lib/libpuffs/pnode.c

   1 /*      $NetBSD: pnode.c,v 1.10 2008/08/12 19:44:39 pooka Exp $ */
   2
   3 /*
   4  * Copyright (c) 2006 Antti Kantee.  All Rights Reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  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  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
  16  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  18  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  */
  27
  28 #include <sys/cdefs.h>
  29 #if !defined(lint)
  30 __RCSID("$NetBSD: pnode.c,v 1.10 2008/08/12 19:44:39 pooka Exp $");
  31 #endif /* !lint */
  32
  33 #include <minix/type.h>
  34 #include <sys/types.h>
  35
  36 #include <assert.h>
  37 #include <stdlib.h>
  38 #include <stdio.h>
  39 #include <string.h>
  40
  41 #include "puffs.h"
  42 #include "puffs_priv.h"
  43 #include "proto.h"
  44
  45 /*
  46  * Well, you're probably wondering why this isn't optimized.
  47  * The reason is simple: my available time is not optimized for
  48  * size ... so please be patient ;)
  49  */
  50 struct puffs_node *
  51 puffs_pn_new(struct puffs_usermount *pu, void *privdata)
  52 {
  53         struct puffs_node *pn;
  54
  55         pn = calloc(1, sizeof(struct puffs_node));
  56         if (pn == NULL)
  57                 return NULL;
  58
  59         pn->pn_data = privdata;
  60         pn->pn_mnt = pu;
  61         puffs_vattr_null(&pn->pn_va);
  62
  63         LIST_INSERT_HEAD(&pu->pu_pnodelst, pn, pn_entries);
  64
  65         return pn;
  66 }
  67
  68 void
  69 puffs_pn_remove(struct puffs_node *pn)
  70 {
  71         struct puffs_usermount *pu = pn->pn_mnt;
  72         assert(pu != NULL);
  73
  74         LIST_REMOVE(pn, pn_entries);
  75         pn->pn_flags |= PUFFS_NODE_REMOVED;
  76         if (pn->pn_count != 0) {
  77                 /* XXX FS removes this pn from the list to prevent further
  78                  * lookups from finding node after remove/rm/rename op.
  79                  * But VFS still uses it, i.e. pnode is still open, and
  80                  * will put it later. Keep it in separate list to do reclaim
  81                  * in fs_put().
  82                  */
  83                 LIST_INSERT_HEAD(&pu->pu_pnode_removed_lst, pn, pn_entries);
  84         }
  85 }
  86
  87 void
  88 puffs_pn_put(struct puffs_node *pn)
  89 {
  90         struct puffs_usermount *pu = pn->pn_mnt;
  91
  92         pu->pu_pathfree(pu, &pn->pn_po);
  93         /* Removes either from pu_pnodelst or pu_pnode_removed_lst */
  94         LIST_REMOVE(pn, pn_entries);
  95         free(pn);
  96 }
  97
  98 /* walk list, rv can be used either to halt or to return a value
  99  * XXX (MINIX note): if fn is 0, then arg is ino_t and we search
 100  * node with ino_t. TODO: modify docs.
 101  */
 102 void *
 103 puffs_pn_nodewalk(struct puffs_usermount *pu, puffs_nodewalk_fn fn, void *arg)
 104 {
 105         struct puffs_node *pn_cur, *pn_next;
 106         void *rv;
 107
 108         pn_cur = LIST_FIRST(&pu->pu_pnodelst);
 109         while (pn_cur) {
 110                 pn_next = LIST_NEXT(pn_cur, pn_entries);
 111                 if (fn) {
 112                         rv = fn(pu, pn_cur, arg);
 113                         if (rv)
 114                                 return rv;
 115                 } else {
 116                         if (pn_cur->pn_va.va_fileid == *((ino_t*) arg))
 117                                 return pn_cur;
 118                 }
 119                 pn_cur = pn_next;
 120         }
 121
 122         return NULL;
 123 }
 124
 125 void*
 126 puffs_pn_nodeprint(struct puffs_usermount *pu, struct puffs_node *pn, void *arg)
 127 {
 128         /* If arg is specified, print only pnodes with inum (should be only one,
 129          * otherwise - all.
 130          */
 131         if (arg != NULL) {
 132                 ino_t inum = *(ino_t*)arg;
 133                 if (pn->pn_va.va_fileid != inum) {
 134                         return NULL;
 135                 }
 136         }
 137         lpuffs_debug(" ino %ld used %d %s\n", pn->pn_va.va_fileid, pn->pn_count,
 138                                 pn->pn_po.po_path);
 139         /* If arg specified, it should be the only one pnode to be printed,
 140          * but we walk through the rest of list for debugging purposes.
 141          */
 142         return NULL;
 143 }
 144
 145 void
 146 puffs_pn_nodeprintall(struct puffs_usermount *pu)
 147 {
 148         puffs_pn_nodewalk(pu, puffs_pn_nodeprint, NULL);
 149 }
 150
 151 struct vattr *
 152 puffs_pn_getvap(struct puffs_node *pn)
 153 {
 154
 155         return &pn->pn_va;
 156 }
 157
 158 void *
 159 puffs_pn_getpriv(struct puffs_node *pn)
 160 {
 161
 162         return pn->pn_data;
 163 }
 164
 165 void
 166 puffs_pn_setpriv(struct puffs_node *pn, void *priv)
 167 {
 168
 169         pn->pn_data = priv;
 170 }
 171
 172 struct puffs_pathobj *
 173 puffs_pn_getpo(struct puffs_node *pn)
 174 {
 175
 176         return &pn->pn_po;
 177 }
 178
 179 struct puffs_usermount *
 180 puffs_pn_getmnt(struct puffs_node *pn)
 181 {
 182
 183         return pn->pn_mnt;
 184 }
 185
 186 /* convenience / shortcut */
 187 void *
 188 puffs_pn_getmntspecific(struct puffs_node *pn)
 189 {
 190
 191         return pn->pn_mnt->pu_privdata;
 192 }
 193
 194 /*
 195  * newnode parameters
 196  */
 197 void
 198 puffs_newinfo_setcookie(struct puffs_newinfo *pni, puffs_cookie_t cookie)
 199 {
 200
 201         *pni->pni_cookie = cookie;
 202 }
 203
 204 void
 205 puffs_newinfo_setvtype(struct puffs_newinfo *pni, enum vtype vt)
 206 {
 207
 208         *pni->pni_vtype = vt;
 209 }
 210
 211 void
 212 puffs_newinfo_setsize(struct puffs_newinfo *pni, voff_t size)
 213 {
 214
 215         *pni->pni_size = size;
 216 }
 217
 218 void
 219 puffs_newinfo_setrdev(struct puffs_newinfo *pni, dev_t rdev)
 220 {
 221
 222         *pni->pni_rdev = rdev;
 223 }