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 btrfs. 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>
---
fs/btrfs/space-info.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/fs/btrfs/space-info.c b/fs/btrfs/space-info.c
index b970909c0820..7183a8dc9b34 100644
--- a/fs/btrfs/space-info.c
+++ b/fs/btrfs/space-info.c
@@ -399,7 +399,10 @@ 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 < writable_total_bytes(fs_info, space_info) + avail)
return 1;
--
2.35.1
