/* Insert d_key'th (delimiting) key from buffer cfr to head of dest.
* Copy n node pointers and n - 1 items from buffer src to buffer dest.
* Replace d_key'th key in buffer cfr.
* Delete n items and node pointers from buffer src.
*/
static void internal_shift_right(int mode, /* INTERNAL_FROM_S_TO_R | INTERNAL_FROM_L_TO_S */
struct tree_balance *tb,
int h, int pointer_amount)
{
struct buffer_info dest_bi, src_bi;
struct buffer_head *cf;
int d_key_position;
int nr;
internal_define_dest_src_infos(mode, tb, h, &dest_bi, &src_bi,
&d_key_position, &cf);
nr = B_NR_ITEMS(src_bi.bi_bh);
if (pointer_amount > 0) {
/* insert delimiting key from common father of dest and src to dest node into position 0 */
internal_insert_key(&dest_bi, 0, cf, d_key_position);
if (nr == pointer_amount - 1) {
RFALSE(src_bi.bi_bh != PATH_H_PBUFFER(tb->tb_path, h) /*tb->S[h] */ ||
dest_bi.bi_bh != tb->R[h],
"src (%p) must be == tb->S[h](%p) when it disappears",
src_bi.bi_bh, PATH_H_PBUFFER(tb->tb_path, h));
/* when S[h] disappers replace left delemiting key as well */
if (tb->CFL[h])
replace_key(tb, cf, d_key_position, tb->CFL[h],
tb->lkey[h]);
} else
replace_key(tb, cf, d_key_position, src_bi.bi_bh,
nr - pointer_amount);
}
/* last parameter is del_parameter */
internal_move_pointers_items(&dest_bi, &src_bi, LAST_TO_FIRST,
pointer_amount, 0);
}
void print_path (struct tree_balance * tb, struct path * path)
{
int h = 0;
struct buffer_head * bh;
if (tb) {
while (tb->insert_size[h]) {
bh = PATH_H_PBUFFER (path, h);
printk ("block %lu (level=%d), position %d\n", bh ? bh->b_blocknr : 0,
bh ? B_LEVEL (bh) : 0, PATH_H_POSITION (path, h));
h ++;
}
} else {
int offset = path->path_length;
struct buffer_head * bh;
printk ("Offset Bh (b_blocknr, b_count) Position Nr_item\n");
while ( offset > ILLEGAL_PATH_ELEMENT_OFFSET ) {
bh = PATH_OFFSET_PBUFFER (path, offset);
printk ("%6d %10p (%9lu, %7d) %8d %7d\n", offset,
bh, bh ? bh->b_blocknr : 0, bh ? atomic_read (&(bh->b_count)) : 0,
PATH_OFFSET_POSITION (path, offset), bh ? B_NR_ITEMS (bh) : -1);
offset --;
}
}
}
/* Replace delimiting key of buffers L[h] and S[h] by the given key.*/
static void replace_lkey(struct tree_balance *tb, int h, struct item_head *key)
{
RFALSE(tb->L[h] == NULL || tb->CFL[h] == NULL,
"L[h](%p) and CFL[h](%p) must exist in replace_lkey",
tb->L[h], tb->CFL[h]);
if (B_NR_ITEMS(PATH_H_PBUFFER(tb->tb_path, h)) == 0)
return;
memcpy(B_N_PDELIM_KEY(tb->CFL[h], tb->lkey[h]), key, KEY_SIZE);
do_balance_mark_internal_dirty(tb, tb->CFL[h], 0);
}
/* this stores initial state of tree balance in the print_tb_buf */
void store_print_tb(struct tree_balance *tb)
{
int h = 0;
int i;
struct buffer_head *tbSh, *tbFh;
if (!tb)
return;
sprintf(print_tb_buf, "\n"
"BALANCING %d\n"
"MODE=%c, ITEM_POS=%d POS_IN_ITEM=%d\n"
"=====================================================================\n"
"* h * S * L * R * F * FL * FR * CFL * CFR *\n",
REISERFS_SB(tb->tb_sb)->s_do_balance,
tb->tb_mode, PATH_LAST_POSITION(tb->tb_path),
tb->tb_path->pos_in_item);
for (h = 0; h < ARRAY_SIZE(tb->insert_size); h++) {
