4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2011, 2015, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * Client Lustre Object.
34 * Author: Nikita Danilov <nikita.danilov@sun.com>
35 * Author: Jinshan Xiong <jinshan.xiong@intel.com>
47 #define DEBUG_SUBSYSTEM S_CLASS
49 #include "../../include/linux/libcfs/libcfs.h"
50 /* class_put_type() */
51 #include "../include/obd_class.h"
52 #include "../include/obd_support.h"
53 #include "../include/lustre_fid.h"
54 #include <linux/list.h>
55 #include "../../include/linux/libcfs/libcfs_hash.h" /* for cfs_hash stuff */
56 #include "../include/cl_object.h"
57 #include "cl_internal.h"
59 static struct kmem_cache *cl_env_kmem;
61 /** Lock class of cl_object_header::coh_attr_guard */
62 static struct lock_class_key cl_attr_guard_class;
64 extern __u32 lu_context_tags_default;
65 extern __u32 lu_session_tags_default;
67 * Initialize cl_object_header.
69 int cl_object_header_init(struct cl_object_header *h)
73 result = lu_object_header_init(&h->coh_lu);
75 spin_lock_init(&h->coh_attr_guard);
76 lockdep_set_class(&h->coh_attr_guard, &cl_attr_guard_class);
77 h->coh_page_bufsize = 0;
81 EXPORT_SYMBOL(cl_object_header_init);
84 * Returns a cl_object with a given \a fid.
86 * Returns either cached or newly created object. Additional reference on the
87 * returned object is acquired.
89 * \see lu_object_find(), cl_page_find(), cl_lock_find()
91 struct cl_object *cl_object_find(const struct lu_env *env,
92 struct cl_device *cd, const struct lu_fid *fid,
93 const struct cl_object_conf *c)
96 return lu2cl(lu_object_find_slice(env, cl2lu_dev(cd), fid, &c->coc_lu));
98 EXPORT_SYMBOL(cl_object_find);
101 * Releases a reference on \a o.
103 * When last reference is released object is returned to the cache, unless
104 * lu_object_header_flags::LU_OBJECT_HEARD_BANSHEE bit is set in its header.
106 * \see cl_page_put(), cl_lock_put().
108 void cl_object_put(const struct lu_env *env, struct cl_object *o)
110 lu_object_put(env, &o->co_lu);
112 EXPORT_SYMBOL(cl_object_put);
115 * Acquire an additional reference to the object \a o.
117 * This can only be used to acquire _additional_ reference, i.e., caller
118 * already has to possess at least one reference to \a o before calling this.
120 * \see cl_page_get(), cl_lock_get().
122 void cl_object_get(struct cl_object *o)
124 lu_object_get(&o->co_lu);
126 EXPORT_SYMBOL(cl_object_get);
129 * Returns the top-object for a given \a o.
133 struct cl_object *cl_object_top(struct cl_object *o)
135 struct cl_object_header *hdr = cl_object_header(o);
136 struct cl_object *top;
138 while (hdr->coh_parent)
139 hdr = hdr->coh_parent;
141 top = lu2cl(lu_object_top(&hdr->coh_lu));
142 CDEBUG(D_TRACE, "%p -> %p\n", o, top);
145 EXPORT_SYMBOL(cl_object_top);
148 * Returns pointer to the lock protecting data-attributes for the given object
151 * Data-attributes are protected by the cl_object_header::coh_attr_guard
152 * spin-lock in the top-object.
154 * \see cl_attr, cl_object_attr_lock(), cl_object_operations::coo_attr_get().
156 static spinlock_t *cl_object_attr_guard(struct cl_object *o)
158 return &cl_object_header(cl_object_top(o))->coh_attr_guard;
162 * Locks data-attributes.
164 * Prevents data-attributes from changing, until lock is released by
165 * cl_object_attr_unlock(). This has to be called before calls to
166 * cl_object_attr_get(), cl_object_attr_update().
