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 | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 19 | #include <linux/highmem.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, |
| 29 | struct btrfs_path *path, int data_size); |
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 | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 80 | struct extent_buffer *cow; |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 81 | int ret = 0; |
| 82 | int different_trans = 0; |
| 83 | |
| 84 | WARN_ON(root->ref_cows && trans->transid != root->last_trans); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 85 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 86 | cow = btrfs_alloc_free_block(trans, root, buf->len, |
| 87 | search_start, empty_size); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 88 | if (IS_ERR(cow)) |
| 89 | return PTR_ERR(cow); |
| 90 | |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 91 | cow->alloc_addr = (unsigned long)__builtin_return_address(0); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 92 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 93 | copy_extent_buffer(cow, buf, 0, 0, cow->len); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 94 | btrfs_set_header_bytenr(cow, cow->start); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 95 | btrfs_set_header_generation(cow, trans->transid); |
| 96 | btrfs_set_header_owner(cow, root->root_key.objectid); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 97 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 98 | WARN_ON(btrfs_header_generation(buf) > trans->transid); |
| 99 | if (btrfs_header_generation(buf) != trans->transid) { |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 100 | different_trans = 1; |
| 101 | ret = btrfs_inc_ref(trans, root, buf); |
| 102 | if (ret) |
| 103 | return ret; |
| 104 | } else { |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 105 | clean_tree_block(trans, root, buf); |
| 106 | } |
| 107 | |
| 108 | if (buf == root->node) { |
| 109 | root->node = cow; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 110 | extent_buffer_get(cow); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 111 | if (buf != root->commit_root) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 112 | btrfs_free_extent(trans, root, buf->start, |
| 113 | buf->len, 1); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 114 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 115 | free_extent_buffer(buf); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 116 | } else { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 117 | btrfs_set_node_blockptr(parent, parent_slot, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 118 | cow->start); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 119 | btrfs_mark_buffer_dirty(parent); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 120 | WARN_ON(btrfs_header_generation(parent) != trans->transid); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 121 | btrfs_free_extent(trans, root, buf->start, buf->len, 1); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 122 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 123 | free_extent_buffer(buf); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 124 | btrfs_mark_buffer_dirty(cow); |
| 125 | *cow_ret = cow; |
| 126 | return 0; |
| 127 | } |
| 128 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 129 | int btrfs_cow_block(struct btrfs_trans_handle *trans, |
| 130 | struct btrfs_root *root, struct extent_buffer *buf, |
| 131 | struct extent_buffer *parent, int parent_slot, |
| 132 | struct extent_buffer **cow_ret) |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 133 | { |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 134 | u64 search_start; |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 135 | int ret; |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 136 | if (trans->transaction != root->fs_info->running_transaction) { |
| 137 | printk(KERN_CRIT "trans %Lu running %Lu\n", trans->transid, |
| 138 | root->fs_info->running_transaction->transid); |
| 139 | WARN_ON(1); |
| 140 | } |
| 141 | if (trans->transid != root->fs_info->generation) { |
| 142 | printk(KERN_CRIT "trans %Lu running %Lu\n", trans->transid, |
| 143 | root->fs_info->generation); |
| 144 | WARN_ON(1); |
| 145 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 146 | if (btrfs_header_generation(buf) == trans->transid) { |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 147 | *cow_ret = buf; |
| 148 | return 0; |
| 149 | } |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 150 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 151 | search_start = buf->start & ~((u64)BTRFS_BLOCK_GROUP_SIZE - 1); |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 152 | ret = __btrfs_cow_block(trans, root, buf, parent, |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 153 | parent_slot, cow_ret, search_start, 0); |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 154 | (*cow_ret)->alloc_addr = (unsigned long)__builtin_return_address(0); |
| 155 | return ret; |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 156 | } |
| 157 | |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame^] | 158 | static int close_blocks(u64 blocknr, u64 other, u32 blocksize) |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 159 | { |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame^] | 160 | if (blocknr < other && other - (blocknr + blocksize) < 32768) |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 161 | return 1; |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame^] | 162 | if (blocknr > other && blocknr - (other + blocksize) < 32768) |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 163 | return 1; |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 164 | return 0; |
| 165 | } |
| 166 | |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame^] | 167 | static int should_defrag_leaf(struct extent_buffer *leaf) |
Chris Mason | 2cc58cf | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 168 | { |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame^] | 169 | struct btrfs_key key; |
Chris Mason | 2cc58cf | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 170 | u32 nritems; |
| 171 | |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame^] | 172 | if (btrfs_buffer_defrag(leaf)) |
Chris Mason | 2cc58cf | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 173 | return 1; |
| 174 | |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame^] | 175 | nritems = btrfs_header_nritems(leaf); |
Chris Mason | 2cc58cf | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 176 | if (nritems == 0) |
| 177 | return 0; |
| 178 | |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame^] | 179 | btrfs_item_key_to_cpu(leaf, &key, 0); |
| 180 | if (key.type == BTRFS_DIR_ITEM_KEY) |
Chris Mason | 2cc58cf | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 181 | return 1; |
| 182 | |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame^] | 183 | |
| 184 | btrfs_item_key_to_cpu(leaf, &key, nritems - 1); |
| 185 | if (key.type == BTRFS_DIR_ITEM_KEY) |
Chris Mason | 2cc58cf | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 186 | return 1; |
| 187 | if (nritems > 4) { |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame^] | 188 | btrfs_item_key_to_cpu(leaf, &key, nritems / 2); |
| 189 | if (key.type == BTRFS_DIR_ITEM_KEY) |
Chris Mason | 2cc58cf | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 190 | return 1; |
| 191 | } |
| 192 | return 0; |
| 193 | } |
| 194 | |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 195 | int btrfs_realloc_node(struct btrfs_trans_handle *trans, |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 196 | struct btrfs_root *root, struct extent_buffer *parent, |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 197 | int cache_only, u64 *last_ret) |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 198 | { |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame^] | 199 | struct extent_buffer *cur; |
| 200 | struct extent_buffer *tmp; |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 201 | u64 blocknr; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 202 | u64 search_start = *last_ret; |
| 203 | u64 last_block = 0; |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 204 | u64 other; |
| 205 | u32 parent_nritems; |
| 206 | int start_slot; |
| 207 | int end_slot; |
| 208 | int i; |
| 209 | int err = 0; |
Chris Mason | f2183bd | 2007-08-10 14:42:37 -0400 | [diff] [blame] | 210 | int parent_level; |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame^] | 211 | int uptodate; |
| 212 | u32 blocksize; |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 213 | |
| 214 | if (trans->transaction != root->fs_info->running_transaction) { |
| 215 | printk(KERN_CRIT "trans %Lu running %Lu\n", trans->transid, |
| 216 | root->fs_info->running_transaction->transid); |
| 217 | WARN_ON(1); |
| 218 | } |
| 219 | if (trans->transid != root->fs_info->generation) { |
| 220 | printk(KERN_CRIT "trans %Lu running %Lu\n", trans->transid, |
| 221 | root->fs_info->generation); |
| 222 | WARN_ON(1); |
| 223 | } |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame^] | 224 | if (btrfs_buffer_defrag_done(parent)) |
Chris Mason | 86479a0 | 2007-09-10 19:58:16 -0400 | [diff] [blame] | 225 | return 0; |
| 226 | |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame^] | 227 | parent_nritems = btrfs_header_nritems(parent); |
| 228 | parent_level = btrfs_header_level(parent); |
| 229 | blocksize = btrfs_level_size(root, parent_level - 1); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 230 | |
| 231 | start_slot = 0; |
| 232 | end_slot = parent_nritems; |
| 233 | |
| 234 | if (parent_nritems == 1) |
| 235 | return 0; |
| 236 | |
| 237 | for (i = start_slot; i < end_slot; i++) { |
| 238 | int close = 1; |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame^] | 239 | blocknr = btrfs_node_blockptr(parent, i); |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 240 | if (last_block == 0) |
| 241 | last_block = blocknr; |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 242 | if (i > 0) { |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame^] | 243 | other = btrfs_node_blockptr(parent, i - 1); |
| 244 | close = close_blocks(blocknr, other, blocksize); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 245 | } |
| 246 | if (close && i < end_slot - 1) { |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame^] | 247 | other = btrfs_node_blockptr(parent, i + 1); |
| 248 | close = close_blocks(blocknr, other, blocksize); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 249 | } |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 250 | if (close) { |
| 251 | last_block = blocknr; |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 252 | continue; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 253 | } |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 254 | |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame^] | 255 | cur = btrfs_find_tree_block(root, blocknr, blocksize); |
| 256 | if (cur) |
| 257 | uptodate = btrfs_buffer_uptodate(cur); |
| 258 | else |
| 259 | uptodate = 0; |
| 260 | if (!cur || !uptodate || |
| 261 | (parent_level != 1 && !btrfs_buffer_defrag(cur)) || |
| 262 | (parent_level == 1 && !should_defrag_leaf(cur))) { |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 263 | if (cache_only) { |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame^] | 264 | free_extent_buffer(cur); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 265 | continue; |
| 266 | } |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame^] | 267 | if (!cur) { |
| 268 | cur = read_tree_block(root, blocknr, |
| 269 | blocksize); |
| 270 | } else if (!uptodate) { |
| 271 | btrfs_read_buffer(cur); |
Chris Mason | f2183bd | 2007-08-10 14:42:37 -0400 | [diff] [blame] | 272 | } |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 273 | } |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 274 | if (search_start == 0) |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame^] | 275 | search_start = last_block; |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 276 | |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame^] | 277 | err = __btrfs_cow_block(trans, root, cur, parent, i, |
| 278 | &tmp, search_start, |
| 279 | min(16 * blocksize, |
| 280 | (end_slot - i) * blocksize)); |
Yan | 252c38f | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 281 | if (err) { |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame^] | 282 | free_extent_buffer(cur); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 283 | break; |
Yan | 252c38f | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 284 | } |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame^] | 285 | search_start = tmp->start; |
Chris Mason | f2183bd | 2007-08-10 14:42:37 -0400 | [diff] [blame] | 286 | *last_ret = search_start; |
| 287 | if (parent_level == 1) |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame^] | 288 | btrfs_clear_buffer_defrag(tmp); |
| 289 | btrfs_set_buffer_defrag_done(tmp); |
| 290 | free_extent_buffer(tmp); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 291 | } |
| 292 | return err; |
| 293 | } |
| 294 | |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 295 | /* |
| 296 | * The leaf data grows from end-to-front in the node. |
| 297 | * this returns the address of the start of the last item, |
| 298 | * which is the stop of the leaf data stack |
| 299 | */ |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 300 | static inline unsigned int leaf_data_end(struct btrfs_root *root, |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 301 | struct extent_buffer *leaf) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 302 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 303 | u32 nr = btrfs_header_nritems(leaf); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 304 | if (nr == 0) |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 305 | return BTRFS_LEAF_DATA_SIZE(root); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 306 | return btrfs_item_offset_nr(leaf, nr - 1); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 307 | } |
| 308 | |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 309 | /* |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 310 | * compare two keys in a memcmp fashion |
| 311 | */ |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 312 | static int comp_keys(struct btrfs_disk_key *disk, struct btrfs_key *k2) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 313 | { |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 314 | struct btrfs_key k1; |
| 315 | |
| 316 | btrfs_disk_key_to_cpu(&k1, disk); |
| 317 | |
| 318 | if (k1.objectid > k2->objectid) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 319 | return 1; |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 320 | if (k1.objectid < k2->objectid) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 321 | return -1; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 322 | if (k1.type > k2->type) |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 323 | return 1; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 324 | if (k1.type < k2->type) |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 325 | return -1; |
Chris Mason | 70b2bef | 2007-04-17 15:39:32 -0400 | [diff] [blame] | 326 | if (k1.offset > k2->offset) |
| 327 | return 1; |
| 328 | if (k1.offset < k2->offset) |
| 329 | return -1; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 330 | return 0; |
| 331 | } |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 332 | |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 333 | static int check_node(struct btrfs_root *root, struct btrfs_path *path, |
| 334 | int level) |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 335 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 336 | struct extent_buffer *parent = NULL; |
| 337 | struct extent_buffer *node = path->nodes[level]; |
| 338 | struct btrfs_disk_key parent_key; |
| 339 | struct btrfs_disk_key node_key; |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 340 | int parent_slot; |
Chris Mason | 8d7be55 | 2007-05-10 11:24:42 -0400 | [diff] [blame] | 341 | int slot; |
| 342 | struct btrfs_key cpukey; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 343 | u32 nritems = btrfs_header_nritems(node); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 344 | |
| 345 | if (path->nodes[level + 1]) |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 346 | parent = path->nodes[level + 1]; |
Aneesh | a1f3963 | 2007-07-11 10:03:27 -0400 | [diff] [blame] | 347 | |
Chris Mason | 8d7be55 | 2007-05-10 11:24:42 -0400 | [diff] [blame] | 348 | slot = path->slots[level]; |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 349 | BUG_ON(nritems == 0); |
| 350 | if (parent) { |
Aneesh | a1f3963 | 2007-07-11 10:03:27 -0400 | [diff] [blame] | 351 | parent_slot = path->slots[level + 1]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 352 | btrfs_node_key(parent, &parent_key, parent_slot); |
| 353 | btrfs_node_key(node, &node_key, 0); |
| 354 | BUG_ON(memcmp(&parent_key, &node_key, |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 355 | sizeof(struct btrfs_disk_key))); |
Chris Mason | 1d4f8a0 | 2007-03-13 09:28:32 -0400 | [diff] [blame] | 356 | BUG_ON(btrfs_node_blockptr(parent, parent_slot) != |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 357 | btrfs_header_bytenr(node)); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 358 | } |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 359 | BUG_ON(nritems > BTRFS_NODEPTRS_PER_BLOCK(root)); |
