-/* -*- 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, 2013, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Client Lustre Page.
*
* Author: Nikita Danilov <nikita.danilov@sun.com>
+ * Author: Jinshan Xiong <jinshan.xiong@intel.com>
*/
#define DEBUG_SUBSYSTEM S_CLASS
-#ifndef EXPORT_SYMTAB
-# define EXPORT_SYMTAB
-#endif
#include <libcfs/libcfs.h>
#include <obd_class.h>
#include <cl_object.h>
#include "cl_internal.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
- }
-};
+static void cl_page_delete0(const struct lu_env *env, struct cl_page *pg);
#ifdef LIBCFS_DEBUG
# define PASSERT(env, page, expr) \
((void)sizeof(env), (void)sizeof(page), (void)sizeof !!(exp))
#endif /* !LIBCFS_DEBUG */
-#ifdef INVARIANT_CHECK
+#ifdef CONFIG_LUSTRE_DEBUG_EXPENSIVE_CHECK
# define PINVRNT(env, page, expr) \
do { \
if (unlikely(!(expr))) { \
LINVRNT(0); \
} \
} while (0)
-#else /* !INVARIANT_CHECK */
+#else /* !CONFIG_LUSTRE_DEBUG_EXPENSIVE_CHECK */
# define PINVRNT(env, page, exp) \
- ((void)sizeof(env), (void)sizeof(page), (void)sizeof !!(exp))
-#endif /* !INVARIANT_CHECK */
-
-/**
- * Internal version of cl_page_top, it should be called with page referenced,
- * or coh_page_guard held.
- */
-static struct cl_page *cl_page_top_trusted(struct cl_page *page)
-{
- while (page->cp_parent != NULL)
- page = page->cp_parent;
- return page;
-}
+ ((void)sizeof(env), (void)sizeof(page), (void)sizeof !!(exp))
+#endif /* !CONFIG_LUSTRE_DEBUG_EXPENSIVE_CHECK */
+
+/* Disable page statistic by default due to huge performance penalty. */
+#ifdef CONFIG_DEBUG_PAGESTATE_TRACKING
+#define CS_PAGE_INC(o, item) \
+ atomic_inc(&cl_object_site(o)->cs_pages.cs_stats[CS_##item])
+#define CS_PAGE_DEC(o, item) \
+ atomic_dec(&cl_object_site(o)->cs_pages.cs_stats[CS_##item])
+#define CS_PAGESTATE_INC(o, state) \
+ atomic_inc(&cl_object_site(o)->cs_pages_state[state])
+#define CS_PAGESTATE_DEC(o, state) \
+ 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_get().
*
* This function can be used to obtain initial reference to previously
* unreferenced cached object. It can be called only if concurrent page
- * reclamation is somehow prevented, e.g., by locking page radix-tree
- * (cl_object_header::hdr->coh_page_guard), or by keeping a lock on a VM page,
+ * reclamation is somehow prevented, e.g., by keeping a lock on a VM page,
* associated with \a page.
*
* Use with care! Not exported.
*/
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(atomic_read(&page->cp_ref) > 0);
+ atomic_inc(&page->cp_ref);
}
/**
cl_page_at_trusted(const struct cl_page *page,
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);
- do {
- cfs_list_for_each_entry(slice, &page->cp_layers, cpl_linkage) {
- if (slice->cpl_obj->co_lu.lo_dev->ld_type == dtype)
- RETURN(slice);
- }
- page = page->cp_child;
- } while (page != NULL);
- RETURN(NULL);
+ const struct cl_page_slice *slice;
+ ENTRY;
+
+ list_for_each_entry(slice, &page->cp_layers, cpl_linkage) {
+ if (slice->cpl_obj->co_lu.lo_dev->ld_type == dtype)
+ RETURN(slice);
+ }
+ RETURN(NULL);
}
-/**
- * Returns a page with given index in the given object, or NULL if no page is
- * found. Acquires a reference on \a page.
- *
- * Locking: called under cl_object_header::coh_page_guard spin-lock.
- */
-struct cl_page *cl_page_lookup(struct cl_object_header *hdr, pgoff_t index)
-{
- struct cl_page *page;
-
- LASSERT_SPIN_LOCKED(&hdr->coh_page_guard);
-
- page = radix_tree_lookup(&hdr->coh_tree, index);
- 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 \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.
