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![Linus Torvalds](/assets/img/avatar_default.png)
Pull quota, reiserfs, UDF updates from Jan Kara: "Scalability improvements for quota, a few reiserfs fixes, and couple of misc cleanups (udf, ext2)" * 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs: reiserfs: Fix use after free in journal teardown reiserfs: fix corruption introduced by balance_leaf refactor udf: avoid redundant memcpy when writing data in ICB fs/udf: re-use hex_asc_upper_{hi,lo} macros fs/quota: kernel-doc warning fixes udf: use linux/uaccess.h fs/ext2/super.c: Drop memory allocation cast quota: remove dqptr_sem quota: simplify remove_inode_dquot_ref() quota: avoid unnecessary dqget()/dqput() calls quota: protect Q_GETFMT by dqonoff_mutex
1911 lines
54 KiB
C
1911 lines
54 KiB
C
/*
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* Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
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*/
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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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#include <linux/uaccess.h>
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#include <linux/time.h>
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#include "reiserfs.h"
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#include <linux/buffer_head.h>
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#include <linux/kernel.h>
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static inline void buffer_info_init_left(struct tree_balance *tb,
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struct buffer_info *bi)
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{
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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 = get_left_neighbor_position(tb, 0);
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}
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static inline void buffer_info_init_right(struct tree_balance *tb,
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struct buffer_info *bi)
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{
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bi->tb = tb;
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bi->bi_bh = tb->R[0];
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bi->bi_parent = tb->FR[0];
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bi->bi_position = get_right_neighbor_position(tb, 0);
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}
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static inline void buffer_info_init_tbS0(struct tree_balance *tb,
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struct buffer_info *bi)
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{
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bi->tb = tb;
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bi->bi_bh = PATH_PLAST_BUFFER(tb->tb_path);
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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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}
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static inline void buffer_info_init_bh(struct tree_balance *tb,
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struct buffer_info *bi,
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struct buffer_head *bh)
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{
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bi->tb = tb;
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bi->bi_bh = bh;
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bi->bi_parent = NULL;
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bi->bi_position = 0;
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}
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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, 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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/*
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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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*/
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static void balance_leaf_when_delete_del(struct tree_balance *tb)
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{
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struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
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int item_pos = PATH_LAST_POSITION(tb->tb_path);
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struct buffer_info bi;
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#ifdef CONFIG_REISERFS_CHECK
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struct item_head *ih = item_head(tbS0, item_pos);
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#endif
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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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buffer_info_init_tbS0(tb, &bi);
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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, 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, 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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}
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/* cut item in S[0] */
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static void balance_leaf_when_delete_cut(struct tree_balance *tb)
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{
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struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
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int item_pos = PATH_LAST_POSITION(tb->tb_path);
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struct item_head *ih = item_head(tbS0, item_pos);
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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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buffer_info_init_tbS0(tb, &bi);
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if (is_direntry_le_ih(ih)) {
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/*
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* UFS unlink semantics are such that you can only
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* delete one directory entry at a time.
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*
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* when we cut a directory tb->insert_size[0] means
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* number of entries to be cut (always 1)
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*/
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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], tbS0, 0);
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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 "
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"length of item");
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}
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}
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static int balance_leaf_when_delete_left(struct tree_balance *tb)
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{
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struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
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int n = B_NR_ITEMS(tbS0);
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/* L[0] must be joined with S[0] */
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if (tb->lnum[0] == -1) {
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/* R[0] must be also joined with S[0] */
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if (tb->rnum[0] == -1) {
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if (tb->FR[0] == PATH_H_PPARENT(tb->tb_path, 0)) {
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/*
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* all contents of all the
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* 3 buffers will be in L[0]
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*/
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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], tb->FR[0], 1);
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leaf_move_items(LEAF_FROM_S_TO_L, tb, n, -1,
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NULL);
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leaf_move_items(LEAF_FROM_R_TO_L, tb,
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B_NR_ITEMS(tb->R[0]), -1,
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NULL);
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reiserfs_invalidate_buffer(tb, tbS0);
