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); |
| 53 | WARN_ON(ret > 0); |
Chris Mason | 7fcde0e | 2007-04-05 12:13:21 -0400 | [diff] [blame] | 54 | } |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 55 | if (ret < 0) |
| 56 | return ERR_PTR(ret); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 57 | WARN_ON(ret > 0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 58 | leaf = path->nodes[0]; |
| 59 | item = btrfs_item_nr(leaf, path->slots[0]); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 60 | ptr = btrfs_item_ptr(leaf, path->slots[0], char); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 61 | BUG_ON(data_size > btrfs_item_size(leaf, item)); |
| 62 | ptr += btrfs_item_size(leaf, item) - data_size; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 63 | return (struct btrfs_dir_item *)ptr; |
Chris Mason | 7fcde0e | 2007-04-05 12:13:21 -0400 | [diff] [blame] | 64 | } |
| 65 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 66 | /* |
| 67 | * xattrs work a lot like directories, this inserts an xattr item |
| 68 | * into the tree |
| 69 | */ |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 70 | int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans, |
Yan, Zheng | f34f57a | 2009-11-12 09:35:27 +0000 | [diff] [blame] | 71 | struct btrfs_root *root, |
| 72 | struct btrfs_path *path, u64 objectid, |
| 73 | const char *name, u16 name_len, |
| 74 | const void *data, u16 data_len) |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 75 | { |
| 76 | int ret = 0; |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 77 | struct btrfs_dir_item *dir_item; |
| 78 | unsigned long name_ptr, data_ptr; |
| 79 | struct btrfs_key key, location; |
| 80 | struct btrfs_disk_key disk_key; |
| 81 | struct extent_buffer *leaf; |
| 82 | u32 data_size; |
| 83 | |
Yan, Zheng | f34f57a | 2009-11-12 09:35:27 +0000 | [diff] [blame] | 84 | BUG_ON(name_len + data_len > BTRFS_MAX_XATTR_SIZE(root)); |
| 85 | |
| 86 | key.objectid = objectid; |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 87 | btrfs_set_key_type(&key, BTRFS_XATTR_ITEM_KEY); |
David Miller | df68b8a | 2008-02-15 10:40:52 -0500 | [diff] [blame] | 88 | key.offset = btrfs_name_hash(name, name_len); |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 89 | |
| 90 | data_size = sizeof(*dir_item) + name_len + data_len; |
| 91 | dir_item = insert_with_overflow(trans, root, path, &key, data_size, |
| 92 | name, name_len); |
| 93 | /* |
| 94 | * FIXME: at some point we should handle xattr's that are larger than |
| 95 | * what we can fit in our leaf. We set location to NULL b/c we arent |
| 96 | * pointing at anything else, that will change if we store the xattr |
| 97 | * data in a separate inode. |
| 98 | */ |
| 99 | BUG_ON(IS_ERR(dir_item)); |
| 100 | memset(&location, 0, sizeof(location)); |
| 101 | |
| 102 | leaf = path->nodes[0]; |
| 103 | btrfs_cpu_key_to_disk(&disk_key, &location); |
| 104 | btrfs_set_dir_item_key(leaf, dir_item, &disk_key); |
| 105 | btrfs_set_dir_type(leaf, dir_item, BTRFS_FT_XATTR); |
| 106 | btrfs_set_dir_name_len(leaf, dir_item, name_len); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 107 | btrfs_set_dir_transid(leaf, dir_item, trans->transid); |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 108 | btrfs_set_dir_data_len(leaf, dir_item, data_len); |
| 109 | name_ptr = (unsigned long)(dir_item + 1); |
| 110 | data_ptr = (unsigned long)((char *)name_ptr + name_len); |
| 111 | |
| 112 | write_extent_buffer(leaf, name, name_ptr, name_len); |
| 113 | write_extent_buffer(leaf, data, data_ptr, data_len); |
| 114 | btrfs_mark_buffer_dirty(path->nodes[0]); |
| 115 | |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 116 | return ret; |
| 117 | } |
| 118 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 119 | /* |
| 120 | * insert a directory item in the tree, doing all the magic for |
| 121 | * both indexes. 'dir' indicates which objectid to insert it into, |
| 122 | * 'location' is the key to stuff into the directory item, 'type' is the |
| 123 | * type of the inode we're pointing to, and 'index' is the sequence number |
| 124 | * to use for the second index (if one is created). |
| 125 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 126 | int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 127 | *root, const char *name, int name_len, u64 dir, |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 128 | struct btrfs_key *location, 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 | |
| 140 | key.objectid = 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(); |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 145 | path->leave_spinning = 1; |
| 146 | |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 147 | data_size = sizeof(*dir_item) + name_len; |
