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reiserfs: balance_leaf refactor, pull out balance_leaf_new_nodes_insert 

This patch factors out a new balance_leaf_new_nodes_insert from the code
in balance_leaf responsible for inserting new items into new nodes in
the tree.

It has not been reformatted yet.

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 10:00:51 -04:00 committed by Jan Kara
parent 3f0eb27655
commit 65ab18cb73
1 changed files with 73 additions and 60 deletions
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133
fs/reiserfs/do_balan.c
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@ -733,6 +733,77 @@ static void balance_leaf_paste_right(struct tree_balance *tb,
}
static void balance_leaf_new_nodes_insert(struct tree_balance *tb,
struct item_head *ih,
const char *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;
if (n - tb->snum[i] < tb->item_pos) { /* new item or it's part falls to first new node S_new[i] */
if (tb->item_pos == n - tb->snum[i] + 1 && tb->sbytes[i] != -1) { /* part of new item falls into S_new[i] */
int old_key_comp, old_len, r_zeroes_number;
const char *r_body;
int version;
/* 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 */
version = ih_version(ih);
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] */
set_le_ih_k_offset(ih, le_ih_k_offset(ih) +
((old_len - tb->sbytes[i]) << (is_indirect_le_ih(ih) ? tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT : 0)));
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]);
leaf_insert_into_buf(&bi, tb->item_pos - n + tb->snum[i] - 1,
ih, body, tb->zeroes_num);
tb->zeroes_num = tb->insert_size[0] = 0;
}
}
else { /* new item or it part don't falls into S_new[i] */
leaf_move_items(LEAF_FROM_S_TO_SNEW, tb,
tb->snum[i], tb->sbytes[i], tb->S_new[i]);
}
}
/**
* balance_leaf - reiserfs tree balancing algorithm
* @tb: tree balance state
@ -877,66 +948,8 @@ static int balance_leaf(struct tree_balance *tb, struct item_head *ih,
switch (flag) {
case M_INSERT: /* insert item */
if (n - tb->snum[i] < tb->item_pos) { /* new item or it's part falls to first new node S_new[i] */
if (tb->item_pos == n - tb->snum[i] + 1 && tb->sbytes[i] != -1) { /* part of new item falls into S_new[i] */
int old_key_comp, old_len, r_zeroes_number;
const char *r_body;
int version;
/* 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 */
version = ih_version(ih);
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] */
set_le_ih_k_offset(ih, le_ih_k_offset(ih) +
((old_len - tb->sbytes[i]) << (is_indirect_le_ih(ih) ? tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT : 0)));
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]);
leaf_insert_into_buf(&bi, tb->item_pos - n + tb->snum[i] - 1,
ih, body, tb->zeroes_num);
tb->zeroes_num = tb->insert_size[0] = 0;
}
}
else { /* new item or it part don't falls into S_new[i] */
leaf_move_items(LEAF_FROM_S_TO_SNEW, tb,
tb->snum[i], tb->sbytes[i], tb->S_new[i]);
}
balance_leaf_new_nodes_insert(tb, ih, body, insert_key,
insert_ptr, i);
break;
case M_PASTE: /* append item */