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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 2008 WiredTiger Software.
* All rights reserved.
*
* $Id$
*/
#include "wt_internal.h"
/*
* __wt_bt_ovfl_in --
* Read an overflow item from the cache.
*/
int
__wt_bt_ovfl_in(DB *db, u_int32_t addr, u_int32_t len, WT_PAGE **pagep)
{
ENV *env;
WT_PAGE *page;
WT_STOC *stoc;
env = db->env;
stoc = db->idb->stoc;
WT_RET(__wt_cache_in(
stoc, WT_ADDR_TO_OFF(db, addr), WT_OVFL_BYTES(db, len), 0, &page));
/* Verify the page. */
WT_ASSERT(env, __wt_bt_verify_page(db, page, NULL, NULL) == 0);
*pagep = page;
return (0);
}
/*
* __wt_bt_ovfl_write --
* Store an overflow item in the database, returning the starting
* addr.
*/
int
__wt_bt_ovfl_write(DB *db, DBT *dbt, u_int32_t *addrp)
{
WT_PAGE *page;
WT_STOC *stoc;
stoc = db->idb->stoc;
/* Allocate a chunk of file space. */
WT_RET(__wt_cache_alloc(stoc, WT_OVFL_BYTES(db, dbt->size), &page));
/* Initialize the page and copy the overflow item in. */
page->hdr->type = WT_PAGE_OVFL;
page->hdr->u.datalen = dbt->size;
page->hdr->prntaddr =
page->hdr->prevaddr = page->hdr->nextaddr = WT_ADDR_INVALID;
/* Return the page address to the caller. */
*addrp = page->addr;
/* Copy the record into place. */
memcpy(WT_PAGE_BYTE(page), dbt->data, dbt->size);
/* Write the overflow item back to the file. */
return (__wt_bt_page_out(db, page, WT_MODIFIED));
}
/*
* __wt_bt_ovfl_copy --
* Copy an overflow item in the database, returning the starting
* addr. This routine is used when an overflow item is promoted
* to an internal page.
*/
int
__wt_bt_ovfl_copy(DB *db, WT_ITEM_OVFL *from, WT_ITEM_OVFL *copy)
{
DBT dbt;
WT_PAGE *ovfl_page;
int ret;
/* Read in the overflow record. */
WT_RET(__wt_bt_ovfl_in(db, from->addr, from->len, &ovfl_page));
/*
* Copy the overflow record to a new location, and set our return
* information.
*/
WT_CLEAR(dbt);
dbt.data = WT_PAGE_BYTE(ovfl_page);
dbt.size = from->len;
ret = __wt_bt_ovfl_write(db, &dbt, ©->addr);
copy->len = from->len;
/* Discard the overflow record. */
WT_TRET(__wt_bt_page_out(db, ovfl_page, 0));
return (ret);
}
/*
* __wt_bt_ovfl_to_dbt --
* Copy an overflow item into allocated memory in a DBT.
*/
int
__wt_bt_ovfl_to_dbt(DB *db, WT_ITEM_OVFL *ovfl, DBT *copy)
{
WT_PAGE *ovfl_page;
int ret;
WT_RET(__wt_bt_ovfl_in(db, ovfl->addr, ovfl->len, &ovfl_page));
ret = __wt_bt_data_copy_to_dbt(
db, WT_PAGE_BYTE(ovfl_page), ovfl->len, copy);
WT_TRET(__wt_bt_page_out(db, ovfl_page, 0));
return (ret);
}
/*
* __wt_bt_ovfl_to_indx --
* Copy an overflow item into allocated memory in a WT_INDX
*/
int
__wt_bt_ovfl_to_indx(DB *db, WT_PAGE *page, WT_INDX *ip)
{
ENV *env;
WT_PAGE *ovfl_page;
env = db->env;
WT_RET(
__wt_bt_ovfl_in(db, WT_INDX_OVFL_ADDR(ip), ip->size, &ovfl_page));
WT_RET(__wt_calloc(env, ip->size, 1, &ip->data));
memcpy(ip->data, WT_PAGE_BYTE(ovfl_page), ip->size);
WT_RET(__wt_bt_page_out(db, ovfl_page, 0));
F_SET(ip, WT_ALLOCATED);
F_SET(page, WT_ALLOCATED);
return (0);
}
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