Re: [PATCH RFC v2 2/2] vfs: add O_NOCMTIME

[Azat Khuzhin]

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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