linux-kernel - Re: [PATCH 02/16] GFS2: Core locking interface

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Date:	Mon, 4 Sep 2006 19:51:39 +0200 (MEST)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	Steven Whitehouse <swhiteho@...hat.com>
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 02/16] GFS2: Core locking interface

Hi,

>> >Unfortunately thats not possible as the struct gfs2_sbd is actually
>> >changed lower down the call chain, but only in the lock_dlm module.
>> 
>> +void gfs2_lm_unmount(struct gfs2_sbd *sdp)
>> +{
>> +	if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
>> +		gfs2_unmount_lockproto(&sdp->sd_lockstruct);
>> +}
>> 
>> I can't follow... test_bit does not modify *sdp or sdp->sd_flags, and
>> gfs2_unmount_lockproto does not either.
>
>sd_lockstruct is part of the superblock and fields in the lockstruct are
>changed by (for example) fs/gfs2/locking/dlm/mount.c: gdlm_unmount() so
>I don't think its valid to mark the superblock const here (despite being
>a great fan of using const in general).

Ah I just looked, and saw that

  struct {
      struct ... sd_lockstruct;
  } sdp;

sd_lockstruct is not a pointer but a struct in line. Yes, you are right.
It would have been valid only if sd_lockstruct was a pointer to non-const
memory.


Jan Engelhardt
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