tree 46f2081646866cea4f89d8f20c5f632f14e3bc2a
parent aa0467d8d2a00e75b2bb6a56a4ee6d70c5d1928f
author Josef Bacik <josef@redhat.com> 1307558750 -0400
committer Arne Jansen <sensille@gmx.net> 1307700852 +0200

Btrfs: don't map extent buffer if path->skip_locking is set

Arne's scrub stuff exposed a problem with mapping the extent buffer in
reada_for_search.  He searches the commit root with multiple threads and with
skip_locking set, so we can race and overwrite node->map_token since node isn't
locked.  So fix this so that we only map the extent buffer if we don't already
have a map_token and skip_locking isn't set.  Without this patch scrub would
panic almost immediately, with the patch it doesn't panic anymore.  Thanks,

Reported-by: Arne Jansen <sensille@gmx.net>
Signed-off-by: Josef Bacik <josef@redhat.com>