add TAG= to improve event filtering and device enumeration

[elogind.git] / libudev / libudev-device-private.c

diff --git a/libudev/libudev-device-private.c b/libudev/libudev-device-private.c
index 1bcf441237868c34296d3e7b4cf778436a62a650..13f1ebf88304316369d451ecedf00d3ff2f07fc6 100644 (file)
--- a/libudev/libudev-device-private.c
+++ b/libudev/libudev-device-private.c
@@ -1,7 +1,7 @@
 /*
  * libudev - interface to udev device information
  *
- * Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org>
+ * Copyright (C) 2008-2010 Kay Sievers <kay.sievers@vrfy.org>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -13,6 +13,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <stddef.h>
+#include <stdbool.h>
 #include <unistd.h>
 #include <fcntl.h>
 #include <string.h>
@@ -21,6 +22,37 @@
 #include "libudev.h"
 #include "libudev-private.h"
 
+static int udev_device_tag_index(struct udev_device *udev_device, bool add)
+{
+       struct udev *udev = udev_device_get_udev(udev_device);
+       struct udev_list_entry *list_entry;
+
+       udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(udev_device)) {
+               char filename[UTIL_PATH_SIZE];
+
+               util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/tags/",
+                             udev_list_entry_get_name(list_entry), "/",
+                             udev_device_get_subsystem(udev_device), ":", udev_device_get_sysname(udev_device), NULL);
+
+               if (add) {
+                       util_create_path(udev, filename);
+                       symlink(udev_device_get_devpath(udev_device), filename);
+                       if (udev_device_get_sysname_old(udev_device) != NULL) {
+                               char filename_old[UTIL_PATH_SIZE];
+
+                               util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/tags/",
+                                             udev_list_entry_get_name(list_entry),
+                                             udev_device_get_subsystem(udev_device), ":", udev_device_get_sysname_old(udev_device), NULL);
+                               unlink(filename_old);
+                       }
+               } else {
+                       unlink(filename);
+                       util_delete_path(udev, filename);
+               }
+       }
+       return 0;
+}
+
 int udev_device_update_db(struct udev_device *udev_device)
 {
        struct udev *udev = udev_device_get_udev(udev_device);
@@ -41,9 +73,7 @@ int udev_device_update_db(struct udev_device *udev_device)
        udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device))
                if (udev_list_entry_get_flags(list_entry))
                        goto file;
-       if (udev_device_get_num_fake_partitions(udev_device) != 0)
-               goto file;
-       if (udev_device_get_ignore_remove(udev_device))
+       if (udev_device_get_tags_list_entry(udev_device) != NULL)
                goto file;
        if (udev_device_get_devlink_priority(udev_device) != 0)
                goto file;
@@ -84,7 +114,7 @@ file:
        if (f == NULL) {
                err(udev, "unable to create temporary db file '%s': %m\n", filename_tmp);
                return -1;
-               }
+       }
 
        if (udev_device_get_devnode(udev_device) != NULL) {
                fprintf(f, "N:%s\n", &udev_device_get_devnode(udev_device)[devlen]);
@@ -95,10 +125,6 @@ file:
                fprintf(f, "L:%i\n", udev_device_get_devlink_priority(udev_device));
        if (udev_device_get_event_timeout(udev_device) >= 0)
                fprintf(f, "T:%i\n", udev_device_get_event_timeout(udev_device));
-       if (udev_device_get_num_fake_partitions(udev_device) != 0)
-               fprintf(f, "A:%i\n", udev_device_get_num_fake_partitions(udev_device));
-       if (udev_device_get_ignore_remove(udev_device))
-               fprintf(f, "R:%i\n", udev_device_get_ignore_remove(udev_device));
        if (udev_device_get_watch_handle(udev_device) >= 0)
                fprintf(f, "W:%i\n", udev_device_get_watch_handle(udev_device));
        udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) {
@@ -108,10 +134,13 @@ file:
                        udev_list_entry_get_name(list_entry),
                        udev_list_entry_get_value(list_entry));
        }
+       udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(udev_device))
+               fprintf(f, "G:%s\n", udev_list_entry_get_name(list_entry));
        fclose(f);
        rename(filename_tmp, filename);
        info(udev, "created db file for '%s' in '%s'\n", udev_device_get_devpath(udev_device), filename);
 out:
+       udev_device_tag_index(udev_device, true);
        return 0;
 }
 
@@ -120,6 +149,7 @@ int udev_device_delete_db(struct udev_device *udev_device)
        struct udev *udev = udev_device_get_udev(udev_device);
        char filename[UTIL_PATH_SIZE];
 
+       udev_device_tag_index(udev_device, false);
        util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/db/",
                      udev_device_get_subsystem(udev_device), ":", udev_device_get_sysname(udev_device), NULL);
        unlink(filename);
@@ -132,9 +162,13 @@ int udev_device_rename_db(struct udev_device *udev_device)
        char filename_old[UTIL_PATH_SIZE];
        char filename[UTIL_PATH_SIZE];
 
+       if (strcmp(udev_device_get_sysname(udev_device), udev_device_get_sysname_old(udev_device)) == 0)
+               return 0;
+
        util_strscpyl(filename_old, sizeof(filename_old), udev_get_dev_path(udev), "/.udev/db/",
                      udev_device_get_subsystem(udev_device), ":", udev_device_get_sysname_old(udev_device), NULL);
        util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/db/",
                      udev_device_get_subsystem(udev_device), ":", udev_device_get_sysname(udev_device), NULL);
+       udev_device_tag_index(udev_device, true);
        return rename(filename_old, filename);
 }