/* Insert n_src'th key of buffer src before n_dest'th key of buffer dest. */
static void internal_insert_key(struct buffer_info *dest_bi,
/* insert key before key with n_dest number */
int dest_position_before,
struct buffer_head *src, int src_position)
{
struct buffer_head *dest = dest_bi->bi_bh;
int nr;
struct block_head *blkh;
struct reiserfs_key *key;
RFALSE(dest == NULL || src == NULL,
"source(%p) or dest(%p) buffer is 0", src, dest);
RFALSE(dest_position_before < 0 || src_position < 0,
"source(%d) or dest(%d) key number less than 0",
src_position, dest_position_before);
RFALSE(dest_position_before > B_NR_ITEMS(dest) ||
src_position >= B_NR_ITEMS(src),
"invalid position in dest (%d (key number %d)) or in src (%d (key number %d))",
dest_position_before, B_NR_ITEMS(dest),
src_position, B_NR_ITEMS(src));
RFALSE(B_FREE_SPACE(dest) < KEY_SIZE,
"no enough free space (%d) in dest buffer", B_FREE_SPACE(dest));
blkh = B_BLK_HEAD(dest);
nr = blkh_nr_item(blkh);
/* prepare space for inserting key */
key = internal_key(dest, dest_position_before);
memmove(key + 1, key,
(nr - dest_position_before) * KEY_SIZE + (nr + 1) * DC_SIZE);
/* insert key */
memcpy(key, internal_key(src, src_position), KEY_SIZE);
/* Change dirt, free space, item number fields. */
set_blkh_nr_item(blkh, blkh_nr_item(blkh) + 1);
set_blkh_free_space(blkh, blkh_free_space(blkh) - KEY_SIZE);
do_balance_mark_internal_dirty(dest_bi->tb, dest, 0);
if (dest_bi->bi_parent) {
struct disk_child *t_dc;
t_dc = B_N_CHILD(dest_bi->bi_parent, dest_bi->bi_position);
put_dc_size(t_dc, dc_size(t_dc) + KEY_SIZE);
do_balance_mark_internal_dirty(dest_bi->tb, dest_bi->bi_parent,
0);
}
}
/* Returns 1 if buf looks like an internal node, 0 otherwise */
static int
is_internal(char *buf, int blocksize, struct buf *bp)
{
int nr, used_space;
struct block_head *blkh;
blkh = (struct block_head *)buf;
nr = blkh_level(blkh);
if (nr <= DISK_LEAF_NODE_LEVEL || nr > MAX_HEIGHT) {
/* This level is not possible for internal nodes */
reiserfs_log(LOG_WARNING, "this should be caught earlier\n");
return (0);
}
nr = blkh_nr_item(blkh);
if (nr > (blocksize - BLKH_SIZE - DC_SIZE) / (KEY_SIZE + DC_SIZE)) {
/*
* For internal which is not root we might check min
* number of keys
*/
reiserfs_log(LOG_WARNING, "number of key seems wrong\n");
return (0);
}
used_space = BLKH_SIZE + KEY_SIZE * nr + DC_SIZE * (nr + 1);
if (used_space != blocksize - blkh_free_space(blkh)) {
reiserfs_log(LOG_WARNING,
"is_internal: free space seems wrong\n");
return (0);
}
/* One may imagine much more checks */
return (1);
}
/* returns 1 if buf looks like an internal node, 0 otherwise */
static int is_internal(char *buf, int blocksize, struct buffer_head *bh)
{
struct block_head *blkh;
int nr;
