Unverified Commit 0ff053b9 authored Feb 10, 2025 by Christian Brauner

fs: support O_PATH fds with FSCONFIG_SET_FD

Let FSCONFIG_SET_FD handle O_PATH file descriptors. This is particularly
useful in the context of overlayfs where layers can be specified via
file descriptors instead of paths. But userspace must currently use
non-O_PATH file desriptors which is often pointless especially if
the file descriptors have been created via open_tree(OPEN_TREE_CLONE).

Link: https://lore.kernel.org/r/20250210-work-overlayfs-v2-1-ed2a949b674b@kernel.org

Fixes: a08557d1 ("ovl: specify layers via file descriptors")
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>

parent 2cc0b7fd

fs/autofs/autofs_i.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -218,6 +218,8 @@ void autofs_clean_ino(struct autofs_info *);

		static inline int autofs_check_pipe(struct file *pipe)
		{
		if (pipe->f_mode & FMODE_PATH)
		return -EINVAL;
		if (!(pipe->f_mode & FMODE_CAN_WRITE))
		return -EINVAL;
		if (!S_ISFIFO(file_inode(pipe)->i_mode))

+1 −1