if (PATH_H_PATH_OFFSET(tb->tb_path, h) <=
tb->tb_path->path_length
&& PATH_H_PATH_OFFSET(tb->tb_path,
h) > ILLEGAL_PATH_ELEMENT_OFFSET) {
tbSh = PATH_H_PBUFFER(tb->tb_path, h);
tbFh = PATH_H_PPARENT(tb->tb_path, h);
} else {
tbSh = NULL;
tbFh = NULL;
}
sprintf(print_tb_buf + strlen(print_tb_buf),
"* %d * %3lld(%2d) * %3lld(%2d) * %3lld(%2d) * %5lld * %5lld * %5lld * %5lld * %5lld *\n",
h,
(tbSh) ? (long long)(tbSh->b_blocknr) : (-1LL),
(tbSh) ? atomic_read(&(tbSh->b_count)) : -1,
(tb->L[h]) ? (long long)(tb->L[h]->b_blocknr) : (-1LL),
(tb->L[h]) ? atomic_read(&(tb->L[h]->b_count)) : -1,
(tb->R[h]) ? (long long)(tb->R[h]->b_blocknr) : (-1LL),
(tb->R[h]) ? atomic_read(&(tb->R[h]->b_count)) : -1,
(tbFh) ? (long long)(tbFh->b_blocknr) : (-1LL),
(tb->FL[h]) ? (long long)(tb->FL[h]->
b_blocknr) : (-1LL),
(tb->FR[h]) ? (long long)(tb->FR[h]->
b_blocknr) : (-1LL),
(tb->CFL[h]) ? (long long)(tb->CFL[h]->
b_blocknr) : (-1LL),
(tb->CFR[h]) ? (long long)(tb->CFR[h]->
b_blocknr) : (-1LL));
}
sprintf(print_tb_buf + strlen(print_tb_buf),
"=====================================================================\n"
"* h * size * ln * lb * rn * rb * blkn * s0 * s1 * s1b * s2 * s2b * curb * lk * rk *\n"
"* 0 * %4d * %2d * %2d * %2d * %2d * %4d * %2d * %2d * %3d * %2d * %3d * %4d * %2d * %2d *\n",
tb->insert_size[0], tb->lnum[0], tb->lbytes, tb->rnum[0],
tb->rbytes, tb->blknum[0], tb->s0num, tb->s1num, tb->s1bytes,
tb->s2num, tb->s2bytes, tb->cur_blknum, tb->lkey[0],
tb->rkey[0]);
/* this prints balance parameters for non-leaf levels */
h = 0;
do {
h++;
sprintf(print_tb_buf + strlen(print_tb_buf),
"* %d * %4d * %2d * * %2d * * %2d *\n",
h, tb->insert_size[h], tb->lnum[h], tb->rnum[h],
tb->blknum[h]);
} while (tb->insert_size[h]);
sprintf(print_tb_buf + strlen(print_tb_buf),
"=====================================================================\n"
"FEB list: ");
/* print FEB list (list of buffers in form (bh (b_blocknr, b_count), that will be used for new nodes) */
h = 0;
for (i = 0; i < ARRAY_SIZE(tb->FEB); i++)
sprintf(print_tb_buf + strlen(print_tb_buf),
"%p (%llu %d)%s", tb->FEB[i],
tb->FEB[i] ? (unsigned long long)tb->FEB[i]->
b_blocknr : 0ULL,
tb->FEB[i] ? atomic_read(&(tb->FEB[i]->b_count)) : 0,
(i == ARRAY_SIZE(tb->FEB) - 1) ? "\n" : ", ");
sprintf(print_tb_buf + strlen(print_tb_buf),
"======================== the end ====================================\n");
}
int balance_internal(struct tree_balance *tb, /* tree_balance structure */
int h, /* level of the tree */
int child_pos, struct item_head *insert_key, /* key for insertion on higher level */
struct buffer_head **insert_ptr /* node for insertion on higher level */
)
/* if inserting/pasting
{
child_pos is the position of the node-pointer in S[h] that *
pointed to S[h-1] before balancing of the h-1 level; *
this means that new pointers and items must be inserted AFTER *
child_pos
}
else
{
it is the position of the leftmost pointer that must be deleted (together with
its corresponding key to the left of the pointer)
as a result of the previous level's balancing.
