diff options
Diffstat (limited to 'fs/reiserfs/do_balan.c')
| -rw-r--r-- | fs/reiserfs/do_balan.c | 2449 |
1 files changed, 1388 insertions, 1061 deletions
diff --git a/fs/reiserfs/do_balan.c b/fs/reiserfs/do_balan.c index 9a3c68c..54fdf19 100644 --- a/fs/reiserfs/do_balan.c +++ b/fs/reiserfs/do_balan.c @@ -2,18 +2,13 @@ * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README */ -/* Now we have all buffers that must be used in balancing of the tree */ -/* Further calculations can not cause schedule(), and thus the buffer */ -/* tree will be stable until the balancing will be finished */ -/* balance the tree according to the analysis made before, */ -/* and using buffers obtained after all above. */ - -/** - ** balance_leaf_when_delete - ** balance_leaf - ** do_balance - ** - **/ +/* + * Now we have all buffers that must be used in balancing of the tree + * Further calculations can not cause schedule(), and thus the buffer + * tree will be stable until the balancing will be finished + * balance the tree according to the analysis made before, + * and using buffers obtained after all above. + */ #include <asm/uaccess.h> #include <linux/time.h> @@ -61,48 +56,190 @@ static inline void buffer_info_init_bh(struct tree_balance *tb, inline void do_balance_mark_leaf_dirty(struct tree_balance *tb, struct buffer_head *bh, int flag) { - journal_mark_dirty(tb->transaction_handle, - tb->transaction_handle->t_super, bh); + journal_mark_dirty(tb->transaction_handle, bh); } #define do_balance_mark_internal_dirty do_balance_mark_leaf_dirty #define do_balance_mark_sb_dirty do_balance_mark_leaf_dirty -/* summary: - if deleting something ( tb->insert_size[0] < 0 ) - return(balance_leaf_when_delete()); (flag d handled here) - else - if lnum is larger than 0 we put items into the left node - if rnum is larger than 0 we put items into the right node - if snum1 is larger than 0 we put items into the new node s1 - if snum2 is larger than 0 we put items into the new node s2 -Note that all *num* count new items being created. - -It would be easier to read balance_leaf() if each of these summary -lines was a separate procedure rather than being inlined. I think -that there are many passages here and in balance_leaf_when_delete() in -which two calls to one procedure can replace two passages, and it -might save cache space and improve software maintenance costs to do so. - -Vladimir made the perceptive comment that we should offload most of -the decision making in this function into fix_nodes/check_balance, and -then create some sort of structure in tb that says what actions should -be performed by do_balance. - --Hans */ - -/* Balance leaf node in case of delete or cut: insert_size[0] < 0 +/* + * summary: + * if deleting something ( tb->insert_size[0] < 0 ) + * return(balance_leaf_when_delete()); (flag d handled here) + * else + * if lnum is larger than 0 we put items into the left node + * if rnum is larger than 0 we put items into the right node + * if snum1 is larger than 0 we put items into the new node s1 + * if snum2 is larger than 0 we put items into the new node s2 + * Note that all *num* count new items being created. + */ + +static void balance_leaf_when_delete_del(struct tree_balance *tb) +{ + struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path); + int item_pos = PATH_LAST_POSITION(tb->tb_path); + struct buffer_info bi; +#ifdef CONFIG_REISERFS_CHECK + struct item_head *ih = item_head(tbS0, item_pos); +#endif + + RFALSE(ih_item_len(ih) + IH_SIZE != -tb->insert_size[0], + "vs-12013: mode Delete, insert size %d, ih to be deleted %h", + -tb->insert_size[0], ih); + + buffer_info_init_tbS0(tb, &bi); + leaf_delete_items(&bi, 0, item_pos, 1, -1); + + if (!item_pos && tb->CFL[0]) { + if (B_NR_ITEMS(tbS0)) { + replace_key(tb, tb->CFL[0], tb->lkey[0], tbS0, 0); + } else { + if (!PATH_H_POSITION(tb->tb_path, 1)) + replace_key(tb, tb->CFL[0], tb->lkey[0], + PATH_H_PPARENT(tb->tb_path, 0), 0); + } + } + + RFALSE(!item_pos && !tb->CFL[0], + "PAP-12020: tb->CFL[0]==%p, tb->L[0]==%p", tb->CFL[0], + tb->L[0]); +} + +/* cut item in S[0] */ +static void balance_leaf_when_delete_cut(struct tree_balance *tb) +{ + struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path); + int item_pos = PATH_LAST_POSITION(tb->tb_path); + struct item_head *ih = item_head(tbS0, item_pos); + int pos_in_item = tb->tb_path->pos_in_item; + struct buffer_info bi; + buffer_info_init_tbS0(tb, &bi); + + if (is_direntry_le_ih(ih)) { + /* + * UFS unlink semantics are such that you can only + * delete one directory entry at a time. + * + * when we cut a directory tb->insert_size[0] means + * number of entries to be cut (always 1) + */ + tb->insert_size[0] = -1; + leaf_cut_from_buffer(&bi, item_pos, pos_in_item, + -tb->insert_size[0]); + + RFALSE(!item_pos && !pos_in_item && !tb->CFL[0], + "PAP-12030: can not change delimiting key. CFL[0]=%p", + tb->CFL[0]); + + if (!item_pos && !pos_in_item && tb->CFL[0]) + replace_key(tb, tb->CFL[0], tb->lkey[0], tbS0, 0); + } else { + leaf_cut_from_buffer(&bi, item_pos, pos_in_item, + -tb->insert_size[0]); + + RFALSE(!ih_item_len(ih), + "PAP-12035: cut must leave non-zero dynamic " + "length of item"); + } +} + +static int balance_leaf_when_delete_left(struct tree_balance *tb) +{ + struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path); + int n = B_NR_ITEMS(tbS0); + + /* L[0] must be joined with S[0] */ + if (tb->lnum[0] == -1) { + /* R[0] must be also joined with S[0] */ + if (tb->rnum[0] == -1) { + if (tb->FR[0] == PATH_H_PPARENT(tb->tb_path, 0)) { + /* + * all contents of all the + * 3 buffers will be in L[0] + */ + if (PATH_H_POSITION(tb->tb_path, 1) == 0 && + 1 < B_NR_ITEMS(tb->FR[0])) + replace_key(tb, tb->CFL[0], + tb->lkey[0], tb->FR[0], 1); + + leaf_move_items(LEAF_FROM_S_TO_L, tb, n, -1, + NULL); + leaf_move_items(LEAF_FROM_R_TO_L, tb, + B_NR_ITEMS(tb->R[0]), -1, + NULL); + + reiserfs_invalidate_buffer(tb, tbS0); + reiserfs_invalidate_buffer(tb, tb->R[0]); + + return 0; + } + + /* all contents of all the 3 buffers will be in R[0] */ + leaf_move_items(LEAF_FROM_S_TO_R, tb, n, -1, NULL); + leaf_move_items(LEAF_FROM_L_TO_R, tb, + B_NR_ITEMS(tb->L[0]), -1, NULL); + + /* right_delimiting_key is correct in R[0] */ + replace_key(tb, tb->CFR[0], tb->rkey[0], tb->R[0], 0); + + reiserfs_invalidate_buffer(tb, tbS0); + reiserfs_invalidate_buffer(tb, tb->L[0]); + + return -1; + } + + RFALSE(tb->rnum[0] != 0, + "PAP-12045: rnum must be 0 (%d)", tb->rnum[0]); + /* all contents of L[0] and S[0] will be in L[0] */ + leaf_shift_left(tb, n, -1); + + reiserfs_invalidate_buffer(tb, tbS0); + + return 0; + } + + /* + * a part of contents of S[0] will be in L[0] and + * the rest part of S[0] will be in R[0] + */ + + RFALSE((tb->lnum[0] + tb->rnum[0] < n) || + (tb->lnum[0] + tb->rnum[0] > n + 1), + "PAP-12050: rnum(%d) and lnum(%d) and item " + "number(%d) in S[0] are not consistent", + tb->rnum[0], tb->lnum[0], n); + RFALSE((tb->lnum[0] + tb->rnum[0] == n) && + (tb->lbytes != -1 || tb->rbytes != -1), + "PAP-12055: bad rbytes (%d)/lbytes (%d) " + "parameters when items are not split", + tb->rbytes, tb->lbytes); + RFALSE((tb->lnum[0] + tb->rnum[0] == n + 1) && + (tb->lbytes < 1 || tb->rbytes != -1), + "PAP-12060: bad rbytes (%d)/lbytes (%d) " + "parameters when items are split", + tb->rbytes, tb->lbytes); + + leaf_shift_left(tb, tb->lnum[0], tb->lbytes); + leaf_shift_right(tb, tb->rnum[0], tb->rbytes); + + reiserfs_invalidate_buffer(tb, tbS0); + + return 0; +} + +/* + * Balance leaf node in case of delete or cut: insert_size[0] < 0 * * lnum, rnum can have values >= -1 * -1 means that the neighbor must be joined with S * 0 means that nothing should be done with the neighbor - * >0 means to shift entirely or partly the specified number of items to the neighbor + * >0 means to shift entirely or partly the specified number of items + * to the neighbor */ static int balance_leaf_when_delete(struct tree_balance *tb, int flag) { struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path); int item_pos = PATH_LAST_POSITION(tb->tb_path); - int pos_in_item = tb->tb_path->pos_in_item; struct buffer_info bi; int n; struct item_head *ih; @@ -114,1022 +251,1202 @@ static int balance_leaf_when_delete(struct