From 31de3a2ba18ffa011f5054016ccc4a500cbe0cc3 Mon Sep 17 00:00:00 2001
From: Kay Sievers <kay.sievers@vrfy.org>
Date: Sat, 17 Mar 2007 10:08:25 +0100
Subject: read list of devices from index, make index private to database

---
 test-udev.c   |  2 +-
 udev.h        |  3 ++-
 udev_db.c     | 42 +++++++++++++++++++++++++++++++++++++++++-
 udev_device.c | 13 ++++++-------
 udev_node.c   |  2 +-
 udev_rules.c  |  4 ++--
 udevd.c       |  2 +-
 udevinfo.c    | 50 ++++++++++++++++++++++++++++++++++++++++----------
 udevstart.c   |  2 +-
 udevtest.c    |  2 +-
 10 files changed, 96 insertions(+), 26 deletions(-)

diff --git a/test-udev.c b/test-udev.c
index e40a448436..ba36015911 100644
--- a/test-udev.c
+++ b/test-udev.c
@@ -136,7 +136,7 @@ int main(int argc, char *argv[], char *envp[])
 		goto fail;
 	}
 
-	udev = udev_device_init();
+	udev = udev_device_init(NULL);
 	if (udev == NULL)
 		goto fail;
 
diff --git a/udev.h b/udev.h
index 31542243e2..16a107a33d 100644
--- a/udev.h
+++ b/udev.h
@@ -99,7 +99,7 @@ extern int udev_run;
 extern void udev_config_init(void);
 
 /* udev_device.c */
-extern struct udevice *udev_device_init(void);
+extern struct udevice *udev_device_init(struct udevice *udev);
 extern void udev_device_cleanup(struct udevice *udev);
 extern int udev_device_event(struct udev_rules *rules, struct udevice *udev);
 extern dev_t udev_device_get_devt(struct udevice *udev);
@@ -127,6 +127,7 @@ extern int udev_db_add_device(struct udevice *dev);
 extern int udev_db_delete_device(struct udevice *dev);
 extern int udev_db_get_device(struct udevice *udev, const char *devpath);
 extern int udev_db_lookup_name(const char *name, char *devpath, size_t len);
+extern int udev_db_get_devices_by_name(const char *name, struct list_head *name_list);
 extern int udev_db_get_all_entries(struct list_head *name_list);
 
 /* udev_utils.c */
diff --git a/udev_db.c b/udev_db.c
index 40082abf03..8c9e474ad4 100644
--- a/udev_db.c
+++ b/udev_db.c
@@ -77,6 +77,46 @@ static int name_index(const char *devpath, const char *name, int add)
 	return 0;
 }
 
+int udev_db_get_devices_by_name(const char *name, struct list_head *name_list)
+{
+	char dirname[PATH_MAX];
+	size_t start;
+	DIR *dir;
+	int rc = 0;
+
+	strlcpy(dirname, udev_root, sizeof(dirname));
+	start = strlcat(dirname, "/"DB_NAME_INDEX_DIR"/", sizeof(dirname));
+	strlcat(dirname, name, sizeof(dirname));
+	path_encode(&dirname[start], sizeof(dirname) - start);
+
+	dir = opendir(dirname);
+	if (dir == NULL) {
+		info("no index directory '%s': %s", dirname, strerror(errno));
+		rc = -1;
+		goto out;
+	}
+
+	info("found index directory '%s'", dirname);
+	while (1) {
+		struct dirent *ent;
+		char device[PATH_SIZE];
+
+		ent = readdir(dir);
+		if (ent == NULL || ent->d_name[0] == '\0')
+			break;
+		if (ent->d_name[0] == '.')
+			continue;
+
+		strlcpy(device, ent->d_name, sizeof(device));
+		path_decode(device);
+		name_list_add(name_list, device, 0);
+		rc++;
+	}
+	closedir(dir);
+out:
+	return rc;
+}
+
 int udev_db_add_device(struct udevice *udev)
 {
 	char filename[PATH_SIZE];
@@ -288,7 +328,7 @@ int udev_db_lookup_name(const char *name, char *devpath, size_t len)
 
 		strlcpy(device, ent->d_name, sizeof(device));
 		path_decode(device);
-		udev = udev_device_init();
+		udev = udev_device_init(NULL);
 		if (udev == NULL)
 			break;
 		if (udev_db_get_device(udev, device) == 0) {
diff --git a/udev_device.c b/udev_device.c
index daf94a5772..4cd5526dea 100644
--- a/udev_device.c
+++ b/udev_device.c
@@ -33,11 +33,10 @@
 #include "udev_rules.h"
 
