-/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
- * vim:expandtab:shiftwidth=8:tabstop=8:
- *
+/*
* GPL HEADER START
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
* Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
- * Copyright (c) 2011, 2012, Whamcloud, Inc.
+ * Copyright (c) 2010, 2013, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
#include <obd_class.h>
#include "ldlm_internal.h"
-cfs_mem_cache_t *ldlm_resource_slab, *ldlm_lock_slab;
+struct kmem_cache *ldlm_resource_slab, *ldlm_lock_slab;
-cfs_atomic_t ldlm_srv_namespace_nr = CFS_ATOMIC_INIT(0);
-cfs_atomic_t ldlm_cli_namespace_nr = CFS_ATOMIC_INIT(0);
+int ldlm_srv_namespace_nr = 0;
+int ldlm_cli_namespace_nr = 0;
-cfs_semaphore_t ldlm_srv_namespace_lock;
+struct mutex ldlm_srv_namespace_lock;
CFS_LIST_HEAD(ldlm_srv_namespace_list);
-cfs_semaphore_t ldlm_cli_namespace_lock;
-CFS_LIST_HEAD(ldlm_cli_namespace_list);
+struct mutex ldlm_cli_namespace_lock;
+/* Client Namespaces that have active resources in them.
+ * Once all resources go away, ldlm_poold moves such namespaces to the
+ * inactive list */
+CFS_LIST_HEAD(ldlm_cli_active_namespace_list);
+/* Client namespaces that don't have any locks in them */
+CFS_LIST_HEAD(ldlm_cli_inactive_namespace_list);
cfs_proc_dir_entry_t *ldlm_type_proc_dir = NULL;
cfs_proc_dir_entry_t *ldlm_ns_proc_dir = NULL;
extern unsigned int ldlm_cancel_unused_locks_before_replay;
+/* during debug dump certain amount of granted locks for one resource to avoid
+ * DDOS. */
+unsigned int ldlm_dump_granted_max = 256;
+
#ifdef LPROCFS
static int ldlm_proc_dump_ns(struct file *file, const char *buffer,
unsigned long count, void *data)
int rc;
struct lprocfs_vars list[] = {
{ "dump_namespaces", NULL, ldlm_proc_dump_ns, NULL },
+ { "dump_granted_max",
+ lprocfs_rd_uint, lprocfs_wr_uint,
+ &ldlm_dump_granted_max, NULL },
{ "cancel_unused_locks_before_replay",
lprocfs_rd_uint, lprocfs_wr_uint,
&ldlm_cancel_unused_locks_before_replay, NULL },
int lru_resize;
dummy[MAX_STRING_SIZE] = '\0';
- if (cfs_copy_from_user(dummy, buffer, MAX_STRING_SIZE))
+ if (copy_from_user(dummy, buffer, MAX_STRING_SIZE))
return -EFAULT;
if (strncmp(dummy, "clear", 5) == 0) {
int canceled, unused = ns->ns_nr_unused;
/* Try to cancel all @ns_nr_unused locks. */
- canceled = ldlm_cancel_lru(ns, unused, LDLM_SYNC,
- LDLM_CANCEL_PASSED);
+ canceled = ldlm_cancel_lru(ns, unused, 0,
+ LDLM_CANCEL_PASSED);
if (canceled < unused) {
CDEBUG(D_DLMTRACE,
"not all requested locks are canceled, "
} else {
tmp = ns->ns_max_unused;
ns->ns_max_unused = 0;
- ldlm_cancel_lru(ns, 0, LDLM_SYNC, LDLM_CANCEL_PASSED);
+ ldlm_cancel_lru(ns, 0, 0, LDLM_CANCEL_PASSED);
ns->ns_max_unused = tmp;
}
return count;
"changing namespace %s unused locks from %u to %u\n",
ldlm_ns_name(ns), ns->ns_nr_unused,
(unsigned int)tmp);
- ldlm_cancel_lru(ns, tmp, LDLM_ASYNC, LDLM_CANCEL_PASSED);
+ ldlm_cancel_lru(ns, tmp, LCF_ASYNC, LDLM_CANCEL_PASSED);
if (!lru_resize) {
CDEBUG(D_DLMTRACE,
ldlm_ns_name(ns), ns->ns_max_unused,
(unsigned int)tmp);
ns->ns_max_unused = (unsigned int)tmp;
- ldlm_cancel_lru(ns, 0, LDLM_ASYNC, LDLM_CANCEL_PASSED);
+ ldlm_cancel_lru(ns, 0, LCF_ASYNC, LDLM_CANCEL_PASSED);
- /* Make sure that originally lru resize was supported before
