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-rw-r--r--fs/devpts/inode.c26
1 files changed, 16 insertions, 10 deletions
diff --git a/fs/devpts/inode.c b/fs/devpts/inode.c
index 71b901936113..542364bf923e 100644
--- a/fs/devpts/inode.c
+++ b/fs/devpts/inode.c
@@ -160,21 +160,27 @@ struct vfsmount *devpts_mntget(struct file *filp, struct pts_fs_info *fsi)
path = filp->f_path;
path_get(&path);
- /* Has the devpts filesystem already been found? */
- if (path.mnt->mnt_sb->s_magic != DEVPTS_SUPER_MAGIC)
+ /* Walk upward while the start point is a bind mount of
+ * a single file.
+ */
+ while (path.mnt->mnt_root == path.dentry)
+ if (follow_up(&path) == 0)
+ break;
+
+ /* devpts_ptmx_path() finds a devpts fs or returns an error. */
+ if ((path.mnt->mnt_sb->s_magic != DEVPTS_SUPER_MAGIC) ||
+ (DEVPTS_SB(path.mnt->mnt_sb) != fsi))
err = devpts_ptmx_path(&path);
dput(path.dentry);
- if (err) {
- mntput(path.mnt);
- return ERR_PTR(err);
- }
+ if (!err) {
+ if (DEVPTS_SB(path.mnt->mnt_sb) == fsi)
+ return path.mnt;
- if (DEVPTS_SB(path.mnt->mnt_sb) != fsi) {
- mntput(path.mnt);
- return ERR_PTR(-ENODEV);
+ err = -ENODEV;
}
- return path.mnt;
+ mntput(path.mnt);
+ return ERR_PTR(err);
}
struct pts_fs_info *devpts_acquire(struct file *filp)