Add some comments to struct btrfs_fs_info to explicitly document which
members are protected by the spinlock unused_bgs_lock. It is currently
used to protect two linked lists, the reclaim_bgs and unused_bgs lists.
So add an explicit comment on top of each list to mention its protected
by unused_bgs_lock, as well as comment on top of unused_bgs_lock to
mention the lists it protects.
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Boris Burkov <boris@bur.io>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
/* Reclaim partially filled block groups in the background */
struct work_struct reclaim_bgs_work;
+ /* Protected by unused_bgs_lock. */
struct list_head reclaim_bgs;
int bg_reclaim_threshold;
+ /* Protects the lists unused_bgs and reclaim_bgs. */
spinlock_t unused_bgs_lock;
+ /* Protected by unused_bgs_lock. */
struct list_head unused_bgs;
struct mutex unused_bg_unpin_mutex;
/* Protect block groups that are going to be deleted */