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![Jörn Engel](/assets/img/avatar_default.png)
Signed-off-by: Jörn Engel <joern@wohnheim.fh-wedel.de> Signed-off-by: Adrian Bunk <bunk@stusta.de>
2136 lines
58 KiB
C
2136 lines
58 KiB
C
/*
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* Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
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*/
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/* Now we have all buffers that must be used in balancing of the tree */
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/* Further calculations can not cause schedule(), and thus the buffer */
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/* tree will be stable until the balancing will be finished */
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/* balance the tree according to the analysis made before, */
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/* and using buffers obtained after all above. */
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/**
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** balance_leaf_when_delete
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** balance_leaf
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** do_balance
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**
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**/
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#include <asm/uaccess.h>
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#include <linux/time.h>
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#include <linux/reiserfs_fs.h>
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#include <linux/buffer_head.h>
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#ifdef CONFIG_REISERFS_CHECK
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struct tree_balance *cur_tb = NULL; /* detects whether more than one
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copy of tb exists as a means
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of checking whether schedule
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is interrupting do_balance */
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#endif
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inline void do_balance_mark_leaf_dirty(struct tree_balance *tb,
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struct buffer_head *bh, int flag)
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{
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journal_mark_dirty(tb->transaction_handle,
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tb->transaction_handle->t_super, bh);
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}
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#define do_balance_mark_internal_dirty do_balance_mark_leaf_dirty
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#define do_balance_mark_sb_dirty do_balance_mark_leaf_dirty
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/* summary:
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if deleting something ( tb->insert_size[0] < 0 )
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return(balance_leaf_when_delete()); (flag d handled here)
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else
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if lnum is larger than 0 we put items into the left node
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if rnum is larger than 0 we put items into the right node
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if snum1 is larger than 0 we put items into the new node s1
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if snum2 is larger than 0 we put items into the new node s2
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Note that all *num* count new items being created.
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It would be easier to read balance_leaf() if each of these summary
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lines was a separate procedure rather than being inlined. I think
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that there are many passages here and in balance_leaf_when_delete() in
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which two calls to one procedure can replace two passages, and it
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might save cache space and improve software maintenance costs to do so.
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Vladimir made the perceptive comment that we should offload most of
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the decision making in this function into fix_nodes/check_balance, and
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then create some sort of structure in tb that says what actions should
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be performed by do_balance.
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-Hans */
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/* Balance leaf node in case of delete or cut: insert_size[0] < 0
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*
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* lnum, rnum can have values >= -1
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* -1 means that the neighbor must be joined with S
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* 0 means that nothing should be done with the neighbor
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* >0 means to shift entirely or partly the specified number of items to the neighbor
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*/
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static int balance_leaf_when_delete(struct tree_balance *tb, int flag)
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{
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struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
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int item_pos = PATH_LAST_POSITION(tb->tb_path);
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int pos_in_item = tb->tb_path->pos_in_item;
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struct buffer_info bi;
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int n;
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struct item_head *ih;
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RFALSE(tb->FR[0] && B_LEVEL(tb->FR[0]) != DISK_LEAF_NODE_LEVEL + 1,
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"vs- 12000: level: wrong FR %z", tb->FR[0]);
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RFALSE(tb->blknum[0] > 1,
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"PAP-12005: tb->blknum == %d, can not be > 1", tb->blknum[0]);
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RFALSE(!tb->blknum[0] && !PATH_H_PPARENT(tb->tb_path, 0),
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"PAP-12010: tree can not be empty");
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ih = B_N_PITEM_HEAD(tbS0, item_pos);
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/* Delete or truncate the item */
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switch (flag) {
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case M_DELETE: /* delete item in S[0] */
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RFALSE(ih_item_len(ih) + IH_SIZE != -tb->insert_size[0],
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"vs-12013: mode Delete, insert size %d, ih to be deleted %h",
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-tb->insert_size[0], ih);
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bi.tb = tb;
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bi.bi_bh = tbS0;
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bi.bi_parent = PATH_H_PPARENT(tb->tb_path, 0);
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bi.bi_position = PATH_H_POSITION(tb->tb_path, 1);
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leaf_delete_items(&bi, 0, item_pos, 1, -1);
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if (!item_pos && tb->CFL[0]) {
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if (B_NR_ITEMS(tbS0)) {
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replace_key(tb, tb->CFL[0], tb->lkey[0], tbS0,
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0);
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} else {
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if (!PATH_H_POSITION(tb->tb_path, 1))
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replace_key(tb, tb->CFL[0], tb->lkey[0],
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PATH_H_PPARENT(tb->tb_path,
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0), 0);
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}
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}
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RFALSE(!item_pos && !tb->CFL[0],
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"PAP-12020: tb->CFL[0]==%p, tb->L[0]==%p", tb->CFL[0],
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tb->L[0]);
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break;
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case M_CUT:{ /* cut item in S[0] */
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bi.tb = tb;
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bi.bi_bh = tbS0;
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bi.bi_parent = PATH_H_PPARENT(tb->tb_path, 0);
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bi.bi_position = PATH_H_POSITION(tb->tb_path, 1);
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if (is_direntry_le_ih(ih)) {
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/* UFS unlink semantics are such that you can only delete one directory entry at a time. */
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/* when we cut a directory tb->insert_size[0] means number of entries to be cut (always 1) */
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tb->insert_size[0] = -1;
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leaf_cut_from_buffer(&bi, item_pos, pos_in_item,
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-tb->insert_size[0]);
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RFALSE(!item_pos && !pos_in_item && !tb->CFL[0],
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"PAP-12030: can not change delimiting key. CFL[0]=%p",
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tb->CFL[0]);
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if (!item_pos && !pos_in_item && tb->CFL[0]) {
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replace_key(tb, tb->CFL[0], tb->lkey[0],
