| /* |
| * 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) 2008, 2010, Oracle and/or its affiliates. All rights reserved. |
| * Use is subject to license terms. |
| * |
| * Copyright (c) 2011, 2012, Intel Corporation. |
| */ |
| /* |
| * This file is part of Lustre, http://www.lustre.org/ |
| * Lustre is a trademark of Sun Microsystems, Inc. |
| * |
| * Client Lustre Object. |
| * |
| * Author: Nikita Danilov <nikita.danilov@sun.com> |
| */ |
| |
| /* |
| * Locking. |
| * |
| * i_mutex |
| * PG_locked |
| * ->coh_page_guard |
| * ->coh_lock_guard |
| * ->coh_attr_guard |
| * ->ls_guard |
| */ |
| |
| #define DEBUG_SUBSYSTEM S_CLASS |
| |
| #include <linux/libcfs/libcfs.h> |
| /* class_put_type() */ |
| #include <obd_class.h> |
| #include <obd_support.h> |
| #include <lustre_fid.h> |
| #include <linux/list.h> |
| #include <linux/libcfs/libcfs_hash.h> /* for cfs_hash stuff */ |
| #include <cl_object.h> |
| #include "cl_internal.h" |
| |
| static struct kmem_cache *cl_env_kmem; |
| |
| /** Lock class of cl_object_header::coh_page_guard */ |
| static struct lock_class_key cl_page_guard_class; |
| /** Lock class of cl_object_header::coh_lock_guard */ |
| static struct lock_class_key cl_lock_guard_class; |
| /** Lock class of cl_object_header::coh_attr_guard */ |
| static struct lock_class_key cl_attr_guard_class; |
| |
| extern __u32 lu_context_tags_default; |
| extern __u32 lu_session_tags_default; |
| /** |
| * Initialize cl_object_header. |
| */ |
| int cl_object_header_init(struct cl_object_header *h) |
| { |
| int result; |
| |
| result = lu_object_header_init(&h->coh_lu); |
| if (result == 0) { |
| spin_lock_init(&h->coh_page_guard); |
| spin_lock_init(&h->coh_lock_guard); |
| spin_lock_init(&h->coh_attr_guard); |
| lockdep_set_class(&h->coh_page_guard, &cl_page_guard_class); |
| lockdep_set_class(&h->coh_lock_guard, &cl_lock_guard_class); |
| lockdep_set_class(&h->coh_attr_guard, &cl_attr_guard_class); |
| h->coh_pages = 0; |
| /* XXX hard coded GFP_* mask. */ |
| INIT_RADIX_TREE(&h->coh_tree, GFP_ATOMIC); |
| INIT_LIST_HEAD(&h->coh_locks); |
| h->coh_page_bufsize = ALIGN(sizeof(struct cl_page), 8); |
| } |
| return result; |
| } |
| EXPORT_SYMBOL(cl_object_header_init); |
| |
| /** |
| * Finalize cl_object_header. |
| */ |
| void cl_object_header_fini(struct cl_object_header *h) |
| { |
| LASSERT(list_empty(&h->coh_locks)); |
| lu_object_header_fini(&h->coh_lu); |
| } |
| EXPORT_SYMBOL(cl_object_header_fini); |
| |
| /** |
| * Returns a cl_object with a given \a fid. |
| * |
| * Returns either cached or newly created object. Additional reference on the |
| * returned object is acquired. |
| * |
| * \see lu_object_find(), cl_page_find(), cl_lock_find() |
| */ |
| struct cl_object *cl_object_find(const struct lu_env *env, |
| struct cl_device *cd, const struct lu_fid *fid, |
| const struct cl_object_conf *c) |
| { |
| might_sleep(); |
| return lu2cl(lu_object_find_slice(env, cl2lu_dev(cd), fid, &c->coc_lu)); |
| } |
| EXPORT_SYMBOL(cl_object_find); |
| |
| /** |
| * Releases a reference on \a o. |
| * |
| * When last reference is released object is returned to the cache, unless |
| * lu_object_header_flags::LU_OBJECT_HEARD_BANSHEE bit is set in its header. |
| * |
| * \see cl_page_put(), cl_lock_put(). |
| */ |
| void cl_object_put(const struct lu_env *env, struct cl_object *o) |
| { |
| lu_object_put(env, &o->co_lu); |
| } |
| EXPORT_SYMBOL(cl_object_put); |
| |
| /** |
| * Acquire an additional reference to the object \a o. |
| * |
| * This can only be used to acquire _additional_ reference, i.e., caller |
| * already has to possess at least one reference to \a o before calling this. |
| * |
| * \see cl_page_get(), cl_lock_get(). |
| */ |
| void cl_object_get(struct cl_object *o) |