- * turning it on here. */
+ /* Make sure that LRU resize was originally supported before
+ * turning it on here. */
if (lru_resize &&
(ns->ns_orig_connect_flags & OBD_CONNECT_LRU_RESIZE)) {
CDEBUG(D_DLMTRACE,
return count;
}
+static int lprocfs_rd_elc(char *page, char **start, off_t off,
+ int count, int *eof, void *data)
+{
+ struct ldlm_namespace *ns = data;
+ unsigned int supp = ns_connect_cancelset(ns);
+
+ return lprocfs_rd_uint(page, start, off, count, eof, &supp);
+}
+
+static int lprocfs_wr_elc(struct file *file, const char *buffer,
+ unsigned long count, void *data)
+{
+ struct ldlm_namespace *ns = data;
+ unsigned int supp = -1;
+ int rc;
+
+ rc = lprocfs_wr_uint(file, buffer, count, &supp);
+ if (rc < 0)
+ return rc;
+
+ if (supp == 0)
+ ns->ns_connect_flags &= ~OBD_CONNECT_CANCELSET;
+ else if (ns->ns_orig_connect_flags & OBD_CONNECT_CANCELSET)
+ ns->ns_connect_flags |= OBD_CONNECT_CANCELSET;
+ return count;
+}
+
void ldlm_namespace_proc_unregister(struct ldlm_namespace *ns)
{
struct proc_dir_entry *dir;
lock_vars[0].read_fptr = lprocfs_rd_uint;
lock_vars[0].write_fptr = lprocfs_wr_uint;
lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
+
+ snprintf(lock_name, MAX_STRING_SIZE, "%s/early_lock_cancel",
+ ldlm_ns_name(ns));
+ lock_vars[0].data = ns;
+ lock_vars[0].read_fptr = lprocfs_rd_elc;
+ lock_vars[0].write_fptr = lprocfs_wr_elc;
+ lprocfs_add_vars(ldlm_ns_proc_dir, lock_vars, 0);
} else {
snprintf(lock_name, MAX_STRING_SIZE, "%s/ctime_age_limit",
ldlm_ns_name(ns));
__u32 val;
fid.f_seq = id->name[LUSTRE_RES_ID_SEQ_OFF];
- fid.f_oid = (__u32)id->name[LUSTRE_RES_ID_OID_OFF];
- fid.f_ver = (__u32)id->name[LUSTRE_RES_ID_VER_OFF];
+ fid.f_oid = (__u32)id->name[LUSTRE_RES_ID_VER_OID_OFF];
+ fid.f_ver = (__u32)(id->name[LUSTRE_RES_ID_VER_OID_OFF] >> 32);
hash = fid_flatten32(&fid);
hash += (hash >> 4) + (hash << 12); /* mixing oid and seq */
res = cfs_hlist_entry(hnode, struct ldlm_resource, lr_hash);
ldlm_resource_getref(res);
- LDLM_RESOURCE_ADDREF(res);
}
static void ldlm_res_hop_put_locked(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
res = cfs_hlist_entry(hnode, struct ldlm_resource, lr_hash);
/* cfs_hash_for_each_nolock is the only chance we call it */
- LDLM_RESOURCE_DELREF(res);
ldlm_resource_putref_locked(res);
}
struct ldlm_resource *res;
res = cfs_hlist_entry(hnode, struct ldlm_resource, lr_hash);
- LDLM_RESOURCE_DELREF(res);
ldlm_resource_putref(res);
}
},
};
+/**
+ * Create and initialize new empty namespace.
+ */
struct ldlm_namespace *ldlm_namespace_new(struct obd_device *obd, char *name,
ldlm_side_t client,
ldlm_appetite_t apt,
CFS_INIT_LIST_HEAD(&ns->ns_list_chain);
CFS_INIT_LIST_HEAD(&ns->ns_unused_list);
- cfs_spin_lock_init(&ns->ns_lock);
+ spin_lock_init(&ns->ns_lock);
cfs_atomic_set(&ns->ns_bref, 0);
cfs_waitq_init(&ns->ns_waitq);
GOTO(out_hash, rc);
}
- idx = cfs_atomic_read(ldlm_namespace_nr(client));
+ idx = ldlm_namespace_nr_read(client);
rc = ldlm_pool_init(&ns->ns_pool, ns, idx, client);
if (rc) {
CERROR("Can't initialize lock pool, rc %d\n", rc);
ldlm_put_ref();
RETURN(NULL);
}
+EXPORT_SYMBOL(ldlm_namespace_new);
extern struct ldlm_lock *ldlm_lock_get(struct ldlm_lock *lock);
-/* If flags contains FL_LOCAL_ONLY, don't try to tell the server, just cleanup.
