NeilBrown [Wed, 12 Jan 2011 23:44:52 +0000 (10:44 +1100)]
reshape_array: move lots of code out of a 'switch'.
Everything other than the 'child' part of the 'switch(fork)' returns
quickly, so leave them inside the switch but move the other large bit
out so as to make the flow of code more natural.
NeilBrown [Wed, 12 Jan 2011 23:39:34 +0000 (10:39 +1100)]
Fix up calls to unfrozen at end of reshape.
1/ don't pass 'frozen' as an arg to unfreeze - just use it
to conditionally call 'unfreeze'.
2/ Always unfreeze at end of reshape_container
3/ Only unfreeze at end of reshape_array if not 'forked'. So when
reshape_array is called from reshape_container it doesn't unfreeze,
but when called directly.
Adam Kwolek [Wed, 12 Jan 2011 23:16:07 +0000 (10:16 +1100)]
imsm: FIX: spares are not counted
Field info->array.spare_disks is used on begin of reshape_array() to
check if there is enough number of spares to process reshape. During
container_content_imsm() call spare disks are not counted. This
causes that reshape_array() reports that there is not enough spares to
execute reshape.
Patch adds spares counting for reshape process.
Signed-off-by: Adam Kwolek <adam.kwolek@intel.com> Signed-off-by: NeilBrown <neilb@suse.de>
Adam Kwolek [Wed, 12 Jan 2011 23:15:54 +0000 (10:15 +1100)]
FIX: Cannot load container information
When container is passed to grow_reshape(), load_container() function
has to be used to get all required information from metadata.
So load_super is never correct here - in particular, cfd is a
'container fd' so we must 'load_container' on it.
Signed-off-by: Adam Kwolek <adam.kwolek@intel.com> Signed-off-by: NeilBrown <neilb@suse.de>
Adam Kwolek [Wed, 12 Jan 2011 23:06:29 +0000 (10:06 +1100)]
imsm: FIX: old devices memory has to be released
When process_update() replaces memory for bigger devices, old memory
areas are collected in a list and has to be assigned in to pointer in
update for later release.
List created from old devices is created and attached to space_list
for later releasing.
Signed-off-by: Adam Kwolek <adam.kwolek@intel.com> Signed-off-by: NeilBrown <neilb@suse.de>
Adam Kwolek [Wed, 12 Jan 2011 23:05:31 +0000 (10:05 +1100)]
imsm: FIX: local mdadm update shouldn't be done in update creation function.
Local update is performed based on created update, so this code can broke
local update and it is not necessary as prepare and process update functions
are used.
Code removed.
Signed-off-by: Adam Kwolek <adam.kwolek@intel.com> Signed-off-by: NeilBrown <neilb@suse.de>
Adam Kwolek [Wed, 12 Jan 2011 23:04:33 +0000 (10:04 +1100)]
imsm: FIX: mdadm should process local data
When update is created by mdadm, local information should be updated
also. This makes us to prepare one update for mdmon and second
"update" to maintain local changes. we can use prepared update for
"local/mdadm" metadata update purposes.
We have 2 cases:
1. when metadata is updated by mdmon, we avoid metadata reloading in
mdadm.
we proceed the same updtate 2 times:
- one time in mdadm for "local update"
- second time in mdmon for real metadat update
2. when metadata is updated by mdadm (no mdmon running) updates are
processed in the same way.
- one time in mdadm for "local update"
- there is no "second time" update but mdadm just flushes
metadata to array
This let us to avoid code duplication by using prepare and process
update functions as for update via mdmon. This makes update
preparing mdmon independent and there is no need to maintain the
same thing in 2 places in code.
Signed-off-by: Adam Kwolek <adam.kwolek@intel.com> Signed-off-by: NeilBrown <neilb@suse.de>
Kwolek, Adam [Wed, 12 Jan 2011 10:42:44 +0000 (21:42 +1100)]
FIX: size is passed incorrectly
reshape_super() called from reshape_container() with size set to
info->component_size gives size in reshape_super == -2 due to unsigned
signed conversion (info->component_size is not initializes).
