mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-02 07:04:24 +00:00
reiserfs: balance_leaf refactor, pull out balance_leaf_paste_right
This patch factors out a new balance_leaf_paste_right from the code in balance_leaf responsible for pasting new contents into an existing item located in the node to the right of S[0] 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
Jan Kara
parent
e80ef3d148
commit
3f0eb27655
1 changed files with 90 additions and 80 deletions
|
|
@ -582,91 +582,14 @@ static void balance_leaf_insert_right(struct tree_balance *tb,
|
|||
|
||||
}
|
||||
|
||||
/**
|
||||
* 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)
|
||||
static void balance_leaf_paste_right(struct tree_balance *tb,
|
||||
struct item_head *ih, const char *body)
|
||||
{
|
||||
struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
|
||||
int n = B_NR_ITEMS(tbS0);
|
||||
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;
|
||||
default: /* cases d and t */
|
||||
reiserfs_panic(tb->tb_sb, "PAP-12130",
|
||||
"lnum > 0: unexpected mode: "
|
||||
" %s(%d)",
|
||||
(flag == M_DELETE) ? "DELETE" : ((flag == M_CUT) ? "CUT" : "UNKNOWN"), flag);
|
||||
}
|
||||
} else {
|
||||
/* new item doesn't fall into L[0] */
|
||||
leaf_shift_left(tb, tb->lnum[0], tb->lbytes);
|
||||
}
|
||||
}
|
||||
|
||||
/* tb->lnum[0] > 0 */
|
||||
/* Calculate new item position */
|
||||
tb->item_pos -= (tb->lnum[0] - ((tb->lbytes != -1) ? 1 : 0));
|
||||
|
||||
if (tb->rnum[0] > 0) {
|
||||
/* shift rnum[0] items from S[0] to the right neighbor R[0] */
|
||||
n = B_NR_ITEMS(tbS0);
|
||||
switch (flag) {
|
||||
|
||||
case M_INSERT: /* insert item */
|
||||
balance_leaf_insert_right(tb, ih, body);
|
||||
break;
|
||||
|
||||
case M_PASTE: /* append item */
|
||||
|
||||
if (n - tb->rnum[0] <= tb->item_pos) { /* 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 */
|
||||
if (is_direntry_le_ih(item_head(tbS0, tb->item_pos))) { /* we append to directory item */
|
||||
|
|
@ -807,6 +730,93 @@ static int balance_leaf(struct tree_balance *tb, struct item_head *ih,
|
|||
|
||||
leaf_shift_right(tb, tb->rnum[0], tb->rbytes);
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
/**
|
||||
* 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;
|
||||
|
||||
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;
|
||||
default: /* cases d and t */
|
||||
reiserfs_panic(tb->tb_sb, "PAP-12130",
|
||||
"lnum > 0: unexpected mode: "
|
||||
" %s(%d)",
|
||||
(flag == M_DELETE) ? "DELETE" : ((flag == M_CUT) ? "CUT" : "UNKNOWN"), flag);
|
||||
}
|
||||
} else {
|
||||
/* new item doesn't fall into L[0] */
|
||||
leaf_shift_left(tb, tb->lnum[0], tb->lbytes);
|
||||
}
|
||||
}
|
||||
|
||||
/* tb->lnum[0] > 0 */
|
||||
/* Calculate new item position */
|
||||
tb->item_pos -= (tb->lnum[0] - ((tb->lbytes != -1) ? 1 : 0));
|
||||
|
||||
if (tb->rnum[0] > 0) {
|
||||
/* shift rnum[0] items from S[0] to the right neighbor R[0] */
|
||||
n = B_NR_ITEMS(tbS0);
|
||||
switch (flag) {
|
||||
|
||||
case M_INSERT: /* insert item */
|
||||
balance_leaf_insert_right(tb, ih, body);
|
||||
break;
|
||||
|
||||
case M_PASTE: /* append item */
|
||||
balance_leaf_paste_right(tb, ih, body);
|
||||
break;
|
||||
default: /* cases d and t */
|
||||
reiserfs_panic(tb->tb_sb, "PAP-12175",
|
||||
|
|
|
|||
Loading…
Reference in a new issue