Commit 4e15f760 authored by Christian Brauner's avatar Christian Brauner Committed by Greg Kroah-Hartman
parent a319b01d
...@@ -152,6 +152,24 @@ static int devpts_ptmx_path(struct path *path) ...@@ -152,6 +152,24 @@ static int devpts_ptmx_path(struct path *path)
return 0; 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 vfsmount *devpts_mntget(struct file *filp, struct pts_fs_info *fsi)
{ {
struct path path; struct path path;
......
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