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 | 3218929 | 2009-08-15 01:54:59 +0900 | [diff] [blame] | 100 | static void nilfs_btree_release_path(struct nilfs_btree_path *path) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 101 | { |
| 102 | int level; |
| 103 | |
Ryusuke Konishi | 3218929 | 2009-08-15 01:54:59 +0900 | [diff] [blame] | 104 | for (level = NILFS_BTREE_LEVEL_DATA; level < NILFS_BTREE_LEVEL_MAX; |
| 105 | level++) |
| 106 | brelse(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 107 | } |
| 108 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 109 | /* |
| 110 | * B-tree node operations |
| 111 | */ |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 112 | static int nilfs_btree_get_block(const struct nilfs_btree *btree, __u64 ptr, |
| 113 | struct buffer_head **bhp) |
| 114 | { |
| 115 | struct address_space *btnc = |
| 116 | &NILFS_BMAP_I((struct nilfs_bmap *)btree)->i_btnode_cache; |
| 117 | return nilfs_btnode_get(btnc, ptr, 0, bhp, 0); |
| 118 | } |
| 119 | |
| 120 | static int nilfs_btree_get_new_block(const struct nilfs_btree *btree, |
| 121 | __u64 ptr, struct buffer_head **bhp) |
| 122 | { |
| 123 | struct address_space *btnc = |
| 124 | &NILFS_BMAP_I((struct nilfs_bmap *)btree)->i_btnode_cache; |
| 125 | int ret; |
| 126 | |
| 127 | ret = nilfs_btnode_get(btnc, ptr, 0, bhp, 1); |
| 128 | if (!ret) |
| 129 | set_buffer_nilfs_volatile(*bhp); |
| 130 | return ret; |
| 131 | } |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 132 | |
| 133 | static inline int |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 134 | nilfs_btree_node_get_flags(const struct nilfs_btree_node *node) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 135 | { |
| 136 | return node->bn_flags; |
| 137 | } |
| 138 | |
| 139 | static inline void |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 140 | nilfs_btree_node_set_flags(struct nilfs_btree_node *node, int flags) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 141 | { |
| 142 | node->bn_flags = flags; |
| 143 | } |
| 144 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 145 | 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] | 146 | { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 147 | return nilfs_btree_node_get_flags(node) & NILFS_BTREE_NODE_ROOT; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 148 | } |
| 149 | |
| 150 | static inline int |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 151 | nilfs_btree_node_get_level(const struct nilfs_btree_node *node) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 152 | { |
| 153 | return node->bn_level; |
| 154 | } |
| 155 | |
| 156 | static inline void |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 157 | nilfs_btree_node_set_level(struct nilfs_btree_node *node, int level) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 158 | { |
| 159 | node->bn_level = level; |
| 160 | } |
| 161 | |
| 162 | static inline int |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 163 | nilfs_btree_node_get_nchildren(const struct nilfs_btree_node *node) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 164 | { |
| 165 | return le16_to_cpu(node->bn_nchildren); |
| 166 | } |
| 167 | |
| 168 | static inline void |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 169 | nilfs_btree_node_set_nchildren(struct nilfs_btree_node *node, int nchildren) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 170 | { |
| 171 | node->bn_nchildren = cpu_to_le16(nchildren); |
| 172 | } |
| 173 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 174 | static inline int nilfs_btree_node_size(const struct nilfs_btree *btree) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 175 | { |
| 176 | return 1 << btree->bt_bmap.b_inode->i_blkbits; |
| 177 | } |
| 178 | |
| 179 | static inline int |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 180 | nilfs_btree_node_nchildren_min(const struct nilfs_btree_node *node, |
| 181 | const struct nilfs_btree *btree) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 182 | { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 183 | return nilfs_btree_node_root(node) ? |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 184 | NILFS_BTREE_ROOT_NCHILDREN_MIN : |
| 185 | NILFS_BTREE_NODE_NCHILDREN_MIN(nilfs_btree_node_size(btree)); |
| 186 | } |
| 187 | |
| 188 | static inline int |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 189 | nilfs_btree_node_nchildren_max(const struct nilfs_btree_node *node, |
| 190 | const struct nilfs_btree *btree) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 191 | { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 192 | return nilfs_btree_node_root(node) ? |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 193 | NILFS_BTREE_ROOT_NCHILDREN_MAX : |
| 194 | NILFS_BTREE_NODE_NCHILDREN_MAX(nilfs_btree_node_size(btree)); |
| 195 | } |
| 196 | |
| 197 | static inline __le64 * |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 198 | nilfs_btree_node_dkeys(const struct nilfs_btree_node *node) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 199 | { |
| 200 | return (__le64 *)((char *)(node + 1) + |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 201 | (nilfs_btree_node_root(node) ? |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 202 | 0 : NILFS_BTREE_NODE_EXTRA_PAD_SIZE)); |
| 203 | } |
| 204 | |
| 205 | static inline __le64 * |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 206 | nilfs_btree_node_dptrs(const struct nilfs_btree_node *node, |
| 207 | const struct nilfs_btree *btree) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 208 | { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 209 | return (__le64 *)(nilfs_btree_node_dkeys(node) + |
| 210 | nilfs_btree_node_nchildren_max(node, btree)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 211 | } |
| 212 | |
| 213 | static inline __u64 |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 214 | 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] | 215 | { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 216 | return nilfs_bmap_dkey_to_key(*(nilfs_btree_node_dkeys(node) + index)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 217 | } |
| 218 | |
| 219 | static inline void |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 220 | 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] | 221 | { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 222 | *(nilfs_btree_node_dkeys(node) + index) = nilfs_bmap_key_to_dkey(key); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 223 | } |
| 224 | |
| 225 | static inline __u64 |
| 226 | nilfs_btree_node_get_ptr(const struct nilfs_btree *btree, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 227 | const struct nilfs_btree_node *node, int index) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 228 | { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 229 | return nilfs_bmap_dptr_to_ptr(*(nilfs_btree_node_dptrs(node, btree) + |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 230 | index)); |
| 231 | } |
| 232 | |
| 233 | static inline void |
| 234 | nilfs_btree_node_set_ptr(struct nilfs_btree *btree, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 235 | struct nilfs_btree_node *node, int index, __u64 ptr) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 236 | { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 237 | *(nilfs_btree_node_dptrs(node, btree) + index) = |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 238 | nilfs_bmap_ptr_to_dptr(ptr); |
| 239 | } |
| 240 | |
| 241 | static void nilfs_btree_node_init(struct nilfs_btree *btree, |
| 242 | struct nilfs_btree_node *node, |
| 243 | int flags, int level, int nchildren, |
| 244 | const __u64 *keys, const __u64 *ptrs) |
| 245 | { |
| 246 | __le64 *dkeys; |
| 247 | __le64 *dptrs; |
| 248 | int i; |
| 249 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 250 | nilfs_btree_node_set_flags(node, flags); |
| 251 | nilfs_btree_node_set_level(node, level); |
| 252 | nilfs_btree_node_set_nchildren(node, nchildren); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 253 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 254 | dkeys = nilfs_btree_node_dkeys(node); |
| 255 | dptrs = nilfs_btree_node_dptrs(node, btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 256 | for (i = 0; i < nchildren; i++) { |
| 257 | dkeys[i] = nilfs_bmap_key_to_dkey(keys[i]); |
| 258 | dptrs[i] = nilfs_bmap_ptr_to_dptr(ptrs[i]); |
| 259 | } |
| 260 | } |
| 261 | |
| 262 | /* Assume the buffer heads corresponding to left and right are locked. */ |
| 263 | static void nilfs_btree_node_move_left(struct nilfs_btree *btree, |
| 264 | struct nilfs_btree_node *left, |
| 265 | struct nilfs_btree_node *right, |
| 266 | int n) |
| 267 | { |
| 268 | __le64 *ldkeys, *rdkeys; |
| 269 | __le64 *ldptrs, *rdptrs; |
| 270 | int lnchildren, rnchildren; |
| 271 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 272 | ldkeys = nilfs_btree_node_dkeys(left); |
| 273 | ldptrs = nilfs_btree_node_dptrs(left, btree); |
| 274 | lnchildren = nilfs_btree_node_get_nchildren(left); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 275 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 276 | rdkeys = nilfs_btree_node_dkeys(right); |
| 277 | rdptrs = nilfs_btree_node_dptrs(right, btree); |
| 278 | rnchildren = nilfs_btree_node_get_nchildren(right); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 279 | |
| 280 | memcpy(ldkeys + lnchildren, rdkeys, n * sizeof(*rdkeys)); |
| 281 | memcpy(ldptrs + lnchildren, rdptrs, n * sizeof(*rdptrs)); |
| 282 | memmove(rdkeys, rdkeys + n, (rnchildren - n) * sizeof(*rdkeys)); |
| 283 | memmove(rdptrs, rdptrs + n, (rnchildren - n) * sizeof(*rdptrs)); |
| 284 | |
| 285 | lnchildren += n; |
| 286 | rnchildren -= n; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 287 | nilfs_btree_node_set_nchildren(left, lnchildren); |
| 288 | nilfs_btree_node_set_nchildren(right, rnchildren); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 289 | } |
| 290 | |
| 291 | /* Assume that the buffer heads corresponding to left and right are locked. */ |
| 292 | static void nilfs_btree_node_move_right(struct nilfs_btree *btree, |
| 293 | struct nilfs_btree_node *left, |
| 294 | struct nilfs_btree_node *right, |
| 295 | int n) |
| 296 | { |
| 297 | __le64 *ldkeys, *rdkeys; |
| 298 | __le64 *ldptrs, *rdptrs; |
| 299 | int lnchildren, rnchildren; |
| 300 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 301 | ldkeys = nilfs_btree_node_dkeys(left); |
| 302 | ldptrs = nilfs_btree_node_dptrs(left, btree); |
| 303 | lnchildren = nilfs_btree_node_get_nchildren(left); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 304 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 305 | rdkeys = nilfs_btree_node_dkeys(right); |
| 306 | rdptrs = nilfs_btree_node_dptrs(right, btree); |
| 307 | rnchildren = nilfs_btree_node_get_nchildren(right); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 308 | |
| 309 | memmove(rdkeys + n, rdkeys, rnchildren * sizeof(*rdkeys)); |
| 310 | memmove(rdptrs + n, rdptrs, rnchildren * sizeof(*rdptrs)); |
| 311 | memcpy(rdkeys, ldkeys + lnchildren - n, n * sizeof(*rdkeys)); |
| 312 | memcpy(rdptrs, ldptrs + lnchildren - n, n * sizeof(*rdptrs)); |
| 313 | |
| 314 | lnchildren -= n; |
| 315 | rnchildren += n; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 316 | nilfs_btree_node_set_nchildren(left, lnchildren); |
| 317 | nilfs_btree_node_set_nchildren(right, rnchildren); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 318 | } |
| 319 | |
| 320 | /* Assume that the buffer head corresponding to node is locked. */ |
| 321 | static void nilfs_btree_node_insert(struct nilfs_btree *btree, |
| 322 | struct nilfs_btree_node *node, |
| 323 | __u64 key, __u64 ptr, int index) |
| 324 | { |
| 325 | __le64 *dkeys; |
| 326 | __le64 *dptrs; |
| 327 | int nchildren; |
| 328 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 329 | dkeys = nilfs_btree_node_dkeys(node); |
| 330 | dptrs = nilfs_btree_node_dptrs(node, btree); |
| 331 | nchildren = nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 332 | if (index < nchildren) { |
| 333 | memmove(dkeys + index + 1, dkeys + index, |
| 334 | (nchildren - index) * sizeof(*dkeys)); |
| 335 | memmove(dptrs + index + 1, dptrs + index, |
| 336 | (nchildren - index) * sizeof(*dptrs)); |
| 337 | } |
| 338 | dkeys[index] = nilfs_bmap_key_to_dkey(key); |
| 339 | dptrs[index] = nilfs_bmap_ptr_to_dptr(ptr); |
| 340 | nchildren++; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 341 | nilfs_btree_node_set_nchildren(node, nchildren); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 342 | } |
