1c1d7c514SDavid Sterba // SPDX-License-Identifier: GPL-2.0 2a5ed9182SOmar Sandoval /* 3a5ed9182SOmar Sandoval * Copyright (C) 2015 Facebook. All rights reserved. 4a5ed9182SOmar Sandoval */ 5a5ed9182SOmar Sandoval 6a5ed9182SOmar Sandoval #include <linux/kernel.h> 725ff17e8SOmar Sandoval #include <linux/sched/mm.h> 8a5ed9182SOmar Sandoval #include "ctree.h" 9a5ed9182SOmar Sandoval #include "disk-io.h" 10a5ed9182SOmar Sandoval #include "locking.h" 11a5ed9182SOmar Sandoval #include "free-space-tree.h" 12a5ed9182SOmar Sandoval #include "transaction.h" 13aac0023cSJosef Bacik #include "block-group.h" 14a5ed9182SOmar Sandoval 15a5ed9182SOmar Sandoval static int __add_block_group_free_space(struct btrfs_trans_handle *trans, 1632da5386SDavid Sterba struct btrfs_block_group *block_group, 17a5ed9182SOmar Sandoval struct btrfs_path *path); 18a5ed9182SOmar Sandoval 197939dd9fSJosef Bacik static struct btrfs_root *btrfs_free_space_root( 207939dd9fSJosef Bacik struct btrfs_block_group *block_group) 217939dd9fSJosef Bacik { 22*abed4aaaSJosef Bacik struct btrfs_key key = { 23*abed4aaaSJosef Bacik .objectid = BTRFS_FREE_SPACE_TREE_OBJECTID, 24*abed4aaaSJosef Bacik .type = BTRFS_ROOT_ITEM_KEY, 25*abed4aaaSJosef Bacik .offset = 0, 26*abed4aaaSJosef Bacik }; 27*abed4aaaSJosef Bacik 28*abed4aaaSJosef Bacik return btrfs_global_root(block_group->fs_info, &key); 297939dd9fSJosef Bacik } 307939dd9fSJosef Bacik 3132da5386SDavid Sterba void set_free_space_tree_thresholds(struct btrfs_block_group *cache) 32a5ed9182SOmar Sandoval { 33a5ed9182SOmar Sandoval u32 bitmap_range; 34a5ed9182SOmar Sandoval size_t bitmap_size; 35a5ed9182SOmar Sandoval u64 num_bitmaps, total_bitmap_size; 36a5ed9182SOmar Sandoval 37e3e39c72SMarcos Paulo de Souza if (WARN_ON(cache->length == 0)) 38e3e39c72SMarcos Paulo de Souza btrfs_warn(cache->fs_info, "block group %llu length is zero", 39e3e39c72SMarcos Paulo de Souza cache->start); 40e3e39c72SMarcos Paulo de Souza 41a5ed9182SOmar Sandoval /* 42a5ed9182SOmar Sandoval * We convert to bitmaps when the disk space required for using extents 43a5ed9182SOmar Sandoval * exceeds that required for using bitmaps. 44a5ed9182SOmar Sandoval */ 45da17066cSJeff Mahoney bitmap_range = cache->fs_info->sectorsize * BTRFS_FREE_SPACE_BITMAP_BITS; 46b3470b5dSDavid Sterba num_bitmaps = div_u64(cache->length + bitmap_range - 1, bitmap_range); 47a5ed9182SOmar Sandoval bitmap_size = sizeof(struct btrfs_item) + BTRFS_FREE_SPACE_BITMAP_SIZE; 48a5ed9182SOmar Sandoval total_bitmap_size = num_bitmaps * bitmap_size; 49a5ed9182SOmar Sandoval cache->bitmap_high_thresh = div_u64(total_bitmap_size, 50a5ed9182SOmar Sandoval sizeof(struct btrfs_item)); 51a5ed9182SOmar Sandoval 52a5ed9182SOmar Sandoval /* 53a5ed9182SOmar Sandoval * We allow for a small buffer between the high threshold and low 54a5ed9182SOmar Sandoval * threshold to avoid thrashing back and forth between the two formats. 55a5ed9182SOmar Sandoval */ 56a5ed9182SOmar Sandoval if (cache->bitmap_high_thresh > 100) 57a5ed9182SOmar Sandoval cache->bitmap_low_thresh = cache->bitmap_high_thresh - 100; 58a5ed9182SOmar Sandoval else 59a5ed9182SOmar Sandoval cache->bitmap_low_thresh = 0; 60a5ed9182SOmar Sandoval } 61a5ed9182SOmar Sandoval 62a5ed9182SOmar Sandoval static int add_new_free_space_info(struct btrfs_trans_handle *trans, 6332da5386SDavid Sterba struct btrfs_block_group *block_group, 64a5ed9182SOmar Sandoval struct btrfs_path *path) 65a5ed9182SOmar Sandoval { 667939dd9fSJosef Bacik struct btrfs_root *root = btrfs_free_space_root(block_group); 67a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 68a5ed9182SOmar Sandoval struct btrfs_key key; 69a5ed9182SOmar Sandoval struct extent_buffer *leaf; 70a5ed9182SOmar Sandoval int ret; 71a5ed9182SOmar Sandoval 72b3470b5dSDavid Sterba key.objectid = block_group->start; 73a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_INFO_KEY; 74b3470b5dSDavid Sterba key.offset = block_group->length; 75a5ed9182SOmar Sandoval 76a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(*info)); 77a5ed9182SOmar Sandoval if (ret) 78a5ed9182SOmar Sandoval goto out; 79a5ed9182SOmar Sandoval 80a5ed9182SOmar Sandoval leaf = path->nodes[0]; 81a5ed9182SOmar Sandoval info = btrfs_item_ptr(leaf, path->slots[0], 82a5ed9182SOmar Sandoval struct btrfs_free_space_info); 83a5ed9182SOmar Sandoval btrfs_set_free_space_extent_count(leaf, info, 0); 84a5ed9182SOmar Sandoval btrfs_set_free_space_flags(leaf, info, 0); 85a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 86a5ed9182SOmar Sandoval 87a5ed9182SOmar Sandoval ret = 0; 88a5ed9182SOmar Sandoval out: 89a5ed9182SOmar Sandoval btrfs_release_path(path); 90a5ed9182SOmar Sandoval return ret; 91a5ed9182SOmar Sandoval } 92a5ed9182SOmar Sandoval 93ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 94ce9f967fSJohannes Thumshirn struct btrfs_free_space_info *search_free_space_info( 952ccf545eSDavid Sterba struct btrfs_trans_handle *trans, 9632da5386SDavid Sterba struct btrfs_block_group *block_group, 97a5ed9182SOmar Sandoval struct btrfs_path *path, int cow) 98a5ed9182SOmar Sandoval { 992ccf545eSDavid Sterba struct btrfs_fs_info *fs_info = block_group->fs_info; 1007939dd9fSJosef Bacik struct btrfs_root *root = btrfs_free_space_root(block_group); 101a5ed9182SOmar Sandoval struct btrfs_key key; 102a5ed9182SOmar Sandoval int ret; 103a5ed9182SOmar Sandoval 104b3470b5dSDavid Sterba key.objectid = block_group->start; 105a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_INFO_KEY; 106b3470b5dSDavid Sterba key.offset = block_group->length; 107a5ed9182SOmar Sandoval 108a5ed9182SOmar Sandoval ret = btrfs_search_slot(trans, root, &key, path, 0, cow); 109a5ed9182SOmar Sandoval if (ret < 0) 110a5ed9182SOmar Sandoval return ERR_PTR(ret); 111a5ed9182SOmar Sandoval if (ret != 0) { 112ab8d0fc4SJeff Mahoney btrfs_warn(fs_info, "missing free space info for %llu", 113b3470b5dSDavid Sterba block_group->start); 114a5ed9182SOmar Sandoval ASSERT(0); 115a5ed9182SOmar Sandoval return ERR_PTR(-ENOENT); 116a5ed9182SOmar Sandoval } 117a5ed9182SOmar Sandoval 118a5ed9182SOmar Sandoval return btrfs_item_ptr(path->nodes[0], path->slots[0], 119a5ed9182SOmar Sandoval struct btrfs_free_space_info); 120a5ed9182SOmar Sandoval } 121a5ed9182SOmar Sandoval 122a5ed9182SOmar Sandoval /* 123a5ed9182SOmar Sandoval * btrfs_search_slot() but we're looking for the greatest key less than the 124a5ed9182SOmar Sandoval * passed key. 125a5ed9182SOmar Sandoval */ 126a5ed9182SOmar Sandoval static int btrfs_search_prev_slot(struct btrfs_trans_handle *trans, 127a5ed9182SOmar Sandoval struct btrfs_root *root, 128a5ed9182SOmar Sandoval struct btrfs_key *key, struct btrfs_path *p, 129a5ed9182SOmar Sandoval int ins_len, int cow) 130a5ed9182SOmar Sandoval { 131a5ed9182SOmar Sandoval int ret; 132a5ed9182SOmar Sandoval 133a5ed9182SOmar Sandoval ret = btrfs_search_slot(trans, root, key, p, ins_len, cow); 134a5ed9182SOmar Sandoval if (ret < 0) 135a5ed9182SOmar Sandoval return ret; 136a5ed9182SOmar Sandoval 137a5ed9182SOmar Sandoval if (ret == 0) { 138a5ed9182SOmar Sandoval ASSERT(0); 139a5ed9182SOmar Sandoval return -EIO; 140a5ed9182SOmar Sandoval } 141a5ed9182SOmar Sandoval 142a5ed9182SOmar Sandoval if (p->slots[0] == 0) { 143a5ed9182SOmar Sandoval ASSERT(0); 144a5ed9182SOmar Sandoval return -EIO; 145a5ed9182SOmar Sandoval } 146a5ed9182SOmar Sandoval p->slots[0]--; 147a5ed9182SOmar Sandoval 148a5ed9182SOmar Sandoval return 0; 149a5ed9182SOmar Sandoval } 150a5ed9182SOmar Sandoval 151098e6308SDavid Sterba static inline u32 free_space_bitmap_size(const struct btrfs_fs_info *fs_info, 152098e6308SDavid Sterba u64 size) 153a5ed9182SOmar Sandoval { 154098e6308SDavid Sterba return DIV_ROUND_UP(size >> fs_info->sectorsize_bits, BITS_PER_BYTE); 155a5ed9182SOmar Sandoval } 156a5ed9182SOmar Sandoval 157a565971fSHoward McLauchlan static unsigned long *alloc_bitmap(u32 bitmap_size) 158a5ed9182SOmar Sandoval { 159a565971fSHoward McLauchlan unsigned long *ret; 16025ff17e8SOmar Sandoval unsigned int nofs_flag; 161a565971fSHoward McLauchlan u32 bitmap_rounded_size = round_up(bitmap_size, sizeof(unsigned long)); 16279b134a2SDavid Sterba 16379b134a2SDavid Sterba /* 16425ff17e8SOmar Sandoval * GFP_NOFS doesn't work with kvmalloc(), but we really can't recurse 16525ff17e8SOmar Sandoval * into the filesystem as the free space bitmap can be modified in the 16625ff17e8SOmar Sandoval * critical section of a transaction commit. 16725ff17e8SOmar Sandoval * 16825ff17e8SOmar Sandoval * TODO: push the memalloc_nofs_{save,restore}() to the caller where we 16925ff17e8SOmar Sandoval * know that recursion is unsafe. 