}
*/
{
struct buffer_head *tbSh = PATH_H_PBUFFER(tb->tb_path, h);
struct buffer_info bi;
int order; /* we return this: it is 0 if there is no S[h], else it is tb->S[h]->b_item_order */
int insert_num, n, k;
struct buffer_head *S_new;
struct item_head new_insert_key;
struct buffer_head *new_insert_ptr = NULL;
struct item_head *new_insert_key_addr = insert_key;
RFALSE(h < 1, "h (%d) can not be < 1 on internal level", h);
PROC_INFO_INC(tb->tb_sb, balance_at[h]);
order =
(tbSh) ? PATH_H_POSITION(tb->tb_path,
h + 1) /*tb->S[h]->b_item_order */ : 0;
/* Using insert_size[h] calculate the number insert_num of items
that must be inserted to or deleted from S[h]. */
insert_num = tb->insert_size[h] / ((int)(KEY_SIZE + DC_SIZE));
/* Check whether insert_num is proper * */
RFALSE(insert_num < -2 || insert_num > 2,
"incorrect number of items inserted to the internal node (%d)",
insert_num);
RFALSE(h > 1 && (insert_num > 1 || insert_num < -1),
"incorrect number of items (%d) inserted to the internal node on a level (h=%d) higher than last internal level",
insert_num, h);
/* Make balance in case insert_num < 0 */
if (insert_num < 0) {
balance_internal_when_delete(tb, h, child_pos);
return order;
}
k = 0;
if (tb->lnum[h] > 0) {
/* shift lnum[h] items from S[h] to the left neighbor L[h].
check how many of new items fall into L[h] or CFL[h] after
shifting */
n = B_NR_ITEMS(tb->L[h]); /* number of items in L[h] */
if (tb->lnum[h] <= child_pos) {
/* new items don't fall into L[h] or CFL[h] */
internal_shift_left(INTERNAL_SHIFT_FROM_S_TO_L, tb, h,
tb->lnum[h]);
/*internal_shift_left (tb->L[h],tb->CFL[h],tb->lkey[h],tbSh,tb->lnum[h]); */
child_pos -= tb->lnum[h];
} else if (tb->lnum[h] > child_pos + insert_num) {
/* all new items fall into L[h] */
internal_shift_left(INTERNAL_SHIFT_FROM_S_TO_L, tb, h,
tb->lnum[h] - insert_num);
/* internal_shift_left(tb->L[h],tb->CFL[h],tb->lkey[h],tbSh,
tb->lnum[h]-insert_num);
*/
/* insert insert_num keys and node-pointers into L[h] */
bi.tb = tb;
bi.bi_bh = tb->L[h];
bi.bi_parent = tb->FL[h];
bi.bi_position = get_left_neighbor_position(tb, h);
internal_insert_childs(&bi,
/*tb->L[h], tb->S[h-1]->b_next */
n + child_pos + 1,
insert_num, insert_key,
insert_ptr);
insert_num = 0;
} else {
struct disk_child *dc;
/* some items fall into L[h] or CFL[h], but some don't fall */
internal_shift1_left(tb, h, child_pos + 1);
/* calculate number of new items that fall into L[h] */
k = tb->lnum[h] - child_pos - 1;
bi.tb = tb;
bi.bi_bh = tb->L[h];
bi.bi_parent = tb->FL[h];
bi.bi_position = get_left_neighbor_position(tb, h);
internal_insert_childs(&bi,
/*tb->L[h], tb->S[h-1]->b_next, */
n + child_pos + 1, k,
