Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1 | /* |
| 2 | * btree.c - NILFS B-tree. |
| 3 | * |
| 4 | * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | * |
| 20 | * Written by Koji Sato <koji@osrg.net>. |
| 21 | */ |
| 22 | |
| 23 | #include <linux/slab.h> |
| 24 | #include <linux/string.h> |
| 25 | #include <linux/errno.h> |
| 26 | #include <linux/pagevec.h> |
| 27 | #include "nilfs.h" |
| 28 | #include "page.h" |
| 29 | #include "btnode.h" |
| 30 | #include "btree.h" |
| 31 | #include "alloc.h" |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 32 | #include "dat.h" |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 33 | |
Li Hong | f905440 | 2010-04-02 17:36:34 +0800 | [diff] [blame] | 34 | static struct nilfs_btree_path *nilfs_btree_alloc_path(void) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 35 | { |
Li Hong | f905440 | 2010-04-02 17:36:34 +0800 | [diff] [blame] | 36 | struct nilfs_btree_path *path; |
| 37 | int level = NILFS_BTREE_LEVEL_DATA; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 38 | |
Li Hong | f905440 | 2010-04-02 17:36:34 +0800 | [diff] [blame] | 39 | path = kmem_cache_alloc(nilfs_btree_path_cache, GFP_NOFS); |
| 40 | if (path == NULL) |
| 41 | goto out; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 42 | |
Li Hong | f905440 | 2010-04-02 17:36:34 +0800 | [diff] [blame] | 43 | for (; level < NILFS_BTREE_LEVEL_MAX; level++) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 44 | path[level].bp_bh = NULL; |
| 45 | path[level].bp_sib_bh = NULL; |
| 46 | path[level].bp_index = 0; |
| 47 | path[level].bp_oldreq.bpr_ptr = NILFS_BMAP_INVALID_PTR; |
| 48 | path[level].bp_newreq.bpr_ptr = NILFS_BMAP_INVALID_PTR; |
| 49 | path[level].bp_op = NULL; |
| 50 | } |
Li Hong | f905440 | 2010-04-02 17:36:34 +0800 | [diff] [blame] | 51 | |
| 52 | out: |
| 53 | return path; |
| 54 | } |
| 55 | |
Li Hong | 73bb488 | 2010-04-02 18:35:00 +0800 | [diff] [blame] | 56 | static void nilfs_btree_free_path(struct nilfs_btree_path *path) |
Li Hong | f905440 | 2010-04-02 17:36:34 +0800 | [diff] [blame] | 57 | { |
Li Hong | 73bb488 | 2010-04-02 18:35:00 +0800 | [diff] [blame] | 58 | int level = NILFS_BTREE_LEVEL_DATA; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 59 | |
Li Hong | 73bb488 | 2010-04-02 18:35:00 +0800 | [diff] [blame] | 60 | for (; level < NILFS_BTREE_LEVEL_MAX; level++) |
Ryusuke Konishi | 3218929 | 2009-08-15 01:54:59 +0900 | [diff] [blame] | 61 | brelse(path[level].bp_bh); |
Li Hong | 73bb488 | 2010-04-02 18:35:00 +0800 | [diff] [blame] | 62 | |
| 63 | kmem_cache_free(nilfs_btree_path_cache, path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 64 | } |
| 65 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 66 | /* |
| 67 | * B-tree node operations |
| 68 | */ |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 69 | static int nilfs_btree_get_block(const struct nilfs_bmap *btree, __u64 ptr, |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 70 | struct buffer_head **bhp) |
| 71 | { |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 72 | struct address_space *btnc = &NILFS_BMAP_I(btree)->i_btnode_cache; |
Ryusuke Konishi | 1d5385b | 2010-07-16 23:52:40 +0900 | [diff] [blame] | 73 | struct buffer_head *bh; |
Ryusuke Konishi | 1376e93 | 2009-11-13 16:49:09 +0900 | [diff] [blame] | 74 | int err; |
| 75 | |
| 76 | err = nilfs_btnode_submit_block(btnc, ptr, 0, bhp); |
| 77 | if (err) |
| 78 | return err == -EEXIST ? 0 : err; |
| 79 | |
Ryusuke Konishi | 1d5385b | 2010-07-16 23:52:40 +0900 | [diff] [blame] | 80 | bh = *bhp; |
| 81 | wait_on_buffer(bh); |
| 82 | if (!buffer_uptodate(bh)) { |
| 83 | brelse(bh); |
Ryusuke Konishi | 1376e93 | 2009-11-13 16:49:09 +0900 | [diff] [blame] | 84 | return -EIO; |
| 85 | } |
Ryusuke Konishi | 1d5385b | 2010-07-16 23:52:40 +0900 | [diff] [blame] | 86 | if (nilfs_btree_broken_node_block(bh)) { |
| 87 | clear_buffer_uptodate(bh); |
| 88 | brelse(bh); |
| 89 | return -EINVAL; |
| 90 | } |
Ryusuke Konishi | 1376e93 | 2009-11-13 16:49:09 +0900 | [diff] [blame] | 91 | return 0; |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 92 | } |
| 93 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 94 | static int nilfs_btree_get_new_block(const struct nilfs_bmap *btree, |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 95 | __u64 ptr, struct buffer_head **bhp) |
| 96 | { |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 97 | struct address_space *btnc = &NILFS_BMAP_I(btree)->i_btnode_cache; |
Ryusuke Konishi | 45f4910 | 2009-11-13 16:25:19 +0900 | [diff] [blame] | 98 | struct buffer_head *bh; |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 99 | |
Ryusuke Konishi | 45f4910 | 2009-11-13 16:25:19 +0900 | [diff] [blame] | 100 | bh = nilfs_btnode_create_block(btnc, ptr); |
| 101 | if (!bh) |
| 102 | return -ENOMEM; |
| 103 | |
| 104 | set_buffer_nilfs_volatile(bh); |
| 105 | *bhp = bh; |
| 106 | return 0; |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 107 | } |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 108 | |
| 109 | static inline int |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 110 | nilfs_btree_node_get_flags(const struct nilfs_btree_node *node) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 111 | { |
| 112 | return node->bn_flags; |
| 113 | } |
| 114 | |
| 115 | static inline void |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 116 | nilfs_btree_node_set_flags(struct nilfs_btree_node *node, int flags) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 117 | { |
| 118 | node->bn_flags = flags; |
| 119 | } |
| 120 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 121 | static inline int nilfs_btree_node_root(const struct nilfs_btree_node *node) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 122 | { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 123 | return nilfs_btree_node_get_flags(node) & NILFS_BTREE_NODE_ROOT; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 124 | } |
| 125 | |
| 126 | static inline int |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 127 | nilfs_btree_node_get_level(const struct nilfs_btree_node *node) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 128 | { |
| 129 | return node->bn_level; |
| 130 | } |
| 131 | |
| 132 | static inline void |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 133 | nilfs_btree_node_set_level(struct nilfs_btree_node *node, int level) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 134 | { |
| 135 | node->bn_level = level; |
| 136 | } |
| 137 | |
| 138 | static inline int |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 139 | nilfs_btree_node_get_nchildren(const struct nilfs_btree_node *node) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 140 | { |
| 141 | return le16_to_cpu(node->bn_nchildren); |
| 142 | } |
| 143 | |
| 144 | static inline void |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 145 | nilfs_btree_node_set_nchildren(struct nilfs_btree_node *node, int nchildren) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 146 | { |
| 147 | node->bn_nchildren = cpu_to_le16(nchildren); |
| 148 | } |
| 149 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 150 | static inline int nilfs_btree_node_size(const struct nilfs_bmap *btree) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 151 | { |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 152 | return 1 << btree->b_inode->i_blkbits; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 153 | } |
| 154 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 155 | static int nilfs_btree_nchildren_per_block(const struct nilfs_bmap *btree) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 156 | { |
Ryusuke Konishi | 5ad2686e9 | 2010-07-13 23:33:54 +0900 | [diff] [blame^] | 157 | return btree->b_nchildren_per_block; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 158 | } |
| 159 | |
| 160 | static inline __le64 * |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 161 | nilfs_btree_node_dkeys(const struct nilfs_btree_node *node) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 162 | { |
| 163 | return (__le64 *)((char *)(node + 1) + |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 164 | (nilfs_btree_node_root(node) ? |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 165 | 0 : NILFS_BTREE_NODE_EXTRA_PAD_SIZE)); |
| 166 | } |
| 167 | |
| 168 | static inline __le64 * |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 169 | nilfs_btree_node_dptrs(const struct nilfs_btree_node *node, int ncmax) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 170 | { |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 171 | return (__le64 *)(nilfs_btree_node_dkeys(node) + ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 172 | } |
| 173 | |
| 174 | static inline __u64 |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 175 | 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] | 176 | { |
Ryusuke Konishi | 25b8d7d | 2010-07-10 16:50:41 +0900 | [diff] [blame] | 177 | return le64_to_cpu(*(nilfs_btree_node_dkeys(node) + index)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 178 | } |
| 179 | |
| 180 | static inline void |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 181 | 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] | 182 | { |
Ryusuke Konishi | 25b8d7d | 2010-07-10 16:50:41 +0900 | [diff] [blame] | 183 | *(nilfs_btree_node_dkeys(node) + index) = cpu_to_le64(key); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 184 | } |
| 185 | |
| 186 | static inline __u64 |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 187 | nilfs_btree_node_get_ptr(const struct nilfs_btree_node *node, int index, |
| 188 | int ncmax) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 189 | { |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 190 | return le64_to_cpu(*(nilfs_btree_node_dptrs(node, ncmax) + index)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 191 | } |
| 192 | |
| 193 | static inline void |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 194 | nilfs_btree_node_set_ptr(struct nilfs_btree_node *node, int index, __u64 ptr, |
| 195 | int ncmax) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 196 | { |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 197 | *(nilfs_btree_node_dptrs(node, ncmax) + index) = cpu_to_le64(ptr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 198 | } |
| 199 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 200 | static void nilfs_btree_node_init(struct nilfs_btree_node *node, int flags, |
| 201 | int level, int nchildren, int ncmax, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 202 | const __u64 *keys, const __u64 *ptrs) |
| 203 | { |
| 204 | __le64 *dkeys; |
| 205 | __le64 *dptrs; |
| 206 | int i; |
| 207 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 208 | nilfs_btree_node_set_flags(node, flags); |
| 209 | nilfs_btree_node_set_level(node, level); |
| 210 | nilfs_btree_node_set_nchildren(node, nchildren); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 211 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 212 | dkeys = nilfs_btree_node_dkeys(node); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 213 | dptrs = nilfs_btree_node_dptrs(node, ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 214 | for (i = 0; i < nchildren; i++) { |
Ryusuke Konishi | 25b8d7d | 2010-07-10 16:50:41 +0900 | [diff] [blame] | 215 | dkeys[i] = cpu_to_le64(keys[i]); |
| 216 | dptrs[i] = cpu_to_le64(ptrs[i]); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 217 | } |
| 218 | } |
| 219 | |
| 220 | /* Assume the buffer heads corresponding to left and right are locked. */ |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 221 | static void nilfs_btree_node_move_left(struct nilfs_btree_node *left, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 222 | struct nilfs_btree_node *right, |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 223 | int n, int lncmax, int rncmax) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 224 | { |
| 225 | __le64 *ldkeys, *rdkeys; |
| 226 | __le64 *ldptrs, *rdptrs; |
| 227 | int lnchildren, rnchildren; |
| 228 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 229 | ldkeys = nilfs_btree_node_dkeys(left); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 230 | ldptrs = nilfs_btree_node_dptrs(left, lncmax); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 231 | lnchildren = nilfs_btree_node_get_nchildren(left); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 232 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 233 | rdkeys = nilfs_btree_node_dkeys(right); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 234 | rdptrs = nilfs_btree_node_dptrs(right, rncmax); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 235 | rnchildren = nilfs_btree_node_get_nchildren(right); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 236 | |
| 237 | memcpy(ldkeys + lnchildren, rdkeys, n * sizeof(*rdkeys)); |
| 238 | memcpy(ldptrs + lnchildren, rdptrs, n * sizeof(*rdptrs)); |
| 239 | memmove(rdkeys, rdkeys + n, (rnchildren - n) * sizeof(*rdkeys)); |
| 240 | memmove(rdptrs, rdptrs + n, (rnchildren - n) * sizeof(*rdptrs)); |
| 241 | |
| 242 | lnchildren += n; |
| 243 | rnchildren -= n; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 244 | nilfs_btree_node_set_nchildren(left, lnchildren); |
| 245 | nilfs_btree_node_set_nchildren(right, rnchildren); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 246 | } |
| 247 | |
| 248 | /* Assume that the buffer heads corresponding to left and right are locked. */ |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 249 | static void nilfs_btree_node_move_right(struct nilfs_btree_node *left, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 250 | struct nilfs_btree_node *right, |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 251 | int n, int lncmax, int rncmax) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 252 | { |
| 253 | __le64 *ldkeys, *rdkeys; |
| 254 | __le64 *ldptrs, *rdptrs; |
| 255 | int lnchildren, rnchildren; |
| 256 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 257 | ldkeys = nilfs_btree_node_dkeys(left); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 258 | ldptrs = nilfs_btree_node_dptrs(left, lncmax); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 259 | lnchildren = nilfs_btree_node_get_nchildren(left); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 260 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 261 | rdkeys = nilfs_btree_node_dkeys(right); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 262 | rdptrs = nilfs_btree_node_dptrs(right, rncmax); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 263 | rnchildren = nilfs_btree_node_get_nchildren(right); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 264 | |
| 265 | memmove(rdkeys + n, rdkeys, rnchildren * sizeof(*rdkeys)); |
| 266 | memmove(rdptrs + n, rdptrs, rnchildren * sizeof(*rdptrs)); |
| 267 | memcpy(rdkeys, ldkeys + lnchildren - n, n * sizeof(*rdkeys)); |
| 268 | memcpy(rdptrs, ldptrs + lnchildren - n, n * sizeof(*rdptrs)); |
