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/* Copyright (C) 2001-2005 by Hans Reiser, licensing governed by
reiser4progs/COPYING.
item.c -- common reiser4 item functions. */
#include <reiser4/libreiser4.h>
/* Returns count of units in item. If count method is not implemented, it
returns 1. */
uint32_t reiser4_item_units(reiser4_place_t *place) {
aal_assert("umka-1030", place != NULL);
aal_assert("umka-1448", place->plug != NULL);
if (place->plug->balance->units) {
return objcall(place, balance->units);
}
return 1;
}
#ifndef ENABLE_MINIMAL
bool_t reiser4_item_statdata(reiser4_place_t *place) {
aal_assert("umka-1831", place != NULL);
aal_assert("umka-2382", place->plug != NULL);
return place->plug->p.id.group == STAT_ITEM;
}
/* Returns item type from its plugin */
rid_t reiser4_item_type(reiser4_place_t *place) {
aal_assert("vpf-424", place != NULL);
aal_assert("vpf-425", place->plug != NULL);
if (place->plug->p.id.type != ITEM_PLUG_TYPE)
return LAST_ITEM;
return (place->plug->p.id.group < LAST_ITEM ?
place->plug->p.id.group : LAST_ITEM);
}
int reiser4_item_mergeable(reiser4_place_t *place1, reiser4_place_t *place2) {
aal_assert("vpf-1428", place1 != NULL);
aal_assert("vpf-1428", place2 != NULL);
/* Check if plugins are equal */
if (!plug_equal(place1->plug, place2->plug))
return 0;
/* Check if mergeable is implemented and calling it if it is. */
return place1->plug->balance->mergeable &&
place1->plug->balance->mergeable(place1, place2);
}
#endif
/* Returns 1 if @place points to an nodeptr item. */
bool_t reiser4_item_branch(reiser4_item_plug_t *plug) {
aal_assert("umka-1829", plug != NULL);
return (plug->p.id.group == PTR_ITEM);
}
/* Returns maximal possible key may exist in item at @place. */
errno_t reiser4_item_maxposs_key(reiser4_place_t *place,
reiser4_key_t *key)
{
aal_assert("umka-1270", key != NULL);
aal_assert("umka-1269", place != NULL);
aal_assert("umka-1456", place->plug != NULL);
aal_memcpy(key, &place->key, sizeof(*key));
if (!place->plug->balance->maxposs_key)
return 0;
return objcall(place, balance->maxposs_key, key);
}
#ifndef ENABLE_MINIMAL
/* Returns real maximal item key */
errno_t reiser4_item_maxreal_key(reiser4_place_t *place,
reiser4_key_t *key)
{
aal_assert("vpf-352", key != NULL);
aal_assert("vpf-351", place != NULL);
aal_assert("umka-1457", place->plug != NULL);
aal_memcpy(key, &place->key, sizeof(*key));
if (!place->plug->balance->maxreal_key)
return 0;
return objcall(place, balance->maxreal_key, key);
}
errno_t reiser4_item_update_key(reiser4_place_t *place,
reiser4_key_t *key)
{
aal_assert("vpf-1205", key != NULL);
aal_assert("vpf-1205", place != NULL);
aal_memcpy(&place->key, key, sizeof(*key));
return reiser4_node_update_key(place->node,
&place->pos,
&place->key);
}
#endif
errno_t reiser4_item_get_key(reiser4_place_t *place,
reiser4_key_t *key)
{
aal_assert("vpf-1290", place != NULL);
aal_assert("vpf-1291", key != NULL);
/* Getting key from item or node and updating it in passed @place. */
key->plug = place->key.plug;
if (place->plug->balance->fetch_key &&
(place->pos.unit && place->pos.unit != MAX_UINT32))
{
objcall(place, balance->fetch_key, key);
} else {
objcall(place->node, get_key, &place->pos, key);
}
return 0;
}
#ifndef ENABLE_MINIMAL
errno_t reiser4_item_update_link(reiser4_place_t *place,
blk_t blk)
{
trans_hint_t hint;
ptr_hint_t ptr;
aal_assert("umka-2668", place != NULL);
/* Prepare @hint. */
hint.count = 1;
hint.specific = &ptr;
ptr.start = blk;
ptr.width = 1;
if (objcall(place, object->update_units, &hint) != 1)
return -EIO;
return 0;
}
uint16_t reiser4_item_overhead(reiser4_item_plug_t *plug) {
aal_assert("vpf-1514", plug != NULL);
aal_assert("vpf-1515", plug->p.id.type == ITEM_PLUG_TYPE);
if (!plug->balance->overhead)
return 0;
return plugcall(plug->balance, overhead);
}
void reiser4_item_set_flag(reiser4_place_t *place, uint16_t flag) {
uint16_t old;
aal_assert("vpf-1041", place != NULL);
aal_assert("vpf-1111", place->node != NULL);
aal_assert("vpf-1530", flag < sizeof(flag) * 8 - 1);
old = objcall(place->node, get_flags, place->pos.item);
if (old & (1 << flag))
return;
objcall(place->node, set_flags, place->pos.item, old | (1 << flag));
}
void reiser4_item_clear_flag(reiser4_place_t *place, uint16_t flag) {
uint16_t old;
aal_assert("vpf-1531", place != NULL);
aal_assert("vpf-1532", place->node != NULL);
aal_assert("vpf-1533", flag < sizeof(flag) * 8 - 1);
old = objcall(place->node, get_flags, place->pos.item);
if (~old & (1 << flag))
return;
objcall(place->node, set_flags, place->pos.item, old & ~(1 << flag));
}
void reiser4_item_clear_flags(reiser4_place_t *place) {
uint16_t old;
aal_assert("vpf-1042", place != NULL);
aal_assert("vpf-1112", place->node != NULL);
old = objcall(place->node, get_flags, place->pos.item);
if (!old) return;
objcall(place->node, set_flags, place->pos.item, 0);
}
bool_t reiser4_item_test_flag(reiser4_place_t *place, uint16_t flag) {
uint16_t old;
aal_assert("vpf-1043", place != NULL);
aal_assert("vpf-1113", place->node != NULL);
aal_assert("vpf-1534", flag < sizeof(flag) * 8 - 1);
old = objcall(place->node, get_flags, place->pos.item);
return old & (1 << flag);
}
void reiser4_item_dup_flags(reiser4_place_t *place, uint16_t flags) {
aal_assert("vpf-1540", place != NULL);
objcall(place->node, set_flags, place->pos.item, flags);
}
uint16_t reiser4_item_get_flags(reiser4_place_t *place) {
aal_assert("vpf-1541", place != NULL);
return objcall(place->node, get_flags, place->pos.item);
}
lookup_t reiser4_item_collision(reiser4_place_t *place, coll_hint_t *hint) {
aal_assert("vpf-1550", place != NULL);
aal_assert("vpf-1551", place->plug != NULL);
if (!place->plug->balance->collision)
return PRESENT;
return place->plug->balance->collision(place, hint);
}
#endif
/* Return block number nodeptr item contains. */
blk_t reiser4_item_down_link(reiser4_place_t *place) {
trans_hint_t hint;
ptr_hint_t ptr;
aal_assert("umka-2666", place != NULL);
/* Prepare @hint. */
hint.count = 1;
hint.specific = &ptr;
if (objcall(place, object->fetch_units, &hint) != 1)
return MAX_UINT64;
return ptr.start;
}
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