1c1d7c514SDavid Sterba // SPDX-License-Identifier: GPL-2.0 26cbd5570SChris Mason /* 36cbd5570SChris Mason * Copyright (C) 2007 Oracle. All rights reserved. 46cbd5570SChris Mason */ 56cbd5570SChris Mason 662e2749eSChris Mason #include "ctree.h" 762e2749eSChris Mason #include "disk-io.h" 8e089f05cSChris Mason #include "transaction.h" 962e2749eSChris Mason 10d352ac68SChris Mason /* 11d352ac68SChris Mason * insert a name into a directory, doing overflow properly if there is a hash 12d352ac68SChris Mason * collision. data_size indicates how big the item inserted should be. On 13d352ac68SChris Mason * success a struct btrfs_dir_item pointer is returned, otherwise it is 14d352ac68SChris Mason * an ERR_PTR. 15d352ac68SChris Mason * 16d352ac68SChris Mason * The name is not copied into the dir item, you have to do that yourself. 17d352ac68SChris Mason */ 1835b7e476SChris Mason static struct btrfs_dir_item *insert_with_overflow(struct btrfs_trans_handle 1935b7e476SChris Mason *trans, 207e38180eSChris Mason struct btrfs_root *root, 217e38180eSChris Mason struct btrfs_path *path, 227e38180eSChris Mason struct btrfs_key *cpu_key, 23e06afa83SChris Mason u32 data_size, 24e06afa83SChris Mason const char *name, 25e06afa83SChris Mason int name_len) 267fcde0e3SChris Mason { 272ff7e61eSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 287fcde0e3SChris Mason int ret; 297e38180eSChris Mason char *ptr; 307e38180eSChris Mason struct btrfs_item *item; 315f39d397SChris Mason struct extent_buffer *leaf; 327fcde0e3SChris Mason 337fcde0e3SChris Mason ret = btrfs_insert_empty_item(trans, root, path, cpu_key, data_size); 347e38180eSChris Mason if (ret == -EEXIST) { 35e06afa83SChris Mason struct btrfs_dir_item *di; 362ff7e61eSJeff Mahoney di = btrfs_match_dir_item_name(fs_info, path, name, name_len); 37e06afa83SChris Mason if (di) 38e06afa83SChris Mason return ERR_PTR(-EEXIST); 392ff7e61eSJeff Mahoney btrfs_extend_item(fs_info, path, data_size); 40143bede5SJeff Mahoney } else if (ret < 0) 4154aa1f4dSChris Mason return ERR_PTR(ret); 427e38180eSChris Mason WARN_ON(ret > 0); 435f39d397SChris Mason leaf = path->nodes[0]; 44dd3cc16bSRoss Kirk item = btrfs_item_nr(path->slots[0]); 457e38180eSChris Mason ptr = btrfs_item_ptr(leaf, path->slots[0], char); 465f39d397SChris Mason BUG_ON(data_size > btrfs_item_size(leaf, item)); 475f39d397SChris Mason ptr += btrfs_item_size(leaf, item) - data_size; 487e38180eSChris Mason return (struct btrfs_dir_item *)ptr; 497fcde0e3SChris Mason } 507fcde0e3SChris Mason 51d352ac68SChris Mason /* 52d352ac68SChris Mason * xattrs work a lot like directories, this inserts an xattr item 53d352ac68SChris Mason * into the tree 54d352ac68SChris Mason */ 555103e947SJosef Bacik int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans, 56f34f57a3SYan, Zheng struct btrfs_root *root, 57f34f57a3SYan, Zheng struct btrfs_path *path, u64 objectid, 58f34f57a3SYan, Zheng const char *name, u16 name_len, 59f34f57a3SYan, Zheng const void *data, u16 data_len) 605103e947SJosef Bacik { 615103e947SJosef Bacik int ret = 0; 625103e947SJosef Bacik struct btrfs_dir_item *dir_item; 635103e947SJosef Bacik unsigned long name_ptr, data_ptr; 645103e947SJosef Bacik struct btrfs_key key, location; 655103e947SJosef Bacik struct btrfs_disk_key disk_key; 665103e947SJosef Bacik struct extent_buffer *leaf; 675103e947SJosef Bacik u32 data_size; 685103e947SJosef Bacik 69b9d04c60SDavid Sterba if (name_len + data_len > BTRFS_MAX_XATTR_SIZE(root->fs_info)) 70b9d04c60SDavid Sterba return -ENOSPC; 71f34f57a3SYan, Zheng 