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From 3722729c29997c440ff1a289228f2953d10b2e5b Mon Sep 17 00:00:00 2001
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From: Max Reitz <mreitz@redhat.com>
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Date: Wed, 3 Apr 2019 17:13:12 +0100
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Subject: [PATCH 05/11] tests: Add unit tests for image locking
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RH-Author: Max Reitz <mreitz@redhat.com>
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Message-id: <20190403171315.20841-6-mreitz@redhat.com>
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Patchwork-id: 85402
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O-Subject: [RHEL-8.1 qemu-kvm PATCH 5/8] tests: Add unit tests for image locking
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Bugzilla: 1694148
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RH-Acked-by: John Snow <jsnow@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Stefano Garzarella <sgarzare@redhat.com>
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From: Fam Zheng <famz@redhat.com>
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Signed-off-by: Fam Zheng <famz@redhat.com>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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(cherry picked from commit aef96d7d4f0b6746e329bfa7a1ea38e1611237e3)
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Signed-off-by: Max Reitz <mreitz@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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 tests/Makefile.include     |   2 +
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 tests/test-image-locking.c | 157 +++++++++++++++++++++++++++++++++++++++++++++
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 2 files changed, 159 insertions(+)
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 create mode 100644 tests/test-image-locking.c
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diff --git a/tests/Makefile.include b/tests/Makefile.include
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index d200288..06ed6df 100644
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--- a/tests/Makefile.include
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+++ b/tests/Makefile.include
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@@ -97,6 +97,7 @@ check-unit-y += tests/test-bdrv-drain$(EXESUF)
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 check-unit-y += tests/test-blockjob$(EXESUF)
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 check-unit-y += tests/test-blockjob-txn$(EXESUF)
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 check-unit-y += tests/test-block-backend$(EXESUF)
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+check-unit-y += tests/test-image-locking$(EXESUF)
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 check-unit-y += tests/test-x86-cpuid$(EXESUF)
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 # all code tested by test-x86-cpuid is inside topology.h
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 gcov-files-test-x86-cpuid-y =
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@@ -635,6 +636,7 @@ tests/test-bdrv-drain$(EXESUF): tests/test-bdrv-drain.o $(test-block-obj-y) $(te
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 tests/test-blockjob$(EXESUF): tests/test-blockjob.o $(test-block-obj-y) $(test-util-obj-y)
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 tests/test-blockjob-txn$(EXESUF): tests/test-blockjob-txn.o $(test-block-obj-y) $(test-util-obj-y)
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 tests/test-block-backend$(EXESUF): tests/test-block-backend.o $(test-block-obj-y) $(test-util-obj-y)
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+tests/test-image-locking$(EXESUF): tests/test-image-locking.o $(test-block-obj-y) $(test-util-obj-y)
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 tests/test-thread-pool$(EXESUF): tests/test-thread-pool.o $(test-block-obj-y)
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 tests/test-iov$(EXESUF): tests/test-iov.o $(test-util-obj-y)
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 tests/test-hbitmap$(EXESUF): tests/test-hbitmap.o $(test-util-obj-y) $(test-crypto-obj-y)
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diff --git a/tests/test-image-locking.c b/tests/test-image-locking.c
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new file mode 100644
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index 0000000..7614cbf
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--- /dev/null
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+++ b/tests/test-image-locking.c
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@@ -0,0 +1,157 @@
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+/*
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+ * Image locking tests
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+ *
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+ * Copyright (c) 2018 Red Hat Inc.
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+ *
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+ * Author: Fam Zheng <famz@redhat.com>
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+ *
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+ * Permission is hereby granted, free of charge, to any person obtaining a copy
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+ * of this software and associated documentation files (the "Software"), to deal
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+ * in the Software without restriction, including without limitation the rights
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+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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+ * copies of the Software, and to permit persons to whom the Software is
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+ * furnished to do so, subject to the following conditions:
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+ *
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+ * The above copyright notice and this permission notice shall be included in
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+ * all copies or substantial portions of the Software.
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+ *
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+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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+ * THE SOFTWARE.
