'GPL-2.0-only' is used instead of 'GPL-2.0' because SPDX has
deprecated its use.
Suggested-by: John Wiele <[email protected]>
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
On dm-raid table load (using raid_ctr), dm-raid allocates an array
rs->devs[rs->raid_disks] for the raid device members. rs->raid_disks
is defined by the number of raid metadata and image tupples passed
into the target's constructor.
In the case of RAID layout changes being requested, that number can be
different from the current number of members for existing raid sets as
defined in their superblocks. Example RAID layout changes include:
- raid1 legs being added/removed
- raid4/5/6/10 number of stripes changed (stripe reshaping)
- takeover to higher raid level (e.g. raid5 -> raid6)
When accessing array members, rs->raid_disks must be used in control
loops instead of the potentially larger value in rs->md.raid_disks.
Otherwise it will cause memory access beyond the end of the rs->devs
array.
Fix this by changing code that is prone to out-of-bounds access.
Also fix validate_raid_redundancy() to validate all devices that are
added. Also, use braces to help clean up raid_iterate_devices().
The out-of-bounds memory accesses was discovered using KASAN.
This commit was verified to pass all LVM2 RAID tests (with KASAN
enabled).
Cc: [email protected]
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
If fast table reloads occur during an ongoing reshape of raid4/5/6
devices the target may race reading a superblock vs the the MD resync
thread; causing an inconclusive reshape state to be read in its
constructor.
lvm2 test lvconvert-raid-reshape-stripes-load-reload.sh can cause
BUG_ON() to trigger in md_run(), e.g.:
"kernel BUG at drivers/md/raid5.c:7567!".
Scenario triggering the bug:
1. the MD sync thread calls end_reshape() from raid5_sync_request()
when done reshaping. However end_reshape() _only_ updates the
reshape position to MaxSector keeping the changed layout
configuration though (i.e. any delta disks, chunk sector or RAID
algorithm changes). That inconclusive configuration is stored in
the superblock.
2. dm-raid constructs a mapping, loading named inconsistent superblock
as of step 1 before step 3 is able to finish resetting the reshape
state completely, and calls md_run() which leads to mentioned bug
in raid5.c.
3. the MD RAID personality's finish_reshape() is called; which resets
the reshape information on chunk sectors, delta disks, etc. This
explains why the bug is rarely seen on multi-core machines, as MD's
finish_reshape() superblock update races with the dm-raid
constructor's superblock load in step 2.
Fix identifies inconclusive superblock content in the dm-raid
constructor and resets it before calling md_run(), factoring out
identifying checks into rs_is_layout_change() to share in existing
rs_reshape_requested() and new rs_reset_inclonclusive_reshape(). Also
enhance a comment and remove an empty line.
Cc: [email protected]
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
Make use of dm_bufio_issue_discard() to pass discards down to the
underlying device.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
This new target is similar to the linear target except that it emulates
a smaller logical block size on a device with a larger logical block
size. Its main purpose is to emulate 512 byte sectors on 4K native
disks (i.e. 512e).
See Documentation/admin-guide/device-mapper/dm-ebs.rst for details.
Reviewed-by: Damien Le Moal <[email protected]>
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Randy Dunlap <[email protected]> [Kconfig fixes]
Signed-off-by: Zheng Bin <[email protected]> [static fixes]
Signed-off-by: Mike Snitzer <[email protected]>
raid_status() wasn't emitting rebuild flags on the table line properly
because the rdev number was not yet set properly; index raid component
devices array directly to solve.
Also fix wrong argument count on emitted table line caused by 1 too
many rebuild/write_mostly argument and consider any journal_(dev|mode)
pairs.
Link: https://bugzilla.redhat.com/1782045
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
Pass already deciphered state into rs_get_progress, simplify recovery offset
definition and combine two st_resync, st_reshape conditionals into one as is
already the case with st_check and st_repair.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
rs_setup_recovery() sets the starting recovery offset.