| 269 | |
| 270 | lnchildren -= n; |
| 271 | rnchildren += n; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 272 | nilfs_btree_node_set_nchildren(left, lnchildren); |
| 273 | nilfs_btree_node_set_nchildren(right, rnchildren); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 274 | } |
| 275 | |
| 276 | /* Assume that the buffer head corresponding to node is locked. */ |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 277 | static void nilfs_btree_node_insert(struct nilfs_btree_node *node, int index, |
| 278 | __u64 key, __u64 ptr, int ncmax) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 279 | { |
| 280 | __le64 *dkeys; |
| 281 | __le64 *dptrs; |
| 282 | int nchildren; |
| 283 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 284 | dkeys = nilfs_btree_node_dkeys(node); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 285 | dptrs = nilfs_btree_node_dptrs(node, ncmax); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 286 | nchildren = nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 287 | if (index < nchildren) { |
| 288 | memmove(dkeys + index + 1, dkeys + index, |
| 289 | (nchildren - index) * sizeof(*dkeys)); |
| 290 | memmove(dptrs + index + 1, dptrs + index, |
| 291 | (nchildren - index) * sizeof(*dptrs)); |
| 292 | } |
Ryusuke Konishi | 25b8d7d | 2010-07-10 16:50:41 +0900 | [diff] [blame] | 293 | dkeys[index] = cpu_to_le64(key); |
| 294 | dptrs[index] = cpu_to_le64(ptr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 295 | nchildren++; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 296 | nilfs_btree_node_set_nchildren(node, nchildren); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 297 | } |
| 298 | |
| 299 | /* Assume that the buffer head corresponding to node is locked. */ |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 300 | static void nilfs_btree_node_delete(struct nilfs_btree_node *node, int index, |
| 301 | __u64 *keyp, __u64 *ptrp, int ncmax) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 302 | { |
| 303 | __u64 key; |
| 304 | __u64 ptr; |
| 305 | __le64 *dkeys; |
| 306 | __le64 *dptrs; |
| 307 | int nchildren; |
| 308 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 309 | dkeys = nilfs_btree_node_dkeys(node); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 310 | dptrs = nilfs_btree_node_dptrs(node, ncmax); |
Ryusuke Konishi | 25b8d7d | 2010-07-10 16:50:41 +0900 | [diff] [blame] | 311 | key = le64_to_cpu(dkeys[index]); |
| 312 | ptr = le64_to_cpu(dptrs[index]); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 313 | nchildren = nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 314 | if (keyp != NULL) |
| 315 | *keyp = key; |
| 316 | if (ptrp != NULL) |
| 317 | *ptrp = ptr; |
| 318 | |
| 319 | if (index < nchildren - 1) { |
| 320 | memmove(dkeys + index, dkeys + index + 1, |
| 321 | (nchildren - index - 1) * sizeof(*dkeys)); |
| 322 | memmove(dptrs + index, dptrs + index + 1, |
| 323 | (nchildren - index - 1) * sizeof(*dptrs)); |
| 324 | } |
| 325 | nchildren--; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 326 | nilfs_btree_node_set_nchildren(node, nchildren); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 327 | } |
| 328 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 329 | static int nilfs_btree_node_lookup(const struct nilfs_btree_node *node, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 330 | __u64 key, int *indexp) |
| 331 | { |
| 332 | __u64 nkey; |
| 333 | int index, low, high, s; |
| 334 | |
| 335 | /* binary search */ |
| 336 | low = 0; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 337 | high = nilfs_btree_node_get_nchildren(node) - 1; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 338 | index = 0; |
| 339 | s = 0; |
| 340 | while (low <= high) { |
| 341 | index = (low + high) / 2; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 342 | nkey = nilfs_btree_node_get_key(node, index); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 343 | if (nkey == key) { |
| 344 | s = 0; |
| 345 | goto out; |
| 346 | } else if (nkey < key) { |
| 347 | low = index + 1; |
| 348 | s = -1; |
| 349 | } else { |
| 350 | high = index - 1; |
| 351 | s = 1; |
| 352 | } |
| 353 | } |
| 354 | |
| 355 | /* adjust index */ |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 356 | if (nilfs_btree_node_get_level(node) > NILFS_BTREE_LEVEL_NODE_MIN) { |
| 357 | if (s > 0 && index > 0) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 358 | index--; |
| 359 | } else if (s < 0) |
| 360 | index++; |
| 361 | |
| 362 | out: |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 363 | *indexp = index; |
| 364 | |
| 365 | return s == 0; |
| 366 | } |
| 367 | |
Ryusuke Konishi | 1d5385b | 2010-07-16 23:52:40 +0900 | [diff] [blame] | 368 | /** |
| 369 | * nilfs_btree_node_broken - verify consistency of btree node |
| 370 | * @node: btree node block to be examined |
| 371 | * @size: node size (in bytes) |
| 372 | * @blocknr: block number |
| 373 | * |
| 374 | * Return Value: If node is broken, 1 is returned. Otherwise, 0 is returned. |
| 375 | */ |
| 376 | static int nilfs_btree_node_broken(const struct nilfs_btree_node *node, |
| 377 | size_t size, sector_t blocknr) |
| 378 | { |
| 379 | int level, flags, nchildren; |
| 380 | int ret = 0; |
| 381 | |
| 382 | level = nilfs_btree_node_get_level(node); |
| 383 | flags = nilfs_btree_node_get_flags(node); |
| 384 | nchildren = nilfs_btree_node_get_nchildren(node); |
| 385 | |
| 386 | if (unlikely(level < NILFS_BTREE_LEVEL_NODE_MIN || |
| 387 | level >= NILFS_BTREE_LEVEL_MAX || |
| 388 | (flags & NILFS_BTREE_NODE_ROOT) || |
| 389 | nchildren < 0 || |
| 390 | nchildren > NILFS_BTREE_NODE_NCHILDREN_MAX(size))) { |
| 391 | printk(KERN_CRIT "NILFS: bad btree node (blocknr=%llu): " |
| 392 | "level = %d, flags = 0x%x, nchildren = %d\n", |
| 393 | (unsigned long long)blocknr, level, flags, nchildren); |
| 394 | ret = 1; |
| 395 | } |
| 396 | return ret; |
| 397 | } |
| 398 | |
| 399 | int nilfs_btree_broken_node_block(struct buffer_head *bh) |
| 400 | { |
| 401 | return nilfs_btree_node_broken((struct nilfs_btree_node *)bh->b_data, |
| 402 | bh->b_size, bh->b_blocknr); |
| 403 | } |
| 404 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 405 | static inline struct nilfs_btree_node * |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 406 | nilfs_btree_get_root(const struct nilfs_bmap *btree) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 407 | { |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 408 | return (struct nilfs_btree_node *)btree->b_u.u_data; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 409 | } |
| 410 | |
| 411 | static inline struct nilfs_btree_node * |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 412 | 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] | 413 | { |
| 414 | return (struct nilfs_btree_node *)path[level].bp_bh->b_data; |
| 415 | } |
| 416 | |
| 417 | static inline struct nilfs_btree_node * |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 418 | 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] | 419 | { |
| 420 | return (struct nilfs_btree_node *)path[level].bp_sib_bh->b_data; |
| 421 | } |
| 422 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 423 | static inline int nilfs_btree_height(const struct nilfs_bmap *btree) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 424 | { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 425 | return nilfs_btree_node_get_level(nilfs_btree_get_root(btree)) + 1; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 426 | } |
| 427 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 428 | static struct nilfs_btree_node * |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 429 | nilfs_btree_get_node(const struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 430 | const struct nilfs_btree_path *path, |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 431 | int level, int *ncmaxp) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 432 | { |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 433 | struct nilfs_btree_node *node; |
| 434 | |
| 435 | if (level == nilfs_btree_height(btree) - 1) { |
| 436 | node = nilfs_btree_get_root(btree); |
| 437 | *ncmaxp = NILFS_BTREE_ROOT_NCHILDREN_MAX; |
| 438 | } else { |
| 439 | node = nilfs_btree_get_nonroot_node(path, level); |
| 440 | *ncmaxp = nilfs_btree_nchildren_per_block(btree); |
| 441 | } |
| 442 | return node; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 443 | } |
| 444 | |
Ryusuke Konishi | 9b945d5 | 2009-10-10 22:58:10 +0900 | [diff] [blame] | 445 | static inline int |
| 446 | nilfs_btree_bad_node(struct nilfs_btree_node *node, int level) |
| 447 | { |
| 448 | if (unlikely(nilfs_btree_node_get_level(node) != level)) { |
| 449 | dump_stack(); |
| 450 | printk(KERN_CRIT "NILFS: btree level mismatch: %d != %d\n", |
| 451 | nilfs_btree_node_get_level(node), level); |
| 452 | return 1; |
| 453 | } |
| 454 | return 0; |
| 455 | } |
| 456 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 457 | static int nilfs_btree_do_lookup(const struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 458 | struct nilfs_btree_path *path, |
| 459 | __u64 key, __u64 *ptrp, int minlevel) |
| 460 | { |
| 461 | struct nilfs_btree_node *node; |
| 462 | __u64 ptr; |
Ryusuke Konishi | ea64ab8 | 2010-07-13 23:33:52 +0900 | [diff] [blame] | 463 | int level, index, found, ncmax, ret; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 464 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 465 | node = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 466 | level = nilfs_btree_node_get_level(node); |
| 467 | if (level < minlevel || nilfs_btree_node_get_nchildren(node) <= 0) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 468 | return -ENOENT; |
| 469 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 470 | found = nilfs_btree_node_lookup(node, key, &index); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 471 | ptr = nilfs_btree_node_get_ptr(node, index, |
| 472 | NILFS_BTREE_ROOT_NCHILDREN_MAX); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 473 | path[level].bp_bh = NULL; |
| 474 | path[level].bp_index = index; |
| 475 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 476 | ncmax = nilfs_btree_nchildren_per_block(btree); |
Ryusuke Konishi | ea64ab8 | 2010-07-13 23:33:52 +0900 | [diff] [blame] | 477 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 478 | for (level--; level >= minlevel; level--) { |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 479 | ret = nilfs_btree_get_block(btree, ptr, &path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 480 | if (ret < 0) |
| 481 | return ret; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 482 | node = nilfs_btree_get_nonroot_node(path, level); |
Ryusuke Konishi | 9b945d5 | 2009-10-10 22:58:10 +0900 | [diff] [blame] | 483 | if (nilfs_btree_bad_node(node, level)) |
| 484 | return -EINVAL; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 485 | if (!found) |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 486 | found = nilfs_btree_node_lookup(node, key, &index); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 487 | else |
| 488 | index = 0; |
Ryusuke Konishi | ea64ab8 | 2010-07-13 23:33:52 +0900 | [diff] [blame] | 489 | if (index < ncmax) { |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 490 | ptr = nilfs_btree_node_get_ptr(node, index, ncmax); |
Ryusuke Konishi | ea64ab8 | 2010-07-13 23:33:52 +0900 | [diff] [blame] | 491 | } else { |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 492 | WARN_ON(found || level != NILFS_BTREE_LEVEL_NODE_MIN); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 493 | /* insert */ |
| 494 | ptr = NILFS_BMAP_INVALID_PTR; |
| 495 | } |
| 496 | path[level].bp_index = index; |
| 497 | } |
| 498 | if (!found) |
| 499 | return -ENOENT; |
| 500 | |
| 501 | if (ptrp != NULL) |
| 502 | *ptrp = ptr; |
| 503 | |
| 504 | return 0; |
| 505 | } |
| 506 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 507 | static int nilfs_btree_do_lookup_last(const struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 508 | struct nilfs_btree_path *path, |
| 509 | __u64 *keyp, __u64 *ptrp) |
| 510 | { |
| 511 | struct nilfs_btree_node *node; |
| 512 | __u64 ptr; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 513 | int index, level, ncmax, ret; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 514 | |
| 515 | node = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 516 | index = nilfs_btree_node_get_nchildren(node) - 1; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 517 | if (index < 0) |
| 518 | return -ENOENT; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 519 | level = nilfs_btree_node_get_level(node); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 520 | ptr = nilfs_btree_node_get_ptr(node, index, |
| 521 | NILFS_BTREE_ROOT_NCHILDREN_MAX); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 522 | path[level].bp_bh = NULL; |
| 523 | path[level].bp_index = index; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 524 | ncmax = nilfs_btree_nchildren_per_block(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 525 | |
| 526 | for (level--; level > 0; level--) { |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 527 | ret = nilfs_btree_get_block(btree, ptr, &path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 528 | if (ret < 0) |
| 529 | return ret; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 530 | node = nilfs_btree_get_nonroot_node(path, level); |
Ryusuke Konishi | 9b945d5 | 2009-10-10 22:58:10 +0900 | [diff] [blame] | 531 | if (nilfs_btree_bad_node(node, level)) |
| 532 | return -EINVAL; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 533 | index = nilfs_btree_node_get_nchildren(node) - 1; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 534 | ptr = nilfs_btree_node_get_ptr(node, index, ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 535 | path[level].bp_index = index; |
| 536 | } |
| 537 | |
| 538 | if (keyp != NULL) |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 539 | *keyp = nilfs_btree_node_get_key(node, index); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 540 | if (ptrp != NULL) |
| 541 | *ptrp = ptr; |
| 542 | |
| 543 | return 0; |
| 544 | } |
| 545 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 546 | static int nilfs_btree_lookup(const struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 547 | __u64 key, int level, __u64 *ptrp) |
| 548 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 549 | struct nilfs_btree_path *path; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 550 | int ret; |
| 551 | |
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; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 555 | |
Ryusuke Konishi | 364ec2d | 2010-07-13 23:33:51 +0900 | [diff] [blame] | 556 | ret = nilfs_btree_do_lookup(btree, path, key, ptrp, level); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 557 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 558 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 559 | |
