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-rw-r--r--src/test/libcephfs/flock.cc645
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diff --git a/src/test/libcephfs/flock.cc b/src/test/libcephfs/flock.cc
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+++ b/src/test/libcephfs/flock.cc
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2011 New Dream Network
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation. See file COPYING.
+ *
+ */
+
+#include <pthread.h>
+#include "gtest/gtest.h"
+#ifndef GTEST_IS_THREADSAFE
+#error "!GTEST_IS_THREADSAFE"
+#endif
+
+#include "include/cephfs/libcephfs.h"
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/file.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <dirent.h>
+#include <stdlib.h>
+#include <semaphore.h>
+#include <time.h>
+#include <sys/mman.h>
+
+#ifdef __linux__
+#include <limits.h>
+#include <sys/xattr.h>
+#elif __FreeBSD__
+#include <sys/types.h>
+#include <sys/wait.h>
+#endif
+
+#include "include/ceph_assert.h"
+#include "ceph_pthread_self.h"
+
+// Startup common: create and mount ceph fs
+#define STARTUP_CEPH() do { \
+ ASSERT_EQ(0, ceph_create(&cmount, NULL)); \
+ ASSERT_EQ(0, ceph_conf_read_file(cmount, NULL)); \
+ ASSERT_EQ(0, ceph_conf_parse_env(cmount, NULL)); \
+ ASSERT_EQ(0, ceph_mount(cmount, NULL)); \
+ } while(0)
+
+// Cleanup common: unmount and release ceph fs
+#define CLEANUP_CEPH() do { \
+ ASSERT_EQ(0, ceph_unmount(cmount)); \
+ ASSERT_EQ(0, ceph_release(cmount)); \
+ } while(0)
+
+static const mode_t fileMode = S_IRWXU | S_IRWXG | S_IRWXO;
+
+// Default wait time for normal and "slow" operations
+// (5" should be enough in case of network congestion)
+static const long waitMs = 10;
+static const long waitSlowMs = 5000;
+
+// Get the absolute struct timespec reference from now + 'ms' milliseconds
+static const struct timespec* abstime(struct timespec &ts, long ms) {
+ if (clock_gettime(CLOCK_REALTIME, &ts) == -1) {
+ ceph_abort();
+ }
+ ts.tv_nsec += ms * 1000000;
+ ts.tv_sec += ts.tv_nsec / 1000000000;
+ ts.tv_nsec %= 1000000000;
+ return &ts;
+}
+
+/* Basic locking */
+TEST(LibCephFS, BasicLocking) {
+ struct ceph_mount_info *cmount = NULL;
+ STARTUP_CEPH();
+
+ char c_file[1024];
+ sprintf(c_file, "/flock_test_%d", getpid());
+ const int fd = ceph_open(cmount, c_file, O_RDWR | O_CREAT, fileMode);
+ ASSERT_GE(fd, 0);
+
+ // Lock exclusively twice
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX, 42));
+ ASSERT_EQ(-EWOULDBLOCK, ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, 43));
+ ASSERT_EQ(-EWOULDBLOCK, ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, 44));
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, 42));
+
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, 43));
+ ASSERT_EQ(-EWOULDBLOCK, ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, 44));
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, 43));
+
+ // Lock shared three times
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_SH, 42));
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_SH, 43));
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_SH, 44));
+ // And then attempt to lock exclusively
+ ASSERT_EQ(-EWOULDBLOCK, ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, 45));
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, 42));
