libudev: device - read database only when needed

[elogind.git] / udev / lib / libudev-device.c

diff --git a/udev/lib/libudev-device.c b/udev/lib/libudev-device.c
index 359ae443dab2ec6059c66110a22e63b69dd7f60c..de4bd48e120a4706097def768f9369927a4d1915 100644 (file)
--- a/udev/lib/libudev-device.c
+++ b/udev/lib/libudev-device.c
@@ -37,11 +37,12 @@ struct udev_device {
        char *syspath;
        const char *devpath;
        const char *sysname;
-       char *devname;
+       char *devnode;
        char *subsystem;
-       struct list_head link_list;
+       struct list_head devlink_list;
        struct list_head properties_list;
        char *action;
+       int event_timeout;
        char *driver;
        char *devpath_old;
        char *physdevpath;
@@ -52,6 +53,7 @@ struct udev_device {
        int devlink_priority;
        int ignore_remove;
        struct list_head attr_list;
+       int info_loaded;
 };
 
 static size_t syspath_to_db_path(struct udev_device *udev_device, char *filename, size_t len)
@@ -65,42 +67,6 @@ static size_t syspath_to_db_path(struct udev_device *udev_device, char *filename
        return util_path_encode(&filename[start], len - start);
 }
 
-static int device_read_uevent_file(struct udev_device *udev_device)
-{
-       char filename[UTIL_PATH_SIZE];
-       FILE *f;
-       char line[UTIL_LINE_SIZE];
-       int maj = 0;
-       int min = 0;
-
-       util_strlcpy(filename, udev_device->syspath, sizeof(filename));
-       util_strlcat(filename, "/uevent", sizeof(filename));
-       f = fopen(filename, "r");
-       if (f == NULL)
-               return -1;
-
-       while (fgets(line, sizeof(line), f)) {
-               char *pos;
-
-               pos = strchr(line, '\n');
-               if (pos == NULL)
-                       continue;
-               pos[0] = '\0';
-
-               if (strncmp(line, "MAJOR=", 6) == 0)
-                       maj = strtoull(&line[6], NULL, 10);
-               else if (strncmp(line, "MINOR=", 6) == 0)
-                       min = strtoull(&line[6], NULL, 10);
-
-               device_add_property_from_string(udev_device, line);
-       }
-
-       udev_device->devnum = makedev(maj, min);
-
-       fclose(f);
-       return 0;
-}
-
 static int device_read_db(struct udev_device *udev_device)
 {
        struct stat stats;
@@ -118,7 +84,6 @@ static int device_read_db(struct udev_device *udev_device)
                char target[UTIL_PATH_SIZE];
                int target_len;
 
-               info(udev_device->udev, "found a symlink as db file\n");
                target_len = readlink(filename, target, sizeof(target));
                if (target_len > 0)
                        target[target_len] = '\0';
@@ -126,9 +91,9 @@ static int device_read_db(struct udev_device *udev_device)
                        info(udev_device->udev, "error reading db link %s: %s\n", filename, strerror(errno));
                        return -1;
                }
-               dbg(udev_device->udev, "db link points to '%s'\n", target);
-               if (asprintf(&udev_device->devname, "%s/%s", udev_get_dev_path(udev_device->udev), target) < 0)
+               if (asprintf(&udev_device->devnode, "%s/%s", udev_get_dev_path(udev_device->udev), target) < 0)
                        return -ENOMEM;
+               info(udev_device->udev, "device %p filled with db symlink data '%s'\n", udev_device, udev_device->devnode);
                return 0;
        }
 
@@ -149,7 +114,7 @@ static int device_read_db(struct udev_device *udev_device)
 
                switch(line[0]) {
                case 'N':
-                       asprintf(&udev_device->devname, "%s/%s", udev_get_dev_path(udev_device->udev), val);
+                       asprintf(&udev_device->devnode, "%s/%s", udev_get_dev_path(udev_device->udev), val);
                        break;
                case 'S':
                        util_strlcpy(filename, udev_get_dev_path(udev_device->udev), sizeof(filename));
@@ -161,7 +126,7 @@ static int device_read_db(struct udev_device *udev_device)
                        device_set_devlink_priority(udev_device, atoi(val));
                        break;
                case 'T':
-                       device_set_timeout(udev_device, atoi(val));
+                       device_set_event_timeout(udev_device, atoi(val));
                        break;
                case 'A':
                        device_set_num_fake_partitions(udev_device, atoi(val));
@@ -176,10 +141,58 @@ static int device_read_db(struct udev_device *udev_device)
        }
        fclose(f);
 
