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Now that I am using white-space mode in Emacs I can see all of this,
and I don't like it :-)
Signed-off-by: NeilBrown <neilb@suse.de>
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We widely use a "devnum" which is 0 or +ve for md%d devices
and -ve for md_d%d devices.
But I want to be able to use md_%s device names.
So get rid of devnum (a number) and use devnm (a 32char string).
eg.
md0
md_d2
md_home
Signed-off-by: NeilBrown <neilb@suse.de>
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Using takeover operation for grow purposes, mdadm has to be sure
that mdmon processes all updates, and if necessary it will be closed
at takeover to raid0 operation. If mdmon is late, next array in container
is processed and due to race condition mdmon closes itself instead to monitor
next reshape operation.
Signed-off-by: Adam Kwolek <adam.kwolek@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
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When for ping_monitor() input devnum2devname() is used,
received string pointer should be passed to free() for memory release.
It is not made in several places. This use case should have function
to avoid memory leak.
Signed-off-by: Adam Kwolek <adam.kwolek@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
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Put code for blocking subarray in to separate function.
This little code/function will be used for blocking arrays from mdmon
monitoring during assembly process. Arrays cannot wait for container
assembly finish, because meanwhile monitor can enable arrays for writing.
Signed-off-by: Adam Kwolek <adam.kwolek@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
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In order to support reshape and atomic removal of spares from containers
we need to prevent mdmon from activating spares. In the reshape case we
additionally need to freeze sync_action while the reshape transaction is
initiated with the kernel and recorded in the metadata.
When reshaping a raid0 array we need to freeze the array *before* it is
transitioned to a redundant raid level. Since sync_action does not exist
at this point we extend the '-' prefix of a subarray string to flag
mdmon not to activate spares.
Mdadm needs to be reasonably certain that the version of mdmon in the
system honors this 'freeze' indication. If mdmon is not already active
then we assume the version that gets started is the same as the mdadm
version. Otherwise, we check the version of mdmon as returned by the
extended ping_monitor() operation. This is to catch cases where mdadm
is upgraded in the filesystem, but mdmon started in the initramfs is
from a previous release.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
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Connect to the monitor in the old namespace and use that connection for
WaitClean requests when stopping the victim mdmon instance. This allows
ping_monitor() to work post chroot().
Cc: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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It is currently possible to remove a device and re-add it without the
manager noticing, i.e. without detecting a mdstat->devcnt
container->devcnt mismatch. Introduce ping_manager() to arrange for
mdmon to run manage_container() prior to mdadm dropping the exclusive
open() on the container. Despite these precautions sysfs_read() may
still fail. If this happens invalidate container->devcnt to ensure
manage_container() runs at the next event.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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More here
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Data is being passed in shared memory, so the pipe is only being
use as a wakeup. This can more easily be done with a thread-signal.
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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.
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From: Dan Williams <dan.j.williams@intel.com>
Each md_message encapsulates a single command. A command includes an 'action'
member which describes what if any data comes after the action. Communication
with the monitor involves updating the active_cmd pointer and then writing to
mgr_pipe. Pass/fail status is returned via mon_pipe.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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From: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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From: Dan Williams <dan.j.williams@intel.com>
1/ Block attempts to add/remove devices from container members
2/ Forward add/remove requests to containers
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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