*/
/*
* This file is part of Lustre, http://www.lustre.org/
- * Lustre is a trademark of Sun Microsystems, Inc.
*
* Client Lustre Page.
*
atomic_inc(&page->cp_ref);
}
+static struct cl_page_slice *
+cl_page_slice_get(const struct cl_page *cl_page, int index)
+{
+ if (index < 0 || index >= cl_page->cp_layer_count)
+ return NULL;
+
+ /* To get the cp_layer_offset values fit under 256 bytes, we
+ * use the offset beyond the end of struct cl_page.
+ */
+ return (struct cl_page_slice *)((char *)cl_page + sizeof(*cl_page) +
+ cl_page->cp_layer_offset[index]);
+}
+
+#define cl_page_slice_for_each(cl_page, slice, i) \
+ for (i = 0, slice = cl_page_slice_get(cl_page, 0); \
+ i < (cl_page)->cp_layer_count; \
+ slice = cl_page_slice_get(cl_page, ++i))
+
+#define cl_page_slice_for_each_reverse(cl_page, slice, i) \
+ for (i = (cl_page)->cp_layer_count - 1, \
+ slice = cl_page_slice_get(cl_page, i); i >= 0; \
+ slice = cl_page_slice_get(cl_page, --i))
+
/**
- * Returns a slice within a page, corresponding to the given layer in the
+ * Returns a slice within a cl_page, corresponding to the given layer in the
* device stack.
*
* \see cl_lock_at()
*/
static const struct cl_page_slice *
-cl_page_at_trusted(const struct cl_page *page,
+cl_page_at_trusted(const struct cl_page *cl_page,
const struct lu_device_type *dtype)
{
const struct cl_page_slice *slice;
+ int i;
+
ENTRY;
- list_for_each_entry(slice, &page->cp_layers, cpl_linkage) {
+ cl_page_slice_for_each(cl_page, slice, i) {
if (slice->cpl_obj->co_lu.lo_dev->ld_type == dtype)
RETURN(slice);
}
+
RETURN(NULL);
}
}
}
-static void cl_page_free(const struct lu_env *env, struct cl_page *page,
+static void cl_page_free(const struct lu_env *env, struct cl_page *cl_page,
struct pagevec *pvec)
{
- struct cl_object *obj = page->cp_obj;
+ struct cl_object *obj = cl_page->cp_obj;
unsigned short bufsize = 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_state == CPS_FREEING);
+ struct cl_page_slice *slice;
+ int i;
ENTRY;
- while (!list_empty(&page->cp_layers)) {
- struct cl_page_slice *slice;
+ PASSERT(env, cl_page, list_empty(&cl_page->cp_batch));
+ PASSERT(env, cl_page, cl_page->cp_owner == NULL);
+ PASSERT(env, cl_page, cl_page->cp_state == CPS_FREEING);
- slice = list_entry(page->cp_layers.next,
- struct cl_page_slice, cpl_linkage);
- list_del_init(page->cp_layers.next);
+ cl_page_slice_for_each(cl_page, slice, i) {
if (unlikely(slice->cpl_ops->cpo_fini != NULL))
slice->cpl_ops->cpo_fini(env, slice, pvec);
}
+ cl_page->cp_layer_count = 0;
cs_page_dec(obj, CS_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);
- __cl_page_free(page, bufsize);
+ 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);
+ 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_layers);
- 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
}
void cl_page_disown0(const struct lu_env *env,
- struct cl_io *io, struct cl_page *pg)
+ struct cl_io *io, struct cl_page *cl_page)
{
const struct cl_page_slice *slice;
- enum cl_page_state state;
+ enum cl_page_state state;
+ int i;
ENTRY;
- state = pg->cp_state;
- PINVRNT(env, pg, state == CPS_OWNED || state == CPS_FREEING);
- PINVRNT(env, pg, cl_page_invariant(pg) || state == CPS_FREEING);
- cl_page_owner_clear(pg);
-
- if (state == CPS_OWNED)
- cl_page_state_set(env, pg, CPS_CACHED);
+ state = cl_page->cp_state;
+ PINVRNT(env, cl_page, state == CPS_OWNED ||
+ state == CPS_FREEING);
+ PINVRNT(env, cl_page, cl_page_invariant(cl_page) ||
+ state == CPS_FREEING);
+ cl_page_owner_clear(cl_page);
+
+ if (state == CPS_OWNED)
+ cl_page_state_set(env, cl_page, CPS_CACHED);
/*
- * Completion call-backs are executed in the bottom-up order, so that
- * uppermost layer (llite), responsible for VFS/VM interaction runs
- * last and can release locks safely.
