shaba/systemd
1
0
Fork 0
mirror of https://github.com/systemd/systemd.git synced 2025-01-11 09:18:07 +03:00
Code

btrfs-util: Add btrfs_is_subvol_at()

Browse Source
This commit is contained in:
Daan De Meyer 2023-06-01 13:58:29 +02:00
parent b196e17ed4
commit 6d2fd8df0a
2 changed files with 11 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
src/shared/btrfs-util.c
View File

@ -70,32 +70,20 @@ static int extract_subvolume_name(const char *path, char **ret) {
return 0;
}
int btrfs_is_subvol_fd(int fd) {
int btrfs_is_subvol_at(int dir_fd, const char *path) {
struct stat st;
assert(fd >= 0);
assert(dir_fd >= 0 || dir_fd == AT_FDCWD);
/* On btrfs subvolumes always have the inode 256 */
if (fstat(fd, &st) < 0)
if (fstatat(dir_fd, strempty(path), &st, (isempty(path) ? AT_EMPTY_PATH : 0)) < 0)
return -errno;
if (!btrfs_might_be_subvol(&st))
return 0;
return fd_is_fs_type(fd, BTRFS_SUPER_MAGIC);
}
int btrfs_is_subvol(const char *path) {
_cleanup_close_ int fd = -EBADF;
assert(path);
fd = open(path, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
if (fd < 0)
return -errno;
return btrfs_is_subvol_fd(fd);
return is_fs_type_at(dir_fd, path, BTRFS_SUPER_MAGIC);
}
int btrfs_subvol_make_fd(int fd, const char *subvolume) {

9
src/shared/btrfs-util.h
View File

@ -43,8 +43,13 @@ typedef enum BtrfsRemoveFlags {
BTRFS_REMOVE_QUOTA = 1 << 1,
} BtrfsRemoveFlags;
int btrfs_is_subvol_fd(int fd);
int btrfs_is_subvol(const char *path);
int btrfs_is_subvol_at(int dir_fd, const char *path);
static inline int btrfs_is_subvol_fd(int fd) {
return btrfs_is_subvol_at(fd, NULL);
}
static inline int btrfs_is_subvol(const char *path) {
return btrfs_is_subvol_at(AT_FDCWD, path);
}
int btrfs_get_block_device_at(int dir_fd, const char *path, dev_t *ret);
static inline int btrfs_get_block_device(const char *path, dev_t *ret) {