17079b134a2SDavid Sterba */ 17125ff17e8SOmar Sandoval nofs_flag = memalloc_nofs_save(); 172a565971fSHoward McLauchlan ret = kvzalloc(bitmap_rounded_size, GFP_KERNEL); 17325ff17e8SOmar Sandoval memalloc_nofs_restore(nofs_flag); 17425ff17e8SOmar Sandoval return ret; 175a5ed9182SOmar Sandoval } 176a5ed9182SOmar Sandoval 177a565971fSHoward McLauchlan static void le_bitmap_set(unsigned long *map, unsigned int start, int len) 1786faa8f47SHoward McLauchlan { 179a565971fSHoward McLauchlan u8 *p = ((u8 *)map) + BIT_BYTE(start); 1806faa8f47SHoward McLauchlan const unsigned int size = start + len; 1816faa8f47SHoward McLauchlan int bits_to_set = BITS_PER_BYTE - (start % BITS_PER_BYTE); 1826faa8f47SHoward McLauchlan u8 mask_to_set = BITMAP_FIRST_BYTE_MASK(start); 1836faa8f47SHoward McLauchlan 1846faa8f47SHoward McLauchlan while (len - bits_to_set >= 0) { 1856faa8f47SHoward McLauchlan *p |= mask_to_set; 1866faa8f47SHoward McLauchlan len -= bits_to_set; 1876faa8f47SHoward McLauchlan bits_to_set = BITS_PER_BYTE; 1886faa8f47SHoward McLauchlan mask_to_set = ~0; 1896faa8f47SHoward McLauchlan p++; 1906faa8f47SHoward McLauchlan } 1916faa8f47SHoward McLauchlan if (len) { 1926faa8f47SHoward McLauchlan mask_to_set &= BITMAP_LAST_BYTE_MASK(size); 1936faa8f47SHoward McLauchlan *p |= mask_to_set; 1946faa8f47SHoward McLauchlan } 1956faa8f47SHoward McLauchlan } 1966faa8f47SHoward McLauchlan 197ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 198a5ed9182SOmar Sandoval int convert_free_space_to_bitmaps(struct btrfs_trans_handle *trans, 19932da5386SDavid Sterba struct btrfs_block_group *block_group, 200a5ed9182SOmar Sandoval struct btrfs_path *path) 201a5ed9182SOmar Sandoval { 202719fb4deSNikolay Borisov struct btrfs_fs_info *fs_info = trans->fs_info; 2037939dd9fSJosef Bacik struct btrfs_root *root = btrfs_free_space_root(block_group); 204a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 205a5ed9182SOmar Sandoval struct btrfs_key key, found_key; 206a5ed9182SOmar Sandoval struct extent_buffer *leaf; 207a565971fSHoward McLauchlan unsigned long *bitmap; 208a565971fSHoward McLauchlan char *bitmap_cursor; 209a5ed9182SOmar Sandoval u64 start, end; 210a5ed9182SOmar Sandoval u64 bitmap_range, i; 211a5ed9182SOmar Sandoval u32 bitmap_size, flags, expected_extent_count; 212a5ed9182SOmar Sandoval u32 extent_count = 0; 213a5ed9182SOmar Sandoval int done = 0, nr; 214a5ed9182SOmar Sandoval int ret; 215a5ed9182SOmar Sandoval 216098e6308SDavid Sterba bitmap_size = free_space_bitmap_size(fs_info, block_group->length); 217a5ed9182SOmar Sandoval bitmap = alloc_bitmap(bitmap_size); 218a5ed9182SOmar Sandoval if (!bitmap) { 219a5ed9182SOmar Sandoval ret = -ENOMEM; 220a5ed9182SOmar Sandoval goto out; 221a5ed9182SOmar Sandoval } 222a5ed9182SOmar Sandoval 223b3470b5dSDavid Sterba start = block_group->start; 224b3470b5dSDavid Sterba end = block_group->start + block_group->length; 225a5ed9182SOmar Sandoval 226a5ed9182SOmar Sandoval key.objectid = end - 1; 227a5ed9182SOmar Sandoval key.type = (u8)-1; 228a5ed9182SOmar Sandoval key.offset = (u64)-1; 229a5ed9182SOmar Sandoval 230a5ed9182SOmar Sandoval while (!done) { 231a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 232a5ed9182SOmar Sandoval if (ret) 233a5ed9182SOmar Sandoval goto out; 234a5ed9182SOmar Sandoval 235a5ed9182SOmar Sandoval leaf = path->nodes[0]; 236a5ed9182SOmar Sandoval nr = 0; 237a5ed9182SOmar Sandoval path->slots[0]++; 238a5ed9182SOmar Sandoval while (path->slots[0] > 0) { 239a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0] - 1); 240a5ed9182SOmar Sandoval 241a5ed9182SOmar Sandoval if (found_key.type == BTRFS_FREE_SPACE_INFO_KEY) { 242b3470b5dSDavid Sterba ASSERT(found_key.objectid == block_group->start); 243b3470b5dSDavid Sterba ASSERT(found_key.offset == block_group->length); 244a5ed9182SOmar Sandoval done = 1; 245a5ed9182SOmar Sandoval break; 246a5ed9182SOmar Sandoval } else if (found_key.type == BTRFS_FREE_SPACE_EXTENT_KEY) { 247a5ed9182SOmar Sandoval u64 first, last; 248a5ed9182SOmar Sandoval 249a5ed9182SOmar Sandoval ASSERT(found_key.objectid >= start); 250a5ed9182SOmar Sandoval ASSERT(found_key.objectid < end); 251a5ed9182SOmar Sandoval ASSERT(found_key.objectid + found_key.offset <= end); 252a5ed9182SOmar Sandoval 253a5ed9182SOmar Sandoval first = div_u64(found_key.objectid - start, 2540b246afaSJeff Mahoney fs_info->sectorsize); 255a5ed9182SOmar Sandoval last = div_u64(found_key.objectid + found_key.offset - start, 2560b246afaSJeff Mahoney fs_info->sectorsize); 2572fe1d551SOmar Sandoval le_bitmap_set(bitmap, first, last - first); 258a5ed9182SOmar Sandoval 259a5ed9182SOmar Sandoval extent_count++; 260a5ed9182SOmar Sandoval nr++; 261a5ed9182SOmar Sandoval path->slots[0]--; 262a5ed9182SOmar Sandoval } else { 263a5ed9182SOmar Sandoval ASSERT(0); 264a5ed9182SOmar Sandoval } 265a5ed9182SOmar Sandoval } 266a5ed9182SOmar Sandoval 267a5ed9182SOmar Sandoval ret = btrfs_del_items(trans, root, path, path->slots[0], nr); 268a5ed9182SOmar Sandoval if (ret) 269a5ed9182SOmar Sandoval goto out; 270a5ed9182SOmar Sandoval btrfs_release_path(path); 271a5ed9182SOmar Sandoval } 272a5ed9182SOmar Sandoval 2732ccf545eSDavid Sterba info = search_free_space_info(trans, block_group, path, 1); 274a5ed9182SOmar Sandoval if (IS_ERR(info)) { 275a5ed9182SOmar Sandoval ret = PTR_ERR(info); 276a5ed9182SOmar Sandoval goto out; 277a5ed9182SOmar Sandoval } 278a5ed9182SOmar Sandoval leaf = path->nodes[0]; 279a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(leaf, info); 280a5ed9182SOmar Sandoval flags |= BTRFS_FREE_SPACE_USING_BITMAPS; 281a5ed9182SOmar Sandoval btrfs_set_free_space_flags(leaf, info, flags); 282a5ed9182SOmar Sandoval expected_extent_count = btrfs_free_space_extent_count(leaf, info); 283a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 284a5ed9182SOmar Sandoval btrfs_release_path(path); 285a5ed9182SOmar Sandoval 286a5ed9182SOmar Sandoval if (extent_count != expected_extent_count) { 2875d163e0eSJeff Mahoney btrfs_err(fs_info, 2885d163e0eSJeff Mahoney "incorrect extent count for %llu; counted %u, expected %u", 289b3470b5dSDavid Sterba block_group->start, extent_count, 290a5ed9182SOmar Sandoval expected_extent_count); 291a5ed9182SOmar Sandoval ASSERT(0); 292a5ed9182SOmar Sandoval ret = -EIO; 293a5ed9182SOmar Sandoval goto out; 294a5ed9182SOmar Sandoval } 295a5ed9182SOmar Sandoval 296a565971fSHoward McLauchlan bitmap_cursor = (char *)bitmap; 2970b246afaSJeff Mahoney bitmap_range = fs_info->sectorsize * BTRFS_FREE_SPACE_BITMAP_BITS; 298a5ed9182SOmar Sandoval i = start; 299a5ed9182SOmar Sandoval while (i < end) { 300a5ed9182SOmar Sandoval unsigned long ptr; 301a5ed9182SOmar Sandoval u64 extent_size; 302a5ed9182SOmar Sandoval u32 data_size; 303a5ed9182SOmar Sandoval 304a5ed9182SOmar Sandoval extent_size = min(end - i, bitmap_range); 305098e6308SDavid Sterba data_size = free_space_bitmap_size(fs_info, extent_size); 306a5ed9182SOmar Sandoval 307a5ed9182SOmar Sandoval key.objectid = i; 308a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_BITMAP_KEY; 309a5ed9182SOmar Sandoval key.offset = extent_size; 310a5ed9182SOmar Sandoval 311a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, 312a5ed9182SOmar Sandoval data_size); 313a5ed9182SOmar Sandoval if (ret) 314a5ed9182SOmar Sandoval goto out; 315a5ed9182SOmar Sandoval 316a5ed9182SOmar Sandoval leaf = path->nodes[0]; 317a5ed9182SOmar Sandoval ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); 318a5ed9182SOmar Sandoval write_extent_buffer(leaf, bitmap_cursor, ptr, 319a5ed9182SOmar Sandoval data_size); 320a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 321a5ed9182SOmar Sandoval btrfs_release_path(path); 322a5ed9182SOmar Sandoval 323a5ed9182SOmar Sandoval i += extent_size; 324a5ed9182SOmar Sandoval bitmap_cursor += data_size; 325a5ed9182SOmar Sandoval } 326a5ed9182SOmar Sandoval 327a5ed9182SOmar Sandoval ret = 0; 328a5ed9182SOmar Sandoval out: 32979b134a2SDavid Sterba kvfree(bitmap); 330a5ed9182SOmar Sandoval if (ret) 33166642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 332a5ed9182SOmar Sandoval return ret; 333a5ed9182SOmar Sandoval } 334a5ed9182SOmar Sandoval 335ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 336a5ed9182SOmar Sandoval int convert_free_space_to_extents(struct btrfs_trans_handle *trans, 33732da5386SDavid Sterba struct btrfs_block_group *block_group, 338a5ed9182SOmar Sandoval struct btrfs_path *path) 339a5ed9182SOmar Sandoval { 3405296c2bfSNikolay Borisov struct btrfs_fs_info *fs_info = trans->fs_info; 3417939dd9fSJosef Bacik struct btrfs_root *root = btrfs_free_space_root(block_group); 342a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 343a5ed9182SOmar Sandoval struct btrfs_key key, found_key; 344a5ed9182SOmar Sandoval struct extent_buffer *leaf; 345a565971fSHoward McLauchlan unsigned long *bitmap; 346a5ed9182SOmar Sandoval u64 start, end; 347a5ed9182SOmar Sandoval u32 bitmap_size, flags, expected_extent_count; 348a565971fSHoward McLauchlan unsigned long nrbits, start_bit, end_bit; 349a5ed9182SOmar Sandoval u32 extent_count = 0; 350a5ed9182SOmar Sandoval int done = 0, nr; 351a5ed9182SOmar Sandoval int ret; 352a5ed9182SOmar Sandoval 353098e6308SDavid Sterba bitmap_size = free_space_bitmap_size(fs_info, block_group->length); 354a5ed9182SOmar Sandoval bitmap = alloc_bitmap(bitmap_size); 355a5ed9182SOmar Sandoval if (!bitmap) { 356a5ed9182SOmar Sandoval ret = -ENOMEM; 357a5ed9182SOmar Sandoval goto out; 358a5ed9182SOmar Sandoval } 359a5ed9182SOmar Sandoval 360b3470b5dSDavid Sterba start = block_group->start; 361b3470b5dSDavid Sterba end = block_group->start + block_group->length; 362a5ed9182SOmar Sandoval 363a5ed9182SOmar Sandoval key.objectid = end - 1; 364a5ed9182SOmar Sandoval key.type = (u8)-1; 365a5ed9182SOmar Sandoval key.offset = (u64)-1; 366a5ed9182SOmar Sandoval 367a5ed9182SOmar Sandoval while (!done) { 368a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 369a5ed9182SOmar Sandoval if (ret) 370a5ed9182SOmar Sandoval goto out; 371a5ed9182SOmar Sandoval 372a5ed9182SOmar Sandoval leaf = path->nodes[0]; 373a5ed9182SOmar Sandoval nr = 0; 374a5ed9182SOmar Sandoval path->slots[0]++; 375a5ed9182SOmar Sandoval while (path->slots[0] > 0) { 376a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0] - 1); 377a5ed9182SOmar Sandoval 378a5ed9182SOmar Sandoval if (found_key.type == BTRFS_FREE_SPACE_INFO_KEY) { 379b3470b5dSDavid Sterba ASSERT(found_key.objectid == block_group->start); 380b3470b5dSDavid Sterba ASSERT(found_key.offset == block_group->length); 381a5ed9182SOmar Sandoval done = 1; 382a5ed9182SOmar Sandoval break; 383a5ed9182SOmar Sandoval } else if (found_key.type == BTRFS_FREE_SPACE_BITMAP_KEY) { 384a5ed9182SOmar Sandoval unsigned long ptr; 385a565971fSHoward McLauchlan char *bitmap_cursor; 386a5ed9182SOmar Sandoval u32 bitmap_pos, data_size; 387a5ed9182SOmar Sandoval 388a5ed9182SOmar Sandoval ASSERT(found_key.objectid >= start); 389a5ed9182SOmar Sandoval ASSERT(found_key.objectid < end); 390a5ed9182SOmar Sandoval ASSERT(found_key.objectid + found_key.offset <= end); 391a5ed9182SOmar Sandoval 392a5ed9182SOmar Sandoval bitmap_pos = div_u64(found_key.objectid - start, 3930b246afaSJeff Mahoney fs_info->sectorsize * 394a5ed9182SOmar Sandoval BITS_PER_BYTE); 395a565971fSHoward McLauchlan bitmap_cursor = ((char *)bitmap) + bitmap_pos; 396098e6308SDavid Sterba data_size = free_space_bitmap_size(fs_info, 397098e6308SDavid Sterba found_key.offset); 398a5ed9182SOmar Sandoval 399a5ed9182SOmar