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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [fs/] [lockd/] [clntproc.c] - Blame information for rev 1765

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/*
 * linux/fs/lockd/clntproc.c
 *
 * RPC procedures for the client side NLM implementation
 *
 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
 */
 
#include <linux/config.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/nfs_fs.h>
#include <linux/utsname.h>
#include <linux/smp_lock.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/svc.h>
#include <linux/lockd/lockd.h>
#include <linux/lockd/sm_inter.h>
 
#define NLMDBG_FACILITY         NLMDBG_CLIENT
#define NLMCLNT_GRACE_WAIT      (5*HZ)
 
static int      nlmclnt_test(struct nlm_rqst *, struct file_lock *);
static int      nlmclnt_lock(struct nlm_rqst *, struct file_lock *);
static int      nlmclnt_unlock(struct nlm_rqst *, struct file_lock *);
static void     nlmclnt_unlock_callback(struct rpc_task *);
static void     nlmclnt_cancel_callback(struct rpc_task *);
static int      nlm_stat_to_errno(u32 stat);
 
/*
 * Cookie counter for NLM requests
 */
static u32      nlm_cookie = 0x1234;
 
static inline void nlmclnt_next_cookie(struct nlm_cookie *c)
{
        memcpy(c->data, &nlm_cookie, 4);
        memset(c->data+4, 0, 4);
        c->len=4;
        nlm_cookie++;
}
 
/*
 * Initialize arguments for TEST/LOCK/UNLOCK/CANCEL calls
 */
static inline void
nlmclnt_setlockargs(struct nlm_rqst *req, struct file_lock *fl)
{
        struct nlm_args *argp = &req->a_args;
        struct nlm_lock *lock = &argp->lock;
 
        nlmclnt_next_cookie(&argp->cookie);
        argp->state   = nsm_local_state;
        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);
}
 
/*
 * 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)
                        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)
{
        /*
         * 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);
        }
}
 
/*
 * This is the main entry point for the NLM client.
 */
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;
        sigset_t                oldset;
        unsigned long           flags;
        int                     status, proto, vers;
 
        vers = (NFS_PROTO(inode)->version == 3) ? 4 : 1;
        if (NFS_PROTO(inode)->version > 3) {
                printk(KERN_NOTICE "NFSv4 file locking not implemented!\n");
                return -ENOLCK;
        }
 
        /* Retrieve transport protocol from NFS client */
        proto = NFS_CLIENT(inode)->cl_xprt->prot;
 
        if (!(host = nlmclnt_lookup_host(NFS_ADDR(inode), proto, vers)))
                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;
 
                /* 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;
                clnt->cl_chatty   = nfssrv->client->cl_chatty;
        }
 
        /* Keep the old signal mask */
        spin_lock_irqsave(&current->sigmask_lock, 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(&current->blocked);  /* Mask all signals */
                recalc_sigpending(current);
                spin_unlock_irqrestore(&current->sigmask_lock, flags);
 
                call = nlmclnt_alloc_call();
                if (!call) {
                        status = -ENOMEM;
                        goto out_restore;
                }
                call->a_flags = RPC_TASK_ASYNC;
        } else {
                spin_unlock_irqrestore(&current->sigmask_lock, 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;
 
        /* Set up the argument struct */
        nlmclnt_setlockargs(call, fl);
 
        if (IS_SETLK(cmd) || IS_SETLKW(cmd)) {
                if (fl->fl_type != F_UNLCK) {
                        call->a_args.block = IS_SETLKW(cmd) ? 1 : 0;
                        status = nlmclnt_lock(call, fl);
                } else
                        status = nlmclnt_unlock(call, fl);
        } else if (IS_GETLK(cmd))
                status = nlmclnt_test(call, fl);
        else
                status = -EINVAL;
 
        if (status < 0 && (call->a_flags & RPC_TASK_ASYNC))
                kfree(call);
 
 out_restore:
        spin_lock_irqsave(&current->sigmask_lock, flags);
        current->blocked = oldset;
        recalc_sigpending(current);
        spin_unlock_irqrestore(&current->sigmask_lock, flags);
 
done:
        dprintk("lockd: clnt proc returns %d\n", status);
        nlm_release_host(host);
        return status;
}
 
/*
 * Wait while server is in grace period
 */
static inline int
nlmclnt_grace_wait(struct nlm_host *host)
{
        if (!host->h_reclaiming)
                interruptible_sleep_on_timeout(&host->h_gracewait, 10*HZ);
        else
                interruptible_sleep_on(&host->h_gracewait);
        return signalled()? -ERESTARTSYS : 0;
}
 
/*
 * Allocate an NLM RPC call struct
 */
struct nlm_rqst *
nlmclnt_alloc_call(void)
{
        struct nlm_rqst *call;
 
        while (!signalled()) {
                call = (struct nlm_rqst *) kmalloc(sizeof(struct nlm_rqst), GFP_KERNEL);
                if (call) {
                        memset(call, 0, sizeof(*call));
                        locks_init_lock(&call->a_args.lock.fl);
                        locks_init_lock(&call->a_res.lock.fl);
                        return call;
                }
                printk("nlmclnt_alloc_call: failed, waiting for memory\n");
                current->state = TASK_INTERRUPTIBLE;
                schedule_timeout(5*HZ);
        }
        return NULL;
}
 
/*
 * Generic NLM call
 */
int
nlmclnt_call(struct nlm_rqst *req, u32 proc)
{
        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 file     *filp = argp->lock.fl.fl_file;
        struct rpc_message msg;
        int             status;
 
        dprintk("lockd: call procedure %s on %s\n",
                        nlm_procname(proc), host->h_name);
 
        msg.rpc_proc = proc;
        msg.rpc_argp = argp;
        msg.rpc_resp = resp;
        if (filp)
                msg.rpc_cred = nfs_file_cred(filp);
        else
                msg.rpc_cred = NULL;
 
        do {
                if (host->h_reclaiming && !argp->reclaim) {
                        interruptible_sleep_on(&host->h_gracewait);
                        continue;
                }
 