168 void cl_object_attr_lock(struct cl_object *o)
169 __acquires(cl_object_attr_guard(o))
171 spin_lock(cl_object_attr_guard(o));
173 EXPORT_SYMBOL(cl_object_attr_lock);
176 * Releases data-attributes lock, acquired by cl_object_attr_lock().
178 void cl_object_attr_unlock(struct cl_object *o)
179 __releases(cl_object_attr_guard(o))
181 spin_unlock(cl_object_attr_guard(o));
183 EXPORT_SYMBOL(cl_object_attr_unlock);
186 * Returns data-attributes of an object \a obj.
188 * Every layer is asked (by calling cl_object_operations::coo_attr_get())
189 * top-to-bottom to fill in parts of \a attr that this layer is responsible
192 int cl_object_attr_get(const struct lu_env *env, struct cl_object *obj,
193 struct cl_attr *attr)
195 struct lu_object_header *top;
198 assert_spin_locked(cl_object_attr_guard(obj));
200 top = obj->co_lu.lo_header;
202 list_for_each_entry(obj, &top->loh_layers, co_lu.lo_linkage) {
203 if (obj->co_ops->coo_attr_get) {
204 result = obj->co_ops->coo_attr_get(env, obj, attr);
214 EXPORT_SYMBOL(cl_object_attr_get);
217 * Updates data-attributes of an object \a obj.
219 * Only attributes, mentioned in a validness bit-mask \a v are
220 * updated. Calls cl_object_operations::coo_attr_update() on every layer,
223 int cl_object_attr_update(const struct lu_env *env, struct cl_object *obj,
224 const struct cl_attr *attr, unsigned int v)
226 struct lu_object_header *top;
229 assert_spin_locked(cl_object_attr_guard(obj));
231 top = obj->co_lu.lo_header;
233 list_for_each_entry_reverse(obj, &top->loh_layers, co_lu.lo_linkage) {
234 if (obj->co_ops->coo_attr_update) {
235 result = obj->co_ops->coo_attr_update(env, obj, attr,
246 EXPORT_SYMBOL(cl_object_attr_update);
249 * Notifies layers (bottom-to-top) that glimpse AST was received.
251 * Layers have to fill \a lvb fields with information that will be shipped
252 * back to glimpse issuer.
254 * \see cl_lock_operations::clo_glimpse()
256 int cl_object_glimpse(const struct lu_env *env, struct cl_object *obj,
259 struct lu_object_header *top;
262 top = obj->co_lu.lo_header;
264 list_for_each_entry_reverse(obj, &top->loh_layers, co_lu.lo_linkage) {
265 if (obj->co_ops->coo_glimpse) {
266 result = obj->co_ops->coo_glimpse(env, obj, lvb);
271 LU_OBJECT_HEADER(D_DLMTRACE, env, lu_object_top(top),
272 "size: %llu mtime: %llu atime: %llu ctime: %llu blocks: %llu\n",
273 lvb->lvb_size, lvb->lvb_mtime, lvb->lvb_atime,
274 lvb->lvb_ctime, lvb->lvb_blocks);
277 EXPORT_SYMBOL(cl_object_glimpse);
280 * Updates a configuration of an object \a obj.
282 int cl_conf_set(const struct lu_env *env, struct cl_object *obj,
283 const struct cl_object_conf *conf)
285 struct lu_object_header *top;
288 top = obj->co_lu.lo_header;
290 list_for_each_entry(obj, &top->loh_layers, co_lu.lo_linkage) {
291 if (obj->co_ops->coo_conf_set) {
292 result = obj->co_ops->coo_conf_set(env, obj, conf);
299 EXPORT_SYMBOL(cl_conf_set);
302 * Prunes caches of pages and locks for this object.
304 int cl_object_prune(const struct lu_env *env, struct cl_object *obj)
306 struct lu_object_header *top;
310 top = obj->co_lu.lo_header;
312 list_for_each_entry(o, &top->loh_layers, co_lu.lo_linkage) {
313 if (o->co_ops->coo_prune) {
314 result = o->co_ops->coo_prune(env, o);
322 EXPORT_SYMBOL(cl_object_prune);
325 * Get stripe information of this object.
