devtmpfs: restore mount option reconfiguration on get_tree

commit cb0e0a8bf4e1 ("devtmpfs: replace ->mount with ->get_tree in
public instance") converted the public devtmpfs instance to the new
mount API but broke the ability to reconfigure the shared superblock
options via subsequent mount() calls, as had been fixed once in
a6097180d884 ("devtmpfs regression fix: reconfigure on each mount")

This makes boot-time defaults permanent.

Fix this using an approach suggested by Al Viro: at init_fs_context
time, create a reconfigure-mode context via fs_context_for_reconfigure()
and save it in fc->fs_private. The devtmpfs parse ops can then use
this context to parse options appropriately for the underlying filesystem.

This also removes the devtmpfs_configure_context() one-time ops-copying
approach and the global mutable ops table it required.

Fixes: cb0e0a8bf4e1 ("devtmpfs: replace ->mount with ->get_tree in public instance")
Reported-by: Simon Liebold <simonlie@amazon.de>
Cc: stable@vger.kernel.org
Suggested-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Link: https://patch.msgid.link/b1bd3b15-78ea-4487-b6a8-aad0b05dd3bb@redhat.com
Tested-by: Simon Liebold <simonlie@amazon.de>
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

0 files changed, 0 insertions, 0 deletions