Chris Mason | e06afa8 | 2007-05-23 15:44:28 -0400 | [diff] [blame] | 148 | dir_item = insert_with_overflow(trans, root, path, &key, data_size, |
| 149 | name, name_len); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 150 | if (IS_ERR(dir_item)) { |
| 151 | ret = PTR_ERR(dir_item); |
Chris Mason | e06afa8 | 2007-05-23 15:44:28 -0400 | [diff] [blame] | 152 | if (ret == -EEXIST) |
| 153 | goto second_insert; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 154 | goto out; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 155 | } |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 156 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 157 | leaf = path->nodes[0]; |
| 158 | btrfs_cpu_key_to_disk(&disk_key, location); |
| 159 | btrfs_set_dir_item_key(leaf, dir_item, &disk_key); |
| 160 | btrfs_set_dir_type(leaf, dir_item, type); |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 161 | btrfs_set_dir_data_len(leaf, dir_item, 0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 162 | btrfs_set_dir_name_len(leaf, dir_item, name_len); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 163 | btrfs_set_dir_transid(leaf, dir_item, trans->transid); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 164 | name_ptr = (unsigned long)(dir_item + 1); |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 165 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 166 | write_extent_buffer(leaf, name, name_ptr, name_len); |
| 167 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 168 | |
Chris Mason | e06afa8 | 2007-05-23 15:44:28 -0400 | [diff] [blame] | 169 | second_insert: |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 170 | /* FIXME, use some real flag for selecting the extra index */ |
| 171 | if (root == root->fs_info->tree_root) { |
| 172 | ret = 0; |
| 173 | goto out; |
| 174 | } |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 175 | btrfs_release_path(root, path); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 176 | |
| 177 | btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY); |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 178 | key.offset = index; |
Chris Mason | e06afa8 | 2007-05-23 15:44:28 -0400 | [diff] [blame] | 179 | dir_item = insert_with_overflow(trans, root, path, &key, data_size, |
| 180 | name, name_len); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 181 | if (IS_ERR(dir_item)) { |
Chris Mason | e06afa8 | 2007-05-23 15:44:28 -0400 | [diff] [blame] | 182 | ret2 = PTR_ERR(dir_item); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 183 | goto out; |
| 184 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 185 | leaf = path->nodes[0]; |
| 186 | btrfs_cpu_key_to_disk(&disk_key, location); |
| 187 | btrfs_set_dir_item_key(leaf, dir_item, &disk_key); |
| 188 | btrfs_set_dir_type(leaf, dir_item, type); |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 189 | btrfs_set_dir_data_len(leaf, dir_item, 0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 190 | btrfs_set_dir_name_len(leaf, dir_item, name_len); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 191 | btrfs_set_dir_transid(leaf, dir_item, trans->transid); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 192 | name_ptr = (unsigned long)(dir_item + 1); |
| 193 | write_extent_buffer(leaf, name, name_ptr, name_len); |
| 194 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 195 | out: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 196 | btrfs_free_path(path); |
Chris Mason | e06afa8 | 2007-05-23 15:44:28 -0400 | [diff] [blame] | 197 | if (ret) |
| 198 | return ret; |
| 199 | if (ret2) |
| 200 | return ret2; |
| 201 | return 0; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 202 | } |
| 203 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 204 | /* |
| 205 | * lookup a directory item based on name. 'dir' is the objectid |
| 206 | * we're searching in, and 'mod' tells us if you plan on deleting the |
| 207 | * item (use mod < 0) or changing the options (use mod > 0) |
| 208 | */ |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 209 | struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, |
| 210 | struct btrfs_root *root, |
| 211 | struct btrfs_path *path, u64 dir, |
| 212 | const char *name, int name_len, |
| 213 | int mod) |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 214 | { |
Chris Mason | 1d4f640 | 2007-03-15 15:18:43 -0400 | [diff] [blame] | 215 | int ret; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 216 | struct btrfs_key key; |
Chris Mason | 1d4f640 | 2007-03-15 15:18:43 -0400 | [diff] [blame] | 217 | int ins_len = mod < 0 ? -1 : 0; |
| 218 | int cow = mod != 0; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 219 | struct btrfs_key found_key; |
| 220 | struct extent_buffer *leaf; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 221 | |
| 222 | key.objectid = dir; |
