ocfs2: fix a deadlock while o2net_wq doing direct memory reclaim

Fix a deadlock problem caused by direct memory reclaim in o2net_wq.  The
situation is as follows:

1) Receive a connect message from another node, node queues a
   work_struct o2net_listen_work.

2) o2net_wq processes this work and call the following functions:

o2net_wq
-> o2net_accept_one
  -> sock_create_lite
    -> sock_alloc()
      -> kmem_cache_alloc with GFP_KERNEL
        -> ____cache_alloc_node
          ->__alloc_pages_nodemask
            -> do_try_to_free_pages
              -> shrink_slab
                -> evict
                  -> ocfs2_evict_inode
                    -> ocfs2_drop_lock
                      -> dlmunlock
                        -> o2net_send_message_vec

   then o2net_wq wait for the unlock reply from master.

3) tcp layer received the reply, call o2net_data_ready() and queue
   sc_rx_work, waiting o2net_wq to process this work.

4) o2net_wq is a single thread workqueue, it process the work one by
   one.  Right now it is still doing o2net_listen_work and cannot handle
   sc_rx_work.  so we deadlock.

Junxiao Bi's patch "mm: clear __GFP_FS when PF_MEMALLOC_NOIO is set"
(http://ozlabs.org/~akpm/mmots/broken-out/mm-clear-__gfp_fs-when-pf_memalloc_noio-is-set.patch)
clears __GFP_FS in memalloc_noio_flags() besides __GFP_IO.  We use
memalloc_noio_save() to set process flag PF_MEMALLOC_NOIO so that all
allocations done by this process are done as if GFP_NOIO was specified.
We are not reentering filesystem while doing memory reclaim.

Signed-off-by: joyce.xue <xuejiufei@huawei.com>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Mark Fasheh <mfasheh@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/ocfs2/cluster/tcp.c b/fs/ocfs2/cluster/tcp.c
index 509e6d5415e23eb99a690e61f014e4e20007f649..97de0fbd9f784196312d2330b34e43873b6c6ecc 100644 (file)
--- a/fs/ocfs2/cluster/tcp.c
+++ b/fs/ocfs2/cluster/tcp.c
@@ -1601,7 +1601,15 @@ static void o2net_start_connect(struct work_struct *work)
        struct sockaddr_in myaddr = {0, }, remoteaddr = {0, };
        int ret = 0, stop;
        unsigned int timeout;
+       unsigned int noio_flag;
 
+       /*
+        * sock_create allocates the sock with GFP_KERNEL. We must set
+        * per-process flag PF_MEMALLOC_NOIO so that all allocations done
+        * by this process are done as if GFP_NOIO was specified. So we
+        * are not reentering filesystem while doing memory reclaim.
+        */
+       noio_flag = memalloc_noio_save();
        /* if we're greater we initiate tx, otherwise we accept */
        if (o2nm_this_node() <= o2net_num_from_nn(nn))
                goto out;
@@ -1710,6 +1718,7 @@ out:
        if (mynode)
                o2nm_node_put(mynode);
 
+       memalloc_noio_restore(noio_flag);
        return;
 }
 
@@ -1836,6 +1845,15 @@ static int o2net_accept_one(struct socket *sock, int *more)
        struct o2nm_node *local_node = NULL;
        struct o2net_sock_container *sc = NULL;
        struct o2net_node *nn;
+       unsigned int noio_flag;
+
+       /*
+        * sock_create_lite allocates the sock with GFP_KERNEL. We must set
+        * per-process flag PF_MEMALLOC_NOIO so that all allocations done
+        * by this process are done as if GFP_NOIO was specified. So we
+        * are not reentering filesystem while doing memory reclaim.
+        */
+       noio_flag = memalloc_noio_save();
 
        BUG_ON(sock == NULL);
        *more = 0;
@@ -1952,6 +1970,8 @@ out:
                o2nm_node_put(local_node);
        if (sc)
                sc_put(sc);
+
+       memalloc_noio_restore(noio_flag);
        return ret;
 }