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 | |
| 34 | /** |
| 35 | * struct nilfs_btree_path - A path on which B-tree operations are executed |
| 36 | * @bp_bh: buffer head of node block |
| 37 | * @bp_sib_bh: buffer head of sibling node block |
| 38 | * @bp_index: index of child node |
| 39 | * @bp_oldreq: ptr end request for old ptr |
| 40 | * @bp_newreq: ptr alloc request for new ptr |
| 41 | * @bp_op: rebalance operation |
| 42 | */ |
| 43 | struct nilfs_btree_path { |
| 44 | struct buffer_head *bp_bh; |
| 45 | struct buffer_head *bp_sib_bh; |
| 46 | int bp_index; |
| 47 | union nilfs_bmap_ptr_req bp_oldreq; |
| 48 | union nilfs_bmap_ptr_req bp_newreq; |
| 49 | struct nilfs_btnode_chkey_ctxt bp_ctxt; |
| 50 | void (*bp_op)(struct nilfs_btree *, struct nilfs_btree_path *, |
| 51 | int, __u64 *, __u64 *); |
| 52 | }; |
| 53 | |
| 54 | /* |
| 55 | * B-tree path operations |
| 56 | */ |
| 57 | |
| 58 | static struct kmem_cache *nilfs_btree_path_cache; |
| 59 | |
| 60 | int __init nilfs_btree_path_cache_init(void) |
| 61 | { |
| 62 | nilfs_btree_path_cache = |
| 63 | kmem_cache_create("nilfs2_btree_path_cache", |
| 64 | sizeof(struct nilfs_btree_path) * |
| 65 | NILFS_BTREE_LEVEL_MAX, 0, 0, NULL); |
| 66 | return (nilfs_btree_path_cache != NULL) ? 0 : -ENOMEM; |
| 67 | } |
| 68 | |
| 69 | void nilfs_btree_path_cache_destroy(void) |
| 70 | { |
| 71 | kmem_cache_destroy(nilfs_btree_path_cache); |
| 72 | } |
| 73 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 74 | static inline struct nilfs_btree_path *nilfs_btree_alloc_path(void) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 75 | { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 76 | return kmem_cache_alloc(nilfs_btree_path_cache, GFP_NOFS); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 77 | } |
| 78 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 79 | static inline void nilfs_btree_free_path(struct nilfs_btree_path *path) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 80 | { |
| 81 | kmem_cache_free(nilfs_btree_path_cache, path); |
| 82 | } |
| 83 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 84 | static void nilfs_btree_init_path(struct nilfs_btree_path *path) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 85 | { |
| 86 | int level; |
| 87 | |
| 88 | for (level = NILFS_BTREE_LEVEL_DATA; |
| 89 | level < NILFS_BTREE_LEVEL_MAX; |
| 90 | level++) { |
| 91 | path[level].bp_bh = NULL; |
| 92 | path[level].bp_sib_bh = NULL; |
| 93 | path[level].bp_index = 0; |
| 94 | path[level].bp_oldreq.bpr_ptr = NILFS_BMAP_INVALID_PTR; |
| 95 | path[level].bp_newreq.bpr_ptr = NILFS_BMAP_INVALID_PTR; |
| 96 | path[level].bp_op = NULL; |
| 97 | } |
| 98 | } |
| 99 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 100 | static void nilfs_btree_clear_path(struct nilfs_btree_path *path) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 101 | { |
| 102 | int level; |
| 103 | |
| 104 | for (level = NILFS_BTREE_LEVEL_DATA; |
| 105 | level < NILFS_BTREE_LEVEL_MAX; |
| 106 | level++) { |
| 107 | if (path[level].bp_bh != NULL) { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 108 | brelse(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 109 | path[level].bp_bh = NULL; |
| 110 | } |
| 111 | /* sib_bh is released or deleted by prepare or commit |
| 112 | * operations. */ |
| 113 | path[level].bp_sib_bh = NULL; |
| 114 | path[level].bp_index = 0; |
| 115 | path[level].bp_oldreq.bpr_ptr = NILFS_BMAP_INVALID_PTR; |
| 116 | path[level].bp_newreq.bpr_ptr = NILFS_BMAP_INVALID_PTR; |
| 117 | path[level].bp_op = NULL; |
| 118 | } |
| 119 | } |
| 120 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 121 | /* |
| 122 | * B-tree node operations |
| 123 | */ |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 124 | static int nilfs_btree_get_block(const struct nilfs_btree *btree, __u64 ptr, |
| 125 | struct buffer_head **bhp) |
| 126 | { |
| 127 | struct address_space *btnc = |
| 128 | &NILFS_BMAP_I((struct nilfs_bmap *)btree)->i_btnode_cache; |
| 129 | return nilfs_btnode_get(btnc, ptr, 0, bhp, 0); |
| 130 | } |
| 131 | |
| 132 | static int nilfs_btree_get_new_block(const struct nilfs_btree *btree, |
| 133 | __u64 ptr, struct buffer_head **bhp) |
| 134 | { |
| 135 | struct address_space *btnc = |
| 136 | &NILFS_BMAP_I((struct nilfs_bmap *)btree)->i_btnode_cache; |
| 137 | int ret; |
| 138 | |
| 139 | ret = nilfs_btnode_get(btnc, ptr, 0, bhp, 1); |
| 140 | if (!ret) |
| 141 | set_buffer_nilfs_volatile(*bhp); |
| 142 | return ret; |
| 143 | } |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 144 | |
| 145 | static inline int |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 146 | nilfs_btree_node_get_flags(const struct nilfs_btree_node *node) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 147 | { |
| 148 | return node->bn_flags; |
| 149 | } |
| 150 | |
| 151 | static inline void |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 152 | nilfs_btree_node_set_flags(struct nilfs_btree_node *node, int flags) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 153 | { |
| 154 | node->bn_flags = flags; |
| 155 | } |
| 156 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 157 | 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] | 158 | { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 159 | return nilfs_btree_node_get_flags(node) & NILFS_BTREE_NODE_ROOT; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 160 | } |
| 161 | |
| 162 | static inline int |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 163 | nilfs_btree_node_get_level(const struct nilfs_btree_node *node) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 164 | { |
| 165 | return node->bn_level; |
| 166 | } |
| 167 | |
| 168 | static inline void |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 169 | nilfs_btree_node_set_level(struct nilfs_btree_node *node, int level) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 170 | { |
| 171 | node->bn_level = level; |
| 172 | } |
| 173 | |
| 174 | static inline int |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 175 | nilfs_btree_node_get_nchildren(const struct nilfs_btree_node *node) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 176 | { |
| 177 | return le16_to_cpu(node->bn_nchildren); |
| 178 | } |
| 179 | |
| 180 | static inline void |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 181 | nilfs_btree_node_set_nchildren(struct nilfs_btree_node *node, int nchildren) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 182 | { |
| 183 | node->bn_nchildren = cpu_to_le16(nchildren); |
| 184 | } |
| 185 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 186 | static inline int nilfs_btree_node_size(const struct nilfs_btree *btree) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 187 | { |
| 188 | return 1 << btree->bt_bmap.b_inode->i_blkbits; |
| 189 | } |
| 190 | |
| 191 | static inline int |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 192 | nilfs_btree_node_nchildren_min(const struct nilfs_btree_node *node, |
| 193 | const struct nilfs_btree *btree) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 194 | { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 195 | return nilfs_btree_node_root(node) ? |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 196 | NILFS_BTREE_ROOT_NCHILDREN_MIN : |
| 197 | NILFS_BTREE_NODE_NCHILDREN_MIN(nilfs_btree_node_size(btree)); |
| 198 | } |
| 199 | |
| 200 | static inline int |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 201 | nilfs_btree_node_nchildren_max(const struct nilfs_btree_node *node, |
| 202 | const struct nilfs_btree *btree) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 203 | { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 204 | return nilfs_btree_node_root(node) ? |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 205 | NILFS_BTREE_ROOT_NCHILDREN_MAX : |
| 206 | NILFS_BTREE_NODE_NCHILDREN_MAX(nilfs_btree_node_size(btree)); |
| 207 | } |
| 208 | |
| 209 | static inline __le64 * |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 210 | nilfs_btree_node_dkeys(const struct nilfs_btree_node *node) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 211 | { |
| 212 | return (__le64 *)((char *)(node + 1) + |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 213 | (nilfs_btree_node_root(node) ? |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 214 | 0 : NILFS_BTREE_NODE_EXTRA_PAD_SIZE)); |
| 215 | } |
| 216 | |
| 217 | static inline __le64 * |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 218 | nilfs_btree_node_dptrs(const struct nilfs_btree_node *node, |
| 219 | const struct nilfs_btree *btree) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 220 | { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 221 | return (__le64 *)(nilfs_btree_node_dkeys(node) + |
| 222 | nilfs_btree_node_nchildren_max(node, btree)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 223 | } |
| 224 | |
| 225 | static inline __u64 |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 226 | 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] | 227 | { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 228 | return nilfs_bmap_dkey_to_key(*(nilfs_btree_node_dkeys(node) + index)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 229 | } |
| 230 | |
| 231 | static inline void |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 232 | 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] | 233 | { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 234 | *(nilfs_btree_node_dkeys(node) + index) = nilfs_bmap_key_to_dkey(key); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 235 | } |
| 236 | |
| 237 | static inline __u64 |
| 238 | nilfs_btree_node_get_ptr(const struct nilfs_btree *btree, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 239 | const struct nilfs_btree_node *node, int index) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 240 | { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 241 | return nilfs_bmap_dptr_to_ptr(*(nilfs_btree_node_dptrs(node, btree) + |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 242 | index)); |
| 243 | } |
| 244 | |
| 245 | static inline void |
| 246 | nilfs_btree_node_set_ptr(struct nilfs_btree *btree, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 247 | struct nilfs_btree_node *node, int index, __u64 ptr) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 248 | { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 249 | *(nilfs_btree_node_dptrs(node, btree) + index) = |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 250 | nilfs_bmap_ptr_to_dptr(ptr); |
| 251 | } |
| 252 | |
| 253 | static void nilfs_btree_node_init(struct nilfs_btree *btree, |
| 254 | struct nilfs_btree_node *node, |
| 255 | int flags, int level, int nchildren, |
| 256 | const __u64 *keys, const __u64 *ptrs) |
| 257 | { |
| 258 | __le64 *dkeys; |
| 259 | __le64 *dptrs; |
| 260 | int i; |
| 261 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 262 | nilfs_btree_node_set_flags(node, flags); |
| 263 | nilfs_btree_node_set_level(node, level); |
| 264 | nilfs_btree_node_set_nchildren(node, nchildren); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 265 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 266 | dkeys = nilfs_btree_node_dkeys(node); |
| 267 | dptrs = nilfs_btree_node_dptrs(node, btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 268 | for (i = 0; i < nchildren; i++) { |
| 269 | dkeys[i] = nilfs_bmap_key_to_dkey(keys[i]); |
| 270 | dptrs[i] = nilfs_bmap_ptr_to_dptr(ptrs[i]); |
| 271 | } |
| 272 | } |
| 273 | |
| 274 | /* Assume the buffer heads corresponding to left and right are locked. */ |
| 275 | static void nilfs_btree_node_move_left(struct nilfs_btree *btree, |
| 276 | struct nilfs_btree_node *left, |
| 277 | struct nilfs_btree_node *right, |
| 278 | int n) |
| 279 | { |
| 280 | __le64 *ldkeys, *rdkeys; |
| 281 | __le64 *ldptrs, *rdptrs; |
| 282 | int lnchildren, rnchildren; |
| 283 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 284 | ldkeys = nilfs_btree_node_dkeys(left); |
| 285 | ldptrs = nilfs_btree_node_dptrs(left, btree); |
| 286 | lnchildren = nilfs_btree_node_get_nchildren(left); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 287 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 288 | rdkeys = nilfs_btree_node_dkeys(right); |
| 289 | rdptrs = nilfs_btree_node_dptrs(right, btree); |
