-/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
- * vim:expandtab:shiftwidth=8:tabstop=8:
- *
+/*
* GPL HEADER START
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
* GPL HEADER END
*/
/*
- * Copyright 2008 Sun Microsystems, Inc. All rights reserved
+ * Copyright (c) 2007, 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/
*/
#define DEBUG_SUBSYSTEM S_CLASS
-#ifndef EXPORT_SYMTAB
-# define EXPORT_SYMTAB
-#endif
#include <libcfs/libcfs.h>
#include <lustre_disk.h>
#include <lustre_fid.h>
#include <lu_object.h>
+#include <lu_ref.h>
#include <libcfs/list.h>
-/* lu_time_global_{init,fini}() */
-#include <lu_time.h>
static void lu_object_free(const struct lu_env *env, struct lu_object *o);
*/
void lu_object_put(const struct lu_env *env, struct lu_object *o)
{
+ struct lu_site_bkt_data *bkt;
struct lu_object_header *top;
struct lu_site *site;
struct lu_object *orig;
- int kill_it;
+ cfs_hash_bd_t bd;
+ const struct lu_fid *fid;
- top = o->lo_header;
+ top = o->lo_header;
site = o->lo_dev->ld_site;
orig = o;
- kill_it = 0;
- write_lock(&site->ls_guard);
- if (atomic_dec_and_test(&top->loh_ref)) {
- /*
- * When last reference is released, iterate over object
- * layers, and notify them that object is no longer busy.
- */
- list_for_each_entry_reverse(o, &top->loh_layers, lo_linkage) {
- if (o->lo_ops->loo_object_release != NULL)
- o->lo_ops->loo_object_release(env, o);
- }
- -- site->ls_busy;
+
+ /*
+ * till we have full fids-on-OST implemented anonymous objects
+ * are possible in OSP. such an object isn't listed in the site
+ * so we should not remove it from the site.
+ */
+ fid = lu_object_fid(o);
+ if (fid_is_zero(fid)) {
+ LASSERT(top->loh_hash.next == NULL
+ && top->loh_hash.pprev == NULL);
+ LASSERT(cfs_list_empty(&top->loh_lru));
+ if (!cfs_atomic_dec_and_test(&top->loh_ref))
+ return;
+ cfs_list_for_each_entry_reverse(o, &top->loh_layers, lo_linkage) {
+ if (o->lo_ops->loo_object_release != NULL)
+ o->lo_ops->loo_object_release(env, o);
+ }
+ lu_object_free(env, orig);
+ return;
+ }
+
+ cfs_hash_bd_get(site->ls_obj_hash, &top->loh_fid, &bd);
+ bkt = cfs_hash_bd_extra_get(site->ls_obj_hash, &bd);
+
+ if (!cfs_hash_bd_dec_and_lock(site->ls_obj_hash, &bd, &top->loh_ref)) {
if (lu_object_is_dying(top)) {
+
/*
- * If object is dying (will not be cached), removed it
- * from hash table and LRU.
- *
- * This is done with hash table and LRU lists
- * locked. As the only way to acquire first reference
- * to previously unreferenced object is through
- * hash-table lookup (lu_object_find()), or LRU
- * scanning (lu_site_purge()), that are done under
- * hash-table and LRU lock, no race with concurrent
- * object lookup is possible and we can safely destroy
- * object below.
+ * somebody may be waiting for this, currently only
+ * used for cl_object, see cl_object_put_last().
*/
- hlist_del_init(&top->loh_hash);
- list_del_init(&top->loh_lru);
- -- site->ls_total;
- kill_it = 1;
+ cfs_waitq_broadcast(&bkt->lsb_marche_funebre);
}
+ return;
}
- write_unlock(&site->ls_guard);
- if (kill_it)
- /*
- * Object was already removed from hash and lru above, can
- * kill it.
- */
- lu_object_free(env, orig);
+
+ LASSERT(bkt->lsb_busy > 0);
+ bkt->lsb_busy--;
+ /*
+ * When last reference is released, iterate over object
+ * layers, and notify them that object is no longer busy.
+ */
+ cfs_list_for_each_entry_reverse(o, &top->loh_layers, lo_linkage) {
+ if (o->lo_ops->loo_object_release != NULL)
+ o->lo_ops->loo_object_release(env, o);
+ }
+
+ if (!lu_object_is_dying(top)) {
+ LASSERT(cfs_list_empty(&top->loh_lru));
+ cfs_list_add_tail(&top->loh_lru, &bkt->lsb_lru);
+ cfs_hash_bd_unlock(site->ls_obj_hash, &bd, 1);
+ return;
+ }
+
+ /*
+ * If object is dying (will not be cached), removed it
+ * from hash table and LRU.
+ *
+ * This is done with hash table and LRU lists locked. As the only
+ * way to acquire first reference to previously unreferenced
+ * object is through hash-table lookup (lu_object_find()),
+ * or LRU scanning (lu_site_purge()), that are done under hash-table
+ * and LRU lock, no race with concurrent object lookup is possible
+ * and we can safely destroy object below.
+ */
+ if (!test_and_set_bit(LU_OBJECT_UNHASHED, &top->loh_flags))
+ cfs_hash_bd_del_locked(site->ls_obj_hash, &bd, &top->loh_hash);
+ cfs_hash_bd_unlock(site->ls_obj_hash, &bd, 1);
+ /*
+ * Object was already removed from hash and lru above, can
+ * kill it.
+ */
+ lu_object_free(env, orig);
}
EXPORT_SYMBOL(lu_object_put);
/**
+ * Put object and don't keep in cache. This is temporary solution for
+ * multi-site objects when its layering is not constant.
+ */
+void lu_object_put_nocache(const struct lu_env *env, struct lu_object *o)
+{
+ set_bit(LU_OBJECT_HEARD_BANSHEE, &o->lo_header->loh_flags);
+ return lu_object_put(env, o);
+}
+EXPORT_SYMBOL(lu_object_put_nocache);
+
+/**
+ * Kill the object and take it out of LRU cache.
+ * Currently used by client code for layout change.
+ */
+void lu_object_unhash(const struct lu_env *env, struct lu_object *o)
+{
+ struct lu_object_header *top;
+
+ top = o->lo_header;
+ set_bit(LU_OBJECT_HEARD_BANSHEE, &top->loh_flags);
+ if (!test_and_set_bit(LU_OBJECT_UNHASHED, &top->loh_flags)) {
+ cfs_hash_t *obj_hash = o->lo_dev->ld_site->ls_obj_hash;
+ cfs_hash_bd_t bd;
+
+ cfs_hash_bd_get_and_lock(obj_hash, &top->loh_fid, &bd, 1);
+ cfs_list_del_init(&top->loh_lru);
+ cfs_hash_bd_del_locked(obj_hash, &bd, &top->loh_hash);
+ cfs_hash_bd_unlock(obj_hash, &bd, 1);
+ }
+}
+EXPORT_SYMBOL(lu_object_unhash);
+
+/**
* Allocate new object.
*
* This follows object creation protocol, described in the comment within
{
struct lu_object *scan;
struct lu_object *top;
- struct list_head *layers;
+ cfs_list_t *layers;
int clean;
int result;
ENTRY;
- /*
- * Create top-level object slice. This will also create
- * lu_object_header.
- */
- top = dev->ld_ops->ldo_object_alloc(env, NULL, dev);
- if (top == NULL)
- RETURN(ERR_PTR(-ENOMEM));
+ /*
+ * Create top-level object slice. This will also create
+ * lu_object_header.
+ */
+ top = dev->ld_ops->ldo_object_alloc(env, NULL, dev);
+ if (top == NULL)
+ RETURN(ERR_PTR(-ENOMEM));
+ if (IS_ERR(top))
+ RETURN(top);
/*
* This is the only place where object fid is assigned. It's constant
* after this point.
*/
- LASSERT(fid_is_igif(f) || fid_ver(f) == 0);
- top->lo_header->loh_fid = *f;
+ top->lo_header->loh_fid = *f;
layers = &top->lo_header->loh_layers;
do {
/*
* object slices are created.
*/
clean = 1;
- list_for_each_entry(scan, layers, lo_linkage) {
+ cfs_list_for_each_entry(scan, layers, lo_linkage) {
if (scan->lo_flags & LU_OBJECT_ALLOCATED)
continue;
clean = 0;
}
} while (!clean);
- list_for_each_entry_reverse(scan, layers, lo_linkage) {
+ cfs_list_for_each_entry_reverse(scan, layers, lo_linkage) {
if (scan->lo_ops->loo_object_start != NULL) {
result = scan->lo_ops->loo_object_start(env, scan);
if (result != 0) {
}
}
- dev->ld_site->ls_stats.s_created ++;
+ lprocfs_counter_incr(dev->ld_site->ls_stats, LU_SS_CREATED);
RETURN(top);
}
*/
static void lu_object_free(const struct lu_env *env, struct lu_object *o)
{
- struct list_head splice;
- struct lu_object *scan;
+ struct lu_site_bkt_data *bkt;
struct lu_site *site;
- struct list_head *layers;
+ struct lu_object *scan;
+ cfs_list_t *layers;
+ cfs_list_t splice;
site = o->lo_dev->ld_site;
layers = &o->lo_header->loh_layers;
+ bkt = lu_site_bkt_from_fid(site, &o->lo_header->loh_fid);
/*
* First call ->loo_object_delete() method to release all resources.
*/
- list_for_each_entry_reverse(scan, layers, lo_linkage) {
+ cfs_list_for_each_entry_reverse(scan, layers, lo_linkage) {
if (scan->lo_ops->loo_object_delete != NULL)
scan->lo_ops->loo_object_delete(env, scan);
}
* top-level slice.
*/
CFS_INIT_LIST_HEAD(&splice);
- list_splice_init(layers, &splice);
- while (!list_empty(&splice)) {
+ cfs_list_splice_init(layers, &splice);
+ while (!cfs_list_empty(&splice)) {
/*
* Free layers in bottom-to-top order, so that object header
* lives as long as possible and ->loo_object_free() methods
* can look at its contents.
