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patch follows :
* remove the restrictive -f flag.
Introduce a more generic "-m iopolicy" one.
* remove useless "int with_sysfs" in env struct
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incremental to udev-016/extras/multipath-0.0.16.3,
* add a GROUP_BY_SERIAL flag. This should be useful for
controlers that activate their spare paths on simple IO
submition with a penalty. The StorageWorks HW defaults to
this mode, even if the MULTIBUS mode is OK.
* remove unused sg_err.c
* big restructuring : split devinfo.c from main.c. Export :
* void basename (char *, char *);
* int get_serial (int, char *);
* int get_lun_strings (char *, char *, char *, char *);
* int get_evpd_wwid(char *, char *);
* long get_disk_size (char *);
Now we see clearly what is expected from an external package
like scsi_id.
* stop passing struct env as param
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incremental to 20031220,
2003-12-22 multipath-010
* don't print .sg_dev if equal to .dev (2.6) in print_path()
* since the kernel code handles defective paths, remove all
code to cope with them :
* move do_tur() to unused.c
* remove .state from path struct
* remove .state settings & conditionals
* add a cmdline switch to force maps to failover mode,
ie 1 path per priority group
* add default policies to the whitelist array (spread io ==
MULTIBUS / io forced to 1 path == FAILOVER)
* move get_disk_size() call out of add_map() to coalesce()
* comment tricky coalesce() fn
* bogus unsused.c file renamed to unused.c
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An important one, against stock udev-009 :
2003-12-20 multipath-010
* big ChangeLog update
* start to give a little control over target params :
introduce cmdline arg -i to control polling interval
* cope with hotplug-style calling convention :
ie "multipath scsi $DEVPATH" ... to avoid messing with
online maps not concerned by an event
* example hotplug agent to drop in /etc/hotplug.d/scsi
* revert the run & resched patch : unless someone proves me
wrong, this was overdesigned
* move commented out functions in unused.c
* update multipath target params to "udm[23] style"
* mp target now supports nr_path == 1, so do we
* add gratuitous free()
* push version forward
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* configure the multipath target with round-robin path selector and
conservative default for a start : yes it makes this release the first
really useful one.
* temporarily disable map creation for single path device due to current
restrictive defaults in the kernel target. Sistina should work it out.
* correct the strncmp logic in blacklist function.
Tested on StorageWorks with 2.6.0-test10-udm1 :
xa-s03:~# ./multipath -v
60001fe1000bdad0000903507109004b (1 0 1 1) /dev/sda op:1 /dev/sda
[HSG80 ]
60001fe1000bdad000090371312100bf (1 0 1 2) /dev/sdb op:1 /dev/sdb
[HSG80 ]
60001fe1000bdad000090371312100c2 (1 0 1 3) /dev/sdc op:1 /dev/sdc
[HSG80 ]
60001fe1000bdad00009037131210067 (1 0 2 1) /dev/sdd op:1 /dev/sdd
[HSG80 ]
60001fe1000bdad000090371312100b3 (1 0 2 2) /dev/sde op:1 /dev/sde
[HSG80 ]
60001fe1000bdad00009035071090024 (1 0 2 3) /dev/sdf op:1 /dev/sdf
[HSG80 ]
600508b4000156d700012000000b0000 (1 0 3 1) /dev/sdg op:1 /dev/sdg
[HSV110 (C)COMPAQ]
600508b4000156c30001200000210000 (1 0 3 2) /dev/sdh op:1 /dev/sdh
[HSV110 (C)COMPAQ]
600508b4000156d700012000000b0000 (1 0 6 1) /dev/sdi op:1 /dev/sdi
[HSV110 (C)COMPAQ]
600508b4000156c30001200000210000 (1 0 6 2) /dev/sdj op:1 /dev/sdj
