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bb0fb97562
Michael
1240 lines
31 KiB
C
1240 lines
31 KiB
C
/*
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Unix SMB/CIFS implementation.
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Database interface wrapper around ctdbd
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Copyright (C) Volker Lendecke 2007
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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 as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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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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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#ifdef CLUSTER_SUPPORT
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#include "ctdb.h"
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#include "ctdb_private.h"
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#include "ctdbd_conn.h"
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struct db_ctdb_transaction_handle {
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struct db_ctdb_ctx *ctx;
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bool in_replay;
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/* we store the reads and writes done under a transaction one
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list stores both reads and writes, the other just writes
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*/
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struct ctdb_marshall_buffer *m_all;
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struct ctdb_marshall_buffer *m_write;
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uint32_t nesting;
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bool nested_cancel;
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};
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struct db_ctdb_ctx {
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struct db_context *db;
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struct tdb_wrap *wtdb;
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uint32 db_id;
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struct db_ctdb_transaction_handle *transaction;
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};
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struct db_ctdb_rec {
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struct db_ctdb_ctx *ctdb_ctx;
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struct ctdb_ltdb_header header;
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};
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static struct db_record *fetch_locked_internal(struct db_ctdb_ctx *ctx,
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TALLOC_CTX *mem_ctx,
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TDB_DATA key,
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bool persistent);
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static NTSTATUS tdb_error_to_ntstatus(struct tdb_context *tdb)
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{
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NTSTATUS status;
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enum TDB_ERROR tret = tdb_error(tdb);
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switch (tret) {
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case TDB_ERR_EXISTS:
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status = NT_STATUS_OBJECT_NAME_COLLISION;
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break;
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case TDB_ERR_NOEXIST:
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status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
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break;
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default:
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status = NT_STATUS_INTERNAL_DB_CORRUPTION;
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break;
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}
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return status;
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}
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/*
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form a ctdb_rec_data record from a key/data pair
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note that header may be NULL. If not NULL then it is included in the data portion
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of the record
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*/
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static struct ctdb_rec_data *db_ctdb_marshall_record(TALLOC_CTX *mem_ctx, uint32_t reqid,
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TDB_DATA key,
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struct ctdb_ltdb_header *header,
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TDB_DATA data)
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{
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size_t length;
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struct ctdb_rec_data *d;
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length = offsetof(struct ctdb_rec_data, data) + key.dsize +
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data.dsize + (header?sizeof(*header):0);
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d = (struct ctdb_rec_data *)talloc_size(mem_ctx, length);
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if (d == NULL) {
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return NULL;
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}
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d->length = length;
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d->reqid = reqid;
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d->keylen = key.dsize;
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memcpy(&d->data[0], key.dptr, key.dsize);
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if (header) {
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d->datalen = data.dsize + sizeof(*header);
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memcpy(&d->data[key.dsize], header, sizeof(*header));
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memcpy(&d->data[key.dsize+sizeof(*header)], data.dptr, data.dsize);
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} else {
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d->datalen = data.dsize;
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memcpy(&d->data[key.dsize], data.dptr, data.dsize);
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}
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return d;
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}
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/* helper function for marshalling multiple records */
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static struct ctdb_marshall_buffer *db_ctdb_marshall_add(TALLOC_CTX *mem_ctx,
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struct ctdb_marshall_buffer *m,
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uint64_t db_id,
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uint32_t reqid,
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TDB_DATA key,
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struct ctdb_ltdb_header *header,
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TDB_DATA data)
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{
