int nlmclnt_proc(struct nlm_host *host, int cmd, struct file_lock *fl)
{
struct nlm_rqst *call;
- sigset_t oldset;
- unsigned long flags;
int status;
nlm_get_host(host);
/* Set up the argument struct */
nlmclnt_setlockargs(call, fl);
- /* Keep the old signal mask */
- spin_lock_irqsave(¤t->sighand->siglock, flags);
- oldset = current->blocked;
-
- /* If we're cleaning up locks because the process is exiting,
- * perform the RPC call asynchronously. */
- if ((IS_SETLK(cmd) || IS_SETLKW(cmd))
- && fl->fl_type == F_UNLCK
- && (current->flags & PF_EXITING)) {
- sigfillset(¤t->blocked); /* Mask all signals */
- recalc_sigpending();
-
- call->a_flags = RPC_TASK_ASYNC;
- }
- spin_unlock_irqrestore(¤t->sighand->siglock, flags);
-
if (IS_SETLK(cmd) || IS_SETLKW(cmd)) {
if (fl->fl_type != F_UNLCK) {
call->a_args.block = IS_SETLKW(cmd) ? 1 : 0;
fl->fl_ops->fl_release_private(fl);
fl->fl_ops = NULL;
- spin_lock_irqsave(¤t->sighand->siglock, flags);
- current->blocked = oldset;
- recalc_sigpending();
- spin_unlock_irqrestore(¤t->sighand->siglock, flags);
-
dprintk("lockd: clnt proc returns %d\n", status);
return status;
}
for(;;) {
call = kzalloc(sizeof(*call), GFP_KERNEL);
if (call != NULL) {
+ atomic_set(&call->a_count, 1);
locks_init_lock(&call->a_args.lock.fl);
locks_init_lock(&call->a_res.lock.fl);
call->a_host = host;
void nlm_release_call(struct nlm_rqst *call)
{
+ if (!atomic_dec_and_test(&call->a_count))
+ return;
nlm_release_host(call->a_host);
nlmclnt_release_lockargs(call);
kfree(call);
* Generic NLM call
*/
static int
-nlmclnt_call(struct nlm_rqst *req, u32 proc)
+nlmclnt_call(struct rpc_cred *cred, struct nlm_rqst *req, u32 proc)
{
struct nlm_host *host = req->a_host;
struct rpc_clnt *clnt;
struct rpc_message msg = {
.rpc_argp = argp,
.rpc_resp = resp,
+ .rpc_cred = cred,
};
int status;
/*
* Generic NLM call, async version.
*/
-static int __nlm_async_call(struct nlm_rqst *req, u32 proc, struct rpc_message *msg, const struct rpc_call_ops *tk_ops)
+static struct rpc_task *__nlm_async_call(struct nlm_rqst *req, u32 proc, struct rpc_message *msg, const struct rpc_call_ops *tk_ops)
{
struct nlm_host *host = req->a_host;
struct rpc_clnt *clnt;
+ struct rpc_task_setup task_setup_data = {
+ .rpc_message = msg,
+ .callback_ops = tk_ops,
+ .callback_data = req,
+ .flags = RPC_TASK_ASYNC,
+ };
dprintk("lockd: call procedure %d on %s (async)\n",
(int)proc, host->h_name);
if (clnt == NULL)
goto out_err;
msg->rpc_proc = &clnt->cl_procinfo[proc];
+ task_setup_data.rpc_client = clnt;
/* bootstrap and kick off the async RPC call */
- return rpc_call_async(clnt, msg, RPC_TASK_ASYNC, tk_ops, req);
+ return rpc_run_task(&task_setup_data);
out_err:
tk_ops->rpc_release(req);
- return -ENOLCK;
+ return ERR_PTR(-ENOLCK);
}
+static int nlm_do_async_call(struct nlm_rqst *req, u32 proc, struct rpc_message *msg, const struct rpc_call_ops *tk_ops)
+{
+ struct rpc_task *task;
+
+ task = __nlm_async_call(req, proc, msg, tk_ops);
+ if (IS_ERR(task))
+ return PTR_ERR(task);
+ rpc_put_task(task);
+ return 0;
+}
+
+/*
+ * NLM asynchronous call.
