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 | |
Ryusuke Konishi | 957ed60 | 2015-02-27 15:51:56 -0800 | [diff] [blame] | 34 | static void __nilfs_btree_init(struct nilfs_bmap *bmap); |
| 35 | |
Li Hong | f905440 | 2010-04-02 17:36:34 +0800 | [diff] [blame] | 36 | static struct nilfs_btree_path *nilfs_btree_alloc_path(void) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 37 | { |
Li Hong | f905440 | 2010-04-02 17:36:34 +0800 | [diff] [blame] | 38 | struct nilfs_btree_path *path; |
| 39 | int level = NILFS_BTREE_LEVEL_DATA; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 40 | |
Li Hong | f905440 | 2010-04-02 17:36:34 +0800 | [diff] [blame] | 41 | path = kmem_cache_alloc(nilfs_btree_path_cache, GFP_NOFS); |
| 42 | if (path == NULL) |
| 43 | goto out; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 44 | |
Li Hong | f905440 | 2010-04-02 17:36:34 +0800 | [diff] [blame] | 45 | for (; level < NILFS_BTREE_LEVEL_MAX; level++) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 46 | path[level].bp_bh = NULL; |
| 47 | path[level].bp_sib_bh = NULL; |
| 48 | path[level].bp_index = 0; |
| 49 | path[level].bp_oldreq.bpr_ptr = NILFS_BMAP_INVALID_PTR; |
| 50 | path[level].bp_newreq.bpr_ptr = NILFS_BMAP_INVALID_PTR; |
| 51 | path[level].bp_op = NULL; |
| 52 | } |
Li Hong | f905440 | 2010-04-02 17:36:34 +0800 | [diff] [blame] | 53 | |
| 54 | out: |
| 55 | return path; |
| 56 | } |
| 57 | |
Li Hong | 73bb488 | 2010-04-02 18:35:00 +0800 | [diff] [blame] | 58 | static void nilfs_btree_free_path(struct nilfs_btree_path *path) |
Li Hong | f905440 | 2010-04-02 17:36:34 +0800 | [diff] [blame] | 59 | { |
Li Hong | 73bb488 | 2010-04-02 18:35:00 +0800 | [diff] [blame] | 60 | int level = NILFS_BTREE_LEVEL_DATA; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 61 | |
Li Hong | 73bb488 | 2010-04-02 18:35:00 +0800 | [diff] [blame] | 62 | for (; level < NILFS_BTREE_LEVEL_MAX; level++) |
Ryusuke Konishi | 3218929 | 2009-08-15 01:54:59 +0900 | [diff] [blame] | 63 | brelse(path[level].bp_bh); |
Li Hong | 73bb488 | 2010-04-02 18:35:00 +0800 | [diff] [blame] | 64 | |
| 65 | kmem_cache_free(nilfs_btree_path_cache, path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 66 | } |
| 67 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 68 | /* |
| 69 | * B-tree node operations |
| 70 | */ |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 71 | static int nilfs_btree_get_new_block(const struct nilfs_bmap *btree, |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 72 | __u64 ptr, struct buffer_head **bhp) |
| 73 | { |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 74 | struct address_space *btnc = &NILFS_BMAP_I(btree)->i_btnode_cache; |
Ryusuke Konishi | 45f4910 | 2009-11-13 16:25:19 +0900 | [diff] [blame] | 75 | struct buffer_head *bh; |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 76 | |
Ryusuke Konishi | 45f4910 | 2009-11-13 16:25:19 +0900 | [diff] [blame] | 77 | bh = nilfs_btnode_create_block(btnc, ptr); |
| 78 | if (!bh) |
| 79 | return -ENOMEM; |
| 80 | |
| 81 | set_buffer_nilfs_volatile(bh); |
| 82 | *bhp = bh; |
| 83 | return 0; |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 84 | } |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 85 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame] | 86 | static int nilfs_btree_node_get_flags(const struct nilfs_btree_node *node) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 87 | { |
| 88 | return node->bn_flags; |
| 89 | } |
| 90 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame] | 91 | static void |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 92 | nilfs_btree_node_set_flags(struct nilfs_btree_node *node, int flags) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 93 | { |
| 94 | node->bn_flags = flags; |
| 95 | } |
| 96 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame] | 97 | static int nilfs_btree_node_root(const struct nilfs_btree_node *node) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 98 | { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 99 | return nilfs_btree_node_get_flags(node) & NILFS_BTREE_NODE_ROOT; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 100 | } |
| 101 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame] | 102 | static int nilfs_btree_node_get_level(const struct nilfs_btree_node *node) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 103 | { |
| 104 | return node->bn_level; |
| 105 | } |
| 106 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame] | 107 | static void |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 108 | nilfs_btree_node_set_level(struct nilfs_btree_node *node, int level) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 109 | { |
| 110 | node->bn_level = level; |
| 111 | } |
| 112 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame] | 113 | static int nilfs_btree_node_get_nchildren(const struct nilfs_btree_node *node) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 114 | { |
| 115 | return le16_to_cpu(node->bn_nchildren); |
| 116 | } |
| 117 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame] | 118 | static void |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 119 | nilfs_btree_node_set_nchildren(struct nilfs_btree_node *node, int nchildren) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 120 | { |
| 121 | node->bn_nchildren = cpu_to_le16(nchildren); |
| 122 | } |
| 123 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame] | 124 | static int nilfs_btree_node_size(const struct nilfs_bmap *btree) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 125 | { |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 126 | return 1 << btree->b_inode->i_blkbits; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 127 | } |
| 128 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 129 | static int nilfs_btree_nchildren_per_block(const struct nilfs_bmap *btree) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 130 | { |
Ryusuke Konishi | 5ad2686e9 | 2010-07-13 23:33:54 +0900 | [diff] [blame] | 131 | return btree->b_nchildren_per_block; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 132 | } |
| 133 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame] | 134 | static __le64 * |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 135 | nilfs_btree_node_dkeys(const struct nilfs_btree_node *node) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 136 | { |
| 137 | return (__le64 *)((char *)(node + 1) + |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 138 | (nilfs_btree_node_root(node) ? |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 139 | 0 : NILFS_BTREE_NODE_EXTRA_PAD_SIZE)); |
| 140 | } |
| 141 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame] | 142 | static __le64 * |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 143 | nilfs_btree_node_dptrs(const struct nilfs_btree_node *node, int ncmax) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 144 | { |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 145 | return (__le64 *)(nilfs_btree_node_dkeys(node) + ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 146 | } |
| 147 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame] | 148 | static __u64 |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 149 | 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] | 150 | { |
Ryusuke Konishi | 25b8d7d | 2010-07-10 16:50:41 +0900 | [diff] [blame] | 151 | return le64_to_cpu(*(nilfs_btree_node_dkeys(node) + index)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 152 | } |
| 153 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame] | 154 | static void |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 155 | 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] | 156 | { |
Ryusuke Konishi | 25b8d7d | 2010-07-10 16:50:41 +0900 | [diff] [blame] | 157 | *(nilfs_btree_node_dkeys(node) + index) = cpu_to_le64(key); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 158 | } |
| 159 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame] | 160 | static __u64 |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 161 | nilfs_btree_node_get_ptr(const struct nilfs_btree_node *node, int index, |
| 162 | int ncmax) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 163 | { |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 164 | return le64_to_cpu(*(nilfs_btree_node_dptrs(node, ncmax) + index)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 165 | } |
| 166 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame] | 167 | static void |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 168 | nilfs_btree_node_set_ptr(struct nilfs_btree_node *node, int index, __u64 ptr, |
| 169 | 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 | *(nilfs_btree_node_dptrs(node, ncmax) + index) = cpu_to_le64(ptr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 172 | } |
| 173 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 174 | static void nilfs_btree_node_init(struct nilfs_btree_node *node, int flags, |
| 175 | int level, int nchildren, int ncmax, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 176 | const __u64 *keys, const __u64 *ptrs) |
| 177 | { |
| 178 | __le64 *dkeys; |
| 179 | __le64 *dptrs; |
| 180 | int i; |
| 181 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 182 | nilfs_btree_node_set_flags(node, flags); |
| 183 | nilfs_btree_node_set_level(node, level); |
| 184 | nilfs_btree_node_set_nchildren(node, nchildren); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 185 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 186 | dkeys = nilfs_btree_node_dkeys(node); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 187 | dptrs = nilfs_btree_node_dptrs(node, ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 188 | for (i = 0; i < nchildren; i++) { |
Ryusuke Konishi | 25b8d7d | 2010-07-10 16:50:41 +0900 | [diff] [blame] | 189 | dkeys[i] = cpu_to_le64(keys[i]); |
| 190 | dptrs[i] = cpu_to_le64(ptrs[i]); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 191 | } |
| 192 | } |
| 193 | |
| 194 | /* Assume the buffer heads corresponding to left and right are locked. */ |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 195 | static void nilfs_btree_node_move_left(struct nilfs_btree_node *left, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 196 | struct nilfs_btree_node *right, |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 197 | int n, int lncmax, int rncmax) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 198 | { |
| 199 | __le64 *ldkeys, *rdkeys; |
| 200 | __le64 *ldptrs, *rdptrs; |
| 201 | int lnchildren, rnchildren; |
| 202 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 203 | ldkeys = nilfs_btree_node_dkeys(left); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 204 | ldptrs = nilfs_btree_node_dptrs(left, lncmax); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 205 | lnchildren = nilfs_btree_node_get_nchildren(left); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 206 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 207 | rdkeys = nilfs_btree_node_dkeys(right); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 208 | rdptrs = nilfs_btree_node_dptrs(right, rncmax); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 209 | rnchildren = nilfs_btree_node_get_nchildren(right); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 210 | |
| 211 | memcpy(ldkeys + lnchildren, rdkeys, n * sizeof(*rdkeys)); |
| 212 | memcpy(ldptrs + lnchildren, rdptrs, n * sizeof(*rdptrs)); |
| 213 | memmove(rdkeys, rdkeys + n, (rnchildren - n) * sizeof(*rdkeys)); |
| 214 | memmove(rdptrs, rdptrs + n, (rnchildren - n) * sizeof(*rdptrs)); |
| 215 | |
| 216 | lnchildren += n; |
| 217 | rnchildren -= n; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 218 | nilfs_btree_node_set_nchildren(left, lnchildren); |
| 219 | nilfs_btree_node_set_nchildren(right, rnchildren); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 220 | } |
| 221 | |
| 222 | /* Assume that the buffer heads corresponding to left and right are locked. */ |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 223 | static void nilfs_btree_node_move_right(struct nilfs_btree_node *left, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 224 | struct nilfs_btree_node *right, |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 225 | int n, int lncmax, int rncmax) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 226 | { |
| 227 | __le64 *ldkeys, *rdkeys; |
| 228 | __le64 *ldptrs, *rdptrs; |
| 229 | int lnchildren, rnchildren; |
| 230 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 231 | ldkeys = nilfs_btree_node_dkeys(left); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 232 | ldptrs = nilfs_btree_node_dptrs(left, lncmax); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 233 | lnchildren = nilfs_btree_node_get_nchildren(left); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 234 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 235 | rdkeys = nilfs_btree_node_dkeys(right); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 236 | rdptrs = nilfs_btree_node_dptrs(right, rncmax); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 237 | rnchildren = nilfs_btree_node_get_nchildren(right); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 238 | |
| 239 | memmove(rdkeys + n, rdkeys, rnchildren * sizeof(*rdkeys)); |
| 240 | memmove(rdptrs + n, rdptrs, rnchildren * sizeof(*rdptrs)); |
| 241 | memcpy(rdkeys, ldkeys + lnchildren - n, n * sizeof(*rdkeys)); |
| 242 | memcpy(rdptrs, ldptrs + lnchildren - n, n * sizeof(*rdptrs)); |
| 243 | |
| 244 | lnchildren -= n; |
| 245 | rnchildren += n; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 246 | nilfs_btree_node_set_nchildren(left, lnchildren); |
| 247 | nilfs_btree_node_set_nchildren(right, rnchildren); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 248 | } |
| 249 | |
| 250 | /* Assume that the buffer head corresponding to node is locked. */ |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 251 | static void nilfs_btree_node_insert(struct nilfs_btree_node *node, int index, |
| 252 | __u64 key, __u64 ptr, int ncmax) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 253 | { |
| 254 | __le64 *dkeys; |
| 255 | __le64 *dptrs; |
| 256 | int nchildren; |
| 257 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 258 | dkeys = nilfs_btree_node_dkeys(node); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 259 | dptrs = nilfs_btree_node_dptrs(node, ncmax); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 260 | nchildren = nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 261 | if (index < nchildren) { |
| 262 | memmove(dkeys + index + 1, dkeys + index, |
| 263 | (nchildren - index) * sizeof(*dkeys)); |
| 264 | memmove(dptrs + index + 1, dptrs + index, |
| 265 | (nchildren - index) * sizeof(*dptrs)); |
| 266 | } |
Ryusuke Konishi | 25b8d7d | 2010-07-10 16:50:41 +0900 | [diff] [blame] | 267 | dkeys[index] = cpu_to_le64(key); |
| 268 | dptrs[index] = cpu_to_le64(ptr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 269 | nchildren++; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 270 | nilfs_btree_node_set_nchildren(node, nchildren); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 271 | } |
| 272 | |
| 273 | /* Assume that the buffer head corresponding to node is locked. */ |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 274 | static void nilfs_btree_node_delete(struct nilfs_btree_node *node, int index, |
| 275 | __u64 *keyp, __u64 *ptrp, int ncmax) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 276 | { |
| 277 | __u64 key; |
| 278 | __u64 ptr; |
| 279 | __le64 *dkeys; |
| 280 | __le64 *dptrs; |
| 281 | int nchildren; |
| 282 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 283 | dkeys = nilfs_btree_node_dkeys(node); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 284 | dptrs = nilfs_btree_node_dptrs(node, ncmax); |
Ryusuke Konishi | 25b8d7d | 2010-07-10 16:50:41 +0900 | [diff] [blame] | 285 | key = le64_to_cpu(dkeys[index]); |
