reiserfs: balance_leaf refactor, format balance_leaf_new_nodes_paste
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@suse.com> Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jeff Mahoney
Jan Kara
parent
2369ecd8e8
commit
b54b8c9184
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@ -714,7 +714,7 @@ static void balance_leaf_paste_right_shift_dirent(struct tree_balance *tb,
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struct buffer_info bi;
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int entry_count;
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RFALSE(zeroes_num,
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RFALSE(tb->zeroes_num,
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"PAP-12145: invalid parameter in case of a directory");
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entry_count = ih_entry_count(item_head(tbS0, tb->item_pos));
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@ -782,10 +782,10 @@ static void balance_leaf_paste_right_shift(struct tree_balance *tb,
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if (n_shift < 0)
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n_shift = 0;
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RFALSE(pos_in_item != ih_item_len(item_head(tbS0, item_pos)),
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RFALSE(tb->pos_in_item != ih_item_len(item_head(tbS0, tb->item_pos)),
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"PAP-12155: invalid position to paste. ih_item_len=%d, "
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"pos_in_item=%d", pos_in_item,
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ih_item_len(item_head(tbS0, item_pos)));
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"pos_in_item=%d", tb->pos_in_item,
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ih_item_len(item_head(tbS0, tb->item_pos)));
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leaf_shift_right(tb, tb->rnum[0], n_shift);
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@ -924,67 +924,269 @@ static void balance_leaf_new_nodes_insert(struct tree_balance *tb,
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struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
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int n = B_NR_ITEMS(tbS0);
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struct buffer_info bi;
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if (n - tb->snum[i] < tb->item_pos) { /* new item or it's part falls to first new node S_new[i] */
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if (tb->item_pos == n - tb->snum[i] + 1 && tb->sbytes[i] != -1) { /* part of new item falls into S_new[i] */
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int old_key_comp, old_len, r_zeroes_number;
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const char *r_body;
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int version;
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int shift;
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/* Move snum[i]-1 items from S[0] to S_new[i] */
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leaf_move_items(LEAF_FROM_S_TO_SNEW, tb,
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tb->snum[i] - 1, -1,
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tb->S_new[i]);
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/* Remember key component and item length */
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version = ih_version(ih);
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old_key_comp = le_ih_k_offset(ih);
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old_len = ih_item_len(ih);
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/* new item or it part don't falls into S_new[i] */
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if (n - tb->snum[i] >= tb->item_pos) {
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leaf_move_items(LEAF_FROM_S_TO_SNEW, tb,
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tb->snum[i], tb->sbytes[i], tb->S_new[i]);
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return;
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}
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/* Calculate key component and item length to insert into S_new[i] */
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set_le_ih_k_offset(ih, le_ih_k_offset(ih) +
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((old_len - tb->sbytes[i]) << (is_indirect_le_ih(ih) ? tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT : 0)));
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/* new item or it's part falls to first new node S_new[i] */
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put_ih_item_len(ih, tb->sbytes[i]);
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/* part of new item falls into S_new[i] */
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if (tb->item_pos == n - tb->snum[i] + 1 && tb->sbytes[i] != -1) {
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int old_key_comp, old_len, r_zeroes_number;
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const char *r_body;
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int version;
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/* Insert part of the item into S_new[i] before 0-th item */
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buffer_info_init_bh(tb, &bi, tb->S_new[i]);
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/* Move snum[i]-1 items from S[0] to S_new[i] */
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leaf_move_items(LEAF_FROM_S_TO_SNEW, tb, tb->snum[i] - 1, -1,
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tb->S_new[i]);
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if ((old_len - tb->sbytes[i]) > tb->zeroes_num) {
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r_zeroes_number = 0;
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r_body = body + (old_len - tb->sbytes[i]) - tb->zeroes_num;
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} else {
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r_body = body;
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r_zeroes_number = tb->zeroes_num - (old_len - tb->sbytes[i]);
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tb->zeroes_num -= r_zeroes_number;
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}
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/* Remember key component and item length */
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version = ih_version(ih);
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old_key_comp = le_ih_k_offset(ih);
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old_len = ih_item_len(ih);
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leaf_insert_into_buf(&bi, 0, ih, r_body, r_zeroes_number);
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/*
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* Calculate key component and item length to insert
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* into S_new[i]
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*/
