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authorDavid Teigland <teigland@redhat.com>2007-05-29 08:46:00 -0500
committerSteven Whitehouse <swhiteho@redhat.com>2007-07-09 08:22:54 +0100
commit8b4021fa436f7c76a2299e6d85d4d4a619724e9a (patch)
tree4e3be51910ede8a36d640229bb1d20d3f7547652 /fs/dlm/user.c
parent84d8cd69a8e7f1c9962f46bc79850c9f1f663806 (diff)
[DLM] canceling deadlocked lock
Add a function that can be used through libdlm by a system daemon to cancel another process's deadlocked lock. A completion ast with EDEADLK is returned to the process waiting for the lock. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/dlm/user.c')
-rw-r--r--fs/dlm/user.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/fs/dlm/user.c b/fs/dlm/user.c
index 329da1b5285..6438941ab1f 100644
--- a/fs/dlm/user.c
+++ b/fs/dlm/user.c
@@ -156,6 +156,7 @@ static int lkb_is_endoflife(struct dlm_lkb *lkb, int sb_status, int type)
return 1;
case -DLM_ECANCEL:
case -ETIMEDOUT:
+ case -EDEADLK:
if (lkb->lkb_grmode == DLM_LOCK_IV)
return 1;
break;
@@ -320,6 +321,22 @@ static int device_user_unlock(struct dlm_user_proc *proc,
return error;
}
+static int device_user_deadlock(struct dlm_user_proc *proc,
+ struct dlm_lock_params *params)
+{
+ struct dlm_ls *ls;
+ int error;
+
+ ls = dlm_find_lockspace_local(proc->lockspace);
+ if (!ls)
+ return -ENOENT;
+
+ error = dlm_user_deadlock(ls, params->flags, params->lkid);
+
+ dlm_put_lockspace(ls);
+ return error;
+}
+
static int create_misc_device(struct dlm_ls *ls, char *name)
{
int error, len;
@@ -545,6 +562,14 @@ static ssize_t device_write(struct file *file, const char __user *buf,
error = device_user_unlock(proc, &kbuf->i.lock);
break;
+ case DLM_USER_DEADLOCK:
+ if (!proc) {
+ log_print("no locking on control device");
+ goto out_sig;
+ }
+ error = device_user_deadlock(proc, &kbuf->i.lock);
+ break;
+
case DLM_USER_CREATE_LOCKSPACE:
if (proc) {
log_print("create/remove only on control device");