--- /dev/null
+/*
+ * GPL HEADER START
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * 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.
+ *
+ * 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).
+ *
+ * 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 (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2010, 2012, Intel Corporation.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ *
+ * lustre/ldlm/ldlm_lock.c
+ *
+ * Author: Peter Braam <braam@clusterfs.com>
+ * Author: Phil Schwan <phil@clusterfs.com>
+ */
+
+#define DEBUG_SUBSYSTEM S_LDLM
+
+#include "../../include/linux/libcfs/libcfs.h"
+#include "../include/lustre_intent.h"
+#include "../include/obd_class.h"
+#include "ldlm_internal.h"
+
+/* lock types */
+char *ldlm_lockname[] = {
+ [0] = "--",
+ [LCK_EX] = "EX",
+ [LCK_PW] = "PW",
+ [LCK_PR] = "PR",
+ [LCK_CW] = "CW",
+ [LCK_CR] = "CR",
+ [LCK_NL] = "NL",
+ [LCK_GROUP] = "GROUP",
+ [LCK_COS] = "COS",
+};
+EXPORT_SYMBOL(ldlm_lockname);
+
+char *ldlm_typename[] = {
+ [LDLM_PLAIN] = "PLN",
+ [LDLM_EXTENT] = "EXT",
+ [LDLM_FLOCK] = "FLK",
+ [LDLM_IBITS] = "IBT",
+};
+EXPORT_SYMBOL(ldlm_typename);
+
+static ldlm_policy_wire_to_local_t ldlm_policy_wire18_to_local[] = {
+ [LDLM_PLAIN - LDLM_MIN_TYPE] = ldlm_plain_policy_wire_to_local,
+ [LDLM_EXTENT - LDLM_MIN_TYPE] = ldlm_extent_policy_wire_to_local,
+ [LDLM_FLOCK - LDLM_MIN_TYPE] = ldlm_flock_policy_wire18_to_local,
+ [LDLM_IBITS - LDLM_MIN_TYPE] = ldlm_ibits_policy_wire_to_local,
+};
+
+static ldlm_policy_wire_to_local_t ldlm_policy_wire21_to_local[] = {
+ [LDLM_PLAIN - LDLM_MIN_TYPE] = ldlm_plain_policy_wire_to_local,
+ [LDLM_EXTENT - LDLM_MIN_TYPE] = ldlm_extent_policy_wire_to_local,
+ [LDLM_FLOCK - LDLM_MIN_TYPE] = ldlm_flock_policy_wire21_to_local,
+ [LDLM_IBITS - LDLM_MIN_TYPE] = ldlm_ibits_policy_wire_to_local,
+};
+
+static ldlm_policy_local_to_wire_t ldlm_policy_local_to_wire[] = {
+ [LDLM_PLAIN - LDLM_MIN_TYPE] = ldlm_plain_policy_local_to_wire,
+ [LDLM_EXTENT - LDLM_MIN_TYPE] = ldlm_extent_policy_local_to_wire,
+ [LDLM_FLOCK - LDLM_MIN_TYPE] = ldlm_flock_policy_local_to_wire,
+ [LDLM_IBITS - LDLM_MIN_TYPE] = ldlm_ibits_policy_local_to_wire,
+};
+
+/**
+ * Converts lock policy from local format to on the wire lock_desc format
+ */
+void ldlm_convert_policy_to_wire(ldlm_type_t type,
+ const ldlm_policy_data_t *lpolicy,
+ ldlm_wire_policy_data_t *wpolicy)
+{
+ ldlm_policy_local_to_wire_t convert;
+
+ convert = ldlm_policy_local_to_wire[type - LDLM_MIN_TYPE];
+
+ convert(lpolicy, wpolicy);
+}
+
+/**
+ * Converts lock policy from on the wire lock_desc format to local format
+ */
+void ldlm_convert_policy_to_local(struct obd_export *exp, ldlm_type_t type,
+ const ldlm_wire_policy_data_t *wpolicy,
+ ldlm_policy_data_t *lpolicy)
+{
+ ldlm_policy_wire_to_local_t convert;
+ int new_client;
+
+ /** some badness for 2.0.0 clients, but 2.0.0 isn't supported */
+ new_client = (exp_connect_flags(exp) & OBD_CONNECT_FULL20) != 0;
+ if (new_client)
+ convert = ldlm_policy_wire21_to_local[type - LDLM_MIN_TYPE];
+ else
+ convert = ldlm_policy_wire18_to_local[type - LDLM_MIN_TYPE];
+
+ convert(wpolicy, lpolicy);
+}
+
+char *ldlm_it2str(int it)
+{
+ switch (it) {
+ case IT_OPEN:
+ return "open";
+ case IT_CREAT:
+ return "creat";
+ case (IT_OPEN | IT_CREAT):
+ return "open|creat";
+ case IT_READDIR:
+ return "readdir";
+ case IT_GETATTR:
+ return "getattr";
+ case IT_LOOKUP:
+ return "lookup";
+ case IT_UNLINK:
+ return "unlink";
+ case IT_GETXATTR:
+ return "getxattr";
+ case IT_LAYOUT:
+ return "layout";
+ default:
+ CERROR("Unknown intent %d\n", it);
+ return "UNKNOWN";
+ }
+}
+EXPORT_SYMBOL(ldlm_it2str);
+
+
+void ldlm_register_intent(struct ldlm_namespace *ns, ldlm_res_policy arg)
+{
+ ns->ns_policy = arg;
+}
+EXPORT_SYMBOL(ldlm_register_intent);
+
+/*
+ * REFCOUNTED LOCK OBJECTS
+ */
+
+
+/**
+ * Get a reference on a lock.
+ *
+ * Lock refcounts, during creation:
+ * - one special one for allocation, dec'd only once in destroy
+ * - one for being a lock that's in-use
+ * - one for the addref associated with a new lock
+ */
+struct ldlm_lock *ldlm_lock_get(struct ldlm_lock *lock)
+{
+ atomic_inc(&lock->l_refc);
+ return lock;
+}
+EXPORT_SYMBOL(ldlm_lock_get);
+
+/**
+ * Release lock reference.
+ *
+ * Also frees the lock if it was last reference.
+ */
+void ldlm_lock_put(struct ldlm_lock *lock)
+{
+ LASSERT(lock->l_resource != LP_POISON);
+ LASSERT(atomic_read(&lock->l_refc) > 0);
+ if (atomic_dec_and_test(&lock->l_refc)) {
+ struct ldlm_resource *res;
+
+ LDLM_DEBUG(lock,
+ "final lock_put on destroyed lock, freeing it.");
+
+ res = lock->l_resource;
+ LASSERT(lock->l_flags & LDLM_FL_DESTROYED);
+ LASSERT(list_empty(&lock->l_res_link));
+ LASSERT(list_empty(&lock->l_pending_chain));
+
+ lprocfs_counter_decr(ldlm_res_to_ns(res)->ns_stats,
+ LDLM_NSS_LOCKS);
+ lu_ref_del(&res->lr_reference, "lock", lock);
+ ldlm_resource_putref(res);
+ lock->l_resource = NULL;
+ if (lock->l_export) {
+ class_export_lock_put(lock->l_export, lock);
+ lock->l_export = NULL;
+ }
+
+ if (lock->l_lvb_data != NULL)
+ OBD_FREE(lock->l_lvb_data, lock->l_lvb_len);
+
+ ldlm_interval_free(ldlm_interval_detach(lock));
+ lu_ref_fini(&lock->l_reference);
+ OBD_FREE_RCU(lock, sizeof(*lock), &lock->l_handle);
+ }
+}
+EXPORT_SYMBOL(ldlm_lock_put);
+
+/**
+ * Removes LDLM lock \a lock from LRU. Assumes LRU is already locked.
+ */
+int ldlm_lock_remove_from_lru_nolock(struct ldlm_lock *lock)
+{
+ int rc = 0;
+
+ if (!list_empty(&lock->l_lru)) {
+ struct ldlm_namespace *ns = ldlm_lock_to_ns(lock);
+
+ LASSERT(lock->l_resource->lr_type != LDLM_FLOCK);
+ list_del_init(&lock->l_lru);
+ LASSERT(ns->ns_nr_unused > 0);
+ ns->ns_nr_unused--;
+ rc = 1;
+ }
+ return rc;
+}
+
+/**
+ * Removes LDLM lock \a lock from LRU. Obtains the LRU lock first.
+ */
+int ldlm_lock_remove_from_lru(struct ldlm_lock *lock)
+{
+ struct ldlm_namespace *ns = ldlm_lock_to_ns(lock);
+ int rc;
+
+ if (lock->l_flags & LDLM_FL_NS_SRV) {
+ LASSERT(list_empty(&lock->l_lru));
+ return 0;
+ }
+
+ spin_lock(&ns->ns_lock);
+ rc = ldlm_lock_remove_from_lru_nolock(lock);
+ spin_unlock(&ns->ns_lock);
+ return rc;
+}
+
+/**
+ * Adds LDLM lock \a lock to namespace LRU. Assumes LRU is already locked.
+ */
+void ldlm_lock_add_to_lru_nolock(struct ldlm_lock *lock)
+{
+ struct ldlm_namespace *ns = ldlm_lock_to_ns(lock);
+
+ lock->l_last_used = cfs_time_current();
+ LASSERT(list_empty(&lock->l_lru));
+ LASSERT(lock->l_resource->lr_type != LDLM_FLOCK);
+ list_add_tail(&lock->l_lru, &ns->ns_unused_list);
+ if (lock->l_flags & LDLM_FL_SKIPPED)
+ lock->l_flags &= ~LDLM_FL_SKIPPED;
+ LASSERT(ns->ns_nr_unused >= 0);
+ ns->ns_nr_unused++;
+}
+
+/**
+ * Adds LDLM lock \a lock to namespace LRU. Obtains necessary LRU locks
+ * first.
+ */
+void ldlm_lock_add_to_lru(struct ldlm_lock *lock)
+{
+ struct ldlm_namespace *ns = ldlm_lock_to_ns(lock);
+
+ spin_lock(&ns->ns_lock);
+ ldlm_lock_add_to_lru_nolock(lock);
+ spin_unlock(&ns->ns_lock);
+}
+
+/**
+ * Moves LDLM lock \a lock that is already in namespace LRU to the tail of
+ * the LRU. Performs necessary LRU locking
+ */
+void ldlm_lock_touch_in_lru(struct ldlm_lock *lock)
+{
+ struct ldlm_namespace *ns = ldlm_lock_to_ns(lock);
+
+ if (lock->l_flags & LDLM_FL_NS_SRV) {
+ LASSERT(list_empty(&lock->l_lru));
+ return;
+ }
+
+ spin_lock(&ns->ns_lock);
+ if (!list_empty(&lock->l_lru)) {
+ ldlm_lock_remove_from_lru_nolock(lock);
+ ldlm_lock_add_to_lru_nolock(lock);
+ }
+ spin_unlock(&ns->ns_lock);
+}
+
+/**
+ * Helper to destroy a locked lock.