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tbS0, 0);
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}
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} else {
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leaf_cut_from_buffer(&bi, item_pos, pos_in_item,
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-tb->insert_size[0]);
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RFALSE(!ih_item_len(ih),
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"PAP-12035: cut must leave non-zero dynamic length of item");
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}
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break;
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}
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default:
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print_cur_tb("12040");
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reiserfs_panic(tb->tb_sb,
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"PAP-12040: balance_leaf_when_delete: unexpectable mode: %s(%d)",
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(flag ==
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M_PASTE) ? "PASTE" : ((flag ==
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M_INSERT) ? "INSERT" :
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"UNKNOWN"), flag);
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}
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/* the rule is that no shifting occurs unless by shifting a node can be freed */
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n = B_NR_ITEMS(tbS0);
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if (tb->lnum[0]) { /* L[0] takes part in balancing */
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if (tb->lnum[0] == -1) { /* L[0] must be joined with S[0] */
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if (tb->rnum[0] == -1) { /* R[0] must be also joined with S[0] */
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if (tb->FR[0] == PATH_H_PPARENT(tb->tb_path, 0)) {
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/* all contents of all the 3 buffers will be in L[0] */
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if (PATH_H_POSITION(tb->tb_path, 1) == 0
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&& 1 < B_NR_ITEMS(tb->FR[0]))
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replace_key(tb, tb->CFL[0],
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tb->lkey[0],
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tb->FR[0], 1);
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leaf_move_items(LEAF_FROM_S_TO_L, tb, n,
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-1, NULL);
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leaf_move_items(LEAF_FROM_R_TO_L, tb,
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B_NR_ITEMS(tb->R[0]),
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-1, NULL);
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reiserfs_invalidate_buffer(tb, tbS0);
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reiserfs_invalidate_buffer(tb,
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tb->R[0]);
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return 0;
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}
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/* all contents of all the 3 buffers will be in R[0] */
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leaf_move_items(LEAF_FROM_S_TO_R, tb, n, -1,
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NULL);
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leaf_move_items(LEAF_FROM_L_TO_R, tb,
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B_NR_ITEMS(tb->L[0]), -1, NULL);
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/* right_delimiting_key is correct in R[0] */
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replace_key(tb, tb->CFR[0], tb->rkey[0],
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tb->R[0], 0);
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reiserfs_invalidate_buffer(tb, tbS0);
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reiserfs_invalidate_buffer(tb, tb->L[0]);
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return -1;
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}
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RFALSE(tb->rnum[0] != 0,
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"PAP-12045: rnum must be 0 (%d)", tb->rnum[0]);
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/* all contents of L[0] and S[0] will be in L[0] */
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leaf_shift_left(tb, n, -1);
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reiserfs_invalidate_buffer(tb, tbS0);
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return 0;
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}
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/* a part of contents of S[0] will be in L[0] and the rest part of S[0] will be in R[0] */
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RFALSE((tb->lnum[0] + tb->rnum[0] < n) ||
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(tb->lnum[0] + tb->rnum[0] > n + 1),
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"PAP-12050: rnum(%d) and lnum(%d) and item number(%d) in S[0] are not consistent",
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tb->rnum[0], tb->lnum[0], n);
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RFALSE((tb->lnum[0] + tb->rnum[0] == n) &&
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(tb->lbytes != -1 || tb->rbytes != -1),
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"PAP-12055: bad rbytes (%d)/lbytes (%d) parameters when items are not split",
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tb->rbytes, tb->lbytes);
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RFALSE((tb->lnum[0] + tb->rnum[0] == n + 1) &&
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(tb->lbytes < 1 || tb->rbytes != -1),
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"PAP-12060: bad rbytes (%d)/lbytes (%d) parameters when items are split",
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tb->rbytes, tb->lbytes);
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leaf_shift_left(tb, tb->lnum[0], tb->lbytes);
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leaf_shift_right(tb, tb->rnum[0], tb->rbytes);
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reiserfs_invalidate_buffer(tb, tbS0);
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return 0;
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}
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if (tb->rnum[0] == -1) {
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/* all contents of R[0] and S[0] will be in R[0] */
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leaf_shift_right(tb, n, -1);
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reiserfs_invalidate_buffer(tb, tbS0);
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return 0;
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}
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RFALSE(tb->rnum[0],
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"PAP-12065: bad rnum parameter must be 0 (%d)", tb->rnum[0]);
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return 0;
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}
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static int balance_leaf(struct tree_balance *tb, struct item_head *ih, /* item header of inserted item (this is on little endian) */
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const char *body, /* body of inserted item or bytes to paste */
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int flag, /* i - insert, d - delete, c - cut, p - paste
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(see comment to do_balance) */
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struct item_head *insert_key, /* in our processing of one level we sometimes determine what
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must be inserted into the next higher level. This insertion
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consists of a key or two keys and their corresponding
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pointers */
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struct buffer_head **insert_ptr /* inserted node-ptrs for the next level */
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)
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{
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struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
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int item_pos = PATH_LAST_POSITION(tb->tb_path); /* index into the array of item headers in S[0]
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of the affected item */
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struct buffer_info bi;
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struct buffer_head *S_new[2]; /* new nodes allocated to hold what could not fit into S */
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int snum[2]; /* number of items that will be placed
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into S_new (includes partially shifted
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items) */
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int sbytes[2]; /* if an item is partially shifted into S_new then
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if it is a directory item
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it is the number of entries from the item that are shifted into S_new
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else
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it is the number of bytes from the item that are shifted into S_new
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*/
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int n, i;
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int ret_val;
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int pos_in_item;
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int zeros_num;
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PROC_INFO_INC(tb->tb_sb, balance_at[0]);
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/* Make balance in case insert_size[0] < 0 */
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if (tb->insert_size[0] < 0)
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return balance_leaf_when_delete(tb, flag);
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zeros_num = 0;
