1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * Client Lustre Object.
38 * Author: Nikita Danilov <nikita.danilov@sun.com>
52 #define DEBUG_SUBSYSTEM S_CLASS
54 # define EXPORT_SYMTAB
57 #include <libcfs/libcfs.h>
58 /* class_put_type() */
59 #include <obd_class.h>
60 #include <obd_support.h>
61 #include <lustre_fid.h>
62 #include <libcfs/list.h>
63 #include <libcfs/libcfs_hash.h> /* for cfs_hash stuff */
64 /* lu_time_global_{init,fini}() */
67 #include <cl_object.h>
68 #include "cl_internal.h"
70 static cfs_mem_cache_t *cl_env_kmem;
72 /** Lock class of cl_object_header::coh_page_guard */
73 static cfs_lock_class_key_t cl_page_guard_class;
74 /** Lock class of cl_object_header::coh_lock_guard */
75 static cfs_lock_class_key_t cl_lock_guard_class;
76 /** Lock class of cl_object_header::coh_attr_guard */
77 static cfs_lock_class_key_t cl_attr_guard_class;
80 * Initialize cl_object_header.
82 int cl_object_header_init(struct cl_object_header *h)
87 result = lu_object_header_init(&h->coh_lu);
89 cfs_spin_lock_init(&h->coh_page_guard);
90 cfs_spin_lock_init(&h->coh_lock_guard);
91 cfs_spin_lock_init(&h->coh_attr_guard);
92 cfs_lockdep_set_class(&h->coh_attr_guard, &cl_page_guard_class);
93 cfs_lockdep_set_class(&h->coh_attr_guard, &cl_lock_guard_class);
94 cfs_lockdep_set_class(&h->coh_attr_guard, &cl_attr_guard_class);
96 /* XXX hard coded GFP_* mask. */
97 INIT_RADIX_TREE(&h->coh_tree, GFP_ATOMIC);
98 CFS_INIT_LIST_HEAD(&h->coh_locks);
102 EXPORT_SYMBOL(cl_object_header_init);
105 * Finalize cl_object_header.
107 void cl_object_header_fini(struct cl_object_header *h)
109 LASSERT(cfs_list_empty(&h->coh_locks));
110 lu_object_header_fini(&h->coh_lu);
112 EXPORT_SYMBOL(cl_object_header_fini);
115 * Returns a cl_object with a given \a fid.
117 * Returns either cached or newly created object. Additional reference on the
118 * returned object is acquired.
120 * \see lu_object_find(), cl_page_find(), cl_lock_find()
122 struct cl_object *cl_object_find(const struct lu_env *env,
123 struct cl_device *cd, const struct lu_fid *fid,
124 const struct cl_object_conf *c)
127 return lu2cl(lu_object_find_slice(env, cl2lu_dev(cd), fid, &c->coc_lu));
129 EXPORT_SYMBOL(cl_object_find);
132 * Releases a reference on \a o.
134 * When last reference is released object is returned to the cache, unless
135 * lu_object_header_flags::LU_OBJECT_HEARD_BANSHEE bit is set in its header.
137 * \see cl_page_put(), cl_lock_put().
139 void cl_object_put(const struct lu_env *env, struct cl_object *o)
141 lu_object_put(env, &o->co_lu);
143 EXPORT_SYMBOL(cl_object_put);
146 * Acquire an additional reference to the object \a o.
148 * This can only be used to acquire _additional_ reference, i.e., caller
149 * already has to possess at least one reference to \a o before calling this.
151 * \see cl_page_get(), cl_lock_get().
153 void cl_object_get(struct cl_object *o)
155 lu_object_get(&o->co_lu);
157 EXPORT_SYMBOL(cl_object_get);
160 * Returns the top-object for a given \a o.
162 * \see cl_page_top(), cl_io_top()
164 struct cl_object *cl_object_top(struct cl_object *o)
166 struct cl_object_header *hdr = cl_object_header(o);
167 struct cl_object *top;
169 while (hdr->coh_parent != NULL)
170 hdr = hdr->coh_parent;
172 top = lu2cl(lu_object_top(&hdr->coh_lu));
173 CDEBUG(D_TRACE, "%p -> %p\n", o, top);
176 EXPORT_SYMBOL(cl_object_top);
179 * Returns pointer to the lock protecting data-attributes for the given object
182 * Data-attributes are protected by the cl_object_header::coh_attr_guard
183 * spin-lock in the top-object.
