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; 305f39d397SChris Mason struct extent_buffer *leaf; 317fcde0e3SChris Mason 327fcde0e3SChris Mason ret = btrfs_insert_empty_item(trans, root, path, cpu_key, data_size); 337e38180eSChris Mason if (ret == -EEXIST) { 34e06afa83SChris Mason struct btrfs_dir_item *di; 352ff7e61eSJeff Mahoney di = btrfs_match_dir_item_name(fs_info, path, name, name_len); 36e06afa83SChris Mason if (di) 37e06afa83SChris Mason return ERR_PTR(-EEXIST); 38c71dd880SDavid Sterba btrfs_extend_item(path, data_size); 39143bede5SJeff Mahoney } else if (ret < 0) 4054aa1f4dSChris Mason return ERR_PTR(ret); 417e38180eSChris Mason WARN_ON(ret > 0); 425f39d397SChris Mason leaf = path->nodes[0]; 437e38180eSChris Mason ptr = btrfs_item_ptr(leaf, path->slots[0], char); 443212fa14SJosef Bacik ASSERT(data_size <= btrfs_item_size(leaf, path->slots[0])); 453212fa14SJosef Bacik ptr += btrfs_item_size(leaf, path->slots[0]) - data_size; 467e38180eSChris Mason return (struct btrfs_dir_item *)ptr; 477fcde0e3SChris Mason } 487fcde0e3SChris Mason 49d352ac68SChris Mason /* 50d352ac68SChris Mason * xattrs work a lot like directories, this inserts an xattr item 51d352ac68SChris Mason * into the tree 52d352ac68SChris Mason */ 535103e947SJosef Bacik int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans, 54f34f57a3SYan, Zheng struct btrfs_root *root, 55f34f57a3SYan, Zheng struct btrfs_path *path, u64 objectid, 56f34f57a3SYan, Zheng const char *name, u16 name_len, 57f34f57a3SYan, Zheng const void *data, u16 data_len) 585103e947SJosef Bacik { 595103e947SJosef Bacik int ret = 0; 605103e947SJosef Bacik struct btrfs_dir_item *dir_item; 615103e947SJosef Bacik unsigned long name_ptr, data_ptr; 625103e947SJosef Bacik struct btrfs_key key, location; 635103e947SJosef Bacik struct btrfs_disk_key disk_key; 645103e947SJosef Bacik struct extent_buffer *leaf; 655103e947SJosef Bacik u32 data_size; 665103e947SJosef Bacik 67b9d04c60SDavid Sterba if (name_len + data_len > BTRFS_MAX_XATTR_SIZE(root->fs_info)) 68b9d04c60SDavid Sterba return -ENOSPC; 69f34f57a3SYan, Zheng 70f34f57a3SYan, Zheng key.objectid = objectid; 71962a298fSDavid Sterba key.type = BTRFS_XATTR_ITEM_KEY; 72df68b8a7SDavid Miller key.offset = btrfs_name_hash(name, name_len); 735103e947SJosef Bacik 745103e947SJosef Bacik data_size = sizeof(*dir_item) + name_len + data_len; 755103e947SJosef Bacik dir_item = insert_with_overflow(trans, root, path, &key, data_size, 765103e947SJosef Bacik name, name_len); 77fa09200bSJosef Bacik if (IS_ERR(dir_item)) 78fa09200bSJosef Bacik return PTR_ERR(dir_item); 795103e947SJosef Bacik memset(&location, 0, sizeof(location)); 805103e947SJosef Bacik 815103e947SJosef Bacik leaf = path->nodes[0]; 825103e947SJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &location); 835103e947SJosef Bacik btrfs_set_dir_item_key(leaf, dir_item, &disk_key); 845103e947SJosef Bacik btrfs_set_dir_type(leaf, dir_item, BTRFS_FT_XATTR); 855103e947SJosef Bacik btrfs_set_dir_name_len(leaf, dir_item, name_len); 