327 int cl_object_getstripe(const struct lu_env *env, struct cl_object *obj,
328 struct lov_user_md __user *uarg)
330 struct lu_object_header *top;
333 top = obj->co_lu.lo_header;
334 list_for_each_entry(obj, &top->loh_layers, co_lu.lo_linkage) {
335 if (obj->co_ops->coo_getstripe) {
336 result = obj->co_ops->coo_getstripe(env, obj, uarg);
343 EXPORT_SYMBOL(cl_object_getstripe);
346 * Helper function removing all object locks, and marking object for
347 * deletion. All object pages must have been deleted at this point.
349 * This is called by cl_inode_fini() and lov_object_delete() to destroy top-
350 * and sub- objects respectively.
352 void cl_object_kill(const struct lu_env *env, struct cl_object *obj)
354 struct cl_object_header *hdr = cl_object_header(obj);
356 set_bit(LU_OBJECT_HEARD_BANSHEE, &hdr->coh_lu.loh_flags);
358 EXPORT_SYMBOL(cl_object_kill);
360 void cache_stats_init(struct cache_stats *cs, const char *name)
365 for (i = 0; i < CS_NR; i++)
366 atomic_set(&cs->cs_stats[i], 0);
369 static int cache_stats_print(const struct cache_stats *cs,
370 struct seq_file *m, int h)
374 * lookup hit total cached create
375 * env: ...... ...... ...... ...... ......
378 const char *names[CS_NR] = CS_NAMES;
380 seq_printf(m, "%6s", " ");
381 for (i = 0; i < CS_NR; i++)
382 seq_printf(m, "%8s", names[i]);
386 seq_printf(m, "%5.5s:", cs->cs_name);
387 for (i = 0; i < CS_NR; i++)
388 seq_printf(m, "%8u", atomic_read(&cs->cs_stats[i]));
392 static void cl_env_percpu_refill(void);
395 * Initialize client site.
397 * Perform common initialization (lu_site_init()), and initialize statistical
398 * counters. Also perform global initializations on the first call.
400 int cl_site_init(struct cl_site *s, struct cl_device *d)
405 result = lu_site_init(&s->cs_lu, &d->cd_lu_dev);
407 cache_stats_init(&s->cs_pages, "pages");
408 for (i = 0; i < ARRAY_SIZE(s->cs_pages_state); ++i)
409 atomic_set(&s->cs_pages_state[0], 0);
410 cl_env_percpu_refill();
414 EXPORT_SYMBOL(cl_site_init);
417 * Finalize client site. Dual to cl_site_init().
419 void cl_site_fini(struct cl_site *s)
421 lu_site_fini(&s->cs_lu);
423 EXPORT_SYMBOL(cl_site_fini);
425 static struct cache_stats cl_env_stats = {
427 .cs_stats = { ATOMIC_INIT(0), }
431 * Outputs client site statistical counters into a buffer. Suitable for
432 * ll_rd_*()-style functions.
434 int cl_site_stats_print(const struct cl_site *site, struct seq_file *m)
437 static const char *pstate[] = {
445 lookup hit total busy create
446 pages: ...... ...... ...... ...... ...... [...... ...... ...... ......]
447 locks: ...... ...... ...... ...... ...... [...... ...... ...... ...... ......]
448 env: ...... ...... ...... ...... ......
450 lu_site_stats_print(&site->cs_lu, m);
451 cache_stats_print(&site->cs_pages, m, 1);
453 for (i = 0; i < ARRAY_SIZE(site->cs_pages_state); ++i)
454 seq_printf(m, "%s: %u ", pstate[i],
455 atomic_read(&site->cs_pages_state[i]));
456 seq_printf(m, "]\n");
457 cache_stats_print(&cl_env_stats, m, 0);
461 EXPORT_SYMBOL(cl_site_stats_print);
463 /*****************************************************************************
465 * lu_env handling on client.
470 * The most efficient way is to store cl_env pointer in task specific
471 * structures. On Linux, it wont' be easy to use task_struct->journal_info
472 * because Lustre code may call into other fs which has certain assumptions
473 * about journal_info. Currently following fields in task_struct are identified
474 * can be used for this purpose:
475 * - tux_info: only on RedHat kernel.
