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 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 24 | /* |
| 25 | * insert a name into a directory, doing overflow properly if there is a hash |
| 26 | * collision. data_size indicates how big the item inserted should be. On |
| 27 | * success a struct btrfs_dir_item pointer is returned, otherwise it is |
| 28 | * an ERR_PTR. |
| 29 | * |
| 30 | * The name is not copied into the dir item, you have to do that yourself. |
| 31 | */ |
Chris Mason | 35b7e47 | 2007-05-02 15:53:43 -0400 | [diff] [blame] | 32 | static struct btrfs_dir_item *insert_with_overflow(struct btrfs_trans_handle |
| 33 | *trans, |
| 34 | struct btrfs_root *root, |
| 35 | struct btrfs_path *path, |
| 36 | struct btrfs_key *cpu_key, |
Chris Mason | e06afa8 | 2007-05-23 15:44:28 -0400 | [diff] [blame] | 37 | u32 data_size, |
| 38 | const char *name, |
| 39 | int name_len) |
Chris Mason | 7fcde0e | 2007-04-05 12:13:21 -0400 | [diff] [blame] | 40 | { |
Chris Mason | 7fcde0e | 2007-04-05 12:13:21 -0400 | [diff] [blame] | 41 | int ret; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 42 | char *ptr; |
| 43 | struct btrfs_item *item; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 44 | struct extent_buffer *leaf; |
Chris Mason | 7fcde0e | 2007-04-05 12:13:21 -0400 | [diff] [blame] | 45 | |
| 46 | ret = btrfs_insert_empty_item(trans, root, path, cpu_key, data_size); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 47 | if (ret == -EEXIST) { |
Chris Mason | e06afa8 | 2007-05-23 15:44:28 -0400 | [diff] [blame] | 48 | struct btrfs_dir_item *di; |
| 49 | di = btrfs_match_dir_item_name(root, path, name, name_len); |
| 50 | if (di) |
| 51 | return ERR_PTR(-EEXIST); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 52 | ret = btrfs_extend_item(trans, root, path, data_size); |
Chris Mason | 7fcde0e | 2007-04-05 12:13:21 -0400 | [diff] [blame] | 53 | } |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 54 | if (ret < 0) |
| 55 | return ERR_PTR(ret); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 56 | WARN_ON(ret > 0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 57 | leaf = path->nodes[0]; |
| 58 | item = btrfs_item_nr(leaf, path->slots[0]); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 59 | ptr = btrfs_item_ptr(leaf, path->slots[0], char); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 60 | BUG_ON(data_size > btrfs_item_size(leaf, item)); |
| 61 | ptr += btrfs_item_size(leaf, item) - data_size; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 62 | return (struct btrfs_dir_item *)ptr; |
Chris Mason | 7fcde0e | 2007-04-05 12:13:21 -0400 | [diff] [blame] | 63 | } |
| 64 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 65 | /* |
| 66 | * xattrs work a lot like directories, this inserts an xattr item |
| 67 | * into the tree |
| 68 | */ |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 69 | int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans, |
Yan, Zheng | f34f57a | 2009-11-12 09:35:27 +0000 | [diff] [blame] | 70 | struct btrfs_root *root, |
| 71 | struct btrfs_path *path, u64 objectid, |
| 72 | const char *name, u16 name_len, |
| 73 | const void *data, u16 data_len) |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 74 | { |
| 75 | int ret = 0; |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 76 | struct btrfs_dir_item *dir_item; |
| 77 | unsigned long name_ptr, data_ptr; |
| 78 | struct btrfs_key key, location; |
| 79 | struct btrfs_disk_key disk_key; |
| 80 | struct extent_buffer *leaf; |
| 81 | u32 data_size; |
| 82 | |
Yan, Zheng | f34f57a | 2009-11-12 09:35:27 +0000 | [diff] [blame] | 83 | BUG_ON(name_len + data_len > BTRFS_MAX_XATTR_SIZE(root)); |
| 84 | |
| 85 | key.objectid = objectid; |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 86 | btrfs_set_key_type(&key, BTRFS_XATTR_ITEM_KEY); |
David Miller | df68b8a | 2008-02-15 10:40:52 -0500 | [diff] [blame] | 87 | key.offset = btrfs_name_hash(name, name_len); |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 88 | |
| 89 | data_size = sizeof(*dir_item) + name_len + data_len; |
| 90 | dir_item = insert_with_overflow(trans, root, path, &key, data_size, |
| 91 | name, name_len); |
| 92 | /* |
| 93 | * FIXME: at some point we should handle xattr's that are larger than |
| 94 | * what we can fit in our leaf. We set location to NULL b/c we arent |
| 95 | * pointing at anything else, that will change if we store the xattr |
| 96 | * data in a separate inode. |
| 97 | */ |
| 98 | BUG_ON(IS_ERR(dir_item)); |
| 99 | memset(&location, 0, sizeof(location)); |
