1c1d7c514SDavid Sterba // SPDX-License-Identifier: GPL-2.0 2a5ed9182SOmar Sandoval /* 3a5ed9182SOmar Sandoval * Copyright (C) 2015 Facebook. All rights reserved. 4a5ed9182SOmar Sandoval */ 5a5ed9182SOmar Sandoval 6a5ed9182SOmar Sandoval #include <linux/kernel.h> 725ff17e8SOmar Sandoval #include <linux/sched/mm.h> 8a5ed9182SOmar Sandoval #include "ctree.h" 9a5ed9182SOmar Sandoval #include "disk-io.h" 10a5ed9182SOmar Sandoval #include "locking.h" 11a5ed9182SOmar Sandoval #include "free-space-tree.h" 12a5ed9182SOmar Sandoval #include "transaction.h" 13aac0023cSJosef Bacik #include "block-group.h" 14a5ed9182SOmar Sandoval 15a5ed9182SOmar Sandoval static int __add_block_group_free_space(struct btrfs_trans_handle *trans, 1632da5386SDavid Sterba struct btrfs_block_group *block_group, 17a5ed9182SOmar Sandoval struct btrfs_path *path); 18a5ed9182SOmar Sandoval 1932da5386SDavid Sterba void set_free_space_tree_thresholds(struct btrfs_block_group *cache) 20a5ed9182SOmar Sandoval { 21a5ed9182SOmar Sandoval u32 bitmap_range; 22a5ed9182SOmar Sandoval size_t bitmap_size; 23a5ed9182SOmar Sandoval u64 num_bitmaps, total_bitmap_size; 24a5ed9182SOmar Sandoval 25e3e39c72SMarcos Paulo de Souza if (WARN_ON(cache->length == 0)) 26e3e39c72SMarcos Paulo de Souza btrfs_warn(cache->fs_info, "block group %llu length is zero", 27e3e39c72SMarcos Paulo de Souza cache->start); 28e3e39c72SMarcos Paulo de Souza 29a5ed9182SOmar Sandoval /* 30a5ed9182SOmar Sandoval * We convert to bitmaps when the disk space required for using extents 31a5ed9182SOmar Sandoval * exceeds that required for using bitmaps. 32a5ed9182SOmar Sandoval */ 33da17066cSJeff Mahoney bitmap_range = cache->fs_info->sectorsize * BTRFS_FREE_SPACE_BITMAP_BITS; 34b3470b5dSDavid Sterba num_bitmaps = div_u64(cache->length + bitmap_range - 1, bitmap_range); 35a5ed9182SOmar Sandoval bitmap_size = sizeof(struct btrfs_item) + BTRFS_FREE_SPACE_BITMAP_SIZE; 36a5ed9182SOmar Sandoval total_bitmap_size = num_bitmaps * bitmap_size; 37a5ed9182SOmar Sandoval cache->bitmap_high_thresh = div_u64(total_bitmap_size, 38a5ed9182SOmar Sandoval sizeof(struct btrfs_item)); 39a5ed9182SOmar Sandoval 40a5ed9182SOmar Sandoval /* 41a5ed9182SOmar Sandoval * We allow for a small buffer between the high threshold and low 42a5ed9182SOmar Sandoval * threshold to avoid thrashing back and forth between the two formats. 43a5ed9182SOmar Sandoval */ 44a5ed9182SOmar Sandoval if (cache->bitmap_high_thresh > 100) 45a5ed9182SOmar Sandoval cache->bitmap_low_thresh = cache->bitmap_high_thresh - 100; 46a5ed9182SOmar Sandoval else 47a5ed9182SOmar Sandoval cache->bitmap_low_thresh = 0; 48a5ed9182SOmar Sandoval } 49a5ed9182SOmar Sandoval 50a5ed9182SOmar Sandoval static int add_new_free_space_info(struct btrfs_trans_handle *trans, 5132da5386SDavid Sterba struct btrfs_block_group *block_group, 52a5ed9182SOmar Sandoval struct btrfs_path *path) 53a5ed9182SOmar Sandoval { 5466afee18SNikolay Borisov struct btrfs_root *root = trans->fs_info->free_space_root; 55a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 56a5ed9182SOmar Sandoval struct btrfs_key key; 57a5ed9182SOmar Sandoval struct extent_buffer *leaf; 58a5ed9182SOmar Sandoval int ret; 59a5ed9182SOmar Sandoval 60b3470b5dSDavid Sterba key.objectid = block_group->start; 61a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_INFO_KEY; 62b3470b5dSDavid Sterba key.offset = block_group->length; 63a5ed9182SOmar Sandoval 64a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(*info)); 65a5ed9182SOmar Sandoval if (ret) 66a5ed9182SOmar Sandoval goto out; 67a5ed9182SOmar Sandoval 68a5ed9182SOmar Sandoval leaf = path->nodes[0]; 69a5ed9182SOmar Sandoval info = btrfs_item_ptr(leaf, path->slots[0], 70a5ed9182SOmar Sandoval struct btrfs_free_space_info); 71a5ed9182SOmar Sandoval btrfs_set_free_space_extent_count(leaf, info, 0); 72a5ed9182SOmar Sandoval btrfs_set_free_space_flags(leaf, info, 0); 73a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 74a5ed9182SOmar Sandoval 75a5ed9182SOmar Sandoval ret = 0; 76a5ed9182SOmar Sandoval out: 77a5ed9182SOmar Sandoval btrfs_release_path(path); 78a5ed9182SOmar Sandoval return ret; 79a5ed9182SOmar Sandoval } 80a5ed9182SOmar Sandoval 81ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 82ce9f967fSJohannes Thumshirn struct btrfs_free_space_info *search_free_space_info( 832ccf545eSDavid Sterba struct btrfs_trans_handle *trans, 8432da5386SDavid Sterba struct btrfs_block_group *block_group, 85a5ed9182SOmar Sandoval struct btrfs_path *path, int cow) 86a5ed9182SOmar Sandoval { 872ccf545eSDavid Sterba struct btrfs_fs_info *fs_info = block_group->fs_info; 88a5ed9182SOmar Sandoval struct btrfs_root *root = fs_info->free_space_root; 89a5ed9182SOmar Sandoval struct btrfs_key key; 90a5ed9182SOmar Sandoval int ret; 91a5ed9182SOmar Sandoval 92b3470b5dSDavid Sterba key.objectid = block_group->start; 93a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_INFO_KEY; 94b3470b5dSDavid Sterba key.offset = block_group->length; 95a5ed9182SOmar Sandoval 96a5ed9182SOmar Sandoval ret = btrfs_search_slot(trans, root, &key, path, 0, cow); 97a5ed9182SOmar Sandoval if (ret < 0) 98a5ed9182SOmar Sandoval return ERR_PTR(ret); 99a5ed9182SOmar Sandoval if (ret != 0) { 100ab8d0fc4SJeff Mahoney btrfs_warn(fs_info, "missing free space info for %llu", 101b3470b5dSDavid Sterba block_group->start); 102a5ed9182SOmar Sandoval ASSERT(0); 103a5ed9182SOmar Sandoval return ERR_PTR(-ENOENT); 104a5ed9182SOmar Sandoval } 105a5ed9182SOmar Sandoval 106a5ed9182SOmar Sandoval return btrfs_item_ptr(path->nodes[0], path->slots[0], 107a5ed9182SOmar Sandoval struct btrfs_free_space_info); 108a5ed9182SOmar Sandoval } 109a5ed9182SOmar Sandoval 110a5ed9182SOmar Sandoval /* 111a5ed9182SOmar Sandoval * btrfs_search_slot() but we're looking for the greatest key less than the 112a5ed9182SOmar Sandoval * passed key. 113a5ed9182SOmar Sandoval */ 114a5ed9182SOmar Sandoval static int btrfs_search_prev_slot(struct btrfs_trans_handle *trans, 115a5ed9182SOmar Sandoval struct btrfs_root *root, 116a5ed9182SOmar Sandoval struct btrfs_key *key, struct btrfs_path *p, 117a5ed9182SOmar Sandoval int ins_len, int cow) 118a5ed9182SOmar Sandoval { 119a5ed9182SOmar Sandoval int ret; 120a5ed9182SOmar Sandoval 121a5ed9182SOmar Sandoval ret = btrfs_search_slot(trans, root, key, p, ins_len, cow); 122a5ed9182SOmar Sandoval if (ret < 0) 123a5ed9182SOmar Sandoval return ret; 124a5ed9182SOmar Sandoval 125a5ed9182SOmar Sandoval if (ret == 0) { 126a5ed9182SOmar Sandoval ASSERT(0); 127a5ed9182SOmar Sandoval return -EIO; 128a5ed9182SOmar Sandoval } 129a5ed9182SOmar Sandoval 130a5ed9182SOmar Sandoval if (p->slots[0] == 0) { 131a5ed9182SOmar Sandoval ASSERT(0); 132a5ed9182SOmar Sandoval return -EIO; 133a5ed9182SOmar Sandoval } 134a5ed9182SOmar Sandoval p->slots[0]--; 135a5ed9182SOmar Sandoval 136a5ed9182SOmar Sandoval return 0; 137a5ed9182SOmar Sandoval } 138a5ed9182SOmar Sandoval 139098e6308SDavid Sterba static inline u32 free_space_bitmap_size(const struct btrfs_fs_info *fs_info, 140098e6308SDavid Sterba u64 size) 141a5ed9182SOmar Sandoval { 142098e6308SDavid Sterba return DIV_ROUND_UP(size >> fs_info->sectorsize_bits, BITS_PER_BYTE); 143a5ed9182SOmar Sandoval } 144a5ed9182SOmar Sandoval 145a565971fSHoward McLauchlan static unsigned long *alloc_bitmap(u32 bitmap_size) 146a5ed9182SOmar Sandoval { 147a565971fSHoward McLauchlan unsigned long *ret; 14825ff17e8SOmar Sandoval unsigned int nofs_flag; 149a565971fSHoward McLauchlan u32 bitmap_rounded_size = round_up(bitmap_size, sizeof(unsigned long)); 15079b134a2SDavid Sterba 15179b134a2SDavid Sterba /* 15225ff17e8SOmar Sandoval * GFP_NOFS doesn't work with kvmalloc(), but we really can't recurse 15325ff17e8SOmar Sandoval * into the filesystem as the free space bitmap can be modified in the 15425ff17e8SOmar Sandoval * critical section of a transaction commit. 15525ff17e8SOmar Sandoval * 15625ff17e8SOmar Sandoval * TODO: push the memalloc_nofs_{save,restore}() to the caller where we 15725ff17e8SOmar Sandoval * know that recursion is unsafe. 15879b134a2SDavid Sterba */ 15925ff17e8SOmar Sandoval nofs_flag = memalloc_nofs_save(); 160a565971fSHoward McLauchlan ret = kvzalloc(bitmap_rounded_size, GFP_KERNEL); 16125ff17e8SOmar Sandoval memalloc_nofs_restore(nofs_flag); 16225ff17e8SOmar Sandoval return ret; 163a5ed9182SOmar Sandoval } 164a5ed9182SOmar Sandoval 165a565971fSHoward McLauchlan static void le_bitmap_set(unsigned long *map, unsigned int start, int len) 1666faa8f47SHoward McLauchlan { 167a565971fSHoward McLauchlan u8 *p = ((u8 *)map) + BIT_BYTE(start); 1686faa8f47SHoward McLauchlan const unsigned int size = start + len; 1696faa8f47SHoward McLauchlan int bits_to_set = BITS_PER_BYTE - (start % BITS_PER_BYTE); 1706faa8f47SHoward McLauchlan u8 mask_to_set = BITMAP_FIRST_BYTE_MASK(start); 1716faa8f47SHoward McLauchlan 1726faa8f47SHoward McLauchlan while (len - bits_to_set >= 0) { 1736faa8f47SHoward McLauchlan *p |= mask_to_set; 1746faa8f47SHoward McLauchlan len -= bits_to_set; 1756faa8f47SHoward McLauchlan bits_to_set = BITS_PER_BYTE; 1766faa8f47SHoward McLauchlan mask_to_set = ~0; 1776faa8f47SHoward McLauchlan p++; 1786faa8f47SHoward McLauchlan } 1796faa8f47SHoward McLauchlan if (len) { 1806faa8f47SHoward McLauchlan mask_to_set &= BITMAP_LAST_BYTE_MASK(size); 1816faa8f47SHoward McLauchlan *p |= mask_to_set; 1826faa8f47SHoward McLauchlan } 1836faa8f47SHoward McLauchlan } 1846faa8f47SHoward McLauchlan 185ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 186a5ed9182SOmar Sandoval int convert_free_space_to_bitmaps(struct btrfs_trans_handle *trans, 18732da5386SDavid Sterba struct btrfs_block_group *block_group, 188a5ed9182SOmar Sandoval struct btrfs_path *path) 189a5ed9182SOmar Sandoval { 190719fb4deSNikolay Borisov struct btrfs_fs_info *fs_info = trans->fs_info; 191a5ed9182SOmar Sandoval struct btrfs_root *root = fs_info->free_space_root; 