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" 14*c7f13d42SJosef Bacik #include "fs.h" 15a5ed9182SOmar Sandoval 16a5ed9182SOmar Sandoval static int __add_block_group_free_space(struct btrfs_trans_handle *trans, 1732da5386SDavid Sterba struct btrfs_block_group *block_group, 18a5ed9182SOmar Sandoval struct btrfs_path *path); 19a5ed9182SOmar Sandoval 207939dd9fSJosef Bacik static struct btrfs_root *btrfs_free_space_root( 217939dd9fSJosef Bacik struct btrfs_block_group *block_group) 227939dd9fSJosef Bacik { 23abed4aaaSJosef Bacik struct btrfs_key key = { 24abed4aaaSJosef Bacik .objectid = BTRFS_FREE_SPACE_TREE_OBJECTID, 25abed4aaaSJosef Bacik .type = BTRFS_ROOT_ITEM_KEY, 26abed4aaaSJosef Bacik .offset = 0, 27abed4aaaSJosef Bacik }; 28abed4aaaSJosef Bacik 29f7238e50SJosef Bacik if (btrfs_fs_incompat(block_group->fs_info, EXTENT_TREE_V2)) 30f7238e50SJosef Bacik key.offset = block_group->global_root_id; 31abed4aaaSJosef Bacik return btrfs_global_root(block_group->fs_info, &key); 327939dd9fSJosef Bacik } 337939dd9fSJosef Bacik 3432da5386SDavid Sterba void set_free_space_tree_thresholds(struct btrfs_block_group *cache) 35a5ed9182SOmar Sandoval { 36a5ed9182SOmar Sandoval u32 bitmap_range; 37a5ed9182SOmar Sandoval size_t bitmap_size; 38a5ed9182SOmar Sandoval u64 num_bitmaps, total_bitmap_size; 39a5ed9182SOmar Sandoval 40e3e39c72SMarcos Paulo de Souza if (WARN_ON(cache->length == 0)) 41e3e39c72SMarcos Paulo de Souza btrfs_warn(cache->fs_info, "block group %llu length is zero", 42e3e39c72SMarcos Paulo de Souza cache->start); 43e3e39c72SMarcos Paulo de Souza 44a5ed9182SOmar Sandoval /* 45a5ed9182SOmar Sandoval * We convert to bitmaps when the disk space required for using extents 46a5ed9182SOmar Sandoval * exceeds that required for using bitmaps. 47a5ed9182SOmar Sandoval */ 48da17066cSJeff Mahoney bitmap_range = cache->fs_info->sectorsize * BTRFS_FREE_SPACE_BITMAP_BITS; 49b3470b5dSDavid Sterba num_bitmaps = div_u64(cache->length + bitmap_range - 1, bitmap_range); 50a5ed9182SOmar Sandoval bitmap_size = sizeof(struct btrfs_item) + BTRFS_FREE_SPACE_BITMAP_SIZE; 51a5ed9182SOmar Sandoval total_bitmap_size = num_bitmaps * bitmap_size; 52a5ed9182SOmar Sandoval cache->bitmap_high_thresh = div_u64(total_bitmap_size, 53a5ed9182SOmar Sandoval sizeof(struct btrfs_item)); 54a5ed9182SOmar Sandoval 55a5ed9182SOmar Sandoval /* 56a5ed9182SOmar Sandoval * We allow for a small buffer between the high threshold and low 57a5ed9182SOmar Sandoval * threshold to avoid thrashing back and forth between the two formats. 58a5ed9182SOmar Sandoval */ 59a5ed9182SOmar Sandoval if (cache->bitmap_high_thresh > 100) 60a5ed9182SOmar Sandoval cache->bitmap_low_thresh = cache->bitmap_high_thresh - 100; 61a5ed9182SOmar Sandoval else 62a5ed9182SOmar Sandoval cache->bitmap_low_thresh = 0; 63a5ed9182SOmar Sandoval } 64a5ed9182SOmar Sandoval 65a5ed9182SOmar Sandoval static int add_new_free_space_info(struct btrfs_trans_handle *trans, 6632da5386SDavid Sterba struct btrfs_block_group *block_group, 67a5ed9182SOmar Sandoval struct btrfs_path *path) 68a5ed9182SOmar Sandoval { 697939dd9fSJosef Bacik struct btrfs_root *root = btrfs_free_space_root(block_group); 70a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 71a5ed9182SOmar Sandoval struct btrfs_key key; 72a5ed9182SOmar Sandoval struct extent_buffer *leaf; 73a5ed9182SOmar Sandoval int ret; 74a5ed9182SOmar Sandoval 75b3470b5dSDavid Sterba key.objectid = block_group->start; 76a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_INFO_KEY; 77b3470b5dSDavid Sterba key.offset = block_group->length; 78a5ed9182SOmar Sandoval 79a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(*info)); 80a5ed9182SOmar Sandoval if (ret) 81a5ed9182SOmar Sandoval goto out; 82a5ed9182SOmar Sandoval 83a5ed9182SOmar Sandoval leaf = path->nodes[0]; 84a5ed9182SOmar Sandoval info = btrfs_item_ptr(leaf, path->slots[0], 85a5ed9182SOmar Sandoval struct btrfs_free_space_info); 86a5ed9182SOmar Sandoval btrfs_set_free_space_extent_count(leaf, info, 0); 87a5ed9182SOmar Sandoval btrfs_set_free_space_flags(leaf, info, 0); 88a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 89a5ed9182SOmar Sandoval 90a5ed9182SOmar Sandoval ret = 0; 91a5ed9182SOmar Sandoval out: 92a5ed9182SOmar Sandoval btrfs_release_path(path); 93a5ed9182SOmar Sandoval return ret; 94a5ed9182SOmar Sandoval } 95a5ed9182SOmar Sandoval 96ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 97ce9f967fSJohannes Thumshirn struct btrfs_free_space_info *search_free_space_info( 982ccf545eSDavid Sterba struct btrfs_trans_handle *trans, 9932da5386SDavid Sterba struct btrfs_block_group *block_group, 100a5ed9182SOmar Sandoval struct btrfs_path *path, int cow) 101a5ed9182SOmar Sandoval { 1022ccf545eSDavid Sterba struct btrfs_fs_info *fs_info = block_group->fs_info; 1037939dd9fSJosef Bacik struct btrfs_root *root = btrfs_free_space_root(block_group); 104a5ed9182SOmar Sandoval struct btrfs_key key; 105a5ed9182SOmar Sandoval int ret; 106a5ed9182SOmar Sandoval 107b3470b5dSDavid Sterba key.objectid = block_group->start; 108a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_INFO_KEY; 109b3470b5dSDavid Sterba key.offset = block_group->length; 110a5ed9182SOmar Sandoval 111a5ed9182SOmar Sandoval ret = btrfs_search_slot(trans, root, &key, path, 0, cow); 112a5ed9182SOmar Sandoval if (ret < 0) 113a5ed9182SOmar Sandoval return ERR_PTR(ret); 114a5ed9182SOmar Sandoval if (ret != 0) { 115ab8d0fc4SJeff Mahoney btrfs_warn(fs_info, "missing free space info for %llu", 116b3470b5dSDavid Sterba block_group->start); 117a5ed9182SOmar Sandoval ASSERT(0); 118a5ed9182SOmar Sandoval return ERR_PTR(-ENOENT); 119a5ed9182SOmar Sandoval } 120a5ed9182SOmar Sandoval 121a5ed9182SOmar Sandoval return btrfs_item_ptr(path->nodes[0], path->slots[0], 122a5ed9182SOmar Sandoval struct btrfs_free_space_info); 123a5ed9182SOmar Sandoval } 124a5ed9182SOmar Sandoval 125a5ed9182SOmar Sandoval /* 126a5ed9182SOmar Sandoval * btrfs_search_slot() but we're looking for the greatest key less than the 127a5ed9182SOmar Sandoval * passed key. 128a5ed9182SOmar Sandoval */ 129a5ed9182SOmar Sandoval static int btrfs_search_prev_slot(struct btrfs_trans_handle *trans, 130a5ed9182SOmar Sandoval struct btrfs_root *root, 131a5ed9182SOmar Sandoval struct btrfs_key *key, struct btrfs_path *p, 132a5ed9182SOmar Sandoval int ins_len, int cow) 133a5ed9182SOmar Sandoval { 134a5ed9182SOmar Sandoval int ret; 135a5ed9182SOmar Sandoval 136a5ed9182SOmar Sandoval ret = btrfs_search_slot(trans, root, key, p, ins_len, cow); 137a5ed9182SOmar Sandoval if (ret < 0) 138a5ed9182SOmar Sandoval return ret; 139a5ed9182SOmar Sandoval 140a5ed9182SOmar Sandoval if (ret == 0) { 141a5ed9182SOmar Sandoval ASSERT(0); 142a5ed9182SOmar Sandoval return -EIO; 143a5ed9182SOmar Sandoval } 144a5ed9182SOmar Sandoval 145a5ed9182SOmar Sandoval if (p->slots[0] == 0) { 146a5ed9182SOmar Sandoval ASSERT(0); 147a5ed9182SOmar Sandoval return -EIO; 148a5ed9182SOmar Sandoval } 149a5ed9182SOmar Sandoval p->slots[0]--; 150a5ed9182SOmar Sandoval 151a5ed9182SOmar Sandoval return 0; 152a5ed9182SOmar Sandoval } 153a5ed9182SOmar Sandoval 154098e6308SDavid Sterba static inline u32 free_space_bitmap_size(const struct btrfs_fs_info *fs_info, 155098e6308SDavid Sterba u64 size) 156a5ed9182SOmar Sandoval { 157098e6308SDavid Sterba return DIV_ROUND_UP(size >> fs_info->sectorsize_bits, BITS_PER_BYTE); 158a5ed9182SOmar Sandoval } 159a5ed9182SOmar Sandoval 160a565971fSHoward McLauchlan static unsigned long *alloc_bitmap(u32 bitmap_size) 161a5ed9182SOmar Sandoval { 162a565971fSHoward McLauchlan unsigned long *ret; 16325ff17e8SOmar Sandoval unsigned int nofs_flag; 164a565971fSHoward McLauchlan u32 bitmap_rounded_size = round_up(bitmap_size, sizeof(unsigned long)); 16579b134a2SDavid Sterba 16679b134a2SDavid Sterba /* 16725ff17e8SOmar Sandoval * GFP_NOFS doesn't work with kvmalloc(), but we really can't recurse 16825ff17e8SOmar Sandoval * into the filesystem as the free space bitmap can be modified in the 16925ff17e8SOmar Sandoval * critical section of a transaction commit. 17025ff17e8SOmar Sandoval * 17125ff17e8SOmar Sandoval * TODO: push the memalloc_nofs_{save,restore}() to the caller where we 17225ff17e8SOmar Sandoval * know that recursion is unsafe. 17379b134a2SDavid Sterba */ 17425ff17e8SOmar Sandoval nofs_flag = memalloc_nofs_save(); 175a565971fSHoward McLauchlan ret = kvzalloc(bitmap_rounded_size, GFP_KERNEL); 17625ff17e8SOmar Sandoval memalloc_nofs_restore(nofs_flag); 17725ff17e8SOmar Sandoval return ret; 178a5ed9182SOmar Sandoval } 179a5ed9182SOmar Sandoval 180a565971fSHoward McLauchlan static void le_bitmap_set(unsigned long *map, unsigned int start, int len) 1816faa8f47SHoward McLauchlan { 182a565971fSHoward McLauchlan u8 *p = ((u8 *)map) + BIT_BYTE(start); 1836faa8f47SHoward McLauchlan const unsigned int size = start + len; 1846faa8f47SHoward McLauchlan int bits_to_set = BITS_PER_BYTE - (start % BITS_PER_BYTE); 1856faa8f47SHoward McLauchlan u8 mask_to_set = BITMAP_FIRST_BYTE_MASK(start); 1866faa8f47SHoward McLauchlan 1876faa8f47SHoward McLauchlan while (len - bits_to_set >= 0) { 1886faa8f47SHoward McLauchlan *p |= mask_to_set; 1896faa8f47SHoward McLauchlan len -= bits_to_set; 1906faa8f47SHoward McLauchlan bits_to_set = BITS_PER_BYTE; 1916faa8f47SHoward McLauchlan mask_to_set = ~0; 1926faa8f47SHoward McLauchlan p++; 1936faa8f47SHoward McLauchlan } 1946faa8f47SHoward McLauchlan if (len) { 1956faa8f47SHoward McLauchlan mask_to_set &= BITMAP_LAST_BYTE_MASK(size); 1966faa8f47SHoward McLauchlan *p |= mask_to_set; 1976faa8f47SHoward McLauchlan } 1986faa8f47SHoward McLauchlan } 1996faa8f47SHoward McLauchlan 200ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 201a5ed9182SOmar Sandoval int convert_free_space_to_bitmaps(struct btrfs_trans_handle *trans, 20232da5386SDavid Sterba struct btrfs_block_group *block_group, 203a5ed9182SOmar Sandoval struct btrfs_path *path) 204a5ed9182SOmar Sandoval { 205719fb4deSNikolay