As size is not changed during container reshape '-1' value is passed
to indicate this.
Signed-off-by: Adam Kwolek <adam.kwolek@intel.com> Signed-off-by: NeilBrown <neilb@suse.de>
Anna Czarnowska [Tue, 11 Jan 2011 10:36:37 +0000 (11:36 +0100)]
Monitor: skip array if error getting size
load_super tries to load container first anyway but if it fails
eg. after physically removing a disk
then it tries to read metadata from container device.
This will always fail and print confusing errors.
So use load_container instead of load_super on container.
On failure to read metadata we should skip this array.
It will be dealt with the next time round.
Signed-off-by: Anna Czarnowska <anna.czarnowska@intel.com> Signed-off-by: NeilBrown <neilb@suse.de>
NeilBrown [Wed, 12 Jan 2011 04:59:24 +0000 (15:59 +1100)]
Don't complain about missing spares when reshaping a raid0.
To reshape a RAID0 we convert to RAID4 first. This makes it look
like it could be degraded and so we are tempted to ensure there are
enough spares. However this is not appropriate for RAID0, so
explicitly exclude new_level == RAID0 in this check
Reported-by: Adam Kwolek <adam.kwolek@intel.com> Signed-off-by: NeilBrown <neilb@suse.de>
Adam Kwolek [Wed, 12 Jan 2011 04:12:44 +0000 (15:12 +1100)]
imsm: FIX: update disks status in container_contents()
Based on status information disks are added to array during grow (in reshape_array()).
This information currently is not present and all disks (old and new) were added to md.
To avoid adding already present disks, disk.state has to be set.
Signed-off-by: Adam Kwolek <adam.kwolek@intel.com> Signed-off-by: NeilBrown <neilb@suse.de>
NeilBrown [Wed, 12 Jan 2011 03:46:17 +0000 (14:46 +1100)]
Make child_monitor a candidate for ->manage_reshape
Child_monitor was design to perform 'manage_reshape' for native
arrays. So change the signature for ->manage_reshape to match
child_monitor and move the all to the same place that child_monitor
is called from.
Also give super-intel a manage_reshape handler which simple calls
child_monitor.
NeilBrown [Wed, 12 Jan 2011 03:04:09 +0000 (14:04 +1100)]
Add comment about future enhancement
We currently suspend rather large sections of
the array which can take a while to process.
Possibly smaller sections are better. Possibly it should be
adjusted on a timeout basis.
NeilBrown [Tue, 11 Jan 2011 23:44:58 +0000 (10:44 +1100)]
Be more enthusiastic/flexible in backing up data.
At some points we need to perform 2 backups at once so as to
start the 'double buffering' approach. So rather than assuming
what the next backup should be, example suspend_point and backup
as much as possible up to there.
NeilBrown [Tue, 11 Jan 2011 23:40:56 +0000 (10:40 +1100)]
Fix issues with the finish of monitoring a reshape.
1/ We need to clean up the backup file after the reshape finishes.
2/ We need to remove the suspended region and clear the resync
controls after the resync finishes.
NeilBrown [Tue, 11 Jan 2011 23:37:26 +0000 (10:37 +1100)]
fix array_size in child_monitor
The array_size we need to consider is the largest possible size of the
array, which is a different calculation depending on whether the array
is growing or shrinking.
NeilBrown [Tue, 11 Jan 2011 23:34:44 +0000 (10:34 +1100)]
Fix calculations for max_progress and completed.
'sync_completed' can sometimes have a value which is slightly high.
So round-down relevant values to new-chunk size and that is what we
want.
Subtract from component_size after scaling down rather than before as
that is easier.
Make sure max_progress never goes negative when reshaping backwards.
NeilBrown [Tue, 11 Jan 2011 04:20:40 +0000 (15:20 +1100)]
Improve determination of when a backup is needed.
The current code is right.
Instead compute where we might eventually need to back up to, and
then compare that to how far we have progressed.