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shift = 0;
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if (is_indirect_le_ih(ih))
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shift = tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT;
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set_le_ih_k_offset(ih,
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le_ih_k_offset(ih) +
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((old_len - tb->sbytes[i]) << shift));
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/* Calculate key component and item length to insert into S[i] */
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set_le_ih_k_offset(ih, old_key_comp);
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put_ih_item_len(ih, old_len - tb->sbytes[i]);
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tb->insert_size[0] -= tb->sbytes[i];
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} else { /* whole new item falls into S_new[i] */
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put_ih_item_len(ih, tb->sbytes[i]);
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/* Shift snum[0] - 1 items to S_new[i] (sbytes[i] of split item) */
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leaf_move_items(LEAF_FROM_S_TO_SNEW, tb,
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tb->snum[i] - 1, tb->sbytes[i], tb->S_new[i]);
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/* Insert part of the item into S_new[i] before 0-th item */
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buffer_info_init_bh(tb, &bi, tb->S_new[i]);
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/* Insert new item into S_new[i] */
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buffer_info_init_bh(tb, &bi, tb->S_new[i]);
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leaf_insert_into_buf(&bi, tb->item_pos - n + tb->snum[i] - 1,
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ih, body, tb->zeroes_num);
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if ((old_len - tb->sbytes[i]) > tb->zeroes_num) {
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r_zeroes_number = 0;
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r_body = body + (old_len - tb->sbytes[i]) -
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tb->zeroes_num;
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} else {
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r_body = body;
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r_zeroes_number = tb->zeroes_num - (old_len -
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tb->sbytes[i]);
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tb->zeroes_num -= r_zeroes_number;
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}
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tb->zeroes_num = tb->insert_size[0] = 0;
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}
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}
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leaf_insert_into_buf(&bi, 0, ih, r_body, r_zeroes_number);
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else { /* new item or it part don't falls into S_new[i] */
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/*
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* Calculate key component and item length to
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* insert into S[i]
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*/
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set_le_ih_k_offset(ih, old_key_comp);
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put_ih_item_len(ih, old_len - tb->sbytes[i]);
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tb->insert_size[0] -= tb->sbytes[i];
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} else {
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/* whole new item falls into S_new[i] */
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leaf_move_items(LEAF_FROM_S_TO_SNEW, tb,
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tb->snum[i], tb->sbytes[i], tb->S_new[i]);
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}
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/*
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* Shift snum[0] - 1 items to S_new[i]
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* (sbytes[i] of split item)
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*/
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leaf_move_items(LEAF_FROM_S_TO_SNEW, tb,
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tb->snum[i] - 1, tb->sbytes[i], tb->S_new[i]);
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/* Insert new item into S_new[i] */
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buffer_info_init_bh(tb, &bi, tb->S_new[i]);
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leaf_insert_into_buf(&bi, tb->item_pos - n + tb->snum[i] - 1,
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ih, body, tb->zeroes_num);
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tb->zeroes_num = tb->insert_size[0] = 0;
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}
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}
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/* we append to directory item */
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static void balance_leaf_new_nodes_paste_dirent(struct tree_balance *tb,
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struct item_head *ih,
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const char *body,
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struct item_head *insert_key,
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struct buffer_head **insert_ptr,
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int i)
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{
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struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
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struct item_head *aux_ih = item_head(tbS0, tb->item_pos);
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int entry_count = ih_entry_count(aux_ih);
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struct buffer_info bi;
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if (entry_count - tb->sbytes[i] < tb->pos_in_item &&
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tb->pos_in_item <= entry_count) {
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/* new directory entry falls into S_new[i] */
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RFALSE(!tb->insert_size[0],
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"PAP-12215: insert_size is already 0");
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RFALSE(tb->sbytes[i] - 1 >= entry_count,
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"PAP-12220: there are no so much entries (%d), only %d",
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tb->sbytes[i] - 1, entry_count);
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/*
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* Shift snum[i]-1 items in whole.