Chris Mason | 8d7be55 | 2007-05-10 11:24:42 -0400 | [diff] [blame] | 360 | if (slot != 0) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 361 | btrfs_node_key_to_cpu(node, &cpukey, slot - 1); |
| 362 | btrfs_node_key(node, &node_key, slot); |
| 363 | BUG_ON(comp_keys(&node_key, &cpukey) <= 0); |
Chris Mason | 8d7be55 | 2007-05-10 11:24:42 -0400 | [diff] [blame] | 364 | } |
| 365 | if (slot < nritems - 1) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 366 | btrfs_node_key_to_cpu(node, &cpukey, slot + 1); |
| 367 | btrfs_node_key(node, &node_key, slot); |
| 368 | BUG_ON(comp_keys(&node_key, &cpukey) >= 0); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 369 | } |
| 370 | return 0; |
| 371 | } |
| 372 | |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 373 | static int check_leaf(struct btrfs_root *root, struct btrfs_path *path, |
| 374 | int level) |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 375 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 376 | struct extent_buffer *leaf = path->nodes[level]; |
| 377 | struct extent_buffer *parent = NULL; |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 378 | int parent_slot; |
Chris Mason | 8d7be55 | 2007-05-10 11:24:42 -0400 | [diff] [blame] | 379 | struct btrfs_key cpukey; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 380 | struct btrfs_disk_key parent_key; |
| 381 | struct btrfs_disk_key leaf_key; |
| 382 | int slot = path->slots[0]; |
Chris Mason | 8d7be55 | 2007-05-10 11:24:42 -0400 | [diff] [blame] | 383 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 384 | u32 nritems = btrfs_header_nritems(leaf); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 385 | |
| 386 | if (path->nodes[level + 1]) |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 387 | parent = path->nodes[level + 1]; |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 388 | |
| 389 | if (nritems == 0) |
| 390 | return 0; |
| 391 | |
| 392 | if (parent) { |
Aneesh | a1f3963 | 2007-07-11 10:03:27 -0400 | [diff] [blame] | 393 | parent_slot = path->slots[level + 1]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 394 | btrfs_node_key(parent, &parent_key, parent_slot); |
| 395 | btrfs_item_key(leaf, &leaf_key, 0); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 396 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 397 | BUG_ON(memcmp(&parent_key, &leaf_key, |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 398 | sizeof(struct btrfs_disk_key))); |
Chris Mason | 1d4f8a0 | 2007-03-13 09:28:32 -0400 | [diff] [blame] | 399 | BUG_ON(btrfs_node_blockptr(parent, parent_slot) != |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 400 | btrfs_header_bytenr(leaf)); |
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 | #if 0 |
| 403 | for (i = 0; nritems > 1 && i < nritems - 2; i++) { |
| 404 | btrfs_item_key_to_cpu(leaf, &cpukey, i + 1); |
| 405 | btrfs_item_key(leaf, &leaf_key, i); |
| 406 | if (comp_keys(&leaf_key, &cpukey) >= 0) { |
| 407 | btrfs_print_leaf(root, leaf); |
| 408 | printk("slot %d offset bad key\n", i); |
| 409 | BUG_ON(1); |
| 410 | } |
| 411 | if (btrfs_item_offset_nr(leaf, i) != |
| 412 | btrfs_item_end_nr(leaf, i + 1)) { |
| 413 | btrfs_print_leaf(root, leaf); |
| 414 | printk("slot %d offset bad\n", i); |
| 415 | BUG_ON(1); |
| 416 | } |
| 417 | if (i == 0) { |
| 418 | if (btrfs_item_offset_nr(leaf, i) + |
| 419 | btrfs_item_size_nr(leaf, i) != |
| 420 | BTRFS_LEAF_DATA_SIZE(root)) { |
| 421 | btrfs_print_leaf(root, leaf); |
| 422 | printk("slot %d first offset bad\n", i); |
| 423 | BUG_ON(1); |
| 424 | } |
| 425 | } |
| 426 | } |
| 427 | if (nritems > 0) { |
| 428 | if (btrfs_item_size_nr(leaf, nritems - 1) > 4096) { |
| 429 | btrfs_print_leaf(root, leaf); |
| 430 | printk("slot %d bad size \n", nritems - 1); |
| 431 | BUG_ON(1); |
| 432 | } |
| 433 | } |
| 434 | #endif |
| 435 | if (slot != 0 && slot < nritems - 1) { |
| 436 | btrfs_item_key(leaf, &leaf_key, slot); |
| 437 | btrfs_item_key_to_cpu(leaf, &cpukey, slot - 1); |
| 438 | if (comp_keys(&leaf_key, &cpukey) <= 0) { |
| 439 | btrfs_print_leaf(root, leaf); |
| 440 | printk("slot %d offset bad key\n", slot); |
| 441 | BUG_ON(1); |
| 442 | } |
| 443 | if (btrfs_item_offset_nr(leaf, slot - 1) != |
| 444 | btrfs_item_end_nr(leaf, slot)) { |
| 445 | btrfs_print_leaf(root, leaf); |
| 446 | printk("slot %d offset bad\n", slot); |
| 447 | BUG_ON(1); |
| 448 | } |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 449 | } |
Chris Mason | 8d7be55 | 2007-05-10 11:24:42 -0400 | [diff] [blame] | 450 | if (slot < nritems - 1) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 451 | btrfs_item_key(leaf, &leaf_key, slot); |
| 452 | btrfs_item_key_to_cpu(leaf, &cpukey, slot + 1); |
| 453 | BUG_ON(comp_keys(&leaf_key, &cpukey) >= 0); |
| 454 | if (btrfs_item_offset_nr(leaf, slot) != |
| 455 | btrfs_item_end_nr(leaf, slot + 1)) { |
| 456 | btrfs_print_leaf(root, leaf); |
| 457 | printk("slot %d offset bad\n", slot); |
| 458 | BUG_ON(1); |
| 459 | } |
Chris Mason | 8d7be55 | 2007-05-10 11:24:42 -0400 | [diff] [blame] | 460 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 461 | BUG_ON(btrfs_item_offset_nr(leaf, 0) + |
| 462 | btrfs_item_size_nr(leaf, 0) != BTRFS_LEAF_DATA_SIZE(root)); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 463 | return 0; |
| 464 | } |
| 465 | |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 466 | static int check_block(struct btrfs_root *root, struct btrfs_path *path, |
| 467 | int level) |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 468 | { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 469 | #if 0 |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 470 | struct extent_buffer *buf = path->nodes[level]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 471 | |
Chris Mason | 479965d | 2007-10-15 16:14:27 -0400 | [diff] [blame] | 472 | if (memcmp_extent_buffer(buf, root->fs_info->fsid, |
| 473 | (unsigned long)btrfs_header_fsid(buf), |
| 474 | BTRFS_FSID_SIZE)) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 475 | printk("warning bad block %Lu\n", buf->start); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 476 | return 1; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 477 | } |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 478 | #endif |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 479 | if (level == 0) |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 480 | return check_leaf(root, path, level); |
| 481 | return check_node(root, path, level); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 482 | } |
| 483 | |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 484 | /* |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 485 | * search for key in the extent_buffer. The items start at offset p, |
| 486 | * and they are item_size apart. There are 'max' items in p. |
| 487 | * |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 488 | * the slot in the array is returned via slot, and it points to |
| 489 | * the place where you would insert key if it is not found in |
| 490 | * the array. |
| 491 | * |
| 492 | * slot may point to max if the key is bigger than all of the keys |
| 493 | */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 494 | static int generic_bin_search(struct extent_buffer *eb, unsigned long p, |
| 495 | int item_size, struct btrfs_key *key, |
| 496 | int max, int *slot) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 497 | { |
| 498 | int low = 0; |
| 499 | int high = max; |
| 500 | int mid; |
| 501 | int ret; |
Chris Mason | 479965d | 2007-10-15 16:14:27 -0400 | [diff] [blame] | 502 | struct btrfs_disk_key *tmp = NULL; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 503 | struct btrfs_disk_key unaligned; |
| 504 | unsigned long offset; |
| 505 | char *map_token = NULL; |
| 506 | char *kaddr = NULL; |
| 507 | unsigned long map_start = 0; |
| 508 | unsigned long map_len = 0; |
Chris Mason | 479965d | 2007-10-15 16:14:27 -0400 | [diff] [blame] | 509 | int err; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 510 | |
| 511 | while(low < high) { |
| 512 | mid = (low + high) / 2; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 513 | offset = p + mid * item_size; |
| 514 | |
| 515 | if (!map_token || offset < map_start || |
| 516 | (offset + sizeof(struct btrfs_disk_key)) > |
| 517 | map_start + map_len) { |
Chris Mason | 479965d | 2007-10-15 16:14:27 -0400 | [diff] [blame] | 518 | if (map_token) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 519 | unmap_extent_buffer(eb, map_token, KM_USER0); |
Chris Mason | 479965d | 2007-10-15 16:14:27 -0400 | [diff] [blame] | 520 | map_token = NULL; |
| 521 | } |
| 522 | err = map_extent_buffer(eb, offset, |
| 523 | sizeof(struct btrfs_disk_key), |
| 524 | &map_token, &kaddr, |
| 525 | &map_start, &map_len, KM_USER0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 526 | |
Chris Mason | 479965d | 2007-10-15 16:14:27 -0400 | [diff] [blame] | 527 | if (!err) { |
| 528 | tmp = (struct btrfs_disk_key *)(kaddr + offset - |
| 529 | map_start); |
| 530 | } else { |
| 531 | read_extent_buffer(eb, &unaligned, |
| 532 | offset, sizeof(unaligned)); |
| 533 | tmp = &unaligned; |
| 534 | } |
| 535 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 536 | } else { |
| 537 | tmp = (struct btrfs_disk_key *)(kaddr + offset - |
| 538 | map_start); |
| 539 | } |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 540 | ret = comp_keys(tmp, key); |
| 541 | |
| 542 | if (ret < 0) |
| 543 | low = mid + 1; |
| 544 | else if (ret > 0) |
| 545 | high = mid; |
| 546 | else { |
| 547 | *slot = mid; |
Chris Mason | 479965d | 2007-10-15 16:14:27 -0400 | [diff] [blame] | 548 | if (map_token) |
| 549 | unmap_extent_buffer(eb, map_token, KM_USER0); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 550 | return 0; |
| 551 | } |
| 552 | } |
| 553 | *slot = low; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 554 | if (map_token) |
| 555 | unmap_extent_buffer(eb, map_token, KM_USER0); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 556 | return 1; |
| 557 | } |
| 558 | |
Chris Mason | 97571fd | 2007-02-24 13:39:08 -0500 | [diff] [blame] | 559 | /* |
| 560 | * simple bin_search frontend that does the right thing for |
| 561 | * leaves vs nodes |
| 562 | */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 563 | static int bin_search(struct extent_buffer *eb, struct btrfs_key *key, |
| 564 | int level, int *slot) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 565 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 566 | if (level == 0) { |
| 567 | return generic_bin_search(eb, |
| 568 | offsetof(struct btrfs_leaf, items), |
Chris Mason | 0783fcf | 2007-03-12 20:12:07 -0400 | [diff] [blame] | 569 | sizeof(struct btrfs_item), |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 570 | key, btrfs_header_nritems(eb), |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 571 | slot); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 572 | } else { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 573 | return generic_bin_search(eb, |
| 574 | offsetof(struct btrfs_node, ptrs), |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 575 | sizeof(struct btrfs_key_ptr), |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 576 | key, btrfs_header_nritems(eb), |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 577 | slot); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 578 | } |
| 579 | return -1; |
| 580 | } |
| 581 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 582 | static struct extent_buffer *read_node_slot(struct btrfs_root *root, |
| 583 | struct extent_buffer *parent, int slot) |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 584 | { |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 585 | if (slot < 0) |
| 586 | return NULL; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 587 | if (slot >= btrfs_header_nritems(parent)) |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 588 | return NULL; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 589 | return read_tree_block(root, btrfs_node_blockptr(parent, slot), |
| 590 | btrfs_level_size(root, btrfs_header_level(parent) - 1)); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 591 | } |
| 592 | |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 593 | static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root |
| 594 | *root, struct btrfs_path *path, int level) |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 595 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 596 | struct extent_buffer *right = NULL; |
| 597 | struct extent_buffer *mid; |
| 598 | struct extent_buffer *left = NULL; |
| 599 | struct extent_buffer *parent = NULL; |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 600 | int ret = 0; |
| 601 | int wret; |
| 602 | int pslot; |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 603 | int orig_slot = path->slots[level]; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 604 | int err_on_enospc = 0; |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 605 | u64 orig_ptr; |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 606 | |
| 607 | if (level == 0) |
| 608 | return 0; |
| 609 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 610 | mid = path->nodes[level]; |
Chris Mason | 1d4f8a0 | 2007-03-13 09:28:32 -0400 | [diff] [blame] | 611 | orig_ptr = btrfs_node_blockptr(mid, orig_slot); |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 612 | |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 613 | if (level < BTRFS_MAX_LEVEL - 1) |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 614 | parent = path->nodes[level + 1]; |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 615 | pslot = path->slots[level + 1]; |
| 616 | |
Chris Mason | 4068947 | 2007-03-17 14:29:23 -0400 | [diff] [blame] | 617 | /* |
| 618 | * deal with the case where there is only one pointer in the root |
| 619 | * by promoting the node below to a root |
| 620 | */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 621 | if (!parent) { |
| 622 | struct extent_buffer *child; |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 623 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 624 | if (btrfs_header_nritems(mid) != 1) |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 625 | return 0; |
| 626 | |
| 627 | /* promote the child to a root */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 628 | child = read_node_slot(root, mid, 0); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 629 | BUG_ON(!child); |
| 630 | root->node = child; |
| 631 | path->nodes[level] = NULL; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 632 | clean_tree_block(trans, root, mid); |
| 633 | wait_on_tree_block_writeback(root, mid); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 634 | /* once for the path */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 635 | free_extent_buffer(mid); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 636 | ret = btrfs_free_extent(trans, root, mid->start, mid->len, 1); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 637 | /* once for the root ptr */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 638 | free_extent_buffer(mid); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 639 | return ret; |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 640 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 641 | if (btrfs_header_nritems(mid) > |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 642 | BTRFS_NODEPTRS_PER_BLOCK(root) / 4) |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 643 | return 0; |
| 644 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 645 | if (btrfs_header_nritems(mid) < 2) |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 646 | err_on_enospc = 1; |
| 647 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 648 | left = read_node_slot(root, parent, pslot - 1); |
| 649 | if (left) { |
| 650 | wret = btrfs_cow_block(trans, root, left, |
| 651 | parent, pslot - 1, &left); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 652 | if (wret) { |
| 653 | ret = wret; |
| 654 | goto enospc; |
| 655 | } |
Chris Mason | 2cc58cf | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 656 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 657 | right = read_node_slot(root, parent, pslot + 1); |
| 658 | if (right) { |
| 659 | wret = btrfs_cow_block(trans, root, right, |
| 660 | parent, pslot + 1, &right); |
Chris Mason | 2cc58cf | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 661 | if (wret) { |
| 662 | ret = wret; |
| 663 | goto enospc; |
| 664 | } |
| 665 | } |
| 666 | |
| 667 | /* first, try to make some room in the middle buffer */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 668 | if (left) { |
| 669 | orig_slot += btrfs_header_nritems(left); |
| 670 | wret = push_node_left(trans, root, left, mid); |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 671 | if (wret < 0) |
| 672 | ret = wret; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 673 | if (btrfs_header_nritems(mid) < 2) |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 674 | err_on_enospc = 1; |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 675 | } |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 676 | |
| 677 | /* |
| 678 | * then try to empty the right most buffer into the middle |
| 679 | */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 680 | if (right) { |
