linux-ext4 - How to insure ext4_alloc_blocks always returns blocks below 0xffffffff when using indirect index.

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Date:	Fri, 3 Aug 2007 10:22:31 +0800
From:	"Yan Zheng" <yanzheng@...n.com>
To:	linux-ext4@...r.kernel.org
Subject: How to insure ext4_alloc_blocks always returns blocks below 0xffffffff when using indirect index.

Hi all.

Druing reading the source codes of indirect index,  there is a doubt
in my mind. When using indirect index, physical block number must not
exceed 0xffffffff, but I cann' t find any clue  about how
ext4_alloc_blocks insure that.  Codes that check 64bit_feature is only
in ext4_fill_super and they do nothing affects block allocation
algorithm.  Maybe ext4_alloc_blocks should  check whether inode has
EXT4_EXTENTS_FL flags and only search block groups that have blocks
below 0xffffffff when not.

The source codes I read is 2.6.22.

Thanks in advance.
YZ
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