Message-ID: <4931240A.703@cosmosbay.com>
Date: Sat, 29 Nov 2008 12:14:18 +0100
From: Eric Dumazet <dada1@cosmosbay.com>
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CC: Ingo Molnar <mingo@elte.hu>, Christoph Hellwig <hch@infradead.org>,
       David Miller <davem@davemloft.net>, "Rafael J. Wysocki" <rjw@sisk.pl>,
       linux-kernel@vger.kernel.org,
       "kernel-testers@vger.kernel.org >> Kernel Testers List" 
	<kernel-testers@vger.kernel.org>,
       Mike Galbraith <efault@gmx.de>, Peter Zijlstra <a.p.zijlstra@chello.nl>,
       Linux Netdev List <netdev@vger.kernel.org>,
       Christoph Lameter <cl@linux-foundation.org>,
       linux-fsdevel@vger.kernel.org, Al Viro <viro@ZenIV.linux.org.uk>
Subject: Re: [PATCH v2 4/5] fs: Introduce SINGLE dentries for pipes, socket,
 anon fd
References: <20081121083044.GL16242@elte.hu> <49267694.1030506@cosmosbay.com> <20081121.010508.40225532.davem@davemloft.net> <4926AEDB.10007@cosmosbay.com> <4926D022.5060008@cosmosbay.com> <20081121152148.GA20388@elte.hu> <4926D39D.9050603@cosmosbay.com> <20081121153453.GA23713@elte.hu> <492DDB6A.8090806@cosmosbay.com> <493100E7.3030907@cosmosbay.com> <20081129103836.GA11959@logfs.org>
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Jörn Engel a écrit :
> On Sat, 29 November 2008 09:44:23 +0100, Eric Dumazet wrote:
>> +struct dentry *d_alloc_single(const struct qstr *name, struct inode *inode)
>> +{
>> +	struct dentry *entry;
>> +
>> +	entry = d_alloc(NULL, name);
>> +	if (entry) {
>> +		entry->d_sb = inode->i_sb;
>> +		entry->d_parent = entry;
>> +		entry->d_flags |= DCACHE_SINGLE | DCACHE_DISCONNECTED;
>> +		entry->d_inode = inode;
>> +		fsnotify_d_instantiate(entry, inode);
>> +		security_d_instantiate(entry, inode);
>> +	}
>> +	return entry;
> 
> Calling the struct dentry entry had me onfused a bit.  I believe
> everyone else (including the code you removed) uses dentry.

Ah yes, it seems I took it from d_instantiate(), I guess a cleanup
patch would be nice.

> 
>> @@ -918,7 +906,7 @@ struct file *create_write_pipe(int flags)
>>  	struct inode *inode;
>>  	struct file *f;
>>  	struct dentry *dentry;
>> -	struct qstr name = { .name = "" };
>> +	static const struct qstr name = { .name = "" };
>>  
>>  	err = -ENFILE;
>>  	inode = get_pipe_inode();
> ...
>> @@ -371,20 +358,13 @@ static int sock_alloc_fd(struct file **filep, int flags)
>>  static int sock_attach_fd(struct socket *sock, struct file *file, int flags)
>>  {
>>  	struct dentry *dentry;
>> -	struct qstr name = { .name = "" };
>> +	static const struct qstr name = { .name = "" };
> 
> These two could even be combined.
> 
> And of course I realize that I comment on absolute trivialities.  On the
> whole, I couldn't spot a real problem in your patches.

Well, at least you reviewed it, it's the important point !

Thanks Jörn

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