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reiserfs_invalidate_buffer(tb, 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, 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], 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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/*
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* a part of contents of S[0] will be in L[0] and
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* the rest part of S[0] will be in R[0]
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*/
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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 "
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"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) "
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"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) "
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"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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/*
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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
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* 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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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 = item_head(tbS0, item_pos);
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buffer_info_init_tbS0(tb, &bi);
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/* Delete or truncate the item */
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BUG_ON(flag != M_DELETE && flag != M_CUT);
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if (flag == M_DELETE)
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balance_leaf_when_delete_del(tb);
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else /* M_CUT */
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balance_leaf_when_delete_cut(tb);
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/*
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* the rule is that no shifting occurs unless by shifting
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* a node can be freed
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*/
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n = B_NR_ITEMS(tbS0);
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/* L[0] takes part in balancing */
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if (tb->lnum[0])
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return balance_leaf_when_delete_left(tb);
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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 unsigned int balance_leaf_insert_left(struct tree_balance *tb,
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struct item_head *const ih,
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const char * const body)
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{
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int ret;
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struct buffer_info bi;
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int n = B_NR_ITEMS(tb->L[0]);
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unsigned body_shift_bytes = 0;
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if (tb->item_pos == tb->lnum[0] - 1 && tb->lbytes != -1) {
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/* part of new item falls into L[0] */
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int new_item_len, shift;
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int version;
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ret = leaf_shift_left(tb, tb->lnum[0] - 1, -1);
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/* Calculate item length to insert to S[0] */
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new_item_len = 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, ih_item_len(ih) - 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]: "
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"ih_item_len=%d", ih_item_len(ih));
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/* Insert new item into L[0] */
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buffer_info_init_left(tb, &bi);
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leaf_insert_into_buf(&bi, n + tb->item_pos - ret, ih, body,
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min_t(int, tb->zeroes_num, ih_item_len(ih)));
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version = ih_version(ih);
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/*
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* Calculate key component, item length and body to
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* insert into S[0]
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*/
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shift = 0;
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if (is_indirect_le_ih(ih))
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shift = tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT;
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add_le_ih_k_offset(ih, tb->lbytes << shift);
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put_ih_item_len(ih, new_item_len);
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if (tb->lbytes > tb->zeroes_num) {
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body_shift_bytes = tb->lbytes - tb->zeroes_num;
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tb->zeroes_num = 0;
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} else
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tb->zeroes_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]: "
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"ih_item_len=%d", 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 = leaf_shift_left(tb, tb->lnum[0] - 1, tb->lbytes);
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/* Insert new item into L[0] */
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buffer_info_init_left(tb, &bi);
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leaf_insert_into_buf(&bi, n + tb->item_pos - ret, ih, body,
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tb->zeroes_num);
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tb->insert_size[0] = 0;
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tb->zeroes_num = 0;
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}
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return body_shift_bytes;
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}
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static void balance_leaf_paste_left_shift_dirent(struct tree_balance *tb,
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struct item_head * const ih,
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const char * const body)
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{
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int n = B_NR_ITEMS(tb->L[0]);
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struct buffer_info bi;
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RFALSE(tb->zeroes_num,
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"PAP-12090: invalid parameter in case of a directory");
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/* directory item */
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if (tb->lbytes > tb->pos_in_item) {
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/* new directory entry falls into L[0] */
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struct item_head *pasted;
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int ret, l_pos_in_item = tb->pos_in_item;
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/*
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* Shift lnum[0] - 1 items in whole.
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* Shift lbytes - 1 entries from given directory item
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*/
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ret = leaf_shift_left(tb, tb->lnum[0], tb->lbytes - 1);
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if (ret && !tb->item_pos) {
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pasted = item_head(tb->L[0], B_NR_ITEMS(tb->L[0]) - 1);
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l_pos_in_item += ih_entry_count(pasted) -
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(tb->lbytes - 1);
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}
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/* Append given directory entry to directory item */
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buffer_info_init_left(tb, &bi);
