[PATCH 1/8] netfs: Fix mtime/ctime update for mmapped writes

[Steve French]

added to cifs-2.6.git for-next since it is important as it fixes a
regression affecting cifs.ko

On Mon, Sep 23, 2024 at 10:08 AM David Howells <dhowells at redhat.com> wrote:
>
> 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 at intel.com>
> Closes: https://lore.kernel.org/oe-lkp/202409161629.98887b2-oliver.sang@intel.com
> Signed-off-by: David Howells <dhowells at redhat.com>
> cc: Jeff Layton <jlayton at kernel.org>
> cc: Steve French <sfrench at samba.org>
> cc: Paulo Alcantara <pc at manguebit.com>
> cc: linux-cifs at vger.kernel.org
> cc: netfs at lists.linux.dev
> cc: linux-fsdevel at vger.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;
>
>


-- 
Thanks,

Steve