| 681 | wret = push_node_left(trans, root, mid, right); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 682 | if (wret < 0 && wret != -ENOSPC) |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 683 | ret = wret; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 684 | if (btrfs_header_nritems(right) == 0) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 685 | u64 bytenr = right->start; |
| 686 | u32 blocksize = right->len; |
| 687 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 688 | clean_tree_block(trans, root, right); |
| 689 | wait_on_tree_block_writeback(root, right); |
| 690 | free_extent_buffer(right); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 691 | right = NULL; |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 692 | wret = del_ptr(trans, root, path, level + 1, pslot + |
| 693 | 1); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 694 | if (wret) |
| 695 | ret = wret; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 696 | wret = btrfs_free_extent(trans, root, bytenr, |
| 697 | blocksize, 1); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 698 | if (wret) |
| 699 | ret = wret; |
| 700 | } else { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 701 | struct btrfs_disk_key right_key; |
| 702 | btrfs_node_key(right, &right_key, 0); |
| 703 | btrfs_set_node_key(parent, &right_key, pslot + 1); |
| 704 | btrfs_mark_buffer_dirty(parent); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 705 | } |
| 706 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 707 | if (btrfs_header_nritems(mid) == 1) { |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 708 | /* |
| 709 | * we're not allowed to leave a node with one item in the |
| 710 | * tree during a delete. A deletion from lower in the tree |
| 711 | * could try to delete the only pointer in this node. |
| 712 | * So, pull some keys from the left. |
| 713 | * There has to be a left pointer at this point because |
| 714 | * otherwise we would have pulled some pointers from the |
| 715 | * right |
| 716 | */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 717 | BUG_ON(!left); |
| 718 | wret = balance_node_right(trans, root, mid, left); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 719 | if (wret < 0) { |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 720 | ret = wret; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 721 | goto enospc; |
| 722 | } |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 723 | BUG_ON(wret == 1); |
| 724 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 725 | if (btrfs_header_nritems(mid) == 0) { |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 726 | /* we've managed to empty the middle node, drop it */ |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 727 | u64 bytenr = mid->start; |
| 728 | u32 blocksize = mid->len; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 729 | clean_tree_block(trans, root, mid); |
| 730 | wait_on_tree_block_writeback(root, mid); |
| 731 | free_extent_buffer(mid); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 732 | mid = NULL; |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 733 | wret = del_ptr(trans, root, path, level + 1, pslot); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 734 | if (wret) |
| 735 | ret = wret; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 736 | wret = btrfs_free_extent(trans, root, bytenr, blocksize, 1); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 737 | if (wret) |
| 738 | ret = wret; |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 739 | } else { |
| 740 | /* update the parent key to reflect our changes */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 741 | struct btrfs_disk_key mid_key; |
| 742 | btrfs_node_key(mid, &mid_key, 0); |
| 743 | btrfs_set_node_key(parent, &mid_key, pslot); |
| 744 | btrfs_mark_buffer_dirty(parent); |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 745 | } |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 746 | |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 747 | /* update the path */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 748 | if (left) { |
| 749 | if (btrfs_header_nritems(left) > orig_slot) { |
| 750 | extent_buffer_get(left); |
| 751 | path->nodes[level] = left; |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 752 | path->slots[level + 1] -= 1; |
| 753 | path->slots[level] = orig_slot; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 754 | if (mid) |
| 755 | free_extent_buffer(mid); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 756 | } else { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 757 | orig_slot -= btrfs_header_nritems(left); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 758 | path->slots[level] = orig_slot; |
| 759 | } |
| 760 | } |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 761 | /* double check we haven't messed things up */ |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 762 | check_block(root, path, level); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 763 | if (orig_ptr != |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 764 | btrfs_node_blockptr(path->nodes[level], path->slots[level])) |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 765 | BUG(); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 766 | enospc: |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 767 | if (right) |
| 768 | free_extent_buffer(right); |
| 769 | if (left) |
| 770 | free_extent_buffer(left); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 771 | return ret; |
| 772 | } |
| 773 | |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 774 | /* returns zero if the push worked, non-zero otherwise */ |
| 775 | static int push_nodes_for_insert(struct btrfs_trans_handle *trans, |
| 776 | struct btrfs_root *root, |
| 777 | struct btrfs_path *path, int level) |
| 778 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 779 | struct extent_buffer *right = NULL; |
| 780 | struct extent_buffer *mid; |
| 781 | struct extent_buffer *left = NULL; |
| 782 | struct extent_buffer *parent = NULL; |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 783 | int ret = 0; |
| 784 | int wret; |
| 785 | int pslot; |
| 786 | int orig_slot = path->slots[level]; |
| 787 | u64 orig_ptr; |
| 788 | |
| 789 | if (level == 0) |
| 790 | return 1; |
| 791 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 792 | mid = path->nodes[level]; |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 793 | orig_ptr = btrfs_node_blockptr(mid, orig_slot); |
| 794 | |
| 795 | if (level < BTRFS_MAX_LEVEL - 1) |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 796 | parent = path->nodes[level + 1]; |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 797 | pslot = path->slots[level + 1]; |
| 798 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 799 | if (!parent) |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 800 | return 1; |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 801 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 802 | left = read_node_slot(root, parent, pslot - 1); |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 803 | |
| 804 | /* first, try to make some room in the middle buffer */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 805 | if (left) { |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 806 | u32 left_nr; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 807 | left_nr = btrfs_header_nritems(left); |
Chris Mason | 33ade1f | 2007-04-20 13:48:57 -0400 | [diff] [blame] | 808 | if (left_nr >= BTRFS_NODEPTRS_PER_BLOCK(root) - 1) { |
| 809 | wret = 1; |
| 810 | } else { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 811 | ret = btrfs_cow_block(trans, root, left, parent, |
| 812 | pslot - 1, &left); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 813 | if (ret) |
| 814 | wret = 1; |
| 815 | else { |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 816 | wret = push_node_left(trans, root, |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 817 | left, mid); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 818 | } |
Chris Mason | 33ade1f | 2007-04-20 13:48:57 -0400 | [diff] [blame] | 819 | } |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 820 | if (wret < 0) |
| 821 | ret = wret; |
| 822 | if (wret == 0) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 823 | struct btrfs_disk_key disk_key; |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 824 | orig_slot += left_nr; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 825 | btrfs_node_key(mid, &disk_key, 0); |
| 826 | btrfs_set_node_key(parent, &disk_key, pslot); |
| 827 | btrfs_mark_buffer_dirty(parent); |
| 828 | if (btrfs_header_nritems(left) > orig_slot) { |
| 829 | path->nodes[level] = left; |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 830 | path->slots[level + 1] -= 1; |
| 831 | path->slots[level] = orig_slot; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 832 | free_extent_buffer(mid); |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 833 | } else { |
| 834 | orig_slot -= |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 835 | btrfs_header_nritems(left); |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 836 | path->slots[level] = orig_slot; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 837 | free_extent_buffer(left); |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 838 | } |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 839 | return 0; |
| 840 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 841 | free_extent_buffer(left); |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 842 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 843 | right= read_node_slot(root, parent, pslot + 1); |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 844 | |
| 845 | /* |
| 846 | * then try to empty the right most buffer into the middle |
| 847 | */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 848 | if (right) { |
Chris Mason | 33ade1f | 2007-04-20 13:48:57 -0400 | [diff] [blame] | 849 | u32 right_nr; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 850 | right_nr = btrfs_header_nritems(right); |
Chris Mason | 33ade1f | 2007-04-20 13:48:57 -0400 | [diff] [blame] | 851 | if (right_nr >= BTRFS_NODEPTRS_PER_BLOCK(root) - 1) { |
| 852 | wret = 1; |
| 853 | } else { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 854 | ret = btrfs_cow_block(trans, root, right, |
| 855 | parent, pslot + 1, |
| 856 | &right); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 857 | if (ret) |
| 858 | wret = 1; |
| 859 | else { |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 860 | wret = balance_node_right(trans, root, |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 861 | right, mid); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 862 | } |
Chris Mason | 33ade1f | 2007-04-20 13:48:57 -0400 | [diff] [blame] | 863 | } |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 864 | if (wret < 0) |
| 865 | ret = wret; |
| 866 | if (wret == 0) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 867 | struct btrfs_disk_key disk_key; |
| 868 | |
| 869 | btrfs_node_key(right, &disk_key, 0); |
| 870 | btrfs_set_node_key(parent, &disk_key, pslot + 1); |
| 871 | btrfs_mark_buffer_dirty(parent); |
| 872 | |
| 873 | if (btrfs_header_nritems(mid) <= orig_slot) { |
| 874 | path->nodes[level] = right; |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 875 | path->slots[level + 1] += 1; |
| 876 | path->slots[level] = orig_slot - |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 877 | btrfs_header_nritems(mid); |
| 878 | free_extent_buffer(mid); |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 879 | } else { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 880 | free_extent_buffer(right); |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 881 | } |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 882 | return 0; |
| 883 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 884 | free_extent_buffer(right); |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 885 | } |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 886 | return 1; |
| 887 | } |
| 888 | |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 889 | /* |
Chris Mason | 3c69fae | 2007-08-07 15:52:22 -0400 | [diff] [blame] | 890 | * readahead one full node of leaves |
| 891 | */ |
| 892 | 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] | 893 | int level, int slot) |
Chris Mason | 3c69fae | 2007-08-07 15:52:22 -0400 | [diff] [blame] | 894 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 895 | struct extent_buffer *node; |
Chris Mason | 3c69fae | 2007-08-07 15:52:22 -0400 | [diff] [blame] | 896 | u32 nritems; |
Chris Mason | 3c69fae | 2007-08-07 15:52:22 -0400 | [diff] [blame] | 897 | u64 search; |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame^] | 898 | u64 lowest_read; |
| 899 | u64 highest_read; |
| 900 | u64 nread = 0; |
Chris Mason | 3c69fae | 2007-08-07 15:52:22 -0400 | [diff] [blame] | 901 | int direction = path->reada; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 902 | struct extent_buffer *eb; |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame^] | 903 | u32 nr; |
| 904 | u32 blocksize; |
| 905 | u32 nscan = 0; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 906 | |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 907 | if (level == 0) |
Chris Mason | 3c69fae | 2007-08-07 15:52:22 -0400 | [diff] [blame] | 908 | return; |
| 909 | |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 910 | if (!path->nodes[level]) |
| 911 | return; |
| 912 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 913 | node = path->nodes[level]; |
Chris Mason | 3c69fae | 2007-08-07 15:52:22 -0400 | [diff] [blame] | 914 | search = btrfs_node_blockptr(node, slot); |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame^] | 915 | blocksize = btrfs_level_size(root, level - 1); |
| 916 | eb = btrfs_find_tree_block(root, search, blocksize); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 917 | if (eb) { |
| 918 | free_extent_buffer(eb); |
Chris Mason | 3c69fae | 2007-08-07 15:52:22 -0400 | [diff] [blame] | 919 | return; |
| 920 | } |
| 921 | |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame^] | 922 | highest_read = search; |
| 923 | lowest_read = search; |
| 924 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 925 | nritems = btrfs_header_nritems(node); |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame^] | 926 | nr = slot; |
Chris Mason | 3c69fae | 2007-08-07 15:52:22 -0400 | [diff] [blame] | 927 | while(1) { |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame^] | 928 | if (direction < 0) { |
| 929 | if (nr == 0) |
| 930 | break; |
| 931 | nr--; |
| 932 | } else if (direction > 0) { |
| 933 | nr++; |
| 934 | if (nr >= nritems) |
| 935 | break; |
Chris Mason | 3c69fae | 2007-08-07 15:52:22 -0400 | [diff] [blame] | 936 | } |
Chris Mason | 6b80053 | 2007-10-15 16:17:34 -0400 | [diff] [blame^] | 937 | search = btrfs_node_blockptr(node, nr); |
| 938 | if ((search >= lowest_read && search <= highest_read) || |
| 939 | (search < lowest_read && lowest_read - search <= 32768) || |
| 940 | (search > highest_read && search - highest_read <= 32768)) { |
| 941 | readahead_tree_block(root, search, blocksize); |
| 942 | nread += blocksize; |
| 943 | } |
| 944 | nscan++; |
| 945 | if (path->reada < 2 && (nread > (256 * 1024) || nscan > 32)) |
| 946 | break; |
| 947 | if(nread > (1024 * 1024) || nscan > 128) |
| 948 | break; |
| 949 | |
| 950 | if (search < lowest_read) |
| 951 | lowest_read = search; |
| 952 | if (search > highest_read) |
| 953 | highest_read = search; |
Chris Mason | 3c69fae | 2007-08-07 15:52:22 -0400 | [diff] [blame] | 954 | } |
| 955 | } |
| 956 | /* |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 957 | * look for key in the tree. path is filled in with nodes along the way |
| 958 | * if key is found, we return zero and you can find the item in the leaf |
| 959 | * level of the path (level 0) |
| 960 | * |
| 961 | * 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] | 962 | * be inserted, and 1 is returned. If there are other errors during the |
| 963 | * search a negative error number is returned. |
Chris Mason | 97571fd | 2007-02-24 13:39:08 -0500 | [diff] [blame] | 964 | * |
| 965 | * if ins_len > 0, nodes and leaves will be split as we walk down the |
| 966 | * tree. if ins_len < 0, nodes will be merged as we walk down the tree (if |
| 967 | * possible) |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 968 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 969 | int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root |
| 970 | *root, struct btrfs_key *key, struct btrfs_path *p, int |
| 971 | ins_len, int cow) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 972 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 973 | struct extent_buffer *b; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 974 | u64 bytenr; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 975 | int slot; |
| 976 | int ret; |
| 977 | int level; |
Chris Mason | 3c69fae | 2007-08-07 15:52:22 -0400 | [diff] [blame] | 978 | int should_reada = p->reada; |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 979 | u8 lowest_level = 0; |
| 980 | |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 981 | lowest_level = p->lowest_level; |
| 982 | WARN_ON(lowest_level && ins_len); |
Chris Mason | 22b0ebd | 2007-03-30 08:47:31 -0400 | [diff] [blame] | 983 | WARN_ON(p->nodes[0] != NULL); |
| 984 | WARN_ON(!mutex_is_locked(&root->fs_info->fs_mutex)); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 985 | again: |