| 290 | rnchildren = nilfs_btree_node_get_nchildren(right); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 291 | |
| 292 | memcpy(ldkeys + lnchildren, rdkeys, n * sizeof(*rdkeys)); |
| 293 | memcpy(ldptrs + lnchildren, rdptrs, n * sizeof(*rdptrs)); |
| 294 | memmove(rdkeys, rdkeys + n, (rnchildren - n) * sizeof(*rdkeys)); |
| 295 | memmove(rdptrs, rdptrs + n, (rnchildren - n) * sizeof(*rdptrs)); |
| 296 | |
| 297 | lnchildren += n; |
| 298 | rnchildren -= n; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 299 | nilfs_btree_node_set_nchildren(left, lnchildren); |
| 300 | nilfs_btree_node_set_nchildren(right, rnchildren); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 301 | } |
| 302 | |
| 303 | /* Assume that the buffer heads corresponding to left and right are locked. */ |
| 304 | static void nilfs_btree_node_move_right(struct nilfs_btree *btree, |
| 305 | struct nilfs_btree_node *left, |
| 306 | struct nilfs_btree_node *right, |
| 307 | int n) |
| 308 | { |
| 309 | __le64 *ldkeys, *rdkeys; |
| 310 | __le64 *ldptrs, *rdptrs; |
| 311 | int lnchildren, rnchildren; |
| 312 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 313 | ldkeys = nilfs_btree_node_dkeys(left); |
| 314 | ldptrs = nilfs_btree_node_dptrs(left, btree); |
| 315 | lnchildren = nilfs_btree_node_get_nchildren(left); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 316 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 317 | rdkeys = nilfs_btree_node_dkeys(right); |
| 318 | rdptrs = nilfs_btree_node_dptrs(right, btree); |
| 319 | rnchildren = nilfs_btree_node_get_nchildren(right); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 320 | |
| 321 | memmove(rdkeys + n, rdkeys, rnchildren * sizeof(*rdkeys)); |
| 322 | memmove(rdptrs + n, rdptrs, rnchildren * sizeof(*rdptrs)); |
| 323 | memcpy(rdkeys, ldkeys + lnchildren - n, n * sizeof(*rdkeys)); |
| 324 | memcpy(rdptrs, ldptrs + lnchildren - n, n * sizeof(*rdptrs)); |
| 325 | |
| 326 | lnchildren -= n; |
| 327 | rnchildren += n; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 328 | nilfs_btree_node_set_nchildren(left, lnchildren); |
| 329 | nilfs_btree_node_set_nchildren(right, rnchildren); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 330 | } |
| 331 | |
| 332 | /* Assume that the buffer head corresponding to node is locked. */ |
| 333 | static void nilfs_btree_node_insert(struct nilfs_btree *btree, |
| 334 | struct nilfs_btree_node *node, |
| 335 | __u64 key, __u64 ptr, int index) |
| 336 | { |
| 337 | __le64 *dkeys; |
| 338 | __le64 *dptrs; |
| 339 | int nchildren; |
| 340 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 341 | dkeys = nilfs_btree_node_dkeys(node); |
| 342 | dptrs = nilfs_btree_node_dptrs(node, btree); |
| 343 | nchildren = nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 344 | if (index < nchildren) { |
| 345 | memmove(dkeys + index + 1, dkeys + index, |
| 346 | (nchildren - index) * sizeof(*dkeys)); |
| 347 | memmove(dptrs + index + 1, dptrs + index, |
| 348 | (nchildren - index) * sizeof(*dptrs)); |
| 349 | } |
| 350 | dkeys[index] = nilfs_bmap_key_to_dkey(key); |
| 351 | dptrs[index] = nilfs_bmap_ptr_to_dptr(ptr); |
| 352 | nchildren++; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 353 | nilfs_btree_node_set_nchildren(node, nchildren); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 354 | } |
| 355 | |
| 356 | /* Assume that the buffer head corresponding to node is locked. */ |
| 357 | static void nilfs_btree_node_delete(struct nilfs_btree *btree, |
| 358 | struct nilfs_btree_node *node, |
| 359 | __u64 *keyp, __u64 *ptrp, int index) |
| 360 | { |
| 361 | __u64 key; |
| 362 | __u64 ptr; |
| 363 | __le64 *dkeys; |
| 364 | __le64 *dptrs; |
| 365 | int nchildren; |
| 366 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 367 | dkeys = nilfs_btree_node_dkeys(node); |
| 368 | dptrs = nilfs_btree_node_dptrs(node, btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 369 | key = nilfs_bmap_dkey_to_key(dkeys[index]); |
| 370 | ptr = nilfs_bmap_dptr_to_ptr(dptrs[index]); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 371 | nchildren = nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 372 | if (keyp != NULL) |
| 373 | *keyp = key; |
| 374 | if (ptrp != NULL) |
| 375 | *ptrp = ptr; |
| 376 | |
| 377 | if (index < nchildren - 1) { |
| 378 | memmove(dkeys + index, dkeys + index + 1, |
| 379 | (nchildren - index - 1) * sizeof(*dkeys)); |
| 380 | memmove(dptrs + index, dptrs + index + 1, |
| 381 | (nchildren - index - 1) * sizeof(*dptrs)); |
| 382 | } |
| 383 | nchildren--; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 384 | nilfs_btree_node_set_nchildren(node, nchildren); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 385 | } |
| 386 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 387 | static int nilfs_btree_node_lookup(const struct nilfs_btree_node *node, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 388 | __u64 key, int *indexp) |
| 389 | { |
| 390 | __u64 nkey; |
| 391 | int index, low, high, s; |
| 392 | |
| 393 | /* binary search */ |
| 394 | low = 0; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 395 | high = nilfs_btree_node_get_nchildren(node) - 1; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 396 | index = 0; |
| 397 | s = 0; |
| 398 | while (low <= high) { |
| 399 | index = (low + high) / 2; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 400 | nkey = nilfs_btree_node_get_key(node, index); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 401 | if (nkey == key) { |
| 402 | s = 0; |
| 403 | goto out; |
| 404 | } else if (nkey < key) { |
| 405 | low = index + 1; |
| 406 | s = -1; |
| 407 | } else { |
| 408 | high = index - 1; |
| 409 | s = 1; |
| 410 | } |
| 411 | } |
| 412 | |
| 413 | /* adjust index */ |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 414 | if (nilfs_btree_node_get_level(node) > NILFS_BTREE_LEVEL_NODE_MIN) { |
| 415 | if (s > 0 && index > 0) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 416 | index--; |
| 417 | } else if (s < 0) |
| 418 | index++; |
| 419 | |
| 420 | out: |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 421 | *indexp = index; |
| 422 | |
| 423 | return s == 0; |
| 424 | } |
| 425 | |
| 426 | static inline struct nilfs_btree_node * |
| 427 | nilfs_btree_get_root(const struct nilfs_btree *btree) |
| 428 | { |
| 429 | return (struct nilfs_btree_node *)btree->bt_bmap.b_u.u_data; |
| 430 | } |
| 431 | |
| 432 | static inline struct nilfs_btree_node * |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 433 | 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] | 434 | { |
| 435 | return (struct nilfs_btree_node *)path[level].bp_bh->b_data; |
| 436 | } |
| 437 | |
| 438 | static inline struct nilfs_btree_node * |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 439 | 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] | 440 | { |
| 441 | return (struct nilfs_btree_node *)path[level].bp_sib_bh->b_data; |
| 442 | } |
| 443 | |
| 444 | static inline int nilfs_btree_height(const struct nilfs_btree *btree) |
| 445 | { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 446 | return nilfs_btree_node_get_level(nilfs_btree_get_root(btree)) + 1; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 447 | } |
| 448 | |
| 449 | static inline struct nilfs_btree_node * |
| 450 | nilfs_btree_get_node(const struct nilfs_btree *btree, |
| 451 | const struct nilfs_btree_path *path, |
| 452 | int level) |
| 453 | { |
| 454 | return (level == nilfs_btree_height(btree) - 1) ? |
| 455 | nilfs_btree_get_root(btree) : |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 456 | nilfs_btree_get_nonroot_node(path, level); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 457 | } |
| 458 | |
| 459 | static int nilfs_btree_do_lookup(const struct nilfs_btree *btree, |
| 460 | struct nilfs_btree_path *path, |
| 461 | __u64 key, __u64 *ptrp, int minlevel) |
| 462 | { |
| 463 | struct nilfs_btree_node *node; |
| 464 | __u64 ptr; |
| 465 | int level, index, found, ret; |
| 466 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 467 | node = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 468 | level = nilfs_btree_node_get_level(node); |
| 469 | if (level < minlevel || nilfs_btree_node_get_nchildren(node) <= 0) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 470 | return -ENOENT; |
| 471 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 472 | found = nilfs_btree_node_lookup(node, key, &index); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 473 | ptr = nilfs_btree_node_get_ptr(btree, node, index); |
| 474 | path[level].bp_bh = NULL; |
| 475 | path[level].bp_index = index; |
| 476 | |
| 477 | for (level--; level >= minlevel; level--) { |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 478 | ret = nilfs_btree_get_block(btree, ptr, &path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 479 | if (ret < 0) |
| 480 | return ret; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 481 | node = nilfs_btree_get_nonroot_node(path, level); |
| 482 | BUG_ON(level != nilfs_btree_node_get_level(node)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 483 | if (!found) |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 484 | found = nilfs_btree_node_lookup(node, key, &index); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 485 | else |
| 486 | index = 0; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 487 | if (index < nilfs_btree_node_nchildren_max(node, btree)) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 488 | ptr = nilfs_btree_node_get_ptr(btree, node, index); |
| 489 | else { |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 490 | WARN_ON(found || level != NILFS_BTREE_LEVEL_NODE_MIN); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 491 | /* insert */ |
| 492 | ptr = NILFS_BMAP_INVALID_PTR; |
| 493 | } |
| 494 | path[level].bp_index = index; |
| 495 | } |
| 496 | if (!found) |
| 497 | return -ENOENT; |
| 498 | |
| 499 | if (ptrp != NULL) |
| 500 | *ptrp = ptr; |
| 501 | |
| 502 | return 0; |
| 503 | } |
| 504 | |
| 505 | static int nilfs_btree_do_lookup_last(const struct nilfs_btree *btree, |
| 506 | struct nilfs_btree_path *path, |
| 507 | __u64 *keyp, __u64 *ptrp) |
| 508 | { |
| 509 | struct nilfs_btree_node *node; |
| 510 | __u64 ptr; |
| 511 | int index, level, ret; |
| 512 | |
| 513 | node = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 514 | index = nilfs_btree_node_get_nchildren(node) - 1; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 515 | if (index < 0) |
| 516 | return -ENOENT; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 517 | level = nilfs_btree_node_get_level(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 518 | ptr = nilfs_btree_node_get_ptr(btree, node, index); |
| 519 | path[level].bp_bh = NULL; |
| 520 | path[level].bp_index = index; |
| 521 | |
| 522 | for (level--; level > 0; level--) { |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 523 | ret = nilfs_btree_get_block(btree, ptr, &path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 524 | if (ret < 0) |
| 525 | return ret; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 526 | node = nilfs_btree_get_nonroot_node(path, level); |
| 527 | BUG_ON(level != nilfs_btree_node_get_level(node)); |
| 528 | index = nilfs_btree_node_get_nchildren(node) - 1; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 529 | ptr = nilfs_btree_node_get_ptr(btree, node, index); |
| 530 | path[level].bp_index = index; |
| 531 | } |
| 532 | |
| 533 | if (keyp != NULL) |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 534 | *keyp = nilfs_btree_node_get_key(node, index); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 535 | if (ptrp != NULL) |
| 536 | *ptrp = ptr; |
| 537 | |
| 538 | return 0; |
| 539 | } |
| 540 | |
| 541 | static int nilfs_btree_lookup(const struct nilfs_bmap *bmap, |
| 542 | __u64 key, int level, __u64 *ptrp) |
| 543 | { |
| 544 | struct nilfs_btree *btree; |
| 545 | struct nilfs_btree_path *path; |
| 546 | __u64 ptr; |
| 547 | int ret; |
| 548 | |
| 549 | btree = (struct nilfs_btree *)bmap; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 550 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 551 | if (path == NULL) |
| 552 | return -ENOMEM; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 553 | nilfs_btree_init_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 554 | |
| 555 | ret = nilfs_btree_do_lookup(btree, path, key, &ptr, level); |
| 556 | |
| 557 | if (ptrp != NULL) |