| 560 | return ret; |
| 561 | } |
| 562 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 563 | static int nilfs_btree_lookup_contig(const struct nilfs_bmap *btree, |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 564 | __u64 key, __u64 *ptrp, unsigned maxblocks) |
| 565 | { |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 566 | struct nilfs_btree_path *path; |
| 567 | struct nilfs_btree_node *node; |
| 568 | struct inode *dat = NULL; |
| 569 | __u64 ptr, ptr2; |
| 570 | sector_t blocknr; |
| 571 | int level = NILFS_BTREE_LEVEL_NODE_MIN; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 572 | int ret, cnt, index, maxlevel, ncmax; |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 573 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 574 | path = nilfs_btree_alloc_path(); |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 575 | if (path == NULL) |
| 576 | return -ENOMEM; |
Li Hong | f905440 | 2010-04-02 17:36:34 +0800 | [diff] [blame] | 577 | |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 578 | ret = nilfs_btree_do_lookup(btree, path, key, &ptr, level); |
| 579 | if (ret < 0) |
| 580 | goto out; |
| 581 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 582 | if (NILFS_BMAP_USE_VBN(btree)) { |
| 583 | dat = nilfs_bmap_get_dat(btree); |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 584 | ret = nilfs_dat_translate(dat, ptr, &blocknr); |
| 585 | if (ret < 0) |
| 586 | goto out; |
| 587 | ptr = blocknr; |
| 588 | } |
| 589 | cnt = 1; |
| 590 | if (cnt == maxblocks) |
| 591 | goto end; |
| 592 | |
| 593 | maxlevel = nilfs_btree_height(btree) - 1; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 594 | node = nilfs_btree_get_node(btree, path, level, &ncmax); |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 595 | index = path[level].bp_index + 1; |
| 596 | for (;;) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 597 | while (index < nilfs_btree_node_get_nchildren(node)) { |
| 598 | if (nilfs_btree_node_get_key(node, index) != |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 599 | key + cnt) |
| 600 | goto end; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 601 | ptr2 = nilfs_btree_node_get_ptr(node, index, ncmax); |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 602 | if (dat) { |
| 603 | ret = nilfs_dat_translate(dat, ptr2, &blocknr); |
| 604 | if (ret < 0) |
| 605 | goto out; |
| 606 | ptr2 = blocknr; |
| 607 | } |
| 608 | if (ptr2 != ptr + cnt || ++cnt == maxblocks) |
| 609 | goto end; |
| 610 | index++; |
| 611 | continue; |
| 612 | } |
| 613 | if (level == maxlevel) |
| 614 | break; |
| 615 | |
| 616 | /* look-up right sibling node */ |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 617 | node = nilfs_btree_get_node(btree, path, level + 1, &ncmax); |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 618 | index = path[level + 1].bp_index + 1; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 619 | if (index >= nilfs_btree_node_get_nchildren(node) || |
| 620 | nilfs_btree_node_get_key(node, index) != key + cnt) |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 621 | break; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 622 | ptr2 = nilfs_btree_node_get_ptr(node, index, ncmax); |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 623 | path[level + 1].bp_index = index; |
| 624 | |
| 625 | brelse(path[level].bp_bh); |
| 626 | path[level].bp_bh = NULL; |
| 627 | ret = nilfs_btree_get_block(btree, ptr2, &path[level].bp_bh); |
| 628 | if (ret < 0) |
| 629 | goto out; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 630 | node = nilfs_btree_get_nonroot_node(path, level); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 631 | ncmax = nilfs_btree_nchildren_per_block(btree); |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 632 | index = 0; |
| 633 | path[level].bp_index = index; |
| 634 | } |
| 635 | end: |
| 636 | *ptrp = ptr; |
| 637 | ret = cnt; |
| 638 | out: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 639 | nilfs_btree_free_path(path); |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 640 | return ret; |
| 641 | } |
| 642 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 643 | static void nilfs_btree_promote_key(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 644 | struct nilfs_btree_path *path, |
| 645 | int level, __u64 key) |
| 646 | { |
| 647 | if (level < nilfs_btree_height(btree) - 1) { |
| 648 | do { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 649 | nilfs_btree_node_set_key( |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 650 | nilfs_btree_get_nonroot_node(path, level), |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 651 | path[level].bp_index, key); |
| 652 | if (!buffer_dirty(path[level].bp_bh)) |
| 653 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 654 | } while ((path[level].bp_index == 0) && |
| 655 | (++level < nilfs_btree_height(btree) - 1)); |
| 656 | } |
| 657 | |
| 658 | /* root */ |
| 659 | if (level == nilfs_btree_height(btree) - 1) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 660 | nilfs_btree_node_set_key(nilfs_btree_get_root(btree), |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 661 | path[level].bp_index, key); |
| 662 | } |
| 663 | } |
| 664 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 665 | static void nilfs_btree_do_insert(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 666 | struct nilfs_btree_path *path, |
| 667 | int level, __u64 *keyp, __u64 *ptrp) |
| 668 | { |
| 669 | struct nilfs_btree_node *node; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 670 | int ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 671 | |
| 672 | if (level < nilfs_btree_height(btree) - 1) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 673 | node = nilfs_btree_get_nonroot_node(path, level); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 674 | ncblk = nilfs_btree_nchildren_per_block(btree); |
| 675 | nilfs_btree_node_insert(node, path[level].bp_index, |
| 676 | *keyp, *ptrp, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 677 | if (!buffer_dirty(path[level].bp_bh)) |
| 678 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 679 | |
| 680 | if (path[level].bp_index == 0) |
| 681 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 682 | nilfs_btree_node_get_key(node, |
| 683 | 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 684 | } else { |
| 685 | node = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 686 | nilfs_btree_node_insert(node, path[level].bp_index, |
| 687 | *keyp, *ptrp, |
| 688 | NILFS_BTREE_ROOT_NCHILDREN_MAX); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 689 | } |
| 690 | } |
| 691 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 692 | static void nilfs_btree_carry_left(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 693 | struct nilfs_btree_path *path, |
| 694 | int level, __u64 *keyp, __u64 *ptrp) |
| 695 | { |
| 696 | struct nilfs_btree_node *node, *left; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 697 | int nchildren, lnchildren, n, move, ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 698 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 699 | node = nilfs_btree_get_nonroot_node(path, level); |
| 700 | left = nilfs_btree_get_sib_node(path, level); |
| 701 | nchildren = nilfs_btree_node_get_nchildren(node); |
| 702 | lnchildren = nilfs_btree_node_get_nchildren(left); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 703 | ncblk = nilfs_btree_nchildren_per_block(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 704 | move = 0; |
| 705 | |
| 706 | n = (nchildren + lnchildren + 1) / 2 - lnchildren; |
| 707 | if (n > path[level].bp_index) { |
| 708 | /* move insert point */ |
| 709 | n--; |
| 710 | move = 1; |
| 711 | } |
| 712 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 713 | nilfs_btree_node_move_left(left, node, n, ncblk, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 714 | |
| 715 | if (!buffer_dirty(path[level].bp_bh)) |
| 716 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 717 | if (!buffer_dirty(path[level].bp_sib_bh)) |
| 718 | nilfs_btnode_mark_dirty(path[level].bp_sib_bh); |
| 719 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 720 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 721 | nilfs_btree_node_get_key(node, 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 722 | |
| 723 | if (move) { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 724 | brelse(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 725 | path[level].bp_bh = path[level].bp_sib_bh; |
| 726 | path[level].bp_sib_bh = NULL; |
| 727 | path[level].bp_index += lnchildren; |
| 728 | path[level + 1].bp_index--; |
| 729 | } else { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 730 | brelse(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 731 | path[level].bp_sib_bh = NULL; |
| 732 | path[level].bp_index -= n; |
| 733 | } |
| 734 | |
| 735 | nilfs_btree_do_insert(btree, path, level, keyp, ptrp); |
| 736 | } |
| 737 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 738 | static void nilfs_btree_carry_right(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 739 | struct nilfs_btree_path *path, |
| 740 | int level, __u64 *keyp, __u64 *ptrp) |
| 741 | { |
| 742 | struct nilfs_btree_node *node, *right; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 743 | int nchildren, rnchildren, n, move, ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 744 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 745 | node = nilfs_btree_get_nonroot_node(path, level); |
| 746 | right = nilfs_btree_get_sib_node(path, level); |
| 747 | nchildren = nilfs_btree_node_get_nchildren(node); |
| 748 | rnchildren = nilfs_btree_node_get_nchildren(right); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 749 | ncblk = nilfs_btree_nchildren_per_block(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 750 | move = 0; |
| 751 | |
| 752 | n = (nchildren + rnchildren + 1) / 2 - rnchildren; |
| 753 | if (n > nchildren - path[level].bp_index) { |
| 754 | /* move insert point */ |
| 755 | n--; |
| 756 | move = 1; |
| 757 | } |
| 758 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 759 | nilfs_btree_node_move_right(node, right, n, ncblk, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 760 | |
| 761 | if (!buffer_dirty(path[level].bp_bh)) |
| 762 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 763 | if (!buffer_dirty(path[level].bp_sib_bh)) |
| 764 | nilfs_btnode_mark_dirty(path[level].bp_sib_bh); |
| 765 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 766 | path[level + 1].bp_index++; |
| 767 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 768 | nilfs_btree_node_get_key(right, 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 769 | path[level + 1].bp_index--; |
| 770 | |
| 771 | if (move) { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 772 | brelse(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 773 | path[level].bp_bh = path[level].bp_sib_bh; |
| 774 | path[level].bp_sib_bh = NULL; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 775 | path[level].bp_index -= nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 776 | path[level + 1].bp_index++; |
| 777 | } else { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 778 | brelse(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 779 | path[level].bp_sib_bh = NULL; |
| 780 | } |
| 781 | |
| 782 | nilfs_btree_do_insert(btree, path, level, keyp, ptrp); |
| 783 | } |
| 784 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 785 | static void nilfs_btree_split(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 786 | struct nilfs_btree_path *path, |
| 787 | int level, __u64 *keyp, __u64 *ptrp) |
| 788 | { |
| 789 | struct nilfs_btree_node *node, *right; |
| 790 | __u64 newkey; |
| 791 | __u64 newptr; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 792 | int nchildren, n, move, ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 793 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 794 | node = nilfs_btree_get_nonroot_node(path, level); |
| 795 | right = nilfs_btree_get_sib_node(path, level); |
| 796 | nchildren = nilfs_btree_node_get_nchildren(node); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 797 | ncblk = nilfs_btree_nchildren_per_block(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 798 | move = 0; |
| 799 | |
| 800 | n = (nchildren + 1) / 2; |
| 801 | if (n > nchildren - path[level].bp_index) { |
| 802 | n--; |
| 803 | move = 1; |
| 804 | } |
| 805 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 806 | nilfs_btree_node_move_right(node, right, n, ncblk, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 807 | |
| 808 | if (!buffer_dirty(path[level].bp_bh)) |
| 809 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 810 | if (!buffer_dirty(path[level].bp_sib_bh)) |
| 811 | nilfs_btnode_mark_dirty(path[level].bp_sib_bh); |
| 812 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 813 | newkey = nilfs_btree_node_get_key(right, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 814 | newptr = path[level].bp_newreq.bpr_ptr; |
| 815 | |
| 816 | if (move) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 817 | path[level].bp_index -= nilfs_btree_node_get_nchildren(node); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 818 | nilfs_btree_node_insert(right, path[level].bp_index, |
| 819 | *keyp, *ptrp, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 820 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 821 | *keyp = nilfs_btree_node_get_key(right, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 822 | *ptrp = path[level].bp_newreq.bpr_ptr; |
| 823 | |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 824 | brelse(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 825 | path[level].bp_bh = path[level].bp_sib_bh; |
| 826 | path[level].bp_sib_bh = NULL; |
| 827 | } else { |
| 828 | nilfs_btree_do_insert(btree, path, level, keyp, ptrp); |
| 829 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 830 | *keyp = nilfs_btree_node_get_key(right, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 831 | *ptrp = path[level].bp_newreq.bpr_ptr; |
| 832 | |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 833 | brelse(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 834 | path[level].bp_sib_bh = NULL; |
| 835 | } |
| 836 | |
| 837 | path[level + 1].bp_index++; |
| 838 | } |
| 839 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 840 | static void nilfs_btree_grow(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 841 | struct nilfs_btree_path *path, |
| 842 | int level, __u64 *keyp, __u64 *ptrp) |
| 843 | { |
| 844 | struct nilfs_btree_node *root, *child; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 845 | int n, ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 846 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 847 | root = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 848 | child = nilfs_btree_get_sib_node(path, level); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 849 | ncblk = nilfs_btree_nchildren_per_block(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 850 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 851 | n = nilfs_btree_node_get_nchildren(root); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 852 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 853 | nilfs_btree_node_move_right(root, child, n, |