tree_balance *tb, int flag) RFALSE(!tb->blknum[0] && !PATH_H_PPARENT(tb->tb_path, 0), "PAP-12010: tree can not be empty"); - ih = B_N_PITEM_HEAD(tbS0, item_pos); + ih = item_head(tbS0, item_pos); buffer_info_init_tbS0(tb, &bi); /* Delete or truncate the item */ - switch (flag) { - case M_DELETE: /* delete item in S[0] */ + BUG_ON(flag != M_DELETE && flag != M_CUT); + if (flag == M_DELETE) + balance_leaf_when_delete_del(tb); + else /* M_CUT */ + balance_leaf_when_delete_cut(tb); - RFALSE(ih_item_len(ih) + IH_SIZE != -tb->insert_size[0], - "vs-12013: mode Delete, insert size %d, ih to be deleted %h", - -tb->insert_size[0], ih); - leaf_delete_items(&bi, 0, item_pos, 1, -1); + /* + * the rule is that no shifting occurs unless by shifting + * a node can be freed + */ + n = B_NR_ITEMS(tbS0); - if (!item_pos && tb->CFL[0]) { - if (B_NR_ITEMS(tbS0)) { - replace_key(tb, tb->CFL[0], tb->lkey[0], tbS0, - 0); - } else { - if (!PATH_H_POSITION(tb->tb_path, 1)) - replace_key(tb, tb->CFL[0], tb->lkey[0], - PATH_H_PPARENT(tb->tb_path, - 0), 0); - } - } - RFALSE(!item_pos && !tb->CFL[0], - "PAP-12020: tb->CFL[0]==%p, tb->L[0]==%p", tb->CFL[0], - tb->L[0]); + /* L[0] takes part in balancing */ + if (tb->lnum[0]) + return balance_leaf_when_delete_left(tb); - break; + if (tb->rnum[0] == -1) { + /* all contents of R[0] and S[0] will be in R[0] */ + leaf_shift_right(tb, n, -1); + reiserfs_invalidate_buffer(tb, tbS0); + return 0; + } - case M_CUT:{ /* cut item in S[0] */ - if (is_direntry_le_ih(ih)) { + RFALSE(tb->rnum[0], + "PAP-12065: bad rnum parameter must be 0 (%d)", tb->rnum[0]); + return 0; +} - /* UFS unlink semantics are such that you can only delete one directory entry at a time. */ - /* when we cut a directory tb->insert_size[0] means number of entries to be cut (always 1) */ - tb->insert_size[0] = -1; - leaf_cut_from_buffer(&bi, item_pos, pos_in_item, - -tb->insert_size[0]); +static void balance_leaf_insert_left(struct tree_balance *tb, + struct item_head *ih, const char *body) +{ + int ret; + struct buffer_info bi; + int n = B_NR_ITEMS(tb->L[0]); + + if (tb->item_pos == tb->lnum[0] - 1 && tb->lbytes != -1) { + /* part of new item falls into L[0] */ + int new_item_len, shift; + int version; + + ret = leaf_shift_left(tb, tb->lnum[0] - 1, -1); + + /* Calculate item length to insert to S[0] */ + new_item_len = ih_item_len(ih) - tb->lbytes; + + /* Calculate and check item length to insert to L[0] */ + put_ih_item_len(ih, ih_item_len(ih) - new_item_len); + + RFALSE(ih_item_len(ih) <= 0, + "PAP-12080: there is nothing to insert into L[0]: " + "ih_item_len=%d", ih_item_len(ih)); + + /* Insert new item into L[0] */ + buffer_info_init_left(tb, &bi); + leaf_insert_into_buf(&bi, n + tb->item_pos - ret, ih, body, + min_t(int, tb->zeroes_num, ih_item_len(ih))); + + version = ih_version(ih); + + /* + * Calculate key component, item length and body to + * insert into S[0] + */ + shift = 0; + if (is_indirect_le_ih(ih)) + shift = tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT; + + add_le_ih_k_offset(ih, tb->lbytes << shift); + + put_ih_item_len(ih, new_item_len); + if (tb->lbytes > tb->zeroes_num) { + body += (tb->lbytes - tb->zeroes_num); + tb->zeroes_num = 0; + } else + tb->zeroes_num -= tb->lbytes; + + RFALSE(ih_item_len(ih) <= 0, + "PAP-12085: there is nothing to insert into S[0]: " + "ih_item_len=%d", ih_item_len(ih)); + } else { + /* new item in whole falls into L[0] */ + /* Shift lnum[0]-1 items to L[0] */ + ret = leaf_shift_left(tb, tb->lnum[0] - 1, tb->lbytes); + + /* Insert new item into L[0] */ + buffer_info_init_left(tb, &bi); + leaf_insert_into_buf(&bi, n + tb->item_pos - ret, ih, body, + tb->zeroes_num); + tb->insert_size[0] = 0; + tb->zeroes_num = 0; + } +} - RFALSE(!item_pos && !pos_in_item && !tb->CFL[0], - "PAP-12030: can not change delimiting key. CFL[0]=%p", - tb->CFL[0]); +static void balance_leaf_paste_left_shift_dirent(struct tree_balance *tb, + struct item_head *ih, + const char *body) +{ + int n = B_NR_ITEMS(tb->L[0]); + struct buffer_info bi; - if (!item_pos && !pos_in_item && tb->CFL[0]) { - replace_key(tb, tb->CFL[0], tb->lkey[0], - tbS0, 0); - } - } else { - leaf_cut_from_buffer(&bi, item_pos, pos_in_item, - -tb->insert_size[0]); + RFALSE(tb->zeroes_num, + "PAP-12090: invalid parameter in case of a directory"); + + /* directory item */ + if (tb->lbytes > tb->pos_in_item) { + /* new directory entry falls into L[0] */ + struct item_head *pasted; + int ret, l_pos_in_item = tb->pos_in_item; + + /* + * Shift lnum[0] - 1 items in whole. + * Shift lbytes - 1 entries from given directory item + */ + ret = leaf_shift_left(tb, tb->lnum[0], tb->lbytes - 1); + if (ret && !tb->item_pos) { + pasted = item_head(tb->L[0], B_NR_ITEMS(tb->L[0]) - 1); + l_pos_in_item += ih_entry_count(pasted) - + (tb->lbytes - 1); + } - RFALSE(!ih_item_len(ih), - "PAP-12035: cut must leave non-zero dynamic length of item"); - } - break; + /* Append given directory entry to directory item */ + buffer_info_init_left(tb, &bi); + leaf_paste_in_buffer(&bi, n + tb->item_pos - ret, + l_pos_in_item, tb->insert_size[0], + body, tb->zeroes_num); + + /* + * previous string prepared space for pasting new entry, + * following string pastes this entry + */ + + /* + * when we have merge directory item, pos_in_item + * has been changed too + */ + + /* paste new directory entry. 1 is entry number */ + leaf_paste_entries(&bi, n + tb->item_pos - ret, + l_pos_in_item, 1, + (struct reiserfs_de_head *) body, + body + DEH_SIZE, tb->insert_size[0]); + tb->insert_size[0] = 0; + } else { + /* new directory item doesn't fall into L[0] */ + /* + * Shift lnum[0]-1 items in whole. Shift lbytes + * directory entries from directory item number lnum[0] + */ + leaf_shift_left(tb, tb->lnum[0], tb->lbytes); + } + + /* Calculate new position to append in item body */ + tb->pos_in_item -= tb->lbytes; +} + +static void balance_leaf_paste_left_shift(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(tb->L[0]); + struct buffer_info bi; + + if (is_direntry_le_ih(item_head(tbS0, tb->item_pos))) { + balance_leaf_paste_left_shift_dirent(tb, ih, body); + return; + } + + RFALSE(tb->lbytes <= 0, + "PAP-12095: there is nothing to shift to L[0]. " + "lbytes=%d", tb->lbytes); + RFALSE(tb->pos_in_item != ih_item_len(item_head(tbS0, tb->item_pos)), + "PAP-12100: incorrect position to paste: " + "item_len=%d, pos_in_item=%d", + ih_item_len(item_head(tbS0, tb->item_pos)), tb->pos_in_item); + + /* appended item will be in L[0] in whole */ + if (tb->lbytes >= tb->pos_in_item) { + struct item_head *tbS0_pos_ih, *tbL0_ih; + struct item_head *tbS0_0_ih; + struct reiserfs_key *left_delim_key; + int ret, l_n, version, temp_l; + + tbS0_pos_ih = item_head(tbS0, tb->item_pos); + tbS0_0_ih = item_head(tbS0, 0); + + /* + * this bytes number must be appended + * to the last item of L[h] + */ + l_n = tb->lbytes - tb->pos_in_item; + + /* Calculate new insert_size[0] */ + tb->insert_size[0] -= l_n; + + RFALSE(tb->insert_size[0] <= 0, + "PAP-12105: there is nothing to paste into " + "L[0]. insert_size=%d", tb->insert_size[0]); + + ret = leaf_shift_left(tb, tb->lnum[0], + ih_item_len(tbS0_pos_ih)); + + tbL0_ih = item_head(tb->L[0], n + tb->item_pos - ret); + + /* Append to body of item in L[0] */ + buffer_info_init_left(tb, &bi); + leaf_paste_in_buffer(&bi, n + tb->item_pos - ret, + ih_item_len(tbL0_ih), l_n, body, + min_t(int, l_n, tb->zeroes_num)); + + /* + * 0-th item in S0 can be only of DIRECT type + * when l_n != 0 + */ + temp_l = l_n; + + RFALSE(ih_item_len(tbS0_0_ih), + "PAP-12106: item length must be 0"); + RFALSE(comp_short_le_keys(&tbS0_0_ih->ih_key, + leaf_key(tb->L[0], n + tb->item_pos - ret)), + "PAP-12107: items must be of the same file"); + + if (is_indirect_le_ih(tbL0_ih)) { + int shift = tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT; + temp_l = l_n << shift; } + /* update key of first item in S0 */ + version = ih_version(tbS0_0_ih); + add_le_key_k_offset(version, &tbS0_0_ih->ih_key, temp_l); + + /* update left delimiting key */ + left_delim_key = internal_key(tb->CFL[0], tb->lkey[0]); + add_le_key_k_offset(version, left_delim_key, temp_l); + + /* + * Calculate new body, position in item and + * insert_size[0] + */ + if (l_n > tb->zeroes_num) { + body += (l_n - tb->zeroes_num); + tb->zeroes_num = 0; + } else + tb->zeroes_num -= l_n; + tb->pos_in_item = 0; + + RFALSE(comp_short_le_keys(&tbS0_0_ih->ih_key, + leaf_key(tb->L[0], + B_NR_ITEMS(tb->L[0]) - 1)) || + !op_is_left_mergeable(leaf_key(tbS0, 0), tbS0->b_size) || + !op_is_left_mergeable(left_delim_key, tbS0->b_size), + "PAP-12120: item must be merge-able with left " + "neighboring item"); + } else { + /* only part of the appended item will be in L[0] */ + + /* Calculate position in item for append in S[0] */ + tb->pos_in_item -= tb->lbytes; + + RFALSE(tb->pos_in_item <= 0, + "PAP-12125: no place for paste. pos_in_item=%d", + tb->pos_in_item); + + /* + * Shift lnum[0] - 1 items in whole. + * Shift lbytes - 1 byte from item number lnum[0] + */ + leaf_shift_left(tb, tb->lnum[0], tb->lbytes); + } +} - default: - print_cur_tb("12040"); - reiserfs_panic(tb->tb_sb, "PAP-12040", - "unexpected mode: %s(%d)", - (flag == - M_PASTE) ? "PASTE" : ((flag == - M_INSERT) ? "INSERT" : - "UNKNOWN"), flag); + +/* appended item will be in L[0] in whole */ +static void balance_leaf_paste_left_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(tb->L[0]); + struct buffer_info bi; + struct item_head *pasted; + int ret; + + /* if we paste into first item of S[0] and it is left mergable */ + if (!tb->item_pos && + op_is_left_mergeable(leaf_key(tbS0, 0), tbS0->b_size)) { + /* + * then increment pos_in_item by the size of the + * last item in L[0] + */ + pasted = item_head(tb->L[0], n - 1); + if (is_direntry_le_ih(pasted)) + tb->pos_in_item += ih_entry_count(pasted); + else + tb->pos_in_item += ih_item_len(pasted); } - /* the rule is that no shifting occurs unless by shifting a node can be freed */ - n = B_NR_ITEMS(tbS0); - if (tb->lnum[0]) { /* L[0] takes part in balancing */ - if (tb->lnum[0] == -1) { /* L[0] must be joined with S[0] */ - if (tb->rnum[0] == -1) { /* R[0] must be also joined with S[0] */ - if (tb->FR[0] == PATH_H_PPARENT(tb->tb_path, 0)) { - /* all contents of all the 3 buffers will be in L[0] */ - if (PATH_H_POSITION(tb->tb_path, 1) == 0 - && 1 < B_NR_ITEMS(tb->FR[0])) - replace_key(tb, tb->CFL[0], - tb->lkey[0], - tb->FR[0], 1); - - leaf_move_items(LEAF_FROM_S_TO_L, tb, n, - -1, NULL); - leaf_move_items(LEAF_FROM_R_TO_L, tb, - B_NR_ITEMS(tb->R[0]), - -1, NULL); - - reiserfs_invalidate_buffer(tb, tbS0); - reiserfs_invalidate_buffer(tb, - tb->R[0]); - - return 0; - } - /* all contents of all the 3 buffers will be in R[0] */ - leaf_move_items(LEAF_FROM_S_TO_R, tb, n, -1, - NULL); - leaf_move_items(LEAF_FROM_L_TO_R, tb, - B_NR_ITEMS(tb->L[0]), -1, NULL); + /* + * Shift lnum[0] - 1 items in whole. + * Shift lbytes - 1 byte from item number lnum[0] + */ + ret = leaf_shift_left(tb, tb->lnum[0], tb->lbytes); + + /* Append to body of item in L[0] */ + buffer_info_init_left(tb, &bi); + leaf_paste_in_buffer(&bi, n + tb->item_pos - ret, tb->pos_in_item, + tb->insert_size[0], body, tb->zeroes_num); + + /* if appended item is directory, paste entry */ + pasted = item_head(tb->L[0], n + tb->item_pos - ret); + if (is_direntry_le_ih(pasted)) + leaf_paste_entries(&bi, n + tb->item_pos - ret, + tb->pos_in_item, 1, + (struct reiserfs_de_head *)body, + body + DEH_SIZE, tb->insert_size[0]); + + /* + * if appended item is indirect item, put unformatted node + * into un list + */ + if (is_indirect_le_ih(pasted)) + set_ih_free_space(pasted, 0); - /* right_delimiting_key is correct in R[0] */ - replace_key(tb, tb->CFR[0], tb->rkey[0], - tb->R[0], 0); + tb->insert_size[0] = 0; + tb->zeroes_num = 0; +} - reiserfs_invalidate_buffer(tb, tbS0); - reiserfs_invalidate_buffer(tb, tb->L[0]); +static void balance_leaf_paste_left(struct tree_balance *tb, + struct item_head *ih, const char *body) +{ + /* 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); +} - return -1; - } +/* Shift lnum[0] items from S[0] to the left neighbor L[0] */ +static void balance_leaf_left(struct tree_balance *tb, struct item_head *ih, + const char *body, int flag) +{ + if (tb->lnum[0] <= 0) + return; - RFALSE(tb->rnum[0] != 0, - "PAP-12045: rnum must be 0 (%d)", tb->rnum[0]); - /* all contents of L[0] and S[0] will be in L[0] */ - leaf_shift_left(tb, n, -1); + /* new item or it part falls to L[0], shift it too */ + if (tb->item_pos < tb->lnum[0]) { + BUG_ON(flag != M_INSERT && flag != M_PASTE); + + if (flag == M_INSERT) + balance_leaf_insert_left(tb, ih, body); + else /* M_PASTE */ + balance_leaf_paste_left(tb, ih, body); + } else + /* new item doesn't fall into L[0] */ + leaf_shift_left(tb, tb->lnum[0], tb->lbytes); +} - reiserfs_invalidate_buffer(tb, tbS0); - return 0; +static void balance_leaf_insert_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; + + /* new item or part of it doesn't fall into R[0] */ + if (n - tb->rnum[0] >= tb->item_pos) { + leaf_shift_right(tb, tb->rnum[0], tb->rbytes); + return; + } + + /* new item or its part falls to R[0] */ + + /* part of new item falls into R[0] */ + if (tb->item_pos == n - tb->rnum[0] + 1 && tb->rbytes != -1) { + loff_t old_key_comp, old_len, r_zeroes_number; + const char *r_body; + int version, shift; + loff_t offset; + + leaf_shift_right(tb, tb->rnum[0] - 1, -1); + + version = ih_version(ih); + + /* Remember key component and item length */ + old_key_comp = le_ih_k_offset(ih); + old_len = ih_item_len(ih); + + /* + * Calculate key component and item length to insert + * into R[0] + */ + shift = 0; + if (is_indirect_le_ih(ih)) + shift = tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT; + offset = le_ih_k_offset(ih) + ((old_len - tb->rbytes) << shift); + set_le_ih_k_offset(ih, offset); + put_ih_item_len(ih, tb->rbytes); + + /* Insert part of the item into R[0] */ + buffer_info_init_right(tb, &bi); + if ((old_len - tb->rbytes) > tb->zeroes_num) { + r_zeroes_number = 0; + r_body = body + (old_len - tb->rbytes) - tb->zeroes_num; + } else { + r_body = body; + r_zeroes_number = tb->zeroes_num - + (old_len - tb->rbytes); + tb->zeroes_num -= r_zeroes_number; } - /* a part of contents of S[0] will be in L[0] and the rest part of S[0] will be in R[0] */ - - RFALSE((tb->lnum[0] + tb->rnum[0] < n) || - (tb->lnum[0] + tb->rnum[0] > n + 1), - "PAP-12050: rnum(%d) and lnum(%d) and item number(%d) in S[0] are not consistent", - tb->rnum[0], tb->lnum[0], n); - RFALSE((tb->lnum[0] + tb->rnum[0] == n) && - (tb->lbytes != -1 || tb->rbytes != -1), - "PAP-12055: bad rbytes (%d)/lbytes (%d) parameters when items are not split", - tb->rbytes, tb->lbytes); - RFALSE((tb->lnum[0] + tb->rnum[0] == n + 1) && - (tb->lbytes < 1 || tb->rbytes != -1), - "PAP-12060: bad rbytes (%d)/lbytes (%d) parameters when items are split", - tb->rbytes, tb->lbytes); - leaf_shift_left(tb, tb->lnum[0], tb->lbytes); + leaf_insert_into_buf(&bi, 0, ih, r_body, r_zeroes_number); + + /* Replace right delimiting key by first key in R[0] */ + replace_key(tb, tb->CFR[0], tb->rkey[0], tb->R[0], 0); + + /* + * Calculate key component and item length to + * insert into S[0] + */ + set_le_ih_k_offset(ih, old_key_comp); + put_ih_item_len(ih, old_len - tb->rbytes); + + tb->insert_size[0] -= tb->rbytes; + + } else { + /* whole new item falls into R[0] */ + + /* Shift rnum[0]-1 items to R[0] */ + ret = leaf_shift_right(tb, tb->rnum[0] - 1, tb->rbytes); + + /* Insert new item into R[0] */ + buffer_info_init_right(tb, &bi); + leaf_insert_into_buf(&bi, tb->item_pos - n + tb->rnum[0] - 1, + ih, body, tb->zeroes_num); + + if (tb->item_pos - n + tb->rnum[0] - 1 == 0) + replace_key(tb, tb->CFR[0], tb->rkey[0], tb->R[0], 0); + + tb->zeroes_num = tb->insert_size[0] = 0; + } +} + + +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(tb->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); + } +} - reiserfs_invalidate_buffer(tb, tbS0); +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; - return 0; + /* 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; } - if (tb->rnum[0] == -1) { - /* all contents of R[0] and S[0] will be in R[0] */ - leaf_shift_right(tb, n, -1); - reiserfs_invalidate_buffer(tb, tbS0); - return 0; + /* 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(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] + */ + 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; } - RFALSE(tb->rnum[0], - "PAP-12065: bad rnum parameter must be 0 (%d)", tb->rnum[0]); - return 0; + 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 int balance_leaf(struct tree_balance *tb, struct item_head *ih, /* item header of inserted item (this is on little endian) */ - const char *body, /* body of inserted item or bytes to paste */ - int flag, /* i - insert, d - delete, c - cut, p - paste - (see comment to do_balance) */ - struct item_head *insert_key, /* in our processing of one level we sometimes determine what - must be inserted into the next higher level. This insertion - consists of a key or two keys and their corresponding - pointers */ - struct buffer_head **insert_ptr /* inserted node-ptrs for the next level */ - ) +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 item_pos = PATH_LAST_POSITION(tb->tb_path); /* index into the array of item headers in S[0] - of the affected item */ + int n = B_NR_ITEMS(tbS0); + struct item_head *pasted; struct buffer_info bi; - struct buffer_head *S_new[2]; /* new nodes allocated to hold what could not fit into S */ - int snum[2]; /* number of items that will be placed - into S_new (includes partially shifted - items) */ - int sbytes[2]; /* if an item is partially shifted into S_new then - if it is a directory item - it is the number of entries from the item that are shifted into S_new - else - it is the number of bytes from the item that are shifted into S_new - */ - int n, i; - int ret_val; - int pos_in_item; - int zeros_num; - PROC_INFO_INC(tb->tb_sb, balance_at[0]); + 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); + } - /* Make balance in case insert_size[0] < 0 */ - if (tb->insert_size[0] < 0) - return balance_leaf_when_delete(tb, flag); + /* 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]); - zeros_num = 0; - if (flag == M_INSERT && !body) - zeros_num = ih_item_len(ih); + if (!tb->pos_in_item) { - pos_in_item = tb->tb_path->pos_in_item; - /* for indirect item pos_in_item is measured in unformatted node - pointers. Recalculate to bytes */ - if (flag != M_INSERT - && is_indirect_le_ih(B_N_PITEM_HEAD(tbS0, item_pos))) - pos_in_item *= UNFM_P_SIZE; - - if (tb->lnum[0] > 0) { - /* Shift lnum[0] items from S[0] to the left neighbor L[0] */ - if (item_pos < tb->lnum[0]) { - /* new item or it part falls to L[0], shift it too */ - n = B_NR_ITEMS(tb->L[0]); - - switch (flag) { - case M_INSERT: /* insert item into L[0] */ - - if (item_pos == tb->lnum[0] - 1 && tb->lbytes != -1) { - /* part of new item falls into L[0] */ - int new_item_len; - int version; - - ret_val = leaf_shift_left(tb, tb->lnum[0] - 1, -1); - - /* Calculate item length to insert to S[0] */ - new_item_len = ih_item_len(ih) - tb->lbytes; - /* Calculate and check item length to insert to L[0] */ - put_ih_item_len(ih, ih_item_len(ih) - new_item_len); - - RFALSE(ih_item_len(ih) <= 0, - "PAP-12080: there is nothing to insert into L[0]: ih_item_len=%d", - ih_item_len(ih)); - - /* Insert new item into L[0] */ - buffer_info_init_left(tb, &bi); - leaf_insert_into_buf(&bi, - n + item_pos - ret_val, ih, body, - zeros_num > ih_item_len(ih) ? ih_item_len(ih) : zeros_num); - - version = ih_version(ih); - - /* Calculate key component, item length and body to insert into S[0] */ - set_le_ih_k_offset(ih, le_ih_k_offset(ih) + - (tb-> lbytes << (is_indirect_le_ih(ih) ? tb->tb_sb-> s_blocksize_bits - UNFM_P_SHIFT : 0))); - - put_ih_item_len(ih, new_item_len); - if (tb->lbytes > zeros_num) { - body += (tb->lbytes - zeros_num); - zeros_num = 0; - } else - zeros_num -= tb->lbytes; - - RFALSE(ih_item_len(ih) <= 0, - "PAP-12085: there is nothing to insert into S[0]: ih_item_len=%d", - ih_item_len(ih)); - } else { - /* new item in whole falls into L[0] */ - /* Shift lnum[0]-1 items to L[0] */ - ret_val = leaf_shift_left(tb, tb->lnum[0] - 1, tb->lbytes); - /* Insert new item into L[0] */ - buffer_info_init_left(tb, &bi); - leaf_insert_into_buf(&bi, n + item_pos - ret_val, ih, body, zeros_num); - tb->insert_size[0] = 0; - zeros_num = 0; - } - break; - - case M_PASTE: /* append item in L[0] */ - - if (item_pos == tb->lnum[0] - 1 && tb->lbytes != -1) { - /* we must shift the part of the appended item */ - if (is_direntry_le_ih(B_N_PITEM_HEAD(tbS0, item_pos))) { - - RFALSE(zeros_num, - "PAP-12090: invalid parameter in case of a directory"); - /* directory item */ - if (tb->lbytes > pos_in_item) { - /* new directory entry falls into L[0] */ - struct item_head *pasted; - int l_pos_in_item = pos_in_item; - - /* Shift lnum[0] - 1 items in whole. Shift lbytes - 1 entries from given directory item */ - ret_val = leaf_shift_left(tb, tb->lnum[0], tb->lbytes-1); - if (ret_val && !item_pos) { - pasted = B_N_PITEM_HEAD(tb->L[0], B_NR_ITEMS(tb->L[0]) - 1); - l_pos_in_item += I_ENTRY_COUNT(pasted) - (tb->lbytes -1); - } - - /* Append given directory entry to directory item */ - buffer_info_init_left(tb, &bi); - leaf_paste_in_buffer(&bi, n + item_pos - ret_val, l_pos_in_item, tb->insert_size[0], body, zeros_num); - - /* previous string prepared space for pasting new entry, following string pastes this entry */ - - /* when we have merge directory item, pos_in_item has been changed too */ - - /* paste new directory entry. 1 is entry number */ - leaf_paste_entries(&bi, n + item_pos - ret_val, l_pos_in_item, - 1, (struct reiserfs_de_head *) body, - body + DEH_SIZE, tb->insert_size[0]); - tb->insert_size[0] = 0; - } else { - /* new directory item doesn't fall into L[0] */ - /* Shift lnum[0]-1 items in whole. Shift lbytes directory entries from directory item number lnum[0] */ - leaf_shift_left(tb, tb->lnum[0], tb->lbytes); - } - /* Calculate new position to append in item body */ - pos_in_item -= tb->lbytes; - } else { - /* regular object */ - RFALSE(tb->lbytes <= 0, "PAP-12095: there is nothing to shift to L[0]. lbytes=%d", tb->lbytes); - RFALSE(pos_in_item != ih_item_len(B_N_PITEM_HEAD(tbS0, item_pos)), - "PAP-12100: incorrect position to paste: item_len=%d, pos_in_item=%d", - ih_item_len(B_N_PITEM_HEAD(tbS0, item_pos)),pos_in_item); - - if (tb->lbytes >= pos_in_item) { - /* appended item will be in L[0] in whole */ - int l_n; - - /* this bytes number must be appended to the last item of L[h] */ - l_n = tb->lbytes - pos_in_item; - - /* Calculate new insert_size[0] */ - tb->insert_size[0] -= l_n; - - RFALSE(tb->insert_size[0] <= 0, - "PAP-12105: there is nothing to paste into L[0]. insert_size=%d", - tb->insert_size[0]); - ret_val = leaf_shift_left(tb, tb->lnum[0], ih_item_len - (B_N_PITEM_HEAD(tbS0, item_pos))); - /* Append to body of item in L[0] */ - buffer_info_init_left(tb, &bi); - leaf_paste_in_buffer - (&bi, n + item_pos - ret_val, ih_item_len - (B_N_PITEM_HEAD(tb->L[0], n + item_pos - ret_val)), - l_n, body, - zeros_num > l_n ? l_n : zeros_num); - /* 0-th item in S0 can be only of DIRECT type when l_n != 0 */ - { - int version; - int temp_l = l_n; - - RFALSE(ih_item_len(B_N_PITEM_HEAD(tbS0, 0)), - "PAP-12106: item length must be 0"); - RFALSE(comp_short_le_keys(B_N_PKEY(tbS0, 0), B_N_PKEY - (tb->L[0], n + item_pos - ret_val)), - "PAP-12107: items must be of the same file"); - if (is_indirect_le_ih(B_N_PITEM_HEAD(tb->L[0], n + item_pos - ret_val))) { - temp_l = l_n << (tb->tb_sb-> s_blocksize_bits - UNFM_P_SHIFT); - } - /* update key of first item in S0 */ - version = ih_version(B_N_PITEM_HEAD(tbS0, 0)); - set_le_key_k_offset(version, B_N_PKEY(tbS0, 0), - le_key_k_offset(version,B_N_PKEY(tbS0, 0)) + temp_l); - /* update left delimiting key */ - set_le_key_k_offset(version, B_N_PDELIM_KEY(tb->CFL[0], tb->lkey[0]), - le_key_k_offset(version, B_N_PDELIM_KEY(tb->CFL[0], tb->lkey[0])) + temp_l); - } - - /* Calculate new body, position in item and insert_size[0] */ - if (l_n > zeros_num) { - body += (l_n - zeros_num); - zeros_num = 0; - } else - zeros_num -= l_n; - pos_in_item = 0; - - RFALSE(comp_short_le_keys(B_N_PKEY(tbS0, 0), B_N_PKEY(tb->L[0], B_NR_ITEMS(tb->L[0]) - 1)) - || !op_is_left_mergeable(B_N_PKEY(tbS0, 0), tbS0->b_size) - || !op_is_left_mergeable(B_N_PDELIM_KEY(tb->CFL[0], tb->lkey[0]), tbS0->b_size), - "PAP-12120: item must be merge-able with left neighboring item"); - } else { /* only part of the appended item will be in L[0] */ - - /* Calculate position in item for append in S[0] */ - pos_in_item -= tb->lbytes; - - RFALSE(pos_in_item <= 0, "PAP-12125: no place for paste. pos_in_item=%d", pos_in_item); - - /* Shift lnum[0] - 1 items in whole. Shift lbytes - 1 byte from item number lnum[0] */ - leaf_shift_left(tb, tb->lnum[0], tb->lbytes); - } - } - } else { /* appended item will be in L[0] in whole */ - - struct item_head *pasted; - - if (!item_pos && op_is_left_mergeable(B_N_PKEY(tbS0, 0), tbS0->b_size)) { /* if we paste into first item of S[0] and it is left mergable */ - /* then increment pos_in_item by the size of the last item in L[0] */ - pasted = B_N_PITEM_HEAD(tb->L[0], n - 1); - if (is_direntry_le_ih(pasted)) - pos_in_item += ih_entry_count(pasted); - else - pos_in_item += ih_item_len(pasted); - } - - /* Shift lnum[0] - 1 items in whole. Shift lbytes - 1 byte from item number lnum[0] */ - ret_val = leaf_shift_left(tb, tb->lnum[0], tb->lbytes); - /* Append to body of item in L[0] */ - buffer_info_init_left(tb, &bi); - leaf_paste_in_buffer(&bi, n + item_pos - ret_val, - pos_in_item, - tb->insert_size[0], - body, zeros_num); - - /* if appended item is directory, paste entry */ - pasted = B_N_PITEM_HEAD(tb->L[0], n + item_pos - ret_val); - if (is_direntry_le_ih(pasted)) - leaf_paste_entries(&bi, n + item_pos - ret_val, - pos_in_item, 1, - (struct reiserfs_de_head *) body, - body + DEH_SIZE, - tb->insert_size[0]); - /* if appended item is indirect item, put unformatted node into un list */ - if (is_indirect_le_ih(pasted)) - set_ih_free_space(pasted, 0); - tb->insert_size[0] = 0; - zeros_num = 0; - } - break; - default: /* cases d and t */ - reiserfs_panic(tb->tb_sb, "PAP-12130", - "lnum > 0: unexpected mode: " - " %s(%d)", - (flag == M_DELETE) ? "DELETE" : ((flag == M_CUT) ? "CUT" : "UNKNOWN"), flag); - } - } else { - /* new item doesn't fall into L[0] */ - leaf_shift_left(tb, tb->lnum[0], tb->lbytes); + 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); } } - /* tb->lnum[0] > 0 */ - /* Calculate new item position */ - item_pos -= (tb->lnum[0] - ((tb->lbytes != -1) ? 1 : 0)); - - if (tb->rnum[0] > 0) { - /* shift rnum[0] items from S[0] to the right neighbor R[0] */ - n = B_NR_ITEMS(tbS0); - switch (flag) { - - case M_INSERT: /* insert item */ - if (n - tb->rnum[0] < item_pos) { /* new item or its part falls to R[0] */ - if (item_pos == n - tb->rnum[0] + 1 && tb->rbytes != -1) { /* part of new item falls into R[0] */ - loff_t old_key_comp, old_len, r_zeros_number; - const char *r_body; - int version; - loff_t offset; - - leaf_shift_right(tb, tb->rnum[0] - 1, -1); - - version = ih_version(ih); - /* Remember key component and item length */ - old_key_comp = le_ih_k_offset(ih); - old_len = ih_item_len(ih); - - /* Calculate key component and item length to insert into R[0] */ - offset = le_ih_k_offset(ih) + ((old_len - tb->rbytes) << (is_indirect_le_ih(ih) ? tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT : 0)); - set_le_ih_k_offset(ih, offset); - put_ih_item_len(ih, tb->rbytes); - /* Insert part of the item into R[0] */ - buffer_info_init_right(tb, &bi); - if ((old_len - tb->rbytes) > zeros_num) { - r_zeros_number = 0; - r_body = body + (old_len - tb->rbytes) - zeros_num; - } else { - r_body = body; - r_zeros_number = zeros_num - (old_len - tb->rbytes); - zeros_num -= r_zeros_number; - } - - leaf_insert_into_buf(&bi, 0, ih, r_body, - r_zeros_number); - - /* Replace right delimiting key by first key in R[0] */ - replace_key(tb, tb->CFR[0], tb->rkey[0], - tb->R[0], 0); - - /* Calculate key component and item length to insert into S[0] */ - set_le_ih_k_offset(ih, old_key_comp); - put_ih_item_len(ih, old_len - tb->rbytes); - - tb->insert_size[0] -= tb->rbytes; - - } else { /* whole new item falls into R[0] */ - - /* Shift rnum[0]-1 items to R[0] */ - ret_val = leaf_shift_right(tb, tb->rnum[0] - 1, tb->rbytes); - /* Insert new item into R[0] */ - buffer_info_init_right(tb, &bi); - leaf_insert_into_buf(&bi, item_pos - n + tb->rnum[0] - 1, - ih, body, zeros_num); - - if (item_pos - n + tb->rnum[0] - 1 == 0) { - replace_key(tb, tb->CFR[0], - tb->rkey[0], - tb->R[0], 0); - - } - zeros_num = tb->insert_size[0] = 0; - } - } else { /* new item or part of it doesn't fall into R[0] */ - - leaf_shift_right(tb, tb->rnum[0], tb->rbytes); - } - break; + if (is_indirect_le_ih(pasted)) + set_ih_free_space(pasted, 0); + tb->zeroes_num = tb->insert_size[0] = 0; +} - case M_PASTE: /* append item */ - - if (n - tb->rnum[0] <= item_pos) { /* pasted item or part of it falls to R[0] */ - if (item_pos == n - tb->rnum[0] && tb->rbytes != -1) { /* we must shift the part of the appended item */ - if (is_direntry_le_ih(B_N_PITEM_HEAD(tbS0, item_pos))) { /* we append to directory item */ - int entry_count; - - RFALSE(zeros_num, - "PAP-12145: invalid parameter in case of a directory"); - entry_count = I_ENTRY_COUNT(B_N_PITEM_HEAD - (tbS0, item_pos)); - if (entry_count - tb->rbytes < - 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 = 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, zeros_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; - 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_zeros_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(pos_in_item != ih_item_len - (B_N_PITEM_HEAD(tbS0, item_pos)), - "PAP-12155: invalid position to paste. ih_item_len=%d, pos_in_item=%d", - pos_in_item, ih_item_len - (B_N_PITEM_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] */ - if ((n_rem = tb->insert_size[0] - tb->rbytes) < 0) - n_rem = 0; - - { - int version; - unsigned long temp_rem = n_rem; - - version = ih_version(B_N_PITEM_HEAD(tb->R[0], 0)); - if (is_indirect_le_key(version, B_N_PKEY(tb->R[0], 0))) { - temp_rem = n_rem << (tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT); - } - set_le_key_k_offset(version, B_N_PKEY(tb->R[0], 0), - le_key_k_offset(version, B_N_PKEY(tb->R[0], 0)) + temp_rem); - set_le_key_k_offset(version, B_N_PDELIM_KEY(tb->CFR[0], tb->rkey[0]), - le_key_k_offset(version, B_N_PDELIM_KEY(tb->CFR[0], tb->rkey[0])) + temp_rem); - } -/* k_offset (B_N_PKEY(tb->R[0],0)) += n_rem; - k_offset (B_N_PDELIM_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 > zeros_num) { - r_zeros_number = 0; - r_body = body + n_rem - zeros_num; - } else { - r_body = body; - r_zeros_number = zeros_num - n_rem; - zeros_num -= r_zeros_number; - } - - leaf_paste_in_buffer(&bi, 0, n_shift, - tb->insert_size[0] - n_rem, - r_body, r_zeros_number); - - if (is_indirect_le_ih(B_N_PITEM_HEAD(tb->R[0], 0))) { -#if 0 - RFALSE(n_rem, - "PAP-12160: paste more than one unformatted node pointer"); -#endif - set_ih_free_space(B_N_PITEM_HEAD(tb->R[0], 0), 0); - } - tb->insert_size[0] = n_rem; - if (!n_rem) - 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 (pos_in_item >= 0) { - buffer_info_init_right(tb, &bi); - leaf_paste_in_buffer(&bi, item_pos - n + tb->rnum[0], pos_in_item, - tb->insert_size[0], body, zeros_num); - } - - /* paste new entry, if item is directory item */ - pasted = B_N_PITEM_HEAD(tb->R[0], item_pos - n + tb->rnum[0]); - if (is_direntry_le_ih(pasted) && pos_in_item >= 0) { - leaf_paste_entries(&bi, item_pos - n + tb->rnum[0], - pos_in_item, 1, - (struct reiserfs_de_head *) body, - body + DEH_SIZE, tb->insert_size[0]); - if (!pos_in_item) { - - RFALSE(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); - zeros_num = tb->insert_size[0] = 0; - } - } else { /* new item doesn't fall into R[0] */ - - leaf_shift_right(tb, tb->rnum[0], tb->rbytes); - } - break; - default: /* cases d and t */ - reiserfs_panic(tb->tb_sb, "PAP-12175", - "rnum > 0: unexpected mode: %s(%d)", - (flag == M_DELETE) ? "DELETE" : ((flag == M_CUT) ? "CUT" : "UNKNOWN"), flag); - } +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); + /* 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; } - /* tb->rnum[0] > 0 */ - RFALSE(tb->blknum[0] > 3, - "PAP-12180: blknum can not be %d. It must be <= 3", tb->blknum[0]); - RFALSE(tb->blknum[0] < 0, - "PAP-12185: blknum can not be %d. It must be >= 0", tb->blknum[0]); + /* pasted item or part of it falls to R[0] */ - /* if while adding to a node we discover that it is possible to split - it in two, and merge the left part into the left neighbor and the - right part into the right neighbor, eliminating the node */ - if (tb->blknum[0] == 