                /* If we have no RPC client yet, create one. */
                if ((clnt = nlm_bind_host(host)) == NULL)
                        return -ENOLCK;
 
                /* Perform the RPC call. If an error occurs, try again */
                if ((status = rpc_call_sync(clnt, &msg, 0)) < 0) {
                        dprintk("lockd: rpc_call returned error %d\n", -status);
                        switch (status) {
                        case -EPROTONOSUPPORT:
                                status = -EINVAL;
                                break;
                        case -ECONNREFUSED:
                        case -ETIMEDOUT:
                        case -ENOTCONN:
                                nlm_rebind_host(host);
                                status = -EAGAIN;
                                break;
                        case -ERESTARTSYS:
                                return signalled () ? -EINTR : status;
                        default:
                                break;
                        }
                        break;
                } else
                if (resp->status == NLM_LCK_DENIED_GRACE_PERIOD) {
                        dprintk("lockd: server in grace period\n");
                        if (argp->reclaim) {
                                printk(KERN_WARNING
                                     "lockd: spurious grace period reject?!\n");
                                return -ENOLCK;
                        }
                } else {
                        dprintk("lockd: server returns status %d\n", resp->status);
                        return 0;        /* Okay, call complete */
                }
 
                /* Back off a little and try again */
                interruptible_sleep_on_timeout(&host->h_gracewait, 15*HZ);
 
                /* When the lock requested by F_SETLKW isn't available,
                   we will wait until the request can be satisfied. If
                   a signal is received during wait, we should return
                   -EINTR. */
                if (signalled ()) {
                        status = -EINTR;
                        break;
                }
        } while (1);
 
        return status;
}
 
/*
 * Generic NLM call, async version.
 */
int
nlmsvc_async_call(struct nlm_rqst *req, u32 proc, rpc_action callback)
{
        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;
        int             status;
 
        dprintk("lockd: call procedure %s on %s (async)\n",
                        nlm_procname(proc), host->h_name);
 
        /* If we have no RPC client yet, create one. */
        if ((clnt = nlm_bind_host(host)) == NULL)
                return -ENOLCK;
 
        /* bootstrap and kick off the async RPC call */
        msg.rpc_proc = proc;
        msg.rpc_argp = argp;
        msg.rpc_resp =resp;
        msg.rpc_cred = NULL;
        status = rpc_call_async(clnt, &msg, RPC_TASK_ASYNC, callback, req);
 
        return status;
}
 
int
nlmclnt_async_call(struct nlm_rqst *req, u32 proc, rpc_action callback)
{
        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 file     *file = argp->lock.fl.fl_file;
        struct rpc_message msg;
        int             status;
 
        dprintk("lockd: call procedure %s on %s (async)\n",
                        nlm_procname(proc), host->h_name);
 
        /* If we have no RPC client yet, create one. */
        if ((clnt = nlm_bind_host(host)) == NULL)
                return -ENOLCK;
 
        /* bootstrap and kick off the async RPC call */
        msg.rpc_proc = proc;
        msg.rpc_argp = argp;
        msg.rpc_resp =resp;
        if (file)
                msg.rpc_cred = nfs_file_cred(file);
        else
                msg.rpc_cred = NULL;
        /* Increment host refcount */
        nlm_get_host(host);
        status = rpc_call_async(clnt, &msg, RPC_TASK_ASYNC, callback, req);
        if (status < 0)
                nlm_release_host(host);
        return status;
}
 
/*
 * TEST for the presence of a conflicting lock
 */
static int
nlmclnt_test(struct nlm_rqst *req, struct file_lock *fl)
{
        int     status;
 
        if ((status = nlmclnt_call(req, NLMPROC_TEST)) < 0)
                return status;
 
        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.
                 * FIXME: Is it OK to report the pid back as well?
                 */
                locks_copy_lock(fl, &req->a_res.lock.fl);
                /* fl->fl_pid = 0; */
        } else {
                return nlm_stat_to_errno(req->a_res.status);
        }
 
        return 0;
}
 
static
void nlmclnt_insert_lock_callback(struct file_lock *fl)
{
        nlm_get_host(fl->fl_u.nfs_fl.host);
}
static
void nlmclnt_remove_lock_callback(struct file_lock *fl)
{
        if (fl->fl_u.nfs_fl.host) {
                nlm_release_host(fl->fl_u.nfs_fl.host);
                fl->fl_u.nfs_fl.host = NULL;
        }
}
 
/*
 * LOCK: Try to create a lock
 *
 *                      Programmer Harassment Alert
 *
 * When given a blocking lock request in a sync RPC call, the HPUX lockd
 * will faithfully return LCK_BLOCKED but never cares to notify us when
 * the lock could be granted. This way, our local process could hang
 * around forever waiting for the callback.
 *
 *  Solution A: Implement busy-waiting
 *  Solution B: Use the async version of the call (NLM_LOCK_{MSG,RES})
 *
 * For now I am implementing solution A, because I hate the idea of
 * re-implementing lockd for a third time in two months. The async
 * calls shouldn't be too hard to do, however.
 *
 * This is one of the lovely things about standards in the NFS area:
 * they're so soft and squishy you can't really blame HP for doing this.
 */
static int
nlmclnt_lock(struct nlm_rqst *req, struct file_lock *fl)
{
        struct nlm_host *host = req->a_host;
        struct nlm_res  *resp = &req->a_res;
        int             status;
 
        if (!host->h_monitored && nsm_monitor(host) < 0) {
                printk(KERN_NOTICE "lockd: failed to monitor %s\n",
                                        host->h_name);
                return -ENOLCK;
        }
 
        do {
                if ((status = nlmclnt_call(req, NLMPROC_LOCK)) >= 0) {
                        if (resp->status != NLM_LCK_BLOCKED)
                                break;
                        status = nlmclnt_block(host, fl, &resp->status);
                }
                if (status < 0)
                        return status;
        } while (resp->status == NLM_LCK_BLOCKED && req->a_args.block);
 