- */
-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 nonblock,
- int *resched)
-{
- struct cl_object_header *hdr;
- struct cl_page *page;
- struct cl_page **pvec;
- const struct cl_page_slice *slice;
- const struct lu_device_type *dtype;
- pgoff_t idx;
- unsigned int nr;
- unsigned int i;
- unsigned int j;
- int (*page_own)(const struct lu_env *env,
- struct cl_io *io,
- struct cl_page *pg);
- ENTRY;
-
- if (resched != NULL)
- *resched = 0;
- page_own = nonblock ? cl_page_own_try : cl_page_own;
-
- 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;
- cfs_spin_lock(&hdr->coh_page_guard);
- while ((nr = radix_tree_gang_lookup(&hdr->coh_tree, (void **)pvec,
- idx, CLT_PVEC_SIZE)) > 0) {
- idx = pvec[nr - 1]->cp_index + 1;
- for (i = 0, j = 0; i < nr; ++i) {
- page = pvec[i];
- pvec[i] = NULL;
- if (page->cp_index > end)
- 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);
- /*
- * Pages for lsm-less file has no underneath sub-page
- * for osc, in case of ...
- */
- PASSERT(env, page, slice != NULL);
-
- page = slice->cpl_page;
- /*
- * Can safely call cl_page_get_trust() under
- * radix-tree spin-lock.
- *
- * XXX not true, because @page is from object another
- * than @hdr and protected by different tree lock.
- */
- cl_page_get_trust(page);
- lu_ref_add_atomic(&page->cp_reference,
- "page_list", cfs_current());
- pvec[j++] = page;
- }
-
- /*
- * Here a delicate locking dance is performed. Current thread
- * holds a reference to a page, but has to own it before it
- * can be placed into queue. Owning implies waiting, so
- * radix-tree lock is to be released. After a wait one has to
- * check that pages weren't truncated (cl_page_own() returns
- * error in the latter case).
- */
- cfs_spin_unlock(&hdr->coh_page_guard);
- for (i = 0; i < j; ++i) {
- page = pvec[i];
- if (page_own(env, io, page) == 0)
- cl_page_list_add(queue, page);
- lu_ref_del(&page->cp_reference,
- "page_list", cfs_current());
- cl_page_put(env, page);
- }
- cfs_spin_lock(&hdr->coh_page_guard);
- if (nr < CLT_PVEC_SIZE)
- break;
- if (resched != NULL && cfs_need_resched()) {
- *resched = 1;
- break;
- }
- }
- cfs_spin_unlock(&hdr->coh_page_guard);
- EXIT;
-}
-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);
-
- 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;
- cfs_might_sleep();
- while (!cfs_list_empty(&page->cp_layers)) {
- struct cl_page_slice *slice;
-
- 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);
- }
- cfs_atomic_dec(&site->cs_pages.cs_total);
-
-#ifdef LUSTRE_PAGESTATE_TRACKING
- cfs_atomic_dec(&site->cs_pages_state[page->cp_state]);
-#endif
- 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);
- EXIT;
+ struct cl_object *obj = page->cp_obj;
+ int pagesize = cl_object_header(obj)->coh_page_bufsize;
+
+ PASSERT(env, page, list_empty(&page->cp_batch));
+ PASSERT(env, page, page->cp_owner == NULL);
+ PASSERT(env, page, page->cp_req == NULL);
+ PASSERT(env, page, page->cp_state == CPS_FREEING);
+
+ ENTRY;
+ while (!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);
+ if (unlikely(slice->cpl_ops->cpo_fini != NULL))
+ slice->cpl_ops->cpo_fini(env, slice);
+ }
+ 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_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)
+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_state_set_trust(page,
- CPS_FREEING);
- 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,
+ GFP_NOFS);
+ if (page != NULL) {
+ int result = 0;
+ atomic_set(&page->cp_ref, 1);
+ page->cp_obj = o;
+ cl_object_get(o);
+ lu_object_ref_add_at(&o->co_lu, &page->cp_obj_ref, "cl_page",
+ page);
+ page->cp_vmpage = vmpage;
+ cl_page_state_set_trust(page, CPS_CACHED);
+ page->cp_type = type;
+ INIT_LIST_HEAD(&page->cp_layers);
+ INIT_LIST_HEAD(&page->cp_batch);
+ INIT_LIST_HEAD(&page->cp_flight);
+ 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) {
+ result = o->co_ops->coo_page_init(env, o, page,
+ ind);
+ if (result != 0) {
+ cl_page_delete0(env, page);
+ 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);
}
+EXPORT_SYMBOL(cl_page_alloc);
/**
* Returns a cl_page with index \a idx at the object \a o, and associated with
*
* \see cl_object_find(), cl_lock_find()
*/
-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 *cl_page_find(const struct lu_env *env,
+ struct cl_object *o,
+ pgoff_t idx, struct page *vmpage,
+ enum cl_page_type type)
{
- struct cl_page *page;
- struct cl_page *ghost = NULL;
- struct cl_object_header *hdr;
- struct cl_site *site = cl_object_site(o);
- int err;
+ struct cl_page *page = NULL;
+ struct cl_object_header *hdr;
- LINVRNT(type == CPT_CACHEABLE || type == CPT_TRANSIENT);
- cfs_might_sleep();
+ LASSERT(type == CPT_CACHEABLE || type == CPT_TRANSIENT);
+ might_sleep();
- ENTRY;
+ ENTRY;
- hdr = cl_object_header(o);
- cfs_atomic_inc(&site->cs_pages.cs_lookup);
+ hdr = cl_object_header(o);
+ 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
*
* reference on it.