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struct ctdb_rec_data *r;
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size_t m_size, r_size;
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struct ctdb_marshall_buffer *m2 = NULL;
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r = db_ctdb_marshall_record(talloc_tos(), reqid, key, header, data);
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if (r == NULL) {
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talloc_free(m);
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return NULL;
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}
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if (m == NULL) {
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m = (struct ctdb_marshall_buffer *)talloc_zero_size(
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mem_ctx, offsetof(struct ctdb_marshall_buffer, data));
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if (m == NULL) {
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goto done;
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}
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m->db_id = db_id;
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}
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m_size = talloc_get_size(m);
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r_size = talloc_get_size(r);
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m2 = (struct ctdb_marshall_buffer *)talloc_realloc_size(
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mem_ctx, m, m_size + r_size);
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if (m2 == NULL) {
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talloc_free(m);
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goto done;
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}
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memcpy(m_size + (uint8_t *)m2, r, r_size);
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m2->count++;
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done:
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talloc_free(r);
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return m2;
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}
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/* we've finished marshalling, return a data blob with the marshalled records */
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static TDB_DATA db_ctdb_marshall_finish(struct ctdb_marshall_buffer *m)
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{
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TDB_DATA data;
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data.dptr = (uint8_t *)m;
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data.dsize = talloc_get_size(m);
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return data;
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}
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/*
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loop over a marshalling buffer
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- pass r==NULL to start
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- loop the number of times indicated by m->count
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*/
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static struct ctdb_rec_data *db_ctdb_marshall_loop_next(struct ctdb_marshall_buffer *m, struct ctdb_rec_data *r,
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uint32_t *reqid,
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struct ctdb_ltdb_header *header,
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TDB_DATA *key, TDB_DATA *data)
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{
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if (r == NULL) {
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r = (struct ctdb_rec_data *)&m->data[0];
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} else {
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r = (struct ctdb_rec_data *)(r->length + (uint8_t *)r);
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}
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if (reqid != NULL) {
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*reqid = r->reqid;
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}
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if (key != NULL) {
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key->dptr = &r->data[0];
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key->dsize = r->keylen;
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}
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if (data != NULL) {
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data->dptr = &r->data[r->keylen];
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data->dsize = r->datalen;
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if (header != NULL) {
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data->dptr += sizeof(*header);
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data->dsize -= sizeof(*header);
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}
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}
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if (header != NULL) {
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if (r->datalen < sizeof(*header)) {
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return NULL;
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}
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*header = *(struct ctdb_ltdb_header *)&r->data[r->keylen];
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}
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return r;
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}
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/* start a transaction on a database */
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static int db_ctdb_transaction_destructor(struct db_ctdb_transaction_handle *h)
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{
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tdb_transaction_cancel(h->ctx->wtdb->tdb);
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return 0;
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}
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/* start a transaction on a database */
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static int db_ctdb_transaction_fetch_start(struct db_ctdb_transaction_handle *h)
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{
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struct db_record *rh;
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TDB_DATA key;
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TALLOC_CTX *tmp_ctx;
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const char *keyname = CTDB_TRANSACTION_LOCK_KEY;
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int ret;
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struct db_ctdb_ctx *ctx = h->ctx;
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TDB_DATA data;
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key.dptr = (uint8_t *)discard_const(keyname);
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key.dsize = strlen(keyname);
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again:
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tmp_ctx = talloc_new(h);
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rh = fetch_locked_internal(ctx, tmp_ctx, key, true);
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if (rh == NULL) {