[HSV110 (C)COMPAQ]
60001fe1000bdad0000903507109004b
\_(1 0 1 1) /dev/sda op:1 /dev/sda [HSG80 ]
60001fe1000bdad000090371312100bf
\_(1 0 1 2) /dev/sdb op:1 /dev/sdb [HSG80 ]
60001fe1000bdad000090371312100c2
\_(1 0 1 3) /dev/sdc op:1 /dev/sdc [HSG80 ]
60001fe1000bdad00009037131210067
\_(1 0 2 1) /dev/sdd op:1 /dev/sdd [HSG80 ]
60001fe1000bdad000090371312100b3
\_(1 0 2 2) /dev/sde op:1 /dev/sde [HSG80 ]
60001fe1000bdad00009035071090024
\_(1 0 2 3) /dev/sdf op:1 /dev/sdf [HSG80 ]
600508b4000156d700012000000b0000
\_(1 0 3 1) /dev/sdg op:1 /dev/sdg [HSV110 (C)COMPAQ]
\_(1 0 6 1) /dev/sdi op:1 /dev/sdi [HSV110 (C)COMPAQ]
600508b4000156c30001200000210000
\_(1 0 3 2) /dev/sdh op:1 /dev/sdh [HSV110 (C)COMPAQ]
\_(1 0 6 2) /dev/sdj op:1 /dev/sdj [HSV110 (C)COMPAQ]
N|600508b4000156d700012000000b0000 : 0 4194304 multipath 2 2 10
round-robin 2 /dev/sdg 10 2 1 2 /dev/sdi 10 2 1 2
N|600508b4000156c30001200000210000 : 0 20971520 multipath 2 2 10
round-robin 2 /dev/sdh 10 2 1 2 /dev/sdj 10 2 1 2
xa-s03:~# dmsetup ls
600508b4000156c30001200000210000 (254, 1)
600508b4000156d700012000000b0000 (254, 0)
xa-s03:~# ll /dev/mapper/
total 0
brw------- 1 root root 254, 1 Dec 9 22:57
600508b4000156c30001200000210000
brw------- 1 root root 254, 0 Dec 9 22:57
600508b4000156d700012000000b0000
crw------- 1 root root 10, 63 Jul 25 22:48 control
xa-s03:~# dd if=/dev/mapper/600508b4000156c30001200000210000
of=/dev/null bs=1M count=500
500+0 records in
500+0 records out
524288000 bytes transferred in 5.662530 seconds (92589003 bytes/sec)
gee, that pretty fast :)
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* update the Makefiles to autodetect libgcc.a & gcc includes
"ulibc-style". Factorisation of udevdirs & others niceties
* drop a hint about absent /dev/sd? on failed open() for poor Debian
users who don't imagine their favorite distro with only 16 preconfigured
SCSI device nodes :)
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here is the next update which brings this multipath to the state i'm not
ashamed of it being in udev :)
* drop a libdevmapper copy in extras/multipath; maybe discussions w/
Sistina folks will bring a better solution in the future.
* drop a putchar usage in libdevmapper to compile cleanly with klibc
* drop another such usage of my own in main.c
* massage the Makefile to compile libdevmapper against klibc
* use "ld" to produce the binary rather than "gcc -static"
* stop being stupid w/ uneeded major, minor & dev in main.c:dm_mk_node()
* reverse to creating striped target for now because the multipath
target is more hairy than expected initialy
* push the version code to 009 to be in synch w/ udev
builds & run here.
binary size is 43ko, which is fairly gratifying after all the efforts
I've put to compiling it with klibc :)
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here is a clean-up patch :
* removes sg_err.[ch] deps
* makes sure the core code play nice with klibc
* port the sysfs calls to dlist helpers
* links against udev's sysfs (need libsysfs.a & dlist.a)
* finally define DM_TARGET as "multipath" as Joe posted the code today
(not tested yet)
* push version forward (do you want it in sync with udev version?)
libdevmapper doesn't play well with klibc, so I wasn't able to produce a
static binary yet. Help needed here ... as I don't want to fall back to
merge libdevmapper code in the core.
It compiles here and doesn't segfault.
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<christophe.varoqui@free.fr>
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