        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_u.nfs_fl.host = host;
                fl->fl_insert = nlmclnt_insert_lock_callback;
                fl->fl_remove = nlmclnt_remove_lock_callback;
        }
 
        return nlm_stat_to_errno(resp->status);
}
 
/*
 * RECLAIM: Try to reclaim a lock
 */
int
nlmclnt_reclaim(struct nlm_host *host, struct file_lock *fl)
{
        struct nlm_rqst reqst, *req;
        int             status;
 
        req = &reqst;
        memset(req, 0, sizeof(*req));
        locks_init_lock(&req->a_args.lock.fl);
        locks_init_lock(&req->a_res.lock.fl);
        req->a_host  = host;
        req->a_flags = 0;
 
        /* Set up the argument struct */
        nlmclnt_setlockargs(req, fl);
        req->a_args.reclaim = 1;
 
        if ((status = nlmclnt_call(req, NLMPROC_LOCK)) >= 0
         && req->a_res.status == NLM_LCK_GRANTED)
                return 0;
 
        printk(KERN_WARNING "lockd: failed to reclaim lock for pid %d "
                                "(errno %d, status %d)\n", fl->fl_pid,
                                status, req->a_res.status);
 
        /*
         * FIXME: This is a serious failure. We can
         *
         *  a.  Ignore the problem
         *  b.  Send the owning process some signal (Linux doesn't have
         *      SIGLOST, though...)
         *  c.  Retry the operation
         *
         * Until someone comes up with a simple implementation
         * for b or c, I'll choose option a.
         */
 
        return -ENOLCK;
}
 
/*
 * UNLOCK: remove an existing lock
 */
static int
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;
 
        if (req->a_flags & RPC_TASK_ASYNC) {
                return nlmclnt_async_call(req, NLMPROC_UNLOCK,
                                        nlmclnt_unlock_callback);
        }
 
        if ((status = nlmclnt_call(req, NLMPROC_UNLOCK)) < 0)
                return status;
 
        if (resp->status == NLM_LCK_GRANTED)
                return 0;
 
        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;
}
 
static void
nlmclnt_unlock_callback(struct rpc_task *task)
{
        struct nlm_rqst *req = (struct nlm_rqst *) task->tk_calldata;
        int             status = req->a_res.status;
 
        if (RPC_ASSASSINATED(task))
                goto die;
 
        if (task->tk_status < 0) {
                dprintk("lockd: unlock failed (err = %d)\n", -task->tk_status);
                goto retry_rebind;
        }
        if (status == NLM_LCK_DENIED_GRACE_PERIOD) {
                rpc_delay(task, NLMCLNT_GRACE_WAIT);
                goto retry_unlock;
        }
        if (status != NLM_LCK_GRANTED)
                printk(KERN_WARNING "lockd: unexpected unlock status: %d\n", status);
 
die:
        nlm_release_host(req->a_host);
        kfree(req);
        return;
 retry_rebind:
        nlm_rebind_host(req->a_host);
 retry_unlock:
        rpc_restart_call(task);
}
 
/*
 * Cancel a blocked lock request.
 * We always use an async RPC call for this in order not to hang a
 * process that has been Ctrl-C'ed.
 */
int
nlmclnt_cancel(struct nlm_host *host, struct file_lock *fl)
{
        struct nlm_rqst *req;
        unsigned long   flags;
        sigset_t        oldset;
        int             status;
 
        /* Block all signals while setting up call */
        spin_lock_irqsave(&current->sigmask_lock, flags);
        oldset = current->blocked;
        sigfillset(&current->blocked);
        recalc_sigpending(current);
        spin_unlock_irqrestore(&current->sigmask_lock, flags);
 
        req = nlmclnt_alloc_call();
        if (!req)
                return -ENOMEM;
        req->a_host  = host;
        req->a_flags = RPC_TASK_ASYNC;
 
        nlmclnt_setlockargs(req, fl);
 
        status = nlmclnt_async_call(req, NLMPROC_CANCEL,
                                        nlmclnt_cancel_callback);
        if (status < 0)
                kfree(req);
 
        spin_lock_irqsave(&current->sigmask_lock, flags);
        current->blocked = oldset;
        recalc_sigpending(current);
        spin_unlock_irqrestore(&current->sigmask_lock, flags);
 
        return status;
}
 
static void
nlmclnt_cancel_callback(struct rpc_task *task)
{
        struct nlm_rqst *req = (struct nlm_rqst *) task->tk_calldata;
 
        if (RPC_ASSASSINATED(task))
                goto die;
 
        if (task->tk_status < 0) {
                dprintk("lockd: CANCEL call error %d, retrying.\n",
                                        task->tk_status);
                goto retry_cancel;
        }
 
        dprintk("lockd: cancel status %d (task %d)\n",
                        req->a_res.status, task->tk_pid);
 
        switch (req->a_res.status) {
        case NLM_LCK_GRANTED:
        case NLM_LCK_DENIED_GRACE_PERIOD:
                /* Everything's good */
                break;
        case NLM_LCK_DENIED_NOLOCKS:
                dprintk("lockd: CANCEL failed (server has no locks)\n");
                goto retry_cancel;
        default:
                printk(KERN_NOTICE "lockd: weird return %d for CANCEL call\n",
                        req->a_res.status);
        }
 
die:
        nlm_release_host(req->a_host);
        kfree(req);
        return;
 
retry_cancel:
        nlm_rebind_host(req->a_host);
        rpc_restart_call(task);
        rpc_delay(task, 30 * HZ);
}
 
