X-Git-Url: http://git.ozlabs.org/?p=petitboot;a=blobdiff_plain;f=discover%2Fudev.c;h=537ef10263fa11193f03057d0335de48910abc0a;hp=e996e221228804d6a16a7a41aeb25463198800a8;hb=e6ba022cef0ab01bcfbd5ce2e0e3f93f6ee3376b;hpb=995e08e3de9aaff81e72227587ffcb4cc78175d0

diff --git a/discover/udev.c b/discover/udev.c
index e996e22..537ef10 100644
--- a/discover/udev.c
+++ b/discover/udev.c
@@ -1,5 +1,7 @@
 
-#define _GNU_SOURCE
+#if defined(HAVE_CONFIG_H)
+#include "config.h"
+#endif
 
 #include <assert.h>
 #include <errno.h>
@@ -22,15 +24,13 @@
 #include "udev.h"
 #include "pb-discover.h"
 #include "device-handler.h"
+#include "cdrom.h"
+#include "devmapper.h"
 
-#if defined(DEBUG)
-#define DBG(fmt, args...) pb_log("DBG: " fmt, ## args)
-#define DBGS(fmt, args...) \
-	pb_log("DBG:%s:%d: " fmt, __func__, __LINE__, ## args)
-#else
-#define DBG(fmt, args...)
-#define DBGS(fmt, args...)
-#endif
+/* We set a default monitor buffer size, as we may not process monitor
+ * events while performing device discvoery. systemd uses a 128M buffer, so
+ * we'll do the same here */
+static const int monitor_bufsize = 128 * 1024 * 1024;
 
 struct pb_udev {
 	struct udev *udev;
@@ -42,11 +42,15 @@ static int udev_destructor(void *p)
 {
 	struct pb_udev *udev = p;
 
-	udev_monitor_unref(udev->monitor);
-	udev->monitor = NULL;
+	if (udev->monitor) {
+		udev_monitor_unref(udev->monitor);
+		udev->monitor = NULL;
+	}
 
-	udev_unref(udev->udev);
-	udev->udev = NULL;
+	if (udev->udev) {
+		udev_unref(udev->udev);
+		udev->udev = NULL;
+	}
 
 	return 0;
 }
@@ -66,19 +70,25 @@ static void udev_setup_device_params(struct udev_device *udev,
 				udev_list_entry_get_value(entry));
 }
 
-static int udev_handle_dev_add(struct pb_udev *udev, struct udev_device *dev)
+static int udev_handle_block_add(struct pb_udev *udev, struct udev_device *dev,
+		const char *name)
 {
 	struct discover_device *ddev;
+	unsigned int i = 0;
 	const char *typestr;
-	const char *serial;
+	const char *uuid;
 	const char *path;
-	const char *name;
-
-	name = udev_device_get_sysname(dev);
-	if (!name) {
-		pb_debug("udev_device_get_sysname failed\n");
-		return -1;
-	}
+	const char *node;
+	const char *prop;
+	const char *type;
+	const char *devname;
+	const char *ignored_types[] = {
+		"linux_raid_member",
+		"swap",
+		"LVM2_member",
+		NULL,
+	};
+	bool cdrom, usb;
 
 	typestr = udev_device_get_devtype(dev);
 	if (!typestr) {
@@ -87,44 +97,127 @@ static int udev_handle_dev_add(struct pb_udev *udev, struct udev_device *dev)
 	}
 
 	if (!(!strcmp(typestr, "disk") || !strcmp(typestr, "partition"))) {
-		pb_debug("SKIP %s: invalid type %s\n", name, typestr);
+		pb_log("SKIP %s: invalid type %s\n", name, typestr);
 		return 0;
 	}
 
+	node = udev_device_get_devnode(dev);
 	path = udev_device_get_devpath(dev);
-	if (path && (strstr(path, "virtual/block/loop")
-			|| strstr(path, "virtual/block/ram"))) {
-		pb_debug("SKIP: %s: ignored (path=%s)\n", name, path);
+	if (path && strstr(path, "virtual/block/loop")) {
+		pb_log("SKIP: %s: ignored (path=%s)\n", name, path);
 		return 0;
 	}
 