| 343 | |
| 344 | /* Assume that the buffer head corresponding to node is locked. */ |
| 345 | static void nilfs_btree_node_delete(struct nilfs_btree *btree, |
| 346 | struct nilfs_btree_node *node, |
| 347 | __u64 *keyp, __u64 *ptrp, int index) |
| 348 | { |
| 349 | __u64 key; |
| 350 | __u64 ptr; |
| 351 | __le64 *dkeys; |
| 352 | __le64 *dptrs; |
| 353 | int nchildren; |
| 354 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 355 | dkeys = nilfs_btree_node_dkeys(node); |
| 356 | dptrs = nilfs_btree_node_dptrs(node, btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 357 | key = nilfs_bmap_dkey_to_key(dkeys[index]); |
| 358 | ptr = nilfs_bmap_dptr_to_ptr(dptrs[index]); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 359 | nchildren = nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 360 | if (keyp != NULL) |
| 361 | *keyp = key; |
| 362 | if (ptrp != NULL) |
| 363 | *ptrp = ptr; |
| 364 | |
| 365 | if (index < nchildren - 1) { |
| 366 | memmove(dkeys + index, dkeys + index + 1, |
| 367 | (nchildren - index - 1) * sizeof(*dkeys)); |
| 368 | memmove(dptrs + index, dptrs + index + 1, |
| 369 | (nchildren - index - 1) * sizeof(*dptrs)); |
| 370 | } |
| 371 | nchildren--; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 372 | nilfs_btree_node_set_nchildren(node, nchildren); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 373 | } |
| 374 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 375 | static int nilfs_btree_node_lookup(const struct nilfs_btree_node *node, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 376 | __u64 key, int *indexp) |
| 377 | { |
| 378 | __u64 nkey; |
| 379 | int index, low, high, s; |
| 380 | |
| 381 | /* binary search */ |
| 382 | low = 0; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 383 | high = nilfs_btree_node_get_nchildren(node) - 1; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 384 | index = 0; |
| 385 | s = 0; |
| 386 | while (low <= high) { |
| 387 | index = (low + high) / 2; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 388 | nkey = nilfs_btree_node_get_key(node, index); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 389 | if (nkey == key) { |
| 390 | s = 0; |
| 391 | goto out; |
| 392 | } else if (nkey < key) { |
| 393 | low = index + 1; |
| 394 | s = -1; |
| 395 | } else { |
| 396 | high = index - 1; |
| 397 | s = 1; |
| 398 | } |
| 399 | } |
| 400 | |
| 401 | /* adjust index */ |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 402 | if (nilfs_btree_node_get_level(node) > NILFS_BTREE_LEVEL_NODE_MIN) { |
| 403 | if (s > 0 && index > 0) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 404 | index--; |
| 405 | } else if (s < 0) |
| 406 | index++; |
| 407 | |
| 408 | out: |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 409 | *indexp = index; |
| 410 | |
| 411 | return s == 0; |
| 412 | } |
| 413 | |
| 414 | static inline struct nilfs_btree_node * |
| 415 | nilfs_btree_get_root(const struct nilfs_btree *btree) |
| 416 | { |
| 417 | return (struct nilfs_btree_node *)btree->bt_bmap.b_u.u_data; |
| 418 | } |
| 419 | |
| 420 | static inline struct nilfs_btree_node * |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 421 | 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] | 422 | { |
| 423 | return (struct nilfs_btree_node *)path[level].bp_bh->b_data; |
| 424 | } |
| 425 | |
| 426 | static inline struct nilfs_btree_node * |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 427 | 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] | 428 | { |
| 429 | return (struct nilfs_btree_node *)path[level].bp_sib_bh->b_data; |
| 430 | } |
| 431 | |
| 432 | static inline int nilfs_btree_height(const struct nilfs_btree *btree) |
| 433 | { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 434 | return nilfs_btree_node_get_level(nilfs_btree_get_root(btree)) + 1; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 435 | } |
| 436 | |
| 437 | static inline struct nilfs_btree_node * |
| 438 | nilfs_btree_get_node(const struct nilfs_btree *btree, |
| 439 | const struct nilfs_btree_path *path, |
| 440 | int level) |
| 441 | { |
| 442 | return (level == nilfs_btree_height(btree) - 1) ? |
| 443 | nilfs_btree_get_root(btree) : |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 444 | nilfs_btree_get_nonroot_node(path, level); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 445 | } |
| 446 | |
Ryusuke Konishi | 9b945d5 | 2009-10-10 22:58:10 +0900 | [diff] [blame^] | 447 | static inline int |
| 448 | nilfs_btree_bad_node(struct nilfs_btree_node *node, int level) |
| 449 | { |
| 450 | if (unlikely(nilfs_btree_node_get_level(node) != level)) { |
| 451 | dump_stack(); |
| 452 | printk(KERN_CRIT "NILFS: btree level mismatch: %d != %d\n", |
| 453 | nilfs_btree_node_get_level(node), level); |
| 454 | return 1; |
| 455 | } |
| 456 | return 0; |
| 457 | } |
| 458 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 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); |
Ryusuke Konishi | 9b945d5 | 2009-10-10 22:58:10 +0900 | [diff] [blame^] | 482 | if (nilfs_btree_bad_node(node, level)) |
| 483 | return -EINVAL; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 484 | if (!found) |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 485 | found = nilfs_btree_node_lookup(node, key, &index); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 486 | else |
| 487 | index = 0; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 488 | if (index < nilfs_btree_node_nchildren_max(node, btree)) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 489 | ptr = nilfs_btree_node_get_ptr(btree, node, index); |
| 490 | else { |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 491 | WARN_ON(found || level != NILFS_BTREE_LEVEL_NODE_MIN); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 492 | /* insert */ |
| 493 | ptr = NILFS_BMAP_INVALID_PTR; |
| 494 | } |
| 495 | path[level].bp_index = index; |
| 496 | } |
| 497 | if (!found) |
| 498 | return -ENOENT; |
| 499 | |
| 500 | if (ptrp != NULL) |
| 501 | *ptrp = ptr; |
| 502 | |
| 503 | return 0; |
| 504 | } |
| 505 | |
| 506 | static int nilfs_btree_do_lookup_last(const struct nilfs_btree *btree, |
| 507 | struct nilfs_btree_path *path, |
| 508 | __u64 *keyp, __u64 *ptrp) |
| 509 | { |
| 510 | struct nilfs_btree_node *node; |
| 511 | __u64 ptr; |
| 512 | int index, level, ret; |
| 513 | |
| 514 | node = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 515 | index = nilfs_btree_node_get_nchildren(node) - 1; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 516 | if (index < 0) |
| 517 | return -ENOENT; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 518 | level = nilfs_btree_node_get_level(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 519 | ptr = nilfs_btree_node_get_ptr(btree, node, index); |
| 520 | path[level].bp_bh = NULL; |
| 521 | path[level].bp_index = index; |
| 522 | |
| 523 | for (level--; level > 0; level--) { |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 524 | ret = nilfs_btree_get_block(btree, ptr, &path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 525 | if (ret < 0) |
| 526 | return ret; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 527 | node = nilfs_btree_get_nonroot_node(path, level); |
Ryusuke Konishi | 9b945d5 | 2009-10-10 22:58:10 +0900 | [diff] [blame^] | 528 | if (nilfs_btree_bad_node(node, level)) |
| 529 | return -EINVAL; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 530 | index = nilfs_btree_node_get_nchildren(node) - 1; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 531 | ptr = nilfs_btree_node_get_ptr(btree, node, index); |
| 532 | path[level].bp_index = index; |
| 533 | } |
| 534 | |
| 535 | if (keyp != NULL) |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 536 | *keyp = nilfs_btree_node_get_key(node, index); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 537 | if (ptrp != NULL) |
| 538 | *ptrp = ptr; |
| 539 | |
| 540 | return 0; |
| 541 | } |
| 542 | |
| 543 | static int nilfs_btree_lookup(const struct nilfs_bmap *bmap, |
| 544 | __u64 key, int level, __u64 *ptrp) |
| 545 | { |
| 546 | struct nilfs_btree *btree; |
| 547 | struct nilfs_btree_path *path; |
| 548 | __u64 ptr; |
| 549 | int ret; |
| 550 | |
| 551 | btree = (struct nilfs_btree *)bmap; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 552 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 553 | if (path == NULL) |
| 554 | return -ENOMEM; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 555 | nilfs_btree_init_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 556 | |
| 557 | ret = nilfs_btree_do_lookup(btree, path, key, &ptr, level); |
| 558 | |
| 559 | if (ptrp != NULL) |
| 560 | *ptrp = ptr; |
| 561 | |
Ryusuke Konishi | 3218929 | 2009-08-15 01:54:59 +0900 | [diff] [blame] | 562 | nilfs_btree_release_path(path); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 563 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 564 | |
| 565 | return ret; |
| 566 | } |
| 567 | |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 568 | static int nilfs_btree_lookup_contig(const struct nilfs_bmap *bmap, |
| 569 | __u64 key, __u64 *ptrp, unsigned maxblocks) |
| 570 | { |
| 571 | struct nilfs_btree *btree = (struct nilfs_btree *)bmap; |
| 572 | struct nilfs_btree_path *path; |
| 573 | struct nilfs_btree_node *node; |
| 574 | struct inode *dat = NULL; |
| 575 | __u64 ptr, ptr2; |
| 576 | sector_t blocknr; |
| 577 | int level = NILFS_BTREE_LEVEL_NODE_MIN; |
| 578 | int ret, cnt, index, maxlevel; |
| 579 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 580 | path = nilfs_btree_alloc_path(); |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 581 | if (path == NULL) |
| 582 | return -ENOMEM; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 583 | nilfs_btree_init_path(path); |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 584 | ret = nilfs_btree_do_lookup(btree, path, key, &ptr, level); |
| 585 | if (ret < 0) |
| 586 | goto out; |
| 587 | |
| 588 | if (NILFS_BMAP_USE_VBN(bmap)) { |
| 589 | dat = nilfs_bmap_get_dat(bmap); |
| 590 | ret = nilfs_dat_translate(dat, ptr, &blocknr); |
| 591 | if (ret < 0) |
| 592 | goto out; |
| 593 | ptr = blocknr; |
| 594 | } |
| 595 | cnt = 1; |
| 596 | if (cnt == maxblocks) |
| 597 | goto end; |
| 598 | |
| 599 | maxlevel = nilfs_btree_height(btree) - 1; |
| 600 | node = nilfs_btree_get_node(btree, path, level); |
| 601 | index = path[level].bp_index + 1; |
| 602 | for (;;) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 603 | while (index < nilfs_btree_node_get_nchildren(node)) { |
| 604 | if (nilfs_btree_node_get_key(node, index) != |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 605 | key + cnt) |
| 606 | goto end; |
| 607 | ptr2 = nilfs_btree_node_get_ptr(btree, node, index); |
| 608 | if (dat) { |
| 609 | ret = nilfs_dat_translate(dat, ptr2, &blocknr); |
| 610 | if (ret < 0) |
| 611 | goto out; |
| 612 | ptr2 = blocknr; |
| 613 | } |
| 614 | if (ptr2 != ptr + cnt || ++cnt == maxblocks) |
| 615 | goto end; |
| 616 | index++; |
| 617 | continue; |
| 618 | } |
| 619 | if (level == maxlevel) |
| 620 | break; |
| 621 | |
| 622 | /* look-up right sibling node */ |
| 623 | node = nilfs_btree_get_node(btree, path, level + 1); |
| 624 | index = path[level + 1].bp_index + 1; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 625 | if (index >= nilfs_btree_node_get_nchildren(node) || |
| 626 | nilfs_btree_node_get_key(node, index) != key + cnt) |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 627 | break; |
| 628 | ptr2 = nilfs_btree_node_get_ptr(btree, node, index); |
| 629 | path[level + 1].bp_index = index; |
| 630 | |
| 631 | brelse(path[level].bp_bh); |
| 632 | path[level].bp_bh = NULL; |
| 633 | ret = nilfs_btree_get_block(btree, ptr2, &path[level].bp_bh); |
| 634 | if (ret < 0) |
| 635 | goto out; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 636 | node = nilfs_btree_get_nonroot_node(path, level); |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 637 | index = 0; |
| 638 | path[level].bp_index = index; |
| 639 | } |
| 640 | end: |
| 641 | *ptrp = ptr; |
| 642 | ret = cnt; |
| 643 | out: |
Ryusuke Konishi | 3218929 | 2009-08-15 01:54:59 +0900 | [diff] [blame] | 644 | nilfs_btree_release_path(path); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 645 | nilfs_btree_free_path(path); |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 646 | return ret; |
| 647 | } |
| 648 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 649 | static void nilfs_btree_promote_key(struct nilfs_btree *btree, |
| 650 | struct nilfs_btree_path *path, |
