linux-kernel - Re: [PATCH 09/16] GFS2: Extended attribute & ACL support

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Date:	Tue, 05 Sep 2006 13:23:58 +0100
From:	Steven Whitehouse <swhiteho@...hat.com>
To:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
Cc:	linux-kernel@...r.kernel.org,
	Russell Cattelan <cattelan@...hat.com>,
	David Teigland <teigland@...hat.com>,
	Ingo Molnar <mingo@...e.hu>, hch@...radead.org
Subject: Re: [PATCH 09/16] GFS2: Extended attribute & ACL support

Hi,

On Mon, 2006-09-04 at 18:55 +0200, Jan Engelhardt wrote:
> >+#if 0
> >+	else if ((ip->i_di.di_flags & GFS2_DIF_EA_PACKED) &&
> >+		 er->er_type == GFS2_EATYPE_SYS)
> >+		return 1;
> >+#endif
> 
now removed.

> >+/**
> >+ * ea_get_unstuffed - actually copies the unstuffed data into the
> >+ *                    request buffer
> >+ * @ip:
> >+ * @ea:
> >+ * @data:
> >+ *
> >+ * Returns: errno
> >+ */
> 
> There are more of these. If you have the time, please fill in.
> 
I've filled in the remaining ones in this file so far.

> >+			*dataptr++ = cpu_to_be64((uint64_t)bh->b_blocknr);
> 
> At least on i386, this cast seems unnecessary, since
> 
> include/asm-i386/byteorder.h:
> static __inline__ __attribute_const__ __u64 ___arch__swab64(__u64 val)          
> 
> but someone else should probably prove me right/wrong.
> 
I agree, so I've removed it.

> >+	if (private)
> >+		ea_set_remove_stuffed(ip, (struct gfs2_ea_location *)private);
> 
> private is a void *, ergo nocast.
> 
ok

> >+	gfs2_glock_dq_uninit(&al->al_ri_gh);
> 
> Another Ken Preslan gem? al_ri_gh_t then.
> 
:-) It is, but it does make sense:

 The al prefix means its part of a gfs2_alloc structure
 The ri stands for "Resource Index" one of GFS2's special files which in
this case contains a list of the on-disk locations of the resource
groups (think ext2/3 block groups and you won't be too far wrong).
 The gh stands for gfs2_holder which is the structure associated with
holding a glock on something (in this case the Resource Index inode).

> >+		return (5 + (ea->ea_name_len + 1));
> ()
> 
> >+unsigned int gfs2_ea_name2type(const char *name, char **truncated_name)
> >+{
> >+	unsigned int type;
> >+
> >+	if (strncmp(name, "system.", 7) == 0) {
> >+		type = GFS2_EATYPE_SYS;
> >+		if (truncated_name)
> >+			*truncated_name = strchr(name, '.') + 1;
> 
> Since we already know where the dot is (otherwise, strncmp would have failed),
> we can omit the relookup with strchr:
> 
> 	*truncated_name = name + sizeof("system.") - 1;
> 
ok, all fixed. Also I noticed as soon as I did that, that it was
possible to add a bunch more const in various places, so I did that too.
I've also taken a look over the indenting which appeared a bit odd in
places and fixed up that at the same time. The patch is here:

http://www.kernel.org/git/?p=linux/kernel/git/steve/gfs2-2.6.git;a=commitdiff;h=cca195c5c09b81065018dee39f4013b95bf47502

Steve.


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