Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1 | /* |
| 2 | * btree.c - NILFS B-tree. |
| 3 | * |
| 4 | * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | * |
| 20 | * Written by Koji Sato <koji@osrg.net>. |
| 21 | */ |
| 22 | |
| 23 | #include <linux/slab.h> |
| 24 | #include <linux/string.h> |
| 25 | #include <linux/errno.h> |
| 26 | #include <linux/pagevec.h> |
| 27 | #include "nilfs.h" |
| 28 | #include "page.h" |
| 29 | #include "btnode.h" |
| 30 | #include "btree.h" |
| 31 | #include "alloc.h" |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 32 | #include "dat.h" |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 33 | |
Li Hong | f905440 | 2010-04-02 17:36:34 +0800 | [diff] [blame] | 34 | static struct nilfs_btree_path *nilfs_btree_alloc_path(void) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 35 | { |
Li Hong | f905440 | 2010-04-02 17:36:34 +0800 | [diff] [blame] | 36 | struct nilfs_btree_path *path; |
| 37 | int level = NILFS_BTREE_LEVEL_DATA; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 38 | |
Li Hong | f905440 | 2010-04-02 17:36:34 +0800 | [diff] [blame] | 39 | path = kmem_cache_alloc(nilfs_btree_path_cache, GFP_NOFS); |
| 40 | if (path == NULL) |
| 41 | goto out; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 42 | |
Li Hong | f905440 | 2010-04-02 17:36:34 +0800 | [diff] [blame] | 43 | for (; level < NILFS_BTREE_LEVEL_MAX; level++) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 44 | path[level].bp_bh = NULL; |
| 45 | path[level].bp_sib_bh = NULL; |
| 46 | path[level].bp_index = 0; |
| 47 | path[level].bp_oldreq.bpr_ptr = NILFS_BMAP_INVALID_PTR; |
| 48 | path[level].bp_newreq.bpr_ptr = NILFS_BMAP_INVALID_PTR; |
| 49 | path[level].bp_op = NULL; |
| 50 | } |
Li Hong | f905440 | 2010-04-02 17:36:34 +0800 | [diff] [blame] | 51 | |
| 52 | out: |
| 53 | return path; |
| 54 | } |
| 55 | |
Li Hong | 73bb488 | 2010-04-02 18:35:00 +0800 | [diff] [blame] | 56 | static void nilfs_btree_free_path(struct nilfs_btree_path *path) |
Li Hong | f905440 | 2010-04-02 17:36:34 +0800 | [diff] [blame] | 57 | { |
Li Hong | 73bb488 | 2010-04-02 18:35:00 +0800 | [diff] [blame] | 58 | int level = NILFS_BTREE_LEVEL_DATA; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 59 | |
Li Hong | 73bb488 | 2010-04-02 18:35:00 +0800 | [diff] [blame] | 60 | for (; level < NILFS_BTREE_LEVEL_MAX; level++) |
Ryusuke Konishi | 3218929 | 2009-08-15 01:54:59 +0900 | [diff] [blame] | 61 | brelse(path[level].bp_bh); |
Li Hong | 73bb488 | 2010-04-02 18:35:00 +0800 | [diff] [blame] | 62 | |
| 63 | kmem_cache_free(nilfs_btree_path_cache, path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 64 | } |
| 65 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 66 | /* |
| 67 | * B-tree node operations |
| 68 | */ |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 69 | static int nilfs_btree_get_block(const struct nilfs_bmap *btree, __u64 ptr, |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 70 | struct buffer_head **bhp) |
| 71 | { |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 72 | struct address_space *btnc = &NILFS_BMAP_I(btree)->i_btnode_cache; |
Ryusuke Konishi | 1d5385b | 2010-07-16 23:52:40 +0900 | [diff] [blame] | 73 | struct buffer_head *bh; |
Ryusuke Konishi | 1376e93 | 2009-11-13 16:49:09 +0900 | [diff] [blame] | 74 | int err; |
| 75 | |
| 76 | err = nilfs_btnode_submit_block(btnc, ptr, 0, bhp); |
| 77 | if (err) |
| 78 | return err == -EEXIST ? 0 : err; |
| 79 | |
Ryusuke Konishi | 1d5385b | 2010-07-16 23:52:40 +0900 | [diff] [blame] | 80 | bh = *bhp; |
| 81 | wait_on_buffer(bh); |
| 82 | if (!buffer_uptodate(bh)) { |
| 83 | brelse(bh); |
Ryusuke Konishi | 1376e93 | 2009-11-13 16:49:09 +0900 | [diff] [blame] | 84 | return -EIO; |
| 85 | } |
Ryusuke Konishi | 1d5385b | 2010-07-16 23:52:40 +0900 | [diff] [blame] | 86 | if (nilfs_btree_broken_node_block(bh)) { |
| 87 | clear_buffer_uptodate(bh); |
| 88 | brelse(bh); |
| 89 | return -EINVAL; |
| 90 | } |
Ryusuke Konishi | 1376e93 | 2009-11-13 16:49:09 +0900 | [diff] [blame] | 91 | return 0; |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 92 | } |
| 93 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 94 | static int nilfs_btree_get_new_block(const struct nilfs_bmap *btree, |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 95 | __u64 ptr, struct buffer_head **bhp) |
| 96 | { |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 97 | struct address_space *btnc = &NILFS_BMAP_I(btree)->i_btnode_cache; |
Ryusuke Konishi | 45f4910 | 2009-11-13 16:25:19 +0900 | [diff] [blame] | 98 | struct buffer_head *bh; |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 99 | |
Ryusuke Konishi | 45f4910 | 2009-11-13 16:25:19 +0900 | [diff] [blame] | 100 | bh = nilfs_btnode_create_block(btnc, ptr); |
| 101 | if (!bh) |
| 102 | return -ENOMEM; |
| 103 | |
| 104 | set_buffer_nilfs_volatile(bh); |
| 105 | *bhp = bh; |
| 106 | return 0; |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 107 | } |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 108 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame^] | 109 | static int nilfs_btree_node_get_flags(const struct nilfs_btree_node *node) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 110 | { |
| 111 | return node->bn_flags; |
| 112 | } |
| 113 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame^] | 114 | static void |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 115 | nilfs_btree_node_set_flags(struct nilfs_btree_node *node, int flags) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 116 | { |
| 117 | node->bn_flags = flags; |
| 118 | } |
| 119 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame^] | 120 | static int nilfs_btree_node_root(const struct nilfs_btree_node *node) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 121 | { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 122 | return nilfs_btree_node_get_flags(node) & NILFS_BTREE_NODE_ROOT; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 123 | } |
| 124 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame^] | 125 | static int nilfs_btree_node_get_level(const struct nilfs_btree_node *node) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 126 | { |
| 127 | return node->bn_level; |
| 128 | } |
| 129 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame^] | 130 | static void |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 131 | nilfs_btree_node_set_level(struct nilfs_btree_node *node, int level) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 132 | { |
| 133 | node->bn_level = level; |
| 134 | } |
| 135 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame^] | 136 | static int nilfs_btree_node_get_nchildren(const struct nilfs_btree_node *node) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 137 | { |
| 138 | return le16_to_cpu(node->bn_nchildren); |
| 139 | } |
| 140 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame^] | 141 | static void |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 142 | nilfs_btree_node_set_nchildren(struct nilfs_btree_node *node, int nchildren) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 143 | { |
| 144 | node->bn_nchildren = cpu_to_le16(nchildren); |
| 145 | } |
| 146 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame^] | 147 | static int nilfs_btree_node_size(const struct nilfs_bmap *btree) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 148 | { |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 149 | return 1 << btree->b_inode->i_blkbits; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 150 | } |
| 151 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 152 | static int nilfs_btree_nchildren_per_block(const struct nilfs_bmap *btree) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 153 | { |
Ryusuke Konishi | 5ad2686e9 | 2010-07-13 23:33:54 +0900 | [diff] [blame] | 154 | return btree->b_nchildren_per_block; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 155 | } |
| 156 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame^] | 157 | static __le64 * |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 158 | nilfs_btree_node_dkeys(const struct nilfs_btree_node *node) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 159 | { |
| 160 | return (__le64 *)((char *)(node + 1) + |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 161 | (nilfs_btree_node_root(node) ? |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 162 | 0 : NILFS_BTREE_NODE_EXTRA_PAD_SIZE)); |
| 163 | } |
| 164 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame^] | 165 | static __le64 * |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 166 | nilfs_btree_node_dptrs(const struct nilfs_btree_node *node, int ncmax) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 167 | { |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 168 | return (__le64 *)(nilfs_btree_node_dkeys(node) + ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 169 | } |
| 170 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame^] | 171 | static __u64 |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 172 | nilfs_btree_node_get_key(const struct nilfs_btree_node *node, int index) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 173 | { |
Ryusuke Konishi | 25b8d7d | 2010-07-10 16:50:41 +0900 | [diff] [blame] | 174 | return le64_to_cpu(*(nilfs_btree_node_dkeys(node) + index)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 175 | } |
| 176 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame^] | 177 | static void |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 178 | nilfs_btree_node_set_key(struct nilfs_btree_node *node, int index, __u64 key) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 179 | { |
Ryusuke Konishi | 25b8d7d | 2010-07-10 16:50:41 +0900 | [diff] [blame] | 180 | *(nilfs_btree_node_dkeys(node) + index) = cpu_to_le64(key); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 181 | } |
| 182 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame^] | 183 | static __u64 |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 184 | nilfs_btree_node_get_ptr(const struct nilfs_btree_node *node, int index, |
| 185 | int ncmax) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 186 | { |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 187 | return le64_to_cpu(*(nilfs_btree_node_dptrs(node, ncmax) + index)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 188 | } |
| 189 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame^] | 190 | static void |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 191 | nilfs_btree_node_set_ptr(struct nilfs_btree_node *node, int index, __u64 ptr, |
| 192 | int ncmax) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 193 | { |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 194 | *(nilfs_btree_node_dptrs(node, ncmax) + index) = cpu_to_le64(ptr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 195 | } |
| 196 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 197 | static void nilfs_btree_node_init(struct nilfs_btree_node *node, int flags, |
| 198 | int level, int nchildren, int ncmax, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 199 | const __u64 *keys, const __u64 *ptrs) |
| 200 | { |
| 201 | __le64 *dkeys; |
| 202 | __le64 *dptrs; |
| 203 | int i; |
| 204 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 205 | nilfs_btree_node_set_flags(node, flags); |
| 206 | nilfs_btree_node_set_level(node, level); |
| 207 | nilfs_btree_node_set_nchildren(node, nchildren); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 208 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 209 | dkeys = nilfs_btree_node_dkeys(node); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 210 | dptrs = nilfs_btree_node_dptrs(node, ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 211 | for (i = 0; i < nchildren; i++) { |
Ryusuke Konishi | 25b8d7d | 2010-07-10 16:50:41 +0900 | [diff] [blame] | 212 | dkeys[i] = cpu_to_le64(keys[i]); |
| 213 | dptrs[i] = cpu_to_le64(ptrs[i]); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 214 | } |
| 215 | } |
| 216 | |
| 217 | /* Assume the buffer heads corresponding to left and right are locked. */ |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 218 | static void nilfs_btree_node_move_left(struct nilfs_btree_node *left, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 219 | struct nilfs_btree_node *right, |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 220 | int n, int lncmax, int rncmax) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 221 | { |
| 222 | __le64 *ldkeys, *rdkeys; |
| 223 | __le64 *ldptrs, *rdptrs; |
| 224 | int lnchildren, rnchildren; |
| 225 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 226 | ldkeys = nilfs_btree_node_dkeys(left); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 227 | ldptrs = nilfs_btree_node_dptrs(left, lncmax); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 228 | lnchildren = nilfs_btree_node_get_nchildren(left); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 229 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 230 | rdkeys = nilfs_btree_node_dkeys(right); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 231 | rdptrs = nilfs_btree_node_dptrs(right, rncmax); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 232 | rnchildren = nilfs_btree_node_get_nchildren(right); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 233 | |
| 234 | memcpy(ldkeys + lnchildren, rdkeys, n * sizeof(*rdkeys)); |
| 235 | memcpy(ldptrs + lnchildren, rdptrs, n * sizeof(*rdptrs)); |
| 236 | memmove(rdkeys, rdkeys + n, (rnchildren - n) * sizeof(*rdkeys)); |
| 237 | memmove(rdptrs, rdptrs + n, (rnchildren - n) * sizeof(*rdptrs)); |
| 238 | |
| 239 | lnchildren += n; |
| 240 | rnchildren -= n; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 241 | nilfs_btree_node_set_nchildren(left, lnchildren); |
| 242 | nilfs_btree_node_set_nchildren(right, rnchildren); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 243 | } |
| 244 | |
| 245 | /* Assume that the buffer heads corresponding to left and right are locked. */ |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 246 | static void nilfs_btree_node_move_right(struct nilfs_btree_node *left, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 247 | struct nilfs_btree_node *right, |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 248 | int n, int lncmax, int rncmax) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 249 | { |
| 250 | __le64 *ldkeys, *rdkeys; |
| 251 | __le64 *ldptrs, *rdptrs; |
| 252 | int lnchildren, rnchildren; |
| 253 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 254 | ldkeys = nilfs_btree_node_dkeys(left); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 255 | ldptrs = nilfs_btree_node_dptrs(left, lncmax); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 256 | lnchildren = nilfs_btree_node_get_nchildren(left); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 257 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 258 | rdkeys = nilfs_btree_node_dkeys(right); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 259 | rdptrs = nilfs_btree_node_dptrs(right, rncmax); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 260 | rnchildren = nilfs_btree_node_get_nchildren(right); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 261 | |
