Chris Mason | 6cbd557 | 2007-06-12 09:07:21 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007 Oracle. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public |
| 6 | * License v2 as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public |
| 14 | * License along with this program; if not, write to the |
| 15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 16 | * Boston, MA 021110-1307, USA. |
| 17 | */ |
| 18 | |
Chris Mason | a6b6e75 | 2007-10-15 16:22:39 -0400 | [diff] [blame] | 19 | #include <linux/sched.h> |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 20 | #include "ctree.h" |
| 21 | #include "disk-io.h" |
Chris Mason | 7f5c151 | 2007-03-23 15:56:19 -0400 | [diff] [blame] | 22 | #include "transaction.h" |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 23 | #include "print-tree.h" |
Chris Mason | 9a8dd15 | 2007-02-23 08:38:36 -0500 | [diff] [blame] | 24 | |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 25 | static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root |
| 26 | *root, struct btrfs_path *path, int level); |
| 27 | static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 28 | *root, struct btrfs_key *ins_key, |
Chris Mason | cc0c553 | 2007-10-25 15:42:57 -0400 | [diff] [blame] | 29 | struct btrfs_path *path, int data_size, int extend); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 30 | static int push_node_left(struct btrfs_trans_handle *trans, |
| 31 | struct btrfs_root *root, struct extent_buffer *dst, |
| 32 | struct extent_buffer *src); |
| 33 | static int balance_node_right(struct btrfs_trans_handle *trans, |
| 34 | struct btrfs_root *root, |
| 35 | struct extent_buffer *dst_buf, |
| 36 | struct extent_buffer *src_buf); |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 37 | static int del_ptr(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
| 38 | struct btrfs_path *path, int level, int slot); |
Chris Mason | d97e63b | 2007-02-20 16:40:44 -0500 | [diff] [blame] | 39 | |
Chris Mason | df24a2b | 2007-04-04 09:36:31 -0400 | [diff] [blame] | 40 | inline void btrfs_init_path(struct btrfs_path *p) |
| 41 | { |
| 42 | memset(p, 0, sizeof(*p)); |
| 43 | } |
| 44 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 45 | struct btrfs_path *btrfs_alloc_path(void) |
| 46 | { |
Chris Mason | df24a2b | 2007-04-04 09:36:31 -0400 | [diff] [blame] | 47 | struct btrfs_path *path; |
| 48 | path = kmem_cache_alloc(btrfs_path_cachep, GFP_NOFS); |
Chris Mason | 2cc58cf | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 49 | if (path) { |
Chris Mason | df24a2b | 2007-04-04 09:36:31 -0400 | [diff] [blame] | 50 | btrfs_init_path(path); |
Chris Mason | 2cc58cf | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 51 | path->reada = 1; |
| 52 | } |
Chris Mason | df24a2b | 2007-04-04 09:36:31 -0400 | [diff] [blame] | 53 | return path; |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 54 | } |
| 55 | |
| 56 | void btrfs_free_path(struct btrfs_path *p) |
| 57 | { |
Chris Mason | df24a2b | 2007-04-04 09:36:31 -0400 | [diff] [blame] | 58 | btrfs_release_path(NULL, p); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 59 | kmem_cache_free(btrfs_path_cachep, p); |
| 60 | } |
| 61 | |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 62 | void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p) |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 63 | { |
| 64 | int i; |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 65 | for (i = 0; i < BTRFS_MAX_LEVEL; i++) { |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 66 | if (!p->nodes[i]) |
| 67 | break; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 68 | free_extent_buffer(p->nodes[i]); |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 69 | } |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 70 | memset(p, 0, sizeof(*p)); |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 71 | } |
| 72 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 73 | static int __btrfs_cow_block(struct btrfs_trans_handle *trans, |
| 74 | struct btrfs_root *root, |
| 75 | struct extent_buffer *buf, |
| 76 | struct extent_buffer *parent, int parent_slot, |
| 77 | struct extent_buffer **cow_ret, |
| 78 | u64 search_start, u64 empty_size) |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 79 | { |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 80 | u64 root_gen; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 81 | struct extent_buffer *cow; |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 82 | u32 nritems; |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 83 | int ret = 0; |
| 84 | int different_trans = 0; |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 85 | int level; |
| 86 | struct btrfs_key first_key; |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 87 | |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 88 | if (root->ref_cows) { |
| 89 | root_gen = trans->transid; |
| 90 | } else { |
| 91 | root_gen = 0; |
| 92 | } |
| 93 | |
| 94 | WARN_ON(root->ref_cows && trans->transid != |
| 95 | root->fs_info->running_transaction->transid); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 96 | WARN_ON(root->ref_cows && trans->transid != root->last_trans); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 97 | |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 98 | level = btrfs_header_level(buf); |
| 99 | nritems = btrfs_header_nritems(buf); |
| 100 | if (nritems) { |
| 101 | if (level == 0) |
| 102 | btrfs_item_key_to_cpu(buf, &first_key, 0); |
| 103 | else |
| 104 | btrfs_node_key_to_cpu(buf, &first_key, 0); |
| 105 | } else { |
| 106 | first_key.objectid = 0; |
| 107 | } |
| 108 | cow = __btrfs_alloc_free_block(trans, root, buf->len, |
| 109 | root->root_key.objectid, |
| 110 | root_gen, first_key.objectid, level, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 111 | search_start, empty_size); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 112 | if (IS_ERR(cow)) |
| 113 | return PTR_ERR(cow); |
| 114 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 115 | copy_extent_buffer(cow, buf, 0, 0, cow->len); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 116 | btrfs_set_header_bytenr(cow, cow->start); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 117 | btrfs_set_header_generation(cow, trans->transid); |
| 118 | btrfs_set_header_owner(cow, root->root_key.objectid); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 119 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 120 | WARN_ON(btrfs_header_generation(buf) > trans->transid); |
| 121 | if (btrfs_header_generation(buf) != trans->transid) { |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 122 | different_trans = 1; |
| 123 | ret = btrfs_inc_ref(trans, root, buf); |
| 124 | if (ret) |
| 125 | return ret; |
| 126 | } else { |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 127 | clean_tree_block(trans, root, buf); |
| 128 | } |
| 129 | |
| 130 | if (buf == root->node) { |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 131 | root_gen = btrfs_header_generation(buf); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 132 | root->node = cow; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 133 | extent_buffer_get(cow); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 134 | if (buf != root->commit_root) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 135 | btrfs_free_extent(trans, root, buf->start, |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 136 | buf->len, root->root_key.objectid, |
| 137 | root_gen, 0, 0, 1); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 138 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 139 | free_extent_buffer(buf); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 140 | } else { |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 141 | root_gen = btrfs_header_generation(parent); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 142 | btrfs_set_node_blockptr(parent, parent_slot, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 143 | cow->start); |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 144 | WARN_ON(trans->transid == 0); |
| 145 | btrfs_set_node_ptr_generation(parent, parent_slot, |
| 146 | trans->transid); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 147 | btrfs_mark_buffer_dirty(parent); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 148 | WARN_ON(btrfs_header_generation(parent) != trans->transid); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 149 | btrfs_free_extent(trans, root, buf->start, buf->len, |
| 150 | btrfs_header_owner(parent), root_gen, |
| 151 | 0, 0, 1); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 152 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 153 | free_extent_buffer(buf); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 154 | btrfs_mark_buffer_dirty(cow); |
| 155 | *cow_ret = cow; |
| 156 | return 0; |
| 157 | } |
| 158 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 159 | int btrfs_cow_block(struct btrfs_trans_handle *trans, |
| 160 | struct btrfs_root *root, struct extent_buffer *buf, |
| 161 | struct extent_buffer *parent, int parent_slot, |
| 162 | struct extent_buffer **cow_ret) |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 163 | { |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 164 | u64 search_start; |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 165 | int ret; |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 166 | if (trans->transaction != root->fs_info->running_transaction) { |
| 167 | printk(KERN_CRIT "trans %Lu running %Lu\n", trans->transid, |
| 168 | root->fs_info->running_transaction->transid); |
| 169 | WARN_ON(1); |
| 170 | } |
| 171 | if (trans->transid != root->fs_info->generation) { |
| 172 | printk(KERN_CRIT "trans %Lu running %Lu\n", trans->transid, |
| 173 | root->fs_info->generation); |
| 174 | WARN_ON(1); |
| 175 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 176 | if (btrfs_header_generation(buf) == trans->transid) { |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 177 | *cow_ret = buf; |
| 178 | return 0; |
| 179 | } |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 180 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 181 | search_start = buf->start & ~((u64)BTRFS_BLOCK_GROUP_SIZE - 1); |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 182 | ret = __btrfs_cow_block(trans, root, buf, parent, |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 183 | parent_slot, cow_ret, search_start, 0); |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 184 | return ret; |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 185 | } |
| 186 | |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame] | 187 | static int close_blocks(u64 blocknr, u64 other, u32 blocksize) |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 188 | { |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame] | 189 | if (blocknr < other && other - (blocknr + blocksize) < 32768) |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 190 | return 1; |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame] | 191 | if (blocknr > other && blocknr - (other + blocksize) < 32768) |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 192 | return 1; |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 193 | return 0; |
| 194 | } |
| 195 | |
Chris Mason | 081e957 | 2007-11-06 10:26:24 -0500 | [diff] [blame] | 196 | /* |
| 197 | * compare two keys in a memcmp fashion |
| 198 | */ |
| 199 | static int comp_keys(struct btrfs_disk_key *disk, struct btrfs_key *k2) |
| 200 | { |
| 201 | struct btrfs_key k1; |
| 202 | |
| 203 | btrfs_disk_key_to_cpu(&k1, disk); |
| 204 | |
| 205 | if (k1.objectid > k2->objectid) |
| 206 | return 1; |
| 207 | if (k1.objectid < k2->objectid) |
| 208 | return -1; |
| 209 | if (k1.type > k2->type) |
| 210 | return 1; |
| 211 | if (k1.type < k2->type) |
| 212 | return -1; |
| 213 | if (k1.offset > k2->offset) |
| 214 | return 1; |
| 215 | if (k1.offset < k2->offset) |
| 216 | return -1; |
| 217 | return 0; |
| 218 | } |
| 219 | |
| 220 | |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 221 | int btrfs_realloc_node(struct btrfs_trans_handle *trans, |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 222 | struct btrfs_root *root, struct extent_buffer *parent, |
Chris Mason | a6b6e75 | 2007-10-15 16:22:39 -0400 | [diff] [blame] | 223 | int start_slot, int cache_only, u64 *last_ret, |
| 224 | struct btrfs_key *progress) |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 225 | { |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame] | 226 | struct extent_buffer *cur; |
| 227 | struct extent_buffer *tmp; |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 228 | u64 blocknr; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 229 | u64 search_start = *last_ret; |
| 230 | u64 last_block = 0; |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 231 | u64 other; |
| 232 | u32 parent_nritems; |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 233 | int end_slot; |
| 234 | int i; |
| 235 | int err = 0; |
Chris Mason | f2183bd | 2007-08-10 14:42:37 -0400 | [diff] [blame] | 236 | int parent_level; |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame] | 237 | int uptodate; |
| 238 | u32 blocksize; |
Chris Mason | 081e957 | 2007-11-06 10:26:24 -0500 | [diff] [blame] | 239 | int progress_passed = 0; |
| 240 | struct btrfs_disk_key disk_key; |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 241 | |
Chris Mason | 5708b95 | 2007-10-25 15:43:18 -0400 | [diff] [blame] | 242 | parent_level = btrfs_header_level(parent); |
| 243 | if (cache_only && parent_level != 1) |
| 244 | return 0; |
| 245 | |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 246 | if (trans->transaction != root->fs_info->running_transaction) { |
| 247 | printk(KERN_CRIT "trans %Lu running %Lu\n", trans->transid, |
| 248 | root->fs_info->running_transaction->transid); |
| 249 | WARN_ON(1); |
| 250 | } |
| 251 | if (trans->transid != root->fs_info->generation) { |
| 252 | printk(KERN_CRIT "trans %Lu running %Lu\n", trans->transid, |
| 253 | root->fs_info->generation); |
| 254 | WARN_ON(1); |
| 255 | } |
Chris Mason | 86479a0 | 2007-09-10 19:58:16 -0400 | [diff] [blame] | 256 | |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame] | 257 | parent_nritems = btrfs_header_nritems(parent); |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame] | 258 | blocksize = btrfs_level_size(root, parent_level - 1); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 259 | end_slot = parent_nritems; |
| 260 | |
| 261 | if (parent_nritems == 1) |
| 262 | return 0; |
| 263 | |
| 264 | for (i = start_slot; i < end_slot; i++) { |
| 265 | int close = 1; |
Chris Mason | a6b6e75 | 2007-10-15 16:22:39 -0400 | [diff] [blame] | 266 | |
Chris Mason | 5708b95 | 2007-10-25 15:43:18 -0400 | [diff] [blame] | 267 | if (!parent->map_token) { |
| 268 | map_extent_buffer(parent, |
| 269 | btrfs_node_key_ptr_offset(i), |
| 270 | sizeof(struct btrfs_key_ptr), |
| 271 | &parent->map_token, &parent->kaddr, |
| 272 | &parent->map_start, &parent->map_len, |
| 273 | KM_USER1); |
| 274 | } |
Chris Mason | 081e957 | 2007-11-06 10:26:24 -0500 | [diff] [blame] | 275 | btrfs_node_key(parent, &disk_key, i); |
| 276 | if (!progress_passed && comp_keys(&disk_key, progress) < 0) |
| 277 | continue; |
| 278 | |
| 279 | progress_passed = 1; |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame] | 280 | blocknr = btrfs_node_blockptr(parent, i); |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 281 | if (last_block == 0) |
| 282 | last_block = blocknr; |
Chris Mason | 5708b95 | 2007-10-25 15:43:18 -0400 | [diff] [blame] | 283 | |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 284 | if (i > 0) { |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame] | 285 | other = btrfs_node_blockptr(parent, i - 1); |
| 286 | close = close_blocks(blocknr, other, blocksize); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 287 | } |
Chris Mason | 5708b95 | 2007-10-25 15:43:18 -0400 | [diff] [blame] | 288 | if (close && i < end_slot - 2) { |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame] | 289 | other = btrfs_node_blockptr(parent, i + 1); |
| 290 | close = close_blocks(blocknr, other, blocksize); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 291 | } |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 292 | if (close) { |
| 293 | last_block = blocknr; |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 294 | continue; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 295 | } |
Chris Mason | 5708b95 | 2007-10-25 15:43:18 -0400 | [diff] [blame] | 296 | if (parent->map_token) { |
| 297 | unmap_extent_buffer(parent, parent->map_token, |
| 298 | KM_USER1); |
| 299 | parent->map_token = NULL; |
| 300 | } |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 301 | |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame] | 302 | cur = btrfs_find_tree_block(root, blocknr, blocksize); |
| 303 | if (cur) |
| 304 | uptodate = btrfs_buffer_uptodate(cur); |
| 305 | else |
| 306 | uptodate = 0; |
Chris Mason | 5708b95 | 2007-10-25 15:43:18 -0400 | [diff] [blame] | 307 | if (!cur || !uptodate) { |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 308 | if (cache_only) { |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame] | 309 | free_extent_buffer(cur); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 310 | continue; |
| 311 | } |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame] | 312 | if (!cur) { |
| 313 | cur = read_tree_block(root, blocknr, |
| 314 | blocksize); |
| 315 | } else if (!uptodate) { |
| 316 | btrfs_read_buffer(cur); |
Chris Mason | f2183bd | 2007-08-10 14:42:37 -0400 | [diff] [blame] | 317 | } |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 318 | } |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 319 | if (search_start == 0) |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame] | 320 | search_start = last_block; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 321 | |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame] | 322 | err = __btrfs_cow_block(trans, root, cur, parent, i, |
| 323 | &tmp, search_start, |
| 324 | min(16 * blocksize, |
| 325 | (end_slot - i) * blocksize)); |
Yan | 252c38f | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 326 | if (err) { |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame] | 327 | free_extent_buffer(cur); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 328 | break; |
Yan | 252c38f | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 329 | } |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame] | 330 | search_start = tmp->start; |
Chris Mason | 5708b95 | 2007-10-25 15:43:18 -0400 | [diff] [blame] | 331 | last_block = tmp->start; |
Chris Mason | f2183bd | 2007-08-10 14:42:37 -0400 | [diff] [blame] | 332 | *last_ret = search_start; |
| 333 | if (parent_level == 1) |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame] | 334 | btrfs_clear_buffer_defrag(tmp); |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame] | 335 | free_extent_buffer(tmp); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 336 | } |
Chris Mason | 5708b95 | 2007-10-25 15:43:18 -0400 | [diff] [blame] | 337 | if (parent->map_token) { |
| 338 | unmap_extent_buffer(parent, parent->map_token, |
| 339 | KM_USER1); |
| 340 | parent->map_token = NULL; |
| 341 | } |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 342 | return err; |
| 343 | } |
| 344 | |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 345 | /* |
| 346 | * The leaf data grows from end-to-front in the node. |
| 347 | * this returns the address of the start of the last item, |
