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btrfs: convert block group refcount to refcount_t 

We have refcount_t now with the associated library to handle refcounts,
which gives us extra debugging around reference count mistakes that may
be made.  For example it'll warn on any transition from 0->1 or 0->-1,
which is handy for noticing cases where we've messed up reference
counting.  Convert the block group ref counting from an atomic_t to
refcount_t and use the appropriate helpers.

Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2020-07-06 09:14:11 -04:00 committed by David Sterba
parent 60f8667b61
commit 48aaeebe4e
2 changed files with 5 additions and 6 deletions
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8
fs/btrfs/block-group.c
View File

@ -118,12 +118,12 @@ u64 btrfs_get_alloc_profile(struct btrfs_fs_info *fs_info, u64 orig_flags)
void btrfs_get_block_group(struct btrfs_block_group *cache)
{
atomic_inc(&cache->count);
refcount_inc(&cache->refs);
}
void btrfs_put_block_group(struct btrfs_block_group *cache)
{
if (atomic_dec_and_test(&cache->count)) {
if (refcount_dec_and_test(&cache->refs)) {
WARN_ON(cache->pinned > 0);
WARN_ON(cache->reserved > 0);
@ -1805,7 +1805,7 @@ static struct btrfs_block_group *btrfs_create_block_group_cache(
cache->discard_index = BTRFS_DISCARD_INDEX_UNUSED;
atomic_set(&cache->count, 1);
refcount_set(&cache->refs, 1);
spin_lock_init(&cache->lock);
init_rwsem(&cache->data_rwsem);
INIT_LIST_HEAD(&cache->list);
@ -3380,7 +3380,7 @@ int btrfs_free_block_groups(struct btrfs_fs_info *info)
ASSERT(list_empty(&block_group->dirty_list));
ASSERT(list_empty(&block_group->io_list));
ASSERT(list_empty(&block_group->bg_list));
ASSERT(atomic_read(&block_group->count) == 1);
ASSERT(refcount_read(&block_group->refs) == 1);
btrfs_put_block_group(block_group);
spin_lock(&info->block_group_cache_lock);

3
fs/btrfs/block-group.h
View File

@ -114,8 +114,7 @@ struct btrfs_block_group {
/* For block groups in the same raid type */
struct list_head list;
/* Usage count */
atomic_t count;
refcount_t refs;
/*
* List of struct btrfs_free_clusters for this block group.