/*
 * Convert an NLM status code to a generic kernel errno
 */
static int
nlm_stat_to_errno(u32 status)
{
        switch(status) {
        case NLM_LCK_GRANTED:
                return 0;
        case NLM_LCK_DENIED:
                return -EAGAIN;
        case NLM_LCK_DENIED_NOLOCKS:
        case NLM_LCK_DENIED_GRACE_PERIOD:
                return -ENOLCK;
        case NLM_LCK_BLOCKED:
                printk(KERN_NOTICE "lockd: unexpected status NLM_BLOCKED\n");
                return -ENOLCK;
#ifdef CONFIG_LOCKD_V4
        case NLM_DEADLCK:
                return -EDEADLK;
        case NLM_ROFS:
                return -EROFS;
        case NLM_STALE_FH:
                return -ESTALE;
        case NLM_FBIG:
                return -EOVERFLOW;
        case NLM_FAILED:
                return -ENOLCK;
#endif
        }
        printk(KERN_NOTICE "lockd: unexpected server status %d\n", status);
        return -ENOLCK;
}

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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [fs/] [lockd/] [clntproc.c] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`* linux/fs/lockd/clntproc.c`
3			`*`
4			`* RPC procedures for the client side NLM implementation`
5			`*`
6			`* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>`
7			`*/`
8
9			`#include <linux/config.h>`
10			`#include <linux/types.h>`
11			`#include <linux/errno.h>`
12			`#include <linux/fs.h>`
13			`#include <linux/nfs_fs.h>`
14			`#include <linux/utsname.h>`
15			`#include <linux/smp_lock.h>`
16			`#include <linux/sunrpc/clnt.h>`
17			`#include <linux/sunrpc/svc.h>`
18			`#include <linux/lockd/lockd.h>`
19			`#include <linux/lockd/sm_inter.h>`
20
21			`#define NLMDBG_FACILITY NLMDBG_CLIENT`
22			`#define NLMCLNT_GRACE_WAIT (5*HZ)`
23
24			`static int nlmclnt_test(struct nlm_rqst , struct file_lock );`
25			`static int nlmclnt_lock(struct nlm_rqst , struct file_lock );`
26			`static int nlmclnt_unlock(struct nlm_rqst , struct file_lock );`
27			`static void nlmclnt_unlock_callback(struct rpc_task *);`
28			`static void nlmclnt_cancel_callback(struct rpc_task *);`
29			`static int nlm_stat_to_errno(u32 stat);`
30
31			`/*`
32			`* Cookie counter for NLM requests`
33			`*/`
34			`static u32 nlm_cookie = 0x1234;`
35
36			`static inline void nlmclnt_next_cookie(struct nlm_cookie *c)`
37			`{`
38			`memcpy(c->data, &nlm_cookie, 4);`
39			`memset(c->data+4, 0, 4);`
40			`c->len=4;`
41			`nlm_cookie++;`
42			`}`
43
44			`/*`
45			`* Initialize arguments for TEST/LOCK/UNLOCK/CANCEL calls`
46			`*/`
47			`static inline void`
48			`nlmclnt_setlockargs(struct nlm_rqst req, struct file_lock fl)`
49			`{`
50			`struct nlm_args *argp = &req->a_args;`
51			`struct nlm_lock *lock = &argp->lock;`
52
53			`nlmclnt_next_cookie(&argp->cookie);`
54			`argp->state = nsm_local_state;`
55			`memcpy(&lock->fh, NFS_FH(fl->fl_file->f_dentry->d_inode), sizeof(struct nfs_fh));`
56			`lock->caller = system_utsname.nodename;`
57			`lock->oh.data = req->a_owner;`
58			`lock->oh.len = sprintf(req->a_owner, "%d@%s",`
59			`current->pid, system_utsname.nodename);`
60			`locks_copy_lock(&lock->fl, fl);`
61			`}`
62
63			`/*`
64			`* Initialize arguments for GRANTED call. The nlm_rqst structure`
65			`* has been cleared already.`
66			`*/`
67			`int`
68			`nlmclnt_setgrantargs(struct nlm_rqst call, struct nlm_lock lock)`
69			`{`
70			`locks_copy_lock(&call->a_args.lock.fl, &lock->fl);`
71			`memcpy(&call->a_args.lock.fh, &lock->fh, sizeof(call->a_args.lock.fh));`
72			`call->a_args.lock.caller = system_utsname.nodename;`
73			`call->a_args.lock.oh.len = lock->oh.len;`
74
75			`/* set default data area */`
76			`call->a_args.lock.oh.data = call->a_owner;`
77
78			`if (lock->oh.len > NLMCLNT_OHSIZE) {`
79			`void *data = kmalloc(lock->oh.len, GFP_KERNEL);`
80			`if (!data)`
81			`return 0;`
82			`call->a_args.lock.oh.data = (u8 *) data;`
83			`}`
84
85			`memcpy(call->a_args.lock.oh.data, lock->oh.data, lock->oh.len);`
86			`return 1;`
87			`}`
88
89			`void`
90			`nlmclnt_freegrantargs(struct nlm_rqst *call)`
91			`{`
92			`/*`
93			`* Check whether we allocated memory for the owner.`
94			`*/`
95			`if (call->a_args.lock.oh.data != (u8 *) call->a_owner) {`
96			`kfree(call->a_args.lock.oh.data);`
97			`}`
98			`}`
99
100			`/*`
101			`* This is the main entry point for the NLM client.`
102			`*/`
103			`int`
104			`nlmclnt_proc(struct inode inode, int cmd, struct file_lock fl)`
105			`{`
106			`struct nfs_server *nfssrv = NFS_SERVER(inode);`