| 854 | NILFS_BTREE_ROOT_NCHILDREN_MAX, ncblk); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 855 | nilfs_btree_node_set_level(root, level + 1); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 856 | |
| 857 | if (!buffer_dirty(path[level].bp_sib_bh)) |
| 858 | nilfs_btnode_mark_dirty(path[level].bp_sib_bh); |
| 859 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 860 | path[level].bp_bh = path[level].bp_sib_bh; |
| 861 | path[level].bp_sib_bh = NULL; |
| 862 | |
| 863 | nilfs_btree_do_insert(btree, path, level, keyp, ptrp); |
| 864 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 865 | *keyp = nilfs_btree_node_get_key(child, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 866 | *ptrp = path[level].bp_newreq.bpr_ptr; |
| 867 | } |
| 868 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 869 | static __u64 nilfs_btree_find_near(const struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 870 | const struct nilfs_btree_path *path) |
| 871 | { |
| 872 | struct nilfs_btree_node *node; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 873 | int level, ncmax; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 874 | |
| 875 | if (path == NULL) |
| 876 | return NILFS_BMAP_INVALID_PTR; |
| 877 | |
| 878 | /* left sibling */ |
| 879 | level = NILFS_BTREE_LEVEL_NODE_MIN; |
| 880 | if (path[level].bp_index > 0) { |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 881 | node = nilfs_btree_get_node(btree, path, level, &ncmax); |
| 882 | return nilfs_btree_node_get_ptr(node, |
| 883 | path[level].bp_index - 1, |
| 884 | ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 885 | } |
| 886 | |
| 887 | /* parent */ |
| 888 | level = NILFS_BTREE_LEVEL_NODE_MIN + 1; |
| 889 | if (level <= nilfs_btree_height(btree) - 1) { |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 890 | node = nilfs_btree_get_node(btree, path, level, &ncmax); |
| 891 | return nilfs_btree_node_get_ptr(node, path[level].bp_index, |
| 892 | ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 893 | } |
| 894 | |
| 895 | return NILFS_BMAP_INVALID_PTR; |
| 896 | } |
| 897 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 898 | static __u64 nilfs_btree_find_target_v(const struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 899 | const struct nilfs_btree_path *path, |
| 900 | __u64 key) |
| 901 | { |
| 902 | __u64 ptr; |
| 903 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 904 | ptr = nilfs_bmap_find_target_seq(btree, key); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 905 | if (ptr != NILFS_BMAP_INVALID_PTR) |
| 906 | /* sequential access */ |
| 907 | return ptr; |
| 908 | else { |
| 909 | ptr = nilfs_btree_find_near(btree, path); |
| 910 | if (ptr != NILFS_BMAP_INVALID_PTR) |
| 911 | /* near */ |
| 912 | return ptr; |
| 913 | } |
| 914 | /* block group */ |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 915 | return nilfs_bmap_find_target_in_group(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 916 | } |
| 917 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 918 | static int nilfs_btree_prepare_insert(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 919 | struct nilfs_btree_path *path, |
| 920 | int *levelp, __u64 key, __u64 ptr, |
| 921 | struct nilfs_bmap_stats *stats) |
| 922 | { |
| 923 | struct buffer_head *bh; |
| 924 | struct nilfs_btree_node *node, *parent, *sib; |
| 925 | __u64 sibptr; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 926 | int pindex, level, ncmax, ncblk, ret; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 927 | struct inode *dat = NULL; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 928 | |
| 929 | stats->bs_nblocks = 0; |
| 930 | level = NILFS_BTREE_LEVEL_DATA; |
| 931 | |
| 932 | /* allocate a new ptr for data block */ |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 933 | if (NILFS_BMAP_USE_VBN(btree)) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 934 | path[level].bp_newreq.bpr_ptr = |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 935 | nilfs_btree_find_target_v(btree, path, key); |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 936 | dat = nilfs_bmap_get_dat(btree); |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 937 | } |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 938 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 939 | ret = nilfs_bmap_prepare_alloc_ptr(btree, &path[level].bp_newreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 940 | if (ret < 0) |
| 941 | goto err_out_data; |
| 942 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 943 | ncblk = nilfs_btree_nchildren_per_block(btree); |
Ryusuke Konishi | ea64ab8 | 2010-07-13 23:33:52 +0900 | [diff] [blame] | 944 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 945 | for (level = NILFS_BTREE_LEVEL_NODE_MIN; |
| 946 | level < nilfs_btree_height(btree) - 1; |
| 947 | level++) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 948 | node = nilfs_btree_get_nonroot_node(path, level); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 949 | if (nilfs_btree_node_get_nchildren(node) < ncblk) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 950 | path[level].bp_op = nilfs_btree_do_insert; |
| 951 | stats->bs_nblocks++; |
| 952 | goto out; |
| 953 | } |
| 954 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 955 | parent = nilfs_btree_get_node(btree, path, level + 1, &ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 956 | pindex = path[level + 1].bp_index; |
| 957 | |
| 958 | /* left sibling */ |
| 959 | if (pindex > 0) { |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 960 | sibptr = nilfs_btree_node_get_ptr(parent, pindex - 1, |
| 961 | ncmax); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 962 | ret = nilfs_btree_get_block(btree, sibptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 963 | if (ret < 0) |
| 964 | goto err_out_child_node; |
| 965 | sib = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 966 | if (nilfs_btree_node_get_nchildren(sib) < ncblk) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 967 | path[level].bp_sib_bh = bh; |
| 968 | path[level].bp_op = nilfs_btree_carry_left; |
| 969 | stats->bs_nblocks++; |
| 970 | goto out; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 971 | } else { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 972 | brelse(bh); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 973 | } |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 974 | } |
| 975 | |
| 976 | /* right sibling */ |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 977 | if (pindex < nilfs_btree_node_get_nchildren(parent) - 1) { |
| 978 | sibptr = nilfs_btree_node_get_ptr(parent, pindex + 1, |
| 979 | ncmax); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 980 | ret = nilfs_btree_get_block(btree, sibptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 981 | if (ret < 0) |
| 982 | goto err_out_child_node; |
| 983 | sib = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 984 | if (nilfs_btree_node_get_nchildren(sib) < ncblk) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 985 | path[level].bp_sib_bh = bh; |
| 986 | path[level].bp_op = nilfs_btree_carry_right; |
| 987 | stats->bs_nblocks++; |
| 988 | goto out; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 989 | } else { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 990 | brelse(bh); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 991 | } |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 992 | } |
| 993 | |
| 994 | /* split */ |
| 995 | path[level].bp_newreq.bpr_ptr = |
| 996 | path[level - 1].bp_newreq.bpr_ptr + 1; |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 997 | ret = nilfs_bmap_prepare_alloc_ptr(btree, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 998 | &path[level].bp_newreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 999 | if (ret < 0) |
| 1000 | goto err_out_child_node; |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1001 | ret = nilfs_btree_get_new_block(btree, |
| 1002 | path[level].bp_newreq.bpr_ptr, |
| 1003 | &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1004 | if (ret < 0) |
| 1005 | goto err_out_curr_node; |
| 1006 | |
| 1007 | stats->bs_nblocks++; |
| 1008 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1009 | sib = (struct nilfs_btree_node *)bh->b_data; |
| 1010 | nilfs_btree_node_init(sib, 0, level, 0, ncblk, NULL, NULL); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1011 | path[level].bp_sib_bh = bh; |
| 1012 | path[level].bp_op = nilfs_btree_split; |
| 1013 | } |
| 1014 | |
| 1015 | /* root */ |
| 1016 | node = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1017 | if (nilfs_btree_node_get_nchildren(node) < |
Ryusuke Konishi | ea64ab8 | 2010-07-13 23:33:52 +0900 | [diff] [blame] | 1018 | NILFS_BTREE_ROOT_NCHILDREN_MAX) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1019 | path[level].bp_op = nilfs_btree_do_insert; |
| 1020 | stats->bs_nblocks++; |
| 1021 | goto out; |
| 1022 | } |
| 1023 | |
| 1024 | /* grow */ |
| 1025 | path[level].bp_newreq.bpr_ptr = path[level - 1].bp_newreq.bpr_ptr + 1; |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1026 | ret = nilfs_bmap_prepare_alloc_ptr(btree, &path[level].bp_newreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1027 | if (ret < 0) |
| 1028 | goto err_out_child_node; |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1029 | ret = nilfs_btree_get_new_block(btree, path[level].bp_newreq.bpr_ptr, |
| 1030 | &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1031 | if (ret < 0) |
| 1032 | goto err_out_curr_node; |
| 1033 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1034 | nilfs_btree_node_init((struct nilfs_btree_node *)bh->b_data, |
| 1035 | 0, level, 0, ncblk, NULL, NULL); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1036 | path[level].bp_sib_bh = bh; |
| 1037 | path[level].bp_op = nilfs_btree_grow; |
| 1038 | |
| 1039 | level++; |
| 1040 | path[level].bp_op = nilfs_btree_do_insert; |
| 1041 | |
| 1042 | /* a newly-created node block and a data block are added */ |
| 1043 | stats->bs_nblocks += 2; |
| 1044 | |
| 1045 | /* success */ |
| 1046 | out: |
| 1047 | *levelp = level; |
| 1048 | return ret; |
| 1049 | |
| 1050 | /* error */ |
| 1051 | err_out_curr_node: |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1052 | nilfs_bmap_abort_alloc_ptr(btree, &path[level].bp_newreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1053 | err_out_child_node: |
| 1054 | for (level--; level > NILFS_BTREE_LEVEL_DATA; level--) { |
Ryusuke Konishi | 9f09890 | 2009-05-22 00:38:56 +0900 | [diff] [blame] | 1055 | nilfs_btnode_delete(path[level].bp_sib_bh); |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1056 | nilfs_bmap_abort_alloc_ptr(btree, &path[level].bp_newreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1057 | |
| 1058 | } |
| 1059 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1060 | nilfs_bmap_abort_alloc_ptr(btree, &path[level].bp_newreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1061 | err_out_data: |
| 1062 | *levelp = level; |
| 1063 | stats->bs_nblocks = 0; |
| 1064 | return ret; |
| 1065 | } |
| 1066 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1067 | static void nilfs_btree_commit_insert(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1068 | struct nilfs_btree_path *path, |
| 1069 | int maxlevel, __u64 key, __u64 ptr) |
| 1070 | { |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1071 | struct inode *dat = NULL; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1072 | int level; |
| 1073 | |
| 1074 | set_buffer_nilfs_volatile((struct buffer_head *)((unsigned long)ptr)); |
| 1075 | ptr = path[NILFS_BTREE_LEVEL_DATA].bp_newreq.bpr_ptr; |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1076 | if (NILFS_BMAP_USE_VBN(btree)) { |
Ryusuke Konishi | dc935be | 2010-07-10 22:21:54 +0900 | [diff] [blame] | 1077 | nilfs_bmap_set_target_v(btree, key, ptr); |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1078 | dat = nilfs_bmap_get_dat(btree); |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1079 | } |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1080 | |
| 1081 | for (level = NILFS_BTREE_LEVEL_NODE_MIN; level <= maxlevel; level++) { |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1082 | nilfs_bmap_commit_alloc_ptr(btree, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1083 | &path[level - 1].bp_newreq, dat); |
Pekka Enberg | 8acfbf0 | 2009-04-06 19:01:49 -0700 | [diff] [blame] | 1084 | path[level].bp_op(btree, path, level, &key, &ptr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1085 | } |
| 1086 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1087 | if (!nilfs_bmap_dirty(btree)) |
| 1088 | nilfs_bmap_set_dirty(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1089 | } |
| 1090 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1091 | static int nilfs_btree_insert(struct nilfs_bmap *btree, __u64 key, __u64 ptr) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1092 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1093 | struct nilfs_btree_path *path; |
| 1094 | struct nilfs_bmap_stats stats; |
| 1095 | int level, ret; |
| 1096 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1097 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1098 | if (path == NULL) |
| 1099 | return -ENOMEM; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1100 | |
| 1101 | ret = nilfs_btree_do_lookup(btree, path, key, NULL, |
| 1102 | NILFS_BTREE_LEVEL_NODE_MIN); |
| 1103 | if (ret != -ENOENT) { |
| 1104 | if (ret == 0) |
| 1105 | ret = -EEXIST; |
| 1106 | goto out; |
| 1107 | } |
| 1108 | |
| 1109 | ret = nilfs_btree_prepare_insert(btree, path, &level, key, ptr, &stats); |
| 1110 | if (ret < 0) |
| 1111 | goto out; |
| 1112 | nilfs_btree_commit_insert(btree, path, level, key, ptr); |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1113 | nilfs_bmap_add_blocks(btree, stats.bs_nblocks); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1114 | |
| 1115 | out: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1116 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1117 | return ret; |
| 1118 | } |
| 1119 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1120 | static void nilfs_btree_do_delete(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1121 | struct nilfs_btree_path *path, |
| 1122 | int level, __u64 *keyp, __u64 *ptrp) |
| 1123 | { |
| 1124 | struct nilfs_btree_node *node; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1125 | int ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1126 | |
