lib/libpuffs/pnode.c

   1 /*      $NetBSD: pnode.c,v 1.13 2012/08/16 09:25:43 manu 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 1.13 2012/08/16 09:25:43 manu Exp $");
  31 #endif /* !lint */
  32
  33 #include <sys/types.h>
  34
  35 #include <assert.h>
  36 #include <puffs.h>
  37 #include <stdlib.h>
  38 #include <stdio.h>
  39 #include <string.h>
  40
  41 #include "puffs_priv.h"
  42 #if defined(__minix)
  43 #include <minix/type.h>
  44 #include "proto.h"
  45 #endif /* defined(__minix) */
  46
  47 /*
  48  * Well, you're probably wondering why this isn't optimized.
  49  * The reason is simple: my available time is not optimized for
  50  * size ... so please be patient ;)
  51  */
  52 struct puffs_node *
  53 puffs_pn_new(struct puffs_usermount *pu, void *privdata)
  54 {
  55         struct puffs_node *pn;
  56
  57         pn = calloc(1, sizeof(struct puffs_node));
  58         if (pn == NULL)
  59                 return NULL;
  60
  61         pn->pn_data = privdata;
  62         pn->pn_mnt = pu;
  63         puffs_vattr_null(&pn->pn_va);
  64
  65         LIST_INSERT_HEAD(&pu->pu_pnodelst, pn, pn_entries);
  66
  67         pu->pu_flags |= PUFFS_FLAG_PNCOOKIE;
  68
  69         return pn;
  70 }
  71
  72 void
  73 puffs_pn_remove(struct puffs_node *pn)
  74 {
  75         struct puffs_usermount *pu = pn->pn_mnt;
  76         assert(pu != NULL);
  77
  78         LIST_REMOVE(pn, pn_entries);
  79         pn->pn_flags |= PUFFS_NODE_REMOVED;
  80         if (pn->pn_count != 0) {
  81                 /* XXX FS removes this pn from the list to prevent further
  82                  * lookups from finding node after remove/rm/rename op.
  83                  * But VFS still uses it, i.e. pnode is still open, and
  84                  * will put it later. Keep it in separate list to do reclaim
  85                  * in fs_put().
  86                  */
  87                 LIST_INSERT_HEAD(&pu->pu_pnode_removed_lst, pn, pn_entries);
  88         }
  89 }
  90
  91 void
  92 puffs_pn_put(struct puffs_node *pn)
  93 {
  94         struct puffs_usermount *pu = pn->pn_mnt;
  95
  96         pu->pu_pathfree(pu, &pn->pn_po);
  97         if ((pn->pn_flags & PUFFS_NODE_REMOVED) == 0)
  98                 LIST_REMOVE(pn, pn_entries);
  99         free(pn);
 100 }
 101
 102 /* walk list, rv can be used either to halt or to return a value
 103  * XXX (MINIX note): if fn is 0, then arg is ino_t and we search
 104  * node with ino_t. TODO: modify docs.
 105  */
 106 void *
 107 puffs_pn_nodewalk(struct puffs_usermount *pu, puffs_nodewalk_fn fn, void *arg)
 108 {
 109         struct puffs_node *pn_cur, *pn_next;
 110         void *rv;
 111
 112         pn_cur = LIST_FIRST(&pu->pu_pnodelst);
 113         while (pn_cur) {
 114                 pn_next = LIST_NEXT(pn_cur, pn_entries);
 115                 if (fn) {
 116                         rv = fn(pu, pn_cur, arg);
 117                         if (rv)
 118                                 return rv;
 119                 } else {
 120                         if (pn_cur->pn_va.va_fileid == *((ino_t*) arg))
 121                                 return pn_cur;
 122                 }
 123                 pn_cur = pn_next;
 124         }
 125
 126         return NULL;
 127 }
 128
 129 struct vattr *
 130 puffs_pn_getvap(struct puffs_node *pn)
 131 {
 132
 133         return &pn->pn_va;
 134 }
 135
 136 void *
 137 puffs_pn_getpriv(struct puffs_node *pn)
 138 {
 139
 140         return pn->pn_data;
 141 }
 142
 143 void
 144 puffs_pn_setpriv(struct puffs_node *pn, void *priv)
 145 {
 146
 147         pn->pn_data = priv;
 148 }
 149
 150 struct puffs_pathobj *
 151 puffs_pn_getpo(struct puffs_node *pn)
 152 {
 153
 154         return &pn->pn_po;
 155 }
 156
 157 struct puffs_usermount *
 158 puffs_pn_getmnt(struct puffs_node *pn)
 159 {
 160
 161         return pn->pn_mnt;
 162 }
 163
 164 /* convenience / shortcut */
 165 void *
 166 puffs_pn_getmntspecific(struct puffs_node *pn)
 167 {
 168
 169         return pn->pn_mnt->pu_privdata;
 170 }
 171
 172 /*
 173  * newnode parameters
 174  */
 175 void
 176 puffs_newinfo_setcookie(struct puffs_newinfo *pni, puffs_cookie_t cookie)
 177 {
 178
 179         *pni->pni_cookie = cookie;
 180 }
 181
 182 void
 183 puffs_newinfo_setvtype(struct puffs_newinfo *pni, enum vtype vt)
 184 {
 185
 186         *pni->pni_vtype = vt;
 187 }
 188
 189 void
 190 puffs_newinfo_setsize(struct puffs_newinfo *pni, voff_t size)
 191 {
 192
 193         *pni->pni_size = size;
 194 }
 195
 196 void
 197 puffs_newinfo_setrdev(struct puffs_newinfo *pni, dev_t rdev)
 198 {
 199
 200         *pni->pni_rdev = rdev;
 201 }
 202
 203 void
 204 puffs_newinfo_setva(struct puffs_newinfo *pni, struct vattr *va)
 205 {
 206
 207         (void)memcpy(pni->pni_va, va, sizeof(struct vattr));
 208 }
 209
 210 void
 211 puffs_newinfo_setvattl(struct puffs_newinfo *pni, struct timespec *va_ttl)
 212 {
 213
 214         pni->pni_va_ttl->tv_sec = va_ttl->tv_sec;
 215         pni->pni_va_ttl->tv_nsec = va_ttl->tv_nsec;
 216 }
 217
 218 void
 219 puffs_newinfo_setcnttl(struct puffs_newinfo *pni, struct timespec *cn_ttl)
 220 {
 221
 222         pni->pni_cn_ttl->tv_sec = cn_ttl->tv_sec;
 223         pni->pni_cn_ttl->tv_nsec = cn_ttl->tv_nsec;
 224 }
 225