Borisov struct btrfs_fs_info *fs_info = trans->fs_info; 2067939dd9fSJosef Bacik struct btrfs_root *root = btrfs_free_space_root(block_group); 207a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 208a5ed9182SOmar Sandoval struct btrfs_key key, found_key; 209a5ed9182SOmar Sandoval struct extent_buffer *leaf; 210a565971fSHoward McLauchlan unsigned long *bitmap; 211a565971fSHoward McLauchlan char *bitmap_cursor; 212a5ed9182SOmar Sandoval u64 start, end; 213a5ed9182SOmar Sandoval u64 bitmap_range, i; 214a5ed9182SOmar Sandoval u32 bitmap_size, flags, expected_extent_count; 215a5ed9182SOmar Sandoval u32 extent_count = 0; 216a5ed9182SOmar Sandoval int done = 0, nr; 217a5ed9182SOmar Sandoval int ret; 218a5ed9182SOmar Sandoval 219098e6308SDavid Sterba bitmap_size = free_space_bitmap_size(fs_info, block_group->length); 220a5ed9182SOmar Sandoval bitmap = alloc_bitmap(bitmap_size); 221a5ed9182SOmar Sandoval if (!bitmap) { 222a5ed9182SOmar Sandoval ret = -ENOMEM; 223a5ed9182SOmar Sandoval goto out; 224a5ed9182SOmar Sandoval } 225a5ed9182SOmar Sandoval 226b3470b5dSDavid Sterba start = block_group->start; 227b3470b5dSDavid Sterba end = block_group->start + block_group->length; 228a5ed9182SOmar Sandoval 229a5ed9182SOmar Sandoval key.objectid = end - 1; 230a5ed9182SOmar Sandoval key.type = (u8)-1; 231a5ed9182SOmar Sandoval key.offset = (u64)-1; 232a5ed9182SOmar Sandoval 233a5ed9182SOmar Sandoval while (!done) { 234a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 235a5ed9182SOmar Sandoval if (ret) 236a5ed9182SOmar Sandoval goto out; 237a5ed9182SOmar Sandoval 238a5ed9182SOmar Sandoval leaf = path->nodes[0]; 239a5ed9182SOmar Sandoval nr = 0; 240a5ed9182SOmar Sandoval path->slots[0]++; 241a5ed9182SOmar Sandoval while (path->slots[0] > 0) { 242a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0] - 1); 243a5ed9182SOmar Sandoval 244a5ed9182SOmar Sandoval if (found_key.type == BTRFS_FREE_SPACE_INFO_KEY) { 245b3470b5dSDavid Sterba ASSERT(found_key.objectid == block_group->start); 246b3470b5dSDavid Sterba ASSERT(found_key.offset == block_group->length); 247a5ed9182SOmar Sandoval done = 1; 248a5ed9182SOmar Sandoval break; 249a5ed9182SOmar Sandoval } else if (found_key.type == BTRFS_FREE_SPACE_EXTENT_KEY) { 250a5ed9182SOmar Sandoval u64 first, last; 251a5ed9182SOmar Sandoval 252a5ed9182SOmar Sandoval ASSERT(found_key.objectid >= start); 253a5ed9182SOmar Sandoval ASSERT(found_key.objectid < end); 254a5ed9182SOmar Sandoval ASSERT(found_key.objectid + found_key.offset <= end); 255a5ed9182SOmar Sandoval 256a5ed9182SOmar Sandoval first = div_u64(found_key.objectid - start, 2570b246afaSJeff Mahoney fs_info->sectorsize); 258a5ed9182SOmar Sandoval last = div_u64(found_key.objectid + found_key.offset - start, 2590b246afaSJeff Mahoney fs_info->sectorsize); 2602fe1d551SOmar Sandoval le_bitmap_set(bitmap, first, last - first); 261a5ed9182SOmar Sandoval 262a5ed9182SOmar Sandoval extent_count++; 263a5ed9182SOmar Sandoval nr++; 264a5ed9182SOmar Sandoval path->slots[0]--; 265a5ed9182SOmar Sandoval } else { 266a5ed9182SOmar Sandoval ASSERT(0); 267a5ed9182SOmar Sandoval } 268a5ed9182SOmar Sandoval } 269a5ed9182SOmar Sandoval 270a5ed9182SOmar Sandoval ret = btrfs_del_items(trans, root, path, path->slots[0], nr); 271a5ed9182SOmar Sandoval if (ret) 272a5ed9182SOmar Sandoval goto out; 273a5ed9182SOmar Sandoval btrfs_release_path(path); 274a5ed9182SOmar Sandoval } 275a5ed9182SOmar Sandoval 2762ccf545eSDavid Sterba info = search_free_space_info(trans, block_group, path, 1); 277a5ed9182SOmar Sandoval if (IS_ERR(info)) { 278a5ed9182SOmar Sandoval ret = PTR_ERR(info); 279a5ed9182SOmar Sandoval goto out; 280a5ed9182SOmar Sandoval } 281a5ed9182SOmar Sandoval leaf = path->nodes[0]; 282a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(leaf, info); 283a5ed9182SOmar Sandoval flags |= BTRFS_FREE_SPACE_USING_BITMAPS; 284a5ed9182SOmar Sandoval btrfs_set_free_space_flags(leaf, info, flags); 285a5ed9182SOmar Sandoval expected_extent_count = btrfs_free_space_extent_count(leaf, info); 286a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 287a5ed9182SOmar Sandoval btrfs_release_path(path); 288a5ed9182SOmar Sandoval 289a5ed9182SOmar Sandoval if (extent_count != expected_extent_count) { 2905d163e0eSJeff Mahoney btrfs_err(fs_info, 2915d163e0eSJeff Mahoney "incorrect extent count for %llu; counted %u, expected %u", 292b3470b5dSDavid Sterba block_group->start, extent_count, 293a5ed9182SOmar Sandoval expected_extent_count); 294a5ed9182SOmar Sandoval ASSERT(0); 295a5ed9182SOmar Sandoval ret = -EIO; 296a5ed9182SOmar Sandoval goto out; 297a5ed9182SOmar Sandoval } 298a5ed9182SOmar Sandoval 299a565971fSHoward McLauchlan bitmap_cursor = (char *)bitmap; 3000b246afaSJeff Mahoney bitmap_range = fs_info->sectorsize * BTRFS_FREE_SPACE_BITMAP_BITS; 301a5ed9182SOmar Sandoval i = start; 302a5ed9182SOmar Sandoval while (i < end) { 303a5ed9182SOmar Sandoval unsigned long ptr; 304a5ed9182SOmar Sandoval u64 extent_size; 305a5ed9182SOmar Sandoval u32 data_size; 306a5ed9182SOmar Sandoval 307a5ed9182SOmar Sandoval extent_size = min(end - i, bitmap_range); 308098e6308SDavid Sterba data_size = free_space_bitmap_size(fs_info, extent_size); 309a5ed9182SOmar Sandoval 310a5ed9182SOmar Sandoval key.objectid = i; 311a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_BITMAP_KEY; 312a5ed9182SOmar Sandoval key.offset = extent_size; 313a5ed9182SOmar Sandoval 314a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, 315a5ed9182SOmar Sandoval data_size); 316a5ed9182SOmar Sandoval if (ret) 317a5ed9182SOmar Sandoval goto out; 318a5ed9182SOmar Sandoval 319a5ed9182SOmar Sandoval leaf = path->nodes[0]; 320a5ed9182SOmar Sandoval ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); 321a5ed9182SOmar Sandoval write_extent_buffer(leaf, bitmap_cursor, ptr, 322a5ed9182SOmar Sandoval data_size); 323a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 324a5ed9182SOmar Sandoval btrfs_release_path(path); 325a5ed9182SOmar Sandoval 326a5ed9182SOmar Sandoval i += extent_size; 327a5ed9182SOmar Sandoval bitmap_cursor += data_size; 328a5ed9182SOmar Sandoval } 329a5ed9182SOmar Sandoval 330a5ed9182SOmar Sandoval ret = 0; 331a5ed9182SOmar Sandoval out: 33279b134a2SDavid Sterba kvfree(bitmap); 333a5ed9182SOmar Sandoval if (ret) 33466642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 335a5ed9182SOmar Sandoval return ret; 336a5ed9182SOmar Sandoval } 337a5ed9182SOmar Sandoval 338ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 339a5ed9182SOmar Sandoval int convert_free_space_to_extents(struct btrfs_trans_handle *trans, 34032da5386SDavid Sterba struct btrfs_block_group *block_group, 341a5ed9182SOmar Sandoval struct btrfs_path *path) 342a5ed9182SOmar Sandoval { 3435296c2bfSNikolay Borisov struct btrfs_fs_info *fs_info = trans->fs_info; 3447939dd9fSJosef Bacik struct btrfs_root *root = btrfs_free_space_root(block_group); 345a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 346a5ed9182SOmar Sandoval struct btrfs_key key, found_key; 347a5ed9182SOmar Sandoval struct extent_buffer *leaf; 348a565971fSHoward McLauchlan unsigned long *bitmap; 349a5ed9182SOmar Sandoval u64 start, end; 350a5ed9182SOmar Sandoval u32 bitmap_size, flags, expected_extent_count; 351a565971fSHoward McLauchlan unsigned long nrbits, start_bit, end_bit; 352a5ed9182SOmar Sandoval u32 extent_count = 0; 353a5ed9182SOmar Sandoval int done = 0, nr; 354a5ed9182SOmar Sandoval int ret; 355a5ed9182SOmar Sandoval 356098e6308SDavid Sterba bitmap_size = free_space_bitmap_size(fs_info, block_group->length); 357a5ed9182SOmar Sandoval bitmap = alloc_bitmap(bitmap_size); 358a5ed9182SOmar Sandoval if (!bitmap) { 359a5ed9182SOmar Sandoval ret = -ENOMEM; 360a5ed9182SOmar Sandoval goto out; 361a5ed9182SOmar Sandoval } 362a5ed9182SOmar Sandoval 363b3470b5dSDavid Sterba start = block_group->start; 364b3470b5dSDavid Sterba end = block_group->start + block_group->length; 365a5ed9182SOmar Sandoval 366a5ed9182SOmar Sandoval key.objectid = end - 1; 367a5ed9182SOmar Sandoval key.type = (u8)-1; 368a5ed9182SOmar Sandoval key.offset = (u64)-1; 369a5ed9182SOmar Sandoval 370a5ed9182SOmar Sandoval while (!done) { 371a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 372a5ed9182SOmar Sandoval if (ret) 373a5ed9182SOmar Sandoval goto out; 374a5ed9182SOmar Sandoval 375a5ed9182SOmar Sandoval leaf = path->nodes[0]; 376a5ed9182SOmar Sandoval nr = 0; 377a5ed9182SOmar Sandoval path->slots[0]++; 378a5ed9182SOmar Sandoval while (path->slots[0] > 0) { 379a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0] - 1); 380a5ed9182SOmar Sandoval 381a5ed9182SOmar Sandoval if (found_key.type == BTRFS_FREE_SPACE_INFO_KEY) { 382b3470b5dSDavid Sterba ASSERT(found_key.objectid == block_group->start); 383b3470b5dSDavid Sterba ASSERT(found_key.offset == block_group->length); 384a5ed9182SOmar Sandoval done = 1; 385a5ed9182SOmar Sandoval break; 386a5ed9182SOmar Sandoval } else if (found_key.type == BTRFS_FREE_SPACE_BITMAP_KEY) { 387a5ed9182SOmar Sandoval unsigned long ptr; 388a565971fSHoward McLauchlan char *bitmap_cursor; 389a5ed9182SOmar Sandoval u32 bitmap_pos, data_size; 390a5ed9182SOmar Sandoval 391a5ed9182SOmar Sandoval ASSERT(found_key.objectid >= start); 392a5ed9182SOmar Sandoval ASSERT(found_key.objectid < end); 393a5ed9182SOmar Sandoval ASSERT(found_key.objectid + found_key.offset <= end); 394a5ed9182SOmar Sandoval 395a5ed9182SOmar Sandoval bitmap_pos = div_u64(found_key.objectid - start, 3960b246afaSJeff Mahoney fs_info->sectorsize * 397a5ed9182SOmar Sandoval BITS_PER_BYTE); 398a565971fSHoward McLauchlan bitmap_cursor = ((char *)bitmap) + bitmap_pos; 399098e6308SDavid Sterba data_size = free_space_bitmap_size(fs_info, 400098e6308SDavid Sterba found_key.offset); 401a5ed9182SOmar Sandoval 402a5ed9182SOmar Sandoval ptr = btrfs_item_ptr_offset(leaf, path->slots[0] - 1); 403a5ed9182SOmar Sandoval read_extent_buffer(leaf, bitmap_cursor, ptr, 404a5ed9182SOmar Sandoval data_size); 