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https://github.com/torvalds/linux
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reiserfs: balance_leaf refactor, format balance_leaf_paste_left
Break up balance_leaf_paste_left into: balance_leaf_paste_left_shift balance_leaf_paste_left_shift_dirent balance_leaf_paste_left_whole and keep balance_leaf_paste_left 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
4bf4de6bc4
commit
3fade9377f
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@ -355,164 +355,247 @@ static void balance_leaf_insert_left(struct tree_balance *tb,
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}
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}
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static void balance_leaf_paste_left_shift_dirent(struct tree_balance *tb,
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struct item_head *ih,
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const char *body)
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{
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int n = B_NR_ITEMS(tb->L[0]);
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struct buffer_info bi;
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RFALSE(tb->zeroes_num,
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"PAP-12090: invalid parameter in case of a directory");
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/* directory item */
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if (tb->lbytes > tb->pos_in_item) {
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/* new directory entry falls into L[0] */
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struct item_head *pasted;
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int ret, l_pos_in_item = tb->pos_in_item;
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/*
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* Shift lnum[0] - 1 items in whole.
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* Shift lbytes - 1 entries from given directory item
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*/
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ret = leaf_shift_left(tb, tb->lnum[0], tb->lbytes - 1);
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if (ret && !tb->item_pos) {
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pasted = item_head(tb->L[0], B_NR_ITEMS(tb->L[0]) - 1);
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l_pos_in_item += ih_entry_count(pasted) -
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(tb->lbytes - 1);
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}
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/* Append given directory entry to directory item */
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buffer_info_init_left(tb, &bi);
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leaf_paste_in_buffer(&bi, n + tb->item_pos - ret,
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l_pos_in_item, tb->insert_size[0],
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body, tb->zeroes_num);
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/*
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* previous string prepared space for pasting new entry,
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* following string pastes this entry
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*/
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/*
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* when we have merge directory item, pos_in_item
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* has been changed too
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*/
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/* paste new directory entry. 1 is entry number */
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leaf_paste_entries(&bi, n + tb->item_pos - ret,
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l_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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tb->insert_size[0] = 0;
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} else {
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/* new directory item doesn't fall into L[0] */
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/*
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* Shift lnum[0]-1 items in whole. Shift lbytes
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* directory entries from directory item number lnum[0]
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*/
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leaf_shift_left(tb, tb->lnum[0], tb->lbytes);
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}
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/* Calculate new position to append in item body */
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tb->pos_in_item -= tb->lbytes;
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}
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static void balance_leaf_paste_left_shift(struct tree_balance *tb,
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struct item_head *ih,
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const char *body)
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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(tb->L[0]);
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struct buffer_info bi;
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if (is_direntry_le_ih(item_head(tbS0, tb->item_pos))) {
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balance_leaf_paste_left_shift_dirent(tb, ih, body);
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return;
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}
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RFALSE(tb->lbytes <= 0,
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"PAP-12095: there is nothing to shift to L[0]. "
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"lbytes=%d", tb->lbytes);
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RFALSE(tb->pos_in_item != ih_item_len(item_head(tbS0, tb->item_pos)),
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"PAP-12100: incorrect position to paste: "
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"item_len=%d, pos_in_item=%d",
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ih_item_len(item_head(tbS0, tb->item_pos)), tb->pos_in_item);
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/* appended item will be in L[0] in whole */
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if (tb->lbytes >= tb->pos_in_item) {
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struct item_head *tbS0_pos_ih, *tbL0_ih;
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struct item_head *tbS0_0_ih;
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struct reiserfs_key *left_delim_key;
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int ret, l_n, version, temp_l;
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tbS0_pos_ih = item_head(tbS0, tb->item_pos);
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tbS0_0_ih = item_head(tbS0, 0);
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/*
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* this bytes number must be appended
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* to the last item of L[h]
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*/