| 348 | * which is the stop of the leaf data stack |
| 349 | */ |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 350 | static inline unsigned int leaf_data_end(struct btrfs_root *root, |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 351 | struct extent_buffer *leaf) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 352 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 353 | u32 nr = btrfs_header_nritems(leaf); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 354 | if (nr == 0) |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 355 | return BTRFS_LEAF_DATA_SIZE(root); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 356 | return btrfs_item_offset_nr(leaf, nr - 1); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 357 | } |
| 358 | |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 359 | static int check_node(struct btrfs_root *root, struct btrfs_path *path, |
| 360 | int level) |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 361 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 362 | struct extent_buffer *parent = NULL; |
| 363 | struct extent_buffer *node = path->nodes[level]; |
| 364 | struct btrfs_disk_key parent_key; |
| 365 | struct btrfs_disk_key node_key; |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 366 | int parent_slot; |
Chris Mason | 8d7be55 | 2007-05-10 11:24:42 -0400 | [diff] [blame] | 367 | int slot; |
| 368 | struct btrfs_key cpukey; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 369 | u32 nritems = btrfs_header_nritems(node); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 370 | |
| 371 | if (path->nodes[level + 1]) |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 372 | parent = path->nodes[level + 1]; |
Aneesh | a1f3963 | 2007-07-11 10:03:27 -0400 | [diff] [blame] | 373 | |
Chris Mason | 8d7be55 | 2007-05-10 11:24:42 -0400 | [diff] [blame] | 374 | slot = path->slots[level]; |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 375 | BUG_ON(nritems == 0); |
| 376 | if (parent) { |
Aneesh | a1f3963 | 2007-07-11 10:03:27 -0400 | [diff] [blame] | 377 | parent_slot = path->slots[level + 1]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 378 | btrfs_node_key(parent, &parent_key, parent_slot); |
| 379 | btrfs_node_key(node, &node_key, 0); |
| 380 | BUG_ON(memcmp(&parent_key, &node_key, |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 381 | sizeof(struct btrfs_disk_key))); |
Chris Mason | 1d4f8a0 | 2007-03-13 09:28:32 -0400 | [diff] [blame] | 382 | BUG_ON(btrfs_node_blockptr(parent, parent_slot) != |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 383 | btrfs_header_bytenr(node)); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 384 | } |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 385 | BUG_ON(nritems > BTRFS_NODEPTRS_PER_BLOCK(root)); |
Chris Mason | 8d7be55 | 2007-05-10 11:24:42 -0400 | [diff] [blame] | 386 | if (slot != 0) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 387 | btrfs_node_key_to_cpu(node, &cpukey, slot - 1); |
| 388 | btrfs_node_key(node, &node_key, slot); |
| 389 | BUG_ON(comp_keys(&node_key, &cpukey) <= 0); |
Chris Mason | 8d7be55 | 2007-05-10 11:24:42 -0400 | [diff] [blame] | 390 | } |
| 391 | if (slot < nritems - 1) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 392 | btrfs_node_key_to_cpu(node, &cpukey, slot + 1); |
| 393 | btrfs_node_key(node, &node_key, slot); |
| 394 | BUG_ON(comp_keys(&node_key, &cpukey) >= 0); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 395 | } |
| 396 | return 0; |
| 397 | } |
| 398 | |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 399 | static int check_leaf(struct btrfs_root *root, struct btrfs_path *path, |
| 400 | int level) |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 401 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 402 | struct extent_buffer *leaf = path->nodes[level]; |
| 403 | struct extent_buffer *parent = NULL; |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 404 | int parent_slot; |
Chris Mason | 8d7be55 | 2007-05-10 11:24:42 -0400 | [diff] [blame] | 405 | struct btrfs_key cpukey; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 406 | struct btrfs_disk_key parent_key; |
| 407 | struct btrfs_disk_key leaf_key; |
| 408 | int slot = path->slots[0]; |
Chris Mason | 8d7be55 | 2007-05-10 11:24:42 -0400 | [diff] [blame] | 409 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 410 | u32 nritems = btrfs_header_nritems(leaf); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 411 | |
| 412 | if (path->nodes[level + 1]) |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 413 | parent = path->nodes[level + 1]; |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 414 | |
| 415 | if (nritems == 0) |
| 416 | return 0; |
| 417 | |
| 418 | if (parent) { |
Aneesh | a1f3963 | 2007-07-11 10:03:27 -0400 | [diff] [blame] | 419 | parent_slot = path->slots[level + 1]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 420 | btrfs_node_key(parent, &parent_key, parent_slot); |
| 421 | btrfs_item_key(leaf, &leaf_key, 0); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 422 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 423 | BUG_ON(memcmp(&parent_key, &leaf_key, |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 424 | sizeof(struct btrfs_disk_key))); |
Chris Mason | 1d4f8a0 | 2007-03-13 09:28:32 -0400 | [diff] [blame] | 425 | BUG_ON(btrfs_node_blockptr(parent, parent_slot) != |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 426 | btrfs_header_bytenr(leaf)); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 427 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 428 | #if 0 |
| 429 | for (i = 0; nritems > 1 && i < nritems - 2; i++) { |
| 430 | btrfs_item_key_to_cpu(leaf, &cpukey, i + 1); |
| 431 | btrfs_item_key(leaf, &leaf_key, i); |
| 432 | if (comp_keys(&leaf_key, &cpukey) >= 0) { |
| 433 | btrfs_print_leaf(root, leaf); |
| 434 | printk("slot %d offset bad key\n", i); |
| 435 | BUG_ON(1); |
| 436 | } |
| 437 | if (btrfs_item_offset_nr(leaf, i) != |
| 438 | btrfs_item_end_nr(leaf, i + 1)) { |
| 439 | btrfs_print_leaf(root, leaf); |
| 440 | printk("slot %d offset bad\n", i); |
| 441 | BUG_ON(1); |
| 442 | } |
| 443 | if (i == 0) { |
| 444 | if (btrfs_item_offset_nr(leaf, i) + |
| 445 | btrfs_item_size_nr(leaf, i) != |
| 446 | BTRFS_LEAF_DATA_SIZE(root)) { |
| 447 | btrfs_print_leaf(root, leaf); |
| 448 | printk("slot %d first offset bad\n", i); |
| 449 | BUG_ON(1); |
| 450 | } |
| 451 | } |
| 452 | } |
| 453 | if (nritems > 0) { |
| 454 | if (btrfs_item_size_nr(leaf, nritems - 1) > 4096) { |
| 455 | btrfs_print_leaf(root, leaf); |
| 456 | printk("slot %d bad size \n", nritems - 1); |
| 457 | BUG_ON(1); |
| 458 | } |
| 459 | } |
| 460 | #endif |
| 461 | if (slot != 0 && slot < nritems - 1) { |
| 462 | btrfs_item_key(leaf, &leaf_key, slot); |
| 463 | btrfs_item_key_to_cpu(leaf, &cpukey, slot - 1); |
| 464 | if (comp_keys(&leaf_key, &cpukey) <= 0) { |
| 465 | btrfs_print_leaf(root, leaf); |
| 466 | printk("slot %d offset bad key\n", slot); |
| 467 | BUG_ON(1); |
| 468 | } |
| 469 | if (btrfs_item_offset_nr(leaf, slot - 1) != |
| 470 | btrfs_item_end_nr(leaf, slot)) { |
| 471 | btrfs_print_leaf(root, leaf); |
| 472 | printk("slot %d offset bad\n", slot); |
| 473 | BUG_ON(1); |
| 474 | } |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 475 | } |
Chris Mason | 8d7be55 | 2007-05-10 11:24:42 -0400 | [diff] [blame] | 476 | if (slot < nritems - 1) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 477 | btrfs_item_key(leaf, &leaf_key, slot); |
| 478 | btrfs_item_key_to_cpu(leaf, &cpukey, slot + 1); |
| 479 | BUG_ON(comp_keys(&leaf_key, &cpukey) >= 0); |
| 480 | if (btrfs_item_offset_nr(leaf, slot) != |
| 481 | btrfs_item_end_nr(leaf, slot + 1)) { |
| 482 | btrfs_print_leaf(root, leaf); |
| 483 | printk("slot %d offset bad\n", slot); |
| 484 | BUG_ON(1); |
| 485 | } |
Chris Mason | 8d7be55 | 2007-05-10 11:24:42 -0400 | [diff] [blame] | 486 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 487 | BUG_ON(btrfs_item_offset_nr(leaf, 0) + |
| 488 | btrfs_item_size_nr(leaf, 0) != BTRFS_LEAF_DATA_SIZE(root)); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 489 | return 0; |
| 490 | } |
| 491 | |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 492 | static int check_block(struct btrfs_root *root, struct btrfs_path *path, |
| 493 | int level) |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 494 | { |
Chris Mason | 810191f | 2007-10-15 16:18:55 -0400 | [diff] [blame] | 495 | return 0; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 496 | #if 0 |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 497 | struct extent_buffer *buf = path->nodes[level]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 498 | |
Chris Mason | 479965d | 2007-10-15 16:14:27 -0400 | [diff] [blame] | 499 | if (memcmp_extent_buffer(buf, root->fs_info->fsid, |
| 500 | (unsigned long)btrfs_header_fsid(buf), |
| 501 | BTRFS_FSID_SIZE)) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 502 | printk("warning bad block %Lu\n", buf->start); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 503 | return 1; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 504 | } |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 505 | #endif |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 506 | if (level == 0) |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 507 | return check_leaf(root, path, level); |
| 508 | return check_node(root, path, level); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 509 | } |
| 510 | |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 511 | /* |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 512 | * search for key in the extent_buffer. The items start at offset p, |
| 513 | * and they are item_size apart. There are 'max' items in p. |
| 514 | * |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 515 | * the slot in the array is returned via slot, and it points to |
| 516 | * the place where you would insert key if it is not found in |
| 517 | * the array. |
| 518 | * |
| 519 | * slot may point to max if the key is bigger than all of the keys |
| 520 | */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 521 | static int generic_bin_search(struct extent_buffer *eb, unsigned long p, |
| 522 | int item_size, struct btrfs_key *key, |
| 523 | int max, int *slot) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 524 | { |
| 525 | int low = 0; |
| 526 | int high = max; |
| 527 | int mid; |
| 528 | int ret; |
Chris Mason | 479965d | 2007-10-15 16:14:27 -0400 | [diff] [blame] | 529 | struct btrfs_disk_key *tmp = NULL; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 530 | struct btrfs_disk_key unaligned; |
| 531 | unsigned long offset; |
| 532 | char *map_token = NULL; |
| 533 | char *kaddr = NULL; |
| 534 | unsigned long map_start = 0; |
| 535 | unsigned long map_len = 0; |
Chris Mason | 479965d | 2007-10-15 16:14:27 -0400 | [diff] [blame] | 536 | int err; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 537 | |
| 538 | while(low < high) { |
| 539 | mid = (low + high) / 2; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 540 | offset = p + mid * item_size; |
| 541 | |
| 542 | if (!map_token || offset < map_start || |
| 543 | (offset + sizeof(struct btrfs_disk_key)) > |
| 544 | map_start + map_len) { |
Chris Mason | 479965d | 2007-10-15 16:14:27 -0400 | [diff] [blame] | 545 | if (map_token) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 546 | unmap_extent_buffer(eb, map_token, KM_USER0); |
Chris Mason | 479965d | 2007-10-15 16:14:27 -0400 | [diff] [blame] | 547 | map_token = NULL; |
| 548 | } |
| 549 | err = map_extent_buffer(eb, offset, |
| 550 | sizeof(struct btrfs_disk_key), |
| 551 | &map_token, &kaddr, |
| 552 | &map_start, &map_len, KM_USER0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 553 | |
Chris Mason | 479965d | 2007-10-15 16:14:27 -0400 | [diff] [blame] | 554 | if (!err) { |
| 555 | tmp = (struct btrfs_disk_key *)(kaddr + offset - |
| 556 | map_start); |
| 557 | } else { |
| 558 | read_extent_buffer(eb, &unaligned, |
| 559 | offset, sizeof(unaligned)); |
| 560 | tmp = &unaligned; |
| 561 | } |
| 562 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 563 | } else { |
| 564 | tmp = (struct btrfs_disk_key *)(kaddr + offset - |
| 565 | map_start); |
| 566 | } |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 567 | ret = comp_keys(tmp, key); |
| 568 | |
| 569 | if (ret < 0) |
| 570 | low = mid + 1; |
| 571 | else if (ret > 0) |
| 572 | high = mid; |
| 573 | else { |
| 574 | *slot = mid; |
Chris Mason | 479965d | 2007-10-15 16:14:27 -0400 | [diff] [blame] | 575 | if (map_token) |
| 576 | unmap_extent_buffer(eb, map_token, KM_USER0); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 577 | return 0; |
| 578 | } |
| 579 | } |
| 580 | *slot = low; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 581 | if (map_token) |
| 582 | unmap_extent_buffer(eb, map_token, KM_USER0); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 583 | return 1; |
| 584 | } |
| 585 | |
Chris Mason | 97571fd | 2007-02-24 13:39:08 -0500 | [diff] [blame] | 586 | /* |
| 587 | * simple bin_search frontend that does the right thing for |
| 588 | * leaves vs nodes |
| 589 | */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 590 | static int bin_search(struct extent_buffer *eb, struct btrfs_key *key, |
| 591 | int level, int *slot) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 592 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 593 | if (level == 0) { |
| 594 | return generic_bin_search(eb, |
| 595 | offsetof(struct btrfs_leaf, items), |
Chris Mason | 0783fcf | 2007-03-12 20:12:07 -0400 | [diff] [blame] | 596 | sizeof(struct btrfs_item), |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 597 | key, btrfs_header_nritems(eb), |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 598 | slot); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 599 | } else { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 600 | return generic_bin_search(eb, |
| 601 | offsetof(struct btrfs_node, ptrs), |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 602 | sizeof(struct btrfs_key_ptr), |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 603 | key, btrfs_header_nritems(eb), |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 604 | slot); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 605 | } |
| 606 | return -1; |
| 607 | } |
| 608 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 609 | static struct extent_buffer *read_node_slot(struct btrfs_root *root, |
| 610 | struct extent_buffer *parent, int slot) |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 611 | { |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 612 | if (slot < 0) |
| 613 | return NULL; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 614 | if (slot >= btrfs_header_nritems(parent)) |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 615 | return NULL; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 616 | return read_tree_block(root, btrfs_node_blockptr(parent, slot), |
| 617 | btrfs_level_size(root, btrfs_header_level(parent) - 1)); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 618 | } |
| 619 | |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 620 | static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root |
| 621 | *root, struct btrfs_path *path, int level) |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 622 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 623 | struct extent_buffer *right = NULL; |
| 624 | struct extent_buffer *mid; |
| 625 | struct extent_buffer *left = NULL; |
| 626 | struct extent_buffer *parent = NULL; |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 627 | int ret = 0; |
| 628 | int wret; |
| 629 | int pslot; |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 630 | int orig_slot = path->slots[level]; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 631 | int err_on_enospc = 0; |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 632 | u64 orig_ptr; |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 633 | |
| 634 | if (level == 0) |
| 635 | return 0; |
| 636 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 637 | mid = path->nodes[level]; |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 638 | WARN_ON(btrfs_header_generation(mid) != trans->transid); |
| 639 | |
Chris Mason | 1d4f8a0 | 2007-03-13 09:28:32 -0400 | [diff] [blame] | 640 | orig_ptr = btrfs_node_blockptr(mid, orig_slot); |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 641 | |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 642 | if (level < BTRFS_MAX_LEVEL - 1) |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 643 | parent = path->nodes[level + 1]; |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 644 | pslot = path->slots[level + 1]; |
| 645 | |
Chris Mason | 4068947 | 2007-03-17 14:29:23 -0400 | [diff] [blame] | 646 | /* |
| 647 | * deal with the case where there is only one pointer in the root |
| 648 | * by promoting the node below to a root |
| 649 | */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 650 | if (!parent) { |
| 651 | struct extent_buffer *child; |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 652 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 653 | if (btrfs_header_nritems(mid) != 1) |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 654 | return 0; |
| 655 | |
| 656 | /* promote the child to a root */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 657 | child = read_node_slot(root, mid, 0); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 658 | BUG_ON(!child); |
| 659 | root->node = child; |
| 660 | path->nodes[level] = NULL; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 661 | clean_tree_block(trans, root, mid); |
| 662 | wait_on_tree_block_writeback(root, mid); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 663 | /* once for the path */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 664 | free_extent_buffer(mid); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 665 | ret = btrfs_free_extent(trans, root, mid->start, mid->len, |
| 666 | root->root_key.objectid, |
| 667 | btrfs_header_generation(mid), 0, 0, 1); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 668 | /* once for the root ptr */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 669 | free_extent_buffer(mid); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 670 | return ret; |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 671 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 672 | if (btrfs_header_nritems(mid) > |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 673 | BTRFS_NODEPTRS_PER_BLOCK(root) / 4) |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 674 | return 0; |
| 675 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 676 | if (btrfs_header_nritems(mid) < 2) |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 677 | err_on_enospc = 1; |
| 678 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 679 | left = read_node_slot(root, parent, pslot - 1); |
| 680 | if (left) { |
| 681 | wret = btrfs_cow_block(trans, root, left, |
| 682 | parent, pslot - 1, &left); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 683 | if (wret) { |
| 684 | ret = wret; |
| 685 | goto enospc; |
| 686 | } |
Chris Mason | 2cc58cf | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 687 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 688 | right = read_node_slot(root, parent, pslot + 1); |
| 689 | if (right) { |
| 690 | wret = btrfs_cow_block(trans, root, right, |
| 691 | parent, pslot + 1, &right); |
Chris Mason | 2cc58cf | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 692 | if (wret) { |