405a5ed9182SOmar Sandoval 406a5ed9182SOmar Sandoval nr++; 407a5ed9182SOmar Sandoval path->slots[0]--; 408a5ed9182SOmar Sandoval } else { 409a5ed9182SOmar Sandoval ASSERT(0); 410a5ed9182SOmar Sandoval } 411a5ed9182SOmar Sandoval } 412a5ed9182SOmar Sandoval 413a5ed9182SOmar Sandoval ret = btrfs_del_items(trans, root, path, path->slots[0], nr); 414a5ed9182SOmar Sandoval if (ret) 415a5ed9182SOmar Sandoval goto out; 416a5ed9182SOmar Sandoval btrfs_release_path(path); 417a5ed9182SOmar Sandoval } 418a5ed9182SOmar Sandoval 4192ccf545eSDavid Sterba info = search_free_space_info(trans, block_group, path, 1); 420a5ed9182SOmar Sandoval if (IS_ERR(info)) { 421a5ed9182SOmar Sandoval ret = PTR_ERR(info); 422a5ed9182SOmar Sandoval goto out; 423a5ed9182SOmar Sandoval } 424a5ed9182SOmar Sandoval leaf = path->nodes[0]; 425a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(leaf, info); 426a5ed9182SOmar Sandoval flags &= ~BTRFS_FREE_SPACE_USING_BITMAPS; 427a5ed9182SOmar Sandoval btrfs_set_free_space_flags(leaf, info, flags); 428a5ed9182SOmar Sandoval expected_extent_count = btrfs_free_space_extent_count(leaf, info); 429a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 430a5ed9182SOmar Sandoval btrfs_release_path(path); 431a5ed9182SOmar Sandoval 432ab108d99SDavid Sterba nrbits = block_group->length >> block_group->fs_info->sectorsize_bits; 433a565971fSHoward McLauchlan start_bit = find_next_bit_le(bitmap, nrbits, 0); 434a565971fSHoward McLauchlan 435a565971fSHoward McLauchlan while (start_bit < nrbits) { 436a565971fSHoward McLauchlan end_bit = find_next_zero_bit_le(bitmap, nrbits, start_bit); 437a565971fSHoward McLauchlan ASSERT(start_bit < end_bit); 438a565971fSHoward McLauchlan 439a565971fSHoward McLauchlan key.objectid = start + start_bit * block_group->fs_info->sectorsize; 440a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_EXTENT_KEY; 441a565971fSHoward McLauchlan key.offset = (end_bit - start_bit) * block_group->fs_info->sectorsize; 442a5ed9182SOmar Sandoval 443a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, 0); 444a5ed9182SOmar Sandoval if (ret) 445a5ed9182SOmar Sandoval goto out; 446a5ed9182SOmar Sandoval btrfs_release_path(path); 447a5ed9182SOmar Sandoval 448a5ed9182SOmar Sandoval extent_count++; 449a5ed9182SOmar Sandoval 450a565971fSHoward McLauchlan start_bit = find_next_bit_le(bitmap, nrbits, end_bit); 451a5ed9182SOmar Sandoval } 452a5ed9182SOmar Sandoval 453a5ed9182SOmar Sandoval if (extent_count != expected_extent_count) { 4545d163e0eSJeff Mahoney btrfs_err(fs_info, 4555d163e0eSJeff Mahoney "incorrect extent count for %llu; counted %u, expected %u", 456b3470b5dSDavid Sterba block_group->start, extent_count, 457a5ed9182SOmar Sandoval expected_extent_count); 458a5ed9182SOmar Sandoval ASSERT(0); 459a5ed9182SOmar Sandoval ret = -EIO; 460a5ed9182SOmar Sandoval goto out; 461a5ed9182SOmar Sandoval } 462a5ed9182SOmar Sandoval 463a5ed9182SOmar Sandoval ret = 0; 464a5ed9182SOmar Sandoval out: 46579b134a2SDavid Sterba kvfree(bitmap); 466a5ed9182SOmar Sandoval if (ret) 46766642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 468a5ed9182SOmar Sandoval return ret; 469a5ed9182SOmar Sandoval } 470a5ed9182SOmar Sandoval 471a5ed9182SOmar Sandoval static int update_free_space_extent_count(struct btrfs_trans_handle *trans, 47232da5386SDavid Sterba struct btrfs_block_group *block_group, 473a5ed9182SOmar Sandoval struct btrfs_path *path, 474a5ed9182SOmar Sandoval int new_extents) 475a5ed9182SOmar Sandoval { 476a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 477a5ed9182SOmar Sandoval u32 flags; 478a5ed9182SOmar Sandoval u32 extent_count; 479a5ed9182SOmar Sandoval int ret = 0; 480a5ed9182SOmar Sandoval 481a5ed9182SOmar Sandoval if (new_extents == 0) 482a5ed9182SOmar Sandoval return 0; 483a5ed9182SOmar Sandoval 4842ccf545eSDavid Sterba info = search_free_space_info(trans, block_group, path, 1); 485a5ed9182SOmar Sandoval if (IS_ERR(info)) { 486a5ed9182SOmar Sandoval ret = PTR_ERR(info); 487a5ed9182SOmar Sandoval goto out; 488a5ed9182SOmar Sandoval } 489a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(path->nodes[0], info); 490a5ed9182SOmar Sandoval extent_count = btrfs_free_space_extent_count(path->nodes[0], info); 491a5ed9182SOmar Sandoval 492a5ed9182SOmar Sandoval extent_count += new_extents; 493a5ed9182SOmar Sandoval btrfs_set_free_space_extent_count(path->nodes[0], info, extent_count); 494a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(path->nodes[0]); 495a5ed9182SOmar Sandoval btrfs_release_path(path); 496a5ed9182SOmar Sandoval 497a5ed9182SOmar Sandoval if (!(flags & BTRFS_FREE_SPACE_USING_BITMAPS) && 498a5ed9182SOmar Sandoval extent_count > block_group->bitmap_high_thresh) { 499719fb4deSNikolay Borisov ret = convert_free_space_to_bitmaps(trans, block_group, path); 500a5ed9182SOmar Sandoval } else if ((flags & BTRFS_FREE_SPACE_USING_BITMAPS) && 501a5ed9182SOmar Sandoval extent_count < block_group->bitmap_low_thresh) { 5025296c2bfSNikolay Borisov ret = convert_free_space_to_extents(trans, block_group, path); 503a5ed9182SOmar Sandoval } 504a5ed9182SOmar Sandoval 505a5ed9182SOmar Sandoval out: 506a5ed9182SOmar Sandoval return ret; 507a5ed9182SOmar Sandoval } 508a5ed9182SOmar Sandoval 509ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 51032da5386SDavid Sterba int free_space_test_bit(struct btrfs_block_group *block_group, 511a5ed9182SOmar Sandoval struct btrfs_path *path, u64 offset) 512a5ed9182SOmar Sandoval { 513a5ed9182SOmar Sandoval struct extent_buffer *leaf; 514a5ed9182SOmar Sandoval struct btrfs_key key; 515a5ed9182SOmar Sandoval u64 found_start, found_end; 516a5ed9182SOmar Sandoval unsigned long ptr, i; 517a5ed9182SOmar Sandoval 518a5ed9182SOmar Sandoval leaf = path->nodes[0]; 519a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); 520a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_BITMAP_KEY); 521a5ed9182SOmar Sandoval 522a5ed9182SOmar Sandoval found_start = key.objectid; 523a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 524a5ed9182SOmar Sandoval ASSERT(offset >= found_start && offset < found_end); 525a5ed9182SOmar Sandoval 526a5ed9182SOmar Sandoval ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); 527da17066cSJeff Mahoney i = div_u64(offset - found_start, 528da17066cSJeff Mahoney block_group->fs_info->sectorsize); 529a5ed9182SOmar Sandoval return !!extent_buffer_test_bit(leaf, ptr, i); 530a5ed9182SOmar Sandoval } 531a5ed9182SOmar Sandoval 53232da5386SDavid Sterba static void free_space_set_bits(struct btrfs_block_group *block_group, 533a5ed9182SOmar Sandoval struct btrfs_path *path, u64 *start, u64 *size, 534a5ed9182SOmar Sandoval int bit) 535a5ed9182SOmar Sandoval { 5360b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = block_group->fs_info; 537a5ed9182SOmar Sandoval struct extent_buffer *leaf; 538a5ed9182SOmar Sandoval struct btrfs_key key; 539a5ed9182SOmar Sandoval u64 end = *start + *size; 540a5ed9182SOmar Sandoval u64 found_start, found_end; 541a5ed9182SOmar Sandoval unsigned long ptr, first, last; 542a5ed9182SOmar Sandoval 543a5ed9182SOmar Sandoval leaf = path->nodes[0]; 544a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); 545a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_BITMAP_KEY); 546a5ed9182SOmar Sandoval 547a5ed9182SOmar Sandoval found_start = key.objectid; 548a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 549a5ed9182SOmar Sandoval ASSERT(*start >= found_start && *start < found_end); 550a5ed9182SOmar Sandoval ASSERT(end > found_start); 551a5ed9182SOmar Sandoval 552a5ed9182SOmar Sandoval if (end > found_end) 553a5ed9182SOmar Sandoval end = found_end; 554a5ed9182SOmar Sandoval 555a5ed9182SOmar Sandoval ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); 556ab108d99SDavid Sterba first = (*start - found_start) >> fs_info->sectorsize_bits; 557ab108d99SDavid Sterba last = (end - found_start) >> fs_info->sectorsize_bits; 558a5ed9182SOmar Sandoval if (bit) 559a5ed9182SOmar Sandoval extent_buffer_bitmap_set(leaf, ptr, first, last - first); 560a5ed9182SOmar Sandoval else 561a5ed9182SOmar Sandoval extent_buffer_bitmap_clear(leaf, ptr, first, last - first); 562a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 563a5ed9182SOmar Sandoval 564a5ed9182SOmar Sandoval *size -= end - *start; 565a5ed9182SOmar Sandoval *start = end; 566a5ed9182SOmar Sandoval } 567a5ed9182SOmar Sandoval 568a5ed9182SOmar Sandoval /* 569a5ed9182SOmar Sandoval * We can't use btrfs_next_item() in modify_free_space_bitmap() because 570a5ed9182SOmar Sandoval * btrfs_next_leaf() doesn't get the path for writing. We can forgo the fancy 571a5ed9182SOmar Sandoval * tree walking in btrfs_next_leaf() anyways because we know exactly what we're 572a5ed9182SOmar Sandoval * looking for. 573a5ed9182SOmar Sandoval */ 574a5ed9182SOmar Sandoval static int free_space_next_bitmap(struct btrfs_trans_handle *trans, 575a5ed9182SOmar Sandoval struct btrfs_root *root, struct btrfs_path *p) 576a5ed9182SOmar Sandoval { 577a5ed9182SOmar Sandoval struct btrfs_key key; 578a5ed9182SOmar Sandoval 579a5ed9182SOmar Sandoval if (p->slots[0] + 1 < btrfs_header_nritems(p->nodes[0])) { 580a5ed9182SOmar Sandoval p->slots[0]++; 581a5ed9182SOmar Sandoval return 0; 582a5ed9182SOmar Sandoval } 583a5ed9182SOmar Sandoval 584a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(p->nodes[0], &key, p->slots[0]); 585a5ed9182SOmar Sandoval btrfs_release_path(p); 586a5ed9182SOmar Sandoval 587a5ed9182SOmar Sandoval key.objectid += key.offset; 588a5ed9182SOmar Sandoval key.type = (u8)-1; 589a5ed9182SOmar Sandoval key.offset = (u64)-1; 590a5ed9182SOmar Sandoval 591a5ed9182SOmar Sandoval return btrfs_search_prev_slot(trans, root, &key, p, 0, 1); 592a5ed9182SOmar Sandoval } 593a5ed9182SOmar Sandoval 594a5ed9182SOmar Sandoval /* 595a5ed9182SOmar Sandoval * If remove is 1, then we are removing free space, thus clearing bits in the 596a5ed9182SOmar Sandoval * bitmap. If remove is 0, then we are adding free space, thus setting bits in 597a5ed9182SOmar Sandoval * the bitmap. 