72f34f57a3SYan, Zheng key.objectid = objectid; 73962a298fSDavid Sterba key.type = BTRFS_XATTR_ITEM_KEY; 74df68b8a7SDavid Miller key.offset = btrfs_name_hash(name, name_len); 755103e947SJosef Bacik 765103e947SJosef Bacik data_size = sizeof(*dir_item) + name_len + data_len; 775103e947SJosef Bacik dir_item = insert_with_overflow(trans, root, path, &key, data_size, 785103e947SJosef Bacik name, name_len); 79fa09200bSJosef Bacik if (IS_ERR(dir_item)) 80fa09200bSJosef Bacik return PTR_ERR(dir_item); 815103e947SJosef Bacik memset(&location, 0, sizeof(location)); 825103e947SJosef Bacik 835103e947SJosef Bacik leaf = path->nodes[0]; 845103e947SJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &location); 855103e947SJosef Bacik btrfs_set_dir_item_key(leaf, dir_item, &disk_key); 865103e947SJosef Bacik btrfs_set_dir_type(leaf, dir_item, BTRFS_FT_XATTR); 875103e947SJosef Bacik btrfs_set_dir_name_len(leaf, dir_item, name_len); 88e02119d5SChris Mason btrfs_set_dir_transid(leaf, dir_item, trans->transid); 895103e947SJosef Bacik btrfs_set_dir_data_len(leaf, dir_item, data_len); 905103e947SJosef Bacik name_ptr = (unsigned long)(dir_item + 1); 915103e947SJosef Bacik data_ptr = (unsigned long)((char *)name_ptr + name_len); 925103e947SJosef Bacik 935103e947SJosef Bacik write_extent_buffer(leaf, name, name_ptr, name_len); 945103e947SJosef Bacik write_extent_buffer(leaf, data, data_ptr, data_len); 955103e947SJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 965103e947SJosef Bacik 975103e947SJosef Bacik return ret; 985103e947SJosef Bacik } 995103e947SJosef Bacik 100d352ac68SChris Mason /* 101d352ac68SChris Mason * insert a directory item in the tree, doing all the magic for 102d352ac68SChris Mason * both indexes. 'dir' indicates which objectid to insert it into, 103d352ac68SChris Mason * 'location' is the key to stuff into the directory item, 'type' is the 104d352ac68SChris Mason * type of the inode we're pointing to, and 'index' is the sequence number 105d352ac68SChris Mason * to use for the second index (if one is created). 10679787eaaSJeff Mahoney * Will return 0 or -ENOMEM 107d352ac68SChris Mason */ 108e089f05cSChris Mason int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root 10916cdcec7SMiao Xie *root, const char *name, int name_len, 1108e7611cfSNikolay Borisov struct btrfs_inode *dir, struct btrfs_key *location, 11116cdcec7SMiao Xie u8 type, u64 index) 11262e2749eSChris Mason { 11362e2749eSChris Mason int ret = 0; 114e06afa83SChris Mason int ret2 = 0; 1155caf2a00SChris Mason struct btrfs_path *path; 11662e2749eSChris Mason struct btrfs_dir_item *dir_item; 1175f39d397SChris Mason struct extent_buffer *leaf; 1185f39d397SChris Mason unsigned long name_ptr; 11962e2749eSChris Mason struct btrfs_key key; 1205f39d397SChris Mason struct btrfs_disk_key disk_key; 12162e2749eSChris Mason u32 data_size; 12262e2749eSChris Mason 1238e7611cfSNikolay Borisov key.objectid = btrfs_ino(dir); 124962a298fSDavid Sterba key.type = BTRFS_DIR_ITEM_KEY; 125df68b8a7SDavid Miller key.offset = btrfs_name_hash(name, name_len); 126b9473439SChris Mason 1275caf2a00SChris Mason path = btrfs_alloc_path(); 12816cdcec7SMiao Xie if (!path) 12916cdcec7SMiao Xie return -ENOMEM; 130b9473439SChris Mason path->leave_spinning = 1; 131b9473439SChris Mason 13216cdcec7SMiao Xie btrfs_cpu_key_to_disk(&disk_key, location); 13316cdcec7SMiao Xie 13462e2749eSChris Mason data_size = sizeof(*dir_item) + name_len; 135e06afa83SChris Mason dir_item = insert_with_overflow(trans, root, path, &key, data_size, 