Also move suspend_point up towards where we might need to backup to,
rather than just as far as max_progress - as max_progress can never
exceed where we are currently suspended to.
NeilBrown [Tue, 11 Jan 2011 04:07:57 +0000 (15:07 +1100)]
Remove write_range from calculation of max_progress
It isn't needed as we always work in multiples of full
destination stripes.
Also multiply by 'after' disks, not before.
We can progress until the point we would write then lines up with
where we would read now.
We read now from
array-address: reshape_progress device-address: read_offset
So we write then to
device-address: read_offset array-address: read_offset * after.disks
NeilBrown [Tue, 11 Jan 2011 03:51:09 +0000 (14:51 +1100)]
Avoid confusing with 'blocks' number.
The 'blocks' number computed by analyse_change is the number of
blocks that it makes sense to back-up at a time.
It is the smallest number of blocks that is a whole number of
stripes in both the old and the new layout.
However we are also using it as the smallest amount of progress
that can be made at a time, which is wrong as it is always valid
to progress a single stripe in the new layout.
So change 'blocks' to be called 'backup_blocks' to make it more clear.
And pass new_chunk size down so it can be used for 'minimum forward
progress' calculations.
Also set 'stripes' (the amount actually backed up) from the
possibly-scaled 'blocks' number rather than ignoring it and using
backup_blocks.
Finally, get rid of 'read_range' as it isn't used (or needed).
NeilBrown [Tue, 11 Jan 2011 03:41:47 +0000 (14:41 +1100)]
Avoid double-unfreeze of arrays during grow.
Once we have called reshape_container or reshape_super we have handed
on the responsibility for unfreezing the array, so Grow_reshape
shouldn't call unfreeze.
NeilBrown [Tue, 11 Jan 2011 02:23:16 +0000 (13:23 +1100)]
Ensure start_reshape copes with unexpected state
We want start_reshape to work no matter what the current values
of suspend_lo/suspend_hi are. So initialise suspend_lo very high
as this allows suspend_hi to be set to anything.
Adam Kwolek [Thu, 6 Jan 2011 08:17:29 +0000 (19:17 +1100)]
Detect level change
For level migration support it is necessary to allow mdmon to react for level changes.
It has to have ability to change configuration of active array,
and for array level change to raid0 finish array monitoring.
Signed-off-by: Maciej Trela <maciej.trela@intel.com> Signed-off-by: Adam Kwolek <adam.kwolek@intel.com> Signed-off-by: NeilBrown <neilb@suse.de>
Adam Kwolek [Thu, 6 Jan 2011 07:42:53 +0000 (18:42 +1100)]
Add spares to raid0 in mdadm
When user wants to add spares to container with raid0 arrays only
it is not possible to update metadata due to lack of running mdmon.
To allow for this direct metadata update by mdadm is used in such case.
Signed-off-by: Krzysztof Wojcik <krzysztof.wojcik@intel.com> Signed-off-by: NeilBrown <neilb@suse.de>
Adam Kwolek [Thu, 6 Jan 2011 07:29:11 +0000 (18:29 +1100)]
imsm: FIX: Division by 0
For general migration function blocks_per_migr_unit() has to return valid value.
If there is no valid return, 0 is returned instead and causes division by 0 error.
Additionally guard in function was added for such case.
Signed-off-by: Adam Kwolek <adam.kwolek@intel.com> Signed-off-by: NeilBrown <neilb@suse.de>
Adam Kwolek [Thu, 6 Jan 2011 07:29:07 +0000 (18:29 +1100)]
imsm: Finalize reshape in metadata
When reshape is finished monitor calls set_array_state() and finishes migration in metadata.
This change allows for finishing metadata migration on reshape end.
Signed-off-by: Adam Kwolek <adam.kwolek@intel.com> Signed-off-by: NeilBrown <neilb@suse.de>
Adam Kwolek [Tue, 4 Jan 2011 14:36:57 +0000 (15:36 +0100)]
imsm: FIX: update first array in container only
During first metadata update imsm for compatibility reason should update
only one array.