+ *
+ * Used by ldlm_lock_destroy and ldlm_lock_destroy_nolock
+ * Must be called with l_lock and lr_lock held.
+ *
+ * Does not actually free the lock data, but rather marks the lock as
+ * destroyed by setting l_destroyed field in the lock to 1. Destroys a
+ * handle->lock association too, so that the lock can no longer be found
+ * and removes the lock from LRU list. Actual lock freeing occurs when
+ * last lock reference goes away.
+ *
+ * Original comment (of some historical value):
+ * This used to have a 'strict' flag, which recovery would use to mark an
+ * in-use lock as needing-to-die. Lest I am ever tempted to put it back, I
+ * shall explain why it's gone: with the new hash table scheme, once you call
+ * ldlm_lock_destroy, you can never drop your final references on this lock.
+ * Because it's not in the hash table anymore. -phil
+ */
+int ldlm_lock_destroy_internal(struct ldlm_lock *lock)
+{
+ if (lock->l_readers || lock->l_writers) {
+ LDLM_ERROR(lock, "lock still has references");
+ LBUG();
+ }
+
+ if (!list_empty(&lock->l_res_link)) {
+ LDLM_ERROR(lock, "lock still on resource");
+ LBUG();
+ }
+
+ if (lock->l_flags & LDLM_FL_DESTROYED) {
+ LASSERT(list_empty(&lock->l_lru));
+ return 0;
+ }
+ lock->l_flags |= LDLM_FL_DESTROYED;
+
+ if (lock->l_export && lock->l_export->exp_lock_hash) {
+ /* NB: it's safe to call cfs_hash_del() even lock isn't
+ * in exp_lock_hash. */
+ /* In the function below, .hs_keycmp resolves to
+ * ldlm_export_lock_keycmp() */
+ /* coverity[overrun-buffer-val] */
+ cfs_hash_del(lock->l_export->exp_lock_hash,
+ &lock->l_remote_handle, &lock->l_exp_hash);
+ }
+
+ ldlm_lock_remove_from_lru(lock);
+ class_handle_unhash(&lock->l_handle);
+
+#if 0
+ /* Wake anyone waiting for this lock */
+ /* FIXME: I should probably add yet another flag, instead of using
+ * l_export to only call this on clients */
+ if (lock->l_export)
+ class_export_put(lock->l_export);
+ lock->l_export = NULL;
+ if (lock->l_export && lock->l_completion_ast)
+ lock->l_completion_ast(lock, 0);
+#endif
+ return 1;
+}
+
+/**
+ * Destroys a LDLM lock \a lock. Performs necessary locking first.
+ */
+void ldlm_lock_destroy(struct ldlm_lock *lock)
+{
+ int first;
+
+ lock_res_and_lock(lock);
+ first = ldlm_lock_destroy_internal(lock);
+ unlock_res_and_lock(lock);
+
+ /* drop reference from hashtable only for first destroy */
+ if (first) {
+ lu_ref_del(&lock->l_reference, "hash", lock);
+ LDLM_LOCK_RELEASE(lock);
+ }
+}
+
+/**
+ * Destroys a LDLM lock \a lock that is already locked.
+ */
+void ldlm_lock_destroy_nolock(struct ldlm_lock *lock)
+{
+ int first;
+
+ first = ldlm_lock_destroy_internal(lock);
+ /* drop reference from hashtable only for first destroy */
+ if (first) {
+ lu_ref_del(&lock->l_reference, "hash", lock);
+ LDLM_LOCK_RELEASE(lock);
+ }
+}
+
+/* this is called by portals_handle2object with the handle lock taken */
+static void lock_handle_addref(void *lock)
+{
+ LDLM_LOCK_GET((struct ldlm_lock *)lock);
+}
+
+static void lock_handle_free(void *lock, int size)
+{
+ LASSERT(size == sizeof(struct ldlm_lock));
+ OBD_SLAB_FREE(lock, ldlm_lock_slab, size);
+}
+
+struct portals_handle_ops lock_handle_ops = {
+ .hop_addref = lock_handle_addref,
+ .hop_free = lock_handle_free,
+};
+
+/**
+ *
+ * Allocate and initialize new lock structure.
+ *
+ * usage: pass in a resource on which you have done ldlm_resource_get
+ * new lock will take over the refcount.
+ * returns: lock with refcount 2 - one for current caller and one for remote
+ */
+static struct ldlm_lock *ldlm_lock_new(struct ldlm_resource *resource)
+{
+ struct ldlm_lock *lock;
+
+ if (resource == NULL)
+ LBUG();
+
+ OBD_SLAB_ALLOC_PTR_GFP(lock, ldlm_lock_slab, GFP_NOFS);
+ if (lock == NULL)
+ return NULL;
+
+ spin_lock_init(&lock->l_lock);
+ lock->l_resource = resource;
+ lu_ref_add(&resource->lr_reference, "lock", lock);
+
+ atomic_set(&lock->l_refc, 2);
+ INIT_LIST_HEAD(&lock->l_res_link);
+ INIT_LIST_HEAD(&lock->l_lru);
+ INIT_LIST_HEAD(&lock->l_pending_chain);
+ INIT_LIST_HEAD(&lock->l_bl_ast);
+ INIT_LIST_HEAD(&lock->l_cp_ast);
+ INIT_LIST_HEAD(&lock->l_rk_ast);
+ init_waitqueue_head(&lock->l_waitq);
+ lock->l_blocking_lock = NULL;
+ INIT_LIST_HEAD(&lock->l_sl_mode);
+ INIT_LIST_HEAD(&lock->l_sl_policy);
+ INIT_HLIST_NODE(&lock->l_exp_hash);
+ INIT_HLIST_NODE(&lock->l_exp_flock_hash);
+
+ lprocfs_counter_incr(ldlm_res_to_ns(resource)->ns_stats,
+ LDLM_NSS_LOCKS);
+ INIT_LIST_HEAD(&lock->l_handle.h_link);
+ class_handle_hash(&lock->l_handle, &lock_handle_ops);
+
+ lu_ref_init(&lock->l_reference);
+ lu_ref_add(&lock->l_reference, "hash", lock);
+ lock->l_callback_timeout = 0;
+
+#if LUSTRE_TRACKS_LOCK_EXP_REFS
+ INIT_LIST_HEAD(&lock->l_exp_refs_link);
+ lock->l_exp_refs_nr = 0;
+ lock->l_exp_refs_target = NULL;
+#endif
+ INIT_LIST_HEAD(&lock->l_exp_list);
+
+ return lock;
+}
+
+/**
+ * Moves LDLM lock \a lock to another resource.
+ * This is used on client when server returns some other lock than requested
+ * (typically as a result of intent operation)
+ */
+int ldlm_lock_change_resource(struct ldlm_namespace *ns, struct ldlm_lock *lock,
+ const struct ldlm_res_id *new_resid)
+{
+ struct ldlm_resource *oldres = lock->l_resource;
+ struct ldlm_resource *newres;
+ int type;
+
+ LASSERT(ns_is_client(ns));
+
+ lock_res_and_lock(lock);
+ if (memcmp(new_resid, &lock->l_resource->lr_name,
+ sizeof(lock->l_resource->lr_name)) == 0) {
+ /* Nothing to do */
+ unlock_res_and_lock(lock);
+ return 0;
+ }
+
+ LASSERT(new_resid->name[0] != 0);
+
+ /* This function assumes that the lock isn't on any lists */
+ LASSERT(list_empty(&lock->l_res_link));
+
+ type = oldres->lr_type;
+ unlock_res_and_lock(lock);
+
+ newres = ldlm_resource_get(ns, NULL, new_resid, type, 1);
+ if (newres == NULL)
+ return -ENOMEM;
+
+ lu_ref_add(&newres->lr_reference, "lock", lock);
+ /*
+ * To flip the lock from the old to the new resource, lock, oldres and
+ * newres have to be locked. Resource spin-locks are nested within
+ * lock->l_lock, and are taken in the memory address order to avoid
+ * dead-locks.
+ */
+ spin_lock(&lock->l_lock);
+ oldres = lock->l_resource;
+ if (oldres < newres) {
+ lock_res(oldres);
+ lock_res_nested(newres, LRT_NEW);
+ } else {
+ lock_res(newres);
+ lock_res_nested(oldres, LRT_NEW);
+ }
+ LASSERT(memcmp(new_resid, &oldres->lr_name,
+ sizeof(oldres->lr_name)) != 0);
+ lock->l_resource = newres;
+ unlock_res(oldres);
+ unlock_res_and_lock(lock);
+
+ /* ...and the flowers are still standing! */
+ lu_ref_del(&oldres->lr_reference, "lock", lock);
+ ldlm_resource_putref(oldres);
+
+ return 0;
+}
+EXPORT_SYMBOL(ldlm_lock_change_resource);
+
+/** \defgroup ldlm_handles LDLM HANDLES
+ * Ways to get hold of locks without any addresses.
+ * @{
+ */
+
+/**
+ * Fills in handle for LDLM lock \a lock into supplied \a lockh
+ * Does not take any references.
+ */
+void ldlm_lock2handle(const struct ldlm_lock *lock, struct lustre_handle *lockh)
+{
+ lockh->cookie = lock->l_handle.h_cookie;
+}
+EXPORT_SYMBOL(ldlm_lock2handle);
+
+/**
+ * Obtain a lock reference by handle.
+ *
+ * if \a flags: atomically get the lock and set the flags.
+ * Return NULL if flag already set
+ */
+struct ldlm_lock *__ldlm_handle2lock(const struct lustre_handle *handle,
+ __u64 flags)
+{
+ struct ldlm_lock *lock;
+
+ LASSERT(handle);
+
+ lock = class_handle2object(handle->cookie);
+ if (lock == NULL)
+ return NULL;
+
+ /* It's unlikely but possible that someone marked the lock as
+ * destroyed after we did handle2object on it */
+ if (flags == 0 && ((lock->l_flags & LDLM_FL_DESTROYED) == 0)) {
+ lu_ref_add(&lock->l_reference, "handle", current);
+ return lock;
+ }
+
+ lock_res_and_lock(lock);
+
+ LASSERT(lock->l_resource != NULL);
+
+ lu_ref_add_atomic(&lock->l_reference, "handle", current);
+ if (unlikely(lock->l_flags & LDLM_FL_DESTROYED)) {
+ unlock_res_and_lock(lock);
+ CDEBUG(D_INFO, "lock already destroyed: lock %p\n", lock);
+ LDLM_LOCK_PUT(lock);
+ return NULL;
+ }
+
+ if (flags && (lock->l_flags & flags)) {
+ unlock_res_and_lock(lock);
+ LDLM_LOCK_PUT(lock);
+ return NULL;
+ }
+
+ if (flags)
+ lock->l_flags |= flags;
+
+ unlock_res_and_lock(lock);
+ return lock;
+}
+EXPORT_SYMBOL(__ldlm_handle2lock);
+/** @} ldlm_handles */
+
+/**
+ * Fill in "on the wire" representation for given LDLM lock into supplied
+ * lock descriptor \a desc structure.
