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jlog.c
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jlog.c
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/*
* Copyright (c) 2005-2007, OmniTI Computer Consulting, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name OmniTI Computer Consulting, Inc. nor the names
* of its contributors may be used to endorse or promote products
* derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 THE COPYRIGHT
* OWNER 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.
*/
/*****************************************************************
Journaled logging... append only.
(1) find current file, or allocate a file, extendible and mark
it current.
(2) Write records to it, records include their size, so
a simple inspection can detect and incomplete trailing
record.
(3) Write append until the file reaches a certain size.
(4) Allocate a file, extensible.
(5) RESYNC INDEX on 'finished' file (see reading:3) and postpend
an offset '0' to the index.
(2) goto (1)
Reading journals...
(1) find oldest checkpoint of all subscribers, remove all older files.
(2) (file, last_read) = find_checkpoint for this subscriber
(3) RESYNC INDEX:
open record index for file, seek to the end - off_t.
this is the offset of the last noticed record in this file.
open file, seek to this point, roll forward writing the index file
_do not_ write an offset for the last record unless it is found
complete.
(4) read entries from last_read+1 -> index of record index
*/
#include <stdio.h>
#include "jlog_config.h"
#include "jlog_private.h"
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#if HAVE_DIRENT_H
#include <dirent.h>
#endif
#if HAVE_FCNTL_H
#include <fcntl.h>
#endif
#if HAVE_ERRNO_H
#include <errno.h>
#endif
#if HAVE_TIME_H
#include <time.h>
#endif
#if HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
#define BUFFERED_INDICES 1024
static jlog_file *__jlog_open_writer(jlog_ctx *ctx);
static int __jlog_close_writer(jlog_ctx *ctx);
static jlog_file *__jlog_open_reader(jlog_ctx *ctx, u_int32_t log);
static int __jlog_close_reader(jlog_ctx *ctx);
static int __jlog_close_checkpoint(jlog_ctx *ctx);
static jlog_file *__jlog_open_indexer(jlog_ctx *ctx, u_int32_t log);
static int __jlog_close_indexer(jlog_ctx *ctx);
static int __jlog_resync_index(jlog_ctx *ctx, u_int32_t log, jlog_id *last, int *c);
static jlog_file *__jlog_open_named_checkpoint(jlog_ctx *ctx, const char *cpname, int flags);
static int __jlog_mmap_reader(jlog_ctx *ctx, u_int32_t log);
static int __jlog_munmap_reader(jlog_ctx *ctx);
int jlog_snprint_logid(char *b, int n, const jlog_id *id) {
return snprintf(b, n, "%08x:%08x", id->log, id->marker);
}
int jlog_repair_datafile(jlog_ctx *ctx, u_int32_t log)
{
jlog_message_header hdr;
char *this, *next, *afternext = NULL, *mmap_end;
int i, invalid_count = 0;
struct {
off_t start, end;
} *invalid = NULL;
off_t orig_len, src, dst, len;
#define TAG_INVALID(s, e) do { \
if (invalid_count) \
invalid = realloc(invalid, (invalid_count + 1) * sizeof(*invalid)); \
else \
invalid = malloc(sizeof(*invalid)); \
invalid[invalid_count].start = s - (char *)ctx->mmap_base; \
invalid[invalid_count].end = e - (char *)ctx->mmap_base; \
invalid_count++; \
} while (0)
ctx->last_error = JLOG_ERR_SUCCESS;
/* we want the reader's open logic because this runs in the read path
* the underlying fds are always RDWR anyway */
__jlog_open_reader(ctx, log);
if (!ctx->data) {
ctx->last_error = JLOG_ERR_FILE_OPEN;
ctx->last_errno = errno;
return -1;
}
if (!jlog_file_lock(ctx->data)) {
ctx->last_error = JLOG_ERR_LOCK;
ctx->last_errno = errno;
return -1;
}
if (__jlog_mmap_reader(ctx, log) != 0)
SYS_FAIL(JLOG_ERR_FILE_READ);
orig_len = ctx->mmap_len;
mmap_end = ctx->mmap_base + ctx->mmap_len;
/* these values will cause us to fall right into the error clause and
* start searching for a valid header from offset 0 */
this = ctx->mmap_base - sizeof(hdr);
hdr.reserved = 0;
hdr.mlen = 0;
while (this + sizeof(hdr) <= mmap_end) {
next = this + sizeof(hdr) + hdr.mlen;
if (next <= (char *)ctx->mmap_base) goto error;
if (next == mmap_end) {
this = next;
break;
}
if (next + sizeof(hdr) > mmap_end) goto error;
memcpy(&hdr, next, sizeof(hdr));
if (hdr.reserved != 0) goto error;
this = next;
continue;
error:
for (next = this + sizeof(hdr); next + sizeof(hdr) <= mmap_end; next++) {
if (!next[0] && !next[1] && !next[2] && !next[3]) {
memcpy(&hdr, next, sizeof(hdr));
afternext = next + sizeof(hdr) + hdr.mlen;
if (afternext <= (char *)ctx->mmap_base) continue;
if (afternext == mmap_end) break;
if (afternext + sizeof(hdr) > mmap_end) continue;
memcpy(&hdr, afternext, sizeof(hdr));
if (hdr.reserved == 0) break;
}
}
/* correct for while loop entry condition */
if (this < (char *)ctx->mmap_base) this = ctx->mmap_base;
if (next + sizeof(hdr) > mmap_end) break;
if (next > this) TAG_INVALID(this, next);
this = afternext;
}
if (this != mmap_end) TAG_INVALID(this, mmap_end);
#undef TAG_INVALID
#define MOVE_SEGMENT do { \
char cpbuff[4096]; \
off_t chunk; \
while(len > 0) { \
chunk = len; \
if (chunk > sizeof(cpbuff)) chunk = sizeof(cpbuff); \
if (!jlog_file_pread(ctx->data, &cpbuff, chunk, src)) \
SYS_FAIL(JLOG_ERR_FILE_READ); \
if (!jlog_file_pwrite(ctx->data, &cpbuff, chunk, dst)) \
SYS_FAIL(JLOG_ERR_FILE_WRITE); \
src += chunk; \
dst += chunk; \
len -= chunk; \
} \
} while (0)
if (invalid_count > 0) {
__jlog_munmap_reader(ctx);
src = 0;
dst = invalid[0].start;
for (i = 0; i < invalid_count - 1; ) {
src = invalid[i].end;
len = invalid[++i].start - src;
MOVE_SEGMENT;
}
src = invalid[invalid_count - 1].end;
len = orig_len - src;
if (len > 0) MOVE_SEGMENT;
if (!jlog_file_truncate(ctx->data, dst))
SYS_FAIL(JLOG_ERR_FILE_WRITE);
}
#undef MOVE_SEGMENT
finish:
jlog_file_unlock(ctx->data);
if (invalid) free(invalid);
if (ctx->last_error != JLOG_ERR_SUCCESS) return -1;
return invalid_count;
}
int jlog_inspect_datafile(jlog_ctx *ctx, u_int32_t log)
{
jlog_message_header hdr;
char *this, *next, *mmap_end;
int i;
time_t timet;
struct tm tm;
char tbuff[128];
ctx->last_error = JLOG_ERR_SUCCESS;
__jlog_open_reader(ctx, log);
if (!ctx->data)
SYS_FAIL(JLOG_ERR_FILE_OPEN);
if (__jlog_mmap_reader(ctx, log) != 0)
SYS_FAIL(JLOG_ERR_FILE_READ);
mmap_end = ctx->mmap_base + ctx->mmap_len;
this = ctx->mmap_base;
i = 0;
while (this + sizeof(hdr) <= mmap_end) {
memcpy(&hdr, this, sizeof(hdr));
i++;
if (hdr.reserved != 0) {
fprintf(stderr, "Message %d at [%ld] has invalid reserved value %u\n",
i, (long int)(this - (char *)ctx->mmap_base), hdr.reserved);
return 1;
}
fprintf(stderr, "Message %d at [%ld] of (%lu+%u)", i,
(long int)(this - (char *)ctx->mmap_base), sizeof(hdr), hdr.mlen);
next = this + sizeof(hdr) + hdr.mlen;
if (next <= (char *)ctx->mmap_base) {
fprintf(stderr, " WRAPPED TO NEGATIVE OFFSET!\n");
return 1;
}
if (next > mmap_end) {
fprintf(stderr, " OFF THE END!\n");
return 1;
}
timet = hdr.tv_sec;
localtime_r(&timet, &tm);
strftime(tbuff, sizeof(tbuff), "%c", &tm);
fprintf(stderr, "\n\ttime: %s\n\tmlen: %u\n", tbuff, hdr.mlen);
this = next;
}
if (this < mmap_end) {
fprintf(stderr, "%ld bytes of junk at the end\n",
(long int)(mmap_end - this));
return 1;
}
return 0;
finish:
return -1;
}
int jlog_idx_details(jlog_ctx *ctx, u_int32_t log,
u_int32_t *marker, int *closed)
{
off_t index_len;
u_int64_t index;
__jlog_open_indexer(ctx, log);
if (!ctx->index)
SYS_FAIL(JLOG_ERR_IDX_OPEN);
if ((index_len = jlog_file_size(ctx->index)) == -1)
SYS_FAIL(JLOG_ERR_IDX_SEEK);
if (index_len % sizeof(u_int64_t))
SYS_FAIL(JLOG_ERR_IDX_CORRUPT);
if (index_len > sizeof(u_int64_t)) {
if (!jlog_file_pread(ctx->index, &index, sizeof(u_int64_t),
index_len - sizeof(u_int64_t)))
{
SYS_FAIL(JLOG_ERR_IDX_READ);
}
if (index) {
*marker = index_len / sizeof(u_int64_t);
*closed = 0;
} else {
*marker = (index_len / sizeof(u_int64_t)) - 1;
*closed = 1;
}
} else {
*marker = index_len / sizeof(u_int64_t);
*closed = 0;
}
return 0;
finish:
return -1;
}
static int __jlog_unlink_datafile(jlog_ctx *ctx, u_int32_t log) {
char file[MAXPATHLEN];
if(ctx->current_log == log) {
__jlog_close_reader(ctx);
__jlog_close_indexer(ctx);
}
STRSETDATAFILE(ctx, file, log);
#ifdef DEBUG
fprintf(stderr, "unlinking %s\n", file);
#endif
unlink(file);
strcat(file, INDEX_EXT);
#ifdef DEBUG
fprintf(stderr, "unlinking %s\n", file);
#endif
unlink(file);
return 0;
}
static int __jlog_open_metastore(jlog_ctx *ctx)
{
char file[MAXPATHLEN];
int len;
#ifdef DEBUG
fprintf(stderr, "__jlog_open_metastore\n");
#endif
strcpy(file, ctx->path);
len = strlen(ctx->path);
file[len++] = IFS_CH;
strcpy(&file[len], "metastore");
ctx->metastore = jlog_file_open(file, O_CREAT, ctx->file_mode);
if (!ctx->metastore) {
ctx->last_errno = errno;
ctx->last_error = JLOG_ERR_CREATE_META;
return -1;
}
return 0;
}
/* exported */
int __jlog_pending_readers(jlog_ctx *ctx, u_int32_t log) {
int readers;
DIR *dir;
struct dirent *ent;
char file[MAXPATHLEN];
int len;
jlog_id id;
readers = 0;
dir = opendir(ctx->path);
if (!dir) return -1;
strcpy(file, ctx->path);
len = strlen(ctx->path);
file[len++] = IFS_CH;
file[len] = '\0';
while ((ent = readdir(dir))) {
if (ent->d_name[0] == 'c' && ent->d_name[1] == 'p' && ent->d_name[2] == '.') {
jlog_file *cp;
strcpy(file + len, ent->d_name);
#ifdef DEBUG
fprintf(stderr, "Checking if %s needs %s...\n", ent->d_name, ctx->path);
#endif
if ((cp = jlog_file_open(file, 0, ctx->file_mode))) {
if (jlog_file_lock(cp)) {
jlog_file_pread(cp, &id, sizeof(id), 0);
#ifdef DEBUG
fprintf(stderr, "\t%u <= %u (pending reader)\n", id.log, log);
#endif
if (id.log <= log) {
readers++;
}
jlog_file_unlock(cp);
}
jlog_file_close(cp);
}
}
}
closedir(dir);
return readers;
}
struct _jlog_subs {
char **subs;
int used;
int allocd;
};
int jlog_ctx_list_subscribers_dispose(jlog_ctx *ctx, char **subs) {
char *s;
int i = 0;
if(subs) {
while((s = subs[i++]) != NULL) free(s);
free(subs);
}
return 0;
}
int jlog_ctx_list_subscribers(jlog_ctx *ctx, char ***subs) {
struct _jlog_subs js = { NULL, 0, 0 };
DIR *dir;
struct dirent *ent;
unsigned char file[MAXPATHLEN];
char *p;
int len;
js.subs = calloc(16, sizeof(char *));
js.allocd = 16;
dir = opendir(ctx->path);
if (!dir) return -1;
while ((ent = readdir(dir))) {
if (ent->d_name[0] == 'c' && ent->d_name[1] == 'p' && ent->d_name[2] == '.') {
for (len = 0, p = ent->d_name + 3; *p;) {
unsigned char c;
int i;
for (c = 0, i = 0; i < 16; i++) {
if (__jlog_hexchars[i] == *p) {
c = i << 4;
break;
}
}
p++;
for (i = 0; i < 16; i++) {
if (__jlog_hexchars[i] == *p) {
c |= i;
break;
}
}
p++;
file[len++] = c;
}
file[len] = '\0';
js.subs[js.used++] = strdup((char *)file);
if(js.used == js.allocd) {
js.allocd *= 2;
js.subs = realloc(js.subs, js.allocd*sizeof(char *));
}
js.subs[js.used] = NULL;
}
}
closedir(dir);
*subs = js.subs;
return js.used;
}
static int __jlog_save_metastore(jlog_ctx *ctx, int ilocked)
{
struct _jlog_meta_info info;
#ifdef DEBUG
fprintf(stderr, "__jlog_save_metastore\n");
#endif
if (!ilocked && !jlog_file_lock(ctx->metastore)) {
return -1;
}
info.storage_log = ctx->storage.log;
info.unit_limit = ctx->unit_limit;
info.safety = ctx->safety;
if (!jlog_file_pwrite(ctx->metastore, &info, sizeof(info), 0)) {
if (!ilocked) jlog_file_unlock(ctx->metastore);
return -1;
}
if (ctx->safety == JLOG_SAFE) {
jlog_file_sync(ctx->metastore);
}
if (!ilocked) jlog_file_unlock(ctx->metastore);
return 0;
}
static int __jlog_restore_metastore(jlog_ctx *ctx, int ilocked)
{
struct _jlog_meta_info info;
#ifdef DEBUG
fprintf(stderr, "__jlog_restore_metastore\n");
#endif
if (!ilocked && !jlog_file_lock(ctx->metastore)) {
return -1;
}
if (!jlog_file_pread(ctx->metastore, &info, sizeof(info), 0)) {
if (!ilocked) jlog_file_unlock(ctx->metastore);
return -1;
}
if (!ilocked) jlog_file_unlock(ctx->metastore);
ctx->storage.log = info.storage_log;
ctx->unit_limit = info.unit_limit;
ctx->safety = info.safety;
return 0;
}
int jlog_get_checkpoint(jlog_ctx *ctx, const char *s, jlog_id *id) {
jlog_file *f;
int rv = -1;
if(ctx->subscriber_name && !strcmp(ctx->subscriber_name, s)) {
if(!ctx->checkpoint) {
ctx->checkpoint = __jlog_open_named_checkpoint(ctx, s, 0);
}
f = ctx->checkpoint;
} else
f = __jlog_open_named_checkpoint(ctx, s, 0);
if (f) {
if (jlog_file_lock(f)) {
if (jlog_file_pread(f, id, sizeof(*id), 0)) rv = 0;
jlog_file_unlock(f);
}
}
if (f && f != ctx->checkpoint) jlog_file_close(f);
return rv;
}
static int __jlog_set_checkpoint(jlog_ctx *ctx, const char *s, const jlog_id *id)
{
jlog_file *f;
int rv = -1;
jlog_id old_id;
u_int32_t log;
if(ctx->subscriber_name && !strcmp(ctx->subscriber_name, s)) {
if(!ctx->checkpoint) {
ctx->checkpoint = __jlog_open_named_checkpoint(ctx, s, 0);
}
f = ctx->checkpoint;
} else
f = __jlog_open_named_checkpoint(ctx, s, 0);
if(!f) return -1;
if (!jlog_file_lock(f))
goto failset;
if (jlog_file_size(f) == 0) {
/* we're setting it for the first time, no segments were pending on it */
old_id.log = id->log;
} else {
if (!jlog_file_pread(f, &old_id, sizeof(old_id), 0))
goto failset;
}
if (!jlog_file_pwrite(f, id, sizeof(*id), 0))
goto failset;
if (ctx->safety == JLOG_SAFE) {
jlog_file_sync(f);
}
jlog_file_unlock(f);
rv = 0;
for (log = old_id.log; log < id->log; log++) {
if (__jlog_pending_readers(ctx, log) == 0) {
__jlog_unlink_datafile(ctx, log);
}
}
failset:
if (f && f != ctx->checkpoint) jlog_file_close(f);
return rv;
}
static int __jlog_close_metastore(jlog_ctx *ctx) {
if (ctx->metastore) {
jlog_file_close(ctx->metastore);
ctx->metastore = NULL;
}
return 0;
}
/* path is assumed to be MAXPATHLEN */
static char *compute_checkpoint_filename(jlog_ctx *ctx, const char *subscriber, char *name)
{
const char *sub;
int len;
/* build checkpoint filename */
len = strlen(ctx->path);
strcpy(name, ctx->path);
name[len++] = IFS_CH;
name[len++] = 'c';
name[len++] = 'p';
name[len++] = '.';
for (sub = subscriber; *sub; ) {
name[len++] = __jlog_hexchars[((*sub & 0xf0) >> 4)];
name[len++] = __jlog_hexchars[(*sub & 0x0f)];
sub++;
}
name[len++] = '\0';
#ifdef DEBUG
fprintf(stderr, "checkpoint %s filename is %s\n", subscriber, name);
#endif
return name;
}
static jlog_file *__jlog_open_named_checkpoint(jlog_ctx *ctx, const char *cpname, int flags)
{
char name[MAXPATHLEN];
compute_checkpoint_filename(ctx, cpname, name);
return jlog_file_open(name, flags, ctx->file_mode);
}
static jlog_file *__jlog_open_reader(jlog_ctx *ctx, u_int32_t log) {
char file[MAXPATHLEN];
if(ctx->current_log != log) {
__jlog_close_reader(ctx);
__jlog_close_indexer(ctx);
}
if(ctx->data) {
return ctx->data;
}
STRSETDATAFILE(ctx, file, log);
#ifdef DEBUG
fprintf(stderr, "opening log file[ro]: '%s'\n", file);
#endif
ctx->data = jlog_file_open(file, 0, ctx->file_mode);
ctx->current_log = log;
return ctx->data;
}
static int __jlog_munmap_reader(jlog_ctx *ctx) {
if(ctx->mmap_base) {
munmap(ctx->mmap_base, ctx->mmap_len);
ctx->mmap_base = NULL;
ctx->mmap_len = 0;
}
return 0;
}
static int __jlog_mmap_reader(jlog_ctx *ctx, u_int32_t log) {
if(ctx->current_log == log && ctx->mmap_base) return 0;
__jlog_open_reader(ctx, log);
if(!ctx->data)
return -1;
if (!jlog_file_map_read(ctx->data, &ctx->mmap_base, &ctx->mmap_len)) {
ctx->mmap_base = NULL;
ctx->last_error = JLOG_ERR_FILE_READ;
ctx->last_errno = errno;
return -1;
}
return 0;
}
static jlog_file *__jlog_open_writer(jlog_ctx *ctx) {
char file[MAXPATHLEN];
if(ctx->data) {
/* Still open */
return ctx->data;
}
if(!jlog_file_lock(ctx->metastore))
SYS_FAIL(JLOG_ERR_LOCK);
if(__jlog_restore_metastore(ctx, 1))
SYS_FAIL(JLOG_ERR_META_OPEN);
STRSETDATAFILE(ctx, file, ctx->storage.log);
#ifdef DEBUG
fprintf(stderr, "opening log file[rw]: '%s'\n", file);
#endif
ctx->data = jlog_file_open(file, O_CREAT, ctx->file_mode);
finish:
jlog_file_unlock(ctx->metastore);
return ctx->data;
}
static int __jlog_close_writer(jlog_ctx *ctx) {
if (ctx->data) {
jlog_file_close(ctx->data);
ctx->data = NULL;
}
return 0;
}
static int __jlog_close_reader(jlog_ctx *ctx) {
__jlog_munmap_reader(ctx);
if (ctx->data) {
jlog_file_close(ctx->data);
ctx->data = NULL;
}
return 0;
}
static int __jlog_close_checkpoint(jlog_ctx *ctx) {
if (ctx->checkpoint) {
jlog_file_close(ctx->checkpoint);
ctx->checkpoint = NULL;
}
return 0;
}
static jlog_file *__jlog_open_indexer(jlog_ctx *ctx, u_int32_t log) {
char file[MAXPATHLEN];
if(ctx->current_log != log) {
__jlog_close_reader(ctx);
__jlog_close_indexer(ctx);
}
if(ctx->index) {
return ctx->index;
}
STRSETDATAFILE(ctx, file, log);
strcat(file, INDEX_EXT);
#ifdef DEBUG
fprintf(stderr, "opening index file: '%s'\n", idx);
#endif
ctx->index = jlog_file_open(file, O_CREAT, ctx->file_mode);
ctx->current_log = log;
return ctx->index;
}
static int __jlog_close_indexer(jlog_ctx *ctx) {
if (ctx->index) {
jlog_file_close(ctx->index);
ctx->index = NULL;
}
return 0;
}
static int
___jlog_resync_index(jlog_ctx *ctx, u_int32_t log, jlog_id *last,
int *closed) {
jlog_message_header logmhdr;
int i, second_try = 0;
off_t index_off, data_off, data_len;
u_int64_t index;
u_int64_t indices[BUFFERED_INDICES];
ctx->last_error = JLOG_ERR_SUCCESS;
if(closed) *closed = 0;
__jlog_open_reader(ctx, log);
if (!ctx->data) {
ctx->last_error = JLOG_ERR_FILE_OPEN;
ctx->last_errno = errno;
return -1;
}
#define RESTART do { \
if (second_try == 0) { \
jlog_file_truncate(ctx->index, 0); \
jlog_file_unlock(ctx->index); \
second_try = 1; \
ctx->last_error = JLOG_ERR_SUCCESS; \
goto restart; \
} \
SYS_FAIL(JLOG_ERR_IDX_CORRUPT); \
} while (0)
restart:
__jlog_open_indexer(ctx, log);
if (!ctx->index) {
ctx->last_error = JLOG_ERR_IDX_OPEN;
ctx->last_errno = errno;
return -1;
}
if (!jlog_file_lock(ctx->index)) {
ctx->last_error = JLOG_ERR_LOCK;
ctx->last_errno = errno;
return -1;
}
data_off = 0;
if ((data_len = jlog_file_size(ctx->data)) == -1)
SYS_FAIL(JLOG_ERR_FILE_SEEK);
if ((index_off = jlog_file_size(ctx->index)) == -1)
SYS_FAIL(JLOG_ERR_IDX_SEEK);
if (index_off % sizeof(u_int64_t)) {
#ifdef DEBUG
fprintf(stderr, "corrupt index [%llu]\n", index_off);
#endif
RESTART;
}
if (index_off > sizeof(u_int64_t)) {
if (!jlog_file_pread(ctx->index, &index, sizeof(index),
index_off - sizeof(u_int64_t)))
{
SYS_FAIL(JLOG_ERR_IDX_READ);
}
if (index == 0) {
/* This log file has been "closed" */
#ifdef DEBUG
fprintf(stderr, "index closed\n");
#endif
if(last) {
last->log = log;
last->marker = (index_off / sizeof(u_int64_t)) - 1;
}
if(closed) *closed = 1;
goto finish;
} else {
if (index > data_len) {
#ifdef DEBUG
fprintf(stderr, "index told me to seek somehwere I can't\n");
#endif
RESTART;
}
data_off = index;
}
}
if (index_off > 0) {
/* We are adding onto a partial index so we must advance a record */
if (!jlog_file_pread(ctx->data, &logmhdr, sizeof(logmhdr), data_off))
SYS_FAIL(JLOG_ERR_FILE_READ);
if ((data_off += sizeof(logmhdr) + logmhdr.mlen) > data_len)
RESTART;
}
i = 0;
while (data_off + sizeof(logmhdr) <= data_len) {
off_t next_off = data_off;
if (!jlog_file_pread(ctx->data, &logmhdr, sizeof(logmhdr), data_off))
SYS_FAIL(JLOG_ERR_FILE_READ);
if ((next_off += sizeof(logmhdr) + logmhdr.mlen) > data_len)
break;
/* Write our new index offset */
indices[i++] = data_off;
if(i >= BUFFERED_INDICES) {
#ifdef DEBUG
fprintf(stderr, "writing %i offsets\n", i);
#endif
if (!jlog_file_pwrite(ctx->index, indices, i * sizeof(u_int64_t), index_off))
RESTART;
index_off += i * sizeof(u_int64_t);
i = 0;
}
data_off = next_off;
}
if(i > 0) {
#ifdef DEBUG
fprintf(stderr, "writing %i offsets\n", i);
#endif
if (!jlog_file_pwrite(ctx->index, indices, i * sizeof(u_int64_t), index_off))
RESTART;
index_off += i * sizeof(u_int64_t);
}
if(last) {
last->log = log;
last->marker = index_off / sizeof(u_int64_t);
}
if(log < ctx->storage.log) {
if (data_off != data_len) {
#ifdef DEBUG
fprintf(stderr, "closing index, but %llu != %llu\n", data_off, data_len);
#endif
SYS_FAIL(JLOG_ERR_FILE_CORRUPT);
}
/* Special case: if we are closing, we next write a '0'
* we can't write the closing marker if the data segment had no records