Chris Mason | 1d4f640 | 2007-03-15 15:18:43 -0400 | [diff] [blame] | 223 | btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 224 | |
David Miller | df68b8a | 2008-02-15 10:40:52 -0500 | [diff] [blame] | 225 | key.offset = btrfs_name_hash(name, name_len); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 226 | |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 227 | ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); |
| 228 | if (ret < 0) |
| 229 | return ERR_PTR(ret); |
| 230 | if (ret > 0) { |
| 231 | if (path->slots[0] == 0) |
| 232 | return NULL; |
| 233 | path->slots[0]--; |
Chris Mason | 7fcde0e | 2007-04-05 12:13:21 -0400 | [diff] [blame] | 234 | } |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 235 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 236 | leaf = path->nodes[0]; |
| 237 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
| 238 | |
| 239 | if (found_key.objectid != dir || |
| 240 | btrfs_key_type(&found_key) != BTRFS_DIR_ITEM_KEY || |
| 241 | found_key.offset != key.offset) |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 242 | return NULL; |
| 243 | |
| 244 | return btrfs_match_dir_item_name(root, path, name, name_len); |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 245 | } |
| 246 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 247 | /* |
| 248 | * lookup a directory item based on index. 'dir' is the objectid |
| 249 | * we're searching in, and 'mod' tells us if you plan on deleting the |
| 250 | * item (use mod < 0) or changing the options (use mod > 0) |
| 251 | * |
| 252 | * The name is used to make sure the index really points to the name you were |
| 253 | * looking for. |
| 254 | */ |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 255 | struct btrfs_dir_item * |
| 256 | btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans, |
| 257 | struct btrfs_root *root, |
| 258 | struct btrfs_path *path, u64 dir, |
| 259 | u64 objectid, const char *name, int name_len, |
| 260 | int mod) |
| 261 | { |
| 262 | int ret; |
| 263 | struct btrfs_key key; |
| 264 | int ins_len = mod < 0 ? -1 : 0; |
| 265 | int cow = mod != 0; |
| 266 | |
| 267 | key.objectid = dir; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 268 | btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY); |
| 269 | key.offset = objectid; |
| 270 | |
| 271 | ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); |
| 272 | if (ret < 0) |
| 273 | return ERR_PTR(ret); |
| 274 | if (ret > 0) |
| 275 | return ERR_PTR(-ENOENT); |
| 276 | return btrfs_match_dir_item_name(root, path, name, name_len); |
| 277 | } |
| 278 | |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 279 | struct btrfs_dir_item * |
| 280 | btrfs_search_dir_index_item(struct btrfs_root *root, |
| 281 | struct btrfs_path *path, u64 dirid, |
| 282 | const char *name, int name_len) |
| 283 | { |
| 284 | struct extent_buffer *leaf; |
| 285 | struct btrfs_dir_item *di; |
| 286 | struct btrfs_key key; |
| 287 | u32 nritems; |
| 288 | int ret; |
| 289 | |
| 290 | key.objectid = dirid; |
| 291 | key.type = BTRFS_DIR_INDEX_KEY; |
| 292 | key.offset = 0; |
| 293 | |
| 294 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 295 | if (ret < 0) |
| 296 | return ERR_PTR(ret); |
| 297 | |
| 298 | leaf = path->nodes[0]; |
| 299 | nritems = btrfs_header_nritems(leaf); |
| 300 | |
| 301 | while (1) { |
| 302 | if (path->slots[0] >= nritems) { |
| 303 | ret = btrfs_next_leaf(root, path); |
| 304 | if (ret < 0) |
| 305 | return ERR_PTR(ret); |
| 306 | if (ret > 0) |
| 307 | break; |
| 308 | leaf = path->nodes[0]; |
| 309 | nritems = btrfs_header_nritems(leaf); |
| 310 | continue; |
| 311 | } |
| 312 | |
| 313 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
| 314 | if (key.objectid != dirid || key.type != BTRFS_DIR_INDEX_KEY) |
| 315 | break; |
| 316 | |
| 317 | di = btrfs_match_dir_item_name(root, path, name, name_len); |
| 318 | if (di) |
| 319 | return di; |
| 320 | |
| 321 | path->slots[0]++; |
| 322 | } |
| 323 | return NULL; |
| 324 | } |
| 325 | |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 326 | struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans, |
| 327 | struct btrfs_root *root, |
| 328 | struct btrfs_path *path, u64 dir, |
| 329 | const char *name, u16 name_len, |
| 330 | int mod) |
| 331 | { |
| 332 | int ret; |
| 333 | struct btrfs_key key; |
| 334 | int ins_len = mod < 0 ? -1 : 0; |
| 335 | int cow = mod != 0; |
| 336 | struct btrfs_key found_key; |
| 337 | struct extent_buffer *leaf; |
| 338 | |
| 339 | key.objectid = dir; |
| 340 | btrfs_set_key_type(&key, BTRFS_XATTR_ITEM_KEY); |
David Miller | df68b8a | 2008-02-15 10:40:52 -0500 | [diff] [blame] | 341 | key.offset = btrfs_name_hash(name, name_len); |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 342 | ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); |
| 343 | if (ret < 0) |
