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/*
Trivial Database 2: fetch, store and misc routines.
Copyright (C) Rusty Russell 2010
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "private.h"
#ifndef _SAMBA_BUILD_
#include <ccan/asprintf/asprintf.h>
#include <stdarg.h>
#endif
static enum TDB_ERROR update_rec_hdr(struct tdb_context *tdb,
tdb_off_t off,
tdb_len_t keylen,
tdb_len_t datalen,
struct tdb_used_record *rec,
uint64_t h)
{
uint64_t dataroom = rec_data_length(rec) + rec_extra_padding(rec);
enum TDB_ERROR ecode;
ecode = set_header(tdb, rec, TDB_USED_MAGIC, keylen, datalen,
keylen + dataroom, h);
if (ecode == TDB_SUCCESS) {
ecode = tdb_write_convert(tdb, off, rec, sizeof(*rec));
}
return ecode;
}
static enum TDB_ERROR replace_data(struct tdb_context *tdb,
struct hash_info *h,
struct tdb_data key, struct tdb_data dbuf,
tdb_off_t old_off, tdb_len_t old_room,
bool growing)
{
tdb_off_t new_off;
enum TDB_ERROR ecode;
/* Allocate a new record. */
new_off = alloc(tdb, key.dsize, dbuf.dsize, h->h, TDB_USED_MAGIC,
growing);
if (TDB_OFF_IS_ERR(new_off)) {
return new_off;
}
/* We didn't like the existing one: remove it. */
if (old_off) {
tdb->stats.frees++;
ecode = add_free_record(tdb, old_off,
sizeof(struct tdb_used_record)
+ key.dsize + old_room,
TDB_LOCK_WAIT, true);
if (ecode == TDB_SUCCESS)
ecode = replace_in_hash(tdb, h, new_off);
} else {
ecode = add_to_hash(tdb, h, new_off);
}
if (ecode != TDB_SUCCESS) {
return ecode;
}
new_off += sizeof(struct tdb_used_record);
ecode = tdb->tdb2.io->twrite(tdb, new_off, key.dptr, key.dsize);
if (ecode != TDB_SUCCESS) {
return ecode;
}
new_off += key.dsize;
ecode = tdb->tdb2.io->twrite(tdb, new_off, dbuf.dptr, dbuf.dsize);
if (ecode != TDB_SUCCESS) {
return ecode;
}
if (tdb->flags & TDB_SEQNUM)
tdb_inc_seqnum(tdb);
return TDB_SUCCESS;
}
static enum TDB_ERROR update_data(struct tdb_context *tdb,
tdb_off_t off,
struct tdb_data dbuf,
tdb_len_t extra)
{
enum TDB_ERROR ecode;
ecode = tdb->tdb2.io->twrite(tdb, off, dbuf.dptr, dbuf.dsize);
if (ecode == TDB_SUCCESS && extra) {
/* Put a zero in; future versions may append other data. */
ecode = tdb->tdb2.io->twrite(tdb, off + dbuf.dsize, "", 1);
}
if (tdb->flags & TDB_SEQNUM)
tdb_inc_seqnum(tdb);
return ecode;
}
enum TDB_ERROR tdb_store(struct tdb_context *tdb,
struct tdb_data key, struct tdb_data dbuf, int flag)
{
struct hash_info h;
tdb_off_t off;
tdb_len_t old_room = 0;
struct tdb_used_record rec;
enum TDB_ERROR ecode;
if (tdb->flags & TDB_VERSION1) {
if (tdb1_store(tdb, key, dbuf, flag) == -1)
return tdb->last_error;
return TDB_SUCCESS;
}
off = find_and_lock(tdb, key, F_WRLCK, &h, &rec, NULL);
if (TDB_OFF_IS_ERR(off)) {
return tdb->last_error = off;
}
/* Now we have lock on this hash bucket. */
if (flag == TDB_INSERT) {
if (off) {
ecode = TDB_ERR_EXISTS;
goto out;
}
} else {
if (off) {
old_room = rec_data_length(&rec)
+ rec_extra_padding(&rec);
if (old_room >= dbuf.dsize) {
/* Can modify in-place. Easy! */
ecode = update_rec_hdr(tdb, off,
key.dsize, dbuf.dsize,
&rec, h.h);
if (ecode != TDB_SUCCESS) {
goto out;
}
ecode = update_data(tdb,
off + sizeof(rec)
+ key.dsize, dbuf,
old_room - dbuf.dsize);