insert_key, insert_ptr);
replace_lkey(tb, h, insert_key + k);
/* replace the first node-ptr in S[h] by node-ptr to insert_ptr[k] */
dc = B_N_CHILD(tbSh, 0);
put_dc_size(dc,
MAX_CHILD_SIZE(insert_ptr[k]) -
B_FREE_SPACE(insert_ptr[k]));
put_dc_block_number(dc, insert_ptr[k]->b_blocknr);
do_balance_mark_internal_dirty(tb, tbSh, 0);
k++;
insert_key += k;
insert_ptr += k;
insert_num -= k;
child_pos = 0;
}
}
/* tb->lnum[h] > 0 */
if (tb->rnum[h] > 0) {
/*shift rnum[h] items from S[h] to the right neighbor R[h] */
/* check how many of new items fall into R or CFR after shifting */
n = B_NR_ITEMS(tbSh); /* number of items in S[h] */
if (n - tb->rnum[h] >= child_pos)
/* new items fall into S[h] */
/*internal_shift_right(tb,h,tbSh,tb->CFR[h],tb->rkey[h],tb->R[h],tb->rnum[h]); */
internal_shift_right(INTERNAL_SHIFT_FROM_S_TO_R, tb, h,
tb->rnum[h]);
else if (n + insert_num - tb->rnum[h] < child_pos) {
/* all new items fall into R[h] */
/*internal_shift_right(tb,h,tbSh,tb->CFR[h],tb->rkey[h],tb->R[h],
tb->rnum[h] - insert_num); */
internal_shift_right(INTERNAL_SHIFT_FROM_S_TO_R, tb, h,
tb->rnum[h] - insert_num);
/* insert insert_num keys and node-pointers into R[h] */
bi.tb = tb;
bi.bi_bh = tb->R[h];
bi.bi_parent = tb->FR[h];
bi.bi_position = get_right_neighbor_position(tb, h);
internal_insert_childs(&bi,
/*tb->R[h],tb->S[h-1]->b_next */
child_pos - n - insert_num +
tb->rnum[h] - 1,
insert_num, insert_key,
insert_ptr);
insert_num = 0;
} else {
struct disk_child *dc;
/* one of the items falls into CFR[h] */
internal_shift1_right(tb, h, n - child_pos + 1);
/* calculate number of new items that fall into R[h] */
k = tb->rnum[h] - n + child_pos - 1;
bi.tb = tb;
bi.bi_bh = tb->R[h];
bi.bi_parent = tb->FR[h];
bi.bi_position = get_right_neighbor_position(tb, h);
internal_insert_childs(&bi,
/*tb->R[h], tb->R[h]->b_child, */
0, k, insert_key + 1,
insert_ptr + 1);
replace_rkey(tb, h, insert_key + insert_num - k - 1);
/* replace the first node-ptr in R[h] by node-ptr insert_ptr[insert_num-k-1] */
dc = B_N_CHILD(tb->R[h], 0);
put_dc_size(dc,
MAX_CHILD_SIZE(insert_ptr
[insert_num - k - 1]) -
B_FREE_SPACE(insert_ptr
[insert_num - k - 1]));
put_dc_block_number(dc,
insert_ptr[insert_num - k -
1]->b_blocknr);
do_balance_mark_internal_dirty(tb, tb->R[h], 0);
insert_num -= (k + 1);
}
}
/** Fill new node that appears instead of S[h] **/
RFALSE(tb->blknum[h] > 2, "blknum can not be > 2 for internal level");
RFALSE(tb->blknum[h] < 0, "blknum can not be < 0");
if (!tb->blknum[h]) { /* node S[h] is empty now */
RFALSE(!tbSh, "S[h] is equal NULL");
/* do what is needed for buffer thrown from tree */
reiserfs_invalidate_buffer(tb, tbSh);
return order;
}
if (!tbSh) {
