/**
* Remove all extended keys for the given @a page from the
* extended key cache.
*/
static ham_status_t
my_fun_free_page_extkeys(ham_btree_t *be, ham_page_t *page, ham_u32_t flags)
{
ham_db_t *db=be_get_db(be);
ham_assert(page_get_owner(page) == db, (0));
ham_assert(0 == (flags & ~DB_MOVE_TO_FREELIST), (0));
/*
* if this page has a header, and it's either a B-Tree root page or
* a B-Tree index page: remove all extended keys from the cache,
* and/or free their blobs
*/
if (page_get_pers(page)
&& (!(page_get_npers_flags(page)&PAGE_NPERS_NO_HEADER))
&& (page_get_type(page)==PAGE_TYPE_B_ROOT
|| page_get_type(page)==PAGE_TYPE_B_INDEX))
{
ham_size_t i;
ham_offset_t blobid;
int_key_t *bte;
btree_node_t *node=ham_page_get_btree_node(page);
extkey_cache_t *c;
ham_assert(db, ("Must be set as page owner when this is a Btree page"));
ham_assert(db=page_get_owner(page), (""));
c=db_get_extkey_cache(db);
for (i=0; i<btree_node_get_count(node); i++)
{
bte=btree_node_get_key(db, node, i);
if (key_get_flags(bte)&KEY_IS_EXTENDED)
{
blobid=key_get_extended_rid(db, bte);
if (env_get_rt_flags(db_get_env(db))&HAM_IN_MEMORY_DB)
{
/* delete the blobid to prevent that it's freed twice */
*(ham_offset_t *)(key_get_key(bte)+
(db_get_keysize(db)-sizeof(ham_offset_t)))=0;
}
//(void)key_erase_record(db, bte, 0, BLOB_FREE_ALL_DUPES);
if (c)
(void)extkey_cache_remove(c, blobid);
}
}
}
return (HAM_SUCCESS);
}
void put_page_type(struct page_info *page)
{
unsigned long nx, x, y = page->u.inuse.type_info;
do {
x = y;
nx = x - 1;
ASSERT((x & PGT_count_mask) != 0);
/*
* The page should always be validated while a reference is held. The
* exception is during domain destruction, when we forcibly invalidate
* page-table pages if we detect a referential loop.
* See domain.c:relinquish_list().
*/
ASSERT((x & PGT_validated) || page_get_owner(page)->is_dying);
if ( unlikely((nx & PGT_count_mask) == 0) )
{
/* Record TLB information for flush later. */
page->tlbflush_timestamp = tlbflush_current_time();
}
}
while ( unlikely((y = cmpxchg(&page->u.inuse.type_info, x, nx)) != x) );
}
/* get_page() to prevent another vcpu freeing the page. */
static int
xencomm_get_page(unsigned long paddr, struct page_info **page)
{
unsigned long maddr = paddr_to_maddr(paddr);
if ( maddr == 0 )
return -EFAULT;
*page = maddr_to_page(maddr);
if ( get_page(*page, current->domain) == 0 )
{
if ( page_get_owner(*page) != current->domain )
{
/*
* This page might be a page granted by another domain, or
* this page is freed with decrease reservation hypercall at
* the same time.
*/
gdprintk(XENLOG_WARNING,
"bad page is passed. paddr 0x%lx maddr 0x%lx\n",
paddr, maddr);
return -EFAULT;
}
/* Try again. */
cpu_relax();
return -EAGAIN;
}
return 0;
}
void share_xen_page_with_guest(struct page_info *page,
struct domain *d, int readonly)
{
if ( page_get_owner(page) == d )
return;
spin_lock(&d->page_alloc_lock);
/* The incremented type count pins as writable or read-only. */
page->u.inuse.type_info = (readonly ? PGT_none : PGT_writable_page);
page->u.inuse.type_info |= PGT_validated | 1;
page_set_owner(page, d);
wmb(); /* install valid domain ptr before updating refcnt. */
ASSERT((page->count_info & ~PGC_xen_heap) == 0);
/* Only add to the allocation list if the domain isn't dying. */
if ( !d->is_dying )
{
page->count_info |= PGC_allocated | 1;
if ( unlikely(d->xenheap_pages++ == 0) )
get_knownalive_domain(d);
page_list_add_tail(page, &d->xenpage_list);
}
spin_unlock(&d->page_alloc_lock);
}
static int
fpswa_get_domain_addr(struct vcpu *v, unsigned long gpaddr, size_t size,
void **virt, struct page_info **page, const char *name)
{
int cross_page_boundary;
if (gpaddr == 0) {
*virt = 0;
return 0;
}
cross_page_boundary = (((gpaddr & ~PAGE_MASK) + size) > PAGE_SIZE);
if (unlikely(cross_page_boundary)) {
/* this case isn't implemented */
gdprintk(XENLOG_ERR,
"%s: fpswa hypercall is called with "