-	/* We have enough info to create the device and start discovery */
-	ddev = device_lookup_by_id(udev->handler, name);
-	if (ddev) {
-		pb_debug("device %s is already present?\n", name);
-		return -1;
+	if (path && strstr(path, "virtual/block/ram")) {
+		device_handler_add_ramdisk(udev->handler, node);
+		return 0;
 	}
 
-	/* we may also see multipath devices; same dev nodes (hence id), but
-	 * different serial numbers */
-	serial = udev_device_get_property_value(dev, "ID_SERIAL");
-	if (serial && device_lookup_by_serial(udev->handler, serial))
-		return -1;
+	cdrom = node && !!udev_device_get_property_value(dev, "ID_CDROM");
+	if (cdrom) {
+		/* CDROMs require a little initialisation, to get
+		 * petitboot-compatible tray behaviour */
+		cdrom_init(node);
+		if (!cdrom_media_present(node)) {
+			pb_log("SKIP: %s: no media present\n", name);
+			return 0;
+		}
+	}
+
+	/* If our environment's udev can recognise them explictly skip any
+	 * device mapper devices we encounter */
+	devname = udev_device_get_property_value(dev, "DM_NAME");
+	if (devname) {
+		pb_debug("SKIP: dm-device %s\n", devname);
+		return 0;
+	}
+
+	type = udev_device_get_property_value(dev, "ID_FS_TYPE");
+	if (!type) {
+		pb_log("SKIP: %s: no ID_FS_TYPE property\n", name);
+		return 0;
+	}
+
+	while (ignored_types[i]) {
+		if (!strncmp(type, ignored_types[i], strlen(ignored_types[i]))) {
+			pb_log("SKIP: %s: ignore '%s' filesystem\n", name, type);
+			return 0;
+		}
+		i++;
+	}
+
+	/* We may see multipath devices; they'll have the same uuid as an
+	 * existing device, so only parse the first. */
+	uuid = udev_device_get_property_value(dev, "ID_FS_UUID");
+	if (uuid) {
+		ddev = device_lookup_by_uuid(udev->handler, uuid);
+		if (ddev) {
+			pb_log("SKIP: %s UUID [%s] already present (as %s)\n",
+					name, uuid, ddev->device->id);
+			return 0;
+		}
+	}
 
 	ddev = discover_device_create(udev->handler, name);
 
-	ddev->device_path = udev_device_get_devnode(dev);
-	ddev->uuid = udev_device_get_property_value(dev, "ID_FS_UUID");
-	ddev->label = udev_device_get_property_value(dev, "ID_FS_LABEL");
-	ddev->device->type = DEVICE_TYPE_DISK;
+	ddev->device_path = talloc_strdup(ddev, node);
+
+	if (uuid)
+		ddev->uuid = talloc_strdup(ddev, uuid);
+	prop = udev_device_get_property_value(dev, "ID_FS_LABEL");
+	if (prop)
+		ddev->label = talloc_strdup(ddev, prop);
+
+	usb = !!udev_device_get_property_value(dev, "ID_USB_DRIVER");
+	if (cdrom)
+		ddev->device->type = DEVICE_TYPE_OPTICAL;
+	else
+		ddev->device->type = usb ? DEVICE_TYPE_USB : DEVICE_TYPE_DISK;
 
 	udev_setup_device_params(dev, ddev);
 
-	device_handler_discover(udev->handler, ddev, CONF_METHOD_LOCAL_FILE);
+	/* Create a snapshot for all disks, unless it is an assembled RAID array */
+	if ((ddev->device->type == DEVICE_TYPE_DISK ||
+	     ddev->device->type == DEVICE_TYPE_USB) &&
+	    !udev_device_get_property_value(dev, "MD_LEVEL"))
+		devmapper_init_snapshot(udev->handler, ddev);
+
+	device_handler_discover(udev->handler, ddev);
 
