--- /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_resource.c
+ *
+ * Author: Phil Schwan <phil@clusterfs.com>
+ * Author: Peter Braam <braam@clusterfs.com>
+ */
+
+#define DEBUG_SUBSYSTEM S_LDLM
+#include "../include/lustre_dlm.h"
+#include "../include/lustre_fid.h"
+#include "../include/obd_class.h"
+#include "ldlm_internal.h"
+
+struct kmem_cache *ldlm_resource_slab, *ldlm_lock_slab;
+
+int ldlm_srv_namespace_nr = 0;
+int ldlm_cli_namespace_nr = 0;
+
+struct mutex ldlm_srv_namespace_lock;
+LIST_HEAD(ldlm_srv_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 */
+LIST_HEAD(ldlm_cli_active_namespace_list);
+/* Client namespaces that don't have any locks in them */
+LIST_HEAD(ldlm_cli_inactive_namespace_list);
+
+struct proc_dir_entry *ldlm_type_proc_dir = NULL;
+static struct proc_dir_entry *ldlm_ns_proc_dir = NULL;
+struct proc_dir_entry *ldlm_svc_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;
+
+#if defined(CONFIG_PROC_FS)
+static ssize_t lprocfs_wr_dump_ns(struct file *file, const char __user *buffer,
+ size_t count, loff_t *off)
+{
+ ldlm_dump_all_namespaces(LDLM_NAMESPACE_SERVER, D_DLMTRACE);
+ ldlm_dump_all_namespaces(LDLM_NAMESPACE_CLIENT, D_DLMTRACE);
+ return count;
+}
+LPROC_SEQ_FOPS_WR_ONLY(ldlm, dump_ns);
+
+LPROC_SEQ_FOPS_RW_TYPE(ldlm_rw, uint);
+LPROC_SEQ_FOPS_RO_TYPE(ldlm, uint);
+
+int ldlm_proc_setup(void)
+{
+ int rc;
+ struct lprocfs_vars list[] = {
+ { "dump_namespaces", &ldlm_dump_ns_fops, NULL, 0222 },
+ { "dump_granted_max", &ldlm_rw_uint_fops,
+ &ldlm_dump_granted_max },
+ { "cancel_unused_locks_before_replay", &ldlm_rw_uint_fops,
+ &ldlm_cancel_unused_locks_before_replay },
+ { NULL } };
+ LASSERT(ldlm_ns_proc_dir == NULL);
+
+ ldlm_type_proc_dir = lprocfs_register(OBD_LDLM_DEVICENAME,
+ proc_lustre_root,
+ NULL, NULL);
+ if (IS_ERR(ldlm_type_proc_dir)) {
+ CERROR("LProcFS failed in ldlm-init\n");
+ rc = PTR_ERR(ldlm_type_proc_dir);
+ goto err;
+ }
+
+ ldlm_ns_proc_dir = lprocfs_register("namespaces",
+ ldlm_type_proc_dir,
+ NULL, NULL);
+ if (IS_ERR(ldlm_ns_proc_dir)) {
+ CERROR("LProcFS failed in ldlm-init\n");
+ rc = PTR_ERR(ldlm_ns_proc_dir);
+ goto err_type;
+ }
+
+ ldlm_svc_proc_dir = lprocfs_register("services",
+ ldlm_type_proc_dir,
+ NULL, NULL);
+ if (IS_ERR(ldlm_svc_proc_dir)) {
+ CERROR("LProcFS failed in ldlm-init\n");
+ rc = PTR_ERR(ldlm_svc_proc_dir);
+ goto err_ns;
+ }
+
+ rc = lprocfs_add_vars(ldlm_type_proc_dir, list, NULL);
+
+ return 0;
+
+err_ns:
+ lprocfs_remove(&ldlm_ns_proc_dir);
+err_type:
+ lprocfs_remove(&ldlm_type_proc_dir);
+err:
+ ldlm_svc_proc_dir = NULL;
+ ldlm_type_proc_dir = NULL;
+ ldlm_ns_proc_dir = NULL;
+ return rc;
+}
+
+void ldlm_proc_cleanup(void)
+{
+ if (ldlm_svc_proc_dir)
+ lprocfs_remove(&ldlm_svc_proc_dir);
+
+ if (ldlm_ns_proc_dir)
+ lprocfs_remove(&ldlm_ns_proc_dir);
+
+ if (ldlm_type_proc_dir)
+ lprocfs_remove(&ldlm_type_proc_dir);
+
+ ldlm_svc_proc_dir = NULL;
+ ldlm_type_proc_dir = NULL;
+ ldlm_ns_proc_dir = NULL;
+}
+
+static int lprocfs_ns_resources_seq_show(struct seq_file *m, void *v)
+{
+ struct ldlm_namespace *ns = m->private;
+ __u64 res = 0;
+ struct cfs_hash_bd bd;
+ int i;
+
+ /* result is not strictly consistent */
+ cfs_hash_for_each_bucket(ns->ns_rs_hash, &bd, i)
+ res += cfs_hash_bd_count_get(&bd);
+ return lprocfs_rd_u64(m, &res);
+}
+LPROC_SEQ_FOPS_RO(lprocfs_ns_resources);
+
+static int lprocfs_ns_locks_seq_show(struct seq_file *m, void *v)
+{