* in it, since it will be confused with an index to offset 0 by the
* next reader; this only happens when segments are repaired */
if (index_off) {
index = 0;
if (!jlog_file_pwrite(ctx->index, &index, sizeof(u_int64_t), index_off))
RESTART;
}
if(closed) *closed = 1;
}
#undef RESTART
finish:
jlog_file_unlock(ctx->index);
#ifdef DEBUG
fprintf(stderr, "index is %s\n", closed?(*closed?"closed":"open"):"unknown");
#endif
if(ctx->last_error == JLOG_ERR_SUCCESS) return 0;
return -1;
}
static int __jlog_resync_index(jlog_ctx *ctx, u_int32_t log, jlog_id *last, int *closed) {
int attempts, rv = -1;
for(attempts=0; attempts<4; attempts++) {
rv = ___jlog_resync_index(ctx, log, last, closed);
if(ctx->last_error == JLOG_ERR_SUCCESS) break;
if(ctx->last_error == JLOG_ERR_FILE_OPEN ||
ctx->last_error == JLOG_ERR_IDX_OPEN) break;
/* We can't fix the file if someone may write to it again */
if(log >= ctx->storage.log) break;
jlog_file_lock(ctx->index);
/* it doesn't really matter what jlog_repair_datafile returns
* we'll keep retrying anyway */
jlog_repair_datafile(ctx, log);
jlog_file_truncate(ctx->index, 0);
jlog_file_unlock(ctx->index);
}
return rv;
}
jlog_ctx *jlog_new(const char *path) {
jlog_ctx *ctx;
ctx = calloc(1, sizeof(*ctx));
ctx->unit_limit = DEFAULT_UNIT_LIMIT;
ctx->file_mode = DEFAULT_FILE_MODE;
ctx->safety = DEFAULT_SAFETY;
ctx->context_mode = JLOG_NEW;
ctx->path = strdup(path);
return ctx;
}
void jlog_set_error_func(jlog_ctx *ctx, jlog_error_func Func, void *ptr) {
ctx->error_func = Func;
ctx->error_ctx = ptr;
}
size_t jlog_raw_size(jlog_ctx *ctx) {
DIR *d;
struct dirent *de;
size_t totalsize = 0;
int ferr, len;
char filename[MAXPATHLEN];
d = opendir(ctx->path);
if(!d) return 0;
len = strlen(ctx->path);
memcpy(filename, ctx->path, len);
filename[len++] = IFS_CH;
while((de = readdir(d)) != NULL) {
struct stat sb;
strcpy(filename+len, de->d_name);
while((ferr = stat(filename, &sb)) == -1 && errno == EINTR);
if(ferr == 0 && S_ISREG(sb.st_mode)) totalsize += sb.st_size;
}
closedir(d);
return totalsize;
}
const char *jlog_ctx_err_string(jlog_ctx *ctx) {
switch (ctx->last_error) {
#define MSG_O_MATIC(x) case x: return #x;
MSG_O_MATIC( JLOG_ERR_SUCCESS);
MSG_O_MATIC( JLOG_ERR_ILLEGAL_INIT);
MSG_O_MATIC( JLOG_ERR_ILLEGAL_OPEN);
MSG_O_MATIC( JLOG_ERR_OPEN);
MSG_O_MATIC( JLOG_ERR_NOTDIR);
MSG_O_MATIC( JLOG_ERR_CREATE_PATHLEN);
MSG_O_MATIC( JLOG_ERR_CREATE_EXISTS);
MSG_O_MATIC( JLOG_ERR_CREATE_MKDIR);
MSG_O_MATIC( JLOG_ERR_CREATE_META);
MSG_O_MATIC( JLOG_ERR_LOCK);
MSG_O_MATIC( JLOG_ERR_IDX_OPEN);
MSG_O_MATIC( JLOG_ERR_IDX_SEEK);
MSG_O_MATIC( JLOG_ERR_IDX_CORRUPT);
MSG_O_MATIC( JLOG_ERR_IDX_WRITE);
MSG_O_MATIC( JLOG_ERR_IDX_READ);
MSG_O_MATIC( JLOG_ERR_FILE_OPEN);
MSG_O_MATIC( JLOG_ERR_FILE_SEEK);
MSG_O_MATIC( JLOG_ERR_FILE_CORRUPT);
MSG_O_MATIC( JLOG_ERR_FILE_READ);
MSG_O_MATIC( JLOG_ERR_FILE_WRITE);