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DEBUG(0,(__location__ " Failed to fetch_lock database\n"));
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talloc_free(tmp_ctx);
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return -1;
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}
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talloc_free(rh);
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ret = tdb_transaction_start(ctx->wtdb->tdb);
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if (ret != 0) {
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DEBUG(0,(__location__ " Failed to start tdb transaction\n"));
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talloc_free(tmp_ctx);
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return -1;
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}
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data = tdb_fetch(ctx->wtdb->tdb, key);
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if ((data.dptr == NULL) ||
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(data.dsize < sizeof(struct ctdb_ltdb_header)) ||
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((struct ctdb_ltdb_header *)data.dptr)->dmaster != get_my_vnn()) {
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SAFE_FREE(data.dptr);
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tdb_transaction_cancel(ctx->wtdb->tdb);
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talloc_free(tmp_ctx);
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goto again;
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}
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SAFE_FREE(data.dptr);
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talloc_free(tmp_ctx);
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return 0;
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}
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/* start a transaction on a database */
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static int db_ctdb_transaction_start(struct db_context *db)
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{
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struct db_ctdb_transaction_handle *h;
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int ret;
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struct db_ctdb_ctx *ctx = talloc_get_type_abort(db->private_data,
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struct db_ctdb_ctx);
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if (!db->persistent) {
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DEBUG(0,("transactions not supported on non-persistent database 0x%08x\n",
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ctx->db_id));
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return -1;
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}
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if (ctx->transaction) {
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ctx->transaction->nesting++;
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return 0;
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}
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h = talloc_zero(db, struct db_ctdb_transaction_handle);
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if (h == NULL) {
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DEBUG(0,(__location__ " oom for transaction handle\n"));
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return -1;
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}
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h->ctx = ctx;
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ret = db_ctdb_transaction_fetch_start(h);
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if (ret != 0) {
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talloc_free(h);
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return -1;
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}
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talloc_set_destructor(h, db_ctdb_transaction_destructor);
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ctx->transaction = h;
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DEBUG(5,(__location__ " Started transaction on db 0x%08x\n", ctx->db_id));
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return 0;
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}
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/*
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fetch a record inside a transaction
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*/
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static int db_ctdb_transaction_fetch(struct db_ctdb_ctx *db,
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TALLOC_CTX *mem_ctx,
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TDB_DATA key, TDB_DATA *data)
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{
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struct db_ctdb_transaction_handle *h = db->transaction;
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*data = tdb_fetch(h->ctx->wtdb->tdb, key);
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if (data->dptr != NULL) {
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uint8_t *oldptr = (uint8_t *)data->dptr;
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data->dsize -= sizeof(struct ctdb_ltdb_header);
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if (data->dsize == 0) {
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data->dptr = NULL;
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} else {
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data->dptr = (uint8 *)
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talloc_memdup(
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mem_ctx, data->dptr+sizeof(struct ctdb_ltdb_header),
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data->dsize);
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}
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SAFE_FREE(oldptr);
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if (data->dptr == NULL && data->dsize != 0) {
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return -1;
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}
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}
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if (!h->in_replay) {
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h->m_all = db_ctdb_marshall_add(h, h->m_all, h->ctx->db_id, 1, key, NULL, *data);
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if (h->m_all == NULL) {
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DEBUG(0,(__location__ " Failed to add to marshalling record\n"));
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data->dsize = 0;
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talloc_free(data->dptr);
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return -1;
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}
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}
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return 0;
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}
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static NTSTATUS db_ctdb_store_transaction(struct db_record *rec, TDB_DATA data, int flag);
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static NTSTATUS db_ctdb_delete_transaction(struct db_record *rec);
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static struct db_record *db_ctdb_fetch_locked_transaction(struct db_ctdb_ctx *ctx,
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TALLOC_CTX *mem_ctx,
