* These are the only exported functions, they provide some generic
* infrastructure for managing object devices
*
- * Author: Nikita Danilov <nikita@clusterfs.com>
+ * Author: Nikita Danilov <nikita.danilov@sun.com>
*/
#define DEBUG_SUBSYSTEM S_CLASS
# define EXPORT_SYMTAB
#endif
-#include <linux/seq_file.h>
-#include <linux/module.h>
-/* nr_free_pages() */
-#include <linux/swap.h>
+#include <libcfs/libcfs.h>
+
+#ifdef __KERNEL__
+# include <linux/module.h>
+#endif
+
/* hash_long() */
#include <libcfs/libcfs_hash.h>
+#include <obd_class.h>
#include <obd_support.h>
#include <lustre_disk.h>
#include <lustre_fid.h>
static void lu_object_free(const struct lu_env *env, struct lu_object *o);
-/*
+/**
* Decrease reference counter on object. If last reference is freed, return
* object to the cache, unless lu_object_is_dying(o) holds. In the latter
* case, free object immediately.
}
EXPORT_SYMBOL(lu_object_put);
-/*
+/**
* Allocate new object.
*
* This follows object creation protocol, described in the comment within
* struct lu_device_operations definition.
*/
static struct lu_object *lu_object_alloc(const struct lu_env *env,
- struct lu_site *s,
- const struct lu_fid *f)
+ struct lu_device *dev,
+ const struct lu_fid *f,
+ const struct lu_object_conf *conf)
{
struct lu_object *scan;
struct lu_object *top;
* Create top-level object slice. This will also create
* lu_object_header.
*/
- top = s->ls_top_dev->ld_ops->ldo_object_alloc(env,
- NULL, s->ls_top_dev);
+ top = dev->ld_ops->ldo_object_alloc(env, NULL, dev);
if (top == NULL)
RETURN(ERR_PTR(-ENOMEM));
/*
continue;
clean = 0;
scan->lo_header = top->lo_header;
- result = scan->lo_ops->loo_object_init(env, scan);
+ result = scan->lo_ops->loo_object_init(env, scan, conf);
if (result != 0) {
lu_object_free(env, top);
RETURN(ERR_PTR(result));
}
}
- s->ls_stats.s_created ++;
+ dev->ld_site->ls_stats.s_created ++;
RETURN(top);
}
-/*
- * Free object.
+/**
+ * Free an object.
*/
static void lu_object_free(const struct lu_env *env, struct lu_object *o)
{
- struct list_head splice;
+ struct list_head splice;
struct lu_object *scan;
+ struct lu_site *site;
+ struct list_head *layers;
+ site = o->lo_dev->ld_site;
+ layers = &o->lo_header->loh_layers;
/*
* First call ->loo_object_delete() method to release all resources.
*/
- list_for_each_entry_reverse(scan,
- &o->lo_header->loh_layers, lo_linkage) {
+ 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(&o->lo_header->loh_layers, &splice);
+ list_splice_init(layers, &splice);
while (!list_empty(&splice)) {
- o = container_of0(splice.next, struct lu_object, lo_linkage);
+ /*
+ * 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);
LASSERT(o->lo_ops->loo_object_free != NULL);
o->lo_ops->loo_object_free(env, o);
}
+ cfs_waitq_broadcast(&site->ls_marche_funebre);
}
-/*
- * Free @nr objects from the cold end of the site LRU list.
+/**
+ * Free \a nr objects from the cold end of the site LRU list.
*/
int lu_site_purge(const struct lu_env *env, struct lu_site *s, int nr)
{
*/
enum {
- /*
+ /**
* Maximal line size.
*
* XXX overflow is not handled correctly.
};
struct lu_cdebug_data {
- /*
+ /**
* Temporary buffer.
*/
char lck_area[LU_CDEBUG_LINE];
- /*
- * fid staging area used by dt_store_open().
- */
- struct lu_fid_pack lck_pack;
};
/* context key constructor/destructor: lu_global_key_init, lu_global_key_fini */
LU_KEY_INIT_FINI(lu_global, struct lu_cdebug_data);
-/*
+/**
* Key, holding temporary buffer. This key is registered very early by
* lu_global_init().