- * This is currently only used for recovery, and we make certain assumptions
- * as a result--notably, that we shouldn't cancel locks with refs. -phil */
+/**
+ * Cancel and destroy all locks on a resource.
+ *
+ * If flags contains FL_LOCAL_ONLY, don't try to tell the server, just
+ * clean up. This is currently only used for recovery, and we make
+ * certain assumptions as a result--notably, that we shouldn't cancel
+ * locks with refs.
+ */
static void cleanup_resource(struct ldlm_resource *res, cfs_list_t *q,
- int flags)
+ __u64 flags)
{
- cfs_list_t *tmp;
- int rc = 0, client = ns_is_client(ldlm_res_to_ns(res));
- int local_only = (flags & LDLM_FL_LOCAL_ONLY);
+ cfs_list_t *tmp;
+ int rc = 0, client = ns_is_client(ldlm_res_to_ns(res));
+ bool local_only = !!(flags & LDLM_FL_LOCAL_ONLY);
do {
struct ldlm_lock *lock = NULL;
- /* first, we look for non-cleaned-yet lock
- * all cleaned locks are marked by CLEANED flag */
+ /* First, we look for non-cleaned-yet lock
+ * all cleaned locks are marked by CLEANED flag. */
lock_res(res);
cfs_list_for_each(tmp, q) {
lock = cfs_list_entry(tmp, struct ldlm_lock,
}
/* Set CBPENDING so nothing in the cancellation path
- * can match this lock */
+ * can match this lock. */
lock->l_flags |= LDLM_FL_CBPENDING;
lock->l_flags |= LDLM_FL_FAILED;
lock->l_flags |= flags;
unlock_res(res);
ldlm_lock2handle(lock, &lockh);
- rc = ldlm_cli_cancel(&lockh);
+ rc = ldlm_cli_cancel(&lockh, LCF_ASYNC);
if (rc)
CERROR("ldlm_cli_cancel: %d\n", rc);
} else {
cfs_hlist_node_t *hnode, void *arg)
{
struct ldlm_resource *res = cfs_hash_object(hs, hnode);
- int flags = (int)(unsigned long)arg;
+ __u64 flags = *(__u64 *)arg;
cleanup_resource(res, &res->lr_granted, flags);
cleanup_resource(res, &res->lr_converting, flags);
}
static int ldlm_resource_complain(cfs_hash_t *hs, cfs_hash_bd_t *bd,
- cfs_hlist_node_t *hnode, void *arg)
+ cfs_hlist_node_t *hnode, void *arg)
{
- struct ldlm_resource *res = cfs_hash_object(hs, hnode);
-
- CERROR("Namespace %s resource refcount nonzero "
- "(%d) after lock cleanup; forcing "
- "cleanup.\n",
- ldlm_ns_name(ldlm_res_to_ns(res)),
- cfs_atomic_read(&res->lr_refcount) - 1);
-
- CERROR("Resource: %p ("LPU64"/"LPU64"/"LPU64"/"
- LPU64") (rc: %d)\n", res,
- res->lr_name.name[0], res->lr_name.name[1],
- res->lr_name.name[2], res->lr_name.name[3],
- cfs_atomic_read(&res->lr_refcount) - 1);
- return 0;
+ struct ldlm_resource *res = cfs_hash_object(hs, hnode);
+
+ lock_res(res);
+ CERROR("%s: namespace resource "DLDLMRES" (%p) refcount nonzero "
+ "(%d) after lock cleanup; forcing cleanup.\n",
+ ldlm_ns_name(ldlm_res_to_ns(res)), PLDLMRES(res), res,
+ cfs_atomic_read(&res->lr_refcount) - 1);
+
+ ldlm_resource_dump(D_ERROR, res);
+ unlock_res(res);
+ return 0;
}
-int ldlm_namespace_cleanup(struct ldlm_namespace *ns, int flags)
+/**
+ * Cancel and destroy all locks in the namespace.
+ *
+ * Typically used during evictions when server notified client that it was
+ * evicted and all of its state needs to be destroyed.
+ * Also used during shutdown.
+ */
+int ldlm_namespace_cleanup(struct ldlm_namespace *ns, __u64 flags)
{
if (ns == NULL) {
CDEBUG(D_INFO, "NULL ns, skipping cleanup\n");
return ELDLM_OK;
}
- cfs_hash_for_each_nolock(ns->ns_rs_hash, ldlm_resource_clean,
- (void *)(unsigned long)flags);
+ cfs_hash_for_each_nolock(ns->ns_rs_hash, ldlm_resource_clean, &flags);
cfs_hash_for_each_nolock(ns->ns_rs_hash, ldlm_resource_complain, NULL);
return ELDLM_OK;
}
+EXPORT_SYMBOL(ldlm_namespace_cleanup);
+/**
+ * Attempts to free namespace.
