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* dlm: add rcu_barrier before destroy kmem cacheAlexander Aring2024-06-131-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | In the case we trigger dlm_free_rsb() that does a call_rcu() and the responding kfree() of res_lvbptr and a kmem_cache_free() of the rsb pointer we need to wait until this pending operation is done before calling kmem_cache_destroy(). We doing that by using rcu_barrier() that waits until all pending call_rcu() are done. This avoids that kmem_cache_destroy() complains about active objects around that are not being freed yet by call_rcu(). There is currently more discussions about to make this behaviour better, see: https://lore.kernel.org/netdev/20240609082726.32742-1-Julia.Lawall@inria.fr/ However this is only for call_rcu() if the callback calls kmem_cache_destroy() only to replace it by kfree_rcu() call which has currently some issue. This isn't our case because we also free the res_lvbptr if being set. For our case, to avoid the above race rcu_barrier() should be used before calling kmem_cache_destroy() to be sure that there are no active objects around. This is exactly what net/batman-adv is also doing before calling their kmem_cache_destroy() in module unloading. Fixes: 01fdeca1cc2d ("dlm: use rcu to avoid an extra rsb struct lookup") Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: remove DLM_LSFL_SOFTIRQ from exflagsAlexander Aring2024-06-121-1/+2
| | | | | | | | | | | | The DLM rcom handling has a check that all exflags are the same for the whole lockspace membership nodes. There are some flags that requires such handling, however DLM_LSFL_SOFTIRQ does not require this handling and it should be backwards compatibility with other lockspaces that does not set this flag. Fixes: f328a26eeb53 ("dlm: introduce DLM_LSFL_SOFTIRQ_SAFE") Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* fs: dlm: remove unused struct 'dlm_processed_nodes'Dr. David Alan Gilbert2024-06-121-6/+0
| | | | | | | | | | | The last use of 'dlm_processed_nodes' was removed in commit 1696c75f1864 ("fs: dlm: add send ack threshold and append acks to msgs"). Remove it. Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: implement LSFL_SOFTIRQ_SAFEAlexander Aring2024-06-115-84/+126
| | | | | | | | | When a lockspace user allows it, run callback functions directly from softirq context, instead of queueing callbacks to be run from the dlm_callback workqueue context. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: introduce DLM_LSFL_SOFTIRQ_SAFEAlexander Aring2024-06-111-0/+3
| | | | | | | | | | | | Introduce a new external lockspace flag DLM_LSFL_SOFTIRQ_SAFE. A lockspace user will set this flag if it can handle dlm running the callback functions from softirq context. When not set, dlm will continue to run callback functions from the dlm_callback workqueue. The new lockspace flag cannot be used for user space lockspaces, so a uapi placeholder definition is used for the new flag value. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: use LSFL_FS to check for kernel lockspaceAlexander Aring2024-06-113-12/+19
| | | | | | | | | | The existing external lockspace flag DLM_LSFL_FS is now also saved as an internal flag LSFL_FS, so it can be checked from other code locations which want to know if a lockspace is used from the kernel or user space. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: use rcu to avoid an extra rsb struct lookupAlexander Aring2024-06-103-16/+96
| | | | | | | | | | | | Use rcu to free rsb structs, and hold the rcu read lock while looking up rsb structs. This allows us to avoid an extra hash table lookup for an rsb. A new rsb flag HASHED is added which is set while the rsb is in the hash table. This flag is checked in place of repeating the hash table lookup. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: fix add_scan and del_scan usageDavid Teigland2024-06-101-22/+35
| | | | | | | | | Remove a few calls to add_scan() and del_scan() in cases where the rsb is a dir record, so the rsb should never be placed on the scan list at all. Add WARN_ON to catch cases where this is done. Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: change list and timer namesDavid Teigland2024-06-109-219/+182
| | | | | | | | | | | | | | | | | | | | The old terminology of "toss" and "keep" is no longer an accurate description of the rsb states and lists, so change the names to "inactive" and "active". The old names had also been copied into the scanning code, which is changed back to use the "scan" name. - "active" rsb structs have lkb's attached, and are ref counted. - "inactive" rsb structs have no lkb's attached, are not ref counted. - "scan" list is for rsb's that can be freed after a timeout period. - "slow" lists are for infrequent iterations through active or inactive rsb structs. - inactive rsb structs that are directory records will not be put on the scan list, since they are not freed based on timeouts. - inactive rsb structs that are not directory records will be put on the scan list to be freed, since they are not longer needed. Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: move recover idr to xarray datastructureAlexander Aring2024-05-313-36/+40
| | | | | | | | | According to kdoc idr is deprecated and xarrays should be used nowadays. This patch is moving the recover idr implementation to xarray datastructure. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: move lkb idr to xarray datastructureAlexander Aring2024-05-313-46/+49
