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 | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 19 | #include "ctree.h" |
| 20 | #include "disk-io.h" |
| 21 | #include "hash.h" |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 22 | #include "transaction.h" |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 23 | |
Eric Sandeen | 48a3b63 | 2013-04-25 20:41:01 +0000 | [diff] [blame] | 24 | static struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root, |
| 25 | struct btrfs_path *path, |
| 26 | const char *name, int name_len); |
| 27 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 28 | /* |
| 29 | * insert a name into a directory, doing overflow properly if there is a hash |
| 30 | * collision. data_size indicates how big the item inserted should be. On |
| 31 | * success a struct btrfs_dir_item pointer is returned, otherwise it is |
| 32 | * an ERR_PTR. |
| 33 | * |
| 34 | * The name is not copied into the dir item, you have to do that yourself. |
| 35 | */ |
Chris Mason | 35b7e47 | 2007-05-02 15:53:43 -0400 | [diff] [blame] | 36 | static struct btrfs_dir_item *insert_with_overflow(struct btrfs_trans_handle |
| 37 | *trans, |
| 38 | struct btrfs_root *root, |
| 39 | struct btrfs_path *path, |
| 40 | struct btrfs_key *cpu_key, |
Chris Mason | e06afa8 | 2007-05-23 15:44:28 -0400 | [diff] [blame] | 41 | u32 data_size, |
| 42 | const char *name, |
| 43 | int name_len) |
Chris Mason | 7fcde0e | 2007-04-05 12:13:21 -0400 | [diff] [blame] | 44 | { |
Chris Mason | 7fcde0e | 2007-04-05 12:13:21 -0400 | [diff] [blame] | 45 | int ret; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 46 | char *ptr; |
| 47 | struct btrfs_item *item; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 48 | struct extent_buffer *leaf; |
Chris Mason | 7fcde0e | 2007-04-05 12:13:21 -0400 | [diff] [blame] | 49 | |
| 50 | ret = btrfs_insert_empty_item(trans, root, path, cpu_key, data_size); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 51 | if (ret == -EEXIST) { |
Chris Mason | e06afa8 | 2007-05-23 15:44:28 -0400 | [diff] [blame] | 52 | struct btrfs_dir_item *di; |
| 53 | di = btrfs_match_dir_item_name(root, path, name, name_len); |
| 54 | if (di) |
| 55 | return ERR_PTR(-EEXIST); |
Tsutomu Itoh | 4b90c68 | 2013-04-16 05:18:49 +0000 | [diff] [blame] | 56 | btrfs_extend_item(root, path, data_size); |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 57 | } else if (ret < 0) |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 58 | return ERR_PTR(ret); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 59 | WARN_ON(ret > 0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 60 | leaf = path->nodes[0]; |
Ross Kirk | dd3cc16 | 2013-09-16 15:58:09 +0100 | [diff] [blame^] | 61 | item = btrfs_item_nr(path->slots[0]); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 62 | ptr = btrfs_item_ptr(leaf, path->slots[0], char); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 63 | BUG_ON(data_size > btrfs_item_size(leaf, item)); |
| 64 | ptr += btrfs_item_size(leaf, item) - data_size; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 65 | return (struct btrfs_dir_item *)ptr; |
Chris Mason | 7fcde0e | 2007-04-05 12:13:21 -0400 | [diff] [blame] | 66 | } |
| 67 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 68 | /* |
| 69 | * xattrs work a lot like directories, this inserts an xattr item |
| 70 | * into the tree |
| 71 | */ |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 72 | int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans, |
Yan, Zheng | f34f57a | 2009-11-12 09:35:27 +0000 | [diff] [blame] | 73 | struct btrfs_root *root, |
| 74 | struct btrfs_path *path, u64 objectid, |
| 75 | const char *name, u16 name_len, |
| 76 | const void *data, u16 data_len) |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 77 | { |
| 78 | int ret = 0; |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 79 | struct btrfs_dir_item *dir_item; |
| 80 | unsigned long name_ptr, data_ptr; |
| 81 | struct btrfs_key key, location; |
| 82 | struct btrfs_disk_key disk_key; |
| 83 | struct extent_buffer *leaf; |