| 1127 | if (level < nilfs_btree_height(btree) - 1) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1128 | node = nilfs_btree_get_nonroot_node(path, level); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1129 | ncblk = nilfs_btree_nchildren_per_block(btree); |
| 1130 | nilfs_btree_node_delete(node, path[level].bp_index, |
| 1131 | keyp, ptrp, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1132 | if (!buffer_dirty(path[level].bp_bh)) |
| 1133 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1134 | if (path[level].bp_index == 0) |
| 1135 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1136 | nilfs_btree_node_get_key(node, 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1137 | } else { |
| 1138 | node = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1139 | nilfs_btree_node_delete(node, path[level].bp_index, |
| 1140 | keyp, ptrp, |
| 1141 | NILFS_BTREE_ROOT_NCHILDREN_MAX); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1142 | } |
| 1143 | } |
| 1144 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1145 | static void nilfs_btree_borrow_left(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1146 | struct nilfs_btree_path *path, |
| 1147 | int level, __u64 *keyp, __u64 *ptrp) |
| 1148 | { |
| 1149 | struct nilfs_btree_node *node, *left; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1150 | int nchildren, lnchildren, n, ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1151 | |
| 1152 | nilfs_btree_do_delete(btree, path, level, keyp, ptrp); |
| 1153 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1154 | node = nilfs_btree_get_nonroot_node(path, level); |
| 1155 | left = nilfs_btree_get_sib_node(path, level); |
| 1156 | nchildren = nilfs_btree_node_get_nchildren(node); |
| 1157 | lnchildren = nilfs_btree_node_get_nchildren(left); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1158 | ncblk = nilfs_btree_nchildren_per_block(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1159 | |
| 1160 | n = (nchildren + lnchildren) / 2 - nchildren; |
| 1161 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1162 | nilfs_btree_node_move_right(left, node, n, ncblk, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1163 | |
| 1164 | if (!buffer_dirty(path[level].bp_bh)) |
| 1165 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 1166 | if (!buffer_dirty(path[level].bp_sib_bh)) |
| 1167 | nilfs_btnode_mark_dirty(path[level].bp_sib_bh); |
| 1168 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1169 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1170 | nilfs_btree_node_get_key(node, 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1171 | |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1172 | brelse(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1173 | path[level].bp_sib_bh = NULL; |
| 1174 | path[level].bp_index += n; |
| 1175 | } |
| 1176 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1177 | static void nilfs_btree_borrow_right(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1178 | struct nilfs_btree_path *path, |
| 1179 | int level, __u64 *keyp, __u64 *ptrp) |
| 1180 | { |
| 1181 | struct nilfs_btree_node *node, *right; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1182 | int nchildren, rnchildren, n, ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1183 | |
| 1184 | nilfs_btree_do_delete(btree, path, level, keyp, ptrp); |
| 1185 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1186 | node = nilfs_btree_get_nonroot_node(path, level); |
| 1187 | right = nilfs_btree_get_sib_node(path, level); |
| 1188 | nchildren = nilfs_btree_node_get_nchildren(node); |
| 1189 | rnchildren = nilfs_btree_node_get_nchildren(right); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1190 | ncblk = nilfs_btree_nchildren_per_block(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1191 | |
| 1192 | n = (nchildren + rnchildren) / 2 - nchildren; |
| 1193 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1194 | nilfs_btree_node_move_left(node, right, n, ncblk, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1195 | |
| 1196 | if (!buffer_dirty(path[level].bp_bh)) |
| 1197 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 1198 | if (!buffer_dirty(path[level].bp_sib_bh)) |
| 1199 | nilfs_btnode_mark_dirty(path[level].bp_sib_bh); |
| 1200 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1201 | path[level + 1].bp_index++; |
| 1202 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1203 | nilfs_btree_node_get_key(right, 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1204 | path[level + 1].bp_index--; |
| 1205 | |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1206 | brelse(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1207 | path[level].bp_sib_bh = NULL; |
| 1208 | } |
| 1209 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1210 | static void nilfs_btree_concat_left(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1211 | struct nilfs_btree_path *path, |
| 1212 | int level, __u64 *keyp, __u64 *ptrp) |
| 1213 | { |
| 1214 | struct nilfs_btree_node *node, *left; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1215 | int n, ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1216 | |
| 1217 | nilfs_btree_do_delete(btree, path, level, keyp, ptrp); |
| 1218 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1219 | node = nilfs_btree_get_nonroot_node(path, level); |
| 1220 | left = nilfs_btree_get_sib_node(path, level); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1221 | ncblk = nilfs_btree_nchildren_per_block(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1222 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1223 | n = nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1224 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1225 | nilfs_btree_node_move_left(left, node, n, ncblk, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1226 | |
| 1227 | if (!buffer_dirty(path[level].bp_sib_bh)) |
| 1228 | nilfs_btnode_mark_dirty(path[level].bp_sib_bh); |
| 1229 | |
Ryusuke Konishi | 9f09890 | 2009-05-22 00:38:56 +0900 | [diff] [blame] | 1230 | nilfs_btnode_delete(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1231 | path[level].bp_bh = path[level].bp_sib_bh; |
| 1232 | path[level].bp_sib_bh = NULL; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1233 | path[level].bp_index += nilfs_btree_node_get_nchildren(left); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1234 | } |
| 1235 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1236 | static void nilfs_btree_concat_right(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1237 | struct nilfs_btree_path *path, |
| 1238 | int level, __u64 *keyp, __u64 *ptrp) |
| 1239 | { |
| 1240 | struct nilfs_btree_node *node, *right; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1241 | int n, ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1242 | |
| 1243 | nilfs_btree_do_delete(btree, path, level, keyp, ptrp); |
| 1244 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1245 | node = nilfs_btree_get_nonroot_node(path, level); |
| 1246 | right = nilfs_btree_get_sib_node(path, level); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1247 | ncblk = nilfs_btree_nchildren_per_block(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1248 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1249 | n = nilfs_btree_node_get_nchildren(right); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1250 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1251 | nilfs_btree_node_move_left(node, right, n, ncblk, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1252 | |
| 1253 | if (!buffer_dirty(path[level].bp_bh)) |
| 1254 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 1255 | |
Ryusuke Konishi | 9f09890 | 2009-05-22 00:38:56 +0900 | [diff] [blame] | 1256 | nilfs_btnode_delete(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1257 | path[level].bp_sib_bh = NULL; |
| 1258 | path[level + 1].bp_index++; |
| 1259 | } |
| 1260 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1261 | static void nilfs_btree_shrink(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1262 | struct nilfs_btree_path *path, |
| 1263 | int level, __u64 *keyp, __u64 *ptrp) |
| 1264 | { |
| 1265 | struct nilfs_btree_node *root, *child; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1266 | int n, ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1267 | |
| 1268 | nilfs_btree_do_delete(btree, path, level, keyp, ptrp); |
| 1269 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1270 | root = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1271 | child = nilfs_btree_get_nonroot_node(path, level); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1272 | ncblk = nilfs_btree_nchildren_per_block(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1273 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1274 | nilfs_btree_node_delete(root, 0, NULL, NULL, |
| 1275 | NILFS_BTREE_ROOT_NCHILDREN_MAX); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1276 | nilfs_btree_node_set_level(root, level); |
| 1277 | n = nilfs_btree_node_get_nchildren(child); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1278 | nilfs_btree_node_move_left(root, child, n, |
| 1279 | NILFS_BTREE_ROOT_NCHILDREN_MAX, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1280 | |
Ryusuke Konishi | 9f09890 | 2009-05-22 00:38:56 +0900 | [diff] [blame] | 1281 | nilfs_btnode_delete(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1282 | path[level].bp_bh = NULL; |
| 1283 | } |
| 1284 | |
| 1285 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1286 | static int nilfs_btree_prepare_delete(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1287 | struct nilfs_btree_path *path, |
| 1288 | int *levelp, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1289 | struct nilfs_bmap_stats *stats, |
| 1290 | struct inode *dat) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1291 | { |
| 1292 | struct buffer_head *bh; |
| 1293 | struct nilfs_btree_node *node, *parent, *sib; |
| 1294 | __u64 sibptr; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1295 | int pindex, level, ncmin, ncmax, ncblk, ret; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1296 | |
| 1297 | ret = 0; |
| 1298 | stats->bs_nblocks = 0; |
Ryusuke Konishi | ea64ab8 | 2010-07-13 23:33:52 +0900 | [diff] [blame] | 1299 | ncmin = NILFS_BTREE_NODE_NCHILDREN_MIN(nilfs_btree_node_size(btree)); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1300 | ncblk = nilfs_btree_nchildren_per_block(btree); |
Ryusuke Konishi | ea64ab8 | 2010-07-13 23:33:52 +0900 | [diff] [blame] | 1301 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1302 | for (level = NILFS_BTREE_LEVEL_NODE_MIN; |
| 1303 | level < nilfs_btree_height(btree) - 1; |
| 1304 | level++) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1305 | node = nilfs_btree_get_nonroot_node(path, level); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1306 | path[level].bp_oldreq.bpr_ptr = |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1307 | nilfs_btree_node_get_ptr(node, path[level].bp_index, |
| 1308 | ncblk); |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1309 | ret = nilfs_bmap_prepare_end_ptr(btree, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1310 | &path[level].bp_oldreq, dat); |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1311 | if (ret < 0) |
| 1312 | goto err_out_child_node; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1313 | |
Ryusuke Konishi | ea64ab8 | 2010-07-13 23:33:52 +0900 | [diff] [blame] | 1314 | if (nilfs_btree_node_get_nchildren(node) > ncmin) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1315 | path[level].bp_op = nilfs_btree_do_delete; |
| 1316 | stats->bs_nblocks++; |
| 1317 | goto out; |
| 1318 | } |
| 1319 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1320 | parent = nilfs_btree_get_node(btree, path, level + 1, &ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1321 | pindex = path[level + 1].bp_index; |
| 1322 | |
| 1323 | if (pindex > 0) { |
| 1324 | /* left sibling */ |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1325 | sibptr = nilfs_btree_node_get_ptr(parent, pindex - 1, |
| 1326 | ncmax); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1327 | ret = nilfs_btree_get_block(btree, sibptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1328 | if (ret < 0) |
| 1329 | goto err_out_curr_node; |
| 1330 | sib = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | ea64ab8 | 2010-07-13 23:33:52 +0900 | [diff] [blame] | 1331 | if (nilfs_btree_node_get_nchildren(sib) > ncmin) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1332 | path[level].bp_sib_bh = bh; |
| 1333 | path[level].bp_op = nilfs_btree_borrow_left; |
| 1334 | stats->bs_nblocks++; |
| 1335 | goto out; |
| 1336 | } else { |
| 1337 | path[level].bp_sib_bh = bh; |
| 1338 | path[level].bp_op = nilfs_btree_concat_left; |
| 1339 | stats->bs_nblocks++; |
| 1340 | /* continue; */ |
| 1341 | } |
| 1342 | } else if (pindex < |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1343 | nilfs_btree_node_get_nchildren(parent) - 1) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1344 | /* right sibling */ |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1345 | sibptr = nilfs_btree_node_get_ptr(parent, pindex + 1, |
| 1346 | ncmax); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1347 | ret = nilfs_btree_get_block(btree, sibptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1348 | if (ret < 0) |
| 1349 | goto err_out_curr_node; |
| 1350 | sib = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | ea64ab8 | 2010-07-13 23:33:52 +0900 | [diff] [blame] | 1351 | if (nilfs_btree_node_get_nchildren(sib) > ncmin) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1352 | path[level].bp_sib_bh = bh; |
| 1353 | path[level].bp_op = nilfs_btree_borrow_right; |
| 1354 | stats->bs_nblocks++; |
| 1355 | goto out; |
| 1356 | } else { |
| 1357 | path[level].bp_sib_bh = bh; |
| 1358 | path[level].bp_op = nilfs_btree_concat_right; |
| 1359 | stats->bs_nblocks++; |
| 1360 | /* continue; */ |
| 1361 | } |
| 1362 | } else { |
| 1363 | /* no siblings */ |
| 1364 | /* the only child of the root node */ |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1365 | WARN_ON(level != nilfs_btree_height(btree) - 2); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1366 | if (nilfs_btree_node_get_nchildren(node) - 1 <= |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1367 | NILFS_BTREE_ROOT_NCHILDREN_MAX) { |
| 1368 | path[level].bp_op = nilfs_btree_shrink; |
| 1369 | stats->bs_nblocks += 2; |
| 1370 | } else { |
| 1371 | path[level].bp_op = nilfs_btree_do_delete; |
| 1372 | stats->bs_nblocks++; |
| 1373 | } |
| 1374 | |
| 1375 | goto out; |
| 1376 | |
| 1377 | } |
| 1378 | } |
| 1379 | |
| 1380 | node = nilfs_btree_get_root(btree); |
| 1381 | path[level].bp_oldreq.bpr_ptr = |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1382 | nilfs_btree_node_get_ptr(node, path[level].bp_index, |
| 1383 | NILFS_BTREE_ROOT_NCHILDREN_MAX); |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1384 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1385 | ret = nilfs_bmap_prepare_end_ptr(btree, &path[level].bp_oldreq, dat); |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1386 | if (ret < 0) |