185 * \see cl_attr, cl_object_attr_lock(), cl_object_operations::coo_attr_get().
187 static cfs_spinlock_t *cl_object_attr_guard(struct cl_object *o)
189 return &cl_object_header(cl_object_top(o))->coh_attr_guard;
193 * Locks data-attributes.
195 * Prevents data-attributes from changing, until lock is released by
196 * cl_object_attr_unlock(). This has to be called before calls to
197 * cl_object_attr_get(), cl_object_attr_set().
199 void cl_object_attr_lock(struct cl_object *o)
201 cfs_spin_lock(cl_object_attr_guard(o));
203 EXPORT_SYMBOL(cl_object_attr_lock);
206 * Releases data-attributes lock, acquired by cl_object_attr_lock().
208 void cl_object_attr_unlock(struct cl_object *o)
210 cfs_spin_unlock(cl_object_attr_guard(o));
212 EXPORT_SYMBOL(cl_object_attr_unlock);
215 * Returns data-attributes of an object \a obj.
217 * Every layer is asked (by calling cl_object_operations::coo_attr_get())
218 * top-to-bottom to fill in parts of \a attr that this layer is responsible
221 int cl_object_attr_get(const struct lu_env *env, struct cl_object *obj,
222 struct cl_attr *attr)
224 struct lu_object_header *top;
227 LASSERT_SPIN_LOCKED(cl_object_attr_guard(obj));
230 top = obj->co_lu.lo_header;
232 cfs_list_for_each_entry(obj, &top->loh_layers, co_lu.lo_linkage) {
233 if (obj->co_ops->coo_attr_get != NULL) {
234 result = obj->co_ops->coo_attr_get(env, obj, attr);
244 EXPORT_SYMBOL(cl_object_attr_get);
247 * Updates data-attributes of an object \a obj.
249 * Only attributes, mentioned in a validness bit-mask \a v are
250 * updated. Calls cl_object_operations::coo_attr_set() on every layer, bottom
253 int cl_object_attr_set(const struct lu_env *env, struct cl_object *obj,
254 const struct cl_attr *attr, unsigned v)
256 struct lu_object_header *top;
259 LASSERT_SPIN_LOCKED(cl_object_attr_guard(obj));
262 top = obj->co_lu.lo_header;
264 cfs_list_for_each_entry_reverse(obj, &top->loh_layers,
266 if (obj->co_ops->coo_attr_set != NULL) {
267 result = obj->co_ops->coo_attr_set(env, obj, attr, v);
277 EXPORT_SYMBOL(cl_object_attr_set);
280 * Notifies layers (bottom-to-top) that glimpse AST was received.
282 * Layers have to fill \a lvb fields with information that will be shipped
283 * back to glimpse issuer.
285 * \see cl_lock_operations::clo_glimpse()
287 int cl_object_glimpse(const struct lu_env *env, struct cl_object *obj,
290 struct lu_object_header *top;
294 top = obj->co_lu.lo_header;
296 cfs_list_for_each_entry_reverse(obj, &top->loh_layers,
298 if (obj->co_ops->coo_glimpse != NULL) {
299 result = obj->co_ops->coo_glimpse(env, obj, lvb);
304 LU_OBJECT_HEADER(D_DLMTRACE, env, lu_object_top(top),
305 "size: "LPU64" mtime: "LPU64" atime: "LPU64" "
306 "ctime: "LPU64" blocks: "LPU64"\n",
307 lvb->lvb_size, lvb->lvb_mtime, lvb->lvb_atime,
308 lvb->lvb_ctime, lvb->lvb_blocks);
311 EXPORT_SYMBOL(cl_object_glimpse);
314 * Updates a configuration of an object \a obj.
