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> 8*9b569ea0SJosef Bacik #include "messages.h" 9a5ed9182SOmar Sandoval #include "ctree.h" 10a5ed9182SOmar Sandoval #include "disk-io.h" 11a5ed9182SOmar Sandoval #include "locking.h" 12a5ed9182SOmar Sandoval #include "free-space-tree.h" 13a5ed9182SOmar Sandoval #include "transaction.h" 14aac0023cSJosef Bacik #include "block-group.h" 15c7f13d42SJosef Bacik #include "fs.h" 16a5ed9182SOmar Sandoval 17a5ed9182SOmar Sandoval static int __add_block_group_free_space(struct btrfs_trans_handle *trans, 1832da5386SDavid Sterba struct btrfs_block_group *block_group, 19a5ed9182SOmar Sandoval struct btrfs_path *path); 20a5ed9182SOmar Sandoval 217939dd9fSJosef Bacik static struct btrfs_root *btrfs_free_space_root( 227939dd9fSJosef Bacik struct btrfs_block_group *block_group) 237939dd9fSJosef Bacik { 24abed4aaaSJosef Bacik struct btrfs_key key = { 25abed4aaaSJosef Bacik .objectid = BTRFS_FREE_SPACE_TREE_OBJECTID, 26abed4aaaSJosef Bacik .type = BTRFS_ROOT_ITEM_KEY, 27abed4aaaSJosef Bacik .offset = 0, 28abed4aaaSJosef Bacik }; 29abed4aaaSJosef Bacik 30f7238e50SJosef Bacik if (btrfs_fs_incompat(block_group->fs_info, EXTENT_TREE_V2)) 31f7238e50SJosef Bacik key.offset = block_group->global_root_id; 32abed4aaaSJosef Bacik return btrfs_global_root(block_group->fs_info, &key); 337939dd9fSJosef Bacik } 347939dd9fSJosef Bacik 3532da5386SDavid Sterba void set_free_space_tree_thresholds(struct btrfs_block_group *cache) 36a5ed9182SOmar Sandoval { 37a5ed9182SOmar Sandoval u32 bitmap_range; 38a5ed9182SOmar Sandoval size_t bitmap_size; 39a5ed9182SOmar Sandoval u64 num_bitmaps, total_bitmap_size; 40a5ed9182SOmar Sandoval 41e3e39c72SMarcos Paulo de Souza if (WARN_ON(cache->length == 0)) 42e3e39c72SMarcos Paulo de Souza btrfs_warn(cache->fs_info, "block group %llu length is zero", 43e3e39c72SMarcos Paulo de Souza cache->start); 44e3e39c72SMarcos Paulo de Souza 45a5ed9182SOmar Sandoval /* 46a5ed9182SOmar Sandoval * We convert to bitmaps when the disk space required for using extents 47a5ed9182SOmar Sandoval * exceeds that required for using bitmaps. 48a5ed9182SOmar Sandoval */ 49da17066cSJeff Mahoney bitmap_range = cache->fs_info->sectorsize * BTRFS_FREE_SPACE_BITMAP_BITS; 50b3470b5dSDavid Sterba num_bitmaps = div_u64(cache->length + bitmap_range - 1, bitmap_range); 51a5ed9182SOmar Sandoval bitmap_size = sizeof(struct btrfs_item) + BTRFS_FREE_SPACE_BITMAP_SIZE; 52a5ed9182SOmar Sandoval total_bitmap_size = num_bitmaps * bitmap_size; 53a5ed9182SOmar Sandoval cache->bitmap_high_thresh = div_u64(total_bitmap_size, 54a5ed9182SOmar Sandoval sizeof(struct btrfs_item)); 55a5ed9182SOmar Sandoval 56a5ed9182SOmar Sandoval /* 57a5ed9182SOmar Sandoval * We allow for a small buffer between the high threshold and low 58a5ed9182SOmar Sandoval * threshold to avoid thrashing back and forth between the two formats. 59a5ed9182SOmar Sandoval */ 60a5ed9182SOmar Sandoval if (cache->bitmap_high_thresh > 100) 61a5ed9182SOmar Sandoval cache->bitmap_low_thresh = cache->bitmap_high_thresh - 100; 62a5ed9182SOmar Sandoval else 63a5ed9182SOmar Sandoval cache->bitmap_low_thresh = 0; 64a5ed9182SOmar Sandoval } 65a5ed9182SOmar Sandoval 66a5ed9182SOmar Sandoval static int add_new_free_space_info(struct btrfs_trans_handle *trans, 6732da5386SDavid Sterba struct btrfs_block_group *block_group, 68a5ed9182SOmar Sandoval struct btrfs_path *path) 69a5ed9182SOmar Sandoval { 707939dd9fSJosef Bacik struct btrfs_root *root = btrfs_free_space_root(block_group); 71a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 72a5ed9182SOmar Sandoval struct btrfs_key key; 73a5ed9182SOmar Sandoval struct extent_buffer *leaf; 74a5ed9182SOmar Sandoval int ret; 75a5ed9182SOmar Sandoval 76b3470b5dSDavid Sterba key.objectid = block_group->start; 77a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_INFO_KEY; 78b3470b5dSDavid Sterba key.offset = block_group->length; 79a5ed9182SOmar Sandoval 80a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(*info)); 81a5ed9182SOmar Sandoval if (ret) 82a5ed9182SOmar Sandoval goto out; 83a5ed9182SOmar Sandoval 84a5ed9182SOmar Sandoval leaf = path->nodes[0]; 85a5ed9182SOmar Sandoval info = btrfs_item_ptr(leaf, path->slots[0], 86a5ed9182SOmar Sandoval struct btrfs_free_space_info); 87a5ed9182SOmar Sandoval btrfs_set_free_space_extent_count(leaf, info, 0); 88a5ed9182SOmar Sandoval btrfs_set_free_space_flags(leaf, info, 0); 89a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 90a5ed9182SOmar Sandoval 91a5ed9182SOmar Sandoval ret = 0; 92a5ed9182SOmar Sandoval out: 93a5ed9182SOmar Sandoval btrfs_release_path(path); 94a5ed9182SOmar Sandoval return ret; 95a5ed9182SOmar Sandoval } 96a5ed9182SOmar Sandoval 97ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 98ce9f967fSJohannes Thumshirn struct btrfs_free_space_info *search_free_space_info( 992ccf545eSDavid Sterba struct btrfs_trans_handle *trans, 10032da5386SDavid Sterba struct btrfs_block_group *block_group, 101a5ed9182SOmar Sandoval struct btrfs_path *path, int cow) 102a5ed9182SOmar Sandoval { 1032ccf545eSDavid Sterba struct btrfs_fs_info *fs_info = block_group->fs_info; 1047939dd9fSJosef Bacik struct btrfs_root *root = btrfs_free_space_root(block_group); 105a5ed9182SOmar Sandoval struct btrfs_key key; 106a5ed9182SOmar Sandoval int ret; 107a5ed9182SOmar Sandoval 108b3470b5dSDavid Sterba key.objectid = block_group->start; 109a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_INFO_KEY; 110b3470b5dSDavid Sterba key.offset = block_group->length; 111a5ed9182SOmar Sandoval 112a5ed9182SOmar Sandoval ret = btrfs_search_slot(trans, root, &key, path, 0, cow); 113a5ed9182SOmar Sandoval if (ret < 0) 114a5ed9182SOmar Sandoval return ERR_PTR(ret); 115a5ed9182SOmar Sandoval if (ret != 0) { 116ab8d0fc4SJeff Mahoney btrfs_warn(fs_info, "missing free space info for %llu", 117b3470b5dSDavid Sterba block_group->start); 118a5ed9182SOmar Sandoval ASSERT(0); 119a5ed9182SOmar Sandoval return ERR_PTR(-ENOENT); 120a5ed9182SOmar Sandoval } 121a5ed9182SOmar Sandoval 122a5ed9182SOmar Sandoval return btrfs_item_ptr(path->nodes[0], path->slots[0], 123a5ed9182SOmar Sandoval struct btrfs_free_space_info); 124a5ed9182SOmar Sandoval } 125a5ed9182SOmar Sandoval 126a5ed9182SOmar Sandoval /* 127a5ed9182SOmar Sandoval * btrfs_search_slot() but we're looking for the greatest key less than the 128a5ed9182SOmar Sandoval * passed key. 129a5ed9182SOmar Sandoval */ 130a5ed9182SOmar Sandoval static int btrfs_search_prev_slot(struct btrfs_trans_handle *trans, 131a5ed9182SOmar Sandoval struct btrfs_root *root, 132a5ed9182SOmar Sandoval struct btrfs_key *key, struct btrfs_path *p, 133a5ed9182SOmar Sandoval int ins_len, int cow) 134a5ed9182SOmar Sandoval { 135a5ed9182SOmar Sandoval int ret; 136a5ed9182SOmar Sandoval 137a5ed9182SOmar Sandoval ret = btrfs_search_slot(trans, root, key, p, ins_len, cow); 138a5ed9182SOmar Sandoval if (ret < 0) 139a5ed9182SOmar Sandoval return ret; 140a5ed9182SOmar Sandoval 141a5ed9182SOmar Sandoval if (ret == 0) { 142a5ed9182SOmar Sandoval ASSERT(0); 143a5ed9182SOmar Sandoval return -EIO; 144a5ed9182SOmar Sandoval } 145a5ed9182SOmar Sandoval 146a5ed9182SOmar Sandoval if (p->slots[0] == 0) { 147a5ed9182SOmar Sandoval ASSERT(0); 148a5ed9182SOmar Sandoval return -EIO; 149a5ed9182SOmar Sandoval } 150a5ed9182SOmar Sandoval p->slots[0]--; 151a5ed9182SOmar Sandoval 152a5ed9182SOmar Sandoval return 0; 153a5ed9182SOmar Sandoval } 154a5ed9182SOmar Sandoval 155098e6308SDavid Sterba static inline u32 free_space_bitmap_size(const struct btrfs_fs_info *fs_info, 156098e6308SDavid Sterba u64 size) 157a5ed9182SOmar Sandoval { 158098e6308SDavid Sterba return DIV_ROUND_UP(size >> fs_info->sectorsize_bits, BITS_PER_BYTE); 159a5ed9182SOmar Sandoval } 160a5ed9182SOmar Sandoval 161a565971fSHoward McLauchlan static unsigned long *alloc_bitmap(u32 bitmap_size) 162a5ed9182SOmar Sandoval { 163a565971fSHoward McLauchlan unsigned long *ret; 16425ff17e8SOmar Sandoval unsigned int nofs_flag; 165a565971fSHoward McLauchlan u32 bitmap_rounded_size = round_up(bitmap_size, sizeof(unsigned long)); 16679b134a2SDavid Sterba 16779b134a2SDavid Sterba /* 16825ff17e8SOmar Sandoval * GFP_NOFS doesn't work with kvmalloc(), but we really can't recurse 16925ff17e8SOmar Sandoval * into the filesystem as the free space bitmap can be modified in the 17025ff17e8SOmar Sandoval * critical section of a transaction commit. 17125ff17e8SOmar Sandoval * 17225ff17e8SOmar Sandoval * TODO: push the memalloc_nofs_{save,restore}() to the caller where we 17325ff17e8SOmar Sandoval * know that recursion is unsafe. 