| 286 | ptr = le64_to_cpu(dptrs[index]); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 287 | nchildren = nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 288 | if (keyp != NULL) |
| 289 | *keyp = key; |
| 290 | if (ptrp != NULL) |
| 291 | *ptrp = ptr; |
| 292 | |
| 293 | if (index < nchildren - 1) { |
| 294 | memmove(dkeys + index, dkeys + index + 1, |
| 295 | (nchildren - index - 1) * sizeof(*dkeys)); |
| 296 | memmove(dptrs + index, dptrs + index + 1, |
| 297 | (nchildren - index - 1) * sizeof(*dptrs)); |
| 298 | } |
| 299 | nchildren--; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 300 | nilfs_btree_node_set_nchildren(node, nchildren); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 301 | } |
| 302 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 303 | static int nilfs_btree_node_lookup(const struct nilfs_btree_node *node, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 304 | __u64 key, int *indexp) |
| 305 | { |
| 306 | __u64 nkey; |
| 307 | int index, low, high, s; |
| 308 | |
| 309 | /* binary search */ |
| 310 | low = 0; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 311 | high = nilfs_btree_node_get_nchildren(node) - 1; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 312 | index = 0; |
| 313 | s = 0; |
| 314 | while (low <= high) { |
| 315 | index = (low + high) / 2; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 316 | nkey = nilfs_btree_node_get_key(node, index); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 317 | if (nkey == key) { |
| 318 | s = 0; |
| 319 | goto out; |
| 320 | } else if (nkey < key) { |
| 321 | low = index + 1; |
| 322 | s = -1; |
| 323 | } else { |
| 324 | high = index - 1; |
| 325 | s = 1; |
| 326 | } |
| 327 | } |
| 328 | |
| 329 | /* adjust index */ |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 330 | if (nilfs_btree_node_get_level(node) > NILFS_BTREE_LEVEL_NODE_MIN) { |
| 331 | if (s > 0 && index > 0) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 332 | index--; |
| 333 | } else if (s < 0) |
| 334 | index++; |
| 335 | |
| 336 | out: |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 337 | *indexp = index; |
| 338 | |
| 339 | return s == 0; |
| 340 | } |
| 341 | |
Ryusuke Konishi | 1d5385b | 2010-07-16 23:52:40 +0900 | [diff] [blame] | 342 | /** |
| 343 | * nilfs_btree_node_broken - verify consistency of btree node |
| 344 | * @node: btree node block to be examined |
| 345 | * @size: node size (in bytes) |
| 346 | * @blocknr: block number |
| 347 | * |
| 348 | * Return Value: If node is broken, 1 is returned. Otherwise, 0 is returned. |
| 349 | */ |
| 350 | static int nilfs_btree_node_broken(const struct nilfs_btree_node *node, |
| 351 | size_t size, sector_t blocknr) |
| 352 | { |
| 353 | int level, flags, nchildren; |
| 354 | int ret = 0; |
| 355 | |
| 356 | level = nilfs_btree_node_get_level(node); |
| 357 | flags = nilfs_btree_node_get_flags(node); |
| 358 | nchildren = nilfs_btree_node_get_nchildren(node); |
| 359 | |
| 360 | if (unlikely(level < NILFS_BTREE_LEVEL_NODE_MIN || |
| 361 | level >= NILFS_BTREE_LEVEL_MAX || |
| 362 | (flags & NILFS_BTREE_NODE_ROOT) || |
| 363 | nchildren < 0 || |
| 364 | nchildren > NILFS_BTREE_NODE_NCHILDREN_MAX(size))) { |
| 365 | printk(KERN_CRIT "NILFS: bad btree node (blocknr=%llu): " |
| 366 | "level = %d, flags = 0x%x, nchildren = %d\n", |
| 367 | (unsigned long long)blocknr, level, flags, nchildren); |
| 368 | ret = 1; |
| 369 | } |
| 370 | return ret; |
| 371 | } |
| 372 | |
Ryusuke Konishi | 957ed60 | 2015-02-27 15:51:56 -0800 | [diff] [blame] | 373 | /** |
| 374 | * nilfs_btree_root_broken - verify consistency of btree root node |
| 375 | * @node: btree root node to be examined |
| 376 | * @ino: inode number |
| 377 | * |
| 378 | * Return Value: If node is broken, 1 is returned. Otherwise, 0 is returned. |
| 379 | */ |
| 380 | static int nilfs_btree_root_broken(const struct nilfs_btree_node *node, |
| 381 | unsigned long ino) |
| 382 | { |
| 383 | int level, flags, nchildren; |
| 384 | int ret = 0; |
| 385 | |
| 386 | level = nilfs_btree_node_get_level(node); |
| 387 | flags = nilfs_btree_node_get_flags(node); |
| 388 | nchildren = nilfs_btree_node_get_nchildren(node); |
| 389 | |
| 390 | if (unlikely(level < NILFS_BTREE_LEVEL_NODE_MIN || |
| 391 | level > NILFS_BTREE_LEVEL_MAX || |
| 392 | nchildren < 0 || |
| 393 | nchildren > NILFS_BTREE_ROOT_NCHILDREN_MAX)) { |
| 394 | pr_crit("NILFS: bad btree root (inode number=%lu): level = %d, flags = 0x%x, nchildren = %d\n", |
| 395 | ino, level, flags, nchildren); |
| 396 | ret = 1; |
| 397 | } |
| 398 | return ret; |
| 399 | } |
| 400 | |
Ryusuke Konishi | 1d5385b | 2010-07-16 23:52:40 +0900 | [diff] [blame] | 401 | int nilfs_btree_broken_node_block(struct buffer_head *bh) |
| 402 | { |
Ryusuke Konishi | 4e13e66 | 2010-07-18 10:42:25 +0900 | [diff] [blame] | 403 | int ret; |
| 404 | |
| 405 | if (buffer_nilfs_checked(bh)) |
| 406 | return 0; |
| 407 | |
| 408 | ret = nilfs_btree_node_broken((struct nilfs_btree_node *)bh->b_data, |
Ryusuke Konishi | 1d5385b | 2010-07-16 23:52:40 +0900 | [diff] [blame] | 409 | bh->b_size, bh->b_blocknr); |
Ryusuke Konishi | 4e13e66 | 2010-07-18 10:42:25 +0900 | [diff] [blame] | 410 | if (likely(!ret)) |
| 411 | set_buffer_nilfs_checked(bh); |
| 412 | return ret; |
Ryusuke Konishi | 1d5385b | 2010-07-16 23:52:40 +0900 | [diff] [blame] | 413 | } |
| 414 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame] | 415 | static struct nilfs_btree_node * |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 416 | nilfs_btree_get_root(const struct nilfs_bmap *btree) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 417 | { |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 418 | return (struct nilfs_btree_node *)btree->b_u.u_data; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 419 | } |
| 420 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame] | 421 | static struct nilfs_btree_node * |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 422 | 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] | 423 | { |
| 424 | return (struct nilfs_btree_node *)path[level].bp_bh->b_data; |
| 425 | } |
| 426 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame] | 427 | static struct nilfs_btree_node * |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 428 | 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] | 429 | { |
| 430 | return (struct nilfs_btree_node *)path[level].bp_sib_bh->b_data; |
| 431 | } |
| 432 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame] | 433 | static int nilfs_btree_height(const struct nilfs_bmap *btree) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 434 | { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 435 | return nilfs_btree_node_get_level(nilfs_btree_get_root(btree)) + 1; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 436 | } |
| 437 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 438 | static struct nilfs_btree_node * |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 439 | nilfs_btree_get_node(const struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 440 | const struct nilfs_btree_path *path, |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 441 | int level, int *ncmaxp) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 442 | { |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 443 | struct nilfs_btree_node *node; |
| 444 | |
| 445 | if (level == nilfs_btree_height(btree) - 1) { |
| 446 | node = nilfs_btree_get_root(btree); |
| 447 | *ncmaxp = NILFS_BTREE_ROOT_NCHILDREN_MAX; |
| 448 | } else { |
| 449 | node = nilfs_btree_get_nonroot_node(path, level); |
| 450 | *ncmaxp = nilfs_btree_nchildren_per_block(btree); |
| 451 | } |
| 452 | return node; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 453 | } |
| 454 | |
Ryusuke Konishi | 7c397a8 | 2010-07-13 23:33:55 +0900 | [diff] [blame] | 455 | static int |
Ryusuke Konishi | 9b945d5 | 2009-10-10 22:58:10 +0900 | [diff] [blame] | 456 | nilfs_btree_bad_node(struct nilfs_btree_node *node, int level) |
| 457 | { |
| 458 | if (unlikely(nilfs_btree_node_get_level(node) != level)) { |
| 459 | dump_stack(); |
| 460 | printk(KERN_CRIT "NILFS: btree level mismatch: %d != %d\n", |
| 461 | nilfs_btree_node_get_level(node), level); |
| 462 | return 1; |
| 463 | } |
| 464 | return 0; |
| 465 | } |
| 466 | |
Ryusuke Konishi | 464ece8 | 2010-07-18 10:42:24 +0900 | [diff] [blame] | 467 | struct nilfs_btree_readahead_info { |
| 468 | struct nilfs_btree_node *node; /* parent node */ |
| 469 | int max_ra_blocks; /* max nof blocks to read ahead */ |
| 470 | int index; /* current index on the parent node */ |
| 471 | int ncmax; /* nof children in the parent node */ |
| 472 | }; |
| 473 | |
| 474 | static int __nilfs_btree_get_block(const struct nilfs_bmap *btree, __u64 ptr, |
| 475 | struct buffer_head **bhp, |
| 476 | const struct nilfs_btree_readahead_info *ra) |
| 477 | { |
| 478 | struct address_space *btnc = &NILFS_BMAP_I(btree)->i_btnode_cache; |
| 479 | struct buffer_head *bh, *ra_bh; |
| 480 | sector_t submit_ptr = 0; |
| 481 | int ret; |
| 482 | |
| 483 | ret = nilfs_btnode_submit_block(btnc, ptr, 0, READ, &bh, &submit_ptr); |
| 484 | if (ret) { |
| 485 | if (ret != -EEXIST) |
| 486 | return ret; |
| 487 | goto out_check; |
| 488 | } |
| 489 | |
| 490 | if (ra) { |
| 491 | int i, n; |
| 492 | __u64 ptr2; |
| 493 | |
| 494 | /* read ahead sibling nodes */ |
| 495 | for (n = ra->max_ra_blocks, i = ra->index + 1; |
| 496 | n > 0 && i < ra->ncmax; n--, i++) { |
| 497 | ptr2 = nilfs_btree_node_get_ptr(ra->node, i, ra->ncmax); |
| 498 | |
| 499 | ret = nilfs_btnode_submit_block(btnc, ptr2, 0, READA, |
| 500 | &ra_bh, &submit_ptr); |
| 501 | if (likely(!ret || ret == -EEXIST)) |
| 502 | brelse(ra_bh); |
| 503 | else if (ret != -EBUSY) |
| 504 | break; |
| 505 | if (!buffer_locked(bh)) |
| 506 | goto out_no_wait; |
| 507 | } |
| 508 | } |
| 509 | |
| 510 | wait_on_buffer(bh); |
| 511 | |
| 512 | out_no_wait: |
| 513 | if (!buffer_uptodate(bh)) { |
| 514 | brelse(bh); |
| 515 | return -EIO; |
| 516 | } |
| 517 | |
| 518 | out_check: |
| 519 | if (nilfs_btree_broken_node_block(bh)) { |
| 520 | clear_buffer_uptodate(bh); |
| 521 | brelse(bh); |
| 522 | return -EINVAL; |
| 523 | } |
| 524 | |
| 525 | *bhp = bh; |
| 526 | return 0; |
| 527 | } |
| 528 | |
| 529 | static int nilfs_btree_get_block(const struct nilfs_bmap *btree, __u64 ptr, |
| 530 | struct buffer_head **bhp) |
| 531 | { |
| 532 | return __nilfs_btree_get_block(btree, ptr, bhp, NULL); |
| 533 | } |
| 534 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 535 | static int nilfs_btree_do_lookup(const struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 536 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 03bdb5a | 2010-07-18 10:42:26 +0900 | [diff] [blame] | 537 | __u64 key, __u64 *ptrp, int minlevel, |
| 538 | int readahead) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 539 | { |
| 540 | struct nilfs_btree_node *node; |
Ryusuke Konishi | 03bdb5a | 2010-07-18 10:42:26 +0900 | [diff] [blame] | 541 | struct nilfs_btree_readahead_info p, *ra; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 542 | __u64 ptr; |
Ryusuke Konishi | ea64ab8 | 2010-07-13 23:33:52 +0900 | [diff] [blame] | 543 | int level, index, found, ncmax, ret; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 544 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 545 | node = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 546 | level = nilfs_btree_node_get_level(node); |
| 547 | if (level < minlevel || nilfs_btree_node_get_nchildren(node) <= 0) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 548 | return -ENOENT; |
| 549 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 550 | found = nilfs_btree_node_lookup(node, key, &index); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 551 | ptr = nilfs_btree_node_get_ptr(node, index, |
| 552 | NILFS_BTREE_ROOT_NCHILDREN_MAX); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 553 | path[level].bp_bh = NULL; |
| 554 | path[level].bp_index = index; |
| 555 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 556 | ncmax = nilfs_btree_nchildren_per_block(btree); |
Ryusuke Konishi | ea64ab8 | 2010-07-13 23:33:52 +0900 | [diff] [blame] | 557 | |
Ryusuke Konishi | 03bdb5a | 2010-07-18 10:42:26 +0900 | [diff] [blame] | 558 | while (--level >= minlevel) { |
| 559 | ra = NULL; |
| 560 | if (level == NILFS_BTREE_LEVEL_NODE_MIN && readahead) { |
| 561 | p.node = nilfs_btree_get_node(btree, path, level + 1, |
| 562 | &p.ncmax); |
| 563 | p.index = index; |
| 564 | p.max_ra_blocks = 7; |
| 565 | ra = &p; |
| 566 | } |
| 567 | ret = __nilfs_btree_get_block(btree, ptr, &path[level].bp_bh, |
| 568 | ra); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 569 | if (ret < 0) |
| 570 | return ret; |
Ryusuke Konishi | 03bdb5a | 2010-07-18 10:42:26 +0900 | [diff] [blame] | 571 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 572 | node = nilfs_btree_get_nonroot_node(path, level); |
Ryusuke Konishi | 9b945d5 | 2009-10-10 22:58:10 +0900 | [diff] [blame] | 573 | if (nilfs_btree_bad_node(node, level)) |
| 574 | return -EINVAL; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 575 | if (!found) |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 576 | found = nilfs_btree_node_lookup(node, key, &index); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 577 | else |
| 578 | index = 0; |
Ryusuke Konishi | ea64ab8 | 2010-07-13 23:33:52 +0900 | [diff] [blame] | 579 | if (index < ncmax) { |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 580 | ptr = nilfs_btree_node_get_ptr(node, index, ncmax); |
Ryusuke Konishi | ea64ab8 | 2010-07-13 23:33:52 +0900 | [diff] [blame] | 581 | } else { |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 582 | WARN_ON(found || level != NILFS_BTREE_LEVEL_NODE_MIN); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 583 | /* insert */ |
| 584 | ptr = NILFS_BMAP_INVALID_PTR; |
| 585 | } |
| 586 | path[level].bp_index = index; |
| 587 | } |
| 588 | if (!found) |
| 589 | return -ENOENT; |
| 590 | |
| 591 | if (ptrp != NULL) |
| 592 | *ptrp = ptr; |
| 593 | |
| 594 | return 0; |
| 595 | } |
| 596 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 597 | static int nilfs_btree_do_lookup_last(const struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 598 | struct nilfs_btree_path *path, |
| 599 | __u64 *keyp, __u64 *ptrp) |
| 600 | { |
| 601 | struct nilfs_btree_node *node; |
| 602 | __u64 ptr; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 603 | int index, level, ncmax, ret; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 604 | |
| 605 | node = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 606 | index = nilfs_btree_node_get_nchildren(node) - 1; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 607 | if (index < 0) |
| 608 | return -ENOENT; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 609 | level = nilfs_btree_node_get_level(node); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 610 | ptr = nilfs_btree_node_get_ptr(node, index, |
| 611 | NILFS_BTREE_ROOT_NCHILDREN_MAX); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 612 | path[level].bp_bh = NULL; |
| 613 | path[level].bp_index = index; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 614 | ncmax = nilfs_btree_nchildren_per_block(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 615 | |
| 616 | for (level--; level > 0; level--) { |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 617 | ret = nilfs_btree_get_block(btree, ptr, &path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 618 | if (ret < 0) |
| 619 | return ret; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 620 | node = nilfs_btree_get_nonroot_node(path, level); |
Ryusuke Konishi | 9b945d5 | 2009-10-10 22:58:10 +0900 | [diff] [blame] | 621 | if (nilfs_btree_bad_node(node, level)) |
| 622 | return -EINVAL; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 623 | index = nilfs_btree_node_get_nchildren(node) - 1; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 624 | ptr = nilfs_btree_node_get_ptr(node, index, ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 625 | path[level].bp_index = index; |
