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[DLM] overlapping cancel and unlock
Full cancel and force-unlock support. In the past, cancel and force-unlock wouldn't work if there was another operation in progress on the lock. Now, both cancel and unlock-force can overlap an operation on a lock, meaning there may be 2 or 3 operations in progress on a lock in parallel. This support is important not only because cancel and force-unlock are explicit operations that an app can use, but both are used implicitly when a process exits while holding locks. Summary of changes: - add-to and remove-from waiters functions were rewritten to handle situations with more than one remote operation outstanding on a lock - validate_unlock_args detects when an overlapping cancel/unlock-force can be sent and when it needs to be delayed until a request/lookup reply is received - processing request/lookup replies detects when cancel/unlock-force occured during the op, and carries out the delayed cancel/unlock-force - manipulation of the "waiters" (remote operation) state of a lock moved under the standard rsb mutex that protects all the other lock state - the two recovery routines related to locks on the waiters list changed according to the way lkb's are now locked before accessing waiters state - waiters recovery detects when lkb's being recovered have overlapping cancel/unlock-force, and may not recover such locks - revert_lock (cancel) returns a value to distinguish cases where it did nothing vs cases where it actually did a cancel; the cancel completion ast should only be done when cancel did something - orphaned locks put on new list so they can be found later for purging - cancel must be called on a lock when making it an orphan - flag user locks (ENDOFLIFE) at the end of their useful life (to the application) so we can return an error for any further cancel/unlock-force - we weren't setting COMP/BAST ast flags if one was already set, so we'd lose either a completion or blocking ast - clear an unread bast on a lock that's become unlocked Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
David Teigland
Steven Whitehouse
parent
0320672702
commit
ef0c2bb05f
@ -2,7 +2,7 @@
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*******************************************************************************
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**
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** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
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** Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
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**
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** This copyrighted material is made available to anyone wishing to use,
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** modify, copy, or redistribute it subject to the terms and conditions
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@ -210,6 +210,9 @@ struct dlm_args {
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#define DLM_IFL_MSTCPY 0x00010000
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#define DLM_IFL_RESEND 0x00020000
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#define DLM_IFL_DEAD 0x00040000
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#define DLM_IFL_OVERLAP_UNLOCK 0x00080000
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#define DLM_IFL_OVERLAP_CANCEL 0x00100000
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#define DLM_IFL_ENDOFLIFE 0x00200000
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#define DLM_IFL_USER 0x00000001
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#define DLM_IFL_ORPHAN 0x00000002
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@ -230,8 +233,8 @@ struct dlm_lkb {
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int8_t lkb_grmode; /* granted lock mode */
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int8_t lkb_bastmode; /* requested mode */
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int8_t lkb_highbast; /* highest mode bast sent for */
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int8_t lkb_wait_type; /* type of reply waiting for */
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int8_t lkb_wait_count;
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int8_t lkb_ast_type; /* type of ast queued for */
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struct list_head lkb_idtbl_list; /* lockspace lkbtbl */
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@ -440,6 +443,9 @@ struct dlm_ls {
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struct mutex ls_waiters_mutex;
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struct list_head ls_waiters; /* lkbs needing a reply */
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struct mutex ls_orphans_mutex;
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struct list_head ls_orphans;
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struct list_head ls_nodes; /* current nodes in ls */
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struct list_head ls_nodes_gone; /* dead node list, recovery */
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int ls_num_nodes; /* number of nodes in ls */
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706
fs/dlm/lock.c
706
fs/dlm/lock.c
File diff suppressed because it is too large
Load Diff
@ -2,7 +2,7 @@
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*******************************************************************************
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**
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** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
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** Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
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**
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** This copyrighted material is made available to anyone wishing to use,
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** modify, copy, or redistribute it subject to the terms and conditions
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@ -459,6 +459,8 @@ static int new_lockspace(char *name, int namelen, void **lockspace,
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INIT_LIST_HEAD(&ls->ls_waiters);
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mutex_init(&ls->ls_waiters_mutex);
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INIT_LIST_HEAD(&ls->ls_orphans);
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mutex_init(&ls->ls_orphans_mutex);
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INIT_LIST_HEAD(&ls->ls_nodes);
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INIT_LIST_HEAD(&ls->ls_nodes_gone);
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@ -1,5 +1,5 @@
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/*
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* Copyright (C) 2006 Red Hat, Inc. All rights reserved.
