Break up balance_leaf_paste_new_nodes into:
balance_leaf_paste_new_nodes_shift
balance_leaf_paste_new_nodes_shift_dirent
balance_leaf_paste_new_nodes_whole
and keep balance_leaf_paste_new_nodes as a handler to select which
is appropriate.
Also reformat to adhere to CodingStyle.
Signed-off-by: Jeff Mahoney <jeffm@xxxxxxxx>
---
fs/reiserfs/do_balan.c | 498 +++++++++++++++++++++++++++----------------------
1 file changed, 282 insertions(+), 216 deletions(-)
--- a/fs/reiserfs/do_balan.c
+++ b/fs/reiserfs/do_balan.c
@@ -714,7 +714,7 @@ static void balance_leaf_paste_right_shi
struct buffer_info bi;
int entry_count;
- RFALSE(zeroes_num,
+ RFALSE(tb->zeroes_num,
"PAP-12145: invalid parameter in case of a directory");
entry_count = ih_entry_count(item_head(tbS0, tb->item_pos));
@@ -782,10 +782,10 @@ static void balance_leaf_paste_right_shi
if (n_shift < 0)
n_shift = 0;
- RFALSE(pos_in_item != ih_item_len(item_head(tbS0, item_pos)),
+ 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", pos_in_item,
- ih_item_len(item_head(tbS0, item_pos)));
+ "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);
@@ -924,68 +924,144 @@ static void balance_leaf_new_nodes_inser
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]);
- }
+ int shift;
+
+ /* new item or it part don't falls into S_new[i] */
+ if (n - tb->snum[i] >= tb->item_pos) {
+ leaf_move_items(LEAF_FROM_S_TO_SNEW, tb,
+ tb->snum[i], tb->sbytes[i], tb->S_new[i]);
+ return;
+ }
+
+ /* new item or it's part falls to first new node S_new[i] */
+
+ /* part of new item falls into S_new[i] */
+ if (tb->item_pos == n - tb->snum[i] + 1 && tb->sbytes[i] != -1) {
+ 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]
+ */
+ shift = 0;
+ if (is_indirect_le_ih(ih))
+ shift = tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT;
+ set_le_ih_k_offset(ih,
+ le_ih_k_offset(ih) +
+ ((old_len - tb->sbytes[i]) << shift));
+
+ 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;
+ }
}
-static void balance_leaf_new_nodes_paste(struct tree_balance *tb,
+/* we append to directory item */
+static void balance_leaf_new_nodes_paste_dirent(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);
+ struct item_head *aux_ih = item_head(tbS0, tb->item_pos);
+ int entry_count = ih_entry_count(aux_ih);
+ struct buffer_info bi;
+
+ if (entry_count - tb->sbytes[i] < tb->pos_in_item &&
+ tb->pos_in_item <= entry_count) {
+ /* new directory entry falls into S_new[i] */
+
+ RFALSE(!tb->insert_size[0],
+ "PAP-12215: insert_size is already 0");
+ RFALSE(tb->sbytes[i] - 1 >= entry_count,
+ "PAP-12220: there are no so much entries (%d), only %d",
+ tb->sbytes[i] - 1, entry_count);
+
+ /*
+ * Shift snum[i]-1 items in whole.