 
-struct udevice *udev_device_init(void)
+struct udevice *udev_device_init(struct udevice *udev)
 {
-	struct udevice *udev;
-
-	udev = malloc(sizeof(struct udevice));
+	if (udev == NULL)
+		udev = malloc(sizeof(struct udevice));
 	if (udev == NULL)
 		return NULL;
 	memset(udev, 0x00, sizeof(struct udevice));
@@ -162,8 +161,8 @@ int udev_device_event(struct udev_rules *rules, struct udevice *udev)
 			goto exit;
 		}
 
-		/* read current database entry, we may need to cleanup */
-		udev_old = udev_device_init();
+		/* read current database entry; cleanup, if it is known device */
+		udev_old = udev_device_init(NULL);
 		if (udev_old != NULL) {
 			if (udev_db_get_device(udev_old, udev->dev->devpath) == 0) {
 				info("device '%s' already in database, cleanup", udev->dev->devpath);
@@ -241,7 +240,7 @@ int udev_device_event(struct udev_rules *rules, struct udevice *udev)
 	if (major(udev->devt) != 0 && strcmp(udev->action, "remove") == 0) {
 		struct name_entry *name_loop;
 
-		/* import and delete database entry */
+		/* import database entry, and delete it */
 		if (udev_db_get_device(udev, udev->dev->devpath) == 0) {
 			udev_db_delete_device(udev);
 			if (udev->ignore_remove) {
diff --git a/udev_node.c b/udev_node.c
index ed323e9449..1558df849c 100644
--- a/udev_node.c
+++ b/udev_node.c
@@ -275,7 +275,7 @@ void udev_node_remove_symlinks(struct udevice *udev)
 				struct udevice *old;
 
 				info("found overwritten symlink '%s' of '%s'", name_loop->name, devpath);
-				old = udev_device_init();
+				old = udev_device_init(NULL);
 				if (old != NULL) {
 					if (udev_db_get_device(old, devpath) == 0) {
 						char slink[PATH_SIZE];
diff --git a/udev_rules.c b/udev_rules.c
index c0f4cd2077..ea02b8e945 100644
--- a/udev_rules.c
+++ b/udev_rules.c
@@ -236,7 +236,7 @@ static int import_parent_into_env(struct udevice *udev, const char *filter)
 		struct name_entry *name_loop;
 
 		dbg("found parent '%s', get the node name", dev_parent->devpath);
-		udev_parent = udev_device_init();
+		udev_parent = udev_device_init(NULL);
 		if (udev_parent == NULL)
 			return -1;
 		/* import the udev_db of the parent */
@@ -518,7 +518,7 @@ found:
 					struct udevice *udev_parent;
 
 					dbg("found parent '%s', get the node name", dev_parent->devpath);
-					udev_parent = udev_device_init();
+					udev_parent = udev_device_init(NULL);
 					if (udev_parent != NULL) {
 						/* lookup the name in the udev_db with the DEVPATH of the parent */
 						if (udev_db_get_device(udev_parent, dev_parent->devpath) == 0) {
diff --git a/udevd.c b/udevd.c
index 4aad165d8a..8f3329ea63 100644
--- a/udevd.c
+++ b/udevd.c
@@ -124,7 +124,7 @@ static int udev_event_process(struct udevd_uevent_msg *msg)
 	for (i = 0; msg->envp[i]; i++)
 		putenv(msg->envp[i]);
 
-	udev = udev_device_init();
+	udev = udev_device_init(NULL);
 	if (udev == NULL)
 		return -1;
 	strlcpy(udev->action, msg->action, sizeof(udev->action));
diff --git a/udevinfo.c b/udevinfo.c
index 3f47add87c..e892b1092e 100644
--- a/udevinfo.c
+++ b/udevinfo.c
@@ -167,7 +167,7 @@ static void export_db(void fnct(struct udevice *udev)) {
 	list_for_each_entry(name_loop, &name_list, node) {
 		struct udevice *udev_db;
 
