Thanks for figuring it out. :)
It was a very helpful information.
On Sun, Dec 21, 2008 at 1:10 AM, Sandeep K Sinha
<sandeepksinha@xxxxxxxxx> wrote:
> Hi Rohit,
>
> On Sat, Dec 20, 2008 at 9:13 PM, Rohit Sharma <imreckless@xxxxxxxxx> 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;
>> 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
>> most-recentl
>> 59 * allocated to this file. This give us the goal (target)
>> for the next
>
> Look at the comment, this clearly suggests that its a file specific information.
> So, its specific to inode.
>
>> 60 * allocation when we detect linearly ascending requests.
>> 61 */
>
> It can be only to a file, as for the file system it is already ascending.
>
>> 62 ext2_fsblk_t last_alloc_physical_block;
>> 63};
>>
>>
>> this information is maintained by ext2 for every inode.
>>
>> here last_alloc_logical_block is for every inode or its for filesystem.
>>
>
> inode.
>
>> I mean if we are allocating blocks for inode
>> it can be block no. 0 to n logically
>> and physically like 23 24 25 34 36 40 41 42
>>
>> i mean to say
>>
>> is it like
>>
>> inode1 has logical blocks 1 2 3 , physical 22 23 24
>> inode2 has logical blocks 4 5 6 , physical 34 35 50
>>
>
> This is correct.
>> OR
>>
>> inode1 has logical blocks 0 1 2 , physical 22 23 24
>> inode2 has logical blocks 0 1 2 , physical 34 35 50
>>
>
> You cannot have the same logical block assigned to two inodes with
> diff physical blocks, probably. Doesn't make sense to me.
>> ??
>>
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>>
>
>
>
> --
> Regards,
> Sandeep.
>
>
>
>
>
>
> "To learn is to change. Education is a process that changes the learner."
>
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