This is a note to let you know that I've just added the patch titled
btrfs: zoned: don't skip block groups with 100% zone unusable
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
btrfs-zoned-don-t-skip-block-groups-with-100-zone-unusable.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a8b70c7f8600bc77d03c0b032c0662259b9e615e Mon Sep 17 00:00:00 2001
From: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
Date: Wed, 21 Feb 2024 07:35:52 -0800
Subject: btrfs: zoned: don't skip block groups with 100% zone unusable
From: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
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@xxxxxxxxxxxxxxx # 6.1+
Reviewed-by: Filipe Manana <fdmanana@xxxxxxxx>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
Reviewed-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/btrfs/block-group.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/fs/btrfs/block-group.c
+++ b/fs/btrfs/block-group.c
@@ -1562,7 +1562,8 @@ void btrfs_delete_unused_bgs(struct btrf
* 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
Patches currently in stable-queue which might be from johannes.thumshirn@xxxxxxx are
queue-6.6/btrfs-zoned-don-t-skip-block-groups-with-100-zone-unusable.patch
queue-6.6/btrfs-zoned-use-zone-aware-sb-location-for-scrub.patch