- */
- list_for_each_entry_reverse(slice, &pg->cp_layers, cpl_linkage) {
+ * Completion call-backs are executed in the bottom-up order, so that
+ * uppermost layer (llite), responsible for VFS/VM interaction runs
+ * last and can release locks safely.
+ */
+ cl_page_slice_for_each_reverse(cl_page, slice, i) {
if (slice->cpl_ops->cpo_disown != NULL)
(*slice->cpl_ops->cpo_disown)(env, slice, io);
}
- EXIT;
+ EXIT;
}
/**
* Waits until page is in cl_page_state::CPS_CACHED state, and then switch it
* into cl_page_state::CPS_OWNED state.
*
- * \pre !cl_page_is_owned(pg, io)
- * \post result == 0 iff cl_page_is_owned(pg, io)
+ * \pre !cl_page_is_owned(cl_page, io)
+ * \post result == 0 iff cl_page_is_owned(cl_page, io)
*
* \retval 0 success
*
- * \retval -ve failure, e.g., page was destroyed (and landed in
+ * \retval -ve failure, e.g., cl_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_own
*/
static int cl_page_own0(const struct lu_env *env, struct cl_io *io,
- struct cl_page *pg, int nonblock)
+ struct cl_page *cl_page, int nonblock)
{
- int result = 0;
const struct cl_page_slice *slice;
+ int result = 0;
+ int i;
- PINVRNT(env, pg, !cl_page_is_owned(pg, io));
-
- ENTRY;
+ ENTRY;
+ PINVRNT(env, cl_page, !cl_page_is_owned(cl_page, io));
io = cl_io_top(io);
- if (pg->cp_state == CPS_FREEING) {
- result = -ENOENT;
+ if (cl_page->cp_state == CPS_FREEING) {
+ result = -ENOENT;
goto out;
}
- list_for_each_entry(slice, &pg->cp_layers, cpl_linkage) {
+ cl_page_slice_for_each(cl_page, slice, i) {
if (slice->cpl_ops->cpo_own)
result = (*slice->cpl_ops->cpo_own)(env, slice,
io, nonblock);
-
if (result != 0)
break;
-
}
if (result > 0)
result = 0;
if (result == 0) {
- PASSERT(env, pg, pg->cp_owner == NULL);
- 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);
+ PASSERT(env, cl_page, cl_page->cp_owner == NULL);
+ cl_page->cp_owner = cl_io_top(io);
+ cl_page_owner_set(cl_page);
+ if (cl_page->cp_state != CPS_FREEING) {
+ cl_page_state_set(env, cl_page, CPS_OWNED);
} else {
- cl_page_disown0(env, io, pg);
+ cl_page_disown0(env, io, cl_page);
result = -ENOENT;
}
}
out:
- PINVRNT(env, pg, ergo(result == 0, cl_page_invariant(pg)));
- RETURN(result);
+ PINVRNT(env, cl_page, ergo(result == 0,
+ cl_page_invariant(cl_page)));
+ RETURN(result);
}
/**
*
* Called when page is already locked by the hosting VM.
*
- * \pre !cl_page_is_owned(pg, io)
- * \post cl_page_is_owned(pg, io)
+ * \pre !cl_page_is_owned(cl_page, io)
+ * \post cl_page_is_owned(cl_page, io)
*
* \see cl_page_operations::cpo_assume()
*/
void cl_page_assume(const struct lu_env *env,
- struct cl_io *io, struct cl_page *pg)
+ struct cl_io *io, struct cl_page *cl_page)
{
const struct cl_page_slice *slice;
-
- PINVRNT(env, pg, cl_object_same(pg->cp_obj, io->ci_obj));
+ int i;
ENTRY;
+
+ PINVRNT(env, cl_page,
+ cl_object_same(cl_page->cp_obj, io->ci_obj));
io = cl_io_top(io);
- list_for_each_entry(slice, &pg->cp_layers, cpl_linkage) {
+ cl_page_slice_for_each(cl_page, slice, i) {
if (slice->cpl_ops->cpo_assume != NULL)
(*slice->cpl_ops->cpo_assume)(env, slice, io);
}
- 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);
+ PASSERT(env, cl_page, cl_page->cp_owner == NULL);
+ cl_page->cp_owner = cl_io_top(io);
+ cl_page_owner_set(cl_page);
+ cl_page_state_set(env, cl_page, CPS_OWNED);
EXIT;
}
EXPORT_SYMBOL(cl_page_assume);
/**
* Releases page ownership without unlocking the page.