| 986 | b = root->node; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 987 | extent_buffer_get(b); |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 988 | while (b) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 989 | level = btrfs_header_level(b); |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 990 | if (cow) { |
| 991 | int wret; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 992 | wret = btrfs_cow_block(trans, root, b, |
| 993 | p->nodes[level + 1], |
| 994 | p->slots[level + 1], |
Yan | 252c38f | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 995 | &b); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 996 | if (wret) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 997 | free_extent_buffer(b); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 998 | return wret; |
| 999 | } |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 1000 | } |
| 1001 | BUG_ON(!cow && ins_len); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1002 | if (level != btrfs_header_level(b)) |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1003 | WARN_ON(1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1004 | level = btrfs_header_level(b); |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 1005 | p->nodes[level] = b; |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 1006 | ret = check_block(root, p, level); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1007 | if (ret) |
| 1008 | return -1; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1009 | ret = bin_search(b, key, level, &slot); |
| 1010 | if (level != 0) { |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1011 | if (ret && slot > 0) |
| 1012 | slot -= 1; |
| 1013 | p->slots[level] = slot; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1014 | if (ins_len > 0 && btrfs_header_nritems(b) >= |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1015 | BTRFS_NODEPTRS_PER_BLOCK(root) - 1) { |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 1016 | int sret = split_node(trans, root, p, level); |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 1017 | BUG_ON(sret > 0); |
| 1018 | if (sret) |
| 1019 | return sret; |
| 1020 | b = p->nodes[level]; |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 1021 | slot = p->slots[level]; |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 1022 | } else if (ins_len < 0) { |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 1023 | int sret = balance_level(trans, root, p, |
| 1024 | level); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 1025 | if (sret) |
| 1026 | return sret; |
| 1027 | b = p->nodes[level]; |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 1028 | if (!b) { |
| 1029 | btrfs_release_path(NULL, p); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 1030 | goto again; |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 1031 | } |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 1032 | slot = p->slots[level]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1033 | BUG_ON(btrfs_header_nritems(b) == 1); |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 1034 | } |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 1035 | /* this is only true while dropping a snapshot */ |
| 1036 | if (level == lowest_level) |
| 1037 | break; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1038 | bytenr = btrfs_node_blockptr(b, slot); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 1039 | if (should_reada) |
| 1040 | reada_for_search(root, p, level, slot); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1041 | b = read_tree_block(root, bytenr, |
| 1042 | btrfs_level_size(root, level - 1)); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1043 | } else { |
| 1044 | p->slots[level] = slot; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1045 | if (ins_len > 0 && btrfs_leaf_free_space(root, b) < |
Chris Mason | 0783fcf | 2007-03-12 20:12:07 -0400 | [diff] [blame] | 1046 | sizeof(struct btrfs_item) + ins_len) { |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1047 | int sret = split_leaf(trans, root, key, |
| 1048 | p, ins_len); |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 1049 | BUG_ON(sret > 0); |
| 1050 | if (sret) |
| 1051 | return sret; |
| 1052 | } |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1053 | return ret; |
| 1054 | } |
| 1055 | } |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1056 | return 1; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1057 | } |
| 1058 | |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1059 | /* |
| 1060 | * adjust the pointers going up the tree, starting at level |
| 1061 | * making sure the right key of each node is points to 'key'. |
| 1062 | * This is used after shifting pointers to the left, so it stops |
| 1063 | * fixing up pointers when a given leaf/node is not in slot 0 of the |
| 1064 | * higher levels |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1065 | * |
| 1066 | * If this fails to write a tree block, it returns -1, but continues |
| 1067 | * fixing up the blocks in ram so the tree is consistent. |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1068 | */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1069 | static int fixup_low_keys(struct btrfs_trans_handle *trans, |
| 1070 | struct btrfs_root *root, struct btrfs_path *path, |
| 1071 | struct btrfs_disk_key *key, int level) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1072 | { |
| 1073 | int i; |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1074 | int ret = 0; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1075 | struct extent_buffer *t; |
| 1076 | |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 1077 | for (i = level; i < BTRFS_MAX_LEVEL; i++) { |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1078 | int tslot = path->slots[i]; |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 1079 | if (!path->nodes[i]) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1080 | break; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1081 | t = path->nodes[i]; |
| 1082 | btrfs_set_node_key(t, key, tslot); |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 1083 | btrfs_mark_buffer_dirty(path->nodes[i]); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1084 | if (tslot != 0) |
| 1085 | break; |
| 1086 | } |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1087 | return ret; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1088 | } |
| 1089 | |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1090 | /* |
| 1091 | * 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] | 1092 | * tree. |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1093 | * |
| 1094 | * returns 0 if some ptrs were pushed left, < 0 if there was some horrible |
| 1095 | * 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] | 1096 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 1097 | 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] | 1098 | *root, struct extent_buffer *dst, |
| 1099 | struct extent_buffer *src) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1100 | { |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1101 | int push_items = 0; |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 1102 | int src_nritems; |
| 1103 | int dst_nritems; |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1104 | int ret = 0; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1105 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1106 | src_nritems = btrfs_header_nritems(src); |
| 1107 | dst_nritems = btrfs_header_nritems(dst); |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 1108 | push_items = BTRFS_NODEPTRS_PER_BLOCK(root) - dst_nritems; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1109 | |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 1110 | if (push_items <= 0) { |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1111 | return 1; |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 1112 | } |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1113 | |
| 1114 | if (src_nritems < push_items) |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 1115 | push_items = src_nritems; |
| 1116 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1117 | copy_extent_buffer(dst, src, |
| 1118 | btrfs_node_key_ptr_offset(dst_nritems), |
| 1119 | btrfs_node_key_ptr_offset(0), |
| 1120 | push_items * sizeof(struct btrfs_key_ptr)); |
| 1121 | |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 1122 | if (push_items < src_nritems) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1123 | memmove_extent_buffer(src, btrfs_node_key_ptr_offset(0), |
| 1124 | btrfs_node_key_ptr_offset(push_items), |
| 1125 | (src_nritems - push_items) * |
| 1126 | sizeof(struct btrfs_key_ptr)); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 1127 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1128 | btrfs_set_header_nritems(src, src_nritems - push_items); |
| 1129 | btrfs_set_header_nritems(dst, dst_nritems + push_items); |
| 1130 | btrfs_mark_buffer_dirty(src); |
| 1131 | btrfs_mark_buffer_dirty(dst); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 1132 | return ret; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1133 | } |
| 1134 | |
Chris Mason | 97571fd | 2007-02-24 13:39:08 -0500 | [diff] [blame] | 1135 | /* |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 1136 | * try to push data from one node into the next node right in the |
| 1137 | * tree. |
| 1138 | * |
| 1139 | * returns 0 if some ptrs were pushed, < 0 if there was some horrible |
| 1140 | * error, and > 0 if there was no room in the right hand block. |
| 1141 | * |
| 1142 | * this will only push up to 1/2 the contents of the left node over |
| 1143 | */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1144 | static int balance_node_right(struct btrfs_trans_handle *trans, |
| 1145 | struct btrfs_root *root, |
| 1146 | struct extent_buffer *dst, |
| 1147 | struct extent_buffer *src) |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 1148 | { |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 1149 | int push_items = 0; |
| 1150 | int max_push; |
| 1151 | int src_nritems; |
| 1152 | int dst_nritems; |
| 1153 | int ret = 0; |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 1154 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1155 | src_nritems = btrfs_header_nritems(src); |
| 1156 | dst_nritems = btrfs_header_nritems(dst); |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 1157 | push_items = BTRFS_NODEPTRS_PER_BLOCK(root) - dst_nritems; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1158 | if (push_items <= 0) |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 1159 | return 1; |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 1160 | |
| 1161 | max_push = src_nritems / 2 + 1; |
| 1162 | /* don't try to empty the node */ |
Yan | 252c38f | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1163 | if (max_push >= src_nritems) |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 1164 | return 1; |
Yan | 252c38f | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1165 | |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 1166 | if (max_push < push_items) |
| 1167 | push_items = max_push; |
| 1168 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1169 | memmove_extent_buffer(dst, btrfs_node_key_ptr_offset(push_items), |
| 1170 | btrfs_node_key_ptr_offset(0), |
| 1171 | (dst_nritems) * |
| 1172 | sizeof(struct btrfs_key_ptr)); |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 1173 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1174 | copy_extent_buffer(dst, src, |
| 1175 | btrfs_node_key_ptr_offset(0), |
| 1176 | btrfs_node_key_ptr_offset(src_nritems - push_items), |
| 1177 | push_items * sizeof(struct btrfs_key_ptr)); |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 1178 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1179 | btrfs_set_header_nritems(src, src_nritems - push_items); |
| 1180 | btrfs_set_header_nritems(dst, dst_nritems + push_items); |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 1181 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1182 | btrfs_mark_buffer_dirty(src); |
| 1183 | btrfs_mark_buffer_dirty(dst); |
Chris Mason | 79f95c8 | 2007-03-01 15:16:26 -0500 | [diff] [blame] | 1184 | return ret; |
| 1185 | } |
| 1186 | |
| 1187 | /* |
Chris Mason | 97571fd | 2007-02-24 13:39:08 -0500 | [diff] [blame] | 1188 | * helper function to insert a new root level in the tree. |
| 1189 | * A new node is allocated, and a single item is inserted to |
| 1190 | * point to the existing root |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1191 | * |
| 1192 | * returns zero on success or < 0 on failure. |
Chris Mason | 97571fd | 2007-02-24 13:39:08 -0500 | [diff] [blame] | 1193 | */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1194 | static int insert_new_root(struct btrfs_trans_handle *trans, |
| 1195 | struct btrfs_root *root, |
| 1196 | struct btrfs_path *path, int level) |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 1197 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1198 | struct extent_buffer *lower; |
| 1199 | struct extent_buffer *c; |
| 1200 | struct btrfs_disk_key lower_key; |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 1201 | |
| 1202 | BUG_ON(path->nodes[level]); |
| 1203 | BUG_ON(path->nodes[level-1] != root->node); |
| 1204 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1205 | c = btrfs_alloc_free_block(trans, root, root->nodesize, |
| 1206 | root->node->start, 0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1207 | if (IS_ERR(c)) |
| 1208 | return PTR_ERR(c); |
| 1209 | memset_extent_buffer(c, 0, 0, root->nodesize); |
| 1210 | btrfs_set_header_nritems(c, 1); |
| 1211 | btrfs_set_header_level(c, level); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1212 | btrfs_set_header_bytenr(c, c->start); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1213 | btrfs_set_header_generation(c, trans->transid); |
| 1214 | btrfs_set_header_owner(c, root->root_key.objectid); |
| 1215 | lower = path->nodes[level-1]; |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 1216 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1217 | write_extent_buffer(c, root->fs_info->fsid, |
| 1218 | (unsigned long)btrfs_header_fsid(c), |
| 1219 | BTRFS_FSID_SIZE); |
| 1220 | if (level == 1) |
| 1221 | btrfs_item_key(lower, &lower_key, 0); |
| 1222 | else |
| 1223 | btrfs_node_key(lower, &lower_key, 0); |
| 1224 | btrfs_set_node_key(c, &lower_key, 0); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1225 | btrfs_set_node_blockptr(c, 0, lower->start); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1226 | |
| 1227 | btrfs_mark_buffer_dirty(c); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 1228 | |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 1229 | /* the super has an extra ref to root->node */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1230 | free_extent_buffer(root->node); |
| 1231 | root->node = c; |
| 1232 | extent_buffer_get(c); |
| 1233 | path->nodes[level] = c; |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 1234 | path->slots[level] = 0; |
| 1235 | return 0; |
| 1236 | } |
| 1237 | |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1238 | /* |
| 1239 | * worker function to insert a single pointer in a node. |
| 1240 | * the node should have enough room for the pointer already |
Chris Mason | 97571fd | 2007-02-24 13:39:08 -0500 | [diff] [blame] | 1241 | * |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1242 | * slot and level indicate where you want the key to go, and |
| 1243 | * blocknr is the block the key points to. |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1244 | * |
| 1245 | * returns zero on success and < 0 on any error |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1246 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 1247 | static int insert_ptr(struct btrfs_trans_handle *trans, struct btrfs_root |
| 1248 | *root, struct btrfs_path *path, struct btrfs_disk_key |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1249 | *key, u64 bytenr, int slot, int level) |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1250 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1251 | struct extent_buffer *lower; |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1252 | int nritems; |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 1253 | |
| 1254 | BUG_ON(!path->nodes[level]); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1255 | lower = path->nodes[level]; |
| 1256 | nritems = btrfs_header_nritems(lower); |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1257 | if (slot > nritems) |
| 1258 | BUG(); |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 1259 | if (nritems == BTRFS_NODEPTRS_PER_BLOCK(root)) |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1260 | BUG(); |
| 1261 | if (slot != nritems) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1262 | memmove_extent_buffer(lower, |
| 1263 | btrfs_node_key_ptr_offset(slot + 1), |
| 1264 | btrfs_node_key_ptr_offset(slot), |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 1265 | (nritems - slot) * sizeof(struct btrfs_key_ptr)); |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1266 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1267 | btrfs_set_node_key(lower, key, slot); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1268 | btrfs_set_node_blockptr(lower, slot, bytenr); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1269 | btrfs_set_header_nritems(lower, nritems + 1); |
| 1270 | btrfs_mark_buffer_dirty(lower); |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1271 | return 0; |
| 1272 | } |
| 1273 | |
Chris Mason | 97571fd | 2007-02-24 13:39:08 -0500 | [diff] [blame] | 1274 | /* |
