diff options
| author | Joseph Qi <joseph.qi@huawei.com> | 2015-11-05 18:44:07 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-11-05 19:34:48 -0800 |
| commit | 0986fe9b50f425ec81f25a1a85aaf3574b31d801 (patch) | |
| tree | f8308dd1893755a7dcb852126efcb3625ea5e113 /fs | |
| parent | 93d911fcce259a3f950ee20592beee31b855cd96 (diff) | |
| download | linux-0986fe9b50f425ec81f25a1a85aaf3574b31d801.tar.bz2 | |
ocfs2: fix race between mount and delete node/cluster
There is a race case between mount and delete node/cluster, which will
lead o2hb_thread to malfunctioning dead loop.
o2hb_thread
{
o2nm_depend_this_node();
<<<<<< race window, node may have already been deleted, and then
enter the loop, o2hb thread will be malfunctioning
because of no configured nodes found.
while (!kthread_should_stop() &&
!reg->hr_unclean_stop && !reg->hr_aborted_start) {
}
So check the return value of o2nm_depend_this_node() is needed. If node
has been deleted, do not enter the loop and let mount fail.
Signed-off-by: Joseph Qi <joseph.qi@huawei.com>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/ocfs2/cluster/heartbeat.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c index fa15debcc02b..ddddef0021a0 100644 --- a/fs/ocfs2/cluster/heartbeat.c +++ b/fs/ocfs2/cluster/heartbeat.c @@ -219,7 +219,8 @@ struct o2hb_region { unsigned hr_unclean_stop:1, hr_aborted_start:1, hr_item_pinned:1, - hr_item_dropped:1; + hr_item_dropped:1, + hr_node_deleted:1; /* protected by the hr_callback_sem */ struct task_struct *hr_task; @@ -1078,7 +1079,13 @@ static int o2hb_thread(void *data) set_user_nice(current, MIN_NICE); /* Pin node */ - o2nm_depend_this_node(); + ret = o2nm_depend_this_node(); + if (ret) { + mlog(ML_ERROR, "Node has been deleted, ret = %d\n", ret); + reg->hr_node_deleted = 1; + wake_up(&o2hb_steady_queue); + return 0; + } while (!kthread_should_stop() && !reg->hr_unclean_stop && !reg->hr_aborted_start) { @@ -1787,7 +1794,8 @@ static ssize_t o2hb_region_dev_write(struct o2hb_region *reg, spin_unlock(&o2hb_live_lock); ret = wait_event_interruptible(o2hb_steady_queue, - atomic_read(®->hr_steady_iterations) == 0); + atomic_read(®->hr_steady_iterations) == 0 || + reg->hr_node_deleted); if (ret) { atomic_set(®->hr_steady_iterations, 0); reg->hr_aborted_start = 1; @@ -1798,6 +1806,11 @@ static ssize_t o2hb_region_dev_write(struct o2hb_region *reg, goto out3; } + if (reg->hr_node_deleted) { + ret = -EINVAL; + goto out3; + } + /* Ok, we were woken. Make sure it wasn't by drop_item() */ spin_lock(&o2hb_live_lock); hb_task = reg->hr_task; |