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