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TDB_DATA key)
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{
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struct db_record *result;
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TDB_DATA ctdb_data;
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if (!(result = talloc(mem_ctx, struct db_record))) {
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DEBUG(0, ("talloc failed\n"));
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return NULL;
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}
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result->private_data = ctx->transaction;
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result->key.dsize = key.dsize;
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result->key.dptr = (uint8 *)talloc_memdup(result, key.dptr, key.dsize);
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if (result->key.dptr == NULL) {
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DEBUG(0, ("talloc failed\n"));
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TALLOC_FREE(result);
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return NULL;
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}
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result->store = db_ctdb_store_transaction;
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result->delete_rec = db_ctdb_delete_transaction;
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ctdb_data = tdb_fetch(ctx->wtdb->tdb, key);
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if (ctdb_data.dptr == NULL) {
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/* create the record */
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result->value = tdb_null;
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return result;
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}
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result->value.dsize = ctdb_data.dsize - sizeof(struct ctdb_ltdb_header);
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result->value.dptr = NULL;
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if ((result->value.dsize != 0)
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&& !(result->value.dptr = (uint8 *)talloc_memdup(
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result, ctdb_data.dptr + sizeof(struct ctdb_ltdb_header),
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result->value.dsize))) {
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DEBUG(0, ("talloc failed\n"));
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TALLOC_FREE(result);
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}
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SAFE_FREE(ctdb_data.dptr);
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return result;
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}
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static int db_ctdb_record_destructor(struct db_record **recp)
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{
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struct db_record *rec = talloc_get_type_abort(*recp, struct db_record);
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struct db_ctdb_transaction_handle *h = talloc_get_type_abort(
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rec->private_data, struct db_ctdb_transaction_handle);
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int ret = h->ctx->db->transaction_commit(h->ctx->db);
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if (ret != 0) {
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DEBUG(0,(__location__ " transaction_commit failed\n"));
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}
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return 0;
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}
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|
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/*
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auto-create a transaction for persistent databases
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*/
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static struct db_record *db_ctdb_fetch_locked_persistent(struct db_ctdb_ctx *ctx,
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TALLOC_CTX *mem_ctx,
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TDB_DATA key)
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{
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int res;
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struct db_record *rec, **recp;
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res = db_ctdb_transaction_start(ctx->db);
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if (res == -1) {
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return NULL;
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}
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rec = db_ctdb_fetch_locked_transaction(ctx, mem_ctx, key);
|
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if (rec == NULL) {
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ctx->db->transaction_cancel(ctx->db);
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return NULL;
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}
|
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|
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/* destroy this transaction when we release the lock */
|
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recp = talloc(rec, struct db_record *);
|
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if (recp == NULL) {
|
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ctx->db->transaction_cancel(ctx->db);
|
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talloc_free(rec);
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return NULL;
|
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}
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*recp = rec;
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talloc_set_destructor(recp, db_ctdb_record_destructor);
|
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return rec;
|
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}
|
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|
|
|
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/*
|
|
stores a record inside a transaction
|
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*/
|
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static int db_ctdb_transaction_store(struct db_ctdb_transaction_handle *h,
|
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TDB_DATA key, TDB_DATA data)
|
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{
|
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TALLOC_CTX *tmp_ctx = talloc_new(h);
|
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int ret;
|
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TDB_DATA rec;
|
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struct ctdb_ltdb_header header;
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|
|
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/* we need the header so we can update the RSN */
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rec = tdb_fetch(h->ctx->wtdb->tdb, key);
|
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if (rec.dptr == NULL) {
|
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/* the record doesn't exist - create one with us as dmaster.
|
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This is only safe because we are in a transaction and this
|
