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/fs/pseudofs/pseudofs_fileno.c

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    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/6.0/sys/fs/pseudofs/pseudofs_fileno.c 143841 2005-03-19 08:22:36Z phk $");
   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/sysctl.h>
   42 
   43 #include <fs/pseudofs/pseudofs.h>
   44 #include <fs/pseudofs/pseudofs_internal.h>
   45 
   46 /*
   47  * Initialize fileno bitmap
   48  */
   49 void
   50 pfs_fileno_init(struct pfs_info *pi)
   51 {
   52         struct unrhdr *up;
   53 
   54         up = new_unrhdr(3, INT_MAX, &pi->pi_mutex);
   55         mtx_lock(&pi->pi_mutex);
   56         pi->pi_unrhdr = up;
   57         pi->pi_root->pn_fileno = 2;
   58         mtx_unlock(&pi->pi_mutex);
   59 }
   60 
   61 /*
   62  * Tear down fileno bitmap
   63  */
   64 void
   65 pfs_fileno_uninit(struct pfs_info *pi)
   66 {
   67         struct unrhdr *up;
   68 
   69         mtx_lock(&pi->pi_mutex);
   70 
   71         up = pi->pi_unrhdr;
   72         pi->pi_unrhdr = NULL;
   73 
   74         mtx_unlock(&pi->pi_mutex);
   75 
   76         delete_unrhdr(up);
   77 }
   78 
   79 /*
   80  * Allocate a file number
   81  */
   82 void
   83 pfs_fileno_alloc(struct pfs_info *pi, struct pfs_node *pn)
   84 {
   85         /* make sure our parent has a file number */
   86         if (pn->pn_parent && !pn->pn_parent->pn_fileno)
   87                 pfs_fileno_alloc(pi, pn->pn_parent);
   88 
   89         switch (pn->pn_type) {
   90         case pfstype_root:
   91         case pfstype_dir:
   92         case pfstype_file:
   93         case pfstype_symlink:
   94         case pfstype_procdir:
   95                 pn->pn_fileno = alloc_unr(pi->pi_unrhdr);
   96                 break;
   97         case pfstype_this:
   98                 KASSERT(pn->pn_parent != NULL,
   99                     ("pfstype_this node has no parent"));
  100                 pn->pn_fileno = pn->pn_parent->pn_fileno;
  101                 break;
  102         case pfstype_parent:
  103                 KASSERT(pn->pn_parent != NULL,
  104                     ("pfstype_parent node has no parent"));
  105                 if (pn->pn_parent == pi->pi_root) {
  106                         pn->pn_fileno = pn->pn_parent->pn_fileno;
  107                         break;
  108                 }
  109                 KASSERT(pn->pn_parent->pn_parent != NULL,
  110                     ("pfstype_parent node has no grandparent"));
  111                 pn->pn_fileno = pn->pn_parent->pn_parent->pn_fileno;
  112                 break;
  113         case pfstype_none:
  114                 KASSERT(0,
  115                     ("pfs_fileno_alloc() called for pfstype_none node"));
  116                 break;
  117         }
  118 
  119 #if 0
  120         printf("pfs_fileno_alloc(): %s: ", pi->pi_name);
  121         if (pn->pn_parent) {
  122                 if (pn->pn_parent->pn_parent) {
  123                         printf("%s/", pn->pn_parent->pn_parent->pn_name);
  124                 }
  125                 printf("%s/", pn->pn_parent->pn_name);
  126         }
  127         printf("%s -> %d\n", pn->pn_name, pn->pn_fileno);
  128 #endif
  129 }
  130 
  131 /*
  132  * Release a file number
  133  */
  134 void
  135 pfs_fileno_free(struct pfs_info *pi, struct pfs_node *pn)
  136 {
  137         switch (pn->pn_type) {
  138         case pfstype_root:
  139         case pfstype_dir:
  140         case pfstype_file:
  141         case pfstype_symlink:
  142         case pfstype_procdir:
  143                 free_unr(pi->pi_unrhdr, pn->pn_fileno);
  144                 break;
  145         case pfstype_this:
  146         case pfstype_parent:
  147                 /* ignore these, as they don't "own" their file number */
  148                 break;
  149         case pfstype_none:
  150                 KASSERT(0,
  151                     ("pfs_fileno_free() called for pfstype_none node"));
  152                 break;
  153         }
  154 }

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