| { |
| lu_object_get(&o->co_lu); |
| } |
| EXPORT_SYMBOL(cl_object_get); |
| |
| /** |
| * Returns the top-object for a given \a o. |
| * |
| * \see cl_page_top(), cl_io_top() |
| */ |
| struct cl_object *cl_object_top(struct cl_object *o) |
| { |
| struct cl_object_header *hdr = cl_object_header(o); |
| struct cl_object *top; |
| |
| while (hdr->coh_parent != NULL) |
| hdr = hdr->coh_parent; |
| |
| top = lu2cl(lu_object_top(&hdr->coh_lu)); |
| CDEBUG(D_TRACE, "%p -> %p\n", o, top); |
| return top; |
| } |
| EXPORT_SYMBOL(cl_object_top); |
| |
| /** |
| * Returns pointer to the lock protecting data-attributes for the given object |
| * \a o. |
| * |
| * Data-attributes are protected by the cl_object_header::coh_attr_guard |
| * spin-lock in the top-object. |
| * |
| * \see cl_attr, cl_object_attr_lock(), cl_object_operations::coo_attr_get(). |
| */ |
| static spinlock_t *cl_object_attr_guard(struct cl_object *o) |
| { |
| return &cl_object_header(cl_object_top(o))->coh_attr_guard; |
| } |
| |
| /** |
| * Locks data-attributes. |
| * |
| * Prevents data-attributes from changing, until lock is released by |
| * cl_object_attr_unlock(). This has to be called before calls to |
| * cl_object_attr_get(), cl_object_attr_set(). |
| */ |
| void cl_object_attr_lock(struct cl_object *o) |
| { |
| spin_lock(cl_object_attr_guard(o)); |
| } |
| EXPORT_SYMBOL(cl_object_attr_lock); |
| |
| /** |
| * Releases data-attributes lock, acquired by cl_object_attr_lock(). |
| */ |
| void cl_object_attr_unlock(struct cl_object *o) |
| { |
| spin_unlock(cl_object_attr_guard(o)); |
| } |
| EXPORT_SYMBOL(cl_object_attr_unlock); |
| |
| /** |
| * Returns data-attributes of an object \a obj. |
| * |
| * Every layer is asked (by calling cl_object_operations::coo_attr_get()) |
| * top-to-bottom to fill in parts of \a attr that this layer is responsible |
| * for. |
| */ |
| int cl_object_attr_get(const struct lu_env *env, struct cl_object *obj, |
| struct cl_attr *attr) |
| { |
| struct lu_object_header *top; |
| int result; |
| |
| LASSERT(spin_is_locked(cl_object_attr_guard(obj))); |
| |
| top = obj->co_lu.lo_header; |
| result = 0; |
| list_for_each_entry(obj, &top->loh_layers, co_lu.lo_linkage) { |
| if (obj->co_ops->coo_attr_get != NULL) { |
| result = obj->co_ops->coo_attr_get(env, obj, attr); |
| if (result != 0) { |
| if (result > 0) |
| result = 0; |
| break; |
| } |
| } |
| } |
| return result; |
| } |
| EXPORT_SYMBOL(cl_object_attr_get); |
| |
| /** |
| * Updates data-attributes of an object \a obj. |
| * |
| * Only attributes, mentioned in a validness bit-mask \a v are |
| * updated. Calls cl_object_operations::coo_attr_set() on every layer, bottom |
| * to top. |
| */ |
| int cl_object_attr_set(const struct lu_env *env, struct cl_object *obj, |
| const struct cl_attr *attr, unsigned v) |
| { |
| struct lu_object_header *top; |
| int result; |
| |
| LASSERT(spin_is_locked(cl_object_attr_guard(obj))); |
| |
| top = obj->co_lu.lo_header; |
| result = 0; |
| list_for_each_entry_reverse(obj, &top->loh_layers, |
| co_lu.lo_linkage) { |
| if (obj->co_ops->coo_attr_set != NULL) { |
| result = obj->co_ops->coo_attr_set(env, obj, attr, v); |
| if (result != 0) { |
| if (result > 0) |
| result = 0; |
| break; |
| } |
| } |
| } |
| return result; |
| } |
| EXPORT_SYMBOL(cl_object_attr_set); |
| |
| /** |
| * Notifies layers (bottom-to-top) that glimpse AST was received. |
| * |
| * Layers have to fill \a lvb fields with information that will be shipped |
| * back to glimpse issuer. |
| * |
| * \see cl_lock_operations::clo_glimpse() |
| */ |
| int cl_object_glimpse(const struct lu_env *env, struct cl_object *obj, |
| struct ost_lvb *lvb) |
| { |
| struct lu_object_header *top; |
| int result; |
| |
