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("$FreeBSD$");
   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         if (pn->pn_parent)
   81                 PFS_TRACE(("%s/%s", pn->pn_parent->pn_name, pn->pn_name));
   82         else
   83                 PFS_TRACE(("%s", pn->pn_name));
   84         pfs_assert_not_owned(pn);
   85 
   86         switch (pn->pn_type) {
   87         case pfstype_root:
   88                 /* root must always be 2 */
   89                 pn->pn_fileno = 2;
   90                 break;
   91         case pfstype_dir:
   92         case pfstype_file:
   93         case pfstype_symlink:
   94         case pfstype_procdir:
   95                 pn->pn_fileno = alloc_unr(pn->pn_info->pi_unrhdr);
   96                 break;
   97         case pfstype_this:
   98                 KASSERT(pn->pn_parent != NULL,
   99                     ("%s(): pfstype_this node has no parent", __func__));
  100                 pn->pn_fileno = pn->pn_parent->pn_fileno;
  101                 break;
  102         case pfstype_parent:
  103                 KASSERT(pn->pn_parent != NULL,
  104                     ("%s(): pfstype_parent node has no parent", __func__));
  105                 if (pn->pn_parent->pn_type == pfstype_root) {
  106                         pn->pn_fileno = pn->pn_parent->pn_fileno;
  107                         break;
  108                 }
  109                 KASSERT(pn->pn_parent->pn_parent != NULL,
  110                     ("%s(): pfstype_parent node has no grandparent", __func__));
  111                 pn->pn_fileno = pn->pn_parent->pn_parent->pn_fileno;
  112                 break;
  113         case pfstype_none:
  114                 KASSERT(0,
  115                     ("%s(): pfstype_none node", __func__));
  116                 break;
  117         }
  118 
  119 #if 0
  120         printf("%s(): %s: ", __func__, pn->pn_info->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_node *pn)
  136 {
  137 
  138         pfs_assert_not_owned(pn);
  139 
  140         switch (pn->pn_type) {
  141         case pfstype_root:
  142                 /* not allocated from unrhdr */
  143                 return;
  144         case pfstype_dir:
  145         case pfstype_file:
  146         case pfstype_symlink:
  147         case pfstype_procdir:
  148                 free_unr(pn->pn_info->pi_unrhdr, pn->pn_fileno);
  149                 break;
  150         case pfstype_this:
  151         case pfstype_parent:
  152                 /* ignore these, as they don't "own" their file number */
  153                 break;
  154         case pfstype_none:
  155                 KASSERT(0,
  156                     ("pfs_fileno_free() called for pfstype_none node"));
  157                 break;
  158         }
  159 }

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