This is a note to let you know that I've just added the patch titled
btrfs: zoned: disable metadata overcommit for zoned
to the 5.18-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-disable-metadata-overcommit-for-zoned.patch
and it can be found in the queue-5.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 28f8ac17eaf7d79fae9a491d13a968e609237c54
Author: Naohiro Aota <naohiro.aota@xxxxxxx>
Date: Sat Jul 9 08:18:46 2022 +0900
btrfs: zoned: disable metadata overcommit for zoned
[ Upstream commit 79417d040f4f77b19c701bccc23013b9cdac358d ]
The metadata overcommit makes the space reservation flexible but it is also
harmful to active zone tracking. Since we cannot finish a block group from
the metadata allocation context, we might not activate a new block group
and might not be able to actually write out the overcommit reservations.
So, disable metadata overcommit for zoned filesystems. We will ensure
the reservations are under active_total_bytes in the following patches.
CC: stable@xxxxxxxxxxxxxxx # 5.16+
Fixes: afba2bc036b0 ("btrfs: zoned: implement active zone tracking")
Signed-off-by: Naohiro Aota <naohiro.aota@xxxxxxx>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/btrfs/space-info.c b/fs/btrfs/space-info.c
index b87931a458eb..56a7c99fc03e 100644
--- a/fs/btrfs/space-info.c
+++ b/fs/btrfs/space-info.c
@@ -340,7 +340,10 @@ int btrfs_can_overcommit(struct btrfs_fs_info *fs_info,
return 0;
used = btrfs_space_info_used(space_info, true);
- avail = calc_available_free_space(fs_info, space_info, flush);
+ if (btrfs_is_zoned(fs_info) && (space_info->flags & BTRFS_BLOCK_GROUP_METADATA))
+ avail = 0;
+ else
+ avail = calc_available_free_space(fs_info, space_info, flush);
if (used + bytes < space_info->total_bytes + avail)
return 1;
