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 | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 19 | #include "ctree.h" |
Chris Mason | 5eda7b5 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 20 | #include "transaction.h" |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 21 | #include "disk-io.h" |
| 22 | #include "print-tree.h" |
| 23 | |
Chris Mason | bf4ef67 | 2008-05-08 13:26:18 -0400 | [diff] [blame] | 24 | /* |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 25 | * lookup the root with the highest offset for a given objectid. The key we do |
| 26 | * find is copied into 'key'. If we find something return 0, otherwise 1, < 0 |
| 27 | * on error. |
| 28 | */ |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 29 | int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, |
| 30 | struct btrfs_root_item *item, struct btrfs_key *key) |
| 31 | { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 32 | struct btrfs_path *path; |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 33 | struct btrfs_key search_key; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 34 | struct btrfs_key found_key; |
| 35 | struct extent_buffer *l; |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 36 | int ret; |
| 37 | int slot; |
| 38 | |
| 39 | search_key.objectid = objectid; |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 40 | search_key.type = BTRFS_ROOT_ITEM_KEY; |
Chris Mason | 5eda7b5 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 41 | search_key.offset = (u64)-1; |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 42 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 43 | path = btrfs_alloc_path(); |
Tsutomu Itoh | db5b493 | 2011-03-23 08:14:16 +0000 | [diff] [blame] | 44 | if (!path) |
| 45 | return -ENOMEM; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 46 | ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0); |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 47 | if (ret < 0) |
| 48 | goto out; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 49 | |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 50 | BUG_ON(ret == 0); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 51 | if (path->slots[0] == 0) { |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 52 | ret = 1; |
| 53 | goto out; |
| 54 | } |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 55 | l = path->nodes[0]; |
| 56 | slot = path->slots[0] - 1; |
| 57 | btrfs_item_key_to_cpu(l, &found_key, slot); |
| 58 | if (found_key.objectid != objectid || |
| 59 | found_key.type != BTRFS_ROOT_ITEM_KEY) { |
| 60 | ret = 1; |
| 61 | goto out; |
| 62 | } |
| 63 | if (item) |
| 64 | read_extent_buffer(l, item, btrfs_item_ptr_offset(l, slot), |
| 65 | sizeof(*item)); |
| 66 | if (key) |
| 67 | memcpy(key, &found_key, sizeof(found_key)); |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 68 | ret = 0; |
| 69 | out: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 70 | btrfs_free_path(path); |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 71 | return ret; |
| 72 | } |
| 73 | |
Mark Fasheh | bf5f32e | 2011-07-14 21:23:06 +0000 | [diff] [blame] | 74 | void btrfs_set_root_node(struct btrfs_root_item *item, |
| 75 | struct extent_buffer *node) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 76 | { |
| 77 | btrfs_set_root_bytenr(item, node->start); |
| 78 | btrfs_set_root_level(item, btrfs_header_level(node)); |
| 79 | btrfs_set_root_generation(item, btrfs_header_generation(node)); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 80 | } |
| 81 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 82 | /* |
| 83 | * copy the data in 'item' into the btree |
| 84 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 85 | int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root |
| 86 | *root, struct btrfs_key *key, struct btrfs_root_item |
| 87 | *item) |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 88 | { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 89 | struct btrfs_path *path; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 90 | struct extent_buffer *l; |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 91 | int ret; |
| 92 | int slot; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 93 | unsigned long ptr; |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 94 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 95 | path = btrfs_alloc_path(); |
Jeff Mahoney | b45a9d8 | 2011-10-03 23:22:44 -0400 | [diff] [blame] | 96 | if (!path) |
| 97 | return -ENOMEM; |
| 98 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 99 | ret = btrfs_search_slot(trans, root, key, path, 0, 1); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame^] | 100 | if (ret < 0) { |
