When rebuilding the mapfile (mdadm -Ir), if not appropriate name is
found in /dev/md/, try to find an appropriate name, either by looking
in mdadm.conf or by using the name in the metadata.
Signed-off-by: NeilBrown <neilb@suse.de>
If mdadm.conf contains
HOMEHOST <ignore>
or commandline contains
--homehost=<ignore>
then the check that array metadata mentions the given homehost is
replace by a check that the name recorded in the metadata is not
already used by some other array mentioned in mdadm.conf.
This allows more arrays to use their native name rather than having
an _NN suffix added.
This should only be used during boot time if all arrays required for
normal boot are listed in mdadm.conf.
If auto-assembly is used to find all array during boot, then the
HOMEHOST feature should be used to ensure there is no room for
confusion in choosing array names, and so it should not be set
to <ignore>.
Signed-off-by: NeilBrown <neilb@suse.de>
Because ---examine --brief, or --detail --brief are
often used to create mdadm.conf, and because people don't want to
have to update their mdadm.conf unnecessarily, we don't want to
include information that might change.
And now that level changing is supported, that is almost everything
but UUID.
So move some more fields into the "Only print with --verbose" class.
Signed-off-by: NeilBrown <neilb@suse.de>
The line 'auto' in mdadm.conf can be used to disable assembly
of specific metadata types, or of all arrays.
This does not affect assembly of arrays listed in mdadm.conf
or on command line.
auto -all
will disable all auto-assembly.
auto -ddf
will cause mdadm to ignore ddf arrays that are not explicitly
mentioned, and auto assemble anything else it finds.
Signed-off-by: NeilBrown <neilb@suse.de>
This patch enables the --size parameter for build operations.
Without this, if you have a raid1, for instance, where the 2 disks are
not the exact same size, and you need to build the array but one of the
disks is not available right at the moment (maybe it's USB and it's
unplugged, or maybe it's a network disk and it's unavailable), then you
have to play some weird games to get the array to size correctly (that
is, to the size of the smaller of the two components or less).
There may be other uses for this too...
--
Paul
Signed-off-by: NeilBrown <neilb@suse.de>
When building container members with -IR, we need to ensure that
devices added to an active array preserve the 'in_sync' status so they
don't needlessly get rebuilt.
So allow sysfs_add_disk to do this (only works in kernels since
2.6.30) and pass the relevant flag down.
Signed-off-by: NeilBrown <neilb@suse.de>
For short reshapes the kernel may be done before mdadm can check that
progress has passed the critical section.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
imsm arrays round down the effective array size to the closest 1
megabyte boundary so teach get_info_super_imsm and sysfs_set_array to
set 'md/array_size' if available (and make sure ddf uses the default
size).
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
wait not only for the name to appear, but for it to refer to the
correct device.
Sometimes old symlinks left lying around can be confusing.
Signed-off-by: NeilBrown <neilb@suse.de>
If an array reshape completed within 1 second, then --grow will not
notice that it has finished and will keep waiting for the critical
section to pass.
So be more cautious in the test.
Signed-off-by: NeilBrown <neilb@suse.de>
DDF raid6 layouts are subtly different from the standard 'md' layouts.
From 2.6.30 the kernel knows about these.
Teach mdadm about them, and also allow 'ddf' to set an appropriate default.
Signed-off-by: NeilBrown <neilb@suse.de>
All operations that rely on loading from an existing container (like
--add) will fail after a disk has been removed. Provide an option to
skip missing / offline disks rather than abort. We attempt to do this
in the load_super_{imsm,ddf}_all cases when mdmon is running i.e. we
already have a consitent version of the metadata running in the system.
Otherwise, we fail as normal and let the administrator fix up the
container.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2008-12-08 Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
* Makefile (dadm.uclibc): Remove misspelled and unneeded rule.
* md5.h: Include stdint.h for uClibc.
* mdadm.h: uClibc defines __UCLIBC__. If uClibc has LFS off
then use lseek instead of lseek64.
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
If the metadata handler can not find its platform support components
then there is no way for it to verify that the raid configuration will
be supported by the option-rom. Provide a generic method for metadata
handlers to warn the user that the array they are about to create may
not work as intended with a given platform.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Let handlers specifiy their own defaults, specifically needed for the
imsm-raid5 case where mdadm defaults to 'ls' and imsm to 'la'.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Metadata formats like imsm work in concert with platform firmware and
hardware, so provide a way for mdadm to display this info to the user.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
If, when creating an array, a signal target device is given which
is a container, then allow the metadata handler to choose which
devices to use.