*/
o = container_of0(splice.prev, struct lu_object, lo_linkage);
- list_del_init(&o->lo_linkage);
+ cfs_list_del_init(&o->lo_linkage);
LASSERT(o->lo_ops->loo_object_free != NULL);
o->lo_ops->loo_object_free(env, o);
}
- cfs_waitq_broadcast(&site->ls_marche_funebre);
+
+ if (cfs_waitq_active(&bkt->lsb_marche_funebre))
+ cfs_waitq_broadcast(&bkt->lsb_marche_funebre);
}
/**
*/
int lu_site_purge(const struct lu_env *env, struct lu_site *s, int nr)
{
- struct list_head dispose;
struct lu_object_header *h;
struct lu_object_header *temp;
+ struct lu_site_bkt_data *bkt;
+ cfs_hash_bd_t bd;
+ cfs_hash_bd_t bd2;
+ cfs_list_t dispose;
+ int did_sth;
+ int start;
+ int count;
+ int bnr;
+ int i;
+
+ if (OBD_FAIL_CHECK(OBD_FAIL_OBD_NO_LRU))
+ RETURN(0);
CFS_INIT_LIST_HEAD(&dispose);
/*
* Under LRU list lock, scan LRU list and move unreferenced objects to
* the dispose list, removing them from LRU and hash table.
*/
- write_lock(&s->ls_guard);
- list_for_each_entry_safe(h, temp, &s->ls_lru, loh_lru) {
+ start = s->ls_purge_start;
+ bnr = (nr == ~0) ? -1 : nr / CFS_HASH_NBKT(s->ls_obj_hash) + 1;
+ again:
+ did_sth = 0;
+ cfs_hash_for_each_bucket(s->ls_obj_hash, &bd, i) {
+ if (i < start)
+ continue;
+ count = bnr;
+ cfs_hash_bd_lock(s->ls_obj_hash, &bd, 1);
+ bkt = cfs_hash_bd_extra_get(s->ls_obj_hash, &bd);
+
+ cfs_list_for_each_entry_safe(h, temp, &bkt->lsb_lru, loh_lru) {
+ LASSERT(cfs_atomic_read(&h->loh_ref) == 0);
+
+ cfs_hash_bd_get(s->ls_obj_hash, &h->loh_fid, &bd2);
+ LASSERT(bd.bd_bucket == bd2.bd_bucket);
+
+ cfs_hash_bd_del_locked(s->ls_obj_hash,
+ &bd2, &h->loh_hash);
+ cfs_list_move(&h->loh_lru, &dispose);
+ if (did_sth == 0)
+ did_sth = 1;
+
+ if (nr != ~0 && --nr == 0)
+ break;
+
+ if (count > 0 && --count == 0)
+ break;
+
+ }
+ cfs_hash_bd_unlock(s->ls_obj_hash, &bd, 1);
+ cfs_cond_resched();
/*
- * Objects are sorted in lru order, and "busy" objects (ones
- * with h->loh_ref > 0) naturally tend to live near hot end
- * that we scan last. Unfortunately, sites usually have small
- * (less then ten) number of busy yet rarely accessed objects
- * (some global objects, accessed directly through pointers,
- * bypassing hash table). Currently algorithm scans them over
- * and over again. Probably we should move busy objects out of
- * LRU, or we can live with that.
+ * Free everything on the dispose list. This is safe against
+ * races due to the reasons described in lu_object_put().
*/
- if (nr-- == 0)
+ while (!cfs_list_empty(&dispose)) {
+ h = container_of0(dispose.next,
+ struct lu_object_header, loh_lru);
+ cfs_list_del_init(&h->loh_lru);
+ lu_object_free(env, lu_object_top(h));
+ lprocfs_counter_incr(s->ls_stats, LU_SS_LRU_PURGED);
+ }
+
+ if (nr == 0)
break;
- if (atomic_read(&h->loh_ref) > 0)
- continue;
- hlist_del_init(&h->loh_hash);
- list_move(&h->loh_lru, &dispose);
- s->ls_total --;
}
- write_unlock(&s->ls_guard);
- /*
- * Free everything on the dispose list. This is safe against races due
- * to the reasons described in lu_object_put().
- */
- while (!list_empty(&dispose)) {
- h = container_of0(dispose.next,
- struct lu_object_header, loh_lru);
- list_del_init(&h->loh_lru);
- lu_object_free(env, lu_object_top(h));
- s->ls_stats.s_lru_purged ++;
+
+ if (nr != 0 && did_sth && start != 0) {
+ start = 0; /* restart from the first bucket */
+ goto again;
}
+ /* race on s->ls_purge_start, but nobody cares */
+ s->ls_purge_start = i % CFS_HASH_NBKT(s->ls_obj_hash);
+
return nr;
}
EXPORT_SYMBOL(lu_site_purge);
*
* XXX overflow is not handled correctly.
*/
- LU_CDEBUG_LINE = 256
+ LU_CDEBUG_LINE = 512
};
struct lu_cdebug_data {
* lu_global_init().
*/
struct lu_context_key lu_global_key = {
- .lct_tags = LCT_MD_THREAD|LCT_DT_THREAD|LCT_CL_THREAD,
+ .lct_tags = LCT_MD_THREAD | LCT_DT_THREAD |
+ LCT_MG_THREAD | LCT_CL_THREAD,
.lct_init = lu_global_key_init,
.lct_fini = lu_global_key_fini
};
int lu_cdebug_printer(const struct lu_env *env,
void *cookie, const char *format, ...)
{
- struct lu_cdebug_print_info *info = cookie;
- struct lu_cdebug_data *key;
+ struct libcfs_debug_msg_data *msgdata = cookie;
+ struct lu_cdebug_data *key;
int used;
int complete;
- va_list args;
+ va_list args;
va_start(args, format);
vsnprintf(key->lck_area + used,
ARRAY_SIZE(key->lck_area) - used, format, args);
if (complete) {
- libcfs_debug_msg(NULL, info->lpi_subsys, info->lpi_mask,
- (char *)info->lpi_file, info->lpi_fn,
- info->lpi_line, "%s", key->lck_area);
+ if (cfs_cdebug_show(msgdata->msg_mask, msgdata->msg_subsys))
+ libcfs_debug_msg(msgdata, "%s", key->lck_area);
key->lck_area[0] = 0;
}
va_end(args);
}
EXPORT_SYMBOL(lu_cdebug_printer);
-/*
+/**
* Print object header.
*/
-static void lu_object_header_print(const struct lu_env *env,
- void *cookie, lu_printer_t printer,
- const struct lu_object_header *hdr)
+void lu_object_header_print(const struct lu_env *env, void *cookie,
+ lu_printer_t printer,
+ const struct lu_object_header *hdr)
{
(*printer)(env, cookie, "header@%p[%#lx, %d, "DFID"%s%s%s]",
- hdr, hdr->loh_flags, atomic_read(&hdr->loh_ref),
+ hdr, hdr->loh_flags, cfs_atomic_read(&hdr->loh_ref),
PFID(&hdr->loh_fid),
- hlist_unhashed(&hdr->loh_hash) ? "" : " hash",
- list_empty(&hdr->loh_lru) ? "" : " lru",
+ cfs_hlist_unhashed(&hdr->loh_hash) ? "" : " hash",
+ cfs_list_empty((cfs_list_t *)&hdr->loh_lru) ? \
+ "" : " lru",
hdr->loh_attr & LOHA_EXISTS ? " exist":"");
}
+EXPORT_SYMBOL(lu_object_header_print);
-/*
- * Print human readable representation of the @o to the @printer.
+/**
+ * Print human readable representation of the \a o to the \a printer.
*/
void lu_object_print(const struct lu_env *env, void *cookie,
lu_printer_t printer, const struct lu_object *o)
top = o->lo_header;
lu_object_header_print(env, cookie, printer, top);
- (*printer)(env, cookie, "\n");
- list_for_each_entry(o, &top->loh_layers, lo_linkage) {
+ (*printer)(env, cookie, "{ \n");
+ cfs_list_for_each_entry(o, &top->loh_layers, lo_linkage) {
depth = o->lo_depth + 4;
- LASSERT(o->lo_ops->loo_object_print != NULL);
+
/*
- * print `.' @depth times.
+ * print `.' \a depth times followed by type name and address
*/
- (*printer)(env, cookie, "%*.*s", depth, depth, ruler);
- o->lo_ops->loo_object_print(env, cookie, printer, o);
+ (*printer)(env, cookie, "%*.*s%s@%p", depth, depth, ruler,
+ o->lo_dev->ld_type->ldt_name, o);
+ if (o->lo_ops->loo_object_print != NULL)
+ o->lo_ops->loo_object_print(env, cookie, printer, o);
(*printer)(env, cookie, "\n");
}
+ (*printer)(env, cookie, "} header@%p\n", top);
}
EXPORT_SYMBOL(lu_object_print);
-/*
+/**
* Check object consistency.
*/
int lu_object_invariant(const struct lu_object *o)
struct lu_object_header *top;
top = o->lo_header;
- list_for_each_entry(o, &top->loh_layers, lo_linkage) {
+ cfs_list_for_each_entry(o, &top->loh_layers, lo_linkage) {
if (o->lo_ops->loo_object_invariant != NULL &&
!o->lo_ops->loo_object_invariant(o))
return 0;
EXPORT_SYMBOL(lu_object_invariant);
static struct lu_object *htable_lookup(struct lu_site *s,
- const struct hlist_head *bucket,
- const struct lu_fid *f)
+ cfs_hash_bd_t *bd,
+ const struct lu_fid *f,
+ cfs_waitlink_t *waiter,
+ __u64 *version)
{
+ struct lu_site_bkt_data *bkt;
struct lu_object_header *h;
- struct hlist_node *scan;
-
- hlist_for_each_entry(h, scan, bucket, loh_hash) {
- s->ls_stats.s_cache_check ++;
- if (likely(lu_fid_eq(&h->loh_fid, f) &&
- !lu_object_is_dying(h))) {
- /* bump reference count... */
- if (atomic_add_return(1, &h->loh_ref) == 1)
- ++ s->ls_busy;
- /* and move to the head of the LRU */
- /*
- * XXX temporary disable this to measure effects of
- * read-write locking.
- */
- /* list_move_tail(&h->loh_lru, &s->ls_lru); */
- s->ls_stats.s_cache_hit ++;
- return lu_object_top(h);
- }
+ cfs_hlist_node_t *hnode;
+ __u64 ver = cfs_hash_bd_version_get(bd);
+
+ if (*version == ver)
+ return NULL;
+
+ *version = ver;
+ bkt = cfs_hash_bd_extra_get(s->ls_obj_hash, bd);
+ /* cfs_hash_bd_peek_locked is a somehow "internal" function
+ * of cfs_hash, it doesn't add refcount on object. */
+ hnode = cfs_hash_bd_peek_locked(s->ls_obj_hash, bd, (void *)f);
+ if (hnode == NULL) {
+ lprocfs_counter_incr(s->ls_stats, LU_SS_CACHE_MISS);
+ return NULL;
}
- s->ls_stats.s_cache_miss ++;
- return NULL;
+
+ h = container_of0(hnode, struct lu_object_header, loh_hash);
+ if (likely(!lu_object_is_dying(h))) {
+ cfs_hash_get(s->ls_obj_hash, hnode);
+ lprocfs_counter_incr(s->ls_stats, LU_SS_CACHE_HIT);
+ cfs_list_del_init(&h->loh_lru);
+ return lu_object_top(h);
+ }
+
+ /*
+ * Lookup found an object being destroyed this object cannot be
+ * returned (to assure that references to dying objects are eventually
+ * drained), and moreover, lookup has to wait until object is freed.
