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://github.com/behlendorf/spl/>.
  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 #include <spl-debug.h>
  29
  30 #ifdef SS_DEBUG_SUBSYS
  31 #undef SS_DEBUG_SUBSYS
  32 #endif
  33
  34 #define SS_DEBUG_SUBSYS SS_KOBJ
  35
  36 struct _buf *
  37 kobj_open_file(const char *name)
  38 {
  39         struct _buf *file;
  40         vnode_t *vp;
  41         int rc;
  42         SENTRY;
  43
  44         file = kmalloc(sizeof(_buf_t), GFP_KERNEL);
  45         if (file == NULL)
  46                 SRETURN((_buf_t *)-1UL);
  47
  48         if ((rc = vn_open(name, UIO_SYSSPACE, FREAD, 0644, &vp, 0, 0))) {
  49                 kfree(file);
  50                 SRETURN((_buf_t *)-1UL);
  51         }
  52
  53         file->vp = vp;
  54
  55         SRETURN(file);
  56 } /* kobj_open_file() */
  57 EXPORT_SYMBOL(kobj_open_file);
  58
  59 void
  60 kobj_close_file(struct _buf *file)
  61 {
  62         SENTRY;
  63         VOP_CLOSE(file->vp, 0, 0, 0, 0, 0);
  64         kfree(file);
  65         SEXIT;
  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         SENTRY;
  73         SRETURN(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         SENTRY;
  84
  85         rc = VOP_GETATTR(file->vp, &vap, 0, 0, NULL);
  86         if (rc)
  87                 SRETURN(rc);
  88
  89         *size = vap.va_size;
  90
  91         SRETURN(rc);
  92 } /* kobj_get_filesize() */
  93 EXPORT_SYMBOL(kobj_get_filesize);