| 693 | ret = wret; |
| 694 | goto enospc; |
| 695 | } |
| 696 | } |
| 697 | |
| 698 | /* first, try to make some room in the middle buffer */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 699 | if (left) { |
| 700 | orig_slot += btrfs_header_nritems(left); |
| 701 | wret = push_node_left(trans, root, left, mid); |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 702 | if (wret < 0) |
| 703 | ret = wret; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 704 | if (btrfs_header_nritems(mid) < 2) |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 705 | err_on_enospc = 1; |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 706 | } |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 707 | |
| 708 | /* |
| 709 | * then try to empty the right most buffer into the middle |
| 710 | */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 711 | if (right) { |
| 712 | wret = push_node_left(trans, root, mid, right); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 713 | if (wret < 0 && wret != -ENOSPC) |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 714 | ret = wret; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 715 | if (btrfs_header_nritems(right) == 0) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 716 | u64 bytenr = right->start; |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 717 | u64 generation = btrfs_header_generation(parent); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 718 | u32 blocksize = right->len; |
| 719 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 720 | clean_tree_block(trans, root, right); |
| 721 | wait_on_tree_block_writeback(root, right); |
| 722 | free_extent_buffer(right); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 723 | right = NULL; |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 724 | wret = del_ptr(trans, root, path, level + 1, pslot + |
| 725 | 1); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 726 | if (wret) |
| 727 | ret = wret; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 728 | wret = btrfs_free_extent(trans, root, bytenr, |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 729 | blocksize, |
| 730 | btrfs_header_owner(parent), |
| 731 | generation, 0, 0, 1); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 732 | if (wret) |
| 733 | ret = wret; |
| 734 | } else { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 735 | struct btrfs_disk_key right_key; |
| 736 | btrfs_node_key(right, &right_key, 0); |
| 737 | btrfs_set_node_key(parent, &right_key, pslot + 1); |
| 738 | btrfs_mark_buffer_dirty(parent); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 739 | } |
| 740 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 741 | if (btrfs_header_nritems(mid) == 1) { |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 742 | /* |
| 743 | * we're not allowed to leave a node with one item in the |
| 744 | * tree during a delete. A deletion from lower in the tree |
| 745 | * could try to delete the only pointer in this node. |
| 746 | * So, pull some keys from the left. |
| 747 | * There has to be a left pointer at this point because |
| 748 | * otherwise we would have pulled some pointers from the |
| 749 | * right |
| 750 | */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 751 | BUG_ON(!left); |
| 752 | wret = balance_node_right(trans, root, mid, left); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 753 | if (wret < 0) { |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 754 | ret = wret; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 755 | goto enospc; |
| 756 | } |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 757 | BUG_ON(wret == 1); |
| 758 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 759 | if (btrfs_header_nritems(mid) == 0) { |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 760 | /* we've managed to empty the middle node, drop it */ |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 761 | u64 root_gen = btrfs_header_generation(parent); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 762 | u64 bytenr = mid->start; |
| 763 | u32 blocksize = mid->len; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 764 | clean_tree_block(trans, root, mid); |
| 765 | wait_on_tree_block_writeback(root, mid); |
| 766 | free_extent_buffer(mid); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 767 | mid = NULL; |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 768 | wret = del_ptr(trans, root, path, level + 1, pslot); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 769 | if (wret) |
| 770 | ret = wret; |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 771 | wret = btrfs_free_extent(trans, root, bytenr, blocksize, |
| 772 | btrfs_header_owner(parent), |
| 773 | root_gen, 0, 0, 1); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 774 | if (wret) |
| 775 | ret = wret; |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 776 | } else { |
| 777 | /* update the parent key to reflect our changes */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 778 | struct btrfs_disk_key mid_key; |
| 779 | btrfs_node_key(mid, &mid_key, 0); |
| 780 | btrfs_set_node_key(parent, &mid_key, pslot); |
| 781 | btrfs_mark_buffer_dirty(parent); |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 782 | } |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 783 | |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 784 | /* update the path */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 785 | if (left) { |
| 786 | if (btrfs_header_nritems(left) > orig_slot) { |
| 787 | extent_buffer_get(left); |
| 788 | path->nodes[level] = left; |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 789 | path->slots[level + 1] -= 1; |
| 790 | path->slots[level] = orig_slot; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 791 | if (mid) |
| 792 | free_extent_buffer(mid); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 793 | } else { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 794 | orig_slot -= btrfs_header_nritems(left); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 795 | path->slots[level] = orig_slot; |
| 796 | } |
| 797 | } |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 798 | /* double check we haven't messed things up */ |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 799 | check_block(root, path, level); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 800 | if (orig_ptr != |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 801 | btrfs_node_blockptr(path->nodes[level], path->slots[level])) |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 802 | BUG(); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 803 | enospc: |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 804 | if (right) |
| 805 | free_extent_buffer(right); |
| 806 | if (left) |
| 807 | free_extent_buffer(left); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 808 | return ret; |
| 809 | } |
| 810 | |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 811 | /* returns zero if the push worked, non-zero otherwise */ |
| 812 | static int push_nodes_for_insert(struct btrfs_trans_handle *trans, |
| 813 | struct btrfs_root *root, |
| 814 | struct btrfs_path *path, int level) |
| 815 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 816 | struct extent_buffer *right = NULL; |
| 817 | struct extent_buffer *mid; |
| 818 | struct extent_buffer *left = NULL; |
| 819 | struct extent_buffer *parent = NULL; |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 820 | int ret = 0; |
| 821 | int wret; |
| 822 | int pslot; |
| 823 | int orig_slot = path->slots[level]; |
| 824 | u64 orig_ptr; |
| 825 | |
| 826 | if (level == 0) |
| 827 | return 1; |
| 828 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 829 | mid = path->nodes[level]; |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 830 | WARN_ON(btrfs_header_generation(mid) != trans->transid); |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 831 | orig_ptr = btrfs_node_blockptr(mid, orig_slot); |
| 832 | |
| 833 | if (level < BTRFS_MAX_LEVEL - 1) |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 834 | parent = path->nodes[level + 1]; |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 835 | pslot = path->slots[level + 1]; |
| 836 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 837 | if (!parent) |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 838 | return 1; |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 839 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 840 | left = read_node_slot(root, parent, pslot - 1); |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 841 | |
| 842 | /* first, try to make some room in the middle buffer */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 843 | if (left) { |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 844 | u32 left_nr; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 845 | left_nr = btrfs_header_nritems(left); |
Chris Mason | 33ade1f | 2007-04-20 13:48:57 -0400 | [diff] [blame] | 846 | if (left_nr >= BTRFS_NODEPTRS_PER_BLOCK(root) - 1) { |
| 847 | wret = 1; |
| 848 | } else { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 849 | ret = btrfs_cow_block(trans, root, left, parent, |
| 850 | pslot - 1, &left); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 851 | if (ret) |
| 852 | wret = 1; |
| 853 | else { |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 854 | wret = push_node_left(trans, root, |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 855 | left, mid); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 856 | } |
Chris Mason | 33ade1f | 2007-04-20 13:48:57 -0400 | [diff] [blame] | 857 | } |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 858 | if (wret < 0) |
| 859 | ret = wret; |
| 860 | if (wret == 0) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 861 | struct btrfs_disk_key disk_key; |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 862 | orig_slot += left_nr; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 863 | btrfs_node_key(mid, &disk_key, 0); |
| 864 | btrfs_set_node_key(parent, &disk_key, pslot); |
| 865 | btrfs_mark_buffer_dirty(parent); |
| 866 | if (btrfs_header_nritems(left) > orig_slot) { |
| 867 | path->nodes[level] = left; |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 868 | path->slots[level + 1] -= 1; |
| 869 | path->slots[level] = orig_slot; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 870 | free_extent_buffer(mid); |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 871 | } else { |
| 872 | orig_slot -= |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 873 | btrfs_header_nritems(left); |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 874 | path->slots[level] = orig_slot; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 875 | free_extent_buffer(left); |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 876 | } |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 877 | return 0; |
| 878 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 879 | free_extent_buffer(left); |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 880 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 881 | right= read_node_slot(root, parent, pslot + 1); |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 882 | |
| 883 | /* |
| 884 | * then try to empty the right most buffer into the middle |
| 885 | */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 886 | if (right) { |
Chris Mason | 33ade1f | 2007-04-20 13:48:57 -0400 | [diff] [blame] | 887 | u32 right_nr; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 888 | right_nr = btrfs_header_nritems(right); |
Chris Mason | 33ade1f | 2007-04-20 13:48:57 -0400 | [diff] [blame] | 889 | if (right_nr >= BTRFS_NODEPTRS_PER_BLOCK(root) - 1) { |
| 890 | wret = 1; |
| 891 | } else { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 892 | ret = btrfs_cow_block(trans, root, right, |
| 893 | parent, pslot + 1, |
| 894 | &right); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 895 | if (ret) |
| 896 | wret = 1; |
| 897 | else { |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 898 | wret = balance_node_right(trans, root, |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 899 | right, mid); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 900 | } |
Chris Mason | 33ade1f | 2007-04-20 13:48:57 -0400 | [diff] [blame] | 901 | } |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 902 | if (wret < 0) |
| 903 | ret = wret; |
| 904 | if (wret == 0) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 905 | struct btrfs_disk_key disk_key; |
| 906 | |
| 907 | btrfs_node_key(right, &disk_key, 0); |
| 908 | btrfs_set_node_key(parent, &disk_key, pslot + 1); |
| 909 | btrfs_mark_buffer_dirty(parent); |
| 910 | |
| 911 | if (btrfs_header_nritems(mid) <= orig_slot) { |
| 912 | path->nodes[level] = right; |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 913 | path->slots[level + 1] += 1; |
| 914 | path->slots[level] = orig_slot - |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 915 | btrfs_header_nritems(mid); |
| 916 | free_extent_buffer(mid); |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 917 | } else { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 918 | free_extent_buffer(right); |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 919 | } |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 920 | return 0; |
| 921 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 922 | free_extent_buffer(right); |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 923 | } |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 924 | return 1; |
| 925 | } |
| 926 | |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 927 | /* |
Chris Mason | 3c69fae | 2007-08-07 15:52:22 -0400 | [diff] [blame] | 928 | * readahead one full node of leaves |
| 929 | */ |
| 930 | static void reada_for_search(struct btrfs_root *root, struct btrfs_path *path, |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 931 | int level, int slot) |
Chris Mason | 3c69fae | 2007-08-07 15:52:22 -0400 | [diff] [blame] | 932 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 933 | struct extent_buffer *node; |
Chris Mason | 3c69fae | 2007-08-07 15:52:22 -0400 | [diff] [blame] | 934 | u32 nritems; |
Chris Mason | 3c69fae | 2007-08-07 15:52:22 -0400 | [diff] [blame] | 935 | u64 search; |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame] | 936 | u64 lowest_read; |
| 937 | u64 highest_read; |
| 938 | u64 nread = 0; |
Chris Mason | 3c69fae | 2007-08-07 15:52:22 -0400 | [diff] [blame] | 939 | int direction = path->reada; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 940 | struct extent_buffer *eb; |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame] | 941 | u32 nr; |
| 942 | u32 blocksize; |
| 943 | u32 nscan = 0; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 944 | |
Chris Mason | a6b6e75 | 2007-10-15 16:22:39 -0400 | [diff] [blame] | 945 | if (level != 1) |
Chris Mason | 3c69fae | 2007-08-07 15:52:22 -0400 | [diff] [blame] | 946 | return; |
| 947 | |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 948 | if (!path->nodes[level]) |
| 949 | return; |
| 950 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 951 | node = path->nodes[level]; |
Chris Mason | 3c69fae | 2007-08-07 15:52:22 -0400 | [diff] [blame] | 952 | search = btrfs_node_blockptr(node, slot); |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame] | 953 | blocksize = btrfs_level_size(root, level - 1); |
| 954 | eb = btrfs_find_tree_block(root, search, blocksize); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 955 | if (eb) { |
| 956 | free_extent_buffer(eb); |
Chris Mason | 3c69fae | 2007-08-07 15:52:22 -0400 | [diff] [blame] | 957 | return; |
| 958 | } |
| 959 | |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame] | 960 | highest_read = search; |
| 961 | lowest_read = search; |
| 962 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 963 | nritems = btrfs_header_nritems(node); |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame] | 964 | nr = slot; |
Chris Mason | 3c69fae | 2007-08-07 15:52:22 -0400 | [diff] [blame] | 965 | while(1) { |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame] | 966 | if (direction < 0) { |
| 967 | if (nr == 0) |
| 968 | break; |
| 969 | nr--; |
| 970 | } else if (direction > 0) { |
| 971 | nr++; |
| 972 | if (nr >= nritems) |
| 973 | break; |
Chris Mason | 3c69fae | 2007-08-07 15:52:22 -0400 | [diff] [blame] | 974 | } |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame] | 975 | search = btrfs_node_blockptr(node, nr); |
| 976 | if ((search >= lowest_read && search <= highest_read) || |
| 977 | (search < lowest_read && lowest_read - search <= 32768) || |
| 978 | (search > highest_read && search - highest_read <= 32768)) { |
| 979 | readahead_tree_block(root, search, blocksize); |
| 980 | nread += blocksize; |
| 981 | } |
| 982 | nscan++; |
| 983 | if (path->reada < 2 && (nread > (256 * 1024) || nscan > 32)) |
| 984 | break; |
| 985 | if(nread > (1024 * 1024) || nscan > 128) |
| 986 | break; |
| 987 | |
| 988 | if (search < lowest_read) |
| 989 | lowest_read = search; |
| 990 | if (search > highest_read) |
| 991 | highest_read = search; |
Chris Mason | 3c69fae | 2007-08-07 15:52:22 -0400 | [diff] [blame] | 992 | } |
| 993 | } |
| 994 | /* |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 995 | * look for key in the tree. path is filled in with nodes along the way |
| 996 | * if key is found, we return zero and you can find the item in the leaf |
| 997 | * level of the path (level 0) |
| 998 | * |
| 999 | * If the key isn't found, the path points to the slot where it should |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1000 | * be inserted, and 1 is returned. If there are other errors during the |
| 1001 | * search a negative error number is returned. |
Chris Mason | 97571fd | 2007-02-24 13:39:08 -0500 | [diff] [blame] | 1002 | * |
| 1003 | * if ins_len > 0, nodes and leaves will be split as we walk down the |
| 1004 | * tree. if ins_len < 0, nodes will be merged as we walk down the tree (if |
| 1005 | * possible) |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1006 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 1007 | int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root |
| 1008 | *root, struct btrfs_key *key, struct btrfs_path *p, int |
| 1009 | ins_len, int cow) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1010 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1011 | struct extent_buffer *b; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1012 | u64 bytenr; |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1013 | u64 ptr_gen; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1014 | int slot; |
| 1015 | int ret; |
| 1016 | int level; |
Chris Mason | 3c69fae | 2007-08-07 15:52:22 -0400 | [diff] [blame] | 1017 | int should_reada = p->reada; |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 1018 | u8 lowest_level = 0; |
| 1019 | |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 1020 | lowest_level = p->lowest_level; |
| 1021 | WARN_ON(lowest_level && ins_len); |
Chris Mason | 22b0ebd | 2007-03-30 08:47:31 -0400 | [diff] [blame] | 1022 | WARN_ON(p->nodes[0] != NULL); |
| 1023 | WARN_ON(!mutex_is_locked(&root->fs_info->fs_mutex)); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 1024 | again: |
| 1025 | b = root->node; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1026 | extent_buffer_get(b); |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 1027 | while (b) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1028 | level = btrfs_header_level(b); |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 1029 | if (cow) { |