 	return 0;
 }
 
+static int udev_handle_dev_add(struct pb_udev *udev, struct udev_device *dev)
+{
+	const char *subsys;
+	const char *name;
+
+	name = udev_device_get_sysname(dev);
+	if (!name) {
+		pb_debug("udev_device_get_sysname failed\n");
+		return -1;
+	}
+
+	subsys = udev_device_get_subsystem(dev);
+	if (!subsys) {
+		pb_debug("udev_device_get_subsystem failed\n");
+		return -1;
+	}
+
+	if (device_lookup_by_id(udev->handler, name)) {
+		pb_debug("device %s is already present?\n", name);
+		return -1;
+	}
+
+	if (!strcmp(subsys, "block")) {
+		return udev_handle_block_add(udev, dev, name);
+	}
+
+	pb_log("SKIP %s: unknown subsystem %s\n", name, subsys);
+	return -1;
+}
+
+
 static int udev_handle_dev_remove(struct pb_udev *udev, struct udev_device *dev)
 {
 	struct discover_device *ddev;
@@ -144,9 +237,86 @@ static int udev_handle_dev_remove(struct pb_udev *udev, struct udev_device *dev)
 
 	return 0;
 }
+
+/* returns true if further event processing should stop (eg., we've
+ * ejected the cdrom)
+ */
+static bool udev_handle_cdrom_events(struct pb_udev *udev,
+		struct udev_device *dev, struct discover_device *ddev)
+{
+	const char *node;
+	bool eject = false;
+
+	node = udev_device_get_devnode(dev);
+
+	/* handle CDROM eject requests */
+	if (udev_device_get_property_value(dev, "DISK_EJECT_REQUEST")) {
+		pb_debug("udev: eject request\n");
+
+		/* If the device is mounted, cdrom_id's own eject request may
+		 * have failed. So, we'll need to do our own here.
+		 */
+		if (ddev) {
+			eject = ddev->mounted;
+			udev_handle_dev_remove(udev, dev);
+		}
+
+		if (eject)
+			cdrom_eject(node);
+
+		return true;
+	}
+
+	if (udev_device_get_property_value(dev, "DISK_MEDIA_CHANGE")) {
+		if (cdrom_media_present(node))
+			udev_handle_dev_add(udev, dev);
+		else
+			udev_handle_dev_remove(udev, dev);
+		return true;
+	}
+
+	return false;
+}
+
+static int udev_handle_dev_change(struct pb_udev *udev, struct udev_device *dev)
+{
+	struct discover_device *ddev;
+	const char *name;
+	int rc = 0;
+
+	name = udev_device_get_sysname(dev);
+
+	ddev = device_lookup_by_id(udev->handler, name);
+
+	/* if this is a CDROM device, process eject & media change requests;
+	 * these may stop further processing */
+	if (!udev_device_get_property_value(dev, "ID_CDROM")) {
+		if (udev_handle_cdrom_events(udev, dev, ddev))
+			return 0;
+	}
+
+	/* if this is a new device, treat it as an add */
+	if (!ddev)
+		rc = udev_handle_dev_add(udev, dev);
+
+	return rc;
+}
+
 static int udev_handle_dev_action(struct udev_device *dev, const char *action)
 {
 	struct pb_udev *udev = udev_get_userdata(udev_device_get_udev(dev));
+	struct udev_list_entry *list;
+	const char *name;
+
+	list = udev_device_get_properties_list_entry(dev);
+	name = udev_device_get_sysname(dev);
+
+	pb_debug("udev: action %s, device %s\n", action, name);
+	pb_debug("udev: properties:\n");
+
+	for (; list; list = udev_list_entry_get_next(list))
+		pb_debug("\t%-20s: %s\n", udev_list_entry_get_name(list),
+				udev_list_entry_get_value(list));
 
 	if (!strcmp(action, "add"))
 		return udev_handle_dev_add(udev, dev);
@@ -154,6 +324,9 @@ static int udev_handle_dev_action(struct udev_device *dev, const char *action)
 	else if (!strcmp(action, "remove"))
 		return udev_handle_dev_remove(udev, dev);
 
+	else if (!strcmp(action, "change"))
+		return udev_handle_dev_change(udev, dev);
+
 	return 0;
 }
 
@@ -171,21 +344,21 @@ static int udev_enumerate(struct udev *udev)
 	}
 
 	result = udev_enumerate_add_match_subsystem(enumerate, "block");
-
 	if (result) {
 		pb_log("udev_enumerate_add_match_subsystem failed\n");
 		goto fail;
 	}
 