*/
page = cl_vmpage_page(vmpage, o);
- PINVRNT(env, page,
- ergo(page != NULL,
- cl_page_vmpage(env, page) == vmpage &&
- (void *)radix_tree_lookup(&hdr->coh_tree,
- idx) == page));
- } else {
- cfs_spin_lock(&hdr->coh_page_guard);
- page = cl_page_lookup(hdr, idx);
- cfs_spin_unlock(&hdr->coh_page_guard);
- }
- if (page != NULL) {
- cfs_atomic_inc(&site->cs_pages.cs_hit);
- RETURN(page);
+ if (page != NULL) {
+ 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)
- RETURN(page);
- /*
- * 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);
- err = radix_tree_insert(&hdr->coh_tree, idx, page);
- if (err != 0) {
- ghost = page;
- /*
- * Noted by Jay: a lock on \a vmpage protects cl_page_find()
- * from this race, but
- *
- * 0. it's better to have cl_page interface "locally
- * consistent" so that its correctness can be reasoned
- * about without appealing to the (obscure world of) VM
- * locking.
- *
- * 1. handling this race allows ->coh_tree to remain
- * consistent even when VM locking is somehow busted,
- * which is very useful during diagnosing and debugging.
- */
- page = ERR_PTR(err);
- 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.
- */
- cfs_spin_unlock(&hdr->coh_page_guard);
- cl_page_put(env, page);
- cfs_spin_lock(&hdr->coh_page_guard);
- page = ERR_PTR(-EBUSY);
- }
- }
- } else {
- if (parent) {
- LASSERT(page->cp_parent == NULL);
- page->cp_parent = parent;
- parent->cp_child = page;
- }
- hdr->coh_pages++;
- }
- cfs_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);
- }
- 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);
+ page = cl_page_alloc(env, o, idx, vmpage, type);
+ RETURN(page);
}
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 *parent;
- struct cl_page *child;
- struct cl_io *owner;
+ /*
+ * Page invariant is protected by a VM lock.
+ */
+ LINVRNT(cl_page_is_vmlocked(NULL, pg));
- /*
- * Page invariant is protected by a VM lock.
- */
- LINVRNT(cl_page_is_vmlocked(NULL, pg));
-
- header = cl_object_header(pg->cp_obj);
- parent = pg->cp_parent;
- child = pg->cp_child;
- owner = pg->cp_owner;
-
- return cfs_atomic_read(&pg->cp_ref) > 0 &&
- ergo(parent != NULL, parent->cp_child == pg) &&
- ergo(child != NULL, child->cp_parent == pg) &&
- ergo(child != NULL, pg->cp_obj != child->cp_obj) &&
- ergo(parent != NULL, pg->cp_obj != parent->cp_obj) &&
- ergo(owner != NULL && parent != NULL,
- parent->cp_owner == pg->cp_owner->ci_parent) &&
- ergo(owner != NULL && child != NULL,
- child->cp_owner->ci_parent == owner) &&
- /*
- * 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,
- (void *)radix_tree_lookup(&header->coh_tree,
- pg->cp_index) == pg ||
- (child == NULL && parent == NULL));
+ return cl_page_in_use_noref(pg);
}
static void cl_page_state_set0(const struct lu_env *env,
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
old = page->cp_state;
PASSERT(env, page, allowed_transitions[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));
-
-#ifdef LUSTRE_PAGESTATE_TRACKING
- cfs_atomic_dec(&site->cs_pages_state[page->cp_state]);
- cfs_atomic_inc(&site->cs_pages_state[state]);
-#endif
- cl_page_state_set_trust(page, state);
- }
- EXIT;
+ PASSERT(env, page, page->cp_state == old);
+ PASSERT(env, page, equi(state == CPS_OWNED, page->cp_owner != NULL));
+
+ 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, 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);
-
- EXIT;
- return;
- }
- cfs_spin_unlock(&hdr->coh_page_guard);
- }
-
- EXIT;
+ atomic_read(&page->cp_ref));
+
+ if (atomic_dec_and_test(&page->cp_ref)) {
+ LASSERT(page->cp_state == CPS_FREEING);
+
+ LASSERT(atomic_read(&page->cp_ref) == 0);
+ 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;
}
EXPORT_SYMBOL(cl_page_put);
/**
- * Returns a VM page associated with a given cl_page.
