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, 16a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group, 17a5ed9182SOmar Sandoval struct btrfs_path *path); 18a5ed9182SOmar Sandoval 19a5ed9182SOmar Sandoval void set_free_space_tree_thresholds(struct btrfs_block_group_cache *cache) 20a5ed9182SOmar Sandoval { 21a5ed9182SOmar Sandoval u32 bitmap_range; 22a5ed9182SOmar Sandoval size_t bitmap_size; 23a5ed9182SOmar Sandoval u64 num_bitmaps, total_bitmap_size; 24a5ed9182SOmar Sandoval 25a5ed9182SOmar Sandoval /* 26a5ed9182SOmar Sandoval * We convert to bitmaps when the disk space required for using extents 27a5ed9182SOmar Sandoval * exceeds that required for using bitmaps. 28a5ed9182SOmar Sandoval */ 29da17066cSJeff Mahoney bitmap_range = cache->fs_info->sectorsize * BTRFS_FREE_SPACE_BITMAP_BITS; 30b3470b5dSDavid Sterba num_bitmaps = div_u64(cache->length + bitmap_range - 1, bitmap_range); 31a5ed9182SOmar Sandoval bitmap_size = sizeof(struct btrfs_item) + BTRFS_FREE_SPACE_BITMAP_SIZE; 32a5ed9182SOmar Sandoval total_bitmap_size = num_bitmaps * bitmap_size; 33a5ed9182SOmar Sandoval cache->bitmap_high_thresh = div_u64(total_bitmap_size, 34a5ed9182SOmar Sandoval sizeof(struct btrfs_item)); 35a5ed9182SOmar Sandoval 36a5ed9182SOmar Sandoval /* 37a5ed9182SOmar Sandoval * We allow for a small buffer between the high threshold and low 38a5ed9182SOmar Sandoval * threshold to avoid thrashing back and forth between the two formats. 39a5ed9182SOmar Sandoval */ 40a5ed9182SOmar Sandoval if (cache->bitmap_high_thresh > 100) 41a5ed9182SOmar Sandoval cache->bitmap_low_thresh = cache->bitmap_high_thresh - 100; 42a5ed9182SOmar Sandoval else 43a5ed9182SOmar Sandoval cache->bitmap_low_thresh = 0; 44a5ed9182SOmar Sandoval } 45a5ed9182SOmar Sandoval 46a5ed9182SOmar Sandoval static int add_new_free_space_info(struct btrfs_trans_handle *trans, 47a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group, 48a5ed9182SOmar Sandoval struct btrfs_path *path) 49a5ed9182SOmar Sandoval { 5066afee18SNikolay Borisov struct btrfs_root *root = trans->fs_info->free_space_root; 51a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 52a5ed9182SOmar Sandoval struct btrfs_key key; 53a5ed9182SOmar Sandoval struct extent_buffer *leaf; 54a5ed9182SOmar Sandoval int ret; 55a5ed9182SOmar Sandoval 56b3470b5dSDavid Sterba key.objectid = block_group->start; 57a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_INFO_KEY; 58b3470b5dSDavid Sterba key.offset = block_group->length; 59a5ed9182SOmar Sandoval 60a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(*info)); 61a5ed9182SOmar Sandoval if (ret) 62a5ed9182SOmar Sandoval goto out; 63a5ed9182SOmar Sandoval 64a5ed9182SOmar Sandoval leaf = path->nodes[0]; 65a5ed9182SOmar Sandoval info = btrfs_item_ptr(leaf, path->slots[0], 66a5ed9182SOmar Sandoval struct btrfs_free_space_info); 67a5ed9182SOmar Sandoval btrfs_set_free_space_extent_count(leaf, info, 0); 68a5ed9182SOmar Sandoval btrfs_set_free_space_flags(leaf, info, 0); 69a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 70a5ed9182SOmar Sandoval 71a5ed9182SOmar Sandoval ret = 0; 72a5ed9182SOmar Sandoval out: 73a5ed9182SOmar Sandoval btrfs_release_path(path); 74a5ed9182SOmar Sandoval return ret; 75a5ed9182SOmar Sandoval } 76a5ed9182SOmar Sandoval 77ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 78ce9f967fSJohannes Thumshirn struct btrfs_free_space_info *search_free_space_info( 792ccf545eSDavid Sterba struct btrfs_trans_handle *trans, 80a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group, 81a5ed9182SOmar Sandoval struct btrfs_path *path, int cow) 82a5ed9182SOmar Sandoval { 832ccf545eSDavid Sterba struct btrfs_fs_info *fs_info = block_group->fs_info; 84a5ed9182SOmar Sandoval struct btrfs_root *root = fs_info->free_space_root; 85a5ed9182SOmar Sandoval struct btrfs_key key; 86a5ed9182SOmar Sandoval int ret; 87a5ed9182SOmar Sandoval 88b3470b5dSDavid Sterba key.objectid = block_group->start; 89a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_INFO_KEY; 90b3470b5dSDavid Sterba key.offset = block_group->length; 91a5ed9182SOmar Sandoval 92a5ed9182SOmar Sandoval ret = btrfs_search_slot(trans, root, &key, path, 0, cow); 93a5ed9182SOmar Sandoval if (ret < 0) 94a5ed9182SOmar Sandoval return ERR_PTR(ret); 95a5ed9182SOmar Sandoval if (ret != 0) { 96ab8d0fc4SJeff Mahoney btrfs_warn(fs_info, "missing free space info for %llu", 97b3470b5dSDavid Sterba block_group->start); 98a5ed9182SOmar Sandoval ASSERT(0); 99a5ed9182SOmar Sandoval return ERR_PTR(-ENOENT); 100a5ed9182SOmar Sandoval } 101a5ed9182SOmar Sandoval 102a5ed9182SOmar Sandoval return btrfs_item_ptr(path->nodes[0], path->slots[0], 103a5ed9182SOmar Sandoval struct btrfs_free_space_info); 104a5ed9182SOmar Sandoval } 105a5ed9182SOmar Sandoval 106a5ed9182SOmar Sandoval /* 107a5ed9182SOmar Sandoval * btrfs_search_slot() but we're looking for the greatest key less than the 108a5ed9182SOmar Sandoval * passed key. 109a5ed9182SOmar Sandoval */ 110a5ed9182SOmar Sandoval static int btrfs_search_prev_slot(struct btrfs_trans_handle *trans, 111a5ed9182SOmar Sandoval struct btrfs_root *root, 112a5ed9182SOmar Sandoval struct btrfs_key *key, struct btrfs_path *p, 113a5ed9182SOmar Sandoval int ins_len, int cow) 114a5ed9182SOmar Sandoval { 115a5ed9182SOmar Sandoval int ret; 116a5ed9182SOmar Sandoval 117a5ed9182SOmar Sandoval ret = btrfs_search_slot(trans, root, key, p, ins_len, cow); 118a5ed9182SOmar Sandoval if (ret < 0) 119a5ed9182SOmar Sandoval return ret; 120a5ed9182SOmar Sandoval 121a5ed9182SOmar Sandoval if (ret == 0) { 122a5ed9182SOmar Sandoval ASSERT(0); 123a5ed9182SOmar Sandoval return -EIO; 124a5ed9182SOmar Sandoval } 125a5ed9182SOmar Sandoval 126a5ed9182SOmar Sandoval if (p->slots[0] == 0) { 127a5ed9182SOmar Sandoval ASSERT(0); 128a5ed9182SOmar Sandoval return -EIO; 129a5ed9182SOmar Sandoval } 130a5ed9182SOmar Sandoval p->slots[0]--; 131a5ed9182SOmar Sandoval 132a5ed9182SOmar Sandoval return 0; 133a5ed9182SOmar Sandoval } 134a5ed9182SOmar Sandoval 135a5ed9182SOmar Sandoval static inline u32 free_space_bitmap_size(u64 size, u32 sectorsize) 136a5ed9182SOmar Sandoval { 137a5ed9182SOmar Sandoval return DIV_ROUND_UP((u32)div_u64(size, sectorsize), BITS_PER_BYTE); 138a5ed9182SOmar Sandoval } 139a5ed9182SOmar Sandoval 140a565971fSHoward McLauchlan static unsigned long *alloc_bitmap(u32 bitmap_size) 141a5ed9182SOmar Sandoval { 142a565971fSHoward McLauchlan unsigned long *ret; 14325ff17e8SOmar Sandoval unsigned int nofs_flag; 144a565971fSHoward McLauchlan u32 bitmap_rounded_size = round_up(bitmap_size, sizeof(unsigned long)); 14579b134a2SDavid Sterba 14679b134a2SDavid Sterba /* 14725ff17e8SOmar Sandoval * GFP_NOFS doesn't work with kvmalloc(), but we really can't recurse 14825ff17e8SOmar Sandoval * into the filesystem as the free space bitmap can be modified in the 14925ff17e8SOmar Sandoval * critical section of a transaction commit. 15025ff17e8SOmar Sandoval * 15125ff17e8SOmar Sandoval * TODO: push the memalloc_nofs_{save,restore}() to the caller where we 15225ff17e8SOmar Sandoval * know that recursion is unsafe. 15379b134a2SDavid Sterba */ 15425ff17e8SOmar Sandoval nofs_flag = memalloc_nofs_save(); 155a565971fSHoward McLauchlan ret = kvzalloc(bitmap_rounded_size, GFP_KERNEL); 15625ff17e8SOmar Sandoval memalloc_nofs_restore(nofs_flag); 15725ff17e8SOmar Sandoval return ret; 158a5ed9182SOmar Sandoval } 159a5ed9182SOmar Sandoval 160a565971fSHoward McLauchlan static void le_bitmap_set(unsigned long *map, unsigned int start, int len) 1616faa8f47SHoward McLauchlan { 162a565971fSHoward McLauchlan u8 *p = ((u8 *)map) + BIT_BYTE(start); 1636faa8f47SHoward McLauchlan const unsigned int size = start + len; 1646faa8f47SHoward McLauchlan int bits_to_set = BITS_PER_BYTE - (start % BITS_PER_BYTE); 1656faa8f47SHoward McLauchlan u8 mask_to_set = BITMAP_FIRST_BYTE_MASK(start); 1666faa8f47SHoward McLauchlan 1676faa8f47SHoward McLauchlan while (len - bits_to_set >= 0) { 1686faa8f47SHoward McLauchlan *p |= mask_to_set; 1696faa8f47SHoward McLauchlan len -= bits_to_set; 1706faa8f47SHoward McLauchlan bits_to_set = BITS_PER_BYTE; 1716faa8f47SHoward McLauchlan mask_to_set = ~0; 1726faa8f47SHoward McLauchlan p++; 1736faa8f47SHoward McLauchlan } 1746faa8f47SHoward McLauchlan if (len) { 1756faa8f47SHoward McLauchlan mask_to_set &= BITMAP_LAST_BYTE_MASK(size); 1766faa8f47SHoward McLauchlan *p |= mask_to_set; 1776faa8f47SHoward McLauchlan } 1786faa8f47SHoward McLauchlan } 1796faa8f47SHoward McLauchlan 180ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 181a5ed9182SOmar Sandoval int convert_free_space_to_bitmaps(struct btrfs_trans_handle *trans, 182a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group, 183a5ed9182SOmar Sandoval struct btrfs_path *path) 184a5ed9182SOmar Sandoval { 185719fb4deSNikolay Borisov struct btrfs_fs_info *fs_info = trans->fs_info; 186a5ed9182SOmar Sandoval struct btrfs_root *root = fs_info->free_space_root; 187a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 