xfs: fix reading of wrapped log data
authorDave Chinner <dchinner@redhat.com>
Fri, 2 Nov 2012 00:38:44 +0000 (11:38 +1100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sat, 17 Nov 2012 21:19:06 +0000 (13:19 -0800)
commit373296d1087d33a5ece7b898a54532e558760009
tree08ddc365063cdd8055446c4d2ea5fd2d0cd83ae7
parentf4c27fc8bffdb18f1e78c6cd25264a0880b39010
xfs: fix reading of wrapped log data

commit 6ce377afd1755eae5c93410ca9a1121dfead7b87 upstream.

Commit 4439647 ("xfs: reset buffer pointers before freeing them") in
3.0-rc1 introduced a regression when recovering log buffers that
wrapped around the end of log. The second part of the log buffer at
the start of the physical log was being read into the header buffer
rather than the data buffer, and hence recovery was seeing garbage
in the data buffer when it got to the region of the log buffer that
was incorrectly read.

Reported-by: Torsten Kaiser <just.for.lkml@googlemail.com>
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
fs/xfs/xfs_log_recover.c