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 | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 69 | static int nilfs_btree_get_block(const struct nilfs_btree *btree, __u64 ptr, |
| 70 | struct buffer_head **bhp) |
| 71 | { |
| 72 | struct address_space *btnc = |
| 73 | &NILFS_BMAP_I((struct nilfs_bmap *)btree)->i_btnode_cache; |
Ryusuke Konishi | 1d5385b | 2010-07-16 23:52:40 +0900 | [diff] [blame^] | 74 | struct buffer_head *bh; |
Ryusuke Konishi | 1376e93 | 2009-11-13 16:49:09 +0900 | [diff] [blame] | 75 | int err; |
| 76 | |
| 77 | err = nilfs_btnode_submit_block(btnc, ptr, 0, bhp); |
| 78 | if (err) |
| 79 | return err == -EEXIST ? 0 : err; |
| 80 | |
Ryusuke Konishi | 1d5385b | 2010-07-16 23:52:40 +0900 | [diff] [blame^] | 81 | bh = *bhp; |
| 82 | wait_on_buffer(bh); |
| 83 | if (!buffer_uptodate(bh)) { |
| 84 | brelse(bh); |
Ryusuke Konishi | 1376e93 | 2009-11-13 16:49:09 +0900 | [diff] [blame] | 85 | return -EIO; |
| 86 | } |
Ryusuke Konishi | 1d5385b | 2010-07-16 23:52:40 +0900 | [diff] [blame^] | 87 | if (nilfs_btree_broken_node_block(bh)) { |
| 88 | clear_buffer_uptodate(bh); |
| 89 | brelse(bh); |
| 90 | return -EINVAL; |
| 91 | } |
Ryusuke Konishi | 1376e93 | 2009-11-13 16:49:09 +0900 | [diff] [blame] | 92 | return 0; |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 93 | } |
| 94 | |
| 95 | static int nilfs_btree_get_new_block(const struct nilfs_btree *btree, |
| 96 | __u64 ptr, struct buffer_head **bhp) |
| 97 | { |
| 98 | struct address_space *btnc = |
| 99 | &NILFS_BMAP_I((struct nilfs_bmap *)btree)->i_btnode_cache; |
Ryusuke Konishi | 45f4910 | 2009-11-13 16:25:19 +0900 | [diff] [blame] | 100 | struct buffer_head *bh; |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 101 | |
Ryusuke Konishi | 45f4910 | 2009-11-13 16:25:19 +0900 | [diff] [blame] | 102 | bh = nilfs_btnode_create_block(btnc, ptr); |
| 103 | if (!bh) |
| 104 | return -ENOMEM; |
| 105 | |
| 106 | set_buffer_nilfs_volatile(bh); |
| 107 | *bhp = bh; |
| 108 | return 0; |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 109 | } |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 110 | |
| 111 | static inline int |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 112 | nilfs_btree_node_get_flags(const struct nilfs_btree_node *node) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 113 | { |
| 114 | return node->bn_flags; |
| 115 | } |
| 116 | |
| 117 | static inline void |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 118 | nilfs_btree_node_set_flags(struct nilfs_btree_node *node, int flags) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 119 | { |
| 120 | node->bn_flags = flags; |
| 121 | } |
| 122 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 123 | 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] | 124 | { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 125 | return nilfs_btree_node_get_flags(node) & NILFS_BTREE_NODE_ROOT; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 126 | } |
| 127 | |
| 128 | static inline int |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 129 | nilfs_btree_node_get_level(const struct nilfs_btree_node *node) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 130 | { |
| 131 | return node->bn_level; |
| 132 | } |
| 133 | |
| 134 | static inline void |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 135 | nilfs_btree_node_set_level(struct nilfs_btree_node *node, int level) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 136 | { |
| 137 | node->bn_level = level; |
| 138 | } |
| 139 | |
| 140 | static inline int |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 141 | nilfs_btree_node_get_nchildren(const struct nilfs_btree_node *node) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 142 | { |
| 143 | return le16_to_cpu(node->bn_nchildren); |
| 144 | } |
| 145 | |
| 146 | static inline void |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 147 | nilfs_btree_node_set_nchildren(struct nilfs_btree_node *node, int nchildren) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 148 | { |
| 149 | node->bn_nchildren = cpu_to_le16(nchildren); |
| 150 | } |
| 151 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 152 | static inline int nilfs_btree_node_size(const struct nilfs_btree *btree) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 153 | { |
| 154 | return 1 << btree->bt_bmap.b_inode->i_blkbits; |
| 155 | } |
| 156 | |
| 157 | static inline int |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 158 | nilfs_btree_node_nchildren_min(const struct nilfs_btree_node *node, |
| 159 | const struct nilfs_btree *btree) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 160 | { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 161 | return nilfs_btree_node_root(node) ? |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 162 | NILFS_BTREE_ROOT_NCHILDREN_MIN : |
| 163 | NILFS_BTREE_NODE_NCHILDREN_MIN(nilfs_btree_node_size(btree)); |
| 164 | } |
| 165 | |
| 166 | static inline int |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 167 | nilfs_btree_node_nchildren_max(const struct nilfs_btree_node *node, |
| 168 | const struct nilfs_btree *btree) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 169 | { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 170 | return nilfs_btree_node_root(node) ? |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 171 | NILFS_BTREE_ROOT_NCHILDREN_MAX : |
| 172 | NILFS_BTREE_NODE_NCHILDREN_MAX(nilfs_btree_node_size(btree)); |
| 173 | } |
| 174 | |
| 175 | static inline __le64 * |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 176 | nilfs_btree_node_dkeys(const struct nilfs_btree_node *node) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 177 | { |
| 178 | return (__le64 *)((char *)(node + 1) + |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 179 | (nilfs_btree_node_root(node) ? |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 180 | 0 : NILFS_BTREE_NODE_EXTRA_PAD_SIZE)); |
| 181 | } |
| 182 | |
| 183 | static inline __le64 * |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 184 | nilfs_btree_node_dptrs(const struct nilfs_btree_node *node, |
| 185 | const struct nilfs_btree *btree) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 186 | { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 187 | return (__le64 *)(nilfs_btree_node_dkeys(node) + |
| 188 | nilfs_btree_node_nchildren_max(node, btree)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 189 | } |
| 190 | |
| 191 | static inline __u64 |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 192 | 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] | 193 | { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 194 | return nilfs_bmap_dkey_to_key(*(nilfs_btree_node_dkeys(node) + index)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 195 | } |
| 196 | |
| 197 | static inline void |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 198 | 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] | 199 | { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 200 | *(nilfs_btree_node_dkeys(node) + index) = nilfs_bmap_key_to_dkey(key); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 201 | } |
| 202 | |
| 203 | static inline __u64 |
| 204 | nilfs_btree_node_get_ptr(const struct nilfs_btree *btree, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 205 | const struct nilfs_btree_node *node, int index) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 206 | { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 207 | return nilfs_bmap_dptr_to_ptr(*(nilfs_btree_node_dptrs(node, btree) + |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 208 | index)); |
| 209 | } |
| 210 | |
| 211 | static inline void |
| 212 | nilfs_btree_node_set_ptr(struct nilfs_btree *btree, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 213 | struct nilfs_btree_node *node, int index, __u64 ptr) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 214 | { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 215 | *(nilfs_btree_node_dptrs(node, btree) + index) = |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 216 | nilfs_bmap_ptr_to_dptr(ptr); |
| 217 | } |
| 218 | |
| 219 | static void nilfs_btree_node_init(struct nilfs_btree *btree, |
| 220 | struct nilfs_btree_node *node, |
| 221 | int flags, int level, int nchildren, |
| 222 | const __u64 *keys, const __u64 *ptrs) |
| 223 | { |
| 224 | __le64 *dkeys; |
| 225 | __le64 *dptrs; |
| 226 | int i; |
| 227 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 228 | nilfs_btree_node_set_flags(node, flags); |
| 229 | nilfs_btree_node_set_level(node, level); |
| 230 | nilfs_btree_node_set_nchildren(node, nchildren); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 231 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 232 | dkeys = nilfs_btree_node_dkeys(node); |
| 233 | dptrs = nilfs_btree_node_dptrs(node, btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 234 | for (i = 0; i < nchildren; i++) { |
| 235 | dkeys[i] = nilfs_bmap_key_to_dkey(keys[i]); |
| 236 | dptrs[i] = nilfs_bmap_ptr_to_dptr(ptrs[i]); |
| 237 | } |
| 238 | } |
| 239 | |
| 240 | /* Assume the buffer heads corresponding to left and right are locked. */ |
| 241 | static void nilfs_btree_node_move_left(struct nilfs_btree *btree, |
| 242 | struct nilfs_btree_node *left, |
| 243 | struct nilfs_btree_node *right, |
| 244 | int n) |
| 245 | { |
| 246 | __le64 *ldkeys, *rdkeys; |
| 247 | __le64 *ldptrs, *rdptrs; |
| 248 | int lnchildren, rnchildren; |
| 249 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 250 | ldkeys = nilfs_btree_node_dkeys(left); |
| 251 | ldptrs = nilfs_btree_node_dptrs(left, btree); |
| 252 | lnchildren = nilfs_btree_node_get_nchildren(left); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 253 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 254 | rdkeys = nilfs_btree_node_dkeys(right); |
| 255 | rdptrs = nilfs_btree_node_dptrs(right, btree); |
| 256 | rnchildren = nilfs_btree_node_get_nchildren(right); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 257 | |
| 258 | memcpy(ldkeys + lnchildren, rdkeys, n * sizeof(*rdkeys)); |
| 259 | memcpy(ldptrs + lnchildren, rdptrs, n * sizeof(*rdptrs)); |
| 260 | memmove(rdkeys, rdkeys + n, (rnchildren - n) * sizeof(*rdkeys)); |
| 261 | memmove(rdptrs, rdptrs + n, (rnchildren - n) * sizeof(*rdptrs)); |
| 262 | |
| 263 | lnchildren += n; |
| 264 | rnchildren -= n; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 265 | nilfs_btree_node_set_nchildren(left, lnchildren); |
| 266 | nilfs_btree_node_set_nchildren(right, rnchildren); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 267 | } |
| 268 | |
| 269 | /* Assume that the buffer heads corresponding to left and right are locked. */ |
| 270 | static void nilfs_btree_node_move_right(struct nilfs_btree *btree, |
| 271 | struct nilfs_btree_node *left, |
| 272 | struct nilfs_btree_node *right, |
| 273 | int n) |
| 274 | { |
| 275 | __le64 *ldkeys, *rdkeys; |
| 276 | __le64 *ldptrs, *rdptrs; |
| 277 | int lnchildren, rnchildren; |
| 278 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 279 | ldkeys = nilfs_btree_node_dkeys(left); |
| 280 | ldptrs = nilfs_btree_node_dptrs(left, btree); |
| 281 | lnchildren = nilfs_btree_node_get_nchildren(left); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 282 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 283 | rdkeys = nilfs_btree_node_dkeys(right); |
| 284 | rdptrs = nilfs_btree_node_dptrs(right, btree); |
| 285 | rnchildren = nilfs_btree_node_get_nchildren(right); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 286 | |
| 287 | memmove(rdkeys + n, rdkeys, rnchildren * sizeof(*rdkeys)); |
| 288 | memmove(rdptrs + n, rdptrs, rnchildren * sizeof(*rdptrs)); |
| 289 | memcpy(rdkeys, ldkeys + lnchildren - n, n * sizeof(*rdkeys)); |
| 290 | memcpy(rdptrs, ldptrs + lnchildren - n, n * sizeof(*rdptrs)); |
| 291 | |
| 292 | lnchildren -= n; |
| 293 | rnchildren += n; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 294 | nilfs_btree_node_set_nchildren(left, lnchildren); |
| 295 | nilfs_btree_node_set_nchildren(right, rnchildren); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 296 | } |
| 297 | |
| 298 | /* Assume that the buffer head corresponding to node is locked. */ |
| 299 | static void nilfs_btree_node_insert(struct nilfs_btree *btree, |
| 300 | struct nilfs_btree_node *node, |
| 301 | __u64 key, __u64 ptr, int index) |
| 302 | { |
| 303 | __le64 *dkeys; |
| 304 | __le64 *dptrs; |
| 305 | int nchildren; |
| 306 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 307 | dkeys = nilfs_btree_node_dkeys(node); |
| 308 | dptrs = nilfs_btree_node_dptrs(node, btree); |
| 309 | nchildren = nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 310 | if (index < nchildren) { |
