LXR linux/include/linux/pstore.h

   1/*
   2 * Persistent Storage - pstore.h
   3 *
   4 * Copyright (C) 2010 Intel Corporation <tony.luck@intel.com>
   5 *
   6 * This code is the generic layer to export data records from platform
   7 * level persistent storage via a file system.
   8 *
   9 *  This program is free software; you can redistribute it and/or modify
  10 *  it under the terms of the GNU General Public License version 2 as
  11 *  published by the Free Software Foundation.
  12 *
  13 *  This program is distributed in the hope that it will be useful,
  14 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 *  GNU General Public License for more details.
  17 *
  18 *  You should have received a copy of the GNU General Public License
  19 *  along with this program; if not, write to the Free Software
  20 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21 */
  22#ifndef _LINUX_PSTORE_H
  23#define _LINUX_PSTORE_H
  24
  25/* types */
  26enum pstore_type_id {
  27        PSTORE_TYPE_DMESG       = 0,
  28        PSTORE_TYPE_MCE         = 1,
  29        PSTORE_TYPE_UNKNOWN     = 255
  30};
  31
  32struct pstore_info {
  33        struct module   *owner;
  34        char            *name;
  35        spinlock_t      buf_lock;       /* serialize access to 'buf' */
  36        char            *buf;
  37        size_t          bufsize;
  38        struct mutex    read_mutex;     /* serialize open/read/close */
  39        int             (*open)(struct pstore_info *psi);
  40        int             (*close)(struct pstore_info *psi);
  41        ssize_t         (*read)(u64 *id, enum pstore_type_id *type,
  42                        struct timespec *time, char **buf,
  43                        struct pstore_info *psi);
  44        int             (*write)(enum pstore_type_id type, u64 *id,
  45                        unsigned int part, size_t size, struct pstore_info *psi);
  46        int             (*erase)(enum pstore_type_id type, u64 id,
  47                        struct pstore_info *psi);
  48        void            *data;
  49};
  50
  51#ifdef CONFIG_PSTORE
  52extern int pstore_register(struct pstore_info *);
  53extern int pstore_write(enum pstore_type_id type, char *buf, size_t size);
  54#else
  55static inline int
  56pstore_register(struct pstore_info *psi)
  57{
  58        return -ENODEV;
  59}
  60static inline int
  61pstore_write(enum pstore_type_id type, char *buf, size_t size)
  62{
  63        return -ENODEV;
  64}
  65#endif
  66
  67#endif /*_LINUX_PSTORE_H*/
  68