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* 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 cfs_hash_t *cl_env_hash;
static unsigned cl_env_hops_hash(cfs_hash_t *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(cfs_hash_t *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();
}
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