*/
.lct_fini = lu_global_key_fini
};
-/*
+/**
* Printer function emitting messages through libcfs_debug_msg().
*/
int lu_cdebug_printer(const struct lu_env *env,
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 (cdebug_show(info->lpi_mask, info->lpi_subsys))
+ libcfs_debug_msg(NULL, info->lpi_subsys, info->lpi_mask,
+ (char *)info->lpi_file, info->lpi_fn,
+ info->lpi_line, "%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),
PFID(&hdr->loh_fid),
hlist_unhashed(&hdr->loh_hash) ? "" : " hash",
- list_empty(&hdr->loh_lru) ? "" : " lru",
+ list_empty((struct list_head *)&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");
+ (*printer)(env, cookie, "{ \n");
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)
static struct lu_object *htable_lookup(struct lu_site *s,
const struct hlist_head *bucket,
- const struct lu_fid *f)
+ const struct lu_fid *f,
+ cfs_waitlink_t *waiter)
{
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))) {
+ if (likely(lu_fid_eq(&h->loh_fid, f))) {
+ if (unlikely(lu_object_is_dying(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(&s->ls_marche_funebre, waiter);
+ set_current_state(CFS_TASK_UNINT);
+ s->ls_stats.s_cache_death_race ++;
+ return ERR_PTR(-EAGAIN);
+ }
/* bump reference count... */
if (atomic_add_return(1, &h->loh_ref) == 1)
++ s->ls_busy;
return hash_long(fid_flatten(f), bits);
}
-/*
- * 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.
+/**
+ * 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_site *s, const struct lu_fid *f)
+ struct lu_device *dev, const struct lu_fid *f,
+ const struct lu_object_conf *conf)
{
- struct lu_object *o;
- struct lu_object *shadow;
+ return lu_object_find_at(env, dev->ld_site->ls_top_dev, f, conf);
+}
+EXPORT_SYMBOL(lu_object_find);
+
+/**
+ * Core logic of lu_object_find*() functions.
+ */
+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_site *s;
+ struct lu_object *o;
+ struct lu_object *shadow;
struct hlist_head *bucket;
/*
* object just allocated.
* - unlock index;
* - return object.
+ *
+ * If dying object is found during index search, add @waiter to the
+ * site wait-queue and return ERR_PTR(-EAGAIN).
*/
+ s = dev->ld_site;
bucket = s->ls_hash + fid_hash(f, s->ls_hash_bits);
read_lock(&s->ls_guard);
- o = htable_lookup(s, bucket, f);
+ o = htable_lookup(s, bucket, f, waiter);
read_unlock(&s->ls_guard);
if (o != NULL)
* 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);
+ shadow = htable_lookup(s, bucket, f, waiter);
if (likely(shadow == NULL)) {
hlist_add_head(&o->lo_header->loh_hash, bucket);
list_add_tail(&o->lo_header->loh_lru, &s->ls_lru);
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_object *obj;
+ cfs_waitlink_t wait;
+
+ while (1) {
+ obj = lu_object_find_try(env, dev, f, conf, &wait);
+ if (obj == ERR_PTR(-EAGAIN)) {
+ /*
+ * lu_object_find_try() already added waiter into the
+ * wait queue.
+ */
+ cfs_waitq_wait(&wait, CFS_TASK_UNINT);
+ cfs_waitq_del(&dev->ld_site->ls_marche_funebre, &wait);
+ } else
+ break;
+ }
+ return obj;
+}
+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.
+ */
+static CFS_LIST_HEAD(lu_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;
+}
+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);
+}
+EXPORT_SYMBOL(lu_device_type_fini);
+
+void lu_types_stop(void)
+{
+ 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);
+ }
+}
+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);
-/*
+/**
* Global environment used by site shrinker.
*/
static struct lu_env lu_shrink_env;
-/*
- * Print all objects in @s.
+/**
+ * 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)
LU_CACHE_PERCENT = 20,
};
-/*
+/**
* Return desired hash table order.
*/
static int lu_htable_order(void)
return bits;
}
-/*
- * Initialize site @s, with @d as the top level device.