192a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 193a5ed9182SOmar Sandoval struct btrfs_key key, found_key; 194a5ed9182SOmar Sandoval struct extent_buffer *leaf; 195a565971fSHoward McLauchlan unsigned long *bitmap; 196a565971fSHoward McLauchlan char *bitmap_cursor; 197a5ed9182SOmar Sandoval u64 start, end; 198a5ed9182SOmar Sandoval u64 bitmap_range, i; 199a5ed9182SOmar Sandoval u32 bitmap_size, flags, expected_extent_count; 200a5ed9182SOmar Sandoval u32 extent_count = 0; 201a5ed9182SOmar Sandoval int done = 0, nr; 202a5ed9182SOmar Sandoval int ret; 203a5ed9182SOmar Sandoval 204098e6308SDavid Sterba bitmap_size = free_space_bitmap_size(fs_info, block_group->length); 205a5ed9182SOmar Sandoval bitmap = alloc_bitmap(bitmap_size); 206a5ed9182SOmar Sandoval if (!bitmap) { 207a5ed9182SOmar Sandoval ret = -ENOMEM; 208a5ed9182SOmar Sandoval goto out; 209a5ed9182SOmar Sandoval } 210a5ed9182SOmar Sandoval 211b3470b5dSDavid Sterba start = block_group->start; 212b3470b5dSDavid Sterba end = block_group->start + block_group->length; 213a5ed9182SOmar Sandoval 214a5ed9182SOmar Sandoval key.objectid = end - 1; 215a5ed9182SOmar Sandoval key.type = (u8)-1; 216a5ed9182SOmar Sandoval key.offset = (u64)-1; 217a5ed9182SOmar Sandoval 218a5ed9182SOmar Sandoval while (!done) { 219a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 220a5ed9182SOmar Sandoval if (ret) 221a5ed9182SOmar Sandoval goto out; 222a5ed9182SOmar Sandoval 223a5ed9182SOmar Sandoval leaf = path->nodes[0]; 224a5ed9182SOmar Sandoval nr = 0; 225a5ed9182SOmar Sandoval path->slots[0]++; 226a5ed9182SOmar Sandoval while (path->slots[0] > 0) { 227a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0] - 1); 228a5ed9182SOmar Sandoval 229a5ed9182SOmar Sandoval if (found_key.type == BTRFS_FREE_SPACE_INFO_KEY) { 230b3470b5dSDavid Sterba ASSERT(found_key.objectid == block_group->start); 231b3470b5dSDavid Sterba ASSERT(found_key.offset == block_group->length); 232a5ed9182SOmar Sandoval done = 1; 233a5ed9182SOmar Sandoval break; 234a5ed9182SOmar Sandoval } else if (found_key.type == BTRFS_FREE_SPACE_EXTENT_KEY) { 235a5ed9182SOmar Sandoval u64 first, last; 236a5ed9182SOmar Sandoval 237a5ed9182SOmar Sandoval ASSERT(found_key.objectid >= start); 238a5ed9182SOmar Sandoval ASSERT(found_key.objectid < end); 239a5ed9182SOmar Sandoval ASSERT(found_key.objectid + found_key.offset <= end); 240a5ed9182SOmar Sandoval 241a5ed9182SOmar Sandoval first = div_u64(found_key.objectid - start, 2420b246afaSJeff Mahoney fs_info->sectorsize); 243a5ed9182SOmar Sandoval last = div_u64(found_key.objectid + found_key.offset - start, 2440b246afaSJeff Mahoney fs_info->sectorsize); 2452fe1d551SOmar Sandoval le_bitmap_set(bitmap, first, last - first); 246a5ed9182SOmar Sandoval 247a5ed9182SOmar Sandoval extent_count++; 248a5ed9182SOmar Sandoval nr++; 249a5ed9182SOmar Sandoval path->slots[0]--; 250a5ed9182SOmar Sandoval } else { 251a5ed9182SOmar Sandoval ASSERT(0); 252a5ed9182SOmar Sandoval } 253a5ed9182SOmar Sandoval } 254a5ed9182SOmar Sandoval 255a5ed9182SOmar Sandoval ret = btrfs_del_items(trans, root, path, path->slots[0], nr); 256a5ed9182SOmar Sandoval if (ret) 257a5ed9182SOmar Sandoval goto out; 258a5ed9182SOmar Sandoval btrfs_release_path(path); 259a5ed9182SOmar Sandoval } 260a5ed9182SOmar Sandoval 2612ccf545eSDavid Sterba info = search_free_space_info(trans, block_group, path, 1); 262a5ed9182SOmar Sandoval if (IS_ERR(info)) { 263a5ed9182SOmar Sandoval ret = PTR_ERR(info); 264a5ed9182SOmar Sandoval goto out; 265a5ed9182SOmar Sandoval } 266a5ed9182SOmar Sandoval leaf = path->nodes[0]; 267a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(leaf, info); 268a5ed9182SOmar Sandoval flags |= BTRFS_FREE_SPACE_USING_BITMAPS; 269a5ed9182SOmar Sandoval btrfs_set_free_space_flags(leaf, info, flags); 270a5ed9182SOmar Sandoval expected_extent_count = btrfs_free_space_extent_count(leaf, info); 271a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 272a5ed9182SOmar Sandoval btrfs_release_path(path); 273a5ed9182SOmar Sandoval 274a5ed9182SOmar Sandoval if (extent_count != expected_extent_count) { 2755d163e0eSJeff Mahoney btrfs_err(fs_info, 2765d163e0eSJeff Mahoney "incorrect extent count for %llu; counted %u, expected %u", 277b3470b5dSDavid Sterba block_group->start, extent_count, 278a5ed9182SOmar Sandoval expected_extent_count); 279a5ed9182SOmar Sandoval ASSERT(0); 280a5ed9182SOmar Sandoval ret = -EIO; 281a5ed9182SOmar Sandoval goto out; 282a5ed9182SOmar Sandoval } 283a5ed9182SOmar Sandoval 284a565971fSHoward McLauchlan bitmap_cursor = (char *)bitmap; 2850b246afaSJeff Mahoney bitmap_range = fs_info->sectorsize * BTRFS_FREE_SPACE_BITMAP_BITS; 286a5ed9182SOmar Sandoval i = start; 287a5ed9182SOmar Sandoval while (i < end) { 288a5ed9182SOmar Sandoval unsigned long ptr; 289a5ed9182SOmar Sandoval u64 extent_size; 290a5ed9182SOmar Sandoval u32 data_size; 291a5ed9182SOmar Sandoval 292a5ed9182SOmar Sandoval extent_size = min(end - i, bitmap_range); 293098e6308SDavid Sterba data_size = free_space_bitmap_size(fs_info, extent_size); 294a5ed9182SOmar Sandoval 295a5ed9182SOmar Sandoval key.objectid = i; 296a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_BITMAP_KEY; 297a5ed9182SOmar Sandoval key.offset = extent_size; 298a5ed9182SOmar Sandoval 299a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, 300a5ed9182SOmar Sandoval data_size); 301a5ed9182SOmar Sandoval if (ret) 302a5ed9182SOmar Sandoval goto out; 303a5ed9182SOmar Sandoval 304a5ed9182SOmar Sandoval leaf = path->nodes[0]; 305a5ed9182SOmar Sandoval ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); 306a5ed9182SOmar Sandoval write_extent_buffer(leaf, bitmap_cursor, ptr, 307a5ed9182SOmar Sandoval data_size); 308a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 309a5ed9182SOmar Sandoval btrfs_release_path(path); 310a5ed9182SOmar Sandoval 311a5ed9182SOmar Sandoval i += extent_size; 312a5ed9182SOmar Sandoval bitmap_cursor += data_size; 313a5ed9182SOmar Sandoval } 314a5ed9182SOmar Sandoval 315a5ed9182SOmar Sandoval ret = 0; 316a5ed9182SOmar Sandoval out: 31779b134a2SDavid Sterba kvfree(bitmap); 318a5ed9182SOmar Sandoval if (ret) 31966642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 320a5ed9182SOmar Sandoval return ret; 321a5ed9182SOmar Sandoval } 322a5ed9182SOmar Sandoval 323ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 324a5ed9182SOmar Sandoval int convert_free_space_to_extents(struct btrfs_trans_handle *trans, 32532da5386SDavid Sterba struct btrfs_block_group *block_group, 326a5ed9182SOmar Sandoval struct btrfs_path *path) 327a5ed9182SOmar Sandoval { 3285296c2bfSNikolay Borisov struct btrfs_fs_info *fs_info = trans->fs_info; 329a5ed9182SOmar Sandoval struct btrfs_root *root = fs_info->free_space_root; 330a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 331a5ed9182SOmar Sandoval struct btrfs_key key, found_key; 332a5ed9182SOmar Sandoval struct extent_buffer *leaf; 333a565971fSHoward McLauchlan unsigned long *bitmap; 334a5ed9182SOmar Sandoval u64 start, end; 335a5ed9182SOmar Sandoval u32 bitmap_size, flags, expected_extent_count; 336a565971fSHoward McLauchlan unsigned long nrbits, start_bit, end_bit; 337a5ed9182SOmar Sandoval u32 extent_count = 0; 338a5ed9182SOmar Sandoval int done = 0, nr; 339a5ed9182SOmar Sandoval int ret; 340a5ed9182SOmar Sandoval 341098e6308SDavid Sterba bitmap_size = free_space_bitmap_size(fs_info, block_group->length); 342a5ed9182SOmar Sandoval bitmap = alloc_bitmap(bitmap_size); 343a5ed9182SOmar Sandoval if (!bitmap) { 344a5ed9182SOmar Sandoval ret = -ENOMEM; 345a5ed9182SOmar Sandoval goto out; 346a5ed9182SOmar Sandoval } 347a5ed9182SOmar Sandoval 348b3470b5dSDavid Sterba start = block_group->start; 349b3470b5dSDavid Sterba end = block_group->start + block_group->length; 350a5ed9182SOmar Sandoval 351a5ed9182SOmar Sandoval key.objectid = end - 1; 352a5ed9182SOmar Sandoval key.type = (u8)-1; 353a5ed9182SOmar Sandoval key.offset = (u64)-1; 354a5ed9182SOmar Sandoval 355a5ed9182SOmar Sandoval while (!done) { 356a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 357a5ed9182SOmar Sandoval if (ret) 358a5ed9182SOmar Sandoval goto out; 359a5ed9182SOmar Sandoval 360a5ed9182SOmar Sandoval leaf = path->nodes[0]; 361a5ed9182SOmar Sandoval nr = 0; 362a5ed9182SOmar Sandoval path->slots[0]++; 363a5ed9182SOmar Sandoval while (path->slots[0] > 0) { 364a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0] - 1); 365a5ed9182SOmar Sandoval 366a5ed9182SOmar Sandoval if (found_key.type == BTRFS_FREE_SPACE_INFO_KEY) { 367b3470b5dSDavid Sterba ASSERT(found_key.objectid == block_group->start); 368b3470b5dSDavid Sterba ASSERT(found_key.offset == block_group->length); 369a5ed9182SOmar Sandoval done = 1; 370a5ed9182SOmar Sandoval break; 371a5ed9182SOmar Sandoval } else if (found_key.type == BTRFS_FREE_SPACE_BITMAP_KEY) { 372a5ed9182SOmar Sandoval unsigned long ptr; 373a565971fSHoward McLauchlan char *bitmap_cursor; 374a5ed9182SOmar Sandoval u32 bitmap_pos, data_size; 375a5ed9182SOmar Sandoval 376a5ed9182SOmar Sandoval ASSERT(found_key.objectid >= start); 377a5ed9182SOmar Sandoval ASSERT(found_key.objectid < end); 378a5ed9182SOmar Sandoval ASSERT(found_key.objectid + found_key.offset <= end); 379a5ed9182SOmar Sandoval 380a5ed9182SOmar Sandoval bitmap_pos = div_u64(found_key.objectid - start, 3810b246afaSJeff Mahoney fs_info->sectorsize * 382a5ed9182SOmar Sandoval BITS_PER_BYTE); 383a565971fSHoward McLauchlan bitmap_cursor = ((char *)bitmap) + bitmap_pos; 384098e6308SDavid Sterba data_size = free_space_bitmap_size(fs_info, 385098e6308SDavid Sterba found_key.offset); 386a5ed9182SOmar Sandoval 387a5ed9182SOmar Sandoval ptr = btrfs_item_ptr_offset(leaf, path->slots[0] - 1); 388a5ed9182SOmar Sandoval read_extent_buffer(leaf, bitmap_cursor, ptr, 389a5ed9182SOmar Sandoval data_size); 390a5ed9182SOmar Sandoval 391a5ed9182SOmar Sandoval nr++; 392a5ed9182SOmar Sandoval path->slots[0]--; 393a5ed9182SOmar Sandoval } else { 