mount_utils: kill mount_at()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

src/lxc/mount_utils.c

@@ -139,61 +139,6 @@ int mount_filesystem(const char *fs_name, const char *path, unsigned int attr_fl
 	return mount("none", path, fs_name, old_flags, NULL);
 }
 
-int mount_at(int dfd,
-	     const char *src_under_dfd,
-	     const char *dst_under_dfd,
-	     __u64 o_flags,
-	     __u64 resolve_flags,
-	     const char *fstype,
-	     unsigned int mnt_flags,
-	     const void *data)
-{
-	__do_close int source_fd = -EBADF, target_fd = -EBADF;
-	struct lxc_open_how how = {
-		.flags		= o_flags,
-		.resolve	= resolve_flags,
-	};
-	int ret;
-	char src_buf[LXC_PROC_PID_FD_LEN], dst_buf[LXC_PROC_PID_FD_LEN];
-
-	if (dfd < 0)
-		return ret_errno(EINVAL);
-
-	if (!is_empty_string(src_buf) && *src_buf == '/')
-		return log_error_errno(-EINVAL, EINVAL, "Absolute path specified");
-
-	if (!is_empty_string(src_under_dfd)) {
-		source_fd = openat2(dfd, src_under_dfd, &how, sizeof(how));
-		if (source_fd < 0)
-			return -errno;
-
-		ret = snprintf(src_buf, sizeof(src_buf), "/proc/self/fd/%d", source_fd);
-		if (ret < 0 || ret >= sizeof(src_buf))
-			return -EIO;
-	}
-
-	if (!is_empty_string(dst_under_dfd)) {
-		target_fd = openat2(dfd, dst_under_dfd, &how, sizeof(how));
-		if (target_fd < 0)
-			return log_error_errno(-errno, errno, "Failed to open %d(%s)", dfd, dst_under_dfd);
-
-		TRACE("Mounting %d(%s) through /proc/self/fd/%d", target_fd, dst_under_dfd, target_fd);
-		ret = snprintf(dst_buf, sizeof(dst_buf), "/proc/self/fd/%d", target_fd);
-	} else {
-		TRACE("Mounting %d through /proc/self/fd/%d", dfd, dfd);
-		ret = snprintf(dst_buf, sizeof(dst_buf), "/proc/self/fd/%d", dfd);
-	}
-	if (ret < 0 || ret >= sizeof(dst_buf))
-		return -EIO;
-
-	if (!is_empty_string(src_buf))
-		ret = mount(src_buf, dst_buf, fstype, mnt_flags, data);
-	else
-		ret = mount(NULL, dst_buf, fstype, mnt_flags, data);
-
-	return ret;
-}
-
 static int __fs_prepare(const char *fs_name, int fd_from)
 {
 	__do_close int fd_fs = -EBADF;

src/lxc/mount_utils.h

@@ -152,11 +152,6 @@ __hidden extern int mnt_attributes_old(unsigned int new_flags, unsigned int *old
 
 __hidden extern int mount_filesystem(const char *fs_name, const char *path, unsigned int attr_flags);
 
-__hidden extern int mount_at(int dfd, const char *src_under_dfd,
-			     const char *dst_under_dfd, __u64 o_flags,
-			     __u64 resolve_flags, const char *fstype,
-			     unsigned int mnt_flags, const void *data);
-
 __hidden extern int mount_from_at(int dfd_from, const char *path_from,
 				  __u64 o_flags_from, __u64 resolve_flags_from,
 				  int dfd_to, const char *path_to,