-       info(udev_device->udev, "device %p filled with udev database data\n", udev_device);
+       info(udev_device->udev, "device %p filled with db file data\n", udev_device);
+       return 0;
+}
+
+static int device_read_uevent_file(struct udev_device *udev_device)
+{
+       char filename[UTIL_PATH_SIZE];
+       FILE *f;
+       char line[UTIL_LINE_SIZE];
+       int maj = 0;
+       int min = 0;
+
+       util_strlcpy(filename, udev_device->syspath, sizeof(filename));
+       util_strlcat(filename, "/uevent", sizeof(filename));
+       f = fopen(filename, "r");
+       if (f == NULL)
+               return -1;
+
+       while (fgets(line, sizeof(line), f)) {
+               char *pos;
+
+               pos = strchr(line, '\n');
+               if (pos == NULL)
+                       continue;
+               pos[0] = '\0';
+
+               if (strncmp(line, "MAJOR=", 6) == 0)
+                       maj = strtoull(&line[6], NULL, 10);
+               else if (strncmp(line, "MINOR=", 6) == 0)
+                       min = strtoull(&line[6], NULL, 10);
+
+               device_add_property_from_string(udev_device, line);
+       }
+
+       udev_device->devnum = makedev(maj, min);
+
+       fclose(f);
        return 0;
 }
 
+static void device_load_info(struct udev_device *device)
+{
+       device_read_uevent_file(device);
+       device_read_db(device);
+       device->info_loaded = 1;
+}
+
+void device_set_info_loaded(struct udev_device *device)
+{
+       device->info_loaded = 1;
+}
+
 struct udev_device *device_init(struct udev *udev)
 {
        struct udev_device *udev_device;
@@ -193,7 +206,7 @@ struct udev_device *device_init(struct udev *udev)
        memset(udev_device, 0x00, sizeof(struct udev_device));
        udev_device->refcount = 1;
        udev_device->udev = udev;
-       INIT_LIST_HEAD(&udev_device->link_list);
+       INIT_LIST_HEAD(&udev_device->devlink_list);
        INIT_LIST_HEAD(&udev_device->properties_list);
        INIT_LIST_HEAD(&udev_device->attr_list);
        info(udev_device->udev, "udev_device: %p created\n", udev_device);
@@ -242,8 +255,6 @@ struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *
        device_set_syspath(udev_device, path);
        info(udev, "device %p has devpath '%s'\n", udev_device, udev_device_get_devpath(udev_device));
 
-       device_read_uevent_file(udev_device);
-       device_read_db(udev_device);
        return udev_device;
 }
 
@@ -272,7 +283,7 @@ struct udev_device *udev_device_new_from_devnum(struct udev *udev, char type, de
        enumerate = udev_enumerate_new_from_subsystems(udev, NULL);
        if (enumerate == NULL)
                return NULL;
-       list = udev_enumerate_get_devices_list(enumerate);
+       list = udev_enumerate_get_list(enumerate);
        while (list != NULL) {
                struct udev_device *device_loop;
 
@@ -382,9 +393,9 @@ void udev_device_unref(struct udev_device *udev_device)
        if (udev_device->parent_device != NULL)
                udev_device_unref(udev_device->parent_device);
        free(udev_device->syspath);
-       free(udev_device->devname);
+       free(udev_device->devnode);
        free(udev_device->subsystem);
-       list_cleanup(udev_device->udev, &udev_device->link_list);
+       list_cleanup(udev_device->udev, &udev_device->devlink_list);
        list_cleanup(udev_device->udev, &udev_device->properties_list);
        free(udev_device->action);
        free(udev_device->driver);
@@ -447,7 +458,9 @@ const char *udev_device_get_devnode(struct udev_device *udev_device)
 {
        if (udev_device == NULL)
                return NULL;
-       return udev_device->devname;
+       if (!udev_device->info_loaded)
+               device_load_info(udev_device);
+       return udev_device->devnode;
 }
 
 /**
@@ -507,7 +520,11 @@ const char *udev_device_get_subsystem(struct udev_device *udev_device)
  **/
 struct udev_list *udev_device_get_devlinks_list(struct udev_device *udev_device)
 {
-       return list_get_entry(&udev_device->link_list);
+       if (udev_device == NULL)
+               return NULL;
+       if (!udev_device->info_loaded)
+               device_load_info(udev_device);
+       return list_get_entry(&udev_device->devlink_list);
 }
 