| 626 | } |
| 627 | |
| 628 | if (keyp != NULL) |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 629 | *keyp = nilfs_btree_node_get_key(node, index); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 630 | if (ptrp != NULL) |
| 631 | *ptrp = ptr; |
| 632 | |
| 633 | return 0; |
| 634 | } |
| 635 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 636 | static int nilfs_btree_lookup(const struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 637 | __u64 key, int level, __u64 *ptrp) |
| 638 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 639 | struct nilfs_btree_path *path; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 640 | int ret; |
| 641 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 642 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 643 | if (path == NULL) |
| 644 | return -ENOMEM; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 645 | |
Ryusuke Konishi | 03bdb5a | 2010-07-18 10:42:26 +0900 | [diff] [blame] | 646 | ret = nilfs_btree_do_lookup(btree, path, key, ptrp, level, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 647 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 648 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 649 | |
| 650 | return ret; |
| 651 | } |
| 652 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 653 | static int nilfs_btree_lookup_contig(const struct nilfs_bmap *btree, |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 654 | __u64 key, __u64 *ptrp, unsigned maxblocks) |
| 655 | { |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 656 | struct nilfs_btree_path *path; |
| 657 | struct nilfs_btree_node *node; |
| 658 | struct inode *dat = NULL; |
| 659 | __u64 ptr, ptr2; |
| 660 | sector_t blocknr; |
| 661 | int level = NILFS_BTREE_LEVEL_NODE_MIN; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 662 | int ret, cnt, index, maxlevel, ncmax; |
Ryusuke Konishi | 03bdb5a | 2010-07-18 10:42:26 +0900 | [diff] [blame] | 663 | struct nilfs_btree_readahead_info p; |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 664 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 665 | path = nilfs_btree_alloc_path(); |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 666 | if (path == NULL) |
| 667 | return -ENOMEM; |
Li Hong | f905440 | 2010-04-02 17:36:34 +0800 | [diff] [blame] | 668 | |
Ryusuke Konishi | 03bdb5a | 2010-07-18 10:42:26 +0900 | [diff] [blame] | 669 | ret = nilfs_btree_do_lookup(btree, path, key, &ptr, level, 1); |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 670 | if (ret < 0) |
| 671 | goto out; |
| 672 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 673 | if (NILFS_BMAP_USE_VBN(btree)) { |
| 674 | dat = nilfs_bmap_get_dat(btree); |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 675 | ret = nilfs_dat_translate(dat, ptr, &blocknr); |
| 676 | if (ret < 0) |
| 677 | goto out; |
| 678 | ptr = blocknr; |
| 679 | } |
| 680 | cnt = 1; |
| 681 | if (cnt == maxblocks) |
| 682 | goto end; |
| 683 | |
| 684 | maxlevel = nilfs_btree_height(btree) - 1; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 685 | node = nilfs_btree_get_node(btree, path, level, &ncmax); |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 686 | index = path[level].bp_index + 1; |
| 687 | for (;;) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 688 | while (index < nilfs_btree_node_get_nchildren(node)) { |
| 689 | if (nilfs_btree_node_get_key(node, index) != |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 690 | key + cnt) |
| 691 | goto end; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 692 | ptr2 = nilfs_btree_node_get_ptr(node, index, ncmax); |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 693 | if (dat) { |
| 694 | ret = nilfs_dat_translate(dat, ptr2, &blocknr); |
| 695 | if (ret < 0) |
| 696 | goto out; |
| 697 | ptr2 = blocknr; |
| 698 | } |
| 699 | if (ptr2 != ptr + cnt || ++cnt == maxblocks) |
| 700 | goto end; |
| 701 | index++; |
| 702 | continue; |
| 703 | } |
| 704 | if (level == maxlevel) |
| 705 | break; |
| 706 | |
| 707 | /* look-up right sibling node */ |
Ryusuke Konishi | 03bdb5a | 2010-07-18 10:42:26 +0900 | [diff] [blame] | 708 | p.node = nilfs_btree_get_node(btree, path, level + 1, &p.ncmax); |
| 709 | p.index = path[level + 1].bp_index + 1; |
| 710 | p.max_ra_blocks = 7; |
| 711 | if (p.index >= nilfs_btree_node_get_nchildren(p.node) || |
| 712 | nilfs_btree_node_get_key(p.node, p.index) != key + cnt) |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 713 | break; |
Ryusuke Konishi | 03bdb5a | 2010-07-18 10:42:26 +0900 | [diff] [blame] | 714 | ptr2 = nilfs_btree_node_get_ptr(p.node, p.index, p.ncmax); |
| 715 | path[level + 1].bp_index = p.index; |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 716 | |
| 717 | brelse(path[level].bp_bh); |
| 718 | path[level].bp_bh = NULL; |
Ryusuke Konishi | 03bdb5a | 2010-07-18 10:42:26 +0900 | [diff] [blame] | 719 | |
| 720 | ret = __nilfs_btree_get_block(btree, ptr2, &path[level].bp_bh, |
| 721 | &p); |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 722 | if (ret < 0) |
| 723 | goto out; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 724 | node = nilfs_btree_get_nonroot_node(path, level); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 725 | ncmax = nilfs_btree_nchildren_per_block(btree); |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 726 | index = 0; |
| 727 | path[level].bp_index = index; |
| 728 | } |
| 729 | end: |
| 730 | *ptrp = ptr; |
| 731 | ret = cnt; |
| 732 | out: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 733 | nilfs_btree_free_path(path); |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 734 | return ret; |
| 735 | } |
| 736 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 737 | static void nilfs_btree_promote_key(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 738 | struct nilfs_btree_path *path, |
| 739 | int level, __u64 key) |
| 740 | { |
| 741 | if (level < nilfs_btree_height(btree) - 1) { |
| 742 | do { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 743 | nilfs_btree_node_set_key( |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 744 | nilfs_btree_get_nonroot_node(path, level), |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 745 | path[level].bp_index, key); |
| 746 | if (!buffer_dirty(path[level].bp_bh)) |
Ryusuke Konishi | 5fc7b14 | 2011-05-05 12:56:51 +0900 | [diff] [blame] | 747 | mark_buffer_dirty(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 748 | } while ((path[level].bp_index == 0) && |
| 749 | (++level < nilfs_btree_height(btree) - 1)); |
| 750 | } |
| 751 | |
| 752 | /* root */ |
| 753 | if (level == nilfs_btree_height(btree) - 1) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 754 | nilfs_btree_node_set_key(nilfs_btree_get_root(btree), |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 755 | path[level].bp_index, key); |
| 756 | } |
| 757 | } |
| 758 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 759 | static void nilfs_btree_do_insert(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 760 | struct nilfs_btree_path *path, |
| 761 | int level, __u64 *keyp, __u64 *ptrp) |
| 762 | { |
| 763 | struct nilfs_btree_node *node; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 764 | int ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 765 | |
| 766 | if (level < nilfs_btree_height(btree) - 1) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 767 | node = nilfs_btree_get_nonroot_node(path, level); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 768 | ncblk = nilfs_btree_nchildren_per_block(btree); |
| 769 | nilfs_btree_node_insert(node, path[level].bp_index, |
| 770 | *keyp, *ptrp, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 771 | if (!buffer_dirty(path[level].bp_bh)) |
Ryusuke Konishi | 5fc7b14 | 2011-05-05 12:56:51 +0900 | [diff] [blame] | 772 | mark_buffer_dirty(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 773 | |
| 774 | if (path[level].bp_index == 0) |
| 775 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 776 | nilfs_btree_node_get_key(node, |
| 777 | 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 778 | } else { |
| 779 | node = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 780 | nilfs_btree_node_insert(node, path[level].bp_index, |
| 781 | *keyp, *ptrp, |
| 782 | NILFS_BTREE_ROOT_NCHILDREN_MAX); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 783 | } |
| 784 | } |
| 785 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 786 | static void nilfs_btree_carry_left(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 787 | struct nilfs_btree_path *path, |
| 788 | int level, __u64 *keyp, __u64 *ptrp) |
| 789 | { |
| 790 | struct nilfs_btree_node *node, *left; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 791 | int nchildren, lnchildren, n, move, ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 792 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 793 | node = nilfs_btree_get_nonroot_node(path, level); |
| 794 | left = nilfs_btree_get_sib_node(path, level); |
| 795 | nchildren = nilfs_btree_node_get_nchildren(node); |
| 796 | lnchildren = nilfs_btree_node_get_nchildren(left); |
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 + lnchildren + 1) / 2 - lnchildren; |
| 801 | if (n > path[level].bp_index) { |
| 802 | /* move insert point */ |
| 803 | n--; |
| 804 | move = 1; |
| 805 | } |
| 806 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 807 | nilfs_btree_node_move_left(left, node, n, ncblk, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 808 | |
| 809 | if (!buffer_dirty(path[level].bp_bh)) |
Ryusuke Konishi | 5fc7b14 | 2011-05-05 12:56:51 +0900 | [diff] [blame] | 810 | mark_buffer_dirty(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 811 | if (!buffer_dirty(path[level].bp_sib_bh)) |
Ryusuke Konishi | 5fc7b14 | 2011-05-05 12:56:51 +0900 | [diff] [blame] | 812 | mark_buffer_dirty(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 813 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 814 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 815 | nilfs_btree_node_get_key(node, 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 816 | |
| 817 | if (move) { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 818 | brelse(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 819 | path[level].bp_bh = path[level].bp_sib_bh; |
| 820 | path[level].bp_sib_bh = NULL; |
| 821 | path[level].bp_index += lnchildren; |
| 822 | path[level + 1].bp_index--; |
| 823 | } else { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 824 | brelse(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 825 | path[level].bp_sib_bh = NULL; |
| 826 | path[level].bp_index -= n; |
| 827 | } |
| 828 | |
| 829 | nilfs_btree_do_insert(btree, path, level, keyp, ptrp); |
| 830 | } |
| 831 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 832 | static void nilfs_btree_carry_right(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 833 | struct nilfs_btree_path *path, |
| 834 | int level, __u64 *keyp, __u64 *ptrp) |
| 835 | { |
| 836 | struct nilfs_btree_node *node, *right; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 837 | int nchildren, rnchildren, n, move, ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 838 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 839 | node = nilfs_btree_get_nonroot_node(path, level); |
| 840 | right = nilfs_btree_get_sib_node(path, level); |
| 841 | nchildren = nilfs_btree_node_get_nchildren(node); |
| 842 | rnchildren = nilfs_btree_node_get_nchildren(right); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 843 | ncblk = nilfs_btree_nchildren_per_block(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 844 | move = 0; |
| 845 | |
| 846 | n = (nchildren + rnchildren + 1) / 2 - rnchildren; |
| 847 | if (n > nchildren - path[level].bp_index) { |
| 848 | /* move insert point */ |
| 849 | n--; |
| 850 | move = 1; |
| 851 | } |
| 852 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 853 | nilfs_btree_node_move_right(node, right, n, ncblk, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 854 | |
| 855 | if (!buffer_dirty(path[level].bp_bh)) |
Ryusuke Konishi | 5fc7b14 | 2011-05-05 12:56:51 +0900 | [diff] [blame] | 856 | mark_buffer_dirty(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 857 | if (!buffer_dirty(path[level].bp_sib_bh)) |
Ryusuke Konishi | 5fc7b14 | 2011-05-05 12:56:51 +0900 | [diff] [blame] | 858 | mark_buffer_dirty(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 859 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 860 | path[level + 1].bp_index++; |
| 861 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 862 | nilfs_btree_node_get_key(right, 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 863 | path[level + 1].bp_index--; |
| 864 | |
| 865 | if (move) { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 866 | brelse(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 867 | path[level].bp_bh = path[level].bp_sib_bh; |
| 868 | path[level].bp_sib_bh = NULL; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 869 | path[level].bp_index -= nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 870 | path[level + 1].bp_index++; |
| 871 | } else { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 872 | brelse(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 873 | path[level].bp_sib_bh = NULL; |
| 874 | } |
| 875 | |
| 876 | nilfs_btree_do_insert(btree, path, level, keyp, ptrp); |
| 877 | } |
| 878 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 879 | static void nilfs_btree_split(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 880 | struct nilfs_btree_path *path, |
| 881 | int level, __u64 *keyp, __u64 *ptrp) |
| 882 | { |
| 883 | struct nilfs_btree_node *node, *right; |
| 884 | __u64 newkey; |
| 885 | __u64 newptr; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 886 | int nchildren, n, move, ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 887 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 888 | node = nilfs_btree_get_nonroot_node(path, level); |
| 889 | right = nilfs_btree_get_sib_node(path, level); |
| 890 | nchildren = nilfs_btree_node_get_nchildren(node); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 891 | ncblk = nilfs_btree_nchildren_per_block(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 892 | move = 0; |
| 893 | |
| 894 | n = (nchildren + 1) / 2; |
| 895 | if (n > nchildren - path[level].bp_index) { |
| 896 | n--; |
| 897 | move = 1; |
| 898 | } |
| 899 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 900 | nilfs_btree_node_move_right(node, right, n, ncblk, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 901 | |
| 902 | if (!buffer_dirty(path[level].bp_bh)) |
Ryusuke Konishi | 5fc7b14 | 2011-05-05 12:56:51 +0900 | [diff] [blame] | 903 | mark_buffer_dirty(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 904 | if (!buffer_dirty(path[level].bp_sib_bh)) |
Ryusuke Konishi | 5fc7b14 | 2011-05-05 12:56:51 +0900 | [diff] [blame] | 905 | mark_buffer_dirty(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 906 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 907 | newkey = nilfs_btree_node_get_key(right, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 908 | newptr = path[level].bp_newreq.bpr_ptr; |
| 909 | |
| 910 | if (move) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 911 | path[level].bp_index -= nilfs_btree_node_get_nchildren(node); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 912 | nilfs_btree_node_insert(right, path[level].bp_index, |
| 913 | *keyp, *ptrp, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 914 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 915 | *keyp = nilfs_btree_node_get_key(right, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 916 | *ptrp = path[level].bp_newreq.bpr_ptr; |
| 917 | |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 918 | brelse(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 919 | path[level].bp_bh = path[level].bp_sib_bh; |
| 920 | path[level].bp_sib_bh = NULL; |
| 921 | } else { |