| 84 | u32 data_size; |
| 85 | |
Yan, Zheng | f34f57a | 2009-11-12 09:35:27 +0000 | [diff] [blame] | 86 | BUG_ON(name_len + data_len > BTRFS_MAX_XATTR_SIZE(root)); |
| 87 | |
| 88 | key.objectid = objectid; |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 89 | btrfs_set_key_type(&key, BTRFS_XATTR_ITEM_KEY); |
David Miller | df68b8a | 2008-02-15 10:40:52 -0500 | [diff] [blame] | 90 | key.offset = btrfs_name_hash(name, name_len); |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 91 | |
| 92 | data_size = sizeof(*dir_item) + name_len + data_len; |
| 93 | dir_item = insert_with_overflow(trans, root, path, &key, data_size, |
| 94 | name, name_len); |
Josef Bacik | fa09200 | 2011-05-27 12:06:11 -0400 | [diff] [blame] | 95 | if (IS_ERR(dir_item)) |
| 96 | return PTR_ERR(dir_item); |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 97 | memset(&location, 0, sizeof(location)); |
| 98 | |
| 99 | leaf = path->nodes[0]; |
| 100 | btrfs_cpu_key_to_disk(&disk_key, &location); |
| 101 | btrfs_set_dir_item_key(leaf, dir_item, &disk_key); |
| 102 | btrfs_set_dir_type(leaf, dir_item, BTRFS_FT_XATTR); |
| 103 | btrfs_set_dir_name_len(leaf, dir_item, name_len); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 104 | btrfs_set_dir_transid(leaf, dir_item, trans->transid); |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 105 | btrfs_set_dir_data_len(leaf, dir_item, data_len); |
| 106 | name_ptr = (unsigned long)(dir_item + 1); |
| 107 | data_ptr = (unsigned long)((char *)name_ptr + name_len); |
| 108 | |
| 109 | write_extent_buffer(leaf, name, name_ptr, name_len); |
| 110 | write_extent_buffer(leaf, data, data_ptr, data_len); |
| 111 | btrfs_mark_buffer_dirty(path->nodes[0]); |
| 112 | |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 113 | return ret; |
| 114 | } |
| 115 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 116 | /* |
| 117 | * insert a directory item in the tree, doing all the magic for |
| 118 | * both indexes. 'dir' indicates which objectid to insert it into, |
| 119 | * 'location' is the key to stuff into the directory item, 'type' is the |
| 120 | * type of the inode we're pointing to, and 'index' is the sequence number |
| 121 | * to use for the second index (if one is created). |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 122 | * Will return 0 or -ENOMEM |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 123 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 124 | int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 125 | *root, const char *name, int name_len, |
| 126 | struct inode *dir, struct btrfs_key *location, |
| 127 | u8 type, u64 index) |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 128 | { |
| 129 | int ret = 0; |
Chris Mason | e06afa8 | 2007-05-23 15:44:28 -0400 | [diff] [blame] | 130 | int ret2 = 0; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 131 | struct btrfs_path *path; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 132 | struct btrfs_dir_item *dir_item; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 133 | struct extent_buffer *leaf; |
| 134 | unsigned long name_ptr; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 135 | struct btrfs_key key; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 136 | struct btrfs_disk_key disk_key; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 137 | u32 data_size; |
| 138 | |
Chris Mason | 0d0ca30 | 2011-05-22 07:11:22 -0400 | [diff] [blame] | 139 | key.objectid = btrfs_ino(dir); |
Chris Mason | 1d4f640 | 2007-03-15 15:18:43 -0400 | [diff] [blame] | 140 | btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY); |
David Miller | df68b8a | 2008-02-15 10:40:52 -0500 | [diff] [blame] | 141 | key.offset = btrfs_name_hash(name, name_len); |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 142 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 143 | path = btrfs_alloc_path(); |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 144 | if (!path) |
| 145 | return -ENOMEM; |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 146 | path->leave_spinning = 1; |