/* create new root */
struct disk_child *dc;
struct buffer_head *tbSh_1 = PATH_H_PBUFFER(tb->tb_path, h - 1);
struct block_head *blkh;
if (tb->blknum[h] != 1)
reiserfs_panic(NULL, "ibalance-3", "One new node "
"required for creating the new root");
/* S[h] = empty buffer from the list FEB. */
tbSh = get_FEB(tb);
blkh = B_BLK_HEAD(tbSh);
set_blkh_level(blkh, h + 1);
/* Put the unique node-pointer to S[h] that points to S[h-1]. */
dc = B_N_CHILD(tbSh, 0);
put_dc_block_number(dc, tbSh_1->b_blocknr);
put_dc_size(dc,
(MAX_CHILD_SIZE(tbSh_1) - B_FREE_SPACE(tbSh_1)));
tb->insert_size[h] -= DC_SIZE;
set_blkh_free_space(blkh, blkh_free_space(blkh) - DC_SIZE);
do_balance_mark_internal_dirty(tb, tbSh, 0);
/*&&&&&&&&&&&&&&&&&&&&&&&& */
check_internal(tbSh);
/*&&&&&&&&&&&&&&&&&&&&&&&& */
/* put new root into path structure */
PATH_OFFSET_PBUFFER(tb->tb_path, ILLEGAL_PATH_ELEMENT_OFFSET) =
tbSh;
/* Change root in structure super block. */
PUT_SB_ROOT_BLOCK(tb->tb_sb, tbSh->b_blocknr);
PUT_SB_TREE_HEIGHT(tb->tb_sb, SB_TREE_HEIGHT(tb->tb_sb) + 1);
do_balance_mark_sb_dirty(tb, REISERFS_SB(tb->tb_sb)->s_sbh, 1);
}
if (tb->blknum[h] == 2) {
int snum;
struct buffer_info dest_bi, src_bi;
/* S_new = free buffer from list FEB */
S_new = get_FEB(tb);
set_blkh_level(B_BLK_HEAD(S_new), h + 1);
dest_bi.tb = tb;
dest_bi.bi_bh = S_new;
dest_bi.bi_parent = NULL;
dest_bi.bi_position = 0;
src_bi.tb = tb;
src_bi.bi_bh = tbSh;
src_bi.bi_parent = PATH_H_PPARENT(tb->tb_path, h);
src_bi.bi_position = PATH_H_POSITION(tb->tb_path, h + 1);
n = B_NR_ITEMS(tbSh); /* number of items in S[h] */
snum = (insert_num + n + 1) / 2;
if (n - snum >= child_pos) {
/* new items don't fall into S_new */
/* store the delimiting key for the next level */
/* new_insert_key = (n - snum)'th key in S[h] */
memcpy(&new_insert_key, B_N_PDELIM_KEY(tbSh, n - snum),
KEY_SIZE);
/* last parameter is del_par */
internal_move_pointers_items(&dest_bi, &src_bi,
LAST_TO_FIRST, snum, 0);
/* internal_move_pointers_items(S_new, tbSh, LAST_TO_FIRST, snum, 0); */
} else if (n + insert_num - snum < child_pos) {
/* all new items fall into S_new */
/* store the delimiting key for the next level */
/* new_insert_key = (n + insert_item - snum)'th key in S[h] */
memcpy(&new_insert_key,
B_N_PDELIM_KEY(tbSh, n + insert_num - snum),
KEY_SIZE);
/* last parameter is del_par */
internal_move_pointers_items(&dest_bi, &src_bi,
LAST_TO_FIRST,
snum - insert_num, 0);
/* internal_move_pointers_items(S_new,tbSh,1,snum - insert_num,0); */
/* insert insert_num keys and node-pointers into S_new */
internal_insert_childs(&dest_bi,
/*S_new,tb->S[h-1]->b_next, */
child_pos - n - insert_num +
snum - 1,
insert_num, insert_key,