| 262 | memmove(rdkeys + n, rdkeys, rnchildren * sizeof(*rdkeys)); |
| 263 | memmove(rdptrs + n, rdptrs, rnchildren * sizeof(*rdptrs)); |
| 264 | memcpy(rdkeys, ldkeys + lnchildren - n, n * sizeof(*rdkeys)); |
| 265 | memcpy(rdptrs, ldptrs + lnchildren - n, n * sizeof(*rdptrs)); |
| 266 | |
| 267 | lnchildren -= n; |
| 268 | rnchildren += n; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 269 | nilfs_btree_node_set_nchildren(left, lnchildren); |
| 270 | nilfs_btree_node_set_nchildren(right, rnchildren); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 271 | } |
| 272 | |
| 273 | /* Assume that the buffer head corresponding to node is locked. */ |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 274 | static void nilfs_btree_node_insert(struct nilfs_btree_node *node, int index, |
| 275 | __u64 key, __u64 ptr, int ncmax) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 276 | { |
| 277 | __le64 *dkeys; |
| 278 | __le64 *dptrs; |
| 279 | int nchildren; |
| 280 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 281 | dkeys = nilfs_btree_node_dkeys(node); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 282 | dptrs = nilfs_btree_node_dptrs(node, ncmax); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 283 | nchildren = nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 284 | if (index < nchildren) { |
| 285 | memmove(dkeys + index + 1, dkeys + index, |
| 286 | (nchildren - index) * sizeof(*dkeys)); |
| 287 | memmove(dptrs + index + 1, dptrs + index, |
| 288 | (nchildren - index) * sizeof(*dptrs)); |
| 289 | } |
Ryusuke Konishi | 25b8d7d | 2010-07-10 16:50:41 +0900 | [diff] [blame] | 290 | dkeys[index] = cpu_to_le64(key); |
| 291 | dptrs[index] = cpu_to_le64(ptr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 292 | nchildren++; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 293 | nilfs_btree_node_set_nchildren(node, nchildren); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 294 | } |
| 295 | |
| 296 | /* Assume that the buffer head corresponding to node is locked. */ |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 297 | static void nilfs_btree_node_delete(struct nilfs_btree_node *node, int index, |
| 298 | __u64 *keyp, __u64 *ptrp, int ncmax) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 299 | { |
| 300 | __u64 key; |
| 301 | __u64 ptr; |
| 302 | __le64 *dkeys; |
| 303 | __le64 *dptrs; |
| 304 | int nchildren; |
| 305 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 306 | dkeys = nilfs_btree_node_dkeys(node); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 307 | dptrs = nilfs_btree_node_dptrs(node, ncmax); |
Ryusuke Konishi | 25b8d7d | 2010-07-10 16:50:41 +0900 | [diff] [blame] | 308 | key = le64_to_cpu(dkeys[index]); |
| 309 | ptr = le64_to_cpu(dptrs[index]); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 310 | nchildren = nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 311 | if (keyp != NULL) |
| 312 | *keyp = key; |
| 313 | if (ptrp != NULL) |
| 314 | *ptrp = ptr; |
| 315 | |
| 316 | if (index < nchildren - 1) { |
| 317 | memmove(dkeys + index, dkeys + index + 1, |
| 318 | (nchildren - index - 1) * sizeof(*dkeys)); |
| 319 | memmove(dptrs + index, dptrs + index + 1, |
| 320 | (nchildren - index - 1) * sizeof(*dptrs)); |
| 321 | } |
| 322 | nchildren--; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 323 | nilfs_btree_node_set_nchildren(node, nchildren); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 324 | } |
| 325 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 326 | static int nilfs_btree_node_lookup(const struct nilfs_btree_node *node, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 327 | __u64 key, int *indexp) |
| 328 | { |
| 329 | __u64 nkey; |
| 330 | int index, low, high, s; |
| 331 | |
| 332 | /* binary search */ |
| 333 | low = 0; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 334 | high = nilfs_btree_node_get_nchildren(node) - 1; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 335 | index = 0; |
| 336 | s = 0; |
| 337 | while (low <= high) { |
| 338 | index = (low + high) / 2; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 339 | nkey = nilfs_btree_node_get_key(node, index); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 340 | if (nkey == key) { |
| 341 | s = 0; |
| 342 | goto out; |
| 343 | } else if (nkey < key) { |
| 344 | low = index + 1; |
| 345 | s = -1; |
| 346 | } else { |
| 347 | high = index - 1; |
| 348 | s = 1; |
| 349 | } |
| 350 | } |
| 351 | |
| 352 | /* adjust index */ |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 353 | if (nilfs_btree_node_get_level(node) > NILFS_BTREE_LEVEL_NODE_MIN) { |
| 354 | if (s > 0 && index > 0) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 355 | index--; |
| 356 | } else if (s < 0) |
| 357 | index++; |
| 358 | |
| 359 | out: |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 360 | *indexp = index; |
| 361 | |
| 362 | return s == 0; |
| 363 | } |
| 364 | |
Ryusuke Konishi | 1d5385b | 2010-07-16 23:52:40 +0900 | [diff] [blame] | 365 | /** |
| 366 | * nilfs_btree_node_broken - verify consistency of btree node |
| 367 | * @node: btree node block to be examined |
| 368 | * @size: node size (in bytes) |
| 369 | * @blocknr: block number |
| 370 | * |
| 371 | * Return Value: If node is broken, 1 is returned. Otherwise, 0 is returned. |
| 372 | */ |
| 373 | static int nilfs_btree_node_broken(const struct nilfs_btree_node *node, |
| 374 | size_t size, sector_t blocknr) |
| 375 | { |
| 376 | int level, flags, nchildren; |
| 377 | int ret = 0; |
| 378 | |
| 379 | level = nilfs_btree_node_get_level(node); |
| 380 | flags = nilfs_btree_node_get_flags(node); |
| 381 | nchildren = nilfs_btree_node_get_nchildren(node); |
| 382 | |
| 383 | if (unlikely(level < NILFS_BTREE_LEVEL_NODE_MIN || |
| 384 | level >= NILFS_BTREE_LEVEL_MAX || |
| 385 | (flags & NILFS_BTREE_NODE_ROOT) || |
| 386 | nchildren < 0 || |
| 387 | nchildren > NILFS_BTREE_NODE_NCHILDREN_MAX(size))) { |
| 388 | printk(KERN_CRIT "NILFS: bad btree node (blocknr=%llu): " |
| 389 | "level = %d, flags = 0x%x, nchildren = %d\n", |
| 390 | (unsigned long long)blocknr, level, flags, nchildren); |
| 391 | ret = 1; |
| 392 | } |
| 393 | return ret; |
| 394 | } |
| 395 | |
| 396 | int nilfs_btree_broken_node_block(struct buffer_head *bh) |
| 397 | { |
| 398 | return nilfs_btree_node_broken((struct nilfs_btree_node *)bh->b_data, |
| 399 | bh->b_size, bh->b_blocknr); |
| 400 | } |
| 401 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame^] | 402 | static struct nilfs_btree_node * |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 403 | nilfs_btree_get_root(const struct nilfs_bmap *btree) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 404 | { |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 405 | return (struct nilfs_btree_node *)btree->b_u.u_data; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 406 | } |
| 407 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame^] | 408 | static struct nilfs_btree_node * |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 409 | nilfs_btree_get_nonroot_node(const struct nilfs_btree_path *path, int level) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 410 | { |
| 411 | return (struct nilfs_btree_node *)path[level].bp_bh->b_data; |
| 412 | } |
| 413 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame^] | 414 | static struct nilfs_btree_node * |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 415 | nilfs_btree_get_sib_node(const struct nilfs_btree_path *path, int level) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 416 | { |
| 417 | return (struct nilfs_btree_node *)path[level].bp_sib_bh->b_data; |
| 418 | } |
| 419 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame^] | 420 | static int nilfs_btree_height(const struct nilfs_bmap *btree) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 421 | { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 422 | return nilfs_btree_node_get_level(nilfs_btree_get_root(btree)) + 1; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 423 | } |
| 424 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 425 | static struct nilfs_btree_node * |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 426 | nilfs_btree_get_node(const struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 427 | const struct nilfs_btree_path *path, |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 428 | int level, int *ncmaxp) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 429 | { |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 430 | struct nilfs_btree_node *node; |
| 431 | |
| 432 | if (level == nilfs_btree_height(btree) - 1) { |
| 433 | node = nilfs_btree_get_root(btree); |
| 434 | *ncmaxp = NILFS_BTREE_ROOT_NCHILDREN_MAX; |
| 435 | } else { |
| 436 | node = nilfs_btree_get_nonroot_node(path, level); |
| 437 | *ncmaxp = nilfs_btree_nchildren_per_block(btree); |
| 438 | } |
| 439 | return node; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 440 | } |
| 441 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame^] | 442 | static int |
Ryusuke Konishi | 9b945d5 | 2009-10-10 22:58:10 +0900 | [diff] [blame] | 443 | nilfs_btree_bad_node(struct nilfs_btree_node *node, int level) |
| 444 | { |
| 445 | if (unlikely(nilfs_btree_node_get_level(node) != level)) { |
| 446 | dump_stack(); |
| 447 | printk(KERN_CRIT "NILFS: btree level mismatch: %d != %d\n", |
| 448 | nilfs_btree_node_get_level(node), level); |
| 449 | return 1; |
| 450 | } |
| 451 | return 0; |
| 452 | } |
| 453 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 454 | static int nilfs_btree_do_lookup(const struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 455 | struct nilfs_btree_path *path, |
| 456 | __u64 key, __u64 *ptrp, int minlevel) |
| 457 | { |
| 458 | struct nilfs_btree_node *node; |
| 459 | __u64 ptr; |
Ryusuke Konishi | ea64ab8 | 2010-07-13 23:33:52 +0900 | [diff] [blame] | 460 | int level, index, found, ncmax, ret; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 461 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 462 | node = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 463 | level = nilfs_btree_node_get_level(node); |
| 464 | if (level < minlevel || nilfs_btree_node_get_nchildren(node) <= 0) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 465 | return -ENOENT; |
| 466 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 467 | found = nilfs_btree_node_lookup(node, key, &index); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 468 | ptr = nilfs_btree_node_get_ptr(node, index, |
| 469 | NILFS_BTREE_ROOT_NCHILDREN_MAX); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 470 | path[level].bp_bh = NULL; |
| 471 | path[level].bp_index = index; |
| 472 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 473 | ncmax = nilfs_btree_nchildren_per_block(btree); |
Ryusuke Konishi | ea64ab8 | 2010-07-13 23:33:52 +0900 | [diff] [blame] | 474 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 475 | for (level--; level >= minlevel; level--) { |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 476 | ret = nilfs_btree_get_block(btree, ptr, &path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 477 | if (ret < 0) |
| 478 | return ret; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 479 | node = nilfs_btree_get_nonroot_node(path, level); |
Ryusuke Konishi | 9b945d5 | 2009-10-10 22:58:10 +0900 | [diff] [blame] | 480 | if (nilfs_btree_bad_node(node, level)) |
| 481 | return -EINVAL; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 482 | if (!found) |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 483 | found = nilfs_btree_node_lookup(node, key, &index); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 484 | else |
| 485 | index = 0; |
Ryusuke Konishi | ea64ab8 | 2010-07-13 23:33:52 +0900 | [diff] [blame] | 486 | if (index < ncmax) { |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 487 | ptr = nilfs_btree_node_get_ptr(node, index, ncmax); |
Ryusuke Konishi | ea64ab8 | 2010-07-13 23:33:52 +0900 | [diff] [blame] | 488 | } else { |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 489 | WARN_ON(found || level != NILFS_BTREE_LEVEL_NODE_MIN); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 490 | /* insert */ |
| 491 | ptr = NILFS_BMAP_INVALID_PTR; |
| 492 | } |
| 493 | path[level].bp_index = index; |
| 494 | } |
| 495 | if (!found) |
| 496 | return -ENOENT; |
| 497 | |
| 498 | if (ptrp != NULL) |
| 499 | *ptrp = ptr; |
| 500 | |
| 501 | return 0; |
| 502 | } |
| 503 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 504 | static int nilfs_btree_do_lookup_last(const struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 505 | struct nilfs_btree_path *path, |
| 506 | __u64 *keyp, __u64 *ptrp) |
| 507 | { |
| 508 | struct nilfs_btree_node *node; |
| 509 | __u64 ptr; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 510 | int index, level, ncmax, ret; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 511 | |
| 512 | node = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 513 | index = nilfs_btree_node_get_nchildren(node) - 1; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 514 | if (index < 0) |
| 515 | return -ENOENT; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 516 | level = nilfs_btree_node_get_level(node); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 517 | ptr = nilfs_btree_node_get_ptr(node, index, |
| 518 | NILFS_BTREE_ROOT_NCHILDREN_MAX); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 519 | path[level].bp_bh = NULL; |
| 520 | path[level].bp_index = index; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 521 | ncmax = nilfs_btree_nchildren_per_block(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 522 | |
| 523 | for (level--; level > 0; level--) { |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 524 | ret = nilfs_btree_get_block(btree, ptr, &path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 525 | if (ret < 0) |
| 526 | return ret; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 527 | node = nilfs_btree_get_nonroot_node(path, level); |
Ryusuke Konishi | 9b945d5 | 2009-10-10 22:58:10 +0900 | [diff] [blame] | 528 | if (nilfs_btree_bad_node(node, level)) |
| 529 | return -EINVAL; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 530 | index = nilfs_btree_node_get_nchildren(node) - 1; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 531 | ptr = nilfs_btree_node_get_ptr(node, index, ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 532 | path[level].bp_index = index; |
| 533 | } |
| 534 | |
| 535 | if (keyp != NULL) |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 536 | *keyp = nilfs_btree_node_get_key(node, index); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 537 | if (ptrp != NULL) |
| 538 | *ptrp = ptr; |
| 539 | |
| 540 | return 0; |
| 541 | } |
| 542 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 543 | static int nilfs_btree_lookup(const struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 544 | __u64 key, int level, __u64 *ptrp) |
