import: drop logic of setting up /var/lib/machines as btrfs loopback mount

[thirdparty/systemd.git] / src / basic / btrfs-util.c

diff --git a/src/basic/btrfs-util.c b/src/basic/btrfs-util.c
index 3252b75802251a7bd2450e433f1eac3bb27d0fb2..cedce84e9ce67d1500c63639d1b78be84a410c78 100644 (file)
--- a/src/basic/btrfs-util.c
+++ b/src/basic/btrfs-util.c
@@ -870,96 +870,6 @@ int btrfs_subvol_set_subtree_quota_limit(const char *path, uint64_t subvol_id, u
         return btrfs_subvol_set_subtree_quota_limit_fd(fd, subvol_id, referenced_max);
 }
 
-int btrfs_resize_loopback_fd(int fd, uint64_t new_size, bool grow_only) {
-        struct btrfs_ioctl_vol_args args = {};
-        char p[SYS_BLOCK_PATH_MAX("/loop/backing_file")], q[DEV_NUM_PATH_MAX];
-        _cleanup_free_ char *backing = NULL;
-        _cleanup_close_ int loop_fd = -1, backing_fd = -1;
-        struct stat st;
-        dev_t dev = 0;
-        int r;
-
-        /* In contrast to btrfs quota ioctls ftruncate() cannot make sense of "infinity" or file sizes > 2^31 */
-        if (!FILE_SIZE_VALID(new_size))
-                return -EINVAL;
-
-        /* btrfs cannot handle file systems < 16M, hence use this as minimum */
-        if (new_size < 16*1024*1024)
-                new_size = 16*1024*1024;
-
-        r = btrfs_get_block_device_fd(fd, &dev);
-        if (r < 0)
-                return r;
-        if (r == 0)
-                return -ENODEV;
-
-        xsprintf_sys_block_path(p, "/loop/backing_file", dev);
-        r = read_one_line_file(p, &backing);
-        if (r == -ENOENT)
-                return -ENODEV;
-        if (r < 0)
-                return r;
-        if (isempty(backing) || !path_is_absolute(backing))
-                return -ENODEV;
-
-        backing_fd = open(backing, O_RDWR|O_CLOEXEC|O_NOCTTY);
-        if (backing_fd < 0)
-                return -errno;
-
-        if (fstat(backing_fd, &st) < 0)
-                return -errno;
-        if (!S_ISREG(st.st_mode))
-                return -ENODEV;
-
-        if (new_size == (uint64_t) st.st_size)
-                return 0;
-
-        if (grow_only && new_size < (uint64_t) st.st_size)
-                return -EINVAL;
-
-        xsprintf_dev_num_path(q, "block", dev);
-        loop_fd = open(q, O_RDWR|O_CLOEXEC|O_NOCTTY);
-        if (loop_fd < 0)
-                return -errno;
-
-        if (snprintf(args.name, sizeof(args.name), "%" PRIu64, new_size) >= (int) sizeof(args.name))
-                return -EINVAL;
-
-        if (new_size < (uint64_t) st.st_size) {
-                /* Decrease size: first decrease btrfs size, then shorten loopback */
-                if (ioctl(fd, BTRFS_IOC_RESIZE, &args) < 0)
-                        return -errno;
-        }
-
-        if (ftruncate(backing_fd, new_size) < 0)
-                return -errno;
-
-        if (ioctl(loop_fd, LOOP_SET_CAPACITY, 0) < 0)
-                return -errno;
-
-        if (new_size > (uint64_t) st.st_size) {
-                /* Increase size: first enlarge loopback, then increase btrfs size */
-                if (ioctl(fd, BTRFS_IOC_RESIZE, &args) < 0)
-                        return -errno;
-        }
-
-        /* Make sure the free disk space is correctly updated for both file systems */
-        (void) fsync(fd);
-        (void) fsync(backing_fd);
-
-        return 1;
-}
-
-int btrfs_resize_loopback(const char *p, uint64_t new_size, bool grow_only) {
-        _cleanup_close_ int fd = -1;
-
-        fd = open(p, O_RDONLY|O_NOCTTY|O_CLOEXEC);
-        if (fd < 0)
-                return -errno;
-
-        return btrfs_resize_loopback_fd(fd, new_size, grow_only);
-}
-
 int btrfs_qgroupid_make(uint64_t level, uint64_t id, uint64_t *ret) {
         assert(ret);