/*
* __wt_page_obsolete --
* Discard all obsolete updates on a row-store leaf page.
*/
void
__wt_row_leaf_obsolete(WT_SESSION_IMPL *session, WT_PAGE *page)
{
WT_INSERT *ins;
WT_ROW *rip;
WT_UPDATE *upd;
uint32_t i;
/* For entries before the first on-page record... */
WT_SKIP_FOREACH(ins, WT_ROW_INSERT_SMALLEST(page))
if ((upd =
__wt_update_obsolete_check(session, ins->upd)) != NULL)
__wt_update_obsolete_free(session, page, upd);
/* For each entry on the page... */
WT_ROW_FOREACH(page, rip, i) {
if ((upd = __wt_update_obsolete_check(
session, WT_ROW_UPDATE(page, rip))) != NULL)
__wt_update_obsolete_free(session, page, upd);
WT_SKIP_FOREACH(ins, WT_ROW_INSERT(page, rip))
if ((upd = __wt_update_obsolete_check(
session, ins->upd)) != NULL)
__wt_update_obsolete_free(session, page, upd);
}
}
/*
* __wt_col_leaf_obsolete --
* Discard all obsolete updates on a column-store leaf page.
*/
void
__wt_col_leaf_obsolete(WT_SESSION_IMPL *session, WT_PAGE *page)
{
uint32_t i;
WT_COL *cip;
WT_INSERT *ins;
WT_UPDATE *upd;
switch (page->type) {
case WT_PAGE_COL_FIX:
WT_SKIP_FOREACH(ins, WT_COL_UPDATE_SINGLE(page))
if ((upd = __wt_update_obsolete_check(
session, ins->upd)) != NULL)
__wt_update_obsolete_free(session, page, upd);
break;
case WT_PAGE_COL_VAR:
WT_COL_FOREACH(page, cip, i)
WT_SKIP_FOREACH(ins, WT_COL_UPDATE(page, cip))
if ((upd = __wt_update_obsolete_check(
session, ins->upd)) != NULL)
__wt_update_obsolete_free(
session, page, upd);
break;
}
/* Walk any append list. */
WT_SKIP_FOREACH(ins, WT_COL_APPEND(page)) {
if ((upd =
__wt_update_obsolete_check(session, ins->upd)) != NULL)
__wt_update_obsolete_free(session, page, upd);
}
}
/*
* __wt_update_serial_func --
* Server function to add an WT_UPDATE entry in the page array.
*/
int
__wt_update_serial_func(WT_SESSION_IMPL *session, void *args)
{
WT_PAGE *page;
WT_UPDATE **new_upd, *upd, **upd_entry, **upd_obsolete;
uint32_t write_gen;
__wt_update_unpack(
args, &page, &write_gen, &upd_entry, &new_upd, &upd, &upd_obsolete);
/* Check the page's write-generation. */
WT_RET(__wt_page_write_gen_check(session, page, write_gen));
upd->next = *upd_entry;
/*
* Publish: there must be a barrier to ensure the new entry's next
* pointer is set before we update the linked list.
*/
WT_PUBLISH(*upd_entry, upd);
__wt_update_upd_taken(session, args, page);
/*
* If the page needs an update array (column-store pages and inserts on
* row-store pages do not use the update array), our caller passed us
* one of the correct size. Check the page still needs one (the write
* generation test should have caught that, though).
*
* NOTE: it is important to do this after publishing that the update is
* set. Code can assume that if the array is set, it is non-empty.
*/
if (new_upd != NULL && page->u.row.upd == NULL) {
page->u.row.upd = new_upd;
__wt_update_new_upd_taken(session, args, page);
}
/* Discard obsolete WT_UPDATE structures. */
*upd_obsolete = __wt_update_obsolete_check(session, upd->next);
__wt_page_and_tree_modify_set(session, page);
return (0);
}
