cifs: consolidate time_last_write stamp into _cifsFileInfo_put()

commit 0e3ea5445c228048f937ad5a944c27859a78f971 upstream.

The time_last_write stamp was scattered across cifs_close(),
smb2_deferred_work_close(), and the three drain functions in misc.c.
This missed the case where background I/O holds the final reference
after userspace close() returns, and required explicit maintenance at
each close-path site.

Move the smp_store_release() into _cifsFileInfo_put(), immediately
before releasing open_file_lock.  This single location covers all
close paths unconditionally: normal close, background I/O dropping the
final reference, deferred close via timer or external drain.  The
spinlock's store-release/load-acquire pairing with is_inode_writable()
already provides the ordering guarantee documented in
is_size_safe_to_change().

Remove the now-redundant stamps from cifs_close(),
smb2_deferred_work_close(), and all six stamp sites in the misc.c
deferred-close drain functions.

Fixes: e8a8d54c2d50 ("cifs: prevent readdir from changing file size due to stale directory metadata")
Signed-off-by: Frank Sorenson <sorenson@redhat.com>
Reviewed-by: Paulo Alcantara (Red Hat) <pc@manguebit.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Cc: Jiri Slaby <jirislaby@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

0 files changed, 0 insertions, 0 deletions