+ */
+
+ cfs_waitlink_init(waiter);
+ cfs_waitq_add(&bkt->lsb_marche_funebre, waiter);
+ cfs_set_current_state(CFS_TASK_UNINT);
+ lprocfs_counter_incr(s->ls_stats, LU_SS_CACHE_DEATH_RACE);
+ return ERR_PTR(-EAGAIN);
}
-static __u32 fid_hash(const struct lu_fid *f, int bits)
+/**
+ * Search cache for an object with the fid \a f. If such object is found,
+ * return it. Otherwise, create new object, insert it into cache and return
+ * it. In any case, additional reference is acquired on the returned object.
+ */
+struct lu_object *lu_object_find(const struct lu_env *env,
+ struct lu_device *dev, const struct lu_fid *f,
+ const struct lu_object_conf *conf)
{
- /* all objects with same id and different versions will belong to same
- * collisions list. */
- return hash_long(fid_flatten(f), bits);
+ return lu_object_find_at(env, dev->ld_site->ls_top_dev, f, conf);
}
+EXPORT_SYMBOL(lu_object_find);
-/*
- * Search cache for an object with the fid @f. If such object is found, return
- * it. Otherwise, create new object, insert it into cache and return it. In
- * any case, additional reference is acquired on the returned object.
+static struct lu_object *lu_object_new(const struct lu_env *env,
+ struct lu_device *dev,
+ const struct lu_fid *f,
+ const struct lu_object_conf *conf)
+{
+ struct lu_object *o;
+ cfs_hash_t *hs;
+ cfs_hash_bd_t bd;
+ struct lu_site_bkt_data *bkt;
+
+ o = lu_object_alloc(env, dev, f, conf);
+ if (unlikely(IS_ERR(o)))
+ return o;
+
+ hs = dev->ld_site->ls_obj_hash;
+ cfs_hash_bd_get_and_lock(hs, (void *)f, &bd, 1);
+ bkt = cfs_hash_bd_extra_get(hs, &bd);
+ cfs_hash_bd_add_locked(hs, &bd, &o->lo_header->loh_hash);
+ bkt->lsb_busy++;
+ cfs_hash_bd_unlock(hs, &bd, 1);
+ return o;
+}
+
+/**
+ * Core logic of lu_object_find*() functions.
*/
-struct lu_object *lu_object_find(const struct lu_env *env,
- struct lu_site *s, const struct lu_fid *f)
+static struct lu_object *lu_object_find_try(const struct lu_env *env,
+ struct lu_device *dev,
+ const struct lu_fid *f,
+ const struct lu_object_conf *conf,
+ cfs_waitlink_t *waiter)
{
- struct lu_object *o;
- struct lu_object *shadow;
- struct hlist_head *bucket;
+ struct lu_object *o;
+ struct lu_object *shadow;
+ struct lu_site *s;
+ cfs_hash_t *hs;
+ cfs_hash_bd_t bd;
+ __u64 version = 0;
/*
* This uses standard index maintenance protocol:
* object just allocated.
* - unlock index;
* - return object.
+ *
+ * For "LOC_F_NEW" case, we are sure the object is new established.
+ * It is unnecessary to perform lookup-alloc-lookup-insert, instead,
+ * just alloc and insert directly.
+ *
+ * If dying object is found during index search, add @waiter to the
+ * site wait-queue and return ERR_PTR(-EAGAIN).
*/
-
- bucket = s->ls_hash + fid_hash(f, s->ls_hash_bits);
-
- read_lock(&s->ls_guard);
- o = htable_lookup(s, bucket, f);
- read_unlock(&s->ls_guard);
-
+ if (conf != NULL && conf->loc_flags & LOC_F_NEW)
+ return lu_object_new(env, dev, f, conf);
+
+ s = dev->ld_site;
+ hs = s->ls_obj_hash;
+ cfs_hash_bd_get_and_lock(hs, (void *)f, &bd, 1);
+ o = htable_lookup(s, &bd, f, waiter, &version);
+ cfs_hash_bd_unlock(hs, &bd, 1);
if (o != NULL)
return o;
* Allocate new object. This may result in rather complicated
* operations, including fld queries, inode loading, etc.
*/
- o = lu_object_alloc(env, s, f);
+ o = lu_object_alloc(env, dev, f, conf);
if (unlikely(IS_ERR(o)))
return o;
LASSERT(lu_fid_eq(lu_object_fid(o), f));
- write_lock(&s->ls_guard);
- shadow = htable_lookup(s, bucket, f);
+ cfs_hash_bd_lock(hs, &bd, 1);
+
+ shadow = htable_lookup(s, &bd, f, waiter, &version);
if (likely(shadow == NULL)) {
- hlist_add_head(&o->lo_header->loh_hash, bucket);
- list_add_tail(&o->lo_header->loh_lru, &s->ls_lru);
- ++ s->ls_busy;
- ++ s->ls_total;
- shadow = o;
- o = NULL;
- } else
- s->ls_stats.s_cache_race ++;
- write_unlock(&s->ls_guard);
- if (o != NULL)
- lu_object_free(env, o);
+ struct lu_site_bkt_data *bkt;
+
+ bkt = cfs_hash_bd_extra_get(hs, &bd);
+ cfs_hash_bd_add_locked(hs, &bd, &o->lo_header->loh_hash);
+ bkt->lsb_busy++;
+ cfs_hash_bd_unlock(hs, &bd, 1);
+ return o;
+ }
+
+ lprocfs_counter_incr(s->ls_stats, LU_SS_CACHE_RACE);
+ cfs_hash_bd_unlock(hs, &bd, 1);
+ lu_object_free(env, o);
return shadow;
}
-EXPORT_SYMBOL(lu_object_find);
-/*
+/**
+ * Much like lu_object_find(), but top level device of object is specifically
+ * \a dev rather than top level device of the site. This interface allows
+ * objects of different "stacking" to be created within the same site.
+ */
+struct lu_object *lu_object_find_at(const struct lu_env *env,
+ struct lu_device *dev,
+ const struct lu_fid *f,
+ const struct lu_object_conf *conf)
+{
+ struct lu_site_bkt_data *bkt;
+ struct lu_object *obj;
+ cfs_waitlink_t wait;
+
+ while (1) {
+ obj = lu_object_find_try(env, dev, f, conf, &wait);
+ if (obj != ERR_PTR(-EAGAIN))
+ return obj;
+ /*
+ * lu_object_find_try() already added waiter into the
+ * wait queue.
+ */
+ cfs_waitq_wait(&wait, CFS_TASK_UNINT);
+ bkt = lu_site_bkt_from_fid(dev->ld_site, (void *)f);
+ cfs_waitq_del(&bkt->lsb_marche_funebre, &wait);
+ }
+}
+EXPORT_SYMBOL(lu_object_find_at);
+
+/**
+ * Find object with given fid, and return its slice belonging to given device.
+ */
+struct lu_object *lu_object_find_slice(const struct lu_env *env,
+ struct lu_device *dev,
+ const struct lu_fid *f,
+ const struct lu_object_conf *conf)
+{
+ struct lu_object *top;
+ struct lu_object *obj;
+
+ top = lu_object_find(env, dev, f, conf);
+ if (!IS_ERR(top)) {
+ obj = lu_object_locate(top->lo_header, dev->ld_type);
+ if (obj == NULL)
+ lu_object_put(env, top);
+ } else
+ obj = top;
+ return obj;
+}
+EXPORT_SYMBOL(lu_object_find_slice);
+
/**
* Global list of all device types.
*/
int lu_device_type_init(struct lu_device_type *ldt)
{
- int result;
-
- CFS_INIT_LIST_HEAD(&ldt->ldt_linkage);
- result = ldt->ldt_ops->ldto_init(ldt);
- if (result == 0)
- list_add(&ldt->ldt_linkage, &lu_device_types);
- return result;
+ int result = 0;
+
+ CFS_INIT_LIST_HEAD(&ldt->ldt_linkage);
+ if (ldt->ldt_ops->ldto_init)
+ result = ldt->ldt_ops->ldto_init(ldt);
+ if (result == 0)
+ cfs_list_add(&ldt->ldt_linkage, &lu_device_types);
+ return result;
}
EXPORT_SYMBOL(lu_device_type_init);
void lu_device_type_fini(struct lu_device_type *ldt)
{
- list_del_init(&ldt->ldt_linkage);
- ldt->ldt_ops->ldto_fini(ldt);
+ cfs_list_del_init(&ldt->ldt_linkage);
+ if (ldt->ldt_ops->ldto_fini)
+ ldt->ldt_ops->ldto_fini(ldt);
}
EXPORT_SYMBOL(lu_device_type_fini);
{
struct lu_device_type *ldt;
- list_for_each_entry(ldt, &lu_device_types, ldt_linkage) {
- if (ldt->ldt_device_nr == 0)
- ldt->ldt_ops->ldto_stop(ldt);
- }
+ cfs_list_for_each_entry(ldt, &lu_device_types, ldt_linkage) {
+ if (ldt->ldt_device_nr == 0 && ldt->ldt_ops->ldto_stop)
+ ldt->ldt_ops->ldto_stop(ldt);
+ }
}
EXPORT_SYMBOL(lu_types_stop);
* Global list of all sites on this node
*/
static CFS_LIST_HEAD(lu_sites);
-static DECLARE_MUTEX(lu_sites_guard);
+static DEFINE_MUTEX(lu_sites_guard);
/**
* Global environment used by site shrinker.