+static struct lock_class_key lu_site_guard_class;
+
+/**
+ * Initialize site \a s, with \a d as the top level device.
*/
int lu_site_init(struct lu_site *s, struct lu_device *top)
{
memset(s, 0, sizeof *s);
rwlock_init(&s->ls_guard);
+ lockdep_set_class(&s->ls_guard, &lu_site_guard_class);
CFS_INIT_LIST_HEAD(&s->ls_lru);
CFS_INIT_LIST_HEAD(&s->ls_linkage);
+ cfs_waitq_init(&s->ls_marche_funebre);
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 =
}
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)
{
}
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;
}
}
EXPORT_SYMBOL(lu_site_fini);
-/*
+/**
* Called when initialization of stack for this site is completed.
*/
int lu_site_init_finish(struct lu_site *s)
}
EXPORT_SYMBOL(lu_site_init_finish);
-/*
- * Acquire additional reference on device @d
+/**
+ * Acquire additional reference on device \a d
*/
void lu_device_get(struct lu_device *d)
{
}
EXPORT_SYMBOL(lu_device_get);
-/*
- * Release reference on device @d.
+/**
+ * Release reference on device \a d.
*/
void lu_device_put(struct lu_device *d)
{
+ LASSERT(atomic_read(&d->ld_ref) > 0);
atomic_dec(&d->ld_ref);
}
EXPORT_SYMBOL(lu_device_put);
-/*
- * Initialize device @d of type @t.
+/**
+ * Initialize device \a d of type \a t.
*/
int lu_device_init(struct lu_device *d, struct lu_device_type *t)
{
+ 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);
d->ld_type = t;
+ lu_ref_init(&d->ld_reference);
return 0;
}
EXPORT_SYMBOL(lu_device_init);
-/*
- * Finalize device @d.
+/**
+ * Finalize device \a d.
*/
void lu_device_fini(struct lu_device *d)
{
- if (d->ld_obd != NULL)
- /* finish lprocfs */
- lprocfs_obd_cleanup(d->ld_obd);
+ struct lu_device_type *t;
+
+ t = d->ld_type;
+ 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));
+ LASSERT(t->ldt_device_nr > 0);
+ if (--t->ldt_device_nr == 0 && t->ldt_ops->ldto_stop != NULL)
+ t->ldt_ops->ldto_stop(t);
}
EXPORT_SYMBOL(lu_device_fini);
-/*
- * Initialize object @o that is part of compound object @h and was created by
- * device @d.
+/**
+ * Initialize object \a o that is part of compound object \a h and was created
+ * by device \a d.
*/
int lu_object_init(struct lu_object *o,
struct lu_object_header *h, struct lu_device *d)
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)
{
+ struct lu_device *dev = o->lo_dev;
+
LASSERT(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.
}
EXPORT_SYMBOL(lu_object_add_top);
-/*
- * Add object @o as a layer of compound object, going after @before.1
+/**
+ * Add object \a o as a layer of compound object, going after \a before.
*
- * This is typically called by the ->ldo_object_alloc() method of
- * @before->lo_dev.
+ * This is typically called by the ->ldo_object_alloc() method of \a
+ * before->lo_dev.
*/
void lu_object_add(struct lu_object *before, struct lu_object *o)
{
}
EXPORT_SYMBOL(lu_object_add);
-/*
+/**
* Initialize compound object.
*/
int lu_object_header_init(struct lu_object_header *h)
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));
+ 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;
-/*
+/**
* 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);
}
next = ldt->ldt_ops->ldto_device_free(env, scan);
type = ldt->ldt_obd_type;
- type->typ_refcnt--;
- class_put_type(type);
+ if (type != NULL) {
+ type->typ_refcnt--;
+ class_put_type(type);
+ }
}
}
EXPORT_SYMBOL(lu_stack_fini);
enum {
- /*
+ /**
* Maximal number of tld slots.
*/
- LU_CONTEXT_KEY_NR = 16
+ LU_CONTEXT_KEY_NR = 32
};
static struct lu_context_key *lu_keys[LU_CONTEXT_KEY_NR] = { NULL, };
static spinlock_t lu_keys_guard = SPIN_LOCK_UNLOCKED;
-/*
+/**
+ * Global counter incremented whenever key is registered, unregistered,
+ * revived or quiesced. This is used to void unnecessary calls to
+ * lu_context_refill(). No locking is provided, as initialization and shutdown
+ * are supposed to be externally serialized.