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l_n = tb->lbytes - tb->pos_in_item;
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/* Calculate new insert_size[0] */
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tb->insert_size[0] -= l_n;
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RFALSE(tb->insert_size[0] <= 0,
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"PAP-12105: there is nothing to paste into "
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"L[0]. insert_size=%d", tb->insert_size[0]);
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ret = leaf_shift_left(tb, tb->lnum[0],
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ih_item_len(tbS0_pos_ih));
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tbL0_ih = item_head(tb->L[0], n + tb->item_pos - ret);
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/* Append to body of item in L[0] */
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buffer_info_init_left(tb, &bi);
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leaf_paste_in_buffer(&bi, n + tb->item_pos - ret,
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ih_item_len(tbL0_ih), l_n, body,
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min_t(int, l_n, tb->zeroes_num));
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/*
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* 0-th item in S0 can be only of DIRECT type
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* when l_n != 0
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*/
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temp_l = l_n;
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RFALSE(ih_item_len(tbS0_0_ih),
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"PAP-12106: item length must be 0");
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RFALSE(comp_short_le_keys(&tbS0_0_ih->ih_key,
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leaf_key(tb->L[0], n + tb->item_pos - ret)),
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"PAP-12107: items must be of the same file");
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if (is_indirect_le_ih(tbL0_ih)) {
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int shift = tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT;
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temp_l = l_n << shift;
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}
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/* update key of first item in S0 */
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version = ih_version(tbS0_0_ih);
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add_le_key_k_offset(version, &tbS0_0_ih->ih_key, temp_l);
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/* update left delimiting key */
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left_delim_key = internal_key(tb->CFL[0], tb->lkey[0]);
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add_le_key_k_offset(version, left_delim_key, temp_l);
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/*
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* Calculate new body, position in item and
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* insert_size[0]
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*/
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if (l_n > tb->zeroes_num) {
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body += (l_n - tb->zeroes_num);
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tb->zeroes_num = 0;
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} else
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tb->zeroes_num -= l_n;
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tb->pos_in_item = 0;
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RFALSE(comp_short_le_keys(&tbS0_0_ih->ih_key,
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leaf_key(tb->L[0],
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B_NR_ITEMS(tb->L[0]) - 1)) ||
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!op_is_left_mergeable(leaf_key(tbS0, 0), tbS0->b_size) ||
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!op_is_left_mergeable(left_delim_key, tbS0->b_size),
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"PAP-12120: item must be merge-able with left "
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"neighboring item");
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} else {
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/* only part of the appended item will be in L[0] */
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/* Calculate position in item for append in S[0] */
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tb->pos_in_item -= tb->lbytes;
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RFALSE(tb->pos_in_item <= 0,
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"PAP-12125: no place for paste. pos_in_item=%d",
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tb->pos_in_item);
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/*
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* Shift lnum[0] - 1 items in whole.
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* Shift lbytes - 1 byte from item number lnum[0]
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*/
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leaf_shift_left(tb, tb->lnum[0], tb->lbytes);
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}
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}
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/* appended item will be in L[0] in whole */
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static void balance_leaf_paste_left_whole(struct tree_balance *tb,
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struct item_head *ih,
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const char *body)
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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(tb->L[0]);
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struct buffer_info bi;
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struct item_head *pasted;
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int ret;
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/* if we paste into first item of S[0] and it is left mergable */
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if (!tb->item_pos &&
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op_is_left_mergeable(leaf_key(tbS0, 0), tbS0->b_size)) {
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/*
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* then increment pos_in_item by the size of the
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* last item in L[0]
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*/
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pasted = item_head(tb->L[0], n - 1);
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if (is_direntry_le_ih(pasted))
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tb->pos_in_item += ih_entry_count(pasted);
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else
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tb->pos_in_item += ih_item_len(pasted);
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}
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/*
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* Shift lnum[0] - 1 items in whole.
