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1f5abe7e7d
Pekka Enberg advised me: > It would be nice if BUG(), BUG_ON(), and panic() calls would be > converted to proper error handling using WARN_ON() calls. The BUG() > call in nilfs_cpfile_delete_checkpoints(), for example, looks to be > triggerable from user-space via the ioctl() system call. This will follow the comment and keep them to a minimum. Acked-by: Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2270 lines
60 KiB
C
2270 lines
60 KiB
C
/*
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* btree.c - NILFS B-tree.
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*
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* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Written by Koji Sato <koji@osrg.net>.
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*/
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/pagevec.h>
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#include "nilfs.h"
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#include "page.h"
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#include "btnode.h"
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#include "btree.h"
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#include "alloc.h"
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/**
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* struct nilfs_btree_path - A path on which B-tree operations are executed
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* @bp_bh: buffer head of node block
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* @bp_sib_bh: buffer head of sibling node block
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* @bp_index: index of child node
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* @bp_oldreq: ptr end request for old ptr
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* @bp_newreq: ptr alloc request for new ptr
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* @bp_op: rebalance operation
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*/
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struct nilfs_btree_path {
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struct buffer_head *bp_bh;
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struct buffer_head *bp_sib_bh;
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int bp_index;
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union nilfs_bmap_ptr_req bp_oldreq;
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union nilfs_bmap_ptr_req bp_newreq;
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struct nilfs_btnode_chkey_ctxt bp_ctxt;
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void (*bp_op)(struct nilfs_btree *, struct nilfs_btree_path *,
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int, __u64 *, __u64 *);
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};
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/*
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* B-tree path operations
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*/
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static struct kmem_cache *nilfs_btree_path_cache;
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int __init nilfs_btree_path_cache_init(void)
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{
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nilfs_btree_path_cache =
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kmem_cache_create("nilfs2_btree_path_cache",
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sizeof(struct nilfs_btree_path) *
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NILFS_BTREE_LEVEL_MAX, 0, 0, NULL);
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return (nilfs_btree_path_cache != NULL) ? 0 : -ENOMEM;
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}
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void nilfs_btree_path_cache_destroy(void)
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{
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kmem_cache_destroy(nilfs_btree_path_cache);
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}
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static inline struct nilfs_btree_path *
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nilfs_btree_alloc_path(const struct nilfs_btree *btree)
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{
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return (struct nilfs_btree_path *)
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kmem_cache_alloc(nilfs_btree_path_cache, GFP_NOFS);
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}
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static inline void nilfs_btree_free_path(const struct nilfs_btree *btree,
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struct nilfs_btree_path *path)
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{
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kmem_cache_free(nilfs_btree_path_cache, path);
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}
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static void nilfs_btree_init_path(const struct nilfs_btree *btree,
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struct nilfs_btree_path *path)
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{
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int level;
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for (level = NILFS_BTREE_LEVEL_DATA;
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level < NILFS_BTREE_LEVEL_MAX;
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level++) {
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path[level].bp_bh = NULL;
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path[level].bp_sib_bh = NULL;
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path[level].bp_index = 0;
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path[level].bp_oldreq.bpr_ptr = NILFS_BMAP_INVALID_PTR;
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path[level].bp_newreq.bpr_ptr = NILFS_BMAP_INVALID_PTR;
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path[level].bp_op = NULL;
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}
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}
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static void nilfs_btree_clear_path(const struct nilfs_btree *btree,
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struct nilfs_btree_path *path)
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{
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int level;
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for (level = NILFS_BTREE_LEVEL_DATA;
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level < NILFS_BTREE_LEVEL_MAX;
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level++) {
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if (path[level].bp_bh != NULL) {
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nilfs_bmap_put_block(&btree->bt_bmap,
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path[level].bp_bh);
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path[level].bp_bh = NULL;
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}
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/* sib_bh is released or deleted by prepare or commit
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* operations. */
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path[level].bp_sib_bh = NULL;
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path[level].bp_index = 0;
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path[level].bp_oldreq.bpr_ptr = NILFS_BMAP_INVALID_PTR;
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path[level].bp_newreq.bpr_ptr = NILFS_BMAP_INVALID_PTR;
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path[level].bp_op = NULL;
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}
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}
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/*
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* B-tree node operations
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*/
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static inline int
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nilfs_btree_node_get_flags(const struct nilfs_btree *btree,
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const struct nilfs_btree_node *node)
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{
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return node->bn_flags;
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}
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static inline void
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nilfs_btree_node_set_flags(struct nilfs_btree *btree,
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struct nilfs_btree_node *node,
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int flags)
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{
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node->bn_flags = flags;
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}
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static inline int nilfs_btree_node_root(const struct nilfs_btree *btree,
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const struct nilfs_btree_node *node)
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{
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return nilfs_btree_node_get_flags(btree, node) & NILFS_BTREE_NODE_ROOT;
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}
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static inline int
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nilfs_btree_node_get_level(const struct nilfs_btree *btree,
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const struct nilfs_btree_node *node)
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{
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return node->bn_level;
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}
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static inline void
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nilfs_btree_node_set_level(struct nilfs_btree *btree,
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struct nilfs_btree_node *node,
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int level)
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{
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node->bn_level = level;
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}
