linux-kernel - Re: [PATCH RFC v2 2/2] vfs: add O

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Message-ID: <20150516215030.GI11068@azat>
Date:	Sun, 17 May 2015 00:50:30 +0300
From:	Azat Khuzhin <a3at.mail@...il.com>
To:	Zach Brown <zab@...bo.net>
Cc:	Sage Weil <sweil@...hat.com>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-api@...r.kernel.org
Subject: Re: [PATCH RFC v2 2/2] vfs: add O_NOCMTIME

On Fri, May 15, 2015 at 02:23:48PM -0700, Zach Brown wrote:
> Add a O_NOCMTIME flag which prevents inode time updates on writes and
> can greatly reduce the IO overhead of writes to allocated and
> initialized regions of files.

> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h

You may also want to resolve this:

/*
 * Don't update ctime and mtime.
 *
 * Currently a special hack for the XFS open_by_handle ioctl, but we'll
 * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon.
 */
#define FMODE_NOCMTIME      ((__force fmode_t)0x800)
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