17479b134a2SDavid Sterba */ 17525ff17e8SOmar Sandoval nofs_flag = memalloc_nofs_save(); 176a565971fSHoward McLauchlan ret = kvzalloc(bitmap_rounded_size, GFP_KERNEL); 17725ff17e8SOmar Sandoval memalloc_nofs_restore(nofs_flag); 17825ff17e8SOmar Sandoval return ret; 179a5ed9182SOmar Sandoval } 180a5ed9182SOmar Sandoval 181a565971fSHoward McLauchlan static void le_bitmap_set(unsigned long *map, unsigned int start, int len) 1826faa8f47SHoward McLauchlan { 183a565971fSHoward McLauchlan u8 *p = ((u8 *)map) + BIT_BYTE(start); 1846faa8f47SHoward McLauchlan const unsigned int size = start + len; 1856faa8f47SHoward McLauchlan int bits_to_set = BITS_PER_BYTE - (start % BITS_PER_BYTE); 1866faa8f47SHoward McLauchlan u8 mask_to_set = BITMAP_FIRST_BYTE_MASK(start); 1876faa8f47SHoward McLauchlan 1886faa8f47SHoward McLauchlan while (len - bits_to_set >= 0) { 1896faa8f47SHoward McLauchlan *p |= mask_to_set; 1906faa8f47SHoward McLauchlan len -= bits_to_set; 1916faa8f47SHoward McLauchlan bits_to_set = BITS_PER_BYTE; 1926faa8f47SHoward McLauchlan mask_to_set = ~0; 1936faa8f47SHoward McLauchlan p++; 1946faa8f47SHoward McLauchlan } 1956faa8f47SHoward McLauchlan if (len) { 1966faa8f47SHoward McLauchlan mask_to_set &= BITMAP_LAST_BYTE_MASK(size); 1976faa8f47SHoward McLauchlan *p |= mask_to_set; 1986faa8f47SHoward McLauchlan } 1996faa8f47SHoward McLauchlan } 2006faa8f47SHoward McLauchlan 201ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 202a5ed9182SOmar Sandoval int convert_free_space_to_bitmaps(struct btrfs_trans_handle *trans, 20332da5386SDavid Sterba struct btrfs_block_group *block_group, 204a5ed9182SOmar Sandoval struct btrfs_path *path) 205a5ed9182SOmar Sandoval { 206719fb4deSNikolay Borisov struct btrfs_fs_info *fs_info = trans->fs_info; 2077939dd9fSJosef Bacik struct btrfs_root *root = btrfs_free_space_root(block_group); 208a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 209a5ed9182SOmar Sandoval struct btrfs_key key, found_key; 210a5ed9182SOmar Sandoval struct extent_buffer *leaf; 211a565971fSHoward McLauchlan unsigned long *bitmap; 212a565971fSHoward McLauchlan char *bitmap_cursor; 213a5ed9182SOmar Sandoval u64 start, end; 214a5ed9182SOmar Sandoval u64 bitmap_range, i; 215a5ed9182SOmar Sandoval u32 bitmap_size, flags, expected_extent_count; 216a5ed9182SOmar Sandoval u32 extent_count = 0; 217a5ed9182SOmar Sandoval int done = 0, nr; 218a5ed9182SOmar Sandoval int ret; 219a5ed9182SOmar Sandoval 220098e6308SDavid Sterba bitmap_size = free_space_bitmap_size(fs_info, block_group->length); 221a5ed9182SOmar Sandoval bitmap = alloc_bitmap(bitmap_size); 222a5ed9182SOmar Sandoval if (!bitmap) { 223a5ed9182SOmar Sandoval ret = -ENOMEM; 224a5ed9182SOmar Sandoval goto out; 225a5ed9182SOmar Sandoval } 226a5ed9182SOmar Sandoval 227b3470b5dSDavid Sterba start = block_group->start; 228b3470b5dSDavid Sterba end = block_group->start + block_group->length; 229a5ed9182SOmar Sandoval 230a5ed9182SOmar Sandoval key.objectid = end - 1; 231a5ed9182SOmar Sandoval key.type = (u8)-1; 232a5ed9182SOmar Sandoval key.offset = (u64)-1; 233a5ed9182SOmar Sandoval 234a5ed9182SOmar Sandoval while (!done) { 235a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 236a5ed9182SOmar Sandoval if (ret) 237a5ed9182SOmar Sandoval goto out; 238a5ed9182SOmar Sandoval 239a5ed9182SOmar Sandoval leaf = path->nodes[0]; 240a5ed9182SOmar Sandoval nr = 0; 241a5ed9182SOmar Sandoval path->slots[0]++; 242a5ed9182SOmar Sandoval while (path->slots[0] > 0) { 243a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0] - 1); 244a5ed9182SOmar Sandoval 245a5ed9182SOmar Sandoval if (found_key.type == BTRFS_FREE_SPACE_INFO_KEY) { 246b3470b5dSDavid Sterba ASSERT(found_key.objectid == block_group->start); 247b3470b5dSDavid Sterba ASSERT(found_key.offset == block_group->length); 248a5ed9182SOmar Sandoval done = 1; 249a5ed9182SOmar Sandoval break; 250a5ed9182SOmar Sandoval } else if (found_key.type == BTRFS_FREE_SPACE_EXTENT_KEY) { 251a5ed9182SOmar Sandoval u64 first, last; 252a5ed9182SOmar Sandoval 253a5ed9182SOmar Sandoval ASSERT(found_key.objectid >= start); 254a5ed9182SOmar Sandoval ASSERT(found_key.objectid < end); 255a5ed9182SOmar Sandoval ASSERT(found_key.objectid + found_key.offset <= end); 256a5ed9182SOmar Sandoval 257a5ed9182SOmar Sandoval first = div_u64(found_key.objectid - start, 2580b246afaSJeff Mahoney fs_info->sectorsize); 259a5ed9182SOmar Sandoval last = div_u64(found_key.objectid + found_key.offset - start, 2600b246afaSJeff Mahoney fs_info->sectorsize); 2612fe1d551SOmar Sandoval le_bitmap_set(bitmap, first, last - first); 262a5ed9182SOmar Sandoval 263a5ed9182SOmar Sandoval extent_count++; 264a5ed9182SOmar Sandoval nr++; 265a5ed9182SOmar Sandoval path->slots[0]--; 266a5ed9182SOmar Sandoval } else { 267a5ed9182SOmar Sandoval ASSERT(0); 268a5ed9182SOmar Sandoval } 269a5ed9182SOmar Sandoval } 270a5ed9182SOmar Sandoval 271a5ed9182SOmar Sandoval ret = btrfs_del_items(trans, root, path, path->slots[0], nr); 272a5ed9182SOmar Sandoval if (ret) 273a5ed9182SOmar Sandoval goto out; 274a5ed9182SOmar Sandoval btrfs_release_path(path); 275a5ed9182SOmar Sandoval } 276a5ed9182SOmar Sandoval 2772ccf545eSDavid Sterba info = search_free_space_info(trans, block_group, path, 1); 278a5ed9182SOmar Sandoval if (IS_ERR(info)) { 279a5ed9182SOmar Sandoval ret = PTR_ERR(info); 280a5ed9182SOmar Sandoval goto out; 281a5ed9182SOmar Sandoval } 282a5ed9182SOmar Sandoval leaf = path->nodes[0]; 283a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(leaf, info); 284a5ed9182SOmar Sandoval flags |= BTRFS_FREE_SPACE_USING_BITMAPS; 285a5ed9182SOmar Sandoval btrfs_set_free_space_flags(leaf, info, flags); 286a5ed9182SOmar Sandoval expected_extent_count = btrfs_free_space_extent_count(leaf, info); 287a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 288a5ed9182SOmar Sandoval btrfs_release_path(path); 289a5ed9182SOmar Sandoval 290a5ed9182SOmar Sandoval if (extent_count != expected_extent_count) { 2915d163e0eSJeff Mahoney btrfs_err(fs_info, 2925d163e0eSJeff Mahoney "incorrect extent count for %llu; counted %u, expected %u", 293b3470b5dSDavid Sterba block_group->start, extent_count, 294a5ed9182SOmar Sandoval expected_extent_count); 295a5ed9182SOmar Sandoval ASSERT(0); 296a5ed9182SOmar Sandoval ret = -EIO; 297a5ed9182SOmar Sandoval goto out; 298a5ed9182SOmar Sandoval } 299a5ed9182SOmar Sandoval 300a565971fSHoward McLauchlan bitmap_cursor = (char *)bitmap; 3010b246afaSJeff Mahoney bitmap_range = fs_info->sectorsize * BTRFS_FREE_SPACE_BITMAP_BITS; 302a5ed9182SOmar Sandoval i = start; 303a5ed9182SOmar Sandoval while (i < end) { 304a5ed9182SOmar Sandoval unsigned long ptr; 305a5ed9182SOmar Sandoval u64 extent_size; 306a5ed9182SOmar Sandoval u32 data_size; 307a5ed9182SOmar Sandoval 308a5ed9182SOmar Sandoval extent_size = min(end - i, bitmap_range); 309098e6308SDavid Sterba data_size = free_space_bitmap_size(fs_info, extent_size); 310a5ed9182SOmar Sandoval 311a5ed9182SOmar Sandoval key.objectid = i; 312a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_BITMAP_KEY; 313a5ed9182SOmar Sandoval key.offset = extent_size; 314a5ed9182SOmar Sandoval 315a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, 316a5ed9182SOmar Sandoval data_size); 317a5ed9182SOmar Sandoval if (ret) 318a5ed9182SOmar Sandoval goto out; 319a5ed9182SOmar Sandoval 320a5ed9182SOmar Sandoval leaf = path->nodes[0]; 321a5ed9182SOmar Sandoval ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); 322a5ed9182SOmar Sandoval write_extent_buffer(leaf, bitmap_cursor, ptr, 323a5ed9182SOmar Sandoval data_size); 324a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 325a5ed9182SOmar Sandoval btrfs_release_path(path); 326a5ed9182SOmar Sandoval 327a5ed9182SOmar Sandoval i += extent_size; 328a5ed9182SOmar Sandoval bitmap_cursor += data_size; 329a5ed9182SOmar Sandoval } 330a5ed9182SOmar Sandoval 331a5ed9182SOmar Sandoval ret = 0; 332a5ed9182SOmar Sandoval out: 33379b134a2SDavid Sterba kvfree(bitmap); 334a5ed9182SOmar Sandoval if (ret) 33566642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 336a5ed9182SOmar Sandoval return ret; 337a5ed9182SOmar Sandoval } 338a5ed9182SOmar Sandoval 339ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 340a5ed9182SOmar Sandoval int convert_free_space_to_extents(struct btrfs_trans_handle *trans, 34132da5386SDavid Sterba struct btrfs_block_group *block_group, 342a5ed9182SOmar Sandoval struct btrfs_path *path) 343a5ed9182SOmar Sandoval { 3445296c2bfSNikolay Borisov struct btrfs_fs_info *fs_info = trans->fs_info; 3457939dd9fSJosef Bacik struct btrfs_root *root = btrfs_free_space_root(block_group); 346a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 347a5ed9182SOmar Sandoval struct btrfs_key key, found_key; 348a5ed9182SOmar Sandoval struct extent_buffer *leaf; 349a565971fSHoward McLauchlan unsigned long *bitmap; 350a5ed9182SOmar Sandoval u64 start, end; 351a5ed9182SOmar Sandoval u32 bitmap_size, flags, expected_extent_count; 352a565971fSHoward McLauchlan unsigned long nrbits, start_bit, end_bit; 353a5ed9182SOmar Sandoval u32 extent_count = 0; 354a5ed9182SOmar Sandoval int done = 0, nr; 355a5ed9182SOmar Sandoval int ret; 356a5ed9182SOmar Sandoval 357098e6308SDavid Sterba bitmap_size = free_space_bitmap_size(fs_info, block_group->length); 358a5ed9182SOmar Sandoval bitmap = alloc_bitmap(bitmap_size); 359a5ed9182SOmar Sandoval if (!bitmap) { 360a5ed9182SOmar Sandoval ret = -ENOMEM; 361a5ed9182SOmar Sandoval goto out; 362a5ed9182SOmar Sandoval } 363a5ed9182SOmar Sandoval 364b3470b5dSDavid Sterba start = block_group->start; 365b3470b5dSDavid Sterba end = block_group->start + block_group->length; 366a5ed9182SOmar Sandoval 367a5ed9182SOmar Sandoval key.objectid = end - 1; 368a5ed9182SOmar Sandoval key.type = (u8)-1; 369a5ed9182SOmar Sandoval key.offset = (u64)-1; 370a5ed9182SOmar Sandoval 371a5ed9182SOmar Sandoval while (!done) { 372a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 373a5ed9182SOmar Sandoval if (ret) 374a5ed9182SOmar Sandoval goto out; 375a5ed9182SOmar Sandoval 376a5ed9182SOmar Sandoval leaf = path->nodes[0]; 377a5ed9182SOmar Sandoval nr = 0; 378a5ed9182SOmar Sandoval path->slots[0]++; 379a5ed9182SOmar Sandoval while (path->slots[0] > 0) { 380a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0] - 1); 381a5ed9182SOmar Sandoval 382a5ed9182SOmar Sandoval if (found_key.type == BTRFS_FREE_SPACE_INFO_KEY) { 383b3470b5dSDavid Sterba ASSERT(found_key.objectid == block_group->start); 384b3470b5dSDavid Sterba ASSERT(found_key.offset == block_group->length); 385a5ed9182SOmar Sandoval done = 1; 386a5ed9182SOmar Sandoval break; 387a5ed9182SOmar Sandoval } else if (found_key.type == BTRFS_FREE_SPACE_BITMAP_KEY) { 388a5ed9182SOmar Sandoval unsigned long ptr; 389a565971fSHoward McLauchlan char *bitmap_cursor; 390a5ed9182SOmar Sandoval u32 bitmap_pos, data_size; 391a5ed9182SOmar Sandoval 392a5ed9182SOmar Sandoval ASSERT(found_key.objectid >= start); 393a5ed9182SOmar Sandoval ASSERT(found_key.objectid < end); 394a5ed9182SOmar Sandoval ASSERT(found_key.objectid + found_key.offset <= end); 395a5ed9182SOmar Sandoval 396a5ed9182SOmar Sandoval bitmap_pos = div_u64(found_key.objectid - start, 3970b246afaSJeff Mahoney fs_info->sectorsize * 398a5ed9182SOmar Sandoval BITS_PER_BYTE); 399a565971fSHoward McLauchlan bitmap_cursor = ((char *)bitmap) + bitmap_pos; 400098e6308SDavid Sterba data_size = free_space_bitmap_size(fs_info, 401098e6308SDavid Sterba found_key.offset); 402a5ed9182SOmar Sandoval 403a5ed9182SOmar Sandoval ptr = btrfs_item_ptr_offset(leaf, path->slots[0] - 1); 404a5ed9182SOmar Sandoval read_extent_buffer(leaf, bitmap_cursor, ptr, 405a5ed9182SOmar Sandoval data_size); 406a5ed9182SOmar Sandoval 407a5ed9182SOmar Sandoval nr++; 408a5ed9182SOmar Sandoval path->slots[0]--; 409a5ed9182SOmar Sandoval } else { 410a5ed9182SOmar Sandoval ASSERT(0); 411a5ed9182SOmar Sandoval } 412a5ed9182SOmar Sandoval } 413a5ed9182SOmar Sandoval 414a5ed9182SOmar Sandoval ret = btrfs_del_items(trans, root, path, path->slots[0], nr); 415a5ed9182SOmar Sandoval if (ret) 416a5ed9182SOmar Sandoval goto out; 417a5ed9182SOmar Sandoval btrfs_release_path(path); 418a5ed9182SOmar Sandoval } 419a5ed9182SOmar Sandoval 4202ccf545eSDavid Sterba info = search_free_space_info(trans, block_group, path, 1); 421a5ed9182SOmar Sandoval if (IS_ERR(info)) { 422a5ed9182SOmar Sandoval ret = PTR_ERR(info); 423a5ed9182SOmar Sandoval goto out; 424a5ed9182SOmar Sandoval } 425a5ed9182SOmar Sandoval leaf = path->nodes[0]; 426a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(leaf, info); 427a5ed9182SOmar Sandoval flags &= ~BTRFS_FREE_SPACE_USING_BITMAPS; 428a5ed9182SOmar Sandoval btrfs_set_free_space_flags(leaf, info, flags); 429a5ed9182SOmar Sandoval expected_extent_count = btrfs_free_space_extent_count(leaf, info); 430a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 431a5ed9182SOmar Sandoval btrfs_release_path(path); 432a5ed9182SOmar Sandoval 433ab108d99SDavid Sterba nrbits = block_group->length >> block_group->fs_info->sectorsize_bits; 434a565971fSHoward McLauchlan start_bit = find_next_bit_le(bitmap, nrbits, 0); 435a565971fSHoward McLauchlan 436a565971fSHoward McLauchlan while (start_bit < nrbits) { 437a565971fSHoward McLauchlan end_bit = find_next_zero_bit_le(bitmap, nrbits, start_bit); 438a565971fSHoward McLauchlan ASSERT(start_bit < end_bit); 439a565971fSHoward McLauchlan 440a565971fSHoward McLauchlan key.objectid = start + start_bit * block_group->fs_info->sectorsize; 441a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_EXTENT_KEY; 442a565971fSHoward McLauchlan key.offset = (end_bit - start_bit) * block_group->fs_info->sectorsize; 443a5ed9182SOmar Sandoval 444a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, 0); 445a5ed9182SOmar Sandoval if (ret) 446a5ed9182SOmar Sandoval goto out; 447a5ed9182SOmar Sandoval btrfs_release_path(path); 448a5ed9182SOmar Sandoval 449a5ed9182SOmar Sandoval extent_count++; 450a5ed9182SOmar Sandoval 451a565971fSHoward McLauchlan start_bit = find_next_bit_le(bitmap, nrbits, end_bit); 452a5ed9182SOmar Sandoval } 453a5ed9182SOmar Sandoval 454a5ed9182SOmar Sandoval if (extent_count != expected_extent_count) { 4555d163e0eSJeff Mahoney btrfs_err(fs_info, 4565d163e0eSJeff Mahoney "incorrect extent count for %llu; counted %u, expected %u", 457b3470b5dSDavid Sterba block_group->start, extent_count, 458a5ed9182SOmar Sandoval expected_extent_count); 459a5ed9182SOmar Sandoval ASSERT(0); 460a5ed9182SOmar Sandoval ret = -EIO; 461a5ed9182SOmar Sandoval goto out; 462a5ed9182SOmar Sandoval } 463a5ed9182SOmar Sandoval 464a5ed9182SOmar Sandoval ret = 0; 465a5ed9182SOmar Sandoval out: 46679b134a2SDavid Sterba kvfree(bitmap); 467a5ed9182SOmar Sandoval if (ret) 46866642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 469a5ed9182SOmar Sandoval return ret; 470a5ed9182SOmar Sandoval } 471a5ed9182SOmar Sandoval 472a5ed9182SOmar Sandoval static int update_free_space_extent_count(struct btrfs_trans_handle *trans, 47332da5386SDavid Sterba struct btrfs_block_group *block_group, 474a5ed9182SOmar Sandoval struct btrfs_path *path, 475a5ed9182SOmar Sandoval int new_extents) 476a5ed9182SOmar Sandoval { 477a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 478a5ed9182SOmar Sandoval u32 flags; 479a5ed9182SOmar Sandoval u32 extent_count; 480a5ed9182SOmar Sandoval int ret = 0; 481a5ed9182SOmar Sandoval 482a5ed9182SOmar Sandoval if (new_extents == 0) 483a5ed9182SOmar Sandoval return 0; 484a5ed9182SOmar Sandoval 4852ccf545eSDavid Sterba info = search_free_space_info(trans, block_group, path, 1); 486a5ed9182SOmar Sandoval if (IS_ERR(info)) { 487a5ed9182SOmar Sandoval ret = PTR_ERR(info); 488a5ed9182SOmar Sandoval goto out; 489a5ed9182SOmar Sandoval } 490a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(path->nodes[0], info); 491a5ed9182SOmar Sandoval extent_count = btrfs_free_space_extent_count(path->nodes[0], info); 492a5ed9182SOmar Sandoval 493a5ed9182SOmar Sandoval extent_count += new_extents; 494a5ed9182SOmar Sandoval btrfs_set_free_space_extent_count(path->nodes[0], info, extent_count); 495a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(path->nodes[0]); 496a5ed9182SOmar Sandoval btrfs_release_path(path); 497a5ed9182SOmar Sandoval 498a5ed9182SOmar Sandoval if (!(flags & BTRFS_FREE_SPACE_USING_BITMAPS) && 499a5ed9182SOmar Sandoval extent_count > block_group->bitmap_high_thresh) { 500719fb4deSNikolay Borisov ret = convert_free_space_to_bitmaps(trans, block_group, path); 501a5ed9182SOmar Sandoval } else if ((flags & BTRFS_FREE_SPACE_USING_BITMAPS) && 502a5ed9182SOmar Sandoval extent_count < block_group->bitmap_low_thresh) { 5035296c2bfSNikolay Borisov ret = convert_free_space_to_extents(trans, block_group, path); 504a5ed9182SOmar Sandoval } 505a5ed9182SOmar Sandoval 506a5ed9182SOmar Sandoval out: 507a5ed9182SOmar Sandoval return ret; 508a5ed9182SOmar Sandoval } 509a5ed9182SOmar Sandoval 510ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 51132da5386SDavid Sterba int free_space_test_bit(struct btrfs_block_group *block_group, 512a5ed9182SOmar Sandoval struct btrfs_path *path, u64 offset) 513a5ed9182SOmar Sandoval { 514a5ed9182SOmar Sandoval struct extent_buffer *leaf; 515a5ed9182SOmar Sandoval struct btrfs_key key; 516a5ed9182SOmar Sandoval u64 found_start, found_end; 517a5ed9182SOmar Sandoval unsigned long ptr, i; 518a5ed9182SOmar Sandoval 519a5ed9182SOmar Sandoval leaf = path->nodes[0]; 520a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); 521a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_BITMAP_KEY); 522a5ed9182SOmar Sandoval 523a5ed9182SOmar Sandoval found_start = key.objectid; 524a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 525a5ed9182SOmar Sandoval ASSERT(offset >= found_start && offset < found_end); 526a5ed9182SOmar Sandoval 527a5ed9182SOmar Sandoval ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); 528da17066cSJeff Mahoney i = div_u64(offset - found_start, 529da17066cSJeff Mahoney block_group->fs_info->sectorsize); 530a5ed9182SOmar Sandoval return !!extent_buffer_test_bit(leaf, ptr, i); 531a5ed9182SOmar Sandoval } 532a5ed9182SOmar Sandoval 53332da5386SDavid Sterba static void free_space_set_bits(struct btrfs_block_group *block_group, 534a5ed9182SOmar Sandoval struct btrfs_path *path, u64 *start, u64 *size, 535a5ed9182SOmar Sandoval int bit) 536a5ed9182SOmar Sandoval { 5370b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = block_group->fs_info; 538a5ed9182SOmar Sandoval struct extent_buffer *leaf; 539a5ed9182SOmar Sandoval struct btrfs_key key; 540a5ed9182SOmar Sandoval u64 end = *start + *size; 541a5ed9182SOmar Sandoval u64 found_start, found_end; 542a5ed9182SOmar Sandoval unsigned long ptr, first, last; 543a5ed9182SOmar Sandoval 544a5ed9182SOmar Sandoval leaf = path->nodes[0]; 545a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); 546a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_BITMAP_KEY); 547a5ed9182SOmar Sandoval 548a5ed9182SOmar Sandoval found_start = key.objectid; 549a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 550a5ed9182SOmar Sandoval ASSERT(*start >= found_start && *start < found_end); 551a5ed9182SOmar Sandoval ASSERT(end > found_start); 552a5ed9182SOmar Sandoval 553a5ed9182SOmar Sandoval if (end > found_end) 554a5ed9182SOmar Sandoval end = found_end; 555a5ed9182SOmar Sandoval 556a5ed9182SOmar Sandoval ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); 557ab108d99SDavid Sterba first = (*start - found_start) >> fs_info->sectorsize_bits; 558ab108d99SDavid Sterba last = (end - found_start) >> fs_info->sectorsize_bits; 559a5ed9182SOmar Sandoval if (bit) 560a5ed9182SOmar Sandoval extent_buffer_bitmap_set(leaf, ptr, first, last - first); 561a5ed9182SOmar Sandoval else 562a5ed9182SOmar Sandoval extent_buffer_bitmap_clear(leaf, ptr, first, last - first); 563a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 564a5ed9182SOmar Sandoval 565a5ed9182SOmar Sandoval *size -= end - *start; 566a5ed9182SOmar Sandoval *start = end; 567a5ed9182SOmar Sandoval } 568a5ed9182SOmar Sandoval 569a5ed9182SOmar Sandoval /* 570a5ed9182SOmar Sandoval * We can't use btrfs_next_item() in modify_free_space_bitmap() because 571a5ed9182SOmar Sandoval * btrfs_next_leaf() doesn't get the path for writing. We can forgo the fancy 572a5ed9182SOmar Sandoval * tree walking in btrfs_next_leaf() anyways because we know exactly what we're 573a5ed9182SOmar Sandoval * looking for. 574a5ed9182SOmar Sandoval */ 575a5ed9182SOmar Sandoval static int free_space_next_bitmap(struct btrfs_trans_handle *trans, 576a5ed9182SOmar Sandoval struct btrfs_root *root, struct btrfs_path *p) 577a5ed9182SOmar Sandoval { 578a5ed9182SOmar Sandoval struct btrfs_key key; 579a5ed9182SOmar Sandoval 580a5ed9182SOmar Sandoval if (p->slots[0] + 1 < btrfs_header_nritems(p->nodes[0])) { 581a5ed9182SOmar Sandoval p->slots[0]++; 582a5ed9182SOmar Sandoval return 0; 583a5ed9182SOmar Sandoval } 584a5ed9182SOmar Sandoval 585a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(p->nodes[0], &key, p->slots[0]); 586a5ed9182SOmar Sandoval btrfs_release_path(p); 587a5ed9182SOmar Sandoval 588a5ed9182SOmar Sandoval key.objectid += key.offset; 589a5ed9182SOmar Sandoval key.type = (u8)-1; 590a5ed9182SOmar Sandoval key.offset = (u64)-1; 591a5ed9182SOmar Sandoval 592a5ed9182SOmar Sandoval return btrfs_search_prev_slot(trans, root, &key, p, 0, 1); 593a5ed9182SOmar Sandoval } 594a5ed9182SOmar Sandoval 595a5ed9182SOmar Sandoval /* 596a5ed9182SOmar Sandoval * If remove is 1, then we are removing free space, thus clearing bits in the 597a5ed9182SOmar Sandoval * bitmap. If remove is 0, then we are adding free space, thus setting bits in 598a5ed9182SOmar Sandoval * the bitmap. 