+ ASSERT_EQ(-EWOULDBLOCK, ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, 45));
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, 44));
+ ASSERT_EQ(-EWOULDBLOCK, ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, 45));
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, 43));
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, 45));
+ ASSERT_EQ(-EWOULDBLOCK, ceph_flock(cmount, fd, LOCK_SH | LOCK_NB, 42));
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, 45));
+
+ // Lock shared with upgrade to exclusive (POSIX)
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_SH, 42));
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX, 42));
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, 42));
+
+ // Lock exclusive with downgrade to shared (POSIX)
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX, 42));
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_SH, 42));
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, 42));
+
+ ASSERT_EQ(0, ceph_close(cmount, fd));
+ ASSERT_EQ(0, ceph_unlink(cmount, c_file));
+ CLEANUP_CEPH();
+}
+
+/* Locking in different threads */
+
+// Used by ConcurrentLocking test
+struct str_ConcurrentLocking {
+ const char *file;
+ struct ceph_mount_info *cmount; // !NULL if shared
+ sem_t sem[2];
+ sem_t semReply[2];
+ void sem_init(int pshared) {
+ ASSERT_EQ(0, ::sem_init(&sem[0], pshared, 0));
+ ASSERT_EQ(0, ::sem_init(&sem[1], pshared, 0));
+ ASSERT_EQ(0, ::sem_init(&semReply[0], pshared, 0));
+ ASSERT_EQ(0, ::sem_init(&semReply[1], pshared, 0));
+ }
+ void sem_destroy() {
+ ASSERT_EQ(0, ::sem_destroy(&sem[0]));
+ ASSERT_EQ(0, ::sem_destroy(&sem[1]));
+ ASSERT_EQ(0, ::sem_destroy(&semReply[0]));
+ ASSERT_EQ(0, ::sem_destroy(&semReply[1]));
+ }
+};
+
+// Wakeup main (for (N) steps)
+#define PING_MAIN(n) ASSERT_EQ(0, sem_post(&s.sem[n%2]))
+// Wait for main to wake us up (for (RN) steps)
+#define WAIT_MAIN(n) \
+ ASSERT_EQ(0, sem_timedwait(&s.semReply[n%2], abstime(ts, waitSlowMs)))
+
+// Wakeup worker (for (RN) steps)
+#define PING_WORKER(n) ASSERT_EQ(0, sem_post(&s.semReply[n%2]))
+// Wait for worker to wake us up (for (N) steps)
+#define WAIT_WORKER(n) \
+ ASSERT_EQ(0, sem_timedwait(&s.sem[n%2], abstime(ts, waitSlowMs)))
+// Worker shall not wake us up (for (N) steps)
+#define NOT_WAIT_WORKER(n) \
+ ASSERT_EQ(-1, sem_timedwait(&s.sem[n%2], abstime(ts, waitMs)))
+
+// Do twice an operation
+#define TWICE(EXPR) do { \
+ EXPR; \
+ EXPR; \
+ } while(0)
+
+/* Locking in different threads */
+
+// Used by ConcurrentLocking test
+static void thread_ConcurrentLocking(str_ConcurrentLocking& s) {
+ struct ceph_mount_info *const cmount = s.cmount;
+ struct timespec ts;
+
+ const int fd = ceph_open(cmount, s.file, O_RDWR | O_CREAT, fileMode);
+ ASSERT_GE(fd, 0);
+
+ ASSERT_EQ(-EWOULDBLOCK,
+ ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, ceph_pthread_self()));
+ PING_MAIN(1); // (1)
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX, ceph_pthread_self()));
+ PING_MAIN(2); // (2)
+
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, ceph_pthread_self()));
+ PING_MAIN(3); // (3)
+
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_SH, ceph_pthread_self()));
+ PING_MAIN(4); // (4)
+
+ WAIT_MAIN(1); // (R1)
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, ceph_pthread_self()));
+ PING_MAIN(5); // (5)
+
+ WAIT_MAIN(2); // (R2)