Buffers in prepare_update() are prepared for second update as well.
Adam Kwolek [Thu, 6 Jan 2011 05:56:05 +0000 (16:56 +1100)]
FIX: get updated information from metadata
Metadata is not modified by metadata preparation handler.
It has to be read again from array.
There is 2 read required:
1. before 'for' entry to get updated information after reshape_super() call
2. inside 'for' loop to get updated information for every processed array
(it can happen /i.e. imsm case/ that container operation is a set of array operations
and information in metadata is changed after every loop).
Signed-off-by: Adam Kwolek <adam.kwolek@intel.com> Signed-off-by: NeilBrown <neilb@suse.de>
Adam Kwolek [Thu, 6 Jan 2011 05:24:07 +0000 (16:24 +1100)]
imsm: FIX: Perform first metadata update for container operation
Meta data was not updated due to the following problems:
1.disk index < 0 was treated as invalid, but this is spare device
2. disk index greater than currently used disks is correct also
3. newmap pointer has to be refreshed for second map copy operation
4. size calculation has to be guarded for shrinking operation
Signed-off-by: Adam Kwolek <adam.kwolek@intel.com> Signed-off-by: NeilBrown <neilb@suse.de>
Adam Kwolek [Thu, 6 Jan 2011 05:22:01 +0000 (16:22 +1100)]
imsm: FIX: display error message
When container operation is not allowed user has to get proper information on console about it
Currently this information was displayed as debug info only.
Signed-off-by: Adam Kwolek <adam.kwolek@intel.com> Signed-off-by: NeilBrown <neilb@suse.de>
Adam Kwolek [Thu, 6 Jan 2011 05:11:35 +0000 (16:11 +1100)]
imsm: FIX: display correct information for '-E' option
Correct information displayed by '-E' option.
1. FIX: Slot information during raid0 migration is displayed incorrectly
(missing disk position is taken from wrong map)
2. Improvement: information about (level, members, chunk size) migration is displayed.
Signed-off-by: Adam Kwolek <adam.kwolek@intel.com> Signed-off-by: NeilBrown <neilb@suse.de>
NeilBrown [Thu, 6 Jan 2011 04:58:32 +0000 (15:58 +1100)]
Refactor reshape monitoring.
Combine all the non-backing-up code into a single function:
progress_reshape. It is called repeatedly to monitor a
reshape and allow it to happen safely.
Have a single separate function 'child_monitor' which
performs backups of data and calls progress_reshape to
wait for the next backup to be needed.
Anna Czarnowska [Wed, 5 Jan 2011 03:42:27 +0000 (14:42 +1100)]
Incremental: move suitable spares to container when subarrays started.
By default Incremental places all imsm spares in separate container
with uuid=0:0:0:0. (patch giving spares uuid_zero needed)
When we find enough members to start an array
we are able to determine domain so we search spare container
for suitable spares and move them to the container that
is currently assembled.
Signed-off-by: Anna Czarnowska <anna.czarnowska@intel.com> Signed-off-by: NeilBrown <neilb@suse.de>
Anna Czarnowska [Wed, 5 Jan 2011 02:54:18 +0000 (13:54 +1100)]
Assemble: allow to assemble spares on their own
If we find spares but no members of given array
we create container with just spares.
This allows auto assemble to pick up all lose imsm spares when there
is no config file.
When there is a valid config file and any array is assembled from it
we don't try auto assembly so we will not assemble spares that don't
match any array.
To remedy this we must add
ARRAY metadata=imsm UUID=00000000:00000000:00000000:00000000
to config file.
This container will include all remaining spares.
Signed-off-by: Anna Czarnowska <anna.czarnowska@intel.com> Signed-off-by: NeilBrown <neilb@suse.de>
Anna Czarnowska [Wed, 5 Jan 2011 02:42:59 +0000 (13:42 +1100)]
Assemble: we need to read policy to know array domains
Policy must be read on all disks identified as array members
to get array's domains list.
Currently it is only read on first array member in auto assembly mode.