| 100 | |
| 101 | leaf = path->nodes[0]; |
| 102 | btrfs_cpu_key_to_disk(&disk_key, &location); |
| 103 | btrfs_set_dir_item_key(leaf, dir_item, &disk_key); |
| 104 | btrfs_set_dir_type(leaf, dir_item, BTRFS_FT_XATTR); |
| 105 | btrfs_set_dir_name_len(leaf, dir_item, name_len); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 106 | btrfs_set_dir_transid(leaf, dir_item, trans->transid); |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 107 | btrfs_set_dir_data_len(leaf, dir_item, data_len); |
| 108 | name_ptr = (unsigned long)(dir_item + 1); |
| 109 | data_ptr = (unsigned long)((char *)name_ptr + name_len); |
| 110 | |
| 111 | write_extent_buffer(leaf, name, name_ptr, name_len); |
| 112 | write_extent_buffer(leaf, data, data_ptr, data_len); |
| 113 | btrfs_mark_buffer_dirty(path->nodes[0]); |
| 114 | |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 115 | return ret; |
| 116 | } |
| 117 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 118 | /* |
| 119 | * insert a directory item in the tree, doing all the magic for |
| 120 | * both indexes. 'dir' indicates which objectid to insert it into, |
| 121 | * 'location' is the key to stuff into the directory item, 'type' is the |
| 122 | * type of the inode we're pointing to, and 'index' is the sequence number |
| 123 | * to use for the second index (if one is created). |
| 124 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 125 | 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] | 126 | *root, const char *name, int name_len, |
| 127 | struct inode *dir, struct btrfs_key *location, |
| 128 | u8 type, u64 index) |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 129 | { |
| 130 | int ret = 0; |
Chris Mason | e06afa8 | 2007-05-23 15:44:28 -0400 | [diff] [blame] | 131 | int ret2 = 0; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 132 | struct btrfs_path *path; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 133 | struct btrfs_dir_item *dir_item; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 134 | struct extent_buffer *leaf; |
| 135 | unsigned long name_ptr; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 136 | struct btrfs_key key; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 137 | struct btrfs_disk_key disk_key; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 138 | u32 data_size; |
| 139 | |
Chris Mason | 0d0ca30 | 2011-05-22 07:11:22 -0400 | [diff] [blame] | 140 | key.objectid = btrfs_ino(dir); |
Chris Mason | 1d4f640 | 2007-03-15 15:18:43 -0400 | [diff] [blame] | 141 | btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY); |
David Miller | df68b8a | 2008-02-15 10:40:52 -0500 | [diff] [blame] | 142 | key.offset = btrfs_name_hash(name, name_len); |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 143 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 144 | path = btrfs_alloc_path(); |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 145 | if (!path) |
| 146 | return -ENOMEM; |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 147 | path->leave_spinning = 1; |
| 148 | |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 149 | btrfs_cpu_key_to_disk(&disk_key, location); |
| 150 | |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 151 | data_size = sizeof(*dir_item) + name_len; |
Chris Mason | e06afa8 | 2007-05-23 15:44:28 -0400 | [diff] [blame] | 152 | dir_item = insert_with_overflow(trans, root, path, &key, data_size, |
| 153 | name, name_len); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 154 | if (IS_ERR(dir_item)) { |
| 155 | ret = PTR_ERR(dir_item); |
Chris Mason | e06afa8 | 2007-05-23 15:44:28 -0400 | [diff] [blame] | 156 | if (ret == -EEXIST) |
| 157 | goto second_insert; |
Tsutomu Itoh | c2db107 | 2011-03-01 06:48:31 +0000 | [diff] [blame] | 158 | goto out_free; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 159 | } |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 160 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 161 | leaf = path->nodes[0]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 162 | btrfs_set_dir_item_key(leaf, dir_item, &disk_key); |
| 163 | btrfs_set_dir_type(leaf, dir_item, type); |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 164 | btrfs_set_dir_data_len(leaf, dir_item, 0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 165 | btrfs_set_dir_name_len(leaf, dir_item, name_len); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 166 | btrfs_set_dir_transid(leaf, dir_item, trans->transid); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 167 | name_ptr = (unsigned long)(dir_item + 1); |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 168 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 169 | write_extent_buffer(leaf, name, name_ptr, name_len); |
