libudev: handle "device" link as parent, handle "class" "block" as "subsystem"

diff --git a/TODO b/TODO
index 763bcd1fcc1c6153dd3704d9b1ac6c9bc030c351..18f75b5f3e133633b0154fc076c4faf8715a85ef 100644 (file)
--- a/TODO
+++ b/TODO
@@ -11,6 +11,5 @@ These things will change in future udev versions:
   o symlink names to udevadm will no longer be resolved to old command names
 
 before next release:
-  o handle old "device" link in get_parent (CONFIG_SYSFS_DEPRECATED*=y)
-  o handle "subsystem", "driver", as device
   o switch libudev API to syspath instead of devpath
+  o udev_* prefix for private methods (ctrl_*)?

diff --git a/udev/lib/libudev-device.c b/udev/lib/libudev-device.c
index cda2de7490e6ef309d94b65a59c4e8c9800b2cdf..918398b7930aa7bc59ef5a6602ed4b197cc97d60 100644 (file)
--- a/udev/lib/libudev-device.c
+++ b/udev/lib/libudev-device.c
@@ -142,7 +142,7 @@ static int device_read_db(struct udev_device *udev_device)
                        device_set_ignore_remove(udev_device, atoi(val));
                        break;
                case 'E':
-                       device_add_property(udev_device, val);
+                       device_add_property_from_string(udev_device, val);
                        break;
                }
        }
@@ -236,15 +236,29 @@ static struct udev_device *device_new_from_parent(struct udev_device *udev_devic
                pos[0] = '\0';
                udev_device_parent = udev_device_new_from_devpath(udev_device->udev, path);
                if (udev_device_parent != NULL)
-                       break;
+                       return udev_device_parent;
+       }
+
+       /* follow "device" link in deprecated sysfs /sys/class/ layout */
+       if (strncmp(udev_device->devpath, "/class/", 7) == 0) {
+               util_strlcpy(path, udev_device->devpath, sizeof(path));
+               util_strlcat(path, "/device", sizeof(path));
+               if (util_resolve_sys_link(udev_device->udev, path, sizeof(path)) == 0) {
+                       udev_device_parent = udev_device_new_from_devpath(udev_device->udev, path);
+                       if (udev_device_parent != NULL)
+                               return udev_device_parent;
+               }
        }
-       return udev_device_parent;
+       return NULL;
 }
 
 struct udev_device *udev_device_get_parent(struct udev_device *udev_device)
 {
-       if (udev_device->parent_device == NULL)
-               udev_device->parent_device = device_new_from_parent(udev_device);
+       if (udev_device->parent_device != NULL) {
+               info(udev_device->udev, "returning existing parent %p\n", udev_device->parent_device);
+               return udev_device->parent_device;
+       }
+       udev_device->parent_device = device_new_from_parent(udev_device);
        return udev_device->parent_device;
 }
 
@@ -382,10 +396,29 @@ const char *udev_device_get_subsystem(struct udev_device *udev_device)
                return NULL;
        if (udev_device->subsystem != NULL)
                return udev_device->subsystem;
-       if (util_get_sys_subsystem(udev_device->udev, udev_device->devpath, subsystem, sizeof(subsystem)) < 2)
-               return NULL;
-       udev_device->subsystem = strdup(subsystem);
-       return udev_device->subsystem;
+
+       /* read "subsytem" link */
+       if (util_get_sys_subsystem(udev_device->udev, udev_device->devpath, subsystem, sizeof(subsystem)) == 0) {
+               udev_device->subsystem = strdup(subsystem);
+               return udev_device->subsystem;
+       }
+
+       /* implicit names */
+       if (strncmp(udev_device->devpath, "/module/", 8) == 0) {
+               udev_device->subsystem = strdup("module");
+               return udev_device->subsystem;
+       }
+       if (strstr(udev_device->devpath, "/drivers/") != NULL) {
+               udev_device->subsystem = strdup("drivers");
+               return udev_device->subsystem;
+       }
+       if (strncmp(udev_device->devpath, "/subsystem/", 11) == 0 ||
+           strncmp(udev_device->devpath, "/class/", 7) == 0 ||
+           strncmp(udev_device->devpath, "/bus/", 5) == 0) {
+               udev_device->subsystem = strdup("subsystem");
+               return udev_device->subsystem;
+       }
+       return NULL;
 }
 