598a5ed9182SOmar Sandoval */ 599a5ed9182SOmar Sandoval static int modify_free_space_bitmap(struct btrfs_trans_handle *trans, 60032da5386SDavid Sterba struct btrfs_block_group *block_group, 601a5ed9182SOmar Sandoval struct btrfs_path *path, 602a5ed9182SOmar Sandoval u64 start, u64 size, int remove) 603a5ed9182SOmar Sandoval { 6047939dd9fSJosef Bacik struct btrfs_root *root = btrfs_free_space_root(block_group); 605a5ed9182SOmar Sandoval struct btrfs_key key; 606a5ed9182SOmar Sandoval u64 end = start + size; 607a5ed9182SOmar Sandoval u64 cur_start, cur_size; 608a5ed9182SOmar Sandoval int prev_bit, next_bit; 609a5ed9182SOmar Sandoval int new_extents; 610a5ed9182SOmar Sandoval int ret; 611a5ed9182SOmar Sandoval 612a5ed9182SOmar Sandoval /* 613a5ed9182SOmar Sandoval * Read the bit for the block immediately before the extent of space if 614a5ed9182SOmar Sandoval * that block is within the block group. 615a5ed9182SOmar Sandoval */ 616b3470b5dSDavid Sterba if (start > block_group->start) { 617da17066cSJeff Mahoney u64 prev_block = start - block_group->fs_info->sectorsize; 618a5ed9182SOmar Sandoval 619a5ed9182SOmar Sandoval key.objectid = prev_block; 620a5ed9182SOmar Sandoval key.type = (u8)-1; 621a5ed9182SOmar Sandoval key.offset = (u64)-1; 622a5ed9182SOmar Sandoval 623a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, 0, 1); 624a5ed9182SOmar Sandoval if (ret) 625a5ed9182SOmar Sandoval goto out; 626a5ed9182SOmar Sandoval 627a5ed9182SOmar Sandoval prev_bit = free_space_test_bit(block_group, path, prev_block); 628a5ed9182SOmar Sandoval 629a5ed9182SOmar Sandoval /* The previous block may have been in the previous bitmap. */ 630a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 631a5ed9182SOmar Sandoval if (start >= key.objectid + key.offset) { 632a5ed9182SOmar Sandoval ret = free_space_next_bitmap(trans, root, path); 633a5ed9182SOmar Sandoval if (ret) 634a5ed9182SOmar Sandoval goto out; 635a5ed9182SOmar Sandoval } 636a5ed9182SOmar Sandoval } else { 637a5ed9182SOmar Sandoval key.objectid = start; 638a5ed9182SOmar Sandoval key.type = (u8)-1; 639a5ed9182SOmar Sandoval key.offset = (u64)-1; 640a5ed9182SOmar Sandoval 641a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, 0, 1); 642a5ed9182SOmar Sandoval if (ret) 643a5ed9182SOmar Sandoval goto out; 644a5ed9182SOmar Sandoval 645a5ed9182SOmar Sandoval prev_bit = -1; 646a5ed9182SOmar Sandoval } 647a5ed9182SOmar Sandoval 648a5ed9182SOmar Sandoval /* 649a5ed9182SOmar Sandoval * Iterate over all of the bitmaps overlapped by the extent of space, 650a5ed9182SOmar Sandoval * clearing/setting bits as required. 651a5ed9182SOmar Sandoval */ 652a5ed9182SOmar Sandoval cur_start = start; 653a5ed9182SOmar Sandoval cur_size = size; 654a5ed9182SOmar Sandoval while (1) { 655a5ed9182SOmar Sandoval free_space_set_bits(block_group, path, &cur_start, &cur_size, 656a5ed9182SOmar Sandoval !remove); 657a5ed9182SOmar Sandoval if (cur_size == 0) 658a5ed9182SOmar Sandoval break; 659a5ed9182SOmar Sandoval ret = free_space_next_bitmap(trans, root, path); 660a5ed9182SOmar Sandoval if (ret) 661a5ed9182SOmar Sandoval goto out; 662a5ed9182SOmar Sandoval } 663a5ed9182SOmar Sandoval 664a5ed9182SOmar Sandoval /* 665a5ed9182SOmar Sandoval * Read the bit for the block immediately after the extent of space if 666a5ed9182SOmar Sandoval * that block is within the block group. 667a5ed9182SOmar Sandoval */ 668b3470b5dSDavid Sterba if (end < block_group->start + block_group->length) { 669a5ed9182SOmar Sandoval /* The next block may be in the next bitmap. */ 670a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 671a5ed9182SOmar Sandoval if (end >= key.objectid + key.offset) { 672a5ed9182SOmar Sandoval ret = free_space_next_bitmap(trans, root, path); 673a5ed9182SOmar Sandoval if (ret) 674a5ed9182SOmar Sandoval goto out; 675a5ed9182SOmar Sandoval } 676a5ed9182SOmar Sandoval 677a5ed9182SOmar Sandoval next_bit = free_space_test_bit(block_group, path, end); 678a5ed9182SOmar Sandoval } else { 679a5ed9182SOmar Sandoval next_bit = -1; 680a5ed9182SOmar Sandoval } 681a5ed9182SOmar Sandoval 682a5ed9182SOmar Sandoval if (remove) { 683a5ed9182SOmar Sandoval new_extents = -1; 684a5ed9182SOmar Sandoval if (prev_bit == 1) { 685a5ed9182SOmar Sandoval /* Leftover on the left. */ 686a5ed9182SOmar Sandoval new_extents++; 687a5ed9182SOmar Sandoval } 688a5ed9182SOmar Sandoval if (next_bit == 1) { 689a5ed9182SOmar Sandoval /* Leftover on the right. */ 690a5ed9182SOmar Sandoval new_extents++; 691a5ed9182SOmar Sandoval } 692a5ed9182SOmar Sandoval } else { 693a5ed9182SOmar Sandoval new_extents = 1; 694a5ed9182SOmar Sandoval if (prev_bit == 1) { 695a5ed9182SOmar Sandoval /* Merging with neighbor on the left. */ 696a5ed9182SOmar Sandoval new_extents--; 697a5ed9182SOmar Sandoval } 698a5ed9182SOmar Sandoval if (next_bit == 1) { 699a5ed9182SOmar Sandoval /* Merging with neighbor on the right. */ 700a5ed9182SOmar Sandoval new_extents--; 701a5ed9182SOmar Sandoval } 702a5ed9182SOmar Sandoval } 703a5ed9182SOmar Sandoval 704a5ed9182SOmar Sandoval btrfs_release_path(path); 705690d7682SNikolay Borisov ret = update_free_space_extent_count(trans, block_group, path, 706a5ed9182SOmar Sandoval new_extents); 707a5ed9182SOmar Sandoval 708a5ed9182SOmar Sandoval out: 709a5ed9182SOmar Sandoval return ret; 710a5ed9182SOmar Sandoval } 711a5ed9182SOmar Sandoval 712a5ed9182SOmar Sandoval static int remove_free_space_extent(struct btrfs_trans_handle *trans, 71332da5386SDavid Sterba struct btrfs_block_group *block_group, 714a5ed9182SOmar Sandoval struct btrfs_path *path, 715a5ed9182SOmar Sandoval u64 start, u64 size) 716a5ed9182SOmar Sandoval { 7177939dd9fSJosef Bacik struct btrfs_root *root = btrfs_free_space_root(block_group); 718a5ed9182SOmar Sandoval struct btrfs_key key; 719a5ed9182SOmar Sandoval u64 found_start, found_end; 720a5ed9182SOmar Sandoval u64 end = start + size; 721a5ed9182SOmar Sandoval int new_extents = -1; 722a5ed9182SOmar Sandoval int ret; 723a5ed9182SOmar Sandoval 724a5ed9182SOmar Sandoval key.objectid = start; 725a5ed9182SOmar Sandoval key.type = (u8)-1; 726a5ed9182SOmar Sandoval key.offset = (u64)-1; 727a5ed9182SOmar Sandoval 728a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 729a5ed9182SOmar Sandoval if (ret) 730a5ed9182SOmar Sandoval goto out; 731a5ed9182SOmar Sandoval 732a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 733a5ed9182SOmar Sandoval 734a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_EXTENT_KEY); 735a5ed9182SOmar Sandoval 736a5ed9182SOmar Sandoval found_start = key.objectid; 737a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 738a5ed9182SOmar Sandoval ASSERT(start >= found_start && end <= found_end); 739a5ed9182SOmar Sandoval 740a5ed9182SOmar Sandoval /* 741a5ed9182SOmar Sandoval * Okay, now that we've found the free space extent which contains the 742a5ed9182SOmar Sandoval * free space that we are removing, there are four cases: 743a5ed9182SOmar Sandoval * 744a5ed9182SOmar Sandoval * 1. We're using the whole extent: delete the key we found and 745a5ed9182SOmar Sandoval * decrement the free space extent count. 746a5ed9182SOmar Sandoval * 2. We are using part of the extent starting at the beginning: delete 747a5ed9182SOmar Sandoval * the key we found and insert a new key representing the leftover at 748a5ed9182SOmar Sandoval * the end. There is no net change in the number of extents. 749a5ed9182SOmar Sandoval * 3. We are using part of the extent ending at the end: delete the key 750a5ed9182SOmar Sandoval * we found and insert a new key representing the leftover at the 751a5ed9182SOmar Sandoval * beginning. There is no net change in the number of extents. 752a5ed9182SOmar Sandoval * 4. We are using part of the extent in the middle: delete the key we 753a5ed9182SOmar Sandoval * found and insert two new keys representing the leftovers on each 754a5ed9182SOmar Sandoval * side. Where we used to have one extent, we now have two, so increment 755a5ed9182SOmar Sandoval * the extent count. We may need to convert the block group to bitmaps 756a5ed9182SOmar Sandoval * as a result. 757a5ed9182SOmar Sandoval */ 758a5ed9182SOmar Sandoval 759a5ed9182SOmar Sandoval /* Delete the existing key (cases 1-4). */ 760a5ed9182SOmar Sandoval ret = btrfs_del_item(trans, root, path); 761a5ed9182SOmar Sandoval if (ret) 762a5ed9182SOmar Sandoval goto out; 763a5ed9182SOmar Sandoval 764a5ed9182SOmar Sandoval /* Add a key for leftovers at the beginning (cases 3 and 4). */ 765a5ed9182SOmar Sandoval if (start > found_start) { 766a5ed9182SOmar Sandoval key.objectid = found_start; 767a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_EXTENT_KEY; 768a5ed9182SOmar Sandoval key.offset = start - found_start; 769a5ed9182SOmar Sandoval 770a5ed9182SOmar Sandoval btrfs_release_path(path); 771a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, 0); 772a5ed9182SOmar Sandoval if (ret) 773a5ed9182SOmar Sandoval goto out; 774a5ed9182SOmar Sandoval new_extents++; 775a5ed9182SOmar Sandoval } 776a5ed9182SOmar Sandoval 777a5ed9182SOmar Sandoval /* Add a key for leftovers at the end (cases 2 and 4). */ 778a5ed9182SOmar Sandoval if (end < found_end) { 779a5ed9182SOmar Sandoval key.objectid = end; 780a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_EXTENT_KEY; 781a5ed9182SOmar Sandoval key.offset = found_end - end; 782a5ed9182SOmar Sandoval 783a5ed9182SOmar Sandoval btrfs_release_path(path); 784a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, 0); 785a5ed9182SOmar Sandoval if (ret) 786a5ed9182SOmar Sandoval goto out; 787a5ed9182SOmar Sandoval new_extents++; 788a5ed9182SOmar Sandoval } 789a5ed9182SOmar Sandoval 790a5ed9182SOmar Sandoval btrfs_release_path(path); 791690d7682SNikolay Borisov ret = update_free_space_extent_count(trans, block_group, path, 792a5ed9182SOmar Sandoval new_extents); 793a5ed9182SOmar Sandoval 794a5ed9182SOmar Sandoval out: 795a5ed9182SOmar Sandoval return ret; 