*/
static struct lu_env lu_shrink_env;
+struct lu_site_print_arg {
+ struct lu_env *lsp_env;
+ void *lsp_cookie;
+ lu_printer_t lsp_printer;
+};
+
+static int
+lu_site_obj_print(cfs_hash_t *hs, cfs_hash_bd_t *bd,
+ cfs_hlist_node_t *hnode, void *data)
+{
+ struct lu_site_print_arg *arg = (struct lu_site_print_arg *)data;
+ struct lu_object_header *h;
+
+ h = cfs_hlist_entry(hnode, struct lu_object_header, loh_hash);
+ if (!cfs_list_empty(&h->loh_layers)) {
+ const struct lu_object *o;
+
+ o = lu_object_top(h);
+ lu_object_print(arg->lsp_env, arg->lsp_cookie,
+ arg->lsp_printer, o);
+ } else {
+ lu_object_header_print(arg->lsp_env, arg->lsp_cookie,
+ arg->lsp_printer, h);
+ }
+ return 0;
+}
+
/**
* Print all objects in \a s.
*/
void lu_site_print(const struct lu_env *env, struct lu_site *s, void *cookie,
lu_printer_t printer)
{
- int i;
-
- for (i = 0; i < s->ls_hash_size; ++i) {
- struct lu_object_header *h;
- struct hlist_node *scan;
-
- read_lock(&s->ls_guard);
- hlist_for_each_entry(h, scan, &s->ls_hash[i], loh_hash) {
+ struct lu_site_print_arg arg = {
+ .lsp_env = (struct lu_env *)env,
+ .lsp_cookie = cookie,
+ .lsp_printer = printer,
+ };
- if (!list_empty(&h->loh_layers)) {
- const struct lu_object *obj;
-
- obj = lu_object_top(h);
- lu_object_print(env, cookie, printer, obj);
- } else
- lu_object_header_print(env, cookie, printer, h);
- }
- read_unlock(&s->ls_guard);
- }
+ cfs_hash_for_each(s->ls_obj_hash, lu_site_obj_print, &arg);
}
EXPORT_SYMBOL(lu_site_print);
enum {
- LU_CACHE_PERCENT = 20,
+ LU_CACHE_PERCENT_MAX = 50,
+ LU_CACHE_PERCENT_DEFAULT = 20
};
-/*
+static unsigned int lu_cache_percent = LU_CACHE_PERCENT_DEFAULT;
+CFS_MODULE_PARM(lu_cache_percent, "i", int, 0644,
+ "Percentage of memory to be used as lu_object cache");
+
+/**
* Return desired hash table order.
*/
static int lu_htable_order(void)
*
* Size of lu_object is (arbitrary) taken as 1K (together with inode).
*/
- cache_size = num_physpages;
+ cache_size = cfs_num_physpages;
#if BITS_PER_LONG == 32
/* limit hashtable size for lowmem systems to low RAM */
cache_size = 1 << (30 - CFS_PAGE_SHIFT) * 3 / 4;
#endif
- cache_size = cache_size / 100 * LU_CACHE_PERCENT *
+ /* clear off unreasonable cache setting. */
+ if (lu_cache_percent == 0 || lu_cache_percent > LU_CACHE_PERCENT_MAX) {
+ CWARN("obdclass: invalid lu_cache_percent: %u, it must be in"
+ " the range of (0, %u]. Will use default value: %u.\n",
+ lu_cache_percent, LU_CACHE_PERCENT_MAX,
+ LU_CACHE_PERCENT_DEFAULT);
+
+ lu_cache_percent = LU_CACHE_PERCENT_DEFAULT;
+ }
+ cache_size = cache_size / 100 * lu_cache_percent *
(CFS_PAGE_SIZE / 1024);
for (bits = 1; (1 << bits) < cache_size; ++bits) {
return bits;
}
-/*
- * Initialize site @s, with @d as the top level device.
+static unsigned lu_obj_hop_hash(cfs_hash_t *hs,
+ const void *key, unsigned mask)
+{
+ struct lu_fid *fid = (struct lu_fid *)key;
+ __u32 hash;
+
+ hash = fid_flatten32(fid);
+ hash += (hash >> 4) + (hash << 12); /* mixing oid and seq */
+ hash = cfs_hash_long(hash, hs->hs_bkt_bits);
+
+ /* give me another random factor */
+ hash -= cfs_hash_long((unsigned long)hs, fid_oid(fid) % 11 + 3);
+
+ hash <<= hs->hs_cur_bits - hs->hs_bkt_bits;
+ hash |= (fid_seq(fid) + fid_oid(fid)) & (CFS_HASH_NBKT(hs) - 1);
+
+ return hash & mask;
+}
+
+static void *lu_obj_hop_object(cfs_hlist_node_t *hnode)
+{
+ return cfs_hlist_entry(hnode, struct lu_object_header, loh_hash);
+}
+
+static void *lu_obj_hop_key(cfs_hlist_node_t *hnode)
+{
+ struct lu_object_header *h;
+
+ h = cfs_hlist_entry(hnode, struct lu_object_header, loh_hash);
+ return &h->loh_fid;
+}
+
+static int lu_obj_hop_keycmp(const void *key, cfs_hlist_node_t *hnode)
+{
+ struct lu_object_header *h;
+
+ h = cfs_hlist_entry(hnode, struct lu_object_header, loh_hash);
+ return lu_fid_eq(&h->loh_fid, (struct lu_fid *)key);
+}
+
+static void lu_obj_hop_get(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
+{
+ struct lu_object_header *h;
+
+ h = cfs_hlist_entry(hnode, struct lu_object_header, loh_hash);
+ if (cfs_atomic_add_return(1, &h->loh_ref) == 1) {
+ struct lu_site_bkt_data *bkt;
+ cfs_hash_bd_t bd;
+
+ cfs_hash_bd_get(hs, &h->loh_fid, &bd);
+ bkt = cfs_hash_bd_extra_get(hs, &bd);
+ bkt->lsb_busy++;
+ }
+}
+
+static void lu_obj_hop_put_locked(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
+{
+ LBUG(); /* we should never called it */
+}
+
+cfs_hash_ops_t lu_site_hash_ops = {
+ .hs_hash = lu_obj_hop_hash,
+ .hs_key = lu_obj_hop_key,
+ .hs_keycmp = lu_obj_hop_keycmp,
+ .hs_object = lu_obj_hop_object,
+ .hs_get = lu_obj_hop_get,
+ .hs_put_locked = lu_obj_hop_put_locked,
+};
+
+void lu_dev_add_linkage(struct lu_site *s, struct lu_device *d)
+{
+ spin_lock(&s->ls_ld_lock);
+ if (cfs_list_empty(&d->ld_linkage))
+ cfs_list_add(&d->ld_linkage, &s->ls_ld_linkage);
+ spin_unlock(&s->ls_ld_lock);
+}
+EXPORT_SYMBOL(lu_dev_add_linkage);
+
+void lu_dev_del_linkage(struct lu_site *s, struct lu_device *d)
+{
+ spin_lock(&s->ls_ld_lock);
+ cfs_list_del_init(&d->ld_linkage);
+ spin_unlock(&s->ls_ld_lock);
+}
+EXPORT_SYMBOL(lu_dev_del_linkage);
+
+/**
+ * Initialize site \a s, with \a d as the top level device.
+ */
+#define LU_SITE_BITS_MIN 12
+#define LU_SITE_BITS_MAX 24
+/**
+ * total 256 buckets, we don't want too many buckets because:
+ * - consume too much memory
+ * - avoid unbalanced LRU list
*/
+#define LU_SITE_BKT_BITS 8
+
int lu_site_init(struct lu_site *s, struct lu_device *top)
{
+ struct lu_site_bkt_data *bkt;
+ cfs_hash_bd_t bd;
+ char name[16];
int bits;
- int size;
int i;
ENTRY;
memset(s, 0, sizeof *s);
- rwlock_init(&s->ls_guard);
- CFS_INIT_LIST_HEAD(&s->ls_lru);
+ bits = lu_htable_order();
+ snprintf(name, 16, "lu_site_%s", top->ld_type->ldt_name);
+ for (bits = min(max(LU_SITE_BITS_MIN, bits), LU_SITE_BITS_MAX);
+ bits >= LU_SITE_BITS_MIN; bits--) {
+ s->ls_obj_hash = cfs_hash_create(name, bits, bits,
+ bits - LU_SITE_BKT_BITS,
+ sizeof(*bkt), 0, 0,
+ &lu_site_hash_ops,
+ CFS_HASH_SPIN_BKTLOCK |
+ CFS_HASH_NO_ITEMREF |
+ CFS_HASH_DEPTH |
+ CFS_HASH_ASSERT_EMPTY);
+ if (s->ls_obj_hash != NULL)
+ break;
+ }
+
+ if (s->ls_obj_hash == NULL) {
+ CERROR("failed to create lu_site hash with bits: %d\n", bits);
+ return -ENOMEM;
+ }
+
+ cfs_hash_for_each_bucket(s->ls_obj_hash, &bd, i) {
+ bkt = cfs_hash_bd_extra_get(s->ls_obj_hash, &bd);
+ CFS_INIT_LIST_HEAD(&bkt->lsb_lru);
+ cfs_waitq_init(&bkt->lsb_marche_funebre);
+ }
+
+ s->ls_stats = lprocfs_alloc_stats(LU_SS_LAST_STAT, 0);
+ if (s->ls_stats == NULL) {
+ cfs_hash_putref(s->ls_obj_hash);
+ s->ls_obj_hash = NULL;
+ return -ENOMEM;
+ }
+
+ lprocfs_counter_init(s->ls_stats, LU_SS_CREATED,
+ 0, "created", "created");
+ lprocfs_counter_init(s->ls_stats, LU_SS_CACHE_HIT,
+ 0, "cache_hit", "cache_hit");
+ lprocfs_counter_init(s->ls_stats, LU_SS_CACHE_MISS,
+ 0, "cache_miss", "cache_miss");
+ lprocfs_counter_init(s->ls_stats, LU_SS_CACHE_RACE,
+ 0, "cache_race", "cache_race");
+ lprocfs_counter_init(s->ls_stats, LU_SS_CACHE_DEATH_RACE,
+ 0, "cache_death_race", "cache_death_race");
+ lprocfs_counter_init(s->ls_stats, LU_SS_LRU_PURGED,
+ 0, "lru_purged", "lru_purged");
+
CFS_INIT_LIST_HEAD(&s->ls_linkage);
s->ls_top_dev = top;
top->ld_site = s;
lu_device_get(top);
+ lu_ref_add(&top->ld_reference, "site-top", s);
- for (bits = lu_htable_order(), size = 1 << bits;
- (s->ls_hash =
- cfs_alloc_large(size * sizeof s->ls_hash[0])) == NULL;
- --bits, size >>= 1) {
- /*
- * Scale hash table down, until allocation succeeds.