188a5ed9182SOmar Sandoval struct btrfs_key key, found_key; 189a5ed9182SOmar Sandoval struct extent_buffer *leaf; 190a565971fSHoward McLauchlan unsigned long *bitmap; 191a565971fSHoward McLauchlan char *bitmap_cursor; 192a5ed9182SOmar Sandoval u64 start, end; 193a5ed9182SOmar Sandoval u64 bitmap_range, i; 194a5ed9182SOmar Sandoval u32 bitmap_size, flags, expected_extent_count; 195a5ed9182SOmar Sandoval u32 extent_count = 0; 196a5ed9182SOmar Sandoval int done = 0, nr; 197a5ed9182SOmar Sandoval int ret; 198a5ed9182SOmar Sandoval 199b3470b5dSDavid Sterba bitmap_size = free_space_bitmap_size(block_group->length, 2000b246afaSJeff Mahoney fs_info->sectorsize); 201a5ed9182SOmar Sandoval bitmap = alloc_bitmap(bitmap_size); 202a5ed9182SOmar Sandoval if (!bitmap) { 203a5ed9182SOmar Sandoval ret = -ENOMEM; 204a5ed9182SOmar Sandoval goto out; 205a5ed9182SOmar Sandoval } 206a5ed9182SOmar Sandoval 207b3470b5dSDavid Sterba start = block_group->start; 208b3470b5dSDavid Sterba end = block_group->start + block_group->length; 209a5ed9182SOmar Sandoval 210a5ed9182SOmar Sandoval key.objectid = end - 1; 211a5ed9182SOmar Sandoval key.type = (u8)-1; 212a5ed9182SOmar Sandoval key.offset = (u64)-1; 213a5ed9182SOmar Sandoval 214a5ed9182SOmar Sandoval while (!done) { 215a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 216a5ed9182SOmar Sandoval if (ret) 217a5ed9182SOmar Sandoval goto out; 218a5ed9182SOmar Sandoval 219a5ed9182SOmar Sandoval leaf = path->nodes[0]; 220a5ed9182SOmar Sandoval nr = 0; 221a5ed9182SOmar Sandoval path->slots[0]++; 222a5ed9182SOmar Sandoval while (path->slots[0] > 0) { 223a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0] - 1); 224a5ed9182SOmar Sandoval 225a5ed9182SOmar Sandoval if (found_key.type == BTRFS_FREE_SPACE_INFO_KEY) { 226b3470b5dSDavid Sterba ASSERT(found_key.objectid == block_group->start); 227b3470b5dSDavid Sterba ASSERT(found_key.offset == block_group->length); 228a5ed9182SOmar Sandoval done = 1; 229a5ed9182SOmar Sandoval break; 230a5ed9182SOmar Sandoval } else if (found_key.type == BTRFS_FREE_SPACE_EXTENT_KEY) { 231a5ed9182SOmar Sandoval u64 first, last; 232a5ed9182SOmar Sandoval 233a5ed9182SOmar Sandoval ASSERT(found_key.objectid >= start); 234a5ed9182SOmar Sandoval ASSERT(found_key.objectid < end); 235a5ed9182SOmar Sandoval ASSERT(found_key.objectid + found_key.offset <= end); 236a5ed9182SOmar Sandoval 237a5ed9182SOmar Sandoval first = div_u64(found_key.objectid - start, 2380b246afaSJeff Mahoney fs_info->sectorsize); 239a5ed9182SOmar Sandoval last = div_u64(found_key.objectid + found_key.offset - start, 2400b246afaSJeff Mahoney fs_info->sectorsize); 2412fe1d551SOmar Sandoval le_bitmap_set(bitmap, first, last - first); 242a5ed9182SOmar Sandoval 243a5ed9182SOmar Sandoval extent_count++; 244a5ed9182SOmar Sandoval nr++; 245a5ed9182SOmar Sandoval path->slots[0]--; 246a5ed9182SOmar Sandoval } else { 247a5ed9182SOmar Sandoval ASSERT(0); 248a5ed9182SOmar Sandoval } 249a5ed9182SOmar Sandoval } 250a5ed9182SOmar Sandoval 251a5ed9182SOmar Sandoval ret = btrfs_del_items(trans, root, path, path->slots[0], nr); 252a5ed9182SOmar Sandoval if (ret) 253a5ed9182SOmar Sandoval goto out; 254a5ed9182SOmar Sandoval btrfs_release_path(path); 255a5ed9182SOmar Sandoval } 256a5ed9182SOmar Sandoval 2572ccf545eSDavid Sterba info = search_free_space_info(trans, block_group, path, 1); 258a5ed9182SOmar Sandoval if (IS_ERR(info)) { 259a5ed9182SOmar Sandoval ret = PTR_ERR(info); 260a5ed9182SOmar Sandoval goto out; 261a5ed9182SOmar Sandoval } 262a5ed9182SOmar Sandoval leaf = path->nodes[0]; 263a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(leaf, info); 264a5ed9182SOmar Sandoval flags |= BTRFS_FREE_SPACE_USING_BITMAPS; 265a5ed9182SOmar Sandoval btrfs_set_free_space_flags(leaf, info, flags); 266a5ed9182SOmar Sandoval expected_extent_count = btrfs_free_space_extent_count(leaf, info); 267a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 268a5ed9182SOmar Sandoval btrfs_release_path(path); 269a5ed9182SOmar Sandoval 270a5ed9182SOmar Sandoval if (extent_count != expected_extent_count) { 2715d163e0eSJeff Mahoney btrfs_err(fs_info, 2725d163e0eSJeff Mahoney "incorrect extent count for %llu; counted %u, expected %u", 273b3470b5dSDavid Sterba block_group->start, extent_count, 274a5ed9182SOmar Sandoval expected_extent_count); 275a5ed9182SOmar Sandoval ASSERT(0); 276a5ed9182SOmar Sandoval ret = -EIO; 277a5ed9182SOmar Sandoval goto out; 278a5ed9182SOmar Sandoval } 279a5ed9182SOmar Sandoval 280a565971fSHoward McLauchlan bitmap_cursor = (char *)bitmap; 2810b246afaSJeff Mahoney bitmap_range = fs_info->sectorsize * BTRFS_FREE_SPACE_BITMAP_BITS; 282a5ed9182SOmar Sandoval i = start; 283a5ed9182SOmar Sandoval while (i < end) { 284a5ed9182SOmar Sandoval unsigned long ptr; 285a5ed9182SOmar Sandoval u64 extent_size; 286a5ed9182SOmar Sandoval u32 data_size; 287a5ed9182SOmar Sandoval 288a5ed9182SOmar Sandoval extent_size = min(end - i, bitmap_range); 289a5ed9182SOmar Sandoval data_size = free_space_bitmap_size(extent_size, 2900b246afaSJeff Mahoney fs_info->sectorsize); 291a5ed9182SOmar Sandoval 292a5ed9182SOmar Sandoval key.objectid = i; 293a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_BITMAP_KEY; 294a5ed9182SOmar Sandoval key.offset = extent_size; 295a5ed9182SOmar Sandoval 296a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, 297a5ed9182SOmar Sandoval data_size); 298a5ed9182SOmar Sandoval if (ret) 299a5ed9182SOmar Sandoval goto out; 300a5ed9182SOmar Sandoval 301a5ed9182SOmar Sandoval leaf = path->nodes[0]; 302a5ed9182SOmar Sandoval ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); 303a5ed9182SOmar Sandoval write_extent_buffer(leaf, bitmap_cursor, ptr, 304a5ed9182SOmar Sandoval data_size); 305a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 306a5ed9182SOmar Sandoval btrfs_release_path(path); 307a5ed9182SOmar Sandoval 308a5ed9182SOmar Sandoval i += extent_size; 309a5ed9182SOmar Sandoval bitmap_cursor += data_size; 310a5ed9182SOmar Sandoval } 311a5ed9182SOmar Sandoval 312a5ed9182SOmar Sandoval ret = 0; 313a5ed9182SOmar Sandoval out: 31479b134a2SDavid Sterba kvfree(bitmap); 315a5ed9182SOmar Sandoval if (ret) 31666642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 317a5ed9182SOmar Sandoval return ret; 318a5ed9182SOmar Sandoval } 319a5ed9182SOmar Sandoval 320ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 321a5ed9182SOmar Sandoval int convert_free_space_to_extents(struct btrfs_trans_handle *trans, 322a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group, 323a5ed9182SOmar Sandoval struct btrfs_path *path) 324a5ed9182SOmar Sandoval { 3255296c2bfSNikolay Borisov struct btrfs_fs_info *fs_info = trans->fs_info; 326a5ed9182SOmar Sandoval struct btrfs_root *root = fs_info->free_space_root; 327a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 328a5ed9182SOmar Sandoval struct btrfs_key key, found_key; 329a5ed9182SOmar Sandoval struct extent_buffer *leaf; 330a565971fSHoward McLauchlan unsigned long *bitmap; 331a5ed9182SOmar Sandoval u64 start, end; 332a5ed9182SOmar Sandoval u32 bitmap_size, flags, expected_extent_count; 333a565971fSHoward McLauchlan unsigned long nrbits, start_bit, end_bit; 334a5ed9182SOmar Sandoval u32 extent_count = 0; 335a5ed9182SOmar Sandoval int done = 0, nr; 336a5ed9182SOmar Sandoval int ret; 337a5ed9182SOmar Sandoval 338b3470b5dSDavid Sterba bitmap_size = free_space_bitmap_size(block_group->length, 3390b246afaSJeff Mahoney fs_info->sectorsize); 340a5ed9182SOmar Sandoval bitmap = alloc_bitmap(bitmap_size); 341a5ed9182SOmar Sandoval if (!bitmap) { 342a5ed9182SOmar Sandoval ret = -ENOMEM; 343a5ed9182SOmar Sandoval goto out; 344a5ed9182SOmar Sandoval } 345a5ed9182SOmar Sandoval 346b3470b5dSDavid Sterba start = block_group->start; 347b3470b5dSDavid Sterba end = block_group->start + block_group->length; 348a5ed9182SOmar Sandoval 349a5ed9182SOmar Sandoval key.objectid = end - 1; 350a5ed9182SOmar Sandoval key.type = (u8)-1; 351a5ed9182SOmar Sandoval key.offset = (u64)-1; 352a5ed9182SOmar Sandoval 353a5ed9182SOmar Sandoval while (!done) { 354a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 355a5ed9182SOmar Sandoval if (ret) 356a5ed9182SOmar Sandoval goto out; 357a5ed9182SOmar Sandoval 358a5ed9182SOmar Sandoval leaf = path->nodes[0]; 359a5ed9182SOmar Sandoval nr = 0; 360a5ed9182SOmar Sandoval path->slots[0]++; 361a5ed9182SOmar Sandoval while (path->slots[0] > 0) { 362a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0] - 1); 363a5ed9182SOmar Sandoval 364a5ed9182SOmar Sandoval if (found_key.type == BTRFS_FREE_SPACE_INFO_KEY) { 365b3470b5dSDavid Sterba ASSERT(found_key.objectid == block_group->start); 366b3470b5dSDavid Sterba ASSERT(found_key.offset == block_group->length); 367a5ed9182SOmar Sandoval done = 1; 368a5ed9182SOmar Sandoval break; 369a5ed9182SOmar Sandoval } else if (found_key.type == BTRFS_FREE_SPACE_BITMAP_KEY) { 370a5ed9182SOmar Sandoval unsigned long ptr; 371a565971fSHoward McLauchlan char *bitmap_cursor; 