| 1030 | int wret; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 1031 | wret = btrfs_cow_block(trans, root, b, |
| 1032 | p->nodes[level + 1], |
| 1033 | p->slots[level + 1], |
Yan | 252c38f | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1034 | &b); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1035 | if (wret) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1036 | free_extent_buffer(b); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1037 | return wret; |
| 1038 | } |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 1039 | } |
| 1040 | BUG_ON(!cow && ins_len); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1041 | if (level != btrfs_header_level(b)) |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1042 | WARN_ON(1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1043 | level = btrfs_header_level(b); |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 1044 | p->nodes[level] = b; |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 1045 | ret = check_block(root, p, level); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1046 | if (ret) |
| 1047 | return -1; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1048 | ret = bin_search(b, key, level, &slot); |
| 1049 | if (level != 0) { |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1050 | if (ret && slot > 0) |
| 1051 | slot -= 1; |
| 1052 | p->slots[level] = slot; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1053 | if (ins_len > 0 && btrfs_header_nritems(b) >= |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1054 | BTRFS_NODEPTRS_PER_BLOCK(root) - 1) { |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 1055 | int sret = split_node(trans, root, p, level); |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 1056 | BUG_ON(sret > 0); |
| 1057 | if (sret) |
| 1058 | return sret; |
| 1059 | b = p->nodes[level]; |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 1060 | slot = p->slots[level]; |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 1061 | } else if (ins_len < 0) { |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 1062 | int sret = balance_level(trans, root, p, |
| 1063 | level); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 1064 | if (sret) |
| 1065 | return sret; |
| 1066 | b = p->nodes[level]; |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 1067 | if (!b) { |
| 1068 | btrfs_release_path(NULL, p); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 1069 | goto again; |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 1070 | } |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 1071 | slot = p->slots[level]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1072 | BUG_ON(btrfs_header_nritems(b) == 1); |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 1073 | } |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 1074 | /* this is only true while dropping a snapshot */ |
| 1075 | if (level == lowest_level) |
| 1076 | break; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1077 | bytenr = btrfs_node_blockptr(b, slot); |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1078 | ptr_gen = btrfs_node_ptr_generation(b, slot); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 1079 | if (should_reada) |
| 1080 | reada_for_search(root, p, level, slot); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1081 | b = read_tree_block(root, bytenr, |
| 1082 | btrfs_level_size(root, level - 1)); |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1083 | if (ptr_gen != btrfs_header_generation(b)) { |
| 1084 | printk("block %llu bad gen wanted %llu " |
| 1085 | "found %llu\n", |
| 1086 | (unsigned long long)b->start, |
| 1087 | (unsigned long long)ptr_gen, |
| 1088 | (unsigned long long)btrfs_header_generation(b)); |
| 1089 | } |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1090 | } else { |
| 1091 | p->slots[level] = slot; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1092 | if (ins_len > 0 && btrfs_leaf_free_space(root, b) < |
Chris Mason | 0783fcf | 2007-03-12 20:12:07 -0400 | [diff] [blame] | 1093 | sizeof(struct btrfs_item) + ins_len) { |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1094 | int sret = split_leaf(trans, root, key, |
Chris Mason | cc0c553 | 2007-10-25 15:42:57 -0400 | [diff] [blame] | 1095 | p, ins_len, ret == 0); |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 1096 | BUG_ON(sret > 0); |
| 1097 | if (sret) |
| 1098 | return sret; |
| 1099 | } |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1100 | return ret; |
| 1101 | } |
| 1102 | } |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1103 | return 1; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1104 | } |
| 1105 | |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1106 | /* |
| 1107 | * adjust the pointers going up the tree, starting at level |
| 1108 | * making sure the right key of each node is points to 'key'. |
| 1109 | * This is used after shifting pointers to the left, so it stops |
| 1110 | * fixing up pointers when a given leaf/node is not in slot 0 of the |
| 1111 | * higher levels |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1112 | * |
| 1113 | * If this fails to write a tree block, it returns -1, but continues |
| 1114 | * fixing up the blocks in ram so the tree is consistent. |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1115 | */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1116 | static int fixup_low_keys(struct btrfs_trans_handle *trans, |
| 1117 | struct btrfs_root *root, struct btrfs_path *path, |
| 1118 | struct btrfs_disk_key *key, int level) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1119 | { |
| 1120 | int i; |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1121 | int ret = 0; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1122 | struct extent_buffer *t; |
| 1123 | |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 1124 | for (i = level; i < BTRFS_MAX_LEVEL; i++) { |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1125 | int tslot = path->slots[i]; |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 1126 | if (!path->nodes[i]) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1127 | break; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1128 | t = path->nodes[i]; |
| 1129 | btrfs_set_node_key(t, key, tslot); |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 1130 | btrfs_mark_buffer_dirty(path->nodes[i]); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1131 | if (tslot != 0) |
| 1132 | break; |
| 1133 | } |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1134 | return ret; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1135 | } |
| 1136 | |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1137 | /* |
| 1138 | * try to push data from one node into the next node left in the |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 1139 | * tree. |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1140 | * |
| 1141 | * returns 0 if some ptrs were pushed left, < 0 if there was some horrible |
| 1142 | * error, and > 0 if there was no room in the left hand block. |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1143 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 1144 | static int push_node_left(struct btrfs_trans_handle *trans, struct btrfs_root |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1145 | *root, struct extent_buffer *dst, |
| 1146 | struct extent_buffer *src) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1147 | { |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1148 | int push_items = 0; |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 1149 | int src_nritems; |
| 1150 | int dst_nritems; |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1151 | int ret = 0; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1152 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1153 | src_nritems = btrfs_header_nritems(src); |
| 1154 | dst_nritems = btrfs_header_nritems(dst); |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 1155 | push_items = BTRFS_NODEPTRS_PER_BLOCK(root) - dst_nritems; |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1156 | WARN_ON(btrfs_header_generation(src) != trans->transid); |
| 1157 | WARN_ON(btrfs_header_generation(dst) != trans->transid); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1158 | |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 1159 | if (push_items <= 0) { |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1160 | return 1; |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 1161 | } |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1162 | |
| 1163 | if (src_nritems < push_items) |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 1164 | push_items = src_nritems; |
| 1165 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1166 | copy_extent_buffer(dst, src, |
| 1167 | btrfs_node_key_ptr_offset(dst_nritems), |
| 1168 | btrfs_node_key_ptr_offset(0), |
| 1169 | push_items * sizeof(struct btrfs_key_ptr)); |
| 1170 | |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 1171 | if (push_items < src_nritems) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1172 | memmove_extent_buffer(src, btrfs_node_key_ptr_offset(0), |
| 1173 | btrfs_node_key_ptr_offset(push_items), |
| 1174 | (src_nritems - push_items) * |
| 1175 | sizeof(struct btrfs_key_ptr)); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 1176 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1177 | btrfs_set_header_nritems(src, src_nritems - push_items); |
| 1178 | btrfs_set_header_nritems(dst, dst_nritems + push_items); |
| 1179 | btrfs_mark_buffer_dirty(src); |
| 1180 | btrfs_mark_buffer_dirty(dst); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 1181 | return ret; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1182 | } |
| 1183 | |
Chris Mason | 97571fd | 2007-02-24 13:39:08 -0500 | [diff] [blame] | 1184 | /* |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 1185 | * try to push data from one node into the next node right in the |
| 1186 | * tree. |
| 1187 | * |
| 1188 | * returns 0 if some ptrs were pushed, < 0 if there was some horrible |
| 1189 | * error, and > 0 if there was no room in the right hand block. |
| 1190 | * |
| 1191 | * this will only push up to 1/2 the contents of the left node over |
| 1192 | */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1193 | static int balance_node_right(struct btrfs_trans_handle *trans, |
| 1194 | struct btrfs_root *root, |
| 1195 | struct extent_buffer *dst, |
| 1196 | struct extent_buffer *src) |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 1197 | { |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 1198 | int push_items = 0; |
| 1199 | int max_push; |
| 1200 | int src_nritems; |
| 1201 | int dst_nritems; |
| 1202 | int ret = 0; |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 1203 | |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1204 | WARN_ON(btrfs_header_generation(src) != trans->transid); |
| 1205 | WARN_ON(btrfs_header_generation(dst) != trans->transid); |
| 1206 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1207 | src_nritems = btrfs_header_nritems(src); |
| 1208 | dst_nritems = btrfs_header_nritems(dst); |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 1209 | push_items = BTRFS_NODEPTRS_PER_BLOCK(root) - dst_nritems; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1210 | if (push_items <= 0) |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 1211 | return 1; |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 1212 | |
| 1213 | max_push = src_nritems / 2 + 1; |
| 1214 | /* don't try to empty the node */ |
Yan | 252c38f | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1215 | if (max_push >= src_nritems) |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 1216 | return 1; |
Yan | 252c38f | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1217 | |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 1218 | if (max_push < push_items) |
| 1219 | push_items = max_push; |
| 1220 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1221 | memmove_extent_buffer(dst, btrfs_node_key_ptr_offset(push_items), |
| 1222 | btrfs_node_key_ptr_offset(0), |
| 1223 | (dst_nritems) * |
| 1224 | sizeof(struct btrfs_key_ptr)); |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 1225 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1226 | copy_extent_buffer(dst, src, |
| 1227 | btrfs_node_key_ptr_offset(0), |
| 1228 | btrfs_node_key_ptr_offset(src_nritems - push_items), |
| 1229 | push_items * sizeof(struct btrfs_key_ptr)); |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 1230 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1231 | btrfs_set_header_nritems(src, src_nritems - push_items); |
| 1232 | btrfs_set_header_nritems(dst, dst_nritems + push_items); |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 1233 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1234 | btrfs_mark_buffer_dirty(src); |
| 1235 | btrfs_mark_buffer_dirty(dst); |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 1236 | return ret; |
| 1237 | } |
| 1238 | |
| 1239 | /* |
Chris Mason | 97571fd | 2007-02-24 13:39:08 -0500 | [diff] [blame] | 1240 | * helper function to insert a new root level in the tree. |
| 1241 | * A new node is allocated, and a single item is inserted to |
| 1242 | * point to the existing root |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1243 | * |
| 1244 | * returns zero on success or < 0 on failure. |
Chris Mason | 97571fd | 2007-02-24 13:39:08 -0500 | [diff] [blame] | 1245 | */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1246 | static int insert_new_root(struct btrfs_trans_handle *trans, |
| 1247 | struct btrfs_root *root, |
| 1248 | struct btrfs_path *path, int level) |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 1249 | { |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1250 | u64 root_gen; |
| 1251 | u64 lower_gen; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1252 | struct extent_buffer *lower; |
| 1253 | struct extent_buffer *c; |
| 1254 | struct btrfs_disk_key lower_key; |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 1255 | |
| 1256 | BUG_ON(path->nodes[level]); |
| 1257 | BUG_ON(path->nodes[level-1] != root->node); |
| 1258 | |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1259 | if (root->ref_cows) |
| 1260 | root_gen = trans->transid; |
| 1261 | else |
| 1262 | root_gen = 0; |
| 1263 | |
| 1264 | lower = path->nodes[level-1]; |
| 1265 | if (level == 1) |
| 1266 | btrfs_item_key(lower, &lower_key, 0); |
| 1267 | else |
| 1268 | btrfs_node_key(lower, &lower_key, 0); |
| 1269 | |
| 1270 | c = __btrfs_alloc_free_block(trans, root, root->nodesize, |
| 1271 | root->root_key.objectid, |
| 1272 | root_gen, lower_key.objectid, level, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1273 | root->node->start, 0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1274 | if (IS_ERR(c)) |
| 1275 | return PTR_ERR(c); |
| 1276 | memset_extent_buffer(c, 0, 0, root->nodesize); |
| 1277 | btrfs_set_header_nritems(c, 1); |
| 1278 | btrfs_set_header_level(c, level); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1279 | btrfs_set_header_bytenr(c, c->start); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1280 | btrfs_set_header_generation(c, trans->transid); |
| 1281 | btrfs_set_header_owner(c, root->root_key.objectid); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 1282 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1283 | write_extent_buffer(c, root->fs_info->fsid, |
| 1284 | (unsigned long)btrfs_header_fsid(c), |
| 1285 | BTRFS_FSID_SIZE); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1286 | btrfs_set_node_key(c, &lower_key, 0); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1287 | btrfs_set_node_blockptr(c, 0, lower->start); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1288 | lower_gen = btrfs_header_generation(lower); |
| 1289 | WARN_ON(lower_gen == 0); |
| 1290 | |
| 1291 | btrfs_set_node_ptr_generation(c, 0, lower_gen); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1292 | |
| 1293 | btrfs_mark_buffer_dirty(c); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 1294 | |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 1295 | /* the super has an extra ref to root->node */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1296 | free_extent_buffer(root->node); |
| 1297 | root->node = c; |
| 1298 | extent_buffer_get(c); |
| 1299 | path->nodes[level] = c; |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 1300 | path->slots[level] = 0; |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1301 | |
| 1302 | if (root->ref_cows && lower_gen != trans->transid) { |
| 1303 | struct btrfs_path *back_path = btrfs_alloc_path(); |
| 1304 | int ret; |
| 1305 | ret = btrfs_insert_extent_backref(trans, |
| 1306 | root->fs_info->extent_root, |
| 1307 | path, lower->start, |
| 1308 | root->root_key.objectid, |
| 1309 | trans->transid, 0, 0); |
| 1310 | BUG_ON(ret); |
| 1311 | btrfs_free_path(back_path); |
| 1312 | } |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 1313 | return 0; |
| 1314 | } |
| 1315 | |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1316 | /* |
| 1317 | * worker function to insert a single pointer in a node. |
| 1318 | * the node should have enough room for the pointer already |
Chris Mason | 97571fd | 2007-02-24 13:39:08 -0500 | [diff] [blame] | 1319 | * |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1320 | * slot and level indicate where you want the key to go, and |
| 1321 | * blocknr is the block the key points to. |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1322 | * |
| 1323 | * returns zero on success and < 0 on any error |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1324 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 1325 | static int insert_ptr(struct btrfs_trans_handle *trans, struct btrfs_root |
| 1326 | *root, struct btrfs_path *path, struct btrfs_disk_key |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1327 | *key, u64 bytenr, int slot, int level) |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1328 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1329 | struct extent_buffer *lower; |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1330 | int nritems; |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 1331 | |
| 1332 | BUG_ON(!path->nodes[level]); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1333 | lower = path->nodes[level]; |
| 1334 | nritems = btrfs_header_nritems(lower); |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1335 | if (slot > nritems) |
| 1336 | BUG(); |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 1337 | if (nritems == BTRFS_NODEPTRS_PER_BLOCK(root)) |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1338 | BUG(); |
| 1339 | if (slot != nritems) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1340 | memmove_extent_buffer(lower, |
| 1341 | btrfs_node_key_ptr_offset(slot + 1), |
| 1342 | btrfs_node_key_ptr_offset(slot), |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 1343 | (nritems - slot) * sizeof(struct btrfs_key_ptr)); |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1344 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1345 | btrfs_set_node_key(lower, key, slot); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1346 | btrfs_set_node_blockptr(lower, slot, bytenr); |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1347 | WARN_ON(trans->transid == 0); |
| 1348 | btrfs_set_node_ptr_generation(lower, slot, trans->transid); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1349 | btrfs_set_header_nritems(lower, nritems + 1); |