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is a persistent database */
|
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ZERO_STRUCT(header);
|
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header.dmaster = get_my_vnn();
|
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} else {
|
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memcpy(&header, rec.dptr, sizeof(struct ctdb_ltdb_header));
|
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rec.dsize -= sizeof(struct ctdb_ltdb_header);
|
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/* a special case, we are writing the same data that is there now */
|
|
if (data.dsize == rec.dsize &&
|
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memcmp(data.dptr, rec.dptr + sizeof(struct ctdb_ltdb_header), data.dsize) == 0) {
|
|
SAFE_FREE(rec.dptr);
|
|
talloc_free(tmp_ctx);
|
|
return 0;
|
|
}
|
|
SAFE_FREE(rec.dptr);
|
|
}
|
|
|
|
header.rsn++;
|
|
|
|
if (!h->in_replay) {
|
|
h->m_all = db_ctdb_marshall_add(h, h->m_all, h->ctx->db_id, 0, key, NULL, data);
|
|
if (h->m_all == NULL) {
|
|
DEBUG(0,(__location__ " Failed to add to marshalling record\n"));
|
|
talloc_free(tmp_ctx);
|
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return -1;
|
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}
|
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}
|
|
|
|
h->m_write = db_ctdb_marshall_add(h, h->m_write, h->ctx->db_id, 0, key, &header, data);
|
|
if (h->m_write == NULL) {
|
|
DEBUG(0,(__location__ " Failed to add to marshalling record\n"));
|
|
talloc_free(tmp_ctx);
|
|
return -1;
|
|
}
|
|
|
|
rec.dsize = data.dsize + sizeof(struct ctdb_ltdb_header);
|
|
rec.dptr = (uint8_t *)talloc_size(tmp_ctx, rec.dsize);
|
|
if (rec.dptr == NULL) {
|
|
DEBUG(0,(__location__ " Failed to alloc record\n"));
|
|
talloc_free(tmp_ctx);
|
|
return -1;
|
|
}
|
|
memcpy(rec.dptr, &header, sizeof(struct ctdb_ltdb_header));
|
|
memcpy(sizeof(struct ctdb_ltdb_header) + (uint8_t *)rec.dptr, data.dptr, data.dsize);
|
|
|
|
ret = tdb_store(h->ctx->wtdb->tdb, key, rec, TDB_REPLACE);
|
|
|
|
talloc_free(tmp_ctx);
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
/*
|
|
a record store inside a transaction
|
|
*/
|
|
static NTSTATUS db_ctdb_store_transaction(struct db_record *rec, TDB_DATA data, int flag)
|
|
{
|
|
struct db_ctdb_transaction_handle *h = talloc_get_type_abort(
|
|
rec->private_data, struct db_ctdb_transaction_handle);
|
|
int ret;
|
|
|
|
ret = db_ctdb_transaction_store(h, rec->key, data);
|
|
if (ret != 0) {
|
|
return tdb_error_to_ntstatus(h->ctx->wtdb->tdb);
|
|
}
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
/*
|
|
a record delete inside a transaction
|
|
*/
|
|
static NTSTATUS db_ctdb_delete_transaction(struct db_record *rec)
|
|
{
|
|
struct db_ctdb_transaction_handle *h = talloc_get_type_abort(
|
|
rec->private_data, struct db_ctdb_transaction_handle);
|
|
int ret;
|
|
|
|
ret = db_ctdb_transaction_store(h, rec->key, tdb_null);
|
|
if (ret != 0) {
|
|
return tdb_error_to_ntstatus(h->ctx->wtdb->tdb);
|
|
}
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
|
|
/*
|
|
replay a transaction
|
|
*/
|
|
static int ctdb_replay_transaction(struct db_ctdb_transaction_handle *h)
|
|
{
|
|
int ret, i;
|
|
struct ctdb_rec_data *rec = NULL;
|
|
|
|
h->in_replay = true;
|
|
talloc_free(h->m_write);
|
|
h->m_write = NULL;
|
|
|
|
ret = db_ctdb_transaction_fetch_start(h);
|
|
if (ret != 0) {
|
|
return ret;
|
|
}
|
|
|
|
for (i=0;i<h->m_all->count;i++) {
|
|
TDB_DATA key, data;
|
|
|
|
rec = db_ctdb_marshall_loop_next(h->m_all, rec, NULL, NULL, &key, &data);
|
|
if (rec == NULL) {
|
|
DEBUG(0, (__location__ " Out of records in ctdb_replay_transaction?\n"));
|
|
goto failed;
|
|
}
|
|
|
|
if (rec->reqid == 0) {
|
|
/* its a store */
|
|
if (db_ctdb_transaction_store(h, key, data) != 0) {
|
|
goto failed;
|
|
}
|
|
} else {
|
|
TDB_DATA data2;
|
|
TALLOC_CTX *tmp_ctx = talloc_new(h);
|
|
|
|
if (db_ctdb_transaction_fetch(h->ctx, tmp_ctx, key, &data2) != 0) {
|
|
talloc_free(tmp_ctx);
|
|
goto failed;
|
|
}
|
|
if (data2.dsize != data.dsize ||
|
|
memcmp(data2.dptr, data.dptr, data.dsize) != 0) {
|
|
/* the record has changed on us - we have to give up */
|
|
talloc_free(tmp_ctx);
|
|
goto failed;
|
|
}
|
|
talloc_free(tmp_ctx);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
failed:
|
|
tdb_transaction_cancel(h->ctx->wtdb->tdb);
|
|
return -1;
|
|
}
|
|
|
|
|
|
/*
|
|
commit a transaction
|
|
*/
|
|
static int db_ctdb_transaction_commit(struct db_context *db)
|
|
{
|
|
struct db_ctdb_ctx *ctx = talloc_get_type_abort(db->private_data,
|
|
struct db_ctdb_ctx);
|
|
NTSTATUS rets;
|
|
int ret;
|
|
int status;
|
|
int retries = 0;
|
|
struct db_ctdb_transaction_handle *h = ctx->transaction;
|
|
enum ctdb_controls failure_control = CTDB_CONTROL_TRANS2_ERROR;
|
|
|
|
if (h == NULL) {
|
|
DEBUG(0,(__location__ " transaction commit with no open transaction on db 0x%08x\n", ctx->db_id));
|
|
return -1;
|
|
}
|
|
|
|
if (h->nested_cancel) {
|
|
db->transaction_cancel(db);
|
|
DEBUG(5,(__location__ " Failed transaction commit after nested cancel\n"));
|
|
return -1;
|
|
}
|
|
|
|
if (h->nesting != 0) {
|
|
h->nesting--;
|
|
return 0;
|
|
}
|
|
|
|
DEBUG(5,(__location__ " Commit transaction on db 0x%08x\n", ctx->db_id));
|
|
|
|
talloc_set_destructor(h, NULL);
|
|
|
|
/* our commit strategy is quite complex.
|
|
|
|
- we first try to commit the changes to all other nodes
|
|
|
|
- if that works, then we commit locally and we are done
|
|
|
|
- if a commit on another node fails, then we need to cancel
|
|
the transaction, then restart the transaction (thus
|
|
opening a window of time for a pending recovery to
|
|
complete), then replay the transaction, checking all the
|
|
reads and writes (checking that reads give the same data,
|
|
and writes succeed). Then we retry the transaction to the
|
|
other nodes
|
|
*/
|
|
|
|
again:
|
|
if (h->m_write == NULL) {
|
|
/* no changes were made, potentially after a retry */
|
|
tdb_transaction_cancel(h->ctx->wtdb->tdb);
|
|
talloc_free(h);
|
|
ctx->transaction = NULL;
|
|
return 0;
|
|
}
|
|
|
|
/* tell ctdbd to commit to the other nodes */
|
|
rets = ctdbd_control_local(messaging_ctdbd_connection(),
|
|
retries==0?CTDB_CONTROL_TRANS2_COMMIT:CTDB_CONTROL_TRANS2_COMMIT_RETRY,
|
|
h->ctx->db_id, 0,
|
|
db_ctdb_marshall_finish(h->m_write), NULL, NULL, &status);
|
|
if (!NT_STATUS_IS_OK(rets) || status != 0) {
|
|
tdb_transaction_cancel(h->ctx->wtdb->tdb);
|
|
sleep(1);
|
|
|
|
if (!NT_STATUS_IS_OK(rets)) {
|
|
failure_control = CTDB_CONTROL_TRANS2_ERROR;
|
|
} else {
|
|
/* work out what error code we will give if we
|
|
have to fail the operation */
|
|
switch ((enum ctdb_trans2_commit_error)status) {
|
|
case CTDB_TRANS2_COMMIT_SUCCESS:
|
|
case CTDB_TRANS2_COMMIT_SOMEFAIL:
|
|
case CTDB_TRANS2_COMMIT_TIMEOUT:
|
|
failure_control = CTDB_CONTROL_TRANS2_ERROR;
|
|
break;
|
|
case CTDB_TRANS2_COMMIT_ALLFAIL:
|
|
failure_control = CTDB_CONTROL_TRANS2_FINISHED;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (++retries == 5) {
|
|
DEBUG(0,(__location__ " Giving up transaction on db 0x%08x after %d retries failure_control=%u\n",
|
|
h->ctx->db_id, retries, (unsigned)failure_control));
|
|
ctdbd_control_local(messaging_ctdbd_connection(), failure_control,
|
|
h->ctx->db_id, CTDB_CTRL_FLAG_NOREPLY,
|
|
tdb_null, NULL, NULL, NULL);
|
|
h->ctx->transaction = NULL;
|
|
talloc_free(h);
|
|
ctx->transaction = NULL;
|
|
return -1;
|
|
}
|
|
|
|
if (ctdb_replay_transaction(h) != 0) {
|
|
DEBUG(0,(__location__ " Failed to replay transaction failure_control=%u\n",
|
|
(unsigned)failure_control));