372a5ed9182SOmar Sandoval u32 bitmap_pos, data_size; 373a5ed9182SOmar Sandoval 374a5ed9182SOmar Sandoval ASSERT(found_key.objectid >= start); 375a5ed9182SOmar Sandoval ASSERT(found_key.objectid < end); 376a5ed9182SOmar Sandoval ASSERT(found_key.objectid + found_key.offset <= end); 377a5ed9182SOmar Sandoval 378a5ed9182SOmar Sandoval bitmap_pos = div_u64(found_key.objectid - start, 3790b246afaSJeff Mahoney fs_info->sectorsize * 380a5ed9182SOmar Sandoval BITS_PER_BYTE); 381a565971fSHoward McLauchlan bitmap_cursor = ((char *)bitmap) + bitmap_pos; 382a5ed9182SOmar Sandoval data_size = free_space_bitmap_size(found_key.offset, 3830b246afaSJeff Mahoney fs_info->sectorsize); 384a5ed9182SOmar Sandoval 385a5ed9182SOmar Sandoval ptr = btrfs_item_ptr_offset(leaf, path->slots[0] - 1); 386a5ed9182SOmar Sandoval read_extent_buffer(leaf, bitmap_cursor, ptr, 387a5ed9182SOmar Sandoval data_size); 388a5ed9182SOmar Sandoval 389a5ed9182SOmar Sandoval nr++; 390a5ed9182SOmar Sandoval path->slots[0]--; 391a5ed9182SOmar Sandoval } else { 392a5ed9182SOmar Sandoval ASSERT(0); 393a5ed9182SOmar Sandoval } 394a5ed9182SOmar Sandoval } 395a5ed9182SOmar Sandoval 396a5ed9182SOmar Sandoval ret = btrfs_del_items(trans, root, path, path->slots[0], nr); 397a5ed9182SOmar Sandoval if (ret) 398a5ed9182SOmar Sandoval goto out; 399a5ed9182SOmar Sandoval btrfs_release_path(path); 400a5ed9182SOmar Sandoval } 401a5ed9182SOmar Sandoval 4022ccf545eSDavid Sterba info = search_free_space_info(trans, block_group, path, 1); 403a5ed9182SOmar Sandoval if (IS_ERR(info)) { 404a5ed9182SOmar Sandoval ret = PTR_ERR(info); 405a5ed9182SOmar Sandoval goto out; 406a5ed9182SOmar Sandoval } 407a5ed9182SOmar Sandoval leaf = path->nodes[0]; 408a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(leaf, info); 409a5ed9182SOmar Sandoval flags &= ~BTRFS_FREE_SPACE_USING_BITMAPS; 410a5ed9182SOmar Sandoval btrfs_set_free_space_flags(leaf, info, flags); 411a5ed9182SOmar Sandoval expected_extent_count = btrfs_free_space_extent_count(leaf, info); 412a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 413a5ed9182SOmar Sandoval btrfs_release_path(path); 414a5ed9182SOmar Sandoval 415b3470b5dSDavid Sterba nrbits = div_u64(block_group->length, block_group->fs_info->sectorsize); 416a565971fSHoward McLauchlan start_bit = find_next_bit_le(bitmap, nrbits, 0); 417a565971fSHoward McLauchlan 418a565971fSHoward McLauchlan while (start_bit < nrbits) { 419a565971fSHoward McLauchlan end_bit = find_next_zero_bit_le(bitmap, nrbits, start_bit); 420a565971fSHoward McLauchlan ASSERT(start_bit < end_bit); 421a565971fSHoward McLauchlan 422a565971fSHoward McLauchlan key.objectid = start + start_bit * block_group->fs_info->sectorsize; 423a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_EXTENT_KEY; 424a565971fSHoward McLauchlan key.offset = (end_bit - start_bit) * block_group->fs_info->sectorsize; 425a5ed9182SOmar Sandoval 426a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, 0); 427a5ed9182SOmar Sandoval if (ret) 428a5ed9182SOmar Sandoval goto out; 429a5ed9182SOmar Sandoval btrfs_release_path(path); 430a5ed9182SOmar Sandoval 431a5ed9182SOmar Sandoval extent_count++; 432a5ed9182SOmar Sandoval 433a565971fSHoward McLauchlan start_bit = find_next_bit_le(bitmap, nrbits, end_bit); 434a5ed9182SOmar Sandoval } 435a5ed9182SOmar Sandoval 436a5ed9182SOmar Sandoval if (extent_count != expected_extent_count) { 4375d163e0eSJeff Mahoney btrfs_err(fs_info, 4385d163e0eSJeff Mahoney "incorrect extent count for %llu; counted %u, expected %u", 439b3470b5dSDavid Sterba block_group->start, extent_count, 440a5ed9182SOmar Sandoval expected_extent_count); 441a5ed9182SOmar Sandoval ASSERT(0); 442a5ed9182SOmar Sandoval ret = -EIO; 443a5ed9182SOmar Sandoval goto out; 444a5ed9182SOmar Sandoval } 445a5ed9182SOmar Sandoval 446a5ed9182SOmar Sandoval ret = 0; 447a5ed9182SOmar Sandoval out: 44879b134a2SDavid Sterba kvfree(bitmap); 449a5ed9182SOmar Sandoval if (ret) 45066642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 451a5ed9182SOmar Sandoval return ret; 452a5ed9182SOmar Sandoval } 453a5ed9182SOmar Sandoval 454a5ed9182SOmar Sandoval static int update_free_space_extent_count(struct btrfs_trans_handle *trans, 455a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group, 456a5ed9182SOmar Sandoval struct btrfs_path *path, 457a5ed9182SOmar Sandoval int new_extents) 458a5ed9182SOmar Sandoval { 459a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 460a5ed9182SOmar Sandoval u32 flags; 461a5ed9182SOmar Sandoval u32 extent_count; 462a5ed9182SOmar Sandoval int ret = 0; 463a5ed9182SOmar Sandoval 464a5ed9182SOmar Sandoval if (new_extents == 0) 465a5ed9182SOmar Sandoval return 0; 466a5ed9182SOmar Sandoval 4672ccf545eSDavid Sterba info = search_free_space_info(trans, block_group, path, 1); 468a5ed9182SOmar Sandoval if (IS_ERR(info)) { 469a5ed9182SOmar Sandoval ret = PTR_ERR(info); 470a5ed9182SOmar Sandoval goto out; 471a5ed9182SOmar Sandoval } 472a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(path->nodes[0], info); 473a5ed9182SOmar Sandoval extent_count = btrfs_free_space_extent_count(path->nodes[0], info); 474a5ed9182SOmar Sandoval 475a5ed9182SOmar Sandoval extent_count += new_extents; 476a5ed9182SOmar Sandoval btrfs_set_free_space_extent_count(path->nodes[0], info, extent_count); 477a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(path->nodes[0]); 478a5ed9182SOmar Sandoval btrfs_release_path(path); 479a5ed9182SOmar Sandoval 480a5ed9182SOmar Sandoval if (!(flags & BTRFS_FREE_SPACE_USING_BITMAPS) && 481a5ed9182SOmar Sandoval extent_count > block_group->bitmap_high_thresh) { 482719fb4deSNikolay Borisov ret = convert_free_space_to_bitmaps(trans, block_group, path); 483a5ed9182SOmar Sandoval } else if ((flags & BTRFS_FREE_SPACE_USING_BITMAPS) && 484a5ed9182SOmar Sandoval extent_count < block_group->bitmap_low_thresh) { 4855296c2bfSNikolay Borisov ret = convert_free_space_to_extents(trans, block_group, path); 486a5ed9182SOmar Sandoval } 487a5ed9182SOmar Sandoval 488a5ed9182SOmar Sandoval out: 489a5ed9182SOmar Sandoval return ret; 490a5ed9182SOmar Sandoval } 491a5ed9182SOmar Sandoval 492ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 493a5ed9182SOmar Sandoval int free_space_test_bit(struct btrfs_block_group_cache *block_group, 494a5ed9182SOmar Sandoval struct btrfs_path *path, u64 offset) 495a5ed9182SOmar Sandoval { 496a5ed9182SOmar Sandoval struct extent_buffer *leaf; 497a5ed9182SOmar Sandoval struct btrfs_key key; 498a5ed9182SOmar Sandoval u64 found_start, found_end; 499a5ed9182SOmar Sandoval unsigned long ptr, i; 500a5ed9182SOmar Sandoval 501a5ed9182SOmar Sandoval leaf = path->nodes[0]; 502a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); 503a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_BITMAP_KEY); 504a5ed9182SOmar Sandoval 505a5ed9182SOmar Sandoval found_start = key.objectid; 506a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 507a5ed9182SOmar Sandoval ASSERT(offset >= found_start && offset < found_end); 508a5ed9182SOmar Sandoval 509a5ed9182SOmar Sandoval ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); 510da17066cSJeff Mahoney i = div_u64(offset - found_start, 511da17066cSJeff Mahoney block_group->fs_info->sectorsize); 512a5ed9182SOmar Sandoval return !!extent_buffer_test_bit(leaf, ptr, i); 513a5ed9182SOmar Sandoval } 514a5ed9182SOmar Sandoval 515a5ed9182SOmar Sandoval static void free_space_set_bits(struct btrfs_block_group_cache *block_group, 516a5ed9182SOmar Sandoval struct btrfs_path *path, u64 *start, u64 *size, 517a5ed9182SOmar Sandoval int bit) 518a5ed9182SOmar Sandoval { 5190b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = block_group->fs_info; 520a5ed9182SOmar Sandoval struct extent_buffer *leaf; 521a5ed9182SOmar Sandoval struct btrfs_key key; 522a5ed9182SOmar Sandoval u64 end = *start + *size; 523a5ed9182SOmar Sandoval u64 found_start, found_end; 524a5ed9182SOmar Sandoval unsigned long ptr, first, last; 525a5ed9182SOmar Sandoval 526a5ed9182SOmar Sandoval leaf = path->nodes[0]; 527a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); 528a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_BITMAP_KEY); 529a5ed9182SOmar Sandoval 530a5ed9182SOmar Sandoval found_start = key.objectid; 531a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 532a5ed9182SOmar Sandoval ASSERT(*start >= found_start && *start < found_end); 533a5ed9182SOmar Sandoval ASSERT(end > found_start); 534a5ed9182SOmar Sandoval 535a5ed9182SOmar Sandoval if (end > found_end) 536a5ed9182SOmar Sandoval end = found_end; 537a5ed9182SOmar Sandoval 538a5ed9182SOmar Sandoval ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); 5390b246afaSJeff Mahoney first = div_u64(*start - found_start, fs_info->sectorsize); 5400b246afaSJeff Mahoney last = div_u64(end - found_start, fs_info->sectorsize); 541a5ed9182SOmar Sandoval if (bit) 542a5ed9182SOmar Sandoval extent_buffer_bitmap_set(leaf, ptr, first, last - first); 543a5ed9182SOmar Sandoval else 544a5ed9182SOmar