477 * \note As long as we use task_struct to store cl_env, we assume that once
478 * called into Lustre, we'll never call into the other part of the kernel
479 * which will use those fields in task_struct without explicitly exiting
482 * If there's no space in task_struct is available, hash will be used.
486 static LIST_HEAD(cl_envs);
487 static unsigned int cl_envs_cached_nr;
488 static unsigned int cl_envs_cached_max = 128; /* XXX: prototype: arbitrary limit
491 static DEFINE_SPINLOCK(cl_envs_guard);
496 struct lu_context ce_ses;
499 * This allows cl_env to be entered into cl_env_hash which implements
500 * the current thread -> client environment lookup.
502 struct hlist_node ce_node;
504 * Owner for the current cl_env.
506 * If LL_TASK_CL_ENV is defined, this point to the owning current,
507 * only for debugging purpose ;
508 * Otherwise hash is used, and this is the key for cfs_hash.
509 * Now current thread pid is stored. Note using thread pointer would
510 * lead to unbalanced hash because of its specific allocation locality
511 * and could be varied for different platforms and OSes, even different
517 * Linkage into global list of all client environments. Used for
518 * garbage collection.
520 struct list_head ce_linkage;
526 * Debugging field: address of the caller who made original
532 #define CL_ENV_INC(counter)
533 #define CL_ENV_DEC(counter)
535 static void cl_env_init0(struct cl_env *cle, void *debug)
537 LASSERT(cle->ce_ref == 0);
538 LASSERT(cle->ce_magic == &cl_env_init0);
539 LASSERT(!cle->ce_debug && !cle->ce_owner);
542 cle->ce_debug = debug;
547 * The implementation of using hash table to connect cl_env and thread
550 static struct cfs_hash *cl_env_hash;
552 static unsigned cl_env_hops_hash(struct cfs_hash *lh,
553 const void *key, unsigned mask)
555 #if BITS_PER_LONG == 64
556 return cfs_hash_u64_hash((__u64)key, mask);
558 return cfs_hash_u32_hash((__u32)key, mask);
562 static void *cl_env_hops_obj(struct hlist_node *hn)
564 struct cl_env *cle = hlist_entry(hn, struct cl_env, ce_node);
566 LASSERT(cle->ce_magic == &cl_env_init0);
570 static int cl_env_hops_keycmp(const void *key, struct hlist_node *hn)
572 struct cl_env *cle = cl_env_hops_obj(hn);
574 LASSERT(cle->ce_owner);
575 return (key == cle->ce_owner);
578 static void cl_env_hops_noop(struct cfs_hash *hs, struct hlist_node *hn)
580 struct cl_env *cle = hlist_entry(hn, struct cl_env, ce_node);
582 LASSERT(cle->ce_magic == &cl_env_init0);
585 static struct cfs_hash_ops cl_env_hops = {
586 .hs_hash = cl_env_hops_hash,
587 .hs_key = cl_env_hops_obj,
588 .hs_keycmp = cl_env_hops_keycmp,
589 .hs_object = cl_env_hops_obj,
590 .hs_get = cl_env_hops_noop,
591 .hs_put_locked = cl_env_hops_noop,
594 static inline struct cl_env *cl_env_fetch(void)
598 cle = cfs_hash_lookup(cl_env_hash, (void *)(long)current->pid);
599 LASSERT(ergo(cle, cle->ce_magic == &cl_env_init0));
603 static inline void cl_env_attach(struct cl_env *cle)
608 LASSERT(!cle->ce_owner);
609 cle->ce_owner = (void *)(long)current->pid;
610 rc = cfs_hash_add_unique(cl_env_hash, cle->ce_owner,
616 static inline void cl_env_do_detach(struct cl_env *cle)