Drop superfluous rs_setup_recovery() and replace with __rs_setup_recovery().
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
This fixes a flaw causing raid set extensions not to be synchronized
in case the MD bitmap resize required additional pages to be allocated.
Also share resize code in the raid constructor between
new size changes and those occuring during recovery.
Bump the target version to define the change and document
it in Documentation/admin-guide/device-mapper/dm-raid.rst.
Reported-by: Steve D <[email protected]>
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
Add a size argument to rs_set_dev_and_array_sectors as prerequisite
to fixing grown device resynchronization not occuring when new MD
bitmap pages have to be allocated as a result of the extension in
a follwup patch.
Also avoid code duplication by using rs_set_rdev_sectors
in the aforementioned function.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
null_handle_bio() erroneously uses the bio_op macro
which masks respective request flag bits including REQ_FUA
out thus failing the check.
Fix by checking bio->bi_opf directly.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
Sending a check/repair message infrequently leads to -EBUSY instead of
properly identifying an active resync. This occurs because
raid_message() is testing recovery bits in a racy way.
Fix by calling decipher_sync_action() from raid_message() to properly
identify the idle state of the RAID device.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
Bump target version to reflect the documented fixes are available.
Also fix some code comments (typos and clarity).
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
On fast devices such as NVMe, a flaw in rs_get_progress() results in
false target status output when userspace lvm2 requests leg rebuilds
(symptom of the failure is device health chars 'aaaaaaaa' instead of
expected 'aAaAAAAA' causing lvm2 to fail).
The correct sync action state definitions already exist in
decipher_sync_action() so fix rs_get_progress() to use it.
Change decipher_sync_action() to return an enum rather than a string for
the sync states and call it from rs_get_progress(). Introduce
sync_str() to translate from enum to the string that is needed by
raid_status().
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
Update superblock when particular devices are requested via rebuild
(e.g. lvconvert --replace ...) to avoid spurious failure with the "New
device injected into existing raid set without 'delta_disks' or
'rebuild' parameter specified" error message.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
When initiating a stripe adding reshape, a deadlock between
md_stop_writes() waiting for the sync thread to stop and the running
sync thread waiting for inactive stripes occurs (this frequently happens
on single-core but rarely on multi-core systems).
Fix this deadlock by setting MD_RECOVERY_WAIT to have the main MD
resynchronization thread worker (md_do_sync()) bail out when initiating
the reshape via constructor arguments.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
Loading a new mapping table, the dm-raid target's constructor
retrieves the volatile reshaping state from the raid superblocks.
When the new table is activated in a following resume, the actual
reshape position is retrieved. The reshape driven by the previous
mapping can already have finished on small and/or fast devices thus
updating raid superblocks about the new raid layout.
This causes the actual array state (e.g. stripe size reshape finished)
to be inconsistent with the one in the new mapping, causing hangs with
left behind devices.
This race does not occur with usual raid device sizes but with small
ones (e.g. those created by the lvm2 test suite).
Fix by no longer transferring stale/inconsistent raid_set state during
preresume.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
parse_raid_params() compares variable "int value" with INT_MAX.
E.g. related Coverity report excerpt:
CID 1364818 (#2 of 3): Operands don't affect result (CONSTANT_EXPRESSION_RESULT) [select issue]
1433 if (value > INT_MAX) {
Fix by changing checks to avoid INT_MAX.
Whilst on it, avoid unnecessary checks against constants
and add check for sane recovery speed min/max.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
Fix a race for "nosync" activations providing "aa.." device health
characters and "0/N" sync ratio rather than "AA..." and "N/N". Occurs
when status for the raid set is retrieved during resume before the MD
sync thread starts and clears the MD_RECOVERY_NEEDED flag.
