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45e61fcf61
This will be used to enforce a lock hierarchy between the databases. We have seen deadlocks between locking.tdb, brlock.tdb, serverid.tdb and notify*.tdb. These should be fixed by refusing a dbwrap_fetch_locked that does not follow a defined lock hierarchy.
812 lines
20 KiB
C
812 lines
20 KiB
C
/*
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Unix SMB/CIFS implementation.
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global locks based on dbwrap and messaging
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Copyright (C) 2009 by Volker Lendecke
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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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#include "system/filesys.h"
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#include "dbwrap/dbwrap.h"
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#include "dbwrap/dbwrap_open.h"
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#include "g_lock.h"
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#include "util_tdb.h"
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#include "ctdbd_conn.h"
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#include "../lib/util/select.h"
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#include "system/select.h"
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#include "messages.h"
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static NTSTATUS g_lock_force_unlock(struct g_lock_ctx *ctx, const char *name,
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struct server_id pid);
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struct g_lock_ctx {
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struct db_context *db;
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struct messaging_context *msg;
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};
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/*
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* The "g_lock.tdb" file contains records, indexed by the 0-terminated
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* lockname. The record contains an array of "struct g_lock_rec"
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* structures. Waiters have the lock_type with G_LOCK_PENDING or'ed.
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*/
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struct g_lock_rec {
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enum g_lock_type lock_type;
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struct server_id pid;
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};
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struct g_lock_ctx *g_lock_ctx_init(TALLOC_CTX *mem_ctx,
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struct messaging_context *msg)
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{
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struct g_lock_ctx *result;
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result = talloc(mem_ctx, struct g_lock_ctx);
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if (result == NULL) {
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return NULL;
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}
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result->msg = msg;
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result->db = db_open(result, lock_path("g_lock.tdb"), 0,
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TDB_CLEAR_IF_FIRST|TDB_INCOMPATIBLE_HASH,
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O_RDWR|O_CREAT, 0600,
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DBWRAP_LOCK_ORDER_2);
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if (result->db == NULL) {
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DEBUG(1, ("g_lock_init: Could not open g_lock.tdb\n"));
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TALLOC_FREE(result);
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return NULL;
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}
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return result;
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}
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static bool g_lock_conflicts(enum g_lock_type lock_type,
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const struct g_lock_rec *rec)
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{
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enum g_lock_type rec_lock = rec->lock_type;
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if ((rec_lock & G_LOCK_PENDING) != 0) {
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return false;
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}
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/*
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* Only tested write locks so far. Very likely this routine
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* needs to be fixed for read locks....
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*/
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if ((lock_type == G_LOCK_READ) && (rec_lock == G_LOCK_READ)) {
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return false;
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}
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return true;
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}
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static bool g_lock_parse(TALLOC_CTX *mem_ctx, TDB_DATA data,
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int *pnum_locks, struct g_lock_rec **plocks)
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{
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int i, num_locks;
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struct g_lock_rec *locks;
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if ((data.dsize % sizeof(struct g_lock_rec)) != 0) {
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DEBUG(1, ("invalid lock record length %d\n", (int)data.dsize));
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return false;
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}
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num_locks = data.dsize / sizeof(struct g_lock_rec);
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locks = talloc_array(mem_ctx, struct g_lock_rec, num_locks);
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if (locks == NULL) {
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DEBUG(1, ("talloc failed\n"));
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return false;
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}
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memcpy(locks, data.dptr, data.dsize);
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DEBUG(10, ("locks:\n"));
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for (i=0; i<num_locks; i++) {
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DEBUGADD(10, ("%s: %s %s\n",
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server_id_str(talloc_tos(), &locks[i].pid),
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((locks[i].lock_type & 1) == G_LOCK_READ) ?
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"read" : "write",
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(locks[i].lock_type & G_LOCK_PENDING) ?