| 1350 | btrfs_mark_buffer_dirty(lower); |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1351 | return 0; |
| 1352 | } |
| 1353 | |
Chris Mason | 97571fd | 2007-02-24 13:39:08 -0500 | [diff] [blame] | 1354 | /* |
| 1355 | * split the node at the specified level in path in two. |
| 1356 | * The path is corrected to point to the appropriate node after the split |
| 1357 | * |
| 1358 | * Before splitting this tries to make some room in the node by pushing |
| 1359 | * left and right, if either one works, it returns right away. |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1360 | * |
| 1361 | * returns 0 on success and < 0 on failure |
Chris Mason | 97571fd | 2007-02-24 13:39:08 -0500 | [diff] [blame] | 1362 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 1363 | static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root |
| 1364 | *root, struct btrfs_path *path, int level) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1365 | { |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1366 | u64 root_gen; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1367 | struct extent_buffer *c; |
| 1368 | struct extent_buffer *split; |
| 1369 | struct btrfs_disk_key disk_key; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1370 | int mid; |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 1371 | int ret; |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1372 | int wret; |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 1373 | u32 c_nritems; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1374 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1375 | c = path->nodes[level]; |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1376 | WARN_ON(btrfs_header_generation(c) != trans->transid); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1377 | if (c == root->node) { |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 1378 | /* trying to split the root, lets make a new one */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 1379 | ret = insert_new_root(trans, root, path, level + 1); |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 1380 | if (ret) |
| 1381 | return ret; |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 1382 | } else { |
| 1383 | ret = push_nodes_for_insert(trans, root, path, level); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1384 | c = path->nodes[level]; |
| 1385 | if (!ret && btrfs_header_nritems(c) < |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 1386 | BTRFS_NODEPTRS_PER_BLOCK(root) - 1) |
| 1387 | return 0; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1388 | if (ret < 0) |
| 1389 | return ret; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1390 | } |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 1391 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1392 | c_nritems = btrfs_header_nritems(c); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1393 | if (root->ref_cows) |
| 1394 | root_gen = trans->transid; |
| 1395 | else |
| 1396 | root_gen = 0; |
| 1397 | |
| 1398 | btrfs_node_key(c, &disk_key, 0); |
| 1399 | split = __btrfs_alloc_free_block(trans, root, root->nodesize, |
| 1400 | root->root_key.objectid, |
| 1401 | root_gen, |
| 1402 | btrfs_disk_key_objectid(&disk_key), |
| 1403 | level, c->start, 0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1404 | if (IS_ERR(split)) |
| 1405 | return PTR_ERR(split); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1406 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1407 | btrfs_set_header_flags(split, btrfs_header_flags(c)); |
| 1408 | btrfs_set_header_level(split, btrfs_header_level(c)); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1409 | btrfs_set_header_bytenr(split, split->start); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1410 | btrfs_set_header_generation(split, trans->transid); |
| 1411 | btrfs_set_header_owner(split, root->root_key.objectid); |
| 1412 | write_extent_buffer(split, root->fs_info->fsid, |
| 1413 | (unsigned long)btrfs_header_fsid(split), |
| 1414 | BTRFS_FSID_SIZE); |
| 1415 | |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 1416 | mid = (c_nritems + 1) / 2; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1417 | |
| 1418 | copy_extent_buffer(split, c, |
| 1419 | btrfs_node_key_ptr_offset(0), |
| 1420 | btrfs_node_key_ptr_offset(mid), |
| 1421 | (c_nritems - mid) * sizeof(struct btrfs_key_ptr)); |
| 1422 | btrfs_set_header_nritems(split, c_nritems - mid); |
| 1423 | btrfs_set_header_nritems(c, mid); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1424 | ret = 0; |
| 1425 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1426 | btrfs_mark_buffer_dirty(c); |
| 1427 | btrfs_mark_buffer_dirty(split); |
| 1428 | |
| 1429 | btrfs_node_key(split, &disk_key, 0); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1430 | wret = insert_ptr(trans, root, path, &disk_key, split->start, |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1431 | path->slots[level + 1] + 1, |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 1432 | level + 1); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1433 | if (wret) |
| 1434 | ret = wret; |
| 1435 | |
Chris Mason | 5de08d7 | 2007-02-24 06:24:44 -0500 | [diff] [blame] | 1436 | if (path->slots[level] >= mid) { |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 1437 | path->slots[level] -= mid; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1438 | free_extent_buffer(c); |
| 1439 | path->nodes[level] = split; |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 1440 | path->slots[level + 1] += 1; |
| 1441 | } else { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1442 | free_extent_buffer(split); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1443 | } |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1444 | return ret; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1445 | } |
| 1446 | |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1447 | /* |
| 1448 | * how many bytes are required to store the items in a leaf. start |
| 1449 | * and nr indicate which items in the leaf to check. This totals up the |
| 1450 | * space used both by the item structs and the item data |
| 1451 | */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1452 | static int leaf_space_used(struct extent_buffer *l, int start, int nr) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1453 | { |
| 1454 | int data_len; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1455 | int nritems = btrfs_header_nritems(l); |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1456 | int end = min(nritems, start + nr) - 1; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1457 | |
| 1458 | if (!nr) |
| 1459 | return 0; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1460 | data_len = btrfs_item_end_nr(l, start); |
| 1461 | data_len = data_len - btrfs_item_offset_nr(l, end); |
Chris Mason | 0783fcf | 2007-03-12 20:12:07 -0400 | [diff] [blame] | 1462 | data_len += sizeof(struct btrfs_item) * nr; |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1463 | WARN_ON(data_len < 0); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1464 | return data_len; |
| 1465 | } |
| 1466 | |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1467 | /* |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1468 | * The space between the end of the leaf items and |
| 1469 | * the start of the leaf data. IOW, how much room |
| 1470 | * the leaf has left for both items and data |
| 1471 | */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1472 | int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf) |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1473 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1474 | int nritems = btrfs_header_nritems(leaf); |
| 1475 | int ret; |
| 1476 | ret = BTRFS_LEAF_DATA_SIZE(root) - leaf_space_used(leaf, 0, nritems); |
| 1477 | if (ret < 0) { |
| 1478 | printk("leaf free space ret %d, leaf data size %lu, used %d nritems %d\n", |
Jens Axboe | ae2f541 | 2007-10-19 09:22:59 -0400 | [diff] [blame] | 1479 | ret, (unsigned long) BTRFS_LEAF_DATA_SIZE(root), |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1480 | leaf_space_used(leaf, 0, nritems), nritems); |
| 1481 | } |
| 1482 | return ret; |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1483 | } |
| 1484 | |
| 1485 | /* |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1486 | * push some data in the path leaf to the right, trying to free up at |
| 1487 | * least data_size bytes. returns zero if the push worked, nonzero otherwise |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1488 | * |
| 1489 | * returns 1 if the push failed because the other node didn't have enough |
| 1490 | * room, 0 if everything worked out and < 0 if there were major errors. |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1491 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 1492 | static int push_leaf_right(struct btrfs_trans_handle *trans, struct btrfs_root |
Chris Mason | 34a3821 | 2007-11-07 13:31:03 -0500 | [diff] [blame] | 1493 | *root, struct btrfs_path *path, int data_size, |
| 1494 | int empty) |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1495 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1496 | struct extent_buffer *left = path->nodes[0]; |
| 1497 | struct extent_buffer *right; |
| 1498 | struct extent_buffer *upper; |
| 1499 | struct btrfs_disk_key disk_key; |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1500 | int slot; |
Chris Mason | 34a3821 | 2007-11-07 13:31:03 -0500 | [diff] [blame] | 1501 | u32 i; |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1502 | int free_space; |
| 1503 | int push_space = 0; |
| 1504 | int push_items = 0; |
Chris Mason | 0783fcf | 2007-03-12 20:12:07 -0400 | [diff] [blame] | 1505 | struct btrfs_item *item; |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 1506 | u32 left_nritems; |
Chris Mason | 34a3821 | 2007-11-07 13:31:03 -0500 | [diff] [blame] | 1507 | u32 nr; |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 1508 | u32 right_nritems; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1509 | u32 data_end; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1510 | u32 this_item_size; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1511 | int ret; |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1512 | |
| 1513 | slot = path->slots[1]; |
| 1514 | if (!path->nodes[1]) { |
| 1515 | return 1; |
| 1516 | } |
| 1517 | upper = path->nodes[1]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1518 | if (slot >= btrfs_header_nritems(upper) - 1) |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1519 | return 1; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1520 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1521 | right = read_tree_block(root, btrfs_node_blockptr(upper, slot + 1), |
| 1522 | root->leafsize); |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 1523 | free_space = btrfs_leaf_free_space(root, right); |
Chris Mason | 0783fcf | 2007-03-12 20:12:07 -0400 | [diff] [blame] | 1524 | if (free_space < data_size + sizeof(struct btrfs_item)) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1525 | free_extent_buffer(right); |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 1526 | return 1; |
| 1527 | } |
| 1528 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1529 | /* cow and double check */ |
| 1530 | ret = btrfs_cow_block(trans, root, right, upper, |
| 1531 | slot + 1, &right); |
| 1532 | if (ret) { |
| 1533 | free_extent_buffer(right); |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 1534 | return 1; |
| 1535 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1536 | free_space = btrfs_leaf_free_space(root, right); |
| 1537 | if (free_space < data_size + sizeof(struct btrfs_item)) { |
| 1538 | free_extent_buffer(right); |
| 1539 | return 1; |
| 1540 | } |
| 1541 | |
| 1542 | left_nritems = btrfs_header_nritems(left); |
| 1543 | if (left_nritems == 0) { |
| 1544 | free_extent_buffer(right); |
| 1545 | return 1; |
| 1546 | } |
| 1547 | |
Chris Mason | 34a3821 | 2007-11-07 13:31:03 -0500 | [diff] [blame] | 1548 | if (empty) |
| 1549 | nr = 0; |
| 1550 | else |
| 1551 | nr = 1; |
| 1552 | |
| 1553 | i = left_nritems - 1; |
| 1554 | while (i >= nr) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1555 | item = btrfs_item_nr(left, i); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1556 | |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1557 | if (path->slots[0] == i) |
| 1558 | push_space += data_size + sizeof(*item); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1559 | |
| 1560 | if (!left->map_token) { |
| 1561 | map_extent_buffer(left, (unsigned long)item, |
| 1562 | sizeof(struct btrfs_item), |
| 1563 | &left->map_token, &left->kaddr, |
| 1564 | &left->map_start, &left->map_len, |
| 1565 | KM_USER1); |
| 1566 | } |
| 1567 | |
| 1568 | this_item_size = btrfs_item_size(left, item); |
| 1569 | if (this_item_size + sizeof(*item) + push_space > free_space) |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1570 | break; |
| 1571 | push_items++; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1572 | push_space += this_item_size + sizeof(*item); |
Chris Mason | 34a3821 | 2007-11-07 13:31:03 -0500 | [diff] [blame] | 1573 | if (i == 0) |
| 1574 | break; |
| 1575 | i--; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1576 | } |
| 1577 | if (left->map_token) { |
| 1578 | unmap_extent_buffer(left, left->map_token, KM_USER1); |
| 1579 | left->map_token = NULL; |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1580 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1581 | |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1582 | if (push_items == 0) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1583 | free_extent_buffer(right); |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1584 | return 1; |
| 1585 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1586 | |
Chris Mason | 34a3821 | 2007-11-07 13:31:03 -0500 | [diff] [blame] | 1587 | if (!empty && push_items == left_nritems) |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 1588 | WARN_ON(1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1589 | |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1590 | /* push left to right */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1591 | right_nritems = btrfs_header_nritems(right); |
Chris Mason | 34a3821 | 2007-11-07 13:31:03 -0500 | [diff] [blame] | 1592 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1593 | push_space = btrfs_item_end_nr(left, left_nritems - push_items); |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 1594 | push_space -= leaf_data_end(root, left); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1595 | |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1596 | /* make room in the right data area */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1597 | data_end = leaf_data_end(root, right); |
| 1598 | memmove_extent_buffer(right, |
| 1599 | btrfs_leaf_data(right) + data_end - push_space, |
| 1600 | btrfs_leaf_data(right) + data_end, |
| 1601 | BTRFS_LEAF_DATA_SIZE(root) - data_end); |
| 1602 | |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1603 | /* copy from the left data area */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1604 | copy_extent_buffer(right, left, btrfs_leaf_data(right) + |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 1605 | BTRFS_LEAF_DATA_SIZE(root) - push_space, |
| 1606 | btrfs_leaf_data(left) + leaf_data_end(root, left), |
| 1607 | push_space); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1608 | |
| 1609 | memmove_extent_buffer(right, btrfs_item_nr_offset(push_items), |
| 1610 | btrfs_item_nr_offset(0), |
| 1611 | right_nritems * sizeof(struct btrfs_item)); |
| 1612 | |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1613 | /* copy the items from left to right */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1614 | copy_extent_buffer(right, left, btrfs_item_nr_offset(0), |
| 1615 | btrfs_item_nr_offset(left_nritems - push_items), |
| 1616 | push_items * sizeof(struct btrfs_item)); |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1617 | |
| 1618 | /* update the item pointers */ |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 1619 | right_nritems += push_items; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1620 | btrfs_set_header_nritems(right, right_nritems); |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 1621 | push_space = BTRFS_LEAF_DATA_SIZE(root); |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 1622 | for (i = 0; i < right_nritems; i++) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1623 | item = btrfs_item_nr(right, i); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1624 | if (!right->map_token) { |
| 1625 | map_extent_buffer(right, (unsigned long)item, |
| 1626 | sizeof(struct btrfs_item), |
| 1627 | &right->map_token, &right->kaddr, |
| 1628 | &right->map_start, &right->map_len, |
| 1629 | KM_USER1); |
| 1630 | } |
| 1631 | push_space -= btrfs_item_size(right, item); |
| 1632 | btrfs_set_item_offset(right, item, push_space); |
| 1633 | } |
| 1634 | |
| 1635 | if (right->map_token) { |
| 1636 | unmap_extent_buffer(right, right->map_token, KM_USER1); |
| 1637 | right->map_token = NULL; |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1638 | } |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 1639 | left_nritems -= push_items; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1640 | btrfs_set_header_nritems(left, left_nritems); |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1641 | |
Chris Mason | 34a3821 | 2007-11-07 13:31:03 -0500 | [diff] [blame] | 1642 | if (left_nritems) |
| 1643 | btrfs_mark_buffer_dirty(left); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1644 | btrfs_mark_buffer_dirty(right); |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 1645 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1646 | btrfs_item_key(right, &disk_key, 0); |
| 1647 | btrfs_set_node_key(upper, &disk_key, slot + 1); |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 1648 | btrfs_mark_buffer_dirty(upper); |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 1649 | |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1650 | /* then fixup the leaf pointer in the path */ |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 1651 | if (path->slots[0] >= left_nritems) { |
| 1652 | path->slots[0] -= left_nritems; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1653 | free_extent_buffer(path->nodes[0]); |
| 1654 | path->nodes[0] = right; |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1655 | path->slots[1] += 1; |
| 1656 | } else { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1657 | free_extent_buffer(right); |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1658 | } |
| 1659 | return 0; |
| 1660 | } |
| 1661 | /* |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1662 | * push some data in the path leaf to the left, trying to free up at |
| 1663 | * least data_size bytes. returns zero if the push worked, nonzero otherwise |
| 1664 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 1665 | static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root |
Chris Mason | 34a3821 | 2007-11-07 13:31:03 -0500 | [diff] [blame] | 1666 | *root, struct btrfs_path *path, int data_size, |
| 1667 | int empty) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1668 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1669 | struct btrfs_disk_key disk_key; |
| 1670 | struct extent_buffer *right = path->nodes[0]; |
| 1671 | struct extent_buffer *left; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1672 | int slot; |