| 147 | |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 148 | btrfs_cpu_key_to_disk(&disk_key, location); |
| 149 | |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 150 | data_size = sizeof(*dir_item) + name_len; |
Chris Mason | e06afa8 | 2007-05-23 15:44:28 -0400 | [diff] [blame] | 151 | dir_item = insert_with_overflow(trans, root, path, &key, data_size, |
| 152 | name, name_len); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 153 | if (IS_ERR(dir_item)) { |
| 154 | ret = PTR_ERR(dir_item); |
Chris Mason | e06afa8 | 2007-05-23 15:44:28 -0400 | [diff] [blame] | 155 | if (ret == -EEXIST) |
| 156 | goto second_insert; |
Tsutomu Itoh | c2db107 | 2011-03-01 06:48:31 +0000 | [diff] [blame] | 157 | goto out_free; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 158 | } |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 159 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 160 | leaf = path->nodes[0]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 161 | btrfs_set_dir_item_key(leaf, dir_item, &disk_key); |
| 162 | btrfs_set_dir_type(leaf, dir_item, type); |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 163 | btrfs_set_dir_data_len(leaf, dir_item, 0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 164 | btrfs_set_dir_name_len(leaf, dir_item, name_len); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 165 | btrfs_set_dir_transid(leaf, dir_item, trans->transid); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 166 | name_ptr = (unsigned long)(dir_item + 1); |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 167 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 168 | write_extent_buffer(leaf, name, name_ptr, name_len); |
| 169 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 170 | |
Chris Mason | e06afa8 | 2007-05-23 15:44:28 -0400 | [diff] [blame] | 171 | second_insert: |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 172 | /* FIXME, use some real flag for selecting the extra index */ |
| 173 | if (root == root->fs_info->tree_root) { |
| 174 | ret = 0; |
Tsutomu Itoh | c2db107 | 2011-03-01 06:48:31 +0000 | [diff] [blame] | 175 | goto out_free; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 176 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 177 | btrfs_release_path(path); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 178 | |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 179 | ret2 = btrfs_insert_delayed_dir_index(trans, root, name, name_len, dir, |
| 180 | &disk_key, type, index); |
Tsutomu Itoh | c2db107 | 2011-03-01 06:48:31 +0000 | [diff] [blame] | 181 | out_free: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 182 | btrfs_free_path(path); |
Chris Mason | e06afa8 | 2007-05-23 15:44:28 -0400 | [diff] [blame] | 183 | if (ret) |
| 184 | return ret; |
| 185 | if (ret2) |
| 186 | return ret2; |
| 187 | return 0; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 188 | } |
| 189 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 190 | /* |
| 191 | * lookup a directory item based on name. 'dir' is the objectid |
| 192 | * we're searching in, and 'mod' tells us if you plan on deleting the |
| 193 | * item (use mod < 0) or changing the options (use mod > 0) |
| 194 | */ |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 195 | struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, |
| 196 | struct btrfs_root *root, |
| 197 | struct btrfs_path *path, u64 dir, |
| 198 | const char *name, int name_len, |
| 199 | int mod) |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 200 | { |
Chris Mason | 1d4f640 | 2007-03-15 15:18:43 -0400 | [diff] [blame] | 201 | int ret; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 202 | struct btrfs_key key; |
Chris Mason | 1d4f640 | 2007-03-15 15:18:43 -0400 | [diff] [blame] | 203 | int ins_len = mod < 0 ? -1 : 0; |
| 204 | int cow = mod != 0; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 205 | |
| 206 | key.objectid = dir; |
Chris Mason | 1d4f640 | 2007-03-15 15:18:43 -0400 | [diff] [blame] | 207 | btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 208 | |