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"(pending)" : "(owner)"));
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if (((locks[i].lock_type & G_LOCK_PENDING) == 0)
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&& !process_exists(locks[i].pid)) {
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DEBUGADD(10, ("lock owner %s died -- discarding\n",
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server_id_str(talloc_tos(),
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&locks[i].pid)));
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if (i < (num_locks-1)) {
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locks[i] = locks[num_locks-1];
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}
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num_locks -= 1;
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}
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}
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*plocks = locks;
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*pnum_locks = num_locks;
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return true;
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}
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static void g_lock_cleanup(int *pnum_locks, struct g_lock_rec *locks)
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{
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int i, num_locks;
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num_locks = *pnum_locks;
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DEBUG(10, ("g_lock_cleanup: %d locks\n", num_locks));
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for (i=0; i<num_locks; i++) {
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if (process_exists(locks[i].pid)) {
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continue;
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}
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DEBUGADD(10, ("%s does not exist -- discarding\n",
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server_id_str(talloc_tos(), &locks[i].pid)));
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if (i < (num_locks-1)) {
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locks[i] = locks[num_locks-1];
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}
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num_locks -= 1;
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}
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*pnum_locks = num_locks;
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return;
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}
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static struct g_lock_rec *g_lock_addrec(TALLOC_CTX *mem_ctx,
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struct g_lock_rec *locks,
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int *pnum_locks,
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const struct server_id pid,
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enum g_lock_type lock_type)
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{
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struct g_lock_rec *result;
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int num_locks = *pnum_locks;
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result = talloc_realloc(mem_ctx, locks, struct g_lock_rec,
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num_locks+1);
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if (result == NULL) {
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return NULL;
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}
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result[num_locks].pid = pid;
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result[num_locks].lock_type = lock_type;
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*pnum_locks += 1;
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return result;
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}
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static void g_lock_got_retry(struct messaging_context *msg,
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void *private_data,
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uint32_t msg_type,
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struct server_id server_id,
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DATA_BLOB *data);
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static NTSTATUS g_lock_trylock(struct g_lock_ctx *ctx, const char *name,
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enum g_lock_type lock_type)
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{
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struct db_record *rec = NULL;
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struct g_lock_rec *locks = NULL;
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int i, num_locks;
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struct server_id self;
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int our_index;
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TDB_DATA data;
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NTSTATUS status = NT_STATUS_OK;
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NTSTATUS store_status;
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TDB_DATA value;
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again:
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rec = dbwrap_fetch_locked(ctx->db, talloc_tos(),
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string_term_tdb_data(name));
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if (rec == NULL) {
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DEBUG(10, ("fetch_locked(\"%s\") failed\n", name));
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status = NT_STATUS_LOCK_NOT_GRANTED;
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goto done;
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}
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value = dbwrap_record_get_value(rec);
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if (!g_lock_parse(talloc_tos(), value, &num_locks, &locks)) {
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DEBUG(10, ("g_lock_parse for %s failed\n", name));
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status = NT_STATUS_INTERNAL_ERROR;
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goto done;
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}
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self = messaging_server_id(ctx->msg);
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our_index = -1;
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for (i=0; i<num_locks; i++) {
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if (procid_equal(&self, &locks[i].pid)) {
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if (our_index != -1) {
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DEBUG(1, ("g_lock_trylock: Added ourself "
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"twice!\n"));
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status = NT_STATUS_INTERNAL_ERROR;
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goto done;
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}
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if ((locks[i].lock_type & G_LOCK_PENDING) == 0) {
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DEBUG(1, ("g_lock_trylock: Found ourself not "
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"pending!\n"));
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status = NT_STATUS_INTERNAL_ERROR;
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goto done;
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}
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our_index = i;
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/* never conflict with ourself */
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continue;
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}
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if (g_lock_conflicts(lock_type, &locks[i])) {
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struct server_id pid = locks[i].pid;
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if (!process_exists(pid)) {
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TALLOC_FREE(locks);
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TALLOC_FREE(rec);
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status = g_lock_force_unlock(ctx, name, pid);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(1, ("Could not unlock dead lock "
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"holder!\n"));
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goto done;
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}
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goto again;
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}
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lock_type |= G_LOCK_PENDING;
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}
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}
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if (our_index == -1) {
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/* First round, add ourself */
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locks = g_lock_addrec(talloc_tos(), locks, &num_locks,
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self, lock_type);
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if (locks == NULL) {
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DEBUG(10, ("g_lock_addrec failed\n"));
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status = NT_STATUS_NO_MEMORY;
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goto done;
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}
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} else {
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/*
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* Retry. We were pending last time. Overwrite the
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* stored lock_type with what we calculated, we might
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* have acquired the lock this time.