| 101 | btrfs_abort_transaction(trans, root, ret); |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 102 | goto out; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame^] | 103 | } |
Chris Mason | d666746 | 2008-01-03 14:51:00 -0500 | [diff] [blame] | 104 | |
| 105 | if (ret != 0) { |
| 106 | btrfs_print_leaf(root, path->nodes[0]); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 107 | printk(KERN_CRIT "unable to update root key %llu %u %llu\n", |
| 108 | (unsigned long long)key->objectid, key->type, |
| 109 | (unsigned long long)key->offset); |
Chris Mason | d666746 | 2008-01-03 14:51:00 -0500 | [diff] [blame] | 110 | BUG_ON(1); |
| 111 | } |
| 112 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 113 | l = path->nodes[0]; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 114 | slot = path->slots[0]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 115 | ptr = btrfs_item_ptr_offset(l, slot); |
| 116 | write_extent_buffer(l, item, ptr, sizeof(*item)); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 117 | btrfs_mark_buffer_dirty(path->nodes[0]); |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 118 | out: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 119 | btrfs_free_path(path); |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 120 | return ret; |
| 121 | } |
| 122 | |
Jeff Mahoney | d16cb05 | 2011-10-03 23:22:34 -0400 | [diff] [blame] | 123 | int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
| 124 | struct btrfs_key *key, struct btrfs_root_item *item) |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 125 | { |
Jeff Mahoney | d16cb05 | 2011-10-03 23:22:34 -0400 | [diff] [blame] | 126 | return btrfs_insert_item(trans, root, key, item, sizeof(*item)); |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 127 | } |
| 128 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 129 | /* |
| 130 | * at mount time we want to find all the old transaction snapshots that were in |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 131 | * the process of being deleted if we crashed. This is any root item with an |
| 132 | * offset lower than the latest root. They need to be queued for deletion to |
| 133 | * finish what was happening when we crashed. |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 134 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 135 | int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid) |
Chris Mason | 5eda7b5 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 136 | { |
| 137 | struct btrfs_root *dead_root; |
Chris Mason | 5eda7b5 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 138 | struct btrfs_root_item *ri; |
| 139 | struct btrfs_key key; |
Chris Mason | a7a16fd | 2008-06-26 10:34:20 -0400 | [diff] [blame] | 140 | struct btrfs_key found_key; |
Chris Mason | 5eda7b5 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 141 | struct btrfs_path *path; |
| 142 | int ret; |
| 143 | u32 nritems; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 144 | struct extent_buffer *leaf; |
Chris Mason | 5eda7b5 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 145 | int slot; |
| 146 | |
Chris Mason | 5ce14bb | 2007-09-11 11:15:39 -0400 | [diff] [blame] | 147 | key.objectid = objectid; |
Chris Mason | 5eda7b5 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 148 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
| 149 | key.offset = 0; |
| 150 | path = btrfs_alloc_path(); |
| 151 | if (!path) |
| 152 | return -ENOMEM; |
Chris Mason | a7a16fd | 2008-06-26 10:34:20 -0400 | [diff] [blame] | 153 | |
| 154 | again: |
Chris Mason | 5eda7b5 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 155 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 156 | if (ret < 0) |
| 157 | goto err; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 158 | while (1) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 159 | leaf = path->nodes[0]; |
| 160 | nritems = btrfs_header_nritems(leaf); |
Chris Mason | 5eda7b5 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 161 | slot = path->slots[0]; |
| 162 | if (slot >= nritems) { |
| 163 | ret = btrfs_next_leaf(root, path); |
| 164 | if (ret) |
| 165 | break; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 166 | leaf = path->nodes[0]; |
| 167 | nritems = btrfs_header_nritems(leaf); |
Chris Mason | 5eda7b5 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 168 | slot = path->slots[0]; |
| 169 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 170 | btrfs_item_key_to_cpu(leaf, &key, slot); |