| 558 | *ptrp = ptr; |
| 559 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 560 | nilfs_btree_clear_path(path); |
| 561 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 562 | |
| 563 | return ret; |
| 564 | } |
| 565 | |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 566 | static int nilfs_btree_lookup_contig(const struct nilfs_bmap *bmap, |
| 567 | __u64 key, __u64 *ptrp, unsigned maxblocks) |
| 568 | { |
| 569 | struct nilfs_btree *btree = (struct nilfs_btree *)bmap; |
| 570 | struct nilfs_btree_path *path; |
| 571 | struct nilfs_btree_node *node; |
| 572 | struct inode *dat = NULL; |
| 573 | __u64 ptr, ptr2; |
| 574 | sector_t blocknr; |
| 575 | int level = NILFS_BTREE_LEVEL_NODE_MIN; |
| 576 | int ret, cnt, index, maxlevel; |
| 577 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 578 | path = nilfs_btree_alloc_path(); |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 579 | if (path == NULL) |
| 580 | return -ENOMEM; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 581 | nilfs_btree_init_path(path); |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 582 | ret = nilfs_btree_do_lookup(btree, path, key, &ptr, level); |
| 583 | if (ret < 0) |
| 584 | goto out; |
| 585 | |
| 586 | if (NILFS_BMAP_USE_VBN(bmap)) { |
| 587 | dat = nilfs_bmap_get_dat(bmap); |
| 588 | ret = nilfs_dat_translate(dat, ptr, &blocknr); |
| 589 | if (ret < 0) |
| 590 | goto out; |
| 591 | ptr = blocknr; |
| 592 | } |
| 593 | cnt = 1; |
| 594 | if (cnt == maxblocks) |
| 595 | goto end; |
| 596 | |
| 597 | maxlevel = nilfs_btree_height(btree) - 1; |
| 598 | node = nilfs_btree_get_node(btree, path, level); |
| 599 | index = path[level].bp_index + 1; |
| 600 | for (;;) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 601 | while (index < nilfs_btree_node_get_nchildren(node)) { |
| 602 | if (nilfs_btree_node_get_key(node, index) != |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 603 | key + cnt) |
| 604 | goto end; |
| 605 | ptr2 = nilfs_btree_node_get_ptr(btree, node, index); |
| 606 | if (dat) { |
| 607 | ret = nilfs_dat_translate(dat, ptr2, &blocknr); |
| 608 | if (ret < 0) |
| 609 | goto out; |
| 610 | ptr2 = blocknr; |
| 611 | } |
| 612 | if (ptr2 != ptr + cnt || ++cnt == maxblocks) |
| 613 | goto end; |
| 614 | index++; |
| 615 | continue; |
| 616 | } |
| 617 | if (level == maxlevel) |
| 618 | break; |
| 619 | |
| 620 | /* look-up right sibling node */ |
| 621 | node = nilfs_btree_get_node(btree, path, level + 1); |
| 622 | index = path[level + 1].bp_index + 1; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 623 | if (index >= nilfs_btree_node_get_nchildren(node) || |
| 624 | nilfs_btree_node_get_key(node, index) != key + cnt) |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 625 | break; |
| 626 | ptr2 = nilfs_btree_node_get_ptr(btree, node, index); |
| 627 | path[level + 1].bp_index = index; |
| 628 | |
| 629 | brelse(path[level].bp_bh); |
| 630 | path[level].bp_bh = NULL; |
| 631 | ret = nilfs_btree_get_block(btree, ptr2, &path[level].bp_bh); |
| 632 | if (ret < 0) |
| 633 | goto out; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 634 | node = nilfs_btree_get_nonroot_node(path, level); |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 635 | index = 0; |
| 636 | path[level].bp_index = index; |
| 637 | } |
| 638 | end: |
| 639 | *ptrp = ptr; |
| 640 | ret = cnt; |
| 641 | out: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 642 | nilfs_btree_clear_path(path); |
| 643 | nilfs_btree_free_path(path); |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 644 | return ret; |
| 645 | } |
| 646 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 647 | static void nilfs_btree_promote_key(struct nilfs_btree *btree, |
| 648 | struct nilfs_btree_path *path, |
| 649 | int level, __u64 key) |
| 650 | { |
| 651 | if (level < nilfs_btree_height(btree) - 1) { |
| 652 | do { |
| 653 | lock_buffer(path[level].bp_bh); |
| 654 | nilfs_btree_node_set_key( |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 655 | nilfs_btree_get_nonroot_node(path, level), |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 656 | path[level].bp_index, key); |
| 657 | if (!buffer_dirty(path[level].bp_bh)) |
| 658 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 659 | unlock_buffer(path[level].bp_bh); |
| 660 | } while ((path[level].bp_index == 0) && |
| 661 | (++level < nilfs_btree_height(btree) - 1)); |
| 662 | } |
| 663 | |
| 664 | /* root */ |
| 665 | if (level == nilfs_btree_height(btree) - 1) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 666 | nilfs_btree_node_set_key(nilfs_btree_get_root(btree), |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 667 | path[level].bp_index, key); |
| 668 | } |
| 669 | } |
| 670 | |
| 671 | static void nilfs_btree_do_insert(struct nilfs_btree *btree, |
| 672 | struct nilfs_btree_path *path, |
| 673 | int level, __u64 *keyp, __u64 *ptrp) |
| 674 | { |
| 675 | struct nilfs_btree_node *node; |
| 676 | |
| 677 | if (level < nilfs_btree_height(btree) - 1) { |
| 678 | lock_buffer(path[level].bp_bh); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 679 | node = nilfs_btree_get_nonroot_node(path, level); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 680 | nilfs_btree_node_insert(btree, node, *keyp, *ptrp, |
| 681 | path[level].bp_index); |
| 682 | if (!buffer_dirty(path[level].bp_bh)) |
| 683 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 684 | unlock_buffer(path[level].bp_bh); |
| 685 | |
| 686 | if (path[level].bp_index == 0) |
| 687 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 688 | nilfs_btree_node_get_key(node, |
| 689 | 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 690 | } else { |
| 691 | node = nilfs_btree_get_root(btree); |
| 692 | nilfs_btree_node_insert(btree, node, *keyp, *ptrp, |
| 693 | path[level].bp_index); |
| 694 | } |
| 695 | } |
| 696 | |
| 697 | static void nilfs_btree_carry_left(struct nilfs_btree *btree, |
| 698 | struct nilfs_btree_path *path, |
| 699 | int level, __u64 *keyp, __u64 *ptrp) |
| 700 | { |
| 701 | struct nilfs_btree_node *node, *left; |
| 702 | int nchildren, lnchildren, n, move; |
| 703 | |
| 704 | lock_buffer(path[level].bp_bh); |
| 705 | lock_buffer(path[level].bp_sib_bh); |
| 706 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 707 | node = nilfs_btree_get_nonroot_node(path, level); |
| 708 | left = nilfs_btree_get_sib_node(path, level); |
| 709 | nchildren = nilfs_btree_node_get_nchildren(node); |
| 710 | lnchildren = nilfs_btree_node_get_nchildren(left); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 711 | move = 0; |
| 712 | |
| 713 | n = (nchildren + lnchildren + 1) / 2 - lnchildren; |
| 714 | if (n > path[level].bp_index) { |
| 715 | /* move insert point */ |
| 716 | n--; |
| 717 | move = 1; |
| 718 | } |
| 719 | |
| 720 | nilfs_btree_node_move_left(btree, left, node, n); |
| 721 | |
| 722 | if (!buffer_dirty(path[level].bp_bh)) |
| 723 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 724 | if (!buffer_dirty(path[level].bp_sib_bh)) |
| 725 | nilfs_btnode_mark_dirty(path[level].bp_sib_bh); |
| 726 | |
| 727 | unlock_buffer(path[level].bp_bh); |
| 728 | unlock_buffer(path[level].bp_sib_bh); |
| 729 | |
| 730 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 731 | nilfs_btree_node_get_key(node, 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 732 | |
| 733 | if (move) { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 734 | brelse(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 735 | path[level].bp_bh = path[level].bp_sib_bh; |
| 736 | path[level].bp_sib_bh = NULL; |
| 737 | path[level].bp_index += lnchildren; |
| 738 | path[level + 1].bp_index--; |
| 739 | } else { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 740 | brelse(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 741 | path[level].bp_sib_bh = NULL; |
| 742 | path[level].bp_index -= n; |
| 743 | } |
| 744 | |
| 745 | nilfs_btree_do_insert(btree, path, level, keyp, ptrp); |
| 746 | } |
| 747 | |
| 748 | static void nilfs_btree_carry_right(struct nilfs_btree *btree, |
| 749 | struct nilfs_btree_path *path, |
| 750 | int level, __u64 *keyp, __u64 *ptrp) |
| 751 | { |
| 752 | struct nilfs_btree_node *node, *right; |
| 753 | int nchildren, rnchildren, n, move; |
| 754 | |
| 755 | lock_buffer(path[level].bp_bh); |
| 756 | lock_buffer(path[level].bp_sib_bh); |
| 757 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 758 | node = nilfs_btree_get_nonroot_node(path, level); |
| 759 | right = nilfs_btree_get_sib_node(path, level); |
| 760 | nchildren = nilfs_btree_node_get_nchildren(node); |
| 761 | rnchildren = nilfs_btree_node_get_nchildren(right); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 762 | move = 0; |
| 763 | |
| 764 | n = (nchildren + rnchildren + 1) / 2 - rnchildren; |
| 765 | if (n > nchildren - path[level].bp_index) { |
| 766 | /* move insert point */ |
| 767 | n--; |
| 768 | move = 1; |
| 769 | } |
| 770 | |
| 771 | nilfs_btree_node_move_right(btree, node, right, n); |
| 772 | |
| 773 | if (!buffer_dirty(path[level].bp_bh)) |
| 774 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 775 | if (!buffer_dirty(path[level].bp_sib_bh)) |
| 776 | nilfs_btnode_mark_dirty(path[level].bp_sib_bh); |
| 777 | |
| 778 | unlock_buffer(path[level].bp_bh); |
| 779 | unlock_buffer(path[level].bp_sib_bh); |
| 780 | |
| 781 | path[level + 1].bp_index++; |
| 782 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 783 | nilfs_btree_node_get_key(right, 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 784 | path[level + 1].bp_index--; |
| 785 | |
| 786 | if (move) { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 787 | brelse(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 788 | path[level].bp_bh = path[level].bp_sib_bh; |
| 789 | path[level].bp_sib_bh = NULL; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 790 | path[level].bp_index -= nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 791 | path[level + 1].bp_index++; |
| 792 | } else { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 793 | brelse(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 794 | path[level].bp_sib_bh = NULL; |
| 795 | } |
| 796 | |
| 797 | nilfs_btree_do_insert(btree, path, level, keyp, ptrp); |
| 798 | } |
| 799 | |
| 800 | static void nilfs_btree_split(struct nilfs_btree *btree, |
| 801 | struct nilfs_btree_path *path, |
| 802 | int level, __u64 *keyp, __u64 *ptrp) |
| 803 | { |
| 804 | struct nilfs_btree_node *node, *right; |
| 805 | __u64 newkey; |
| 806 | __u64 newptr; |
| 807 | int nchildren, n, move; |
| 808 | |
| 809 | lock_buffer(path[level].bp_bh); |
| 810 | lock_buffer(path[level].bp_sib_bh); |
| 811 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 812 | node = nilfs_btree_get_nonroot_node(path, level); |
| 813 | right = nilfs_btree_get_sib_node(path, level); |
| 814 | nchildren = nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 815 | move = 0; |
| 816 | |
| 817 | n = (nchildren + 1) / 2; |
| 818 | if (n > nchildren - path[level].bp_index) { |
| 819 | n--; |
| 820 | move = 1; |
| 821 | } |
| 822 | |
| 823 | nilfs_btree_node_move_right(btree, node, right, n); |
| 824 | |
| 825 | if (!buffer_dirty(path[level].bp_bh)) |
| 826 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 827 | if (!buffer_dirty(path[level].bp_sib_bh)) |
| 828 | nilfs_btnode_mark_dirty(path[level].bp_sib_bh); |
| 829 | |
| 830 | unlock_buffer(path[level].bp_bh); |
| 831 | unlock_buffer(path[level].bp_sib_bh); |
| 832 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 833 | newkey = nilfs_btree_node_get_key(right, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 834 | newptr = path[level].bp_newreq.bpr_ptr; |
| 835 | |
| 836 | if (move) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 837 | path[level].bp_index -= nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 838 | nilfs_btree_node_insert(btree, right, *keyp, *ptrp, |
| 839 | path[level].bp_index); |
| 840 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 841 | *keyp = nilfs_btree_node_get_key(right, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 842 | *ptrp = path[level].bp_newreq.bpr_ptr; |
| 843 | |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 844 | brelse(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 845 | path[level].bp_bh = path[level].bp_sib_bh; |
| 846 | path[level].bp_sib_bh = NULL; |
| 847 | } else { |
| 848 | nilfs_btree_do_insert(btree, path, level, keyp, ptrp); |