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*/
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locks[our_index].lock_type = lock_type;
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}
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if (NT_STATUS_IS_OK(status) && ((lock_type & G_LOCK_PENDING) == 0)) {
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/*
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* Walk through the list of locks, search for dead entries
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*/
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g_lock_cleanup(&num_locks, locks);
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}
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data = make_tdb_data((uint8_t *)locks, num_locks * sizeof(*locks));
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store_status = dbwrap_record_store(rec, data, 0);
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if (!NT_STATUS_IS_OK(store_status)) {
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DEBUG(1, ("rec->store failed: %s\n",
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nt_errstr(store_status)));
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status = store_status;
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}
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done:
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TALLOC_FREE(locks);
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TALLOC_FREE(rec);
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if (NT_STATUS_IS_OK(status) && (lock_type & G_LOCK_PENDING) != 0) {
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return STATUS_PENDING;
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}
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return NT_STATUS_OK;
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}
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NTSTATUS g_lock_lock(struct g_lock_ctx *ctx, const char *name,
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enum g_lock_type lock_type, struct timeval timeout)
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{
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struct tevent_timer *te = NULL;
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NTSTATUS status;
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bool retry = false;
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struct timeval timeout_end;
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struct timeval time_now;
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DEBUG(10, ("Trying to acquire lock %d for %s\n", (int)lock_type,
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name));
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if (lock_type & ~1) {
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DEBUG(1, ("Got invalid lock type %d for %s\n",
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(int)lock_type, name));
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return NT_STATUS_INVALID_PARAMETER;
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}
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#ifdef CLUSTER_SUPPORT
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if (lp_clustering()) {
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status = ctdb_watch_us(messaging_ctdbd_connection());
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(10, ("could not register retry with ctdb: %s\n",
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nt_errstr(status)));
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goto done;
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}
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}
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#endif
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status = messaging_register(ctx->msg, &retry, MSG_DBWRAP_G_LOCK_RETRY,
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g_lock_got_retry);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(10, ("messaging_register failed: %s\n",
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nt_errstr(status)));
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return status;
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}
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time_now = timeval_current();
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timeout_end = timeval_sum(&time_now, &timeout);
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while (true) {
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struct pollfd *pollfds;
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int num_pollfds;
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int saved_errno;
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int ret;
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struct timeval timeout_remaining, select_timeout;
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status = g_lock_trylock(ctx, name, lock_type);
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if (NT_STATUS_IS_OK(status)) {
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DEBUG(10, ("Got lock %s\n", name));
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break;
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}
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if (!NT_STATUS_EQUAL(status, STATUS_PENDING)) {
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DEBUG(10, ("g_lock_trylock failed: %s\n",
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nt_errstr(status)));
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break;
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}
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DEBUG(10, ("g_lock_trylock: Did not get lock, waiting...\n"));
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/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* !!! HACK ALERT --- FIX ME !!!
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* What we really want to do here is to react to
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* MSG_DBWRAP_G_LOCK_RETRY messages that are either sent
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* by a client doing g_lock_unlock or by ourselves when
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* we receive a CTDB_SRVID_SAMBA_NOTIFY or
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* CTDB_SRVID_RECONFIGURE message from ctdbd, i.e. when
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* either a client holding a lock or a complete node
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* has died.
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*
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* Doing this properly involves calling tevent_loop_once(),
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* but doing this here with the main ctdbd messaging context
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* creates a nested event loop when g_lock_lock() is called
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* from the main event loop, e.g. in a tcon_and_X where the
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* share_info.tdb needs to be initialized and is locked by
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* another process, or when the remore registry is accessed
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* for writing and some other process already holds a lock
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* on the registry.tdb.
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*
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* So as a quick fix, we act a little coarsely here: we do
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* a select on the ctdb connection fd and when it is readable
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* or we get EINTR, then we retry without actually parsing
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* any ctdb packages or dispatching messages. This means that
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* we retry more often than intended by design, but this does
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* not harm and it is unobtrusive. When we have finished,
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* the main loop will pick up all the messages and ctdb
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* packets. The only extra twist is that we cannot use timed
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* events here but have to handcode a timeout.
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*/
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/*
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* We allocate 2 entries here. One is needed anyway for
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* sys_poll and in the clustering case we might have to add
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* the ctdb fd. This avoids the realloc then.
