--- /dev/null
+#include "../common/tdb_private.h"
+#include "../common/io.c"
+#include "../common/tdb.c"
+#include "../common/lock.c"
+#include "../common/freelist.c"
+#include "../common/traverse.c"
+#include "../common/transaction.c"
+#include "../common/error.c"
+#include "../common/open.c"
+#include "../common/check.c"
+#include "../common/hash.c"
+#include "../common/mutex.c"
+#include "tap-interface.h"
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <stdarg.h>
+#include "logging.h"
+
+static TDB_DATA key, data;
+
+static void do_chainlock(const char *name, int tdb_flags, int up, int down)
+{
+ struct tdb_context *tdb;
+ int ret;
+ ssize_t nread, nwritten;
+ char c = 0;
+
+ tdb = tdb_open_ex(name, 3, tdb_flags,
+ O_RDWR|O_CREAT, 0755, &taplogctx, NULL);
+ ok(tdb, "tdb_open_ex should succeed");
+
+ ret = tdb_chainlock(tdb, key);
+ ok(ret == 0, "tdb_chainlock should succeed");
+
+ nwritten = write(up, &c, sizeof(c));
+ ok(nwritten == sizeof(c), "write should succeed");
+
+ nread = read(down, &c, sizeof(c));
+ ok(nread == sizeof(c), "read should succeed");
+
+ exit(0);
+}
+
+static void do_allrecord_lock(const char *name, int tdb_flags, int up, int down)
+{
+ struct tdb_context *tdb;
+ int ret;
+ ssize_t nread, nwritten;
+ char c = 0;
+
+ tdb = tdb_open_ex(name, 3, tdb_flags,
+ O_RDWR|O_CREAT, 0755, &taplogctx, NULL);
+ ok(tdb, "tdb_open_ex should succeed");
+
+ ret = tdb_allrecord_lock(tdb, F_WRLCK, TDB_LOCK_WAIT, false);
+ ok(ret == 0, "tdb_allrecord_lock should succeed");
+
+ nwritten = write(up, &c, sizeof(c));
+ ok(nwritten == sizeof(c), "write should succeed");
+
+ nread = read(down, &c, sizeof(c));
+ ok(nread == sizeof(c), "read should succeed");
+
+ exit(0);
+}
+
+/* The code should barf on TDBs created with rwlocks. */
+static int do_tests(const char *name, int tdb_flags)
+{
+ struct tdb_context *tdb;
+ int ret;
+ pid_t chainlock_child, allrecord_child;
+ int chainlock_down[2];
+ int chainlock_up[2];
+ int allrecord_down[2];
+ int allrecord_up[2];
+ char c;
+ ssize_t nread, nwritten;
+
+ key.dsize = strlen("hi");
+ key.dptr = discard_const_p(uint8_t, "hi");
+ data.dsize = strlen("world");
+ data.dptr = discard_const_p(uint8_t, "world");
+
+ ret = pipe(chainlock_down);
+ ok(ret == 0, "pipe should succeed");
+
+ ret = pipe(chainlock_up);
+ ok(ret == 0, "pipe should succeed");
+
+ ret = pipe(allrecord_down);
+ ok(ret == 0, "pipe should succeed");
+
+ ret = pipe(allrecord_up);
+ ok(ret == 0, "pipe should succeed");
+
+ chainlock_child = fork();
+ ok(chainlock_child != -1, "fork should succeed");
+
+ if (chainlock_child == 0) {
+ close(chainlock_up[0]);
+ close(chainlock_down[1]);
+ close(allrecord_up[0]);
+ close(allrecord_up[1]);
+ close(allrecord_down[0]);
+ close(allrecord_down[1]);
+ do_chainlock(name, tdb_flags,
+ chainlock_up[1], chainlock_down[0]);
+ exit(0);
+ }
+ close(chainlock_up[1]);
+ close(chainlock_down[0]);
+
+ nread = read(chainlock_up[0], &c, sizeof(c));
+ ok(nread == sizeof(c), "read should succeed");
+
+ /*
+ * Now we have a process holding a chainlock. Start another process
+ * trying the allrecord lock. This will block.
+ */
+
+ allrecord_child = fork();
+ ok(allrecord_child != -1, "fork should succeed");
+
+ if (allrecord_child == 0) {
+ close(chainlock_up[0]);
+ close(chainlock_up[1]);
+ close(chainlock_down[0]);
+ close(chainlock_down[1]);
+ close(allrecord_up[0]);
+ close(allrecord_down[1]);
+ do_allrecord_lock(name, tdb_flags,
+ allrecord_up[1], allrecord_down[0]);
+ exit(0);
+ }
+ close(allrecord_up[1]);
+ close(allrecord_down[0]);
+
+ poll(NULL, 0, 500);
+
+ tdb = tdb_open_ex(name, 3, tdb_flags,
+ O_RDWR|O_CREAT, 0755, &taplogctx, NULL);
+ ok(tdb, "tdb_open_ex should succeed");
+
+ /*
+ * Someone already holds a chainlock, but we're able to get the
+ * freelist lock.
+ *
+ * The freelist lock/mutex is independent from the allrecord lock/mutex.