394a5ed9182SOmar Sandoval ASSERT(0); 395a5ed9182SOmar Sandoval } 396a5ed9182SOmar Sandoval } 397a5ed9182SOmar Sandoval 398a5ed9182SOmar Sandoval ret = btrfs_del_items(trans, root, path, path->slots[0], nr); 399a5ed9182SOmar Sandoval if (ret) 400a5ed9182SOmar Sandoval goto out; 401a5ed9182SOmar Sandoval btrfs_release_path(path); 402a5ed9182SOmar Sandoval } 403a5ed9182SOmar Sandoval 4042ccf545eSDavid Sterba info = search_free_space_info(trans, block_group, path, 1); 405a5ed9182SOmar Sandoval if (IS_ERR(info)) { 406a5ed9182SOmar Sandoval ret = PTR_ERR(info); 407a5ed9182SOmar Sandoval goto out; 408a5ed9182SOmar Sandoval } 409a5ed9182SOmar Sandoval leaf = path->nodes[0]; 410a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(leaf, info); 411a5ed9182SOmar Sandoval flags &= ~BTRFS_FREE_SPACE_USING_BITMAPS; 412a5ed9182SOmar Sandoval btrfs_set_free_space_flags(leaf, info, flags); 413a5ed9182SOmar Sandoval expected_extent_count = btrfs_free_space_extent_count(leaf, info); 414a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 415a5ed9182SOmar Sandoval btrfs_release_path(path); 416a5ed9182SOmar Sandoval 417ab108d99SDavid Sterba nrbits = block_group->length >> block_group->fs_info->sectorsize_bits; 418a565971fSHoward McLauchlan start_bit = find_next_bit_le(bitmap, nrbits, 0); 419a565971fSHoward McLauchlan 420a565971fSHoward McLauchlan while (start_bit < nrbits) { 421a565971fSHoward McLauchlan end_bit = find_next_zero_bit_le(bitmap, nrbits, start_bit); 422a565971fSHoward McLauchlan ASSERT(start_bit < end_bit); 423a565971fSHoward McLauchlan 424a565971fSHoward McLauchlan key.objectid = start + start_bit * block_group->fs_info->sectorsize; 425a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_EXTENT_KEY; 426a565971fSHoward McLauchlan key.offset = (end_bit - start_bit) * block_group->fs_info->sectorsize; 427a5ed9182SOmar Sandoval 428a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, 0); 429a5ed9182SOmar Sandoval if (ret) 430a5ed9182SOmar Sandoval goto out; 431a5ed9182SOmar Sandoval btrfs_release_path(path); 432a5ed9182SOmar Sandoval 433a5ed9182SOmar Sandoval extent_count++; 434a5ed9182SOmar Sandoval 435a565971fSHoward McLauchlan start_bit = find_next_bit_le(bitmap, nrbits, end_bit); 436a5ed9182SOmar Sandoval } 437a5ed9182SOmar Sandoval 438a5ed9182SOmar Sandoval if (extent_count != expected_extent_count) { 4395d163e0eSJeff Mahoney btrfs_err(fs_info, 4405d163e0eSJeff Mahoney "incorrect extent count for %llu; counted %u, expected %u", 441b3470b5dSDavid Sterba block_group->start, extent_count, 442a5ed9182SOmar Sandoval expected_extent_count); 443a5ed9182SOmar Sandoval ASSERT(0); 444a5ed9182SOmar Sandoval ret = -EIO; 445a5ed9182SOmar Sandoval goto out; 446a5ed9182SOmar Sandoval } 447a5ed9182SOmar Sandoval 448a5ed9182SOmar Sandoval ret = 0; 449a5ed9182SOmar Sandoval out: 45079b134a2SDavid Sterba kvfree(bitmap); 451a5ed9182SOmar Sandoval if (ret) 45266642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 453a5ed9182SOmar Sandoval return ret; 454a5ed9182SOmar Sandoval } 455a5ed9182SOmar Sandoval 456a5ed9182SOmar Sandoval static int update_free_space_extent_count(struct btrfs_trans_handle *trans, 45732da5386SDavid Sterba struct btrfs_block_group *block_group, 458a5ed9182SOmar Sandoval struct btrfs_path *path, 459a5ed9182SOmar Sandoval int new_extents) 460a5ed9182SOmar Sandoval { 461a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 462a5ed9182SOmar Sandoval u32 flags; 463a5ed9182SOmar Sandoval u32 extent_count; 464a5ed9182SOmar Sandoval int ret = 0; 465a5ed9182SOmar Sandoval 466a5ed9182SOmar Sandoval if (new_extents == 0) 467a5ed9182SOmar Sandoval return 0; 468a5ed9182SOmar Sandoval 4692ccf545eSDavid Sterba info = search_free_space_info(trans, block_group, path, 1); 470a5ed9182SOmar Sandoval if (IS_ERR(info)) { 471a5ed9182SOmar Sandoval ret = PTR_ERR(info); 472a5ed9182SOmar Sandoval goto out; 473a5ed9182SOmar Sandoval } 474a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(path->nodes[0], info); 475a5ed9182SOmar Sandoval extent_count = btrfs_free_space_extent_count(path->nodes[0], info); 476a5ed9182SOmar Sandoval 477a5ed9182SOmar Sandoval extent_count += new_extents; 478a5ed9182SOmar Sandoval btrfs_set_free_space_extent_count(path->nodes[0], info, extent_count); 479a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(path->nodes[0]); 480a5ed9182SOmar Sandoval btrfs_release_path(path); 481a5ed9182SOmar Sandoval 482a5ed9182SOmar Sandoval if (!(flags & BTRFS_FREE_SPACE_USING_BITMAPS) && 483a5ed9182SOmar Sandoval extent_count > block_group->bitmap_high_thresh) { 484719fb4deSNikolay Borisov ret = convert_free_space_to_bitmaps(trans, block_group, path); 485a5ed9182SOmar Sandoval } else if ((flags & BTRFS_FREE_SPACE_USING_BITMAPS) && 486a5ed9182SOmar Sandoval extent_count < block_group->bitmap_low_thresh) { 4875296c2bfSNikolay Borisov ret = convert_free_space_to_extents(trans, block_group, path); 488a5ed9182SOmar Sandoval } 489a5ed9182SOmar Sandoval 490a5ed9182SOmar Sandoval out: 491a5ed9182SOmar Sandoval return ret; 492a5ed9182SOmar Sandoval } 493a5ed9182SOmar Sandoval 494ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 49532da5386SDavid Sterba int free_space_test_bit(struct btrfs_block_group *block_group, 496a5ed9182SOmar Sandoval struct btrfs_path *path, u64 offset) 497a5ed9182SOmar Sandoval { 498a5ed9182SOmar Sandoval struct extent_buffer *leaf; 499a5ed9182SOmar Sandoval struct btrfs_key key; 500a5ed9182SOmar Sandoval u64 found_start, found_end; 501a5ed9182SOmar Sandoval unsigned long ptr, i; 502a5ed9182SOmar Sandoval 503a5ed9182SOmar Sandoval leaf = path->nodes[0]; 504a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); 505a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_BITMAP_KEY); 506a5ed9182SOmar Sandoval 507a5ed9182SOmar Sandoval found_start = key.objectid; 508a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 509a5ed9182SOmar Sandoval ASSERT(offset >= found_start && offset < found_end); 510a5ed9182SOmar Sandoval 511a5ed9182SOmar Sandoval ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); 512da17066cSJeff Mahoney i = div_u64(offset - found_start, 513da17066cSJeff Mahoney block_group->fs_info->sectorsize); 514a5ed9182SOmar Sandoval return !!extent_buffer_test_bit(leaf, ptr, i); 515a5ed9182SOmar Sandoval } 516a5ed9182SOmar Sandoval 51732da5386SDavid Sterba static void free_space_set_bits(struct btrfs_block_group *block_group, 518a5ed9182SOmar Sandoval struct btrfs_path *path, u64 *start, u64 *size, 519a5ed9182SOmar Sandoval int bit) 520a5ed9182SOmar Sandoval { 5210b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = block_group->fs_info; 522a5ed9182SOmar Sandoval struct extent_buffer *leaf; 523a5ed9182SOmar Sandoval struct btrfs_key key; 524a5ed9182SOmar Sandoval u64 end = *start + *size; 525a5ed9182SOmar Sandoval u64 found_start, found_end; 526a5ed9182SOmar Sandoval unsigned long ptr, first, last; 527a5ed9182SOmar Sandoval 528a5ed9182SOmar Sandoval leaf = path->nodes[0]; 529a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); 530a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_BITMAP_KEY); 531a5ed9182SOmar Sandoval 532a5ed9182SOmar Sandoval found_start = key.objectid; 533a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 534a5ed9182SOmar Sandoval ASSERT(*start >= found_start && *start < found_end); 535a5ed9182SOmar Sandoval ASSERT(end > found_start); 536a5ed9182SOmar Sandoval 537a5ed9182SOmar Sandoval if (end > found_end) 538a5ed9182SOmar Sandoval end = found_end; 539a5ed9182SOmar Sandoval 540a5ed9182SOmar Sandoval ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); 541ab108d99SDavid Sterba first = (*start - found_start) >> fs_info->sectorsize_bits; 542ab108d99SDavid Sterba last = (end - found_start) >> fs_info->sectorsize_bits; 543a5ed9182SOmar Sandoval if (bit) 544a5ed9182SOmar Sandoval extent_buffer_bitmap_set(leaf, ptr, first, last - first); 545a5ed9182SOmar Sandoval else 546a5ed9182SOmar Sandoval extent_buffer_bitmap_clear(leaf, ptr, first, last - first); 547a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 548a5ed9182SOmar Sandoval 549a5ed9182SOmar Sandoval *size -= end - *start; 550a5ed9182SOmar Sandoval *start = end; 551a5ed9182SOmar Sandoval } 552a5ed9182SOmar Sandoval 553a5ed9182SOmar Sandoval /* 554a5ed9182SOmar Sandoval * We can't use btrfs_next_item() in modify_free_space_bitmap() because 555a5ed9182SOmar Sandoval * btrfs_next_leaf() doesn't get the path for writing. We can forgo the fancy 556a5ed9182SOmar Sandoval * tree walking in btrfs_next_leaf() anyways because we know exactly what we're 557a5ed9182SOmar Sandoval * looking for. 558a5ed9182SOmar Sandoval */ 559a5ed9182SOmar Sandoval static int free_space_next_bitmap(struct btrfs_trans_handle *trans, 560a5ed9182SOmar Sandoval struct btrfs_root *root, struct btrfs_path *p) 561a5ed9182SOmar Sandoval { 562a5ed9182SOmar Sandoval struct btrfs_key key; 563a5ed9182SOmar Sandoval 564a5ed9182SOmar Sandoval if (p->slots[0] + 1 < btrfs_header_nritems(p->nodes[0])) { 565a5ed9182SOmar Sandoval p->slots[0]++; 566a5ed9182SOmar Sandoval return 0; 567a5ed9182SOmar Sandoval } 568a5ed9182SOmar Sandoval 569a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(p->nodes[0], &key, p->slots[0]); 570a5ed9182SOmar Sandoval btrfs_release_path(p); 571a5ed9182SOmar Sandoval 572a5ed9182SOmar Sandoval key.objectid += key.offset; 573a5ed9182SOmar Sandoval key.type = (u8)-1; 574a5ed9182SOmar Sandoval key.offset = (u64)-1; 575a5ed9182SOmar Sandoval 576a5ed9182SOmar Sandoval return btrfs_search_prev_slot(trans, root, &key, p, 0, 1); 577a5ed9182SOmar Sandoval } 578a5ed9182SOmar Sandoval 579a5ed9182SOmar Sandoval /* 580a5ed9182SOmar Sandoval * If remove is 1, then we are removing free space, thus clearing bits in the 581a5ed9182SOmar Sandoval * bitmap. If remove is 0, then we are adding free space, thus setting bits in 582a5ed9182SOmar Sandoval * the bitmap. 