| | | | | | | | According to kernel doc idr is deprecated and xarrays should be used nowadays. This patch is moving the lkb idr implementation to xarrays. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: drop own rsb pre allocation mechanismAlexander Aring2024-05-313-99/+13
| | | | | | | | | This patch drops the own written rsb pre allocation mechanism as this is already done by using kmem caches, we don't need another layer on top of that to running some pre allocation scheme. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: remove ls_local_handle from struct dlm_lsAlexander Aring2024-05-313-16/+5
| | | | | | | | | | | | | | This patch removes ls_local_handle from struct dlm_ls as it stores the ls pointer of the top level structure itesef and this isn't necessary. There is a lookup functionality to lookup the lockspace in dlm_find_lockspace_local() but the given input parameter is the pointer already. This might be more safe to lookup a lockspace but given a wrong lockspace pointer is a bug in the code and we save the additional lookup here. The dlm_ls structure can be still hidden by using dlm_lockspace_t handle pointer. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: remove unused parameter in dlm_midcomms_addrAlexander Aring2024-05-315-6/+6
| | | | | | | | This patch removes an parameter which is currently not used by dlm_midcomms_addr(). Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: don't kref_init rsbs created for toss listAlexander Aring2024-05-311-1/+0
| | | | | | | | | | This patch removes a kref_init() that isn't necessary because the rsb is created for toss list. Under toss list the rsb should not have any reference counting logic. If in theory the rsb gets to into keep list then a kref_init() for res_ref will be initiated. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: remove scand leftoversAlexander Aring2024-05-312-9/+0
| | | | | | | | | This patch removes some leftover related code from dlm_scand that was dropped in commit b1f2381c1a8d ("dlm: drop dlm_scand kthread and use timers"). Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: return -ENOMEM if ls_recover_buf failsAlexander Aring2024-04-231-1/+3
| | | | | | | | | | | | | This patch fixes to return -ENOMEM in case of an allocation failure that was forgotten to change in commit 6c648035cbe7 ("dlm: switch to use rhashtable for rsbs"). Reported-by: kernel test robot <lkp@intel.com> Reported-by: Dan Carpenter <dan.carpenter@linaro.org> Closes: https://lore.kernel.org/r/202404200536.jGi6052v-lkp@intel.com/ Fixes: 6c648035cbe7 ("dlm: switch to use rhashtable for rsbs") Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: fix sleep in atomic contextAlexander Aring2024-04-173-8/+8
| | | | | | | | | | | | | | | | | | This patch changes the orphans mutex to a spinlock since commit c288745f1d4a ("dlm: avoid blocking receive at the end of recovery") is using a rwlock_t to lock the DLM message receive path and do_purge() can be called while this lock is held that forbids to sleep. We need to use spin_lock_bh() because also a user context that calls dlm_user_purge() can call do_purge() and since commit 92d59adfaf71 ("dlm: do message processing in softirq context") the DLM message receive path is done under softirq context. Fixes: c288745f1d4a ("dlm: avoid blocking receive at the end of recovery") Reported-by: Dan Carpenter <dan.carpenter@linaro.org> Closes: https://lore.kernel.org/gfs2/9ad928eb-2ece-4ad9-a79c-d2bce228e4bc@moroto.mountain/ Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: use rwlock for lkbidrAlexander Aring2024-04-163-41/+11
| | | | | | | | Convert the lock for lkbidr to an rwlock. Most idr lookups will use the read lock. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: use rwlock for rsb hash tableAlexander Aring2024-04-167-87/+206
| | | | | | | | | | The conversion to rhashtable introduced a hash table lock per lockspace, in place of per bucket locks. To make this more scalable, switch to using a rwlock for hash table access. The common case fast path uses it as a read lock. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: drop dlm_scand kthread and use timersAlexander Aring2024-04-167-239/+283
| | | | | | | | | | | | | | | | | | | Currently the scand kthread acts like a garbage collection for expired rsbs on toss list, to clean them up after a certain timeout. It triggers every couple of seconds and iterates over the toss list while holding ls_rsbtbl_lock for the whole hash bucket iteration. To reduce the amount of time holding ls_rsbtbl_lock, we now handle the disposal of expired rsbs using a per-lockspace timer that expires for the earliest tossed rsb on the lockspace toss queue. This toss queue is ordered according to the rsb res_toss_time with the earliest tossed rsb as the first entry. The toss timer will only trylock() necessary locks, since it is low priority garbage collection, and will rearm the timer if trylock() fails. If the timer function does not find any expired rsb's, it rearms the timer with the next earliest expired rsb. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: do not use ref counts for rsb in the toss stateAlexander Aring2024-04-163-32/+32
| | | | | | | | | | | | | In the past we had problems when an rsb had a reference counter greater than one while in the toss state. An rsb in the toss state is not actively used for locking, and should not have any other references apart from the single ref keeping it on the rsb hash. Shift to freeing rsb's directly rather than using kref_put to free them, since the ref counting is not meant to be used in this state. Add warnings if ref counting is seen while an rsb is in the toss state. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: switch to use rhashtable for rsbsAlexander Aring2024-04-168-160/+86