int used_space;
blkh = (struct block_head *)buf;
nr = blkh_level(blkh);
if (nr <= DISK_LEAF_NODE_LEVEL || nr > MAX_HEIGHT) {
/* this level is not possible for internal nodes */
reiserfs_warning(NULL, "reiserfs-5087",
"this should be caught earlier");
return 0;
}
nr = blkh_nr_item(blkh);
if (nr > (blocksize - BLKH_SIZE - DC_SIZE) / (KEY_SIZE + DC_SIZE)) {
/* for internal which is not root we might check min number of keys */
reiserfs_warning(NULL, "reiserfs-5088",
"number of key seems wrong: %z", bh);
return 0;
}
used_space = BLKH_SIZE + KEY_SIZE * nr + DC_SIZE * (nr + 1);
if (used_space != blocksize - blkh_free_space(blkh)) {
reiserfs_warning(NULL, "reiserfs-5089",
"free space seems wrong: %z", bh);
return 0;
}
// one may imagine much more checks
return 1;
}
static int print_leaf(struct buffer_head *bh, int print_mode, int first,
int last)
{
struct block_head *blkh;
struct item_head *ih;
int i, nr;
int from, to;
if (!B_IS_ITEMS_LEVEL(bh))
return 1;
check_leaf(bh);
blkh = B_BLK_HEAD(bh);
ih = B_N_PITEM_HEAD(bh, 0);
nr = blkh_nr_item(blkh);
printk
("\n===================================================================\n");
reiserfs_printk("LEAF NODE (%ld) contains %z\n", bh->b_blocknr, bh);
if (!(print_mode & PRINT_LEAF_ITEMS)) {
reiserfs_printk("FIRST ITEM_KEY: %k, LAST ITEM KEY: %k\n",
&(ih->ih_key), &((ih + nr - 1)->ih_key));
return 0;
}
if (first < 0 || first > nr - 1)
from = 0;
else
from = first;
if (last < 0 || last > nr)
to = nr;
else
to = last;
ih += from;
printk
("-------------------------------------------------------------------------------\n");
printk
("|##| type | key | ilen | free_space | version | loc |\n");
for (i = from; i < to; i++, ih++) {
printk
("-------------------------------------------------------------------------------\n");
reiserfs_printk("|%2d| %h |\n", i, ih);
if (print_mode & PRINT_LEAF_ITEMS)
op_print_item(ih, B_I_PITEM(bh, ih));
}
printk
("===================================================================\n");
return 0;
}
static void check_leaf_block_head (struct buffer_head * bh)
{
struct block_head * blkh;
int nr;
blkh = B_BLK_HEAD (bh);
nr = blkh_nr_item(blkh);
if ( nr > (bh->b_size - BLKH_SIZE) / IH_SIZE)
reiserfs_panic (0, "vs-6010: check_leaf_block_head: invalid item number %z", bh);
if ( blkh_free_space(blkh) >
bh->b_size - BLKH_SIZE - IH_SIZE * nr )
reiserfs_panic (0, "vs-6020: check_leaf_block_head: invalid free space %z", bh);
}
/* Read in the node at the current path and depth into the node cache.
* You must set INFO->blocks[depth] before.
*/
static char *
read_tree_node( __u32 blockNr, __u16 depth )
{
char *cache = CACHE(depth);
int num_cached = INFO->cached_slots;
errnum = 0;
if ( depth < num_cached )
{
/* This is the cached part of the path.