- */
-cfs_page_t *cl_page_vmpage(const struct lu_env *env, struct cl_page *page)
-{
- const struct cl_page_slice *slice;
-
- /*
- * Find uppermost layer with ->cpo_vmpage() method, and return its
- * result.
- */
- page = cl_page_top(page);
- do {
- 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));
- }
- page = page->cp_child;
- } while (page != NULL);
- LBUG(); /* ->cpo_vmpage() has to be defined somewhere in the stack */
-}
-EXPORT_SYMBOL(cl_page_vmpage);
-
-/**
* Returns a cl_page associated with a VM page, and given cl_object.
*/
-struct cl_page *cl_vmpage_page(cfs_page_t *vmpage, struct cl_object *obj)
+struct cl_page *cl_vmpage_page(struct page *vmpage, struct cl_object *obj)
{
- struct cl_page *page;
- struct cl_object_header *hdr;
-
- ENTRY;
- KLASSERT(PageLocked(vmpage));
-
- /*
- * NOTE: absence of races and liveness of data are guaranteed by page
- * lock on a "vmpage". That works because object destruction has
- * bottom-to-top pass.
- */
-
- /*
- * 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);
+ struct cl_page *page;
+
+ ENTRY;
+ KLASSERT(PageLocked(vmpage));
+
+ /*
+ * NOTE: absence of races and liveness of data are guaranteed by page
+ * lock on a "vmpage". That works because object destruction has
+ * bottom-to-top pass.
+ */
+
+ page = (struct cl_page *)vmpage->private;
+ if (page != NULL) {
+ cl_page_get_trust(page);
+ LASSERT(page->cp_type == CPT_CACHEABLE);
+ }
+ RETURN(page);
}
EXPORT_SYMBOL(cl_vmpage_page);
-/**
- * Returns the top-page for a given page.
- *
- * \see cl_object_top(), cl_io_top()
- */
-struct cl_page *cl_page_top(struct cl_page *page)
-{
- return cl_page_top_trusted(page);
-}
-EXPORT_SYMBOL(cl_page_top);
-
const struct cl_page_slice *cl_page_at(const struct cl_page *page,
const struct lu_device_type *dtype)
{
#define CL_PAGE_OP(opname) offsetof(struct cl_page_operations, opname)
-#define CL_PAGE_INVOKE(_env, _page, _op, _proto, ...) \
-({ \
- const struct lu_env *__env = (_env); \
- struct cl_page *__page = (_page); \
- const struct cl_page_slice *__scan; \
- int __result; \
- ptrdiff_t __op = (_op); \
- int (*__method)_proto; \
- \
- __result = 0; \
- __page = cl_page_top(__page); \
- do { \
- cfs_list_for_each_entry(__scan, &__page->cp_layers, \
- cpl_linkage) { \
- __method = *(void **)((char *)__scan->cpl_ops + \
- __op); \
- if (__method != NULL) { \
- __result = (*__method)(__env, __scan, \
- ## __VA_ARGS__); \
- if (__result != 0) \
- break; \
- } \
- } \
- __page = __page->cp_child; \
- } while (__page != NULL && __result == 0); \
- if (__result > 0) \
- __result = 0; \
- __result; \
+#define CL_PAGE_INVOKE(_env, _page, _op, _proto, ...) \
+({ \
+ const struct lu_env *__env = (_env); \
+ struct cl_page *__page = (_page); \
+ const struct cl_page_slice *__scan; \
+ int __result; \
+ ptrdiff_t __op = (_op); \
+ int (*__method)_proto; \
+ \
+ __result = 0; \
+ list_for_each_entry(__scan, &__page->cp_layers, cpl_linkage) { \
+ __method = *(void **)((char *)__scan->cpl_ops + __op); \
+ if (__method != NULL) { \
+ __result = (*__method)(__env, __scan, ## __VA_ARGS__); \
+ if (__result != 0) \
+ break; \
+ } \
+ } \
+ if (__result > 0) \
+ __result = 0; \
+ __result; \
})
-#define CL_PAGE_INVOID(_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; \
- \