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if (flag == M_INSERT && body == 0)
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zeros_num = ih_item_len(ih);
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pos_in_item = tb->tb_path->pos_in_item;
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/* for indirect item pos_in_item is measured in unformatted node
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pointers. Recalculate to bytes */
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if (flag != M_INSERT
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&& is_indirect_le_ih(B_N_PITEM_HEAD(tbS0, item_pos)))
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pos_in_item *= UNFM_P_SIZE;
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if (tb->lnum[0] > 0) {
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/* Shift lnum[0] items from S[0] to the left neighbor L[0] */
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if (item_pos < tb->lnum[0]) {
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/* new item or it part falls to L[0], shift it too */
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n = B_NR_ITEMS(tb->L[0]);
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switch (flag) {
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case M_INSERT: /* insert item into L[0] */
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if (item_pos == tb->lnum[0] - 1
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&& tb->lbytes != -1) {
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/* part of new item falls into L[0] */
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int new_item_len;
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int version;
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ret_val =
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leaf_shift_left(tb, tb->lnum[0] - 1,
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-1);
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/* Calculate item length to insert to S[0] */
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new_item_len =
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ih_item_len(ih) - tb->lbytes;
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/* Calculate and check item length to insert to L[0] */
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put_ih_item_len(ih,
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ih_item_len(ih) -
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new_item_len);
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RFALSE(ih_item_len(ih) <= 0,
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"PAP-12080: there is nothing to insert into L[0]: ih_item_len=%d",
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ih_item_len(ih));
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/* Insert new item into L[0] */
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bi.tb = tb;
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bi.bi_bh = tb->L[0];
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bi.bi_parent = tb->FL[0];
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bi.bi_position =
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get_left_neighbor_position(tb, 0);
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leaf_insert_into_buf(&bi,
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n + item_pos -
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ret_val, ih, body,
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zeros_num >
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ih_item_len(ih) ?
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ih_item_len(ih) :
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zeros_num);
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version = ih_version(ih);
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/* Calculate key component, item length and body to insert into S[0] */
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set_le_ih_k_offset(ih,
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le_ih_k_offset(ih) +
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(tb->
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lbytes <<
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(is_indirect_le_ih
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(ih) ? tb->tb_sb->
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s_blocksize_bits -
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UNFM_P_SHIFT :
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0)));
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put_ih_item_len(ih, new_item_len);
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if (tb->lbytes > zeros_num) {
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body +=
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(tb->lbytes - zeros_num);
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zeros_num = 0;
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} else
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zeros_num -= tb->lbytes;
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RFALSE(ih_item_len(ih) <= 0,
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"PAP-12085: there is nothing to insert into S[0]: ih_item_len=%d",
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ih_item_len(ih));
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} else {
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/* new item in whole falls into L[0] */
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/* Shift lnum[0]-1 items to L[0] */
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ret_val =
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leaf_shift_left(tb, tb->lnum[0] - 1,
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tb->lbytes);
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/* Insert new item into L[0] */
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bi.tb = tb;
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bi.bi_bh = tb->L[0];
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bi.bi_parent = tb->FL[0];
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bi.bi_position =
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get_left_neighbor_position(tb, 0);
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leaf_insert_into_buf(&bi,
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n + item_pos -
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ret_val, ih, body,
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zeros_num);
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tb->insert_size[0] = 0;
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zeros_num = 0;
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}
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break;
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case M_PASTE: /* append item in L[0] */
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if (item_pos == tb->lnum[0] - 1
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&& 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
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(B_N_PITEM_HEAD(tbS0, item_pos))) {
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RFALSE(zeros_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 > pos_in_item) {
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/* new directory entry falls into L[0] */
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struct item_head
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*pasted;
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int l_pos_in_item =
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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 =
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leaf_shift_left(tb,
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tb->
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lnum
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[0],
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tb->
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lbytes
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-
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1);
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if (ret_val
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&& !item_pos) {
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pasted =
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B_N_PITEM_HEAD
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(tb->L[0],
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B_NR_ITEMS
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(tb->
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L[0]) -
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1);
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l_pos_in_item +=
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I_ENTRY_COUNT
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(pasted) -
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(tb->
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lbytes -
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1);
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}
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/* Append given directory entry to directory item */
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bi.tb = tb;
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bi.bi_bh = tb->L[0];
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bi.bi_parent =
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tb->FL[0];
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bi.bi_position =
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get_left_neighbor_position
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(tb, 0);
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leaf_paste_in_buffer
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(&bi,
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n + item_pos -
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ret_val,
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l_pos_in_item,
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tb->insert_size[0],
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body, zeros_num);
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/* previous string prepared space for pasting new entry, following string pastes this entry */
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|
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/* when we have merge directory item, pos_in_item 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.