| 545 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 546 | struct nilfs_btree_path *path; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 547 | int ret; |
| 548 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 549 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 550 | if (path == NULL) |
| 551 | return -ENOMEM; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 552 | |
Ryusuke Konishi | 364ec2d | 2010-07-13 23:33:51 +0900 | [diff] [blame] | 553 | ret = nilfs_btree_do_lookup(btree, path, key, ptrp, level); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 554 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 555 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 556 | |
| 557 | return ret; |
| 558 | } |
| 559 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 560 | static int nilfs_btree_lookup_contig(const struct nilfs_bmap *btree, |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 561 | __u64 key, __u64 *ptrp, unsigned maxblocks) |
| 562 | { |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 563 | struct nilfs_btree_path *path; |
| 564 | struct nilfs_btree_node *node; |
| 565 | struct inode *dat = NULL; |
| 566 | __u64 ptr, ptr2; |
| 567 | sector_t blocknr; |
| 568 | int level = NILFS_BTREE_LEVEL_NODE_MIN; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 569 | int ret, cnt, index, maxlevel, ncmax; |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 570 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 571 | path = nilfs_btree_alloc_path(); |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 572 | if (path == NULL) |
| 573 | return -ENOMEM; |
Li Hong | f905440 | 2010-04-02 17:36:34 +0800 | [diff] [blame] | 574 | |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 575 | ret = nilfs_btree_do_lookup(btree, path, key, &ptr, level); |
| 576 | if (ret < 0) |
| 577 | goto out; |
| 578 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 579 | if (NILFS_BMAP_USE_VBN(btree)) { |
| 580 | dat = nilfs_bmap_get_dat(btree); |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 581 | ret = nilfs_dat_translate(dat, ptr, &blocknr); |
| 582 | if (ret < 0) |
| 583 | goto out; |
| 584 | ptr = blocknr; |
| 585 | } |
| 586 | cnt = 1; |
| 587 | if (cnt == maxblocks) |
| 588 | goto end; |
| 589 | |
| 590 | maxlevel = nilfs_btree_height(btree) - 1; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 591 | node = nilfs_btree_get_node(btree, path, level, &ncmax); |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 592 | index = path[level].bp_index + 1; |
| 593 | for (;;) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 594 | while (index < nilfs_btree_node_get_nchildren(node)) { |
| 595 | if (nilfs_btree_node_get_key(node, index) != |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 596 | key + cnt) |
| 597 | goto end; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 598 | ptr2 = nilfs_btree_node_get_ptr(node, index, ncmax); |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 599 | if (dat) { |
| 600 | ret = nilfs_dat_translate(dat, ptr2, &blocknr); |
| 601 | if (ret < 0) |
| 602 | goto out; |
| 603 | ptr2 = blocknr; |
| 604 | } |
| 605 | if (ptr2 != ptr + cnt || ++cnt == maxblocks) |
| 606 | goto end; |
| 607 | index++; |
| 608 | continue; |
| 609 | } |
| 610 | if (level == maxlevel) |
| 611 | break; |
| 612 | |
| 613 | /* look-up right sibling node */ |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 614 | node = nilfs_btree_get_node(btree, path, level + 1, &ncmax); |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 615 | index = path[level + 1].bp_index + 1; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 616 | if (index >= nilfs_btree_node_get_nchildren(node) || |
| 617 | nilfs_btree_node_get_key(node, index) != key + cnt) |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 618 | break; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 619 | ptr2 = nilfs_btree_node_get_ptr(node, index, ncmax); |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 620 | path[level + 1].bp_index = index; |
| 621 | |
| 622 | brelse(path[level].bp_bh); |
| 623 | path[level].bp_bh = NULL; |
| 624 | ret = nilfs_btree_get_block(btree, ptr2, &path[level].bp_bh); |
| 625 | if (ret < 0) |
| 626 | goto out; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 627 | node = nilfs_btree_get_nonroot_node(path, level); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 628 | ncmax = nilfs_btree_nchildren_per_block(btree); |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 629 | index = 0; |
| 630 | path[level].bp_index = index; |
| 631 | } |
| 632 | end: |
| 633 | *ptrp = ptr; |
| 634 | ret = cnt; |
| 635 | out: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 636 | nilfs_btree_free_path(path); |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 637 | return ret; |
| 638 | } |
| 639 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 640 | static void nilfs_btree_promote_key(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 641 | struct nilfs_btree_path *path, |
| 642 | int level, __u64 key) |
| 643 | { |
| 644 | if (level < nilfs_btree_height(btree) - 1) { |
| 645 | do { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 646 | nilfs_btree_node_set_key( |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 647 | nilfs_btree_get_nonroot_node(path, level), |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 648 | path[level].bp_index, key); |
| 649 | if (!buffer_dirty(path[level].bp_bh)) |
| 650 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 651 | } while ((path[level].bp_index == 0) && |
| 652 | (++level < nilfs_btree_height(btree) - 1)); |
| 653 | } |
| 654 | |
| 655 | /* root */ |
| 656 | if (level == nilfs_btree_height(btree) - 1) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 657 | nilfs_btree_node_set_key(nilfs_btree_get_root(btree), |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 658 | path[level].bp_index, key); |
| 659 | } |
| 660 | } |
| 661 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 662 | static void nilfs_btree_do_insert(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 663 | struct nilfs_btree_path *path, |
| 664 | int level, __u64 *keyp, __u64 *ptrp) |
| 665 | { |
| 666 | struct nilfs_btree_node *node; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 667 | int ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 668 | |
| 669 | if (level < nilfs_btree_height(btree) - 1) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 670 | node = nilfs_btree_get_nonroot_node(path, level); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 671 | ncblk = nilfs_btree_nchildren_per_block(btree); |
| 672 | nilfs_btree_node_insert(node, path[level].bp_index, |
| 673 | *keyp, *ptrp, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 674 | if (!buffer_dirty(path[level].bp_bh)) |
| 675 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 676 | |
| 677 | if (path[level].bp_index == 0) |
| 678 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 679 | nilfs_btree_node_get_key(node, |
| 680 | 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 681 | } else { |
| 682 | node = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 683 | nilfs_btree_node_insert(node, path[level].bp_index, |
| 684 | *keyp, *ptrp, |
| 685 | NILFS_BTREE_ROOT_NCHILDREN_MAX); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 686 | } |
| 687 | } |
| 688 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 689 | static void nilfs_btree_carry_left(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 690 | struct nilfs_btree_path *path, |
| 691 | int level, __u64 *keyp, __u64 *ptrp) |
| 692 | { |
| 693 | struct nilfs_btree_node *node, *left; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 694 | int nchildren, lnchildren, n, move, ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 695 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 696 | node = nilfs_btree_get_nonroot_node(path, level); |
| 697 | left = nilfs_btree_get_sib_node(path, level); |
| 698 | nchildren = nilfs_btree_node_get_nchildren(node); |
| 699 | lnchildren = nilfs_btree_node_get_nchildren(left); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 700 | ncblk = nilfs_btree_nchildren_per_block(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 701 | move = 0; |
| 702 | |
| 703 | n = (nchildren + lnchildren + 1) / 2 - lnchildren; |
| 704 | if (n > path[level].bp_index) { |
| 705 | /* move insert point */ |
| 706 | n--; |
| 707 | move = 1; |
| 708 | } |
| 709 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 710 | nilfs_btree_node_move_left(left, node, n, ncblk, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 711 | |
| 712 | if (!buffer_dirty(path[level].bp_bh)) |
| 713 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 714 | if (!buffer_dirty(path[level].bp_sib_bh)) |
| 715 | nilfs_btnode_mark_dirty(path[level].bp_sib_bh); |
| 716 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 717 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 718 | nilfs_btree_node_get_key(node, 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 719 | |
| 720 | if (move) { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 721 | brelse(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 722 | path[level].bp_bh = path[level].bp_sib_bh; |
| 723 | path[level].bp_sib_bh = NULL; |
| 724 | path[level].bp_index += lnchildren; |
| 725 | path[level + 1].bp_index--; |
| 726 | } else { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 727 | brelse(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 728 | path[level].bp_sib_bh = NULL; |
| 729 | path[level].bp_index -= n; |
| 730 | } |
| 731 | |
| 732 | nilfs_btree_do_insert(btree, path, level, keyp, ptrp); |
| 733 | } |
| 734 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 735 | static void nilfs_btree_carry_right(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 736 | struct nilfs_btree_path *path, |
| 737 | int level, __u64 *keyp, __u64 *ptrp) |
| 738 | { |
| 739 | struct nilfs_btree_node *node, *right; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 740 | int nchildren, rnchildren, n, move, ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 741 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 742 | node = nilfs_btree_get_nonroot_node(path, level); |
| 743 | right = nilfs_btree_get_sib_node(path, level); |
| 744 | nchildren = nilfs_btree_node_get_nchildren(node); |
| 745 | rnchildren = nilfs_btree_node_get_nchildren(right); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 746 | ncblk = nilfs_btree_nchildren_per_block(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 747 | move = 0; |
| 748 | |
| 749 | n = (nchildren + rnchildren + 1) / 2 - rnchildren; |
| 750 | if (n > nchildren - path[level].bp_index) { |
| 751 | /* move insert point */ |
| 752 | n--; |
| 753 | move = 1; |
| 754 | } |
| 755 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 756 | nilfs_btree_node_move_right(node, right, n, ncblk, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 757 | |
| 758 | if (!buffer_dirty(path[level].bp_bh)) |
| 759 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 760 | if (!buffer_dirty(path[level].bp_sib_bh)) |
| 761 | nilfs_btnode_mark_dirty(path[level].bp_sib_bh); |
| 762 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 763 | path[level + 1].bp_index++; |
| 764 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 765 | nilfs_btree_node_get_key(right, 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 766 | path[level + 1].bp_index--; |
| 767 | |
| 768 | if (move) { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 769 | brelse(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 770 | path[level].bp_bh = path[level].bp_sib_bh; |
| 771 | path[level].bp_sib_bh = NULL; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 772 | path[level].bp_index -= nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 773 | path[level + 1].bp_index++; |
| 774 | } else { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 775 | brelse(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 776 | path[level].bp_sib_bh = NULL; |
| 777 | } |
| 778 | |
| 779 | nilfs_btree_do_insert(btree, path, level, keyp, ptrp); |
| 780 | } |
| 781 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 782 | static void nilfs_btree_split(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 783 | struct nilfs_btree_path *path, |
| 784 | int level, __u64 *keyp, __u64 *ptrp) |
| 785 | { |
| 786 | struct nilfs_btree_node *node, *right; |
| 787 | __u64 newkey; |
| 788 | __u64 newptr; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 789 | int nchildren, n, move, ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 790 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 791 | node = nilfs_btree_get_nonroot_node(path, level); |
| 792 | right = nilfs_btree_get_sib_node(path, level); |
| 793 | nchildren = nilfs_btree_node_get_nchildren(node); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 794 | ncblk = nilfs_btree_nchildren_per_block(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 795 | move = 0; |
| 796 | |
| 797 | n = (nchildren + 1) / 2; |
| 798 | if (n > nchildren - path[level].bp_index) { |
| 799 | n--; |
| 800 | move = 1; |
| 801 | } |
| 802 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 803 | nilfs_btree_node_move_right(node, right, n, ncblk, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 804 | |
| 805 | if (!buffer_dirty(path[level].bp_bh)) |
| 806 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 807 | if (!buffer_dirty(path[level].bp_sib_bh)) |
| 808 | nilfs_btnode_mark_dirty(path[level].bp_sib_bh); |
| 809 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 810 | newkey = nilfs_btree_node_get_key(right, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 811 | newptr = path[level].bp_newreq.bpr_ptr; |
| 812 | |
| 813 | if (move) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 814 | path[level].bp_index -= nilfs_btree_node_get_nchildren(node); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 815 | nilfs_btree_node_insert(right, path[level].bp_index, |
| 816 | *keyp, *ptrp, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 817 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 818 | *keyp = nilfs_btree_node_get_key(right, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 819 | *ptrp = path[level].bp_newreq.bpr_ptr; |
| 820 | |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 821 | brelse(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 822 | path[level].bp_bh = path[level].bp_sib_bh; |
| 823 | path[level].bp_sib_bh = NULL; |
| 824 | } else { |
| 825 | nilfs_btree_do_insert(btree, path, level, keyp, ptrp); |
| 826 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 827 | *keyp = nilfs_btree_node_get_key(right, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 828 | *ptrp = path[level].bp_newreq.bpr_ptr; |
| 829 | |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 830 | brelse(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 831 | path[level].bp_sib_bh = NULL; |
| 832 | } |
| 833 | |
| 834 | path[level + 1].bp_index++; |
| 835 | } |
