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reiserfs: balance_leaf refactor, pull out balance_leaf_paste_left

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This patch factors out a new balance_leaf_paste_left from the code in
balance_leaf responsible for pasting new content into an existing item
located in the node to the left of S[0] in the tree.

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 10:00:48 -04:00 committed by Jan Kara
parent f1f007c308
commit cf22df182b
1 changed files with 64 additions and 53 deletions
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117
fs/reiserfs/do_balan.c
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@ -348,62 +348,13 @@ static void balance_leaf_insert_left(struct tree_balance *tb,
} }
/** static void balance_leaf_paste_left(struct tree_balance *tb,
* balance_leaf - reiserfs tree balancing algorithm struct item_head *ih, const char *body)
* @tb: tree balance state
* @ih: item header of inserted item (little endian)
* @body: body of inserted item or bytes to paste
* @flag: i - insert, d - delete, c - cut, p - paste (see do_balance)
* passed back:
* @insert_key: key to insert new nodes
* @insert_ptr: array of nodes to insert at the next level
*
* In our processing of one level we sometimes determine what must be
* inserted into the next higher level. This insertion consists of a
* key or two keys and their corresponding pointers.
*/
static int balance_leaf(struct tree_balance *tb, struct item_head *ih,
const char *body, int flag,
struct item_head *insert_key,
struct buffer_head **insert_ptr)
{ {
struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path); struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
struct buffer_info bi;
int n, i;
int ret_val; int ret_val;
struct buffer_info bi;
PROC_INFO_INC(tb->tb_sb, balance_at[0]); int n = B_NR_ITEMS(tb->L[0]);
/* Make balance in case insert_size[0] < 0 */
if (tb->insert_size[0] < 0)
return balance_leaf_when_delete(tb, flag);
tb->item_pos = PATH_LAST_POSITION(tb->tb_path),
tb->pos_in_item = tb->tb_path->pos_in_item,
tb->zeroes_num = 0;
if (flag == M_INSERT && !body)
tb->zeroes_num = ih_item_len(ih);
/*
* for indirect item pos_in_item is measured in unformatted node
* pointers. Recalculate to bytes
*/
if (flag != M_INSERT
&& is_indirect_le_ih(item_head(tbS0, tb->item_pos)))
tb->pos_in_item *= UNFM_P_SIZE;
if (tb->lnum[0] > 0) {
/* Shift lnum[0] items from S[0] to the left neighbor L[0] */
if (tb->item_pos < tb->lnum[0]) {
/* new item or it part falls to L[0], shift it too */
n = B_NR_ITEMS(tb->L[0]);
switch (flag) {
case M_INSERT: /* insert item into L[0] */
balance_leaf_insert_left(tb, ih, body);
break;
case M_PASTE: /* append item in L[0] */
if (tb->item_pos == tb->lnum[0] - 1 && tb->lbytes != -1) { if (tb->item_pos == tb->lnum[0] - 1 && tb->lbytes != -1) {
/* we must shift the part of the appended item */ /* we must shift the part of the appended item */
@ -554,6 +505,66 @@ static int balance_leaf(struct tree_balance *tb, struct item_head *ih,
tb->insert_size[0] = 0; tb->insert_size[0] = 0;
tb->zeroes_num = 0; tb->zeroes_num = 0;
} }
}
/**
* balance_leaf - reiserfs tree balancing algorithm
* @tb: tree balance state
* @ih: item header of inserted item (little endian)
* @body: body of inserted item or bytes to paste
* @flag: i - insert, d - delete, c - cut, p - paste (see do_balance)
* passed back:
* @insert_key: key to insert new nodes
* @insert_ptr: array of nodes to insert at the next level
*
* In our processing of one level we sometimes determine what must be
* inserted into the next higher level. This insertion consists of a
* key or two keys and their corresponding pointers.
*/
static int balance_leaf(struct tree_balance *tb, struct item_head *ih,
const char *body, int flag,
struct item_head *insert_key,
struct buffer_head **insert_ptr)
{
struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
struct buffer_info bi;
int n, i;
int ret_val;
PROC_INFO_INC(tb->tb_sb, balance_at[0]);
/* Make balance in case insert_size[0] < 0 */
if (tb->insert_size[0] < 0)
return balance_leaf_when_delete(tb, flag);
tb->item_pos = PATH_LAST_POSITION(tb->tb_path),
tb->pos_in_item = tb->tb_path->pos_in_item,
tb->zeroes_num = 0;
if (flag == M_INSERT && !body)
tb->zeroes_num = ih_item_len(ih);
/*
* for indirect item pos_in_item is measured in unformatted node
* pointers. Recalculate to bytes
*/
if (flag != M_INSERT
&& is_indirect_le_ih(item_head(tbS0, tb->item_pos)))
tb->pos_in_item *= UNFM_P_SIZE;
if (tb->lnum[0] > 0) {
/* Shift lnum[0] items from S[0] to the left neighbor L[0] */
if (tb->item_pos < tb->lnum[0]) {
/* new item or it part falls to L[0], shift it too */
n = B_NR_ITEMS(tb->L[0]);
switch (flag) {
case M_INSERT: /* insert item into L[0] */
balance_leaf_insert_left(tb, ih, body);
break;
case M_PASTE: /* append item in L[0] */
balance_leaf_paste_left(tb, ih, body);
break; break;
default: /* cases d and t */ default: /* cases d and t */
reiserfs_panic(tb->tb_sb, "PAP-12130", reiserfs_panic(tb->tb_sb, "PAP-12130",