+ */
int nlm_async_call(struct nlm_rqst *req, u32 proc, const struct rpc_call_ops *tk_ops)
{
struct rpc_message msg = {
.rpc_argp = &req->a_args,
.rpc_resp = &req->a_res,
};
- return __nlm_async_call(req, proc, &msg, tk_ops);
+ return nlm_do_async_call(req, proc, &msg, tk_ops);
}
int nlm_async_reply(struct nlm_rqst *req, u32 proc, const struct rpc_call_ops *tk_ops)
struct rpc_message msg = {
.rpc_argp = &req->a_res,
};
- return __nlm_async_call(req, proc, &msg, tk_ops);
+ return nlm_do_async_call(req, proc, &msg, tk_ops);
+}
+
+/*
+ * NLM client asynchronous call.
+ *
+ * Note that although the calls are asynchronous, and are therefore
+ * guaranteed to complete, we still always attempt to wait for
+ * completion in order to be able to correctly track the lock
+ * state.
+ */
+static int nlmclnt_async_call(struct rpc_cred *cred, struct nlm_rqst *req, u32 proc, const struct rpc_call_ops *tk_ops)
+{
+ struct rpc_message msg = {
+ .rpc_argp = &req->a_args,
+ .rpc_resp = &req->a_res,
+ .rpc_cred = cred,
+ };
+ struct rpc_task *task;
+ int err;
+
+ task = __nlm_async_call(req, proc, &msg, tk_ops);
+ if (IS_ERR(task))
+ return PTR_ERR(task);
+ err = rpc_wait_for_completion_task(task);
+ rpc_put_task(task);
+ return err;
}
/*
{
int status;
- status = nlmclnt_call(req, NLMPROC_TEST);
+ status = nlmclnt_call(nfs_file_cred(fl->fl_file), req, NLMPROC_TEST);
if (status < 0)
goto out;
* Report the conflicting lock back to the application.
*/
fl->fl_start = req->a_res.lock.fl.fl_start;
- fl->fl_end = req->a_res.lock.fl.fl_start;
+ fl->fl_end = req->a_res.lock.fl.fl_end;
fl->fl_type = req->a_res.lock.fl.fl_type;
fl->fl_pid = 0;
break;
static int
nlmclnt_lock(struct nlm_rqst *req, struct file_lock *fl)
{
+ struct rpc_cred *cred = nfs_file_cred(fl->fl_file);
struct nlm_host *host = req->a_host;
struct nlm_res *resp = &req->a_res;
struct nlm_wait *block = NULL;
unsigned char fl_flags = fl->fl_flags;
+ unsigned char fl_type;
int status = -ENOLCK;
if (nsm_monitor(host) < 0) {
}
fl->fl_flags |= FL_ACCESS;
status = do_vfs_lock(fl);
+ fl->fl_flags = fl_flags;
if (status < 0)
goto out;
block = nlmclnt_prepare_block(host, fl);
again:
+ /*
+ * Initialise resp->status to a valid non-zero value,
+ * since 0 == nlm_lck_granted
+ */
+ resp->status = nlm_lck_blocked;
for(;;) {
/* Reboot protection */
fl->fl_u.nfs_fl.state = host->h_state;
- status = nlmclnt_call(req, NLMPROC_LOCK);
+ status = nlmclnt_call(cred, req, NLMPROC_LOCK);
if (status < 0)
- goto out_unblock;
- if (!req->a_args.block)
break;
/* Did a reclaimer thread notify us of a server reboot? */
if (resp->status == nlm_lck_denied_grace_period)
break;
/* Wait on an NLM blocking lock */
status = nlmclnt_block(block, req, NLMCLNT_POLL_TIMEOUT);
- /* if we were interrupted. Send a CANCEL request to the server
- * and exit
- */
if (status < 0)
- goto out_unblock;
+ break;
if (resp->status != nlm_lck_blocked)
break;
}
+ /* if we were interrupted while blocking, then cancel the lock request
+ * and exit
+ */
+ if (resp->status == nlm_lck_blocked) {
+ if (!req->a_args.block)
+ goto out_unlock;
+ if (nlmclnt_cancel(host, req->a_args.block, fl) == 0)
+ goto out_unblock;
+ }
+
if (resp->status == nlm_granted) {
down_read(&host->h_rwsem);
/* Check whether or not the server has rebooted */
goto again;
}
/* Ensure the resulting lock will get added to granted list */