| top = obj->co_lu.lo_header; |
| result = 0; |
| list_for_each_entry_reverse(obj, &top->loh_layers, |
| co_lu.lo_linkage) { |
| if (obj->co_ops->coo_glimpse != NULL) { |
| result = obj->co_ops->coo_glimpse(env, obj, lvb); |
| if (result != 0) |
| break; |
| } |
| } |
| LU_OBJECT_HEADER(D_DLMTRACE, env, lu_object_top(top), |
| "size: "LPU64" mtime: "LPU64" atime: "LPU64" " |
| "ctime: "LPU64" blocks: "LPU64"\n", |
| lvb->lvb_size, lvb->lvb_mtime, lvb->lvb_atime, |
| lvb->lvb_ctime, lvb->lvb_blocks); |
| return result; |
| } |
| EXPORT_SYMBOL(cl_object_glimpse); |
| |
| /** |
| * Updates a configuration of an object \a obj. |
| */ |
| int cl_conf_set(const struct lu_env *env, struct cl_object *obj, |
| const struct cl_object_conf *conf) |
| { |
| struct lu_object_header *top; |
| int result; |
| |
| top = obj->co_lu.lo_header; |
| result = 0; |
| list_for_each_entry(obj, &top->loh_layers, co_lu.lo_linkage) { |
| if (obj->co_ops->coo_conf_set != NULL) { |
| result = obj->co_ops->coo_conf_set(env, obj, conf); |
| if (result != 0) |
| break; |
| } |
| } |
| return result; |
| } |
| EXPORT_SYMBOL(cl_conf_set); |
| |
| /** |
| * Helper function removing all object locks, and marking object for |
| * deletion. All object pages must have been deleted at this point. |
| * |
| * This is called by cl_inode_fini() and lov_object_delete() to destroy top- |
| * and sub- objects respectively. |
| */ |
| void cl_object_kill(const struct lu_env *env, struct cl_object *obj) |
| { |
| struct cl_object_header *hdr; |
| |
| hdr = cl_object_header(obj); |
| LASSERT(hdr->coh_tree.rnode == NULL); |
| LASSERT(hdr->coh_pages == 0); |
| |
| set_bit(LU_OBJECT_HEARD_BANSHEE, &hdr->coh_lu.loh_flags); |
| /* |
| * Destroy all locks. Object destruction (including cl_inode_fini()) |
| * cannot cancel the locks, because in the case of a local client, |
| * where client and server share the same thread running |
| * prune_icache(), this can dead-lock with ldlm_cancel_handler() |
| * waiting on __wait_on_freeing_inode(). |
| */ |
| cl_locks_prune(env, obj, 0); |
| } |
| EXPORT_SYMBOL(cl_object_kill); |
| |
| /** |
| * Prunes caches of pages and locks for this object. |
| */ |
| void cl_object_prune(const struct lu_env *env, struct cl_object *obj) |
| { |
| cl_pages_prune(env, obj); |
| cl_locks_prune(env, obj, 1); |
| } |
| EXPORT_SYMBOL(cl_object_prune); |
| |
| /** |
| * Check if the object has locks. |
| */ |
| int cl_object_has_locks(struct cl_object *obj) |
| { |
| struct cl_object_header *head = cl_object_header(obj); |
| int has; |
| |
| spin_lock(&head->coh_lock_guard); |
| has = list_empty(&head->coh_locks); |
| spin_unlock(&head->coh_lock_guard); |
| |
| return (has == 0); |
| } |
| EXPORT_SYMBOL(cl_object_has_locks); |
| |
| void cache_stats_init(struct cache_stats *cs, const char *name) |
| { |
| int i; |
| |
| cs->cs_name = name; |
| for (i = 0; i < CS_NR; i++) |
| atomic_set(&cs->cs_stats[i], 0); |
| } |
| |
| int cache_stats_print(const struct cache_stats *cs, struct seq_file *m, int h) |
| { |
| int i; |
| /* |
| * lookup hit total cached create |
| * env: ...... ...... ...... ...... ...... |
| */ |
| if (h) { |
| const char *names[CS_NR] = CS_NAMES; |
| |
| seq_printf(m, "%6s", " "); |
| for (i = 0; i < CS_NR; i++) |
| seq_printf(m, "%8s", names[i]); |
| seq_printf(m, "\n"); |
| } |
| |
| seq_printf(m, "%5.5s:", cs->cs_name); |
| for (i = 0; i < CS_NR; i++) |
| seq_printf(m, "%8u", atomic_read(&cs->cs_stats[i])); |
| return 0; |
| } |
| |
| /** |
| * Initialize client site. |
| * |
| * Perform common initialization (lu_site_init()), and initialize statistical |
| * counters. Also perform global initializations on the first call. |
| */ |
| int cl_site_init(struct cl_site *s, struct cl_device *d) |
| { |
| int i; |
