[PATCH 2/3] discover/udev: Additional checks in udev_handle_block_add

[Samuel Mendoza-Jonas]

- Several filesystem types can appear that we won't be able to mount.
Instead of waiting to fail mounting them in device_handler_discover(),
skip processing them at all.

- Do not create dm-snapshots on top of raid arrays until we have a
reliable way of determining the sector count for a md raid device.

- Turn down the verbosity on skipping dm-devices.

Signed-off-by: Samuel Mendoza-Jonas <sam.mj at au1.ibm.com>
---
 discover/udev.c | 25 ++++++++++++++++++++++---
 1 file changed, 22 insertions(+), 3 deletions(-)

diff --git a/discover/udev.c b/discover/udev.c
index 75393d5..855f565 100644
--- a/discover/udev.c
+++ b/discover/udev.c
@@ -74,12 +74,20 @@ 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 *uuid;
 	const char *path;
 	const char *node;
 	const char *prop;
 	const char *type;
+	const char *devname;
+	const char *ignored_types[] = {
+		"linux_raid_member",
+		"swap",
+		"LVM2_member",
+		"",
+	};
 	bool cdrom;
 
 	typestr = udev_device_get_devtype(dev);
@@ -118,9 +126,9 @@ static int udev_handle_block_add(struct pb_udev *udev, struct udev_device *dev,
 
 	/* If our environment's udev can recognise them explictly skip any
 	 * device mapper devices we encounter */
-	const char *devname = udev_device_get_property_value(dev, "DM_NAME");
+	devname = udev_device_get_property_value(dev, "DM_NAME");
 	if (devname) {
-		pb_log("SKIP: dm-device %s\n", devname);
+		pb_debug("SKIP: dm-device %s\n", devname);
 		return 0;
 	}
 
@@ -130,6 +138,14 @@ static int udev_handle_block_add(struct pb_udev *udev, struct udev_device *dev,
 		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");
@@ -155,7 +171,10 @@ static int udev_handle_block_add(struct pb_udev *udev, struct udev_device *dev,
 
 	udev_setup_device_params(dev, ddev);
 
-	if (ddev->device->type == DEVICE_TYPE_DISK)
+
+	/* Create a snapshot for all disks, unless it is an assembled RAID array */
+	if (ddev->device->type == DEVICE_TYPE_DISK &&
+	    !udev_device_get_property_value(dev, "MD_LEVEL"))
 		devmapper_init_snapshot(udev->handler, ddev);
 
 	device_handler_discover(udev->handler, ddev);
-- 
2.5.0