1c1d7c514SDavid Sterba // SPDX-License-Identifier: GPL-2.0 26cbd5570SChris Mason /* 36cbd5570SChris Mason * Copyright (C) 2007 Oracle. All rights reserved. 46cbd5570SChris Mason */ 56cbd5570SChris Mason 69b569ea0SJosef Bacik #include "messages.h" 762e2749eSChris Mason #include "ctree.h" 862e2749eSChris Mason #include "disk-io.h" 9e089f05cSChris Mason #include "transaction.h" 1007e81dc9SJosef Bacik #include "accessors.h" 1162e2749eSChris Mason 12d352ac68SChris Mason /* 13d352ac68SChris Mason * insert a name into a directory, doing overflow properly if there is a hash 14d352ac68SChris Mason * collision. data_size indicates how big the item inserted should be. On 15d352ac68SChris Mason * success a struct btrfs_dir_item pointer is returned, otherwise it is 16d352ac68SChris Mason * an ERR_PTR. 17d352ac68SChris Mason * 18d352ac68SChris Mason * The name is not copied into the dir item, you have to do that yourself. 19d352ac68SChris Mason */ 2035b7e476SChris Mason static struct btrfs_dir_item *insert_with_overflow(struct btrfs_trans_handle 2135b7e476SChris Mason *trans, 227e38180eSChris Mason struct btrfs_root *root, 237e38180eSChris Mason struct btrfs_path *path, 247e38180eSChris Mason struct btrfs_key *cpu_key, 25e06afa83SChris Mason u32 data_size, 26e06afa83SChris Mason const char *name, 27e06afa83SChris Mason int name_len) 287fcde0e3SChris Mason { 292ff7e61eSJeff Mahoney struct btrfs_fs_info *fs_info = root->fs_info; 307fcde0e3SChris Mason int ret; 317e38180eSChris Mason char *ptr; 325f39d397SChris Mason struct extent_buffer *leaf; 337fcde0e3SChris Mason 347fcde0e3SChris Mason ret = btrfs_insert_empty_item(trans, root, path, cpu_key, data_size); 357e38180eSChris Mason if (ret == -EEXIST) { 36e06afa83SChris Mason struct btrfs_dir_item *di; 372ff7e61eSJeff Mahoney di = btrfs_match_dir_item_name(fs_info, path, name, name_len); 38e06afa83SChris Mason if (di) 39e06afa83SChris Mason return ERR_PTR(-EEXIST); 40c71dd880SDavid Sterba btrfs_extend_item(path, data_size); 41143bede5SJeff Mahoney } else if (ret < 0) 4254aa1f4dSChris Mason return ERR_PTR(ret); 437e38180eSChris Mason WARN_ON(ret > 0); 445f39d397SChris Mason leaf = path->nodes[0]; 457e38180eSChris Mason ptr = btrfs_item_ptr(leaf, path->slots[0], char); 463212fa14SJosef Bacik ASSERT(data_size <= btrfs_item_size(leaf, path->slots[0])); 473212fa14SJosef Bacik ptr += btrfs_item_size(leaf, path->slots[0]) - 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 */ 108*e43eec81SSweet Tea Dorminy int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, 109*e43eec81SSweet Tea Dorminy const struct qstr *name, struct btrfs_inode *dir, 110684572dfSLu Fengqi struct btrfs_key *location, u8 type, u64 index) 11162e2749eSChris Mason { 11262e2749eSChris Mason int ret = 0; 113e06afa83SChris Mason int ret2 = 0; 114684572dfSLu Fengqi struct btrfs_root *root = dir->root; 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; 125*e43eec81SSweet Tea Dorminy key.offset = btrfs_name_hash(name->name, name->len); 126b9473439SChris Mason 1275caf2a00SChris Mason path = btrfs_alloc_path(); 12816cdcec7SMiao Xie if (!path) 12916cdcec7SMiao Xie return -ENOMEM; 130b9473439SChris Mason 13116cdcec7SMiao Xie btrfs_cpu_key_to_disk(&disk_key, location); 13216cdcec7SMiao Xie 133*e43eec81SSweet Tea Dorminy data_size = sizeof(*dir_item) + name->len; 134e06afa83SChris Mason dir_item = insert_with_overflow(trans, root, path, &key, data_size, 135*e43eec81SSweet Tea Dorminy