8cfc8ddc99
Like zlib compression in pstore, this patch added lzo and lz4 compression support so that users can have more options and better compression ratio. The original code treats the compressed data together with the uncompressed ECC correction notice by using zlib decompress. The ECC correction notice is missing in the decompression process. The treatment also makes lzo and lz4 not working. So I treat them separately by using pstore_decompress() to treat the compressed data, and memcpy() to treat the uncompressed ECC correction notice. Signed-off-by: Geliang Tang <geliangtang@163.com> Signed-off-by: Kees Cook <keescook@chromium.org>
84 lines
2.6 KiB
C
84 lines
2.6 KiB
C
/*
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* Persistent Storage - pstore.h
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*
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* Copyright (C) 2010 Intel Corporation <tony.luck@intel.com>
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*
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* This code is the generic layer to export data records from platform
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* level persistent storage via a file system.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _LINUX_PSTORE_H
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#define _LINUX_PSTORE_H
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#include <linux/time.h>
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#include <linux/kmsg_dump.h>
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#include <linux/mutex.h>
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#include <linux/types.h>
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#include <linux/spinlock.h>
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#include <linux/errno.h>
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/* types */
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enum pstore_type_id {
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PSTORE_TYPE_DMESG = 0,
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PSTORE_TYPE_MCE = 1,
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PSTORE_TYPE_CONSOLE = 2,
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PSTORE_TYPE_FTRACE = 3,
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/* PPC64 partition types */
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PSTORE_TYPE_PPC_RTAS = 4,
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PSTORE_TYPE_PPC_OF = 5,
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PSTORE_TYPE_PPC_COMMON = 6,
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PSTORE_TYPE_PMSG = 7,
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PSTORE_TYPE_PPC_OPAL = 8,
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PSTORE_TYPE_UNKNOWN = 255
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};
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struct module;
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struct pstore_info {
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struct module *owner;
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char *name;
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spinlock_t buf_lock; /* serialize access to 'buf' */
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char *buf;
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size_t bufsize;
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struct mutex read_mutex; /* serialize open/read/close */
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int flags;
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int (*open)(struct pstore_info *psi);
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int (*close)(struct pstore_info *psi);
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ssize_t (*read)(u64 *id, enum pstore_type_id *type,
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int *count, struct timespec *time, char **buf,
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bool *compressed, ssize_t *ecc_notice_size,
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struct pstore_info *psi);
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int (*write)(enum pstore_type_id type,
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enum kmsg_dump_reason reason, u64 *id,
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unsigned int part, int count, bool compressed,
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size_t size, struct pstore_info *psi);
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int (*write_buf)(enum pstore_type_id type,
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enum kmsg_dump_reason reason, u64 *id,
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unsigned int part, const char *buf, bool compressed,
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size_t size, struct pstore_info *psi);
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int (*erase)(enum pstore_type_id type, u64 id,
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int count, struct timespec time,
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struct pstore_info *psi);
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void *data;
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};
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#define PSTORE_FLAGS_FRAGILE 1
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extern int pstore_register(struct pstore_info *);
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extern void pstore_unregister(struct pstore_info *);
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extern bool pstore_cannot_block_path(enum kmsg_dump_reason reason);
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#endif /*_LINUX_PSTORE_H*/
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