| 344 | return ERR_PTR(ret); |
| 345 | if (ret > 0) { |
| 346 | if (path->slots[0] == 0) |
| 347 | return NULL; |
| 348 | path->slots[0]--; |
| 349 | } |
| 350 | |
| 351 | leaf = path->nodes[0]; |
| 352 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
| 353 | |
| 354 | if (found_key.objectid != dir || |
| 355 | btrfs_key_type(&found_key) != BTRFS_XATTR_ITEM_KEY || |
| 356 | found_key.offset != key.offset) |
| 357 | return NULL; |
| 358 | |
| 359 | return btrfs_match_dir_item_name(root, path, name, name_len); |
| 360 | } |
| 361 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 362 | /* |
| 363 | * helper function to look at the directory item pointed to by 'path' |
| 364 | * this walks through all the entries in a dir item and finds one |
| 365 | * for a specific name. |
| 366 | */ |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 367 | 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] | 368 | struct btrfs_path *path, |
| 369 | const char *name, int name_len) |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 370 | { |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 371 | struct btrfs_dir_item *dir_item; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 372 | unsigned long name_ptr; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 373 | u32 total_len; |
| 374 | u32 cur = 0; |
| 375 | u32 this_len; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 376 | struct extent_buffer *leaf; |
Chris Mason | a8a2ee0 | 2007-03-16 08:46:49 -0400 | [diff] [blame] | 377 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 378 | leaf = path->nodes[0]; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 379 | dir_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dir_item); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 380 | total_len = btrfs_item_size_nr(leaf, path->slots[0]); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 381 | while (cur < total_len) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 382 | this_len = sizeof(*dir_item) + |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 383 | btrfs_dir_name_len(leaf, dir_item) + |
| 384 | btrfs_dir_data_len(leaf, dir_item); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 385 | name_ptr = (unsigned long)(dir_item + 1); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 386 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 387 | if (btrfs_dir_name_len(leaf, dir_item) == name_len && |
| 388 | memcmp_extent_buffer(leaf, name, name_ptr, name_len) == 0) |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 389 | return dir_item; |
| 390 | |
| 391 | cur += this_len; |
| 392 | dir_item = (struct btrfs_dir_item *)((char *)dir_item + |
| 393 | this_len); |
| 394 | } |
| 395 | return NULL; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 396 | } |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 397 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 398 | /* |
| 399 | * given a pointer into a directory item, delete it. This |
| 400 | * handles items that have more than one entry in them. |
| 401 | */ |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 402 | int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans, |
| 403 | struct btrfs_root *root, |
| 404 | struct btrfs_path *path, |
| 405 | struct btrfs_dir_item *di) |
| 406 | { |
| 407 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 408 | struct extent_buffer *leaf; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 409 | u32 sub_item_len; |
| 410 | u32 item_len; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 411 | int ret = 0; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 412 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 413 | leaf = path->nodes[0]; |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 414 | sub_item_len = sizeof(*di) + btrfs_dir_name_len(leaf, di) + |
| 415 | btrfs_dir_data_len(leaf, di); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 416 | item_len = btrfs_item_size_nr(leaf, path->slots[0]); |
| 417 | if (sub_item_len == item_len) { |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 418 | ret = btrfs_del_item(trans, root, path); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 419 | } else { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 420 | /* MARKER */ |
| 421 | unsigned long ptr = (unsigned long)di; |
| 422 | unsigned long start; |
| 423 | |
| 424 | start = btrfs_item_ptr_offset(leaf, path->slots[0]); |
| 425 | memmove_extent_buffer(leaf, ptr, ptr + sub_item_len, |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 426 | item_len - (ptr + sub_item_len - start)); |
| 427 | ret = btrfs_truncate_item(trans, root, path, |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 428 | item_len - sub_item_len, 1); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 429 | } |
| 430 | return 0; |
| 431 | } |