Files > 2GB and 3.6 version (after converting from 3.5)

Files > 2GB and 3.6 version (after converting from 3.5)

[Pawel Jagoda]

Hello.

I've backup my data - one file, which have 4060 MB. Unfortunetly I didn't
point out that my destination file system is in old 3.5.x version. And of
course I cannot read my data after 2GB (it says: Input/Output Error). I
have converted my filesystem into 3.6.x, but still I'm not able to read
this file. But if I create new file (for example: dd if=/dev/zero
of=/mnt/hda3/some_file bs=1M count=3000), there is no problem to read it.
Is it possible, to do something to restore my backup from this file? If
yes, then how can I do it?


Paul.

Re: Files > 2GB and 3.6 version (after converting from 3.5)

[Vladimir V. Saveliev]

Hello

On Saturday 16 September 2006 16:25, Pawel Jagoda wrote:
> Hello.
> 
> I've backup my data - one file, which have 4060 MB. Unfortunetly I didn't
> point out that my destination file system is in old 3.5.x version. And of
> course I cannot read my data after 2GB (it says: Input/Output Error). I
> have converted my filesystem into 3.6.x, but still I'm not able to read
> this file. But if I create new file (for example: dd if=/dev/zero
> of=/mnt/hda3/some_file bs=1M count=3000), there is no problem to read it.
> Is it possible, to do something to restore my backup from this file? If
> yes, then how can I do it?
> 

Which kernel did you use?

> 
> Paul.
> 
> 
> 

Re: Files > 2GB and 3.6 version (after converting from 3.5)

[Pawel Jagoda]

> Hello
>
> On Saturday 16 September 2006 16:25, Pawel Jagoda wrote:
>> Hello.
>>
>> I've backup my data - one file, which have 4060 MB. Unfortunetly I
>> didn't
>> point out that my destination file system is in old 3.5.x version. And
>> of
>> course I cannot read my data after 2GB (it says: Input/Output Error). I
>> have converted my filesystem into 3.6.x, but still I'm not able to read
>> this file. But if I create new file (for example: dd if=/dev/zero
>> of=/mnt/hda3/some_file bs=1M count=3000), there is no problem to read
>> it.
>> Is it possible, to do something to restore my backup from this file? If
>> yes, then how can I do it?
>>
>
> Which kernel did you use?
>

2.6.14.7

Re: Files > 2GB and 3.6 version (after converting from 3.5)

[Vladimir V. Saveliev]

Hello

On Monday 18 September 2006 01:20, Pawel Jagoda wrote:
> > Hello
> >
> > On Saturday 16 September 2006 16:25, Pawel Jagoda wrote:
> >> Hello.
> >>
> >> I've backup my data - one file, which have 4060 MB. Unfortunetly I
> >> didn't
> >> point out that my destination file system is in old 3.5.x version. And
> >> of
> >> course I cannot read my data after 2GB (it says: Input/Output Error). I
> >> have converted my filesystem into 3.6.x, but still I'm not able to read
> >> this file. But if I create new file (for example: dd if=/dev/zero
> >> of=/mnt/hda3/some_file bs=1M count=3000), there is no problem to read
> >> it.
> >> Is it possible, to do something to restore my backup from this file? If
> >> yes, then how can I do it?
> >>
> >
> > Which kernel did you use?
> >
> 
> 2.6.14.7
> 
> 

Please try whether the attached patch helps.


diff -puN fs/reiserfs/inode.c~reiserfs-debug-read fs/reiserfs/inode.c



diff -puN fs/reiserfs/inode.c~reiserfs-read-4gb-files fs/reiserfs/inode.c
--- linux-2.6.14.7/fs/reiserfs/inode.c~reiserfs-read-4gb-files	2006-09-19 01:41:46.000000000 +0400
+++ linux-2.6.14.7-vs/fs/reiserfs/inode.c	2006-09-19 01:41:46.000000000 +0400
@@ -206,7 +206,7 @@ static inline void set_block_dev_mapped(
 static int file_capable(struct inode *inode, long block)
 {
 	if (get_inode_item_key_version(inode) != KEY_FORMAT_3_5 ||	// it is new file.
-	    block < (1 << (31 - inode->i_sb->s_blocksize_bits)))	// old file, but 'block' is inside of 2gb
+	    block < (1 << (32 - inode->i_sb->s_blocksize_bits)))	// old file, but 'block' is inside of 2gb
 		return 1;
 
 	return 0;

_

Re: Files > 2GB and 3.6 version (after converting from 3.5)

[Jeff Mahoney]

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Pawel Jagoda wrote:
> Hello.
> 
> I've backup my data - one file, which have 4060 MB. Unfortunetly I didn't
> point out that my destination file system is in old 3.5.x version. And of
> course I cannot read my data after 2GB (it says: Input/Output Error). I
> have converted my filesystem into 3.6.x, but still I'm not able to read
> this file. But if I create new file (for example: dd if=/dev/zero
> of=/mnt/hda3/some_file bs=1M count=3000), there is no problem to read it.
> Is it possible, to do something to restore my backup from this file? If
> yes, then how can I do it?

Unfortunately, if you've removed your backup of the original file, the
data is lost.

If you still have a copy of the original file, you can remove the copy
on the converted file system and replace it. The problem you're running
into is that converting a file system to v3.6 from v3.5 allows *new*
files to grow beyond the 2 GB limit, but not existing ones. The reason
for this is that converting the file system only indicates that it has
the ability to use files larger than that, but it doesn't update all the
existing files. If you create a new file, it uses the newer metadata
format that can describe much larger files.

- -Jeff

- --
Jeff Mahoney
SUSE Labs
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