-		udev_db = udev_device_init();
+		udev_db = udev_device_init(NULL);
 		if (udev_db == NULL)
 			continue;
 		if (udev_db_get_device(udev_db, name_loop->name) == 0)
@@ -177,6 +177,41 @@ static void export_db(void fnct(struct udevice *udev)) {
 	name_list_cleanup(&name_list);
 }
 
+static int lookup_device_by_name(struct udevice *udev, const char *name)
+{
+	LIST_HEAD(name_list);
+	struct name_entry *device;
+	int rc  = -1;
+
+	if (udev_db_get_devices_by_name(name, &name_list) <= 0)
+		goto out;
+
+	/* select the device that matches the dev_t of name */
+	list_for_each_entry(device, &name_list, node) {
+		char filename[PATH_SIZE];
+		struct stat statbuf;
+
+		udev_device_init(udev);
+		if (udev_db_get_device(udev, device->name) != 0)
+			continue;
+		info("found db entry '%s'", device->name);
+
+		strlcpy(filename, udev_root, sizeof(filename));
+		strlcat(filename, "/", sizeof(filename));
+		strlcat(filename, name, sizeof(filename));
+		if (stat(filename, &statbuf) != 0)
+			continue;
+		if (statbuf.st_rdev == udev->devt) {
+			info("found '%s', dev_t matches", udev->name);
+			rc = 0;
+			break;
+		}
+	}
+out:
+	name_list_cleanup(&name_list);
+	return rc;
+}
+
 int main(int argc, char *argv[], char *envp[])
 {
 	int option;
@@ -220,7 +255,7 @@ int main(int argc, char *argv[], char *envp[])
 	udev_config_init();
 	sysfs_init();
 
-	udev = udev_device_init();
+	udev = udev_device_init(NULL);
 	if (udev == NULL) {
 		rc = 1;
 		goto exit;
@@ -330,14 +365,11 @@ int main(int argc, char *argv[], char *envp[])
 				goto exit;
 			}
 		} else if (name[0] != '\0') {
-			char devpath[PATH_SIZE];
-
-			if (udev_db_lookup_name(name, devpath, sizeof(devpath)) != 0) {
+			if (lookup_device_by_name(udev, name) != 0) {
 				fprintf(stderr, "node name not found\n");
 				rc = 4;
 				goto exit;
 			}
-			udev_db_get_device(udev, devpath);
 		} else {
 			fprintf(stderr, "query needs --path or node --name specified\n");
 			rc = 4;
@@ -385,14 +417,12 @@ int main(int argc, char *argv[], char *envp[])
 				goto exit;
 			}
 		} else if (name[0] != '\0') {
-			char devpath[PATH_SIZE];
-
-			if (udev_db_lookup_name(name, devpath, sizeof(devpath)) != 0) {
+			if (lookup_device_by_name(udev, name) != 0) {
 				fprintf(stderr, "node name not found\n");
 				rc = 4;
 				goto exit;
 			}
-			if (print_device_chain(devpath) != 0) {
+			if (print_device_chain(udev->dev->devpath) != 0) {
 				fprintf(stderr, "device not found\n");
 				rc = 4;
 				goto exit;
diff --git a/udevstart.c b/udevstart.c
index 6ea18272ea..a381c411a8 100644
--- a/udevstart.c
+++ b/udevstart.c
@@ -120,7 +120,7 @@ static int add_device(const char *devpath)
 	if (dev == NULL)
 		return -1;
 
-	udev = udev_device_init();
+	udev = udev_device_init(NULL);
 	if (udev == NULL)
 		return -1;
 
diff --git a/udevtest.c b/udevtest.c
index 73bf7dd1f8..bb889a70fd 100644
--- a/udevtest.c
+++ b/udevtest.c
@@ -97,7 +97,7 @@ int main(int argc, char *argv[], char *envp[])
 		goto exit;
 	}
 
-	udev = udev_device_init();
+	udev = udev_device_init(NULL);
 	if (udev == NULL) {
 		fprintf(stderr, "error initializing device\n");
 		rc = 3;
-- 
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