linux-ext4 - Re: [PATCH 5 2/4] Return 32/64-bit dir name hash according to usage type

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Message-ID: <4F95D65A.8070608@redhat.com>
Date:	Mon, 23 Apr 2012 17:23:22 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Bernd Schubert <bernd.schubert@...m.fraunhofer.de>
CC:	linux-nfs@...r.kernel.org, linux-ext4@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, Fan Yong <yong.fan@...mcloud.com>,
	bfields@...hat.com, Andreas Dilger <adilger@...mcloud.com>
Subject: Re: [PATCH 5 2/4] Return 32/64-bit dir name hash according to usage
 type

On 4/23/12 3:52 PM, Bernd Schubert wrote:
> On 04/23/2012 10:37 PM, Eric Sandeen wrote:

...

> diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c
> index b867862..3a4988e2 100644
> --- a/fs/ext4/dir.c
> +++ b/fs/ext4/dir.c
> @@ -363,7 +363,7 @@ loff_t ext4_dir_llseek(struct file *file, loff_t
> offset, int origin)
>  		goto out_err;
> 
>  	if (!dx_dir) {
> -		if (offset > inode->i_sb->s_maxbytes)
> +		if (offset > i_size_read(inode))
>  			goto out_err;
>  	} else if (offset > ext4_get_htree_eof(file))
>  		goto out_err;

I'm curious about the above as well as:

        case SEEK_END:
                if (unlikely(offset > 0))
                        goto out_err; /* not supported for directories */

The previous .llseek handler, and the generic handler for other filesystems, allow seeking past the end of the dir AFAICT.  (not sure why you'd want to, but I don't see that you'd get an error back).

Is there a reason to uniquely exclude it in ext4?  Does that line up with POSIX?

-Eric

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