- __page = cl_page_top(__page); \
- do { \
- cfs_list_for_each_entry(__scan, &__page->cp_layers, \
- cpl_linkage) { \
- __method = *(void **)((char *)__scan->cpl_ops + \
- __op); \
- if (__method != NULL) \
- (*__method)(__env, __scan, \
- ## __VA_ARGS__); \
- } \
- __page = __page->cp_child; \
- } while (__page != NULL); \
+#define CL_PAGE_INVOKE_REVERSE(_env, _page, _op, _proto, ...) \
+({ \
+ const struct lu_env *__env = (_env); \
+ struct cl_page *__page = (_page); \
+ const struct cl_page_slice *__scan; \
+ int __result; \
+ ptrdiff_t __op = (_op); \
+ int (*__method)_proto; \
+ \
+ __result = 0; \
+ list_for_each_entry_reverse(__scan, &__page->cp_layers, \
+ cpl_linkage) { \
+ __method = *(void **)((char *)__scan->cpl_ops + __op); \
+ if (__method != NULL) { \
+ __result = (*__method)(__env, __scan, ## __VA_ARGS__); \
+ if (__result != 0) \
+ break; \
+ } \
+ } \
+ if (__result > 0) \
+ __result = 0; \
+ __result; \
+})
+
+#define CL_PAGE_INVOID(_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; \
+ \
+ list_for_each_entry(__scan, &__page->cp_layers, cpl_linkage) { \
+ __method = *(void **)((char *)__scan->cpl_ops + __op); \
+ if (__method != NULL) \
+ (*__method)(__env, __scan, ## __VA_ARGS__); \
+ } \
} 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 { \
- 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); \
+#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. */ \
+ 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__); \
+ } \
} while (0)
static int cl_page_invoke(const struct lu_env *env,
static void cl_page_owner_clear(struct cl_page *page)
{
- ENTRY;
- for (page = cl_page_top(page); page != NULL; page = page->cp_child) {
- if (page->cp_owner != NULL) {
- LASSERT(page->cp_owner->ci_owned_nr > 0);
- page->cp_owner->ci_owned_nr--;
- page->cp_owner = NULL;
- page->cp_task = NULL;
- }
- }
- EXIT;
+ ENTRY;
+ if (page->cp_owner != NULL) {
+ LASSERT(page->cp_owner->ci_owned_nr > 0);
+ page->cp_owner->ci_owned_nr--;
+ page->cp_owner = NULL;
+ }
+ EXIT;
}
static void cl_page_owner_set(struct cl_page *page)
{
- ENTRY;
- for (page = cl_page_top(page); page != NULL; page = page->cp_child) {
- LASSERT(page->cp_owner != NULL);
- page->cp_owner->ci_owned_nr++;
- }
- EXIT;
+ ENTRY;
+ LASSERT(page->cp_owner != NULL);
+ page->cp_owner->ci_owned_nr++;
+ EXIT;
}
void cl_page_disown0(const struct lu_env *env,
ENTRY;
state = pg->cp_state;
PINVRNT(env, pg, state == CPS_OWNED || state == CPS_FREEING);
- PINVRNT(env, pg, cl_page_invariant(pg));
+ PINVRNT(env, pg, cl_page_invariant(pg) || state == CPS_FREEING);
cl_page_owner_clear(pg);
if (state == CPS_OWNED)
*/
int cl_page_is_owned(const struct cl_page *pg, const struct cl_io *io)
{
- LINVRNT(cl_object_same(pg->cp_obj, io->ci_obj));
- ENTRY;
- RETURN(pg->cp_state == CPS_OWNED && pg->cp_owner == io);
+ struct cl_io *top = cl_io_top((struct cl_io *)io);
+ LINVRNT(cl_object_same(pg->cp_obj, io->ci_obj));
+ ENTRY;
+ RETURN(pg->cp_state == CPS_OWNED && pg->cp_owner == top);
}
EXPORT_SYMBOL(cl_page_is_owned);
PINVRNT(env, pg, !cl_page_is_owned(pg, io));
ENTRY;
- pg = cl_page_top(pg);
io = cl_io_top(io);
if (pg->cp_state == CPS_FREEING) {
- result = -EAGAIN;
+ result = -ENOENT;
} else {
result = CL_PAGE_INVOKE(env, pg, CL_PAGE_OP(cpo_own),
(const struct lu_env *,