+ */
+
+ ret = tdb_chainlock_nonblock(tdb, key);
+ ok(ret == -1, "tdb_chainlock_nonblock should not succeed");
+
+ ret = tdb_lock_nonblock(tdb, -1, F_WRLCK);
+ ok(ret == 0, "tdb_lock_nonblock should succeed");
+
+ ret = tdb_unlock(tdb, -1, F_WRLCK);
+ ok(ret == 0, "tdb_unlock should succeed");
+
+ /*
+ * We have someone else having done the lock for us. Just mark it.
+ */
+
+ ret = tdb_chainlock_mark(tdb, key);
+ ok(ret == 0, "tdb_chainlock_mark should succeed");
+
+ /*
+ * The tdb_store below will block the freelist. In one version of the
+ * mutex patches, the freelist was already blocked here by the
+ * allrecord child, which was waiting for the chainlock child to give
+ * up its chainlock. Make sure that we don't run into this
+ * deadlock. To excercise the deadlock, just comment out the "ok"
+ * line.
+ *
+ * The freelist lock/mutex is independent from the allrecord lock/mutex.
+ */
+
+ ret = tdb_lock_nonblock(tdb, -1, F_WRLCK);
+ ok(ret == 0, "tdb_lock_nonblock should succeed");
+
+ ret = tdb_unlock(tdb, -1, F_WRLCK);
+ ok(ret == 0, "tdb_unlock should succeed");
+
+ ret = tdb_store(tdb, key, data, TDB_INSERT);
+ ok(ret == 0, "tdb_store should succeed");
+
+ ret = tdb_chainlock_unmark(tdb, key);
+ ok(ret == 0, "tdb_chainlock_unmark should succeed");
+
+ nwritten = write(chainlock_down[1], &c, sizeof(c));
+ ok(nwritten == sizeof(c), "write should succeed");
+
+ nread = read(chainlock_up[0], &c, sizeof(c));
+ ok(nread == 0, "read should succeed");
+
+ nread = read(allrecord_up[0], &c, sizeof(c));
+ ok(nread == sizeof(c), "read should succeed");
+
+ /*
+ * Someone already holds the allrecord lock, but we're able to get the
+ * freelist lock.
+ *
+ * The freelist lock/mutex is independent from the allrecord lock/mutex.
+ */
+
+ ret = tdb_chainlock_nonblock(tdb, key);
+ ok(ret == -1, "tdb_chainlock_nonblock should not succeed");
+
+ ret = tdb_lockall_nonblock(tdb);
+ ok(ret == -1, "tdb_lockall_nonblock should not succeed");
+
+ ret = tdb_lock_nonblock(tdb, -1, F_WRLCK);
+ ok(ret == 0, "tdb_lock_nonblock should succeed");
+
+ ret = tdb_unlock(tdb, -1, F_WRLCK);
+ ok(ret == 0, "tdb_unlock should succeed");
+
+ /*
+ * We have someone else having done the lock for us. Just mark it.
+ */
+
+ ret = tdb_lockall_mark(tdb);
+ ok(ret == 0, "tdb_lockall_mark should succeed");
+
+ ret = tdb_lock_nonblock(tdb, -1, F_WRLCK);
+ ok(ret == 0, "tdb_lock_nonblock should succeed");
+
+ ret = tdb_unlock(tdb, -1, F_WRLCK);
+ ok(ret == 0, "tdb_unlock should succeed");
+
+ ret = tdb_store(tdb, key, data, TDB_REPLACE);
+ ok(ret == 0, "tdb_store should succeed");
+
+ ret = tdb_lockall_unmark(tdb);
+ ok(ret == 0, "tdb_lockall_unmark should succeed");
+
+ nwritten = write(allrecord_down[1], &c, sizeof(c));
+ ok(nwritten == sizeof(c), "write should succeed");
+
+ nread = read(allrecord_up[0], &c, sizeof(c));
+ ok(nread == 0, "read should succeed");
+
+ close(chainlock_up[0]);
+ close(chainlock_down[1]);
+ close(allrecord_up[0]);
+ close(allrecord_down[1]);
+ diag("%s tests done", name);
+ return exit_status();
+}
+
+int main(int argc, char *argv[])
+{
+ int ret;
+ bool mutex_support;
+
+ mutex_support = tdb_runtime_check_for_robust_mutexes();
+
+ ret = do_tests("marklock-deadlock-fcntl.tdb",
+ TDB_CLEAR_IF_FIRST |
+ TDB_INCOMPATIBLE_HASH);
+ ok(ret == 0, "marklock-deadlock-fcntl.tdb tests should succeed");
+
+ if (!mutex_support) {
+ skip(1, "No robust mutex support, "
+ "skipping marklock-deadlock-mutex.tdb tests");
+ return exit_status();
+ }
+
+ ret = do_tests("marklock-deadlock-mutex.tdb",
+ TDB_CLEAR_IF_FIRST |
+ TDB_MUTEX_LOCKING |
+ TDB_INCOMPATIBLE_HASH);
+ ok(ret == 0, "marklock-deadlock-mutex.tdb tests should succeed");
+
+ return exit_status();
+}
git.samba.org / samba.git / commitdiff