summaryrefslogtreecommitdiffstats
path: root/fs/lockd/clntproc.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/lockd/clntproc.c')
-rw-r--r--fs/lockd/clntproc.c317
1 files changed, 119 insertions, 198 deletions
diff --git a/fs/lockd/clntproc.c b/fs/lockd/clntproc.c
index 970b6a6aa33..f96e38155b5 100644
--- a/fs/lockd/clntproc.c
+++ b/fs/lockd/clntproc.c
@@ -132,59 +132,18 @@ static void nlmclnt_setlockargs(struct nlm_rqst *req, struct file_lock *fl)
memcpy(&lock->fh, NFS_FH(fl->fl_file->f_dentry->d_inode), sizeof(struct nfs_fh));
lock->caller = system_utsname.nodename;
lock->oh.data = req->a_owner;
- lock->oh.len = sprintf(req->a_owner, "%d@%s",
- current->pid, system_utsname.nodename);
- locks_copy_lock(&lock->fl, fl);
+ lock->oh.len = snprintf(req->a_owner, sizeof(req->a_owner), "%u@%s",
+ (unsigned int)fl->fl_u.nfs_fl.owner->pid,
+ system_utsname.nodename);
+ lock->svid = fl->fl_u.nfs_fl.owner->pid;
+ lock->fl.fl_start = fl->fl_start;
+ lock->fl.fl_end = fl->fl_end;
+ lock->fl.fl_type = fl->fl_type;
}
static void nlmclnt_release_lockargs(struct nlm_rqst *req)
{
- struct file_lock *fl = &req->a_args.lock.fl;
-
- if (fl->fl_ops && fl->fl_ops->fl_release_private)
- fl->fl_ops->fl_release_private(fl);
-}
-
-/*
- * Initialize arguments for GRANTED call. The nlm_rqst structure
- * has been cleared already.
- */
-int
-nlmclnt_setgrantargs(struct nlm_rqst *call, struct nlm_lock *lock)
-{
- locks_copy_lock(&call->a_args.lock.fl, &lock->fl);
- memcpy(&call->a_args.lock.fh, &lock->fh, sizeof(call->a_args.lock.fh));
- call->a_args.lock.caller = system_utsname.nodename;
- call->a_args.lock.oh.len = lock->oh.len;
-
- /* set default data area */
- call->a_args.lock.oh.data = call->a_owner;
-
- if (lock->oh.len > NLMCLNT_OHSIZE) {
- void *data = kmalloc(lock->oh.len, GFP_KERNEL);
- if (!data) {
- nlmclnt_freegrantargs(call);
- return 0;
- }
- call->a_args.lock.oh.data = (u8 *) data;
- }
-
- memcpy(call->a_args.lock.oh.data, lock->oh.data, lock->oh.len);
- return 1;
-}
-
-void
-nlmclnt_freegrantargs(struct nlm_rqst *call)
-{
- struct file_lock *fl = &call->a_args.lock.fl;
- /*
- * Check whether we allocated memory for the owner.