86e02119d5SChris Mason btrfs_set_dir_transid(leaf, dir_item, trans->transid); 875103e947SJosef Bacik btrfs_set_dir_data_len(leaf, dir_item, data_len); 885103e947SJosef Bacik name_ptr = (unsigned long)(dir_item + 1); 895103e947SJosef Bacik data_ptr = (unsigned long)((char *)name_ptr + name_len); 905103e947SJosef Bacik 915103e947SJosef Bacik write_extent_buffer(leaf, name, name_ptr, name_len); 925103e947SJosef Bacik write_extent_buffer(leaf, data, data_ptr, data_len); 935103e947SJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 945103e947SJosef Bacik 955103e947SJosef Bacik return ret; 965103e947SJosef Bacik } 975103e947SJosef Bacik 98d352ac68SChris Mason /* 99d352ac68SChris Mason * insert a directory item in the tree, doing all the magic for 100d352ac68SChris Mason * both indexes. 'dir' indicates which objectid to insert it into, 101d352ac68SChris Mason * 'location' is the key to stuff into the directory item, 'type' is the 102d352ac68SChris Mason * type of the inode we're pointing to, and 'index' is the sequence number 103d352ac68SChris Mason * to use for the second index (if one is created). 10479787eaaSJeff Mahoney * Will return 0 or -ENOMEM 105d352ac68SChris Mason */ 106684572dfSLu Fengqi int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, const char *name, 107684572dfSLu Fengqi int name_len, struct btrfs_inode *dir, 108684572dfSLu Fengqi struct btrfs_key *location, u8 type, u64 index) 10962e2749eSChris Mason { 11062e2749eSChris Mason int ret = 0; 111e06afa83SChris Mason int ret2 = 0; 112684572dfSLu Fengqi struct btrfs_root *root = dir->root; 1135caf2a00SChris Mason struct btrfs_path *path; 11462e2749eSChris Mason struct btrfs_dir_item *dir_item; 1155f39d397SChris Mason struct extent_buffer *leaf; 1165f39d397SChris Mason unsigned long name_ptr; 11762e2749eSChris Mason struct btrfs_key key; 1185f39d397SChris Mason struct btrfs_disk_key disk_key; 11962e2749eSChris Mason u32 data_size; 12062e2749eSChris Mason 1218e7611cfSNikolay Borisov key.objectid = btrfs_ino(dir); 122962a298fSDavid Sterba key.type = BTRFS_DIR_ITEM_KEY; 123df68b8a7SDavid Miller key.offset = btrfs_name_hash(name, name_len); 124b9473439SChris Mason 1255caf2a00SChris Mason path = btrfs_alloc_path(); 12616cdcec7SMiao Xie if (!path) 12716cdcec7SMiao Xie return -ENOMEM; 128b9473439SChris Mason 12916cdcec7SMiao Xie btrfs_cpu_key_to_disk(&disk_key, location); 13016cdcec7SMiao Xie 13162e2749eSChris Mason data_size = sizeof(*dir_item) + name_len; 132e06afa83SChris Mason dir_item = insert_with_overflow(trans, root, path, &key, data_size, 133e06afa83SChris Mason name, name_len); 1347e38180eSChris Mason if (IS_ERR(dir_item)) { 1357e38180eSChris Mason ret = PTR_ERR(dir_item); 136e06afa83SChris Mason if (ret == -EEXIST) 137e06afa83SChris Mason goto second_insert; 138c2db1073STsutomu Itoh goto out_free; 1397e38180eSChris Mason } 14062e2749eSChris Mason 1415f39d397SChris Mason leaf = path->nodes[0]; 1425f39d397SChris Mason btrfs_set_dir_item_key(leaf, dir_item, &disk_key); 1435f39d397SChris Mason btrfs_set_dir_type(leaf, dir_item, type); 1445103e947SJosef Bacik btrfs_set_dir_data_len(leaf, dir_item, 0); 1455f39d397SChris Mason btrfs_set_dir_name_len(leaf, dir_item, name_len); 146e02119d5SChris Mason btrfs_set_dir_transid(leaf, dir_item, trans->transid); 1475f39d397SChris Mason name_ptr = (unsigned long)(dir_item + 1); 148c5739bbaSChris Mason 1495f39d397SChris Mason write_extent_buffer(leaf, name, name_ptr, name_len); 1505f39d397SChris Mason btrfs_mark_buffer_dirty(leaf); 1517e38180eSChris Mason 152e06afa83SChris Mason second_insert: 1537e38180eSChris Mason /* FIXME, use some real flag for selecting the extra index */ 1547e38180eSChris Mason if (root == root->fs_info->tree_root) { 1557e38180eSChris Mason ret = 0; 156c2db1073STsutomu Itoh goto out_free; 1577e38180eSChris Mason } 158b3b4aa74SDavid Sterba btrfs_release_path(path); 1597e38180eSChris Mason 1604465c8b4SLu Fengqi ret2 = btrfs_insert_delayed_dir_index(trans, name, name_len, dir, 1614465c8b4SLu Fengqi &disk_key, type, index); 162c2db1073STsutomu Itoh out_free: 1635caf2a00SChris Mason btrfs_free_path(path); 164e06afa83SChris Mason if (ret) 16562e2749eSChris Mason return ret; 166e06afa83SChris Mason if (ret2) 167e06afa83SChris Mason return ret2; 168e06afa83SChris Mason return 0; 16962e2749eSChris Mason } 17062e2749eSChris Mason 171a7d1c5dcSMarcos Paulo de Souza static struct btrfs_dir_item *btrfs_lookup_match_dir( 172a7d1c5dcSMarcos Paulo de Souza struct btrfs_trans_handle *trans, 173a7d1c5dcSMarcos Paulo de Souza struct btrfs_root *root, struct btrfs_path *path, 174a7d1c5dcSMarcos Paulo de Souza struct btrfs_key *key, const char *name, 175a7d1c5dcSMarcos Paulo de Souza int name_len, int mod) 176a7d1c5dcSMarcos Paulo de Souza { 177a7d1c5dcSMarcos Paulo de Souza const int ins_len = (mod < 0 ? -1 : 0); 178a7d1c5dcSMarcos Paulo de Souza const int cow = (mod != 0); 179a7d1c5dcSMarcos Paulo de Souza int ret; 180a7d1c5dcSMarcos Paulo de Souza 181a7d1c5dcSMarcos Paulo de Souza ret = btrfs_search_slot(trans, root, key, path, ins_len, cow); 182a7d1c5dcSMarcos Paulo de Souza if (ret < 0) 183a7d1c5dcSMarcos Paulo de Souza return ERR_PTR(ret); 184a7d1c5dcSMarcos Paulo de Souza if (ret > 0) 185a7d1c5dcSMarcos Paulo de Souza return ERR_PTR(-ENOENT); 186a7d1c5dcSMarcos Paulo de Souza 187a7d1c5dcSMarcos Paulo de Souza return btrfs_match_dir_item_name(root->fs_info, path, name, name_len); 188a7d1c5dcSMarcos Paulo de Souza } 189a7d1c5dcSMarcos Paulo de Souza 190d352ac68SChris Mason /* 1918dcbc261SFilipe Manana * Lookup for a directory item by name. 1928dcbc261SFilipe Manana * 1938dcbc261SFilipe Manana * @trans: The transaction handle to use. Can be NULL if @mod is 0. 1948dcbc261SFilipe Manana * @root: The root of the target tree. 1958dcbc261SFilipe Manana * @path: Path to use for the search. 1968dcbc261SFilipe Manana * @dir: The inode number (objectid) of the directory. 