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX, ceph_pthread_self()));
+ PING_MAIN(6); // (6)
+
+ WAIT_MAIN(3); // (R3)
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, ceph_pthread_self()));
+ PING_MAIN(7); // (7)
+}
+
+// Used by ConcurrentLocking test
+static void* thread_ConcurrentLocking_(void *arg) {
+ str_ConcurrentLocking *const s =
+ reinterpret_cast<str_ConcurrentLocking*>(arg);
+ thread_ConcurrentLocking(*s);
+ return NULL;
+}
+
+TEST(LibCephFS, ConcurrentLocking) {
+ const pid_t mypid = getpid();
+ struct ceph_mount_info *cmount;
+ STARTUP_CEPH();
+
+ char c_file[1024];
+ sprintf(c_file, "/flock_test_%d", mypid);
+ const int fd = ceph_open(cmount, c_file, O_RDWR | O_CREAT, fileMode);
+ ASSERT_GE(fd, 0);
+
+ // Lock
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX, ceph_pthread_self()));
+
+ // Start locker thread
+ pthread_t thread;
+ struct timespec ts;
+ str_ConcurrentLocking s = { c_file, cmount };
+ s.sem_init(0);
+ ASSERT_EQ(0, pthread_create(&thread, NULL, thread_ConcurrentLocking_, &s));
+ // Synchronization point with thread (failure: thread is dead)
+ WAIT_WORKER(1); // (1)
+
+ // Shall not have lock immediately
+ NOT_WAIT_WORKER(2); // (2)
+
+ // Unlock
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, ceph_pthread_self()));
+
+ // Shall have lock
+ // Synchronization point with thread (failure: thread is dead)
+ WAIT_WORKER(2); // (2)
+
+ // Synchronization point with thread (failure: thread is dead)
+ WAIT_WORKER(3); // (3)
+
+ // Wait for thread to share lock
+ WAIT_WORKER(4); // (4)
+ ASSERT_EQ(-EWOULDBLOCK,
+ ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, ceph_pthread_self()));
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_SH | LOCK_NB, ceph_pthread_self()));
+
+ // Wake up thread to unlock shared lock
+ PING_WORKER(1); // (R1)
+ WAIT_WORKER(5); // (5)
+
+ // Now we can lock exclusively
+ // Upgrade to exclusive lock (as per POSIX)
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX, ceph_pthread_self()));
+
+ // Wake up thread to lock shared lock
+ PING_WORKER(2); // (R2)
+
+ // Shall not have lock immediately
+ NOT_WAIT_WORKER(6); // (6)
+
+ // Release lock ; thread will get it
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, ceph_pthread_self()));
+ WAIT_WORKER(6); // (6)
+
+ // We no longer have the lock
+ ASSERT_EQ(-EWOULDBLOCK,
+ ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, ceph_pthread_self()));
+ ASSERT_EQ(-EWOULDBLOCK,
+ ceph_flock(cmount, fd, LOCK_SH | LOCK_NB, ceph_pthread_self()));
+
+ // Wake up thread to unlock exclusive lock
+ PING_WORKER(3); // (R3)
+ WAIT_WORKER(7); // (7)
+
+ // We can lock it again
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, ceph_pthread_self()));
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, ceph_pthread_self()));
+
+ // Cleanup
+ void *retval = (void*) (uintptr_t) -1;
+ ASSERT_EQ(0, pthread_join(thread, &retval));
+ ASSERT_EQ(NULL, retval);
+ s.sem_destroy();
+ ASSERT_EQ(0, ceph_close(cmount, fd));
+ ASSERT_EQ(0, ceph_unlink(cmount, c_file));
+ CLEANUP_CEPH();
+}
+
+TEST(LibCephFS, ThreesomeLocking) {
+ const pid_t mypid = getpid();
+ struct ceph_mount_info *cmount;
+ STARTUP_CEPH();
+
+ char c_file[1024];
+ sprintf(c_file, "/flock_test_%d", mypid);
+ const int fd = ceph_open(cmount, c_file, O_RDWR | O_CREAT, fileMode);
+ ASSERT_GE(fd, 0);
+
+ // Lock