Check if same block is needed. */
if ( blockNr == INFO->blocks[depth] )
return cache;
}
else
cache = CACHE(num_cached);
DEBUG_F( " next read_in: block=%u (depth=%u)\n", blockNr, depth );
if ( !block_read( blockNr, 0, INFO->blocksize, cache ) )
{
DEBUG_F( "block_read failed\n" );
return 0;
}
DEBUG_F( "FOUND: blk_level=%u, blk_nr_item=%u, blk_free_space=%u\n",
blkh_level(BLOCKHEAD(cache)),
blkh_nr_item(BLOCKHEAD(cache)),
le16_to_cpu(BLOCKHEAD(cache)->blk_free_space) );
/* Make sure it has the right node level */
if ( blkh_level(BLOCKHEAD(cache)) != depth )
{
DEBUG_F( "depth = %u != %u\n", blkh_level(BLOCKHEAD(cache)), depth );
DEBUG_LEAVE(FILE_ERR_BAD_FSYS);
errnum = FILE_ERR_BAD_FSYS;
return 0;
}
INFO->blocks[depth] = blockNr;
return cache;
}
static int
is_leaf(char *buf, int blocksize, struct buf *bp)
{
struct item_head *ih;
struct block_head *blkh;
int used_space, prev_location, i, nr;
blkh = (struct block_head *)buf;
if (blkh_level(blkh) != DISK_LEAF_NODE_LEVEL) {
reiserfs_log(LOG_WARNING, "this should be caught earlier");
return (0);
}
nr = blkh_nr_item(blkh);
if (nr < 1 || nr >
((blocksize - BLKH_SIZE) / (IH_SIZE + MIN_ITEM_LEN))) {
/* Item number is too big or too small */
reiserfs_log(LOG_WARNING, "nr_item seems wrong\n");
return (0);
}
ih = (struct item_head *)(buf + BLKH_SIZE) + nr - 1;
used_space = BLKH_SIZE + IH_SIZE * nr + (blocksize - ih_location(ih));
if (used_space != blocksize - blkh_free_space(blkh)) {
/*
* Free space does not match to calculated amount of
* use space
*/
reiserfs_log(LOG_WARNING, "free space seems wrong\n");
return (0);
}
/* FIXME: it is_leaf will hit performance too much - we may have
* return 1 here */
/* Check tables of item heads */
ih = (struct item_head *)(buf + BLKH_SIZE);
prev_location = blocksize;
for (i = 0; i < nr; i++, ih++) {
if (le_ih_k_type(ih) == TYPE_ANY) {
reiserfs_log(LOG_WARNING,
"wrong item type for item\n");
return (0);
}
if (ih_location(ih) >= blocksize ||
ih_location(ih) < IH_SIZE * nr) {
reiserfs_log(LOG_WARNING,
"item location seems wrong\n");
return (0);
}
if (ih_item_len(ih) < 1 ||
ih_item_len(ih) > MAX_ITEM_LEN(blocksize)) {
reiserfs_log(LOG_WARNING, "item length seems wrong\n");
return (0);
}
if (prev_location - ih_location(ih) != ih_item_len(ih)) {
reiserfs_log(LOG_WARNING,
"item location seems wrong (second one)\n");
return (0);
}
prev_location = ih_location(ih);
}
/* One may imagine much more checks */
return 1;
}
/* copy cpy_num node pointers and cpy_num - 1 items from buffer src to buffer dest
* last_first == FIRST_TO_LAST means, that we copy first items from src to tail of dest
* last_first == LAST_TO_FIRST means, that we copy last items from src to head of dest
*/
static void internal_copy_pointers_items(struct buffer_info *dest_bi,
struct buffer_head *src,
int last_first, int cpy_num)
{
/* ATTENTION! Number of node pointers in DEST is equal to number of items in DEST *