+ struct ldlm_namespace *ns = m->private;
+ __u64 locks;
+
+ locks = lprocfs_stats_collector(ns->ns_stats, LDLM_NSS_LOCKS,
+ LPROCFS_FIELDS_FLAGS_SUM);
+ return lprocfs_rd_u64(m, &locks);
+}
+LPROC_SEQ_FOPS_RO(lprocfs_ns_locks);
+
+static int lprocfs_lru_size_seq_show(struct seq_file *m, void *v)
+{
+ struct ldlm_namespace *ns = m->private;
+ __u32 *nr = &ns->ns_max_unused;
+
+ if (ns_connect_lru_resize(ns))
+ nr = &ns->ns_nr_unused;
+ return lprocfs_rd_uint(m, nr);
+}
+
+static ssize_t lprocfs_lru_size_seq_write(struct file *file,
+ const char __user *buffer,
+ size_t count, loff_t *off)
+{
+ struct ldlm_namespace *ns = ((struct seq_file *)file->private_data)->private;
+ char dummy[MAX_STRING_SIZE + 1];
+ unsigned long tmp;
+ int lru_resize;
+ int err;
+
+ dummy[MAX_STRING_SIZE] = '\0';
+ if (copy_from_user(dummy, buffer, MAX_STRING_SIZE))
+ return -EFAULT;
+
+ if (strncmp(dummy, "clear", 5) == 0) {
+ CDEBUG(D_DLMTRACE,
+ "dropping all unused locks from namespace %s\n",
+ ldlm_ns_name(ns));
+ if (ns_connect_lru_resize(ns)) {
+ int canceled, unused = ns->ns_nr_unused;
+
+ /* Try to cancel all @ns_nr_unused locks. */
+ canceled = ldlm_cancel_lru(ns, unused, 0,
+ LDLM_CANCEL_PASSED);
+ if (canceled < unused) {
+ CDEBUG(D_DLMTRACE,
+ "not all requested locks are canceled, requested: %d, canceled: %d\n",
+ unused,
+ canceled);
+ return -EINVAL;
+ }
+ } else {
+ tmp = ns->ns_max_unused;
+ ns->ns_max_unused = 0;
+ ldlm_cancel_lru(ns, 0, 0, LDLM_CANCEL_PASSED);
+ ns->ns_max_unused = tmp;
+ }
+ return count;
+ }
+
+ err = kstrtoul(dummy, 10, &tmp);
+ if (err != 0) {
+ CERROR("invalid value written\n");
+ return -EINVAL;
+ }
+ lru_resize = (tmp == 0);
+
+ if (ns_connect_lru_resize(ns)) {
+ if (!lru_resize)
+ ns->ns_max_unused = (unsigned int)tmp;
+
+ if (tmp > ns->ns_nr_unused)
+ tmp = ns->ns_nr_unused;
+ tmp = ns->ns_nr_unused - tmp;
+
+ CDEBUG(D_DLMTRACE,
+ "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, LCF_ASYNC, LDLM_CANCEL_PASSED);
+
+ if (!lru_resize) {
+ CDEBUG(D_DLMTRACE,
+ "disable lru_resize for namespace %s\n",
+ ldlm_ns_name(ns));
+ ns->ns_connect_flags &= ~OBD_CONNECT_LRU_RESIZE;
+ }
+ } else {
+ CDEBUG(D_DLMTRACE,
+ "changing namespace %s max_unused from %u to %u\n",
+ ldlm_ns_name(ns), ns->ns_max_unused,
+ (unsigned int)tmp);
+ ns->ns_max_unused = (unsigned int)tmp;
+ ldlm_cancel_lru(ns, 0, LCF_ASYNC, LDLM_CANCEL_PASSED);
+
+ /* 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,
+ "enable lru_resize for namespace %s\n",
+ ldlm_ns_name(ns));
+ ns->ns_connect_flags |= OBD_CONNECT_LRU_RESIZE;
+ }
+ }
+
+ return count;
+}
+LPROC_SEQ_FOPS(lprocfs_lru_size);
+
+static int lprocfs_elc_seq_show(struct seq_file *m, void *v)
+{
+ struct ldlm_namespace *ns = m->private;
+ unsigned int supp = ns_connect_cancelset(ns);
+
+ return lprocfs_rd_uint(m, &supp);
+}
+
+static ssize_t lprocfs_elc_seq_write(struct file *file,
+ const char __user *buffer,
+ size_t count, loff_t *off)
+{
+ struct ldlm_namespace *ns = ((struct seq_file *)file->private_data)->private;
+ 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;
+}
+LPROC_SEQ_FOPS(lprocfs_elc);
+
+void ldlm_namespace_proc_unregister(struct ldlm_namespace *ns)
+{
+ if (ns->ns_proc_dir_entry == NULL)
+ CERROR("dlm namespace %s has no procfs dir?\n",
+ ldlm_ns_name(ns));
+ else
+ lprocfs_remove(&ns->ns_proc_dir_entry);
+
+ if (ns->ns_stats != NULL)
+ lprocfs_free_stats(&ns->ns_stats);
+}
+
+#define LDLM_NS_ADD_VAR(name, var, ops) \