| int result; |
| |
| result = lu_site_init(&s->cs_lu, &d->cd_lu_dev); |
| if (result == 0) { |
| cache_stats_init(&s->cs_pages, "pages"); |
| cache_stats_init(&s->cs_locks, "locks"); |
| for (i = 0; i < ARRAY_SIZE(s->cs_pages_state); ++i) |
| atomic_set(&s->cs_pages_state[0], 0); |
| for (i = 0; i < ARRAY_SIZE(s->cs_locks_state); ++i) |
| atomic_set(&s->cs_locks_state[i], 0); |
| } |
| return result; |
| } |
| EXPORT_SYMBOL(cl_site_init); |
| |
| /** |
| * Finalize client site. Dual to cl_site_init(). |
| */ |
| void cl_site_fini(struct cl_site *s) |
| { |
| lu_site_fini(&s->cs_lu); |
| } |
| EXPORT_SYMBOL(cl_site_fini); |
| |
| static struct cache_stats cl_env_stats = { |
| .cs_name = "envs", |
| .cs_stats = { ATOMIC_INIT(0), } |
| }; |
| |
| /** |
| * Outputs client site statistical counters into a buffer. Suitable for |
| * ll_rd_*()-style functions. |
| */ |
| int cl_site_stats_print(const struct cl_site *site, struct seq_file *m) |
| { |
| int i; |
| static const char *pstate[] = { |
| [CPS_CACHED] = "c", |
| [CPS_OWNED] = "o", |
| [CPS_PAGEOUT] = "w", |
| [CPS_PAGEIN] = "r", |
| [CPS_FREEING] = "f" |
| }; |
| static const char *lstate[] = { |
| [CLS_NEW] = "n", |
| [CLS_QUEUING] = "q", |
| [CLS_ENQUEUED] = "e", |
| [CLS_HELD] = "h", |
| [CLS_INTRANSIT] = "t", |
| [CLS_CACHED] = "c", |
| [CLS_FREEING] = "f" |
| }; |
| /* |
| lookup hit total busy create |
| pages: ...... ...... ...... ...... ...... [...... ...... ...... ......] |
| locks: ...... ...... ...... ...... ...... [...... ...... ...... ...... ......] |
| env: ...... ...... ...... ...... ...... |
| */ |
| lu_site_stats_print(&site->cs_lu, m); |
| cache_stats_print(&site->cs_pages, m, 1); |
| seq_printf(m, " ["); |
| for (i = 0; i < ARRAY_SIZE(site->cs_pages_state); ++i) |
| seq_printf(m, "%s: %u ", pstate[i], |
| atomic_read(&site->cs_pages_state[i])); |
| seq_printf(m, "]\n"); |
| cache_stats_print(&site->cs_locks, m, 0); |
| seq_printf(m, " ["); |
| for (i = 0; i < ARRAY_SIZE(site->cs_locks_state); ++i) |
| seq_printf(m, "%s: %u ", lstate[i], |
| atomic_read(&site->cs_locks_state[i])); |
| seq_printf(m, "]\n"); |
| cache_stats_print(&cl_env_stats, m, 0); |
| seq_printf(m, "\n"); |
| return 0; |
| } |
| EXPORT_SYMBOL(cl_site_stats_print); |
| |
| /***************************************************************************** |
| * |
| * lu_env handling on client. |
| * |
| */ |
| |
| /** |
| * The most efficient way is to store cl_env pointer in task specific |
| * structures. On Linux, it wont' be easy to use task_struct->journal_info |
| * because Lustre code may call into other fs which has certain assumptions |
| * about journal_info. Currently following fields in task_struct are identified |
| * can be used for this purpose: |
| * - cl_env: for liblustre. |
| * - tux_info: ony on RedHat kernel. |
| * - ... |
| * \note As long as we use task_struct to store cl_env, we assume that once |
| * called into Lustre, we'll never call into the other part of the kernel |
| * which will use those fields in task_struct without explicitly exiting |
| * Lustre. |
| * |
| * If there's no space in task_struct is available, hash will be used. |
| * bz20044, bz22683. |
| */ |
| |
| struct cl_env { |
| void *ce_magic; |
| struct lu_env ce_lu; |
| struct lu_context ce_ses; |
| |
| /** |
| * This allows cl_env to be entered into cl_env_hash which implements |
| * the current thread -> client environment lookup. |
| */ |
| struct hlist_node ce_node; |
| /** |
| * Owner for the current cl_env. |
| * |
| * If LL_TASK_CL_ENV is defined, this point to the owning current, |
| * only for debugging purpose ; |
| * Otherwise hash is used, and this is the key for cfs_hash. |
| * Now current thread pid is stored. Note using thread pointer would |