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* Shift sbytes[i] directory entries
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* from directory item number snum[i]
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*/
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leaf_move_items(LEAF_FROM_S_TO_SNEW, tb, tb->snum[i],
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tb->sbytes[i] - 1, tb->S_new[i]);
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/*
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* Paste given directory entry to
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* directory item
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*/
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buffer_info_init_bh(tb, &bi, tb->S_new[i]);
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leaf_paste_in_buffer(&bi, 0, tb->pos_in_item - entry_count +
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tb->sbytes[i] - 1, tb->insert_size[0],
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body, tb->zeroes_num);
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/* paste new directory entry */
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leaf_paste_entries(&bi, 0, tb->pos_in_item - entry_count +
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tb->sbytes[i] - 1, 1,
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(struct reiserfs_de_head *) body,
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body + DEH_SIZE, tb->insert_size[0]);
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tb->insert_size[0] = 0;
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tb->pos_in_item++;
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} else {
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/* new directory entry doesn't fall into S_new[i] */
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leaf_move_items(LEAF_FROM_S_TO_SNEW, tb, tb->snum[i],
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tb->sbytes[i], tb->S_new[i]);
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}
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}
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static void balance_leaf_new_nodes_paste_shift(struct tree_balance *tb,
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struct item_head *ih,
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const char *body,
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struct item_head *insert_key,
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struct buffer_head **insert_ptr,
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int i)
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{
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struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
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struct item_head *aux_ih = item_head(tbS0, tb->item_pos);
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int n_shift, n_rem, r_zeroes_number, shift;
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const char *r_body;
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struct item_head *tmp;
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struct buffer_info bi;
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RFALSE(ih, "PAP-12210: ih must be 0");
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if (is_direntry_le_ih(aux_ih)) {
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balance_leaf_new_nodes_paste_dirent(tb, ih, body, insert_key,
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insert_ptr, i);
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return;
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}
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/* regular object */
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RFALSE(tb->pos_in_item != ih_item_len(item_head(tbS0, tb->item_pos)) ||
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tb->insert_size[0] <= 0,
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"PAP-12225: item too short or insert_size <= 0");
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/*
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* Calculate number of bytes which must be shifted from appended item
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*/
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n_shift = tb->sbytes[i] - tb->insert_size[0];
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if (n_shift < 0)
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n_shift = 0;
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leaf_move_items(LEAF_FROM_S_TO_SNEW, tb, tb->snum[i], n_shift,
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tb->S_new[i]);
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/*
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* Calculate number of bytes which must remain in body after
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* append to S_new[i]
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*/
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n_rem = tb->insert_size[0] - tb->sbytes[i];
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if (n_rem < 0)
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n_rem = 0;
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/* Append part of body into S_new[0] */
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buffer_info_init_bh(tb, &bi, tb->S_new[i]);
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if (n_rem > tb->zeroes_num) {
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r_zeroes_number = 0;
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r_body = body + n_rem - tb->zeroes_num;
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} else {
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r_body = body;
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r_zeroes_number = tb->zeroes_num - n_rem;
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tb->zeroes_num -= r_zeroes_number;
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}
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leaf_paste_in_buffer(&bi, 0, n_shift, tb->insert_size[0] - n_rem,
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r_body, r_zeroes_number);
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tmp = item_head(tb->S_new[i], 0);
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shift = 0;
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if (is_indirect_le_ih(tmp)) {
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set_ih_free_space(tmp, 0);
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shift = tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT;
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}
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add_le_ih_k_offset(tmp, n_rem << shift);
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tb->insert_size[0] = n_rem;
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if (!n_rem)
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tb->pos_in_item++;
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}
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static void balance_leaf_new_nodes_paste_whole(struct tree_balance *tb,
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struct item_head *ih,
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const char *body,
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struct item_head *insert_key,
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struct buffer_head **insert_ptr,
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int i)
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{
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struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
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int n = B_NR_ITEMS(tbS0);