Signed-off-by: Anna Czarnowska <anna.czarnowska@intel.com> Signed-off-by: NeilBrown <neilb@suse.de>
Validate size of potential spare disk for external metadata (with containers)
mdinfo read with sysfs_read do not contain information about the space
needed to store data of all volumes created in that container, so that
spare can be used as replacement for existing subarrays in the future.
If lost disk was the only one that belonged to particular domain, array
won't match with that domain any longer. We can achieve this by moving
domain check below the 'target' test.
Added test for array degradation for spare-same-slot
spare-same-slot allows re-adding of missing array member with disk
re-inserted into the same slot where previous member was plugged in.
If in the meantime another spare has been used for recovery, same slot
cookie should be ignored.
external: get number of failed disks for container
Container degradation here is defined as the number of failed disks in
mostly degraded sub-array. This number is used as value for
array.failed_disks and used in comparison to find best match.
Anna Czarnowska [Sun, 26 Dec 2010 11:08:51 +0000 (22:08 +1100)]
Assemble imsm spares in matching domain only
Imsm spare will only be taken if it matches domain of
identified members of currently assembled array.
This implies that:
- spare with null domain will match first array assembled.
- if array has null domain then no spare will match
If we allow spares to set st they may block assembly of subarrays.
This is because in auto-assembly tmpdev->used=0 for a spare not matching
any array. If we find such spare before container and set st, the content
will not get assembled.
We allow uuid_zero match any uuid in assembly as unsuitable spares will
be rejected on domain check.
Signed-off-by: Anna Czarnowska <anna.czarnowska@intel.com> Signed-off-by: NeilBrown <neilb@suse.de>
Krzysztof Wojcik [Sun, 26 Dec 2010 10:59:14 +0000 (21:59 +1100)]
Enable tests for OLCE, takeover, migrations for imsm metadata
Patch provides set of tests for On-line Capacity Expansion,
takeover, migrations operations for imsm metadata type.
Tests are grouped by operation type:
12 - On-line Capacity Expansion on one volume
13 - On-line Capacity Expansion on two volumes
14 - Negative tests for takeover, migrations
15 - Chunk size migrations
16 - raid0 -> raid5, raid5 -> raid0 migrations
18 - takeover operations
To run particular test group, following command should be executed:
(from mdadm's source code root directory)
./test <group number>
Example:
To run On-line Capacity Expansion on one volume tests:
./test 12
Tests execution results:
- In case of test pass, "succeeded" word is printed on console
- If test is failed, "FAILED" word is printed on console
and logs are stored in <mdadm-root-dir>/tests/log/ directory
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com> Signed-off-by: Krzysztof Wojcik <krzysztof.wojcik@intel.com> Signed-off-by: NeilBrown <neilb@suse.de>
Krzysztof Wojcik [Thu, 16 Dec 2010 13:34:54 +0000 (14:34 +0100)]
FIX: Bad block verification during assembling array
We need to refuse to assemble an arrays with bad blocks.
Initially there was condition in container_content function
that returns error value in the case when metadata store information
about bad blocks.
When the container_content function is called from functions NOT connected
with assemble (Kill_subarray, Detail) we get faulty error return value.
Patch introduces new flag in array.status - MD_SB_BBM_ERRORS. It is set
in container_content when bad blocks are detected and can be checked by
container_content caller.
Signed-off-by: Krzysztof Wojcik <krzysztof.wojcik@intel.com> Signed-off-by: NeilBrown <neilb@suse.de>
fix: incremental for bare disks returns invalid value
return value should remain the same as result of Manage_Subdevs (last
significant operation). Right now it is inverted what results in
error status for successful operation.
fix: adding spare via incremental do not trigger recovery
After incremental has added spare, monitor should be woken up in order
to see if anything has changed. If mdmon is not waken up, recovery do not
start.
Adam Kwolek [Thu, 16 Dec 2010 04:48:27 +0000 (15:48 +1100)]
imsm: Do not indicate resync during reshape
If reshape is started resync is not allowed in parallel. This would
break reshape. If array is in General Migration state do not indicate
resync and allow for reshape continuation.
