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-rw-r--r--libbtrfsutil/qgroup.c83
1 files changed, 83 insertions, 0 deletions
diff --git a/libbtrfsutil/qgroup.c b/libbtrfsutil/qgroup.c
new file mode 100644
index 0000000..d291618
--- /dev/null
+++ b/libbtrfsutil/qgroup.c
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2018 Facebook
+ *
+ * This file is part of libbtrfsutil.
+ *
+ * libbtrfsutil is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * libbtrfsutil is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with libbtrfsutil. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <errno.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+#include <linux/btrfs.h>
+
+#include "btrfsutil_internal.h"
+
+PUBLIC enum btrfs_util_error btrfs_util_create_qgroup_inherit(int flags,
+ struct btrfs_util_qgroup_inherit **ret)
+{
+ struct btrfs_qgroup_inherit *inherit;
+
+ if (flags) {
+ errno = EINVAL;
+ return BTRFS_UTIL_ERROR_INVALID_ARGUMENT;
+ }
+
+ inherit = calloc(1, sizeof(*inherit));
+ if (!inherit)
+ return BTRFS_UTIL_ERROR_NO_MEMORY;
+
+ /*
+ * struct btrfs_util_qgroup_inherit is a lie; it's actually struct
+ * btrfs_qgroup_inherit, but we abstract it away so that users don't
+ * need to depend on the Btrfs UAPI headers.
+ */
+ *ret = (struct btrfs_util_qgroup_inherit *)inherit;
+
+ return BTRFS_UTIL_OK;
+}
+
+PUBLIC void btrfs_util_destroy_qgroup_inherit(struct btrfs_util_qgroup_inherit *inherit)
+{
+ free(inherit);
+}
+
+PUBLIC enum btrfs_util_error btrfs_util_qgroup_inherit_add_group(struct btrfs_util_qgroup_inherit **inherit,
+ uint64_t qgroupid)
+{
+ struct btrfs_qgroup_inherit *tmp = (struct btrfs_qgroup_inherit *)*inherit;
+
+ tmp = realloc(tmp, sizeof(*tmp) +
+ (tmp->num_qgroups + 1) * sizeof(tmp->qgroups[0]));
+ if (!tmp)
+ return BTRFS_UTIL_ERROR_NO_MEMORY;
+
+ tmp->qgroups[tmp->num_qgroups++] = qgroupid;
+
+ *inherit = (struct btrfs_util_qgroup_inherit *)tmp;
+
+ return BTRFS_UTIL_OK;
+}
+
+PUBLIC void btrfs_util_qgroup_inherit_get_groups(const struct btrfs_util_qgroup_inherit *inherit,
+ const uint64_t **groups,
+ size_t *n)
+{
+ struct btrfs_qgroup_inherit *tmp = (struct btrfs_qgroup_inherit *)inherit;
+
+ /* Need to cast because __u64 != uint64_t. */
+ *groups = (const uint64_t *)&tmp->qgroups[0];
+ *n = tmp->num_qgroups;
+}