| 849 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 850 | *keyp = nilfs_btree_node_get_key(right, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 851 | *ptrp = path[level].bp_newreq.bpr_ptr; |
| 852 | |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 853 | brelse(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 854 | path[level].bp_sib_bh = NULL; |
| 855 | } |
| 856 | |
| 857 | path[level + 1].bp_index++; |
| 858 | } |
| 859 | |
| 860 | static void nilfs_btree_grow(struct nilfs_btree *btree, |
| 861 | struct nilfs_btree_path *path, |
| 862 | int level, __u64 *keyp, __u64 *ptrp) |
| 863 | { |
| 864 | struct nilfs_btree_node *root, *child; |
| 865 | int n; |
| 866 | |
| 867 | lock_buffer(path[level].bp_sib_bh); |
| 868 | |
| 869 | root = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 870 | child = nilfs_btree_get_sib_node(path, level); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 871 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 872 | n = nilfs_btree_node_get_nchildren(root); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 873 | |
| 874 | nilfs_btree_node_move_right(btree, root, child, n); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 875 | nilfs_btree_node_set_level(root, level + 1); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 876 | |
| 877 | if (!buffer_dirty(path[level].bp_sib_bh)) |
| 878 | nilfs_btnode_mark_dirty(path[level].bp_sib_bh); |
| 879 | |
| 880 | unlock_buffer(path[level].bp_sib_bh); |
| 881 | |
| 882 | path[level].bp_bh = path[level].bp_sib_bh; |
| 883 | path[level].bp_sib_bh = NULL; |
| 884 | |
| 885 | nilfs_btree_do_insert(btree, path, level, keyp, ptrp); |
| 886 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 887 | *keyp = nilfs_btree_node_get_key(child, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 888 | *ptrp = path[level].bp_newreq.bpr_ptr; |
| 889 | } |
| 890 | |
| 891 | static __u64 nilfs_btree_find_near(const struct nilfs_btree *btree, |
| 892 | const struct nilfs_btree_path *path) |
| 893 | { |
| 894 | struct nilfs_btree_node *node; |
| 895 | int level; |
| 896 | |
| 897 | if (path == NULL) |
| 898 | return NILFS_BMAP_INVALID_PTR; |
| 899 | |
| 900 | /* left sibling */ |
| 901 | level = NILFS_BTREE_LEVEL_NODE_MIN; |
| 902 | if (path[level].bp_index > 0) { |
| 903 | node = nilfs_btree_get_node(btree, path, level); |
| 904 | return nilfs_btree_node_get_ptr(btree, node, |
| 905 | path[level].bp_index - 1); |
| 906 | } |
| 907 | |
| 908 | /* parent */ |
| 909 | level = NILFS_BTREE_LEVEL_NODE_MIN + 1; |
| 910 | if (level <= nilfs_btree_height(btree) - 1) { |
| 911 | node = nilfs_btree_get_node(btree, path, level); |
| 912 | return nilfs_btree_node_get_ptr(btree, node, |
| 913 | path[level].bp_index); |
| 914 | } |
| 915 | |
| 916 | return NILFS_BMAP_INVALID_PTR; |
| 917 | } |
| 918 | |
| 919 | static __u64 nilfs_btree_find_target_v(const struct nilfs_btree *btree, |
| 920 | const struct nilfs_btree_path *path, |
| 921 | __u64 key) |
| 922 | { |
| 923 | __u64 ptr; |
| 924 | |
| 925 | ptr = nilfs_bmap_find_target_seq(&btree->bt_bmap, key); |
| 926 | if (ptr != NILFS_BMAP_INVALID_PTR) |
| 927 | /* sequential access */ |
| 928 | return ptr; |
| 929 | else { |
| 930 | ptr = nilfs_btree_find_near(btree, path); |
| 931 | if (ptr != NILFS_BMAP_INVALID_PTR) |
| 932 | /* near */ |
| 933 | return ptr; |
| 934 | } |
| 935 | /* block group */ |
| 936 | return nilfs_bmap_find_target_in_group(&btree->bt_bmap); |
| 937 | } |
| 938 | |
| 939 | static void nilfs_btree_set_target_v(struct nilfs_btree *btree, __u64 key, |
| 940 | __u64 ptr) |
| 941 | { |
| 942 | btree->bt_bmap.b_last_allocated_key = key; |
| 943 | btree->bt_bmap.b_last_allocated_ptr = ptr; |
| 944 | } |
| 945 | |
| 946 | static int nilfs_btree_prepare_insert(struct nilfs_btree *btree, |
| 947 | struct nilfs_btree_path *path, |
| 948 | int *levelp, __u64 key, __u64 ptr, |
| 949 | struct nilfs_bmap_stats *stats) |
| 950 | { |
| 951 | struct buffer_head *bh; |
| 952 | struct nilfs_btree_node *node, *parent, *sib; |
| 953 | __u64 sibptr; |
| 954 | int pindex, level, ret; |
| 955 | |
| 956 | stats->bs_nblocks = 0; |
| 957 | level = NILFS_BTREE_LEVEL_DATA; |
| 958 | |
| 959 | /* allocate a new ptr for data block */ |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 960 | if (NILFS_BMAP_USE_VBN(&btree->bt_bmap)) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 961 | path[level].bp_newreq.bpr_ptr = |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 962 | nilfs_btree_find_target_v(btree, path, key); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 963 | |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 964 | ret = nilfs_bmap_prepare_alloc_ptr(&btree->bt_bmap, |
| 965 | &path[level].bp_newreq); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 966 | if (ret < 0) |
| 967 | goto err_out_data; |
| 968 | |
| 969 | for (level = NILFS_BTREE_LEVEL_NODE_MIN; |
| 970 | level < nilfs_btree_height(btree) - 1; |
| 971 | level++) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 972 | node = nilfs_btree_get_nonroot_node(path, level); |
| 973 | if (nilfs_btree_node_get_nchildren(node) < |
| 974 | nilfs_btree_node_nchildren_max(node, btree)) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 975 | path[level].bp_op = nilfs_btree_do_insert; |
| 976 | stats->bs_nblocks++; |
| 977 | goto out; |
| 978 | } |
| 979 | |
| 980 | parent = nilfs_btree_get_node(btree, path, level + 1); |
| 981 | pindex = path[level + 1].bp_index; |
| 982 | |
| 983 | /* left sibling */ |
| 984 | if (pindex > 0) { |
| 985 | sibptr = nilfs_btree_node_get_ptr(btree, parent, |
| 986 | pindex - 1); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 987 | ret = nilfs_btree_get_block(btree, sibptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 988 | if (ret < 0) |
| 989 | goto err_out_child_node; |
| 990 | sib = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 991 | if (nilfs_btree_node_get_nchildren(sib) < |
| 992 | nilfs_btree_node_nchildren_max(sib, btree)) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 993 | path[level].bp_sib_bh = bh; |
| 994 | path[level].bp_op = nilfs_btree_carry_left; |
| 995 | stats->bs_nblocks++; |
| 996 | goto out; |
| 997 | } else |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 998 | brelse(bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 999 | } |
| 1000 | |
| 1001 | /* right sibling */ |
| 1002 | if (pindex < |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1003 | nilfs_btree_node_get_nchildren(parent) - 1) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1004 | sibptr = nilfs_btree_node_get_ptr(btree, parent, |
| 1005 | pindex + 1); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1006 | ret = nilfs_btree_get_block(btree, sibptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1007 | if (ret < 0) |
| 1008 | goto err_out_child_node; |
| 1009 | sib = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1010 | if (nilfs_btree_node_get_nchildren(sib) < |
| 1011 | nilfs_btree_node_nchildren_max(sib, btree)) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1012 | path[level].bp_sib_bh = bh; |
| 1013 | path[level].bp_op = nilfs_btree_carry_right; |
| 1014 | stats->bs_nblocks++; |
| 1015 | goto out; |
| 1016 | } else |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1017 | brelse(bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1018 | } |
| 1019 | |
| 1020 | /* split */ |
| 1021 | path[level].bp_newreq.bpr_ptr = |
| 1022 | path[level - 1].bp_newreq.bpr_ptr + 1; |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1023 | ret = nilfs_bmap_prepare_alloc_ptr(&btree->bt_bmap, |
| 1024 | &path[level].bp_newreq); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1025 | if (ret < 0) |
| 1026 | goto err_out_child_node; |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1027 | ret = nilfs_btree_get_new_block(btree, |
| 1028 | path[level].bp_newreq.bpr_ptr, |
| 1029 | &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1030 | if (ret < 0) |
| 1031 | goto err_out_curr_node; |
| 1032 | |
| 1033 | stats->bs_nblocks++; |
| 1034 | |
| 1035 | lock_buffer(bh); |
| 1036 | nilfs_btree_node_init(btree, |
| 1037 | (struct nilfs_btree_node *)bh->b_data, |
| 1038 | 0, level, 0, NULL, NULL); |
| 1039 | unlock_buffer(bh); |
| 1040 | path[level].bp_sib_bh = bh; |
| 1041 | path[level].bp_op = nilfs_btree_split; |
| 1042 | } |
| 1043 | |
| 1044 | /* root */ |
| 1045 | node = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1046 | if (nilfs_btree_node_get_nchildren(node) < |
| 1047 | nilfs_btree_node_nchildren_max(node, btree)) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1048 | path[level].bp_op = nilfs_btree_do_insert; |
| 1049 | stats->bs_nblocks++; |
| 1050 | goto out; |
| 1051 | } |
| 1052 | |
| 1053 | /* grow */ |
| 1054 | 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] | 1055 | ret = nilfs_bmap_prepare_alloc_ptr(&btree->bt_bmap, |
| 1056 | &path[level].bp_newreq); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1057 | if (ret < 0) |
| 1058 | goto err_out_child_node; |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1059 | ret = nilfs_btree_get_new_block(btree, path[level].bp_newreq.bpr_ptr, |
| 1060 | &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1061 | if (ret < 0) |
| 1062 | goto err_out_curr_node; |
| 1063 | |
| 1064 | lock_buffer(bh); |
| 1065 | nilfs_btree_node_init(btree, (struct nilfs_btree_node *)bh->b_data, |
| 1066 | 0, level, 0, NULL, NULL); |
| 1067 | unlock_buffer(bh); |
| 1068 | path[level].bp_sib_bh = bh; |
| 1069 | path[level].bp_op = nilfs_btree_grow; |
| 1070 | |
| 1071 | level++; |
| 1072 | path[level].bp_op = nilfs_btree_do_insert; |
| 1073 | |
| 1074 | /* a newly-created node block and a data block are added */ |
| 1075 | stats->bs_nblocks += 2; |
| 1076 | |
| 1077 | /* success */ |
| 1078 | out: |
| 1079 | *levelp = level; |
| 1080 | return ret; |
| 1081 | |
| 1082 | /* error */ |
| 1083 | err_out_curr_node: |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1084 | nilfs_bmap_abort_alloc_ptr(&btree->bt_bmap, &path[level].bp_newreq); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1085 | err_out_child_node: |
| 1086 | for (level--; level > NILFS_BTREE_LEVEL_DATA; level--) { |
Ryusuke Konishi | 9f09890 | 2009-05-22 00:38:56 +0900 | [diff] [blame] | 1087 | nilfs_btnode_delete(path[level].bp_sib_bh); |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1088 | nilfs_bmap_abort_alloc_ptr(&btree->bt_bmap, |
| 1089 | &path[level].bp_newreq); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1090 | |
| 1091 | } |
| 1092 | |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1093 | nilfs_bmap_abort_alloc_ptr(&btree->bt_bmap, &path[level].bp_newreq); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1094 | err_out_data: |
| 1095 | *levelp = level; |
| 1096 | stats->bs_nblocks = 0; |
| 1097 | return ret; |
| 1098 | } |
| 1099 | |
| 1100 | static void nilfs_btree_commit_insert(struct nilfs_btree *btree, |
| 1101 | struct nilfs_btree_path *path, |
| 1102 | int maxlevel, __u64 key, __u64 ptr) |
| 1103 | { |
| 1104 | int level; |
| 1105 | |
| 1106 | set_buffer_nilfs_volatile((struct buffer_head *)((unsigned long)ptr)); |
| 1107 | ptr = path[NILFS_BTREE_LEVEL_DATA].bp_newreq.bpr_ptr; |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 1108 | if (NILFS_BMAP_USE_VBN(&btree->bt_bmap)) |
| 1109 | nilfs_btree_set_target_v(btree, key, ptr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1110 | |
| 1111 | for (level = NILFS_BTREE_LEVEL_NODE_MIN; level <= maxlevel; level++) { |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1112 | nilfs_bmap_commit_alloc_ptr(&btree->bt_bmap, |
| 1113 | &path[level - 1].bp_newreq); |
Pekka Enberg | 8acfbf0 | 2009-04-06 19:01:49 -0700 | [diff] [blame] | 1114 | path[level].bp_op(btree, path, level, &key, &ptr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1115 | } |
| 1116 | |
| 1117 | if (!nilfs_bmap_dirty(&btree->bt_bmap)) |
| 1118 | nilfs_bmap_set_dirty(&btree->bt_bmap); |
| 1119 | } |
| 1120 | |
| 1121 | static int nilfs_btree_insert(struct nilfs_bmap *bmap, __u64 key, __u64 ptr) |
| 1122 | { |
| 1123 | struct nilfs_btree *btree; |
| 1124 | struct nilfs_btree_path *path; |
| 1125 | struct nilfs_bmap_stats stats; |
| 1126 | int level, ret; |
| 1127 | |
| 1128 | btree = (struct nilfs_btree *)bmap; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1129 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1130 | if (path == NULL) |
