linux-ext4 - Re: [PATCH 3/3] Add a pair of system calls to make extended file stats available [ver #2]

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Message-Id: <B82FC7EE-93D2-4D86-906D-5D6AFA502709@dilger.ca>
Date:	Wed, 30 Jun 2010 03:45:59 -0600
From:	Andreas Dilger <adilger@...ger.ca>
To:	David Howells <dhowells@...hat.com>
Cc:	viro@...IV.linux.org.uk, smfrench@...il.com, jlayton@...hat.com,
	mcao@...ibm.com, aneesh.kumar@...ux.vnet.ibm.com,
	linux-cifs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, samba-technical@...ts.samba.org,
	sjayaraman@...e.de, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 3/3] Add a pair of system calls to make extended file stats available [ver #2]

On 2010-06-29, at 19:17, David Howells wrote:
> int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
> 		 struct kstat *stat)
> {
> +	if (S_ISDIR(inode->i_mode)) {
> +		stat->result_flags |= XSTAT_QUERY_DATA_VERSION;
> +		stat->data_version = inode->i_version;
> +	}

Note that when ext4 is mounted with the "i_version" option that the i_version field is also updated on regular files, for use by NFSv4.  See, for example, ext4_mark_iloc_dirty().

I had a hard time finding this, even though I knew it was there somewhere, because it isn't modifying "i_version" directly, but rather calling a helper function inode_inc_iversion().

It probably makes sense to always return i_version, unless it is 0.

Cheers, Andreas





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