| 1275 | * split the node at the specified level in path in two. |
| 1276 | * The path is corrected to point to the appropriate node after the split |
| 1277 | * |
| 1278 | * Before splitting this tries to make some room in the node by pushing |
| 1279 | * left and right, if either one works, it returns right away. |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1280 | * |
| 1281 | * returns 0 on success and < 0 on failure |
Chris Mason | 97571fd | 2007-02-24 13:39:08 -0500 | [diff] [blame] | 1282 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 1283 | static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root |
| 1284 | *root, struct btrfs_path *path, int level) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1285 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1286 | struct extent_buffer *c; |
| 1287 | struct extent_buffer *split; |
| 1288 | struct btrfs_disk_key disk_key; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1289 | int mid; |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 1290 | int ret; |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1291 | int wret; |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 1292 | u32 c_nritems; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1293 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1294 | c = path->nodes[level]; |
| 1295 | if (c == root->node) { |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 1296 | /* trying to split the root, lets make a new one */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 1297 | ret = insert_new_root(trans, root, path, level + 1); |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 1298 | if (ret) |
| 1299 | return ret; |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 1300 | } else { |
| 1301 | ret = push_nodes_for_insert(trans, root, path, level); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1302 | c = path->nodes[level]; |
| 1303 | if (!ret && btrfs_header_nritems(c) < |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 1304 | BTRFS_NODEPTRS_PER_BLOCK(root) - 1) |
| 1305 | return 0; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1306 | if (ret < 0) |
| 1307 | return ret; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1308 | } |
Chris Mason | e66f709 | 2007-04-20 13:16:02 -0400 | [diff] [blame] | 1309 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1310 | c_nritems = btrfs_header_nritems(c); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1311 | split = btrfs_alloc_free_block(trans, root, root->nodesize, |
| 1312 | c->start, 0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1313 | if (IS_ERR(split)) |
| 1314 | return PTR_ERR(split); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1315 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1316 | btrfs_set_header_flags(split, btrfs_header_flags(c)); |
| 1317 | btrfs_set_header_level(split, btrfs_header_level(c)); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1318 | btrfs_set_header_bytenr(split, split->start); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1319 | btrfs_set_header_generation(split, trans->transid); |
| 1320 | btrfs_set_header_owner(split, root->root_key.objectid); |
| 1321 | write_extent_buffer(split, root->fs_info->fsid, |
| 1322 | (unsigned long)btrfs_header_fsid(split), |
| 1323 | BTRFS_FSID_SIZE); |
| 1324 | |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 1325 | mid = (c_nritems + 1) / 2; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1326 | |
| 1327 | copy_extent_buffer(split, c, |
| 1328 | btrfs_node_key_ptr_offset(0), |
| 1329 | btrfs_node_key_ptr_offset(mid), |
| 1330 | (c_nritems - mid) * sizeof(struct btrfs_key_ptr)); |
| 1331 | btrfs_set_header_nritems(split, c_nritems - mid); |
| 1332 | btrfs_set_header_nritems(c, mid); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1333 | ret = 0; |
| 1334 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1335 | btrfs_mark_buffer_dirty(c); |
| 1336 | btrfs_mark_buffer_dirty(split); |
| 1337 | |
| 1338 | btrfs_node_key(split, &disk_key, 0); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1339 | wret = insert_ptr(trans, root, path, &disk_key, split->start, |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1340 | path->slots[level + 1] + 1, |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 1341 | level + 1); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1342 | if (wret) |
| 1343 | ret = wret; |
| 1344 | |
Chris Mason | 5de08d7 | 2007-02-24 06:24:44 -0500 | [diff] [blame] | 1345 | if (path->slots[level] >= mid) { |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 1346 | path->slots[level] -= mid; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1347 | free_extent_buffer(c); |
| 1348 | path->nodes[level] = split; |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 1349 | path->slots[level + 1] += 1; |
| 1350 | } else { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1351 | free_extent_buffer(split); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1352 | } |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1353 | return ret; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1354 | } |
| 1355 | |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1356 | /* |
| 1357 | * how many bytes are required to store the items in a leaf. start |
| 1358 | * and nr indicate which items in the leaf to check. This totals up the |
| 1359 | * space used both by the item structs and the item data |
| 1360 | */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1361 | 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] | 1362 | { |
| 1363 | int data_len; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1364 | int nritems = btrfs_header_nritems(l); |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1365 | int end = min(nritems, start + nr) - 1; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1366 | |
| 1367 | if (!nr) |
| 1368 | return 0; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1369 | data_len = btrfs_item_end_nr(l, start); |
| 1370 | data_len = data_len - btrfs_item_offset_nr(l, end); |
Chris Mason | 0783fcf | 2007-03-12 20:12:07 -0400 | [diff] [blame] | 1371 | data_len += sizeof(struct btrfs_item) * nr; |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1372 | WARN_ON(data_len < 0); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1373 | return data_len; |
| 1374 | } |
| 1375 | |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1376 | /* |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1377 | * The space between the end of the leaf items and |
| 1378 | * the start of the leaf data. IOW, how much room |
| 1379 | * the leaf has left for both items and data |
| 1380 | */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1381 | 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] | 1382 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1383 | int nritems = btrfs_header_nritems(leaf); |
| 1384 | int ret; |
| 1385 | ret = BTRFS_LEAF_DATA_SIZE(root) - leaf_space_used(leaf, 0, nritems); |
| 1386 | if (ret < 0) { |
| 1387 | printk("leaf free space ret %d, leaf data size %lu, used %d nritems %d\n", |
| 1388 | ret, BTRFS_LEAF_DATA_SIZE(root), |
| 1389 | leaf_space_used(leaf, 0, nritems), nritems); |
| 1390 | } |
| 1391 | return ret; |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1392 | } |
| 1393 | |
| 1394 | /* |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1395 | * push some data in the path leaf to the right, trying to free up at |
| 1396 | * least data_size bytes. returns zero if the push worked, nonzero otherwise |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1397 | * |
| 1398 | * returns 1 if the push failed because the other node didn't have enough |
| 1399 | * 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] | 1400 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 1401 | static int push_leaf_right(struct btrfs_trans_handle *trans, struct btrfs_root |
| 1402 | *root, struct btrfs_path *path, int data_size) |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1403 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1404 | struct extent_buffer *left = path->nodes[0]; |
| 1405 | struct extent_buffer *right; |
| 1406 | struct extent_buffer *upper; |
| 1407 | struct btrfs_disk_key disk_key; |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1408 | int slot; |
| 1409 | int i; |
| 1410 | int free_space; |
| 1411 | int push_space = 0; |
| 1412 | int push_items = 0; |
Chris Mason | 0783fcf | 2007-03-12 20:12:07 -0400 | [diff] [blame] | 1413 | struct btrfs_item *item; |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 1414 | u32 left_nritems; |
| 1415 | u32 right_nritems; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1416 | u32 data_end; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1417 | u32 this_item_size; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1418 | int ret; |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1419 | |
| 1420 | slot = path->slots[1]; |
| 1421 | if (!path->nodes[1]) { |
| 1422 | return 1; |
| 1423 | } |
| 1424 | upper = path->nodes[1]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1425 | if (slot >= btrfs_header_nritems(upper) - 1) |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1426 | return 1; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1427 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1428 | right = read_tree_block(root, btrfs_node_blockptr(upper, slot + 1), |
| 1429 | root->leafsize); |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 1430 | free_space = btrfs_leaf_free_space(root, right); |
Chris Mason | 0783fcf | 2007-03-12 20:12:07 -0400 | [diff] [blame] | 1431 | if (free_space < data_size + sizeof(struct btrfs_item)) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1432 | free_extent_buffer(right); |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 1433 | return 1; |
| 1434 | } |
| 1435 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1436 | /* cow and double check */ |
| 1437 | ret = btrfs_cow_block(trans, root, right, upper, |
| 1438 | slot + 1, &right); |
| 1439 | if (ret) { |
| 1440 | free_extent_buffer(right); |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 1441 | return 1; |
| 1442 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1443 | free_space = btrfs_leaf_free_space(root, right); |
| 1444 | if (free_space < data_size + sizeof(struct btrfs_item)) { |
| 1445 | free_extent_buffer(right); |
| 1446 | return 1; |
| 1447 | } |
| 1448 | |
| 1449 | left_nritems = btrfs_header_nritems(left); |
| 1450 | if (left_nritems == 0) { |
| 1451 | free_extent_buffer(right); |
| 1452 | return 1; |
| 1453 | } |
| 1454 | |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 1455 | for (i = left_nritems - 1; i >= 1; i--) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1456 | item = btrfs_item_nr(left, i); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1457 | |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1458 | if (path->slots[0] == i) |
| 1459 | push_space += data_size + sizeof(*item); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1460 | |
| 1461 | if (!left->map_token) { |
| 1462 | map_extent_buffer(left, (unsigned long)item, |
| 1463 | sizeof(struct btrfs_item), |
| 1464 | &left->map_token, &left->kaddr, |
| 1465 | &left->map_start, &left->map_len, |
| 1466 | KM_USER1); |
| 1467 | } |
| 1468 | |
| 1469 | this_item_size = btrfs_item_size(left, item); |
| 1470 | if (this_item_size + sizeof(*item) + push_space > free_space) |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1471 | break; |
| 1472 | push_items++; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1473 | push_space += this_item_size + sizeof(*item); |
| 1474 | } |
| 1475 | if (left->map_token) { |
| 1476 | unmap_extent_buffer(left, left->map_token, KM_USER1); |
| 1477 | left->map_token = NULL; |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1478 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1479 | |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1480 | if (push_items == 0) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1481 | free_extent_buffer(right); |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1482 | return 1; |
| 1483 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1484 | |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 1485 | if (push_items == left_nritems) |
| 1486 | WARN_ON(1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1487 | |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1488 | /* push left to right */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1489 | right_nritems = btrfs_header_nritems(right); |
| 1490 | push_space = btrfs_item_end_nr(left, left_nritems - push_items); |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 1491 | push_space -= leaf_data_end(root, left); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1492 | |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1493 | /* make room in the right data area */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1494 | data_end = leaf_data_end(root, right); |
| 1495 | memmove_extent_buffer(right, |
| 1496 | btrfs_leaf_data(right) + data_end - push_space, |
| 1497 | btrfs_leaf_data(right) + data_end, |
| 1498 | BTRFS_LEAF_DATA_SIZE(root) - data_end); |
| 1499 | |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1500 | /* copy from the left data area */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1501 | copy_extent_buffer(right, left, btrfs_leaf_data(right) + |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 1502 | BTRFS_LEAF_DATA_SIZE(root) - push_space, |
| 1503 | btrfs_leaf_data(left) + leaf_data_end(root, left), |
| 1504 | push_space); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1505 | |
| 1506 | memmove_extent_buffer(right, btrfs_item_nr_offset(push_items), |
| 1507 | btrfs_item_nr_offset(0), |
| 1508 | right_nritems * sizeof(struct btrfs_item)); |
| 1509 | |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1510 | /* copy the items from left to right */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1511 | copy_extent_buffer(right, left, btrfs_item_nr_offset(0), |
| 1512 | btrfs_item_nr_offset(left_nritems - push_items), |
| 1513 | push_items * sizeof(struct btrfs_item)); |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1514 | |
| 1515 | /* update the item pointers */ |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 1516 | right_nritems += push_items; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1517 | btrfs_set_header_nritems(right, right_nritems); |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 1518 | push_space = BTRFS_LEAF_DATA_SIZE(root); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1519 | |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 1520 | for (i = 0; i < right_nritems; i++) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1521 | item = btrfs_item_nr(right, i); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1522 | if (!right->map_token) { |
| 1523 | map_extent_buffer(right, (unsigned long)item, |
| 1524 | sizeof(struct btrfs_item), |
| 1525 | &right->map_token, &right->kaddr, |
| 1526 | &right->map_start, &right->map_len, |
| 1527 | KM_USER1); |
| 1528 | } |
| 1529 | push_space -= btrfs_item_size(right, item); |
| 1530 | btrfs_set_item_offset(right, item, push_space); |
| 1531 | } |
| 1532 | |
| 1533 | if (right->map_token) { |
| 1534 | unmap_extent_buffer(right, right->map_token, KM_USER1); |
| 1535 | right->map_token = NULL; |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1536 | } |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 1537 | left_nritems -= push_items; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1538 | btrfs_set_header_nritems(left, left_nritems); |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1539 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1540 | btrfs_mark_buffer_dirty(left); |
| 1541 | btrfs_mark_buffer_dirty(right); |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 1542 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1543 | btrfs_item_key(right, &disk_key, 0); |
| 1544 | btrfs_set_node_key(upper, &disk_key, slot + 1); |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 1545 | btrfs_mark_buffer_dirty(upper); |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 1546 | |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1547 | /* then fixup the leaf pointer in the path */ |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 1548 | if (path->slots[0] >= left_nritems) { |
| 1549 | path->slots[0] -= left_nritems; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1550 | free_extent_buffer(path->nodes[0]); |
| 1551 | path->nodes[0] = right; |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1552 | path->slots[1] += 1; |
| 1553 | } else { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1554 | free_extent_buffer(right); |
Chris Mason | 00ec4c5 | 2007-02-24 12:47:20 -0500 | [diff] [blame] | 1555 | } |
| 1556 | return 0; |
| 1557 | } |
| 1558 | /* |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1559 | * push some data in the path leaf to the left, trying to free up at |
| 1560 | * least data_size bytes. returns zero if the push worked, nonzero otherwise |
| 1561 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 1562 | static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root |
| 1563 | *root, struct btrfs_path *path, int data_size) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1564 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1565 | struct btrfs_disk_key disk_key; |
| 1566 | struct extent_buffer *right = path->nodes[0]; |
| 1567 | struct extent_buffer *left; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1568 | int slot; |