| * lead to unbalanced hash because of its specific allocation locality |
| * and could be varied for different platforms and OSes, even different |
| * OS versions. |
| */ |
| void *ce_owner; |
| |
| /* |
| * Linkage into global list of all client environments. Used for |
| * garbage collection. |
| */ |
| struct list_head ce_linkage; |
| /* |
| * |
| */ |
| int ce_ref; |
| /* |
| * Debugging field: address of the caller who made original |
| * allocation. |
| */ |
| void *ce_debug; |
| }; |
| |
| #define CL_ENV_INC(counter) |
| #define CL_ENV_DEC(counter) |
| |
| static void cl_env_init0(struct cl_env *cle, void *debug) |
| { |
| LASSERT(cle->ce_ref == 0); |
| LASSERT(cle->ce_magic == &cl_env_init0); |
| LASSERT(cle->ce_debug == NULL && cle->ce_owner == NULL); |
| |
| cle->ce_ref = 1; |
| cle->ce_debug = debug; |
| CL_ENV_INC(busy); |
| } |
| |
| |
| /* |
| * The implementation of using hash table to connect cl_env and thread |
| */ |
| |
| static struct cfs_hash *cl_env_hash; |
| |
| static unsigned cl_env_hops_hash(struct cfs_hash *lh, |
| const void *key, unsigned mask) |
| { |
| #if BITS_PER_LONG == 64 |
| return cfs_hash_u64_hash((__u64)key, mask); |
| #else |
| return cfs_hash_u32_hash((__u32)key, mask); |
| #endif |
| } |
| |
| static void *cl_env_hops_obj(struct hlist_node *hn) |
| { |
| struct cl_env *cle = hlist_entry(hn, struct cl_env, ce_node); |
| LASSERT(cle->ce_magic == &cl_env_init0); |
| return (void *)cle; |
| } |
| |
| static int cl_env_hops_keycmp(const void *key, struct hlist_node *hn) |
| { |
| struct cl_env *cle = cl_env_hops_obj(hn); |
| |
| LASSERT(cle->ce_owner != NULL); |
| return (key == cle->ce_owner); |
| } |
| |
| static void cl_env_hops_noop(struct cfs_hash *hs, struct hlist_node *hn) |
| { |
| struct cl_env *cle = hlist_entry(hn, struct cl_env, ce_node); |
| LASSERT(cle->ce_magic == &cl_env_init0); |
| } |
| |
| static cfs_hash_ops_t cl_env_hops = { |
| .hs_hash = cl_env_hops_hash, |
| .hs_key = cl_env_hops_obj, |
| .hs_keycmp = cl_env_hops_keycmp, |
| .hs_object = cl_env_hops_obj, |
| .hs_get = cl_env_hops_noop, |
| .hs_put_locked = cl_env_hops_noop, |
| }; |
| |
| static inline struct cl_env *cl_env_fetch(void) |
| { |
| struct cl_env *cle; |
| |
| cle = cfs_hash_lookup(cl_env_hash, (void *) (long) current->pid); |
| LASSERT(ergo(cle, cle->ce_magic == &cl_env_init0)); |
| return cle; |
| } |
| |
| static inline void cl_env_attach(struct cl_env *cle) |
| { |
| if (cle) { |
| int rc; |
| |
| LASSERT(cle->ce_owner == NULL); |
| cle->ce_owner = (void *) (long) current->pid; |
| rc = cfs_hash_add_unique(cl_env_hash, cle->ce_owner, |
| &cle->ce_node); |
| LASSERT(rc == 0); |
| } |
| } |
| |
| static inline void cl_env_do_detach(struct cl_env *cle) |
| { |
| void *cookie; |
| |
| LASSERT(cle->ce_owner == (void *) (long) current->pid); |
| cookie = cfs_hash_del(cl_env_hash, cle->ce_owner, |
| &cle->ce_node); |
| LASSERT(cookie == cle); |
| cle->ce_owner = NULL; |
| } |
| |
| static int cl_env_store_init(void) { |
| cl_env_hash = cfs_hash_create("cl_env", |
| HASH_CL_ENV_BITS, HASH_CL_ENV_BITS, |
| HASH_CL_ENV_BKT_BITS, 0, |
| CFS_HASH_MIN_THETA, |
| CFS_HASH_MAX_THETA, |
| &cl_env_hops, |
| CFS_HASH_RW_BKTLOCK); |
| return cl_env_hash != NULL ? 0 :-ENOMEM; |
| } |
| |
| static void cl_env_store_fini(void) { |
| cfs_hash_putref(cl_env_hash); |
| } |
| |
| |
| static inline struct cl_env *cl_env_detach(struct cl_env *cle) |
| { |
| if (cle == NULL) |
| cle = cl_env_fetch(); |
| |
| if (cle && cle->ce_owner) |
| cl_env_do_detach(cle); |
| |
| return cle; |
| } |
| |
| static struct lu_env *cl_env_new(__u32 ctx_tags, __u32 ses_tags, void *debug) |
| { |
| struct lu_env *env; |
| struct cl_env *cle; |
| |
| OBD_SLAB_ALLOC_PTR_GFP(cle, cl_env_kmem, __GFP_IO); |
