-/* -*- 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.
* Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
- * Copyright (c) 2011, 2012, Whamcloud, Inc.
+ * 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 <obd_class.h>
static void cl_page_delete0(const struct lu_env *env, struct cl_page *pg,
int radix);
-static cfs_mem_cache_t *cl_page_kmem = NULL;
-
-static struct lu_kmem_descr cl_page_caches[] = {
- {
- .ckd_cache = &cl_page_kmem,
- .ckd_name = "cl_page_kmem",
- .ckd_size = sizeof (struct cl_page)
- },
- {
- .ckd_cache = NULL
- }
-};
-
#ifdef LIBCFS_DEBUG
# define PASSERT(env, page, expr) \
do { \
((void)sizeof(env), (void)sizeof(page), (void)sizeof !!(exp))
#endif /* !INVARIANT_CHECK */
+/* Disable page statistic by default due to huge performance penalty. */
+#ifdef CONFIG_DEBUG_PAGESTATE_TRACKING
+#define CS_PAGE_INC(o, item) \
+ cfs_atomic_inc(&cl_object_site(o)->cs_pages.cs_stats[CS_##item])
+#define CS_PAGE_DEC(o, item) \
+ cfs_atomic_dec(&cl_object_site(o)->cs_pages.cs_stats[CS_##item])
+#define CS_PAGESTATE_INC(o, state) \
+ cfs_atomic_inc(&cl_object_site(o)->cs_pages_state[state])
+#define CS_PAGESTATE_DEC(o, state) \
+ cfs_atomic_dec(&cl_object_site(o)->cs_pages_state[state])
+#else
+#define CS_PAGE_INC(o, item)
+#define CS_PAGE_DEC(o, item)
+#define CS_PAGESTATE_INC(o, state)
+#define CS_PAGESTATE_DEC(o, state)
+#endif
+
/**
- * Internal version of cl_page_top, it should be called with page referenced,
- * or coh_page_guard held.
+ * Internal version of cl_page_top, it should be called if the page is
+ * known to be not freed, says with page referenced, or radix tree lock held,
+ * or page owned.
*/
static struct cl_page *cl_page_top_trusted(struct cl_page *page)
{
*/
static void cl_page_get_trust(struct cl_page *page)
{
- /*
- * Checkless version for trusted users.
- */
- if (cfs_atomic_inc_return(&page->cp_ref) == 1)
- cfs_atomic_inc(&cl_object_site(page->cp_obj)->cs_pages.cs_busy);
+ LASSERT(cfs_atomic_read(&page->cp_ref) > 0);
+ cfs_atomic_inc(&page->cp_ref);
}
/**
const struct lu_device_type *dtype)
{
const struct cl_page_slice *slice;
-
-#ifdef INVARIANT_CHECK
- struct cl_object_header *ch = cl_object_header(page->cp_obj);
-
- if (!cfs_atomic_read(&page->cp_ref))
- LASSERT_SPIN_LOCKED(&ch->coh_page_guard);
-#endif
ENTRY;
page = cl_page_top_trusted((struct cl_page *)page);
LASSERT_SPIN_LOCKED(&hdr->coh_page_guard);
page = radix_tree_lookup(&hdr->coh_tree, index);
- if (page != NULL) {
+ if (page != NULL)
cl_page_get_trust(page);
- }
return page;
}
EXPORT_SYMBOL(cl_page_lookup);
hdr = cl_object_header(obj);
pvec = cl_env_info(env)->clt_pvec;
dtype = cl_object_top(obj)->co_lu.lo_dev->ld_type;
- cfs_spin_lock(&hdr->coh_page_guard);
+ spin_lock(&hdr->coh_page_guard);
while ((nr = radix_tree_gang_lookup(&hdr->coh_tree, (void **)pvec,
idx, CLT_PVEC_SIZE)) > 0) {
int end_of_region = 0;
* check that pages weren't truncated (cl_page_own() returns
* error in the latter case).
