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btrfs: update comment for BTRFS_RESERVE_NO_FLUSH

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The comment is incomplete as BTRFS_RESERVE_NO_FLUSH is used for more
reasons than currently holding a transaction handle open. Update the
comment with all the other reasons and give some details.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Filipe Manana 2026-02-02 16:47:02 +00:00 committed by David Sterba
parent 40f2b11c1b
commit f754acce0f
1 changed files with 18 additions and 1 deletions
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19
fs/btrfs/space-info.h
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@ -21,7 +21,24 @@ struct btrfs_block_group;
* The higher the level, the more methods we try to reclaim space.
*/
enum btrfs_reserve_flush_enum {
/* If we are in the transaction, we can't flush anything.*/
/*
* Used when we can't flush or don't need:
*
* 1) We are holding a transaction handle open, so we can't flush as
* that could deadlock.
*
* 2) For a nowait write we don't want to block when reserving delalloc.
*
* 3) Joining a transaction or attaching a transaction, we don't want
* to wait and we don't need to reserve anything (any needed space
* was reserved before in a dedicated block reserve, or we rely on
* the global block reserve, see btrfs_init_root_block_rsv()).
*
* 4) Starting a transaction when we don't need to reserve space, as
* we don't need it because we previously reserved in a dedicated
* block reserve or rely on the global block reserve, like the above
* case.
*/
BTRFS_RESERVE_NO_FLUSH,
/*