| 311 | memmove(dkeys + index + 1, dkeys + index, |
| 312 | (nchildren - index) * sizeof(*dkeys)); |
| 313 | memmove(dptrs + index + 1, dptrs + index, |
| 314 | (nchildren - index) * sizeof(*dptrs)); |
| 315 | } |
| 316 | dkeys[index] = nilfs_bmap_key_to_dkey(key); |
| 317 | dptrs[index] = nilfs_bmap_ptr_to_dptr(ptr); |
| 318 | nchildren++; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 319 | nilfs_btree_node_set_nchildren(node, nchildren); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 320 | } |
| 321 | |
| 322 | /* Assume that the buffer head corresponding to node is locked. */ |
| 323 | static void nilfs_btree_node_delete(struct nilfs_btree *btree, |
| 324 | struct nilfs_btree_node *node, |
| 325 | __u64 *keyp, __u64 *ptrp, int index) |
| 326 | { |
| 327 | __u64 key; |
| 328 | __u64 ptr; |
| 329 | __le64 *dkeys; |
| 330 | __le64 *dptrs; |
| 331 | int nchildren; |
| 332 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 333 | dkeys = nilfs_btree_node_dkeys(node); |
| 334 | dptrs = nilfs_btree_node_dptrs(node, btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 335 | key = nilfs_bmap_dkey_to_key(dkeys[index]); |
| 336 | ptr = nilfs_bmap_dptr_to_ptr(dptrs[index]); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 337 | nchildren = nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 338 | if (keyp != NULL) |
| 339 | *keyp = key; |
| 340 | if (ptrp != NULL) |
| 341 | *ptrp = ptr; |
| 342 | |
| 343 | if (index < nchildren - 1) { |
| 344 | memmove(dkeys + index, dkeys + index + 1, |
| 345 | (nchildren - index - 1) * sizeof(*dkeys)); |
| 346 | memmove(dptrs + index, dptrs + index + 1, |
| 347 | (nchildren - index - 1) * sizeof(*dptrs)); |
| 348 | } |
| 349 | nchildren--; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 350 | nilfs_btree_node_set_nchildren(node, nchildren); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 351 | } |
| 352 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 353 | static int nilfs_btree_node_lookup(const struct nilfs_btree_node *node, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 354 | __u64 key, int *indexp) |
| 355 | { |
| 356 | __u64 nkey; |
| 357 | int index, low, high, s; |
| 358 | |
| 359 | /* binary search */ |
| 360 | low = 0; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 361 | high = nilfs_btree_node_get_nchildren(node) - 1; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 362 | index = 0; |
| 363 | s = 0; |
| 364 | while (low <= high) { |
| 365 | index = (low + high) / 2; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 366 | nkey = nilfs_btree_node_get_key(node, index); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 367 | if (nkey == key) { |
| 368 | s = 0; |
| 369 | goto out; |
| 370 | } else if (nkey < key) { |
| 371 | low = index + 1; |
| 372 | s = -1; |
| 373 | } else { |
| 374 | high = index - 1; |
| 375 | s = 1; |
| 376 | } |
| 377 | } |
| 378 | |
| 379 | /* adjust index */ |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 380 | if (nilfs_btree_node_get_level(node) > NILFS_BTREE_LEVEL_NODE_MIN) { |
| 381 | if (s > 0 && index > 0) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 382 | index--; |
| 383 | } else if (s < 0) |
| 384 | index++; |
| 385 | |
| 386 | out: |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 387 | *indexp = index; |
| 388 | |
| 389 | return s == 0; |
| 390 | } |
| 391 | |
Ryusuke Konishi | 1d5385b | 2010-07-16 23:52:40 +0900 | [diff] [blame^] | 392 | /** |
| 393 | * nilfs_btree_node_broken - verify consistency of btree node |
| 394 | * @node: btree node block to be examined |
| 395 | * @size: node size (in bytes) |
| 396 | * @blocknr: block number |
| 397 | * |
| 398 | * Return Value: If node is broken, 1 is returned. Otherwise, 0 is returned. |
| 399 | */ |
| 400 | static int nilfs_btree_node_broken(const struct nilfs_btree_node *node, |
| 401 | size_t size, sector_t blocknr) |
| 402 | { |
| 403 | int level, flags, nchildren; |
| 404 | int ret = 0; |
| 405 | |
| 406 | level = nilfs_btree_node_get_level(node); |
| 407 | flags = nilfs_btree_node_get_flags(node); |
| 408 | nchildren = nilfs_btree_node_get_nchildren(node); |
| 409 | |
| 410 | if (unlikely(level < NILFS_BTREE_LEVEL_NODE_MIN || |
| 411 | level >= NILFS_BTREE_LEVEL_MAX || |
| 412 | (flags & NILFS_BTREE_NODE_ROOT) || |
| 413 | nchildren < 0 || |
| 414 | nchildren > NILFS_BTREE_NODE_NCHILDREN_MAX(size))) { |
| 415 | printk(KERN_CRIT "NILFS: bad btree node (blocknr=%llu): " |
| 416 | "level = %d, flags = 0x%x, nchildren = %d\n", |
| 417 | (unsigned long long)blocknr, level, flags, nchildren); |
| 418 | ret = 1; |
| 419 | } |
| 420 | return ret; |
| 421 | } |
| 422 | |
| 423 | int nilfs_btree_broken_node_block(struct buffer_head *bh) |
| 424 | { |
| 425 | return nilfs_btree_node_broken((struct nilfs_btree_node *)bh->b_data, |
| 426 | bh->b_size, bh->b_blocknr); |
| 427 | } |
| 428 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 429 | static inline struct nilfs_btree_node * |
| 430 | nilfs_btree_get_root(const struct nilfs_btree *btree) |
| 431 | { |
| 432 | return (struct nilfs_btree_node *)btree->bt_bmap.b_u.u_data; |
| 433 | } |
| 434 | |
| 435 | static inline struct nilfs_btree_node * |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 436 | 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] | 437 | { |
| 438 | return (struct nilfs_btree_node *)path[level].bp_bh->b_data; |
| 439 | } |
| 440 | |
| 441 | static inline struct nilfs_btree_node * |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 442 | 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] | 443 | { |
| 444 | return (struct nilfs_btree_node *)path[level].bp_sib_bh->b_data; |
| 445 | } |
| 446 | |
| 447 | static inline int nilfs_btree_height(const struct nilfs_btree *btree) |
| 448 | { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 449 | return nilfs_btree_node_get_level(nilfs_btree_get_root(btree)) + 1; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 450 | } |
| 451 | |
| 452 | static inline struct nilfs_btree_node * |
| 453 | nilfs_btree_get_node(const struct nilfs_btree *btree, |
| 454 | const struct nilfs_btree_path *path, |
| 455 | int level) |
| 456 | { |
| 457 | return (level == nilfs_btree_height(btree) - 1) ? |
| 458 | nilfs_btree_get_root(btree) : |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 459 | nilfs_btree_get_nonroot_node(path, level); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 460 | } |
| 461 | |
Ryusuke Konishi | 9b945d5 | 2009-10-10 22:58:10 +0900 | [diff] [blame] | 462 | static inline int |
| 463 | nilfs_btree_bad_node(struct nilfs_btree_node *node, int level) |
| 464 | { |
| 465 | if (unlikely(nilfs_btree_node_get_level(node) != level)) { |
| 466 | dump_stack(); |
| 467 | printk(KERN_CRIT "NILFS: btree level mismatch: %d != %d\n", |
| 468 | nilfs_btree_node_get_level(node), level); |
| 469 | return 1; |
| 470 | } |
| 471 | return 0; |
| 472 | } |
| 473 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 474 | static int nilfs_btree_do_lookup(const struct nilfs_btree *btree, |
| 475 | struct nilfs_btree_path *path, |
| 476 | __u64 key, __u64 *ptrp, int minlevel) |
| 477 | { |
| 478 | struct nilfs_btree_node *node; |
| 479 | __u64 ptr; |
| 480 | int level, index, found, ret; |
| 481 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 482 | node = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 483 | level = nilfs_btree_node_get_level(node); |
| 484 | if (level < minlevel || nilfs_btree_node_get_nchildren(node) <= 0) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 485 | return -ENOENT; |
| 486 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 487 | found = nilfs_btree_node_lookup(node, key, &index); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 488 | ptr = nilfs_btree_node_get_ptr(btree, node, index); |
| 489 | path[level].bp_bh = NULL; |
| 490 | path[level].bp_index = index; |
| 491 | |
| 492 | for (level--; level >= minlevel; level--) { |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 493 | ret = nilfs_btree_get_block(btree, ptr, &path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 494 | if (ret < 0) |
| 495 | return ret; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 496 | node = nilfs_btree_get_nonroot_node(path, level); |
Ryusuke Konishi | 9b945d5 | 2009-10-10 22:58:10 +0900 | [diff] [blame] | 497 | if (nilfs_btree_bad_node(node, level)) |
| 498 | return -EINVAL; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 499 | if (!found) |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 500 | found = nilfs_btree_node_lookup(node, key, &index); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 501 | else |
| 502 | index = 0; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 503 | if (index < nilfs_btree_node_nchildren_max(node, btree)) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 504 | ptr = nilfs_btree_node_get_ptr(btree, node, index); |
| 505 | else { |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 506 | WARN_ON(found || level != NILFS_BTREE_LEVEL_NODE_MIN); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 507 | /* insert */ |
| 508 | ptr = NILFS_BMAP_INVALID_PTR; |
| 509 | } |
| 510 | path[level].bp_index = index; |
| 511 | } |
| 512 | if (!found) |
| 513 | return -ENOENT; |
| 514 | |
| 515 | if (ptrp != NULL) |
| 516 | *ptrp = ptr; |
| 517 | |
| 518 | return 0; |
| 519 | } |
| 520 | |
| 521 | static int nilfs_btree_do_lookup_last(const struct nilfs_btree *btree, |
| 522 | struct nilfs_btree_path *path, |
| 523 | __u64 *keyp, __u64 *ptrp) |
| 524 | { |
| 525 | struct nilfs_btree_node *node; |
| 526 | __u64 ptr; |
| 527 | int index, level, ret; |
| 528 | |
| 529 | node = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 530 | index = nilfs_btree_node_get_nchildren(node) - 1; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 531 | if (index < 0) |
| 532 | return -ENOENT; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 533 | level = nilfs_btree_node_get_level(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 534 | ptr = nilfs_btree_node_get_ptr(btree, node, index); |
| 535 | path[level].bp_bh = NULL; |
| 536 | path[level].bp_index = index; |
| 537 | |
| 538 | for (level--; level > 0; level--) { |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 539 | ret = nilfs_btree_get_block(btree, ptr, &path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 540 | if (ret < 0) |
| 541 | return ret; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 542 | node = nilfs_btree_get_nonroot_node(path, level); |
Ryusuke Konishi | 9b945d5 | 2009-10-10 22:58:10 +0900 | [diff] [blame] | 543 | if (nilfs_btree_bad_node(node, level)) |
| 544 | return -EINVAL; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 545 | index = nilfs_btree_node_get_nchildren(node) - 1; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 546 | ptr = nilfs_btree_node_get_ptr(btree, node, index); |
| 547 | path[level].bp_index = index; |
| 548 | } |
| 549 | |
| 550 | if (keyp != NULL) |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 551 | *keyp = nilfs_btree_node_get_key(node, index); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 552 | if (ptrp != NULL) |
| 553 | *ptrp = ptr; |
| 554 | |
| 555 | return 0; |
| 556 | } |
| 557 | |
| 558 | static int nilfs_btree_lookup(const struct nilfs_bmap *bmap, |
| 559 | __u64 key, int level, __u64 *ptrp) |
| 560 | { |
| 561 | struct nilfs_btree *btree; |
| 562 | struct nilfs_btree_path *path; |
| 563 | __u64 ptr; |
| 564 | int ret; |
| 565 | |
| 566 | btree = (struct nilfs_btree *)bmap; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 567 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 568 | if (path == NULL) |
| 569 | return -ENOMEM; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 570 | |
| 571 | ret = nilfs_btree_do_lookup(btree, path, key, &ptr, level); |
| 572 | |
| 573 | if (ptrp != NULL) |
| 574 | *ptrp = ptr; |
| 575 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 576 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 577 | |
| 578 | return ret; |
| 579 | } |
| 580 | |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 581 | static int nilfs_btree_lookup_contig(const struct nilfs_bmap *bmap, |
| 582 | __u64 key, __u64 *ptrp, unsigned maxblocks) |
| 583 | { |
| 584 | struct nilfs_btree *btree = (struct nilfs_btree *)bmap; |
| 585 | struct nilfs_btree_path *path; |
| 586 | struct nilfs_btree_node *node; |
| 587 | struct inode *dat = NULL; |
| 588 | __u64 ptr, ptr2; |
| 589 | sector_t blocknr; |
| 590 | int level = NILFS_BTREE_LEVEL_NODE_MIN; |
| 591 | int ret, cnt, index, maxlevel; |
| 592 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 593 | path = nilfs_btree_alloc_path(); |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 594 | if (path == NULL) |
| 595 | return -ENOMEM; |