1978dcbc261SFilipe Manana * @name: The name associated to the directory entry we are looking for. 1988dcbc261SFilipe Manana * @name_len: The length of the name. 1998dcbc261SFilipe Manana * @mod: Used to indicate if the tree search is meant for a read only 2008dcbc261SFilipe Manana * lookup, for a modification lookup or for a deletion lookup, so 2018dcbc261SFilipe Manana * its value should be 0, 1 or -1, respectively. 2028dcbc261SFilipe Manana * 2038dcbc261SFilipe Manana * Returns: NULL if the dir item does not exists, an error pointer if an error 2048dcbc261SFilipe Manana * happened, or a pointer to a dir item if a dir item exists for the given name. 205d352ac68SChris Mason */ 2067e38180eSChris Mason struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, 2077e38180eSChris Mason struct btrfs_root *root, 2087e38180eSChris Mason struct btrfs_path *path, u64 dir, 2097e38180eSChris Mason const char *name, int name_len, 2107e38180eSChris Mason int mod) 21162e2749eSChris Mason { 21262e2749eSChris Mason struct btrfs_key key; 213a7d1c5dcSMarcos Paulo de Souza struct btrfs_dir_item *di; 21462e2749eSChris Mason 21562e2749eSChris Mason key.objectid = dir; 216962a298fSDavid Sterba key.type = BTRFS_DIR_ITEM_KEY; 217df68b8a7SDavid Miller key.offset = btrfs_name_hash(name, name_len); 2185f39d397SChris Mason 219a7d1c5dcSMarcos Paulo de Souza di = btrfs_lookup_match_dir(trans, root, path, &key, name, name_len, mod); 220a7d1c5dcSMarcos Paulo de Souza if (IS_ERR(di) && PTR_ERR(di) == -ENOENT) 2217e38180eSChris Mason return NULL; 2227fcde0e3SChris Mason 223a7d1c5dcSMarcos Paulo de Souza return di; 22462e2749eSChris Mason } 22562e2749eSChris Mason 2269c52057cSChris Mason int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir, 2279c52057cSChris Mason const char *name, int name_len) 2289c52057cSChris Mason { 2299c52057cSChris Mason int ret; 2309c52057cSChris Mason struct btrfs_key key; 2319c52057cSChris Mason struct btrfs_dir_item *di; 2329c52057cSChris Mason int data_size; 2339c52057cSChris Mason struct extent_buffer *leaf; 2349c52057cSChris Mason int slot; 2359c52057cSChris Mason struct btrfs_path *path; 2369c52057cSChris Mason 2379c52057cSChris Mason path = btrfs_alloc_path(); 2389c52057cSChris Mason if (!path) 2399c52057cSChris Mason return -ENOMEM; 2409c52057cSChris Mason 2419c52057cSChris Mason key.objectid = dir; 242962a298fSDavid Sterba key.type = BTRFS_DIR_ITEM_KEY; 2439c52057cSChris Mason key.offset = btrfs_name_hash(name, name_len); 2449c52057cSChris Mason 245a7d1c5dcSMarcos Paulo de Souza di = btrfs_lookup_match_dir(NULL, root, path, &key, name, name_len, 0); 246a7d1c5dcSMarcos Paulo de Souza if (IS_ERR(di)) { 247a7d1c5dcSMarcos Paulo de Souza ret = PTR_ERR(di); 248a7d1c5dcSMarcos Paulo de Souza /* Nothing found, we're safe */ 249a7d1c5dcSMarcos Paulo de Souza if (ret == -ENOENT) { 2509c52057cSChris Mason ret = 0; 2519c52057cSChris Mason goto out; 2529c52057cSChris Mason } 2539c52057cSChris Mason 254a7d1c5dcSMarcos Paulo de Souza if (ret < 0) 255a7d1c5dcSMarcos Paulo de Souza goto out; 256a7d1c5dcSMarcos Paulo de Souza } 257a7d1c5dcSMarcos Paulo de Souza 2589c52057cSChris Mason /* we found an item, look for our name in the item */ 2599c52057cSChris Mason if (di) { 2609c52057cSChris Mason /* our exact name was found */ 2619c52057cSChris Mason ret = -EEXIST; 2629c52057cSChris Mason goto out; 2639c52057cSChris Mason } 2649c52057cSChris Mason 2659c52057cSChris Mason /* 2669c52057cSChris Mason * see if there is room in the item to insert this 2679c52057cSChris Mason * name 2689c52057cSChris Mason */ 269878f2d2cSFilipe David Borba Manana data_size = sizeof(*di) + name_len; 2709c52057cSChris Mason leaf = path->nodes[0]; 2719c52057cSChris Mason slot = path->slots[0]; 2723212fa14SJosef Bacik if (data_size + btrfs_item_size(leaf, slot) + 273da17066cSJeff Mahoney sizeof(struct btrfs_item) > BTRFS_LEAF_DATA_SIZE(root->fs_info)) { 2749c52057cSChris Mason ret = -EOVERFLOW; 2759c52057cSChris Mason } else { 2769c52057cSChris Mason /* plenty of insertion room */ 2779c52057cSChris Mason ret = 0; 2789c52057cSChris Mason } 2799c52057cSChris Mason out: 2809c52057cSChris Mason btrfs_free_path(path); 2819c52057cSChris Mason return ret; 2829c52057cSChris Mason } 2839c52057cSChris Mason 284d352ac68SChris Mason /* 2858dcbc261SFilipe Manana * Lookup for a directory index item by name and index number. 286d352ac68SChris Mason * 2878dcbc261SFilipe Manana * @trans: The transaction handle to use. Can be NULL if @mod is 0. 2888dcbc261SFilipe Manana * @root: The root of the target tree. 2898dcbc261SFilipe Manana * @path: Path to use for the search. 2908dcbc261SFilipe Manana * @dir: The inode number (objectid) of the directory. 2918dcbc261SFilipe Manana * @index: The index number. 2928dcbc261SFilipe Manana * @name: The name associated to the directory entry we are looking for. 2938dcbc261SFilipe Manana * @name_len: The length of the name. 2948dcbc261SFilipe Manana * @mod: Used to indicate if the tree search is meant for a read only 2958dcbc261SFilipe Manana * lookup, for a modification lookup or for a deletion lookup, so 2968dcbc261SFilipe Manana * its value should be 0, 1 or -1, respectively. 2978dcbc261SFilipe Manana * 2988dcbc261SFilipe Manana * Returns: NULL if the dir index item does not exists, an error pointer if an 2998dcbc261SFilipe Manana * error happened, or a pointer to a dir item if the dir index item exists and 3008dcbc261SFilipe Manana * matches the criteria (name and index number). 301d352ac68SChris Mason */ 3027e38180eSChris Mason struct btrfs_dir_item * 3037e38180eSChris Mason btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans, 3047e38180eSChris Mason struct btrfs_root *root, 3057e38180eSChris Mason struct btrfs_path *path, u64 dir, 3068dcbc261SFilipe Manana u64 index, const char *name, int name_len, 3077e38180eSChris Mason int mod) 3087e38180eSChris Mason { 3098dcbc261SFilipe Manana struct btrfs_dir_item *di; 3107e38180eSChris Mason struct btrfs_key key; 3117e38180eSChris Mason 3127e38180eSChris Mason key.objectid = dir; 313962a298fSDavid Sterba key.type = BTRFS_DIR_INDEX_KEY; 3148dcbc261SFilipe Manana key.offset = index; 3157e38180eSChris Mason 3168dcbc261SFilipe Manana di = btrfs_lookup_match_dir(trans, root, path, &key, name, name_len, mod); 3178dcbc261SFilipe Manana if (di == ERR_PTR(-ENOENT)) 3188dcbc261SFilipe Manana return NULL; 3198dcbc261SFilipe Manana 3208dcbc261SFilipe Manana return di; 3217e38180eSChris Mason } 3227e38180eSChris Mason 3234df27c4dSYan, Zheng struct btrfs_dir_item * 3244df27c4dSYan, Zheng btrfs_search_dir_index_item(struct btrfs_root *root, 3254df27c4dSYan, Zheng struct btrfs_path *path, u64 dirid, 3264df27c4dSYan, Zheng const char *name, int name_len) 3274df27c4dSYan, Zheng { 3284df27c4dSYan, Zheng struct btrfs_dir_item *di; 3294df27c4dSYan, Zheng struct btrfs_key key; 3304df27c4dSYan, Zheng int ret; 3314df27c4dSYan, Zheng 3324df27c4dSYan, Zheng key.objectid = dirid; 3334df27c4dSYan, Zheng key.type = BTRFS_DIR_INDEX_KEY; 3344df27c4dSYan, Zheng key.offset = 0; 3354df27c4dSYan, Zheng 336*9dcbe16fSGabriel Niebler btrfs_for_each_slot(root, &key, &key, path, ret) { 3374df27c4dSYan, Zheng if (key.objectid != dirid || key.type != BTRFS_DIR_INDEX_KEY) 3384df27c4dSYan, Zheng break; 3394df27c4dSYan, Zheng 3402ff7e61eSJeff Mahoney di = btrfs_match_dir_item_name(root->fs_info, path, 3412ff7e61eSJeff Mahoney name, name_len); 3424df27c4dSYan, Zheng if (di) 3434df27c4dSYan, Zheng return di; 3444df27c4dSYan, Zheng } 345*9dcbe16fSGabriel Niebler /* Adjust return code if the key was not found in the next leaf. */ 346*9dcbe16fSGabriel Niebler if (ret > 0) 347*9dcbe16fSGabriel Niebler ret = 0; 348*9dcbe16fSGabriel Niebler 349*9dcbe16fSGabriel Niebler return ERR_PTR(ret); 3504df27c4dSYan, Zheng } 3514df27c4dSYan, Zheng 3525103e947SJosef Bacik struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans, 3535103e947SJosef Bacik struct btrfs_root *root, 3545103e947SJosef Bacik struct btrfs_path *path, u64 dir, 3555103e947SJosef Bacik const char *name, u16 name_len, 3565103e947SJosef Bacik int mod) 3575103e947SJosef Bacik { 3585103e947SJosef Bacik struct btrfs_key key; 359a7d1c5dcSMarcos Paulo de Souza struct btrfs_dir_item *di; 3605103e947SJosef Bacik 3615103e947SJosef Bacik key.objectid = dir; 362962a298fSDavid Sterba key.type = BTRFS_XATTR_ITEM_KEY; 363df68b8a7SDavid Miller key.offset = btrfs_name_hash(name, name_len); 364a7d1c5dcSMarcos Paulo de Souza 365a7d1c5dcSMarcos Paulo de Souza di = btrfs_lookup_match_dir(trans, root, path, &key, name, name_len, mod); 366a7d1c5dcSMarcos Paulo de Souza if (IS_ERR(di) && PTR_ERR(di) == -ENOENT) 3675103e947SJosef Bacik return NULL; 3685103e947SJosef Bacik 369a7d1c5dcSMarcos Paulo de Souza return di; 3705103e947SJosef Bacik } 3715103e947SJosef Bacik 372d352ac68SChris Mason /* 373d352ac68SChris Mason * helper function to look at the directory item pointed to by 'path' 374d352ac68SChris Mason * this walks through all the entries in a dir item and finds one 375d352ac68SChris Mason * for a specific name. 376d352ac68SChris Mason */ 3772ff7e61eSJeff Mahoney struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info, 3787f5c1516SChris Mason struct btrfs_path *path, 3797f5c1516SChris Mason const char *name, int name_len) 38062e2749eSChris Mason { 38162e2749eSChris Mason struct btrfs_dir_item *dir_item; 3825f39d397SChris Mason unsigned long name_ptr; 3837e38180eSChris Mason u32 total_len; 3847e38180eSChris Mason u32 cur = 0; 3857e38180eSChris Mason u32 this_len; 3865f39d397SChris Mason struct extent_buffer *leaf; 387a8a2ee0cSChris Mason 3885f39d397SChris Mason leaf = path->nodes[0]; 3897e38180eSChris Mason dir_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dir_item); 39022a94d44SJosef Bacik 3913212fa14SJosef Bacik total_len = btrfs_item_size(leaf, path->slots[0]); 3927e38180eSChris Mason while (cur < total_len) { 3935f39d397SChris Mason this_len = sizeof(*dir_item) + 3945103e947SJosef Bacik btrfs_dir_name_len(leaf, dir_item) + 3955103e947SJosef Bacik btrfs_dir_data_len(leaf, dir_item); 3965f39d397SChris Mason name_ptr = (unsigned long)(dir_item + 1); 3977e38180eSChris Mason 3985f39d397SChris Mason if (btrfs_dir_name_len(leaf, dir_item) == name_len && 3995f39d397SChris Mason memcmp_extent_buffer(leaf, name, name_ptr, name_len) == 0) 4007e38180eSChris Mason return dir_item; 4017e38180eSChris Mason 4027e38180eSChris Mason cur += this_len; 4037e38180eSChris Mason dir_item = (struct btrfs_dir_item *)((char *)dir_item + 4047e38180eSChris Mason this_len); 40562e2749eSChris Mason } 4067e38180eSChris Mason return NULL; 4077e38180eSChris Mason } 4087e38180eSChris Mason 409d352ac68SChris Mason /* 410d352ac68SChris Mason * given a pointer into a directory item, delete it. This 411d352ac68SChris Mason * handles items that have more than one entry in them. 412d352ac68SChris Mason */ 4137e38180eSChris Mason int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans, 4147e38180eSChris Mason struct btrfs_root *root, 4157e38180eSChris Mason struct btrfs_path *path, 4167e38180eSChris Mason struct btrfs_dir_item *di) 4177e38180eSChris Mason { 4187e38180eSChris Mason 4195f39d397SChris Mason struct extent_buffer *leaf; 4207e38180eSChris Mason u32 sub_item_len; 4217e38180eSChris Mason u32 item_len; 42254aa1f4dSChris Mason int ret = 0; 4237e38180eSChris Mason 4245f39d397SChris Mason leaf = path->nodes[0]; 4255103e947SJosef Bacik sub_item_len = sizeof(*di) + btrfs_dir_name_len(leaf, di) + 4265103e947SJosef Bacik btrfs_dir_data_len(leaf, di); 4273212fa14SJosef Bacik item_len = btrfs_item_size(leaf, path->slots[0]); 4285f39d397SChris Mason if (sub_item_len == item_len) { 4297e38180eSChris Mason ret = btrfs_del_item(trans, root, path); 4307e38180eSChris Mason } else { 4315f39d397SChris Mason /* MARKER */ 4325f39d397SChris Mason unsigned long ptr = (unsigned long)di; 4335f39d397SChris Mason unsigned long start; 4345f39d397SChris Mason 4355f39d397SChris Mason start = btrfs_item_ptr_offset(leaf, path->slots[0]); 4365f39d397SChris Mason memmove_extent_buffer(leaf, ptr, ptr + sub_item_len, 4377e38180eSChris Mason item_len - (ptr + sub_item_len - start)); 43878ac4f9eSDavid Sterba btrfs_truncate_item(path, item_len - sub_item_len, 1); 4397e38180eSChris Mason } 440411fc6bcSAndi Kleen return ret; 4417e38180eSChris Mason } 442