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int leaf_mi;
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struct item_head *pasted;
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struct buffer_info bi;
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#ifdef CONFIG_REISERFS_CHECK
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struct item_head *ih_check = item_head(tbS0, tb->item_pos);
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if (!is_direntry_le_ih(ih_check) &&
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(tb->pos_in_item != ih_item_len(ih_check) ||
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tb->insert_size[0] <= 0))
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reiserfs_panic(tb->tb_sb,
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"PAP-12235",
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"pos_in_item must be equal to ih_item_len");
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#endif
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leaf_mi = leaf_move_items(LEAF_FROM_S_TO_SNEW, tb, tb->snum[i],
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tb->sbytes[i], tb->S_new[i]);
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RFALSE(leaf_mi,
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"PAP-12240: unexpected value returned by leaf_move_items (%d)",
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leaf_mi);
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/* paste into item */
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buffer_info_init_bh(tb, &bi, tb->S_new[i]);
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leaf_paste_in_buffer(&bi, tb->item_pos - n + tb->snum[i],
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tb->pos_in_item, tb->insert_size[0],
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body, tb->zeroes_num);
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pasted = item_head(tb->S_new[i], tb->item_pos - n +
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tb->snum[i]);
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if (is_direntry_le_ih(pasted))
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leaf_paste_entries(&bi, tb->item_pos - n + tb->snum[i],
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tb->pos_in_item, 1,
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(struct reiserfs_de_head *)body,
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body + DEH_SIZE, tb->insert_size[0]);
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/* if we paste to indirect item update ih_free_space */
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if (is_indirect_le_ih(pasted))
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set_ih_free_space(pasted, 0);
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tb->zeroes_num = tb->insert_size[0] = 0;
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}
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static void balance_leaf_new_nodes_paste(struct tree_balance *tb,
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struct item_head *ih,
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const char *body,
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@ -994,152 +1196,24 @@ static void balance_leaf_new_nodes_paste(struct tree_balance *tb,
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{
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struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
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int n = B_NR_ITEMS(tbS0);
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struct buffer_info bi;
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if (n - tb->snum[i] <= tb->item_pos) { /* pasted item or part if it falls to S_new[i] */
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if (tb->item_pos == n - tb->snum[i] && tb->sbytes[i] != -1) { /* we must shift part of the appended item */
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struct item_head *aux_ih;
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RFALSE(ih, "PAP-12210: ih must be 0");
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/* pasted item doesn't fall into S_new[i] */
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if (n - tb->snum[i] > tb->item_pos) {
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leaf_move_items(LEAF_FROM_S_TO_SNEW, tb,
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tb->snum[i], tb->sbytes[i], tb->S_new[i]);
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return;
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}
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aux_ih = item_head(tbS0, tb->item_pos);
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if (is_direntry_le_ih(aux_ih)) {
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/* we append to directory item */
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int entry_count;
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entry_count = ih_entry_count(aux_ih);
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if (entry_count - tb->sbytes[i] < tb->pos_in_item && tb->pos_in_item <= entry_count) {
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/* new directory entry falls into S_new[i] */
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RFALSE(!tb->insert_size[0], "PAP-12215: insert_size is already 0");
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RFALSE(tb->sbytes[i] - 1 >= entry_count,
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"PAP-12220: there are no so much entries (%d), only %d",
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tb->sbytes[i] - 1, entry_count);
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/* Shift snum[i]-1 items in whole. Shift sbytes[i] directory entries from directory item number snum[i] */
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leaf_move_items(LEAF_FROM_S_TO_SNEW, tb, tb->snum[i], tb->sbytes[i] - 1, tb->S_new[i]);
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/* Paste given directory entry to directory item */
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buffer_info_init_bh(tb, &bi, tb->S_new[i]);
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leaf_paste_in_buffer(&bi, 0, tb->pos_in_item - entry_count + tb->sbytes[i] - 1,
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tb->insert_size[0], body, tb->zeroes_num);
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/* paste new directory entry */
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leaf_paste_entries(&bi, 0, tb->pos_in_item - entry_count + tb->sbytes[i] - 1, 1,
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(struct reiserfs_de_head *) body,
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body + DEH_SIZE, tb->insert_size[0]);
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tb->insert_size[0] = 0;
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tb->pos_in_item++;
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} else { /* new directory entry doesn't fall into S_new[i] */
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leaf_move_items(LEAF_FROM_S_TO_SNEW, tb, tb->snum[i], tb->sbytes[i], tb->S_new[i]);
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}
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} else { /* regular object */
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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);
|
||||
|
||||
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]);
|
||||
}
|
||||
/* 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] */
|
||||
|
|
@ -1152,6 +1226,7 @@ static void balance_leaf_new_nodes(struct tree_balance *tb,
|
|||
{
|
||||
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(struct tree_balance *tb,
|
|||
/* 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];
|
||||
|
|
|
|||
Loading…
Reference in New Issue