linux-ext4 - Re: [PATCH 1/2 v2] libext2fs: introduce lseek SEEK

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Date:	Tue, 15 Jan 2013 21:02:11 +0800
From:	Zheng Liu <gnehzuil.liu@...il.com>
To:	Theodore Ts'o <tytso@....edu>
Cc:	linux-ext4@...r.kernel.org, Zheng Liu <wenqing.lz@...bao.com>
Subject: Re: [PATCH 1/2 v2] libext2fs: introduce lseek SEEK_DATA/HOLE

On Mon, Jan 14, 2013 at 10:23:29PM -0500, Theodore Ts'o wrote:
> On Mon, Jan 14, 2013 at 10:18:30PM +0800, Zheng Liu wrote:
> > 
> > ext2fs_file_llseek_data/hole() seem to be weird because ext2_file_t
> > structure is hidden by a typedef.  The caller can not dereference
> > it.  So I define a marco called EXT2_SEEK_OFFSET_INVALID to let the
> > caller indicate that it find the data/hole from ext2_file_t->pos or
> > from offset.  What do you think?
> 
> Is the problem you're worried about is that the user can't get current
> location?
> 
> That's pretty easy to solve.  You can get it the same way it works
> with the lseek(2) system call.
> 
>      retval = ext2fs_file_llseek(file, 0, SEEK_CUR, &pos);
> 
> Upon the return, pos will be contain the current file offset.

Ah, I see.  I will remove EXT2_SEEK_OFFSET_INVALID flag in next version.

Thanks,
                                                - Zheng
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