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 | { |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 41 | struct btrfs_fs_info *fs_info = root->fs_info; |
Chris Mason | 7fcde0e | 2007-04-05 12:13:21 -0400 | [diff] [blame] | 42 | int ret; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 43 | char *ptr; |
| 44 | struct btrfs_item *item; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 45 | struct extent_buffer *leaf; |
Chris Mason | 7fcde0e | 2007-04-05 12:13:21 -0400 | [diff] [blame] | 46 | |
| 47 | ret = btrfs_insert_empty_item(trans, root, path, cpu_key, data_size); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 48 | if (ret == -EEXIST) { |
Chris Mason | e06afa8 | 2007-05-23 15:44:28 -0400 | [diff] [blame] | 49 | struct btrfs_dir_item *di; |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 50 | di = btrfs_match_dir_item_name(fs_info, path, name, name_len); |
Chris Mason | e06afa8 | 2007-05-23 15:44:28 -0400 | [diff] [blame] | 51 | if (di) |
| 52 | return ERR_PTR(-EEXIST); |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 53 | btrfs_extend_item(fs_info, path, data_size); |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 54 | } else if (ret < 0) |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 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]; |
Ross Kirk | dd3cc16 | 2013-09-16 15:58:09 +0100 | [diff] [blame] | 58 | item = btrfs_item_nr(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 | |
David Sterba | b9d04c6 | 2017-02-17 19:42:43 +0100 | [diff] [blame] | 83 | if (name_len + data_len > BTRFS_MAX_XATTR_SIZE(root->fs_info)) |
| 84 | return -ENOSPC; |
Yan, Zheng | f34f57a | 2009-11-12 09:35:27 +0000 | [diff] [blame] | 85 | |
| 86 | key.objectid = objectid; |
David Sterba | 962a298 | 2014-06-04 18:41:45 +0200 | [diff] [blame] | 87 | key.type = 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); |
Josef Bacik | fa09200 | 2011-05-27 12:06:11 -0400 | [diff] [blame] | 93 | if (IS_ERR(dir_item)) |
| 94 | return PTR_ERR(dir_item); |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 95 | memset(&location, 0, sizeof(location)); |
| 96 | |
| 97 | leaf = path->nodes[0]; |
| 98 | btrfs_cpu_key_to_disk(&disk_key, &location); |
| 99 | btrfs_set_dir_item_key(leaf, dir_item, &disk_key); |
| 100 | btrfs_set_dir_type(leaf, dir_item, BTRFS_FT_XATTR); |
| 101 | btrfs_set_dir_name_len(leaf, dir_item, name_len); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 102 | btrfs_set_dir_transid(leaf, dir_item, trans->transid); |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 103 | btrfs_set_dir_data_len(leaf, dir_item, data_len); |
| 104 | name_ptr = (unsigned long)(dir_item + 1); |
| 105 | data_ptr = (unsigned long)((char *)name_ptr + name_len); |
| 106 | |
| 107 | write_extent_buffer(leaf, name, name_ptr, name_len); |
| 108 | write_extent_buffer(leaf, data, data_ptr, data_len); |
| 109 | btrfs_mark_buffer_dirty(path->nodes[0]); |
| 110 | |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 111 | return ret; |
| 112 | } |
| 113 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 114 | /* |
| 115 | * insert a directory item in the tree, doing all the magic for |
| 116 | * both indexes. 'dir' indicates which objectid to insert it into, |
| 117 | * 'location' is the key to stuff into the directory item, 'type' is the |
| 118 | * type of the inode we're pointing to, and 'index' is the sequence number |
| 119 | * to use for the second index (if one is created). |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 120 | * Will return 0 or -ENOMEM |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 121 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 122 | 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] | 123 | *root, const char *name, int name_len, |
Nikolay Borisov | 8e7611c | 2017-02-20 13:50:31 +0200 | [diff] [blame] | 124 | struct btrfs_inode *dir, struct btrfs_key *location, |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 125 | u8 type, u64 index) |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 126 | { |
| 127 | int ret = 0; |
Chris Mason | e06afa8 | 2007-05-23 15:44:28 -0400 | [diff] [blame] | 128 | int ret2 = 0; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 129 | struct btrfs_path *path; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 130 | struct btrfs_dir_item *dir_item; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 131 | struct extent_buffer *leaf; |
| 132 | unsigned long name_ptr; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 133 | struct btrfs_key key; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 134 | struct btrfs_disk_key disk_key; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 135 | u32 data_size; |
| 136 | |
Nikolay Borisov | 8e7611c | 2017-02-20 13:50:31 +0200 | [diff] [blame] | 137 | key.objectid = btrfs_ino(dir); |
David Sterba | 962a298 | 2014-06-04 18:41:45 +0200 | [diff] [blame] | 138 | key.type = BTRFS_DIR_ITEM_KEY; |
David Miller | df68b8a | 2008-02-15 10:40:52 -0500 | [diff] [blame] | 139 | key.offset = btrfs_name_hash(name, name_len); |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 140 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 141 | path = btrfs_alloc_path(); |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 142 | if (!path) |
| 143 | return -ENOMEM; |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 144 | path->leave_spinning = 1; |
| 145 | |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 146 | btrfs_cpu_key_to_disk(&disk_key, location); |
| 147 | |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 148 | data_size = sizeof(*dir_item) + name_len; |
Chris Mason | e06afa8 | 2007-05-23 15:44:28 -0400 | [diff] [blame] | 149 | dir_item = insert_with_overflow(trans, root, path, &key, data_size, |
| 150 | name, name_len); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 151 | if (IS_ERR(dir_item)) { |
| 152 | ret = PTR_ERR(dir_item); |
Chris Mason | e06afa8 | 2007-05-23 15:44:28 -0400 | [diff] [blame] | 153 | if (ret == -EEXIST) |
| 154 | goto second_insert; |
Tsutomu Itoh | c2db107 | 2011-03-01 06:48:31 +0000 | [diff] [blame] | 155 | goto out_free; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 156 | } |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 157 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 158 | leaf = path->nodes[0]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 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; |
Tsutomu Itoh | c2db107 | 2011-03-01 06:48:31 +0000 | [diff] [blame] | 173 | goto out_free; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 174 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 175 | btrfs_release_path(path); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 176 | |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 177 | ret2 = btrfs_insert_delayed_dir_index(trans, root->fs_info, name, |
Nikolay Borisov | 8e7611c | 2017-02-20 13:50:31 +0200 | [diff] [blame] | 178 | name_len, dir, &disk_key, type, index); |
Tsutomu Itoh | c2db107 | 2011-03-01 06:48:31 +0000 | [diff] [blame] | 179 | out_free: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 180 | btrfs_free_path(path); |
Chris Mason | e06afa8 | 2007-05-23 15:44:28 -0400 | [diff] [blame] | 181 | if (ret) |
| 182 | return ret; |
| 183 | if (ret2) |
| 184 | return ret2; |
| 185 | return 0; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 186 | } |
| 187 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 188 | /* |
| 189 | * lookup a directory item based on name. 'dir' is the objectid |
| 190 | * we're searching in, and 'mod' tells us if you plan on deleting the |
| 191 | * item (use mod < 0) or changing the options (use mod > 0) |
| 192 | */ |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 193 | struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, |
| 194 | struct btrfs_root *root, |
| 195 | struct btrfs_path *path, u64 dir, |
| 196 | const char *name, int name_len, |
| 197 | int mod) |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 198 | { |
Chris Mason | 1d4f640 | 2007-03-15 15:18:43 -0400 | [diff] [blame] | 199 | int ret; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 200 | struct btrfs_key key; |
Chris Mason | 1d4f640 | 2007-03-15 15:18:43 -0400 | [diff] [blame] | 201 | int ins_len = mod < 0 ? -1 : 0; |
| 202 | int cow = mod != 0; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 203 | |
| 204 | key.objectid = dir; |
David Sterba | 962a298 | 2014-06-04 18:41:45 +0200 | [diff] [blame] | 205 | key.type = BTRFS_DIR_ITEM_KEY; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 206 | |
David Miller | df68b8a | 2008-02-15 10:40:52 -0500 | [diff] [blame] | 207 | key.offset = btrfs_name_hash(name, name_len); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 208 | |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 209 | ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); |
| 210 | if (ret < 0) |
| 211 | return ERR_PTR(ret); |
Li Zefan | 85d85a7 | 2011-07-14 03:17:52 +0000 | [diff] [blame] | 212 | if (ret > 0) |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 213 | return NULL; |
| 214 | |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 215 | return btrfs_match_dir_item_name(root->fs_info, path, name, name_len); |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 216 | } |
| 217 | |
Chris Mason | 9c52057 | 2012-12-17 14:26:57 -0500 | [diff] [blame] | 218 | int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir, |
| 219 | const char *name, int name_len) |
| 220 | { |
| 221 | int ret; |
| 222 | struct btrfs_key key; |
| 223 | struct btrfs_dir_item *di; |
| 224 | int data_size; |
| 225 | struct extent_buffer *leaf; |
| 226 | int slot; |
| 227 | struct btrfs_path *path; |
| 228 | |
| 229 | |
| 230 | path = btrfs_alloc_path(); |
| 231 | if (!path) |
| 232 | return -ENOMEM; |
| 233 | |
| 234 | key.objectid = dir; |
David Sterba | 962a298 | 2014-06-04 18:41:45 +0200 | [diff] [blame] | 235 | key.type = BTRFS_DIR_ITEM_KEY; |
Chris Mason | 9c52057 | 2012-12-17 14:26:57 -0500 | [diff] [blame] | 236 | key.offset = btrfs_name_hash(name, name_len); |
| 237 | |
| 238 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 239 | |
| 240 | /* return back any errors */ |
| 241 | if (ret < 0) |
| 242 | goto out; |
| 243 | |
| 244 | /* nothing found, we're safe */ |
| 245 | if (ret > 0) { |
| 246 | ret = 0; |
| 247 | goto out; |
| 248 | } |
| 249 | |
| 250 | /* we found an item, look for our name in the item */ |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 251 | di = btrfs_match_dir_item_name(root->fs_info, path, name, name_len); |
Chris Mason | 9c52057 | 2012-12-17 14:26:57 -0500 | [diff] [blame] | 252 | if (di) { |
| 253 | /* our exact name was found */ |
| 254 | ret = -EEXIST; |
| 255 | goto out; |
| 256 | } |
| 257 | |
| 258 | /* |
| 259 | * see if there is room in the item to insert this |
| 260 | * name |
| 261 | */ |
Filipe David Borba Manana | 878f2d2 | 2013-11-27 16:06:16 +0000 | [diff] [blame] | 262 | data_size = sizeof(*di) + name_len; |
Chris Mason | 9c52057 | 2012-12-17 14:26:57 -0500 | [diff] [blame] | 263 | leaf = path->nodes[0]; |
| 264 | slot = path->slots[0]; |
| 265 | if (data_size + btrfs_item_size_nr(leaf, slot) + |
Jeff Mahoney | da17066 | 2016-06-15 09:22:56 -0400 | [diff] [blame] | 266 | sizeof(struct btrfs_item) > BTRFS_LEAF_DATA_SIZE(root->fs_info)) { |
Chris Mason | 9c52057 | 2012-12-17 14:26:57 -0500 | [diff] [blame] | 267 | ret = -EOVERFLOW; |
| 268 | } else { |
| 269 | /* plenty of insertion room */ |
| 270 | ret = 0; |
| 271 | } |
| 272 | out: |
| 273 | btrfs_free_path(path); |
| 274 | return ret; |
| 275 | } |
| 276 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 277 | /* |
| 278 | * lookup a directory item based on index. 'dir' is the objectid |
| 279 | * we're searching in, and 'mod' tells us if you plan on deleting the |
| 280 | * item (use mod < 0) or changing the options (use mod > 0) |
| 281 | * |
| 282 | * The name is used to make sure the index really points to the name you were |
| 283 | * looking for. |
| 284 | */ |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 285 | struct btrfs_dir_item * |
| 286 | btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans, |
| 287 | struct btrfs_root *root, |
| 288 | struct btrfs_path *path, u64 dir, |
| 289 | u64 objectid, const char *name, int name_len, |
| 290 | int mod) |
| 291 | { |
| 292 | int ret; |
| 293 | struct btrfs_key key; |
| 294 | int ins_len = mod < 0 ? -1 : 0; |
| 295 | int cow = mod != 0; |
| 296 | |
| 297 | key.objectid = dir; |
David Sterba | 962a298 | 2014-06-04 18:41:45 +0200 | [diff] [blame] | 298 | key.type = BTRFS_DIR_INDEX_KEY; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 299 | key.offset = objectid; |
| 300 | |
| 301 | ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); |
| 302 | if (ret < 0) |
| 303 | return ERR_PTR(ret); |
| 304 | if (ret > 0) |
| 305 | return ERR_PTR(-ENOENT); |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 306 | return btrfs_match_dir_item_name(root->fs_info, path, name, name_len); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 307 | } |
| 308 | |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 309 | struct btrfs_dir_item * |
| 310 | btrfs_search_dir_index_item(struct btrfs_root *root, |
| 311 | struct btrfs_path *path, u64 dirid, |
| 312 | const char *name, int name_len) |
| 313 | { |
| 314 | struct extent_buffer *leaf; |
| 315 | struct btrfs_dir_item *di; |
| 316 | struct btrfs_key key; |
| 317 | u32 nritems; |
| 318 | int ret; |
| 319 | |
| 320 | key.objectid = dirid; |
| 321 | key.type = BTRFS_DIR_INDEX_KEY; |
| 322 | key.offset = 0; |
| 323 | |
| 324 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 325 | if (ret < 0) |
| 326 | return ERR_PTR(ret); |
| 327 | |
| 328 | leaf = path->nodes[0]; |
| 329 | nritems = btrfs_header_nritems(leaf); |
| 330 | |
| 331 | while (1) { |
| 332 | if (path->slots[0] >= nritems) { |
| 333 | ret = btrfs_next_leaf(root, path); |
| 334 | if (ret < 0) |
| 335 | return ERR_PTR(ret); |
| 336 | if (ret > 0) |
| 337 | break; |
| 338 | leaf = path->nodes[0]; |
| 339 | nritems = btrfs_header_nritems(leaf); |
| 340 | continue; |
| 341 | } |
| 342 | |
| 343 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
| 344 | if (key.objectid != dirid || key.type != BTRFS_DIR_INDEX_KEY) |
| 345 | break; |
| 346 | |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 347 | di = btrfs_match_dir_item_name(root->fs_info, path, |
| 348 | name, name_len); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 349 | if (di) |
| 350 | return di; |
| 351 | |
| 352 | path->slots[0]++; |
| 353 | } |
| 354 | return NULL; |
| 355 | } |
| 356 | |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 357 | struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans, |
| 358 | struct btrfs_root *root, |
| 359 | struct btrfs_path *path, u64 dir, |
| 360 | const char *name, u16 name_len, |
| 361 | int mod) |
| 362 | { |
| 363 | int ret; |
| 364 | struct btrfs_key key; |
| 365 | int ins_len = mod < 0 ? -1 : 0; |
| 366 | int cow = mod != 0; |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 367 | |
| 368 | key.objectid = dir; |
David Sterba | 962a298 | 2014-06-04 18:41:45 +0200 | [diff] [blame] | 369 | key.type = BTRFS_XATTR_ITEM_KEY; |
David Miller | df68b8a | 2008-02-15 10:40:52 -0500 | [diff] [blame] | 370 | key.offset = btrfs_name_hash(name, name_len); |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 371 | ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); |
| 372 | if (ret < 0) |
| 373 | return ERR_PTR(ret); |
Li Zefan | 85d85a7 | 2011-07-14 03:17:52 +0000 | [diff] [blame] | 374 | if (ret > 0) |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 375 | return NULL; |
| 376 | |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 377 | return btrfs_match_dir_item_name(root->fs_info, path, name, name_len); |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 378 | } |
| 379 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 380 | /* |
| 381 | * helper function to look at the directory item pointed to by 'path' |
| 382 | * this walks through all the entries in a dir item and finds one |
| 383 | * for a specific name. |
| 384 | */ |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 385 | struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info, |
Filipe Manana | 5f5bc6b | 2014-11-09 08:38:39 +0000 | [diff] [blame] | 386 | struct btrfs_path *path, |
| 387 | const char *name, int name_len) |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 388 | { |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 389 | struct btrfs_dir_item *dir_item; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 390 | unsigned long name_ptr; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 391 | u32 total_len; |
| 392 | u32 cur = 0; |
| 393 | u32 this_len; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 394 | struct extent_buffer *leaf; |
Chris Mason | a8a2ee0 | 2007-03-16 08:46:49 -0400 | [diff] [blame] | 395 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 396 | leaf = path->nodes[0]; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 397 | dir_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dir_item); |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 398 | if (verify_dir_item(fs_info, leaf, dir_item)) |
Josef Bacik | 22a94d4 | 2011-03-16 16:47:17 -0400 | [diff] [blame] | 399 | return NULL; |
| 400 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 401 | total_len = btrfs_item_size_nr(leaf, path->slots[0]); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 402 | while (cur < total_len) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 403 | this_len = sizeof(*dir_item) + |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 404 | btrfs_dir_name_len(leaf, dir_item) + |