107			`struct nlm_host *host;`
108			`struct nlm_rqst reqst, *call = &reqst;`
109			`sigset_t oldset;`
110			`unsigned long flags;`
111			`int status, proto, vers;`
112
113			`vers = (NFS_PROTO(inode)->version == 3) ? 4 : 1;`
114			`if (NFS_PROTO(inode)->version > 3) {`
115			`printk(KERN_NOTICE "NFSv4 file locking not implemented!\n");`
116			`return -ENOLCK;`
117			`}`
118
119			`/* Retrieve transport protocol from NFS client */`
120			`proto = NFS_CLIENT(inode)->cl_xprt->prot;`
121
122			`if (!(host = nlmclnt_lookup_host(NFS_ADDR(inode), proto, vers)))`
123			`return -ENOLCK;`
124
125			`/* Create RPC client handle if not there, and copy soft`
126			`* and intr flags from NFS client. */`
127			`if (host->h_rpcclnt == NULL) {`
128			`struct rpc_clnt *clnt;`
129
130			`/* Bind an rpc client to this host handle (does not`
131			`* perform a portmapper lookup) */`
132			`if (!(clnt = nlm_bind_host(host))) {`
133			`status = -ENOLCK;`
134			`goto done;`
135			`}`
136			`clnt->cl_softrtry = nfssrv->client->cl_softrtry;`
137			`clnt->cl_intr = nfssrv->client->cl_intr;`
138			`clnt->cl_chatty = nfssrv->client->cl_chatty;`
139			`}`
140
141			`/* Keep the old signal mask */`
142			`spin_lock_irqsave(&current->sigmask_lock, flags);`
143			`oldset = current->blocked;`
144
145			`/* If we're cleaning up locks because the process is exiting,`
146			`* perform the RPC call asynchronously. */`
147			`if ((IS_SETLK(cmd) \|\| IS_SETLKW(cmd))`
148			`&& fl->fl_type == F_UNLCK`
149			`&& (current->flags & PF_EXITING)) {`
150			`sigfillset(&current->blocked); /* Mask all signals */`
151			`recalc_sigpending(current);`
152			`spin_unlock_irqrestore(&current->sigmask_lock, flags);`
153
154			`call = nlmclnt_alloc_call();`
155			`if (!call) {`
156			`status = -ENOMEM;`
157			`goto out_restore;`
158			`}`
159			`call->a_flags = RPC_TASK_ASYNC;`
160			`} else {`
161			`spin_unlock_irqrestore(&current->sigmask_lock, flags);`
162			`memset(call, 0, sizeof(*call));`
163			`locks_init_lock(&call->a_args.lock.fl);`
164			`locks_init_lock(&call->a_res.lock.fl);`
165			`}`
166			`call->a_host = host;`
167
168			`/* Set up the argument struct */`
169			`nlmclnt_setlockargs(call, fl);`
170
171			`if (IS_SETLK(cmd) \|\| IS_SETLKW(cmd)) {`
172			`if (fl->fl_type != F_UNLCK) {`
173			`call->a_args.block = IS_SETLKW(cmd) ? 1 : 0;`
174			`status = nlmclnt_lock(call, fl);`
175			`} else`
176			`status = nlmclnt_unlock(call, fl);`
177			`} else if (IS_GETLK(cmd))`
178			`status = nlmclnt_test(call, fl);`
179			`else`
180			`status = -EINVAL;`
181
182			`if (status < 0 && (call->a_flags & RPC_TASK_ASYNC))`
183			`kfree(call);`
184
185			`out_restore:`
186			`spin_lock_irqsave(&current->sigmask_lock, flags);`
187			`current->blocked = oldset;`
188			`recalc_sigpending(current);`
189			`spin_unlock_irqrestore(&current->sigmask_lock, flags);`
190
191			`done:`
192			`dprintk("lockd: clnt proc returns %d\n", status);`
193			`nlm_release_host(host);`
194			`return status;`
195			`}`
196
197			`/*`
198			`* Wait while server is in grace period`
199			`*/`
200			`static inline int`
201			`nlmclnt_grace_wait(struct nlm_host *host)`
202			`{`
203			`if (!host->h_reclaiming)`
204			`interruptible_sleep_on_timeout(&host->h_gracewait, 10*HZ);`
205			`else`
206			`interruptible_sleep_on(&host->h_gracewait);`
207			`return signalled()? -ERESTARTSYS : 0;`
208			`}`
209
210			`/*`
211			`* Allocate an NLM RPC call struct`
212			`*/`
213			`struct nlm_rqst *`
214			`nlmclnt_alloc_call(void)`
215			`{`
216			`struct nlm_rqst *call;`
217
218			`while (!signalled()) {`
219			`call = (struct nlm_rqst *) kmalloc(sizeof(struct nlm_rqst), GFP_KERNEL);`
220			`if (call) {`
221			`memset(call, 0, sizeof(*call));`
222			`locks_init_lock(&call->a_args.lock.fl);`
223			`locks_init_lock(&call->a_res.lock.fl);`
224			`return call;`
225			`}`
226			`printk("nlmclnt_alloc_call: failed, waiting for memory\n");`
227			`current->state = TASK_INTERRUPTIBLE;`
228			`schedule_timeout(5*HZ);`
229			`}`
230			`return NULL;`
231			`}`
232
233			`/*`
234			`* Generic NLM call`
235			`*/`
236			`int`
237			`nlmclnt_call(struct nlm_rqst *req, u32 proc)`
238			`{`
239			`struct nlm_host *host = req->a_host;`
240			`struct rpc_clnt *clnt;`
241			`struct nlm_args *argp = &req->a_args;`
242			`struct nlm_res *resp = &req->a_res;`
243			`struct file *filp = argp->lock.fl.fl_file;`
244			`struct rpc_message msg;`
245			`int status;`
246
247			`dprintk("lockd: call procedure %s on %s\n",`