| 651 | int level, __u64 key) |
| 652 | { |
| 653 | if (level < nilfs_btree_height(btree) - 1) { |
| 654 | do { |
| 655 | lock_buffer(path[level].bp_bh); |
| 656 | nilfs_btree_node_set_key( |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 657 | nilfs_btree_get_nonroot_node(path, level), |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 658 | path[level].bp_index, key); |
| 659 | if (!buffer_dirty(path[level].bp_bh)) |
| 660 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 661 | unlock_buffer(path[level].bp_bh); |
| 662 | } while ((path[level].bp_index == 0) && |
| 663 | (++level < nilfs_btree_height(btree) - 1)); |
| 664 | } |
| 665 | |
| 666 | /* root */ |
| 667 | if (level == nilfs_btree_height(btree) - 1) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 668 | nilfs_btree_node_set_key(nilfs_btree_get_root(btree), |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 669 | path[level].bp_index, key); |
| 670 | } |
| 671 | } |
| 672 | |
| 673 | static void nilfs_btree_do_insert(struct nilfs_btree *btree, |
| 674 | struct nilfs_btree_path *path, |
| 675 | int level, __u64 *keyp, __u64 *ptrp) |
| 676 | { |
| 677 | struct nilfs_btree_node *node; |
| 678 | |
| 679 | if (level < nilfs_btree_height(btree) - 1) { |
| 680 | lock_buffer(path[level].bp_bh); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 681 | node = nilfs_btree_get_nonroot_node(path, level); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 682 | nilfs_btree_node_insert(btree, node, *keyp, *ptrp, |
| 683 | path[level].bp_index); |
| 684 | if (!buffer_dirty(path[level].bp_bh)) |
| 685 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 686 | unlock_buffer(path[level].bp_bh); |
| 687 | |
| 688 | if (path[level].bp_index == 0) |
| 689 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 690 | nilfs_btree_node_get_key(node, |
| 691 | 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 692 | } else { |
| 693 | node = nilfs_btree_get_root(btree); |
| 694 | nilfs_btree_node_insert(btree, node, *keyp, *ptrp, |
| 695 | path[level].bp_index); |
| 696 | } |
| 697 | } |
| 698 | |
| 699 | static void nilfs_btree_carry_left(struct nilfs_btree *btree, |
| 700 | struct nilfs_btree_path *path, |
| 701 | int level, __u64 *keyp, __u64 *ptrp) |
| 702 | { |
| 703 | struct nilfs_btree_node *node, *left; |
| 704 | int nchildren, lnchildren, n, move; |
| 705 | |
| 706 | lock_buffer(path[level].bp_bh); |
| 707 | lock_buffer(path[level].bp_sib_bh); |
| 708 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 709 | node = nilfs_btree_get_nonroot_node(path, level); |
| 710 | left = nilfs_btree_get_sib_node(path, level); |
| 711 | nchildren = nilfs_btree_node_get_nchildren(node); |
| 712 | lnchildren = nilfs_btree_node_get_nchildren(left); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 713 | move = 0; |
| 714 | |
| 715 | n = (nchildren + lnchildren + 1) / 2 - lnchildren; |
| 716 | if (n > path[level].bp_index) { |
| 717 | /* move insert point */ |
| 718 | n--; |
| 719 | move = 1; |
| 720 | } |
| 721 | |
| 722 | nilfs_btree_node_move_left(btree, left, node, n); |
| 723 | |
| 724 | if (!buffer_dirty(path[level].bp_bh)) |
| 725 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 726 | if (!buffer_dirty(path[level].bp_sib_bh)) |
| 727 | nilfs_btnode_mark_dirty(path[level].bp_sib_bh); |
| 728 | |
| 729 | unlock_buffer(path[level].bp_bh); |
| 730 | unlock_buffer(path[level].bp_sib_bh); |
| 731 | |
| 732 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 733 | nilfs_btree_node_get_key(node, 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 734 | |
| 735 | if (move) { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 736 | brelse(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 737 | path[level].bp_bh = path[level].bp_sib_bh; |
| 738 | path[level].bp_sib_bh = NULL; |
| 739 | path[level].bp_index += lnchildren; |
| 740 | path[level + 1].bp_index--; |
| 741 | } else { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 742 | brelse(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 743 | path[level].bp_sib_bh = NULL; |
| 744 | path[level].bp_index -= n; |
| 745 | } |
| 746 | |
| 747 | nilfs_btree_do_insert(btree, path, level, keyp, ptrp); |
| 748 | } |
| 749 | |
| 750 | static void nilfs_btree_carry_right(struct nilfs_btree *btree, |
| 751 | struct nilfs_btree_path *path, |
| 752 | int level, __u64 *keyp, __u64 *ptrp) |
| 753 | { |
| 754 | struct nilfs_btree_node *node, *right; |
| 755 | int nchildren, rnchildren, n, move; |
| 756 | |
| 757 | lock_buffer(path[level].bp_bh); |
| 758 | lock_buffer(path[level].bp_sib_bh); |
| 759 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 760 | node = nilfs_btree_get_nonroot_node(path, level); |
| 761 | right = nilfs_btree_get_sib_node(path, level); |
| 762 | nchildren = nilfs_btree_node_get_nchildren(node); |
| 763 | rnchildren = nilfs_btree_node_get_nchildren(right); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 764 | move = 0; |
| 765 | |
| 766 | n = (nchildren + rnchildren + 1) / 2 - rnchildren; |
| 767 | if (n > nchildren - path[level].bp_index) { |
| 768 | /* move insert point */ |
| 769 | n--; |
| 770 | move = 1; |
| 771 | } |
| 772 | |
| 773 | nilfs_btree_node_move_right(btree, node, right, n); |
| 774 | |
| 775 | if (!buffer_dirty(path[level].bp_bh)) |
| 776 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 777 | if (!buffer_dirty(path[level].bp_sib_bh)) |
| 778 | nilfs_btnode_mark_dirty(path[level].bp_sib_bh); |
| 779 | |
| 780 | unlock_buffer(path[level].bp_bh); |
| 781 | unlock_buffer(path[level].bp_sib_bh); |
| 782 | |
| 783 | path[level + 1].bp_index++; |
| 784 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 785 | nilfs_btree_node_get_key(right, 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 786 | path[level + 1].bp_index--; |
| 787 | |
| 788 | if (move) { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 789 | brelse(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 790 | path[level].bp_bh = path[level].bp_sib_bh; |
| 791 | path[level].bp_sib_bh = NULL; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 792 | path[level].bp_index -= nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 793 | path[level + 1].bp_index++; |
| 794 | } else { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 795 | brelse(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 796 | path[level].bp_sib_bh = NULL; |
| 797 | } |
| 798 | |
| 799 | nilfs_btree_do_insert(btree, path, level, keyp, ptrp); |
| 800 | } |
| 801 | |
| 802 | static void nilfs_btree_split(struct nilfs_btree *btree, |
| 803 | struct nilfs_btree_path *path, |
| 804 | int level, __u64 *keyp, __u64 *ptrp) |
| 805 | { |
| 806 | struct nilfs_btree_node *node, *right; |
| 807 | __u64 newkey; |
| 808 | __u64 newptr; |
| 809 | int nchildren, n, move; |
| 810 | |
| 811 | lock_buffer(path[level].bp_bh); |
| 812 | lock_buffer(path[level].bp_sib_bh); |
| 813 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 814 | node = nilfs_btree_get_nonroot_node(path, level); |
| 815 | right = nilfs_btree_get_sib_node(path, level); |
| 816 | nchildren = nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 817 | move = 0; |
| 818 | |
| 819 | n = (nchildren + 1) / 2; |
| 820 | if (n > nchildren - path[level].bp_index) { |
| 821 | n--; |
| 822 | move = 1; |
| 823 | } |
| 824 | |
| 825 | nilfs_btree_node_move_right(btree, node, right, n); |
| 826 | |
| 827 | if (!buffer_dirty(path[level].bp_bh)) |
| 828 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 829 | if (!buffer_dirty(path[level].bp_sib_bh)) |
| 830 | nilfs_btnode_mark_dirty(path[level].bp_sib_bh); |
| 831 | |
| 832 | unlock_buffer(path[level].bp_bh); |
| 833 | unlock_buffer(path[level].bp_sib_bh); |
| 834 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 835 | newkey = nilfs_btree_node_get_key(right, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 836 | newptr = path[level].bp_newreq.bpr_ptr; |
| 837 | |
| 838 | if (move) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 839 | path[level].bp_index -= nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 840 | nilfs_btree_node_insert(btree, right, *keyp, *ptrp, |
| 841 | path[level].bp_index); |
| 842 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 843 | *keyp = nilfs_btree_node_get_key(right, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 844 | *ptrp = path[level].bp_newreq.bpr_ptr; |
| 845 | |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 846 | brelse(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 847 | path[level].bp_bh = path[level].bp_sib_bh; |
| 848 | path[level].bp_sib_bh = NULL; |
| 849 | } else { |
| 850 | nilfs_btree_do_insert(btree, path, level, keyp, ptrp); |
| 851 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 852 | *keyp = nilfs_btree_node_get_key(right, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 853 | *ptrp = path[level].bp_newreq.bpr_ptr; |
| 854 | |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 855 | brelse(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 856 | path[level].bp_sib_bh = NULL; |
| 857 | } |
| 858 | |
| 859 | path[level + 1].bp_index++; |
| 860 | } |
| 861 | |
| 862 | static void nilfs_btree_grow(struct nilfs_btree *btree, |
| 863 | struct nilfs_btree_path *path, |
| 864 | int level, __u64 *keyp, __u64 *ptrp) |
| 865 | { |
| 866 | struct nilfs_btree_node *root, *child; |
| 867 | int n; |
| 868 | |
| 869 | lock_buffer(path[level].bp_sib_bh); |
| 870 | |
| 871 | root = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 872 | child = nilfs_btree_get_sib_node(path, level); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 873 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 874 | n = nilfs_btree_node_get_nchildren(root); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 875 | |
| 876 | nilfs_btree_node_move_right(btree, root, child, n); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 877 | nilfs_btree_node_set_level(root, level + 1); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 878 | |
| 879 | if (!buffer_dirty(path[level].bp_sib_bh)) |
| 880 | nilfs_btnode_mark_dirty(path[level].bp_sib_bh); |
| 881 | |
| 882 | unlock_buffer(path[level].bp_sib_bh); |
| 883 | |
| 884 | path[level].bp_bh = path[level].bp_sib_bh; |
| 885 | path[level].bp_sib_bh = NULL; |
| 886 | |
| 887 | nilfs_btree_do_insert(btree, path, level, keyp, ptrp); |
| 888 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 889 | *keyp = nilfs_btree_node_get_key(child, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 890 | *ptrp = path[level].bp_newreq.bpr_ptr; |
| 891 | } |
| 892 | |
| 893 | static __u64 nilfs_btree_find_near(const struct nilfs_btree *btree, |
| 894 | const struct nilfs_btree_path *path) |
| 895 | { |
| 896 | struct nilfs_btree_node *node; |
| 897 | int level; |
| 898 | |
| 899 | if (path == NULL) |
| 900 | return NILFS_BMAP_INVALID_PTR; |
| 901 | |
| 902 | /* left sibling */ |
| 903 | level = NILFS_BTREE_LEVEL_NODE_MIN; |
| 904 | if (path[level].bp_index > 0) { |
| 905 | node = nilfs_btree_get_node(btree, path, level); |
| 906 | return nilfs_btree_node_get_ptr(btree, node, |
| 907 | path[level].bp_index - 1); |
| 908 | } |
| 909 | |
| 910 | /* parent */ |
| 911 | level = NILFS_BTREE_LEVEL_NODE_MIN + 1; |
| 912 | if (level <= nilfs_btree_height(btree) - 1) { |
| 913 | node = nilfs_btree_get_node(btree, path, level); |
| 914 | return nilfs_btree_node_get_ptr(btree, node, |
| 915 | path[level].bp_index); |
| 916 | } |
| 917 | |
| 918 | return NILFS_BMAP_INVALID_PTR; |
| 919 | } |
| 920 | |
| 921 | static __u64 nilfs_btree_find_target_v(const struct nilfs_btree *btree, |
| 922 | const struct nilfs_btree_path *path, |
| 923 | __u64 key) |
| 924 | { |
| 925 | __u64 ptr; |
| 926 | |
| 927 | ptr = nilfs_bmap_find_target_seq(&btree->bt_bmap, key); |
| 928 | if (ptr != NILFS_BMAP_INVALID_PTR) |
| 929 | /* sequential access */ |
| 930 | return ptr; |
| 931 | else { |
| 932 | ptr = nilfs_btree_find_near(btree, path); |
| 933 | if (ptr != NILFS_BMAP_INVALID_PTR) |
| 934 | /* near */ |
| 935 | return ptr; |
| 936 | } |
| 937 | /* block group */ |
| 938 | return nilfs_bmap_find_target_in_group(&btree->bt_bmap); |
| 939 | } |
| 940 | |
| 941 | static void nilfs_btree_set_target_v(struct nilfs_btree *btree, __u64 key, |
| 942 | __u64 ptr) |
| 943 | { |
| 944 | btree->bt_bmap.b_last_allocated_key = key; |
| 945 | btree->bt_bmap.b_last_allocated_ptr = ptr; |
| 946 | } |
| 947 | |
| 948 | static int nilfs_btree_prepare_insert(struct nilfs_btree *btree, |
| 949 | struct nilfs_btree_path *path, |
| 950 | int *levelp, __u64 key, __u64 ptr, |