|
|
ctdbd_control_local(messaging_ctdbd_connection(), failure_control,
|
|
h->ctx->db_id, CTDB_CTRL_FLAG_NOREPLY,
|
|
tdb_null, NULL, NULL, NULL);
|
|
h->ctx->transaction = NULL;
|
|
talloc_free(h);
|
|
ctx->transaction = NULL;
|
|
return -1;
|
|
}
|
|
goto again;
|
|
} else {
|
|
failure_control = CTDB_CONTROL_TRANS2_ERROR;
|
|
}
|
|
|
|
/* do the real commit locally */
|
|
ret = tdb_transaction_commit(h->ctx->wtdb->tdb);
|
|
if (ret != 0) {
|
|
DEBUG(0,(__location__ " Failed to commit transaction failure_control=%u\n",
|
|
(unsigned)failure_control));
|
|
ctdbd_control_local(messaging_ctdbd_connection(), failure_control, h->ctx->db_id,
|
|
CTDB_CTRL_FLAG_NOREPLY, tdb_null, NULL, NULL, NULL);
|
|
h->ctx->transaction = NULL;
|
|
talloc_free(h);
|
|
return ret;
|
|
}
|
|
|
|
/* tell ctdbd that we are finished with our local commit */
|
|
ctdbd_control_local(messaging_ctdbd_connection(), CTDB_CONTROL_TRANS2_FINISHED,
|
|
h->ctx->db_id, CTDB_CTRL_FLAG_NOREPLY,
|
|
tdb_null, NULL, NULL, NULL);
|
|
h->ctx->transaction = NULL;
|
|
talloc_free(h);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
cancel a transaction
|
|
*/
|
|
static int db_ctdb_transaction_cancel(struct db_context *db)
|
|
{
|
|
struct db_ctdb_ctx *ctx = talloc_get_type_abort(db->private_data,
|
|
struct db_ctdb_ctx);
|
|
struct db_ctdb_transaction_handle *h = ctx->transaction;
|
|
|
|
if (h == NULL) {
|
|
DEBUG(0,(__location__ " transaction cancel with no open transaction on db 0x%08x\n", ctx->db_id));
|
|
return -1;
|
|
}
|
|
|
|
if (h->nesting != 0) {
|
|
h->nesting--;
|
|
h->nested_cancel = true;
|
|
return 0;
|
|
}
|
|
|
|
DEBUG(5,(__location__ " Cancel transaction on db 0x%08x\n", ctx->db_id));
|
|
|
|
ctx->transaction = NULL;
|
|
talloc_free(h);
|
|
return 0;
|
|
}
|
|
|
|
|
|
static NTSTATUS db_ctdb_store(struct db_record *rec, TDB_DATA data, int flag)
|
|
{
|
|
struct db_ctdb_rec *crec = talloc_get_type_abort(
|
|
rec->private_data, struct db_ctdb_rec);
|
|
TDB_DATA cdata;
|
|
int ret;
|
|
|
|
cdata.dsize = sizeof(crec->header) + data.dsize;
|
|
|
|
if (!(cdata.dptr = SMB_MALLOC_ARRAY(uint8, cdata.dsize))) {
|
|
return NT_STATUS_NO_MEMORY;
|
|
}
|
|
|
|
memcpy(cdata.dptr, &crec->header, sizeof(crec->header));
|
|
memcpy(cdata.dptr + sizeof(crec->header), data.dptr, data.dsize);
|
|
|
|
ret = tdb_store(crec->ctdb_ctx->wtdb->tdb, rec->key, cdata, TDB_REPLACE);
|
|
|
|
SAFE_FREE(cdata.dptr);
|
|
|
|
return (ret == 0) ? NT_STATUS_OK
|
|
: tdb_error_to_ntstatus(crec->ctdb_ctx->wtdb->tdb);
|
|
}
|
|
|
|
|
|
|
|
static NTSTATUS db_ctdb_delete(struct db_record *rec)
|
|
{
|
|
TDB_DATA data;
|
|
|
|
/*
|
|
* We have to store the header with empty data. TODO: Fix the
|
|
* tdb-level cleanup
|
|
*/
|
|
|
|
ZERO_STRUCT(data);
|
|
|
|
return db_ctdb_store(rec, data, 0);
|
|
|
|
}
|
|
|
|
static int db_ctdb_record_destr(struct db_record* data)
|
|
{
|
|
struct db_ctdb_rec *crec = talloc_get_type_abort(
|
|
data->private_data, struct db_ctdb_rec);
|
|
|
|
DEBUG(10, (DEBUGLEVEL > 10
|
|
? "Unlocking db %u key %s\n"
|
|
: "Unlocking db %u key %.20s\n",
|
|
(int)crec->ctdb_ctx->db_id,
|
|
hex_encode_talloc(data, (unsigned char *)data->key.dptr,
|
|
data->key.dsize)));
|
|
|
|
if (tdb_chainunlock(crec->ctdb_ctx->wtdb->tdb, data->key) != 0) {
|
|
DEBUG(0, ("tdb_chainunlock failed\n"));
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct db_record *fetch_locked_internal(struct db_ctdb_ctx *ctx,
|
|
TALLOC_CTX *mem_ctx,
|
|
TDB_DATA key,
|
|
bool persistent)
|
|
{
|
|
struct db_record *result;
|
|
struct db_ctdb_rec *crec;
|
|
NTSTATUS status;
|
|
TDB_DATA ctdb_data;
|
|
int migrate_attempts = 0;
|
|
|
|
if (!(result = talloc(mem_ctx, struct db_record))) {
|
|
DEBUG(0, ("talloc failed\n"));
|
|
return NULL;
|
|
}
|
|
|
|
if (!(crec = TALLOC_ZERO_P(result, struct db_ctdb_rec))) {
|
|
DEBUG(0, ("talloc failed\n"));
|
|
TALLOC_FREE(result);
|
|
return NULL;
|
|
}
|
|
|
|
result->private_data = (void *)crec;
|
|
crec->ctdb_ctx = ctx;
|
|
|
|
result->key.dsize = key.dsize;
|
|
result->key.dptr = (uint8 *)talloc_memdup(result, key.dptr, key.dsize);
|
|
if (result->key.dptr == NULL) {
|
|
DEBUG(0, ("talloc failed\n"));
|
|
TALLOC_FREE(result);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Do a blocking lock on the record
|
|
*/
|
|
again:
|
|
|
|
if (DEBUGLEVEL >= 10) {
|
|
char *keystr = hex_encode_talloc(result, key.dptr, key.dsize);
|
|
DEBUG(10, (DEBUGLEVEL > 10
|
|
? "Locking db %u key %s\n"
|
|
: "Locking db %u key %.20s\n",
|
|
(int)crec->ctdb_ctx->db_id, keystr));
|
|
TALLOC_FREE(keystr);
|
|
}
|
|
|
|
if (tdb_chainlock(ctx->wtdb->tdb, key) != 0) {
|
|
DEBUG(3, ("tdb_chainlock failed\n"));
|
|
TALLOC_FREE(result);
|
|
return NULL;
|
|
}
|
|
|
|
result->store = db_ctdb_store;
|
|
result->delete_rec = db_ctdb_delete;
|
|
talloc_set_destructor(result, db_ctdb_record_destr);
|
|
|
|
ctdb_data = tdb_fetch(ctx->wtdb->tdb, key);
|
|
|
|
/*
|
|
* See if we have a valid record and we are the dmaster. If so, we can
|
|
* take the shortcut and just return it.
|
|
*/
|
|
|
|
if ((ctdb_data.dptr == NULL) ||
|
|
(ctdb_data.dsize < sizeof(struct ctdb_ltdb_header)) ||
|
|
((struct ctdb_ltdb_header *)ctdb_data.dptr)->dmaster != get_my_vnn()
|
|
#if 0
|
|
|| (random() % 2 != 0)
|
|
#endif
|
|
) {
|
|
SAFE_FREE(ctdb_data.dptr);
|
|
tdb_chainunlock(ctx->wtdb->tdb, key);
|
|
talloc_set_destructor(result, NULL);
|
|
|
|
migrate_attempts += 1;
|
|
|
|
DEBUG(10, ("ctdb_data.dptr = %p, dmaster = %u (%u)\n",
|
|
ctdb_data.dptr, ctdb_data.dptr ?
|
|
((struct ctdb_ltdb_header *)ctdb_data.dptr)->dmaster : -1,
|
|
get_my_vnn()));
|
|
|
|
status = ctdbd_migrate(messaging_ctdbd_connection(),ctx->db_id, key);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DEBUG(5, ("ctdb_migrate failed: %s\n",
|
|
nt_errstr(status)));
|
|
TALLOC_FREE(result);
|
|
return NULL;
|
|
}
|
|
/* now its migrated, try again */
|
|
goto again;
|
|
}
|
|
|
|
if (migrate_attempts > 10) {
|
|
DEBUG(0, ("db_ctdb_fetch_locked needed %d attempts\n",
|
|
migrate_attempts));
|
|
}
|
|
|
|
memcpy(&crec->header, ctdb_data.dptr, sizeof(crec->header));
|
|
|
|
result->value.dsize = ctdb_data.dsize - sizeof(crec->header);
|
|
result->value.dptr = NULL;
|
|
|
|
if ((result->value.dsize != 0)
|
|
&& !(result->value.dptr = (uint8 *)talloc_memdup(
|
|
result, ctdb_data.dptr + sizeof(crec->header),
|
|
result->value.dsize))) {
|
|
DEBUG(0, ("talloc failed\n"));
|
|
TALLOC_FREE(result);
|
|
}
|
|
|
|
SAFE_FREE(ctdb_data.dptr);
|
|
|
|
return result;
|
|
}
|
|
|
|
static struct db_record *db_ctdb_fetch_locked(struct db_context *db,
|
|
TALLOC_CTX *mem_ctx,
|
|
TDB_DATA key)
|
|
{
|
|
struct db_ctdb_ctx *ctx = talloc_get_type_abort(db->private_data,
|
|
struct db_ctdb_ctx);
|
|
|
|
if (ctx->transaction != NULL) {
|
|
return db_ctdb_fetch_locked_transaction(ctx, mem_ctx, key);
|
|
}
|
|
|
|
if (db->persistent) {
|
|
return db_ctdb_fetch_locked_persistent(ctx, mem_ctx, key);
|
|
}
|
|
|
|
return fetch_locked_internal(ctx, mem_ctx, key, db->persistent);
|
|
}
|
|
|
|
/*
|
|
fetch (unlocked, no migration) operation on ctdb
|
|
*/
|
|
static int db_ctdb_fetch(struct db_context *db, TALLOC_CTX *mem_ctx,
|
|
TDB_DATA key, TDB_DATA *data)
|
|
{
|
|
struct db_ctdb_ctx *ctx = talloc_get_type_abort(db->private_data,
|
|
struct db_ctdb_ctx);
|
|
NTSTATUS status;
|
|
TDB_DATA ctdb_data;
|
|
|
|
if (ctx->transaction) {
|
|
return db_ctdb_transaction_fetch(ctx, mem_ctx, key, data);
|
|
}
|
|
|
|
/* try a direct fetch */
|
|
ctdb_data = tdb_fetch(ctx->wtdb->tdb, key);
|
|
|
|
/*
|
|
* See if we have a valid record and we are the dmaster. If so, we can
|
|
* take the shortcut and just return it.
