mount_utils: kill mount_from_at()

src/lxc/mount_utils.c

@@ -255,55 +255,6 @@ int fs_attach(int fd_fs,
 	return 0;
 }
 
-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,
-		  __u64 o_flags_to,
-		  __u64 resolve_flags_to,
-		  const char *fstype, unsigned int mnt_flags, const void *data)
-{
-	__do_close int fd_from = -EBADF, fd_to = -EBADF;
-	struct lxc_open_how how = {};
-	int ret;
-	char src_buf[LXC_PROC_PID_FD_LEN], dst_buf[LXC_PROC_PID_FD_LEN];
-
-	if (is_empty_string(path_from)) {
-		ret = snprintf(src_buf, sizeof(src_buf), "/proc/self/fd/%d", dfd_from);
-	} else {
-		how.flags	= o_flags_from;
-		how.resolve	= resolve_flags_from;
-		fd_from = openat2(dfd_from, path_from, &how, sizeof(how));
-		if (fd_from < 0)
-			return -errno;
-
-		ret = snprintf(src_buf, sizeof(src_buf), "/proc/self/fd/%d", fd_from);
-	}
-	if (ret < 0 || ret >= sizeof(src_buf))
-		return -EIO;
-
-	if (is_empty_string(path_to)) {
-		ret = snprintf(dst_buf, sizeof(dst_buf), "/proc/self/fd/%d", dfd_to);
-	} else {
-		how.flags	= o_flags_to;
-		how.resolve	= resolve_flags_to;
-		fd_to = openat2(dfd_to, path_to, &how, sizeof(how));
-		if (fd_to < 0)
-			return -errno;
-
-		ret = snprintf(dst_buf, sizeof(dst_buf), "/proc/self/fd/%d", fd_to);
-	}
-	if (ret < 0 || ret >= sizeof(src_buf))
-		return -EIO;
-
-	if (is_empty_string(src_buf))
-		ret = mount(NULL, dst_buf, fstype, mnt_flags, data);
-	else
-		ret = mount(src_buf, dst_buf, fstype, mnt_flags, data);
-
-	return ret;
-}
-
 int fd_bind_mount(int dfd_from, const char *path_from,
 		  __u64 o_flags_from, __u64 resolve_flags_from,
 		  int dfd_to, const char *path_to,

src/lxc/mount_utils.h

@@ -157,12 +157,6 @@ __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_from_at(int dfd_from, const char *path_from,
-				  __u64 o_flags_from, __u64 resolve_flags_from,
-				  int dfd_to, const char *path_to,
-				  __u64 o_flags_to, __u64 resolve_flags_to,
-				  const char *fstype, unsigned int mnt_flags,
-				  const void *data);
 __hidden extern int fs_prepare(const char *fs_name, int dfd_from,
 			       const char *path_from, __u64 o_flags_from,
 			       __u64 resolve_flags_from);