Sandoval extent_buffer_bitmap_clear(leaf, ptr, first, last - first); 545a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 546a5ed9182SOmar Sandoval 547a5ed9182SOmar Sandoval *size -= end - *start; 548a5ed9182SOmar Sandoval *start = end; 549a5ed9182SOmar Sandoval } 550a5ed9182SOmar Sandoval 551a5ed9182SOmar Sandoval /* 552a5ed9182SOmar Sandoval * We can't use btrfs_next_item() in modify_free_space_bitmap() because 553a5ed9182SOmar Sandoval * btrfs_next_leaf() doesn't get the path for writing. We can forgo the fancy 554a5ed9182SOmar Sandoval * tree walking in btrfs_next_leaf() anyways because we know exactly what we're 555a5ed9182SOmar Sandoval * looking for. 556a5ed9182SOmar Sandoval */ 557a5ed9182SOmar Sandoval static int free_space_next_bitmap(struct btrfs_trans_handle *trans, 558a5ed9182SOmar Sandoval struct btrfs_root *root, struct btrfs_path *p) 559a5ed9182SOmar Sandoval { 560a5ed9182SOmar Sandoval struct btrfs_key key; 561a5ed9182SOmar Sandoval 562a5ed9182SOmar Sandoval if (p->slots[0] + 1 < btrfs_header_nritems(p->nodes[0])) { 563a5ed9182SOmar Sandoval p->slots[0]++; 564a5ed9182SOmar Sandoval return 0; 565a5ed9182SOmar Sandoval } 566a5ed9182SOmar Sandoval 567a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(p->nodes[0], &key, p->slots[0]); 568a5ed9182SOmar Sandoval btrfs_release_path(p); 569a5ed9182SOmar Sandoval 570a5ed9182SOmar Sandoval key.objectid += key.offset; 571a5ed9182SOmar Sandoval key.type = (u8)-1; 572a5ed9182SOmar Sandoval key.offset = (u64)-1; 573a5ed9182SOmar Sandoval 574a5ed9182SOmar Sandoval return btrfs_search_prev_slot(trans, root, &key, p, 0, 1); 575a5ed9182SOmar Sandoval } 576a5ed9182SOmar Sandoval 577a5ed9182SOmar Sandoval /* 578a5ed9182SOmar Sandoval * If remove is 1, then we are removing free space, thus clearing bits in the 579a5ed9182SOmar Sandoval * bitmap. If remove is 0, then we are adding free space, thus setting bits in 580a5ed9182SOmar Sandoval * the bitmap. 581a5ed9182SOmar Sandoval */ 582a5ed9182SOmar Sandoval static int modify_free_space_bitmap(struct btrfs_trans_handle *trans, 583a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group, 584a5ed9182SOmar Sandoval struct btrfs_path *path, 585a5ed9182SOmar Sandoval u64 start, u64 size, int remove) 586a5ed9182SOmar Sandoval { 58785a7ef13SNikolay Borisov struct btrfs_root *root = block_group->fs_info->free_space_root; 588a5ed9182SOmar Sandoval struct btrfs_key key; 589a5ed9182SOmar Sandoval u64 end = start + size; 590a5ed9182SOmar Sandoval u64 cur_start, cur_size; 591a5ed9182SOmar Sandoval int prev_bit, next_bit; 592a5ed9182SOmar Sandoval int new_extents; 593a5ed9182SOmar Sandoval int ret; 594a5ed9182SOmar Sandoval 595a5ed9182SOmar Sandoval /* 596a5ed9182SOmar Sandoval * Read the bit for the block immediately before the extent of space if 597a5ed9182SOmar Sandoval * that block is within the block group. 598a5ed9182SOmar Sandoval */ 599b3470b5dSDavid Sterba if (start > block_group->start) { 600da17066cSJeff Mahoney u64 prev_block = start - block_group->fs_info->sectorsize; 601a5ed9182SOmar Sandoval 602a5ed9182SOmar Sandoval key.objectid = prev_block; 603a5ed9182SOmar Sandoval key.type = (u8)-1; 604a5ed9182SOmar Sandoval key.offset = (u64)-1; 605a5ed9182SOmar Sandoval 606a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, 0, 1); 607a5ed9182SOmar Sandoval if (ret) 608a5ed9182SOmar Sandoval goto out; 609a5ed9182SOmar Sandoval 610a5ed9182SOmar Sandoval prev_bit = free_space_test_bit(block_group, path, prev_block); 611a5ed9182SOmar Sandoval 612a5ed9182SOmar Sandoval /* The previous block may have been in the previous bitmap. */ 613a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 614a5ed9182SOmar Sandoval if (start >= key.objectid + key.offset) { 615a5ed9182SOmar Sandoval ret = free_space_next_bitmap(trans, root, path); 616a5ed9182SOmar Sandoval if (ret) 617a5ed9182SOmar Sandoval goto out; 618a5ed9182SOmar Sandoval } 619a5ed9182SOmar Sandoval } else { 620a5ed9182SOmar Sandoval key.objectid = start; 621a5ed9182SOmar Sandoval key.type = (u8)-1; 622a5ed9182SOmar Sandoval key.offset = (u64)-1; 623a5ed9182SOmar Sandoval 624a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, 0, 1); 625a5ed9182SOmar Sandoval if (ret) 626a5ed9182SOmar Sandoval goto out; 627a5ed9182SOmar Sandoval 628a5ed9182SOmar Sandoval prev_bit = -1; 629a5ed9182SOmar Sandoval } 630a5ed9182SOmar Sandoval 631a5ed9182SOmar Sandoval /* 632a5ed9182SOmar Sandoval * Iterate over all of the bitmaps overlapped by the extent of space, 633a5ed9182SOmar Sandoval * clearing/setting bits as required. 634a5ed9182SOmar Sandoval */ 635a5ed9182SOmar Sandoval cur_start = start; 636a5ed9182SOmar Sandoval cur_size = size; 637a5ed9182SOmar Sandoval while (1) { 638a5ed9182SOmar Sandoval free_space_set_bits(block_group, path, &cur_start, &cur_size, 639a5ed9182SOmar Sandoval !remove); 640a5ed9182SOmar Sandoval if (cur_size == 0) 641a5ed9182SOmar Sandoval break; 642a5ed9182SOmar Sandoval ret = free_space_next_bitmap(trans, root, path); 643a5ed9182SOmar Sandoval if (ret) 644a5ed9182SOmar Sandoval goto out; 645a5ed9182SOmar Sandoval } 646a5ed9182SOmar Sandoval 647a5ed9182SOmar Sandoval /* 648a5ed9182SOmar Sandoval * Read the bit for the block immediately after the extent of space if 649a5ed9182SOmar Sandoval * that block is within the block group. 650a5ed9182SOmar Sandoval */ 651b3470b5dSDavid Sterba if (end < block_group->start + block_group->length) { 652a5ed9182SOmar Sandoval /* The next block may be in the next bitmap. */ 653a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 654a5ed9182SOmar Sandoval if (end >= key.objectid + key.offset) { 655a5ed9182SOmar Sandoval ret = free_space_next_bitmap(trans, root, path); 656a5ed9182SOmar Sandoval if (ret) 657a5ed9182SOmar Sandoval goto out; 658a5ed9182SOmar Sandoval } 659a5ed9182SOmar Sandoval 660a5ed9182SOmar Sandoval next_bit = free_space_test_bit(block_group, path, end); 661a5ed9182SOmar Sandoval } else { 662a5ed9182SOmar Sandoval next_bit = -1; 663a5ed9182SOmar Sandoval } 664a5ed9182SOmar Sandoval 665a5ed9182SOmar Sandoval if (remove) { 666a5ed9182SOmar Sandoval new_extents = -1; 667a5ed9182SOmar Sandoval if (prev_bit == 1) { 668a5ed9182SOmar Sandoval /* Leftover on the left. */ 669a5ed9182SOmar Sandoval new_extents++; 670a5ed9182SOmar Sandoval } 671a5ed9182SOmar Sandoval if (next_bit == 1) { 672a5ed9182SOmar Sandoval /* Leftover on the right. */ 673a5ed9182SOmar Sandoval new_extents++; 674a5ed9182SOmar Sandoval } 675a5ed9182SOmar Sandoval } else { 676a5ed9182SOmar Sandoval new_extents = 1; 677a5ed9182SOmar Sandoval if (prev_bit == 1) { 678a5ed9182SOmar Sandoval /* Merging with neighbor on the left. */ 679a5ed9182SOmar Sandoval new_extents--; 680a5ed9182SOmar Sandoval } 681a5ed9182SOmar Sandoval if (next_bit == 1) { 682a5ed9182SOmar Sandoval /* Merging with neighbor on the right. */ 683a5ed9182SOmar Sandoval new_extents--; 684a5ed9182SOmar Sandoval } 685a5ed9182SOmar Sandoval } 686a5ed9182SOmar Sandoval 687a5ed9182SOmar Sandoval btrfs_release_path(path); 688690d7682SNikolay Borisov ret = update_free_space_extent_count(trans, block_group, path, 689a5ed9182SOmar Sandoval new_extents); 690a5ed9182SOmar Sandoval 691a5ed9182SOmar Sandoval out: 692a5ed9182SOmar Sandoval return ret; 693a5ed9182SOmar Sandoval } 694a5ed9182SOmar Sandoval 695a5ed9182SOmar Sandoval static int remove_free_space_extent(struct btrfs_trans_handle *trans, 696a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group, 697a5ed9182SOmar Sandoval struct btrfs_path *path, 698a5ed9182SOmar Sandoval u64 start, u64 size) 699a5ed9182SOmar Sandoval { 700e581168dSNikolay Borisov struct btrfs_root *root = trans->fs_info->free_space_root; 701a5ed9182SOmar Sandoval struct btrfs_key key; 702a5ed9182SOmar Sandoval u64 found_start, found_end; 703a5ed9182SOmar Sandoval u64 end = start + size; 704a5ed9182SOmar Sandoval int new_extents = -1; 705a5ed9182SOmar Sandoval int ret; 706a5ed9182SOmar Sandoval 707a5ed9182SOmar Sandoval key.objectid = start; 708a5ed9182SOmar Sandoval key.type = (u8)-1; 709a5ed9182SOmar Sandoval key.offset = (u64)-1; 710a5ed9182SOmar Sandoval 711a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 712a5ed9182SOmar Sandoval if (ret) 713a5ed9182SOmar Sandoval goto out; 714a5ed9182SOmar Sandoval 715a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 716a5ed9182SOmar Sandoval 717a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_EXTENT_KEY); 718a5ed9182SOmar Sandoval 719a5ed9182SOmar Sandoval found_start = key.objectid; 720a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 721a5ed9182SOmar Sandoval ASSERT(start >= found_start && end <= found_end); 722a5ed9182SOmar Sandoval 723a5ed9182SOmar Sandoval /* 724a5ed9182SOmar Sandoval * Okay, now that we've found the free space extent which contains the 725a5ed9182SOmar Sandoval * free space that we are removing, there are four cases: 726a5ed9182SOmar Sandoval * 727a5ed9182SOmar Sandoval * 1. We're using the whole extent: delete the key we found and 728a5ed9182SOmar Sandoval * decrement the free space extent count. 