796a5ed9182SOmar Sandoval } 797a5ed9182SOmar Sandoval 798ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 799a5ed9182SOmar Sandoval int __remove_from_free_space_tree(struct btrfs_trans_handle *trans, 80032da5386SDavid Sterba struct btrfs_block_group *block_group, 801a5ed9182SOmar Sandoval struct btrfs_path *path, u64 start, u64 size) 802a5ed9182SOmar Sandoval { 803a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 804a5ed9182SOmar Sandoval u32 flags; 805a5ed9182SOmar Sandoval int ret; 806a5ed9182SOmar Sandoval 807a5ed9182SOmar Sandoval if (block_group->needs_free_space) { 8089a7e0f92SNikolay Borisov ret = __add_block_group_free_space(trans, block_group, path); 809a5ed9182SOmar Sandoval if (ret) 810a5ed9182SOmar Sandoval return ret; 811a5ed9182SOmar Sandoval } 812a5ed9182SOmar Sandoval 8132ccf545eSDavid Sterba info = search_free_space_info(NULL, block_group, path, 0); 814a5ed9182SOmar Sandoval if (IS_ERR(info)) 815a5ed9182SOmar Sandoval return PTR_ERR(info); 816a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(path->nodes[0], info); 817a5ed9182SOmar Sandoval btrfs_release_path(path); 818a5ed9182SOmar Sandoval 819a5ed9182SOmar Sandoval if (flags & BTRFS_FREE_SPACE_USING_BITMAPS) { 82085a7ef13SNikolay Borisov return modify_free_space_bitmap(trans, block_group, path, 82185a7ef13SNikolay Borisov start, size, 1); 822a5ed9182SOmar Sandoval } else { 823e581168dSNikolay Borisov return remove_free_space_extent(trans, block_group, path, 824e581168dSNikolay Borisov start, size); 825a5ed9182SOmar Sandoval } 826a5ed9182SOmar Sandoval } 827a5ed9182SOmar Sandoval 828a5ed9182SOmar Sandoval int remove_from_free_space_tree(struct btrfs_trans_handle *trans, 829a5ed9182SOmar Sandoval u64 start, u64 size) 830a5ed9182SOmar Sandoval { 83132da5386SDavid Sterba struct btrfs_block_group *block_group; 832a5ed9182SOmar Sandoval struct btrfs_path *path; 833a5ed9182SOmar Sandoval int ret; 834a5ed9182SOmar Sandoval 83525a356d3SNikolay Borisov if (!btrfs_fs_compat_ro(trans->fs_info, FREE_SPACE_TREE)) 836a5ed9182SOmar Sandoval return 0; 837a5ed9182SOmar Sandoval 838a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 839a5ed9182SOmar Sandoval if (!path) { 840a5ed9182SOmar Sandoval ret = -ENOMEM; 841a5ed9182SOmar Sandoval goto out; 842a5ed9182SOmar Sandoval } 843a5ed9182SOmar Sandoval 84425a356d3SNikolay Borisov block_group = btrfs_lookup_block_group(trans->fs_info, start); 845a5ed9182SOmar Sandoval if (!block_group) { 846a5ed9182SOmar Sandoval ASSERT(0); 847a5ed9182SOmar Sandoval ret = -ENOENT; 848a5ed9182SOmar Sandoval goto out; 849a5ed9182SOmar Sandoval } 850a5ed9182SOmar Sandoval 851a5ed9182SOmar Sandoval mutex_lock(&block_group->free_space_lock); 852c31683a6SNikolay Borisov ret = __remove_from_free_space_tree(trans, block_group, path, start, 853c31683a6SNikolay Borisov size); 854a5ed9182SOmar Sandoval mutex_unlock(&block_group->free_space_lock); 855a5ed9182SOmar Sandoval 856a5ed9182SOmar Sandoval btrfs_put_block_group(block_group); 857a5ed9182SOmar Sandoval out: 858a5ed9182SOmar Sandoval btrfs_free_path(path); 859a5ed9182SOmar Sandoval if (ret) 86066642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 861a5ed9182SOmar Sandoval return ret; 862a5ed9182SOmar Sandoval } 863a5ed9182SOmar Sandoval 864a5ed9182SOmar Sandoval static int add_free_space_extent(struct btrfs_trans_handle *trans, 86532da5386SDavid Sterba struct btrfs_block_group *block_group, 866a5ed9182SOmar Sandoval struct btrfs_path *path, 867a5ed9182SOmar Sandoval u64 start, u64 size) 868a5ed9182SOmar Sandoval { 8697939dd9fSJosef Bacik struct btrfs_root *root = btrfs_free_space_root(block_group); 870a5ed9182SOmar Sandoval struct btrfs_key key, new_key; 871a5ed9182SOmar Sandoval u64 found_start, found_end; 872a5ed9182SOmar Sandoval u64 end = start + size; 873a5ed9182SOmar Sandoval int new_extents = 1; 874a5ed9182SOmar Sandoval int ret; 875a5ed9182SOmar Sandoval 876a5ed9182SOmar Sandoval /* 877a5ed9182SOmar Sandoval * We are adding a new extent of free space, but we need to merge 878a5ed9182SOmar Sandoval * extents. There are four cases here: 879a5ed9182SOmar Sandoval * 880a5ed9182SOmar Sandoval * 1. The new extent does not have any immediate neighbors to merge 881a5ed9182SOmar Sandoval * with: add the new key and increment the free space extent count. We 882a5ed9182SOmar Sandoval * may need to convert the block group to bitmaps as a result. 883a5ed9182SOmar Sandoval * 2. The new extent has an immediate neighbor before it: remove the 884a5ed9182SOmar Sandoval * previous key and insert a new key combining both of them. There is no 885a5ed9182SOmar Sandoval * net change in the number of extents. 886a5ed9182SOmar Sandoval * 3. The new extent has an immediate neighbor after it: remove the next 887a5ed9182SOmar Sandoval * key and insert a new key combining both of them. There is no net 888a5ed9182SOmar Sandoval * change in the number of extents. 889a5ed9182SOmar Sandoval * 4. The new extent has immediate neighbors on both sides: remove both 890a5ed9182SOmar Sandoval * of the keys and insert a new key combining all of them. Where we used 891a5ed9182SOmar Sandoval * to have two extents, we now have one, so decrement the extent count. 892a5ed9182SOmar Sandoval */ 893a5ed9182SOmar Sandoval 894a5ed9182SOmar Sandoval new_key.objectid = start; 895a5ed9182SOmar Sandoval new_key.type = BTRFS_FREE_SPACE_EXTENT_KEY; 896a5ed9182SOmar Sandoval new_key.offset = size; 897a5ed9182SOmar Sandoval 898a5ed9182SOmar Sandoval /* Search for a neighbor on the left. */ 899b3470b5dSDavid Sterba if (start == block_group->start) 900a5ed9182SOmar Sandoval goto right; 901a5ed9182SOmar Sandoval key.objectid = start - 1; 902a5ed9182SOmar Sandoval key.type = (u8)-1; 903a5ed9182SOmar Sandoval key.offset = (u64)-1; 904a5ed9182SOmar Sandoval 905a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 906a5ed9182SOmar Sandoval if (ret) 907a5ed9182SOmar Sandoval goto out; 908a5ed9182SOmar Sandoval 909a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 910a5ed9182SOmar Sandoval 911a5ed9182SOmar Sandoval if (key.type != BTRFS_FREE_SPACE_EXTENT_KEY) { 912a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_INFO_KEY); 913a5ed9182SOmar Sandoval btrfs_release_path(path); 914a5ed9182SOmar Sandoval goto right; 915a5ed9182SOmar Sandoval } 916a5ed9182SOmar Sandoval 917a5ed9182SOmar Sandoval found_start = key.objectid; 918a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 919b3470b5dSDavid Sterba ASSERT(found_start >= block_group->start && 920b3470b5dSDavid Sterba found_end > block_group->start); 921a5ed9182SOmar Sandoval ASSERT(found_start < start && found_end <= start); 922a5ed9182SOmar Sandoval 923a5ed9182SOmar Sandoval /* 924a5ed9182SOmar Sandoval * Delete the neighbor on the left and absorb it into the new key (cases 925a5ed9182SOmar Sandoval * 2 and 4). 926a5ed9182SOmar Sandoval */ 927a5ed9182SOmar Sandoval if (found_end == start) { 928a5ed9182SOmar Sandoval ret = btrfs_del_item(trans, root, path); 929a5ed9182SOmar Sandoval if (ret) 930a5ed9182SOmar Sandoval goto out; 931a5ed9182SOmar Sandoval new_key.objectid = found_start; 932a5ed9182SOmar Sandoval new_key.offset += key.offset; 933a5ed9182SOmar Sandoval new_extents--; 934a5ed9182SOmar Sandoval } 935a5ed9182SOmar Sandoval btrfs_release_path(path); 936a5ed9182SOmar Sandoval 937a5ed9182SOmar Sandoval right: 938a5ed9182SOmar Sandoval /* Search for a neighbor on the right. */ 939b3470b5dSDavid Sterba if (end == block_group->start + block_group->length) 940a5ed9182SOmar Sandoval goto insert; 941a5ed9182SOmar Sandoval key.objectid = end; 942a5ed9182SOmar Sandoval key.type = (u8)-1; 943a5ed9182SOmar Sandoval key.offset = (u64)-1; 944a5ed9182SOmar Sandoval 945a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 946a5ed9182SOmar Sandoval if (ret) 947a5ed9182SOmar Sandoval goto out; 948a5ed9182SOmar Sandoval 949a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 950a5ed9182SOmar Sandoval 951a5ed9182SOmar Sandoval if (key.type != BTRFS_FREE_SPACE_EXTENT_KEY) { 952a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_INFO_KEY); 953a5ed9182SOmar Sandoval btrfs_release_path(path); 954a5ed9182SOmar Sandoval goto insert; 955a5ed9182SOmar Sandoval } 956a5ed9182SOmar Sandoval 957a5ed9182SOmar Sandoval found_start = key.objectid; 958a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 959b3470b5dSDavid Sterba ASSERT(found_start >= block_group->start && 960b3470b5dSDavid Sterba found_end > block_group->start); 961a5ed9182SOmar Sandoval ASSERT((found_start < start && found_end <= start) || 962a5ed9182SOmar Sandoval (found_start >= end && found_end > end)); 963a5ed9182SOmar Sandoval 964a5ed9182SOmar Sandoval /* 965a5ed9182SOmar Sandoval * Delete the neighbor on the right and absorb it into the new key 966a5ed9182SOmar Sandoval * (cases 3 and 4). 