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); 467fcde0e3SChris Mason } 4754aa1f4dSChris Mason if (ret < 0) 4854aa1f4dSChris Mason return ERR_PTR(ret); 497e38180eSChris Mason WARN_ON(ret > 0); 505f39d397SChris Mason leaf = path->nodes[0]; 515f39d397SChris Mason item = btrfs_item_nr(leaf, path->slots[0]); 527e38180eSChris Mason ptr = btrfs_item_ptr(leaf, path->slots[0], char); 535f39d397SChris Mason BUG_ON(data_size > btrfs_item_size(leaf, item)); 545f39d397SChris Mason ptr += btrfs_item_size(leaf, item) - data_size; 557e38180eSChris Mason return (struct btrfs_dir_item *)ptr; 567fcde0e3SChris Mason } 577fcde0e3SChris Mason 585103e947SJosef Bacik int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans, 595103e947SJosef Bacik struct btrfs_root *root, const char *name, 605103e947SJosef Bacik u16 name_len, const void *data, u16 data_len, 615103e947SJosef Bacik u64 dir) 625103e947SJosef Bacik { 635103e947SJosef Bacik int ret = 0; 645103e947SJosef Bacik struct btrfs_path *path; 655103e947SJosef Bacik struct btrfs_dir_item *dir_item; 665103e947SJosef Bacik unsigned long name_ptr, data_ptr; 675103e947SJosef Bacik struct btrfs_key key, location; 685103e947SJosef Bacik struct btrfs_disk_key disk_key; 695103e947SJosef Bacik struct extent_buffer *leaf; 705103e947SJosef Bacik u32 data_size; 715103e947SJosef Bacik 725103e947SJosef Bacik key.objectid = dir; 735103e947SJosef Bacik btrfs_set_key_type(&key, BTRFS_XATTR_ITEM_KEY); 74df68b8a7SDavid Miller key.offset = btrfs_name_hash(name, name_len); 755103e947SJosef Bacik path = btrfs_alloc_path(); 765103e947SJosef Bacik if (!path) 775103e947SJosef Bacik return -ENOMEM; 78744f52f9SYan if (name_len + data_len + sizeof(struct btrfs_dir_item) > 79744f52f9SYan BTRFS_LEAF_DATA_SIZE(root) - sizeof(struct btrfs_item)) 80744f52f9SYan return -ENOSPC; 815103e947SJosef Bacik 825103e947SJosef Bacik data_size = sizeof(*dir_item) + name_len + data_len; 835103e947SJosef Bacik dir_item = insert_with_overflow(trans, root, path, &key, data_size, 845103e947SJosef Bacik name, name_len); 855103e947SJosef Bacik /* 865103e947SJosef Bacik * FIXME: at some point we should handle xattr's that are larger than 875103e947SJosef Bacik * what we can fit in our leaf. We set location to NULL b/c we arent 885103e947SJosef Bacik * pointing at anything else, that will change if we store the xattr 895103e947SJosef Bacik * data in a separate inode. 905103e947SJosef Bacik */ 915103e947SJosef Bacik BUG_ON(IS_ERR(dir_item)); 925103e947SJosef Bacik memset(&location, 0, sizeof(location)); 935103e947SJosef Bacik 945103e947SJosef Bacik leaf = path->nodes[0]; 955103e947SJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &location); 965103e947SJosef Bacik btrfs_set_dir_item_key(leaf, dir_item, &disk_key); 975103e947SJosef Bacik btrfs_set_dir_type(leaf, dir_item, BTRFS_FT_XATTR); 985103e947SJosef Bacik btrfs_set_dir_name_len(leaf, dir_item, name_len); 995103e947SJosef Bacik btrfs_set_dir_data_len(leaf, dir_item, data_len); 1005103e947SJosef Bacik name_ptr = (unsigned long)(dir_item + 1); 1015103e947SJosef Bacik data_ptr = (unsigned long)((char *)name_ptr + name_len); 1025103e947SJosef Bacik 1035103e947SJosef Bacik write_extent_buffer(leaf, name, name_ptr, name_len); 1045103e947SJosef Bacik write_extent_buffer(leaf, data, data_ptr, data_len); 1055103e947SJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 1065103e947SJosef Bacik 1075103e947SJosef Bacik btrfs_free_path(path); 1085103e947SJosef Bacik return ret; 1095103e947SJosef Bacik } 1105103e947SJosef Bacik 111e089f05cSChris Mason int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root 112d6e4a428SChris Mason *root, const char *name, int name_len, u64 dir, 113d6e4a428SChris Mason struct btrfs_key *location, u8 type) 