| 922 | nilfs_btree_do_insert(btree, path, level, keyp, ptrp); |
| 923 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 924 | *keyp = nilfs_btree_node_get_key(right, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 925 | *ptrp = path[level].bp_newreq.bpr_ptr; |
| 926 | |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 927 | brelse(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 928 | path[level].bp_sib_bh = NULL; |
| 929 | } |
| 930 | |
| 931 | path[level + 1].bp_index++; |
| 932 | } |
| 933 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 934 | static void nilfs_btree_grow(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 935 | struct nilfs_btree_path *path, |
| 936 | int level, __u64 *keyp, __u64 *ptrp) |
| 937 | { |
| 938 | struct nilfs_btree_node *root, *child; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 939 | int n, ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 940 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 941 | root = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 942 | child = nilfs_btree_get_sib_node(path, level); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 943 | ncblk = nilfs_btree_nchildren_per_block(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 944 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 945 | n = nilfs_btree_node_get_nchildren(root); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 946 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 947 | nilfs_btree_node_move_right(root, child, n, |
| 948 | NILFS_BTREE_ROOT_NCHILDREN_MAX, ncblk); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 949 | nilfs_btree_node_set_level(root, level + 1); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 950 | |
| 951 | if (!buffer_dirty(path[level].bp_sib_bh)) |
Ryusuke Konishi | 5fc7b14 | 2011-05-05 12:56:51 +0900 | [diff] [blame] | 952 | mark_buffer_dirty(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 953 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 954 | path[level].bp_bh = path[level].bp_sib_bh; |
| 955 | path[level].bp_sib_bh = NULL; |
| 956 | |
| 957 | nilfs_btree_do_insert(btree, path, level, keyp, ptrp); |
| 958 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 959 | *keyp = nilfs_btree_node_get_key(child, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 960 | *ptrp = path[level].bp_newreq.bpr_ptr; |
| 961 | } |
| 962 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 963 | static __u64 nilfs_btree_find_near(const struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 964 | const struct nilfs_btree_path *path) |
| 965 | { |
| 966 | struct nilfs_btree_node *node; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 967 | int level, ncmax; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 968 | |
| 969 | if (path == NULL) |
| 970 | return NILFS_BMAP_INVALID_PTR; |
| 971 | |
| 972 | /* left sibling */ |
| 973 | level = NILFS_BTREE_LEVEL_NODE_MIN; |
| 974 | if (path[level].bp_index > 0) { |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 975 | node = nilfs_btree_get_node(btree, path, level, &ncmax); |
| 976 | return nilfs_btree_node_get_ptr(node, |
| 977 | path[level].bp_index - 1, |
| 978 | ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 979 | } |
| 980 | |
| 981 | /* parent */ |
| 982 | level = NILFS_BTREE_LEVEL_NODE_MIN + 1; |
| 983 | if (level <= nilfs_btree_height(btree) - 1) { |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 984 | node = nilfs_btree_get_node(btree, path, level, &ncmax); |
| 985 | return nilfs_btree_node_get_ptr(node, path[level].bp_index, |
| 986 | ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 987 | } |
| 988 | |
| 989 | return NILFS_BMAP_INVALID_PTR; |
| 990 | } |
| 991 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 992 | static __u64 nilfs_btree_find_target_v(const struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 993 | const struct nilfs_btree_path *path, |
| 994 | __u64 key) |
| 995 | { |
| 996 | __u64 ptr; |
| 997 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 998 | ptr = nilfs_bmap_find_target_seq(btree, key); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 999 | if (ptr != NILFS_BMAP_INVALID_PTR) |
| 1000 | /* sequential access */ |
| 1001 | return ptr; |
| 1002 | else { |
| 1003 | ptr = nilfs_btree_find_near(btree, path); |
| 1004 | if (ptr != NILFS_BMAP_INVALID_PTR) |
| 1005 | /* near */ |
| 1006 | return ptr; |
| 1007 | } |
| 1008 | /* block group */ |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1009 | return nilfs_bmap_find_target_in_group(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1010 | } |
| 1011 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1012 | static int nilfs_btree_prepare_insert(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1013 | struct nilfs_btree_path *path, |
| 1014 | int *levelp, __u64 key, __u64 ptr, |
| 1015 | struct nilfs_bmap_stats *stats) |
| 1016 | { |
| 1017 | struct buffer_head *bh; |
| 1018 | struct nilfs_btree_node *node, *parent, *sib; |
| 1019 | __u64 sibptr; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1020 | int pindex, level, ncmax, ncblk, ret; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1021 | struct inode *dat = NULL; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1022 | |
| 1023 | stats->bs_nblocks = 0; |
| 1024 | level = NILFS_BTREE_LEVEL_DATA; |
| 1025 | |
| 1026 | /* allocate a new ptr for data block */ |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1027 | if (NILFS_BMAP_USE_VBN(btree)) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1028 | path[level].bp_newreq.bpr_ptr = |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 1029 | nilfs_btree_find_target_v(btree, path, key); |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1030 | dat = nilfs_bmap_get_dat(btree); |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1031 | } |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1032 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1033 | ret = nilfs_bmap_prepare_alloc_ptr(btree, &path[level].bp_newreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1034 | if (ret < 0) |
| 1035 | goto err_out_data; |
| 1036 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1037 | ncblk = nilfs_btree_nchildren_per_block(btree); |
Ryusuke Konishi | ea64ab8 | 2010-07-13 23:33:52 +0900 | [diff] [blame] | 1038 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1039 | for (level = NILFS_BTREE_LEVEL_NODE_MIN; |
| 1040 | level < nilfs_btree_height(btree) - 1; |
| 1041 | level++) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1042 | node = nilfs_btree_get_nonroot_node(path, level); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1043 | if (nilfs_btree_node_get_nchildren(node) < ncblk) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1044 | path[level].bp_op = nilfs_btree_do_insert; |
| 1045 | stats->bs_nblocks++; |
| 1046 | goto out; |
| 1047 | } |
| 1048 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1049 | parent = nilfs_btree_get_node(btree, path, level + 1, &ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1050 | pindex = path[level + 1].bp_index; |
| 1051 | |
| 1052 | /* left sibling */ |
| 1053 | if (pindex > 0) { |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1054 | sibptr = nilfs_btree_node_get_ptr(parent, pindex - 1, |
| 1055 | ncmax); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1056 | ret = nilfs_btree_get_block(btree, sibptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1057 | if (ret < 0) |
| 1058 | goto err_out_child_node; |
| 1059 | sib = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1060 | if (nilfs_btree_node_get_nchildren(sib) < ncblk) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1061 | path[level].bp_sib_bh = bh; |
| 1062 | path[level].bp_op = nilfs_btree_carry_left; |
| 1063 | stats->bs_nblocks++; |
| 1064 | goto out; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1065 | } else { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1066 | brelse(bh); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1067 | } |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1068 | } |
| 1069 | |
| 1070 | /* right sibling */ |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1071 | if (pindex < nilfs_btree_node_get_nchildren(parent) - 1) { |
| 1072 | sibptr = nilfs_btree_node_get_ptr(parent, pindex + 1, |
| 1073 | ncmax); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1074 | ret = nilfs_btree_get_block(btree, sibptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1075 | if (ret < 0) |
| 1076 | goto err_out_child_node; |
| 1077 | sib = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1078 | if (nilfs_btree_node_get_nchildren(sib) < ncblk) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1079 | path[level].bp_sib_bh = bh; |
| 1080 | path[level].bp_op = nilfs_btree_carry_right; |
| 1081 | stats->bs_nblocks++; |
| 1082 | goto out; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1083 | } else { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1084 | brelse(bh); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1085 | } |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1086 | } |
| 1087 | |
| 1088 | /* split */ |
| 1089 | path[level].bp_newreq.bpr_ptr = |
| 1090 | path[level - 1].bp_newreq.bpr_ptr + 1; |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1091 | ret = nilfs_bmap_prepare_alloc_ptr(btree, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1092 | &path[level].bp_newreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1093 | if (ret < 0) |
| 1094 | goto err_out_child_node; |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1095 | ret = nilfs_btree_get_new_block(btree, |
| 1096 | path[level].bp_newreq.bpr_ptr, |
| 1097 | &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1098 | if (ret < 0) |
| 1099 | goto err_out_curr_node; |
| 1100 | |
| 1101 | stats->bs_nblocks++; |
| 1102 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1103 | sib = (struct nilfs_btree_node *)bh->b_data; |
| 1104 | nilfs_btree_node_init(sib, 0, level, 0, ncblk, NULL, NULL); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1105 | path[level].bp_sib_bh = bh; |
| 1106 | path[level].bp_op = nilfs_btree_split; |
| 1107 | } |
| 1108 | |
| 1109 | /* root */ |
| 1110 | node = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1111 | if (nilfs_btree_node_get_nchildren(node) < |
Ryusuke Konishi | ea64ab8 | 2010-07-13 23:33:52 +0900 | [diff] [blame] | 1112 | NILFS_BTREE_ROOT_NCHILDREN_MAX) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1113 | path[level].bp_op = nilfs_btree_do_insert; |
| 1114 | stats->bs_nblocks++; |
| 1115 | goto out; |
| 1116 | } |
| 1117 | |
| 1118 | /* grow */ |
| 1119 | 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] | 1120 | ret = nilfs_bmap_prepare_alloc_ptr(btree, &path[level].bp_newreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1121 | if (ret < 0) |
| 1122 | goto err_out_child_node; |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1123 | ret = nilfs_btree_get_new_block(btree, path[level].bp_newreq.bpr_ptr, |
| 1124 | &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1125 | if (ret < 0) |
| 1126 | goto err_out_curr_node; |
| 1127 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1128 | nilfs_btree_node_init((struct nilfs_btree_node *)bh->b_data, |
| 1129 | 0, level, 0, ncblk, NULL, NULL); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1130 | path[level].bp_sib_bh = bh; |
| 1131 | path[level].bp_op = nilfs_btree_grow; |
| 1132 | |
| 1133 | level++; |
| 1134 | path[level].bp_op = nilfs_btree_do_insert; |
| 1135 | |
| 1136 | /* a newly-created node block and a data block are added */ |
| 1137 | stats->bs_nblocks += 2; |
| 1138 | |
| 1139 | /* success */ |
| 1140 | out: |
| 1141 | *levelp = level; |
| 1142 | return ret; |
| 1143 | |
| 1144 | /* error */ |
| 1145 | err_out_curr_node: |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1146 | nilfs_bmap_abort_alloc_ptr(btree, &path[level].bp_newreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1147 | err_out_child_node: |
| 1148 | for (level--; level > NILFS_BTREE_LEVEL_DATA; level--) { |
Ryusuke Konishi | 9f09890 | 2009-05-22 00:38:56 +0900 | [diff] [blame] | 1149 | nilfs_btnode_delete(path[level].bp_sib_bh); |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1150 | nilfs_bmap_abort_alloc_ptr(btree, &path[level].bp_newreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1151 | |
| 1152 | } |
| 1153 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1154 | nilfs_bmap_abort_alloc_ptr(btree, &path[level].bp_newreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1155 | err_out_data: |
| 1156 | *levelp = level; |
| 1157 | stats->bs_nblocks = 0; |
| 1158 | return ret; |
| 1159 | } |
| 1160 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1161 | static void nilfs_btree_commit_insert(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1162 | struct nilfs_btree_path *path, |
| 1163 | int maxlevel, __u64 key, __u64 ptr) |
| 1164 | { |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1165 | struct inode *dat = NULL; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1166 | int level; |
| 1167 | |
| 1168 | set_buffer_nilfs_volatile((struct buffer_head *)((unsigned long)ptr)); |
| 1169 | ptr = path[NILFS_BTREE_LEVEL_DATA].bp_newreq.bpr_ptr; |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1170 | if (NILFS_BMAP_USE_VBN(btree)) { |
Ryusuke Konishi | dc935be | 2010-07-10 22:21:54 +0900 | [diff] [blame] | 1171 | nilfs_bmap_set_target_v(btree, key, ptr); |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1172 | dat = nilfs_bmap_get_dat(btree); |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1173 | } |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1174 | |
| 1175 | for (level = NILFS_BTREE_LEVEL_NODE_MIN; level <= maxlevel; level++) { |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1176 | nilfs_bmap_commit_alloc_ptr(btree, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1177 | &path[level - 1].bp_newreq, dat); |
Pekka Enberg | 8acfbf0 | 2009-04-06 19:01:49 -0700 | [diff] [blame] | 1178 | path[level].bp_op(btree, path, level, &key, &ptr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1179 | } |
| 1180 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1181 | if (!nilfs_bmap_dirty(btree)) |
| 1182 | nilfs_bmap_set_dirty(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1183 | } |
| 1184 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1185 | 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] | 1186 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1187 | struct nilfs_btree_path *path; |
| 1188 | struct nilfs_bmap_stats stats; |
| 1189 | int level, ret; |
| 1190 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1191 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1192 | if (path == NULL) |
| 1193 | return -ENOMEM; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1194 | |
| 1195 | ret = nilfs_btree_do_lookup(btree, path, key, NULL, |
Ryusuke Konishi | 03bdb5a | 2010-07-18 10:42:26 +0900 | [diff] [blame] | 1196 | NILFS_BTREE_LEVEL_NODE_MIN, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1197 | if (ret != -ENOENT) { |
| 1198 | if (ret == 0) |
| 1199 | ret = -EEXIST; |
| 1200 | goto out; |
| 1201 | } |
| 1202 | |
| 1203 | ret = nilfs_btree_prepare_insert(btree, path, &level, key, ptr, &stats); |
| 1204 | if (ret < 0) |
| 1205 | goto out; |
| 1206 | nilfs_btree_commit_insert(btree, path, level, key, ptr); |
Ryusuke Konishi | be66737 | 2011-03-05 00:19:32 +0900 | [diff] [blame] | 1207 | nilfs_inode_add_blocks(btree->b_inode, stats.bs_nblocks); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1208 | |
| 1209 | out: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1210 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1211 | return ret; |
| 1212 | } |
| 1213 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1214 | static void nilfs_btree_do_delete(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1215 | struct nilfs_btree_path *path, |
| 1216 | int level, __u64 *keyp, __u64 *ptrp) |
| 1217 | { |