Cc: [email protected] # 4.16+
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
This target's kernel module being named dm-unstripe.ko doesn't allow
lvm2's DM module autoload capability to load the dm-unstripe.ko
because lvm2 looks for dm-unstriped.ko due to the target name being
"unstriped".
Add the "dm-unstriped" module alias to resolve this oversight.
NOTE: this isn't needed for the "striped" target, despite its source
file being named dm-stripe.c, because it is part of dm-mod.ko.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
Address "FIXME: must support non power of 2 chunk_size, dm-stripe.c does".
Bump target version to indicate change.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Tested-by: Scott Bauer <[email protected]>
Reviewed-by: Scott Bauer <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
If no metadata devices are configured on raid1/4/5/6/10
(e.g. via dm-raid), md_write_start() unconditionally waits
for superblocks to be written thus deadlocking.
Fix introduces mddev->has_superblocks bool, defines it in md_run()
and checks for it in md_write_start() to conditionally avoid waiting.
Once on it, check for non-existing superblocks in md_super_write().
Link: https://bugzilla.kernel.org/show_bug.cgi?id=198647
Fixes: cc27b0c78c ("md: fix deadlock between mddev_suspend() and md_write_start()")
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Shaohua Li <[email protected]>
No need to calculate the reshaping progress because
mddev->curr_resync_completed holds it.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
During reshape, 'A' chars were reported in status rather than 'a'.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
In order to avoid redoing synchronization/recovery/reshape partially,
the raid set got frozen until after all passed in table line flags had
been cleared. The related table reload sequence had to be precisely
followed, or reshaping may lead to data corruption caused by the active
mapping carrying on with a reshape when the inactive mapping already
had retrieved a stale reshape position.
Harden by retrieving the actual resync/recovery/reshape position
during resume whilst the active table is suspended thus avoiding
to keep the raid set frozen altogether. This prevents superfluous
redoing of an already resynchronized or recovered segment and,
most importantly, potential for redoing of an already reshaped
segment causing data corruption.
Fixes: d39f0010e ("dm raid: fix raid_resume() to keep raid set frozen as needed")
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
Verifying the current raid sets redundancy based on retrieved
superblock content has to use the superblock's raid level (e.g. raid0),
not the constructor requested one (e.g. raid10).
Using the requested raid level of raid10 lead to a "divide error"
on raid0 which defines data copies divided by to be zero.
Also check for bogus data copies.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
Move raid_resume()'s setting of 'rw' and 'in_sync' to just prior to
mddev_resume().
Also, remove unused 'bitmap_loaded' member from "struct raid_set".
No functional changes.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
Fix various sync state issues causing racy/bogus sync ratio,
sync_action ad health chars in dm_status() info output.
Sync ratio could be N/N (i.e. 100%) shortly after raid set
creation, i.e. creating a new RaidLV or upconverting a linear LV to
raid1 thus:
"0 2097152 raid raid1 2 Aa 2097162/2097152 recover 0 0 -"
instead of:
"0 2097152 raid raid1 2 Aa 0/2097152 idle 0 0 -"
Sync action could be non-idle, when the MD thread was done with io.
Health chars could be 'A' when they should be 'a' for a short time
before a resynchonization started.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
The raid_status() function passes the bool array_in_sync variable around
providing synchronization state of the MD array. Replace it with a
runtime flag. This will avoid a pattern of having to pass discrete
variables to various functions.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
The MD sync thread updates recovery flags providing state of any
running, idle, frozen, recovering, reshaping, ... activity it performs
and updates respective flags asynchronously versus dm processing
raid_status(). To close that race window, take a single copy of the
flags and pass it into its callees.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
During a reshape request: if userspace reloads a "raid" table multiple
times, resulting in multiple superblock reads, the raid set needs to
stay frozen until all config changes (chunk size, layout data_offset,
delta_disks) have been stored in the superblocks and respective flags
cleared.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
Check all component data device sizes versus calculated size.
Reject if device(s) are too small. Otherwise, MD will fail the
operation by accessing beyond the end of the data device.
