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Commit 4e15f760 authored by Christian Brauner's avatar Christian Brauner Committed by Greg Kroah-Hartman
Browse files

devpts: comment devpts_mntget() 



Signed-off-by: default avatarChristian Brauner <christian.brauner@ubuntu.com>
Acked-by: default avatar"Eric W. Biederman" <ebiederm@xmission.com>
Acked-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent a319b01d

fs/devpts/inode.c

+18 −0
Original line number Diff line number Diff line
@@ -152,6 +152,24 @@ static int devpts_ptmx_path(struct path *path) 
	return 0;

}



/*

 * Try to find a suitable devpts filesystem. We support the following

 * scenarios:

 * - The ptmx device node is located in the same directory as the devpts

 *   mount where the pts device nodes are located.

 *   This is e.g. the case when calling open on the /dev/pts/ptmx device

 *   node when the devpts filesystem is mounted at /dev/pts.

 * - The ptmx device node is located outside the devpts filesystem mount

 *   where the pts device nodes are located. For example, the ptmx device

 *   is a symlink, separate device node, or bind-mount.

 *   A supported scenario is bind-mounting /dev/pts/ptmx to /dev/ptmx and

 *   then calling open on /dev/ptmx. In this case a suitable pts

 *   subdirectory can be found in the common parent directory /dev of the

 *   devpts mount and the ptmx bind-mount, after resolving the /dev/ptmx

 *   bind-mount.

 *   If no suitable pts subdirectory can be found this function will fail.

 *   This is e.g. the case when bind-mounting /dev/pts/ptmx to /ptmx.

 */

struct vfsmount *devpts_mntget(struct file *filp, struct pts_fs_info *fsi)

{

	struct path path;