- */
- if (call->a_args.lock.oh.data != (u8 *) call->a_owner) {
- kfree(call->a_args.lock.oh.data);
- }
- if (fl->fl_ops && fl->fl_ops->fl_release_private)
- fl->fl_ops->fl_release_private(fl);
+ BUG_ON(req->a_args.lock.fl.fl_ops != NULL);
}
/*
@@ -193,9 +152,8 @@ nlmclnt_freegrantargs(struct nlm_rqst *call)
int
nlmclnt_proc(struct inode *inode, int cmd, struct file_lock *fl)
{
- struct nfs_server *nfssrv = NFS_SERVER(inode);
struct nlm_host *host;
- struct nlm_rqst reqst, *call = &reqst;
+ struct nlm_rqst *call;
sigset_t oldset;
unsigned long flags;
int status, proto, vers;
@@ -209,23 +167,17 @@ nlmclnt_proc(struct inode *inode, int cmd, struct file_lock *fl)
/* Retrieve transport protocol from NFS client */
proto = NFS_CLIENT(inode)->cl_xprt->prot;
- if (!(host = nlmclnt_lookup_host(NFS_ADDR(inode), proto, vers)))
+ host = nlmclnt_lookup_host(NFS_ADDR(inode), proto, vers);
+ if (host == NULL)
return -ENOLCK;
- /* Create RPC client handle if not there, and copy soft
- * and intr flags from NFS client. */
- if (host->h_rpcclnt == NULL) {
- struct rpc_clnt *clnt;
+ call = nlm_alloc_call(host);
+ if (call == NULL)
+ return -ENOMEM;
- /* Bind an rpc client to this host handle (does not
- * perform a portmapper lookup) */
- if (!(clnt = nlm_bind_host(host))) {
- status = -ENOLCK;
- goto done;
- }
- clnt->cl_softrtry = nfssrv->client->cl_softrtry;
- clnt->cl_intr = nfssrv->client->cl_intr;
- }
+ nlmclnt_locks_init_private(fl, host);
+ /* Set up the argument struct */
+ nlmclnt_setlockargs(call, fl);
/* Keep the old signal mask */
spin_lock_irqsave(&current->sighand->siglock, flags);
@@ -238,26 +190,10 @@ nlmclnt_proc(struct inode *inode, int cmd, struct file_lock *fl)
&& (current->flags & PF_EXITING)) {
sigfillset(&current->blocked); /* Mask all signals */
recalc_sigpending();
- spin_unlock_irqrestore(&current->sighand->siglock, flags);
- call = nlmclnt_alloc_call();
- if (!call) {
- status = -ENOMEM;
- goto out_restore;
- }
call->a_flags = RPC_TASK_ASYNC;
- } else {
- spin_unlock_irqrestore(&current->sighand->siglock, flags);
- memset(call, 0, sizeof(*call));
- locks_init_lock(&call->a_args.lock.fl);
- locks_init_lock(&call->a_res.lock.fl);
}
- call->a_host = host;
-
- nlmclnt_locks_init_private(fl, host);
-
- /* Set up the argument struct */
- nlmclnt_setlockargs(call, fl);
+ spin_unlock_irqrestore(&current->sighand->siglock, flags);
if (IS_SETLK(cmd) || IS_SETLKW(cmd)) {
if (fl->fl_type != F_UNLCK) {
@@ -270,41 +206,58 @@ nlmclnt_proc(struct inode *inode, int cmd, struct file_lock *fl)
else
status = -EINVAL;
- out_restore:
+ fl->fl_ops->fl_release_private(fl);
+ fl->fl_ops = NULL;
+
spin_lock_irqsave(&current->sighand->siglock, flags);
current->blocked = oldset;
recalc_sigpending();
spin_unlock_irqrestore(&current->sighand->siglock, flags);
-done:
dprintk("lockd: clnt proc returns %d\n", status);
- nlm_release_host(host);
return status;
}
EXPORT_SYMBOL(nlmclnt_proc);
/*
* Allocate an NLM RPC call struct
+ *
+ * Note: the caller must hold a reference to host. In case of failure,
+ * this reference will be released.
*/
-struct nlm_rqst *
-nlmclnt_alloc_call(void)
+struct nlm_rqst *nlm_alloc_call(struct nlm_host *host)
{
struct nlm_rqst *call;
- while (!signalled()) {
- call = (struct nlm_rqst *) kmalloc(sizeof(struct nlm_rqst), GFP_KERNEL);
- if (call) {
- memset(call, 0, sizeof(*call));
+ for(;;) {
+ call = kzalloc(sizeof(*call), GFP_KERNEL);
+ if (call != NULL) {
locks_init_lock(&call->a_args.lock.fl);
locks_init_lock(&call->a_res.lock.fl);
+ call->a_host = host;
return call;
}
- printk("nlmclnt_alloc_call: failed, waiting for memory\n");
+ if (signalled())
+ break;
+ printk("nlm_alloc_call: failed, waiting for memory\n");
schedule_timeout_interruptible(5*HZ);
}
+ nlm_release_host(host);
return NULL;
}
+void nlm_release_call(struct nlm_rqst *call)
+{
+ nlm_release_host(call->a_host);
+ nlmclnt_release_lockargs(call);
+ kfree(call);
+}
+
+static void nlmclnt_rpc_release(void *data)
+{
+ return nlm_release_call(data);
+}
+
static int nlm_wait_on_grace(wait_queue_head_t *queue)
{
DEFINE_WAIT(wait);
@@ -401,57 +354,45 @@ in_grace_period:
/*
* Generic NLM call, async version.