*/
- cfs_spin_unlock(&hdr->coh_page_guard);
+ spin_unlock(&hdr->coh_page_guard);
tree_lock = 0;
for (i = 0; i < j; ++i) {
if (res != CLP_GANG_OKAY)
break;
- cfs_spin_lock(&hdr->coh_page_guard);
- tree_lock = 1;
- }
- if (tree_lock)
- cfs_spin_unlock(&hdr->coh_page_guard);
- RETURN(res);
+ spin_lock(&hdr->coh_page_guard);
+ tree_lock = 1;
+ }
+ if (tree_lock)
+ spin_unlock(&hdr->coh_page_guard);
+ RETURN(res);
}
EXPORT_SYMBOL(cl_page_gang_lookup);
static void cl_page_free(const struct lu_env *env, struct cl_page *page)
{
struct cl_object *obj = page->cp_obj;
- struct cl_site *site = cl_object_site(obj);
+ int pagesize = cl_object_header(obj)->coh_page_bufsize;
PASSERT(env, page, cfs_list_empty(&page->cp_batch));
PASSERT(env, page, page->cp_owner == NULL);
cfs_list_del_init(page->cp_layers.next);
slice->cpl_ops->cpo_fini(env, slice);
}
- cfs_atomic_dec(&site->cs_pages.cs_total);
-
-#ifdef LUSTRE_PAGESTATE_TRACKING
- cfs_atomic_dec(&site->cs_pages_state[page->cp_state]);
-#endif
+ CS_PAGE_DEC(obj, total);
+ CS_PAGESTATE_DEC(obj, page->cp_state);
lu_object_ref_del_at(&obj->co_lu, page->cp_obj_ref, "cl_page", page);
cl_object_put(env, obj);
lu_ref_fini(&page->cp_reference);
- OBD_SLAB_FREE_PTR(page, cl_page_kmem);
+ OBD_FREE(page, pagesize);
EXIT;
}
*(enum cl_page_state *)&page->cp_state = state;
}
-static int cl_page_alloc(const struct lu_env *env, struct cl_object *o,
- pgoff_t ind, struct page *vmpage,
- enum cl_page_type type, struct cl_page **out)
+static struct cl_page *cl_page_alloc(const struct lu_env *env,
+ struct cl_object *o, pgoff_t ind, struct page *vmpage,
+ enum cl_page_type type)
{
- struct cl_page *page;
- struct cl_page *err = NULL;
- struct lu_object_header *head;
- struct cl_site *site = cl_object_site(o);
- int result;
-
- ENTRY;
- result = +1;
- OBD_SLAB_ALLOC_PTR_GFP(page, cl_page_kmem, CFS_ALLOC_IO);
- if (page != NULL) {
- cfs_atomic_set(&page->cp_ref, 1);
- page->cp_obj = o;
- cl_object_get(o);
- page->cp_obj_ref = lu_object_ref_add(&o->co_lu,
- "cl_page", page);
- page->cp_index = ind;
- cl_page_state_set_trust(page, CPS_CACHED);
- page->cp_type = type;
- CFS_INIT_LIST_HEAD(&page->cp_layers);
- CFS_INIT_LIST_HEAD(&page->cp_batch);
- CFS_INIT_LIST_HEAD(&page->cp_flight);
- cfs_mutex_init(&page->cp_mutex);
- lu_ref_init(&page->cp_reference);
- head = o->co_lu.lo_header;
- cfs_list_for_each_entry(o, &head->loh_layers,
- co_lu.lo_linkage) {
- if (o->co_ops->coo_page_init != NULL) {
- err = o->co_ops->coo_page_init(env, o,
- page, vmpage);
- if (err != NULL) {
- cl_page_delete0(env, page, 0);
- cl_page_free(env, page);
- page = err;
- break;
- }