Sandoval ptr = btrfs_item_ptr_offset(leaf, path->slots[0] - 1); 400a5ed9182SOmar Sandoval read_extent_buffer(leaf, bitmap_cursor, ptr, 401a5ed9182SOmar Sandoval data_size); 402a5ed9182SOmar Sandoval 403a5ed9182SOmar Sandoval nr++; 404a5ed9182SOmar Sandoval path->slots[0]--; 405a5ed9182SOmar Sandoval } else { 406a5ed9182SOmar Sandoval ASSERT(0); 407a5ed9182SOmar Sandoval } 408a5ed9182SOmar Sandoval } 409a5ed9182SOmar Sandoval 410a5ed9182SOmar Sandoval ret = btrfs_del_items(trans, root, path, path->slots[0], nr); 411a5ed9182SOmar Sandoval if (ret) 412a5ed9182SOmar Sandoval goto out; 413a5ed9182SOmar Sandoval btrfs_release_path(path); 414a5ed9182SOmar Sandoval } 415a5ed9182SOmar Sandoval 4162ccf545eSDavid Sterba info = search_free_space_info(trans, block_group, path, 1); 417a5ed9182SOmar Sandoval if (IS_ERR(info)) { 418a5ed9182SOmar Sandoval ret = PTR_ERR(info); 419a5ed9182SOmar Sandoval goto out; 420a5ed9182SOmar Sandoval } 421a5ed9182SOmar Sandoval leaf = path->nodes[0]; 422a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(leaf, info); 423a5ed9182SOmar Sandoval flags &= ~BTRFS_FREE_SPACE_USING_BITMAPS; 424a5ed9182SOmar Sandoval btrfs_set_free_space_flags(leaf, info, flags); 425a5ed9182SOmar Sandoval expected_extent_count = btrfs_free_space_extent_count(leaf, info); 426a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 427a5ed9182SOmar Sandoval btrfs_release_path(path); 428a5ed9182SOmar Sandoval 429ab108d99SDavid Sterba nrbits = block_group->length >> block_group->fs_info->sectorsize_bits; 430a565971fSHoward McLauchlan start_bit = find_next_bit_le(bitmap, nrbits, 0); 431a565971fSHoward McLauchlan 432a565971fSHoward McLauchlan while (start_bit < nrbits) { 433a565971fSHoward McLauchlan end_bit = find_next_zero_bit_le(bitmap, nrbits, start_bit); 434a565971fSHoward McLauchlan ASSERT(start_bit < end_bit); 435a565971fSHoward McLauchlan 436a565971fSHoward McLauchlan key.objectid = start + start_bit * block_group->fs_info->sectorsize; 437a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_EXTENT_KEY; 438a565971fSHoward McLauchlan key.offset = (end_bit - start_bit) * block_group->fs_info->sectorsize; 439a5ed9182SOmar Sandoval 440a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, 0); 441a5ed9182SOmar Sandoval if (ret) 442a5ed9182SOmar Sandoval goto out; 443a5ed9182SOmar Sandoval btrfs_release_path(path); 444a5ed9182SOmar Sandoval 445a5ed9182SOmar Sandoval extent_count++; 446a5ed9182SOmar Sandoval 447a565971fSHoward McLauchlan start_bit = find_next_bit_le(bitmap, nrbits, end_bit); 448a5ed9182SOmar Sandoval } 449a5ed9182SOmar Sandoval 450a5ed9182SOmar Sandoval if (extent_count != expected_extent_count) { 4515d163e0eSJeff Mahoney btrfs_err(fs_info, 4525d163e0eSJeff Mahoney "incorrect extent count for %llu; counted %u, expected %u", 453b3470b5dSDavid Sterba block_group->start, extent_count, 454a5ed9182SOmar Sandoval expected_extent_count); 455a5ed9182SOmar Sandoval ASSERT(0); 456a5ed9182SOmar Sandoval ret = -EIO; 457a5ed9182SOmar Sandoval goto out; 458a5ed9182SOmar Sandoval } 459a5ed9182SOmar Sandoval 460a5ed9182SOmar Sandoval ret = 0; 461a5ed9182SOmar Sandoval out: 46279b134a2SDavid Sterba kvfree(bitmap); 463a5ed9182SOmar Sandoval if (ret) 46466642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 465a5ed9182SOmar Sandoval return ret; 466a5ed9182SOmar Sandoval } 467a5ed9182SOmar Sandoval 468a5ed9182SOmar Sandoval static int update_free_space_extent_count(struct btrfs_trans_handle *trans, 46932da5386SDavid Sterba struct btrfs_block_group *block_group, 470a5ed9182SOmar Sandoval struct btrfs_path *path, 471a5ed9182SOmar Sandoval int new_extents) 472a5ed9182SOmar Sandoval { 473a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 474a5ed9182SOmar Sandoval u32 flags; 475a5ed9182SOmar Sandoval u32 extent_count; 476a5ed9182SOmar Sandoval int ret = 0; 477a5ed9182SOmar Sandoval 478a5ed9182SOmar Sandoval if (new_extents == 0) 479a5ed9182SOmar Sandoval return 0; 480a5ed9182SOmar Sandoval 4812ccf545eSDavid Sterba info = search_free_space_info(trans, block_group, path, 1); 482a5ed9182SOmar Sandoval if (IS_ERR(info)) { 483a5ed9182SOmar Sandoval ret = PTR_ERR(info); 484a5ed9182SOmar Sandoval goto out; 485a5ed9182SOmar Sandoval } 486a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(path->nodes[0], info); 487a5ed9182SOmar Sandoval extent_count = btrfs_free_space_extent_count(path->nodes[0], info); 488a5ed9182SOmar Sandoval 489a5ed9182SOmar Sandoval extent_count += new_extents; 490a5ed9182SOmar Sandoval btrfs_set_free_space_extent_count(path->nodes[0], info, extent_count); 491a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(path->nodes[0]); 492a5ed9182SOmar Sandoval btrfs_release_path(path); 493a5ed9182SOmar Sandoval 494a5ed9182SOmar Sandoval if (!(flags & BTRFS_FREE_SPACE_USING_BITMAPS) && 495a5ed9182SOmar Sandoval extent_count > block_group->bitmap_high_thresh) { 496719fb4deSNikolay Borisov ret = convert_free_space_to_bitmaps(trans, block_group, path); 497a5ed9182SOmar Sandoval } else if ((flags & BTRFS_FREE_SPACE_USING_BITMAPS) && 498a5ed9182SOmar Sandoval extent_count < block_group->bitmap_low_thresh) { 4995296c2bfSNikolay Borisov ret = convert_free_space_to_extents(trans, block_group, path); 500a5ed9182SOmar Sandoval } 501a5ed9182SOmar Sandoval 502a5ed9182SOmar Sandoval out: 503a5ed9182SOmar Sandoval return ret; 504a5ed9182SOmar Sandoval } 505a5ed9182SOmar Sandoval 506ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 50732da5386SDavid Sterba int free_space_test_bit(struct btrfs_block_group *block_group, 508a5ed9182SOmar Sandoval struct btrfs_path *path, u64 offset) 509a5ed9182SOmar Sandoval { 510a5ed9182SOmar Sandoval struct extent_buffer *leaf; 511a5ed9182SOmar Sandoval struct btrfs_key key; 512a5ed9182SOmar Sandoval u64 found_start, found_end; 513a5ed9182SOmar Sandoval unsigned long ptr, i; 514a5ed9182SOmar Sandoval 515a5ed9182SOmar Sandoval leaf = path->nodes[0]; 516a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); 517a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_BITMAP_KEY); 518a5ed9182SOmar Sandoval 519a5ed9182SOmar Sandoval found_start = key.objectid; 520a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 521a5ed9182SOmar Sandoval ASSERT(offset >= found_start && offset < found_end); 522a5ed9182SOmar Sandoval 523a5ed9182SOmar Sandoval ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); 524da17066cSJeff Mahoney i = div_u64(offset - found_start, 525da17066cSJeff Mahoney block_group->fs_info->sectorsize); 526a5ed9182SOmar Sandoval return !!extent_buffer_test_bit(leaf, ptr, i); 527a5ed9182SOmar Sandoval } 528a5ed9182SOmar Sandoval 52932da5386SDavid Sterba static void free_space_set_bits(struct btrfs_block_group *block_group, 530a5ed9182SOmar Sandoval struct btrfs_path *path, u64 *start, u64 *size, 531a5ed9182SOmar Sandoval int bit) 532a5ed9182SOmar Sandoval { 5330b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = block_group->fs_info; 534a5ed9182SOmar Sandoval struct extent_buffer *leaf; 535a5ed9182SOmar Sandoval struct btrfs_key key; 536a5ed9182SOmar Sandoval u64 end = *start + *size; 537a5ed9182SOmar Sandoval u64 found_start, found_end; 538a5ed9182SOmar Sandoval unsigned long ptr, first, last; 539a5ed9182SOmar Sandoval 540a5ed9182SOmar Sandoval leaf = path->nodes[0]; 541a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); 542a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_BITMAP_KEY); 543a5ed9182SOmar Sandoval 544a5ed9182SOmar Sandoval found_start = key.objectid; 545a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 546a5ed9182SOmar Sandoval ASSERT(*start >= found_start && *start < found_end); 547a5ed9182SOmar Sandoval ASSERT(end > found_start); 548a5ed9182SOmar Sandoval 549a5ed9182SOmar Sandoval if (end > found_end) 550a5ed9182SOmar Sandoval end = found_end; 551a5ed9182SOmar Sandoval 552a5ed9182SOmar Sandoval ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); 553ab108d99SDavid Sterba first = (*start - found_start) >> fs_info->sectorsize_bits; 554ab108d99SDavid Sterba last = (end - found_start) >> fs_info->sectorsize_bits; 555a5ed9182SOmar Sandoval if (bit) 556a5ed9182SOmar Sandoval extent_buffer_bitmap_set(leaf, ptr, first, last - first); 557a5ed9182SOmar Sandoval else 558a5ed9182SOmar Sandoval extent_buffer_bitmap_clear(leaf, ptr, first, last - first); 559a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 560a5ed9182SOmar Sandoval 561a5ed9182SOmar Sandoval *size -= end - *start; 562a5ed9182SOmar Sandoval *start = end; 563a5ed9182SOmar Sandoval } 564a5ed9182SOmar Sandoval 565a5ed9182SOmar Sandoval /* 566a5ed9182SOmar Sandoval * We can't use btrfs_next_item() in modify_free_space_bitmap() because 567a5ed9182SOmar Sandoval * btrfs_next_leaf() doesn't get the path for writing. We can forgo the fancy 568a5ed9182SOmar Sandoval * tree walking in btrfs_next_leaf() anyways because we know exactly what we're 569a5ed9182SOmar Sandoval * looking for. 570a5ed9182SOmar Sandoval */ 571a5ed9182SOmar Sandoval static int free_space_next_bitmap(struct btrfs_trans_handle *trans, 572a5ed9182SOmar Sandoval struct btrfs_root *root, struct btrfs_path *p) 573a5ed9182SOmar Sandoval { 574a5ed9182SOmar Sandoval struct btrfs_key key; 575a5ed9182SOmar Sandoval 576a5ed9182SOmar Sandoval if (p->slots[0] + 1 < btrfs_header_nritems(p->nodes[0])) { 577a5ed9182SOmar Sandoval p->slots[0]++; 578a5ed9182SOmar Sandoval return 0; 579a5ed9182SOmar Sandoval } 580a5ed9182SOmar Sandoval 581a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(p->nodes[0], &key, p->slots[0]); 582a5ed9182SOmar Sandoval btrfs_release_path(p); 583a5ed9182SOmar Sandoval 584a5ed9182SOmar Sandoval key.objectid += key.offset; 585a5ed9182SOmar Sandoval key.type = (u8)-1; 586a5ed9182SOmar Sandoval key.offset = (u64)-1; 587a5ed9182SOmar Sandoval 588a5ed9182SOmar Sandoval return btrfs_search_prev_slot(trans, root, &key, p, 0, 1); 589a5ed9182SOmar Sandoval } 590a5ed9182SOmar Sandoval 591a5ed9182SOmar Sandoval /* 592a5ed9182SOmar Sandoval * If remove is 1, then we are removing free space, thus clearing bits in the 593a5ed9182SOmar Sandoval * bitmap. If remove is 0, then we are adding free space, thus setting bits in 594a5ed9182SOmar Sandoval * the bitmap. 