions and 7 deletions
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3
drivers/md/dm-cache-policy-cleaner.c
View File

@ -359,7 +359,8 @@ static struct wb_cache_entry *get_next_dirty_entry(struct policy *p)
static int wb_writeback_work(struct dm_cache_policy *pe,
dm_oblock_t *oblock,
dm_cblock_t *cblock)
dm_cblock_t *cblock,
bool critical_only)
{
int r = -ENOENT;
struct policy *p = to_policy(pe);

5
drivers/md/dm-cache-policy-internal.h
View File

@ -55,9 +55,10 @@ static inline int policy_walk_mappings(struct dm_cache_policy *p,
static inline int policy_writeback_work(struct dm_cache_policy *p,
dm_oblock_t *oblock,
dm_cblock_t *cblock)
dm_cblock_t *cblock,
bool critical_only)
{
return p->writeback_work ? p->writeback_work(p, oblock, cblock) : -ENOENT;
return p->writeback_work ? p->writeback_work(p, oblock, cblock, critical_only) : -ENOENT;
}
static inline void policy_remove_mapping(struct dm_cache_policy *p, dm_oblock_t oblock)

2
drivers/md/dm-cache-policy-mq.c
View File

@ -1236,7 +1236,7 @@ static int __mq_writeback_work(struct mq_policy *mq, dm_oblock_t *oblock,
}
static int mq_writeback_work(struct dm_cache_policy *p, dm_oblock_t *oblock,
dm_cblock_t *cblock)
dm_cblock_t *cblock, bool critical_only)
{
int r;
struct mq_policy *mq = to_mq_policy(p);

7
drivers/md/dm-cache-policy.h
View File

@ -178,7 +178,9 @@ struct dm_cache_policy {
int (*remove_cblock)(struct dm_cache_policy *p, dm_cblock_t cblock);
/*
* Provide a dirty block to be written back by the core target.
* Provide a dirty block to be written back by the core target. If
* critical_only is set then the policy should only provide work if
* it urgently needs it.
*
* Returns:
*
@ -186,7 +188,8 @@ struct dm_cache_policy {
*
* -ENODATA: no dirty blocks available
*/
int (*writeback_work)(struct dm_cache_policy *p, dm_oblock_t *oblock, dm_cblock_t *cblock);
int (*writeback_work)(struct dm_cache_policy *p, dm_oblock_t *oblock, dm_cblock_t *cblock,
bool critical_only);
/*
* How full is the cache?

3
drivers/md/dm-cache-target.c
View File

@ -1787,6 +1787,7 @@ static void writeback_some_dirty_blocks(struct cache *cache)
dm_cblock_t cblock;
struct prealloc structs;
struct dm_bio_prison_cell *old_ocell;
bool busy = !iot_idle_for(&cache->origin_tracker, HZ);
memset(&structs, 0, sizeof(structs));
@ -1794,7 +1795,7 @@ static void writeback_some_dirty_blocks(struct cache *cache)
if (prealloc_data_structs(cache, &structs))
break;
r = policy_writeback_work(cache->policy, &oblock, &cblock);
r = policy_writeback_work(cache->policy, &oblock, &cblock, busy);
if (r)
break;