| 836 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 837 | static void nilfs_btree_grow(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 838 | struct nilfs_btree_path *path, |
| 839 | int level, __u64 *keyp, __u64 *ptrp) |
| 840 | { |
| 841 | struct nilfs_btree_node *root, *child; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 842 | int n, ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 843 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 844 | root = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 845 | child = nilfs_btree_get_sib_node(path, level); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 846 | ncblk = nilfs_btree_nchildren_per_block(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 847 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 848 | n = nilfs_btree_node_get_nchildren(root); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 849 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 850 | nilfs_btree_node_move_right(root, child, n, |
| 851 | NILFS_BTREE_ROOT_NCHILDREN_MAX, ncblk); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 852 | nilfs_btree_node_set_level(root, level + 1); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 853 | |
| 854 | if (!buffer_dirty(path[level].bp_sib_bh)) |
| 855 | nilfs_btnode_mark_dirty(path[level].bp_sib_bh); |
| 856 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 857 | path[level].bp_bh = path[level].bp_sib_bh; |
| 858 | path[level].bp_sib_bh = NULL; |
| 859 | |
| 860 | nilfs_btree_do_insert(btree, path, level, keyp, ptrp); |
| 861 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 862 | *keyp = nilfs_btree_node_get_key(child, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 863 | *ptrp = path[level].bp_newreq.bpr_ptr; |
| 864 | } |
| 865 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 866 | static __u64 nilfs_btree_find_near(const struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 867 | const struct nilfs_btree_path *path) |
| 868 | { |
| 869 | struct nilfs_btree_node *node; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 870 | int level, ncmax; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 871 | |
| 872 | if (path == NULL) |
| 873 | return NILFS_BMAP_INVALID_PTR; |
| 874 | |
| 875 | /* left sibling */ |
| 876 | level = NILFS_BTREE_LEVEL_NODE_MIN; |
| 877 | if (path[level].bp_index > 0) { |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 878 | node = nilfs_btree_get_node(btree, path, level, &ncmax); |
| 879 | return nilfs_btree_node_get_ptr(node, |
| 880 | path[level].bp_index - 1, |
| 881 | ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 882 | } |
| 883 | |
| 884 | /* parent */ |
| 885 | level = NILFS_BTREE_LEVEL_NODE_MIN + 1; |
| 886 | if (level <= nilfs_btree_height(btree) - 1) { |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 887 | node = nilfs_btree_get_node(btree, path, level, &ncmax); |
| 888 | return nilfs_btree_node_get_ptr(node, path[level].bp_index, |
| 889 | ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 890 | } |
| 891 | |
| 892 | return NILFS_BMAP_INVALID_PTR; |
| 893 | } |
| 894 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 895 | static __u64 nilfs_btree_find_target_v(const struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 896 | const struct nilfs_btree_path *path, |
| 897 | __u64 key) |
| 898 | { |
| 899 | __u64 ptr; |
| 900 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 901 | ptr = nilfs_bmap_find_target_seq(btree, key); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 902 | if (ptr != NILFS_BMAP_INVALID_PTR) |
| 903 | /* sequential access */ |
| 904 | return ptr; |
| 905 | else { |
| 906 | ptr = nilfs_btree_find_near(btree, path); |
| 907 | if (ptr != NILFS_BMAP_INVALID_PTR) |
| 908 | /* near */ |
| 909 | return ptr; |
| 910 | } |
| 911 | /* block group */ |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 912 | return nilfs_bmap_find_target_in_group(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 913 | } |
| 914 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 915 | static int nilfs_btree_prepare_insert(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 916 | struct nilfs_btree_path *path, |
| 917 | int *levelp, __u64 key, __u64 ptr, |
| 918 | struct nilfs_bmap_stats *stats) |
| 919 | { |
| 920 | struct buffer_head *bh; |
| 921 | struct nilfs_btree_node *node, *parent, *sib; |
| 922 | __u64 sibptr; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 923 | int pindex, level, ncmax, ncblk, ret; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 924 | struct inode *dat = NULL; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 925 | |
| 926 | stats->bs_nblocks = 0; |
| 927 | level = NILFS_BTREE_LEVEL_DATA; |
| 928 | |
| 929 | /* allocate a new ptr for data block */ |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 930 | if (NILFS_BMAP_USE_VBN(btree)) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 931 | path[level].bp_newreq.bpr_ptr = |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 932 | nilfs_btree_find_target_v(btree, path, key); |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 933 | dat = nilfs_bmap_get_dat(btree); |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 934 | } |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 935 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 936 | ret = nilfs_bmap_prepare_alloc_ptr(btree, &path[level].bp_newreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 937 | if (ret < 0) |
| 938 | goto err_out_data; |
| 939 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 940 | ncblk = nilfs_btree_nchildren_per_block(btree); |
Ryusuke Konishi | ea64ab8 | 2010-07-13 23:33:52 +0900 | [diff] [blame] | 941 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 942 | for (level = NILFS_BTREE_LEVEL_NODE_MIN; |
| 943 | level < nilfs_btree_height(btree) - 1; |
| 944 | level++) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 945 | node = nilfs_btree_get_nonroot_node(path, level); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 946 | if (nilfs_btree_node_get_nchildren(node) < ncblk) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 947 | path[level].bp_op = nilfs_btree_do_insert; |
| 948 | stats->bs_nblocks++; |
| 949 | goto out; |
| 950 | } |
| 951 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 952 | parent = nilfs_btree_get_node(btree, path, level + 1, &ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 953 | pindex = path[level + 1].bp_index; |
| 954 | |
| 955 | /* left sibling */ |
| 956 | if (pindex > 0) { |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 957 | sibptr = nilfs_btree_node_get_ptr(parent, pindex - 1, |
| 958 | ncmax); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 959 | ret = nilfs_btree_get_block(btree, sibptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 960 | if (ret < 0) |
| 961 | goto err_out_child_node; |
| 962 | sib = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 963 | if (nilfs_btree_node_get_nchildren(sib) < ncblk) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 964 | path[level].bp_sib_bh = bh; |
| 965 | path[level].bp_op = nilfs_btree_carry_left; |
| 966 | stats->bs_nblocks++; |
| 967 | goto out; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 968 | } else { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 969 | brelse(bh); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 970 | } |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 971 | } |
| 972 | |
| 973 | /* right sibling */ |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 974 | if (pindex < nilfs_btree_node_get_nchildren(parent) - 1) { |
| 975 | sibptr = nilfs_btree_node_get_ptr(parent, pindex + 1, |
| 976 | ncmax); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 977 | ret = nilfs_btree_get_block(btree, sibptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 978 | if (ret < 0) |
| 979 | goto err_out_child_node; |
| 980 | sib = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 981 | if (nilfs_btree_node_get_nchildren(sib) < ncblk) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 982 | path[level].bp_sib_bh = bh; |
| 983 | path[level].bp_op = nilfs_btree_carry_right; |
| 984 | stats->bs_nblocks++; |
| 985 | goto out; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 986 | } else { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 987 | brelse(bh); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 988 | } |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 989 | } |
| 990 | |
| 991 | /* split */ |
| 992 | path[level].bp_newreq.bpr_ptr = |
| 993 | path[level - 1].bp_newreq.bpr_ptr + 1; |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 994 | ret = nilfs_bmap_prepare_alloc_ptr(btree, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 995 | &path[level].bp_newreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 996 | if (ret < 0) |
| 997 | goto err_out_child_node; |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 998 | ret = nilfs_btree_get_new_block(btree, |
| 999 | path[level].bp_newreq.bpr_ptr, |
| 1000 | &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1001 | if (ret < 0) |
| 1002 | goto err_out_curr_node; |
| 1003 | |
| 1004 | stats->bs_nblocks++; |
| 1005 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1006 | sib = (struct nilfs_btree_node *)bh->b_data; |
| 1007 | nilfs_btree_node_init(sib, 0, level, 0, ncblk, NULL, NULL); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1008 | path[level].bp_sib_bh = bh; |
| 1009 | path[level].bp_op = nilfs_btree_split; |
| 1010 | } |
| 1011 | |
| 1012 | /* root */ |
| 1013 | node = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1014 | if (nilfs_btree_node_get_nchildren(node) < |
Ryusuke Konishi | ea64ab8 | 2010-07-13 23:33:52 +0900 | [diff] [blame] | 1015 | NILFS_BTREE_ROOT_NCHILDREN_MAX) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1016 | path[level].bp_op = nilfs_btree_do_insert; |
| 1017 | stats->bs_nblocks++; |
| 1018 | goto out; |
| 1019 | } |
| 1020 | |
| 1021 | /* grow */ |
| 1022 | path[level].bp_newreq.bpr_ptr = path[level - 1].bp_newreq.bpr_ptr + 1; |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1023 | ret = nilfs_bmap_prepare_alloc_ptr(btree, &path[level].bp_newreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1024 | if (ret < 0) |
| 1025 | goto err_out_child_node; |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1026 | ret = nilfs_btree_get_new_block(btree, path[level].bp_newreq.bpr_ptr, |
| 1027 | &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1028 | if (ret < 0) |
| 1029 | goto err_out_curr_node; |
| 1030 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1031 | nilfs_btree_node_init((struct nilfs_btree_node *)bh->b_data, |
| 1032 | 0, level, 0, ncblk, NULL, NULL); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1033 | path[level].bp_sib_bh = bh; |
| 1034 | path[level].bp_op = nilfs_btree_grow; |
| 1035 | |
| 1036 | level++; |
| 1037 | path[level].bp_op = nilfs_btree_do_insert; |
| 1038 | |
| 1039 | /* a newly-created node block and a data block are added */ |
| 1040 | stats->bs_nblocks += 2; |
| 1041 | |
| 1042 | /* success */ |
| 1043 | out: |
| 1044 | *levelp = level; |
| 1045 | return ret; |
| 1046 | |
| 1047 | /* error */ |
| 1048 | err_out_curr_node: |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1049 | nilfs_bmap_abort_alloc_ptr(btree, &path[level].bp_newreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1050 | err_out_child_node: |
| 1051 | for (level--; level > NILFS_BTREE_LEVEL_DATA; level--) { |
Ryusuke Konishi | 9f09890 | 2009-05-22 00:38:56 +0900 | [diff] [blame] | 1052 | nilfs_btnode_delete(path[level].bp_sib_bh); |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1053 | nilfs_bmap_abort_alloc_ptr(btree, &path[level].bp_newreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1054 | |
| 1055 | } |
| 1056 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1057 | nilfs_bmap_abort_alloc_ptr(btree, &path[level].bp_newreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1058 | err_out_data: |
| 1059 | *levelp = level; |
| 1060 | stats->bs_nblocks = 0; |
| 1061 | return ret; |
| 1062 | } |
| 1063 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1064 | static void nilfs_btree_commit_insert(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1065 | struct nilfs_btree_path *path, |
| 1066 | int maxlevel, __u64 key, __u64 ptr) |
| 1067 | { |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1068 | struct inode *dat = NULL; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1069 | int level; |
| 1070 | |
| 1071 | set_buffer_nilfs_volatile((struct buffer_head *)((unsigned long)ptr)); |
| 1072 | ptr = path[NILFS_BTREE_LEVEL_DATA].bp_newreq.bpr_ptr; |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1073 | if (NILFS_BMAP_USE_VBN(btree)) { |
Ryusuke Konishi | dc935be | 2010-07-10 22:21:54 +0900 | [diff] [blame] | 1074 | nilfs_bmap_set_target_v(btree, key, ptr); |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1075 | dat = nilfs_bmap_get_dat(btree); |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1076 | } |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1077 | |
| 1078 | for (level = NILFS_BTREE_LEVEL_NODE_MIN; level <= maxlevel; level++) { |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1079 | nilfs_bmap_commit_alloc_ptr(btree, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1080 | &path[level - 1].bp_newreq, dat); |
Pekka Enberg | 8acfbf0 | 2009-04-06 19:01:49 -0700 | [diff] [blame] | 1081 | path[level].bp_op(btree, path, level, &key, &ptr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1082 | } |
| 1083 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1084 | if (!nilfs_bmap_dirty(btree)) |
| 1085 | nilfs_bmap_set_dirty(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1086 | } |
| 1087 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1088 | static int nilfs_btree_insert(struct nilfs_bmap *btree, __u64 key, __u64 ptr) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1089 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1090 | struct nilfs_btree_path *path; |
| 1091 | struct nilfs_bmap_stats stats; |
| 1092 | int level, ret; |
| 1093 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1094 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1095 | if (path == NULL) |
| 1096 | return -ENOMEM; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1097 | |
| 1098 | ret = nilfs_btree_do_lookup(btree, path, key, NULL, |
| 1099 | NILFS_BTREE_LEVEL_NODE_MIN); |
| 1100 | if (ret != -ENOENT) { |
| 1101 | if (ret == 0) |
| 1102 | ret = -EEXIST; |
| 1103 | goto out; |
| 1104 | } |
| 1105 | |
| 1106 | ret = nilfs_btree_prepare_insert(btree, path, &level, key, ptr, &stats); |
| 1107 | if (ret < 0) |
| 1108 | goto out; |
| 1109 | nilfs_btree_commit_insert(btree, path, level, key, ptr); |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1110 | nilfs_bmap_add_blocks(btree, stats.bs_nblocks); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1111 | |
| 1112 | out: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1113 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1114 | return ret; |
| 1115 | } |
| 1116 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1117 | static void nilfs_btree_do_delete(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1118 | struct nilfs_btree_path *path, |