599a5ed9182SOmar Sandoval */ 600a5ed9182SOmar Sandoval static int modify_free_space_bitmap(struct btrfs_trans_handle *trans, 60132da5386SDavid Sterba struct btrfs_block_group *block_group, 602a5ed9182SOmar Sandoval struct btrfs_path *path, 603a5ed9182SOmar Sandoval u64 start, u64 size, int remove) 604a5ed9182SOmar Sandoval { 6057939dd9fSJosef Bacik struct btrfs_root *root = btrfs_free_space_root(block_group); 606a5ed9182SOmar Sandoval struct btrfs_key key; 607a5ed9182SOmar Sandoval u64 end = start + size; 608a5ed9182SOmar Sandoval u64 cur_start, cur_size; 609a5ed9182SOmar Sandoval int prev_bit, next_bit; 610a5ed9182SOmar Sandoval int new_extents; 611a5ed9182SOmar Sandoval int ret; 612a5ed9182SOmar Sandoval 613a5ed9182SOmar Sandoval /* 614a5ed9182SOmar Sandoval * Read the bit for the block immediately before the extent of space if 615a5ed9182SOmar Sandoval * that block is within the block group. 616a5ed9182SOmar Sandoval */ 617b3470b5dSDavid Sterba if (start > block_group->start) { 618da17066cSJeff Mahoney u64 prev_block = start - block_group->fs_info->sectorsize; 619a5ed9182SOmar Sandoval 620a5ed9182SOmar Sandoval key.objectid = prev_block; 621a5ed9182SOmar Sandoval key.type = (u8)-1; 622a5ed9182SOmar Sandoval key.offset = (u64)-1; 623a5ed9182SOmar Sandoval 624a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, 0, 1); 625a5ed9182SOmar Sandoval if (ret) 626a5ed9182SOmar Sandoval goto out; 627a5ed9182SOmar Sandoval 628a5ed9182SOmar Sandoval prev_bit = free_space_test_bit(block_group, path, prev_block); 629a5ed9182SOmar Sandoval 630a5ed9182SOmar Sandoval /* The previous block may have been in the previous bitmap. */ 631a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 632a5ed9182SOmar Sandoval if (start >= key.objectid + key.offset) { 633a5ed9182SOmar Sandoval ret = free_space_next_bitmap(trans, root, path); 634a5ed9182SOmar Sandoval if (ret) 635a5ed9182SOmar Sandoval goto out; 636a5ed9182SOmar Sandoval } 637a5ed9182SOmar Sandoval } else { 638a5ed9182SOmar Sandoval key.objectid = start; 639a5ed9182SOmar Sandoval key.type = (u8)-1; 640a5ed9182SOmar Sandoval key.offset = (u64)-1; 641a5ed9182SOmar Sandoval 642a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, 0, 1); 643a5ed9182SOmar Sandoval if (ret) 644a5ed9182SOmar Sandoval goto out; 645a5ed9182SOmar Sandoval 646a5ed9182SOmar Sandoval prev_bit = -1; 647a5ed9182SOmar Sandoval } 648a5ed9182SOmar Sandoval 649a5ed9182SOmar Sandoval /* 650a5ed9182SOmar Sandoval * Iterate over all of the bitmaps overlapped by the extent of space, 651a5ed9182SOmar Sandoval * clearing/setting bits as required. 652a5ed9182SOmar Sandoval */ 653a5ed9182SOmar Sandoval cur_start = start; 654a5ed9182SOmar Sandoval cur_size = size; 655a5ed9182SOmar Sandoval while (1) { 656a5ed9182SOmar Sandoval free_space_set_bits(block_group, path, &cur_start, &cur_size, 657a5ed9182SOmar Sandoval !remove); 658a5ed9182SOmar Sandoval if (cur_size == 0) 659a5ed9182SOmar Sandoval break; 660a5ed9182SOmar Sandoval ret = free_space_next_bitmap(trans, root, path); 661a5ed9182SOmar Sandoval if (ret) 662a5ed9182SOmar Sandoval goto out; 663a5ed9182SOmar Sandoval } 664a5ed9182SOmar Sandoval 665a5ed9182SOmar Sandoval /* 666a5ed9182SOmar Sandoval * Read the bit for the block immediately after the extent of space if 667a5ed9182SOmar Sandoval * that block is within the block group. 668a5ed9182SOmar Sandoval */ 669b3470b5dSDavid Sterba if (end < block_group->start + block_group->length) { 670a5ed9182SOmar Sandoval /* The next block may be in the next bitmap. */ 671a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 672a5ed9182SOmar Sandoval if (end >= key.objectid + key.offset) { 673a5ed9182SOmar Sandoval ret = free_space_next_bitmap(trans, root, path); 674a5ed9182SOmar Sandoval if (ret) 675a5ed9182SOmar Sandoval goto out; 676a5ed9182SOmar Sandoval } 677a5ed9182SOmar Sandoval 678a5ed9182SOmar Sandoval next_bit = free_space_test_bit(block_group, path, end); 679a5ed9182SOmar Sandoval } else { 680a5ed9182SOmar Sandoval next_bit = -1; 681a5ed9182SOmar Sandoval } 682a5ed9182SOmar Sandoval 683a5ed9182SOmar Sandoval if (remove) { 684a5ed9182SOmar Sandoval new_extents = -1; 685a5ed9182SOmar Sandoval if (prev_bit == 1) { 686a5ed9182SOmar Sandoval /* Leftover on the left. */ 687a5ed9182SOmar Sandoval new_extents++; 688a5ed9182SOmar Sandoval } 689a5ed9182SOmar Sandoval if (next_bit == 1) { 690a5ed9182SOmar Sandoval /* Leftover on the right. */ 691a5ed9182SOmar Sandoval new_extents++; 692a5ed9182SOmar Sandoval } 693a5ed9182SOmar Sandoval } else { 694a5ed9182SOmar Sandoval new_extents = 1; 695a5ed9182SOmar Sandoval if (prev_bit == 1) { 696a5ed9182SOmar Sandoval /* Merging with neighbor on the left. */ 697a5ed9182SOmar Sandoval new_extents--; 698a5ed9182SOmar Sandoval } 699a5ed9182SOmar Sandoval if (next_bit == 1) { 700a5ed9182SOmar Sandoval /* Merging with neighbor on the right. */ 701a5ed9182SOmar Sandoval new_extents--; 702a5ed9182SOmar Sandoval } 703a5ed9182SOmar Sandoval } 704a5ed9182SOmar Sandoval 705a5ed9182SOmar Sandoval btrfs_release_path(path); 706690d7682SNikolay Borisov ret = update_free_space_extent_count(trans, block_group, path, 707a5ed9182SOmar Sandoval new_extents); 708a5ed9182SOmar Sandoval 709a5ed9182SOmar Sandoval out: 710a5ed9182SOmar Sandoval return ret; 711a5ed9182SOmar Sandoval } 712a5ed9182SOmar Sandoval 713a5ed9182SOmar Sandoval static int remove_free_space_extent(struct btrfs_trans_handle *trans, 71432da5386SDavid Sterba struct btrfs_block_group *block_group, 715a5ed9182SOmar Sandoval struct btrfs_path *path, 716a5ed9182SOmar Sandoval u64 start, u64 size) 717a5ed9182SOmar Sandoval { 7187939dd9fSJosef Bacik struct btrfs_root *root = btrfs_free_space_root(block_group); 719a5ed9182SOmar Sandoval struct btrfs_key key; 720a5ed9182SOmar Sandoval u64 found_start, found_end; 721a5ed9182SOmar Sandoval u64 end = start + size; 722a5ed9182SOmar Sandoval int new_extents = -1; 723a5ed9182SOmar Sandoval int ret; 724a5ed9182SOmar Sandoval 725a5ed9182SOmar Sandoval key.objectid = start; 726a5ed9182SOmar Sandoval key.type = (u8)-1; 727a5ed9182SOmar Sandoval key.offset = (u64)-1; 728a5ed9182SOmar Sandoval 729a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 730a5ed9182SOmar Sandoval if (ret) 731a5ed9182SOmar Sandoval goto out; 732a5ed9182SOmar Sandoval 733a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 734a5ed9182SOmar Sandoval 735a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_EXTENT_KEY); 736a5ed9182SOmar Sandoval 737a5ed9182SOmar Sandoval found_start = key.objectid; 738a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 739a5ed9182SOmar Sandoval ASSERT(start >= found_start && end <= found_end); 740a5ed9182SOmar Sandoval 741a5ed9182SOmar Sandoval /* 742a5ed9182SOmar Sandoval * Okay, now that we've found the free space extent which contains the 743a5ed9182SOmar Sandoval * free space that we are removing, there are four cases: 744a5ed9182SOmar Sandoval * 745a5ed9182SOmar Sandoval * 1. We're using the whole extent: delete the key we found and 746a5ed9182SOmar Sandoval * decrement the free space extent count. 747a5ed9182SOmar Sandoval * 2. We are using part of the extent starting at the beginning: delete 748a5ed9182SOmar Sandoval * the key we found and insert a new key representing the leftover at 749a5ed9182SOmar Sandoval * the end. There is no net change in the number of extents. 750a5ed9182SOmar Sandoval * 3. We are using part of the extent ending at the end: delete the key 751a5ed9182SOmar Sandoval * we found and insert a new key representing the leftover at the 752a5ed9182SOmar Sandoval * beginning. There is no net change in the number of extents. 753a5ed9182SOmar Sandoval * 4. We are using part of the extent in the middle: delete the key we 754a5ed9182SOmar Sandoval * found and insert two new keys representing the leftovers on each 755a5ed9182SOmar Sandoval * side. Where we used to have one extent, we now have two, so increment 756a5ed9182SOmar Sandoval * the extent count. We may need to convert the block group to bitmaps 757a5ed9182SOmar Sandoval * as a result. 