Subject: Re: [PATCH v2 4/5] fs: Introduce SINGLE dentries for pipes, socket, anon fd

From: Eric Dumazet <dada1-fPLkHRcR87vqlBn2x/[email-masked]>
Date: Sat, 29 Nov 2008 12:14:18 +0100

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