filemon: ensure watch IDs are unique to QFileMonitor scope

The watch IDs are mistakenly only unique within the scope of the
directory being monitored. This is not useful for clients which are
monitoring multiple directories. They require watch IDs to be unique
globally within the QFileMonitor scope.

Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Tested-by: Bandan Das <bsd@redhat.com>
Reviewed-by: Bandan Das <bsd@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>

diff --git a/tests/test-util-filemonitor.c b/tests/test-util-filemonitor.c
index ea3715a8f4437d14d3cddc1059147abe65b7315a..71a7cf5de050fa4726c8f1a79c54dc014377a13c 100644 (file)
--- a/tests/test-util-filemonitor.c
+++ b/tests/test-util-filemonitor.c
@@ -35,6 +35,8 @@ enum {
     QFILE_MONITOR_TEST_OP_RENAME,
     QFILE_MONITOR_TEST_OP_TOUCH,
     QFILE_MONITOR_TEST_OP_UNLINK,
+    QFILE_MONITOR_TEST_OP_MKDIR,
+    QFILE_MONITOR_TEST_OP_RMDIR,
 };
 
 typedef struct {
@@ -298,6 +300,54 @@ test_file_monitor_events(void)
           .eventid = QFILE_MONITOR_EVENT_DELETED },
 
 
+        { .type = QFILE_MONITOR_TEST_OP_MKDIR,
+          .filesrc = "fish", },
+        { .type = QFILE_MONITOR_TEST_OP_EVENT,
+          .filesrc = "fish", .watchid = 0,
+          .eventid = QFILE_MONITOR_EVENT_CREATED },
+
+
+        { .type = QFILE_MONITOR_TEST_OP_ADD_WATCH,
+          .filesrc = "fish/", .watchid = 4 },
+        { .type = QFILE_MONITOR_TEST_OP_ADD_WATCH,
+          .filesrc = "fish/one.txt", .watchid = 5 },
+        { .type = QFILE_MONITOR_TEST_OP_CREATE,
+          .filesrc = "fish/one.txt", },
+        { .type = QFILE_MONITOR_TEST_OP_EVENT,
+          .filesrc = "one.txt", .watchid = 4,
+          .eventid = QFILE_MONITOR_EVENT_CREATED },
+        { .type = QFILE_MONITOR_TEST_OP_EVENT,
+          .filesrc = "one.txt", .watchid = 5,
+          .eventid = QFILE_MONITOR_EVENT_CREATED },
+
+
+        { .type = QFILE_MONITOR_TEST_OP_DEL_WATCH,
+          .filesrc = "fish/one.txt", .watchid = 5 },
+        { .type = QFILE_MONITOR_TEST_OP_RENAME,
+          .filesrc = "fish/one.txt", .filedst = "two.txt", },
+        { .type = QFILE_MONITOR_TEST_OP_EVENT,
+          .filesrc = "one.txt", .watchid = 4,
+          .eventid = QFILE_MONITOR_EVENT_DELETED },
+        { .type = QFILE_MONITOR_TEST_OP_EVENT,
+          .filesrc = "two.txt", .watchid = 0,
+          .eventid = QFILE_MONITOR_EVENT_CREATED },
+        { .type = QFILE_MONITOR_TEST_OP_EVENT,
+          .filesrc = "two.txt", .watchid = 2,
+          .eventid = QFILE_MONITOR_EVENT_CREATED },
+
+
+        { .type = QFILE_MONITOR_TEST_OP_RMDIR,
+          .filesrc = "fish", },
+        { .type = QFILE_MONITOR_TEST_OP_EVENT,
+          .filesrc = "", .watchid = 4,
+          .eventid = QFILE_MONITOR_EVENT_IGNORED },
+        { .type = QFILE_MONITOR_TEST_OP_EVENT,
+          .filesrc = "fish", .watchid = 0,
+          .eventid = QFILE_MONITOR_EVENT_DELETED },
+        { .type = QFILE_MONITOR_TEST_OP_DEL_WATCH,
+          .filesrc = "fish", .watchid = 4 },
+
+
         { .type = QFILE_MONITOR_TEST_OP_UNLINK,
           .filesrc = "two.txt", },
         { .type = QFILE_MONITOR_TEST_OP_EVENT,
@@ -366,6 +416,8 @@ test_file_monitor_events(void)
         int fd;
         int watchid;
         struct utimbuf ubuf;
+        char *watchdir;
+        const char *watchfile;
 