+ do { \
+ snprintf(lock_name, MAX_STRING_SIZE, name); \
+ lock_vars[0].data = var; \
+ lock_vars[0].fops = ops; \
+ lprocfs_add_vars(ns_pde, lock_vars, NULL); \
+ } while (0)
+
+int ldlm_namespace_proc_register(struct ldlm_namespace *ns)
+{
+ struct lprocfs_vars lock_vars[2];
+ char lock_name[MAX_STRING_SIZE + 1];
+ struct proc_dir_entry *ns_pde;
+
+ LASSERT(ns != NULL);
+ LASSERT(ns->ns_rs_hash != NULL);
+
+ if (ns->ns_proc_dir_entry != NULL) {
+ ns_pde = ns->ns_proc_dir_entry;
+ } else {
+ ns_pde = proc_mkdir(ldlm_ns_name(ns), ldlm_ns_proc_dir);
+ if (ns_pde == NULL)
+ return -ENOMEM;
+ ns->ns_proc_dir_entry = ns_pde;
+ }
+
+ ns->ns_stats = lprocfs_alloc_stats(LDLM_NSS_LAST, 0);
+ if (ns->ns_stats == NULL)
+ return -ENOMEM;
+
+ lprocfs_counter_init(ns->ns_stats, LDLM_NSS_LOCKS,
+ LPROCFS_CNTR_AVGMINMAX, "locks", "locks");
+
+ lock_name[MAX_STRING_SIZE] = '\0';
+
+ memset(lock_vars, 0, sizeof(lock_vars));
+ lock_vars[0].name = lock_name;
+
+ LDLM_NS_ADD_VAR("resource_count", ns, &lprocfs_ns_resources_fops);
+ LDLM_NS_ADD_VAR("lock_count", ns, &lprocfs_ns_locks_fops);
+
+ if (ns_is_client(ns)) {
+ LDLM_NS_ADD_VAR("lock_unused_count", &ns->ns_nr_unused,
+ &ldlm_uint_fops);
+ LDLM_NS_ADD_VAR("lru_size", ns, &lprocfs_lru_size_fops);
+ LDLM_NS_ADD_VAR("lru_max_age", &ns->ns_max_age,
+ &ldlm_rw_uint_fops);
+ LDLM_NS_ADD_VAR("early_lock_cancel", ns, &lprocfs_elc_fops);
+ } else {
+ LDLM_NS_ADD_VAR("ctime_age_limit", &ns->ns_ctime_age_limit,
+ &ldlm_rw_uint_fops);
+ LDLM_NS_ADD_VAR("lock_timeouts", &ns->ns_timeouts,
+ &ldlm_uint_fops);
+ LDLM_NS_ADD_VAR("max_nolock_bytes", &ns->ns_max_nolock_size,
+ &ldlm_rw_uint_fops);
+ LDLM_NS_ADD_VAR("contention_seconds", &ns->ns_contention_time,
+ &ldlm_rw_uint_fops);
+ LDLM_NS_ADD_VAR("contended_locks", &ns->ns_contended_locks,
+ &ldlm_rw_uint_fops);
+ LDLM_NS_ADD_VAR("max_parallel_ast", &ns->ns_max_parallel_ast,
+ &ldlm_rw_uint_fops);
+ }
+ return 0;
+}
+#undef MAX_STRING_SIZE
+#else /* CONFIG_PROC_FS */
+
+#define ldlm_namespace_proc_unregister(ns) ({; })
+#define ldlm_namespace_proc_register(ns) ({0; })
+
+#endif /* CONFIG_PROC_FS */
+
+static unsigned ldlm_res_hop_hash(struct cfs_hash *hs,
+ const void *key, unsigned mask)
+{
+ const struct ldlm_res_id *id = key;
+ unsigned val = 0;
+ unsigned i;
+
+ for (i = 0; i < RES_NAME_SIZE; i++)
+ val += id->name[i];
+ return val & mask;
+}
+
+static unsigned ldlm_res_hop_fid_hash(struct cfs_hash *hs,
+ const void *key, unsigned mask)
+{
+ const struct ldlm_res_id *id = key;
+ struct lu_fid fid;
+ __u32 hash;
+ __u32 val;
+
+ fid.f_seq = id->name[LUSTRE_RES_ID_SEQ_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 */
+ if (id->name[LUSTRE_RES_ID_HSH_OFF] != 0) {
+ val = id->name[LUSTRE_RES_ID_HSH_OFF];
+ hash += (val >> 5) + (val << 11);
+ } else {
+ val = fid_oid(&fid);
+ }
+ hash = hash_long(hash, hs->hs_bkt_bits);
+ /* give me another random factor */
+ hash -= hash_long((unsigned long)hs, val % 11 + 3);
+
+ hash <<= hs->hs_cur_bits - hs->hs_bkt_bits;
+ hash |= ldlm_res_hop_hash(hs, key, CFS_HASH_NBKT(hs) - 1);
+
+ return hash & mask;
+}
+
+static void *ldlm_res_hop_key(struct hlist_node *hnode)
+{
+ struct ldlm_resource *res;
+
+ res = hlist_entry(hnode, struct ldlm_resource, lr_hash);
+ return &res->lr_name;
+}
+
+static int ldlm_res_hop_keycmp(const void *key, struct hlist_node *hnode)
+{
+ struct ldlm_resource *res;
+
+ res = hlist_entry(hnode, struct ldlm_resource, lr_hash);