- }
- }
- if (err == NULL) {
- cfs_atomic_inc(&site->cs_pages.cs_busy);
- cfs_atomic_inc(&site->cs_pages.cs_total);
-
-#ifdef LUSTRE_PAGESTATE_TRACKING
- cfs_atomic_inc(&site->cs_pages_state[CPS_CACHED]);
-#endif
- cfs_atomic_inc(&site->cs_pages.cs_created);
- result = 0;
- }
- } else
- page = ERR_PTR(-ENOMEM);
- *out = page;
- RETURN(result);
+ struct cl_page *page;
+ struct lu_object_header *head;
+
+ ENTRY;
+ OBD_ALLOC_GFP(page, cl_object_header(o)->coh_page_bufsize,
+ CFS_ALLOC_IO);
+ if (page != NULL) {
+ int result;
+ cfs_atomic_set(&page->cp_ref, 1);
+ if (type == CPT_CACHEABLE) /* for radix tree */
+ cfs_atomic_inc(&page->cp_ref);
+ page->cp_obj = o;
+ cl_object_get(o);
+ page->cp_obj_ref = lu_object_ref_add(&o->co_lu, "cl_page",page);
+ page->cp_index = ind;
+ cl_page_state_set_trust(page, CPS_CACHED);
+ page->cp_type = type;
+ CFS_INIT_LIST_HEAD(&page->cp_layers);
+ CFS_INIT_LIST_HEAD(&page->cp_batch);
+ CFS_INIT_LIST_HEAD(&page->cp_flight);
+ mutex_init(&page->cp_mutex);
+ lu_ref_init(&page->cp_reference);
+ head = o->co_lu.lo_header;
+ cfs_list_for_each_entry(o, &head->loh_layers,
+ co_lu.lo_linkage) {
+ if (o->co_ops->coo_page_init != NULL) {
+ result = o->co_ops->coo_page_init(env, o,
+ page, vmpage);
+ if (result != 0) {
+ cl_page_delete0(env, page, 0);
+ cl_page_free(env, page);
+ page = ERR_PTR(result);
+ break;
+ }
+ }
+ }
+ if (result == 0) {
+ CS_PAGE_INC(o, total);
+ CS_PAGE_INC(o, create);
+ CS_PAGESTATE_DEC(o, CPS_CACHED);
+ }
+ } else {
+ page = ERR_PTR(-ENOMEM);
+ }
+ RETURN(page);
}
/**
struct cl_page *page = NULL;
struct cl_page *ghost = NULL;
struct cl_object_header *hdr;
- struct cl_site *site = cl_object_site(o);
int err;
LASSERT(type == CPT_CACHEABLE || type == CPT_TRANSIENT);
ENTRY;
hdr = cl_object_header(o);
- cfs_atomic_inc(&site->cs_pages.cs_lookup);
+ CS_PAGE_INC(o, lookup);
CDEBUG(D_PAGE, "%lu@"DFID" %p %lx %d\n",
idx, PFID(&hdr->coh_lu.loh_fid), vmpage, vmpage->private, type);
/* fast path. */
if (type == CPT_CACHEABLE) {
+ /* vmpage lock is used to protect the child/parent
+ * relationship */
+ KLASSERT(PageLocked(vmpage));
/*
* cl_vmpage_page() can be called here without any locks as
*
}
if (page != NULL) {
- cfs_atomic_inc(&site->cs_pages.cs_hit);
+ CS_PAGE_INC(o, hit);
RETURN(page);
}
/* allocate and initialize cl_page */
- err = cl_page_alloc(env, o, idx, vmpage, type, &page);
- if (err != 0)
+ page = cl_page_alloc(env, o, idx, vmpage, type);
+ if (IS_ERR(page))
RETURN(page);
if (type == CPT_TRANSIENT) {
* XXX optimization: use radix_tree_preload() here, and change tree
* gfp mask to GFP_KERNEL in cl_object_header_init().