| 1119 | int level, __u64 *keyp, __u64 *ptrp) |
| 1120 | { |
| 1121 | struct nilfs_btree_node *node; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1122 | int ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1123 | |
| 1124 | if (level < nilfs_btree_height(btree) - 1) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1125 | node = nilfs_btree_get_nonroot_node(path, level); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1126 | ncblk = nilfs_btree_nchildren_per_block(btree); |
| 1127 | nilfs_btree_node_delete(node, path[level].bp_index, |
| 1128 | keyp, ptrp, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1129 | if (!buffer_dirty(path[level].bp_bh)) |
| 1130 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1131 | if (path[level].bp_index == 0) |
| 1132 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1133 | nilfs_btree_node_get_key(node, 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1134 | } else { |
| 1135 | node = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1136 | nilfs_btree_node_delete(node, path[level].bp_index, |
| 1137 | keyp, ptrp, |
| 1138 | NILFS_BTREE_ROOT_NCHILDREN_MAX); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1139 | } |
| 1140 | } |
| 1141 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1142 | static void nilfs_btree_borrow_left(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1143 | struct nilfs_btree_path *path, |
| 1144 | int level, __u64 *keyp, __u64 *ptrp) |
| 1145 | { |
| 1146 | struct nilfs_btree_node *node, *left; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1147 | int nchildren, lnchildren, n, ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1148 | |
| 1149 | nilfs_btree_do_delete(btree, path, level, keyp, ptrp); |
| 1150 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1151 | node = nilfs_btree_get_nonroot_node(path, level); |
| 1152 | left = nilfs_btree_get_sib_node(path, level); |
| 1153 | nchildren = nilfs_btree_node_get_nchildren(node); |
| 1154 | lnchildren = nilfs_btree_node_get_nchildren(left); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1155 | ncblk = nilfs_btree_nchildren_per_block(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1156 | |
| 1157 | n = (nchildren + lnchildren) / 2 - nchildren; |
| 1158 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1159 | nilfs_btree_node_move_right(left, node, n, ncblk, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1160 | |
| 1161 | if (!buffer_dirty(path[level].bp_bh)) |
| 1162 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 1163 | if (!buffer_dirty(path[level].bp_sib_bh)) |
| 1164 | nilfs_btnode_mark_dirty(path[level].bp_sib_bh); |
| 1165 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1166 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1167 | nilfs_btree_node_get_key(node, 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1168 | |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1169 | brelse(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1170 | path[level].bp_sib_bh = NULL; |
| 1171 | path[level].bp_index += n; |
| 1172 | } |
| 1173 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1174 | static void nilfs_btree_borrow_right(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1175 | struct nilfs_btree_path *path, |
| 1176 | int level, __u64 *keyp, __u64 *ptrp) |
| 1177 | { |
| 1178 | struct nilfs_btree_node *node, *right; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1179 | int nchildren, rnchildren, n, ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1180 | |
| 1181 | nilfs_btree_do_delete(btree, path, level, keyp, ptrp); |
| 1182 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1183 | node = nilfs_btree_get_nonroot_node(path, level); |
| 1184 | right = nilfs_btree_get_sib_node(path, level); |
| 1185 | nchildren = nilfs_btree_node_get_nchildren(node); |
| 1186 | rnchildren = nilfs_btree_node_get_nchildren(right); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1187 | ncblk = nilfs_btree_nchildren_per_block(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1188 | |
| 1189 | n = (nchildren + rnchildren) / 2 - nchildren; |
| 1190 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1191 | nilfs_btree_node_move_left(node, right, n, ncblk, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1192 | |
| 1193 | if (!buffer_dirty(path[level].bp_bh)) |
| 1194 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 1195 | if (!buffer_dirty(path[level].bp_sib_bh)) |
| 1196 | nilfs_btnode_mark_dirty(path[level].bp_sib_bh); |
| 1197 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1198 | path[level + 1].bp_index++; |
| 1199 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1200 | nilfs_btree_node_get_key(right, 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1201 | path[level + 1].bp_index--; |
| 1202 | |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1203 | brelse(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1204 | path[level].bp_sib_bh = NULL; |
| 1205 | } |
| 1206 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1207 | static void nilfs_btree_concat_left(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1208 | struct nilfs_btree_path *path, |
| 1209 | int level, __u64 *keyp, __u64 *ptrp) |
| 1210 | { |
| 1211 | struct nilfs_btree_node *node, *left; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1212 | int n, ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1213 | |
| 1214 | nilfs_btree_do_delete(btree, path, level, keyp, ptrp); |
| 1215 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1216 | node = nilfs_btree_get_nonroot_node(path, level); |
| 1217 | left = nilfs_btree_get_sib_node(path, level); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1218 | ncblk = nilfs_btree_nchildren_per_block(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1219 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1220 | n = nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1221 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1222 | nilfs_btree_node_move_left(left, node, n, ncblk, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1223 | |
| 1224 | if (!buffer_dirty(path[level].bp_sib_bh)) |
| 1225 | nilfs_btnode_mark_dirty(path[level].bp_sib_bh); |
| 1226 | |
Ryusuke Konishi | 9f09890 | 2009-05-22 00:38:56 +0900 | [diff] [blame] | 1227 | nilfs_btnode_delete(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1228 | path[level].bp_bh = path[level].bp_sib_bh; |
| 1229 | path[level].bp_sib_bh = NULL; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1230 | path[level].bp_index += nilfs_btree_node_get_nchildren(left); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1231 | } |
| 1232 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1233 | static void nilfs_btree_concat_right(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1234 | struct nilfs_btree_path *path, |
| 1235 | int level, __u64 *keyp, __u64 *ptrp) |
| 1236 | { |
| 1237 | struct nilfs_btree_node *node, *right; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1238 | int n, ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1239 | |
| 1240 | nilfs_btree_do_delete(btree, path, level, keyp, ptrp); |
| 1241 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1242 | node = nilfs_btree_get_nonroot_node(path, level); |
| 1243 | right = nilfs_btree_get_sib_node(path, level); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1244 | ncblk = nilfs_btree_nchildren_per_block(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1245 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1246 | n = nilfs_btree_node_get_nchildren(right); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1247 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1248 | nilfs_btree_node_move_left(node, right, n, ncblk, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1249 | |
| 1250 | if (!buffer_dirty(path[level].bp_bh)) |
| 1251 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 1252 | |
Ryusuke Konishi | 9f09890 | 2009-05-22 00:38:56 +0900 | [diff] [blame] | 1253 | nilfs_btnode_delete(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1254 | path[level].bp_sib_bh = NULL; |
| 1255 | path[level + 1].bp_index++; |
| 1256 | } |
| 1257 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1258 | static void nilfs_btree_shrink(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1259 | struct nilfs_btree_path *path, |
| 1260 | int level, __u64 *keyp, __u64 *ptrp) |
| 1261 | { |
| 1262 | struct nilfs_btree_node *root, *child; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1263 | int n, ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1264 | |
| 1265 | nilfs_btree_do_delete(btree, path, level, keyp, ptrp); |
| 1266 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1267 | root = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1268 | child = nilfs_btree_get_nonroot_node(path, level); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1269 | ncblk = nilfs_btree_nchildren_per_block(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1270 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1271 | nilfs_btree_node_delete(root, 0, NULL, NULL, |
| 1272 | NILFS_BTREE_ROOT_NCHILDREN_MAX); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1273 | nilfs_btree_node_set_level(root, level); |
| 1274 | n = nilfs_btree_node_get_nchildren(child); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1275 | nilfs_btree_node_move_left(root, child, n, |
| 1276 | NILFS_BTREE_ROOT_NCHILDREN_MAX, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1277 | |
Ryusuke Konishi | 9f09890 | 2009-05-22 00:38:56 +0900 | [diff] [blame] | 1278 | nilfs_btnode_delete(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1279 | path[level].bp_bh = NULL; |
| 1280 | } |
| 1281 | |
| 1282 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1283 | static int nilfs_btree_prepare_delete(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1284 | struct nilfs_btree_path *path, |
| 1285 | int *levelp, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1286 | struct nilfs_bmap_stats *stats, |
| 1287 | struct inode *dat) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1288 | { |
| 1289 | struct buffer_head *bh; |
| 1290 | struct nilfs_btree_node *node, *parent, *sib; |
| 1291 | __u64 sibptr; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1292 | int pindex, level, ncmin, ncmax, ncblk, ret; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1293 | |
| 1294 | ret = 0; |
| 1295 | stats->bs_nblocks = 0; |
Ryusuke Konishi | ea64ab8 | 2010-07-13 23:33:52 +0900 | [diff] [blame] | 1296 | ncmin = NILFS_BTREE_NODE_NCHILDREN_MIN(nilfs_btree_node_size(btree)); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1297 | ncblk = nilfs_btree_nchildren_per_block(btree); |
Ryusuke Konishi | ea64ab8 | 2010-07-13 23:33:52 +0900 | [diff] [blame] | 1298 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1299 | for (level = NILFS_BTREE_LEVEL_NODE_MIN; |
| 1300 | level < nilfs_btree_height(btree) - 1; |
| 1301 | level++) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1302 | node = nilfs_btree_get_nonroot_node(path, level); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1303 | path[level].bp_oldreq.bpr_ptr = |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1304 | nilfs_btree_node_get_ptr(node, path[level].bp_index, |
| 1305 | ncblk); |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1306 | ret = nilfs_bmap_prepare_end_ptr(btree, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1307 | &path[level].bp_oldreq, dat); |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1308 | if (ret < 0) |
| 1309 | goto err_out_child_node; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1310 | |
Ryusuke Konishi | ea64ab8 | 2010-07-13 23:33:52 +0900 | [diff] [blame] | 1311 | if (nilfs_btree_node_get_nchildren(node) > ncmin) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1312 | path[level].bp_op = nilfs_btree_do_delete; |
| 1313 | stats->bs_nblocks++; |
| 1314 | goto out; |
| 1315 | } |
| 1316 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1317 | parent = nilfs_btree_get_node(btree, path, level + 1, &ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1318 | pindex = path[level + 1].bp_index; |
| 1319 | |
| 1320 | if (pindex > 0) { |
| 1321 | /* left sibling */ |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1322 | sibptr = nilfs_btree_node_get_ptr(parent, pindex - 1, |
| 1323 | ncmax); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1324 | ret = nilfs_btree_get_block(btree, sibptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1325 | if (ret < 0) |
| 1326 | goto err_out_curr_node; |
| 1327 | sib = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | ea64ab8 | 2010-07-13 23:33:52 +0900 | [diff] [blame] | 1328 | if (nilfs_btree_node_get_nchildren(sib) > ncmin) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1329 | path[level].bp_sib_bh = bh; |
| 1330 | path[level].bp_op = nilfs_btree_borrow_left; |
| 1331 | stats->bs_nblocks++; |
| 1332 | goto out; |
| 1333 | } else { |
| 1334 | path[level].bp_sib_bh = bh; |
| 1335 | path[level].bp_op = nilfs_btree_concat_left; |
| 1336 | stats->bs_nblocks++; |
| 1337 | /* continue; */ |
| 1338 | } |
| 1339 | } else if (pindex < |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1340 | nilfs_btree_node_get_nchildren(parent) - 1) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1341 | /* right sibling */ |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1342 | sibptr = nilfs_btree_node_get_ptr(parent, pindex + 1, |
| 1343 | ncmax); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1344 | ret = nilfs_btree_get_block(btree, sibptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1345 | if (ret < 0) |
| 1346 | goto err_out_curr_node; |
| 1347 | sib = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | ea64ab8 | 2010-07-13 23:33:52 +0900 | [diff] [blame] | 1348 | if (nilfs_btree_node_get_nchildren(sib) > ncmin) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1349 | path[level].bp_sib_bh = bh; |
| 1350 | path[level].bp_op = nilfs_btree_borrow_right; |
| 1351 | stats->bs_nblocks++; |
| 1352 | goto out; |
| 1353 | } else { |
| 1354 | path[level].bp_sib_bh = bh; |
| 1355 | path[level].bp_op = nilfs_btree_concat_right; |
| 1356 | stats->bs_nblocks++; |
| 1357 | /* continue; */ |
| 1358 | } |
| 1359 | } else { |
| 1360 | /* no siblings */ |
| 1361 | /* the only child of the root node */ |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1362 | WARN_ON(level != nilfs_btree_height(btree) - 2); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1363 | if (nilfs_btree_node_get_nchildren(node) - 1 <= |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1364 | NILFS_BTREE_ROOT_NCHILDREN_MAX) { |
| 1365 | path[level].bp_op = nilfs_btree_shrink; |
| 1366 | stats->bs_nblocks += 2; |
| 1367 | } else { |
| 1368 | path[level].bp_op = nilfs_btree_do_delete; |
| 1369 | stats->bs_nblocks++; |
| 1370 | } |
| 1371 | |
| 1372 | goto out; |
| 1373 | |
| 1374 | } |
| 1375 | } |
| 1376 | |
| 1377 | node = nilfs_btree_get_root(btree); |
