vnode.c (2107B)
1 /* $Id: //depot/blt/srv/vfs/vnode.c#4 $ 2 ** 3 ** Copyright 1999 Sidney Cammeresi 4 ** 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 ** 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 <stdio.h> 30 #include <stdlib.h> 31 #include "vfs-int.h" 32 33 struct vnode *vget (struct superblock *super, int vnid) 34 { 35 struct vnode *v; 36 37 #ifdef VNODE_DEBUG 38 printf ("vfs: vget %d\n", vnid); 39 #endif 40 v = malloc (sizeof (struct vnode)); 41 v->v_vnid = vnid; 42 v->v_refcount = 1; 43 v->v_sb = super; 44 #ifndef VFS_SANDBOX 45 v->v_lock = qsem_create (1); 46 #endif 47 super->sb_vops->read_vnode (v); 48 return v; 49 } 50 51 void vput (struct vnode *vnode) 52 { 53 vnode->v_sb->sb_vops->drop_vnode (vnode); 54 #ifndef VFS_SANDBOX 55 qsem_destroy (vnode->v_lock); 56 #endif 57 vnode->v_refcount--; 58 if (!vnode->v_refcount) 59 free (vnode); 60 } 61