/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=8:tabstop=8:
*
- * Copyright (c) 2003 Hewlett-Packard Development Company LP.
- * Developed under the sponsorship of the US Government under
- * Subcontract No. B514193
+ * GPL HEADER START
*
- * This file is part of the Lustre file system, http://www.lustre.org
- * Lustre is a trademark of Cluster File Systems, Inc.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
- * You may have signed or agreed to another license before downloading
- * this software. If so, you are bound by the terms and conditions
- * of that agreement, and the following does not apply to you. See the
- * LICENSE file included with this distribution for more information.
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
*
- * If you did not agree to a different license, then this copy of Lustre
- * is open source software; you can redistribute it and/or modify it
- * under the terms of version 2 of the GNU General Public License as
- * published by the Free Software Foundation.
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
*
- * In either case, Lustre is distributed in the hope that it will be
- * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
- * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * license text for more details.
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see
+ * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright 2008 Sun Microsystems, Inc. All rights reserved
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2003 Hewlett-Packard Development Company LP.
+ * Developed under the sponsorship of the US Government under
+ * Subcontract No. B514193
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
*/
#define DEBUG_SUBSYSTEM S_LDLM
#define l_flock_waitq l_lru
-static struct list_head ldlm_flock_waitq = CFS_LIST_HEAD_INIT(ldlm_flock_waitq);
+/**
+ * Wait queue for Posix lock deadlock detection, added with
+ * ldlm_lock::l_flock_waitq.
+ */
+static CFS_LIST_HEAD(ldlm_flock_waitq);
+/**
+ * Lock protecting access to ldlm_flock_waitq.
+ */
+spinlock_t ldlm_flock_waitq_lock = SPIN_LOCK_UNLOCKED;
int ldlm_flock_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
void *data, int flag);
LDLM_DEBUG(lock, "ldlm_flock_destroy(mode: %d, flags: 0x%x)",
mode, flags);
+ /* Safe to not lock here, since it should be empty anyway */
LASSERT(list_empty(&lock->l_flock_waitq));
list_del_init(&lock->l_res_link);
- if (flags == LDLM_FL_WAIT_NOREPROC) {
+ if (flags == LDLM_FL_WAIT_NOREPROC &&
+ !(lock->l_flags & LDLM_FL_FAILED)) {
/* client side - set a flag to prevent sending a CANCEL */
lock->l_flags |= LDLM_FL_LOCAL_ONLY | LDLM_FL_CBPENDING;
- ldlm_lock_decref_internal(lock, mode);
+
+ /* when reaching here, it is under lock_res_and_lock(). Thus,
+ need call the nolock version of ldlm_lock_decref_internal*/
+ ldlm_lock_decref_internal_nolock(lock, mode);
}
ldlm_lock_destroy_nolock(lock);
pid_t blocking_pid = blocking_lock->l_policy_data.l_flock.pid;
struct ldlm_lock *lock;
+ spin_lock(&ldlm_flock_waitq_lock);
restart:
list_for_each_entry(lock, &ldlm_flock_waitq, l_flock_waitq) {
if ((lock->l_policy_data.l_flock.pid != blocking_pid) ||
blocking_pid = lock->l_policy_data.l_flock.blocking_pid;
blocking_export = (struct obd_export *)(long)
lock->l_policy_data.l_flock.blocking_export;
- if (blocking_pid == req_pid && blocking_export == req_export)
+ if (blocking_pid == req_pid && blocking_export == req_export) {
+ spin_unlock(&ldlm_flock_waitq_lock);
return 1;
+ }
goto restart;
}
+ spin_unlock(&ldlm_flock_waitq_lock);
return 0;
}
struct ldlm_lock *new = req;
struct ldlm_lock *new2 = NULL;
ldlm_mode_t mode = req->l_req_mode;
- int local = ns->ns_client;
+ int local = ns_is_client(ns);
int added = (mode == LCK_NL);
int overlaps = 0;
+ int splitted = 0;
+ const struct ldlm_callback_suite null_cbs = { NULL };
ENTRY;
CDEBUG(D_DLMTRACE, "flags %#x pid %u mode %u start "LPU64" end "LPU64
req->l_blocking_ast = ldlm_flock_blocking_ast;
}
+reprocess:
if ((*flags == LDLM_FL_WAIT_NOREPROC) || (mode == LCK_NL)) {
/* This loop determines where this processes locks start
* in the resource lr_granted list. */
(long)(void *)lock->l_export;
LASSERT(list_empty(&req->l_flock_waitq));
+ spin_lock(&ldlm_flock_waitq_lock);
list_add_tail(&req->l_flock_waitq, &ldlm_flock_waitq);
+ spin_unlock(&ldlm_flock_waitq_lock);
ldlm_resource_add_lock(res, &res->lr_waiting, req);
*flags |= LDLM_FL_BLOCK_GRANTED;
/* In case we had slept on this lock request take it off of the
* deadlock detection waitq. */
+ spin_lock(&ldlm_flock_waitq_lock);
list_del_init(&req->l_flock_waitq);
+ spin_unlock(&ldlm_flock_waitq_lock);
/* Scan the locks owned by this process that overlap this request.