*/
-int nlmsvc_async_call(struct nlm_rqst *req, u32 proc, const struct rpc_call_ops *tk_ops)
+static int __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_message msg = {
- .rpc_argp = &req->a_args,
- .rpc_resp = &req->a_res,
- };
- int status;
+ int status = -ENOLCK;
dprintk("lockd: call procedure %d on %s (async)\n",
(int)proc, host->h_name);
/* If we have no RPC client yet, create one. */
- if ((clnt = nlm_bind_host(host)) == NULL)
- return -ENOLCK;
- msg.rpc_proc = &clnt->cl_procinfo[proc];
+ clnt = nlm_bind_host(host);
+ if (clnt == NULL)
+ goto out_err;
+ msg->rpc_proc = &clnt->cl_procinfo[proc];
/* bootstrap and kick off the async RPC call */
- status = rpc_call_async(clnt, &msg, RPC_TASK_ASYNC, tk_ops, req);
-
+ status = rpc_call_async(clnt, msg, RPC_TASK_ASYNC, tk_ops, req);
+ if (status == 0)
+ return 0;
+out_err:
+ nlm_release_call(req);
return status;
}
-static int nlmclnt_async_call(struct nlm_rqst *req, u32 proc, const struct rpc_call_ops *tk_ops)
+int nlm_async_call(struct nlm_rqst *req, u32 proc, const struct rpc_call_ops *tk_ops)
{
- struct nlm_host *host = req->a_host;
- struct rpc_clnt *clnt;
- struct nlm_args *argp = &req->a_args;
- struct nlm_res *resp = &req->a_res;
struct rpc_message msg = {
- .rpc_argp = argp,
- .rpc_resp = resp,
+ .rpc_argp = &req->a_args,
+ .rpc_resp = &req->a_res,
};
- int status;
-
- dprintk("lockd: call procedure %d on %s (async)\n",
- (int)proc, host->h_name);
-
- /* If we have no RPC client yet, create one. */
- if ((clnt = nlm_bind_host(host)) == NULL)
- return -ENOLCK;
- msg.rpc_proc = &clnt->cl_procinfo[proc];
+ return __nlm_async_call(req, proc, &msg, tk_ops);
+}
- /* Increment host refcount */
- nlm_get_host(host);
- /* bootstrap and kick off the async RPC call */
- status = rpc_call_async(clnt, &msg, RPC_TASK_ASYNC, tk_ops, req);
- if (status < 0)
- nlm_release_host(host);
- return status;
+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);
}
/*
@@ -463,36 +404,41 @@ nlmclnt_test(struct nlm_rqst *req, struct file_lock *fl)
int status;
status = nlmclnt_call(req, NLMPROC_TEST);
- nlmclnt_release_lockargs(req);
if (status < 0)
- return status;
+ goto out;
- status = req->a_res.status;
- if (status == NLM_LCK_GRANTED) {
- fl->fl_type = F_UNLCK;
- } if (status == NLM_LCK_DENIED) {
- /*
- * Report the conflicting lock back to the application.
