linux-kernel - Re: [PATCH 8/8] net: sunrpc: Replace CURRENT_TIME by current_fs

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Date:	Mon, 22 Feb 2016 10:34:31 -0500
From:	Trond Myklebust <trond.myklebust@...marydata.com>
To:	Deepa Dinamani <deepa.kernel@...il.com>
Cc:	Linux FS-devel Mailing List <linux-fsdevel@...r.kernel.org>,
	y2038@...ts.linaro.org, Arnd Bergmann <arnd@...db.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Jeff Layton <jlayton@...chiereds.net>,
	Anna Schumaker <anna.schumaker@...app.com>,
	"David S. Miller" <davem@...emloft.net>,
	Linux NFS Mailing List <linux-nfs@...r.kernel.org>,
	Linux Network Devel Mailing List <netdev@...r.kernel.org>
Subject: Re: [PATCH 8/8] net: sunrpc: Replace CURRENT_TIME by current_fs_time()

On Mon, Feb 22, 2016 at 10:17 AM, Deepa Dinamani <deepa.kernel@...il.com> wrote:
>
> CURRENT_TIME macro is not appropriate for filesystems as it
> doesn't use the right granularity for filesystem timestamps.
> Use current_fs_time() instead.
>
> Signed-off-by: Deepa Dinamani <deepa.kernel@...il.com>
> Cc: "J. Bruce Fields" <bfields@...ldses.org>
> Cc: Jeff Layton <jlayton@...chiereds.net>
> Cc: Trond Myklebust <trond.myklebust@...marydata.com>
> Cc: Anna Schumaker <anna.schumaker@...app.com>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: linux-nfs@...r.kernel.org
> Cc: netdev@...r.kernel.org
> ---
>  net/sunrpc/rpc_pipe.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
> index 31789ef..bab3187 100644
> --- a/net/sunrpc/rpc_pipe.c
> +++ b/net/sunrpc/rpc_pipe.c
> @@ -477,7 +477,9 @@ rpc_get_inode(struct super_block *sb, umode_t mode)
>                 return NULL;
>         inode->i_ino = get_next_ino();
>         inode->i_mode = mode;
> -       inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
> +       inode->i_atime = current_fs_time(sb);
> +       inode->i_mtime = inode->i_atime;
> +       inode->i_ctime = inode->i_atime;
>         switch (mode & S_IFMT) {
>         case S_IFDIR:
>                 inode->i_fop = &simple_dir_operations;

Why would we care? This is a pseudo-fs. There is no expectation w.r.t.
timestamp accuracy or resolution.

Cheers,
  Trond