316 int cl_conf_set(const struct lu_env *env, struct cl_object *obj,
317 const struct cl_object_conf *conf)
319 struct lu_object_header *top;
323 top = obj->co_lu.lo_header;
325 cfs_list_for_each_entry(obj, &top->loh_layers, co_lu.lo_linkage) {
326 if (obj->co_ops->coo_conf_set != NULL) {
327 result = obj->co_ops->coo_conf_set(env, obj, conf);
334 EXPORT_SYMBOL(cl_conf_set);
337 * Helper function removing all object locks, and marking object for
338 * deletion. All object pages must have been deleted at this point.
340 * This is called by cl_inode_fini() and lov_object_delete() to destroy top-
341 * and sub- objects respectively.
343 void cl_object_kill(const struct lu_env *env, struct cl_object *obj)
345 struct cl_object_header *hdr;
347 hdr = cl_object_header(obj);
348 LASSERT(hdr->coh_tree.rnode == NULL);
349 LASSERT(hdr->coh_pages == 0);
351 cfs_set_bit(LU_OBJECT_HEARD_BANSHEE, &hdr->coh_lu.loh_flags);
353 * Destroy all locks. Object destruction (including cl_inode_fini())
354 * cannot cancel the locks, because in the case of a local client,
355 * where client and server share the same thread running
356 * prune_icache(), this can dead-lock with ldlm_cancel_handler()
357 * waiting on __wait_on_freeing_inode().
359 cl_locks_prune(env, obj, 0);
361 EXPORT_SYMBOL(cl_object_kill);
364 * Prunes caches of pages and locks for this object.
366 void cl_object_prune(const struct lu_env *env, struct cl_object *obj)
369 cl_pages_prune(env, obj);
370 cl_locks_prune(env, obj, 1);
373 EXPORT_SYMBOL(cl_object_prune);
376 * Check if the object has locks.
378 int cl_object_has_locks(struct cl_object *obj)
380 struct cl_object_header *head = cl_object_header(obj);
383 cfs_spin_lock(&head->coh_lock_guard);
384 has = cfs_list_empty(&head->coh_locks);
385 cfs_spin_unlock(&head->coh_lock_guard);
389 EXPORT_SYMBOL(cl_object_has_locks);
391 void cache_stats_init(struct cache_stats *cs, const char *name)
394 cfs_atomic_set(&cs->cs_lookup, 0);
395 cfs_atomic_set(&cs->cs_hit, 0);
396 cfs_atomic_set(&cs->cs_total, 0);
397 cfs_atomic_set(&cs->cs_busy, 0);
400 int cache_stats_print(const struct cache_stats *cs,
401 char *page, int count, int h)
405 lookup hit total cached create
406 env: ...... ...... ...... ...... ......
409 nob += snprintf(page, count,
410 " lookup hit total busy create\n");
412 nob += snprintf(page + nob, count - nob,
413 "%5.5s: %6u %6u %6u %6u %6u",
415 cfs_atomic_read(&cs->cs_lookup),
416 cfs_atomic_read(&cs->cs_hit),
417 cfs_atomic_read(&cs->cs_total),
418 cfs_atomic_read(&cs->cs_busy),
419 cfs_atomic_read(&cs->cs_created));
424 * Initialize client site.
426 * Perform common initialization (lu_site_init()), and initialize statistical
427 * counters. Also perform global initializations on the first call.
429 int cl_site_init(struct cl_site *s, struct cl_device *d)
434 result = lu_site_init(&s->cs_lu, &d->cd_lu_dev);
436 cache_stats_init(&s->cs_pages, "pages");
437 cache_stats_init(&s->cs_locks, "locks");
438 for (i = 0; i < ARRAY_SIZE(s->cs_pages_state); ++i)
439 cfs_atomic_set(&s->cs_pages_state[0], 0);
440 for (i = 0; i < ARRAY_SIZE(s->cs_locks_state); ++i)
441 cfs_atomic_set(&s->cs_locks_state[i], 0);
445 EXPORT_SYMBOL(cl_site_init);
448 * Finalize client site. Dual to cl_site_init().