| 1378 | path[level].bp_oldreq.bpr_ptr = |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1379 | nilfs_btree_node_get_ptr(node, path[level].bp_index, |
| 1380 | NILFS_BTREE_ROOT_NCHILDREN_MAX); |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1381 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1382 | ret = nilfs_bmap_prepare_end_ptr(btree, &path[level].bp_oldreq, dat); |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1383 | if (ret < 0) |
| 1384 | goto err_out_child_node; |
| 1385 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1386 | /* child of the root node is deleted */ |
| 1387 | path[level].bp_op = nilfs_btree_do_delete; |
| 1388 | stats->bs_nblocks++; |
| 1389 | |
| 1390 | /* success */ |
| 1391 | out: |
| 1392 | *levelp = level; |
| 1393 | return ret; |
| 1394 | |
| 1395 | /* error */ |
| 1396 | err_out_curr_node: |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1397 | nilfs_bmap_abort_end_ptr(btree, &path[level].bp_oldreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1398 | err_out_child_node: |
| 1399 | for (level--; level >= NILFS_BTREE_LEVEL_NODE_MIN; level--) { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1400 | brelse(path[level].bp_sib_bh); |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1401 | nilfs_bmap_abort_end_ptr(btree, &path[level].bp_oldreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1402 | } |
| 1403 | *levelp = level; |
| 1404 | stats->bs_nblocks = 0; |
| 1405 | return ret; |
| 1406 | } |
| 1407 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1408 | static void nilfs_btree_commit_delete(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1409 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1410 | int maxlevel, struct inode *dat) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1411 | { |
| 1412 | int level; |
| 1413 | |
| 1414 | for (level = NILFS_BTREE_LEVEL_NODE_MIN; level <= maxlevel; level++) { |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1415 | nilfs_bmap_commit_end_ptr(btree, &path[level].bp_oldreq, dat); |
Pekka Enberg | 8acfbf0 | 2009-04-06 19:01:49 -0700 | [diff] [blame] | 1416 | path[level].bp_op(btree, path, level, NULL, NULL); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1417 | } |
| 1418 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1419 | if (!nilfs_bmap_dirty(btree)) |
| 1420 | nilfs_bmap_set_dirty(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1421 | } |
| 1422 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1423 | static int nilfs_btree_delete(struct nilfs_bmap *btree, __u64 key) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1424 | |
| 1425 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1426 | struct nilfs_btree_path *path; |
| 1427 | struct nilfs_bmap_stats stats; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1428 | struct inode *dat; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1429 | int level, ret; |
| 1430 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1431 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1432 | if (path == NULL) |
| 1433 | return -ENOMEM; |
Li Hong | f905440 | 2010-04-02 17:36:34 +0800 | [diff] [blame] | 1434 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1435 | ret = nilfs_btree_do_lookup(btree, path, key, NULL, |
| 1436 | NILFS_BTREE_LEVEL_NODE_MIN); |
| 1437 | if (ret < 0) |
| 1438 | goto out; |
| 1439 | |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1440 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1441 | dat = NILFS_BMAP_USE_VBN(btree) ? nilfs_bmap_get_dat(btree) : NULL; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1442 | |
| 1443 | ret = nilfs_btree_prepare_delete(btree, path, &level, &stats, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1444 | if (ret < 0) |
| 1445 | goto out; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1446 | nilfs_btree_commit_delete(btree, path, level, dat); |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1447 | nilfs_bmap_sub_blocks(btree, stats.bs_nblocks); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1448 | |
| 1449 | out: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1450 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1451 | return ret; |
| 1452 | } |
| 1453 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1454 | static int nilfs_btree_last_key(const struct nilfs_bmap *btree, __u64 *keyp) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1455 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1456 | struct nilfs_btree_path *path; |
| 1457 | int ret; |
| 1458 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1459 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1460 | if (path == NULL) |
| 1461 | return -ENOMEM; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1462 | |
| 1463 | ret = nilfs_btree_do_lookup_last(btree, path, keyp, NULL); |
| 1464 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1465 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1466 | |
| 1467 | return ret; |
| 1468 | } |
| 1469 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1470 | static int nilfs_btree_check_delete(struct nilfs_bmap *btree, __u64 key) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1471 | { |
| 1472 | struct buffer_head *bh; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1473 | struct nilfs_btree_node *root, *node; |
| 1474 | __u64 maxkey, nextmaxkey; |
| 1475 | __u64 ptr; |
| 1476 | int nchildren, ret; |
| 1477 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1478 | root = nilfs_btree_get_root(btree); |
| 1479 | switch (nilfs_btree_height(btree)) { |
| 1480 | case 2: |
| 1481 | bh = NULL; |
| 1482 | node = root; |
| 1483 | break; |
| 1484 | case 3: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1485 | nchildren = nilfs_btree_node_get_nchildren(root); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1486 | if (nchildren > 1) |
| 1487 | return 0; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1488 | ptr = nilfs_btree_node_get_ptr(root, nchildren - 1, |
| 1489 | NILFS_BTREE_ROOT_NCHILDREN_MAX); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1490 | ret = nilfs_btree_get_block(btree, ptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1491 | if (ret < 0) |
| 1492 | return ret; |
| 1493 | node = (struct nilfs_btree_node *)bh->b_data; |
| 1494 | break; |
| 1495 | default: |
| 1496 | return 0; |
| 1497 | } |
| 1498 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1499 | nchildren = nilfs_btree_node_get_nchildren(node); |
| 1500 | maxkey = nilfs_btree_node_get_key(node, nchildren - 1); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1501 | nextmaxkey = (nchildren > 1) ? |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1502 | nilfs_btree_node_get_key(node, nchildren - 2) : 0; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1503 | if (bh != NULL) |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1504 | brelse(bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1505 | |
Ryusuke Konishi | 3033342 | 2009-05-24 00:09:44 +0900 | [diff] [blame] | 1506 | return (maxkey == key) && (nextmaxkey < NILFS_BMAP_LARGE_LOW); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1507 | } |
| 1508 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1509 | static int nilfs_btree_gather_data(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1510 | __u64 *keys, __u64 *ptrs, int nitems) |
| 1511 | { |
| 1512 | struct buffer_head *bh; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1513 | struct nilfs_btree_node *node, *root; |
| 1514 | __le64 *dkeys; |
| 1515 | __le64 *dptrs; |
| 1516 | __u64 ptr; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1517 | int nchildren, ncmax, i, ret; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1518 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1519 | root = nilfs_btree_get_root(btree); |
| 1520 | switch (nilfs_btree_height(btree)) { |
| 1521 | case 2: |
| 1522 | bh = NULL; |
| 1523 | node = root; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1524 | ncmax = NILFS_BTREE_ROOT_NCHILDREN_MAX; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1525 | break; |
| 1526 | case 3: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1527 | nchildren = nilfs_btree_node_get_nchildren(root); |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1528 | WARN_ON(nchildren > 1); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1529 | ptr = nilfs_btree_node_get_ptr(root, nchildren - 1, |
| 1530 | NILFS_BTREE_ROOT_NCHILDREN_MAX); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1531 | ret = nilfs_btree_get_block(btree, ptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1532 | if (ret < 0) |
| 1533 | return ret; |
| 1534 | node = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1535 | ncmax = nilfs_btree_nchildren_per_block(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1536 | break; |
| 1537 | default: |
| 1538 | node = NULL; |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1539 | return -EINVAL; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1540 | } |
| 1541 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1542 | nchildren = nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1543 | if (nchildren < nitems) |
| 1544 | nitems = nchildren; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1545 | dkeys = nilfs_btree_node_dkeys(node); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1546 | dptrs = nilfs_btree_node_dptrs(node, ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1547 | for (i = 0; i < nitems; i++) { |
Ryusuke Konishi | 25b8d7d | 2010-07-10 16:50:41 +0900 | [diff] [blame] | 1548 | keys[i] = le64_to_cpu(dkeys[i]); |
| 1549 | ptrs[i] = le64_to_cpu(dptrs[i]); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1550 | } |
| 1551 | |
| 1552 | if (bh != NULL) |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1553 | brelse(bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1554 | |
| 1555 | return nitems; |
| 1556 | } |
| 1557 | |
| 1558 | static int |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1559 | nilfs_btree_prepare_convert_and_insert(struct nilfs_bmap *btree, __u64 key, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1560 | union nilfs_bmap_ptr_req *dreq, |
| 1561 | union nilfs_bmap_ptr_req *nreq, |
| 1562 | struct buffer_head **bhp, |
| 1563 | struct nilfs_bmap_stats *stats) |
| 1564 | { |
| 1565 | struct buffer_head *bh; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1566 | struct inode *dat = NULL; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1567 | int ret; |
| 1568 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1569 | stats->bs_nblocks = 0; |
| 1570 | |
| 1571 | /* for data */ |
| 1572 | /* cannot find near ptr */ |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1573 | if (NILFS_BMAP_USE_VBN(btree)) { |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 1574 | dreq->bpr_ptr = nilfs_btree_find_target_v(btree, NULL, key); |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1575 | dat = nilfs_bmap_get_dat(btree); |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1576 | } |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 1577 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1578 | ret = nilfs_bmap_prepare_alloc_ptr(btree, dreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1579 | if (ret < 0) |
| 1580 | return ret; |
| 1581 | |
| 1582 | *bhp = NULL; |
| 1583 | stats->bs_nblocks++; |
| 1584 | if (nreq != NULL) { |
| 1585 | nreq->bpr_ptr = dreq->bpr_ptr + 1; |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1586 | ret = nilfs_bmap_prepare_alloc_ptr(btree, nreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1587 | if (ret < 0) |
| 1588 | goto err_out_dreq; |
| 1589 | |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1590 | ret = nilfs_btree_get_new_block(btree, nreq->bpr_ptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1591 | if (ret < 0) |
| 1592 | goto err_out_nreq; |
| 1593 | |
| 1594 | *bhp = bh; |
| 1595 | stats->bs_nblocks++; |
| 1596 | } |
| 1597 | |
| 1598 | /* success */ |
| 1599 | return 0; |
| 1600 | |
| 1601 | /* error */ |
| 1602 | err_out_nreq: |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1603 | nilfs_bmap_abort_alloc_ptr(btree, nreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1604 | err_out_dreq: |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1605 | nilfs_bmap_abort_alloc_ptr(btree, dreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1606 | stats->bs_nblocks = 0; |
| 1607 | return ret; |
| 1608 | |
| 1609 | } |
| 1610 | |
| 1611 | static void |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1612 | nilfs_btree_commit_convert_and_insert(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1613 | __u64 key, __u64 ptr, |
| 1614 | const __u64 *keys, const __u64 *ptrs, |
Ryusuke Konishi | 3033342 | 2009-05-24 00:09:44 +0900 | [diff] [blame] | 1615 | int n, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1616 | union nilfs_bmap_ptr_req *dreq, |
| 1617 | union nilfs_bmap_ptr_req *nreq, |
| 1618 | struct buffer_head *bh) |
| 1619 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1620 | struct nilfs_btree_node *node; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1621 | struct inode *dat; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1622 | __u64 tmpptr; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1623 | int ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1624 | |
| 1625 | /* free resources */ |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1626 | if (btree->b_ops->bop_clear != NULL) |
| 1627 | btree->b_ops->bop_clear(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1628 | |
| 1629 | /* ptr must be a pointer to a buffer head. */ |
| 1630 | set_buffer_nilfs_volatile((struct buffer_head *)((unsigned long)ptr)); |
| 1631 | |
| 1632 | /* convert and insert */ |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1633 | dat = NILFS_BMAP_USE_VBN(btree) ? nilfs_bmap_get_dat(btree) : NULL; |
| 1634 | nilfs_btree_init(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1635 | if (nreq != NULL) { |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1636 | nilfs_bmap_commit_alloc_ptr(btree, dreq, dat); |
| 1637 | nilfs_bmap_commit_alloc_ptr(btree, nreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1638 | |
| 1639 | /* create child node at level 1 */ |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1640 | node = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1641 | ncblk = nilfs_btree_nchildren_per_block(btree); |
| 1642 | nilfs_btree_node_init(node, 0, 1, n, ncblk, keys, ptrs); |
| 1643 | nilfs_btree_node_insert(node, n, key, dreq->bpr_ptr, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1644 | if (!buffer_dirty(bh)) |
| 1645 | nilfs_btnode_mark_dirty(bh); |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1646 | if (!nilfs_bmap_dirty(btree)) |
| 1647 | nilfs_bmap_set_dirty(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1648 | |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1649 | brelse(bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1650 | |
| 1651 | /* create root node at level 2 */ |
| 1652 | node = nilfs_btree_get_root(btree); |
