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btrfs: add comments regarding locking to struct btrfs_delayed_ref_root

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Add some comments to struct btrfs_delayed_ref_root's fields to mention
what its spinlock protects.

Reviewed-by: Boris Burkov <boris@bur.io>
Reviewed-by: Qu Wenruo <wqu@suse.com>
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
2024-10-23 14:03:44 +01:00
committed by David Sterba
parent a8985ac6be
commit d3aaeea771
1 changed files with 17 additions and 3 deletions
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20
fs/btrfs/delayed-ref.h
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@@ -213,19 +213,33 @@ struct btrfs_delayed_ref_root {
*/
struct xarray dirty_extents;
/* this spin lock protects the rbtree and the entries inside */
/*
* Protects the rbtree href_root, its entries and the following fields:
* num_heads, num_heads_ready, pending_csums and run_delayed_start.
*/
spinlock_t lock;
/* total number of head nodes in tree */
/* Total number of head refs, protected by the spinlock 'lock'. */
unsigned long num_heads;
/* total number of head nodes ready for processing */
/*
* Total number of head refs ready for processing, protected by the
* spinlock 'lock'.
*/
unsigned long num_heads_ready;
/*
* Track space reserved for deleting csums of data extents.
* Protected by the spinlock 'lock'.
*/
u64 pending_csums;
unsigned long flags;
/*
* Track from which bytenr to start searching ref heads.
* Protected by the spinlock 'lock'.
*/
u64 run_delayed_start;
/*