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| author | Joel Becker <joel.becker@oracle.com> | 2007-02-06 15:45:39 -0800 |
|---|---|---|
| committer | Mark Fasheh <mark.fasheh@oracle.com> | 2007-07-10 17:19:46 -0700 |
| commit | e6df3a663a5d1ee68aeae7f007197f272700d9cc (patch) | |
| tree | e484382e0ae46553febd3dd56c0f8a9e882ec71b | |
| parent | 16c6a4f24de2933b26477ad5dfb71f518220d641 (diff) | |
| download | linux-e6df3a663a5d1ee68aeae7f007197f272700d9cc.tar.gz linux-e6df3a663a5d1ee68aeae7f007197f272700d9cc.tar.bz2 linux-e6df3a663a5d1ee68aeae7f007197f272700d9cc.zip | |
ocfs2: Wake up a starting region if it gets killed in the background.
Tell o2cb_region_dev_write() to wake up if rmdir(2) happens on the
heartbeat region while it is starting up. Then o2hb_region_dev_write()
can check to see if it is alive and act accordingly. This prevents a hang
(not being woken) and a crash (if it's woken by a signal).
Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
| -rw-r--r-- | fs/ocfs2/cluster/heartbeat.c | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c index 2877d468f115..2bd7f788cf34 100644 --- a/fs/ocfs2/cluster/heartbeat.c +++ b/fs/ocfs2/cluster/heartbeat.c @@ -1335,6 +1335,7 @@ static ssize_t o2hb_region_dev_write(struct o2hb_region *reg, ret = wait_event_interruptible(o2hb_steady_queue, atomic_read(®->hr_steady_iterations) == 0); if (ret) { + /* We got interrupted (hello ptrace!). Clean up */ spin_lock(&o2hb_live_lock); hb_task = reg->hr_task; reg->hr_task = NULL; @@ -1345,7 +1346,16 @@ static ssize_t o2hb_region_dev_write(struct o2hb_region *reg, goto out; } - ret = count; + /* Ok, we were woken. Make sure it wasn't by drop_item() */ + spin_lock(&o2hb_live_lock); + hb_task = reg->hr_task; + spin_unlock(&o2hb_live_lock); + + if (hb_task) + ret = count; + else + ret = -EIO; + out: if (filp) fput(filp); @@ -1523,6 +1533,15 @@ static void o2hb_heartbeat_group_drop_item(struct config_group *group, if (hb_task) kthread_stop(hb_task); + /* + * If we're racing a dev_write(), we need to wake them. They will + * check reg->hr_task + */ + if (atomic_read(®->hr_steady_iterations) != 0) { + atomic_set(®->hr_steady_iterations, 0); + wake_up(&o2hb_steady_queue); + } + config_item_put(item); } |