450 void cl_site_fini(struct cl_site *s)
452 lu_site_fini(&s->cs_lu);
454 EXPORT_SYMBOL(cl_site_fini);
456 static struct cache_stats cl_env_stats = {
458 .cs_created = CFS_ATOMIC_INIT(0),
459 .cs_lookup = CFS_ATOMIC_INIT(0),
460 .cs_hit = CFS_ATOMIC_INIT(0),
461 .cs_total = CFS_ATOMIC_INIT(0),
462 .cs_busy = CFS_ATOMIC_INIT(0)
466 * Outputs client site statistical counters into a buffer. Suitable for
467 * ll_rd_*()-style functions.
469 int cl_site_stats_print(const struct cl_site *site, char *page, int count)
473 static const char *pstate[] = {
480 static const char *lstate[] = {
483 [CLS_ENQUEUED] = "e",
485 [CLS_INTRANSIT] = "t",
490 lookup hit total busy create
491 pages: ...... ...... ...... ...... ...... [...... ...... ...... ......]
492 locks: ...... ...... ...... ...... ...... [...... ...... ...... ...... ......]
493 env: ...... ...... ...... ...... ......
495 nob = lu_site_stats_print(&site->cs_lu, page, count);
496 nob += cache_stats_print(&site->cs_pages, page + nob, count - nob, 1);
497 nob += snprintf(page + nob, count - nob, " [");
498 for (i = 0; i < ARRAY_SIZE(site->cs_pages_state); ++i)
499 nob += snprintf(page + nob, count - nob, "%s: %u ",
501 cfs_atomic_read(&site->cs_pages_state[i]));
502 nob += snprintf(page + nob, count - nob, "]\n");
503 nob += cache_stats_print(&site->cs_locks, page + nob, count - nob, 0);
504 nob += snprintf(page + nob, count - nob, " [");
505 for (i = 0; i < ARRAY_SIZE(site->cs_locks_state); ++i)
506 nob += snprintf(page + nob, count - nob, "%s: %u ",
508 cfs_atomic_read(&site->cs_locks_state[i]));
509 nob += snprintf(page + nob, count - nob, "]\n");
510 nob += cache_stats_print(&cl_env_stats, page + nob, count - nob, 0);
511 nob += snprintf(page + nob, count - nob, "\n");
514 EXPORT_SYMBOL(cl_site_stats_print);
516 /*****************************************************************************
518 * lu_env handling on client.
522 static CFS_LIST_HEAD(cl_envs);
523 static unsigned cl_envs_cached_nr = 0;
524 static unsigned cl_envs_cached_max = 128; /* XXX: prototype: arbitrary limit
526 static cfs_spinlock_t cl_envs_guard = CFS_SPIN_LOCK_UNLOCKED;
531 struct lu_context ce_ses;
533 * This allows cl_env to be entered into cl_env_hash which implements
534 * the current thread -> client environment lookup.
536 cfs_hlist_node_t ce_node;
538 * Owner for the current cl_env, the key for cfs_hash.
539 * Now current thread pointer is stored.
543 * Linkage into global list of all client environments. Used for
544 * garbage collection.