729a5ed9182SOmar Sandoval * 2. We are using part of the extent starting at the beginning: delete 730a5ed9182SOmar Sandoval * the key we found and insert a new key representing the leftover at 731a5ed9182SOmar Sandoval * the end. There is no net change in the number of extents. 732a5ed9182SOmar Sandoval * 3. We are using part of the extent ending at the end: delete the key 733a5ed9182SOmar Sandoval * we found and insert a new key representing the leftover at the 734a5ed9182SOmar Sandoval * beginning. There is no net change in the number of extents. 735a5ed9182SOmar Sandoval * 4. We are using part of the extent in the middle: delete the key we 736a5ed9182SOmar Sandoval * found and insert two new keys representing the leftovers on each 737a5ed9182SOmar Sandoval * side. Where we used to have one extent, we now have two, so increment 738a5ed9182SOmar Sandoval * the extent count. We may need to convert the block group to bitmaps 739a5ed9182SOmar Sandoval * as a result. 740a5ed9182SOmar Sandoval */ 741a5ed9182SOmar Sandoval 742a5ed9182SOmar Sandoval /* Delete the existing key (cases 1-4). */ 743a5ed9182SOmar Sandoval ret = btrfs_del_item(trans, root, path); 744a5ed9182SOmar Sandoval if (ret) 745a5ed9182SOmar Sandoval goto out; 746a5ed9182SOmar Sandoval 747a5ed9182SOmar Sandoval /* Add a key for leftovers at the beginning (cases 3 and 4). */ 748a5ed9182SOmar Sandoval if (start > found_start) { 749a5ed9182SOmar Sandoval key.objectid = found_start; 750a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_EXTENT_KEY; 751a5ed9182SOmar Sandoval key.offset = start - found_start; 752a5ed9182SOmar Sandoval 753a5ed9182SOmar Sandoval btrfs_release_path(path); 754a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, 0); 755a5ed9182SOmar Sandoval if (ret) 756a5ed9182SOmar Sandoval goto out; 757a5ed9182SOmar Sandoval new_extents++; 758a5ed9182SOmar Sandoval } 759a5ed9182SOmar Sandoval 760a5ed9182SOmar Sandoval /* Add a key for leftovers at the end (cases 2 and 4). */ 761a5ed9182SOmar Sandoval if (end < found_end) { 762a5ed9182SOmar Sandoval key.objectid = end; 763a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_EXTENT_KEY; 764a5ed9182SOmar Sandoval key.offset = found_end - end; 765a5ed9182SOmar Sandoval 766a5ed9182SOmar Sandoval btrfs_release_path(path); 767a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, 0); 768a5ed9182SOmar Sandoval if (ret) 769a5ed9182SOmar Sandoval goto out; 770a5ed9182SOmar Sandoval new_extents++; 771a5ed9182SOmar Sandoval } 772a5ed9182SOmar Sandoval 773a5ed9182SOmar Sandoval btrfs_release_path(path); 774690d7682SNikolay Borisov ret = update_free_space_extent_count(trans, block_group, path, 775a5ed9182SOmar Sandoval new_extents); 776a5ed9182SOmar Sandoval 777a5ed9182SOmar Sandoval out: 778a5ed9182SOmar Sandoval return ret; 779a5ed9182SOmar Sandoval } 780a5ed9182SOmar Sandoval 781ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 782a5ed9182SOmar Sandoval int __remove_from_free_space_tree(struct btrfs_trans_handle *trans, 783a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group, 784a5ed9182SOmar Sandoval struct btrfs_path *path, u64 start, u64 size) 785a5ed9182SOmar Sandoval { 786a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 787a5ed9182SOmar Sandoval u32 flags; 788a5ed9182SOmar Sandoval int ret; 789a5ed9182SOmar Sandoval 790a5ed9182SOmar Sandoval if (block_group->needs_free_space) { 7919a7e0f92SNikolay Borisov ret = __add_block_group_free_space(trans, block_group, path); 792a5ed9182SOmar Sandoval if (ret) 793a5ed9182SOmar Sandoval return ret; 794a5ed9182SOmar Sandoval } 795a5ed9182SOmar Sandoval 7962ccf545eSDavid Sterba info = search_free_space_info(NULL, block_group, path, 0); 797a5ed9182SOmar Sandoval if (IS_ERR(info)) 798a5ed9182SOmar Sandoval return PTR_ERR(info); 799a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(path->nodes[0], info); 800a5ed9182SOmar Sandoval btrfs_release_path(path); 801a5ed9182SOmar Sandoval 802a5ed9182SOmar Sandoval if (flags & BTRFS_FREE_SPACE_USING_BITMAPS) { 80385a7ef13SNikolay Borisov return modify_free_space_bitmap(trans, block_group, path, 80485a7ef13SNikolay Borisov start, size, 1); 805a5ed9182SOmar Sandoval } else { 806e581168dSNikolay Borisov return remove_free_space_extent(trans, block_group, path, 807e581168dSNikolay Borisov start, size); 808a5ed9182SOmar Sandoval } 809a5ed9182SOmar Sandoval } 810a5ed9182SOmar Sandoval 811a5ed9182SOmar Sandoval int remove_from_free_space_tree(struct btrfs_trans_handle *trans, 812a5ed9182SOmar Sandoval u64 start, u64 size) 813a5ed9182SOmar Sandoval { 814a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group; 815a5ed9182SOmar Sandoval struct btrfs_path *path; 816a5ed9182SOmar Sandoval int ret; 817a5ed9182SOmar Sandoval 81825a356d3SNikolay Borisov if (!btrfs_fs_compat_ro(trans->fs_info, FREE_SPACE_TREE)) 819a5ed9182SOmar Sandoval return 0; 820a5ed9182SOmar Sandoval 821a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 822a5ed9182SOmar Sandoval if (!path) { 823a5ed9182SOmar Sandoval ret = -ENOMEM; 824a5ed9182SOmar Sandoval goto out; 825a5ed9182SOmar Sandoval } 826a5ed9182SOmar Sandoval 82725a356d3SNikolay Borisov block_group = btrfs_lookup_block_group(trans->fs_info, start); 828a5ed9182SOmar Sandoval if (!block_group) { 829a5ed9182SOmar Sandoval ASSERT(0); 830a5ed9182SOmar Sandoval ret = -ENOENT; 831a5ed9182SOmar Sandoval goto out; 832a5ed9182SOmar Sandoval } 833a5ed9182SOmar Sandoval 834a5ed9182SOmar Sandoval mutex_lock(&block_group->free_space_lock); 835c31683a6SNikolay Borisov ret = __remove_from_free_space_tree(trans, block_group, path, start, 836c31683a6SNikolay Borisov size); 837a5ed9182SOmar Sandoval mutex_unlock(&block_group->free_space_lock); 838a5ed9182SOmar Sandoval 839a5ed9182SOmar Sandoval btrfs_put_block_group(block_group); 840a5ed9182SOmar Sandoval out: 841a5ed9182SOmar Sandoval btrfs_free_path(path); 842a5ed9182SOmar Sandoval if (ret) 84366642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 844a5ed9182SOmar Sandoval return ret; 845a5ed9182SOmar Sandoval } 846a5ed9182SOmar Sandoval 847a5ed9182SOmar Sandoval static int add_free_space_extent(struct btrfs_trans_handle *trans, 848a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group, 849a5ed9182SOmar Sandoval struct btrfs_path *path, 850a5ed9182SOmar Sandoval u64 start, u64 size) 851a5ed9182SOmar Sandoval { 8525cb17822SNikolay Borisov struct btrfs_root *root = trans->fs_info->free_space_root; 853a5ed9182SOmar Sandoval struct btrfs_key key, new_key; 854a5ed9182SOmar Sandoval u64 found_start, found_end; 855a5ed9182SOmar Sandoval u64 end = start + size; 856a5ed9182SOmar Sandoval int new_extents = 1; 857a5ed9182SOmar Sandoval int ret; 858a5ed9182SOmar Sandoval 859a5ed9182SOmar Sandoval /* 860a5ed9182SOmar Sandoval * We are adding a new extent of free space, but we need to merge 861a5ed9182SOmar Sandoval * extents. There are four cases here: 862a5ed9182SOmar Sandoval * 863a5ed9182SOmar Sandoval * 1. The new extent does not have any immediate neighbors to merge 864a5ed9182SOmar Sandoval * with: add the new key and increment the free space extent count. We 865a5ed9182SOmar Sandoval * may need to convert the block group to bitmaps as a result. 866a5ed9182SOmar Sandoval * 2. The new extent has an immediate neighbor before it: remove the 867a5ed9182SOmar Sandoval * previous key and insert a new key combining both of them. There is no 868a5ed9182SOmar Sandoval * net change in the number of extents. 869a5ed9182SOmar Sandoval * 3. The new extent has an immediate neighbor after it: remove the next 870a5ed9182SOmar Sandoval * key and insert a new key combining both of them. There is no net 871a5ed9182SOmar Sandoval * change in the number of extents. 872a5ed9182SOmar Sandoval * 4. The new extent has immediate neighbors on both sides: remove both 873a5ed9182SOmar Sandoval * of the keys and insert a new key combining all of them. Where we used 874a5ed9182SOmar Sandoval * to have two extents, we now have one, so decrement the extent count. 875a5ed9182SOmar Sandoval */ 876a5ed9182SOmar Sandoval 877a5ed9182SOmar Sandoval new_key.objectid = start; 878a5ed9182SOmar Sandoval new_key.type = BTRFS_FREE_SPACE_EXTENT_KEY; 879a5ed9182SOmar Sandoval new_key.offset = size; 880a5ed9182SOmar Sandoval 881a5ed9182SOmar Sandoval /* Search for a neighbor on the left. */ 882b3470b5dSDavid Sterba if (start == block_group->start) 883a5ed9182SOmar Sandoval goto right; 884a5ed9182SOmar Sandoval key.objectid = start - 1; 885a5ed9182SOmar Sandoval key.type = (u8)-1; 886a5ed9182SOmar Sandoval key.offset = (u64)-1; 887a5ed9182SOmar Sandoval 888a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 889a5ed9182SOmar Sandoval if (ret) 890a5ed9182SOmar Sandoval goto out; 891a5ed9182SOmar Sandoval 892a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 893a5ed9182SOmar Sandoval 894a5ed9182SOmar Sandoval if (key.type != BTRFS_FREE_SPACE_EXTENT_KEY) { 895a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_INFO_KEY); 896a5ed9182SOmar Sandoval btrfs_release_path(path); 897a5ed9182SOmar Sandoval goto right; 898a5ed9182SOmar Sandoval } 899a5ed9182SOmar Sandoval 900a5ed9182SOmar Sandoval found_start = key.objectid; 901a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 902b3470b5dSDavid Sterba ASSERT(found_start >= block_group->start && 903b3470b5dSDavid Sterba found_end > block_group->start); 904a5ed9182SOmar Sandoval ASSERT(found_start < start && found_end <= start); 905a5ed9182SOmar Sandoval 906a5ed9182SOmar Sandoval /* 907a5ed9182SOmar Sandoval * Delete the neighbor on the left and absorb it into the new key (cases 908a5ed9182SOmar Sandoval * 2 and 4). 