+ *
+ * Only used when namespace goes away, like during an unmount.
+ */
static int __ldlm_namespace_free(struct ldlm_namespace *ns, int force)
{
ENTRY;
}
/**
- * Performs various cleanups for passed \a ns to make it drop refc and be ready
- * for freeing. Waits for refc == 0.
+ * Performs various cleanups for passed \a ns to make it drop refc and be
+ * ready for freeing. Waits for refc == 0.
*
* The following is done:
- * (0) Unregister \a ns from its list to make inaccessible for potential users
- * like pools thread and others;
+ * (0) Unregister \a ns from its list to make inaccessible for potential
+ * users like pools thread and others;
* (1) Clear all locks in \a ns.
*/
void ldlm_namespace_free_prior(struct ldlm_namespace *ns,
return;
}
- cfs_spin_lock(&ns->ns_lock);
- ns->ns_stopping = 1;
- cfs_spin_unlock(&ns->ns_lock);
+ spin_lock(&ns->ns_lock);
+ ns->ns_stopping = 1;
+ spin_unlock(&ns->ns_lock);
/*
* Can fail with -EINTR when force == 0 in which case try harder.
}
/**
- * Performs freeing memory structures related to \a ns. This is only done when
- * ldlm_namespce_free_prior() successfully removed all resources referencing
- * \a ns and its refc == 0.
+ * Performs freeing memory structures related to \a ns. This is only done
+ * when ldlm_namespce_free_prior() successfully removed all resources
+ * referencing \a ns and its refc == 0.
*/
void ldlm_namespace_free_post(struct ldlm_namespace *ns)
{
return;
}
-
- /*
- * Make sure that nobody can find this ns in its list.
- */
- ldlm_namespace_unregister(ns, ns->ns_client);
- /*
- * Fini pool _before_ parent proc dir is removed. This is important as
- * ldlm_pool_fini() removes own proc dir which is child to @dir. Removing
- * it after @dir may cause oops.
- */
- ldlm_pool_fini(&ns->ns_pool);
-
- ldlm_namespace_proc_unregister(ns);
- cfs_hash_putref(ns->ns_rs_hash);
- /*
- * Namespace \a ns should be not on list in this time, otherwise this
- * will cause issues realted to using freed \a ns in pools thread.
- */
- LASSERT(cfs_list_empty(&ns->ns_list_chain));
- OBD_FREE_PTR(ns);
- ldlm_put_ref();
- EXIT;
+ /* Make sure that nobody can find this ns in its list. */
+ ldlm_namespace_unregister(ns, ns->ns_client);
+ /* Fini pool _before_ parent proc dir is removed. This is important as
+ * ldlm_pool_fini() removes own proc dir which is child to @dir.
+ * Removing it after @dir may cause oops. */
+ ldlm_pool_fini(&ns->ns_pool);
+
+ ldlm_namespace_proc_unregister(ns);
+ cfs_hash_putref(ns->ns_rs_hash);
+ /* Namespace \a ns should be not on list at this time, otherwise
+ * this will cause issues related to using freed \a ns in poold
+ * thread. */
+ LASSERT(cfs_list_empty(&ns->ns_list_chain));
+ OBD_FREE_PTR(ns);
+ ldlm_put_ref();
+ EXIT;
}
-
-/* Cleanup the resource, and free namespace.
+/**
+ * Cleanup the resource, and free namespace.
