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/* Copyright (C) 2001-2005 by Hans Reiser, licensing governed by
reiser4progs/COPYING.
nodeptr40.c -- reiser4 default node pointer item plugin. */
#include "nodeptr40.h"
#include "nodeptr40_repair.h"
reiser4_core_t *nodeptr40_core = NULL;
/* Returns the number of units in nodeptr. As nodeptr40 has not units and thus
cannot be splitted by balancing, it has one unit. */
static uint32_t nodeptr40_units(reiser4_place_t *place) {
return 1;
}
/* Fetches nodeptr into passed @hint */
static int64_t nodeptr40_fetch_units(reiser4_place_t *place,
trans_hint_t *hint)
{
nodeptr40_t *nodeptr;
ptr_hint_t *ptr_hint;
aal_assert("umka-1420", hint != NULL);
aal_assert("umka-1419", place != NULL);
nodeptr = nodeptr40_body(place);
ptr_hint = (ptr_hint_t *)hint->specific;
ptr_hint->width = 1;
ptr_hint->start = np40_get_ptr(nodeptr);
return 1;
}
#ifndef ENABLE_MINIMAL
/* Update nodeptr block number by passed @blk. */
static errno_t nodeptr40_update_units(reiser4_place_t *place,
trans_hint_t *hint)
{
ptr_hint_t *ptr;
aal_assert("umka-2667", place != NULL);
aal_assert("vpf-1863", hint != NULL);
ptr = (ptr_hint_t *)hint->specific;
np40_set_ptr(nodeptr40_body(place), ptr->start);
place_mkdirty(place);
return 1;
}
/* Layout implementation for nodeptr40. It calls @geion_func for each block
nodeptr points to. */
static errno_t nodeptr40_layout(reiser4_place_t *place,
region_func_t region_func,
void *data)
{
blk_t blk;
aal_assert("umka-1749", place != NULL);
aal_assert("umka-2354", place->body != NULL);
aal_assert("umka-1750", region_func != NULL);
blk = np40_get_ptr(nodeptr40_body(place));
return region_func(blk, 1, data);
}
/* Estimates how many bytes is needed for creating new nodeptr */
static errno_t nodeptr40_prep_insert(reiser4_place_t *place,
trans_hint_t *hint)
{
aal_assert("vpf-068", hint != NULL);
aal_assert("umka-2436", place != NULL);
hint->overhead = 0;
hint->len = sizeof(nodeptr40_t);
return 0;
}
/* Writes of the specified nodeptr into passed @place */
static int64_t nodeptr40_insert_units(reiser4_place_t *place,
trans_hint_t *hint)
{
nodeptr40_t *nodeptr;
ptr_hint_t *ptr_hint;
aal_assert("umka-1424", hint != NULL);
aal_assert("umka-1423", place != NULL);
nodeptr = nodeptr40_body(place);
ptr_hint = (ptr_hint_t *)hint->specific;
np40_set_ptr(nodeptr, ptr_hint->start);
place_mkdirty(place);
return 1;
}
/* Removes nodeptr unit. Asit is always one, we only set up passed @hint here by
sizeof nodeptr40_t struct. */
static errno_t nodeptr40_remove_units(reiser4_place_t *place,
trans_hint_t *hint)
{
aal_assert("umka-3029", hint != NULL);
aal_assert("umka-3028", place != NULL);
hint->overhead = 0;
hint->len = sizeof(nodeptr40_t);
return 0;
}
#endif
static item_balance_ops_t balance_ops = {
#ifndef ENABLE_MINIMAL
.merge = NULL,
.prep_shift = NULL,
.shift_units = NULL,
.maxreal_key = NULL,
.update_key = NULL,
.mergeable = NULL,
.collision = NULL,
.overhead = NULL,
#endif
.init = NULL,
.lookup = NULL,
.fetch_key = NULL,
.maxposs_key = NULL,
.units = nodeptr40_units
};
static item_object_ops_t object_ops = {
#ifndef ENABLE_MINIMAL
.layout = nodeptr40_layout,
.prep_insert = nodeptr40_prep_insert,
.insert_units = nodeptr40_insert_units,
.remove_units = nodeptr40_remove_units,
.prep_write = NULL,
.write_units = NULL,
.update_units = nodeptr40_update_units,
.trunc_units = NULL,
.size = NULL,
.bytes = NULL,
#endif
.read_units = NULL,
.fetch_units = nodeptr40_fetch_units
};
#ifndef ENABLE_MINIMAL
static item_repair_ops_t repair_ops = {
.check_struct = nodeptr40_check_struct,
.check_layout = nodeptr40_check_layout,
.prep_insert_raw = NULL,
.insert_raw = NULL,
.pack = NULL,
.unpack = NULL
};
static item_debug_ops_t debug_ops = {
.print = nodeptr40_print,
};
#endif
reiser4_item_plug_t nodeptr40_plug = {
.p = {
.id = {ITEM_NODEPTR40_ID, PTR_ITEM, ITEM_PLUG_TYPE},
#ifndef ENABLE_MINIMAL
.label = "nodeptr40",
.desc = "Node pointer item plugin.",
#endif
},
.object = &object_ops,
.balance = &balance_ops,
#ifndef ENABLE_MINIMAL
.repair = &repair_ops,
.debug = &debug_ops
#endif
};
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