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authorDavid Teigland <teigland@redhat.com>2008-08-18 11:43:30 -0500
committerDavid Teigland <teigland@redhat.com>2008-08-28 11:49:43 -0500
commitdc68c7ed362a00a48290252573a8eb9f74463c3a (patch)
tree99b8b64ea08d4990373d09e01b7bac2566ad3879 /fs/dlm/lockspace.c
parent0f8e0d9a317406612700426fad3efab0b7bbc467 (diff)
dlm: detect available userspace daemon
If dlm_controld (the userspace daemon that controls the setup and recovery of the dlm) fails, the kernel should shut down the lockspaces in the kernel rather than leaving them running. This is detected by having dlm_controld hold a misc device open while running, and if the kernel detects a close while the daemon is still needed, it stops the lockspaces in the kernel. Knowing that the userspace daemon isn't running also allows the lockspace create/remove routines to avoid waiting on the daemon for join/leave operations. Signed-off-by: David Teigland <teigland@redhat.com>
Diffstat (limited to 'fs/dlm/lockspace.c')
-rw-r--r--fs/dlm/lockspace.c24
1 files changed, 23 insertions, 1 deletions
diff --git a/fs/dlm/lockspace.c b/fs/dlm/lockspace.c
index 56eae4e4a95..ba672fe0a60 100644
--- a/fs/dlm/lockspace.c
+++ b/fs/dlm/lockspace.c
@@ -378,6 +378,11 @@ static int new_lockspace(char *name, int namelen, void **lockspace,
if (!try_module_get(THIS_MODULE))
return -EINVAL;
+ if (!dlm_user_daemon_available()) {
+ module_put(THIS_MODULE);
+ return -EUNATCH;
+ }
+
error = 0;
spin_lock(&lslist_lock);
@@ -669,7 +674,7 @@ static int release_lockspace(struct dlm_ls *ls, int force)
dlm_device_deregister(ls);
- if (force < 3)
+ if (force < 3 && dlm_user_daemon_available())
do_uevent(ls, 0);
dlm_recoverd_stop(ls);
@@ -791,3 +796,20 @@ int dlm_release_lockspace(void *lockspace, int force)
return error;
}
+void dlm_stop_lockspaces(void)
+{
+ struct dlm_ls *ls;
+
+ restart:
+ spin_lock(&lslist_lock);
+ list_for_each_entry(ls, &lslist, ls_list) {
+ if (!test_bit(LSFL_RUNNING, &ls->ls_flags))
+ continue;
+ spin_unlock(&lslist_lock);
+ log_error(ls, "no userland control daemon, stopping lockspace");
+ dlm_ls_stop(ls);
+ goto restart;
+ }
+ spin_unlock(&lslist_lock);
+}
+