620 LASSERT(cle->ce_owner == (void *)(long)current->pid);
621 cookie = cfs_hash_del(cl_env_hash, cle->ce_owner,
623 LASSERT(cookie == cle);
624 cle->ce_owner = NULL;
627 static int cl_env_store_init(void)
629 cl_env_hash = cfs_hash_create("cl_env",
630 HASH_CL_ENV_BITS, HASH_CL_ENV_BITS,
631 HASH_CL_ENV_BKT_BITS, 0,
635 CFS_HASH_RW_BKTLOCK);
636 return cl_env_hash ? 0 : -ENOMEM;
639 static void cl_env_store_fini(void)
641 cfs_hash_putref(cl_env_hash);
644 static inline struct cl_env *cl_env_detach(struct cl_env *cle)
647 cle = cl_env_fetch();
649 if (cle && cle->ce_owner)
650 cl_env_do_detach(cle);
655 static struct lu_env *cl_env_new(__u32 ctx_tags, __u32 ses_tags, void *debug)
660 cle = kmem_cache_zalloc(cl_env_kmem, GFP_NOFS);
664 INIT_LIST_HEAD(&cle->ce_linkage);
665 cle->ce_magic = &cl_env_init0;
667 rc = lu_env_init(env, ctx_tags | LCT_CL_THREAD);
669 rc = lu_context_init(&cle->ce_ses,
670 ses_tags | LCT_SESSION);
672 lu_context_enter(&cle->ce_ses);
673 env->le_ses = &cle->ce_ses;
674 cl_env_init0(cle, debug);
680 kmem_cache_free(cl_env_kmem, cle);
687 env = ERR_PTR(-ENOMEM);
692 static void cl_env_fini(struct cl_env *cle)
695 lu_context_fini(&cle->ce_lu.le_ctx);
696 lu_context_fini(&cle->ce_ses);
697 kmem_cache_free(cl_env_kmem, cle);
700 static struct lu_env *cl_env_obtain(void *debug)
705 spin_lock(&cl_envs_guard);
706 LASSERT(equi(cl_envs_cached_nr == 0, list_empty(&cl_envs)));
707 if (cl_envs_cached_nr > 0) {
710 cle = container_of(cl_envs.next, struct cl_env, ce_linkage);
711 list_del_init(&cle->ce_linkage);
713 spin_unlock(&cl_envs_guard);
716 rc = lu_env_refill(env);
718 cl_env_init0(cle, debug);
719 lu_context_enter(&env->le_ctx);
720 lu_context_enter(&cle->ce_ses);
726 spin_unlock(&cl_envs_guard);
727 env = cl_env_new(lu_context_tags_default,
728 lu_session_tags_default, debug);
733 static inline struct cl_env *cl_env_container(struct lu_env *env)
735 return container_of(env, struct cl_env, ce_lu);
738 static struct lu_env *cl_env_peek(int *refcheck)
745 /* check that we don't go far from untrusted pointer */
746 CLASSERT(offsetof(struct cl_env, ce_magic) == 0);
749 cle = cl_env_fetch();
753 *refcheck = ++cle->ce_ref;
755 CDEBUG(D_OTHER, "%d@%p\n", cle ? cle->ce_ref : 0, cle);
760 * Returns lu_env: if there already is an environment associated with the
761 * current thread, it is returned, otherwise, new environment is allocated.
763 * Allocations are amortized through the global cache of environments.
765 * \param refcheck pointer to a counter used to detect environment leaks. In
766 * the usual case cl_env_get() and cl_env_put() are called in the same lexical
767 * scope and pointer to the same integer is passed as \a refcheck. This is
768 * used to detect missed cl_env_put().
772 struct lu_env *cl_env_get(int *refcheck)
776 env = cl_env_peek(refcheck);
778 env = cl_env_obtain(__builtin_return_address(0));
782 cle = cl_env_container(env);
784 *refcheck = cle->ce_ref;
785 CDEBUG(D_OTHER, "%d@%p\n", cle->ce_ref, cle);
790 EXPORT_SYMBOL(cl_env_get);
793 * Forces an allocation of a fresh environment with given tags.
