-/* -*- 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) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
+ *
+ * Copyright (c) 2011, 2012, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
*/
#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)
{
- LASSERT(cl_is_page(page));
while (page->cp_parent != NULL)
page = page->cp_parent;
return page;
*/
static void cl_page_get_trust(struct cl_page *page)
{
- LASSERT(cl_is_page(page));
- /*
- * Checkless version for trusted users.
- */
- if (atomic_inc_return(&page->cp_ref) == 1)
- 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 (!atomic_read(&page->cp_ref))
- LASSERT_SPIN_LOCKED(&ch->coh_page_guard);
-#endif
ENTRY;
page = cl_page_top_trusted((struct cl_page *)page);
do {
- list_for_each_entry(slice, &page->cp_layers, cpl_linkage) {
+ cfs_list_for_each_entry(slice, &page->cp_layers, cpl_linkage) {
if (slice->cpl_obj->co_lu.lo_dev->ld_type == dtype)
RETURN(slice);
}
LASSERT_SPIN_LOCKED(&hdr->coh_page_guard);
page = radix_tree_lookup(&hdr->coh_tree, index);
- if (page != NULL) {
- LASSERT(cl_is_page(page));
+ if (page != NULL)
cl_page_get_trust(page);
- }
return page;
}
EXPORT_SYMBOL(cl_page_lookup);
/**
- * Returns a list of pages by a given [start, end] of @obj.
+ * Returns a list of pages by a given [start, end] of \a obj.
+ *
+ * \param resched If not NULL, then we give up before hogging CPU for too
+ * long and set *resched = 1, in that case caller should implement a retry
+ * logic.
*
* Gang tree lookup (radix_tree_gang_lookup()) optimization is absolutely
* crucial in the face of [offset, EOF] locks.
+ *
+ * Return at least one page in @queue unless there is no covered page.
*/
-void cl_page_gang_lookup(const struct lu_env *env, struct cl_object *obj,
- struct cl_io *io, pgoff_t start, pgoff_t end,
- struct cl_page_list *queue)
+int cl_page_gang_lookup(const struct lu_env *env, struct cl_object *obj,
+ struct cl_io *io, pgoff_t start, pgoff_t end,
+ cl_page_gang_cb_t cb, void *cbdata)
{
struct cl_object_header *hdr;
struct cl_page *page;
unsigned int nr;
unsigned int i;
unsigned int j;
+ int res = CLP_GANG_OKAY;
+ int tree_lock = 1;
ENTRY;
idx = start;
hdr = cl_object_header(obj);
pvec = cl_env_info(env)->clt_pvec;
dtype = cl_object_top(obj)->co_lu.lo_dev->ld_type;
- 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;
idx = pvec[nr - 1]->cp_index + 1;
for (i = 0, j = 0; i < nr; ++i) {
page = pvec[i];
- PASSERT(env, page, cl_is_page(page));
pvec[i] = NULL;
- if (page->cp_index > end)
+
+ LASSERT(page->cp_type == CPT_CACHEABLE);
+ if (page->cp_index > end) {
+ end_of_region = 1;
break;
+ }
if (page->cp_state == CPS_FREEING)
continue;
- if (page->cp_type == CPT_TRANSIENT) {
- /* God, we found a transient page!*/
- continue;
- }
slice = cl_page_at_trusted(page, dtype);
/*
* for osc, in case of ...
*/
PASSERT(env, page, slice != NULL);
+
page = slice->cpl_page;
/*
* Can safely call cl_page_get_trust() under
*/
cl_page_get_trust(page);
lu_ref_add_atomic(&page->cp_reference,
- "page_list", cfs_current());
+ "gang_lookup", cfs_current());
pvec[j++] = page;
}
* check that pages weren't truncated (cl_page_own() returns
* error in the latter case).