758a5ed9182SOmar Sandoval */ 759a5ed9182SOmar Sandoval 760a5ed9182SOmar Sandoval /* Delete the existing key (cases 1-4). */ 761a5ed9182SOmar Sandoval ret = btrfs_del_item(trans, root, path); 762a5ed9182SOmar Sandoval if (ret) 763a5ed9182SOmar Sandoval goto out; 764a5ed9182SOmar Sandoval 765a5ed9182SOmar Sandoval /* Add a key for leftovers at the beginning (cases 3 and 4). */ 766a5ed9182SOmar Sandoval if (start > found_start) { 767a5ed9182SOmar Sandoval key.objectid = found_start; 768a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_EXTENT_KEY; 769a5ed9182SOmar Sandoval key.offset = start - found_start; 770a5ed9182SOmar Sandoval 771a5ed9182SOmar Sandoval btrfs_release_path(path); 772a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, 0); 773a5ed9182SOmar Sandoval if (ret) 774a5ed9182SOmar Sandoval goto out; 775a5ed9182SOmar Sandoval new_extents++; 776a5ed9182SOmar Sandoval } 777a5ed9182SOmar Sandoval 778a5ed9182SOmar Sandoval /* Add a key for leftovers at the end (cases 2 and 4). */ 779a5ed9182SOmar Sandoval if (end < found_end) { 780a5ed9182SOmar Sandoval key.objectid = end; 781a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_EXTENT_KEY; 782a5ed9182SOmar Sandoval key.offset = found_end - end; 783a5ed9182SOmar Sandoval 784a5ed9182SOmar Sandoval btrfs_release_path(path); 785a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, 0); 786a5ed9182SOmar Sandoval if (ret) 787a5ed9182SOmar Sandoval goto out; 788a5ed9182SOmar Sandoval new_extents++; 789a5ed9182SOmar Sandoval } 790a5ed9182SOmar Sandoval 791a5ed9182SOmar Sandoval btrfs_release_path(path); 792690d7682SNikolay Borisov ret = update_free_space_extent_count(trans, block_group, path, 793a5ed9182SOmar Sandoval new_extents); 794a5ed9182SOmar Sandoval 795a5ed9182SOmar Sandoval out: 796a5ed9182SOmar Sandoval return ret; 797a5ed9182SOmar Sandoval } 798a5ed9182SOmar Sandoval 799ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 800a5ed9182SOmar Sandoval int __remove_from_free_space_tree(struct btrfs_trans_handle *trans, 80132da5386SDavid Sterba struct btrfs_block_group *block_group, 802a5ed9182SOmar Sandoval struct btrfs_path *path, u64 start, u64 size) 803a5ed9182SOmar Sandoval { 804a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 805a5ed9182SOmar Sandoval u32 flags; 806a5ed9182SOmar Sandoval int ret; 807a5ed9182SOmar Sandoval 808a5ed9182SOmar Sandoval if (block_group->needs_free_space) { 8099a7e0f92SNikolay Borisov ret = __add_block_group_free_space(trans, block_group, path); 810a5ed9182SOmar Sandoval if (ret) 811a5ed9182SOmar Sandoval return ret; 812a5ed9182SOmar Sandoval } 813a5ed9182SOmar Sandoval 8142ccf545eSDavid Sterba info = search_free_space_info(NULL, block_group, path, 0); 815a5ed9182SOmar Sandoval if (IS_ERR(info)) 816a5ed9182SOmar Sandoval return PTR_ERR(info); 817a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(path->nodes[0], info); 818a5ed9182SOmar Sandoval btrfs_release_path(path); 819a5ed9182SOmar Sandoval 820a5ed9182SOmar Sandoval if (flags & BTRFS_FREE_SPACE_USING_BITMAPS) { 82185a7ef13SNikolay Borisov return modify_free_space_bitmap(trans, block_group, path, 82285a7ef13SNikolay Borisov start, size, 1); 823a5ed9182SOmar Sandoval } else { 824e581168dSNikolay Borisov return remove_free_space_extent(trans, block_group, path, 825e581168dSNikolay Borisov start, size); 826a5ed9182SOmar Sandoval } 827a5ed9182SOmar Sandoval } 828a5ed9182SOmar Sandoval 829a5ed9182SOmar Sandoval int remove_from_free_space_tree(struct btrfs_trans_handle *trans, 830a5ed9182SOmar Sandoval u64 start, u64 size) 831a5ed9182SOmar Sandoval { 83232da5386SDavid Sterba struct btrfs_block_group *block_group; 833a5ed9182SOmar Sandoval struct btrfs_path *path; 834a5ed9182SOmar Sandoval int ret; 835a5ed9182SOmar Sandoval 83625a356d3SNikolay Borisov if (!btrfs_fs_compat_ro(trans->fs_info, FREE_SPACE_TREE)) 837a5ed9182SOmar Sandoval return 0; 838a5ed9182SOmar Sandoval 839a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 840a5ed9182SOmar Sandoval if (!path) { 841a5ed9182SOmar Sandoval ret = -ENOMEM; 842a5ed9182SOmar Sandoval goto out; 843a5ed9182SOmar Sandoval } 844a5ed9182SOmar Sandoval 84525a356d3SNikolay Borisov block_group = btrfs_lookup_block_group(trans->fs_info, start); 846a5ed9182SOmar Sandoval if (!block_group) { 847a5ed9182SOmar Sandoval ASSERT(0); 848a5ed9182SOmar Sandoval ret = -ENOENT; 849a5ed9182SOmar Sandoval goto out; 850a5ed9182SOmar Sandoval } 851a5ed9182SOmar Sandoval 852a5ed9182SOmar Sandoval mutex_lock(&block_group->free_space_lock); 853c31683a6SNikolay Borisov ret = __remove_from_free_space_tree(trans, block_group, path, start, 854c31683a6SNikolay Borisov size); 855a5ed9182SOmar Sandoval mutex_unlock(&block_group->free_space_lock); 856a5ed9182SOmar Sandoval 857a5ed9182SOmar Sandoval btrfs_put_block_group(block_group); 858a5ed9182SOmar Sandoval out: 859a5ed9182SOmar Sandoval btrfs_free_path(path); 860a5ed9182SOmar Sandoval if (ret) 86166642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 862a5ed9182SOmar Sandoval return ret; 863a5ed9182SOmar Sandoval } 864a5ed9182SOmar Sandoval 865a5ed9182SOmar Sandoval static int add_free_space_extent(struct btrfs_trans_handle *trans, 86632da5386SDavid Sterba struct btrfs_block_group *block_group, 867a5ed9182SOmar Sandoval struct btrfs_path *path, 868a5ed9182SOmar Sandoval u64 start, u64 size) 869a5ed9182SOmar Sandoval { 8707939dd9fSJosef Bacik struct btrfs_root *root = btrfs_free_space_root(block_group); 871a5ed9182SOmar Sandoval struct btrfs_key key, new_key; 872a5ed9182SOmar Sandoval u64 found_start, found_end; 873a5ed9182SOmar Sandoval u64 end = start + size; 874a5ed9182SOmar Sandoval int new_extents = 1; 875a5ed9182SOmar Sandoval int ret; 876a5ed9182SOmar Sandoval 877a5ed9182SOmar Sandoval /* 878a5ed9182SOmar Sandoval * We are adding a new extent of free space, but we need to merge 879a5ed9182SOmar Sandoval * extents. There are four cases here: 880a5ed9182SOmar Sandoval * 881a5ed9182SOmar Sandoval * 1. The new extent does not have any immediate neighbors to merge 882a5ed9182SOmar Sandoval * with: add the new key and increment the free space extent count. We 883a5ed9182SOmar Sandoval * may need to convert the block group to bitmaps as a result. 884a5ed9182SOmar Sandoval * 2. The new extent has an immediate neighbor before it: remove the 885a5ed9182SOmar Sandoval * previous key and insert a new key combining both of them. There is no 886a5ed9182SOmar Sandoval * net change in the number of extents. 887a5ed9182SOmar Sandoval * 3. The new extent has an immediate neighbor after it: remove the next 888a5ed9182SOmar Sandoval * key and insert a new key combining both of them. There is no net 889a5ed9182SOmar Sandoval * change in the number of extents. 890a5ed9182SOmar Sandoval * 4. The new extent has immediate neighbors on both sides: remove both 891a5ed9182SOmar Sandoval * of the keys and insert a new key combining all of them. Where we used 892a5ed9182SOmar Sandoval * to have two extents, we now have one, so decrement the extent count. 893a5ed9182SOmar Sandoval */ 894a5ed9182SOmar Sandoval 895a5ed9182SOmar Sandoval new_key.objectid = start; 896a5ed9182SOmar Sandoval new_key.type = BTRFS_FREE_SPACE_EXTENT_KEY; 897a5ed9182SOmar Sandoval new_key.offset = size; 898a5ed9182SOmar Sandoval 899a5ed9182SOmar Sandoval /* Search for a neighbor on the left. */ 900b3470b5dSDavid Sterba if (start == block_group->start) 901a5ed9182SOmar Sandoval goto right; 902a5ed9182SOmar Sandoval key.objectid = start - 1; 903a5ed9182SOmar Sandoval key.type = (u8)-1; 904a5ed9182SOmar Sandoval key.offset = (u64)-1; 905a5ed9182SOmar Sandoval 906a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 907a5ed9182SOmar Sandoval if (ret) 908a5ed9182SOmar Sandoval goto out; 909a5ed9182SOmar Sandoval 910a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 911a5ed9182SOmar Sandoval 912a5ed9182SOmar Sandoval if (key.type != BTRFS_FREE_SPACE_EXTENT_KEY) { 913a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_INFO_KEY); 914a5ed9182SOmar Sandoval btrfs_release_path(path); 915a5ed9182SOmar Sandoval goto right; 916a5ed9182SOmar Sandoval } 917a5ed9182SOmar Sandoval 918a5ed9182SOmar Sandoval found_start = key.objectid; 919a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 920b3470b5dSDavid Sterba ASSERT(found_start >= block_group->start && 921b3470b5dSDavid Sterba found_end > block_group->start); 922a5ed9182SOmar Sandoval ASSERT(found_start < start && found_end <= start); 923a5ed9182SOmar Sandoval 924a5ed9182SOmar Sandoval /* 925a5ed9182SOmar Sandoval * Delete the neighbor on the left and absorb it into the new key (cases 926a5ed9182SOmar Sandoval * 2 and 4). 927a5ed9182SOmar Sandoval */ 928a5ed9182SOmar Sandoval if (found_end == start) { 929a5ed9182SOmar Sandoval ret = btrfs_del_item(trans, root, path); 930a5ed9182SOmar Sandoval if (ret) 931a5ed9182SOmar Sandoval goto out; 932a5ed9182SOmar Sandoval new_key.objectid = found_start; 933a5ed9182SOmar Sandoval new_key.offset += key.offset; 934a5ed9182SOmar Sandoval new_extents--; 935a5ed9182SOmar Sandoval } 936a5ed9182SOmar Sandoval btrfs_release_path(path); 937a5ed9182SOmar Sandoval 938a5ed9182SOmar Sandoval right: 939a5ed9182SOmar Sandoval /* Search for a neighbor on the right. */ 940b3470b5dSDavid Sterba if (end == block_group->start + block_group->length) 941a5ed9182SOmar Sandoval goto insert; 942a5ed9182SOmar Sandoval key.objectid = end; 943a5ed9182SOmar Sandoval key.type = (u8)-1; 944a5ed9182SOmar Sandoval key.offset = (u64)-1; 945a5ed9182SOmar Sandoval 946a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 947a5ed9182SOmar Sandoval if (ret) 948a5ed9182SOmar Sandoval goto out; 949a5ed9182SOmar Sandoval 950a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 951a5ed9182SOmar Sandoval 952a5ed9182SOmar Sandoval if (key.type != BTRFS_FREE_SPACE_EXTENT_KEY) { 953a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_INFO_KEY); 954a5ed9182SOmar Sandoval btrfs_release_path(path); 955a5ed9182SOmar Sandoval goto insert; 956a5ed9182SOmar Sandoval } 957a5ed9182SOmar Sandoval 958a5ed9182SOmar Sandoval found_start = key.objectid; 959a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 960b3470b5dSDavid Sterba ASSERT(found_start >= block_group->start && 961b3470b5dSDavid Sterba found_end > block_group->start); 962a5ed9182SOmar Sandoval ASSERT((found_start < start && found_end <= start) || 963a5ed9182SOmar Sandoval (found_start >= end && found_end > end)); 964a5ed9182SOmar Sandoval 965a5ed9182SOmar Sandoval /* 966a5ed9182SOmar Sandoval * Delete the neighbor on the right and absorb it into the new key 967a5ed9182SOmar Sandoval * (cases 3 and 4). 