* as delimiting key have already inserted to buffer dest.*/
struct buffer_head *dest = dest_bi->bi_bh;
int nr_dest, nr_src;
int dest_order, src_order;
struct block_head *blkh;
struct reiserfs_key *key;
struct disk_child *dc;
nr_src = B_NR_ITEMS(src);
RFALSE(dest == NULL || src == NULL,
"src (%p) or dest (%p) buffer is 0", src, dest);
RFALSE(last_first != FIRST_TO_LAST && last_first != LAST_TO_FIRST,
"invalid last_first parameter (%d)", last_first);
RFALSE(nr_src < cpy_num - 1,
"no so many items (%d) in src (%d)", cpy_num, nr_src);
RFALSE(cpy_num < 0, "cpy_num less than 0 (%d)", cpy_num);
RFALSE(cpy_num - 1 + B_NR_ITEMS(dest) > (int)MAX_NR_KEY(dest),
"cpy_num (%d) + item number in dest (%d) can not be > MAX_NR_KEY(%d)",
cpy_num, B_NR_ITEMS(dest), MAX_NR_KEY(dest));
if (cpy_num == 0)
return;
/* coping */
blkh = B_BLK_HEAD(dest);
nr_dest = blkh_nr_item(blkh);
/*dest_order = (last_first == LAST_TO_FIRST) ? 0 : nr_dest; */
/*src_order = (last_first == LAST_TO_FIRST) ? (nr_src - cpy_num + 1) : 0; */
(last_first == LAST_TO_FIRST) ? (dest_order = 0, src_order =
nr_src - cpy_num + 1) : (dest_order =
nr_dest,
src_order =
0);
/* prepare space for cpy_num pointers */
dc = B_N_CHILD(dest, dest_order);
memmove(dc + cpy_num, dc, (nr_dest - dest_order) * DC_SIZE);
/* insert pointers */
memcpy(dc, B_N_CHILD(src, src_order), DC_SIZE * cpy_num);
/* prepare space for cpy_num - 1 item headers */
key = B_N_PDELIM_KEY(dest, dest_order);
memmove(key + cpy_num - 1, key,
KEY_SIZE * (nr_dest - dest_order) + DC_SIZE * (nr_dest +
cpy_num));
/* insert headers */
memcpy(key, B_N_PDELIM_KEY(src, src_order), KEY_SIZE * (cpy_num - 1));
/* sizes, item number */
set_blkh_nr_item(blkh, blkh_nr_item(blkh) + (cpy_num - 1));
set_blkh_free_space(blkh,
blkh_free_space(blkh) - (KEY_SIZE * (cpy_num - 1) +
DC_SIZE * cpy_num));
do_balance_mark_internal_dirty(dest_bi->tb, dest, 0);
/*&&&&&&&&&&&&&&&&&&&&&&&& */
check_internal(dest);
/*&&&&&&&&&&&&&&&&&&&&&&&& */
if (dest_bi->bi_parent) {
struct disk_child *t_dc;
t_dc = B_N_CHILD(dest_bi->bi_parent, dest_bi->bi_position);
put_dc_size(t_dc,
dc_size(t_dc) + (KEY_SIZE * (cpy_num - 1) +
DC_SIZE * cpy_num));
do_balance_mark_internal_dirty(dest_bi->tb, dest_bi->bi_parent,
0);
/*&&&&&&&&&&&&&&&&&&&&&&&& */
check_internal(dest_bi->bi_parent);
/*&&&&&&&&&&&&&&&&&&&&&&&& */
}
}
/* Delete del_num items and node pointers from buffer cur starting from *
* the first_i'th item and first_p'th pointers respectively. */
static void internal_delete_pointers_items(struct buffer_info *cur_bi,
int first_p,
int first_i, int del_num)
{
struct buffer_head *cur = cur_bi->bi_bh;
int nr;
struct block_head *blkh;
struct reiserfs_key *key;
struct disk_child *dc;
RFALSE(cur == NULL, "buffer is 0");
RFALSE(del_num < 0,
"negative number of items (%d) can not be deleted", del_num);
