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


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/fs/pseudofs/pseudofs_fileno.c

Version: -  FREEBSD  -  FREEBSD-13-STABLE  -  FREEBSD-13-0  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  l41  -  OPENBSD  -  linux-2.6  -  MK84  -  PLAN9  -  xnu-8792 
SearchContext: -  none  -  3  -  10 

    1 /*-
    2  * Copyright (c) 2001 Dag-Erling Co´dan Sm°rgrav
    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  *    in this position and unchanged.
   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  * 3. The name of the author may not be used to endorse or promote products
   15  *    derived from this software without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: releng/6.4/sys/fs/pseudofs/pseudofs_fileno.c 170191 2007-06-01 20:56:18Z des $");
   31 
   32 #include "opt_pseudofs.h"
   33 
   34 #include <sys/param.h>
   35 #include <sys/kernel.h>
   36 #include <sys/systm.h>
   37 #include <sys/limits.h>
   38 #include <sys/lock.h>
   39 #include <sys/malloc.h>
   40 #include <sys/mutex.h>
   41 #include <sys/proc.h>
   42 #include <sys/sysctl.h>
   43 #include <sys/systm.h>
   44 
   45 #include <fs/pseudofs/pseudofs.h>
   46 #include <fs/pseudofs/pseudofs_internal.h>
   47 
   48 /*
   49  * Initialize fileno bitmap
   50  */
   51 void
   52 pfs_fileno_init(struct pfs_info *pi)
   53 {
   54 
   55         mtx_assert(&Giant, MA_OWNED);
   56         mtx_init(&pi->pi_mutex, "pfs_fileno", NULL, MTX_DEF);
   57         pi->pi_unrhdr = new_unrhdr(3, INT_MAX / NO_PID, &pi->pi_mutex);
   58 }
   59 
   60 /*
   61  * Tear down fileno bitmap
   62  */
   63 void
   64 pfs_fileno_uninit(struct pfs_info *pi)
   65 {
   66 
   67         mtx_assert(&Giant, MA_OWNED);
   68         delete_unrhdr(pi->pi_unrhdr);
   69         pi->pi_unrhdr = NULL;
   70         mtx_destroy(&pi->pi_mutex);
   71 }
   72 
   73 /*
   74  * Allocate a file number
   75  */
   76 void
   77 pfs_fileno_alloc(struct pfs_node *pn)
   78 {
   79 
   80         /* make sure our parent has a file number */
   81         if (pn->pn_parent && !pn->pn_parent->pn_fileno)
   82                 pfs_fileno_alloc(pn->pn_parent);
   83 
   84         switch (pn->pn_type) {
   85         case pfstype_root:
   86                 /* root must always be 2 */
   87                 pn->pn_fileno = 2;
   88                 break;
   89         case pfstype_dir:
   90         case pfstype_file:
   91         case pfstype_symlink:
   92         case pfstype_procdir:
   93                 pn->pn_fileno = alloc_unr(pn->pn_info->pi_unrhdr);
   94                 break;
   95         case pfstype_this:
   96                 KASSERT(pn->pn_parent != NULL,
   97                     ("pfstype_this node has no parent"));
   98                 pn->pn_fileno = pn->pn_parent->pn_fileno;
   99                 break;
  100         case pfstype_parent:
  101                 KASSERT(pn->pn_parent != NULL,
  102                     ("pfstype_parent node has no parent"));
  103                 if (pn->pn_parent == pn->pn_info->pi_root) {
  104                         pn->pn_fileno = pn->pn_parent->pn_fileno;
  105                         break;
  106                 }
  107                 KASSERT(pn->pn_parent->pn_parent != NULL,
  108                     ("pfstype_parent node has no grandparent"));
  109                 pn->pn_fileno = pn->pn_parent->pn_parent->pn_fileno;
  110                 break;
  111         case pfstype_none:
  112                 KASSERT(0,
  113                     ("pfs_fileno_alloc() called for pfstype_none node"));
  114                 break;
  115         }
  116 
  117 #if 0
  118         printf("pfs_fileno_alloc(): %s: ", pn->pn_info->pi_name);
  119         if (pn->pn_parent) {
  120                 if (pn->pn_parent->pn_parent) {
  121                         printf("%s/", pn->pn_parent->pn_parent->pn_name);
  122                 }
  123                 printf("%s/", pn->pn_parent->pn_name);
  124         }
  125         printf("%s -> %d\n", pn->pn_name, pn->pn_fileno);
  126 #endif
  127 }
  128 
  129 /*
  130  * Release a file number
  131  */
  132 void
  133 pfs_fileno_free(struct pfs_node *pn)
  134 {
  135 
  136         switch (pn->pn_type) {
  137         case pfstype_root:
  138                 /* not allocated from unrhdr */
  139                 return;
  140         case pfstype_dir:
  141         case pfstype_file:
  142         case pfstype_symlink:
  143         case pfstype_procdir:
  144                 free_unr(pn->pn_info->pi_unrhdr, pn->pn_fileno);
  145                 break;
  146         case pfstype_this:
  147         case pfstype_parent:
  148                 /* ignore these, as they don't "own" their file number */
  149                 break;
  150         case pfstype_none:
  151                 KASSERT(0,
  152                     ("pfs_fileno_free() called for pfstype_none node"));
  153                 break;
  154         }
  155 }

Cache object: c34d28fd6e2b07570f3f655907d13815


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.