*/
- spin_unlock(&hdr->coh_page_guard);
+ spin_unlock(&hdr->coh_page_guard);
+ tree_lock = 0;
+
for (i = 0; i < j; ++i) {
page = pvec[i];
- if (cl_page_own(env, io, page) == 0)
- cl_page_list_add(queue, page);
+ if (res == CLP_GANG_OKAY)
+ res = (*cb)(env, io, page, cbdata);
lu_ref_del(&page->cp_reference,
- "page_list", cfs_current());
+ "gang_lookup", cfs_current());
cl_page_put(env, page);
}
- spin_lock(&hdr->coh_page_guard);
- if (nr < CLT_PVEC_SIZE)
+ if (nr < CLT_PVEC_SIZE || end_of_region)
break;
- }
- spin_unlock(&hdr->coh_page_guard);
- EXIT;
+
+ if (res == CLP_GANG_OKAY && cfs_need_resched())
+ res = CLP_GANG_RESCHED;
+ if (res != CLP_GANG_OKAY)
+ break;
+
+ 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, cl_is_page(page));
- PASSERT(env, page, list_empty(&page->cp_batch));
+ PASSERT(env, page, cfs_list_empty(&page->cp_batch));
PASSERT(env, page, page->cp_owner == NULL);
PASSERT(env, page, page->cp_req == NULL);
PASSERT(env, page, page->cp_parent == NULL);
PASSERT(env, page, page->cp_state == CPS_FREEING);
ENTRY;
- might_sleep();
- while (!list_empty(&page->cp_layers)) {
+ cfs_might_sleep();
+ while (!cfs_list_empty(&page->cp_layers)) {
struct cl_page_slice *slice;
- slice = list_entry(page->cp_layers.next, struct cl_page_slice,
- cpl_linkage);
- list_del_init(page->cp_layers.next);
+ slice = cfs_list_entry(page->cp_layers.next,
+ struct cl_page_slice, cpl_linkage);
+ cfs_list_del_init(page->cp_layers.next);
slice->cpl_ops->cpo_fini(env, slice);
}
- atomic_dec(&site->cs_pages.cs_total);
- atomic_dec(&site->cs_pages_state[page->cp_state]);
+ 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) {
- 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);
- mutex_init(&page->cp_mutex);
- lu_ref_init(&page->cp_reference);
- head = o->co_lu.lo_header;
- 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_state_set_trust(page,
- CPS_FREEING);
- cl_page_free(env, page);
- page = err;
- break;
- }
- }
- }
- if (err == NULL) {
- atomic_inc(&site->cs_pages.cs_busy);
- atomic_inc(&site->cs_pages.cs_total);
- atomic_inc(&site->cs_pages_state[CPS_CACHED]);
- 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);
}
/**
*
* \see cl_object_find(), cl_lock_find()
*/
-struct cl_page *cl_page_find(const struct lu_env *env, struct cl_object *o,
- pgoff_t idx, struct page *vmpage,
- enum cl_page_type type)
+static struct cl_page *cl_page_find0(const struct lu_env *env,
+ struct cl_object *o,
+ pgoff_t idx, struct page *vmpage,
+ enum cl_page_type type,
+ struct cl_page *parent)
{
- struct cl_page *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;
- LINVRNT(type == CPT_CACHEABLE || type == CPT_TRANSIENT);
- might_sleep();
+ LASSERT(type == CPT_CACHEABLE || type == CPT_TRANSIENT);
+ cfs_might_sleep();
ENTRY;
hdr = cl_object_header(o);
- atomic_inc(&site->cs_pages.cs_lookup);
+ CS_PAGE_INC(o, lookup);
- CDEBUG(D_PAGE, "%lu@"DFID" %p %lu %i\n",
+ 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
*
cl_page_vmpage(env, page) == vmpage &&
(void *)radix_tree_lookup(&hdr->coh_tree,
idx) == page));
- } else {
- spin_lock(&hdr->coh_page_guard);
- page = cl_page_lookup(hdr, idx);
- spin_unlock(&hdr->coh_page_guard);
}
+
if (page != NULL) {
- 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) {
+ if (parent) {
+ LASSERT(page->cp_parent == NULL);
+ page->cp_parent = parent;
+ parent->cp_child = page;
+ }
RETURN(page);
+ }
+
/*
* XXX optimization: use radix_tree_preload() here, and change tree
* gfp mask to GFP_KERNEL in cl_object_header_init().
*/
- 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;
* consistent even when VM locking is somehow busted,
* which is very useful during diagnosing and debugging.