|
|
* we bypass the dmaster check for persistent databases
|
|
*/
|
|
if ((ctdb_data.dptr != NULL) &&
|
|
(ctdb_data.dsize >= sizeof(struct ctdb_ltdb_header)) &&
|
|
(db->persistent ||
|
|
((struct ctdb_ltdb_header *)ctdb_data.dptr)->dmaster == get_my_vnn())) {
|
|
/* we are the dmaster - avoid the ctdb protocol op */
|
|
|
|
data->dsize = ctdb_data.dsize - sizeof(struct ctdb_ltdb_header);
|
|
if (data->dsize == 0) {
|
|
SAFE_FREE(ctdb_data.dptr);
|
|
data->dptr = NULL;
|
|
return 0;
|
|
}
|
|
|
|
data->dptr = (uint8 *)talloc_memdup(
|
|
mem_ctx, ctdb_data.dptr+sizeof(struct ctdb_ltdb_header),
|
|
data->dsize);
|
|
|
|
SAFE_FREE(ctdb_data.dptr);
|
|
|
|
if (data->dptr == NULL) {
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
SAFE_FREE(ctdb_data.dptr);
|
|
|
|
/* we weren't able to get it locally - ask ctdb to fetch it for us */
|
|
status = ctdbd_fetch(messaging_ctdbd_connection(),ctx->db_id, key, mem_ctx, data);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DEBUG(5, ("ctdbd_fetch failed: %s\n", nt_errstr(status)));
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct traverse_state {
|
|
struct db_context *db;
|
|
int (*fn)(struct db_record *rec, void *private_data);
|
|
void *private_data;
|
|
};
|
|
|
|
static void traverse_callback(TDB_DATA key, TDB_DATA data, void *private_data)
|
|
{
|
|
struct traverse_state *state = (struct traverse_state *)private_data;
|
|
struct db_record *rec;
|
|
TALLOC_CTX *tmp_ctx = talloc_new(state->db);
|
|
/* we have to give them a locked record to prevent races */
|
|
rec = db_ctdb_fetch_locked(state->db, tmp_ctx, key);
|
|
if (rec && rec->value.dsize > 0) {
|
|
state->fn(rec, state->private_data);
|
|
}
|
|
talloc_free(tmp_ctx);
|
|
}
|
|
|
|
static int traverse_persistent_callback(TDB_CONTEXT *tdb, TDB_DATA kbuf, TDB_DATA dbuf,
|
|
void *private_data)
|
|
{
|
|
struct traverse_state *state = (struct traverse_state *)private_data;
|
|
struct db_record *rec;
|
|
TALLOC_CTX *tmp_ctx = talloc_new(state->db);
|
|
int ret = 0;
|
|
/* we have to give them a locked record to prevent races */
|
|
rec = db_ctdb_fetch_locked(state->db, tmp_ctx, kbuf);
|
|
if (rec && rec->value.dsize > 0) {
|
|
ret = state->fn(rec, state->private_data);
|
|
}
|
|
talloc_free(tmp_ctx);
|
|
return ret;
|
|
}
|
|
|
|
static int db_ctdb_traverse(struct db_context *db,
|
|
int (*fn)(struct db_record *rec,
|
|
void *private_data),
|
|
void *private_data)
|
|
{
|
|
struct db_ctdb_ctx *ctx = talloc_get_type_abort(db->private_data,
|
|
struct db_ctdb_ctx);
|
|
struct traverse_state state;
|
|
|
|
state.db = db;
|
|
state.fn = fn;
|
|
state.private_data = private_data;
|
|
|
|
if (db->persistent) {
|
|
/* for persistent databases we don't need to do a ctdb traverse,
|
|
we can do a faster local traverse */
|
|
return tdb_traverse(ctx->wtdb->tdb, traverse_persistent_callback, &state);
|
|
}
|
|
|
|
|
|
ctdbd_traverse(ctx->db_id, traverse_callback, &state);
|
|
return 0;
|
|
}
|
|
|
|
static NTSTATUS db_ctdb_store_deny(struct db_record *rec, TDB_DATA data, int flag)
|
|
{
|
|
return NT_STATUS_MEDIA_WRITE_PROTECTED;
|
|
}
|
|
|
|
static NTSTATUS db_ctdb_delete_deny(struct db_record *rec)
|
|
{
|
|
return NT_STATUS_MEDIA_WRITE_PROTECTED;
|
|
}
|
|
|
|
static void traverse_read_callback(TDB_DATA key, TDB_DATA data, void *private_data)
|
|
{
|
|
struct traverse_state *state = (struct traverse_state *)private_data;
|
|
struct db_record rec;
|
|
rec.key = key;
|
|
rec.value = data;
|
|
rec.store = db_ctdb_store_deny;
|
|
rec.delete_rec = db_ctdb_delete_deny;
|
|
rec.private_data = state->db;
|
|
state->fn(&rec, state->private_data);
|
|
}
|
|
|
|
static int traverse_persistent_callback_read(TDB_CONTEXT *tdb, TDB_DATA kbuf, TDB_DATA dbuf,
|
|
void *private_data)
|
|
{
|
|
struct traverse_state *state = (struct traverse_state *)private_data;
