SMB3: force unmount was failing to close deferred close files
authorSteve French <stfrench@microsoft.com>
Tue, 9 May 2023 06:00:42 +0000 (01:00 -0500)
committerSteve French <stfrench@microsoft.com>
Tue, 9 May 2023 14:53:59 +0000 (09:53 -0500)
commit2cb6f968775a9fd60c90a6042b9550bcec3ea087
tree10f0f2bbe212d6ffc46d45db749d6c01c802be27
parentba8c2b75b02a162202d31e6200ab15da1035a7d0
SMB3: force unmount was failing to close deferred close files

In investigating a failure with xfstest generic/392 it
was noticed that mounts were reusing a superblock that should
already have been freed. This turned out to be related to
deferred close files keeping a reference count until the
closetimeo expired.

Currently the only way an fs knows that mount is beginning is
when force unmount is called, but when this, ie umount_begin(),
is called all deferred close files on the share (tree
connection) should be closed immediately (unless shared by
another mount) to avoid using excess resources on the server
and to avoid reusing a superblock which should already be freed.

In umount_begin, close all deferred close handles for that
share if this is the last mount using that share on this
client (ie send the SMB3 close request over the wire for those
that have been already closed by the app but that we have
kept a handle lease open for and have not sent closes to the
server for yet).

Reported-by: David Howells <dhowells@redhat.com>
Acked-by: Bharath SM <bharathsm@microsoft.com>
Cc: <stable@vger.kernel.org>
Fixes: 78c09634f7dc ("Cifs: Fix kernel oops caused by deferred close for files.")
Signed-off-by: Steve French <stfrench@microsoft.com>
fs/cifs/cifsfs.c