Li Hong | f905440 | 2010-04-02 17:36:34 +0800 | [diff] [blame] | 596 | |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 597 | ret = nilfs_btree_do_lookup(btree, path, key, &ptr, level); |
| 598 | if (ret < 0) |
| 599 | goto out; |
| 600 | |
| 601 | if (NILFS_BMAP_USE_VBN(bmap)) { |
| 602 | dat = nilfs_bmap_get_dat(bmap); |
| 603 | ret = nilfs_dat_translate(dat, ptr, &blocknr); |
| 604 | if (ret < 0) |
| 605 | goto out; |
| 606 | ptr = blocknr; |
| 607 | } |
| 608 | cnt = 1; |
| 609 | if (cnt == maxblocks) |
| 610 | goto end; |
| 611 | |
| 612 | maxlevel = nilfs_btree_height(btree) - 1; |
| 613 | node = nilfs_btree_get_node(btree, path, level); |
| 614 | index = path[level].bp_index + 1; |
| 615 | for (;;) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 616 | while (index < nilfs_btree_node_get_nchildren(node)) { |
| 617 | if (nilfs_btree_node_get_key(node, index) != |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 618 | key + cnt) |
| 619 | goto end; |
| 620 | ptr2 = nilfs_btree_node_get_ptr(btree, node, index); |
| 621 | if (dat) { |
| 622 | ret = nilfs_dat_translate(dat, ptr2, &blocknr); |
| 623 | if (ret < 0) |
| 624 | goto out; |
| 625 | ptr2 = blocknr; |
| 626 | } |
| 627 | if (ptr2 != ptr + cnt || ++cnt == maxblocks) |
| 628 | goto end; |
| 629 | index++; |
| 630 | continue; |
| 631 | } |
| 632 | if (level == maxlevel) |
| 633 | break; |
| 634 | |
| 635 | /* look-up right sibling node */ |
| 636 | node = nilfs_btree_get_node(btree, path, level + 1); |
| 637 | index = path[level + 1].bp_index + 1; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 638 | if (index >= nilfs_btree_node_get_nchildren(node) || |
| 639 | nilfs_btree_node_get_key(node, index) != key + cnt) |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 640 | break; |
| 641 | ptr2 = nilfs_btree_node_get_ptr(btree, node, index); |
| 642 | path[level + 1].bp_index = index; |
| 643 | |
| 644 | brelse(path[level].bp_bh); |
| 645 | path[level].bp_bh = NULL; |
| 646 | ret = nilfs_btree_get_block(btree, ptr2, &path[level].bp_bh); |
| 647 | if (ret < 0) |
| 648 | goto out; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 649 | node = nilfs_btree_get_nonroot_node(path, level); |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 650 | index = 0; |
| 651 | path[level].bp_index = index; |
| 652 | } |
| 653 | end: |
| 654 | *ptrp = ptr; |
| 655 | ret = cnt; |
| 656 | out: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 657 | nilfs_btree_free_path(path); |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 658 | return ret; |
| 659 | } |
| 660 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 661 | static void nilfs_btree_promote_key(struct nilfs_btree *btree, |
| 662 | struct nilfs_btree_path *path, |
| 663 | int level, __u64 key) |
| 664 | { |
| 665 | if (level < nilfs_btree_height(btree) - 1) { |
| 666 | do { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 667 | nilfs_btree_node_set_key( |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 668 | nilfs_btree_get_nonroot_node(path, level), |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 669 | path[level].bp_index, key); |
| 670 | if (!buffer_dirty(path[level].bp_bh)) |
| 671 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 672 | } while ((path[level].bp_index == 0) && |
| 673 | (++level < nilfs_btree_height(btree) - 1)); |
| 674 | } |
| 675 | |
| 676 | /* root */ |
| 677 | if (level == nilfs_btree_height(btree) - 1) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 678 | nilfs_btree_node_set_key(nilfs_btree_get_root(btree), |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 679 | path[level].bp_index, key); |
| 680 | } |
| 681 | } |
| 682 | |
| 683 | static void nilfs_btree_do_insert(struct nilfs_btree *btree, |
| 684 | struct nilfs_btree_path *path, |
| 685 | int level, __u64 *keyp, __u64 *ptrp) |
| 686 | { |
| 687 | struct nilfs_btree_node *node; |
| 688 | |
| 689 | if (level < nilfs_btree_height(btree) - 1) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 690 | node = nilfs_btree_get_nonroot_node(path, level); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 691 | nilfs_btree_node_insert(btree, node, *keyp, *ptrp, |
| 692 | path[level].bp_index); |
| 693 | if (!buffer_dirty(path[level].bp_bh)) |
| 694 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 695 | |
| 696 | if (path[level].bp_index == 0) |
| 697 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 698 | nilfs_btree_node_get_key(node, |
| 699 | 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 700 | } else { |
| 701 | node = nilfs_btree_get_root(btree); |
| 702 | nilfs_btree_node_insert(btree, node, *keyp, *ptrp, |
| 703 | path[level].bp_index); |
| 704 | } |
| 705 | } |
| 706 | |
| 707 | static void nilfs_btree_carry_left(struct nilfs_btree *btree, |
| 708 | struct nilfs_btree_path *path, |
| 709 | int level, __u64 *keyp, __u64 *ptrp) |
| 710 | { |
| 711 | struct nilfs_btree_node *node, *left; |
| 712 | int nchildren, lnchildren, n, move; |
| 713 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 714 | node = nilfs_btree_get_nonroot_node(path, level); |
| 715 | left = nilfs_btree_get_sib_node(path, level); |
| 716 | nchildren = nilfs_btree_node_get_nchildren(node); |
| 717 | lnchildren = nilfs_btree_node_get_nchildren(left); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 718 | move = 0; |
| 719 | |
| 720 | n = (nchildren + lnchildren + 1) / 2 - lnchildren; |
| 721 | if (n > path[level].bp_index) { |
| 722 | /* move insert point */ |
| 723 | n--; |
| 724 | move = 1; |
| 725 | } |
| 726 | |
| 727 | nilfs_btree_node_move_left(btree, left, node, n); |
| 728 | |
| 729 | if (!buffer_dirty(path[level].bp_bh)) |
| 730 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 731 | if (!buffer_dirty(path[level].bp_sib_bh)) |
| 732 | nilfs_btnode_mark_dirty(path[level].bp_sib_bh); |
| 733 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 734 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 735 | nilfs_btree_node_get_key(node, 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 736 | |
| 737 | if (move) { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 738 | brelse(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 739 | path[level].bp_bh = path[level].bp_sib_bh; |
| 740 | path[level].bp_sib_bh = NULL; |
| 741 | path[level].bp_index += lnchildren; |
| 742 | path[level + 1].bp_index--; |
| 743 | } else { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 744 | brelse(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 745 | path[level].bp_sib_bh = NULL; |
| 746 | path[level].bp_index -= n; |
| 747 | } |
| 748 | |
| 749 | nilfs_btree_do_insert(btree, path, level, keyp, ptrp); |
| 750 | } |
| 751 | |
| 752 | static void nilfs_btree_carry_right(struct nilfs_btree *btree, |
| 753 | struct nilfs_btree_path *path, |
| 754 | int level, __u64 *keyp, __u64 *ptrp) |
| 755 | { |
| 756 | struct nilfs_btree_node *node, *right; |
| 757 | int nchildren, rnchildren, n, move; |
| 758 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 759 | node = nilfs_btree_get_nonroot_node(path, level); |
| 760 | right = nilfs_btree_get_sib_node(path, level); |
| 761 | nchildren = nilfs_btree_node_get_nchildren(node); |
| 762 | rnchildren = nilfs_btree_node_get_nchildren(right); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 763 | move = 0; |
| 764 | |
| 765 | n = (nchildren + rnchildren + 1) / 2 - rnchildren; |
| 766 | if (n > nchildren - path[level].bp_index) { |
| 767 | /* move insert point */ |
| 768 | n--; |
| 769 | move = 1; |
| 770 | } |
| 771 | |
| 772 | nilfs_btree_node_move_right(btree, node, right, n); |
| 773 | |
| 774 | if (!buffer_dirty(path[level].bp_bh)) |
| 775 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 776 | if (!buffer_dirty(path[level].bp_sib_bh)) |
| 777 | nilfs_btnode_mark_dirty(path[level].bp_sib_bh); |
| 778 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 779 | path[level + 1].bp_index++; |
| 780 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 781 | nilfs_btree_node_get_key(right, 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 782 | path[level + 1].bp_index--; |
| 783 | |
| 784 | if (move) { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 785 | brelse(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 786 | path[level].bp_bh = path[level].bp_sib_bh; |
| 787 | path[level].bp_sib_bh = NULL; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 788 | path[level].bp_index -= nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 789 | path[level + 1].bp_index++; |
| 790 | } else { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 791 | brelse(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 792 | path[level].bp_sib_bh = NULL; |
| 793 | } |
| 794 | |
| 795 | nilfs_btree_do_insert(btree, path, level, keyp, ptrp); |
| 796 | } |
| 797 | |
| 798 | static void nilfs_btree_split(struct nilfs_btree *btree, |
| 799 | struct nilfs_btree_path *path, |
| 800 | int level, __u64 *keyp, __u64 *ptrp) |
| 801 | { |
| 802 | struct nilfs_btree_node *node, *right; |
| 803 | __u64 newkey; |
| 804 | __u64 newptr; |
| 805 | int nchildren, n, move; |
| 806 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 807 | node = nilfs_btree_get_nonroot_node(path, level); |
| 808 | right = nilfs_btree_get_sib_node(path, level); |
| 809 | nchildren = nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 810 | move = 0; |
| 811 | |
| 812 | n = (nchildren + 1) / 2; |
| 813 | if (n > nchildren - path[level].bp_index) { |
| 814 | n--; |
| 815 | move = 1; |
| 816 | } |
| 817 | |
| 818 | nilfs_btree_node_move_right(btree, node, right, n); |
| 819 | |
| 820 | if (!buffer_dirty(path[level].bp_bh)) |
| 821 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 822 | if (!buffer_dirty(path[level].bp_sib_bh)) |
| 823 | nilfs_btnode_mark_dirty(path[level].bp_sib_bh); |
| 824 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 825 | newkey = nilfs_btree_node_get_key(right, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 826 | newptr = path[level].bp_newreq.bpr_ptr; |
| 827 | |
| 828 | if (move) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 829 | path[level].bp_index -= nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 830 | nilfs_btree_node_insert(btree, right, *keyp, *ptrp, |
| 831 | path[level].bp_index); |
| 832 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 833 | *keyp = nilfs_btree_node_get_key(right, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 834 | *ptrp = path[level].bp_newreq.bpr_ptr; |
| 835 | |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 836 | brelse(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 837 | path[level].bp_bh = path[level].bp_sib_bh; |
| 838 | path[level].bp_sib_bh = NULL; |
| 839 | } else { |
| 840 | nilfs_btree_do_insert(btree, path, level, keyp, ptrp); |
| 841 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 842 | *keyp = nilfs_btree_node_get_key(right, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 843 | *ptrp = path[level].bp_newreq.bpr_ptr; |
| 844 | |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 845 | brelse(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 846 | path[level].bp_sib_bh = NULL; |
| 847 | } |
| 848 | |
| 849 | path[level + 1].bp_index++; |
| 850 | } |
| 851 | |
| 852 | static void nilfs_btree_grow(struct nilfs_btree *btree, |
| 853 | struct nilfs_btree_path *path, |
| 854 | int level, __u64 *keyp, __u64 *ptrp) |
| 855 | { |
| 856 | struct nilfs_btree_node *root, *child; |
| 857 | int n; |
| 858 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 859 | root = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 860 | child = nilfs_btree_get_sib_node(path, level); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 861 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 862 | n = nilfs_btree_node_get_nchildren(root); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 863 | |
| 864 | nilfs_btree_node_move_right(btree, root, child, n); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 865 | nilfs_btree_node_set_level(root, level + 1); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 866 | |
| 867 | if (!buffer_dirty(path[level].bp_sib_bh)) |
| 868 | nilfs_btnode_mark_dirty(path[level].bp_sib_bh); |
| 869 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 870 | path[level].bp_bh = path[level].bp_sib_bh; |
| 871 | path[level].bp_sib_bh = NULL; |
| 872 | |
| 873 | nilfs_btree_do_insert(btree, path, level, keyp, ptrp); |
| 874 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 875 | *keyp = nilfs_btree_node_get_key(child, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 876 | *ptrp = path[level].bp_newreq.bpr_ptr; |
| 877 | } |
| 878 | |
| 879 | static __u64 nilfs_btree_find_near(const struct nilfs_btree *btree, |
