linux-ext4 - [patch (for 2.6.26?) 1/1] ext4: fix online resize bug

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Message-Id: <200806092349.m59NnMZh015687@imap1.linux-foundation.org>
Date:	Mon, 09 Jun 2008 16:49:22 -0700
From:	akpm@...ux-foundation.org
To:	tytso@....edu
Cc:	cmm@...ibm.com, akpm@...ux-foundation.org, jbacik@...hat.com,
	adilger@....com, linux-ext4@...r.kernel.org
Subject: [patch (for 2.6.26?) 1/1] ext4: fix online resize bug

From: Josef Bacik <jbacik@...hat.com>

There is a bug when we are trying to verify that the reserve inode's
double indirect blocks point back to the primary gdt blocks.  The fix is
obvious, we need to mod the gdb count by the addr's per block.  This was
verified using the same testcase as with the ext3 equivalent of this
patch.

Signed-off-by: Josef Bacik <jbacik@...hat.com>
Cc: <linux-ext4@...r.kernel.org>
Acked-by: Andreas Dilger <adilger@....com>
Cc: Mingming Cao <cmm@...ibm.com>
Acked-by: Theodore Ts'o <tytso@....edu>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 fs/ext4/resize.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff -puN fs/ext4/resize.c~ext4-fix-online-resize-bug fs/ext4/resize.c
--- a/fs/ext4/resize.c~ext4-fix-online-resize-bug
+++ a/fs/ext4/resize.c
@@ -563,7 +563,8 @@ static int reserve_backup_gdb(handle_t *
 	}
 
 	blk = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + EXT4_SB(sb)->s_gdb_count;
-	data = (__le32 *)dind->b_data + EXT4_SB(sb)->s_gdb_count;
+	data = (__le32 *)dind->b_data + (EXT4_SB(sb)->s_gdb_count %
+					 EXT4_ADDR_PER_BLOCK(sb));
 	end = (__le32 *)dind->b_data + EXT4_ADDR_PER_BLOCK(sb);
 
 	/* Get each reserved primary GDT block and verify it holds backups */
_
--
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