968a5ed9182SOmar Sandoval */ 969a5ed9182SOmar Sandoval if (found_start == end) { 970a5ed9182SOmar Sandoval ret = btrfs_del_item(trans, root, path); 971a5ed9182SOmar Sandoval if (ret) 972a5ed9182SOmar Sandoval goto out; 973a5ed9182SOmar Sandoval new_key.offset += key.offset; 974a5ed9182SOmar Sandoval new_extents--; 975a5ed9182SOmar Sandoval } 976a5ed9182SOmar Sandoval btrfs_release_path(path); 977a5ed9182SOmar Sandoval 978a5ed9182SOmar Sandoval insert: 979a5ed9182SOmar Sandoval /* Insert the new key (cases 1-4). */ 980a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &new_key, 0); 981a5ed9182SOmar Sandoval if (ret) 982a5ed9182SOmar Sandoval goto out; 983a5ed9182SOmar Sandoval 984a5ed9182SOmar Sandoval btrfs_release_path(path); 985690d7682SNikolay Borisov ret = update_free_space_extent_count(trans, block_group, path, 986a5ed9182SOmar Sandoval new_extents); 987a5ed9182SOmar Sandoval 988a5ed9182SOmar Sandoval out: 989a5ed9182SOmar Sandoval return ret; 990a5ed9182SOmar Sandoval } 991a5ed9182SOmar Sandoval 992ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 993a5ed9182SOmar Sandoval int __add_to_free_space_tree(struct btrfs_trans_handle *trans, 99432da5386SDavid Sterba struct btrfs_block_group *block_group, 995a5ed9182SOmar Sandoval struct btrfs_path *path, u64 start, u64 size) 996a5ed9182SOmar Sandoval { 997a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 998a5ed9182SOmar Sandoval u32 flags; 999a5ed9182SOmar Sandoval int ret; 1000a5ed9182SOmar Sandoval 1001a5ed9182SOmar Sandoval if (block_group->needs_free_space) { 10029a7e0f92SNikolay Borisov ret = __add_block_group_free_space(trans, block_group, path); 1003a5ed9182SOmar Sandoval if (ret) 1004a5ed9182SOmar Sandoval return ret; 1005a5ed9182SOmar Sandoval } 1006a5ed9182SOmar Sandoval 10072ccf545eSDavid Sterba info = search_free_space_info(NULL, block_group, path, 0); 1008a5ed9182SOmar Sandoval if (IS_ERR(info)) 1009a5ed9182SOmar Sandoval return PTR_ERR(info); 1010a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(path->nodes[0], info); 1011a5ed9182SOmar Sandoval btrfs_release_path(path); 1012a5ed9182SOmar Sandoval 1013a5ed9182SOmar Sandoval if (flags & BTRFS_FREE_SPACE_USING_BITMAPS) { 101485a7ef13SNikolay Borisov return modify_free_space_bitmap(trans, block_group, path, 101585a7ef13SNikolay Borisov start, size, 0); 1016a5ed9182SOmar Sandoval } else { 10175cb17822SNikolay Borisov return add_free_space_extent(trans, block_group, path, start, 10185cb17822SNikolay Borisov size); 1019a5ed9182SOmar Sandoval } 1020a5ed9182SOmar Sandoval } 1021a5ed9182SOmar Sandoval 1022a5ed9182SOmar Sandoval int add_to_free_space_tree(struct btrfs_trans_handle *trans, 1023a5ed9182SOmar Sandoval u64 start, u64 size) 1024a5ed9182SOmar Sandoval { 102532da5386SDavid Sterba struct btrfs_block_group *block_group; 1026a5ed9182SOmar Sandoval struct btrfs_path *path; 1027a5ed9182SOmar Sandoval int ret; 1028a5ed9182SOmar Sandoval 1029e7355e50SNikolay Borisov if (!btrfs_fs_compat_ro(trans->fs_info, FREE_SPACE_TREE)) 1030a5ed9182SOmar Sandoval return 0; 1031a5ed9182SOmar Sandoval 1032a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1033a5ed9182SOmar Sandoval if (!path) { 1034a5ed9182SOmar Sandoval ret = -ENOMEM; 1035a5ed9182SOmar Sandoval goto out; 1036a5ed9182SOmar Sandoval } 1037a5ed9182SOmar Sandoval 1038e7355e50SNikolay Borisov block_group = btrfs_lookup_block_group(trans->fs_info, start); 1039a5ed9182SOmar Sandoval if (!block_group) { 1040a5ed9182SOmar Sandoval ASSERT(0); 1041a5ed9182SOmar Sandoval ret = -ENOENT; 1042a5ed9182SOmar Sandoval goto out; 1043a5ed9182SOmar Sandoval } 1044a5ed9182SOmar Sandoval 1045a5ed9182SOmar Sandoval mutex_lock(&block_group->free_space_lock); 10462d5cffa1SNikolay Borisov ret = __add_to_free_space_tree(trans, block_group, path, start, size); 1047a5ed9182SOmar Sandoval mutex_unlock(&block_group->free_space_lock); 1048a5ed9182SOmar Sandoval 1049a5ed9182SOmar Sandoval btrfs_put_block_group(block_group); 1050a5ed9182SOmar Sandoval out: 1051a5ed9182SOmar Sandoval btrfs_free_path(path); 1052a5ed9182SOmar Sandoval if (ret) 105366642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 1054a5ed9182SOmar Sandoval return ret; 1055a5ed9182SOmar Sandoval } 1056a5ed9182SOmar Sandoval 1057a5ed9182SOmar Sandoval /* 1058a5ed9182SOmar Sandoval * Populate the free space tree by walking the extent tree. Operations on the 1059a5ed9182SOmar Sandoval * extent tree that happen as a result of writes to the free space tree will go 1060a5ed9182SOmar Sandoval * through the normal add/remove hooks. 1061a5ed9182SOmar Sandoval */ 1062a5ed9182SOmar Sandoval static int populate_free_space_tree(struct btrfs_trans_handle *trans, 106332da5386SDavid Sterba struct btrfs_block_group *block_group) 1064a5ed9182SOmar Sandoval { 106529cbcf40SJosef Bacik struct btrfs_root *extent_root; 1066a5ed9182SOmar Sandoval struct btrfs_path *path, *path2; 1067a5ed9182SOmar Sandoval struct btrfs_key key; 1068a5ed9182SOmar Sandoval u64 start, end; 1069a5ed9182SOmar Sandoval int ret; 1070a5ed9182SOmar Sandoval 1071a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1072a5ed9182SOmar Sandoval if (!path) 1073a5ed9182SOmar Sandoval return -ENOMEM; 1074019599adSGu Jinxiang path->reada = READA_FORWARD; 1075a5ed9182SOmar Sandoval 1076a5ed9182SOmar Sandoval path2 = btrfs_alloc_path(); 1077a5ed9182SOmar Sandoval if (!path2) { 1078a5ed9182SOmar Sandoval btrfs_free_path(path); 1079a5ed9182SOmar Sandoval return -ENOMEM; 1080a5ed9182SOmar Sandoval } 1081a5ed9182SOmar Sandoval 108266afee18SNikolay Borisov ret = add_new_free_space_info(trans, block_group, path2); 1083a5ed9182SOmar Sandoval if (ret) 1084a5ed9182SOmar Sandoval goto out; 1085a5ed9182SOmar Sandoval 1086511711afSChris Mason mutex_lock(&block_group->free_space_lock); 1087511711afSChris Mason 1088a5ed9182SOmar Sandoval /* 1089a5ed9182SOmar Sandoval * Iterate through all of the extent and metadata items in this block 1090a5ed9182SOmar Sandoval * group, adding the free space between them and the free space at the 1091a5ed9182SOmar Sandoval * end. Note that EXTENT_ITEM and METADATA_ITEM are less than 1092a5ed9182SOmar Sandoval * BLOCK_GROUP_ITEM, so an extent may precede the block group that it's 1093a5ed9182SOmar Sandoval * contained in. 1094a5ed9182SOmar Sandoval */ 1095b3470b5dSDavid Sterba key.objectid = block_group->start; 1096a5ed9182SOmar Sandoval key.type = BTRFS_EXTENT_ITEM_KEY; 1097a5ed9182SOmar Sandoval key.offset = 0; 1098a5ed9182SOmar Sandoval 109929cbcf40SJosef Bacik extent_root = btrfs_extent_root(trans->fs_info, key.objectid); 1100a5ed9182SOmar Sandoval ret = btrfs_search_slot_for_read(extent_root, &key, path, 1, 0); 1101a5ed9182SOmar Sandoval if (ret < 0) 1102511711afSChris Mason goto out_locked; 1103a5ed9182SOmar Sandoval ASSERT(ret == 0); 1104a5ed9182SOmar Sandoval 1105b3470b5dSDavid Sterba start = block_group->start; 1106b3470b5dSDavid Sterba end = block_group->start + block_group->length; 1107a5ed9182SOmar Sandoval while (1) { 1108a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 1109a5ed9182SOmar Sandoval 1110a5ed9182SOmar Sandoval if (key.type == BTRFS_EXTENT_ITEM_KEY || 1111a5ed9182SOmar Sandoval key.type == BTRFS_METADATA_ITEM_KEY) { 1112a5ed9182SOmar Sandoval if (key.objectid >= end) 1113a5ed9182SOmar Sandoval break; 1114a5ed9182SOmar Sandoval 1115a5ed9182SOmar Sandoval if (start < key.objectid) { 11162d5cffa1SNikolay Borisov ret = __add_to_free_space_tree(trans, 1117a5ed9182SOmar Sandoval block_group, 1118a5ed9182SOmar Sandoval path2, start, 1119a5ed9182SOmar Sandoval key.objectid - 1120a5ed9182SOmar Sandoval start); 1121a5ed9182SOmar Sandoval if (ret) 1122511711afSChris Mason goto out_locked; 1123a5ed9182SOmar Sandoval } 1124a5ed9182SOmar Sandoval start = key.objectid; 1125a5ed9182SOmar Sandoval if (key.type == BTRFS_METADATA_ITEM_KEY) 1126ffa9a9efSNikolay Borisov start += trans->fs_info->nodesize; 1127a5ed9182SOmar Sandoval else 1128a5ed9182SOmar Sandoval start += key.offset; 1129a5ed9182SOmar Sandoval } else if (key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { 1130b3470b5dSDavid Sterba if (key.objectid != block_group->start) 1131a5ed9182SOmar Sandoval break; 1132a5ed9182SOmar Sandoval } 1133a5ed9182SOmar Sandoval 1134a5ed9182SOmar Sandoval ret = btrfs_next_item(extent_root, path); 1135a5ed9182SOmar Sandoval if (ret < 0) 1136511711afSChris Mason goto out_locked; 1137a5ed9182SOmar Sandoval if (ret) 1138a5ed9182SOmar Sandoval break; 1139a5ed9182SOmar Sandoval } 1140a5ed9182SOmar Sandoval if (start < end) { 11412d5cffa1SNikolay Borisov ret = __add_to_free_space_tree(trans, block_group, path2, 11422d5cffa1SNikolay Borisov start, end - start); 1143a5ed9182SOmar Sandoval if (ret) 1144511711afSChris Mason goto out_locked; 1145a5ed9182SOmar Sandoval } 1146a5ed9182SOmar Sandoval 1147a5ed9182SOmar Sandoval ret = 0; 1148511711afSChris Mason out_locked: 1149511711afSChris Mason mutex_unlock(&block_group->free_space_lock); 1150a5ed9182SOmar Sandoval out: 1151a5ed9182SOmar Sandoval btrfs_free_path(path2); 1152a5ed9182SOmar Sandoval btrfs_free_path(path); 1153a5ed9182SOmar Sandoval return ret; 1154a5ed9182SOmar Sandoval } 1155a5ed9182SOmar Sandoval 1156a5ed9182SOmar Sandoval int btrfs_create_free_space_tree(struct btrfs_fs_info *fs_info) 1157a5ed9182SOmar Sandoval { 1158a5ed9182SOmar Sandoval struct btrfs_trans_handle *trans; 1159a5ed9182SOmar Sandoval struct btrfs_root *tree_root = fs_info->tree_root; 1160a5ed9182SOmar Sandoval struct btrfs_root *free_space_root; 116132da5386SDavid Sterba struct btrfs_block_group *block_group; 1162a5ed9182SOmar Sandoval struct rb_node *node; 1163a5ed9182SOmar Sandoval int ret; 1164a5ed9182SOmar Sandoval 1165a5ed9182SOmar