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-rw-r--r--fs/reiserfs/ibalance.c271
1 files changed, 171 insertions, 100 deletions
diff --git a/fs/reiserfs/ibalance.c b/fs/reiserfs/ibalance.c
index e1978fd895f5..73231b1ebdbe 100644
--- a/fs/reiserfs/ibalance.c
+++ b/fs/reiserfs/ibalance.c
@@ -12,7 +12,10 @@
int balance_internal(struct tree_balance *,
int, int, struct item_head *, struct buffer_head **);
-/* modes of internal_shift_left, internal_shift_right and internal_insert_childs */
+/*
+ * modes of internal_shift_left, internal_shift_right and
+ * internal_insert_childs
+ */
#define INTERNAL_SHIFT_FROM_S_TO_L 0
#define INTERNAL_SHIFT_FROM_R_TO_S 1
#define INTERNAL_SHIFT_FROM_L_TO_S 2
@@ -32,7 +35,9 @@ static void internal_define_dest_src_infos(int shift_mode,
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 */
+
+ /* used in internal_shift_left */
+ case INTERNAL_SHIFT_FROM_S_TO_L:
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);
@@ -52,12 +57,14 @@ static void internal_define_dest_src_infos(int shift_mode,
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 */
+ /* dest position is analog of dest->b_item_order */
+ dest_bi->bi_position = PATH_H_POSITION(tb->tb_path, h + 1);
*d_key = tb->lkey[h];
*cf = tb->CFL[h];
break;
- case INTERNAL_SHIFT_FROM_R_TO_S: /* used in internal_shift_left */
+ /* used in internal_shift_left */
+ case INTERNAL_SHIFT_FROM_R_TO_S:
src_bi->tb = tb;
src_bi->bi_bh = tb->R[h];
src_bi->bi_parent = tb->FR[h];
@@ -111,7 +118,8 @@ static void internal_define_dest_src_infos(int shift_mode,
}
}
-/* Insert count node pointers into buffer cur before position to + 1.
+/*
+ * 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.
*/
@@ -146,14 +154,14 @@ static void internal_insert_childs(struct buffer_info *cur_bi,
/* copy to_be_insert disk children */
for (i = 0; i < count; i++) {
- put_dc_size(&(new_dc[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);
+ 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));
+ ih = internal_key(cur, ((to == -1) ? 0 : to));
memmove(ih + count, ih,
(nr - to) * KEY_SIZE + (nr + 1 + count) * DC_SIZE);
@@ -190,8 +198,10 @@ static void internal_insert_childs(struct buffer_info *cur_bi,
}
-/* Delete del_num items and node pointers from buffer cur starting from *
- * the first_i'th item and first_p'th pointers respectively. */
+/*
+ * 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)
@@ -233,7 +243,7 @@ static void internal_delete_pointers_items(struct buffer_info *cur_bi,
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);
+ key = internal_key(cur, first_i);
memmove(key, key + del_num,
(nr - first_i - del_num) * KEY_SIZE + (nr + 1 -
del_num) * DC_SIZE);
@@ -270,22 +280,30 @@ static void internal_delete_childs(struct buffer_info *cur_bi, int from, int n)
i_from = (from == 0) ? from : from - 1;
- /* delete n pointers starting from `from' position in CUR;
- delete n keys starting from 'i_from' position in CUR;
+ /*
+ * delete n pointers starting from `from' position in CUR;
+ * delete n keys starting from 'i_from' position in CUR;
*/
internal_delete_pointers_items(cur_bi, from, i_from, n);
}
-/* 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
+/*
+ * 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.*/
+ /*
+ * 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;
@@ -330,13 +348,13 @@ static void internal_copy_pointers_items(struct buffer_info *dest_bi,
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);
+ key = internal_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));
+ memcpy(key, internal_key(src, src_order), KEY_SIZE * (cpy_num - 1));
/* sizes, item number */
set_blkh_nr_item(blkh, blkh_nr_item(blkh) + (cpy_num - 1));
@@ -366,7 +384,9 @@ static void internal_copy_pointers_items(struct buffer_info *dest_bi,
}
-/* Copy cpy_num node pointers and cpy_num - 1 items from buffer src to buffer dest.
+/*
+ * Copy cpy_num node pointers and cpy_num - 1 items from buffer src to
+ * buffer dest.
* Delete cpy_num - del_par items and node pointers from buffer src.