insert_ptr);
insert_num = 0;
} else {
struct disk_child *dc;
/* some items fall into S_new, but some don't fall */
/* last parameter is del_par */
internal_move_pointers_items(&dest_bi, &src_bi,
LAST_TO_FIRST,
n - child_pos + 1, 1);
/* internal_move_pointers_items(S_new,tbSh,1,n - child_pos + 1,1); */
/* calculate number of new items that fall into S_new */
k = snum - n + child_pos - 1;
internal_insert_childs(&dest_bi, /*S_new, */ 0, k,
insert_key + 1, insert_ptr + 1);
/* new_insert_key = insert_key[insert_num - k - 1] */
memcpy(&new_insert_key, insert_key + insert_num - k - 1,
KEY_SIZE);
/* replace first node-ptr in S_new by node-ptr to insert_ptr[insert_num-k-1] */
dc = B_N_CHILD(S_new, 0);
put_dc_size(dc,
(MAX_CHILD_SIZE
(insert_ptr[insert_num - k - 1]) -
B_FREE_SPACE(insert_ptr
[insert_num - k - 1])));
put_dc_block_number(dc,
insert_ptr[insert_num - k -
1]->b_blocknr);
do_balance_mark_internal_dirty(tb, S_new, 0);
insert_num -= (k + 1);
}
/* new_insert_ptr = node_pointer to S_new */
new_insert_ptr = S_new;
RFALSE(!buffer_journaled(S_new) || buffer_journal_dirty(S_new)
|| buffer_dirty(S_new), "cm-00001: bad S_new (%b)",
S_new);
// S_new is released in unfix_nodes
}
n = B_NR_ITEMS(tbSh); /*number of items in S[h] */
if (0 <= child_pos && child_pos <= n && insert_num > 0) {
bi.tb = tb;
bi.bi_bh = tbSh;
bi.bi_parent = PATH_H_PPARENT(tb->tb_path, h);
bi.bi_position = PATH_H_POSITION(tb->tb_path, h + 1);
internal_insert_childs(&bi, /*tbSh, */
/* ( tb->S[h-1]->b_parent == tb->S[h] ) ? tb->S[h-1]->b_next : tb->S[h]->b_child->b_next, */
child_pos, insert_num, insert_key,
insert_ptr);
}
memcpy(new_insert_key_addr, &new_insert_key, KEY_SIZE);
insert_ptr[0] = new_insert_ptr;
return order;
}
/* Delete insert_num node pointers together with their left items
* and balance current node.*/
static void balance_internal_when_delete(struct tree_balance *tb,
int h, int child_pos)
{
int insert_num;
int n;
struct buffer_head *tbSh = PATH_H_PBUFFER(tb->tb_path, h);
struct buffer_info bi;
insert_num = tb->insert_size[h] / ((int)(DC_SIZE + KEY_SIZE));
/* delete child-node-pointer(s) together with their left item(s) */
bi.tb = tb;
bi.bi_bh = tbSh;
bi.bi_parent = PATH_H_PPARENT(tb->tb_path, h);
bi.bi_position = PATH_H_POSITION(tb->tb_path, h + 1);
internal_delete_childs(&bi, child_pos, -insert_num);
RFALSE(tb->blknum[h] > 1,
"tb->blknum[%d]=%d when insert_size < 0", h, tb->blknum[h]);
n = B_NR_ITEMS(tbSh);
if (tb->lnum[h] == 0 && tb->rnum[h] == 0) {
if (tb->blknum[h] == 0) {
/* node S[h] (root of the tree) is empty now */
struct buffer_head *new_root;
RFALSE(n
|| B_FREE_SPACE(tbSh) !=
MAX_CHILD_SIZE(tbSh) - DC_SIZE,