| 951 | struct nilfs_bmap_stats *stats) |
| 952 | { |
| 953 | struct buffer_head *bh; |
| 954 | struct nilfs_btree_node *node, *parent, *sib; |
| 955 | __u64 sibptr; |
| 956 | int pindex, level, ret; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 957 | struct inode *dat = NULL; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 958 | |
| 959 | stats->bs_nblocks = 0; |
| 960 | level = NILFS_BTREE_LEVEL_DATA; |
| 961 | |
| 962 | /* allocate a new ptr for data block */ |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 963 | if (NILFS_BMAP_USE_VBN(&btree->bt_bmap)) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 964 | path[level].bp_newreq.bpr_ptr = |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 965 | nilfs_btree_find_target_v(btree, path, key); |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 966 | dat = nilfs_bmap_get_dat(&btree->bt_bmap); |
| 967 | } |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 968 | |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 969 | ret = nilfs_bmap_prepare_alloc_ptr(&btree->bt_bmap, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 970 | &path[level].bp_newreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 971 | if (ret < 0) |
| 972 | goto err_out_data; |
| 973 | |
| 974 | for (level = NILFS_BTREE_LEVEL_NODE_MIN; |
| 975 | level < nilfs_btree_height(btree) - 1; |
| 976 | level++) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 977 | node = nilfs_btree_get_nonroot_node(path, level); |
| 978 | if (nilfs_btree_node_get_nchildren(node) < |
| 979 | nilfs_btree_node_nchildren_max(node, btree)) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 980 | path[level].bp_op = nilfs_btree_do_insert; |
| 981 | stats->bs_nblocks++; |
| 982 | goto out; |
| 983 | } |
| 984 | |
| 985 | parent = nilfs_btree_get_node(btree, path, level + 1); |
| 986 | pindex = path[level + 1].bp_index; |
| 987 | |
| 988 | /* left sibling */ |
| 989 | if (pindex > 0) { |
| 990 | sibptr = nilfs_btree_node_get_ptr(btree, parent, |
| 991 | pindex - 1); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 992 | ret = nilfs_btree_get_block(btree, sibptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 993 | if (ret < 0) |
| 994 | goto err_out_child_node; |
| 995 | sib = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 996 | if (nilfs_btree_node_get_nchildren(sib) < |
| 997 | nilfs_btree_node_nchildren_max(sib, btree)) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 998 | path[level].bp_sib_bh = bh; |
| 999 | path[level].bp_op = nilfs_btree_carry_left; |
| 1000 | stats->bs_nblocks++; |
| 1001 | goto out; |
| 1002 | } else |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1003 | brelse(bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1004 | } |
| 1005 | |
| 1006 | /* right sibling */ |
| 1007 | if (pindex < |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1008 | nilfs_btree_node_get_nchildren(parent) - 1) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1009 | sibptr = nilfs_btree_node_get_ptr(btree, parent, |
| 1010 | pindex + 1); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1011 | ret = nilfs_btree_get_block(btree, sibptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1012 | if (ret < 0) |
| 1013 | goto err_out_child_node; |
| 1014 | sib = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1015 | if (nilfs_btree_node_get_nchildren(sib) < |
| 1016 | nilfs_btree_node_nchildren_max(sib, btree)) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1017 | path[level].bp_sib_bh = bh; |
| 1018 | path[level].bp_op = nilfs_btree_carry_right; |
| 1019 | stats->bs_nblocks++; |
| 1020 | goto out; |
| 1021 | } else |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1022 | brelse(bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1023 | } |
| 1024 | |
| 1025 | /* split */ |
| 1026 | path[level].bp_newreq.bpr_ptr = |
| 1027 | path[level - 1].bp_newreq.bpr_ptr + 1; |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1028 | ret = nilfs_bmap_prepare_alloc_ptr(&btree->bt_bmap, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1029 | &path[level].bp_newreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1030 | if (ret < 0) |
| 1031 | goto err_out_child_node; |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1032 | ret = nilfs_btree_get_new_block(btree, |
| 1033 | path[level].bp_newreq.bpr_ptr, |
| 1034 | &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1035 | if (ret < 0) |
| 1036 | goto err_out_curr_node; |
| 1037 | |
| 1038 | stats->bs_nblocks++; |
| 1039 | |
| 1040 | lock_buffer(bh); |
| 1041 | nilfs_btree_node_init(btree, |
| 1042 | (struct nilfs_btree_node *)bh->b_data, |
| 1043 | 0, level, 0, NULL, NULL); |
| 1044 | unlock_buffer(bh); |
| 1045 | path[level].bp_sib_bh = bh; |
| 1046 | path[level].bp_op = nilfs_btree_split; |
| 1047 | } |
| 1048 | |
| 1049 | /* root */ |
| 1050 | node = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1051 | if (nilfs_btree_node_get_nchildren(node) < |
| 1052 | nilfs_btree_node_nchildren_max(node, btree)) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1053 | path[level].bp_op = nilfs_btree_do_insert; |
| 1054 | stats->bs_nblocks++; |
| 1055 | goto out; |
| 1056 | } |
| 1057 | |
| 1058 | /* grow */ |
| 1059 | 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] | 1060 | ret = nilfs_bmap_prepare_alloc_ptr(&btree->bt_bmap, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1061 | &path[level].bp_newreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1062 | if (ret < 0) |
| 1063 | goto err_out_child_node; |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1064 | ret = nilfs_btree_get_new_block(btree, path[level].bp_newreq.bpr_ptr, |
| 1065 | &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1066 | if (ret < 0) |
| 1067 | goto err_out_curr_node; |
| 1068 | |
| 1069 | lock_buffer(bh); |
| 1070 | nilfs_btree_node_init(btree, (struct nilfs_btree_node *)bh->b_data, |
| 1071 | 0, level, 0, NULL, NULL); |
| 1072 | unlock_buffer(bh); |
| 1073 | path[level].bp_sib_bh = bh; |
| 1074 | path[level].bp_op = nilfs_btree_grow; |
| 1075 | |
| 1076 | level++; |
| 1077 | path[level].bp_op = nilfs_btree_do_insert; |
| 1078 | |
| 1079 | /* a newly-created node block and a data block are added */ |
| 1080 | stats->bs_nblocks += 2; |
| 1081 | |
| 1082 | /* success */ |
| 1083 | out: |
| 1084 | *levelp = level; |
| 1085 | return ret; |
| 1086 | |
| 1087 | /* error */ |
| 1088 | err_out_curr_node: |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1089 | nilfs_bmap_abort_alloc_ptr(&btree->bt_bmap, &path[level].bp_newreq, |
| 1090 | dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1091 | err_out_child_node: |
| 1092 | for (level--; level > NILFS_BTREE_LEVEL_DATA; level--) { |
Ryusuke Konishi | 9f09890 | 2009-05-22 00:38:56 +0900 | [diff] [blame] | 1093 | nilfs_btnode_delete(path[level].bp_sib_bh); |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1094 | nilfs_bmap_abort_alloc_ptr(&btree->bt_bmap, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1095 | &path[level].bp_newreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1096 | |
| 1097 | } |
| 1098 | |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1099 | nilfs_bmap_abort_alloc_ptr(&btree->bt_bmap, &path[level].bp_newreq, |
| 1100 | dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1101 | err_out_data: |
| 1102 | *levelp = level; |
| 1103 | stats->bs_nblocks = 0; |
| 1104 | return ret; |
| 1105 | } |
| 1106 | |
| 1107 | static void nilfs_btree_commit_insert(struct nilfs_btree *btree, |
| 1108 | struct nilfs_btree_path *path, |
| 1109 | int maxlevel, __u64 key, __u64 ptr) |
| 1110 | { |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1111 | struct inode *dat = NULL; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1112 | int level; |
| 1113 | |
| 1114 | set_buffer_nilfs_volatile((struct buffer_head *)((unsigned long)ptr)); |
| 1115 | ptr = path[NILFS_BTREE_LEVEL_DATA].bp_newreq.bpr_ptr; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1116 | if (NILFS_BMAP_USE_VBN(&btree->bt_bmap)) { |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 1117 | nilfs_btree_set_target_v(btree, key, ptr); |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1118 | dat = nilfs_bmap_get_dat(&btree->bt_bmap); |
| 1119 | } |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1120 | |
| 1121 | for (level = NILFS_BTREE_LEVEL_NODE_MIN; level <= maxlevel; level++) { |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1122 | nilfs_bmap_commit_alloc_ptr(&btree->bt_bmap, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1123 | &path[level - 1].bp_newreq, dat); |
Pekka Enberg | 8acfbf0 | 2009-04-06 19:01:49 -0700 | [diff] [blame] | 1124 | path[level].bp_op(btree, path, level, &key, &ptr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1125 | } |
| 1126 | |
| 1127 | if (!nilfs_bmap_dirty(&btree->bt_bmap)) |
| 1128 | nilfs_bmap_set_dirty(&btree->bt_bmap); |
| 1129 | } |
| 1130 | |
| 1131 | static int nilfs_btree_insert(struct nilfs_bmap *bmap, __u64 key, __u64 ptr) |
| 1132 | { |
| 1133 | struct nilfs_btree *btree; |
| 1134 | struct nilfs_btree_path *path; |
| 1135 | struct nilfs_bmap_stats stats; |
| 1136 | int level, ret; |
| 1137 | |
| 1138 | btree = (struct nilfs_btree *)bmap; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1139 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1140 | if (path == NULL) |
| 1141 | return -ENOMEM; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1142 | nilfs_btree_init_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1143 | |
| 1144 | ret = nilfs_btree_do_lookup(btree, path, key, NULL, |
| 1145 | NILFS_BTREE_LEVEL_NODE_MIN); |
| 1146 | if (ret != -ENOENT) { |
| 1147 | if (ret == 0) |
| 1148 | ret = -EEXIST; |
| 1149 | goto out; |
| 1150 | } |
| 1151 | |
| 1152 | ret = nilfs_btree_prepare_insert(btree, path, &level, key, ptr, &stats); |
| 1153 | if (ret < 0) |
| 1154 | goto out; |
| 1155 | nilfs_btree_commit_insert(btree, path, level, key, ptr); |
| 1156 | nilfs_bmap_add_blocks(bmap, stats.bs_nblocks); |
| 1157 | |
| 1158 | out: |
Ryusuke Konishi | 3218929 | 2009-08-15 01:54:59 +0900 | [diff] [blame] | 1159 | nilfs_btree_release_path(path); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1160 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1161 | return ret; |
| 1162 | } |
| 1163 | |
| 1164 | static void nilfs_btree_do_delete(struct nilfs_btree *btree, |
| 1165 | struct nilfs_btree_path *path, |
| 1166 | int level, __u64 *keyp, __u64 *ptrp) |
| 1167 | { |
| 1168 | struct nilfs_btree_node *node; |
| 1169 | |
| 1170 | if (level < nilfs_btree_height(btree) - 1) { |
| 1171 | lock_buffer(path[level].bp_bh); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1172 | node = nilfs_btree_get_nonroot_node(path, level); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1173 | nilfs_btree_node_delete(btree, node, keyp, ptrp, |
| 1174 | path[level].bp_index); |
| 1175 | if (!buffer_dirty(path[level].bp_bh)) |
| 1176 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 1177 | unlock_buffer(path[level].bp_bh); |
| 1178 | if (path[level].bp_index == 0) |
| 1179 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1180 | nilfs_btree_node_get_key(node, 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1181 | } else { |
| 1182 | node = nilfs_btree_get_root(btree); |
| 1183 | nilfs_btree_node_delete(btree, node, keyp, ptrp, |
| 1184 | path[level].bp_index); |
| 1185 | } |
| 1186 | } |
| 1187 | |
| 1188 | static void nilfs_btree_borrow_left(struct nilfs_btree *btree, |
| 1189 | struct nilfs_btree_path *path, |
| 1190 | int level, __u64 *keyp, __u64 *ptrp) |
| 1191 | { |
| 1192 | struct nilfs_btree_node *node, *left; |
| 1193 | int nchildren, lnchildren, n; |
| 1194 | |
| 1195 | nilfs_btree_do_delete(btree, path, level, keyp, ptrp); |
| 1196 | |
| 1197 | lock_buffer(path[level].bp_bh); |
| 1198 | lock_buffer(path[level].bp_sib_bh); |
| 1199 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1200 | node = nilfs_btree_get_nonroot_node(path, level); |
| 1201 | left = nilfs_btree_get_sib_node(path, level); |
| 1202 | nchildren = nilfs_btree_node_get_nchildren(node); |
| 1203 | lnchildren = nilfs_btree_node_get_nchildren(left); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1204 | |
| 1205 | n = (nchildren + lnchildren) / 2 - nchildren; |
| 1206 | |
| 1207 | nilfs_btree_node_move_right(btree, left, node, n); |
| 1208 | |
| 1209 | if (!buffer_dirty(path[level].bp_bh)) |
| 1210 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 1211 | if (!buffer_dirty(path[level].bp_sib_bh)) |
| 1212 | nilfs_btnode_mark_dirty(path[level].bp_sib_bh); |
| 1213 | |