| if (cle != NULL) { |
| int rc; |
| |
| INIT_LIST_HEAD(&cle->ce_linkage); |
| cle->ce_magic = &cl_env_init0; |
| env = &cle->ce_lu; |
| rc = lu_env_init(env, LCT_CL_THREAD|ctx_tags); |
| if (rc == 0) { |
| rc = lu_context_init(&cle->ce_ses, |
| LCT_SESSION | ses_tags); |
| if (rc == 0) { |
| lu_context_enter(&cle->ce_ses); |
| env->le_ses = &cle->ce_ses; |
| cl_env_init0(cle, debug); |
| } else |
| lu_env_fini(env); |
| } |
| if (rc != 0) { |
| OBD_SLAB_FREE_PTR(cle, cl_env_kmem); |
| env = ERR_PTR(rc); |
| } else { |
| CL_ENV_INC(create); |
| CL_ENV_INC(total); |
| } |
| } else |
| env = ERR_PTR(-ENOMEM); |
| return env; |
| } |
| |
| static void cl_env_fini(struct cl_env *cle) |
| { |
| CL_ENV_DEC(total); |
| lu_context_fini(&cle->ce_lu.le_ctx); |
| lu_context_fini(&cle->ce_ses); |
| OBD_SLAB_FREE_PTR(cle, cl_env_kmem); |
| } |
| |
| static inline struct cl_env *cl_env_container(struct lu_env *env) |
| { |
| return container_of(env, struct cl_env, ce_lu); |
| } |
| |
| struct lu_env *cl_env_peek(int *refcheck) |
| { |
| struct lu_env *env; |
| struct cl_env *cle; |
| |
| CL_ENV_INC(lookup); |
| |
| /* check that we don't go far from untrusted pointer */ |
| CLASSERT(offsetof(struct cl_env, ce_magic) == 0); |
| |
| env = NULL; |
| cle = cl_env_fetch(); |
| if (cle != NULL) { |
| CL_ENV_INC(hit); |
| env = &cle->ce_lu; |
| *refcheck = ++cle->ce_ref; |
| } |
| CDEBUG(D_OTHER, "%d@%p\n", cle ? cle->ce_ref : 0, cle); |
| return env; |
| } |
| EXPORT_SYMBOL(cl_env_peek); |
| |
| /** |
| * Returns lu_env: if there already is an environment associated with the |
| * current thread, it is returned, otherwise, new environment is allocated. |
| * |
| * \param refcheck pointer to a counter used to detect environment leaks. In |
| * the usual case cl_env_get() and cl_env_put() are called in the same lexical |
| * scope and pointer to the same integer is passed as \a refcheck. This is |
| * used to detect missed cl_env_put(). |
| * |
| * \see cl_env_put() |
| */ |
| struct lu_env *cl_env_get(int *refcheck) |
| { |
| struct lu_env *env; |
| |
| env = cl_env_peek(refcheck); |
| if (env == NULL) { |
| env = cl_env_new(lu_context_tags_default, |
| lu_session_tags_default, |
| __builtin_return_address(0)); |
| |
| if (!IS_ERR(env)) { |
| struct cl_env *cle; |
| |
| cle = cl_env_container(env); |
| cl_env_attach(cle); |
| *refcheck = cle->ce_ref; |
| CDEBUG(D_OTHER, "%d@%p\n", cle->ce_ref, cle); |
| } |
| } |
| return env; |
| } |
| EXPORT_SYMBOL(cl_env_get); |
| |
| /** |
| * Forces an allocation of a fresh environment with given tags. |
| * |
| * \see cl_env_get() |
| */ |
| struct lu_env *cl_env_alloc(int *refcheck, __u32 tags) |
| { |
| struct lu_env *env; |
| |
| LASSERT(cl_env_peek(refcheck) == NULL); |
| env = cl_env_new(tags, tags, __builtin_return_address(0)); |
| if (!IS_ERR(env)) { |
| struct cl_env *cle; |
| |
| cle = cl_env_container(env); |
| *refcheck = cle->ce_ref; |
| CDEBUG(D_OTHER, "%d@%p\n", cle->ce_ref, cle); |
| } |
| return env; |
| } |
| EXPORT_SYMBOL(cl_env_alloc); |
| |
| static void cl_env_exit(struct cl_env *cle) |
| { |
| LASSERT(cle->ce_owner == NULL); |
| lu_context_exit(&cle->ce_lu.le_ctx); |
| lu_context_exit(&cle->ce_ses); |
| } |
| |
| /** |
| * Release an environment. |
| * |
| * Decrement \a env reference counter. When counter drops to 0, nothing in |
| * this thread is using environment and it is returned to the allocation |
| * cache, or freed straight away, if cache is large enough. |
| */ |
| void cl_env_put(struct lu_env *env, int *refcheck) |
| { |
| struct cl_env *cle; |
| |
| cle = cl_env_container(env); |
| |
| LASSERT(cle->ce_ref > 0); |
| LASSERT(ergo(refcheck != NULL, cle->ce_ref == *refcheck)); |
| |
| CDEBUG(D_OTHER, "%d@%p\n", cle->ce_ref, cle); |
| if (--cle->ce_ref == 0) { |