+ return ldlm_res_eq((const struct ldlm_res_id *)key,
+ (const struct ldlm_res_id *)&res->lr_name);
+}
+
+static void *ldlm_res_hop_object(struct hlist_node *hnode)
+{
+ return hlist_entry(hnode, struct ldlm_resource, lr_hash);
+}
+
+static void ldlm_res_hop_get_locked(struct cfs_hash *hs,
+ struct hlist_node *hnode)
+{
+ struct ldlm_resource *res;
+
+ res = hlist_entry(hnode, struct ldlm_resource, lr_hash);
+ ldlm_resource_getref(res);
+}
+
+static void ldlm_res_hop_put_locked(struct cfs_hash *hs,
+ struct hlist_node *hnode)
+{
+ struct ldlm_resource *res;
+
+ res = hlist_entry(hnode, struct ldlm_resource, lr_hash);
+ /* cfs_hash_for_each_nolock is the only chance we call it */
+ ldlm_resource_putref_locked(res);
+}
+
+static void ldlm_res_hop_put(struct cfs_hash *hs, struct hlist_node *hnode)
+{
+ struct ldlm_resource *res;
+
+ res = hlist_entry(hnode, struct ldlm_resource, lr_hash);
+ ldlm_resource_putref(res);
+}
+
+cfs_hash_ops_t ldlm_ns_hash_ops = {
+ .hs_hash = ldlm_res_hop_hash,
+ .hs_key = ldlm_res_hop_key,
+ .hs_keycmp = ldlm_res_hop_keycmp,
+ .hs_keycpy = NULL,
+ .hs_object = ldlm_res_hop_object,
+ .hs_get = ldlm_res_hop_get_locked,
+ .hs_put_locked = ldlm_res_hop_put_locked,
+ .hs_put = ldlm_res_hop_put
+};
+
+cfs_hash_ops_t ldlm_ns_fid_hash_ops = {
+ .hs_hash = ldlm_res_hop_fid_hash,
+ .hs_key = ldlm_res_hop_key,
+ .hs_keycmp = ldlm_res_hop_keycmp,
+ .hs_keycpy = NULL,
+ .hs_object = ldlm_res_hop_object,
+ .hs_get = ldlm_res_hop_get_locked,
+ .hs_put_locked = ldlm_res_hop_put_locked,
+ .hs_put = ldlm_res_hop_put
+};
+
+struct ldlm_ns_hash_def {
+ ldlm_ns_type_t nsd_type;
+ /** hash bucket bits */
+ unsigned nsd_bkt_bits;
+ /** hash bits */
+ unsigned nsd_all_bits;
+ /** hash operations */
+ cfs_hash_ops_t *nsd_hops;
+};
+
+struct ldlm_ns_hash_def ldlm_ns_hash_defs[] = {
+ {
+ .nsd_type = LDLM_NS_TYPE_MDC,
+ .nsd_bkt_bits = 11,
+ .nsd_all_bits = 16,
+ .nsd_hops = &ldlm_ns_fid_hash_ops,
+ },
+ {
+ .nsd_type = LDLM_NS_TYPE_MDT,
+ .nsd_bkt_bits = 14,
+ .nsd_all_bits = 21,
+ .nsd_hops = &ldlm_ns_fid_hash_ops,
+ },
+ {
+ .nsd_type = LDLM_NS_TYPE_OSC,
+ .nsd_bkt_bits = 8,
+ .nsd_all_bits = 12,
+ .nsd_hops = &ldlm_ns_hash_ops,
+ },
+ {
+ .nsd_type = LDLM_NS_TYPE_OST,
+ .nsd_bkt_bits = 11,
+ .nsd_all_bits = 17,
+ .nsd_hops = &ldlm_ns_hash_ops,
+ },
+ {
+ .nsd_type = LDLM_NS_TYPE_MGC,
+ .nsd_bkt_bits = 4,
+ .nsd_all_bits = 4,
+ .nsd_hops = &ldlm_ns_hash_ops,
+ },
+ {
+ .nsd_type = LDLM_NS_TYPE_MGT,
+ .nsd_bkt_bits = 4,
+ .nsd_all_bits = 4,
+ .nsd_hops = &ldlm_ns_hash_ops,
+ },
+ {
+ .nsd_type = LDLM_NS_TYPE_UNKNOWN,
+ },
+};
+
+/**
+ * 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,
+ ldlm_ns_type_t ns_type)
+{
+ struct ldlm_namespace *ns = NULL;
+ struct ldlm_ns_bucket *nsb;
+ struct ldlm_ns_hash_def *nsd;
+ struct cfs_hash_bd bd;
+ int idx;
+ int rc;
+
+ LASSERT(obd != NULL);
+
+ rc = ldlm_get_ref();
+ if (rc) {
+ CERROR("ldlm_get_ref failed: %d\n", rc);
+ return NULL;
+ }
+
+ for (idx = 0;; idx++) {
+ nsd = &ldlm_ns_hash_defs[idx];
+ if (nsd->nsd_type == LDLM_NS_TYPE_UNKNOWN) {
+ CERROR("Unknown type %d for ns %s\n", ns_type, name);
+ goto out_ref;
+ }
+
+ if (nsd->nsd_type == ns_type)
+ break;
+ }
+
+ OBD_ALLOC_PTR(ns);
+ if (!ns)
+ goto out_ref;
+
+ ns->ns_rs_hash = cfs_hash_create(name,
+ nsd->nsd_all_bits, nsd->nsd_all_bits,
+ nsd->nsd_bkt_bits, sizeof(*nsb),
+ CFS_HASH_MIN_THETA,
+ CFS_HASH_MAX_THETA,
+ nsd->nsd_hops,