*/
- cfs_spin_lock(&hdr->coh_page_guard);
+ spin_lock(&hdr->coh_page_guard);
err = radix_tree_insert(&hdr->coh_tree, idx, page);
if (err != 0) {
ghost = page;
}
hdr->coh_pages++;
}
- cfs_spin_unlock(&hdr->coh_page_guard);
+ spin_unlock(&hdr->coh_page_guard);
if (unlikely(ghost != NULL)) {
- cfs_atomic_dec(&site->cs_pages.cs_busy);
cl_page_delete0(env, ghost, 0);
cl_page_free(env, ghost);
}
child = pg->cp_child;
owner = pg->cp_owner;
- return cfs_atomic_read(&pg->cp_ref) > 0 &&
+ return cl_page_in_use(pg) &&
ergo(parent != NULL, parent->cp_child == pg) &&
ergo(child != NULL, child->cp_parent == pg) &&
ergo(child != NULL, pg->cp_obj != child->cp_obj) &&
struct cl_page *page, enum cl_page_state state)
{
enum cl_page_state old;
-#ifdef LUSTRE_PAGESTATE_TRACKING
- struct cl_site *site = cl_object_site(page->cp_obj);
-#endif
/*
* Matrix of allowed state transitions [old][new], for sanity
PASSERT(env, page,
equi(state == CPS_OWNED, page->cp_owner != NULL));
-#ifdef LUSTRE_PAGESTATE_TRACKING
- cfs_atomic_dec(&site->cs_pages_state[page->cp_state]);
- cfs_atomic_inc(&site->cs_pages_state[state]);
-#endif
+ CS_PAGESTATE_DEC(page->cp_obj, page->cp_state);
+ CS_PAGESTATE_INC(page->cp_obj, state);
cl_page_state_set_trust(page, state);
}
EXIT;
*/
void cl_page_get(struct cl_page *page)
{
- ENTRY;
- LASSERT(page->cp_state != CPS_FREEING);
- cl_page_get_trust(page);
- EXIT;
+ ENTRY;
+ cl_page_get_trust(page);
+ EXIT;
}
EXPORT_SYMBOL(cl_page_get);
*/
void cl_page_put(const struct lu_env *env, struct cl_page *page)
{
- struct cl_object_header *hdr;
- struct cl_site *site = cl_object_site(page->cp_obj);
-
PASSERT(env, page, cfs_atomic_read(&page->cp_ref) > !!page->cp_parent);
ENTRY;
CL_PAGE_HEADER(D_TRACE, env, page, "%d\n",
cfs_atomic_read(&page->cp_ref));
- hdr = cl_object_header(cl_object_top(page->cp_obj));
- if (cfs_atomic_dec_and_lock(&page->cp_ref, &hdr->coh_page_guard)) {
- cfs_atomic_dec(&site->cs_pages.cs_busy);
- /* We're going to access the page w/o a reference, but it's
- * ok because we have grabbed the lock coh_page_guard, which
- * means nobody is able to free this page behind us.
- */
- if (page->cp_state == CPS_FREEING) {
- /* We drop the page reference and check the page state
- * inside the coh_page_guard. So that if it gets here,
- * it is the REALLY last reference to this page.
- */
- cfs_spin_unlock(&hdr->coh_page_guard);
-
- LASSERT(cfs_atomic_read(&page->cp_ref) == 0);
- PASSERT(env, page, page->cp_owner == NULL);
- PASSERT(env, page, cfs_list_empty(&page->cp_batch));
- /*
- * Page is no longer reachable by other threads. Tear
- * it down.
- */
- cl_page_free(env, page);
+ if (cfs_atomic_dec_and_test(&page->cp_ref)) {
+ LASSERT(page->cp_state == CPS_FREEING);
- EXIT;
- return;
- }
- cfs_spin_unlock(&hdr->coh_page_guard);
- }
+ LASSERT(cfs_atomic_read(&page->cp_ref) == 0);
+ PASSERT(env, page, page->cp_owner == NULL);
+ PASSERT(env, page, cfs_list_empty(&page->cp_batch));
+ /*
+ * Page is no longer reachable by other threads. Tear
+ * it down.