797 struct lu_env *cl_env_alloc(int *refcheck, __u32 tags)
801 LASSERT(!cl_env_peek(refcheck));
802 env = cl_env_new(tags, tags, __builtin_return_address(0));
806 cle = cl_env_container(env);
807 *refcheck = cle->ce_ref;
808 CDEBUG(D_OTHER, "%d@%p\n", cle->ce_ref, cle);
812 EXPORT_SYMBOL(cl_env_alloc);
814 static void cl_env_exit(struct cl_env *cle)
816 LASSERT(!cle->ce_owner);
817 lu_context_exit(&cle->ce_lu.le_ctx);
818 lu_context_exit(&cle->ce_ses);
822 * Finalizes and frees a given number of cached environments. This is done to
823 * (1) free some memory (not currently hooked into VM), or (2) release
824 * references to modules.
826 unsigned int cl_env_cache_purge(unsigned int nr)
830 spin_lock(&cl_envs_guard);
831 for (; !list_empty(&cl_envs) && nr > 0; --nr) {
832 cle = container_of(cl_envs.next, struct cl_env, ce_linkage);
833 list_del_init(&cle->ce_linkage);
834 LASSERT(cl_envs_cached_nr > 0);
836 spin_unlock(&cl_envs_guard);
839 spin_lock(&cl_envs_guard);
841 LASSERT(equi(cl_envs_cached_nr == 0, list_empty(&cl_envs)));
842 spin_unlock(&cl_envs_guard);
845 EXPORT_SYMBOL(cl_env_cache_purge);
848 * Release an environment.
850 * Decrement \a env reference counter. When counter drops to 0, nothing in
851 * this thread is using environment and it is returned to the allocation
852 * cache, or freed straight away, if cache is large enough.
854 void cl_env_put(struct lu_env *env, int *refcheck)
858 cle = cl_env_container(env);
860 LASSERT(cle->ce_ref > 0);
861 LASSERT(ergo(refcheck, cle->ce_ref == *refcheck));
863 CDEBUG(D_OTHER, "%d@%p\n", cle->ce_ref, cle);
864 if (--cle->ce_ref == 0) {
867 cle->ce_debug = NULL;
870 * Don't bother to take a lock here.
872 * Return environment to the cache only when it was allocated
873 * with the standard tags.
875 if (cl_envs_cached_nr < cl_envs_cached_max &&
876 (env->le_ctx.lc_tags & ~LCT_HAS_EXIT) == LCT_CL_THREAD &&
877 (env->le_ses->lc_tags & ~LCT_HAS_EXIT) == LCT_SESSION) {
878 spin_lock(&cl_envs_guard);
879 list_add(&cle->ce_linkage, &cl_envs);
881 spin_unlock(&cl_envs_guard);
887 EXPORT_SYMBOL(cl_env_put);
890 * Declares a point of re-entrancy.
892 * \see cl_env_reexit()
894 void *cl_env_reenter(void)
896 return cl_env_detach(NULL);
898 EXPORT_SYMBOL(cl_env_reenter);
903 void cl_env_reexit(void *cookie)
906 cl_env_attach(cookie);
908 EXPORT_SYMBOL(cl_env_reexit);
911 * Setup user-supplied \a env as a current environment. This is to be used to
912 * guaranteed that environment exists even when cl_env_get() fails. It is up
913 * to user to ensure proper concurrency control.
915 * \see cl_env_unplant()
917 void cl_env_implant(struct lu_env *env, int *refcheck)
919 struct cl_env *cle = cl_env_container(env);
921 LASSERT(cle->ce_ref > 0);
924 cl_env_get(refcheck);
925 CDEBUG(D_OTHER, "%d@%p\n", cle->ce_ref, cle);
927 EXPORT_SYMBOL(cl_env_implant);
930 * Detach environment installed earlier by cl_env_implant().