| 880 | const struct nilfs_btree_path *path) |
| 881 | { |
| 882 | struct nilfs_btree_node *node; |
| 883 | int level; |
| 884 | |
| 885 | if (path == NULL) |
| 886 | return NILFS_BMAP_INVALID_PTR; |
| 887 | |
| 888 | /* left sibling */ |
| 889 | level = NILFS_BTREE_LEVEL_NODE_MIN; |
| 890 | if (path[level].bp_index > 0) { |
| 891 | node = nilfs_btree_get_node(btree, path, level); |
| 892 | return nilfs_btree_node_get_ptr(btree, node, |
| 893 | path[level].bp_index - 1); |
| 894 | } |
| 895 | |
| 896 | /* parent */ |
| 897 | level = NILFS_BTREE_LEVEL_NODE_MIN + 1; |
| 898 | if (level <= nilfs_btree_height(btree) - 1) { |
| 899 | node = nilfs_btree_get_node(btree, path, level); |
| 900 | return nilfs_btree_node_get_ptr(btree, node, |
| 901 | path[level].bp_index); |
| 902 | } |
| 903 | |
| 904 | return NILFS_BMAP_INVALID_PTR; |
| 905 | } |
| 906 | |
| 907 | static __u64 nilfs_btree_find_target_v(const struct nilfs_btree *btree, |
| 908 | const struct nilfs_btree_path *path, |
| 909 | __u64 key) |
| 910 | { |
| 911 | __u64 ptr; |
| 912 | |
| 913 | ptr = nilfs_bmap_find_target_seq(&btree->bt_bmap, key); |
| 914 | if (ptr != NILFS_BMAP_INVALID_PTR) |
| 915 | /* sequential access */ |
| 916 | return ptr; |
| 917 | else { |
| 918 | ptr = nilfs_btree_find_near(btree, path); |
| 919 | if (ptr != NILFS_BMAP_INVALID_PTR) |
| 920 | /* near */ |
| 921 | return ptr; |
| 922 | } |
| 923 | /* block group */ |
| 924 | return nilfs_bmap_find_target_in_group(&btree->bt_bmap); |
| 925 | } |
| 926 | |
| 927 | static void nilfs_btree_set_target_v(struct nilfs_btree *btree, __u64 key, |
| 928 | __u64 ptr) |
| 929 | { |
| 930 | btree->bt_bmap.b_last_allocated_key = key; |
| 931 | btree->bt_bmap.b_last_allocated_ptr = ptr; |
| 932 | } |
| 933 | |
| 934 | static int nilfs_btree_prepare_insert(struct nilfs_btree *btree, |
| 935 | struct nilfs_btree_path *path, |
| 936 | int *levelp, __u64 key, __u64 ptr, |
| 937 | struct nilfs_bmap_stats *stats) |
| 938 | { |
| 939 | struct buffer_head *bh; |
| 940 | struct nilfs_btree_node *node, *parent, *sib; |
| 941 | __u64 sibptr; |
| 942 | int pindex, level, ret; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 943 | struct inode *dat = NULL; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 944 | |
| 945 | stats->bs_nblocks = 0; |
| 946 | level = NILFS_BTREE_LEVEL_DATA; |
| 947 | |
| 948 | /* allocate a new ptr for data block */ |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 949 | if (NILFS_BMAP_USE_VBN(&btree->bt_bmap)) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 950 | path[level].bp_newreq.bpr_ptr = |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 951 | nilfs_btree_find_target_v(btree, path, key); |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 952 | dat = nilfs_bmap_get_dat(&btree->bt_bmap); |
| 953 | } |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 954 | |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 955 | ret = nilfs_bmap_prepare_alloc_ptr(&btree->bt_bmap, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 956 | &path[level].bp_newreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 957 | if (ret < 0) |
| 958 | goto err_out_data; |
| 959 | |
| 960 | for (level = NILFS_BTREE_LEVEL_NODE_MIN; |
| 961 | level < nilfs_btree_height(btree) - 1; |
| 962 | level++) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 963 | node = nilfs_btree_get_nonroot_node(path, level); |
| 964 | if (nilfs_btree_node_get_nchildren(node) < |
| 965 | nilfs_btree_node_nchildren_max(node, btree)) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 966 | path[level].bp_op = nilfs_btree_do_insert; |
| 967 | stats->bs_nblocks++; |
| 968 | goto out; |
| 969 | } |
| 970 | |
| 971 | parent = nilfs_btree_get_node(btree, path, level + 1); |
| 972 | pindex = path[level + 1].bp_index; |
| 973 | |
| 974 | /* left sibling */ |
| 975 | if (pindex > 0) { |
| 976 | sibptr = nilfs_btree_node_get_ptr(btree, parent, |
| 977 | pindex - 1); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 978 | ret = nilfs_btree_get_block(btree, sibptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 979 | if (ret < 0) |
| 980 | goto err_out_child_node; |
| 981 | sib = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 982 | if (nilfs_btree_node_get_nchildren(sib) < |
| 983 | nilfs_btree_node_nchildren_max(sib, btree)) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 984 | path[level].bp_sib_bh = bh; |
| 985 | path[level].bp_op = nilfs_btree_carry_left; |
| 986 | stats->bs_nblocks++; |
| 987 | goto out; |
| 988 | } else |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 989 | brelse(bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 990 | } |
| 991 | |
| 992 | /* right sibling */ |
| 993 | if (pindex < |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 994 | nilfs_btree_node_get_nchildren(parent) - 1) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 995 | sibptr = nilfs_btree_node_get_ptr(btree, parent, |
| 996 | pindex + 1); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 997 | ret = nilfs_btree_get_block(btree, sibptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 998 | if (ret < 0) |
| 999 | goto err_out_child_node; |
| 1000 | sib = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1001 | if (nilfs_btree_node_get_nchildren(sib) < |
| 1002 | nilfs_btree_node_nchildren_max(sib, btree)) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1003 | path[level].bp_sib_bh = bh; |
| 1004 | path[level].bp_op = nilfs_btree_carry_right; |
| 1005 | stats->bs_nblocks++; |
| 1006 | goto out; |
| 1007 | } else |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1008 | brelse(bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1009 | } |
| 1010 | |
| 1011 | /* split */ |
| 1012 | path[level].bp_newreq.bpr_ptr = |
| 1013 | path[level - 1].bp_newreq.bpr_ptr + 1; |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1014 | ret = nilfs_bmap_prepare_alloc_ptr(&btree->bt_bmap, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1015 | &path[level].bp_newreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1016 | if (ret < 0) |
| 1017 | goto err_out_child_node; |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1018 | ret = nilfs_btree_get_new_block(btree, |
| 1019 | path[level].bp_newreq.bpr_ptr, |
| 1020 | &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1021 | if (ret < 0) |
| 1022 | goto err_out_curr_node; |
| 1023 | |
| 1024 | stats->bs_nblocks++; |
| 1025 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1026 | nilfs_btree_node_init(btree, |
| 1027 | (struct nilfs_btree_node *)bh->b_data, |
| 1028 | 0, level, 0, NULL, NULL); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1029 | path[level].bp_sib_bh = bh; |
| 1030 | path[level].bp_op = nilfs_btree_split; |
| 1031 | } |
| 1032 | |
| 1033 | /* root */ |
| 1034 | node = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1035 | if (nilfs_btree_node_get_nchildren(node) < |
| 1036 | nilfs_btree_node_nchildren_max(node, btree)) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1037 | path[level].bp_op = nilfs_btree_do_insert; |
| 1038 | stats->bs_nblocks++; |
| 1039 | goto out; |
| 1040 | } |
| 1041 | |
| 1042 | /* grow */ |
| 1043 | path[level].bp_newreq.bpr_ptr = path[level - 1].bp_newreq.bpr_ptr + 1; |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1044 | ret = nilfs_bmap_prepare_alloc_ptr(&btree->bt_bmap, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1045 | &path[level].bp_newreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1046 | if (ret < 0) |
| 1047 | goto err_out_child_node; |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1048 | ret = nilfs_btree_get_new_block(btree, path[level].bp_newreq.bpr_ptr, |
| 1049 | &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1050 | if (ret < 0) |
| 1051 | goto err_out_curr_node; |
| 1052 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1053 | nilfs_btree_node_init(btree, (struct nilfs_btree_node *)bh->b_data, |
| 1054 | 0, level, 0, NULL, NULL); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1055 | path[level].bp_sib_bh = bh; |
| 1056 | path[level].bp_op = nilfs_btree_grow; |
| 1057 | |
| 1058 | level++; |
| 1059 | path[level].bp_op = nilfs_btree_do_insert; |
| 1060 | |
| 1061 | /* a newly-created node block and a data block are added */ |
| 1062 | stats->bs_nblocks += 2; |
| 1063 | |
| 1064 | /* success */ |
| 1065 | out: |
| 1066 | *levelp = level; |
| 1067 | return ret; |
| 1068 | |
| 1069 | /* error */ |
| 1070 | err_out_curr_node: |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1071 | nilfs_bmap_abort_alloc_ptr(&btree->bt_bmap, &path[level].bp_newreq, |
| 1072 | dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1073 | err_out_child_node: |
| 1074 | for (level--; level > NILFS_BTREE_LEVEL_DATA; level--) { |
Ryusuke Konishi | 9f09890 | 2009-05-22 00:38:56 +0900 | [diff] [blame] | 1075 | nilfs_btnode_delete(path[level].bp_sib_bh); |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1076 | nilfs_bmap_abort_alloc_ptr(&btree->bt_bmap, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1077 | &path[level].bp_newreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1078 | |
| 1079 | } |
| 1080 | |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1081 | nilfs_bmap_abort_alloc_ptr(&btree->bt_bmap, &path[level].bp_newreq, |
| 1082 | dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1083 | err_out_data: |
| 1084 | *levelp = level; |
| 1085 | stats->bs_nblocks = 0; |
| 1086 | return ret; |
| 1087 | } |
| 1088 | |
| 1089 | static void nilfs_btree_commit_insert(struct nilfs_btree *btree, |
| 1090 | struct nilfs_btree_path *path, |
| 1091 | int maxlevel, __u64 key, __u64 ptr) |
| 1092 | { |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1093 | struct inode *dat = NULL; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1094 | int level; |
| 1095 | |
| 1096 | set_buffer_nilfs_volatile((struct buffer_head *)((unsigned long)ptr)); |
| 1097 | ptr = path[NILFS_BTREE_LEVEL_DATA].bp_newreq.bpr_ptr; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1098 | if (NILFS_BMAP_USE_VBN(&btree->bt_bmap)) { |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 1099 | nilfs_btree_set_target_v(btree, key, ptr); |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1100 | dat = nilfs_bmap_get_dat(&btree->bt_bmap); |
| 1101 | } |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1102 | |
| 1103 | for (level = NILFS_BTREE_LEVEL_NODE_MIN; level <= maxlevel; level++) { |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1104 | nilfs_bmap_commit_alloc_ptr(&btree->bt_bmap, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1105 | &path[level - 1].bp_newreq, dat); |
Pekka Enberg | 8acfbf0 | 2009-04-06 19:01:49 -0700 | [diff] [blame] | 1106 | path[level].bp_op(btree, path, level, &key, &ptr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1107 | } |
| 1108 | |
| 1109 | if (!nilfs_bmap_dirty(&btree->bt_bmap)) |
| 1110 | nilfs_bmap_set_dirty(&btree->bt_bmap); |
| 1111 | } |
| 1112 | |
| 1113 | static int nilfs_btree_insert(struct nilfs_bmap *bmap, __u64 key, __u64 ptr) |
| 1114 | { |
| 1115 | struct nilfs_btree *btree; |
| 1116 | struct nilfs_btree_path *path; |
| 1117 | struct nilfs_bmap_stats stats; |
| 1118 | int level, ret; |
| 1119 | |
| 1120 | btree = (struct nilfs_btree *)bmap; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1121 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1122 | if (path == NULL) |
| 1123 | return -ENOMEM; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1124 | |
| 1125 | ret = nilfs_btree_do_lookup(btree, path, key, NULL, |
| 1126 | NILFS_BTREE_LEVEL_NODE_MIN); |
| 1127 | if (ret != -ENOENT) { |
| 1128 | if (ret == 0) |
| 1129 | ret = -EEXIST; |
| 1130 | goto out; |
| 1131 | } |
| 1132 | |
| 1133 | ret = nilfs_btree_prepare_insert(btree, path, &level, key, ptr, &stats); |
| 1134 | if (ret < 0) |
| 1135 | goto out; |
| 1136 | nilfs_btree_commit_insert(btree, path, level, key, ptr); |
| 1137 | nilfs_bmap_add_blocks(bmap, stats.bs_nblocks); |
| 1138 | |
| 1139 | out: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1140 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1141 | return ret; |
| 1142 | } |
| 1143 | |
| 1144 | static void nilfs_btree_do_delete(struct nilfs_btree *btree, |
| 1145 | struct nilfs_btree_path *path, |
| 1146 | int level, __u64 *keyp, __u64 *ptrp) |
| 1147 | { |
| 1148 | struct nilfs_btree_node *node; |
| 1149 | |
| 1150 | if (level < nilfs_btree_height(btree) - 1) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1151 | node = nilfs_btree_get_nonroot_node(path, level); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1152 | nilfs_btree_node_delete(btree, node, keyp, ptrp, |
| 1153 | path[level].bp_index); |
| 1154 | if (!buffer_dirty(path[level].bp_bh)) |