| 1387 | goto err_out_child_node; |
| 1388 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1389 | /* child of the root node is deleted */ |
| 1390 | path[level].bp_op = nilfs_btree_do_delete; |
| 1391 | stats->bs_nblocks++; |
| 1392 | |
| 1393 | /* success */ |
| 1394 | out: |
| 1395 | *levelp = level; |
| 1396 | return ret; |
| 1397 | |
| 1398 | /* error */ |
| 1399 | err_out_curr_node: |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1400 | nilfs_bmap_abort_end_ptr(btree, &path[level].bp_oldreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1401 | err_out_child_node: |
| 1402 | for (level--; level >= NILFS_BTREE_LEVEL_NODE_MIN; level--) { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1403 | brelse(path[level].bp_sib_bh); |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1404 | nilfs_bmap_abort_end_ptr(btree, &path[level].bp_oldreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1405 | } |
| 1406 | *levelp = level; |
| 1407 | stats->bs_nblocks = 0; |
| 1408 | return ret; |
| 1409 | } |
| 1410 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1411 | static void nilfs_btree_commit_delete(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1412 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1413 | int maxlevel, struct inode *dat) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1414 | { |
| 1415 | int level; |
| 1416 | |
| 1417 | for (level = NILFS_BTREE_LEVEL_NODE_MIN; level <= maxlevel; level++) { |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1418 | nilfs_bmap_commit_end_ptr(btree, &path[level].bp_oldreq, dat); |
Pekka Enberg | 8acfbf0 | 2009-04-06 19:01:49 -0700 | [diff] [blame] | 1419 | path[level].bp_op(btree, path, level, NULL, NULL); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1420 | } |
| 1421 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1422 | if (!nilfs_bmap_dirty(btree)) |
| 1423 | nilfs_bmap_set_dirty(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1424 | } |
| 1425 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1426 | static int nilfs_btree_delete(struct nilfs_bmap *btree, __u64 key) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1427 | |
| 1428 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1429 | struct nilfs_btree_path *path; |
| 1430 | struct nilfs_bmap_stats stats; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1431 | struct inode *dat; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1432 | int level, ret; |
| 1433 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1434 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1435 | if (path == NULL) |
| 1436 | return -ENOMEM; |
Li Hong | f905440 | 2010-04-02 17:36:34 +0800 | [diff] [blame] | 1437 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1438 | ret = nilfs_btree_do_lookup(btree, path, key, NULL, |
| 1439 | NILFS_BTREE_LEVEL_NODE_MIN); |
| 1440 | if (ret < 0) |
| 1441 | goto out; |
| 1442 | |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1443 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1444 | dat = NILFS_BMAP_USE_VBN(btree) ? nilfs_bmap_get_dat(btree) : NULL; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1445 | |
| 1446 | ret = nilfs_btree_prepare_delete(btree, path, &level, &stats, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1447 | if (ret < 0) |
| 1448 | goto out; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1449 | nilfs_btree_commit_delete(btree, path, level, dat); |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1450 | nilfs_bmap_sub_blocks(btree, stats.bs_nblocks); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1451 | |
| 1452 | out: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1453 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1454 | return ret; |
| 1455 | } |
| 1456 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1457 | static int nilfs_btree_last_key(const struct nilfs_bmap *btree, __u64 *keyp) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1458 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1459 | struct nilfs_btree_path *path; |
| 1460 | int ret; |
| 1461 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1462 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1463 | if (path == NULL) |
| 1464 | return -ENOMEM; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1465 | |
| 1466 | ret = nilfs_btree_do_lookup_last(btree, path, keyp, NULL); |
| 1467 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1468 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1469 | |
| 1470 | return ret; |
| 1471 | } |
| 1472 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1473 | static int nilfs_btree_check_delete(struct nilfs_bmap *btree, __u64 key) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1474 | { |
| 1475 | struct buffer_head *bh; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1476 | struct nilfs_btree_node *root, *node; |
| 1477 | __u64 maxkey, nextmaxkey; |
| 1478 | __u64 ptr; |
| 1479 | int nchildren, ret; |
| 1480 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1481 | root = nilfs_btree_get_root(btree); |
| 1482 | switch (nilfs_btree_height(btree)) { |
| 1483 | case 2: |
| 1484 | bh = NULL; |
| 1485 | node = root; |
| 1486 | break; |
| 1487 | case 3: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1488 | nchildren = nilfs_btree_node_get_nchildren(root); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1489 | if (nchildren > 1) |
| 1490 | return 0; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1491 | ptr = nilfs_btree_node_get_ptr(root, nchildren - 1, |
| 1492 | NILFS_BTREE_ROOT_NCHILDREN_MAX); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1493 | ret = nilfs_btree_get_block(btree, ptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1494 | if (ret < 0) |
| 1495 | return ret; |
| 1496 | node = (struct nilfs_btree_node *)bh->b_data; |
| 1497 | break; |
| 1498 | default: |
| 1499 | return 0; |
| 1500 | } |
| 1501 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1502 | nchildren = nilfs_btree_node_get_nchildren(node); |
| 1503 | maxkey = nilfs_btree_node_get_key(node, nchildren - 1); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1504 | nextmaxkey = (nchildren > 1) ? |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1505 | nilfs_btree_node_get_key(node, nchildren - 2) : 0; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1506 | if (bh != NULL) |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1507 | brelse(bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1508 | |
Ryusuke Konishi | 3033342 | 2009-05-24 00:09:44 +0900 | [diff] [blame] | 1509 | return (maxkey == key) && (nextmaxkey < NILFS_BMAP_LARGE_LOW); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1510 | } |
| 1511 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1512 | static int nilfs_btree_gather_data(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1513 | __u64 *keys, __u64 *ptrs, int nitems) |
| 1514 | { |
| 1515 | struct buffer_head *bh; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1516 | struct nilfs_btree_node *node, *root; |
| 1517 | __le64 *dkeys; |
| 1518 | __le64 *dptrs; |
| 1519 | __u64 ptr; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1520 | int nchildren, ncmax, i, ret; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1521 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1522 | root = nilfs_btree_get_root(btree); |
| 1523 | switch (nilfs_btree_height(btree)) { |
| 1524 | case 2: |
| 1525 | bh = NULL; |
| 1526 | node = root; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1527 | ncmax = NILFS_BTREE_ROOT_NCHILDREN_MAX; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1528 | break; |
| 1529 | case 3: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1530 | nchildren = nilfs_btree_node_get_nchildren(root); |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1531 | WARN_ON(nchildren > 1); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1532 | ptr = nilfs_btree_node_get_ptr(root, nchildren - 1, |
| 1533 | NILFS_BTREE_ROOT_NCHILDREN_MAX); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1534 | ret = nilfs_btree_get_block(btree, ptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1535 | if (ret < 0) |
| 1536 | return ret; |
| 1537 | node = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1538 | ncmax = nilfs_btree_nchildren_per_block(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1539 | break; |
| 1540 | default: |
| 1541 | node = NULL; |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1542 | return -EINVAL; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1543 | } |
| 1544 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1545 | nchildren = nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1546 | if (nchildren < nitems) |
| 1547 | nitems = nchildren; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1548 | dkeys = nilfs_btree_node_dkeys(node); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1549 | dptrs = nilfs_btree_node_dptrs(node, ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1550 | for (i = 0; i < nitems; i++) { |
Ryusuke Konishi | 25b8d7d | 2010-07-10 16:50:41 +0900 | [diff] [blame] | 1551 | keys[i] = le64_to_cpu(dkeys[i]); |
| 1552 | ptrs[i] = le64_to_cpu(dptrs[i]); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1553 | } |
| 1554 | |
| 1555 | if (bh != NULL) |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1556 | brelse(bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1557 | |
| 1558 | return nitems; |
| 1559 | } |
| 1560 | |
| 1561 | static int |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1562 | nilfs_btree_prepare_convert_and_insert(struct nilfs_bmap *btree, __u64 key, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1563 | union nilfs_bmap_ptr_req *dreq, |
| 1564 | union nilfs_bmap_ptr_req *nreq, |
| 1565 | struct buffer_head **bhp, |
| 1566 | struct nilfs_bmap_stats *stats) |
| 1567 | { |
| 1568 | struct buffer_head *bh; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1569 | struct inode *dat = NULL; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1570 | int ret; |
| 1571 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1572 | stats->bs_nblocks = 0; |
| 1573 | |
| 1574 | /* for data */ |
| 1575 | /* cannot find near ptr */ |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1576 | if (NILFS_BMAP_USE_VBN(btree)) { |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 1577 | dreq->bpr_ptr = nilfs_btree_find_target_v(btree, NULL, key); |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1578 | dat = nilfs_bmap_get_dat(btree); |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1579 | } |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 1580 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1581 | ret = nilfs_bmap_prepare_alloc_ptr(btree, dreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1582 | if (ret < 0) |
| 1583 | return ret; |
| 1584 | |
| 1585 | *bhp = NULL; |
| 1586 | stats->bs_nblocks++; |
| 1587 | if (nreq != NULL) { |
| 1588 | nreq->bpr_ptr = dreq->bpr_ptr + 1; |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1589 | ret = nilfs_bmap_prepare_alloc_ptr(btree, nreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1590 | if (ret < 0) |
| 1591 | goto err_out_dreq; |
| 1592 | |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1593 | ret = nilfs_btree_get_new_block(btree, nreq->bpr_ptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1594 | if (ret < 0) |
| 1595 | goto err_out_nreq; |
| 1596 | |
| 1597 | *bhp = bh; |
| 1598 | stats->bs_nblocks++; |
| 1599 | } |
| 1600 | |
| 1601 | /* success */ |
| 1602 | return 0; |
| 1603 | |
| 1604 | /* error */ |
| 1605 | err_out_nreq: |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1606 | nilfs_bmap_abort_alloc_ptr(btree, nreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1607 | err_out_dreq: |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1608 | nilfs_bmap_abort_alloc_ptr(btree, dreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1609 | stats->bs_nblocks = 0; |
| 1610 | return ret; |
| 1611 | |
| 1612 | } |
| 1613 | |
| 1614 | static void |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1615 | nilfs_btree_commit_convert_and_insert(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1616 | __u64 key, __u64 ptr, |
| 1617 | const __u64 *keys, const __u64 *ptrs, |
Ryusuke Konishi | 3033342 | 2009-05-24 00:09:44 +0900 | [diff] [blame] | 1618 | int n, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1619 | union nilfs_bmap_ptr_req *dreq, |
| 1620 | union nilfs_bmap_ptr_req *nreq, |
| 1621 | struct buffer_head *bh) |
| 1622 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1623 | struct nilfs_btree_node *node; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1624 | struct inode *dat; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1625 | __u64 tmpptr; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1626 | int ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1627 | |
| 1628 | /* free resources */ |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1629 | if (btree->b_ops->bop_clear != NULL) |
| 1630 | btree->b_ops->bop_clear(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1631 | |
| 1632 | /* ptr must be a pointer to a buffer head. */ |
| 1633 | set_buffer_nilfs_volatile((struct buffer_head *)((unsigned long)ptr)); |
| 1634 | |
| 1635 | /* convert and insert */ |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1636 | dat = NILFS_BMAP_USE_VBN(btree) ? nilfs_bmap_get_dat(btree) : NULL; |
| 1637 | nilfs_btree_init(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1638 | if (nreq != NULL) { |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1639 | nilfs_bmap_commit_alloc_ptr(btree, dreq, dat); |
| 1640 | nilfs_bmap_commit_alloc_ptr(btree, nreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1641 | |
| 1642 | /* create child node at level 1 */ |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1643 | node = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1644 | ncblk = nilfs_btree_nchildren_per_block(btree); |
| 1645 | nilfs_btree_node_init(node, 0, 1, n, ncblk, keys, ptrs); |
| 1646 | nilfs_btree_node_insert(node, n, key, dreq->bpr_ptr, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1647 | if (!buffer_dirty(bh)) |
| 1648 | nilfs_btnode_mark_dirty(bh); |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1649 | if (!nilfs_bmap_dirty(btree)) |
| 1650 | nilfs_bmap_set_dirty(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1651 | |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1652 | brelse(bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1653 | |
| 1654 | /* create root node at level 2 */ |
| 1655 | node = nilfs_btree_get_root(btree); |
| 1656 | tmpptr = nreq->bpr_ptr; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1657 | nilfs_btree_node_init(node, NILFS_BTREE_NODE_ROOT, 2, 1, |
| 1658 | NILFS_BTREE_ROOT_NCHILDREN_MAX, |