- fl->fl_flags = fl_flags | FL_SLEEP;
+ fl->fl_flags |= FL_SLEEP;
if (do_vfs_lock(fl) < 0)
- printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
+ printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
up_read(&host->h_rwsem);
+ fl->fl_flags = fl_flags;
+ status = 0;
}
+ if (status < 0)
+ goto out_unlock;
status = nlm_stat_to_errno(resp->status);
out_unblock:
nlmclnt_finish_block(block);
- /* Cancel the blocked request if it is still pending */
- if (resp->status == nlm_lck_blocked)
- nlmclnt_cancel(host, req->a_args.block, fl);
out:
nlm_release_call(req);
+ return status;
+out_unlock:
+ /* Fatal error: ensure that we remove the lock altogether */
+ dprintk("lockd: lock attempt ended in fatal error.\n"
+ " Attempting to unlock.\n");
+ nlmclnt_finish_block(block);
+ fl_type = fl->fl_type;
+ fl->fl_type = F_UNLCK;
+ down_read(&host->h_rwsem);
+ do_vfs_lock(fl);
+ up_read(&host->h_rwsem);
+ fl->fl_type = fl_type;
fl->fl_flags = fl_flags;
+ nlmclnt_async_call(cred, req, NLMPROC_UNLOCK, &nlmclnt_unlock_ops);
return status;
}
nlmclnt_setlockargs(req, fl);
req->a_args.reclaim = 1;
- if ((status = nlmclnt_call(req, NLMPROC_LOCK)) >= 0
- && req->a_res.status == nlm_granted)
+ status = nlmclnt_call(nfs_file_cred(fl->fl_file), req, NLMPROC_LOCK);
+ if (status >= 0 && req->a_res.status == nlm_granted)
return 0;
printk(KERN_WARNING "lockd: failed to reclaim lock for pid %d "
{
struct nlm_host *host = req->a_host;
struct nlm_res *resp = &req->a_res;
- int status = 0;
+ int status;
+ unsigned char fl_flags = fl->fl_flags;
/*
* Note: the server is supposed to either grant us the unlock
*/
fl->fl_flags |= FL_EXISTS;
down_read(&host->h_rwsem);
- if (do_vfs_lock(fl) == -ENOENT) {
- up_read(&host->h_rwsem);
+ status = do_vfs_lock(fl);
+ up_read(&host->h_rwsem);
+ fl->fl_flags = fl_flags;
+ if (status == -ENOENT) {
+ status = 0;
goto out;
}
- up_read(&host->h_rwsem);
-
- if (req->a_flags & RPC_TASK_ASYNC)
- return nlm_async_call(req, NLMPROC_UNLOCK, &nlmclnt_unlock_ops);
- status = nlmclnt_call(req, NLMPROC_UNLOCK);
+ atomic_inc(&req->a_count);
+ status = nlmclnt_async_call(nfs_file_cred(fl->fl_file), req,
+ NLMPROC_UNLOCK, &nlmclnt_unlock_ops);
if (status < 0)
goto out;
static int nlmclnt_cancel(struct nlm_host *host, int block, struct file_lock *fl)
{
struct nlm_rqst *req;
- unsigned long flags;
- sigset_t oldset;
- int status;
+ int status;
- /* Block all signals while setting up call */
- spin_lock_irqsave(¤t->sighand->siglock, flags);
- oldset = current->blocked;
- sigfillset(¤t->blocked);
- recalc_sigpending();
- spin_unlock_irqrestore(¤t->sighand->siglock, flags);
+ dprintk("lockd: blocking lock attempt was interrupted by a signal.\n"
+ " Attempting to cancel lock.\n");
req = nlm_alloc_call(nlm_get_host(host));
if (!req)
nlmclnt_setlockargs(req, fl);
req->a_args.block = block;
- status = nlm_async_call(req, NLMPROC_CANCEL, &nlmclnt_cancel_ops);
-
- spin_lock_irqsave(¤t->sighand->siglock, flags);
- current->blocked = oldset;
- recalc_sigpending();
- spin_unlock_irqrestore(¤t->sighand->siglock, flags);
-
+ atomic_inc(&req->a_count);
+ status = nlmclnt_async_call(nfs_file_cred(fl->fl_file), req,
+ NLMPROC_CANCEL, &nlmclnt_cancel_ops);
+ if (status == 0 && req->a_res.status == nlm_lck_denied)
+ status = -ENOLCK;
+ nlm_release_call(req);
return status;
}
git.openpandora.org / pandora-kernel.git / blobdiff