| 170 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 171 | |
Chris Mason | e06afa8 | 2007-05-23 15:44:28 -0400 | [diff] [blame] | 172 | second_insert: |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 173 | /* FIXME, use some real flag for selecting the extra index */ |
| 174 | if (root == root->fs_info->tree_root) { |
| 175 | ret = 0; |
Tsutomu Itoh | c2db107 | 2011-03-01 06:48:31 +0000 | [diff] [blame] | 176 | goto out_free; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 177 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 178 | btrfs_release_path(path); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 179 | |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 180 | ret2 = btrfs_insert_delayed_dir_index(trans, root, name, name_len, dir, |
| 181 | &disk_key, type, index); |
Tsutomu Itoh | c2db107 | 2011-03-01 06:48:31 +0000 | [diff] [blame] | 182 | out_free: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 183 | btrfs_free_path(path); |
Chris Mason | e06afa8 | 2007-05-23 15:44:28 -0400 | [diff] [blame] | 184 | if (ret) |
| 185 | return ret; |
| 186 | if (ret2) |
| 187 | return ret2; |
| 188 | return 0; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 189 | } |
| 190 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 191 | /* |
| 192 | * lookup a directory item based on name. 'dir' is the objectid |
| 193 | * we're searching in, and 'mod' tells us if you plan on deleting the |
| 194 | * item (use mod < 0) or changing the options (use mod > 0) |
| 195 | */ |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 196 | struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, |
| 197 | struct btrfs_root *root, |
| 198 | struct btrfs_path *path, u64 dir, |
| 199 | const char *name, int name_len, |
| 200 | int mod) |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 201 | { |
Chris Mason | 1d4f640 | 2007-03-15 15:18:43 -0400 | [diff] [blame] | 202 | int ret; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 203 | struct btrfs_key key; |
Chris Mason | 1d4f640 | 2007-03-15 15:18:43 -0400 | [diff] [blame] | 204 | int ins_len = mod < 0 ? -1 : 0; |
| 205 | int cow = mod != 0; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 206 | struct btrfs_key found_key; |
| 207 | struct extent_buffer *leaf; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 208 | |
| 209 | key.objectid = dir; |
Chris Mason | 1d4f640 | 2007-03-15 15:18:43 -0400 | [diff] [blame] | 210 | btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 211 | |
David Miller | df68b8a | 2008-02-15 10:40:52 -0500 | [diff] [blame] | 212 | key.offset = btrfs_name_hash(name, name_len); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 213 | |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 214 | ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); |
| 215 | if (ret < 0) |
| 216 | return ERR_PTR(ret); |
| 217 | if (ret > 0) { |
| 218 | if (path->slots[0] == 0) |
| 219 | return NULL; |
| 220 | path->slots[0]--; |
Chris Mason | 7fcde0e | 2007-04-05 12:13:21 -0400 | [diff] [blame] | 221 | } |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 222 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 223 | leaf = path->nodes[0]; |
| 224 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
| 225 | |
| 226 | if (found_key.objectid != dir || |
| 227 | btrfs_key_type(&found_key) != BTRFS_DIR_ITEM_KEY || |
| 228 | found_key.offset != key.offset) |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 229 | return NULL; |
| 230 | |
| 231 | return btrfs_match_dir_item_name(root, path, name, name_len); |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 232 | } |
| 233 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 234 | /* |
| 235 | * lookup a directory item based on index. 'dir' is the objectid |
| 236 | * we're searching in, and 'mod' tells us if you plan on deleting the |
| 237 | * item (use mod < 0) or changing the options (use mod > 0) |
| 238 | * |
| 239 | * The name is used to make sure the index really points to the name you were |
| 240 | * looking for. |
| 241 | */ |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 242 | struct btrfs_dir_item * |
| 243 | btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans, |
| 244 | struct btrfs_root *root, |
| 245 | struct btrfs_path *path, u64 dir, |
| 246 | u64 objectid, const char *name, int name_len, |
| 247 | int mod) |
| 248 | { |
| 249 | int ret; |