| 1131 | return -ENOMEM; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1132 | nilfs_btree_init_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1133 | |
| 1134 | ret = nilfs_btree_do_lookup(btree, path, key, NULL, |
| 1135 | NILFS_BTREE_LEVEL_NODE_MIN); |
| 1136 | if (ret != -ENOENT) { |
| 1137 | if (ret == 0) |
| 1138 | ret = -EEXIST; |
| 1139 | goto out; |
| 1140 | } |
| 1141 | |
| 1142 | ret = nilfs_btree_prepare_insert(btree, path, &level, key, ptr, &stats); |
| 1143 | if (ret < 0) |
| 1144 | goto out; |
| 1145 | nilfs_btree_commit_insert(btree, path, level, key, ptr); |
| 1146 | nilfs_bmap_add_blocks(bmap, stats.bs_nblocks); |
| 1147 | |
| 1148 | out: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1149 | nilfs_btree_clear_path(path); |
| 1150 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1151 | return ret; |
| 1152 | } |
| 1153 | |
| 1154 | static void nilfs_btree_do_delete(struct nilfs_btree *btree, |
| 1155 | struct nilfs_btree_path *path, |
| 1156 | int level, __u64 *keyp, __u64 *ptrp) |
| 1157 | { |
| 1158 | struct nilfs_btree_node *node; |
| 1159 | |
| 1160 | if (level < nilfs_btree_height(btree) - 1) { |
| 1161 | lock_buffer(path[level].bp_bh); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1162 | node = nilfs_btree_get_nonroot_node(path, level); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1163 | nilfs_btree_node_delete(btree, node, keyp, ptrp, |
| 1164 | path[level].bp_index); |
| 1165 | if (!buffer_dirty(path[level].bp_bh)) |
| 1166 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 1167 | unlock_buffer(path[level].bp_bh); |
| 1168 | if (path[level].bp_index == 0) |
| 1169 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1170 | nilfs_btree_node_get_key(node, 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1171 | } else { |
| 1172 | node = nilfs_btree_get_root(btree); |
| 1173 | nilfs_btree_node_delete(btree, node, keyp, ptrp, |
| 1174 | path[level].bp_index); |
| 1175 | } |
| 1176 | } |
| 1177 | |
| 1178 | static void nilfs_btree_borrow_left(struct nilfs_btree *btree, |
| 1179 | struct nilfs_btree_path *path, |
| 1180 | int level, __u64 *keyp, __u64 *ptrp) |
| 1181 | { |
| 1182 | struct nilfs_btree_node *node, *left; |
| 1183 | int nchildren, lnchildren, n; |
| 1184 | |
| 1185 | nilfs_btree_do_delete(btree, path, level, keyp, ptrp); |
| 1186 | |
| 1187 | lock_buffer(path[level].bp_bh); |
| 1188 | lock_buffer(path[level].bp_sib_bh); |
| 1189 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1190 | node = nilfs_btree_get_nonroot_node(path, level); |
| 1191 | left = nilfs_btree_get_sib_node(path, level); |
| 1192 | nchildren = nilfs_btree_node_get_nchildren(node); |
| 1193 | lnchildren = nilfs_btree_node_get_nchildren(left); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1194 | |
| 1195 | n = (nchildren + lnchildren) / 2 - nchildren; |
| 1196 | |
| 1197 | nilfs_btree_node_move_right(btree, left, node, n); |
| 1198 | |
| 1199 | if (!buffer_dirty(path[level].bp_bh)) |
| 1200 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 1201 | if (!buffer_dirty(path[level].bp_sib_bh)) |
| 1202 | nilfs_btnode_mark_dirty(path[level].bp_sib_bh); |
| 1203 | |
| 1204 | unlock_buffer(path[level].bp_bh); |
| 1205 | unlock_buffer(path[level].bp_sib_bh); |
| 1206 | |
| 1207 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1208 | nilfs_btree_node_get_key(node, 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1209 | |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1210 | brelse(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1211 | path[level].bp_sib_bh = NULL; |
| 1212 | path[level].bp_index += n; |
| 1213 | } |
| 1214 | |
| 1215 | static void nilfs_btree_borrow_right(struct nilfs_btree *btree, |
| 1216 | struct nilfs_btree_path *path, |
| 1217 | int level, __u64 *keyp, __u64 *ptrp) |
| 1218 | { |
| 1219 | struct nilfs_btree_node *node, *right; |
| 1220 | int nchildren, rnchildren, n; |
| 1221 | |
| 1222 | nilfs_btree_do_delete(btree, path, level, keyp, ptrp); |
| 1223 | |
| 1224 | lock_buffer(path[level].bp_bh); |
| 1225 | lock_buffer(path[level].bp_sib_bh); |
| 1226 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1227 | node = nilfs_btree_get_nonroot_node(path, level); |
| 1228 | right = nilfs_btree_get_sib_node(path, level); |
| 1229 | nchildren = nilfs_btree_node_get_nchildren(node); |
| 1230 | rnchildren = nilfs_btree_node_get_nchildren(right); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1231 | |
| 1232 | n = (nchildren + rnchildren) / 2 - nchildren; |
| 1233 | |
| 1234 | nilfs_btree_node_move_left(btree, node, right, n); |
| 1235 | |
| 1236 | if (!buffer_dirty(path[level].bp_bh)) |
| 1237 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 1238 | if (!buffer_dirty(path[level].bp_sib_bh)) |
| 1239 | nilfs_btnode_mark_dirty(path[level].bp_sib_bh); |
| 1240 | |
| 1241 | unlock_buffer(path[level].bp_bh); |
| 1242 | unlock_buffer(path[level].bp_sib_bh); |
| 1243 | |
| 1244 | path[level + 1].bp_index++; |
| 1245 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1246 | nilfs_btree_node_get_key(right, 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1247 | path[level + 1].bp_index--; |
| 1248 | |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1249 | brelse(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1250 | path[level].bp_sib_bh = NULL; |
| 1251 | } |
| 1252 | |
| 1253 | static void nilfs_btree_concat_left(struct nilfs_btree *btree, |
| 1254 | struct nilfs_btree_path *path, |
| 1255 | int level, __u64 *keyp, __u64 *ptrp) |
| 1256 | { |
| 1257 | struct nilfs_btree_node *node, *left; |
| 1258 | int n; |
| 1259 | |
| 1260 | nilfs_btree_do_delete(btree, path, level, keyp, ptrp); |
| 1261 | |
| 1262 | lock_buffer(path[level].bp_bh); |
| 1263 | lock_buffer(path[level].bp_sib_bh); |
| 1264 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1265 | node = nilfs_btree_get_nonroot_node(path, level); |
| 1266 | left = nilfs_btree_get_sib_node(path, level); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1267 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1268 | n = nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1269 | |
| 1270 | nilfs_btree_node_move_left(btree, left, node, n); |
| 1271 | |
| 1272 | if (!buffer_dirty(path[level].bp_sib_bh)) |
| 1273 | nilfs_btnode_mark_dirty(path[level].bp_sib_bh); |
| 1274 | |
| 1275 | unlock_buffer(path[level].bp_bh); |
| 1276 | unlock_buffer(path[level].bp_sib_bh); |
| 1277 | |
Ryusuke Konishi | 9f09890 | 2009-05-22 00:38:56 +0900 | [diff] [blame] | 1278 | nilfs_btnode_delete(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1279 | path[level].bp_bh = path[level].bp_sib_bh; |
| 1280 | path[level].bp_sib_bh = NULL; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1281 | path[level].bp_index += nilfs_btree_node_get_nchildren(left); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1282 | } |
| 1283 | |
| 1284 | static void nilfs_btree_concat_right(struct nilfs_btree *btree, |
| 1285 | struct nilfs_btree_path *path, |
| 1286 | int level, __u64 *keyp, __u64 *ptrp) |
| 1287 | { |
| 1288 | struct nilfs_btree_node *node, *right; |
| 1289 | int n; |
| 1290 | |
| 1291 | nilfs_btree_do_delete(btree, path, level, keyp, ptrp); |
| 1292 | |
| 1293 | lock_buffer(path[level].bp_bh); |
| 1294 | lock_buffer(path[level].bp_sib_bh); |
| 1295 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1296 | node = nilfs_btree_get_nonroot_node(path, level); |
| 1297 | right = nilfs_btree_get_sib_node(path, level); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1298 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1299 | n = nilfs_btree_node_get_nchildren(right); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1300 | |
| 1301 | nilfs_btree_node_move_left(btree, node, right, n); |
| 1302 | |
| 1303 | if (!buffer_dirty(path[level].bp_bh)) |
| 1304 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 1305 | |
| 1306 | unlock_buffer(path[level].bp_bh); |
| 1307 | unlock_buffer(path[level].bp_sib_bh); |
| 1308 | |
Ryusuke Konishi | 9f09890 | 2009-05-22 00:38:56 +0900 | [diff] [blame] | 1309 | nilfs_btnode_delete(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1310 | path[level].bp_sib_bh = NULL; |
| 1311 | path[level + 1].bp_index++; |
| 1312 | } |
| 1313 | |
| 1314 | static void nilfs_btree_shrink(struct nilfs_btree *btree, |
| 1315 | struct nilfs_btree_path *path, |
| 1316 | int level, __u64 *keyp, __u64 *ptrp) |
| 1317 | { |
| 1318 | struct nilfs_btree_node *root, *child; |
| 1319 | int n; |
| 1320 | |
| 1321 | nilfs_btree_do_delete(btree, path, level, keyp, ptrp); |
| 1322 | |
| 1323 | lock_buffer(path[level].bp_bh); |
| 1324 | root = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1325 | child = nilfs_btree_get_nonroot_node(path, level); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1326 | |
| 1327 | nilfs_btree_node_delete(btree, root, NULL, NULL, 0); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1328 | nilfs_btree_node_set_level(root, level); |
| 1329 | n = nilfs_btree_node_get_nchildren(child); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1330 | nilfs_btree_node_move_left(btree, root, child, n); |
| 1331 | unlock_buffer(path[level].bp_bh); |
| 1332 | |
Ryusuke Konishi | 9f09890 | 2009-05-22 00:38:56 +0900 | [diff] [blame] | 1333 | nilfs_btnode_delete(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1334 | path[level].bp_bh = NULL; |
| 1335 | } |
| 1336 | |
| 1337 | |
| 1338 | static int nilfs_btree_prepare_delete(struct nilfs_btree *btree, |
| 1339 | struct nilfs_btree_path *path, |
| 1340 | int *levelp, |
| 1341 | struct nilfs_bmap_stats *stats) |
| 1342 | { |
| 1343 | struct buffer_head *bh; |
| 1344 | struct nilfs_btree_node *node, *parent, *sib; |
| 1345 | __u64 sibptr; |
| 1346 | int pindex, level, ret; |
| 1347 | |
| 1348 | ret = 0; |
| 1349 | stats->bs_nblocks = 0; |
| 1350 | for (level = NILFS_BTREE_LEVEL_NODE_MIN; |
| 1351 | level < nilfs_btree_height(btree) - 1; |
| 1352 | level++) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1353 | node = nilfs_btree_get_nonroot_node(path, level); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1354 | path[level].bp_oldreq.bpr_ptr = |
| 1355 | nilfs_btree_node_get_ptr(btree, node, |
| 1356 | path[level].bp_index); |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1357 | ret = nilfs_bmap_prepare_end_ptr(&btree->bt_bmap, |
| 1358 | &path[level].bp_oldreq); |
| 1359 | if (ret < 0) |
| 1360 | goto err_out_child_node; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1361 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1362 | if (nilfs_btree_node_get_nchildren(node) > |
| 1363 | nilfs_btree_node_nchildren_min(node, btree)) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1364 | path[level].bp_op = nilfs_btree_do_delete; |
| 1365 | stats->bs_nblocks++; |
| 1366 | goto out; |
| 1367 | } |
| 1368 | |
| 1369 | parent = nilfs_btree_get_node(btree, path, level + 1); |
| 1370 | pindex = path[level + 1].bp_index; |
| 1371 | |
| 1372 | if (pindex > 0) { |
| 1373 | /* left sibling */ |
| 1374 | sibptr = nilfs_btree_node_get_ptr(btree, parent, |
| 1375 | pindex - 1); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1376 | ret = nilfs_btree_get_block(btree, sibptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1377 | if (ret < 0) |
| 1378 | goto err_out_curr_node; |
| 1379 | sib = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1380 | if (nilfs_btree_node_get_nchildren(sib) > |
| 1381 | nilfs_btree_node_nchildren_min(sib, btree)) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1382 | path[level].bp_sib_bh = bh; |
| 1383 | path[level].bp_op = nilfs_btree_borrow_left; |
| 1384 | stats->bs_nblocks++; |
| 1385 | goto out; |
| 1386 | } else { |
| 1387 | path[level].bp_sib_bh = bh; |
| 1388 | path[level].bp_op = nilfs_btree_concat_left; |
| 1389 | stats->bs_nblocks++; |
| 1390 | /* continue; */ |
| 1391 | } |
| 1392 | } else if (pindex < |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1393 | nilfs_btree_node_get_nchildren(parent) - 1) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1394 | /* right sibling */ |
| 1395 | sibptr = nilfs_btree_node_get_ptr(btree, parent, |
| 1396 | pindex + 1); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1397 | ret = nilfs_btree_get_block(btree, sibptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1398 | if (ret < 0) |
| 1399 | goto err_out_curr_node; |