595a5ed9182SOmar Sandoval */ 596a5ed9182SOmar Sandoval static int modify_free_space_bitmap(struct btrfs_trans_handle *trans, 59732da5386SDavid Sterba struct btrfs_block_group *block_group, 598a5ed9182SOmar Sandoval struct btrfs_path *path, 599a5ed9182SOmar Sandoval u64 start, u64 size, int remove) 600a5ed9182SOmar Sandoval { 6017939dd9fSJosef Bacik struct btrfs_root *root = btrfs_free_space_root(block_group); 602a5ed9182SOmar Sandoval struct btrfs_key key; 603a5ed9182SOmar Sandoval u64 end = start + size; 604a5ed9182SOmar Sandoval u64 cur_start, cur_size; 605a5ed9182SOmar Sandoval int prev_bit, next_bit; 606a5ed9182SOmar Sandoval int new_extents; 607a5ed9182SOmar Sandoval int ret; 608a5ed9182SOmar Sandoval 609a5ed9182SOmar Sandoval /* 610a5ed9182SOmar Sandoval * Read the bit for the block immediately before the extent of space if 611a5ed9182SOmar Sandoval * that block is within the block group. 612a5ed9182SOmar Sandoval */ 613b3470b5dSDavid Sterba if (start > block_group->start) { 614da17066cSJeff Mahoney u64 prev_block = start - block_group->fs_info->sectorsize; 615a5ed9182SOmar Sandoval 616a5ed9182SOmar Sandoval key.objectid = prev_block; 617a5ed9182SOmar Sandoval key.type = (u8)-1; 618a5ed9182SOmar Sandoval key.offset = (u64)-1; 619a5ed9182SOmar Sandoval 620a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, 0, 1); 621a5ed9182SOmar Sandoval if (ret) 622a5ed9182SOmar Sandoval goto out; 623a5ed9182SOmar Sandoval 624a5ed9182SOmar Sandoval prev_bit = free_space_test_bit(block_group, path, prev_block); 625a5ed9182SOmar Sandoval 626a5ed9182SOmar Sandoval /* The previous block may have been in the previous bitmap. */ 627a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 628a5ed9182SOmar Sandoval if (start >= key.objectid + key.offset) { 629a5ed9182SOmar Sandoval ret = free_space_next_bitmap(trans, root, path); 630a5ed9182SOmar Sandoval if (ret) 631a5ed9182SOmar Sandoval goto out; 632a5ed9182SOmar Sandoval } 633a5ed9182SOmar Sandoval } else { 634a5ed9182SOmar Sandoval key.objectid = start; 635a5ed9182SOmar Sandoval key.type = (u8)-1; 636a5ed9182SOmar Sandoval key.offset = (u64)-1; 637a5ed9182SOmar Sandoval 638a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, 0, 1); 639a5ed9182SOmar Sandoval if (ret) 640a5ed9182SOmar Sandoval goto out; 641a5ed9182SOmar Sandoval 642a5ed9182SOmar Sandoval prev_bit = -1; 643a5ed9182SOmar Sandoval } 644a5ed9182SOmar Sandoval 645a5ed9182SOmar Sandoval /* 646a5ed9182SOmar Sandoval * Iterate over all of the bitmaps overlapped by the extent of space, 647a5ed9182SOmar Sandoval * clearing/setting bits as required. 648a5ed9182SOmar Sandoval */ 649a5ed9182SOmar Sandoval cur_start = start; 650a5ed9182SOmar Sandoval cur_size = size; 651a5ed9182SOmar Sandoval while (1) { 652a5ed9182SOmar Sandoval free_space_set_bits(block_group, path, &cur_start, &cur_size, 653a5ed9182SOmar Sandoval !remove); 654a5ed9182SOmar Sandoval if (cur_size == 0) 655a5ed9182SOmar Sandoval break; 656a5ed9182SOmar Sandoval ret = free_space_next_bitmap(trans, root, path); 657a5ed9182SOmar Sandoval if (ret) 658a5ed9182SOmar Sandoval goto out; 659a5ed9182SOmar Sandoval } 660a5ed9182SOmar Sandoval 661a5ed9182SOmar Sandoval /* 662a5ed9182SOmar Sandoval * Read the bit for the block immediately after the extent of space if 663a5ed9182SOmar Sandoval * that block is within the block group. 664a5ed9182SOmar Sandoval */ 665b3470b5dSDavid Sterba if (end < block_group->start + block_group->length) { 666a5ed9182SOmar Sandoval /* The next block may be in the next bitmap. */ 667a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 668a5ed9182SOmar Sandoval if (end >= key.objectid + key.offset) { 669a5ed9182SOmar Sandoval ret = free_space_next_bitmap(trans, root, path); 670a5ed9182SOmar Sandoval if (ret) 671a5ed9182SOmar Sandoval goto out; 672a5ed9182SOmar Sandoval } 673a5ed9182SOmar Sandoval 674a5ed9182SOmar Sandoval next_bit = free_space_test_bit(block_group, path, end); 675a5ed9182SOmar Sandoval } else { 676a5ed9182SOmar Sandoval next_bit = -1; 677a5ed9182SOmar Sandoval } 678a5ed9182SOmar Sandoval 679a5ed9182SOmar Sandoval if (remove) { 680a5ed9182SOmar Sandoval new_extents = -1; 681a5ed9182SOmar Sandoval if (prev_bit == 1) { 682a5ed9182SOmar Sandoval /* Leftover on the left. */ 683a5ed9182SOmar Sandoval new_extents++; 684a5ed9182SOmar Sandoval } 685a5ed9182SOmar Sandoval if (next_bit == 1) { 686a5ed9182SOmar Sandoval /* Leftover on the right. */ 687a5ed9182SOmar Sandoval new_extents++; 688a5ed9182SOmar Sandoval } 689a5ed9182SOmar Sandoval } else { 690a5ed9182SOmar Sandoval new_extents = 1; 691a5ed9182SOmar Sandoval if (prev_bit == 1) { 692a5ed9182SOmar Sandoval /* Merging with neighbor on the left. */ 693a5ed9182SOmar Sandoval new_extents--; 694a5ed9182SOmar Sandoval } 695a5ed9182SOmar Sandoval if (next_bit == 1) { 696a5ed9182SOmar Sandoval /* Merging with neighbor on the right. */ 697a5ed9182SOmar Sandoval new_extents--; 698a5ed9182SOmar Sandoval } 699a5ed9182SOmar Sandoval } 700a5ed9182SOmar Sandoval 701a5ed9182SOmar Sandoval btrfs_release_path(path); 702690d7682SNikolay Borisov ret = update_free_space_extent_count(trans, block_group, path, 703a5ed9182SOmar Sandoval new_extents); 704a5ed9182SOmar Sandoval 705a5ed9182SOmar Sandoval out: 706a5ed9182SOmar Sandoval return ret; 707a5ed9182SOmar Sandoval } 708a5ed9182SOmar Sandoval 709a5ed9182SOmar Sandoval static int remove_free_space_extent(struct btrfs_trans_handle *trans, 71032da5386SDavid Sterba struct btrfs_block_group *block_group, 711a5ed9182SOmar Sandoval struct btrfs_path *path, 712a5ed9182SOmar Sandoval u64 start, u64 size) 713a5ed9182SOmar Sandoval { 7147939dd9fSJosef Bacik struct btrfs_root *root = btrfs_free_space_root(block_group); 715a5ed9182SOmar Sandoval struct btrfs_key key; 716a5ed9182SOmar Sandoval u64 found_start, found_end; 717a5ed9182SOmar Sandoval u64 end = start + size; 718a5ed9182SOmar Sandoval int new_extents = -1; 719a5ed9182SOmar Sandoval int ret; 720a5ed9182SOmar Sandoval 721a5ed9182SOmar Sandoval key.objectid = start; 722a5ed9182SOmar Sandoval key.type = (u8)-1; 723a5ed9182SOmar Sandoval key.offset = (u64)-1; 724a5ed9182SOmar Sandoval 725a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 726a5ed9182SOmar Sandoval if (ret) 727a5ed9182SOmar Sandoval goto out; 728a5ed9182SOmar Sandoval 729a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 730a5ed9182SOmar Sandoval 731a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_EXTENT_KEY); 732a5ed9182SOmar Sandoval 733a5ed9182SOmar Sandoval found_start = key.objectid; 734a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 735a5ed9182SOmar Sandoval ASSERT(start >= found_start && end <= found_end); 736a5ed9182SOmar Sandoval 737a5ed9182SOmar Sandoval /* 738a5ed9182SOmar Sandoval * Okay, now that we've found the free space extent which contains the 739a5ed9182SOmar Sandoval * free space that we are removing, there are four cases: 740a5ed9182SOmar Sandoval * 741a5ed9182SOmar Sandoval * 1. We're using the whole extent: delete the key we found and 742a5ed9182SOmar Sandoval * decrement the free space extent count. 743a5ed9182SOmar Sandoval * 2. We are using part of the extent starting at the beginning: delete 744a5ed9182SOmar Sandoval * the key we found and insert a new key representing the leftover at 745a5ed9182SOmar Sandoval * the end. There is no net change in the number of extents. 746a5ed9182SOmar Sandoval * 3. We are using part of the extent ending at the end: delete the key 747a5ed9182SOmar Sandoval * we found and insert a new key representing the leftover at the 748a5ed9182SOmar Sandoval * beginning. There is no net change in the number of extents. 749a5ed9182SOmar Sandoval * 4. We are using part of the extent in the middle: delete the key we 750a5ed9182SOmar Sandoval * found and insert two new keys representing the leftovers on each 751a5ed9182SOmar Sandoval * side. Where we used to have one extent, we now have two, so increment 752a5ed9182SOmar Sandoval * the extent count. We may need to convert the block group to bitmaps 753a5ed9182SOmar Sandoval * as a result. 754a5ed9182SOmar Sandoval */ 755a5ed9182SOmar Sandoval 756a5ed9182SOmar Sandoval /* Delete the existing key (cases 1-4). */ 757a5ed9182SOmar Sandoval ret = btrfs_del_item(trans, root, path); 758a5ed9182SOmar Sandoval if (ret) 759a5ed9182SOmar Sandoval goto out; 760a5ed9182SOmar Sandoval 761a5ed9182SOmar Sandoval /* Add a key for leftovers at the beginning (cases 3 and 4). */ 762a5ed9182SOmar Sandoval if (start > found_start) { 763a5ed9182SOmar Sandoval key.objectid = found_start; 764a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_EXTENT_KEY; 765a5ed9182SOmar Sandoval key.offset = start - found_start; 766a5ed9182SOmar Sandoval 767a5ed9182SOmar Sandoval btrfs_release_path(path); 768a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, 0); 769a5ed9182SOmar Sandoval if (ret) 770a5ed9182SOmar Sandoval goto out; 771a5ed9182SOmar Sandoval new_extents++; 772a5ed9182SOmar Sandoval } 773a5ed9182SOmar Sandoval 774a5ed9182SOmar Sandoval /* Add a key for leftovers at the end (cases 2 and 4). */ 775a5ed9182SOmar Sandoval if (end < found_end) { 776a5ed9182SOmar Sandoval key.objectid = end; 777a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_EXTENT_KEY; 778a5ed9182SOmar Sandoval key.offset = found_end - end; 779a5ed9182SOmar Sandoval 780a5ed9182SOmar Sandoval btrfs_release_path(path); 781a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, 0); 782a5ed9182SOmar Sandoval if (ret) 783a5ed9182SOmar Sandoval goto out; 784a5ed9182SOmar Sandoval new_extents++; 785a5ed9182SOmar Sandoval } 786a5ed9182SOmar Sandoval 787a5ed9182SOmar Sandoval btrfs_release_path(path); 788690d7682SNikolay Borisov ret = update_free_space_extent_count(trans, block_group, path, 789a5ed9182SOmar Sandoval new_extents); 790a5ed9182SOmar Sandoval 791a5ed9182SOmar Sandoval out: 792a5ed9182SOmar Sandoval return ret; 