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reiserfs: balance_leaf refactor, format balance_leaf_paste_right

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Break up balance_leaf_paste_right into:
balance_leaf_paste_right_shift
balance_leaf_paste_right_shift_dirent
balance_leaf_paste_right_whole

and keep balance_leaf_paste_right as a handler to select which is appropriate.

Also reformat to adhere to CodingStyle.

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 10:00:59 -04:00 committed by Jan Kara
parent 8dbf0d8c9b
commit 2369ecd8e8
1 changed files with 184 additions and 144 deletions
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328
fs/reiserfs/do_balan.c
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@ -706,155 +706,197 @@ static void balance_leaf_insert_right(struct tree_balance *tb,
}
}
static void balance_leaf_paste_right_shift_dirent(struct tree_balance *tb,
struct item_head *ih, const char *body)
{
struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
struct buffer_info bi;
int entry_count;
RFALSE(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 *ih, const char *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(pos_in_item != ih_item_len(item_head(tbS0, item_pos)),
"PAP-12155: invalid position to paste. ih_item_len=%d, "
"pos_in_item=%d", pos_in_item,
ih_item_len(item_head(tbS0, 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 *ih, const char *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 *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 ret_val;
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 */
int entry_count;
/* 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;
}
RFALSE(tb->zeroes_num,
"PAP-12145: invalid parameter in case of a directory");
entry_count = ih_entry_count(item_head
(tbS0, tb->item_pos));
if (entry_count - tb->rbytes <
tb->pos_in_item)
/* new directory entry falls into R[0] */
{
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]);
if (paste_entry_position == 0) {
/* change delimiting keys */
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);
}
} else { /* regular object */
int n_shift, n_rem, r_zeroes_number;
const char *r_body;
/* Calculate number of bytes which must be shifted from appended item */
if ((n_shift = tb->rbytes - tb->insert_size[0]) < 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] */
if ((n_rem = tb->insert_size[0] - tb->rbytes) < 0)
n_rem = 0;
{
int version;
unsigned long 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))) {
temp_rem = n_rem << (tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT);
}
set_le_key_k_offset(version, leaf_key(tb->R[0], 0),
le_key_k_offset(version, leaf_key(tb->R[0], 0)) + temp_rem);
set_le_key_k_offset(version, internal_key(tb->CFR[0], tb->rkey[0]),
le_key_k_offset(version, internal_key(tb->CFR[0], tb->rkey[0])) + temp_rem);
}
/* k_offset (leaf_key(tb->R[0],0)) += n_rem;
k_offset (internal_key(tb->CFR[0],tb->rkey[0])) += n_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))) {
#if 0
RFALSE(n_rem,
"PAP-12160: paste more than one unformatted node pointer");
#endif
set_ih_free_space(item_head(tb->R[0], 0), 0);
}
tb->insert_size[0] = n_rem;
if (!n_rem)
tb->pos_in_item++;
}
} else { /* pasted item in whole falls into R[0] */
struct item_head *pasted;
ret_val = 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;
}
} else { /* new item doesn't fall into R[0] */
leaf_shift_right(tb, tb->rnum[0], tb->rbytes);
}
/* 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] */
@ -870,7 +912,6 @@ static void balance_leaf_right(struct tree_balance *tb, struct item_head *ih,
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,
@ -1083,8 +1124,7 @@ static void balance_leaf_new_nodes_paste(struct tree_balance *tb,
tb->pos_in_item, 1,
(struct reiserfs_de_head *)body,
body + DEH_SIZE,
tb->insert_size[0]
);
tb->insert_size[0]);
}
/* if we paste to indirect item update ih_free_space */