 /**
@@ -524,6 +541,10 @@ struct udev_list *udev_device_get_devlinks_list(struct udev_device *udev_device)
  **/
 struct udev_list *udev_device_get_properties_list(struct udev_device *udev_device)
 {
+       if (udev_device == NULL)
+               return NULL;
+       if (!udev_device->info_loaded)
+               device_load_info(udev_device);
        return list_get_entry(&udev_device->properties_list);
 }
 
@@ -545,6 +566,8 @@ dev_t udev_device_get_devnum(struct udev_device *udev_device)
 {
        if (udev_device == NULL)
                return makedev(0, 0);
+       if (!udev_device->info_loaded)
+               device_load_info(udev_device);
        return udev_device->devnum;
 }
 
@@ -577,7 +600,7 @@ const char *udev_device_get_attr_value(struct udev_device *udev_device, const ch
        while (list != NULL) {
                if (strcmp(udev_list_get_name(list), attr) == 0) {
                        info(udev_device->udev, "got '%s' (%s) from cache\n", attr, udev_list_get_value(list));
-                       return udev_list_get_name(list);
+                       return udev_list_get_value(list);
                }
                list = udev_list_get_next(list);
        }
@@ -664,17 +687,17 @@ int device_set_subsystem(struct udev_device *udev_device, const char *subsystem)
        return 0;
 }
 
-int device_set_devname(struct udev_device *udev_device, const char *devname)
+int device_set_devnode(struct udev_device *udev_device, const char *devnode)
 {
-       udev_device->devname = strdup(devname);
-       if (udev_device->devname == NULL)
+       udev_device->devnode = strdup(devnode);
+       if (udev_device->devnode == NULL)
                return -ENOMEM;
        return 0;
 }
 
 int device_add_devlink(struct udev_device *udev_device, const char *devlink)
 {
-       if (list_insert(udev_device->udev, &udev_device->link_list, devlink, NULL, 0) == NULL)
+       if (list_insert(udev_device->udev, &udev_device->devlink_list, devlink, NULL, 0) == NULL)
                return -ENOMEM;
        return 0;
 }
@@ -721,8 +744,6 @@ int device_set_driver(struct udev_device *udev_device, const char *driver)
 
 const char *device_get_devpath_old(struct udev_device *udev_device)
 {
-       if (udev_device == NULL)
-               return NULL;
        return udev_device->devpath_old;
 }
 
@@ -736,8 +757,6 @@ int device_set_devpath_old(struct udev_device *udev_device, const char *devpath_
 
 const char *device_get_physdevpath(struct udev_device *udev_device)
 {
-       if (udev_device == NULL)
-               return NULL;
        return udev_device->physdevpath;
 }
 
@@ -751,8 +770,6 @@ int device_set_physdevpath(struct udev_device *udev_device, const char *physdevp
 
 int device_get_timeout(struct udev_device *udev_device)
 {
-       if (udev_device == NULL)
-               return -1;
        return udev_device->timeout;
 }
 
@@ -761,6 +778,18 @@ int device_set_timeout(struct udev_device *udev_device, int timeout)
        udev_device->timeout = timeout;
        return 0;
 }
+int device_get_event_timeout(struct udev_device *udev_device)
+{
+       if (!udev_device->info_loaded)
+               device_load_info(udev_device);
+       return udev_device->event_timeout;
+}
+
+int device_set_event_timeout(struct udev_device *udev_device, int event_timeout)
+{
+       udev_device->event_timeout = event_timeout;
+       return 0;
+}
 
 int device_set_seqnum(struct udev_device *udev_device, unsigned long long int seqnum)
 {
@@ -776,8 +805,8 @@ int device_set_devnum(struct udev_device *udev_device, dev_t devnum)
 
 int device_get_num_fake_partitions(struct udev_device *udev_device)
 {
-       if (udev_device == NULL)
-               return -1;
+       if (!udev_device->info_loaded)
+               device_load_info(udev_device);
        return udev_device->num_fake_partitions;
 }
 
@@ -789,8 +818,8 @@ int device_set_num_fake_partitions(struct udev_device *udev_device, int num)
 
 int device_get_devlink_priority(struct udev_device *udev_device)
 {
-       if (udev_device == NULL)
-               return -1;
+       if (!udev_device->info_loaded)
+               device_load_info(udev_device);
        return udev_device->devlink_priority;
 }
 
@@ -802,8 +831,8 @@ int device_set_devlink_priority(struct udev_device *udev_device, int prio)
 
 int device_get_ignore_remove(struct udev_device *udev_device)
 {
-       if (udev_device == NULL)
-               return -1;
+       if (!udev_device->info_loaded)
+               device_load_info(udev_device);
        return udev_device->ignore_remove;
 }