| 1218 | struct nilfs_btree_node *node; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1219 | int ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1220 | |
| 1221 | if (level < nilfs_btree_height(btree) - 1) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1222 | node = nilfs_btree_get_nonroot_node(path, level); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1223 | ncblk = nilfs_btree_nchildren_per_block(btree); |
| 1224 | nilfs_btree_node_delete(node, path[level].bp_index, |
| 1225 | keyp, ptrp, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1226 | if (!buffer_dirty(path[level].bp_bh)) |
Ryusuke Konishi | 5fc7b14 | 2011-05-05 12:56:51 +0900 | [diff] [blame] | 1227 | mark_buffer_dirty(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1228 | if (path[level].bp_index == 0) |
| 1229 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1230 | nilfs_btree_node_get_key(node, 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1231 | } else { |
| 1232 | node = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1233 | nilfs_btree_node_delete(node, path[level].bp_index, |
| 1234 | keyp, ptrp, |
| 1235 | NILFS_BTREE_ROOT_NCHILDREN_MAX); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1236 | } |
| 1237 | } |
| 1238 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1239 | static void nilfs_btree_borrow_left(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1240 | struct nilfs_btree_path *path, |
| 1241 | int level, __u64 *keyp, __u64 *ptrp) |
| 1242 | { |
| 1243 | struct nilfs_btree_node *node, *left; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1244 | int nchildren, lnchildren, n, ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1245 | |
| 1246 | nilfs_btree_do_delete(btree, path, level, keyp, ptrp); |
| 1247 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1248 | node = nilfs_btree_get_nonroot_node(path, level); |
| 1249 | left = nilfs_btree_get_sib_node(path, level); |
| 1250 | nchildren = nilfs_btree_node_get_nchildren(node); |
| 1251 | lnchildren = nilfs_btree_node_get_nchildren(left); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1252 | ncblk = nilfs_btree_nchildren_per_block(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1253 | |
| 1254 | n = (nchildren + lnchildren) / 2 - nchildren; |
| 1255 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1256 | nilfs_btree_node_move_right(left, node, n, ncblk, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1257 | |
| 1258 | if (!buffer_dirty(path[level].bp_bh)) |
Ryusuke Konishi | 5fc7b14 | 2011-05-05 12:56:51 +0900 | [diff] [blame] | 1259 | mark_buffer_dirty(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1260 | if (!buffer_dirty(path[level].bp_sib_bh)) |
Ryusuke Konishi | 5fc7b14 | 2011-05-05 12:56:51 +0900 | [diff] [blame] | 1261 | mark_buffer_dirty(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1262 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1263 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1264 | nilfs_btree_node_get_key(node, 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1265 | |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1266 | brelse(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1267 | path[level].bp_sib_bh = NULL; |
| 1268 | path[level].bp_index += n; |
| 1269 | } |
| 1270 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1271 | static void nilfs_btree_borrow_right(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1272 | struct nilfs_btree_path *path, |
| 1273 | int level, __u64 *keyp, __u64 *ptrp) |
| 1274 | { |
| 1275 | struct nilfs_btree_node *node, *right; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1276 | int nchildren, rnchildren, n, ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1277 | |
| 1278 | nilfs_btree_do_delete(btree, path, level, keyp, ptrp); |
| 1279 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1280 | node = nilfs_btree_get_nonroot_node(path, level); |
| 1281 | right = nilfs_btree_get_sib_node(path, level); |
| 1282 | nchildren = nilfs_btree_node_get_nchildren(node); |
| 1283 | rnchildren = nilfs_btree_node_get_nchildren(right); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1284 | ncblk = nilfs_btree_nchildren_per_block(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1285 | |
| 1286 | n = (nchildren + rnchildren) / 2 - nchildren; |
| 1287 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1288 | nilfs_btree_node_move_left(node, right, n, ncblk, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1289 | |
| 1290 | if (!buffer_dirty(path[level].bp_bh)) |
Ryusuke Konishi | 5fc7b14 | 2011-05-05 12:56:51 +0900 | [diff] [blame] | 1291 | mark_buffer_dirty(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1292 | if (!buffer_dirty(path[level].bp_sib_bh)) |
Ryusuke Konishi | 5fc7b14 | 2011-05-05 12:56:51 +0900 | [diff] [blame] | 1293 | mark_buffer_dirty(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1294 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1295 | path[level + 1].bp_index++; |
| 1296 | nilfs_btree_promote_key(btree, path, level + 1, |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1297 | nilfs_btree_node_get_key(right, 0)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1298 | path[level + 1].bp_index--; |
| 1299 | |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1300 | brelse(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1301 | path[level].bp_sib_bh = NULL; |
| 1302 | } |
| 1303 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1304 | static void nilfs_btree_concat_left(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1305 | struct nilfs_btree_path *path, |
| 1306 | int level, __u64 *keyp, __u64 *ptrp) |
| 1307 | { |
| 1308 | struct nilfs_btree_node *node, *left; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1309 | int n, ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1310 | |
| 1311 | nilfs_btree_do_delete(btree, path, level, keyp, ptrp); |
| 1312 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1313 | node = nilfs_btree_get_nonroot_node(path, level); |
| 1314 | left = nilfs_btree_get_sib_node(path, level); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1315 | ncblk = nilfs_btree_nchildren_per_block(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1316 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1317 | n = nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1318 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1319 | nilfs_btree_node_move_left(left, node, n, ncblk, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1320 | |
| 1321 | if (!buffer_dirty(path[level].bp_sib_bh)) |
Ryusuke Konishi | 5fc7b14 | 2011-05-05 12:56:51 +0900 | [diff] [blame] | 1322 | mark_buffer_dirty(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1323 | |
Ryusuke Konishi | 9f09890 | 2009-05-22 00:38:56 +0900 | [diff] [blame] | 1324 | nilfs_btnode_delete(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1325 | path[level].bp_bh = path[level].bp_sib_bh; |
| 1326 | path[level].bp_sib_bh = NULL; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1327 | path[level].bp_index += nilfs_btree_node_get_nchildren(left); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1328 | } |
| 1329 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1330 | static void nilfs_btree_concat_right(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1331 | struct nilfs_btree_path *path, |
| 1332 | int level, __u64 *keyp, __u64 *ptrp) |
| 1333 | { |
| 1334 | struct nilfs_btree_node *node, *right; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1335 | int n, ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1336 | |
| 1337 | nilfs_btree_do_delete(btree, path, level, keyp, ptrp); |
| 1338 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1339 | node = nilfs_btree_get_nonroot_node(path, level); |
| 1340 | right = nilfs_btree_get_sib_node(path, level); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1341 | ncblk = nilfs_btree_nchildren_per_block(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1342 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1343 | n = nilfs_btree_node_get_nchildren(right); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1344 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1345 | nilfs_btree_node_move_left(node, right, n, ncblk, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1346 | |
| 1347 | if (!buffer_dirty(path[level].bp_bh)) |
Ryusuke Konishi | 5fc7b14 | 2011-05-05 12:56:51 +0900 | [diff] [blame] | 1348 | mark_buffer_dirty(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1349 | |
Ryusuke Konishi | 9f09890 | 2009-05-22 00:38:56 +0900 | [diff] [blame] | 1350 | nilfs_btnode_delete(path[level].bp_sib_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1351 | path[level].bp_sib_bh = NULL; |
| 1352 | path[level + 1].bp_index++; |
| 1353 | } |
| 1354 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1355 | static void nilfs_btree_shrink(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1356 | struct nilfs_btree_path *path, |
| 1357 | int level, __u64 *keyp, __u64 *ptrp) |
| 1358 | { |
| 1359 | struct nilfs_btree_node *root, *child; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1360 | int n, ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1361 | |
| 1362 | nilfs_btree_do_delete(btree, path, level, keyp, ptrp); |
| 1363 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1364 | root = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1365 | child = nilfs_btree_get_nonroot_node(path, level); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1366 | ncblk = nilfs_btree_nchildren_per_block(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1367 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1368 | nilfs_btree_node_delete(root, 0, NULL, NULL, |
| 1369 | NILFS_BTREE_ROOT_NCHILDREN_MAX); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1370 | nilfs_btree_node_set_level(root, level); |
| 1371 | n = nilfs_btree_node_get_nchildren(child); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1372 | nilfs_btree_node_move_left(root, child, n, |
| 1373 | NILFS_BTREE_ROOT_NCHILDREN_MAX, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1374 | |
Ryusuke Konishi | 9f09890 | 2009-05-22 00:38:56 +0900 | [diff] [blame] | 1375 | nilfs_btnode_delete(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1376 | path[level].bp_bh = NULL; |
| 1377 | } |
| 1378 | |
Ryusuke Konishi | d409905 | 2011-05-25 23:00:27 +0900 | [diff] [blame] | 1379 | static void nilfs_btree_nop(struct nilfs_bmap *btree, |
| 1380 | struct nilfs_btree_path *path, |
| 1381 | int level, __u64 *keyp, __u64 *ptrp) |
| 1382 | { |
| 1383 | } |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1384 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1385 | static int nilfs_btree_prepare_delete(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1386 | struct nilfs_btree_path *path, |
| 1387 | int *levelp, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1388 | struct nilfs_bmap_stats *stats, |
| 1389 | struct inode *dat) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1390 | { |
| 1391 | struct buffer_head *bh; |
| 1392 | struct nilfs_btree_node *node, *parent, *sib; |
| 1393 | __u64 sibptr; |
Ryusuke Konishi | fe744fd | 2011-05-25 23:00:27 +0900 | [diff] [blame] | 1394 | int pindex, dindex, level, ncmin, ncmax, ncblk, ret; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1395 | |
| 1396 | ret = 0; |
| 1397 | stats->bs_nblocks = 0; |
Ryusuke Konishi | ea64ab8 | 2010-07-13 23:33:52 +0900 | [diff] [blame] | 1398 | ncmin = NILFS_BTREE_NODE_NCHILDREN_MIN(nilfs_btree_node_size(btree)); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1399 | ncblk = nilfs_btree_nchildren_per_block(btree); |
Ryusuke Konishi | ea64ab8 | 2010-07-13 23:33:52 +0900 | [diff] [blame] | 1400 | |
Ryusuke Konishi | fe744fd | 2011-05-25 23:00:27 +0900 | [diff] [blame] | 1401 | for (level = NILFS_BTREE_LEVEL_NODE_MIN, dindex = path[level].bp_index; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1402 | level < nilfs_btree_height(btree) - 1; |
| 1403 | level++) { |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1404 | node = nilfs_btree_get_nonroot_node(path, level); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1405 | path[level].bp_oldreq.bpr_ptr = |
Ryusuke Konishi | fe744fd | 2011-05-25 23:00:27 +0900 | [diff] [blame] | 1406 | nilfs_btree_node_get_ptr(node, dindex, ncblk); |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1407 | ret = nilfs_bmap_prepare_end_ptr(btree, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1408 | &path[level].bp_oldreq, dat); |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1409 | if (ret < 0) |
| 1410 | goto err_out_child_node; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1411 | |
Ryusuke Konishi | ea64ab8 | 2010-07-13 23:33:52 +0900 | [diff] [blame] | 1412 | if (nilfs_btree_node_get_nchildren(node) > ncmin) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1413 | path[level].bp_op = nilfs_btree_do_delete; |
| 1414 | stats->bs_nblocks++; |
| 1415 | goto out; |
| 1416 | } |
| 1417 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1418 | parent = nilfs_btree_get_node(btree, path, level + 1, &ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1419 | pindex = path[level + 1].bp_index; |
Ryusuke Konishi | fe744fd | 2011-05-25 23:00:27 +0900 | [diff] [blame] | 1420 | dindex = pindex; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1421 | |
| 1422 | if (pindex > 0) { |
| 1423 | /* left sibling */ |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1424 | sibptr = nilfs_btree_node_get_ptr(parent, pindex - 1, |
| 1425 | ncmax); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1426 | ret = nilfs_btree_get_block(btree, sibptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1427 | if (ret < 0) |
| 1428 | goto err_out_curr_node; |
| 1429 | sib = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | ea64ab8 | 2010-07-13 23:33:52 +0900 | [diff] [blame] | 1430 | if (nilfs_btree_node_get_nchildren(sib) > ncmin) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1431 | path[level].bp_sib_bh = bh; |
| 1432 | path[level].bp_op = nilfs_btree_borrow_left; |
| 1433 | stats->bs_nblocks++; |
| 1434 | goto out; |
| 1435 | } else { |
| 1436 | path[level].bp_sib_bh = bh; |
| 1437 | path[level].bp_op = nilfs_btree_concat_left; |
| 1438 | stats->bs_nblocks++; |
| 1439 | /* continue; */ |
| 1440 | } |
| 1441 | } else if (pindex < |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1442 | nilfs_btree_node_get_nchildren(parent) - 1) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1443 | /* right sibling */ |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1444 | sibptr = nilfs_btree_node_get_ptr(parent, pindex + 1, |
| 1445 | ncmax); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1446 | ret = nilfs_btree_get_block(btree, sibptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1447 | if (ret < 0) |
| 1448 | goto err_out_curr_node; |
| 1449 | sib = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | ea64ab8 | 2010-07-13 23:33:52 +0900 | [diff] [blame] | 1450 | if (nilfs_btree_node_get_nchildren(sib) > ncmin) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1451 | path[level].bp_sib_bh = bh; |
| 1452 | path[level].bp_op = nilfs_btree_borrow_right; |
| 1453 | stats->bs_nblocks++; |
| 1454 | goto out; |
| 1455 | } else { |
| 1456 | path[level].bp_sib_bh = bh; |
| 1457 | path[level].bp_op = nilfs_btree_concat_right; |
| 1458 | stats->bs_nblocks++; |
Ryusuke Konishi | fe744fd | 2011-05-25 23:00:27 +0900 | [diff] [blame] | 1459 | /* |
| 1460 | * When merging right sibling node |
| 1461 | * into the current node, pointer to |
| 1462 | * the right sibling node must be |
| 1463 | * terminated instead. The adjustment |
| 1464 | * below is required for that. |
| 1465 | */ |
| 1466 | dindex = pindex + 1; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1467 | /* continue; */ |
| 1468 | } |
| 1469 | } else { |
| 1470 | /* no siblings */ |