+ CFS_HASH_DEPTH |
+ CFS_HASH_BIGNAME |
+ CFS_HASH_SPIN_BKTLOCK |
+ CFS_HASH_NO_ITEMREF);
+ if (ns->ns_rs_hash == NULL)
+ goto out_ns;
+
+ cfs_hash_for_each_bucket(ns->ns_rs_hash, &bd, idx) {
+ nsb = cfs_hash_bd_extra_get(ns->ns_rs_hash, &bd);
+ at_init(&nsb->nsb_at_estimate, ldlm_enqueue_min, 0);
+ nsb->nsb_namespace = ns;
+ }
+
+ ns->ns_obd = obd;
+ ns->ns_appetite = apt;
+ ns->ns_client = client;
+
+ INIT_LIST_HEAD(&ns->ns_list_chain);
+ INIT_LIST_HEAD(&ns->ns_unused_list);
+ spin_lock_init(&ns->ns_lock);
+ atomic_set(&ns->ns_bref, 0);
+ init_waitqueue_head(&ns->ns_waitq);
+
+ ns->ns_max_nolock_size = NS_DEFAULT_MAX_NOLOCK_BYTES;
+ ns->ns_contention_time = NS_DEFAULT_CONTENTION_SECONDS;
+ ns->ns_contended_locks = NS_DEFAULT_CONTENDED_LOCKS;
+
+ ns->ns_max_parallel_ast = LDLM_DEFAULT_PARALLEL_AST_LIMIT;
+ ns->ns_nr_unused = 0;
+ ns->ns_max_unused = LDLM_DEFAULT_LRU_SIZE;
+ ns->ns_max_age = LDLM_DEFAULT_MAX_ALIVE;
+ ns->ns_ctime_age_limit = LDLM_CTIME_AGE_LIMIT;
+ ns->ns_timeouts = 0;
+ ns->ns_orig_connect_flags = 0;
+ ns->ns_connect_flags = 0;
+ ns->ns_stopping = 0;
+ rc = ldlm_namespace_proc_register(ns);
+ if (rc != 0) {
+ CERROR("Can't initialize ns proc, rc %d\n", rc);
+ goto out_hash;
+ }
+
+ 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);
+ goto out_proc;
+ }
+
+ ldlm_namespace_register(ns, client);
+ return ns;
+out_proc:
+ ldlm_namespace_proc_unregister(ns);
+ ldlm_namespace_cleanup(ns, 0);
+out_hash:
+ cfs_hash_putref(ns->ns_rs_hash);
+out_ns:
+ OBD_FREE_PTR(ns);
+out_ref:
+ ldlm_put_ref();
+ return NULL;
+}
+EXPORT_SYMBOL(ldlm_namespace_new);
+
+extern struct ldlm_lock *ldlm_lock_get(struct ldlm_lock *lock);
+
+/**
+ * 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, struct list_head *q,
+ __u64 flags)
+{
+ struct list_head *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. */
+ lock_res(res);
+ list_for_each(tmp, q) {
+ lock = list_entry(tmp, struct ldlm_lock,
+ l_res_link);
+ if (lock->l_flags & LDLM_FL_CLEANED) {
+ lock = NULL;
+ continue;
+ }
+ LDLM_LOCK_GET(lock);
+ lock->l_flags |= LDLM_FL_CLEANED;
+ break;
+ }
+
+ if (lock == NULL) {
+ unlock_res(res);
+ break;
+ }
+
+ /* Set CBPENDING so nothing in the cancellation path
+ * can match this lock. */
+ lock->l_flags |= LDLM_FL_CBPENDING;
+ lock->l_flags |= LDLM_FL_FAILED;
+ lock->l_flags |= flags;
+
+ /* ... without sending a CANCEL message for local_only. */
+ if (local_only)
+ lock->l_flags |= LDLM_FL_LOCAL_ONLY;
+
+ if (local_only && (lock->l_readers || lock->l_writers)) {
+ /* This is a little bit gross, but much better than the
+ * alternative: pretend that we got a blocking AST from
+ * the server, so that when the lock is decref'd, it
+ * will go away ... */
+ unlock_res(res);
+ LDLM_DEBUG(lock, "setting FL_LOCAL_ONLY");
+ if (lock->l_completion_ast)
+ lock->l_completion_ast(lock, 0, NULL);
+ LDLM_LOCK_RELEASE(lock);
+ continue;
+ }
+
+ if (client) {
+ struct lustre_handle lockh;
+
+ unlock_res(res);
+ ldlm_lock2handle(lock, &lockh);
+ rc = ldlm_cli_cancel(&lockh, LCF_ASYNC);
+ if (rc)
+ CERROR("ldlm_cli_cancel: %d\n", rc);
+ } else {
+ ldlm_resource_unlink_lock(lock);
+ unlock_res(res);
+ LDLM_DEBUG(lock, "Freeing a lock still held by a client node");
+ ldlm_lock_destroy(lock);
+ }
+ LDLM_LOCK_RELEASE(lock);
+ } while (1);
+}
+
+static int ldlm_resource_clean(struct cfs_hash *hs, struct cfs_hash_bd *bd,
+ struct hlist_node *hnode, void *arg)
+{
+ struct ldlm_resource *res = cfs_hash_object(hs, hnode);