967a5ed9182SOmar Sandoval */ 968a5ed9182SOmar Sandoval if (found_start == end) { 969a5ed9182SOmar Sandoval ret = btrfs_del_item(trans, root, path); 970a5ed9182SOmar Sandoval if (ret) 971a5ed9182SOmar Sandoval goto out; 972a5ed9182SOmar Sandoval new_key.offset += key.offset; 973a5ed9182SOmar Sandoval new_extents--; 974a5ed9182SOmar Sandoval } 975a5ed9182SOmar Sandoval btrfs_release_path(path); 976a5ed9182SOmar Sandoval 977a5ed9182SOmar Sandoval insert: 978a5ed9182SOmar Sandoval /* Insert the new key (cases 1-4). */ 979a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &new_key, 0); 980a5ed9182SOmar Sandoval if (ret) 981a5ed9182SOmar Sandoval goto out; 982a5ed9182SOmar Sandoval 983a5ed9182SOmar Sandoval btrfs_release_path(path); 984690d7682SNikolay Borisov ret = update_free_space_extent_count(trans, block_group, path, 985a5ed9182SOmar Sandoval new_extents); 986a5ed9182SOmar Sandoval 987a5ed9182SOmar Sandoval out: 988a5ed9182SOmar Sandoval return ret; 989a5ed9182SOmar Sandoval } 990a5ed9182SOmar Sandoval 991ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 992a5ed9182SOmar Sandoval int __add_to_free_space_tree(struct btrfs_trans_handle *trans, 99332da5386SDavid Sterba struct btrfs_block_group *block_group, 994a5ed9182SOmar Sandoval struct btrfs_path *path, u64 start, u64 size) 995a5ed9182SOmar Sandoval { 996a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 997a5ed9182SOmar Sandoval u32 flags; 998a5ed9182SOmar Sandoval int ret; 999a5ed9182SOmar Sandoval 1000a5ed9182SOmar Sandoval if (block_group->needs_free_space) { 10019a7e0f92SNikolay Borisov ret = __add_block_group_free_space(trans, block_group, path); 1002a5ed9182SOmar Sandoval if (ret) 1003a5ed9182SOmar Sandoval return ret; 1004a5ed9182SOmar Sandoval } 1005a5ed9182SOmar Sandoval 10062ccf545eSDavid Sterba info = search_free_space_info(NULL, block_group, path, 0); 1007a5ed9182SOmar Sandoval if (IS_ERR(info)) 1008a5ed9182SOmar Sandoval return PTR_ERR(info); 1009a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(path->nodes[0], info); 1010a5ed9182SOmar Sandoval btrfs_release_path(path); 1011a5ed9182SOmar Sandoval 1012a5ed9182SOmar Sandoval if (flags & BTRFS_FREE_SPACE_USING_BITMAPS) { 101385a7ef13SNikolay Borisov return modify_free_space_bitmap(trans, block_group, path, 101485a7ef13SNikolay Borisov start, size, 0); 1015a5ed9182SOmar Sandoval } else { 10165cb17822SNikolay Borisov return add_free_space_extent(trans, block_group, path, start, 10175cb17822SNikolay Borisov size); 1018a5ed9182SOmar Sandoval } 1019a5ed9182SOmar Sandoval } 1020a5ed9182SOmar Sandoval 1021a5ed9182SOmar Sandoval int add_to_free_space_tree(struct btrfs_trans_handle *trans, 1022a5ed9182SOmar Sandoval u64 start, u64 size) 1023a5ed9182SOmar Sandoval { 102432da5386SDavid Sterba struct btrfs_block_group *block_group; 1025a5ed9182SOmar Sandoval struct btrfs_path *path; 1026a5ed9182SOmar Sandoval int ret; 1027a5ed9182SOmar Sandoval 1028e7355e50SNikolay Borisov if (!btrfs_fs_compat_ro(trans->fs_info, FREE_SPACE_TREE)) 1029a5ed9182SOmar Sandoval return 0; 1030a5ed9182SOmar Sandoval 1031a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1032a5ed9182SOmar Sandoval if (!path) { 1033a5ed9182SOmar Sandoval ret = -ENOMEM; 1034a5ed9182SOmar Sandoval goto out; 1035a5ed9182SOmar Sandoval } 1036a5ed9182SOmar Sandoval 1037e7355e50SNikolay Borisov block_group = btrfs_lookup_block_group(trans->fs_info, start); 1038a5ed9182SOmar Sandoval if (!block_group) { 1039a5ed9182SOmar Sandoval ASSERT(0); 1040a5ed9182SOmar Sandoval ret = -ENOENT; 1041a5ed9182SOmar Sandoval goto out; 1042a5ed9182SOmar Sandoval } 1043a5ed9182SOmar Sandoval 1044a5ed9182SOmar Sandoval mutex_lock(&block_group->free_space_lock); 10452d5cffa1SNikolay Borisov ret = __add_to_free_space_tree(trans, block_group, path, start, size); 1046a5ed9182SOmar Sandoval mutex_unlock(&block_group->free_space_lock); 1047a5ed9182SOmar Sandoval 1048a5ed9182SOmar Sandoval btrfs_put_block_group(block_group); 1049a5ed9182SOmar Sandoval out: 1050a5ed9182SOmar Sandoval btrfs_free_path(path); 1051a5ed9182SOmar Sandoval if (ret) 105266642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 1053a5ed9182SOmar Sandoval return ret; 1054a5ed9182SOmar Sandoval } 1055a5ed9182SOmar Sandoval 1056a5ed9182SOmar Sandoval /* 1057a5ed9182SOmar Sandoval * Populate the free space tree by walking the extent tree. Operations on the 1058a5ed9182SOmar Sandoval * extent tree that happen as a result of writes to the free space tree will go 1059a5ed9182SOmar Sandoval * through the normal add/remove hooks. 1060a5ed9182SOmar Sandoval */ 1061a5ed9182SOmar Sandoval static int populate_free_space_tree(struct btrfs_trans_handle *trans, 106232da5386SDavid Sterba struct btrfs_block_group *block_group) 1063a5ed9182SOmar Sandoval { 106429cbcf40SJosef Bacik struct btrfs_root *extent_root; 1065a5ed9182SOmar Sandoval struct btrfs_path *path, *path2; 1066a5ed9182SOmar Sandoval struct btrfs_key key; 1067a5ed9182SOmar Sandoval u64 start, end; 1068a5ed9182SOmar Sandoval int ret; 1069a5ed9182SOmar Sandoval 1070a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1071a5ed9182SOmar Sandoval if (!path) 1072a5ed9182SOmar Sandoval return -ENOMEM; 1073019599adSGu Jinxiang path->reada = READA_FORWARD; 1074a5ed9182SOmar Sandoval 1075a5ed9182SOmar Sandoval path2 = btrfs_alloc_path(); 1076a5ed9182SOmar Sandoval if (!path2) { 1077a5ed9182SOmar Sandoval btrfs_free_path(path); 1078a5ed9182SOmar Sandoval return -ENOMEM; 1079a5ed9182SOmar Sandoval } 1080a5ed9182SOmar Sandoval 108166afee18SNikolay Borisov ret = add_new_free_space_info(trans, block_group, path2); 1082a5ed9182SOmar Sandoval if (ret) 1083a5ed9182SOmar Sandoval goto out; 1084a5ed9182SOmar Sandoval 1085511711afSChris Mason mutex_lock(&block_group->free_space_lock); 1086511711afSChris Mason 1087a5ed9182SOmar Sandoval /* 1088a5ed9182SOmar Sandoval * Iterate through all of the extent and metadata items in this block 1089a5ed9182SOmar Sandoval * group, adding the free space between them and the free space at the 1090a5ed9182SOmar Sandoval * end. Note that EXTENT_ITEM and METADATA_ITEM are less than 1091a5ed9182SOmar Sandoval * BLOCK_GROUP_ITEM, so an extent may precede the block group that it's 1092a5ed9182SOmar Sandoval * contained in. 1093a5ed9182SOmar Sandoval */ 1094b3470b5dSDavid Sterba key.objectid = block_group->start; 1095a5ed9182SOmar Sandoval key.type = BTRFS_EXTENT_ITEM_KEY; 1096a5ed9182SOmar Sandoval key.offset = 0; 1097a5ed9182SOmar Sandoval 109829cbcf40SJosef Bacik extent_root = btrfs_extent_root(trans->fs_info, key.objectid); 1099a5ed9182SOmar Sandoval ret = btrfs_search_slot_for_read(extent_root, &key, path, 1, 0); 1100a5ed9182SOmar Sandoval if (ret < 0) 1101511711afSChris Mason goto out_locked; 1102a5ed9182SOmar Sandoval ASSERT(ret == 0); 1103a5ed9182SOmar Sandoval 1104b3470b5dSDavid Sterba start = block_group->start; 1105b3470b5dSDavid Sterba end = block_group->start + block_group->length; 1106a5ed9182SOmar Sandoval while (1) { 1107a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 1108a5ed9182SOmar Sandoval 1109a5ed9182SOmar Sandoval if (key.type == BTRFS_EXTENT_ITEM_KEY || 1110a5ed9182SOmar Sandoval key.type == BTRFS_METADATA_ITEM_KEY) { 1111a5ed9182SOmar Sandoval if (key.objectid >= end) 1112a5ed9182SOmar Sandoval break; 1113a5ed9182SOmar Sandoval 1114a5ed9182SOmar Sandoval if (start < key.objectid) { 11152d5cffa1SNikolay Borisov ret = __add_to_free_space_tree(trans, 1116a5ed9182SOmar Sandoval block_group, 1117a5ed9182SOmar Sandoval path2, start, 1118a5ed9182SOmar Sandoval key.objectid - 1119a5ed9182SOmar Sandoval start); 1120a5ed9182SOmar Sandoval if (ret) 1121511711afSChris Mason goto out_locked; 1122a5ed9182SOmar Sandoval } 1123a5ed9182SOmar Sandoval start = key.objectid; 1124a5ed9182SOmar Sandoval if (key.type == BTRFS_METADATA_ITEM_KEY) 1125ffa9a9efSNikolay Borisov start += trans->fs_info->nodesize; 1126a5ed9182SOmar Sandoval else 1127a5ed9182SOmar Sandoval start += key.offset; 1128a5ed9182SOmar Sandoval } else if (key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { 1129b3470b5dSDavid Sterba if (key.objectid != block_group->start) 1130a5ed9182SOmar Sandoval break; 1131a5ed9182SOmar Sandoval } 1132a5ed9182SOmar Sandoval 1133a5ed9182SOmar Sandoval ret = btrfs_next_item(extent_root, path); 1134a5ed9182SOmar Sandoval if (ret < 0) 1135511711afSChris Mason goto out_locked; 1136a5ed9182SOmar Sandoval if (ret) 1137a5ed9182SOmar Sandoval break; 1138a5ed9182SOmar Sandoval } 1139a5ed9182SOmar Sandoval if (start < end) { 11402d5cffa1SNikolay Borisov ret = __add_to_free_space_tree(trans, block_group, path2, 11412d5cffa1SNikolay Borisov start, end - start); 1142a5ed9182SOmar Sandoval if (ret) 1143511711afSChris Mason goto out_locked; 1144a5ed9182SOmar Sandoval } 1145a5ed9182SOmar Sandoval 1146a5ed9182SOmar Sandoval ret = 0; 1147511711afSChris Mason out_locked: 1148511711afSChris Mason mutex_unlock(&block_group->free_space_lock); 1149a5ed9182SOmar Sandoval out: 1150a5ed9182SOmar Sandoval btrfs_free_path(path2); 1151a5ed9182SOmar Sandoval btrfs_free_path(path); 1152a5ed9182SOmar Sandoval return ret; 1153a5ed9182SOmar Sandoval } 1154a5ed9182SOmar Sandoval 1155a5ed9182SOmar Sandoval int btrfs_create_free_space_tree(struct btrfs_fs_info *fs_info) 1156a5ed9182SOmar Sandoval { 1157a5ed9182SOmar Sandoval struct btrfs_trans_handle *trans; 1158a5ed9182SOmar Sandoval struct btrfs_root *tree_root = fs_info->tree_root; 1159a5ed9182SOmar Sandoval struct btrfs_root *free_space_root; 116032da5386SDavid Sterba struct btrfs_block_group *block_group; 1161a5ed9182SOmar Sandoval struct rb_node *node; 1162a5ed9182SOmar Sandoval int ret; 1163a5ed9182SOmar Sandoval 1164a5ed9182SOmar Sandoval trans = btrfs_start_transaction(tree_root, 0); 1165a5ed9182SOmar Sandoval if (IS_ERR(trans)) 1166a5ed9182SOmar Sandoval return PTR_ERR(trans); 1167a5ed9182SOmar Sandoval 1168afcdd129SJosef Bacik set_bit(BTRFS_FS_CREATING_FREE_SPACE_TREE, &fs_info->flags); 11692f96e402SJosef Bacik set_bit(BTRFS_FS_FREE_SPACE_TREE_UNTRUSTED, &fs_info->flags); 11709b7a2440SDavid Sterba free_space_root = btrfs_create_tree(trans, 1171a5ed9182SOmar Sandoval BTRFS_FREE_SPACE_TREE_OBJECTID); 1172a5ed9182SOmar Sandoval if (IS_ERR(free_space_root)) { 1173a5ed9182SOmar Sandoval ret = PTR_ERR(free_space_root); 1174a5ed9182SOmar Sandoval goto abort; 1175a5ed9182SOmar Sandoval } 1176abed4aaaSJosef Bacik ret = btrfs_global_root_insert(free_space_root); 1177abed4aaaSJosef Bacik if (ret) { 1178abed4aaaSJosef Bacik btrfs_put_root(free_space_root); 1179abed4aaaSJosef Bacik goto abort; 1180abed4aaaSJosef Bacik } 1181a5ed9182SOmar Sandoval 118208dddb29SFilipe Manana node = rb_first_cached(&fs_info->block_group_cache_tree); 1183a5ed9182SOmar Sandoval while (node) { 118432da5386SDavid Sterba block_group = rb_entry(node, struct btrfs_block_group, 1185a5ed9182SOmar Sandoval cache_node); 1186ffa9a9efSNikolay Borisov ret = populate_free_space_tree(trans, block_group); 1187a5ed9182SOmar Sandoval if (ret) 1188a5ed9182SOmar Sandoval goto abort; 1189a5ed9182SOmar Sandoval node = rb_next(node); 1190a5ed9182SOmar Sandoval } 1191a5ed9182SOmar Sandoval 