This is currently only supported for DDF.
Signed-off-by: NeilBrown <neilb@suse.de>
Now that names in /dev are usually created (eventually) by udev,
it isn't really safe to rely in finding a name in /dev to pass to
mdmon to identify which array to monitor.
And it isn't really necessary to have a name in /dev.
So just pass the symbolic name, e.g. md127 or md123.
Change util.c to pass that name, and change mdmon to process the
name sensibly.
Signed-off-by: NeilBrown <neilb@suse.de>
It is possible for the mapfile to become wrong, and that gets
very confusing. So validate entries before returning them.
Signed-off-by: NeilBrown <neilb@suse.de>
Rather than appending the md minor number, we now append a small
sequence number to make sure name in /dev/md/ that aren't LOCAL are
unique. As the map file is locked while we do this, we are sure
of no losing any races.
Signed-off-by: NeilBrown <neilb@suse.de>
Try to treat members of containers much like other arrays for
assembly.
We still look through the list of devices for a match (it will be
the container), then find the relevant 'info' and try to assemble
the array.
Signed-off-by: NeilBrown <neilb@suse.de>
Factor out, from Incremental_container, the code for assembling an
array based on information extracted from a container. We will
shortly use this from Assemble too.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This only applies if udev isn't installed or is disabled
by MDADM_NO_UDEV
We try to remove partitions too.
We find names to remove by looking in /var/run/mdadm/map
Signed-off-by: NeilBrown <neilb@suse.de>
When a 'container' gets started, we need udev to notice, but the
kernel has no way of knowing that a KOBJ_CHANGE event is needed. So
send one directly via the 'uevent' sysfs attribute.
Also, uevents don't get generated when md arrays are stopped (prior to
2.6.28) so send 'change' events then too.
Signed-off-by: NeilBrown <neilb@suse.de>
When mdadm.conf is automatically generated, we might not know a
suitable /dev/name. But we do know the uuid of the container.
So allow that as an option.
Signed-off-by: NeilBrown <neilb@suse.de>
Change the "env_check_mdmon" function to be more generic, accepting
and environment variable name, as soon we will have a new use for it.
Signed-off-by: NeilBrown <neilb@suse.de>
We will shortly be feeding more information into the process of
creating array devices, so delay the creation. Still open them
early if the device already exists.
This involves making sure the autof flag is in the right place
so that it can be found at creation time.
Also, Assemble, Build, and Create now always close 'mdfd'.
Signed-off-by: NeilBrown <neilb@suse.de>
This reflect that fact that more often than not it is creating things
in /dev, and allows for a new open_mddev which does just that.
Signed-off-by: NeilBrown <neilb@suse.de>
Given an mdadm.conf like the following allow /dev/imsm and /dev/md/r1 to be
created by "mdadm -As".
DEVICES partitions
ARRAY /dev/imsm metadata=imsm auto=md UUID=b98f5dbe-aa859e7b-0e369b89-a80986d4
ARRAY /dev/md/r1 container=/dev/imsm member=0 auto=mdp UUID=3538e39c-b397c2e9-1aa031f9-2bc0eca4
spares=1
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Previously it was possible to set the WRITEMOSTLY flag when
adding a device to an array, but not to clear the flag when re-adding.
This is now possible with --readwrite.
Signed-off-by: NeilBrown <neilb@suse.de>
The uuid returned for an imsm spare device will never match the uuid of an
active disk. So make mdadm interpret a uuid of all f's as "match any".
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
When arrays do not startup correctly it would be nice to know why. Need
to move the dprintf definition to mdadm.h
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Showing e.g.
near=1, far=2
for the 'far2' layout of raid10 is confusing even though there is a
sense in which is it correct.
Make it less confusing by only printing whichever number is not 1.
If both are 1, make that clear too (i.e. no redundancy).
When adding a device to an array, we check that it is large enough.
Currently the check makes sure there is also room for a reasonably
sized bitmap. But if the array doesn't have a bitmap, then this test
might be too restrictive.
So when adding, only insist there is enough space for the current
bitmap.
When Creating, still require room for the standard sized bitmap.
This resolved Debian Bug 500309
For now, this means that the lack of a homehost doesn't always prevent
assembly.
Soon we will allow assembly anyway, but have different messages if
homehost isn't supported.
mdadm -I /dev/part-of-container
should add that to a container, creating if it needed,
and then try to assemble any arrays in the container.
Signed-off-by: NeilBrown <neilb@suse.de>
When we assemble an array, there are three different approaches
depending on whether metadata is internal or external, and on
kernel version.
