Merge tag 'pull-fs_context' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull fs_context updates from Al Viro:
 "Change vfs_parse_fs_string() calling conventions

  Get rid of the length argument (almost all callers pass strlen() of
  the string argument there), add vfs_parse_fs_qstr() for the cases that
  do want separate length"

* tag 'pull-fs_context' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  do_nfs4_mount(): switch to vfs_parse_fs_string()
  change the calling conventions for vfs_parse_fs_string()

Documentation/filesystems/mount_api.rst

@@ -504,10 +504,18 @@ returned.
      clear the pointer, but then becomes responsible for disposing of the
      object.
 
+   * ::
+
+       int vfs_parse_fs_qstr(struct fs_context *fc, const char *key,
+			       const struct qstr *value);
+
+     A wrapper around vfs_parse_fs_param() that copies the value string it is
+     passed.
+
    * ::
 
        int vfs_parse_fs_string(struct fs_context *fc, const char *key,
-			       const char *value, size_t v_size);
+			       const char *value);
 
      A wrapper around vfs_parse_fs_param() that copies the value string it is
      passed.

Documentation/filesystems/porting.rst

@@ -1297,3 +1297,15 @@ Several functions are renamed:
 -  user_path_create -> start_creating_user_path
 -  user_path_locked_at -> start_removing_user_path_at
 -  done_path_create -> end_creating_path
+
+---
+
+**mandatory**
+
+Calling conventions for vfs_parse_fs_string() have changed; it does *not*
+take length anymore (value ? strlen(value) : 0 is used).  If you want
+a different length, use
+
+	vfs_parse_fs_qstr(fc, key, &QSTR_LEN(value, len))
+
+instead.