| 1659 | &keys[0], &tmpptr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1660 | } else { |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1661 | nilfs_bmap_commit_alloc_ptr(btree, dreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1662 | |
| 1663 | /* create root node at level 1 */ |
| 1664 | node = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1665 | nilfs_btree_node_init(node, NILFS_BTREE_NODE_ROOT, 1, n, |
| 1666 | NILFS_BTREE_ROOT_NCHILDREN_MAX, |
| 1667 | keys, ptrs); |
| 1668 | nilfs_btree_node_insert(node, n, key, dreq->bpr_ptr, |
| 1669 | NILFS_BTREE_ROOT_NCHILDREN_MAX); |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1670 | if (!nilfs_bmap_dirty(btree)) |
| 1671 | nilfs_bmap_set_dirty(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1672 | } |
| 1673 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1674 | if (NILFS_BMAP_USE_VBN(btree)) |
Ryusuke Konishi | dc935be | 2010-07-10 22:21:54 +0900 | [diff] [blame] | 1675 | nilfs_bmap_set_target_v(btree, key, dreq->bpr_ptr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1676 | } |
| 1677 | |
| 1678 | /** |
| 1679 | * nilfs_btree_convert_and_insert - |
| 1680 | * @bmap: |
| 1681 | * @key: |
| 1682 | * @ptr: |
| 1683 | * @keys: |
| 1684 | * @ptrs: |
| 1685 | * @n: |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1686 | */ |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1687 | int nilfs_btree_convert_and_insert(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1688 | __u64 key, __u64 ptr, |
Ryusuke Konishi | 3033342 | 2009-05-24 00:09:44 +0900 | [diff] [blame] | 1689 | const __u64 *keys, const __u64 *ptrs, int n) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1690 | { |
| 1691 | struct buffer_head *bh; |
| 1692 | union nilfs_bmap_ptr_req dreq, nreq, *di, *ni; |
| 1693 | struct nilfs_bmap_stats stats; |
| 1694 | int ret; |
| 1695 | |
| 1696 | if (n + 1 <= NILFS_BTREE_ROOT_NCHILDREN_MAX) { |
| 1697 | di = &dreq; |
| 1698 | ni = NULL; |
| 1699 | } else if ((n + 1) <= NILFS_BTREE_NODE_NCHILDREN_MAX( |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1700 | 1 << btree->b_inode->i_blkbits)) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1701 | di = &dreq; |
| 1702 | ni = &nreq; |
| 1703 | } else { |
| 1704 | di = NULL; |
| 1705 | ni = NULL; |
| 1706 | BUG(); |
| 1707 | } |
| 1708 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1709 | ret = nilfs_btree_prepare_convert_and_insert(btree, key, di, ni, &bh, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1710 | &stats); |
| 1711 | if (ret < 0) |
| 1712 | return ret; |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1713 | nilfs_btree_commit_convert_and_insert(btree, key, ptr, keys, ptrs, n, |
Ryusuke Konishi | 3033342 | 2009-05-24 00:09:44 +0900 | [diff] [blame] | 1714 | di, ni, bh); |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1715 | nilfs_bmap_add_blocks(btree, stats.bs_nblocks); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1716 | return 0; |
| 1717 | } |
| 1718 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1719 | static int nilfs_btree_propagate_p(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1720 | struct nilfs_btree_path *path, |
| 1721 | int level, |
| 1722 | struct buffer_head *bh) |
| 1723 | { |
| 1724 | while ((++level < nilfs_btree_height(btree) - 1) && |
| 1725 | !buffer_dirty(path[level].bp_bh)) |
| 1726 | nilfs_btnode_mark_dirty(path[level].bp_bh); |
| 1727 | |
| 1728 | return 0; |
| 1729 | } |
| 1730 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1731 | static int nilfs_btree_prepare_update_v(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1732 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1733 | int level, struct inode *dat) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1734 | { |
| 1735 | struct nilfs_btree_node *parent; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1736 | int ncmax, ret; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1737 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1738 | parent = nilfs_btree_get_node(btree, path, level + 1, &ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1739 | path[level].bp_oldreq.bpr_ptr = |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1740 | nilfs_btree_node_get_ptr(parent, path[level + 1].bp_index, |
| 1741 | ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1742 | 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] | 1743 | ret = nilfs_dat_prepare_update(dat, &path[level].bp_oldreq.bpr_req, |
| 1744 | &path[level].bp_newreq.bpr_req); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1745 | if (ret < 0) |
| 1746 | return ret; |
| 1747 | |
| 1748 | if (buffer_nilfs_node(path[level].bp_bh)) { |
| 1749 | path[level].bp_ctxt.oldkey = path[level].bp_oldreq.bpr_ptr; |
| 1750 | path[level].bp_ctxt.newkey = path[level].bp_newreq.bpr_ptr; |
| 1751 | path[level].bp_ctxt.bh = path[level].bp_bh; |
| 1752 | ret = nilfs_btnode_prepare_change_key( |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1753 | &NILFS_BMAP_I(btree)->i_btnode_cache, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1754 | &path[level].bp_ctxt); |
| 1755 | if (ret < 0) { |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1756 | nilfs_dat_abort_update(dat, |
| 1757 | &path[level].bp_oldreq.bpr_req, |
| 1758 | &path[level].bp_newreq.bpr_req); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1759 | return ret; |
| 1760 | } |
| 1761 | } |
| 1762 | |
| 1763 | return 0; |
| 1764 | } |
| 1765 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1766 | static void nilfs_btree_commit_update_v(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1767 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1768 | int level, struct inode *dat) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1769 | { |
| 1770 | struct nilfs_btree_node *parent; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1771 | int ncmax; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1772 | |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1773 | nilfs_dat_commit_update(dat, &path[level].bp_oldreq.bpr_req, |
| 1774 | &path[level].bp_newreq.bpr_req, |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1775 | btree->b_ptr_type == NILFS_BMAP_PTR_VS); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1776 | |
| 1777 | if (buffer_nilfs_node(path[level].bp_bh)) { |
| 1778 | nilfs_btnode_commit_change_key( |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1779 | &NILFS_BMAP_I(btree)->i_btnode_cache, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1780 | &path[level].bp_ctxt); |
| 1781 | path[level].bp_bh = path[level].bp_ctxt.bh; |
| 1782 | } |
| 1783 | set_buffer_nilfs_volatile(path[level].bp_bh); |
| 1784 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1785 | parent = nilfs_btree_get_node(btree, path, level + 1, &ncmax); |
| 1786 | nilfs_btree_node_set_ptr(parent, path[level + 1].bp_index, |
| 1787 | path[level].bp_newreq.bpr_ptr, ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1788 | } |
| 1789 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1790 | static void nilfs_btree_abort_update_v(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1791 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1792 | int level, struct inode *dat) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1793 | { |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1794 | nilfs_dat_abort_update(dat, &path[level].bp_oldreq.bpr_req, |
| 1795 | &path[level].bp_newreq.bpr_req); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1796 | if (buffer_nilfs_node(path[level].bp_bh)) |
| 1797 | nilfs_btnode_abort_change_key( |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1798 | &NILFS_BMAP_I(btree)->i_btnode_cache, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1799 | &path[level].bp_ctxt); |
| 1800 | } |
| 1801 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1802 | static int nilfs_btree_prepare_propagate_v(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1803 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1804 | int minlevel, int *maxlevelp, |
| 1805 | struct inode *dat) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1806 | { |
| 1807 | int level, ret; |
| 1808 | |
| 1809 | level = minlevel; |
| 1810 | if (!buffer_nilfs_volatile(path[level].bp_bh)) { |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1811 | ret = nilfs_btree_prepare_update_v(btree, path, level, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1812 | if (ret < 0) |
| 1813 | return ret; |
| 1814 | } |
| 1815 | while ((++level < nilfs_btree_height(btree) - 1) && |
| 1816 | !buffer_dirty(path[level].bp_bh)) { |
| 1817 | |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1818 | WARN_ON(buffer_nilfs_volatile(path[level].bp_bh)); |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1819 | ret = nilfs_btree_prepare_update_v(btree, path, level, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1820 | if (ret < 0) |
| 1821 | goto out; |
| 1822 | } |
| 1823 | |
| 1824 | /* success */ |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1825 | *maxlevelp = level - 1; |
| 1826 | return 0; |
| 1827 | |
| 1828 | /* error */ |
| 1829 | out: |
| 1830 | while (--level > minlevel) |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1831 | nilfs_btree_abort_update_v(btree, path, level, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1832 | if (!buffer_nilfs_volatile(path[level].bp_bh)) |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1833 | nilfs_btree_abort_update_v(btree, path, level, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1834 | return ret; |
| 1835 | } |
| 1836 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1837 | static void nilfs_btree_commit_propagate_v(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1838 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1839 | int minlevel, int maxlevel, |
| 1840 | struct buffer_head *bh, |
| 1841 | struct inode *dat) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1842 | { |
| 1843 | int level; |
| 1844 | |
| 1845 | if (!buffer_nilfs_volatile(path[minlevel].bp_bh)) |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1846 | nilfs_btree_commit_update_v(btree, path, minlevel, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1847 | |
| 1848 | for (level = minlevel + 1; level <= maxlevel; level++) |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1849 | nilfs_btree_commit_update_v(btree, path, level, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1850 | } |
| 1851 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1852 | static int nilfs_btree_propagate_v(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1853 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1854 | int level, struct buffer_head *bh) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1855 | { |
Li Hong | 308f441 | 2010-04-02 18:40:39 +0800 | [diff] [blame] | 1856 | int maxlevel = 0, ret; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1857 | struct nilfs_btree_node *parent; |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1858 | struct inode *dat = nilfs_bmap_get_dat(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1859 | __u64 ptr; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1860 | int ncmax; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1861 | |
| 1862 | get_bh(bh); |
| 1863 | path[level].bp_bh = bh; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1864 | ret = nilfs_btree_prepare_propagate_v(btree, path, level, &maxlevel, |
| 1865 | dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1866 | if (ret < 0) |
| 1867 | goto out; |
| 1868 | |
| 1869 | if (buffer_nilfs_volatile(path[level].bp_bh)) { |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1870 | parent = nilfs_btree_get_node(btree, path, level + 1, &ncmax); |
| 1871 | ptr = nilfs_btree_node_get_ptr(parent, |
| 1872 | path[level + 1].bp_index, |
| 1873 | ncmax); |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1874 | ret = nilfs_dat_mark_dirty(dat, ptr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1875 | if (ret < 0) |
| 1876 | goto out; |
| 1877 | } |
| 1878 | |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1879 | nilfs_btree_commit_propagate_v(btree, path, level, maxlevel, bh, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1880 | |
| 1881 | out: |
| 1882 | brelse(path[level].bp_bh); |
| 1883 | path[level].bp_bh = NULL; |
| 1884 | return ret; |
| 1885 | } |
| 1886 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1887 | static int nilfs_btree_propagate(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1888 | struct buffer_head *bh) |
| 1889 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1890 | struct nilfs_btree_path *path; |
| 1891 | struct nilfs_btree_node *node; |
| 1892 | __u64 key; |
| 1893 | int level, ret; |
| 1894 | |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1895 | WARN_ON(!buffer_dirty(bh)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1896 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1897 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1898 | if (path == NULL) |
| 1899 | return -ENOMEM; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1900 | |
| 1901 | if (buffer_nilfs_node(bh)) { |
| 1902 | node = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1903 | key = nilfs_btree_node_get_key(node, 0); |
| 1904 | level = nilfs_btree_node_get_level(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1905 | } else { |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1906 | key = nilfs_bmap_data_get_key(btree, bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1907 | level = NILFS_BTREE_LEVEL_DATA; |
| 1908 | } |
| 1909 | |
| 1910 | ret = nilfs_btree_do_lookup(btree, path, key, NULL, level + 1); |
| 1911 | if (ret < 0) { |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1912 | if (unlikely(ret == -ENOENT)) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1913 | printk(KERN_CRIT "%s: key = %llu, level == %d\n", |
| 1914 | __func__, (unsigned long long)key, level); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1915 | goto out; |
| 1916 | } |
| 1917 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1918 | ret = NILFS_BMAP_USE_VBN(btree) ? |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 1919 | nilfs_btree_propagate_v(btree, path, level, bh) : |
| 1920 | nilfs_btree_propagate_p(btree, path, level, bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1921 | |
| 1922 | out: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1923 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1924 | |
| 1925 | return ret; |
| 1926 | } |
| 1927 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1928 | static int nilfs_btree_propagate_gc(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1929 | struct buffer_head *bh) |
| 1930 | { |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1931 | return nilfs_dat_mark_dirty(nilfs_bmap_get_dat(btree), bh->b_blocknr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1932 | } |
| 1933 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1934 | static void nilfs_btree_add_dirty_buffer(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1935 | struct list_head *lists, |