*/
- if (err == -EEXIST) {
- /*
- * XXX in case of a lookup for CPT_TRANSIENT page,
- * nothing protects a CPT_CACHEABLE page from being
- * concurrently moved into CPS_FREEING state.
- */
- page = cl_page_lookup(hdr, idx);
- PASSERT(env, page, page != NULL);
- if (page->cp_type == CPT_TRANSIENT &&
- type == CPT_CACHEABLE) {
- /* XXX: We should make sure that inode sem
- * keeps being held in the lifetime of
- * transient pages, so it is impossible to
- * have conflicting transient pages.
- */
- spin_unlock(&hdr->coh_page_guard);
- cl_page_put(env, page);
- spin_lock(&hdr->coh_page_guard);
- page = ERR_PTR(-EBUSY);
- }
- } else
- page = ERR_PTR(err);
- } else
+ page = ERR_PTR(err);
+ CL_PAGE_DEBUG(D_ERROR, env, ghost,
+ "fail to insert into radix tree: %d\n", err);
+ } else {
+ if (parent) {
+ LASSERT(page->cp_parent == NULL);
+ page->cp_parent = parent;
+ parent->cp_child = page;
+ }
hdr->coh_pages++;
- spin_unlock(&hdr->coh_page_guard);
+ }
+ spin_unlock(&hdr->coh_page_guard);
if (unlikely(ghost != NULL)) {
- atomic_dec(&site->cs_pages.cs_busy);
cl_page_delete0(env, ghost, 0);
cl_page_free(env, ghost);
}
RETURN(page);
}
+
+struct cl_page *cl_page_find(const struct lu_env *env, struct cl_object *o,
+ pgoff_t idx, struct page *vmpage,
+ enum cl_page_type type)
+{
+ return cl_page_find0(env, o, idx, vmpage, type, NULL);
+}
EXPORT_SYMBOL(cl_page_find);
+
+struct cl_page *cl_page_find_sub(const struct lu_env *env, struct cl_object *o,
+ pgoff_t idx, struct page *vmpage,
+ struct cl_page *parent)
+{
+ return cl_page_find0(env, o, idx, vmpage, parent->cp_type, parent);
+}
+EXPORT_SYMBOL(cl_page_find_sub);
+
static inline int cl_page_invariant(const struct cl_page *pg)
{
struct cl_object_header *header;
struct cl_page *child;
struct cl_io *owner;
- LASSERT(cl_is_page(pg));
/*
* Page invariant is protected by a VM lock.
*/
child = pg->cp_child;
owner = pg->cp_owner;
- return 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) &&
* Either page is early in initialization (has neither child
* nor parent yet), or it is in the object radix tree.
*/
- ergo(pg->cp_state < CPS_FREEING,
+ ergo(pg->cp_state < CPS_FREEING && pg->cp_type == CPT_CACHEABLE,
(void *)radix_tree_lookup(&header->coh_tree,
pg->cp_index) == pg ||
(child == NULL && parent == NULL));
struct cl_page *page, enum cl_page_state state)
{
enum cl_page_state old;
- struct cl_site *site = cl_object_site(page->cp_obj);
/*
* Matrix of allowed state transitions [old][new], for sanity
ENTRY;
old = page->cp_state;
PASSERT(env, page, allowed_transitions[old][state]);
- CL_PAGE_HEADER(D_TRACE, env, page, "%i -> %i\n", old, state);
+ CL_PAGE_HEADER(D_TRACE, env, page, "%d -> %d\n", old, state);
for (; page != NULL; page = page->cp_child) {
PASSERT(env, page, page->cp_state == old);
PASSERT(env, page,
equi(state == CPS_OWNED, page->cp_owner != NULL));
- atomic_dec(&site->cs_pages_state[page->cp_state]);
- atomic_inc(&site->cs_pages_state[state]);
+ CS_PAGESTATE_DEC(page->cp_obj, page->cp_state);
+ CS_PAGESTATE_INC(page->cp_obj, state);
cl_page_state_set_trust(page, state);
}
EXIT;
static void cl_page_state_set(const struct lu_env *env,
struct cl_page *page, enum cl_page_state state)
{
- PINVRNT(env, page, cl_page_invariant(page));
cl_page_state_set0(env, page, state);
}
*/
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, atomic_read(&page->cp_ref) > !!page->cp_parent);
+ PASSERT(env, page, cfs_atomic_read(&page->cp_ref) > !!page->cp_parent);
ENTRY;
- CL_PAGE_HEADER(D_TRACE, env, page, "%i\n", atomic_read(&page->cp_ref));
- hdr = cl_object_header(page->cp_obj);
- if (atomic_dec_and_test(&page->cp_ref)) {
- atomic_dec(&site->cs_pages.cs_busy);
- if (page->cp_state == CPS_FREEING) {
- PASSERT(env, page, page->cp_owner == NULL);
- PASSERT(env, page, list_empty(&page->cp_batch));
- /*
- * Page is no longer reachable by other threads. Tear
- * it down.
