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btrfs: document what the spinlock unused_bgs_lock protects

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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>
This commit is contained in:
Filipe Manana 2024-01-25 09:53:23 +00:00 committed by David Sterba
parent 91701bdfa2
commit 4d9450113e
1 changed files with 3 additions and 0 deletions
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3
fs/btrfs/fs.h
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@ -731,10 +731,13 @@ struct btrfs_fs_info {
/* 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 */