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;
+ pg->cp_owner = cl_io_top(io);;
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 = -EAGAIN;
+ result = -ENOENT;
}
}
}
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));
+ PINVRNT(env, pg, cl_object_same(pg->cp_obj, io->ci_obj));
- ENTRY;
- pg = cl_page_top(pg);
- io = cl_io_top(io);
+ ENTRY;
+ io = cl_io_top(io);
- cl_page_invoid(env, io, pg, CL_PAGE_OP(cpo_assume));
- pg->cp_owner = io;
- pg->cp_task = current;
- cl_page_owner_set(pg);
- cl_page_state_set(env, pg, CPS_OWNED);
- EXIT;
+ cl_page_invoid(env, io, pg, CL_PAGE_OP(cpo_assume));
+ PASSERT(env, pg, pg->cp_owner == NULL);
+ pg->cp_owner = cl_io_top(io);
+ cl_page_owner_set(pg);
+ cl_page_state_set(env, pg, CPS_OWNED);
+ EXIT;
}
EXPORT_SYMBOL(cl_page_assume);
PINVRNT(env, pg, cl_page_invariant(pg));
ENTRY;
- pg = cl_page_top(pg);
io = cl_io_top(io);
cl_page_owner_clear(pg);
cl_page_state_set(env, pg, CPS_CACHED);
void cl_page_disown(const struct lu_env *env,
struct cl_io *io, struct cl_page *pg)
{
- PINVRNT(env, pg, cl_page_is_owned(pg, io));
+ PINVRNT(env, pg, cl_page_is_owned(pg, io) ||
+ pg->cp_state == CPS_FREEING);
- ENTRY;
- pg = cl_page_top(pg);
- io = cl_io_top(io);
- cl_page_disown0(env, io, pg);
- EXIT;
+ ENTRY;
+ io = cl_io_top(io);
+ cl_page_disown0(env, io, pg);
+ EXIT;
}
EXPORT_SYMBOL(cl_page_disown);
void cl_page_discard(const struct lu_env *env,
struct cl_io *io, struct cl_page *pg)
{
- PINVRNT(env, pg, cl_page_is_owned(pg, io));
- PINVRNT(env, pg, cl_page_invariant(pg));
+ PINVRNT(env, pg, cl_page_is_owned(pg, io));
+ PINVRNT(env, pg, cl_page_invariant(pg));
- cl_page_invoid(env, io, pg, CL_PAGE_OP(cpo_discard));
+ cl_page_invoid(env, io, pg, CL_PAGE_OP(cpo_discard));
}
EXPORT_SYMBOL(cl_page_discard);
* pages, e.g,. in a error handling cl_page_find()->cl_page_delete0()
* path. Doesn't check page invariant.
*/
-static void cl_page_delete0(const struct lu_env *env, struct cl_page *pg,
- int radix)
+static void cl_page_delete0(const struct lu_env *env, struct cl_page *pg)
{
- struct cl_page *tmp = pg;
ENTRY;
- PASSERT(env, pg, pg == cl_page_top(pg));
PASSERT(env, pg, pg->cp_state != CPS_FREEING);
/*
*/
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);
- 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);
- 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);
- }
-
- CL_PAGE_INVOID(env, pg, CL_PAGE_OP(cpo_delete),
+ CL_PAGE_INVOID_REVERSE(env, pg, CL_PAGE_OP(cpo_delete),
(const struct lu_env *, const struct cl_page_slice *));
+
EXIT;
}
* Once page reaches cl_page_state::CPS_FREEING, all remaining references will
* drain after some time, at which point page will be recycled.
*
- * \pre pg == cl_page_top(pg)
* \pre VM page is locked
* \post pg->cp_state == CPS_FREEING
*
*/
void cl_page_delete(const struct lu_env *env, struct cl_page *pg)
{
- PINVRNT(env, pg, cl_page_invariant(pg));
- ENTRY;
- cl_page_delete0(env, pg, 1);
- EXIT;
+ PINVRNT(env, pg, cl_page_invariant(pg));
+ ENTRY;
+ cl_page_delete0(env, pg);
+ EXIT;
}
EXPORT_SYMBOL(cl_page_delete);
/**
- * Unmaps page from user virtual memory.
- *
- * Calls cl_page_operations::cpo_unmap() through all layers top-to-bottom. The
- * layer responsible for VM interaction has to unmap page from user space
- * virtual memory.
