modules/spl/spl-kobj.c

   1 /*
   2  *  This file is part of the SPL: Solaris Porting Layer.
   3  *
   4  *  Copyright (c) 2008 Lawrence Livermore National Security, LLC.
   5  *  Produced at Lawrence Livermore National Laboratory
   6  *  Written by:
   7  *          Brian Behlendorf <behlendorf1@llnl.gov>,
   8  *          Herb Wartens <wartens2@llnl.gov>,
   9  *          Jim Garlick <garlick@llnl.gov>
  10  *  UCRL-CODE-235197
  11  *
  12  *  This is free software; you can redistribute it and/or modify it
  13  *  under the terms of the GNU General Public License as published by
  14  *  the Free Software Foundation; either version 2 of the License, or
  15  *  (at your option) any later version.
  16  *
  17  *  This is distributed in the hope that it will be useful, but WITHOUT
  18  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  19  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  20  *  for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License along
  23  *  with this program; if not, write to the Free Software Foundation, Inc.,
  24  *  51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA.
  25  */
  26
  27 #include <sys/kobj.h>
  28
  29 #ifdef DEBUG_SUBSYSTEM
  30 #undef DEBUG_SUBSYSTEM
  31 #endif
  32
  33 #define DEBUG_SUBSYSTEM S_KOBJ
  34
  35 struct _buf *
  36 kobj_open_file(const char *name)
  37 {
  38         struct _buf *file;
  39         vnode_t *vp;
  40         int rc;
  41         ENTRY;
  42
  43         file = kmalloc(sizeof(_buf_t), GFP_KERNEL);
  44         if (file == NULL)
  45                 RETURN((_buf_t *)-1UL);
  46
  47         if ((rc = vn_open(name, UIO_SYSSPACE, FREAD, 0644, &vp, 0, 0))) {
  48                 kfree(file);
  49                 RETURN((_buf_t *)-1UL);
  50         }
  51
  52         file->vp = vp;
  53
  54         RETURN(file);
  55 } /* kobj_open_file() */
  56 EXPORT_SYMBOL(kobj_open_file);
  57
  58 void
  59 kobj_close_file(struct _buf *file)
  60 {
  61         ENTRY;
  62         VOP_CLOSE(file->vp, 0, 0, 0, 0, 0);
  63         VN_RELE(file->vp);
  64         kfree(file);
  65         EXIT;
  66 } /* kobj_close_file() */
  67 EXPORT_SYMBOL(kobj_close_file);
  68
  69 int
  70 kobj_read_file(struct _buf *file, char *buf, ssize_t size, offset_t off)
  71 {
  72         ENTRY;
  73         RETURN(vn_rdwr(UIO_READ, file->vp, buf, size, off,
  74                UIO_SYSSPACE, 0, RLIM64_INFINITY, 0, NULL));
  75 } /* kobj_read_file() */
  76 EXPORT_SYMBOL(kobj_read_file);
  77
  78 int
  79 kobj_get_filesize(struct _buf *file, uint64_t *size)
  80 {
  81         vattr_t vap;
  82         int rc;
  83         ENTRY;
  84
  85         rc = VOP_GETATTR(file->vp, &vap, 0, 0, NULL);
  86         if (rc)
  87                 RETURN(rc);
  88
  89         *size = vap.va_size;
  90
  91         RETURN(rc);
  92 } /* kobj_get_filesize() */
  93 EXPORT_SYMBOL(kobj_get_filesize);