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 2435b7e476SChris Mason static struct btrfs_dir_item *insert_with_overflow(struct btrfs_trans_handle 2535b7e476SChris Mason *trans, 267e38180eSChris Mason struct btrfs_root *root, 277e38180eSChris Mason struct btrfs_path *path, 287e38180eSChris Mason struct btrfs_key *cpu_key, 29e06afa83SChris Mason u32 data_size, 30e06afa83SChris Mason const char *name, 31e06afa83SChris Mason int name_len) 327fcde0e3SChris Mason { 337fcde0e3SChris Mason int ret; 347e38180eSChris Mason char *ptr; 357e38180eSChris Mason struct btrfs_item *item; 365f39d397SChris Mason struct extent_buffer *leaf; 377fcde0e3SChris Mason 387fcde0e3SChris Mason ret = btrfs_insert_empty_item(trans, root, path, cpu_key, data_size); 397e38180eSChris Mason if (ret == -EEXIST) { 40e06afa83SChris Mason struct btrfs_dir_item *di; 41e06afa83SChris Mason di = btrfs_match_dir_item_name(root, path, name, name_len); 42e06afa83SChris Mason if (di) 43e06afa83SChris Mason return ERR_PTR(-EEXIST); 447e38180eSChris Mason ret = btrfs_extend_item(trans, root, path, data_size); 457e38180eSChris Mason WARN_ON(ret > 0); 467e38180eSChris Mason if (ret) 477e38180eSChris Mason return ERR_PTR(ret); 487fcde0e3SChris Mason } 4954aa1f4dSChris Mason if (ret < 0) 5054aa1f4dSChris Mason return ERR_PTR(ret); 517e38180eSChris Mason WARN_ON(ret > 0); 525f39d397SChris Mason leaf = path->nodes[0]; 535f39d397SChris Mason item = btrfs_item_nr(leaf, path->slots[0]); 547e38180eSChris Mason ptr = btrfs_item_ptr(leaf, path->slots[0], char); 555f39d397SChris Mason BUG_ON(data_size > btrfs_item_size(leaf, item)); 565f39d397SChris Mason ptr += btrfs_item_size(leaf, item) - data_size; 577e38180eSChris Mason return (struct btrfs_dir_item *)ptr; 587fcde0e3SChris Mason } 597fcde0e3SChris Mason 60e089f05cSChris Mason int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root 61d6e4a428SChris Mason *root, const char *name, int name_len, u64 dir, 62d6e4a428SChris Mason struct btrfs_key *location, u8 type) 6362e2749eSChris Mason { 6462e2749eSChris Mason int ret = 0; 65e06afa83SChris Mason int ret2 = 0; 665caf2a00SChris Mason struct btrfs_path *path; 6762e2749eSChris Mason struct btrfs_dir_item *dir_item; 685f39d397SChris Mason struct extent_buffer *leaf; 695f39d397SChris Mason unsigned long name_ptr; 7062e2749eSChris Mason struct btrfs_key key; 715f39d397SChris Mason struct btrfs_disk_key disk_key; 7262e2749eSChris Mason u32 data_size; 7362e2749eSChris Mason 7462e2749eSChris Mason key.objectid = dir; 751d4f6404SChris Mason btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY); 7662e2749eSChris Mason ret = btrfs_name_hash(name, name_len, &key.offset); 7762e2749eSChris Mason BUG_ON(ret); 785caf2a00SChris Mason path = btrfs_alloc_path(); 7962e2749eSChris Mason data_size = sizeof(*dir_item) + name_len; 80e06afa83SChris Mason dir_item = insert_with_overflow(trans, root, path, &key, data_size, 81e06afa83SChris Mason name, name_len); 827e38180eSChris Mason if (IS_ERR(dir_item)) { 837e38180eSChris Mason ret = PTR_ERR(dir_item); 84e06afa83SChris Mason if (ret == -EEXIST) 85e06afa83SChris Mason goto second_insert; 8662e2749eSChris Mason goto out; 877e38180eSChris Mason } 8862e2749eSChris Mason 895f39d397SChris Mason leaf = path->nodes[0]; 905f39d397SChris Mason btrfs_cpu_key_to_disk(&disk_key, location); 915f39d397SChris Mason btrfs_set_dir_item_key(leaf, dir_item, &disk_key); 925f39d397SChris Mason btrfs_set_dir_type(leaf, dir_item, type); 935f39d397SChris Mason btrfs_set_dir_flags(leaf, dir_item, 0); 945f39d397SChris Mason btrfs_set_dir_name_len(leaf, dir_item, name_len); 955f39d397SChris Mason name_ptr = (unsigned long)(dir_item + 1); 96c5739bbaSChris Mason 975f39d397SChris Mason write_extent_buffer(leaf, name, name_ptr, name_len); 985f39d397SChris Mason btrfs_mark_buffer_dirty(leaf); 997e38180eSChris Mason 100e06afa83SChris Mason second_insert: 1017e38180eSChris Mason /* FIXME, use some real flag for selecting the extra index */ 1027e38180eSChris Mason if (root == root->fs_info->tree_root) { 1037e38180eSChris Mason ret = 0; 1047e38180eSChris Mason goto out; 1057e38180eSChris Mason } 1065caf2a00SChris Mason btrfs_release_path(root, path); 1077e38180eSChris Mason 1087e38180eSChris Mason btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY); 1097e38180eSChris Mason key.offset = location->objectid; 110e06afa83SChris Mason dir_item = insert_with_overflow(trans, root, path, &key, data_size, 111e06afa83SChris Mason name, name_len); 1127e38180eSChris Mason if (IS_ERR(dir_item)) { 113e06afa83SChris Mason ret2 = PTR_ERR(dir_item); 1147e38180eSChris Mason goto out; 1157e38180eSChris Mason } 1165f39d397SChris Mason leaf = path->nodes[0]; 1175f39d397SChris Mason btrfs_cpu_key_to_disk(&disk_key, location); 1185f39d397SChris Mason btrfs_set_dir_item_key(leaf, dir_item, &disk_key); 1195f39d397SChris Mason btrfs_set_dir_type(leaf, dir_item, type); 1205f39d397SChris Mason btrfs_set_dir_flags(leaf, dir_item, 0); 1215f39d397SChris Mason btrfs_set_dir_name_len(leaf, dir_item, name_len); 1225f39d397SChris Mason name_ptr = (unsigned long)(dir_item + 1); 1235f39d397SChris Mason write_extent_buffer(leaf, name, name_ptr, name_len); 1245f39d397SChris Mason btrfs_mark_buffer_dirty(leaf); 1257e38180eSChris Mason out: 1265caf2a00SChris Mason btrfs_free_path(path); 127e06afa83SChris Mason if (ret) 12862e2749eSChris Mason return ret; 129e06afa83SChris Mason if (ret2) 130e06afa83SChris Mason return ret2; 131e06afa83SChris Mason return 0; 13262e2749eSChris Mason } 13362e2749eSChris Mason 1347e38180eSChris Mason struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, 1357e38180eSChris Mason struct btrfs_root *root, 1367e38180eSChris Mason struct btrfs_path *path, u64 dir, 1377e38180eSChris Mason const char *name, int name_len, 1387e38180eSChris Mason int mod) 13962e2749eSChris Mason { 1401d4f6404SChris Mason int ret; 14162e2749eSChris Mason struct btrfs_key key; 1421d4f6404SChris Mason int ins_len = mod < 0 ? -1 : 0; 1431d4f6404SChris Mason int cow = mod != 0; 1445f39d397SChris Mason struct btrfs_key found_key; 1455f39d397SChris Mason struct extent_buffer *leaf; 14662e2749eSChris Mason 14762e2749eSChris Mason key.objectid = dir; 1481d4f6404SChris Mason btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY); 1495f39d397SChris Mason 15062e2749eSChris Mason ret = btrfs_name_hash(name, name_len, &key.offset); 15162e2749eSChris Mason BUG_ON(ret); 1525f39d397SChris Mason 153e089f05cSChris Mason ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); 1547fcde0e3SChris Mason if (ret < 0) 1557e38180eSChris Mason return ERR_PTR(ret); 1567fcde0e3SChris Mason if (ret > 0) { 1577fcde0e3SChris Mason if (path->slots[0] == 0) 1587e38180eSChris Mason return NULL; 1597fcde0e3SChris Mason path->slots[0]--; 1607fcde0e3SChris Mason } 1617fcde0e3SChris Mason 1625f39d397SChris Mason leaf = path->nodes[0]; 1635f39d397SChris Mason btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); 1645f39d397SChris Mason 1655f39d397SChris Mason if (found_key.objectid != dir || 1665f39d397SChris Mason btrfs_key_type(&found_key) != BTRFS_DIR_ITEM_KEY || 1675f39d397SChris Mason found_key.offset != key.offset) 1687e38180eSChris Mason return NULL; 1697fcde0e3SChris Mason 1707e38180eSChris Mason return btrfs_match_dir_item_name(root, path, name, name_len); 17162e2749eSChris Mason } 17262e2749eSChris Mason 1737e38180eSChris Mason struct btrfs_dir_item * 1747e38180eSChris Mason btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans, 1757e38180eSChris Mason struct btrfs_root *root, 1767e38180eSChris Mason struct btrfs_path *path, u64 dir, 1777e38180eSChris Mason u64 objectid, const