248			`nlm_procname(proc), host->h_name);`
249
250			`msg.rpc_proc = proc;`
251			`msg.rpc_argp = argp;`
252			`msg.rpc_resp = resp;`
253			`if (filp)`
254			`msg.rpc_cred = nfs_file_cred(filp);`
255			`else`
256			`msg.rpc_cred = NULL;`
257
258			`do {`
259			`if (host->h_reclaiming && !argp->reclaim) {`
260			`interruptible_sleep_on(&host->h_gracewait);`
261			`continue;`
262			`}`
263
264			`/* If we have no RPC client yet, create one. */`
265			`if ((clnt = nlm_bind_host(host)) == NULL)`
266			`return -ENOLCK;`
267
268			`/* Perform the RPC call. If an error occurs, try again */`
269			`if ((status = rpc_call_sync(clnt, &msg, 0)) < 0) {`
270			`dprintk("lockd: rpc_call returned error %d\n", -status);`
271			`switch (status) {`
272			`case -EPROTONOSUPPORT:`
273			`status = -EINVAL;`
274			`break;`
275			`case -ECONNREFUSED:`
276			`case -ETIMEDOUT:`
277			`case -ENOTCONN:`
278			`nlm_rebind_host(host);`
279			`status = -EAGAIN;`
280			`break;`
281			`case -ERESTARTSYS:`
282			`return signalled () ? -EINTR : status;`
283			`default:`
284			`break;`
285			`}`
286			`break;`
287			`} else`
288			`if (resp->status == NLM_LCK_DENIED_GRACE_PERIOD) {`
289			`dprintk("lockd: server in grace period\n");`
290			`if (argp->reclaim) {`
291			`printk(KERN_WARNING`
292			`"lockd: spurious grace period reject?!\n");`
293			`return -ENOLCK;`
294			`}`
295			`} else {`
296			`dprintk("lockd: server returns status %d\n", resp->status);`
297			`return 0; /* Okay, call complete */`
298			`}`
299
300			`/* Back off a little and try again */`
301			`interruptible_sleep_on_timeout(&host->h_gracewait, 15*HZ);`
302
303			`/* When the lock requested by F_SETLKW isn't available,`
304			`we will wait until the request can be satisfied. If`
305			`a signal is received during wait, we should return`
306			`-EINTR. */`
307			`if (signalled ()) {`
308			`status = -EINTR;`
309			`break;`
310			`}`
311			`} while (1);`
312
313			`return status;`
314			`}`
315
316			`/*`
317			`* Generic NLM call, async version.`
318			`*/`
319			`int`
320			`nlmsvc_async_call(struct nlm_rqst *req, u32 proc, rpc_action callback)`
321			`{`
322			`struct nlm_host *host = req->a_host;`
323			`struct rpc_clnt *clnt;`
324			`struct nlm_args *argp = &req->a_args;`
325			`struct nlm_res *resp = &req->a_res;`
326			`struct rpc_message msg;`
327			`int status;`
328
329			`dprintk("lockd: call procedure %s on %s (async)\n",`
330			`nlm_procname(proc), host->h_name);`
331
332			`/* If we have no RPC client yet, create one. */`
333			`if ((clnt = nlm_bind_host(host)) == NULL)`
334			`return -ENOLCK;`
335
336			`/* bootstrap and kick off the async RPC call */`
337			`msg.rpc_proc = proc;`
338			`msg.rpc_argp = argp;`
339			`msg.rpc_resp =resp;`
340			`msg.rpc_cred = NULL;`
341			`status = rpc_call_async(clnt, &msg, RPC_TASK_ASYNC, callback, req);`
342
343			`return status;`
344			`}`
345
346			`int`
347			`nlmclnt_async_call(struct nlm_rqst *req, u32 proc, rpc_action callback)`
348			`{`
349			`struct nlm_host *host = req->a_host;`
350			`struct rpc_clnt *clnt;`
351			`struct nlm_args *argp = &req->a_args;`
352			`struct nlm_res *resp = &req->a_res;`
353			`struct file *file = argp->lock.fl.fl_file;`
354			`struct rpc_message msg;`
355			`int status;`
356
357			`dprintk("lockd: call procedure %s on %s (async)\n",`
358			`nlm_procname(proc), host->h_name);`
359
360			`/* If we have no RPC client yet, create one. */`
361			`if ((clnt = nlm_bind_host(host)) == NULL)`
362			`return -ENOLCK;`
363
364			`/* bootstrap and kick off the async RPC call */`
365			`msg.rpc_proc = proc;`
366			`msg.rpc_argp = argp;`
367			`msg.rpc_resp =resp;`
368			`if (file)`
369			`msg.rpc_cred = nfs_file_cred(file);`
370			`else`
371			`msg.rpc_cred = NULL;`
372			`/* Increment host refcount */`
373			`nlm_get_host(host);`
374			`status = rpc_call_async(clnt, &msg, RPC_TASK_ASYNC, callback, req);`
375			`if (status < 0)`
376			`nlm_release_host(host);`
377			`return status;`
378			`}`
379
380			`/*`
381			`* TEST for the presence of a conflicting lock`
382			`*/`
383			`static int`
384			`nlmclnt_test(struct nlm_rqst req, struct file_lock fl)`
385			`{`
386			`int status;`
387
388			`if ((status = nlmclnt_call(req, NLMPROC_TEST)) < 0)`
389			`return status;`
390
391			`status = req->a_res.status;`
392			`if (status == NLM_LCK_GRANTED) {`
393			`fl->fl_type = F_UNLCK;`
394			`} if (status == NLM_LCK_DENIED) {`
395			`/*`
396			`* Report the conflicting lock back to the application.`