583a5ed9182SOmar Sandoval */ 584a5ed9182SOmar Sandoval static int modify_free_space_bitmap(struct btrfs_trans_handle *trans, 58532da5386SDavid Sterba struct btrfs_block_group *block_group, 586a5ed9182SOmar Sandoval struct btrfs_path *path, 587a5ed9182SOmar Sandoval u64 start, u64 size, int remove) 588a5ed9182SOmar Sandoval { 58985a7ef13SNikolay Borisov struct btrfs_root *root = block_group->fs_info->free_space_root; 590a5ed9182SOmar Sandoval struct btrfs_key key; 591a5ed9182SOmar Sandoval u64 end = start + size; 592a5ed9182SOmar Sandoval u64 cur_start, cur_size; 593a5ed9182SOmar Sandoval int prev_bit, next_bit; 594a5ed9182SOmar Sandoval int new_extents; 595a5ed9182SOmar Sandoval int ret; 596a5ed9182SOmar Sandoval 597a5ed9182SOmar Sandoval /* 598a5ed9182SOmar Sandoval * Read the bit for the block immediately before the extent of space if 599a5ed9182SOmar Sandoval * that block is within the block group. 600a5ed9182SOmar Sandoval */ 601b3470b5dSDavid Sterba if (start > block_group->start) { 602da17066cSJeff Mahoney u64 prev_block = start - block_group->fs_info->sectorsize; 603a5ed9182SOmar Sandoval 604a5ed9182SOmar Sandoval key.objectid = prev_block; 605a5ed9182SOmar Sandoval key.type = (u8)-1; 606a5ed9182SOmar Sandoval key.offset = (u64)-1; 607a5ed9182SOmar Sandoval 608a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, 0, 1); 609a5ed9182SOmar Sandoval if (ret) 610a5ed9182SOmar Sandoval goto out; 611a5ed9182SOmar Sandoval 612a5ed9182SOmar Sandoval prev_bit = free_space_test_bit(block_group, path, prev_block); 613a5ed9182SOmar Sandoval 614a5ed9182SOmar Sandoval /* The previous block may have been in the previous bitmap. */ 615a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 616a5ed9182SOmar Sandoval if (start >= key.objectid + key.offset) { 617a5ed9182SOmar Sandoval ret = free_space_next_bitmap(trans, root, path); 618a5ed9182SOmar Sandoval if (ret) 619a5ed9182SOmar Sandoval goto out; 620a5ed9182SOmar Sandoval } 621a5ed9182SOmar Sandoval } else { 622a5ed9182SOmar Sandoval key.objectid = start; 623a5ed9182SOmar Sandoval key.type = (u8)-1; 624a5ed9182SOmar Sandoval key.offset = (u64)-1; 625a5ed9182SOmar Sandoval 626a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, 0, 1); 627a5ed9182SOmar Sandoval if (ret) 628a5ed9182SOmar Sandoval goto out; 629a5ed9182SOmar Sandoval 630a5ed9182SOmar Sandoval prev_bit = -1; 631a5ed9182SOmar Sandoval } 632a5ed9182SOmar Sandoval 633a5ed9182SOmar Sandoval /* 634a5ed9182SOmar Sandoval * Iterate over all of the bitmaps overlapped by the extent of space, 635a5ed9182SOmar Sandoval * clearing/setting bits as required. 636a5ed9182SOmar Sandoval */ 637a5ed9182SOmar Sandoval cur_start = start; 638a5ed9182SOmar Sandoval cur_size = size; 639a5ed9182SOmar Sandoval while (1) { 640a5ed9182SOmar Sandoval free_space_set_bits(block_group, path, &cur_start, &cur_size, 641a5ed9182SOmar Sandoval !remove); 642a5ed9182SOmar Sandoval if (cur_size == 0) 643a5ed9182SOmar Sandoval break; 644a5ed9182SOmar Sandoval ret = free_space_next_bitmap(trans, root, path); 645a5ed9182SOmar Sandoval if (ret) 646a5ed9182SOmar Sandoval goto out; 647a5ed9182SOmar Sandoval } 648a5ed9182SOmar Sandoval 649a5ed9182SOmar Sandoval /* 650a5ed9182SOmar Sandoval * Read the bit for the block immediately after the extent of space if 651a5ed9182SOmar Sandoval * that block is within the block group. 652a5ed9182SOmar Sandoval */ 653b3470b5dSDavid Sterba if (end < block_group->start + block_group->length) { 654a5ed9182SOmar Sandoval /* The next block may be in the next bitmap. */ 655a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 656a5ed9182SOmar Sandoval if (end >= key.objectid + key.offset) { 657a5ed9182SOmar Sandoval ret = free_space_next_bitmap(trans, root, path); 658a5ed9182SOmar Sandoval if (ret) 659a5ed9182SOmar Sandoval goto out; 660a5ed9182SOmar Sandoval } 661a5ed9182SOmar Sandoval 662a5ed9182SOmar Sandoval next_bit = free_space_test_bit(block_group, path, end); 663a5ed9182SOmar Sandoval } else { 664a5ed9182SOmar Sandoval next_bit = -1; 665a5ed9182SOmar Sandoval } 666a5ed9182SOmar Sandoval 667a5ed9182SOmar Sandoval if (remove) { 668a5ed9182SOmar Sandoval new_extents = -1; 669a5ed9182SOmar Sandoval if (prev_bit == 1) { 670a5ed9182SOmar Sandoval /* Leftover on the left. */ 671a5ed9182SOmar Sandoval new_extents++; 672a5ed9182SOmar Sandoval } 673a5ed9182SOmar Sandoval if (next_bit == 1) { 674a5ed9182SOmar Sandoval /* Leftover on the right. */ 675a5ed9182SOmar Sandoval new_extents++; 676a5ed9182SOmar Sandoval } 677a5ed9182SOmar Sandoval } else { 678a5ed9182SOmar Sandoval new_extents = 1; 679a5ed9182SOmar Sandoval if (prev_bit == 1) { 680a5ed9182SOmar Sandoval /* Merging with neighbor on the left. */ 681a5ed9182SOmar Sandoval new_extents--; 682a5ed9182SOmar Sandoval } 683a5ed9182SOmar Sandoval if (next_bit == 1) { 684a5ed9182SOmar Sandoval /* Merging with neighbor on the right. */ 685a5ed9182SOmar Sandoval new_extents--; 686a5ed9182SOmar Sandoval } 687a5ed9182SOmar Sandoval } 688a5ed9182SOmar Sandoval 689a5ed9182SOmar Sandoval btrfs_release_path(path); 690690d7682SNikolay Borisov ret = update_free_space_extent_count(trans, block_group, path, 691a5ed9182SOmar Sandoval new_extents); 692a5ed9182SOmar Sandoval 693a5ed9182SOmar Sandoval out: 694a5ed9182SOmar Sandoval return ret; 695a5ed9182SOmar Sandoval } 696a5ed9182SOmar Sandoval 697a5ed9182SOmar Sandoval static int remove_free_space_extent(struct btrfs_trans_handle *trans, 69832da5386SDavid Sterba struct btrfs_block_group *block_group, 699a5ed9182SOmar Sandoval struct btrfs_path *path, 700a5ed9182SOmar Sandoval u64 start, u64 size) 701a5ed9182SOmar Sandoval { 702e581168dSNikolay Borisov struct btrfs_root *root = trans->fs_info->free_space_root; 703a5ed9182SOmar Sandoval struct btrfs_key key; 704a5ed9182SOmar Sandoval u64 found_start, found_end; 705a5ed9182SOmar Sandoval u64 end = start + size; 706a5ed9182SOmar Sandoval int new_extents = -1; 707a5ed9182SOmar Sandoval int ret; 708a5ed9182SOmar Sandoval 709a5ed9182SOmar Sandoval key.objectid = start; 710a5ed9182SOmar Sandoval key.type = (u8)-1; 711a5ed9182SOmar Sandoval key.offset = (u64)-1; 712a5ed9182SOmar Sandoval 713a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 714a5ed9182SOmar Sandoval if (ret) 715a5ed9182SOmar Sandoval goto out; 716a5ed9182SOmar Sandoval 717a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 718a5ed9182SOmar Sandoval 719a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_EXTENT_KEY); 720a5ed9182SOmar Sandoval 721a5ed9182SOmar Sandoval found_start = key.objectid; 722a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 723a5ed9182SOmar Sandoval ASSERT(start >= found_start && end <= found_end); 724a5ed9182SOmar Sandoval 725a5ed9182SOmar Sandoval /* 726a5ed9182SOmar Sandoval * Okay, now that we've found the free space extent which contains the 727a5ed9182SOmar Sandoval * free space that we are removing, there are four cases: 728a5ed9182SOmar Sandoval * 729a5ed9182SOmar Sandoval * 1. We're using the whole extent: delete the key we found and 730a5ed9182SOmar Sandoval * decrement the free space extent count. 731a5ed9182SOmar Sandoval * 2. We are using part of the extent starting at the beginning: delete 732a5ed9182SOmar Sandoval * the key we found and insert a new key representing the leftover at 733a5ed9182SOmar Sandoval * the end. There is no net change in the number of extents. 734a5ed9182SOmar Sandoval * 3. We are using part of the extent ending at the end: delete the key 735a5ed9182SOmar Sandoval * we found and insert a new key representing the leftover at the 736a5ed9182SOmar Sandoval * beginning. There is no net change in the number of extents. 737a5ed9182SOmar Sandoval * 4. We are using part of the extent in the middle: delete the key we 738a5ed9182SOmar Sandoval * found and insert two new keys representing the leftovers on each 739a5ed9182SOmar Sandoval * side. Where we used to have one extent, we now have two, so increment 740a5ed9182SOmar Sandoval * the extent count. We may need to convert the block group to bitmaps 741a5ed9182SOmar Sandoval * as a result. 742a5ed9182SOmar Sandoval */ 743a5ed9182SOmar Sandoval 744a5ed9182SOmar Sandoval /* Delete the existing key (cases 1-4). */ 745a5ed9182SOmar Sandoval ret = btrfs_del_item(trans, root, path); 746a5ed9182SOmar Sandoval if (ret) 747a5ed9182SOmar Sandoval goto out; 748a5ed9182SOmar Sandoval 749a5ed9182SOmar Sandoval /* Add a key for leftovers at the beginning (cases 3 and 4). */ 750a5ed9182SOmar Sandoval if (start > found_start) { 751a5ed9182SOmar Sandoval key.objectid = found_start; 752a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_EXTENT_KEY; 753a5ed9182SOmar Sandoval key.offset = start - found_start; 754a5ed9182SOmar Sandoval 755a5ed9182SOmar Sandoval btrfs_release_path(path); 756a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, 0); 757a5ed9182SOmar Sandoval if (ret) 758a5ed9182SOmar Sandoval goto out; 759a5ed9182SOmar Sandoval new_extents++; 760a5ed9182SOmar Sandoval } 761a5ed9182SOmar Sandoval 762a5ed9182SOmar Sandoval /* Add a key for leftovers at the end (cases 2 and 4). */ 763a5ed9182SOmar Sandoval if (end < found_end) { 764a5ed9182SOmar Sandoval key.objectid = end; 765a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_EXTENT_KEY; 766a5ed9182SOmar Sandoval key.offset = found_end - end; 767a5ed9182SOmar Sandoval 768a5ed9182SOmar Sandoval btrfs_release_path(path); 769a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, 0); 770a5ed9182SOmar Sandoval if (ret) 771a5ed9182SOmar Sandoval goto out; 772a5ed9182SOmar Sandoval new_extents++; 773a5ed9182SOmar Sandoval } 774a5ed9182SOmar Sandoval 775a5ed9182SOmar Sandoval btrfs_release_path(path); 776690d7682SNikolay Borisov ret = update_free_space_extent_count(trans, block_group, path, 777a5ed9182SOmar Sandoval new_extents); 778a5ed9182SOmar Sandoval 779a5ed9182SOmar Sandoval out: 780a5ed9182SOmar Sandoval return ret; 781a5ed9182SOmar Sandoval } 