909a5ed9182SOmar Sandoval */ 910a5ed9182SOmar Sandoval if (found_end == start) { 911a5ed9182SOmar Sandoval ret = btrfs_del_item(trans, root, path); 912a5ed9182SOmar Sandoval if (ret) 913a5ed9182SOmar Sandoval goto out; 914a5ed9182SOmar Sandoval new_key.objectid = found_start; 915a5ed9182SOmar Sandoval new_key.offset += key.offset; 916a5ed9182SOmar Sandoval new_extents--; 917a5ed9182SOmar Sandoval } 918a5ed9182SOmar Sandoval btrfs_release_path(path); 919a5ed9182SOmar Sandoval 920a5ed9182SOmar Sandoval right: 921a5ed9182SOmar Sandoval /* Search for a neighbor on the right. */ 922b3470b5dSDavid Sterba if (end == block_group->start + block_group->length) 923a5ed9182SOmar Sandoval goto insert; 924a5ed9182SOmar Sandoval key.objectid = end; 925a5ed9182SOmar Sandoval key.type = (u8)-1; 926a5ed9182SOmar Sandoval key.offset = (u64)-1; 927a5ed9182SOmar Sandoval 928a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 929a5ed9182SOmar Sandoval if (ret) 930a5ed9182SOmar Sandoval goto out; 931a5ed9182SOmar Sandoval 932a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 933a5ed9182SOmar Sandoval 934a5ed9182SOmar Sandoval if (key.type != BTRFS_FREE_SPACE_EXTENT_KEY) { 935a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_INFO_KEY); 936a5ed9182SOmar Sandoval btrfs_release_path(path); 937a5ed9182SOmar Sandoval goto insert; 938a5ed9182SOmar Sandoval } 939a5ed9182SOmar Sandoval 940a5ed9182SOmar Sandoval found_start = key.objectid; 941a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 942b3470b5dSDavid Sterba ASSERT(found_start >= block_group->start && 943b3470b5dSDavid Sterba found_end > block_group->start); 944a5ed9182SOmar Sandoval ASSERT((found_start < start && found_end <= start) || 945a5ed9182SOmar Sandoval (found_start >= end && found_end > end)); 946a5ed9182SOmar Sandoval 947a5ed9182SOmar Sandoval /* 948a5ed9182SOmar Sandoval * Delete the neighbor on the right and absorb it into the new key 949a5ed9182SOmar Sandoval * (cases 3 and 4). 950a5ed9182SOmar Sandoval */ 951a5ed9182SOmar Sandoval if (found_start == end) { 952a5ed9182SOmar Sandoval ret = btrfs_del_item(trans, root, path); 953a5ed9182SOmar Sandoval if (ret) 954a5ed9182SOmar Sandoval goto out; 955a5ed9182SOmar Sandoval new_key.offset += key.offset; 956a5ed9182SOmar Sandoval new_extents--; 957a5ed9182SOmar Sandoval } 958a5ed9182SOmar Sandoval btrfs_release_path(path); 959a5ed9182SOmar Sandoval 960a5ed9182SOmar Sandoval insert: 961a5ed9182SOmar Sandoval /* Insert the new key (cases 1-4). */ 962a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &new_key, 0); 963a5ed9182SOmar Sandoval if (ret) 964a5ed9182SOmar Sandoval goto out; 965a5ed9182SOmar Sandoval 966a5ed9182SOmar Sandoval btrfs_release_path(path); 967690d7682SNikolay Borisov ret = update_free_space_extent_count(trans, block_group, path, 968a5ed9182SOmar Sandoval new_extents); 969a5ed9182SOmar Sandoval 970a5ed9182SOmar Sandoval out: 971a5ed9182SOmar Sandoval return ret; 972a5ed9182SOmar Sandoval } 973a5ed9182SOmar Sandoval 974ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 975a5ed9182SOmar Sandoval int __add_to_free_space_tree(struct btrfs_trans_handle *trans, 976a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group, 977a5ed9182SOmar Sandoval struct btrfs_path *path, u64 start, u64 size) 978a5ed9182SOmar Sandoval { 979a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 980a5ed9182SOmar Sandoval u32 flags; 981a5ed9182SOmar Sandoval int ret; 982a5ed9182SOmar Sandoval 983a5ed9182SOmar Sandoval if (block_group->needs_free_space) { 9849a7e0f92SNikolay Borisov ret = __add_block_group_free_space(trans, block_group, path); 985a5ed9182SOmar Sandoval if (ret) 986a5ed9182SOmar Sandoval return ret; 987a5ed9182SOmar Sandoval } 988a5ed9182SOmar Sandoval 9892ccf545eSDavid Sterba info = search_free_space_info(NULL, block_group, path, 0); 990a5ed9182SOmar Sandoval if (IS_ERR(info)) 991a5ed9182SOmar Sandoval return PTR_ERR(info); 992a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(path->nodes[0], info); 993a5ed9182SOmar Sandoval btrfs_release_path(path); 994a5ed9182SOmar Sandoval 995a5ed9182SOmar Sandoval if (flags & BTRFS_FREE_SPACE_USING_BITMAPS) { 99685a7ef13SNikolay Borisov return modify_free_space_bitmap(trans, block_group, path, 99785a7ef13SNikolay Borisov start, size, 0); 998a5ed9182SOmar Sandoval } else { 9995cb17822SNikolay Borisov return add_free_space_extent(trans, block_group, path, start, 10005cb17822SNikolay Borisov size); 1001a5ed9182SOmar Sandoval } 1002a5ed9182SOmar Sandoval } 1003a5ed9182SOmar Sandoval 1004a5ed9182SOmar Sandoval int add_to_free_space_tree(struct btrfs_trans_handle *trans, 1005a5ed9182SOmar Sandoval u64 start, u64 size) 1006a5ed9182SOmar Sandoval { 1007a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group; 1008a5ed9182SOmar Sandoval struct btrfs_path *path; 1009a5ed9182SOmar Sandoval int ret; 1010a5ed9182SOmar Sandoval 1011e7355e50SNikolay Borisov if (!btrfs_fs_compat_ro(trans->fs_info, FREE_SPACE_TREE)) 1012a5ed9182SOmar Sandoval return 0; 1013a5ed9182SOmar Sandoval 1014a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1015a5ed9182SOmar Sandoval if (!path) { 1016a5ed9182SOmar Sandoval ret = -ENOMEM; 1017a5ed9182SOmar Sandoval goto out; 1018a5ed9182SOmar Sandoval } 1019a5ed9182SOmar Sandoval 1020e7355e50SNikolay Borisov block_group = btrfs_lookup_block_group(trans->fs_info, start); 1021a5ed9182SOmar Sandoval if (!block_group) { 1022a5ed9182SOmar Sandoval ASSERT(0); 1023a5ed9182SOmar Sandoval ret = -ENOENT; 1024a5ed9182SOmar Sandoval goto out; 1025a5ed9182SOmar Sandoval } 1026a5ed9182SOmar Sandoval 1027a5ed9182SOmar Sandoval mutex_lock(&block_group->free_space_lock); 10282d5cffa1SNikolay Borisov ret = __add_to_free_space_tree(trans, block_group, path, start, size); 1029a5ed9182SOmar Sandoval mutex_unlock(&block_group->free_space_lock); 1030a5ed9182SOmar Sandoval 1031a5ed9182SOmar Sandoval btrfs_put_block_group(block_group); 1032a5ed9182SOmar Sandoval out: 1033a5ed9182SOmar Sandoval btrfs_free_path(path); 1034a5ed9182SOmar Sandoval if (ret) 103566642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 1036a5ed9182SOmar Sandoval return ret; 1037a5ed9182SOmar Sandoval } 1038a5ed9182SOmar Sandoval 1039a5ed9182SOmar Sandoval /* 1040a5ed9182SOmar Sandoval * Populate the free space tree by walking the extent tree. Operations on the 1041a5ed9182SOmar Sandoval * extent tree that happen as a result of writes to the free space tree will go 1042a5ed9182SOmar Sandoval * through the normal add/remove hooks. 1043a5ed9182SOmar Sandoval */ 1044a5ed9182SOmar Sandoval static int populate_free_space_tree(struct btrfs_trans_handle *trans, 1045a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group) 1046a5ed9182SOmar Sandoval { 1047ffa9a9efSNikolay Borisov struct btrfs_root *extent_root = trans->fs_info->extent_root; 1048a5ed9182SOmar Sandoval struct btrfs_path *path, *path2; 1049a5ed9182SOmar Sandoval struct btrfs_key key; 1050a5ed9182SOmar Sandoval u64 start, end; 1051a5ed9182SOmar Sandoval int ret; 1052a5ed9182SOmar Sandoval 1053a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1054a5ed9182SOmar Sandoval if (!path) 1055a5ed9182SOmar Sandoval return -ENOMEM; 1056019599adSGu Jinxiang path->reada = READA_FORWARD; 1057a5ed9182SOmar Sandoval 1058a5ed9182SOmar Sandoval path2 = btrfs_alloc_path(); 1059a5ed9182SOmar Sandoval if (!path2) { 1060a5ed9182SOmar Sandoval btrfs_free_path(path); 1061a5ed9182SOmar Sandoval return -ENOMEM; 1062a5ed9182SOmar Sandoval } 1063a5ed9182SOmar Sandoval 106466afee18SNikolay Borisov ret = add_new_free_space_info(trans, block_group, path2); 1065a5ed9182SOmar Sandoval if (ret) 1066a5ed9182SOmar Sandoval goto out; 1067a5ed9182SOmar Sandoval 1068511711afSChris Mason mutex_lock(&block_group->free_space_lock); 1069511711afSChris Mason 1070a5ed9182SOmar Sandoval /* 1071a5ed9182SOmar Sandoval * Iterate through all of the extent and metadata items in this block 1072a5ed9182SOmar Sandoval * group, adding the free space between them and the free space at the 1073a5ed9182SOmar Sandoval * end. Note that EXTENT_ITEM and METADATA_ITEM are less than 1074a5ed9182SOmar Sandoval * BLOCK_GROUP_ITEM, so an extent may precede the block group that it's 1075a5ed9182SOmar Sandoval * contained in. 1076a5ed9182SOmar