* bug 12864:
* Deadlock issue:
* proc1: destroy import
ldlm_namespace_free_prior(ns, imp, force);
ldlm_namespace_free_post(ns);
}
+EXPORT_SYMBOL(ldlm_namespace_free);
void ldlm_namespace_get(struct ldlm_namespace *ns)
{
cfs_atomic_inc(&ns->ns_bref);
}
+EXPORT_SYMBOL(ldlm_namespace_get);
+
+/* This is only for callers that care about refcount */
+int ldlm_namespace_get_return(struct ldlm_namespace *ns)
+{
+ return cfs_atomic_inc_return(&ns->ns_bref);
+}
void ldlm_namespace_put(struct ldlm_namespace *ns)
{
- if (cfs_atomic_dec_and_lock(&ns->ns_bref, &ns->ns_lock)) {
- cfs_waitq_signal(&ns->ns_waitq);
- cfs_spin_unlock(&ns->ns_lock);
- }
+ if (cfs_atomic_dec_and_lock(&ns->ns_bref, &ns->ns_lock)) {
+ cfs_waitq_signal(&ns->ns_waitq);
+ spin_unlock(&ns->ns_lock);
+ }
}
+EXPORT_SYMBOL(ldlm_namespace_put);
-/* Register @ns in the list of namespaces */
+/** Register \a ns in the list of namespaces */
void ldlm_namespace_register(struct ldlm_namespace *ns, ldlm_side_t client)
{
- cfs_mutex_down(ldlm_namespace_lock(client));
- LASSERT(cfs_list_empty(&ns->ns_list_chain));
- cfs_list_add(&ns->ns_list_chain, ldlm_namespace_list(client));
- cfs_atomic_inc(ldlm_namespace_nr(client));
- cfs_mutex_up(ldlm_namespace_lock(client));
+ mutex_lock(ldlm_namespace_lock(client));
+ LASSERT(cfs_list_empty(&ns->ns_list_chain));
+ cfs_list_add(&ns->ns_list_chain, ldlm_namespace_inactive_list(client));
+ ldlm_namespace_nr_inc(client);
+ mutex_unlock(ldlm_namespace_lock(client));
}
-/* Unregister @ns from the list of namespaces */
+/** Unregister \a ns from the list of namespaces. */
void ldlm_namespace_unregister(struct ldlm_namespace *ns, ldlm_side_t client)
{
- cfs_mutex_down(ldlm_namespace_lock(client));
- LASSERT(!cfs_list_empty(&ns->ns_list_chain));
- /*
- * Some asserts and possibly other parts of code still using
- * list_empty(&ns->ns_list_chain). This is why it is important
- * to use list_del_init() here.
- */
- cfs_list_del_init(&ns->ns_list_chain);
- cfs_atomic_dec(ldlm_namespace_nr(client));
- cfs_mutex_up(ldlm_namespace_lock(client));
+ mutex_lock(ldlm_namespace_lock(client));
+ LASSERT(!cfs_list_empty(&ns->ns_list_chain));
+ /* Some asserts and possibly other parts of the code are still
+ * using list_empty(&ns->ns_list_chain). This is why it is
+ * important to use list_del_init() here. */
+ cfs_list_del_init(&ns->ns_list_chain);
+ ldlm_namespace_nr_dec(client);
+ mutex_unlock(ldlm_namespace_lock(client));
+}
+
+/** Should be called with ldlm_namespace_lock(client) taken. */
+void ldlm_namespace_move_to_active_locked(struct ldlm_namespace *ns,
+ ldlm_side_t client)
+{
+ LASSERT(!cfs_list_empty(&ns->ns_list_chain));
+ LASSERT_MUTEX_LOCKED(ldlm_namespace_lock(client));
+ cfs_list_move_tail(&ns->ns_list_chain, ldlm_namespace_list(client));
}
-/* Should be called under ldlm_namespace_lock(client) taken */
-void ldlm_namespace_move_locked(struct ldlm_namespace *ns, ldlm_side_t client)
+/** Should be called with ldlm_namespace_lock(client) taken. */
+void ldlm_namespace_move_to_inactive_locked(struct ldlm_namespace *ns,
+ ldlm_side_t client)
{
- LASSERT(!cfs_list_empty(&ns->ns_list_chain));
- LASSERT_SEM_LOCKED(ldlm_namespace_lock(client));
- cfs_list_move_tail(&ns->ns_list_chain, ldlm_namespace_list(client));
+ LASSERT(!cfs_list_empty(&ns->ns_list_chain));
+ LASSERT_MUTEX_LOCKED(ldlm_namespace_lock(client));
+ cfs_list_move_tail(&ns->ns_list_chain,
+ ldlm_namespace_inactive_list(client));
}
-/* Should be called under ldlm_namespace_lock(client) taken */
+/** Should be called with ldlm_namespace_lock(client) taken. */
struct ldlm_namespace *ldlm_namespace_first_locked(ldlm_side_t client)
{
- LASSERT_SEM_LOCKED(ldlm_namespace_lock(client));
+ LASSERT_MUTEX_LOCKED(ldlm_namespace_lock(client));
LASSERT(!cfs_list_empty(ldlm_namespace_list(client)));
return container_of(ldlm_namespace_list(client)->next,
struct ldlm_namespace, ns_list_chain);
}
+/** Create and initialize new resource. */
static struct ldlm_resource *ldlm_resource_new(void)
{
struct ldlm_resource *res;
int idx;
- OBD_SLAB_ALLOC_PTR_GFP(res, ldlm_resource_slab, CFS_ALLOC_IO);
+ OBD_SLAB_ALLOC_PTR_GFP(res, ldlm_resource_slab, __GFP_IO);
if (res == NULL)
return NULL;
CFS_INIT_LIST_HEAD(&res->lr_converting);
CFS_INIT_LIST_HEAD(&res->lr_waiting);
- /* initialize interval trees for each lock mode*/
+ /* Initialize interval trees for each lock mode. */
for (idx = 0; idx < LCK_MODE_NUM; idx++) {
res->lr_itree[idx].lit_size = 0;
res->lr_itree[idx].lit_mode = 1 << idx;
}
cfs_atomic_set(&res->lr_refcount, 1);
- cfs_spin_lock_init(&res->lr_lock);
- lu_ref_init(&res->lr_reference);
+ spin_lock_init(&res->lr_lock);
+ lu_ref_init(&res->lr_reference);
- /* one who creates the resource must unlock
- * the semaphore after lvb initialization */
- cfs_init_mutex_locked(&res->lr_lvb_sem);
+ /* The creator of the resource must unlock the mutex after LVB
+ * initialization. */
+ mutex_init(&res->lr_lvb_mutex);
+ mutex_lock(&res->lr_lvb_mutex);
- return res;
+ return res;
}
-/* Args: unlocked namespace
- * * Locks: takes and releases NS hash-lock and res->lr_lock
- * * Returns: referenced, unlocked ldlm_resource or NULL */
+/**
+ * Return a reference to resource with given name, creating it if necessary.