Signed-off-by: Adam Kwolek <adam.kwolek@intel.com> Signed-off-by: NeilBrown <neilb@suse.de>
Adam Kwolek [Thu, 16 Dec 2010 02:17:45 +0000 (13:17 +1100)]
imsm: Process reshape_update in mdmon
For this update prepare_update() allocates memory to relink imsm
(bigger) device imsm structures. It calculates new /bigger/ anchor
size.
Process update applies update in to imsm structures. This includes
- converting selected spares into configured devices
- marking the arrays as migrating
- making a new 'map' for each array with the changed details.
Signed-off-by: Adam Kwolek <adam.kwolek@intel.com> Signed-off-by: NeilBrown <neilb@suse.de>
NeilBrown [Thu, 16 Dec 2010 01:10:01 +0000 (12:10 +1100)]
Allow a metadata update to have a linked list of allocated spaces.
Sometimes one metadata update will require allocating several
larger data structures. As 'monitor' cannot allocate, 'manager'
must, so it must be able to attach a list of allocates to the
update, and importantly it must be able to easily free them.
So add a 'space_list' element to metadata updates where each
element on the list starts with a pointer to the next.
NeilBrown [Thu, 16 Dec 2010 00:45:21 +0000 (11:45 +1100)]
imsm: Prepare reshape_update in mdadm
During Online Capacity Expansion metadata has to be updated to show
array changes and allow for future assembly of array. To do this
mdadm prepares and sends reshape_update metadata update to mdmon.
The update contains the old and new number of raid disks, and the
indices of the spare disks that will be used to fill the spaces.
This works as follows:
1. reshape_super() prepares metadata update.
2. mdadm discovers the spares and adds them to the array
3. mdadm sends the update to mdmon
4. managemon in prepare_update() allocates required memory for bigger
device object
5. monitor in process_update() updates the metadata to record the
new sizes and the newly assigned devices.
6. mdadm initiates the reshape
Based on code From: Adam Kwolek <adam.kwolek@intel.com>
Signed-off-by: Krzysztof Wojcik <krzysztof.wojcik@intel.com> Signed-off-by: Adam Kwolek <adam.kwolek@intel.com> Signed-off-by: NeilBrown <neilb@suse.de>
NeilBrown [Wed, 15 Dec 2010 22:07:52 +0000 (09:07 +1100)]
mdmon: when a reshape is detected, add any newly added devices to the array.
When mdadm starts a reshape, it might add some devices to the array
first. mdmon needs to notice the reshape starting and check for any
new devices. If there are any they need to be provided to be
monitored.
NeilBrown [Wed, 15 Dec 2010 22:07:52 +0000 (09:07 +1100)]
Grow: add disks chosen by metadata handler to array for growth.
With externally managed container based metadata, the ->reshape_super
method must choose any spares that are to be added to the array.
They should be prepared so that ->container_content will find them
as spares (disk.state == 0) which are assigned to a slot
(raid_disk >= 0).
We need to take those and add them to the array(s).
NeilBrown [Wed, 15 Dec 2010 22:07:52 +0000 (09:07 +1100)]
Grow: split out start_reshape for initiating reshape via sysfs.
Rather than sprinkling various sysfs setting around, put them all
in one place. This will make implementing ->manage_reshape easier.
This changes behaviour slightly.
Previously we would not set 'sync_action' to 'reshape' until we were
ready for the process to start. Now we set sync_max to zero and set
sync_action to 'reshape' at that time. When we want reshape to
actually start we advance sync_max.
NeilBrown [Wed, 15 Dec 2010 22:07:51 +0000 (09:07 +1100)]
Grow: be more careful about metadata updates.
1/ When we sunc_metadata, we must reset ->update_tail else
future metadata updates might go direct to the device bypassing
mdmon.
2/ When converting to an array with redundancy so we can add disks
it is neater to sync_metadata before starting mdmon rather that
artificially setting update_tail early.
projects / thirdparty / mdadm.git / log