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static inline int
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nilfs_btree_node_get_nchildren(const struct nilfs_btree *btree,
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const struct nilfs_btree_node *node)
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{
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return le16_to_cpu(node->bn_nchildren);
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}
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static inline void
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nilfs_btree_node_set_nchildren(struct nilfs_btree *btree,
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struct nilfs_btree_node *node,
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int nchildren)
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{
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node->bn_nchildren = cpu_to_le16(nchildren);
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}
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static inline int
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nilfs_btree_node_size(const struct nilfs_btree *btree)
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{
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return 1 << btree->bt_bmap.b_inode->i_blkbits;
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}
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static inline int
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nilfs_btree_node_nchildren_min(const struct nilfs_btree *btree,
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const struct nilfs_btree_node *node)
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{
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return nilfs_btree_node_root(btree, node) ?
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NILFS_BTREE_ROOT_NCHILDREN_MIN :
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NILFS_BTREE_NODE_NCHILDREN_MIN(nilfs_btree_node_size(btree));
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}
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static inline int
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nilfs_btree_node_nchildren_max(const struct nilfs_btree *btree,
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const struct nilfs_btree_node *node)
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{
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return nilfs_btree_node_root(btree, node) ?
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NILFS_BTREE_ROOT_NCHILDREN_MAX :
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NILFS_BTREE_NODE_NCHILDREN_MAX(nilfs_btree_node_size(btree));
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}
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static inline __le64 *
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nilfs_btree_node_dkeys(const struct nilfs_btree *btree,
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const struct nilfs_btree_node *node)
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{
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return (__le64 *)((char *)(node + 1) +
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(nilfs_btree_node_root(btree, node) ?
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0 : NILFS_BTREE_NODE_EXTRA_PAD_SIZE));
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}
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static inline __le64 *
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nilfs_btree_node_dptrs(const struct nilfs_btree *btree,
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const struct nilfs_btree_node *node)
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{
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return (__le64 *)(nilfs_btree_node_dkeys(btree, node) +
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nilfs_btree_node_nchildren_max(btree, node));
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}
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static inline __u64
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nilfs_btree_node_get_key(const struct nilfs_btree *btree,
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const struct nilfs_btree_node *node, int index)
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{
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return nilfs_bmap_dkey_to_key(*(nilfs_btree_node_dkeys(btree, node) +
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index));
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}
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static inline void
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nilfs_btree_node_set_key(struct nilfs_btree *btree,
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struct nilfs_btree_node *node, int index, __u64 key)
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{
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*(nilfs_btree_node_dkeys(btree, node) + index) =
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nilfs_bmap_key_to_dkey(key);
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}
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static inline __u64
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nilfs_btree_node_get_ptr(const struct nilfs_btree *btree,
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const struct nilfs_btree_node *node,
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int index)
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{
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return nilfs_bmap_dptr_to_ptr(*(nilfs_btree_node_dptrs(btree, node) +
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index));
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}
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static inline void
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nilfs_btree_node_set_ptr(struct nilfs_btree *btree,
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struct nilfs_btree_node *node,
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int index,
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__u64 ptr)
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{
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*(nilfs_btree_node_dptrs(btree, node) + index) =
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nilfs_bmap_ptr_to_dptr(ptr);
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}
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static void nilfs_btree_node_init(struct nilfs_btree *btree,
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struct nilfs_btree_node *node,
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int flags, int level, int nchildren,
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const __u64 *keys, const __u64 *ptrs)
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{
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__le64 *dkeys;
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__le64 *dptrs;
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int i;
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nilfs_btree_node_set_flags(btree, node, flags);
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nilfs_btree_node_set_level(btree, node, level);
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nilfs_btree_node_set_nchildren(btree, node, nchildren);
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dkeys = nilfs_btree_node_dkeys(btree, node);
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dptrs = nilfs_btree_node_dptrs(btree, node);
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for (i = 0; i < nchildren; i++) {
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dkeys[i] = nilfs_bmap_key_to_dkey(keys[i]);
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dptrs[i] = nilfs_bmap_ptr_to_dptr(ptrs[i]);
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}
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}
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/* Assume the buffer heads corresponding to left and right are locked. */
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static void nilfs_btree_node_move_left(struct nilfs_btree *btree,
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struct nilfs_btree_node *left,
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struct nilfs_btree_node *right,
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int n)
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{
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__le64 *ldkeys, *rdkeys;
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__le64 *ldptrs, *rdptrs;
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int lnchildren, rnchildren;
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ldkeys = nilfs_btree_node_dkeys(btree, left);
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ldptrs = nilfs_btree_node_dptrs(btree, left);
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lnchildren = nilfs_btree_node_get_nchildren(btree, left);
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rdkeys = nilfs_btree_node_dkeys(btree, right);
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rdptrs = nilfs_btree_node_dptrs(btree, right);
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rnchildren = nilfs_btree_node_get_nchildren(btree, right);
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memcpy(ldkeys + lnchildren, rdkeys, n * sizeof(*rdkeys));
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memcpy(ldptrs + lnchildren, rdptrs, n * sizeof(*rdptrs));
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memmove(rdkeys, rdkeys + n, (rnchildren - n) * sizeof(*rdkeys));
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memmove(rdptrs, rdptrs + n, (rnchildren - n) * sizeof(*rdptrs));
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lnchildren += n;
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rnchildren -= n;
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nilfs_btree_node_set_nchildren(btree, left, lnchildren);
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nilfs_btree_node_set_nchildren(btree, right, rnchildren);
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}
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/* Assume that the buffer heads corresponding to left and right are locked. */
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static void nilfs_btree_node_move_right(struct nilfs_btree *btree,
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struct nilfs_btree_node *left,