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* Shift lbytes - 1 byte from item number lnum[0]
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*/
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ret = leaf_shift_left(tb, tb->lnum[0], tb->lbytes);
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/* Append to body of item in L[0] */
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buffer_info_init_left(tb, &bi);
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leaf_paste_in_buffer(&bi, n + tb->item_pos - ret, tb->pos_in_item,
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tb->insert_size[0], body, tb->zeroes_num);
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/* if appended item is directory, paste entry */
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pasted = item_head(tb->L[0], n + tb->item_pos - ret);
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if (is_direntry_le_ih(pasted))
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leaf_paste_entries(&bi, n + tb->item_pos - ret,
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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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/*
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* if appended item is indirect item, put unformatted node
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* into un list
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*/
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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->insert_size[0] = 0;
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tb->zeroes_num = 0;
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}
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static void balance_leaf_paste_left(struct tree_balance *tb,
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struct item_head *ih, const char *body)
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{
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struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
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int ret_val;
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struct buffer_info bi;
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int n = B_NR_ITEMS(tb->L[0]);
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if (tb->item_pos == tb->lnum[0] - 1 && tb->lbytes != -1) {
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/* we must shift the part of the appended item */
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if (is_direntry_le_ih(item_head(tbS0, tb->item_pos))) {
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RFALSE(tb->zeroes_num,
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"PAP-12090: invalid parameter in case of a directory");
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/* directory item */
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if (tb->lbytes > tb->pos_in_item) {
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/* new directory entry falls into L[0] */
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struct item_head *pasted;
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int l_pos_in_item = tb->pos_in_item;
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/* Shift lnum[0] - 1 items in whole. Shift lbytes - 1 entries from given directory item */
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ret_val = leaf_shift_left(tb, tb->lnum[0], tb->lbytes-1);
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if (ret_val && !tb->item_pos) {
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pasted = item_head(tb->L[0], B_NR_ITEMS(tb->L[0]) - 1);
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l_pos_in_item += ih_entry_count(pasted) - (tb->lbytes -1);
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}
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/* Append given directory entry to directory item */
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buffer_info_init_left(tb, &bi);
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leaf_paste_in_buffer(&bi, n + tb->item_pos - ret_val, l_pos_in_item, tb->insert_size[0], body, tb->zeroes_num);
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/* previous string prepared space for pasting new entry, following string pastes this entry */
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/* when we have merge directory item, pos_in_item has been changed too */
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/* paste new directory entry. 1 is entry number */
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leaf_paste_entries(&bi, n + tb->item_pos - ret_val, l_pos_in_item,
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1, (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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} else {
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/* new directory item doesn't fall into L[0] */
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/* Shift lnum[0]-1 items in whole. Shift lbytes directory entries from directory item number lnum[0] */
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leaf_shift_left(tb, tb->lnum[0], tb->lbytes);
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}
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/* Calculate new position to append in item body */
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tb->pos_in_item -= tb->lbytes;
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} else {
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/* regular object */
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RFALSE(tb->lbytes <= 0, "PAP-12095: there is nothing to shift to L[0]. lbytes=%d", tb->lbytes);
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RFALSE(tb->pos_in_item != ih_item_len(item_head(tbS0, tb->item_pos)),
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"PAP-12100: incorrect position to paste: item_len=%d, pos_in_item=%d",
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ih_item_len(item_head(tbS0, tb->item_pos)), tb->pos_in_item);
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if (tb->lbytes >= tb->pos_in_item) {
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/* appended item will be in L[0] in whole */
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int l_n;
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/* this bytes number must be appended to the last item of L[h] */
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l_n = tb->lbytes - tb->pos_in_item;
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/* Calculate new insert_size[0] */
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tb->insert_size[0] -= l_n;
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RFALSE(tb->insert_size[0] <= 0,
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"PAP-12105: there is nothing to paste into L[0]. insert_size=%d",
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tb->insert_size[0]);
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ret_val = leaf_shift_left(tb, tb->lnum[0], ih_item_len
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(item_head(tbS0, tb->item_pos)));
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/* Append to body of item in L[0] */
