linux-kernel - Re: Linux slack space question

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Message-ID: <b6c5339f0612080946k57f9271fmdb8ed13ffefdf92b@mail.gmail.com>
Date:	Fri, 8 Dec 2006 12:46:05 -0500
From:	"Bob Copeland" <me@...copeland.com>
To:	"Maria Short" <mgolod@...e.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Linux slack space question

On 12/8/06, Maria Short <mgolod@...e.org> wrote:
> What I need is the code in the kernel that does that. I have been
> looking at http://lxr.linux.no/source/fs/ext3/inode.c but I could not
> find the specific code for partially filling the last block and
> placing an EOF at the end, leaving the rest to slack space.

There is no place where it writes an EOF.  The size of the file is
stored in metadata (e.g. inode->i_size), and only the appropriate
number of blocks up to i_size are read or written to.  Look at
ext3_get_block to see how blocks are read and allocated.

Bob
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