src/afs/NBSD/osi_kmod.c

   1 /*
   2  * Copyright (c) 2011 Jonathan A. Kollasch
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  15  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  16  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  17  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
  18  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  19  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  20  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  21  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  22  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  23  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  24  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #include <afsconfig.h>
  28 #include "afs/param.h"
  29
  30 #include <sys/cdefs.h>
  31 #include <sys/param.h>
  32 #include <sys/types.h>
  33 #include <sys/kernel.h>
  34 #if !defined(AFS_NBSD60_ENV)
  35 #include <sys/lkm.h>
  36 #endif
  37 #include <sys/module.h>
  38 #include <sys/systm.h>
  39 #include <sys/syscall.h>
  40 #include <sys/syscallargs.h>
  41 #include <sys/syscallvar.h>
  42
  43 #include "afs/sysincludes.h"    /* Standard vendor system headers */
  44 #include "afs/afsincludes.h"    /* Afs-based standard headers */
  45
  46 extern int afs3_syscall(struct lwp *, const void *, register_t *);
  47 extern int afs_xioctl(struct lwp *, const void *, register_t *);
  48 extern int Afs_xsetgroups(struct lwp *, const void *, register_t *);
  49
  50 #if !defined(AFS_NBSD60_ENV)
  51 extern int sys_lkmnosys(struct lwp *, const void *, register_t *);
  52 #endif
  53
  54 extern struct vfsops afs_vfsops;
  55
  56 static const struct sysent openafs_sysent = {
  57         sizeof(struct afs_sysargs)/sizeof(register_t),
  58         sizeof(struct afs_sysargs),
  59         0,
  60         afs3_syscall,
  61 };
  62
  63 static struct sysent old_sysent;
  64 static sy_call_t *old_setgroups;
  65 static sy_call_t *old_ioctl;
  66
  67 MODULE(MODULE_CLASS_VFS, openafs, NULL);
  68
  69 #if defined(AFS_NBSD70_ENV)
  70 #define SYS_NOSYSCALL sys_nomodule
  71 #elif defined(AFS_NBSD60_ENV)
  72 #define SYS_NOSYSCALL sys_nosys
  73 #else
  74 #define SYS_NOSYSCALL sys_lkmnosys
  75 #endif
  76
  77 static int
  78 openafs_modcmd(modcmd_t cmd, void *arg)
  79 {
  80         struct sysent *se;
  81         int error;
  82
  83 #ifndef RUMP
  84         se = sysent;
  85 #else
  86         se = emul_netbsd.e_sysent;
  87 #endif
  88
  89         switch (cmd) {
  90         case MODULE_CMD_INIT:
  91                 error = vfs_attach(&afs_vfsops);
  92                 if (error != 0)
  93                         break;
  94                 old_sysent = se[AFS_SYSCALL];
  95                 old_setgroups = se[SYS_setgroups].sy_call;
  96                 old_ioctl = se[SYS_ioctl].sy_call;
  97
  98 #if defined(RUMP)
  99                 if (true) {
 100 #else
 101                 if (old_sysent.sy_call == SYS_NOSYSCALL) {
 102 #endif
 103 #if defined(AFS_NBSD60_ENV)
 104                         kernconfig_lock();
 105 #endif
 106                         se[AFS_SYSCALL] = openafs_sysent;
 107                         se[SYS_setgroups].sy_call = Afs_xsetgroups;
 108                         se[SYS_ioctl].sy_call = afs_xioctl;
 109 #if defined(AFS_NBSD60_ENV)
 110                         kernconfig_unlock();
 111 #endif
 112                 } else {
 113                         error = EBUSY;
 114                 }
 115                 if (error != 0)
 116                         break;
 117                 break;
 118         case MODULE_CMD_FINI:
 119 #if defined(AFS_NBSD60_ENV)
 120                 kernconfig_lock();
 121 #endif
 122                 se[SYS_ioctl].sy_call = old_ioctl;
 123                 se[SYS_setgroups].sy_call = old_setgroups;
 124                 se[AFS_SYSCALL] = old_sysent;
 125 #if defined(AFS_NBSD60_ENV)
 126                 kernconfig_unlock();
 127 #endif
 128                 error = vfs_detach(&afs_vfsops);
 129                 if (error != 0)
 130                         break;
 131                 break;
 132 #if defined(AFS_NBSD70_ENV)
 133         case MODULE_CMD_AUTOUNLOAD:
 134                 error = EBUSY;
 135                 break;
 136 #endif
 137         default:
 138                 error = ENOTTY;
 139                 break;
 140         }
 141
 142         return error;
 143 }