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btrfs: forbid deleting live subvol qgroup

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If a subvolume still exists, forbid deleting its qgroup 0/subvolid.
This behavior generally leads to incorrect behavior in squotas and
doesn't have a legitimate purpose.

Fixes: cecbb533b5 ("btrfs: record simple quota deltas in delayed refs")
CC: stable@vger.kernel.org # 5.4+
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Boris Burkov <boris@bur.io>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Boris Burkov 2024-01-10 17:30:00 -08:00 committed by David Sterba
parent 0c309d66da
commit a8df356199
1 changed files with 14 additions and 0 deletions
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14
fs/btrfs/qgroup.c
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@ -1736,6 +1736,15 @@ out:
return ret;
}
static bool qgroup_has_usage(struct btrfs_qgroup *qgroup)
{
return (qgroup->rfer > 0 || qgroup->rfer_cmpr > 0 ||
qgroup->excl > 0 || qgroup->excl_cmpr > 0 ||
qgroup->rsv.values[BTRFS_QGROUP_RSV_DATA] > 0 ||
qgroup->rsv.values[BTRFS_QGROUP_RSV_META_PREALLOC] > 0 ||
qgroup->rsv.values[BTRFS_QGROUP_RSV_META_PERTRANS] > 0);
}
int btrfs_remove_qgroup(struct btrfs_trans_handle *trans, u64 qgroupid)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
@ -1755,6 +1764,11 @@ int btrfs_remove_qgroup(struct btrfs_trans_handle *trans, u64 qgroupid)
goto out;
}
if (is_fstree(qgroupid) && qgroup_has_usage(qgroup)) {
ret = -EBUSY;
goto out;
}
/* Check if there are no children of this qgroup */
if (!list_empty(&qgroup->members)) {
ret = -EBUSY;