| 1673 | int i; |
| 1674 | int free_space; |
| 1675 | int push_space = 0; |
| 1676 | int push_items = 0; |
Chris Mason | 0783fcf | 2007-03-12 20:12:07 -0400 | [diff] [blame] | 1677 | struct btrfs_item *item; |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 1678 | u32 old_left_nritems; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1679 | u32 right_nritems; |
Chris Mason | 34a3821 | 2007-11-07 13:31:03 -0500 | [diff] [blame] | 1680 | u32 nr; |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1681 | int ret = 0; |
| 1682 | int wret; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1683 | u32 this_item_size; |
| 1684 | u32 old_left_item_size; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1685 | |
| 1686 | slot = path->slots[1]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1687 | if (slot == 0) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1688 | return 1; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1689 | if (!path->nodes[1]) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1690 | return 1; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1691 | |
Chris Mason | 3685f79 | 2007-10-19 09:23:27 -0400 | [diff] [blame] | 1692 | right_nritems = btrfs_header_nritems(right); |
| 1693 | if (right_nritems == 0) { |
| 1694 | return 1; |
| 1695 | } |
| 1696 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1697 | left = read_tree_block(root, btrfs_node_blockptr(path->nodes[1], |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1698 | slot - 1), root->leafsize); |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 1699 | free_space = btrfs_leaf_free_space(root, left); |
Chris Mason | 0783fcf | 2007-03-12 20:12:07 -0400 | [diff] [blame] | 1700 | if (free_space < data_size + sizeof(struct btrfs_item)) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1701 | free_extent_buffer(left); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1702 | return 1; |
| 1703 | } |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 1704 | |
| 1705 | /* cow and double check */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1706 | ret = btrfs_cow_block(trans, root, left, |
| 1707 | path->nodes[1], slot - 1, &left); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1708 | if (ret) { |
| 1709 | /* we hit -ENOSPC, but it isn't fatal here */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1710 | free_extent_buffer(left); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1711 | return 1; |
| 1712 | } |
Chris Mason | 3685f79 | 2007-10-19 09:23:27 -0400 | [diff] [blame] | 1713 | |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 1714 | free_space = btrfs_leaf_free_space(root, left); |
Chris Mason | 0783fcf | 2007-03-12 20:12:07 -0400 | [diff] [blame] | 1715 | if (free_space < data_size + sizeof(struct btrfs_item)) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1716 | free_extent_buffer(left); |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 1717 | return 1; |
| 1718 | } |
| 1719 | |
Chris Mason | 34a3821 | 2007-11-07 13:31:03 -0500 | [diff] [blame] | 1720 | if (empty) |
| 1721 | nr = right_nritems; |
| 1722 | else |
| 1723 | nr = right_nritems - 1; |
| 1724 | |
| 1725 | for (i = 0; i < nr; i++) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1726 | item = btrfs_item_nr(right, i); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1727 | if (!right->map_token) { |
| 1728 | map_extent_buffer(right, (unsigned long)item, |
| 1729 | sizeof(struct btrfs_item), |
| 1730 | &right->map_token, &right->kaddr, |
| 1731 | &right->map_start, &right->map_len, |
| 1732 | KM_USER1); |
| 1733 | } |
| 1734 | |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1735 | if (path->slots[0] == i) |
| 1736 | push_space += data_size + sizeof(*item); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1737 | |
| 1738 | this_item_size = btrfs_item_size(right, item); |
| 1739 | if (this_item_size + sizeof(*item) + push_space > free_space) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1740 | break; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1741 | |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1742 | push_items++; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1743 | push_space += this_item_size + sizeof(*item); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1744 | } |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1745 | |
| 1746 | if (right->map_token) { |
| 1747 | unmap_extent_buffer(right, right->map_token, KM_USER1); |
| 1748 | right->map_token = NULL; |
| 1749 | } |
| 1750 | |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1751 | if (push_items == 0) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1752 | free_extent_buffer(left); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1753 | return 1; |
| 1754 | } |
Chris Mason | 34a3821 | 2007-11-07 13:31:03 -0500 | [diff] [blame] | 1755 | if (!empty && push_items == btrfs_header_nritems(right)) |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 1756 | WARN_ON(1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1757 | |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1758 | /* push data from right to left */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1759 | copy_extent_buffer(left, right, |
| 1760 | btrfs_item_nr_offset(btrfs_header_nritems(left)), |
| 1761 | btrfs_item_nr_offset(0), |
| 1762 | push_items * sizeof(struct btrfs_item)); |
| 1763 | |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 1764 | push_space = BTRFS_LEAF_DATA_SIZE(root) - |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1765 | btrfs_item_offset_nr(right, push_items -1); |
| 1766 | |
| 1767 | copy_extent_buffer(left, right, btrfs_leaf_data(left) + |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 1768 | leaf_data_end(root, left) - push_space, |
| 1769 | btrfs_leaf_data(right) + |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1770 | btrfs_item_offset_nr(right, push_items - 1), |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 1771 | push_space); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1772 | old_left_nritems = btrfs_header_nritems(left); |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 1773 | BUG_ON(old_left_nritems < 0); |
| 1774 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1775 | old_left_item_size = btrfs_item_offset_nr(left, old_left_nritems - 1); |
Chris Mason | 0783fcf | 2007-03-12 20:12:07 -0400 | [diff] [blame] | 1776 | for (i = old_left_nritems; i < old_left_nritems + push_items; i++) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1777 | u32 ioff; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1778 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1779 | item = btrfs_item_nr(left, i); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1780 | if (!left->map_token) { |
| 1781 | map_extent_buffer(left, (unsigned long)item, |
| 1782 | sizeof(struct btrfs_item), |
| 1783 | &left->map_token, &left->kaddr, |
| 1784 | &left->map_start, &left->map_len, |
| 1785 | KM_USER1); |
| 1786 | } |
| 1787 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1788 | ioff = btrfs_item_offset(left, item); |
| 1789 | btrfs_set_item_offset(left, item, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1790 | ioff - (BTRFS_LEAF_DATA_SIZE(root) - old_left_item_size)); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1791 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1792 | btrfs_set_header_nritems(left, old_left_nritems + push_items); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1793 | if (left->map_token) { |
| 1794 | unmap_extent_buffer(left, left->map_token, KM_USER1); |
| 1795 | left->map_token = NULL; |
| 1796 | } |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1797 | |
| 1798 | /* fixup right node */ |
Chris Mason | 34a3821 | 2007-11-07 13:31:03 -0500 | [diff] [blame] | 1799 | if (push_items > right_nritems) { |
| 1800 | printk("push items %d nr %u\n", push_items, right_nritems); |
| 1801 | WARN_ON(1); |
| 1802 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1803 | |
Chris Mason | 34a3821 | 2007-11-07 13:31:03 -0500 | [diff] [blame] | 1804 | if (push_items < right_nritems) { |
| 1805 | push_space = btrfs_item_offset_nr(right, push_items - 1) - |
| 1806 | leaf_data_end(root, right); |
| 1807 | memmove_extent_buffer(right, btrfs_leaf_data(right) + |
| 1808 | BTRFS_LEAF_DATA_SIZE(root) - push_space, |
| 1809 | btrfs_leaf_data(right) + |
| 1810 | leaf_data_end(root, right), push_space); |
| 1811 | |
| 1812 | memmove_extent_buffer(right, btrfs_item_nr_offset(0), |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1813 | btrfs_item_nr_offset(push_items), |
| 1814 | (btrfs_header_nritems(right) - push_items) * |
| 1815 | sizeof(struct btrfs_item)); |
Chris Mason | 34a3821 | 2007-11-07 13:31:03 -0500 | [diff] [blame] | 1816 | } |
Yan | eef1c49 | 2007-11-26 10:58:13 -0500 | [diff] [blame] | 1817 | right_nritems -= push_items; |
| 1818 | btrfs_set_header_nritems(right, right_nritems); |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 1819 | push_space = BTRFS_LEAF_DATA_SIZE(root); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1820 | for (i = 0; i < right_nritems; i++) { |
| 1821 | item = btrfs_item_nr(right, i); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1822 | |
| 1823 | if (!right->map_token) { |
| 1824 | map_extent_buffer(right, (unsigned long)item, |
| 1825 | sizeof(struct btrfs_item), |
| 1826 | &right->map_token, &right->kaddr, |
| 1827 | &right->map_start, &right->map_len, |
| 1828 | KM_USER1); |
| 1829 | } |
| 1830 | |
| 1831 | push_space = push_space - btrfs_item_size(right, item); |
| 1832 | btrfs_set_item_offset(right, item, push_space); |
| 1833 | } |
| 1834 | if (right->map_token) { |
| 1835 | unmap_extent_buffer(right, right->map_token, KM_USER1); |
| 1836 | right->map_token = NULL; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1837 | } |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 1838 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1839 | btrfs_mark_buffer_dirty(left); |
Chris Mason | 34a3821 | 2007-11-07 13:31:03 -0500 | [diff] [blame] | 1840 | if (right_nritems) |
| 1841 | btrfs_mark_buffer_dirty(right); |
Chris Mason | 098f59c | 2007-05-11 11:33:21 -0400 | [diff] [blame] | 1842 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1843 | btrfs_item_key(right, &disk_key, 0); |
| 1844 | wret = fixup_low_keys(trans, root, path, &disk_key, 1); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1845 | if (wret) |
| 1846 | ret = wret; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1847 | |
| 1848 | /* then fixup the leaf pointer in the path */ |
| 1849 | if (path->slots[0] < push_items) { |
| 1850 | path->slots[0] += old_left_nritems; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1851 | free_extent_buffer(path->nodes[0]); |
| 1852 | path->nodes[0] = left; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1853 | path->slots[1] -= 1; |
| 1854 | } else { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1855 | free_extent_buffer(left); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1856 | path->slots[0] -= push_items; |
| 1857 | } |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 1858 | BUG_ON(path->slots[0] < 0); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1859 | return ret; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1860 | } |
| 1861 | |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1862 | /* |
| 1863 | * split the path's leaf in two, making sure there is at least data_size |
| 1864 | * available for the resulting leaf level of the path. |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1865 | * |
| 1866 | * returns 0 if all went well and < 0 on failure. |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1867 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 1868 | static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1869 | *root, struct btrfs_key *ins_key, |
Chris Mason | cc0c553 | 2007-10-25 15:42:57 -0400 | [diff] [blame] | 1870 | struct btrfs_path *path, int data_size, int extend) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1871 | { |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1872 | u64 root_gen; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1873 | struct extent_buffer *l; |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 1874 | u32 nritems; |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 1875 | int mid; |
| 1876 | int slot; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1877 | struct extent_buffer *right; |
Chris Mason | 0783fcf | 2007-03-12 20:12:07 -0400 | [diff] [blame] | 1878 | int space_needed = data_size + sizeof(struct btrfs_item); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1879 | int data_copy_size; |
| 1880 | int rt_data_off; |
| 1881 | int i; |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1882 | int ret = 0; |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1883 | int wret; |
Chris Mason | cc0c553 | 2007-10-25 15:42:57 -0400 | [diff] [blame] | 1884 | int double_split; |
| 1885 | int num_doubles = 0; |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1886 | struct btrfs_disk_key disk_key; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1887 | |
Chris Mason | cc0c553 | 2007-10-25 15:42:57 -0400 | [diff] [blame] | 1888 | if (extend) |
| 1889 | space_needed = data_size; |
| 1890 | |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1891 | if (root->ref_cows) |
| 1892 | root_gen = trans->transid; |
| 1893 | else |
| 1894 | root_gen = 0; |
| 1895 | |
Chris Mason | 4068947 | 2007-03-17 14:29:23 -0400 | [diff] [blame] | 1896 | /* first try to make some room by pushing left and right */ |
Chris Mason | 3685f79 | 2007-10-19 09:23:27 -0400 | [diff] [blame] | 1897 | if (ins_key->type != BTRFS_DIR_ITEM_KEY) { |
Chris Mason | 34a3821 | 2007-11-07 13:31:03 -0500 | [diff] [blame] | 1898 | wret = push_leaf_right(trans, root, path, data_size, 0); |
Chris Mason | 3685f79 | 2007-10-19 09:23:27 -0400 | [diff] [blame] | 1899 | if (wret < 0) { |
Chris Mason | eaee50e | 2007-03-13 11:17:52 -0400 | [diff] [blame] | 1900 | return wret; |
Chris Mason | 3685f79 | 2007-10-19 09:23:27 -0400 | [diff] [blame] | 1901 | } |
| 1902 | if (wret) { |
Chris Mason | 34a3821 | 2007-11-07 13:31:03 -0500 | [diff] [blame] | 1903 | wret = push_leaf_left(trans, root, path, data_size, 0); |
Chris Mason | 3685f79 | 2007-10-19 09:23:27 -0400 | [diff] [blame] | 1904 | if (wret < 0) |
| 1905 | return wret; |
| 1906 | } |
| 1907 | l = path->nodes[0]; |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1908 | |
Chris Mason | 3685f79 | 2007-10-19 09:23:27 -0400 | [diff] [blame] | 1909 | /* did the pushes work? */ |
Chris Mason | cc0c553 | 2007-10-25 15:42:57 -0400 | [diff] [blame] | 1910 | if (btrfs_leaf_free_space(root, l) >= space_needed) |
Chris Mason | 3685f79 | 2007-10-19 09:23:27 -0400 | [diff] [blame] | 1911 | return 0; |
Chris Mason | 3326d1b | 2007-10-15 16:18:25 -0400 | [diff] [blame] | 1912 | } |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1913 | |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 1914 | if (!path->nodes[1]) { |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 1915 | ret = insert_new_root(trans, root, path, 1); |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 1916 | if (ret) |
| 1917 | return ret; |
| 1918 | } |
Chris Mason | cc0c553 | 2007-10-25 15:42:57 -0400 | [diff] [blame] | 1919 | again: |
| 1920 | double_split = 0; |
| 1921 | l = path->nodes[0]; |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 1922 | slot = path->slots[0]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1923 | nritems = btrfs_header_nritems(l); |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 1924 | mid = (nritems + 1)/ 2; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1925 | |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1926 | btrfs_item_key(l, &disk_key, 0); |
| 1927 | |
| 1928 | right = __btrfs_alloc_free_block(trans, root, root->leafsize, |
| 1929 | root->root_key.objectid, |
| 1930 | root_gen, disk_key.objectid, 0, |
| 1931 | l->start, 0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1932 | if (IS_ERR(right)) |
| 1933 | return PTR_ERR(right); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1934 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1935 | memset_extent_buffer(right, 0, 0, sizeof(struct btrfs_header)); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1936 | btrfs_set_header_bytenr(right, right->start); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1937 | btrfs_set_header_generation(right, trans->transid); |
| 1938 | btrfs_set_header_owner(right, root->root_key.objectid); |
| 1939 | btrfs_set_header_level(right, 0); |
| 1940 | write_extent_buffer(right, root->fs_info->fsid, |
| 1941 | (unsigned long)btrfs_header_fsid(right), |
| 1942 | BTRFS_FSID_SIZE); |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1943 | if (mid <= slot) { |
| 1944 | if (nritems == 1 || |
| 1945 | leaf_space_used(l, mid, nritems - mid) + space_needed > |
| 1946 | BTRFS_LEAF_DATA_SIZE(root)) { |
| 1947 | if (slot >= nritems) { |
| 1948 | btrfs_cpu_key_to_disk(&disk_key, ins_key); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1949 | btrfs_set_header_nritems(right, 0); |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1950 | wret = insert_ptr(trans, root, path, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1951 | &disk_key, right->start, |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1952 | path->slots[1] + 1, 1); |
| 1953 | if (wret) |
| 1954 | ret = wret; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1955 | free_extent_buffer(path->nodes[0]); |
| 1956 | path->nodes[0] = right; |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1957 | path->slots[0] = 0; |
| 1958 | path->slots[1] += 1; |
| 1959 | return ret; |
| 1960 | } |
| 1961 | mid = slot; |
Chris Mason | 3326d1b | 2007-10-15 16:18:25 -0400 | [diff] [blame] | 1962 | if (mid != nritems && |
| 1963 | leaf_space_used(l, mid, nritems - mid) + |
| 1964 | space_needed > BTRFS_LEAF_DATA_SIZE(root)) { |
| 1965 | double_split = 1; |
| 1966 | } |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1967 | } |
| 1968 | } else { |
| 1969 | if (leaf_space_used(l, 0, mid + 1) + space_needed > |
| 1970 | BTRFS_LEAF_DATA_SIZE(root)) { |
Chris Mason | cc0c553 | 2007-10-25 15:42:57 -0400 | [diff] [blame] | 1971 | if (!extend && slot == 0) { |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1972 | btrfs_cpu_key_to_disk(&disk_key, ins_key); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1973 | btrfs_set_header_nritems(right, 0); |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1974 | wret = insert_ptr(trans, root, path, |
| 1975 | &disk_key, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1976 | right->start, |
Chris Mason | 098f59c | 2007-05-11 11:33:21 -0400 | [diff] [blame] | 1977 | path->slots[1], 1); |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1978 | if (wret) |
| 1979 | ret = wret; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1980 | free_extent_buffer(path->nodes[0]); |
| 1981 | path->nodes[0] = right; |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1982 | path->slots[0] = 0; |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 1983 | if (path->slots[1] == 0) { |
| 1984 | wret = fixup_low_keys(trans, root, |
| 1985 | path, &disk_key, 1); |
| 1986 | if (wret) |
| 1987 | ret = wret; |
| 1988 | } |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1989 | return ret; |
Chris Mason | cc0c553 | 2007-10-25 15:42:57 -0400 | [diff] [blame] | 1990 | } else if (extend && slot == 0) { |
| 1991 | mid = 1; |
| 1992 | } else { |
| 1993 | mid = slot; |
| 1994 | if (mid != nritems && |
| 1995 | leaf_space_used(l, mid, nritems - mid) + |