- */
- locks_copy_lock(fl, &req->a_res.lock.fl);
- fl->fl_pid = 0;
- } else {
- return nlm_stat_to_errno(req->a_res.status);
+ switch (req->a_res.status) {
+ case NLM_LCK_GRANTED:
+ fl->fl_type = F_UNLCK;
+ break;
+ case NLM_LCK_DENIED:
+ /*
+ * 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_type = req->a_res.lock.fl.fl_type;
+ fl->fl_pid = 0;
+ break;
+ default:
+ status = nlm_stat_to_errno(req->a_res.status);
}
-
- return 0;
+out:
+ nlm_release_call(req);
+ return status;
}
static void nlmclnt_locks_copy_lock(struct file_lock *new, struct file_lock *fl)
{
- memcpy(&new->fl_u.nfs_fl, &fl->fl_u.nfs_fl, sizeof(new->fl_u.nfs_fl));
- nlm_get_lockowner(new->fl_u.nfs_fl.owner);
+ new->fl_u.nfs_fl.state = fl->fl_u.nfs_fl.state;
+ new->fl_u.nfs_fl.owner = nlm_get_lockowner(fl->fl_u.nfs_fl.owner);
+ list_add_tail(&new->fl_u.nfs_fl.list, &fl->fl_u.nfs_fl.owner->host->h_granted);
}
static void nlmclnt_locks_release_private(struct file_lock *fl)
{
+ list_del(&fl->fl_u.nfs_fl.list);
nlm_put_lockowner(fl->fl_u.nfs_fl.owner);
- fl->fl_ops = NULL;
}
static struct file_lock_operations nlmclnt_lock_ops = {
@@ -504,8 +450,8 @@ static void nlmclnt_locks_init_private(struct file_lock *fl, struct nlm_host *ho
{
BUG_ON(fl->fl_ops != NULL);
fl->fl_u.nfs_fl.state = 0;
- fl->fl_u.nfs_fl.flags = 0;
fl->fl_u.nfs_fl.owner = nlm_find_lockowner(host, fl->fl_owner);
+ INIT_LIST_HEAD(&fl->fl_u.nfs_fl.list);
fl->fl_ops = &nlmclnt_lock_ops;
}
@@ -552,57 +498,52 @@ nlmclnt_lock(struct nlm_rqst *req, struct file_lock *fl)
{
struct nlm_host *host = req->a_host;
struct nlm_res *resp = &req->a_res;
- long timeout;
- int status;
+ struct nlm_wait *block = NULL;
+ int status = -ENOLCK;
if (!host->h_monitored && nsm_monitor(host) < 0) {
printk(KERN_NOTICE "lockd: failed to monitor %s\n",
host->h_name);
- status = -ENOLCK;
goto out;
}
- if (req->a_args.block) {
- status = nlmclnt_prepare_block(req, host, fl);
- if (status < 0)
- goto out;
- }
+ block = nlmclnt_prepare_block(host, fl);
for(;;) {
status = nlmclnt_call(req, NLMPROC_LOCK);
if (status < 0)
goto out_unblock;
- if (resp->status != NLM_LCK_BLOCKED)
+ if (!req->a_args.block)
break;
- /* Wait on an NLM blocking lock */
- timeout = nlmclnt_block(req, NLMCLNT_POLL_TIMEOUT);
/* Did a reclaimer thread notify us of a server reboot? */
if (resp->status == NLM_LCK_DENIED_GRACE_PERIOD)
continue;
if (resp->status != NLM_LCK_BLOCKED)
break;
- if (timeout >= 0)
- continue;
- /* We were interrupted. Send a CANCEL request to the server
+ /* 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
*/
- status = (int)timeout;
- goto out_unblock;
+ if (status < 0)
+ goto out_unblock;
+ if (resp->status != NLM_LCK_BLOCKED)
+ break;
}
if (resp->status == NLM_LCK_GRANTED) {
fl->fl_u.nfs_fl.state = host->h_state;
- fl->fl_u.nfs_fl.flags |= NFS_LCK_GRANTED;
fl->fl_flags |= FL_SLEEP;
+ /* Ensure the resulting lock will get added to granted list */
do_vfs_lock(fl);
}
status = nlm_stat_to_errno(resp->status);
out_unblock:
- nlmclnt_finish_block(req);
+ 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:
- nlmclnt_release_lockargs(req);
+ nlm_release_call(req);
return status;
}
@@ -658,10 +599,6 @@ nlmclnt_unlock(struct nlm_rqst *req, struct file_lock *fl)