+ __u64 flags = *(__u64 *)arg;
+
+ cleanup_resource(res, &res->lr_granted, flags);
+ cleanup_resource(res, &res->lr_converting, flags);
+ cleanup_resource(res, &res->lr_waiting, flags);
+
+ return 0;
+}
+
+static int ldlm_resource_complain(struct cfs_hash *hs, struct cfs_hash_bd *bd,
+ struct hlist_node *hnode, void *arg)
+{
+ 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,
+ atomic_read(&res->lr_refcount) - 1);
+
+ ldlm_resource_dump(D_ERROR, res);
+ unlock_res(res);
+ return 0;
+}
+
+/**
+ * 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, &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)
+{
+ /* At shutdown time, don't call the cancellation callback */
+ ldlm_namespace_cleanup(ns, force ? LDLM_FL_LOCAL_ONLY : 0);
+
+ if (atomic_read(&ns->ns_bref) > 0) {
+ struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
+ int rc;
+
+ CDEBUG(D_DLMTRACE,
+ "dlm namespace %s free waiting on refcount %d\n",
+ ldlm_ns_name(ns), atomic_read(&ns->ns_bref));
+force_wait:
+ if (force)
+ lwi = LWI_TIMEOUT(obd_timeout * HZ / 4, NULL, NULL);
+
+ rc = l_wait_event(ns->ns_waitq,
+ atomic_read(&ns->ns_bref) == 0, &lwi);
+
+ /* Forced cleanups should be able to reclaim all references,
+ * so it's safe to wait forever... we can't leak locks... */
+ if (force && rc == -ETIMEDOUT) {
+ LCONSOLE_ERROR("Forced cleanup waiting for %s namespace with %d resources in use, (rc=%d)\n",
+ ldlm_ns_name(ns),
+ atomic_read(&ns->ns_bref), rc);
+ goto force_wait;
+ }
+
+ if (atomic_read(&ns->ns_bref)) {
+ LCONSOLE_ERROR("Cleanup waiting for %s namespace with %d resources in use, (rc=%d)\n",
+ ldlm_ns_name(ns),
+ atomic_read(&ns->ns_bref), rc);
+ return ELDLM_NAMESPACE_EXISTS;
+ }
+ CDEBUG(D_DLMTRACE, "dlm namespace %s free done waiting\n",
+ ldlm_ns_name(ns));
+ }
+
+ return ELDLM_OK;
+}
+
+/**
+ * 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;
+ * (1) Clear all locks in \a ns.
+ */
+void ldlm_namespace_free_prior(struct ldlm_namespace *ns,
+ struct obd_import *imp,
+ int force)
+{
+ int rc;
+
+ if (!ns)
+ return;
+
+ 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.
+ */
+ rc = __ldlm_namespace_free(ns, force);
+ if (rc != ELDLM_OK) {
+ if (imp) {
+ ptlrpc_disconnect_import(imp, 0);
+ ptlrpc_invalidate_import(imp);
+ }
+
+ /*
+ * With all requests dropped and the import inactive
+ * we are guaranteed all reference will be dropped.
+ */
+ rc = __ldlm_namespace_free(ns, 1);
+ LASSERT(rc == 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)
+{
+ if (!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 at this time, otherwise
+ * this will cause issues related to using freed \a ns in poold
+ * thread. */
+ LASSERT(list_empty(&ns->ns_list_chain));
+ OBD_FREE_PTR(ns);
+ ldlm_put_ref();
+}
+
+/**
+ * Cleanup the resource, and free namespace.
+ * bug 12864:
+ * Deadlock issue:
+ * proc1: destroy import
+ * class_disconnect_export(grab cl_sem) ->
+ * -> ldlm_namespace_free ->
+ * -> lprocfs_remove(grab _lprocfs_lock).
+ * proc2: read proc info
+ * lprocfs_fops_read(grab _lprocfs_lock) ->
+ * -> osc_rd_active, etc(grab cl_sem).
+ *
+ * So that I have to split the ldlm_namespace_free into two parts - the first
+ * part ldlm_namespace_free_prior is used to cleanup the resource which is
+ * being used; the 2nd part ldlm_namespace_free_post is used to unregister the
+ * lprocfs entries, and then free memory. It will be called w/o cli->cl_sem
+ * held.