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX, ceph_pthread_self()));
+
+ // Start locker thread
+ pthread_t thread[2];
+ struct timespec ts;
+ str_ConcurrentLocking s = { c_file, cmount };
+ s.sem_init(0);
+ ASSERT_EQ(0, pthread_create(&thread[0], NULL, thread_ConcurrentLocking_, &s));
+ ASSERT_EQ(0, pthread_create(&thread[1], NULL, thread_ConcurrentLocking_, &s));
+ // Synchronization point with thread (failure: thread is dead)
+ TWICE(WAIT_WORKER(1)); // (1)
+
+ // Shall not have lock immediately
+ NOT_WAIT_WORKER(2); // (2)
+
+ // Unlock
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, ceph_pthread_self()));
+
+ // Shall have lock
+ TWICE(// Synchronization point with thread (failure: thread is dead)
+ WAIT_WORKER(2); // (2)
+
+ // Synchronization point with thread (failure: thread is dead)
+ WAIT_WORKER(3)); // (3)
+
+ // Wait for thread to share lock
+ TWICE(WAIT_WORKER(4)); // (4)
+ ASSERT_EQ(-EWOULDBLOCK,
+ ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, ceph_pthread_self()));
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_SH | LOCK_NB, ceph_pthread_self()));
+
+ // Wake up thread to unlock shared lock
+ TWICE(PING_WORKER(1); // (R1)
+ WAIT_WORKER(5)); // (5)
+
+ // Now we can lock exclusively
+ // Upgrade to exclusive lock (as per POSIX)
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX, ceph_pthread_self()));
+
+ TWICE( // Wake up thread to lock shared lock
+ PING_WORKER(2); // (R2)
+
+ // Shall not have lock immediately
+ NOT_WAIT_WORKER(6)); // (6)
+
+ // Release lock ; thread will get it
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, ceph_pthread_self()));
+ TWICE(WAIT_WORKER(6); // (6)
+
+ // We no longer have the lock
+ ASSERT_EQ(-EWOULDBLOCK,
+ ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, ceph_pthread_self()));
+ ASSERT_EQ(-EWOULDBLOCK,
+ ceph_flock(cmount, fd, LOCK_SH | LOCK_NB, ceph_pthread_self()));
+
+ // Wake up thread to unlock exclusive lock
+ PING_WORKER(3); // (R3)
+ WAIT_WORKER(7); // (7)
+ );
+
+ // We can lock it again
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, ceph_pthread_self()));
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, ceph_pthread_self()));
+
+ // Cleanup
+ void *retval = (void*) (uintptr_t) -1;
+ ASSERT_EQ(0, pthread_join(thread[0], &retval));
+ ASSERT_EQ(NULL, retval);
+ ASSERT_EQ(0, pthread_join(thread[1], &retval));
+ ASSERT_EQ(NULL, retval);
+ s.sem_destroy();
+ ASSERT_EQ(0, ceph_close(cmount, fd));
+ ASSERT_EQ(0, ceph_unlink(cmount, c_file));
+ CLEANUP_CEPH();
+}
+
+/* Locking in different processes */
+
+#define PROCESS_SLOW_MS() \
+ static const long waitMs = 100; \
+ (void) waitMs
+
+// Used by ConcurrentLocking test
+static void process_ConcurrentLocking(str_ConcurrentLocking& s) {
+ const pid_t mypid = getpid();
+ PROCESS_SLOW_MS();
+
+ struct ceph_mount_info *cmount = NULL;
+ struct timespec ts;
+
+ STARTUP_CEPH();
+ s.cmount = cmount;
+
+ const int fd = ceph_open(cmount, s.file, O_RDWR | O_CREAT, fileMode);
+ ASSERT_GE(fd, 0);
+ WAIT_MAIN(1); // (R1)
+
+ ASSERT_EQ(-EWOULDBLOCK,
+ ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, mypid));
+ PING_MAIN(1); // (1)
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX, mypid));
+ PING_MAIN(2); // (2)
+
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, mypid));
+ PING_MAIN(3); // (3)
+
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_SH, mypid));