- */
- ;
- }
-
- s->ls_hash_size = size;
- s->ls_hash_bits = bits;
- s->ls_hash_mask = size - 1;
+ CFS_INIT_LIST_HEAD(&s->ls_ld_linkage);
+ spin_lock_init(&s->ls_ld_lock);
- for (i = 0; i < size; i++)
- INIT_HLIST_HEAD(&s->ls_hash[i]);
+ lu_dev_add_linkage(s, top);
- RETURN(0);
+ RETURN(0);
}
EXPORT_SYMBOL(lu_site_init);
-/*
- * Finalize @s and release its resources.
+/**
+ * Finalize \a s and release its resources.
*/
void lu_site_fini(struct lu_site *s)
{
- LASSERT(list_empty(&s->ls_lru));
- LASSERT(s->ls_total == 0);
-
- down(&lu_sites_guard);
- list_del_init(&s->ls_linkage);
- up(&lu_sites_guard);
+ mutex_lock(&lu_sites_guard);
+ cfs_list_del_init(&s->ls_linkage);
+ mutex_unlock(&lu_sites_guard);
- if (s->ls_hash != NULL) {
- int i;
- for (i = 0; i < s->ls_hash_size; i++)
- LASSERT(hlist_empty(&s->ls_hash[i]));
- cfs_free_large(s->ls_hash);
- s->ls_hash = NULL;
+ if (s->ls_obj_hash != NULL) {
+ cfs_hash_putref(s->ls_obj_hash);
+ s->ls_obj_hash = NULL;
}
+
if (s->ls_top_dev != NULL) {
s->ls_top_dev->ld_site = NULL;
+ lu_ref_del(&s->ls_top_dev->ld_reference, "site-top", s);
lu_device_put(s->ls_top_dev);
s->ls_top_dev = NULL;
}
+
+ if (s->ls_stats != NULL)
+ lprocfs_free_stats(&s->ls_stats);
}
EXPORT_SYMBOL(lu_site_fini);
-/*
+/**
* Called when initialization of stack for this site is completed.
*/
int lu_site_init_finish(struct lu_site *s)
{
int result;
- down(&lu_sites_guard);
+ mutex_lock(&lu_sites_guard);
result = lu_context_refill(&lu_shrink_env.le_ctx);
if (result == 0)
- list_add(&s->ls_linkage, &lu_sites);
- up(&lu_sites_guard);
+ cfs_list_add(&s->ls_linkage, &lu_sites);
+ mutex_unlock(&lu_sites_guard);
return result;
}
EXPORT_SYMBOL(lu_site_init_finish);
*/
void lu_device_get(struct lu_device *d)
{
- atomic_inc(&d->ld_ref);
+ cfs_atomic_inc(&d->ld_ref);
}
EXPORT_SYMBOL(lu_device_get);
*/
void lu_device_put(struct lu_device *d)
{
- LASSERT(atomic_read(&d->ld_ref) > 0);
- atomic_dec(&d->ld_ref);
+ LASSERT(cfs_atomic_read(&d->ld_ref) > 0);
+ cfs_atomic_dec(&d->ld_ref);
}
EXPORT_SYMBOL(lu_device_put);
if (t->ldt_device_nr++ == 0 && t->ldt_ops->ldto_start != NULL)
t->ldt_ops->ldto_start(t);
memset(d, 0, sizeof *d);
- atomic_set(&d->ld_ref, 0);
+ cfs_atomic_set(&d->ld_ref, 0);
d->ld_type = t;
lu_ref_init(&d->ld_reference);
+ CFS_INIT_LIST_HEAD(&d->ld_linkage);
return 0;
}
EXPORT_SYMBOL(lu_device_init);
struct lu_device_type *t;
t = d->ld_type;
- if (d->ld_obd != NULL)
- /* finish lprocfs */
- lprocfs_obd_cleanup(d->ld_obd);
+ if (d->ld_obd != NULL) {
+ d->ld_obd->obd_lu_dev = NULL;
+ d->ld_obd = NULL;
+ }
lu_ref_fini(&d->ld_reference);
- LASSERTF(atomic_read(&d->ld_ref) == 0,
- "Refcount is %u\n", atomic_read(&d->ld_ref));
+ LASSERTF(cfs_atomic_read(&d->ld_ref) == 0,
+ "Refcount is %u\n", cfs_atomic_read(&d->ld_ref));
LASSERT(t->ldt_device_nr > 0);
if (--t->ldt_device_nr == 0 && t->ldt_ops->ldto_stop != NULL)
t->ldt_ops->ldto_stop(t);
o->lo_header = h;
o->lo_dev = d;
lu_device_get(d);
+ o->lo_dev_ref = lu_ref_add(&d->ld_reference, "lu_object", o);
CFS_INIT_LIST_HEAD(&o->lo_linkage);
return 0;
}
EXPORT_SYMBOL(lu_object_init);
-/*
+/**
* Finalize object and release its resources.
*/
void lu_object_fini(struct lu_object *o)
{
- LASSERT(list_empty(&o->lo_linkage));
+ struct lu_device *dev = o->lo_dev;
+
+ LASSERT(cfs_list_empty(&o->lo_linkage));
- if (o->lo_dev != NULL) {
- lu_device_put(o->lo_dev);
+ if (dev != NULL) {
+ lu_ref_del_at(&dev->ld_reference,
+ o->lo_dev_ref , "lu_object", o);
+ lu_device_put(dev);
o->lo_dev = NULL;
}
}
EXPORT_SYMBOL(lu_object_fini);
-/*
- * Add object @o as first layer of compound object @h
+/**
+ * Add object \a o as first layer of compound object \a h
*
* This is typically called by the ->ldo_object_alloc() method of top-level
* device.
*/
void lu_object_add_top(struct lu_object_header *h, struct lu_object *o)
{
- list_move(&o->lo_linkage, &h->loh_layers);
+ cfs_list_move(&o->lo_linkage, &h->loh_layers);
}
EXPORT_SYMBOL(lu_object_add_top);
*/
void lu_object_add(struct lu_object *before, struct lu_object *o)
{
- list_move(&o->lo_linkage, &before->lo_linkage);
+ cfs_list_move(&o->lo_linkage, &before->lo_linkage);
}
EXPORT_SYMBOL(lu_object_add);
int lu_object_header_init(struct lu_object_header *h)
{
memset(h, 0, sizeof *h);
- atomic_set(&h->loh_ref, 1);
- INIT_HLIST_NODE(&h->loh_hash);
+ cfs_atomic_set(&h->loh_ref, 1);
+ CFS_INIT_HLIST_NODE(&h->loh_hash);
CFS_INIT_LIST_HEAD(&h->loh_lru);
CFS_INIT_LIST_HEAD(&h->loh_layers);
+ lu_ref_init(&h->loh_reference);
return 0;
}
EXPORT_SYMBOL(lu_object_header_init);
-/*
+/**
* Finalize compound object.
*/
void lu_object_header_fini(struct lu_object_header *h)
{
- LASSERT(list_empty(&h->loh_layers));
- LASSERT(list_empty(&h->loh_lru));
- LASSERT(hlist_unhashed(&h->loh_hash));
+ LASSERT(cfs_list_empty(&h->loh_layers));
+ LASSERT(cfs_list_empty(&h->loh_lru));
+ LASSERT(cfs_hlist_unhashed(&h->loh_hash));
+ lu_ref_fini(&h->loh_reference);
}
EXPORT_SYMBOL(lu_object_header_fini);
-/*
+/**
* Given a compound object, find its slice, corresponding to the device type
- * @dtype.
+ * \a dtype.
*/
struct lu_object *lu_object_locate(struct lu_object_header *h,
- struct lu_device_type *dtype)
+ const struct lu_device_type *dtype)
{
struct lu_object *o;
- list_for_each_entry(o, &h->loh_layers, lo_linkage) {
+ cfs_list_for_each_entry(o, &h->loh_layers, lo_linkage) {
if (o->lo_dev->ld_type == dtype)
return o;
}
-/*
+/**
* Finalize and free devices in the device stack.
- *
+ *
* Finalize device stack by purging object cache, and calling
* lu_device_type_operations::ldto_device_fini() and
* lu_device_type_operations::ldto_device_free() on all devices in the stack.
lu_site_purge(env, site, ~0);
for (scan = top; scan != NULL; scan = next) {
next = scan->ld_type->ldt_ops->ldto_device_fini(env, scan);
+ lu_ref_del(&scan->ld_reference, "lu-stack", &lu_site_init);
lu_device_put(scan);
}
/* purge again. */
lu_site_purge(env, site, ~0);
- if (!list_empty(&site->ls_lru) || site->ls_total != 0) {
- /*
- * Uh-oh, objects still exist.
- */
- static DECLARE_LU_CDEBUG_PRINT_INFO(cookie, D_ERROR);
-
- lu_site_print(env, site, &cookie, lu_cdebug_printer);
- }
-
for (scan = top; scan != NULL; scan = next) {
const struct lu_device_type *ldt = scan->ld_type;
struct obd_type *type;
next = ldt->ldt_ops->ldto_device_free(env, scan);
type = ldt->ldt_obd_type;
if (type != NULL) {
- type->typ_refcnt--;
- class_put_type(type);
- }
+ type->typ_refcnt--;
+ class_put_type(type);
+ }
}
}
EXPORT_SYMBOL(lu_stack_fini);
/**
* Maximal number of tld slots.