136e06afa83SChris Mason name, name_len); 1377e38180eSChris Mason if (IS_ERR(dir_item)) { 1387e38180eSChris Mason ret = PTR_ERR(dir_item); 139e06afa83SChris Mason if (ret == -EEXIST) 140e06afa83SChris Mason goto second_insert; 141c2db1073STsutomu Itoh goto out_free; 1427e38180eSChris Mason } 14362e2749eSChris Mason 1445f39d397SChris Mason leaf = path->nodes[0]; 1455f39d397SChris Mason btrfs_set_dir_item_key(leaf, dir_item, &disk_key); 1465f39d397SChris Mason btrfs_set_dir_type(leaf, dir_item, type); 1475103e947SJosef Bacik btrfs_set_dir_data_len(leaf, dir_item, 0); 1485f39d397SChris Mason btrfs_set_dir_name_len(leaf, dir_item, name_len); 149e02119d5SChris Mason btrfs_set_dir_transid(leaf, dir_item, trans->transid); 1505f39d397SChris Mason name_ptr = (unsigned long)(dir_item + 1); 151c5739bbaSChris Mason 1525f39d397SChris Mason write_extent_buffer(leaf, name, name_ptr, name_len); 1535f39d397SChris Mason btrfs_mark_buffer_dirty(leaf); 1547e38180eSChris Mason 155e06afa83SChris Mason second_insert: 1567e38180eSChris Mason /* FIXME, use some real flag for selecting the extra index */ 1577e38180eSChris Mason if (root == root->fs_info->tree_root) { 1587e38180eSChris Mason ret = 0; 159c2db1073STsutomu Itoh goto out_free; 1607e38180eSChris Mason } 161b3b4aa74SDavid Sterba btrfs_release_path(path); 1627e38180eSChris Mason 1632ff7e61eSJeff Mahoney ret2 = btrfs_insert_delayed_dir_index(trans, root->fs_info, name, 1648e7611cfSNikolay Borisov name_len, dir, &disk_key, type, index); 165c2db1073STsutomu Itoh out_free: 1665caf2a00SChris Mason btrfs_free_path(path); 167e06afa83SChris Mason if (ret) 16862e2749eSChris Mason return ret; 169e06afa83SChris Mason if (ret2) 170e06afa83SChris Mason return ret2; 171e06afa83SChris Mason return 0; 17262e2749eSChris Mason } 17362e2749eSChris Mason 174d352ac68SChris Mason /* 175d352ac68SChris Mason * lookup a directory item based on name. 'dir' is the objectid 176d352ac68SChris Mason * we're searching in, and 'mod' tells us if you plan on deleting the 177d352ac68SChris Mason * item (use mod < 0) or changing the options (use mod > 0) 178d352ac68SChris Mason */ 1797e38180eSChris Mason struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, 1807e38180eSChris Mason struct btrfs_root *root, 1817e38180eSChris Mason struct btrfs_path *path, u64 dir, 1827e38180eSChris Mason const char *name, int name_len, 1837e38180eSChris Mason int mod) 18462e2749eSChris Mason { 1851d4f6404SChris Mason int ret; 18662e2749eSChris Mason struct btrfs_key key; 1871d4f6404SChris Mason int ins_len = mod < 0 ? -1 : 0; 1881d4f6404SChris Mason int cow = mod != 0; 18962e2749eSChris Mason 19062e2749eSChris Mason key.objectid = dir; 191962a298fSDavid Sterba key.type = BTRFS_DIR_ITEM_KEY; 1925f39d397SChris Mason 193df68b8a7SDavid Miller key.offset = btrfs_name_hash(name, name_len); 1945f39d397SChris Mason 195e089f05cSChris Mason ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); 1967fcde0e3SChris Mason if (ret < 0) 1977e38180eSChris Mason return ERR_PTR(ret); 19885d85a74SLi Zefan if (ret > 0) 1997e38180eSChris Mason return NULL; 2007fcde0e3SChris Mason 2012ff7e61eSJeff Mahoney return btrfs_match_dir_item_name(root->fs_info, path, name, name_len); 20262e2749eSChris Mason } 20362e2749eSChris Mason 2049c52057cSChris Mason int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir, 2059c52057cSChris Mason const char *name, int name_len) 2069c52057cSChris Mason { 2079c52057cSChris Mason int ret; 2089c52057cSChris Mason struct btrfs_key key; 2099c52057cSChris Mason struct