discover/udev: Additional checks in udev_handle_block_add

- 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@au1.ibm.com>

diff --git a/discover/udev.c b/discover/udev.c
index 75393d51768cb9ab1782112a71c7c8d4f4cd4fdc..87a3748fe2f622749e3b65151d25d89b679db293 100644 (file)
--- 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",
+               NULL,
+       };
        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 +171,9 @@ 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);