Hi Christophe,
here are the patches which I've queued up during SLES12 development.
Most of them are (more or less) obvious bugfixes, but there are some
things which would warrant a deeper review:
- device-mapper cookie handling: This _really_ is an arcane topic,
and I would love to have someone from the device-mapper team
to review it. I'm still facing some issues where udev emits
a warning 'conflicting device node /dev/mapper/XXX ..', so
there might be some issue with it.
- Asynchronous configuration: On large systems configure() as
being called during multipathd startup might exceed the systemd
job timeout, resulting in multipathd being killed by systemd.
For that I've been implementing an udev retrigger method, which
just issues an 'add' event for all available block devices.
- Related to the above: I've implemented an asynchronous 'reconfigure'
CLI call, as for the same reason systemd might kill the multipathd
during a 'restart' operation
- systemd/udev integration: This is _a pain_. It took me months to
come up with a working solution. _Especially_ as apparently RH
is shipping an '11-dm-multipath.rules' udev ruleset for multipathd,
which supposedly should be handling this.
It didn't do it for me, though, so I've attached my own version here.
The udev integration I've been settling for works like this:
- 11-dm-mpath.rules checks if the device is eligible for multipathing
For that I've implemented a new option '-u' which looks at the
uevent variables _only_.
- if a device should be handled by multipathing the 'by-id' and
'by-uuid' persistent symlinks are _not_ generated, as this would
trigger systemd to start scanning/mounting/lvm activation/whatnot;
the 'by-id' and 'by-uuid' symlinks are only generated for the
multipath devices themselves.
- I've added a new multipath.rules file which should be inserted between
55-scsi-sg3_id.rules and 58-scsi_sg3_symlink.rules. This will
intercept the SCSI IDENT variables and blank them out if the (block)
device is handled by multipathing.
- sysfs VPD page handling. I've planned to implement this as a direct
replacement of the original scsi_id program, but then it turned out
that our WWID handling is actually too generic for that: Both getuid
and uid_attribute can basically take _any_ value, so it's impossible
to tell if the system uses the original (scsi_id compatible) IDs or
not. And as the VPD parsing code can only generate scsi_id compatible
IDs we might run into compability issues.
So it's disabled per default. I'd really would like to clean it up,
as I suspect that about 95% of the installations are using scsi_id
compatible IDs. But for this to happen we need to clarify/restrict
the ID generation mechanism.
As usual, comments and reviews are welcome.
The patchset is based upon the 'find_multipaths' patchset from
Ben Marzinski; it can be retrieved from
github.com:/hreinecke/multipath-tools.git branch suse-resync
Cheers,
Hannes
Hannes Reinecke (78):
libmultipath: remove compilation warning in devmapper.c
mpath_persist: Do not call exit() from a shared library
libmultipath: filter for missing property in get_refwwid()
Double uevent stacksize yet again
discovery: do not fail discovery on individual devices
libmultipath: Prefer deprecated 'getuid' callout
libmultipath: Skip paths with empty wwid
Make systemd installation path configurable
Add multipath rules for systemd support
Fixup multipathd.socket to resolve ordering dependeny
Fixup dependencies in multipathd.service
multipathd: set correct PID when running in debug mode
Do not print empty device strings during discovery
kpartx.rules: do not call blkid
Use 'SCSI_IDENT_.*' as the default property whitelist
Fixup wwid blacklist printing
Allow for empty path argument when printing information
Disable reassign maps per default
multipathd: implement 'list path <path>' cli command
Make checker_put() and prio_put() idempotent
Remove trailing linefeed from sysfs attributes
multipath: implement option '-u' for uevents
Install multipath rule under '56-multipath.rules'
multipath.rules: Whitelist devices
multipath.rules: fixup race condition with systemd
11-dm-mpath.rules: Import blkid values if all paths are down