| 1471 | /* the only child of the root node */ |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1472 | WARN_ON(level != nilfs_btree_height(btree) - 2); |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1473 | if (nilfs_btree_node_get_nchildren(node) - 1 <= |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1474 | NILFS_BTREE_ROOT_NCHILDREN_MAX) { |
| 1475 | path[level].bp_op = nilfs_btree_shrink; |
| 1476 | stats->bs_nblocks += 2; |
Ryusuke Konishi | d409905 | 2011-05-25 23:00:27 +0900 | [diff] [blame] | 1477 | level++; |
| 1478 | path[level].bp_op = nilfs_btree_nop; |
| 1479 | goto shrink_root_child; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1480 | } else { |
| 1481 | path[level].bp_op = nilfs_btree_do_delete; |
| 1482 | stats->bs_nblocks++; |
Ryusuke Konishi | d409905 | 2011-05-25 23:00:27 +0900 | [diff] [blame] | 1483 | goto out; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1484 | } |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1485 | } |
| 1486 | } |
| 1487 | |
Ryusuke Konishi | d409905 | 2011-05-25 23:00:27 +0900 | [diff] [blame] | 1488 | /* child of the root node is deleted */ |
| 1489 | path[level].bp_op = nilfs_btree_do_delete; |
| 1490 | stats->bs_nblocks++; |
| 1491 | |
| 1492 | shrink_root_child: |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1493 | node = nilfs_btree_get_root(btree); |
| 1494 | path[level].bp_oldreq.bpr_ptr = |
Ryusuke Konishi | fe744fd | 2011-05-25 23:00:27 +0900 | [diff] [blame] | 1495 | nilfs_btree_node_get_ptr(node, dindex, |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1496 | NILFS_BTREE_ROOT_NCHILDREN_MAX); |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1497 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1498 | ret = nilfs_bmap_prepare_end_ptr(btree, &path[level].bp_oldreq, dat); |
Ryusuke Konishi | d4b9615 | 2009-05-24 03:25:44 +0900 | [diff] [blame] | 1499 | if (ret < 0) |
| 1500 | goto err_out_child_node; |
| 1501 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1502 | /* success */ |
| 1503 | out: |
| 1504 | *levelp = level; |
| 1505 | return ret; |
| 1506 | |
| 1507 | /* error */ |
| 1508 | err_out_curr_node: |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1509 | nilfs_bmap_abort_end_ptr(btree, &path[level].bp_oldreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1510 | err_out_child_node: |
| 1511 | for (level--; level >= NILFS_BTREE_LEVEL_NODE_MIN; level--) { |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1512 | brelse(path[level].bp_sib_bh); |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1513 | nilfs_bmap_abort_end_ptr(btree, &path[level].bp_oldreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1514 | } |
| 1515 | *levelp = level; |
| 1516 | stats->bs_nblocks = 0; |
| 1517 | return ret; |
| 1518 | } |
| 1519 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1520 | static void nilfs_btree_commit_delete(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1521 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1522 | int maxlevel, struct inode *dat) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1523 | { |
| 1524 | int level; |
| 1525 | |
| 1526 | for (level = NILFS_BTREE_LEVEL_NODE_MIN; level <= maxlevel; level++) { |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1527 | nilfs_bmap_commit_end_ptr(btree, &path[level].bp_oldreq, dat); |
Pekka Enberg | 8acfbf0 | 2009-04-06 19:01:49 -0700 | [diff] [blame] | 1528 | path[level].bp_op(btree, path, level, NULL, NULL); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1529 | } |
| 1530 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1531 | if (!nilfs_bmap_dirty(btree)) |
| 1532 | nilfs_bmap_set_dirty(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1533 | } |
| 1534 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1535 | static int nilfs_btree_delete(struct nilfs_bmap *btree, __u64 key) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1536 | |
| 1537 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1538 | struct nilfs_btree_path *path; |
| 1539 | struct nilfs_bmap_stats stats; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1540 | struct inode *dat; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1541 | int level, ret; |
| 1542 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1543 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1544 | if (path == NULL) |
| 1545 | return -ENOMEM; |
Li Hong | f905440 | 2010-04-02 17:36:34 +0800 | [diff] [blame] | 1546 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1547 | ret = nilfs_btree_do_lookup(btree, path, key, NULL, |
Ryusuke Konishi | 03bdb5a | 2010-07-18 10:42:26 +0900 | [diff] [blame] | 1548 | NILFS_BTREE_LEVEL_NODE_MIN, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1549 | if (ret < 0) |
| 1550 | goto out; |
| 1551 | |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1552 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1553 | dat = NILFS_BMAP_USE_VBN(btree) ? nilfs_bmap_get_dat(btree) : NULL; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1554 | |
| 1555 | ret = nilfs_btree_prepare_delete(btree, path, &level, &stats, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1556 | if (ret < 0) |
| 1557 | goto out; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1558 | nilfs_btree_commit_delete(btree, path, level, dat); |
Ryusuke Konishi | be66737 | 2011-03-05 00:19:32 +0900 | [diff] [blame] | 1559 | nilfs_inode_sub_blocks(btree->b_inode, stats.bs_nblocks); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1560 | |
| 1561 | out: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1562 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1563 | return ret; |
| 1564 | } |
| 1565 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1566 | 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] | 1567 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1568 | struct nilfs_btree_path *path; |
| 1569 | int ret; |
| 1570 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1571 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1572 | if (path == NULL) |
| 1573 | return -ENOMEM; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1574 | |
| 1575 | ret = nilfs_btree_do_lookup_last(btree, path, keyp, NULL); |
| 1576 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1577 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1578 | |
| 1579 | return ret; |
| 1580 | } |
| 1581 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1582 | static int nilfs_btree_check_delete(struct nilfs_bmap *btree, __u64 key) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1583 | { |
| 1584 | struct buffer_head *bh; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1585 | struct nilfs_btree_node *root, *node; |
| 1586 | __u64 maxkey, nextmaxkey; |
| 1587 | __u64 ptr; |
| 1588 | int nchildren, ret; |
| 1589 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1590 | root = nilfs_btree_get_root(btree); |
| 1591 | switch (nilfs_btree_height(btree)) { |
| 1592 | case 2: |
| 1593 | bh = NULL; |
| 1594 | node = root; |
| 1595 | break; |
| 1596 | case 3: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1597 | nchildren = nilfs_btree_node_get_nchildren(root); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1598 | if (nchildren > 1) |
| 1599 | return 0; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1600 | ptr = nilfs_btree_node_get_ptr(root, nchildren - 1, |
| 1601 | NILFS_BTREE_ROOT_NCHILDREN_MAX); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1602 | ret = nilfs_btree_get_block(btree, ptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1603 | if (ret < 0) |
| 1604 | return ret; |
| 1605 | node = (struct nilfs_btree_node *)bh->b_data; |
| 1606 | break; |
| 1607 | default: |
| 1608 | return 0; |
| 1609 | } |
| 1610 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1611 | nchildren = nilfs_btree_node_get_nchildren(node); |
| 1612 | maxkey = nilfs_btree_node_get_key(node, nchildren - 1); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1613 | nextmaxkey = (nchildren > 1) ? |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1614 | nilfs_btree_node_get_key(node, nchildren - 2) : 0; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1615 | if (bh != NULL) |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1616 | brelse(bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1617 | |
Ryusuke Konishi | 3033342 | 2009-05-24 00:09:44 +0900 | [diff] [blame] | 1618 | return (maxkey == key) && (nextmaxkey < NILFS_BMAP_LARGE_LOW); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1619 | } |
| 1620 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1621 | static int nilfs_btree_gather_data(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1622 | __u64 *keys, __u64 *ptrs, int nitems) |
| 1623 | { |
| 1624 | struct buffer_head *bh; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1625 | struct nilfs_btree_node *node, *root; |
| 1626 | __le64 *dkeys; |
| 1627 | __le64 *dptrs; |
| 1628 | __u64 ptr; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1629 | int nchildren, ncmax, i, ret; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1630 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1631 | root = nilfs_btree_get_root(btree); |
| 1632 | switch (nilfs_btree_height(btree)) { |
| 1633 | case 2: |
| 1634 | bh = NULL; |
| 1635 | node = root; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1636 | ncmax = NILFS_BTREE_ROOT_NCHILDREN_MAX; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1637 | break; |
| 1638 | case 3: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1639 | nchildren = nilfs_btree_node_get_nchildren(root); |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1640 | WARN_ON(nchildren > 1); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1641 | ptr = nilfs_btree_node_get_ptr(root, nchildren - 1, |
| 1642 | NILFS_BTREE_ROOT_NCHILDREN_MAX); |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1643 | ret = nilfs_btree_get_block(btree, ptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1644 | if (ret < 0) |
| 1645 | return ret; |
| 1646 | node = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1647 | ncmax = nilfs_btree_nchildren_per_block(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1648 | break; |
| 1649 | default: |
| 1650 | node = NULL; |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1651 | return -EINVAL; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1652 | } |
| 1653 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1654 | nchildren = nilfs_btree_node_get_nchildren(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1655 | if (nchildren < nitems) |
| 1656 | nitems = nchildren; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 1657 | dkeys = nilfs_btree_node_dkeys(node); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1658 | dptrs = nilfs_btree_node_dptrs(node, ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1659 | for (i = 0; i < nitems; i++) { |
Ryusuke Konishi | 25b8d7d | 2010-07-10 16:50:41 +0900 | [diff] [blame] | 1660 | keys[i] = le64_to_cpu(dkeys[i]); |
| 1661 | ptrs[i] = le64_to_cpu(dptrs[i]); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1662 | } |
| 1663 | |
| 1664 | if (bh != NULL) |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1665 | brelse(bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1666 | |
| 1667 | return nitems; |
| 1668 | } |
| 1669 | |
| 1670 | static int |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1671 | nilfs_btree_prepare_convert_and_insert(struct nilfs_bmap *btree, __u64 key, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1672 | union nilfs_bmap_ptr_req *dreq, |
| 1673 | union nilfs_bmap_ptr_req *nreq, |
| 1674 | struct buffer_head **bhp, |
| 1675 | struct nilfs_bmap_stats *stats) |
| 1676 | { |
| 1677 | struct buffer_head *bh; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1678 | struct inode *dat = NULL; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1679 | int ret; |
| 1680 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1681 | stats->bs_nblocks = 0; |
| 1682 | |
| 1683 | /* for data */ |
| 1684 | /* cannot find near ptr */ |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1685 | if (NILFS_BMAP_USE_VBN(btree)) { |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 1686 | dreq->bpr_ptr = nilfs_btree_find_target_v(btree, NULL, key); |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1687 | dat = nilfs_bmap_get_dat(btree); |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1688 | } |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 1689 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1690 | ret = nilfs_bmap_prepare_alloc_ptr(btree, dreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1691 | if (ret < 0) |
| 1692 | return ret; |
| 1693 | |
| 1694 | *bhp = NULL; |
| 1695 | stats->bs_nblocks++; |
| 1696 | if (nreq != NULL) { |
| 1697 | nreq->bpr_ptr = dreq->bpr_ptr + 1; |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1698 | ret = nilfs_bmap_prepare_alloc_ptr(btree, nreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1699 | if (ret < 0) |
| 1700 | goto err_out_dreq; |
| 1701 | |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 1702 | ret = nilfs_btree_get_new_block(btree, nreq->bpr_ptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1703 | if (ret < 0) |
| 1704 | goto err_out_nreq; |
| 1705 | |
| 1706 | *bhp = bh; |
| 1707 | stats->bs_nblocks++; |
| 1708 | } |
| 1709 | |
| 1710 | /* success */ |
| 1711 | return 0; |
| 1712 | |
| 1713 | /* error */ |
| 1714 | err_out_nreq: |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1715 | nilfs_bmap_abort_alloc_ptr(btree, nreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1716 | err_out_dreq: |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1717 | nilfs_bmap_abort_alloc_ptr(btree, dreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1718 | stats->bs_nblocks = 0; |
| 1719 | return ret; |
| 1720 | |
| 1721 | } |
| 1722 | |
| 1723 | static void |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1724 | nilfs_btree_commit_convert_and_insert(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1725 | __u64 key, __u64 ptr, |
| 1726 | const __u64 *keys, const __u64 *ptrs, |
Ryusuke Konishi | 3033342 | 2009-05-24 00:09:44 +0900 | [diff] [blame] | 1727 | int n, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1728 | union nilfs_bmap_ptr_req *dreq, |
| 1729 | union nilfs_bmap_ptr_req *nreq, |
| 1730 | struct buffer_head *bh) |
| 1731 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1732 | struct nilfs_btree_node *node; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1733 | struct inode *dat; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1734 | __u64 tmpptr; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1735 | int ncblk; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1736 | |
| 1737 | /* free resources */ |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1738 | if (btree->b_ops->bop_clear != NULL) |
| 1739 | btree->b_ops->bop_clear(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1740 | |
| 1741 | /* ptr must be a pointer to a buffer head. */ |
| 1742 | set_buffer_nilfs_volatile((struct buffer_head *)((unsigned long)ptr)); |
| 1743 | |
| 1744 | /* convert and insert */ |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1745 | dat = NILFS_BMAP_USE_VBN(btree) ? nilfs_bmap_get_dat(btree) : NULL; |
Ryusuke Konishi | 957ed60 | 2015-02-27 15:51:56 -0800 | [diff] [blame] | 1746 | __nilfs_btree_init(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1747 | if (nreq != NULL) { |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1748 | nilfs_bmap_commit_alloc_ptr(btree, dreq, dat); |
| 1749 | nilfs_bmap_commit_alloc_ptr(btree, nreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1750 | |
| 1751 | /* create child node at level 1 */ |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1752 | node = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1753 | ncblk = nilfs_btree_nchildren_per_block(btree); |
| 1754 | nilfs_btree_node_init(node, 0, 1, n, ncblk, keys, ptrs); |
| 1755 | nilfs_btree_node_insert(node, n, key, dreq->bpr_ptr, ncblk); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1756 | if (!buffer_dirty(bh)) |
