return 0;
}
-int btrfs_is_snapshot(int fd) {
- struct stat st;
+int btrfs_is_filesystem(int fd) {
struct statfs sfs;
+ assert(fd >= 0);
+
+ if (fstatfs(fd, &sfs) < 0)
+ return -errno;
+
+ return F_TYPE_EQUAL(sfs.f_type, BTRFS_SUPER_MAGIC);
+}
+
+int btrfs_is_subvol(int fd) {
+ struct stat st;
+
+ assert(fd >= 0);
+
/* On btrfs subvolumes always have the inode 256 */
if (fstat(fd, &st) < 0)
if (!S_ISDIR(st.st_mode) || st.st_ino != 256)
return 0;
- if (fstatfs(fd, &sfs) < 0)
- return -errno;
-
- return F_TYPE_EQUAL(sfs.f_type, BTRFS_SUPER_MAGIC);
+ return btrfs_is_filesystem(fd);
}
int btrfs_subvol_make(const char *path) {
assert(old_fd >= 0);
assert(new_path);
- r = btrfs_is_snapshot(old_fd);
+ r = btrfs_is_subvol(old_fd);
if (r < 0)
return r;
if (r == 0) {
BTRFS_SNAPSHOT_RECURSIVE = 4,
} BtrfsSnapshotFlags;
-int btrfs_is_snapshot(int fd);
+int btrfs_is_filesystem(int fd);
+int btrfs_is_subvol(int fd);
int btrfs_subvol_make(const char *path);
int btrfs_subvol_make_label(const char *path);
/* btrfs subvolumes have inode 256 */
if (st.st_ino == 256) {
- struct statfs sfs;
- if (fstatfs(fd, &sfs) < 0)
- return -errno;
-
- if (F_TYPE_EQUAL(sfs.f_type, BTRFS_SUPER_MAGIC)) {
+ r = btrfs_is_filesystem(fd);
+ if (r < 0)
+ return r;
+ if (r) {
BtrfsSubvolInfo info;
BtrfsQuotaInfo quota;