if (ecode != TDB_SUCCESS) {
goto out;
}
tdb_unlock_hashes(tdb, h.hlock_start,
h.hlock_range, F_WRLCK);
return tdb->last_error = TDB_SUCCESS;
}
} else {
if (flag == TDB_MODIFY) {
/* if the record doesn't exist and we
are in TDB_MODIFY mode then we should fail
the store */
ecode = TDB_ERR_NOEXIST;
goto out;
}
}
}
/* If we didn't use the old record, this implies we're growing. */
ecode = replace_data(tdb, &h, key, dbuf, off, old_room, off);
out:
tdb_unlock_hashes(tdb, h.hlock_start, h.hlock_range, F_WRLCK);
return tdb->last_error = ecode;
}
enum TDB_ERROR tdb_append(struct tdb_context *tdb,
struct tdb_data key, struct tdb_data dbuf)
{
struct hash_info h;
tdb_off_t off;
struct tdb_used_record rec;
tdb_len_t old_room = 0, old_dlen;
unsigned char *newdata;
struct tdb_data new_dbuf;
enum TDB_ERROR ecode;
if (tdb->flags & TDB_VERSION1) {
if (tdb1_append(tdb, key, dbuf) == -1)
return tdb->last_error;
return TDB_SUCCESS;
}
off = find_and_lock(tdb, key, F_WRLCK, &h, &rec, NULL);
if (TDB_OFF_IS_ERR(off)) {
return tdb->last_error = off;
}
if (off) {
old_dlen = rec_data_length(&rec);
old_room = old_dlen + rec_extra_padding(&rec);
/* Fast path: can append in place. */
if (rec_extra_padding(&rec) >= dbuf.dsize) {
ecode = update_rec_hdr(tdb, off, key.dsize,
old_dlen + dbuf.dsize, &rec,
h.h);
if (ecode != TDB_SUCCESS) {
goto out;
}
off += sizeof(rec) + key.dsize + old_dlen;
ecode = update_data(tdb, off, dbuf,
rec_extra_padding(&rec));
goto out;
}
/* Slow path. */
newdata = malloc(key.dsize + old_dlen + dbuf.dsize);
if (!newdata) {
ecode = tdb_logerr(tdb, TDB_ERR_OOM, TDB_LOG_ERROR,
"tdb_append:"
" failed to allocate %zu bytes",
(size_t)(key.dsize + old_dlen
+ dbuf.dsize));
goto out;
}
ecode = tdb->tdb2.io->tread(tdb, off + sizeof(rec) + key.dsize,
newdata, old_dlen);
if (ecode != TDB_SUCCESS) {
goto out_free_newdata;
}
memcpy(newdata + old_dlen, dbuf.dptr, dbuf.dsize);
new_dbuf.dptr = newdata;
new_dbuf.dsize = old_dlen + dbuf.dsize;
} else {
newdata = NULL;
new_dbuf = dbuf;
}
/* If they're using tdb_append(), it implies they're growing record. */
ecode = replace_data(tdb, &h, key, new_dbuf, off, old_room, true);
out_free_newdata:
free(newdata);
out:
tdb_unlock_hashes(tdb, h.hlock_start, h.hlock_range, F_WRLCK);
return tdb->last_error = ecode;
}
enum TDB_ERROR tdb_fetch(struct tdb_context *tdb, struct tdb_data key,
struct tdb_data *data)
{
tdb_off_t off;
struct tdb_used_record rec;
struct hash_info h;
enum TDB_ERROR ecode;
if (tdb->flags & TDB_VERSION1)
return tdb1_fetch(tdb, key, data);
off = find_and_lock(tdb, key, F_RDLCK, &h, &rec, NULL);
if (TDB_OFF_IS_ERR(off)) {
return tdb->last_error = off;
}
if (!off) {
ecode = TDB_ERR_NOEXIST;
} else {
data->dsize = rec_data_length(&rec);
data->dptr = tdb_alloc_read(tdb, off + sizeof(rec) + key.dsize,
data->dsize);
if (TDB_PTR_IS_ERR(data->dptr)) {
ecode = TDB_PTR_ERR(data->dptr);
} else
ecode = TDB_SUCCESS;
}
tdb_unlock_hashes(tdb, h.hlock_start, h.hlock_range, F_RDLCK);
return tdb->last_error = ecode;
}
bool tdb_exists(struct tdb_context *tdb, TDB_DATA key)
{
tdb_off_t off;
struct tdb_used_record rec;
struct hash_info h;
if (tdb->flags & TDB_VERSION1) {