+ * Shift sbytes[i] directory entries
+ * from directory item number snum[i]
+ */
+ leaf_move_items(LEAF_FROM_S_TO_SNEW, tb, tb->snum[i],
+ tb->sbytes[i] - 1, tb->S_new[i]);
+
+ /*
+ * Paste given directory entry to
+ * directory item
+ */
+ buffer_info_init_bh(tb, &bi, tb->S_new[i]);
+ leaf_paste_in_buffer(&bi, 0, tb->pos_in_item - entry_count +
+ tb->sbytes[i] - 1, tb->insert_size[0],
+ body, tb->zeroes_num);
+
+ /* paste new directory entry */
+ leaf_paste_entries(&bi, 0, tb->pos_in_item - entry_count +
+ tb->sbytes[i] - 1, 1,
+ (struct reiserfs_de_head *) body,
+ body + DEH_SIZE, tb->insert_size[0]);
+
+ tb->insert_size[0] = 0;
+ tb->pos_in_item++;
+ } else {
+ /* new directory entry doesn't fall into S_new[i] */
+ leaf_move_items(LEAF_FROM_S_TO_SNEW, tb, tb->snum[i],
+ tb->sbytes[i], tb->S_new[i]);
+ }
+
+}
+
+static void balance_leaf_new_nodes_paste_shift(struct tree_balance *tb,
struct item_head *ih,
const char *body,
struct item_head *insert_key,
@@ -993,154 +1069,152 @@ static void balance_leaf_new_nodes_paste
int i)
{
struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
+ struct item_head *aux_ih = item_head(tbS0, tb->item_pos);
+ int n_shift, n_rem, r_zeroes_number, shift;
+ const char *r_body;
+ struct item_head *tmp;
+ struct buffer_info bi;
+
+ RFALSE(ih, "PAP-12210: ih must be 0");
+
+ if (is_direntry_le_ih(aux_ih)) {
+ balance_leaf_new_nodes_paste_dirent(tb, ih, body, insert_key,
+ insert_ptr, i);
+ return;
+ }
+
+ /* regular object */
+
+
+ RFALSE(tb->pos_in_item != ih_item_len(item_head(tbS0, tb->item_pos)) ||
+ tb->insert_size[0] <= 0,
+ "PAP-12225: item too short or insert_size <= 0");
+
+ /*
+ * Calculate number of bytes which must be shifted from appended item
+ */
+ n_shift = tb->sbytes[i] - tb->insert_size[0];
+ if (n_shift < 0)
+ n_shift = 0;
+ leaf_move_items(LEAF_FROM_S_TO_SNEW, tb, tb->snum[i], n_shift,
+ tb->S_new[i]);
+
+ /*
+ * Calculate number of bytes which must remain in body after
+ * append to S_new[i]
+ */
+ n_rem = tb->insert_size[0] - tb->sbytes[i];
+ if (n_rem < 0)
+ n_rem = 0;
+
+ /* Append part of body into S_new[0] */
+ buffer_info_init_bh(tb, &bi, tb->S_new[i]);
+ 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);
+
+ tmp = item_head(tb->S_new[i], 0);
+ shift = 0;
+ if (is_indirect_le_ih(tmp)) {
+ set_ih_free_space(tmp, 0);
+ shift = tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT;
+ }
+ add_le_ih_k_offset(tmp, n_rem << shift);
+
+ tb->insert_size[0] = n_rem;
+ if (!n_rem)
+ tb->pos_in_item++;
+}
+
+static void balance_leaf_new_nodes_paste_whole(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);
+ int leaf_mi;
+ struct item_head *pasted;
struct buffer_info bi;
- if (n - tb->snum[i] <= tb->item_pos) { /* pasted item or part if it falls to S_new[i] */
- if (tb->item_pos == n - tb->snum[i] && tb->sbytes[i] != -1) { /* we must shift part of the appended item */
- struct item_head *aux_ih;
-
- RFALSE(ih, "PAP-12210: ih must be 0");
-
- aux_ih = item_head(tbS0, tb->item_pos);
- if (is_direntry_le_ih(aux_ih)) {
- /* we append to directory item */
-
- int entry_count;
-
- entry_count = ih_entry_count(aux_ih);
-
- if (entry_count - tb->sbytes[i] < tb->pos_in_item && tb->pos_in_item <= entry_count) {
- /* new directory entry falls into S_new[i] */
-