| 1653 | tmpptr = nreq->bpr_ptr; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1654 | nilfs_btree_node_init(node, NILFS_BTREE_NODE_ROOT, 2, 1, |
| 1655 | NILFS_BTREE_ROOT_NCHILDREN_MAX, |
| 1656 | &keys[0], &tmpptr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1657 | } else { |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1658 | nilfs_bmap_commit_alloc_ptr(btree, dreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1659 | |
| 1660 | /* create root node at level 1 */ |
| 1661 | node = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1662 | nilfs_btree_node_init(node, NILFS_BTREE_NODE_ROOT, 1, n, |
| 1663 | NILFS_BTREE_ROOT_NCHILDREN_MAX, |
| 1664 | keys, ptrs); |
| 1665 | nilfs_btree_node_insert(node, n, key, dreq->bpr_ptr, |
| 1666 | NILFS_BTREE_ROOT_NCHILDREN_MAX); |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1667 | if (!nilfs_bmap_dirty(btree)) |
| 1668 | nilfs_bmap_set_dirty(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1669 | } |
| 1670 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1671 | if (NILFS_BMAP_USE_VBN(btree)) |
Ryusuke Konishi | dc935be | 2010-07-10 22:21:54 +0900 | [diff] [blame] | 1672 | nilfs_bmap_set_target_v(btree, key, dreq->bpr_ptr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1673 | } |
| 1674 | |
| 1675 | /** |
| 1676 | * nilfs_btree_convert_and_insert - |
| 1677 | * @bmap: |
| 1678 | * @key: |
| 1679 | * @ptr: |
| 1680 | * @keys: |
| 1681 | * @ptrs: |
| 1682 | * @n: |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1683 | */ |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1684 | int nilfs_btree_convert_and_insert(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1685 | __u64 key, __u64 ptr, |
Ryusuke Konishi | 3033342 | 2009-05-24 00:09:44 +0900 | [diff] [blame] | 1686 | const __u64 *keys, const __u64 *ptrs, int n) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1687 | { |
| 1688 | struct buffer_head *bh; |
| 1689 | union nilfs_bmap_ptr_req dreq, nreq, *di, *ni; |
| 1690 | struct nilfs_bmap_stats stats; |
| 1691 | int ret; |
| 1692 | |
| 1693 | if (n + 1 <= NILFS_BTREE_ROOT_NCHILDREN_MAX) { |
| 1694 | di = &dreq; |
| 1695 | ni = NULL; |
| 1696 | } else if ((n + 1) <= NILFS_BTREE_NODE_NCHILDREN_MAX( |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1697 | 1 << btree->b_inode->i_blkbits)) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1698 | di = &dreq; |
| 1699 | ni = &nreq; |
| 1700 | } else { |
| 1701 | di = NULL; |
| 1702 | ni = NULL; |
| 1703 | BUG(); |
| 1704 | } |
| 1705 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1706 | ret = nilfs_btree_prepare_convert_and_insert(btree, key, di, ni, &bh, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1707 | &stats); |
| 1708 | if (ret < 0) |
| 1709 | return ret; |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1710 | nilfs_btree_commit_convert_and_insert(btree, key, ptr, keys, ptrs, n, |
Ryusuke Konishi | 3033342 | 2009-05-24 00:09:44 +0900 | [diff] [blame] | 1711 | di, ni, bh); |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1712 | nilfs_bmap_add_blocks(btree, stats.bs_nblocks); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1713 | return 0; |
| 1714 | } |
| 1715 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1716 | static int nilfs_btree_propagate_p(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1717 | struct nilfs_btree_path *path, |
| 1718 | int level, |
| 1719 | struct buffer_head *bh) |
| 1720 | { |
| 1721 | while ((++level < nilfs_btree_height(btree) - 1) && |
| 1722 | !buffer_dirty(path[level].bp_bh)) |
| 1723 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 1724 | |
| 1725 | return 0; |
| 1726 | } |
| 1727 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1728 | static int nilfs_btree_prepare_update_v(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1729 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1730 | int level, struct inode *dat) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1731 | { |
| 1732 | struct nilfs_btree_node *parent; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1733 | int ncmax, ret; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1734 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1735 | parent = nilfs_btree_get_node(btree, path, level + 1, &ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1736 | path[level].bp_oldreq.bpr_ptr = |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1737 | nilfs_btree_node_get_ptr(parent, path[level + 1].bp_index, |
| 1738 | ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1739 | path[level].bp_newreq.bpr_ptr = path[level].bp_oldreq.bpr_ptr + 1; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1740 | ret = nilfs_dat_prepare_update(dat, &path[level].bp_oldreq.bpr_req, |
| 1741 | &path[level].bp_newreq.bpr_req); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1742 | if (ret < 0) |
| 1743 | return ret; |
| 1744 | |
| 1745 | if (buffer_nilfs_node(path[level].bp_bh)) { |
| 1746 | path[level].bp_ctxt.oldkey = path[level].bp_oldreq.bpr_ptr; |
| 1747 | path[level].bp_ctxt.newkey = path[level].bp_newreq.bpr_ptr; |
| 1748 | path[level].bp_ctxt.bh = path[level].bp_bh; |
| 1749 | ret = nilfs_btnode_prepare_change_key( |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1750 | &NILFS_BMAP_I(btree)->i_btnode_cache, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1751 | &path[level].bp_ctxt); |
| 1752 | if (ret < 0) { |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1753 | nilfs_dat_abort_update(dat, |
| 1754 | &path[level].bp_oldreq.bpr_req, |
| 1755 | &path[level].bp_newreq.bpr_req); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1756 | return ret; |
| 1757 | } |
| 1758 | } |
| 1759 | |
| 1760 | return 0; |
| 1761 | } |
| 1762 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1763 | static void nilfs_btree_commit_update_v(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1764 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1765 | int level, struct inode *dat) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1766 | { |
| 1767 | struct nilfs_btree_node *parent; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1768 | int ncmax; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1769 | |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1770 | nilfs_dat_commit_update(dat, &path[level].bp_oldreq.bpr_req, |
| 1771 | &path[level].bp_newreq.bpr_req, |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1772 | btree->b_ptr_type == NILFS_BMAP_PTR_VS); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1773 | |
| 1774 | if (buffer_nilfs_node(path[level].bp_bh)) { |
| 1775 | nilfs_btnode_commit_change_key( |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1776 | &NILFS_BMAP_I(btree)->i_btnode_cache, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1777 | &path[level].bp_ctxt); |
| 1778 | path[level].bp_bh = path[level].bp_ctxt.bh; |
| 1779 | } |
| 1780 | set_buffer_nilfs_volatile(path[level].bp_bh); |
| 1781 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1782 | parent = nilfs_btree_get_node(btree, path, level + 1, &ncmax); |
| 1783 | nilfs_btree_node_set_ptr(parent, path[level + 1].bp_index, |
| 1784 | path[level].bp_newreq.bpr_ptr, ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1785 | } |
| 1786 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1787 | static void nilfs_btree_abort_update_v(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1788 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1789 | int level, struct inode *dat) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1790 | { |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1791 | nilfs_dat_abort_update(dat, &path[level].bp_oldreq.bpr_req, |
| 1792 | &path[level].bp_newreq.bpr_req); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1793 | if (buffer_nilfs_node(path[level].bp_bh)) |
| 1794 | nilfs_btnode_abort_change_key( |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1795 | &NILFS_BMAP_I(btree)->i_btnode_cache, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1796 | &path[level].bp_ctxt); |
| 1797 | } |
| 1798 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1799 | static int nilfs_btree_prepare_propagate_v(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1800 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1801 | int minlevel, int *maxlevelp, |
| 1802 | struct inode *dat) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1803 | { |
| 1804 | int level, ret; |
| 1805 | |
| 1806 | level = minlevel; |
| 1807 | if (!buffer_nilfs_volatile(path[level].bp_bh)) { |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1808 | ret = nilfs_btree_prepare_update_v(btree, path, level, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1809 | if (ret < 0) |
| 1810 | return ret; |
| 1811 | } |
| 1812 | while ((++level < nilfs_btree_height(btree) - 1) && |
| 1813 | !buffer_dirty(path[level].bp_bh)) { |
| 1814 | |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1815 | WARN_ON(buffer_nilfs_volatile(path[level].bp_bh)); |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1816 | ret = nilfs_btree_prepare_update_v(btree, path, level, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1817 | if (ret < 0) |
| 1818 | goto out; |
| 1819 | } |
| 1820 | |
| 1821 | /* success */ |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1822 | *maxlevelp = level - 1; |
| 1823 | return 0; |
| 1824 | |
| 1825 | /* error */ |
| 1826 | out: |
| 1827 | while (--level > minlevel) |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1828 | nilfs_btree_abort_update_v(btree, path, level, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1829 | if (!buffer_nilfs_volatile(path[level].bp_bh)) |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1830 | nilfs_btree_abort_update_v(btree, path, level, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1831 | return ret; |
| 1832 | } |
| 1833 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1834 | static void nilfs_btree_commit_propagate_v(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1835 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1836 | int minlevel, int maxlevel, |
| 1837 | struct buffer_head *bh, |
| 1838 | struct inode *dat) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1839 | { |
| 1840 | int level; |
| 1841 | |
| 1842 | if (!buffer_nilfs_volatile(path[minlevel].bp_bh)) |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1843 | nilfs_btree_commit_update_v(btree, path, minlevel, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1844 | |
| 1845 | for (level = minlevel + 1; level <= maxlevel; level++) |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1846 | nilfs_btree_commit_update_v(btree, path, level, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1847 | } |
| 1848 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1849 | static int nilfs_btree_propagate_v(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1850 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1851 | int level, struct buffer_head *bh) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1852 | { |
Li Hong | 308f441 | 2010-04-02 18:40:39 +0800 | [diff] [blame] | 1853 | int maxlevel = 0, ret; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1854 | struct nilfs_btree_node *parent; |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1855 | struct inode *dat = nilfs_bmap_get_dat(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1856 | __u64 ptr; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1857 | int ncmax; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1858 | |
| 1859 | get_bh(bh); |
| 1860 | path[level].bp_bh = bh; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1861 | ret = nilfs_btree_prepare_propagate_v(btree, path, level, &maxlevel, |
| 1862 | dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1863 | if (ret < 0) |
| 1864 | goto out; |
| 1865 | |
| 1866 | if (buffer_nilfs_volatile(path[level].bp_bh)) { |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1867 | parent = nilfs_btree_get_node(btree, path, level + 1, &ncmax); |
| 1868 | ptr = nilfs_btree_node_get_ptr(parent, |
| 1869 | path[level + 1].bp_index, |
| 1870 | ncmax); |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1871 | ret = nilfs_dat_mark_dirty(dat, ptr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1872 | if (ret < 0) |
| 1873 | goto out; |
| 1874 | } |
| 1875 | |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1876 | nilfs_btree_commit_propagate_v(btree, path, level, maxlevel, bh, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1877 | |
| 1878 | out: |
| 1879 | brelse(path[level].bp_bh); |
| 1880 | path[level].bp_bh = NULL; |
| 1881 | return ret; |
| 1882 | } |
| 1883 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1884 | static int nilfs_btree_propagate(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1885 | struct buffer_head *bh) |
| 1886 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1887 | struct nilfs_btree_path *path; |
| 1888 | struct nilfs_btree_node *node; |
| 1889 | __u64 key; |
| 1890 | int level, ret; |
| 1891 | |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1892 | WARN_ON(!buffer_dirty(bh)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1893 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1894 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1895 | if (path == NULL) |
| 1896 | return -ENOMEM; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1897 | |
| 1898 | if (buffer_nilfs_node(bh)) { |
| 1899 | node = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1900 | key = nilfs_btree_node_get_key(node, 0); |
| 1901 | level = nilfs_btree_node_get_level(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1902 | } else { |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1903 | key = nilfs_bmap_data_get_key(btree, bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1904 | level = NILFS_BTREE_LEVEL_DATA; |
| 1905 | } |
| 1906 | |
| 1907 | ret = nilfs_btree_do_lookup(btree, path, key, NULL, level + 1); |
| 1908 | if (ret < 0) { |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1909 | if (unlikely(ret == -ENOENT)) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1910 | printk(KERN_CRIT "%s: key = %llu, level == %d\n", |
| 1911 | __func__, (unsigned long long)key, level); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1912 | goto out; |
| 1913 | } |
| 1914 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1915 | ret = NILFS_BMAP_USE_VBN(btree) ? |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 1916 | nilfs_btree_propagate_v(btree, path, level, bh) : |
| 1917 | nilfs_btree_propagate_p(btree, path, level, bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1918 | |
| 1919 | out: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1920 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1921 | |
| 1922 | return ret; |
| 1923 | } |
| 1924 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1925 | static int nilfs_btree_propagate_gc(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1926 | struct buffer_head *bh) |
| 1927 | { |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1928 | return nilfs_dat_mark_dirty(nilfs_bmap_get_dat(btree), bh->b_blocknr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1929 | } |