+ */
+static unsigned key_set_version = 0;
+
+/**
* Register new key.
*/
int lu_context_key_register(struct lu_context_key *key)
key->lct_index = i;
atomic_set(&key->lct_used, 1);
lu_keys[i] = key;
+ lu_ref_init(&key->lct_reference);
result = 0;
+ ++key_set_version;
break;
}
}
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(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)) {
}
}
-/*
+/**
* Deregister key.
*/
void lu_context_key_degister(struct lu_context_key *key)
{
LASSERT(atomic_read(&key->lct_used) >= 1);
- LASSERT(0 <= key->lct_index && key->lct_index < ARRAY_SIZE(lu_keys));
+ LINVRNT(0 <= key->lct_index && key->lct_index < ARRAY_SIZE(lu_keys));
- key_fini(&lu_shrink_env.le_ctx, key->lct_index);
+ lu_context_key_quiesce(key);
- if (atomic_read(&key->lct_used) > 1)
- CERROR("key has instances.\n");
+ ++key_set_version;
spin_lock(&lu_keys_guard);
- lu_keys[key->lct_index] = NULL;
+ 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(atomic_read(&key->lct_used) == 1, "key has instances: %d\n",
+ atomic_read(&key->lct_used));
}
EXPORT_SYMBOL(lu_context_key_degister);
-/*
- * Return value associated with key @key in context @ctx.
+/**
+ * Register a number of keys. This has to be called after all keys have been
+ * initialized by a call to LU_CONTEXT_KEY_INIT().
+ */
+int lu_context_key_register_many(struct lu_context_key *k, ...)
+{
+ struct lu_context_key *key = k;
+ va_list args;
+ int result;
+
+ va_start(args, k);
+ do {
+ result = lu_context_key_register(key);
+ if (result)
+ break;
+ key = va_arg(args, struct lu_context_key *);
+ } while (key != NULL);
+ va_end(args);
+
+ if (result != 0) {
+ va_start(args, k);
+ while (k != key) {
+ lu_context_key_degister(k);
+ k = va_arg(args, struct lu_context_key *);
+ }
+ va_end(args);
+ }
+
+ return result;
+}
+EXPORT_SYMBOL(lu_context_key_register_many);
+
+/**
+ * De-register a number of keys. This is a dual to
+ * lu_context_key_register_many().
+ */
+void lu_context_key_degister_many(struct lu_context_key *k, ...)
+{
+ va_list args;
+
+ va_start(args, k);
+ do {
+ lu_context_key_degister(k);
+ k = va_arg(args, struct lu_context_key*);
+ } while (k != NULL);
+ va_end(args);
+}
+EXPORT_SYMBOL(lu_context_key_degister_many);
+
+/**
+ * Revive a number of keys.
+ */
+void lu_context_key_revive_many(struct lu_context_key *k, ...)
+{
+ va_list args;
+
+ va_start(args, k);
+ do {
+ lu_context_key_revive(k);
+ k = va_arg(args, struct lu_context_key*);
+ } while (k != NULL);
+ va_end(args);
+}
+EXPORT_SYMBOL(lu_context_key_revive_many);
+
+/**
+ * Quiescent a number of keys.
+ */
+void lu_context_key_quiesce_many(struct lu_context_key *k, ...)
+{
+ va_list args;
+
+ va_start(args, k);
+ do {
+ lu_context_key_quiesce(k);
+ k = va_arg(args, struct lu_context_key*);
+ } while (k != NULL);
+ va_end(args);
+}
+EXPORT_SYMBOL(lu_context_key_quiesce_many);
+
+/**
+ * Return value associated with key \a key in context \a ctx.
*/
void *lu_context_key_get(const struct lu_context *ctx,
- struct lu_context_key *key)
+ const struct lu_context_key *key)
{
- LASSERT(ctx->lc_state == LCS_ENTERED);
- LASSERT(0 <= key->lct_index && key->lct_index < ARRAY_SIZE(lu_keys));
+ 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);
+/**
+ * List of remembered contexts. XXX document me.