| CL_ENV_DEC(busy); |
| cl_env_detach(cle); |
| cle->ce_debug = NULL; |
| cl_env_exit(cle); |
| cl_env_fini(cle); |
| } |
| } |
| EXPORT_SYMBOL(cl_env_put); |
| |
| /** |
| * Declares a point of re-entrancy. |
| * |
| * \see cl_env_reexit() |
| */ |
| void *cl_env_reenter(void) |
| { |
| return cl_env_detach(NULL); |
| } |
| EXPORT_SYMBOL(cl_env_reenter); |
| |
| /** |
| * Exits re-entrancy. |
| */ |
| void cl_env_reexit(void *cookie) |
| { |
| cl_env_detach(NULL); |
| cl_env_attach(cookie); |
| } |
| EXPORT_SYMBOL(cl_env_reexit); |
| |
| /** |
| * Setup user-supplied \a env as a current environment. This is to be used to |
| * guaranteed that environment exists even when cl_env_get() fails. It is up |
| * to user to ensure proper concurrency control. |
| * |
| * \see cl_env_unplant() |
| */ |
| void cl_env_implant(struct lu_env *env, int *refcheck) |
| { |
| struct cl_env *cle = cl_env_container(env); |
| |
| LASSERT(cle->ce_ref > 0); |
| |
| cl_env_attach(cle); |
| cl_env_get(refcheck); |
| CDEBUG(D_OTHER, "%d@%p\n", cle->ce_ref, cle); |
| } |
| EXPORT_SYMBOL(cl_env_implant); |
| |
| /** |
| * Detach environment installed earlier by cl_env_implant(). |
| */ |
| void cl_env_unplant(struct lu_env *env, int *refcheck) |
| { |
| struct cl_env *cle = cl_env_container(env); |
| |
| LASSERT(cle->ce_ref > 1); |
| |
| CDEBUG(D_OTHER, "%d@%p\n", cle->ce_ref, cle); |
| |
| cl_env_detach(cle); |
| cl_env_put(env, refcheck); |
| } |
| EXPORT_SYMBOL(cl_env_unplant); |
| |
| struct lu_env *cl_env_nested_get(struct cl_env_nest *nest) |
| { |
| struct lu_env *env; |
| |
| nest->cen_cookie = NULL; |
| env = cl_env_peek(&nest->cen_refcheck); |
| if (env != NULL) { |
| if (!cl_io_is_going(env)) |
| return env; |
| else { |
| cl_env_put(env, &nest->cen_refcheck); |
| nest->cen_cookie = cl_env_reenter(); |
| } |
| } |
| env = cl_env_get(&nest->cen_refcheck); |
| if (IS_ERR(env)) { |
| cl_env_reexit(nest->cen_cookie); |
| return env; |
| } |
| |
| LASSERT(!cl_io_is_going(env)); |
| return env; |
| } |
| EXPORT_SYMBOL(cl_env_nested_get); |
| |
| void cl_env_nested_put(struct cl_env_nest *nest, struct lu_env *env) |
| { |
| cl_env_put(env, &nest->cen_refcheck); |
| cl_env_reexit(nest->cen_cookie); |
| } |
| EXPORT_SYMBOL(cl_env_nested_put); |
| |
| /** |
| * Converts struct cl_attr to struct ost_lvb. |
| * |
| * \see cl_lvb2attr |
| */ |
| void cl_attr2lvb(struct ost_lvb *lvb, const struct cl_attr *attr) |
| { |
| lvb->lvb_size = attr->cat_size; |
| lvb->lvb_mtime = attr->cat_mtime; |
| lvb->lvb_atime = attr->cat_atime; |
| lvb->lvb_ctime = attr->cat_ctime; |
| lvb->lvb_blocks = attr->cat_blocks; |
| } |
| EXPORT_SYMBOL(cl_attr2lvb); |
| |
| /** |
| * Converts struct ost_lvb to struct cl_attr. |
| * |
| * \see cl_attr2lvb |
| */ |
| void cl_lvb2attr(struct cl_attr *attr, const struct ost_lvb *lvb) |
| { |
| attr->cat_size = lvb->lvb_size; |
| attr->cat_mtime = lvb->lvb_mtime; |
| attr->cat_atime = lvb->lvb_atime; |
| attr->cat_ctime = lvb->lvb_ctime; |
| attr->cat_blocks = lvb->lvb_blocks; |
| } |
| EXPORT_SYMBOL(cl_lvb2attr); |
| |
| /***************************************************************************** |
| * |
| * Temporary prototype thing: mirror obd-devices into cl devices. |
| * |
| */ |
| |
| struct cl_device *cl_type_setup(const struct lu_env *env, struct lu_site *site, |
| struct lu_device_type *ldt, |
| struct lu_device *next) |
| { |
| const char *typename; |
| struct lu_device *d; |
| |
| LASSERT(ldt != NULL); |
| |
| typename = ldt->ldt_name; |
| d = ldt->ldt_ops->ldto_device_alloc(env, ldt, NULL); |
| if (!IS_ERR(d)) { |
| int rc; |
| |
| if (site != NULL) |
| d->ld_site = site; |
| rc = ldt->ldt_ops->ldto_device_init(env, d, typename, next); |
| if (rc == 0) { |
| lu_device_get(d); |