An example use-case is that growing bitmap won't fit any more and the MD
runtime will report an error when DM raid should catch this earlier.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
The raid set size is being revalidated unconditionally before a
reshaping conversion is started. MD requires the size to only be
reduced in case of a stripe removing (i.e. shrinking) reshape but not
when growing because the raid array has to stay small until after the
growing reshape finishes.
Fix by avoiding the size revalidation in preresume unless a shrinking
reshape is requested.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
Pay attention to existing reshape space to define if a raid set needs
resizing. Otherwise we can hit "Can't resize a reshaping raid set"
when a reshape is being requested.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
The md raid personalities call md_finish_reshape() at the end of a
reshape conversion which adjusts rdev->sectors.
Correct/check rdev->sectors before initiating a reshape and raise the
recovery pointer accordingly.
Otherwise, the DM raid coordinated reshape will fail.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
md_stop_writes() is called in raid_presuspend() causing deadlocks on
bios submitted afterwards -- which happens on loaded raid sets with
conversion requests.
Fix by moving md_stop_writes() to raid_postsuspend(). NOTE: when the
recovery's frozen (MD_RECOVERY_FROZEN), writes haven't been started (or
are already stopped) so don't stop them again.
Also remove superfluous readonly setting.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
Requesting a sync on an active raid device via a table reload
(see 'sync' parameter in Documentation/device-mapper/dm-raid.txt)
skips the super_load() call that defines the superblock size
(rdev->sb_size) -- resulting in an oops if/when super_sync()->memset()
is called.
Fix by moving the initialization of the superblock start and size
out of super_load() to the caller (analyse_superblocks).
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
Bumo dm-raid target version to 1.12.1 to reflect that commit cc27b0c78c
("md: fix deadlock between mddev_suspend() and md_write_start()") is
available.
This version change allows userspace to detect that MD fix is available.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
Use runtime flag to ensure that an mddev gets suspended/resumed just once.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
During growing reshapes (i.e. stripes being added to a raid set), the
new stripe images are not in-sync and not part of the raid set until
the reshape is started.
LVM2 has to request multiple table reloads involving superblock updates
in order to reflect proper size of SubLVs in the cluster. Before a stripe
adding reshape starts, validate_raid_redundancy() fails as a result of that
because it checks the total number of devices against the number of rebuild
ones rather than the actual ones in the raid set (as retrieved from the
superblock) thus resulting in failed raid4/5/6/10 redundancy checks.
E.g. convert 3 stripes -> 7 stripes raid5 (which only allows for maximum
1 device to fail) requesting +4 delta disks causing 4 devices to rebuild
during reshaping thus failing activation.
To fix this, move validate_raid_redundancy() to get access to the
current raid_set members.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
Return 0 rather than BUG() if __rdev_sectors() fails and catch invalid
rdev size in the constructor.
Reported-by: Hannes Reinecke <[email protected]>
Cc: [email protected]
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
When a RAID set was created on dm-raid version < 1.9.0 (old RAID
superblock format), all of the new 1.9.0 members of the superblock are
uninitialized (zero) -- including the device sectors member needed to
support shrinking.
All the other accesses to superblock fields new in 1.9.0 were reviewed
and verified to be properly guarded against invalid use. The 'sectors'
member was the only one used when the superblock version is < 1.9.
Don't access the superblock's >= 1.9.0 'sectors' member unconditionally.
Also add respective comments.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
Commit 63c32ed4af ("dm raid: add raid4/5/6 journaling support") added
journal support to close the raid4/5/6 "write hole" -- in terms of
writethrough caching.
Introduce a "journal_mode" feature and use the new
r5c_journal_mode_set() API to add support for switching the journal
device's cache mode between write-through (the current default) and
write-back.