"buffer must have only 0 keys (%d)", n);
RFALSE(bi.bi_parent, "root has parent (%p)",
bi.bi_parent);
/* choose a new root */
if (!tb->L[h - 1] || !B_NR_ITEMS(tb->L[h - 1]))
new_root = tb->R[h - 1];
else
new_root = tb->L[h - 1];
/* switch super block's tree root block number to the new value */
PUT_SB_ROOT_BLOCK(tb->tb_sb, new_root->b_blocknr);
//REISERFS_SB(tb->tb_sb)->s_rs->s_tree_height --;
PUT_SB_TREE_HEIGHT(tb->tb_sb,
SB_TREE_HEIGHT(tb->tb_sb) - 1);
do_balance_mark_sb_dirty(tb,
REISERFS_SB(tb->tb_sb)->s_sbh,
1);
/*&&&&&&&&&&&&&&&&&&&&&& */
if (h > 1)
/* use check_internal if new root is an internal node */
check_internal(new_root);
/*&&&&&&&&&&&&&&&&&&&&&& */
/* do what is needed for buffer thrown from tree */
reiserfs_invalidate_buffer(tb, tbSh);
return;
}
return;
}
if (tb->L[h] && tb->lnum[h] == -B_NR_ITEMS(tb->L[h]) - 1) { /* join S[h] with L[h] */
RFALSE(tb->rnum[h] != 0,
"invalid tb->rnum[%d]==%d when joining S[h] with L[h]",
h, tb->rnum[h]);
internal_shift_left(INTERNAL_SHIFT_FROM_S_TO_L, tb, h, n + 1);
reiserfs_invalidate_buffer(tb, tbSh);
return;
}
if (tb->R[h] && tb->rnum[h] == -B_NR_ITEMS(tb->R[h]) - 1) { /* join S[h] with R[h] */
RFALSE(tb->lnum[h] != 0,
"invalid tb->lnum[%d]==%d when joining S[h] with R[h]",
h, tb->lnum[h]);
internal_shift_right(INTERNAL_SHIFT_FROM_S_TO_R, tb, h, n + 1);
reiserfs_invalidate_buffer(tb, tbSh);
return;
}
if (tb->lnum[h] < 0) { /* borrow from left neighbor L[h] */
RFALSE(tb->rnum[h] != 0,
"wrong tb->rnum[%d]==%d when borrow from L[h]", h,
tb->rnum[h]);
/*internal_shift_right (tb, h, tb->L[h], tb->CFL[h], tb->lkey[h], tb->S[h], -tb->lnum[h]); */
internal_shift_right(INTERNAL_SHIFT_FROM_L_TO_S, tb, h,
-tb->lnum[h]);
return;
}
if (tb->rnum[h] < 0) { /* borrow from right neighbor R[h] */
RFALSE(tb->lnum[h] != 0,
"invalid tb->lnum[%d]==%d when borrow from R[h]",
h, tb->lnum[h]);
internal_shift_left(INTERNAL_SHIFT_FROM_R_TO_S, tb, h, -tb->rnum[h]); /*tb->S[h], tb->CFR[h], tb->rkey[h], tb->R[h], -tb->rnum[h]); */
return;
}
if (tb->lnum[h] > 0) { /* split S[h] into two parts and put them into neighbors */
RFALSE(tb->rnum[h] == 0 || tb->lnum[h] + tb->rnum[h] != n + 1,
"invalid tb->lnum[%d]==%d or tb->rnum[%d]==%d when S[h](item number == %d) is split between them",
h, tb->lnum[h], h, tb->rnum[h], n);
internal_shift_left(INTERNAL_SHIFT_FROM_S_TO_L, tb, h, tb->lnum[h]); /*tb->L[h], tb->CFL[h], tb->lkey[h], tb->S[h], tb->lnum[h]); */
internal_shift_right(INTERNAL_SHIFT_FROM_S_TO_R, tb, h,
tb->rnum[h]);
reiserfs_invalidate_buffer(tb, tbSh);
return;
}
reiserfs_panic(tb->tb_sb, "ibalance-2",
"unexpected tb->lnum[%d]==%d or tb->rnum[%d]==%d",
h, tb->lnum[h], h, tb->rnum[h]);
}