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* Copyright (C) 2006-2007 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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@ -128,35 +128,30 @@ static void compat_output(struct dlm_lock_result *res,
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}
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#endif
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/* we could possibly check if the cancel of an orphan has resulted in the lkb
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being removed and then remove that lkb from the orphans list and free it */
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void dlm_user_add_ast(struct dlm_lkb *lkb, int type)
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{
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struct dlm_ls *ls;
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struct dlm_user_args *ua;
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struct dlm_user_proc *proc;
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int remove_ownqueue = 0;
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int eol = 0, ast_type;
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/* dlm_clear_proc_locks() sets ORPHAN/DEAD flag on each
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lkb before dealing with it. We need to check this
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flag before taking ls_clear_proc_locks mutex because if
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it's set, dlm_clear_proc_locks() holds the mutex. */
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if (lkb->lkb_flags & (DLM_IFL_ORPHAN | DLM_IFL_DEAD)) {
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/* log_print("user_add_ast skip1 %x", lkb->lkb_flags); */
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if (lkb->lkb_flags & (DLM_IFL_ORPHAN | DLM_IFL_DEAD))
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return;
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}
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ls = lkb->lkb_resource->res_ls;
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mutex_lock(&ls->ls_clear_proc_locks);
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/* If ORPHAN/DEAD flag is set, it means the process is dead so an ast
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can't be delivered. For ORPHAN's, dlm_clear_proc_locks() freed
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lkb->ua so we can't try to use it. */
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lkb->ua so we can't try to use it. This second check is necessary
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for cases where a completion ast is received for an operation that
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began before clear_proc_locks did its cancel/unlock. */
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if (lkb->lkb_flags & (DLM_IFL_ORPHAN | DLM_IFL_DEAD)) {
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/* log_print("user_add_ast skip2 %x", lkb->lkb_flags); */
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if (lkb->lkb_flags & (DLM_IFL_ORPHAN | DLM_IFL_DEAD))
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goto out;
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}
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DLM_ASSERT(lkb->lkb_astparam, dlm_print_lkb(lkb););
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ua = (struct dlm_user_args *)lkb->lkb_astparam;
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@ -166,28 +161,42 @@ void dlm_user_add_ast(struct dlm_lkb *lkb, int type)
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goto out;
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spin_lock(&proc->asts_spin);
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if (!(lkb->lkb_ast_type & (AST_COMP | AST_BAST))) {
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ast_type = lkb->lkb_ast_type;
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lkb->lkb_ast_type |= type;
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if (!ast_type) {
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kref_get(&lkb->lkb_ref);
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list_add_tail(&lkb->lkb_astqueue, &proc->asts);
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lkb->lkb_ast_type |= type;
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wake_up_interruptible(&proc->wait);
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}
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if (type == AST_COMP && (ast_type & AST_COMP))
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log_debug(ls, "ast overlap %x status %x %x",
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lkb->lkb_id, ua->lksb.sb_status, lkb->lkb_flags);
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/* noqueue requests that fail may need to be removed from the
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proc's locks list, there should be a better way of detecting
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this situation than checking all these things... */
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/* Figure out if this lock is at the end of its life and no longer
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available for the application to use. The lkb still exists until
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the final ast is read. A lock becomes EOL in three situations:
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1. a noqueue request fails with EAGAIN
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2. an unlock completes with EUNLOCK
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3. a cancel of a waiting request completes with ECANCEL
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An EOL lock needs to be removed from the process's list of locks.
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And we can't allow any new operation on an EOL lock. This is
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not related to the lifetime of the lkb struct which is managed
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entirely by refcount. */
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if (type == AST_COMP && lkb->lkb_grmode == DLM_LOCK_IV &&
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ua->lksb.sb_status == -EAGAIN && !list_empty(&lkb->lkb_ownqueue))
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remove_ownqueue = 1;
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/* unlocks or cancels of waiting requests need to be removed from the
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proc's unlocking list, again there must be a better way... */
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if (ua->lksb.sb_status == -DLM_EUNLOCK ||
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if (type == AST_COMP &&
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lkb->lkb_grmode == DLM_LOCK_IV &&
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ua->lksb.sb_status == -EAGAIN)
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eol = 1;
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else if (ua->lksb.sb_status == -DLM_EUNLOCK ||
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(ua->lksb.sb_status == -DLM_ECANCEL &&
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lkb->lkb_grmode == DLM_LOCK_IV))
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remove_ownqueue = 1;
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eol = 1;
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if (eol) {
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lkb->lkb_ast_type &= ~AST_BAST;
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lkb->lkb_flags |= DLM_IFL_ENDOFLIFE;
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}
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/* We want to copy the lvb to userspace when the completion
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ast is read if the status is 0, the lock has an lvb and
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@ -204,11 +213,13 @@ void dlm_user_add_ast(struct dlm_lkb *lkb, int type)
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spin_unlock(&proc->asts_spin);
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if (remove_ownqueue) {
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if (eol) {
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spin_lock(&ua->proc->locks_spin);
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list_del_init(&lkb->lkb_ownqueue);
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if (!list_empty(&lkb->lkb_ownqueue)) {
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list_del_init(&lkb->lkb_ownqueue);
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dlm_put_lkb(lkb);
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}
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spin_unlock(&ua->proc->locks_spin);
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dlm_put_lkb(lkb);
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}
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out:
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mutex_unlock(&ls->ls_clear_proc_locks);
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