RFALSE(first_p < 0 || first_p + del_num > B_NR_ITEMS(cur) + 1
|| first_i < 0,
"first pointer order (%d) < 0 or "
"no so many pointers (%d), only (%d) or "
"first key order %d < 0", first_p, first_p + del_num,
B_NR_ITEMS(cur) + 1, first_i);
if (del_num == 0)
return;
blkh = B_BLK_HEAD(cur);
nr = blkh_nr_item(blkh);
if (first_p == 0 && del_num == nr + 1) {
RFALSE(first_i != 0,
"1st deleted key must have order 0, not %d", first_i);
make_empty_node(cur_bi);
return;
}
RFALSE(first_i + del_num > B_NR_ITEMS(cur),
"first_i = %d del_num = %d "
"no so many keys (%d) in the node (%b)(%z)",
first_i, del_num, first_i + del_num, cur, cur);
/* deleting */
dc = B_N_CHILD(cur, first_p);
memmove(dc, dc + del_num, (nr + 1 - first_p - del_num) * DC_SIZE);
key = B_N_PDELIM_KEY(cur, first_i);
memmove(key, key + del_num,
(nr - first_i - del_num) * KEY_SIZE + (nr + 1 -
del_num) * DC_SIZE);
/* sizes, item number */
set_blkh_nr_item(blkh, blkh_nr_item(blkh) - del_num);
set_blkh_free_space(blkh,
blkh_free_space(blkh) +
(del_num * (KEY_SIZE + DC_SIZE)));
do_balance_mark_internal_dirty(cur_bi->tb, cur, 0);
/*&&&&&&&&&&&&&&&&&&&&&&& */
check_internal(cur);
/*&&&&&&&&&&&&&&&&&&&&&&& */
if (cur_bi->bi_parent) {
struct disk_child *t_dc;
t_dc = B_N_CHILD(cur_bi->bi_parent, cur_bi->bi_position);
put_dc_size(t_dc,
dc_size(t_dc) - (del_num * (KEY_SIZE + DC_SIZE)));
do_balance_mark_internal_dirty(cur_bi->tb, cur_bi->bi_parent,
0);
/*&&&&&&&&&&&&&&&&&&&&&&&& */
check_internal(cur_bi->bi_parent);
/*&&&&&&&&&&&&&&&&&&&&&&&& */
}
}
/* Insert count node pointers into buffer cur before position to + 1.
* Insert count items into buffer cur before position to.
* Items and node pointers are specified by inserted and bh respectively.
*/
static void internal_insert_childs(struct buffer_info *cur_bi,
int to, int count,
struct item_head *inserted,
struct buffer_head **bh)
{
struct buffer_head *cur = cur_bi->bi_bh;
struct block_head *blkh;
int nr;
struct reiserfs_key *ih;
struct disk_child new_dc[2];
struct disk_child *dc;
int i;
if (count <= 0)
return;
blkh = B_BLK_HEAD(cur);
nr = blkh_nr_item(blkh);
RFALSE(count > 2, "too many children (%d) are to be inserted", count);
RFALSE(B_FREE_SPACE(cur) < count * (KEY_SIZE + DC_SIZE),
"no enough free space (%d), needed %d bytes",
B_FREE_SPACE(cur), count * (KEY_SIZE + DC_SIZE));
/* prepare space for count disk_child */
dc = B_N_CHILD(cur, to + 1);
memmove(dc + count, dc, (nr + 1 - (to + 1)) * DC_SIZE);
/* copy to_be_insert disk children */
for (i = 0; i < count; i++) {
put_dc_size(&(new_dc[i]),
MAX_CHILD_SIZE(bh[i]) - B_FREE_SPACE(bh[i]));
put_dc_block_number(&(new_dc[i]), bh[i]->b_blocknr);
}
memcpy(dc, new_dc, DC_SIZE * count);
/* prepare space for count items */
ih = B_N_PDELIM_KEY(cur, ((to == -1) ? 0 : to));
memmove(ih + count, ih,
(nr - to) * KEY_SIZE + (nr + 1 + count) * DC_SIZE);
/* copy item headers (keys) */