| 1569 | int i; |
| 1570 | int free_space; |
| 1571 | int push_space = 0; |
| 1572 | int push_items = 0; |
Chris Mason | 0783fcf | 2007-03-12 20:12:07 -0400 | [diff] [blame] | 1573 | struct btrfs_item *item; |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 1574 | u32 old_left_nritems; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1575 | u32 right_nritems; |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1576 | int ret = 0; |
| 1577 | int wret; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1578 | u32 this_item_size; |
| 1579 | u32 old_left_item_size; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1580 | |
| 1581 | slot = path->slots[1]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1582 | if (slot == 0) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1583 | return 1; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1584 | if (!path->nodes[1]) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1585 | return 1; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1586 | |
| 1587 | left = read_tree_block(root, btrfs_node_blockptr(path->nodes[1], |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1588 | slot - 1), root->leafsize); |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 1589 | free_space = btrfs_leaf_free_space(root, left); |
Chris Mason | 0783fcf | 2007-03-12 20:12:07 -0400 | [diff] [blame] | 1590 | if (free_space < data_size + sizeof(struct btrfs_item)) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1591 | free_extent_buffer(left); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1592 | return 1; |
| 1593 | } |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 1594 | |
| 1595 | /* cow and double check */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1596 | ret = btrfs_cow_block(trans, root, left, |
| 1597 | path->nodes[1], slot - 1, &left); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1598 | if (ret) { |
| 1599 | /* we hit -ENOSPC, but it isn't fatal here */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1600 | free_extent_buffer(left); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1601 | return 1; |
| 1602 | } |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 1603 | free_space = btrfs_leaf_free_space(root, left); |
Chris Mason | 0783fcf | 2007-03-12 20:12:07 -0400 | [diff] [blame] | 1604 | if (free_space < data_size + sizeof(struct btrfs_item)) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1605 | free_extent_buffer(left); |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 1606 | return 1; |
| 1607 | } |
| 1608 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1609 | right_nritems = btrfs_header_nritems(right); |
| 1610 | if (right_nritems == 0) { |
| 1611 | free_extent_buffer(left); |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 1612 | return 1; |
| 1613 | } |
| 1614 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1615 | for (i = 0; i < right_nritems - 1; i++) { |
| 1616 | item = btrfs_item_nr(right, i); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1617 | if (!right->map_token) { |
| 1618 | map_extent_buffer(right, (unsigned long)item, |
| 1619 | sizeof(struct btrfs_item), |
| 1620 | &right->map_token, &right->kaddr, |
| 1621 | &right->map_start, &right->map_len, |
| 1622 | KM_USER1); |
| 1623 | } |
| 1624 | |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1625 | if (path->slots[0] == i) |
| 1626 | push_space += data_size + sizeof(*item); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1627 | |
| 1628 | this_item_size = btrfs_item_size(right, item); |
| 1629 | if (this_item_size + sizeof(*item) + push_space > free_space) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1630 | break; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1631 | |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1632 | push_items++; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1633 | push_space += this_item_size + sizeof(*item); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1634 | } |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1635 | |
| 1636 | if (right->map_token) { |
| 1637 | unmap_extent_buffer(right, right->map_token, KM_USER1); |
| 1638 | right->map_token = NULL; |
| 1639 | } |
| 1640 | |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1641 | if (push_items == 0) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1642 | free_extent_buffer(left); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1643 | return 1; |
| 1644 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1645 | if (push_items == btrfs_header_nritems(right)) |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 1646 | WARN_ON(1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1647 | |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1648 | /* push data from right to left */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1649 | copy_extent_buffer(left, right, |
| 1650 | btrfs_item_nr_offset(btrfs_header_nritems(left)), |
| 1651 | btrfs_item_nr_offset(0), |
| 1652 | push_items * sizeof(struct btrfs_item)); |
| 1653 | |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 1654 | push_space = BTRFS_LEAF_DATA_SIZE(root) - |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1655 | btrfs_item_offset_nr(right, push_items -1); |
| 1656 | |
| 1657 | copy_extent_buffer(left, right, btrfs_leaf_data(left) + |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 1658 | leaf_data_end(root, left) - push_space, |
| 1659 | btrfs_leaf_data(right) + |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1660 | btrfs_item_offset_nr(right, push_items - 1), |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 1661 | push_space); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1662 | old_left_nritems = btrfs_header_nritems(left); |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 1663 | BUG_ON(old_left_nritems < 0); |
| 1664 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1665 | 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] | 1666 | for (i = old_left_nritems; i < old_left_nritems + push_items; i++) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1667 | u32 ioff; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1668 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1669 | item = btrfs_item_nr(left, i); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1670 | if (!left->map_token) { |
| 1671 | map_extent_buffer(left, (unsigned long)item, |
| 1672 | sizeof(struct btrfs_item), |
| 1673 | &left->map_token, &left->kaddr, |
| 1674 | &left->map_start, &left->map_len, |
| 1675 | KM_USER1); |
| 1676 | } |
| 1677 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1678 | ioff = btrfs_item_offset(left, item); |
| 1679 | btrfs_set_item_offset(left, item, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1680 | ioff - (BTRFS_LEAF_DATA_SIZE(root) - old_left_item_size)); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1681 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1682 | btrfs_set_header_nritems(left, old_left_nritems + push_items); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1683 | if (left->map_token) { |
| 1684 | unmap_extent_buffer(left, left->map_token, KM_USER1); |
| 1685 | left->map_token = NULL; |
| 1686 | } |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1687 | |
| 1688 | /* fixup right node */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1689 | push_space = btrfs_item_offset_nr(right, push_items - 1) - |
| 1690 | leaf_data_end(root, right); |
| 1691 | memmove_extent_buffer(right, btrfs_leaf_data(right) + |
| 1692 | BTRFS_LEAF_DATA_SIZE(root) - push_space, |
| 1693 | btrfs_leaf_data(right) + |
| 1694 | leaf_data_end(root, right), push_space); |
| 1695 | |
| 1696 | memmove_extent_buffer(right, btrfs_item_nr_offset(0), |
| 1697 | btrfs_item_nr_offset(push_items), |
| 1698 | (btrfs_header_nritems(right) - push_items) * |
| 1699 | sizeof(struct btrfs_item)); |
| 1700 | |
| 1701 | right_nritems = btrfs_header_nritems(right) - push_items; |
| 1702 | btrfs_set_header_nritems(right, right_nritems); |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 1703 | push_space = BTRFS_LEAF_DATA_SIZE(root); |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 1704 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1705 | for (i = 0; i < right_nritems; i++) { |
| 1706 | item = btrfs_item_nr(right, i); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1707 | |
| 1708 | if (!right->map_token) { |
| 1709 | map_extent_buffer(right, (unsigned long)item, |
| 1710 | sizeof(struct btrfs_item), |
| 1711 | &right->map_token, &right->kaddr, |
| 1712 | &right->map_start, &right->map_len, |
| 1713 | KM_USER1); |
| 1714 | } |
| 1715 | |
| 1716 | push_space = push_space - btrfs_item_size(right, item); |
| 1717 | btrfs_set_item_offset(right, item, push_space); |
| 1718 | } |
| 1719 | if (right->map_token) { |
| 1720 | unmap_extent_buffer(right, right->map_token, KM_USER1); |
| 1721 | right->map_token = NULL; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1722 | } |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 1723 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1724 | btrfs_mark_buffer_dirty(left); |
| 1725 | btrfs_mark_buffer_dirty(right); |
Chris Mason | 098f59c | 2007-05-11 11:33:21 -0400 | [diff] [blame] | 1726 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1727 | btrfs_item_key(right, &disk_key, 0); |
| 1728 | wret = fixup_low_keys(trans, root, path, &disk_key, 1); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1729 | if (wret) |
| 1730 | ret = wret; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1731 | |
| 1732 | /* then fixup the leaf pointer in the path */ |
| 1733 | if (path->slots[0] < push_items) { |
| 1734 | path->slots[0] += old_left_nritems; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1735 | free_extent_buffer(path->nodes[0]); |
| 1736 | path->nodes[0] = left; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1737 | path->slots[1] -= 1; |
| 1738 | } else { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1739 | free_extent_buffer(left); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1740 | path->slots[0] -= push_items; |
| 1741 | } |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 1742 | BUG_ON(path->slots[0] < 0); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1743 | return ret; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1744 | } |
| 1745 | |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1746 | /* |
| 1747 | * split the path's leaf in two, making sure there is at least data_size |
| 1748 | * available for the resulting leaf level of the path. |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1749 | * |
| 1750 | * returns 0 if all went well and < 0 on failure. |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1751 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 1752 | static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1753 | *root, struct btrfs_key *ins_key, |
| 1754 | struct btrfs_path *path, int data_size) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1755 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1756 | struct extent_buffer *l; |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 1757 | u32 nritems; |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 1758 | int mid; |
| 1759 | int slot; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1760 | struct extent_buffer *right; |
Chris Mason | 0783fcf | 2007-03-12 20:12:07 -0400 | [diff] [blame] | 1761 | int space_needed = data_size + sizeof(struct btrfs_item); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1762 | int data_copy_size; |
| 1763 | int rt_data_off; |
| 1764 | int i; |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1765 | int ret = 0; |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1766 | int wret; |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1767 | int double_split = 0; |
| 1768 | struct btrfs_disk_key disk_key; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1769 | |
Chris Mason | 4068947 | 2007-03-17 14:29:23 -0400 | [diff] [blame] | 1770 | /* first try to make some room by pushing left and right */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 1771 | wret = push_leaf_left(trans, root, path, data_size); |
Chris Mason | eaee50e | 2007-03-13 11:17:52 -0400 | [diff] [blame] | 1772 | if (wret < 0) |
| 1773 | return wret; |
| 1774 | if (wret) { |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 1775 | wret = push_leaf_right(trans, root, path, data_size); |
Chris Mason | eaee50e | 2007-03-13 11:17:52 -0400 | [diff] [blame] | 1776 | if (wret < 0) |
| 1777 | return wret; |
| 1778 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1779 | l = path->nodes[0]; |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1780 | |
| 1781 | /* did the pushes work? */ |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 1782 | if (btrfs_leaf_free_space(root, l) >= |
| 1783 | sizeof(struct btrfs_item) + data_size) |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1784 | return 0; |
| 1785 | |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 1786 | if (!path->nodes[1]) { |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 1787 | ret = insert_new_root(trans, root, path, 1); |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 1788 | if (ret) |
| 1789 | return ret; |
| 1790 | } |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 1791 | slot = path->slots[0]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1792 | nritems = btrfs_header_nritems(l); |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 1793 | mid = (nritems + 1)/ 2; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1794 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1795 | right = btrfs_alloc_free_block(trans, root, root->leafsize, |
| 1796 | l->start, 0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1797 | if (IS_ERR(right)) |
| 1798 | return PTR_ERR(right); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1799 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1800 | memset_extent_buffer(right, 0, 0, sizeof(struct btrfs_header)); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1801 | btrfs_set_header_bytenr(right, right->start); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1802 | btrfs_set_header_generation(right, trans->transid); |
| 1803 | btrfs_set_header_owner(right, root->root_key.objectid); |
| 1804 | btrfs_set_header_level(right, 0); |
| 1805 | write_extent_buffer(right, root->fs_info->fsid, |
| 1806 | (unsigned long)btrfs_header_fsid(right), |
| 1807 | BTRFS_FSID_SIZE); |
| 1808 | |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1809 | if (mid <= slot) { |
| 1810 | if (nritems == 1 || |
| 1811 | leaf_space_used(l, mid, nritems - mid) + space_needed > |
| 1812 | BTRFS_LEAF_DATA_SIZE(root)) { |
| 1813 | if (slot >= nritems) { |
| 1814 | btrfs_cpu_key_to_disk(&disk_key, ins_key); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1815 | btrfs_set_header_nritems(right, 0); |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1816 | wret = insert_ptr(trans, root, path, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1817 | &disk_key, right->start, |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1818 | path->slots[1] + 1, 1); |
| 1819 | if (wret) |
| 1820 | ret = wret; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1821 | free_extent_buffer(path->nodes[0]); |
| 1822 | path->nodes[0] = right; |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1823 | path->slots[0] = 0; |
| 1824 | path->slots[1] += 1; |
| 1825 | return ret; |
| 1826 | } |
| 1827 | mid = slot; |
| 1828 | double_split = 1; |
| 1829 | } |
| 1830 | } else { |
| 1831 | if (leaf_space_used(l, 0, mid + 1) + space_needed > |
| 1832 | BTRFS_LEAF_DATA_SIZE(root)) { |
| 1833 | if (slot == 0) { |
| 1834 | btrfs_cpu_key_to_disk(&disk_key, ins_key); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1835 | btrfs_set_header_nritems(right, 0); |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1836 | wret = insert_ptr(trans, root, path, |
| 1837 | &disk_key, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1838 | right->start, |
Chris Mason | 098f59c | 2007-05-11 11:33:21 -0400 | [diff] [blame] | 1839 | path->slots[1], 1); |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1840 | if (wret) |
| 1841 | ret = wret; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1842 | free_extent_buffer(path->nodes[0]); |
| 1843 | path->nodes[0] = right; |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1844 | path->slots[0] = 0; |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 1845 | if (path->slots[1] == 0) { |
| 1846 | wret = fixup_low_keys(trans, root, |
| 1847 | path, &disk_key, 1); |
| 1848 | if (wret) |
| 1849 | ret = wret; |
| 1850 | } |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1851 | return ret; |
| 1852 | } |
| 1853 | mid = slot; |
| 1854 | double_split = 1; |
| 1855 | } |
| 1856 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1857 | nritems = nritems - mid; |
| 1858 | btrfs_set_header_nritems(right, nritems); |
| 1859 | data_copy_size = btrfs_item_end_nr(l, mid) - leaf_data_end(root, l); |
| 1860 | |
| 1861 | copy_extent_buffer(right, l, btrfs_item_nr_offset(0), |
| 1862 | btrfs_item_nr_offset(mid), |
| 1863 | nritems * sizeof(struct btrfs_item)); |
| 1864 | |
| 1865 | copy_extent_buffer(right, l, |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 1866 | btrfs_leaf_data(right) + BTRFS_LEAF_DATA_SIZE(root) - |
| 1867 | data_copy_size, btrfs_leaf_data(l) + |
| 1868 | leaf_data_end(root, l), data_copy_size); |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1869 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1870 | rt_data_off = BTRFS_LEAF_DATA_SIZE(root) - |
