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btrfs: update documentation for a block group's bg_list member

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Currently we are only documenting two uses of the bg_list member of a
block group, but there two more:

1) To track deleted block groups for discard purposes, introduced in
   commit e33e17ee1098 ("btrfs: add missing discards when unpinning
   extents with -o discard");

2) To track block groups for automatic reclaim, introduced more recently
   by commit 18bb8bbf13c1 ("btrfs: zoned: automatically reclaim zones")

So document those two other use cases.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.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 2023-06-06 15:26:03 +01:00 committed by David Sterba
parent 7e27180994
commit aadb164bdd
1 changed files with 8 additions and 1 deletions
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9
fs/btrfs/block-group.h
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@ -162,7 +162,14 @@ struct btrfs_block_group {
*/
struct list_head cluster_list;
/* For delayed block group creation or deletion of empty block groups */
/*
* Used for several lists:
*
* 1) struct btrfs_fs_info::unused_bgs
* 2) struct btrfs_fs_info::reclaim_bgs
* 3) struct btrfs_transaction::deleted_bgs
* 4) struct btrfs_trans_handle::new_bgs
*/
struct list_head bg_list;
/* For read-only block groups */