- RFALSE(!tb->insert_size[0], "PAP-12215: insert_size is already 0");
- RFALSE(tb->sbytes[i] - 1 >= entry_count,
- "PAP-12220: there are no so much entries (%d), only %d",
- tb->sbytes[i] - 1, entry_count);
-
- /* Shift snum[i]-1 items in whole. Shift sbytes[i] directory entries from directory item number snum[i] */
- leaf_move_items(LEAF_FROM_S_TO_SNEW, tb, tb->snum[i], tb->sbytes[i] - 1, tb->S_new[i]);
- /* Paste given directory entry to directory item */
- buffer_info_init_bh(tb, &bi, tb->S_new[i]);
- leaf_paste_in_buffer(&bi, 0, tb->pos_in_item - entry_count + tb->sbytes[i] - 1,
- tb->insert_size[0], body, tb->zeroes_num);
- /* paste new directory entry */
- leaf_paste_entries(&bi, 0, tb->pos_in_item - entry_count + tb->sbytes[i] - 1, 1,
- (struct reiserfs_de_head *) body,
- body + DEH_SIZE, tb->insert_size[0]);
- tb->insert_size[0] = 0;
- tb->pos_in_item++;
- } else { /* new directory entry doesn't fall into S_new[i] */
- leaf_move_items(LEAF_FROM_S_TO_SNEW, tb, tb->snum[i], tb->sbytes[i], tb->S_new[i]);
- }
- } else { /* regular object */
-
- int n_shift, n_rem, r_zeroes_number;
- const char *r_body;
-
- RFALSE(tb->pos_in_item != ih_item_len(item_head(tbS0, tb->item_pos)) || tb->insert_size[0] <= 0,
- "PAP-12225: item too short or insert_size <= 0");
-
- /* Calculate number of bytes which must be shifted from appended item */
- n_shift = tb->sbytes[i] - tb->insert_size[0];
- if (n_shift < 0)
- n_shift = 0;
- leaf_move_items(LEAF_FROM_S_TO_SNEW, tb, tb->snum[i], n_shift, tb->S_new[i]);
-
- /* Calculate number of bytes which must remain in body after append to S_new[i] */
- n_rem = tb->insert_size[0] - tb->sbytes[i];
- if (n_rem < 0)
- n_rem = 0;
- /* Append part of body into S_new[0] */
- buffer_info_init_bh(tb, &bi, tb->S_new[i]);
- 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);
- {
- struct item_head *tmp;
-
- tmp = item_head(tb->S_new[i], 0);
- if (is_indirect_le_ih
- (tmp)) {
- set_ih_free_space(tmp, 0);
- set_le_ih_k_offset(tmp, le_ih_k_offset(tmp) + (n_rem << (tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT)));
- } else {
- set_le_ih_k_offset(tmp, le_ih_k_offset(tmp) + n_rem);
- }
- }
-
- tb->insert_size[0] = n_rem;
- if (!n_rem)
- tb->pos_in_item++;
- }
- } else
- /* item falls wholly into S_new[i] */
- {
- int leaf_mi;
- struct item_head *pasted;
#ifdef CONFIG_REISERFS_CHECK
- struct item_head *ih_check = item_head(tbS0, tb->item_pos);
+ struct item_head *ih_check = item_head(tbS0, tb->item_pos);
- if (!is_direntry_le_ih(ih_check)
- && (tb->pos_in_item != ih_item_len(ih_check)
- || tb->insert_size[0] <= 0))
- reiserfs_panic(tb->tb_sb,
- "PAP-12235",
- "pos_in_item "
- "must be equal "
- "to ih_item_len");
-#endif /* CONFIG_REISERFS_CHECK */
-
- leaf_mi = leaf_move_items(LEAF_FROM_S_TO_SNEW,
- tb, tb->snum[i],
- tb->sbytes[i],
- tb->S_new[i]);
-
- RFALSE(leaf_mi,
- "PAP-12240: unexpected value returned by leaf_move_items (%d)",
- leaf_mi);
-
- /* paste into item */
- buffer_info_init_bh(tb, &bi, tb->S_new[i]);
- leaf_paste_in_buffer(&bi,
- tb->item_pos - n + tb->snum[i],
- tb->pos_in_item,
- tb->insert_size[0],
- body, tb->zeroes_num);
-
- pasted = item_head(tb->S_new[i], tb->item_pos - n + tb->snum[i]);
- if (is_direntry_le_ih(pasted)) {
- leaf_paste_entries(&bi,
- tb->item_pos - n + tb->snum[i],