NOTE: If the journal device is not layered on resilent storage and it
fails, write-through mode will cause the "write hole" to reoccur. But
if the journal fails while in write-back mode it will cause data loss
for any dirty cache entries unless resilent storage is used for the
journal.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
Commit 3a1c1ef2f ("dm raid: enhance status interface and fixup
takeover/raid0") added new table line arguments and introduced an
ordering flaw. The sequence of the raid10_copies and raid10_format
raid parameters got reversed which causes lvm2 userspace to fail by
falsely assuming a changed table line.
Sequence those 2 parameters as before so that old lvm2 can function
properly with new kernels by adjusting the table line output as
documented in Documentation/device-mapper/dm-raid.txt.
Also, add missing version 1.10.1 highlight to the documention.
Fixes: 3a1c1ef2f ("dm raid: enhance status interface and fixup takeover/raid0")
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
Commit 2ded370373 ("md/r5cache: State machine for raid5-cache write
back mode") added support for "write-back" caching on the raid journal
device.
In order to allow the dm-raid target to switch between the available
"write-through" and "write-back" modes, provide a new
r5c_journal_mode_set() API.
Use the new API in existing r5c_journal_mode_store()
Signed-off-by: Heinz Mauelshagen <[email protected]>
Acked-by: Shaohua Li <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
The lvm2 sequence to manage dm-raid constructor flags that trigger a
rebuild or a reshape is defined as:
1) load table with flags (e.g. rebuild/delta_disks/data_offset)
2) clear out the flags in lvm2 metadata
3) store the lvm2 metadata, reload the table to reset the flags
previously established during the initial load (1) -- in order to
prevent repeatedly requesting a rebuild or a reshape on activation
Currently, loading an inactive table with rebuild/reshape flags
specified will cause dm-raid to rebuild/reshape on resume and thus start
updating the raid metadata (about the progress). When the second table
reload, to reset the flags, occurs the constructor accesses the volatile
progress state kept in the raid superblocks. Because the active mapping
is still processing the rebuild/reshape, that position will be stale by
the time the device is resumed.
In the reshape case, this causes data corruption by processing already
reshaped stripes again. In the rebuild case, it does _not_ cause data
corruption but instead involves superfluous rebuilds.
Fix by keeping the raid set frozen during the first resume and then
allow the rebuild/reshape during the second resume.
Fixes: 9dbd1aa3a ("dm raid: add reshaping support to the target")
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
Cc: [email protected] # 4.8+
For consistency, call read_disk_sb() from
attempt_restore_of_faulty_devices() instead
of calling sync_page_io() directly.
Explicitly set device to faulty on superblock read error.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
Add md raid4/5/6 journaling support (upstream commit bac624f3f8 started
the implementation) which closes the write hole (i.e. non-atomic updates
to stripes) using a dedicated journal device.
Background:
raid4/5/6 stripes hold N data payloads per stripe plus one parity raid4/5
or two raid6 P/Q syndrome payloads in an in-memory stripe cache.
Parity or P/Q syndromes used to recover any data payloads in case of a disk
failure are calculated from the N data payloads and need to be updated on the
different component devices of the raid device. Those are non-atomic,
persistent updates. Hence a crash can cause failure to update all stripe
payloads persistently and thus cause data loss during stripe recovery.
This problem gets addressed by writing whole stripe cache entries (together with
journal metadata) to a persistent journal entry on a dedicated journal device.
Only if that journal entry is written successfully, the stripe cache entry is
updated on the component devices of the raid device (i.e. writethrough type).
In case of a crash, the entry can be recovered from the journal and be written
again thus ensuring consistent stripe payload suitable to data recovery.
Future dependencies:
once writeback caching being worked on to compensate for the throughput
implictions involved with writethrough overhead is supported with journaling
in upstream, an additional patch based on this one will support it in dm-raid.
Journal resilience related remarks:
because stripes are recovered from the journal in case of a crash, the
journal device better be resilient. Resilience becomes mandatory with
future writeback support, because loosing the working set in the log
means data loss as oposed to writethrough, were the loss of the
journal device 'only' reintroduces the write hole.