kpartx.rules: Skip kpartx for multipath events
multipathd: handle DOMAP_RETRY
multipathd: cleanup foreground operation
Update hwtable for EMC XtremIO
multipath: check for running daemon when called with '-u'
Revert 'return PATH_DOWN for quiesced paths'
Do not treat 'transport-offline' paths as 'offline'
Check for valid DM_DEVICE_INFO before proceeding
Separate out uevent parsing functions
Use poll() when receiving uevents
mpath_persist: cleanup
kpartx: use standard 'major' and 'minor' macros
multipath: Use standard 'major' macro
Remove sysfs_get_dev
Add paths with a size of '0' as 'ghost' paths
Remove last argument from verify_paths()
Fixup device-mapper 'cookie' handling
multipath: do not print state 'orphan' for option '-l'
Return error when receiving CLI packet
Implement 'uxsock_timeout' keyword
Do not print empty multipaths section
multipathd: reload map if reinstate failed
multipathd: do not remove paths without uevents
Allow zero-sized devices during configuration
Rework uev_add_path()
multipathd: Issue warning on CLI command timeout
Use strlen() when checking for valid wwid
multipathd: Use standard lists for CLI handling
uxlsnr: use typedef for trigger function
multipathd: lock cli client list
multipath: enable sync support
Remove dm_udev_XXX wrapper functions
Revert to ACT_RELOAD in domap if the map exists
multipathd: use local variable for watchdog configuration
Ignore devices when sysfs_get_tgt_nodename fails
Skip USB devices during discovery
Read wwid from sysfs vpg_pg83 attribute
Assign local priority for NAA VPD descriptor
Use sysfs attribute vpd_pg80 to read serial number
Update multipath.conf.5 to clarify wwid generation
libmultipath: Fall back to SG_IO if no UID could be assigned
libmultipath: unset 'uid_attribute' on failure
Separate out vpd parsing functions
multipathd: use SG_IO as fallback to generate uid
Do not automatically fall back to vpd uid generation
libmultipath: make vpd page 0x80 optional
multipathd: push down lock in checkerloop()
Allow specific CLI commands to run unlocked
Push down vector lock during uevent processing
multipathd: timeout CLI commands when waiting for lock
multipathd: asynchronous configuration
multipathd: trigger all devices on startup
Makefile.inc | 8 +-
kpartx/devmapper.c | 53 +++-
kpartx/devmapper.h | 11 +-
kpartx/kpartx.c | 35 +--
kpartx/kpartx.rules | 10 +-
libmpathpersist/mpath_persist.c | 172 ++++++-----
libmpathpersist/mpath_updatepr.c | 20 +-
libmpathpersist/mpathpr.h | 3 +-
libmultipath/blacklist.c | 8 +-
libmultipath/blacklist.h | 2 +-
libmultipath/checkers.c | 2 +-
libmultipath/config.c | 2 +
libmultipath/config.h | 8 +-
libmultipath/configure.c | 82 ++++--
libmultipath/defaults.h | 4 +-
libmultipath/devmapper.c | 77 +++--
libmultipath/devmapper.h | 4 +-
libmultipath/dict.c | 33 +++
libmultipath/discovery.c | 613 ++++++++++++++++++++++++++++++++++-----
libmultipath/discovery.h | 8 +-
libmultipath/hwtable.c | 13 +
libmultipath/list.h | 49 +++-
libmultipath/lock.h | 4 +-
libmultipath/log_pthread.c | 2 +-
libmultipath/print.c | 20 +-
libmultipath/prio.c | 4 +-
libmultipath/propsel.c | 6 +-
libmultipath/structs_vec.c | 29 +-
libmultipath/structs_vec.h | 2 +-
libmultipath/sysfs.c | 53 ++++
libmultipath/sysfs.h | 2 +
libmultipath/uevent.c | 316 ++++++++++++--------
libmultipath/uxsock.c | 32 +-
libmultipath/uxsock.h | 4 +-
multipath.conf.defaults | 2 +-
multipath/11-dm-mpath.rules | 8 +-
multipath/Makefile | 2 +
multipath/dev_t.h | 3 -
multipath/main.c | 53 +++-
multipath/multipath.8 | 6 +-
multipath/multipath.conf.5 | 42 ++-
multipath/multipath.rules | 14 +
multipathd/cli.c | 47 ++-
multipathd/cli.h | 4 +-
multipathd/cli_handlers.c | 64 +++-
multipathd/cli_handlers.h | 1 +
multipathd/main.c | 400 ++++++++++++++++---------
multipathd/main.h | 2 +
multipathd/multipathd.service | 4 +-
multipathd/multipathd.socket | 8 +-
multipathd/uxclnt.c | 26 +-
multipathd/uxclnt.h | 2 +-
multipathd/uxlsnr.c | 102 +++++--
multipathd/uxlsnr.h | 8 +-
54 files changed, 1834 insertions(+), 655 deletions(-)
delete mode 100644 multipath/dev_t.h
create mode 100644 multipath/multipath.rules
--
1.8.4.5
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