+ */
+static CFS_LIST_HEAD(lu_context_remembered);
+
+/**
+ * Destroy \a key in all remembered contexts. This is used to destroy key
+ * values in "shared" contexts (like service threads), when a module owning
+ * the key is about to be unloaded.
+ */
+void lu_context_key_quiesce(struct lu_context_key *key)
+{
+ struct lu_context *ctx;
+ extern unsigned cl_env_cache_purge(unsigned nr);
+
+ if (!(key->lct_tags & LCT_QUIESCENT)) {
+ /*
+ * XXX layering violation.
+ */
+ cl_env_cache_purge(~0);
+ 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;
+ }
+}
+EXPORT_SYMBOL(lu_context_key_quiesce);
+
+void lu_context_key_revive(struct lu_context_key *key)
+{
+ key->lct_tags &= ~LCT_QUIESCENT;
+ ++key_set_version;
+}
+EXPORT_SYMBOL(lu_context_key_revive);
+
static void keys_fini(struct lu_context *ctx)
{
int i;
+ spin_lock(&lu_keys_guard);
if (ctx->lc_value != NULL) {
for (i = 0; i < ARRAY_SIZE(lu_keys); ++i)
key_fini(ctx, i);
ARRAY_SIZE(lu_keys) * sizeof ctx->lc_value[0]);
ctx->lc_value = NULL;
}
+ spin_unlock(&lu_keys_guard);
}
-static int keys_fill(const struct lu_context *ctx)
+static int keys_fill(struct lu_context *ctx)
{
int i;
struct lu_context_key *key;
key = lu_keys[i];
- if (ctx->lc_value[i] == NULL &&
- key != NULL && key->lct_tags & ctx->lc_tags) {
+ if (ctx->lc_value[i] == NULL && key != NULL &&
+ (key->lct_tags & ctx->lc_tags) &&
+ /*
+ * Don't create values for a LCT_QUIESCENT key, as this
+ * will pin module owning a key.
+ */
+ !(key->lct_tags & LCT_QUIESCENT)) {
void *value;
- LASSERT(key->lct_init != NULL);
- LASSERT(key->lct_index == i);
+ LINVRNT(key->lct_init != NULL);
+ LINVRNT(key->lct_index == i);
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);
+ lu_ref_add_atomic(&key->lct_reference, "ctx", ctx);
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
+ * value.
+ */
ctx->lc_value[i] = value;
+ if (key->lct_exit != NULL)
+ ctx->lc_tags |= LCT_HAS_EXIT;
}
+ ctx->lc_version = key_set_version;
}
return 0;
}
return result;
}
-/*
+/**
* Initialize context data-structure. Create values for all keys.
*/
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);
}
EXPORT_SYMBOL(lu_context_init);
-/*
+/**
* Finalize context data-structure. Destroy key values.
*/
void lu_context_fini(struct lu_context *ctx)
{
- LASSERT(ctx->lc_state == LCS_INITIALIZED || ctx->lc_state == LCS_LEFT);
+ 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);
}
EXPORT_SYMBOL(lu_context_fini);
-/*
+/**
* Called before entering context.
*/
void lu_context_enter(struct lu_context *ctx)
{
- LASSERT(ctx->lc_state == LCS_INITIALIZED || ctx->lc_state == LCS_LEFT);
+ LINVRNT(ctx->lc_state == LCS_INITIALIZED || ctx->lc_state == LCS_LEFT);
ctx->lc_state = LCS_ENTERED;
}
EXPORT_SYMBOL(lu_context_enter);
-/*
- * Called after exiting from @ctx
+/**
+ * Called after exiting from \a ctx
*/
void lu_context_exit(struct lu_context *ctx)
{
int i;
- LASSERT(ctx->lc_state == LCS_ENTERED);
+ LINVRNT(ctx->lc_state == LCS_ENTERED);
ctx->lc_state = LCS_LEFT;
- if (ctx->lc_value != NULL) {
+ if (ctx->lc_tags & LCT_HAS_EXIT && ctx->lc_value != NULL) {
for (i = 0; i < ARRAY_SIZE(lu_keys); ++i) {
if (ctx->lc_value[i] != NULL) {
struct lu_context_key *key;
}
EXPORT_SYMBOL(lu_context_exit);
-/*
+/**
* Allocate for context all missing keys that were registered after context
* creation.