name->name, name->len); 1367e38180eSChris Mason if (IS_ERR(dir_item)) { 1377e38180eSChris Mason ret = PTR_ERR(dir_item); 138e06afa83SChris Mason if (ret == -EEXIST) 139e06afa83SChris Mason goto second_insert; 140c2db1073STsutomu Itoh goto out_free; 1417e38180eSChris Mason } 14262e2749eSChris Mason 1435f39d397SChris Mason leaf = path->nodes[0]; 1445f39d397SChris Mason btrfs_set_dir_item_key(leaf, dir_item, &disk_key); 1455f39d397SChris Mason btrfs_set_dir_type(leaf, dir_item, type); 1465103e947SJosef Bacik btrfs_set_dir_data_len(leaf, dir_item, 0); 147*e43eec81SSweet Tea Dorminy btrfs_set_dir_name_len(leaf, dir_item, name->len); 148e02119d5SChris Mason btrfs_set_dir_transid(leaf, dir_item, trans->transid); 1495f39d397SChris Mason name_ptr = (unsigned long)(dir_item + 1); 150c5739bbaSChris Mason 151*e43eec81SSweet Tea Dorminy write_extent_buffer(leaf, name->name, name_ptr, name->len); 1525f39d397SChris Mason btrfs_mark_buffer_dirty(leaf); 1537e38180eSChris Mason 154e06afa83SChris Mason second_insert: 1557e38180eSChris Mason /* FIXME, use some real flag for selecting the extra index */ 1567e38180eSChris Mason if (root == root->fs_info->tree_root) { 1577e38180eSChris Mason ret = 0; 158c2db1073STsutomu Itoh goto out_free; 1597e38180eSChris Mason } 160b3b4aa74SDavid Sterba btrfs_release_path(path); 1617e38180eSChris Mason 162*e43eec81SSweet Tea Dorminy ret2 = btrfs_insert_delayed_dir_index(trans, name->name, name->len, dir, 1634465c8b4SLu Fengqi &disk_key, type, index); 164c2db1073STsutomu Itoh out_free: 1655caf2a00SChris Mason btrfs_free_path(path); 166e06afa83SChris Mason if (ret) 16762e2749eSChris Mason return ret; 168e06afa83SChris Mason if (ret2) 169e06afa83SChris Mason return ret2; 170e06afa83SChris Mason return 0; 17162e2749eSChris Mason } 17262e2749eSChris Mason 173a7d1c5dcSMarcos Paulo de Souza static struct btrfs_dir_item *btrfs_lookup_match_dir( 174a7d1c5dcSMarcos Paulo de Souza struct btrfs_trans_handle *trans, 175a7d1c5dcSMarcos Paulo de Souza struct btrfs_root *root, struct btrfs_path *path, 176a7d1c5dcSMarcos Paulo de Souza struct btrfs_key *key, const char *name, 177a7d1c5dcSMarcos Paulo de Souza int name_len, int mod) 178a7d1c5dcSMarcos Paulo de Souza { 179a7d1c5dcSMarcos Paulo de Souza const int ins_len = (mod < 0 ? -1 : 0); 180a7d1c5dcSMarcos Paulo de Souza const int cow = (mod != 0); 181a7d1c5dcSMarcos Paulo de Souza int ret; 182a7d1c5dcSMarcos Paulo de Souza 183a7d1c5dcSMarcos Paulo de Souza ret = btrfs_search_slot(trans, root, key, path, ins_len, cow); 184a7d1c5dcSMarcos Paulo de Souza if (ret < 0) 185a7d1c5dcSMarcos Paulo de Souza return ERR_PTR(ret); 186a7d1c5dcSMarcos Paulo de Souza if (ret > 0) 187a7d1c5dcSMarcos Paulo de Souza return ERR_PTR(-ENOENT); 188a7d1c5dcSMarcos Paulo de Souza 189a7d1c5dcSMarcos Paulo de Souza return btrfs_match_dir_item_name(root->fs_info, path, name, name_len); 190a7d1c5dcSMarcos Paulo de Souza } 191a7d1c5dcSMarcos Paulo de Souza 192d352ac68SChris Mason /* 1938dcbc261SFilipe Manana * Lookup for a directory item by name. 1948dcbc261SFilipe Manana * 1958dcbc261SFilipe Manana * @trans: The transaction handle to use. Can be NULL if @mod is 0. 1968dcbc261SFilipe Manana * @root: The root of the target tree. 1978dcbc261SFilipe Manana * @path: Path to use for the search. 1988dcbc261SFilipe Manana * @dir: The inode number (objectid) of the directory. 1998dcbc261SFilipe Manana * @name: The name associated to the directory entry we are looking for. 2008dcbc261SFilipe Manana * @name_len: The length of the name. 2018dcbc261SFilipe Manana * @mod: Used to indicate if the tree search is meant for a read only 2028dcbc261SFilipe Manana * lookup, for a modification lookup or for a deletion lookup, so 2038dcbc261SFilipe Manana * its value should be 0, 1 or -1, respectively. 2048dcbc261SFilipe Manana * 2058dcbc261SFilipe Manana * Returns: NULL if the dir item does not exists, an error pointer if an error 2068dcbc261SFilipe Manana * happened, or a pointer to a dir item if a dir item exists for the given name. 207d352ac68SChris Mason */ 2087e38180eSChris Mason struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, 2097e38180eSChris Mason struct btrfs_root *root, 2107e38180eSChris Mason struct btrfs_path *path, u64 dir, 211*e43eec81SSweet Tea Dorminy const struct qstr *name, 2127e38180eSChris Mason int mod) 21362e2749eSChris Mason { 21462e2749eSChris Mason struct btrfs_key key; 215a7d1c5dcSMarcos Paulo de Souza struct btrfs_dir_item *di; 21662e2749eSChris Mason 21762e2749eSChris Mason key.objectid = dir; 218962a298fSDavid Sterba key.type = BTRFS_DIR_ITEM_KEY; 219*e43eec81SSweet Tea Dorminy key.offset = btrfs_name_hash(name->name, name->len); 2205f39d397SChris Mason 221*e43eec81SSweet Tea Dorminy di = btrfs_lookup_match_dir(trans, root, path, &key, name->name, 222*e43eec81SSweet Tea Dorminy name->len, mod); 223a7d1c5dcSMarcos Paulo de Souza if (IS_ERR(di) && PTR_ERR(di) == -ENOENT) 2247e38180eSChris Mason return NULL; 2257fcde0e3SChris Mason 226a7d1c5dcSMarcos Paulo de Souza return di; 22762e2749eSChris Mason } 22862e2749eSChris Mason 2299c52057cSChris Mason int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir, 230*e43eec81SSweet Tea Dorminy const struct qstr *name) 2319c52057cSChris Mason { 2329c52057cSChris Mason int ret; 2339c52057cSChris Mason struct btrfs_key key; 2349c52057cSChris Mason struct btrfs_dir_item *di; 2359c52057cSChris Mason int data_size; 2369c52057cSChris Mason struct extent_buffer *leaf; 2379c52057cSChris Mason int slot; 2389c52057cSChris Mason struct btrfs_path *path; 2399c52057cSChris Mason 2409c52057cSChris Mason path = btrfs_alloc_path(); 2419c52057cSChris Mason if (!path) 2429c52057cSChris Mason return -ENOMEM; 2439c52057cSChris Mason 2449c52057cSChris Mason key.objectid = dir; 245962a298fSDavid Sterba key.type = BTRFS_DIR_ITEM_KEY; 246*e43eec81SSweet Tea Dorminy key.offset = btrfs_name_hash(name->name, name->len); 2479c52057cSChris Mason 248*e43eec81SSweet Tea Dorminy di = btrfs_lookup_match_dir(NULL, root, path, &key, name->name, 249*e43eec81SSweet Tea Dorminy name->len, 0); 250a7d1c5dcSMarcos Paulo de Souza if (IS_ERR(di)) { 251a7d1c5dcSMarcos Paulo de Souza ret = PTR_ERR(di); 252a7d1c5dcSMarcos Paulo de Souza /* Nothing found, we're safe */ 253a7d1c5dcSMarcos Paulo de Souza if (ret == -ENOENT) { 2549c52057cSChris Mason ret = 0; 2559c52057cSChris Mason goto out; 2569c52057cSChris Mason } 2579c52057cSChris Mason 258a7d1c5dcSMarcos Paulo de Souza if (ret < 0) 259a7d1c5dcSMarcos Paulo de Souza goto out; 260a7d1c5dcSMarcos Paulo de Souza } 261a7d1c5dcSMarcos Paulo de Souza 2629c52057cSChris Mason /* we found an item, look for our name in the item */ 2639c52057cSChris Mason if (di) { 2649c52057cSChris Mason /* our exact name was found */ 2659c52057cSChris Mason ret = -EEXIST; 2669c52057cSChris Mason goto out; 2679c52057cSChris Mason } 2689c52057cSChris Mason 269*e43eec81SSweet Tea Dorminy /* See if there is room