0) { /* node S[0] is empty now */ + 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); +} - RFALSE(!tb->lnum[0] || !tb->rnum[0], - "PAP-12190: lnum and rnum must not be zero"); - /* if insertion was done before 0-th position in R[0], right - delimiting key of the tb->L[0]'s and left delimiting key are - not set correctly */ - if (tb->CFL[0]) { - if (!tb->CFR[0]) - reiserfs_panic(tb->tb_sb, "vs-12195", - "CFR not initialized"); - copy_key(B_N_PDELIM_KEY(tb->CFL[0], tb->lkey[0]), - B_N_PDELIM_KEY(tb->CFR[0], tb->rkey[0])); - do_balance_mark_internal_dirty(tb, tb->CFL[0], 0); +/* shift rnum[0] items from S[0] to the right neighbor R[0] */ +static void balance_leaf_right(struct tree_balance *tb, struct item_head *ih, + const char *body, int flag) +{ + if (tb->rnum[0] <= 0) + return; + + BUG_ON(flag != M_INSERT && flag != M_PASTE); + + if (flag == M_INSERT) + 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, + 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); + struct buffer_info bi; + 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; } - reiserfs_invalidate_buffer(tb, tbS0); - return 0; + 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; } +} - /* Fill new nodes that appear in place of S[0] */ +/* 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]); + } + +} - /* I am told that this copying is because we need an array to enable - the looping code. -Hans */ - snum[0] = tb->s1num, snum[1] = tb->s2num; - sbytes[0] = tb->s1bytes; - sbytes[1] = tb->s2bytes; +static void balance_leaf_new_nodes_paste_shift(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 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; + +#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 + + 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, + struct item_head *ih, + const char *body, + struct item_head *insert_key, + struct buffer_head **insert_ptr, + int flag) +{ + int i; for (i = tb->blknum[0] - 2; i >= 0; i--) { + BUG_ON(flag != M_INSERT && flag != M_PASTE); - RFALSE(!snum[i], "PAP-12200: snum[%d] == %d. Must be > 0", i, - snum[i]); + RFALSE(!tb->snum[i], + "PAP-12200: snum[%d] == %d. Must be > 0", i, + tb->snum[i]); /* here we shift from S to S_new nodes */ - S_new[i] = get_FEB(tb); + tb->S_new[i] = get_FEB(tb); /* initialized block type and tree level */ - set_blkh_level(B_BLK_HEAD(S_new[i]), DISK_LEAF_NODE_LEVEL); - - n = B_NR_ITEMS(tbS0); - - switch (flag) { - case M_INSERT: /* insert item */ - - if (n - snum[i] < item_pos) { /* new item or it's part falls to first new node S_new[i] */ - if (item_pos == n - snum[i] + 1 && sbytes[i] != -1) { /* part of new item falls into S_new[i] */ - int old_key_comp, old_len, r_zeros_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, - snum[i] - 1, -1, - 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 - sbytes[i]) << (is_indirect_le_ih(ih) ? tb->tb_sb-> s_blocksize_bits - UNFM_P_SHIFT : 0))); - - put_ih_item_len(ih, sbytes[i]); - - /* Insert part of the item into S_new[i] before 0-th item */ - buffer_info_init_bh(tb, &bi, S_new[i]); - - if ((old_len - sbytes[i]) > zeros_num) { - r_zeros_number = 0; - r_body = body + (old_len - sbytes[i]) - zeros_num; - } else { - r_body = body; - r_zeros_number = zeros_num - (old_len - sbytes[i]); - zeros_num -= r_zeros_number; - } - - leaf_insert_into_buf(&bi, 0, ih, r_body, r_zeros_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 - sbytes[i]); - tb->insert_size[0] -= 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, - snum[i] - 1, sbytes[i], S_new[i]); - - /* Insert new item into S_new[i] */ - buffer_info_init_bh(tb, &bi, S_new[i]); - leaf_insert_into_buf(&bi, item_pos - n + snum[i] - 1, - ih, body, zeros_num); - - zeros_num = tb->insert_size[0] = 0; - } - } - - else { /* new item or it part don't falls into S_new[i] */ + set_blkh_level(B_BLK_HEAD(tb->S_new[i]), DISK_LEAF_NODE_LEVEL); + + if (flag == M_INSERT) + balance_leaf_new_nodes_insert(tb, ih, body, insert_key, + insert_ptr, i); + else /* M_PASTE */ + balance_leaf_new_nodes_paste(tb, ih, body, insert_key, + insert_ptr, i); + + memcpy(insert_key + i, leaf_key(tb->S_new[i], 0), KEY_SIZE); + insert_ptr[i] = tb->S_new[i]; + + RFALSE(!buffer_journaled(tb->S_new[i]) + || buffer_journal_dirty(tb->S_new[i]) + || buffer_dirty(tb->S_new[i]), + "PAP-12247: S_new[%d] : (%b)", + i, tb->S_new[i]); + } +} - leaf_move_items(LEAF_FROM_S_TO_SNEW, tb, - snum[i], sbytes[i], S_new[i]); - } - break; +static void balance_leaf_finish_node_insert(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; + buffer_info_init_tbS0(tb, &bi); + leaf_insert_into_buf(&bi, tb->item_pos, ih, body, tb->zeroes_num); - case M_PASTE: /* append item */ - - if (n - snum[i] <= item_pos) { /* pasted item or part if it falls to S_new[i] */ - if (item_pos == n - snum[i] && 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 = B_N_PITEM_HEAD(tbS0, 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 - sbytes[i] < pos_in_item && 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(sbytes[i] - 1 >= entry_count, - "PAP-12220: there are no so much entries (%d), only %d", - 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, snum[i], sbytes[i] - 1, S_new[i]); - /* Paste given directory entry to directory item */ - buffer_info_init_bh(tb, &bi, S_new[i]); - leaf_paste_in_buffer(&bi, 0, pos_in_item - entry_count + sbytes[i] - 1, - tb->insert_size[0], body, zeros_num); - /* paste new directory entry */ - leaf_paste_entries(&bi, 0, pos_in_item - entry_count + sbytes[i] - 1, 1, - (struct reiserfs_de_head *) body, - body + DEH_SIZE, tb->insert_size[0]); - tb->insert_size[0] = 0; - pos_in_item++; - } else { /* new directory entry doesn't fall into S_new[i] */ - leaf_move_items(LEAF_FROM_S_TO_SNEW,tb, snum[i], sbytes[i], S_new[i]); - } - } else { /* regular object */ - - int n_shift, n_rem, r_zeros_number; - const char *r_body; - - RFALSE(pos_in_item != ih_item_len(B_N_PITEM_HEAD(tbS0, 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 = sbytes[i] - tb->insert_size[0]; - if (n_shift < 0) - n_shift = 0; - leaf_move_items(LEAF_FROM_S_TO_SNEW, tb, snum[i], n_shift, S_new[i]); - - /* Calculate number of bytes which must remain in body after append to S_new[i] */ - n_rem = tb->insert_size[0] - sbytes[i]; - if (n_rem < 0) - n_rem = 0; - /* Append part of body into S_new[0] */ - buffer_info_init_bh(tb, &bi, S_new[i]); - if (n_rem > zeros_num) { - r_zeros_number = 0; - r_body = body + n_rem - zeros_num; - } else { - r_body = body; - r_zeros_number = zeros_num - n_rem; - zeros_num -= r_zeros_number; - } - - leaf_paste_in_buffer(&bi, 0, n_shift, - tb->insert_size[0] - n_rem, - r_body, r_zeros_number); - { - struct item_head *tmp; - - tmp = B_N_PITEM_HEAD(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) - pos_in_item++; - } - } else - /* item falls wholly into S_new[i] */ - { - int leaf_mi; - struct item_head *pasted; + /* If we insert the first key change the delimiting key */ + if (tb->item_pos == 0) { + if (tb->CFL[0]) /* can be 0 in reiserfsck */ + replace_key(tb, tb->CFL[0], tb->lkey[0], tbS0, 0); -#ifdef CONFIG_REISERFS_CHECK - struct item_head *ih_check = B_N_PITEM_HEAD(tbS0, item_pos); - - if (!is_direntry_le_ih(ih_check) - && (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, snum[i], - sbytes[i], - 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, S_new[i]); - leaf_paste_in_buffer(&bi, - item_pos - n + snum[i], - pos_in_item, - tb->insert_size[0], - body, zeros_num); - - pasted = B_N_PITEM_HEAD(S_new[i], item_pos - n + snum[i]); - if (is_direntry_le_ih(pasted)) { - leaf_paste_entries(&bi, - item_pos - n + snum[i], - 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); - zeros_num = tb->insert_size[0] = 0; - } - } + } +} - else { /* pasted item doesn't fall into S_new[i] */ +static void balance_leaf_finish_node_paste_dirent(struct tree_balance *tb, + struct item_head *ih, + const char *body) +{ + struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path); + struct item_head *pasted = item_head(tbS0, tb->item_pos); + struct buffer_info bi; - leaf_move_items(LEAF_FROM_S_TO_SNEW, tb, - snum[i], sbytes[i], S_new[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); + if (tb->pos_in_item >= 0 && tb->pos_in_item <= ih_entry_count(pasted)) { + RFALSE(!tb->insert_size[0], + "PAP-12260: insert_size is 0 already"); + + /* prepare space */ + buffer_info_init_tbS0(tb, &bi); + leaf_paste_in_buffer(&bi, tb->item_pos, tb->pos_in_item, + tb->insert_size[0], body, tb->zeroes_num); + + /* paste entry */ + leaf_paste_entries(&bi, tb->item_pos, tb->pos_in_item, 1, + (struct reiserfs_de_head *)body, + body + DEH_SIZE, tb->insert_size[0]); + + if (!tb->item_pos && !tb->pos_in_item) { + RFALSE(!tb->CFL[0] || !tb->L[0], + "PAP-12270: CFL[0]/L[0] must be specified"); + if (tb->CFL[0]) + replace_key(tb, tb->CFL[0], tb->lkey[0], + tbS0, 0); } - memcpy(insert_key + i, B_N_PKEY(S_new[i], 0), KEY_SIZE); - insert_ptr[i] = S_new[i]; + tb->insert_size[0] = 0; + } +} + +static void balance_leaf_finish_node_paste(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; + struct item_head *pasted = item_head(tbS0, tb->item_pos); - RFALSE(!buffer_journaled(S_new[i]) - || buffer_journal_dirty(S_new[i]) - || buffer_dirty(S_new[i]), "PAP-12247: S_new[%d] : (%b)", - i, S_new[i]); + /* when directory, may be new entry already pasted */ + if (is_direntry_le_ih(pasted)) { + balance_leaf_finish_node_paste_dirent(tb, ih, body); + return; } - /* if the affected item was not wholly shifted then we perform all necessary operations on that part or whole of the - affected item which remains in S */ - if (0 <= item_pos && item_pos < tb->s0num) { /* if we must insert or append into buffer S[0] */ + /* regular object */ - switch (flag) { - case M_INSERT: /* insert item into S[0] */ - buffer_info_init_tbS0(tb, &bi); - leaf_insert_into_buf(&bi, item_pos, ih, body, - zeros_num); + if (tb->pos_in_item == ih_item_len(pasted)) { + RFALSE(tb->insert_size[0] <= 0, + "PAP-12275: insert size must not be %d", + tb->insert_size[0]); + buffer_info_init_tbS0(tb, &bi); + leaf_paste_in_buffer(&bi, tb->item_pos, + tb->pos_in_item, tb->insert_size[0], body, + tb->zeroes_num); - /* If we insert the first key change the delimiting key */ - if (item_pos == 0) { - if (tb->CFL[0]) /* can be 0 in reiserfsck */ - replace_key(tb, tb->CFL[0], tb->lkey[0], tbS0, 0); - } - break; + if (is_indirect_le_ih(pasted)) + set_ih_free_space(pasted, 0); - case M_PASTE:{ /* append item in S[0] */ - struct item_head *pasted; - - pasted = B_N_PITEM_HEAD(tbS0, item_pos); - /* when directory, may be new entry already pasted */ - if (is_direntry_le_ih(pasted)) { - if (pos_in_item >= 0 && pos_in_item <= ih_entry_count(pasted)) { - - RFALSE(!tb->insert_size[0], - "PAP-12260: insert_size is 0 already"); - - /* prepare space */ - buffer_info_init_tbS0(tb, &bi); - leaf_paste_in_buffer(&bi, item_pos, pos_in_item, - tb->insert_size[0], body, - zeros_num); - - /* paste entry */ - leaf_paste_entries(&bi, item_pos, pos_in_item, 1, - (struct reiserfs_de_head *)body, - body + DEH_SIZE, - tb->insert_size[0]); - if (!item_pos && !pos_in_item) { - RFALSE(!tb->CFL[0] || !tb->L[0], - "PAP-12270: CFL[0]/L[0] must be specified"); - if (tb->CFL[0]) - replace_key(tb, tb->CFL[0], tb->lkey[0], tbS0, 0); - } - tb->insert_size[0] = 0; - } - } else { /* regular object */ - if (pos_in_item == ih_item_len(pasted)) { - - RFALSE(tb->insert_size[0] <= 0, - "PAP-12275: insert size must not be %d", - tb->insert_size[0]); - buffer_info_init_tbS0(tb, &bi); - leaf_paste_in_buffer(&bi, item_pos, pos_in_item, - tb->insert_size[0], body, zeros_num); - - if (is_indirect_le_ih(pasted)) { -#if 0 - RFALSE(tb-> - insert_size[0] != - UNFM_P_SIZE, - "PAP-12280: insert_size for indirect item must be %d, not %d", - UNFM_P_SIZE, - tb-> - insert_size[0]); -#endif - set_ih_free_space(pasted, 0); - } - tb->insert_size[0] = 0; - } + tb->insert_size[0] = 0; + } #ifdef CONFIG_REISERFS_CHECK - else { - if (tb->insert_size[0]) { - print_cur_tb("12285"); - reiserfs_panic(tb->tb_sb, - "PAP-12285", - "insert_size " - "must be 0 " - "(%d)", - tb->insert_size[0]); - } - } -#endif /* CONFIG_REISERFS_CHECK */ - - } - } /* case M_PASTE: */ + else if (tb->insert_size[0]) { + print_cur_tb("12285"); + reiserfs_panic(tb->tb_sb, "PAP-12285", + "insert_size must be 0 (%d)", tb->insert_size[0]); + } +#endif +} + +/* + * if the affected item was not wholly shifted then we + * perform all necessary operations on that part or whole + * of the affected item which remains in S + */ +static void balance_leaf_finish_node(struct tree_balance *tb, + struct item_head *ih, + const char *body, int flag) +{ + /* if we must insert or append into buffer S[0] */ + if (0 <= tb->item_pos && tb->item_pos < tb->s0num) { + if (flag == M_INSERT) + balance_leaf_finish_node_insert(tb, ih, body); + else /* M_PASTE */ + balance_leaf_finish_node_paste(tb, ih, body); + } +} + +/** + * balance_leaf - reiserfs tree balancing algorithm + * @tb: tree balance state + * @ih: item header of inserted item (little endian) + * @body: body of inserted item or bytes to paste + * @flag: i - insert, d - delete, c - cut, p - paste (see do_balance) + * passed back: + * @insert_key: key to insert new nodes + * @insert_ptr: array of nodes to insert at the next level + * + * In our processing of one level we sometimes determine what must be + * inserted into the next higher level. This insertion consists of a + * key or two keys and their corresponding pointers. + */ +static int balance_leaf(struct tree_balance *tb, struct item_head *ih, + const char *body, int flag, + struct item_head *insert_key, + struct buffer_head **insert_ptr) +{ + struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path); + + PROC_INFO_INC(tb->tb_sb, balance_at[0]); + + /* Make balance in case insert_size[0] < 0 */ + if (tb->insert_size[0] < 0) + return balance_leaf_when_delete(tb, flag); + + tb->item_pos = PATH_LAST_POSITION(tb->tb_path), + tb->pos_in_item = tb->tb_path->pos_in_item, + tb->zeroes_num = 0; + if (flag == M_INSERT && !body) + tb->zeroes_num = ih_item_len(ih); + + /* + * for indirect item pos_in_item is measured in unformatted node + * pointers. Recalculate to bytes + */ + if (flag != M_INSERT + && is_indirect_le_ih(item_head(tbS0, tb->item_pos))) + tb->pos_in_item *= UNFM_P_SIZE; + + balance_leaf_left(tb, ih, body, flag); + + /* tb->lnum[0] > 0 */ + /* Calculate new item position */ + tb->item_pos -= (tb->lnum[0] - ((tb->lbytes != -1) ? 1 : 0)); + + balance_leaf_right(tb, ih, body, flag); + + /* tb->rnum[0] > 0 */ + RFALSE(tb->blknum[0] > 3, + "PAP-12180: blknum can not be %d. It must be <= 3", tb->blknum[0]); + RFALSE(tb->blknum[0] < 0, + "PAP-12185: blknum can not be %d. It must be >= 0", tb->blknum[0]); + + /* + * if while adding to a node we discover that it is possible to split + * it in two, and merge the left part into the left neighbor and the + * right part into the right neighbor, eliminating the node + */ + if (tb->blknum[0] == 0) { /* node S[0] is empty now */ + + RFALSE(!tb->lnum[0] || !tb->rnum[0], + "PAP-12190: lnum and rnum must not be zero"); + /* + * if insertion was done before 0-th position in R[0], right + * delimiting key of the tb->L[0]'s and left delimiting key are + * not set correctly + */ + if (tb->CFL[0]) { + if (!tb->CFR[0]) + reiserfs_panic(tb->tb_sb, "vs-12195", + "CFR not initialized"); + copy_key(internal_key(tb->CFL[0], tb->lkey[0]), + internal_key(tb->CFR[0], tb->rkey[0])); + do_balance_mark_internal_dirty(tb, tb->CFL[0], 0); } + + reiserfs_invalidate_buffer(tb, tbS0); + return 0; } + + balance_leaf_new_nodes(tb, ih, body, insert_key, insert_ptr, flag); + + balance_leaf_finish_node(tb, ih, body, flag); + #ifdef CONFIG_REISERFS_CHECK if (flag == M_PASTE && tb->insert_size[0]) { print_cur_tb("12290"); @@ -1137,9 +1454,11 @@ static int balance_leaf(struct tree_balance *tb, struct item_head *ih, /* item h "PAP-12290", "insert_size is still not 0 (%d)", tb->insert_size[0]); } -#endif /* CONFIG_REISERFS_CHECK */ +#endif + + /* Leaf level of the tree is balanced (end of balance_leaf) */ return 0; -} /* Leaf level of the tree is balanced (end of balance_leaf) */ +} /* Make empty node */ void make_empty_node(struct buffer_info *bi) @@ -1178,9 +1497,7 @@ struct buffer_head *get_FEB(struct tree_balance *tb) return tb->used[i]; } -/* This is now used because reiserfs_free_block has to be able to -** schedule. -*/ +/* This is now used because reiserfs_free_block has to be able to schedule. */ static void store_thrown(struct