introduce kern_path_mountpoint()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/namei.c b/fs/namei.c
index 11184df..e412421 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2360,6 +2360,20 @@
return err;
}
+static int
+filename_mountpoint(int dfd, struct filename *s, struct path *path,
+ unsigned int flags)
+{
+ int error = path_mountpoint(dfd, s->name, path, flags | LOOKUP_RCU);
+ if (unlikely(error == -ECHILD))
+ error = path_mountpoint(dfd, s->name, path, flags);
+ if (unlikely(error == -ESTALE))
+ error = path_mountpoint(dfd, s->name, path, flags | LOOKUP_REVAL);
+ if (likely(!error))
+ audit_inode(s, path->dentry, 0);
+ return error;
+}
+
/**
* user_path_mountpoint_at - lookup a path from userland in order to umount it
* @dfd: directory file descriptor
@@ -2380,23 +2394,22 @@
{
struct filename *s = getname(name);
int error;
-
if (IS_ERR(s))
return PTR_ERR(s);
-
- error = path_mountpoint(dfd, s->name, path, flags | LOOKUP_RCU);
- if (unlikely(error == -ECHILD))
- error = path_mountpoint(dfd, s->name, path, flags);
- if (unlikely(error == -ESTALE))
- error = path_mountpoint(dfd, s->name, path, flags | LOOKUP_REVAL);
-
- if (likely(!error))
- audit_inode(s, path->dentry, 0);
-
+ error = filename_mountpoint(dfd, s, path, flags);
putname(s);
return error;
}
+int
+kern_path_mountpoint(int dfd, const char *name, struct path *path,
+ unsigned int flags)
+{
+ struct filename s = {.name = name};
+ return filename_mountpoint(dfd, &s, path, flags);
+}
+EXPORT_SYMBOL(kern_path_mountpoint);
+
/*
* It's inline, so penalty for filesystems that don't use sticky bit is
* minimal.