basic: add quota-util.[ch] with some helpers for the Linux quotactl() API

1 files changed, 41 insertions, 0 deletions

diff --git a/src/basic/quota-util.c b/src/basic/quota-util.c
new file mode 100644
index 0000000000..e048f5571f
--- /dev/null
+++ b/src/basic/quota-util.c
@@ -0,0 +1,41 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <sys/quota.h>
+
+#include "alloc-util.h"
+#include "blockdev-util.h"
+#include "quota-util.h"
+#include "stat-util.h"
+
+int quotactl_devno(int cmd, dev_t devno, int id, void *addr) {
+        _cleanup_free_ char *devnode = NULL;
+        int r;
+
+        /* Like quotactl() but takes a dev_t instead of a path to a device node, and fixes caddr_t → void*,
+         * like we should, today */
+
+        r = device_path_make_major_minor(S_IFBLK, devno, &devnode);
+        if (r < 0)
+                return r;
+
+        if (quotactl(cmd, devnode, id, addr) < 0)
+                return -errno;
+
+        return 0;
+}
+
+int quotactl_path(int cmd, const char *path, int id, void *addr) {
+        dev_t devno;
+        int r;
+
+        /* Like quotactl() but takes a path to some fs object, and changes the backing file system. I.e. the
+         * argument shouldn't be a block device but a regular file system object */
+
+        r = get_block_device(path, &devno);
+        if (r < 0)
+                return r;
+        if (devno == 0)
+                return -ENODEV;
+
+        return quotactl_devno(cmd, devno, id, addr);
+}