*/
- LU_CONTEXT_KEY_NR = 32
+ LU_CONTEXT_KEY_NR = 40
};
static struct lu_context_key *lu_keys[LU_CONTEXT_KEY_NR] = { NULL, };
-static spinlock_t lu_keys_guard = SPIN_LOCK_UNLOCKED;
+static DEFINE_SPINLOCK(lu_keys_guard);
/**
* Global counter incremented whenever key is registered, unregistered,
LASSERT(key->lct_owner != NULL);
result = -ENFILE;
- spin_lock(&lu_keys_guard);
+ spin_lock(&lu_keys_guard);
for (i = 0; i < ARRAY_SIZE(lu_keys); ++i) {
if (lu_keys[i] == NULL) {
key->lct_index = i;
- atomic_set(&key->lct_used, 1);
+ cfs_atomic_set(&key->lct_used, 1);
lu_keys[i] = key;
lu_ref_init(&key->lct_reference);
result = 0;
break;
}
}
- spin_unlock(&lu_keys_guard);
- return result;
+ spin_unlock(&lu_keys_guard);
+ return result;
}
EXPORT_SYMBOL(lu_context_key_register);
static void key_fini(struct lu_context *ctx, int index)
{
- if (ctx->lc_value[index] != NULL) {
+ if (ctx->lc_value != NULL && ctx->lc_value[index] != NULL) {
struct lu_context_key *key;
key = lu_keys[index];
LASSERT(key != NULL);
LASSERT(key->lct_fini != NULL);
- LASSERT(atomic_read(&key->lct_used) > 1);
+ LASSERT(cfs_atomic_read(&key->lct_used) > 1);
key->lct_fini(ctx, key, ctx->lc_value[index]);
lu_ref_del(&key->lct_reference, "ctx", ctx);
- atomic_dec(&key->lct_used);
- LASSERT(key->lct_owner != NULL);
- if (!(ctx->lc_tags & LCT_NOREF)) {
- LASSERT(module_refcount(key->lct_owner) > 0);
- module_put(key->lct_owner);
- }
- ctx->lc_value[index] = NULL;
- }
+ cfs_atomic_dec(&key->lct_used);
+
+ LASSERT(key->lct_owner != NULL);
+ if ((ctx->lc_tags & LCT_NOREF) == 0) {
+ LINVRNT(cfs_module_refcount(key->lct_owner) > 0);
+ cfs_module_put(key->lct_owner);
+ }
+ ctx->lc_value[index] = NULL;
+ }
}
/**
*/
void lu_context_key_degister(struct lu_context_key *key)
{
- LASSERT(atomic_read(&key->lct_used) >= 1);
- LINVRNT(0 <= key->lct_index && key->lct_index < ARRAY_SIZE(lu_keys));
-
- ++key_set_version;
- key_fini(&lu_shrink_env.le_ctx, key->lct_index);
-
- if (atomic_read(&key->lct_used) > 1)
- CERROR("key has instances.\n");
- spin_lock(&lu_keys_guard);
- lu_keys[key->lct_index] = NULL;
- spin_unlock(&lu_keys_guard);
+ LASSERT(cfs_atomic_read(&key->lct_used) >= 1);
+ LINVRNT(0 <= key->lct_index && key->lct_index < ARRAY_SIZE(lu_keys));
+
+ lu_context_key_quiesce(key);
+
+ ++key_set_version;
+ spin_lock(&lu_keys_guard);
+ key_fini(&lu_shrink_env.le_ctx, key->lct_index);
+ if (lu_keys[key->lct_index]) {
+ lu_keys[key->lct_index] = NULL;
+ lu_ref_fini(&key->lct_reference);
+ }
+ spin_unlock(&lu_keys_guard);
+
+ LASSERTF(cfs_atomic_read(&key->lct_used) == 1,
+ "key has instances: %d\n",
+ cfs_atomic_read(&key->lct_used));
}
EXPORT_SYMBOL(lu_context_key_degister);
{
LINVRNT(ctx->lc_state == LCS_ENTERED);
LINVRNT(0 <= key->lct_index && key->lct_index < ARRAY_SIZE(lu_keys));
+ LASSERT(lu_keys[key->lct_index] == key);
return ctx->lc_value[key->lct_index];
}
EXPORT_SYMBOL(lu_context_key_get);
struct lu_context *ctx;
if (!(key->lct_tags & LCT_QUIESCENT)) {
+ /*
+ * XXX layering violation.
+ */
key->lct_tags |= LCT_QUIESCENT;
/*
* XXX memory barrier has to go here.
*/
- spin_lock(&lu_keys_guard);
- list_for_each_entry(ctx, &lu_context_remembered, lc_remember)
- key_fini(ctx, key->lct_index);
- spin_unlock(&lu_keys_guard);
- ++key_set_version;
- }
+ spin_lock(&lu_keys_guard);
+ cfs_list_for_each_entry(ctx, &lu_context_remembered,
+ lc_remember)
+ key_fini(ctx, key->lct_index);
+ spin_unlock(&lu_keys_guard);
+ ++key_set_version;
+ }
}
EXPORT_SYMBOL(lu_context_key_quiesce);
static void keys_fini(struct lu_context *ctx)
{
- int i;
+ int i;
- if (ctx->lc_value != NULL) {
- for (i = 0; i < ARRAY_SIZE(lu_keys); ++i)
- key_fini(ctx, i);
- OBD_FREE(ctx->lc_value,
- ARRAY_SIZE(lu_keys) * sizeof ctx->lc_value[0]);
- ctx->lc_value = NULL;
- }
+ if (ctx->lc_value == NULL)
+ return;
+
+ for (i = 0; i < ARRAY_SIZE(lu_keys); ++i)
+ key_fini(ctx, i);
+
+ OBD_FREE(ctx->lc_value, ARRAY_SIZE(lu_keys) * sizeof ctx->lc_value[0]);
+ ctx->lc_value = NULL;
}
static int keys_fill(struct lu_context *ctx)
{
int i;
+ LINVRNT(ctx->lc_value != NULL);
for (i = 0; i < ARRAY_SIZE(lu_keys); ++i) {
struct lu_context_key *key;
value = key->lct_init(ctx, key);
if (unlikely(IS_ERR(value)))
return PTR_ERR(value);
+
LASSERT(key->lct_owner != NULL);
if (!(ctx->lc_tags & LCT_NOREF))
- try_module_get(key->lct_owner);
+ cfs_try_module_get(key->lct_owner);
lu_ref_add_atomic(&key->lct_reference, "ctx", ctx);
- atomic_inc(&key->lct_used);
+ cfs_atomic_inc(&key->lct_used);
/*
* This is the only place in the code, where an
* element of ctx->lc_value[] array is set to non-NULL
static int keys_init(struct lu_context *ctx)
{
- int result;
-
- OBD_ALLOC(ctx->lc_value, ARRAY_SIZE(lu_keys) * sizeof ctx->lc_value[0]);
- if (likely(ctx->lc_value != NULL))
- result = keys_fill(ctx);
- else
- result = -ENOMEM;
+ OBD_ALLOC(ctx->lc_value, ARRAY_SIZE(lu_keys) * sizeof ctx->lc_value[0]);
+ if (likely(ctx->lc_value != NULL))
+ return keys_fill(ctx);
- if (result != 0)
- keys_fini(ctx);
- return result;
+ return -ENOMEM;
}
/**
*/
int lu_context_init(struct lu_context *ctx, __u32 tags)
{
- memset(ctx, 0, sizeof *ctx);
- ctx->lc_state = LCS_INITIALIZED;
- ctx->lc_tags = tags;
- if (tags & LCT_REMEMBER) {
- spin_lock(&lu_keys_guard);
- list_add(&ctx->lc_remember, &lu_context_remembered);
- spin_unlock(&lu_keys_guard);
- } else
- CFS_INIT_LIST_HEAD(&ctx->lc_remember);
- return keys_init(ctx);
+ int rc;
+
+ memset(ctx, 0, sizeof *ctx);
+ ctx->lc_state = LCS_INITIALIZED;
+ ctx->lc_tags = tags;
+ if (tags & LCT_REMEMBER) {
+ spin_lock(&lu_keys_guard);
+ cfs_list_add(&ctx->lc_remember, &lu_context_remembered);
+ spin_unlock(&lu_keys_guard);
+ } else {
+ CFS_INIT_LIST_HEAD(&ctx->lc_remember);
+ }
+
+ rc = keys_init(ctx);
+ if (rc != 0)
+ lu_context_fini(ctx);
+
+ return rc;
}
EXPORT_SYMBOL(lu_context_init);
*/
void lu_context_fini(struct lu_context *ctx)
{
- LINVRNT(ctx->lc_state == LCS_INITIALIZED || ctx->lc_state == LCS_LEFT);
- ctx->lc_state = LCS_FINALIZED;
- keys_fini(ctx);
- spin_lock(&lu_keys_guard);
- list_del_init(&ctx->lc_remember);
- spin_unlock(&lu_keys_guard);
+ LINVRNT(ctx->lc_state == LCS_INITIALIZED || ctx->lc_state == LCS_LEFT);
+ ctx->lc_state = LCS_FINALIZED;
+
+ if ((ctx->lc_tags & LCT_REMEMBER) == 0) {
+ LASSERT(cfs_list_empty(&ctx->lc_remember));
+ keys_fini(ctx);
+
+ } else { /* could race with key degister */
+ spin_lock(&lu_keys_guard);
+ keys_fini(ctx);
+ cfs_list_del_init(&ctx->lc_remember);
+ spin_unlock(&lu_keys_guard);
+ }
}
EXPORT_SYMBOL(lu_context_fini);
/**
* Allocate for context all missing keys that were registered after context
- * creation.
+ * creation. key_set_version is only changed in rare cases when modules
+ * are loaded and removed.
*/
int lu_context_refill(struct lu_context *ctx)
{
- LINVRNT(ctx->lc_value != NULL);
- return ctx->lc_version == key_set_version ? 0 : keys_fill(ctx);
+ return likely(ctx->lc_version == key_set_version) ? 0 : keys_fill(ctx);
}
EXPORT_SYMBOL(lu_context_refill);
-static int lu_env_setup(struct lu_env *env, struct lu_context *ses,
- __u32 tags, int noref)
+/**
+ * lu_ctx_tags/lu_ses_tags will be updated if there are new types of
+ * obd being added. Currently, this is only used on client side, specifically
+ * for echo device client, for other stack (like ptlrpc threads), context are
+ * predefined when the lu_device type are registered, during the module probe
+ * phase.
