linux-ext4 - Re: block allocation for ext2

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Message-ID: <2d08ef090812182342p1a210adcgd70d8a5cf3bf828c@mail.gmail.com>
Date:	Fri, 19 Dec 2008 13:12:32 +0530
From:	"Rohit Sharma" <imreckless@...il.com>
To:	"Jan Kara" <jack@...e.cz>
Cc:	Kernelnewbies <kernelnewbies@...linux.org>,
	ext4 <linux-ext4@...r.kernel.org>
Subject: Re: block allocation for ext2_mkdir

On Fri, Dec 19, 2008 at 4:09 AM, Jan Kara <jack@...e.cz> wrote:
>> On Fri, Dec 19, 2008 at 12:12 AM, Rohit Sharma <imreckless@...il.com> wrote:
>> > How does ext2 allocate blocks for directory.
>> >
>> > ext2_mkdir               calls            ext2_make_empty
>> >
>> > ext2_make_empty     calls           __ext2_write_begin
>> >
>> > __ ext2_write_begin   calls           block_write_begin
>> >
>> > my query is that how does this function allocates blocks for directories. ??
>> >
>>
>> Does ext2 uses ext2_get_block to allocate blocks for both files and
>> directories. ??
>  Yes, exactly. Ext2 (unlike ext3 or ext4) treats directories the same
> ways as ordinary files and thus ext2_get_block is used for block
> allocation.
>

Can i modify this function to restrict allocation of blocks
to a particular block group ?

Like i want that my abc.txt file should be in block group 5 suppose, then
what should i do?

>                                                                Honza
>
> --
> Jan Kara <jack@...e.cz>
> SuSE CR Labs
>
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