+ */
+void ldlm_namespace_free(struct ldlm_namespace *ns,
+ struct obd_import *imp,
+ int force)
+{
+ 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)
+{
+ 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 atomic_inc_return(&ns->ns_bref);
+}
+
+void ldlm_namespace_put(struct ldlm_namespace *ns)
+{
+ if (atomic_dec_and_lock(&ns->ns_bref, &ns->ns_lock)) {
+ wake_up(&ns->ns_waitq);
+ spin_unlock(&ns->ns_lock);
+ }
+}
+EXPORT_SYMBOL(ldlm_namespace_put);
+
+/** Register \a ns in the list of namespaces */
+void ldlm_namespace_register(struct ldlm_namespace *ns, ldlm_side_t client)
+{
+ mutex_lock(ldlm_namespace_lock(client));
+ LASSERT(list_empty(&ns->ns_list_chain));
+ list_add(&ns->ns_list_chain, ldlm_namespace_inactive_list(client));
+ ldlm_namespace_nr_inc(client);
+ mutex_unlock(ldlm_namespace_lock(client));
+}
+
+/** Unregister \a ns from the list of namespaces. */
+void ldlm_namespace_unregister(struct ldlm_namespace *ns, ldlm_side_t client)
+{
+ mutex_lock(ldlm_namespace_lock(client));
+ LASSERT(!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. */
+ 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(!list_empty(&ns->ns_list_chain));
+ LASSERT(mutex_is_locked(ldlm_namespace_lock(client)));
+ list_move_tail(&ns->ns_list_chain, ldlm_namespace_list(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(!list_empty(&ns->ns_list_chain));
+ LASSERT(mutex_is_locked(ldlm_namespace_lock(client)));
+ list_move_tail(&ns->ns_list_chain,
+ ldlm_namespace_inactive_list(client));
+}
+
+/** Should be called with ldlm_namespace_lock(client) taken. */
+struct ldlm_namespace *ldlm_namespace_first_locked(ldlm_side_t client)
+{
+ LASSERT(mutex_is_locked(ldlm_namespace_lock(client)));
+ LASSERT(!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, GFP_NOFS);
+ if (res == NULL)
+ return NULL;
+
+ INIT_LIST_HEAD(&res->lr_granted);
+ INIT_LIST_HEAD(&res->lr_converting);
+ INIT_LIST_HEAD(&res->lr_waiting);
+
+ /* 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;
+ res->lr_itree[idx].lit_root = NULL;
+ }
+
+ atomic_set(&res->lr_refcount, 1);
+ spin_lock_init(&res->lr_lock);
+ lu_ref_init(&res->lr_reference);
+
+ /* 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 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 hlist_node *hnode;
+ struct ldlm_resource *res;
+ struct cfs_hash_bd bd;
+ __u64 version;
+ int ns_refcount = 0;
+
+ LASSERT(ns != NULL);
+ LASSERT(parent == NULL);
+ LASSERT(ns->ns_rs_hash != NULL);
+ LASSERT(name->name[0] != 0);
+
+ cfs_hash_bd_get_and_lock(ns->ns_rs_hash, (void *)name, &bd, 0);
+ hnode = cfs_hash_bd_lookup_locked(ns->ns_rs_hash, &bd, (void *)name);
+ if (hnode != NULL) {
+ cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 0);
+ res = 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;
+ }
+
+ version = cfs_hash_bd_version_get(&bd);
+ cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 0);
+
+ if (create == 0)
+ return NULL;
+
+ LASSERTF(type >= LDLM_MIN_TYPE && type < LDLM_MAX_TYPE,
+ "type: %d\n", type);
+ res = ldlm_resource_new();
+ if (!res)
+ return NULL;
+
+ res->lr_ns_bucket = cfs_hash_bd_extra_get(ns->ns_rs_hash, &bd);
+ res->lr_name = *name;
+ res->lr_type = type;
+ res->lr_most_restr = LCK_NL;
+
+ cfs_hash_bd_lock(ns->ns_rs_hash, &bd, 1);
+ hnode = (version == cfs_hash_bd_version_get(&bd)) ? NULL :
+ cfs_hash_bd_lookup_locked(ns->ns_rs_hash, &bd, (void *)name);
+
+ if (hnode != NULL) {
+ /* 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 = 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)
+ 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) {
+ int rc;
+
+ OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_CREATE_RESOURCE, 2);
+ rc = ns->ns_lvbo->lvbo_init(res);
+ if (rc < 0) {
+ CERROR("%s: lvbo_init failed for resource %#llx:%#llx: 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)
+{
+ LASSERT(res != NULL);
+ LASSERT(res != LP_POISON);
+ atomic_inc(&res->lr_refcount);
+ CDEBUG(D_INFO, "getref res: %p count: %d\n", res,
+ atomic_read(&res->lr_refcount));
+ return res;
+}
+
+static void __ldlm_resource_putref_final(struct cfs_hash_bd *bd,
+ struct ldlm_resource *res)
+{
+ struct ldlm_ns_bucket *nsb = res->lr_ns_bucket;
+
+ if (!list_empty(&res->lr_granted)) {
+ ldlm_resource_dump(D_ERROR, res);
+ LBUG();
+ }
+
+ if (!list_empty(&res->lr_converting)) {
+ ldlm_resource_dump(D_ERROR, res);
+ LBUG();
+ }
+
+ if (!list_empty(&res->lr_waiting)) {
+ ldlm_resource_dump(D_ERROR, res);
+ LBUG();
+ }
+
+ cfs_hash_bd_del_locked(nsb->nsb_namespace->ns_rs_hash,
+ bd, &res->lr_hash);
+ lu_ref_fini(&res->lr_reference);
+ if (cfs_hash_bd_count_get(bd) == 0)
+ ldlm_namespace_put(nsb->nsb_namespace);
+}
+
+/* Returns 1 if the resource was freed, 0 if it remains. */
+int ldlm_resource_putref(struct ldlm_resource *res)
+{
+ struct ldlm_namespace *ns = ldlm_res_to_ns(res);
+ struct cfs_hash_bd bd;
+
+ LASSERT_ATOMIC_GT_LT(&res->lr_refcount, 0, LI_POISON);
+ CDEBUG(D_INFO, "putref res: %p count: %d\n",
+ res, atomic_read(&res->lr_refcount) - 1);
+
+ cfs_hash_bd_get(ns->ns_rs_hash, &res->lr_name, &bd);
+ if (cfs_hash_bd_dec_and_lock(ns->ns_rs_hash, &bd, &res->lr_refcount)) {
+ __ldlm_resource_putref_final(&bd, res);
+ cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 1);
+ if (ns->ns_lvbo && ns->ns_lvbo->lvbo_free)
+ ns->ns_lvbo->lvbo_free(res);
+ OBD_SLAB_FREE(res, ldlm_resource_slab, sizeof(*res));
+ return 1;
+ }
+ 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)
+{
+ struct ldlm_namespace *ns = ldlm_res_to_ns(res);
+
+ LASSERT_ATOMIC_GT_LT(&res->lr_refcount, 0, LI_POISON);
+ CDEBUG(D_INFO, "putref res: %p count: %d\n",
+ res, atomic_read(&res->lr_refcount) - 1);
+
+ if (atomic_dec_and_test(&res->lr_refcount)) {
+ struct cfs_hash_bd bd;
+
+ cfs_hash_bd_get(ldlm_res_to_ns(res)->ns_rs_hash,
+ &res->lr_name, &bd);
+ __ldlm_resource_putref_final(&bd, res);
+ cfs_hash_bd_unlock(ns->ns_rs_hash, &bd, 1);
+ /* NB: ns_rs_hash is created with CFS_HASH_NO_ITEMREF,
+ * so we should never be here while calling cfs_hash_del,
+ * cfs_hash_for_each_nolock is the only case we can get
+ * here, which is safe to release cfs_hash_bd_lock.