| 1996 | space_needed > BTRFS_LEAF_DATA_SIZE(root)) { |
| 1997 | double_split = 1; |
| 1998 | } |
Chris Mason | 5ee78ac | 2007-10-19 14:01:21 -0400 | [diff] [blame] | 1999 | } |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 2000 | } |
| 2001 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2002 | nritems = nritems - mid; |
| 2003 | btrfs_set_header_nritems(right, nritems); |
| 2004 | data_copy_size = btrfs_item_end_nr(l, mid) - leaf_data_end(root, l); |
| 2005 | |
| 2006 | copy_extent_buffer(right, l, btrfs_item_nr_offset(0), |
| 2007 | btrfs_item_nr_offset(mid), |
| 2008 | nritems * sizeof(struct btrfs_item)); |
| 2009 | |
| 2010 | copy_extent_buffer(right, l, |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 2011 | btrfs_leaf_data(right) + BTRFS_LEAF_DATA_SIZE(root) - |
| 2012 | data_copy_size, btrfs_leaf_data(l) + |
| 2013 | leaf_data_end(root, l), data_copy_size); |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 2014 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2015 | rt_data_off = BTRFS_LEAF_DATA_SIZE(root) - |
| 2016 | btrfs_item_end_nr(l, mid); |
| 2017 | |
| 2018 | for (i = 0; i < nritems; i++) { |
| 2019 | struct btrfs_item *item = btrfs_item_nr(right, i); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2020 | u32 ioff; |
| 2021 | |
| 2022 | if (!right->map_token) { |
| 2023 | map_extent_buffer(right, (unsigned long)item, |
| 2024 | sizeof(struct btrfs_item), |
| 2025 | &right->map_token, &right->kaddr, |
| 2026 | &right->map_start, &right->map_len, |
| 2027 | KM_USER1); |
| 2028 | } |
| 2029 | |
| 2030 | ioff = btrfs_item_offset(right, item); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2031 | btrfs_set_item_offset(right, item, ioff + rt_data_off); |
Chris Mason | 0783fcf | 2007-03-12 20:12:07 -0400 | [diff] [blame] | 2032 | } |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 2033 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2034 | if (right->map_token) { |
| 2035 | unmap_extent_buffer(right, right->map_token, KM_USER1); |
| 2036 | right->map_token = NULL; |
| 2037 | } |
| 2038 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2039 | btrfs_set_header_nritems(l, mid); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 2040 | ret = 0; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2041 | btrfs_item_key(right, &disk_key, 0); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2042 | wret = insert_ptr(trans, root, path, &disk_key, right->start, |
| 2043 | path->slots[1] + 1, 1); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 2044 | if (wret) |
| 2045 | ret = wret; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2046 | |
| 2047 | btrfs_mark_buffer_dirty(right); |
| 2048 | btrfs_mark_buffer_dirty(l); |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 2049 | BUG_ON(path->slots[0] != slot); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2050 | |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2051 | if (mid <= slot) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2052 | free_extent_buffer(path->nodes[0]); |
| 2053 | path->nodes[0] = right; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2054 | path->slots[0] -= mid; |
| 2055 | path->slots[1] += 1; |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 2056 | } else |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2057 | free_extent_buffer(right); |
| 2058 | |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 2059 | BUG_ON(path->slots[0] < 0); |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 2060 | |
Chris Mason | cc0c553 | 2007-10-25 15:42:57 -0400 | [diff] [blame] | 2061 | if (double_split) { |
| 2062 | BUG_ON(num_doubles != 0); |
| 2063 | num_doubles++; |
| 2064 | goto again; |
Chris Mason | 3326d1b | 2007-10-15 16:18:25 -0400 | [diff] [blame] | 2065 | } |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2066 | return ret; |
| 2067 | } |
| 2068 | |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 2069 | int btrfs_truncate_item(struct btrfs_trans_handle *trans, |
| 2070 | struct btrfs_root *root, |
| 2071 | struct btrfs_path *path, |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 2072 | u32 new_size, int from_end) |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 2073 | { |
| 2074 | int ret = 0; |
| 2075 | int slot; |
| 2076 | int slot_orig; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2077 | struct extent_buffer *leaf; |
| 2078 | struct btrfs_item *item; |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 2079 | u32 nritems; |
| 2080 | unsigned int data_end; |
| 2081 | unsigned int old_data_start; |
| 2082 | unsigned int old_size; |
| 2083 | unsigned int size_diff; |
| 2084 | int i; |
| 2085 | |
| 2086 | slot_orig = path->slots[0]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2087 | leaf = path->nodes[0]; |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 2088 | slot = path->slots[0]; |
| 2089 | |
| 2090 | old_size = btrfs_item_size_nr(leaf, slot); |
| 2091 | if (old_size == new_size) |
| 2092 | return 0; |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 2093 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2094 | nritems = btrfs_header_nritems(leaf); |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 2095 | data_end = leaf_data_end(root, leaf); |
| 2096 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2097 | old_data_start = btrfs_item_offset_nr(leaf, slot); |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 2098 | |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 2099 | size_diff = old_size - new_size; |
| 2100 | |
| 2101 | BUG_ON(slot < 0); |
| 2102 | BUG_ON(slot >= nritems); |
| 2103 | |
| 2104 | /* |
| 2105 | * item0..itemN ... dataN.offset..dataN.size .. data0.size |
| 2106 | */ |
| 2107 | /* first correct the data pointers */ |
| 2108 | for (i = slot; i < nritems; i++) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2109 | u32 ioff; |
| 2110 | item = btrfs_item_nr(leaf, i); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2111 | |
| 2112 | if (!leaf->map_token) { |
| 2113 | map_extent_buffer(leaf, (unsigned long)item, |
| 2114 | sizeof(struct btrfs_item), |
| 2115 | &leaf->map_token, &leaf->kaddr, |
| 2116 | &leaf->map_start, &leaf->map_len, |
| 2117 | KM_USER1); |
| 2118 | } |
| 2119 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2120 | ioff = btrfs_item_offset(leaf, item); |
| 2121 | btrfs_set_item_offset(leaf, item, ioff + size_diff); |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 2122 | } |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2123 | |
| 2124 | if (leaf->map_token) { |
| 2125 | unmap_extent_buffer(leaf, leaf->map_token, KM_USER1); |
| 2126 | leaf->map_token = NULL; |
| 2127 | } |
| 2128 | |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 2129 | /* shift the data */ |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 2130 | if (from_end) { |
| 2131 | memmove_extent_buffer(leaf, btrfs_leaf_data(leaf) + |
| 2132 | data_end + size_diff, btrfs_leaf_data(leaf) + |
| 2133 | data_end, old_data_start + new_size - data_end); |
| 2134 | } else { |
| 2135 | struct btrfs_disk_key disk_key; |
| 2136 | u64 offset; |
| 2137 | |
| 2138 | btrfs_item_key(leaf, &disk_key, slot); |
| 2139 | |
| 2140 | if (btrfs_disk_key_type(&disk_key) == BTRFS_EXTENT_DATA_KEY) { |
| 2141 | unsigned long ptr; |
| 2142 | struct btrfs_file_extent_item *fi; |
| 2143 | |
| 2144 | fi = btrfs_item_ptr(leaf, slot, |
| 2145 | struct btrfs_file_extent_item); |
| 2146 | fi = (struct btrfs_file_extent_item *)( |
| 2147 | (unsigned long)fi - size_diff); |
| 2148 | |
| 2149 | if (btrfs_file_extent_type(leaf, fi) == |
| 2150 | BTRFS_FILE_EXTENT_INLINE) { |
| 2151 | ptr = btrfs_item_ptr_offset(leaf, slot); |
| 2152 | memmove_extent_buffer(leaf, ptr, |
| 2153 | (unsigned long)fi, |
| 2154 | offsetof(struct btrfs_file_extent_item, |
| 2155 | disk_bytenr)); |
| 2156 | } |
| 2157 | } |
| 2158 | |
| 2159 | memmove_extent_buffer(leaf, btrfs_leaf_data(leaf) + |
| 2160 | data_end + size_diff, btrfs_leaf_data(leaf) + |
| 2161 | data_end, old_data_start - data_end); |
| 2162 | |
| 2163 | offset = btrfs_disk_key_offset(&disk_key); |
| 2164 | btrfs_set_disk_key_offset(&disk_key, offset + size_diff); |
| 2165 | btrfs_set_item_key(leaf, &disk_key, slot); |
| 2166 | if (slot == 0) |
| 2167 | fixup_low_keys(trans, root, path, &disk_key, 1); |
| 2168 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2169 | |
| 2170 | item = btrfs_item_nr(leaf, slot); |
| 2171 | btrfs_set_item_size(leaf, item, new_size); |
| 2172 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 2173 | |
| 2174 | ret = 0; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2175 | if (btrfs_leaf_free_space(root, leaf) < 0) { |
| 2176 | btrfs_print_leaf(root, leaf); |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 2177 | BUG(); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2178 | } |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 2179 | return ret; |
| 2180 | } |
| 2181 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2182 | int btrfs_extend_item(struct btrfs_trans_handle *trans, |
| 2183 | struct btrfs_root *root, struct btrfs_path *path, |
| 2184 | u32 data_size) |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 2185 | { |
| 2186 | int ret = 0; |
| 2187 | int slot; |
| 2188 | int slot_orig; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2189 | struct extent_buffer *leaf; |
| 2190 | struct btrfs_item *item; |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 2191 | u32 nritems; |
| 2192 | unsigned int data_end; |
| 2193 | unsigned int old_data; |
| 2194 | unsigned int old_size; |
| 2195 | int i; |
| 2196 | |
| 2197 | slot_orig = path->slots[0]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2198 | leaf = path->nodes[0]; |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 2199 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2200 | nritems = btrfs_header_nritems(leaf); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 2201 | data_end = leaf_data_end(root, leaf); |
| 2202 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2203 | if (btrfs_leaf_free_space(root, leaf) < data_size) { |
| 2204 | btrfs_print_leaf(root, leaf); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 2205 | BUG(); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2206 | } |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 2207 | slot = path->slots[0]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2208 | old_data = btrfs_item_end_nr(leaf, slot); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 2209 | |
| 2210 | BUG_ON(slot < 0); |
Chris Mason | 3326d1b | 2007-10-15 16:18:25 -0400 | [diff] [blame] | 2211 | if (slot >= nritems) { |
| 2212 | btrfs_print_leaf(root, leaf); |
| 2213 | printk("slot %d too large, nritems %d\n", slot, nritems); |
| 2214 | BUG_ON(1); |
| 2215 | } |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 2216 | |
| 2217 | /* |
| 2218 | * item0..itemN ... dataN.offset..dataN.size .. data0.size |
| 2219 | */ |
| 2220 | /* first correct the data pointers */ |
| 2221 | for (i = slot; i < nritems; i++) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2222 | u32 ioff; |
| 2223 | item = btrfs_item_nr(leaf, i); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2224 | |
| 2225 | if (!leaf->map_token) { |
| 2226 | map_extent_buffer(leaf, (unsigned long)item, |
| 2227 | sizeof(struct btrfs_item), |
| 2228 | &leaf->map_token, &leaf->kaddr, |
| 2229 | &leaf->map_start, &leaf->map_len, |
| 2230 | KM_USER1); |
| 2231 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2232 | ioff = btrfs_item_offset(leaf, item); |
| 2233 | btrfs_set_item_offset(leaf, item, ioff - data_size); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 2234 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2235 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2236 | if (leaf->map_token) { |
| 2237 | unmap_extent_buffer(leaf, leaf->map_token, KM_USER1); |
| 2238 | leaf->map_token = NULL; |
| 2239 | } |
| 2240 | |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 2241 | /* shift the data */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2242 | memmove_extent_buffer(leaf, btrfs_leaf_data(leaf) + |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 2243 | data_end - data_size, btrfs_leaf_data(leaf) + |
| 2244 | data_end, old_data - data_end); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2245 | |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 2246 | data_end = old_data; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2247 | old_size = btrfs_item_size_nr(leaf, slot); |
| 2248 | item = btrfs_item_nr(leaf, slot); |
| 2249 | btrfs_set_item_size(leaf, item, old_size + data_size); |
| 2250 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 2251 | |
| 2252 | ret = 0; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2253 | if (btrfs_leaf_free_space(root, leaf) < 0) { |
| 2254 | btrfs_print_leaf(root, leaf); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 2255 | BUG(); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2256 | } |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 2257 | return ret; |
| 2258 | } |
| 2259 | |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 2260 | /* |
| 2261 | * Given a key and some data, insert an item into the tree. |
| 2262 | * This does all the path init required, making room in the tree if needed. |
| 2263 | */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2264 | int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, |
| 2265 | struct btrfs_root *root, |
| 2266 | struct btrfs_path *path, |
| 2267 | struct btrfs_key *cpu_key, u32 data_size) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2268 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2269 | struct extent_buffer *leaf; |
| 2270 | struct btrfs_item *item; |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 2271 | int ret = 0; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2272 | int slot; |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 2273 | int slot_orig; |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 2274 | u32 nritems; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2275 | unsigned int data_end; |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 2276 | struct btrfs_disk_key disk_key; |
| 2277 | |
| 2278 | btrfs_cpu_key_to_disk(&disk_key, cpu_key); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2279 | |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 2280 | /* create a root if there isn't one */ |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 2281 | if (!root->node) |
Chris Mason | cfaa729 | 2007-02-21 17:04:57 -0500 | [diff] [blame] | 2282 | BUG(); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2283 | |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 2284 | ret = btrfs_search_slot(trans, root, cpu_key, path, data_size, 1); |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 2285 | if (ret == 0) { |
Chris Mason | f0930a3 | 2007-03-02 09:47:58 -0500 | [diff] [blame] | 2286 | return -EEXIST; |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 2287 | } |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 2288 | if (ret < 0) |
| 2289 | goto out; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2290 | |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 2291 | slot_orig = path->slots[0]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2292 | leaf = path->nodes[0]; |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 2293 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2294 | nritems = btrfs_header_nritems(leaf); |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 2295 | data_end = leaf_data_end(root, leaf); |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 2296 | |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 2297 | if (btrfs_leaf_free_space(root, leaf) < |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 2298 | sizeof(struct btrfs_item) + data_size) { |
Chris Mason | 3326d1b | 2007-10-15 16:18:25 -0400 | [diff] [blame] | 2299 | btrfs_print_leaf(root, leaf); |
| 2300 | printk("not enough freespace need %u have %d\n", |
| 2301 | data_size, btrfs_leaf_free_space(root, leaf)); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2302 | BUG(); |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 2303 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2304 | |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 2305 | slot = path->slots[0]; |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 2306 | BUG_ON(slot < 0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2307 | |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2308 | if (slot != nritems) { |
| 2309 | int i; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2310 | unsigned int old_data = btrfs_item_end_nr(leaf, slot); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2311 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2312 | if (old_data < data_end) { |
| 2313 | btrfs_print_leaf(root, leaf); |
| 2314 | printk("slot %d old_data %d data_end %d\n", |
| 2315 | slot, old_data, data_end); |
| 2316 | BUG_ON(1); |
| 2317 | } |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2318 | /* |
| 2319 | * item0..itemN ... dataN.offset..dataN.size .. data0.size |
| 2320 | */ |
| 2321 | /* first correct the data pointers */ |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2322 | WARN_ON(leaf->map_token); |
Chris Mason | 0783fcf | 2007-03-12 20:12:07 -0400 | [diff] [blame] | 2323 | for (i = slot; i < nritems; i++) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2324 | u32 ioff; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2325 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2326 | item = btrfs_item_nr(leaf, i); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2327 | if (!leaf->map_token) { |
| 2328 | map_extent_buffer(leaf, (unsigned long)item, |
| 2329 | sizeof(struct btrfs_item), |
| 2330 | &leaf->map_token, &leaf->kaddr, |
| 2331 | &leaf->map_start, &leaf->map_len, |
| 2332 | KM_USER1); |
| 2333 | } |
| 2334 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2335 | ioff = btrfs_item_offset(leaf, item); |
| 2336 | btrfs_set_item_offset(leaf, item, ioff - data_size); |
Chris Mason | 0783fcf | 2007-03-12 20:12:07 -0400 | [diff] [blame] | 2337 | } |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2338 | if (leaf->map_token) { |
| 2339 | unmap_extent_buffer(leaf, leaf->map_token, KM_USER1); |
| 2340 | leaf->map_token = NULL; |
| 2341 | } |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2342 | |
| 2343 | /* shift the items */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2344 | memmove_extent_buffer(leaf, btrfs_item_nr_offset(slot + 1), |
| 2345 | btrfs_item_nr_offset(slot), |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 2346 | (nritems - slot) * sizeof(struct btrfs_item)); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2347 | |
| 2348 | /* shift the data */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2349 | memmove_extent_buffer(leaf, btrfs_leaf_data(leaf) + |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 2350 | data_end - data_size, btrfs_leaf_data(leaf) + |
| 2351 | data_end, old_data - data_end); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2352 | data_end = old_data; |
| 2353 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2354 | |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 2355 | /* setup the item for the new data */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2356 | btrfs_set_item_key(leaf, &disk_key, slot); |
| 2357 | item = btrfs_item_nr(leaf, slot); |
| 2358 | btrfs_set_item_offset(leaf, item, data_end - data_size); |
| 2359 | btrfs_set_item_size(leaf, item, data_size); |