397			`* FIXME: Is it OK to report the pid back as well?`
398			`*/`
399			`locks_copy_lock(fl, &req->a_res.lock.fl);`
400			`/* fl->fl_pid = 0; */`
401			`} else {`
402			`return nlm_stat_to_errno(req->a_res.status);`
403			`}`
404
405			`return 0;`
406			`}`
407
408			`static`
409			`void nlmclnt_insert_lock_callback(struct file_lock *fl)`
410			`{`
411			`nlm_get_host(fl->fl_u.nfs_fl.host);`
412			`}`
413			`static`
414			`void nlmclnt_remove_lock_callback(struct file_lock *fl)`
415			`{`
416			`if (fl->fl_u.nfs_fl.host) {`
417			`nlm_release_host(fl->fl_u.nfs_fl.host);`
418			`fl->fl_u.nfs_fl.host = NULL;`
419			`}`
420			`}`
421
422			`/*`
423			`* LOCK: Try to create a lock`
424			`*`
425			`* Programmer Harassment Alert`
426			`*`
427			`* When given a blocking lock request in a sync RPC call, the HPUX lockd`
428			`* will faithfully return LCK_BLOCKED but never cares to notify us when`
429			`* the lock could be granted. This way, our local process could hang`
430			`* around forever waiting for the callback.`
431			`*`
432			`* Solution A: Implement busy-waiting`
433			`* Solution B: Use the async version of the call (NLM_LOCK_{MSG,RES})`
434			`*`
435			`* For now I am implementing solution A, because I hate the idea of`
436			`* re-implementing lockd for a third time in two months. The async`
437			`* calls shouldn't be too hard to do, however.`
438			`*`
439			`* This is one of the lovely things about standards in the NFS area:`
440			`* they're so soft and squishy you can't really blame HP for doing this.`
441			`*/`
442			`static int`
443			`nlmclnt_lock(struct nlm_rqst req, struct file_lock fl)`
444			`{`
445			`struct nlm_host *host = req->a_host;`
446			`struct nlm_res *resp = &req->a_res;`
447			`int status;`
448
449			`if (!host->h_monitored && nsm_monitor(host) < 0) {`
450			`printk(KERN_NOTICE "lockd: failed to monitor %s\n",`
451			`host->h_name);`
452			`return -ENOLCK;`
453			`}`
454
455			`do {`
456			`if ((status = nlmclnt_call(req, NLMPROC_LOCK)) >= 0) {`
457			`if (resp->status != NLM_LCK_BLOCKED)`
458			`break;`
459			`status = nlmclnt_block(host, fl, &resp->status);`
460			`}`
461			`if (status < 0)`
462			`return status;`
463			`} while (resp->status == NLM_LCK_BLOCKED && req->a_args.block);`
464
465			`if (resp->status == NLM_LCK_GRANTED) {`
466			`fl->fl_u.nfs_fl.state = host->h_state;`
467			`fl->fl_u.nfs_fl.flags \|= NFS_LCK_GRANTED;`
468			`fl->fl_u.nfs_fl.host = host;`
469			`fl->fl_insert = nlmclnt_insert_lock_callback;`
470			`fl->fl_remove = nlmclnt_remove_lock_callback;`
471			`}`
472
473			`return nlm_stat_to_errno(resp->status);`
474			`}`
475
476			`/*`
477			`* RECLAIM: Try to reclaim a lock`
478			`*/`
479			`int`
480			`nlmclnt_reclaim(struct nlm_host host, struct file_lock fl)`
481			`{`
482			`struct nlm_rqst reqst, *req;`
483			`int status;`
484
485			`req = &reqst;`
486			`memset(req, 0, sizeof(*req));`
487			`locks_init_lock(&req->a_args.lock.fl);`
488			`locks_init_lock(&req->a_res.lock.fl);`
489			`req->a_host = host;`
490			`req->a_flags = 0;`
491
492			`/* Set up the argument struct */`
493			`nlmclnt_setlockargs(req, fl);`
494			`req->a_args.reclaim = 1;`
495
496			`if ((status = nlmclnt_call(req, NLMPROC_LOCK)) >= 0`
497			`&& req->a_res.status == NLM_LCK_GRANTED)`
498			`return 0;`
499
500			`printk(KERN_WARNING "lockd: failed to reclaim lock for pid %d "`
501			`"(errno %d, status %d)\n", fl->fl_pid,`
502			`status, req->a_res.status);`
503
504			`/*`
505			`* FIXME: This is a serious failure. We can`
506			`*`
507			`* a. Ignore the problem`
508			`* b. Send the owning process some signal (Linux doesn't have`
509			`* SIGLOST, though...)`
510			`* c. Retry the operation`
511			`*`
512			`* Until someone comes up with a simple implementation`
513			`* for b or c, I'll choose option a.`
514			`*/`
515
516			`return -ENOLCK;`
517			`}`
518
519			`/*`
520			`* UNLOCK: remove an existing lock`
521			`*/`
522			`static int`
523			`nlmclnt_unlock(struct nlm_rqst req, struct file_lock fl)`
524			`{`
525			`struct nlm_res *resp = &req->a_res;`
526			`int status;`
527
528			`/* Clean the GRANTED flag now so the lock doesn't get`
529			`* reclaimed while we're stuck in the unlock call. */`
530			`fl->fl_u.nfs_fl.flags &= ~NFS_LCK_GRANTED;`
531
532			`if (req->a_flags & RPC_TASK_ASYNC) {`
533			`return nlmclnt_async_call(req, NLMPROC_UNLOCK,`
534			`nlmclnt_unlock_callback);`
535			`}`
536
537			`if ((status = nlmclnt_call(req, NLMPROC_UNLOCK)) < 0)`
