linux-kernel - Re: [PATCH 0/4] cgroups: show correct file mode

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Date:	Tue, 03 Mar 2009 09:15:42 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
CC:	Paul Menage <menage@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux Containers <containers@...ts.linux-foundation.org>
Subject: Re: [PATCH 0/4] cgroups: show correct file mode

>> +/**
>> + * cgroup_file_mode - deduce file mode of a control file
>> + * @cft: the control file in question
>> + *
>> + * returns cftype->mode if ->mode is not 0
>> + * returns 0644 if it has both a read and a write handler
>> + * returns 0444 if it has only a read handler
>> + * returns 0200 if it has only a write hander
>> + */
>> +static int cgroup_file_mode(const struct cftype *cft)
>> +{
>> +	int mode = 0;
>> +
>> +	if (cft->mode)
>> +		return cft->mode;
>> +
>> +	if (cft->read || cft->read_u64 || cft->read_s64 ||
>> +	    cft->read_map || cft->read_seq_string)
>> +		mode += 0444;
>> +
>> +	if (cft->write || cft->write_u64 || cft->write_s64 ||
>> +	    cft->write_string || cft->trigger)
>> +		mode += 0200;
>> +
> 
> += is not |=...
> 

Ah, yes, though both happen to result in 0644.

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