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#ifndef TARANTOOL_LOG_IO_H_INCLUDED
#define TARANTOOL_LOG_IO_H_INCLUDED
/*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* 1. Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY <COPYRIGHT HOLDER> ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* <COPYRIGHT HOLDER> OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <stdio.h>
#include <limits.h>
#include <stdbool.h>
#include "tarantool/util.h"
#include "tarantool_ev.h"
extern const uint32_t default_version;
enum log_format { XLOG = 65534, SNAP = 65535 };
enum log_mode {
LOG_READ,
LOG_WRITE
};
enum log_suffix { NONE, INPROGRESS };
struct log_dir {
bool panic_if_error;
/**
* true if the file can by fsync()ed at close
* in a separate thread.
*/
bool sync_is_async;
/* Additional flags to apply at fopen(2) to write. */
char open_wflags[6];
const char *filetype;
const char *filename_ext;
char *dirname;
};
extern struct log_dir snap_dir;
extern struct log_dir wal_dir;
int64_t
greatest_lsn(struct log_dir *dir);
char *
format_filename(struct log_dir *dir, int64_t lsn, enum log_suffix suffix);
int64_t
find_including_file(struct log_dir *dir, int64_t target_lsn);
struct log_io {
struct log_dir *dir;
FILE *f;
enum log_mode mode;
size_t rows;
int retry;
char filename[PATH_MAX + 1];
bool is_inprogress;
};
struct log_io *
log_io_open_for_read(struct log_dir *dir, int64_t lsn, enum log_suffix suffix);
struct log_io *
log_io_open_for_write(struct log_dir *dir, int64_t lsn, enum log_suffix suffix);
struct log_io *
log_io_open(struct log_dir *dir, enum log_mode mode,
const char *filename, enum log_suffix suffix, FILE *file);
int
log_io_sync(struct log_io *l);
int
log_io_close(struct log_io **lptr);
void
log_io_atfork(struct log_io **lptr);
struct log_io_cursor
{
struct log_io *log;
int row_count;
off_t good_offset;
bool eof_read;
};
void
log_io_cursor_open(struct log_io_cursor *i, struct log_io *l);
void
log_io_cursor_close(struct log_io_cursor *i);
const char *
log_io_cursor_next(struct log_io_cursor *i, uint32_t *rowlen);
typedef uint32_t log_magic_t;
struct header_v11 {
uint32_t header_crc32c;
int64_t lsn;
double tm;
uint32_t len;
uint32_t data_crc32c;
} __attribute__((packed));
static inline struct header_v11 *header_v11(const char *t)
{
return (struct header_v11 *)t;
}
static inline void
header_v11_fill(struct header_v11 *header, int64_t lsn, size_t data_len)
{
header->lsn = lsn;
header->tm = ev_now();
header->len = data_len;
}
void
header_v11_sign(struct header_v11 *header);
struct row_v11 {
log_magic_t marker;
struct header_v11 header;
uint16_t tag;
uint64_t cookie;
uint8_t data[];
} __attribute__((packed));
void
row_v11_fill(struct row_v11 *row, int64_t lsn, uint16_t tag,
uint64_t cookie, const char *metadata, size_t metadata_len,
const char *data, size_t data_len);
static inline size_t
row_v11_size(struct row_v11 *row)
{
return sizeof(row->marker) + sizeof(struct header_v11) + row->header.len;
}
int
inprogress_log_unlink(char *filename);
int
inprogress_log_rename(struct log_io *l);
#endif /* TARANTOOL_LOG_IO_H_INCLUDED */
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