return tdb1_exists(tdb, key);
}
off = find_and_lock(tdb, key, F_RDLCK, &h, &rec, NULL);
if (TDB_OFF_IS_ERR(off)) {
tdb->last_error = off;
return false;
}
tdb_unlock_hashes(tdb, h.hlock_start, h.hlock_range, F_RDLCK);
tdb->last_error = TDB_SUCCESS;
return off ? true : false;
}
enum TDB_ERROR tdb_delete(struct tdb_context *tdb, struct tdb_data key)
{
tdb_off_t off;
struct tdb_used_record rec;
struct hash_info h;
enum TDB_ERROR ecode;
if (tdb->flags & TDB_VERSION1) {
if (tdb1_delete(tdb, key) == -1)
return tdb->last_error;
return TDB_SUCCESS;
}
off = find_and_lock(tdb, key, F_WRLCK, &h, &rec, NULL);
if (TDB_OFF_IS_ERR(off)) {
return tdb->last_error = off;
}
if (!off) {
ecode = TDB_ERR_NOEXIST;
goto unlock;
}
ecode = delete_from_hash(tdb, &h);
if (ecode != TDB_SUCCESS) {
goto unlock;
}
/* Free the deleted entry. */
tdb->stats.frees++;
ecode = add_free_record(tdb, off,
sizeof(struct tdb_used_record)
+ rec_key_length(&rec)
+ rec_data_length(&rec)
+ rec_extra_padding(&rec),
TDB_LOCK_WAIT, true);
if (tdb->flags & TDB_SEQNUM)
tdb_inc_seqnum(tdb);
unlock:
tdb_unlock_hashes(tdb, h.hlock_start, h.hlock_range, F_WRLCK);
return tdb->last_error = ecode;
}
unsigned int tdb_get_flags(struct tdb_context *tdb)
{
return tdb->flags;
}
static bool inside_transaction(const struct tdb_context *tdb)
{
if (tdb->flags & TDB_VERSION1)
return tdb->tdb1.transaction != NULL;
else
return tdb->tdb2.transaction != NULL;
}
static bool readonly_changable(struct tdb_context *tdb, const char *caller)
{
if (inside_transaction(tdb)) {
tdb->last_error = tdb_logerr(tdb, TDB_ERR_EINVAL,
TDB_LOG_USE_ERROR,
"%s: can't change"
" TDB_RDONLY inside transaction",
caller);
return false;
}
if (tdb->file->allrecord_lock.count != 0
|| tdb->file->num_lockrecs != 0) {
tdb->last_error = tdb_logerr(tdb, TDB_ERR_EINVAL,
TDB_LOG_USE_ERROR,
"%s: can't change"
" TDB_RDONLY holding locks",
caller);
return false;
}
return true;
}
void tdb_add_flag(struct tdb_context *tdb, unsigned flag)
{
if (tdb->flags & TDB_INTERNAL) {
tdb->last_error = tdb_logerr(tdb, TDB_ERR_EINVAL,
TDB_LOG_USE_ERROR,
"tdb_add_flag: internal db");
return;
}
switch (flag) {
case TDB_NOLOCK:
tdb->flags |= TDB_NOLOCK;
break;
case TDB_NOMMAP:
tdb->flags |= TDB_NOMMAP;
tdb_munmap(tdb->file);
break;
case TDB_NOSYNC:
tdb->flags |= TDB_NOSYNC;
break;
case TDB_SEQNUM:
tdb->flags |= TDB_SEQNUM;
break;
case TDB_ALLOW_NESTING:
tdb->flags |= TDB_ALLOW_NESTING;
break;
case TDB_RDONLY:
if (readonly_changable(tdb, "tdb_add_flag"))
tdb->flags |= TDB_RDONLY;
break;
default:
tdb->last_error = tdb_logerr(tdb, TDB_ERR_EINVAL,
TDB_LOG_USE_ERROR,
"tdb_add_flag: Unknown flag %u",
flag);
}
}
void tdb_remove_flag(struct tdb_context *tdb, unsigned flag)
{
if (tdb->flags & TDB_INTERNAL) {
tdb->last_error = tdb_logerr(tdb, TDB_ERR_EINVAL,
TDB_LOG_USE_ERROR,
"tdb_remove_flag: internal db");
return;
}
switch (flag) {
case TDB_NOLOCK:
tdb->flags &= ~TDB_NOLOCK;
break;
case TDB_NOMMAP:
tdb->flags &= ~TDB_NOMMAP;
tdb_mmap(tdb);
break;
case TDB_NOSYNC:
tdb->flags &= ~TDB_NOSYNC;
break;
case TDB_SEQNUM:
tdb->flags &= ~TDB_SEQNUM;
break;
case TDB_ALLOW_NESTING:
tdb->flags &= ~TDB_ALLOW_NESTING;
break;
