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>

diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index efa3d42..e49c27c 100644 (file)
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -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);