+ */
+void ldlm_lock2desc(struct ldlm_lock *lock, struct ldlm_lock_desc *desc)
+{
+ ldlm_res2desc(lock->l_resource, &desc->l_resource);
+ desc->l_req_mode = lock->l_req_mode;
+ desc->l_granted_mode = lock->l_granted_mode;
+ ldlm_convert_policy_to_wire(lock->l_resource->lr_type,
+ &lock->l_policy_data,
+ &desc->l_policy_data);
+}
+EXPORT_SYMBOL(ldlm_lock2desc);
+
+/**
+ * Add a lock to list of conflicting locks to send AST to.
+ *
+ * Only add if we have not sent a blocking AST to the lock yet.
+ */
+void ldlm_add_bl_work_item(struct ldlm_lock *lock, struct ldlm_lock *new,
+ struct list_head *work_list)
+{
+ if ((lock->l_flags & LDLM_FL_AST_SENT) == 0) {
+ LDLM_DEBUG(lock, "lock incompatible; sending blocking AST.");
+ lock->l_flags |= LDLM_FL_AST_SENT;
+ /* If the enqueuing client said so, tell the AST recipient to
+ * discard dirty data, rather than writing back. */
+ if (new->l_flags & LDLM_FL_AST_DISCARD_DATA)
+ lock->l_flags |= LDLM_FL_DISCARD_DATA;
+ LASSERT(list_empty(&lock->l_bl_ast));
+ list_add(&lock->l_bl_ast, work_list);
+ LDLM_LOCK_GET(lock);
+ LASSERT(lock->l_blocking_lock == NULL);
+ lock->l_blocking_lock = LDLM_LOCK_GET(new);
+ }
+}
+
+/**
+ * Add a lock to list of just granted locks to send completion AST to.
+ */
+void ldlm_add_cp_work_item(struct ldlm_lock *lock, struct list_head *work_list)
+{
+ if ((lock->l_flags & LDLM_FL_CP_REQD) == 0) {
+ lock->l_flags |= LDLM_FL_CP_REQD;
+ LDLM_DEBUG(lock, "lock granted; sending completion AST.");
+ LASSERT(list_empty(&lock->l_cp_ast));
+ list_add(&lock->l_cp_ast, work_list);
+ LDLM_LOCK_GET(lock);
+ }
+}
+
+/**
+ * Aggregator function to add AST work items into a list. Determines
+ * what sort of an AST work needs to be done and calls the proper
+ * adding function.
+ * Must be called with lr_lock held.
+ */
+void ldlm_add_ast_work_item(struct ldlm_lock *lock, struct ldlm_lock *new,
+ struct list_head *work_list)
+{
+ check_res_locked(lock->l_resource);
+ if (new)
+ ldlm_add_bl_work_item(lock, new, work_list);
+ else
+ ldlm_add_cp_work_item(lock, work_list);
+}
+
+/**
+ * Add specified reader/writer reference to LDLM lock with handle \a lockh.
+ * r/w reference type is determined by \a mode
+ * Calls ldlm_lock_addref_internal.
+ */
+void ldlm_lock_addref(struct lustre_handle *lockh, __u32 mode)
+{
+ struct ldlm_lock *lock;
+
+ lock = ldlm_handle2lock(lockh);
+ LASSERT(lock != NULL);
+ ldlm_lock_addref_internal(lock, mode);
+ LDLM_LOCK_PUT(lock);
+}
+EXPORT_SYMBOL(ldlm_lock_addref);
+
+/**
+ * Helper function.
+ * Add specified reader/writer reference to LDLM lock \a lock.
+ * r/w reference type is determined by \a mode
+ * Removes lock from LRU if it is there.
+ * Assumes the LDLM lock is already locked.
+ */
+void ldlm_lock_addref_internal_nolock(struct ldlm_lock *lock, __u32 mode)
+{
+ ldlm_lock_remove_from_lru(lock);
+ if (mode & (LCK_NL | LCK_CR | LCK_PR)) {
+ lock->l_readers++;
+ lu_ref_add_atomic(&lock->l_reference, "reader", lock);
+ }
+ if (mode & (LCK_EX | LCK_CW | LCK_PW | LCK_GROUP | LCK_COS)) {
+ lock->l_writers++;
+ lu_ref_add_atomic(&lock->l_reference, "writer", lock);
+ }
+ LDLM_LOCK_GET(lock);
+ lu_ref_add_atomic(&lock->l_reference, "user", lock);
+ LDLM_DEBUG(lock, "ldlm_lock_addref(%s)", ldlm_lockname[mode]);
+}
+
+/**
+ * Attempts to add reader/writer reference to a lock with handle \a lockh, and
+ * fails if lock is already LDLM_FL_CBPENDING or destroyed.
+ *
+ * \retval 0 success, lock was addref-ed
+ *
+ * \retval -EAGAIN lock is being canceled.
+ */
+int ldlm_lock_addref_try(struct lustre_handle *lockh, __u32 mode)
+{
+ struct ldlm_lock *lock;
+ int result;
+
+ result = -EAGAIN;
+ lock = ldlm_handle2lock(lockh);
+ if (lock != NULL) {
+ lock_res_and_lock(lock);
+ if (lock->l_readers != 0 || lock->l_writers != 0 ||
+ !(lock->l_flags & LDLM_FL_CBPENDING)) {
+ ldlm_lock_addref_internal_nolock(lock, mode);
+ result = 0;
+ }
+ unlock_res_and_lock(lock);
+ LDLM_LOCK_PUT(lock);
+ }
+ return result;
+}
+EXPORT_SYMBOL(ldlm_lock_addref_try);
+
+/**
+ * Add specified reader/writer reference to LDLM lock \a lock.
+ * Locks LDLM lock and calls ldlm_lock_addref_internal_nolock to do the work.
+ * Only called for local locks.
+ */
+void ldlm_lock_addref_internal(struct ldlm_lock *lock, __u32 mode)
+{
+ lock_res_and_lock(lock);
+ ldlm_lock_addref_internal_nolock(lock, mode);
+ unlock_res_and_lock(lock);
+}
+
+/**
+ * Removes reader/writer reference for LDLM lock \a lock.
+ * Assumes LDLM lock is already locked.
+ * only called in ldlm_flock_destroy and for local locks.
+ * Does NOT add lock to LRU if no r/w references left to accommodate flock locks
+ * that cannot be placed in LRU.
+ */
+void ldlm_lock_decref_internal_nolock(struct ldlm_lock *lock, __u32 mode)
+{
+ LDLM_DEBUG(lock, "ldlm_lock_decref(%s)", ldlm_lockname[mode]);
+ if (mode & (LCK_NL | LCK_CR | LCK_PR)) {
+ LASSERT(lock->l_readers > 0);
+ lu_ref_del(&lock->l_reference, "reader", lock);
+ lock->l_readers--;
+ }
+ if (mode & (LCK_EX | LCK_CW | LCK_PW | LCK_GROUP | LCK_COS)) {
+ LASSERT(lock->l_writers > 0);
+ lu_ref_del(&lock->l_reference, "writer", lock);
+ lock->l_writers--;
+ }
+
+ lu_ref_del(&lock->l_reference, "user", lock);
+ LDLM_LOCK_RELEASE(lock); /* matches the LDLM_LOCK_GET() in addref */
+}
+
+/**
+ * Removes reader/writer reference for LDLM lock \a lock.
+ * Locks LDLM lock first.
+ * If the lock is determined to be client lock on a client and r/w refcount
+ * drops to zero and the lock is not blocked, the lock is added to LRU lock
+ * on the namespace.
+ * For blocked LDLM locks if r/w count drops to zero, blocking_ast is called.
+ */
+void ldlm_lock_decref_internal(struct ldlm_lock *lock, __u32 mode)
+{
+ struct ldlm_namespace *ns;
+
+ lock_res_and_lock(lock);
+
+ ns = ldlm_lock_to_ns(lock);
+
+ ldlm_lock_decref_internal_nolock(lock, mode);
+
+ if (lock->l_flags & LDLM_FL_LOCAL &&
+ !lock->l_readers && !lock->l_writers) {
+ /* If this is a local lock on a server namespace and this was
+ * the last reference, cancel the lock. */
+ CDEBUG(D_INFO, "forcing cancel of local lock\n");
+ lock->l_flags |= LDLM_FL_CBPENDING;
+ }
+
+ if (!lock->l_readers && !lock->l_writers &&
+ (lock->l_flags & LDLM_FL_CBPENDING)) {
+ /* If we received a blocked AST and this was the last reference,
+ * run the callback. */
+ if ((lock->l_flags & LDLM_FL_NS_SRV) && lock->l_export)
+ CERROR("FL_CBPENDING set on non-local lock--just a warning\n");
+
+ LDLM_DEBUG(lock, "final decref done on cbpending lock");
+
+ LDLM_LOCK_GET(lock); /* dropped by bl thread */
+ ldlm_lock_remove_from_lru(lock);
+ unlock_res_and_lock(lock);
+
+ if (lock->l_flags & LDLM_FL_FAIL_LOC)
+ OBD_RACE(OBD_FAIL_LDLM_CP_BL_RACE);
+
+ if ((lock->l_flags & LDLM_FL_ATOMIC_CB) ||
+ ldlm_bl_to_thread_lock(ns, NULL, lock) != 0)
+ ldlm_handle_bl_callback(ns, NULL, lock);
+ } else if (ns_is_client(ns) &&
+ !lock->l_readers && !lock->l_writers &&
+ !(lock->l_flags & LDLM_FL_NO_LRU) &&
+ !(lock->l_flags & LDLM_FL_BL_AST)) {
+
+ LDLM_DEBUG(lock, "add lock into lru list");
+
+ /* If this is a client-side namespace and this was the last
+ * reference, put it on the LRU. */
+ ldlm_lock_add_to_lru(lock);
+ unlock_res_and_lock(lock);
+
+ if (lock->l_flags & LDLM_FL_FAIL_LOC)
+ OBD_RACE(OBD_FAIL_LDLM_CP_BL_RACE);
+
+ /* Call ldlm_cancel_lru() only if EARLY_CANCEL and LRU RESIZE
+ * are not supported by the server, otherwise, it is done on
+ * enqueue. */
+ if (!exp_connect_cancelset(lock->l_conn_export) &&
+ !ns_connect_lru_resize(ns))
+ ldlm_cancel_lru(ns, 0, LCF_ASYNC, 0);
+ } else {
+ LDLM_DEBUG(lock, "do not add lock into lru list");
+ unlock_res_and_lock(lock);
+ }
+}
+
+/**
+ * Decrease reader/writer refcount for LDLM lock with handle \a lockh
+ */
+void ldlm_lock_decref(struct lustre_handle *lockh, __u32 mode)
+{
+ struct ldlm_lock *lock = __ldlm_handle2lock(lockh, 0);
+
+ LASSERTF(lock != NULL, "Non-existing lock: %#llx\n", lockh->cookie);
+ ldlm_lock_decref_internal(lock, mode);
+ LDLM_LOCK_PUT(lock);
+}
+EXPORT_SYMBOL(ldlm_lock_decref);
+
+/**
+ * Decrease reader/writer refcount for LDLM lock with handle
+ * \a lockh and mark it for subsequent cancellation once r/w refcount
+ * drops to zero instead of putting into LRU.