+ * Args: namespace with ns_lock unlocked
+ * Locks: takes and releases NS hash-lock and res->lr_lock
+ * Returns: referenced, unlocked ldlm_resource or NULL
+ */
struct ldlm_resource *
ldlm_resource_get(struct ldlm_namespace *ns, struct ldlm_resource *parent,
const struct ldlm_res_id *name, ldlm_type_t type, int create)
struct ldlm_resource *res;
cfs_hash_bd_t bd;
__u64 version;
+ int ns_refcount = 0;
LASSERT(ns != NULL);
LASSERT(parent == NULL);
if (hnode != NULL) {
cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 0);
res = cfs_hlist_entry(hnode, struct ldlm_resource, lr_hash);
- /* synchronize WRT resource creation */
+ /* Synchronize with regard to resource creation. */
if (ns->ns_lvbo && ns->ns_lvbo->lvbo_init) {
- cfs_down(&res->lr_lvb_sem);
- cfs_up(&res->lr_lvb_sem);
+ mutex_lock(&res->lr_lvb_mutex);
+ mutex_unlock(&res->lr_lvb_mutex);
}
+
+ if (unlikely(res->lr_lvb_len < 0)) {
+ ldlm_resource_putref(res);
+ res = NULL;
+ }
return res;
}
cfs_hash_bd_lookup_locked(ns->ns_rs_hash, &bd, (void *)name);
if (hnode != NULL) {
- /* someone won the race and added the resource before */
- cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 1);
- /* clean lu_ref for failed resource */
- lu_ref_fini(&res->lr_reference);
- OBD_SLAB_FREE(res, ldlm_resource_slab, sizeof *res);
-
- res = cfs_hlist_entry(hnode, struct ldlm_resource, lr_hash);
- /* synchronize WRT resource creation */
- if (ns->ns_lvbo && ns->ns_lvbo->lvbo_init) {
- cfs_down(&res->lr_lvb_sem);
- cfs_up(&res->lr_lvb_sem);
- }
- return res;
- }
- /* we won! let's add the resource */
+ /* Someone won the race and already added the resource. */
+ cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 1);
+ /* Clean lu_ref for failed resource. */
+ lu_ref_fini(&res->lr_reference);
+ /* We have taken lr_lvb_mutex. Drop it. */
+ mutex_unlock(&res->lr_lvb_mutex);
+ OBD_SLAB_FREE(res, ldlm_resource_slab, sizeof *res);
+
+ res = cfs_hlist_entry(hnode, struct ldlm_resource, lr_hash);
+ /* Synchronize with regard to resource creation. */
+ if (ns->ns_lvbo && ns->ns_lvbo->lvbo_init) {
+ mutex_lock(&res->lr_lvb_mutex);
+ mutex_unlock(&res->lr_lvb_mutex);
+ }
+
+ if (unlikely(res->lr_lvb_len < 0)) {
+ ldlm_resource_putref(res);
+ res = NULL;
+ }
+ return res;
+ }
+ /* We won! Let's add the resource. */
cfs_hash_bd_add_locked(ns->ns_rs_hash, &bd, &res->lr_hash);
- if (cfs_hash_bd_count_get(&bd) == 1)
- ldlm_namespace_get(ns);
+ if (cfs_hash_bd_count_get(&bd) == 1)
+ ns_refcount = ldlm_namespace_get_return(ns);
cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 1);
if (ns->ns_lvbo && ns->ns_lvbo->lvbo_init) {
OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_CREATE_RESOURCE, 2);
rc = ns->ns_lvbo->lvbo_init(res);
- if (rc)
- CERROR("lvbo_init failed for resource "
- LPU64": rc %d\n", name->name[0], rc);
- /* we create resource with locked lr_lvb_sem */
- cfs_up(&res->lr_lvb_sem);
- }
-
- return res;
+ if (rc < 0) {
+ CERROR("%s: lvbo_init failed for resource "LPX64":"