static void internal_define_dest_src_infos(int shift_mode,
struct tree_balance *tb,
int h,
struct buffer_info *dest_bi,
struct buffer_info *src_bi,
int *d_key, struct buffer_head **cf)
{
memset(dest_bi, 0, sizeof(struct buffer_info));
memset(src_bi, 0, sizeof(struct buffer_info));
/* define dest, src, dest parent, dest position */
switch (shift_mode) {
case INTERNAL_SHIFT_FROM_S_TO_L: /* used in internal_shift_left */
src_bi->tb = tb;
src_bi->bi_bh = PATH_H_PBUFFER(tb->tb_path, h);
src_bi->bi_parent = PATH_H_PPARENT(tb->tb_path, h);
src_bi->bi_position = PATH_H_POSITION(tb->tb_path, h + 1);
dest_bi->tb = tb;
dest_bi->bi_bh = tb->L[h];
dest_bi->bi_parent = tb->FL[h];
dest_bi->bi_position = get_left_neighbor_position(tb, h);
*d_key = tb->lkey[h];
*cf = tb->CFL[h];
break;
case INTERNAL_SHIFT_FROM_L_TO_S:
src_bi->tb = tb;
src_bi->bi_bh = tb->L[h];
src_bi->bi_parent = tb->FL[h];
src_bi->bi_position = get_left_neighbor_position(tb, h);
dest_bi->tb = tb;
dest_bi->bi_bh = PATH_H_PBUFFER(tb->tb_path, h);
dest_bi->bi_parent = PATH_H_PPARENT(tb->tb_path, h);
dest_bi->bi_position = PATH_H_POSITION(tb->tb_path, h + 1); /* dest position is analog of dest->b_item_order */
*d_key = tb->lkey[h];
*cf = tb->CFL[h];
break;
case INTERNAL_SHIFT_FROM_R_TO_S: /* used in internal_shift_left */
src_bi->tb = tb;
src_bi->bi_bh = tb->R[h];
src_bi->bi_parent = tb->FR[h];
src_bi->bi_position = get_right_neighbor_position(tb, h);
dest_bi->tb = tb;
dest_bi->bi_bh = PATH_H_PBUFFER(tb->tb_path, h);
dest_bi->bi_parent = PATH_H_PPARENT(tb->tb_path, h);
dest_bi->bi_position = PATH_H_POSITION(tb->tb_path, h + 1);
*d_key = tb->rkey[h];
*cf = tb->CFR[h];
break;
case INTERNAL_SHIFT_FROM_S_TO_R:
src_bi->tb = tb;
src_bi->bi_bh = PATH_H_PBUFFER(tb->tb_path, h);
src_bi->bi_parent = PATH_H_PPARENT(tb->tb_path, h);
src_bi->bi_position = PATH_H_POSITION(tb->tb_path, h + 1);
dest_bi->tb = tb;
dest_bi->bi_bh = tb->R[h];
dest_bi->bi_parent = tb->FR[h];
dest_bi->bi_position = get_right_neighbor_position(tb, h);
*d_key = tb->rkey[h];
*cf = tb->CFR[h];
break;
case INTERNAL_INSERT_TO_L:
dest_bi->tb = tb;
dest_bi->bi_bh = tb->L[h];
dest_bi->bi_parent = tb->FL[h];
dest_bi->bi_position = get_left_neighbor_position(tb, h);
break;
case INTERNAL_INSERT_TO_S:
dest_bi->tb = tb;
dest_bi->bi_bh = PATH_H_PBUFFER(tb->tb_path, h);
dest_bi->bi_parent = PATH_H_PPARENT(tb->tb_path, h);
dest_bi->bi_position = PATH_H_POSITION(tb->tb_path, h + 1);
break;
case INTERNAL_INSERT_TO_R:
dest_bi->tb = tb;
dest_bi->bi_bh = tb->R[h];
dest_bi->bi_parent = tb->FR[h];
dest_bi->bi_position = get_right_neighbor_position(tb, h);
break;
default:
reiserfs_panic(tb->tb_sb, "ibalance-1",
"shift type is unknown (%d)",
shift_mode);
}
}