- */
- cl_page_free(env, page);
- }
- }
- EXIT;
+ CL_PAGE_HEADER(D_TRACE, env, page, "%d\n",
+ cfs_atomic_read(&page->cp_ref));
+
+ if (cfs_atomic_dec_and_test(&page->cp_ref)) {
+ LASSERT(page->cp_state == CPS_FREEING);
+
+ 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;
}
EXPORT_SYMBOL(cl_page_put);
*/
page = cl_page_top(page);
do {
- list_for_each_entry(slice, &page->cp_layers, cpl_linkage) {
+ cfs_list_for_each_entry(slice, &page->cp_layers, cpl_linkage) {
if (slice->cpl_ops->cpo_vmpage != NULL)
RETURN(slice->cpl_ops->cpo_vmpage(env, slice));
}
*/
struct cl_page *cl_vmpage_page(cfs_page_t *vmpage, struct cl_object *obj)
{
- struct cl_page *page;
+ 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.
*/
- 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;
- }
- }
- LASSERT(ergo(page, cl_is_page(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);
}
EXPORT_SYMBOL(cl_page_top);
-/**
- * Returns true if \a addr is an address of an allocated cl_page. Used in
- * assertions. This check is optimistically imprecise, i.e., it occasionally
- * returns true for the incorrect addresses, but if it returns false, then the
- * address is guaranteed to be incorrect. (Should be named cl_pagep().)
- *
- * \see cl_is_lock()
- */
-int cl_is_page(const void *addr)
-{
- return cfs_mem_is_in_cache(addr, cl_page_kmem);
-}
-EXPORT_SYMBOL(cl_is_page);
-
const struct cl_page_slice *cl_page_at(const struct cl_page *page,
const struct lu_device_type *dtype)
{
__result = 0; \
__page = cl_page_top(__page); \
do { \
- list_for_each_entry(__scan, &__page->cp_layers, \
- cpl_linkage) { \
+ cfs_list_for_each_entry(__scan, &__page->cp_layers, \
+ cpl_linkage) { \
__method = *(void **)((char *)__scan->cpl_ops + \
__op); \
if (__method != NULL) { \
\
__page = cl_page_top(__page); \
do { \
- list_for_each_entry(__scan, &__page->cp_layers, \
- cpl_linkage) { \
+ cfs_list_for_each_entry(__scan, &__page->cp_layers, \
+ cpl_linkage) { \
__method = *(void **)((char *)__scan->cpl_ops + \
__op); \
if (__method != NULL) \
} while (__page != NULL); \
} while (0)
-#define CL_PAGE_INVOID_REVERSE(_env, _page, _op, _proto, ...) \
-do { \
- const struct lu_env *__env = (_env); \
- struct cl_page *__page = (_page); \
- const struct cl_page_slice *__scan; \
- ptrdiff_t __op = (_op); \
- void (*__method)_proto; \
- \
- /* get to the bottom page. */ \
- while (__page->cp_child != NULL) \
- __page = __page->cp_child; \
- do { \
- list_for_each_entry_reverse(__scan, &__page->cp_layers, \
- cpl_linkage) { \
- __method = *(void **)((char *)__scan->cpl_ops + \
- __op); \
- if (__method != NULL) \
- (*__method)(__env, __scan, \
- ## __VA_ARGS__); \
- } \
- __page = __page->cp_parent; \
- } while (__page != NULL); \
+#define CL_PAGE_INVOID_REVERSE(_env, _page, _op, _proto, ...) \