- tb->pos_in_item, 1,
- (struct reiserfs_de_head *)body,
- body + DEH_SIZE,
- tb->insert_size[0]);
- }
-
- /* if we paste to indirect item update ih_free_space */
- if (is_indirect_le_ih(pasted))
- set_ih_free_space(pasted, 0);
- tb->zeroes_num = tb->insert_size[0] = 0;
- }
- }
-
- else { /* pasted item doesn't fall into S_new[i] */
-
- leaf_move_items(LEAF_FROM_S_TO_SNEW, tb,
- tb->snum[i], tb->sbytes[i], tb->S_new[i]);
- }
+ if (!is_direntry_le_ih(ih_check) &&
+ (tb->pos_in_item != ih_item_len(ih_check) ||
+ tb->insert_size[0] <= 0))
+ reiserfs_panic(tb->tb_sb,
+ "PAP-12235",
+ "pos_in_item must be equal to ih_item_len");
+#endif
+
+ leaf_mi = leaf_move_items(LEAF_FROM_S_TO_SNEW, tb, tb->snum[i],
+ tb->sbytes[i], tb->S_new[i]);
+
+ RFALSE(leaf_mi,
+ "PAP-12240: unexpected value returned by leaf_move_items (%d)",
+ leaf_mi);
+
+ /* paste into item */
+ buffer_info_init_bh(tb, &bi, tb->S_new[i]);
+ leaf_paste_in_buffer(&bi, tb->item_pos - n + tb->snum[i],
+ tb->pos_in_item, tb->insert_size[0],
+ body, tb->zeroes_num);
+
+ pasted = item_head(tb->S_new[i], tb->item_pos - n +
+ tb->snum[i]);
+ if (is_direntry_le_ih(pasted))
+ leaf_paste_entries(&bi, tb->item_pos - n + tb->snum[i],
+ tb->pos_in_item, 1,
+ (struct reiserfs_de_head *)body,
+ body + DEH_SIZE, tb->insert_size[0]);
+
+ /* if we paste to indirect item update ih_free_space */
+ if (is_indirect_le_ih(pasted))
+ set_ih_free_space(pasted, 0);
+
+ tb->zeroes_num = tb->insert_size[0] = 0;
}
+static void balance_leaf_new_nodes_paste(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);
+
+ /* pasted item doesn't fall into S_new[i] */
+ if (n - tb->snum[i] > tb->item_pos) {
+ leaf_move_items(LEAF_FROM_S_TO_SNEW, tb,
+ tb->snum[i], tb->sbytes[i], tb->S_new[i]);
+ return;
+ }
+
+ /* pasted item or part if it falls to S_new[i] */
+
+ if (tb->item_pos == n - tb->snum[i] && tb->sbytes[i] != -1)
+ /* we must shift part of the appended item */
+ balance_leaf_new_nodes_paste_shift(tb, ih, body, insert_key,
+ insert_ptr, i);
+ else
+ /* item falls wholly into S_new[i] */
+ balance_leaf_new_nodes_paste_whole(tb, ih, body, insert_key,
+ insert_ptr, i);
+}
/* Fill new nodes that appear in place of S[0] */
static void balance_leaf_new_nodes(struct tree_balance *tb,
@@ -1152,6 +1226,7 @@ static void balance_leaf_new_nodes(struc
{
int i;
for (i = tb->blknum[0] - 2; i >= 0; i--) {
+ BUG_ON(flag != M_INSERT && flag != M_PASTE);
RFALSE(!tb->snum[i],
"PAP-12200: snum[%d] == %d. Must be > 0", i,
@@ -1164,21 +1239,12 @@ static void balance_leaf_new_nodes(struc
/* initialized block type and tree level */
set_blkh_level(B_BLK_HEAD(tb->S_new[i]), DISK_LEAF_NODE_LEVEL);
- switch (flag) {
- case M_INSERT: /* insert item */
+ if (flag == M_INSERT)
balance_leaf_new_nodes_insert(tb, ih, body, insert_key,
insert_ptr, i);
- break;
-
- case M_PASTE: /* append item */
+ else /* M_PASTE */
balance_leaf_new_nodes_paste(tb, ih, body, insert_key,
insert_ptr, i);
- break;
- default: /* cases d and t */
- reiserfs_panic(tb->tb_sb, "PAP-12245",
- "blknum > 2: unexpected mode: %s(%d)",
- (flag == M_DELETE) ? "DELETE" : ((flag == M_CUT) ? "CUT" : "UNKNOWN"), flag);
- }
memcpy(insert_key + i, leaf_key(tb->S_new[i], 0), KEY_SIZE);
insert_ptr[i] = tb->S_new[i];
--
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