+ LPX64": rc = %d\n", ns->ns_obd->obd_name,
+ name->name[0], name->name[1], rc);
+ if (res->lr_lvb_data) {
+ OBD_FREE(res->lr_lvb_data, res->lr_lvb_len);
+ res->lr_lvb_data = NULL;
+ }
+ res->lr_lvb_len = rc;
+ mutex_unlock(&res->lr_lvb_mutex);
+ ldlm_resource_putref(res);
+ return NULL;
+ }
+ }
+
+ /* We create resource with locked lr_lvb_mutex. */
+ mutex_unlock(&res->lr_lvb_mutex);
+
+ /* Let's see if we happened to be the very first resource in this
+ * namespace. If so, and this is a client namespace, we need to move
+ * the namespace into the active namespaces list to be patrolled by
+ * the ldlm_poold. */
+ if (ns_is_client(ns) && ns_refcount == 1) {
+ mutex_lock(ldlm_namespace_lock(LDLM_NAMESPACE_CLIENT));
+ ldlm_namespace_move_to_active_locked(ns, LDLM_NAMESPACE_CLIENT);
+ mutex_unlock(ldlm_namespace_lock(LDLM_NAMESPACE_CLIENT));
+ }
+
+ return res;
}
+EXPORT_SYMBOL(ldlm_resource_get);
struct ldlm_resource *ldlm_resource_getref(struct ldlm_resource *res)
{
}
return 0;
}
+EXPORT_SYMBOL(ldlm_resource_putref);
/* Returns 1 if the resource was freed, 0 if it remains. */
int ldlm_resource_putref_locked(struct ldlm_resource *res)
return 0;
}
+/**
+ * Add a lock into a given resource into specified lock list.
+ */
void ldlm_resource_add_lock(struct ldlm_resource *res, cfs_list_t *head,
struct ldlm_lock *lock)
{
- check_res_locked(res);
+ check_res_locked(res);
- CDEBUG(D_OTHER, "About to add this lock:\n");
- ldlm_lock_dump(D_OTHER, lock, 0);
+ LDLM_DEBUG(lock, "About to add this lock:\n");
- if (lock->l_destroyed) {
- CDEBUG(D_OTHER, "Lock destroyed, not adding to resource\n");
- return;
- }
+ if (lock->l_flags & LDLM_FL_DESTROYED) {
+ CDEBUG(D_OTHER, "Lock destroyed, not adding to resource\n");
+ return;
+ }
- LASSERT(cfs_list_empty(&lock->l_res_link));
+ LASSERT(cfs_list_empty(&lock->l_res_link));
- cfs_list_add_tail(&lock->l_res_link, head);
+ cfs_list_add_tail(&lock->l_res_link, head);
}
+/**
+ * Insert a lock into resource after specified lock.
+ *
+ * Obtain resource description from the lock we are inserting after.
+ */
void ldlm_resource_insert_lock_after(struct ldlm_lock *original,
struct ldlm_lock *new)
{
check_res_locked(res);
ldlm_resource_dump(D_INFO, res);
- CDEBUG(D_OTHER, "About to insert this lock after %p:\n", original);
- ldlm_lock_dump(D_OTHER, new, 0);
+ LDLM_DEBUG(new, "About to insert this lock after %p:\n", original);
- if (new->l_destroyed) {
- CDEBUG(D_OTHER, "Lock destroyed, not adding to resource\n");
- goto out;
- }
+ if (new->l_flags & LDLM_FL_DESTROYED) {
+ CDEBUG(D_OTHER, "Lock destroyed, not adding to resource\n");
+ goto out;
+ }
LASSERT(cfs_list_empty(&new->l_res_link));
ldlm_extent_unlink_lock(lock);
cfs_list_del_init(&lock->l_res_link);
}
+EXPORT_SYMBOL(ldlm_resource_unlink_lock);
void ldlm_res2desc(struct ldlm_resource *res, struct ldlm_resource_desc *desc)
{
desc->lr_name = res->lr_name;
}
+/**
+ * Print information about all locks in all namespaces on this node to debug
+ * log.