+ *
+ * Typical usage is for GROUP locks which we cannot allow to be cached.
+ */
+void ldlm_lock_decref_and_cancel(struct lustre_handle *lockh, __u32 mode)
+{
+ struct ldlm_lock *lock = __ldlm_handle2lock(lockh, 0);
+
+ LASSERT(lock != NULL);
+
+ LDLM_DEBUG(lock, "ldlm_lock_decref(%s)", ldlm_lockname[mode]);
+ lock_res_and_lock(lock);
+ lock->l_flags |= LDLM_FL_CBPENDING;
+ unlock_res_and_lock(lock);
+ ldlm_lock_decref_internal(lock, mode);
+ LDLM_LOCK_PUT(lock);
+}
+EXPORT_SYMBOL(ldlm_lock_decref_and_cancel);
+
+struct sl_insert_point {
+ struct list_head *res_link;
+ struct list_head *mode_link;
+ struct list_head *policy_link;
+};
+
+/**
+ * Finds a position to insert the new lock into granted lock list.
+ *
+ * Used for locks eligible for skiplist optimization.
+ *
+ * Parameters:
+ * queue [input]: the granted list where search acts on;
+ * req [input]: the lock whose position to be located;
+ * prev [output]: positions within 3 lists to insert @req to
+ * Return Value:
+ * filled @prev
+ * NOTE: called by
+ * - ldlm_grant_lock_with_skiplist
+ */
+static void search_granted_lock(struct list_head *queue,
+ struct ldlm_lock *req,
+ struct sl_insert_point *prev)
+{
+ struct list_head *tmp;
+ struct ldlm_lock *lock, *mode_end, *policy_end;
+
+ list_for_each(tmp, queue) {
+ lock = list_entry(tmp, struct ldlm_lock, l_res_link);
+
+ mode_end = list_entry(lock->l_sl_mode.prev,
+ struct ldlm_lock, l_sl_mode);
+
+ if (lock->l_req_mode != req->l_req_mode) {
+ /* jump to last lock of mode group */
+ tmp = &mode_end->l_res_link;
+ continue;
+ }
+
+ /* suitable mode group is found */
+ if (lock->l_resource->lr_type == LDLM_PLAIN) {
+ /* insert point is last lock of the mode group */
+ prev->res_link = &mode_end->l_res_link;
+ prev->mode_link = &mode_end->l_sl_mode;
+ prev->policy_link = &req->l_sl_policy;
+ return;
+ } else if (lock->l_resource->lr_type == LDLM_IBITS) {
+ for (;;) {
+ policy_end =
+ list_entry(lock->l_sl_policy.prev,
+ struct ldlm_lock,
+ l_sl_policy);
+
+ if (lock->l_policy_data.l_inodebits.bits ==
+ req->l_policy_data.l_inodebits.bits) {
+ /* insert point is last lock of
+ * the policy group */
+ prev->res_link =
+ &policy_end->l_res_link;
+ prev->mode_link =
+ &policy_end->l_sl_mode;
+ prev->policy_link =
+ &policy_end->l_sl_policy;
+ return;
+ }
+
+ if (policy_end == mode_end)
+ /* done with mode group */
+ break;
+
+ /* go to next policy group within mode group */
+ tmp = policy_end->l_res_link.next;
+ lock = list_entry(tmp, struct ldlm_lock,
+ l_res_link);
+ } /* loop over policy groups within the mode group */
+
+ /* insert point is last lock of the mode group,
+ * new policy group is started */
+ prev->res_link = &mode_end->l_res_link;
+ prev->mode_link = &mode_end->l_sl_mode;
+ prev->policy_link = &req->l_sl_policy;
+ return;
+ } else {
+ LDLM_ERROR(lock,
+ "is not LDLM_PLAIN or LDLM_IBITS lock");
+ LBUG();
+ }
+ }
+
+ /* insert point is last lock on the queue,
+ * new mode group and new policy group are started */
+ prev->res_link = queue->prev;
+ prev->mode_link = &req->l_sl_mode;
+ prev->policy_link = &req->l_sl_policy;
+}
+
+/**
+ * Add a lock into resource granted list after a position described by
+ * \a prev.
+ */
+static void ldlm_granted_list_add_lock(struct ldlm_lock *lock,
+ struct sl_insert_point *prev)
+{
+ struct ldlm_resource *res = lock->l_resource;
+
+ check_res_locked(res);
+
+ ldlm_resource_dump(D_INFO, res);
+ LDLM_DEBUG(lock, "About to add lock:");
+
+ if (lock->l_flags & LDLM_FL_DESTROYED) {
+ CDEBUG(D_OTHER, "Lock destroyed, not adding to resource\n");
+ return;
+ }
+
+ LASSERT(list_empty(&lock->l_res_link));
+ LASSERT(list_empty(&lock->l_sl_mode));
+ LASSERT(list_empty(&lock->l_sl_policy));
+
+ /*
+ * lock->link == prev->link means lock is first starting the group.
+ * Don't re-add to itself to suppress kernel warnings.
+ */
+ if (&lock->l_res_link != prev->res_link)
+ list_add(&lock->l_res_link, prev->res_link);
+ if (&lock->l_sl_mode != prev->mode_link)
+ list_add(&lock->l_sl_mode, prev->mode_link);
+ if (&lock->l_sl_policy != prev->policy_link)
+ list_add(&lock->l_sl_policy, prev->policy_link);
+}
+
+/**
+ * Add a lock to granted list on a resource maintaining skiplist
+ * correctness.
+ */
+static void ldlm_grant_lock_with_skiplist(struct ldlm_lock *lock)
+{
+ struct sl_insert_point prev;
+
+ LASSERT(lock->l_req_mode == lock->l_granted_mode);
+
+ search_granted_lock(&lock->l_resource->lr_granted, lock, &prev);
+ ldlm_granted_list_add_lock(lock, &prev);
+}
+
+/**
+ * Perform lock granting bookkeeping.
+ *
+ * Includes putting the lock into granted list and updating lock mode.
+ * NOTE: called by
+ * - ldlm_lock_enqueue
+ * - ldlm_reprocess_queue
+ * - ldlm_lock_convert
+ *
+ * must be called with lr_lock held
+ */
+void ldlm_grant_lock(struct ldlm_lock *lock, struct list_head *work_list)
+{
+ struct ldlm_resource *res = lock->l_resource;
+
+ check_res_locked(res);
+
+ lock->l_granted_mode = lock->l_req_mode;
+ if (res->lr_type == LDLM_PLAIN || res->lr_type == LDLM_IBITS)
+ ldlm_grant_lock_with_skiplist(lock);
+ else if (res->lr_type == LDLM_EXTENT)
+ ldlm_extent_add_lock(res, lock);
+ else
+ ldlm_resource_add_lock(res, &res->lr_granted, lock);
+
+ if (lock->l_granted_mode < res->lr_most_restr)
+ res->lr_most_restr = lock->l_granted_mode;
+
+ if (work_list && lock->l_completion_ast != NULL)
+ ldlm_add_ast_work_item(lock, NULL, work_list);
+
+ ldlm_pool_add(&ldlm_res_to_ns(res)->ns_pool, lock);
+}
+
+/**
+ * Search for a lock with given properties in a queue.
+ *
+ * \retval a referenced lock or NULL. See the flag descriptions below, in the
+ * comment above ldlm_lock_match
+ */
+static struct ldlm_lock *search_queue(struct list_head *queue,
+ ldlm_mode_t *mode,
+ ldlm_policy_data_t *policy,
+ struct ldlm_lock *old_lock,
+ __u64 flags, int unref)
+{
+ struct ldlm_lock *lock;
+ struct list_head *tmp;
+
+ list_for_each(tmp, queue) {
+ ldlm_mode_t match;
+
+ lock = list_entry(tmp, struct ldlm_lock, l_res_link);
+
+ if (lock == old_lock)
+ break;
+
+ /* Check if this lock can be matched.
+ * Used by LU-2919(exclusive open) for open lease lock */
+ if (ldlm_is_excl(lock))
+ continue;
+
+ /* llite sometimes wants to match locks that will be
+ * canceled when their users drop, but we allow it to match
+ * if it passes in CBPENDING and the lock still has users.
+ * this is generally only going to be used by children
+ * whose parents already hold a lock so forward progress
+ * can still happen. */
+ if (lock->l_flags & LDLM_FL_CBPENDING &&
+ !(flags & LDLM_FL_CBPENDING))
+ continue;
+ if (!unref && lock->l_flags & LDLM_FL_CBPENDING &&
+ lock->l_readers == 0 && lock->l_writers == 0)
+ continue;
+
+ if (!(lock->l_req_mode & *mode))
+ continue;
+ match = lock->l_req_mode;
+
+ if (lock->l_resource->lr_type == LDLM_EXTENT &&
+ (lock->l_policy_data.l_extent.start >
+ policy->l_extent.start ||
+ lock->l_policy_data.l_extent.end < policy->l_extent.end))
+ continue;
+
+ if (unlikely(match == LCK_GROUP) &&
+ lock->l_resource->lr_type == LDLM_EXTENT &&
+ lock->l_policy_data.l_extent.gid != policy->l_extent.gid)
+ continue;
+
+ /* We match if we have existing lock with same or wider set
+ of bits. */
+ if (lock->l_resource->lr_type == LDLM_IBITS &&
+ ((lock->l_policy_data.l_inodebits.bits &
+ policy->l_inodebits.bits) !=
+ policy->l_inodebits.bits))
+ continue;
+
+ if (!unref && (lock->l_flags & LDLM_FL_GONE_MASK))
+ continue;
+
+ if ((flags & LDLM_FL_LOCAL_ONLY) &&
+ !(lock->l_flags & LDLM_FL_LOCAL))
+ continue;
+
+ if (flags & LDLM_FL_TEST_LOCK) {
+ LDLM_LOCK_GET(lock);
+ ldlm_lock_touch_in_lru(lock);
+ } else {
+ ldlm_lock_addref_internal_nolock(lock, match);
+ }
+ *mode = match;
+ return lock;
+ }
+
+ return NULL;
+}
+
+void ldlm_lock_fail_match_locked(struct ldlm_lock *lock)
+{
+ if ((lock->l_flags & LDLM_FL_FAIL_NOTIFIED) == 0) {
+ lock->l_flags |= LDLM_FL_FAIL_NOTIFIED;
+ wake_up_all(&lock->l_waitq);
+ }
+}
+EXPORT_SYMBOL(ldlm_lock_fail_match_locked);
+
+void ldlm_lock_fail_match(struct ldlm_lock *lock)
+{
+ lock_res_and_lock(lock);
+ ldlm_lock_fail_match_locked(lock);
+ unlock_res_and_lock(lock);
+}
+EXPORT_SYMBOL(ldlm_lock_fail_match);
+
+/**
+ * Mark lock as "matchable" by OST.
+ *
+ * Used to prevent certain races in LOV/OSC where the lock is granted, but LVB
+ * is not yet valid.
