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#include <linux/time.h>
  26#include <linux/kmsg_dump.h>
  27#include <linux/mutex.h>
  28#include <linux/types.h>
  29#include <linux/spinlock.h>
  30#include <linux/errno.h>
  31
  32/* types */
  33enum pstore_type_id {
  34        PSTORE_TYPE_DMESG       = 0,
  35        PSTORE_TYPE_MCE         = 1,
  36        PSTORE_TYPE_CONSOLE     = 2,
  37        PSTORE_TYPE_FTRACE      = 3,
  38        /* PPC64 partition types */
  39        PSTORE_TYPE_PPC_RTAS    = 4,
  40        PSTORE_TYPE_PPC_OF      = 5,
  41        PSTORE_TYPE_PPC_COMMON  = 6,
  42        PSTORE_TYPE_UNKNOWN     = 255
  43};
  44
  45struct module;
  46
  47struct pstore_info {
  48        struct module   *owner;
  49        char            *name;
  50        spinlock_t      buf_lock;       /* serialize access to 'buf' */
  51        char            *buf;
  52        size_t          bufsize;
  53        struct mutex    read_mutex;     /* serialize open/read/close */
  54        int             flags;
  55        int             (*open)(struct pstore_info *psi);
  56        int             (*close)(struct pstore_info *psi);
  57        ssize_t         (*read)(u64 *id, enum pstore_type_id *type,
  58                        int *count, struct timespec *time, char **buf,
  59                        bool *compressed, struct pstore_info *psi);
  60        int             (*write)(enum pstore_type_id type,
  61                        enum kmsg_dump_reason reason, u64 *id,
  62                        unsigned int part, int count, bool compressed,
  63                        size_t size, struct pstore_info *psi);
  64        int             (*write_buf)(enum pstore_type_id type,
  65                        enum kmsg_dump_reason reason, u64 *id,
  66                        unsigned int part, const char *buf, bool compressed,
  67                        size_t size, struct pstore_info *psi);
  68        int             (*erase)(enum pstore_type_id type, u64 id,
  69                        int count, struct timespec time,
  70                        struct pstore_info *psi);
  71        void            *data;
  72};
  73
  74#define PSTORE_FLAGS_FRAGILE    1
  75
  76#ifdef CONFIG_PSTORE
  77extern int pstore_register(struct pstore_info *);
  78extern bool pstore_cannot_block_path(enum kmsg_dump_reason reason);
  79#else
  80static inline int
  81pstore_register(struct pstore_info *psi)
  82{
  83        return -ENODEV;
  84}
  85static inline bool
  86pstore_cannot_block_path(enum kmsg_dump_reason reason)
  87{
  88        return false;
  89}
  90#endif
  91
  92#endif /*_LINUX_PSTORE_H*/
  93