782a5ed9182SOmar Sandoval 783ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 784a5ed9182SOmar Sandoval int __remove_from_free_space_tree(struct btrfs_trans_handle *trans, 78532da5386SDavid Sterba struct btrfs_block_group *block_group, 786a5ed9182SOmar Sandoval struct btrfs_path *path, u64 start, u64 size) 787a5ed9182SOmar Sandoval { 788a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 789a5ed9182SOmar Sandoval u32 flags; 790a5ed9182SOmar Sandoval int ret; 791a5ed9182SOmar Sandoval 792a5ed9182SOmar Sandoval if (block_group->needs_free_space) { 7939a7e0f92SNikolay Borisov ret = __add_block_group_free_space(trans, block_group, path); 794a5ed9182SOmar Sandoval if (ret) 795a5ed9182SOmar Sandoval return ret; 796a5ed9182SOmar Sandoval } 797a5ed9182SOmar Sandoval 7982ccf545eSDavid Sterba info = search_free_space_info(NULL, block_group, path, 0); 799a5ed9182SOmar Sandoval if (IS_ERR(info)) 800a5ed9182SOmar Sandoval return PTR_ERR(info); 801a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(path->nodes[0], info); 802a5ed9182SOmar Sandoval btrfs_release_path(path); 803a5ed9182SOmar Sandoval 804a5ed9182SOmar Sandoval if (flags & BTRFS_FREE_SPACE_USING_BITMAPS) { 80585a7ef13SNikolay Borisov return modify_free_space_bitmap(trans, block_group, path, 80685a7ef13SNikolay Borisov start, size, 1); 807a5ed9182SOmar Sandoval } else { 808e581168dSNikolay Borisov return remove_free_space_extent(trans, block_group, path, 809e581168dSNikolay Borisov start, size); 810a5ed9182SOmar Sandoval } 811a5ed9182SOmar Sandoval } 812a5ed9182SOmar Sandoval 813a5ed9182SOmar Sandoval int remove_from_free_space_tree(struct btrfs_trans_handle *trans, 814a5ed9182SOmar Sandoval u64 start, u64 size) 815a5ed9182SOmar Sandoval { 81632da5386SDavid Sterba struct btrfs_block_group *block_group; 817a5ed9182SOmar Sandoval struct btrfs_path *path; 818a5ed9182SOmar Sandoval int ret; 819a5ed9182SOmar Sandoval 82025a356d3SNikolay Borisov if (!btrfs_fs_compat_ro(trans->fs_info, FREE_SPACE_TREE)) 821a5ed9182SOmar Sandoval return 0; 822a5ed9182SOmar Sandoval 823a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 824a5ed9182SOmar Sandoval if (!path) { 825a5ed9182SOmar Sandoval ret = -ENOMEM; 826a5ed9182SOmar Sandoval goto out; 827a5ed9182SOmar Sandoval } 828a5ed9182SOmar Sandoval 82925a356d3SNikolay Borisov block_group = btrfs_lookup_block_group(trans->fs_info, start); 830a5ed9182SOmar Sandoval if (!block_group) { 831a5ed9182SOmar Sandoval ASSERT(0); 832a5ed9182SOmar Sandoval ret = -ENOENT; 833a5ed9182SOmar Sandoval goto out; 834a5ed9182SOmar Sandoval } 835a5ed9182SOmar Sandoval 836a5ed9182SOmar Sandoval mutex_lock(&block_group->free_space_lock); 837c31683a6SNikolay Borisov ret = __remove_from_free_space_tree(trans, block_group, path, start, 838c31683a6SNikolay Borisov size); 839a5ed9182SOmar Sandoval mutex_unlock(&block_group->free_space_lock); 840a5ed9182SOmar Sandoval 841a5ed9182SOmar Sandoval btrfs_put_block_group(block_group); 842a5ed9182SOmar Sandoval out: 843a5ed9182SOmar Sandoval btrfs_free_path(path); 844a5ed9182SOmar Sandoval if (ret) 84566642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 846a5ed9182SOmar Sandoval return ret; 847a5ed9182SOmar Sandoval } 848a5ed9182SOmar Sandoval 849a5ed9182SOmar Sandoval static int add_free_space_extent(struct btrfs_trans_handle *trans, 85032da5386SDavid Sterba struct btrfs_block_group *block_group, 851a5ed9182SOmar Sandoval struct btrfs_path *path, 852a5ed9182SOmar Sandoval u64 start, u64 size) 853a5ed9182SOmar Sandoval { 8545cb17822SNikolay Borisov struct btrfs_root *root = trans->fs_info->free_space_root; 855a5ed9182SOmar Sandoval struct btrfs_key key, new_key; 856a5ed9182SOmar Sandoval u64 found_start, found_end; 857a5ed9182SOmar Sandoval u64 end = start + size; 858a5ed9182SOmar Sandoval int new_extents = 1; 859a5ed9182SOmar Sandoval int ret; 860a5ed9182SOmar Sandoval 861a5ed9182SOmar Sandoval /* 862a5ed9182SOmar Sandoval * We are adding a new extent of free space, but we need to merge 863a5ed9182SOmar Sandoval * extents. There are four cases here: 864a5ed9182SOmar Sandoval * 865a5ed9182SOmar Sandoval * 1. The new extent does not have any immediate neighbors to merge 866a5ed9182SOmar Sandoval * with: add the new key and increment the free space extent count. We 867a5ed9182SOmar Sandoval * may need to convert the block group to bitmaps as a result. 868a5ed9182SOmar Sandoval * 2. The new extent has an immediate neighbor before it: remove the 869a5ed9182SOmar Sandoval * previous key and insert a new key combining both of them. There is no 870a5ed9182SOmar Sandoval * net change in the number of extents. 871a5ed9182SOmar Sandoval * 3. The new extent has an immediate neighbor after it: remove the next 872a5ed9182SOmar Sandoval * key and insert a new key combining both of them. There is no net 873a5ed9182SOmar Sandoval * change in the number of extents. 874a5ed9182SOmar Sandoval * 4. The new extent has immediate neighbors on both sides: remove both 875a5ed9182SOmar Sandoval * of the keys and insert a new key combining all of them. Where we used 876a5ed9182SOmar Sandoval * to have two extents, we now have one, so decrement the extent count. 877a5ed9182SOmar Sandoval */ 878a5ed9182SOmar Sandoval 879a5ed9182SOmar Sandoval new_key.objectid = start; 880a5ed9182SOmar Sandoval new_key.type = BTRFS_FREE_SPACE_EXTENT_KEY; 881a5ed9182SOmar Sandoval new_key.offset = size; 882a5ed9182SOmar Sandoval 883a5ed9182SOmar Sandoval /* Search for a neighbor on the left. */ 884b3470b5dSDavid Sterba if (start == block_group->start) 885a5ed9182SOmar Sandoval goto right; 886a5ed9182SOmar Sandoval key.objectid = start - 1; 887a5ed9182SOmar Sandoval key.type = (u8)-1; 888a5ed9182SOmar Sandoval key.offset = (u64)-1; 889a5ed9182SOmar Sandoval 890a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 891a5ed9182SOmar Sandoval if (ret) 892a5ed9182SOmar Sandoval goto out; 893a5ed9182SOmar Sandoval 894a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 895a5ed9182SOmar Sandoval 896a5ed9182SOmar Sandoval if (key.type != BTRFS_FREE_SPACE_EXTENT_KEY) { 897a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_INFO_KEY); 898a5ed9182SOmar Sandoval btrfs_release_path(path); 899a5ed9182SOmar Sandoval goto right; 900a5ed9182SOmar Sandoval } 901a5ed9182SOmar Sandoval 902a5ed9182SOmar Sandoval found_start = key.objectid; 903a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 904b3470b5dSDavid Sterba ASSERT(found_start >= block_group->start && 905b3470b5dSDavid Sterba found_end > block_group->start); 906a5ed9182SOmar Sandoval ASSERT(found_start < start && found_end <= start); 907a5ed9182SOmar Sandoval 908a5ed9182SOmar Sandoval /* 909a5ed9182SOmar Sandoval * Delete the neighbor on the left and absorb it into the new key (cases 910a5ed9182SOmar Sandoval * 2 and 4). 911a5ed9182SOmar Sandoval */ 912a5ed9182SOmar Sandoval if (found_end == start) { 913a5ed9182SOmar Sandoval ret = btrfs_del_item(trans, root, path); 914a5ed9182SOmar Sandoval if (ret) 915a5ed9182SOmar Sandoval goto out; 916a5ed9182SOmar Sandoval new_key.objectid = found_start; 917a5ed9182SOmar Sandoval new_key.offset += key.offset; 918a5ed9182SOmar Sandoval new_extents--; 919a5ed9182SOmar Sandoval } 920a5ed9182SOmar Sandoval btrfs_release_path(path); 921a5ed9182SOmar Sandoval 922a5ed9182SOmar Sandoval right: 923a5ed9182SOmar Sandoval /* Search for a neighbor on the right. */ 924b3470b5dSDavid Sterba if (end == block_group->start + block_group->length) 925a5ed9182SOmar Sandoval goto insert; 926a5ed9182SOmar Sandoval key.objectid = end; 927a5ed9182SOmar Sandoval key.type = (u8)-1; 928a5ed9182SOmar Sandoval key.offset = (u64)-1; 929a5ed9182SOmar Sandoval 930a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 931a5ed9182SOmar Sandoval if (ret) 932a5ed9182SOmar Sandoval goto out; 933a5ed9182SOmar Sandoval 934a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 935a5ed9182SOmar Sandoval 936a5ed9182SOmar Sandoval if (key.type != BTRFS_FREE_SPACE_EXTENT_KEY) { 937a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_INFO_KEY); 938a5ed9182SOmar Sandoval btrfs_release_path(path); 939a5ed9182SOmar Sandoval goto insert; 940a5ed9182SOmar Sandoval } 941a5ed9182SOmar Sandoval 942a5ed9182SOmar Sandoval found_start = key.objectid; 943a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 944b3470b5dSDavid Sterba ASSERT(found_start >= block_group->start && 945b3470b5dSDavid Sterba found_end > block_group->start); 946a5ed9182SOmar Sandoval ASSERT((found_start < start && found_end <= start) || 947a5ed9182SOmar Sandoval (found_start >= end && found_end > end)); 948a5ed9182SOmar Sandoval 949a5ed9182SOmar Sandoval /* 950a5ed9182SOmar Sandoval * Delete the neighbor on the right and absorb it into the new key 951a5ed9182SOmar Sandoval * (cases 3 and 4). 