932 void cl_env_unplant(struct lu_env *env, int *refcheck)
934 struct cl_env *cle = cl_env_container(env);
936 LASSERT(cle->ce_ref > 1);
938 CDEBUG(D_OTHER, "%d@%p\n", cle->ce_ref, cle);
941 cl_env_put(env, refcheck);
943 EXPORT_SYMBOL(cl_env_unplant);
945 struct lu_env *cl_env_nested_get(struct cl_env_nest *nest)
949 nest->cen_cookie = NULL;
950 env = cl_env_peek(&nest->cen_refcheck);
952 if (!cl_io_is_going(env))
954 cl_env_put(env, &nest->cen_refcheck);
955 nest->cen_cookie = cl_env_reenter();
957 env = cl_env_get(&nest->cen_refcheck);
959 cl_env_reexit(nest->cen_cookie);
963 LASSERT(!cl_io_is_going(env));
966 EXPORT_SYMBOL(cl_env_nested_get);
968 void cl_env_nested_put(struct cl_env_nest *nest, struct lu_env *env)
970 cl_env_put(env, &nest->cen_refcheck);
971 cl_env_reexit(nest->cen_cookie);
973 EXPORT_SYMBOL(cl_env_nested_put);
976 * Converts struct ost_lvb to struct cl_attr.
980 void cl_lvb2attr(struct cl_attr *attr, const struct ost_lvb *lvb)
982 attr->cat_size = lvb->lvb_size;
983 attr->cat_mtime = lvb->lvb_mtime;
984 attr->cat_atime = lvb->lvb_atime;
985 attr->cat_ctime = lvb->lvb_ctime;
986 attr->cat_blocks = lvb->lvb_blocks;
988 EXPORT_SYMBOL(cl_lvb2attr);
990 static struct cl_env cl_env_percpu[NR_CPUS];
992 static int cl_env_percpu_init(void)
995 int tags = LCT_REMEMBER | LCT_NOREF;
999 for_each_possible_cpu(i) {
1002 cle = &cl_env_percpu[i];
1005 INIT_LIST_HEAD(&cle->ce_linkage);
1006 cle->ce_magic = &cl_env_init0;
1007 rc = lu_env_init(env, LCT_CL_THREAD | tags);
1009 rc = lu_context_init(&cle->ce_ses, LCT_SESSION | tags);
1011 lu_context_enter(&cle->ce_ses);
1012 env->le_ses = &cle->ce_ses;
1021 /* Indices 0 to i (excluding i) were correctly initialized,
1022 * thus we must uninitialize up to i, the rest are undefined.
1024 for (j = 0; j < i; j++) {
1025 cle = &cl_env_percpu[j];
1026 lu_context_exit(&cle->ce_ses);
1027 lu_context_fini(&cle->ce_ses);
1028 lu_env_fini(&cle->ce_lu);
1035 static void cl_env_percpu_fini(void)
1039 for_each_possible_cpu(i) {
1040 struct cl_env *cle = &cl_env_percpu[i];
1042 lu_context_exit(&cle->ce_ses);
1043 lu_context_fini(&cle->ce_ses);
1044 lu_env_fini(&cle->ce_lu);
1048 static void cl_env_percpu_refill(void)
1052 for_each_possible_cpu(i)
1053 lu_env_refill(&cl_env_percpu[i].ce_lu);
1056 void cl_env_percpu_put(struct lu_env *env)
1061 cpu = smp_processor_id();
1062 cle = cl_env_container(env);
1063 LASSERT(cle == &cl_env_percpu[cpu]);
1066 LASSERT(cle->ce_ref == 0);
1070 cle->ce_debug = NULL;
1074 EXPORT_SYMBOL(cl_env_percpu_put);
1076 struct lu_env *cl_env_percpu_get(void)
1080 cle = &cl_env_percpu[get_cpu()];
1081 cl_env_init0(cle, __builtin_return_address(0));
1086 EXPORT_SYMBOL(cl_env_percpu_get);
1088 /*****************************************************************************
1090 * Temporary prototype thing: mirror obd-devices into cl devices.