tree_balance *tb, struct buffer_head *bh) { int i; @@ -1246,10 +1563,10 @@ void replace_key(struct tree_balance *tb, struct buffer_head *dest, int n_dest, if (B_IS_ITEMS_LEVEL(src)) /* source buffer contains leaf node */ - memcpy(B_N_PDELIM_KEY(dest, n_dest), B_N_PITEM_HEAD(src, n_src), + memcpy(internal_key(dest, n_dest), item_head(src, n_src), KEY_SIZE); else - memcpy(B_N_PDELIM_KEY(dest, n_dest), B_N_PDELIM_KEY(src, n_src), + memcpy(internal_key(dest, n_dest), internal_key(src, n_src), KEY_SIZE); do_balance_mark_internal_dirty(tb, dest, 0); @@ -1335,8 +1652,10 @@ static int check_before_balancing(struct tree_balance *tb) "mount point."); } - /* double check that buffers that we will modify are unlocked. (fix_nodes should already have - prepped all of these for us). */ + /* + * double check that buffers that we will modify are unlocked. + * (fix_nodes should already have prepped all of these for us). + */ if (tb->lnum[0]) { retval |= locked_or_not_in_tree(tb, tb->L[0], "L[0]"); retval |= locked_or_not_in_tree(tb, tb->FL[0], "FL[0]"); @@ -1429,49 +1748,51 @@ static void check_internal_levels(struct tree_balance *tb) #endif -/* Now we have all of the buffers that must be used in balancing of - the tree. We rely on the assumption that schedule() will not occur - while do_balance works. ( Only interrupt handlers are acceptable.) - We balance the tree according to the analysis made before this, - using buffers already obtained. For SMP support it will someday be - necessary to add ordered locking of tb. */ - -/* Some interesting rules of balancing: - - we delete a maximum of two nodes per level per balancing: we never - delete R, when we delete two of three nodes L, S, R then we move - them into R. - - we only delete L if we are deleting two nodes, if we delete only - one node we delete S - - if we shift leaves then we shift as much as we can: this is a - deliberate policy of extremism in node packing which results in - higher average utilization after repeated random balance operations - at the cost of more memory copies and more balancing as a result of - small insertions to full nodes. - - if we shift internal nodes we try to evenly balance the node - utilization, with consequent less balancing at the cost of lower - utilization. - - one could argue that the policy for directories in leaves should be - that of internal nodes, but we will wait until another day to - evaluate this.... It would be nice to someday measure and prove - these assumptions as to what is optimal.... +/* + * Now we have all of the buffers that must be used in balancing of + * the tree. We rely on the assumption that schedule() will not occur + * while do_balance works. ( Only interrupt handlers are acceptable.) + * We balance the tree according to the analysis made before this, + * using buffers already obtained. For SMP support it will someday be + * necessary to add ordered locking of tb. + */ -*/ +/* + * Some interesting rules of balancing: + * we delete a maximum of two nodes per level per balancing: we never + * delete R, when we delete two of three nodes L, S, R then we move + * them into R. + * + * we only delete L if we are deleting two nodes, if we delete only + * one node we delete S + * + * if we shift leaves then we shift as much as we can: this is a + * deliberate policy of extremism in node packing which results in + * higher average utilization after repeated random balance operations + * at the cost of more memory copies and more balancing as a result of + * small insertions to full nodes. + * + * if we shift internal nodes we try to evenly balance the node + * utilization, with consequent less balancing at the cost of lower + * utilization. + * + * one could argue that the policy for directories in leaves should be + * that of internal nodes, but we will wait until another day to + * evaluate this.... It would be nice to someday measure and prove + * these assumptions as to what is optimal.... + */ static inline void do_balance_starts(struct tree_balance *tb) { - /* use print_cur_tb() to see initial state of struct - tree_balance */ + /* use print_cur_tb() to see initial state of struct tree_balance */ /* store_print_tb (tb); */ /* do not delete, just comment it out */ -/* print_tb(flag, PATH_LAST_POSITION(tb->tb_path), tb->tb_path->pos_in_item, tb, - "check");*/ + /* + print_tb(flag, PATH_LAST_POSITION(tb->tb_path), + tb->tb_path->pos_in_item, tb, "check"); + */ RFALSE(check_before_balancing(tb), "PAP-12340: locked buffers in TB"); #ifdef CONFIG_REISERFS_CHECK REISERFS_SB(tb->tb_sb)->cur_tb = tb; @@ -1487,9 +1808,10 @@ static inline void do_balance_completed(struct tree_balance *tb) REISERFS_SB(tb->tb_sb)->cur_tb = NULL; #endif - /* reiserfs_free_block is no longer schedule safe. So, we need to - ** put the buffers we want freed on the thrown list during do_balance, - ** and then free them now + /* + * reiserfs_free_block is no longer schedule safe. So, we need to + * put the buffers we want freed on the thrown list during do_balance, + * and then free them now */ REISERFS_SB(tb->tb_sb)->s_do_balance++; @@ -1500,36 +1822,40 @@ static inline void do_balance_completed(struct tree_balance *tb) free_thrown(tb); } -void do_balance(struct tree_balance *tb, /* tree_balance structure */ - struct item_head *ih, /* item header of inserted item */ - const char *body, /* body of inserted item or bytes to paste */ - int flag) -{ /* i - insert, d - delete - c - cut, p - paste - - Cut means delete part of an item - (includes removing an entry from a - directory). - - Delete means delete whole item. - - Insert means add a new item into the - tree. - - Paste means to append to the end of an - existing file or to insert a directory - entry. */ - int child_pos, /* position of a child node in its parent */ - h; /* level of the tree being processed */ - struct item_head insert_key[2]; /* in our processing of one level - we sometimes determine what - must be inserted into the next - higher level. This insertion - consists of a key or two keys - and their corresponding - pointers */ - struct buffer_head *insert_ptr[2]; /* inserted node-ptrs for the next - level */ +/* + * do_balance - balance the tree + * + * @tb: tree_balance structure + * @ih: item header of inserted item + * @body: body of inserted item or bytes to paste + * @flag: 'i' - insert, 'd' - delete, 'c' - cut, 'p' paste + * + * Cut means delete part of an item (includes removing an entry from a + * directory). + * + * Delete means delete whole item. + * + * Insert means add a new item into the tree. + * + * Paste means to append to the end of an existing file or to + * insert a directory entry. + */ +void do_balance(struct tree_balance *tb, struct item_head *ih, + const char *body, int flag) +{ + int child_pos; /* position of a child node in its parent */ + int h; /* level of the tree being processed */ + + /* + * in our processing of one level we sometimes determine what + * must be inserted into the next higher level. This insertion + * consists of a key or two keys and their corresponding + * pointers + */ + struct item_head insert_key[2]; + + /* inserted node-ptrs for the next level */ + struct buffer_head *insert_ptr[2]; tb->tb_mode = flag; tb->need_balance_dirty = 0; @@ -1546,12 +1872,14 @@ void do_balance(struct tree_balance *tb, /* tree_balance structure */ return; } - atomic_inc(&(fs_generation(tb->tb_sb))); + atomic_inc(&fs_generation(tb->tb_sb)); do_balance_starts(tb); - /* balance leaf returns 0 except if combining L R and S into - one node. see balance_internal() for explanation of this - line of code. */ + /* + * balance_leaf returns 0 except if combining L R and S into + * one node. see balance_internal() for explanation of this + * line of code. + */ child_pos = PATH_H_B_ITEM_ORDER(tb->tb_path, 0) + balance_leaf(tb, ih, body, flag, insert_key, insert_ptr); @@ -1561,9 +1889,8 @@ void do_balance(struct tree_balance *tb, /* tree_balance structure */ /* Balance internal level of the tree. */ for (h = 1; h < MAX_HEIGHT && tb->insert_size[h]; h++) - child_pos = - balance_internal(tb, h, child_pos, insert_key, insert_ptr); + child_pos = balance_internal(tb, h, child_pos, insert_key, + insert_ptr); do_balance_completed(tb); - } |