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Diffstat (limited to 'kernel/drivers/md/dm-cache-policy-mq.c')
-rw-r--r--kernel/drivers/md/dm-cache-policy-mq.c56
1 files changed, 19 insertions, 37 deletions
diff --git a/kernel/drivers/md/dm-cache-policy-mq.c b/kernel/drivers/md/dm-cache-policy-mq.c
index 515d44bf2..ddb26980c 100644
--- a/kernel/drivers/md/dm-cache-policy-mq.c
+++ b/kernel/drivers/md/dm-cache-policy-mq.c
@@ -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);
@@ -1283,7 +1283,7 @@ static dm_cblock_t mq_residency(struct dm_cache_policy *p)
return r;
}
-static void mq_tick(struct dm_cache_policy *p)
+static void mq_tick(struct dm_cache_policy *p, bool can_block)
{
struct mq_policy *mq = to_mq_policy(p);
unsigned long flags;
@@ -1291,6 +1291,12 @@ static void mq_tick(struct dm_cache_policy *p)
spin_lock_irqsave(&mq->tick_lock, flags);
mq->tick_protected++;
spin_unlock_irqrestore(&mq->tick_lock, flags);
+
+ if (can_block) {
+ mutex_lock(&mq->lock);
+ copy_tick(mq);
+ mutex_unlock(&mq->lock);
+ }
}
static int mq_set_config_value(struct dm_cache_policy *p,
@@ -1323,22 +1329,24 @@ static int mq_set_config_value(struct dm_cache_policy *p,
return 0;
}
-static int mq_emit_config_values(struct dm_cache_policy *p, char *result, unsigned maxlen)
+static int mq_emit_config_values(struct dm_cache_policy *p, char *result,
+ unsigned maxlen, ssize_t *sz_ptr)
{
- ssize_t sz = 0;
+ ssize_t sz = *sz_ptr;
struct mq_policy *mq = to_mq_policy(p);
DMEMIT("10 random_threshold %u "
"sequential_threshold %u "
"discard_promote_adjustment %u "
"read_promote_adjustment %u "
- "write_promote_adjustment %u",
+ "write_promote_adjustment %u ",
mq->tracker.thresholds[PATTERN_RANDOM],
mq->tracker.thresholds[PATTERN_SEQUENTIAL],
mq->discard_promote_adjustment,
mq->read_promote_adjustment,
mq->write_promote_adjustment);
+ *sz_ptr = sz;
return 0;
}
@@ -1402,7 +1410,7 @@ static struct dm_cache_policy *mq_create(dm_cblock_t cache_size,
mq->generation_period = max((unsigned) from_cblock(cache_size), 1024U);
mq->nr_buckets = next_power(from_cblock(cache_size) / 2, 16);
- mq->hash_bits = ffs(mq->nr_buckets) - 1;
+ mq->hash_bits = __ffs(mq->nr_buckets);
mq->table = vzalloc(sizeof(*mq->table) * mq->nr_buckets);
if (!mq->table)
goto bad_alloc_table;
@@ -1423,21 +1431,12 @@ bad_pre_cache_init:
static struct dm_cache_policy_type mq_policy_type = {
.name = "mq",
- .version = {1, 3, 0},
+ .version = {1, 4, 0},
.hint_size = 4,
.owner = THIS_MODULE,
.create = mq_create
};
-static struct dm_cache_policy_type default_policy_type = {
- .name = "default",
- .version = {1, 3, 0},
- .hint_size = 4,
- .owner = THIS_MODULE,
- .create = mq_create,
- .real = &mq_policy_type
-};
-
static int __init mq_init(void)
{
int r;
@@ -1447,36 +1446,21 @@ static int __init mq_init(void)
__alignof__(struct entry),
0, NULL);
if (!mq_entry_cache)
- goto bad;
+ return -ENOMEM;
r = dm_cache_policy_register(&mq_policy_type);
if (r) {
DMERR("register failed %d", r);
- goto bad_register_mq;
- }
-
- r = dm_cache_policy_register(&default_policy_type);
- if (!r) {
- DMINFO("version %u.%u.%u loaded",
- mq_policy_type.version[0],
- mq_policy_type.version[1],
- mq_policy_type.version[2]);
- return 0;
+ kmem_cache_destroy(mq_entry_cache);
+ return -ENOMEM;
}
- DMERR("register failed (as default) %d", r);
-
- dm_cache_policy_unregister(&mq_policy_type);
-bad_register_mq:
- kmem_cache_destroy(mq_entry_cache);
-bad:
- return -ENOMEM;
+ return 0;
}
static void __exit mq_exit(void)
{
dm_cache_policy_unregister(&mq_policy_type);
- dm_cache_policy_unregister(&default_policy_type);
kmem_cache_destroy(mq_entry_cache);
}
@@ -1487,5 +1471,3 @@ module_exit(mq_exit);
MODULE_AUTHOR("Joe Thornber <dm-devel@redhat.com>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("mq cache policy");
-
-MODULE_ALIAS("dm-cache-default");