11462e2749eSChris Mason { 11562e2749eSChris Mason int ret = 0; 116e06afa83SChris Mason int ret2 = 0; 1175caf2a00SChris Mason struct btrfs_path *path; 11862e2749eSChris Mason struct btrfs_dir_item *dir_item; 1195f39d397SChris Mason struct extent_buffer *leaf; 1205f39d397SChris Mason unsigned long name_ptr; 12162e2749eSChris Mason struct btrfs_key key; 1225f39d397SChris Mason struct btrfs_disk_key disk_key; 12362e2749eSChris Mason u32 data_size; 12462e2749eSChris Mason 12562e2749eSChris Mason key.objectid = dir; 1261d4f6404SChris Mason btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY); 127df68b8a7SDavid Miller key.offset = btrfs_name_hash(name, name_len); 1285caf2a00SChris Mason path = btrfs_alloc_path(); 12962e2749eSChris Mason data_size = sizeof(*dir_item) + name_len; 130e06afa83SChris Mason dir_item = insert_with_overflow(trans, root, path, &key, data_size, 131e06afa83SChris Mason name, name_len); 1327e38180eSChris Mason if (IS_ERR(dir_item)) { 1337e38180eSChris Mason ret = PTR_ERR(dir_item); 134e06afa83SChris Mason if (ret == -EEXIST) 135e06afa83SChris Mason goto second_insert; 13662e2749eSChris Mason goto out; 1377e38180eSChris Mason } 13862e2749eSChris Mason 1395f39d397SChris Mason leaf = path->nodes[0]; 1405f39d397SChris Mason btrfs_cpu_key_to_disk(&disk_key, location); 1415f39d397SChris Mason btrfs_set_dir_item_key(leaf, dir_item, &disk_key); 1425f39d397SChris Mason btrfs_set_dir_type(leaf, dir_item, type); 1435103e947SJosef Bacik btrfs_set_dir_data_len(leaf, dir_item, 0); 1445f39d397SChris Mason btrfs_set_dir_name_len(leaf, dir_item, name_len); 1455f39d397SChris Mason name_ptr = (unsigned long)(dir_item + 1); 146c5739bbaSChris Mason 1475f39d397SChris Mason write_extent_buffer(leaf, name, name_ptr, name_len); 1485f39d397SChris Mason btrfs_mark_buffer_dirty(leaf); 1497e38180eSChris Mason 150e06afa83SChris Mason second_insert: 1517e38180eSChris Mason /* FIXME, use some real flag for selecting the extra index */ 1527e38180eSChris Mason if (root == root->fs_info->tree_root) { 1537e38180eSChris Mason ret = 0; 1547e38180eSChris Mason goto out; 1557e38180eSChris Mason } 1565caf2a00SChris Mason btrfs_release_path(root, path); 1577e38180eSChris Mason 1587e38180eSChris Mason btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY); 1597e38180eSChris Mason key.offset = location->objectid; 160e06afa83SChris Mason dir_item = insert_with_overflow(trans, root, path, &key, data_size, 161e06afa83SChris Mason name, name_len); 1627e38180eSChris Mason if (IS_ERR(dir_item)) { 163e06afa83SChris Mason ret2 = PTR_ERR(dir_item); 1647e38180eSChris Mason goto out; 1657e38180eSChris Mason } 1665f39d397SChris Mason leaf = path->nodes[0]; 1675f39d397SChris Mason btrfs_cpu_key_to_disk(&disk_key, location); 1685f39d397SChris Mason btrfs_set_dir_item_key(leaf, dir_item, &disk_key); 1695f39d397SChris Mason btrfs_set_dir_type(leaf, dir_item, type); 1705103e947SJosef Bacik btrfs_set_dir_data_len(leaf, dir_item, 0); 1715f39d397SChris Mason btrfs_set_dir_name_len(leaf, dir_item, name_len); 1725f39d397SChris Mason name_ptr = (unsigned long)(dir_item + 1); 1735f39d397SChris Mason write_extent_buffer(leaf, name, name_ptr, name_len); 1745f39d397SChris Mason btrfs_mark_buffer_dirty(leaf); 1757e38180eSChris Mason out: 1765caf2a00SChris Mason btrfs_free_path(path); 177e06afa83SChris Mason if (ret) 17862e2749eSChris Mason return ret; 179e06afa83SChris Mason if (ret2) 180e06afa83SChris Mason return ret2; 181e06afa83SChris Mason return 0; 18262e2749eSChris Mason } 18362e2749eSChris Mason 1847e38180eSChris Mason struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, 1857e38180eSChris Mason struct btrfs_root *root, 1867e38180eSChris Mason struct btrfs_path *path, u64 dir, 1877e38180eSChris Mason const