*/
-int lu_context_refill(const struct lu_context *ctx)
+int lu_context_refill(struct lu_context *ctx)
{
- LASSERT(ctx->lc_value != NULL);
- return keys_fill(ctx);
+ LINVRNT(ctx->lc_value != NULL);
+ return 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)
+int lu_env_init(struct lu_env *env, __u32 tags)
{
int result;
- LASSERT(ergo(!noref, !(tags & LCT_NOREF)));
-
- env->le_ses = ses;
+ env->le_ses = NULL;
result = lu_context_init(&env->le_ctx, tags);
if (likely(result == 0))
lu_context_enter(&env->le_ctx);
return result;
}
-
-static int lu_env_init_noref(struct lu_env *env, struct lu_context *ses,
- __u32 tags)
-{
- return lu_env_setup(env, ses, tags, 1);
-}
-
-int lu_env_init(struct lu_env *env, struct lu_context *ses, __u32 tags)
-{
- return lu_env_setup(env, ses, tags, 0);
-}
EXPORT_SYMBOL(lu_env_init);
void lu_env_fini(struct lu_env *env)
}
EXPORT_SYMBOL(lu_env_fini);
+int lu_env_refill(struct lu_env *env)
+{
+ int result;
+
+ result = lu_context_refill(&env->le_ctx);
+ if (result == 0 && env->le_ses != NULL)
+ result = lu_context_refill(env->le_ses);
+ return result;
+}
+EXPORT_SYMBOL(lu_env_refill);
+
+static struct shrinker *lu_site_shrinker = NULL;
+
+#ifdef __KERNEL__
static int lu_cache_shrink(int nr, unsigned int gfp_mask)
{
struct lu_site *s;
int remain = nr;
CFS_LIST_HEAD(splice);
- if (nr != 0 && !(gfp_mask & __GFP_FS))
- return -1;
+ if (nr != 0) {
+ if (!(gfp_mask & __GFP_FS))
+ return -1;
+ CDEBUG(D_INODE, "Shrink %d objects\n", nr);
+ }
down(&lu_sites_guard);
list_for_each_entry_safe(s, tmp, &lu_sites, ls_linkage) {
read_lock(&s->ls_guard);
cached += s->ls_total - s->ls_busy;
read_unlock(&s->ls_guard);
- if (remain <= 0)
+ if (nr && remain <= 0)
break;
}
list_splice(&splice, lu_sites.prev);
up(&lu_sites_guard);
+
+ cached = (cached / 100) * sysctl_vfs_cache_pressure;
+ if (nr == 0)
+ CDEBUG(D_INODE, "%d objects cached\n", cached);
return cached;
}
-static struct shrinker *lu_site_shrinker = NULL;
-
/*
+ * 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;
+}
+
+void lu_debugging_setup(void)
+{
+ 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("[%i]: %p %x (%p,%p,%p) %i %i \"%s\"@%p\n",
+ i, key, key->lct_tags,
+ key->lct_init, key->lct_fini, key->lct_exit,
+ key->lct_index, 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)
+{
+ return 0;
+}
+#endif /* __KERNEL__ */
+
+int cl_global_init(void);
+void cl_global_fini(void);
+int lu_ref_global_init(void);
+void lu_ref_global_fini(void);
+
+int dt_global_init(void);
+void dt_global_fini(void);
+
+int llo_global_init(void);
+void llo_global_fini(void);
+
+/**
* Initialization of global lu_* data.