|
|
struct db_record rec;
|
|
rec.key = kbuf;
|
|
rec.value = dbuf;
|
|
rec.store = db_ctdb_store_deny;
|
|
rec.delete_rec = db_ctdb_delete_deny;
|
|
rec.private_data = state->db;
|
|
|
|
if (rec.value.dsize <= sizeof(struct ctdb_ltdb_header)) {
|
|
/* a deleted record */
|
|
return 0;
|
|
}
|
|
rec.value.dsize -= sizeof(struct ctdb_ltdb_header);
|
|
rec.value.dptr += sizeof(struct ctdb_ltdb_header);
|
|
|
|
return state->fn(&rec, state->private_data);
|
|
}
|
|
|
|
static int db_ctdb_traverse_read(struct db_context *db,
|
|
int (*fn)(struct db_record *rec,
|
|
void *private_data),
|
|
void *private_data)
|
|
{
|
|
struct db_ctdb_ctx *ctx = talloc_get_type_abort(db->private_data,
|
|
struct db_ctdb_ctx);
|
|
struct traverse_state state;
|
|
|
|
state.db = db;
|
|
state.fn = fn;
|
|
state.private_data = private_data;
|
|
|
|
if (db->persistent) {
|
|
/* for persistent databases we don't need to do a ctdb traverse,
|
|
we can do a faster local traverse */
|
|
return tdb_traverse_read(ctx->wtdb->tdb, traverse_persistent_callback_read, &state);
|
|
}
|
|
|
|
ctdbd_traverse(ctx->db_id, traverse_read_callback, &state);
|
|
return 0;
|
|
}
|
|
|
|
static int db_ctdb_get_seqnum(struct db_context *db)
|
|
{
|
|
struct db_ctdb_ctx *ctx = talloc_get_type_abort(db->private_data,
|
|
struct db_ctdb_ctx);
|
|
return tdb_get_seqnum(ctx->wtdb->tdb);
|
|
}
|
|
|
|
static int db_ctdb_get_flags(struct db_context *db)
|
|
{
|
|
struct db_ctdb_ctx *ctx = talloc_get_type_abort(db->private_data,
|
|
struct db_ctdb_ctx);
|
|
return tdb_get_flags(ctx->wtdb->tdb);
|
|
}
|
|
|
|
struct db_context *db_open_ctdb(TALLOC_CTX *mem_ctx,
|
|
const char *name,
|
|
int hash_size, int tdb_flags,
|
|
int open_flags, mode_t mode)
|
|
{
|
|
struct db_context *result;
|
|
struct db_ctdb_ctx *db_ctdb;
|
|
char *db_path;
|
|
|
|
if (!lp_clustering()) {
|
|
DEBUG(10, ("Clustering disabled -- no ctdb\n"));
|
|
return NULL;
|
|
}
|
|
|
|
if (!(result = TALLOC_ZERO_P(mem_ctx, struct db_context))) {
|
|
DEBUG(0, ("talloc failed\n"));
|
|
TALLOC_FREE(result);
|
|
return NULL;
|
|
}
|
|
|
|
if (!(db_ctdb = TALLOC_P(result, struct db_ctdb_ctx))) {
|
|
DEBUG(0, ("talloc failed\n"));
|
|
TALLOC_FREE(result);
|
|
return NULL;
|
|
}
|
|
|
|
db_ctdb->transaction = NULL;
|
|
db_ctdb->db = result;
|
|
|
|
if (!NT_STATUS_IS_OK(ctdbd_db_attach(messaging_ctdbd_connection(),name, &db_ctdb->db_id, tdb_flags))) {
|
|
DEBUG(0, ("ctdbd_db_attach failed for %s\n", name));
|
|
TALLOC_FREE(result);
|
|
return NULL;
|
|
}
|
|
|
|
db_path = ctdbd_dbpath(messaging_ctdbd_connection(), db_ctdb, db_ctdb->db_id);
|
|
|
|
result->persistent = ((tdb_flags & TDB_CLEAR_IF_FIRST) == 0);
|
|
|
|
/* only pass through specific flags */
|
|
tdb_flags &= TDB_SEQNUM;
|
|
|
|
/* honor permissions if user has specified O_CREAT */
|
|
if (open_flags & O_CREAT) {
|
|
chmod(db_path, mode);
|
|
}
|
|
|
|
db_ctdb->wtdb = tdb_wrap_open(db_ctdb, db_path, hash_size, tdb_flags, O_RDWR, 0);
|
|
if (db_ctdb->wtdb == NULL) {
|
|
DEBUG(0, ("Could not open tdb %s: %s\n", db_path, strerror(errno)));
|
|
TALLOC_FREE(result);
|
|
return NULL;
|
|
}
|
|
talloc_free(db_path);
|
|
|
|
result->private_data = (void *)db_ctdb;
|
|
result->fetch_locked = db_ctdb_fetch_locked;
|
|
result->fetch = db_ctdb_fetch;
|
|
result->traverse = db_ctdb_traverse;
|
|
result->traverse_read = db_ctdb_traverse_read;
|
|
result->get_seqnum = db_ctdb_get_seqnum;
|
|
result->get_flags = db_ctdb_get_flags;
|
|
result->transaction_start = db_ctdb_transaction_start;
|
|
result->transaction_commit = db_ctdb_transaction_commit;
|
|
result->transaction_cancel = db_ctdb_transaction_cancel;
|
|
|
|
DEBUG(3,("db_open_ctdb: opened database '%s' with dbid 0x%x\n",
|
|
name, db_ctdb->db_id));
|
|
|
|
return result;
|
|
}
|
|
#endif
|