546 cfs_list_t ce_linkage;
552 * Debugging field: address of the caller who made original
558 #define CL_ENV_INC(counter) cfs_atomic_inc(&cl_env_stats.counter)
560 #define CL_ENV_DEC(counter) \
562 LASSERT(cfs_atomic_read(&cl_env_stats.counter) > 0); \
563 cfs_atomic_dec(&cl_env_stats.counter); \
566 /*****************************************************************************
567 * Routins to use cfs_hash functionality to bind the current thread
571 /** lustre hash to manage the cl_env for current thread */
572 static cfs_hash_t *cl_env_hash;
573 static void cl_env_init0(struct cl_env *cle, void *debug);
575 static unsigned cl_env_hops_hash(cfs_hash_t *lh, void *key, unsigned mask)
577 #if BITS_PER_LONG == 64
578 return cfs_hash_u64_hash((__u64)key, mask);
580 return cfs_hash_u32_hash((__u32)key, mask);
584 static void *cl_env_hops_obj(cfs_hlist_node_t *hn)
586 struct cl_env *cle = cfs_hlist_entry(hn, struct cl_env, ce_node);
587 LASSERT(cle->ce_magic == &cl_env_init0);
591 static int cl_env_hops_compare(void *key, cfs_hlist_node_t *hn)
593 struct cl_env *cle = cl_env_hops_obj(hn);
595 LASSERT(cle->ce_owner != NULL);
596 return (key == cle->ce_owner);
599 static cfs_hash_ops_t cl_env_hops = {
600 .hs_hash = cl_env_hops_hash,
601 .hs_compare = cl_env_hops_compare,
602 .hs_key = cl_env_hops_obj,
603 .hs_get = cl_env_hops_obj,
604 .hs_put = cl_env_hops_obj,
607 static inline struct cl_env *cl_env_fetch(void)
610 cle = cfs_hash_lookup(cl_env_hash, cfs_current());
611 LASSERT(ergo(cle, cle->ce_magic == &cl_env_init0));
615 static inline void cl_env_attach(struct cl_env *cle)
619 LASSERT(cle->ce_owner == NULL);
620 cle->ce_owner = cfs_current();
621 rc = cfs_hash_add_unique(cl_env_hash, cle->ce_owner,
627 static inline struct cl_env *cl_env_detach(struct cl_env *cle)
630 cle = cl_env_fetch();
631 if (cle && cle->ce_owner) {
633 LASSERT(cle->ce_owner == cfs_current());
634 cookie = cfs_hash_del(cl_env_hash, cle->ce_owner,
636 cle->ce_owner = NULL;
637 LASSERT(cookie == cle);
641 /* ----------------------- hash routines end ---------------------------- */
643 static void cl_env_init0(struct cl_env *cle, void *debug)
645 LASSERT(cle->ce_ref == 0);
646 LASSERT(cle->ce_magic == &cl_env_init0);
647 LASSERT(cle->ce_debug == NULL && cle->ce_owner == NULL);
650 cle->ce_debug = debug;
654 static struct lu_env *cl_env_new(__u32 tags, void *debug)
659 OBD_SLAB_ALLOC_PTR_GFP(cle, cl_env_kmem, CFS_ALLOC_IO);
663 CFS_INIT_LIST_HEAD(&cle->ce_linkage);
664 cle->ce_magic = &cl_env_init0;
666 rc = lu_env_init(env, LCT_CL_THREAD|tags);
668 rc = lu_context_init(&cle->ce_ses, LCT_SESSION|tags);
670 lu_context_enter(&cle->ce_ses);
671 env->le_ses = &cle->ce_ses;
672 cl_env_init0(cle, debug);
677 OBD_SLAB_FREE_PTR(cle, cl_env_kmem);
680 CL_ENV_INC(cs_created);
681 CL_ENV_INC(cs_total);
684 env = ERR_PTR(-ENOMEM);
688 static void cl_env_fini(struct cl_env *cle)
690 CL_ENV_DEC(cs_total);
691 lu_context_fini(&cle->ce_lu.le_ctx);
692 lu_context_fini(&cle->ce_ses);
693 OBD_SLAB_FREE_PTR(cle, cl_env_kmem);
696 static struct lu_env *cl_env_obtain(void *debug)
702 cfs_spin_lock(&cl_envs_guard);
703 LASSERT(equi(cl_envs_cached_nr == 0, cfs_list_empty(&cl_envs)));
704 if (cl_envs_cached_nr > 0) {
707 cle = container_of(cl_envs.next, struct cl_env, ce_linkage);
708 cfs_list_del_init(&cle->ce_linkage);
710 cfs_spin_unlock(&cl_envs_guard);
713 rc = lu_env_refill(env);
715 cl_env_init0(cle, debug);
716 lu_context_enter(&env->le_ctx);
717 lu_context_enter(&cle->ce_ses);
723 cfs_spin_unlock(&cl_envs_guard);
724 env = cl_env_new(0, debug);
729 static inline struct cl_env *cl_env_container(struct lu_env *env)
731 return container_of(env, struct cl_env, ce_lu);
734 struct lu_env *cl_env_peek(int *refcheck)
739 CL_ENV_INC(cs_lookup);
741 /* check that we don't go far from untrusted pointer */
742 CLASSERT(offsetof(struct cl_env, ce_magic) == 0);
745 cle = cl_env_fetch();
749 *refcheck = ++cle->ce_ref;
751 CDEBUG(D_OTHER, "%i@%p\n", cle ? cle->ce_ref : 0, cle);
754 EXPORT_SYMBOL(cl_env_peek);
757 * Returns lu_env: if there already is an environment associated with the
758 * current thread, it is returned, otherwise, new environment is allocated.
