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btrfs: move comments to btrfs_loop_type definition

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Some of these loop types aren't described, and they should be with the
definitions to make it easier to tell what each of them do.

Reviewed-by: Boris Burkov <boris@bur.io>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2023-07-20 16:12:15 -04:00 committed by David Sterba
parent 7f9879eb60
commit b9d97cff25
1 changed files with 28 additions and 9 deletions
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37
fs/btrfs/extent-tree.c
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@ -3329,11 +3329,38 @@ int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_ref *ref)
}
enum btrfs_loop_type {
/*
* Start caching block groups but do not wait for progress or for them
* to be done.
*/
LOOP_CACHING_NOWAIT,
/*
* Wait for the block group free_space >= the space we're waiting for if
* the block group isn't cached.
*/
LOOP_CACHING_WAIT,
/*
* Allow allocations to happen from block groups that do not yet have a
* size classification.
*/
LOOP_UNSET_SIZE_CLASS,
/*
* Allocate a chunk and then retry the allocation.
*/
LOOP_ALLOC_CHUNK,
/*
* Ignore the size class restrictions for this allocation.
*/
LOOP_WRONG_SIZE_CLASS,
/*
* Ignore the empty size, only try to allocate the number of bytes
* needed for this allocation.
*/
LOOP_NO_EMPTY_SIZE,
};
@ -3927,15 +3954,7 @@ static int find_free_extent_update_loop(struct btrfs_fs_info *fs_info,
if (ffe_ctl->index < BTRFS_NR_RAID_TYPES)
return 1;
/*
* LOOP_CACHING_NOWAIT, search partially cached block groups, kicking
* caching kthreads as we move along
* LOOP_CACHING_WAIT, search everything, and wait if our bg is caching
* LOOP_UNSET_SIZE_CLASS, allow unset size class
* LOOP_ALLOC_CHUNK, force a chunk allocation and try again
* LOOP_NO_EMPTY_SIZE, set empty_size and empty_cluster to 0 and try
* again
*/
/* See the comments for btrfs_loop_type for an explanation of the phases. */
if (ffe_ctl->loop < LOOP_NO_EMPTY_SIZE) {
ffe_ctl->index = 0;
/*