+ */
+__u32 lu_context_tags_default = 0;
+__u32 lu_session_tags_default = 0;
+
+void lu_context_tags_update(__u32 tags)
{
- int result;
+ spin_lock(&lu_keys_guard);
+ lu_context_tags_default |= tags;
+ key_set_version++;
+ spin_unlock(&lu_keys_guard);
+}
+EXPORT_SYMBOL(lu_context_tags_update);
- LINVRNT(ergo(!noref, !(tags & LCT_NOREF)));
+void lu_context_tags_clear(__u32 tags)
+{
+ spin_lock(&lu_keys_guard);
+ lu_context_tags_default &= ~tags;
+ key_set_version++;
+ spin_unlock(&lu_keys_guard);
+}
+EXPORT_SYMBOL(lu_context_tags_clear);
- env->le_ses = ses;
- result = lu_context_init(&env->le_ctx, tags);
- if (likely(result == 0))
- lu_context_enter(&env->le_ctx);
- return result;
+void lu_session_tags_update(__u32 tags)
+{
+ spin_lock(&lu_keys_guard);
+ lu_session_tags_default |= tags;
+ key_set_version++;
+ spin_unlock(&lu_keys_guard);
}
+EXPORT_SYMBOL(lu_session_tags_update);
-static int lu_env_init_noref(struct lu_env *env, struct lu_context *ses,
- __u32 tags)
+void lu_session_tags_clear(__u32 tags)
{
- return lu_env_setup(env, ses, tags, 1);
+ spin_lock(&lu_keys_guard);
+ lu_session_tags_default &= ~tags;
+ key_set_version++;
+ spin_unlock(&lu_keys_guard);
}
+EXPORT_SYMBOL(lu_session_tags_clear);
-int lu_env_init(struct lu_env *env, struct lu_context *ses, __u32 tags)
+int lu_env_init(struct lu_env *env, __u32 tags)
{
- return lu_env_setup(env, ses, tags, 0);
+ int result;
+
+ env->le_ses = NULL;
+ result = lu_context_init(&env->le_ctx, tags);
+ if (likely(result == 0))
+ lu_context_enter(&env->le_ctx);
+ return result;
}
EXPORT_SYMBOL(lu_env_init);
}
EXPORT_SYMBOL(lu_env_refill);
-static struct shrinker *lu_site_shrinker = NULL;
+/**
+ * Currently, this API will only be used by echo client.
+ * Because echo client and normal lustre client will share
+ * same cl_env cache. So echo client needs to refresh
+ * the env context after it get one from the cache, especially
+ * when normal client and echo client co-exist in the same client.
+ */
+int lu_env_refill_by_tags(struct lu_env *env, __u32 ctags,
+ __u32 stags)
+{
+ int result;
+
+ if ((env->le_ctx.lc_tags & ctags) != ctags) {
+ env->le_ctx.lc_version = 0;
+ env->le_ctx.lc_tags |= ctags;
+ }
+
+ if (env->le_ses && (env->le_ses->lc_tags & stags) != stags) {
+ env->le_ses->lc_version = 0;
+ env->le_ses->lc_tags |= stags;
+ }
+
+ result = lu_env_refill(env);
+
+ return result;
+}
+EXPORT_SYMBOL(lu_env_refill_by_tags);
+
+static struct cfs_shrinker *lu_site_shrinker = NULL;
+
+typedef struct lu_site_stats{
+ unsigned lss_populated;
+ unsigned lss_max_search;
+ unsigned lss_total;
+ unsigned lss_busy;
+} lu_site_stats_t;
+
+static void lu_site_stats_get(cfs_hash_t *hs,
+ lu_site_stats_t *stats, int populated)
+{
+ cfs_hash_bd_t bd;
+ int i;
+
+ cfs_hash_for_each_bucket(hs, &bd, i) {
+ struct lu_site_bkt_data *bkt = cfs_hash_bd_extra_get(hs, &bd);
+ cfs_hlist_head_t *hhead;
+
+ cfs_hash_bd_lock(hs, &bd, 1);
+ stats->lss_busy += bkt->lsb_busy;
+ stats->lss_total += cfs_hash_bd_count_get(&bd);
+ stats->lss_max_search = max((int)stats->lss_max_search,
+ cfs_hash_bd_depmax_get(&bd));
+ if (!populated) {
+ cfs_hash_bd_unlock(hs, &bd, 1);
+ continue;
+ }
+
+ cfs_hash_bd_for_each_hlist(hs, &bd, hhead) {
+ if (!cfs_hlist_empty(hhead))
+ stats->lss_populated++;
+ }
+ cfs_hash_bd_unlock(hs, &bd, 1);
+ }
+}
#ifdef __KERNEL__
-static int lu_cache_shrink(int nr, unsigned int gfp_mask)
+
+/*
+ * There exists a potential lock inversion deadlock scenario when using
+ * Lustre on top of ZFS. This occurs between one of ZFS's
+ * buf_hash_table.ht_lock's, and Lustre's lu_sites_guard lock. Essentially,
+ * thread A will take the lu_sites_guard lock and sleep on the ht_lock,
+ * while thread B will take the ht_lock and sleep on the lu_sites_guard
+ * lock. Obviously neither thread will wake and drop their respective hold
+ * on their lock.
+ *
+ * To prevent this from happening we must ensure the lu_sites_guard lock is
+ * not taken while down this code path. ZFS reliably does not set the
+ * __GFP_FS bit in its code paths, so this can be used to determine if it
+ * is safe to take the lu_sites_guard lock.
+ *
+ * Ideally we should accurately return the remaining number of cached
+ * objects without taking the lu_sites_guard lock, but this is not
+ * possible in the current implementation.
+ */
+static int lu_cache_shrink(SHRINKER_ARGS(sc, nr_to_scan, gfp_mask))
{
+ lu_site_stats_t stats;
struct lu_site *s;
struct lu_site *tmp;
int cached = 0;
- int remain = nr;
+ int remain = shrink_param(sc, nr_to_scan);
CFS_LIST_HEAD(splice);
- if (nr != 0 && !(gfp_mask & __GFP_FS))
- return -1;
+ if (!(shrink_param(sc, gfp_mask) & __GFP_FS)) {
+ if (remain != 0)
+ return -1;
+ else
+ /* We must not take the lu_sites_guard lock when
+ * __GFP_FS is *not* set because of the deadlock
+ * possibility detailed above. Additionally,
+ * since we cannot determine the number of
+ * objects in the cache without taking this
+ * lock, we're in a particularly tough spot. As
+ * a result, we'll just lie and say our cache is
+ * empty. This _should_ be ok, as we can't
+ * reclaim objects when __GFP_FS is *not* set
+ * anyways.
+ */
+ return 0;
+ }
+
+ CDEBUG(D_INODE, "Shrink %d objects\n", remain);
- down(&lu_sites_guard);
- list_for_each_entry_safe(s, tmp, &lu_sites, ls_linkage) {
- if (nr != 0) {
+ mutex_lock(&lu_sites_guard);
+ cfs_list_for_each_entry_safe(s, tmp, &lu_sites, ls_linkage) {
+ if (shrink_param(sc, nr_to_scan) != 0) {
remain = lu_site_purge(&lu_shrink_env, s, remain);
/*
* Move just shrunk site to the tail of site list to
* assure shrinking fairness.
*/
- list_move_tail(&s->ls_linkage, &splice);
+ cfs_list_move_tail(&s->ls_linkage, &splice);
}
- read_lock(&s->ls_guard);
- cached += s->ls_total - s->ls_busy;
- read_unlock(&s->ls_guard);
- if (remain <= 0)
+
+ memset(&stats, 0, sizeof(stats));
+ lu_site_stats_get(s->ls_obj_hash, &stats, 0);
+ cached += stats.lss_total - stats.lss_busy;
+ if (shrink_param(sc, nr_to_scan) && remain <= 0)
break;
}
- list_splice(&splice, lu_sites.prev);
- up(&lu_sites_guard);
+ cfs_list_splice(&splice, lu_sites.prev);
+ mutex_unlock(&lu_sites_guard);
+
+ cached = (cached / 100) * sysctl_vfs_cache_pressure;
+ if (shrink_param(sc, nr_to_scan) == 0)
+ CDEBUG(D_INODE, "%d objects cached\n", cached);
return cached;
}
+/*
+ * Debugging stuff.
+ */
+
+/**
+ * Environment to be used in debugger, contains all tags.
+ */
+struct lu_env lu_debugging_env;
+
+/**
+ * Debugging printer function using printk().
+ */
+int lu_printk_printer(const struct lu_env *env,
+ void *unused, const char *format, ...)
+{
+ va_list args;
+
+ va_start(args, format);
+ vprintk(format, args);
+ va_end(args);
+ return 0;
+}
+
+int lu_debugging_setup(void)
+{
+ return lu_env_init(&lu_debugging_env, ~0);
+}
+
+void lu_context_keys_dump(void)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(lu_keys); ++i) {
+ struct lu_context_key *key;
+
+ key = lu_keys[i];
+ if (key != NULL) {
+ CERROR("[%d]: %p %x (%p,%p,%p) %d %d \"%s\"@%p\n",
+ i, key, key->lct_tags,
+ key->lct_init, key->lct_fini, key->lct_exit,
+ key->lct_index, cfs_atomic_read(&key->lct_used),
+ key->lct_owner ? key->lct_owner->name : "",
+ key->lct_owner);
+ lu_ref_print(&key->lct_reference);
+ }
+ }
+}
+EXPORT_SYMBOL(lu_context_keys_dump);
#else /* !__KERNEL__ */
static int lu_cache_shrink(int nr, unsigned int gfp_mask)
{
}
#endif /* __KERNEL__ */
-int lu_ref_global_init(void);
-void lu_ref_global_fini(void);
-
/**
* Initialization of global lu_* data.
*/
{
int result;
- CDEBUG(D_CONSOLE, "Lustre LU module (%p).\n", &lu_keys);
+ CDEBUG(D_INFO, "Lustre LU module (%p).\n", &lu_keys);
+
+ result = lu_ref_global_init();
+ if (result != 0)
+ return result;
LU_CONTEXT_KEY_INIT(&lu_global_key);
result = lu_context_key_register(&lu_global_key);
if (result != 0)
return result;
- /*
+
+ /*
* At this level, we don't know what tags are needed, so allocate them
* conservatively. This should not be too bad, because this
* environment is global.
- */
- down(&lu_sites_guard);
- result = lu_env_init_noref(&lu_shrink_env, NULL, LCT_SHRINKER);
- up(&lu_sites_guard);
+ */
+ mutex_lock(&lu_sites_guard);
+ result = lu_env_init(&lu_shrink_env, LCT_SHRINKER);
+ mutex_unlock(&lu_sites_guard);
if (result != 0)
return result;
- result = lu_ref_global_init();
- if (result != 0)
- return result;
- /*
+ /*
* seeks estimation: 3 seeks to read a record from oi, one to read
* inode, one for ea. Unfortunately setting this high value results in
* lu_object/inode cache consuming all the memory.
*/
- lu_site_shrinker = set_shrinker(DEFAULT_SEEKS, lu_cache_shrink);
+ lu_site_shrinker = cfs_set_shrinker(CFS_DEFAULT_SEEKS, lu_cache_shrink);
if (lu_site_shrinker == NULL)
return -ENOMEM;
- result = lu_time_global_init();
return result;
}
*/
void lu_global_fini(void)
{
- lu_time_global_fini();
if (lu_site_shrinker != NULL) {
- remove_shrinker(lu_site_shrinker);
+ cfs_remove_shrinker(lu_site_shrinker);
lu_site_shrinker = NULL;
}
- lu_context_key_degister(&lu_global_key);
+ lu_context_key_degister(&lu_global_key);
/*
* Tear shrinker environment down _after_ de-registering
* lu_global_key, because the latter has a value in the former.