+ */
+ cl_page_free(env, page);
+ }
- EXIT;
+ EXIT;
}
EXPORT_SYMBOL(cl_page_put);
*/
struct cl_page *cl_vmpage_page(cfs_page_t *vmpage, struct cl_object *obj)
{
- struct cl_page *page;
- struct cl_object_header *hdr;
+ struct cl_page *top;
+ struct cl_page *page;
ENTRY;
KLASSERT(PageLocked(vmpage));
* This loop assumes that ->private points to the top-most page. This
* can be rectified easily.
*/
- hdr = cl_object_header(cl_object_top(obj));
- cfs_spin_lock(&hdr->coh_page_guard);
- for (page = (void *)vmpage->private;
- page != NULL; page = page->cp_child) {
- if (cl_object_same(page->cp_obj, obj)) {
- cl_page_get_trust(page);
- break;
- }
- }
- cfs_spin_unlock(&hdr->coh_page_guard);
- LASSERT(ergo(page, page->cp_type == CPT_CACHEABLE));
- RETURN(page);
+ top = (struct cl_page *)vmpage->private;
+ if (top == NULL)
+ RETURN(NULL);
+
+ for (page = top; page != NULL; page = page->cp_child) {
+ if (cl_object_same(page->cp_obj, obj)) {
+ cl_page_get_trust(page);
+ break;
+ }
+ }
+ LASSERT(ergo(page, page->cp_type == CPT_CACHEABLE));
+ RETURN(page);
}
EXPORT_SYMBOL(cl_vmpage_page);
void cl_page_assume(const struct lu_env *env,
struct cl_io *io, struct cl_page *pg)
{
- PASSERT(env, pg, pg->cp_owner == NULL);
PINVRNT(env, pg, cl_object_same(pg->cp_obj, io->ci_obj));
- PINVRNT(env, pg, cl_page_invariant(pg));
ENTRY;
pg = cl_page_top(pg);
io = cl_io_top(io);
cl_page_invoid(env, io, pg, CL_PAGE_OP(cpo_assume));
+ PASSERT(env, pg, pg->cp_owner == NULL);
pg->cp_owner = io;
pg->cp_task = current;
cl_page_owner_set(pg);
cl_page_export(env, pg, 0);
cl_page_state_set0(env, pg, CPS_FREEING);
+ CL_PAGE_INVOID(env, pg, CL_PAGE_OP(cpo_delete),
+ (const struct lu_env *, const struct cl_page_slice *));
+
if (tmp->cp_type == CPT_CACHEABLE) {
if (!radix)
/* !radix means that @pg is not yet in the radix tree,
struct cl_object_header *hdr;
hdr = cl_object_header(tmp->cp_obj);
- cfs_spin_lock(&hdr->coh_page_guard);
- value = radix_tree_delete(&hdr->coh_tree,
- tmp->cp_index);
- PASSERT(env, tmp, value == tmp);
- PASSERT(env, tmp, hdr->coh_pages > 0);
- hdr->coh_pages--;
- cfs_spin_unlock(&hdr->coh_page_guard);
+ spin_lock(&hdr->coh_page_guard);
+ value = radix_tree_delete(&hdr->coh_tree,
+ tmp->cp_index);
+ PASSERT(env, tmp, value == tmp);
+ PASSERT(env, tmp, hdr->coh_pages > 0);
+ hdr->coh_pages--;
+ spin_unlock(&hdr->coh_page_guard);
+ cl_page_put(env, tmp);
}
}
- CL_PAGE_INVOID(env, pg, CL_PAGE_OP(cpo_delete),
- (const struct lu_env *, const struct cl_page_slice *));
EXIT;
}
LASSERT(cl_page_is_vmlocked(env, pg));
LASSERT(pg->cp_sync_io == anchor);
pg->cp_sync_io = NULL;
+ }
+ /*
+ * As page->cp_obj is pinned by a reference from page->cp_req, it is
+ * safe to call cl_page_put() without risking object destruction in a
+ * non-blocking context.