+do { \
+ const struct lu_env *__env = (_env); \
+ struct cl_page *__page = (_page); \
+ const struct cl_page_slice *__scan; \
+ ptrdiff_t __op = (_op); \
+ void (*__method)_proto; \
+ \
+ /* get to the bottom page. */ \
+ while (__page->cp_child != NULL) \
+ __page = __page->cp_child; \
+ do { \
+ cfs_list_for_each_entry_reverse(__scan, &__page->cp_layers, \
+ cpl_linkage) { \
+ __method = *(void **)((char *)__scan->cpl_ops + \
+ __op); \
+ if (__method != NULL) \
+ (*__method)(__env, __scan, \
+ ## __VA_ARGS__); \
+ } \
+ __page = __page->cp_parent; \
+ } while (__page != NULL); \
} while (0)
static int cl_page_invoke(const struct lu_env *env,
LASSERT(page->cp_owner->ci_owned_nr > 0);
page->cp_owner->ci_owned_nr--;
page->cp_owner = NULL;
+ page->cp_task = NULL;
}
}
EXIT;
EXPORT_SYMBOL(cl_page_is_owned);
/**
- * Owns a page by IO.
+ * Try to own a page by IO.
*
* Waits until page is in cl_page_state::CPS_CACHED state, and then switch it
* into cl_page_state::CPS_OWNED state.
*
* \retval -ve failure, e.g., page was destroyed (and landed in
* cl_page_state::CPS_FREEING instead of cl_page_state::CPS_CACHED).
+ * or, page was owned by another thread, or in IO.
*
* \see cl_page_disown()
* \see cl_page_operations::cpo_own()
+ * \see cl_page_own_try()
+ * \see cl_page_own
*/
-int cl_page_own(const struct lu_env *env, struct cl_io *io, struct cl_page *pg)
+static int cl_page_own0(const struct lu_env *env, struct cl_io *io,
+ struct cl_page *pg, int nonblock)
{
int result;
pg = cl_page_top(pg);
io = cl_io_top(io);
- cl_page_invoid(env, io, pg, CL_PAGE_OP(cpo_own));
- PASSERT(env, pg, pg->cp_owner == NULL);
- PASSERT(env, pg, pg->cp_req == NULL);
- pg->cp_owner = io;
- cl_page_owner_set(pg);
- if (pg->cp_state != CPS_FREEING) {
- cl_page_state_set(env, pg, CPS_OWNED);
- result = 0;
+ if (pg->cp_state == CPS_FREEING) {
+ result = -ENOENT;
} else {
- cl_page_disown0(env, io, pg);
- result = -EAGAIN;
+ result = CL_PAGE_INVOKE(env, pg, CL_PAGE_OP(cpo_own),
+ (const struct lu_env *,
+ const struct cl_page_slice *,
+ struct cl_io *, int),
+ io, nonblock);
+ if (result == 0) {
+ PASSERT(env, pg, pg->cp_owner == NULL);
+ PASSERT(env, pg, pg->cp_req == NULL);
+ pg->cp_owner = io;
+ pg->cp_task = current;
+ cl_page_owner_set(pg);
+ if (pg->cp_state != CPS_FREEING) {
+ cl_page_state_set(env, pg, CPS_OWNED);
+ } else {
+ cl_page_disown0(env, io, pg);
+ result = -ENOENT;
+ }
+ }
}
PINVRNT(env, pg, ergo(result == 0, cl_page_invariant(pg)));
RETURN(result);
}
+
+/**
+ * Own a page, might be blocked.
+ *
+ * \see cl_page_own0()
+ */
+int cl_page_own(const struct lu_env *env, struct cl_io *io, struct cl_page *pg)
+{
+ return cl_page_own0(env, io, pg, 0);
+}
EXPORT_SYMBOL(cl_page_own);
/**
+ * Nonblock version of cl_page_own().
