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![]() dlmlock_master() returns DLM_RECOVERING/DLM_MIGRATING/ DLM_FORWAR after adding lock to blocked list if lockres has the state DLM_LOCK_RES_RECOVERING/DLM_LOCK_RES_MIGRATING/ DLM_LOCK_RES_IN_PROGRESS. so it will retry in dlmlock(). And this may cause dlm_thread fall into an infinite loop Thread1 dlm_thread calls dlm_lock->dlmlock_master, if lockresA is in state DLM_LOCK_RES_RECOVERING, calls __dlm_wait_on_lockres() and waits until others threads clear this state; If cannot grant this lock, adding lock to blocked list, and return DLM_RECOVERING; Grant this lock and move it to grant list; After a while, retry and calls list_add_tail(), adding lock to blocked list again. Granted and blocked list of this lockres will become the following conditions: lock_res->granted.next = dlm_lock->list_head; lock_res->blocked.next = dlm_lock->list_head; dlm_lock->list_head.next = dlm_lock_resource->blocked; When dlm_thread traverses the granted list, it will fall into an endless loop, checking dlm_lock.list_head, dlm_lock->list_head.next (i.e.lock_res->blocked), lock_res->blocked.next(i.e.dlm_lock.list_head again) ..... Signed-off-by: joyce <xuejiufei@huawei.com> Reviewed-by: jensen <shencanquan@huawei.com> Cc: Jeff Liu <jeff.liu@oracle.com> Acked-by: Sunil Mushran <sunil.mushran@gmail.com> Cc: Mark Fasheh <mfasheh@suse.com> Cc: Joel Becker <jlbec@evilplan.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
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.. | ||
dlmapi.h | ||
dlmast.c | ||
dlmcommon.h | ||
dlmconvert.c | ||
dlmconvert.h | ||
dlmdebug.c | ||
dlmdebug.h | ||
dlmdomain.c | ||
dlmdomain.h | ||
dlmlock.c | ||
dlmmaster.c | ||
dlmrecovery.c | ||
dlmthread.c | ||
dlmunlock.c | ||
dlmver.c | ||
dlmver.h | ||
Makefile |