952a5ed9182SOmar Sandoval */ 953a5ed9182SOmar Sandoval if (found_start == end) { 954a5ed9182SOmar Sandoval ret = btrfs_del_item(trans, root, path); 955a5ed9182SOmar Sandoval if (ret) 956a5ed9182SOmar Sandoval goto out; 957a5ed9182SOmar Sandoval new_key.offset += key.offset; 958a5ed9182SOmar Sandoval new_extents--; 959a5ed9182SOmar Sandoval } 960a5ed9182SOmar Sandoval btrfs_release_path(path); 961a5ed9182SOmar Sandoval 962a5ed9182SOmar Sandoval insert: 963a5ed9182SOmar Sandoval /* Insert the new key (cases 1-4). */ 964a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &new_key, 0); 965a5ed9182SOmar Sandoval if (ret) 966a5ed9182SOmar Sandoval goto out; 967a5ed9182SOmar Sandoval 968a5ed9182SOmar Sandoval btrfs_release_path(path); 969690d7682SNikolay Borisov ret = update_free_space_extent_count(trans, block_group, path, 970a5ed9182SOmar Sandoval new_extents); 971a5ed9182SOmar Sandoval 972a5ed9182SOmar Sandoval out: 973a5ed9182SOmar Sandoval return ret; 974a5ed9182SOmar Sandoval } 975a5ed9182SOmar Sandoval 976ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 977a5ed9182SOmar Sandoval int __add_to_free_space_tree(struct btrfs_trans_handle *trans, 97832da5386SDavid Sterba struct btrfs_block_group *block_group, 979a5ed9182SOmar Sandoval struct btrfs_path *path, u64 start, u64 size) 980a5ed9182SOmar Sandoval { 981a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 982a5ed9182SOmar Sandoval u32 flags; 983a5ed9182SOmar Sandoval int ret; 984a5ed9182SOmar Sandoval 985a5ed9182SOmar Sandoval if (block_group->needs_free_space) { 9869a7e0f92SNikolay Borisov ret = __add_block_group_free_space(trans, block_group, path); 987a5ed9182SOmar Sandoval if (ret) 988a5ed9182SOmar Sandoval return ret; 989a5ed9182SOmar Sandoval } 990a5ed9182SOmar Sandoval 9912ccf545eSDavid Sterba info = search_free_space_info(NULL, block_group, path, 0); 992a5ed9182SOmar Sandoval if (IS_ERR(info)) 993a5ed9182SOmar Sandoval return PTR_ERR(info); 994a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(path->nodes[0], info); 995a5ed9182SOmar Sandoval btrfs_release_path(path); 996a5ed9182SOmar Sandoval 997a5ed9182SOmar Sandoval if (flags & BTRFS_FREE_SPACE_USING_BITMAPS) { 99885a7ef13SNikolay Borisov return modify_free_space_bitmap(trans, block_group, path, 99985a7ef13SNikolay Borisov start, size, 0); 1000a5ed9182SOmar Sandoval } else { 10015cb17822SNikolay Borisov return add_free_space_extent(trans, block_group, path, start, 10025cb17822SNikolay Borisov size); 1003a5ed9182SOmar Sandoval } 1004a5ed9182SOmar Sandoval } 1005a5ed9182SOmar Sandoval 1006a5ed9182SOmar Sandoval int add_to_free_space_tree(struct btrfs_trans_handle *trans, 1007a5ed9182SOmar Sandoval u64 start, u64 size) 1008a5ed9182SOmar Sandoval { 100932da5386SDavid Sterba struct btrfs_block_group *block_group; 1010a5ed9182SOmar Sandoval struct btrfs_path *path; 1011a5ed9182SOmar Sandoval int ret; 1012a5ed9182SOmar Sandoval 1013e7355e50SNikolay Borisov if (!btrfs_fs_compat_ro(trans->fs_info, FREE_SPACE_TREE)) 1014a5ed9182SOmar Sandoval return 0; 1015a5ed9182SOmar Sandoval 1016a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1017a5ed9182SOmar Sandoval if (!path) { 1018a5ed9182SOmar Sandoval ret = -ENOMEM; 1019a5ed9182SOmar Sandoval goto out; 1020a5ed9182SOmar Sandoval } 1021a5ed9182SOmar Sandoval 1022e7355e50SNikolay Borisov block_group = btrfs_lookup_block_group(trans->fs_info, start); 1023a5ed9182SOmar Sandoval if (!block_group) { 1024a5ed9182SOmar Sandoval ASSERT(0); 1025a5ed9182SOmar Sandoval ret = -ENOENT; 1026a5ed9182SOmar Sandoval goto out; 1027a5ed9182SOmar Sandoval } 1028a5ed9182SOmar Sandoval 1029a5ed9182SOmar Sandoval mutex_lock(&block_group->free_space_lock); 10302d5cffa1SNikolay Borisov ret = __add_to_free_space_tree(trans, block_group, path, start, size); 1031a5ed9182SOmar Sandoval mutex_unlock(&block_group->free_space_lock); 1032a5ed9182SOmar Sandoval 1033a5ed9182SOmar Sandoval btrfs_put_block_group(block_group); 1034a5ed9182SOmar Sandoval out: 1035a5ed9182SOmar Sandoval btrfs_free_path(path); 1036a5ed9182SOmar Sandoval if (ret) 103766642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 1038a5ed9182SOmar Sandoval return ret; 1039a5ed9182SOmar Sandoval } 1040a5ed9182SOmar Sandoval 1041a5ed9182SOmar Sandoval /* 1042a5ed9182SOmar Sandoval * Populate the free space tree by walking the extent tree. Operations on the 1043a5ed9182SOmar Sandoval * extent tree that happen as a result of writes to the free space tree will go 1044a5ed9182SOmar Sandoval * through the normal add/remove hooks. 1045a5ed9182SOmar Sandoval */ 1046a5ed9182SOmar Sandoval static int populate_free_space_tree(struct btrfs_trans_handle *trans, 104732da5386SDavid Sterba struct btrfs_block_group *block_group) 1048a5ed9182SOmar Sandoval { 1049ffa9a9efSNikolay Borisov struct btrfs_root *extent_root = trans->fs_info->extent_root; 1050a5ed9182SOmar Sandoval struct btrfs_path *path, *path2; 1051a5ed9182SOmar Sandoval struct btrfs_key key; 1052a5ed9182SOmar Sandoval u64 start, end; 1053a5ed9182SOmar Sandoval int ret; 1054a5ed9182SOmar Sandoval 1055a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1056a5ed9182SOmar Sandoval if (!path) 1057a5ed9182SOmar Sandoval return -ENOMEM; 1058019599adSGu Jinxiang path->reada = READA_FORWARD; 1059a5ed9182SOmar Sandoval 1060a5ed9182SOmar Sandoval path2 = btrfs_alloc_path(); 1061a5ed9182SOmar Sandoval if (!path2) { 1062a5ed9182SOmar Sandoval btrfs_free_path(path); 1063a5ed9182SOmar Sandoval return -ENOMEM; 1064a5ed9182SOmar Sandoval } 1065a5ed9182SOmar Sandoval 106666afee18SNikolay Borisov ret = add_new_free_space_info(trans, block_group, path2); 1067a5ed9182SOmar Sandoval if (ret) 1068a5ed9182SOmar Sandoval goto out; 1069a5ed9182SOmar Sandoval 1070511711afSChris Mason mutex_lock(&block_group->free_space_lock); 1071511711afSChris Mason 1072a5ed9182SOmar Sandoval /* 1073a5ed9182SOmar Sandoval * Iterate through all of the extent and metadata items in this block 1074a5ed9182SOmar Sandoval * group, adding the free space between them and the free space at the 1075a5ed9182SOmar Sandoval * end. Note that EXTENT_ITEM and METADATA_ITEM are less than 1076a5ed9182SOmar Sandoval * BLOCK_GROUP_ITEM, so an extent may precede the block group that it's 1077a5ed9182SOmar Sandoval * contained in. 1078a5ed9182SOmar Sandoval */ 1079b3470b5dSDavid Sterba key.objectid = block_group->start; 1080a5ed9182SOmar Sandoval key.type = BTRFS_EXTENT_ITEM_KEY; 1081a5ed9182SOmar Sandoval key.offset = 0; 1082a5ed9182SOmar Sandoval 1083a5ed9182SOmar Sandoval ret = btrfs_search_slot_for_read(extent_root, &key, path, 1, 0); 1084a5ed9182SOmar Sandoval if (ret < 0) 1085511711afSChris Mason goto out_locked; 1086a5ed9182SOmar Sandoval ASSERT(ret == 0); 1087a5ed9182SOmar Sandoval 1088b3470b5dSDavid Sterba start = block_group->start; 1089b3470b5dSDavid Sterba end = block_group->start + block_group->length; 1090a5ed9182SOmar Sandoval while (1) { 1091a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 1092a5ed9182SOmar Sandoval 1093a5ed9182SOmar Sandoval if (key.type == BTRFS_EXTENT_ITEM_KEY || 1094a5ed9182SOmar Sandoval key.type == BTRFS_METADATA_ITEM_KEY) { 1095a5ed9182SOmar Sandoval if (key.objectid >= end) 1096a5ed9182SOmar Sandoval break; 1097a5ed9182SOmar Sandoval 1098a5ed9182SOmar Sandoval if (start < key.objectid) { 10992d5cffa1SNikolay Borisov ret = __add_to_free_space_tree(trans, 1100a5ed9182SOmar Sandoval block_group, 1101a5ed9182SOmar Sandoval path2, start, 1102a5ed9182SOmar Sandoval key.objectid - 1103a5ed9182SOmar Sandoval start); 1104a5ed9182SOmar Sandoval if (ret) 1105511711afSChris Mason goto out_locked; 1106a5ed9182SOmar Sandoval } 1107a5ed9182SOmar Sandoval start = key.objectid; 1108a5ed9182SOmar Sandoval if (key.type == BTRFS_METADATA_ITEM_KEY) 1109ffa9a9efSNikolay Borisov start += trans->fs_info->nodesize; 1110a5ed9182SOmar Sandoval else 1111a5ed9182SOmar Sandoval start += key.offset; 1112a5ed9182SOmar Sandoval } else if (key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { 1113b3470b5dSDavid Sterba if (key.objectid != block_group->start) 1114a5ed9182SOmar Sandoval break; 1115a5ed9182SOmar Sandoval } 1116a5ed9182SOmar Sandoval 1117a5ed9182SOmar Sandoval ret = btrfs_next_item(extent_root, path); 1118a5ed9182SOmar Sandoval if (ret < 0) 1119511711afSChris Mason goto out_locked; 1120a5ed9182SOmar Sandoval if (ret) 1121a5ed9182SOmar Sandoval break; 1122a5ed9182SOmar Sandoval } 1123a5ed9182SOmar Sandoval if (start < end) { 11242d5cffa1SNikolay Borisov ret = __add_to_free_space_tree(trans, block_group, path2, 11252d5cffa1SNikolay Borisov start, end - start); 1126a5ed9182SOmar Sandoval if (ret) 1127511711afSChris Mason goto out_locked; 1128a5ed9182SOmar Sandoval } 1129a5ed9182SOmar Sandoval 1130a5ed9182SOmar Sandoval ret = 0; 1131511711afSChris Mason out_locked: 1132511711afSChris Mason mutex_unlock(&block_group->free_space_lock); 1133a5ed9182SOmar Sandoval out: 1134a5ed9182SOmar Sandoval btrfs_free_path(path2); 1135a5ed9182SOmar Sandoval btrfs_free_path(path); 1136a5ed9182SOmar Sandoval return ret; 1137a5ed9182SOmar Sandoval } 1138a5ed9182SOmar Sandoval 1139a5ed9182SOmar Sandoval int btrfs_create_free_space_tree(struct btrfs_fs_info *fs_info) 1140a5ed9182SOmar Sandoval { 1141a5ed9182SOmar Sandoval struct btrfs_trans_handle *trans; 1142a5ed9182SOmar Sandoval struct btrfs_root *tree_root = fs_info->tree_root; 1143a5ed9182SOmar Sandoval struct btrfs_root *free_space_root; 114432da5386SDavid Sterba struct btrfs_block_group *block_group; 1145a5ed9182SOmar Sandoval struct rb_node *node; 1146a5ed9182SOmar Sandoval int ret; 1147a5ed9182SOmar Sandoval 1148a5ed9182SOmar Sandoval trans = btrfs_start_transaction(tree_root, 0); 1149a5ed9182SOmar Sandoval if (IS_ERR(trans)) 1150a5ed9182SOmar Sandoval return PTR_ERR(trans); 1151a5ed9182SOmar Sandoval 1152afcdd129SJosef Bacik set_bit(BTRFS_FS_CREATING_FREE_SPACE_TREE, &fs_info->flags); 11532f96e402SJosef Bacik set_bit(BTRFS_FS_FREE_SPACE_TREE_UNTRUSTED, &fs_info->flags); 11549b7a2440SDavid Sterba free_space_root = btrfs_create_tree(trans, 1155a5ed9182SOmar Sandoval BTRFS_FREE_SPACE_TREE_OBJECTID); 1156a5ed9182SOmar Sandoval if (IS_ERR(free_space_root)) { 1157a5ed9182SOmar Sandoval ret = PTR_ERR(free_space_root); 1158a5ed9182SOmar Sandoval goto abort; 1159a5ed9182SOmar Sandoval } 1160a5ed9182SOmar Sandoval fs_info->free_space_root = free_space_root; 1161a5ed9182SOmar Sandoval 1162a5ed9182SOmar Sandoval node = rb_first(&fs_info->block_group_cache_tree); 1163a5ed9182SOmar Sandoval while (node) { 116432da5386SDavid Sterba block_group = rb_entry(node, struct btrfs_block_group, 1165a5ed9182SOmar Sandoval cache_node); 1166ffa9a9efSNikolay Borisov ret = populate_free_space_tree(trans, block_group); 1167a5ed9182SOmar Sandoval if (ret) 1168a5ed9182SOmar Sandoval goto abort; 1169a5ed9182SOmar Sandoval node = rb_next(node); 1170a5ed9182SOmar Sandoval } 1171a5ed9182SOmar Sandoval 1172a5ed9182SOmar Sandoval btrfs_set_fs_compat_ro(fs_info, FREE_SPACE_TREE); 11736675df31SOmar Sandoval btrfs_set_fs_compat_ro(fs_info, FREE_SPACE_TREE_VALID); 1174afcdd129SJosef