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Date:	Tue, 12 Jun 2007 09:57:57 -0500
From:	"Jose R. Santos" <jrs@...ibm.com>
To:	"Jose R. Santos" <jrs@...ibm.com>
Cc:	Valerie Clement <valerie.clement@...l.net>,
	Theodore Tso <tytso@....edu>,
	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: [RFC][PATCH 4/12] convert some block types in e2fsprogs

On Mon, 11 Jun 2007 15:59:30 -0500
"Jose R. Santos" <jrs@...ibm.com> wrote:

> On Mon, 11 Jun 2007 18:42:28 +0200
> Valerie Clement <valerie.clement@...l.net> wrote:
> 
> > This patch converts some int or unsigned int block number definitions
> > to blk_t type.  Most conversions are necessary for 64-bit porting.
> 
> What about unsigned long?  There are various places where block is
> represented by using unsigned long which is 32-bit when running 32 bit
> binaries. Most PPC64 distributions compile their user-space tools in
> 32-bit binaries.
> 
> I wonder how badly it will break.

I found a PPC64 box to test this out and it seems to break pretty badly
when compiled in the default 32bit mode.  Should ext2_get_device_size()
fail if the number of block is greater than 2**32 and the size of
unsigned long is 4?  At least until it can be verified that this will
work under 32bit binaries since it could corrupt a filesystem to do
an fsck.

mke2fs 1.39-tyt3 (29-Apr-2007)

Warning:Filesystem greater than 2**32 blocks, 64-bit incompatible feature forced.

Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
4194304 inodes, 5 blocks
0 blocks (0.00%) reserved for the super user
First data block=1
524288 block groups
8192 blocks per group, 8192 fragments per group
8 inodes per group
Superblock backups stored on blocks: 
        267387660, 267387660, 267387660, 267387660, 267387660, 267387660, 267387660, 267387660, 267387660, 
        267387660, 267387660, 267387660, 267387660, 267387660, 267387660, 267387660, 
        267387660, 267387660, 267387660, 267387660, 267387660, 267387660, 
        267387660, 267387660, 267387660, 267387660

mke2fs: Could not allocate block in ext2 filesystem while trying to allocate filesystem tables


-JRS
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