+	result = udev_enumerate_add_match_is_initialized(enumerate);
+	if (result) {
+		pb_log("udev_enumerate_add_match_is_initialised failed\n");
+		goto fail;
+	}
+
 	udev_enumerate_scan_devices(enumerate);
 
 	list = udev_enumerate_get_list_entry(enumerate);
 
-	if (!list) {
-		pb_log("udev_enumerate_get_list_entry failed\n");
-		goto fail;
-	}
-
 	udev_list_entry_foreach(entry, list) {
 		const char *syspath;
 		struct udev_device *dev;
@@ -219,6 +392,12 @@ static int udev_setup_monitor(struct udev *udev, struct udev_monitor **monitor)
 		goto out_err;
 	}
 
+	result = udev_monitor_set_receive_buffer_size(m, monitor_bufsize);
+	if (result) {
+		pb_log("udev_monitor_set_rx_bufsize(%d) failed\n",
+			monitor_bufsize);
+	}
+
 	result = udev_monitor_filter_add_match_subsystem_devtype(m, "block",
 		NULL);
 
@@ -251,10 +430,8 @@ static int udev_process(void *arg)
 	struct udev_monitor *monitor = arg;
 	struct udev_device *dev;
 	const char *action;
-	int result;
 
 	dev = udev_monitor_receive_device(monitor);
-
 	if (!dev) {
 		pb_log("udev_monitor_receive_device failed\n");
 		return -1;
@@ -264,17 +441,12 @@ static int udev_process(void *arg)
 
 	if (!action) {
 		pb_log("udev_device_get_action failed\n");
-		goto fail;
+	} else {
+		udev_handle_dev_action(dev, action);
 	}
 
-	result = udev_handle_dev_action(dev, action);
-
 	udev_device_unref(dev);
-	return result;
-
-fail:
-	udev_device_unref(dev);
-	return -1;
+	return 0;
 }
 
 static void udev_log_fn(struct udev __attribute__((unused)) *udev,
@@ -285,12 +457,13 @@ static void udev_log_fn(struct udev __attribute__((unused)) *udev,
       vfprintf(pb_log_get_stream(), format, args);
 }
 
-struct pb_udev *udev_init(struct waitset *waitset,
-	struct device_handler *handler)
+struct pb_udev *udev_init(struct device_handler *handler,
+		struct waitset *waitset)
 {
+	struct pb_udev *udev;
 	int result;
-	struct pb_udev *udev = talloc(NULL, struct pb_udev);
 
+	udev = talloc_zero(handler, struct pb_udev);
 	talloc_set_destructor(udev, udev_destructor);
 	udev->handler = handler;
 
@@ -298,39 +471,35 @@ struct pb_udev *udev_init(struct waitset *waitset,
 
 	if (!udev->udev) {
 		pb_log("udev_new failed\n");
-		goto fail_new;
+		goto fail;
 	}
 
 	udev_set_userdata(udev->udev, udev);
 
 	udev_set_log_fn(udev->udev, udev_log_fn);
 
-	result = udev_enumerate(udev->udev);
-
-	if (result)
-		goto fail_enumerate;
-
 	result = udev_setup_monitor(udev->udev, &udev->monitor);
+	if (result)
+		goto fail;
 
+	result = udev_enumerate(udev->udev);
 	if (result)
-		goto fail_monitor;
+		goto fail;
 
 	waiter_register_io(waitset, udev_monitor_get_fd(udev->monitor), WAIT_IN,
 		udev_process, udev->monitor);
 
-	pb_log("%s: waiting on udev\n", __func__);
+	pb_debug("%s: waiting on udev\n", __func__);
 
 	return udev;
 
-fail_monitor:
-fail_enumerate:
-	udev_unref(udev->udev);
-fail_new:
+fail:
 	talloc_free(udev);
 	return NULL;
 }
 
-void udev_destroy(struct pb_udev *udev)
+void udev_reinit(struct pb_udev *udev)
 {
-	talloc_free(udev);
+	pb_log("udev: reinit requested, starting enumeration\n");
+	udev_enumerate(udev->udev);
 }