btrfs_dir_item *di; 2109c52057cSChris Mason int data_size; 2119c52057cSChris Mason struct extent_buffer *leaf; 2129c52057cSChris Mason int slot; 2139c52057cSChris Mason struct btrfs_path *path; 2149c52057cSChris Mason 2159c52057cSChris Mason 2169c52057cSChris Mason path = btrfs_alloc_path(); 2179c52057cSChris Mason if (!path) 2189c52057cSChris Mason return -ENOMEM; 2199c52057cSChris Mason 2209c52057cSChris Mason key.objectid = dir; 221962a298fSDavid Sterba key.type = BTRFS_DIR_ITEM_KEY; 2229c52057cSChris Mason key.offset = btrfs_name_hash(name, name_len); 2239c52057cSChris Mason 2249c52057cSChris Mason ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 2259c52057cSChris Mason 2269c52057cSChris Mason /* return back any errors */ 2279c52057cSChris Mason if (ret < 0) 2289c52057cSChris Mason goto out; 2299c52057cSChris Mason 2309c52057cSChris Mason /* nothing found, we're safe */ 2319c52057cSChris Mason if (ret > 0) { 2329c52057cSChris Mason ret = 0; 2339c52057cSChris Mason goto out; 2349c52057cSChris Mason } 2359c52057cSChris Mason 2369c52057cSChris Mason /* we found an item, look for our name in the item */ 2372ff7e61eSJeff Mahoney di = btrfs_match_dir_item_name(root->fs_info, path, name, name_len); 2389c52057cSChris Mason if (di) { 2399c52057cSChris Mason /* our exact name was found */ 2409c52057cSChris Mason ret = -EEXIST; 2419c52057cSChris Mason goto out; 2429c52057cSChris Mason } 2439c52057cSChris Mason 2449c52057cSChris Mason /* 2459c52057cSChris Mason * see if there is room in the item to insert this 2469c52057cSChris Mason * name 2479c52057cSChris Mason */ 248878f2d2cSFilipe David Borba Manana data_size = sizeof(*di) + name_len; 2499c52057cSChris Mason leaf = path->nodes[0]; 2509c52057cSChris Mason slot = path->slots[0]; 2519c52057cSChris Mason if (data_size + btrfs_item_size_nr(leaf, slot) + 252da17066cSJeff Mahoney sizeof(struct btrfs_item) > BTRFS_LEAF_DATA_SIZE(root->fs_info)) { 2539c52057cSChris Mason ret = -EOVERFLOW; 2549c52057cSChris Mason } else { 2559c52057cSChris Mason /* plenty of insertion room */ 2569c52057cSChris Mason ret = 0; 2579c52057cSChris Mason } 2589c52057cSChris Mason out: 2599c52057cSChris Mason btrfs_free_path(path); 2609c52057cSChris Mason return ret; 2619c52057cSChris Mason } 2629c52057cSChris Mason 263d352ac68SChris Mason /* 264d352ac68SChris Mason * lookup a directory item based on index. 'dir' is the objectid 265d352ac68SChris Mason * we're searching in, and 'mod' tells us if you plan on deleting the 266d352ac68SChris Mason * item (use mod < 0) or changing the options (use mod > 0) 267d352ac68SChris Mason * 268d352ac68SChris Mason * The name is used to make sure the index really points to the name you were 269d352ac68SChris Mason * looking for. 270d352ac68SChris Mason */ 2717e38180eSChris Mason struct btrfs_dir_item * 2727e38180eSChris Mason btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans, 2737e38180eSChris Mason struct btrfs_root *root, 2747e38180eSChris Mason struct btrfs_path *path, u64 dir, 2757e38180eSChris Mason u64 objectid, const char *name, int name_len, 2767e38180eSChris Mason int mod) 2777e38180eSChris Mason { 2787e38180eSChris Mason int ret; 2797e38180eSChris Mason struct btrfs_key key; 2807e38180eSChris Mason int ins_len = mod < 0 ? -1 : 0; 2817e38180eSChris Mason int cow = mod != 0; 2827e38180eSChris Mason 2837e38180eSChris Mason key.objectid = dir; 284962a298fSDavid Sterba key.type = BTRFS_DIR_INDEX_KEY; 2857e38180eSChris Mason key.offset = objectid; 2867e38180eSChris Mason 2877e38180eSChris Mason ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); 2887e38180eSChris Mason if (ret < 0) 2897e38180eSChris Mason return ERR_PTR(ret); 2907e38180eSChris Mason if (ret > 0) 2917e38180eSChris Mason return ERR_PTR(-ENOENT); 2922ff7e61eSJeff Mahoney return btrfs_match_dir_item_name(root->fs_info, path, name, name_len); 2937e38180eSChris Mason } 2947e38180eSChris Mason 2954df27c4dSYan, Zheng struct btrfs_dir_item * 2964df27c4dSYan, Zheng btrfs_search_dir_index_item(struct btrfs_root *root, 2974df27c4dSYan, Zheng struct btrfs_path *path, u64 dirid, 2984df27c4dSYan, Zheng const char *name, int name_len) 2994df27c4dSYan, Zheng { 3004df27c4dSYan, Zheng struct extent_buffer *leaf; 3014df27c4dSYan, Zheng struct btrfs_dir_item *di; 3024df27c4dSYan, Zheng struct btrfs_key key; 3034df27c4dSYan, Zheng u32 nritems; 3044df27c4dSYan, Zheng int ret; 3054df27c4dSYan, Zheng 3064df27c4dSYan, Zheng key.objectid = dirid; 3074df27c4dSYan, Zheng key.type = BTRFS_DIR_INDEX_KEY; 3084df27c4dSYan, Zheng key.offset = 0; 3094df27c4dSYan, Zheng 3104df27c4dSYan, Zheng ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 3114df27c4dSYan, Zheng if (ret < 0) 3124df27c4dSYan, Zheng return ERR_PTR(ret); 3134df27c4dSYan, Zheng 3144df27c4dSYan, Zheng leaf = path->nodes[0]; 3154df27c4dSYan, Zheng nritems = btrfs_header_nritems(leaf); 3164df27c4dSYan, Zheng 3174df27c4dSYan, Zheng while (1) { 3184df27c4dSYan, Zheng if (path->slots[0] >= nritems) { 3194df27c4dSYan, Zheng ret = btrfs_next_leaf(root, path); 3204df27c4dSYan, Zheng if (ret < 0) 3214df27c4dSYan, Zheng return ERR_PTR(ret); 3224df27c4dSYan, Zheng if (ret > 0) 3234df27c4dSYan, Zheng break; 3244df27c4dSYan, Zheng leaf = path->nodes[0]; 3254df27c4dSYan, Zheng nritems = btrfs_header_nritems(leaf); 3264df27c4dSYan, Zheng continue; 3274df27c4dSYan, Zheng } 3284df27c4dSYan, Zheng 3294df27c4dSYan, Zheng btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); 3304df27c4dSYan, Zheng if (key.objectid != dirid || key.type != BTRFS_DIR_INDEX_KEY) 3314df27c4dSYan, Zheng break; 3324df27c4dSYan, Zheng 3332ff7e61eSJeff Mahoney di = btrfs_match_dir_item_name(root->fs_info, path, 3342ff7e61eSJeff Mahoney name, name_len); 3354df27c4dSYan, Zheng if (di) 3364df27c4dSYan, Zheng return di; 3374df27c4dSYan, Zheng 3384df27c4dSYan, Zheng path->slots[0]++; 3394df27c4dSYan, Zheng } 3404df27c4dSYan, Zheng return NULL; 3414df27c4dSYan, Zheng } 3424df27c4dSYan, Zheng 3435103e947SJosef Bacik struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans, 3445103e947SJosef Bacik struct btrfs_root *root, 3455103e947SJosef Bacik struct btrfs_path *path, u64 dir, 3465103e947SJosef Bacik const char *name, u16 name_len, 3475103e947SJosef Bacik int mod) 3485103e947SJosef Bacik { 3495103e947SJosef Bacik int ret; 3505103e947SJosef Bacik struct btrfs_key key; 3515103e947SJosef Bacik int ins_len = mod < 0 ? -1 : 0; 3525103e947SJosef Bacik int cow = mod != 0; 3535103e947SJosef Bacik 3545103e947SJosef Bacik key.objectid = dir; 355962a298fSDavid Sterba key.type = BTRFS_XATTR_ITEM_KEY; 356df68b8a7SDavid Miller key.offset = btrfs_name_hash(name, name_len); 3575103e947SJosef Bacik ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); 3585103e947SJosef Bacik if (ret < 0) 3595103e947SJosef Bacik return ERR_PTR(ret); 36085d85a74SLi Zefan if (ret > 0) 3615103e947SJosef Bacik return NULL; 3625103e947SJosef Bacik 3632ff7e61eSJeff Mahoney return btrfs_match_dir_item_name(root->fs_info, path, name, name_len); 3645103e947SJosef Bacik } 3655103e947SJosef Bacik 366d352ac68SChris Mason /* 367d352ac68SChris Mason * helper function to look at the directory item pointed to by 'path' 368d352ac68SChris Mason * this walks through all the entries in a dir item and finds one 369d352ac68SChris Mason * for a specific name. 370d352ac68SChris Mason */ 3712ff7e61eSJeff Mahoney struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info, 3727f5c1516SChris Mason struct btrfs_path *path, 3737f5c1516SChris Mason const char *name, int name_len) 37462e2749eSChris Mason { 37562e2749eSChris Mason struct btrfs_dir_item *dir_item; 3765f39d397SChris Mason unsigned long name_ptr; 3777e38180eSChris Mason u32 total_len; 3787e38180eSChris Mason u32 cur = 0; 3797e38180eSChris Mason u32 this_len; 3805f39d397SChris Mason struct extent_buffer *leaf; 381a8a2ee0cSChris Mason 3825f39d397SChris Mason leaf = path->nodes[0]; 3837e38180eSChris Mason dir_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dir_item); 38422a94d44SJosef Bacik 3855f39d397SChris Mason total_len = btrfs_item_size_nr(leaf, path->slots[0]); 3867e38180eSChris Mason while (cur < total_len) { 3875f39d397SChris Mason this_len = sizeof(*dir_item) + 3885103e947SJosef Bacik btrfs_dir_name_len(leaf, dir_item) + 3895103e947SJosef Bacik btrfs_dir_data_len(leaf, dir_item); 3905f39d397SChris Mason name_ptr = (unsigned long)(dir_item + 1); 3917e38180eSChris Mason 3925f39d397SChris Mason if (btrfs_dir_name_len(leaf, dir_item) == name_len && 3935f39d397SChris Mason memcmp_extent_buffer(leaf, name, name_ptr, name_len) == 0) 3947e38180eSChris Mason return dir_item; 3957e38180eSChris Mason 3967e38180eSChris Mason cur += this_len; 3977e38180eSChris Mason dir_item = (struct btrfs_dir_item *)((char *)dir_item + 3987e38180eSChris Mason this_len); 39962e2749eSChris Mason } 4007e38180eSChris Mason return NULL; 4017e38180eSChris Mason } 4027e38180eSChris Mason 403d352ac68SChris Mason /* 404d352ac68SChris Mason * given a pointer into a directory item, delete it. This 405d352ac68SChris Mason * handles items that have more than one entry in them. 406d352ac68SChris Mason */ 4077e38180eSChris Mason int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans, 4087e38180eSChris Mason struct btrfs_root *root, 4097e38180eSChris Mason struct btrfs_path *path, 4107e38180eSChris Mason struct btrfs_dir_item *di) 4117e38180eSChris Mason { 4127e38180eSChris Mason 4135f39d397SChris Mason struct extent_buffer *leaf; 4147e38180eSChris Mason u32 sub_item_len; 4157e38180eSChris Mason u32 item_len; 41654aa1f4dSChris Mason int ret = 0; 4177e38180eSChris Mason 4185f39d397SChris Mason leaf = path->nodes[0]; 4195103e947SJosef Bacik sub_item_len = sizeof(*di) + btrfs_dir_name_len(leaf, di) + 4205103e947SJosef Bacik btrfs_dir_data_len(leaf, di); 4215f39d397SChris Mason item_len = btrfs_item_size_nr(leaf, path->slots[0]); 4225f39d397SChris Mason if (sub_item_len == item_len) { 4237e38180eSChris Mason ret = btrfs_del_item(trans, root, path); 4247e38180eSChris Mason } else { 4255f39d397SChris Mason /* MARKER */ 4265f39d397SChris Mason unsigned long ptr = (unsigned long)di; 4275f39d397SChris Mason unsigned long start; 4285f39d397SChris Mason 4295f39d397SChris Mason start = btrfs_item_ptr_offset(leaf, path->slots[0]); 4305f39d397SChris Mason memmove_extent_buffer(leaf, ptr, ptr + sub_item_len, 4317e38180eSChris Mason item_len - (ptr + sub_item_len - start)); 4322ff7e61eSJeff Mahoney btrfs_truncate_item(root->fs_info, path, 4332ff7e61eSJeff Mahoney item_len - sub_item_len, 1); 4347e38180eSChris Mason } 435411fc6bcSAndi Kleen return ret; 4367e38180eSChris Mason } 437