*
- * Moves page into cl_page_state::CPS_CACHED without releasing a lock on the
- * underlying VM page (as VM is supposed to do this itself).
+ * Moves cl_page into cl_page_state::CPS_CACHED without releasing a lock
+ * on the underlying VM page (as VM is supposed to do this itself).
*
- * \pre cl_page_is_owned(pg, io)
- * \post !cl_page_is_owned(pg, io)
+ * \pre cl_page_is_owned(cl_page, io)
+ * \post !cl_page_is_owned(cl_page, io)
*
* \see cl_page_assume()
*/
void cl_page_unassume(const struct lu_env *env,
- struct cl_io *io, struct cl_page *pg)
+ struct cl_io *io, struct cl_page *cl_page)
{
const struct cl_page_slice *slice;
-
- PINVRNT(env, pg, cl_page_is_owned(pg, io));
- PINVRNT(env, pg, cl_page_invariant(pg));
+ int i;
ENTRY;
- io = cl_io_top(io);
- cl_page_owner_clear(pg);
- cl_page_state_set(env, pg, CPS_CACHED);
+ PINVRNT(env, cl_page, cl_page_is_owned(cl_page, io));
+ PINVRNT(env, cl_page, cl_page_invariant(cl_page));
- list_for_each_entry_reverse(slice, &pg->cp_layers, cpl_linkage) {
+ io = cl_io_top(io);
+ cl_page_owner_clear(cl_page);
+ cl_page_state_set(env, cl_page, CPS_CACHED);
+
+ cl_page_slice_for_each_reverse(cl_page, slice, i) {
if (slice->cpl_ops->cpo_unassume != NULL)
(*slice->cpl_ops->cpo_unassume)(env, slice, io);
}
- EXIT;
+ EXIT;
}
EXPORT_SYMBOL(cl_page_unassume);
EXPORT_SYMBOL(cl_page_disown);
/**
- * Called when page is to be removed from the object, e.g., as a result of
- * truncate.
+ * Called when cl_page is to be removed from the object, e.g.,
+ * as a result of truncate.
*
* Calls cl_page_operations::cpo_discard() top-to-bottom.
*
- * \pre cl_page_is_owned(pg, io)
+ * \pre cl_page_is_owned(cl_page, io)
*
* \see cl_page_operations::cpo_discard()
*/
void cl_page_discard(const struct lu_env *env,
- struct cl_io *io, struct cl_page *pg)
+ struct cl_io *io, struct cl_page *cl_page)
{
const struct cl_page_slice *slice;
+ int i;
- PINVRNT(env, pg, cl_page_is_owned(pg, io));
- PINVRNT(env, pg, cl_page_invariant(pg));
+ PINVRNT(env, cl_page, cl_page_is_owned(cl_page, io));
+ PINVRNT(env, cl_page, cl_page_invariant(cl_page));
- list_for_each_entry(slice, &pg->cp_layers, cpl_linkage) {
+ cl_page_slice_for_each(cl_page, slice, i) {
if (slice->cpl_ops->cpo_discard != NULL)
(*slice->cpl_ops->cpo_discard)(env, slice, io);
}
/**
* Version of cl_page_delete() that can be called for not fully constructed
- * pages, e.g. in an error handling cl_page_find()->cl_page_delete0()
- * path. Doesn't check page invariant.
+ * cl_pages, e.g. in an error handling cl_page_find()->cl_page_delete0()
+ * path. Doesn't check cl_page invariant.
*/
-static void cl_page_delete0(const struct lu_env *env, struct cl_page *pg)
+static void cl_page_delete0(const struct lu_env *env,
+ struct cl_page *cl_page)
{
const struct cl_page_slice *slice;
+ int i;
ENTRY;
- PASSERT(env, pg, pg->cp_state != CPS_FREEING);
+ PASSERT(env, cl_page, cl_page->cp_state != CPS_FREEING);
- /*
- * Severe all ways to obtain new pointers to @pg.
- */
- cl_page_owner_clear(pg);
- cl_page_state_set0(env, pg, CPS_FREEING);
+ /*
+ * Severe all ways to obtain new pointers to @pg.
+ */
+ cl_page_owner_clear(cl_page);
+ cl_page_state_set0(env, cl_page, CPS_FREEING);
- list_for_each_entry_reverse(slice, &pg->cp_layers, cpl_linkage) {
+ cl_page_slice_for_each_reverse(cl_page, slice, i) {
if (slice->cpl_ops->cpo_delete != NULL)
(*slice->cpl_ops->cpo_delete)(env, slice);
}
- EXIT;
+ EXIT;
}
/**
*
* \see cl_page_operations::cpo_export()
*/
-void cl_page_export(const struct lu_env *env, struct cl_page *pg, int uptodate)
+void cl_page_export(const struct lu_env *env, struct cl_page *cl_page,
+ int uptodate)
{
const struct cl_page_slice *slice;
+ int i;
- PINVRNT(env, pg, cl_page_invariant(pg));
+ PINVRNT(env, cl_page, cl_page_invariant(cl_page));
- list_for_each_entry(slice, &pg->cp_layers, cpl_linkage) {
+ cl_page_slice_for_each(cl_page, slice, i) {
if (slice->cpl_ops->cpo_export != NULL)
(*slice->cpl_ops->cpo_export)(env, slice, uptodate);
}
EXPORT_SYMBOL(cl_page_export);
/**
- * Returns true, iff \a pg is VM locked in a suitable sense by the calling
+ * Returns true, if \a page is VM locked in a suitable sense by the calling
* thread.
*/
-int cl_page_is_vmlocked(const struct lu_env *env, const struct cl_page *pg)
+int cl_page_is_vmlocked(const struct lu_env *env,
+ const struct cl_page *cl_page)
{
const struct cl_page_slice *slice;
int result;
- ENTRY;
- slice = container_of(pg->cp_layers.next,
- const struct cl_page_slice, cpl_linkage);
- PASSERT(env, pg, slice->cpl_ops->cpo_is_vmlocked != NULL);
+ ENTRY;
+ slice = cl_page_slice_get(cl_page, 0);
+ PASSERT(env, cl_page, slice->cpl_ops->cpo_is_vmlocked != NULL);
/*
- * Call ->cpo_is_vmlocked() directly instead of going through
+ * Call ->cpo_is_vmlocked() directly instead of going through
* CL_PAGE_INVOKE(), because cl_page_is_vmlocked() is used by
* cl_page_invariant().
*/
result = slice->cpl_ops->cpo_is_vmlocked(env, slice);
- PASSERT(env, pg, result == -EBUSY || result == -ENODATA);
- RETURN(result == -EBUSY);
+ PASSERT(env, cl_page, result == -EBUSY || result == -ENODATA);
+
+ RETURN(result == -EBUSY);
}
EXPORT_SYMBOL(cl_page_is_vmlocked);
-void cl_page_touch(const struct lu_env *env, const struct cl_page *pg,
- size_t to)
+void cl_page_touch(const struct lu_env *env,
+ const struct cl_page *cl_page, size_t to)
{
const struct cl_page_slice *slice;
+ int i;
ENTRY;
- list_for_each_entry(slice, &pg->cp_layers, cpl_linkage) {
+ cl_page_slice_for_each(cl_page, slice, i) {
if (slice->cpl_ops->cpo_page_touch != NULL)
(*slice->cpl_ops->cpo_page_touch)(env, slice, to);
}
* transfer now.
*/
int cl_page_prep(const struct lu_env *env, struct cl_io *io,
- struct cl_page *pg, enum cl_req_type crt)
+ struct cl_page *cl_page, enum cl_req_type crt)
{
const struct cl_page_slice *slice;
int result = 0;
+ int i;
- PINVRNT(env, pg, cl_page_is_owned(pg, io));
- PINVRNT(env, pg, cl_page_invariant(pg));
- PINVRNT(env, pg, crt < CRT_NR);
+ PINVRNT(env, cl_page, cl_page_is_owned(cl_page, io));
+ PINVRNT(env, cl_page, cl_page_invariant(cl_page));
+ PINVRNT(env, cl_page, crt < CRT_NR);
/*
- * XXX this has to be called bottom-to-top, so that llite can set up
- * PG_writeback without risking other layers deciding to skip this
- * page.
- */
+ * this has to be called bottom-to-top, so that llite can set up
+ * PG_writeback without risking other layers deciding to skip this
+ * page.
+ */
if (crt >= CRT_NR)
return -EINVAL;
- list_for_each_entry(slice, &pg->cp_layers, cpl_linkage) {
- 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) {
result = 0;
- cl_page_io_start(env, pg, crt);
+ cl_page_io_start(env, cl_page, crt);
}
- CL_PAGE_HEADER(D_TRACE, env, pg, "%d %d\n", crt, result);
+ CL_PAGE_HEADER(D_TRACE, env, cl_page, "%d %d\n", crt, result);
return result;
}
EXPORT_SYMBOL(cl_page_prep);
* uppermost layer (llite), responsible for the VFS/VM interaction runs last
* and can release locks safely.
*
- * \pre pg->cp_state == CPS_PAGEIN || pg->cp_state == CPS_PAGEOUT
- * \post pg->cp_state == CPS_CACHED
+ * \pre cl_page->cp_state == CPS_PAGEIN || cl_page->cp_state == CPS_PAGEOUT
+ * \post cl_page->cl_page_state == CPS_CACHED
*
* \see cl_page_operations::cpo_completion()
*/
void cl_page_completion(const struct lu_env *env,
- struct cl_page *pg, enum cl_req_type crt, int ioret)
+ struct cl_page *cl_page, enum cl_req_type crt,
+ int ioret)
{
const struct cl_page_slice *slice;
- struct cl_sync_io *anchor = pg->cp_sync_io;
-
- PASSERT(env, pg, crt < CRT_NR);
- PASSERT(env, pg, pg->cp_state == cl_req_type_state(crt));
+ struct cl_sync_io *anchor = cl_page->cp_sync_io;
+ int i;
ENTRY;
- CL_PAGE_HEADER(D_TRACE, env, pg, "%d %d\n", crt, ioret);
- cl_page_state_set(env, pg, CPS_CACHED);
+ PASSERT(env, cl_page, crt < CRT_NR);
+ PASSERT(env, cl_page, cl_page->cp_state == cl_req_type_state(crt));
+
+ CL_PAGE_HEADER(D_TRACE, env, cl_page, "%d %d\n", crt, ioret);
+ cl_page_state_set(env, cl_page, CPS_CACHED);
if (crt >= CRT_NR)
return;
- list_for_each_entry_reverse(slice, &pg->cp_layers, cpl_linkage) {
+ cl_page_slice_for_each_reverse(cl_page, slice, i) {
if (slice->cpl_ops->io[crt].cpo_completion != NULL)
(*slice->cpl_ops->io[crt].cpo_completion)(env, slice,
ioret);
}
if (anchor != NULL) {
- LASSERT(pg->cp_sync_io == anchor);
- pg->cp_sync_io = NULL;
+ LASSERT(cl_page->cp_sync_io == anchor);
+ cl_page->cp_sync_io = NULL;
cl_sync_io_note(env, anchor, ioret);
}
EXIT;
* Notify layers that transfer formation engine decided to yank this page from
* the cache and to make it a part of a transfer.
*
- * \pre pg->cp_state == CPS_CACHED
- * \post pg->cp_state == CPS_PAGEIN || pg->cp_state == CPS_PAGEOUT
+ * \pre cl_page->cp_state == CPS_CACHED
+ * \post cl_page->cp_state == CPS_PAGEIN || cl_page->cp_state == CPS_PAGEOUT
*
* \see cl_page_operations::cpo_make_ready()
*/
-int cl_page_make_ready(const struct lu_env *env, struct cl_page *pg,
+int cl_page_make_ready(const struct lu_env *env, struct cl_page *cl_page,
enum cl_req_type crt)
{
- const struct cl_page_slice *sli;
+ const struct cl_page_slice *slice;
int result = 0;
-
- PINVRNT(env, pg, crt < CRT_NR);
+ int i;
ENTRY;
+ PINVRNT(env, cl_page, crt < CRT_NR);
if (crt >= CRT_NR)
RETURN(-EINVAL);
- list_for_each_entry(sli, &pg->cp_layers, cpl_linkage) {
- if (sli->cpl_ops->io[crt].cpo_make_ready != NULL)
- result = (*sli->cpl_ops->io[crt].cpo_make_ready)(env,
- sli);
+ cl_page_slice_for_each(cl_page, slice, i) {
+ if (slice->cpl_ops->io[crt].cpo_make_ready != NULL)
+ result = (*slice->cpl_ops->io[crt].cpo_make_ready)(env, slice);
if (result != 0)
break;
}
if (result >= 0) {
result = 0;
- PASSERT(env, pg, pg->cp_state == CPS_CACHED);
- cl_page_io_start(env, pg, crt);
+ PASSERT(env, cl_page, cl_page->cp_state == CPS_CACHED);
+ cl_page_io_start(env, cl_page, crt);
}
- CL_PAGE_HEADER(D_TRACE, env, pg, "%d %d\n", crt, result);
- RETURN(result);
+ CL_PAGE_HEADER(D_TRACE, env, cl_page, "%d %d\n", crt, result);
+
+ RETURN(result);
}
EXPORT_SYMBOL(cl_page_make_ready);
/**
- * Called if a pge is being written back by kernel's intention.
+ * Called if a page is being written back by kernel's intention.
*
- * \pre cl_page_is_owned(pg, io)
- * \post ergo(result == 0, pg->cp_state == CPS_PAGEOUT)
+ * \pre cl_page_is_owned(cl_page, io)
+ * \post ergo(result == 0, cl_page->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)
+ struct cl_page *cl_page)
{
const struct cl_page_slice *slice;
int result = 0;
-
- PINVRNT(env, pg, cl_page_is_owned(pg, io));
- PINVRNT(env, pg, cl_page_invariant(pg));
+ int i;
ENTRY;
+ PINVRNT(env, cl_page, cl_page_is_owned(cl_page, io));
+ PINVRNT(env, cl_page, cl_page_invariant(cl_page));
- list_for_each_entry(slice, &pg->cp_layers, cpl_linkage) {
+ cl_page_slice_for_each(cl_page, slice, i) {
if (slice->cpl_ops->cpo_flush != NULL)
result = (*slice->cpl_ops->cpo_flush)(env, slice, io);
if (result != 0)
if (result > 0)
result = 0;
- CL_PAGE_HEADER(D_TRACE, env, pg, "%d\n", result);
+ CL_PAGE_HEADER(D_TRACE, env, cl_page, "%d\n", result);
RETURN(result);
}
EXPORT_SYMBOL(cl_page_flush);
*
* \see cl_page_operations::cpo_clip()
*/
-void cl_page_clip(const struct lu_env *env, struct cl_page *pg,
+void cl_page_clip(const struct lu_env *env, struct cl_page *cl_page,
int from, int to)
{
const struct cl_page_slice *slice;
+ int i;
- PINVRNT(env, pg, cl_page_invariant(pg));
+ PINVRNT(env, cl_page, cl_page_invariant(cl_page));
- CL_PAGE_HEADER(D_TRACE, env, pg, "%d %d\n", from, to);
- list_for_each_entry(slice, &pg->cp_layers, cpl_linkage) {
+ CL_PAGE_HEADER(D_TRACE, env, cl_page, "%d %d\n", from, to);
+ cl_page_slice_for_each(cl_page, slice, i) {
if (slice->cpl_ops->cpo_clip != NULL)
(*slice->cpl_ops->cpo_clip)(env, slice, from, to);
}
EXPORT_SYMBOL(cl_page_header_print);
/**
- * Prints human readable representation of \a pg to the \a f.
+ * Prints human readable representation of \a cl_page to the \a f.
*/
void cl_page_print(const struct lu_env *env, void *cookie,
- lu_printer_t printer, const struct cl_page *pg)
+ lu_printer_t printer, const struct cl_page *cl_page)
{
const struct cl_page_slice *slice;
int result = 0;
+ int i;
- cl_page_header_print(env, cookie, printer, pg);
- list_for_each_entry(slice, &pg->cp_layers, cpl_linkage) {
+ cl_page_header_print(env, cookie, printer, cl_page);
+ cl_page_slice_for_each(cl_page, slice, i) {
if (slice->cpl_ops->cpo_print != NULL)
result = (*slice->cpl_ops->cpo_print)(env, slice,
cookie, printer);
if (result != 0)
break;
}
- (*printer)(env, cookie, "end page@%p\n", pg);
+ (*printer)(env, cookie, "end page@%p\n", cl_page);
}
EXPORT_SYMBOL(cl_page_print);
*
* \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, pgoff_t index,
+void cl_page_slice_add(struct cl_page *cl_page, struct cl_page_slice *slice,
+ struct cl_object *obj,
const struct cl_page_operations *ops)
{
+ unsigned int offset = (char *)slice -
+ ((char *)cl_page + sizeof(*cl_page));
+
ENTRY;
- list_add_tail(&slice->cpl_linkage, &page->cp_layers);
+ 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;
- slice->cpl_index = index;
slice->cpl_ops = ops;
- slice->cpl_page = page;
+ slice->cpl_page = cl_page;
+
EXIT;
}
EXPORT_SYMBOL(cl_page_slice_add);
git://git.whamcloud.com / fs / lustre-release.git / blobdiff