Ryusuke Konishi | 5fc7b14 | 2011-05-05 12:56:51 +0900 | [diff] [blame] | 1757 | mark_buffer_dirty(bh); |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1758 | if (!nilfs_bmap_dirty(btree)) |
| 1759 | nilfs_bmap_set_dirty(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1760 | |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 1761 | brelse(bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1762 | |
| 1763 | /* create root node at level 2 */ |
| 1764 | node = nilfs_btree_get_root(btree); |
| 1765 | tmpptr = nreq->bpr_ptr; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1766 | nilfs_btree_node_init(node, NILFS_BTREE_NODE_ROOT, 2, 1, |
| 1767 | NILFS_BTREE_ROOT_NCHILDREN_MAX, |
| 1768 | &keys[0], &tmpptr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1769 | } else { |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1770 | nilfs_bmap_commit_alloc_ptr(btree, dreq, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1771 | |
| 1772 | /* create root node at level 1 */ |
| 1773 | node = nilfs_btree_get_root(btree); |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1774 | nilfs_btree_node_init(node, NILFS_BTREE_NODE_ROOT, 1, n, |
| 1775 | NILFS_BTREE_ROOT_NCHILDREN_MAX, |
| 1776 | keys, ptrs); |
| 1777 | nilfs_btree_node_insert(node, n, key, dreq->bpr_ptr, |
| 1778 | NILFS_BTREE_ROOT_NCHILDREN_MAX); |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1779 | if (!nilfs_bmap_dirty(btree)) |
| 1780 | nilfs_bmap_set_dirty(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1781 | } |
| 1782 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1783 | if (NILFS_BMAP_USE_VBN(btree)) |
Ryusuke Konishi | dc935be | 2010-07-10 22:21:54 +0900 | [diff] [blame] | 1784 | nilfs_bmap_set_target_v(btree, key, dreq->bpr_ptr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1785 | } |
| 1786 | |
| 1787 | /** |
| 1788 | * nilfs_btree_convert_and_insert - |
| 1789 | * @bmap: |
| 1790 | * @key: |
| 1791 | * @ptr: |
| 1792 | * @keys: |
| 1793 | * @ptrs: |
| 1794 | * @n: |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1795 | */ |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1796 | int nilfs_btree_convert_and_insert(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1797 | __u64 key, __u64 ptr, |
Ryusuke Konishi | 3033342 | 2009-05-24 00:09:44 +0900 | [diff] [blame] | 1798 | const __u64 *keys, const __u64 *ptrs, int n) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1799 | { |
| 1800 | struct buffer_head *bh; |
| 1801 | union nilfs_bmap_ptr_req dreq, nreq, *di, *ni; |
| 1802 | struct nilfs_bmap_stats stats; |
| 1803 | int ret; |
| 1804 | |
| 1805 | if (n + 1 <= NILFS_BTREE_ROOT_NCHILDREN_MAX) { |
| 1806 | di = &dreq; |
| 1807 | ni = NULL; |
| 1808 | } else if ((n + 1) <= NILFS_BTREE_NODE_NCHILDREN_MAX( |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1809 | 1 << btree->b_inode->i_blkbits)) { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1810 | di = &dreq; |
| 1811 | ni = &nreq; |
| 1812 | } else { |
| 1813 | di = NULL; |
| 1814 | ni = NULL; |
| 1815 | BUG(); |
| 1816 | } |
| 1817 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1818 | ret = nilfs_btree_prepare_convert_and_insert(btree, key, di, ni, &bh, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1819 | &stats); |
| 1820 | if (ret < 0) |
| 1821 | return ret; |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1822 | nilfs_btree_commit_convert_and_insert(btree, key, ptr, keys, ptrs, n, |
Ryusuke Konishi | 3033342 | 2009-05-24 00:09:44 +0900 | [diff] [blame] | 1823 | di, ni, bh); |
Ryusuke Konishi | be66737 | 2011-03-05 00:19:32 +0900 | [diff] [blame] | 1824 | nilfs_inode_add_blocks(btree->b_inode, stats.bs_nblocks); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1825 | return 0; |
| 1826 | } |
| 1827 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1828 | static int nilfs_btree_propagate_p(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1829 | struct nilfs_btree_path *path, |
| 1830 | int level, |
| 1831 | struct buffer_head *bh) |
| 1832 | { |
| 1833 | while ((++level < nilfs_btree_height(btree) - 1) && |
| 1834 | !buffer_dirty(path[level].bp_bh)) |
Ryusuke Konishi | 5fc7b14 | 2011-05-05 12:56:51 +0900 | [diff] [blame] | 1835 | mark_buffer_dirty(path[level].bp_bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1836 | |
| 1837 | return 0; |
| 1838 | } |
| 1839 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1840 | static int nilfs_btree_prepare_update_v(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1841 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1842 | int level, struct inode *dat) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1843 | { |
| 1844 | struct nilfs_btree_node *parent; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1845 | int ncmax, ret; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1846 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1847 | parent = nilfs_btree_get_node(btree, path, level + 1, &ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1848 | path[level].bp_oldreq.bpr_ptr = |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1849 | nilfs_btree_node_get_ptr(parent, path[level + 1].bp_index, |
| 1850 | ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1851 | 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] | 1852 | ret = nilfs_dat_prepare_update(dat, &path[level].bp_oldreq.bpr_req, |
| 1853 | &path[level].bp_newreq.bpr_req); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1854 | if (ret < 0) |
| 1855 | return ret; |
| 1856 | |
| 1857 | if (buffer_nilfs_node(path[level].bp_bh)) { |
| 1858 | path[level].bp_ctxt.oldkey = path[level].bp_oldreq.bpr_ptr; |
| 1859 | path[level].bp_ctxt.newkey = path[level].bp_newreq.bpr_ptr; |
| 1860 | path[level].bp_ctxt.bh = path[level].bp_bh; |
| 1861 | ret = nilfs_btnode_prepare_change_key( |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1862 | &NILFS_BMAP_I(btree)->i_btnode_cache, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1863 | &path[level].bp_ctxt); |
| 1864 | if (ret < 0) { |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1865 | nilfs_dat_abort_update(dat, |
| 1866 | &path[level].bp_oldreq.bpr_req, |
| 1867 | &path[level].bp_newreq.bpr_req); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1868 | return ret; |
| 1869 | } |
| 1870 | } |
| 1871 | |
| 1872 | return 0; |
| 1873 | } |
| 1874 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1875 | static void nilfs_btree_commit_update_v(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1876 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1877 | int level, struct inode *dat) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1878 | { |
| 1879 | struct nilfs_btree_node *parent; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1880 | int ncmax; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1881 | |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1882 | nilfs_dat_commit_update(dat, &path[level].bp_oldreq.bpr_req, |
| 1883 | &path[level].bp_newreq.bpr_req, |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1884 | btree->b_ptr_type == NILFS_BMAP_PTR_VS); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1885 | |
| 1886 | if (buffer_nilfs_node(path[level].bp_bh)) { |
| 1887 | nilfs_btnode_commit_change_key( |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1888 | &NILFS_BMAP_I(btree)->i_btnode_cache, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1889 | &path[level].bp_ctxt); |
| 1890 | path[level].bp_bh = path[level].bp_ctxt.bh; |
| 1891 | } |
| 1892 | set_buffer_nilfs_volatile(path[level].bp_bh); |
| 1893 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1894 | parent = nilfs_btree_get_node(btree, path, level + 1, &ncmax); |
| 1895 | nilfs_btree_node_set_ptr(parent, path[level + 1].bp_index, |
| 1896 | path[level].bp_newreq.bpr_ptr, ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1897 | } |
| 1898 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1899 | static void nilfs_btree_abort_update_v(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1900 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1901 | int level, struct inode *dat) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1902 | { |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1903 | nilfs_dat_abort_update(dat, &path[level].bp_oldreq.bpr_req, |
| 1904 | &path[level].bp_newreq.bpr_req); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1905 | if (buffer_nilfs_node(path[level].bp_bh)) |
| 1906 | nilfs_btnode_abort_change_key( |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1907 | &NILFS_BMAP_I(btree)->i_btnode_cache, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1908 | &path[level].bp_ctxt); |
| 1909 | } |
| 1910 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1911 | static int nilfs_btree_prepare_propagate_v(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1912 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1913 | int minlevel, int *maxlevelp, |
| 1914 | struct inode *dat) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1915 | { |
| 1916 | int level, ret; |
| 1917 | |
| 1918 | level = minlevel; |
| 1919 | if (!buffer_nilfs_volatile(path[level].bp_bh)) { |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1920 | ret = nilfs_btree_prepare_update_v(btree, path, level, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1921 | if (ret < 0) |
| 1922 | return ret; |
| 1923 | } |
| 1924 | while ((++level < nilfs_btree_height(btree) - 1) && |
| 1925 | !buffer_dirty(path[level].bp_bh)) { |
| 1926 | |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 1927 | WARN_ON(buffer_nilfs_volatile(path[level].bp_bh)); |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1928 | ret = nilfs_btree_prepare_update_v(btree, path, level, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1929 | if (ret < 0) |
| 1930 | goto out; |
| 1931 | } |
| 1932 | |
| 1933 | /* success */ |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1934 | *maxlevelp = level - 1; |
| 1935 | return 0; |
| 1936 | |
| 1937 | /* error */ |
| 1938 | out: |
| 1939 | while (--level > minlevel) |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1940 | nilfs_btree_abort_update_v(btree, path, level, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1941 | if (!buffer_nilfs_volatile(path[level].bp_bh)) |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1942 | nilfs_btree_abort_update_v(btree, path, level, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1943 | return ret; |
| 1944 | } |
| 1945 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1946 | static void nilfs_btree_commit_propagate_v(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1947 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1948 | int minlevel, int maxlevel, |
| 1949 | struct buffer_head *bh, |
| 1950 | struct inode *dat) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1951 | { |
| 1952 | int level; |
| 1953 | |
| 1954 | if (!buffer_nilfs_volatile(path[minlevel].bp_bh)) |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1955 | nilfs_btree_commit_update_v(btree, path, minlevel, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1956 | |
| 1957 | for (level = minlevel + 1; level <= maxlevel; level++) |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1958 | nilfs_btree_commit_update_v(btree, path, level, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1959 | } |
| 1960 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1961 | static int nilfs_btree_propagate_v(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1962 | struct nilfs_btree_path *path, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1963 | int level, struct buffer_head *bh) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1964 | { |
Li Hong | 308f441 | 2010-04-02 18:40:39 +0800 | [diff] [blame] | 1965 | int maxlevel = 0, ret; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1966 | struct nilfs_btree_node *parent; |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1967 | struct inode *dat = nilfs_bmap_get_dat(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1968 | __u64 ptr; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1969 | int ncmax; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1970 | |
| 1971 | get_bh(bh); |
| 1972 | path[level].bp_bh = bh; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1973 | ret = nilfs_btree_prepare_propagate_v(btree, path, level, &maxlevel, |
| 1974 | dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1975 | if (ret < 0) |
| 1976 | goto out; |
| 1977 | |
| 1978 | if (buffer_nilfs_volatile(path[level].bp_bh)) { |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 1979 | parent = nilfs_btree_get_node(btree, path, level + 1, &ncmax); |
| 1980 | ptr = nilfs_btree_node_get_ptr(parent, |
| 1981 | path[level + 1].bp_index, |
| 1982 | ncmax); |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1983 | ret = nilfs_dat_mark_dirty(dat, ptr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1984 | if (ret < 0) |
| 1985 | goto out; |
| 1986 | } |
| 1987 | |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 1988 | nilfs_btree_commit_propagate_v(btree, path, level, maxlevel, bh, dat); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1989 | |
| 1990 | out: |
| 1991 | brelse(path[level].bp_bh); |
| 1992 | path[level].bp_bh = NULL; |
| 1993 | return ret; |
| 1994 | } |
| 1995 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 1996 | static int nilfs_btree_propagate(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1997 | struct buffer_head *bh) |
| 1998 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 1999 | struct nilfs_btree_path *path; |
| 2000 | struct nilfs_btree_node *node; |
| 2001 | __u64 key; |
| 2002 | int level, ret; |
| 2003 | |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 2004 | WARN_ON(!buffer_dirty(bh)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2005 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2006 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2007 | if (path == NULL) |
| 2008 | return -ENOMEM; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2009 | |
| 2010 | if (buffer_nilfs_node(bh)) { |
| 2011 | node = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2012 | key = nilfs_btree_node_get_key(node, 0); |
| 2013 | level = nilfs_btree_node_get_level(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2014 | } else { |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2015 | key = nilfs_bmap_data_get_key(btree, bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2016 | level = NILFS_BTREE_LEVEL_DATA; |
| 2017 | } |
| 2018 | |
Ryusuke Konishi | 03bdb5a | 2010-07-18 10:42:26 +0900 | [diff] [blame] | 2019 | ret = nilfs_btree_do_lookup(btree, path, key, NULL, level + 1, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2020 | if (ret < 0) { |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 2021 | if (unlikely(ret == -ENOENT)) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2022 | printk(KERN_CRIT "%s: key = %llu, level == %d\n", |
| 2023 | __func__, (unsigned long long)key, level); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2024 | goto out; |
| 2025 | } |
| 2026 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2027 | ret = NILFS_BMAP_USE_VBN(btree) ? |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 2028 | nilfs_btree_propagate_v(btree, path, level, bh) : |
| 2029 | nilfs_btree_propagate_p(btree, path, level, bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2030 | |
| 2031 | out: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2032 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2033 | |
| 2034 | return ret; |
| 2035 | } |
| 2036 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2037 | static int nilfs_btree_propagate_gc(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2038 | struct buffer_head *bh) |
| 2039 | { |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2040 | 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] | 2041 | } |