+ */
+ if (ns->ns_lvbo && ns->ns_lvbo->lvbo_free)
+ ns->ns_lvbo->lvbo_free(res);
+ OBD_SLAB_FREE(res, ldlm_resource_slab, sizeof(*res));
+
+ cfs_hash_bd_lock(ns->ns_rs_hash, &bd, 1);
+ return 1;
+ }
+ return 0;
+}
+
+/**
+ * Add a lock into a given resource into specified lock list.
+ */
+void ldlm_resource_add_lock(struct ldlm_resource *res, struct list_head *head,
+ struct ldlm_lock *lock)
+{
+ check_res_locked(res);
+
+ LDLM_DEBUG(lock, "About to add this lock:\n");
+
+ 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));
+
+ 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)
+{
+ struct ldlm_resource *res = original->l_resource;
+
+ check_res_locked(res);
+
+ ldlm_resource_dump(D_INFO, res);
+ LDLM_DEBUG(new, "About to insert this lock after %p:\n", original);
+
+ if (new->l_flags & LDLM_FL_DESTROYED) {
+ CDEBUG(D_OTHER, "Lock destroyed, not adding to resource\n");
+ goto out;
+ }
+
+ LASSERT(list_empty(&new->l_res_link));
+
+ list_add(&new->l_res_link, &original->l_res_link);
+ out:;
+}
+
+void ldlm_resource_unlink_lock(struct ldlm_lock *lock)
+{
+ int type = lock->l_resource->lr_type;
+
+ check_res_locked(lock->l_resource);
+ if (type == LDLM_IBITS || type == LDLM_PLAIN)
+ ldlm_unlink_lock_skiplist(lock);
+ else if (type == LDLM_EXTENT)
+ ldlm_extent_unlink_lock(lock);
+ 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_type = res->lr_type;
+ 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)
+{
+ struct list_head *tmp;
+
+ if (!((libcfs_debug | D_ERROR) & level))
+ return;
+
+ mutex_lock(ldlm_namespace_lock(client));
+
+ list_for_each(tmp, ldlm_namespace_list(client)) {
+ struct ldlm_namespace *ns;
+
+ ns = list_entry(tmp, struct ldlm_namespace, ns_list_chain);
+ ldlm_namespace_dump(level, ns);
+ }
+
+ mutex_unlock(ldlm_namespace_lock(client));
+}
+EXPORT_SYMBOL(ldlm_dump_all_namespaces);
+
+static int ldlm_res_hash_dump(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 level = (int)(unsigned long)arg;
+
+ lock_res(res);
+ ldlm_resource_dump(level, res);
+ unlock_res(res);
+
+ 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))
+ return;
+
+ CDEBUG(level, "--- Namespace: %s (rc: %d, side: %s)\n",
+ ldlm_ns_name(ns), atomic_read(&ns->ns_bref),
+ ns_is_client(ns) ? "client" : "server");
+
+ if (time_before(cfs_time_current(), ns->ns_next_dump))
+ return;
+
+ cfs_hash_for_each_nolock(ns->ns_rs_hash,
+ ldlm_res_hash_dump,
+ (void *)(unsigned long)level);
+ 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)
+{
+ struct ldlm_lock *lock;
+ unsigned int granted = 0;
+
+ CLASSERT(RES_NAME_SIZE == 4);
+
+ if (!((libcfs_debug | D_ERROR) & level))
+ return;
+
+ CDEBUG(level, "--- Resource: "DLDLMRES" (%p) refcount = %d\n",
+ PLDLMRES(res), res, atomic_read(&res->lr_refcount));
+
+ if (!list_empty(&res->lr_granted)) {
+ CDEBUG(level, "Granted locks (in reverse order):\n");
+ 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 (!list_empty(&res->lr_converting)) {
+ CDEBUG(level, "Converting locks:\n");
+ list_for_each_entry(lock, &res->lr_converting, l_res_link)
+ LDLM_DEBUG_LIMIT(level, lock, "###");
+ }
+ if (!list_empty(&res->lr_waiting)) {
+ CDEBUG(level, "Waiting locks:\n");
+ list_for_each_entry(lock, &res->lr_waiting, l_res_link)
+ LDLM_DEBUG_LIMIT(level, lock, "###");
+ }
+}
Code Review / kvmfornfv.git / blobdiff