+ */
void ldlm_dump_all_namespaces(ldlm_side_t client, int level)
{
cfs_list_t *tmp;
if (!((libcfs_debug | D_ERROR) & level))
return;
- cfs_mutex_down(ldlm_namespace_lock(client));
+ mutex_lock(ldlm_namespace_lock(client));
cfs_list_for_each(tmp, ldlm_namespace_list(client)) {
struct ldlm_namespace *ns;
ldlm_namespace_dump(level, ns);
}
- cfs_mutex_up(ldlm_namespace_lock(client));
+ mutex_unlock(ldlm_namespace_lock(client));
}
+EXPORT_SYMBOL(ldlm_dump_all_namespaces);
static int ldlm_res_hash_dump(cfs_hash_t *hs, cfs_hash_bd_t *bd,
cfs_hlist_node_t *hnode, void *arg)
return 0;
}
+/**
+ * Print information about all locks in this namespace on this node to debug
+ * log.
+ */
void ldlm_namespace_dump(int level, struct ldlm_namespace *ns)
{
if (!((libcfs_debug | D_ERROR) & level))
cfs_hash_for_each_nolock(ns->ns_rs_hash,
ldlm_res_hash_dump,
(void *)(unsigned long)level);
- cfs_spin_lock(&ns->ns_lock);
- ns->ns_next_dump = cfs_time_shift(10);
- cfs_spin_unlock(&ns->ns_lock);
+ spin_lock(&ns->ns_lock);
+ ns->ns_next_dump = cfs_time_shift(10);
+ spin_unlock(&ns->ns_lock);
}
+EXPORT_SYMBOL(ldlm_namespace_dump);
+/**
+ * Print information about all locks in this resource to debug log.
+ */
void ldlm_resource_dump(int level, struct ldlm_resource *res)
{
- cfs_list_t *tmp;
- int pos;
+ struct ldlm_lock *lock;
+ unsigned int granted = 0;
- CLASSERT(RES_NAME_SIZE == 4);
+ CLASSERT(RES_NAME_SIZE == 4);
- if (!((libcfs_debug | D_ERROR) & level))
- return;
+ if (!((libcfs_debug | D_ERROR) & level))
+ return;
- CDEBUG(level, "--- Resource: %p ("LPU64"/"LPU64"/"LPU64"/"LPU64
- ") (rc: %d)\n", res, res->lr_name.name[0], res->lr_name.name[1],
- res->lr_name.name[2], res->lr_name.name[3],
- cfs_atomic_read(&res->lr_refcount));
+ CDEBUG(level, "--- Resource: "DLDLMRES" (%p) refcount = %d\n",
+ PLDLMRES(res), res, cfs_atomic_read(&res->lr_refcount));
if (!cfs_list_empty(&res->lr_granted)) {
- pos = 0;
- CDEBUG(level, "Granted locks:\n");
- cfs_list_for_each(tmp, &res->lr_granted) {
- struct ldlm_lock *lock;
- lock = cfs_list_entry(tmp, struct ldlm_lock,
- l_res_link);
- ldlm_lock_dump(level, lock, ++pos);
+ CDEBUG(level, "Granted locks (in reverse order):\n");
+ cfs_list_for_each_entry_reverse(lock, &res->lr_granted,
+ l_res_link) {
+ LDLM_DEBUG_LIMIT(level, lock, "###");
+ if (!(level & D_CANTMASK) &&
+ ++granted > ldlm_dump_granted_max) {
+ CDEBUG(level, "only dump %d granted locks to "
+ "avoid DDOS.\n", granted);
+ break;
+ }
}
}
if (!cfs_list_empty(&res->lr_converting)) {
- pos = 0;
CDEBUG(level, "Converting locks:\n");
- cfs_list_for_each(tmp, &res->lr_converting) {
- struct ldlm_lock *lock;
- lock = cfs_list_entry(tmp, struct ldlm_lock,
- l_res_link);
- ldlm_lock_dump(level, lock, ++pos);
- }
+ cfs_list_for_each_entry(lock, &res->lr_converting, l_res_link)
+ LDLM_DEBUG_LIMIT(level, lock, "###");
}
if (!cfs_list_empty(&res->lr_waiting)) {
- pos = 0;
CDEBUG(level, "Waiting locks:\n");
- cfs_list_for_each(tmp, &res->lr_waiting) {
- struct ldlm_lock *lock;
- lock = cfs_list_entry(tmp, struct ldlm_lock,
- l_res_link);
- ldlm_lock_dump(level, lock, ++pos);
- }
+ cfs_list_for_each_entry(lock, &res->lr_waiting, l_res_link)
+ LDLM_DEBUG_LIMIT(level, lock, "###");
}
}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff