16cbd5570SChris Mason /* 26cbd5570SChris Mason * Copyright (C) 2007 Oracle. All rights reserved. 36cbd5570SChris Mason * 46cbd5570SChris Mason * This program is free software; you can redistribute it and/or 56cbd5570SChris Mason * modify it under the terms of the GNU General Public 66cbd5570SChris Mason * License v2 as published by the Free Software Foundation. 76cbd5570SChris Mason * 86cbd5570SChris Mason * This program is distributed in the hope that it will be useful, 96cbd5570SChris Mason * but WITHOUT ANY WARRANTY; without even the implied warranty of 106cbd5570SChris Mason * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 116cbd5570SChris Mason * General Public License for more details. 126cbd5570SChris Mason * 136cbd5570SChris Mason * You should have received a copy of the GNU General Public 146cbd5570SChris Mason * License along with this program; if not, write to the 156cbd5570SChris Mason * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 166cbd5570SChris Mason * Boston, MA 021110-1307, USA. 176cbd5570SChris Mason */ 186cbd5570SChris Mason 1962e2749eSChris Mason #include "ctree.h" 2062e2749eSChris Mason #include "disk-io.h" 2162e2749eSChris Mason #include "hash.h" 22e089f05cSChris Mason #include "transaction.h" 2362e2749eSChris Mason 24d352ac68SChris Mason /* 25d352ac68SChris Mason * insert a name into a directory, doing overflow properly if there is a hash 26d352ac68SChris Mason * collision. data_size indicates how big the item inserted should be. On 27d352ac68SChris Mason * success a struct btrfs_dir_item pointer is returned, otherwise it is 28d352ac68SChris Mason * an ERR_PTR. 29d352ac68SChris Mason * 30d352ac68SChris Mason * The name is not copied into the dir item, you have to do that yourself. 31d352ac68SChris Mason */ 3235b7e476SChris Mason static struct btrfs_dir_item *insert_with_overflow(struct btrfs_trans_handle 3335b7e476SChris Mason *trans, 347e38180eSChris Mason struct btrfs_root *root, 357e38180eSChris Mason struct btrfs_path *path, 367e38180eSChris Mason struct btrfs_key *cpu_key, 37e06afa83SChris Mason u32 data_size, 38e06afa83SChris Mason const char *name, 39e06afa83SChris Mason int name_len) 407fcde0e3SChris Mason { 417fcde0e3SChris Mason int ret; 427e38180eSChris Mason char *ptr; 437e38180eSChris Mason struct btrfs_item *item; 445f39d397SChris Mason struct extent_buffer *leaf; 457fcde0e3SChris Mason 467fcde0e3SChris Mason ret = btrfs_insert_empty_item(trans, root, path, cpu_key, data_size); 477e38180eSChris Mason if (ret == -EEXIST) { 48e06afa83SChris Mason struct btrfs_dir_item *di; 49e06afa83SChris Mason di = btrfs_match_dir_item_name(root, path, name, name_len); 50e06afa83SChris Mason if (di) 51e06afa83SChris Mason return ERR_PTR(-EEXIST); 527e38180eSChris Mason ret = btrfs_extend_item(trans, root, path, data_size); 537fcde0e3SChris Mason } 5454aa1f4dSChris Mason if (ret < 0) 5554aa1f4dSChris Mason return ERR_PTR(ret); 567e38180eSChris Mason WARN_ON(ret > 0); 575f39d397SChris Mason leaf = path->nodes[0]; 585f39d397SChris Mason item = btrfs_item_nr(leaf, path->slots[0]); 597e38180eSChris Mason ptr = btrfs_item_ptr(leaf, path->slots[0], char); 605f39d397SChris Mason BUG_ON(data_size > btrfs_item_size(leaf, item)); 615f39d397SChris Mason ptr += btrfs_item_size(leaf, item) - data_size; 627e38180eSChris Mason return (struct btrfs_dir_item *)ptr; 637fcde0e3SChris Mason } 647fcde0e3SChris Mason 65d352ac68SChris Mason /* 66d352ac68SChris Mason * xattrs work a lot like directories, this inserts an xattr item 67d352ac68SChris Mason * into the tree 68d352ac68SChris Mason */ 695103e947SJosef Bacik int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans, 70f34f57a3SYan, Zheng struct btrfs_root *root, 71f34f57a3SYan, Zheng struct btrfs_path *path, u64 objectid, 72f34f57a3SYan, Zheng const char *name, u16 name_len, 73f34f57a3SYan, Zheng const void *data, u16 data_len) 745103e947SJosef Bacik { 755103e947SJosef Bacik int ret = 0; 765103e947SJosef Bacik struct btrfs_dir_item *dir_item; 775103e947SJosef Bacik unsigned long name_ptr, data_ptr; 785103e947SJosef Bacik struct btrfs_key key, location; 795103e947SJosef Bacik struct btrfs_disk_key disk_key; 805103e947SJosef Bacik struct extent_buffer *leaf; 815103e947SJosef Bacik u32 data_size; 825103e947SJosef Bacik 83f34f57a3SYan, Zheng BUG_ON(name_len + data_len > BTRFS_MAX_XATTR_SIZE(root)); 84f34f57a3SYan, Zheng 85f34f57a3SYan, Zheng key.objectid = objectid; 865103e947SJosef Bacik btrfs_set_key_type(&key, BTRFS_XATTR_ITEM_KEY); 87df68b8a7SDavid Miller key.offset = btrfs_name_hash(name, name_len); 885103e947SJosef Bacik 895103e947SJosef Bacik data_size = sizeof(*dir_item) + name_len + data_len; 905103e947SJosef Bacik dir_item = insert_with_overflow(trans, root, path, &key, data_size, 915103e947SJosef Bacik name, name_len); 92fa09200bSJosef Bacik if (IS_ERR(dir_item)) 93fa09200bSJosef Bacik return PTR_ERR(dir_item); 945103e947SJosef Bacik memset(&location, 0, sizeof(location)); 955103e947SJosef Bacik 965103e947SJosef Bacik leaf = path->nodes[0]; 975103e947SJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &location); 985103e947SJosef Bacik btrfs_set_dir_item_key(leaf, dir_item, &disk_key); 995103e947SJosef Bacik btrfs_set_dir_type(leaf, dir_item, BTRFS_FT_XATTR); 1005103e947SJosef Bacik btrfs_set_dir_name_len(leaf, dir_item, name_len); 101e02119d5SChris Mason btrfs_set_dir_transid(leaf, dir_item, trans->transid); 1025103e947SJosef Bacik btrfs_set_dir_data_len(leaf, dir_item, data_len); 1035103e947SJosef Bacik name_ptr = (unsigned long)(dir_item + 1); 1045103e947SJosef Bacik data_ptr = (unsigned long)((char *)name_ptr + name_len); 1055103e947SJosef Bacik 1065103e947SJosef Bacik write_extent_buffer(leaf, name, name_ptr, name_len); 1075103e947SJosef Bacik write_extent_buffer(leaf, data, data_ptr, data_len); 1085103e947SJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 1095103e947SJosef Bacik 1105103e947SJosef Bacik return ret; 1115103e947SJosef Bacik } 1125103e947SJosef Bacik 113d352ac68SChris Mason /* 114d352ac68SChris Mason * insert a directory item in the tree, doing all the magic for 115d352ac68SChris Mason * both indexes. 'dir' indicates which objectid to insert it into, 116d352ac68SChris Mason * 'location' is the key to stuff into the directory item, 'type' is the 117d352ac68SChris Mason * type of the inode we're pointing to, and 'index' is the sequence number 118d352ac68SChris Mason * to use for the second index (if one is created). 119d352ac68SChris Mason */ 120e089f05cSChris Mason int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root 12116cdcec7SMiao Xie *root, const char *name, int name_len, 12216cdcec7SMiao Xie struct inode *dir, struct btrfs_key *location, 12316cdcec7SMiao Xie u8 type, u64 index) 12462e2749eSChris Mason { 12562e2749eSChris Mason int ret = 0; 126e06afa83SChris Mason int ret2 = 0; 1275caf2a00SChris Mason struct btrfs_path *path; 12862e2749eSChris Mason struct btrfs_dir_item *dir_item; 1295f39d397SChris Mason struct extent_buffer *leaf; 1305f39d397SChris Mason unsigned long name_ptr; 13162e2749eSChris Mason struct btrfs_key key; 1325f39d397SChris Mason struct btrfs_disk_key disk_key; 13362e2749eSChris Mason u32 data_size; 13462e2749eSChris Mason 1350d0ca30fSChris Mason key.objectid = btrfs_ino(dir); 1361d4f6404SChris Mason btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY); 137df68b8a7SDavid Miller key.offset = btrfs_name_hash(name, name_len); 138b9473439SChris Mason 1395caf2a00SChris Mason path = btrfs_alloc_path(); 14016cdcec7SMiao Xie if (!path) 14116cdcec7SMiao Xie return -ENOMEM; 142b9473439SChris Mason path->leave_spinning = 1; 143b9473439SChris Mason 14416cdcec7SMiao Xie btrfs_cpu_key_to_disk(&disk_key, location); 14516cdcec7SMiao Xie 14662e2749eSChris Mason data_size = sizeof(*dir_item) + name_len; 147e06afa83SChris Mason dir_item = insert_with_overflow(trans, root, path, &key, data_size, 148e06afa83SChris Mason name, name_len); 1497e38180eSChris Mason if (IS_ERR(dir_item)) { 1507e38180eSChris Mason ret = PTR_ERR(dir_item); 151e06afa83SChris Mason if (ret == -EEXIST) 152e06afa83SChris Mason goto second_insert; 153c2db1073STsutomu Itoh goto out_free; 1547e38180eSChris Mason } 15562e2749eSChris Mason 1565f39d397SChris Mason leaf = path->nodes[0]; 1575f39d397SChris Mason btrfs_set_dir_item_key(leaf, dir_item, &disk_key); 1585f39d397SChris Mason btrfs_set_dir_type(leaf, dir_item, type); 1595103e947SJosef Bacik btrfs_set_dir_data_len(leaf, dir_item, 0); 1605f39d397SChris Mason btrfs_set_dir_name_len(leaf, dir_item, name_len); 161e02119d5SChris Mason btrfs_set_dir_transid(leaf, dir_item, trans->transid); 1625f39d397SChris Mason name_ptr = (unsigned long)(dir_item + 1); 163c5739bbaSChris Mason 1645f39d397SChris Mason write_extent_buffer(leaf, name, name_ptr, name_len); 1655f39d397SChris Mason btrfs_mark_buffer_dirty(leaf); 1667e38180eSChris Mason 167e06afa83SChris Mason second_insert: 1687e38180eSChris Mason /* FIXME, use some real flag for selecting the extra index */ 1697e38180eSChris Mason if (root == root->fs_info->tree_root) { 1707e38180eSChris Mason ret = 0; 171c2db1073STsutomu Itoh goto out_free; 1727e38180eSChris Mason } 173b3b4aa74SDavid Sterba btrfs_release_path(path); 1747e38180eSChris Mason 17516cdcec7SMiao Xie ret2 = btrfs_insert_delayed_dir_index(trans, root, name, name_len, dir, 17616cdcec7SMiao Xie &disk_key, type, index); 177c2db1073STsutomu Itoh out_free: 1785caf2a00SChris Mason btrfs_free_path(path); 179e06afa83SChris Mason if (ret) 18062e2749eSChris Mason return ret; 181e06afa83SChris Mason if (ret2) 182e06afa83SChris Mason return ret2; 183e06afa83SChris Mason return 0; 18462e2749eSChris Mason } 18562e2749eSChris Mason 186d352ac68SChris Mason /* 187d352ac68SChris Mason * lookup a directory item based on name. 'dir' is the objectid 188d352ac68SChris Mason * we're searching in, and 'mod' tells us if you plan on deleting the 189d352ac68SChris Mason * item (use mod < 0) or changing the options (use mod > 0) 190d352ac68SChris Mason */ 1917e38180eSChris Mason struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, 1927e38180eSChris Mason struct btrfs_root *root, 1937e38180eSChris Mason struct btrfs_path *path, u64 dir, 1947e38180eSChris Mason const char *name, int name_len, 1957e38180eSChris Mason int mod) 19662e2749eSChris Mason { 1971d4f6404SChris Mason int ret; 19862e2749eSChris Mason struct btrfs_key key; 1991d4f6404SChris Mason int ins_len = mod < 0 ? -1 : 0; 2001d4f6404SChris Mason int cow = mod != 0; 2015f39d397SChris Mason struct btrfs_key found_key; 2025f39d397SChris Mason struct extent_buffer *leaf; 20362e2749eSChris Mason 20462e2749eSChris Mason key.objectid = dir; 2051d4f6404SChris Mason btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY); 2065f39d397SChris Mason 207df68b8a7SDavid Miller key.offset = btrfs_name_hash(name, name_len); 2085f39d397SChris Mason 209e089f05cSChris Mason ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); 2107fcde0e3SChris Mason if (ret < 0) 2117e38180eSChris Mason return ERR_PTR(ret); 2127fcde0e3SChris Mason if (ret > 0) { 2137fcde0e3SChris Mason if (path->slots[0] == 0) 2147e38180eSChris Mason return NULL; 2157fcde0e3SChris Mason path->slots[0]--; 2167fcde0e3SChris Mason } 2177fcde0e3SChris Mason 2185f39d397SChris Mason leaf = path->nodes[0]; 2195f39d397SChris Mason btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); 2205f39d397SChris Mason 2215f39d397SChris Mason if (found_key.objectid != dir || 2225f39d397SChris Mason btrfs_key_type(&found_key) != BTRFS_DIR_ITEM_KEY || 2235f39d397SChris Mason found_key.offset != key.offset) 2247e38180eSChris Mason return NULL; 2257fcde0e3SChris Mason 2267e38180eSChris Mason return btrfs_match_dir_item_name(root, path, name, name_len); 22762e2749eSChris Mason } 22862e2749eSChris Mason 229d352ac68SChris Mason /* 230d352ac68SChris Mason * lookup a directory item based on index. 'dir' is the objectid 231d352ac68SChris Mason * we're searching in, and 'mod' tells us if you plan on deleting the 232d352ac68SChris Mason * item (use mod < 0) or changing the options (use mod > 0) 233d352ac68SChris Mason * 234d352ac68SChris Mason * The name is used to make sure the index really points to the name you were 235d352ac68SChris Mason * looking for. 236d352ac68SChris Mason */ 2377e38180eSChris Mason struct btrfs_dir_item * 2387e38180eSChris Mason btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans, 2397e38180eSChris Mason struct btrfs_root *root, 2407e38180eSChris Mason struct btrfs_path *path, u64 dir, 2417e38180eSChris Mason u64 objectid, const char *name, int name_len, 2427e38180eSChris Mason int mod) 2437e38180eSChris Mason { 2447e38180eSChris Mason int ret; 2457e38180eSChris Mason struct btrfs_key key; 2467e38180eSChris Mason int ins_len = mod < 0 ? -1 : 0; 2477e38180eSChris Mason int cow = mod != 0; 2487e38180eSChris Mason 2497e38180eSChris Mason key.objectid = dir; 2507e38180eSChris Mason btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY); 2517e38180eSChris Mason key.offset = objectid; 2527e38180eSChris Mason 2537e38180eSChris Mason ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); 2547e38180eSChris Mason if (ret < 0) 2557e38180eSChris Mason return ERR_PTR(ret); 2567e38180eSChris Mason if (ret > 0) 2577e38180eSChris Mason return ERR_PTR(-ENOENT); 2587e38180eSChris Mason return btrfs_match_dir_item_name(root, path, name, name_len); 2597e38180eSChris Mason } 2607e38180eSChris Mason 2614df27c4dSYan, Zheng struct btrfs_dir_item * 2624df27c4dSYan, Zheng btrfs_search_dir_index_item(struct btrfs_root *root, 2634df27c4dSYan, Zheng struct btrfs_path *path, u64 dirid, 2644df27c4dSYan, Zheng const char *name, int name_len) 2654df27c4dSYan, Zheng { 2664df27c4dSYan, Zheng struct extent_buffer *leaf; 2674df27c4dSYan, Zheng struct btrfs_dir_item *di; 2684df27c4dSYan, Zheng struct btrfs_key key; 2694df27c4dSYan, Zheng u32 nritems; 2704df27c4dSYan, Zheng int ret; 2714df27c4dSYan, Zheng 2724df27c4dSYan, Zheng key.objectid = dirid; 2734df27c4dSYan, Zheng key.type = BTRFS_DIR_INDEX_KEY; 2744df27c4dSYan, Zheng key.offset = 0; 2754df27c4dSYan, Zheng 2764df27c4dSYan, Zheng ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 2774df27c4dSYan, Zheng if (ret < 0) 2784df27c4dSYan, Zheng return ERR_PTR(ret); 2794df27c4dSYan, Zheng 2804df27c4dSYan, Zheng leaf = path->nodes[0]; 2814df27c4dSYan, Zheng nritems = btrfs_header_nritems(leaf); 2824df27c4dSYan, Zheng 2834df27c4dSYan, Zheng while (1) { 2844df27c4dSYan, Zheng if (path->slots[0] >= nritems) { 2854df27c4dSYan, Zheng ret = btrfs_next_leaf(root, path); 2864df27c4dSYan, Zheng if (ret < 0) 2874df27c4dSYan, Zheng return ERR_PTR(ret); 2884df27c4dSYan, Zheng if (ret > 0) 2894df27c4dSYan, Zheng break; 2904df27c4dSYan, Zheng leaf = path->nodes[0]; 2914df27c4dSYan, Zheng nritems = btrfs_header_nritems(leaf); 2924df27c4dSYan, Zheng continue; 2934df27c4dSYan, Zheng } 2944df27c4dSYan, Zheng 2954df27c4dSYan, Zheng btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); 2964df27c4dSYan, Zheng if (key.objectid != dirid || key.type != BTRFS_DIR_INDEX_KEY) 2974df27c4dSYan, Zheng break; 2984df27c4dSYan, Zheng 2994df27c4dSYan, Zheng di = btrfs_match_dir_item_name(root, path, name, name_len); 3004df27c4dSYan, Zheng if (di) 3014df27c4dSYan, Zheng return di; 3024df27c4dSYan, Zheng 3034df27c4dSYan, Zheng path->slots[0]++; 3044df27c4dSYan, Zheng } 3054df27c4dSYan, Zheng return NULL; 3064df27c4dSYan, Zheng } 3074df27c4dSYan, Zheng 3085103e947SJosef Bacik struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans, 3095103e947SJosef Bacik struct btrfs_root *root, 3105103e947SJosef Bacik struct btrfs_path *path, u64 dir, 3115103e947SJosef Bacik const char *name, u16 name_len, 3125103e947SJosef Bacik int mod) 3135103e947SJosef Bacik { 3145103e947SJosef Bacik int ret; 3155103e947SJosef Bacik struct btrfs_key key; 3165103e947SJosef Bacik int ins_len = mod < 0 ? -1 : 0; 3175103e947SJosef Bacik int cow = mod != 0; 3185103e947SJosef Bacik struct btrfs_key found_key; 3195103e947SJosef Bacik struct extent_buffer *leaf; 3205103e947SJosef Bacik 3215103e947SJosef Bacik key.objectid = dir; 3225103e947SJosef Bacik btrfs_set_key_type(&key, BTRFS_XATTR_ITEM_KEY); 323df68b8a7SDavid Miller key.offset = btrfs_name_hash(name, name_len); 3245103e947SJosef Bacik ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); 3255103e947SJosef Bacik if (ret < 0) 3265103e947SJosef Bacik return ERR_PTR(ret); 3275103e947SJosef Bacik if (ret > 0) { 3285103e947SJosef Bacik if (path->slots[0] == 0) 3295103e947SJosef Bacik return NULL; 3305103e947SJosef Bacik path->slots[0]--; 3315103e947SJosef Bacik } 3325103e947SJosef Bacik 3335103e947SJosef Bacik leaf = path->nodes[0]; 3345103e947SJosef Bacik btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); 3355103e947SJosef Bacik 3365103e947SJosef Bacik if (found_key.objectid != dir || 3375103e947SJosef Bacik btrfs_key_type(&found_key) != BTRFS_XATTR_ITEM_KEY || 3385103e947SJosef Bacik found_key.offset != key.offset) 3395103e947SJosef Bacik return NULL; 3405103e947SJosef Bacik 3415103e947SJosef Bacik return btrfs_match_dir_item_name(root, path, name, name_len); 3425103e947SJosef Bacik } 3435103e947SJosef Bacik 344d352ac68SChris Mason /* 345d352ac68SChris Mason * helper function to look at the directory item pointed to by 'path' 346d352ac68SChris Mason * this walks through all the entries in a dir item and finds one 347d352ac68SChris Mason * for a specific name. 348d352ac68SChris Mason */ 3497e38180eSChris Mason struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root, 3507f5c1516SChris Mason struct btrfs_path *path, 3517f5c1516SChris Mason const char *name, int name_len) 35262e2749eSChris Mason { 35362e2749eSChris Mason struct btrfs_dir_item *dir_item; 3545f39d397SChris Mason unsigned long name_ptr; 3557e38180eSChris Mason u32 total_len; 3567e38180eSChris Mason u32 cur = 0; 3577e38180eSChris Mason u32 this_len; 3585f39d397SChris Mason struct extent_buffer *leaf; 359a8a2ee0cSChris Mason 3605f39d397SChris Mason leaf = path->nodes[0]; 3617e38180eSChris Mason dir_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dir_item); 36222a94d44SJosef Bacik if (verify_dir_item(root, leaf, dir_item)) 36322a94d44SJosef Bacik return NULL; 36422a94d44SJosef Bacik 3655f39d397SChris Mason total_len = btrfs_item_size_nr(leaf, path->slots[0]); 3667e38180eSChris Mason while (cur < total_len) { 3675f39d397SChris Mason this_len = sizeof(*dir_item) + 3685103e947SJosef Bacik btrfs_dir_name_len(leaf, dir_item) + 3695103e947SJosef Bacik btrfs_dir_data_len(leaf, dir_item); 3705f39d397SChris Mason name_ptr = (unsigned long)(dir_item + 1); 3717e38180eSChris Mason 3725f39d397SChris Mason if (btrfs_dir_name_len(leaf, dir_item) == name_len && 3735f39d397SChris Mason memcmp_extent_buffer(leaf, name, name_ptr, name_len) == 0) 3747e38180eSChris Mason return dir_item; 3757e38180eSChris Mason 3767e38180eSChris Mason cur += this_len; 3777e38180eSChris Mason dir_item = (struct btrfs_dir_item *)((char *)dir_item + 3787e38180eSChris Mason this_len); 37962e2749eSChris Mason } 3807e38180eSChris Mason return NULL; 3817e38180eSChris Mason } 3827e38180eSChris Mason 383d352ac68SChris Mason /* 384d352ac68SChris Mason * given a pointer into a directory item, delete it. This 385d352ac68SChris Mason * handles items that have more than one entry in them. 386d352ac68SChris Mason */ 3877e38180eSChris Mason int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans, 3887e38180eSChris Mason struct btrfs_root *root, 3897e38180eSChris Mason struct btrfs_path *path, 3907e38180eSChris Mason struct btrfs_dir_item *di) 3917e38180eSChris Mason { 3927e38180eSChris Mason 3935f39d397SChris Mason struct extent_buffer *leaf; 3947e38180eSChris Mason u32 sub_item_len; 3957e38180eSChris Mason u32 item_len; 39654aa1f4dSChris Mason int ret = 0; 3977e38180eSChris Mason 3985f39d397SChris Mason leaf = path->nodes[0]; 3995103e947SJosef Bacik sub_item_len = sizeof(*di) + btrfs_dir_name_len(leaf, di) + 4005103e947SJosef Bacik btrfs_dir_data_len(leaf, di); 4015f39d397SChris Mason item_len = btrfs_item_size_nr(leaf, path->slots[0]); 4025f39d397SChris Mason if (sub_item_len == item_len) { 4037e38180eSChris Mason ret = btrfs_del_item(trans, root, path); 4047e38180eSChris Mason } else { 4055f39d397SChris Mason /* MARKER */ 4065f39d397SChris Mason unsigned long ptr = (unsigned long)di; 4075f39d397SChris Mason unsigned long start; 4085f39d397SChris Mason 4095f39d397SChris Mason start = btrfs_item_ptr_offset(leaf, path->slots[0]); 4105f39d397SChris Mason memmove_extent_buffer(leaf, ptr, ptr + sub_item_len, 4117e38180eSChris Mason item_len - (ptr + sub_item_len - start)); 4127e38180eSChris Mason ret = btrfs_truncate_item(trans, root, path, 413179e29e4SChris Mason item_len - sub_item_len, 1); 4147e38180eSChris Mason } 415411fc6bcSAndi Kleen return ret; 4167e38180eSChris Mason } 41722a94d44SJosef Bacik 41822a94d44SJosef Bacik int verify_dir_item(struct btrfs_root *root, 41922a94d44SJosef Bacik struct extent_buffer *leaf, 42022a94d44SJosef Bacik struct btrfs_dir_item *dir_item) 42122a94d44SJosef Bacik { 42222a94d44SJosef Bacik u16 namelen = BTRFS_NAME_LEN; 42322a94d44SJosef Bacik u8 type = btrfs_dir_type(leaf, dir_item); 42422a94d44SJosef Bacik 42522a94d44SJosef Bacik if (type >= BTRFS_FT_MAX) { 42622a94d44SJosef Bacik printk(KERN_CRIT "btrfs: invalid dir item type: %d\n", 42722a94d44SJosef Bacik (int)type); 42822a94d44SJosef Bacik return 1; 42922a94d44SJosef Bacik } 43022a94d44SJosef Bacik 43122a94d44SJosef Bacik if (type == BTRFS_FT_XATTR) 43222a94d44SJosef Bacik namelen = XATTR_NAME_MAX; 43322a94d44SJosef Bacik 43422a94d44SJosef Bacik if (btrfs_dir_name_len(leaf, dir_item) > namelen) { 4359694b3fcSSergei Trofimovich printk(KERN_CRIT "btrfs: invalid dir item name len: %u\n", 43622a94d44SJosef Bacik (unsigned)btrfs_dir_data_len(leaf, dir_item)); 43722a94d44SJosef Bacik return 1; 43822a94d44SJosef Bacik } 43922a94d44SJosef Bacik 44022a94d44SJosef Bacik /* BTRFS_MAX_XATTR_SIZE is the same for all dir items */ 44122a94d44SJosef Bacik if (btrfs_dir_data_len(leaf, dir_item) > BTRFS_MAX_XATTR_SIZE(root)) { 44222a94d44SJosef Bacik printk(KERN_CRIT "btrfs: invalid dir item data len: %u\n", 44322a94d44SJosef Bacik (unsigned)btrfs_dir_data_len(leaf, dir_item)); 44422a94d44SJosef Bacik return 1; 44522a94d44SJosef Bacik } 44622a94d44SJosef Bacik 44722a94d44SJosef Bacik return 0; 44822a94d44SJosef Bacik } 449