linux-ext4 - [PATCH][e2fsprogs][mke2fs] fix FLEX

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Date:	Thu, 03 Jul 2008 10:21:02 +0200
From:	Celine Bourde <celine.bourde@...l.net>
To:	linux-ext4@...r.kernel.org, "Jose R. Santos" <jrs@...ibm.com>,
	cmm@...ibm.com,
	Frédéric Bohé <frederic.bohe@...l.net>
Cc:	SOLOFO RAMANGALAHY <Solofo.Ramangalahy@...l.net>,
	Jean-Pierre Dion <jean-pierre.dion@...l.net>
Subject: [PATCH][e2fsprogs][mke2fs] fix FLEX_BG offset

This patch resolves the offset problem of the flex_bg
option when you use mke2fs tool.

For example, if you type mkfs.ext4 -I256 -O flex_bg -G32 -E test_fs <device>
and look dumpe2fs <device> result you will see an offset problem.

Group 0: (Blocks 0-32767)
Primary superblock at 0, Group descriptors at 1-5
Reserved GDT blocks at 6-1024
Block bitmap at 1025 (+1025), Inode bitmap at 1058 (+1058)
Inode table at 1090-1601 (+1090)
0 free blocks, 8181 free inodes, 2 directories
Free blocks:
Free inodes: 12-8192

Inode bitmap must start at 1025 + 32 = 1057
In all flexbg groups, the block between the last block bitmap and the 
first inode
bitmap (metatdata) is not used, which introduced a hole.

This patch corrects it.
You have to apply it on e2fsprogs (mke2fs 1.41-WIP (17-Jun-2008)) master 
branch.

Celine Bourde.

View attachment "flexbg_offset.patch" of type "text/x-patch" (740 bytes)