| 1400 | sib = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1401 | if (nilfs_btree_node_get_nchildren(sib) > |
| 1402 | nilfs_btree_node_nchildren_min(sib, btree)) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1403 | path[level].bp_sib_bh = bh; |
| 1404 | path[level].bp_op = nilfs_btree_borrow_right; |
| 1405 | stats->bs_nblocks++; |
| 1406 | goto out; |
| 1407 | } else { |
| 1408 | path[level].bp_sib_bh = bh; |
| 1409 | path[level].bp_op = nilfs_btree_concat_right; |
| 1410 | stats->bs_nblocks++; |
| 1411 | /* continue; */ |
| 1412 | } |
| 1413 | } else { |
| 1414 | /* no siblings */ |
| 1415 | /* the only child of the root node */ |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1416 | WARN_ON(level != nilfs_btree_height(btree) - 2); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1417 | if (nilfs_btree_node_get_nchildren(node) - 1 <= |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1418 | NILFS_BTREE_ROOT_NCHILDREN_MAX) { |
| 1419 | path[level].bp_op = nilfs_btree_shrink; |
| 1420 | stats->bs_nblocks += 2; |
| 1421 | } else { |
| 1422 | path[level].bp_op = nilfs_btree_do_delete; |
| 1423 | stats->bs_nblocks++; |
| 1424 | } |
| 1425 | |
| 1426 | goto out; |
| 1427 | |
| 1428 | } |
| 1429 | } |
| 1430 | |
| 1431 | node = nilfs_btree_get_root(btree); |
| 1432 | path[level].bp_oldreq.bpr_ptr = |
| 1433 | nilfs_btree_node_get_ptr(btree, node, path[level].bp_index); |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1434 | |
| 1435 | ret = nilfs_bmap_prepare_end_ptr(&btree->bt_bmap, |
| 1436 | &path[level].bp_oldreq); |
| 1437 | if (ret < 0) |
| 1438 | goto err_out_child_node; |
| 1439 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1440 | /* child of the root node is deleted */ |
| 1441 | path[level].bp_op = nilfs_btree_do_delete; |
| 1442 | stats->bs_nblocks++; |
| 1443 | |
| 1444 | /* success */ |
| 1445 | out: |
| 1446 | *levelp = level; |
| 1447 | return ret; |
| 1448 | |
| 1449 | /* error */ |
| 1450 | err_out_curr_node: |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1451 | nilfs_bmap_abort_end_ptr(&btree->bt_bmap, &path[level].bp_oldreq); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1452 | err_out_child_node: |
| 1453 | for (level--; level >= NILFS_BTREE_LEVEL_NODE_MIN; level--) { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1454 | brelse(path[level].bp_sib_bh); |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1455 | nilfs_bmap_abort_end_ptr(&btree->bt_bmap, |
| 1456 | &path[level].bp_oldreq); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1457 | } |
| 1458 | *levelp = level; |
| 1459 | stats->bs_nblocks = 0; |
| 1460 | return ret; |
| 1461 | } |
| 1462 | |
| 1463 | static void nilfs_btree_commit_delete(struct nilfs_btree *btree, |
| 1464 | struct nilfs_btree_path *path, |
| 1465 | int maxlevel) |
| 1466 | { |
| 1467 | int level; |
| 1468 | |
| 1469 | for (level = NILFS_BTREE_LEVEL_NODE_MIN; level <= maxlevel; level++) { |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1470 | nilfs_bmap_commit_end_ptr(&btree->bt_bmap, |
| 1471 | &path[level].bp_oldreq); |
Pekka Enberg | 8acfbf0 | 2009-04-06 19:01:49 -0700 | [diff] [blame] | 1472 | path[level].bp_op(btree, path, level, NULL, NULL); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1473 | } |
| 1474 | |
| 1475 | if (!nilfs_bmap_dirty(&btree->bt_bmap)) |
| 1476 | nilfs_bmap_set_dirty(&btree->bt_bmap); |
| 1477 | } |
| 1478 | |
| 1479 | static int nilfs_btree_delete(struct nilfs_bmap *bmap, __u64 key) |
| 1480 | |
| 1481 | { |
| 1482 | struct nilfs_btree *btree; |
| 1483 | struct nilfs_btree_path *path; |
| 1484 | struct nilfs_bmap_stats stats; |
| 1485 | int level, ret; |
| 1486 | |
| 1487 | btree = (struct nilfs_btree *)bmap; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1488 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1489 | if (path == NULL) |
| 1490 | return -ENOMEM; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1491 | nilfs_btree_init_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1492 | ret = nilfs_btree_do_lookup(btree, path, key, NULL, |
| 1493 | NILFS_BTREE_LEVEL_NODE_MIN); |
| 1494 | if (ret < 0) |
| 1495 | goto out; |
| 1496 | |
| 1497 | ret = nilfs_btree_prepare_delete(btree, path, &level, &stats); |
| 1498 | if (ret < 0) |
| 1499 | goto out; |
| 1500 | nilfs_btree_commit_delete(btree, path, level); |
| 1501 | nilfs_bmap_sub_blocks(bmap, stats.bs_nblocks); |
| 1502 | |
| 1503 | out: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1504 | nilfs_btree_clear_path(path); |
| 1505 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1506 | return ret; |
| 1507 | } |
| 1508 | |
| 1509 | static int nilfs_btree_last_key(const struct nilfs_bmap *bmap, __u64 *keyp) |
| 1510 | { |
| 1511 | struct nilfs_btree *btree; |
| 1512 | struct nilfs_btree_path *path; |
| 1513 | int ret; |
| 1514 | |
| 1515 | btree = (struct nilfs_btree *)bmap; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1516 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1517 | if (path == NULL) |
| 1518 | return -ENOMEM; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1519 | nilfs_btree_init_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1520 | |
| 1521 | ret = nilfs_btree_do_lookup_last(btree, path, keyp, NULL); |
| 1522 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1523 | nilfs_btree_clear_path(path); |
| 1524 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1525 | |
| 1526 | return ret; |
| 1527 | } |
| 1528 | |
| 1529 | static int nilfs_btree_check_delete(struct nilfs_bmap *bmap, __u64 key) |
| 1530 | { |
| 1531 | struct buffer_head *bh; |
| 1532 | struct nilfs_btree *btree; |
| 1533 | struct nilfs_btree_node *root, *node; |
| 1534 | __u64 maxkey, nextmaxkey; |
| 1535 | __u64 ptr; |
| 1536 | int nchildren, ret; |
| 1537 | |
| 1538 | btree = (struct nilfs_btree *)bmap; |
| 1539 | root = nilfs_btree_get_root(btree); |
| 1540 | switch (nilfs_btree_height(btree)) { |
| 1541 | case 2: |
| 1542 | bh = NULL; |
| 1543 | node = root; |
| 1544 | break; |
| 1545 | case 3: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1546 | nchildren = nilfs_btree_node_get_nchildren(root); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1547 | if (nchildren > 1) |
| 1548 | return 0; |
| 1549 | ptr = nilfs_btree_node_get_ptr(btree, root, nchildren - 1); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1550 | ret = nilfs_btree_get_block(btree, ptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1551 | if (ret < 0) |
| 1552 | return ret; |
| 1553 | node = (struct nilfs_btree_node *)bh->b_data; |
| 1554 | break; |
| 1555 | default: |
| 1556 | return 0; |
| 1557 | } |
| 1558 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1559 | nchildren = nilfs_btree_node_get_nchildren(node); |
| 1560 | maxkey = nilfs_btree_node_get_key(node, nchildren - 1); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1561 | nextmaxkey = (nchildren > 1) ? |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1562 | nilfs_btree_node_get_key(node, nchildren - 2) : 0; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1563 | if (bh != NULL) |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1564 | brelse(bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1565 | |
Ryusuke Konishi | 3033342 | 2009-05-24 00:09:44 +0900 | [diff] [blame] | 1566 | return (maxkey == key) && (nextmaxkey < NILFS_BMAP_LARGE_LOW); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1567 | } |
| 1568 | |
| 1569 | static int nilfs_btree_gather_data(struct nilfs_bmap *bmap, |
| 1570 | __u64 *keys, __u64 *ptrs, int nitems) |
| 1571 | { |
| 1572 | struct buffer_head *bh; |
| 1573 | struct nilfs_btree *btree; |
| 1574 | struct nilfs_btree_node *node, *root; |
| 1575 | __le64 *dkeys; |
| 1576 | __le64 *dptrs; |
| 1577 | __u64 ptr; |
| 1578 | int nchildren, i, ret; |
| 1579 | |
| 1580 | btree = (struct nilfs_btree *)bmap; |
| 1581 | root = nilfs_btree_get_root(btree); |
| 1582 | switch (nilfs_btree_height(btree)) { |
| 1583 | case 2: |
| 1584 | bh = NULL; |
| 1585 | node = root; |
| 1586 | break; |
| 1587 | case 3: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1588 | nchildren = nilfs_btree_node_get_nchildren(root); |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1589 | WARN_ON(nchildren > 1); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1590 | ptr = nilfs_btree_node_get_ptr(btree, root, nchildren - 1); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1591 | ret = nilfs_btree_get_block(btree, ptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1592 | if (ret < 0) |
| 1593 | return ret; |
| 1594 | node = (struct nilfs_btree_node *)bh->b_data; |
| 1595 | break; |
| 1596 | default: |
| 1597 | node = NULL; |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1598 | return -EINVAL; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1599 | } |
| 1600 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1601 | nchildren = nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1602 | if (nchildren < nitems) |
| 1603 | nitems = nchildren; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1604 | dkeys = nilfs_btree_node_dkeys(node); |
| 1605 | dptrs = nilfs_btree_node_dptrs(node, btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1606 | for (i = 0; i < nitems; i++) { |
| 1607 | keys[i] = nilfs_bmap_dkey_to_key(dkeys[i]); |
| 1608 | ptrs[i] = nilfs_bmap_dptr_to_ptr(dptrs[i]); |
| 1609 | } |
| 1610 | |
| 1611 | if (bh != NULL) |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1612 | brelse(bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1613 | |
| 1614 | return nitems; |
| 1615 | } |
| 1616 | |
| 1617 | static int |
| 1618 | nilfs_btree_prepare_convert_and_insert(struct nilfs_bmap *bmap, __u64 key, |
| 1619 | union nilfs_bmap_ptr_req *dreq, |
| 1620 | union nilfs_bmap_ptr_req *nreq, |
| 1621 | struct buffer_head **bhp, |
| 1622 | struct nilfs_bmap_stats *stats) |
| 1623 | { |
| 1624 | struct buffer_head *bh; |
| 1625 | struct nilfs_btree *btree; |
| 1626 | int ret; |
| 1627 | |
| 1628 | btree = (struct nilfs_btree *)bmap; |
| 1629 | stats->bs_nblocks = 0; |
| 1630 | |
| 1631 | /* for data */ |
| 1632 | /* cannot find near ptr */ |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 1633 | if (NILFS_BMAP_USE_VBN(bmap)) |
| 1634 | dreq->bpr_ptr = nilfs_btree_find_target_v(btree, NULL, key); |
| 1635 | |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1636 | ret = nilfs_bmap_prepare_alloc_ptr(bmap, dreq); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1637 | if (ret < 0) |
| 1638 | return ret; |
| 1639 | |
| 1640 | *bhp = NULL; |
| 1641 | stats->bs_nblocks++; |
| 1642 | if (nreq != NULL) { |
| 1643 | nreq->bpr_ptr = dreq->bpr_ptr + 1; |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1644 | ret = nilfs_bmap_prepare_alloc_ptr(bmap, nreq); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1645 | if (ret < 0) |
| 1646 | goto err_out_dreq; |
| 1647 | |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1648 | ret = nilfs_btree_get_new_block(btree, nreq->bpr_ptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1649 | if (ret < 0) |
| 1650 | goto err_out_nreq; |
| 1651 | |
| 1652 | *bhp = bh; |
| 1653 | stats->bs_nblocks++; |
| 1654 | } |
| 1655 | |
| 1656 | /* success */ |
| 1657 | return 0; |
| 1658 | |
| 1659 | /* error */ |
| 1660 | err_out_nreq: |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1661 | nilfs_bmap_abort_alloc_ptr(bmap, nreq); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1662 | err_out_dreq: |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1663 | nilfs_bmap_abort_alloc_ptr(bmap, dreq); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1664 | stats->bs_nblocks = 0; |
| 1665 | return ret; |
| 1666 | |
| 1667 | } |
| 1668 | |
| 1669 | static void |
| 1670 | nilfs_btree_commit_convert_and_insert(struct nilfs_bmap *bmap, |
| 1671 | __u64 key, __u64 ptr, |
| 1672 | const __u64 *keys, const __u64 *ptrs, |
Ryusuke Konishi | 3033342 | 2009-05-24 00:09:44 +0900 | [diff] [blame] | 1673 | int n, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1674 | union nilfs_bmap_ptr_req *dreq, |
| 1675 | union nilfs_bmap_ptr_req *nreq, |
| 1676 | struct buffer_head *bh) |
| 1677 | { |
| 1678 | struct nilfs_btree *btree; |
| 1679 | struct nilfs_btree_node *node; |
| 1680 | __u64 tmpptr; |
| 1681 | |
| 1682 | /* free resources */ |
| 1683 | if (bmap->b_ops->bop_clear != NULL) |