"page crossing argument %s 0x%lx\n",
__func__, name, gpaddr);
return -ENOSYS;
}
again:
*virt = domain_mpa_to_imva(v->domain, gpaddr);
*page = virt_to_page(*virt);
if (get_page(*page, current->domain) == 0) {
if (page_get_owner(*page) != current->domain) {
*page = NULL;
return -EFAULT;
}
goto again;
}
return 0;
}
void share_xen_page_with_guest(
struct page_info *page, struct domain *d, int readonly)
{
if ( page_get_owner(page) == d )
return;
/* this causes us to leak pages in the Domain and reuslts in
* Zombie domains, I think we are missing a piece, until we find
* it we disable the following code */
set_gpfn_from_mfn(page_to_mfn(page), INVALID_M2P_ENTRY);
spin_lock(&d->page_alloc_lock);
/* The incremented type count pins as writable or read-only. */
page->u.inuse.type_info = (readonly ? PGT_none : PGT_writable_page);
page->u.inuse.type_info |= PGT_validated | 1;
page_set_owner(page, d);
wmb(); /* install valid domain ptr before updating refcnt. */
ASSERT(page->count_info == 0);
/* Only add to the allocation list if the domain isn't dying. */
if ( !d->is_dying )
{
page->count_info |= PGC_allocated | 1;
if ( unlikely(d->xenheap_pages++ == 0) )
get_knownalive_domain(d);
list_add_tail(&page->list, &d->xenpage_list);
}
spin_unlock(&d->page_alloc_lock);
}
static void
xenoprof_shared_gmfn_with_guest(
struct domain *d, unsigned long maddr, unsigned long gmaddr, int npages)
{
int i;
for ( i = 0; i < npages; i++, maddr += PAGE_SIZE, gmaddr += PAGE_SIZE )
{
BUG_ON(page_get_owner(maddr_to_page(maddr)) != d);
xenoprof_shared_gmfn(d, gmaddr, maddr);
}
}
static void
unshare_xenoprof_page_with_guest(struct xenoprof *x)
{
int i, npages = x->npages;
unsigned long mfn = virt_to_mfn(x->rawbuf);
for ( i = 0; i < npages; i++ )
{
struct page_info *page = mfn_to_page(mfn + i);
BUG_ON(page_get_owner(page) != current->domain);
if ( test_and_clear_bit(_PGC_allocated, &page->count_info) )
put_page(page);
}
}
void hap_free_p2m_page(struct domain *d, struct page_info *pg)
{
hap_lock(d);
ASSERT(page_get_owner(pg) == d);
/* Should have just the one ref we gave it in alloc_p2m_page() */
if ( (pg->count_info & PGC_count_mask) != 1 )
HAP_ERROR("Odd p2m page count c=%#x t=%"PRtype_info"\n",
pg->count_info, pg->u.inuse.type_info);
pg->count_info = 0;
/* Free should not decrement domain's total allocation, since
* these pages were allocated without an owner. */
page_set_owner(pg, NULL);
free_domheap_page(pg);
d->arch.paging.hap.p2m_pages--;
ASSERT(d->arch.paging.hap.p2m_pages >= 0);
hap_unlock(d);
}
ham_status_t
txn_abort(ham_txn_t *txn, ham_u32_t flags)
{
ham_status_t st;
ham_env_t *env=txn_get_env(txn);
/*
* are cursors attached to this txn? if yes, fail
*/
if (txn_get_cursor_refcount(txn)) {
ham_trace(("transaction cannot be aborted till all attached "
"cursors are closed"));
return HAM_CURSOR_STILL_OPEN;
}
if (env_get_log(env) && !(txn_get_flags(txn)&HAM_TXN_READ_ONLY)) {
st=ham_log_append_txn_abort(env_get_log(env), txn);
if (st)
return st;
}
env_set_txn(env, 0);
/*
* undo all operations from this transaction
*
* this includes allocated pages (they're moved to the freelist),
* deleted pages (they're un-deleted) and other modifications (will
* re-create the original page from the logfile)
*
* keep txn_get_pagelist(txn) intact during every round, so no
* local var for this one.
*/
while (txn_get_pagelist(txn)) {
ham_page_t *head = txn_get_pagelist(txn);
if (!(flags & DO_NOT_NUKE_PAGE_STATS)) {
/*
* nuke critical statistics, such as tracked outer bounds; imagine,
* for example, a failing erase transaction which, through erasing
* the top-most key, lowers the actual upper bound, after which
* the transaction fails at some later point in life. Now if we
* wouldn't 'rewind' our bounds-statistics, we would have a
* situation where a subsequent out-of-bounds insert (~ append)
* would possibly FAIL due to the hinter using incorrect bounds
* information then!