case TDB_RDONLY:
if ((tdb->open_flags & O_ACCMODE) == O_RDONLY) {
tdb->last_error = tdb_logerr(tdb, TDB_ERR_EINVAL,
TDB_LOG_USE_ERROR,
"tdb_remove_flag: can't"
" remove TDB_RDONLY on tdb"
" opened with O_RDONLY");
break;
}
if (readonly_changable(tdb, "tdb_remove_flag"))
tdb->flags &= ~TDB_RDONLY;
break;
default:
tdb->last_error = tdb_logerr(tdb, TDB_ERR_EINVAL,
TDB_LOG_USE_ERROR,
"tdb_remove_flag: Unknown flag %u",
flag);
}
}
const char *tdb_errorstr(enum TDB_ERROR ecode)
{
/* Gcc warns if you miss a case in the switch, so use that. */
switch (ecode) {
case TDB_SUCCESS: return "Success";
case TDB_ERR_CORRUPT: return "Corrupt database";
case TDB_ERR_IO: return "IO Error";
case TDB_ERR_LOCK: return "Locking error";
case TDB_ERR_OOM: return "Out of memory";
case TDB_ERR_EXISTS: return "Record exists";
case TDB_ERR_EINVAL: return "Invalid parameter";
case TDB_ERR_NOEXIST: return "Record does not exist";
case TDB_ERR_RDONLY: return "write not permitted";
}
return "Invalid error code";
}
enum TDB_ERROR tdb_error(struct tdb_context *tdb)
{
return tdb->last_error;
}
enum TDB_ERROR COLD tdb_logerr(struct tdb_context *tdb,
enum TDB_ERROR ecode,
enum tdb_log_level level,
const char *fmt, ...)
{
char *message;
va_list ap;
size_t len;
/* tdb_open paths care about errno, so save it. */
int saved_errno = errno;
if (!tdb->log_fn)
return ecode;
va_start(ap, fmt);
len = vasprintf(&message, fmt, ap);
va_end(ap);
if (len < 0) {
tdb->log_fn(tdb, TDB_LOG_ERROR, TDB_ERR_OOM,
"out of memory formatting message:", tdb->log_data);
tdb->log_fn(tdb, level, ecode, fmt, tdb->log_data);
} else {
tdb->log_fn(tdb, level, ecode, message, tdb->log_data);
free(message);
}
errno = saved_errno;
return ecode;
}
enum TDB_ERROR tdb_parse_record_(struct tdb_context *tdb,
TDB_DATA key,
enum TDB_ERROR (*parse)(TDB_DATA k,
TDB_DATA d,
void *data),
void *data)
{
tdb_off_t off;
struct tdb_used_record rec;
struct hash_info h;
enum TDB_ERROR ecode;
if (tdb->flags & TDB_VERSION1) {
return tdb->last_error = tdb1_parse_record(tdb, key, parse,
data);
}
off = find_and_lock(tdb, key, F_RDLCK, &h, &rec, NULL);
if (TDB_OFF_IS_ERR(off)) {
return tdb->last_error = off;
}
if (!off) {
ecode = TDB_ERR_NOEXIST;
} else {
const void *dptr;
dptr = tdb_access_read(tdb, off + sizeof(rec) + key.dsize,
rec_data_length(&rec), false);
if (TDB_PTR_IS_ERR(dptr)) {
ecode = TDB_PTR_ERR(dptr);
} else {
TDB_DATA d = tdb_mkdata(dptr, rec_data_length(&rec));
ecode = parse(key, d, data);
tdb_access_release(tdb, dptr);
}
}
tdb_unlock_hashes(tdb, h.hlock_start, h.hlock_range, F_RDLCK);
return tdb->last_error = ecode;
}
const char *tdb_name(const struct tdb_context *tdb)
{
return tdb->name;
}
int64_t tdb_get_seqnum(struct tdb_context *tdb)
{
tdb_off_t off;
if (tdb->flags & TDB_VERSION1) {
tdb1_off_t val;
tdb->last_error = TDB_SUCCESS;
val = tdb1_get_seqnum(tdb);
if (tdb->last_error != TDB_SUCCESS)
return tdb->last_error;
else
return val;
}
off = tdb_read_off(tdb, offsetof(struct tdb_header, seqnum));
if (TDB_OFF_IS_ERR(off))
tdb->last_error = off;
else
tdb->last_error = TDB_SUCCESS;
return off;
}
int tdb_fd(const struct tdb_context *tdb)
{
return tdb->file->fd;
}
|