David Miller | df68b8a | 2008-02-15 10:40:52 -0500 | [diff] [blame] | 209 | key.offset = btrfs_name_hash(name, name_len); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 210 | |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 211 | ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); |
| 212 | if (ret < 0) |
| 213 | return ERR_PTR(ret); |
Li Zefan | 85d85a7 | 2011-07-14 03:17:52 +0000 | [diff] [blame] | 214 | if (ret > 0) |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 215 | return NULL; |
| 216 | |
| 217 | return btrfs_match_dir_item_name(root, path, name, name_len); |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 218 | } |
| 219 | |
Chris Mason | 9c52057 | 2012-12-17 14:26:57 -0500 | [diff] [blame] | 220 | int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir, |
| 221 | const char *name, int name_len) |
| 222 | { |
| 223 | int ret; |
| 224 | struct btrfs_key key; |
| 225 | struct btrfs_dir_item *di; |
| 226 | int data_size; |
| 227 | struct extent_buffer *leaf; |
| 228 | int slot; |
| 229 | struct btrfs_path *path; |
| 230 | |
| 231 | |
| 232 | path = btrfs_alloc_path(); |
| 233 | if (!path) |
| 234 | return -ENOMEM; |
| 235 | |
| 236 | key.objectid = dir; |
| 237 | btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY); |
| 238 | key.offset = btrfs_name_hash(name, name_len); |
| 239 | |
| 240 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 241 | |
| 242 | /* return back any errors */ |
| 243 | if (ret < 0) |
| 244 | goto out; |
| 245 | |
| 246 | /* nothing found, we're safe */ |
| 247 | if (ret > 0) { |
| 248 | ret = 0; |
| 249 | goto out; |
| 250 | } |
| 251 | |
| 252 | /* we found an item, look for our name in the item */ |
| 253 | di = btrfs_match_dir_item_name(root, path, name, name_len); |
| 254 | if (di) { |
| 255 | /* our exact name was found */ |
| 256 | ret = -EEXIST; |
| 257 | goto out; |
| 258 | } |
| 259 | |
| 260 | /* |
| 261 | * see if there is room in the item to insert this |
| 262 | * name |
| 263 | */ |
| 264 | data_size = sizeof(*di) + name_len + sizeof(struct btrfs_item); |
| 265 | leaf = path->nodes[0]; |
| 266 | slot = path->slots[0]; |
| 267 | if (data_size + btrfs_item_size_nr(leaf, slot) + |
| 268 | sizeof(struct btrfs_item) > BTRFS_LEAF_DATA_SIZE(root)) { |
| 269 | ret = -EOVERFLOW; |
| 270 | } else { |
| 271 | /* plenty of insertion room */ |
| 272 | ret = 0; |
| 273 | } |
| 274 | out: |
| 275 | btrfs_free_path(path); |
| 276 | return ret; |
| 277 | } |
| 278 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 279 | /* |
| 280 | * lookup a directory item based on index. 'dir' is the objectid |
| 281 | * we're searching in, and 'mod' tells us if you plan on deleting the |
| 282 | * item (use mod < 0) or changing the options (use mod > 0) |
| 283 | * |
| 284 | * The name is used to make sure the index really points to the name you were |
| 285 | * looking for. |
| 286 | */ |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 287 | struct btrfs_dir_item * |
| 288 | btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans, |
| 289 | struct btrfs_root *root, |
| 290 | struct btrfs_path *path, u64 dir, |
| 291 | u64 objectid, const char *name, int name_len, |
| 292 | int mod) |
| 293 | { |
| 294 | int ret; |
| 295 | struct btrfs_key key; |
| 296 | int ins_len = mod < 0 ? -1 : 0; |
| 297 | int cow = mod != 0; |
| 298 | |
| 299 | key.objectid = dir; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 300 | btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY); |
| 301 | key.offset = objectid; |
| 302 | |
| 303 | ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); |
| 304 | if (ret < 0) |
| 305 | return ERR_PTR(ret); |
| 306 | if (ret > 0) |
| 307 | return ERR_PTR(-ENOENT); |
| 308 | return btrfs_match_dir_item_name(root, path, name, name_len); |
| 309 | } |
| 310 | |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 311 | struct btrfs_dir_item * |
| 312 | btrfs_search_dir_index_item(struct btrfs_root *root, |
| 313 | struct btrfs_path *path, u64 dirid, |
| 314 | const char *name, int name_len) |
| 315 | { |
| 316 | struct extent_buffer *leaf; |
