@@ -31,6 +31,12 @@ help.
NOTE: Since *chunk-recover* will scan the whole device, it will be *VERY* slow
especially executed on a large device.
+*disable-quota* <device>::
+disable quota offline
++
+Acts as a fallback method to disable quota for case where mount hangs due to
+balance and quota.
+
*fix-device-size* <device>::
fix device size and super block total bytes values that are do not match
+
@@ -250,6 +250,84 @@ out:
return !!ret;
}
+static const char * const cmd_rescue_disable_quota_usage[] = {
+ "btrfs rescue disable-quota <device>",
+ "Disable quota, especially useful for balance mount hang when quota enabled",
+ "",
+ NULL
+};
+
+static int cmd_rescue_disable_quota(int argc, char **argv)
+{
+ struct btrfs_trans_handle *trans;
+ struct btrfs_fs_info *fs_info;
+ struct btrfs_path path;
+ struct btrfs_root *root;
+ struct btrfs_qgroup_status_item *qi;
+ struct btrfs_key key;
+ char *devname;
+ int ret;
+
+ clean_args_no_options(argc, argv, cmd_rescue_disable_quota_usage);
+ if (check_argc_exact(argc, 2))
+ usage(cmd_rescue_disable_quota_usage);
+
+ devname = argv[optind];
+ ret = check_mounted(devname);
+ if (ret < 0) {
+ error("could not check mount status: %s", strerror(-ret));
+ return !!ret;
+ } else if (ret) {
+ error("%s is currently mounted", devname);
+ return !!ret;
+ }
+ fs_info = open_ctree_fs_info(devname, 0, 0, 0, OPEN_CTREE_WRITES);
+ if (!fs_info) {
+ error("could not open btrfs");
+ ret = -EIO;
+ return !!ret;
+ }
+ root = fs_info->quota_root;
+ if (!root) {
+ printf("Quota is not enabled, no need to modify the fs\n");
+ goto close;
+ }
+ btrfs_init_path(&path);
+ trans = btrfs_start_transaction(root, 1);
+ if (IS_ERR(trans)) {
+ ret = PTR_ERR(trans);
+ error("failed to start transaction: %s", strerror(-ret));
+ goto close;
+ }
+ key.objectid = 0;
+ key.type = BTRFS_QGROUP_STATUS_KEY;
+ key.offset = 0;
+ ret = btrfs_search_slot(trans, root, &key, &path, 0, 1);
+ if (ret < 0) {
+ error("failed to search tree: %s", strerror(-ret));
+ goto close;
+ }
+ if (ret > 0) {
+ printf(
+ "Qgroup status item not found, no need to modify the fs\n");
+ ret = 0;
+ goto release;
+ }
+ qi = btrfs_item_ptr(path.nodes[0], path.slots[0],
+ struct btrfs_qgroup_status_item);
+ btrfs_set_qgroup_status_flags(path.nodes[0], qi,
+ BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT);
+ btrfs_mark_buffer_dirty(path.nodes[0]);
+ ret = btrfs_commit_transaction(trans, root);
+ if (ret < 0)
+ error("failed to commit transaction: %s", strerror(-ret));
+release:
+ btrfs_release_path(&path);
+close:
+ close_ctree(fs_info->tree_root);
+ return !!ret;
+}
+
static const char rescue_cmd_group_info[] =
"toolbox for specific rescue operations";
@@ -262,6 +340,8 @@ const struct cmd_group rescue_cmd_group = {
{ "zero-log", cmd_rescue_zero_log, cmd_rescue_zero_log_usage, NULL, 0},
{ "fix-device-size", cmd_rescue_fix_device_size,
cmd_rescue_fix_device_size_usage, NULL, 0},
+ { "disable-quota", cmd_rescue_disable_quota,
+ cmd_rescue_disable_quota_usage, NULL, 0},
NULL_CMD_STRUCT
}
};