| 2360 | btrfs_set_header_nritems(leaf, nritems + 1); |
| 2361 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 2362 | |
| 2363 | ret = 0; |
Chris Mason | 8e19f2c | 2007-02-28 09:27:02 -0500 | [diff] [blame] | 2364 | if (slot == 0) |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 2365 | ret = fixup_low_keys(trans, root, path, &disk_key, 1); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 2366 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2367 | if (btrfs_leaf_free_space(root, leaf) < 0) { |
| 2368 | btrfs_print_leaf(root, leaf); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2369 | BUG(); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2370 | } |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 2371 | out: |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 2372 | return ret; |
| 2373 | } |
| 2374 | |
| 2375 | /* |
| 2376 | * Given a key and some data, insert an item into the tree. |
| 2377 | * This does all the path init required, making room in the tree if needed. |
| 2378 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 2379 | int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root |
| 2380 | *root, struct btrfs_key *cpu_key, void *data, u32 |
| 2381 | data_size) |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 2382 | { |
| 2383 | int ret = 0; |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 2384 | struct btrfs_path *path; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2385 | struct extent_buffer *leaf; |
| 2386 | unsigned long ptr; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 2387 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 2388 | path = btrfs_alloc_path(); |
| 2389 | BUG_ON(!path); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 2390 | ret = btrfs_insert_empty_item(trans, root, path, cpu_key, data_size); |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 2391 | if (!ret) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2392 | leaf = path->nodes[0]; |
| 2393 | ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); |
| 2394 | write_extent_buffer(leaf, data, ptr, data_size); |
| 2395 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 2396 | } |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 2397 | btrfs_free_path(path); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 2398 | return ret; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2399 | } |
| 2400 | |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 2401 | /* |
Chris Mason | 5de08d7 | 2007-02-24 06:24:44 -0500 | [diff] [blame] | 2402 | * delete the pointer from a given node. |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 2403 | * |
| 2404 | * If the delete empties a node, the node is removed from the tree, |
| 2405 | * continuing all the way the root if required. The root is converted into |
| 2406 | * a leaf if all the nodes are emptied. |
| 2407 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 2408 | static int del_ptr(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
| 2409 | struct btrfs_path *path, int level, int slot) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2410 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2411 | struct extent_buffer *parent = path->nodes[level]; |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 2412 | u32 nritems; |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 2413 | int ret = 0; |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 2414 | int wret; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2415 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2416 | nritems = btrfs_header_nritems(parent); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 2417 | if (slot != nritems -1) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2418 | memmove_extent_buffer(parent, |
| 2419 | btrfs_node_key_ptr_offset(slot), |
| 2420 | btrfs_node_key_ptr_offset(slot + 1), |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 2421 | sizeof(struct btrfs_key_ptr) * |
| 2422 | (nritems - slot - 1)); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 2423 | } |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 2424 | nritems--; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2425 | btrfs_set_header_nritems(parent, nritems); |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 2426 | if (nritems == 0 && parent == root->node) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2427 | BUG_ON(btrfs_header_level(root->node) != 1); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 2428 | /* just turn the root into a leaf and break */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2429 | btrfs_set_header_level(root->node, 0); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 2430 | } else if (slot == 0) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2431 | struct btrfs_disk_key disk_key; |
| 2432 | |
| 2433 | btrfs_node_key(parent, &disk_key, 0); |
| 2434 | wret = fixup_low_keys(trans, root, path, &disk_key, level + 1); |
Chris Mason | 0f70abe | 2007-02-28 16:46:22 -0500 | [diff] [blame] | 2435 | if (wret) |
| 2436 | ret = wret; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2437 | } |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 2438 | btrfs_mark_buffer_dirty(parent); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 2439 | return ret; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2440 | } |
| 2441 | |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 2442 | /* |
| 2443 | * delete the item at the leaf level in path. If that empties |
| 2444 | * the leaf, remove it from the tree |
| 2445 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 2446 | int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
| 2447 | struct btrfs_path *path) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2448 | { |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2449 | int slot; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2450 | struct extent_buffer *leaf; |
| 2451 | struct btrfs_item *item; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2452 | int doff; |
| 2453 | int dsize; |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 2454 | int ret = 0; |
| 2455 | int wret; |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 2456 | u32 nritems; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2457 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2458 | leaf = path->nodes[0]; |
Chris Mason | 4920c9a | 2007-01-26 16:38:42 -0500 | [diff] [blame] | 2459 | slot = path->slots[0]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2460 | doff = btrfs_item_offset_nr(leaf, slot); |
| 2461 | dsize = btrfs_item_size_nr(leaf, slot); |
| 2462 | nritems = btrfs_header_nritems(leaf); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2463 | |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 2464 | if (slot != nritems - 1) { |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2465 | int i; |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 2466 | int data_end = leaf_data_end(root, leaf); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2467 | |
| 2468 | memmove_extent_buffer(leaf, btrfs_leaf_data(leaf) + |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 2469 | data_end + dsize, |
| 2470 | btrfs_leaf_data(leaf) + data_end, |
| 2471 | doff - data_end); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2472 | |
Chris Mason | 0783fcf | 2007-03-12 20:12:07 -0400 | [diff] [blame] | 2473 | for (i = slot + 1; i < nritems; i++) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2474 | u32 ioff; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2475 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2476 | item = btrfs_item_nr(leaf, i); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2477 | if (!leaf->map_token) { |
| 2478 | map_extent_buffer(leaf, (unsigned long)item, |
| 2479 | sizeof(struct btrfs_item), |
| 2480 | &leaf->map_token, &leaf->kaddr, |
| 2481 | &leaf->map_start, &leaf->map_len, |
| 2482 | KM_USER1); |
| 2483 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2484 | ioff = btrfs_item_offset(leaf, item); |
| 2485 | btrfs_set_item_offset(leaf, item, ioff + dsize); |
Chris Mason | 0783fcf | 2007-03-12 20:12:07 -0400 | [diff] [blame] | 2486 | } |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2487 | |
| 2488 | if (leaf->map_token) { |
| 2489 | unmap_extent_buffer(leaf, leaf->map_token, KM_USER1); |
| 2490 | leaf->map_token = NULL; |
| 2491 | } |
| 2492 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2493 | memmove_extent_buffer(leaf, btrfs_item_nr_offset(slot), |
| 2494 | btrfs_item_nr_offset(slot + 1), |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 2495 | sizeof(struct btrfs_item) * |
| 2496 | (nritems - slot - 1)); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2497 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2498 | btrfs_set_header_nritems(leaf, nritems - 1); |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 2499 | nritems--; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2500 | |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 2501 | /* delete the leaf if we've emptied it */ |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 2502 | if (nritems == 0) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2503 | if (leaf == root->node) { |
| 2504 | btrfs_set_header_level(leaf, 0); |
Chris Mason | 9a8dd15 | 2007-02-23 08:38:36 -0500 | [diff] [blame] | 2505 | } else { |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2506 | u64 root_gen = btrfs_header_generation(path->nodes[1]); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2507 | clean_tree_block(trans, root, leaf); |
| 2508 | wait_on_tree_block_writeback(root, leaf); |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 2509 | wret = del_ptr(trans, root, path, 1, path->slots[1]); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 2510 | if (wret) |
| 2511 | ret = wret; |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 2512 | wret = btrfs_free_extent(trans, root, |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2513 | leaf->start, leaf->len, |
| 2514 | btrfs_header_owner(path->nodes[1]), |
| 2515 | root_gen, 0, 0, 1); |
Chris Mason | 0f70abe | 2007-02-28 16:46:22 -0500 | [diff] [blame] | 2516 | if (wret) |
| 2517 | ret = wret; |
Chris Mason | 9a8dd15 | 2007-02-23 08:38:36 -0500 | [diff] [blame] | 2518 | } |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2519 | } else { |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 2520 | int used = leaf_space_used(leaf, 0, nritems); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 2521 | if (slot == 0) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2522 | struct btrfs_disk_key disk_key; |
| 2523 | |
| 2524 | btrfs_item_key(leaf, &disk_key, 0); |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 2525 | wret = fixup_low_keys(trans, root, path, |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2526 | &disk_key, 1); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 2527 | if (wret) |
| 2528 | ret = wret; |
| 2529 | } |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 2530 | |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 2531 | /* delete the leaf if it is mostly empty */ |
Chris Mason | 7936ca3 | 2007-10-19 09:22:41 -0400 | [diff] [blame] | 2532 | if (used < BTRFS_LEAF_DATA_SIZE(root) / 3) { |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2533 | /* push_leaf_left fixes the path. |
| 2534 | * make sure the path still points to our leaf |
| 2535 | * for possible call to del_ptr below |
| 2536 | */ |
Chris Mason | 4920c9a | 2007-01-26 16:38:42 -0500 | [diff] [blame] | 2537 | slot = path->slots[1]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2538 | extent_buffer_get(leaf); |
| 2539 | |
Chris Mason | 34a3821 | 2007-11-07 13:31:03 -0500 | [diff] [blame] | 2540 | wret = push_leaf_right(trans, root, path, 1, 1); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 2541 | if (wret < 0 && wret != -ENOSPC) |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 2542 | ret = wret; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2543 | |
| 2544 | if (path->nodes[0] == leaf && |
| 2545 | btrfs_header_nritems(leaf)) { |
Chris Mason | 34a3821 | 2007-11-07 13:31:03 -0500 | [diff] [blame] | 2546 | wret = push_leaf_left(trans, root, path, 1, 1); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 2547 | if (wret < 0 && wret != -ENOSPC) |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 2548 | ret = wret; |
| 2549 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2550 | |
| 2551 | if (btrfs_header_nritems(leaf) == 0) { |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2552 | u64 root_gen; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2553 | u64 bytenr = leaf->start; |
| 2554 | u32 blocksize = leaf->len; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2555 | |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2556 | root_gen = btrfs_header_generation( |
| 2557 | path->nodes[1]); |
| 2558 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2559 | clean_tree_block(trans, root, leaf); |
| 2560 | wait_on_tree_block_writeback(root, leaf); |
| 2561 | |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 2562 | wret = del_ptr(trans, root, path, 1, slot); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 2563 | if (wret) |
| 2564 | ret = wret; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2565 | |
| 2566 | free_extent_buffer(leaf); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2567 | wret = btrfs_free_extent(trans, root, bytenr, |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2568 | blocksize, |
| 2569 | btrfs_header_owner(path->nodes[1]), |
| 2570 | root_gen, 0, 0, 1); |
Chris Mason | 0f70abe | 2007-02-28 16:46:22 -0500 | [diff] [blame] | 2571 | if (wret) |
| 2572 | ret = wret; |
Chris Mason | 5de08d7 | 2007-02-24 06:24:44 -0500 | [diff] [blame] | 2573 | } else { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2574 | btrfs_mark_buffer_dirty(leaf); |
| 2575 | free_extent_buffer(leaf); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2576 | } |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 2577 | } else { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2578 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2579 | } |
| 2580 | } |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 2581 | return ret; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2582 | } |
| 2583 | |
Chris Mason | 97571fd | 2007-02-24 13:39:08 -0500 | [diff] [blame] | 2584 | /* |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2585 | * walk up the tree as far as required to find the previous leaf. |
| 2586 | * returns 0 if it found something or 1 if there are no lesser leaves. |
| 2587 | * returns < 0 on io errors. |
| 2588 | */ |
| 2589 | int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path) |
| 2590 | { |
| 2591 | int slot; |
| 2592 | int level = 1; |
| 2593 | u64 bytenr; |
| 2594 | struct extent_buffer *c; |
| 2595 | struct extent_buffer *next = NULL; |
| 2596 | |
| 2597 | while(level < BTRFS_MAX_LEVEL) { |
| 2598 | if (!path->nodes[level]) |
| 2599 | return 1; |
| 2600 | |
| 2601 | slot = path->slots[level]; |
| 2602 | c = path->nodes[level]; |
| 2603 | if (slot == 0) { |
| 2604 | level++; |
| 2605 | if (level == BTRFS_MAX_LEVEL) |
| 2606 | return 1; |
| 2607 | continue; |
| 2608 | } |
| 2609 | slot--; |
| 2610 | |
| 2611 | bytenr = btrfs_node_blockptr(c, slot); |
| 2612 | if (next) |
| 2613 | free_extent_buffer(next); |
| 2614 | |
| 2615 | if (path->reada < 0) |
| 2616 | reada_for_search(root, path, level, slot); |
| 2617 | |
| 2618 | next = read_tree_block(root, bytenr, |
| 2619 | btrfs_level_size(root, level - 1)); |
| 2620 | break; |
| 2621 | } |
| 2622 | path->slots[level] = slot; |
| 2623 | while(1) { |
| 2624 | level--; |
| 2625 | c = path->nodes[level]; |
| 2626 | free_extent_buffer(c); |
| 2627 | path->nodes[level] = next; |
| 2628 | path->slots[level] = 0; |
| 2629 | if (!level) |
| 2630 | break; |
| 2631 | if (path->reada) |
| 2632 | reada_for_search(root, path, level, 0); |
| 2633 | next = read_tree_block(root, btrfs_node_blockptr(next, 0), |
| 2634 | btrfs_level_size(root, level - 1)); |
| 2635 | } |
| 2636 | return 0; |
| 2637 | } |
| 2638 | |
| 2639 | /* |
Chris Mason | 97571fd | 2007-02-24 13:39:08 -0500 | [diff] [blame] | 2640 | * walk up the tree as far as required to find the next leaf. |
Chris Mason | 0f70abe | 2007-02-28 16:46:22 -0500 | [diff] [blame] | 2641 | * returns 0 if it found something or 1 if there are no greater leaves. |
| 2642 | * returns < 0 on io errors. |
Chris Mason | 97571fd | 2007-02-24 13:39:08 -0500 | [diff] [blame] | 2643 | */ |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 2644 | int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path) |
Chris Mason | d97e63b | 2007-02-20 16:40:44 -0500 | [diff] [blame] | 2645 | { |
| 2646 | int slot; |
| 2647 | int level = 1; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2648 | u64 bytenr; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2649 | struct extent_buffer *c; |
| 2650 | struct extent_buffer *next = NULL; |
Chris Mason | d97e63b | 2007-02-20 16:40:44 -0500 | [diff] [blame] | 2651 | |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 2652 | while(level < BTRFS_MAX_LEVEL) { |
Chris Mason | d97e63b | 2007-02-20 16:40:44 -0500 | [diff] [blame] | 2653 | if (!path->nodes[level]) |
Chris Mason | 0f70abe | 2007-02-28 16:46:22 -0500 | [diff] [blame] | 2654 | return 1; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2655 | |
Chris Mason | d97e63b | 2007-02-20 16:40:44 -0500 | [diff] [blame] | 2656 | slot = path->slots[level] + 1; |
| 2657 | c = path->nodes[level]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2658 | if (slot >= btrfs_header_nritems(c)) { |
Chris Mason | d97e63b | 2007-02-20 16:40:44 -0500 | [diff] [blame] | 2659 | level++; |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2660 | if (level == BTRFS_MAX_LEVEL) |
| 2661 | return 1; |
Chris Mason | d97e63b | 2007-02-20 16:40:44 -0500 | [diff] [blame] | 2662 | continue; |
| 2663 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2664 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2665 | bytenr = btrfs_node_blockptr(c, slot); |
Chris Mason | cfaa729 | 2007-02-21 17:04:57 -0500 | [diff] [blame] | 2666 | if (next) |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2667 | free_extent_buffer(next); |
| 2668 | |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 2669 | if (path->reada) |
| 2670 | reada_for_search(root, path, level, slot); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2671 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2672 | next = read_tree_block(root, bytenr, |
| 2673 | btrfs_level_size(root, level -1)); |
Chris Mason | d97e63b | 2007-02-20 16:40:44 -0500 | [diff] [blame] | 2674 | break; |
| 2675 | } |
| 2676 | path->slots[level] = slot; |
| 2677 | while(1) { |
| 2678 | level--; |
| 2679 | c = path->nodes[level]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2680 | free_extent_buffer(c); |
Chris Mason | d97e63b | 2007-02-20 16:40:44 -0500 | [diff] [blame] | 2681 | path->nodes[level] = next; |
| 2682 | path->slots[level] = 0; |
| 2683 | if (!level) |
| 2684 | break; |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 2685 | if (path->reada) |
Yan | 3202061 | 2007-08-27 15:17:54 -0400 | [diff] [blame] | 2686 | reada_for_search(root, path, level, 0); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2687 | next = read_tree_block(root, btrfs_node_blockptr(next, 0), |
| 2688 | btrfs_level_size(root, level - 1)); |
Chris Mason | d97e63b | 2007-02-20 16:40:44 -0500 | [diff] [blame] | 2689 | } |
| 2690 | return 0; |
| 2691 | } |