793a5ed9182SOmar Sandoval } 794a5ed9182SOmar Sandoval 795ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 796a5ed9182SOmar Sandoval int __remove_from_free_space_tree(struct btrfs_trans_handle *trans, 79732da5386SDavid Sterba struct btrfs_block_group *block_group, 798a5ed9182SOmar Sandoval struct btrfs_path *path, u64 start, u64 size) 799a5ed9182SOmar Sandoval { 800a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 801a5ed9182SOmar Sandoval u32 flags; 802a5ed9182SOmar Sandoval int ret; 803a5ed9182SOmar Sandoval 804a5ed9182SOmar Sandoval if (block_group->needs_free_space) { 8059a7e0f92SNikolay Borisov ret = __add_block_group_free_space(trans, block_group, path); 806a5ed9182SOmar Sandoval if (ret) 807a5ed9182SOmar Sandoval return ret; 808a5ed9182SOmar Sandoval } 809a5ed9182SOmar Sandoval 8102ccf545eSDavid Sterba info = search_free_space_info(NULL, block_group, path, 0); 811a5ed9182SOmar Sandoval if (IS_ERR(info)) 812a5ed9182SOmar Sandoval return PTR_ERR(info); 813a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(path->nodes[0], info); 814a5ed9182SOmar Sandoval btrfs_release_path(path); 815a5ed9182SOmar Sandoval 816a5ed9182SOmar Sandoval if (flags & BTRFS_FREE_SPACE_USING_BITMAPS) { 81785a7ef13SNikolay Borisov return modify_free_space_bitmap(trans, block_group, path, 81885a7ef13SNikolay Borisov start, size, 1); 819a5ed9182SOmar Sandoval } else { 820e581168dSNikolay Borisov return remove_free_space_extent(trans, block_group, path, 821e581168dSNikolay Borisov start, size); 822a5ed9182SOmar Sandoval } 823a5ed9182SOmar Sandoval } 824a5ed9182SOmar Sandoval 825a5ed9182SOmar Sandoval int remove_from_free_space_tree(struct btrfs_trans_handle *trans, 826a5ed9182SOmar Sandoval u64 start, u64 size) 827a5ed9182SOmar Sandoval { 82832da5386SDavid Sterba struct btrfs_block_group *block_group; 829a5ed9182SOmar Sandoval struct btrfs_path *path; 830a5ed9182SOmar Sandoval int ret; 831a5ed9182SOmar Sandoval 83225a356d3SNikolay Borisov if (!btrfs_fs_compat_ro(trans->fs_info, FREE_SPACE_TREE)) 833a5ed9182SOmar Sandoval return 0; 834a5ed9182SOmar Sandoval 835a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 836a5ed9182SOmar Sandoval if (!path) { 837a5ed9182SOmar Sandoval ret = -ENOMEM; 838a5ed9182SOmar Sandoval goto out; 839a5ed9182SOmar Sandoval } 840a5ed9182SOmar Sandoval 84125a356d3SNikolay Borisov block_group = btrfs_lookup_block_group(trans->fs_info, start); 842a5ed9182SOmar Sandoval if (!block_group) { 843a5ed9182SOmar Sandoval ASSERT(0); 844a5ed9182SOmar Sandoval ret = -ENOENT; 845a5ed9182SOmar Sandoval goto out; 846a5ed9182SOmar Sandoval } 847a5ed9182SOmar Sandoval 848a5ed9182SOmar Sandoval mutex_lock(&block_group->free_space_lock); 849c31683a6SNikolay Borisov ret = __remove_from_free_space_tree(trans, block_group, path, start, 850c31683a6SNikolay Borisov size); 851a5ed9182SOmar Sandoval mutex_unlock(&block_group->free_space_lock); 852a5ed9182SOmar Sandoval 853a5ed9182SOmar Sandoval btrfs_put_block_group(block_group); 854a5ed9182SOmar Sandoval out: 855a5ed9182SOmar Sandoval btrfs_free_path(path); 856a5ed9182SOmar Sandoval if (ret) 85766642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 858a5ed9182SOmar Sandoval return ret; 859a5ed9182SOmar Sandoval } 860a5ed9182SOmar Sandoval 861a5ed9182SOmar Sandoval static int add_free_space_extent(struct btrfs_trans_handle *trans, 86232da5386SDavid Sterba struct btrfs_block_group *block_group, 863a5ed9182SOmar Sandoval struct btrfs_path *path, 864a5ed9182SOmar Sandoval u64 start, u64 size) 865a5ed9182SOmar Sandoval { 8667939dd9fSJosef Bacik struct btrfs_root *root = btrfs_free_space_root(block_group); 867a5ed9182SOmar Sandoval struct btrfs_key key, new_key; 868a5ed9182SOmar Sandoval u64 found_start, found_end; 869a5ed9182SOmar Sandoval u64 end = start + size; 870a5ed9182SOmar Sandoval int new_extents = 1; 871a5ed9182SOmar Sandoval int ret; 872a5ed9182SOmar Sandoval 873a5ed9182SOmar Sandoval /* 874a5ed9182SOmar Sandoval * We are adding a new extent of free space, but we need to merge 875a5ed9182SOmar Sandoval * extents. There are four cases here: 876a5ed9182SOmar Sandoval * 877a5ed9182SOmar Sandoval * 1. The new extent does not have any immediate neighbors to merge 878a5ed9182SOmar Sandoval * with: add the new key and increment the free space extent count. We 879a5ed9182SOmar Sandoval * may need to convert the block group to bitmaps as a result. 880a5ed9182SOmar Sandoval * 2. The new extent has an immediate neighbor before it: remove the 881a5ed9182SOmar Sandoval * previous key and insert a new key combining both of them. There is no 882a5ed9182SOmar Sandoval * net change in the number of extents. 883a5ed9182SOmar Sandoval * 3. The new extent has an immediate neighbor after it: remove the next 884a5ed9182SOmar Sandoval * key and insert a new key combining both of them. There is no net 885a5ed9182SOmar Sandoval * change in the number of extents. 886a5ed9182SOmar Sandoval * 4. The new extent has immediate neighbors on both sides: remove both 887a5ed9182SOmar Sandoval * of the keys and insert a new key combining all of them. Where we used 888a5ed9182SOmar Sandoval * to have two extents, we now have one, so decrement the extent count. 889a5ed9182SOmar Sandoval */ 890a5ed9182SOmar Sandoval 891a5ed9182SOmar Sandoval new_key.objectid = start; 892a5ed9182SOmar Sandoval new_key.type = BTRFS_FREE_SPACE_EXTENT_KEY; 893a5ed9182SOmar Sandoval new_key.offset = size; 894a5ed9182SOmar Sandoval 895a5ed9182SOmar Sandoval /* Search for a neighbor on the left. */ 896b3470b5dSDavid Sterba if (start == block_group->start) 897a5ed9182SOmar Sandoval goto right; 898a5ed9182SOmar Sandoval key.objectid = start - 1; 899a5ed9182SOmar Sandoval key.type = (u8)-1; 900a5ed9182SOmar Sandoval key.offset = (u64)-1; 901a5ed9182SOmar Sandoval 902a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 903a5ed9182SOmar Sandoval if (ret) 904a5ed9182SOmar Sandoval goto out; 905a5ed9182SOmar Sandoval 906a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 907a5ed9182SOmar Sandoval 908a5ed9182SOmar Sandoval if (key.type != BTRFS_FREE_SPACE_EXTENT_KEY) { 909a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_INFO_KEY); 910a5ed9182SOmar Sandoval btrfs_release_path(path); 911a5ed9182SOmar Sandoval goto right; 912a5ed9182SOmar Sandoval } 913a5ed9182SOmar Sandoval 914a5ed9182SOmar Sandoval found_start = key.objectid; 915a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 916b3470b5dSDavid Sterba ASSERT(found_start >= block_group->start && 917b3470b5dSDavid Sterba found_end > block_group->start); 918a5ed9182SOmar Sandoval ASSERT(found_start < start && found_end <= start); 919a5ed9182SOmar Sandoval 920a5ed9182SOmar Sandoval /* 921a5ed9182SOmar Sandoval * Delete the neighbor on the left and absorb it into the new key (cases 922a5ed9182SOmar Sandoval * 2 and 4). 923a5ed9182SOmar Sandoval */ 924a5ed9182SOmar Sandoval if (found_end == start) { 925a5ed9182SOmar Sandoval ret = btrfs_del_item(trans, root, path); 926a5ed9182SOmar Sandoval if (ret) 927a5ed9182SOmar Sandoval goto out; 928a5ed9182SOmar Sandoval new_key.objectid = found_start; 929a5ed9182SOmar Sandoval new_key.offset += key.offset; 930a5ed9182SOmar Sandoval new_extents--; 931a5ed9182SOmar Sandoval } 932a5ed9182SOmar Sandoval btrfs_release_path(path); 933a5ed9182SOmar Sandoval 934a5ed9182SOmar Sandoval right: 935a5ed9182SOmar Sandoval /* Search for a neighbor on the right. */ 936b3470b5dSDavid Sterba if (end == block_group->start + block_group->length) 937a5ed9182SOmar Sandoval goto insert; 938a5ed9182SOmar Sandoval key.objectid = end; 939a5ed9182SOmar Sandoval key.type = (u8)-1; 940a5ed9182SOmar Sandoval key.offset = (u64)-1; 941a5ed9182SOmar Sandoval 942a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 943a5ed9182SOmar Sandoval if (ret) 944a5ed9182SOmar Sandoval goto out; 945a5ed9182SOmar Sandoval 946a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 947a5ed9182SOmar Sandoval 948a5ed9182SOmar Sandoval if (key.type != BTRFS_FREE_SPACE_EXTENT_KEY) { 949a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_INFO_KEY); 950a5ed9182SOmar Sandoval btrfs_release_path(path); 951a5ed9182SOmar Sandoval goto insert; 952a5ed9182SOmar Sandoval } 953a5ed9182SOmar Sandoval 954a5ed9182SOmar Sandoval found_start = key.objectid; 955a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 956b3470b5dSDavid Sterba ASSERT(found_start >= block_group->start && 957b3470b5dSDavid Sterba found_end > block_group->start); 958a5ed9182SOmar Sandoval ASSERT((found_start < start && found_end <= start) || 959a5ed9182SOmar Sandoval (found_start >= end && found_end > end)); 960a5ed9182SOmar Sandoval 961a5ed9182SOmar Sandoval /* 962a5ed9182SOmar Sandoval * Delete the neighbor on the right and absorb it into the new key 963a5ed9182SOmar Sandoval * (cases 3 and 4). 