*
* Hence we 'reverse' our statistics here and the easiest route
* is to just nuke the critical bits; subsequent find/insert/erase
* operations will ensure that the stats will get updated again,
* anyhow. All we loose then is a few subsequent operations, which
* might have been hinted if we had played a smarter game of
* statistics 'reversal'. Soit.
*/
ham_db_t *db = page_get_owner(head);
/*
* only need to do this for index pages anyhow, and those are the
* ones which have their 'ownership' set.
*/
if (db) {
stats_page_is_nuked(db, head, HAM_FALSE);
}
}
ham_assert(page_is_in_list(txn_get_pagelist(txn), head, PAGE_LIST_TXN),
(0));
txn_get_pagelist(txn) = page_list_remove(head, PAGE_LIST_TXN, head);
/* if this page was allocated by this transaction, then we can
* move the whole page to the freelist */
if (page_get_alloc_txn_id(head)==txn_get_id(txn)) {
(void)freel_mark_free(env, 0, page_get_self(head),
env_get_pagesize(env), HAM_TRUE);
}
else {
/* remove the 'delete pending' flag */
page_set_npers_flags(head,
page_get_npers_flags(head)&~PAGE_NPERS_DELETE_PENDING);
/* if the page is dirty, and RECOVERY is enabled: recreate
* the original, unmodified page from the log */
if (env_get_log(env) && page_is_dirty(head)) {
st=ham_log_recreate(env_get_log(env), head);
if (st)
return (st);
/*page_set_undirty(head); */
}
}
/* page is no longer in use */
page_release_ref(head);
}
ham_assert(txn_get_pagelist(txn)==0, (0));
return (0);
}
static ham_status_t
__insert_split(ham_page_t *page, ham_key_t *key,
ham_offset_t rid, insert_scratchpad_t *scratchpad,
insert_hints_t *hints)
{
int cmp;
ham_status_t st;
ham_page_t *newpage, *oldsib;
int_key_t *nbte, *obte;
btree_node_t *nbtp, *obtp, *sbtp;
ham_size_t count, keysize;
ham_db_t *db=page_get_owner(page);
ham_env_t *env = db_get_env(db);
ham_key_t pivotkey, oldkey;
ham_offset_t pivotrid;
ham_u16_t pivot;
ham_bool_t pivot_at_end=HAM_FALSE;
ham_assert(page_get_owner(page), (0));
ham_assert(device_get_env(page_get_device(page))
== db_get_env(page_get_owner(page)), (0));
ham_assert(hints->force_append == HAM_FALSE, (0));
keysize=db_get_keysize(db);
/*
* allocate a new page
*/
hints->cost++;
st=db_alloc_page(&newpage, db, PAGE_TYPE_B_INDEX, 0);
ham_assert(st ? page == NULL : 1, (0));
ham_assert(!st ? page != NULL : 1, (0));
if (st)
return st;
ham_assert(page_get_owner(newpage), (""));
/* clear the node header */
memset(page_get_payload(newpage), 0, sizeof(btree_node_t));
stats_page_is_nuked(db, page, HAM_TRUE);
/*
* move half of the key/rid-tuples to the new page
*
* !! recno: keys are sorted; we do a "lazy split"
*/
nbtp=ham_page_get_btree_node(newpage);
nbte=btree_node_get_key(db, nbtp, 0);
obtp=ham_page_get_btree_node(page);
obte=btree_node_get_key(db, obtp, 0);
count=btree_node_get_count(obtp);
/*
* for databases with sequential access (this includes recno databases):
* do not split in the middle, but at the very end of the page
*
* if this page is the right-most page in the index, and this key is
* inserted at the very end, then we select the same pivot as for
* sequential access
*/
if (db_get_data_access_mode(db)&HAM_DAM_SEQUENTIAL_INSERT)
pivot_at_end=HAM_TRUE;
else if (btree_node_get_right(obtp)==0) {
cmp=key_compare_pub_to_int(db, page, key, btree_node_get_count(obtp)-1);
if (cmp>0)
pivot_at_end=HAM_TRUE;
}
/*
* internal pages set the count of the new page to count-pivot-1 (because
* the pivot element will become ptr_left of the new page).
* by using pivot=count-2 we make sure that at least 1 element will remain
* in the new node.
*/
if (pivot_at_end) {
pivot=count-2;
}
else {
pivot=count/2;
}
/*
* uncouple all cursors
*/
st=bt_uncouple_all_cursors(page, pivot);
if (st)
return (st);
/*
* if we split a leaf, we'll insert the pivot element in the leaf
* page, too. in internal nodes, we don't insert it, but propagate
* it to the parent node only.