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*/
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pollfds = talloc_array(talloc_tos(), struct pollfd, 2);
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if (pollfds == NULL) {
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status = NT_STATUS_NO_MEMORY;
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break;
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}
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num_pollfds = 0;
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#ifdef CLUSTER_SUPPORT
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if (lp_clustering()) {
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struct ctdbd_connection *conn;
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conn = messaging_ctdbd_connection();
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pollfds[0].fd = ctdbd_conn_get_fd(conn);
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pollfds[0].events = POLLIN|POLLHUP;
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num_pollfds += 1;
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}
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#endif
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time_now = timeval_current();
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timeout_remaining = timeval_until(&time_now, &timeout_end);
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select_timeout = timeval_set(60, 0);
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select_timeout = timeval_min(&select_timeout,
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&timeout_remaining);
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ret = sys_poll(pollfds, num_pollfds,
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timeval_to_msec(select_timeout));
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/*
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* We're not *really interested in the actual flags. We just
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* need to retry this whole thing.
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*/
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saved_errno = errno;
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TALLOC_FREE(pollfds);
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errno = saved_errno;
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if (ret == -1) {
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if (errno != EINTR) {
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DEBUG(1, ("error calling select: %s\n",
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strerror(errno)));
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status = NT_STATUS_INTERNAL_ERROR;
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break;
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}
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/*
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* errno == EINTR:
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* This means a signal was received.
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* It might have been a MSG_DBWRAP_G_LOCK_RETRY message.
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* ==> retry
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*/
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} else if (ret == 0) {
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if (timeval_expired(&timeout_end)) {
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DEBUG(10, ("g_lock_lock timed out\n"));
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status = NT_STATUS_LOCK_NOT_GRANTED;
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break;
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} else {
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DEBUG(10, ("select returned 0 but timeout not "
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"not expired, retrying\n"));
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}
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} else if (ret != 1) {
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DEBUG(1, ("invalid return code of select: %d\n", ret));
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status = NT_STATUS_INTERNAL_ERROR;
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break;
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}
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/*
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* ret == 1:
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* This means ctdbd has sent us some data.
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* Might be a CTDB_SRVID_RECONFIGURE or a
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* CTDB_SRVID_SAMBA_NOTIFY message.
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* ==> retry
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*/
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}
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#ifdef CLUSTER_SUPPORT
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done:
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#endif
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if (!NT_STATUS_IS_OK(status)) {
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NTSTATUS unlock_status;
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unlock_status = g_lock_unlock(ctx, name);
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if (!NT_STATUS_IS_OK(unlock_status)) {
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DEBUG(1, ("Could not remove ourself from the locking "
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"db: %s\n", nt_errstr(status)));
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}
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}
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messaging_deregister(ctx->msg, MSG_DBWRAP_G_LOCK_RETRY, &retry);
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TALLOC_FREE(te);
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return status;
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}
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static void g_lock_got_retry(struct messaging_context *msg,
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void *private_data,
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uint32_t msg_type,
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struct server_id server_id,
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DATA_BLOB *data)
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{
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bool *pretry = (bool *)private_data;
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DEBUG(10, ("Got retry message from pid %s\n",
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server_id_str(talloc_tos(), &server_id)));
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*pretry = true;
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}
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static NTSTATUS g_lock_force_unlock(struct g_lock_ctx *ctx, const char *name,
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struct server_id pid)
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{
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struct db_record *rec = NULL;
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struct g_lock_rec *locks = NULL;
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int i, num_locks;
|
|
enum g_lock_type lock_type;
|
|
NTSTATUS status;
|
|
TDB_DATA value;
|
|
|
|
rec = dbwrap_fetch_locked(ctx->db, talloc_tos(),
|
|
string_term_tdb_data(name));
|
|
if (rec == NULL) {
|
|
DEBUG(10, ("fetch_locked(\"%s\") failed\n", name));
|
|
status = NT_STATUS_INTERNAL_ERROR;
|
|
goto done;
|
|
}
|
|
|
|
value = dbwrap_record_get_value(rec);
|
|
|
|
if (!g_lock_parse(talloc_tos(), value, &num_locks, &locks)) {
|
|
DEBUG(10, ("g_lock_parse for %s failed\n", name));
|
|
status = NT_STATUS_FILE_INVALID;
|
|
goto done;
|
|
}
|
|
|
|
for (i=0; i<num_locks; i++) {
|
|
if (procid_equal(&pid, &locks[i].pid)) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (i == num_locks) {
|
|
DEBUG(10, ("g_lock_force_unlock: Lock not found\n"));
|
|
status = NT_STATUS_NOT_FOUND;
|
|
goto done;
|
|
}
|
|
|
|
lock_type = locks[i].lock_type;
|
|
|
|
if (i < (num_locks-1)) {
|
|
locks[i] = locks[num_locks-1];
|
|
}
|
|
num_locks -= 1;
|
|
|
|
if (num_locks == 0) {
|
|
status = dbwrap_record_delete(rec);
|
|
} else {
|
|
TDB_DATA data;
|
|
data = make_tdb_data((uint8_t *)locks,
|
|
sizeof(struct g_lock_rec) * num_locks);
|
|
status = dbwrap_record_store(rec, data, 0);
|
|
}
|
|
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DEBUG(1, ("g_lock_force_unlock: Could not store record: %s\n",
|
|
nt_errstr(status)));
|
|
goto done;
|
|
}
|
|
|
|
TALLOC_FREE(rec);
|
|
|
|
if ((lock_type & G_LOCK_PENDING) == 0) {
|
|
int num_wakeups = 0;
|
|
|
|
/*
|
|
* We've been the lock holder. Others to retry. Don't
|
|
* tell all others to avoid a thundering herd. In case
|
|
* this leads to a complete stall because we miss some
|
|
* processes, the loop in g_lock_lock tries at least
|
|
* once a minute.
