diff options
Diffstat (limited to 'fs/btrfs/sysfs.c')
| -rw-r--r-- | fs/btrfs/sysfs.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c index 736d81d911f9..699b54b3acaa 100644 --- a/fs/btrfs/sysfs.c +++ b/fs/btrfs/sysfs.c @@ -2045,6 +2045,44 @@ static ssize_t qgroup_inconsistent_show(struct kobject *qgroups_kobj, } BTRFS_ATTR(qgroups, inconsistent, qgroup_inconsistent_show); +static ssize_t qgroup_drop_subtree_thres_show(struct kobject *qgroups_kobj, + struct kobj_attribute *a, + char *buf) +{ + struct btrfs_fs_info *fs_info = to_fs_info(qgroups_kobj->parent); + u8 result; + + spin_lock(&fs_info->qgroup_lock); + result = fs_info->qgroup_drop_subtree_thres; + spin_unlock(&fs_info->qgroup_lock); + + return sysfs_emit(buf, "%d\n", result); +} + +static ssize_t qgroup_drop_subtree_thres_store(struct kobject *qgroups_kobj, + struct kobj_attribute *a, + const char *buf, size_t len) +{ + struct btrfs_fs_info *fs_info = to_fs_info(qgroups_kobj->parent); + u8 new_thres; + int ret; + + ret = kstrtou8(buf, 10, &new_thres); + if (ret) + return -EINVAL; + + if (new_thres > BTRFS_MAX_LEVEL) + return -EINVAL; + + spin_lock(&fs_info->qgroup_lock); + fs_info->qgroup_drop_subtree_thres = new_thres; + spin_unlock(&fs_info->qgroup_lock); + + return len; +} +BTRFS_ATTR_RW(qgroups, drop_subtree_threshold, qgroup_drop_subtree_thres_show, + qgroup_drop_subtree_thres_store); + /* * Qgroups global info * @@ -2053,6 +2091,7 @@ BTRFS_ATTR(qgroups, inconsistent, qgroup_inconsistent_show); static struct attribute *qgroups_attrs[] = { BTRFS_ATTR_PTR(qgroups, enabled), BTRFS_ATTR_PTR(qgroups, inconsistent), + BTRFS_ATTR_PTR(qgroups, drop_subtree_threshold), NULL }; ATTRIBUTE_GROUPS(qgroups); |