+ * Assumes LDLM lock is already locked.
+ */
+void ldlm_lock_allow_match_locked(struct ldlm_lock *lock)
+{
+ lock->l_flags |= LDLM_FL_LVB_READY;
+ wake_up_all(&lock->l_waitq);
+}
+EXPORT_SYMBOL(ldlm_lock_allow_match_locked);
+
+/**
+ * Mark lock as "matchable" by OST.
+ * Locks the lock and then \see ldlm_lock_allow_match_locked
+ */
+void ldlm_lock_allow_match(struct ldlm_lock *lock)
+{
+ lock_res_and_lock(lock);
+ ldlm_lock_allow_match_locked(lock);
+ unlock_res_and_lock(lock);
+}
+EXPORT_SYMBOL(ldlm_lock_allow_match);
+
+/**
+ * Attempt to find a lock with specified properties.
+ *
+ * Typically returns a reference to matched lock unless LDLM_FL_TEST_LOCK is
+ * set in \a flags
+ *
+ * Can be called in two ways:
+ *
+ * If 'ns' is NULL, then lockh describes an existing lock that we want to look
+ * for a duplicate of.
+ *
+ * Otherwise, all of the fields must be filled in, to match against.
+ *
+ * If 'flags' contains LDLM_FL_LOCAL_ONLY, then only match local locks on the
+ * server (ie, connh is NULL)
+ * If 'flags' contains LDLM_FL_BLOCK_GRANTED, then only locks on the granted
+ * list will be considered
+ * If 'flags' contains LDLM_FL_CBPENDING, then locks that have been marked
+ * to be canceled can still be matched as long as they still have reader
+ * or writer referneces
+ * If 'flags' contains LDLM_FL_TEST_LOCK, then don't actually reference a lock,
+ * just tell us if we would have matched.
+ *
+ * \retval 1 if it finds an already-existing lock that is compatible; in this
+ * case, lockh is filled in with a addref()ed lock
+ *
+ * We also check security context, and if that fails we simply return 0 (to
+ * keep caller code unchanged), the context failure will be discovered by
+ * caller sometime later.
+ */
+ldlm_mode_t ldlm_lock_match(struct ldlm_namespace *ns, __u64 flags,
+ const struct ldlm_res_id *res_id, ldlm_type_t type,
+ ldlm_policy_data_t *policy, ldlm_mode_t mode,
+ struct lustre_handle *lockh, int unref)
+{
+ struct ldlm_resource *res;
+ struct ldlm_lock *lock, *old_lock = NULL;
+ int rc = 0;
+
+ if (ns == NULL) {
+ old_lock = ldlm_handle2lock(lockh);
+ LASSERT(old_lock);
+
+ ns = ldlm_lock_to_ns(old_lock);
+ res_id = &old_lock->l_resource->lr_name;
+ type = old_lock->l_resource->lr_type;
+ mode = old_lock->l_req_mode;
+ }
+
+ res = ldlm_resource_get(ns, NULL, res_id, type, 0);
+ if (res == NULL) {
+ LASSERT(old_lock == NULL);
+ return 0;
+ }
+
+ LDLM_RESOURCE_ADDREF(res);
+ lock_res(res);
+
+ lock = search_queue(&res->lr_granted, &mode, policy, old_lock,
+ flags, unref);
+ if (lock != NULL) {
+ rc = 1;
+ goto out;
+ }
+ if (flags & LDLM_FL_BLOCK_GRANTED) {
+ rc = 0;
+ goto out;
+ }
+ lock = search_queue(&res->lr_converting, &mode, policy, old_lock,
+ flags, unref);
+ if (lock != NULL) {
+ rc = 1;
+ goto out;
+ }
+ lock = search_queue(&res->lr_waiting, &mode, policy, old_lock,
+ flags, unref);
+ if (lock != NULL) {
+ rc = 1;
+ goto out;
+ }
+
+ out:
+ unlock_res(res);
+ LDLM_RESOURCE_DELREF(res);
+ ldlm_resource_putref(res);
+
+ if (lock) {
+ ldlm_lock2handle(lock, lockh);
+ if ((flags & LDLM_FL_LVB_READY) &&
+ (!(lock->l_flags & LDLM_FL_LVB_READY))) {
+ __u64 wait_flags = LDLM_FL_LVB_READY |
+ LDLM_FL_DESTROYED | LDLM_FL_FAIL_NOTIFIED;
+ struct l_wait_info lwi;
+
+ if (lock->l_completion_ast) {
+ int err = lock->l_completion_ast(lock,
+ LDLM_FL_WAIT_NOREPROC,
+ NULL);
+ if (err) {
+ if (flags & LDLM_FL_TEST_LOCK)
+ LDLM_LOCK_RELEASE(lock);
+ else
+ ldlm_lock_decref_internal(lock,
+ mode);
+ rc = 0;
+ goto out2;
+ }
+ }
+
+ lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(obd_timeout),
+ NULL, LWI_ON_SIGNAL_NOOP, NULL);
+
+ /* XXX FIXME see comment on CAN_MATCH in lustre_dlm.h */
+ l_wait_event(lock->l_waitq,
+ lock->l_flags & wait_flags,
+ &lwi);
+ if (!(lock->l_flags & LDLM_FL_LVB_READY)) {
+ if (flags & LDLM_FL_TEST_LOCK)
+ LDLM_LOCK_RELEASE(lock);
+ else
+ ldlm_lock_decref_internal(lock, mode);
+ rc = 0;
+ }
+ }
+ }
+ out2:
+ if (rc) {
+ LDLM_DEBUG(lock, "matched (%llu %llu)",
+ (type == LDLM_PLAIN || type == LDLM_IBITS) ?
+ res_id->name[2] : policy->l_extent.start,
+ (type == LDLM_PLAIN || type == LDLM_IBITS) ?
+ res_id->name[3] : policy->l_extent.end);
+
+ /* check user's security context */
+ if (lock->l_conn_export &&
+ sptlrpc_import_check_ctx(
+ class_exp2cliimp(lock->l_conn_export))) {
+ if (!(flags & LDLM_FL_TEST_LOCK))
+ ldlm_lock_decref_internal(lock, mode);
+ rc = 0;
+ }
+
+ if (flags & LDLM_FL_TEST_LOCK)
+ LDLM_LOCK_RELEASE(lock);
+
+ } else if (!(flags & LDLM_FL_TEST_LOCK)) {/*less verbose for test-only*/
+ LDLM_DEBUG_NOLOCK("not matched ns %p type %u mode %u res %llu/%llu (%llu %llu)",
+ ns, type, mode, res_id->name[0],
+ res_id->name[1],
+ (type == LDLM_PLAIN || type == LDLM_IBITS) ?
+ res_id->name[2] : policy->l_extent.start,
+ (type == LDLM_PLAIN || type == LDLM_IBITS) ?
+ res_id->name[3] : policy->l_extent.end);
+ }
+ if (old_lock)
+ LDLM_LOCK_PUT(old_lock);
+
+ return rc ? mode : 0;
+}
+EXPORT_SYMBOL(ldlm_lock_match);
+
+ldlm_mode_t ldlm_revalidate_lock_handle(struct lustre_handle *lockh,
+ __u64 *bits)
+{
+ struct ldlm_lock *lock;
+ ldlm_mode_t mode = 0;
+
+ lock = ldlm_handle2lock(lockh);
+ if (lock != NULL) {
+ lock_res_and_lock(lock);
+ if (lock->l_flags & LDLM_FL_GONE_MASK)
+ goto out;
+
+ if (lock->l_flags & LDLM_FL_CBPENDING &&
+ lock->l_readers == 0 && lock->l_writers == 0)
+ goto out;
+
+ if (bits)
+ *bits = lock->l_policy_data.l_inodebits.bits;
+ mode = lock->l_granted_mode;
+ ldlm_lock_addref_internal_nolock(lock, mode);
+ }
+
+out:
+ if (lock != NULL) {
+ unlock_res_and_lock(lock);
+ LDLM_LOCK_PUT(lock);
+ }
+ return mode;
+}
+EXPORT_SYMBOL(ldlm_revalidate_lock_handle);
+
+/** The caller must guarantee that the buffer is large enough. */
+int ldlm_fill_lvb(struct ldlm_lock *lock, struct req_capsule *pill,
+ enum req_location loc, void *data, int size)
+{
+ void *lvb;
+
+ LASSERT(data != NULL);
+ LASSERT(size >= 0);
+
+ switch (lock->l_lvb_type) {
+ case LVB_T_OST:
+ if (size == sizeof(struct ost_lvb)) {
+ if (loc == RCL_CLIENT)
+ lvb = req_capsule_client_swab_get(pill,
+ &RMF_DLM_LVB,
+ lustre_swab_ost_lvb);
+ else
+ lvb = req_capsule_server_swab_get(pill,
+ &RMF_DLM_LVB,
+ lustre_swab_ost_lvb);
+ if (unlikely(lvb == NULL)) {
+ LDLM_ERROR(lock, "no LVB");
+ return -EPROTO;
+ }
+
+ memcpy(data, lvb, size);
+ } else if (size == sizeof(struct ost_lvb_v1)) {
+ struct ost_lvb *olvb = data;
+
+ if (loc == RCL_CLIENT)
+ lvb = req_capsule_client_swab_get(pill,
+ &RMF_DLM_LVB,
+ lustre_swab_ost_lvb_v1);
+ else
+ lvb = req_capsule_server_sized_swab_get(pill,
+ &RMF_DLM_LVB, size,
+ lustre_swab_ost_lvb_v1);
+ if (unlikely(lvb == NULL)) {
+ LDLM_ERROR(lock, "no LVB");
+ return -EPROTO;
+ }
+
+ memcpy(data, lvb, size);
+ olvb->lvb_mtime_ns = 0;
+ olvb->lvb_atime_ns = 0;
+ olvb->lvb_ctime_ns = 0;
+ } else {
+ LDLM_ERROR(lock, "Replied unexpected ost LVB size %d",
+ size);
+ return -EINVAL;
+ }
+ break;
+ case LVB_T_LQUOTA:
+ if (size == sizeof(struct lquota_lvb)) {
+ if (loc == RCL_CLIENT)
+ lvb = req_capsule_client_swab_get(pill,
+ &RMF_DLM_LVB,
+ lustre_swab_lquota_lvb);
+ else
+ lvb = req_capsule_server_swab_get(pill,
+ &RMF_DLM_LVB,
+ lustre_swab_lquota_lvb);
+ if (unlikely(lvb == NULL)) {
+ LDLM_ERROR(lock, "no LVB");
+ return -EPROTO;
+ }
+
+ memcpy(data, lvb, size);
+ } else {
+ LDLM_ERROR(lock,
+ "Replied unexpected lquota LVB size %d",
+ size);
+ return -EINVAL;
+ }
+ break;
+ case LVB_T_LAYOUT:
+ if (size == 0)
+ break;
+
+ if (loc == RCL_CLIENT)
+ lvb = req_capsule_client_get(pill, &RMF_DLM_LVB);
+ else
+ lvb = req_capsule_server_get(pill, &RMF_DLM_LVB);
+ if (unlikely(lvb == NULL)) {
+ LDLM_ERROR(lock, "no LVB");
+ return -EPROTO;
+ }
+
+ memcpy(data, lvb, size);
+ break;
+ default:
+ LDLM_ERROR(lock, "Unknown LVB type: %d\n", lock->l_lvb_type);
+ dump_stack();
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/**
+ * Create and fill in new LDLM lock with specified properties.