Sandoval trans = btrfs_start_transaction(tree_root, 0); 1166a5ed9182SOmar Sandoval if (IS_ERR(trans)) 1167a5ed9182SOmar Sandoval return PTR_ERR(trans); 1168a5ed9182SOmar Sandoval 1169afcdd129SJosef Bacik set_bit(BTRFS_FS_CREATING_FREE_SPACE_TREE, &fs_info->flags); 11702f96e402SJosef Bacik set_bit(BTRFS_FS_FREE_SPACE_TREE_UNTRUSTED, &fs_info->flags); 11719b7a2440SDavid Sterba free_space_root = btrfs_create_tree(trans, 1172a5ed9182SOmar Sandoval BTRFS_FREE_SPACE_TREE_OBJECTID); 1173a5ed9182SOmar Sandoval if (IS_ERR(free_space_root)) { 1174a5ed9182SOmar Sandoval ret = PTR_ERR(free_space_root); 1175a5ed9182SOmar Sandoval goto abort; 1176a5ed9182SOmar Sandoval } 1177abed4aaaSJosef Bacik ret = btrfs_global_root_insert(free_space_root); 1178abed4aaaSJosef Bacik if (ret) { 1179abed4aaaSJosef Bacik btrfs_put_root(free_space_root); 1180abed4aaaSJosef Bacik goto abort; 1181abed4aaaSJosef Bacik } 1182a5ed9182SOmar Sandoval 118308dddb29SFilipe Manana node = rb_first_cached(&fs_info->block_group_cache_tree); 1184a5ed9182SOmar Sandoval while (node) { 118532da5386SDavid Sterba block_group = rb_entry(node, struct btrfs_block_group, 1186a5ed9182SOmar Sandoval cache_node); 1187ffa9a9efSNikolay Borisov ret = populate_free_space_tree(trans, block_group); 1188a5ed9182SOmar Sandoval if (ret) 1189a5ed9182SOmar Sandoval goto abort; 1190a5ed9182SOmar Sandoval node = rb_next(node); 1191a5ed9182SOmar Sandoval } 1192a5ed9182SOmar Sandoval 1193a5ed9182SOmar Sandoval btrfs_set_fs_compat_ro(fs_info, FREE_SPACE_TREE); 11946675df31SOmar Sandoval btrfs_set_fs_compat_ro(fs_info, FREE_SPACE_TREE_VALID); 1195afcdd129SJosef Bacik clear_bit(BTRFS_FS_CREATING_FREE_SPACE_TREE, &fs_info->flags); 11962f96e402SJosef Bacik ret = btrfs_commit_transaction(trans); 1197a5ed9182SOmar Sandoval 11982f96e402SJosef Bacik /* 11992f96e402SJosef Bacik * Now that we've committed the transaction any reading of our commit 12002f96e402SJosef Bacik * root will be safe, so we can cache from the free space tree now. 12012f96e402SJosef Bacik */ 12022f96e402SJosef Bacik clear_bit(BTRFS_FS_FREE_SPACE_TREE_UNTRUSTED, &fs_info->flags); 12032f96e402SJosef Bacik return ret; 1204a5ed9182SOmar Sandoval 1205a5ed9182SOmar Sandoval abort: 1206afcdd129SJosef Bacik clear_bit(BTRFS_FS_CREATING_FREE_SPACE_TREE, &fs_info->flags); 12072f96e402SJosef Bacik clear_bit(BTRFS_FS_FREE_SPACE_TREE_UNTRUSTED, &fs_info->flags); 120866642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 12093a45bb20SJeff Mahoney btrfs_end_transaction(trans); 1210a5ed9182SOmar Sandoval return ret; 1211a5ed9182SOmar Sandoval } 1212a5ed9182SOmar Sandoval 1213a5ed9182SOmar Sandoval static int clear_free_space_tree(struct btrfs_trans_handle *trans, 1214a5ed9182SOmar Sandoval struct btrfs_root *root) 1215a5ed9182SOmar Sandoval { 1216a5ed9182SOmar Sandoval struct btrfs_path *path; 1217a5ed9182SOmar Sandoval struct btrfs_key key; 1218a5ed9182SOmar Sandoval int nr; 1219a5ed9182SOmar Sandoval int ret; 1220a5ed9182SOmar Sandoval 1221a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1222a5ed9182SOmar Sandoval if (!path) 1223a5ed9182SOmar Sandoval return -ENOMEM; 1224a5ed9182SOmar Sandoval 1225a5ed9182SOmar Sandoval key.objectid = 0; 1226a5ed9182SOmar Sandoval key.type = 0; 1227a5ed9182SOmar Sandoval key.offset = 0; 1228a5ed9182SOmar Sandoval 1229a5ed9182SOmar Sandoval while (1) { 1230a5ed9182SOmar Sandoval ret = btrfs_search_slot(trans, root, &key, path, -1, 1); 1231a5ed9182SOmar Sandoval if (ret < 0) 1232a5ed9182SOmar Sandoval goto out; 1233a5ed9182SOmar Sandoval 1234a5ed9182SOmar Sandoval nr = btrfs_header_nritems(path->nodes[0]); 1235a5ed9182SOmar Sandoval if (!nr) 1236a5ed9182SOmar Sandoval break; 1237a5ed9182SOmar Sandoval 1238a5ed9182SOmar Sandoval path->slots[0] = 0; 1239a5ed9182SOmar Sandoval ret = btrfs_del_items(trans, root, path, 0, nr); 1240a5ed9182SOmar Sandoval if (ret) 1241a5ed9182SOmar Sandoval goto out; 1242a5ed9182SOmar Sandoval 1243a5ed9182SOmar Sandoval btrfs_release_path(path); 1244a5ed9182SOmar Sandoval } 1245a5ed9182SOmar Sandoval 1246a5ed9182SOmar Sandoval ret = 0; 1247a5ed9182SOmar Sandoval out: 1248a5ed9182SOmar Sandoval btrfs_free_path(path); 1249a5ed9182SOmar Sandoval return ret; 1250a5ed9182SOmar Sandoval } 1251a5ed9182SOmar Sandoval 1252a5ed9182SOmar Sandoval int btrfs_clear_free_space_tree(struct btrfs_fs_info *fs_info) 1253a5ed9182SOmar Sandoval { 1254a5ed9182SOmar Sandoval struct btrfs_trans_handle *trans; 1255a5ed9182SOmar Sandoval struct btrfs_root *tree_root = fs_info->tree_root; 1256abed4aaaSJosef Bacik struct btrfs_key key = { 1257abed4aaaSJosef Bacik .objectid = BTRFS_FREE_SPACE_TREE_OBJECTID, 1258abed4aaaSJosef Bacik .type = BTRFS_ROOT_ITEM_KEY, 1259abed4aaaSJosef Bacik .offset = 0, 1260abed4aaaSJosef Bacik }; 1261abed4aaaSJosef Bacik struct btrfs_root *free_space_root = btrfs_global_root(fs_info, &key); 1262a5ed9182SOmar Sandoval int ret; 1263a5ed9182SOmar Sandoval 1264a5ed9182SOmar Sandoval trans = btrfs_start_transaction(tree_root, 0); 1265a5ed9182SOmar Sandoval if (IS_ERR(trans)) 1266a5ed9182SOmar Sandoval return PTR_ERR(trans); 1267a5ed9182SOmar Sandoval 1268a5ed9182SOmar Sandoval btrfs_clear_fs_compat_ro(fs_info, FREE_SPACE_TREE); 12696675df31SOmar Sandoval btrfs_clear_fs_compat_ro(fs_info, FREE_SPACE_TREE_VALID); 1270a5ed9182SOmar Sandoval 1271a5ed9182SOmar Sandoval ret = clear_free_space_tree(trans, free_space_root); 1272a5ed9182SOmar Sandoval if (ret) 1273a5ed9182SOmar Sandoval goto abort; 1274a5ed9182SOmar Sandoval 1275ab9ce7d4SLu Fengqi ret = btrfs_del_root(trans, &free_space_root->root_key); 1276a5ed9182SOmar Sandoval if (ret) 1277a5ed9182SOmar Sandoval goto abort; 1278a5ed9182SOmar Sandoval 1279abed4aaaSJosef Bacik btrfs_global_root_delete(free_space_root); 1280a5ed9182SOmar Sandoval list_del(&free_space_root->dirty_list); 1281a5ed9182SOmar Sandoval 1282a5ed9182SOmar Sandoval btrfs_tree_lock(free_space_root->node); 12836a884d7dSDavid Sterba btrfs_clean_tree_block(free_space_root->node); 1284a5ed9182SOmar Sandoval btrfs_tree_unlock(free_space_root->node); 12857a163608SFilipe Manana btrfs_free_tree_block(trans, btrfs_root_id(free_space_root), 12867a163608SFilipe Manana free_space_root->node, 0, 1); 1287a5ed9182SOmar Sandoval 128800246528SJosef Bacik btrfs_put_root(free_space_root); 1289a5ed9182SOmar Sandoval 12900bef7109SSahil Kang return btrfs_commit_transaction(trans); 1291a5ed9182SOmar Sandoval 1292a5ed9182SOmar Sandoval abort: 129366642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 12943a45bb20SJeff Mahoney btrfs_end_transaction(trans); 1295a5ed9182SOmar Sandoval return ret; 1296a5ed9182SOmar Sandoval } 1297a5ed9182SOmar Sandoval 1298a5ed9182SOmar Sandoval static int __add_block_group_free_space(struct btrfs_trans_handle *trans, 129932da5386SDavid Sterba struct btrfs_block_group *block_group, 1300a5ed9182SOmar Sandoval struct btrfs_path *path) 1301a5ed9182SOmar Sandoval { 1302a5ed9182SOmar Sandoval int ret; 1303a5ed9182SOmar Sandoval 1304a5ed9182SOmar Sandoval block_group->needs_free_space = 0; 1305a5ed9182SOmar Sandoval 130666afee18SNikolay Borisov ret = add_new_free_space_info(trans, block_group, path); 1307a5ed9182SOmar Sandoval if (ret) 1308a5ed9182SOmar Sandoval return ret; 1309a5ed9182SOmar Sandoval 13102d5cffa1SNikolay Borisov return __add_to_free_space_tree(trans, block_group, path, 1311b3470b5dSDavid Sterba block_group->start, 1312b3470b5dSDavid Sterba block_group->length); 1313a5ed9182SOmar Sandoval } 1314a5ed9182SOmar Sandoval 1315a5ed9182SOmar Sandoval int add_block_group_free_space(struct btrfs_trans_handle *trans, 131632da5386SDavid Sterba struct btrfs_block_group *block_group) 1317a5ed9182SOmar Sandoval { 1318e4e0711cSNikolay Borisov struct btrfs_fs_info *fs_info = trans->fs_info; 1319a5ed9182SOmar Sandoval struct btrfs_path *path = NULL; 1320a5ed9182SOmar Sandoval int ret = 0; 1321a5ed9182SOmar Sandoval 1322a5ed9182SOmar Sandoval if (!btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) 1323a5ed9182SOmar Sandoval return 0; 1324a5ed9182SOmar Sandoval 1325a5ed9182SOmar Sandoval mutex_lock(&block_group->free_space_lock); 1326a5ed9182SOmar Sandoval if (!block_group->needs_free_space) 1327a5ed9182SOmar Sandoval goto out; 1328a5ed9182SOmar Sandoval 1329a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1330a5ed9182SOmar Sandoval if (!path) { 1331a5ed9182SOmar Sandoval ret = -ENOMEM; 1332a5ed9182SOmar Sandoval goto out; 1333a5ed9182SOmar Sandoval } 1334a5ed9182SOmar Sandoval 13359a7e0f92SNikolay Borisov ret = __add_block_group_free_space(trans, block_group, path); 1336a5ed9182SOmar Sandoval 1337a5ed9182SOmar Sandoval out: 1338a5ed9182SOmar Sandoval btrfs_free_path(path); 1339a5ed9182SOmar Sandoval mutex_unlock(&block_group->free_space_lock); 1340a5ed9182SOmar Sandoval if (ret) 134166642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 1342a5ed9182SOmar Sandoval return ret; 1343a5ed9182SOmar Sandoval } 1344a5ed9182SOmar Sandoval 1345a5ed9182SOmar Sandoval int remove_block_group_free_space(struct btrfs_trans_handle *trans, 134632da5386SDavid Sterba struct btrfs_block_group *block_group) 1347a5ed9182SOmar Sandoval { 13487939dd9fSJosef Bacik struct btrfs_root *root = btrfs_free_space_root(block_group); 1349a5ed9182SOmar Sandoval struct btrfs_path *path; 1350a5ed9182SOmar Sandoval struct btrfs_key key, found_key; 1351a5ed9182SOmar Sandoval struct extent_buffer *leaf; 1352a5ed9182SOmar Sandoval u64 start, end; 1353a5ed9182SOmar Sandoval int done = 0, nr; 1354a5ed9182SOmar Sandoval int ret; 1355a5ed9182SOmar Sandoval 1356f3f72779SNikolay Borisov if (!btrfs_fs_compat_ro(trans->fs_info, FREE_SPACE_TREE)) 1357a5ed9182SOmar Sandoval return 0; 1358a5ed9182SOmar Sandoval 1359a5ed9182SOmar Sandoval if (block_group->needs_free_space) { 1360a5ed9182SOmar Sandoval /* We never