Bacik clear_bit(BTRFS_FS_CREATING_FREE_SPACE_TREE, &fs_info->flags); 11752f96e402SJosef Bacik ret = btrfs_commit_transaction(trans); 1176a5ed9182SOmar Sandoval 11772f96e402SJosef Bacik /* 11782f96e402SJosef Bacik * Now that we've committed the transaction any reading of our commit 11792f96e402SJosef Bacik * root will be safe, so we can cache from the free space tree now. 11802f96e402SJosef Bacik */ 11812f96e402SJosef Bacik clear_bit(BTRFS_FS_FREE_SPACE_TREE_UNTRUSTED, &fs_info->flags); 11822f96e402SJosef Bacik return ret; 1183a5ed9182SOmar Sandoval 1184a5ed9182SOmar Sandoval abort: 1185afcdd129SJosef Bacik clear_bit(BTRFS_FS_CREATING_FREE_SPACE_TREE, &fs_info->flags); 11862f96e402SJosef Bacik clear_bit(BTRFS_FS_FREE_SPACE_TREE_UNTRUSTED, &fs_info->flags); 118766642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 11883a45bb20SJeff Mahoney btrfs_end_transaction(trans); 1189a5ed9182SOmar Sandoval return ret; 1190a5ed9182SOmar Sandoval } 1191a5ed9182SOmar Sandoval 1192a5ed9182SOmar Sandoval static int clear_free_space_tree(struct btrfs_trans_handle *trans, 1193a5ed9182SOmar Sandoval struct btrfs_root *root) 1194a5ed9182SOmar Sandoval { 1195a5ed9182SOmar Sandoval struct btrfs_path *path; 1196a5ed9182SOmar Sandoval struct btrfs_key key; 1197a5ed9182SOmar Sandoval int nr; 1198a5ed9182SOmar Sandoval int ret; 1199a5ed9182SOmar Sandoval 1200a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1201a5ed9182SOmar Sandoval if (!path) 1202a5ed9182SOmar Sandoval return -ENOMEM; 1203a5ed9182SOmar Sandoval 1204a5ed9182SOmar Sandoval key.objectid = 0; 1205a5ed9182SOmar Sandoval key.type = 0; 1206a5ed9182SOmar Sandoval key.offset = 0; 1207a5ed9182SOmar Sandoval 1208a5ed9182SOmar Sandoval while (1) { 1209a5ed9182SOmar Sandoval ret = btrfs_search_slot(trans, root, &key, path, -1, 1); 1210a5ed9182SOmar Sandoval if (ret < 0) 1211a5ed9182SOmar Sandoval goto out; 1212a5ed9182SOmar Sandoval 1213a5ed9182SOmar Sandoval nr = btrfs_header_nritems(path->nodes[0]); 1214a5ed9182SOmar Sandoval if (!nr) 1215a5ed9182SOmar Sandoval break; 1216a5ed9182SOmar Sandoval 1217a5ed9182SOmar Sandoval path->slots[0] = 0; 1218a5ed9182SOmar Sandoval ret = btrfs_del_items(trans, root, path, 0, nr); 1219a5ed9182SOmar Sandoval if (ret) 1220a5ed9182SOmar Sandoval goto out; 1221a5ed9182SOmar Sandoval 1222a5ed9182SOmar Sandoval btrfs_release_path(path); 1223a5ed9182SOmar Sandoval } 1224a5ed9182SOmar Sandoval 1225a5ed9182SOmar Sandoval ret = 0; 1226a5ed9182SOmar Sandoval out: 1227a5ed9182SOmar Sandoval btrfs_free_path(path); 1228a5ed9182SOmar Sandoval return ret; 1229a5ed9182SOmar Sandoval } 1230a5ed9182SOmar Sandoval 1231a5ed9182SOmar Sandoval int btrfs_clear_free_space_tree(struct btrfs_fs_info *fs_info) 1232a5ed9182SOmar Sandoval { 1233a5ed9182SOmar Sandoval struct btrfs_trans_handle *trans; 1234a5ed9182SOmar Sandoval struct btrfs_root *tree_root = fs_info->tree_root; 1235a5ed9182SOmar Sandoval struct btrfs_root *free_space_root = fs_info->free_space_root; 1236a5ed9182SOmar Sandoval int ret; 1237a5ed9182SOmar Sandoval 1238a5ed9182SOmar Sandoval trans = btrfs_start_transaction(tree_root, 0); 1239a5ed9182SOmar Sandoval if (IS_ERR(trans)) 1240a5ed9182SOmar Sandoval return PTR_ERR(trans); 1241a5ed9182SOmar Sandoval 1242a5ed9182SOmar Sandoval btrfs_clear_fs_compat_ro(fs_info, FREE_SPACE_TREE); 12436675df31SOmar Sandoval btrfs_clear_fs_compat_ro(fs_info, FREE_SPACE_TREE_VALID); 1244a5ed9182SOmar Sandoval fs_info->free_space_root = NULL; 1245a5ed9182SOmar Sandoval 1246a5ed9182SOmar Sandoval ret = clear_free_space_tree(trans, free_space_root); 1247a5ed9182SOmar Sandoval if (ret) 1248a5ed9182SOmar Sandoval goto abort; 1249a5ed9182SOmar Sandoval 1250ab9ce7d4SLu Fengqi ret = btrfs_del_root(trans, &free_space_root->root_key); 1251a5ed9182SOmar Sandoval if (ret) 1252a5ed9182SOmar Sandoval goto abort; 1253a5ed9182SOmar Sandoval 1254a5ed9182SOmar Sandoval list_del(&free_space_root->dirty_list); 1255a5ed9182SOmar Sandoval 1256a5ed9182SOmar Sandoval btrfs_tree_lock(free_space_root->node); 12576a884d7dSDavid Sterba btrfs_clean_tree_block(free_space_root->node); 1258a5ed9182SOmar Sandoval btrfs_tree_unlock(free_space_root->node); 1259*7a163608SFilipe Manana btrfs_free_tree_block(trans, btrfs_root_id(free_space_root), 1260*7a163608SFilipe Manana free_space_root->node, 0, 1); 1261a5ed9182SOmar Sandoval 126200246528SJosef Bacik btrfs_put_root(free_space_root); 1263a5ed9182SOmar Sandoval 12640bef7109SSahil Kang return btrfs_commit_transaction(trans); 1265a5ed9182SOmar Sandoval 1266a5ed9182SOmar Sandoval abort: 126766642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 12683a45bb20SJeff Mahoney btrfs_end_transaction(trans); 1269a5ed9182SOmar Sandoval return ret; 1270a5ed9182SOmar Sandoval } 1271a5ed9182SOmar Sandoval 1272a5ed9182SOmar Sandoval static int __add_block_group_free_space(struct btrfs_trans_handle *trans, 127332da5386SDavid Sterba struct btrfs_block_group *block_group, 1274a5ed9182SOmar Sandoval struct btrfs_path *path) 1275a5ed9182SOmar Sandoval { 1276a5ed9182SOmar Sandoval int ret; 1277a5ed9182SOmar Sandoval 1278a5ed9182SOmar Sandoval block_group->needs_free_space = 0; 1279a5ed9182SOmar Sandoval 128066afee18SNikolay Borisov ret = add_new_free_space_info(trans, block_group, path); 1281a5ed9182SOmar Sandoval if (ret) 1282a5ed9182SOmar Sandoval return ret; 1283a5ed9182SOmar Sandoval 12842d5cffa1SNikolay Borisov return __add_to_free_space_tree(trans, block_group, path, 1285b3470b5dSDavid Sterba block_group->start, 1286b3470b5dSDavid Sterba block_group->length); 1287a5ed9182SOmar Sandoval } 1288a5ed9182SOmar Sandoval 1289a5ed9182SOmar Sandoval int add_block_group_free_space(struct btrfs_trans_handle *trans, 129032da5386SDavid Sterba struct btrfs_block_group *block_group) 1291a5ed9182SOmar Sandoval { 1292e4e0711cSNikolay Borisov struct btrfs_fs_info *fs_info = trans->fs_info; 1293a5ed9182SOmar Sandoval struct btrfs_path *path = NULL; 1294a5ed9182SOmar Sandoval int ret = 0; 1295a5ed9182SOmar Sandoval 1296a5ed9182SOmar Sandoval if (!btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) 1297a5ed9182SOmar Sandoval return 0; 1298a5ed9182SOmar Sandoval 1299a5ed9182SOmar Sandoval mutex_lock(&block_group->free_space_lock); 1300a5ed9182SOmar Sandoval if (!block_group->needs_free_space) 1301a5ed9182SOmar Sandoval goto out; 1302a5ed9182SOmar Sandoval 1303a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1304a5ed9182SOmar Sandoval if (!path) { 1305a5ed9182SOmar Sandoval ret = -ENOMEM; 1306a5ed9182SOmar Sandoval goto out; 1307a5ed9182SOmar Sandoval } 1308a5ed9182SOmar Sandoval 13099a7e0f92SNikolay Borisov ret = __add_block_group_free_space(trans, block_group, path); 1310a5ed9182SOmar Sandoval 1311a5ed9182SOmar Sandoval out: 1312a5ed9182SOmar Sandoval btrfs_free_path(path); 1313a5ed9182SOmar Sandoval mutex_unlock(&block_group->free_space_lock); 1314a5ed9182SOmar Sandoval if (ret) 131566642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 1316a5ed9182SOmar Sandoval return ret; 1317a5ed9182SOmar Sandoval } 1318a5ed9182SOmar Sandoval 1319a5ed9182SOmar Sandoval int remove_block_group_free_space(struct btrfs_trans_handle *trans, 132032da5386SDavid Sterba struct btrfs_block_group *block_group) 1321a5ed9182SOmar Sandoval { 1322f3f72779SNikolay Borisov struct btrfs_root *root = trans->fs_info->free_space_root; 1323a5ed9182SOmar Sandoval struct btrfs_path *path; 1324a5ed9182SOmar Sandoval struct btrfs_key key, found_key; 1325a5ed9182SOmar Sandoval struct extent_buffer *leaf; 1326a5ed9182SOmar Sandoval u64 start, end; 1327a5ed9182SOmar Sandoval int done = 0, nr; 1328a5ed9182SOmar Sandoval int ret; 1329a5ed9182SOmar Sandoval 1330f3f72779SNikolay Borisov if (!btrfs_fs_compat_ro(trans->fs_info, FREE_SPACE_TREE)) 1331a5ed9182SOmar Sandoval return 0; 1332a5ed9182SOmar Sandoval 1333a5ed9182SOmar Sandoval if (block_group->needs_free_space) { 1334a5ed9182SOmar Sandoval /* We never added this block group to the free space tree. */ 1335a5ed9182SOmar Sandoval return 0; 1336a5ed9182SOmar Sandoval } 1337a5ed9182SOmar Sandoval 1338a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1339a5ed9182SOmar Sandoval if (!path) { 1340a5ed9182SOmar Sandoval ret = -ENOMEM; 1341a5ed9182SOmar Sandoval goto out; 1342a5ed9182SOmar Sandoval } 1343a5ed9182SOmar Sandoval 1344b3470b5dSDavid Sterba start = block_group->start; 1345b3470b5dSDavid Sterba end = block_group->start + block_group->length; 1346a5ed9182SOmar Sandoval 1347a5ed9182SOmar Sandoval key.objectid = end - 1; 1348a5ed9182SOmar Sandoval key.type = (u8)-1; 1349a5ed9182SOmar Sandoval key.offset = (u64)-1; 1350a5ed9182SOmar Sandoval 1351a5ed9182SOmar Sandoval while (!done) { 1352a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 1353a5ed9182SOmar Sandoval if (ret) 1354a5ed9182SOmar Sandoval goto out; 1355a5ed9182SOmar Sandoval 1356a5ed9182SOmar Sandoval leaf = path->nodes[0]; 1357a5ed9182SOmar Sandoval nr = 0; 1358a5ed9182SOmar Sandoval path->slots[0]++; 1359a5ed9182SOmar Sandoval while (path->slots[0] > 0) { 1360a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0] - 1); 1361a5ed9182SOmar Sandoval 1362a5ed9182SOmar Sandoval if (found_key.type == BTRFS_FREE_SPACE_INFO_KEY) { 1363b3470b5dSDavid Sterba ASSERT(found_key.objectid == block_group->start); 1364b3470b5dSDavid Sterba ASSERT(found_key.offset == block_group->length); 1365a5ed9182SOmar Sandoval done = 1; 1366a5ed9182SOmar Sandoval nr++; 1367a5ed9182SOmar Sandoval path->slots[0]--; 1368a5ed9182SOmar Sandoval break; 1369a5ed9182SOmar Sandoval } else if (found_key.type == BTRFS_FREE_SPACE_EXTENT_KEY || 1370a5ed9182SOmar Sandoval found_key.type == BTRFS_FREE_SPACE_BITMAP_KEY) { 1371a5ed9182SOmar Sandoval ASSERT(found_key.objectid >= start); 1372a5ed9182SOmar Sandoval ASSERT(found_key.objectid < end); 1373a5ed9182SOmar Sandoval ASSERT(found_key.objectid + found_key.offset <= end); 1374a5ed9182SOmar Sandoval nr++; 1375a5ed9182SOmar Sandoval path->slots[0]--; 1376a5ed9182SOmar Sandoval } else { 1377a5ed9182SOmar Sandoval ASSERT(0); 1378a5ed9182SOmar Sandoval } 1379a5ed9182SOmar Sandoval } 1380a5ed9182SOmar Sandoval 1381a5ed9182SOmar Sandoval ret = btrfs_del_items(trans, root, path, path->slots[0], nr); 1382a5ed9182SOmar Sandoval if (ret) 1383a5ed9182SOmar Sandoval goto out; 1384a5ed9182SOmar Sandoval btrfs_release_path(path); 1385a5ed9182SOmar Sandoval } 1386a5ed9182SOmar Sandoval 1387a5ed9182SOmar Sandoval ret = 0; 1388a5ed9182SOmar Sandoval out: 1389a5ed9182SOmar Sandoval btrfs_free_path(path); 1390a5ed9182SOmar Sandoval if (ret) 139166642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 1392a5ed9182SOmar Sandoval return ret; 1393a5ed9182SOmar Sandoval } 1394a5ed9182SOmar Sandoval 1395a5ed9182SOmar Sandoval static int load_free_space_bitmaps(struct btrfs_caching_control *caching_ctl, 1396a5ed9182SOmar Sandoval struct btrfs_path *path, 1397a5ed9182SOmar Sandoval u32 expected_extent_count) 1398a5ed9182SOmar Sandoval { 139932da5386SDavid Sterba struct btrfs_block_group *block_group; 1400a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info; 1401a5ed9182SOmar Sandoval struct btrfs_root *root; 1402a5ed9182SOmar Sandoval struct btrfs_key key; 1403a5ed9182SOmar Sandoval int prev_bit = 0, bit; 1404a5ed9182SOmar Sandoval /* Initialize to silence GCC. */ 1405a5ed9182SOmar Sandoval u64 extent_start = 0; 1406a5ed9182SOmar Sandoval u64 end, offset; 1407a5ed9182SOmar Sandoval u64 total_found = 0; 1408a5ed9182SOmar Sandoval u32 extent_count = 0; 1409a5ed9182SOmar Sandoval int ret; 1410a5ed9182SOmar Sandoval 1411a5ed9182SOmar Sandoval block_group = caching_ctl->block_group; 1412a5ed9182SOmar Sandoval fs_info = block_group->fs_info; 1413a5ed9182SOmar Sandoval root = fs_info->free_space_root; 1414a5ed9182SOmar Sandoval 1415b3470b5dSDavid Sterba end = block_group->start + block_group->length; 1416a5ed9182SOmar Sandoval 1417a5ed9182SOmar Sandoval while (1) { 1418a5ed9182SOmar Sandoval ret = btrfs_next_item(root, path); 1419a5ed9182SOmar Sandoval if (ret < 0) 1420a5ed9182SOmar Sandoval goto out; 1421a5ed9182SOmar Sandoval if (ret) 1422a5ed9182SOmar Sandoval break; 1423a5ed9182SOmar Sandoval 1424a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 1425a5ed9182SOmar Sandoval 1426a5ed9182SOmar Sandoval if (key.type == BTRFS_FREE_SPACE_INFO_KEY) 1427a5ed9182SOmar Sandoval break; 1428a5ed9182SOmar Sandoval 1429a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_BITMAP_KEY); 1430a5ed9182SOmar Sandoval ASSERT(key.objectid < end && key.objectid + key.offset <= end); 1431a5ed9182SOmar Sandoval 1432a5ed9182SOmar Sandoval caching_ctl->progress = key.objectid; 1433a5ed9182SOmar Sandoval 1434a5ed9182SOmar Sandoval offset = key.objectid; 1435a5ed9182SOmar Sandoval while (offset < key.objectid + key.offset) { 1436a5ed9182SOmar Sandoval bit = free_space_test_bit(block_group, path, offset); 1437a5ed9182SOmar Sandoval if (prev_bit == 0 && bit == 1) { 1438a5ed9182SOmar Sandoval extent_start = offset; 1439a5ed9182SOmar Sandoval } else if (prev_bit == 1 && bit == 0) { 1440a5ed9182SOmar Sandoval total_found += add_new_free_space(block_group, 1441a5ed9182SOmar Sandoval extent_start, 1442a5ed9182SOmar Sandoval offset); 1443a5ed9182SOmar Sandoval if (total_found > CACHING_CTL_WAKE_UP) { 1444a5ed9182SOmar Sandoval total_found = 0; 1445a5ed9182SOmar Sandoval wake_up(&caching_ctl->wait); 1446a5ed9182SOmar Sandoval } 1447a5ed9182SOmar Sandoval extent_count++; 1448a5ed9182SOmar Sandoval } 1449a5ed9182SOmar Sandoval prev_bit = bit; 14500b246afaSJeff Mahoney offset += fs_info->sectorsize; 1451a5ed9182SOmar Sandoval } 1452a5ed9182SOmar Sandoval } 1453a5ed9182SOmar Sandoval if (prev_bit == 1) { 14544457c1c7SNikolay Borisov total_found += add_new_free_space(block_group, extent_start, 14554457c1c7SNikolay Borisov end); 1456a5ed9182SOmar Sandoval extent_count++; 1457a5ed9182SOmar Sandoval } 1458a5ed9182SOmar Sandoval 1459a5ed9182SOmar Sandoval if (extent_count != expected_extent_count) { 14605d163e0eSJeff Mahoney btrfs_err(fs_info, 14615d163e0eSJeff Mahoney "incorrect extent count for %llu; counted %u, expected %u", 1462b3470b5dSDavid Sterba block_group->start, extent_count, 1463a5ed9182SOmar Sandoval expected_extent_count); 1464a5ed9182SOmar Sandoval ASSERT(0); 1465a5ed9182SOmar Sandoval ret = -EIO; 1466a5ed9182SOmar Sandoval goto out; 1467a5ed9182SOmar Sandoval } 1468a5ed9182SOmar Sandoval 1469a5ed9182SOmar Sandoval caching_ctl->progress = (u64)-1; 1470a5ed9182SOmar Sandoval 1471a5ed9182SOmar Sandoval ret = 0; 1472a5ed9182SOmar Sandoval out: 1473a5ed9182SOmar Sandoval return ret; 1474a5ed9182SOmar Sandoval } 1475a5ed9182SOmar Sandoval 1476a5ed9182SOmar Sandoval static int load_free_space_extents(struct btrfs_caching_control *caching_ctl, 1477a5ed9182SOmar Sandoval struct btrfs_path *path, 1478a5ed9182SOmar Sandoval u32 expected_extent_count) 1479a5ed9182SOmar Sandoval { 148032da5386SDavid Sterba struct btrfs_block_group *block_group; 1481a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info; 1482a5ed9182SOmar Sandoval struct btrfs_root *root; 1483a5ed9182SOmar Sandoval struct btrfs_key key; 1484a5ed9182SOmar Sandoval u64 end; 1485a5ed9182SOmar Sandoval u64 total_found = 0; 1486a5ed9182SOmar Sandoval u32 extent_count = 0; 1487a5ed9182SOmar Sandoval int ret; 1488a5ed9182SOmar Sandoval 1489a5ed9182SOmar Sandoval block_group = caching_ctl->block_group; 1490a5ed9182SOmar Sandoval fs_info = block_group->fs_info; 1491a5ed9182SOmar Sandoval root = fs_info->free_space_root; 1492a5ed9182SOmar Sandoval 1493b3470b5dSDavid Sterba end = block_group->start + block_group->length; 1494a5ed9182SOmar Sandoval 1495a5ed9182SOmar Sandoval while (1) { 1496a5ed9182SOmar Sandoval ret = btrfs_next_item(root, path); 1497a5ed9182SOmar Sandoval if (ret < 0) 1498a5ed9182SOmar Sandoval goto out; 1499a5ed9182SOmar Sandoval if (ret) 1500a5ed9182SOmar Sandoval break; 1501a5ed9182SOmar Sandoval 1502a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 1503a5ed9182SOmar Sandoval 1504a5ed9182SOmar Sandoval if (key.type == BTRFS_FREE_SPACE_INFO_KEY) 1505a5ed9182SOmar Sandoval break; 1506a5ed9182SOmar Sandoval 1507a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_EXTENT_KEY); 1508a5ed9182SOmar Sandoval ASSERT(key.objectid < end && key.objectid + key.offset <= end); 1509a5ed9182SOmar Sandoval 1510a5ed9182SOmar Sandoval caching_ctl->progress = key.objectid; 1511a5ed9182SOmar Sandoval 15124457c1c7SNikolay Borisov total_found += add_new_free_space(block_group, key.objectid, 1513a5ed9182SOmar Sandoval key.objectid + key.offset); 1514a5ed9182SOmar Sandoval if (total_found > CACHING_CTL_WAKE_UP) { 1515a5ed9182SOmar Sandoval total_found = 0; 1516a5ed9182SOmar Sandoval wake_up(&caching_ctl->wait); 1517a5ed9182SOmar Sandoval } 1518a5ed9182SOmar Sandoval extent_count++; 1519a5ed9182SOmar Sandoval } 1520a5ed9182SOmar Sandoval 1521a5ed9182SOmar Sandoval if (extent_count != expected_extent_count) { 15225d163e0eSJeff Mahoney btrfs_err(fs_info, 15235d163e0eSJeff Mahoney "incorrect extent count for %llu; counted %u, expected %u", 1524b3470b5dSDavid Sterba block_group->start, extent_count, 1525a5ed9182SOmar Sandoval expected_extent_count); 1526a5ed9182SOmar Sandoval ASSERT(0); 1527a5ed9182SOmar Sandoval ret = -EIO; 1528a5ed9182SOmar Sandoval goto out; 1529a5ed9182SOmar Sandoval } 1530a5ed9182SOmar Sandoval 1531a5ed9182SOmar Sandoval caching_ctl->progress = (u64)-1; 1532a5ed9182SOmar Sandoval 1533a5ed9182SOmar Sandoval ret = 0; 1534a5ed9182SOmar Sandoval out: 1535a5ed9182SOmar Sandoval return ret; 1536a5ed9182SOmar Sandoval } 1537a5ed9182SOmar Sandoval 1538a5ed9182SOmar Sandoval int load_free_space_tree(struct btrfs_caching_control *caching_ctl) 1539a5ed9182SOmar Sandoval { 154032da5386SDavid Sterba struct btrfs_block_group *block_group; 1541a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 1542a5ed9182SOmar Sandoval struct btrfs_path *path; 1543a5ed9182SOmar Sandoval u32 extent_count, flags; 1544a5ed9182SOmar Sandoval int ret; 1545a5ed9182SOmar Sandoval 1546a5ed9182SOmar Sandoval block_group = caching_ctl->block_group; 1547a5ed9182SOmar Sandoval 1548a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1549a5ed9182SOmar Sandoval if (!path) 1550a5ed9182SOmar Sandoval return -ENOMEM; 1551a5ed9182SOmar Sandoval 1552a5ed9182SOmar Sandoval /* 1553a5ed9182SOmar Sandoval * Just like caching_thread() doesn't want to deadlock on the extent 1554a5ed9182SOmar Sandoval * tree, we don't want to deadlock on the free space tree. 1555a5ed9182SOmar Sandoval */ 1556a5ed9182SOmar Sandoval path->skip_locking = 1; 1557a5ed9182SOmar Sandoval path->search_commit_root = 1; 15587ce311d5SGu JinXiang path->reada = READA_FORWARD; 1559a5ed9182SOmar Sandoval 15602ccf545eSDavid Sterba info = search_free_space_info(NULL, block_group, path, 0); 1561a5ed9182SOmar Sandoval if (IS_ERR(info)) { 1562a5ed9182SOmar Sandoval ret = PTR_ERR(info); 1563a5ed9182SOmar Sandoval goto out; 1564a5ed9182SOmar Sandoval } 1565a5ed9182SOmar Sandoval extent_count = btrfs_free_space_extent_count(path->nodes[0], info); 1566a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(path->nodes[0], info); 1567a5ed9182SOmar Sandoval 1568a5ed9182SOmar Sandoval /* 1569a5ed9182SOmar Sandoval * We left path pointing to the free space info item, so now 1570a5ed9182SOmar Sandoval * load_free_space_foo can just iterate through the free space tree from 1571a5ed9182SOmar Sandoval * there. 1572a5ed9182SOmar Sandoval */ 1573a5ed9182SOmar Sandoval if (flags & BTRFS_FREE_SPACE_USING_BITMAPS) 1574a5ed9182SOmar Sandoval ret = load_free_space_bitmaps(caching_ctl, path, extent_count); 1575a5ed9182SOmar Sandoval else 1576a5ed9182SOmar Sandoval ret = load_free_space_extents(caching_ctl, path, extent_count); 1577a5ed9182SOmar Sandoval 1578a5ed9182SOmar Sandoval out: 1579a5ed9182SOmar Sandoval btrfs_free_path(path); 1580a5ed9182SOmar Sandoval return ret; 1581a5ed9182SOmar Sandoval } 1582