760 * Allocations are amortized through the global cache of environments.
762 * \param refcheck pointer to a counter used to detect environment leaks. In
763 * the usual case cl_env_get() and cl_env_put() are called in the same lexical
764 * scope and pointer to the same integer is passed as \a refcheck. This is
765 * used to detect missed cl_env_put().
769 struct lu_env *cl_env_get(int *refcheck)
773 env = cl_env_peek(refcheck);
775 env = cl_env_obtain(__builtin_return_address(0));
779 cle = cl_env_container(env);
781 *refcheck = cle->ce_ref;
782 CDEBUG(D_OTHER, "%i@%p\n", cle->ce_ref, cle);
787 EXPORT_SYMBOL(cl_env_get);
790 * Forces an allocation of a fresh environment with given tags.
794 struct lu_env *cl_env_alloc(int *refcheck, __u32 tags)
798 LASSERT(cl_env_peek(refcheck) == NULL);
799 env = cl_env_new(tags, __builtin_return_address(0));
803 cle = cl_env_container(env);
804 *refcheck = cle->ce_ref;
805 CDEBUG(D_OTHER, "%i@%p\n", cle->ce_ref, cle);
809 EXPORT_SYMBOL(cl_env_alloc);
811 static void cl_env_exit(struct cl_env *cle)
813 LASSERT(cle->ce_owner == NULL);
814 lu_context_exit(&cle->ce_lu.le_ctx);
815 lu_context_exit(&cle->ce_ses);
819 * Finalizes and frees a given number of cached environments. This is done to
820 * (1) free some memory (not currently hooked into VM), or (2) release
821 * references to modules.
823 unsigned cl_env_cache_purge(unsigned nr)
828 cfs_spin_lock(&cl_envs_guard);
829 for (; !cfs_list_empty(&cl_envs) && nr > 0; --nr) {
830 cle = container_of(cl_envs.next, struct cl_env, ce_linkage);
831 cfs_list_del_init(&cle->ce_linkage);
832 LASSERT(cl_envs_cached_nr > 0);
834 cfs_spin_unlock(&cl_envs_guard);
837 cfs_spin_lock(&cl_envs_guard);
839 LASSERT(equi(cl_envs_cached_nr == 0, cfs_list_empty(&cl_envs)));
840 cfs_spin_unlock(&cl_envs_guard);
843 EXPORT_SYMBOL(cl_env_cache_purge);
846 * Release an environment.
848 * Decrement \a env reference counter. When counter drops to 0, nothing in
849 * this thread is using environment and it is returned to the allocation
850 * cache, or freed straight away, if cache is large enough.
852 void cl_env_put(struct lu_env *env, int *refcheck)
856 cle = cl_env_container(env);
858 LASSERT(cle->ce_ref > 0);
859 LASSERT(ergo(refcheck != NULL, cle->ce_ref == *refcheck));
861 CDEBUG(D_OTHER, "%i@%p\n", cle->ce_ref, cle);
862 if (--cle->ce_ref == 0) {
865 cle->ce_debug = NULL;
868 * Don't bother to take a lock here.
870 * Return environment to the cache only when it was allocated
871 * with the standard tags.
873 if (cl_envs_cached_nr < cl_envs_cached_max &&
874 (env->le_ctx.lc_tags & ~LCT_HAS_EXIT) == LCT_CL_THREAD &&
875 (env->le_ses->lc_tags & ~LCT_HAS_EXIT) == LCT_SESSION) {
876 cfs_spin_lock(&cl_envs_guard);
877 cfs_list_add(&cle->ce_linkage, &cl_envs);
879 cfs_spin_unlock(&cl_envs_guard);
884 EXPORT_SYMBOL(cl_env_put);
887 * Declares a point of re-entrancy.