1094 struct cl_device *cl_type_setup(const struct lu_env *env, struct lu_site *site,
1095 struct lu_device_type *ldt,
1096 struct lu_device *next)
1098 const char *typename;
1099 struct lu_device *d;
1101 typename = ldt->ldt_name;
1102 d = ldt->ldt_ops->ldto_device_alloc(env, ldt, NULL);
1108 rc = ldt->ldt_ops->ldto_device_init(env, d, typename, next);
1111 lu_ref_add(&d->ld_reference,
1112 "lu-stack", &lu_site_init);
1114 ldt->ldt_ops->ldto_device_free(env, d);
1115 CERROR("can't init device '%s', %d\n", typename, rc);
1119 CERROR("Cannot allocate device: '%s'\n", typename);
1121 return lu2cl_dev(d);
1123 EXPORT_SYMBOL(cl_type_setup);
1126 * Finalize device stack by calling lu_stack_fini().
1128 void cl_stack_fini(const struct lu_env *env, struct cl_device *cl)
1130 lu_stack_fini(env, cl2lu_dev(cl));
1132 EXPORT_SYMBOL(cl_stack_fini);
1134 static struct lu_context_key cl_key;
1136 struct cl_thread_info *cl_env_info(const struct lu_env *env)
1138 return lu_context_key_get(&env->le_ctx, &cl_key);
1141 /* defines cl0_key_{init,fini}() */
1142 LU_KEY_INIT_FINI(cl0, struct cl_thread_info);
1144 static void *cl_key_init(const struct lu_context *ctx,
1145 struct lu_context_key *key)
1147 struct cl_thread_info *info;
1149 info = cl0_key_init(ctx, key);
1150 if (!IS_ERR(info)) {
1153 for (i = 0; i < ARRAY_SIZE(info->clt_counters); ++i)
1154 lu_ref_init(&info->clt_counters[i].ctc_locks_locked);
1159 static void cl_key_fini(const struct lu_context *ctx,
1160 struct lu_context_key *key, void *data)
1162 struct cl_thread_info *info;
1166 for (i = 0; i < ARRAY_SIZE(info->clt_counters); ++i)
1167 lu_ref_fini(&info->clt_counters[i].ctc_locks_locked);
1168 cl0_key_fini(ctx, key, data);
1171 static void cl_key_exit(const struct lu_context *ctx,
1172 struct lu_context_key *key, void *data)
1174 struct cl_thread_info *info = data;
1177 for (i = 0; i < ARRAY_SIZE(info->clt_counters); ++i) {
1178 LASSERT(info->clt_counters[i].ctc_nr_held == 0);
1179 LASSERT(info->clt_counters[i].ctc_nr_used == 0);
1180 LASSERT(info->clt_counters[i].ctc_nr_locks_acquired == 0);
1181 LASSERT(info->clt_counters[i].ctc_nr_locks_locked == 0);
1182 lu_ref_fini(&info->clt_counters[i].ctc_locks_locked);
1183 lu_ref_init(&info->clt_counters[i].ctc_locks_locked);
1187 static struct lu_context_key cl_key = {
1188 .lct_tags = LCT_CL_THREAD,
1189 .lct_init = cl_key_init,
1190 .lct_fini = cl_key_fini,
1191 .lct_exit = cl_key_exit
1194 static struct lu_kmem_descr cl_object_caches[] = {
1196 .ckd_cache = &cl_env_kmem,
1197 .ckd_name = "cl_env_kmem",
1198 .ckd_size = sizeof(struct cl_env)
1206 * Global initialization of cl-data. Create kmem caches, register
1207 * lu_context_key's, etc.
1209 * \see cl_global_fini()
1211 int cl_global_init(void)
1215 result = cl_env_store_init();
1219 result = lu_kmem_init(cl_object_caches);
1223 LU_CONTEXT_KEY_INIT(&cl_key);
1224 result = lu_context_key_register(&cl_key);
1228 result = cl_env_percpu_init();
1230 /* no cl_env_percpu_fini on error */
1236 lu_context_key_degister(&cl_key);
1238 lu_kmem_fini(cl_object_caches);
1240 cl_env_store_fini();
1245 * Finalization of global cl-data. Dual to cl_global_init().
1247 void cl_global_fini(void)
1249 cl_env_percpu_fini();
1250 lu_context_key_degister(&cl_key);
1251 lu_kmem_fini(cl_object_caches);
1252 cl_env_store_fini();