| 1871 | btrfs_item_end_nr(l, mid); |
| 1872 | |
| 1873 | for (i = 0; i < nritems; i++) { |
| 1874 | struct btrfs_item *item = btrfs_item_nr(right, i); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1875 | u32 ioff; |
| 1876 | |
| 1877 | if (!right->map_token) { |
| 1878 | map_extent_buffer(right, (unsigned long)item, |
| 1879 | sizeof(struct btrfs_item), |
| 1880 | &right->map_token, &right->kaddr, |
| 1881 | &right->map_start, &right->map_len, |
| 1882 | KM_USER1); |
| 1883 | } |
| 1884 | |
| 1885 | ioff = btrfs_item_offset(right, item); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1886 | btrfs_set_item_offset(right, item, ioff + rt_data_off); |
Chris Mason | 0783fcf | 2007-03-12 20:12:07 -0400 | [diff] [blame] | 1887 | } |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 1888 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1889 | if (right->map_token) { |
| 1890 | unmap_extent_buffer(right, right->map_token, KM_USER1); |
| 1891 | right->map_token = NULL; |
| 1892 | } |
| 1893 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1894 | btrfs_set_header_nritems(l, mid); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1895 | ret = 0; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1896 | btrfs_item_key(right, &disk_key, 0); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1897 | wret = insert_ptr(trans, root, path, &disk_key, right->start, |
| 1898 | path->slots[1] + 1, 1); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 1899 | if (wret) |
| 1900 | ret = wret; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1901 | |
| 1902 | btrfs_mark_buffer_dirty(right); |
| 1903 | btrfs_mark_buffer_dirty(l); |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 1904 | BUG_ON(path->slots[0] != slot); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1905 | |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1906 | if (mid <= slot) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1907 | free_extent_buffer(path->nodes[0]); |
| 1908 | path->nodes[0] = right; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1909 | path->slots[0] -= mid; |
| 1910 | path->slots[1] += 1; |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 1911 | } else |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1912 | free_extent_buffer(right); |
| 1913 | |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 1914 | BUG_ON(path->slots[0] < 0); |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1915 | |
| 1916 | if (!double_split) |
| 1917 | return ret; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1918 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1919 | right = btrfs_alloc_free_block(trans, root, root->leafsize, |
| 1920 | l->start, 0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1921 | if (IS_ERR(right)) |
| 1922 | return PTR_ERR(right); |
| 1923 | |
| 1924 | memset_extent_buffer(right, 0, 0, sizeof(struct btrfs_header)); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1925 | btrfs_set_header_bytenr(right, right->start); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1926 | btrfs_set_header_generation(right, trans->transid); |
| 1927 | btrfs_set_header_owner(right, root->root_key.objectid); |
| 1928 | btrfs_set_header_level(right, 0); |
| 1929 | write_extent_buffer(right, root->fs_info->fsid, |
| 1930 | (unsigned long)btrfs_header_fsid(right), |
| 1931 | BTRFS_FSID_SIZE); |
| 1932 | |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1933 | btrfs_cpu_key_to_disk(&disk_key, ins_key); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1934 | btrfs_set_header_nritems(right, 0); |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1935 | wret = insert_ptr(trans, root, path, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1936 | &disk_key, right->start, |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1937 | path->slots[1], 1); |
| 1938 | if (wret) |
| 1939 | ret = wret; |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 1940 | if (path->slots[1] == 0) { |
| 1941 | wret = fixup_low_keys(trans, root, path, &disk_key, 1); |
| 1942 | if (wret) |
| 1943 | ret = wret; |
| 1944 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1945 | free_extent_buffer(path->nodes[0]); |
| 1946 | path->nodes[0] = right; |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 1947 | path->slots[0] = 0; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 1948 | return ret; |
| 1949 | } |
| 1950 | |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1951 | int btrfs_truncate_item(struct btrfs_trans_handle *trans, |
| 1952 | struct btrfs_root *root, |
| 1953 | struct btrfs_path *path, |
| 1954 | u32 new_size) |
| 1955 | { |
| 1956 | int ret = 0; |
| 1957 | int slot; |
| 1958 | int slot_orig; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1959 | struct extent_buffer *leaf; |
| 1960 | struct btrfs_item *item; |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1961 | u32 nritems; |
| 1962 | unsigned int data_end; |
| 1963 | unsigned int old_data_start; |
| 1964 | unsigned int old_size; |
| 1965 | unsigned int size_diff; |
| 1966 | int i; |
| 1967 | |
| 1968 | slot_orig = path->slots[0]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1969 | leaf = path->nodes[0]; |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1970 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1971 | nritems = btrfs_header_nritems(leaf); |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1972 | data_end = leaf_data_end(root, leaf); |
| 1973 | |
| 1974 | slot = path->slots[0]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1975 | old_data_start = btrfs_item_offset_nr(leaf, slot); |
| 1976 | old_size = btrfs_item_size_nr(leaf, slot); |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 1977 | BUG_ON(old_size <= new_size); |
| 1978 | size_diff = old_size - new_size; |
| 1979 | |
| 1980 | BUG_ON(slot < 0); |
| 1981 | BUG_ON(slot >= nritems); |
| 1982 | |
| 1983 | /* |
| 1984 | * item0..itemN ... dataN.offset..dataN.size .. data0.size |
| 1985 | */ |
| 1986 | /* first correct the data pointers */ |
| 1987 | for (i = slot; i < nritems; i++) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1988 | u32 ioff; |
| 1989 | item = btrfs_item_nr(leaf, i); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1990 | |
| 1991 | if (!leaf->map_token) { |
| 1992 | map_extent_buffer(leaf, (unsigned long)item, |
| 1993 | sizeof(struct btrfs_item), |
| 1994 | &leaf->map_token, &leaf->kaddr, |
| 1995 | &leaf->map_start, &leaf->map_len, |
| 1996 | KM_USER1); |
| 1997 | } |
| 1998 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1999 | ioff = btrfs_item_offset(leaf, item); |
| 2000 | btrfs_set_item_offset(leaf, item, ioff + size_diff); |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 2001 | } |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2002 | |
| 2003 | if (leaf->map_token) { |
| 2004 | unmap_extent_buffer(leaf, leaf->map_token, KM_USER1); |
| 2005 | leaf->map_token = NULL; |
| 2006 | } |
| 2007 | |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 2008 | /* shift the data */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2009 | memmove_extent_buffer(leaf, btrfs_leaf_data(leaf) + |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 2010 | data_end + size_diff, btrfs_leaf_data(leaf) + |
| 2011 | data_end, old_data_start + new_size - data_end); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2012 | |
| 2013 | item = btrfs_item_nr(leaf, slot); |
| 2014 | btrfs_set_item_size(leaf, item, new_size); |
| 2015 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 2016 | |
| 2017 | ret = 0; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2018 | if (btrfs_leaf_free_space(root, leaf) < 0) { |
| 2019 | btrfs_print_leaf(root, leaf); |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 2020 | BUG(); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2021 | } |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 2022 | return ret; |
| 2023 | } |
| 2024 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2025 | int btrfs_extend_item(struct btrfs_trans_handle *trans, |
| 2026 | struct btrfs_root *root, struct btrfs_path *path, |
| 2027 | u32 data_size) |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 2028 | { |
| 2029 | int ret = 0; |
| 2030 | int slot; |
| 2031 | int slot_orig; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2032 | struct extent_buffer *leaf; |
| 2033 | struct btrfs_item *item; |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 2034 | u32 nritems; |
| 2035 | unsigned int data_end; |
| 2036 | unsigned int old_data; |
| 2037 | unsigned int old_size; |
| 2038 | int i; |
| 2039 | |
| 2040 | slot_orig = path->slots[0]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2041 | leaf = path->nodes[0]; |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 2042 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2043 | nritems = btrfs_header_nritems(leaf); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 2044 | data_end = leaf_data_end(root, leaf); |
| 2045 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2046 | if (btrfs_leaf_free_space(root, leaf) < data_size) { |
| 2047 | btrfs_print_leaf(root, leaf); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 2048 | BUG(); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2049 | } |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 2050 | slot = path->slots[0]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2051 | old_data = btrfs_item_end_nr(leaf, slot); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 2052 | |
| 2053 | BUG_ON(slot < 0); |
| 2054 | BUG_ON(slot >= nritems); |
| 2055 | |
| 2056 | /* |
| 2057 | * item0..itemN ... dataN.offset..dataN.size .. data0.size |
| 2058 | */ |
| 2059 | /* first correct the data pointers */ |
| 2060 | for (i = slot; i < nritems; i++) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2061 | u32 ioff; |
| 2062 | item = btrfs_item_nr(leaf, i); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2063 | |
| 2064 | if (!leaf->map_token) { |
| 2065 | map_extent_buffer(leaf, (unsigned long)item, |
| 2066 | sizeof(struct btrfs_item), |
| 2067 | &leaf->map_token, &leaf->kaddr, |
| 2068 | &leaf->map_start, &leaf->map_len, |
| 2069 | KM_USER1); |
| 2070 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2071 | ioff = btrfs_item_offset(leaf, item); |
| 2072 | btrfs_set_item_offset(leaf, item, ioff - data_size); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 2073 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2074 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2075 | if (leaf->map_token) { |
| 2076 | unmap_extent_buffer(leaf, leaf->map_token, KM_USER1); |
| 2077 | leaf->map_token = NULL; |
| 2078 | } |
| 2079 | |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 2080 | /* shift the data */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2081 | memmove_extent_buffer(leaf, btrfs_leaf_data(leaf) + |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 2082 | data_end - data_size, btrfs_leaf_data(leaf) + |
| 2083 | data_end, old_data - data_end); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2084 | |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 2085 | data_end = old_data; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2086 | old_size = btrfs_item_size_nr(leaf, slot); |
| 2087 | item = btrfs_item_nr(leaf, slot); |
| 2088 | btrfs_set_item_size(leaf, item, old_size + data_size); |
| 2089 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 2090 | |
| 2091 | ret = 0; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2092 | if (btrfs_leaf_free_space(root, leaf) < 0) { |
| 2093 | btrfs_print_leaf(root, leaf); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 2094 | BUG(); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2095 | } |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 2096 | return ret; |
| 2097 | } |
| 2098 | |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 2099 | /* |
| 2100 | * Given a key and some data, insert an item into the tree. |
| 2101 | * This does all the path init required, making room in the tree if needed. |
| 2102 | */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2103 | int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, |
| 2104 | struct btrfs_root *root, |
| 2105 | struct btrfs_path *path, |
| 2106 | struct btrfs_key *cpu_key, u32 data_size) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2107 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2108 | struct extent_buffer *leaf; |
| 2109 | struct btrfs_item *item; |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 2110 | int ret = 0; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2111 | int slot; |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 2112 | int slot_orig; |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 2113 | u32 nritems; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2114 | unsigned int data_end; |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 2115 | struct btrfs_disk_key disk_key; |
| 2116 | |
| 2117 | btrfs_cpu_key_to_disk(&disk_key, cpu_key); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2118 | |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 2119 | /* create a root if there isn't one */ |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 2120 | if (!root->node) |
Chris Mason | cfaa729 | 2007-02-21 17:04:57 -0500 | [diff] [blame] | 2121 | BUG(); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2122 | |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 2123 | ret = btrfs_search_slot(trans, root, cpu_key, path, data_size, 1); |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 2124 | if (ret == 0) { |
Chris Mason | f0930a3 | 2007-03-02 09:47:58 -0500 | [diff] [blame] | 2125 | return -EEXIST; |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 2126 | } |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 2127 | if (ret < 0) |
| 2128 | goto out; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2129 | |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 2130 | slot_orig = path->slots[0]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2131 | leaf = path->nodes[0]; |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 2132 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2133 | nritems = btrfs_header_nritems(leaf); |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 2134 | data_end = leaf_data_end(root, leaf); |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 2135 | |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 2136 | if (btrfs_leaf_free_space(root, leaf) < |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 2137 | sizeof(struct btrfs_item) + data_size) { |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2138 | BUG(); |
Chris Mason | d4dbff9 | 2007-04-04 14:08:15 -0400 | [diff] [blame] | 2139 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2140 | |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 2141 | slot = path->slots[0]; |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 2142 | BUG_ON(slot < 0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2143 | |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2144 | if (slot != nritems) { |
| 2145 | int i; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2146 | unsigned int old_data = btrfs_item_end_nr(leaf, slot); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2147 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2148 | if (old_data < data_end) { |
| 2149 | btrfs_print_leaf(root, leaf); |
| 2150 | printk("slot %d old_data %d data_end %d\n", |
| 2151 | slot, old_data, data_end); |
| 2152 | BUG_ON(1); |
| 2153 | } |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2154 | /* |
| 2155 | * item0..itemN ... dataN.offset..dataN.size .. data0.size |
| 2156 | */ |
| 2157 | /* first correct the data pointers */ |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2158 | WARN_ON(leaf->map_token); |
Chris Mason | 0783fcf | 2007-03-12 20:12:07 -0400 | [diff] [blame] | 2159 | for (i = slot; i < nritems; i++) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2160 | u32 ioff; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2161 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2162 | item = btrfs_item_nr(leaf, i); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2163 | if (!leaf->map_token) { |
| 2164 | map_extent_buffer(leaf, (unsigned long)item, |
| 2165 | sizeof(struct btrfs_item), |
| 2166 | &leaf->map_token, &leaf->kaddr, |
| 2167 | &leaf->map_start, &leaf->map_len, |
| 2168 | KM_USER1); |
| 2169 | } |
| 2170 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2171 | ioff = btrfs_item_offset(leaf, item); |
| 2172 | btrfs_set_item_offset(leaf, item, ioff - data_size); |
Chris Mason | 0783fcf | 2007-03-12 20:12:07 -0400 | [diff] [blame] | 2173 | } |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2174 | if (leaf->map_token) { |
| 2175 | unmap_extent_buffer(leaf, leaf->map_token, KM_USER1); |
| 2176 | leaf->map_token = NULL; |
| 2177 | } |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2178 | |
| 2179 | /* shift the items */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2180 | memmove_extent_buffer(leaf, btrfs_item_nr_offset(slot + 1), |
| 2181 | btrfs_item_nr_offset(slot), |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 2182 | (nritems - slot) * sizeof(struct btrfs_item)); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2183 | |
| 2184 | /* shift the data */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2185 | memmove_extent_buffer(leaf, btrfs_leaf_data(leaf) + |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 2186 | data_end - data_size, btrfs_leaf_data(leaf) + |
