linux-ext4 - Re: [PATCH 15/15][e2fsprogs] 64-bit mke2fs cleanup

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Date:	Wed, 16 Jul 2008 17:23:45 +0200
From:	Goswin von Brederlow <goswin-v-b@....de>
To:	"Jose R. Santos" <jrs@...ibm.com>
Cc:	Goswin von Brederlow <goswin-v-b@....de>,
	"Theodore Ts'o" <tytso@....edu>, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 15/15][e2fsprogs] 64-bit mke2fs cleanup

"Jose R. Santos" <jrs@...ibm.com> writes:

> On Wed, 16 Jul 2008 15:52:01 +0200
> Goswin von Brederlow <goswin-v-b@....de> wrote:
>> My test device is exactly 32 TiB large and gives the following:
>> 
>> root@...-13:~# LD_LIBRARY_PATH=/tmpa/ext4 /tmpa/ext4/mke2fs -T ext4dev
>> -j -m0 /dev/mapper/ext4
>> mke2fs 1.41.0 (10-Jul-2008)
>> mke2fs: inode_size (256) * inodes_count (0) too big for a
>>         filesystem with 0 blocks, specify higher inode_ratio (-i)
>>         or lower inode count (-N).
>
> hehe, I put a FIXME-64 around this since I knew it was going to be a
> problem.  I just wasn't sure what was the right approach for fixing.
> You'll have to specify an inode count for now.
>
> The "filesystem with 0 blocks" surprise me though.  Looks like I missed
> something somewhere.

/*
 * Set the fs block count
 */
void ext2fs_blocks_count_set(struct ext2_super_block *super, blk64_t blk)
{
        super->s_blocks_count = blk;
        if (super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT)
           super->s_blocks_count_hi = (__u64) blk >> 32;
}

EXT4_FEATURE_INCOMPAT_64BIT is not set so the upper bits just get
ignored.

MfG
        Goswin

PS: Should functions that chop off upper bits like that make sure they
are 0?
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