linux-kernel - [PATCH 2.6.30-stable] jfs: fix regression preventing coalescing of extents

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Message-Id: <1245245721.7926.4.camel@norville.austin.ibm.com>
Date:	Wed, 17 Jun 2009 08:35:21 -0500
From:	Dave Kleikamp <shaggy@...ux.vnet.ibm.com>
To:	"stable@...nel.org" <stable@...nel.org>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 2.6.30-stable] jfs: fix regression preventing coalescing of
 extents

Please pick up this patch for the 2.6.30 stable branch.  It has been
committed to mainline as f7c52fd17a7dda42fc9e88c2b2678403419bfe63.

Commit fec1878fe952b994125a3be7c94b1322db586f3b caused a regression in
which contiguous blocks being allocated to the end of an extent were
getting a new extent created.  This typically results in files entirely
made up of 1-block extents even though the blocks are contiguous on
disk.

Apparently grub doesn't handle a jfs file being fragmented into too many
extents, since it refuses to boot a kernel from jfs that was created by
the 2.6.30 kernel.

Signed-off-by: Dave Kleikamp <shaggy@...ux.vnet.ibm.com>
Reported-by: Alex <alevkovich@....by>

diff --git a/fs/jfs/jfs_extent.c b/fs/jfs/jfs_extent.c
index bbbd5f2..41d6045 100644
--- a/fs/jfs/jfs_extent.c
+++ b/fs/jfs/jfs_extent.c
@@ -391,6 +391,7 @@ int extHint(struct inode *ip, s64 offset, xad_t * xp)
 		}
 		XADaddress(xp, xaddr);
 		XADlength(xp, xlen);
+		XADoffset(xp, prev);
 		/*
 		 * only preserve the abnr flag within the xad flags
 		 * of the returned hint.

-- 
David Kleikamp
IBM Linux Technology Center

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