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struct nilfs_btree_node *right,
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int n)
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{
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__le64 *ldkeys, *rdkeys;
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__le64 *ldptrs, *rdptrs;
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int lnchildren, rnchildren;
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ldkeys = nilfs_btree_node_dkeys(btree, left);
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ldptrs = nilfs_btree_node_dptrs(btree, left);
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lnchildren = nilfs_btree_node_get_nchildren(btree, left);
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rdkeys = nilfs_btree_node_dkeys(btree, right);
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rdptrs = nilfs_btree_node_dptrs(btree, right);
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rnchildren = nilfs_btree_node_get_nchildren(btree, right);
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memmove(rdkeys + n, rdkeys, rnchildren * sizeof(*rdkeys));
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memmove(rdptrs + n, rdptrs, rnchildren * sizeof(*rdptrs));
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memcpy(rdkeys, ldkeys + lnchildren - n, n * sizeof(*rdkeys));
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memcpy(rdptrs, ldptrs + lnchildren - n, n * sizeof(*rdptrs));
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lnchildren -= n;
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rnchildren += n;
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nilfs_btree_node_set_nchildren(btree, left, lnchildren);
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nilfs_btree_node_set_nchildren(btree, right, rnchildren);
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}
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/* Assume that the buffer head corresponding to node is locked. */
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static void nilfs_btree_node_insert(struct nilfs_btree *btree,
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struct nilfs_btree_node *node,
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__u64 key, __u64 ptr, int index)
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{
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__le64 *dkeys;
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__le64 *dptrs;
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int nchildren;
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dkeys = nilfs_btree_node_dkeys(btree, node);
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dptrs = nilfs_btree_node_dptrs(btree, node);
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nchildren = nilfs_btree_node_get_nchildren(btree, node);
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if (index < nchildren) {
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memmove(dkeys + index + 1, dkeys + index,
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(nchildren - index) * sizeof(*dkeys));
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memmove(dptrs + index + 1, dptrs + index,
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(nchildren - index) * sizeof(*dptrs));
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}
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dkeys[index] = nilfs_bmap_key_to_dkey(key);
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dptrs[index] = nilfs_bmap_ptr_to_dptr(ptr);
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nchildren++;
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nilfs_btree_node_set_nchildren(btree, node, nchildren);
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}
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/* Assume that the buffer head corresponding to node is locked. */
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static void nilfs_btree_node_delete(struct nilfs_btree *btree,
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struct nilfs_btree_node *node,
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__u64 *keyp, __u64 *ptrp, int index)
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{
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__u64 key;
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__u64 ptr;
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__le64 *dkeys;
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__le64 *dptrs;
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int nchildren;
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dkeys = nilfs_btree_node_dkeys(btree, node);
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dptrs = nilfs_btree_node_dptrs(btree, node);
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key = nilfs_bmap_dkey_to_key(dkeys[index]);
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ptr = nilfs_bmap_dptr_to_ptr(dptrs[index]);
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nchildren = nilfs_btree_node_get_nchildren(btree, node);
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if (keyp != NULL)
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*keyp = key;
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if (ptrp != NULL)
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*ptrp = ptr;
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|
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if (index < nchildren - 1) {
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memmove(dkeys + index, dkeys + index + 1,
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(nchildren - index - 1) * sizeof(*dkeys));
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memmove(dptrs + index, dptrs + index + 1,
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(nchildren - index - 1) * sizeof(*dptrs));
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}
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nchildren--;
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nilfs_btree_node_set_nchildren(btree, node, nchildren);
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}
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|
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static int nilfs_btree_node_lookup(const struct nilfs_btree *btree,
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const struct nilfs_btree_node *node,
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__u64 key, int *indexp)
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{
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__u64 nkey;
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int index, low, high, s;
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|
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/* binary search */
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low = 0;
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high = nilfs_btree_node_get_nchildren(btree, node) - 1;
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index = 0;
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s = 0;
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while (low <= high) {
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index = (low + high) / 2;
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nkey = nilfs_btree_node_get_key(btree, node, index);
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if (nkey == key) {
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s = 0;
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goto out;
|
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} else if (nkey < key) {
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low = index + 1;
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s = -1;
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} else {
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high = index - 1;
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s = 1;
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}
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}
|
|
|
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/* adjust index */
|
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if (nilfs_btree_node_get_level(btree, node) >
|
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NILFS_BTREE_LEVEL_NODE_MIN) {
|
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if ((s > 0) && (index > 0))
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index--;
|
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} else if (s < 0)
|
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index++;
|
|
|
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out:
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*indexp = index;
|
|
|
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return s == 0;
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}
|
|
|
|
static inline struct nilfs_btree_node *
|
|
nilfs_btree_get_root(const struct nilfs_btree *btree)
|
|
{
|
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return (struct nilfs_btree_node *)btree->bt_bmap.b_u.u_data;
|
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}
|
|
|
|
static inline struct nilfs_btree_node *
|
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nilfs_btree_get_nonroot_node(const struct nilfs_btree *btree,
|
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const struct nilfs_btree_path *path,
|
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int level)
|
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{
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return (struct nilfs_btree_node *)path[level].bp_bh->b_data;
|
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}
|
|
|
|
static inline struct nilfs_btree_node *
|
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nilfs_btree_get_sib_node(const struct nilfs_btree *btree,
|
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const struct nilfs_btree_path *path,
|
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int level)
|
|
{
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return (struct nilfs_btree_node *)path[level].bp_sib_bh->b_data;
|
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}
|
|
|
|
static inline int nilfs_btree_height(const struct nilfs_btree *btree)
|
|
{
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return nilfs_btree_node_get_level(btree, nilfs_btree_get_root(btree))
|
|
+ 1;
|
|
}
|
|
|
|
static inline struct nilfs_btree_node *
|
|
nilfs_btree_get_node(const struct nilfs_btree *btree,
|
|
const struct nilfs_btree_path *path,
|
|
int level)
|
|
{
|
|
return (level == nilfs_btree_height(btree) - 1) ?
|
|
nilfs_btree_get_root(btree) :
|
|
nilfs_btree_get_nonroot_node(btree, path, level);
|
|
}
|
|
|
|
static int nilfs_btree_do_lookup(const struct nilfs_btree *btree,
|
|
struct nilfs_btree_path *path,
|
|
__u64 key, __u64 *ptrp, int minlevel)
|
|
{
|
|
struct nilfs_btree_node *node;
|
|
__u64 ptr;
|
|
int level, index, found, ret;
|
|
|
|
node = nilfs_btree_get_root(btree);
|
|
level = nilfs_btree_node_get_level(btree, node);
|
|
if ((level < minlevel) ||
|
|
(nilfs_btree_node_get_nchildren(btree, node) <= 0))
|
|
return -ENOENT;
|
|
|
|
found = nilfs_btree_node_lookup(btree, node, key, &index);
|
|
ptr = nilfs_btree_node_get_ptr(btree, node, index);
|
|
path[level].bp_bh = NULL;
|
|
path[level].bp_index = index;
|
|
|
|
for (level--; level >= minlevel; level--) {
|
|
ret = nilfs_bmap_get_block(&btree->bt_bmap, ptr,
|
|
&path[level].bp_bh);
|
|
if (ret < 0)
|
|
return ret;
|
|
node = nilfs_btree_get_nonroot_node(btree, path, level);
|
|
BUG_ON(level != nilfs_btree_node_get_level(btree, node));
|
|
if (!found)
|
|
found = nilfs_btree_node_lookup(btree, node, key,
|
|
&index);
|
|
else
|
|
index = 0;
|
|
if (index < nilfs_btree_node_nchildren_max(btree, node))
|
|
ptr = nilfs_btree_node_get_ptr(btree, node, index);
|
|
else {
|
|
WARN_ON(found || level != NILFS_BTREE_LEVEL_NODE_MIN);
|
|
/* insert */
|
|
ptr = NILFS_BMAP_INVALID_PTR;
|
|
}
|
|
path[level].bp_index = index;
|
|
}
|
|
if (!found)
|
|
return -ENOENT;
|
|
|
|
if (ptrp != NULL)
|
|
*ptrp = ptr;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nilfs_btree_do_lookup_last(const struct nilfs_btree *btree,
|
|
struct nilfs_btree_path *path,
|
|
__u64 *keyp, __u64 *ptrp)
|
|
{
|
|
struct nilfs_btree_node *node;
|
|
__u64 ptr;
|
|
int index, level, ret;
|
|
|
|
node = nilfs_btree_get_root(btree);
|
|
index = nilfs_btree_node_get_nchildren(btree, node) - 1;
|
|
if (index < 0)
|
|
return -ENOENT;
|
|
level = nilfs_btree_node_get_level(btree, node);
|
|
ptr = nilfs_btree_node_get_ptr(btree, node, index);
|
|
path[level].bp_bh = NULL;
|
|
path[level].bp_index = index;
|
|
|
|
for (level--; level > 0; level--) {
|
|
ret = nilfs_bmap_get_block(&btree->bt_bmap, ptr,
|
|
&path[level].bp_bh);
|
|
if (ret < 0)
|
|
return ret;
|
|
node = nilfs_btree_get_nonroot_node(btree, path, level);
|
|
BUG_ON(level != nilfs_btree_node_get_level(btree, node));
|
|
index = nilfs_btree_node_get_nchildren(btree, node) - 1;
|
|
ptr = nilfs_btree_node_get_ptr(btree, node, index);
|
|
path[level].bp_index = index;
|
|
}
|
|
|
|
if (keyp != NULL)
|
|
*keyp = nilfs_btree_node_get_key(btree, node, index);
|
|
if (ptrp != NULL)
|
|
*ptrp = ptr;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nilfs_btree_lookup(const struct nilfs_bmap *bmap,
|
|
__u64 key, int level, __u64 *ptrp)
|
|
{
|
|
struct nilfs_btree *btree;
|
|
struct nilfs_btree_path *path;
|
|
__u64 ptr;
|
|
int ret;
|
|
|
|
btree = (struct nilfs_btree *)bmap;
|
|
path = nilfs_btree_alloc_path(btree);
|
|
if (path == NULL)
|
|
return -ENOMEM;
|
|
nilfs_btree_init_path(btree, path);
|
|
|
|
ret = nilfs_btree_do_lookup(btree, path, key, &ptr, level);
|
|
|
|
if (ptrp != NULL)
|
|
*ptrp = ptr;
|
|
|
|
nilfs_btree_clear_path(btree, path);
|
|
nilfs_btree_free_path(btree, path);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void nilfs_btree_promote_key(struct nilfs_btree *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level, __u64 key)
|
|
{
|
|
if (level < nilfs_btree_height(btree) - 1) {
|
|
do {
|
|
lock_buffer(path[level].bp_bh);
|
|
nilfs_btree_node_set_key(
|
|
btree,
|
|
nilfs_btree_get_nonroot_node(
|
|
btree, path, level),
|
|
path[level].bp_index, key);
|
|
if (!buffer_dirty(path[level].bp_bh))
|
|
nilfs_btnode_mark_dirty(path[level].bp_bh);
|
|
unlock_buffer(path[level].bp_bh);
|
|
} while ((path[level].bp_index == 0) &&
|
|
(++level < nilfs_btree_height(btree) - 1));
|
|
}
|
|
|
|
/* root */
|
|
if (level == nilfs_btree_height(btree) - 1) {
|
|
nilfs_btree_node_set_key(btree,
|
|
nilfs_btree_get_root(btree),
|
|
path[level].bp_index, key);
|
|
}
|
|
}
|
|
|
|
static void nilfs_btree_do_insert(struct nilfs_btree *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level, __u64 *keyp, __u64 *ptrp)
|
|
{
|
|
struct nilfs_btree_node *node;
|
|
|
|
if (level < nilfs_btree_height(btree) - 1) {
|
|
lock_buffer(path[level].bp_bh);
|
|
node = nilfs_btree_get_nonroot_node(btree, path, level);
|
|
nilfs_btree_node_insert(btree, node, *keyp, *ptrp,
|
|
path[level].bp_index);
|
|
if (!buffer_dirty(path[level].bp_bh))
|
|
nilfs_btnode_mark_dirty(path[level].bp_bh);
|
|
unlock_buffer(path[level].bp_bh);
|
|
|
|
if (path[level].bp_index == 0)
|
|
nilfs_btree_promote_key(btree, path, level + 1,
|
|
nilfs_btree_node_get_key(
|
|
btree, node, 0));
|
|
} else {
|
|
node = nilfs_btree_get_root(btree);
|
|
nilfs_btree_node_insert(btree, node, *keyp, *ptrp,
|
|
path[level].bp_index);
|
|
}
|
|
}
|
|
|
|
static void nilfs_btree_carry_left(struct nilfs_btree *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level, __u64 *keyp, __u64 *ptrp)
|
|
{
|
|
struct nilfs_btree_node *node, *left;
|
|
int nchildren, lnchildren, n, move;
|
|
|
|
lock_buffer(path[level].bp_bh);
|
|
lock_buffer(path[level].bp_sib_bh);
|
|
|
|
node = nilfs_btree_get_nonroot_node(btree, path, level);
|
|
left = nilfs_btree_get_sib_node(btree, path, level);
|
|
nchildren = nilfs_btree_node_get_nchildren(btree, node);
|
|
lnchildren = nilfs_btree_node_get_nchildren(btree, left);
|
|
move = 0;
|
|
|
|
n = (nchildren + lnchildren + 1) / 2 - lnchildren;
|
|
if (n > path[level].bp_index) {
|
|
/* move insert point */
|
|
n--;
|
|
move = 1;
|
|
}
|
|
|
|
nilfs_btree_node_move_left(btree, left, node, n);
|
|
|
|
if (!buffer_dirty(path[level].bp_bh))
|
|
nilfs_btnode_mark_dirty(path[level].bp_bh);
|
|
if (!buffer_dirty(path[level].bp_sib_bh))
|
|
nilfs_btnode_mark_dirty(path[level].bp_sib_bh);
|
|
|
|
unlock_buffer(path[level].bp_bh);
|
|
unlock_buffer(path[level].bp_sib_bh);
|
|
|
|
nilfs_btree_promote_key(btree, path, level + 1,
|
|
nilfs_btree_node_get_key(btree, node, 0));
|
|
|
|
if (move) {
|
|
nilfs_bmap_put_block(&btree->bt_bmap, path[level].bp_bh);
|
|
path[level].bp_bh = path[level].bp_sib_bh;
|
|
path[level].bp_sib_bh = NULL;
|
|
path[level].bp_index += lnchildren;
|
|
path[level + 1].bp_index--;
|
|
} else {
|
|
nilfs_bmap_put_block(&btree->bt_bmap, path[level].bp_sib_bh);
|
|
path[level].bp_sib_bh = NULL;
|
|
path[level].bp_index -= n;
|
|
}
|
|
|
|
nilfs_btree_do_insert(btree, path, level, keyp, ptrp);
|
|
}
|
|
|
|
static void nilfs_btree_carry_right(struct nilfs_btree *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level, __u64 *keyp, __u64 *ptrp)
|
|
{
|
|
struct nilfs_btree_node *node, *right;
|
|
int nchildren, rnchildren, n, move;
|
|
|
|
lock_buffer(path[level].bp_bh);
|
|
lock_buffer(path[level].bp_sib_bh);
|
|
|
|
node = nilfs_btree_get_nonroot_node(btree, path, level);
|
|
right = nilfs_btree_get_sib_node(btree, path, level);
|
|
nchildren = nilfs_btree_node_get_nchildren(btree, node);
|
|
rnchildren = nilfs_btree_node_get_nchildren(btree, right);
|
|
move = 0;
|
|
|
|
n = (nchildren + rnchildren + 1) / 2 - rnchildren;
|
|
if (n > nchildren - path[level].bp_index) {
|
|
/* move insert point */
|
|
n--;
|
|
move = 1;
|
|
}
|
|
|
|
nilfs_btree_node_move_right(btree, node, right, n);
|
|
|
|
if (!buffer_dirty(path[level].bp_bh))
|
|
nilfs_btnode_mark_dirty(path[level].bp_bh);
|
|
if (!buffer_dirty(path[level].bp_sib_bh))
|
|
nilfs_btnode_mark_dirty(path[level].bp_sib_bh);
|
|
|
|
unlock_buffer(path[level].bp_bh);
|
|
unlock_buffer(path[level].bp_sib_bh);
|
|
|
|
path[level + 1].bp_index++;
|
|
nilfs_btree_promote_key(btree, path, level + 1,
|
|
nilfs_btree_node_get_key(btree, right, 0));
|
|
path[level + 1].bp_index--;
|
|
|
|
if (move) {
|
|
nilfs_bmap_put_block(&btree->bt_bmap, path[level].bp_bh);
|
|
path[level].bp_bh = path[level].bp_sib_bh;
|
|
path[level].bp_sib_bh = NULL;
|
|
path[level].bp_index -=
|
|
nilfs_btree_node_get_nchildren(btree, node);
|
|
path[level + 1].bp_index++;
|
|
} else {
|
|
nilfs_bmap_put_block(&btree->bt_bmap, path[level].bp_sib_bh);
|
|
path[level].bp_sib_bh = NULL;
|
|
}
|
|
|
|
nilfs_btree_do_insert(btree, path, level, keyp, ptrp);
|
|
}
|
|
|
|
static void nilfs_btree_split(struct nilfs_btree *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level, __u64 *keyp, __u64 *ptrp)
|
|
{
|
|
struct nilfs_btree_node *node, *right;
|
|
__u64 newkey;
|
|
__u64 newptr;
|
|
int nchildren, n, move;
|
|
|
|
lock_buffer(path[level].bp_bh);
|
|
lock_buffer(path[level].bp_sib_bh);
|
|
|
|
node = nilfs_btree_get_nonroot_node(btree, path, level);
|
|
right = nilfs_btree_get_sib_node(btree, path, level);
|
|
nchildren = nilfs_btree_node_get_nchildren(btree, node);
|
|
move = 0;
|
|
|
|
n = (nchildren + 1) / 2;
|
|
if (n > nchildren - path[level].bp_index) {
|
|
n--;
|
|
move = 1;
|
|
}
|
|
|
|
nilfs_btree_node_move_right(btree, node, right, n);
|
|
|
|
if (!buffer_dirty(path[level].bp_bh))
|
|
nilfs_btnode_mark_dirty(path[level].bp_bh);
|
|
if (!buffer_dirty(path[level].bp_sib_bh))
|
|
nilfs_btnode_mark_dirty(path[level].bp_sib_bh);
|
|
|
|
unlock_buffer(path[level].bp_bh);
|
|
unlock_buffer(path[level].bp_sib_bh);
|
|
|
|
newkey = nilfs_btree_node_get_key(btree, right, 0);
|
|
newptr = path[level].bp_newreq.bpr_ptr;
|
|
|
|
if (move) {
|
|
path[level].bp_index -=
|
|
nilfs_btree_node_get_nchildren(btree, node);
|
|
nilfs_btree_node_insert(btree, right, *keyp, *ptrp,
|
|
path[level].bp_index);
|
|
|
|
*keyp = nilfs_btree_node_get_key(btree, right, 0);
|
|
*ptrp = path[level].bp_newreq.bpr_ptr;
|
|
|
|
nilfs_bmap_put_block(&btree->bt_bmap, path[level].bp_bh);
|
|
path[level].bp_bh = path[level].bp_sib_bh;
|
|
path[level].bp_sib_bh = NULL;
|
|
} else {
|
|
nilfs_btree_do_insert(btree, path, level, keyp, ptrp);
|
|
|
|
*keyp = nilfs_btree_node_get_key(btree, right, 0);
|
|
*ptrp = path[level].bp_newreq.bpr_ptr;
|
|
|
|
nilfs_bmap_put_block(&btree->bt_bmap, path[level].bp_sib_bh);
|
|
path[level].bp_sib_bh = NULL;
|
|
}
|
|
|
|
path[level + 1].bp_index++;
|
|
}
|
|
|
|
static void nilfs_btree_grow(struct nilfs_btree *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level, __u64 *keyp, __u64 *ptrp)
|
|
{
|
|
struct nilfs_btree_node *root, *child;
|
|
int n;
|
|
|
|
lock_buffer(path[level].bp_sib_bh);
|
|
|
|
root = nilfs_btree_get_root(btree);
|
|
child = nilfs_btree_get_sib_node(btree, path, level);
|
|
|
|
n = nilfs_btree_node_get_nchildren(btree, root);
|
|
|
|
nilfs_btree_node_move_right(btree, root, child, n);
|
|
nilfs_btree_node_set_level(btree, root, level + 1);
|
|
|
|
if (!buffer_dirty(path[level].bp_sib_bh))
|
|
nilfs_btnode_mark_dirty(path[level].bp_sib_bh);
|
|
|
|
unlock_buffer(path[level].bp_sib_bh);
|
|
|
|
path[level].bp_bh = path[level].bp_sib_bh;
|
|
path[level].bp_sib_bh = NULL;
|
|
|
|
nilfs_btree_do_insert(btree, path, level, keyp, ptrp);
|
|
|
|
*keyp = nilfs_btree_node_get_key(btree, child, 0);
|
|
*ptrp = path[level].bp_newreq.bpr_ptr;
|
|
}
|
|
|
|
static __u64 nilfs_btree_find_near(const struct nilfs_btree *btree,
|
|
const struct nilfs_btree_path *path)
|
|
{
|
|
struct nilfs_btree_node *node;
|
|
int level;
|
|
|
|
if (path == NULL)
|
|
return NILFS_BMAP_INVALID_PTR;
|
|
|
|
/* left sibling */
|
|
level = NILFS_BTREE_LEVEL_NODE_MIN;
|
|
if (path[level].bp_index > 0) {
|
|
node = nilfs_btree_get_node(btree, path, level);
|
|
return nilfs_btree_node_get_ptr(btree, node,
|
|
path[level].bp_index - 1);
|
|
}
|
|
|
|
/* parent */
|
|
level = NILFS_BTREE_LEVEL_NODE_MIN + 1;
|
|
if (level <= nilfs_btree_height(btree) - 1) {
|
|
node = nilfs_btree_get_node(btree, path, level);
|
|
return nilfs_btree_node_get_ptr(btree, node,
|
|
path[level].bp_index);
|
|
}
|
|
|
|
return NILFS_BMAP_INVALID_PTR;
|
|
}
|
|
|
|
static __u64 nilfs_btree_find_target_v(const struct nilfs_btree *btree,
|
|
const struct nilfs_btree_path *path,
|
|
__u64 key)
|
|
{
|
|
__u64 ptr;
|
|
|
|
ptr = nilfs_bmap_find_target_seq(&btree->bt_bmap, key);
|
|
if (ptr != NILFS_BMAP_INVALID_PTR)
|
|
/* sequential access */
|
|
return ptr;
|
|
else {
|
|
ptr = nilfs_btree_find_near(btree, path);
|
|
if (ptr != NILFS_BMAP_INVALID_PTR)
|
|
/* near */
|
|
return ptr;
|
|
}
|
|
/* block group */
|
|
return nilfs_bmap_find_target_in_group(&btree->bt_bmap);
|
|
}
|
|
|
|
static void nilfs_btree_set_target_v(struct nilfs_btree *btree, __u64 key,
|
|
__u64 ptr)
|
|
{
|
|
btree->bt_bmap.b_last_allocated_key = key;
|
|
btree->bt_bmap.b_last_allocated_ptr = ptr;
|
|
}
|
|
|
|
static int nilfs_btree_prepare_insert(struct nilfs_btree *btree,
|
|
struct nilfs_btree_path *path,
|
|
int *levelp, __u64 key, __u64 ptr,
|
|
struct nilfs_bmap_stats *stats)
|
|
{
|
|
struct buffer_head *bh;
|
|
struct nilfs_btree_node *node, *parent, *sib;
|
|
__u64 sibptr;
|
|
int pindex, level, ret;
|
|
|
|
stats->bs_nblocks = 0;
|
|
level = NILFS_BTREE_LEVEL_DATA;
|
|
|
|
/* allocate a new ptr for data block */
|
|
if (btree->bt_ops->btop_find_target != NULL)
|
|
path[level].bp_newreq.bpr_ptr =
|
|
btree->bt_ops->btop_find_target(btree, path, key);
|
|
|
|
ret = btree->bt_bmap.b_pops->bpop_prepare_alloc_ptr(
|
|
&btree->bt_bmap, &path[level].bp_newreq);
|
|
if (ret < 0)
|
|
goto err_out_data;
|
|
|
|
for (level = NILFS_BTREE_LEVEL_NODE_MIN;
|
|
level < nilfs_btree_height(btree) - 1;
|
|
level++) {
|
|
node = nilfs_btree_get_nonroot_node(btree, path, level);
|
|
if (nilfs_btree_node_get_nchildren(btree, node) <
|
|
nilfs_btree_node_nchildren_max(btree, node)) {
|
|
path[level].bp_op = nilfs_btree_do_insert;
|
|
stats->bs_nblocks++;
|
|
goto out;
|
|
}
|
|
|
|
parent = nilfs_btree_get_node(btree, path, level + 1);
|
|
pindex = path[level + 1].bp_index;
|
|
|
|
/* left sibling */
|
|
if (pindex > 0) {
|
|
sibptr = nilfs_btree_node_get_ptr(btree, parent,
|
|
pindex - 1);
|
|
ret = nilfs_bmap_get_block(&btree->bt_bmap, sibptr,
|
|
&bh);
|
|
if (ret < 0)
|
|
goto err_out_child_node;
|
|
sib = (struct nilfs_btree_node *)bh->b_data;
|
|
if (nilfs_btree_node_get_nchildren(btree, sib) <
|
|
nilfs_btree_node_nchildren_max(btree, sib)) {
|
|
path[level].bp_sib_bh = bh;
|
|
path[level].bp_op = nilfs_btree_carry_left;
|
|
stats->bs_nblocks++;
|
|
goto out;
|
|
} else
|
|
nilfs_bmap_put_block(&btree->bt_bmap, bh);
|
|
}
|
|
|
|
/* right sibling */
|
|
if (pindex <
|
|
nilfs_btree_node_get_nchildren(btree, parent) - 1) {
|
|
sibptr = nilfs_btree_node_get_ptr(btree, parent,
|
|
pindex + 1);
|
|
ret = nilfs_bmap_get_block(&btree->bt_bmap, sibptr,
|
|
&bh);
|
|
if (ret < 0)
|
|
goto err_out_child_node;
|
|
sib = (struct nilfs_btree_node *)bh->b_data;
|
|
if (nilfs_btree_node_get_nchildren(btree, sib) <
|
|
nilfs_btree_node_nchildren_max(btree, sib)) {
|
|
path[level].bp_sib_bh = bh;
|
|
path[level].bp_op = nilfs_btree_carry_right;
|
|
stats->bs_nblocks++;
|
|
goto out;
|
|
} else
|
|
nilfs_bmap_put_block(&btree->bt_bmap, bh);
|
|
}
|
|
|
|
/* split */
|
|
path[level].bp_newreq.bpr_ptr =
|
|
path[level - 1].bp_newreq.bpr_ptr + 1;
|
|
ret = btree->bt_bmap.b_pops->bpop_prepare_alloc_ptr(
|
|
&btree->bt_bmap, &path[level].bp_newreq);
|
|
if (ret < 0)
|
|
goto err_out_child_node;
|
|
ret = nilfs_bmap_get_new_block(&btree->bt_bmap,
|
|
path[level].bp_newreq.bpr_ptr,
|
|
&bh);
|
|
if (ret < 0)
|
|
goto err_out_curr_node;
|
|
|
|
stats->bs_nblocks++;
|
|
|
|
lock_buffer(bh);
|
|
nilfs_btree_node_init(btree,
|
|
(struct nilfs_btree_node *)bh->b_data,
|
|
0, level, 0, NULL, NULL);
|
|
unlock_buffer(bh);
|
|
path[level].bp_sib_bh = bh;
|
|
path[level].bp_op = nilfs_btree_split;
|
|
}
|
|
|
|
/* root */
|
|
node = nilfs_btree_get_root(btree);
|
|
if (nilfs_btree_node_get_nchildren(btree, node) <
|
|
nilfs_btree_node_nchildren_max(btree, node)) {
|
|
path[level].bp_op = nilfs_btree_do_insert;
|
|
stats->bs_nblocks++;
|
|
goto out;
|
|
}
|
|
|
|
/* grow */
|
|
path[level].bp_newreq.bpr_ptr = path[level - 1].bp_newreq.bpr_ptr + 1;
|
|
ret = btree->bt_bmap.b_pops->bpop_prepare_alloc_ptr(
|
|
&btree->bt_bmap, &path[level].bp_newreq);
|
|
if (ret < 0)
|
|
goto err_out_child_node;
|
|
ret = nilfs_bmap_get_new_block(&btree->bt_bmap,
|
|
path[level].bp_newreq.bpr_ptr, &bh);
|
|
if (ret < 0)
|
|
goto err_out_curr_node;
|
|
|
|
lock_buffer(bh);
|
|
nilfs_btree_node_init(btree, (struct nilfs_btree_node *)bh->b_data,
|
|
0, level, 0, NULL, NULL);
|
|
unlock_buffer(bh);
|
|
path[level].bp_sib_bh = bh;
|
|
path[level].bp_op = nilfs_btree_grow;
|
|
|
|
level++;
|
|
path[level].bp_op = nilfs_btree_do_insert;
|
|
|
|
/* a newly-created node block and a data block are added */
|
|
stats->bs_nblocks += 2;
|
|
|
|
/* success */
|
|
out:
|
|
*levelp = level;
|
|
return ret;
|
|
|
|
/* error */
|
|
err_out_curr_node:
|
|
btree->bt_bmap.b_pops->bpop_abort_alloc_ptr(&btree->bt_bmap,
|
|
&path[level].bp_newreq);
|
|
err_out_child_node:
|
|
for (level--; level > NILFS_BTREE_LEVEL_DATA; level--) {
|
|
nilfs_bmap_delete_block(&btree->bt_bmap, path[level].bp_sib_bh);
|
|
btree->bt_bmap.b_pops->bpop_abort_alloc_ptr(
|
|
&btree->bt_bmap, &path[level].bp_newreq);
|
|
|
|
}
|
|
|
|
btree->bt_bmap.b_pops->bpop_abort_alloc_ptr(&btree->bt_bmap,
|
|
&path[level].bp_newreq);
|
|
err_out_data:
|
|
*levelp = level;
|
|
stats->bs_nblocks = 0;
|
|
return ret;
|
|
}
|
|
|
|
static void nilfs_btree_commit_insert(struct nilfs_btree *btree,
|
|
struct nilfs_btree_path *path,
|
|
int maxlevel, __u64 key, __u64 ptr)
|
|
{
|
|
int level;
|
|
|
|
set_buffer_nilfs_volatile((struct buffer_head *)((unsigned long)ptr));
|
|
ptr = path[NILFS_BTREE_LEVEL_DATA].bp_newreq.bpr_ptr;
|
|
if (btree->bt_ops->btop_set_target != NULL)
|
|
btree->bt_ops->btop_set_target(btree, key, ptr);
|
|
|
|
for (level = NILFS_BTREE_LEVEL_NODE_MIN; level <= maxlevel; level++) {
|
|
if (btree->bt_bmap.b_pops->bpop_commit_alloc_ptr != NULL) {
|
|
btree->bt_bmap.b_pops->bpop_commit_alloc_ptr(
|
|
&btree->bt_bmap, &path[level - 1].bp_newreq);
|
|
}
|
|
path[level].bp_op(btree, path, level, &key, &ptr);
|
|
}
|
|
|
|
if (!nilfs_bmap_dirty(&btree->bt_bmap))
|
|
nilfs_bmap_set_dirty(&btree->bt_bmap);
|
|
}
|
|
|
|
static int nilfs_btree_insert(struct nilfs_bmap *bmap, __u64 key, __u64 ptr)
|
|
{
|
|
struct nilfs_btree *btree;
|
|
struct nilfs_btree_path *path;
|
|
struct nilfs_bmap_stats stats;
|
|
int level, ret;
|
|
|
|
btree = (struct nilfs_btree *)bmap;
|
|
path = nilfs_btree_alloc_path(btree);
|
|
if (path == NULL)
|
|
return -ENOMEM;
|
|
nilfs_btree_init_path(btree, path);
|
|
|
|
ret = nilfs_btree_do_lookup(btree, path, key, NULL,
|
|
NILFS_BTREE_LEVEL_NODE_MIN);
|
|
if (ret != -ENOENT) {
|
|
if (ret == 0)
|
|
ret = -EEXIST;
|
|
goto out;
|
|
}
|
|
|
|
ret = nilfs_btree_prepare_insert(btree, path, &level, key, ptr, &stats);
|
|
if (ret < 0)
|
|
goto out;
|
|
nilfs_btree_commit_insert(btree, path, level, key, ptr);
|
|
nilfs_bmap_add_blocks(bmap, stats.bs_nblocks);
|
|
|
|
out:
|
|
nilfs_btree_clear_path(btree, path);
|
|
nilfs_btree_free_path(btree, path);
|
|
return ret;
|
|
}
|
|
|
|
static void nilfs_btree_do_delete(struct nilfs_btree *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level, __u64 *keyp, __u64 *ptrp)
|
|
{
|
|
struct nilfs_btree_node *node;
|
|
|
|
if (level < nilfs_btree_height(btree) - 1) {
|
|
lock_buffer(path[level].bp_bh);
|
|
node = nilfs_btree_get_nonroot_node(btree, path, level);
|
|
nilfs_btree_node_delete(btree, node, keyp, ptrp,
|
|
path[level].bp_index);
|
|
if (!buffer_dirty(path[level].bp_bh))
|
|
nilfs_btnode_mark_dirty(path[level].bp_bh);
|
|
unlock_buffer(path[level].bp_bh);
|
|
if (path[level].bp_index == 0)
|
|
nilfs_btree_promote_key(btree, path, level + 1,
|
|
nilfs_btree_node_get_key(btree, node, 0));
|
|
} else {
|
|
node = nilfs_btree_get_root(btree);
|
|
nilfs_btree_node_delete(btree, node, keyp, ptrp,
|
|
path[level].bp_index);
|
|
}
|
|
}
|
|
|
|
static void nilfs_btree_borrow_left(struct nilfs_btree *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level, __u64 *keyp, __u64 *ptrp)
|
|
{
|
|
struct nilfs_btree_node *node, *left;
|
|
int nchildren, lnchildren, n;
|
|
|
|
nilfs_btree_do_delete(btree, path, level, keyp, ptrp);
|
|
|
|
lock_buffer(path[level].bp_bh);
|
|
lock_buffer(path[level].bp_sib_bh);
|
|
|
|
node = nilfs_btree_get_nonroot_node(btree, path, level);
|
|
left = nilfs_btree_get_sib_node(btree, path, level);
|
|
nchildren = nilfs_btree_node_get_nchildren(btree, node);
|
|
lnchildren = nilfs_btree_node_get_nchildren(btree, left);
|
|
|
|
n = (nchildren + lnchildren) / 2 - nchildren;
|
|
|
|
nilfs_btree_node_move_right(btree, left, node, n);
|
|
|
|
if (!buffer_dirty(path[level].bp_bh))
|
|
nilfs_btnode_mark_dirty(path[level].bp_bh);
|
|
if (!buffer_dirty(path[level].bp_sib_bh))
|
|
nilfs_btnode_mark_dirty(path[level].bp_sib_bh);
|
|
|
|
unlock_buffer(path[level].bp_bh);
|
|
unlock_buffer(path[level].bp_sib_bh);
|
|
|
|
nilfs_btree_promote_key(btree, path, level + 1,
|
|
nilfs_btree_node_get_key(btree, node, 0));
|
|
|
|
nilfs_bmap_put_block(&btree->bt_bmap, path[level].bp_sib_bh);
|
|
path[level].bp_sib_bh = NULL;
|
|
path[level].bp_index += n;
|
|
}
|
|
|
|
static void nilfs_btree_borrow_right(struct nilfs_btree *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level, __u64 *keyp, __u64 *ptrp)
|
|
{
|
|
struct nilfs_btree_node *node, *right;
|
|
int nchildren, rnchildren, n;
|
|
|
|
nilfs_btree_do_delete(btree, path, level, keyp, ptrp);
|
|
|
|
lock_buffer(path[level].bp_bh);
|
|
lock_buffer(path[level].bp_sib_bh);
|
|
|
|
node = nilfs_btree_get_nonroot_node(btree, path, level);
|
|
right = nilfs_btree_get_sib_node(btree, path, level);
|
|
nchildren = nilfs_btree_node_get_nchildren(btree, node);
|
|
rnchildren = nilfs_btree_node_get_nchildren(btree, right);
|
|
|
|
n = (nchildren + rnchildren) / 2 - nchildren;
|
|
|
|
nilfs_btree_node_move_left(btree, node, right, n);
|
|
|
|
if (!buffer_dirty(path[level].bp_bh))
|
|
nilfs_btnode_mark_dirty(path[level].bp_bh);
|
|
if (!buffer_dirty(path[level].bp_sib_bh))
|
|
nilfs_btnode_mark_dirty(path[level].bp_sib_bh);
|
|
|
|
unlock_buffer(path[level].bp_bh);
|
|
unlock_buffer(path[level].bp_sib_bh);
|
|
|
|
path[level + 1].bp_index++;
|
|
nilfs_btree_promote_key(btree, path, level + 1,
|
|
nilfs_btree_node_get_key(btree, right, 0));
|
|
path[level + 1].bp_index--;
|
|
|
|
nilfs_bmap_put_block(&btree->bt_bmap, path[level].bp_sib_bh);
|
|
path[level].bp_sib_bh = NULL;
|
|
}
|
|
|
|
static void nilfs_btree_concat_left(struct nilfs_btree *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level, __u64 *keyp, __u64 *ptrp)
|
|
{
|
|
struct nilfs_btree_node *node, *left;
|
|
int n;
|
|
|
|
nilfs_btree_do_delete(btree, path, level, keyp, ptrp);
|
|
|
|
lock_buffer(path[level].bp_bh);
|
|
lock_buffer(path[level].bp_sib_bh);
|
|
|
|
node = nilfs_btree_get_nonroot_node(btree, path, level);
|
|
left = nilfs_btree_get_sib_node(btree, path, level);
|
|
|
|
n = nilfs_btree_node_get_nchildren(btree, node);
|
|
|
|
nilfs_btree_node_move_left(btree, left, node, n);
|
|
|
|
if (!buffer_dirty(path[level].bp_sib_bh))
|
|
nilfs_btnode_mark_dirty(path[level].bp_sib_bh);
|
|
|
|
unlock_buffer(path[level].bp_bh);
|
|
unlock_buffer(path[level].bp_sib_bh);
|
|
|
|
nilfs_bmap_delete_block(&btree->bt_bmap, path[level].bp_bh);
|
|
path[level].bp_bh = path[level].bp_sib_bh;
|
|
path[level].bp_sib_bh = NULL;
|
|
path[level].bp_index += nilfs_btree_node_get_nchildren(btree, left);
|
|
}
|
|
|
|
static void nilfs_btree_concat_right(struct nilfs_btree *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level, __u64 *keyp, __u64 *ptrp)
|
|
{
|
|
struct nilfs_btree_node *node, *right;
|
|
int n;
|
|
|
|
nilfs_btree_do_delete(btree, path, level, keyp, ptrp);
|
|
|
|
lock_buffer(path[level].bp_bh);
|
|
lock_buffer(path[level].bp_sib_bh);
|
|
|
|
node = nilfs_btree_get_nonroot_node(btree, path, level);
|
|
right = nilfs_btree_get_sib_node(btree, path, level);
|
|
|
|
n = nilfs_btree_node_get_nchildren(btree, right);
|
|
|
|
nilfs_btree_node_move_left(btree, node, right, n);
|
|
|
|
if (!buffer_dirty(path[level].bp_bh))
|
|
nilfs_btnode_mark_dirty(path[level].bp_bh);
|
|
|
|
unlock_buffer(path[level].bp_bh);
|
|
unlock_buffer(path[level].bp_sib_bh);
|
|
|
|
nilfs_bmap_delete_block(&btree->bt_bmap, path[level].bp_sib_bh);
|
|
path[level].bp_sib_bh = NULL;
|
|
path[level + 1].bp_index++;
|
|
}
|
|
|
|
static void nilfs_btree_shrink(struct nilfs_btree *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level, __u64 *keyp, __u64 *ptrp)
|
|
{
|
|
struct nilfs_btree_node *root, *child;
|
|
int n;
|
|
|
|
nilfs_btree_do_delete(btree, path, level, keyp, ptrp);
|
|
|
|
lock_buffer(path[level].bp_bh);
|
|
root = nilfs_btree_get_root(btree);
|
|
child = nilfs_btree_get_nonroot_node(btree, path, level);
|
|
|
|
nilfs_btree_node_delete(btree, root, NULL, NULL, 0);
|
|
nilfs_btree_node_set_level(btree, root, level);
|
|
n = nilfs_btree_node_get_nchildren(btree, child);
|
|
nilfs_btree_node_move_left(btree, root, child, n);
|
|
unlock_buffer(path[level].bp_bh);
|
|
|
|
nilfs_bmap_delete_block(&btree->bt_bmap, path[level].bp_bh);
|
|
path[level].bp_bh = NULL;
|
|
}
|
|
|
|
|
|
static int nilfs_btree_prepare_delete(struct nilfs_btree *btree,
|
|
struct nilfs_btree_path *path,
|
|
int *levelp,
|
|
struct nilfs_bmap_stats *stats)
|
|
{
|
|
struct buffer_head *bh;
|
|
struct nilfs_btree_node *node, *parent, *sib;
|
|
__u64 sibptr;
|
|
int pindex, level, ret;
|
|
|
|
ret = 0;
|
|
stats->bs_nblocks = 0;
|
|
for (level = NILFS_BTREE_LEVEL_NODE_MIN;
|
|
level < nilfs_btree_height(btree) - 1;
|
|
level++) {
|
|
node = nilfs_btree_get_nonroot_node(btree, path, level);
|
|
path[level].bp_oldreq.bpr_ptr =
|
|
nilfs_btree_node_get_ptr(btree, node,
|
|
path[level].bp_index);
|
|
if (btree->bt_bmap.b_pops->bpop_prepare_end_ptr != NULL) {
|
|
ret = btree->bt_bmap.b_pops->bpop_prepare_end_ptr(
|
|
&btree->bt_bmap, &path[level].bp_oldreq);
|
|
if (ret < 0)
|
|
goto err_out_child_node;
|
|
}
|
|
|
|
if (nilfs_btree_node_get_nchildren(btree, node) >
|
|
nilfs_btree_node_nchildren_min(btree, node)) {
|
|
path[level].bp_op = nilfs_btree_do_delete;
|
|
stats->bs_nblocks++;
|
|
goto out;
|
|
}
|
|
|
|
parent = nilfs_btree_get_node(btree, path, level + 1);
|
|
pindex = path[level + 1].bp_index;
|
|
|
|
if (pindex > 0) {
|
|
/* left sibling */
|
|
sibptr = nilfs_btree_node_get_ptr(btree, parent,
|
|
pindex - 1);
|
|
ret = nilfs_bmap_get_block(&btree->bt_bmap, sibptr,
|
|
&bh);
|
|
if (ret < 0)
|
|
goto err_out_curr_node;
|
|
sib = (struct nilfs_btree_node *)bh->b_data;
|
|
if (nilfs_btree_node_get_nchildren(btree, sib) >
|
|
nilfs_btree_node_nchildren_min(btree, sib)) {
|
|
path[level].bp_sib_bh = bh;
|
|
path[level].bp_op = nilfs_btree_borrow_left;
|
|
stats->bs_nblocks++;
|
|
goto out;
|
|
} else {
|
|
path[level].bp_sib_bh = bh;
|
|
path[level].bp_op = nilfs_btree_concat_left;
|
|
stats->bs_nblocks++;
|
|
/* continue; */
|
|
}
|
|
} else if (pindex <
|
|
nilfs_btree_node_get_nchildren(btree, parent) - 1) {
|
|
/* right sibling */
|
|
sibptr = nilfs_btree_node_get_ptr(btree, parent,
|
|
pindex + 1);
|
|
ret = nilfs_bmap_get_block(&btree->bt_bmap, sibptr,
|
|
&bh);
|
|
if (ret < 0)
|
|
goto err_out_curr_node;
|
|
sib = (struct nilfs_btree_node *)bh->b_data;
|
|
if (nilfs_btree_node_get_nchildren(btree, sib) >
|
|
nilfs_btree_node_nchildren_min(btree, sib)) {
|
|
path[level].bp_sib_bh = bh;
|
|
path[level].bp_op = nilfs_btree_borrow_right;
|
|
stats->bs_nblocks++;
|
|
goto out;
|
|
} else {
|
|
path[level].bp_sib_bh = bh;
|
|
path[level].bp_op = nilfs_btree_concat_right;
|
|
stats->bs_nblocks++;
|
|
/* continue; */
|
|
}
|
|
} else {
|
|
/* no siblings */
|
|
/* the only child of the root node */
|
|
WARN_ON(level != nilfs_btree_height(btree) - 2);
|
|
if (nilfs_btree_node_get_nchildren(btree, node) - 1 <=
|
|
NILFS_BTREE_ROOT_NCHILDREN_MAX) {
|
|
path[level].bp_op = nilfs_btree_shrink;
|
|
stats->bs_nblocks += 2;
|
|
} else {
|
|
path[level].bp_op = nilfs_btree_do_delete;
|
|
stats->bs_nblocks++;
|
|
}
|
|
|
|
goto out;
|
|
|
|
}
|
|
}
|
|
|
|
node = nilfs_btree_get_root(btree);
|
|
path[level].bp_oldreq.bpr_ptr =
|
|
nilfs_btree_node_get_ptr(btree, node, path[level].bp_index);
|
|
if (btree->bt_bmap.b_pops->bpop_prepare_end_ptr != NULL) {
|
|
ret = btree->bt_bmap.b_pops->bpop_prepare_end_ptr(
|
|
&btree->bt_bmap, &path[level].bp_oldreq);
|
|
if (ret < 0)
|
|
goto err_out_child_node;
|
|
}
|
|
/* child of the root node is deleted */
|
|
path[level].bp_op = nilfs_btree_do_delete;
|
|
stats->bs_nblocks++;
|
|
|
|
/* success */
|
|
out:
|
|
*levelp = level;
|
|
return ret;
|
|
|
|
/* error */
|
|
err_out_curr_node:
|
|
if (btree->bt_bmap.b_pops->bpop_abort_end_ptr != NULL)
|
|
btree->bt_bmap.b_pops->bpop_abort_end_ptr(
|
|
&btree->bt_bmap, &path[level].bp_oldreq);
|
|
err_out_child_node:
|
|
for (level--; level >= NILFS_BTREE_LEVEL_NODE_MIN; level--) {
|
|
nilfs_bmap_put_block(&btree->bt_bmap, path[level].bp_sib_bh);
|
|
if (btree->bt_bmap.b_pops->bpop_abort_end_ptr != NULL)
|
|
btree->bt_bmap.b_pops->bpop_abort_end_ptr(
|
|
&btree->bt_bmap, &path[level].bp_oldreq);
|
|
}
|
|
*levelp = level;
|
|
stats->bs_nblocks = 0;
|
|
return ret;
|
|
}
|
|
|
|
static void nilfs_btree_commit_delete(struct nilfs_btree *btree,
|
|
struct nilfs_btree_path *path,
|
|
int maxlevel)
|
|
{
|
|
int level;
|
|
|
|
for (level = NILFS_BTREE_LEVEL_NODE_MIN; level <= maxlevel; level++) {
|
|
if (btree->bt_bmap.b_pops->bpop_commit_end_ptr != NULL)
|
|
btree->bt_bmap.b_pops->bpop_commit_end_ptr(
|
|
&btree->bt_bmap, &path[level].bp_oldreq);
|
|
path[level].bp_op(btree, path, level, NULL, NULL);
|
|
}
|
|
|
|
if (!nilfs_bmap_dirty(&btree->bt_bmap))
|
|
nilfs_bmap_set_dirty(&btree->bt_bmap);
|
|
}
|
|
|
|
static int nilfs_btree_delete(struct nilfs_bmap *bmap, __u64 key)
|
|
|
|
{
|
|
struct nilfs_btree *btree;
|
|
struct nilfs_btree_path *path;
|
|
struct nilfs_bmap_stats stats;
|
|
int level, ret;
|
|
|
|
btree = (struct nilfs_btree *)bmap;
|
|
path = nilfs_btree_alloc_path(btree);
|
|
if (path == NULL)
|
|
return -ENOMEM;
|
|
nilfs_btree_init_path(btree, path);
|
|
ret = nilfs_btree_do_lookup(btree, path, key, NULL,
|
|
NILFS_BTREE_LEVEL_NODE_MIN);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ret = nilfs_btree_prepare_delete(btree, path, &level, &stats);
|
|
if (ret < 0)
|
|
goto out;
|
|
nilfs_btree_commit_delete(btree, path, level);
|
|
nilfs_bmap_sub_blocks(bmap, stats.bs_nblocks);
|
|
|
|
out:
|
|
nilfs_btree_clear_path(btree, path);
|
|
nilfs_btree_free_path(btree, path);
|
|
return ret;
|
|
}
|
|
|
|
static int nilfs_btree_last_key(const struct nilfs_bmap *bmap, __u64 *keyp)
|
|
{
|
|
struct nilfs_btree *btree;
|
|
struct nilfs_btree_path *path;
|
|
int ret;
|
|
|
|
btree = (struct nilfs_btree *)bmap;
|
|
path = nilfs_btree_alloc_path(btree);
|
|
if (path == NULL)
|
|
return -ENOMEM;
|
|
nilfs_btree_init_path(btree, path);
|
|
|
|
ret = nilfs_btree_do_lookup_last(btree, path, keyp, NULL);
|
|
|
|
nilfs_btree_clear_path(btree, path);
|
|
nilfs_btree_free_path(btree, path);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int nilfs_btree_check_delete(struct nilfs_bmap *bmap, __u64 key)
|
|
{
|
|
struct buffer_head *bh;
|
|
struct nilfs_btree *btree;
|
|
struct nilfs_btree_node *root, *node;
|
|
__u64 maxkey, nextmaxkey;
|
|
__u64 ptr;
|
|
int nchildren, ret;
|
|
|
|
btree = (struct nilfs_btree *)bmap;
|
|
root = nilfs_btree_get_root(btree);
|
|
switch (nilfs_btree_height(btree)) {
|
|
case 2:
|
|
bh = NULL;
|
|
node = root;
|
|
break;
|
|
case 3:
|
|
nchildren = nilfs_btree_node_get_nchildren(btree, root);
|
|
if (nchildren > 1)
|
|
return 0;
|
|
ptr = nilfs_btree_node_get_ptr(btree, root, nchildren - 1);
|
|
ret = nilfs_bmap_get_block(bmap, ptr, &bh);
|
|
if (ret < 0)
|
|
return ret;
|
|
node = (struct nilfs_btree_node *)bh->b_data;
|
|
break;
|
|
default:
|
|
return 0;
|
|
}
|
|
|
|
nchildren = nilfs_btree_node_get_nchildren(btree, node);
|
|
maxkey = nilfs_btree_node_get_key(btree, node, nchildren - 1);
|
|
nextmaxkey = (nchildren > 1) ?
|
|
nilfs_btree_node_get_key(btree, node, nchildren - 2) : 0;
|
|
if (bh != NULL)
|
|
nilfs_bmap_put_block(bmap, bh);
|
|
|
|
return (maxkey == key) && (nextmaxkey < bmap->b_low);
|
|
}
|
|
|
|
static int nilfs_btree_gather_data(struct nilfs_bmap *bmap,
|
|
__u64 *keys, __u64 *ptrs, int nitems)
|
|
{
|
|
struct buffer_head *bh;
|
|
struct nilfs_btree *btree;
|
|
struct nilfs_btree_node *node, *root;
|
|
__le64 *dkeys;
|
|
__le64 *dptrs;
|
|
__u64 ptr;
|
|
int nchildren, i, ret;
|
|
|
|
btree = (struct nilfs_btree *)bmap;
|
|
root = nilfs_btree_get_root(btree);
|
|
switch (nilfs_btree_height(btree)) {
|
|
case 2:
|
|
bh = NULL;
|
|
node = root;
|
|
break;
|
|
case 3:
|
|
nchildren = nilfs_btree_node_get_nchildren(btree, root);
|
|
WARN_ON(nchildren > 1);
|
|
ptr = nilfs_btree_node_get_ptr(btree, root, nchildren - 1);
|
|
ret = nilfs_bmap_get_block(bmap, ptr, &bh);
|
|
if (ret < 0)
|
|
return ret;
|
|
node = (struct nilfs_btree_node *)bh->b_data;
|
|
break;
|
|
default:
|
|
node = NULL;
|
|
return -EINVAL;
|
|
}
|
|
|
|
nchildren = nilfs_btree_node_get_nchildren(btree, node);
|
|
if (nchildren < nitems)
|
|
nitems = nchildren;
|
|
dkeys = nilfs_btree_node_dkeys(btree, node);
|
|
dptrs = nilfs_btree_node_dptrs(btree, node);
|
|
for (i = 0; i < nitems; i++) {
|
|
keys[i] = nilfs_bmap_dkey_to_key(dkeys[i]);
|
|
ptrs[i] = nilfs_bmap_dptr_to_ptr(dptrs[i]);
|
|
}
|
|
|
|
if (bh != NULL)
|
|
nilfs_bmap_put_block(bmap, bh);
|
|
|
|
return nitems;
|
|
}
|
|
|
|
static int
|
|
nilfs_btree_prepare_convert_and_insert(struct nilfs_bmap *bmap, __u64 key,
|
|
union nilfs_bmap_ptr_req *dreq,
|
|
union nilfs_bmap_ptr_req *nreq,
|
|
struct buffer_head **bhp,
|
|
struct nilfs_bmap_stats *stats)
|
|
{
|
|
struct buffer_head *bh;
|
|
struct nilfs_btree *btree;
|
|
int ret;
|
|
|
|
btree = (struct nilfs_btree *)bmap;
|
|
stats->bs_nblocks = 0;
|
|
|
|
/* for data */
|
|
/* cannot find near ptr */
|
|
if (btree->bt_ops->btop_find_target != NULL)
|
|
dreq->bpr_ptr
|
|
= btree->bt_ops->btop_find_target(btree, NULL, key);
|
|
ret = bmap->b_pops->bpop_prepare_alloc_ptr(bmap, dreq);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
*bhp = NULL;
|
|
stats->bs_nblocks++;
|
|
if (nreq != NULL) {
|
|
nreq->bpr_ptr = dreq->bpr_ptr + 1;
|
|
ret = bmap->b_pops->bpop_prepare_alloc_ptr(bmap, nreq);
|
|
if (ret < 0)
|
|
goto err_out_dreq;
|
|
|
|
ret = nilfs_bmap_get_new_block(bmap, nreq->bpr_ptr, &bh);
|
|
if (ret < 0)
|
|
goto err_out_nreq;
|
|
|
|
*bhp = bh;
|
|
stats->bs_nblocks++;
|
|
}
|
|
|
|
/* success */
|
|
return 0;
|
|
|
|
/* error */
|
|
err_out_nreq:
|
|
bmap->b_pops->bpop_abort_alloc_ptr(bmap, nreq);
|
|
err_out_dreq:
|
|
bmap->b_pops->bpop_abort_alloc_ptr(bmap, dreq);
|
|
stats->bs_nblocks = 0;
|
|
return ret;
|
|
|
|
}
|
|
|
|
static void
|
|
nilfs_btree_commit_convert_and_insert(struct nilfs_bmap *bmap,
|
|
__u64 key, __u64 ptr,
|
|
const __u64 *keys, const __u64 *ptrs,
|
|
int n, __u64 low, __u64 high,
|
|
union nilfs_bmap_ptr_req *dreq,
|
|
union nilfs_bmap_ptr_req *nreq,
|
|
struct buffer_head *bh)
|
|
{
|
|
struct nilfs_btree *btree;
|
|
struct nilfs_btree_node *node;
|
|
__u64 tmpptr;
|
|
|
|
/* free resources */
|
|
if (bmap->b_ops->bop_clear != NULL)
|
|
bmap->b_ops->bop_clear(bmap);
|
|
|
|
/* ptr must be a pointer to a buffer head. */
|
|
set_buffer_nilfs_volatile((struct buffer_head *)((unsigned long)ptr));
|
|
|
|
/* convert and insert */
|
|
btree = (struct nilfs_btree *)bmap;
|
|
nilfs_btree_init(bmap, low, high);
|
|
if (nreq != NULL) {
|
|
if (bmap->b_pops->bpop_commit_alloc_ptr != NULL) {
|
|
bmap->b_pops->bpop_commit_alloc_ptr(bmap, dreq);
|
|
bmap->b_pops->bpop_commit_alloc_ptr(bmap, nreq);
|
|
}
|
|
|
|
/* create child node at level 1 */
|
|
lock_buffer(bh);
|
|
node = (struct nilfs_btree_node *)bh->b_data;
|
|
nilfs_btree_node_init(btree, node, 0, 1, n, keys, ptrs);
|
|
nilfs_btree_node_insert(btree, node,
|
|
key, dreq->bpr_ptr, n);
|
|
if (!buffer_dirty(bh))
|
|
nilfs_btnode_mark_dirty(bh);
|
|
if (!nilfs_bmap_dirty(bmap))
|
|
nilfs_bmap_set_dirty(bmap);
|
|
|
|
unlock_buffer(bh);
|
|
nilfs_bmap_put_block(bmap, bh);
|
|
|
|
/* create root node at level 2 */
|
|
node = nilfs_btree_get_root(btree);
|
|
tmpptr = nreq->bpr_ptr;
|
|
nilfs_btree_node_init(btree, node, NILFS_BTREE_NODE_ROOT,
|
|
2, 1, &keys[0], &tmpptr);
|
|
} else {
|
|
if (bmap->b_pops->bpop_commit_alloc_ptr != NULL)
|
|
bmap->b_pops->bpop_commit_alloc_ptr(bmap, dreq);
|
|
|
|
/* create root node at level 1 */
|
|
node = nilfs_btree_get_root(btree);
|
|
nilfs_btree_node_init(btree, node, NILFS_BTREE_NODE_ROOT,
|
|
1, n, keys, ptrs);
|
|
nilfs_btree_node_insert(btree, node,
|
|
key, dreq->bpr_ptr, n);
|
|
if (!nilfs_bmap_dirty(bmap))
|
|
nilfs_bmap_set_dirty(bmap);
|
|
}
|
|
|
|
if (btree->bt_ops->btop_set_target != NULL)
|
|
btree->bt_ops->btop_set_target(btree, key, dreq->bpr_ptr);
|
|
}
|
|
|
|
/**
|
|
* nilfs_btree_convert_and_insert -
|
|
* @bmap:
|
|
* @key:
|
|
* @ptr:
|
|
* @keys:
|
|
* @ptrs:
|
|
* @n:
|
|
* @low:
|
|
* @high:
|
|
*/
|
|
int nilfs_btree_convert_and_insert(struct nilfs_bmap *bmap,
|
|
__u64 key, __u64 ptr,
|
|
const __u64 *keys, const __u64 *ptrs,
|
|
int n, __u64 low, __u64 high)
|
|
{
|
|
struct buffer_head *bh;
|
|
union nilfs_bmap_ptr_req dreq, nreq, *di, *ni;
|
|
struct nilfs_bmap_stats stats;
|
|
int ret;
|
|
|
|
if (n + 1 <= NILFS_BTREE_ROOT_NCHILDREN_MAX) {
|
|
di = &dreq;
|
|
ni = NULL;
|
|
} else if ((n + 1) <= NILFS_BTREE_NODE_NCHILDREN_MAX(
|
|
1 << bmap->b_inode->i_blkbits)) {
|
|
di = &dreq;
|
|
ni = &nreq;
|
|
} else {
|
|
di = NULL;
|
|
ni = NULL;
|
|
BUG();
|
|
}
|
|
|
|
ret = nilfs_btree_prepare_convert_and_insert(bmap, key, di, ni, &bh,
|
|
&stats);
|
|
if (ret < 0)
|
|
return ret;
|
|
nilfs_btree_commit_convert_and_insert(bmap, key, ptr, keys, ptrs, n,
|
|
low, high, di, ni, bh);
|
|
nilfs_bmap_add_blocks(bmap, stats.bs_nblocks);
|
|
return 0;
|
|
}
|
|
|
|
static int nilfs_btree_propagate_p(struct nilfs_btree *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level,
|
|
struct buffer_head *bh)
|
|
{
|
|
while ((++level < nilfs_btree_height(btree) - 1) &&
|
|
!buffer_dirty(path[level].bp_bh))
|
|
nilfs_btnode_mark_dirty(path[level].bp_bh);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nilfs_btree_prepare_update_v(struct nilfs_btree *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level)
|
|
{
|
|
struct nilfs_btree_node *parent;
|
|
int ret;
|
|
|
|
parent = nilfs_btree_get_node(btree, path, level + 1);
|
|
path[level].bp_oldreq.bpr_ptr =
|
|
nilfs_btree_node_get_ptr(btree, parent,
|
|
path[level + 1].bp_index);
|
|
path[level].bp_newreq.bpr_ptr = path[level].bp_oldreq.bpr_ptr + 1;
|
|
ret = nilfs_bmap_prepare_update(&btree->bt_bmap,
|
|
&path[level].bp_oldreq,
|
|
&path[level].bp_newreq);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (buffer_nilfs_node(path[level].bp_bh)) {
|
|
path[level].bp_ctxt.oldkey = path[level].bp_oldreq.bpr_ptr;
|
|
path[level].bp_ctxt.newkey = path[level].bp_newreq.bpr_ptr;
|
|
path[level].bp_ctxt.bh = path[level].bp_bh;
|
|
ret = nilfs_btnode_prepare_change_key(
|
|
&NILFS_BMAP_I(&btree->bt_bmap)->i_btnode_cache,
|
|
&path[level].bp_ctxt);
|
|
if (ret < 0) {
|
|
nilfs_bmap_abort_update(&btree->bt_bmap,
|
|
&path[level].bp_oldreq,
|
|
&path[level].bp_newreq);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void nilfs_btree_commit_update_v(struct nilfs_btree *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level)
|
|
{
|
|
struct nilfs_btree_node *parent;
|
|
|
|
nilfs_bmap_commit_update(&btree->bt_bmap,
|
|
&path[level].bp_oldreq,
|
|
&path[level].bp_newreq);
|
|
|
|
if (buffer_nilfs_node(path[level].bp_bh)) {
|
|
nilfs_btnode_commit_change_key(
|
|
&NILFS_BMAP_I(&btree->bt_bmap)->i_btnode_cache,
|
|
&path[level].bp_ctxt);
|
|
path[level].bp_bh = path[level].bp_ctxt.bh;
|
|
}
|
|
set_buffer_nilfs_volatile(path[level].bp_bh);
|
|
|
|
parent = nilfs_btree_get_node(btree, path, level + 1);
|
|
nilfs_btree_node_set_ptr(btree, parent, path[level + 1].bp_index,
|
|
path[level].bp_newreq.bpr_ptr);
|
|
}
|
|
|
|
static void nilfs_btree_abort_update_v(struct nilfs_btree *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level)
|
|
{
|
|
nilfs_bmap_abort_update(&btree->bt_bmap,
|
|
&path[level].bp_oldreq,
|
|
&path[level].bp_newreq);
|
|
if (buffer_nilfs_node(path[level].bp_bh))
|
|
nilfs_btnode_abort_change_key(
|
|
&NILFS_BMAP_I(&btree->bt_bmap)->i_btnode_cache,
|
|
&path[level].bp_ctxt);
|
|
}
|
|
|
|
static int nilfs_btree_prepare_propagate_v(struct nilfs_btree *btree,
|
|
struct nilfs_btree_path *path,
|
|
int minlevel,
|
|
int *maxlevelp)
|
|
{
|
|
int level, ret;
|
|
|
|
level = minlevel;
|
|
if (!buffer_nilfs_volatile(path[level].bp_bh)) {
|
|
ret = nilfs_btree_prepare_update_v(btree, path, level);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
while ((++level < nilfs_btree_height(btree) - 1) &&
|
|
!buffer_dirty(path[level].bp_bh)) {
|
|
|
|
WARN_ON(buffer_nilfs_volatile(path[level].bp_bh));
|
|
ret = nilfs_btree_prepare_update_v(btree, path, level);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
|
|
/* success */
|
|
*maxlevelp = level - 1;
|
|
return 0;
|
|
|
|
/* error */
|
|
out:
|
|
while (--level > minlevel)
|
|
nilfs_btree_abort_update_v(btree, path, level);
|
|
if (!buffer_nilfs_volatile(path[level].bp_bh))
|
|
nilfs_btree_abort_update_v(btree, path, level);
|
|
return ret;
|
|
}
|
|
|
|
static void nilfs_btree_commit_propagate_v(struct nilfs_btree *btree,
|
|
struct nilfs_btree_path *path,
|
|
int minlevel,
|
|
int maxlevel,
|
|
struct buffer_head *bh)
|
|
{
|
|
int level;
|
|
|
|
if (!buffer_nilfs_volatile(path[minlevel].bp_bh))
|
|
nilfs_btree_commit_update_v(btree, path, minlevel);
|
|
|
|
for (level = minlevel + 1; level <= maxlevel; level++)
|
|
nilfs_btree_commit_update_v(btree, path, level);
|
|
}
|
|
|
|
static int nilfs_btree_propagate_v(struct nilfs_btree *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level,
|
|
struct buffer_head *bh)
|
|
{
|
|
int maxlevel, ret;
|
|
struct nilfs_btree_node *parent;
|
|
__u64 ptr;
|
|
|
|
get_bh(bh);
|
|
path[level].bp_bh = bh;
|
|
ret = nilfs_btree_prepare_propagate_v(btree, path, level, &maxlevel);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
if (buffer_nilfs_volatile(path[level].bp_bh)) {
|
|
parent = nilfs_btree_get_node(btree, path, level + 1);
|
|
ptr = nilfs_btree_node_get_ptr(btree, parent,
|
|
path[level + 1].bp_index);
|
|
ret = nilfs_bmap_mark_dirty(&btree->bt_bmap, ptr);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
|
|
nilfs_btree_commit_propagate_v(btree, path, level, maxlevel, bh);
|
|
|
|
out:
|
|
brelse(path[level].bp_bh);
|
|
path[level].bp_bh = NULL;
|
|
return ret;
|
|
}
|
|
|
|
static int nilfs_btree_propagate(const struct nilfs_bmap *bmap,
|
|
struct buffer_head *bh)
|
|
{
|
|
struct nilfs_btree *btree;
|
|
struct nilfs_btree_path *path;
|
|
struct nilfs_btree_node *node;
|
|
__u64 key;
|
|
int level, ret;
|
|
|
|
WARN_ON(!buffer_dirty(bh));
|
|
|
|
btree = (struct nilfs_btree *)bmap;
|
|
path = nilfs_btree_alloc_path(btree);
|
|
if (path == NULL)
|
|
return -ENOMEM;
|
|
nilfs_btree_init_path(btree, path);
|
|
|
|
if (buffer_nilfs_node(bh)) {
|
|
node = (struct nilfs_btree_node *)bh->b_data;
|
|
key = nilfs_btree_node_get_key(btree, node, 0);
|
|
level = nilfs_btree_node_get_level(btree, node);
|
|
} else {
|
|
key = nilfs_bmap_data_get_key(bmap, bh);
|
|
level = NILFS_BTREE_LEVEL_DATA;
|
|
}
|
|
|
|
ret = nilfs_btree_do_lookup(btree, path, key, NULL, level + 1);
|
|
if (ret < 0) {
|
|
if (unlikely(ret == -ENOENT))
|
|
printk(KERN_CRIT "%s: key = %llu, level == %d\n",
|
|
__func__, (unsigned long long)key, level);
|
|
goto out;
|
|
}
|
|
|
|
ret = btree->bt_ops->btop_propagate(btree, path, level, bh);
|
|
|
|
out:
|
|
nilfs_btree_clear_path(btree, path);
|
|
nilfs_btree_free_path(btree, path);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int nilfs_btree_propagate_gc(const struct nilfs_bmap *bmap,
|
|
struct buffer_head *bh)
|
|
{
|
|
return nilfs_bmap_mark_dirty(bmap, bh->b_blocknr);
|
|
}
|
|
|
|
static void nilfs_btree_add_dirty_buffer(struct nilfs_btree *btree,
|
|
struct list_head *lists,
|
|
struct buffer_head *bh)
|
|
{
|
|
struct list_head *head;
|
|
struct buffer_head *cbh;
|
|
struct nilfs_btree_node *node, *cnode;
|
|
__u64 key, ckey;
|
|
int level;
|
|
|
|
get_bh(bh);
|
|
node = (struct nilfs_btree_node *)bh->b_data;
|
|
key = nilfs_btree_node_get_key(btree, node, 0);
|
|
level = nilfs_btree_node_get_level(btree, node);
|
|
list_for_each(head, &lists[level]) {
|
|
cbh = list_entry(head, struct buffer_head, b_assoc_buffers);
|
|
cnode = (struct nilfs_btree_node *)cbh->b_data;
|
|
ckey = nilfs_btree_node_get_key(btree, cnode, 0);
|
|
if (key < ckey)
|
|
break;
|
|
}
|
|
list_add_tail(&bh->b_assoc_buffers, head);
|
|
}
|
|
|
|
static void nilfs_btree_lookup_dirty_buffers(struct nilfs_bmap *bmap,
|
|
struct list_head *listp)
|
|
{
|
|
struct nilfs_btree *btree = (struct nilfs_btree *)bmap;
|
|
struct address_space *btcache = &NILFS_BMAP_I(bmap)->i_btnode_cache;
|
|
struct list_head lists[NILFS_BTREE_LEVEL_MAX];
|
|
struct pagevec pvec;
|
|
struct buffer_head *bh, *head;
|
|
pgoff_t index = 0;
|
|
int level, i;
|
|
|
|
for (level = NILFS_BTREE_LEVEL_NODE_MIN;
|
|
level < NILFS_BTREE_LEVEL_MAX;
|
|
level++)
|
|
INIT_LIST_HEAD(&lists[level]);
|
|
|
|
pagevec_init(&pvec, 0);
|
|
|
|
while (pagevec_lookup_tag(&pvec, btcache, &index, PAGECACHE_TAG_DIRTY,
|
|
PAGEVEC_SIZE)) {
|
|
for (i = 0; i < pagevec_count(&pvec); i++) {
|
|
bh = head = page_buffers(pvec.pages[i]);
|
|
do {
|
|
if (buffer_dirty(bh))
|
|
nilfs_btree_add_dirty_buffer(btree,
|
|
lists, bh);
|
|
} while ((bh = bh->b_this_page) != head);
|
|
}
|
|
pagevec_release(&pvec);
|
|
cond_resched();
|
|
}
|
|
|
|
for (level = NILFS_BTREE_LEVEL_NODE_MIN;
|
|
level < NILFS_BTREE_LEVEL_MAX;
|
|
level++)
|
|
list_splice(&lists[level], listp->prev);
|
|
}
|
|
|
|
static int nilfs_btree_assign_p(struct nilfs_btree *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level,
|
|
struct buffer_head **bh,
|
|
sector_t blocknr,
|
|
union nilfs_binfo *binfo)
|
|
{
|
|
struct nilfs_btree_node *parent;
|
|
__u64 key;
|
|
__u64 ptr;
|
|
int ret;
|
|
|
|
parent = nilfs_btree_get_node(btree, path, level + 1);
|
|
ptr = nilfs_btree_node_get_ptr(btree, parent,
|
|
path[level + 1].bp_index);
|
|
if (buffer_nilfs_node(*bh)) {
|
|
path[level].bp_ctxt.oldkey = ptr;
|
|
path[level].bp_ctxt.newkey = blocknr;
|
|
path[level].bp_ctxt.bh = *bh;
|
|
ret = nilfs_btnode_prepare_change_key(
|
|
&NILFS_BMAP_I(&btree->bt_bmap)->i_btnode_cache,
|
|
&path[level].bp_ctxt);
|
|
if (ret < 0)
|
|
return ret;
|
|
nilfs_btnode_commit_change_key(
|
|
&NILFS_BMAP_I(&btree->bt_bmap)->i_btnode_cache,
|
|
&path[level].bp_ctxt);
|
|
*bh = path[level].bp_ctxt.bh;
|
|
}
|
|
|
|
nilfs_btree_node_set_ptr(btree, parent,
|
|
path[level + 1].bp_index, blocknr);
|
|
|
|
key = nilfs_btree_node_get_key(btree, parent,
|
|
path[level + 1].bp_index);
|
|
/* on-disk format */
|
|
binfo->bi_dat.bi_blkoff = nilfs_bmap_key_to_dkey(key);
|
|
binfo->bi_dat.bi_level = level;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nilfs_btree_assign_v(struct nilfs_btree *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level,
|
|
struct buffer_head **bh,
|
|
sector_t blocknr,
|
|
union nilfs_binfo *binfo)
|
|
{
|
|
struct nilfs_btree_node *parent;
|
|
__u64 key;
|
|
__u64 ptr;
|
|
union nilfs_bmap_ptr_req req;
|
|
int ret;
|
|
|
|
parent = nilfs_btree_get_node(btree, path, level + 1);
|
|
ptr = nilfs_btree_node_get_ptr(btree, parent,
|
|
path[level + 1].bp_index);
|
|
req.bpr_ptr = ptr;
|
|
ret = btree->bt_bmap.b_pops->bpop_prepare_start_ptr(&btree->bt_bmap,
|
|
&req);
|
|
if (ret < 0)
|
|
return ret;
|
|
btree->bt_bmap.b_pops->bpop_commit_start_ptr(&btree->bt_bmap,
|
|
&req, blocknr);
|
|
|
|
key = nilfs_btree_node_get_key(btree, parent,
|
|
path[level + 1].bp_index);
|
|
/* on-disk format */
|
|
binfo->bi_v.bi_vblocknr = nilfs_bmap_ptr_to_dptr(ptr);
|
|
binfo->bi_v.bi_blkoff = nilfs_bmap_key_to_dkey(key);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nilfs_btree_assign(struct nilfs_bmap *bmap,
|
|
struct buffer_head **bh,
|
|
sector_t blocknr,
|
|
union nilfs_binfo *binfo)
|
|
{
|
|
struct nilfs_btree *btree;
|
|
struct nilfs_btree_path *path;
|
|
struct nilfs_btree_node *node;
|
|
__u64 key;
|
|
int level, ret;
|
|
|
|
btree = (struct nilfs_btree *)bmap;
|
|
path = nilfs_btree_alloc_path(btree);
|
|
if (path == NULL)
|
|
return -ENOMEM;
|
|
nilfs_btree_init_path(btree, path);
|
|
|
|
if (buffer_nilfs_node(*bh)) {
|
|
node = (struct nilfs_btree_node *)(*bh)->b_data;
|
|
key = nilfs_btree_node_get_key(btree, node, 0);
|
|
level = nilfs_btree_node_get_level(btree, node);
|
|
} else {
|
|
key = nilfs_bmap_data_get_key(bmap, *bh);
|
|
level = NILFS_BTREE_LEVEL_DATA;
|
|
}
|
|
|
|
ret = nilfs_btree_do_lookup(btree, path, key, NULL, level + 1);
|
|
if (ret < 0) {
|
|
WARN_ON(ret == -ENOENT);
|
|
goto out;
|
|
}
|
|
|
|
ret = btree->bt_ops->btop_assign(btree, path, level, bh,
|
|
blocknr, binfo);
|
|
|
|
out:
|
|
nilfs_btree_clear_path(btree, path);
|
|
nilfs_btree_free_path(btree, path);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int nilfs_btree_assign_gc(struct nilfs_bmap *bmap,
|
|
struct buffer_head **bh,
|
|
sector_t blocknr,
|
|
union nilfs_binfo *binfo)
|
|
{
|
|
struct nilfs_btree *btree;
|
|
struct nilfs_btree_node *node;
|
|
__u64 key;
|
|
int ret;
|
|
|
|
btree = (struct nilfs_btree *)bmap;
|
|
ret = nilfs_bmap_move_v(bmap, (*bh)->b_blocknr, blocknr);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (buffer_nilfs_node(*bh)) {
|
|
node = (struct nilfs_btree_node *)(*bh)->b_data;
|
|
key = nilfs_btree_node_get_key(btree, node, 0);
|
|
} else
|
|
key = nilfs_bmap_data_get_key(bmap, *bh);
|
|
|
|
/* on-disk format */
|
|
binfo->bi_v.bi_vblocknr = cpu_to_le64((*bh)->b_blocknr);
|
|
binfo->bi_v.bi_blkoff = nilfs_bmap_key_to_dkey(key);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nilfs_btree_mark(struct nilfs_bmap *bmap, __u64 key, int level)
|
|
{
|
|
struct buffer_head *bh;
|
|
struct nilfs_btree *btree;
|
|
struct nilfs_btree_path *path;
|
|
__u64 ptr;
|
|
int ret;
|
|
|
|
btree = (struct nilfs_btree *)bmap;
|
|
path = nilfs_btree_alloc_path(btree);
|
|
if (path == NULL)
|
|
return -ENOMEM;
|
|
nilfs_btree_init_path(btree, path);
|
|
|
|
ret = nilfs_btree_do_lookup(btree, path, key, &ptr, level + 1);
|
|
if (ret < 0) {
|
|
WARN_ON(ret == -ENOENT);
|
|
goto out;
|
|
}
|
|
ret = nilfs_bmap_get_block(&btree->bt_bmap, ptr, &bh);
|
|
if (ret < 0) {
|
|
WARN_ON(ret == -ENOENT);
|
|
goto out;
|
|
}
|
|
|
|
if (!buffer_dirty(bh))
|
|
nilfs_btnode_mark_dirty(bh);
|
|
nilfs_bmap_put_block(&btree->bt_bmap, bh);
|
|
if (!nilfs_bmap_dirty(&btree->bt_bmap))
|
|
nilfs_bmap_set_dirty(&btree->bt_bmap);
|
|
|
|
out:
|
|
nilfs_btree_clear_path(btree, path);
|
|
nilfs_btree_free_path(btree, path);
|
|
return ret;
|
|
}
|
|
|
|
static const struct nilfs_bmap_operations nilfs_btree_ops = {
|
|
.bop_lookup = nilfs_btree_lookup,
|
|
.bop_insert = nilfs_btree_insert,
|
|
.bop_delete = nilfs_btree_delete,
|
|
.bop_clear = NULL,
|
|
|
|
.bop_propagate = nilfs_btree_propagate,
|
|
|
|
.bop_lookup_dirty_buffers = nilfs_btree_lookup_dirty_buffers,
|
|
|
|
.bop_assign = nilfs_btree_assign,
|
|
.bop_mark = nilfs_btree_mark,
|
|
|
|
.bop_last_key = nilfs_btree_last_key,
|
|
.bop_check_insert = NULL,
|
|
.bop_check_delete = nilfs_btree_check_delete,
|
|
.bop_gather_data = nilfs_btree_gather_data,
|
|
};
|
|
|
|
static const struct nilfs_bmap_operations nilfs_btree_ops_gc = {
|
|
.bop_lookup = NULL,
|
|
.bop_insert = NULL,
|
|
.bop_delete = NULL,
|
|
.bop_clear = NULL,
|
|
|
|
.bop_propagate = nilfs_btree_propagate_gc,
|
|
|
|
.bop_lookup_dirty_buffers = nilfs_btree_lookup_dirty_buffers,
|
|
|
|
.bop_assign = nilfs_btree_assign_gc,
|
|
.bop_mark = NULL,
|
|
|
|
.bop_last_key = NULL,
|
|
.bop_check_insert = NULL,
|
|
.bop_check_delete = NULL,
|
|
.bop_gather_data = NULL,
|
|
};
|
|
|
|
static const struct nilfs_btree_operations nilfs_btree_ops_v = {
|
|
.btop_find_target = nilfs_btree_find_target_v,
|
|
.btop_set_target = nilfs_btree_set_target_v,
|
|
.btop_propagate = nilfs_btree_propagate_v,
|
|
.btop_assign = nilfs_btree_assign_v,
|
|
};
|
|
|
|
static const struct nilfs_btree_operations nilfs_btree_ops_p = {
|
|
.btop_find_target = NULL,
|
|
.btop_set_target = NULL,
|
|
.btop_propagate = nilfs_btree_propagate_p,
|
|
.btop_assign = nilfs_btree_assign_p,
|
|
};
|
|
|
|
int nilfs_btree_init(struct nilfs_bmap *bmap, __u64 low, __u64 high)
|
|
{
|
|
struct nilfs_btree *btree;
|
|
|
|
btree = (struct nilfs_btree *)bmap;
|
|
bmap->b_ops = &nilfs_btree_ops;
|
|
bmap->b_low = low;
|
|
bmap->b_high = high;
|
|
switch (bmap->b_inode->i_ino) {
|
|
case NILFS_DAT_INO:
|
|
btree->bt_ops = &nilfs_btree_ops_p;
|
|
break;
|
|
default:
|
|
btree->bt_ops = &nilfs_btree_ops_v;
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void nilfs_btree_init_gc(struct nilfs_bmap *bmap)
|
|
{
|
|
bmap->b_low = NILFS_BMAP_LARGE_LOW;
|
|
bmap->b_high = NILFS_BMAP_LARGE_HIGH;
|
|
bmap->b_ops = &nilfs_btree_ops_gc;
|
|
}
|