linux-ext4 - Re: [RFC v3 11/13] vfs: add 3 new ioctl interfaces

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Date:	Mon, 15 Oct 2012 15:57:22 +0800
From:	Zhi Yong Wu <zwu.kernel@...il.com>
To:	Dave Chinner <david@...morbit.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
	linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	linuxram@...ux.vnet.ibm.com, viro@...iv.linux.org.uk,
	dave@...os.cz, tytso@....edu, cmm@...ibm.com,
	Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
Subject: Re: [RFC v3 11/13] vfs: add 3 new ioctl interfaces

On Mon, Oct 15, 2012 at 3:48 PM, Dave Chinner <david@...morbit.com> wrote:
> On Wed, Oct 10, 2012 at 06:07:33PM +0800, zwu.kernel@...il.com wrote:
>> From: Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
>>
>>   FS_IOC_GET_HEAT_INFO: return a struct containing the various
>> metrics collected in btrfs_freq_data structs, and also return a
>> calculated data temperature based on those metrics. Optionally, retrieve
>> the temperature from the hot data hash list instead of recalculating it.
>>
>>   FS_IOC_GET_HEAT_OPTS: return an integer representing the current
>> state of hot data tracking and migration:
>>
>> 0 = do nothing
>> 1 = track frequency of access
>>
>>   FS_IOC_SET_HEAT_OPTS: change the state of hot data tracking and
>> migration, as described above.
> .....
>> +struct hot_heat_info {
>> +     __u64 avg_delta_reads;
>> +     __u64 avg_delta_writes;
>> +     __u64 last_read_time;
>> +     __u64 last_write_time;
>> +     __u32 num_reads;
>> +     __u32 num_writes;
>> +     __u32 temperature;
>> +     __u8 live;
>> +     char filename[PATH_MAX];
>
> Don't put the filename in the ioctl and open the file in the kernel.
> Have userspace open the file directly and issue the ioctl on the fd
> that is returned.
OK, thanks. By the way, do you think that it is necessary to provide
another new ioctl interface to set the temperature value?
>
> Cheers,
>
> Dave.
> --
> Dave Chinner
> david@...morbit.com



-- 
Regards,

Zhi Yong Wu
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