| 250 | struct btrfs_key key; |
| 251 | int ins_len = mod < 0 ? -1 : 0; |
| 252 | int cow = mod != 0; |
| 253 | |
| 254 | key.objectid = dir; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 255 | btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY); |
| 256 | key.offset = objectid; |
| 257 | |
| 258 | ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); |
| 259 | if (ret < 0) |
| 260 | return ERR_PTR(ret); |
| 261 | if (ret > 0) |
| 262 | return ERR_PTR(-ENOENT); |
| 263 | return btrfs_match_dir_item_name(root, path, name, name_len); |
| 264 | } |
| 265 | |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 266 | struct btrfs_dir_item * |
| 267 | btrfs_search_dir_index_item(struct btrfs_root *root, |
| 268 | struct btrfs_path *path, u64 dirid, |
| 269 | const char *name, int name_len) |
| 270 | { |
| 271 | struct extent_buffer *leaf; |
| 272 | struct btrfs_dir_item *di; |
| 273 | struct btrfs_key key; |
| 274 | u32 nritems; |
| 275 | int ret; |
| 276 | |
| 277 | key.objectid = dirid; |
| 278 | key.type = BTRFS_DIR_INDEX_KEY; |
| 279 | key.offset = 0; |
| 280 | |
| 281 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 282 | if (ret < 0) |
| 283 | return ERR_PTR(ret); |
| 284 | |
| 285 | leaf = path->nodes[0]; |
| 286 | nritems = btrfs_header_nritems(leaf); |
| 287 | |
| 288 | while (1) { |
| 289 | if (path->slots[0] >= nritems) { |
| 290 | ret = btrfs_next_leaf(root, path); |
| 291 | if (ret < 0) |
| 292 | return ERR_PTR(ret); |
| 293 | if (ret > 0) |
| 294 | break; |
| 295 | leaf = path->nodes[0]; |
| 296 | nritems = btrfs_header_nritems(leaf); |
| 297 | continue; |
| 298 | } |
| 299 | |
| 300 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
| 301 | if (key.objectid != dirid || key.type != BTRFS_DIR_INDEX_KEY) |
| 302 | break; |
| 303 | |
| 304 | di = btrfs_match_dir_item_name(root, path, name, name_len); |
| 305 | if (di) |
| 306 | return di; |
| 307 | |
| 308 | path->slots[0]++; |
| 309 | } |
| 310 | return NULL; |
| 311 | } |
| 312 | |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 313 | struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans, |
| 314 | struct btrfs_root *root, |
| 315 | struct btrfs_path *path, u64 dir, |
| 316 | const char *name, u16 name_len, |
| 317 | int mod) |
| 318 | { |
| 319 | int ret; |
| 320 | struct btrfs_key key; |
| 321 | int ins_len = mod < 0 ? -1 : 0; |
| 322 | int cow = mod != 0; |
| 323 | struct btrfs_key found_key; |
| 324 | struct extent_buffer *leaf; |
| 325 | |
| 326 | key.objectid = dir; |
| 327 | btrfs_set_key_type(&key, BTRFS_XATTR_ITEM_KEY); |
David Miller | df68b8a | 2008-02-15 10:40:52 -0500 | [diff] [blame] | 328 | key.offset = btrfs_name_hash(name, name_len); |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 329 | ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); |
| 330 | if (ret < 0) |
| 331 | return ERR_PTR(ret); |
| 332 | if (ret > 0) { |
| 333 | if (path->slots[0] == 0) |
| 334 | return NULL; |
| 335 | path->slots[0]--; |
| 336 | } |
| 337 | |
| 338 | leaf = path->nodes[0]; |
| 339 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
| 340 | |
| 341 | if (found_key.objectid != dir || |
| 342 | btrfs_key_type(&found_key) != BTRFS_XATTR_ITEM_KEY || |
| 343 | found_key.offset != key.offset) |
| 344 | return NULL; |
| 345 | |
| 346 | return btrfs_match_dir_item_name(root, path, name, name_len); |
| 347 | } |
| 348 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 349 | /* |
| 350 | * helper function to look at the directory item pointed to by 'path' |
| 351 | * this walks through all the entries in a dir item and finds one |
| 352 | * for a specific name. |
| 353 | */ |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 354 | 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] | 355 | struct btrfs_path *path, |
| 356 | const char *name, int name_len) |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 357 | { |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 358 | struct btrfs_dir_item *dir_item; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 359 | unsigned long name_ptr; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 360 | u32 total_len; |
| 361 | u32 cur = 0; |
| 362 | u32 this_len; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 363 | struct extent_buffer *leaf; |
Chris Mason | a8a2ee0 | 2007-03-16 08:46:49 -0400 | [diff] [blame] | 364 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 365 | leaf = path->nodes[0]; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 366 | 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] | 367 | if (verify_dir_item(root, leaf, dir_item)) |
