The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/nlm/nlm.h

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    1 /*-
    2  * Copyright (c) 2008 Isilon Inc http://www.isilon.com/
    3  * Authors: Doug Rabson <dfr@rabson.org>
    4  * Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org>
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  *
   27  * $FreeBSD: releng/11.2/sys/nlm/nlm.h 197840 2009-10-07 19:50:14Z zml $
   28  */
   29 
   30 #ifndef _NLM_NLM_H_
   31 #define _NLM_NLM_H_
   32 
   33 #ifdef _KERNEL
   34 
   35 #ifdef _SYS_MALLOC_H_
   36 MALLOC_DECLARE(M_NLM);
   37 #endif
   38 
   39 /*
   40  * This value is added to host system IDs when recording NFS client
   41  * locks in the local lock manager.
   42  */
   43 #define NLM_SYSID_CLIENT        0x1000000
   44 
   45 struct nlm_host;
   46 struct vnode;
   47 
   48 extern struct timeval nlm_zero_tv;
   49 extern int nlm_nsm_state;
   50 
   51 /*
   52  * Make a struct netobj.
   53  */ 
   54 extern void nlm_make_netobj(struct netobj *dst, caddr_t srt,
   55     size_t srcsize, struct malloc_type *type);
   56 
   57 /*
   58  * Copy a struct netobj.
   59  */ 
   60 extern void nlm_copy_netobj(struct netobj *dst, struct netobj *src,
   61     struct malloc_type *type);
   62 
   63 /*
   64  * Search for an existing NLM host that matches the given name
   65  * (typically the caller_name element of an nlm4_lock).  If none is
   66  * found, create a new host. If 'addr' is non-NULL, record the remote
   67  * address of the host so that we can call it back for async
   68  * responses. If 'vers' is greater than zero then record the NLM
   69  * program version to use to communicate with this client. The host
   70  * reference count is incremented - the caller must call
   71  * nlm_host_release when it has finished using it.
   72  */
   73 extern struct nlm_host *nlm_find_host_by_name(const char *name,
   74     const struct sockaddr *addr, rpcvers_t vers);
   75 
   76 /*
   77  * Search for an existing NLM host that matches the given remote
   78  * address. If none is found, create a new host with the requested
   79  * address and remember 'vers' as the NLM protocol version to use for
   80  * that host. The host reference count is incremented - the caller
   81  * must call nlm_host_release when it has finished using it.
   82  */
   83 extern struct nlm_host *nlm_find_host_by_addr(const struct sockaddr *addr,
   84     int vers);
   85 
   86 /*
   87  * Register this NLM host with the local NSM so that we can be
   88  * notified if it reboots.
   89  */
   90 extern void nlm_host_monitor(struct nlm_host *host, int state);
   91 
   92 /*
   93  * Decrement the host reference count, freeing resources if the
   94  * reference count reaches zero.
   95  */
   96 extern void nlm_host_release(struct nlm_host *host);
   97 
   98 /*
   99  * Return an RPC client handle that can be used to talk to the NLM
  100  * running on the given host.
  101  */
  102 extern CLIENT *nlm_host_get_rpc(struct nlm_host *host, bool_t isserver);
  103 
  104 /*
  105  * Return the system ID for a host.
  106  */
  107 extern int nlm_host_get_sysid(struct nlm_host *host);
  108 
  109 /*
  110  * Return the remote NSM state value for a host.
  111  */
  112 extern int nlm_host_get_state(struct nlm_host *host);
  113 
  114 /*
  115  * When sending a blocking lock request, we need to track the request
  116  * in our waiting lock list. We add an entry to the waiting list
  117  * before we send the lock RPC so that we can cope with a granted
  118  * message arriving at any time. Call this function before sending the
  119  * lock rpc. If the lock succeeds, call nlm_deregister_wait_lock with
  120  * the handle this function returns, otherwise nlm_wait_lock. Both
  121  * will remove the entry from the waiting list.
  122  */
  123 extern void *nlm_register_wait_lock(struct nlm4_lock *lock, struct vnode *vp);
  124 
  125 /*
  126  * Deregister a blocking lock request. Call this if the lock succeeded
  127  * without blocking.