*/
int lu_global_init(void)
{
int result;
+ CDEBUG(D_CONSOLE, "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) {
- /*
- * 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);
- if (result == 0) {
- /*
- * 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);
- if (result == 0)
- result = lu_time_global_init();
- }
- }
+ 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(&lu_shrink_env, LCT_SHRINKER);
+ up(&lu_sites_guard);
+ 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);
+ if (lu_site_shrinker == NULL)
+ return -ENOMEM;
+
+ result = lu_time_global_init();
+ if (result)
+ GOTO(out, result);
+
+#ifdef __KERNEL__
+ result = dt_global_init();
+ if (result)
+ GOTO(out, result);
+
+ result = llo_global_init();
+ if (result)
+ GOTO(out, result);
+#endif
+ result = cl_global_init();
+out:
+
return result;
}
-/*
+/**
* Dual to lu_global_init().
*/
void lu_global_fini(void)
{
+ cl_global_fini();
+#ifdef __KERNEL__
+ llo_global_fini();
+ dt_global_fini();
+#endif
lu_time_global_fini();
if (lu_site_shrinker != NULL) {
remove_shrinker(lu_site_shrinker);
down(&lu_sites_guard);
lu_env_fini(&lu_shrink_env);
up(&lu_sites_guard);
+
+ lu_ref_global_fini();
}
struct lu_buf LU_BUF_NULL = {
};
EXPORT_SYMBOL(LU_BUF_NULL);
-/*
- * XXX: Functions below logically belong to fid module, but they are used by
- * dt_store_open(). Put them here until better place is found.
+/**
+ * Output site statistical counters into a buffer. Suitable for
+ * lprocfs_rd_*()-style functions.
*/
-
-void fid_pack(struct lu_fid_pack *pack, const struct lu_fid *fid,
- struct lu_fid *befider)
+int lu_site_stats_print(const struct lu_site *s, char *page, int count)
{
- int recsize;
- __u64 seq;
- __u32 oid;
-
- seq = fid_seq(fid);
- oid = fid_oid(fid);
-
- /*
- * Two cases: compact 6 bytes representation for a common case, and
- * full 17 byte representation for "unusual" fid.
- */
+ int i;
+ int populated;
/*
- * Check that usual case is really usual.
+ * How many hash buckets are not-empty? Don't bother with locks: it's
+ * an estimation anyway.
*/
- CLASSERT(LUSTRE_SEQ_MAX_WIDTH < 0xffffull);
-
- 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;
-
- small_befider = (char *)befider;
-
- small_befider[0] = seq >> 16;
- small_befider[1] = seq >> 8;
- small_befider[2] = seq;
-
- small_befider[3] = oid >> 8;
- small_befider[4] = oid;
-
- recsize = 5;
- }
- memcpy(pack->fp_area, befider, recsize);
- pack->fp_len = recsize + 1;
+ for (i = 0, populated = 0; i < s->ls_hash_size; i++)
+ populated += !hlist_empty(&s->ls_hash[i]);
+
+ return snprintf(page, count, "%d %d %d/%d %d %d %d %d %d %d %d\n",
+ s->ls_total,
+ s->ls_busy,
+ populated,
+ s->ls_hash_size,
+ s->ls_stats.s_created,
+ s->ls_stats.s_cache_hit,
+ s->ls_stats.s_cache_miss,
+ s->ls_stats.s_cache_check,
+ s->ls_stats.s_cache_race,
+ s->ls_stats.s_cache_death_race,
+ s->ls_stats.s_lru_purged);
}
-EXPORT_SYMBOL(fid_pack);
+EXPORT_SYMBOL(lu_site_stats_print);
+
+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);
-int fid_unpack(const struct lu_fid_pack *pack, struct lu_fid *fid)
+/**
+ * Helper function to initialize a number of kmem slab caches at once.
+ */
+int lu_kmem_init(struct lu_kmem_descr *caches)
{
int result;
- 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;
+ for (result = 0; caches->ckd_cache != NULL; ++caches) {
+ *caches->ckd_cache = cfs_mem_cache_create(caches->ckd_name,
+ caches->ckd_size,
+ 0, 0);
+ if (*caches->ckd_cache == NULL) {
+ result = -ENOMEM;
+ break;
+ }
}
return result;
}
-EXPORT_SYMBOL(fid_unpack);
+EXPORT_SYMBOL(lu_kmem_init);
-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);
+/**
+ * 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 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);
git://git.whamcloud.com / fs / lustre-release.git / blobdiff