linux-kernel - Re: [PATCH 2/8] exofs: file and file

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Date:	Tue, 31 Mar 2009 01:04:17 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Boaz Harrosh <bharrosh@...asas.com>
Cc:	Avishay Traeger <avishay@...il.com>, Jeff Garzik <jeff@...zik.org>,
	Evgeniy Polyakov <zbr@...emap.net>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	open-osd <osd-dev@...n-osd.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Subject: Re: [PATCH 2/8] exofs: file and file_inode operations

On Wed, 18 Mar 2009 19:58:47 +0200 Boaz Harrosh <bharrosh@...asas.com> wrote:

> implementation of the file_operations and inode_operations for
> regular data files.
> 
> Most file_operations are generic vfs implementations except:
> - exofs_truncate will truncate the OSD object as well
> - Generic file_fsync is not good for none_bd devices so open code it
> - The default for .flush in Linux is todo nothing so call exofs_fsync
>   on the file.
> 
>
> ...
>
> +static int exofs_file_fsync(struct file *filp, struct dentry *dentry,
> +			    int datasync)
> +{
> +	int ret1, ret2;
> +	struct address_space *mapping = filp->f_mapping;
> +
> +	ret1 = filemap_write_and_wait(mapping);
> +	ret2 = file_fsync(filp, dentry, datasync);
> +
> +	return ret1 ? ret1 : ret2;
> +}

It might be better to abort if filemap_write_and_wait() failed.  if the
hardware is bad, these things can take a looooong time retrying and
timing out.  There's no point in doubling the delay.

>
> ...
>

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