Fix comment on data offsets in parse_dev_params() and initialize
new_data_offset as well.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
During raid set resize checks and setting up the recovery offset in case a raid
set grows, calculated rd->md.dev_sectors is compared to rs->dev[0].rdev.sectors.
Device 0 may not be defined in case userspace passes in '- -' for it
(lvm2 doesn't do that so far), thus it's device sectors can't be taken
authoritatively in this comparison and another valid device must be used
to retrieve the device size.
Use mddev->dev_sectors in checking for ongoing recovery for the same reason.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
This fix addresses the following 3 failure scenarios:
1) If a (transiently) inaccessible metadata device is being passed into the
constructor (e.g. a device tuple '254:4 254:5'), it is processed as if
'- -' was given. This erroneously results in a status table line containing
'- -', which mistakenly differs from what has been passed in. As a result,
userspace libdevmapper puts the device tuple seperate from the RAID device
thus not processing the dependencies properly.
2) False health status char 'A' instead of 'D' is emitted on the status
status info line for the meta/data device tuple in this metadata device
failure case.
3) If the metadata device is accessible when passed into the constructor
but the data device (partially) isn't, that leg may be set faulty by the
raid personality on access to the (partially) unavailable leg. Restore
tried in a second raid device resume on such failed leg (status char 'D')
fails after the (partial) leg returned.
Fixes for aforementioned failure scenarios:
- don't release passed in devices in the constructor thus allowing the
status table line to e.g. contain '254:4 254:5' rather than '- -'
- emit device status char 'D' rather than 'A' for the device tuple
with the failed metadata device on the status info line
- when attempting to restore faulty devices in a second resume, allow the
device hot remove function to succeed by setting the device to not in-sync
In case userspace intentionally passes '- -' into the constructor to avoid that
device tuple (e.g. to split off a raid1 leg temporarily for later re-addition),
the status table line will correctly show '- -' and the status info line will
provide a '-' device health character for the non-defined device tuple.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
Remove CTR_FLAG_MAX_WRITE_BEHIND from raid4/5/6's valid ctr flags.
Only the md raid1 personality supports setting a maximum number
of "write behind" write IOs on any legs set to "write mostly".
"write mostly" enhances throughput with slow links/disks.
Technically the "write behind" value is a write intent bitmap
property only being respected by the raid1 personality. It allows a
maximum number of "write behind" writes to any "write mostly" raid1
mirror legs to be delayed and avoids reads from such legs.
No other MD personalities supported via dm-raid make use of "write
behind", thus setting this property is superfluous; it wouldn't cause
harm but it is correct to reject it.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
When target 1.9.1 gets takeover/reshape requests on devices with old superblock
format not supporting such conversions and rejects them in super_init_validation(),
it logs bogus error message (e.g. Reshape when a takeover is requested).
Whilst on it, add messages for disk adding/removing and stripe sectors
reshape requests, use the newer rs_{takeover,reshape}_requested() API,
address a raid10 false positive in checking array positions and
remove rs_set_new() because device members are already set proper.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
dm-raid 1.9.0 fails to activate existing RAID4/10 devices that have the
old superblock format (which does not have takeover/reshaping support
that was added via commit 33e53f0685).
Fix validation path for old superblocks by reverting to the old raid4
layout and basing checks on mddev->new_{level,layout,...} members in
super_init_validation().
Cc: [email protected] # 4.8
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
When any leg(s) have failed, any read will cause a new operational
default leg to be selected and the read is resubmitted to it. If that
new default leg fails the read too, no other still accessible legs are
used to resubmit the read again -- thus failing the io.
Fix by allowing the read to get resubmitted until all operational legs
have been exhausted. Also, remove any details.bi_dev use as a flag.
Signed-off-by: Heinz Mauelshagen <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
Heinz Mauelshagen