* We may have to merge or split existing locks. */
/* XXX - if ldlm_lock_new() can sleep we should
* release the ns_lock, allocate the new lock,
* and restart processing this lock. */
- new2 = ldlm_lock_create(ns, NULL, res->lr_name, LDLM_FLOCK,
- lock->l_granted_mode, NULL, NULL, NULL,
- NULL, 0);
if (!new2) {
- ldlm_flock_destroy(req, lock->l_granted_mode, *flags);
- *err = -ENOLCK;
- RETURN(LDLM_ITER_STOP);
+ unlock_res_and_lock(req);
+ new2 = ldlm_lock_create(ns, &res->lr_name, LDLM_FLOCK,
+ lock->l_granted_mode, &null_cbs,
+ NULL, 0);
+ lock_res_and_lock(req);
+ if (!new2) {
+ ldlm_flock_destroy(req, lock->l_granted_mode,
+ *flags);
+ *err = -ENOLCK;
+ RETURN(LDLM_ITER_STOP);
+ }
+ goto reprocess;
}
+ splitted = 1;
+
new2->l_granted_mode = lock->l_granted_mode;
new2->l_policy_data.l_flock.pid =
new->l_policy_data.l_flock.pid;
new2->l_conn_export = lock->l_conn_export;
if (lock->l_export != NULL) {
new2->l_export = class_export_get(lock->l_export);
- spin_lock(&new2->l_export->exp_ldlm_data.led_lock);
- list_add(&new2->l_export_chain,
- &new2->l_export->exp_ldlm_data.led_held_locks);
- spin_unlock(&new2->l_export->exp_ldlm_data.led_lock);
+ if (new2->l_export->exp_lock_hash &&
+ hlist_unhashed(&new2->l_exp_hash))
+ lustre_hash_add(new2->l_export->exp_lock_hash,
+ &new2->l_remote_handle,
+ &new2->l_exp_hash);
}
if (*flags == LDLM_FL_WAIT_NOREPROC)
- ldlm_lock_addref_internal(new2, lock->l_granted_mode);
+ ldlm_lock_addref_internal_nolock(new2,
+ lock->l_granted_mode);
/* insert new2 at lock */
ldlm_resource_add_lock(res, ownlocks, new2);
- LDLM_LOCK_PUT(new2);
+ LDLM_LOCK_RELEASE(new2);
break;
}
+ /* if new2 is created but never used, destroy it*/
+ if (splitted == 0 && new2 != NULL)
+ ldlm_lock_destroy_nolock(new2);
+
/* At this point we're granting the lock request. */
req->l_granted_mode = req->l_req_mode;
if (*flags != LDLM_FL_WAIT_NOREPROC) {
if (first_enq) {
/* If this is an unlock, reprocess the waitq and
- * send completions ASTs for locks that can now be
+ * send completions ASTs for locks that can now be
* granted. The only problem with doing this
* reprocessing here is that the completion ASTs for
* newly granted locks will be sent before the unlock
* but only once because first_enq will be false from
* ldlm_reprocess_queue. */
if ((mode == LCK_NL) && overlaps) {
- struct list_head rpc_list
- = CFS_LIST_HEAD_INIT(rpc_list);
+ CFS_LIST_HEAD(rpc_list);
int rc;
restart:
ldlm_reprocess_queue(res, &res->lr_waiting,
&rpc_list);
- unlock_res(res);
- rc = ldlm_run_bl_ast_work(&rpc_list);
- lock_res(res);
+ unlock_res_and_lock(req);
+ rc = ldlm_run_ast_work(&rpc_list,
+ LDLM_WORK_CP_AST);
+ lock_res_and_lock(req);
if (rc == -ERESTART)
GOTO(restart, -ERESTART);
}
if (added)
ldlm_flock_destroy(req, mode, *flags);
- ldlm_resource_dump(D_OTHER, res);
+ ldlm_resource_dump(D_INFO, res);
RETURN(LDLM_ITER_CONTINUE);
}
{
struct ldlm_lock *lock;