Pekka Enberg | 8acfbf0 | 2009-04-06 19:01:49 -0700 | [diff] [blame] | 1684 | bmap->b_ops->bop_clear(bmap); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1685 | |
| 1686 | /* ptr must be a pointer to a buffer head. */ |
| 1687 | set_buffer_nilfs_volatile((struct buffer_head *)((unsigned long)ptr)); |
| 1688 | |
| 1689 | /* convert and insert */ |
| 1690 | btree = (struct nilfs_btree *)bmap; |
Ryusuke Konishi | 3033342 | 2009-05-24 00:09:44 +0900 | [diff] [blame] | 1691 | nilfs_btree_init(bmap); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1692 | if (nreq != NULL) { |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1693 | nilfs_bmap_commit_alloc_ptr(bmap, dreq); |
| 1694 | nilfs_bmap_commit_alloc_ptr(bmap, nreq); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1695 | |
| 1696 | /* create child node at level 1 */ |
| 1697 | lock_buffer(bh); |
| 1698 | node = (struct nilfs_btree_node *)bh->b_data; |
| 1699 | nilfs_btree_node_init(btree, node, 0, 1, n, keys, ptrs); |
| 1700 | nilfs_btree_node_insert(btree, node, |
| 1701 | key, dreq->bpr_ptr, n); |
| 1702 | if (!buffer_dirty(bh)) |
| 1703 | nilfs_btnode_mark_dirty(bh); |
| 1704 | if (!nilfs_bmap_dirty(bmap)) |
| 1705 | nilfs_bmap_set_dirty(bmap); |
| 1706 | |
| 1707 | unlock_buffer(bh); |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1708 | brelse(bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1709 | |
| 1710 | /* create root node at level 2 */ |
| 1711 | node = nilfs_btree_get_root(btree); |
| 1712 | tmpptr = nreq->bpr_ptr; |
| 1713 | nilfs_btree_node_init(btree, node, NILFS_BTREE_NODE_ROOT, |
| 1714 | 2, 1, &keys[0], &tmpptr); |
| 1715 | } else { |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1716 | nilfs_bmap_commit_alloc_ptr(bmap, dreq); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1717 | |
| 1718 | /* create root node at level 1 */ |
| 1719 | node = nilfs_btree_get_root(btree); |
| 1720 | nilfs_btree_node_init(btree, node, NILFS_BTREE_NODE_ROOT, |
| 1721 | 1, n, keys, ptrs); |
| 1722 | nilfs_btree_node_insert(btree, node, |
| 1723 | key, dreq->bpr_ptr, n); |
| 1724 | if (!nilfs_bmap_dirty(bmap)) |
| 1725 | nilfs_bmap_set_dirty(bmap); |
| 1726 | } |
| 1727 | |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 1728 | if (NILFS_BMAP_USE_VBN(bmap)) |
| 1729 | nilfs_btree_set_target_v(btree, key, dreq->bpr_ptr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1730 | } |
| 1731 | |
| 1732 | /** |
| 1733 | * nilfs_btree_convert_and_insert - |
| 1734 | * @bmap: |
| 1735 | * @key: |
| 1736 | * @ptr: |
| 1737 | * @keys: |
| 1738 | * @ptrs: |
| 1739 | * @n: |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1740 | */ |
| 1741 | int nilfs_btree_convert_and_insert(struct nilfs_bmap *bmap, |
| 1742 | __u64 key, __u64 ptr, |
Ryusuke Konishi | 3033342 | 2009-05-24 00:09:44 +0900 | [diff] [blame] | 1743 | const __u64 *keys, const __u64 *ptrs, int n) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1744 | { |
| 1745 | struct buffer_head *bh; |
| 1746 | union nilfs_bmap_ptr_req dreq, nreq, *di, *ni; |
| 1747 | struct nilfs_bmap_stats stats; |
| 1748 | int ret; |
| 1749 | |
| 1750 | if (n + 1 <= NILFS_BTREE_ROOT_NCHILDREN_MAX) { |
| 1751 | di = &dreq; |
| 1752 | ni = NULL; |
| 1753 | } else if ((n + 1) <= NILFS_BTREE_NODE_NCHILDREN_MAX( |
| 1754 | 1 << bmap->b_inode->i_blkbits)) { |
| 1755 | di = &dreq; |
| 1756 | ni = &nreq; |
| 1757 | } else { |
| 1758 | di = NULL; |
| 1759 | ni = NULL; |
| 1760 | BUG(); |
| 1761 | } |
| 1762 | |
| 1763 | ret = nilfs_btree_prepare_convert_and_insert(bmap, key, di, ni, &bh, |
| 1764 | &stats); |
| 1765 | if (ret < 0) |
| 1766 | return ret; |
| 1767 | nilfs_btree_commit_convert_and_insert(bmap, key, ptr, keys, ptrs, n, |
Ryusuke Konishi | 3033342 | 2009-05-24 00:09:44 +0900 | [diff] [blame] | 1768 | di, ni, bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1769 | nilfs_bmap_add_blocks(bmap, stats.bs_nblocks); |
| 1770 | return 0; |
| 1771 | } |
| 1772 | |
| 1773 | static int nilfs_btree_propagate_p(struct nilfs_btree *btree, |
| 1774 | struct nilfs_btree_path *path, |
| 1775 | int level, |
| 1776 | struct buffer_head *bh) |
| 1777 | { |
| 1778 | while ((++level < nilfs_btree_height(btree) - 1) && |
| 1779 | !buffer_dirty(path[level].bp_bh)) |
| 1780 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 1781 | |
| 1782 | return 0; |
| 1783 | } |
| 1784 | |
| 1785 | static int nilfs_btree_prepare_update_v(struct nilfs_btree *btree, |
| 1786 | struct nilfs_btree_path *path, |
| 1787 | int level) |
| 1788 | { |
| 1789 | struct nilfs_btree_node *parent; |
| 1790 | int ret; |
| 1791 | |
| 1792 | parent = nilfs_btree_get_node(btree, path, level + 1); |
| 1793 | path[level].bp_oldreq.bpr_ptr = |
| 1794 | nilfs_btree_node_get_ptr(btree, parent, |
| 1795 | path[level + 1].bp_index); |
| 1796 | path[level].bp_newreq.bpr_ptr = path[level].bp_oldreq.bpr_ptr + 1; |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1797 | ret = nilfs_bmap_prepare_update_v(&btree->bt_bmap, |
| 1798 | &path[level].bp_oldreq, |
| 1799 | &path[level].bp_newreq); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1800 | if (ret < 0) |
| 1801 | return ret; |
| 1802 | |
| 1803 | if (buffer_nilfs_node(path[level].bp_bh)) { |
| 1804 | path[level].bp_ctxt.oldkey = path[level].bp_oldreq.bpr_ptr; |
| 1805 | path[level].bp_ctxt.newkey = path[level].bp_newreq.bpr_ptr; |
| 1806 | path[level].bp_ctxt.bh = path[level].bp_bh; |
| 1807 | ret = nilfs_btnode_prepare_change_key( |
| 1808 | &NILFS_BMAP_I(&btree->bt_bmap)->i_btnode_cache, |
| 1809 | &path[level].bp_ctxt); |
| 1810 | if (ret < 0) { |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1811 | nilfs_bmap_abort_update_v(&btree->bt_bmap, |
| 1812 | &path[level].bp_oldreq, |
| 1813 | &path[level].bp_newreq); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1814 | return ret; |
| 1815 | } |
| 1816 | } |
| 1817 | |
| 1818 | return 0; |
| 1819 | } |
| 1820 | |
| 1821 | static void nilfs_btree_commit_update_v(struct nilfs_btree *btree, |
| 1822 | struct nilfs_btree_path *path, |
| 1823 | int level) |
| 1824 | { |
| 1825 | struct nilfs_btree_node *parent; |
| 1826 | |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1827 | nilfs_bmap_commit_update_v(&btree->bt_bmap, |
| 1828 | &path[level].bp_oldreq, |
| 1829 | &path[level].bp_newreq); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1830 | |
| 1831 | if (buffer_nilfs_node(path[level].bp_bh)) { |
| 1832 | nilfs_btnode_commit_change_key( |
| 1833 | &NILFS_BMAP_I(&btree->bt_bmap)->i_btnode_cache, |
| 1834 | &path[level].bp_ctxt); |
| 1835 | path[level].bp_bh = path[level].bp_ctxt.bh; |
| 1836 | } |
| 1837 | set_buffer_nilfs_volatile(path[level].bp_bh); |
| 1838 | |
| 1839 | parent = nilfs_btree_get_node(btree, path, level + 1); |
| 1840 | nilfs_btree_node_set_ptr(btree, parent, path[level + 1].bp_index, |
| 1841 | path[level].bp_newreq.bpr_ptr); |
| 1842 | } |
| 1843 | |
| 1844 | static void nilfs_btree_abort_update_v(struct nilfs_btree *btree, |
| 1845 | struct nilfs_btree_path *path, |
| 1846 | int level) |
| 1847 | { |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1848 | nilfs_bmap_abort_update_v(&btree->bt_bmap, |
| 1849 | &path[level].bp_oldreq, |
| 1850 | &path[level].bp_newreq); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1851 | if (buffer_nilfs_node(path[level].bp_bh)) |
| 1852 | nilfs_btnode_abort_change_key( |
| 1853 | &NILFS_BMAP_I(&btree->bt_bmap)->i_btnode_cache, |
| 1854 | &path[level].bp_ctxt); |
| 1855 | } |
| 1856 | |
| 1857 | static int nilfs_btree_prepare_propagate_v(struct nilfs_btree *btree, |
| 1858 | struct nilfs_btree_path *path, |
| 1859 | int minlevel, |
| 1860 | int *maxlevelp) |
| 1861 | { |
| 1862 | int level, ret; |
| 1863 | |
| 1864 | level = minlevel; |
| 1865 | if (!buffer_nilfs_volatile(path[level].bp_bh)) { |
| 1866 | ret = nilfs_btree_prepare_update_v(btree, path, level); |
| 1867 | if (ret < 0) |
| 1868 | return ret; |
| 1869 | } |
| 1870 | while ((++level < nilfs_btree_height(btree) - 1) && |
| 1871 | !buffer_dirty(path[level].bp_bh)) { |
| 1872 | |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1873 | WARN_ON(buffer_nilfs_volatile(path[level].bp_bh)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1874 | ret = nilfs_btree_prepare_update_v(btree, path, level); |
| 1875 | if (ret < 0) |
| 1876 | goto out; |
| 1877 | } |
| 1878 | |
| 1879 | /* success */ |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1880 | *maxlevelp = level - 1; |
| 1881 | return 0; |
| 1882 | |
| 1883 | /* error */ |
| 1884 | out: |
| 1885 | while (--level > minlevel) |
| 1886 | nilfs_btree_abort_update_v(btree, path, level); |
| 1887 | if (!buffer_nilfs_volatile(path[level].bp_bh)) |
| 1888 | nilfs_btree_abort_update_v(btree, path, level); |
| 1889 | return ret; |
| 1890 | } |
| 1891 | |
| 1892 | static void nilfs_btree_commit_propagate_v(struct nilfs_btree *btree, |
| 1893 | struct nilfs_btree_path *path, |
| 1894 | int minlevel, |
| 1895 | int maxlevel, |
| 1896 | struct buffer_head *bh) |
| 1897 | { |
| 1898 | int level; |
| 1899 | |
| 1900 | if (!buffer_nilfs_volatile(path[minlevel].bp_bh)) |
| 1901 | nilfs_btree_commit_update_v(btree, path, minlevel); |
| 1902 | |
| 1903 | for (level = minlevel + 1; level <= maxlevel; level++) |
| 1904 | nilfs_btree_commit_update_v(btree, path, level); |
| 1905 | } |
| 1906 | |
| 1907 | static int nilfs_btree_propagate_v(struct nilfs_btree *btree, |
| 1908 | struct nilfs_btree_path *path, |
| 1909 | int level, |
| 1910 | struct buffer_head *bh) |
| 1911 | { |
| 1912 | int maxlevel, ret; |
| 1913 | struct nilfs_btree_node *parent; |
| 1914 | __u64 ptr; |
| 1915 | |
| 1916 | get_bh(bh); |
| 1917 | path[level].bp_bh = bh; |
| 1918 | ret = nilfs_btree_prepare_propagate_v(btree, path, level, &maxlevel); |
| 1919 | if (ret < 0) |
| 1920 | goto out; |
| 1921 | |
| 1922 | if (buffer_nilfs_volatile(path[level].bp_bh)) { |
| 1923 | parent = nilfs_btree_get_node(btree, path, level + 1); |
| 1924 | ptr = nilfs_btree_node_get_ptr(btree, parent, |
| 1925 | path[level + 1].bp_index); |
| 1926 | ret = nilfs_bmap_mark_dirty(&btree->bt_bmap, ptr); |
| 1927 | if (ret < 0) |
| 1928 | goto out; |
| 1929 | } |
| 1930 | |
| 1931 | nilfs_btree_commit_propagate_v(btree, path, level, maxlevel, bh); |
| 1932 | |
| 1933 | out: |
| 1934 | brelse(path[level].bp_bh); |
| 1935 | path[level].bp_bh = NULL; |
| 1936 | return ret; |
| 1937 | } |
| 1938 | |
| 1939 | static int nilfs_btree_propagate(const struct nilfs_bmap *bmap, |
| 1940 | struct buffer_head *bh) |
| 1941 | { |
| 1942 | struct nilfs_btree *btree; |
| 1943 | struct nilfs_btree_path *path; |
| 1944 | struct nilfs_btree_node *node; |
| 1945 | __u64 key; |
| 1946 | int level, ret; |
| 1947 | |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1948 | WARN_ON(!buffer_dirty(bh)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1949 | |
| 1950 | btree = (struct nilfs_btree *)bmap; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1951 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1952 | if (path == NULL) |
| 1953 | return -ENOMEM; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1954 | nilfs_btree_init_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1955 | |
| 1956 | if (buffer_nilfs_node(bh)) { |
| 1957 | node = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1958 | key = nilfs_btree_node_get_key(node, 0); |
| 1959 | level = nilfs_btree_node_get_level(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1960 | } else { |
| 1961 | key = nilfs_bmap_data_get_key(bmap, bh); |
| 1962 | level = NILFS_BTREE_LEVEL_DATA; |
| 1963 | } |
| 1964 | |
| 1965 | ret = nilfs_btree_do_lookup(btree, path, key, NULL, level + 1); |
| 1966 | if (ret < 0) { |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1967 | if (unlikely(ret == -ENOENT)) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1968 | printk(KERN_CRIT "%s: key = %llu, level == %d\n", |
| 1969 | __func__, (unsigned long long)key, level); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1970 | goto out; |
| 1971 | } |
| 1972 | |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 1973 | ret = NILFS_BMAP_USE_VBN(bmap) ? |
| 1974 | nilfs_btree_propagate_v(btree, path, level, bh) : |
| 1975 | nilfs_btree_propagate_p(btree, path, level, bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1976 | |
| 1977 | out: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 1978 | nilfs_btree_clear_path(path); |
| 1979 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1980 | |
| 1981 | return ret; |