| 2042 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2043 | static void nilfs_btree_add_dirty_buffer(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2044 | struct list_head *lists, |
| 2045 | struct buffer_head *bh) |
| 2046 | { |
| 2047 | struct list_head *head; |
| 2048 | struct buffer_head *cbh; |
| 2049 | struct nilfs_btree_node *node, *cnode; |
| 2050 | __u64 key, ckey; |
| 2051 | int level; |
| 2052 | |
| 2053 | get_bh(bh); |
| 2054 | node = (struct nilfs_btree_node *)bh->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2055 | key = nilfs_btree_node_get_key(node, 0); |
| 2056 | level = nilfs_btree_node_get_level(node); |
Ryusuke Konishi | cfa913a | 2010-07-07 17:19:54 +0900 | [diff] [blame] | 2057 | if (level < NILFS_BTREE_LEVEL_NODE_MIN || |
| 2058 | level >= NILFS_BTREE_LEVEL_MAX) { |
| 2059 | dump_stack(); |
| 2060 | printk(KERN_WARNING |
| 2061 | "%s: invalid btree level: %d (key=%llu, ino=%lu, " |
| 2062 | "blocknr=%llu)\n", |
| 2063 | __func__, level, (unsigned long long)key, |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2064 | NILFS_BMAP_I(btree)->vfs_inode.i_ino, |
Ryusuke Konishi | cfa913a | 2010-07-07 17:19:54 +0900 | [diff] [blame] | 2065 | (unsigned long long)bh->b_blocknr); |
| 2066 | return; |
| 2067 | } |
| 2068 | |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2069 | list_for_each(head, &lists[level]) { |
| 2070 | cbh = list_entry(head, struct buffer_head, b_assoc_buffers); |
| 2071 | cnode = (struct nilfs_btree_node *)cbh->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2072 | ckey = nilfs_btree_node_get_key(cnode, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2073 | if (key < ckey) |
| 2074 | break; |
| 2075 | } |
| 2076 | list_add_tail(&bh->b_assoc_buffers, head); |
| 2077 | } |
| 2078 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2079 | static void nilfs_btree_lookup_dirty_buffers(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2080 | struct list_head *listp) |
| 2081 | { |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2082 | struct address_space *btcache = &NILFS_BMAP_I(btree)->i_btnode_cache; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2083 | struct list_head lists[NILFS_BTREE_LEVEL_MAX]; |
| 2084 | struct pagevec pvec; |
| 2085 | struct buffer_head *bh, *head; |
| 2086 | pgoff_t index = 0; |
| 2087 | int level, i; |
| 2088 | |
| 2089 | for (level = NILFS_BTREE_LEVEL_NODE_MIN; |
| 2090 | level < NILFS_BTREE_LEVEL_MAX; |
| 2091 | level++) |
| 2092 | INIT_LIST_HEAD(&lists[level]); |
| 2093 | |
| 2094 | pagevec_init(&pvec, 0); |
| 2095 | |
| 2096 | while (pagevec_lookup_tag(&pvec, btcache, &index, PAGECACHE_TAG_DIRTY, |
| 2097 | PAGEVEC_SIZE)) { |
| 2098 | for (i = 0; i < pagevec_count(&pvec); i++) { |
| 2099 | bh = head = page_buffers(pvec.pages[i]); |
| 2100 | do { |
| 2101 | if (buffer_dirty(bh)) |
| 2102 | nilfs_btree_add_dirty_buffer(btree, |
| 2103 | lists, bh); |
| 2104 | } while ((bh = bh->b_this_page) != head); |
| 2105 | } |
| 2106 | pagevec_release(&pvec); |
| 2107 | cond_resched(); |
| 2108 | } |
| 2109 | |
| 2110 | for (level = NILFS_BTREE_LEVEL_NODE_MIN; |
| 2111 | level < NILFS_BTREE_LEVEL_MAX; |
| 2112 | level++) |
Ryusuke Konishi | 0935db7 | 2009-11-29 02:39:11 +0900 | [diff] [blame] | 2113 | list_splice_tail(&lists[level], listp); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2114 | } |
| 2115 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2116 | static int nilfs_btree_assign_p(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2117 | struct nilfs_btree_path *path, |
| 2118 | int level, |
| 2119 | struct buffer_head **bh, |
| 2120 | sector_t blocknr, |
| 2121 | union nilfs_binfo *binfo) |
| 2122 | { |
| 2123 | struct nilfs_btree_node *parent; |
| 2124 | __u64 key; |
| 2125 | __u64 ptr; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 2126 | int ncmax, ret; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2127 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 2128 | parent = nilfs_btree_get_node(btree, path, level + 1, &ncmax); |
| 2129 | ptr = nilfs_btree_node_get_ptr(parent, path[level + 1].bp_index, |
| 2130 | ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2131 | if (buffer_nilfs_node(*bh)) { |
| 2132 | path[level].bp_ctxt.oldkey = ptr; |
| 2133 | path[level].bp_ctxt.newkey = blocknr; |
| 2134 | path[level].bp_ctxt.bh = *bh; |
| 2135 | ret = nilfs_btnode_prepare_change_key( |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2136 | &NILFS_BMAP_I(btree)->i_btnode_cache, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2137 | &path[level].bp_ctxt); |
| 2138 | if (ret < 0) |
| 2139 | return ret; |
| 2140 | nilfs_btnode_commit_change_key( |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2141 | &NILFS_BMAP_I(btree)->i_btnode_cache, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2142 | &path[level].bp_ctxt); |
| 2143 | *bh = path[level].bp_ctxt.bh; |
| 2144 | } |
| 2145 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 2146 | nilfs_btree_node_set_ptr(parent, path[level + 1].bp_index, blocknr, |
| 2147 | ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2148 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2149 | key = nilfs_btree_node_get_key(parent, path[level + 1].bp_index); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2150 | /* on-disk format */ |
Ryusuke Konishi | 25b8d7d | 2010-07-10 16:50:41 +0900 | [diff] [blame] | 2151 | binfo->bi_dat.bi_blkoff = cpu_to_le64(key); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2152 | binfo->bi_dat.bi_level = level; |
| 2153 | |
| 2154 | return 0; |
| 2155 | } |
| 2156 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2157 | static int nilfs_btree_assign_v(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2158 | struct nilfs_btree_path *path, |
| 2159 | int level, |
| 2160 | struct buffer_head **bh, |
| 2161 | sector_t blocknr, |
| 2162 | union nilfs_binfo *binfo) |
| 2163 | { |
| 2164 | struct nilfs_btree_node *parent; |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2165 | struct inode *dat = nilfs_bmap_get_dat(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2166 | __u64 key; |
| 2167 | __u64 ptr; |
| 2168 | union nilfs_bmap_ptr_req req; |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 2169 | int ncmax, ret; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2170 | |
Ryusuke Konishi | 9b7b265 | 2010-07-13 23:33:53 +0900 | [diff] [blame] | 2171 | parent = nilfs_btree_get_node(btree, path, level + 1, &ncmax); |
| 2172 | ptr = nilfs_btree_node_get_ptr(parent, path[level + 1].bp_index, |
| 2173 | ncmax); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2174 | req.bpr_ptr = ptr; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 2175 | ret = nilfs_dat_prepare_start(dat, &req.bpr_req); |
| 2176 | if (ret < 0) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2177 | return ret; |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 2178 | nilfs_dat_commit_start(dat, &req.bpr_req, blocknr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2179 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2180 | key = nilfs_btree_node_get_key(parent, path[level + 1].bp_index); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2181 | /* on-disk format */ |
Ryusuke Konishi | 25b8d7d | 2010-07-10 16:50:41 +0900 | [diff] [blame] | 2182 | binfo->bi_v.bi_vblocknr = cpu_to_le64(ptr); |
| 2183 | binfo->bi_v.bi_blkoff = cpu_to_le64(key); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2184 | |
| 2185 | return 0; |
| 2186 | } |
| 2187 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2188 | static int nilfs_btree_assign(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2189 | struct buffer_head **bh, |
| 2190 | sector_t blocknr, |
| 2191 | union nilfs_binfo *binfo) |
| 2192 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2193 | struct nilfs_btree_path *path; |
| 2194 | struct nilfs_btree_node *node; |
| 2195 | __u64 key; |
| 2196 | int level, ret; |
| 2197 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2198 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2199 | if (path == NULL) |
| 2200 | return -ENOMEM; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2201 | |
| 2202 | if (buffer_nilfs_node(*bh)) { |
| 2203 | node = (struct nilfs_btree_node *)(*bh)->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2204 | key = nilfs_btree_node_get_key(node, 0); |
| 2205 | level = nilfs_btree_node_get_level(node); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2206 | } else { |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2207 | key = nilfs_bmap_data_get_key(btree, *bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2208 | level = NILFS_BTREE_LEVEL_DATA; |
| 2209 | } |
| 2210 | |
Ryusuke Konishi | 03bdb5a | 2010-07-18 10:42:26 +0900 | [diff] [blame] | 2211 | ret = nilfs_btree_do_lookup(btree, path, key, NULL, level + 1, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2212 | if (ret < 0) { |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 2213 | WARN_ON(ret == -ENOENT); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2214 | goto out; |
| 2215 | } |
| 2216 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2217 | ret = NILFS_BMAP_USE_VBN(btree) ? |
Ryusuke Konishi | 7cde31d | 2009-05-24 18:07:59 +0900 | [diff] [blame] | 2218 | nilfs_btree_assign_v(btree, path, level, bh, blocknr, binfo) : |
| 2219 | nilfs_btree_assign_p(btree, path, level, bh, blocknr, binfo); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2220 | |
| 2221 | out: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2222 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2223 | |
| 2224 | return ret; |
| 2225 | } |
| 2226 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2227 | static int nilfs_btree_assign_gc(struct nilfs_bmap *btree, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2228 | struct buffer_head **bh, |
| 2229 | sector_t blocknr, |
| 2230 | union nilfs_binfo *binfo) |
| 2231 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2232 | struct nilfs_btree_node *node; |
| 2233 | __u64 key; |
| 2234 | int ret; |
| 2235 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2236 | ret = nilfs_dat_move(nilfs_bmap_get_dat(btree), (*bh)->b_blocknr, |
Ryusuke Konishi | 2e0c2c7 | 2009-08-15 15:34:33 +0900 | [diff] [blame] | 2237 | blocknr); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2238 | if (ret < 0) |
| 2239 | return ret; |
| 2240 | |
| 2241 | if (buffer_nilfs_node(*bh)) { |
| 2242 | node = (struct nilfs_btree_node *)(*bh)->b_data; |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2243 | key = nilfs_btree_node_get_key(node, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2244 | } else |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2245 | key = nilfs_bmap_data_get_key(btree, *bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2246 | |
| 2247 | /* on-disk format */ |
| 2248 | binfo->bi_v.bi_vblocknr = cpu_to_le64((*bh)->b_blocknr); |
Ryusuke Konishi | 25b8d7d | 2010-07-10 16:50:41 +0900 | [diff] [blame] | 2249 | binfo->bi_v.bi_blkoff = cpu_to_le64(key); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2250 | |
| 2251 | return 0; |
| 2252 | } |
| 2253 | |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2254 | 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] | 2255 | { |
| 2256 | struct buffer_head *bh; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2257 | struct nilfs_btree_path *path; |
| 2258 | __u64 ptr; |
| 2259 | int ret; |
| 2260 | |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2261 | path = nilfs_btree_alloc_path(); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2262 | if (path == NULL) |
| 2263 | return -ENOMEM; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2264 | |
Ryusuke Konishi | 03bdb5a | 2010-07-18 10:42:26 +0900 | [diff] [blame] | 2265 | ret = nilfs_btree_do_lookup(btree, path, key, &ptr, level + 1, 0); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2266 | if (ret < 0) { |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 2267 | WARN_ON(ret == -ENOENT); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2268 | goto out; |
| 2269 | } |
Ryusuke Konishi | f198dbb | 2009-05-22 01:07:13 +0900 | [diff] [blame] | 2270 | ret = nilfs_btree_get_block(btree, ptr, &bh); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2271 | if (ret < 0) { |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 2272 | WARN_ON(ret == -ENOENT); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2273 | goto out; |
| 2274 | } |
| 2275 | |
| 2276 | if (!buffer_dirty(bh)) |
Ryusuke Konishi | 5fc7b14 | 2011-05-05 12:56:51 +0900 | [diff] [blame] | 2277 | mark_buffer_dirty(bh); |
Ryusuke Konishi | 087d01b | 2009-05-22 00:33:13 +0900 | [diff] [blame] | 2278 | brelse(bh); |
Ryusuke Konishi | e7c274f | 2010-07-10 19:09:49 +0900 | [diff] [blame] | 2279 | if (!nilfs_bmap_dirty(btree)) |
| 2280 | nilfs_bmap_set_dirty(btree); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2281 | |
| 2282 | out: |
Ryusuke Konishi | 6d28f7e | 2009-08-15 01:14:10 +0900 | [diff] [blame] | 2283 | nilfs_btree_free_path(path); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2284 | return ret; |
| 2285 | } |
| 2286 | |
| 2287 | static const struct nilfs_bmap_operations nilfs_btree_ops = { |
| 2288 | .bop_lookup = nilfs_btree_lookup, |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 2289 | .bop_lookup_contig = nilfs_btree_lookup_contig, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2290 | .bop_insert = nilfs_btree_insert, |
| 2291 | .bop_delete = nilfs_btree_delete, |
| 2292 | .bop_clear = NULL, |
| 2293 | |
| 2294 | .bop_propagate = nilfs_btree_propagate, |
| 2295 | |
| 2296 | .bop_lookup_dirty_buffers = nilfs_btree_lookup_dirty_buffers, |
| 2297 | |
| 2298 | .bop_assign = nilfs_btree_assign, |
| 2299 | .bop_mark = nilfs_btree_mark, |
| 2300 | |
| 2301 | .bop_last_key = nilfs_btree_last_key, |
| 2302 | .bop_check_insert = NULL, |
| 2303 | .bop_check_delete = nilfs_btree_check_delete, |
| 2304 | .bop_gather_data = nilfs_btree_gather_data, |
| 2305 | }; |
| 2306 | |
| 2307 | static const struct nilfs_bmap_operations nilfs_btree_ops_gc = { |
| 2308 | .bop_lookup = NULL, |
Ryusuke Konishi | c3a7abf | 2009-05-25 02:47:14 +0900 | [diff] [blame] | 2309 | .bop_lookup_contig = NULL, |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2310 | .bop_insert = NULL, |
| 2311 | .bop_delete = NULL, |
| 2312 | .bop_clear = NULL, |
| 2313 | |
| 2314 | .bop_propagate = nilfs_btree_propagate_gc, |
| 2315 | |
| 2316 | .bop_lookup_dirty_buffers = nilfs_btree_lookup_dirty_buffers, |
| 2317 | |
| 2318 | .bop_assign = nilfs_btree_assign_gc, |
| 2319 | .bop_mark = NULL, |
| 2320 | |
| 2321 | .bop_last_key = NULL, |
| 2322 | .bop_check_insert = NULL, |
| 2323 | .bop_check_delete = NULL, |
| 2324 | .bop_gather_data = NULL, |
| 2325 | }; |
| 2326 | |
Ryusuke Konishi | 957ed60 | 2015-02-27 15:51:56 -0800 | [diff] [blame] | 2327 | static void __nilfs_btree_init(struct nilfs_bmap *bmap) |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2328 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2329 | bmap->b_ops = &nilfs_btree_ops; |
Ryusuke Konishi | 5ad2686e9 | 2010-07-13 23:33:54 +0900 | [diff] [blame] | 2330 | bmap->b_nchildren_per_block = |
| 2331 | NILFS_BTREE_NODE_NCHILDREN_MAX(nilfs_btree_node_size(bmap)); |
Ryusuke Konishi | 957ed60 | 2015-02-27 15:51:56 -0800 | [diff] [blame] | 2332 | } |
| 2333 | |
| 2334 | int nilfs_btree_init(struct nilfs_bmap *bmap) |
| 2335 | { |
| 2336 | int ret = 0; |
| 2337 | |
| 2338 | __nilfs_btree_init(bmap); |
| 2339 | |
| 2340 | if (nilfs_btree_root_broken(nilfs_btree_get_root(bmap), |
| 2341 | bmap->b_inode->i_ino)) |
| 2342 | ret = -EIO; |
| 2343 | return ret; |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2344 | } |
| 2345 | |
| 2346 | void nilfs_btree_init_gc(struct nilfs_bmap *bmap) |
| 2347 | { |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2348 | bmap->b_ops = &nilfs_btree_ops_gc; |
Ryusuke Konishi | 5ad2686e9 | 2010-07-13 23:33:54 +0900 | [diff] [blame] | 2349 | bmap->b_nchildren_per_block = |
| 2350 | NILFS_BTREE_NODE_NCHILDREN_MAX(nilfs_btree_node_size(bmap)); |
Koji Sato | 17c76b0 | 2009-04-06 19:01:24 -0700 | [diff] [blame] | 2351 | } |