* last_first == FIRST_TO_LAST means, that we copy/delete first items from src.
* last_first == LAST_TO_FIRST means, that we copy/delete last items from src.
@@ -385,8 +405,10 @@ static void internal_move_pointers_items(struct buffer_info *dest_bi,
if (last_first == FIRST_TO_LAST) { /* shift_left occurs */
first_pointer = 0;
first_item = 0;
- /* delete cpy_num - del_par pointers and keys starting for pointers with first_pointer,
- for key - with first_item */
+ /*
+ * delete cpy_num - del_par pointers and keys starting for
+ * pointers with first_pointer, for key - with first_item
+ */
internal_delete_pointers_items(src_bi, first_pointer,
first_item, cpy_num - del_par);
} else { /* shift_right occurs */
@@ -404,7 +426,9 @@ static void internal_move_pointers_items(struct buffer_info *dest_bi,
}
/* 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, int dest_position_before, /* insert key before key with n_dest number */
+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;
@@ -429,12 +453,12 @@ static void internal_insert_key(struct buffer_info *dest_bi, int dest_position_b
nr = blkh_nr_item(blkh);
/* prepare space for inserting key */
- key = B_N_PDELIM_KEY(dest, dest_position_before);
+ 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, B_N_PDELIM_KEY(src, src_position), KEY_SIZE);
+ memcpy(key, internal_key(src, src_position), KEY_SIZE);
/* Change dirt, free space, item number fields. */
@@ -453,13 +477,19 @@ static void internal_insert_key(struct buffer_info *dest_bi, int dest_position_b
}
}
-/* Insert d_key'th (delimiting) key from buffer cfl to tail of dest.
- * Copy pointer_amount node pointers and pointer_amount - 1 items from buffer src to buffer dest.
+/*
+ * Insert d_key'th (delimiting) key from buffer cfl to tail of dest.
+ * Copy pointer_amount node pointers and pointer_amount - 1 items from
+ * buffer src to buffer dest.
* Replace d_key'th key in buffer cfl.
* Delete pointer_amount items and node pointers from buffer src.
*/
/* this can be invoked both to shift from S to L and from R to S */
-static void internal_shift_left(int mode, /* INTERNAL_FROM_S_TO_L | INTERNAL_FROM_R_TO_S */
+static void internal_shift_left(
+ /*
+ * INTERNAL_FROM_S_TO_L | INTERNAL_FROM_R_TO_S
+ */
+ int mode,
struct tree_balance *tb,
int h, int pointer_amount)
{
@@ -473,7 +503,10 @@ static void internal_shift_left(int mode, /* INTERNAL_FROM_S_TO_L | INTERNAL_FRO
/*printk("pointer_amount = %d\n",pointer_amount); */
if (pointer_amount) {
- /* insert delimiting key from common father of dest and src to node dest into position B_NR_ITEM(dest) */
+ /*
+ * insert delimiting key from common father of dest and
+ * src to node dest into position B_NR_ITEM(dest)
+ */
internal_insert_key(&dest_bi, B_NR_ITEMS(dest_bi.bi_bh), cf,
d_key_position);
@@ -492,7 +525,8 @@ static void internal_shift_left(int mode, /* INTERNAL_FROM_S_TO_L | INTERNAL_FRO
}
-/* Insert delimiting key to L[h].
+/*
+ * Insert delimiting key to L[h].
* Copy n node pointers and n - 1 items from buffer S[h] to L[h].
* Delete n - 1 items and node pointers from buffer S[h].
*/
@@ -507,23 +541,27 @@ static void internal_shift1_left(struct tree_balance *tb,
internal_define_dest_src_infos(INTERNAL_SHIFT_FROM_S_TO_L, tb, h,
&dest_bi, &src_bi, &d_key_position, &cf);
- if (pointer_amount > 0) /* insert lkey[h]-th key from CFL[h] to left neighbor L[h] */
+ /* insert lkey[h]-th key from CFL[h] to left neighbor L[h] */
+ if (pointer_amount > 0)
internal_insert_key(&dest_bi, B_NR_ITEMS(dest_bi.bi_bh), cf,
d_key_position);
- /* internal_insert_key (tb->L[h], B_NR_ITEM(tb->L[h]), tb->CFL[h], tb->lkey[h]); */
/* last parameter is del_parameter */
internal_move_pointers_items(&dest_bi, &src_bi, FIRST_TO_LAST,
pointer_amount, 1);
- /* internal_move_pointers_items (tb->L[h], tb->S[h], FIRST_TO_LAST, pointer_amount, 1); */
}
-/* Insert d_key'th (delimiting) key from buffer cfr to head of dest.
+/*
+ * 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 */
+static void internal_shift_right(
+ /*
+ * INTERNAL_FROM_S_TO_R | INTERNAL_FROM_L_TO_S
+ */
+ int mode,
struct tree_balance *tb,
int h, int pointer_amount)
{
@@ -538,7 +576,10 @@ static void internal_shift_right(int mode, /* INTERNAL_FROM_S_TO_R | INTERNAL_FR
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 */
+ /*
+ * 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] */ ||
@@ -559,7 +600,8 @@ static void internal_shift_right(int mode, /* INTERNAL_FROM_S_TO_R | INTERNAL_FR
pointer_amount, 0);
}
-/* Insert delimiting key to R[h].
+/*
+ * Insert delimiting key to R[h].
* Copy n node pointers and n - 1 items from buffer S[h] to R[h].
* Delete n - 1 items and node pointers from buffer S[h].
*/
@@ -574,18 +616,19 @@ static void internal_shift1_right(struct tree_balance *tb,
internal_define_dest_src_infos(INTERNAL_SHIFT_FROM_S_TO_R, tb, h,
&dest_bi, &src_bi, &d_key_position, &cf);
- if (pointer_amount > 0) /* insert rkey from CFR[h] to right neighbor R[h] */
+ /* insert rkey from CFR[h] to right neighbor R[h] */
+ if (pointer_amount > 0)
internal_insert_key(&dest_bi, 0, cf, d_key_position);
- /* internal_insert_key (tb->R[h], 0, tb->CFR[h], tb->rkey[h]); */
/* last parameter is del_parameter */
internal_move_pointers_items(&dest_bi, &src_bi, LAST_TO_FIRST,
pointer_amount, 1);
- /* internal_move_pointers_items (tb->R[h], tb->S[h], LAST_TO_FIRST, pointer_amount, 1); */
}
-/* Delete insert_num node pointers together with their left items
- * and balance current node.*/
+/*
+ * 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)
{
@@ -626,9 +669,11 @@ static void balance_internal_when_delete(struct tree_balance *tb,
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 */
+ /*
+ * 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 --;
+ /*REISERFS_SB(tb->tb_sb)->s_rs->s_tree_height --; */
PUT_SB_TREE_HEIGHT(tb->tb_sb,
SB_TREE_HEIGHT(tb->tb_sb) - 1);
@@ -636,8 +681,8 @@ static void balance_internal_when_delete(struct tree_balance *tb,
REISERFS_SB(tb->tb_sb)->s_sbh,
1);
/*&&&&&&&&&&&&&&&&&&&&&& */
+ /* use check_internal if new root is an internal node */
if (h > 1)
- /* use check_internal if new root is an internal node */
check_internal(new_root);
/*&&&&&&&&&&&&&&&&&&&&&& */
@@ -648,7 +693,8 @@ static void balance_internal_when_delete(struct tree_balance *tb,
return;
}
- if (tb->L[h] && tb->lnum[h] == -B_NR_ITEMS(tb->L[h]) - 1) { /* join S[h] with L[h] */
+ /* join S[h] with L[h] */
+ if (tb->L[h] && tb->lnum[h] == -B_NR_ITEMS(tb->L[h]) - 1) {
RFALSE(tb->rnum[h] != 0,
"invalid tb->rnum[%d]==%d when joining S[h] with L[h]",
@@ -660,7 +706,8 @@ static void balance_internal_when_delete(struct tree_balance *tb,
return;
}
- if (tb->R[h] && tb->rnum[h] == -B_NR_ITEMS(tb->R[h]) - 1) { /* join S[h] with R[h] */
+ /* join S[h] with R[h] */
+ if (tb->R[h] && tb->rnum[h] == -B_NR_ITEMS(tb->R[h]) - 1) {
RFALSE(tb->lnum[h] != 0,
"invalid tb->lnum[%d]==%d when joining S[h] with R[h]",
h, tb->lnum[h]);
@@ -671,17 +718,18 @@ static void balance_internal_when_delete(struct tree_balance *tb,
return;
}
- if (tb->lnum[h] < 0) { /* borrow from left neighbor L[h] */
+ /* borrow from left neighbor L[h] */
+ if (tb->lnum[h] < 0) {
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] */
+ /* borrow from right neighbor R[h] */
+ if (tb->rnum[h] < 0) {
RFALSE(tb->lnum[h] != 0,
"invalid tb->lnum[%d]==%d when borrow from R[h]",
h, tb->lnum[h]);
@@ -689,7 +737,8 @@ static void balance_internal_when_delete(struct tree_balance *tb,
return;
}
- if (tb->lnum[h] > 0) { /* split S[h] into two parts and put them into neighbors */
+ /* split S[h] into two parts and put them into neighbors */
+ if (tb->lnum[h] > 0) {
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);
@@ -717,7 +766,7 @@ static void replace_lkey(struct tree_balance *tb, int h, struct item_head *key)
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);
+ memcpy(internal_key(tb->CFL[h], tb->lkey[h]), key, KEY_SIZE);
do_balance_mark_internal_dirty(tb, tb->CFL[h], 0);
}
@@ -732,34 +781,41 @@ static void replace_rkey(struct tree_balance *tb, int h, struct item_head *key)
"R[h] can not be empty if it exists (item number=%d)",
B_NR_ITEMS(tb->R[h]));
- memcpy(B_N_PDELIM_KEY(tb->CFR[h], tb->rkey[h]), key, KEY_SIZE);
+ memcpy(internal_key(tb->CFR[h], tb->rkey[h]), key, KEY_SIZE);
do_balance_mark_internal_dirty(tb, tb->CFR[h], 0);
}
-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.
- }
- */
+
+/*
+ * 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.
+ * }
+ */
+
+int balance_internal(struct tree_balance *tb,
+ int h, /* level of the tree */
+ int child_pos,
+ /* key for insertion on higher level */
+ struct item_head *insert_key,
+ /* node for insertion on higher level */
+ struct buffer_head **insert_ptr)
{
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 */
+
+ /*
+ * we return this: it is 0 if there is no S[h],
+ * else it is tb->S[h]->b_item_order
+ */
+ int order;
int insert_num, n, k;
struct buffer_head *S_new;
struct item_head new_insert_key;
@@ -774,8 +830,10 @@ int balance_internal(struct tree_balance *tb, /* tree_balance structure
(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]. */
+ /*
+ * 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 * */
@@ -794,23 +852,21 @@ int balance_internal(struct tree_balance *tb, /* tree_balance structure
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 */
+ /*
+ * 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];
@@ -826,7 +882,10 @@ int balance_internal(struct tree_balance *tb, /* tree_balance structure
} else {
struct disk_child *dc;
- /* some items fall into L[h] or CFL[h], but some don't fall */
+ /*
+ * 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;
@@ -841,7 +900,10 @@ int balance_internal(struct tree_balance *tb, /* tree_balance structure
replace_lkey(tb, h, insert_key + k);
- /* replace the first node-ptr in S[h] by node-ptr to insert_ptr[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]) -
@@ -860,17 +922,17 @@ int balance_internal(struct tree_balance *tb, /* tree_balance structure
/* 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 */
+ /*
+ * 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);
@@ -904,7 +966,10 @@ int balance_internal(struct tree_balance *tb, /* tree_balance structure
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] */
+ /*
+ * 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
@@ -921,7 +986,7 @@ int balance_internal(struct tree_balance *tb, /* tree_balance structure
}
}
- /** Fill new node that appears instead of S[h] **/
+ /** 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");
@@ -997,26 +1062,30 @@ int balance_internal(struct tree_balance *tb, /* tree_balance structure
/* 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),
+ memcpy(&new_insert_key, internal_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] */
+ /*
+ * 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),
+ internal_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 */
+ /*
+ * 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 +
@@ -1033,7 +1102,6 @@ int balance_internal(struct tree_balance *tb, /* tree_balance structure
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;
@@ -1043,7 +1111,10 @@ int balance_internal(struct tree_balance *tb, /* tree_balance structure
/* 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] */
+ /*
+ * 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,
@@ -1066,7 +1137,7 @@ int balance_internal(struct tree_balance *tb, /* tree_balance structure
|| buffer_dirty(S_new), "cm-00001: bad S_new (%b)",
S_new);
- // S_new is released in unfix_nodes
+ /* S_new is released in unfix_nodes */
}
n = B_NR_ITEMS(tbSh); /*number of items in S[h] */
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.