*/
if (btree_node_is_leaf(obtp)) {
hints->cost += stats_memmove_cost((db_get_int_key_header_size()+keysize)*(count-pivot));
memcpy((char *)nbte,
((char *)obte)+(db_get_int_key_header_size()+keysize)*pivot,
(db_get_int_key_header_size()+keysize)*(count-pivot));
}
else {
hints->cost += stats_memmove_cost((db_get_int_key_header_size()+keysize)*(count-pivot-1));
memcpy((char *)nbte,
((char *)obte)+(db_get_int_key_header_size()+keysize)*(pivot+1),
(db_get_int_key_header_size()+keysize)*(count-pivot-1));
}
/*
* store the pivot element, we'll need it later to propagate it
* to the parent page
*/
nbte=btree_node_get_key(db, obtp, pivot);
memset(&pivotkey, 0, sizeof(pivotkey));
memset(&oldkey, 0, sizeof(oldkey));
oldkey.data=key_get_key(nbte);
oldkey.size=key_get_size(nbte);
oldkey._flags=key_get_flags(nbte);
st = util_copy_key(db, &oldkey, &pivotkey);
if (st)
{
(void)db_free_page(newpage, DB_MOVE_TO_FREELIST);
goto fail_dramatically;
}
pivotrid=page_get_self(newpage);
/*
* adjust the page count
*/
if (btree_node_is_leaf(obtp)) {
btree_node_set_count(obtp, pivot);
btree_node_set_count(nbtp, count-pivot);
}
else {
btree_node_set_count(obtp, pivot);
btree_node_set_count(nbtp, count-pivot-1);
}
/*
* if we're in an internal page: fix the ptr_left of the new page
* (it points to the ptr of the pivot key)
*/
if (!btree_node_is_leaf(obtp)) {
/*
* nbte still contains the pivot key
*/
btree_node_set_ptr_left(nbtp, key_get_ptr(nbte));
}
/*
* insert the new element
*/
hints->cost++;
cmp=key_compare_pub_to_int(db, page, key, pivot);
if (cmp < -1)
{
st = (ham_status_t)cmp;
goto fail_dramatically;
}
if (cmp>=0)
st=__insert_nosplit(newpage, key, rid,
scratchpad->record, scratchpad->cursor, hints);
else
st=__insert_nosplit(page, key, rid,
scratchpad->record, scratchpad->cursor, hints);
if (st)
{
goto fail_dramatically;
}
scratchpad->cursor=0; /* don't overwrite cursor if __insert_nosplit
is called again */
/*
* fix the double-linked list of pages, and mark the pages as dirty
*/
if (btree_node_get_right(obtp))
{
st=db_fetch_page(&oldsib, db, btree_node_get_right(obtp), 0);
if (st)
goto fail_dramatically;
}
else
{
oldsib=0;
}
if (oldsib) {
st=ham_log_add_page_before(oldsib);
if (st)
goto fail_dramatically;
}
btree_node_set_left (nbtp, page_get_self(page));
btree_node_set_right(nbtp, btree_node_get_right(obtp));
btree_node_set_right(obtp, page_get_self(newpage));
if (oldsib) {
sbtp=ham_page_get_btree_node(oldsib);
btree_node_set_left(sbtp, page_get_self(newpage));
page_set_dirty(oldsib, env);
}
page_set_dirty(newpage, env);
page_set_dirty(page, env);
/*
* propagate the pivot key to the parent page
*/
ham_assert(!(scratchpad->key.flags & HAM_KEY_USER_ALLOC), (0));
if (scratchpad->key.data)
allocator_free(env_get_allocator(env), scratchpad->key.data);
scratchpad->key=pivotkey;
scratchpad->rid=pivotrid;
ham_assert(!(scratchpad->key.flags & HAM_KEY_USER_ALLOC), (0));
return (SPLIT);
fail_dramatically:
ham_assert(!(pivotkey.flags & HAM_KEY_USER_ALLOC), (0));
if (pivotkey.data)
allocator_free(env_get_allocator(env), pivotkey.data);
return st;
}
static ham_status_t
__insert_nosplit(ham_page_t *page, ham_key_t *key,
ham_offset_t rid, ham_record_t *record,
ham_bt_cursor_t *cursor, insert_hints_t *hints)
{
ham_status_t st;
ham_u16_t count;
ham_size_t keysize;
ham_size_t new_dupe_id = 0;
int_key_t *bte = 0;
btree_node_t *node;
ham_db_t *db=page_get_owner(page);
ham_bool_t exists = HAM_FALSE;
ham_s32_t slot;
ham_assert(page_get_owner(page), (0));
ham_assert(device_get_env(page_get_device(page)) == db_get_env(page_get_owner(page)), (0));
node=ham_page_get_btree_node(page);
count=btree_node_get_count(node);
keysize=db_get_keysize(db);
if (btree_node_get_count(node)==0)
{
slot = 0;
}
else if (hints->force_append)
{
slot = count;
}
else if (hints->force_prepend)
{
/* insert at beginning; shift all up by one */
slot = 0;
}
else
{
int cmp;
hints->cost++;
st=btree_get_slot(db, page, key, &slot, &cmp);
if (st)
return (st);
/* insert the new key at the beginning? */
if (slot == -1)
{
slot = 0;
}
else
{
/*
* key exists already
*/
if (cmp == 0)
{
if (hints->flags & HAM_OVERWRITE)
{
/*
* no need to overwrite the key - it already exists!