| 317 | struct btrfs_dir_item *di; |
| 318 | struct btrfs_key key; |
| 319 | u32 nritems; |
| 320 | int ret; |
| 321 | |
| 322 | key.objectid = dirid; |
| 323 | key.type = BTRFS_DIR_INDEX_KEY; |
| 324 | key.offset = 0; |
| 325 | |
| 326 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 327 | if (ret < 0) |
| 328 | return ERR_PTR(ret); |
| 329 | |
| 330 | leaf = path->nodes[0]; |
| 331 | nritems = btrfs_header_nritems(leaf); |
| 332 | |
| 333 | while (1) { |
| 334 | if (path->slots[0] >= nritems) { |
| 335 | ret = btrfs_next_leaf(root, path); |
| 336 | if (ret < 0) |
| 337 | return ERR_PTR(ret); |
| 338 | if (ret > 0) |
| 339 | break; |
| 340 | leaf = path->nodes[0]; |
| 341 | nritems = btrfs_header_nritems(leaf); |
| 342 | continue; |
| 343 | } |
| 344 | |
| 345 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
| 346 | if (key.objectid != dirid || key.type != BTRFS_DIR_INDEX_KEY) |
| 347 | break; |
| 348 | |
| 349 | di = btrfs_match_dir_item_name(root, path, name, name_len); |
| 350 | if (di) |
| 351 | return di; |
| 352 | |
| 353 | path->slots[0]++; |
| 354 | } |
| 355 | return NULL; |
| 356 | } |
| 357 | |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 358 | struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans, |
| 359 | struct btrfs_root *root, |
| 360 | struct btrfs_path *path, u64 dir, |
| 361 | const char *name, u16 name_len, |
| 362 | int mod) |
| 363 | { |
| 364 | int ret; |
| 365 | struct btrfs_key key; |
| 366 | int ins_len = mod < 0 ? -1 : 0; |
| 367 | int cow = mod != 0; |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 368 | |
| 369 | key.objectid = dir; |
| 370 | btrfs_set_key_type(&key, BTRFS_XATTR_ITEM_KEY); |
David Miller | df68b8a | 2008-02-15 10:40:52 -0500 | [diff] [blame] | 371 | key.offset = btrfs_name_hash(name, name_len); |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 372 | ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); |
| 373 | if (ret < 0) |
| 374 | return ERR_PTR(ret); |
Li Zefan | 85d85a7 | 2011-07-14 03:17:52 +0000 | [diff] [blame] | 375 | if (ret > 0) |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 376 | return NULL; |
| 377 | |
| 378 | return btrfs_match_dir_item_name(root, path, name, name_len); |
| 379 | } |
| 380 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 381 | /* |
| 382 | * helper function to look at the directory item pointed to by 'path' |
| 383 | * this walks through all the entries in a dir item and finds one |
| 384 | * for a specific name. |
| 385 | */ |
Eric Sandeen | 48a3b63 | 2013-04-25 20:41:01 +0000 | [diff] [blame] | 386 | static struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root, |
Chris Mason | 7f5c151 | 2007-03-23 15:56:19 -0400 | [diff] [blame] | 387 | struct btrfs_path *path, |
| 388 | const char *name, int name_len) |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 389 | { |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 390 | struct btrfs_dir_item *dir_item; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 391 | unsigned long name_ptr; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 392 | u32 total_len; |
| 393 | u32 cur = 0; |
| 394 | u32 this_len; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 395 | struct extent_buffer *leaf; |
Chris Mason | a8a2ee0 | 2007-03-16 08:46:49 -0400 | [diff] [blame] | 396 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 397 | leaf = path->nodes[0]; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 398 | dir_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dir_item); |
Josef Bacik | 22a94d4 | 2011-03-16 16:47:17 -0400 | [diff] [blame] | 399 | if (verify_dir_item(root, leaf, dir_item)) |
| 400 | return NULL; |
| 401 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 402 | total_len = btrfs_item_size_nr(leaf, path->slots[0]); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 403 | while (cur < total_len) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 404 | this_len = sizeof(*dir_item) + |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 405 | btrfs_dir_name_len(leaf, dir_item) + |