char *name, int name_len, 1887e38180eSChris Mason int mod) 18962e2749eSChris Mason { 1901d4f6404SChris Mason int ret; 19162e2749eSChris Mason struct btrfs_key key; 1921d4f6404SChris Mason int ins_len = mod < 0 ? -1 : 0; 1931d4f6404SChris Mason int cow = mod != 0; 1945f39d397SChris Mason struct btrfs_key found_key; 1955f39d397SChris Mason struct extent_buffer *leaf; 19662e2749eSChris Mason 19762e2749eSChris Mason key.objectid = dir; 1981d4f6404SChris Mason btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY); 1995f39d397SChris Mason 200df68b8a7SDavid Miller key.offset = btrfs_name_hash(name, name_len); 2015f39d397SChris Mason 202e089f05cSChris Mason ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); 2037fcde0e3SChris Mason if (ret < 0) 2047e38180eSChris Mason return ERR_PTR(ret); 2057fcde0e3SChris Mason if (ret > 0) { 2067fcde0e3SChris Mason if (path->slots[0] == 0) 2077e38180eSChris Mason return NULL; 2087fcde0e3SChris Mason path->slots[0]--; 2097fcde0e3SChris Mason } 2107fcde0e3SChris Mason 2115f39d397SChris Mason leaf = path->nodes[0]; 2125f39d397SChris Mason btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); 2135f39d397SChris Mason 2145f39d397SChris Mason if (found_key.objectid != dir || 2155f39d397SChris Mason btrfs_key_type(&found_key) != BTRFS_DIR_ITEM_KEY || 2165f39d397SChris Mason found_key.offset != key.offset) 2177e38180eSChris Mason return NULL; 2187fcde0e3SChris Mason 2197e38180eSChris Mason return btrfs_match_dir_item_name(root, path, name, name_len); 22062e2749eSChris Mason } 22162e2749eSChris Mason 2227e38180eSChris Mason struct btrfs_dir_item * 2237e38180eSChris Mason btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans, 2247e38180eSChris Mason struct btrfs_root *root, 2257e38180eSChris Mason struct btrfs_path *path, u64 dir, 2267e38180eSChris Mason u64 objectid, const char *name, int name_len, 2277e38180eSChris Mason int mod) 2287e38180eSChris Mason { 2297e38180eSChris Mason int ret; 2307e38180eSChris Mason struct btrfs_key key; 2317e38180eSChris Mason int ins_len = mod < 0 ? -1 : 0; 2327e38180eSChris Mason int cow = mod != 0; 2337e38180eSChris Mason 2347e38180eSChris Mason key.objectid = dir; 2357e38180eSChris Mason btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY); 2367e38180eSChris Mason key.offset = objectid; 2377e38180eSChris Mason 2387e38180eSChris Mason ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); 2397e38180eSChris Mason if (ret < 0) 2407e38180eSChris Mason return ERR_PTR(ret); 2417e38180eSChris Mason if (ret > 0) 2427e38180eSChris Mason return ERR_PTR(-ENOENT); 2437e38180eSChris Mason return btrfs_match_dir_item_name(root, path, name, name_len); 2447e38180eSChris Mason } 2457e38180eSChris Mason 2465103e947SJosef Bacik struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans, 2475103e947SJosef Bacik struct btrfs_root *root, 2485103e947SJosef Bacik struct btrfs_path *path, u64 dir, 2495103e947SJosef Bacik const char *name, u16 name_len, 2505103e947SJosef Bacik int mod) 2515103e947SJosef Bacik { 2525103e947SJosef Bacik int ret; 2535103e947SJosef Bacik struct btrfs_key key; 2545103e947SJosef Bacik int ins_len = mod < 0 ? -1 : 0; 2555103e947SJosef Bacik int cow = mod != 0; 2565103e947SJosef Bacik struct btrfs_key found_key; 2575103e947SJosef Bacik struct extent_buffer *leaf; 2585103e947SJosef Bacik 2595103e947SJosef Bacik key.objectid = dir; 2605103e947SJosef Bacik btrfs_set_key_type(&key, BTRFS_XATTR_ITEM_KEY); 261df68b8a7SDavid Miller key.offset = btrfs_name_hash(name, name_len); 2625103e947SJosef Bacik ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); 2635103e947SJosef Bacik if (ret < 0) 2645103e947SJosef Bacik return ERR_PTR(ret); 2655103e947SJosef Bacik if (ret > 0) { 2665103e947SJosef Bacik if (path->slots[0] == 0) 2675103e947SJosef Bacik return NULL; 2685103e947SJosef Bacik path->slots[0]--; 2695103e947SJosef Bacik } 2705103e947SJosef Bacik 2715103e947SJosef Bacik leaf = path->nodes[0]; 2725103e947SJosef Bacik btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); 2735103e947SJosef Bacik 2745103e947SJosef Bacik if (found_key.objectid != dir || 2755103e947SJosef Bacik btrfs_key_type(&found_key) != BTRFS_XATTR_ITEM_KEY || 2765103e947SJosef Bacik found_key.offset != key.offset) 2775103e947SJosef Bacik return NULL; 2785103e947SJosef Bacik 2795103e947SJosef Bacik return btrfs_match_dir_item_name(root, path, name, name_len); 2805103e947SJosef Bacik } 2815103e947SJosef Bacik 2827e38180eSChris Mason struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root, 2837f5c1516SChris Mason struct btrfs_path *path, 2847f5c1516SChris Mason const char *name, int name_len) 28562e2749eSChris Mason { 28662e2749eSChris Mason struct btrfs_dir_item *dir_item; 2875f39d397SChris Mason unsigned long name_ptr; 2887e38180eSChris Mason u32 total_len; 2897e38180eSChris Mason u32 cur = 0; 2907e38180eSChris Mason u32 this_len; 2915f39d397SChris Mason struct extent_buffer *leaf; 292a8a2ee0cSChris Mason 2935f39d397SChris Mason leaf = path->nodes[0]; 2947e38180eSChris Mason dir_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dir_item); 2955f39d397SChris Mason total_len = btrfs_item_size_nr(leaf, path->slots[0]); 2967e38180eSChris Mason while(cur < total_len) { 2975f39d397SChris Mason this_len = sizeof(*dir_item) + 2985103e947SJosef Bacik btrfs_dir_name_len(leaf, dir_item) + 2995103e947SJosef Bacik btrfs_dir_data_len(leaf, dir_item); 3005f39d397SChris Mason name_ptr = (unsigned long)(dir_item + 1); 3017e38180eSChris Mason 3025f39d397SChris Mason if (btrfs_dir_name_len(leaf, dir_item) == name_len && 3035f39d397SChris Mason memcmp_extent_buffer(leaf, name, name_ptr, name_len) == 0) 3047e38180eSChris Mason return dir_item; 3057e38180eSChris Mason 3067e38180eSChris Mason cur += this_len; 3077e38180eSChris Mason dir_item = (struct btrfs_dir_item *)((char *)dir_item + 3087e38180eSChris Mason this_len); 30962e2749eSChris Mason } 3107e38180eSChris Mason return NULL; 3117e38180eSChris Mason } 3127e38180eSChris Mason 3137e38180eSChris Mason int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans, 3147e38180eSChris Mason struct btrfs_root *root, 3157e38180eSChris Mason struct btrfs_path *path, 3167e38180eSChris Mason struct btrfs_dir_item *di) 3177e38180eSChris Mason { 3187e38180eSChris Mason 3195f39d397SChris Mason struct extent_buffer *leaf; 3207e38180eSChris Mason u32 sub_item_len; 3217e38180eSChris Mason u32 item_len; 32254aa1f4dSChris Mason int ret = 0; 3237e38180eSChris Mason 3245f39d397SChris Mason leaf = path->nodes[0]; 3255103e947SJosef Bacik sub_item_len = sizeof(*di) + btrfs_dir_name_len(leaf, di) + 3265103e947SJosef Bacik btrfs_dir_data_len(leaf, di); 3275f39d397SChris Mason item_len = btrfs_item_size_nr(leaf, path->slots[0]); 3285f39d397SChris Mason if (sub_item_len == item_len) { 3297e38180eSChris Mason ret = btrfs_del_item(trans, root, path); 3307e38180eSChris Mason } else { 3315f39d397SChris Mason /* MARKER */ 3325f39d397SChris Mason unsigned long ptr = (unsigned long)di; 3335f39d397SChris Mason unsigned long start; 3345f39d397SChris Mason 3355f39d397SChris Mason start = btrfs_item_ptr_offset(leaf, path->slots[0]); 3365f39d397SChris Mason memmove_extent_buffer(leaf, ptr, ptr + sub_item_len, 3377e38180eSChris Mason item_len - (ptr + sub_item_len - start)); 3387e38180eSChris Mason ret = btrfs_truncate_item(trans, root, path, 339179e29e4SChris Mason item_len - sub_item_len, 1); 3407e38180eSChris Mason } 3417e38180eSChris Mason return 0; 3427e38180eSChris Mason } 3437e38180eSChris Mason 344