+ PING_MAIN(4); // (4)
+
+ WAIT_MAIN(2); // (R2)
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, mypid));
+ PING_MAIN(5); // (5)
+
+ WAIT_MAIN(3); // (R3)
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX, mypid));
+ PING_MAIN(6); // (6)
+
+ WAIT_MAIN(4); // (R4)
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, mypid));
+ PING_MAIN(7); // (7)
+
+ CLEANUP_CEPH();
+
+ s.sem_destroy();
+ exit(EXIT_SUCCESS);
+}
+
+// Disabled because of fork() issues (http://tracker.ceph.com/issues/16556)
+TEST(LibCephFS, DISABLED_InterProcessLocking) {
+ PROCESS_SLOW_MS();
+ // Process synchronization
+ char c_file[1024];
+ const pid_t mypid = getpid();
+ sprintf(c_file, "/flock_test_%d", mypid);
+
+ // Note: the semaphores MUST be on a shared memory segment
+ str_ConcurrentLocking *const shs =
+ reinterpret_cast<str_ConcurrentLocking*>
+ (mmap(0, sizeof(*shs), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS,
+ -1, 0));
+ str_ConcurrentLocking &s = *shs;
+ s.file = c_file;
+ s.sem_init(1);
+
+ // Start locker process
+ const pid_t pid = fork();
+ ASSERT_GE(pid, 0);
+ if (pid == 0) {
+ process_ConcurrentLocking(s);
+ exit(EXIT_FAILURE);
+ }
+
+ struct timespec ts;
+ struct ceph_mount_info *cmount;
+ STARTUP_CEPH();
+
+ const int fd = ceph_open(cmount, c_file, O_RDWR | O_CREAT, fileMode);
+ ASSERT_GE(fd, 0);
+
+ // Lock
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX, mypid));
+
+ // Synchronization point with process (failure: process is dead)
+ PING_WORKER(1); // (R1)
+ WAIT_WORKER(1); // (1)
+
+ // Shall not have lock immediately
+ NOT_WAIT_WORKER(2); // (2)
+
+ // Unlock
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, mypid));
+
+ // Shall have lock
+ // Synchronization point with process (failure: process is dead)
+ WAIT_WORKER(2); // (2)
+
+ // Synchronization point with process (failure: process is dead)
+ WAIT_WORKER(3); // (3)
+
+ // Wait for process to share lock
+ WAIT_WORKER(4); // (4)
+ ASSERT_EQ(-EWOULDBLOCK, ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, mypid));
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_SH | LOCK_NB, mypid));
+
+ // Wake up process to unlock shared lock
+ PING_WORKER(2); // (R2)
+ WAIT_WORKER(5); // (5)
+
+ // Now we can lock exclusively
+ // Upgrade to exclusive lock (as per POSIX)
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX, mypid));
+
+ // Wake up process to lock shared lock
+ PING_WORKER(3); // (R3)
+
+ // Shall not have lock immediately
+ NOT_WAIT_WORKER(6); // (6)
+
+ // Release lock ; process will get it
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, mypid));
+ WAIT_WORKER(6); // (6)
+
+ // We no longer have the lock
+ ASSERT_EQ(-EWOULDBLOCK, ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, mypid));
+ ASSERT_EQ(-EWOULDBLOCK, ceph_flock(cmount, fd, LOCK_SH | LOCK_NB, mypid));
+
+ // Wake up process to unlock exclusive lock
+ PING_WORKER(4); // (R4)
+ WAIT_WORKER(7); // (7)
+
+ // We can lock it again
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, mypid));
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, mypid));
+
+ // Wait pid
+ int status;
+ ASSERT_EQ(pid, waitpid(pid, &status, 0));
+ ASSERT_EQ(EXIT_SUCCESS, status);
+
+ // Cleanup
+ s.sem_destroy();
+ ASSERT_EQ(0, munmap(shs, sizeof(*shs)));
+ ASSERT_EQ(0, ceph_close(cmount, fd));
+ ASSERT_EQ(0, ceph_unlink(cmount, c_file));