| 368 | return NULL; |
| 369 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 370 | total_len = btrfs_item_size_nr(leaf, path->slots[0]); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 371 | while (cur < total_len) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 372 | this_len = sizeof(*dir_item) + |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 373 | btrfs_dir_name_len(leaf, dir_item) + |
| 374 | btrfs_dir_data_len(leaf, dir_item); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 375 | name_ptr = (unsigned long)(dir_item + 1); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 376 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 377 | if (btrfs_dir_name_len(leaf, dir_item) == name_len && |
| 378 | memcmp_extent_buffer(leaf, name, name_ptr, name_len) == 0) |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 379 | return dir_item; |
| 380 | |
| 381 | cur += this_len; |
| 382 | dir_item = (struct btrfs_dir_item *)((char *)dir_item + |
| 383 | this_len); |
| 384 | } |
| 385 | return NULL; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 386 | } |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 387 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 388 | /* |
| 389 | * given a pointer into a directory item, delete it. This |
| 390 | * handles items that have more than one entry in them. |
| 391 | */ |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 392 | int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans, |
| 393 | struct btrfs_root *root, |
| 394 | struct btrfs_path *path, |
| 395 | struct btrfs_dir_item *di) |
| 396 | { |
| 397 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 398 | struct extent_buffer *leaf; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 399 | u32 sub_item_len; |
| 400 | u32 item_len; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 401 | int ret = 0; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 402 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 403 | leaf = path->nodes[0]; |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 404 | sub_item_len = sizeof(*di) + btrfs_dir_name_len(leaf, di) + |
| 405 | btrfs_dir_data_len(leaf, di); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 406 | item_len = btrfs_item_size_nr(leaf, path->slots[0]); |
| 407 | if (sub_item_len == item_len) { |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 408 | ret = btrfs_del_item(trans, root, path); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 409 | } else { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 410 | /* MARKER */ |
| 411 | unsigned long ptr = (unsigned long)di; |
| 412 | unsigned long start; |
| 413 | |
| 414 | start = btrfs_item_ptr_offset(leaf, path->slots[0]); |
| 415 | memmove_extent_buffer(leaf, ptr, ptr + sub_item_len, |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 416 | item_len - (ptr + sub_item_len - start)); |
| 417 | ret = btrfs_truncate_item(trans, root, path, |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 418 | item_len - sub_item_len, 1); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 419 | } |
Andi Kleen | 411fc6b | 2010-10-29 15:14:31 -0400 | [diff] [blame] | 420 | return ret; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 421 | } |
Josef Bacik | 22a94d4 | 2011-03-16 16:47:17 -0400 | [diff] [blame] | 422 | |
| 423 | int verify_dir_item(struct btrfs_root *root, |
| 424 | struct extent_buffer *leaf, |
| 425 | struct btrfs_dir_item *dir_item) |
| 426 | { |
| 427 | u16 namelen = BTRFS_NAME_LEN; |
| 428 | u8 type = btrfs_dir_type(leaf, dir_item); |
| 429 | |
| 430 | if (type >= BTRFS_FT_MAX) { |
| 431 | printk(KERN_CRIT "btrfs: invalid dir item type: %d\n", |
| 432 | (int)type); |
| 433 | return 1; |
| 434 | } |
| 435 | |
| 436 | if (type == BTRFS_FT_XATTR) |
| 437 | namelen = XATTR_NAME_MAX; |
| 438 | |
| 439 | if (btrfs_dir_name_len(leaf, dir_item) > namelen) { |
Sergei Trofimovich | 9694b3f | 2011-05-20 20:20:31 +0000 | [diff] [blame] | 440 | printk(KERN_CRIT "btrfs: invalid dir item name len: %u\n", |
Josef Bacik | 22a94d4 | 2011-03-16 16:47:17 -0400 | [diff] [blame] | 441 | (unsigned)btrfs_dir_data_len(leaf, dir_item)); |
| 442 | return 1; |
| 443 | } |
| 444 | |
| 445 | /* BTRFS_MAX_XATTR_SIZE is the same for all dir items */ |
| 446 | if (btrfs_dir_data_len(leaf, dir_item) > BTRFS_MAX_XATTR_SIZE(root)) { |
| 447 | printk(KERN_CRIT "btrfs: invalid dir item data len: %u\n", |
| 448 | (unsigned)btrfs_dir_data_len(leaf, dir_item)); |
| 449 | return 1; |
| 450 | } |
| 451 | |
| 452 | return 0; |
| 453 | } |