| | | | | | | | Replace our own hash table with the more advanced rhashtable for keeping rsb structs. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: add rsb lists for iterationAlexander Aring2024-04-166-261/+84
| | | | | | | | | | To prepare for using rhashtable, add two rsb lists for iterating through rsb's in two uncommon cases where this is necesssary: - when dumping rsb state from debugfs, now using seq_list. - when looking at all rsb's during recovery. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: merge toss and keep hash table lists into one listAlexander Aring2024-04-167-76/+98
| | | | | | | | | | | There are several places where lock processing can perform two hash table lookups, first in the "keep" list, and if not found, in the "toss" list. This patch introduces a new rsb state flag "RSB_TOSS" to represent the difference between the state of being on keep vs toss list, so that the two lists can be combined. This avoids cases of two lookups. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: change to single hashtable lockAlexander Aring2024-04-167-61/+60
| | | | | | | | Prepare to replace our own hash table with rhashtable by replacing the per-bucket locks in our own hash table with a single lock. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: increment ls_count for dlm_scandAlexander Aring2024-04-161-0/+3
| | | | | | | | | Increment the ls_count value while dlm_scand is processing a lockspace so that release_lockspace()/remove_lockspace() will wait for dlm_scand to finish. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: do message processing in softirq contextAlexander Aring2024-04-091-8/+20
| | | | | | | | | | | | | Move dlm message processing from an ordered workqueue context to an ordered softirq context. Handling dlm messages in softirq will allow requests to be cleared more quickly and efficiently, and should avoid longer queues of incomplete requests. Later patches are expected to run completion/blocking callbacks directly from this message processing context, further reducing context switches required to complete a request. In the longer term, concurrent message processing could be implemented. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: use spin_lock_bh for message processingAlexander Aring2024-04-0914-258/+287
| | | | | | | | | | Use spin_lock_bh for all spinlocks involved in message processing, in preparation for softirq message processing. DLM lock requests from user space involve dlm processing in user context, in addition to the standard kernel context, necessitating bh variants. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: remove schedule in receive pathAlexander Aring2024-04-091-1/+0
| | | | | | | | Remove an explicit schedule() call in the message processing path, in preparation for softirq message processing. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: convert ls_recv_active from rw_semaphore to rwlockAlexander Aring2024-04-095-8/+8
| | | | | | | | Convert ls_recv_active rw_semaphore to an rwlock to avoid sleeping, in preparation for softirq message processing. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: avoid blocking receive at the end of recoveryAlexander Aring2024-04-095-41/+30
| | | | | | | | | | | | | | | The end of the recovery process transitioned to normal message processing by temporarily blocking the receiving context, processing saved messages, then unblocking the receiving context. To avoid blocking the receiving context, the old wait_queue and mutex are replaced by a new rwlock and the new RECV_MSG_BLOCKED flag. Received messages are added to the list of saved messages, protected by the rwlock, until the flag is cleared, which happens when all saved messages have been processed. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: convert res_lock to spinlockAlexander Aring2024-04-093-4/+4
| | | | | | | | Convert the rsb struct res_lock from a mutex to a spinlock in preparation for processing messages in softirq context. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: convert ls_waiters_mutex to spinlockAlexander Aring2024-04-094-14/+14
| | | | | | | | Convert the waiters mutex to a spinlock in prepration for processing messages in softirq context. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: drop mutex use in waiters recoveryAlexander Aring2024-04-093-8/+23
| | | | | | | | | | | | | | The waiters_mutex no longer needs to be used in the waiters recovery functions dlm_recover_waiters_pre() and dlm_recover_waiters_pre(). During recovery, ordinary locking operations are paused, and the recovery thread is the only context accessing the waiters list, so the lock is not needed. Access to the waiters list from debugfs functions is avoided by taking the top level recovery lock in the debugfs dump function. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: add new struct to save position in dlm_copy_master_namesAlexander Aring2024-04-094-10/+116
| | | | | | | | | | | Add a new struct to save the current position in the rsb masters_list while sending the rsb names to other nodes. The rsb names are sent in multiple chunks, and for each new chunk, the new "dlm_dir_dump" struct saves the last position in the masters_list. The new struct is also used to save more information to sanity check the recovery process. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: move rsb root_list to ls_recover() stackAlexander Aring2024-04-099-70/+47
| | | | | | | | Move the rsb root_list from the lockspace to a stack variable since it is now only used by the ls_recover() function. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: use a new list for recovery of master rsb namesAlexander Aring2024-04-095-14/+79