memcpy(ih, inserted, KEY_SIZE);
if (count > 1)
memcpy(ih + 1, inserted + 1, KEY_SIZE);
/* sizes, item number */
set_blkh_nr_item(blkh, blkh_nr_item(blkh) + count);
set_blkh_free_space(blkh,
blkh_free_space(blkh) - count * (DC_SIZE +
KEY_SIZE));
do_balance_mark_internal_dirty(cur_bi->tb, cur, 0);
/*&&&&&&&&&&&&&&&&&&&&&&&& */
check_internal(cur);
/*&&&&&&&&&&&&&&&&&&&&&&&& */
if (cur_bi->bi_parent) {
struct disk_child *t_dc =
B_N_CHILD(cur_bi->bi_parent, cur_bi->bi_position);
put_dc_size(t_dc,
dc_size(t_dc) + (count * (DC_SIZE + KEY_SIZE)));
do_balance_mark_internal_dirty(cur_bi->tb, cur_bi->bi_parent,
0);
/*&&&&&&&&&&&&&&&&&&&&&&&& */
check_internal(cur_bi->bi_parent);
/*&&&&&&&&&&&&&&&&&&&&&&&& */
}
}
static int is_leaf(char *buf, int blocksize, struct buffer_head *bh)
{
struct block_head *blkh;
struct item_head *ih;
int used_space;
int prev_location;
int i;
int nr;
blkh = (struct block_head *)buf;
if (blkh_level(blkh) != DISK_LEAF_NODE_LEVEL) {
reiserfs_warning(NULL, "reiserfs-5080",
"this should be caught earlier");
return 0;
}
nr = blkh_nr_item(blkh);
if (nr < 1 || nr > ((blocksize - BLKH_SIZE) / (IH_SIZE + MIN_ITEM_LEN))) {
/* item number is too big or too small */
reiserfs_warning(NULL, "reiserfs-5081",
"nr_item seems wrong: %z", bh);
return 0;
}
ih = (struct item_head *)(buf + BLKH_SIZE) + nr - 1;
used_space = BLKH_SIZE + IH_SIZE * nr + (blocksize - ih_location(ih));
if (used_space != blocksize - blkh_free_space(blkh)) {
/* free space does not match to calculated amount of use space */
reiserfs_warning(NULL, "reiserfs-5082",
"free space seems wrong: %z", bh);
return 0;
}
// return 1 here
/* check tables of item heads */
ih = (struct item_head *)(buf + BLKH_SIZE);
prev_location = blocksize;
for (i = 0; i < nr; i++, ih++) {
if (le_ih_k_type(ih) == TYPE_ANY) {
reiserfs_warning(NULL, "reiserfs-5083",
"wrong item type for item %h",
ih);
return 0;
}
if (ih_location(ih) >= blocksize
|| ih_location(ih) < IH_SIZE * nr) {
reiserfs_warning(NULL, "reiserfs-5084",
"item location seems wrong: %h",
ih);
return 0;
}
if (ih_item_len(ih) < 1
|| ih_item_len(ih) > MAX_ITEM_LEN(blocksize)) {
reiserfs_warning(NULL, "reiserfs-5085",
"item length seems wrong: %h",
ih);
return 0;
}
if (prev_location - ih_location(ih) != ih_item_len(ih)) {
reiserfs_warning(NULL, "reiserfs-5086",
"item location seems wrong "
"(second one): %h", ih);
return 0;
}
prev_location = ih_location(ih);
}
// one may imagine much more checks
return 1;
}
/* preconditions: reiserfs_read_super already executed, therefore
* INFO block is valid
* returns: 0 if error (errnum is set),
* nonzero iff we were able to find the key successfully.
* postconditions: on a nonzero return, the current_ih and
* current_item fields describe the key that equals the
* searched key. INFO->next_key contains the next key after
* the searched key.
* side effects: messes around with the cache.
