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/sys/osd.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD$
   29  */
   30 
   31 #ifndef _SYS_OSD_H_
   32 #define _SYS_OSD_H_
   33 
   34 #include <sys/queue.h>
   35 
   36 /*
   37  * Lock key:
   38  *   (c) container lock (e.g. jail's pr_mtx) and/or osd_object_lock
   39  *   (l) osd_list_lock
   40  */
   41 struct osd {
   42         u_int             osd_nslots;   /* (c) */
   43         void            **osd_slots;    /* (c) */
   44         LIST_ENTRY(osd)   osd_next;     /* (l) */
   45 };
   46 
   47 #ifdef _KERNEL
   48 
   49 #define OSD_THREAD      0
   50 #define OSD_JAIL        1
   51 #define OSD_KHELP       2
   52 
   53 #define OSD_FIRST       OSD_THREAD
   54 #define OSD_LAST        OSD_KHELP
   55 
   56 typedef void (*osd_destructor_t)(void *value);
   57 typedef int (*osd_method_t)(void *obj, void *data);
   58 
   59 int osd_register(u_int type, osd_destructor_t destructor,
   60     osd_method_t *methods);
   61 void osd_deregister(u_int type, u_int slot);
   62 
   63 int osd_set(u_int type, struct osd *osd, u_int slot, void *value);
   64 void **osd_reserve(u_int slot);
   65 int osd_set_reserved(u_int type, struct osd *osd, u_int slot, void **rsv,
   66     void *value);
   67 void osd_free_reserved(void **rsv);
   68 void *osd_get(u_int type, struct osd *osd, u_int slot);
   69 void osd_del(u_int type, struct osd *osd, u_int slot);
   70 int osd_call(u_int type, u_int method, void *obj, void *data);
   71 
   72 void osd_exit(u_int type, struct osd *osd);
   73 
   74 #define osd_thread_register(destructor)                                 \
   75         osd_register(OSD_THREAD, (destructor), NULL)
   76 #define osd_thread_deregister(slot)                                     \
   77         osd_deregister(OSD_THREAD, (slot))
   78 #define osd_thread_set(td, slot, value)                                 \
   79         osd_set(OSD_THREAD, &(td)->td_osd, (slot), (value))
   80 #define osd_thread_set_reserved(td, slot, rsv, value)                   \
   81         osd_set_reserved(OSD_THREAD, &(td)->td_osd, (slot), (rsv), (value))
   82 #define osd_thread_get(td, slot)                                        \
   83         osd_get(OSD_THREAD, &(td)->td_osd, (slot))
   84 #define osd_thread_del(td, slot)        do {                            \
   85         KASSERT((td) == curthread, ("Not curthread."));                 \
   86         osd_del(OSD_THREAD, &(td)->td_osd, (slot));                     \
   87 } while (0)
   88 #define osd_thread_call(td, method, data)                               \
   89         osd_call(OSD_THREAD, (method), (td), (data))
   90 #define osd_thread_exit(td)                                             \
   91         osd_exit(OSD_THREAD, &(td)->td_osd)
   92 
   93 #define osd_jail_register(destructor, methods)                          \
   94         osd_register(OSD_JAIL, (destructor), (methods))
   95 #define osd_jail_deregister(slot)                                       \
   96         osd_deregister(OSD_JAIL, (slot))
   97 #define osd_jail_set(pr, slot, value)                                   \
   98         osd_set(OSD_JAIL, &(pr)->pr_osd, (slot), (value))
   99 #define osd_jail_set_reserved(pr, slot, rsv, value)                     \
  100         osd_set_reserved(OSD_JAIL, &(pr)->pr_osd, (slot), (rsv), (value))
  101 #define osd_jail_get(pr, slot)                                          \
  102         osd_get(OSD_JAIL, &(pr)->pr_osd, (slot))
  103 #define osd_jail_del(pr, slot)                                          \
  104         osd_del(OSD_JAIL, &(pr)->pr_osd, (slot))
  105 #define osd_jail_call(pr, method, data)                                 \
  106         osd_call(OSD_JAIL, (method), (pr), (data))
  107 #define osd_jail_exit(pr)                                               \
  108         osd_exit(OSD_JAIL, &(pr)->pr_osd)
  109 
  110 #endif  /* _KERNEL */
  111 
  112 #endif  /* !_SYS_OSD_H_ */

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