+ * Returns a referenced lock
+ */
+struct ldlm_lock *ldlm_lock_create(struct ldlm_namespace *ns,
+ const struct ldlm_res_id *res_id,
+ ldlm_type_t type,
+ ldlm_mode_t mode,
+ const struct ldlm_callback_suite *cbs,
+ void *data, __u32 lvb_len,
+ enum lvb_type lvb_type)
+{
+ struct ldlm_lock *lock;
+ struct ldlm_resource *res;
+
+ res = ldlm_resource_get(ns, NULL, res_id, type, 1);
+ if (res == NULL)
+ return NULL;
+
+ lock = ldlm_lock_new(res);
+
+ if (lock == NULL)
+ return NULL;
+
+ lock->l_req_mode = mode;
+ lock->l_ast_data = data;
+ lock->l_pid = current_pid();
+ if (ns_is_server(ns))
+ lock->l_flags |= LDLM_FL_NS_SRV;
+ if (cbs) {
+ lock->l_blocking_ast = cbs->lcs_blocking;
+ lock->l_completion_ast = cbs->lcs_completion;
+ lock->l_glimpse_ast = cbs->lcs_glimpse;
+ }
+
+ lock->l_tree_node = NULL;
+ /* if this is the extent lock, allocate the interval tree node */
+ if (type == LDLM_EXTENT) {
+ if (ldlm_interval_alloc(lock) == NULL)
+ goto out;
+ }
+
+ if (lvb_len) {
+ lock->l_lvb_len = lvb_len;
+ OBD_ALLOC(lock->l_lvb_data, lvb_len);
+ if (lock->l_lvb_data == NULL)
+ goto out;
+ }
+
+ lock->l_lvb_type = lvb_type;
+ if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_NEW_LOCK))
+ goto out;
+
+ return lock;
+
+out:
+ ldlm_lock_destroy(lock);
+ LDLM_LOCK_RELEASE(lock);
+ return NULL;
+}
+
+/**
+ * Enqueue (request) a lock.
+ *
+ * Does not block. As a result of enqueue the lock would be put
+ * into granted or waiting list.
+ *
+ * If namespace has intent policy sent and the lock has LDLM_FL_HAS_INTENT flag
+ * set, skip all the enqueueing and delegate lock processing to intent policy
+ * function.
+ */
+ldlm_error_t ldlm_lock_enqueue(struct ldlm_namespace *ns,
+ struct ldlm_lock **lockp,
+ void *cookie, __u64 *flags)
+{
+ struct ldlm_lock *lock = *lockp;
+ struct ldlm_resource *res = lock->l_resource;
+ int local = ns_is_client(ldlm_res_to_ns(res));
+ ldlm_error_t rc = ELDLM_OK;
+ struct ldlm_interval *node = NULL;
+
+ lock->l_last_activity = get_seconds();
+ /* policies are not executed on the client or during replay */
+ if ((*flags & (LDLM_FL_HAS_INTENT|LDLM_FL_REPLAY)) == LDLM_FL_HAS_INTENT
+ && !local && ns->ns_policy) {
+ rc = ns->ns_policy(ns, lockp, cookie, lock->l_req_mode, *flags,
+ NULL);
+ if (rc == ELDLM_LOCK_REPLACED) {
+ /* The lock that was returned has already been granted,
+ * and placed into lockp. If it's not the same as the
+ * one we passed in, then destroy the old one and our
+ * work here is done. */
+ if (lock != *lockp) {
+ ldlm_lock_destroy(lock);
+ LDLM_LOCK_RELEASE(lock);
+ }
+ *flags |= LDLM_FL_LOCK_CHANGED;
+ return 0;
+ } else if (rc != ELDLM_OK ||
+ (rc == ELDLM_OK && (*flags & LDLM_FL_INTENT_ONLY))) {
+ ldlm_lock_destroy(lock);
+ return rc;
+ }
+ }
+
+ /* For a replaying lock, it might be already in granted list. So
+ * unlinking the lock will cause the interval node to be freed, we
+ * have to allocate the interval node early otherwise we can't regrant
+ * this lock in the future. - jay */
+ if (!local && (*flags & LDLM_FL_REPLAY) && res->lr_type == LDLM_EXTENT)
+ OBD_SLAB_ALLOC_PTR_GFP(node, ldlm_interval_slab, GFP_NOFS);
+
+ lock_res_and_lock(lock);
+ if (local && lock->l_req_mode == lock->l_granted_mode) {
+ /* The server returned a blocked lock, but it was granted
+ * before we got a chance to actually enqueue it. We don't
+ * need to do anything else. */
+ *flags &= ~(LDLM_FL_BLOCK_GRANTED |
+ LDLM_FL_BLOCK_CONV | LDLM_FL_BLOCK_WAIT);
+ goto out;
+ }
+
+ ldlm_resource_unlink_lock(lock);
+ if (res->lr_type == LDLM_EXTENT && lock->l_tree_node == NULL) {
+ if (node == NULL) {
+ ldlm_lock_destroy_nolock(lock);
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ INIT_LIST_HEAD(&node->li_group);
+ ldlm_interval_attach(node, lock);
+ node = NULL;
+ }
+
+ /* Some flags from the enqueue want to make it into the AST, via the
+ * lock's l_flags. */
+ lock->l_flags |= *flags & LDLM_FL_AST_DISCARD_DATA;
+
+ /* This distinction between local lock trees is very important; a client
+ * namespace only has information about locks taken by that client, and
+ * thus doesn't have enough information to decide for itself if it can
+ * be granted (below). In this case, we do exactly what the server
+ * tells us to do, as dictated by the 'flags'.
+ *
+ * We do exactly the same thing during recovery, when the server is
+ * more or less trusting the clients not to lie.
+ *
+ * FIXME (bug 268): Detect obvious lies by checking compatibility in
+ * granted/converting queues. */
+ if (local) {
+ if (*flags & LDLM_FL_BLOCK_CONV)
+ ldlm_resource_add_lock(res, &res->lr_converting, lock);
+ else if (*flags & (LDLM_FL_BLOCK_WAIT | LDLM_FL_BLOCK_GRANTED))
+ ldlm_resource_add_lock(res, &res->lr_waiting, lock);
+ else
+ ldlm_grant_lock(lock, NULL);
+ goto out;
+ } else {
+ CERROR("This is client-side-only module, cannot handle LDLM_NAMESPACE_SERVER resource type lock.\n");
+ LBUG();
+ }
+
+out:
+ unlock_res_and_lock(lock);
+ if (node)
+ OBD_SLAB_FREE(node, ldlm_interval_slab, sizeof(*node));
+ return rc;
+}
+
+
+/**
+ * Process a call to blocking AST callback for a lock in ast_work list
+ */
+static int
+ldlm_work_bl_ast_lock(struct ptlrpc_request_set *rqset, void *opaq)
+{
+ struct ldlm_cb_set_arg *arg = opaq;
+ struct ldlm_lock_desc d;
+ int rc;
+ struct ldlm_lock *lock;
+
+ if (list_empty(arg->list))
+ return -ENOENT;
+
+ lock = list_entry(arg->list->next, struct ldlm_lock, l_bl_ast);
+
+ /* nobody should touch l_bl_ast */
+ lock_res_and_lock(lock);
+ list_del_init(&lock->l_bl_ast);
+
+ LASSERT(lock->l_flags & LDLM_FL_AST_SENT);
+ LASSERT(lock->l_bl_ast_run == 0);
+ LASSERT(lock->l_blocking_lock);
+ lock->l_bl_ast_run++;
+ unlock_res_and_lock(lock);
+
+ ldlm_lock2desc(lock->l_blocking_lock, &d);
+
+ rc = lock->l_blocking_ast(lock, &d, (void *)arg, LDLM_CB_BLOCKING);
+ LDLM_LOCK_RELEASE(lock->l_blocking_lock);
+ lock->l_blocking_lock = NULL;
+ LDLM_LOCK_RELEASE(lock);
+
+ return rc;
+}
+
+/**
+ * Process a call to completion AST callback for a lock in ast_work list
+ */
+static int
+ldlm_work_cp_ast_lock(struct ptlrpc_request_set *rqset, void *opaq)
+{
+ struct ldlm_cb_set_arg *arg = opaq;
+ int rc = 0;
+ struct ldlm_lock *lock;
+ ldlm_completion_callback completion_callback;
+
+ if (list_empty(arg->list))
+ return -ENOENT;
+
+ lock = list_entry(arg->list->next, struct ldlm_lock, l_cp_ast);
+
+ /* It's possible to receive a completion AST before we've set
+ * the l_completion_ast pointer: either because the AST arrived
+ * before the reply, or simply because there's a small race
+ * window between receiving the reply and finishing the local
+ * enqueue. (bug 842)
+ *
+ * This can't happen with the blocking_ast, however, because we
+ * will never call the local blocking_ast until we drop our
+ * reader/writer reference, which we won't do until we get the
+ * reply and finish enqueueing. */
+
+ /* nobody should touch l_cp_ast */
+ lock_res_and_lock(lock);
+ list_del_init(&lock->l_cp_ast);
+ LASSERT(lock->l_flags & LDLM_FL_CP_REQD);
+ /* save l_completion_ast since it can be changed by
+ * mds_intent_policy(), see bug 14225 */
+ completion_callback = lock->l_completion_ast;
+ lock->l_flags &= ~LDLM_FL_CP_REQD;
+ unlock_res_and_lock(lock);
+
+ if (completion_callback != NULL)
+ rc = completion_callback(lock, 0, (void *)arg);
+ LDLM_LOCK_RELEASE(lock);
+
+ return rc;
+}
+
+/**
+ * Process a call to revocation AST callback for a lock in ast_work list
+ */
+static int
+ldlm_work_revoke_ast_lock(struct ptlrpc_request_set *rqset, void *opaq)
+{
+ struct ldlm_cb_set_arg *arg = opaq;
+ struct ldlm_lock_desc desc;
+ int rc;
+ struct ldlm_lock *lock;
+
+ if (list_empty(arg->list))
+ return -ENOENT;
+
+ lock = list_entry(arg->list->next, struct ldlm_lock, l_rk_ast);
+ list_del_init(&lock->l_rk_ast);
+
+ /* the desc just pretend to exclusive */
+ ldlm_lock2desc(lock, &desc);
+ desc.l_req_mode = LCK_EX;
+ desc.l_granted_mode = 0;
+
+ rc = lock->l_blocking_ast(lock, &desc, (void *)arg, LDLM_CB_BLOCKING);
+ LDLM_LOCK_RELEASE(lock);
+
+ return rc;
+}
+
+/**
+ * Process a call to glimpse AST callback for a lock in ast_work list
+ */
+int ldlm_work_gl_ast_lock(struct ptlrpc_request_set *rqset, void *opaq)
+{
+ struct ldlm_cb_set_arg *arg = opaq;
+ struct ldlm_glimpse_work *gl_work;
+ struct ldlm_lock *lock;
+ int rc = 0;
+
+ if (list_empty(arg->list))
+ return -ENOENT;
+
+ gl_work = list_entry(arg->list->next, struct ldlm_glimpse_work,
+ gl_list);
+ list_del_init(&gl_work->gl_list);
+
+ lock = gl_work->gl_lock;
+
+ /* transfer the glimpse descriptor to ldlm_cb_set_arg */
+ arg->gl_desc = gl_work->gl_desc;
+
+ /* invoke the actual glimpse callback */
+ if (lock->l_glimpse_ast(lock, (void *)arg) == 0)
+ rc = 1;
+
+ LDLM_LOCK_RELEASE(lock);
+
+ if ((gl_work->gl_flags & LDLM_GL_WORK_NOFREE) == 0)
+ OBD_FREE_PTR(gl_work);
+
+ return rc;
+}
+
+/**
+ * Process list of locks in need of ASTs being sent.