964a5ed9182SOmar Sandoval */ 965a5ed9182SOmar Sandoval if (found_start == end) { 966a5ed9182SOmar Sandoval ret = btrfs_del_item(trans, root, path); 967a5ed9182SOmar Sandoval if (ret) 968a5ed9182SOmar Sandoval goto out; 969a5ed9182SOmar Sandoval new_key.offset += key.offset; 970a5ed9182SOmar Sandoval new_extents--; 971a5ed9182SOmar Sandoval } 972a5ed9182SOmar Sandoval btrfs_release_path(path); 973a5ed9182SOmar Sandoval 974a5ed9182SOmar Sandoval insert: 975a5ed9182SOmar Sandoval /* Insert the new key (cases 1-4). */ 976a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &new_key, 0); 977a5ed9182SOmar Sandoval if (ret) 978a5ed9182SOmar Sandoval goto out; 979a5ed9182SOmar Sandoval 980a5ed9182SOmar Sandoval btrfs_release_path(path); 981690d7682SNikolay Borisov ret = update_free_space_extent_count(trans, block_group, path, 982a5ed9182SOmar Sandoval new_extents); 983a5ed9182SOmar Sandoval 984a5ed9182SOmar Sandoval out: 985a5ed9182SOmar Sandoval return ret; 986a5ed9182SOmar Sandoval } 987a5ed9182SOmar Sandoval 988ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 989a5ed9182SOmar Sandoval int __add_to_free_space_tree(struct btrfs_trans_handle *trans, 99032da5386SDavid Sterba struct btrfs_block_group *block_group, 991a5ed9182SOmar Sandoval struct btrfs_path *path, u64 start, u64 size) 992a5ed9182SOmar Sandoval { 993a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 994a5ed9182SOmar Sandoval u32 flags; 995a5ed9182SOmar Sandoval int ret; 996a5ed9182SOmar Sandoval 997a5ed9182SOmar Sandoval if (block_group->needs_free_space) { 9989a7e0f92SNikolay Borisov ret = __add_block_group_free_space(trans, block_group, path); 999a5ed9182SOmar Sandoval if (ret) 1000a5ed9182SOmar Sandoval return ret; 1001a5ed9182SOmar Sandoval } 1002a5ed9182SOmar Sandoval 10032ccf545eSDavid Sterba info = search_free_space_info(NULL, block_group, path, 0); 1004a5ed9182SOmar Sandoval if (IS_ERR(info)) 1005a5ed9182SOmar Sandoval return PTR_ERR(info); 1006a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(path->nodes[0], info); 1007a5ed9182SOmar Sandoval btrfs_release_path(path); 1008a5ed9182SOmar Sandoval 1009a5ed9182SOmar Sandoval if (flags & BTRFS_FREE_SPACE_USING_BITMAPS) { 101085a7ef13SNikolay Borisov return modify_free_space_bitmap(trans, block_group, path, 101185a7ef13SNikolay Borisov start, size, 0); 1012a5ed9182SOmar Sandoval } else { 10135cb17822SNikolay Borisov return add_free_space_extent(trans, block_group, path, start, 10145cb17822SNikolay Borisov size); 1015a5ed9182SOmar Sandoval } 1016a5ed9182SOmar Sandoval } 1017a5ed9182SOmar Sandoval 1018a5ed9182SOmar Sandoval int add_to_free_space_tree(struct btrfs_trans_handle *trans, 1019a5ed9182SOmar Sandoval u64 start, u64 size) 1020a5ed9182SOmar Sandoval { 102132da5386SDavid Sterba struct btrfs_block_group *block_group; 1022a5ed9182SOmar Sandoval struct btrfs_path *path; 1023a5ed9182SOmar Sandoval int ret; 1024a5ed9182SOmar Sandoval 1025e7355e50SNikolay Borisov if (!btrfs_fs_compat_ro(trans->fs_info, FREE_SPACE_TREE)) 1026a5ed9182SOmar Sandoval return 0; 1027a5ed9182SOmar Sandoval 1028a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1029a5ed9182SOmar Sandoval if (!path) { 1030a5ed9182SOmar Sandoval ret = -ENOMEM; 1031a5ed9182SOmar Sandoval goto out; 1032a5ed9182SOmar Sandoval } 1033a5ed9182SOmar Sandoval 1034e7355e50SNikolay Borisov block_group = btrfs_lookup_block_group(trans->fs_info, start); 1035a5ed9182SOmar Sandoval if (!block_group) { 1036a5ed9182SOmar Sandoval ASSERT(0); 1037a5ed9182SOmar Sandoval ret = -ENOENT; 1038a5ed9182SOmar Sandoval goto out; 1039a5ed9182SOmar Sandoval } 1040a5ed9182SOmar Sandoval 1041a5ed9182SOmar Sandoval mutex_lock(&block_group->free_space_lock); 10422d5cffa1SNikolay Borisov ret = __add_to_free_space_tree(trans, block_group, path, start, size); 1043a5ed9182SOmar Sandoval mutex_unlock(&block_group->free_space_lock); 1044a5ed9182SOmar Sandoval 1045a5ed9182SOmar Sandoval btrfs_put_block_group(block_group); 1046a5ed9182SOmar Sandoval out: 1047a5ed9182SOmar Sandoval btrfs_free_path(path); 1048a5ed9182SOmar Sandoval if (ret) 104966642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 1050a5ed9182SOmar Sandoval return ret; 1051a5ed9182SOmar Sandoval } 1052a5ed9182SOmar Sandoval 1053a5ed9182SOmar Sandoval /* 1054a5ed9182SOmar Sandoval * Populate the free space tree by walking the extent tree. Operations on the 1055a5ed9182SOmar Sandoval * extent tree that happen as a result of writes to the free space tree will go 1056a5ed9182SOmar Sandoval * through the normal add/remove hooks. 1057a5ed9182SOmar Sandoval */ 1058a5ed9182SOmar Sandoval static int populate_free_space_tree(struct btrfs_trans_handle *trans, 105932da5386SDavid Sterba struct btrfs_block_group *block_group) 1060a5ed9182SOmar Sandoval { 106129cbcf40SJosef Bacik struct btrfs_root *extent_root; 1062a5ed9182SOmar Sandoval struct btrfs_path *path, *path2; 1063a5ed9182SOmar Sandoval struct btrfs_key key; 1064a5ed9182SOmar Sandoval u64 start, end; 1065a5ed9182SOmar Sandoval int ret; 1066a5ed9182SOmar Sandoval 1067a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1068a5ed9182SOmar Sandoval if (!path) 1069a5ed9182SOmar Sandoval return -ENOMEM; 1070019599adSGu Jinxiang path->reada = READA_FORWARD; 1071a5ed9182SOmar Sandoval 1072a5ed9182SOmar Sandoval path2 = btrfs_alloc_path(); 1073a5ed9182SOmar Sandoval if (!path2) { 1074a5ed9182SOmar Sandoval btrfs_free_path(path); 1075a5ed9182SOmar Sandoval return -ENOMEM; 1076a5ed9182SOmar Sandoval } 1077a5ed9182SOmar Sandoval 107866afee18SNikolay Borisov ret = add_new_free_space_info(trans, block_group, path2); 1079a5ed9182SOmar Sandoval if (ret) 1080a5ed9182SOmar Sandoval goto out; 1081a5ed9182SOmar Sandoval 1082511711afSChris Mason mutex_lock(&block_group->free_space_lock); 1083511711afSChris Mason 1084a5ed9182SOmar Sandoval /* 1085a5ed9182SOmar Sandoval * Iterate through all of the extent and metadata items in this block 1086a5ed9182SOmar Sandoval * group, adding the free space between them and the free space at the 1087a5ed9182SOmar Sandoval * end. Note that EXTENT_ITEM and METADATA_ITEM are less than 1088a5ed9182SOmar Sandoval * BLOCK_GROUP_ITEM, so an extent may precede the block group that it's 1089a5ed9182SOmar Sandoval * contained in. 1090a5ed9182SOmar Sandoval */ 1091b3470b5dSDavid Sterba key.objectid = block_group->start; 1092a5ed9182SOmar Sandoval key.type = BTRFS_EXTENT_ITEM_KEY; 1093a5ed9182SOmar Sandoval key.offset = 0; 1094a5ed9182SOmar Sandoval 109529cbcf40SJosef Bacik extent_root = btrfs_extent_root(trans->fs_info, key.objectid); 1096a5ed9182SOmar Sandoval ret = btrfs_search_slot_for_read(extent_root, &key, path, 1, 0); 1097a5ed9182SOmar Sandoval if (ret < 0) 1098511711afSChris Mason goto out_locked; 1099a5ed9182SOmar Sandoval ASSERT(ret == 0); 1100a5ed9182SOmar Sandoval 1101b3470b5dSDavid Sterba start = block_group->start; 1102b3470b5dSDavid Sterba end = block_group->start + block_group->length; 1103a5ed9182SOmar Sandoval while (1) { 1104a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 1105a5ed9182SOmar Sandoval 1106a5ed9182SOmar Sandoval if (key.type == BTRFS_EXTENT_ITEM_KEY || 1107a5ed9182SOmar Sandoval key.type == BTRFS_METADATA_ITEM_KEY) { 1108a5ed9182SOmar Sandoval if (key.objectid >= end) 1109a5ed9182SOmar Sandoval break; 1110a5ed9182SOmar Sandoval 1111a5ed9182SOmar Sandoval if (start < key.objectid) { 11122d5cffa1SNikolay Borisov ret = __add_to_free_space_tree(trans, 1113a5ed9182SOmar Sandoval block_group, 1114a5ed9182SOmar Sandoval path2, start, 1115a5ed9182SOmar Sandoval key.objectid - 1116a5ed9182SOmar Sandoval start); 1117a5ed9182SOmar Sandoval if (ret) 1118511711afSChris Mason goto out_locked; 1119a5ed9182SOmar Sandoval } 1120a5ed9182SOmar Sandoval start = key.objectid; 1121a5ed9182SOmar Sandoval if (key.type == BTRFS_METADATA_ITEM_KEY) 1122ffa9a9efSNikolay Borisov start += trans->fs_info->nodesize; 1123a5ed9182SOmar Sandoval else 1124a5ed9182SOmar Sandoval start += key.offset; 1125a5ed9182SOmar Sandoval } else if (key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { 1126b3470b5dSDavid Sterba if (key.objectid != block_group->start) 1127a5ed9182SOmar Sandoval break; 1128a5ed9182SOmar Sandoval } 1129a5ed9182SOmar Sandoval 1130a5ed9182SOmar Sandoval ret = btrfs_next_item(extent_root, path); 1131a5ed9182SOmar Sandoval if (ret < 0) 1132511711afSChris Mason goto out_locked; 1133a5ed9182SOmar Sandoval if (ret) 1134a5ed9182SOmar Sandoval break; 1135a5ed9182SOmar Sandoval } 1136a5ed9182SOmar Sandoval if (start < end) { 11372d5cffa1SNikolay Borisov ret = __add_to_free_space_tree(trans, block_group, path2, 11382d5cffa1SNikolay Borisov start, end - start); 1139a5ed9182SOmar Sandoval if (ret) 1140511711afSChris Mason goto out_locked; 1141a5ed9182SOmar Sandoval } 1142a5ed9182SOmar Sandoval 1143a5ed9182SOmar Sandoval ret = 0; 1144511711afSChris Mason out_locked: 1145511711afSChris Mason mutex_unlock(&block_group->free_space_lock); 1146a5ed9182SOmar Sandoval out: 1147a5ed9182SOmar Sandoval btrfs_free_path(path2); 1148a5ed9182SOmar Sandoval btrfs_free_path(path); 1149a5ed9182SOmar Sandoval return ret; 1150a5ed9182SOmar Sandoval } 1151a5ed9182SOmar Sandoval 1152a5ed9182SOmar Sandoval int btrfs_create_free_space_tree(struct btrfs_fs_info *fs_info) 1153a5ed9182SOmar Sandoval { 1154a5ed9182SOmar Sandoval struct btrfs_trans_handle *trans; 1155a5ed9182SOmar Sandoval struct btrfs_root *tree_root = fs_info->tree_root; 1156a5ed9182SOmar Sandoval struct btrfs_root *free_space_root; 115732da5386SDavid Sterba struct btrfs_block_group *block_group; 1158a5ed9182SOmar Sandoval struct rb_node *node; 1159a5ed9182SOmar Sandoval int ret; 1160a5ed9182SOmar Sandoval 1161a5ed9182SOmar Sandoval trans = btrfs_start_transaction(tree_root, 0); 1162a5ed9182SOmar Sandoval if (IS_ERR(trans)) 1163a5ed9182SOmar Sandoval return PTR_ERR(trans); 1164a5ed9182SOmar Sandoval 1165afcdd129SJosef Bacik set_bit(BTRFS_FS_CREATING_FREE_SPACE_TREE, &fs_info->flags); 11662f96e402SJosef Bacik set_bit(BTRFS_FS_FREE_SPACE_TREE_UNTRUSTED, &fs_info->flags); 11679b7a2440SDavid Sterba free_space_root = btrfs_create_tree(trans, 1168a5ed9182SOmar Sandoval BTRFS_FREE_SPACE_TREE_OBJECTID); 1169a5ed9182SOmar Sandoval if (IS_ERR(free_space_root)) { 1170a5ed9182SOmar Sandoval ret = PTR_ERR(free_space_root); 1171a5ed9182SOmar Sandoval goto abort; 1172a5ed9182SOmar Sandoval } 1173*abed4aaaSJosef Bacik ret = btrfs_global_root_insert(free_space_root); 1174*abed4aaaSJosef Bacik if (ret) { 1175*abed4aaaSJosef Bacik btrfs_put_root(free_space_root); 1176*abed4aaaSJosef Bacik goto abort; 1177*abed4aaaSJosef Bacik } 1178a5ed9182SOmar Sandoval 1179a5ed9182SOmar Sandoval node = rb_first(&fs_info->block_group_cache_tree); 1180a5ed9182SOmar Sandoval while (node) { 118132da5386SDavid Sterba block_group = rb_entry(node, struct btrfs_block_group, 1182a5ed9182SOmar Sandoval cache_node); 1183ffa9a9efSNikolay Borisov ret = populate_free_space_tree(trans, block_group); 1184a5ed9182SOmar Sandoval if (ret) 1185a5ed9182SOmar Sandoval goto abort; 1186a5ed9182SOmar Sandoval node = rb_next(node); 1187a5ed9182SOmar Sandoval } 1188a5ed9182SOmar Sandoval 1189a5ed9182SOmar Sandoval btrfs_set_fs_compat_ro(fs_info, FREE_SPACE_TREE); 11906675df31SOmar Sandoval btrfs_set_fs_compat_ro(fs_info, FREE_SPACE_TREE_VALID); 1191afcdd129SJosef Bacik