linux-kernel - [PATCH 4.9 190/206] xfs: pass state not whichfork to trace_xfs

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Message-Id: <20170110131511.738028001@linuxfoundation.org>
Date:   Tue, 10 Jan 2017 14:37:53 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Eric Sandeen <sandeen@...hat.com>,
        Christoph Hellwig <hch@....de>,
        Dave Chinner <david@...morbit.com>
Subject: [PATCH 4.9 190/206] xfs: pass state not whichfork to trace_xfs_extlist

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------


From: Eric Sandeen <sandeen@...deen.net>

commit 7710517fc37b1899722707883b54694ea710b3c0 upstream.

When xfs_bmap_trace_exlist called trace_xfs_extlist,
it sent in the "whichfork" var instead of the bmap "state"
as expected (even though state was already set up for this
purpose).

As a result, the xfs_bmap_class in tracing code used
"whichfork" not state in xfs_iext_state_to_fork(), and got
the wrong ifork pointer.  It all goes downhill from
there, including an ASSERT when ifp_bytes is empty
by the time it reaches xfs_iext_get_ext():

XFS: Assertion failed: idx < ifp->if_bytes / sizeof(xfs_bmbt_rec_t)

Signed-off-by: Eric Sandeen <sandeen@...hat.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Signed-off-by: Dave Chinner <david@...morbit.com>
Cc: Christoph Hellwig <hch@....de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/xfs/libxfs/xfs_bmap.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/xfs/libxfs/xfs_bmap.c
+++ b/fs/xfs/libxfs/xfs_bmap.c
@@ -531,7 +531,7 @@ xfs_bmap_trace_exlist(
 	ifp = XFS_IFORK_PTR(ip, whichfork);
 	ASSERT(cnt == xfs_iext_count(ifp));
 	for (idx = 0; idx < cnt; idx++)
-		trace_xfs_extlist(ip, idx, whichfork, caller_ip);
+		trace_xfs_extlist(ip, idx, state, caller_ip);
 }
 
 /*