+ *
+ * \see cl_page_own0()
+ */
+int cl_page_own_try(const struct lu_env *env, struct cl_io *io,
+ struct cl_page *pg)
+{
+ return cl_page_own0(env, io, pg, 1);
+}
+EXPORT_SYMBOL(cl_page_own_try);
+
+
+/**
* Assume page ownership.
*
* Called when page is already locked by the hosting VM.
void cl_page_assume(const struct lu_env *env,
struct cl_io *io, struct cl_page *pg)
{
- PASSERT(env, pg, pg->cp_state < CPS_OWNED);
- 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_state_set(env, pg, CPS_OWNED);
EXIT;
static void cl_page_delete0(const struct lu_env *env, struct cl_page *pg,
int radix)
{
+ struct cl_page *tmp = pg;
+ ENTRY;
+
PASSERT(env, pg, pg == cl_page_top(pg));
PASSERT(env, pg, pg->cp_state != CPS_FREEING);
- ENTRY;
/*
* Severe all ways to obtain new pointers to @pg.
*/
cl_page_owner_clear(pg);
+
+ /*
+ * unexport the page firstly before freeing it so that
+ * the page content is considered to be invalid.
+ * We have to do this because a CPS_FREEING cl_page may
+ * be NOT under the protection of a cl_lock.
+ * Afterwards, if this page is found by other threads, then this
+ * page will be forced to reread.
+ */
+ 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 (!radix)
- /*
- * !radix means that @pg is not yet in the radix tree, skip
- * removing it.
- */
- pg = pg->cp_child;
- for (; pg != NULL; pg = pg->cp_child) {
- void *value;
- struct cl_object_header *hdr;
-
- hdr = cl_object_header(pg->cp_obj);
- spin_lock(&hdr->coh_page_guard);
- value = radix_tree_delete(&hdr->coh_tree, pg->cp_index);
- PASSERT(env, pg, value == pg);
- PASSERT(env, pg, hdr->coh_pages > 0);
- hdr->coh_pages--;
- spin_unlock(&hdr->coh_page_guard);
+
+ if (tmp->cp_type == CPT_CACHEABLE) {
+ if (!radix)
+ /* !radix means that @pg is not yet in the radix tree,
+ * skip removing it.
+ */
+ tmp = pg->cp_child;
+ for (; tmp != NULL; tmp = tmp->cp_child) {
+ void *value;
+ struct cl_object_header *hdr;
+
+ hdr = cl_object_header(tmp->cp_obj);
+ 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);
+ }
}
+
EXIT;
}
* Marks page up-to-date.
*
* Call cl_page_operations::cpo_export() through all layers top-to-bottom. The
- * layer responsible for VM interaction has to mark page as up-to-date. From
- * this moment on, page can be shown to the user space without Lustre being
- * notified, hence the name.
+ * layer responsible for VM interaction has to mark/clear page as up-to-date
+ * by the \a uptodate argument.
*
* \see cl_page_operations::cpo_export()
*/
-void cl_page_export(const struct lu_env *env, struct cl_page *pg)
+void cl_page_export(const struct lu_env *env, struct cl_page *pg, int uptodate)
{
PINVRNT(env, pg, cl_page_invariant(pg));
CL_PAGE_INVOID(env, pg, CL_PAGE_OP(cpo_export),
- (const struct lu_env *, const struct cl_page_slice *));
+ (const struct lu_env *,
+ const struct cl_page_slice *, int), uptodate);
}
EXPORT_SYMBOL(cl_page_export);
KLASSERT(ergo(crt == CRT_WRITE && pg->cp_type == CPT_CACHEABLE,
equi(result == 0,
PageWriteback(cl_page_vmpage(env, pg)))));
- CL_PAGE_HEADER(D_TRACE, env, pg, "%i %i\n", crt, result);
+ CL_PAGE_HEADER(D_TRACE, env, pg, "%d %d\n", crt, result);
return result;
}
EXPORT_SYMBOL(cl_page_prep);
void cl_page_completion(const struct lu_env *env,
struct cl_page *pg, enum cl_req_type crt, int ioret)
