linux-ext4 - Re: [PATCH 1/3] Add ioctl FITRIM.

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Date:	Fri, 24 Sep 2010 11:03:51 -0600
From:	Andreas Dilger <adilger.kernel@...ger.ca>
To:	Lukas Czerner <lczerner@...hat.com>
Cc:	linux-ext4@...r.kernel.org, tytso@....edu, rwheeler@...hat.com,
	sandeen@...hat.com, snitzer@...il.com
Subject: Re: [PATCH 1/3] Add ioctl FITRIM.

On 2010-09-24, at 09:35, Lukas Czerner wrote:
> array[0] - (start) first Byte to trim
> array[1] - (len) number of Bytes to trim from start
> array[2] - (minlen) minimum extent length to trim, free extents shorter
> 
> than this number of Bytes will be ignored. This number will be rounded
> up to the block size.
> 
> It is also possible to specify NULL as an argument. In this case the
> arguments will set itself as follows:
> 
> args[0] = 0;
> args[1] = ULLONG_MAX;
> args[2] = 0;

(minor) you use "array[]" in one place and "args[]" in another.

> +#define FITRIM		_IOWR('X', 121, uint64_t)	/* Trim */

This ioctl definition isn't strictly correct.  The "size" parameter is actually uint64_t[3], though I'm not sure whether you need to define a structure in order to specify this.

Cheers, Andreas





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