in the item to insert this name. */ 270*e43eec81SSweet Tea Dorminy data_size = sizeof(*di) + name->len; 2719c52057cSChris Mason leaf = path->nodes[0]; 2729c52057cSChris Mason slot = path->slots[0]; 2733212fa14SJosef Bacik if (data_size + btrfs_item_size(leaf, slot) + 274da17066cSJeff Mahoney sizeof(struct btrfs_item) > BTRFS_LEAF_DATA_SIZE(root->fs_info)) { 2759c52057cSChris Mason ret = -EOVERFLOW; 2769c52057cSChris Mason } else { 2779c52057cSChris Mason /* plenty of insertion room */ 2789c52057cSChris Mason ret = 0; 2799c52057cSChris Mason } 2809c52057cSChris Mason out: 2819c52057cSChris Mason btrfs_free_path(path); 2829c52057cSChris Mason return ret; 2839c52057cSChris Mason } 2849c52057cSChris Mason 285d352ac68SChris Mason /* 2868dcbc261SFilipe Manana * Lookup for a directory index item by name and index number. 287d352ac68SChris Mason * 2888dcbc261SFilipe Manana * @trans: The transaction handle to use. Can be NULL if @mod is 0. 2898dcbc261SFilipe Manana * @root: The root of the target tree. 2908dcbc261SFilipe Manana * @path: Path to use for the search. 2918dcbc261SFilipe Manana * @dir: The inode number (objectid) of the directory. 2928dcbc261SFilipe Manana * @index: The index number. 2938dcbc261SFilipe Manana * @name: The name associated to the directory entry we are looking for. 2948dcbc261SFilipe Manana * @name_len: The length of the name. 2958dcbc261SFilipe Manana * @mod: Used to indicate if the tree search is meant for a read only 2968dcbc261SFilipe Manana * lookup, for a modification lookup or for a deletion lookup, so 2978dcbc261SFilipe Manana * its value should be 0, 1 or -1, respectively. 2988dcbc261SFilipe Manana * 2998dcbc261SFilipe Manana * Returns: NULL if the dir index item does not exists, an error pointer if an 3008dcbc261SFilipe Manana * error happened, or a pointer to a dir item if the dir index item exists and 3018dcbc261SFilipe Manana * matches the criteria (name and index number). 302d352ac68SChris Mason */ 3037e38180eSChris Mason struct btrfs_dir_item * 3047e38180eSChris Mason btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans, 3057e38180eSChris Mason struct btrfs_root *root, 3067e38180eSChris Mason struct btrfs_path *path, u64 dir, 307*e43eec81SSweet Tea Dorminy u64 index, const struct qstr *name, 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 316*e43eec81SSweet Tea Dorminy di = btrfs_lookup_match_dir(trans, root, path, &key, name->name, 317*e43eec81SSweet Tea Dorminy name->len, mod); 3188dcbc261SFilipe Manana if (di == ERR_PTR(-ENOENT)) 3198dcbc261SFilipe Manana return NULL; 3208dcbc261SFilipe Manana 3218dcbc261SFilipe Manana return di; 3227e38180eSChris Mason } 3237e38180eSChris Mason 3244df27c4dSYan, Zheng struct btrfs_dir_item * 325*e43eec81SSweet Tea Dorminy btrfs_search_dir_index_item(struct btrfs_root *root, struct btrfs_path *path, 326*e43eec81SSweet Tea Dorminy u64 dirid, const struct qstr *name) 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 3369dcbe16fSGabriel 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, 341*e43eec81SSweet Tea Dorminy name->name, name->len); 3424df27c4dSYan, Zheng if (di) 3434df27c4dSYan, Zheng return di; 3444df27c4dSYan, Zheng } 3459dcbe16fSGabriel Niebler /* Adjust return code if the key was not found in the next leaf. */ 3469dcbe16fSGabriel Niebler if (ret > 0) 3479dcbe16fSGabriel Niebler ret = 0; 3489dcbe16fSGabriel Niebler 3499dcbe16fSGabriel 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