We can find out no. of block currently being used by the donor inode,
The data we read from donor inode has to be in some buffer or page,
is there a way we can associate this buffer with the reciever inode
or write the contents of the buffer to the new inode.
On Tue, Jan 6, 2009 at 10:46 PM, Rohit Sharma <imreckless@xxxxxxxxx> wrote:
> On Tue, Jan 6, 2009 at 10:43 PM, Manish Katiyar <mkatiyar@xxxxxxxxx> wrote:
>> On Tue, Jan 6, 2009 at 10:15 PM, Rohit Sharma <imreckless@xxxxxxxxx> wrote:
>>> On Tue, Jan 6, 2009 at 7:42 PM, rishi agrawal <postrishi@xxxxxxxxx> wrote:
>>>> yes i suppose the donor inode is known
>>>> moreover the receiver inode's number is also known
>>>>
>>>> On Tue, Jan 6, 2009 at 6:54 PM, Manish Katiyar <mkatiyar@xxxxxxxxx> wrote:
>>>>>
>>>>> On Tue, Jan 6, 2009 at 4:06 PM, Rohit Sharma <imreckless@xxxxxxxxx> wrote:
>>>>> > I want to read data blocks from one inode
>>>>> > and copy it to other inode.
>>>>> >
>>>>> > I mean to copy data from data blocks associated with one inode
>>>>> > to the data blocks associated with other inode.
>>>>>
>>>>> Copying 4K chunk of data itself is a costly operation. and depending
>>>
>>> Yes its a costly operation, but if this can be done then
>>> we can definitely copy n blocks at a time.
>>>
>>>>> on the size of your donor inode this can be huge . Why do you want to
>>>>> do that ? Do you know the inode of the donor inode ?
>>>
>>> For physically relocating a file from one disk to other.
>>>
>>> Yes Manish, i know the donor inode and i will create the reciever inode.
>>
>> I am guessing .......will something like this work ?
>>
>> ino_t donor_inode_num;
>> struct inode *donor_inode = FS_iget(sb , donor_inode_num);
>> struct FS_inode_info * fsi = FSI(donor_inode) ; // Do the regular
>> container_of stuff here
>>
>> for ( i = 0; i < (donor_inode->i_size + sb->s_blocksize -
>> 1)/sb->s_blocksize ; i ++ ) {
>> // Do a memmove or memcpy here from fsi->i_data[i]
>> }
>>
>> I am not sure though how will you prevent the donor inode from being
>> changed/resized during this period.
>
> I am thinking of remounting ext2 in readonly mode, or i'll change the
> mount flags to readonly. But i m not sure if internally i can copy the
> data from one block to other.
>
>>
>> Thanks -
>> Manish
>>
>>
>>>
>>> Can we do that in kernel space.?
>>>>>
>>>>> thanks -
>>>>> Manish
>>>>> >
>>>>> > Is that possible in kernel space.?
>>>>> > --
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>>>>> >
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>>>>
>>>>
>>>>
>>>> --
>>>> Regards,
>>>> Rishi B. Agrawal
>>>>
>>>>
>>>
>>
>
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