| 1982 | } |
| 1983 | |
| 1984 | static int nilfs_btree_propagate_gc(const struct nilfs_bmap *bmap, |
| 1985 | struct buffer_head *bh) |
| 1986 | { |
| 1987 | return nilfs_bmap_mark_dirty(bmap, bh->b_blocknr); |
| 1988 | } |
| 1989 | |
| 1990 | static void nilfs_btree_add_dirty_buffer(struct nilfs_btree *btree, |
| 1991 | struct list_head *lists, |
| 1992 | struct buffer_head *bh) |
| 1993 | { |
| 1994 | struct list_head *head; |
| 1995 | struct buffer_head *cbh; |
| 1996 | struct nilfs_btree_node *node, *cnode; |
| 1997 | __u64 key, ckey; |
| 1998 | int level; |
| 1999 | |
| 2000 | get_bh(bh); |
| 2001 | node = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 2002 | key = nilfs_btree_node_get_key(node, 0); |
| 2003 | level = nilfs_btree_node_get_level(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2004 | list_for_each(head, &lists[level]) { |
| 2005 | cbh = list_entry(head, struct buffer_head, b_assoc_buffers); |
| 2006 | cnode = (struct nilfs_btree_node *)cbh->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 2007 | ckey = nilfs_btree_node_get_key(cnode, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2008 | if (key < ckey) |
| 2009 | break; |
| 2010 | } |
| 2011 | list_add_tail(&bh->b_assoc_buffers, head); |
| 2012 | } |
| 2013 | |
| 2014 | static void nilfs_btree_lookup_dirty_buffers(struct nilfs_bmap *bmap, |
| 2015 | struct list_head *listp) |
| 2016 | { |
| 2017 | struct nilfs_btree *btree = (struct nilfs_btree *)bmap; |
| 2018 | struct address_space *btcache = &NILFS_BMAP_I(bmap)->i_btnode_cache; |
| 2019 | struct list_head lists[NILFS_BTREE_LEVEL_MAX]; |
| 2020 | struct pagevec pvec; |
| 2021 | struct buffer_head *bh, *head; |
| 2022 | pgoff_t index = 0; |
| 2023 | int level, i; |
| 2024 | |
| 2025 | for (level = NILFS_BTREE_LEVEL_NODE_MIN; |
| 2026 | level < NILFS_BTREE_LEVEL_MAX; |
| 2027 | level++) |
| 2028 | INIT_LIST_HEAD(&lists[level]); |
| 2029 | |
| 2030 | pagevec_init(&pvec, 0); |
| 2031 | |
| 2032 | while (pagevec_lookup_tag(&pvec, btcache, &index, PAGECACHE_TAG_DIRTY, |
| 2033 | PAGEVEC_SIZE)) { |
| 2034 | for (i = 0; i < pagevec_count(&pvec); i++) { |
| 2035 | bh = head = page_buffers(pvec.pages[i]); |
| 2036 | do { |
| 2037 | if (buffer_dirty(bh)) |
| 2038 | nilfs_btree_add_dirty_buffer(btree, |
| 2039 | lists, bh); |
| 2040 | } while ((bh = bh->b_this_page) != head); |
| 2041 | } |
| 2042 | pagevec_release(&pvec); |
| 2043 | cond_resched(); |
| 2044 | } |
| 2045 | |
| 2046 | for (level = NILFS_BTREE_LEVEL_NODE_MIN; |
| 2047 | level < NILFS_BTREE_LEVEL_MAX; |
| 2048 | level++) |
| 2049 | list_splice(&lists[level], listp->prev); |
| 2050 | } |
| 2051 | |
| 2052 | static int nilfs_btree_assign_p(struct nilfs_btree *btree, |
| 2053 | struct nilfs_btree_path *path, |
| 2054 | int level, |
| 2055 | struct buffer_head **bh, |
| 2056 | sector_t blocknr, |
| 2057 | union nilfs_binfo *binfo) |
| 2058 | { |
| 2059 | struct nilfs_btree_node *parent; |
| 2060 | __u64 key; |
| 2061 | __u64 ptr; |
| 2062 | int ret; |
| 2063 | |
| 2064 | parent = nilfs_btree_get_node(btree, path, level + 1); |
| 2065 | ptr = nilfs_btree_node_get_ptr(btree, parent, |
| 2066 | path[level + 1].bp_index); |
| 2067 | if (buffer_nilfs_node(*bh)) { |
| 2068 | path[level].bp_ctxt.oldkey = ptr; |
| 2069 | path[level].bp_ctxt.newkey = blocknr; |
| 2070 | path[level].bp_ctxt.bh = *bh; |
| 2071 | ret = nilfs_btnode_prepare_change_key( |
| 2072 | &NILFS_BMAP_I(&btree->bt_bmap)->i_btnode_cache, |
| 2073 | &path[level].bp_ctxt); |
| 2074 | if (ret < 0) |
| 2075 | return ret; |
| 2076 | nilfs_btnode_commit_change_key( |
| 2077 | &NILFS_BMAP_I(&btree->bt_bmap)->i_btnode_cache, |
| 2078 | &path[level].bp_ctxt); |
| 2079 | *bh = path[level].bp_ctxt.bh; |
| 2080 | } |
| 2081 | |
| 2082 | nilfs_btree_node_set_ptr(btree, parent, |
| 2083 | path[level + 1].bp_index, blocknr); |
| 2084 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 2085 | key = nilfs_btree_node_get_key(parent, path[level + 1].bp_index); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2086 | /* on-disk format */ |
| 2087 | binfo->bi_dat.bi_blkoff = nilfs_bmap_key_to_dkey(key); |
| 2088 | binfo->bi_dat.bi_level = level; |
| 2089 | |
| 2090 | return 0; |
| 2091 | } |
| 2092 | |
| 2093 | static int nilfs_btree_assign_v(struct nilfs_btree *btree, |
| 2094 | struct nilfs_btree_path *path, |
| 2095 | int level, |
| 2096 | struct buffer_head **bh, |
| 2097 | sector_t blocknr, |
| 2098 | union nilfs_binfo *binfo) |
| 2099 | { |
| 2100 | struct nilfs_btree_node *parent; |
| 2101 | __u64 key; |
| 2102 | __u64 ptr; |
| 2103 | union nilfs_bmap_ptr_req req; |
| 2104 | int ret; |
| 2105 | |
| 2106 | parent = nilfs_btree_get_node(btree, path, level + 1); |
| 2107 | ptr = nilfs_btree_node_get_ptr(btree, parent, |
| 2108 | path[level + 1].bp_index); |
| 2109 | req.bpr_ptr = ptr; |
Ryusuke Konishi | d97a51a | 2009-05-03 21:43:01 +0900 | [diff] [blame] | 2110 | ret = nilfs_bmap_start_v(&btree->bt_bmap, &req, blocknr); |
| 2111 | if (unlikely(ret < 0)) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2112 | return ret; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2113 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 2114 | key = nilfs_btree_node_get_key(parent, path[level + 1].bp_index); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2115 | /* on-disk format */ |
| 2116 | binfo->bi_v.bi_vblocknr = nilfs_bmap_ptr_to_dptr(ptr); |
| 2117 | binfo->bi_v.bi_blkoff = nilfs_bmap_key_to_dkey(key); |
| 2118 | |
| 2119 | return 0; |
| 2120 | } |
| 2121 | |
| 2122 | static int nilfs_btree_assign(struct nilfs_bmap *bmap, |
| 2123 | struct buffer_head **bh, |
| 2124 | sector_t blocknr, |
| 2125 | union nilfs_binfo *binfo) |
| 2126 | { |
| 2127 | struct nilfs_btree *btree; |
| 2128 | struct nilfs_btree_path *path; |
| 2129 | struct nilfs_btree_node *node; |
| 2130 | __u64 key; |
| 2131 | int level, ret; |
| 2132 | |
| 2133 | btree = (struct nilfs_btree *)bmap; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 2134 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2135 | if (path == NULL) |
| 2136 | return -ENOMEM; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 2137 | nilfs_btree_init_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2138 | |
| 2139 | if (buffer_nilfs_node(*bh)) { |
| 2140 | node = (struct nilfs_btree_node *)(*bh)->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 2141 | key = nilfs_btree_node_get_key(node, 0); |
| 2142 | level = nilfs_btree_node_get_level(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2143 | } else { |
| 2144 | key = nilfs_bmap_data_get_key(bmap, *bh); |
| 2145 | level = NILFS_BTREE_LEVEL_DATA; |
| 2146 | } |
| 2147 | |
| 2148 | ret = nilfs_btree_do_lookup(btree, path, key, NULL, level + 1); |
| 2149 | if (ret < 0) { |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 2150 | WARN_ON(ret == -ENOENT); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2151 | goto out; |
| 2152 | } |
| 2153 | |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 2154 | ret = NILFS_BMAP_USE_VBN(bmap) ? |
| 2155 | nilfs_btree_assign_v(btree, path, level, bh, blocknr, binfo) : |
| 2156 | nilfs_btree_assign_p(btree, path, level, bh, blocknr, binfo); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2157 | |
| 2158 | out: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 2159 | nilfs_btree_clear_path(path); |
| 2160 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2161 | |
| 2162 | return ret; |
| 2163 | } |
| 2164 | |
| 2165 | static int nilfs_btree_assign_gc(struct nilfs_bmap *bmap, |
| 2166 | struct buffer_head **bh, |
| 2167 | sector_t blocknr, |
| 2168 | union nilfs_binfo *binfo) |
| 2169 | { |
| 2170 | struct nilfs_btree *btree; |
| 2171 | struct nilfs_btree_node *node; |
| 2172 | __u64 key; |
| 2173 | int ret; |
| 2174 | |
| 2175 | btree = (struct nilfs_btree *)bmap; |
| 2176 | ret = nilfs_bmap_move_v(bmap, (*bh)->b_blocknr, blocknr); |
| 2177 | if (ret < 0) |
| 2178 | return ret; |
| 2179 | |
| 2180 | if (buffer_nilfs_node(*bh)) { |
| 2181 | node = (struct nilfs_btree_node *)(*bh)->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 2182 | key = nilfs_btree_node_get_key(node, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2183 | } else |
| 2184 | key = nilfs_bmap_data_get_key(bmap, *bh); |
| 2185 | |
| 2186 | /* on-disk format */ |
| 2187 | binfo->bi_v.bi_vblocknr = cpu_to_le64((*bh)->b_blocknr); |
| 2188 | binfo->bi_v.bi_blkoff = nilfs_bmap_key_to_dkey(key); |
| 2189 | |
| 2190 | return 0; |
| 2191 | } |
| 2192 | |
| 2193 | static int nilfs_btree_mark(struct nilfs_bmap *bmap, __u64 key, int level) |
| 2194 | { |
| 2195 | struct buffer_head *bh; |
| 2196 | struct nilfs_btree *btree; |
| 2197 | struct nilfs_btree_path *path; |
| 2198 | __u64 ptr; |
| 2199 | int ret; |
| 2200 | |
| 2201 | btree = (struct nilfs_btree *)bmap; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 2202 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2203 | if (path == NULL) |
| 2204 | return -ENOMEM; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 2205 | nilfs_btree_init_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2206 | |
| 2207 | ret = nilfs_btree_do_lookup(btree, path, key, &ptr, level + 1); |
| 2208 | if (ret < 0) { |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 2209 | WARN_ON(ret == -ENOENT); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2210 | goto out; |
| 2211 | } |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 2212 | ret = nilfs_btree_get_block(btree, ptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2213 | if (ret < 0) { |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 2214 | WARN_ON(ret == -ENOENT); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2215 | goto out; |
| 2216 | } |
| 2217 | |
| 2218 | if (!buffer_dirty(bh)) |
| 2219 | nilfs_btnode_mark_dirty(bh); |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 2220 | brelse(bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2221 | if (!nilfs_bmap_dirty(&btree->bt_bmap)) |
| 2222 | nilfs_bmap_set_dirty(&btree->bt_bmap); |
| 2223 | |
| 2224 | out: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame^] | 2225 | nilfs_btree_clear_path(path); |
| 2226 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2227 | return ret; |
| 2228 | } |
| 2229 | |
| 2230 | static const struct nilfs_bmap_operations nilfs_btree_ops = { |
| 2231 | .bop_lookup = nilfs_btree_lookup, |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 2232 | .bop_lookup_contig = nilfs_btree_lookup_contig, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2233 | .bop_insert = nilfs_btree_insert, |
| 2234 | .bop_delete = nilfs_btree_delete, |
| 2235 | .bop_clear = NULL, |
| 2236 | |
| 2237 | .bop_propagate = nilfs_btree_propagate, |
| 2238 | |
| 2239 | .bop_lookup_dirty_buffers = nilfs_btree_lookup_dirty_buffers, |
| 2240 | |
| 2241 | .bop_assign = nilfs_btree_assign, |
| 2242 | .bop_mark = nilfs_btree_mark, |
| 2243 | |
| 2244 | .bop_last_key = nilfs_btree_last_key, |
| 2245 | .bop_check_insert = NULL, |
| 2246 | .bop_check_delete = nilfs_btree_check_delete, |
| 2247 | .bop_gather_data = nilfs_btree_gather_data, |
| 2248 | }; |
| 2249 | |
| 2250 | static const struct nilfs_bmap_operations nilfs_btree_ops_gc = { |
| 2251 | .bop_lookup = NULL, |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 2252 | .bop_lookup_contig = NULL, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2253 | .bop_insert = NULL, |
| 2254 | .bop_delete = NULL, |
| 2255 | .bop_clear = NULL, |
| 2256 | |
| 2257 | .bop_propagate = nilfs_btree_propagate_gc, |
| 2258 | |
| 2259 | .bop_lookup_dirty_buffers = nilfs_btree_lookup_dirty_buffers, |
| 2260 | |
| 2261 | .bop_assign = nilfs_btree_assign_gc, |
| 2262 | .bop_mark = NULL, |
| 2263 | |
| 2264 | .bop_last_key = NULL, |
| 2265 | .bop_check_insert = NULL, |
| 2266 | .bop_check_delete = NULL, |
| 2267 | .bop_gather_data = NULL, |
| 2268 | }; |
| 2269 | |
Ryusuke Konishi | 3033342 | 2009-05-24 00:09:44 +0900 | [diff] [blame] | 2270 | int nilfs_btree_init(struct nilfs_bmap *bmap) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2271 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2272 | bmap->b_ops = &nilfs_btree_ops; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2273 | return 0; |
| 2274 | } |
| 2275 | |
| 2276 | void nilfs_btree_init_gc(struct nilfs_bmap *bmap) |
| 2277 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2278 | bmap->b_ops = &nilfs_btree_ops_gc; |
| 2279 | } |