| 1214 | unlock_buffer(path[level].bp_bh); |
| 1215 | unlock_buffer(path[level].bp_sib_bh); |
| 1216 | |
| 1217 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1218 | nilfs_btree_node_get_key(node, 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1219 | |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1220 | brelse(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1221 | path[level].bp_sib_bh = NULL; |
| 1222 | path[level].bp_index += n; |
| 1223 | } |
| 1224 | |
| 1225 | static void nilfs_btree_borrow_right(struct nilfs_btree *btree, |
| 1226 | struct nilfs_btree_path *path, |
| 1227 | int level, __u64 *keyp, __u64 *ptrp) |
| 1228 | { |
| 1229 | struct nilfs_btree_node *node, *right; |
| 1230 | int nchildren, rnchildren, n; |
| 1231 | |
| 1232 | nilfs_btree_do_delete(btree, path, level, keyp, ptrp); |
| 1233 | |
| 1234 | lock_buffer(path[level].bp_bh); |
| 1235 | lock_buffer(path[level].bp_sib_bh); |
| 1236 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1237 | node = nilfs_btree_get_nonroot_node(path, level); |
| 1238 | right = nilfs_btree_get_sib_node(path, level); |
| 1239 | nchildren = nilfs_btree_node_get_nchildren(node); |
| 1240 | rnchildren = nilfs_btree_node_get_nchildren(right); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1241 | |
| 1242 | n = (nchildren + rnchildren) / 2 - nchildren; |
| 1243 | |
| 1244 | nilfs_btree_node_move_left(btree, node, right, n); |
| 1245 | |
| 1246 | if (!buffer_dirty(path[level].bp_bh)) |
| 1247 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 1248 | if (!buffer_dirty(path[level].bp_sib_bh)) |
| 1249 | nilfs_btnode_mark_dirty(path[level].bp_sib_bh); |
| 1250 | |
| 1251 | unlock_buffer(path[level].bp_bh); |
| 1252 | unlock_buffer(path[level].bp_sib_bh); |
| 1253 | |
| 1254 | path[level + 1].bp_index++; |
| 1255 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1256 | nilfs_btree_node_get_key(right, 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1257 | path[level + 1].bp_index--; |
| 1258 | |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1259 | brelse(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1260 | path[level].bp_sib_bh = NULL; |
| 1261 | } |
| 1262 | |
| 1263 | static void nilfs_btree_concat_left(struct nilfs_btree *btree, |
| 1264 | struct nilfs_btree_path *path, |
| 1265 | int level, __u64 *keyp, __u64 *ptrp) |
| 1266 | { |
| 1267 | struct nilfs_btree_node *node, *left; |
| 1268 | int n; |
| 1269 | |
| 1270 | nilfs_btree_do_delete(btree, path, level, keyp, ptrp); |
| 1271 | |
| 1272 | lock_buffer(path[level].bp_bh); |
| 1273 | lock_buffer(path[level].bp_sib_bh); |
| 1274 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1275 | node = nilfs_btree_get_nonroot_node(path, level); |
| 1276 | left = nilfs_btree_get_sib_node(path, level); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1277 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1278 | n = nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1279 | |
| 1280 | nilfs_btree_node_move_left(btree, left, node, n); |
| 1281 | |
| 1282 | if (!buffer_dirty(path[level].bp_sib_bh)) |
| 1283 | nilfs_btnode_mark_dirty(path[level].bp_sib_bh); |
| 1284 | |
| 1285 | unlock_buffer(path[level].bp_bh); |
| 1286 | unlock_buffer(path[level].bp_sib_bh); |
| 1287 | |
Ryusuke Konishi | 9f09890 | 2009-05-22 00:38:56 +0900 | [diff] [blame] | 1288 | nilfs_btnode_delete(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1289 | path[level].bp_bh = path[level].bp_sib_bh; |
| 1290 | path[level].bp_sib_bh = NULL; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1291 | path[level].bp_index += nilfs_btree_node_get_nchildren(left); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1292 | } |
| 1293 | |
| 1294 | static void nilfs_btree_concat_right(struct nilfs_btree *btree, |
| 1295 | struct nilfs_btree_path *path, |
| 1296 | int level, __u64 *keyp, __u64 *ptrp) |
| 1297 | { |
| 1298 | struct nilfs_btree_node *node, *right; |
| 1299 | int n; |
| 1300 | |
| 1301 | nilfs_btree_do_delete(btree, path, level, keyp, ptrp); |
| 1302 | |
| 1303 | lock_buffer(path[level].bp_bh); |
| 1304 | lock_buffer(path[level].bp_sib_bh); |
| 1305 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1306 | node = nilfs_btree_get_nonroot_node(path, level); |
| 1307 | right = nilfs_btree_get_sib_node(path, level); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1308 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1309 | n = nilfs_btree_node_get_nchildren(right); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1310 | |
| 1311 | nilfs_btree_node_move_left(btree, node, right, n); |
| 1312 | |
| 1313 | if (!buffer_dirty(path[level].bp_bh)) |
| 1314 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 1315 | |
| 1316 | unlock_buffer(path[level].bp_bh); |
| 1317 | unlock_buffer(path[level].bp_sib_bh); |
| 1318 | |
Ryusuke Konishi | 9f09890 | 2009-05-22 00:38:56 +0900 | [diff] [blame] | 1319 | nilfs_btnode_delete(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1320 | path[level].bp_sib_bh = NULL; |
| 1321 | path[level + 1].bp_index++; |
| 1322 | } |
| 1323 | |
| 1324 | static void nilfs_btree_shrink(struct nilfs_btree *btree, |
| 1325 | struct nilfs_btree_path *path, |
| 1326 | int level, __u64 *keyp, __u64 *ptrp) |
| 1327 | { |
| 1328 | struct nilfs_btree_node *root, *child; |
| 1329 | int n; |
| 1330 | |
| 1331 | nilfs_btree_do_delete(btree, path, level, keyp, ptrp); |
| 1332 | |
| 1333 | lock_buffer(path[level].bp_bh); |
| 1334 | root = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1335 | child = nilfs_btree_get_nonroot_node(path, level); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1336 | |
| 1337 | nilfs_btree_node_delete(btree, root, NULL, NULL, 0); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1338 | nilfs_btree_node_set_level(root, level); |
| 1339 | n = nilfs_btree_node_get_nchildren(child); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1340 | nilfs_btree_node_move_left(btree, root, child, n); |
| 1341 | unlock_buffer(path[level].bp_bh); |
| 1342 | |
Ryusuke Konishi | 9f09890 | 2009-05-22 00:38:56 +0900 | [diff] [blame] | 1343 | nilfs_btnode_delete(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1344 | path[level].bp_bh = NULL; |
| 1345 | } |
| 1346 | |
| 1347 | |
| 1348 | static int nilfs_btree_prepare_delete(struct nilfs_btree *btree, |
| 1349 | struct nilfs_btree_path *path, |
| 1350 | int *levelp, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1351 | struct nilfs_bmap_stats *stats, |
| 1352 | struct inode *dat) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1353 | { |
| 1354 | struct buffer_head *bh; |
| 1355 | struct nilfs_btree_node *node, *parent, *sib; |
| 1356 | __u64 sibptr; |
| 1357 | int pindex, level, ret; |
| 1358 | |
| 1359 | ret = 0; |
| 1360 | stats->bs_nblocks = 0; |
| 1361 | for (level = NILFS_BTREE_LEVEL_NODE_MIN; |
| 1362 | level < nilfs_btree_height(btree) - 1; |
| 1363 | level++) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1364 | node = nilfs_btree_get_nonroot_node(path, level); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1365 | path[level].bp_oldreq.bpr_ptr = |
| 1366 | nilfs_btree_node_get_ptr(btree, node, |
| 1367 | path[level].bp_index); |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1368 | ret = nilfs_bmap_prepare_end_ptr(&btree->bt_bmap, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1369 | &path[level].bp_oldreq, dat); |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1370 | if (ret < 0) |
| 1371 | goto err_out_child_node; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1372 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1373 | if (nilfs_btree_node_get_nchildren(node) > |
| 1374 | nilfs_btree_node_nchildren_min(node, btree)) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1375 | path[level].bp_op = nilfs_btree_do_delete; |
| 1376 | stats->bs_nblocks++; |
| 1377 | goto out; |
| 1378 | } |
| 1379 | |
| 1380 | parent = nilfs_btree_get_node(btree, path, level + 1); |
| 1381 | pindex = path[level + 1].bp_index; |
| 1382 | |
| 1383 | if (pindex > 0) { |
| 1384 | /* left sibling */ |
| 1385 | sibptr = nilfs_btree_node_get_ptr(btree, parent, |
| 1386 | pindex - 1); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1387 | ret = nilfs_btree_get_block(btree, sibptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1388 | if (ret < 0) |
| 1389 | goto err_out_curr_node; |
| 1390 | sib = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1391 | if (nilfs_btree_node_get_nchildren(sib) > |
| 1392 | nilfs_btree_node_nchildren_min(sib, btree)) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1393 | path[level].bp_sib_bh = bh; |
| 1394 | path[level].bp_op = nilfs_btree_borrow_left; |
| 1395 | stats->bs_nblocks++; |
| 1396 | goto out; |
| 1397 | } else { |
| 1398 | path[level].bp_sib_bh = bh; |
| 1399 | path[level].bp_op = nilfs_btree_concat_left; |
| 1400 | stats->bs_nblocks++; |
| 1401 | /* continue; */ |
| 1402 | } |
| 1403 | } else if (pindex < |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1404 | nilfs_btree_node_get_nchildren(parent) - 1) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1405 | /* right sibling */ |
| 1406 | sibptr = nilfs_btree_node_get_ptr(btree, parent, |
| 1407 | pindex + 1); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1408 | ret = nilfs_btree_get_block(btree, sibptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1409 | if (ret < 0) |
| 1410 | goto err_out_curr_node; |
| 1411 | sib = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1412 | if (nilfs_btree_node_get_nchildren(sib) > |
| 1413 | nilfs_btree_node_nchildren_min(sib, btree)) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1414 | path[level].bp_sib_bh = bh; |
| 1415 | path[level].bp_op = nilfs_btree_borrow_right; |
| 1416 | stats->bs_nblocks++; |
| 1417 | goto out; |
| 1418 | } else { |
| 1419 | path[level].bp_sib_bh = bh; |
| 1420 | path[level].bp_op = nilfs_btree_concat_right; |
| 1421 | stats->bs_nblocks++; |
| 1422 | /* continue; */ |
| 1423 | } |
| 1424 | } else { |
| 1425 | /* no siblings */ |
| 1426 | /* the only child of the root node */ |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1427 | WARN_ON(level != nilfs_btree_height(btree) - 2); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1428 | if (nilfs_btree_node_get_nchildren(node) - 1 <= |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1429 | NILFS_BTREE_ROOT_NCHILDREN_MAX) { |
| 1430 | path[level].bp_op = nilfs_btree_shrink; |
| 1431 | stats->bs_nblocks += 2; |
| 1432 | } else { |
| 1433 | path[level].bp_op = nilfs_btree_do_delete; |
| 1434 | stats->bs_nblocks++; |
| 1435 | } |
| 1436 | |
| 1437 | goto out; |
| 1438 | |
| 1439 | } |
| 1440 | } |
| 1441 | |
| 1442 | node = nilfs_btree_get_root(btree); |
| 1443 | path[level].bp_oldreq.bpr_ptr = |
| 1444 | nilfs_btree_node_get_ptr(btree, node, path[level].bp_index); |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1445 | |
| 1446 | ret = nilfs_bmap_prepare_end_ptr(&btree->bt_bmap, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1447 | &path[level].bp_oldreq, dat); |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1448 | if (ret < 0) |
| 1449 | goto err_out_child_node; |
| 1450 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1451 | /* child of the root node is deleted */ |
| 1452 | path[level].bp_op = nilfs_btree_do_delete; |
| 1453 | stats->bs_nblocks++; |
| 1454 | |
| 1455 | /* success */ |
| 1456 | out: |
| 1457 | *levelp = level; |
| 1458 | return ret; |
| 1459 | |
| 1460 | /* error */ |
| 1461 | err_out_curr_node: |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1462 | nilfs_bmap_abort_end_ptr(&btree->bt_bmap, &path[level].bp_oldreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1463 | err_out_child_node: |
| 1464 | for (level--; level >= NILFS_BTREE_LEVEL_NODE_MIN; level--) { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1465 | brelse(path[level].bp_sib_bh); |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1466 | nilfs_bmap_abort_end_ptr(&btree->bt_bmap, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1467 | &path[level].bp_oldreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1468 | } |
| 1469 | *levelp = level; |
| 1470 | stats->bs_nblocks = 0; |
| 1471 | return ret; |
| 1472 | } |
| 1473 | |
| 1474 | static void nilfs_btree_commit_delete(struct nilfs_btree *btree, |
| 1475 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1476 | int maxlevel, struct inode *dat) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1477 | { |
| 1478 | int level; |
| 1479 | |