+ CLEANUP_CEPH();
+}
+
+// Disabled because of fork() issues (http://tracker.ceph.com/issues/16556)
+TEST(LibCephFS, DISABLED_ThreesomeInterProcessLocking) {
+ PROCESS_SLOW_MS();
+ // Process synchronization
+ char c_file[1024];
+ const pid_t mypid = getpid();
+ sprintf(c_file, "/flock_test_%d", mypid);
+
+ // Note: the semaphores MUST be on a shared memory segment
+ str_ConcurrentLocking *const shs =
+ reinterpret_cast<str_ConcurrentLocking*>
+ (mmap(0, sizeof(*shs), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS,
+ -1, 0));
+ str_ConcurrentLocking &s = *shs;
+ s.file = c_file;
+ s.sem_init(1);
+
+ // Start locker processes
+ pid_t pid[2];
+ pid[0] = fork();
+ ASSERT_GE(pid[0], 0);
+ if (pid[0] == 0) {
+ process_ConcurrentLocking(s);
+ exit(EXIT_FAILURE);
+ }
+ pid[1] = fork();
+ ASSERT_GE(pid[1], 0);
+ if (pid[1] == 0) {
+ process_ConcurrentLocking(s);
+ exit(EXIT_FAILURE);
+ }
+
+ struct timespec ts;
+ struct ceph_mount_info *cmount;
+ STARTUP_CEPH();
+
+ const int fd = ceph_open(cmount, c_file, O_RDWR | O_CREAT, fileMode);
+ ASSERT_GE(fd, 0);
+
+ // Lock
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX, mypid));
+
+ // Synchronization point with process (failure: process is dead)
+ TWICE(PING_WORKER(1)); // (R1)
+ TWICE(WAIT_WORKER(1)); // (1)
+
+ // Shall not have lock immediately
+ NOT_WAIT_WORKER(2); // (2)
+
+ // Unlock
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, mypid));
+
+ // Shall have lock
+ TWICE(// Synchronization point with process (failure: process is dead)
+ WAIT_WORKER(2); // (2)
+
+ // Synchronization point with process (failure: process is dead)
+ WAIT_WORKER(3)); // (3)
+
+ // Wait for process to share lock
+ TWICE(WAIT_WORKER(4)); // (4)
+ ASSERT_EQ(-EWOULDBLOCK,
+ ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, mypid));
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_SH | LOCK_NB, mypid));
+
+ // Wake up process to unlock shared lock
+ TWICE(PING_WORKER(2); // (R2)
+ WAIT_WORKER(5)); // (5)
+
+ // Now we can lock exclusively
+ // Upgrade to exclusive lock (as per POSIX)
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX, mypid));
+
+ TWICE( // Wake up process to lock shared lock
+ PING_WORKER(3); // (R3)
+
+ // Shall not have lock immediately
+ NOT_WAIT_WORKER(6)); // (6)
+
+ // Release lock ; process will get it
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, mypid));
+ TWICE(WAIT_WORKER(6); // (6)
+
+ // We no longer have the lock
+ ASSERT_EQ(-EWOULDBLOCK,
+ ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, mypid));
+ ASSERT_EQ(-EWOULDBLOCK,
+ ceph_flock(cmount, fd, LOCK_SH | LOCK_NB, mypid));
+
+ // Wake up process to unlock exclusive lock
+ PING_WORKER(4); // (R4)
+ WAIT_WORKER(7); // (7)
+ );
+
+ // We can lock it again
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, mypid));
+ ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, mypid));
+
+ // Wait pids
+ int status;
+ ASSERT_EQ(pid[0], waitpid(pid[0], &status, 0));
+ ASSERT_EQ(EXIT_SUCCESS, status);
+ ASSERT_EQ(pid[1], waitpid(pid[1], &status, 0));
+ ASSERT_EQ(EXIT_SUCCESS, status);
+
+ // Cleanup
+ s.sem_destroy();
+ ASSERT_EQ(0, munmap(shs, sizeof(*shs)));
+ ASSERT_EQ(0, ceph_close(cmount, fd));
+ ASSERT_EQ(0, ceph_unlink(cmount, c_file));
+ CLEANUP_CEPH();
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-11 09:06:49 +0000