Chris Mason | 5eda7b5 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 171 | if (btrfs_key_type(&key) != BTRFS_ROOT_ITEM_KEY) |
| 172 | goto next; |
Chris Mason | 5ce14bb | 2007-09-11 11:15:39 -0400 | [diff] [blame] | 173 | |
| 174 | if (key.objectid < objectid) |
| 175 | goto next; |
| 176 | |
| 177 | if (key.objectid > objectid) |
| 178 | break; |
| 179 | |
Chris Mason | 5eda7b5 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 180 | ri = btrfs_item_ptr(leaf, slot, struct btrfs_root_item); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 181 | if (btrfs_disk_root_refs(leaf, ri) != 0) |
Chris Mason | 5eda7b5 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 182 | goto next; |
Chris Mason | 5ce14bb | 2007-09-11 11:15:39 -0400 | [diff] [blame] | 183 | |
Chris Mason | a7a16fd | 2008-06-26 10:34:20 -0400 | [diff] [blame] | 184 | memcpy(&found_key, &key, sizeof(key)); |
| 185 | key.offset++; |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 186 | btrfs_release_path(path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 187 | dead_root = |
| 188 | btrfs_read_fs_root_no_radix(root->fs_info->tree_root, |
| 189 | &found_key); |
Aneesh | a1f3963 | 2007-07-11 10:03:27 -0400 | [diff] [blame] | 190 | if (IS_ERR(dead_root)) { |
| 191 | ret = PTR_ERR(dead_root); |
Chris Mason | 5eda7b5 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 192 | goto err; |
| 193 | } |
Chris Mason | 5ce14bb | 2007-09-11 11:15:39 -0400 | [diff] [blame] | 194 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 195 | ret = btrfs_add_dead_root(dead_root); |
Chris Mason | 5eda7b5 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 196 | if (ret) |
| 197 | goto err; |
Chris Mason | a7a16fd | 2008-06-26 10:34:20 -0400 | [diff] [blame] | 198 | goto again; |
Chris Mason | 5eda7b5 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 199 | next: |
| 200 | slot++; |
| 201 | path->slots[0]++; |
| 202 | } |
| 203 | ret = 0; |
| 204 | err: |
| 205 | btrfs_free_path(path); |
| 206 | return ret; |
| 207 | } |
| 208 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 209 | int btrfs_find_orphan_roots(struct btrfs_root *tree_root) |
| 210 | { |
| 211 | struct extent_buffer *leaf; |
| 212 | struct btrfs_path *path; |
| 213 | struct btrfs_key key; |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 214 | struct btrfs_key root_key; |
| 215 | struct btrfs_root *root; |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 216 | int err = 0; |
| 217 | int ret; |
| 218 | |
| 219 | path = btrfs_alloc_path(); |
| 220 | if (!path) |
| 221 | return -ENOMEM; |
| 222 | |
| 223 | key.objectid = BTRFS_ORPHAN_OBJECTID; |
| 224 | key.type = BTRFS_ORPHAN_ITEM_KEY; |
| 225 | key.offset = 0; |
| 226 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 227 | root_key.type = BTRFS_ROOT_ITEM_KEY; |
| 228 | root_key.offset = (u64)-1; |
| 229 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 230 | while (1) { |
| 231 | ret = btrfs_search_slot(NULL, tree_root, &key, path, 0, 0); |
| 232 | if (ret < 0) { |
| 233 | err = ret; |
| 234 | break; |
| 235 | } |
| 236 | |
| 237 | leaf = path->nodes[0]; |
| 238 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { |
| 239 | ret = btrfs_next_leaf(tree_root, path); |
| 240 | if (ret < 0) |
| 241 | err = ret; |
| 242 | if (ret != 0) |
| 243 | break; |
| 244 | leaf = path->nodes[0]; |
| 245 | } |
| 246 | |
| 247 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 248 | btrfs_release_path(path); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 249 | |
| 250 | if (key.objectid != BTRFS_ORPHAN_OBJECTID || |
| 251 | key.type != BTRFS_ORPHAN_ITEM_KEY) |
| 252 | break; |
| 253 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 254 | root_key.objectid = key.offset; |
| 255 | key.offset++; |
| 256 | |
| 257 | root = btrfs_read_fs_root_no_name(tree_root->fs_info, |
| 258 | &root_key); |
| 259 | if (!IS_ERR(root)) |
| 260 | continue; |
| 261 | |
| 262 | ret = PTR_ERR(root); |
| 263 | if (ret != -ENOENT) { |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 264 | err = ret; |
| 265 | break; |
| 266 | } |
| 267 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 268 | ret = btrfs_find_dead_roots(tree_root, root_key.objectid); |
| 269 | if (ret) { |
| 270 | err = ret; |
| 271 | break; |
| 272 | } |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 273 | } |
| 274 | |
| 275 | btrfs_free_path(path); |
| 276 | return err; |
| 277 | } |
| 278 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 279 | /* drop the root item for 'key' from 'root' */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 280 | int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