- *
- * \see cl_page_operations::cpo_unmap()
- */
-int cl_page_unmap(const struct lu_env *env,
- struct cl_io *io, struct cl_page *pg)
-{
- PINVRNT(env, pg, cl_page_is_owned(pg, io));
- PINVRNT(env, pg, cl_page_invariant(pg));
-
- return cl_page_invoke(env, io, pg, CL_PAGE_OP(cpo_unmap));
-}
-EXPORT_SYMBOL(cl_page_unmap);
-
-/**
* Marks page up-to-date.
*
* Call cl_page_operations::cpo_export() through all layers top-to-bottom. The
const struct cl_page_slice *slice;
ENTRY;
- pg = cl_page_top_trusted((struct cl_page *)pg);
slice = container_of(pg->cp_layers.next,
const struct cl_page_slice, cpl_linkage);
PASSERT(env, pg, slice->cpl_ops->cpo_is_vmlocked != NULL);
* PG_writeback without risking other layers deciding to skip this
* page.
*/
- result = cl_page_invoke(env, io, pg, CL_PAGE_OP(io[crt].cpo_prep));
- if (result == 0)
- cl_page_io_start(env, pg, crt);
-
- 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, "%d %d\n", crt, result);
- return result;
+ if (crt >= CRT_NR)
+ return -EINVAL;
+ result = cl_page_invoke(env, io, pg, CL_PAGE_OP(io[crt].cpo_prep));
+ if (result == 0)
+ cl_page_io_start(env, pg, crt);
+
+ KLASSERT(ergo(crt == CRT_WRITE && pg->cp_type == CPT_CACHEABLE,
+ equi(result == 0,
+ PageWriteback(cl_page_vmpage(pg)))));
+ CL_PAGE_HEADER(D_TRACE, env, pg, "%d %d\n", crt, result);
+ return result;
}
EXPORT_SYMBOL(cl_page_prep);
/* 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, "%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_state_set(env, pg, CPS_CACHED);
+ if (crt >= CRT_NR)
+ return;
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);
PINVRNT(env, pg, crt < CRT_NR);
ENTRY;
+ if (crt >= CRT_NR)
+ RETURN(-EINVAL);
result = CL_PAGE_INVOKE(env, pg, CL_PAGE_OP(io[crt].cpo_make_ready),
(const struct lu_env *,
const struct cl_page_slice *));
EXPORT_SYMBOL(cl_page_make_ready);
/**
- * Notify layers that high level io decided to place this page into a cache
- * for future transfer.
- *
- * The layer implementing transfer engine (osc) has to register this page in
- * its queues.
+ * 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_PAGEIN || pg->cp_state == CPS_PAGEOUT)
+ * \post ergo(result == 0, pg->cp_state == CPS_PAGEOUT)
*
- * \see cl_page_operations::cpo_cache_add()
+ * \see cl_page_operations::cpo_flush()
*/
-int cl_page_cache_add(const struct lu_env *env, struct cl_io *io,
- struct cl_page *pg, enum cl_req_type crt)
+int cl_page_flush(const struct lu_env *env, struct cl_io *io,
+ struct cl_page *pg)
{
- int result;
+ int result;
- 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, 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;
+
+ 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_cache_add);
+EXPORT_SYMBOL(cl_page_flush);
/**
* Checks whether page is protected by any extent lock is at least required
* \see cl_page_operations::cpo_is_under_lock()
*/
int cl_page_is_under_lock(const struct lu_env *env, struct cl_io *io,
- struct cl_page *page)
+ struct cl_page *page, pgoff_t *max_index)
{
- int rc;
+ int rc;
- PINVRNT(env, page, cl_page_invariant(page));
+ PINVRNT(env, page, cl_page_invariant(page));
- ENTRY;
- rc = CL_PAGE_INVOKE(env, page, CL_PAGE_OP(cpo_is_under_lock),
- (const struct lu_env *,
- const struct cl_page_slice *, struct cl_io *),
- io);
- PASSERT(env, page, rc != 0);
- RETURN(rc);
+ ENTRY;
+ rc = CL_PAGE_INVOKE_REVERSE(env, page, CL_PAGE_OP(cpo_is_under_lock),
+ (const struct lu_env *,
+ const struct cl_page_slice *,
+ struct cl_io *, pgoff_t *),
+ io, max_index);
+ RETURN(rc);
}
EXPORT_SYMBOL(cl_page_is_under_lock);
/**
- * Purges all cached pages belonging to the object \a obj.
