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