| 281 | struct btrfs_key *key) |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 282 | { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 283 | struct btrfs_path *path; |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 284 | int ret; |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 285 | struct btrfs_root_item *ri; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 286 | struct extent_buffer *leaf; |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 287 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 288 | path = btrfs_alloc_path(); |
Tsutomu Itoh | db5b493 | 2011-03-23 08:14:16 +0000 | [diff] [blame] | 289 | if (!path) |
| 290 | return -ENOMEM; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 291 | ret = btrfs_search_slot(trans, root, key, path, -1, 1); |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 292 | if (ret < 0) |
| 293 | goto out; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 294 | |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 295 | BUG_ON(ret != 0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 296 | leaf = path->nodes[0]; |
| 297 | ri = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_root_item); |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 298 | |
Chris Mason | 5eda7b5 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 299 | ret = btrfs_del_item(trans, root, path); |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 300 | out: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 301 | btrfs_free_path(path); |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 302 | return ret; |
| 303 | } |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 304 | |
| 305 | int btrfs_del_root_ref(struct btrfs_trans_handle *trans, |
| 306 | struct btrfs_root *tree_root, |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 307 | u64 root_id, u64 ref_id, u64 dirid, u64 *sequence, |
| 308 | const char *name, int name_len) |
| 309 | |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 310 | { |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 311 | struct btrfs_path *path; |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 312 | struct btrfs_root_ref *ref; |
| 313 | struct extent_buffer *leaf; |
| 314 | struct btrfs_key key; |
| 315 | unsigned long ptr; |
| 316 | int err = 0; |
| 317 | int ret; |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 318 | |
| 319 | path = btrfs_alloc_path(); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 320 | if (!path) |
| 321 | return -ENOMEM; |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 322 | |
| 323 | key.objectid = root_id; |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 324 | key.type = BTRFS_ROOT_BACKREF_KEY; |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 325 | key.offset = ref_id; |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 326 | again: |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 327 | ret = btrfs_search_slot(trans, tree_root, &key, path, -1, 1); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 328 | BUG_ON(ret < 0); |
| 329 | if (ret == 0) { |
| 330 | leaf = path->nodes[0]; |
| 331 | ref = btrfs_item_ptr(leaf, path->slots[0], |
| 332 | struct btrfs_root_ref); |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 333 | |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 334 | WARN_ON(btrfs_root_ref_dirid(leaf, ref) != dirid); |
| 335 | WARN_ON(btrfs_root_ref_name_len(leaf, ref) != name_len); |
| 336 | ptr = (unsigned long)(ref + 1); |
| 337 | WARN_ON(memcmp_extent_buffer(leaf, name, ptr, name_len)); |
| 338 | *sequence = btrfs_root_ref_sequence(leaf, ref); |
| 339 | |
| 340 | ret = btrfs_del_item(trans, tree_root, path); |
Tsutomu Itoh | 65a246c | 2011-05-19 04:37:44 +0000 | [diff] [blame] | 341 | if (ret) { |
| 342 | err = ret; |
| 343 | goto out; |
| 344 | } |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 345 | } else |
| 346 | err = -ENOENT; |
| 347 | |
| 348 | if (key.type == BTRFS_ROOT_BACKREF_KEY) { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 349 | btrfs_release_path(path); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 350 | key.objectid = ref_id; |
| 351 | key.type = BTRFS_ROOT_REF_KEY; |
| 352 | key.offset = root_id; |
| 353 | goto again; |
| 354 | } |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 355 | |
Tsutomu Itoh | 65a246c | 2011-05-19 04:37:44 +0000 | [diff] [blame] | 356 | out: |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 357 | btrfs_free_path(path); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 358 | return err; |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 359 | } |
| 360 | |