538			`return status;`
539
540			`if (resp->status == NLM_LCK_GRANTED)`
541			`return 0;`
542
543			`if (resp->status != NLM_LCK_DENIED_NOLOCKS)`
544			`printk("lockd: unexpected unlock status: %d\n", resp->status);`
545
546			`/* What to do now? I'm out of my depth... */`
547
548			`return -ENOLCK;`
549			`}`
550
551			`static void`
552			`nlmclnt_unlock_callback(struct rpc_task *task)`
553			`{`
554			`struct nlm_rqst req = (struct nlm_rqst ) task->tk_calldata;`
555			`int status = req->a_res.status;`
556
557			`if (RPC_ASSASSINATED(task))`
558			`goto die;`
559
560			`if (task->tk_status < 0) {`
561			`dprintk("lockd: unlock failed (err = %d)\n", -task->tk_status);`
562			`goto retry_rebind;`
563			`}`
564			`if (status == NLM_LCK_DENIED_GRACE_PERIOD) {`
565			`rpc_delay(task, NLMCLNT_GRACE_WAIT);`
566			`goto retry_unlock;`
567			`}`
568			`if (status != NLM_LCK_GRANTED)`
569			`printk(KERN_WARNING "lockd: unexpected unlock status: %d\n", status);`
570
571			`die:`
572			`nlm_release_host(req->a_host);`
573			`kfree(req);`
574			`return;`
575			`retry_rebind:`
576			`nlm_rebind_host(req->a_host);`
577			`retry_unlock:`
578			`rpc_restart_call(task);`
579			`}`
580
581			`/*`
582			`* Cancel a blocked lock request.`
583			`* We always use an async RPC call for this in order not to hang a`
584			`* process that has been Ctrl-C'ed.`
585			`*/`
586			`int`
587			`nlmclnt_cancel(struct nlm_host host, struct file_lock fl)`
588			`{`
589			`struct nlm_rqst *req;`
590			`unsigned long flags;`
591			`sigset_t oldset;`
592			`int status;`
593
594			`/* Block all signals while setting up call */`
595			`spin_lock_irqsave(&current->sigmask_lock, flags);`
596			`oldset = current->blocked;`
597			`sigfillset(&current->blocked);`
598			`recalc_sigpending(current);`
599			`spin_unlock_irqrestore(&current->sigmask_lock, flags);`
600
601			`req = nlmclnt_alloc_call();`
602			`if (!req)`
603			`return -ENOMEM;`
604			`req->a_host = host;`
605			`req->a_flags = RPC_TASK_ASYNC;`
606
607			`nlmclnt_setlockargs(req, fl);`
608
609			`status = nlmclnt_async_call(req, NLMPROC_CANCEL,`
610			`nlmclnt_cancel_callback);`
611			`if (status < 0)`
612			`kfree(req);`
613
614			`spin_lock_irqsave(&current->sigmask_lock, flags);`
615			`current->blocked = oldset;`
616			`recalc_sigpending(current);`
617			`spin_unlock_irqrestore(&current->sigmask_lock, flags);`
618
619			`return status;`
620			`}`
621
622			`static void`
623			`nlmclnt_cancel_callback(struct rpc_task *task)`
624			`{`
625			`struct nlm_rqst req = (struct nlm_rqst ) task->tk_calldata;`
626
627			`if (RPC_ASSASSINATED(task))`
628			`goto die;`
629
630			`if (task->tk_status < 0) {`
631			`dprintk("lockd: CANCEL call error %d, retrying.\n",`
632			`task->tk_status);`
633			`goto retry_cancel;`
634			`}`
635
636			`dprintk("lockd: cancel status %d (task %d)\n",`
637			`req->a_res.status, task->tk_pid);`
638
639			`switch (req->a_res.status) {`
640			`case NLM_LCK_GRANTED:`
641			`case NLM_LCK_DENIED_GRACE_PERIOD:`
642			`/* Everything's good */`
643			`break;`
644			`case NLM_LCK_DENIED_NOLOCKS:`
645			`dprintk("lockd: CANCEL failed (server has no locks)\n");`
646			`goto retry_cancel;`
647			`default:`
648			`printk(KERN_NOTICE "lockd: weird return %d for CANCEL call\n",`
649			`req->a_res.status);`
650			`}`
651
652			`die:`
653			`nlm_release_host(req->a_host);`
654			`kfree(req);`
655			`return;`
656
657			`retry_cancel:`
658			`nlm_rebind_host(req->a_host);`
659			`rpc_restart_call(task);`
660			`rpc_delay(task, 30 * HZ);`
661			`}`
662
663			`/*`
664			`* Convert an NLM status code to a generic kernel errno`
665			`*/`
666			`static int`
667			`nlm_stat_to_errno(u32 status)`
668			`{`
669			`switch(status) {`
670			`case NLM_LCK_GRANTED:`
671			`return 0;`
672			`case NLM_LCK_DENIED:`
673			`return -EAGAIN;`
674			`case NLM_LCK_DENIED_NOLOCKS:`
675			`case NLM_LCK_DENIED_GRACE_PERIOD:`
676			`return -ENOLCK;`
677			`case NLM_LCK_BLOCKED:`
678			`printk(KERN_NOTICE "lockd: unexpected status NLM_BLOCKED\n");`
679			`return -ENOLCK;`
680			`#ifdef CONFIG_LOCKD_V4`
681			`case NLM_DEADLCK:`
682			`return -EDEADLK;`
683			`case NLM_ROFS:`
684			`return -EROFS;`
685			`case NLM_STALE_FH:`
686			`return -ESTALE;`
687			`case NLM_FBIG:`
688			`return -EOVERFLOW;`
689			`case NLM_FAILED:`
690			`return -ENOLCK;`
691			`#endif`
692			`}`
693			`printk(KERN_NOTICE "lockd: unexpected server status %d\n", status);`
694			`return -ENOLCK;`
695			`}`