| 406 | btrfs_dir_data_len(leaf, dir_item); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 407 | name_ptr = (unsigned long)(dir_item + 1); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 408 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 409 | if (btrfs_dir_name_len(leaf, dir_item) == name_len && |
| 410 | memcmp_extent_buffer(leaf, name, name_ptr, name_len) == 0) |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 411 | return dir_item; |
| 412 | |
| 413 | cur += this_len; |
| 414 | dir_item = (struct btrfs_dir_item *)((char *)dir_item + |
| 415 | this_len); |
| 416 | } |
| 417 | return NULL; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 418 | } |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 419 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 420 | /* |
| 421 | * given a pointer into a directory item, delete it. This |
| 422 | * handles items that have more than one entry in them. |
| 423 | */ |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 424 | int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans, |
| 425 | struct btrfs_root *root, |
| 426 | struct btrfs_path *path, |
| 427 | struct btrfs_dir_item *di) |
| 428 | { |
| 429 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 430 | struct extent_buffer *leaf; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 431 | u32 sub_item_len; |
| 432 | u32 item_len; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 433 | int ret = 0; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 434 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 435 | leaf = path->nodes[0]; |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 436 | sub_item_len = sizeof(*di) + btrfs_dir_name_len(leaf, di) + |
| 437 | btrfs_dir_data_len(leaf, di); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 438 | item_len = btrfs_item_size_nr(leaf, path->slots[0]); |
| 439 | if (sub_item_len == item_len) { |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 440 | ret = btrfs_del_item(trans, root, path); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 441 | } else { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 442 | /* MARKER */ |
| 443 | unsigned long ptr = (unsigned long)di; |
| 444 | unsigned long start; |
| 445 | |
| 446 | start = btrfs_item_ptr_offset(leaf, path->slots[0]); |
| 447 | memmove_extent_buffer(leaf, ptr, ptr + sub_item_len, |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 448 | item_len - (ptr + sub_item_len - start)); |
Tsutomu Itoh | afe5fea | 2013-04-16 05:18:22 +0000 | [diff] [blame] | 449 | btrfs_truncate_item(root, path, item_len - sub_item_len, 1); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 450 | } |
Andi Kleen | 411fc6b | 2010-10-29 15:14:31 -0400 | [diff] [blame] | 451 | return ret; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 452 | } |
Josef Bacik | 22a94d4 | 2011-03-16 16:47:17 -0400 | [diff] [blame] | 453 | |
| 454 | int verify_dir_item(struct btrfs_root *root, |
| 455 | struct extent_buffer *leaf, |
| 456 | struct btrfs_dir_item *dir_item) |
| 457 | { |
| 458 | u16 namelen = BTRFS_NAME_LEN; |
| 459 | u8 type = btrfs_dir_type(leaf, dir_item); |
| 460 | |
| 461 | if (type >= BTRFS_FT_MAX) { |
| 462 | printk(KERN_CRIT "btrfs: invalid dir item type: %d\n", |
| 463 | (int)type); |
| 464 | return 1; |
| 465 | } |
| 466 | |
| 467 | if (type == BTRFS_FT_XATTR) |
| 468 | namelen = XATTR_NAME_MAX; |
| 469 | |
| 470 | if (btrfs_dir_name_len(leaf, dir_item) > namelen) { |
Sergei Trofimovich | 9694b3f | 2011-05-20 20:20:31 +0000 | [diff] [blame] | 471 | printk(KERN_CRIT "btrfs: invalid dir item name len: %u\n", |
Josef Bacik | 22a94d4 | 2011-03-16 16:47:17 -0400 | [diff] [blame] | 472 | (unsigned)btrfs_dir_data_len(leaf, dir_item)); |
| 473 | return 1; |
| 474 | } |
| 475 | |
| 476 | /* BTRFS_MAX_XATTR_SIZE is the same for all dir items */ |
| 477 | if (btrfs_dir_data_len(leaf, dir_item) > BTRFS_MAX_XATTR_SIZE(root)) { |
| 478 | printk(KERN_CRIT "btrfs: invalid dir item data len: %u\n", |
| 479 | (unsigned)btrfs_dir_data_len(leaf, dir_item)); |
| 480 | return 1; |
| 481 | } |
| 482 | |
| 483 | return 0; |
| 484 | } |