struct nlm_res *resp = &req->a_res;
int status;
- /* Clean the GRANTED flag now so the lock doesn't get
- * reclaimed while we're stuck in the unlock call. */
- fl->fl_u.nfs_fl.flags &= ~NFS_LCK_GRANTED;
-
/*
* Note: the server is supposed to either grant us the unlock
* request, or to deny it with NLM_LCK_DENIED_GRACE_PERIOD. In either
@@ -669,32 +606,24 @@ nlmclnt_unlock(struct nlm_rqst *req, struct file_lock *fl)
*/
do_vfs_lock(fl);
- if (req->a_flags & RPC_TASK_ASYNC) {
- status = nlmclnt_async_call(req, NLMPROC_UNLOCK,
- &nlmclnt_unlock_ops);
- /* Hrmf... Do the unlock early since locks_remove_posix()
- * really expects us to free the lock synchronously */
- if (status < 0) {
- nlmclnt_release_lockargs(req);
- kfree(req);
- }
- return status;
- }
+ if (req->a_flags & RPC_TASK_ASYNC)
+ return nlm_async_call(req, NLMPROC_UNLOCK, &nlmclnt_unlock_ops);
status = nlmclnt_call(req, NLMPROC_UNLOCK);
- nlmclnt_release_lockargs(req);
if (status < 0)
- return status;
+ goto out;
+ status = 0;
if (resp->status == NLM_LCK_GRANTED)
- return 0;
+ goto out;
if (resp->status != NLM_LCK_DENIED_NOLOCKS)
printk("lockd: unexpected unlock status: %d\n", resp->status);
-
/* What to do now? I'm out of my depth... */
-
- return -ENOLCK;
+ status = -ENOLCK;
+out:
+ nlm_release_call(req);
+ return status;
}
static void nlmclnt_unlock_callback(struct rpc_task *task, void *data)
@@ -716,9 +645,6 @@ static void nlmclnt_unlock_callback(struct rpc_task *task, void *data)
if (status != NLM_LCK_GRANTED)
printk(KERN_WARNING "lockd: unexpected unlock status: %d\n", status);
die:
- nlm_release_host(req->a_host);
- nlmclnt_release_lockargs(req);
- kfree(req);
return;
retry_rebind:
nlm_rebind_host(req->a_host);
@@ -728,6 +654,7 @@ die:
static const struct rpc_call_ops nlmclnt_unlock_ops = {
.rpc_call_done = nlmclnt_unlock_callback,
+ .rpc_release = nlmclnt_rpc_release,
};
/*
@@ -749,20 +676,15 @@ static int nlmclnt_cancel(struct nlm_host *host, int block, struct file_lock *fl
recalc_sigpending();
spin_unlock_irqrestore(&current->sighand->siglock, flags);
- req = nlmclnt_alloc_call();
+ req = nlm_alloc_call(nlm_get_host(host));
if (!req)
return -ENOMEM;
- req->a_host = host;
req->a_flags = RPC_TASK_ASYNC;
nlmclnt_setlockargs(req, fl);
req->a_args.block = block;
- status = nlmclnt_async_call(req, NLMPROC_CANCEL, &nlmclnt_cancel_ops);
- if (status < 0) {
- nlmclnt_release_lockargs(req);
- kfree(req);
- }
+ status = nlm_async_call(req, NLMPROC_CANCEL, &nlmclnt_cancel_ops);
spin_lock_irqsave(&current->sighand->siglock, flags);
current->blocked = oldset;
@@ -791,6 +713,7 @@ static void nlmclnt_cancel_callback(struct rpc_task *task, void *data)
switch (req->a_res.status) {
case NLM_LCK_GRANTED:
case NLM_LCK_DENIED_GRACE_PERIOD:
+ case NLM_LCK_DENIED:
/* Everything's good */
break;
case NLM_LCK_DENIED_NOLOCKS:
@@ -802,9 +725,6 @@ static void nlmclnt_cancel_callback(struct rpc_task *task, void *data)
}
die:
- nlm_release_host(req->a_host);
- nlmclnt_release_lockargs(req);
- kfree(req);
return;
retry_cancel:
@@ -818,6 +738,7 @@ retry_cancel:
static const struct rpc_call_ops nlmclnt_cancel_ops = {
.rpc_call_done = nlmclnt_cancel_callback,
+ .rpc_release = nlmclnt_rpc_release,
};
/*