| 1480 | for (level = NILFS_BTREE_LEVEL_NODE_MIN; level <= maxlevel; level++) { |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1481 | nilfs_bmap_commit_end_ptr(&btree->bt_bmap, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1482 | &path[level].bp_oldreq, dat); |
Pekka Enberg | 8acfbf0 | 2009-04-06 19:01:49 -0700 | [diff] [blame] | 1483 | path[level].bp_op(btree, path, level, NULL, NULL); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1484 | } |
| 1485 | |
| 1486 | if (!nilfs_bmap_dirty(&btree->bt_bmap)) |
| 1487 | nilfs_bmap_set_dirty(&btree->bt_bmap); |
| 1488 | } |
| 1489 | |
| 1490 | static int nilfs_btree_delete(struct nilfs_bmap *bmap, __u64 key) |
| 1491 | |
| 1492 | { |
| 1493 | struct nilfs_btree *btree; |
| 1494 | struct nilfs_btree_path *path; |
| 1495 | struct nilfs_bmap_stats stats; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1496 | struct inode *dat; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1497 | int level, ret; |
| 1498 | |
| 1499 | btree = (struct nilfs_btree *)bmap; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1500 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1501 | if (path == NULL) |
| 1502 | return -ENOMEM; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1503 | nilfs_btree_init_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1504 | ret = nilfs_btree_do_lookup(btree, path, key, NULL, |
| 1505 | NILFS_BTREE_LEVEL_NODE_MIN); |
| 1506 | if (ret < 0) |
| 1507 | goto out; |
| 1508 | |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1509 | |
| 1510 | dat = NILFS_BMAP_USE_VBN(&btree->bt_bmap) ? |
| 1511 | nilfs_bmap_get_dat(&btree->bt_bmap) : NULL; |
| 1512 | |
| 1513 | ret = nilfs_btree_prepare_delete(btree, path, &level, &stats, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1514 | if (ret < 0) |
| 1515 | goto out; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1516 | nilfs_btree_commit_delete(btree, path, level, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1517 | nilfs_bmap_sub_blocks(bmap, stats.bs_nblocks); |
| 1518 | |
| 1519 | out: |
Ryusuke Konishi | 3218929 | 2009-08-15 01:54:59 +0900 | [diff] [blame] | 1520 | nilfs_btree_release_path(path); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1521 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1522 | return ret; |
| 1523 | } |
| 1524 | |
| 1525 | static int nilfs_btree_last_key(const struct nilfs_bmap *bmap, __u64 *keyp) |
| 1526 | { |
| 1527 | struct nilfs_btree *btree; |
| 1528 | struct nilfs_btree_path *path; |
| 1529 | int ret; |
| 1530 | |
| 1531 | btree = (struct nilfs_btree *)bmap; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1532 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1533 | if (path == NULL) |
| 1534 | return -ENOMEM; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1535 | nilfs_btree_init_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1536 | |
| 1537 | ret = nilfs_btree_do_lookup_last(btree, path, keyp, NULL); |
| 1538 | |
Ryusuke Konishi | 3218929 | 2009-08-15 01:54:59 +0900 | [diff] [blame] | 1539 | nilfs_btree_release_path(path); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1540 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1541 | |
| 1542 | return ret; |
| 1543 | } |
| 1544 | |
| 1545 | static int nilfs_btree_check_delete(struct nilfs_bmap *bmap, __u64 key) |
| 1546 | { |
| 1547 | struct buffer_head *bh; |
| 1548 | struct nilfs_btree *btree; |
| 1549 | struct nilfs_btree_node *root, *node; |
| 1550 | __u64 maxkey, nextmaxkey; |
| 1551 | __u64 ptr; |
| 1552 | int nchildren, ret; |
| 1553 | |
| 1554 | btree = (struct nilfs_btree *)bmap; |
| 1555 | root = nilfs_btree_get_root(btree); |
| 1556 | switch (nilfs_btree_height(btree)) { |
| 1557 | case 2: |
| 1558 | bh = NULL; |
| 1559 | node = root; |
| 1560 | break; |
| 1561 | case 3: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1562 | nchildren = nilfs_btree_node_get_nchildren(root); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1563 | if (nchildren > 1) |
| 1564 | return 0; |
| 1565 | ptr = nilfs_btree_node_get_ptr(btree, root, nchildren - 1); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1566 | ret = nilfs_btree_get_block(btree, ptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1567 | if (ret < 0) |
| 1568 | return ret; |
| 1569 | node = (struct nilfs_btree_node *)bh->b_data; |
| 1570 | break; |
| 1571 | default: |
| 1572 | return 0; |
| 1573 | } |
| 1574 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1575 | nchildren = nilfs_btree_node_get_nchildren(node); |
| 1576 | maxkey = nilfs_btree_node_get_key(node, nchildren - 1); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1577 | nextmaxkey = (nchildren > 1) ? |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1578 | nilfs_btree_node_get_key(node, nchildren - 2) : 0; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1579 | if (bh != NULL) |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1580 | brelse(bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1581 | |
Ryusuke Konishi | 3033342 | 2009-05-24 00:09:44 +0900 | [diff] [blame] | 1582 | return (maxkey == key) && (nextmaxkey < NILFS_BMAP_LARGE_LOW); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1583 | } |
| 1584 | |
| 1585 | static int nilfs_btree_gather_data(struct nilfs_bmap *bmap, |
| 1586 | __u64 *keys, __u64 *ptrs, int nitems) |
| 1587 | { |
| 1588 | struct buffer_head *bh; |
| 1589 | struct nilfs_btree *btree; |
| 1590 | struct nilfs_btree_node *node, *root; |
| 1591 | __le64 *dkeys; |
| 1592 | __le64 *dptrs; |
| 1593 | __u64 ptr; |
| 1594 | int nchildren, i, ret; |
| 1595 | |
| 1596 | btree = (struct nilfs_btree *)bmap; |
| 1597 | root = nilfs_btree_get_root(btree); |
| 1598 | switch (nilfs_btree_height(btree)) { |
| 1599 | case 2: |
| 1600 | bh = NULL; |
| 1601 | node = root; |
| 1602 | break; |
| 1603 | case 3: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1604 | nchildren = nilfs_btree_node_get_nchildren(root); |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1605 | WARN_ON(nchildren > 1); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1606 | ptr = nilfs_btree_node_get_ptr(btree, root, nchildren - 1); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1607 | ret = nilfs_btree_get_block(btree, ptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1608 | if (ret < 0) |
| 1609 | return ret; |
| 1610 | node = (struct nilfs_btree_node *)bh->b_data; |
| 1611 | break; |
| 1612 | default: |
| 1613 | node = NULL; |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1614 | return -EINVAL; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1615 | } |
| 1616 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1617 | nchildren = nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1618 | if (nchildren < nitems) |
| 1619 | nitems = nchildren; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1620 | dkeys = nilfs_btree_node_dkeys(node); |
| 1621 | dptrs = nilfs_btree_node_dptrs(node, btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1622 | for (i = 0; i < nitems; i++) { |
| 1623 | keys[i] = nilfs_bmap_dkey_to_key(dkeys[i]); |
| 1624 | ptrs[i] = nilfs_bmap_dptr_to_ptr(dptrs[i]); |
| 1625 | } |
| 1626 | |
| 1627 | if (bh != NULL) |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1628 | brelse(bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1629 | |
| 1630 | return nitems; |
| 1631 | } |
| 1632 | |
| 1633 | static int |
| 1634 | nilfs_btree_prepare_convert_and_insert(struct nilfs_bmap *bmap, __u64 key, |
| 1635 | union nilfs_bmap_ptr_req *dreq, |
| 1636 | union nilfs_bmap_ptr_req *nreq, |
| 1637 | struct buffer_head **bhp, |
| 1638 | struct nilfs_bmap_stats *stats) |
| 1639 | { |
| 1640 | struct buffer_head *bh; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1641 | struct nilfs_btree *btree = (struct nilfs_btree *)bmap; |
| 1642 | struct inode *dat = NULL; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1643 | int ret; |
| 1644 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1645 | stats->bs_nblocks = 0; |
| 1646 | |
| 1647 | /* for data */ |
| 1648 | /* cannot find near ptr */ |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1649 | if (NILFS_BMAP_USE_VBN(bmap)) { |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 1650 | dreq->bpr_ptr = nilfs_btree_find_target_v(btree, NULL, key); |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1651 | dat = nilfs_bmap_get_dat(bmap); |
| 1652 | } |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 1653 | |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1654 | ret = nilfs_bmap_prepare_alloc_ptr(bmap, dreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1655 | if (ret < 0) |
| 1656 | return ret; |
| 1657 | |
| 1658 | *bhp = NULL; |
| 1659 | stats->bs_nblocks++; |
| 1660 | if (nreq != NULL) { |
| 1661 | nreq->bpr_ptr = dreq->bpr_ptr + 1; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1662 | ret = nilfs_bmap_prepare_alloc_ptr(bmap, nreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1663 | if (ret < 0) |
| 1664 | goto err_out_dreq; |
| 1665 | |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1666 | ret = nilfs_btree_get_new_block(btree, nreq->bpr_ptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1667 | if (ret < 0) |
| 1668 | goto err_out_nreq; |
| 1669 | |
| 1670 | *bhp = bh; |
| 1671 | stats->bs_nblocks++; |
| 1672 | } |
| 1673 | |
| 1674 | /* success */ |
| 1675 | return 0; |
| 1676 | |
| 1677 | /* error */ |
| 1678 | err_out_nreq: |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1679 | nilfs_bmap_abort_alloc_ptr(bmap, nreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1680 | err_out_dreq: |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1681 | nilfs_bmap_abort_alloc_ptr(bmap, dreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1682 | stats->bs_nblocks = 0; |
| 1683 | return ret; |
| 1684 | |
| 1685 | } |
| 1686 | |
| 1687 | static void |
| 1688 | nilfs_btree_commit_convert_and_insert(struct nilfs_bmap *bmap, |
| 1689 | __u64 key, __u64 ptr, |
| 1690 | const __u64 *keys, const __u64 *ptrs, |
Ryusuke Konishi | 3033342 | 2009-05-24 00:09:44 +0900 | [diff] [blame] | 1691 | int n, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1692 | union nilfs_bmap_ptr_req *dreq, |
| 1693 | union nilfs_bmap_ptr_req *nreq, |
| 1694 | struct buffer_head *bh) |
| 1695 | { |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1696 | struct nilfs_btree *btree = (struct nilfs_btree *)bmap; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1697 | struct nilfs_btree_node *node; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1698 | struct inode *dat; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1699 | __u64 tmpptr; |
| 1700 | |
| 1701 | /* free resources */ |
| 1702 | if (bmap->b_ops->bop_clear != NULL) |
Pekka Enberg | 8acfbf0 | 2009-04-06 19:01:49 -0700 | [diff] [blame] | 1703 | bmap->b_ops->bop_clear(bmap); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1704 | |
| 1705 | /* ptr must be a pointer to a buffer head. */ |
| 1706 | set_buffer_nilfs_volatile((struct buffer_head *)((unsigned long)ptr)); |
| 1707 | |
| 1708 | /* convert and insert */ |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1709 | dat = NILFS_BMAP_USE_VBN(bmap) ? nilfs_bmap_get_dat(bmap) : NULL; |
Ryusuke Konishi | 3033342 | 2009-05-24 00:09:44 +0900 | [diff] [blame] | 1710 | nilfs_btree_init(bmap); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1711 | if (nreq != NULL) { |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1712 | nilfs_bmap_commit_alloc_ptr(bmap, dreq, dat); |
| 1713 | nilfs_bmap_commit_alloc_ptr(bmap, nreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1714 | |
| 1715 | /* create child node at level 1 */ |
| 1716 | lock_buffer(bh); |
| 1717 | node = (struct nilfs_btree_node *)bh->b_data; |
| 1718 | nilfs_btree_node_init(btree, node, 0, 1, n, keys, ptrs); |
| 1719 | nilfs_btree_node_insert(btree, node, |
| 1720 | key, dreq->bpr_ptr, n); |
| 1721 | if (!buffer_dirty(bh)) |
| 1722 | nilfs_btnode_mark_dirty(bh); |
| 1723 | if (!nilfs_bmap_dirty(bmap)) |
| 1724 | nilfs_bmap_set_dirty(bmap); |
| 1725 | |
| 1726 | unlock_buffer(bh); |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1727 | brelse(bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1728 | |
| 1729 | /* create root node at level 2 */ |
| 1730 | node = nilfs_btree_get_root(btree); |
| 1731 | tmpptr = nreq->bpr_ptr; |
| 1732 | nilfs_btree_node_init(btree, node, NILFS_BTREE_NODE_ROOT, |
| 1733 | 2, 1, &keys[0], &tmpptr); |
| 1734 | } else { |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1735 | nilfs_bmap_commit_alloc_ptr(bmap, dreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1736 | |