1192a5ed9182SOmar Sandoval btrfs_set_fs_compat_ro(fs_info, FREE_SPACE_TREE); 11936675df31SOmar Sandoval btrfs_set_fs_compat_ro(fs_info, FREE_SPACE_TREE_VALID); 1194afcdd129SJosef Bacik clear_bit(BTRFS_FS_CREATING_FREE_SPACE_TREE, &fs_info->flags); 11952f96e402SJosef Bacik ret = btrfs_commit_transaction(trans); 1196a5ed9182SOmar Sandoval 11972f96e402SJosef Bacik /* 11982f96e402SJosef Bacik * Now that we've committed the transaction any reading of our commit 11992f96e402SJosef Bacik * root will be safe, so we can cache from the free space tree now. 12002f96e402SJosef Bacik */ 12012f96e402SJosef Bacik clear_bit(BTRFS_FS_FREE_SPACE_TREE_UNTRUSTED, &fs_info->flags); 12022f96e402SJosef Bacik return ret; 1203a5ed9182SOmar Sandoval 1204a5ed9182SOmar Sandoval abort: 1205afcdd129SJosef Bacik clear_bit(BTRFS_FS_CREATING_FREE_SPACE_TREE, &fs_info->flags); 12062f96e402SJosef Bacik clear_bit(BTRFS_FS_FREE_SPACE_TREE_UNTRUSTED, &fs_info->flags); 120766642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 12083a45bb20SJeff Mahoney btrfs_end_transaction(trans); 1209a5ed9182SOmar Sandoval return ret; 1210a5ed9182SOmar Sandoval } 1211a5ed9182SOmar Sandoval 1212a5ed9182SOmar Sandoval static int clear_free_space_tree(struct btrfs_trans_handle *trans, 1213a5ed9182SOmar Sandoval struct btrfs_root *root) 1214a5ed9182SOmar Sandoval { 1215a5ed9182SOmar Sandoval struct btrfs_path *path; 1216a5ed9182SOmar Sandoval struct btrfs_key key; 1217a5ed9182SOmar Sandoval int nr; 1218a5ed9182SOmar Sandoval int ret; 1219a5ed9182SOmar Sandoval 1220a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1221a5ed9182SOmar Sandoval if (!path) 1222a5ed9182SOmar Sandoval return -ENOMEM; 1223a5ed9182SOmar Sandoval 1224a5ed9182SOmar Sandoval key.objectid = 0; 1225a5ed9182SOmar Sandoval key.type = 0; 1226a5ed9182SOmar Sandoval key.offset = 0; 1227a5ed9182SOmar Sandoval 1228a5ed9182SOmar Sandoval while (1) { 1229a5ed9182SOmar Sandoval ret = btrfs_search_slot(trans, root, &key, path, -1, 1); 1230a5ed9182SOmar Sandoval if (ret < 0) 1231a5ed9182SOmar Sandoval goto out; 1232a5ed9182SOmar Sandoval 1233a5ed9182SOmar Sandoval nr = btrfs_header_nritems(path->nodes[0]); 1234a5ed9182SOmar Sandoval if (!nr) 1235a5ed9182SOmar Sandoval break; 1236a5ed9182SOmar Sandoval 1237a5ed9182SOmar Sandoval path->slots[0] = 0; 1238a5ed9182SOmar Sandoval ret = btrfs_del_items(trans, root, path, 0, nr); 1239a5ed9182SOmar Sandoval if (ret) 1240a5ed9182SOmar Sandoval goto out; 1241a5ed9182SOmar Sandoval 1242a5ed9182SOmar Sandoval btrfs_release_path(path); 1243a5ed9182SOmar Sandoval } 1244a5ed9182SOmar Sandoval 1245a5ed9182SOmar Sandoval ret = 0; 1246a5ed9182SOmar Sandoval out: 1247a5ed9182SOmar Sandoval btrfs_free_path(path); 1248a5ed9182SOmar Sandoval return ret; 1249a5ed9182SOmar Sandoval } 1250a5ed9182SOmar Sandoval 1251a5ed9182SOmar Sandoval int btrfs_clear_free_space_tree(struct btrfs_fs_info *fs_info) 1252a5ed9182SOmar Sandoval { 1253a5ed9182SOmar Sandoval struct btrfs_trans_handle *trans; 1254a5ed9182SOmar Sandoval struct btrfs_root *tree_root = fs_info->tree_root; 1255abed4aaaSJosef Bacik struct btrfs_key key = { 1256abed4aaaSJosef Bacik .objectid = BTRFS_FREE_SPACE_TREE_OBJECTID, 1257abed4aaaSJosef Bacik .type = BTRFS_ROOT_ITEM_KEY, 1258abed4aaaSJosef Bacik .offset = 0, 1259abed4aaaSJosef Bacik }; 1260abed4aaaSJosef Bacik struct btrfs_root *free_space_root = btrfs_global_root(fs_info, &key); 1261a5ed9182SOmar Sandoval int ret; 1262a5ed9182SOmar Sandoval 1263a5ed9182SOmar Sandoval trans = btrfs_start_transaction(tree_root, 0); 1264a5ed9182SOmar Sandoval if (IS_ERR(trans)) 1265a5ed9182SOmar Sandoval return PTR_ERR(trans); 1266a5ed9182SOmar Sandoval 1267a5ed9182SOmar Sandoval btrfs_clear_fs_compat_ro(fs_info, FREE_SPACE_TREE); 12686675df31SOmar Sandoval btrfs_clear_fs_compat_ro(fs_info, FREE_SPACE_TREE_VALID); 1269a5ed9182SOmar Sandoval 1270a5ed9182SOmar Sandoval ret = clear_free_space_tree(trans, free_space_root); 1271a5ed9182SOmar Sandoval if (ret) 1272a5ed9182SOmar Sandoval goto abort; 1273a5ed9182SOmar Sandoval 1274ab9ce7d4SLu Fengqi ret = btrfs_del_root(trans, &free_space_root->root_key); 1275a5ed9182SOmar Sandoval if (ret) 1276a5ed9182SOmar Sandoval goto abort; 1277a5ed9182SOmar Sandoval 1278abed4aaaSJosef Bacik btrfs_global_root_delete(free_space_root); 1279a5ed9182SOmar Sandoval list_del(&free_space_root->dirty_list); 1280a5ed9182SOmar Sandoval 1281a5ed9182SOmar Sandoval btrfs_tree_lock(free_space_root->node); 12826a884d7dSDavid Sterba btrfs_clean_tree_block(free_space_root->node); 1283a5ed9182SOmar Sandoval btrfs_tree_unlock(free_space_root->node); 12847a163608SFilipe Manana btrfs_free_tree_block(trans, btrfs_root_id(free_space_root), 12857a163608SFilipe Manana free_space_root->node, 0, 1); 1286a5ed9182SOmar Sandoval 128700246528SJosef Bacik btrfs_put_root(free_space_root); 1288a5ed9182SOmar Sandoval 12890bef7109SSahil Kang return btrfs_commit_transaction(trans); 1290a5ed9182SOmar Sandoval 1291a5ed9182SOmar Sandoval abort: 129266642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 12933a45bb20SJeff Mahoney btrfs_end_transaction(trans); 1294a5ed9182SOmar Sandoval return ret; 1295a5ed9182SOmar Sandoval } 1296a5ed9182SOmar Sandoval 1297a5ed9182SOmar Sandoval static int __add_block_group_free_space(struct btrfs_trans_handle *trans, 129832da5386SDavid Sterba struct btrfs_block_group *block_group, 1299a5ed9182SOmar Sandoval struct btrfs_path *path) 1300a5ed9182SOmar Sandoval { 1301a5ed9182SOmar Sandoval int ret; 1302a5ed9182SOmar Sandoval 1303a5ed9182SOmar Sandoval block_group->needs_free_space = 0; 1304a5ed9182SOmar Sandoval 130566afee18SNikolay Borisov ret = add_new_free_space_info(trans, block_group, path); 1306a5ed9182SOmar Sandoval if (ret) 1307a5ed9182SOmar Sandoval return ret; 1308a5ed9182SOmar Sandoval 13092d5cffa1SNikolay Borisov return __add_to_free_space_tree(trans, block_group, path, 1310b3470b5dSDavid Sterba block_group->start, 1311b3470b5dSDavid Sterba block_group->length); 1312a5ed9182SOmar Sandoval } 1313a5ed9182SOmar Sandoval 1314a5ed9182SOmar Sandoval int add_block_group_free_space(struct btrfs_trans_handle *trans, 131532da5386SDavid Sterba struct btrfs_block_group *block_group) 1316a5ed9182SOmar Sandoval { 1317e4e0711cSNikolay Borisov struct btrfs_fs_info *fs_info = trans->fs_info; 1318a5ed9182SOmar Sandoval struct btrfs_path *path = NULL; 1319a5ed9182SOmar Sandoval int ret = 0; 1320a5ed9182SOmar Sandoval 1321a5ed9182SOmar Sandoval if (!btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) 1322a5ed9182SOmar Sandoval return 0; 1323a5ed9182SOmar Sandoval 1324a5ed9182SOmar Sandoval mutex_lock(&block_group->free_space_lock); 1325a5ed9182SOmar Sandoval if (!block_group->needs_free_space) 1326a5ed9182SOmar Sandoval goto out; 1327a5ed9182SOmar Sandoval 1328a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1329a5ed9182SOmar Sandoval if (!path) { 1330a5ed9182SOmar Sandoval ret = -ENOMEM; 1331a5ed9182SOmar Sandoval goto out; 1332a5ed9182SOmar Sandoval } 1333a5ed9182SOmar Sandoval 13349a7e0f92SNikolay Borisov ret = __add_block_group_free_space(trans, block_group, path); 1335a5ed9182SOmar Sandoval 1336a5ed9182SOmar Sandoval out: 1337a5ed9182SOmar Sandoval btrfs_free_path(path); 1338a5ed9182SOmar Sandoval mutex_unlock(&block_group->free_space_lock); 1339a5ed9182SOmar Sandoval if (ret) 134066642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 1341a5ed9182SOmar Sandoval return ret; 1342a5ed9182SOmar Sandoval } 1343a5ed9182SOmar Sandoval 1344a5ed9182SOmar Sandoval int remove_block_group_free_space(struct btrfs_trans_handle *trans, 134532da5386SDavid Sterba struct btrfs_block_group *block_group) 1346a5ed9182SOmar Sandoval { 13477939dd9fSJosef Bacik struct btrfs_root *root = btrfs_free_space_root(block_group); 1348a5ed9182SOmar Sandoval struct btrfs_path *path; 1349a5ed9182SOmar Sandoval struct btrfs_key key, found_key; 1350a5ed9182SOmar Sandoval struct extent_buffer *leaf; 1351a5ed9182SOmar Sandoval u64 start, end; 1352a5ed9182SOmar Sandoval int done = 0, nr; 1353a5ed9182SOmar Sandoval int ret; 1354a5ed9182SOmar Sandoval 1355f3f72779SNikolay Borisov if (!btrfs_fs_compat_ro(trans->fs_info, FREE_SPACE_TREE)) 1356a5ed9182SOmar Sandoval return 0; 1357a5ed9182SOmar Sandoval 1358a5ed9182SOmar Sandoval if (block_group->needs_free_space) { 1359a5ed9182SOmar Sandoval /* We never added this block group to the free space tree. */ 1360a5ed9182SOmar Sandoval return 0; 1361a5ed9182SOmar Sandoval } 1362a5ed9182SOmar Sandoval 1363a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1364a5ed9182SOmar Sandoval if (!path) { 1365a5ed9182SOmar Sandoval ret = -ENOMEM; 1366a5ed9182SOmar Sandoval goto out; 1367a5ed9182SOmar Sandoval } 1368a5ed9182SOmar Sandoval 1369b3470b5dSDavid Sterba start = block_group->start; 1370b3470b5dSDavid Sterba end = block_group->start + block_group->length; 1371a5ed9182SOmar Sandoval 1372a5ed9182SOmar Sandoval key.objectid = end - 1; 1373a5ed9182SOmar Sandoval key.type = (u8)-1; 1374a5ed9182SOmar Sandoval key.offset = (u64)-1; 1375a5ed9182SOmar Sandoval 1376a5ed9182SOmar Sandoval while (!done) { 1377a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 1378a5ed9182SOmar Sandoval if (ret) 1379a5ed9182SOmar Sandoval goto out; 1380a5ed9182SOmar Sandoval 1381a5ed9182SOmar Sandoval leaf = path->nodes[0]; 1382a5ed9182SOmar Sandoval nr = 0; 1383a5ed9182SOmar Sandoval path->slots[0]++; 1384a5ed9182SOmar Sandoval while (path->slots[0] > 0) { 1385a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0] - 1); 1386a5ed9182SOmar Sandoval 1387a5ed9182SOmar Sandoval if (found_key.type == BTRFS_FREE_SPACE_INFO_KEY) { 1388b3470b5dSDavid Sterba ASSERT(found_key.objectid == block_group->start); 1389b3470b5dSDavid Sterba ASSERT(found_key.offset == block_group->length); 1390a5ed9182SOmar Sandoval done = 1; 1391a5ed9182SOmar Sandoval nr++; 1392a5ed9182SOmar Sandoval path->slots[0]--; 1393a5ed9182SOmar Sandoval break; 1394a5ed9182SOmar Sandoval } else if (found_key.type == BTRFS_FREE_SPACE_EXTENT_KEY || 1395a5ed9182SOmar Sandoval found_key.type == BTRFS_FREE_SPACE_BITMAP_KEY) { 1396a5ed9182SOmar Sandoval ASSERT(found_key.objectid >= start); 1397a5ed9182SOmar Sandoval ASSERT(found_key.objectid < end); 1398a5ed9182SOmar Sandoval ASSERT(found_key.objectid + found_key.offset <= end); 1399a5ed9182SOmar Sandoval nr++; 1400a5ed9182SOmar Sandoval path->slots[0]--; 1401a5ed9182SOmar Sandoval } else { 1402a5ed9182SOmar Sandoval ASSERT(0); 1403a5ed9182SOmar Sandoval } 1404a5ed9182SOmar Sandoval } 1405a5ed9182SOmar Sandoval 1406a5ed9182SOmar Sandoval ret = btrfs_del_items(trans, root, path, path->slots[0], nr); 1407a5ed9182SOmar Sandoval if (ret) 1408a5ed9182SOmar Sandoval goto out; 1409a5ed9182SOmar Sandoval btrfs_release_path(path); 1410a5ed9182SOmar Sandoval } 1411a5ed9182SOmar Sandoval 1412a5ed9182SOmar Sandoval ret = 0; 1413a5ed9182SOmar Sandoval out: 1414a5ed9182SOmar Sandoval btrfs_free_path(path); 1415a5ed9182SOmar Sandoval if (ret) 141666642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 1417a5ed9182SOmar Sandoval return ret; 1418a5ed9182SOmar Sandoval } 1419a5ed9182SOmar Sandoval 1420a5ed9182SOmar Sandoval static int load_free_space_bitmaps(struct btrfs_caching_control *caching_ctl, 1421a5ed9182SOmar Sandoval struct btrfs_path *path, 1422a5ed9182SOmar Sandoval u32 expected_extent_count) 1423a5ed9182SOmar Sandoval { 142432da5386SDavid Sterba struct btrfs_block_group *block_group; 1425a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info; 1426a5ed9182SOmar Sandoval struct btrfs_root *root; 1427a5ed9182SOmar Sandoval struct btrfs_key key; 1428a5ed9182SOmar Sandoval int prev_bit = 0, bit; 1429a5ed9182SOmar Sandoval /* Initialize to silence GCC. */ 1430a5ed9182SOmar Sandoval u64 extent_start = 0; 1431a5ed9182SOmar Sandoval u64 end, offset; 1432a5ed9182SOmar Sandoval u64 total_found = 0; 1433a5ed9182SOmar Sandoval u32 extent_count = 0; 1434a5ed9182SOmar Sandoval int ret; 1435a5ed9182SOmar Sandoval 1436a5ed9182SOmar Sandoval block_group = caching_ctl->block_group; 1437a5ed9182SOmar Sandoval fs_info = block_group->fs_info; 14387939dd9fSJosef Bacik root = btrfs_free_space_root(block_group); 1439a5ed9182SOmar Sandoval 1440b3470b5dSDavid Sterba end = block_group->start + block_group->length; 1441a5ed9182SOmar Sandoval 1442a5ed9182SOmar Sandoval while (1) { 1443a5ed9182SOmar Sandoval ret = btrfs_next_item(root, path); 1444a5ed9182SOmar Sandoval if (ret < 0) 1445a5ed9182SOmar Sandoval goto out; 1446a5ed9182SOmar Sandoval if (ret) 1447a5ed9182SOmar Sandoval break; 1448a5ed9182SOmar Sandoval 1449a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 1450a5ed9182SOmar Sandoval 1451a5ed9182SOmar Sandoval if (key.type == BTRFS_FREE_SPACE_INFO_KEY) 1452a5ed9182SOmar Sandoval break; 1453a5ed9182SOmar Sandoval 1454a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_BITMAP_KEY); 1455a5ed9182SOmar Sandoval ASSERT(key.objectid < end && key.objectid + key.offset <= end); 1456a5ed9182SOmar Sandoval 1457a5ed9182SOmar Sandoval offset = key.objectid; 1458a5ed9182SOmar Sandoval while (offset < key.objectid + key.offset) { 1459a5ed9182SOmar Sandoval bit = free_space_test_bit(block_group, path, offset); 1460a5ed9182SOmar Sandoval if (prev_bit == 0 && bit == 1) { 1461a5ed9182SOmar Sandoval extent_start = offset; 1462a5ed9182SOmar Sandoval } else if (prev_bit == 1 && bit == 0) { 1463a5ed9182SOmar Sandoval total_found += add_new_free_space(block_group, 1464a5ed9182SOmar Sandoval extent_start, 1465a5ed9182SOmar Sandoval offset); 1466a5ed9182SOmar Sandoval if (total_found > CACHING_CTL_WAKE_UP) { 1467a5ed9182SOmar Sandoval total_found = 0; 1468a5ed9182SOmar Sandoval wake_up(&caching_ctl->wait); 1469a5ed9182SOmar Sandoval } 1470a5ed9182SOmar Sandoval extent_count++; 1471a5ed9182SOmar Sandoval } 1472a5ed9182SOmar Sandoval prev_bit = bit; 14730b246afaSJeff Mahoney offset += fs_info->sectorsize; 1474a5ed9182SOmar Sandoval } 1475a5ed9182SOmar Sandoval } 1476a5ed9182SOmar Sandoval if (prev_bit == 1) { 14774457c1c7SNikolay Borisov total_found += add_new_free_space(block_group, extent_start, 14784457c1c7SNikolay Borisov end); 1479a5ed9182SOmar Sandoval extent_count++; 1480a5ed9182SOmar Sandoval } 1481a5ed9182SOmar Sandoval 1482a5ed9182SOmar Sandoval if (extent_count != expected_extent_count) { 14835d163e0eSJeff Mahoney btrfs_err(fs_info, 14845d163e0eSJeff Mahoney "incorrect extent count for %llu; counted %u, expected %u", 1485b3470b5dSDavid Sterba block_group->start, extent_count, 1486a5ed9182SOmar Sandoval expected_extent_count); 1487a5ed9182SOmar Sandoval ASSERT(0); 1488a5ed9182SOmar Sandoval ret = -EIO; 1489a5ed9182SOmar Sandoval goto out; 1490a5ed9182SOmar Sandoval } 1491a5ed9182SOmar Sandoval 1492a5ed9182SOmar Sandoval ret = 0; 1493a5ed9182SOmar Sandoval out: 1494a5ed9182SOmar Sandoval return ret; 1495a5ed9182SOmar Sandoval } 1496a5ed9182SOmar Sandoval 1497a5ed9182SOmar Sandoval static int load_free_space_extents(struct btrfs_caching_control *caching_ctl, 1498a5ed9182SOmar Sandoval struct btrfs_path *path, 1499a5ed9182SOmar Sandoval u32 expected_extent_count) 1500a5ed9182SOmar Sandoval { 150132da5386SDavid Sterba struct btrfs_block_group *block_group; 1502a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info; 1503a5ed9182SOmar Sandoval struct btrfs_root *root; 1504a5ed9182SOmar Sandoval struct btrfs_key key; 1505a5ed9182SOmar Sandoval u64 end; 1506a5ed9182SOmar Sandoval u64 total_found = 0; 1507a5ed9182SOmar Sandoval u32 extent_count = 0; 1508a5ed9182SOmar Sandoval int ret; 1509a5ed9182SOmar Sandoval 1510a5ed9182SOmar Sandoval block_group = caching_ctl->block_group; 1511a5ed9182SOmar Sandoval fs_info = block_group->fs_info; 15127939dd9fSJosef Bacik root = btrfs_free_space_root(block_group); 1513a5ed9182SOmar Sandoval 1514b3470b5dSDavid Sterba end = block_group->start + block_group->length; 1515a5ed9182SOmar Sandoval 1516a5ed9182SOmar Sandoval while (1) { 1517a5ed9182SOmar Sandoval ret = btrfs_next_item(root, path); 1518a5ed9182SOmar Sandoval if (ret < 0) 1519a5ed9182SOmar Sandoval goto out; 1520a5ed9182SOmar Sandoval if (ret) 1521a5ed9182SOmar Sandoval break; 1522a5ed9182SOmar Sandoval 1523a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 1524a5ed9182SOmar Sandoval 1525a5ed9182SOmar Sandoval if (key.type == BTRFS_FREE_SPACE_INFO_KEY) 1526a5ed9182SOmar Sandoval break; 1527a5ed9182SOmar Sandoval 1528a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_EXTENT_KEY); 1529a5ed9182SOmar Sandoval ASSERT(key.objectid < end && key.objectid + key.offset <= end); 1530a5ed9182SOmar Sandoval 15314457c1c7SNikolay Borisov total_found += add_new_free_space(block_group, key.objectid, 1532a5ed9182SOmar Sandoval key.objectid + key.offset); 1533a5ed9182SOmar Sandoval if (total_found > CACHING_CTL_WAKE_UP) { 1534a5ed9182SOmar Sandoval total_found = 0; 1535a5ed9182SOmar Sandoval wake_up(&caching_ctl->wait); 1536a5ed9182SOmar Sandoval } 1537a5ed9182SOmar Sandoval extent_count++; 1538a5ed9182SOmar Sandoval } 1539a5ed9182SOmar Sandoval 1540a5ed9182SOmar Sandoval if (extent_count != expected_extent_count) { 15415d163e0eSJeff Mahoney btrfs_err(fs_info, 15425d163e0eSJeff Mahoney "incorrect extent count for %llu; counted %u, expected %u", 1543b3470b5dSDavid Sterba block_group->start, extent_count, 1544a5ed9182SOmar Sandoval expected_extent_count); 1545a5ed9182SOmar Sandoval ASSERT(0); 1546a5ed9182SOmar Sandoval ret = -EIO; 1547a5ed9182SOmar Sandoval goto out; 1548a5ed9182SOmar Sandoval } 1549a5ed9182SOmar Sandoval 1550a5ed9182SOmar Sandoval ret = 0; 1551a5ed9182SOmar Sandoval out: 1552a5ed9182SOmar Sandoval return ret; 1553a5ed9182SOmar Sandoval } 1554a5ed9182SOmar Sandoval 1555a5ed9182SOmar Sandoval int load_free_space_tree(struct btrfs_caching_control *caching_ctl) 1556a5ed9182SOmar Sandoval { 155732da5386SDavid Sterba struct btrfs_block_group *block_group; 1558a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 1559a5ed9182SOmar Sandoval struct btrfs_path *path; 1560a5ed9182SOmar Sandoval u32 extent_count, flags; 1561a5ed9182SOmar Sandoval int ret; 1562a5ed9182SOmar Sandoval 1563a5ed9182SOmar Sandoval block_group = caching_ctl->block_group; 1564a5ed9182SOmar Sandoval 1565a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1566a5ed9182SOmar Sandoval if (!path) 1567a5ed9182SOmar Sandoval return -ENOMEM; 1568a5ed9182SOmar Sandoval 1569a5ed9182SOmar Sandoval /* 1570a5ed9182SOmar Sandoval * Just like caching_thread() doesn't want to deadlock on the extent 1571a5ed9182SOmar Sandoval * tree, we don't want to deadlock on the free space tree. 1572a5ed9182SOmar Sandoval */ 1573a5ed9182SOmar Sandoval path->skip_locking = 1; 1574a5ed9182SOmar Sandoval path->search_commit_root = 1; 15757ce311d5SGu JinXiang path->reada = READA_FORWARD; 1576a5ed9182SOmar Sandoval 15772ccf545eSDavid Sterba info = search_free_space_info(NULL, block_group, path, 0); 1578a5ed9182SOmar Sandoval if (IS_ERR(info)) { 1579a5ed9182SOmar Sandoval ret = PTR_ERR(info); 1580a5ed9182SOmar Sandoval goto out; 1581a5ed9182SOmar Sandoval } 1582a5ed9182SOmar Sandoval extent_count = btrfs_free_space_extent_count(path->nodes[0], info); 1583a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(path->nodes[0], info); 1584a5ed9182SOmar Sandoval 1585a5ed9182SOmar Sandoval /* 1586a5ed9182SOmar Sandoval * We left path pointing to the free space info item, so now 1587a5ed9182SOmar Sandoval * load_free_space_foo can just iterate through the free space tree from 1588a5ed9182SOmar Sandoval * there. 1589a5ed9182SOmar Sandoval */ 1590a5ed9182SOmar Sandoval if (flags & BTRFS_FREE_SPACE_USING_BITMAPS) 1591a5ed9182SOmar Sandoval ret = load_free_space_bitmaps(caching_ctl, path, extent_count); 1592a5ed9182SOmar Sandoval else 1593a5ed9182SOmar Sandoval ret = load_free_space_extents(caching_ctl, path, extent_count); 1594a5ed9182SOmar Sandoval 1595a5ed9182SOmar Sandoval out: 1596a5ed9182SOmar Sandoval btrfs_free_path(path); 1597a5ed9182SOmar Sandoval return ret; 1598a5ed9182SOmar Sandoval } 1599