char *name, int name_len, 1787e38180eSChris Mason int mod) 1797e38180eSChris Mason { 1807e38180eSChris Mason int ret; 1817e38180eSChris Mason struct btrfs_key key; 1827e38180eSChris Mason int ins_len = mod < 0 ? -1 : 0; 1837e38180eSChris Mason int cow = mod != 0; 1847e38180eSChris Mason 1857e38180eSChris Mason key.objectid = dir; 1867e38180eSChris Mason btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY); 1877e38180eSChris Mason key.offset = objectid; 1887e38180eSChris Mason 1897e38180eSChris Mason ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); 1907e38180eSChris Mason if (ret < 0) 1917e38180eSChris Mason return ERR_PTR(ret); 1927e38180eSChris Mason if (ret > 0) 1937e38180eSChris Mason return ERR_PTR(-ENOENT); 1947e38180eSChris Mason return btrfs_match_dir_item_name(root, path, name, name_len); 1957e38180eSChris Mason } 1967e38180eSChris Mason 1977e38180eSChris Mason struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root, 1987f5c1516SChris Mason struct btrfs_path *path, 1997f5c1516SChris Mason const char *name, int name_len) 20062e2749eSChris Mason { 20162e2749eSChris Mason struct btrfs_dir_item *dir_item; 2025f39d397SChris Mason unsigned long name_ptr; 2037e38180eSChris Mason u32 total_len; 2047e38180eSChris Mason u32 cur = 0; 2057e38180eSChris Mason u32 this_len; 2065f39d397SChris Mason struct extent_buffer *leaf; 207a8a2ee0cSChris Mason 2085f39d397SChris Mason leaf = path->nodes[0]; 2097e38180eSChris Mason dir_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dir_item); 2105f39d397SChris Mason total_len = btrfs_item_size_nr(leaf, path->slots[0]); 2117e38180eSChris Mason while(cur < total_len) { 2125f39d397SChris Mason this_len = sizeof(*dir_item) + 2135f39d397SChris Mason btrfs_dir_name_len(leaf, dir_item); 2145f39d397SChris Mason name_ptr = (unsigned long)(dir_item + 1); 2157e38180eSChris Mason 2165f39d397SChris Mason if (btrfs_dir_name_len(leaf, dir_item) == name_len && 2175f39d397SChris Mason memcmp_extent_buffer(leaf, name, name_ptr, name_len) == 0) 2187e38180eSChris Mason return dir_item; 2197e38180eSChris Mason 2207e38180eSChris Mason cur += this_len; 2217e38180eSChris Mason dir_item = (struct btrfs_dir_item *)((char *)dir_item + 2227e38180eSChris Mason this_len); 22362e2749eSChris Mason } 2247e38180eSChris Mason return NULL; 2257e38180eSChris Mason } 2267e38180eSChris Mason 2277e38180eSChris Mason int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans, 2287e38180eSChris Mason struct btrfs_root *root, 2297e38180eSChris Mason struct btrfs_path *path, 2307e38180eSChris Mason struct btrfs_dir_item *di) 2317e38180eSChris Mason { 2327e38180eSChris Mason 2335f39d397SChris Mason struct extent_buffer *leaf; 2347e38180eSChris Mason u32 sub_item_len; 2357e38180eSChris Mason u32 item_len; 23654aa1f4dSChris Mason int ret = 0; 2377e38180eSChris Mason 2385f39d397SChris Mason leaf = path->nodes[0]; 2395f39d397SChris Mason sub_item_len = sizeof(*di) + btrfs_dir_name_len(leaf, di); 2405f39d397SChris Mason item_len = btrfs_item_size_nr(leaf, path->slots[0]); 2415f39d397SChris Mason if (sub_item_len == item_len) { 2427e38180eSChris Mason ret = btrfs_del_item(trans, root, path); 2437e38180eSChris Mason } else { 2445f39d397SChris Mason /* MARKER */ 2455f39d397SChris Mason unsigned long ptr = (unsigned long)di; 2465f39d397SChris Mason unsigned long start; 2475f39d397SChris Mason 2485f39d397SChris Mason start = btrfs_item_ptr_offset(leaf, path->slots[0]); 2495f39d397SChris Mason memmove_extent_buffer(leaf, ptr, ptr + sub_item_len, 2507e38180eSChris Mason item_len - (ptr + sub_item_len - start)); 2517e38180eSChris Mason ret = btrfs_truncate_item(trans, root, path, 2527e38180eSChris Mason item_len - sub_item_len); 2537e38180eSChris Mason } 2547e38180eSChris Mason return 0; 2557e38180eSChris Mason } 2567e38180eSChris Mason 257