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+ */
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+
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+#include "qemu/osdep.h"
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+#include "block/block.h"
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+#include "sysemu/block-backend.h"
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+#include "qapi/error.h"
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+#include "qapi/qmp/qdict.h"
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+
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+static BlockBackend *open_image(const char *path,
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+                                uint64_t perm, uint64_t shared_perm,
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+                                Error **errp)
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+{
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+    Error *local_err = NULL;
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+    BlockBackend *blk;
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+    QDict *options = qdict_new();
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+
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+    qdict_put_str(options, "driver", "raw");
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+    blk = blk_new_open(path, NULL, options, BDRV_O_RDWR, &local_err);
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+    if (blk) {
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+        g_assert_null(local_err);
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+        if (blk_set_perm(blk, perm, shared_perm, errp)) {
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+            blk_unref(blk);
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+            blk = NULL;
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+        }
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+    } else {
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+        error_propagate(errp, local_err);
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+    }
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+    return blk;
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+}
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+
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+static void check_locked_bytes(int fd, uint64_t perm_locks,
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+                               uint64_t shared_perm_locks)
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+{
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+    int i;
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+
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+    if (!perm_locks && !shared_perm_locks) {
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+        g_assert(!qemu_lock_fd_test(fd, 0, 0, true));
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+        return;
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+    }
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+    for (i = 0; (1ULL << i) <= BLK_PERM_ALL; i++) {
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+        uint64_t bit = (1ULL << i);
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+        bool perm_expected = !!(bit & perm_locks);
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+        bool shared_perm_expected = !!(bit & shared_perm_locks);
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+        g_assert_cmpint(perm_expected, ==,
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+                        !!qemu_lock_fd_test(fd, 100 + i, 1, true));
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+        g_assert_cmpint(shared_perm_expected, ==,
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+                        !!qemu_lock_fd_test(fd, 200 + i, 1, true));
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+    }
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+}
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+
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+static void test_image_locking_basic(void)
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+{
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+    BlockBackend *blk1, *blk2, *blk3;
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+    char img_path[] = "/tmp/qtest.XXXXXX";
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+    uint64_t perm, shared_perm;
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+
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+    int fd = mkstemp(img_path);
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+    assert(fd >= 0);
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+
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+    perm = BLK_PERM_WRITE | BLK_PERM_CONSISTENT_READ;
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+    shared_perm = BLK_PERM_ALL;
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+    blk1 = open_image(img_path, perm, shared_perm, &error_abort);
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+    g_assert(blk1);
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+
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+    check_locked_bytes(fd, perm, ~shared_perm);
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+
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+    /* compatible perm between blk1 and blk2 */
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+    blk2 = open_image(img_path, perm | BLK_PERM_RESIZE, shared_perm, NULL);
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+    g_assert(blk2);
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+    check_locked_bytes(fd, perm | BLK_PERM_RESIZE, ~shared_perm);
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+
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+    /* incompatible perm with already open blk1 and blk2 */
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+    blk3 = open_image(img_path, perm, BLK_PERM_WRITE_UNCHANGED, NULL);
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+    g_assert_null(blk3);
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+
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+    blk_unref(blk2);
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+
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+    /* Check that extra bytes in blk2 are correctly unlocked */
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+    check_locked_bytes(fd, perm, ~shared_perm);
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+
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+    blk_unref(blk1);
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+
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+    /* Image is unused, no lock there */
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+    check_locked_bytes(fd, 0, 0);
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+    blk3 = open_image(img_path, perm, BLK_PERM_WRITE_UNCHANGED, &error_abort);
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+    g_assert(blk3);
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+    blk_unref(blk3);
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+    close(fd);
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+    unlink(img_path);
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+}
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+
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+static void test_set_perm_abort(void)
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+{
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+    BlockBackend *blk1, *blk2;
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+    char img_path[] = "/tmp/qtest.XXXXXX";
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+    uint64_t perm, shared_perm;
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+    int r;
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+    int fd = mkstemp(img_path);
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+    assert(fd >= 0);
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+
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+    perm = BLK_PERM_WRITE | BLK_PERM_CONSISTENT_READ;
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+    shared_perm = BLK_PERM_ALL;
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+    blk1 = open_image(img_path, perm, shared_perm, &error_abort);
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+    g_assert(blk1);
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+
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+    blk2 = open_image(img_path, perm, shared_perm, &error_abort);
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+    g_assert(blk2);
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+
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+    check_locked_bytes(fd, perm, ~shared_perm);
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+
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+    /* A failed blk_set_perm mustn't change perm status (locked bytes) */
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+    r = blk_set_perm(blk2, perm | BLK_PERM_RESIZE, BLK_PERM_WRITE_UNCHANGED,
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+                     NULL);
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+    g_assert_cmpint(r, !=, 0);
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+    check_locked_bytes(fd, perm, ~shared_perm);
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+    blk_unref(blk1);
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+    blk_unref(blk2);
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+}
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+
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+int main(int argc, char **argv)
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+{
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+    bdrv_init();
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+    qemu_init_main_loop(&error_abort);
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+
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+    g_test_init(&argc, &argv, NULL);
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+
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+    if (qemu_has_ofd_lock()) {
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+        g_test_add_func("/image-locking/basic", test_image_locking_basic);
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+        g_test_add_func("/image-locking/set-perm-abort", test_set_perm_abort);
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+    }
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+
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+    return g_test_run();
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+}
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-- 
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1.8.3.1
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