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reiserfs: balance_leaf refactor, pull out balance_leaf_insert_left 

This patch factors out a new balance_leaf_insert_left from the code in
balance_leaf responsible for inserting new items into the node to
the left of S[0] in the tree.

It is not yet formatted correctly.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jeff Mahoney 2014-04-23 10:00:47 -04:00 коммит произвёл Jan Kara
Родитель b49fb112d4
Коммит f1f007c308
1 изменённых файлов: 59 добавлений и 49 удалений
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108
fs/reiserfs/do_balan.c
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@ -290,6 +290,64 @@ static int balance_leaf_when_delete(struct tree_balance *tb, int flag)
return 0;
}
static void balance_leaf_insert_left(struct tree_balance *tb,
struct item_head *ih, const char *body)
{
int ret_val;
struct buffer_info bi;
int n = B_NR_ITEMS(tb->L[0]);
if (tb->item_pos == tb->lnum[0] - 1 && tb->lbytes != -1) {
/* part of new item falls into L[0] */
int new_item_len;
int version;
ret_val = 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_val, ih, body,
tb->zeroes_num > ih_item_len(ih) ? ih_item_len(ih) : tb->zeroes_num);
version = ih_version(ih);
/* Calculate key component, item length and body to insert into S[0] */
set_le_ih_k_offset(ih, le_ih_k_offset(ih) +
(tb->lbytes << (is_indirect_le_ih(ih) ? tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT : 0)));
put_ih_item_len(ih, new_item_len);
if (tb->lbytes > tb->zeroes_num) {
body += (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_val = 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_val, ih, body, tb->zeroes_num);
tb->insert_size[0] = 0;
tb->zeroes_num = 0;
}
}
/**
* balance_leaf - reiserfs tree balancing algorithm
* @tb: tree balance state
@ -342,55 +400,7 @@ static int balance_leaf(struct tree_balance *tb, struct item_head *ih,
switch (flag) {
case M_INSERT: /* insert item into L[0] */
if (tb->item_pos == tb->lnum[0] - 1 && tb->lbytes != -1) {
/* part of new item falls into L[0] */
int new_item_len;
int version;
ret_val = 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_val, ih, body,
tb->zeroes_num > ih_item_len(ih) ? ih_item_len(ih) : tb->zeroes_num);
version = ih_version(ih);
/* Calculate key component, item length and body to insert into S[0] */
set_le_ih_k_offset(ih, le_ih_k_offset(ih) +
(tb-> lbytes << (is_indirect_le_ih(ih) ? tb->tb_sb-> s_blocksize_bits - UNFM_P_SHIFT : 0)));
put_ih_item_len(ih, new_item_len);
if (tb->lbytes > tb->zeroes_num) {
body += (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_val = 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_val, ih, body, tb->zeroes_num);
tb->insert_size[0] = 0;
tb->zeroes_num = 0;
}
balance_leaf_insert_left(tb, ih, body);
break;
case M_PASTE: /* append item in L[0] */