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bi_bh,
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n +
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item_pos
|
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-
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ret_val,
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l_pos_in_item,
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1,
|
|
(struct
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reiserfs_de_head
|
|
*)
|
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body,
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body
|
|
+
|
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DEH_SIZE,
|
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tb->
|
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insert_size
|
|
[0]
|
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);
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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] */
|
|
/* 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] */
|
|
bi.tb = tb;
|
|
bi.bi_bh = tb->L[0];
|
|
bi.bi_parent =
|
|
tb->FL[0];
|
|
bi.bi_position =
|
|
get_left_neighbor_position
|
|
(tb, 0);
|
|
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] */
|
|
bi.tb = tb;
|
|
bi.bi_bh = tb->L[0];
|
|
bi.bi_parent = tb->FL[0];
|
|
bi.bi_position =
|
|
get_left_neighbor_position(tb, 0);
|
|
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.bi_bh,
|
|
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: balance_leaf: lnum > 0: unexpectable 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);
|
|
}
|
|
}
|
|
|
|
/* 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] */
|
|
bi.tb = tb;
|
|
bi.bi_bh = tb->R[0];
|
|
bi.bi_parent = tb->FR[0];
|
|
bi.bi_position =
|
|
get_right_neighbor_position(tb, 0);
|
|
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] */
|
|
bi.tb = tb;
|
|
bi.bi_bh = tb->R[0];
|
|
bi.bi_parent = tb->FR[0];
|
|
bi.bi_position =
|
|
get_right_neighbor_position(tb, 0);
|
|
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;
|
|
|
|
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;
|
|
bi.tb = tb;
|
|
bi.bi_bh = tb->R[0];
|
|
bi.bi_parent =
|
|
tb->FR[0];
|
|
bi.bi_position =
|
|
get_right_neighbor_position
|
|
(tb, 0);
|
|
leaf_paste_in_buffer
|
|
(&bi, 0,
|
|
paste_entry_position,
|
|
tb->insert_size[0],
|
|
body, zeros_num);
|
|
/* paste entry */
|
|
leaf_paste_entries(bi.
|
|
bi_bh,
|
|
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] */
|
|
bi.tb = tb;
|
|
bi.bi_bh = tb->R[0];
|
|
bi.bi_parent = tb->FR[0];
|
|
bi.bi_position =
|
|
get_right_neighbor_position
|
|
(tb, 0);
|
|
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) {
|
|
bi.tb = tb;
|
|
bi.bi_bh = tb->R[0];
|
|
bi.bi_parent = tb->FR[0];
|
|
bi.bi_position =
|
|
get_right_neighbor_position
|
|
(tb, 0);
|
|
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.bi_bh,
|
|
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: balance_leaf: rnum > 0: unexpectable mode: %s(%d)",
|
|
(flag ==
|
|
M_DELETE) ? "DELETE" : ((flag ==
|
|
M_CUT) ? "CUT"
|
|
: "UNKNOWN"),
|
|
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: balance_leaf: 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);
|
|
}
|
|
|
|
reiserfs_invalidate_buffer(tb, tbS0);
|
|
return 0;
|
|
}
|
|
|
|
/* Fill new nodes that appear in place of S[0] */
|
|
|
|
/* 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;
|
|
for (i = tb->blknum[0] - 2; i >= 0; i--) {
|
|
|
|
RFALSE(!snum[i], "PAP-12200: snum[%d] == %d. Must be > 0", i,
|
|
snum[i]);
|
|
|
|
/* here we shift from S to S_new nodes */
|
|
|
|
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 */
|
|
bi.tb = tb;
|
|
bi.bi_bh = S_new[i];
|
|
bi.bi_parent = NULL;
|
|
bi.bi_position = 0;
|
|
|
|
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] */
|
|
bi.tb = tb;
|
|
bi.bi_bh = S_new[i];
|
|
bi.bi_parent = NULL;
|
|
bi.bi_position = 0;
|
|
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] */
|
|
|
|
leaf_move_items(LEAF_FROM_S_TO_SNEW, tb,
|
|
snum[i], sbytes[i], S_new[i]);
|
|
}
|
|
break;
|
|
|
|
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");
|
|
|
|
if (is_direntry_le_ih
|
|
(aux_ih =
|
|
B_N_PITEM_HEAD(tbS0, item_pos))) {
|
|
/* 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 */
|
|
bi.tb = tb;
|
|
bi.bi_bh = S_new[i];
|
|
bi.bi_parent = NULL;
|
|
bi.bi_position = 0;
|
|
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.