Sandoval */ 1077b3470b5dSDavid Sterba key.objectid = block_group->start; 1078a5ed9182SOmar Sandoval key.type = BTRFS_EXTENT_ITEM_KEY; 1079a5ed9182SOmar Sandoval key.offset = 0; 1080a5ed9182SOmar Sandoval 1081a5ed9182SOmar Sandoval ret = btrfs_search_slot_for_read(extent_root, &key, path, 1, 0); 1082a5ed9182SOmar Sandoval if (ret < 0) 1083511711afSChris Mason goto out_locked; 1084a5ed9182SOmar Sandoval ASSERT(ret == 0); 1085a5ed9182SOmar Sandoval 1086b3470b5dSDavid Sterba start = block_group->start; 1087b3470b5dSDavid Sterba end = block_group->start + block_group->length; 1088a5ed9182SOmar Sandoval while (1) { 1089a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 1090a5ed9182SOmar Sandoval 1091a5ed9182SOmar Sandoval if (key.type == BTRFS_EXTENT_ITEM_KEY || 1092a5ed9182SOmar Sandoval key.type == BTRFS_METADATA_ITEM_KEY) { 1093a5ed9182SOmar Sandoval if (key.objectid >= end) 1094a5ed9182SOmar Sandoval break; 1095a5ed9182SOmar Sandoval 1096a5ed9182SOmar Sandoval if (start < key.objectid) { 10972d5cffa1SNikolay Borisov ret = __add_to_free_space_tree(trans, 1098a5ed9182SOmar Sandoval block_group, 1099a5ed9182SOmar Sandoval path2, start, 1100a5ed9182SOmar Sandoval key.objectid - 1101a5ed9182SOmar Sandoval start); 1102a5ed9182SOmar Sandoval if (ret) 1103511711afSChris Mason goto out_locked; 1104a5ed9182SOmar Sandoval } 1105a5ed9182SOmar Sandoval start = key.objectid; 1106a5ed9182SOmar Sandoval if (key.type == BTRFS_METADATA_ITEM_KEY) 1107ffa9a9efSNikolay Borisov start += trans->fs_info->nodesize; 1108a5ed9182SOmar Sandoval else 1109a5ed9182SOmar Sandoval start += key.offset; 1110a5ed9182SOmar Sandoval } else if (key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { 1111b3470b5dSDavid Sterba if (key.objectid != block_group->start) 1112a5ed9182SOmar Sandoval break; 1113a5ed9182SOmar Sandoval } 1114a5ed9182SOmar Sandoval 1115a5ed9182SOmar Sandoval ret = btrfs_next_item(extent_root, path); 1116a5ed9182SOmar Sandoval if (ret < 0) 1117511711afSChris Mason goto out_locked; 1118a5ed9182SOmar Sandoval if (ret) 1119a5ed9182SOmar Sandoval break; 1120a5ed9182SOmar Sandoval } 1121a5ed9182SOmar Sandoval if (start < end) { 11222d5cffa1SNikolay Borisov ret = __add_to_free_space_tree(trans, block_group, path2, 11232d5cffa1SNikolay Borisov start, end - start); 1124a5ed9182SOmar Sandoval if (ret) 1125511711afSChris Mason goto out_locked; 1126a5ed9182SOmar Sandoval } 1127a5ed9182SOmar Sandoval 1128a5ed9182SOmar Sandoval ret = 0; 1129511711afSChris Mason out_locked: 1130511711afSChris Mason mutex_unlock(&block_group->free_space_lock); 1131a5ed9182SOmar Sandoval out: 1132a5ed9182SOmar Sandoval btrfs_free_path(path2); 1133a5ed9182SOmar Sandoval btrfs_free_path(path); 1134a5ed9182SOmar Sandoval return ret; 1135a5ed9182SOmar Sandoval } 1136a5ed9182SOmar Sandoval 1137a5ed9182SOmar Sandoval int btrfs_create_free_space_tree(struct btrfs_fs_info *fs_info) 1138a5ed9182SOmar Sandoval { 1139a5ed9182SOmar Sandoval struct btrfs_trans_handle *trans; 1140a5ed9182SOmar Sandoval struct btrfs_root *tree_root = fs_info->tree_root; 1141a5ed9182SOmar Sandoval struct btrfs_root *free_space_root; 1142a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group; 1143a5ed9182SOmar Sandoval struct rb_node *node; 1144a5ed9182SOmar Sandoval int ret; 1145a5ed9182SOmar Sandoval 1146a5ed9182SOmar Sandoval trans = btrfs_start_transaction(tree_root, 0); 1147a5ed9182SOmar Sandoval if (IS_ERR(trans)) 1148a5ed9182SOmar Sandoval return PTR_ERR(trans); 1149a5ed9182SOmar Sandoval 1150afcdd129SJosef Bacik set_bit(BTRFS_FS_CREATING_FREE_SPACE_TREE, &fs_info->flags); 11519b7a2440SDavid Sterba free_space_root = btrfs_create_tree(trans, 1152a5ed9182SOmar Sandoval BTRFS_FREE_SPACE_TREE_OBJECTID); 1153a5ed9182SOmar Sandoval if (IS_ERR(free_space_root)) { 1154a5ed9182SOmar Sandoval ret = PTR_ERR(free_space_root); 1155a5ed9182SOmar Sandoval goto abort; 1156a5ed9182SOmar Sandoval } 1157a5ed9182SOmar Sandoval fs_info->free_space_root = free_space_root; 1158a5ed9182SOmar Sandoval 1159a5ed9182SOmar Sandoval node = rb_first(&fs_info->block_group_cache_tree); 1160a5ed9182SOmar Sandoval while (node) { 1161a5ed9182SOmar Sandoval block_group = rb_entry(node, struct btrfs_block_group_cache, 1162a5ed9182SOmar Sandoval cache_node); 1163ffa9a9efSNikolay Borisov ret = populate_free_space_tree(trans, block_group); 1164a5ed9182SOmar Sandoval if (ret) 1165a5ed9182SOmar Sandoval goto abort; 1166a5ed9182SOmar Sandoval node = rb_next(node); 1167a5ed9182SOmar Sandoval } 1168a5ed9182SOmar Sandoval 1169a5ed9182SOmar Sandoval btrfs_set_fs_compat_ro(fs_info, FREE_SPACE_TREE); 11706675df31SOmar Sandoval btrfs_set_fs_compat_ro(fs_info, FREE_SPACE_TREE_VALID); 1171afcdd129SJosef Bacik clear_bit(BTRFS_FS_CREATING_FREE_SPACE_TREE, &fs_info->flags); 1172a5ed9182SOmar Sandoval 11730bef7109SSahil Kang return btrfs_commit_transaction(trans); 1174a5ed9182SOmar Sandoval 1175a5ed9182SOmar Sandoval abort: 1176afcdd129SJosef Bacik clear_bit(BTRFS_FS_CREATING_FREE_SPACE_TREE, &fs_info->flags); 117766642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 11783a45bb20SJeff Mahoney btrfs_end_transaction(trans); 1179a5ed9182SOmar Sandoval return ret; 1180a5ed9182SOmar Sandoval } 1181a5ed9182SOmar Sandoval 1182a5ed9182SOmar Sandoval static int clear_free_space_tree(struct btrfs_trans_handle *trans, 1183a5ed9182SOmar Sandoval struct btrfs_root *root) 1184a5ed9182SOmar Sandoval { 1185a5ed9182SOmar Sandoval struct btrfs_path *path; 1186a5ed9182SOmar Sandoval struct btrfs_key key; 1187a5ed9182SOmar Sandoval int nr; 1188a5ed9182SOmar Sandoval int ret; 1189a5ed9182SOmar Sandoval 1190a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1191a5ed9182SOmar Sandoval if (!path) 1192a5ed9182SOmar Sandoval return -ENOMEM; 1193a5ed9182SOmar Sandoval 1194a5ed9182SOmar Sandoval path->leave_spinning = 1; 1195a5ed9182SOmar Sandoval 1196a5ed9182SOmar Sandoval key.objectid = 0; 1197a5ed9182SOmar Sandoval key.type = 0; 1198a5ed9182SOmar Sandoval key.offset = 0; 1199a5ed9182SOmar Sandoval 1200a5ed9182SOmar Sandoval while (1) { 1201a5ed9182SOmar Sandoval ret = btrfs_search_slot(trans, root, &key, path, -1, 1); 1202a5ed9182SOmar Sandoval if (ret < 0) 1203a5ed9182SOmar Sandoval goto out; 1204a5ed9182SOmar Sandoval 1205a5ed9182SOmar Sandoval nr = btrfs_header_nritems(path->nodes[0]); 1206a5ed9182SOmar Sandoval if (!nr) 1207a5ed9182SOmar Sandoval break; 1208a5ed9182SOmar Sandoval 1209a5ed9182SOmar Sandoval path->slots[0] = 0; 1210a5ed9182SOmar Sandoval ret = btrfs_del_items(trans, root, path, 0, nr); 1211a5ed9182SOmar Sandoval if (ret) 1212a5ed9182SOmar Sandoval goto out; 1213a5ed9182SOmar Sandoval 1214a5ed9182SOmar Sandoval btrfs_release_path(path); 1215a5ed9182SOmar Sandoval } 1216a5ed9182SOmar Sandoval 1217a5ed9182SOmar Sandoval ret = 0; 1218a5ed9182SOmar Sandoval out: 1219a5ed9182SOmar Sandoval btrfs_free_path(path); 1220a5ed9182SOmar Sandoval return ret; 1221a5ed9182SOmar Sandoval } 1222a5ed9182SOmar Sandoval 1223a5ed9182SOmar Sandoval int btrfs_clear_free_space_tree(struct btrfs_fs_info *fs_info) 1224a5ed9182SOmar Sandoval { 1225a5ed9182SOmar Sandoval struct btrfs_trans_handle *trans; 1226a5ed9182SOmar Sandoval struct btrfs_root *tree_root = fs_info->tree_root; 1227a5ed9182SOmar Sandoval struct btrfs_root *free_space_root = fs_info->free_space_root; 1228a5ed9182SOmar Sandoval int ret; 1229a5ed9182SOmar Sandoval 1230a5ed9182SOmar Sandoval trans = btrfs_start_transaction(tree_root, 0); 1231a5ed9182SOmar Sandoval if (IS_ERR(trans)) 1232a5ed9182SOmar Sandoval return PTR_ERR(trans); 1233a5ed9182SOmar Sandoval 1234a5ed9182SOmar Sandoval btrfs_clear_fs_compat_ro(fs_info, FREE_SPACE_TREE); 12356675df31SOmar Sandoval btrfs_clear_fs_compat_ro(fs_info, FREE_SPACE_TREE_VALID); 1236a5ed9182SOmar Sandoval fs_info->free_space_root = NULL; 1237a5ed9182SOmar Sandoval 1238a5ed9182SOmar Sandoval ret = clear_free_space_tree(trans, free_space_root); 1239a5ed9182SOmar Sandoval if (ret) 1240a5ed9182SOmar Sandoval goto abort; 1241a5ed9182SOmar Sandoval 1242ab9ce7d4SLu Fengqi ret = btrfs_del_root(trans, &free_space_root->root_key); 1243a5ed9182SOmar Sandoval if (ret) 1244a5ed9182SOmar Sandoval goto abort; 1245a5ed9182SOmar Sandoval 1246a5ed9182SOmar Sandoval list_del(&free_space_root->dirty_list); 1247a5ed9182SOmar Sandoval 1248a5ed9182SOmar Sandoval btrfs_tree_lock(free_space_root->node); 12496a884d7dSDavid Sterba btrfs_clean_tree_block(free_space_root->node); 1250a5ed9182SOmar Sandoval btrfs_tree_unlock(free_space_root->node); 1251a5ed9182SOmar Sandoval btrfs_free_tree_block(trans, free_space_root, free_space_root->node, 1252a5ed9182SOmar Sandoval 0, 1); 1253a5ed9182SOmar Sandoval 1254a5ed9182SOmar Sandoval free_extent_buffer(free_space_root->node); 1255a5ed9182SOmar Sandoval free_extent_buffer(free_space_root->commit_root); 1256a5ed9182SOmar Sandoval kfree(free_space_root); 1257a5ed9182SOmar Sandoval 12580bef7109SSahil Kang return btrfs_commit_transaction(trans); 1259a5ed9182SOmar Sandoval 1260a5ed9182SOmar Sandoval