clear_bit(BTRFS_FS_CREATING_FREE_SPACE_TREE, &fs_info->flags); 11922f96e402SJosef Bacik ret = btrfs_commit_transaction(trans); 1193a5ed9182SOmar Sandoval 11942f96e402SJosef Bacik /* 11952f96e402SJosef Bacik * Now that we've committed the transaction any reading of our commit 11962f96e402SJosef Bacik * root will be safe, so we can cache from the free space tree now. 11972f96e402SJosef Bacik */ 11982f96e402SJosef Bacik clear_bit(BTRFS_FS_FREE_SPACE_TREE_UNTRUSTED, &fs_info->flags); 11992f96e402SJosef Bacik return ret; 1200a5ed9182SOmar Sandoval 1201a5ed9182SOmar Sandoval abort: 1202afcdd129SJosef Bacik clear_bit(BTRFS_FS_CREATING_FREE_SPACE_TREE, &fs_info->flags); 12032f96e402SJosef Bacik clear_bit(BTRFS_FS_FREE_SPACE_TREE_UNTRUSTED, &fs_info->flags); 120466642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 12053a45bb20SJeff Mahoney btrfs_end_transaction(trans); 1206a5ed9182SOmar Sandoval return ret; 1207a5ed9182SOmar Sandoval } 1208a5ed9182SOmar Sandoval 1209a5ed9182SOmar Sandoval static int clear_free_space_tree(struct btrfs_trans_handle *trans, 1210a5ed9182SOmar Sandoval struct btrfs_root *root) 1211a5ed9182SOmar Sandoval { 1212a5ed9182SOmar Sandoval struct btrfs_path *path; 1213a5ed9182SOmar Sandoval struct btrfs_key key; 1214a5ed9182SOmar Sandoval int nr; 1215a5ed9182SOmar Sandoval int ret; 1216a5ed9182SOmar Sandoval 1217a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1218a5ed9182SOmar Sandoval if (!path) 1219a5ed9182SOmar Sandoval return -ENOMEM; 1220a5ed9182SOmar Sandoval 1221a5ed9182SOmar Sandoval key.objectid = 0; 1222a5ed9182SOmar Sandoval key.type = 0; 1223a5ed9182SOmar Sandoval key.offset = 0; 1224a5ed9182SOmar Sandoval 1225a5ed9182SOmar Sandoval while (1) { 1226a5ed9182SOmar Sandoval ret = btrfs_search_slot(trans, root, &key, path, -1, 1); 1227a5ed9182SOmar Sandoval if (ret < 0) 1228a5ed9182SOmar Sandoval goto out; 1229a5ed9182SOmar Sandoval 1230a5ed9182SOmar Sandoval nr = btrfs_header_nritems(path->nodes[0]); 1231a5ed9182SOmar Sandoval if (!nr) 1232a5ed9182SOmar Sandoval break; 1233a5ed9182SOmar Sandoval 1234a5ed9182SOmar Sandoval path->slots[0] = 0; 1235a5ed9182SOmar Sandoval ret = btrfs_del_items(trans, root, path, 0, nr); 1236a5ed9182SOmar Sandoval if (ret) 1237a5ed9182SOmar Sandoval goto out; 1238a5ed9182SOmar Sandoval 1239a5ed9182SOmar Sandoval btrfs_release_path(path); 1240a5ed9182SOmar Sandoval } 1241a5ed9182SOmar Sandoval 1242a5ed9182SOmar Sandoval ret = 0; 1243a5ed9182SOmar Sandoval out: 1244a5ed9182SOmar Sandoval btrfs_free_path(path); 1245a5ed9182SOmar Sandoval return ret; 1246a5ed9182SOmar Sandoval } 1247a5ed9182SOmar Sandoval 1248a5ed9182SOmar Sandoval int btrfs_clear_free_space_tree(struct btrfs_fs_info *fs_info) 1249a5ed9182SOmar Sandoval { 1250a5ed9182SOmar Sandoval struct btrfs_trans_handle *trans; 1251a5ed9182SOmar Sandoval struct btrfs_root *tree_root = fs_info->tree_root; 1252*abed4aaaSJosef Bacik struct btrfs_key key = { 1253*abed4aaaSJosef Bacik .objectid = BTRFS_FREE_SPACE_TREE_OBJECTID, 1254*abed4aaaSJosef Bacik .type = BTRFS_ROOT_ITEM_KEY, 1255*abed4aaaSJosef Bacik .offset = 0, 1256*abed4aaaSJosef Bacik }; 1257*abed4aaaSJosef Bacik struct btrfs_root *free_space_root = btrfs_global_root(fs_info, &key); 1258a5ed9182SOmar Sandoval int ret; 1259a5ed9182SOmar Sandoval 1260a5ed9182SOmar Sandoval trans = btrfs_start_transaction(tree_root, 0); 1261a5ed9182SOmar Sandoval if (IS_ERR(trans)) 1262a5ed9182SOmar Sandoval return PTR_ERR(trans); 1263a5ed9182SOmar Sandoval 1264a5ed9182SOmar Sandoval btrfs_clear_fs_compat_ro(fs_info, FREE_SPACE_TREE); 12656675df31SOmar Sandoval btrfs_clear_fs_compat_ro(fs_info, FREE_SPACE_TREE_VALID); 1266a5ed9182SOmar Sandoval 1267a5ed9182SOmar Sandoval ret = clear_free_space_tree(trans, free_space_root); 1268a5ed9182SOmar Sandoval if (ret) 1269a5ed9182SOmar Sandoval goto abort; 1270a5ed9182SOmar Sandoval 1271ab9ce7d4SLu Fengqi ret = btrfs_del_root(trans, &free_space_root->root_key); 1272a5ed9182SOmar Sandoval if (ret) 1273a5ed9182SOmar Sandoval goto abort; 1274a5ed9182SOmar Sandoval 1275*abed4aaaSJosef Bacik btrfs_global_root_delete(free_space_root); 1276a5ed9182SOmar Sandoval list_del(&free_space_root->dirty_list); 1277a5ed9182SOmar Sandoval 1278a5ed9182SOmar Sandoval btrfs_tree_lock(free_space_root->node); 12796a884d7dSDavid Sterba btrfs_clean_tree_block(free_space_root->node); 1280a5ed9182SOmar Sandoval btrfs_tree_unlock(free_space_root->node); 12817a163608SFilipe Manana btrfs_free_tree_block(trans, btrfs_root_id(free_space_root), 12827a163608SFilipe Manana free_space_root->node, 0, 1); 1283a5ed9182SOmar Sandoval 128400246528SJosef Bacik btrfs_put_root(free_space_root); 1285a5ed9182SOmar Sandoval 12860bef7109SSahil Kang return btrfs_commit_transaction(trans); 1287a5ed9182SOmar Sandoval 1288a5ed9182SOmar Sandoval abort: 128966642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 12903a45bb20SJeff Mahoney btrfs_end_transaction(trans); 1291a5ed9182SOmar Sandoval return ret; 1292a5ed9182SOmar Sandoval } 1293a5ed9182SOmar Sandoval 1294a5ed9182SOmar Sandoval static int __add_block_group_free_space(struct btrfs_trans_handle *trans, 129532da5386SDavid Sterba struct btrfs_block_group *block_group, 1296a5ed9182SOmar Sandoval struct btrfs_path *path) 1297a5ed9182SOmar Sandoval { 1298a5ed9182SOmar Sandoval int ret; 1299a5ed9182SOmar Sandoval 1300a5ed9182SOmar Sandoval block_group->needs_free_space = 0; 1301a5ed9182SOmar Sandoval 130266afee18SNikolay Borisov ret = add_new_free_space_info(trans, block_group, path); 1303a5ed9182SOmar Sandoval if (ret) 1304a5ed9182SOmar Sandoval return ret; 1305a5ed9182SOmar Sandoval 13062d5cffa1SNikolay Borisov return __add_to_free_space_tree(trans, block_group, path, 1307b3470b5dSDavid Sterba block_group->start, 1308b3470b5dSDavid Sterba block_group->length); 1309a5ed9182SOmar Sandoval } 1310a5ed9182SOmar Sandoval 1311a5ed9182SOmar Sandoval int add_block_group_free_space(struct btrfs_trans_handle *trans, 131232da5386SDavid Sterba struct btrfs_block_group *block_group) 1313a5ed9182SOmar Sandoval { 1314e4e0711cSNikolay Borisov struct btrfs_fs_info *fs_info = trans->fs_info; 1315a5ed9182SOmar Sandoval struct btrfs_path *path = NULL; 1316a5ed9182SOmar Sandoval int ret = 0; 1317a5ed9182SOmar Sandoval 1318a5ed9182SOmar Sandoval if (!btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) 1319a5ed9182SOmar Sandoval return 0; 1320a5ed9182SOmar Sandoval 1321a5ed9182SOmar Sandoval mutex_lock(&block_group->free_space_lock); 1322a5ed9182SOmar Sandoval if (!block_group->needs_free_space) 1323a5ed9182SOmar Sandoval goto out; 1324a5ed9182SOmar Sandoval 1325a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1326a5ed9182SOmar Sandoval if (!path) { 1327a5ed9182SOmar Sandoval ret = -ENOMEM; 1328a5ed9182SOmar Sandoval goto out; 1329a5ed9182SOmar Sandoval } 1330a5ed9182SOmar Sandoval 13319a7e0f92SNikolay Borisov ret = __add_block_group_free_space(trans, block_group, path); 1332a5ed9182SOmar Sandoval 1333a5ed9182SOmar Sandoval out: 1334a5ed9182SOmar Sandoval btrfs_free_path(path); 1335a5ed9182SOmar Sandoval mutex_unlock(&block_group->free_space_lock); 1336a5ed9182SOmar Sandoval if (ret) 133766642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 1338a5ed9182SOmar Sandoval return ret; 1339a5ed9182SOmar Sandoval } 1340a5ed9182SOmar Sandoval 1341a5ed9182SOmar Sandoval int remove_block_group_free_space(struct btrfs_trans_handle *trans, 134232da5386SDavid Sterba struct btrfs_block_group *block_group) 1343a5ed9182SOmar Sandoval { 13447939dd9fSJosef Bacik struct btrfs_root *root = btrfs_free_space_root(block_group); 1345a5ed9182SOmar Sandoval struct btrfs_path *path; 1346a5ed9182SOmar Sandoval struct btrfs_key key, found_key; 1347a5ed9182SOmar Sandoval struct extent_buffer *leaf; 1348a5ed9182SOmar Sandoval u64 start, end; 1349a5ed9182SOmar Sandoval int done = 0, nr; 1350a5ed9182SOmar Sandoval int ret; 1351a5ed9182SOmar Sandoval 1352f3f72779SNikolay Borisov if (!btrfs_fs_compat_ro(trans->fs_info, FREE_SPACE_TREE)) 1353a5ed9182SOmar Sandoval return 0; 1354a5ed9182SOmar Sandoval 1355a5ed9182SOmar Sandoval if (block_group->needs_free_space) { 1356a5ed9182SOmar Sandoval /* We never added this block group to the free space tree. */ 1357a5ed9182SOmar Sandoval return 0; 1358a5ed9182SOmar Sandoval } 1359a5ed9182SOmar Sandoval 1360a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1361a5ed9182SOmar Sandoval if (!path) { 1362a5ed9182SOmar Sandoval ret = -ENOMEM; 1363a5ed9182SOmar Sandoval goto out; 1364a5ed9182SOmar Sandoval } 1365a5ed9182SOmar Sandoval 1366b3470b5dSDavid Sterba start = block_group->start; 1367b3470b5dSDavid Sterba end = block_group->start + block_group->length; 1368a5ed9182SOmar Sandoval 1369a5ed9182SOmar Sandoval key.objectid = end - 1; 1370a5ed9182SOmar Sandoval key.type = (u8)-1; 1371a5ed9182SOmar Sandoval key.offset = (u64)-1; 1372a5ed9182SOmar Sandoval 1373a5ed9182SOmar Sandoval while (!done) { 1374a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 1375a5ed9182SOmar Sandoval if (ret) 1376a5ed9182SOmar Sandoval goto out; 1377a5ed9182SOmar Sandoval 1378a5ed9182SOmar Sandoval leaf = path->nodes[0]; 1379a5ed9182SOmar Sandoval nr = 0; 1380a5ed9182SOmar Sandoval path->slots[0]++; 1381a5ed9182SOmar Sandoval while (path->slots[0] > 0) { 1382a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0] - 1); 1383a5ed9182SOmar Sandoval 1384a5ed9182SOmar Sandoval if (found_key.type == BTRFS_FREE_SPACE_INFO_KEY) { 1385b3470b5dSDavid Sterba ASSERT(found_key.objectid == block_group->start); 1386b3470b5dSDavid Sterba ASSERT(found_key.offset == block_group->length); 1387a5ed9182SOmar Sandoval done = 1; 1388a5ed9182SOmar Sandoval nr++; 1389a5ed9182SOmar Sandoval path->slots[0]--; 1390a5ed9182SOmar Sandoval break; 1391a5ed9182SOmar Sandoval } else if (found_key.type == BTRFS_FREE_SPACE_EXTENT_KEY || 1392a5ed9182SOmar Sandoval found_key.type == BTRFS_FREE_SPACE_BITMAP_KEY) { 1393a5ed9182SOmar Sandoval ASSERT(found_key.objectid >= start); 1394a5ed9182SOmar Sandoval ASSERT(found_key.objectid < end); 1395a5ed9182SOmar Sandoval