| 1155 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1156 | if (path[level].bp_index == 0) |
| 1157 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1158 | nilfs_btree_node_get_key(node, 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1159 | } else { |
| 1160 | node = nilfs_btree_get_root(btree); |
| 1161 | nilfs_btree_node_delete(btree, node, keyp, ptrp, |
| 1162 | path[level].bp_index); |
| 1163 | } |
| 1164 | } |
| 1165 | |
| 1166 | static void nilfs_btree_borrow_left(struct nilfs_btree *btree, |
| 1167 | struct nilfs_btree_path *path, |
| 1168 | int level, __u64 *keyp, __u64 *ptrp) |
| 1169 | { |
| 1170 | struct nilfs_btree_node *node, *left; |
| 1171 | int nchildren, lnchildren, n; |
| 1172 | |
| 1173 | nilfs_btree_do_delete(btree, path, level, keyp, ptrp); |
| 1174 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1175 | node = nilfs_btree_get_nonroot_node(path, level); |
| 1176 | left = nilfs_btree_get_sib_node(path, level); |
| 1177 | nchildren = nilfs_btree_node_get_nchildren(node); |
| 1178 | lnchildren = nilfs_btree_node_get_nchildren(left); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1179 | |
| 1180 | n = (nchildren + lnchildren) / 2 - nchildren; |
| 1181 | |
| 1182 | nilfs_btree_node_move_right(btree, left, node, n); |
| 1183 | |
| 1184 | if (!buffer_dirty(path[level].bp_bh)) |
| 1185 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 1186 | if (!buffer_dirty(path[level].bp_sib_bh)) |
| 1187 | nilfs_btnode_mark_dirty(path[level].bp_sib_bh); |
| 1188 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1189 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1190 | nilfs_btree_node_get_key(node, 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1191 | |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1192 | brelse(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1193 | path[level].bp_sib_bh = NULL; |
| 1194 | path[level].bp_index += n; |
| 1195 | } |
| 1196 | |
| 1197 | static void nilfs_btree_borrow_right(struct nilfs_btree *btree, |
| 1198 | struct nilfs_btree_path *path, |
| 1199 | int level, __u64 *keyp, __u64 *ptrp) |
| 1200 | { |
| 1201 | struct nilfs_btree_node *node, *right; |
| 1202 | int nchildren, rnchildren, n; |
| 1203 | |
| 1204 | nilfs_btree_do_delete(btree, path, level, keyp, ptrp); |
| 1205 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1206 | node = nilfs_btree_get_nonroot_node(path, level); |
| 1207 | right = nilfs_btree_get_sib_node(path, level); |
| 1208 | nchildren = nilfs_btree_node_get_nchildren(node); |
| 1209 | rnchildren = nilfs_btree_node_get_nchildren(right); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1210 | |
| 1211 | n = (nchildren + rnchildren) / 2 - nchildren; |
| 1212 | |
| 1213 | nilfs_btree_node_move_left(btree, node, right, n); |
| 1214 | |
| 1215 | if (!buffer_dirty(path[level].bp_bh)) |
| 1216 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 1217 | if (!buffer_dirty(path[level].bp_sib_bh)) |
| 1218 | nilfs_btnode_mark_dirty(path[level].bp_sib_bh); |
| 1219 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1220 | path[level + 1].bp_index++; |
| 1221 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1222 | nilfs_btree_node_get_key(right, 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1223 | path[level + 1].bp_index--; |
| 1224 | |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1225 | brelse(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1226 | path[level].bp_sib_bh = NULL; |
| 1227 | } |
| 1228 | |
| 1229 | static void nilfs_btree_concat_left(struct nilfs_btree *btree, |
| 1230 | struct nilfs_btree_path *path, |
| 1231 | int level, __u64 *keyp, __u64 *ptrp) |
| 1232 | { |
| 1233 | struct nilfs_btree_node *node, *left; |
| 1234 | int n; |
| 1235 | |
| 1236 | nilfs_btree_do_delete(btree, path, level, keyp, ptrp); |
| 1237 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1238 | node = nilfs_btree_get_nonroot_node(path, level); |
| 1239 | left = nilfs_btree_get_sib_node(path, level); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1240 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1241 | n = nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1242 | |
| 1243 | nilfs_btree_node_move_left(btree, left, node, n); |
| 1244 | |
| 1245 | if (!buffer_dirty(path[level].bp_sib_bh)) |
| 1246 | nilfs_btnode_mark_dirty(path[level].bp_sib_bh); |
| 1247 | |
Ryusuke Konishi | 9f09890 | 2009-05-22 00:38:56 +0900 | [diff] [blame] | 1248 | nilfs_btnode_delete(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1249 | path[level].bp_bh = path[level].bp_sib_bh; |
| 1250 | path[level].bp_sib_bh = NULL; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1251 | path[level].bp_index += nilfs_btree_node_get_nchildren(left); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1252 | } |
| 1253 | |
| 1254 | static void nilfs_btree_concat_right(struct nilfs_btree *btree, |
| 1255 | struct nilfs_btree_path *path, |
| 1256 | int level, __u64 *keyp, __u64 *ptrp) |
| 1257 | { |
| 1258 | struct nilfs_btree_node *node, *right; |
| 1259 | int n; |
| 1260 | |
| 1261 | nilfs_btree_do_delete(btree, path, level, keyp, ptrp); |
| 1262 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1263 | node = nilfs_btree_get_nonroot_node(path, level); |
| 1264 | right = nilfs_btree_get_sib_node(path, level); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1265 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1266 | n = nilfs_btree_node_get_nchildren(right); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1267 | |
| 1268 | nilfs_btree_node_move_left(btree, node, right, n); |
| 1269 | |
| 1270 | if (!buffer_dirty(path[level].bp_bh)) |
| 1271 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 1272 | |
Ryusuke Konishi | 9f09890 | 2009-05-22 00:38:56 +0900 | [diff] [blame] | 1273 | nilfs_btnode_delete(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1274 | path[level].bp_sib_bh = NULL; |
| 1275 | path[level + 1].bp_index++; |
| 1276 | } |
| 1277 | |
| 1278 | static void nilfs_btree_shrink(struct nilfs_btree *btree, |
| 1279 | struct nilfs_btree_path *path, |
| 1280 | int level, __u64 *keyp, __u64 *ptrp) |
| 1281 | { |
| 1282 | struct nilfs_btree_node *root, *child; |
| 1283 | int n; |
| 1284 | |
| 1285 | nilfs_btree_do_delete(btree, path, level, keyp, ptrp); |
| 1286 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1287 | root = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1288 | child = nilfs_btree_get_nonroot_node(path, level); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1289 | |
| 1290 | nilfs_btree_node_delete(btree, root, NULL, NULL, 0); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1291 | nilfs_btree_node_set_level(root, level); |
| 1292 | n = nilfs_btree_node_get_nchildren(child); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1293 | nilfs_btree_node_move_left(btree, root, child, n); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1294 | |
Ryusuke Konishi | 9f09890 | 2009-05-22 00:38:56 +0900 | [diff] [blame] | 1295 | nilfs_btnode_delete(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1296 | path[level].bp_bh = NULL; |
| 1297 | } |
| 1298 | |
| 1299 | |
| 1300 | static int nilfs_btree_prepare_delete(struct nilfs_btree *btree, |
| 1301 | struct nilfs_btree_path *path, |
| 1302 | int *levelp, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1303 | struct nilfs_bmap_stats *stats, |
| 1304 | struct inode *dat) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1305 | { |
| 1306 | struct buffer_head *bh; |
| 1307 | struct nilfs_btree_node *node, *parent, *sib; |
| 1308 | __u64 sibptr; |
| 1309 | int pindex, level, ret; |
| 1310 | |
| 1311 | ret = 0; |
| 1312 | stats->bs_nblocks = 0; |
| 1313 | for (level = NILFS_BTREE_LEVEL_NODE_MIN; |
| 1314 | level < nilfs_btree_height(btree) - 1; |
| 1315 | level++) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1316 | node = nilfs_btree_get_nonroot_node(path, level); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1317 | path[level].bp_oldreq.bpr_ptr = |
| 1318 | nilfs_btree_node_get_ptr(btree, node, |
| 1319 | path[level].bp_index); |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1320 | ret = nilfs_bmap_prepare_end_ptr(&btree->bt_bmap, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1321 | &path[level].bp_oldreq, dat); |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1322 | if (ret < 0) |
| 1323 | goto err_out_child_node; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1324 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1325 | if (nilfs_btree_node_get_nchildren(node) > |
| 1326 | nilfs_btree_node_nchildren_min(node, btree)) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1327 | path[level].bp_op = nilfs_btree_do_delete; |
| 1328 | stats->bs_nblocks++; |
| 1329 | goto out; |
| 1330 | } |
| 1331 | |
| 1332 | parent = nilfs_btree_get_node(btree, path, level + 1); |
| 1333 | pindex = path[level + 1].bp_index; |
| 1334 | |
| 1335 | if (pindex > 0) { |
| 1336 | /* left sibling */ |
| 1337 | sibptr = nilfs_btree_node_get_ptr(btree, parent, |
| 1338 | pindex - 1); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1339 | ret = nilfs_btree_get_block(btree, sibptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1340 | if (ret < 0) |
| 1341 | goto err_out_curr_node; |
| 1342 | sib = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1343 | if (nilfs_btree_node_get_nchildren(sib) > |
| 1344 | nilfs_btree_node_nchildren_min(sib, btree)) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1345 | path[level].bp_sib_bh = bh; |
| 1346 | path[level].bp_op = nilfs_btree_borrow_left; |
| 1347 | stats->bs_nblocks++; |
| 1348 | goto out; |
| 1349 | } else { |
| 1350 | path[level].bp_sib_bh = bh; |
| 1351 | path[level].bp_op = nilfs_btree_concat_left; |
| 1352 | stats->bs_nblocks++; |
| 1353 | /* continue; */ |
| 1354 | } |
| 1355 | } else if (pindex < |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1356 | nilfs_btree_node_get_nchildren(parent) - 1) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1357 | /* right sibling */ |
| 1358 | sibptr = nilfs_btree_node_get_ptr(btree, parent, |
| 1359 | pindex + 1); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1360 | ret = nilfs_btree_get_block(btree, sibptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1361 | if (ret < 0) |
| 1362 | goto err_out_curr_node; |
| 1363 | sib = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1364 | if (nilfs_btree_node_get_nchildren(sib) > |
| 1365 | nilfs_btree_node_nchildren_min(sib, btree)) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1366 | path[level].bp_sib_bh = bh; |
| 1367 | path[level].bp_op = nilfs_btree_borrow_right; |
| 1368 | stats->bs_nblocks++; |
| 1369 | goto out; |
| 1370 | } else { |
| 1371 | path[level].bp_sib_bh = bh; |
| 1372 | path[level].bp_op = nilfs_btree_concat_right; |
| 1373 | stats->bs_nblocks++; |
| 1374 | /* continue; */ |
| 1375 | } |
| 1376 | } else { |
| 1377 | /* no siblings */ |
| 1378 | /* the only child of the root node */ |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1379 | WARN_ON(level != nilfs_btree_height(btree) - 2); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1380 | if (nilfs_btree_node_get_nchildren(node) - 1 <= |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1381 | NILFS_BTREE_ROOT_NCHILDREN_MAX) { |
| 1382 | path[level].bp_op = nilfs_btree_shrink; |
| 1383 | stats->bs_nblocks += 2; |
| 1384 | } else { |
| 1385 | path[level].bp_op = nilfs_btree_do_delete; |
| 1386 | stats->bs_nblocks++; |
| 1387 | } |
| 1388 | |
| 1389 | goto out; |
| 1390 | |
| 1391 | } |
| 1392 | } |
| 1393 | |
| 1394 | node = nilfs_btree_get_root(btree); |
| 1395 | path[level].bp_oldreq.bpr_ptr = |
| 1396 | nilfs_btree_node_get_ptr(btree, node, path[level].bp_index); |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1397 | |
| 1398 | ret = nilfs_bmap_prepare_end_ptr(&btree->bt_bmap, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1399 | &path[level].bp_oldreq, dat); |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1400 | if (ret < 0) |
| 1401 | goto err_out_child_node; |
| 1402 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1403 | /* child of the root node is deleted */ |
| 1404 | path[level].bp_op = nilfs_btree_do_delete; |
| 1405 | stats->bs_nblocks++; |
| 1406 | |
| 1407 | /* success */ |
| 1408 | out: |
| 1409 | *levelp = level; |
| 1410 | return ret; |
| 1411 | |
| 1412 | /* error */ |
| 1413 | err_out_curr_node: |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1414 | nilfs_bmap_abort_end_ptr(&btree->bt_bmap, &path[level].bp_oldreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1415 | err_out_child_node: |