|
|
*/
|
|
|
|
for (i=0; i<num_locks; i++) {
|
|
if ((locks[i].lock_type & G_LOCK_PENDING) == 0) {
|
|
continue;
|
|
}
|
|
if (!process_exists(locks[i].pid)) {
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Ping all waiters to retry
|
|
*/
|
|
status = messaging_send(ctx->msg, locks[i].pid,
|
|
MSG_DBWRAP_G_LOCK_RETRY,
|
|
&data_blob_null);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DEBUG(1, ("sending retry to %s failed: %s\n",
|
|
server_id_str(talloc_tos(),
|
|
&locks[i].pid),
|
|
nt_errstr(status)));
|
|
} else {
|
|
num_wakeups += 1;
|
|
}
|
|
if (num_wakeups > 5) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
done:
|
|
/*
|
|
* For the error path, TALLOC_FREE(rec) as well. In the good
|
|
* path we have already freed it.
|
|
*/
|
|
TALLOC_FREE(rec);
|
|
|
|
TALLOC_FREE(locks);
|
|
return status;
|
|
}
|
|
|
|
NTSTATUS g_lock_unlock(struct g_lock_ctx *ctx, const char *name)
|
|
{
|
|
NTSTATUS status;
|
|
|
|
status = g_lock_force_unlock(ctx, name, messaging_server_id(ctx->msg));
|
|
|
|
#ifdef CLUSTER_SUPPORT
|
|
if (lp_clustering()) {
|
|
ctdb_unwatch(messaging_ctdbd_connection());
|
|
}
|
|
#endif
|
|
return status;
|
|
}
|
|
|
|
struct g_lock_locks_state {
|
|
int (*fn)(const char *name, void *private_data);
|
|
void *private_data;
|
|
};
|
|
|
|
static int g_lock_locks_fn(struct db_record *rec, void *priv)
|
|
{
|
|
TDB_DATA key;
|
|
struct g_lock_locks_state *state = (struct g_lock_locks_state *)priv;
|
|
|
|
key = dbwrap_record_get_key(rec);
|
|
if ((key.dsize == 0) || (key.dptr[key.dsize-1] != 0)) {
|
|
DEBUG(1, ("invalid key in g_lock.tdb, ignoring\n"));
|
|
return 0;
|
|
}
|
|
return state->fn((char *)key.dptr, state->private_data);
|
|
}
|
|
|
|
int g_lock_locks(struct g_lock_ctx *ctx,
|
|
int (*fn)(const char *name, void *private_data),
|
|
void *private_data)
|
|
{
|
|
struct g_lock_locks_state state;
|
|
NTSTATUS status;
|
|
int count;
|
|
|
|
state.fn = fn;
|
|
state.private_data = private_data;
|
|
|
|
status = dbwrap_traverse_read(ctx->db, g_lock_locks_fn, &state, &count);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
return -1;
|
|
} else {
|
|
return count;
|
|
}
|
|
}
|
|
|
|
NTSTATUS g_lock_dump(struct g_lock_ctx *ctx, const char *name,
|
|
int (*fn)(struct server_id pid,
|
|
enum g_lock_type lock_type,
|
|
void *private_data),
|
|
void *private_data)
|
|
{
|
|
TDB_DATA data;
|
|
int i, num_locks;
|
|
struct g_lock_rec *locks = NULL;
|
|
bool ret;
|
|
NTSTATUS status;
|
|
|
|
status = dbwrap_fetch_bystring(ctx->db, talloc_tos(), name, &data);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
return status;
|
|
}
|
|
|
|
if ((data.dsize == 0) || (data.dptr == NULL)) {
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
ret = g_lock_parse(talloc_tos(), data, &num_locks, &locks);
|
|
|
|
TALLOC_FREE(data.dptr);