ASSERT(found_key.objectid + found_key.offset <= end); 1396a5ed9182SOmar Sandoval nr++; 1397a5ed9182SOmar Sandoval path->slots[0]--; 1398a5ed9182SOmar Sandoval } else { 1399a5ed9182SOmar Sandoval ASSERT(0); 1400a5ed9182SOmar Sandoval } 1401a5ed9182SOmar Sandoval } 1402a5ed9182SOmar Sandoval 1403a5ed9182SOmar Sandoval ret = btrfs_del_items(trans, root, path, path->slots[0], nr); 1404a5ed9182SOmar Sandoval if (ret) 1405a5ed9182SOmar Sandoval goto out; 1406a5ed9182SOmar Sandoval btrfs_release_path(path); 1407a5ed9182SOmar Sandoval } 1408a5ed9182SOmar Sandoval 1409a5ed9182SOmar Sandoval ret = 0; 1410a5ed9182SOmar Sandoval out: 1411a5ed9182SOmar Sandoval btrfs_free_path(path); 1412a5ed9182SOmar Sandoval if (ret) 141366642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 1414a5ed9182SOmar Sandoval return ret; 1415a5ed9182SOmar Sandoval } 1416a5ed9182SOmar Sandoval 1417a5ed9182SOmar Sandoval static int load_free_space_bitmaps(struct btrfs_caching_control *caching_ctl, 1418a5ed9182SOmar Sandoval struct btrfs_path *path, 1419a5ed9182SOmar Sandoval u32 expected_extent_count) 1420a5ed9182SOmar Sandoval { 142132da5386SDavid Sterba struct btrfs_block_group *block_group; 1422a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info; 1423a5ed9182SOmar Sandoval struct btrfs_root *root; 1424a5ed9182SOmar Sandoval struct btrfs_key key; 1425a5ed9182SOmar Sandoval int prev_bit = 0, bit; 1426a5ed9182SOmar Sandoval /* Initialize to silence GCC. */ 1427a5ed9182SOmar Sandoval u64 extent_start = 0; 1428a5ed9182SOmar Sandoval u64 end, offset; 1429a5ed9182SOmar Sandoval u64 total_found = 0; 1430a5ed9182SOmar Sandoval u32 extent_count = 0; 1431a5ed9182SOmar Sandoval int ret; 1432a5ed9182SOmar Sandoval 1433a5ed9182SOmar Sandoval block_group = caching_ctl->block_group; 1434a5ed9182SOmar Sandoval fs_info = block_group->fs_info; 14357939dd9fSJosef Bacik root = btrfs_free_space_root(block_group); 1436a5ed9182SOmar Sandoval 1437b3470b5dSDavid Sterba end = block_group->start + block_group->length; 1438a5ed9182SOmar Sandoval 1439a5ed9182SOmar Sandoval while (1) { 1440a5ed9182SOmar Sandoval ret = btrfs_next_item(root, path); 1441a5ed9182SOmar Sandoval if (ret < 0) 1442a5ed9182SOmar Sandoval goto out; 1443a5ed9182SOmar Sandoval if (ret) 1444a5ed9182SOmar Sandoval break; 1445a5ed9182SOmar Sandoval 1446a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 1447a5ed9182SOmar Sandoval 1448a5ed9182SOmar Sandoval if (key.type == BTRFS_FREE_SPACE_INFO_KEY) 1449a5ed9182SOmar Sandoval break; 1450a5ed9182SOmar Sandoval 1451a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_BITMAP_KEY); 1452a5ed9182SOmar Sandoval ASSERT(key.objectid < end && key.objectid + key.offset <= end); 1453a5ed9182SOmar Sandoval 1454a5ed9182SOmar Sandoval caching_ctl->progress = key.objectid; 1455a5ed9182SOmar Sandoval 1456a5ed9182SOmar Sandoval offset = key.objectid; 1457a5ed9182SOmar Sandoval while (offset < key.objectid + key.offset) { 1458a5ed9182SOmar Sandoval bit = free_space_test_bit(block_group, path, offset); 1459a5ed9182SOmar Sandoval if (prev_bit == 0 && bit == 1) { 1460a5ed9182SOmar Sandoval extent_start = offset; 1461a5ed9182SOmar Sandoval } else if (prev_bit == 1 && bit == 0) { 1462a5ed9182SOmar Sandoval total_found += add_new_free_space(block_group, 1463a5ed9182SOmar Sandoval extent_start, 1464a5ed9182SOmar Sandoval offset); 1465a5ed9182SOmar Sandoval if (total_found > CACHING_CTL_WAKE_UP) { 1466a5ed9182SOmar Sandoval total_found = 0; 1467a5ed9182SOmar Sandoval wake_up(&caching_ctl->wait); 1468a5ed9182SOmar Sandoval } 1469a5ed9182SOmar Sandoval extent_count++; 1470a5ed9182SOmar Sandoval } 1471a5ed9182SOmar Sandoval prev_bit = bit; 14720b246afaSJeff Mahoney offset += fs_info->sectorsize; 1473a5ed9182SOmar Sandoval } 1474a5ed9182SOmar Sandoval } 1475a5ed9182SOmar Sandoval if (prev_bit == 1) { 14764457c1c7SNikolay Borisov total_found += add_new_free_space(block_group, extent_start, 14774457c1c7SNikolay Borisov end); 1478a5ed9182SOmar Sandoval extent_count++; 1479a5ed9182SOmar Sandoval } 1480a5ed9182SOmar Sandoval 1481a5ed9182SOmar Sandoval if (extent_count != expected_extent_count) { 14825d163e0eSJeff Mahoney btrfs_err(fs_info, 14835d163e0eSJeff Mahoney "incorrect extent count for %llu; counted %u, expected %u", 1484b3470b5dSDavid Sterba block_group->start, extent_count, 1485a5ed9182SOmar Sandoval expected_extent_count); 1486a5ed9182SOmar Sandoval ASSERT(0); 1487a5ed9182SOmar Sandoval ret = -EIO; 1488a5ed9182SOmar Sandoval goto out; 1489a5ed9182SOmar Sandoval } 1490a5ed9182SOmar Sandoval 1491a5ed9182SOmar Sandoval caching_ctl->progress = (u64)-1; 1492a5ed9182SOmar Sandoval 1493a5ed9182SOmar Sandoval ret = 0; 1494a5ed9182SOmar Sandoval out: 1495a5ed9182SOmar Sandoval return ret; 1496a5ed9182SOmar Sandoval } 1497a5ed9182SOmar Sandoval 1498a5ed9182SOmar Sandoval static int load_free_space_extents(struct btrfs_caching_control *caching_ctl, 1499a5ed9182SOmar Sandoval struct btrfs_path *path, 1500a5ed9182SOmar Sandoval u32 expected_extent_count) 1501a5ed9182SOmar Sandoval { 150232da5386SDavid Sterba struct btrfs_block_group *block_group; 1503a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info; 1504a5ed9182SOmar Sandoval struct btrfs_root *root; 1505a5ed9182SOmar Sandoval struct btrfs_key key; 1506a5ed9182SOmar Sandoval u64 end; 1507a5ed9182SOmar Sandoval u64 total_found = 0; 1508a5ed9182SOmar Sandoval u32 extent_count = 0; 1509a5ed9182SOmar Sandoval int ret; 1510a5ed9182SOmar Sandoval 1511a5ed9182SOmar Sandoval block_group = caching_ctl->block_group; 1512a5ed9182SOmar Sandoval fs_info = block_group->fs_info; 15137939dd9fSJosef Bacik root = btrfs_free_space_root(block_group); 1514a5ed9182SOmar Sandoval 1515b3470b5dSDavid Sterba end = block_group->start + block_group->length; 1516a5ed9182SOmar Sandoval 1517a5ed9182SOmar Sandoval while (1) { 1518a5ed9182SOmar Sandoval ret = btrfs_next_item(root, path); 1519a5ed9182SOmar Sandoval if (ret < 0) 1520a5ed9182SOmar Sandoval goto out; 1521a5ed9182SOmar Sandoval if (ret) 1522a5ed9182SOmar Sandoval break; 1523a5ed9182SOmar Sandoval 1524a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 1525a5ed9182SOmar Sandoval 1526a5ed9182SOmar Sandoval if (key.type == BTRFS_FREE_SPACE_INFO_KEY) 1527a5ed9182SOmar Sandoval break; 1528a5ed9182SOmar Sandoval 1529a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_EXTENT_KEY); 1530a5ed9182SOmar Sandoval ASSERT(key.objectid < end && key.objectid + key.offset <= end); 1531a5ed9182SOmar Sandoval 1532a5ed9182SOmar Sandoval caching_ctl->progress = key.objectid; 1533a5ed9182SOmar Sandoval 15344457c1c7SNikolay Borisov total_found += add_new_free_space(block_group, key.objectid, 1535a5ed9182SOmar Sandoval key.objectid + key.offset); 1536a5ed9182SOmar Sandoval if (total_found > CACHING_CTL_WAKE_UP) { 1537a5ed9182SOmar Sandoval total_found = 0; 1538a5ed9182SOmar Sandoval wake_up(&caching_ctl->wait); 1539a5ed9182SOmar Sandoval } 1540a5ed9182SOmar Sandoval extent_count++; 1541a5ed9182SOmar Sandoval } 1542a5ed9182SOmar Sandoval 1543a5ed9182SOmar Sandoval if (extent_count != expected_extent_count) { 15445d163e0eSJeff Mahoney btrfs_err(fs_info, 15455d163e0eSJeff Mahoney "incorrect extent count for %llu; counted %u, expected %u", 1546b3470b5dSDavid Sterba block_group->start, extent_count, 1547a5ed9182SOmar Sandoval expected_extent_count); 1548a5ed9182SOmar Sandoval ASSERT(0); 1549a5ed9182SOmar Sandoval ret = -EIO; 1550a5ed9182SOmar Sandoval goto out; 1551a5ed9182SOmar Sandoval } 1552a5ed9182SOmar Sandoval 1553a5ed9182SOmar Sandoval caching_ctl->progress = (u64)-1; 1554a5ed9182SOmar Sandoval 1555a5ed9182SOmar Sandoval ret = 0; 1556a5ed9182SOmar Sandoval out: 1557a5ed9182SOmar Sandoval return ret; 1558a5ed9182SOmar Sandoval } 1559a5ed9182SOmar Sandoval 1560a5ed9182SOmar Sandoval int load_free_space_tree(struct btrfs_caching_control *caching_ctl) 1561a5ed9182SOmar Sandoval { 156232da5386SDavid Sterba struct btrfs_block_group *block_group; 1563a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 1564a5ed9182SOmar Sandoval struct btrfs_path *path; 1565a5ed9182SOmar Sandoval u32 extent_count, flags; 1566a5ed9182SOmar Sandoval int ret; 1567a5ed9182SOmar Sandoval 1568a5ed9182SOmar Sandoval block_group = caching_ctl->block_group; 1569a5ed9182SOmar Sandoval 1570a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1571a5ed9182SOmar Sandoval if (!path) 1572a5ed9182SOmar Sandoval return -ENOMEM; 1573a5ed9182SOmar Sandoval 1574a5ed9182SOmar Sandoval /* 1575a5ed9182SOmar Sandoval * Just like caching_thread() doesn't want to deadlock on the extent 1576a5ed9182SOmar Sandoval * tree, we don't want to deadlock on the free space tree. 1577a5ed9182SOmar Sandoval */ 1578a5ed9182SOmar Sandoval path->skip_locking = 1; 1579a5ed9182SOmar Sandoval path->search_commit_root = 1; 15807ce311d5SGu JinXiang path->reada = READA_FORWARD; 1581a5ed9182SOmar Sandoval 15822ccf545eSDavid Sterba info = search_free_space_info(NULL, block_group, path, 0); 1583a5ed9182SOmar Sandoval if (IS_ERR(info)) { 1584a5ed9182SOmar Sandoval ret = PTR_ERR(info); 1585a5ed9182SOmar Sandoval goto out; 1586a5ed9182SOmar Sandoval } 1587a5ed9182SOmar Sandoval extent_count = btrfs_free_space_extent_count(path->nodes[0], info); 1588a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(path->nodes[0], info); 1589a5ed9182SOmar Sandoval 1590a5ed9182SOmar Sandoval /* 1591a5ed9182SOmar Sandoval * We left path pointing to the free space info item, so now 1592a5ed9182SOmar Sandoval * load_free_space_foo can just iterate through the free space tree from 1593a5ed9182SOmar Sandoval * there. 1594a5ed9182SOmar Sandoval */ 1595a5ed9182SOmar Sandoval if (flags & BTRFS_FREE_SPACE_USING_BITMAPS) 1596a5ed9182SOmar Sandoval ret = load_free_space_bitmaps(caching_ctl, path, extent_count); 1597a5ed9182SOmar Sandoval else 1598a5ed9182SOmar Sandoval ret = load_free_space_extents(caching_ctl, path, extent_count); 1599a5ed9182SOmar Sandoval 1600a5ed9182SOmar Sandoval out: 1601a5ed9182SOmar Sandoval btrfs_free_path(path); 1602a5ed9182SOmar Sandoval return ret; 1603a5ed9182SOmar Sandoval } 1604