Chris Mason | ea9e8b1 | 2008-11-17 21:14:24 -0500 | [diff] [blame] | 361 | int btrfs_find_root_ref(struct btrfs_root *tree_root, |
| 362 | struct btrfs_path *path, |
| 363 | u64 root_id, u64 ref_id) |
| 364 | { |
| 365 | struct btrfs_key key; |
| 366 | int ret; |
| 367 | |
| 368 | key.objectid = root_id; |
| 369 | key.type = BTRFS_ROOT_REF_KEY; |
| 370 | key.offset = ref_id; |
| 371 | |
| 372 | ret = btrfs_search_slot(NULL, tree_root, &key, path, 0, 0); |
| 373 | return ret; |
| 374 | } |
| 375 | |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 376 | /* |
| 377 | * add a btrfs_root_ref item. type is either BTRFS_ROOT_REF_KEY |
| 378 | * or BTRFS_ROOT_BACKREF_KEY. |
| 379 | * |
| 380 | * The dirid, sequence, name and name_len refer to the directory entry |
| 381 | * that is referencing the root. |
| 382 | * |
| 383 | * For a forward ref, the root_id is the id of the tree referencing |
| 384 | * the root and ref_id is the id of the subvol or snapshot. |
| 385 | * |
| 386 | * For a back ref the root_id is the id of the subvol or snapshot and |
| 387 | * ref_id is the id of the tree referencing it. |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame^] | 388 | * |
| 389 | * Will return 0, -ENOMEM, or anything from the CoW path |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 390 | */ |
| 391 | int btrfs_add_root_ref(struct btrfs_trans_handle *trans, |
| 392 | struct btrfs_root *tree_root, |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 393 | u64 root_id, u64 ref_id, u64 dirid, u64 sequence, |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 394 | const char *name, int name_len) |
| 395 | { |
| 396 | struct btrfs_key key; |
| 397 | int ret; |
| 398 | struct btrfs_path *path; |
| 399 | struct btrfs_root_ref *ref; |
| 400 | struct extent_buffer *leaf; |
| 401 | unsigned long ptr; |
| 402 | |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 403 | path = btrfs_alloc_path(); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 404 | if (!path) |
| 405 | return -ENOMEM; |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 406 | |
| 407 | key.objectid = root_id; |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 408 | key.type = BTRFS_ROOT_BACKREF_KEY; |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 409 | key.offset = ref_id; |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 410 | again: |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 411 | ret = btrfs_insert_empty_item(trans, tree_root, path, &key, |
| 412 | sizeof(*ref) + name_len); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame^] | 413 | if (ret) { |
| 414 | btrfs_abort_transaction(trans, tree_root, ret); |
| 415 | btrfs_free_path(path); |
| 416 | return ret; |
| 417 | } |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 418 | |
| 419 | leaf = path->nodes[0]; |
| 420 | ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_root_ref); |
| 421 | btrfs_set_root_ref_dirid(leaf, ref, dirid); |
| 422 | btrfs_set_root_ref_sequence(leaf, ref, sequence); |
| 423 | btrfs_set_root_ref_name_len(leaf, ref, name_len); |
| 424 | ptr = (unsigned long)(ref + 1); |
| 425 | write_extent_buffer(leaf, name, ptr, name_len); |
| 426 | btrfs_mark_buffer_dirty(leaf); |
| 427 | |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 428 | if (key.type == BTRFS_ROOT_BACKREF_KEY) { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 429 | btrfs_release_path(path); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 430 | key.objectid = ref_id; |
| 431 | key.type = BTRFS_ROOT_REF_KEY; |
| 432 | key.offset = root_id; |
| 433 | goto again; |
| 434 | } |
| 435 | |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 436 | btrfs_free_path(path); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 437 | return 0; |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 438 | } |
Li Zefan | 08fe4db | 2011-03-28 02:01:25 +0000 | [diff] [blame] | 439 | |
| 440 | /* |
| 441 | * Old btrfs forgets to init root_item->flags and root_item->byte_limit |
| 442 | * for subvolumes. To work around this problem, we steal a bit from |
| 443 | * root_item->inode_item->flags, and use it to indicate if those fields |
| 444 | * have been properly initialized. |
| 445 | */ |
| 446 | void btrfs_check_and_init_root_item(struct btrfs_root_item *root_item) |
| 447 | { |
| 448 | u64 inode_flags = le64_to_cpu(root_item->inode.flags); |
| 449 | |
| 450 | if (!(inode_flags & BTRFS_INODE_ROOT_ITEM_INIT)) { |
| 451 | inode_flags |= BTRFS_INODE_ROOT_ITEM_INIT; |
| 452 | root_item->inode.flags = cpu_to_le64(inode_flags); |
| 453 | root_item->flags = 0; |
| 454 | root_item->byte_limit = 0; |
| 455 | } |
| 456 | } |