| 1416 | for (level--; level >= NILFS_BTREE_LEVEL_NODE_MIN; level--) { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1417 | brelse(path[level].bp_sib_bh); |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1418 | nilfs_bmap_abort_end_ptr(&btree->bt_bmap, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1419 | &path[level].bp_oldreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1420 | } |
| 1421 | *levelp = level; |
| 1422 | stats->bs_nblocks = 0; |
| 1423 | return ret; |
| 1424 | } |
| 1425 | |
| 1426 | static void nilfs_btree_commit_delete(struct nilfs_btree *btree, |
| 1427 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1428 | int maxlevel, struct inode *dat) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1429 | { |
| 1430 | int level; |
| 1431 | |
| 1432 | for (level = NILFS_BTREE_LEVEL_NODE_MIN; level <= maxlevel; level++) { |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1433 | nilfs_bmap_commit_end_ptr(&btree->bt_bmap, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1434 | &path[level].bp_oldreq, dat); |
Pekka Enberg | 8acfbf0 | 2009-04-06 19:01:49 -0700 | [diff] [blame] | 1435 | path[level].bp_op(btree, path, level, NULL, NULL); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1436 | } |
| 1437 | |
| 1438 | if (!nilfs_bmap_dirty(&btree->bt_bmap)) |
| 1439 | nilfs_bmap_set_dirty(&btree->bt_bmap); |
| 1440 | } |
| 1441 | |
| 1442 | static int nilfs_btree_delete(struct nilfs_bmap *bmap, __u64 key) |
| 1443 | |
| 1444 | { |
| 1445 | struct nilfs_btree *btree; |
| 1446 | struct nilfs_btree_path *path; |
| 1447 | struct nilfs_bmap_stats stats; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1448 | struct inode *dat; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1449 | int level, ret; |
| 1450 | |
| 1451 | btree = (struct nilfs_btree *)bmap; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1452 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1453 | if (path == NULL) |
| 1454 | return -ENOMEM; |
Li Hong | f905440 | 2010-04-02 17:36:34 +0800 | [diff] [blame] | 1455 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1456 | ret = nilfs_btree_do_lookup(btree, path, key, NULL, |
| 1457 | NILFS_BTREE_LEVEL_NODE_MIN); |
| 1458 | if (ret < 0) |
| 1459 | goto out; |
| 1460 | |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1461 | |
| 1462 | dat = NILFS_BMAP_USE_VBN(&btree->bt_bmap) ? |
| 1463 | nilfs_bmap_get_dat(&btree->bt_bmap) : NULL; |
| 1464 | |
| 1465 | ret = nilfs_btree_prepare_delete(btree, path, &level, &stats, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1466 | if (ret < 0) |
| 1467 | goto out; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1468 | nilfs_btree_commit_delete(btree, path, level, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1469 | nilfs_bmap_sub_blocks(bmap, stats.bs_nblocks); |
| 1470 | |
| 1471 | out: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1472 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1473 | return ret; |
| 1474 | } |
| 1475 | |
| 1476 | static int nilfs_btree_last_key(const struct nilfs_bmap *bmap, __u64 *keyp) |
| 1477 | { |
| 1478 | struct nilfs_btree *btree; |
| 1479 | struct nilfs_btree_path *path; |
| 1480 | int ret; |
| 1481 | |
| 1482 | btree = (struct nilfs_btree *)bmap; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1483 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1484 | if (path == NULL) |
| 1485 | return -ENOMEM; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1486 | |
| 1487 | ret = nilfs_btree_do_lookup_last(btree, path, keyp, NULL); |
| 1488 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1489 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1490 | |
| 1491 | return ret; |
| 1492 | } |
| 1493 | |
| 1494 | static int nilfs_btree_check_delete(struct nilfs_bmap *bmap, __u64 key) |
| 1495 | { |
| 1496 | struct buffer_head *bh; |
| 1497 | struct nilfs_btree *btree; |
| 1498 | struct nilfs_btree_node *root, *node; |
| 1499 | __u64 maxkey, nextmaxkey; |
| 1500 | __u64 ptr; |
| 1501 | int nchildren, ret; |
| 1502 | |
| 1503 | btree = (struct nilfs_btree *)bmap; |
| 1504 | root = nilfs_btree_get_root(btree); |
| 1505 | switch (nilfs_btree_height(btree)) { |
| 1506 | case 2: |
| 1507 | bh = NULL; |
| 1508 | node = root; |
| 1509 | break; |
| 1510 | case 3: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1511 | nchildren = nilfs_btree_node_get_nchildren(root); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1512 | if (nchildren > 1) |
| 1513 | return 0; |
| 1514 | ptr = nilfs_btree_node_get_ptr(btree, root, nchildren - 1); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1515 | ret = nilfs_btree_get_block(btree, ptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1516 | if (ret < 0) |
| 1517 | return ret; |
| 1518 | node = (struct nilfs_btree_node *)bh->b_data; |
| 1519 | break; |
| 1520 | default: |
| 1521 | return 0; |
| 1522 | } |
| 1523 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1524 | nchildren = nilfs_btree_node_get_nchildren(node); |
| 1525 | maxkey = nilfs_btree_node_get_key(node, nchildren - 1); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1526 | nextmaxkey = (nchildren > 1) ? |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1527 | nilfs_btree_node_get_key(node, nchildren - 2) : 0; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1528 | if (bh != NULL) |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1529 | brelse(bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1530 | |
Ryusuke Konishi | 3033342 | 2009-05-24 00:09:44 +0900 | [diff] [blame] | 1531 | return (maxkey == key) && (nextmaxkey < NILFS_BMAP_LARGE_LOW); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1532 | } |
| 1533 | |
| 1534 | static int nilfs_btree_gather_data(struct nilfs_bmap *bmap, |
| 1535 | __u64 *keys, __u64 *ptrs, int nitems) |
| 1536 | { |
| 1537 | struct buffer_head *bh; |
| 1538 | struct nilfs_btree *btree; |
| 1539 | struct nilfs_btree_node *node, *root; |
| 1540 | __le64 *dkeys; |
| 1541 | __le64 *dptrs; |
| 1542 | __u64 ptr; |
| 1543 | int nchildren, i, ret; |
| 1544 | |
| 1545 | btree = (struct nilfs_btree *)bmap; |
| 1546 | root = nilfs_btree_get_root(btree); |
| 1547 | switch (nilfs_btree_height(btree)) { |
| 1548 | case 2: |
| 1549 | bh = NULL; |
| 1550 | node = root; |
| 1551 | break; |
| 1552 | case 3: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1553 | nchildren = nilfs_btree_node_get_nchildren(root); |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1554 | WARN_ON(nchildren > 1); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1555 | ptr = nilfs_btree_node_get_ptr(btree, root, nchildren - 1); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1556 | ret = nilfs_btree_get_block(btree, ptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1557 | if (ret < 0) |
| 1558 | return ret; |
| 1559 | node = (struct nilfs_btree_node *)bh->b_data; |
| 1560 | break; |
| 1561 | default: |
| 1562 | node = NULL; |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1563 | return -EINVAL; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1564 | } |
| 1565 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1566 | nchildren = nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1567 | if (nchildren < nitems) |
| 1568 | nitems = nchildren; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1569 | dkeys = nilfs_btree_node_dkeys(node); |
| 1570 | dptrs = nilfs_btree_node_dptrs(node, btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1571 | for (i = 0; i < nitems; i++) { |
| 1572 | keys[i] = nilfs_bmap_dkey_to_key(dkeys[i]); |
| 1573 | ptrs[i] = nilfs_bmap_dptr_to_ptr(dptrs[i]); |
| 1574 | } |
| 1575 | |
| 1576 | if (bh != NULL) |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1577 | brelse(bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1578 | |
| 1579 | return nitems; |
| 1580 | } |
| 1581 | |
| 1582 | static int |
| 1583 | nilfs_btree_prepare_convert_and_insert(struct nilfs_bmap *bmap, __u64 key, |
| 1584 | union nilfs_bmap_ptr_req *dreq, |
| 1585 | union nilfs_bmap_ptr_req *nreq, |
| 1586 | struct buffer_head **bhp, |
| 1587 | struct nilfs_bmap_stats *stats) |
| 1588 | { |
| 1589 | struct buffer_head *bh; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1590 | struct nilfs_btree *btree = (struct nilfs_btree *)bmap; |
| 1591 | struct inode *dat = NULL; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1592 | int ret; |
| 1593 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1594 | stats->bs_nblocks = 0; |
| 1595 | |
| 1596 | /* for data */ |
| 1597 | /* cannot find near ptr */ |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1598 | if (NILFS_BMAP_USE_VBN(bmap)) { |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 1599 | dreq->bpr_ptr = nilfs_btree_find_target_v(btree, NULL, key); |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1600 | dat = nilfs_bmap_get_dat(bmap); |
| 1601 | } |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 1602 | |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1603 | ret = nilfs_bmap_prepare_alloc_ptr(bmap, dreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1604 | if (ret < 0) |
| 1605 | return ret; |
| 1606 | |
| 1607 | *bhp = NULL; |
| 1608 | stats->bs_nblocks++; |
| 1609 | if (nreq != NULL) { |
| 1610 | nreq->bpr_ptr = dreq->bpr_ptr + 1; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1611 | ret = nilfs_bmap_prepare_alloc_ptr(bmap, nreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1612 | if (ret < 0) |
| 1613 | goto err_out_dreq; |
| 1614 | |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1615 | ret = nilfs_btree_get_new_block(btree, nreq->bpr_ptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1616 | if (ret < 0) |
| 1617 | goto err_out_nreq; |
| 1618 | |
| 1619 | *bhp = bh; |
| 1620 | stats->bs_nblocks++; |
| 1621 | } |
| 1622 | |
| 1623 | /* success */ |
| 1624 | return 0; |
| 1625 | |
| 1626 | /* error */ |
| 1627 | err_out_nreq: |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1628 | nilfs_bmap_abort_alloc_ptr(bmap, nreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1629 | err_out_dreq: |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1630 | nilfs_bmap_abort_alloc_ptr(bmap, dreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1631 | stats->bs_nblocks = 0; |
| 1632 | return ret; |
| 1633 | |
| 1634 | } |
| 1635 | |
| 1636 | static void |
| 1637 | nilfs_btree_commit_convert_and_insert(struct nilfs_bmap *bmap, |
| 1638 | __u64 key, __u64 ptr, |
| 1639 | const __u64 *keys, const __u64 *ptrs, |
Ryusuke Konishi | 3033342 | 2009-05-24 00:09:44 +0900 | [diff] [blame] | 1640 | int n, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1641 | union nilfs_bmap_ptr_req *dreq, |
| 1642 | union nilfs_bmap_ptr_req *nreq, |
| 1643 | struct buffer_head *bh) |
| 1644 | { |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1645 | struct nilfs_btree *btree = (struct nilfs_btree *)bmap; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1646 | struct nilfs_btree_node *node; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1647 | struct inode *dat; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1648 | __u64 tmpptr; |
| 1649 | |
| 1650 | /* free resources */ |
| 1651 | if (bmap->b_ops->bop_clear != NULL) |
Pekka Enberg | 8acfbf0 | 2009-04-06 19:01:49 -0700 | [diff] [blame] | 1652 | bmap->b_ops->bop_clear(bmap); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1653 | |
| 1654 | /* ptr must be a pointer to a buffer head. */ |
| 1655 | set_buffer_nilfs_volatile((struct buffer_head *)((unsigned long)ptr)); |
| 1656 | |
| 1657 | /* convert and insert */ |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1658 | dat = NILFS_BMAP_USE_VBN(bmap) ? nilfs_bmap_get_dat(bmap) : NULL; |
Ryusuke Konishi | 3033342 | 2009-05-24 00:09:44 +0900 | [diff] [blame] | 1659 | nilfs_btree_init(bmap); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1660 | if (nreq != NULL) { |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1661 | nilfs_bmap_commit_alloc_ptr(bmap, dreq, dat); |
| 1662 | nilfs_bmap_commit_alloc_ptr(bmap, nreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1663 | |
| 1664 | /* create child node at level 1 */ |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1665 | node = (struct nilfs_btree_node *)bh->b_data; |
| 1666 | nilfs_btree_node_init(btree, node, 0, 1, n, keys, ptrs); |
| 1667 | nilfs_btree_node_insert(btree, node, |
| 1668 | key, dreq->bpr_ptr, n); |
| 1669 | if (!buffer_dirty(bh)) |
| 1670 | nilfs_btnode_mark_dirty(bh); |
| 1671 | if (!nilfs_bmap_dirty(bmap)) |
| 1672 | nilfs_bmap_set_dirty(bmap); |
| 1673 | |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1674 | brelse(bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1675 | |
| 1676 | /* create root node at level 2 */ |
| 1677 | node = nilfs_btree_get_root(btree); |
| 1678 | tmpptr = nreq->bpr_ptr; |
| 1679 | nilfs_btree_node_init(btree, node, NILFS_BTREE_NODE_ROOT, |