|
|
bi_bh,
|
|
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] */
|
|
bi.tb = tb;
|
|
bi.bi_bh = S_new[i];
|
|
bi.bi_parent = NULL;
|
|
bi.bi_position = 0;
|
|
|
|
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 ret_val;
|
|
struct item_head *pasted;
|
|
|
|
#ifdef CONFIG_REISERFS_CHECK
|
|
struct item_head *ih =
|
|
B_N_PITEM_HEAD(tbS0, item_pos);
|
|
|
|
if (!is_direntry_le_ih(ih)
|
|
&& (pos_in_item != ih_item_len(ih)
|
|
|| tb->insert_size[0] <= 0))
|
|
reiserfs_panic(tb->tb_sb,
|
|
"PAP-12235: balance_leaf: pos_in_item must be equal to ih_item_len");
|
|
#endif /* CONFIG_REISERFS_CHECK */
|
|
|
|
ret_val =
|
|
leaf_move_items(LEAF_FROM_S_TO_SNEW,
|
|
tb, snum[i],
|
|
sbytes[i],
|
|
S_new[i]);
|
|
|
|
RFALSE(ret_val,
|
|
"PAP-12240: unexpected value returned by leaf_move_items (%d)",
|
|
ret_val);
|
|
|
|
/* paste into item */
|
|
bi.tb = tb;
|
|
bi.bi_bh = S_new[i];
|
|
bi.bi_parent = NULL;
|
|
bi.bi_position = 0;
|
|
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.bi_bh,
|
|
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] */
|
|
|
|
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: balance_leaf: blknum > 2: unexpectable mode: %s(%d)",
|
|
(flag ==
|
|
M_DELETE) ? "DELETE" : ((flag ==
|
|
M_CUT) ? "CUT"
|
|
: "UNKNOWN"),
|
|
flag);
|
|
}
|
|
|
|
memcpy(insert_key + i, B_N_PKEY(S_new[i], 0), KEY_SIZE);
|
|
insert_ptr[i] = S_new[i];
|
|
|
|
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]);
|
|
}
|
|
|
|
/* 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] */
|
|
|
|
switch (flag) {
|
|
case M_INSERT: /* insert item into S[0] */
|
|
bi.tb = tb;
|
|
bi.bi_bh = tbS0;
|
|
bi.bi_parent = PATH_H_PPARENT(tb->tb_path, 0);
|
|
bi.bi_position = PATH_H_POSITION(tb->tb_path, 1);
|
|
leaf_insert_into_buf(&bi, item_pos, ih, body,
|
|
zeros_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;
|
|
|
|
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 */
|
|
bi.tb = tb;
|
|
bi.bi_bh = tbS0;
|
|
bi.bi_parent =
|
|
PATH_H_PPARENT(tb->tb_path,
|
|
0);
|
|
bi.bi_position =
|
|
PATH_H_POSITION(tb->tb_path,
|
|
1);
|
|
leaf_paste_in_buffer(&bi,
|
|
item_pos,
|
|
pos_in_item,
|
|
tb->
|
|
insert_size
|
|
[0], body,
|
|
zeros_num);
|
|
|
|
/* paste entry */
|
|
leaf_paste_entries(bi.bi_bh,
|
|
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]);
|
|
bi.tb = tb;
|
|
bi.bi_bh = tbS0;
|
|
bi.bi_parent =
|
|
PATH_H_PPARENT(tb->tb_path,
|
|
0);
|
|
bi.bi_position =
|
|
PATH_H_POSITION(tb->tb_path,
|
|
1);
|
|
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;
|
|
}
|
|
#ifdef CONFIG_REISERFS_CHECK
|
|
else {
|
|
if (tb->insert_size[0]) {
|
|
print_cur_tb("12285");
|
|
reiserfs_panic(tb->
|
|
tb_sb,
|
|
"PAP-12285: balance_leaf: insert_size must be 0 (%d)",
|
|
tb->
|
|
insert_size
|
|
[0]);
|
|
}
|
|
}
|
|
#endif /* CONFIG_REISERFS_CHECK */
|
|
|
|
}
|
|
} /* case M_PASTE: */
|
|
}
|
|
}
|
|
#ifdef CONFIG_REISERFS_CHECK
|
|
if (flag == M_PASTE && tb->insert_size[0]) {
|
|
print_cur_tb("12290");
|
|
reiserfs_panic(tb->tb_sb,
|
|
"PAP-12290: balance_leaf: insert_size is still not 0 (%d)",
|
|
tb->insert_size[0]);
|
|
}
|
|
#endif /* CONFIG_REISERFS_CHECK */
|
|
|
|
return 0;
|
|
} /* Leaf level of the tree is balanced (end of balance_leaf) */
|
|
|
|
/* Make empty node */
|
|
void make_empty_node(struct buffer_info *bi)
|
|
{
|
|
struct block_head *blkh;
|
|
|
|
RFALSE(bi->bi_bh == NULL, "PAP-12295: pointer to the buffer is NULL");
|
|
|
|
blkh = B_BLK_HEAD(bi->bi_bh);
|
|
set_blkh_nr_item(blkh, 0);
|
|
set_blkh_free_space(blkh, MAX_CHILD_SIZE(bi->bi_bh));
|
|
|
|
if (bi->bi_parent)
|
|
B_N_CHILD(bi->bi_parent, bi->bi_position)->dc_size = 0; /* Endian safe if 0 */
|
|
}
|
|
|
|
/* Get first empty buffer */
|
|
struct buffer_head *get_FEB(struct tree_balance *tb)
|
|
{
|
|
int i;
|
|
struct buffer_head *first_b;
|
|
struct buffer_info bi;
|
|
|
|
for (i = 0; i < MAX_FEB_SIZE; i++)
|
|
if (tb->FEB[i] != 0)
|
|
break;
|
|
|
|
if (i == MAX_FEB_SIZE)
|
|
reiserfs_panic(tb->tb_sb,
|
|
"vs-12300: get_FEB: FEB list is empty");
|
|
|
|
bi.tb = tb;
|
|
bi.bi_bh = first_b = tb->FEB[i];
|
|
bi.bi_parent = NULL;
|
|
bi.bi_position = 0;
|
|
make_empty_node(&bi);
|
|
set_buffer_uptodate(first_b);
|
|
tb->FEB[i] = NULL;
|
|
tb->used[i] = first_b;
|
|
|
|
return (first_b);
|
|
}
|
|
|
|
/* 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;
|
|
|
|
if (buffer_dirty(bh))
|
|
reiserfs_warning(tb->tb_sb,
|
|
"store_thrown deals with dirty buffer");
|
|
for (i = 0; i < sizeof(tb->thrown) / sizeof(tb->thrown[0]); i++)
|
|
if (!tb->thrown[i]) {
|
|
tb->thrown[i] = bh;
|
|
get_bh(bh); /* free_thrown puts this */
|
|
return;
|
|
}
|
|
reiserfs_warning(tb->tb_sb, "store_thrown: too many thrown buffers");
|
|
}
|
|
|
|
static void free_thrown(struct tree_balance *tb)
|
|
{
|
|
int i;
|
|
b_blocknr_t blocknr;
|
|
for (i = 0; i < sizeof(tb->thrown) / sizeof(tb->thrown[0]); i++) {
|
|
if (tb->thrown[i]) {
|
|
blocknr = tb->thrown[i]->b_blocknr;
|
|
if (buffer_dirty(tb->thrown[i]))
|
|
reiserfs_warning(tb->tb_sb,
|
|
"free_thrown deals with dirty buffer %d",
|
|
blocknr);
|
|
brelse(tb->thrown[i]); /* incremented in store_thrown */
|
|
reiserfs_free_block(tb->transaction_handle, NULL,
|
|
blocknr, 0);
|
|
}
|
|
}
|
|
}
|
|
|
|
void reiserfs_invalidate_buffer(struct tree_balance *tb, struct buffer_head *bh)
|
|
{
|
|
struct block_head *blkh;
|
|
blkh = B_BLK_HEAD(bh);
|
|
set_blkh_level(blkh, FREE_LEVEL);
|
|
set_blkh_nr_item(blkh, 0);
|
|
|
|
clear_buffer_dirty(bh);
|
|
store_thrown(tb, bh);
|
|
}
|
|
|
|
/* Replace n_dest'th key in buffer dest by n_src'th key of buffer src.*/
|
|
void replace_key(struct tree_balance *tb, struct buffer_head *dest, int n_dest,
|
|
struct buffer_head *src, int n_src)
|
|
{
|
|
|
|
RFALSE(dest == NULL || src == NULL,
|
|
"vs-12305: source or destination buffer is 0 (src=%p, dest=%p)",
|
|
src, dest);
|
|
RFALSE(!B_IS_KEYS_LEVEL(dest),
|
|
"vs-12310: invalid level (%z) for destination buffer. dest must be leaf",
|
|
dest);
|
|
RFALSE(n_dest < 0 || n_src < 0,
|
|
"vs-12315: src(%d) or dest(%d) key number < 0", n_src, n_dest);
|
|
RFALSE(n_dest >= B_NR_ITEMS(dest) || n_src >= B_NR_ITEMS(src),
|
|
"vs-12320: src(%d(%d)) or dest(%d(%d)) key number is too big",
|
|
n_src, B_NR_ITEMS(src), n_dest, B_NR_ITEMS(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),
|
|
KEY_SIZE);
|
|
else
|
|
memcpy(B_N_PDELIM_KEY(dest, n_dest), B_N_PDELIM_KEY(src, n_src),
|
|
KEY_SIZE);
|
|
|
|
do_balance_mark_internal_dirty(tb, dest, 0);
|
|
}
|
|
|
|
int get_left_neighbor_position(struct tree_balance *tb, int h)
|
|
{
|
|
int Sh_position = PATH_H_POSITION(tb->tb_path, h + 1);
|
|