| 1936 | struct buffer_head *bh) |
| 1937 | { |
| 1938 | struct list_head *head; |
| 1939 | struct buffer_head *cbh; |
| 1940 | struct nilfs_btree_node *node, *cnode; |
| 1941 | __u64 key, ckey; |
| 1942 | int level; |
| 1943 | |
| 1944 | get_bh(bh); |
| 1945 | node = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1946 | key = nilfs_btree_node_get_key(node, 0); |
| 1947 | level = nilfs_btree_node_get_level(node); |
Ryusuke Konishi | cfa913a | 2010-07-07 17:19:54 +0900 | [diff] [blame] | 1948 | if (level < NILFS_BTREE_LEVEL_NODE_MIN || |
| 1949 | level >= NILFS_BTREE_LEVEL_MAX) { |
| 1950 | dump_stack(); |
| 1951 | printk(KERN_WARNING |
| 1952 | "%s: invalid btree level: %d (key=%llu, ino=%lu, " |
| 1953 | "blocknr=%llu)\n", |
| 1954 | __func__, level, (unsigned long long)key, |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1955 | NILFS_BMAP_I(btree)->vfs_inode.i_ino, |
Ryusuke Konishi | cfa913a | 2010-07-07 17:19:54 +0900 | [diff] [blame] | 1956 | (unsigned long long)bh->b_blocknr); |
| 1957 | return; |
| 1958 | } |
| 1959 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1960 | list_for_each(head, &lists[level]) { |
| 1961 | cbh = list_entry(head, struct buffer_head, b_assoc_buffers); |
| 1962 | cnode = (struct nilfs_btree_node *)cbh->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1963 | ckey = nilfs_btree_node_get_key(cnode, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1964 | if (key < ckey) |
| 1965 | break; |
| 1966 | } |
| 1967 | list_add_tail(&bh->b_assoc_buffers, head); |
| 1968 | } |
| 1969 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1970 | static void nilfs_btree_lookup_dirty_buffers(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1971 | struct list_head *listp) |
| 1972 | { |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1973 | struct address_space *btcache = &NILFS_BMAP_I(btree)->i_btnode_cache; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1974 | struct list_head lists[NILFS_BTREE_LEVEL_MAX]; |
| 1975 | struct pagevec pvec; |
| 1976 | struct buffer_head *bh, *head; |
| 1977 | pgoff_t index = 0; |
| 1978 | int level, i; |
| 1979 | |
| 1980 | for (level = NILFS_BTREE_LEVEL_NODE_MIN; |
| 1981 | level < NILFS_BTREE_LEVEL_MAX; |
| 1982 | level++) |
| 1983 | INIT_LIST_HEAD(&lists[level]); |
| 1984 | |
| 1985 | pagevec_init(&pvec, 0); |
| 1986 | |
| 1987 | while (pagevec_lookup_tag(&pvec, btcache, &index, PAGECACHE_TAG_DIRTY, |
| 1988 | PAGEVEC_SIZE)) { |
| 1989 | for (i = 0; i < pagevec_count(&pvec); i++) { |
| 1990 | bh = head = page_buffers(pvec.pages[i]); |
| 1991 | do { |
| 1992 | if (buffer_dirty(bh)) |
| 1993 | nilfs_btree_add_dirty_buffer(btree, |
| 1994 | lists, bh); |
| 1995 | } while ((bh = bh->b_this_page) != head); |
| 1996 | } |
| 1997 | pagevec_release(&pvec); |
| 1998 | cond_resched(); |
| 1999 | } |
| 2000 | |
| 2001 | for (level = NILFS_BTREE_LEVEL_NODE_MIN; |
| 2002 | level < NILFS_BTREE_LEVEL_MAX; |
| 2003 | level++) |
Ryusuke Konishi | 0935db7 | 2009-11-29 02:39:11 +0900 | [diff] [blame] | 2004 | list_splice_tail(&lists[level], listp); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2005 | } |
| 2006 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2007 | static int nilfs_btree_assign_p(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2008 | struct nilfs_btree_path *path, |
| 2009 | int level, |
| 2010 | struct buffer_head **bh, |
| 2011 | sector_t blocknr, |
| 2012 | union nilfs_binfo *binfo) |
| 2013 | { |
| 2014 | struct nilfs_btree_node *parent; |
| 2015 | __u64 key; |
| 2016 | __u64 ptr; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 2017 | int ncmax, ret; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2018 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 2019 | parent = nilfs_btree_get_node(btree, path, level + 1, &ncmax); |
| 2020 | ptr = nilfs_btree_node_get_ptr(parent, path[level + 1].bp_index, |
| 2021 | ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2022 | if (buffer_nilfs_node(*bh)) { |
| 2023 | path[level].bp_ctxt.oldkey = ptr; |
| 2024 | path[level].bp_ctxt.newkey = blocknr; |
| 2025 | path[level].bp_ctxt.bh = *bh; |
| 2026 | ret = nilfs_btnode_prepare_change_key( |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2027 | &NILFS_BMAP_I(btree)->i_btnode_cache, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2028 | &path[level].bp_ctxt); |
| 2029 | if (ret < 0) |
| 2030 | return ret; |
| 2031 | nilfs_btnode_commit_change_key( |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2032 | &NILFS_BMAP_I(btree)->i_btnode_cache, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2033 | &path[level].bp_ctxt); |
| 2034 | *bh = path[level].bp_ctxt.bh; |
| 2035 | } |
| 2036 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 2037 | nilfs_btree_node_set_ptr(parent, path[level + 1].bp_index, blocknr, |
| 2038 | ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2039 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2040 | key = nilfs_btree_node_get_key(parent, path[level + 1].bp_index); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2041 | /* on-disk format */ |
Ryusuke Konishi | 25b8d7d | 2010-07-10 16:50:41 +0900 | [diff] [blame] | 2042 | binfo->bi_dat.bi_blkoff = cpu_to_le64(key); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2043 | binfo->bi_dat.bi_level = level; |
| 2044 | |
| 2045 | return 0; |
| 2046 | } |
| 2047 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2048 | static int nilfs_btree_assign_v(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2049 | struct nilfs_btree_path *path, |
| 2050 | int level, |
| 2051 | struct buffer_head **bh, |
| 2052 | sector_t blocknr, |
| 2053 | union nilfs_binfo *binfo) |
| 2054 | { |
| 2055 | struct nilfs_btree_node *parent; |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2056 | struct inode *dat = nilfs_bmap_get_dat(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2057 | __u64 key; |
| 2058 | __u64 ptr; |
| 2059 | union nilfs_bmap_ptr_req req; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 2060 | int ncmax, ret; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2061 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 2062 | parent = nilfs_btree_get_node(btree, path, level + 1, &ncmax); |
| 2063 | ptr = nilfs_btree_node_get_ptr(parent, path[level + 1].bp_index, |
| 2064 | ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2065 | req.bpr_ptr = ptr; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 2066 | ret = nilfs_dat_prepare_start(dat, &req.bpr_req); |
| 2067 | if (ret < 0) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2068 | return ret; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 2069 | nilfs_dat_commit_start(dat, &req.bpr_req, blocknr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2070 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2071 | key = nilfs_btree_node_get_key(parent, path[level + 1].bp_index); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2072 | /* on-disk format */ |
Ryusuke Konishi | 25b8d7d | 2010-07-10 16:50:41 +0900 | [diff] [blame] | 2073 | binfo->bi_v.bi_vblocknr = cpu_to_le64(ptr); |
| 2074 | binfo->bi_v.bi_blkoff = cpu_to_le64(key); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2075 | |
| 2076 | return 0; |
| 2077 | } |
| 2078 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2079 | static int nilfs_btree_assign(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2080 | struct buffer_head **bh, |
| 2081 | sector_t blocknr, |
| 2082 | union nilfs_binfo *binfo) |
| 2083 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2084 | struct nilfs_btree_path *path; |
| 2085 | struct nilfs_btree_node *node; |
| 2086 | __u64 key; |
| 2087 | int level, ret; |
| 2088 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2089 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2090 | if (path == NULL) |
| 2091 | return -ENOMEM; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2092 | |
| 2093 | if (buffer_nilfs_node(*bh)) { |
| 2094 | node = (struct nilfs_btree_node *)(*bh)->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2095 | key = nilfs_btree_node_get_key(node, 0); |
| 2096 | level = nilfs_btree_node_get_level(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2097 | } else { |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2098 | key = nilfs_bmap_data_get_key(btree, *bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2099 | level = NILFS_BTREE_LEVEL_DATA; |
| 2100 | } |
| 2101 | |
| 2102 | ret = nilfs_btree_do_lookup(btree, path, key, NULL, level + 1); |
| 2103 | if (ret < 0) { |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 2104 | WARN_ON(ret == -ENOENT); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2105 | goto out; |
| 2106 | } |
| 2107 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2108 | ret = NILFS_BMAP_USE_VBN(btree) ? |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 2109 | nilfs_btree_assign_v(btree, path, level, bh, blocknr, binfo) : |
| 2110 | nilfs_btree_assign_p(btree, path, level, bh, blocknr, binfo); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2111 | |
| 2112 | out: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2113 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2114 | |
| 2115 | return ret; |
| 2116 | } |
| 2117 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2118 | static int nilfs_btree_assign_gc(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2119 | struct buffer_head **bh, |
| 2120 | sector_t blocknr, |
| 2121 | union nilfs_binfo *binfo) |
| 2122 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2123 | struct nilfs_btree_node *node; |
| 2124 | __u64 key; |
| 2125 | int ret; |
| 2126 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2127 | ret = nilfs_dat_move(nilfs_bmap_get_dat(btree), (*bh)->b_blocknr, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 2128 | blocknr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2129 | if (ret < 0) |
| 2130 | return ret; |
| 2131 | |
| 2132 | if (buffer_nilfs_node(*bh)) { |
| 2133 | node = (struct nilfs_btree_node *)(*bh)->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2134 | key = nilfs_btree_node_get_key(node, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2135 | } else |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2136 | key = nilfs_bmap_data_get_key(btree, *bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2137 | |
| 2138 | /* on-disk format */ |
| 2139 | binfo->bi_v.bi_vblocknr = cpu_to_le64((*bh)->b_blocknr); |
Ryusuke Konishi | 25b8d7d | 2010-07-10 16:50:41 +0900 | [diff] [blame] | 2140 | binfo->bi_v.bi_blkoff = cpu_to_le64(key); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2141 | |
| 2142 | return 0; |
| 2143 | } |
| 2144 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2145 | static int nilfs_btree_mark(struct nilfs_bmap *btree, __u64 key, int level) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2146 | { |
| 2147 | struct buffer_head *bh; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2148 | struct nilfs_btree_path *path; |
| 2149 | __u64 ptr; |
| 2150 | int ret; |
| 2151 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2152 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2153 | if (path == NULL) |
| 2154 | return -ENOMEM; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2155 | |
| 2156 | ret = nilfs_btree_do_lookup(btree, path, key, &ptr, level + 1); |
| 2157 | if (ret < 0) { |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 2158 | WARN_ON(ret == -ENOENT); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2159 | goto out; |
| 2160 | } |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 2161 | ret = nilfs_btree_get_block(btree, ptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2162 | if (ret < 0) { |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 2163 | WARN_ON(ret == -ENOENT); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2164 | goto out; |
| 2165 | } |
| 2166 | |
| 2167 | if (!buffer_dirty(bh)) |
| 2168 | nilfs_btnode_mark_dirty(bh); |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 2169 | brelse(bh); |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2170 | if (!nilfs_bmap_dirty(btree)) |
| 2171 | nilfs_bmap_set_dirty(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2172 | |
| 2173 | out: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2174 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2175 | return ret; |
| 2176 | } |
| 2177 | |
| 2178 | static const struct nilfs_bmap_operations nilfs_btree_ops = { |
| 2179 | .bop_lookup = nilfs_btree_lookup, |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 2180 | .bop_lookup_contig = nilfs_btree_lookup_contig, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2181 | .bop_insert = nilfs_btree_insert, |
| 2182 | .bop_delete = nilfs_btree_delete, |
| 2183 | .bop_clear = NULL, |
| 2184 | |
| 2185 | .bop_propagate = nilfs_btree_propagate, |
| 2186 | |
| 2187 | .bop_lookup_dirty_buffers = nilfs_btree_lookup_dirty_buffers, |
| 2188 | |
| 2189 | .bop_assign = nilfs_btree_assign, |
| 2190 | .bop_mark = nilfs_btree_mark, |
| 2191 | |
| 2192 | .bop_last_key = nilfs_btree_last_key, |
| 2193 | .bop_check_insert = NULL, |
| 2194 | .bop_check_delete = nilfs_btree_check_delete, |
| 2195 | .bop_gather_data = nilfs_btree_gather_data, |
| 2196 | }; |
| 2197 | |
| 2198 | static const struct nilfs_bmap_operations nilfs_btree_ops_gc = { |
| 2199 | .bop_lookup = NULL, |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 2200 | .bop_lookup_contig = NULL, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2201 | .bop_insert = NULL, |
| 2202 | .bop_delete = NULL, |
| 2203 | .bop_clear = NULL, |
| 2204 | |
| 2205 | .bop_propagate = nilfs_btree_propagate_gc, |
| 2206 | |
| 2207 | .bop_lookup_dirty_buffers = nilfs_btree_lookup_dirty_buffers, |
| 2208 | |
| 2209 | .bop_assign = nilfs_btree_assign_gc, |
| 2210 | .bop_mark = NULL, |
| 2211 | |
| 2212 | .bop_last_key = NULL, |
| 2213 | .bop_check_insert = NULL, |
| 2214 | .bop_check_delete = NULL, |
| 2215 | .bop_gather_data = NULL, |
| 2216 | }; |
| 2217 | |
Ryusuke Konishi | 3033342 | 2009-05-24 00:09:44 +0900 | [diff] [blame] | 2218 | int nilfs_btree_init(struct nilfs_bmap *bmap) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2219 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2220 | bmap->b_ops = &nilfs_btree_ops; |
Ryusuke Konishi | 5ad2686e9 | 2010-07-13 23:33:54 +0900 | [diff] [blame^] | 2221 | bmap->b_nchildren_per_block = |
| 2222 | NILFS_BTREE_NODE_NCHILDREN_MAX(nilfs_btree_node_size(bmap)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2223 | return 0; |
| 2224 | } |
| 2225 | |
| 2226 | void nilfs_btree_init_gc(struct nilfs_bmap *bmap) |
| 2227 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2228 | bmap->b_ops = &nilfs_btree_ops_gc; |
Ryusuke Konishi | 5ad2686e9 | 2010-07-13 23:33:54 +0900 | [diff] [blame^] | 2229 | bmap->b_nchildren_per_block = |
| 2230 | NILFS_BTREE_NODE_NCHILDREN_MAX(nilfs_btree_node_size(bmap)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2231 | } |