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buffer_info_init_left(tb, &bi);
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leaf_paste_in_buffer
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(&bi, n + tb->item_pos - ret_val, ih_item_len
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(item_head(tb->L[0], n + tb->item_pos - ret_val)),
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l_n, body,
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tb->zeroes_num > l_n ? l_n : tb->zeroes_num);
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/* 0-th item in S0 can be only of DIRECT type when l_n != 0 */
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{
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int version;
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int temp_l = l_n;
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RFALSE(ih_item_len(item_head(tbS0, 0)),
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"PAP-12106: item length must be 0");
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RFALSE(comp_short_le_keys(leaf_key(tbS0, 0), leaf_key
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(tb->L[0], n + tb->item_pos - ret_val)),
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"PAP-12107: items must be of the same file");
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if (is_indirect_le_ih(item_head(tb->L[0], n + tb->item_pos - ret_val))) {
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temp_l = l_n << (tb->tb_sb-> s_blocksize_bits - UNFM_P_SHIFT);
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}
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/* update key of first item in S0 */
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version = ih_version(item_head(tbS0, 0));
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set_le_key_k_offset(version, leaf_key(tbS0, 0),
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le_key_k_offset(version,leaf_key(tbS0, 0)) + temp_l);
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/* update left delimiting key */
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set_le_key_k_offset(version, internal_key(tb->CFL[0], tb->lkey[0]),
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le_key_k_offset(version, internal_key(tb->CFL[0], tb->lkey[0])) + temp_l);
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}
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/* Calculate new body, position in item and insert_size[0] */
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if (l_n > tb->zeroes_num) {
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body += (l_n - tb->zeroes_num);
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tb->zeroes_num = 0;
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} else
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tb->zeroes_num -= l_n;
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tb->pos_in_item = 0;
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RFALSE(comp_short_le_keys(leaf_key(tbS0, 0), leaf_key(tb->L[0], B_NR_ITEMS(tb->L[0]) - 1))
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|| !op_is_left_mergeable(leaf_key(tbS0, 0), tbS0->b_size)
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|| !op_is_left_mergeable(internal_key(tb->CFL[0], tb->lkey[0]), tbS0->b_size),
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"PAP-12120: item must be merge-able with left neighboring item");
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} else { /* only part of the appended item will be in L[0] */
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/* Calculate position in item for append in S[0] */
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tb->pos_in_item -= tb->lbytes;
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RFALSE(tb->pos_in_item <= 0, "PAP-12125: no place for paste. pos_in_item=%d", tb->pos_in_item);
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/* Shift lnum[0] - 1 items in whole. Shift lbytes - 1 byte from item number lnum[0] */
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leaf_shift_left(tb, tb->lnum[0], tb->lbytes);
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}
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}
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} else { /* appended item will be in L[0] in whole */
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struct item_head *pasted;
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if (!tb->item_pos && op_is_left_mergeable(leaf_key(tbS0, 0), tbS0->b_size)) { /* if we paste into first item of S[0] and it is left mergable */
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/* then increment pos_in_item by the size of the last item in L[0] */
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pasted = item_head(tb->L[0], n - 1);
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if (is_direntry_le_ih(pasted))
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tb->pos_in_item += ih_entry_count(pasted);
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else
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tb->pos_in_item += ih_item_len(pasted);
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}
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/* Shift lnum[0] - 1 items in whole. Shift lbytes - 1 byte from item number lnum[0] */
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ret_val = leaf_shift_left(tb, tb->lnum[0], tb->lbytes);
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/* Append to body of item in L[0] */
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buffer_info_init_left(tb, &bi);
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leaf_paste_in_buffer(&bi, n + tb->item_pos - ret_val,
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tb->pos_in_item,
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tb->insert_size[0],
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body, tb->zeroes_num);
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/* if appended item is directory, paste entry */
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pasted = item_head(tb->L[0], n + tb->item_pos - ret_val);
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if (is_direntry_le_ih(pasted))
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leaf_paste_entries(&bi, n + tb->item_pos - ret_val,
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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,
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tb->insert_size[0]);
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/* if appended item is indirect item, put unformatted node into un list */
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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->insert_size[0] = 0;
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tb->zeroes_num = 0;
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}
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/* we must shift the part of the appended item */
|
||||
if (tb->item_pos == tb->lnum[0] - 1 && tb->lbytes != -1)
|
||||
balance_leaf_paste_left_shift(tb, ih, body);
|
||||
else
|
||||
balance_leaf_paste_left_whole(tb, ih, body);
|
||||
}
|
||||
|
||||
/* Shift lnum[0] items from S[0] to the left neighbor L[0] */
|
||||
|
|
|
|||
Loading…
Reference in a new issue