added this block group to the free space tree. */ 1361a5ed9182SOmar Sandoval return 0; 1362a5ed9182SOmar Sandoval } 1363a5ed9182SOmar Sandoval 1364a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1365a5ed9182SOmar Sandoval if (!path) { 1366a5ed9182SOmar Sandoval ret = -ENOMEM; 1367a5ed9182SOmar Sandoval goto out; 1368a5ed9182SOmar Sandoval } 1369a5ed9182SOmar Sandoval 1370b3470b5dSDavid Sterba start = block_group->start; 1371b3470b5dSDavid Sterba end = block_group->start + block_group->length; 1372a5ed9182SOmar Sandoval 1373a5ed9182SOmar Sandoval key.objectid = end - 1; 1374a5ed9182SOmar Sandoval key.type = (u8)-1; 1375a5ed9182SOmar Sandoval key.offset = (u64)-1; 1376a5ed9182SOmar Sandoval 1377a5ed9182SOmar Sandoval while (!done) { 1378a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 1379a5ed9182SOmar Sandoval if (ret) 1380a5ed9182SOmar Sandoval goto out; 1381a5ed9182SOmar Sandoval 1382a5ed9182SOmar Sandoval leaf = path->nodes[0]; 1383a5ed9182SOmar Sandoval nr = 0; 1384a5ed9182SOmar Sandoval path->slots[0]++; 1385a5ed9182SOmar Sandoval while (path->slots[0] > 0) { 1386a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0] - 1); 1387a5ed9182SOmar Sandoval 1388a5ed9182SOmar Sandoval if (found_key.type == BTRFS_FREE_SPACE_INFO_KEY) { 1389b3470b5dSDavid Sterba ASSERT(found_key.objectid == block_group->start); 1390b3470b5dSDavid Sterba ASSERT(found_key.offset == block_group->length); 1391a5ed9182SOmar Sandoval done = 1; 1392a5ed9182SOmar Sandoval nr++; 1393a5ed9182SOmar Sandoval path->slots[0]--; 1394a5ed9182SOmar Sandoval break; 1395a5ed9182SOmar Sandoval } else if (found_key.type == BTRFS_FREE_SPACE_EXTENT_KEY || 1396a5ed9182SOmar Sandoval found_key.type == BTRFS_FREE_SPACE_BITMAP_KEY) { 1397a5ed9182SOmar Sandoval ASSERT(found_key.objectid >= start); 1398a5ed9182SOmar Sandoval ASSERT(found_key.objectid < end); 1399a5ed9182SOmar Sandoval ASSERT(found_key.objectid + found_key.offset <= end); 1400a5ed9182SOmar Sandoval nr++; 1401a5ed9182SOmar Sandoval path->slots[0]--; 1402a5ed9182SOmar Sandoval } else { 1403a5ed9182SOmar Sandoval ASSERT(0); 1404a5ed9182SOmar Sandoval } 1405a5ed9182SOmar Sandoval } 1406a5ed9182SOmar Sandoval 1407a5ed9182SOmar Sandoval ret = btrfs_del_items(trans, root, path, path->slots[0], nr); 1408a5ed9182SOmar Sandoval if (ret) 1409a5ed9182SOmar Sandoval goto out; 1410a5ed9182SOmar Sandoval btrfs_release_path(path); 1411a5ed9182SOmar Sandoval } 1412a5ed9182SOmar Sandoval 1413a5ed9182SOmar Sandoval ret = 0; 1414a5ed9182SOmar Sandoval out: 1415a5ed9182SOmar Sandoval btrfs_free_path(path); 1416a5ed9182SOmar Sandoval if (ret) 141766642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 1418a5ed9182SOmar Sandoval return ret; 1419a5ed9182SOmar Sandoval } 1420a5ed9182SOmar Sandoval 1421a5ed9182SOmar Sandoval static int load_free_space_bitmaps(struct btrfs_caching_control *caching_ctl, 1422a5ed9182SOmar Sandoval struct btrfs_path *path, 1423a5ed9182SOmar Sandoval u32 expected_extent_count) 1424a5ed9182SOmar Sandoval { 142532da5386SDavid Sterba struct btrfs_block_group *block_group; 1426a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info; 1427a5ed9182SOmar Sandoval struct btrfs_root *root; 1428a5ed9182SOmar Sandoval struct btrfs_key key; 1429a5ed9182SOmar Sandoval int prev_bit = 0, bit; 1430a5ed9182SOmar Sandoval /* Initialize to silence GCC. */ 1431a5ed9182SOmar Sandoval u64 extent_start = 0; 1432a5ed9182SOmar Sandoval u64 end, offset; 1433a5ed9182SOmar Sandoval u64 total_found = 0; 1434a5ed9182SOmar Sandoval u32 extent_count = 0; 1435a5ed9182SOmar Sandoval int ret; 1436a5ed9182SOmar Sandoval 1437a5ed9182SOmar Sandoval block_group = caching_ctl->block_group; 1438a5ed9182SOmar Sandoval fs_info = block_group->fs_info; 14397939dd9fSJosef Bacik root = btrfs_free_space_root(block_group); 1440a5ed9182SOmar Sandoval 1441b3470b5dSDavid Sterba end = block_group->start + block_group->length; 1442a5ed9182SOmar Sandoval 1443a5ed9182SOmar Sandoval while (1) { 1444a5ed9182SOmar Sandoval ret = btrfs_next_item(root, path); 1445a5ed9182SOmar Sandoval if (ret < 0) 1446a5ed9182SOmar Sandoval goto out; 1447a5ed9182SOmar Sandoval if (ret) 1448a5ed9182SOmar Sandoval break; 1449a5ed9182SOmar Sandoval 1450a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 1451a5ed9182SOmar Sandoval 1452a5ed9182SOmar Sandoval if (key.type == BTRFS_FREE_SPACE_INFO_KEY) 1453a5ed9182SOmar Sandoval break; 1454a5ed9182SOmar Sandoval 1455a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_BITMAP_KEY); 1456a5ed9182SOmar Sandoval ASSERT(key.objectid < end && key.objectid + key.offset <= end); 1457a5ed9182SOmar Sandoval 1458a5ed9182SOmar Sandoval offset = key.objectid; 1459a5ed9182SOmar Sandoval while (offset < key.objectid + key.offset) { 1460a5ed9182SOmar Sandoval bit = free_space_test_bit(block_group, path, offset); 1461a5ed9182SOmar Sandoval if (prev_bit == 0 && bit == 1) { 1462a5ed9182SOmar Sandoval extent_start = offset; 1463a5ed9182SOmar Sandoval } else if (prev_bit == 1 && bit == 0) { 1464a5ed9182SOmar Sandoval total_found += add_new_free_space(block_group, 1465a5ed9182SOmar Sandoval extent_start, 1466a5ed9182SOmar Sandoval offset); 1467a5ed9182SOmar Sandoval if (total_found > CACHING_CTL_WAKE_UP) { 1468a5ed9182SOmar Sandoval total_found = 0; 1469a5ed9182SOmar Sandoval wake_up(&caching_ctl->wait); 1470a5ed9182SOmar Sandoval } 1471a5ed9182SOmar Sandoval extent_count++; 1472a5ed9182SOmar Sandoval } 1473a5ed9182SOmar Sandoval prev_bit = bit; 14740b246afaSJeff Mahoney offset += fs_info->sectorsize; 1475a5ed9182SOmar Sandoval } 1476a5ed9182SOmar Sandoval } 1477a5ed9182SOmar Sandoval if (prev_bit == 1) { 14784457c1c7SNikolay Borisov total_found += add_new_free_space(block_group, extent_start, 14794457c1c7SNikolay Borisov end); 1480a5ed9182SOmar Sandoval extent_count++; 1481a5ed9182SOmar Sandoval } 1482a5ed9182SOmar Sandoval 1483a5ed9182SOmar Sandoval if (extent_count != expected_extent_count) { 14845d163e0eSJeff Mahoney btrfs_err(fs_info, 14855d163e0eSJeff Mahoney "incorrect extent count for %llu; counted %u, expected %u", 1486b3470b5dSDavid Sterba block_group->start, extent_count, 1487a5ed9182SOmar Sandoval expected_extent_count); 1488a5ed9182SOmar Sandoval ASSERT(0); 1489a5ed9182SOmar Sandoval ret = -EIO; 1490a5ed9182SOmar Sandoval goto out; 1491a5ed9182SOmar Sandoval } 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 15324457c1c7SNikolay Borisov total_found += add_new_free_space(block_group, key.objectid, 1533a5ed9182SOmar Sandoval key.objectid + key.offset); 1534a5ed9182SOmar Sandoval if (total_found > CACHING_CTL_WAKE_UP) { 1535a5ed9182SOmar Sandoval total_found = 0; 1536a5ed9182SOmar Sandoval wake_up(&caching_ctl->wait); 1537a5ed9182SOmar Sandoval } 1538a5ed9182SOmar Sandoval extent_count++; 1539a5ed9182SOmar Sandoval } 1540a5ed9182SOmar Sandoval 1541a5ed9182SOmar Sandoval if (extent_count != expected_extent_count) { 15425d163e0eSJeff Mahoney btrfs_err(fs_info, 15435d163e0eSJeff Mahoney "incorrect extent count for %llu; counted %u, expected %u", 1544b3470b5dSDavid Sterba block_group->start, extent_count, 1545a5ed9182SOmar Sandoval expected_extent_count); 1546a5ed9182SOmar Sandoval ASSERT(0); 1547a5ed9182SOmar Sandoval ret = -EIO; 1548a5ed9182SOmar Sandoval goto out; 1549a5ed9182SOmar Sandoval } 1550a5ed9182SOmar Sandoval 1551a5ed9182SOmar Sandoval ret = 0; 1552a5ed9182SOmar Sandoval out: 1553a5ed9182SOmar Sandoval return ret; 1554a5ed9182SOmar Sandoval } 1555a5ed9182SOmar Sandoval 1556a5ed9182SOmar Sandoval int load_free_space_tree(struct btrfs_caching_control *caching_ctl) 1557a5ed9182SOmar Sandoval { 155832da5386SDavid Sterba struct btrfs_block_group *block_group; 1559a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 1560a5ed9182SOmar Sandoval struct btrfs_path *path; 1561a5ed9182SOmar Sandoval u32 extent_count, flags; 1562a5ed9182SOmar Sandoval int ret; 1563a5ed9182SOmar Sandoval 1564a5ed9182SOmar Sandoval block_group = caching_ctl->block_group; 1565a5ed9182SOmar Sandoval 1566a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1567a5ed9182SOmar Sandoval if (!path) 1568a5ed9182SOmar Sandoval return -ENOMEM; 1569a5ed9182SOmar Sandoval 1570a5ed9182SOmar Sandoval /* 1571a5ed9182SOmar Sandoval * Just like caching_thread() doesn't want to deadlock on the extent 1572a5ed9182SOmar Sandoval * tree, we don't want to deadlock on the free space tree. 1573a5ed9182SOmar Sandoval */ 1574a5ed9182SOmar Sandoval path->skip_locking = 1; 1575a5ed9182SOmar Sandoval path->search_commit_root = 1; 15767ce311d5SGu JinXiang path->reada = READA_FORWARD; 1577a5ed9182SOmar Sandoval 15782ccf545eSDavid Sterba info = search_free_space_info(NULL, block_group, path, 0); 1579a5ed9182SOmar Sandoval if (IS_ERR(info)) { 1580a5ed9182SOmar Sandoval ret = PTR_ERR(info); 1581a5ed9182SOmar Sandoval goto out; 1582a5ed9182SOmar Sandoval } 1583a5ed9182SOmar Sandoval extent_count = btrfs_free_space_extent_count(path->nodes[0], info); 1584a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(path->nodes[0], info); 1585a5ed9182SOmar Sandoval 1586a5ed9182SOmar Sandoval /* 1587a5ed9182SOmar Sandoval * We left path pointing to the free space info item, so now 1588a5ed9182SOmar Sandoval * load_free_space_foo can just iterate through the free space tree from 1589a5ed9182SOmar Sandoval * there. 1590a5ed9182SOmar Sandoval */ 1591a5ed9182SOmar Sandoval if (flags & BTRFS_FREE_SPACE_USING_BITMAPS) 1592a5ed9182SOmar Sandoval ret = load_free_space_bitmaps(caching_ctl, path, extent_count); 1593a5ed9182SOmar Sandoval else 1594a5ed9182SOmar Sandoval ret = load_free_space_extents(caching_ctl, path, extent_count); 1595a5ed9182SOmar Sandoval 1596a5ed9182SOmar Sandoval out: 1597a5ed9182SOmar Sandoval btrfs_free_path(path); 1598a5ed9182SOmar Sandoval return ret; 1599a5ed9182SOmar Sandoval } 1600