| 1930 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1931 | static void nilfs_btree_add_dirty_buffer(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1932 | struct list_head *lists, |
| 1933 | struct buffer_head *bh) |
| 1934 | { |
| 1935 | struct list_head *head; |
| 1936 | struct buffer_head *cbh; |
| 1937 | struct nilfs_btree_node *node, *cnode; |
| 1938 | __u64 key, ckey; |
| 1939 | int level; |
| 1940 | |
| 1941 | get_bh(bh); |
| 1942 | node = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1943 | key = nilfs_btree_node_get_key(node, 0); |
| 1944 | level = nilfs_btree_node_get_level(node); |
Ryusuke Konishi | cfa913a | 2010-07-07 17:19:54 +0900 | [diff] [blame] | 1945 | if (level < NILFS_BTREE_LEVEL_NODE_MIN || |
| 1946 | level >= NILFS_BTREE_LEVEL_MAX) { |
| 1947 | dump_stack(); |
| 1948 | printk(KERN_WARNING |
| 1949 | "%s: invalid btree level: %d (key=%llu, ino=%lu, " |
| 1950 | "blocknr=%llu)\n", |
| 1951 | __func__, level, (unsigned long long)key, |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1952 | NILFS_BMAP_I(btree)->vfs_inode.i_ino, |
Ryusuke Konishi | cfa913a | 2010-07-07 17:19:54 +0900 | [diff] [blame] | 1953 | (unsigned long long)bh->b_blocknr); |
| 1954 | return; |
| 1955 | } |
| 1956 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1957 | list_for_each(head, &lists[level]) { |
| 1958 | cbh = list_entry(head, struct buffer_head, b_assoc_buffers); |
| 1959 | cnode = (struct nilfs_btree_node *)cbh->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1960 | ckey = nilfs_btree_node_get_key(cnode, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1961 | if (key < ckey) |
| 1962 | break; |
| 1963 | } |
| 1964 | list_add_tail(&bh->b_assoc_buffers, head); |
| 1965 | } |
| 1966 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1967 | static void nilfs_btree_lookup_dirty_buffers(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1968 | struct list_head *listp) |
| 1969 | { |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1970 | struct address_space *btcache = &NILFS_BMAP_I(btree)->i_btnode_cache; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1971 | struct list_head lists[NILFS_BTREE_LEVEL_MAX]; |
| 1972 | struct pagevec pvec; |
| 1973 | struct buffer_head *bh, *head; |
| 1974 | pgoff_t index = 0; |
| 1975 | int level, i; |
| 1976 | |
| 1977 | for (level = NILFS_BTREE_LEVEL_NODE_MIN; |
| 1978 | level < NILFS_BTREE_LEVEL_MAX; |
| 1979 | level++) |
| 1980 | INIT_LIST_HEAD(&lists[level]); |
| 1981 | |
| 1982 | pagevec_init(&pvec, 0); |
| 1983 | |
| 1984 | while (pagevec_lookup_tag(&pvec, btcache, &index, PAGECACHE_TAG_DIRTY, |
| 1985 | PAGEVEC_SIZE)) { |
| 1986 | for (i = 0; i < pagevec_count(&pvec); i++) { |
| 1987 | bh = head = page_buffers(pvec.pages[i]); |
| 1988 | do { |
| 1989 | if (buffer_dirty(bh)) |
| 1990 | nilfs_btree_add_dirty_buffer(btree, |
| 1991 | lists, bh); |
| 1992 | } while ((bh = bh->b_this_page) != head); |
| 1993 | } |
| 1994 | pagevec_release(&pvec); |
| 1995 | cond_resched(); |
| 1996 | } |
| 1997 | |
| 1998 | for (level = NILFS_BTREE_LEVEL_NODE_MIN; |
| 1999 | level < NILFS_BTREE_LEVEL_MAX; |
| 2000 | level++) |
Ryusuke Konishi | 0935db7 | 2009-11-29 02:39:11 +0900 | [diff] [blame] | 2001 | list_splice_tail(&lists[level], listp); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2002 | } |
| 2003 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2004 | static int nilfs_btree_assign_p(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2005 | struct nilfs_btree_path *path, |
| 2006 | int level, |
| 2007 | struct buffer_head **bh, |
| 2008 | sector_t blocknr, |
| 2009 | union nilfs_binfo *binfo) |
| 2010 | { |
| 2011 | struct nilfs_btree_node *parent; |
| 2012 | __u64 key; |
| 2013 | __u64 ptr; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 2014 | int ncmax, ret; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2015 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 2016 | parent = nilfs_btree_get_node(btree, path, level + 1, &ncmax); |
| 2017 | ptr = nilfs_btree_node_get_ptr(parent, path[level + 1].bp_index, |
| 2018 | ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2019 | if (buffer_nilfs_node(*bh)) { |
| 2020 | path[level].bp_ctxt.oldkey = ptr; |
| 2021 | path[level].bp_ctxt.newkey = blocknr; |
| 2022 | path[level].bp_ctxt.bh = *bh; |
| 2023 | ret = nilfs_btnode_prepare_change_key( |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2024 | &NILFS_BMAP_I(btree)->i_btnode_cache, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2025 | &path[level].bp_ctxt); |
| 2026 | if (ret < 0) |
| 2027 | return ret; |
| 2028 | nilfs_btnode_commit_change_key( |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2029 | &NILFS_BMAP_I(btree)->i_btnode_cache, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2030 | &path[level].bp_ctxt); |
| 2031 | *bh = path[level].bp_ctxt.bh; |
| 2032 | } |
| 2033 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 2034 | nilfs_btree_node_set_ptr(parent, path[level + 1].bp_index, blocknr, |
| 2035 | ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2036 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2037 | key = nilfs_btree_node_get_key(parent, path[level + 1].bp_index); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2038 | /* on-disk format */ |
Ryusuke Konishi | 25b8d7d | 2010-07-10 16:50:41 +0900 | [diff] [blame] | 2039 | binfo->bi_dat.bi_blkoff = cpu_to_le64(key); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2040 | binfo->bi_dat.bi_level = level; |
| 2041 | |
| 2042 | return 0; |
| 2043 | } |
| 2044 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2045 | static int nilfs_btree_assign_v(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2046 | struct nilfs_btree_path *path, |
| 2047 | int level, |
| 2048 | struct buffer_head **bh, |
| 2049 | sector_t blocknr, |
| 2050 | union nilfs_binfo *binfo) |
| 2051 | { |
| 2052 | struct nilfs_btree_node *parent; |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2053 | struct inode *dat = nilfs_bmap_get_dat(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2054 | __u64 key; |
| 2055 | __u64 ptr; |
| 2056 | union nilfs_bmap_ptr_req req; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 2057 | int ncmax, ret; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2058 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 2059 | parent = nilfs_btree_get_node(btree, path, level + 1, &ncmax); |
| 2060 | ptr = nilfs_btree_node_get_ptr(parent, path[level + 1].bp_index, |
| 2061 | ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2062 | req.bpr_ptr = ptr; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 2063 | ret = nilfs_dat_prepare_start(dat, &req.bpr_req); |
| 2064 | if (ret < 0) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2065 | return ret; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 2066 | nilfs_dat_commit_start(dat, &req.bpr_req, blocknr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2067 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2068 | key = nilfs_btree_node_get_key(parent, path[level + 1].bp_index); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2069 | /* on-disk format */ |
Ryusuke Konishi | 25b8d7d | 2010-07-10 16:50:41 +0900 | [diff] [blame] | 2070 | binfo->bi_v.bi_vblocknr = cpu_to_le64(ptr); |
| 2071 | binfo->bi_v.bi_blkoff = cpu_to_le64(key); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2072 | |
| 2073 | return 0; |
| 2074 | } |
| 2075 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2076 | static int nilfs_btree_assign(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2077 | struct buffer_head **bh, |
| 2078 | sector_t blocknr, |
| 2079 | union nilfs_binfo *binfo) |
| 2080 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2081 | struct nilfs_btree_path *path; |
| 2082 | struct nilfs_btree_node *node; |
| 2083 | __u64 key; |
| 2084 | int level, ret; |
| 2085 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2086 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2087 | if (path == NULL) |
| 2088 | return -ENOMEM; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2089 | |
| 2090 | if (buffer_nilfs_node(*bh)) { |
| 2091 | node = (struct nilfs_btree_node *)(*bh)->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2092 | key = nilfs_btree_node_get_key(node, 0); |
| 2093 | level = nilfs_btree_node_get_level(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2094 | } else { |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2095 | key = nilfs_bmap_data_get_key(btree, *bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2096 | level = NILFS_BTREE_LEVEL_DATA; |
| 2097 | } |
| 2098 | |
| 2099 | ret = nilfs_btree_do_lookup(btree, path, key, NULL, level + 1); |
| 2100 | if (ret < 0) { |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 2101 | WARN_ON(ret == -ENOENT); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2102 | goto out; |
| 2103 | } |
| 2104 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2105 | ret = NILFS_BMAP_USE_VBN(btree) ? |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 2106 | nilfs_btree_assign_v(btree, path, level, bh, blocknr, binfo) : |
| 2107 | nilfs_btree_assign_p(btree, path, level, bh, blocknr, binfo); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2108 | |
| 2109 | out: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2110 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2111 | |
| 2112 | return ret; |
| 2113 | } |
| 2114 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2115 | static int nilfs_btree_assign_gc(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2116 | struct buffer_head **bh, |
| 2117 | sector_t blocknr, |
| 2118 | union nilfs_binfo *binfo) |
| 2119 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2120 | struct nilfs_btree_node *node; |
| 2121 | __u64 key; |
| 2122 | int ret; |
| 2123 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2124 | ret = nilfs_dat_move(nilfs_bmap_get_dat(btree), (*bh)->b_blocknr, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 2125 | blocknr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2126 | if (ret < 0) |
| 2127 | return ret; |
| 2128 | |
| 2129 | if (buffer_nilfs_node(*bh)) { |
| 2130 | node = (struct nilfs_btree_node *)(*bh)->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2131 | key = nilfs_btree_node_get_key(node, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2132 | } else |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2133 | key = nilfs_bmap_data_get_key(btree, *bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2134 | |
| 2135 | /* on-disk format */ |
| 2136 | binfo->bi_v.bi_vblocknr = cpu_to_le64((*bh)->b_blocknr); |
Ryusuke Konishi | 25b8d7d | 2010-07-10 16:50:41 +0900 | [diff] [blame] | 2137 | binfo->bi_v.bi_blkoff = cpu_to_le64(key); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2138 | |
| 2139 | return 0; |
| 2140 | } |
| 2141 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2142 | static int nilfs_btree_mark(struct nilfs_bmap *btree, __u64 key, int level) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2143 | { |
| 2144 | struct buffer_head *bh; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2145 | struct nilfs_btree_path *path; |
| 2146 | __u64 ptr; |
| 2147 | int ret; |
| 2148 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2149 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2150 | if (path == NULL) |
| 2151 | return -ENOMEM; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2152 | |
| 2153 | ret = nilfs_btree_do_lookup(btree, path, key, &ptr, level + 1); |
| 2154 | if (ret < 0) { |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 2155 | WARN_ON(ret == -ENOENT); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2156 | goto out; |
| 2157 | } |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 2158 | ret = nilfs_btree_get_block(btree, ptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2159 | if (ret < 0) { |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 2160 | WARN_ON(ret == -ENOENT); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2161 | goto out; |
| 2162 | } |
| 2163 | |
| 2164 | if (!buffer_dirty(bh)) |
| 2165 | nilfs_btnode_mark_dirty(bh); |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 2166 | brelse(bh); |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2167 | if (!nilfs_bmap_dirty(btree)) |
| 2168 | nilfs_bmap_set_dirty(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2169 | |
| 2170 | out: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2171 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2172 | return ret; |
| 2173 | } |
| 2174 | |
| 2175 | static const struct nilfs_bmap_operations nilfs_btree_ops = { |
| 2176 | .bop_lookup = nilfs_btree_lookup, |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 2177 | .bop_lookup_contig = nilfs_btree_lookup_contig, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2178 | .bop_insert = nilfs_btree_insert, |
| 2179 | .bop_delete = nilfs_btree_delete, |
| 2180 | .bop_clear = NULL, |
| 2181 | |
| 2182 | .bop_propagate = nilfs_btree_propagate, |
| 2183 | |
| 2184 | .bop_lookup_dirty_buffers = nilfs_btree_lookup_dirty_buffers, |
| 2185 | |
| 2186 | .bop_assign = nilfs_btree_assign, |
| 2187 | .bop_mark = nilfs_btree_mark, |
| 2188 | |
| 2189 | .bop_last_key = nilfs_btree_last_key, |
| 2190 | .bop_check_insert = NULL, |
| 2191 | .bop_check_delete = nilfs_btree_check_delete, |
| 2192 | .bop_gather_data = nilfs_btree_gather_data, |
| 2193 | }; |
| 2194 | |
| 2195 | static const struct nilfs_bmap_operations nilfs_btree_ops_gc = { |
| 2196 | .bop_lookup = NULL, |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 2197 | .bop_lookup_contig = NULL, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2198 | .bop_insert = NULL, |
| 2199 | .bop_delete = NULL, |
| 2200 | .bop_clear = NULL, |
| 2201 | |
| 2202 | .bop_propagate = nilfs_btree_propagate_gc, |
| 2203 | |
| 2204 | .bop_lookup_dirty_buffers = nilfs_btree_lookup_dirty_buffers, |
| 2205 | |
| 2206 | .bop_assign = nilfs_btree_assign_gc, |
| 2207 | .bop_mark = NULL, |
| 2208 | |
| 2209 | .bop_last_key = NULL, |
| 2210 | .bop_check_insert = NULL, |
| 2211 | .bop_check_delete = NULL, |
| 2212 | .bop_gather_data = NULL, |
| 2213 | }; |
| 2214 | |
Ryusuke Konishi | 3033342 | 2009-05-24 00:09:44 +0900 | [diff] [blame] | 2215 | int nilfs_btree_init(struct nilfs_bmap *bmap) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2216 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2217 | bmap->b_ops = &nilfs_btree_ops; |
Ryusuke Konishi | 5ad2686e9 | 2010-07-13 23:33:54 +0900 | [diff] [blame] | 2218 | bmap->b_nchildren_per_block = |
| 2219 | NILFS_BTREE_NODE_NCHILDREN_MAX(nilfs_btree_node_size(bmap)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2220 | return 0; |
| 2221 | } |
| 2222 | |
| 2223 | void nilfs_btree_init_gc(struct nilfs_bmap *bmap) |
| 2224 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2225 | bmap->b_ops = &nilfs_btree_ops_gc; |
Ryusuke Konishi | 5ad2686e9 | 2010-07-13 23:33:54 +0900 | [diff] [blame] | 2226 | bmap->b_nchildren_per_block = |
| 2227 | NILFS_BTREE_NODE_NCHILDREN_MAX(nilfs_btree_node_size(bmap)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2228 | } |