linux-ext4 - Re: ext2_block_alloc

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Date:	Sun, 21 Dec 2008 09:25:45 +0800
From:	"Peter Teoh" <htmldeveloper@...il.com>
To:	"Rohit Sharma" <imreckless@...il.com>
Cc:	Kernelnewbies <kernelnewbies@...linux.org>,
	ext4 <linux-ext4@...r.kernel.org>
Subject: Re: ext2_block_alloc_info

On Sat, Dec 20, 2008 at 11:43 PM, Rohit Sharma <imreckless@...il.com> wrote:
> A little confusion.
>
> Just refer this structure in linux/ext2_fs_sb.h
>
> struct ext2_block_alloc_info {
>  46        /* information about reservation window */
>  47        struct ext2_reserve_window_node rsv_window_node;
>  48        /*
>  49         * was i_next_alloc_block in ext2_inode_info
>  50         * is the logical (file-relative) number of the
>  51         * most-recently-allocated block in this file.
>  52         * We use this for detecting linearly ascending allocation requests.
>  53         */
>  54        __u32                   last_alloc_logical_block;

if i interpret the meaning of "file-relative logical number"
correctly, and since one-file-one-inode concept, then it means that it
should mean inode-relative logical block number.

>  55        /*
>  56         * Was i_next_alloc_goal in ext2_inode_info
>  57         * is the *physical* companion to i_next_alloc_block.
>  58         * it the the physical block number of the block which was

> inode1 has logical blocks 0 1 2 , physical 22 23 24
> inode2 has logical blocks 0 1 2 , physical 34 35 50
>

as per comment above, the sequence above looks likely, but then this
is my guess again.

-- 
Regards,
Peter Teoh

Ernest Hemingway - "Never mistake motion for action."
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