/* -*- 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
+/**
+ * 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,
/**
* list_for_remaining_safe - iterate over the remaining entries in a list
* and safeguard against removal of a list entry.
- * @pos: the &struct list_head to use as a loop counter. pos MUST
+ * \param pos the &struct list_head to use as a loop counter. pos MUST
* have been initialized prior to using it in this macro.
- * @n: another &struct list_head to use as temporary storage
- * @head: the head for your list.
+ * \param n another &struct list_head to use as temporary storage
+ * \param head the head for your list.
*/
#define list_for_remaining_safe(pos, n, head) \
for (n = pos->next; pos != (head); pos = n, n = pos->next)
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);
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. */
/* 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, &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;
new->l_policy_data.l_flock.end + 1;
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);
+ new2->l_export = class_export_lock_get(lock->l_export);
+ 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;
ldlm_reprocess_queue(res, &res->lr_waiting,
&rpc_list);
- unlock_res(res);
- rc = ldlm_run_ast_work(&rpc_list, LDLM_WORK_BL_AST);
- 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);
}
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",
* 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)) ==
+ 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)
+ lock->l_granted_mode != LCK_NL &&
+ NULL == data)
ldlm_lock_decref_internal(lock, lock->l_req_mode);
RETURN(0);
}
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);
- LDLM_DEBUG(lock, "client-side enqueue waking up: rc = %d", rc);
- RETURN(rc);
+ if (rc) {
+ LDLM_DEBUG(lock, "client-side enqueue waking up: failed (%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);
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, (loff_t)lock->l_policy_data.l_flock.start);
- cfs_flock_set_end(getlk, (loff_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);
git://git.whamcloud.com / fs / lustre-release.git / blobdiff