* however, we have to overwrite the data!
*/
if (!btree_node_is_leaf(node))
return (HAM_SUCCESS);
}
else if (!(hints->flags & HAM_DUPLICATE))
return (HAM_DUPLICATE_KEY);
/* do NOT shift keys up to make room; just overwrite the current [slot] */
exists = HAM_TRUE;
}
else
{
/*
* otherwise, if the new key is > then the slot key, move to
* the next slot
*/
if (cmp > 0)
{
slot++;
}
}
}
}
/*
* in any case, uncouple the cursors and see if we must shift any elements to the
* right
*/
bte=btree_node_get_key(db, node, slot);
ham_assert(bte, (0));
if (!exists)
{
if (count > slot)
{
/* uncouple all cursors & shift any elements following [slot] */
st=bt_uncouple_all_cursors(page, slot);
if (st)
return (st);
hints->cost += stats_memmove_cost((db_get_int_key_header_size()+keysize)*(count-slot));
memmove(((char *)bte)+db_get_int_key_header_size()+keysize, bte,
(db_get_int_key_header_size()+keysize)*(count-slot));
}
/*
* if a new key is created or inserted: initialize it with zeroes
*/
memset(bte, 0, db_get_int_key_header_size()+keysize);
}
/*
* if we're in the leaf: insert, overwrite or append the blob
* (depends on the flags)
*/
if (btree_node_is_leaf(node)) {
ham_status_t st;
hints->cost++;
st=key_set_record(db, bte, record,
cursor
? bt_cursor_get_dupe_id(cursor)
: 0,
hints->flags, &new_dupe_id);
if (st)
return (st);
hints->processed_leaf_page = page;
hints->processed_slot = slot;
}
else {
key_set_ptr(bte, rid);
}
page_set_dirty(page, db_get_env(db));
key_set_size(bte, key->size);
/*
* set a flag if the key is extended, and does not fit into the
* btree
*/
if (key->size > db_get_keysize(db))
key_set_flags(bte, key_get_flags(bte)|KEY_IS_EXTENDED);
/*
* if we have a cursor: couple it to the new key
*
* the cursor always points to NIL.
*/
if (cursor)
{
if ((st=bt_cursor_set_to_nil(cursor)))
return (st);
ham_assert(!(bt_cursor_get_flags(cursor)&BT_CURSOR_FLAG_UNCOUPLED),
("coupling an uncoupled cursor, but need a nil-cursor"));
ham_assert(!(bt_cursor_get_flags(cursor)&BT_CURSOR_FLAG_COUPLED),
("coupling a coupled cursor, but need a nil-cursor"));
bt_cursor_set_flags(cursor,
bt_cursor_get_flags(cursor)|BT_CURSOR_FLAG_COUPLED);
bt_cursor_set_coupled_page(cursor, page);
bt_cursor_set_coupled_index(cursor, slot);
bt_cursor_set_dupe_id(cursor, new_dupe_id);
memset(bt_cursor_get_dupe_cache(cursor), 0, sizeof(dupe_entry_t));
page_add_cursor(page, (ham_cursor_t *)cursor);
}
/*
* if we've overwritten a key: no need to continue, we're done
*/
if (exists)
return (0);
/*
* we insert the extended key, if necessary
*/
key_set_key(bte, key->data,
db_get_keysize(db) < key->size ? db_get_keysize(db) : key->size);
/*
* if we need an extended key, allocate a blob and store
* the blob-id in the key
*/
if (key->size > db_get_keysize(db))
{
ham_offset_t blobid;
key_set_key(bte, key->data, db_get_keysize(db));
st=key_insert_extended(&blobid, db, page, key);
ham_assert(st ? blobid == 0 : 1, (0));
if (!blobid)
return st ? st : HAM_INTERNAL_ERROR;
key_set_extended_rid(db, bte, blobid);
}
/*
* update the btree node-header
*/
btree_node_set_count(node, count+1);
return (0);
}
static ham_status_t
__insert_recursive(ham_page_t *page, ham_key_t *key,
ham_offset_t rid, insert_scratchpad_t *scratchpad,
insert_hints_t *hints)
{
ham_status_t st;
ham_page_t *child;
ham_db_t *db=page_get_owner(page);
btree_node_t *node=ham_page_get_btree_node(page);
/*
* if we've reached a leaf: insert the key
*/
if (btree_node_is_leaf(node))
return (__insert_in_page(page, key, rid, scratchpad, hints));
/*
* otherwise traverse the root down to the leaf
*/
hints->cost += 2;
st=btree_traverse_tree(&child, 0, db, page, key);
if (!child)
return st ? st : HAM_INTERNAL_ERROR;
/*
* and call this function recursively
*/
st=__insert_recursive(child, key, rid, scratchpad, hints);
switch (st) {
/*
* if we're done, we're done
*/
case HAM_SUCCESS:
break;
/*
* if we tried to insert a duplicate key, we're done, too
*/
case HAM_DUPLICATE_KEY:
break;
/*
* the child was split, and we have to insert a new key/rid-pair.
*/
case SPLIT:
hints->flags |= HAM_OVERWRITE;
st=__insert_in_page(page, &scratchpad->key,
scratchpad->rid, scratchpad, hints);
ham_assert(!(scratchpad->key.flags & HAM_KEY_USER_ALLOC), (0));
hints->flags = hints->original_flags;
break;
/*
* every other return value is unexpected and shouldn't happen
*/
default:
break;
}
return (st);
}
static ham_status_t
__insert_cursor(ham_btree_t *be, ham_key_t *key, ham_record_t *record,
ham_bt_cursor_t *cursor, insert_hints_t *hints)
{
ham_status_t st;
ham_page_t *root;
ham_db_t *db=be_get_db(be);
ham_env_t *env = db_get_env(db);
insert_scratchpad_t scratchpad;
ham_assert(hints->force_append == HAM_FALSE, (0));
ham_assert(hints->force_prepend == HAM_FALSE, (0));
/*
* initialize the scratchpad
*/
memset(&scratchpad, 0, sizeof(scratchpad));
scratchpad.be=be;
scratchpad.record=record;
scratchpad.cursor=cursor;
/*
* get the root-page...
*/
ham_assert(btree_get_rootpage(be)!=0, ("btree has no root page"));
st=db_fetch_page(&root, db, btree_get_rootpage(be), 0);
ham_assert(st ? root == NULL : 1, (0));
if (st)
return st;
/*
* ... and start the recursion
*/
st=__insert_recursive(root, key, 0, &scratchpad, hints);
/*
* if the root page was split, we have to create a new
* root page.
*/
if (st==SPLIT) {
ham_page_t *newroot;
btree_node_t *node;
/*
* the root-page will be changed...
*/
st=ham_log_add_page_before(root);
if (st)
return (st);
/*
* allocate a new root page
*/
st=db_alloc_page(&newroot, db, PAGE_TYPE_B_ROOT, 0);
ham_assert(st ? newroot == NULL : 1, (0));
if (st)
return (st);
ham_assert(page_get_owner(newroot), (""));
/* clear the node header */
memset(page_get_payload(newroot), 0, sizeof(btree_node_t));
stats_page_is_nuked(db, root, HAM_TRUE);
/*
* insert the pivot element and the ptr_left
*/
node=ham_page_get_btree_node(newroot);
btree_node_set_ptr_left(node, btree_get_rootpage(be));
st=__insert_nosplit(newroot, &scratchpad.key,
scratchpad.rid, scratchpad.record, scratchpad.cursor,
hints);
ham_assert(!(scratchpad.key.flags & HAM_KEY_USER_ALLOC), (0));
scratchpad.cursor=0; /* don't overwrite cursor if __insert_nosplit
is called again */
if (st) {
ham_assert(!(scratchpad.key.flags & HAM_KEY_USER_ALLOC), (0));
if (scratchpad.key.data)
allocator_free(env_get_allocator(env), scratchpad.key.data);
return (st);
}
/*
* set the new root page
*
* !!
* do NOT delete the old root page - it's still in use!
*
* also don't forget to flush the backend - otherwise the header
* page of the database will not contain the updated information.
* The backend is flushed when the database is closed, but if
* recovery is enabled then the flush here is critical.
*/
btree_set_rootpage(be, page_get_self(newroot));
be_set_dirty(be, HAM_TRUE);
be->_fun_flush(be);
/*
* As we re-purpose a page, we will reset its pagecounter
* as well to signal its first use as the new type assigned
* here.
*/
if (env_get_cache(env) && (page_get_type(root)!=PAGE_TYPE_B_INDEX))
cache_update_page_access_counter(root, env_get_cache(env), 0);
page_set_type(root, PAGE_TYPE_B_INDEX);
page_set_dirty(root, env);
page_set_dirty(newroot, env);
/* the root page was modified (btree_set_rootpage) - make sure that
* it's logged */
if (env_get_rt_flags(env)&HAM_ENABLE_RECOVERY) {
st=txn_add_page(env_get_txn(env), env_get_header_page(env),
HAM_TRUE);
if (st)
return (st);
}
}
/*
* release the scratchpad-memory and return to caller
*/
ham_assert(!(scratchpad.key.flags & HAM_KEY_USER_ALLOC), (0));
if (scratchpad.key.data)
allocator_free(env_get_allocator(env), scratchpad.key.data);
return (st);
}
int get_page_type(struct page_info *page, unsigned long type)
{
unsigned long nx, x, y = page->u.inuse.type_info;
ASSERT(!(type & ~PGT_type_mask));
again:
do {
x = y;
nx = x + 1;
if ( unlikely((nx & PGT_count_mask) == 0) )
{
MEM_LOG("Type count overflow on pfn %lx", page_to_mfn(page));
return 0;
}
else if ( unlikely((x & PGT_count_mask) == 0) )
{
if ( (x & PGT_type_mask) != type )
{
/*
* On type change we check to flush stale TLB entries. This
* may be unnecessary (e.g., page was GDT/LDT) but those
* circumstances should be very rare.
*/
cpumask_t mask =
page_get_owner(page)->domain_dirty_cpumask;
tlbflush_filter(mask, page->tlbflush_timestamp);
if ( unlikely(!cpus_empty(mask)) )
{
perfc_incr(need_flush_tlb_flush);
flush_tlb_mask(mask);
}
/* We lose existing type, back pointer, and validity. */
nx &= ~(PGT_type_mask | PGT_validated);
nx |= type;
/* No special validation needed for writable pages. */
/* Page tables and GDT/LDT need to be scanned for validity. */
if ( type == PGT_writable_page )
nx |= PGT_validated;
}
}
else if ( unlikely((x & PGT_type_mask) != type) )
{
return 0;
}
else if ( unlikely(!(x & PGT_validated)) )
{
/* Someone else is updating validation of this page. Wait... */
while ( (y = page->u.inuse.type_info) == x )
cpu_relax();
goto again;
}
}
while ( unlikely((y = cmpxchg(&page->u.inuse.type_info, x, nx)) != x) );
if ( unlikely(!(nx & PGT_validated)) )
{
/* Noone else is updating simultaneously. */
__set_bit(_PGT_validated, &page->u.inuse.type_info);
}
return 1;
}
static ham_status_t
__insert_in_page(ham_page_t *page, ham_key_t *key,
ham_offset_t rid, insert_scratchpad_t *scratchpad,
insert_hints_t *hints)
{
ham_status_t st;
ham_size_t maxkeys=btree_get_maxkeys(scratchpad->be);
btree_node_t *node=ham_page_get_btree_node(page);
ham_assert(maxkeys>1,
("invalid result of db_get_maxkeys(): %d", maxkeys));
ham_assert(hints->force_append == HAM_FALSE, (0));
ham_assert(hints->force_prepend == HAM_FALSE, (0));
/*
* prepare the page for modifications
*/
st=ham_log_add_page_before(page);
if (st)
return (st);
/*
* if we can insert the new key without splitting the page:
* __insert_nosplit() will do the work for us
*/
if (btree_node_get_count(node)<maxkeys) {
st=__insert_nosplit(page, key, rid,
scratchpad->record, scratchpad->cursor, hints);
scratchpad->cursor=0; /* don't overwrite cursor if __insert_nosplit
is called again */
return (st);
}
/*
* otherwise, we have to split the page.
* but BEFORE we split, we check if the key already exists!
*/
if (btree_node_is_leaf(node)) {
ham_s32_t idx;
hints->cost++;
idx = btree_node_search_by_key(page_get_owner(page), page, key,
HAM_FIND_EXACT_MATCH);
/* key exists! */
if (idx>=0) {
ham_assert((hints->flags & (HAM_DUPLICATE_INSERT_BEFORE
|HAM_DUPLICATE_INSERT_AFTER
|HAM_DUPLICATE_INSERT_FIRST
|HAM_DUPLICATE_INSERT_LAST))
? (hints->flags & HAM_DUPLICATE)
: 1, (0));
if (!(hints->flags & (HAM_OVERWRITE | HAM_DUPLICATE)))
return (HAM_DUPLICATE_KEY);
st=__insert_nosplit(page, key, rid,
scratchpad->record, scratchpad->cursor, hints);
/* don't overwrite cursor if __insert_nosplit is called again */
scratchpad->cursor=0;
return (st);
}
}
return (__insert_split(page, key, rid, scratchpad, hints));
}
int
guest_physmap_add_entry(struct domain *d, unsigned long gfn,
unsigned long mfn, unsigned int page_order,
p2m_type_t t)
{
struct p2m_domain *p2m = p2m_get_hostp2m(d);
unsigned long i, ogfn;
p2m_type_t ot;
p2m_access_t a;
mfn_t omfn;
int pod_count = 0;
int rc = 0;
if ( !paging_mode_translate(d) )
{
if ( need_iommu(d) && t == p2m_ram_rw )
{
for ( i = 0; i < (1 << page_order); i++ )
{
rc = iommu_map_page(
d, mfn + i, mfn + i, IOMMUF_readable|IOMMUF_writable);
if ( rc != 0 )
{
while ( i-- > 0 )
iommu_unmap_page(d, mfn + i);
return rc;
}
}
}
return 0;
}
p2m_lock(p2m);
P2M_DEBUG("adding gfn=%#lx mfn=%#lx\n", gfn, mfn);
/* First, remove m->p mappings for existing p->m mappings */
for ( i = 0; i < (1UL << page_order); i++ )
{
omfn = p2m->get_entry(p2m, gfn + i, &ot, &a, 0, NULL);
if ( p2m_is_shared(ot) )
{
/* Do an unshare to cleanly take care of all corner
* cases. */
int rc;
rc = mem_sharing_unshare_page(p2m->domain, gfn + i, 0);
if ( rc )
{
p2m_unlock(p2m);
/* NOTE: Should a guest domain bring this upon itself,
* there is not a whole lot we can do. We are buried
* deep in locks from most code paths by now. So, fail
* the call and don't try to sleep on a wait queue
* while placing the mem event.
*
* However, all current (changeset 3432abcf9380) code
* paths avoid this unsavoury situation. For now.
*
* Foreign domains are okay to place an event as they
* won't go to sleep. */
(void)mem_sharing_notify_enomem(p2m->domain, gfn + i, 0);
return rc;
}
omfn = p2m->get_entry(p2m, gfn + i, &ot, &a, 0, NULL);
ASSERT(!p2m_is_shared(ot));
}
if ( p2m_is_grant(ot) )
{
/* Really shouldn't be unmapping grant maps this way */
domain_crash(d);
p2m_unlock(p2m);
return -EINVAL;
}
else if ( p2m_is_ram(ot) && !p2m_is_paged(ot) )
{
ASSERT(mfn_valid(omfn));
set_gpfn_from_mfn(mfn_x(omfn), INVALID_M2P_ENTRY);
}
else if ( ot == p2m_populate_on_demand )
{
/* Count how man PoD entries we'll be replacing if successful */
pod_count++;
}
else if ( p2m_is_paging(ot) && (ot != p2m_ram_paging_out) )
{
/* We're plugging a hole in the physmap where a paged out page was */
atomic_dec(&d->paged_pages);
}
}
/* Then, look for m->p mappings for this range and deal with them */
for ( i = 0; i < (1UL << page_order); i++ )
{
if ( page_get_owner(mfn_to_page(_mfn(mfn + i))) == dom_cow )
{
/* This is no way to add a shared page to your physmap! */
gdprintk(XENLOG_ERR, "Adding shared mfn %lx directly to dom %hu "
"physmap not allowed.\n", mfn+i, d->domain_id);
p2m_unlock(p2m);
return -EINVAL;
}
if ( page_get_owner(mfn_to_page(_mfn(mfn + i))) != d )
continue;
ogfn = mfn_to_gfn(d, _mfn(mfn+i));
if ( (ogfn != INVALID_M2P_ENTRY) && (ogfn != gfn + i) )
{
/* This machine frame is already mapped at another physical
* address */
P2M_DEBUG("aliased! mfn=%#lx, old gfn=%#lx, new gfn=%#lx\n",
mfn + i, ogfn, gfn + i);
omfn = p2m->get_entry(p2m, ogfn, &ot, &a, 0, NULL);
if ( p2m_is_ram(ot) && !p2m_is_paged(ot) )
{
ASSERT(mfn_valid(omfn));
P2M_DEBUG("old gfn=%#lx -> mfn %#lx\n",
ogfn , mfn_x(omfn));
if ( mfn_x(omfn) == (mfn + i) )
p2m_remove_page(p2m, ogfn, mfn + i, 0);
}
}
}
/* Now, actually do the two-way mapping */
if ( mfn_valid(_mfn(mfn)) )
{
if ( !set_p2m_entry(p2m, gfn, _mfn(mfn), page_order, t, p2m->default_access) )
{
rc = -EINVAL;
goto out; /* Failed to update p2m, bail without updating m2p. */
}
if ( !p2m_is_grant(t) )
{
for ( i = 0; i < (1UL << page_order); i++ )
set_gpfn_from_mfn(mfn+i, gfn+i);
}
}
else
{
gdprintk(XENLOG_WARNING, "Adding bad mfn to p2m map (%#lx -> %#lx)\n",
gfn, mfn);
if ( !set_p2m_entry(p2m, gfn, _mfn(INVALID_MFN), page_order,
p2m_invalid, p2m->default_access) )
rc = -EINVAL;
else
{
pod_lock(p2m);
p2m->pod.entry_count -= pod_count;
BUG_ON(p2m->pod.entry_count < 0);
pod_unlock(p2m);
}
}
out:
p2m_unlock(p2m);
return rc;
}