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btrfs: zoned: don't skip block groups with 100% zone unusable 

commit a8b70c7f8600bc77d03c0b032c0662259b9e615e upstream.

Commit f4a9f219411f ("btrfs: do not delete unused block group if it may be
used soon") changed the behaviour of deleting unused block-groups on zoned
filesystems. Starting with this commit, we're using
btrfs_space_info_used() to calculate the number of used bytes in a
space_info. But btrfs_space_info_used() also accounts
btrfs_space_info::bytes_zone_unusable as used bytes.

So if a block group is 100% zone_unusable it is skipped from the deletion
step.

In order not to skip fully zone_unusable block-groups, also check if the
block-group has bytes left that can be used on a zoned filesystem.

Fixes: f4a9f219411f ("btrfs: do not delete unused block group if it may be used soon")
CC: stable@vger.kernel.org # 6.1+
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johannes Thumshirn 2024-02-21 07:35:52 -08:00 committed by Greg Kroah-Hartman
parent 0427c8ef8b
commit 7b5029e3f1
1 changed files with 2 additions and 1 deletions
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3
fs/btrfs/block-group.c
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@ -1562,7 +1562,8 @@ void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info)
* needing to allocate extents from the block group.
*/
used = btrfs_space_info_used(space_info, true);
if (space_info->total_bytes - block_group->length < used) {
if (space_info->total_bytes - block_group->length < used &&
block_group->zone_unusable < block_group->length) {
/*
* Add a reference for the list, compensate for the ref
* drop under the "next" label for the