linux-kernel - Re: [PATCH 05/11] sysfs: sysfs_chmod

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Date:	Tue, 24 Jun 2008 13:45:27 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Daniel Lezcano <dlezcano@...ibm.com>
CC:	Benjamin Thery <benjamin.thery@...l.net>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Eric Biederman <ebiederm@...ssion.com>,
	Serge Hallyn <serue@...ibm.com>, linux-kernel@...r.kernel.org,
	Al Viro <viro@....linux.org.uk>,
	Linux Containers <containers@...ts.osdl.org>
Subject: Re: [PATCH 05/11] sysfs: sysfs_chmod_file handle multiple superblocks

Hello,

Daniel Lezcano wrote:
>> I think it would be great if sysfs_chmod_file can do all-or-nothing
>> instead of failing half way through but given the interface of
>> notify_change(), it could be difficult to implement.  Any ideas?
> 
> Is it acceptable to queue the notifications in a list until we are in
> the loop and loop again to notify when exiting the first loop without
> error ?

Can you please take a look at the following patch?

http://article.gmane.org/gmane.linux.file-systems/24484

Which replaces notify_change() call to two calls to sysfs_setattr() and
fsnotify_change().  The latter never fails and the former should always
succeed if inode_change_ok() succeeds (inode_setattr() never fails
unless the size is changing), so I think the correct thing to do is...

* Separate out sysfs_do_setattr() which doesn't do inode_change_ok() and
just sets the attributes.  Making it a void function which triggers
WARN_ON() when inode_setattr() fails would be a good idea.

* Implement sysfs_chmod_file() in similar way rename/move are
implemented - allocate all resources and check conditions and then iff
everything looks okay commit the operation by calling sysfs_do_setattr().

How does that sound?

Thanks.

-- 
tejun
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