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-Dependancies :
-==============
-
-o libdevmapper : comes with device-mapper-XXXX.tar.gz
-  See www.sistina.com
-  This lib has been dropped in the multipath tree
-o libsysfs : comes with sysutils or udev
-  See ftp.kernel.org/pub/linux/utils/kernel/hotplug/
-o Linux kernel 2.6.0 with udm5 patchset
-  http://people.sistina.com/~thornber/dm/
-o udev
-  See ftp.kernel.org/pub/linux/utils/kernel/hotplug/
-
-How it works :
-==============
-
-Fill the all_paths array. Each path store this info :
-
-struct path {
-        char dev[FILE_NAME_SIZE];
-        char sg_dev[FILE_NAME_SIZE];
-        struct scsi_idlun scsi_id;
-        struct sg_id sg_id;
-        int state;
-        char wwid[WWID_SIZE];
-};
-
-scsi_id, sg_dev and sg_id are only really useful for 2.4 
-kernels, for which SG cmnds must go through sg devs.
-In 2.5+ we have the nice opportunity to send SG cmnds
-through SCSI bdevs.
-
-For 2.4 compat, we pivot on idlun tupple to map sg devs
-to SCSI bdevs.
-
-2.4 does not do device enumeration, so we must scan a
-defined number of sg devs and scsi bdevs. Good enough.
-In 2.5+, we rely on libsysfs (sysutils) to access to
-sysfs device enums.
-
-the wwid is retrieved by a switch fonction. Only White
-Listed HW can filled this field. For now every FC array 
-HW listed in kernel's devinfo.c is White Listed, assuming
-the WWID is stored is the SCSI-3 standard 0x83 EVPD page.
-
-When all_paths is filled, we coalesce the paths and store
-the result in mp array. Each mp is a struct like this :
-
-struct multipath {
-        char wwid[WWID_SIZE];
-        int npaths;
-        int pindex[MAX_MP_PATHS];
-};
-
-When mp is filled, the device maps are fed to the kernel
-through libdevmapper.
-
-The naming of the corresponding block device is handeld 
-by udev with the help of the devmap_name proggy. It is 
-called by the following rule in /etc/udev/udev.rules :
-KERNEL="dm-[0-9]*", PROGRAM="/sbin/devmap_name %M %m", \
-NAME="%k", SYMLINK="%c"
-
-Notes :
-=======
-
-o On 2.4, make sure you have enough /dev/sg* nodes
-  (/dev/MAKEDEV if necesary). Same goes for /dev/sd*
-
-o path coalescing relies on a path unique id being found.
-  This unique id, lacking a standard method, is vendor
-  specific. A switch function (get_unique_id) is present
-  and an example function is provided for storageworks
-  arrays (get_evpd_wwid). Feel free to enrich
-  with hardware you have at hand :)
-
-o The kernel does NOT manage properly ghosts paths
-  with StorageWorks HW. Seems nobody cares after a load
-  of posts to linux-scsi.
-
-o 2.4.21 version of DM does not like even segment size.
-  if you enconter pbs with this, upgrade DM.
-
-Credits :
-=========
-
-o Heavy cut'n paste from sg_utils. Thanks goes to D. 
-  Gilbert.
-o Light cut'n paste from dmsetup. Thanks Joe Thornber.
-o Greg KH for the nice sysfs API.