+ */
+ cl_page_put(env, pg);
+
+ if (anchor)
cl_sync_io_note(anchor, ioret);
- }
- /* Don't assert the page writeback bit here because the lustre file
- * may be as a backend of swap space. in this case, the page writeback
- * is set by VM, and obvious we shouldn't clear it at all. Fortunately
- * this type of pages are all TRANSIENT pages. */
- KLASSERT(ergo(pg->cp_type == CPT_CACHEABLE,
- !PageWriteback(cl_page_vmpage(env, pg))));
EXIT;
}
EXPORT_SYMBOL(cl_page_completion);
* its queues.
*
* \pre cl_page_is_owned(pg, io)
- * \post ergo(result == 0,
- * pg->cp_state == CPS_PAGEIN || pg->cp_state == CPS_PAGEOUT)
+ * \post cl_page_is_owned(pg, io)
*
* \see cl_page_operations::cpo_cache_add()
*/
int cl_page_cache_add(const struct lu_env *env, struct cl_io *io,
struct cl_page *pg, enum cl_req_type crt)
{
- int result;
+ const struct cl_page_slice *scan;
+ int result = 0;
- PINVRNT(env, pg, crt < CRT_NR);
- PINVRNT(env, pg, cl_page_is_owned(pg, io));
- PINVRNT(env, pg, cl_page_invariant(pg));
+ PINVRNT(env, pg, crt < CRT_NR);
+ PINVRNT(env, pg, cl_page_is_owned(pg, io));
+ PINVRNT(env, pg, cl_page_invariant(pg));
- ENTRY;
- result = cl_page_invoke(env, io, pg, CL_PAGE_OP(io[crt].cpo_cache_add));
- if (result == 0) {
- cl_page_owner_clear(pg);
- cl_page_state_set(env, pg, CPS_CACHED);
- }
- CL_PAGE_HEADER(D_TRACE, env, pg, "%d %d\n", crt, result);
- RETURN(result);
+ ENTRY;
+
+ cfs_list_for_each_entry(scan, &pg->cp_layers, cpl_linkage) {
+ if (scan->cpl_ops->io[crt].cpo_cache_add == NULL)
+ continue;
+
+ result = scan->cpl_ops->io[crt].cpo_cache_add(env, scan, io);
+ if (result != 0)
+ break;
+ }
+ CL_PAGE_HEADER(D_TRACE, env, pg, "%d %d\n", crt, result);
+ RETURN(result);
}
EXPORT_SYMBOL(cl_page_cache_add);
/**
+ * Called if a pge is being written back by kernel's intention.
+ *
+ * \pre cl_page_is_owned(pg, io)
+ * \post ergo(result == 0, pg->cp_state == CPS_PAGEOUT)
+ *
+ * \see cl_page_operations::cpo_flush()
+ */
+int cl_page_flush(const struct lu_env *env, struct cl_io *io,
+ struct cl_page *pg)
+{
+ int result;
+
+ PINVRNT(env, pg, cl_page_is_owned(pg, io));
+ PINVRNT(env, pg, cl_page_invariant(pg));
+
+ ENTRY;
+
+ result = cl_page_invoke(env, io, pg, CL_PAGE_OP(cpo_flush));
+
+ CL_PAGE_HEADER(D_TRACE, env, pg, "%d\n", result);
+ RETURN(result);
+}
+EXPORT_SYMBOL(cl_page_flush);
+
+/**
* Checks whether page is protected by any extent lock is at least required
* mode.
*
* function, we just make cl_page_list functions happy. -jay
*/
io->ci_obj = obj;
+ io->ci_ignore_layout = 1;
result = cl_io_init(env, io, CIT_MISC, obj);
if (result != 0) {
cl_io_fini(env, io);
int cl_page_init(void)
{
- return lu_kmem_init(cl_page_caches);
+ return 0;
}
void cl_page_fini(void)
{
- lu_kmem_fini(cl_page_caches);
}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff