2351 lines
61 KiB
C
2351 lines
61 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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#include "dat.h"
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static void __nilfs_btree_init(struct nilfs_bmap *bmap);
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static struct nilfs_btree_path *nilfs_btree_alloc_path(void)
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{
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struct nilfs_btree_path *path;
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int level = NILFS_BTREE_LEVEL_DATA;
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path = kmem_cache_alloc(nilfs_btree_path_cache, GFP_NOFS);
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if (path == NULL)
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goto out;
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for (; level < NILFS_BTREE_LEVEL_MAX; 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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out:
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return path;
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}
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static void nilfs_btree_free_path(struct nilfs_btree_path *path)
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{
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int level = NILFS_BTREE_LEVEL_DATA;
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for (; level < NILFS_BTREE_LEVEL_MAX; level++)
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brelse(path[level].bp_bh);
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kmem_cache_free(nilfs_btree_path_cache, path);
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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 int nilfs_btree_get_new_block(const struct nilfs_bmap *btree,
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__u64 ptr, struct buffer_head **bhp)
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{
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struct address_space *btnc = &NILFS_BMAP_I(btree)->i_btnode_cache;
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struct buffer_head *bh;
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bh = nilfs_btnode_create_block(btnc, ptr);
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if (!bh)
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return -ENOMEM;
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set_buffer_nilfs_volatile(bh);
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*bhp = bh;
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return 0;
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}
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static int nilfs_btree_node_get_flags(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 void
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nilfs_btree_node_set_flags(struct nilfs_btree_node *node, int flags)
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{
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node->bn_flags = flags;
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}
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static int nilfs_btree_node_root(const struct nilfs_btree_node *node)
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{
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return nilfs_btree_node_get_flags(node) & NILFS_BTREE_NODE_ROOT;
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}
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static int nilfs_btree_node_get_level(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 void
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nilfs_btree_node_set_level(struct nilfs_btree_node *node, int level)
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{
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node->bn_level = level;
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}
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static int nilfs_btree_node_get_nchildren(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 void
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nilfs_btree_node_set_nchildren(struct nilfs_btree_node *node, 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 int nilfs_btree_node_size(const struct nilfs_bmap *btree)
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{
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return 1 << btree->b_inode->i_blkbits;
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}
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static int nilfs_btree_nchildren_per_block(const struct nilfs_bmap *btree)
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{
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return btree->b_nchildren_per_block;
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}
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static __le64 *
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nilfs_btree_node_dkeys(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(node) ?
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0 : NILFS_BTREE_NODE_EXTRA_PAD_SIZE));
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}
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static __le64 *
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nilfs_btree_node_dptrs(const struct nilfs_btree_node *node, int ncmax)
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{
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return (__le64 *)(nilfs_btree_node_dkeys(node) + ncmax);
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}
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static __u64
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nilfs_btree_node_get_key(const struct nilfs_btree_node *node, int index)
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{
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return le64_to_cpu(*(nilfs_btree_node_dkeys(node) + index));
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}
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static void
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nilfs_btree_node_set_key(struct nilfs_btree_node *node, int index, __u64 key)
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{
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*(nilfs_btree_node_dkeys(node) + index) = cpu_to_le64(key);
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}
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static __u64
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nilfs_btree_node_get_ptr(const struct nilfs_btree_node *node, int index,
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int ncmax)
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{
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return le64_to_cpu(*(nilfs_btree_node_dptrs(node, ncmax) + index));
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}
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static void
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nilfs_btree_node_set_ptr(struct nilfs_btree_node *node, int index, __u64 ptr,
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int ncmax)
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{
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*(nilfs_btree_node_dptrs(node, ncmax) + index) = cpu_to_le64(ptr);
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}
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static void nilfs_btree_node_init(struct nilfs_btree_node *node, int flags,
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int level, int nchildren, int ncmax,
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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(node, flags);
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nilfs_btree_node_set_level(node, level);
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nilfs_btree_node_set_nchildren(node, nchildren);
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dkeys = nilfs_btree_node_dkeys(node);
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dptrs = nilfs_btree_node_dptrs(node, ncmax);
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for (i = 0; i < nchildren; i++) {
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dkeys[i] = cpu_to_le64(keys[i]);
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dptrs[i] = cpu_to_le64(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_node *left,
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struct nilfs_btree_node *right,
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int n, int lncmax, int rncmax)
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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(left);
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ldptrs = nilfs_btree_node_dptrs(left, lncmax);
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lnchildren = nilfs_btree_node_get_nchildren(left);
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rdkeys = nilfs_btree_node_dkeys(right);
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rdptrs = nilfs_btree_node_dptrs(right, rncmax);
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rnchildren = nilfs_btree_node_get_nchildren(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(left, lnchildren);
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nilfs_btree_node_set_nchildren(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_node *left,
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struct nilfs_btree_node *right,
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int n, int lncmax, int rncmax)
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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(left);
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ldptrs = nilfs_btree_node_dptrs(left, lncmax);
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lnchildren = nilfs_btree_node_get_nchildren(left);
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rdkeys = nilfs_btree_node_dkeys(right);
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rdptrs = nilfs_btree_node_dptrs(right, rncmax);
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rnchildren = nilfs_btree_node_get_nchildren(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(left, lnchildren);
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nilfs_btree_node_set_nchildren(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_node *node, int index,
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__u64 key, __u64 ptr, int ncmax)
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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(node);
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dptrs = nilfs_btree_node_dptrs(node, ncmax);
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nchildren = nilfs_btree_node_get_nchildren(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] = cpu_to_le64(key);
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dptrs[index] = cpu_to_le64(ptr);
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nchildren++;
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nilfs_btree_node_set_nchildren(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_node *node, int index,
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__u64 *keyp, __u64 *ptrp, int ncmax)
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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(node);
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dptrs = nilfs_btree_node_dptrs(node, ncmax);
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key = le64_to_cpu(dkeys[index]);
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ptr = le64_to_cpu(dptrs[index]);
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nchildren = nilfs_btree_node_get_nchildren(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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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(node, nchildren);
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}
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static int nilfs_btree_node_lookup(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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/* binary search */
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low = 0;
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high = nilfs_btree_node_get_nchildren(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(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(node) > 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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}
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/**
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* nilfs_btree_node_broken - verify consistency of btree node
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* @node: btree node block to be examined
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* @size: node size (in bytes)
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* @blocknr: block number
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*
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* Return Value: If node is broken, 1 is returned. Otherwise, 0 is returned.
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*/
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static int nilfs_btree_node_broken(const struct nilfs_btree_node *node,
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size_t size, sector_t blocknr)
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{
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int level, flags, nchildren;
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int ret = 0;
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level = nilfs_btree_node_get_level(node);
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flags = nilfs_btree_node_get_flags(node);
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nchildren = nilfs_btree_node_get_nchildren(node);
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if (unlikely(level < NILFS_BTREE_LEVEL_NODE_MIN ||
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level >= NILFS_BTREE_LEVEL_MAX ||
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(flags & NILFS_BTREE_NODE_ROOT) ||
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nchildren < 0 ||
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nchildren > NILFS_BTREE_NODE_NCHILDREN_MAX(size))) {
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printk(KERN_CRIT "NILFS: bad btree node (blocknr=%llu): "
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"level = %d, flags = 0x%x, nchildren = %d\n",
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(unsigned long long)blocknr, level, flags, nchildren);
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ret = 1;
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}
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return ret;
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}
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/**
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* nilfs_btree_root_broken - verify consistency of btree root node
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* @node: btree root node to be examined
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* @ino: inode number
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*
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* Return Value: If node is broken, 1 is returned. Otherwise, 0 is returned.
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*/
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static int nilfs_btree_root_broken(const struct nilfs_btree_node *node,
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unsigned long ino)
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{
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int level, flags, nchildren;
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int ret = 0;
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level = nilfs_btree_node_get_level(node);
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flags = nilfs_btree_node_get_flags(node);
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nchildren = nilfs_btree_node_get_nchildren(node);
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if (unlikely(level < NILFS_BTREE_LEVEL_NODE_MIN ||
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level >= NILFS_BTREE_LEVEL_MAX ||
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nchildren < 0 ||
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nchildren > NILFS_BTREE_ROOT_NCHILDREN_MAX)) {
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pr_crit("NILFS: bad btree root (inode number=%lu): level = %d, flags = 0x%x, nchildren = %d\n",
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ino, level, flags, nchildren);
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ret = 1;
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}
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return ret;
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}
|
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|
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int nilfs_btree_broken_node_block(struct buffer_head *bh)
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{
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int ret;
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if (buffer_nilfs_checked(bh))
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return 0;
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ret = nilfs_btree_node_broken((struct nilfs_btree_node *)bh->b_data,
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bh->b_size, bh->b_blocknr);
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if (likely(!ret))
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set_buffer_nilfs_checked(bh);
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return ret;
|
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}
|
|
|
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static struct nilfs_btree_node *
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nilfs_btree_get_root(const struct nilfs_bmap *btree)
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{
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return (struct nilfs_btree_node *)btree->b_u.u_data;
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}
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|
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static struct nilfs_btree_node *
|
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nilfs_btree_get_nonroot_node(const struct nilfs_btree_path *path, 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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}
|
|
|
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static struct nilfs_btree_node *
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nilfs_btree_get_sib_node(const struct nilfs_btree_path *path, int level)
|
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{
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return (struct nilfs_btree_node *)path[level].bp_sib_bh->b_data;
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}
|
|
|
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static int nilfs_btree_height(const struct nilfs_bmap *btree)
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{
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return nilfs_btree_node_get_level(nilfs_btree_get_root(btree)) + 1;
|
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}
|
|
|
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static struct nilfs_btree_node *
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nilfs_btree_get_node(const struct nilfs_bmap *btree,
|
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const struct nilfs_btree_path *path,
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int level, int *ncmaxp)
|
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{
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struct nilfs_btree_node *node;
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|
|
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if (level == nilfs_btree_height(btree) - 1) {
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node = nilfs_btree_get_root(btree);
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*ncmaxp = NILFS_BTREE_ROOT_NCHILDREN_MAX;
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} else {
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node = nilfs_btree_get_nonroot_node(path, level);
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*ncmaxp = nilfs_btree_nchildren_per_block(btree);
|
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}
|
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return node;
|
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}
|
|
|
|
static int
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nilfs_btree_bad_node(struct nilfs_btree_node *node, int level)
|
|
{
|
|
if (unlikely(nilfs_btree_node_get_level(node) != level)) {
|
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dump_stack();
|
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printk(KERN_CRIT "NILFS: btree level mismatch: %d != %d\n",
|
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nilfs_btree_node_get_level(node), level);
|
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return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
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struct nilfs_btree_readahead_info {
|
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struct nilfs_btree_node *node; /* parent node */
|
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int max_ra_blocks; /* max nof blocks to read ahead */
|
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int index; /* current index on the parent node */
|
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int ncmax; /* nof children in the parent node */
|
|
};
|
|
|
|
static int __nilfs_btree_get_block(const struct nilfs_bmap *btree, __u64 ptr,
|
|
struct buffer_head **bhp,
|
|
const struct nilfs_btree_readahead_info *ra)
|
|
{
|
|
struct address_space *btnc = &NILFS_BMAP_I(btree)->i_btnode_cache;
|
|
struct buffer_head *bh, *ra_bh;
|
|
sector_t submit_ptr = 0;
|
|
int ret;
|
|
|
|
ret = nilfs_btnode_submit_block(btnc, ptr, 0, READ, &bh, &submit_ptr);
|
|
if (ret) {
|
|
if (ret != -EEXIST)
|
|
return ret;
|
|
goto out_check;
|
|
}
|
|
|
|
if (ra) {
|
|
int i, n;
|
|
__u64 ptr2;
|
|
|
|
/* read ahead sibling nodes */
|
|
for (n = ra->max_ra_blocks, i = ra->index + 1;
|
|
n > 0 && i < ra->ncmax; n--, i++) {
|
|
ptr2 = nilfs_btree_node_get_ptr(ra->node, i, ra->ncmax);
|
|
|
|
ret = nilfs_btnode_submit_block(btnc, ptr2, 0, READA,
|
|
&ra_bh, &submit_ptr);
|
|
if (likely(!ret || ret == -EEXIST))
|
|
brelse(ra_bh);
|
|
else if (ret != -EBUSY)
|
|
break;
|
|
if (!buffer_locked(bh))
|
|
goto out_no_wait;
|
|
}
|
|
}
|
|
|
|
wait_on_buffer(bh);
|
|
|
|
out_no_wait:
|
|
if (!buffer_uptodate(bh)) {
|
|
brelse(bh);
|
|
return -EIO;
|
|
}
|
|
|
|
out_check:
|
|
if (nilfs_btree_broken_node_block(bh)) {
|
|
clear_buffer_uptodate(bh);
|
|
brelse(bh);
|
|
return -EINVAL;
|
|
}
|
|
|
|
*bhp = bh;
|
|
return 0;
|
|
}
|
|
|
|
static int nilfs_btree_get_block(const struct nilfs_bmap *btree, __u64 ptr,
|
|
struct buffer_head **bhp)
|
|
{
|
|
return __nilfs_btree_get_block(btree, ptr, bhp, NULL);
|
|
}
|
|
|
|
static int nilfs_btree_do_lookup(const struct nilfs_bmap *btree,
|
|
struct nilfs_btree_path *path,
|
|
__u64 key, __u64 *ptrp, int minlevel,
|
|
int readahead)
|
|
{
|
|
struct nilfs_btree_node *node;
|
|
struct nilfs_btree_readahead_info p, *ra;
|
|
__u64 ptr;
|
|
int level, index, found, ncmax, ret;
|
|
|
|
node = nilfs_btree_get_root(btree);
|
|
level = nilfs_btree_node_get_level(node);
|
|
if (level < minlevel || nilfs_btree_node_get_nchildren(node) <= 0)
|
|
return -ENOENT;
|
|
|
|
found = nilfs_btree_node_lookup(node, key, &index);
|
|
ptr = nilfs_btree_node_get_ptr(node, index,
|
|
NILFS_BTREE_ROOT_NCHILDREN_MAX);
|
|
path[level].bp_bh = NULL;
|
|
path[level].bp_index = index;
|
|
|
|
ncmax = nilfs_btree_nchildren_per_block(btree);
|
|
|
|
while (--level >= minlevel) {
|
|
ra = NULL;
|
|
if (level == NILFS_BTREE_LEVEL_NODE_MIN && readahead) {
|
|
p.node = nilfs_btree_get_node(btree, path, level + 1,
|
|
&p.ncmax);
|
|
p.index = index;
|
|
p.max_ra_blocks = 7;
|
|
ra = &p;
|
|
}
|
|
ret = __nilfs_btree_get_block(btree, ptr, &path[level].bp_bh,
|
|
ra);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
node = nilfs_btree_get_nonroot_node(path, level);
|
|
if (nilfs_btree_bad_node(node, level))
|
|
return -EINVAL;
|
|
if (!found)
|
|
found = nilfs_btree_node_lookup(node, key, &index);
|
|
else
|
|
index = 0;
|
|
if (index < ncmax) {
|
|
ptr = nilfs_btree_node_get_ptr(node, index, ncmax);
|
|
} 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_bmap *btree,
|
|
struct nilfs_btree_path *path,
|
|
__u64 *keyp, __u64 *ptrp)
|
|
{
|
|
struct nilfs_btree_node *node;
|
|
__u64 ptr;
|
|
int index, level, ncmax, ret;
|
|
|
|
node = nilfs_btree_get_root(btree);
|
|
index = nilfs_btree_node_get_nchildren(node) - 1;
|
|
if (index < 0)
|
|
return -ENOENT;
|
|
level = nilfs_btree_node_get_level(node);
|
|
ptr = nilfs_btree_node_get_ptr(node, index,
|
|
NILFS_BTREE_ROOT_NCHILDREN_MAX);
|
|
path[level].bp_bh = NULL;
|
|
path[level].bp_index = index;
|
|
ncmax = nilfs_btree_nchildren_per_block(btree);
|
|
|
|
for (level--; level > 0; level--) {
|
|
ret = nilfs_btree_get_block(btree, ptr, &path[level].bp_bh);
|
|
if (ret < 0)
|
|
return ret;
|
|
node = nilfs_btree_get_nonroot_node(path, level);
|
|
if (nilfs_btree_bad_node(node, level))
|
|
return -EINVAL;
|
|
index = nilfs_btree_node_get_nchildren(node) - 1;
|
|
ptr = nilfs_btree_node_get_ptr(node, index, ncmax);
|
|
path[level].bp_index = index;
|
|
}
|
|
|
|
if (keyp != NULL)
|
|
*keyp = nilfs_btree_node_get_key(node, index);
|
|
if (ptrp != NULL)
|
|
*ptrp = ptr;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nilfs_btree_lookup(const struct nilfs_bmap *btree,
|
|
__u64 key, int level, __u64 *ptrp)
|
|
{
|
|
struct nilfs_btree_path *path;
|
|
int ret;
|
|
|
|
path = nilfs_btree_alloc_path();
|
|
if (path == NULL)
|
|
return -ENOMEM;
|
|
|
|
ret = nilfs_btree_do_lookup(btree, path, key, ptrp, level, 0);
|
|
|
|
nilfs_btree_free_path(path);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int nilfs_btree_lookup_contig(const struct nilfs_bmap *btree,
|
|
__u64 key, __u64 *ptrp, unsigned maxblocks)
|
|
{
|
|
struct nilfs_btree_path *path;
|
|
struct nilfs_btree_node *node;
|
|
struct inode *dat = NULL;
|
|
__u64 ptr, ptr2;
|
|
sector_t blocknr;
|
|
int level = NILFS_BTREE_LEVEL_NODE_MIN;
|
|
int ret, cnt, index, maxlevel, ncmax;
|
|
struct nilfs_btree_readahead_info p;
|
|
|
|
path = nilfs_btree_alloc_path();
|
|
if (path == NULL)
|
|
return -ENOMEM;
|
|
|
|
ret = nilfs_btree_do_lookup(btree, path, key, &ptr, level, 1);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
if (NILFS_BMAP_USE_VBN(btree)) {
|
|
dat = nilfs_bmap_get_dat(btree);
|
|
ret = nilfs_dat_translate(dat, ptr, &blocknr);
|
|
if (ret < 0)
|
|
goto out;
|
|
ptr = blocknr;
|
|
}
|
|
cnt = 1;
|
|
if (cnt == maxblocks)
|
|
goto end;
|
|
|
|
maxlevel = nilfs_btree_height(btree) - 1;
|
|
node = nilfs_btree_get_node(btree, path, level, &ncmax);
|
|
index = path[level].bp_index + 1;
|
|
for (;;) {
|
|
while (index < nilfs_btree_node_get_nchildren(node)) {
|
|
if (nilfs_btree_node_get_key(node, index) !=
|
|
key + cnt)
|
|
goto end;
|
|
ptr2 = nilfs_btree_node_get_ptr(node, index, ncmax);
|
|
if (dat) {
|
|
ret = nilfs_dat_translate(dat, ptr2, &blocknr);
|
|
if (ret < 0)
|
|
goto out;
|
|
ptr2 = blocknr;
|
|
}
|
|
if (ptr2 != ptr + cnt || ++cnt == maxblocks)
|
|
goto end;
|
|
index++;
|
|
continue;
|
|
}
|
|
if (level == maxlevel)
|
|
break;
|
|
|
|
/* look-up right sibling node */
|
|
p.node = nilfs_btree_get_node(btree, path, level + 1, &p.ncmax);
|
|
p.index = path[level + 1].bp_index + 1;
|
|
p.max_ra_blocks = 7;
|
|
if (p.index >= nilfs_btree_node_get_nchildren(p.node) ||
|
|
nilfs_btree_node_get_key(p.node, p.index) != key + cnt)
|
|
break;
|
|
ptr2 = nilfs_btree_node_get_ptr(p.node, p.index, p.ncmax);
|
|
path[level + 1].bp_index = p.index;
|
|
|
|
brelse(path[level].bp_bh);
|
|
path[level].bp_bh = NULL;
|
|
|
|
ret = __nilfs_btree_get_block(btree, ptr2, &path[level].bp_bh,
|
|
&p);
|
|
if (ret < 0)
|
|
goto out;
|
|
node = nilfs_btree_get_nonroot_node(path, level);
|
|
ncmax = nilfs_btree_nchildren_per_block(btree);
|
|
index = 0;
|
|
path[level].bp_index = index;
|
|
}
|
|
end:
|
|
*ptrp = ptr;
|
|
ret = cnt;
|
|
out:
|
|
nilfs_btree_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static void nilfs_btree_promote_key(struct nilfs_bmap *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level, __u64 key)
|
|
{
|
|
if (level < nilfs_btree_height(btree) - 1) {
|
|
do {
|
|
nilfs_btree_node_set_key(
|
|
nilfs_btree_get_nonroot_node(path, level),
|
|
path[level].bp_index, key);
|
|
if (!buffer_dirty(path[level].bp_bh))
|
|
mark_buffer_dirty(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(nilfs_btree_get_root(btree),
|
|
path[level].bp_index, key);
|
|
}
|
|
}
|
|
|
|
static void nilfs_btree_do_insert(struct nilfs_bmap *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level, __u64 *keyp, __u64 *ptrp)
|
|
{
|
|
struct nilfs_btree_node *node;
|
|
int ncblk;
|
|
|
|
if (level < nilfs_btree_height(btree) - 1) {
|
|
node = nilfs_btree_get_nonroot_node(path, level);
|
|
ncblk = nilfs_btree_nchildren_per_block(btree);
|
|
nilfs_btree_node_insert(node, path[level].bp_index,
|
|
*keyp, *ptrp, ncblk);
|
|
if (!buffer_dirty(path[level].bp_bh))
|
|
mark_buffer_dirty(path[level].bp_bh);
|
|
|
|
if (path[level].bp_index == 0)
|
|
nilfs_btree_promote_key(btree, path, level + 1,
|
|
nilfs_btree_node_get_key(node,
|
|
0));
|
|
} else {
|
|
node = nilfs_btree_get_root(btree);
|
|
nilfs_btree_node_insert(node, path[level].bp_index,
|
|
*keyp, *ptrp,
|
|
NILFS_BTREE_ROOT_NCHILDREN_MAX);
|
|
}
|
|
}
|
|
|
|
static void nilfs_btree_carry_left(struct nilfs_bmap *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level, __u64 *keyp, __u64 *ptrp)
|
|
{
|
|
struct nilfs_btree_node *node, *left;
|
|
int nchildren, lnchildren, n, move, ncblk;
|
|
|
|
node = nilfs_btree_get_nonroot_node(path, level);
|
|
left = nilfs_btree_get_sib_node(path, level);
|
|
nchildren = nilfs_btree_node_get_nchildren(node);
|
|
lnchildren = nilfs_btree_node_get_nchildren(left);
|
|
ncblk = nilfs_btree_nchildren_per_block(btree);
|
|
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(left, node, n, ncblk, ncblk);
|
|
|
|
if (!buffer_dirty(path[level].bp_bh))
|
|
mark_buffer_dirty(path[level].bp_bh);
|
|
if (!buffer_dirty(path[level].bp_sib_bh))
|
|
mark_buffer_dirty(path[level].bp_sib_bh);
|
|
|
|
nilfs_btree_promote_key(btree, path, level + 1,
|
|
nilfs_btree_node_get_key(node, 0));
|
|
|
|
if (move) {
|
|
brelse(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 {
|
|
brelse(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_bmap *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level, __u64 *keyp, __u64 *ptrp)
|
|
{
|
|
struct nilfs_btree_node *node, *right;
|
|
int nchildren, rnchildren, n, move, ncblk;
|
|
|
|
node = nilfs_btree_get_nonroot_node(path, level);
|
|
right = nilfs_btree_get_sib_node(path, level);
|
|
nchildren = nilfs_btree_node_get_nchildren(node);
|
|
rnchildren = nilfs_btree_node_get_nchildren(right);
|
|
ncblk = nilfs_btree_nchildren_per_block(btree);
|
|
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(node, right, n, ncblk, ncblk);
|
|
|
|
if (!buffer_dirty(path[level].bp_bh))
|
|
mark_buffer_dirty(path[level].bp_bh);
|
|
if (!buffer_dirty(path[level].bp_sib_bh))
|
|
mark_buffer_dirty(path[level].bp_sib_bh);
|
|
|
|
path[level + 1].bp_index++;
|
|
nilfs_btree_promote_key(btree, path, level + 1,
|
|
nilfs_btree_node_get_key(right, 0));
|
|
path[level + 1].bp_index--;
|
|
|
|
if (move) {
|
|
brelse(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(node);
|
|
path[level + 1].bp_index++;
|
|
} else {
|
|
brelse(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_bmap *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, ncblk;
|
|
|
|
node = nilfs_btree_get_nonroot_node(path, level);
|
|
right = nilfs_btree_get_sib_node(path, level);
|
|
nchildren = nilfs_btree_node_get_nchildren(node);
|
|
ncblk = nilfs_btree_nchildren_per_block(btree);
|
|
move = 0;
|
|
|
|
n = (nchildren + 1) / 2;
|
|
if (n > nchildren - path[level].bp_index) {
|
|
n--;
|
|
move = 1;
|
|
}
|
|
|
|
nilfs_btree_node_move_right(node, right, n, ncblk, ncblk);
|
|
|
|
if (!buffer_dirty(path[level].bp_bh))
|
|
mark_buffer_dirty(path[level].bp_bh);
|
|
if (!buffer_dirty(path[level].bp_sib_bh))
|
|
mark_buffer_dirty(path[level].bp_sib_bh);
|
|
|
|
newkey = nilfs_btree_node_get_key(right, 0);
|
|
newptr = path[level].bp_newreq.bpr_ptr;
|
|
|
|
if (move) {
|
|
path[level].bp_index -= nilfs_btree_node_get_nchildren(node);
|
|
nilfs_btree_node_insert(right, path[level].bp_index,
|
|
*keyp, *ptrp, ncblk);
|
|
|
|
*keyp = nilfs_btree_node_get_key(right, 0);
|
|
*ptrp = path[level].bp_newreq.bpr_ptr;
|
|
|
|
brelse(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(right, 0);
|
|
*ptrp = path[level].bp_newreq.bpr_ptr;
|
|
|
|
brelse(path[level].bp_sib_bh);
|
|
path[level].bp_sib_bh = NULL;
|
|
}
|
|
|
|
path[level + 1].bp_index++;
|
|
}
|
|
|
|
static void nilfs_btree_grow(struct nilfs_bmap *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level, __u64 *keyp, __u64 *ptrp)
|
|
{
|
|
struct nilfs_btree_node *root, *child;
|
|
int n, ncblk;
|
|
|
|
root = nilfs_btree_get_root(btree);
|
|
child = nilfs_btree_get_sib_node(path, level);
|
|
ncblk = nilfs_btree_nchildren_per_block(btree);
|
|
|
|
n = nilfs_btree_node_get_nchildren(root);
|
|
|
|
nilfs_btree_node_move_right(root, child, n,
|
|
NILFS_BTREE_ROOT_NCHILDREN_MAX, ncblk);
|
|
nilfs_btree_node_set_level(root, level + 1);
|
|
|
|
if (!buffer_dirty(path[level].bp_sib_bh))
|
|
mark_buffer_dirty(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(child, 0);
|
|
*ptrp = path[level].bp_newreq.bpr_ptr;
|
|
}
|
|
|
|
static __u64 nilfs_btree_find_near(const struct nilfs_bmap *btree,
|
|
const struct nilfs_btree_path *path)
|
|
{
|
|
struct nilfs_btree_node *node;
|
|
int level, ncmax;
|
|
|
|
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, &ncmax);
|
|
return nilfs_btree_node_get_ptr(node,
|
|
path[level].bp_index - 1,
|
|
ncmax);
|
|
}
|
|
|
|
/* parent */
|
|
level = NILFS_BTREE_LEVEL_NODE_MIN + 1;
|
|
if (level <= nilfs_btree_height(btree) - 1) {
|
|
node = nilfs_btree_get_node(btree, path, level, &ncmax);
|
|
return nilfs_btree_node_get_ptr(node, path[level].bp_index,
|
|
ncmax);
|
|
}
|
|
|
|
return NILFS_BMAP_INVALID_PTR;
|
|
}
|
|
|
|
static __u64 nilfs_btree_find_target_v(const struct nilfs_bmap *btree,
|
|
const struct nilfs_btree_path *path,
|
|
__u64 key)
|
|
{
|
|
__u64 ptr;
|
|
|
|
ptr = nilfs_bmap_find_target_seq(btree, 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);
|
|
}
|
|
|
|
static int nilfs_btree_prepare_insert(struct nilfs_bmap *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, ncmax, ncblk, ret;
|
|
struct inode *dat = NULL;
|
|
|
|
stats->bs_nblocks = 0;
|
|
level = NILFS_BTREE_LEVEL_DATA;
|
|
|
|
/* allocate a new ptr for data block */
|
|
if (NILFS_BMAP_USE_VBN(btree)) {
|
|
path[level].bp_newreq.bpr_ptr =
|
|
nilfs_btree_find_target_v(btree, path, key);
|
|
dat = nilfs_bmap_get_dat(btree);
|
|
}
|
|
|
|
ret = nilfs_bmap_prepare_alloc_ptr(btree, &path[level].bp_newreq, dat);
|
|
if (ret < 0)
|
|
goto err_out_data;
|
|
|
|
ncblk = nilfs_btree_nchildren_per_block(btree);
|
|
|
|
for (level = NILFS_BTREE_LEVEL_NODE_MIN;
|
|
level < nilfs_btree_height(btree) - 1;
|
|
level++) {
|
|
node = nilfs_btree_get_nonroot_node(path, level);
|
|
if (nilfs_btree_node_get_nchildren(node) < ncblk) {
|
|
path[level].bp_op = nilfs_btree_do_insert;
|
|
stats->bs_nblocks++;
|
|
goto out;
|
|
}
|
|
|
|
parent = nilfs_btree_get_node(btree, path, level + 1, &ncmax);
|
|
pindex = path[level + 1].bp_index;
|
|
|
|
/* left sibling */
|
|
if (pindex > 0) {
|
|
sibptr = nilfs_btree_node_get_ptr(parent, pindex - 1,
|
|
ncmax);
|
|
ret = nilfs_btree_get_block(btree, sibptr, &bh);
|
|
if (ret < 0)
|
|
goto err_out_child_node;
|
|
sib = (struct nilfs_btree_node *)bh->b_data;
|
|
if (nilfs_btree_node_get_nchildren(sib) < ncblk) {
|
|
path[level].bp_sib_bh = bh;
|
|
path[level].bp_op = nilfs_btree_carry_left;
|
|
stats->bs_nblocks++;
|
|
goto out;
|
|
} else {
|
|
brelse(bh);
|
|
}
|
|
}
|
|
|
|
/* right sibling */
|
|
if (pindex < nilfs_btree_node_get_nchildren(parent) - 1) {
|
|
sibptr = nilfs_btree_node_get_ptr(parent, pindex + 1,
|
|
ncmax);
|
|
ret = nilfs_btree_get_block(btree, sibptr, &bh);
|
|
if (ret < 0)
|
|
goto err_out_child_node;
|
|
sib = (struct nilfs_btree_node *)bh->b_data;
|
|
if (nilfs_btree_node_get_nchildren(sib) < ncblk) {
|
|
path[level].bp_sib_bh = bh;
|
|
path[level].bp_op = nilfs_btree_carry_right;
|
|
stats->bs_nblocks++;
|
|
goto out;
|
|
} else {
|
|
brelse(bh);
|
|
}
|
|
}
|
|
|
|
/* split */
|
|
path[level].bp_newreq.bpr_ptr =
|
|
path[level - 1].bp_newreq.bpr_ptr + 1;
|
|
ret = nilfs_bmap_prepare_alloc_ptr(btree,
|
|
&path[level].bp_newreq, dat);
|
|
if (ret < 0)
|
|
goto err_out_child_node;
|
|
ret = nilfs_btree_get_new_block(btree,
|
|
path[level].bp_newreq.bpr_ptr,
|
|
&bh);
|
|
if (ret < 0)
|
|
goto err_out_curr_node;
|
|
|
|
stats->bs_nblocks++;
|
|
|
|
sib = (struct nilfs_btree_node *)bh->b_data;
|
|
nilfs_btree_node_init(sib, 0, level, 0, ncblk, NULL, NULL);
|
|
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(node) <
|
|
NILFS_BTREE_ROOT_NCHILDREN_MAX) {
|
|
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 = nilfs_bmap_prepare_alloc_ptr(btree, &path[level].bp_newreq, dat);
|
|
if (ret < 0)
|
|
goto err_out_child_node;
|
|
ret = nilfs_btree_get_new_block(btree, path[level].bp_newreq.bpr_ptr,
|
|
&bh);
|
|
if (ret < 0)
|
|
goto err_out_curr_node;
|
|
|
|
nilfs_btree_node_init((struct nilfs_btree_node *)bh->b_data,
|
|
0, level, 0, ncblk, NULL, NULL);
|
|
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:
|
|
nilfs_bmap_abort_alloc_ptr(btree, &path[level].bp_newreq, dat);
|
|
err_out_child_node:
|
|
for (level--; level > NILFS_BTREE_LEVEL_DATA; level--) {
|
|
nilfs_btnode_delete(path[level].bp_sib_bh);
|
|
nilfs_bmap_abort_alloc_ptr(btree, &path[level].bp_newreq, dat);
|
|
|
|
}
|
|
|
|
nilfs_bmap_abort_alloc_ptr(btree, &path[level].bp_newreq, dat);
|
|
err_out_data:
|
|
*levelp = level;
|
|
stats->bs_nblocks = 0;
|
|
return ret;
|
|
}
|
|
|
|
static void nilfs_btree_commit_insert(struct nilfs_bmap *btree,
|
|
struct nilfs_btree_path *path,
|
|
int maxlevel, __u64 key, __u64 ptr)
|
|
{
|
|
struct inode *dat = NULL;
|
|
int level;
|
|
|
|
set_buffer_nilfs_volatile((struct buffer_head *)((unsigned long)ptr));
|
|
ptr = path[NILFS_BTREE_LEVEL_DATA].bp_newreq.bpr_ptr;
|
|
if (NILFS_BMAP_USE_VBN(btree)) {
|
|
nilfs_bmap_set_target_v(btree, key, ptr);
|
|
dat = nilfs_bmap_get_dat(btree);
|
|
}
|
|
|
|
for (level = NILFS_BTREE_LEVEL_NODE_MIN; level <= maxlevel; level++) {
|
|
nilfs_bmap_commit_alloc_ptr(btree,
|
|
&path[level - 1].bp_newreq, dat);
|
|
path[level].bp_op(btree, path, level, &key, &ptr);
|
|
}
|
|
|
|
if (!nilfs_bmap_dirty(btree))
|
|
nilfs_bmap_set_dirty(btree);
|
|
}
|
|
|
|
static int nilfs_btree_insert(struct nilfs_bmap *btree, __u64 key, __u64 ptr)
|
|
{
|
|
struct nilfs_btree_path *path;
|
|
struct nilfs_bmap_stats stats;
|
|
int level, ret;
|
|
|
|
path = nilfs_btree_alloc_path();
|
|
if (path == NULL)
|
|
return -ENOMEM;
|
|
|
|
ret = nilfs_btree_do_lookup(btree, path, key, NULL,
|
|
NILFS_BTREE_LEVEL_NODE_MIN, 0);
|
|
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_inode_add_blocks(btree->b_inode, stats.bs_nblocks);
|
|
|
|
out:
|
|
nilfs_btree_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static void nilfs_btree_do_delete(struct nilfs_bmap *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level, __u64 *keyp, __u64 *ptrp)
|
|
{
|
|
struct nilfs_btree_node *node;
|
|
int ncblk;
|
|
|
|
if (level < nilfs_btree_height(btree) - 1) {
|
|
node = nilfs_btree_get_nonroot_node(path, level);
|
|
ncblk = nilfs_btree_nchildren_per_block(btree);
|
|
nilfs_btree_node_delete(node, path[level].bp_index,
|
|
keyp, ptrp, ncblk);
|
|
if (!buffer_dirty(path[level].bp_bh))
|
|
mark_buffer_dirty(path[level].bp_bh);
|
|
if (path[level].bp_index == 0)
|
|
nilfs_btree_promote_key(btree, path, level + 1,
|
|
nilfs_btree_node_get_key(node, 0));
|
|
} else {
|
|
node = nilfs_btree_get_root(btree);
|
|
nilfs_btree_node_delete(node, path[level].bp_index,
|
|
keyp, ptrp,
|
|
NILFS_BTREE_ROOT_NCHILDREN_MAX);
|
|
}
|
|
}
|
|
|
|
static void nilfs_btree_borrow_left(struct nilfs_bmap *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level, __u64 *keyp, __u64 *ptrp)
|
|
{
|
|
struct nilfs_btree_node *node, *left;
|
|
int nchildren, lnchildren, n, ncblk;
|
|
|
|
nilfs_btree_do_delete(btree, path, level, keyp, ptrp);
|
|
|
|
node = nilfs_btree_get_nonroot_node(path, level);
|
|
left = nilfs_btree_get_sib_node(path, level);
|
|
nchildren = nilfs_btree_node_get_nchildren(node);
|
|
lnchildren = nilfs_btree_node_get_nchildren(left);
|
|
ncblk = nilfs_btree_nchildren_per_block(btree);
|
|
|
|
n = (nchildren + lnchildren) / 2 - nchildren;
|
|
|
|
nilfs_btree_node_move_right(left, node, n, ncblk, ncblk);
|
|
|
|
if (!buffer_dirty(path[level].bp_bh))
|
|
mark_buffer_dirty(path[level].bp_bh);
|
|
if (!buffer_dirty(path[level].bp_sib_bh))
|
|
mark_buffer_dirty(path[level].bp_sib_bh);
|
|
|
|
nilfs_btree_promote_key(btree, path, level + 1,
|
|
nilfs_btree_node_get_key(node, 0));
|
|
|
|
brelse(path[level].bp_sib_bh);
|
|
path[level].bp_sib_bh = NULL;
|
|
path[level].bp_index += n;
|
|
}
|
|
|
|
static void nilfs_btree_borrow_right(struct nilfs_bmap *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level, __u64 *keyp, __u64 *ptrp)
|
|
{
|
|
struct nilfs_btree_node *node, *right;
|
|
int nchildren, rnchildren, n, ncblk;
|
|
|
|
nilfs_btree_do_delete(btree, path, level, keyp, ptrp);
|
|
|
|
node = nilfs_btree_get_nonroot_node(path, level);
|
|
right = nilfs_btree_get_sib_node(path, level);
|
|
nchildren = nilfs_btree_node_get_nchildren(node);
|
|
rnchildren = nilfs_btree_node_get_nchildren(right);
|
|
ncblk = nilfs_btree_nchildren_per_block(btree);
|
|
|
|
n = (nchildren + rnchildren) / 2 - nchildren;
|
|
|
|
nilfs_btree_node_move_left(node, right, n, ncblk, ncblk);
|
|
|
|
if (!buffer_dirty(path[level].bp_bh))
|
|
mark_buffer_dirty(path[level].bp_bh);
|
|
if (!buffer_dirty(path[level].bp_sib_bh))
|
|
mark_buffer_dirty(path[level].bp_sib_bh);
|
|
|
|
path[level + 1].bp_index++;
|
|
nilfs_btree_promote_key(btree, path, level + 1,
|
|
nilfs_btree_node_get_key(right, 0));
|
|
path[level + 1].bp_index--;
|
|
|
|
brelse(path[level].bp_sib_bh);
|
|
path[level].bp_sib_bh = NULL;
|
|
}
|
|
|
|
static void nilfs_btree_concat_left(struct nilfs_bmap *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level, __u64 *keyp, __u64 *ptrp)
|
|
{
|
|
struct nilfs_btree_node *node, *left;
|
|
int n, ncblk;
|
|
|
|
nilfs_btree_do_delete(btree, path, level, keyp, ptrp);
|
|
|
|
node = nilfs_btree_get_nonroot_node(path, level);
|
|
left = nilfs_btree_get_sib_node(path, level);
|
|
ncblk = nilfs_btree_nchildren_per_block(btree);
|
|
|
|
n = nilfs_btree_node_get_nchildren(node);
|
|
|
|
nilfs_btree_node_move_left(left, node, n, ncblk, ncblk);
|
|
|
|
if (!buffer_dirty(path[level].bp_sib_bh))
|
|
mark_buffer_dirty(path[level].bp_sib_bh);
|
|
|
|
nilfs_btnode_delete(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(left);
|
|
}
|
|
|
|
static void nilfs_btree_concat_right(struct nilfs_bmap *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level, __u64 *keyp, __u64 *ptrp)
|
|
{
|
|
struct nilfs_btree_node *node, *right;
|
|
int n, ncblk;
|
|
|
|
nilfs_btree_do_delete(btree, path, level, keyp, ptrp);
|
|
|
|
node = nilfs_btree_get_nonroot_node(path, level);
|
|
right = nilfs_btree_get_sib_node(path, level);
|
|
ncblk = nilfs_btree_nchildren_per_block(btree);
|
|
|
|
n = nilfs_btree_node_get_nchildren(right);
|
|
|
|
nilfs_btree_node_move_left(node, right, n, ncblk, ncblk);
|
|
|
|
if (!buffer_dirty(path[level].bp_bh))
|
|
mark_buffer_dirty(path[level].bp_bh);
|
|
|
|
nilfs_btnode_delete(path[level].bp_sib_bh);
|
|
path[level].bp_sib_bh = NULL;
|
|
path[level + 1].bp_index++;
|
|
}
|
|
|
|
static void nilfs_btree_shrink(struct nilfs_bmap *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level, __u64 *keyp, __u64 *ptrp)
|
|
{
|
|
struct nilfs_btree_node *root, *child;
|
|
int n, ncblk;
|
|
|
|
nilfs_btree_do_delete(btree, path, level, keyp, ptrp);
|
|
|
|
root = nilfs_btree_get_root(btree);
|
|
child = nilfs_btree_get_nonroot_node(path, level);
|
|
ncblk = nilfs_btree_nchildren_per_block(btree);
|
|
|
|
nilfs_btree_node_delete(root, 0, NULL, NULL,
|
|
NILFS_BTREE_ROOT_NCHILDREN_MAX);
|
|
nilfs_btree_node_set_level(root, level);
|
|
n = nilfs_btree_node_get_nchildren(child);
|
|
nilfs_btree_node_move_left(root, child, n,
|
|
NILFS_BTREE_ROOT_NCHILDREN_MAX, ncblk);
|
|
|
|
nilfs_btnode_delete(path[level].bp_bh);
|
|
path[level].bp_bh = NULL;
|
|
}
|
|
|
|
static void nilfs_btree_nop(struct nilfs_bmap *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level, __u64 *keyp, __u64 *ptrp)
|
|
{
|
|
}
|
|
|
|
static int nilfs_btree_prepare_delete(struct nilfs_bmap *btree,
|
|
struct nilfs_btree_path *path,
|
|
int *levelp,
|
|
struct nilfs_bmap_stats *stats,
|
|
struct inode *dat)
|
|
{
|
|
struct buffer_head *bh;
|
|
struct nilfs_btree_node *node, *parent, *sib;
|
|
__u64 sibptr;
|
|
int pindex, dindex, level, ncmin, ncmax, ncblk, ret;
|
|
|
|
ret = 0;
|
|
stats->bs_nblocks = 0;
|
|
ncmin = NILFS_BTREE_NODE_NCHILDREN_MIN(nilfs_btree_node_size(btree));
|
|
ncblk = nilfs_btree_nchildren_per_block(btree);
|
|
|
|
for (level = NILFS_BTREE_LEVEL_NODE_MIN, dindex = path[level].bp_index;
|
|
level < nilfs_btree_height(btree) - 1;
|
|
level++) {
|
|
node = nilfs_btree_get_nonroot_node(path, level);
|
|
path[level].bp_oldreq.bpr_ptr =
|
|
nilfs_btree_node_get_ptr(node, dindex, ncblk);
|
|
ret = nilfs_bmap_prepare_end_ptr(btree,
|
|
&path[level].bp_oldreq, dat);
|
|
if (ret < 0)
|
|
goto err_out_child_node;
|
|
|
|
if (nilfs_btree_node_get_nchildren(node) > ncmin) {
|
|
path[level].bp_op = nilfs_btree_do_delete;
|
|
stats->bs_nblocks++;
|
|
goto out;
|
|
}
|
|
|
|
parent = nilfs_btree_get_node(btree, path, level + 1, &ncmax);
|
|
pindex = path[level + 1].bp_index;
|
|
dindex = pindex;
|
|
|
|
if (pindex > 0) {
|
|
/* left sibling */
|
|
sibptr = nilfs_btree_node_get_ptr(parent, pindex - 1,
|
|
ncmax);
|
|
ret = nilfs_btree_get_block(btree, sibptr, &bh);
|
|
if (ret < 0)
|
|
goto err_out_curr_node;
|
|
sib = (struct nilfs_btree_node *)bh->b_data;
|
|
if (nilfs_btree_node_get_nchildren(sib) > ncmin) {
|
|
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(parent) - 1) {
|
|
/* right sibling */
|
|
sibptr = nilfs_btree_node_get_ptr(parent, pindex + 1,
|
|
ncmax);
|
|
ret = nilfs_btree_get_block(btree, sibptr, &bh);
|
|
if (ret < 0)
|
|
goto err_out_curr_node;
|
|
sib = (struct nilfs_btree_node *)bh->b_data;
|
|
if (nilfs_btree_node_get_nchildren(sib) > ncmin) {
|
|
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++;
|
|
/*
|
|
* When merging right sibling node
|
|
* into the current node, pointer to
|
|
* the right sibling node must be
|
|
* terminated instead. The adjustment
|
|
* below is required for that.
|
|
*/
|
|
dindex = pindex + 1;
|
|
/* 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(node) - 1 <=
|
|
NILFS_BTREE_ROOT_NCHILDREN_MAX) {
|
|
path[level].bp_op = nilfs_btree_shrink;
|
|
stats->bs_nblocks += 2;
|
|
level++;
|
|
path[level].bp_op = nilfs_btree_nop;
|
|
goto shrink_root_child;
|
|
} else {
|
|
path[level].bp_op = nilfs_btree_do_delete;
|
|
stats->bs_nblocks++;
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* child of the root node is deleted */
|
|
path[level].bp_op = nilfs_btree_do_delete;
|
|
stats->bs_nblocks++;
|
|
|
|
shrink_root_child:
|
|
node = nilfs_btree_get_root(btree);
|
|
path[level].bp_oldreq.bpr_ptr =
|
|
nilfs_btree_node_get_ptr(node, dindex,
|
|
NILFS_BTREE_ROOT_NCHILDREN_MAX);
|
|
|
|
ret = nilfs_bmap_prepare_end_ptr(btree, &path[level].bp_oldreq, dat);
|
|
if (ret < 0)
|
|
goto err_out_child_node;
|
|
|
|
/* success */
|
|
out:
|
|
*levelp = level;
|
|
return ret;
|
|
|
|
/* error */
|
|
err_out_curr_node:
|
|
nilfs_bmap_abort_end_ptr(btree, &path[level].bp_oldreq, dat);
|
|
err_out_child_node:
|
|
for (level--; level >= NILFS_BTREE_LEVEL_NODE_MIN; level--) {
|
|
brelse(path[level].bp_sib_bh);
|
|
nilfs_bmap_abort_end_ptr(btree, &path[level].bp_oldreq, dat);
|
|
}
|
|
*levelp = level;
|
|
stats->bs_nblocks = 0;
|
|
return ret;
|
|
}
|
|
|
|
static void nilfs_btree_commit_delete(struct nilfs_bmap *btree,
|
|
struct nilfs_btree_path *path,
|
|
int maxlevel, struct inode *dat)
|
|
{
|
|
int level;
|
|
|
|
for (level = NILFS_BTREE_LEVEL_NODE_MIN; level <= maxlevel; level++) {
|
|
nilfs_bmap_commit_end_ptr(btree, &path[level].bp_oldreq, dat);
|
|
path[level].bp_op(btree, path, level, NULL, NULL);
|
|
}
|
|
|
|
if (!nilfs_bmap_dirty(btree))
|
|
nilfs_bmap_set_dirty(btree);
|
|
}
|
|
|
|
static int nilfs_btree_delete(struct nilfs_bmap *btree, __u64 key)
|
|
|
|
{
|
|
struct nilfs_btree_path *path;
|
|
struct nilfs_bmap_stats stats;
|
|
struct inode *dat;
|
|
int level, ret;
|
|
|
|
path = nilfs_btree_alloc_path();
|
|
if (path == NULL)
|
|
return -ENOMEM;
|
|
|
|
ret = nilfs_btree_do_lookup(btree, path, key, NULL,
|
|
NILFS_BTREE_LEVEL_NODE_MIN, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
|
|
dat = NILFS_BMAP_USE_VBN(btree) ? nilfs_bmap_get_dat(btree) : NULL;
|
|
|
|
ret = nilfs_btree_prepare_delete(btree, path, &level, &stats, dat);
|
|
if (ret < 0)
|
|
goto out;
|
|
nilfs_btree_commit_delete(btree, path, level, dat);
|
|
nilfs_inode_sub_blocks(btree->b_inode, stats.bs_nblocks);
|
|
|
|
out:
|
|
nilfs_btree_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static int nilfs_btree_last_key(const struct nilfs_bmap *btree, __u64 *keyp)
|
|
{
|
|
struct nilfs_btree_path *path;
|
|
int ret;
|
|
|
|
path = nilfs_btree_alloc_path();
|
|
if (path == NULL)
|
|
return -ENOMEM;
|
|
|
|
ret = nilfs_btree_do_lookup_last(btree, path, keyp, NULL);
|
|
|
|
nilfs_btree_free_path(path);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int nilfs_btree_check_delete(struct nilfs_bmap *btree, __u64 key)
|
|
{
|
|
struct buffer_head *bh;
|
|
struct nilfs_btree_node *root, *node;
|
|
__u64 maxkey, nextmaxkey;
|
|
__u64 ptr;
|
|
int nchildren, ret;
|
|
|
|
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(root);
|
|
if (nchildren > 1)
|
|
return 0;
|
|
ptr = nilfs_btree_node_get_ptr(root, nchildren - 1,
|
|
NILFS_BTREE_ROOT_NCHILDREN_MAX);
|
|
ret = nilfs_btree_get_block(btree, 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(node);
|
|
maxkey = nilfs_btree_node_get_key(node, nchildren - 1);
|
|
nextmaxkey = (nchildren > 1) ?
|
|
nilfs_btree_node_get_key(node, nchildren - 2) : 0;
|
|
if (bh != NULL)
|
|
brelse(bh);
|
|
|
|
return (maxkey == key) && (nextmaxkey < NILFS_BMAP_LARGE_LOW);
|
|
}
|
|
|
|
static int nilfs_btree_gather_data(struct nilfs_bmap *btree,
|
|
__u64 *keys, __u64 *ptrs, int nitems)
|
|
{
|
|
struct buffer_head *bh;
|
|
struct nilfs_btree_node *node, *root;
|
|
__le64 *dkeys;
|
|
__le64 *dptrs;
|
|
__u64 ptr;
|
|
int nchildren, ncmax, i, ret;
|
|
|
|
root = nilfs_btree_get_root(btree);
|
|
switch (nilfs_btree_height(btree)) {
|
|
case 2:
|
|
bh = NULL;
|
|
node = root;
|
|
ncmax = NILFS_BTREE_ROOT_NCHILDREN_MAX;
|
|
break;
|
|
case 3:
|
|
nchildren = nilfs_btree_node_get_nchildren(root);
|
|
WARN_ON(nchildren > 1);
|
|
ptr = nilfs_btree_node_get_ptr(root, nchildren - 1,
|
|
NILFS_BTREE_ROOT_NCHILDREN_MAX);
|
|
ret = nilfs_btree_get_block(btree, ptr, &bh);
|
|
if (ret < 0)
|
|
return ret;
|
|
node = (struct nilfs_btree_node *)bh->b_data;
|
|
ncmax = nilfs_btree_nchildren_per_block(btree);
|
|
break;
|
|
default:
|
|
node = NULL;
|
|
return -EINVAL;
|
|
}
|
|
|
|
nchildren = nilfs_btree_node_get_nchildren(node);
|
|
if (nchildren < nitems)
|
|
nitems = nchildren;
|
|
dkeys = nilfs_btree_node_dkeys(node);
|
|
dptrs = nilfs_btree_node_dptrs(node, ncmax);
|
|
for (i = 0; i < nitems; i++) {
|
|
keys[i] = le64_to_cpu(dkeys[i]);
|
|
ptrs[i] = le64_to_cpu(dptrs[i]);
|
|
}
|
|
|
|
if (bh != NULL)
|
|
brelse(bh);
|
|
|
|
return nitems;
|
|
}
|
|
|
|
static int
|
|
nilfs_btree_prepare_convert_and_insert(struct nilfs_bmap *btree, __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 inode *dat = NULL;
|
|
int ret;
|
|
|
|
stats->bs_nblocks = 0;
|
|
|
|
/* for data */
|
|
/* cannot find near ptr */
|
|
if (NILFS_BMAP_USE_VBN(btree)) {
|
|
dreq->bpr_ptr = nilfs_btree_find_target_v(btree, NULL, key);
|
|
dat = nilfs_bmap_get_dat(btree);
|
|
}
|
|
|
|
ret = nilfs_bmap_prepare_alloc_ptr(btree, dreq, dat);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
*bhp = NULL;
|
|
stats->bs_nblocks++;
|
|
if (nreq != NULL) {
|
|
nreq->bpr_ptr = dreq->bpr_ptr + 1;
|
|
ret = nilfs_bmap_prepare_alloc_ptr(btree, nreq, dat);
|
|
if (ret < 0)
|
|
goto err_out_dreq;
|
|
|
|
ret = nilfs_btree_get_new_block(btree, nreq->bpr_ptr, &bh);
|
|
if (ret < 0)
|
|
goto err_out_nreq;
|
|
|
|
*bhp = bh;
|
|
stats->bs_nblocks++;
|
|
}
|
|
|
|
/* success */
|
|
return 0;
|
|
|
|
/* error */
|
|
err_out_nreq:
|
|
nilfs_bmap_abort_alloc_ptr(btree, nreq, dat);
|
|
err_out_dreq:
|
|
nilfs_bmap_abort_alloc_ptr(btree, dreq, dat);
|
|
stats->bs_nblocks = 0;
|
|
return ret;
|
|
|
|
}
|
|
|
|
static void
|
|
nilfs_btree_commit_convert_and_insert(struct nilfs_bmap *btree,
|
|
__u64 key, __u64 ptr,
|
|
const __u64 *keys, const __u64 *ptrs,
|
|
int n,
|
|
union nilfs_bmap_ptr_req *dreq,
|
|
union nilfs_bmap_ptr_req *nreq,
|
|
struct buffer_head *bh)
|
|
{
|
|
struct nilfs_btree_node *node;
|
|
struct inode *dat;
|
|
__u64 tmpptr;
|
|
int ncblk;
|
|
|
|
/* free resources */
|
|
if (btree->b_ops->bop_clear != NULL)
|
|
btree->b_ops->bop_clear(btree);
|
|
|
|
/* ptr must be a pointer to a buffer head. */
|
|
set_buffer_nilfs_volatile((struct buffer_head *)((unsigned long)ptr));
|
|
|
|
/* convert and insert */
|
|
dat = NILFS_BMAP_USE_VBN(btree) ? nilfs_bmap_get_dat(btree) : NULL;
|
|
__nilfs_btree_init(btree);
|
|
if (nreq != NULL) {
|
|
nilfs_bmap_commit_alloc_ptr(btree, dreq, dat);
|
|
nilfs_bmap_commit_alloc_ptr(btree, nreq, dat);
|
|
|
|
/* create child node at level 1 */
|
|
node = (struct nilfs_btree_node *)bh->b_data;
|
|
ncblk = nilfs_btree_nchildren_per_block(btree);
|
|
nilfs_btree_node_init(node, 0, 1, n, ncblk, keys, ptrs);
|
|
nilfs_btree_node_insert(node, n, key, dreq->bpr_ptr, ncblk);
|
|
if (!buffer_dirty(bh))
|
|
mark_buffer_dirty(bh);
|
|
if (!nilfs_bmap_dirty(btree))
|
|
nilfs_bmap_set_dirty(btree);
|
|
|
|
brelse(bh);
|
|
|
|
/* create root node at level 2 */
|
|
node = nilfs_btree_get_root(btree);
|
|
tmpptr = nreq->bpr_ptr;
|
|
nilfs_btree_node_init(node, NILFS_BTREE_NODE_ROOT, 2, 1,
|
|
NILFS_BTREE_ROOT_NCHILDREN_MAX,
|
|
&keys[0], &tmpptr);
|
|
} else {
|
|
nilfs_bmap_commit_alloc_ptr(btree, dreq, dat);
|
|
|
|
/* create root node at level 1 */
|
|
node = nilfs_btree_get_root(btree);
|
|
nilfs_btree_node_init(node, NILFS_BTREE_NODE_ROOT, 1, n,
|
|
NILFS_BTREE_ROOT_NCHILDREN_MAX,
|
|
keys, ptrs);
|
|
nilfs_btree_node_insert(node, n, key, dreq->bpr_ptr,
|
|
NILFS_BTREE_ROOT_NCHILDREN_MAX);
|
|
if (!nilfs_bmap_dirty(btree))
|
|
nilfs_bmap_set_dirty(btree);
|
|
}
|
|
|
|
if (NILFS_BMAP_USE_VBN(btree))
|
|
nilfs_bmap_set_target_v(btree, key, dreq->bpr_ptr);
|
|
}
|
|
|
|
/**
|
|
* nilfs_btree_convert_and_insert -
|
|
* @bmap:
|
|
* @key:
|
|
* @ptr:
|
|
* @keys:
|
|
* @ptrs:
|
|
* @n:
|
|
*/
|
|
int nilfs_btree_convert_and_insert(struct nilfs_bmap *btree,
|
|
__u64 key, __u64 ptr,
|
|
const __u64 *keys, const __u64 *ptrs, int n)
|
|
{
|
|
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 << btree->b_inode->i_blkbits)) {
|
|
di = &dreq;
|
|
ni = &nreq;
|
|
} else {
|
|
di = NULL;
|
|
ni = NULL;
|
|
BUG();
|
|
}
|
|
|
|
ret = nilfs_btree_prepare_convert_and_insert(btree, key, di, ni, &bh,
|
|
&stats);
|
|
if (ret < 0)
|
|
return ret;
|
|
nilfs_btree_commit_convert_and_insert(btree, key, ptr, keys, ptrs, n,
|
|
di, ni, bh);
|
|
nilfs_inode_add_blocks(btree->b_inode, stats.bs_nblocks);
|
|
return 0;
|
|
}
|
|
|
|
static int nilfs_btree_propagate_p(struct nilfs_bmap *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))
|
|
mark_buffer_dirty(path[level].bp_bh);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nilfs_btree_prepare_update_v(struct nilfs_bmap *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level, struct inode *dat)
|
|
{
|
|
struct nilfs_btree_node *parent;
|
|
int ncmax, ret;
|
|
|
|
parent = nilfs_btree_get_node(btree, path, level + 1, &ncmax);
|
|
path[level].bp_oldreq.bpr_ptr =
|
|
nilfs_btree_node_get_ptr(parent, path[level + 1].bp_index,
|
|
ncmax);
|
|
path[level].bp_newreq.bpr_ptr = path[level].bp_oldreq.bpr_ptr + 1;
|
|
ret = nilfs_dat_prepare_update(dat, &path[level].bp_oldreq.bpr_req,
|
|
&path[level].bp_newreq.bpr_req);
|
|
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)->i_btnode_cache,
|
|
&path[level].bp_ctxt);
|
|
if (ret < 0) {
|
|
nilfs_dat_abort_update(dat,
|
|
&path[level].bp_oldreq.bpr_req,
|
|
&path[level].bp_newreq.bpr_req);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void nilfs_btree_commit_update_v(struct nilfs_bmap *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level, struct inode *dat)
|
|
{
|
|
struct nilfs_btree_node *parent;
|
|
int ncmax;
|
|
|
|
nilfs_dat_commit_update(dat, &path[level].bp_oldreq.bpr_req,
|
|
&path[level].bp_newreq.bpr_req,
|
|
btree->b_ptr_type == NILFS_BMAP_PTR_VS);
|
|
|
|
if (buffer_nilfs_node(path[level].bp_bh)) {
|
|
nilfs_btnode_commit_change_key(
|
|
&NILFS_BMAP_I(btree)->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, &ncmax);
|
|
nilfs_btree_node_set_ptr(parent, path[level + 1].bp_index,
|
|
path[level].bp_newreq.bpr_ptr, ncmax);
|
|
}
|
|
|
|
static void nilfs_btree_abort_update_v(struct nilfs_bmap *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level, struct inode *dat)
|
|
{
|
|
nilfs_dat_abort_update(dat, &path[level].bp_oldreq.bpr_req,
|
|
&path[level].bp_newreq.bpr_req);
|
|
if (buffer_nilfs_node(path[level].bp_bh))
|
|
nilfs_btnode_abort_change_key(
|
|
&NILFS_BMAP_I(btree)->i_btnode_cache,
|
|
&path[level].bp_ctxt);
|
|
}
|
|
|
|
static int nilfs_btree_prepare_propagate_v(struct nilfs_bmap *btree,
|
|
struct nilfs_btree_path *path,
|
|
int minlevel, int *maxlevelp,
|
|
struct inode *dat)
|
|
{
|
|
int level, ret;
|
|
|
|
level = minlevel;
|
|
if (!buffer_nilfs_volatile(path[level].bp_bh)) {
|
|
ret = nilfs_btree_prepare_update_v(btree, path, level, dat);
|
|
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, dat);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
|
|
/* success */
|
|
*maxlevelp = level - 1;
|
|
return 0;
|
|
|
|
/* error */
|
|
out:
|
|
while (--level > minlevel)
|
|
nilfs_btree_abort_update_v(btree, path, level, dat);
|
|
if (!buffer_nilfs_volatile(path[level].bp_bh))
|
|
nilfs_btree_abort_update_v(btree, path, level, dat);
|
|
return ret;
|
|
}
|
|
|
|
static void nilfs_btree_commit_propagate_v(struct nilfs_bmap *btree,
|
|
struct nilfs_btree_path *path,
|
|
int minlevel, int maxlevel,
|
|
struct buffer_head *bh,
|
|
struct inode *dat)
|
|
{
|
|
int level;
|
|
|
|
if (!buffer_nilfs_volatile(path[minlevel].bp_bh))
|
|
nilfs_btree_commit_update_v(btree, path, minlevel, dat);
|
|
|
|
for (level = minlevel + 1; level <= maxlevel; level++)
|
|
nilfs_btree_commit_update_v(btree, path, level, dat);
|
|
}
|
|
|
|
static int nilfs_btree_propagate_v(struct nilfs_bmap *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level, struct buffer_head *bh)
|
|
{
|
|
int maxlevel = 0, ret;
|
|
struct nilfs_btree_node *parent;
|
|
struct inode *dat = nilfs_bmap_get_dat(btree);
|
|
__u64 ptr;
|
|
int ncmax;
|
|
|
|
get_bh(bh);
|
|
path[level].bp_bh = bh;
|
|
ret = nilfs_btree_prepare_propagate_v(btree, path, level, &maxlevel,
|
|
dat);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
if (buffer_nilfs_volatile(path[level].bp_bh)) {
|
|
parent = nilfs_btree_get_node(btree, path, level + 1, &ncmax);
|
|
ptr = nilfs_btree_node_get_ptr(parent,
|
|
path[level + 1].bp_index,
|
|
ncmax);
|
|
ret = nilfs_dat_mark_dirty(dat, ptr);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
|
|
nilfs_btree_commit_propagate_v(btree, path, level, maxlevel, bh, dat);
|
|
|
|
out:
|
|
brelse(path[level].bp_bh);
|
|
path[level].bp_bh = NULL;
|
|
return ret;
|
|
}
|
|
|
|
static int nilfs_btree_propagate(struct nilfs_bmap *btree,
|
|
struct buffer_head *bh)
|
|
{
|
|
struct nilfs_btree_path *path;
|
|
struct nilfs_btree_node *node;
|
|
__u64 key;
|
|
int level, ret;
|
|
|
|
WARN_ON(!buffer_dirty(bh));
|
|
|
|
path = nilfs_btree_alloc_path();
|
|
if (path == NULL)
|
|
return -ENOMEM;
|
|
|
|
if (buffer_nilfs_node(bh)) {
|
|
node = (struct nilfs_btree_node *)bh->b_data;
|
|
key = nilfs_btree_node_get_key(node, 0);
|
|
level = nilfs_btree_node_get_level(node);
|
|
} else {
|
|
key = nilfs_bmap_data_get_key(btree, bh);
|
|
level = NILFS_BTREE_LEVEL_DATA;
|
|
}
|
|
|
|
ret = nilfs_btree_do_lookup(btree, path, key, NULL, level + 1, 0);
|
|
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 = NILFS_BMAP_USE_VBN(btree) ?
|
|
nilfs_btree_propagate_v(btree, path, level, bh) :
|
|
nilfs_btree_propagate_p(btree, path, level, bh);
|
|
|
|
out:
|
|
nilfs_btree_free_path(path);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int nilfs_btree_propagate_gc(struct nilfs_bmap *btree,
|
|
struct buffer_head *bh)
|
|
{
|
|
return nilfs_dat_mark_dirty(nilfs_bmap_get_dat(btree), bh->b_blocknr);
|
|
}
|
|
|
|
static void nilfs_btree_add_dirty_buffer(struct nilfs_bmap *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(node, 0);
|
|
level = nilfs_btree_node_get_level(node);
|
|
if (level < NILFS_BTREE_LEVEL_NODE_MIN ||
|
|
level >= NILFS_BTREE_LEVEL_MAX) {
|
|
dump_stack();
|
|
printk(KERN_WARNING
|
|
"%s: invalid btree level: %d (key=%llu, ino=%lu, "
|
|
"blocknr=%llu)\n",
|
|
__func__, level, (unsigned long long)key,
|
|
NILFS_BMAP_I(btree)->vfs_inode.i_ino,
|
|
(unsigned long long)bh->b_blocknr);
|
|
return;
|
|
}
|
|
|
|
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(cnode, 0);
|
|
if (key < ckey)
|
|
break;
|
|
}
|
|
list_add_tail(&bh->b_assoc_buffers, head);
|
|
}
|
|
|
|
static void nilfs_btree_lookup_dirty_buffers(struct nilfs_bmap *btree,
|
|
struct list_head *listp)
|
|
{
|
|
struct address_space *btcache = &NILFS_BMAP_I(btree)->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_tail(&lists[level], listp);
|
|
}
|
|
|
|
static int nilfs_btree_assign_p(struct nilfs_bmap *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 ncmax, ret;
|
|
|
|
parent = nilfs_btree_get_node(btree, path, level + 1, &ncmax);
|
|
ptr = nilfs_btree_node_get_ptr(parent, path[level + 1].bp_index,
|
|
ncmax);
|
|
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)->i_btnode_cache,
|
|
&path[level].bp_ctxt);
|
|
if (ret < 0)
|
|
return ret;
|
|
nilfs_btnode_commit_change_key(
|
|
&NILFS_BMAP_I(btree)->i_btnode_cache,
|
|
&path[level].bp_ctxt);
|
|
*bh = path[level].bp_ctxt.bh;
|
|
}
|
|
|
|
nilfs_btree_node_set_ptr(parent, path[level + 1].bp_index, blocknr,
|
|
ncmax);
|
|
|
|
key = nilfs_btree_node_get_key(parent, path[level + 1].bp_index);
|
|
/* on-disk format */
|
|
binfo->bi_dat.bi_blkoff = cpu_to_le64(key);
|
|
binfo->bi_dat.bi_level = level;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nilfs_btree_assign_v(struct nilfs_bmap *btree,
|
|
struct nilfs_btree_path *path,
|
|
int level,
|
|
struct buffer_head **bh,
|
|
sector_t blocknr,
|
|
union nilfs_binfo *binfo)
|
|
{
|
|
struct nilfs_btree_node *parent;
|
|
struct inode *dat = nilfs_bmap_get_dat(btree);
|
|
__u64 key;
|
|
__u64 ptr;
|
|
union nilfs_bmap_ptr_req req;
|
|
int ncmax, ret;
|
|
|
|
parent = nilfs_btree_get_node(btree, path, level + 1, &ncmax);
|
|
ptr = nilfs_btree_node_get_ptr(parent, path[level + 1].bp_index,
|
|
ncmax);
|
|
req.bpr_ptr = ptr;
|
|
ret = nilfs_dat_prepare_start(dat, &req.bpr_req);
|
|
if (ret < 0)
|
|
return ret;
|
|
nilfs_dat_commit_start(dat, &req.bpr_req, blocknr);
|
|
|
|
key = nilfs_btree_node_get_key(parent, path[level + 1].bp_index);
|
|
/* on-disk format */
|
|
binfo->bi_v.bi_vblocknr = cpu_to_le64(ptr);
|
|
binfo->bi_v.bi_blkoff = cpu_to_le64(key);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nilfs_btree_assign(struct nilfs_bmap *btree,
|
|
struct buffer_head **bh,
|
|
sector_t blocknr,
|
|
union nilfs_binfo *binfo)
|
|
{
|
|
struct nilfs_btree_path *path;
|
|
struct nilfs_btree_node *node;
|
|
__u64 key;
|
|
int level, ret;
|
|
|
|
path = nilfs_btree_alloc_path();
|
|
if (path == NULL)
|
|
return -ENOMEM;
|
|
|
|
if (buffer_nilfs_node(*bh)) {
|
|
node = (struct nilfs_btree_node *)(*bh)->b_data;
|
|
key = nilfs_btree_node_get_key(node, 0);
|
|
level = nilfs_btree_node_get_level(node);
|
|
} else {
|
|
key = nilfs_bmap_data_get_key(btree, *bh);
|
|
level = NILFS_BTREE_LEVEL_DATA;
|
|
}
|
|
|
|
ret = nilfs_btree_do_lookup(btree, path, key, NULL, level + 1, 0);
|
|
if (ret < 0) {
|
|
WARN_ON(ret == -ENOENT);
|
|
goto out;
|
|
}
|
|
|
|
ret = NILFS_BMAP_USE_VBN(btree) ?
|
|
nilfs_btree_assign_v(btree, path, level, bh, blocknr, binfo) :
|
|
nilfs_btree_assign_p(btree, path, level, bh, blocknr, binfo);
|
|
|
|
out:
|
|
nilfs_btree_free_path(path);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int nilfs_btree_assign_gc(struct nilfs_bmap *btree,
|
|
struct buffer_head **bh,
|
|
sector_t blocknr,
|
|
union nilfs_binfo *binfo)
|
|
{
|
|
struct nilfs_btree_node *node;
|
|
__u64 key;
|
|
int ret;
|
|
|
|
ret = nilfs_dat_move(nilfs_bmap_get_dat(btree), (*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(node, 0);
|
|
} else
|
|
key = nilfs_bmap_data_get_key(btree, *bh);
|
|
|
|
/* on-disk format */
|
|
binfo->bi_v.bi_vblocknr = cpu_to_le64((*bh)->b_blocknr);
|
|
binfo->bi_v.bi_blkoff = cpu_to_le64(key);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nilfs_btree_mark(struct nilfs_bmap *btree, __u64 key, int level)
|
|
{
|
|
struct buffer_head *bh;
|
|
struct nilfs_btree_path *path;
|
|
__u64 ptr;
|
|
int ret;
|
|
|
|
path = nilfs_btree_alloc_path();
|
|
if (path == NULL)
|
|
return -ENOMEM;
|
|
|
|
ret = nilfs_btree_do_lookup(btree, path, key, &ptr, level + 1, 0);
|
|
if (ret < 0) {
|
|
WARN_ON(ret == -ENOENT);
|
|
goto out;
|
|
}
|
|
ret = nilfs_btree_get_block(btree, ptr, &bh);
|
|
if (ret < 0) {
|
|
WARN_ON(ret == -ENOENT);
|
|
goto out;
|
|
}
|
|
|
|
if (!buffer_dirty(bh))
|
|
mark_buffer_dirty(bh);
|
|
brelse(bh);
|
|
if (!nilfs_bmap_dirty(btree))
|
|
nilfs_bmap_set_dirty(btree);
|
|
|
|
out:
|
|
nilfs_btree_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static const struct nilfs_bmap_operations nilfs_btree_ops = {
|
|
.bop_lookup = nilfs_btree_lookup,
|
|
.bop_lookup_contig = nilfs_btree_lookup_contig,
|
|
.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_lookup_contig = 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 void __nilfs_btree_init(struct nilfs_bmap *bmap)
|
|
{
|
|
bmap->b_ops = &nilfs_btree_ops;
|
|
bmap->b_nchildren_per_block =
|
|
NILFS_BTREE_NODE_NCHILDREN_MAX(nilfs_btree_node_size(bmap));
|
|
}
|
|
|
|
int nilfs_btree_init(struct nilfs_bmap *bmap)
|
|
{
|
|
int ret = 0;
|
|
|
|
__nilfs_btree_init(bmap);
|
|
|
|
if (nilfs_btree_root_broken(nilfs_btree_get_root(bmap),
|
|
bmap->b_inode->i_ino))
|
|
ret = -EIO;
|
|
return ret;
|
|
}
|
|
|
|
void nilfs_btree_init_gc(struct nilfs_bmap *bmap)
|
|
{
|
|
bmap->b_ops = &nilfs_btree_ops_gc;
|
|
bmap->b_nchildren_per_block =
|
|
NILFS_BTREE_NODE_NCHILDREN_MAX(nilfs_btree_node_size(bmap));
|
|
}
|