btrfs-util: introduce btrfs_subvol_make_fd()

diff --git a/src/basic/btrfs-util.c b/src/basic/btrfs-util.c
index efac0b94207f677ac4a4613736ead775325bacaf..abd34824e7d047ea990b8de011124d19d1f5d1c2 100644 (file)
--- a/src/basic/btrfs-util.c
+++ b/src/basic/btrfs-util.c
@@ -116,8 +116,25 @@ int btrfs_is_subvol(const char *path) {
         return btrfs_is_subvol_fd(fd);
 }
 
-int btrfs_subvol_make(const char *path) {
+int btrfs_subvol_make_fd(int fd, const char *subvolume) {
         struct btrfs_ioctl_vol_args args = {};
+        int r;
+
+        assert(subvolume);
+
+        r = validate_subvolume_name(subvolume);
+        if (r < 0)
+                return r;
+
+        strncpy(args.name, subvolume, sizeof(args.name)-1);
+
+        if (ioctl(fd, BTRFS_IOC_SUBVOL_CREATE, &args) < 0)
+                return -errno;
+
+        return 0;
+}
+
+int btrfs_subvol_make(const char *path) {
         _cleanup_close_ int fd = -1;
         const char *subvolume;
         int r;
@@ -132,12 +149,7 @@ int btrfs_subvol_make(const char *path) {
         if (fd < 0)
                 return fd;
 
-        strncpy(args.name, subvolume, sizeof(args.name)-1);
-
-        if (ioctl(fd, BTRFS_IOC_SUBVOL_CREATE, &args) < 0)
-                return -errno;
-
-        return 0;
+        return btrfs_subvol_make_fd(fd, subvolume);
 }
 
 int btrfs_subvol_set_read_only_fd(int fd, bool b) {

diff --git a/src/basic/btrfs-util.h b/src/basic/btrfs-util.h
index a594387b5a96f5cd052fb857ad08018895313da5..b0cf6739f7755b77fd53ef5b6740a494d67f4794 100644 (file)
--- a/src/basic/btrfs-util.h
+++ b/src/basic/btrfs-util.h
@@ -65,6 +65,7 @@ int btrfs_resize_loopback_fd(int fd, uint64_t size, bool grow_only);
 int btrfs_resize_loopback(const char *path, uint64_t size, bool grow_only);
 
 int btrfs_subvol_make(const char *path);
+int btrfs_subvol_make_fd(int fd, const char *subvolume);
 
 int btrfs_subvol_snapshot_fd(int old_fd, const char *new_path, BtrfsSnapshotFlags flags);
 int btrfs_subvol_snapshot(const char *old_path, const char *new_path, BtrfsSnapshotFlags flags);