*/
static int
search_stat( __u32 dir_id, __u32 objectid )
{
char *cache;
int depth;
int nr_item;
int i;
struct item_head *ih;
errnum = 0;
DEBUG_F( "search_stat:\n key %u:%u:0:0\n", le32_to_cpu(dir_id),
le32_to_cpu(objectid) );
depth = INFO->tree_depth;
cache = ROOT;
DEBUG_F( "depth = %d\n", depth );
while ( depth > BLKH_LEVEL_LEAF )
{
struct key *key;
nr_item = blkh_nr_item(BLOCKHEAD( cache ));
key = KEY( cache );
for ( i = 0; i < nr_item; i++ )
{
if (le32_to_cpu(key->k_dir_id) > le32_to_cpu(dir_id)
|| (key->k_dir_id == dir_id
&& (le32_to_cpu(key->k_objectid) > le32_to_cpu(objectid)
|| (key->k_objectid == objectid
&& (key->u.k_offset_v1.k_offset
| key->u.k_offset_v1.k_uniqueness) > 0))))
break;
key++;
}
DEBUG_F( " depth=%d, i=%d/%d\n", depth, i, nr_item );
INFO->next_key_nr[depth] = ( i == nr_item ) ? 0 : i + 1;
cache = read_tree_node( dc_block_number(&(DC(cache)[i])), --depth );
if ( !cache )
return 0;
}
/* cache == LEAF */
nr_item = blkh_nr_item(BLOCKHEAD(LEAF));
ih = ITEMHEAD;
DEBUG_F( "nr_item = %d\n", nr_item );
for ( i = 0; i < nr_item; i++ )
{
if ( ih->ih_key.k_dir_id == dir_id
&& ih->ih_key.k_objectid == objectid
&& ih->ih_key.u.k_offset_v1.k_offset == 0
&& ih->ih_key.u.k_offset_v1.k_uniqueness == 0 )
{
DEBUG_F( " depth=%d, i=%d/%d\n", depth, i, nr_item );
INFO->current_ih = ih;
INFO->current_item = &LEAF[ih_location(ih)];
return 1;
}
ih++;
}
DEBUG_LEAVE(FILE_ERR_BAD_FSYS);
errnum = FILE_ERR_BAD_FSYS;
return 0;
}
/* Get the next key, i.e. the key following the last retrieved key in
* tree order. INFO->current_ih and
* INFO->current_info are adapted accordingly. */
static int
next_key( void )
{
__u16 depth;
struct item_head *ih = INFO->current_ih + 1;
char *cache;
DEBUG_F( "next_key:\n old ih: key %u:%u:%u:%u version:%u\n",
le32_to_cpu(INFO->current_ih->ih_key.k_dir_id),
le32_to_cpu(INFO->current_ih->ih_key.k_objectid),
le32_to_cpu(INFO->current_ih->ih_key.u.k_offset_v1.k_offset),
le32_to_cpu(INFO->current_ih->ih_key.u.k_offset_v1.k_uniqueness),
ih_version(INFO->current_ih) );
if ( ih == &ITEMHEAD[blkh_nr_item(BLOCKHEAD( LEAF ))] )
{
depth = BLKH_LEVEL_LEAF;
/* The last item, was the last in the leaf node. * Read in the next
* * block */
do
{
if ( depth == INFO->tree_depth )
{
/* There are no more keys at all. * Return a dummy item with
* * MAX_KEY */
ih =
( struct item_head * )
&BLOCKHEAD( LEAF )->blk_right_delim_key;
goto found;
}
depth++;
DEBUG_F( " depth=%u, i=%u\n", depth, INFO->next_key_nr[depth] );
}
while ( INFO->next_key_nr[depth] == 0 );
if ( depth == INFO->tree_depth )
cache = ROOT;
else if ( depth <= INFO->cached_slots )
cache = CACHE( depth );
else
{
cache = read_tree_node( INFO->blocks[depth], --depth );
if ( !cache )
return 0;
}
do
{
__u16 nr_item = blkh_nr_item(BLOCKHEAD( cache ));
int key_nr = INFO->next_key_nr[depth]++;
DEBUG_F( " depth=%u, i=%u/%u\n", depth, key_nr, nr_item );
if ( key_nr == nr_item )
/* This is the last item in this block, set the next_key_nr *
* to 0 */
INFO->next_key_nr[depth] = 0;
cache =
read_tree_node( dc_block_number( &(DC( cache )[key_nr])),
--depth );
if ( !cache )
return 0;
}
while ( depth > BLKH_LEVEL_LEAF );
ih = ITEMHEAD;
}
found:
INFO->current_ih = ih;
INFO->current_item = &LEAF[ih_location(ih)];
DEBUG_F( " new ih: key %u:%u:%u:%u version:%u\n",
le32_to_cpu(INFO->current_ih->ih_key.k_dir_id),
le32_to_cpu(INFO->current_ih->ih_key.k_objectid),
le32_to_cpu(INFO->current_ih->ih_key.u.k_offset_v1.k_offset),
le32_to_cpu(INFO->current_ih->ih_key.u.k_offset_v1.k_uniqueness),
ih_version(INFO->current_ih) );
return 1;
}