*/
- down(&lu_sites_guard);
+ mutex_lock(&lu_sites_guard);
lu_env_fini(&lu_shrink_env);
- up(&lu_sites_guard);
+ mutex_unlock(&lu_sites_guard);
lu_ref_global_fini();
}
-struct lu_buf LU_BUF_NULL = {
- .lb_buf = NULL,
- .lb_len = 0
-};
-EXPORT_SYMBOL(LU_BUF_NULL);
+static __u32 ls_stats_read(struct lprocfs_stats *stats, int idx)
+{
+#ifdef LPROCFS
+ struct lprocfs_counter ret;
-/*
- * XXX: Functions below logically belong to fid module, but they are used by
- * dt_store_open(). Put them here until better place is found.
+ lprocfs_stats_collect(stats, idx, &ret);
+ return (__u32)ret.lc_count;
+#else
+ return 0;
+#endif
+}
+
+/**
+ * Output site statistical counters into a buffer. Suitable for
+ * lprocfs_rd_*()-style functions.
+ */
+int lu_site_stats_print(const struct lu_site *s, char *page, int count)
+{
+ lu_site_stats_t stats;
+
+ memset(&stats, 0, sizeof(stats));
+ lu_site_stats_get(s->ls_obj_hash, &stats, 1);
+
+ return snprintf(page, count, "%d/%d %d/%d %d %d %d %d %d %d %d\n",
+ stats.lss_busy,
+ stats.lss_total,
+ stats.lss_populated,
+ CFS_HASH_NHLIST(s->ls_obj_hash),
+ stats.lss_max_search,
+ ls_stats_read(s->ls_stats, LU_SS_CREATED),
+ ls_stats_read(s->ls_stats, LU_SS_CACHE_HIT),
+ ls_stats_read(s->ls_stats, LU_SS_CACHE_MISS),
+ ls_stats_read(s->ls_stats, LU_SS_CACHE_RACE),
+ ls_stats_read(s->ls_stats, LU_SS_CACHE_DEATH_RACE),
+ ls_stats_read(s->ls_stats, LU_SS_LRU_PURGED));
+}
+EXPORT_SYMBOL(lu_site_stats_print);
+
+/**
+ * Helper function to initialize a number of kmem slab caches at once.
*/
+int lu_kmem_init(struct lu_kmem_descr *caches)
+{
+ int result;
+ struct lu_kmem_descr *iter = caches;
+
+ for (result = 0; iter->ckd_cache != NULL; ++iter) {
+ *iter->ckd_cache = cfs_mem_cache_create(iter->ckd_name,
+ iter->ckd_size,
+ 0, 0);
+ if (*iter->ckd_cache == NULL) {
+ result = -ENOMEM;
+ /* free all previously allocated caches */
+ lu_kmem_fini(caches);
+ break;
+ }
+ }
+ return result;
+}
+EXPORT_SYMBOL(lu_kmem_init);
-void fid_pack(struct lu_fid_pack *pack, const struct lu_fid *fid,
- struct lu_fid *befider)
+/**
+ * Helper function to finalize a number of kmem slab cached at once. Dual to
+ * lu_kmem_init().
+ */
+void lu_kmem_fini(struct lu_kmem_descr *caches)
{
- int recsize;
- __u64 seq;
- __u32 oid;
+ int rc;
+
+ for (; caches->ckd_cache != NULL; ++caches) {
+ if (*caches->ckd_cache != NULL) {
+ rc = cfs_mem_cache_destroy(*caches->ckd_cache);
+ LASSERTF(rc == 0, "couldn't destroy %s slab\n",
+ caches->ckd_name);
+ *caches->ckd_cache = NULL;
+ }
+ }
+}
+EXPORT_SYMBOL(lu_kmem_fini);
- seq = fid_seq(fid);
- oid = fid_oid(fid);
+/**
+ * Temporary solution to be able to assign fid in ->do_create()
+ * till we have fully-functional OST fids
+ */
+void lu_object_assign_fid(const struct lu_env *env, struct lu_object *o,
+ const struct lu_fid *fid)
+{
+ struct lu_site *s = o->lo_dev->ld_site;
+ struct lu_fid *old = &o->lo_header->loh_fid;
+ struct lu_site_bkt_data *bkt;
+ struct lu_object *shadow;
+ cfs_waitlink_t waiter;
+ cfs_hash_t *hs;
+ cfs_hash_bd_t bd;
+ __u64 version = 0;
+
+ LASSERT(fid_is_zero(old));
+
+ hs = s->ls_obj_hash;
+ cfs_hash_bd_get_and_lock(hs, (void *)fid, &bd, 1);
+ shadow = htable_lookup(s, &bd, fid, &waiter, &version);
+ /* supposed to be unique */
+ LASSERT(shadow == NULL);
+ *old = *fid;
+ bkt = cfs_hash_bd_extra_get(hs, &bd);
+ cfs_hash_bd_add_locked(hs, &bd, &o->lo_header->loh_hash);
+ bkt->lsb_busy++;
+ cfs_hash_bd_unlock(hs, &bd, 1);
+}
+EXPORT_SYMBOL(lu_object_assign_fid);
- /*
- * Two cases: compact 6 bytes representation for a common case, and
- * full 17 byte representation for "unusual" fid.
- */
+/**
+ * allocates object with 0 (non-assiged) fid
+ * XXX: temporary solution to be able to assign fid in ->do_create()
+ * till we have fully-functional OST fids
+ */
+struct lu_object *lu_object_anon(const struct lu_env *env,
+ struct lu_device *dev,
+ const struct lu_object_conf *conf)
+{
+ struct lu_fid fid;
+ struct lu_object *o;
- /*
- * Check that usual case is really usual.
- */
- CLASSERT(LUSTRE_SEQ_MAX_WIDTH < 0xffffull);
+ fid_zero(&fid);
+ o = lu_object_alloc(env, dev, &fid, conf);
- if (fid_is_igif(fid) ||
- seq > 0xffffffull || oid > 0xffff || fid_ver(fid) != 0) {
- fid_cpu_to_be(befider, fid);
- recsize = sizeof *befider;
- } else {
- unsigned char *small_befider;
+ return o;
+}
+EXPORT_SYMBOL(lu_object_anon);
- small_befider = (char *)befider;
+struct lu_buf LU_BUF_NULL = {
+ .lb_buf = NULL,
+ .lb_len = 0
+};
+EXPORT_SYMBOL(LU_BUF_NULL);
- small_befider[0] = seq >> 16;
- small_befider[1] = seq >> 8;
- small_befider[2] = seq;
+void lu_buf_free(struct lu_buf *buf)
+{
+ LASSERT(buf);
+ if (buf->lb_buf) {
+ LASSERT(buf->lb_len > 0);
+ OBD_FREE_LARGE(buf->lb_buf, buf->lb_len);
+ buf->lb_buf = NULL;
+ buf->lb_len = 0;
+ }
+}
+EXPORT_SYMBOL(lu_buf_free);
- small_befider[3] = oid >> 8;
- small_befider[4] = oid;
+void lu_buf_alloc(struct lu_buf *buf, int size)
+{
+ LASSERT(buf);
+ LASSERT(buf->lb_buf == NULL);
+ LASSERT(buf->lb_len == 0);
+ OBD_ALLOC_LARGE(buf->lb_buf, size);
+ if (likely(buf->lb_buf))
+ buf->lb_len = size;
+}
+EXPORT_SYMBOL(lu_buf_alloc);
- recsize = 5;
- }
- memcpy(pack->fp_area, befider, recsize);
- pack->fp_len = recsize + 1;
+void lu_buf_realloc(struct lu_buf *buf, int size)
+{
+ lu_buf_free(buf);
+ lu_buf_alloc(buf, size);
}
-EXPORT_SYMBOL(fid_pack);
+EXPORT_SYMBOL(lu_buf_realloc);
-int fid_unpack(const struct lu_fid_pack *pack, struct lu_fid *fid)
+struct lu_buf *lu_buf_check_and_alloc(struct lu_buf *buf, int len)
{
- int result;
+ if (buf->lb_buf == NULL && buf->lb_len == 0)
+ lu_buf_alloc(buf, len);
- result = 0;
- switch (pack->fp_len) {
- case sizeof *fid + 1:
- memcpy(fid, pack->fp_area, sizeof *fid);
- fid_be_to_cpu(fid, fid);
- break;
- case 6: {
- const unsigned char *area;
-
- area = pack->fp_area;
- fid->f_seq = (area[0] << 16) | (area[1] << 8) | area[2];
- fid->f_oid = (area[3] << 8) | area[4];
- fid->f_ver = 0;
- break;
- }
- default:
- CERROR("Unexpected packed fid size: %d\n", pack->fp_len);
- result = -EIO;
- }
- return result;
+ if ((len > buf->lb_len) && (buf->lb_buf != NULL))
+ lu_buf_realloc(buf, len);
+
+ return buf;
}
-EXPORT_SYMBOL(fid_unpack);
+EXPORT_SYMBOL(lu_buf_check_and_alloc);
+
+/**
+ * Increase the size of the \a buf.
+ * preserves old data in buffer
+ * old buffer remains unchanged on error
+ * \retval 0 or -ENOMEM
+ */
+int lu_buf_check_and_grow(struct lu_buf *buf, int len)
+{
+ char *ptr;
+
+ if (len <= buf->lb_len)
+ return 0;
+
+ OBD_ALLOC_LARGE(ptr, len);
+ if (ptr == NULL)
+ return -ENOMEM;
+
+ /* Free the old buf */
+ if (buf->lb_buf != NULL) {
+ memcpy(ptr, buf->lb_buf, buf->lb_len);
+ OBD_FREE_LARGE(buf->lb_buf, buf->lb_len);
+ }
+
+ buf->lb_buf = ptr;
+ buf->lb_len = len;
+ return 0;
+}
+EXPORT_SYMBOL(lu_buf_check_and_grow);
-const char *lu_time_names[LU_TIME_NR] = {
- [LU_TIME_FIND_LOOKUP] = "find_lookup",
- [LU_TIME_FIND_ALLOC] = "find_alloc",
- [LU_TIME_FIND_INSERT] = "find_insert"
-};
-EXPORT_SYMBOL(lu_time_names);
git://git.whamcloud.com / fs / lustre-release.git / blobdiff