889 * \see cl_env_reexit()
891 void *cl_env_reenter(void)
893 return cl_env_detach(NULL);
895 EXPORT_SYMBOL(cl_env_reenter);
900 void cl_env_reexit(void *cookie)
903 cl_env_attach(cookie);
905 EXPORT_SYMBOL(cl_env_reexit);
908 * Setup user-supplied \a env as a current environment. This is to be used to
909 * guaranteed that environment exists even when cl_env_get() fails. It is up
910 * to user to ensure proper concurrency control.
912 * \see cl_env_unplant()
914 void cl_env_implant(struct lu_env *env, int *refcheck)
916 struct cl_env *cle = cl_env_container(env);
918 LASSERT(cle->ce_ref > 0);
921 cl_env_get(refcheck);
922 CDEBUG(D_OTHER, "%i@%p\n", cle->ce_ref, cle);
924 EXPORT_SYMBOL(cl_env_implant);
927 * Detach environment installed earlier by cl_env_implant().
929 void cl_env_unplant(struct lu_env *env, int *refcheck)
931 struct cl_env *cle = cl_env_container(env);
933 LASSERT(cle->ce_ref > 1);
935 CDEBUG(D_OTHER, "%i@%p\n", cle->ce_ref, cle);
938 cl_env_put(env, refcheck);
940 EXPORT_SYMBOL(cl_env_unplant);
942 struct lu_env *cl_env_nested_get(struct cl_env_nest *nest)
946 nest->cen_cookie = NULL;
947 env = cl_env_peek(&nest->cen_refcheck);
949 if (!cl_io_is_going(env))
952 cl_env_put(env, &nest->cen_refcheck);
953 nest->cen_cookie = cl_env_reenter();
956 env = cl_env_get(&nest->cen_refcheck);
958 cl_env_reexit(nest->cen_cookie);
962 LASSERT(!cl_io_is_going(env));
965 EXPORT_SYMBOL(cl_env_nested_get);
967 void cl_env_nested_put(struct cl_env_nest *nest, struct lu_env *env)
969 cl_env_put(env, &nest->cen_refcheck);
970 cl_env_reexit(nest->cen_cookie);
972 EXPORT_SYMBOL(cl_env_nested_put);
975 * Converts struct cl_attr to struct ost_lvb.
979 void cl_attr2lvb(struct ost_lvb *lvb, const struct cl_attr *attr)
982 lvb->lvb_size = attr->cat_size;
983 lvb->lvb_mtime = attr->cat_mtime;
984 lvb->lvb_atime = attr->cat_atime;
985 lvb->lvb_ctime = attr->cat_ctime;
986 lvb->lvb_blocks = attr->cat_blocks;
989 EXPORT_SYMBOL(cl_attr2lvb);
992 * Converts struct ost_lvb to struct cl_attr.
996 void cl_lvb2attr(struct cl_attr *attr, const struct ost_lvb *lvb)
999 attr->cat_size = lvb->lvb_size;
1000 attr->cat_mtime = lvb->lvb_mtime;
1001 attr->cat_atime = lvb->lvb_atime;
1002 attr->cat_ctime = lvb->lvb_ctime;
1003 attr->cat_blocks = lvb->lvb_blocks;
1006 EXPORT_SYMBOL(cl_lvb2attr);
1008 /*****************************************************************************
1010 * Temporary prototype thing: mirror obd-devices into cl devices.
1014 struct cl_device *cl_type_setup(const struct lu_env *env, struct lu_site *site,
1015 struct lu_device_type *ldt,
1016 struct lu_device *next)
1018 const char *typename;
1019 struct lu_device *d;
1021 LASSERT(ldt != NULL);
1023 typename = ldt->ldt_name;
1024 d = ldt->ldt_ops->ldto_device_alloc(env, ldt, NULL);
1030 rc = ldt->ldt_ops->ldto_device_init(env, d, typename, next);
1033 lu_ref_add(&d->ld_reference,
1034 "lu-stack", &lu_site_init);
1036 ldt->ldt_ops->ldto_device_free(env, d);
1037 CERROR("can't init device '%s', %d\n", typename, rc);
1041 CERROR("Cannot allocate device: '%s'\n", typename);
1042 return lu2cl_dev(d);
1044 EXPORT_SYMBOL(cl_type_setup);
1047 * Finalize device stack by calling lu_stack_fini().
