usr/src/uts/common/fs/objfs/objfs_common.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #pragma ident   "%Z%%M% %I%     %E% SMI"
  27
  28 #include <sys/errno.h>
  29 #include <sys/file.h>
  30 #include <sys/objfs.h>
  31 #include <sys/objfs_impl.h>
  32
  33 /*
  34  * For directories, make sure we are using large-file aware interfaces and we
  35  * aren't trying to open it writeable.
  36  */
  37 /* ARGSUSED */
  38 int
  39 objfs_dir_open(vnode_t **cpp, int flag, cred_t *cr,
  40     caller_context_t *ct)
  41 {
  42         if ((flag & (FOFFMAX | FWRITE)) != FOFFMAX)
  43                 return (EINVAL);
  44
  45         return (0);
  46 }
  47
  48 /*
  49  * For all vnodes which have no cleanup to do at close time.
  50  */
  51 /* ARGSUSED */
  52 int
  53 objfs_common_close(vnode_t *vp, int flag, int count, offset_t off, cred_t *cr,
  54     caller_context_t *ct)
  55 {
  56         return (0);
  57 }
  58
  59 /*
  60  * For directories, ensure we're not open for writing.
  61  */
  62 /* ARGSUSED */
  63 int
  64 objfs_dir_access(vnode_t *vp, int mode, int flags, cred_t *cr,
  65     caller_context_t *ct)
  66 {
  67         if (mode & VWRITE)
  68                 return (EACCES);
  69
  70         return (0);
  71 }
  72
  73 /*
  74  * Fills in common fields for getattr().
  75  */
  76 int
  77 objfs_common_getattr(vnode_t *vp, vattr_t *vap)
  78 {
  79         vap->va_uid = 0;
  80         vap->va_gid = 0;
  81         vap->va_rdev = 0;
  82         vap->va_blksize = DEV_BSIZE;
  83         vap->va_nblocks = howmany(vap->va_size, vap->va_blksize);
  84         vap->va_seq = 0;
  85         vap->va_fsid = vp->v_vfsp->vfs_dev;
  86
  87         return (0);
  88 }
  89
  90 /*
  91  * Returns the number objects currently loaded in the system.
  92  */
  93 int
  94 objfs_nobjs(void)
  95 {
  96         int count = 0;
  97         struct modctl *mp;
  98
  99         mutex_enter(&mod_lock);
 100         mp = &modules;
 101
 102         do {
 103                 if (mp->mod_loaded)
 104                         count++;
 105         } while ((mp = mp->mod_next) != &modules);
 106
 107         mutex_exit(&mod_lock);
 108
 109         return (count);
 110 }