Move all this to a common helper instead of duplicating in 3 places.
Signed-off-by: NeilBrown <neilb@suse.de>
The variety of approaches to 'add_disk' are factored out into
a separate function, and Incremental mode benefits by being
closer to supporting the assembly of containers.
Also remove the adding-to-array-data-structure out of sysfs_add_disk
and into add_disk.
And add some tests for --incremental mode to make sure we don't break it.
Signed-off-by: NeilBrown <neilb@suse.de>
Make --detail on a container more useful by suppressing irrelevant
detail and adding useful detail like a list of member arrays.
Ditto for members of a container: report the name of the container
array.
Signed-off-by: NeilBrown <neilb@suse.de>
For use in distro shutdown scripts with a RAID root file system.
Returns immediately if the array is 'readonly', or not an externally
managed array. It is up to the distro's scripts to make sure no new
writes hit the device after this returns 'true'.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
The action we are waiting for may not be complete until the monitor has
had a chance to take action on the result.
The following script can now remove the device on the first attempt,
versus a few attempts with the original Wait():
#!/bin/bash
#export MDADM_NO_MDMON=1
export IMSM_DEVNAME_AS_SERIAL=1
./mdadm -Ss
./mdadm --zero-superblock /dev/loop[0-3]
echo 2 > /proc/sys/dev/raid/speed_limit_max
./mdadm --create /dev/imsm /dev/loop[0-3] -n 4 -e imsm -a md
./mdadm --create /dev/md/r1 /dev/loop[0-3] -n 4 -l 5 --force -a mdp
./mdadm --fail /dev/md/r1 /dev/loop3
./mdadm --wait /dev/md/r1
x=0
while ! ./mdadm --remove /dev/imsm /dev/loop3 > /dev/null 2>&1
do
x=$((x+1))
done
echo "removed after $x attempts"
./mdadm --add /dev/imsm /dev/loop3
Include 2 small cleanups:
* remove the almost open coded fd2devnum() in Wait() by introducing a
new utility routine stat2devnum()
* teach connect_monitor() to parse the container device from a subarray
string
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
If the metadata_version is
-mdXXX/whatever
rather than
/mdXXX/whatever
then the array is readonly and should be left alone by mdmon.
Signed-off-by: NeilBrown <neilb@suse.de>
We are about to change the syntax of the version string
for 'subarray's. So factor out the test into a single function.
Signed-off-by: NeilBrown <neilb@suse.de>
When we first start an array, it might be good to start recovery
straight away. That requires setting the array to 'dirty', but
only the metadata handler can know if that is required or not.
So have a third possible 'consistent' option to set_array_state.
Either 'no' or 'yes' or 'you choose'.
Return value indicates what was chosen.
'1' (no) should be chosen unless there is a good reason.
Signed-off-by: NeilBrown <neilb@suse.de>
Transition readauto arrays to active before failing drives.
Hmm... why do we keep reblocking / renotifying in the readonly case?
Need to bottom out on this, but not right now.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
The cmd_filter patch merged for 2.6.27 broke retrieving the serial
number via an ioctl to /dev/sgN. In debugging this I found that other
utilities like sdparm simply run the ioctl on /dev/sdX. So just convert
to that for protection in numbers, but scream on the mailing list for
the inconvenience grr...
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Using buffered IO risks non-atomic updates to parts of the
device that we don't actually want to write to. This isn't in
general safe.
So switch to O_DIRECT for all that IO and make sure we have
properly aligned buffers.
The returned value was never used, and we don't really want
this return path anyway as writing to a pipe could conceivably
block, and the monitor must not block.
This really should be done in mdadm, not mdmon.
We ensure the device won't be suddenly commited as a hot-spare
using O_EXCL, then check the 'holders' sysfs directory
to make sure it is only in use once.
When loading the metadata for a subarray (super_by_fd), we set
->subarray to be the name read from md/metadata_version so that
getinfo_super can return info about the correct array.
With this we can differentiate between a container and
an array within the container by looking at ->subarray[0].
Only one superswitch should be externally visible for each
general type. Others which handle different flavours
(e.g. container/data-array) should be internal only.
Code in manager can now just call queue_metadata_update with a
(freeable) buf holding the update, and it will get passed to the
monitor and written out.
'container_member' isn't really a well defined concept.
Each metadata might enumerate members differently, so just
let each format /mdX/YYYY as appropriate.
I want the metadata handler to have more control over the 'version',
particularly for arrays which are members of containers.
So discard st->text_version and instead use info->text_version
which getinfo_super can initialise.