struct lustre_handle lockh;
+ int rc;
ENTRY;
lock = ((struct ldlm_flock_wait_data *)data)->fwd_lock;
/* take lock off the deadlock detection waitq. */
+ spin_lock(&ldlm_flock_waitq_lock);
list_del_init(&lock->l_flock_waitq);
+ spin_unlock(&ldlm_flock_waitq_lock);
/* client side - set flag to prevent lock from being put on lru list */
lock->l_flags |= LDLM_FL_CBPENDING;
ldlm_lock_decref_internal(lock, lock->l_req_mode);
ldlm_lock2handle(lock, &lockh);
- /* coverity[check_return] */
- ldlm_cli_cancel(&lockh);
+ rc = ldlm_cli_cancel(&lockh);
+ if (rc != ELDLM_OK)
+ CERROR("ldlm_cli_cancel: %d\n", rc);
+
EXIT;
}
+/**
+ * Flock completion calback function.
+ *
+ * \param lock [in,out]: A lock to be handled
+ * \param flags [in]: flags
+ * \param *data [in]: ldlm_work_cp_ast_lock() will use ldlm_cb_set_arg
+ *
+ * \retval 0 : success
+ * \retval <0 : failure
+ */
int
ldlm_flock_completion_ast(struct ldlm_lock *lock, int flags, void *data)
{
- struct ldlm_namespace *ns;
- cfs_flock_t *getlk = lock->l_ast_data;
- struct ldlm_flock_wait_data fwd;
- struct obd_device *obd;
- struct obd_import *imp = NULL;
- ldlm_error_t err;
- int rc = 0;
- struct l_wait_info lwi;
+ cfs_flock_t *getlk = lock->l_ast_data;
+ struct obd_device *obd;
+ struct obd_import *imp = NULL;
+ struct ldlm_flock_wait_data fwd;
+ struct l_wait_info lwi;
+ ldlm_error_t err;
+ int rc = 0;
ENTRY;
CDEBUG(D_DLMTRACE, "flags: 0x%x data: %p getlk: %p\n",
flags, data, getlk);
+ /* Import invalidation. We need to actually release the lock
+ * references being held, so that it can go away. No point in
+ * holding the lock even if app still believes it has it, since
+ * server already dropped it anyway. Only for granted locks too. */
+ lock_res_and_lock(lock);
+ if ((lock->l_flags & (LDLM_FL_FAILED|LDLM_FL_LOCAL_ONLY)) ==
+ (LDLM_FL_FAILED|LDLM_FL_LOCAL_ONLY)) {
+ unlock_res_and_lock(lock);
+ if (lock->l_req_mode == lock->l_granted_mode &&
+ lock->l_granted_mode != LCK_NL &&
+ NULL == data)
+ ldlm_lock_decref_internal(lock, lock->l_req_mode);
+ RETURN(0);
+ }
+ unlock_res_and_lock(lock);
+
LASSERT(flags != LDLM_FL_WAIT_NOREPROC);
if (!(flags & (LDLM_FL_BLOCK_WAIT | LDLM_FL_BLOCK_GRANTED |
- LDLM_FL_BLOCK_CONV)))
- goto granted;
+ LDLM_FL_BLOCK_CONV))) {
+ if (NULL == data)
+ /* mds granted the lock in the reply */
+ goto granted;
+ /* CP AST RPC: lock get granted, wake it up */
+ cfs_waitq_signal(&lock->l_waitq);
+ RETURN(0);
+ }
LDLM_DEBUG(lock, "client-side enqueue returned a blocked lock, "
"sleeping");
-
fwd.fwd_lock = lock;
obd = class_exp2obd(lock->l_conn_export);
- /* if this is a local lock, then there is no import */
- if (obd != NULL)
+ /* if this is a local lock, there is no import */
+ if (NULL != obd)
imp = obd->u.cli.cl_import;
- if (imp != NULL) {
+ if (NULL != imp) {
spin_lock(&imp->imp_lock);
fwd.fwd_generation = imp->imp_generation;
spin_unlock(&imp->imp_lock);