 /**
@@ -442,17 +475,8 @@ int udev_device_get_properties(struct udev_device *udev_device,
        if (udev_device == NULL)
                return -1;
        list_for_each_entry(name_loop, &udev_device->env_list, node) {
-               char name[UTIL_NAME_SIZE];
-               char *val;
-
-               strncpy(name, name_loop->name, sizeof(name));
-               val = strchr(name, '=');
-               if (val == NULL)
-                       continue;
-               val[0] = '\0';
-               val = &val[1];
                count++;
-               if (cb(udev_device, name, val, data) != 0)
+               if (cb(udev_device, name_loop->name, name_loop->value, data) != 0)
                        break;
        }
        return count;
@@ -495,6 +519,7 @@ unsigned long long int udev_device_get_seqnum(struct udev_device *udev_device)
 
 const char *udev_device_get_attr_value(struct udev_device *udev_device, const char *attr)
 {
+       struct util_name_entry *name_loop;
        char path[UTIL_PATH_SIZE];
        char value[UTIL_NAME_SIZE];
        struct stat statbuf;
@@ -502,6 +527,14 @@ const char *udev_device_get_attr_value(struct udev_device *udev_device, const ch
        ssize_t size;
        const char *val = NULL;
 
+       /* look for possibly already cached result */
+       list_for_each_entry(name_loop, &udev_device->attr_list, node) {
+               if (strcmp(name_loop->name, attr) == 0) {
+                       info(udev_device->udev, "'%s' in cache '%s'\n", attr, name_loop->value);
+                       return name_loop->value;
+               }
+       }
+
        util_strlcpy(path, udev_device_get_syspath(udev_device), sizeof(path));
        util_strlcat(path, "/", sizeof(path));
        util_strlcat(path, attr, sizeof(path));
@@ -551,7 +584,7 @@ const char *udev_device_get_attr_value(struct udev_device *udev_device, const ch
        if (size == sizeof(value))
                goto out;
 
-       /* got a valid value, store and return it */
+       /* got a valid value, store it in cache and return it */
        value[size] = '\0';
        util_remove_trailing_chars(value, '\n');
        info(udev_device->udev, "'%s' has attribute value '%s'\n", path, value);
@@ -593,13 +626,30 @@ int device_add_devlink(struct udev_device *udev_device, const char *devlink)
        return 0;
 }
 
-int device_add_property(struct udev_device *udev_device, const char *property)
+int device_add_property(struct udev_device *udev_device, const char *key, const char *value)
 {
-       if (util_name_list_add(udev_device->udev, &udev_device->env_list, property, NULL, 0) == NULL)
+       if (util_name_list_add(udev_device->udev, &udev_device->env_list, key, value, 0) == NULL)
                return -ENOMEM;
        return 0;
 }
 
+int device_add_property_from_string(struct udev_device *udev_device, const char *property)
+{
+       char name[UTIL_PATH_SIZE];
+       char *val;
+
+       strncpy(name, property, sizeof(name));
+       val = strchr(name, '=');
+       if (val == NULL)
+               return -1;
+       val[0] = '\0';
+       val = &val[1];
+       if (val[0] == '\0')
+               val = NULL;
+       device_add_property(udev_device, name, val);
+       return 0;
+}
+
 int device_set_action(struct udev_device *udev_device, const char *action)
 {
        udev_device->action = strdup(action);

diff --git a/udev/lib/libudev-monitor.c b/udev/lib/libudev-monitor.c
index 60f7bc29e504fa041a58223d29aa71ee6803ac3c..8e9cf2d0eb5ef934272dd39e6418c95a6e939a7f 100644 (file)
--- a/udev/lib/libudev-monitor.c
+++ b/udev/lib/libudev-monitor.c
@@ -336,7 +336,7 @@ struct udev_device *udev_monitor_receive_device(struct udev_monitor *udev_monito
                } else if (strncmp(key, "TIMEOUT=", 8) == 0) {
                        device_set_timeout(udev_device, strtoull(&key[8], NULL, 10));
                }
-               device_add_property(udev_device, key);
+               device_add_property_from_string(udev_device, key);
        }
        device_set_devnum(udev_device, makedev(maj, min));
 

diff --git a/udev/lib/libudev-private.h b/udev/lib/libudev-private.h
index c2a32680385712cba06ce3f6c04d34f5d01715f2..f28bd9acfc3b345b7a8a3f62a2665de07cc0311a 100644 (file)
--- a/udev/lib/libudev-private.h
+++ b/udev/lib/libudev-private.h
@@ -59,7 +59,8 @@ extern int device_set_devpath(struct udev_device *udev_device, const char *devpa
 extern int device_set_subsystem(struct udev_device *udev_device, const char *subsystem);
 extern int device_set_devname(struct udev_device *udev_device, const char *devname);
 extern int device_add_devlink(struct udev_device *udev_device, const char *devlink);
-extern int device_add_property(struct udev_device *udev_device, const char *property);
+extern int device_add_property(struct udev_device *udev_device, const char *key, const char *value);
+extern int device_add_property_from_string(struct udev_device *udev_device, const char *property);
 extern int device_set_action(struct udev_device *udev_device, const char *action);
 extern int device_set_driver(struct udev_device *udev_device, const char *driver);
 extern const char *device_get_devpath_old(struct udev_device *udev_device);