| 1737 | /* create root node at level 1 */ |
| 1738 | node = nilfs_btree_get_root(btree); |
| 1739 | nilfs_btree_node_init(btree, node, NILFS_BTREE_NODE_ROOT, |
| 1740 | 1, n, keys, ptrs); |
| 1741 | nilfs_btree_node_insert(btree, node, |
| 1742 | key, dreq->bpr_ptr, n); |
| 1743 | if (!nilfs_bmap_dirty(bmap)) |
| 1744 | nilfs_bmap_set_dirty(bmap); |
| 1745 | } |
| 1746 | |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 1747 | if (NILFS_BMAP_USE_VBN(bmap)) |
| 1748 | nilfs_btree_set_target_v(btree, key, dreq->bpr_ptr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1749 | } |
| 1750 | |
| 1751 | /** |
| 1752 | * nilfs_btree_convert_and_insert - |
| 1753 | * @bmap: |
| 1754 | * @key: |
| 1755 | * @ptr: |
| 1756 | * @keys: |
| 1757 | * @ptrs: |
| 1758 | * @n: |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1759 | */ |
| 1760 | int nilfs_btree_convert_and_insert(struct nilfs_bmap *bmap, |
| 1761 | __u64 key, __u64 ptr, |
Ryusuke Konishi | 3033342 | 2009-05-24 00:09:44 +0900 | [diff] [blame] | 1762 | const __u64 *keys, const __u64 *ptrs, int n) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1763 | { |
| 1764 | struct buffer_head *bh; |
| 1765 | union nilfs_bmap_ptr_req dreq, nreq, *di, *ni; |
| 1766 | struct nilfs_bmap_stats stats; |
| 1767 | int ret; |
| 1768 | |
| 1769 | if (n + 1 <= NILFS_BTREE_ROOT_NCHILDREN_MAX) { |
| 1770 | di = &dreq; |
| 1771 | ni = NULL; |
| 1772 | } else if ((n + 1) <= NILFS_BTREE_NODE_NCHILDREN_MAX( |
| 1773 | 1 << bmap->b_inode->i_blkbits)) { |
| 1774 | di = &dreq; |
| 1775 | ni = &nreq; |
| 1776 | } else { |
| 1777 | di = NULL; |
| 1778 | ni = NULL; |
| 1779 | BUG(); |
| 1780 | } |
| 1781 | |
| 1782 | ret = nilfs_btree_prepare_convert_and_insert(bmap, key, di, ni, &bh, |
| 1783 | &stats); |
| 1784 | if (ret < 0) |
| 1785 | return ret; |
| 1786 | nilfs_btree_commit_convert_and_insert(bmap, key, ptr, keys, ptrs, n, |
Ryusuke Konishi | 3033342 | 2009-05-24 00:09:44 +0900 | [diff] [blame] | 1787 | di, ni, bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1788 | nilfs_bmap_add_blocks(bmap, stats.bs_nblocks); |
| 1789 | return 0; |
| 1790 | } |
| 1791 | |
| 1792 | static int nilfs_btree_propagate_p(struct nilfs_btree *btree, |
| 1793 | struct nilfs_btree_path *path, |
| 1794 | int level, |
| 1795 | struct buffer_head *bh) |
| 1796 | { |
| 1797 | while ((++level < nilfs_btree_height(btree) - 1) && |
| 1798 | !buffer_dirty(path[level].bp_bh)) |
| 1799 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 1800 | |
| 1801 | return 0; |
| 1802 | } |
| 1803 | |
| 1804 | static int nilfs_btree_prepare_update_v(struct nilfs_btree *btree, |
| 1805 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1806 | int level, struct inode *dat) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1807 | { |
| 1808 | struct nilfs_btree_node *parent; |
| 1809 | int ret; |
| 1810 | |
| 1811 | parent = nilfs_btree_get_node(btree, path, level + 1); |
| 1812 | path[level].bp_oldreq.bpr_ptr = |
| 1813 | nilfs_btree_node_get_ptr(btree, parent, |
| 1814 | path[level + 1].bp_index); |
| 1815 | path[level].bp_newreq.bpr_ptr = path[level].bp_oldreq.bpr_ptr + 1; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1816 | ret = nilfs_dat_prepare_update(dat, &path[level].bp_oldreq.bpr_req, |
| 1817 | &path[level].bp_newreq.bpr_req); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1818 | if (ret < 0) |
| 1819 | return ret; |
| 1820 | |
| 1821 | if (buffer_nilfs_node(path[level].bp_bh)) { |
| 1822 | path[level].bp_ctxt.oldkey = path[level].bp_oldreq.bpr_ptr; |
| 1823 | path[level].bp_ctxt.newkey = path[level].bp_newreq.bpr_ptr; |
| 1824 | path[level].bp_ctxt.bh = path[level].bp_bh; |
| 1825 | ret = nilfs_btnode_prepare_change_key( |
| 1826 | &NILFS_BMAP_I(&btree->bt_bmap)->i_btnode_cache, |
| 1827 | &path[level].bp_ctxt); |
| 1828 | if (ret < 0) { |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1829 | nilfs_dat_abort_update(dat, |
| 1830 | &path[level].bp_oldreq.bpr_req, |
| 1831 | &path[level].bp_newreq.bpr_req); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1832 | return ret; |
| 1833 | } |
| 1834 | } |
| 1835 | |
| 1836 | return 0; |
| 1837 | } |
| 1838 | |
| 1839 | static void nilfs_btree_commit_update_v(struct nilfs_btree *btree, |
| 1840 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1841 | int level, struct inode *dat) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1842 | { |
| 1843 | struct nilfs_btree_node *parent; |
| 1844 | |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1845 | nilfs_dat_commit_update(dat, &path[level].bp_oldreq.bpr_req, |
| 1846 | &path[level].bp_newreq.bpr_req, |
| 1847 | btree->bt_bmap.b_ptr_type == NILFS_BMAP_PTR_VS); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1848 | |
| 1849 | if (buffer_nilfs_node(path[level].bp_bh)) { |
| 1850 | nilfs_btnode_commit_change_key( |
| 1851 | &NILFS_BMAP_I(&btree->bt_bmap)->i_btnode_cache, |
| 1852 | &path[level].bp_ctxt); |
| 1853 | path[level].bp_bh = path[level].bp_ctxt.bh; |
| 1854 | } |
| 1855 | set_buffer_nilfs_volatile(path[level].bp_bh); |
| 1856 | |
| 1857 | parent = nilfs_btree_get_node(btree, path, level + 1); |
| 1858 | nilfs_btree_node_set_ptr(btree, parent, path[level + 1].bp_index, |
| 1859 | path[level].bp_newreq.bpr_ptr); |
| 1860 | } |
| 1861 | |
| 1862 | static void nilfs_btree_abort_update_v(struct nilfs_btree *btree, |
| 1863 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1864 | int level, struct inode *dat) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1865 | { |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1866 | nilfs_dat_abort_update(dat, &path[level].bp_oldreq.bpr_req, |
| 1867 | &path[level].bp_newreq.bpr_req); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1868 | if (buffer_nilfs_node(path[level].bp_bh)) |
| 1869 | nilfs_btnode_abort_change_key( |
| 1870 | &NILFS_BMAP_I(&btree->bt_bmap)->i_btnode_cache, |
| 1871 | &path[level].bp_ctxt); |
| 1872 | } |
| 1873 | |
| 1874 | static int nilfs_btree_prepare_propagate_v(struct nilfs_btree *btree, |
| 1875 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1876 | int minlevel, int *maxlevelp, |
| 1877 | struct inode *dat) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1878 | { |
| 1879 | int level, ret; |
| 1880 | |
| 1881 | level = minlevel; |
| 1882 | if (!buffer_nilfs_volatile(path[level].bp_bh)) { |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1883 | ret = nilfs_btree_prepare_update_v(btree, path, level, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1884 | if (ret < 0) |
| 1885 | return ret; |
| 1886 | } |
| 1887 | while ((++level < nilfs_btree_height(btree) - 1) && |
| 1888 | !buffer_dirty(path[level].bp_bh)) { |
| 1889 | |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1890 | WARN_ON(buffer_nilfs_volatile(path[level].bp_bh)); |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1891 | ret = nilfs_btree_prepare_update_v(btree, path, level, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1892 | if (ret < 0) |
| 1893 | goto out; |
| 1894 | } |
| 1895 | |
| 1896 | /* success */ |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1897 | *maxlevelp = level - 1; |
| 1898 | return 0; |
| 1899 | |
| 1900 | /* error */ |
| 1901 | out: |
| 1902 | while (--level > minlevel) |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1903 | nilfs_btree_abort_update_v(btree, path, level, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1904 | if (!buffer_nilfs_volatile(path[level].bp_bh)) |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1905 | nilfs_btree_abort_update_v(btree, path, level, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1906 | return ret; |
| 1907 | } |
| 1908 | |
| 1909 | static void nilfs_btree_commit_propagate_v(struct nilfs_btree *btree, |
| 1910 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1911 | int minlevel, int maxlevel, |
| 1912 | struct buffer_head *bh, |
| 1913 | struct inode *dat) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1914 | { |
| 1915 | int level; |
| 1916 | |
| 1917 | if (!buffer_nilfs_volatile(path[minlevel].bp_bh)) |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1918 | nilfs_btree_commit_update_v(btree, path, minlevel, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1919 | |
| 1920 | for (level = minlevel + 1; level <= maxlevel; level++) |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1921 | nilfs_btree_commit_update_v(btree, path, level, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1922 | } |
| 1923 | |
| 1924 | static int nilfs_btree_propagate_v(struct nilfs_btree *btree, |
| 1925 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1926 | int level, struct buffer_head *bh) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1927 | { |
| 1928 | int maxlevel, ret; |
| 1929 | struct nilfs_btree_node *parent; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1930 | struct inode *dat = nilfs_bmap_get_dat(&btree->bt_bmap); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1931 | __u64 ptr; |
| 1932 | |
| 1933 | get_bh(bh); |
| 1934 | path[level].bp_bh = bh; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1935 | ret = nilfs_btree_prepare_propagate_v(btree, path, level, &maxlevel, |
| 1936 | dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1937 | if (ret < 0) |
| 1938 | goto out; |
| 1939 | |
| 1940 | if (buffer_nilfs_volatile(path[level].bp_bh)) { |
| 1941 | parent = nilfs_btree_get_node(btree, path, level + 1); |
| 1942 | ptr = nilfs_btree_node_get_ptr(btree, parent, |
| 1943 | path[level + 1].bp_index); |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1944 | ret = nilfs_dat_mark_dirty(dat, ptr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1945 | if (ret < 0) |
| 1946 | goto out; |
| 1947 | } |
| 1948 | |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1949 | nilfs_btree_commit_propagate_v(btree, path, level, maxlevel, bh, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1950 | |
| 1951 | out: |
| 1952 | brelse(path[level].bp_bh); |
| 1953 | path[level].bp_bh = NULL; |
| 1954 | return ret; |
| 1955 | } |
| 1956 | |
| 1957 | static int nilfs_btree_propagate(const struct nilfs_bmap *bmap, |
| 1958 | struct buffer_head *bh) |
| 1959 | { |
| 1960 | struct nilfs_btree *btree; |
| 1961 | struct nilfs_btree_path *path; |
| 1962 | struct nilfs_btree_node *node; |
| 1963 | __u64 key; |
| 1964 | int level, ret; |
| 1965 | |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1966 | WARN_ON(!buffer_dirty(bh)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1967 | |
| 1968 | btree = (struct nilfs_btree *)bmap; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1969 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1970 | if (path == NULL) |
| 1971 | return -ENOMEM; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1972 | nilfs_btree_init_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1973 | |
| 1974 | if (buffer_nilfs_node(bh)) { |
| 1975 | node = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1976 | key = nilfs_btree_node_get_key(node, 0); |
| 1977 | level = nilfs_btree_node_get_level(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1978 | } else { |
| 1979 | key = nilfs_bmap_data_get_key(bmap, bh); |
| 1980 | level = NILFS_BTREE_LEVEL_DATA; |
| 1981 | } |
| 1982 | |
| 1983 | ret = nilfs_btree_do_lookup(btree, path, key, NULL, level + 1); |
| 1984 | if (ret < 0) { |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1985 | if (unlikely(ret == -ENOENT)) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1986 | printk(KERN_CRIT "%s: key = %llu, level == %d\n", |
| 1987 | __func__, (unsigned long long)key, level); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1988 | goto out; |
| 1989 | } |
| 1990 | |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 1991 | ret = NILFS_BMAP_USE_VBN(bmap) ? |
| 1992 | nilfs_btree_propagate_v(btree, path, level, bh) : |
| 1993 | nilfs_btree_propagate_p(btree, path, level, bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1994 | |
| 1995 | out: |
Ryusuke Konishi | 3218929 | 2009-08-15 01:54:59 +0900 | [diff] [blame] | 1996 | nilfs_btree_release_path(path); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1997 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1998 | |
| 1999 | return ret; |
| 2000 | } |
| 2001 | |
| 2002 | static int nilfs_btree_propagate_gc(const struct nilfs_bmap *bmap, |
| 2003 | struct buffer_head *bh) |
| 2004 | { |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 2005 | return nilfs_dat_mark_dirty(nilfs_bmap_get_dat(bmap), bh->b_blocknr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2006 | } |
| 2007 | |