| 1680 | 2, 1, &keys[0], &tmpptr); |
| 1681 | } else { |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1682 | nilfs_bmap_commit_alloc_ptr(bmap, dreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1683 | |
| 1684 | /* create root node at level 1 */ |
| 1685 | node = nilfs_btree_get_root(btree); |
| 1686 | nilfs_btree_node_init(btree, node, NILFS_BTREE_NODE_ROOT, |
| 1687 | 1, n, keys, ptrs); |
| 1688 | nilfs_btree_node_insert(btree, node, |
| 1689 | key, dreq->bpr_ptr, n); |
| 1690 | if (!nilfs_bmap_dirty(bmap)) |
| 1691 | nilfs_bmap_set_dirty(bmap); |
| 1692 | } |
| 1693 | |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 1694 | if (NILFS_BMAP_USE_VBN(bmap)) |
| 1695 | nilfs_btree_set_target_v(btree, key, dreq->bpr_ptr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1696 | } |
| 1697 | |
| 1698 | /** |
| 1699 | * nilfs_btree_convert_and_insert - |
| 1700 | * @bmap: |
| 1701 | * @key: |
| 1702 | * @ptr: |
| 1703 | * @keys: |
| 1704 | * @ptrs: |
| 1705 | * @n: |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1706 | */ |
| 1707 | int nilfs_btree_convert_and_insert(struct nilfs_bmap *bmap, |
| 1708 | __u64 key, __u64 ptr, |
Ryusuke Konishi | 3033342 | 2009-05-24 00:09:44 +0900 | [diff] [blame] | 1709 | const __u64 *keys, const __u64 *ptrs, int n) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1710 | { |
| 1711 | struct buffer_head *bh; |
| 1712 | union nilfs_bmap_ptr_req dreq, nreq, *di, *ni; |
| 1713 | struct nilfs_bmap_stats stats; |
| 1714 | int ret; |
| 1715 | |
| 1716 | if (n + 1 <= NILFS_BTREE_ROOT_NCHILDREN_MAX) { |
| 1717 | di = &dreq; |
| 1718 | ni = NULL; |
| 1719 | } else if ((n + 1) <= NILFS_BTREE_NODE_NCHILDREN_MAX( |
| 1720 | 1 << bmap->b_inode->i_blkbits)) { |
| 1721 | di = &dreq; |
| 1722 | ni = &nreq; |
| 1723 | } else { |
| 1724 | di = NULL; |
| 1725 | ni = NULL; |
| 1726 | BUG(); |
| 1727 | } |
| 1728 | |
| 1729 | ret = nilfs_btree_prepare_convert_and_insert(bmap, key, di, ni, &bh, |
| 1730 | &stats); |
| 1731 | if (ret < 0) |
| 1732 | return ret; |
| 1733 | nilfs_btree_commit_convert_and_insert(bmap, key, ptr, keys, ptrs, n, |
Ryusuke Konishi | 3033342 | 2009-05-24 00:09:44 +0900 | [diff] [blame] | 1734 | di, ni, bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1735 | nilfs_bmap_add_blocks(bmap, stats.bs_nblocks); |
| 1736 | return 0; |
| 1737 | } |
| 1738 | |
| 1739 | static int nilfs_btree_propagate_p(struct nilfs_btree *btree, |
| 1740 | struct nilfs_btree_path *path, |
| 1741 | int level, |
| 1742 | struct buffer_head *bh) |
| 1743 | { |
| 1744 | while ((++level < nilfs_btree_height(btree) - 1) && |
| 1745 | !buffer_dirty(path[level].bp_bh)) |
| 1746 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 1747 | |
| 1748 | return 0; |
| 1749 | } |
| 1750 | |
| 1751 | static int nilfs_btree_prepare_update_v(struct nilfs_btree *btree, |
| 1752 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1753 | int level, struct inode *dat) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1754 | { |
| 1755 | struct nilfs_btree_node *parent; |
| 1756 | int ret; |
| 1757 | |
| 1758 | parent = nilfs_btree_get_node(btree, path, level + 1); |
| 1759 | path[level].bp_oldreq.bpr_ptr = |
| 1760 | nilfs_btree_node_get_ptr(btree, parent, |
| 1761 | path[level + 1].bp_index); |
| 1762 | 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] | 1763 | ret = nilfs_dat_prepare_update(dat, &path[level].bp_oldreq.bpr_req, |
| 1764 | &path[level].bp_newreq.bpr_req); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1765 | if (ret < 0) |
| 1766 | return ret; |
| 1767 | |
| 1768 | if (buffer_nilfs_node(path[level].bp_bh)) { |
| 1769 | path[level].bp_ctxt.oldkey = path[level].bp_oldreq.bpr_ptr; |
| 1770 | path[level].bp_ctxt.newkey = path[level].bp_newreq.bpr_ptr; |
| 1771 | path[level].bp_ctxt.bh = path[level].bp_bh; |
| 1772 | ret = nilfs_btnode_prepare_change_key( |
| 1773 | &NILFS_BMAP_I(&btree->bt_bmap)->i_btnode_cache, |
| 1774 | &path[level].bp_ctxt); |
| 1775 | if (ret < 0) { |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1776 | nilfs_dat_abort_update(dat, |
| 1777 | &path[level].bp_oldreq.bpr_req, |
| 1778 | &path[level].bp_newreq.bpr_req); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1779 | return ret; |
| 1780 | } |
| 1781 | } |
| 1782 | |
| 1783 | return 0; |
| 1784 | } |
| 1785 | |
| 1786 | static void nilfs_btree_commit_update_v(struct nilfs_btree *btree, |
| 1787 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1788 | int level, struct inode *dat) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1789 | { |
| 1790 | struct nilfs_btree_node *parent; |
| 1791 | |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1792 | nilfs_dat_commit_update(dat, &path[level].bp_oldreq.bpr_req, |
| 1793 | &path[level].bp_newreq.bpr_req, |
| 1794 | btree->bt_bmap.b_ptr_type == NILFS_BMAP_PTR_VS); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1795 | |
| 1796 | if (buffer_nilfs_node(path[level].bp_bh)) { |
| 1797 | nilfs_btnode_commit_change_key( |
| 1798 | &NILFS_BMAP_I(&btree->bt_bmap)->i_btnode_cache, |
| 1799 | &path[level].bp_ctxt); |
| 1800 | path[level].bp_bh = path[level].bp_ctxt.bh; |
| 1801 | } |
| 1802 | set_buffer_nilfs_volatile(path[level].bp_bh); |
| 1803 | |
| 1804 | parent = nilfs_btree_get_node(btree, path, level + 1); |
| 1805 | nilfs_btree_node_set_ptr(btree, parent, path[level + 1].bp_index, |
| 1806 | path[level].bp_newreq.bpr_ptr); |
| 1807 | } |
| 1808 | |
| 1809 | static void nilfs_btree_abort_update_v(struct nilfs_btree *btree, |
| 1810 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1811 | int level, struct inode *dat) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1812 | { |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1813 | nilfs_dat_abort_update(dat, &path[level].bp_oldreq.bpr_req, |
| 1814 | &path[level].bp_newreq.bpr_req); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1815 | if (buffer_nilfs_node(path[level].bp_bh)) |
| 1816 | nilfs_btnode_abort_change_key( |
| 1817 | &NILFS_BMAP_I(&btree->bt_bmap)->i_btnode_cache, |
| 1818 | &path[level].bp_ctxt); |
| 1819 | } |
| 1820 | |
| 1821 | static int nilfs_btree_prepare_propagate_v(struct nilfs_btree *btree, |
| 1822 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1823 | int minlevel, int *maxlevelp, |
| 1824 | struct inode *dat) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1825 | { |
| 1826 | int level, ret; |
| 1827 | |
| 1828 | level = minlevel; |
| 1829 | if (!buffer_nilfs_volatile(path[level].bp_bh)) { |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1830 | ret = nilfs_btree_prepare_update_v(btree, path, level, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1831 | if (ret < 0) |
| 1832 | return ret; |
| 1833 | } |
| 1834 | while ((++level < nilfs_btree_height(btree) - 1) && |
| 1835 | !buffer_dirty(path[level].bp_bh)) { |
| 1836 | |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1837 | WARN_ON(buffer_nilfs_volatile(path[level].bp_bh)); |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1838 | ret = nilfs_btree_prepare_update_v(btree, path, level, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1839 | if (ret < 0) |
| 1840 | goto out; |
| 1841 | } |
| 1842 | |
| 1843 | /* success */ |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1844 | *maxlevelp = level - 1; |
| 1845 | return 0; |
| 1846 | |
| 1847 | /* error */ |
| 1848 | out: |
| 1849 | while (--level > minlevel) |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1850 | nilfs_btree_abort_update_v(btree, path, level, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1851 | if (!buffer_nilfs_volatile(path[level].bp_bh)) |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1852 | nilfs_btree_abort_update_v(btree, path, level, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1853 | return ret; |
| 1854 | } |
| 1855 | |
| 1856 | static void nilfs_btree_commit_propagate_v(struct nilfs_btree *btree, |
| 1857 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1858 | int minlevel, int maxlevel, |
| 1859 | struct buffer_head *bh, |
| 1860 | struct inode *dat) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1861 | { |
| 1862 | int level; |
| 1863 | |
| 1864 | if (!buffer_nilfs_volatile(path[minlevel].bp_bh)) |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1865 | nilfs_btree_commit_update_v(btree, path, minlevel, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1866 | |
| 1867 | for (level = minlevel + 1; level <= maxlevel; level++) |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1868 | nilfs_btree_commit_update_v(btree, path, level, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1869 | } |
| 1870 | |
| 1871 | static int nilfs_btree_propagate_v(struct nilfs_btree *btree, |
| 1872 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1873 | int level, struct buffer_head *bh) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1874 | { |
Li Hong | 308f441 | 2010-04-02 18:40:39 +0800 | [diff] [blame] | 1875 | int maxlevel = 0, ret; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1876 | struct nilfs_btree_node *parent; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1877 | struct inode *dat = nilfs_bmap_get_dat(&btree->bt_bmap); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1878 | __u64 ptr; |
| 1879 | |
| 1880 | get_bh(bh); |
| 1881 | path[level].bp_bh = bh; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1882 | ret = nilfs_btree_prepare_propagate_v(btree, path, level, &maxlevel, |
| 1883 | dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1884 | if (ret < 0) |
| 1885 | goto out; |
| 1886 | |
| 1887 | if (buffer_nilfs_volatile(path[level].bp_bh)) { |
| 1888 | parent = nilfs_btree_get_node(btree, path, level + 1); |
| 1889 | ptr = nilfs_btree_node_get_ptr(btree, parent, |
| 1890 | path[level + 1].bp_index); |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1891 | ret = nilfs_dat_mark_dirty(dat, ptr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1892 | if (ret < 0) |
| 1893 | goto out; |
| 1894 | } |
| 1895 | |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1896 | nilfs_btree_commit_propagate_v(btree, path, level, maxlevel, bh, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1897 | |
| 1898 | out: |
| 1899 | brelse(path[level].bp_bh); |
| 1900 | path[level].bp_bh = NULL; |
| 1901 | return ret; |
| 1902 | } |
| 1903 | |
| 1904 | static int nilfs_btree_propagate(const struct nilfs_bmap *bmap, |
| 1905 | struct buffer_head *bh) |
| 1906 | { |
| 1907 | struct nilfs_btree *btree; |
| 1908 | struct nilfs_btree_path *path; |
| 1909 | struct nilfs_btree_node *node; |
| 1910 | __u64 key; |
| 1911 | int level, ret; |
| 1912 | |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1913 | WARN_ON(!buffer_dirty(bh)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1914 | |
| 1915 | btree = (struct nilfs_btree *)bmap; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1916 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1917 | if (path == NULL) |
| 1918 | return -ENOMEM; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1919 | |
| 1920 | if (buffer_nilfs_node(bh)) { |
| 1921 | node = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1922 | key = nilfs_btree_node_get_key(node, 0); |
| 1923 | level = nilfs_btree_node_get_level(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1924 | } else { |
| 1925 | key = nilfs_bmap_data_get_key(bmap, bh); |
| 1926 | level = NILFS_BTREE_LEVEL_DATA; |
| 1927 | } |
| 1928 | |
| 1929 | ret = nilfs_btree_do_lookup(btree, path, key, NULL, level + 1); |
| 1930 | if (ret < 0) { |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1931 | if (unlikely(ret == -ENOENT)) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1932 | printk(KERN_CRIT "%s: key = %llu, level == %d\n", |
| 1933 | __func__, (unsigned long long)key, level); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1934 | goto out; |
| 1935 | } |
| 1936 | |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 1937 | ret = NILFS_BMAP_USE_VBN(bmap) ? |
| 1938 | nilfs_btree_propagate_v(btree, path, level, bh) : |
| 1939 | nilfs_btree_propagate_p(btree, path, level, bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1940 | |
| 1941 | out: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1942 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1943 | |
| 1944 | return ret; |
| 1945 | } |
| 1946 | |
| 1947 | static int nilfs_btree_propagate_gc(const struct nilfs_bmap *bmap, |
| 1948 | struct buffer_head *bh) |
| 1949 | { |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1950 | return nilfs_dat_mark_dirty(nilfs_bmap_get_dat(bmap), bh->b_blocknr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1951 | } |
| 1952 | |
| 1953 | static void nilfs_btree_add_dirty_buffer(struct nilfs_btree *btree, |
| 1954 | struct list_head *lists, |