|
|
RFALSE(PATH_H_PPARENT(tb->tb_path, h) == 0 || tb->FL[h] == 0,
|
|
"vs-12325: FL[%d](%p) or F[%d](%p) does not exist",
|
|
h, tb->FL[h], h, PATH_H_PPARENT(tb->tb_path, h));
|
|
|
|
if (Sh_position == 0)
|
|
return B_NR_ITEMS(tb->FL[h]);
|
|
else
|
|
return Sh_position - 1;
|
|
}
|
|
|
|
int get_right_neighbor_position(struct tree_balance *tb, int h)
|
|
{
|
|
int Sh_position = PATH_H_POSITION(tb->tb_path, h + 1);
|
|
|
|
RFALSE(PATH_H_PPARENT(tb->tb_path, h) == 0 || tb->FR[h] == 0,
|
|
"vs-12330: F[%d](%p) or FR[%d](%p) does not exist",
|
|
h, PATH_H_PPARENT(tb->tb_path, h), h, tb->FR[h]);
|
|
|
|
if (Sh_position == B_NR_ITEMS(PATH_H_PPARENT(tb->tb_path, h)))
|
|
return 0;
|
|
else
|
|
return Sh_position + 1;
|
|
}
|
|
|
|
#ifdef CONFIG_REISERFS_CHECK
|
|
|
|
int is_reusable(struct super_block *s, b_blocknr_t block, int bit_value);
|
|
static void check_internal_node(struct super_block *s, struct buffer_head *bh,
|
|
char *mes)
|
|
{
|
|
struct disk_child *dc;
|
|
int i;
|
|
|
|
RFALSE(!bh, "PAP-12336: bh == 0");
|
|
|
|
if (!bh || !B_IS_IN_TREE(bh))
|
|
return;
|
|
|
|
RFALSE(!buffer_dirty(bh) &&
|
|
!(buffer_journaled(bh) || buffer_journal_dirty(bh)),
|
|
"PAP-12337: buffer (%b) must be dirty", bh);
|
|
dc = B_N_CHILD(bh, 0);
|
|
|
|
for (i = 0; i <= B_NR_ITEMS(bh); i++, dc++) {
|
|
if (!is_reusable(s, dc_block_number(dc), 1)) {
|
|
print_cur_tb(mes);
|
|
reiserfs_panic(s,
|
|
"PAP-12338: check_internal_node: invalid child pointer %y in %b",
|
|
dc, bh);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int locked_or_not_in_tree(struct buffer_head *bh, char *which)
|
|
{
|
|
if ((!buffer_journal_prepared(bh) && buffer_locked(bh)) ||
|
|
!B_IS_IN_TREE(bh)) {
|
|
reiserfs_warning(NULL,
|
|
"vs-12339: locked_or_not_in_tree: %s (%b)",
|
|
which, bh);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int check_before_balancing(struct tree_balance *tb)
|
|
{
|
|
int retval = 0;
|
|
|
|
if (cur_tb) {
|
|
reiserfs_panic(tb->tb_sb, "vs-12335: check_before_balancing: "
|
|
"suspect that schedule occurred based on cur_tb not being null at this point in code. "
|
|
"do_balance cannot properly handle schedule occurring while it runs.");
|
|
}
|
|
|
|
/* 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->L[0], "L[0]");
|
|
retval |= locked_or_not_in_tree(tb->FL[0], "FL[0]");
|
|
retval |= locked_or_not_in_tree(tb->CFL[0], "CFL[0]");
|
|
check_leaf(tb->L[0]);
|
|
}
|
|
if (tb->rnum[0]) {
|
|
retval |= locked_or_not_in_tree(tb->R[0], "R[0]");
|
|
retval |= locked_or_not_in_tree(tb->FR[0], "FR[0]");
|
|
retval |= locked_or_not_in_tree(tb->CFR[0], "CFR[0]");
|
|
check_leaf(tb->R[0]);
|
|
}
|
|
retval |= locked_or_not_in_tree(PATH_PLAST_BUFFER(tb->tb_path), "S[0]");
|
|
check_leaf(PATH_PLAST_BUFFER(tb->tb_path));
|
|
|
|
return retval;
|
|
}
|
|
|
|
static void check_after_balance_leaf(struct tree_balance *tb)
|
|
{
|
|
if (tb->lnum[0]) {
|
|
if (B_FREE_SPACE(tb->L[0]) !=
|
|
MAX_CHILD_SIZE(tb->L[0]) -
|
|
dc_size(B_N_CHILD
|
|
(tb->FL[0], get_left_neighbor_position(tb, 0)))) {
|
|
print_cur_tb("12221");
|
|
reiserfs_panic(tb->tb_sb,
|
|
"PAP-12355: check_after_balance_leaf: shift to left was incorrect");
|
|
}
|
|
}
|
|
if (tb->rnum[0]) {
|
|
if (B_FREE_SPACE(tb->R[0]) !=
|
|
MAX_CHILD_SIZE(tb->R[0]) -
|
|
dc_size(B_N_CHILD
|
|
(tb->FR[0], get_right_neighbor_position(tb, 0)))) {
|
|
print_cur_tb("12222");
|
|
reiserfs_panic(tb->tb_sb,
|
|
"PAP-12360: check_after_balance_leaf: shift to right was incorrect");
|
|
}
|
|
}
|
|
if (PATH_H_PBUFFER(tb->tb_path, 1) &&
|
|
(B_FREE_SPACE(PATH_H_PBUFFER(tb->tb_path, 0)) !=
|
|
(MAX_CHILD_SIZE(PATH_H_PBUFFER(tb->tb_path, 0)) -
|
|
dc_size(B_N_CHILD(PATH_H_PBUFFER(tb->tb_path, 1),
|
|
PATH_H_POSITION(tb->tb_path, 1)))))) {
|
|
int left = B_FREE_SPACE(PATH_H_PBUFFER(tb->tb_path, 0));
|
|
int right = (MAX_CHILD_SIZE(PATH_H_PBUFFER(tb->tb_path, 0)) -
|
|
dc_size(B_N_CHILD(PATH_H_PBUFFER(tb->tb_path, 1),
|
|
PATH_H_POSITION(tb->tb_path,
|
|
1))));
|
|
print_cur_tb("12223");
|
|
reiserfs_warning(tb->tb_sb,
|
|
"B_FREE_SPACE (PATH_H_PBUFFER(tb->tb_path,0)) = %d; "
|
|
"MAX_CHILD_SIZE (%d) - dc_size( %y, %d ) [%d] = %d",
|
|
left,
|
|
MAX_CHILD_SIZE(PATH_H_PBUFFER(tb->tb_path, 0)),
|
|
PATH_H_PBUFFER(tb->tb_path, 1),
|
|
PATH_H_POSITION(tb->tb_path, 1),
|
|
dc_size(B_N_CHILD
|
|
(PATH_H_PBUFFER(tb->tb_path, 1),
|
|
PATH_H_POSITION(tb->tb_path, 1))),
|
|
right);
|
|
reiserfs_panic(tb->tb_sb,
|
|
"PAP-12365: check_after_balance_leaf: S is incorrect");
|
|
}
|
|
}
|
|
|
|
static void check_leaf_level(struct tree_balance *tb)
|
|
{
|
|
check_leaf(tb->L[0]);
|
|
check_leaf(tb->R[0]);
|
|
check_leaf(PATH_PLAST_BUFFER(tb->tb_path));
|
|
}
|
|
|
|
static void check_internal_levels(struct tree_balance *tb)
|
|
{
|
|
int h;
|
|
|
|
/* check all internal nodes */
|
|
for (h = 1; tb->insert_size[h]; h++) {
|
|
check_internal_node(tb->tb_sb, PATH_H_PBUFFER(tb->tb_path, h),
|
|
"BAD BUFFER ON PATH");
|
|
if (tb->lnum[h])
|
|
check_internal_node(tb->tb_sb, tb->L[h], "BAD L");
|
|
if (tb->rnum[h])
|
|
check_internal_node(tb->tb_sb, tb->R[h], "BAD R");
|
|
}
|
|
|
|
}
|
|
|
|
#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....
|
|
|
|
*/
|
|
|
|
static inline void do_balance_starts(struct tree_balance *tb)
|
|
{
|
|
/* 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");*/
|
|
RFALSE(check_before_balancing(tb), "PAP-12340: locked buffers in TB");
|
|
#ifdef CONFIG_REISERFS_CHECK
|
|
cur_tb = tb;
|
|
#endif
|
|
}
|
|
|
|
static inline void do_balance_completed(struct tree_balance *tb)
|
|
{
|
|
|
|
#ifdef CONFIG_REISERFS_CHECK
|
|
check_leaf_level(tb);
|
|
check_internal_levels(tb);
|
|
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_SB(tb->tb_sb)->s_do_balance++;
|
|
|
|
/* release all nodes hold to perform the balancing */
|
|
unfix_nodes(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 */
|
|
|
|
tb->tb_mode = flag;
|
|
tb->need_balance_dirty = 0;
|
|
|
|
if (FILESYSTEM_CHANGED_TB(tb)) {
|
|
reiserfs_panic(tb->tb_sb,
|
|
"clm-6000: do_balance, fs generation has changed\n");
|
|
}
|
|
/* if we have no real work to do */
|
|
if (!tb->insert_size[0]) {
|
|
reiserfs_warning(tb->tb_sb,
|
|
"PAP-12350: do_balance: insert_size == 0, mode == %c",
|
|
flag);
|
|
unfix_nodes(tb);
|
|
return;
|
|
}
|
|
|
|
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. */
|
|
child_pos = PATH_H_B_ITEM_ORDER(tb->tb_path, 0) +
|
|
balance_leaf(tb, ih, body, flag, insert_key, insert_ptr);
|
|
|
|
#ifdef CONFIG_REISERFS_CHECK
|
|
check_after_balance_leaf(tb);
|
|
#endif
|
|
|
|
/* 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);
|
|
|
|
do_balance_completed(tb);
|
|
|
|
}
|