| 2008 | static void nilfs_btree_add_dirty_buffer(struct nilfs_btree *btree, |
| 2009 | struct list_head *lists, |
| 2010 | struct buffer_head *bh) |
| 2011 | { |
| 2012 | struct list_head *head; |
| 2013 | struct buffer_head *cbh; |
| 2014 | struct nilfs_btree_node *node, *cnode; |
| 2015 | __u64 key, ckey; |
| 2016 | int level; |
| 2017 | |
| 2018 | get_bh(bh); |
| 2019 | node = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2020 | key = nilfs_btree_node_get_key(node, 0); |
| 2021 | level = nilfs_btree_node_get_level(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2022 | list_for_each(head, &lists[level]) { |
| 2023 | cbh = list_entry(head, struct buffer_head, b_assoc_buffers); |
| 2024 | cnode = (struct nilfs_btree_node *)cbh->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2025 | ckey = nilfs_btree_node_get_key(cnode, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2026 | if (key < ckey) |
| 2027 | break; |
| 2028 | } |
| 2029 | list_add_tail(&bh->b_assoc_buffers, head); |
| 2030 | } |
| 2031 | |
| 2032 | static void nilfs_btree_lookup_dirty_buffers(struct nilfs_bmap *bmap, |
| 2033 | struct list_head *listp) |
| 2034 | { |
| 2035 | struct nilfs_btree *btree = (struct nilfs_btree *)bmap; |
| 2036 | struct address_space *btcache = &NILFS_BMAP_I(bmap)->i_btnode_cache; |
| 2037 | struct list_head lists[NILFS_BTREE_LEVEL_MAX]; |
| 2038 | struct pagevec pvec; |
| 2039 | struct buffer_head *bh, *head; |
| 2040 | pgoff_t index = 0; |
| 2041 | int level, i; |
| 2042 | |
| 2043 | for (level = NILFS_BTREE_LEVEL_NODE_MIN; |
| 2044 | level < NILFS_BTREE_LEVEL_MAX; |
| 2045 | level++) |
| 2046 | INIT_LIST_HEAD(&lists[level]); |
| 2047 | |
| 2048 | pagevec_init(&pvec, 0); |
| 2049 | |
| 2050 | while (pagevec_lookup_tag(&pvec, btcache, &index, PAGECACHE_TAG_DIRTY, |
| 2051 | PAGEVEC_SIZE)) { |
| 2052 | for (i = 0; i < pagevec_count(&pvec); i++) { |
| 2053 | bh = head = page_buffers(pvec.pages[i]); |
| 2054 | do { |
| 2055 | if (buffer_dirty(bh)) |
| 2056 | nilfs_btree_add_dirty_buffer(btree, |
| 2057 | lists, bh); |
| 2058 | } while ((bh = bh->b_this_page) != head); |
| 2059 | } |
| 2060 | pagevec_release(&pvec); |
| 2061 | cond_resched(); |
| 2062 | } |
| 2063 | |
| 2064 | for (level = NILFS_BTREE_LEVEL_NODE_MIN; |
| 2065 | level < NILFS_BTREE_LEVEL_MAX; |
| 2066 | level++) |
| 2067 | list_splice(&lists[level], listp->prev); |
| 2068 | } |
| 2069 | |
| 2070 | static int nilfs_btree_assign_p(struct nilfs_btree *btree, |
| 2071 | struct nilfs_btree_path *path, |
| 2072 | int level, |
| 2073 | struct buffer_head **bh, |
| 2074 | sector_t blocknr, |
| 2075 | union nilfs_binfo *binfo) |
| 2076 | { |
| 2077 | struct nilfs_btree_node *parent; |
| 2078 | __u64 key; |
| 2079 | __u64 ptr; |
| 2080 | int ret; |
| 2081 | |
| 2082 | parent = nilfs_btree_get_node(btree, path, level + 1); |
| 2083 | ptr = nilfs_btree_node_get_ptr(btree, parent, |
| 2084 | path[level + 1].bp_index); |
| 2085 | if (buffer_nilfs_node(*bh)) { |
| 2086 | path[level].bp_ctxt.oldkey = ptr; |
| 2087 | path[level].bp_ctxt.newkey = blocknr; |
| 2088 | path[level].bp_ctxt.bh = *bh; |
| 2089 | ret = nilfs_btnode_prepare_change_key( |
| 2090 | &NILFS_BMAP_I(&btree->bt_bmap)->i_btnode_cache, |
| 2091 | &path[level].bp_ctxt); |
| 2092 | if (ret < 0) |
| 2093 | return ret; |
| 2094 | nilfs_btnode_commit_change_key( |
| 2095 | &NILFS_BMAP_I(&btree->bt_bmap)->i_btnode_cache, |
| 2096 | &path[level].bp_ctxt); |
| 2097 | *bh = path[level].bp_ctxt.bh; |
| 2098 | } |
| 2099 | |
| 2100 | nilfs_btree_node_set_ptr(btree, parent, |
| 2101 | path[level + 1].bp_index, blocknr); |
| 2102 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2103 | key = nilfs_btree_node_get_key(parent, path[level + 1].bp_index); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2104 | /* on-disk format */ |
| 2105 | binfo->bi_dat.bi_blkoff = nilfs_bmap_key_to_dkey(key); |
| 2106 | binfo->bi_dat.bi_level = level; |
| 2107 | |
| 2108 | return 0; |
| 2109 | } |
| 2110 | |
| 2111 | static int nilfs_btree_assign_v(struct nilfs_btree *btree, |
| 2112 | struct nilfs_btree_path *path, |
| 2113 | int level, |
| 2114 | struct buffer_head **bh, |
| 2115 | sector_t blocknr, |
| 2116 | union nilfs_binfo *binfo) |
| 2117 | { |
| 2118 | struct nilfs_btree_node *parent; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 2119 | struct inode *dat = nilfs_bmap_get_dat(&btree->bt_bmap); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2120 | __u64 key; |
| 2121 | __u64 ptr; |
| 2122 | union nilfs_bmap_ptr_req req; |
| 2123 | int ret; |
| 2124 | |
| 2125 | parent = nilfs_btree_get_node(btree, path, level + 1); |
| 2126 | ptr = nilfs_btree_node_get_ptr(btree, parent, |
| 2127 | path[level + 1].bp_index); |
| 2128 | req.bpr_ptr = ptr; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 2129 | ret = nilfs_dat_prepare_start(dat, &req.bpr_req); |
| 2130 | if (ret < 0) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2131 | return ret; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 2132 | nilfs_dat_commit_start(dat, &req.bpr_req, blocknr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2133 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2134 | key = nilfs_btree_node_get_key(parent, path[level + 1].bp_index); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2135 | /* on-disk format */ |
| 2136 | binfo->bi_v.bi_vblocknr = nilfs_bmap_ptr_to_dptr(ptr); |
| 2137 | binfo->bi_v.bi_blkoff = nilfs_bmap_key_to_dkey(key); |
| 2138 | |
| 2139 | return 0; |
| 2140 | } |
| 2141 | |
| 2142 | static int nilfs_btree_assign(struct nilfs_bmap *bmap, |
| 2143 | struct buffer_head **bh, |
| 2144 | sector_t blocknr, |
| 2145 | union nilfs_binfo *binfo) |
| 2146 | { |
| 2147 | struct nilfs_btree *btree; |
| 2148 | struct nilfs_btree_path *path; |
| 2149 | struct nilfs_btree_node *node; |
| 2150 | __u64 key; |
| 2151 | int level, ret; |
| 2152 | |
| 2153 | btree = (struct nilfs_btree *)bmap; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2154 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2155 | if (path == NULL) |
| 2156 | return -ENOMEM; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2157 | nilfs_btree_init_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2158 | |
| 2159 | if (buffer_nilfs_node(*bh)) { |
| 2160 | node = (struct nilfs_btree_node *)(*bh)->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2161 | key = nilfs_btree_node_get_key(node, 0); |
| 2162 | level = nilfs_btree_node_get_level(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2163 | } else { |
| 2164 | key = nilfs_bmap_data_get_key(bmap, *bh); |
| 2165 | level = NILFS_BTREE_LEVEL_DATA; |
| 2166 | } |
| 2167 | |
| 2168 | ret = nilfs_btree_do_lookup(btree, path, key, NULL, level + 1); |
| 2169 | if (ret < 0) { |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 2170 | WARN_ON(ret == -ENOENT); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2171 | goto out; |
| 2172 | } |
| 2173 | |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 2174 | ret = NILFS_BMAP_USE_VBN(bmap) ? |
| 2175 | nilfs_btree_assign_v(btree, path, level, bh, blocknr, binfo) : |
| 2176 | nilfs_btree_assign_p(btree, path, level, bh, blocknr, binfo); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2177 | |
| 2178 | out: |
Ryusuke Konishi | 3218929 | 2009-08-15 01:54:59 +0900 | [diff] [blame] | 2179 | nilfs_btree_release_path(path); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2180 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2181 | |
| 2182 | return ret; |
| 2183 | } |
| 2184 | |
| 2185 | static int nilfs_btree_assign_gc(struct nilfs_bmap *bmap, |
| 2186 | struct buffer_head **bh, |
| 2187 | sector_t blocknr, |
| 2188 | union nilfs_binfo *binfo) |
| 2189 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2190 | struct nilfs_btree_node *node; |
| 2191 | __u64 key; |
| 2192 | int ret; |
| 2193 | |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 2194 | ret = nilfs_dat_move(nilfs_bmap_get_dat(bmap), (*bh)->b_blocknr, |
| 2195 | blocknr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2196 | if (ret < 0) |
| 2197 | return ret; |
| 2198 | |
| 2199 | if (buffer_nilfs_node(*bh)) { |
| 2200 | node = (struct nilfs_btree_node *)(*bh)->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2201 | key = nilfs_btree_node_get_key(node, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2202 | } else |
| 2203 | key = nilfs_bmap_data_get_key(bmap, *bh); |
| 2204 | |
| 2205 | /* on-disk format */ |
| 2206 | binfo->bi_v.bi_vblocknr = cpu_to_le64((*bh)->b_blocknr); |
| 2207 | binfo->bi_v.bi_blkoff = nilfs_bmap_key_to_dkey(key); |
| 2208 | |
| 2209 | return 0; |
| 2210 | } |
| 2211 | |
| 2212 | static int nilfs_btree_mark(struct nilfs_bmap *bmap, __u64 key, int level) |
| 2213 | { |
| 2214 | struct buffer_head *bh; |
| 2215 | struct nilfs_btree *btree; |
| 2216 | struct nilfs_btree_path *path; |
| 2217 | __u64 ptr; |
| 2218 | int ret; |
| 2219 | |
| 2220 | btree = (struct nilfs_btree *)bmap; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2221 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2222 | if (path == NULL) |
| 2223 | return -ENOMEM; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2224 | nilfs_btree_init_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2225 | |
| 2226 | ret = nilfs_btree_do_lookup(btree, path, key, &ptr, level + 1); |
| 2227 | if (ret < 0) { |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 2228 | WARN_ON(ret == -ENOENT); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2229 | goto out; |
| 2230 | } |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 2231 | ret = nilfs_btree_get_block(btree, ptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2232 | if (ret < 0) { |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 2233 | WARN_ON(ret == -ENOENT); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2234 | goto out; |
| 2235 | } |
| 2236 | |
| 2237 | if (!buffer_dirty(bh)) |
| 2238 | nilfs_btnode_mark_dirty(bh); |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 2239 | brelse(bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2240 | if (!nilfs_bmap_dirty(&btree->bt_bmap)) |
| 2241 | nilfs_bmap_set_dirty(&btree->bt_bmap); |
| 2242 | |
| 2243 | out: |
Ryusuke Konishi | 3218929 | 2009-08-15 01:54:59 +0900 | [diff] [blame] | 2244 | nilfs_btree_release_path(path); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2245 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2246 | return ret; |
| 2247 | } |
| 2248 | |
| 2249 | static const struct nilfs_bmap_operations nilfs_btree_ops = { |
| 2250 | .bop_lookup = nilfs_btree_lookup, |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 2251 | .bop_lookup_contig = nilfs_btree_lookup_contig, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2252 | .bop_insert = nilfs_btree_insert, |
| 2253 | .bop_delete = nilfs_btree_delete, |
| 2254 | .bop_clear = NULL, |
| 2255 | |
| 2256 | .bop_propagate = nilfs_btree_propagate, |
| 2257 | |
| 2258 | .bop_lookup_dirty_buffers = nilfs_btree_lookup_dirty_buffers, |
| 2259 | |
| 2260 | .bop_assign = nilfs_btree_assign, |
| 2261 | .bop_mark = nilfs_btree_mark, |
| 2262 | |
| 2263 | .bop_last_key = nilfs_btree_last_key, |
| 2264 | .bop_check_insert = NULL, |
| 2265 | .bop_check_delete = nilfs_btree_check_delete, |
| 2266 | .bop_gather_data = nilfs_btree_gather_data, |
| 2267 | }; |
| 2268 | |
| 2269 | static const struct nilfs_bmap_operations nilfs_btree_ops_gc = { |
| 2270 | .bop_lookup = NULL, |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 2271 | .bop_lookup_contig = NULL, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2272 | .bop_insert = NULL, |
| 2273 | .bop_delete = NULL, |
| 2274 | .bop_clear = NULL, |
| 2275 | |
| 2276 | .bop_propagate = nilfs_btree_propagate_gc, |
| 2277 | |
| 2278 | .bop_lookup_dirty_buffers = nilfs_btree_lookup_dirty_buffers, |
| 2279 | |
| 2280 | .bop_assign = nilfs_btree_assign_gc, |
| 2281 | .bop_mark = NULL, |
| 2282 | |
| 2283 | .bop_last_key = NULL, |
| 2284 | .bop_check_insert = NULL, |
| 2285 | .bop_check_delete = NULL, |
| 2286 | .bop_gather_data = NULL, |
| 2287 | }; |
| 2288 | |
Ryusuke Konishi | 3033342 | 2009-05-24 00:09:44 +0900 | [diff] [blame] | 2289 | int nilfs_btree_init(struct nilfs_bmap *bmap) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2290 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2291 | bmap->b_ops = &nilfs_btree_ops; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2292 | return 0; |
| 2293 | } |
| 2294 | |
| 2295 | void nilfs_btree_init_gc(struct nilfs_bmap *bmap) |
| 2296 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2297 | bmap->b_ops = &nilfs_btree_ops_gc; |
| 2298 | } |