+ *
+ * Used on server to send multiple ASTs together instead of sending one by
+ * one.
+ */
+int ldlm_run_ast_work(struct ldlm_namespace *ns, struct list_head *rpc_list,
+ enum ldlm_desc_ast_t ast_type)
+{
+ struct ldlm_cb_set_arg *arg;
+ set_producer_func work_ast_lock;
+ int rc;
+
+ if (list_empty(rpc_list))
+ return 0;
+
+ OBD_ALLOC_PTR(arg);
+ if (arg == NULL)
+ return -ENOMEM;
+
+ atomic_set(&arg->restart, 0);
+ arg->list = rpc_list;
+
+ switch (ast_type) {
+ case LDLM_WORK_BL_AST:
+ arg->type = LDLM_BL_CALLBACK;
+ work_ast_lock = ldlm_work_bl_ast_lock;
+ break;
+ case LDLM_WORK_CP_AST:
+ arg->type = LDLM_CP_CALLBACK;
+ work_ast_lock = ldlm_work_cp_ast_lock;
+ break;
+ case LDLM_WORK_REVOKE_AST:
+ arg->type = LDLM_BL_CALLBACK;
+ work_ast_lock = ldlm_work_revoke_ast_lock;
+ break;
+ case LDLM_WORK_GL_AST:
+ arg->type = LDLM_GL_CALLBACK;
+ work_ast_lock = ldlm_work_gl_ast_lock;
+ break;
+ default:
+ LBUG();
+ }
+
+ /* We create a ptlrpc request set with flow control extension.
+ * This request set will use the work_ast_lock function to produce new
+ * requests and will send a new request each time one completes in order
+ * to keep the number of requests in flight to ns_max_parallel_ast */
+ arg->set = ptlrpc_prep_fcset(ns->ns_max_parallel_ast ? : UINT_MAX,
+ work_ast_lock, arg);
+ if (arg->set == NULL) {
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ ptlrpc_set_wait(arg->set);
+ ptlrpc_set_destroy(arg->set);
+
+ rc = atomic_read(&arg->restart) ? -ERESTART : 0;
+ goto out;
+out:
+ OBD_FREE_PTR(arg);
+ return rc;
+}
+
+static int reprocess_one_queue(struct ldlm_resource *res, void *closure)
+{
+ ldlm_reprocess_all(res);
+ return LDLM_ITER_CONTINUE;
+}
+
+static int ldlm_reprocess_res(struct cfs_hash *hs, struct cfs_hash_bd *bd,
+ struct hlist_node *hnode, void *arg)
+{
+ struct ldlm_resource *res = cfs_hash_object(hs, hnode);
+ int rc;
+
+ rc = reprocess_one_queue(res, arg);
+
+ return rc == LDLM_ITER_STOP;
+}
+
+/**
+ * Iterate through all resources on a namespace attempting to grant waiting
+ * locks.
+ */
+void ldlm_reprocess_all_ns(struct ldlm_namespace *ns)
+{
+ if (ns != NULL) {
+ cfs_hash_for_each_nolock(ns->ns_rs_hash,
+ ldlm_reprocess_res, NULL);
+ }
+}
+EXPORT_SYMBOL(ldlm_reprocess_all_ns);
+
+/**
+ * Try to grant all waiting locks on a resource.
+ *
+ * Calls ldlm_reprocess_queue on converting and waiting queues.
+ *
+ * Typically called after some resource locks are cancelled to see
+ * if anything could be granted as a result of the cancellation.
+ */
+void ldlm_reprocess_all(struct ldlm_resource *res)
+{
+ LIST_HEAD(rpc_list);
+
+ if (!ns_is_client(ldlm_res_to_ns(res))) {
+ CERROR("This is client-side-only module, cannot handle LDLM_NAMESPACE_SERVER resource type lock.\n");
+ LBUG();
+ }
+}
+
+/**
+ * Helper function to call blocking AST for LDLM lock \a lock in a
+ * "cancelling" mode.
+ */
+void ldlm_cancel_callback(struct ldlm_lock *lock)
+{
+ check_res_locked(lock->l_resource);
+ if (!(lock->l_flags & LDLM_FL_CANCEL)) {
+ lock->l_flags |= LDLM_FL_CANCEL;
+ if (lock->l_blocking_ast) {
+ unlock_res_and_lock(lock);
+ lock->l_blocking_ast(lock, NULL, lock->l_ast_data,
+ LDLM_CB_CANCELING);
+ lock_res_and_lock(lock);
+ } else {
+ LDLM_DEBUG(lock, "no blocking ast");
+ }
+ }
+ lock->l_flags |= LDLM_FL_BL_DONE;
+}
+
+/**
+ * Remove skiplist-enabled LDLM lock \a req from granted list
+ */
+void ldlm_unlink_lock_skiplist(struct ldlm_lock *req)
+{
+ if (req->l_resource->lr_type != LDLM_PLAIN &&
+ req->l_resource->lr_type != LDLM_IBITS)
+ return;
+
+ list_del_init(&req->l_sl_policy);
+ list_del_init(&req->l_sl_mode);
+}
+
+/**
+ * Attempts to cancel LDLM lock \a lock that has no reader/writer references.
+ */
+void ldlm_lock_cancel(struct ldlm_lock *lock)
+{
+ struct ldlm_resource *res;
+ struct ldlm_namespace *ns;
+
+ lock_res_and_lock(lock);
+
+ res = lock->l_resource;
+ ns = ldlm_res_to_ns(res);
+
+ /* Please do not, no matter how tempting, remove this LBUG without
+ * talking to me first. -phik */
+ if (lock->l_readers || lock->l_writers) {
+ LDLM_ERROR(lock, "lock still has references");
+ LBUG();
+ }
+
+ if (lock->l_flags & LDLM_FL_WAITED)
+ ldlm_del_waiting_lock(lock);
+
+ /* Releases cancel callback. */
+ ldlm_cancel_callback(lock);
+
+ /* Yes, second time, just in case it was added again while we were
+ * running with no res lock in ldlm_cancel_callback */
+ if (lock->l_flags & LDLM_FL_WAITED)
+ ldlm_del_waiting_lock(lock);
+
+ ldlm_resource_unlink_lock(lock);
+ ldlm_lock_destroy_nolock(lock);
+
+ if (lock->l_granted_mode == lock->l_req_mode)
+ ldlm_pool_del(&ns->ns_pool, lock);
+
+ /* Make sure we will not be called again for same lock what is possible
+ * if not to zero out lock->l_granted_mode */
+ lock->l_granted_mode = LCK_MINMODE;
+ unlock_res_and_lock(lock);
+}
+EXPORT_SYMBOL(ldlm_lock_cancel);
+
+/**
+ * Set opaque data into the lock that only makes sense to upper layer.
+ */
+int ldlm_lock_set_data(struct lustre_handle *lockh, void *data)
+{
+ struct ldlm_lock *lock = ldlm_handle2lock(lockh);
+ int rc = -EINVAL;
+
+ if (lock) {
+ if (lock->l_ast_data == NULL)
+ lock->l_ast_data = data;
+ if (lock->l_ast_data == data)
+ rc = 0;
+ LDLM_LOCK_PUT(lock);
+ }
+ return rc;
+}
+EXPORT_SYMBOL(ldlm_lock_set_data);
+
+struct export_cl_data {
+ struct obd_export *ecl_exp;
+ int ecl_loop;
+};
+
+/**
+ * Iterator function for ldlm_cancel_locks_for_export.
+ * Cancels passed locks.
+ */
+int ldlm_cancel_locks_for_export_cb(struct cfs_hash *hs, struct cfs_hash_bd *bd,
+ struct hlist_node *hnode, void *data)
+
+{
+ struct export_cl_data *ecl = (struct export_cl_data *)data;
+ struct obd_export *exp = ecl->ecl_exp;
+ struct ldlm_lock *lock = cfs_hash_object(hs, hnode);
+ struct ldlm_resource *res;
+
+ res = ldlm_resource_getref(lock->l_resource);
+ LDLM_LOCK_GET(lock);
+
+ LDLM_DEBUG(lock, "export %p", exp);
+ ldlm_res_lvbo_update(res, NULL, 1);
+ ldlm_lock_cancel(lock);
+ ldlm_reprocess_all(res);
+ ldlm_resource_putref(res);
+ LDLM_LOCK_RELEASE(lock);
+
+ ecl->ecl_loop++;
+ if ((ecl->ecl_loop & -ecl->ecl_loop) == ecl->ecl_loop) {
+ CDEBUG(D_INFO,
+ "Cancel lock %p for export %p (loop %d), still have %d locks left on hash table.\n",
+ lock, exp, ecl->ecl_loop,
+ atomic_read(&hs->hs_count));
+ }
+
+ return 0;
+}
+
+/**
+ * Cancel all locks for given export.
+ *
+ * Typically called on client disconnection/eviction
+ */
+void ldlm_cancel_locks_for_export(struct obd_export *exp)
+{
+ struct export_cl_data ecl = {
+ .ecl_exp = exp,
+ .ecl_loop = 0,
+ };
+
+ cfs_hash_for_each_empty(exp->exp_lock_hash,
+ ldlm_cancel_locks_for_export_cb, &ecl);
+}
+
+/**
+ * Downgrade an exclusive lock.
+ *
+ * A fast variant of ldlm_lock_convert for conversion of exclusive
+ * locks. The conversion is always successful.
+ * Used by Commit on Sharing (COS) code.
+ *
+ * \param lock A lock to convert
+ * \param new_mode new lock mode
+ */
+void ldlm_lock_downgrade(struct ldlm_lock *lock, int new_mode)
+{
+ LASSERT(lock->l_granted_mode & (LCK_PW | LCK_EX));
+ LASSERT(new_mode == LCK_COS);
+
+ lock_res_and_lock(lock);
+ ldlm_resource_unlink_lock(lock);
+ /*
+ * Remove the lock from pool as it will be added again in
+ * ldlm_grant_lock() called below.