| | | | | | | | | | Add a new "masters_list" for master rsb structs, with a new rwlock. The new list is created and used during the recovery process to send the master rsb names to new nodes. With this change, the current "root_list" can be used without locking. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: move root_list functionality to recover.cAlexander Aring2024-04-093-44/+39
| | | | | | | | | Move dlm_create_root_list() and dlm_release_root_list() to recover.c and declare them static because they are only used there. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: switch to GFP_ATOMIC in dlm allocationsAlexander Aring2024-04-094-8/+4
| | | | | | | | | Replace GFP_NOFS with GFP_ATOMIC. Also stop using idr_preload which uses a non-bh spin_lock. This is further preparation for softirq message processing. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: remove allocation parameter in msg allocationAlexander Aring2024-04-098-57/+41
| | | | | | | | | Remove the context parameter for message allocations and always use GFP_ATOMIC. This prepares for softirq message processing. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: Simplify the allocation of slab caches in dlm_lowcomms_msg_cache_createKunwu Chan2024-04-021-1/+1
| | | | | | | | | | Use the new KMEM_CACHE() macro instead of direct kmem_cache_create to simplify the creation of SLAB caches. Signed-off-by: Kunwu Chan <chentao@kylinos.cn> Acked-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: remove callback reference countingAlexander Aring2024-04-017-55/+28
| | | | | | | | | | | Get rid of the unnecessary refcounting on callback structs. Copy interesting callback info into the lkb struct rather than maintaining pointers to callback structs from the lkb. This goes back to the way things were done prior to commit 61bed0baa4db ("fs: dlm: use a non-static queue for callbacks"). Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: fix race between final callback and removeAlexander Aring2024-04-015-213/+129
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch fixes the following issue: node 1 is dir node 2 is master node 3 is other 1->2: unlock 2: put final lkb, rsb moved to toss 2->1: unlock_reply 1: queue lkb callback with EUNLOCK 2->1: remove 1: receive_remove ignored (rsb on keep because of queued lkb callback) 1: complete lkb callback, put_lkb, move rsb to toss 3->1: lookup 1->3: lookup_reply master=2 3->2: request 2->3: request_reply EBADR In summary: An unexpected lkb reference causes the rsb to remain on the wrong list. The rsb being on the wrong list causes receive_remove to be ignored. An ignored receive_remove causes inconsistent dir and master state. This sequence requires an unusually long delay in delivering the unlock callback, because the remove message from 2->1 usually happens after some seconds. So, it's not known exactly how frequently this sequence occurs in pratice. It's possible that the same end result could also have another unknown cause. The solution for this issue is to further separate callback state from the lkb, so that an lkb reference (and from that, an rsb ref) are not held while a callback remains queued. Then, within the unlock_reply, the lkb will be freed and the rsb moved to the toss list. So, the receive_remove will not be ignored. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: combine switch case fail and default statementsAlexander Aring2024-04-012-8/+6
| | | | | | | | | This patch combines the failure and default cases for enqueue and dequeue a callback to the lkb callback queue that should end in both cases as it should never happen. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: save callback debug info earlierAlexander Aring2024-04-011-4/+6
| | | | | | | | Save lkb callback info when queueing the callback so that the lkb struct is not needed in the callback workqueue processing. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: remove callback queue debugfs functionalityAlexander Aring2024-04-011-96/+0
| | | | | | | | Remove the ability to dump pending lkb callbacks from debugfs. The prepares for separating lkb structs from callbacks. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: remove lkb from callback tracepointsAlexander Aring2024-04-012-4/+14
| | | | | | | | | Stop using lkb structs in the callback tracepoints so that lkb references are not needed. This prepares for separating lkb structs from callbacks. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: Simplify the allocation of slab caches in dlm_midcomms_cache_createKunwu Chan2024-04-011-2/+1
| | | | | | | | | Use the new KMEM_CACHE() macro instead of direct kmem_cache_create to simplify the creation of SLAB caches. Signed-off-by: Kunwu Chan <chentao@kylinos.cn> Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: fix user space lock decision to copy lvbAlexander Aring2024-04-013-13/+17
| | | | | | | | | | | | | | | This patch fixes the copy lvb decision for user space lock requests. Checking dlm_lvb_operations is done earlier, where granted/requested lock modes are available to use in the matrix. The decision had been moved to the wrong location, where granted mode and requested mode where the same, which causes the dlm_lvb_operations matix to produce the wrong copy decision. For PW or EX requests, the caller could get invalid lvb data. Fixes: 61bed0baa4db ("fs: dlm: use a non-static queue for callbacks") Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
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