  128  */
  129 extern void nlm_deregister_wait_lock(void *handle);
  130 
  131 /*
  132  * Wait for a granted callback for a blocked lock request, waiting at
  133  * most timo ticks. If no granted message is received within the
  134  * timeout, return EWOULDBLOCK. If a signal interrupted the wait,
  135  * return EINTR - the caller must arrange to send a cancellation to
  136  * the server. In both cases, the request is removed from the waiting
  137  * list.
  138  */
  139 extern int nlm_wait_lock(void *handle, int timo);
  140 
  141 /*
  142  * Cancel any pending waits for this vnode - called on forcible unmounts.
  143  */
  144 extern void nlm_cancel_wait(struct vnode *vp);
  145 
  146 /*
  147  * Called when a host restarts.
  148  */
  149 extern void nlm_sm_notify(nlm_sm_status *argp);
  150 
  151 /*
  152  * Implementation for lock testing RPCs. If the request was handled
  153  * successfully and rpcp is non-NULL, *rpcp is set to an RPC client
  154  * handle which can be used to send an async rpc reply. Returns zero
  155  * if the request was handled, or a suitable unix error code
  156  * otherwise.
  157  */
  158 extern int nlm_do_test(nlm4_testargs *argp, nlm4_testres *result,
  159     struct svc_req *rqstp, CLIENT **rpcp);
  160 
  161 /*
  162  * Implementation for lock setting RPCs. If the request was handled
  163  * successfully and rpcp is non-NULL, *rpcp is set to an RPC client
  164  * handle which can be used to send an async rpc reply. Returns zero
  165  * if the request was handled, or a suitable unix error code
  166  * otherwise.
  167  */
  168 extern int nlm_do_lock(nlm4_lockargs *argp, nlm4_res *result,
  169     struct svc_req *rqstp, bool_t monitor, CLIENT **rpcp); 
  170 
  171 /*
  172  * Implementation for cancelling a pending lock request. If the
  173  * request was handled successfully and rpcp is non-NULL, *rpcp is set
  174  * to an RPC client handle which can be used to send an async rpc
  175  * reply. Returns zero if the request was handled, or a suitable unix
  176  * error code otherwise.
  177  */
  178 extern int nlm_do_cancel(nlm4_cancargs *argp, nlm4_res *result,
  179     struct svc_req *rqstp, CLIENT **rpcp);
  180 
  181 /*
  182  * Implementation for unlocking RPCs. If the request was handled
  183  * successfully and rpcp is non-NULL, *rpcp is set to an RPC client
  184  * handle which can be used to send an async rpc reply. Returns zero
  185  * if the request was handled, or a suitable unix error code
  186  * otherwise.
  187  */
  188 extern int nlm_do_unlock(nlm4_unlockargs *argp, nlm4_res *result,
  189     struct svc_req *rqstp, CLIENT **rpcp);
  190 
  191 /*
  192  * Implementation for granted RPCs. If the request was handled
  193  * successfully and rpcp is non-NULL, *rpcp is set to an RPC client
  194  * handle which can be used to send an async rpc reply. Returns zero
  195  * if the request was handled, or a suitable unix error code
  196  * otherwise.
  197  */
  198 extern int nlm_do_granted(nlm4_testargs *argp, nlm4_res *result,
  199     struct svc_req *rqstp, CLIENT **rpcp);
  200 
  201 /*
  202  * Implementation for the granted result RPC. The client may reject the granted
  203  * message, in which case we need to handle it appropriately.
  204  */
  205 extern void nlm_do_granted_res(nlm4_res *argp, struct svc_req *rqstp);
  206 
  207 /*
  208  * Free all locks associated with the hostname argp->name.
  209  */
  210 extern void nlm_do_free_all(nlm4_notify *argp);
  211 
  212 /*
  213  * Recover client lock state after a server reboot.
  214  */
  215 extern void nlm_client_recovery(struct nlm_host *);
  216 
  217 /*
  218  * Interface from NFS client code to the NLM.
  219  */
  220 struct vop_advlock_args;
  221 struct vop_reclaim_args;
  222 extern int nlm_advlock(struct vop_advlock_args *ap);
  223 extern int nlm_reclaim(struct vop_reclaim_args *ap);
  224 
  225 /*
  226  * Acquire the next sysid for remote locks not handled by the NLM.
  227  */
  228 extern uint32_t nlm_acquire_next_sysid(void);
  229 
  230 #endif
  231 
  232 #endif

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