| lu_ref_add(&d->ld_reference, |
| "lu-stack", &lu_site_init); |
| } else { |
| ldt->ldt_ops->ldto_device_free(env, d); |
| CERROR("can't init device '%s', %d\n", typename, rc); |
| d = ERR_PTR(rc); |
| } |
| } else |
| CERROR("Cannot allocate device: '%s'\n", typename); |
| return lu2cl_dev(d); |
| } |
| EXPORT_SYMBOL(cl_type_setup); |
| |
| /** |
| * Finalize device stack by calling lu_stack_fini(). |
| */ |
| void cl_stack_fini(const struct lu_env *env, struct cl_device *cl) |
| { |
| lu_stack_fini(env, cl2lu_dev(cl)); |
| } |
| EXPORT_SYMBOL(cl_stack_fini); |
| |
| int cl_lock_init(void); |
| void cl_lock_fini(void); |
| |
| int cl_page_init(void); |
| void cl_page_fini(void); |
| |
| static struct lu_context_key cl_key; |
| |
| struct cl_thread_info *cl_env_info(const struct lu_env *env) |
| { |
| return lu_context_key_get(&env->le_ctx, &cl_key); |
| } |
| |
| /* defines cl0_key_{init,fini}() */ |
| LU_KEY_INIT_FINI(cl0, struct cl_thread_info); |
| |
| static void *cl_key_init(const struct lu_context *ctx, |
| struct lu_context_key *key) |
| { |
| struct cl_thread_info *info; |
| |
| info = cl0_key_init(ctx, key); |
| if (!IS_ERR(info)) { |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(info->clt_counters); ++i) |
| lu_ref_init(&info->clt_counters[i].ctc_locks_locked); |
| } |
| return info; |
| } |
| |
| static void cl_key_fini(const struct lu_context *ctx, |
| struct lu_context_key *key, void *data) |
| { |
| struct cl_thread_info *info; |
| int i; |
| |
| info = data; |
| for (i = 0; i < ARRAY_SIZE(info->clt_counters); ++i) |
| lu_ref_fini(&info->clt_counters[i].ctc_locks_locked); |
| cl0_key_fini(ctx, key, data); |
| } |
| |
| static void cl_key_exit(const struct lu_context *ctx, |
| struct lu_context_key *key, void *data) |
| { |
| struct cl_thread_info *info = data; |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(info->clt_counters); ++i) { |
| LASSERT(info->clt_counters[i].ctc_nr_held == 0); |
| LASSERT(info->clt_counters[i].ctc_nr_used == 0); |
| LASSERT(info->clt_counters[i].ctc_nr_locks_acquired == 0); |
| LASSERT(info->clt_counters[i].ctc_nr_locks_locked == 0); |
| lu_ref_fini(&info->clt_counters[i].ctc_locks_locked); |
| lu_ref_init(&info->clt_counters[i].ctc_locks_locked); |
| } |
| } |
| |
| static struct lu_context_key cl_key = { |
| .lct_tags = LCT_CL_THREAD, |
| .lct_init = cl_key_init, |
| .lct_fini = cl_key_fini, |
| .lct_exit = cl_key_exit |
| }; |
| |
| static struct lu_kmem_descr cl_object_caches[] = { |
| { |
| .ckd_cache = &cl_env_kmem, |
| .ckd_name = "cl_env_kmem", |
| .ckd_size = sizeof (struct cl_env) |
| }, |
| { |
| .ckd_cache = NULL |
| } |
| }; |
| |
| /** |
| * Global initialization of cl-data. Create kmem caches, register |
| * lu_context_key's, etc. |
| * |
| * \see cl_global_fini() |
| */ |
| int cl_global_init(void) |
| { |
| int result; |
| |
| result = cl_env_store_init(); |
| if (result) |
| return result; |
| |
| result = lu_kmem_init(cl_object_caches); |
| if (result) |
| goto out_store; |
| |
| LU_CONTEXT_KEY_INIT(&cl_key); |
| result = lu_context_key_register(&cl_key); |
| if (result) |
| goto out_kmem; |
| |
| result = cl_lock_init(); |
| if (result) |
| goto out_context; |
| |
| result = cl_page_init(); |
| if (result) |
| goto out_lock; |
| |
| return 0; |
| out_lock: |
| cl_lock_fini(); |
| out_context: |
| lu_context_key_degister(&cl_key); |
| out_kmem: |
| lu_kmem_fini(cl_object_caches); |
| out_store: |
| cl_env_store_fini(); |
| return result; |
| } |
| |
| /** |
| * Finalization of global cl-data. Dual to cl_global_init(). |
| */ |
| void cl_global_fini(void) |
| { |
| cl_lock_fini(); |
| cl_page_fini(); |
| lu_context_key_degister(&cl_key); |
| lu_kmem_fini(cl_object_caches); |
| cl_env_store_fini(); |
| } |