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dm thin: factor out check_low_water_mark and use bools 

Factor check_low_water_mark() out of alloc_data_block().
Change a couple unsigned flags in the pool structure to bool.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Joe Thornber 2013-12-04 20:16:12 -05:00 committed by Mike Snitzer
parent daec338bbd
commit 88a6621bed
1 changed files with 22 additions and 15 deletions
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37
drivers/md/dm-thin.c
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@ -163,8 +163,8 @@ struct pool {
int sectors_per_block_shift;
struct pool_features pf;
unsigned low_water_triggered:1; /* A dm event has been sent */
unsigned no_free_space:1; /* A -ENOSPC warning has been issued */
bool low_water_triggered:1; /* A dm event has been sent */
bool no_free_space:1; /* A -ENOSPC warning has been issued */
struct dm_bio_prison *prison;
struct dm_kcopyd_client *copier;
@ -909,6 +909,20 @@ static int commit(struct pool *pool)
return r;
}
static void check_low_water_mark(struct pool *pool, dm_block_t free_blocks)
{
unsigned long flags;
if (free_blocks <= pool->low_water_blocks && !pool->low_water_triggered) {
DMWARN("%s: reached low water mark for data device: sending event.",
dm_device_name(pool->pool_md));
spin_lock_irqsave(&pool->lock, flags);
pool->low_water_triggered = true;
spin_unlock_irqrestore(&pool->lock, flags);
dm_table_event(pool->ti->table);
}
}
static int alloc_data_block(struct thin_c *tc, dm_block_t *result)
{
int r;
@ -930,14 +944,7 @@ static int alloc_data_block(struct thin_c *tc, dm_block_t *result)
if (r)
return r;
if (free_blocks <= pool->low_water_blocks && !pool->low_water_triggered) {
DMWARN("%s: reached low water mark for data device: sending event.",
dm_device_name(pool->pool_md));
spin_lock_irqsave(&pool->lock, flags);
pool->low_water_triggered = 1;
spin_unlock_irqrestore(&pool->lock, flags);
dm_table_event(pool->ti->table);
}
check_low_water_mark(pool, free_blocks);
if (!free_blocks) {
/*
@ -963,7 +970,7 @@ static int alloc_data_block(struct thin_c *tc, dm_block_t *result)
DMWARN("%s: no free data space available.",
dm_device_name(pool->pool_md));
spin_lock_irqsave(&pool->lock, flags);
pool->no_free_space = 1;
pool->no_free_space = true;
spin_unlock_irqrestore(&pool->lock, flags);
return -ENOSPC;
}
@ -1780,8 +1787,8 @@ static struct pool *pool_create(struct mapped_device *pool_md,
bio_list_init(&pool->deferred_flush_bios);
INIT_LIST_HEAD(&pool->prepared_mappings);
INIT_LIST_HEAD(&pool->prepared_discards);
pool->low_water_triggered = 0;
pool->no_free_space = 0;
pool->low_water_triggered = false;
pool->no_free_space = false;
bio_list_init(&pool->retry_on_resume_list);
pool->shared_read_ds = dm_deferred_set_create();
@ -2298,8 +2305,8 @@ static void pool_resume(struct dm_target *ti)
unsigned long flags;
spin_lock_irqsave(&pool->lock, flags);
pool->low_water_triggered = 0;
pool->no_free_space = 0;
pool->low_water_triggered = false;
pool->no_free_space = false;
__requeue_bios(pool);
spin_unlock_irqrestore(&pool->lock, flags);