module/spl/spl-kobj.c

   1 /*****************************************************************************\
   2  *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
   3  *  Copyright (C) 2007 The Regents of the University of California.
   4  *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
   5  *  Written by Brian Behlendorf <behlendorf1@llnl.gov>.
   6  *  UCRL-CODE-235197
   7  *
   8  *  This file is part of the SPL, Solaris Porting Layer.
   9  *  For details, see <http://zfsonlinux.org/>.
  10  *
  11  *  The SPL is free software; you can redistribute it and/or modify it
  12  *  under the terms of the GNU General Public License as published by the
  13  *  Free Software Foundation; either version 2 of the License, or (at your
  14  *  option) any later version.
  15  *
  16  *  The SPL is distributed in the hope that it will be useful, but WITHOUT
  17  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  18  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  19  *  for more details.
  20  *
  21  *  You should have received a copy of the GNU General Public License along
  22  *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
  23  *****************************************************************************
  24  *  Solaris Porting Layer (SPL) Kobj Implementation.
  25 \*****************************************************************************/
  26
  27 #include <sys/kobj.h>
  28
  29 struct _buf *
  30 kobj_open_file(const char *name)
  31 {
  32         struct _buf *file;
  33         vnode_t *vp;
  34         int rc;
  35
  36         file = kmalloc(sizeof(_buf_t), kmem_flags_convert(KM_SLEEP));
  37         if (file == NULL)
  38                 return ((_buf_t *)-1UL);
  39
  40         if ((rc = vn_open(name, UIO_SYSSPACE, FREAD, 0644, &vp, 0, 0))) {
  41                 kfree(file);
  42                 return ((_buf_t *)-1UL);
  43         }
  44
  45         file->vp = vp;
  46
  47         return (file);
  48 } /* kobj_open_file() */
  49 EXPORT_SYMBOL(kobj_open_file);
  50
  51 void
  52 kobj_close_file(struct _buf *file)
  53 {
  54         VOP_CLOSE(file->vp, 0, 0, 0, 0, 0);
  55         kfree(file);
  56 } /* kobj_close_file() */
  57 EXPORT_SYMBOL(kobj_close_file);
  58
  59 int
  60 kobj_read_file(struct _buf *file, char *buf, unsigned size, unsigned off)
  61 {
  62         ssize_t resid;
  63
  64         if (vn_rdwr(UIO_READ, file->vp, buf, size, (offset_t)off,
  65             UIO_SYSSPACE, 0, 0, 0, &resid) != 0)
  66                 return (-1);
  67
  68         return (size - resid);
  69 } /* kobj_read_file() */
  70 EXPORT_SYMBOL(kobj_read_file);
  71
  72 int
  73 kobj_get_filesize(struct _buf *file, uint64_t *size)
  74 {
  75         vattr_t vap;
  76         int rc;
  77
  78         rc = VOP_GETATTR(file->vp, &vap, 0, 0, NULL);
  79         if (rc)
  80                 return (rc);
  81
  82         *size = vap.va_size;
  83
  84         return (rc);
  85 } /* kobj_get_filesize() */
  86 EXPORT_SYMBOL(kobj_get_filesize);