{
+ struct cl_sync_io *anchor = pg->cp_sync_io;
+
PASSERT(env, pg, crt < CRT_NR);
/* cl_page::cp_req already cleared by the caller (osc_completion()) */
PASSERT(env, pg, pg->cp_req == NULL);
PASSERT(env, pg, pg->cp_state == cl_req_type_state(crt));
- PINVRNT(env, pg, cl_page_invariant(pg));
ENTRY;
- CL_PAGE_HEADER(D_TRACE, env, pg, "%i %i\n", crt, ioret);
+ CL_PAGE_HEADER(D_TRACE, env, pg, "%d %d\n", crt, ioret);
if (crt == CRT_READ && ioret == 0) {
PASSERT(env, pg, !(pg->cp_flags & CPF_READ_COMPLETED));
pg->cp_flags |= CPF_READ_COMPLETED;
CL_PAGE_INVOID_REVERSE(env, pg, CL_PAGE_OP(io[crt].cpo_completion),
(const struct lu_env *,
const struct cl_page_slice *, int), ioret);
+ if (anchor) {
+ 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);
PASSERT(env, pg, pg->cp_state == CPS_CACHED);
cl_page_io_start(env, pg, crt);
}
- CL_PAGE_HEADER(D_TRACE, env, pg, "%i %i\n", crt, result);
+ CL_PAGE_HEADER(D_TRACE, env, pg, "%d %d\n", crt, result);
RETURN(result);
}
EXPORT_SYMBOL(cl_page_make_ready);
* 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, "%i %i\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.
*
}
EXPORT_SYMBOL(cl_page_is_under_lock);
+static int page_prune_cb(const struct lu_env *env, struct cl_io *io,
+ struct cl_page *page, void *cbdata)
+{
+ cl_page_own(env, io, page);
+ cl_page_unmap(env, io, page);
+ cl_page_discard(env, io, page);
+ cl_page_disown(env, io, page);
+ return CLP_GANG_OKAY;
+}
+
/**
* Purges all cached pages belonging to the object \a obj.
*/
struct cl_thread_info *info;
struct cl_object *obj = cl_object_top(clobj);
struct cl_io *io;
- struct cl_page_list *plist;
int result;
ENTRY;
info = cl_env_info(env);
- plist = &info->clt_list;
io = &info->clt_io;
/*
* 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);
RETURN(io->ci_result);
}
- cl_page_list_init(plist);
- cl_page_gang_lookup(env, obj, io, 0, CL_PAGE_EOF, plist);
- /*
- * Since we're purging the pages of an object, we don't care
- * the possible outcomes of the following functions.
- */
- cl_page_list_unmap(env, io, plist);
- cl_page_list_discard(env, io, plist);
- cl_page_list_disown(env, io, plist);
- cl_page_list_fini(env, plist);
+ do {
+ result = cl_page_gang_lookup(env, obj, io, 0, CL_PAGE_EOF,
+ page_prune_cb, NULL);
+ if (result == CLP_GANG_RESCHED)
+ cfs_cond_resched();
+ } while (result != CLP_GANG_OKAY);
cl_io_fini(env, io);
RETURN(result);
{
PINVRNT(env, pg, cl_page_invariant(pg));
- CL_PAGE_HEADER(D_TRACE, env, pg, "%i %i\n", from, to);
+ CL_PAGE_HEADER(D_TRACE, env, pg, "%d %d\n", from, to);
CL_PAGE_INVOID(env, pg, CL_PAGE_OP(cpo_clip),
(const struct lu_env *,
const struct cl_page_slice *,int, int),
{
(*printer)(env, cookie,
"page@%p[%d %p:%lu ^%p_%p %d %d %d %p %p %#x]\n",
- pg, atomic_read(&pg->cp_ref), pg->cp_obj,
+ pg, cfs_atomic_read(&pg->cp_ref), pg->cp_obj,
pg->cp_index, pg->cp_parent, pg->cp_child,
pg->cp_state, pg->cp_error, pg->cp_type,
pg->cp_owner, pg->cp_req, pg->cp_flags);
const struct cl_page_operations *ops)
{
ENTRY;
- list_add_tail(&slice->cpl_linkage, &page->cp_layers);
+ cfs_list_add_tail(&slice->cpl_linkage, &page->cp_layers);
slice->cpl_obj = obj;
slice->cpl_ops = ops;
slice->cpl_page = page;
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