| 1955 | struct buffer_head *bh) |
| 1956 | { |
| 1957 | struct list_head *head; |
| 1958 | struct buffer_head *cbh; |
| 1959 | struct nilfs_btree_node *node, *cnode; |
| 1960 | __u64 key, ckey; |
| 1961 | int level; |
| 1962 | |
| 1963 | get_bh(bh); |
| 1964 | node = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1965 | key = nilfs_btree_node_get_key(node, 0); |
| 1966 | level = nilfs_btree_node_get_level(node); |
Ryusuke Konishi | cfa913a | 2010-07-07 17:19:54 +0900 | [diff] [blame] | 1967 | if (level < NILFS_BTREE_LEVEL_NODE_MIN || |
| 1968 | level >= NILFS_BTREE_LEVEL_MAX) { |
| 1969 | dump_stack(); |
| 1970 | printk(KERN_WARNING |
| 1971 | "%s: invalid btree level: %d (key=%llu, ino=%lu, " |
| 1972 | "blocknr=%llu)\n", |
| 1973 | __func__, level, (unsigned long long)key, |
| 1974 | NILFS_BMAP_I(&btree->bt_bmap)->vfs_inode.i_ino, |
| 1975 | (unsigned long long)bh->b_blocknr); |
| 1976 | return; |
| 1977 | } |
| 1978 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1979 | list_for_each(head, &lists[level]) { |
| 1980 | cbh = list_entry(head, struct buffer_head, b_assoc_buffers); |
| 1981 | cnode = (struct nilfs_btree_node *)cbh->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1982 | ckey = nilfs_btree_node_get_key(cnode, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1983 | if (key < ckey) |
| 1984 | break; |
| 1985 | } |
| 1986 | list_add_tail(&bh->b_assoc_buffers, head); |
| 1987 | } |
| 1988 | |
| 1989 | static void nilfs_btree_lookup_dirty_buffers(struct nilfs_bmap *bmap, |
| 1990 | struct list_head *listp) |
| 1991 | { |
| 1992 | struct nilfs_btree *btree = (struct nilfs_btree *)bmap; |
| 1993 | struct address_space *btcache = &NILFS_BMAP_I(bmap)->i_btnode_cache; |
| 1994 | struct list_head lists[NILFS_BTREE_LEVEL_MAX]; |
| 1995 | struct pagevec pvec; |
| 1996 | struct buffer_head *bh, *head; |
| 1997 | pgoff_t index = 0; |
| 1998 | int level, i; |
| 1999 | |
| 2000 | for (level = NILFS_BTREE_LEVEL_NODE_MIN; |
| 2001 | level < NILFS_BTREE_LEVEL_MAX; |
| 2002 | level++) |
| 2003 | INIT_LIST_HEAD(&lists[level]); |
| 2004 | |
| 2005 | pagevec_init(&pvec, 0); |
| 2006 | |
| 2007 | while (pagevec_lookup_tag(&pvec, btcache, &index, PAGECACHE_TAG_DIRTY, |
| 2008 | PAGEVEC_SIZE)) { |
| 2009 | for (i = 0; i < pagevec_count(&pvec); i++) { |
| 2010 | bh = head = page_buffers(pvec.pages[i]); |
| 2011 | do { |
| 2012 | if (buffer_dirty(bh)) |
| 2013 | nilfs_btree_add_dirty_buffer(btree, |
| 2014 | lists, bh); |
| 2015 | } while ((bh = bh->b_this_page) != head); |
| 2016 | } |
| 2017 | pagevec_release(&pvec); |
| 2018 | cond_resched(); |
| 2019 | } |
| 2020 | |
| 2021 | for (level = NILFS_BTREE_LEVEL_NODE_MIN; |
| 2022 | level < NILFS_BTREE_LEVEL_MAX; |
| 2023 | level++) |
Ryusuke Konishi | 0935db7 | 2009-11-29 02:39:11 +0900 | [diff] [blame] | 2024 | list_splice_tail(&lists[level], listp); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2025 | } |
| 2026 | |
| 2027 | static int nilfs_btree_assign_p(struct nilfs_btree *btree, |
| 2028 | struct nilfs_btree_path *path, |
| 2029 | int level, |
| 2030 | struct buffer_head **bh, |
| 2031 | sector_t blocknr, |
| 2032 | union nilfs_binfo *binfo) |
| 2033 | { |
| 2034 | struct nilfs_btree_node *parent; |
| 2035 | __u64 key; |
| 2036 | __u64 ptr; |
| 2037 | int ret; |
| 2038 | |
| 2039 | parent = nilfs_btree_get_node(btree, path, level + 1); |
| 2040 | ptr = nilfs_btree_node_get_ptr(btree, parent, |
| 2041 | path[level + 1].bp_index); |
| 2042 | if (buffer_nilfs_node(*bh)) { |
| 2043 | path[level].bp_ctxt.oldkey = ptr; |
| 2044 | path[level].bp_ctxt.newkey = blocknr; |
| 2045 | path[level].bp_ctxt.bh = *bh; |
| 2046 | ret = nilfs_btnode_prepare_change_key( |
| 2047 | &NILFS_BMAP_I(&btree->bt_bmap)->i_btnode_cache, |
| 2048 | &path[level].bp_ctxt); |
| 2049 | if (ret < 0) |
| 2050 | return ret; |
| 2051 | nilfs_btnode_commit_change_key( |
| 2052 | &NILFS_BMAP_I(&btree->bt_bmap)->i_btnode_cache, |
| 2053 | &path[level].bp_ctxt); |
| 2054 | *bh = path[level].bp_ctxt.bh; |
| 2055 | } |
| 2056 | |
| 2057 | nilfs_btree_node_set_ptr(btree, parent, |
| 2058 | path[level + 1].bp_index, blocknr); |
| 2059 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2060 | key = nilfs_btree_node_get_key(parent, path[level + 1].bp_index); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2061 | /* on-disk format */ |
| 2062 | binfo->bi_dat.bi_blkoff = nilfs_bmap_key_to_dkey(key); |
| 2063 | binfo->bi_dat.bi_level = level; |
| 2064 | |
| 2065 | return 0; |
| 2066 | } |
| 2067 | |
| 2068 | static int nilfs_btree_assign_v(struct nilfs_btree *btree, |
| 2069 | struct nilfs_btree_path *path, |
| 2070 | int level, |
| 2071 | struct buffer_head **bh, |
| 2072 | sector_t blocknr, |
| 2073 | union nilfs_binfo *binfo) |
| 2074 | { |
| 2075 | struct nilfs_btree_node *parent; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 2076 | struct inode *dat = nilfs_bmap_get_dat(&btree->bt_bmap); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2077 | __u64 key; |
| 2078 | __u64 ptr; |
| 2079 | union nilfs_bmap_ptr_req req; |
| 2080 | int ret; |
| 2081 | |
| 2082 | parent = nilfs_btree_get_node(btree, path, level + 1); |
| 2083 | ptr = nilfs_btree_node_get_ptr(btree, parent, |
| 2084 | path[level + 1].bp_index); |
| 2085 | req.bpr_ptr = ptr; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 2086 | ret = nilfs_dat_prepare_start(dat, &req.bpr_req); |
| 2087 | if (ret < 0) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2088 | return ret; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 2089 | nilfs_dat_commit_start(dat, &req.bpr_req, blocknr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2090 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2091 | key = nilfs_btree_node_get_key(parent, path[level + 1].bp_index); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2092 | /* on-disk format */ |
| 2093 | binfo->bi_v.bi_vblocknr = nilfs_bmap_ptr_to_dptr(ptr); |
| 2094 | binfo->bi_v.bi_blkoff = nilfs_bmap_key_to_dkey(key); |
| 2095 | |
| 2096 | return 0; |
| 2097 | } |
| 2098 | |
| 2099 | static int nilfs_btree_assign(struct nilfs_bmap *bmap, |
| 2100 | struct buffer_head **bh, |
| 2101 | sector_t blocknr, |
| 2102 | union nilfs_binfo *binfo) |
| 2103 | { |
| 2104 | struct nilfs_btree *btree; |
| 2105 | struct nilfs_btree_path *path; |
| 2106 | struct nilfs_btree_node *node; |
| 2107 | __u64 key; |
| 2108 | int level, ret; |
| 2109 | |
| 2110 | btree = (struct nilfs_btree *)bmap; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2111 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2112 | if (path == NULL) |
| 2113 | return -ENOMEM; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2114 | |
| 2115 | if (buffer_nilfs_node(*bh)) { |
| 2116 | node = (struct nilfs_btree_node *)(*bh)->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2117 | key = nilfs_btree_node_get_key(node, 0); |
| 2118 | level = nilfs_btree_node_get_level(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2119 | } else { |
| 2120 | key = nilfs_bmap_data_get_key(bmap, *bh); |
| 2121 | level = NILFS_BTREE_LEVEL_DATA; |
| 2122 | } |
| 2123 | |
| 2124 | ret = nilfs_btree_do_lookup(btree, path, key, NULL, level + 1); |
| 2125 | if (ret < 0) { |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 2126 | WARN_ON(ret == -ENOENT); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2127 | goto out; |
| 2128 | } |
| 2129 | |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 2130 | ret = NILFS_BMAP_USE_VBN(bmap) ? |
| 2131 | nilfs_btree_assign_v(btree, path, level, bh, blocknr, binfo) : |
| 2132 | nilfs_btree_assign_p(btree, path, level, bh, blocknr, binfo); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2133 | |
| 2134 | out: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2135 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2136 | |
| 2137 | return ret; |
| 2138 | } |
| 2139 | |
| 2140 | static int nilfs_btree_assign_gc(struct nilfs_bmap *bmap, |
| 2141 | struct buffer_head **bh, |
| 2142 | sector_t blocknr, |
| 2143 | union nilfs_binfo *binfo) |
| 2144 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2145 | struct nilfs_btree_node *node; |
| 2146 | __u64 key; |
| 2147 | int ret; |
| 2148 | |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 2149 | ret = nilfs_dat_move(nilfs_bmap_get_dat(bmap), (*bh)->b_blocknr, |
| 2150 | blocknr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2151 | if (ret < 0) |
| 2152 | return ret; |
| 2153 | |
| 2154 | if (buffer_nilfs_node(*bh)) { |
| 2155 | node = (struct nilfs_btree_node *)(*bh)->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2156 | key = nilfs_btree_node_get_key(node, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2157 | } else |
| 2158 | key = nilfs_bmap_data_get_key(bmap, *bh); |
| 2159 | |
| 2160 | /* on-disk format */ |
| 2161 | binfo->bi_v.bi_vblocknr = cpu_to_le64((*bh)->b_blocknr); |
| 2162 | binfo->bi_v.bi_blkoff = nilfs_bmap_key_to_dkey(key); |
| 2163 | |
| 2164 | return 0; |
| 2165 | } |
| 2166 | |
| 2167 | static int nilfs_btree_mark(struct nilfs_bmap *bmap, __u64 key, int level) |
| 2168 | { |
| 2169 | struct buffer_head *bh; |
| 2170 | struct nilfs_btree *btree; |
| 2171 | struct nilfs_btree_path *path; |
| 2172 | __u64 ptr; |
| 2173 | int ret; |
| 2174 | |
| 2175 | btree = (struct nilfs_btree *)bmap; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2176 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2177 | if (path == NULL) |
| 2178 | return -ENOMEM; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2179 | |
| 2180 | ret = nilfs_btree_do_lookup(btree, path, key, &ptr, level + 1); |
| 2181 | if (ret < 0) { |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 2182 | WARN_ON(ret == -ENOENT); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2183 | goto out; |
| 2184 | } |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 2185 | ret = nilfs_btree_get_block(btree, ptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2186 | if (ret < 0) { |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 2187 | WARN_ON(ret == -ENOENT); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2188 | goto out; |
| 2189 | } |
| 2190 | |
| 2191 | if (!buffer_dirty(bh)) |
| 2192 | nilfs_btnode_mark_dirty(bh); |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 2193 | brelse(bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2194 | if (!nilfs_bmap_dirty(&btree->bt_bmap)) |
| 2195 | nilfs_bmap_set_dirty(&btree->bt_bmap); |
| 2196 | |
| 2197 | out: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2198 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2199 | return ret; |
| 2200 | } |
| 2201 | |
| 2202 | static const struct nilfs_bmap_operations nilfs_btree_ops = { |
| 2203 | .bop_lookup = nilfs_btree_lookup, |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 2204 | .bop_lookup_contig = nilfs_btree_lookup_contig, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2205 | .bop_insert = nilfs_btree_insert, |
| 2206 | .bop_delete = nilfs_btree_delete, |
| 2207 | .bop_clear = NULL, |
| 2208 | |
| 2209 | .bop_propagate = nilfs_btree_propagate, |
| 2210 | |
| 2211 | .bop_lookup_dirty_buffers = nilfs_btree_lookup_dirty_buffers, |
| 2212 | |
| 2213 | .bop_assign = nilfs_btree_assign, |
| 2214 | .bop_mark = nilfs_btree_mark, |
| 2215 | |
| 2216 | .bop_last_key = nilfs_btree_last_key, |
| 2217 | .bop_check_insert = NULL, |
| 2218 | .bop_check_delete = nilfs_btree_check_delete, |
| 2219 | .bop_gather_data = nilfs_btree_gather_data, |
| 2220 | }; |
| 2221 | |
| 2222 | static const struct nilfs_bmap_operations nilfs_btree_ops_gc = { |
| 2223 | .bop_lookup = NULL, |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 2224 | .bop_lookup_contig = NULL, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2225 | .bop_insert = NULL, |
| 2226 | .bop_delete = NULL, |
| 2227 | .bop_clear = NULL, |
| 2228 | |
| 2229 | .bop_propagate = nilfs_btree_propagate_gc, |
| 2230 | |
| 2231 | .bop_lookup_dirty_buffers = nilfs_btree_lookup_dirty_buffers, |
| 2232 | |
| 2233 | .bop_assign = nilfs_btree_assign_gc, |
| 2234 | .bop_mark = NULL, |
| 2235 | |
| 2236 | .bop_last_key = NULL, |
| 2237 | .bop_check_insert = NULL, |
| 2238 | .bop_check_delete = NULL, |
| 2239 | .bop_gather_data = NULL, |
| 2240 | }; |
| 2241 | |
Ryusuke Konishi | 3033342 | 2009-05-24 00:09:44 +0900 | [diff] [blame] | 2242 | int nilfs_btree_init(struct nilfs_bmap *bmap) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2243 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2244 | bmap->b_ops = &nilfs_btree_ops; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2245 | return 0; |
| 2246 | } |
| 2247 | |
| 2248 | void nilfs_btree_init_gc(struct nilfs_bmap *bmap) |
| 2249 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2250 | bmap->b_ops = &nilfs_btree_ops_gc; |
| 2251 | } |