linux-kernel - [PATCH] netfs, cifs: Fix mtime/ctime update for mmapped writes

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Message-ID: <2106017.1726559668@warthog.procyon.org.uk>
Date: Tue, 17 Sep 2024 08:54:28 +0100
From: David Howells <dhowells@...hat.com>
To: Steve French <sfrench@...ba.org>,
    Christian Brauner <brauner@...nel.org>
cc: dhowells@...hat.com, kernel test robot <oliver.sang@...el.com>,
    Jeff Layton <jlayton@...nel.org>, Paulo Alcantara <pc@...guebit.com>,
    linux-cifs@...r.kernel.org, netfs@...ts.linux.dev,
    linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] netfs, cifs: Fix mtime/ctime update for mmapped writes

The cifs flag CIFS_INO_MODIFIED_ATTR, which indicates that the mtime and
ctime need to be written back on close, got taken over by netfs as
NETFS_ICTX_MODIFIED_ATTR to avoid the need to call a function pointer to
set it.

The flag gets set correctly on buffered writes, but doesn't get set by
netfs_page_mkwrite(), leading to occasional failures in generic/080 and
generic/215.

Fix this by setting the flag in netfs_page_mkwrite().

Fixes: 73425800ac94 ("netfs, cifs: Move CIFS_INO_MODIFIED_ATTR to netfs_inode")
Reported-by: kernel test robot <oliver.sang@...el.com>
Closes: https://lore.kernel.org/oe-lkp/202409161629.98887b2-oliver.sang@intel.com
Signed-off-by: David Howells <dhowells@...hat.com>
cc: Jeff Layton <jlayton@...nel.org>
cc: Steve French <sfrench@...ba.org>
cc: Paulo Alcantara <pc@...guebit.com>
cc: linux-cifs@...r.kernel.org
cc: netfs@...ts.linux.dev
cc: linux-fsdevel@...r.kernel.org
---
 fs/netfs/buffered_write.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/netfs/buffered_write.c b/fs/netfs/buffered_write.c
index d7eae597e54d..b3910dfcb56d 100644
--- a/fs/netfs/buffered_write.c
+++ b/fs/netfs/buffered_write.c
@@ -552,6 +552,7 @@ vm_fault_t netfs_page_mkwrite(struct vm_fault *vmf, struct netfs_group *netfs_gr
 		trace_netfs_folio(folio, netfs_folio_trace_mkwrite);
 	netfs_set_group(folio, netfs_group);
 	file_update_time(file);
+	set_bit(NETFS_ICTX_MODIFIED_ATTR, &ictx->flags);
 	if (ictx->ops->post_modify)
 		ictx->ops->post_modify(inode);
 	ret = VM_FAULT_LOCKED;