kernel.git/fs/ocfs2/cluster, branch linux-4.0.y

ocfs2: o2net: silence uninitialized variable warning

2015-02-10T22:30:29Z

Smatch complains that, if o2net_tx_can_proceed() returns false, then "sc" and "ret" are uninialized or maybe we are re-using the data from previous iteration. I do not know if we can hit this bug in real life but checking the return value is harmless and we may as well silence the static checker warning. Signed-off-by: Dan Carpenter Cc: Mark Fasheh Cc: Joel Becker Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

ocfs2: fix wrong comment

2015-02-10T22:30:28Z

O2NET_CONN_IDLE_DELAY is not defined, connection attempts will not be canceled due to timeout. Signed-off-by: Junxiao Bi Cc: Mark Fasheh Cc: Joel Becker Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

ocfs2: o2net: fix connect expired

2014-12-11T01:41:03Z

Set nn_persistent_error to -ENOTCONN will stop reconnect since the "stop" condition in o2net_start_connect() will be true. stop = (nn->nn_sc || (nn->nn_persistent_error && (nn->nn_persistent_error != -ENOTCONN || timeout == 0))); This will make connection never be established if the first connection request is lost. Set nn_persistent_error to 0 when connect expired to fix this. With this changes, dlm will not be waken up when connect expired, this is OK since dlm depends on network, dlm can do nothing in this case if waken up. Let it wait there for network recover and connect built again to continue. Signed-off-by: Junxiao Bi Reviewed-by: Srinivas Eeda Cc: Joel Becker Cc: Mark Fasheh Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

ocfs2: report error from o2hb_do_disk_heartbeat() to user

2014-12-11T01:41:03Z

Report return value of o2hb_do_disk_heartbeat() as a part of ML_HEARTBEAT message so that we know whether a heartbeat actually happened or not. This also makes assigned but otherwise unused 'ret' variable used. Coverity id: 1227053. Signed-off-by: Jan Kara Cc: Mark Fasheh Cc: Joel Becker Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

fix breakage in o2net_send_tcp_msg()

2014-11-05T20:21:18Z

uninitialized msghdr. Broken in "ocfs2: don't open-code kernel_recvmsg()" by me ;-/ Cc: stable@vger.kernel.org # 3.15+ Signed-off-by: Al Viro

ocfs2: replace strnicmp with strncasecmp

2014-10-14T00:18:24Z

The kernel used to contain two functions for length-delimited, case-insensitive string comparison, strnicmp with correct semantics and a slightly buggy strncasecmp. The latter is the POSIX name, so strnicmp was renamed to strncasecmp, and strnicmp made into a wrapper for the new strncasecmp to avoid breaking existing users. To allow the compat wrapper strnicmp to be removed at some point in the future, and to avoid the extra indirection cost, do s/strnicmp/strncasecmp/g. Signed-off-by: Rasmus Villemoes Cc: Mark Fasheh Cc: Joel Becker Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

ocfs2: fix a deadlock while o2net_wq doing direct memory reclaim

2014-10-10T02:25:58Z

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 Cc: Junxiao Bi Cc: Joel Becker Cc: Mark Fasheh Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

ocfs2: fix deadlock between o2hb thread and o2net_wq

2014-10-10T02:25:47Z

The following case may lead to o2net_wq and o2hb thread deadlock on o2hb_callback_sem. Currently there are 2 nodes say N1, N2 in the cluster. And N2 down, at the same time, N3 tries to join the cluster. So N1 will handle node down (N2) and join (N3) simultaneously. o2hb o2net_wq ->o2hb_do_disk_heartbeat ->o2hb_check_slot ->o2hb_run_event_list ->o2hb_fire_callbacks ->down_write(&o2hb_callback_sem) ->o2net_hb_node_down_cb ->flush_workqueue(o2net_wq) ->o2net_process_message ->dlm_query_join_handler ->o2hb_check_node_heartbeating ->o2hb_fill_node_map ->down_read(&o2hb_callback_sem) No need to take o2hb_callback_sem in dlm_query_join_handler, o2hb_live_lock is enough to protect live node map. Signed-off-by: Joseph Qi Cc: xMark Fasheh Cc: Joel Becker Cc: jiangyiwen Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

ocfs2: don't fire quorum before connection established

2014-10-10T02:25:47Z

Firing quorum before connection established can cause unexpected node to reboot. Assume there are 3 nodes in the cluster, Node 1, 2, 3. Node 2 and 3 have wrong ip address of Node 1 in cluster.conf and global heartbeat is enabled in the cluster. After the heatbeats are started on these three nodes, Node 1 will reboot due to quorum fencing. It is similar case if Node 1's networking is not ready when starting the global heartbeat. The reboot is not friendly as customer is not fully ready for ocfs2 to work. Fix it by not allowing firing quorum before the connection is established. In this case, ocfs2 will wait until the wrong configuration is fixed or networking is up to continue. Also update the log to guide the user where to check when connection is not built for a long time. Signed-off-by: Junxiao Bi Reviewed-by: Srinivas Eeda Cc: Joel Becker Cc: Mark Fasheh Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

fs/ocfs2/cluster/netdebug.c: use seq_open_private() not seq_open()

2014-10-10T02:25:47Z

Reduce boilerplate code by using seq_open_private() instead of seq_open() Note that the code in and using sc_common_open() has been quite extensively changed. Not least because there was a latent memory leak in the code as was: if sc_common_open() failed, the previously allocated buffer was not freed. Signed-off-by: Rob Jones Cc: Joel Becker Cc: Mark Fasheh Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds