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do_balan.c
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do_balan.c
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/*
* Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
*/
/*
* Now we have all buffers that must be used in balancing of the tree
* Further calculations can not cause schedule(), and thus the buffer
* tree will be stable until the balancing will be finished
* balance the tree according to the analysis made before,
* and using buffers obtained after all above.
*/
#include <linux/uaccess.h>
#include <linux/time.h>
#include "reiserfs.h"
#include <linux/buffer_head.h>
#include <linux/kernel.h>
static inline void buffer_info_init_left(struct tree_balance *tb,
struct buffer_info *bi)
{
bi->tb = tb;
bi->bi_bh = tb->L[0];
bi->bi_parent = tb->FL[0];
bi->bi_position = get_left_neighbor_position(tb, 0);
}
static inline void buffer_info_init_right(struct tree_balance *tb,
struct buffer_info *bi)
{
bi->tb = tb;
bi->bi_bh = tb->R[0];
bi->bi_parent = tb->FR[0];
bi->bi_position = get_right_neighbor_position(tb, 0);
}
static inline void buffer_info_init_tbS0(struct tree_balance *tb,
struct buffer_info *bi)
{
bi->tb = tb;
bi->bi_bh = PATH_PLAST_BUFFER(tb->tb_path);
bi->bi_parent = PATH_H_PPARENT(tb->tb_path, 0);
bi->bi_position = PATH_H_POSITION(tb->tb_path, 1);
}
static inline void buffer_info_init_bh(struct tree_balance *tb,
struct buffer_info *bi,
struct buffer_head *bh)
{
bi->tb = tb;
bi->bi_bh = bh;
bi->bi_parent = NULL;
bi->bi_position = 0;
}
inline void do_balance_mark_leaf_dirty(struct tree_balance *tb,
struct buffer_head *bh, int flag)
{
journal_mark_dirty(tb->transaction_handle, bh);
}
#define do_balance_mark_internal_dirty do_balance_mark_leaf_dirty
#define do_balance_mark_sb_dirty do_balance_mark_leaf_dirty
/*
* summary:
* if deleting something ( tb->insert_size[0] < 0 )
* return(balance_leaf_when_delete()); (flag d handled here)
* else
* if lnum is larger than 0 we put items into the left node
* if rnum is larger than 0 we put items into the right node
* if snum1 is larger than 0 we put items into the new node s1
* if snum2 is larger than 0 we put items into the new node s2
* Note that all *num* count new items being created.
*/
static void balance_leaf_when_delete_del(struct tree_balance *tb)
{
struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
int item_pos = PATH_LAST_POSITION(tb->tb_path);
struct buffer_info bi;
#ifdef CONFIG_REISERFS_CHECK
struct item_head *ih = item_head(tbS0, item_pos);
#endif
RFALSE(ih_item_len(ih) + IH_SIZE != -tb->insert_size[0],
"vs-12013: mode Delete, insert size %d, ih to be deleted %h",
-tb->insert_size[0], ih);
buffer_info_init_tbS0(tb, &bi);
leaf_delete_items(&bi, 0, item_pos, 1, -1);
if (!item_pos && tb->CFL[0]) {
if (B_NR_ITEMS(tbS0)) {
replace_key(tb, tb->CFL[0], tb->lkey[0], tbS0, 0);
} else {
if (!PATH_H_POSITION(tb->tb_path, 1))
replace_key(tb, tb->CFL[0], tb->lkey[0],
PATH_H_PPARENT(tb->tb_path, 0), 0);
}
}
RFALSE(!item_pos && !tb->CFL[0],
"PAP-12020: tb->CFL[0]==%p, tb->L[0]==%p", tb->CFL[0],
tb->L[0]);
}
/* cut item in S[0] */
static void balance_leaf_when_delete_cut(struct tree_balance *tb)
{
struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
int item_pos = PATH_LAST_POSITION(tb->tb_path);
struct item_head *ih = item_head(tbS0, item_pos);
int pos_in_item = tb->tb_path->pos_in_item;
struct buffer_info bi;
buffer_info_init_tbS0(tb, &bi);
if (is_direntry_le_ih(ih)) {
/*
* UFS unlink semantics are such that you can only
* delete one directory entry at a time.
*
* when we cut a directory tb->insert_size[0] means
* number of entries to be cut (always 1)
*/
tb->insert_size[0] = -1;
leaf_cut_from_buffer(&bi, item_pos, pos_in_item,
-tb->insert_size[0]);
RFALSE(!item_pos && !pos_in_item && !tb->CFL[0],
"PAP-12030: can not change delimiting key. CFL[0]=%p",
tb->CFL[0]);
if (!item_pos && !pos_in_item && tb->CFL[0])
replace_key(tb, tb->CFL[0], tb->lkey[0], tbS0, 0);
} else {
leaf_cut_from_buffer(&bi, item_pos, pos_in_item,
-tb->insert_size[0]);
RFALSE(!ih_item_len(ih),
"PAP-12035: cut must leave non-zero dynamic "
"length of item");
}
}
static int balance_leaf_when_delete_left(struct tree_balance *tb)
{
struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
int n = B_NR_ITEMS(tbS0);
/* L[0] must be joined with S[0] */
if (tb->lnum[0] == -1) {
/* R[0] must be also joined with S[0] */
if (tb->rnum[0] == -1) {
if (tb->FR[0] == PATH_H_PPARENT(tb->tb_path, 0)) {
/*
* all contents of all the
* 3 buffers will be in L[0]
*/
if (PATH_H_POSITION(tb->tb_path, 1) == 0 &&
1 < B_NR_ITEMS(tb->FR[0]))
replace_key(tb, tb->CFL[0],
tb->lkey[0], tb->FR[0], 1);
leaf_move_items(LEAF_FROM_S_TO_L, tb, n, -1,
NULL);
leaf_move_items(LEAF_FROM_R_TO_L, tb,
B_NR_ITEMS(tb->R[0]), -1,
NULL);
reiserfs_invalidate_buffer(tb, tbS0);
reiserfs_invalidate_buffer(tb, tb->R[0]);
return 0;
}
/* all contents of all the 3 buffers will be in R[0] */
leaf_move_items(LEAF_FROM_S_TO_R, tb, n, -1, NULL);
leaf_move_items(LEAF_FROM_L_TO_R, tb,
B_NR_ITEMS(tb->L[0]), -1, NULL);
/* right_delimiting_key is correct in R[0] */
replace_key(tb, tb->CFR[0], tb->rkey[0], tb->R[0], 0);
reiserfs_invalidate_buffer(tb, tbS0);
reiserfs_invalidate_buffer(tb, tb->L[0]);
return -1;
}
RFALSE(tb->rnum[0] != 0,
"PAP-12045: rnum must be 0 (%d)", tb->rnum[0]);
/* all contents of L[0] and S[0] will be in L[0] */
leaf_shift_left(tb, n, -1);
reiserfs_invalidate_buffer(tb, tbS0);
return 0;
}
/*
* a part of contents of S[0] will be in L[0] and
* the rest part of S[0] will be in R[0]
*/
RFALSE((tb->lnum[0] + tb->rnum[0] < n) ||
(tb->lnum[0] + tb->rnum[0] > n + 1),
"PAP-12050: rnum(%d) and lnum(%d) and item "
"number(%d) in S[0] are not consistent",
tb->rnum[0], tb->lnum[0], n);
RFALSE((tb->lnum[0] + tb->rnum[0] == n) &&
(tb->lbytes != -1 || tb->rbytes != -1),
"PAP-12055: bad rbytes (%d)/lbytes (%d) "
"parameters when items are not split",
tb->rbytes, tb->lbytes);
RFALSE((tb->lnum[0] + tb->rnum[0] == n + 1) &&
(tb->lbytes < 1 || tb->rbytes != -1),
"PAP-12060: bad rbytes (%d)/lbytes (%d) "
"parameters when items are split",
tb->rbytes, tb->lbytes);
leaf_shift_left(tb, tb->lnum[0], tb->lbytes);
leaf_shift_right(tb, tb->rnum[0], tb->rbytes);
reiserfs_invalidate_buffer(tb, tbS0);
return 0;
}
/*
* Balance leaf node in case of delete or cut: insert_size[0] < 0
*
* lnum, rnum can have values >= -1
* -1 means that the neighbor must be joined with S
* 0 means that nothing should be done with the neighbor
* >0 means to shift entirely or partly the specified number of items
* to the neighbor
*/
static int balance_leaf_when_delete(struct tree_balance *tb, int flag)
{
struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
struct buffer_info bi;
int n;
RFALSE(tb->FR[0] && B_LEVEL(tb->FR[0]) != DISK_LEAF_NODE_LEVEL + 1,
"vs- 12000: level: wrong FR %z", tb->FR[0]);
RFALSE(tb->blknum[0] > 1,
"PAP-12005: tb->blknum == %d, can not be > 1", tb->blknum[0]);
RFALSE(!tb->blknum[0] && !PATH_H_PPARENT(tb->tb_path, 0),
"PAP-12010: tree can not be empty");
buffer_info_init_tbS0(tb, &bi);
/* Delete or truncate the item */
BUG_ON(flag != M_DELETE && flag != M_CUT);
if (flag == M_DELETE)
balance_leaf_when_delete_del(tb);
else /* M_CUT */
balance_leaf_when_delete_cut(tb);
/*
* the rule is that no shifting occurs unless by shifting
* a node can be freed
*/
n = B_NR_ITEMS(tbS0);
/* L[0] takes part in balancing */
if (tb->lnum[0])
return balance_leaf_when_delete_left(tb);
if (tb->rnum[0] == -1) {
/* all contents of R[0] and S[0] will be in R[0] */
leaf_shift_right(tb, n, -1);
reiserfs_invalidate_buffer(tb, tbS0);
return 0;
}
RFALSE(tb->rnum[0],
"PAP-12065: bad rnum parameter must be 0 (%d)", tb->rnum[0]);
return 0;
}
static unsigned int balance_leaf_insert_left(struct tree_balance *tb,
struct item_head *const ih,
const char * const body)
{
int ret;
struct buffer_info bi;
int n = B_NR_ITEMS(tb->L[0]);
unsigned body_shift_bytes = 0;
if (tb->item_pos == tb->lnum[0] - 1 && tb->lbytes != -1) {
/* part of new item falls into L[0] */
int new_item_len, shift;
ret = leaf_shift_left(tb, tb->lnum[0] - 1, -1);
/* Calculate item length to insert to S[0] */
new_item_len = ih_item_len(ih) - tb->lbytes;
/* Calculate and check item length to insert to L[0] */
put_ih_item_len(ih, ih_item_len(ih) - new_item_len);
RFALSE(ih_item_len(ih) <= 0,
"PAP-12080: there is nothing to insert into L[0]: "
"ih_item_len=%d", ih_item_len(ih));
/* Insert new item into L[0] */
buffer_info_init_left(tb, &bi);
leaf_insert_into_buf(&bi, n + tb->item_pos - ret, ih, body,
min_t(int, tb->zeroes_num, ih_item_len(ih)));
/*
* Calculate key component, item length and body to
* insert into S[0]
*/
shift = 0;
if (is_indirect_le_ih(ih))
shift = tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT;
add_le_ih_k_offset(ih, tb->lbytes << shift);
put_ih_item_len(ih, new_item_len);
if (tb->lbytes > tb->zeroes_num) {
body_shift_bytes = tb->lbytes - tb->zeroes_num;
tb->zeroes_num = 0;
} else
tb->zeroes_num -= tb->lbytes;
RFALSE(ih_item_len(ih) <= 0,
"PAP-12085: there is nothing to insert into S[0]: "
"ih_item_len=%d", ih_item_len(ih));
} else {
/* new item in whole falls into L[0] */
/* Shift lnum[0]-1 items to L[0] */
ret = leaf_shift_left(tb, tb->lnum[0] - 1, tb->lbytes);
/* Insert new item into L[0] */
buffer_info_init_left(tb, &bi);
leaf_insert_into_buf(&bi, n + tb->item_pos - ret, ih, body,
tb->zeroes_num);
tb->insert_size[0] = 0;
tb->zeroes_num = 0;
}
return body_shift_bytes;
}
static void balance_leaf_paste_left_shift_dirent(struct tree_balance *tb,
struct item_head * const ih,
const char * const body)
{
int n = B_NR_ITEMS(tb->L[0]);
struct buffer_info bi;
RFALSE(tb->zeroes_num,
"PAP-12090: invalid parameter in case of a directory");
/* directory item */
if (tb->lbytes > tb->pos_in_item) {
/* new directory entry falls into L[0] */
struct item_head *pasted;
int ret, l_pos_in_item = tb->pos_in_item;
/*
* Shift lnum[0] - 1 items in whole.
* Shift lbytes - 1 entries from given directory item
*/
ret = leaf_shift_left(tb, tb->lnum[0], tb->lbytes - 1);
if (ret && !tb->item_pos) {
pasted = item_head(tb->L[0], B_NR_ITEMS(tb->L[0]) - 1);
l_pos_in_item += ih_entry_count(pasted) -
(tb->lbytes - 1);
}
/* Append given directory entry to directory item */
buffer_info_init_left(tb, &bi);
leaf_paste_in_buffer(&bi, n + tb->item_pos - ret,
l_pos_in_item, tb->insert_size[0],
body, tb->zeroes_num);
/*
* previous string prepared space for pasting new entry,
* following string pastes this entry
*/
/*
* when we have merge directory item, pos_in_item
* has been changed too
*/
/* paste new directory entry. 1 is entry number */
leaf_paste_entries(&bi, n + tb->item_pos - ret,
l_pos_in_item, 1,
(struct reiserfs_de_head *) body,
body + DEH_SIZE, tb->insert_size[0]);
tb->insert_size[0] = 0;
} else {
/* new directory item doesn't fall into L[0] */
/*
* Shift lnum[0]-1 items in whole. Shift lbytes
* directory entries from directory item number lnum[0]
*/
leaf_shift_left(tb, tb->lnum[0], tb->lbytes);
}
/* Calculate new position to append in item body */
tb->pos_in_item -= tb->lbytes;
}
static unsigned int balance_leaf_paste_left_shift(struct tree_balance *tb,
struct item_head * const ih,
const char * const body)
{
struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
int n = B_NR_ITEMS(tb->L[0]);
struct buffer_info bi;
int body_shift_bytes = 0;
if (is_direntry_le_ih(item_head(tbS0, tb->item_pos))) {
balance_leaf_paste_left_shift_dirent(tb, ih, body);
return 0;
}
RFALSE(tb->lbytes <= 0,
"PAP-12095: there is nothing to shift to L[0]. "
"lbytes=%d", tb->lbytes);
RFALSE(tb->pos_in_item != ih_item_len(item_head(tbS0, tb->item_pos)),
"PAP-12100: incorrect position to paste: "
"item_len=%d, pos_in_item=%d",
ih_item_len(item_head(tbS0, tb->item_pos)), tb->pos_in_item);
/* appended item will be in L[0] in whole */
if (tb->lbytes >= tb->pos_in_item) {
struct item_head *tbS0_pos_ih, *tbL0_ih;
struct item_head *tbS0_0_ih;
struct reiserfs_key *left_delim_key;
int ret, l_n, version, temp_l;
tbS0_pos_ih = item_head(tbS0, tb->item_pos);
tbS0_0_ih = item_head(tbS0, 0);
/*
* this bytes number must be appended
* to the last item of L[h]
*/
l_n = tb->lbytes - tb->pos_in_item;
/* Calculate new insert_size[0] */
tb->insert_size[0] -= l_n;
RFALSE(tb->insert_size[0] <= 0,
"PAP-12105: there is nothing to paste into "
"L[0]. insert_size=%d", tb->insert_size[0]);
ret = leaf_shift_left(tb, tb->lnum[0],
ih_item_len(tbS0_pos_ih));
tbL0_ih = item_head(tb->L[0], n + tb->item_pos - ret);
/* Append to body of item in L[0] */
buffer_info_init_left(tb, &bi);
leaf_paste_in_buffer(&bi, n + tb->item_pos - ret,
ih_item_len(tbL0_ih), l_n, body,
min_t(int, l_n, tb->zeroes_num));
/*
* 0-th item in S0 can be only of DIRECT type
* when l_n != 0
*/
temp_l = l_n;
RFALSE(ih_item_len(tbS0_0_ih),
"PAP-12106: item length must be 0");
RFALSE(comp_short_le_keys(&tbS0_0_ih->ih_key,
leaf_key(tb->L[0], n + tb->item_pos - ret)),
"PAP-12107: items must be of the same file");
if (is_indirect_le_ih(tbL0_ih)) {
int shift = tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT;
temp_l = l_n << shift;
}
/* update key of first item in S0 */
version = ih_version(tbS0_0_ih);
add_le_key_k_offset(version, &tbS0_0_ih->ih_key, temp_l);
/* update left delimiting key */
left_delim_key = internal_key(tb->CFL[0], tb->lkey[0]);
add_le_key_k_offset(version, left_delim_key, temp_l);
/*
* Calculate new body, position in item and
* insert_size[0]
*/
if (l_n > tb->zeroes_num) {
body_shift_bytes = l_n - tb->zeroes_num;
tb->zeroes_num = 0;
} else
tb->zeroes_num -= l_n;
tb->pos_in_item = 0;
RFALSE(comp_short_le_keys(&tbS0_0_ih->ih_key,
leaf_key(tb->L[0],
B_NR_ITEMS(tb->L[0]) - 1)) ||
!op_is_left_mergeable(leaf_key(tbS0, 0), tbS0->b_size) ||
!op_is_left_mergeable(left_delim_key, tbS0->b_size),
"PAP-12120: item must be merge-able with left "
"neighboring item");
} else {
/* only part of the appended item will be in L[0] */
/* Calculate position in item for append in S[0] */
tb->pos_in_item -= tb->lbytes;
RFALSE(tb->pos_in_item <= 0,
"PAP-12125: no place for paste. pos_in_item=%d",
tb->pos_in_item);
/*
* Shift lnum[0] - 1 items in whole.
* Shift lbytes - 1 byte from item number lnum[0]
*/
leaf_shift_left(tb, tb->lnum[0], tb->lbytes);
}
return body_shift_bytes;
}
/* appended item will be in L[0] in whole */
static void balance_leaf_paste_left_whole(struct tree_balance *tb,
struct item_head * const ih,
const char * const body)
{
struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
int n = B_NR_ITEMS(tb->L[0]);
struct buffer_info bi;
struct item_head *pasted;
int ret;
/* if we paste into first item of S[0] and it is left mergable */
if (!tb->item_pos &&
op_is_left_mergeable(leaf_key(tbS0, 0), tbS0->b_size)) {
/*
* then increment pos_in_item by the size of the
* last item in L[0]
*/
pasted = item_head(tb->L[0], n - 1);
if (is_direntry_le_ih(pasted))
tb->pos_in_item += ih_entry_count(pasted);
else
tb->pos_in_item += ih_item_len(pasted);
}
/*
* Shift lnum[0] - 1 items in whole.
* Shift lbytes - 1 byte from item number lnum[0]
*/
ret = leaf_shift_left(tb, tb->lnum[0], tb->lbytes);
/* Append to body of item in L[0] */
buffer_info_init_left(tb, &bi);
leaf_paste_in_buffer(&bi, n + tb->item_pos - ret, tb->pos_in_item,
tb->insert_size[0], body, tb->zeroes_num);
/* if appended item is directory, paste entry */
pasted = item_head(tb->L[0], n + tb->item_pos - ret);
if (is_direntry_le_ih(pasted))
leaf_paste_entries(&bi, n + tb->item_pos - ret,
tb->pos_in_item, 1,
(struct reiserfs_de_head *)body,
body + DEH_SIZE, tb->insert_size[0]);
/*
* if appended item is indirect item, put unformatted node
* into un list
*/
if (is_indirect_le_ih(pasted))
set_ih_free_space(pasted, 0);
tb->insert_size[0] = 0;
tb->zeroes_num = 0;
}
static unsigned int balance_leaf_paste_left(struct tree_balance *tb,
struct item_head * const ih,
const char * const body)
{
/* we must shift the part of the appended item */
if (tb->item_pos == tb->lnum[0] - 1 && tb->lbytes != -1)
return balance_leaf_paste_left_shift(tb, ih, body);
else
balance_leaf_paste_left_whole(tb, ih, body);
return 0;
}
/* Shift lnum[0] items from S[0] to the left neighbor L[0] */
static unsigned int balance_leaf_left(struct tree_balance *tb,
struct item_head * const ih,
const char * const body, int flag)
{
if (tb->lnum[0] <= 0)
return 0;
/* new item or it part falls to L[0], shift it too */
if (tb->item_pos < tb->lnum[0]) {
BUG_ON(flag != M_INSERT && flag != M_PASTE);
if (flag == M_INSERT)
return balance_leaf_insert_left(tb, ih, body);
else /* M_PASTE */
return balance_leaf_paste_left(tb, ih, body);
} else
/* new item doesn't fall into L[0] */
leaf_shift_left(tb, tb->lnum[0], tb->lbytes);
return 0;
}
static void balance_leaf_insert_right(struct tree_balance *tb,
struct item_head * const ih,
const char * const body)
{
struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
int n = B_NR_ITEMS(tbS0);
struct buffer_info bi;
/* new item or part of it doesn't fall into R[0] */
if (n - tb->rnum[0] >= tb->item_pos) {
leaf_shift_right(tb, tb->rnum[0], tb->rbytes);
return;
}
/* new item or its part falls to R[0] */
/* part of new item falls into R[0] */
if (tb->item_pos == n - tb->rnum[0] + 1 && tb->rbytes != -1) {
loff_t old_key_comp, old_len, r_zeroes_number;
const char *r_body;
int shift;
loff_t offset;
leaf_shift_right(tb, tb->rnum[0] - 1, -1);
/* Remember key component and item length */
old_key_comp = le_ih_k_offset(ih);
old_len = ih_item_len(ih);
/*
* Calculate key component and item length to insert
* into R[0]
*/
shift = 0;
if (is_indirect_le_ih(ih))
shift = tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT;
offset = le_ih_k_offset(ih) + ((old_len - tb->rbytes) << shift);
set_le_ih_k_offset(ih, offset);
put_ih_item_len(ih, tb->rbytes);
/* Insert part of the item into R[0] */
buffer_info_init_right(tb, &bi);
if ((old_len - tb->rbytes) > tb->zeroes_num) {
r_zeroes_number = 0;
r_body = body + (old_len - tb->rbytes) - tb->zeroes_num;
} else {
r_body = body;
r_zeroes_number = tb->zeroes_num -
(old_len - tb->rbytes);
tb->zeroes_num -= r_zeroes_number;
}
leaf_insert_into_buf(&bi, 0, ih, r_body, r_zeroes_number);
/* Replace right delimiting key by first key in R[0] */
replace_key(tb, tb->CFR[0], tb->rkey[0], tb->R[0], 0);
/*
* Calculate key component and item length to
* insert into S[0]
*/
set_le_ih_k_offset(ih, old_key_comp);
put_ih_item_len(ih, old_len - tb->rbytes);
tb->insert_size[0] -= tb->rbytes;
} else {
/* whole new item falls into R[0] */
/* Shift rnum[0]-1 items to R[0] */
leaf_shift_right(tb, tb->rnum[0] - 1, tb->rbytes);
/* Insert new item into R[0] */
buffer_info_init_right(tb, &bi);
leaf_insert_into_buf(&bi, tb->item_pos - n + tb->rnum[0] - 1,
ih, body, tb->zeroes_num);
if (tb->item_pos - n + tb->rnum[0] - 1 == 0)
replace_key(tb, tb->CFR[0], tb->rkey[0], tb->R[0], 0);
tb->zeroes_num = tb->insert_size[0] = 0;
}
}
static void balance_leaf_paste_right_shift_dirent(struct tree_balance *tb,
struct item_head * const ih,
const char * const body)
{
struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
struct buffer_info bi;
int entry_count;
RFALSE(tb->zeroes_num,
"PAP-12145: invalid parameter in case of a directory");
entry_count = ih_entry_count(item_head(tbS0, tb->item_pos));
/* new directory entry falls into R[0] */
if (entry_count - tb->rbytes < tb->pos_in_item) {
int paste_entry_position;
RFALSE(tb->rbytes - 1 >= entry_count || !tb->insert_size[0],
"PAP-12150: no enough of entries to shift to R[0]: "
"rbytes=%d, entry_count=%d", tb->rbytes, entry_count);
/*
* Shift rnum[0]-1 items in whole.
* Shift rbytes-1 directory entries from directory
* item number rnum[0]
*/
leaf_shift_right(tb, tb->rnum[0], tb->rbytes - 1);
/* Paste given directory entry to directory item */
paste_entry_position = tb->pos_in_item - entry_count +
tb->rbytes - 1;
buffer_info_init_right(tb, &bi);
leaf_paste_in_buffer(&bi, 0, paste_entry_position,
tb->insert_size[0], body, tb->zeroes_num);
/* paste entry */
leaf_paste_entries(&bi, 0, paste_entry_position, 1,
(struct reiserfs_de_head *) body,
body + DEH_SIZE, tb->insert_size[0]);
/* change delimiting keys */
if (paste_entry_position == 0)
replace_key(tb, tb->CFR[0], tb->rkey[0], tb->R[0], 0);
tb->insert_size[0] = 0;
tb->pos_in_item++;
} else {
/* new directory entry doesn't fall into R[0] */
leaf_shift_right(tb, tb->rnum[0], tb->rbytes);
}
}
static void balance_leaf_paste_right_shift(struct tree_balance *tb,
struct item_head * const ih,
const char * const body)
{
struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
int n_shift, n_rem, r_zeroes_number, version;
unsigned long temp_rem;
const char *r_body;
struct buffer_info bi;
/* we append to directory item */
if (is_direntry_le_ih(item_head(tbS0, tb->item_pos))) {
balance_leaf_paste_right_shift_dirent(tb, ih, body);
return;
}
/* regular object */
/*
* Calculate number of bytes which must be shifted
* from appended item
*/
n_shift = tb->rbytes - tb->insert_size[0];
if (n_shift < 0)
n_shift = 0;
RFALSE(tb->pos_in_item != ih_item_len(item_head(tbS0, tb->item_pos)),
"PAP-12155: invalid position to paste. ih_item_len=%d, "
"pos_in_item=%d", tb->pos_in_item,
ih_item_len(item_head(tbS0, tb->item_pos)));
leaf_shift_right(tb, tb->rnum[0], n_shift);
/*
* Calculate number of bytes which must remain in body
* after appending to R[0]
*/
n_rem = tb->insert_size[0] - tb->rbytes;
if (n_rem < 0)
n_rem = 0;
temp_rem = n_rem;
version = ih_version(item_head(tb->R[0], 0));
if (is_indirect_le_key(version, leaf_key(tb->R[0], 0))) {
int shift = tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT;
temp_rem = n_rem << shift;
}
add_le_key_k_offset(version, leaf_key(tb->R[0], 0), temp_rem);
add_le_key_k_offset(version, internal_key(tb->CFR[0], tb->rkey[0]),
temp_rem);
do_balance_mark_internal_dirty(tb, tb->CFR[0], 0);
/* Append part of body into R[0] */
buffer_info_init_right(tb, &bi);
if (n_rem > tb->zeroes_num) {
r_zeroes_number = 0;
r_body = body + n_rem - tb->zeroes_num;
} else {
r_body = body;
r_zeroes_number = tb->zeroes_num - n_rem;
tb->zeroes_num -= r_zeroes_number;
}
leaf_paste_in_buffer(&bi, 0, n_shift, tb->insert_size[0] - n_rem,
r_body, r_zeroes_number);
if (is_indirect_le_ih(item_head(tb->R[0], 0)))
set_ih_free_space(item_head(tb->R[0], 0), 0);
tb->insert_size[0] = n_rem;
if (!n_rem)
tb->pos_in_item++;
}
static void balance_leaf_paste_right_whole(struct tree_balance *tb,
struct item_head * const ih,
const char * const body)
{
struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
int n = B_NR_ITEMS(tbS0);
struct item_head *pasted;
struct buffer_info bi;
buffer_info_init_right(tb, &bi);
leaf_shift_right(tb, tb->rnum[0], tb->rbytes);
/* append item in R[0] */
if (tb->pos_in_item >= 0) {
buffer_info_init_right(tb, &bi);
leaf_paste_in_buffer(&bi, tb->item_pos - n + tb->rnum[0],
tb->pos_in_item, tb->insert_size[0], body,
tb->zeroes_num);
}
/* paste new entry, if item is directory item */
pasted = item_head(tb->R[0], tb->item_pos - n + tb->rnum[0]);
if (is_direntry_le_ih(pasted) && tb->pos_in_item >= 0) {
leaf_paste_entries(&bi, tb->item_pos - n + tb->rnum[0],
tb->pos_in_item, 1,
(struct reiserfs_de_head *)body,
body + DEH_SIZE, tb->insert_size[0]);
if (!tb->pos_in_item) {
RFALSE(tb->item_pos - n + tb->rnum[0],
"PAP-12165: directory item must be first "
"item of node when pasting is in 0th position");
/* update delimiting keys */
replace_key(tb, tb->CFR[0], tb->rkey[0], tb->R[0], 0);
}
}
if (is_indirect_le_ih(pasted))
set_ih_free_space(pasted, 0);
tb->zeroes_num = tb->insert_size[0] = 0;
}
static void balance_leaf_paste_right(struct tree_balance *tb,
struct item_head * const ih,
const char * const body)
{
struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
int n = B_NR_ITEMS(tbS0);
/* new item doesn't fall into R[0] */
if (n - tb->rnum[0] > tb->item_pos) {
leaf_shift_right(tb, tb->rnum[0], tb->rbytes);
return;
}
/* pasted item or part of it falls to R[0] */
if (tb->item_pos == n - tb->rnum[0] && tb->rbytes != -1)
/* we must shift the part of the appended item */
balance_leaf_paste_right_shift(tb, ih, body);
else
/* pasted item in whole falls into R[0] */
balance_leaf_paste_right_whole(tb, ih, body);
}
/* shift rnum[0] items from S[0] to the right neighbor R[0] */
static void balance_leaf_right(struct tree_balance *tb,
struct item_head * const ih,
const char * const body, int flag)
{
if (tb->rnum[0] <= 0)
return;
BUG_ON(flag != M_INSERT && flag != M_PASTE);
if (flag == M_INSERT)
balance_leaf_insert_right(tb, ih, body);
else /* M_PASTE */
balance_leaf_paste_right(tb, ih, body);
}
static void balance_leaf_new_nodes_insert(struct tree_balance *tb,
struct item_head * const ih,
const char * const body,
struct item_head *insert_key,
struct buffer_head **insert_ptr,
int i)
{
struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
int n = B_NR_ITEMS(tbS0);
struct buffer_info bi;
int shift;
/* new item or it part don't falls into S_new[i] */
if (n - tb->snum[i] >= tb->item_pos) {
leaf_move_items(LEAF_FROM_S_TO_SNEW, tb,
tb->snum[i], tb->sbytes[i], tb->S_new[i]);
return;
}
/* new item or it's part falls to first new node S_new[i] */
/* part of new item falls into S_new[i] */
if (tb->item_pos == n - tb->snum[i] + 1 && tb->sbytes[i] != -1) {
int old_key_comp, old_len, r_zeroes_number;
const char *r_body;
/* Move snum[i]-1 items from S[0] to S_new[i] */
leaf_move_items(LEAF_FROM_S_TO_SNEW, tb, tb->snum[i] - 1, -1,
tb->S_new[i]);
/* Remember key component and item length */
old_key_comp = le_ih_k_offset(ih);
old_len = ih_item_len(ih);
/*
* Calculate key component and item length to insert
* into S_new[i]
*/
shift = 0;
if (is_indirect_le_ih(ih))
shift = tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT;
set_le_ih_k_offset(ih,
le_ih_k_offset(ih) +
((old_len - tb->sbytes[i]) << shift));
put_ih_item_len(ih, tb->sbytes[i]);
/* Insert part of the item into S_new[i] before 0-th item */
buffer_info_init_bh(tb, &bi, tb->S_new[i]);
if ((old_len - tb->sbytes[i]) > tb->zeroes_num) {
r_zeroes_number = 0;
r_body = body + (old_len - tb->sbytes[i]) -
tb->zeroes_num;
} else {
r_body = body;
r_zeroes_number = tb->zeroes_num - (old_len -
tb->sbytes[i]);
tb->zeroes_num -= r_zeroes_number;
}
leaf_insert_into_buf(&bi, 0, ih, r_body, r_zeroes_number);
/*
* Calculate key component and item length to
* insert into S[i]
*/
set_le_ih_k_offset(ih, old_key_comp);
put_ih_item_len(ih, old_len - tb->sbytes[i]);
tb->insert_size[0] -= tb->sbytes[i];
} else {
/* whole new item falls into S_new[i] */
/*
* Shift snum[0] - 1 items to S_new[i]
* (sbytes[i] of split item)
*/
leaf_move_items(LEAF_FROM_S_TO_SNEW, tb,
tb->snum[i] - 1, tb->sbytes[i], tb->S_new[i]);
/* Insert new item into S_new[i] */
buffer_info_init_bh(tb, &bi, tb->S_new[i]);