Commit a8b70c7f authored by Johannes Thumshirn's avatar Johannes Thumshirn Committed by David Sterba
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btrfs: zoned: don't skip block groups with 100% zone unusable 



Commit f4a9f219 ("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: f4a9f219 ("btrfs: do not delete unused block group if it may be used soon")
CC: stable@vger.kernel.org # 6.1+
Reviewed-by: default avatarFilipe Manana <fdmanana@suse.com>
Signed-off-by: default avatarJohannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 21334600

fs/btrfs/block-group.c

+2 −1
Original line number Diff line number Diff line
@@ -1559,7 +1559,8 @@ 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