| 405 | btrfs_dir_data_len(leaf, dir_item); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 406 | name_ptr = (unsigned long)(dir_item + 1); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 407 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 408 | if (btrfs_dir_name_len(leaf, dir_item) == name_len && |
| 409 | memcmp_extent_buffer(leaf, name, name_ptr, name_len) == 0) |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 410 | return dir_item; |
| 411 | |
| 412 | cur += this_len; |
| 413 | dir_item = (struct btrfs_dir_item *)((char *)dir_item + |
| 414 | this_len); |
| 415 | } |
| 416 | return NULL; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 417 | } |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 418 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 419 | /* |
| 420 | * given a pointer into a directory item, delete it. This |
| 421 | * handles items that have more than one entry in them. |
| 422 | */ |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 423 | int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans, |
| 424 | struct btrfs_root *root, |
| 425 | struct btrfs_path *path, |
| 426 | struct btrfs_dir_item *di) |
| 427 | { |
| 428 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 429 | struct extent_buffer *leaf; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 430 | u32 sub_item_len; |
| 431 | u32 item_len; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 432 | int ret = 0; |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 433 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 434 | leaf = path->nodes[0]; |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 435 | sub_item_len = sizeof(*di) + btrfs_dir_name_len(leaf, di) + |
| 436 | btrfs_dir_data_len(leaf, di); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 437 | item_len = btrfs_item_size_nr(leaf, path->slots[0]); |
| 438 | if (sub_item_len == item_len) { |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 439 | ret = btrfs_del_item(trans, root, path); |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 440 | } else { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 441 | /* MARKER */ |
| 442 | unsigned long ptr = (unsigned long)di; |
| 443 | unsigned long start; |
| 444 | |
| 445 | start = btrfs_item_ptr_offset(leaf, path->slots[0]); |
| 446 | memmove_extent_buffer(leaf, ptr, ptr + sub_item_len, |
Chris Mason | 7e38180 | 2007-04-19 15:36:27 -0400 | [diff] [blame] | 447 | item_len - (ptr + sub_item_len - start)); |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 448 | btrfs_truncate_item(root->fs_info, path, |
| 449 | 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 | |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 454 | int verify_dir_item(struct btrfs_fs_info *fs_info, |
Josef Bacik | 22a94d4 | 2011-03-16 16:47:17 -0400 | [diff] [blame] | 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) { |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 462 | btrfs_crit(fs_info, "invalid dir item type: %d", (int)type); |
Josef Bacik | 22a94d4 | 2011-03-16 16:47:17 -0400 | [diff] [blame] | 463 | return 1; |
| 464 | } |
| 465 | |
| 466 | if (type == BTRFS_FT_XATTR) |
| 467 | namelen = XATTR_NAME_MAX; |
| 468 | |
| 469 | if (btrfs_dir_name_len(leaf, dir_item) > namelen) { |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 470 | btrfs_crit(fs_info, "invalid dir item name len: %u", |
Josef Bacik | 22a94d4 | 2011-03-16 16:47:17 -0400 | [diff] [blame] | 471 | (unsigned)btrfs_dir_data_len(leaf, dir_item)); |
| 472 | return 1; |
| 473 | } |
| 474 | |
| 475 | /* BTRFS_MAX_XATTR_SIZE is the same for all dir items */ |
Filipe David Borba Manana | e46f538 | 2013-10-28 16:28:30 +0000 | [diff] [blame] | 476 | if ((btrfs_dir_data_len(leaf, dir_item) + |
Jeff Mahoney | 0b246af | 2016-06-22 18:54:23 -0400 | [diff] [blame] | 477 | btrfs_dir_name_len(leaf, dir_item)) > |
| 478 | BTRFS_MAX_XATTR_SIZE(fs_info)) { |
| 479 | btrfs_crit(fs_info, "invalid dir item name + data len: %u + %u", |
Jeff Mahoney | 5d163e0 | 2016-09-20 10:05:00 -0400 | [diff] [blame] | 480 | (unsigned)btrfs_dir_name_len(leaf, dir_item), |
| 481 | (unsigned)btrfs_dir_data_len(leaf, dir_item)); |
Josef Bacik | 22a94d4 | 2011-03-16 16:47:17 -0400 | [diff] [blame] | 482 | return 1; |
| 483 | } |
| 484 | |
| 485 | return 0; |
| 486 | } |