1049 void cl_stack_fini(const struct lu_env *env, struct cl_device *cl)
1051 lu_stack_fini(env, cl2lu_dev(cl));
1053 EXPORT_SYMBOL(cl_stack_fini);
1055 int cl_lock_init(void);
1056 void cl_lock_fini(void);
1058 int cl_page_init(void);
1059 void cl_page_fini(void);
1061 static struct lu_context_key cl_key;
1063 struct cl_thread_info *cl_env_info(const struct lu_env *env)
1065 return lu_context_key_get(&env->le_ctx, &cl_key);
1068 /* defines cl0_key_{init,fini}() */
1069 LU_KEY_INIT_FINI(cl0, struct cl_thread_info);
1071 static void *cl_key_init(const struct lu_context *ctx,
1072 struct lu_context_key *key)
1074 struct cl_thread_info *info;
1076 info = cl0_key_init(ctx, key);
1077 if (!IS_ERR(info)) {
1080 for (i = 0; i < ARRAY_SIZE(info->clt_counters); ++i)
1081 lu_ref_init(&info->clt_counters[i].ctc_locks_locked);
1086 static void cl_key_fini(const struct lu_context *ctx,
1087 struct lu_context_key *key, void *data)
1089 struct cl_thread_info *info;
1093 for (i = 0; i < ARRAY_SIZE(info->clt_counters); ++i)
1094 lu_ref_fini(&info->clt_counters[i].ctc_locks_locked);
1095 cl0_key_fini(ctx, key, data);
1098 static void cl_key_exit(const struct lu_context *ctx,
1099 struct lu_context_key *key, void *data)
1101 struct cl_thread_info *info = data;
1104 for (i = 0; i < ARRAY_SIZE(info->clt_counters); ++i) {
1105 LASSERT(info->clt_counters[i].ctc_nr_held == 0);
1106 LASSERT(info->clt_counters[i].ctc_nr_used == 0);
1107 LASSERT(info->clt_counters[i].ctc_nr_locks_acquired == 0);
1108 LASSERT(info->clt_counters[i].ctc_nr_locks_locked == 0);
1109 lu_ref_fini(&info->clt_counters[i].ctc_locks_locked);
1110 lu_ref_init(&info->clt_counters[i].ctc_locks_locked);
1114 static struct lu_context_key cl_key = {
1115 .lct_tags = LCT_CL_THREAD,
1116 .lct_init = cl_key_init,
1117 .lct_fini = cl_key_fini,
1118 .lct_exit = cl_key_exit
1121 static struct lu_kmem_descr cl_object_caches[] = {
1123 .ckd_cache = &cl_env_kmem,
1124 .ckd_name = "cl_env_kmem",
1125 .ckd_size = sizeof (struct cl_env)
1133 * Global initialization of cl-data. Create kmem caches, register
1134 * lu_context_key's, etc.
1136 * \see cl_global_fini()
1138 int cl_global_init(void)
1142 cl_env_hash = cfs_hash_create("cl_env", 8, 10, &cl_env_hops,
1144 if (cl_env_hash == NULL)
1147 result = lu_kmem_init(cl_object_caches);
1149 LU_CONTEXT_KEY_INIT(&cl_key);
1150 result = lu_context_key_register(&cl_key);
1152 result = cl_lock_init();
1154 result = cl_page_init();
1158 cfs_hash_destroy(cl_env_hash);
1163 * Finalization of global cl-data. Dual to cl_global_init().
1165 void cl_global_fini(void)
1169 lu_context_key_degister(&cl_key);
1170 lu_kmem_fini(cl_object_caches);
1171 cfs_hash_destroy(cl_env_hash);