linux-ext4 - Re: max file size for ext3

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Date:	Wed, 10 Oct 2007 11:49:38 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Mingming Cao <cmm@...ibm.com>
CC:	linux-ext4 <linux-ext4@...r.kernel.org>
Subject: Re: max file size for ext3

This is what i have now . But still i am not able to map the magic number

#include <stdio.h>
main()
{
	unsigned long long upper_limit;
	int meta_blocks;
	int bits = 12;

	/* total blocks in 512 bytes */
	upper_limit = (1LL << 32) -1;
	/* total blocks in file system block size */
	upper_limit >>= (bits - 9);


	/* indirect blocks */
	meta_blocks = 1;
	/* double indirect blocks */
	meta_blocks += 1 + (1LL << (bits-2));
	/* tripple indirect blocks */
	meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));

	upper_limit -= meta_blocks;
	upper_limit <<= bits;

	printf("expected %llx %llx\n",0x1ff7fffd000LL, upper_limit);
}

expected 1ff7fffd000 1feff7fc000
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