+ */
+ ldlm_pool_del(&ldlm_lock_to_ns(lock)->ns_pool, lock);
+
+ lock->l_req_mode = new_mode;
+ ldlm_grant_lock(lock, NULL);
+ unlock_res_and_lock(lock);
+ ldlm_reprocess_all(lock->l_resource);
+}
+EXPORT_SYMBOL(ldlm_lock_downgrade);
+
+/**
+ * Attempt to convert already granted lock to a different mode.
+ *
+ * While lock conversion is not currently used, future client-side
+ * optimizations could take advantage of it to avoid discarding cached
+ * pages on a file.
+ */
+struct ldlm_resource *ldlm_lock_convert(struct ldlm_lock *lock, int new_mode,
+ __u32 *flags)
+{
+ LIST_HEAD(rpc_list);
+ struct ldlm_resource *res;
+ struct ldlm_namespace *ns;
+ int granted = 0;
+ struct ldlm_interval *node;
+
+ /* Just return if mode is unchanged. */
+ if (new_mode == lock->l_granted_mode) {
+ *flags |= LDLM_FL_BLOCK_GRANTED;
+ return lock->l_resource;
+ }
+
+ /* I can't check the type of lock here because the bitlock of lock
+ * is not held here, so do the allocation blindly. -jay */
+ OBD_SLAB_ALLOC_PTR_GFP(node, ldlm_interval_slab, GFP_NOFS);
+ if (node == NULL)
+ /* Actually, this causes EDEADLOCK to be returned */
+ return NULL;
+
+ LASSERTF((new_mode == LCK_PW && lock->l_granted_mode == LCK_PR),
+ "new_mode %u, granted %u\n", new_mode, lock->l_granted_mode);
+
+ lock_res_and_lock(lock);
+
+ res = lock->l_resource;
+ ns = ldlm_res_to_ns(res);
+
+ lock->l_req_mode = new_mode;
+ if (res->lr_type == LDLM_PLAIN || res->lr_type == LDLM_IBITS) {
+ ldlm_resource_unlink_lock(lock);
+ } else {
+ ldlm_resource_unlink_lock(lock);
+ if (res->lr_type == LDLM_EXTENT) {
+ /* FIXME: ugly code, I have to attach the lock to a
+ * interval node again since perhaps it will be granted
+ * soon */
+ INIT_LIST_HEAD(&node->li_group);
+ ldlm_interval_attach(node, lock);
+ node = NULL;
+ }
+ }
+
+ /*
+ * Remove old lock from the pool before adding the lock with new
+ * mode below in ->policy()
+ */
+ ldlm_pool_del(&ns->ns_pool, lock);
+
+ /* If this is a local resource, put it on the appropriate list. */
+ if (ns_is_client(ldlm_res_to_ns(res))) {
+ if (*flags & (LDLM_FL_BLOCK_CONV | LDLM_FL_BLOCK_GRANTED)) {
+ ldlm_resource_add_lock(res, &res->lr_converting, lock);
+ } else {
+ /* This should never happen, because of the way the
+ * server handles conversions. */
+ LDLM_ERROR(lock, "Erroneous flags %x on local lock\n",
+ *flags);
+ LBUG();
+
+ ldlm_grant_lock(lock, &rpc_list);
+ granted = 1;
+ /* FIXME: completion handling not with lr_lock held ! */
+ if (lock->l_completion_ast)
+ lock->l_completion_ast(lock, 0, NULL);
+ }
+ } else {
+ CERROR("This is client-side-only module, cannot handle LDLM_NAMESPACE_SERVER resource type lock.\n");
+ LBUG();
+ }
+ unlock_res_and_lock(lock);
+
+ if (granted)
+ ldlm_run_ast_work(ns, &rpc_list, LDLM_WORK_CP_AST);
+ if (node)
+ OBD_SLAB_FREE(node, ldlm_interval_slab, sizeof(*node));
+ return res;
+}
+EXPORT_SYMBOL(ldlm_lock_convert);
+
+/**
+ * Print lock with lock handle \a lockh description into debug log.
+ *
+ * Used when printing all locks on a resource for debug purposes.
+ */
+void ldlm_lock_dump_handle(int level, struct lustre_handle *lockh)
+{
+ struct ldlm_lock *lock;
+
+ if (!((libcfs_debug | D_ERROR) & level))
+ return;
+
+ lock = ldlm_handle2lock(lockh);
+ if (lock == NULL)
+ return;
+
+ LDLM_DEBUG_LIMIT(level, lock, "###");
+
+ LDLM_LOCK_PUT(lock);
+}
+EXPORT_SYMBOL(ldlm_lock_dump_handle);
+
+/**
+ * Print lock information with custom message into debug log.
+ * Helper function.
+ */
+void _ldlm_lock_debug(struct ldlm_lock *lock,
+ struct libcfs_debug_msg_data *msgdata,
+ const char *fmt, ...)
+{
+ va_list args;
+ struct obd_export *exp = lock->l_export;
+ struct ldlm_resource *resource = lock->l_resource;
+ char *nid = "local";
+
+ va_start(args, fmt);
+
+ if (exp && exp->exp_connection) {
+ nid = libcfs_nid2str(exp->exp_connection->c_peer.nid);
+ } else if (exp && exp->exp_obd != NULL) {
+ struct obd_import *imp = exp->exp_obd->u.cli.cl_import;
+
+ nid = libcfs_nid2str(imp->imp_connection->c_peer.nid);
+ }
+
+ if (resource == NULL) {
+ libcfs_debug_vmsg2(msgdata, fmt, args,
+ " ns: \?\? lock: %p/%#llx lrc: %d/%d,%d mode: %s/%s res: \?\? rrc=\?\? type: \?\?\? flags: %#llx nid: %s remote: %#llx expref: %d pid: %u timeout: %lu lvb_type: %d\n",
+ lock,
+ lock->l_handle.h_cookie, atomic_read(&lock->l_refc),
+ lock->l_readers, lock->l_writers,
+ ldlm_lockname[lock->l_granted_mode],
+ ldlm_lockname[lock->l_req_mode],
+ lock->l_flags, nid, lock->l_remote_handle.cookie,
+ exp ? atomic_read(&exp->exp_refcount) : -99,
+ lock->l_pid, lock->l_callback_timeout, lock->l_lvb_type);
+ va_end(args);
+ return;
+ }
+
+ switch (resource->lr_type) {
+ case LDLM_EXTENT:
+ libcfs_debug_vmsg2(msgdata, fmt, args,
+ " ns: %s lock: %p/%#llx lrc: %d/%d,%d mode: %s/%s res: " DLDLMRES " rrc: %d type: %s [%llu->%llu] (req %llu->%llu) flags: %#llx nid: %s remote: %#llx expref: %d pid: %u timeout: %lu lvb_type: %d\n",
+ ldlm_lock_to_ns_name(lock), lock,
+ lock->l_handle.h_cookie, atomic_read(&lock->l_refc),
+ lock->l_readers, lock->l_writers,
+ ldlm_lockname[lock->l_granted_mode],
+ ldlm_lockname[lock->l_req_mode],
+ PLDLMRES(resource),
+ atomic_read(&resource->lr_refcount),
+ ldlm_typename[resource->lr_type],
+ lock->l_policy_data.l_extent.start,
+ lock->l_policy_data.l_extent.end,
+ lock->l_req_extent.start, lock->l_req_extent.end,
+ lock->l_flags, nid, lock->l_remote_handle.cookie,
+ exp ? atomic_read(&exp->exp_refcount) : -99,
+ lock->l_pid, lock->l_callback_timeout,
+ lock->l_lvb_type);
+ break;
+
+ case LDLM_FLOCK:
+ libcfs_debug_vmsg2(msgdata, fmt, args,
+ " ns: %s lock: %p/%#llx lrc: %d/%d,%d mode: %s/%s res: " DLDLMRES " rrc: %d type: %s pid: %d [%llu->%llu] flags: %#llx nid: %s remote: %#llx expref: %d pid: %u timeout: %lu\n",
+ ldlm_lock_to_ns_name(lock), lock,
+ lock->l_handle.h_cookie, atomic_read(&lock->l_refc),
+ lock->l_readers, lock->l_writers,
+ ldlm_lockname[lock->l_granted_mode],
+ ldlm_lockname[lock->l_req_mode],
+ PLDLMRES(resource),
+ atomic_read(&resource->lr_refcount),
+ ldlm_typename[resource->lr_type],
+ lock->l_policy_data.l_flock.pid,
+ lock->l_policy_data.l_flock.start,
+ lock->l_policy_data.l_flock.end,
+ lock->l_flags, nid, lock->l_remote_handle.cookie,
+ exp ? atomic_read(&exp->exp_refcount) : -99,
+ lock->l_pid, lock->l_callback_timeout);
+ break;
+
+ case LDLM_IBITS:
+ libcfs_debug_vmsg2(msgdata, fmt, args,
+ " ns: %s lock: %p/%#llx lrc: %d/%d,%d mode: %s/%s res: " DLDLMRES " bits %#llx rrc: %d type: %s flags: %#llx nid: %s remote: %#llx expref: %d pid: %u timeout: %lu lvb_type: %d\n",
+ ldlm_lock_to_ns_name(lock),
+ lock, lock->l_handle.h_cookie,
+ atomic_read(&lock->l_refc),
+ lock->l_readers, lock->l_writers,
+ ldlm_lockname[lock->l_granted_mode],
+ ldlm_lockname[lock->l_req_mode],
+ PLDLMRES(resource),
+ lock->l_policy_data.l_inodebits.bits,
+ atomic_read(&resource->lr_refcount),
+ ldlm_typename[resource->lr_type],
+ lock->l_flags, nid, lock->l_remote_handle.cookie,
+ exp ? atomic_read(&exp->exp_refcount) : -99,
+ lock->l_pid, lock->l_callback_timeout,
+ lock->l_lvb_type);
+ break;
+
+ default:
+ libcfs_debug_vmsg2(msgdata, fmt, args,
+ " ns: %s lock: %p/%#llx lrc: %d/%d,%d mode: %s/%s res: " DLDLMRES " rrc: %d type: %s flags: %#llx nid: %s remote: %#llx expref: %d pid: %u timeout: %lu lvb_type: %d\n",
+ ldlm_lock_to_ns_name(lock),
+ lock, lock->l_handle.h_cookie,
+ atomic_read(&lock->l_refc),
+ lock->l_readers, lock->l_writers,
+ ldlm_lockname[lock->l_granted_mode],
+ ldlm_lockname[lock->l_req_mode],
+ PLDLMRES(resource),
+ atomic_read(&resource->lr_refcount),
+ ldlm_typename[resource->lr_type],
+ lock->l_flags, nid, lock->l_remote_handle.cookie,
+ exp ? atomic_read(&exp->exp_refcount) : -99,
+ lock->l_pid, lock->l_callback_timeout,
+ lock->l_lvb_type);
+ break;
+ }
+ va_end(args);
+}
+EXPORT_SYMBOL(_ldlm_lock_debug);
Code Review / kvmfornfv.git / blobdiff