| 2187 | data_end, old_data - data_end); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2188 | data_end = old_data; |
| 2189 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2190 | |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 2191 | /* setup the item for the new data */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2192 | btrfs_set_item_key(leaf, &disk_key, slot); |
| 2193 | item = btrfs_item_nr(leaf, slot); |
| 2194 | btrfs_set_item_offset(leaf, item, data_end - data_size); |
| 2195 | btrfs_set_item_size(leaf, item, data_size); |
| 2196 | btrfs_set_header_nritems(leaf, nritems + 1); |
| 2197 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 2198 | |
| 2199 | ret = 0; |
Chris Mason | 8e19f2c | 2007-02-28 09:27:02 -0500 | [diff] [blame] | 2200 | if (slot == 0) |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 2201 | ret = fixup_low_keys(trans, root, path, &disk_key, 1); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 2202 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2203 | if (btrfs_leaf_free_space(root, leaf) < 0) { |
| 2204 | btrfs_print_leaf(root, leaf); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2205 | BUG(); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2206 | } |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 2207 | out: |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 2208 | return ret; |
| 2209 | } |
| 2210 | |
| 2211 | /* |
| 2212 | * Given a key and some data, insert an item into the tree. |
| 2213 | * This does all the path init required, making room in the tree if needed. |
| 2214 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 2215 | int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root |
| 2216 | *root, struct btrfs_key *cpu_key, void *data, u32 |
| 2217 | data_size) |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 2218 | { |
| 2219 | int ret = 0; |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 2220 | struct btrfs_path *path; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2221 | struct extent_buffer *leaf; |
| 2222 | unsigned long ptr; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 2223 | |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 2224 | path = btrfs_alloc_path(); |
| 2225 | BUG_ON(!path); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 2226 | ret = btrfs_insert_empty_item(trans, root, path, cpu_key, data_size); |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 2227 | if (!ret) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2228 | leaf = path->nodes[0]; |
| 2229 | ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); |
| 2230 | write_extent_buffer(leaf, data, ptr, data_size); |
| 2231 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 2232 | } |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 2233 | btrfs_free_path(path); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 2234 | return ret; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2235 | } |
| 2236 | |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 2237 | /* |
Chris Mason | 5de08d7 | 2007-02-24 06:24:44 -0500 | [diff] [blame] | 2238 | * delete the pointer from a given node. |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 2239 | * |
| 2240 | * If the delete empties a node, the node is removed from the tree, |
| 2241 | * continuing all the way the root if required. The root is converted into |
| 2242 | * a leaf if all the nodes are emptied. |
| 2243 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 2244 | static int del_ptr(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
| 2245 | struct btrfs_path *path, int level, int slot) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2246 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2247 | struct extent_buffer *parent = path->nodes[level]; |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 2248 | u32 nritems; |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 2249 | int ret = 0; |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 2250 | int wret; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2251 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2252 | nritems = btrfs_header_nritems(parent); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 2253 | if (slot != nritems -1) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2254 | memmove_extent_buffer(parent, |
| 2255 | btrfs_node_key_ptr_offset(slot), |
| 2256 | btrfs_node_key_ptr_offset(slot + 1), |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 2257 | sizeof(struct btrfs_key_ptr) * |
| 2258 | (nritems - slot - 1)); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 2259 | } |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 2260 | nritems--; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2261 | btrfs_set_header_nritems(parent, nritems); |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 2262 | if (nritems == 0 && parent == root->node) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2263 | BUG_ON(btrfs_header_level(root->node) != 1); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 2264 | /* just turn the root into a leaf and break */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2265 | btrfs_set_header_level(root->node, 0); |
Chris Mason | bb80395 | 2007-03-01 12:04:21 -0500 | [diff] [blame] | 2266 | } else if (slot == 0) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2267 | struct btrfs_disk_key disk_key; |
| 2268 | |
| 2269 | btrfs_node_key(parent, &disk_key, 0); |
| 2270 | wret = fixup_low_keys(trans, root, path, &disk_key, level + 1); |
Chris Mason | 0f70abe | 2007-02-28 16:46:22 -0500 | [diff] [blame] | 2271 | if (wret) |
| 2272 | ret = wret; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2273 | } |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 2274 | btrfs_mark_buffer_dirty(parent); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 2275 | return ret; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2276 | } |
| 2277 | |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 2278 | /* |
| 2279 | * delete the item at the leaf level in path. If that empties |
| 2280 | * the leaf, remove it from the tree |
| 2281 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 2282 | int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
| 2283 | struct btrfs_path *path) |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2284 | { |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2285 | int slot; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2286 | struct extent_buffer *leaf; |
| 2287 | struct btrfs_item *item; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2288 | int doff; |
| 2289 | int dsize; |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 2290 | int ret = 0; |
| 2291 | int wret; |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 2292 | u32 nritems; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2293 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2294 | leaf = path->nodes[0]; |
Chris Mason | 4920c9a | 2007-01-26 16:38:42 -0500 | [diff] [blame] | 2295 | slot = path->slots[0]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2296 | doff = btrfs_item_offset_nr(leaf, slot); |
| 2297 | dsize = btrfs_item_size_nr(leaf, slot); |
| 2298 | nritems = btrfs_header_nritems(leaf); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2299 | |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 2300 | if (slot != nritems - 1) { |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2301 | int i; |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 2302 | int data_end = leaf_data_end(root, leaf); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2303 | |
| 2304 | memmove_extent_buffer(leaf, btrfs_leaf_data(leaf) + |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 2305 | data_end + dsize, |
| 2306 | btrfs_leaf_data(leaf) + data_end, |
| 2307 | doff - data_end); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2308 | |
Chris Mason | 0783fcf | 2007-03-12 20:12:07 -0400 | [diff] [blame] | 2309 | for (i = slot + 1; i < nritems; i++) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2310 | u32 ioff; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2311 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2312 | item = btrfs_item_nr(leaf, i); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2313 | if (!leaf->map_token) { |
| 2314 | map_extent_buffer(leaf, (unsigned long)item, |
| 2315 | sizeof(struct btrfs_item), |
| 2316 | &leaf->map_token, &leaf->kaddr, |
| 2317 | &leaf->map_start, &leaf->map_len, |
| 2318 | KM_USER1); |
| 2319 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2320 | ioff = btrfs_item_offset(leaf, item); |
| 2321 | btrfs_set_item_offset(leaf, item, ioff + dsize); |
Chris Mason | 0783fcf | 2007-03-12 20:12:07 -0400 | [diff] [blame] | 2322 | } |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2323 | |
| 2324 | if (leaf->map_token) { |
| 2325 | unmap_extent_buffer(leaf, leaf->map_token, KM_USER1); |
| 2326 | leaf->map_token = NULL; |
| 2327 | } |
| 2328 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2329 | memmove_extent_buffer(leaf, btrfs_item_nr_offset(slot), |
| 2330 | btrfs_item_nr_offset(slot + 1), |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 2331 | sizeof(struct btrfs_item) * |
| 2332 | (nritems - slot - 1)); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2333 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2334 | btrfs_set_header_nritems(leaf, nritems - 1); |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 2335 | nritems--; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2336 | |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 2337 | /* delete the leaf if we've emptied it */ |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 2338 | if (nritems == 0) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2339 | if (leaf == root->node) { |
| 2340 | btrfs_set_header_level(leaf, 0); |
Chris Mason | 9a8dd15 | 2007-02-23 08:38:36 -0500 | [diff] [blame] | 2341 | } else { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2342 | clean_tree_block(trans, root, leaf); |
| 2343 | wait_on_tree_block_writeback(root, leaf); |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 2344 | wret = del_ptr(trans, root, path, 1, path->slots[1]); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 2345 | if (wret) |
| 2346 | ret = wret; |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 2347 | wret = btrfs_free_extent(trans, root, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2348 | leaf->start, leaf->len, 1); |
Chris Mason | 0f70abe | 2007-02-28 16:46:22 -0500 | [diff] [blame] | 2349 | if (wret) |
| 2350 | ret = wret; |
Chris Mason | 9a8dd15 | 2007-02-23 08:38:36 -0500 | [diff] [blame] | 2351 | } |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2352 | } else { |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 2353 | int used = leaf_space_used(leaf, 0, nritems); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 2354 | if (slot == 0) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2355 | struct btrfs_disk_key disk_key; |
| 2356 | |
| 2357 | btrfs_item_key(leaf, &disk_key, 0); |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 2358 | wret = fixup_low_keys(trans, root, path, |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2359 | &disk_key, 1); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 2360 | if (wret) |
| 2361 | ret = wret; |
| 2362 | } |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 2363 | |
Chris Mason | 74123bd | 2007-02-02 11:05:29 -0500 | [diff] [blame] | 2364 | /* delete the leaf if it is mostly empty */ |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 2365 | if (used < BTRFS_LEAF_DATA_SIZE(root) / 3) { |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2366 | /* push_leaf_left fixes the path. |
| 2367 | * make sure the path still points to our leaf |
| 2368 | * for possible call to del_ptr below |
| 2369 | */ |
Chris Mason | 4920c9a | 2007-01-26 16:38:42 -0500 | [diff] [blame] | 2370 | slot = path->slots[1]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2371 | extent_buffer_get(leaf); |
| 2372 | |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 2373 | wret = push_leaf_left(trans, root, path, 1); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 2374 | if (wret < 0 && wret != -ENOSPC) |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 2375 | ret = wret; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2376 | |
| 2377 | if (path->nodes[0] == leaf && |
| 2378 | btrfs_header_nritems(leaf)) { |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 2379 | wret = push_leaf_right(trans, root, path, 1); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 2380 | if (wret < 0 && wret != -ENOSPC) |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 2381 | ret = wret; |
| 2382 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2383 | |
| 2384 | if (btrfs_header_nritems(leaf) == 0) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2385 | u64 bytenr = leaf->start; |
| 2386 | u32 blocksize = leaf->len; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2387 | |
| 2388 | clean_tree_block(trans, root, leaf); |
| 2389 | wait_on_tree_block_writeback(root, leaf); |
| 2390 | |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 2391 | wret = del_ptr(trans, root, path, 1, slot); |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 2392 | if (wret) |
| 2393 | ret = wret; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2394 | |
| 2395 | free_extent_buffer(leaf); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2396 | wret = btrfs_free_extent(trans, root, bytenr, |
| 2397 | blocksize, 1); |
Chris Mason | 0f70abe | 2007-02-28 16:46:22 -0500 | [diff] [blame] | 2398 | if (wret) |
| 2399 | ret = wret; |
Chris Mason | 5de08d7 | 2007-02-24 06:24:44 -0500 | [diff] [blame] | 2400 | } else { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2401 | btrfs_mark_buffer_dirty(leaf); |
| 2402 | free_extent_buffer(leaf); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2403 | } |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 2404 | } else { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2405 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2406 | } |
| 2407 | } |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 2408 | return ret; |
Chris Mason | be0e5c0 | 2007-01-26 15:51:26 -0500 | [diff] [blame] | 2409 | } |
| 2410 | |
Chris Mason | 97571fd | 2007-02-24 13:39:08 -0500 | [diff] [blame] | 2411 | /* |
| 2412 | * 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] | 2413 | * returns 0 if it found something or 1 if there are no greater leaves. |
| 2414 | * returns < 0 on io errors. |
Chris Mason | 97571fd | 2007-02-24 13:39:08 -0500 | [diff] [blame] | 2415 | */ |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 2416 | int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path) |
Chris Mason | d97e63b | 2007-02-20 16:40:44 -0500 | [diff] [blame] | 2417 | { |
| 2418 | int slot; |
| 2419 | int level = 1; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2420 | u64 bytenr; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2421 | struct extent_buffer *c; |
| 2422 | struct extent_buffer *next = NULL; |
Chris Mason | d97e63b | 2007-02-20 16:40:44 -0500 | [diff] [blame] | 2423 | |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 2424 | while(level < BTRFS_MAX_LEVEL) { |
Chris Mason | d97e63b | 2007-02-20 16:40:44 -0500 | [diff] [blame] | 2425 | if (!path->nodes[level]) |
Chris Mason | 0f70abe | 2007-02-28 16:46:22 -0500 | [diff] [blame] | 2426 | return 1; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2427 | |
Chris Mason | d97e63b | 2007-02-20 16:40:44 -0500 | [diff] [blame] | 2428 | slot = path->slots[level] + 1; |
| 2429 | c = path->nodes[level]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2430 | if (slot >= btrfs_header_nritems(c)) { |
Chris Mason | d97e63b | 2007-02-20 16:40:44 -0500 | [diff] [blame] | 2431 | level++; |
| 2432 | continue; |
| 2433 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2434 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2435 | bytenr = btrfs_node_blockptr(c, slot); |
Chris Mason | cfaa729 | 2007-02-21 17:04:57 -0500 | [diff] [blame] | 2436 | if (next) |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2437 | free_extent_buffer(next); |
| 2438 | |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 2439 | if (path->reada) |
| 2440 | reada_for_search(root, path, level, slot); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2441 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2442 | next = read_tree_block(root, bytenr, |
| 2443 | btrfs_level_size(root, level -1)); |
Chris Mason | d97e63b | 2007-02-20 16:40:44 -0500 | [diff] [blame] | 2444 | break; |
| 2445 | } |
| 2446 | path->slots[level] = slot; |
| 2447 | while(1) { |
| 2448 | level--; |
| 2449 | c = path->nodes[level]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2450 | free_extent_buffer(c); |
Chris Mason | d97e63b | 2007-02-20 16:40:44 -0500 | [diff] [blame] | 2451 | path->nodes[level] = next; |
| 2452 | path->slots[level] = 0; |
| 2453 | if (!level) |
| 2454 | break; |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 2455 | if (path->reada) |
Yan | 3202061 | 2007-08-27 15:17:54 -0400 | [diff] [blame] | 2456 | reada_for_search(root, path, level, 0); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2457 | next = read_tree_block(root, btrfs_node_blockptr(next, 0), |
| 2458 | btrfs_level_size(root, level - 1)); |
Chris Mason | d97e63b | 2007-02-20 16:40:44 -0500 | [diff] [blame] | 2459 | } |
| 2460 | return 0; |
| 2461 | } |