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leaf_paste_in_buffer(&bi, n + tb->item_pos - ret,
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l_pos_in_item, tb->insert_size[0],
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body, tb->zeroes_num);
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/*
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* previous string prepared space for pasting new entry,
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* following string pastes this entry
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*/
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/*
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* when we have merge directory item, pos_in_item
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* has been changed too
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*/
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/* paste new directory entry. 1 is entry number */
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leaf_paste_entries(&bi, n + tb->item_pos - ret,
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l_pos_in_item, 1,
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(struct reiserfs_de_head *) body,
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body + DEH_SIZE, tb->insert_size[0]);
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tb->insert_size[0] = 0;
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} else {
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/* new directory item doesn't fall into L[0] */
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/*
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* Shift lnum[0]-1 items in whole. Shift lbytes
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* directory entries from directory item number lnum[0]
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*/
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leaf_shift_left(tb, tb->lnum[0], tb->lbytes);
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}
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/* Calculate new position to append in item body */
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tb->pos_in_item -= tb->lbytes;
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}
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static unsigned int balance_leaf_paste_left_shift(struct tree_balance *tb,
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struct item_head * const ih,
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const char * const body)
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{
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struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
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int n = B_NR_ITEMS(tb->L[0]);
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struct buffer_info bi;
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int body_shift_bytes = 0;
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if (is_direntry_le_ih(item_head(tbS0, tb->item_pos))) {
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balance_leaf_paste_left_shift_dirent(tb, ih, body);
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return 0;
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}
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RFALSE(tb->lbytes <= 0,
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"PAP-12095: there is nothing to shift to L[0]. "
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"lbytes=%d", tb->lbytes);
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RFALSE(tb->pos_in_item != ih_item_len(item_head(tbS0, tb->item_pos)),
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"PAP-12100: incorrect position to paste: "
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"item_len=%d, pos_in_item=%d",
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ih_item_len(item_head(tbS0, tb->item_pos)), tb->pos_in_item);
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/* appended item will be in L[0] in whole */
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if (tb->lbytes >= tb->pos_in_item) {
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struct item_head *tbS0_pos_ih, *tbL0_ih;
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struct item_head *tbS0_0_ih;
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struct reiserfs_key *left_delim_key;
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int ret, l_n, version, temp_l;
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tbS0_pos_ih = item_head(tbS0, tb->item_pos);
|
|
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_shift_bytes = 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);
|
|
}
|
|
return body_shift_bytes;
|
|
}
|
|
|
|
|
|
/* appended item will be in L[0] in whole */
|
|
static void balance_leaf_paste_left_whole(struct tree_balance *tb,
|
|
struct item_head * const ih,
|
|
const char * const 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);
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
|
|
tb->insert_size[0] = 0;
|
|
tb->zeroes_num = 0;
|
|
}
|
|
|
|
static unsigned int balance_leaf_paste_left(struct tree_balance *tb,
|
|
struct item_head * const ih,
|
|
const char * const body)
|
|
{
|
|
/* we must shift the part of the appended item */
|
|
if (tb->item_pos == tb->lnum[0] - 1 && tb->lbytes != -1)
|
|
return balance_leaf_paste_left_shift(tb, ih, body);
|
|
else
|
|
balance_leaf_paste_left_whole(tb, ih, body);
|
|
return 0;
|
|
}
|
|
|
|
/* Shift lnum[0] items from S[0] to the left neighbor L[0] */
|
|
static unsigned int balance_leaf_left(struct tree_balance *tb,
|
|
struct item_head * const ih,
|
|
const char * const body, int flag)
|
|
{
|
|
if (tb->lnum[0] <= 0)
|
|
return 0;
|
|
|
|
/* 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)
|
|
return balance_leaf_insert_left(tb, ih, body);
|
|
else /* M_PASTE */
|
|
return 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);
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void balance_leaf_insert_right(struct tree_balance *tb,
|
|
struct item_head * const ih,
|
|
const char * const 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;
|
|
}
|
|
|
|
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 * const ih,
|
|
const char * const 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);
|
|
}
|
|
}
|
|
|
|
static void balance_leaf_paste_right_shift(struct tree_balance *tb,
|
|
struct item_head * const ih,
|
|
const char * const 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;
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
|
|
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 void balance_leaf_paste_right_whole(struct tree_balance *tb,
|
|
struct item_head * const ih,
|
|
const char * const body)
|
|
{
|
|
struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
|
|
int n = B_NR_ITEMS(tbS0);
|
|
struct item_head *pasted;
|
|
struct buffer_info bi;
|
|
|
|
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);
|
|
}
|
|
|
|
/* 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]);
|
|
|
|
if (!tb->pos_in_item) {
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
if (is_indirect_le_ih(pasted))
|
|
set_ih_free_space(pasted, 0);
|
|
tb->zeroes_num = tb->insert_size[0] = 0;
|
|
}
|
|
|
|
static void balance_leaf_paste_right(struct tree_balance *tb,
|
|
struct item_head * const ih,
|
|
const char * const 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;
|
|
}
|
|
|
|
/* pasted item or part of it falls to R[0] */
|
|
|
|
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);
|
|
}
|
|
|
|
/* 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 * const ih,
|
|
const char * const 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 * const ih,
|
|
const char * const 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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
/* we append to directory item */
|
|
static void balance_leaf_new_nodes_paste_dirent(struct tree_balance *tb,
|
|
struct item_head * const ih,
|
|
const char * const body,
|
|
struct item_head *insert_key,
|
|
struct buffer_head **insert_ptr,
|
|
int i)
|
|
{
|
|
struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
|
|
struct item_head *aux_ih = item_head(tbS0, tb->item_pos);
|
|
int entry_count = ih_entry_count(aux_ih);
|
|
struct buffer_info bi;
|
|
|
|
if (entry_count - tb->sbytes[i] < tb->pos_in_item &&
|
|
tb->pos_in_item <= entry_count) {
|
|
/* new directory entry falls into S_new[i] */
|
|
|
|
RFALSE(!tb->insert_size[0],
|
|
"PAP-12215: insert_size is already 0");
|
|
RFALSE(tb->sbytes[i] - 1 >= entry_count,
|
|
"PAP-12220: there are no so much entries (%d), only %d",
|
|
tb->sbytes[i] - 1, entry_count);
|
|
|
|
/*
|
|
* Shift snum[i]-1 items in whole.
|
|
* Shift sbytes[i] directory entries
|
|
* from directory item number snum[i]
|
|
*/
|
|
leaf_move_items(LEAF_FROM_S_TO_SNEW, tb, tb->snum[i],
|
|
tb->sbytes[i] - 1, tb->S_new[i]);
|
|
|
|
/*
|
|
* Paste given directory entry to
|
|
* directory item
|
|
*/
|
|
buffer_info_init_bh(tb, &bi, tb->S_new[i]);
|
|
leaf_paste_in_buffer(&bi, 0, tb->pos_in_item - entry_count +
|
|
tb->sbytes[i] - 1, tb->insert_size[0],
|
|
body, tb->zeroes_num);
|
|
|
|
/* paste new directory entry */
|
|
leaf_paste_entries(&bi, 0, tb->pos_in_item - entry_count +
|
|
tb->sbytes[i] - 1, 1,
|
|
(struct reiserfs_de_head *) body,
|
|
body + DEH_SIZE, tb->insert_size[0]);
|
|
|
|
tb->insert_size[0] = 0;
|
|
tb->pos_in_item++;
|
|
} else {
|
|
/* new directory entry doesn't fall into S_new[i] */
|
|
leaf_move_items(LEAF_FROM_S_TO_SNEW, tb, tb->snum[i],
|
|
tb->sbytes[i], tb->S_new[i]);
|
|
}
|
|
|
|
}
|
|
|
|
static void balance_leaf_new_nodes_paste_shift(struct tree_balance *tb,
|
|
struct item_head * const ih,
|
|
const char * const 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 * const ih,
|
|
const char * const 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 * const ih,
|
|
const char * const 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 * const ih,
|
|
const char * const 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(!tb->snum[i],
|
|
"PAP-12200: snum[%d] == %d. Must be > 0", i,
|
|
tb->snum[i]);
|
|
|
|
/* here we shift from S to S_new nodes */
|
|
|
|
tb->S_new[i] = get_FEB(tb);
|
|
|
|
/* initialized block type and tree level */
|
|
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]);
|
|
}
|
|
}
|
|
|
|
static void balance_leaf_finish_node_insert(struct tree_balance *tb,
|
|
struct item_head * const ih,
|
|
const char * const 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);
|
|
|
|
/* 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);
|
|
|
|
}
|
|
}
|
|
|
|
static void balance_leaf_finish_node_paste_dirent(struct tree_balance *tb,
|
|
struct item_head * const ih,
|
|
const char * const 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;
|
|
|
|
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);
|
|
}
|
|
|
|
tb->insert_size[0] = 0;
|
|
}
|
|
}
|
|
|
|
static void balance_leaf_finish_node_paste(struct tree_balance *tb,
|
|
struct item_head * const ih,
|
|
const char * const 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);
|
|
|
|
/* when directory, may be new entry already pasted */
|
|
if (is_direntry_le_ih(pasted)) {
|
|
balance_leaf_finish_node_paste_dirent(tb, ih, body);
|
|
return;
|
|
}
|
|
|
|
/* regular object */
|
|
|
|
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 (is_indirect_le_ih(pasted))
|
|
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",
|
|
"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 * const ih,
|
|
const char * const 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;
|
|
|
|
body += 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");
|
|
reiserfs_panic(tb->tb_sb,
|
|
"PAP-12290", "insert_size is still not 0 (%d)",
|
|
tb->insert_size[0]);
|
|
}
|
|
#endif
|
|
|
|
/* Leaf level of the tree is balanced (end of balance_leaf) */
|
|
return 0;
|
|
}
|
|
|
|
/* 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_info bi;
|
|
|
|
for (i = 0; i < MAX_FEB_SIZE; i++)
|
|
if (tb->FEB[i] != NULL)
|
|
break;
|
|
|
|
if (i == MAX_FEB_SIZE)
|
|
reiserfs_panic(tb->tb_sb, "vs-12300", "FEB list is empty");
|
|
|
|
buffer_info_init_bh(tb, &bi, tb->FEB[i]);
|
|
make_empty_node(&bi);
|
|
set_buffer_uptodate(tb->FEB[i]);
|
|
tb->used[i] = tb->FEB[i];
|
|
tb->FEB[i] = NULL;
|
|
|
|
return tb->used[i];
|
|
}
|
|
|
|
/* 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, "reiserfs-12320",
|
|
"called with dirty buffer");
|
|
for (i = 0; i < ARRAY_SIZE(tb->thrown); i++)
|
|
if (!tb->thrown[i]) {
|
|
tb->thrown[i] = bh;
|
|
get_bh(bh); /* free_thrown puts this */
|
|
return;
|
|
}
|
|
reiserfs_warning(tb->tb_sb, "reiserfs-12321",
|
|
"too many thrown buffers");
|
|
}
|
|
|
|
static void free_thrown(struct tree_balance *tb)
|
|
{
|
|
int i;
|
|
b_blocknr_t blocknr;
|
|
for (i = 0; i < ARRAY_SIZE(tb->thrown); i++) {
|
|
if (tb->thrown[i]) {
|
|
blocknr = tb->thrown[i]->b_blocknr;
|
|
if (buffer_dirty(tb->thrown[i]))
|
|
reiserfs_warning(tb->tb_sb, "reiserfs-12322",
|
|
"called 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(internal_key(dest, n_dest), item_head(src, n_src),
|
|
KEY_SIZE);
|
|
else
|
|
memcpy(internal_key(dest, n_dest), internal_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) == NULL || tb->FL[h] == NULL,
|
|
"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) == NULL || tb->FR[h] == NULL,
|
|
"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",
|
|
"invalid child pointer %y in %b",
|
|
dc, bh);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int locked_or_not_in_tree(struct tree_balance *tb,
|
|
struct buffer_head *bh, char *which)
|
|
{
|
|
if ((!buffer_journal_prepared(bh) && buffer_locked(bh)) ||
|
|
!B_IS_IN_TREE(bh)) {
|
|
reiserfs_warning(tb->tb_sb, "vs-12339", "%s (%b)", which, bh);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int check_before_balancing(struct tree_balance *tb)
|
|
{
|
|
int retval = 0;
|
|
|
|
if (REISERFS_SB(tb->tb_sb)->cur_tb) {
|
|
reiserfs_panic(tb->tb_sb, "vs-12335", "suspect that schedule "
|
|
"occurred based on cur_tb not being null at "
|
|
"this point in code. do_balance cannot properly "
|
|
"handle concurrent tree accesses on a same "
|
|
"mount point.");
|
|
}
|
|
|
|
/*
|
|
* 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]");
|
|
retval |= locked_or_not_in_tree(tb, tb->CFL[0], "CFL[0]");
|
|
check_leaf(tb->L[0]);
|
|
}
|
|
if (tb->rnum[0]) {
|
|
retval |= locked_or_not_in_tree(tb, tb->R[0], "R[0]");
|
|
retval |= locked_or_not_in_tree(tb, tb->FR[0], "FR[0]");
|
|
retval |= locked_or_not_in_tree(tb, tb->CFR[0], "CFR[0]");
|
|
check_leaf(tb->R[0]);
|
|
}
|
|
retval |= locked_or_not_in_tree(tb, 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",
|
|
"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",
|
|
"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, "reiserfs-12363",
|
|
"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", "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
|
|
REISERFS_SB(tb->tb_sb)->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);
|
|
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_SB(tb->tb_sb)->s_do_balance++;
|
|
|
|
/* release all nodes hold to perform the balancing */
|
|
unfix_nodes(tb);
|
|
|
|
free_thrown(tb);
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
|
|
if (FILESYSTEM_CHANGED_TB(tb)) {
|
|
reiserfs_panic(tb->tb_sb, "clm-6000", "fs generation has "
|
|
"changed");
|
|
}
|
|
/* if we have no real work to do */
|
|
if (!tb->insert_size[0]) {
|
|
reiserfs_warning(tb->tb_sb, "PAP-12350",
|
|
"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);
|
|
}
|