*/
/*
* This file is part of Lustre, http://www.lustre.org/
- * Lustre is a trademark of Sun Microsystems, Inc.
*
* Client Lustre Page.
*
cs_pagestate_dec(obj, cl_page->cp_state);
lu_object_ref_del_at(&obj->co_lu, &cl_page->cp_obj_ref,
"cl_page", cl_page);
- cl_object_put(env, obj);
+ if (cl_page->cp_type != CPT_TRANSIENT)
+ cl_object_put(env, obj);
lu_ref_fini(&cl_page->cp_reference);
__cl_page_free(cl_page, bufsize);
EXIT;
}
-/**
- * Helper function updating page state. This is the only place in the code
- * where cl_page::cp_state field is mutated.
- */
-static inline void cl_page_state_set_trust(struct cl_page *page,
- enum cl_page_state state)
-{
- /* bypass const. */
- *(enum cl_page_state *)&page->cp_state = state;
-}
-
static struct cl_page *__cl_page_alloc(struct cl_object *o)
{
int i = 0;
struct cl_page *cl_page = NULL;
unsigned short bufsize = cl_object_header(o)->coh_page_bufsize;
+ if (OBD_FAIL_CHECK(OBD_FAIL_LLITE_PAGE_ALLOC))
+ return NULL;
+
check:
/* the number of entries in cl_page_kmem_array is expected to
* only be 2-3 entries, so the lookup overhead should be low.
return cl_page;
}
-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 *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 lu_object_header *head;
+ struct cl_page *cl_page;
+ struct cl_object *head;
ENTRY;
- page = __cl_page_alloc(o);
- if (page != NULL) {
+ cl_page = __cl_page_alloc(o);
+ if (cl_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_batch);
- lu_ref_init(&page->cp_reference);
- head = o->co_lu.lo_header;
- list_for_each_entry(o, &head->loh_layers,
- co_lu.lo_linkage) {
+
+ /*
+ * Please fix cl_page:cp_state/type declaration if
+ * these assertions fail in the future.
+ */
+ BUILD_BUG_ON((1 << CP_STATE_BITS) < CPS_NR); /* cp_state */
+ BUILD_BUG_ON((1 << CP_TYPE_BITS) < CPT_NR); /* cp_type */
+ atomic_set(&cl_page->cp_ref, 1);
+ cl_page->cp_obj = o;
+ if (type != CPT_TRANSIENT)
+ cl_object_get(o);
+ lu_object_ref_add_at(&o->co_lu, &cl_page->cp_obj_ref,
+ "cl_page", cl_page);
+ cl_page->cp_vmpage = vmpage;
+ cl_page->cp_state = CPS_CACHED;
+ cl_page->cp_type = type;
+ cl_page->cp_inode = NULL;
+ INIT_LIST_HEAD(&cl_page->cp_batch);
+ lu_ref_init(&cl_page->cp_reference);
+ head = o;
+ cl_object_for_each(o, head) {
if (o->co_ops->coo_page_init != NULL) {
- result = o->co_ops->coo_page_init(env, o, page,
- ind);
+ result = o->co_ops->coo_page_init(env, o,
+ cl_page, ind);
if (result != 0) {
- cl_page_delete0(env, page);
- cl_page_free(env, page, NULL);
- page = ERR_PTR(result);
+ cl_page_delete0(env, cl_page);
+ cl_page_free(env, cl_page, NULL);
+ cl_page = ERR_PTR(result);
break;
}
}
cs_pagestate_dec(o, CPS_CACHED);
}
} else {
- page = ERR_PTR(-ENOMEM);
+ cl_page = ERR_PTR(-ENOMEM);
}
- RETURN(page);
+ RETURN(cl_page);
}
/**
if (type == CPT_CACHEABLE) {
/* vmpage lock is used to protect the child/parent
* relationship */
- KLASSERT(PageLocked(vmpage));
+ LASSERT(PageLocked(vmpage));
/*
* cl_vmpage_page() can be called here without any locks as
*
}
static void cl_page_state_set0(const struct lu_env *env,
- struct cl_page *page, enum cl_page_state state)
+ struct cl_page *cl_page,
+ enum cl_page_state state)
{
- enum cl_page_state old;
+ enum cl_page_state old;
- /*
- * Matrix of allowed state transitions [old][new], for sanity
- * checking.
- */
- static const int allowed_transitions[CPS_NR][CPS_NR] = {
- [CPS_CACHED] = {
- [CPS_CACHED] = 0,
- [CPS_OWNED] = 1, /* io finds existing cached page */
- [CPS_PAGEIN] = 0,
- [CPS_PAGEOUT] = 1, /* write-out from the cache */
- [CPS_FREEING] = 1, /* eviction on the memory pressure */
- },
- [CPS_OWNED] = {
- [CPS_CACHED] = 1, /* release to the cache */
- [CPS_OWNED] = 0,
- [CPS_PAGEIN] = 1, /* start read immediately */
- [CPS_PAGEOUT] = 1, /* start write immediately */
- [CPS_FREEING] = 1, /* lock invalidation or truncate */
- },
- [CPS_PAGEIN] = {
- [CPS_CACHED] = 1, /* io completion */
- [CPS_OWNED] = 0,
- [CPS_PAGEIN] = 0,
- [CPS_PAGEOUT] = 0,
- [CPS_FREEING] = 0,
- },
- [CPS_PAGEOUT] = {
- [CPS_CACHED] = 1, /* io completion */
- [CPS_OWNED] = 0,
- [CPS_PAGEIN] = 0,
- [CPS_PAGEOUT] = 0,
- [CPS_FREEING] = 0,
- },
- [CPS_FREEING] = {
- [CPS_CACHED] = 0,
- [CPS_OWNED] = 0,
- [CPS_PAGEIN] = 0,
- [CPS_PAGEOUT] = 0,
- [CPS_FREEING] = 0,
- }
- };
+ /*
+ * Matrix of allowed state transitions [old][new], for sanity
+ * checking.
+ */
+ static const int allowed_transitions[CPS_NR][CPS_NR] = {
+ [CPS_CACHED] = {
+ [CPS_CACHED] = 0,
+ [CPS_OWNED] = 1, /* io finds existing cached page */
+ [CPS_PAGEIN] = 0,
+ [CPS_PAGEOUT] = 1, /* write-out from the cache */
+ [CPS_FREEING] = 1, /* eviction on the memory pressure */
+ },
+ [CPS_OWNED] = {
+ [CPS_CACHED] = 1, /* release to the cache */
+ [CPS_OWNED] = 0,
+ [CPS_PAGEIN] = 1, /* start read immediately */
+ [CPS_PAGEOUT] = 1, /* start write immediately */
+ [CPS_FREEING] = 1, /* lock invalidation or truncate */
+ },
+ [CPS_PAGEIN] = {
+ [CPS_CACHED] = 1, /* io completion */
+ [CPS_OWNED] = 0,
+ [CPS_PAGEIN] = 0,
+ [CPS_PAGEOUT] = 0,
+ [CPS_FREEING] = 0,
+ },
+ [CPS_PAGEOUT] = {
+ [CPS_CACHED] = 1, /* io completion */
+ [CPS_OWNED] = 0,
+ [CPS_PAGEIN] = 0,
+ [CPS_PAGEOUT] = 0,
+ [CPS_FREEING] = 0,
+ },
+ [CPS_FREEING] = {
+ [CPS_CACHED] = 0,
+ [CPS_OWNED] = 0,
+ [CPS_PAGEIN] = 0,
+ [CPS_PAGEOUT] = 0,
+ [CPS_FREEING] = 0,
+ }
+ };
- ENTRY;
- old = page->cp_state;
- PASSERT(env, page, allowed_transitions[old][state]);
- CL_PAGE_HEADER(D_TRACE, env, page, "%d -> %d\n", old, state);
- 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);
+ ENTRY;
+ old = cl_page->cp_state;
+ PASSERT(env, cl_page, allowed_transitions[old][state]);
+ CL_PAGE_HEADER(D_TRACE, env, cl_page, "%d -> %d\n", old, state);
+ PASSERT(env, cl_page, cl_page->cp_state == old);
+ PASSERT(env, cl_page, equi(state == CPS_OWNED,
+ cl_page->cp_owner != NULL));
+
+ cs_pagestate_dec(cl_page->cp_obj, cl_page->cp_state);
+ cs_pagestate_inc(cl_page->cp_obj, state);
+ cl_page->cp_state = state;
EXIT;
}
struct cl_page *page;
ENTRY;
- KLASSERT(PageLocked(vmpage));
+ LASSERT(PageLocked(vmpage));
/*
* NOTE: absence of races and liveness of data are guaranteed by page
if (crt >= CRT_NR)
return -EINVAL;
- cl_page_slice_for_each(cl_page, slice, i) {
- if (slice->cpl_ops->cpo_own)
- result = (*slice->cpl_ops->io[crt].cpo_prep)(env,
+ if (cl_page->cp_type != CPT_TRANSIENT) {
+ cl_page_slice_for_each(cl_page, slice, i) {
+ if (slice->cpl_ops->cpo_own)
+ result =
+ (*slice->cpl_ops->io[crt].cpo_prep)(env,
slice,
io);
- if (result != 0)
- break;
+ if (result != 0)
+ break;
+ }
}
if (result >= 0) {
((char *)cl_page + sizeof(*cl_page));
ENTRY;
+ LASSERT(cl_page->cp_layer_count < CP_MAX_LAYER);
LASSERT(offset < (1 << sizeof(cl_page->cp_layer_offset[0]) * 8));
cl_page->cp_layer_offset[cl_page->cp_layer_count++] = offset;
slice->cpl_obj = obj;
git://git.whamcloud.com / fs / lustre-release.git / blobdiff