|
|
|
|
if (!ret) {
|
|
DEBUG(10, ("g_lock_parse for %s failed\n", name));
|
|
return NT_STATUS_INTERNAL_ERROR;
|
|
}
|
|
|
|
for (i=0; i<num_locks; i++) {
|
|
if (fn(locks[i].pid, locks[i].lock_type, private_data) != 0) {
|
|
break;
|
|
}
|
|
}
|
|
TALLOC_FREE(locks);
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
struct g_lock_get_state {
|
|
bool found;
|
|
struct server_id *pid;
|
|
};
|
|
|
|
static int g_lock_get_fn(struct server_id pid, enum g_lock_type lock_type,
|
|
void *priv)
|
|
{
|
|
struct g_lock_get_state *state = (struct g_lock_get_state *)priv;
|
|
|
|
if ((lock_type & G_LOCK_PENDING) != 0) {
|
|
return 0;
|
|
}
|
|
|
|
state->found = true;
|
|
*state->pid = pid;
|
|
return 1;
|
|
}
|
|
|
|
NTSTATUS g_lock_get(struct g_lock_ctx *ctx, const char *name,
|
|
struct server_id *pid)
|
|
{
|
|
struct g_lock_get_state state;
|
|
NTSTATUS status;
|
|
|
|
state.found = false;
|
|
state.pid = pid;
|
|
|
|
status = g_lock_dump(ctx, name, g_lock_get_fn, &state);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
return status;
|
|
}
|
|
if (!state.found) {
|
|
return NT_STATUS_NOT_FOUND;
|
|
}
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
static bool g_lock_init_all(TALLOC_CTX *mem_ctx,
|
|
struct tevent_context **pev,
|
|
struct messaging_context **pmsg,
|
|
struct g_lock_ctx **pg_ctx)
|
|
{
|
|
struct tevent_context *ev = NULL;
|
|
struct messaging_context *msg = NULL;
|
|
struct g_lock_ctx *g_ctx = NULL;
|
|
|
|
ev = tevent_context_init(mem_ctx);
|
|
if (ev == NULL) {
|
|
d_fprintf(stderr, "ERROR: could not init event context\n");
|
|
goto fail;
|
|
}
|
|
msg = messaging_init(mem_ctx, ev);
|
|
if (msg == NULL) {
|
|
d_fprintf(stderr, "ERROR: could not init messaging context\n");
|
|
goto fail;
|
|
}
|
|
g_ctx = g_lock_ctx_init(mem_ctx, msg);
|
|
if (g_ctx == NULL) {
|
|
d_fprintf(stderr, "ERROR: could not init g_lock context\n");
|
|
goto fail;
|
|
}
|
|
|
|
*pev = ev;
|
|
*pmsg = msg;
|
|
*pg_ctx = g_ctx;
|
|
return true;
|
|
fail:
|
|
TALLOC_FREE(g_ctx);
|
|
TALLOC_FREE(msg);
|
|
TALLOC_FREE(ev);
|
|
return false;
|
|
}
|
|
|
|
NTSTATUS g_lock_do(const char *name, enum g_lock_type lock_type,
|
|
struct timeval timeout,
|
|
void (*fn)(void *private_data), void *private_data)
|
|
{
|
|
struct tevent_context *ev = NULL;
|
|
struct messaging_context *msg = NULL;
|
|
struct g_lock_ctx *g_ctx = NULL;
|
|
NTSTATUS status;
|
|
|
|
if (!g_lock_init_all(talloc_tos(), &ev, &msg, &g_ctx)) {
|
|
status = NT_STATUS_ACCESS_DENIED;
|
|
goto done;
|
|
}
|
|
|
|
status = g_lock_lock(g_ctx, name, lock_type, timeout);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
goto done;
|
|
}
|
|
fn(private_data);
|
|
g_lock_unlock(g_ctx, name);
|
|
|
|
done:
|
|
TALLOC_FREE(g_ctx);
|
|
TALLOC_FREE(msg);
|
|
TALLOC_FREE(ev);
|
|
return status;
|
|
}
|