         pathsrc = g_strdup_printf("%s/%s", dir, op->filesrc);
         if (op->filedst) {
@@ -378,13 +430,26 @@ test_file_monitor_events(void)
                 g_printerr("Add watch %s %s %d\n",
                            dir, op->filesrc, op->watchid);
             }
+            if (op->filesrc && strchr(op->filesrc, '/')) {
+                watchdir = g_strdup_printf("%s/%s", dir, op->filesrc);
+                watchfile = strrchr(watchdir, '/');
+                *(char *)watchfile = '\0';
+                watchfile++;
+                if (*watchfile == '\0') {
+                    watchfile = NULL;
+                }
+            } else {
+                watchdir = g_strdup(dir);
+                watchfile = op->filesrc;
+            }
             watchid =
                 qemu_file_monitor_add_watch(mon,
-                                            dir,
-                                            op->filesrc,
+                                            watchdir,
+                                            watchfile,
                                             qemu_file_monitor_test_handler,
                                             &data,
                                             &local_err);
+            g_free(watchdir);
             if (watchid < 0) {
                 g_printerr("Unable to add watch %s",
                            error_get_pretty(local_err));
@@ -400,9 +465,17 @@ test_file_monitor_events(void)
             if (debug) {
                 g_printerr("Del watch %s %d\n", dir, op->watchid);
             }
+            if (op->filesrc && strchr(op->filesrc, '/')) {
+                watchdir = g_strdup_printf("%s/%s", dir, op->filesrc);
+                watchfile = strrchr(watchdir, '/');
+                *(char *)watchfile = '\0';
+            } else {
+                watchdir = g_strdup(dir);
+            }
             qemu_file_monitor_remove_watch(mon,
-                                           dir,
+                                           watchdir,
                                            op->watchid);
+            g_free(watchdir);
             break;
         case QFILE_MONITOR_TEST_OP_EVENT:
             if (debug) {
@@ -492,6 +565,28 @@ test_file_monitor_events(void)
             }
             break;
 
+        case QFILE_MONITOR_TEST_OP_MKDIR:
+            if (debug) {
+                g_printerr("Mkdir %s\n", pathsrc);
+            }
+            if (mkdir(pathsrc, 0700) < 0) {
+                g_printerr("Unable to mkdir %s: %s",
+                           pathsrc, strerror(errno));
+                goto cleanup;
+            }
+            break;
+
+        case QFILE_MONITOR_TEST_OP_RMDIR:
+            if (debug) {
+                g_printerr("Rmdir %s\n", pathsrc);
+            }
+            if (rmdir(pathsrc) < 0) {
+                g_printerr("Unable to rmdir %s: %s",
+                           pathsrc, strerror(errno));
+                goto cleanup;
+            }
+            break;
+
         default:
             g_assert_not_reached();
         }
@@ -532,13 +627,18 @@ test_file_monitor_events(void)
             const QFileMonitorTestOp *op = &(ops[i]);
             char *path = g_strdup_printf("%s/%s",
                                          dir, op->filesrc);
-            unlink(path);
-            g_free(path);
-            if (op->filedst) {
-                path = g_strdup_printf("%s/%s",
-                                       dir, op->filedst);
+            if (op->type == QFILE_MONITOR_TEST_OP_MKDIR) {
+                rmdir(path);
+                g_free(path);
+            } else {
                 unlink(path);
                 g_free(path);
+                if (op->filedst) {
+                    path = g_strdup_printf("%s/%s",
+                                           dir, op->filedst);
+                    unlink(path);
+                    g_free(path);
+                }
             }
         }
         if (rmdir(dir) < 0) {

diff --git a/util/filemonitor-inotify.c b/util/filemonitor-inotify.c
index 3a72be037f1e7eeb54fca6caba8e5098e9351baf..3eb29f860be42a0ba363a85813aa926237e89efa 100644 (file)
--- a/util/filemonitor-inotify.c
+++ b/util/filemonitor-inotify.c
@@ -29,7 +29,7 @@
 
 struct QFileMonitor {
     int fd;
-
+    int nextid; /* watch ID counter */
     QemuMutex lock; /* protects dirs & idmap */
     GHashTable *dirs; /* dirname => QFileMonitorDir */
     GHashTable *idmap; /* inotify ID => dirname */
@@ -47,7 +47,6 @@ typedef struct {
 typedef struct {
     char *path;
     int id; /* inotify ID */
-    int nextid; /* watch ID counter */
     GArray *watches; /* QFileMonitorWatch elements */
 } QFileMonitorDir;
 
@@ -277,7 +276,7 @@ qemu_file_monitor_add_watch(QFileMonitor *mon,
         }
     }
 
-    watch.id = dir->nextid++;
+    watch.id = mon->nextid++;
     watch.filename = g_strdup(filename);
     watch.cb = cb;
     watch.opaque = opaque;