linux-ext4 - [PATCH] ext4: add checksum calculation when clearing UNINIT flag

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Date:	Fri, 07 Nov 2008 11:22:56 +0100
From:	Frédéric Bohé <frederic.bohe@...l.net>
To:	linux-ext4 <linux-ext4@...r.kernel.org>
Subject: [PATCH] ext4: add checksum calculation when clearing UNINIT flag

From: Frederic Bohe <frederic.bohe@...l.net>

Block group's checksum need to be re-calculated during the
initialization of an UNINIT'd group. This fix a race when several
threads try to allocate a new inode in an UNINIT'd group.

Signed-off-by: Frederic Bohe <frederic.bohe@...l.net>
---
 ialloc.c |    2 ++
 1 file changed, 2 insertions(+)

Index: linux/fs/ext4/ialloc.c
===================================================================
--- linux.orig/fs/ext4/ialloc.c	2008-11-06 17:22:14.000000000 +0100
+++ linux/fs/ext4/ialloc.c	2008-11-07 10:43:41.000000000 +0100
@@ -718,6 +718,8 @@ got:
 			gdp->bg_flags &= cpu_to_le16(~EXT4_BG_BLOCK_UNINIT);
 			free = ext4_free_blocks_after_init(sb, group, gdp);
 			gdp->bg_free_blocks_count = cpu_to_le16(free);
+			gdp->bg_checksum = ext4_group_desc_csum(sbi, group,
+								gdp);
 		}
 		spin_unlock(sb_bgl_lock(sbi, group));
--
 


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