- */
-int cl_pages_prune(const struct lu_env *env, struct cl_object *clobj)
-{
- struct cl_thread_info *info;
- struct cl_object *obj = cl_object_top(clobj);
- struct cl_io *io;
- struct cl_page_list *plist;
- int resched;
- int result;
-
- ENTRY;
- info = cl_env_info(env);
- plist = &info->clt_list;
- io = &info->clt_io;
-
- /*
- * initialize the io. This is ugly since we never do IO in this
- * function, we just make cl_page_list functions happy. -jay
- */
- io->ci_obj = obj;
- result = cl_io_init(env, io, CIT_MISC, obj);
- if (result != 0) {
- cl_io_fini(env, io);
- RETURN(io->ci_result);
- }
-
- do {
- cl_page_list_init(plist);
- cl_page_gang_lookup(env, obj, io, 0, CL_PAGE_EOF, plist, 0,
- &resched);
- /*
- * 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);
-
- if (resched)
- cfs_cond_resched();
- } while (resched);
-
- cl_io_fini(env, io);
- RETURN(result);
-}
-EXPORT_SYMBOL(cl_pages_prune);
-
-/**
* Tells transfer engine that only part of a page is to be transmitted.
*
* \see cl_page_operations::cpo_clip()
void cl_page_header_print(const struct lu_env *env, void *cookie,
lu_printer_t printer, const struct cl_page *pg)
{
- (*printer)(env, cookie,
- "page@%p[%d %p:%lu ^%p_%p %d %d %d %p %p %#x]\n",
- 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);
+ (*printer)(env, cookie,
+ "page@%p[%d %p %d %d %d %p %p]\n",
+ pg, atomic_read(&pg->cp_ref), pg->cp_obj,
+ pg->cp_state, pg->cp_error, pg->cp_type,
+ pg->cp_owner, pg->cp_req);
}
EXPORT_SYMBOL(cl_page_header_print);
void cl_page_print(const struct lu_env *env, void *cookie,
lu_printer_t printer, const struct cl_page *pg)
{
- struct cl_page *scan;
-
- for (scan = cl_page_top((struct cl_page *)pg);
- scan != NULL; scan = scan->cp_child)
- cl_page_header_print(env, cookie, printer, scan);
- CL_PAGE_INVOKE(env, (struct cl_page *)pg, CL_PAGE_OP(cpo_print),
- (const struct lu_env *env,
- const struct cl_page_slice *slice,
- void *cookie, lu_printer_t p), cookie, printer);
- (*printer)(env, cookie, "end page@%p\n", pg);
+ cl_page_header_print(env, cookie, printer, pg);
+ CL_PAGE_INVOKE(env, (struct cl_page *)pg, CL_PAGE_OP(cpo_print),
+ (const struct lu_env *env,
+ const struct cl_page_slice *slice,
+ void *cookie, lu_printer_t p), cookie, printer);
+ (*printer)(env, cookie, "end page@%p\n", pg);
}
EXPORT_SYMBOL(cl_page_print);
*/
loff_t cl_offset(const struct cl_object *obj, pgoff_t idx)
{
- /*
- * XXX for now.
- */
- return (loff_t)idx << CFS_PAGE_SHIFT;
+ return (loff_t)idx << PAGE_CACHE_SHIFT;
}
EXPORT_SYMBOL(cl_offset);
*/
pgoff_t cl_index(const struct cl_object *obj, loff_t offset)
{
- /*
- * XXX for now.
- */
- return offset >> CFS_PAGE_SHIFT;
+ return offset >> PAGE_CACHE_SHIFT;
}
EXPORT_SYMBOL(cl_index);
int cl_page_size(const struct cl_object *obj)
{
- return 1 << CFS_PAGE_SHIFT;
+ return 1 << PAGE_CACHE_SHIFT;
}
EXPORT_SYMBOL(cl_page_size);
* \see cl_lock_slice_add(), cl_req_slice_add(), cl_io_slice_add()
*/
void cl_page_slice_add(struct cl_page *page, struct cl_page_slice *slice,
- struct cl_object *obj,
- const struct cl_page_operations *ops)
+ struct cl_object *obj, pgoff_t index,
+ const struct cl_page_operations *ops)
{
- ENTRY;
- cfs_list_add_tail(&slice->cpl_linkage, &page->cp_layers);
- slice->cpl_obj = obj;
- slice->cpl_ops = ops;
- slice->cpl_page = page;
- EXIT;
+ ENTRY;
+ list_add_tail(&slice->cpl_linkage, &page->cp_layers);
+ slice->cpl_obj = obj;
+ slice->cpl_index = index;
+ slice->cpl_ops = ops;
+ slice->cpl_page = page;
+ EXIT;
}
EXPORT_SYMBOL(cl_page_slice_add);
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