lwi = LWI_TIMEOUT_INTR(0, NULL, ldlm_flock_interrupted_wait, &fwd);
/* Go to sleep until the lock is granted. */
- rc = l_wait_event(lock->l_waitq,
- ((lock->l_req_mode == lock->l_granted_mode) ||
- lock->l_destroyed), &lwi);
+ rc = l_wait_event(lock->l_waitq, is_granted_or_cancelled(lock), &lwi);
+
+ if (rc) {
+ LDLM_DEBUG(lock, "client-side enqueue waking up: failed (%d)",
+ rc);
+ RETURN(rc);
+ }
- LDLM_DEBUG(lock, "client-side enqueue waking up: rc = %d", rc);
- RETURN(rc);
-
granted:
+ OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_CP_CB_WAIT, 10);
+
+ lock_res_and_lock(lock);
+ if (lock->l_destroyed || lock->l_flags & LDLM_FL_FAILED) {
+ LDLM_DEBUG(lock, "client-side enqueue waking up: destroyed");
+ unlock_res(lock->l_resource);
+ RETURN(-EIO);
+ }
+ if (rc) {
+ LDLM_DEBUG(lock, "client-side enqueue waking up: failed (%d)",
+ rc);
+ unlock_res_and_lock(lock);
+ RETURN(rc);
+ }
LDLM_DEBUG(lock, "client-side enqueue granted");
- ns = lock->l_resource->lr_namespace;
- lock_res(lock->l_resource);
/* take lock off the deadlock detection waitq. */
+ spin_lock(&ldlm_flock_waitq_lock);
list_del_init(&lock->l_flock_waitq);
+ spin_unlock(&ldlm_flock_waitq_lock);
/* ldlm_lock_enqueue() has already placed lock on the granted list. */
list_del_init(&lock->l_res_link);
if (flags & LDLM_FL_TEST_LOCK) {
/* fcntl(F_GETLK) request */
/* The old mode was saved in getlk->fl_type so that if the mode
- * in the lock changes we can decref the approprate refcount. */
- ldlm_flock_destroy(lock, cfs_flock_type(getlk), LDLM_FL_WAIT_NOREPROC);
+ * in the lock changes we can decref the appropriate refcount.*/
+ ldlm_flock_destroy(lock, cfs_flock_type(getlk),
+ LDLM_FL_WAIT_NOREPROC);
switch (lock->l_granted_mode) {
case LCK_PR:
cfs_flock_set_type(getlk, F_RDLCK);
default:
cfs_flock_set_type(getlk, F_UNLCK);
}
- cfs_flock_set_pid(getlk, (pid_t)lock->l_policy_data.l_flock.pid);
- cfs_flock_set_start(getlk, (off_t)lock->l_policy_data.l_flock.start);
- cfs_flock_set_end(getlk, (off_t)lock->l_policy_data.l_flock.end);
+ cfs_flock_set_pid(getlk,
+ (pid_t)lock->l_policy_data.l_flock.pid);
+ cfs_flock_set_start(getlk,
+ (loff_t)lock->l_policy_data.l_flock.start);
+ cfs_flock_set_end(getlk,
+ (loff_t)lock->l_policy_data.l_flock.end);
} else {
int noreproc = LDLM_FL_WAIT_NOREPROC;
/* We need to reprocess the lock to do merges or splits
* with existing locks owned by this process. */
ldlm_process_flock_lock(lock, &noreproc, 1, &err, NULL);
- if (flags == 0)
- cfs_waitq_signal(&lock->l_waitq);
}
- unlock_res(lock->l_resource);
+ unlock_res_and_lock(lock);
RETURN(0);
}
EXPORT_SYMBOL(ldlm_flock_completion_ast);
ns = lock->l_resource->lr_namespace;
/* take lock off the deadlock detection waitq. */
- lock_res_and_lock(lock);
+ spin_lock(&ldlm_flock_waitq_lock);
list_del_init(&lock->l_flock_waitq);
- unlock_res_and_lock(lock);
+ spin_unlock(&ldlm_flock_waitq_lock);
RETURN(0);
}