abort: 126166642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 12623a45bb20SJeff Mahoney btrfs_end_transaction(trans); 1263a5ed9182SOmar Sandoval return ret; 1264a5ed9182SOmar Sandoval } 1265a5ed9182SOmar Sandoval 1266a5ed9182SOmar Sandoval static int __add_block_group_free_space(struct btrfs_trans_handle *trans, 1267a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group, 1268a5ed9182SOmar Sandoval struct btrfs_path *path) 1269a5ed9182SOmar Sandoval { 1270a5ed9182SOmar Sandoval int ret; 1271a5ed9182SOmar Sandoval 1272a5ed9182SOmar Sandoval block_group->needs_free_space = 0; 1273a5ed9182SOmar Sandoval 127466afee18SNikolay Borisov ret = add_new_free_space_info(trans, block_group, path); 1275a5ed9182SOmar Sandoval if (ret) 1276a5ed9182SOmar Sandoval return ret; 1277a5ed9182SOmar Sandoval 12782d5cffa1SNikolay Borisov return __add_to_free_space_tree(trans, block_group, path, 1279b3470b5dSDavid Sterba block_group->start, 1280b3470b5dSDavid Sterba block_group->length); 1281a5ed9182SOmar Sandoval } 1282a5ed9182SOmar Sandoval 1283a5ed9182SOmar Sandoval int add_block_group_free_space(struct btrfs_trans_handle *trans, 1284a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group) 1285a5ed9182SOmar Sandoval { 1286e4e0711cSNikolay Borisov struct btrfs_fs_info *fs_info = trans->fs_info; 1287a5ed9182SOmar Sandoval struct btrfs_path *path = NULL; 1288a5ed9182SOmar Sandoval int ret = 0; 1289a5ed9182SOmar Sandoval 1290a5ed9182SOmar Sandoval if (!btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) 1291a5ed9182SOmar Sandoval return 0; 1292a5ed9182SOmar Sandoval 1293a5ed9182SOmar Sandoval mutex_lock(&block_group->free_space_lock); 1294a5ed9182SOmar Sandoval if (!block_group->needs_free_space) 1295a5ed9182SOmar Sandoval goto out; 1296a5ed9182SOmar Sandoval 1297a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1298a5ed9182SOmar Sandoval if (!path) { 1299a5ed9182SOmar Sandoval ret = -ENOMEM; 1300a5ed9182SOmar Sandoval goto out; 1301a5ed9182SOmar Sandoval } 1302a5ed9182SOmar Sandoval 13039a7e0f92SNikolay Borisov ret = __add_block_group_free_space(trans, block_group, path); 1304a5ed9182SOmar Sandoval 1305a5ed9182SOmar Sandoval out: 1306a5ed9182SOmar Sandoval btrfs_free_path(path); 1307a5ed9182SOmar Sandoval mutex_unlock(&block_group->free_space_lock); 1308a5ed9182SOmar Sandoval if (ret) 130966642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 1310a5ed9182SOmar Sandoval return ret; 1311a5ed9182SOmar Sandoval } 1312a5ed9182SOmar Sandoval 1313a5ed9182SOmar Sandoval int remove_block_group_free_space(struct btrfs_trans_handle *trans, 1314a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group) 1315a5ed9182SOmar Sandoval { 1316f3f72779SNikolay Borisov struct btrfs_root *root = trans->fs_info->free_space_root; 1317a5ed9182SOmar Sandoval struct btrfs_path *path; 1318a5ed9182SOmar Sandoval struct btrfs_key key, found_key; 1319a5ed9182SOmar Sandoval struct extent_buffer *leaf; 1320a5ed9182SOmar Sandoval u64 start, end; 1321a5ed9182SOmar Sandoval int done = 0, nr; 1322a5ed9182SOmar Sandoval int ret; 1323a5ed9182SOmar Sandoval 1324f3f72779SNikolay Borisov if (!btrfs_fs_compat_ro(trans->fs_info, FREE_SPACE_TREE)) 1325a5ed9182SOmar Sandoval return 0; 1326a5ed9182SOmar Sandoval 1327a5ed9182SOmar Sandoval if (block_group->needs_free_space) { 1328a5ed9182SOmar Sandoval /* We never added this block group to the free space tree. */ 1329a5ed9182SOmar Sandoval return 0; 1330a5ed9182SOmar Sandoval } 1331a5ed9182SOmar Sandoval 1332a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1333a5ed9182SOmar Sandoval if (!path) { 1334a5ed9182SOmar Sandoval ret = -ENOMEM; 1335a5ed9182SOmar Sandoval goto out; 1336a5ed9182SOmar Sandoval } 1337a5ed9182SOmar Sandoval 1338b3470b5dSDavid Sterba start = block_group->start; 1339b3470b5dSDavid Sterba end = block_group->start + block_group->length; 1340a5ed9182SOmar Sandoval 1341a5ed9182SOmar Sandoval key.objectid = end - 1; 1342a5ed9182SOmar Sandoval key.type = (u8)-1; 1343a5ed9182SOmar Sandoval key.offset = (u64)-1; 1344a5ed9182SOmar Sandoval 1345a5ed9182SOmar Sandoval while (!done) { 1346a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 1347a5ed9182SOmar Sandoval if (ret) 1348a5ed9182SOmar Sandoval goto out; 1349a5ed9182SOmar Sandoval 1350a5ed9182SOmar Sandoval leaf = path->nodes[0]; 1351a5ed9182SOmar Sandoval nr = 0; 1352a5ed9182SOmar Sandoval path->slots[0]++; 1353a5ed9182SOmar Sandoval while (path->slots[0] > 0) { 1354a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0] - 1); 1355a5ed9182SOmar Sandoval 1356a5ed9182SOmar Sandoval if (found_key.type == BTRFS_FREE_SPACE_INFO_KEY) { 1357b3470b5dSDavid Sterba ASSERT(found_key.objectid == block_group->start); 1358b3470b5dSDavid Sterba ASSERT(found_key.offset == block_group->length); 1359a5ed9182SOmar Sandoval done = 1; 1360a5ed9182SOmar Sandoval nr++; 1361a5ed9182SOmar Sandoval path->slots[0]--; 1362a5ed9182SOmar Sandoval break; 1363a5ed9182SOmar Sandoval } else if (found_key.type == BTRFS_FREE_SPACE_EXTENT_KEY || 1364a5ed9182SOmar Sandoval found_key.type == BTRFS_FREE_SPACE_BITMAP_KEY) { 1365a5ed9182SOmar Sandoval ASSERT(found_key.objectid >= start); 1366a5ed9182SOmar Sandoval ASSERT(found_key.objectid < end); 1367a5ed9182SOmar Sandoval ASSERT(found_key.objectid + found_key.offset <= end); 1368a5ed9182SOmar Sandoval nr++; 1369a5ed9182SOmar Sandoval path->slots[0]--; 1370a5ed9182SOmar Sandoval } else { 1371a5ed9182SOmar Sandoval ASSERT(0); 1372a5ed9182SOmar Sandoval } 1373a5ed9182SOmar Sandoval } 1374a5ed9182SOmar Sandoval 1375a5ed9182SOmar Sandoval ret = btrfs_del_items(trans, root, path, path->slots[0], nr); 1376a5ed9182SOmar Sandoval if (ret) 1377a5ed9182SOmar Sandoval goto out; 1378a5ed9182SOmar Sandoval btrfs_release_path(path); 1379a5ed9182SOmar Sandoval } 1380a5ed9182SOmar Sandoval 1381a5ed9182SOmar Sandoval ret = 0; 1382a5ed9182SOmar Sandoval out: 1383a5ed9182SOmar Sandoval btrfs_free_path(path); 1384a5ed9182SOmar Sandoval if (ret) 138566642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 1386a5ed9182SOmar Sandoval return ret; 1387a5ed9182SOmar Sandoval } 1388a5ed9182SOmar Sandoval 1389a5ed9182SOmar Sandoval static int load_free_space_bitmaps(struct btrfs_caching_control *caching_ctl, 1390a5ed9182SOmar Sandoval struct btrfs_path *path, 1391a5ed9182SOmar Sandoval u32 expected_extent_count) 1392a5ed9182SOmar Sandoval { 1393a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group; 1394a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info; 1395a5ed9182SOmar Sandoval struct btrfs_root *root; 1396a5ed9182SOmar Sandoval struct btrfs_key key; 1397a5ed9182SOmar Sandoval int prev_bit = 0, bit; 1398a5ed9182SOmar Sandoval /* Initialize to silence GCC. */ 1399a5ed9182SOmar Sandoval u64 extent_start = 0; 1400a5ed9182SOmar Sandoval u64 end, offset; 1401a5ed9182SOmar Sandoval u64 total_found = 0; 1402a5ed9182SOmar Sandoval u32 extent_count = 0; 1403a5ed9182SOmar Sandoval int ret; 1404a5ed9182SOmar Sandoval 1405a5ed9182SOmar Sandoval block_group = caching_ctl->block_group; 1406a5ed9182SOmar Sandoval fs_info = block_group->fs_info; 1407a5ed9182SOmar Sandoval root = fs_info->free_space_root; 1408a5ed9182SOmar Sandoval 1409b3470b5dSDavid Sterba end = block_group->start + block_group->length; 1410a5ed9182SOmar Sandoval 1411a5ed9182SOmar Sandoval while (1) { 1412a5ed9182SOmar Sandoval ret = btrfs_next_item(root, path); 1413a5ed9182SOmar Sandoval if (ret < 0) 1414a5ed9182SOmar Sandoval goto out; 1415a5ed9182SOmar Sandoval if (ret) 1416a5ed9182SOmar Sandoval break; 1417a5ed9182SOmar Sandoval 1418a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 1419a5ed9182SOmar Sandoval 1420a5ed9182SOmar Sandoval if (key.type == BTRFS_FREE_SPACE_INFO_KEY) 1421a5ed9182SOmar Sandoval break; 1422a5ed9182SOmar Sandoval 1423a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_BITMAP_KEY); 1424a5ed9182SOmar Sandoval ASSERT(key.objectid < end && key.objectid + key.offset <= end); 1425a5ed9182SOmar Sandoval 1426a5ed9182SOmar Sandoval caching_ctl->progress = key.objectid; 1427a5ed9182SOmar Sandoval 1428a5ed9182SOmar Sandoval offset = key.objectid; 1429a5ed9182SOmar Sandoval while (offset < key.objectid + key.offset) { 1430a5ed9182SOmar Sandoval bit = free_space_test_bit(block_group, path, offset); 1431a5ed9182SOmar Sandoval if (prev_bit == 0 && bit == 1) { 1432a5ed9182SOmar Sandoval extent_start = offset; 1433a5ed9182SOmar Sandoval } else if (prev_bit == 1 && bit == 0) { 1434a5ed9182SOmar Sandoval total_found += add_new_free_space(block_group, 1435a5ed9182SOmar Sandoval extent_start, 1436a5ed9182SOmar Sandoval offset); 1437a5ed9182SOmar Sandoval if (total_found > CACHING_CTL_WAKE_UP) { 1438a5ed9182SOmar Sandoval total_found = 0; 1439a5ed9182SOmar Sandoval wake_up(&caching_ctl->wait); 1440a5ed9182SOmar Sandoval } 1441a5ed9182SOmar Sandoval extent_count++; 1442a5ed9182SOmar Sandoval } 1443a5ed9182SOmar Sandoval prev_bit = bit; 14440b246afaSJeff Mahoney offset += fs_info->sectorsize; 1445a5ed9182SOmar Sandoval } 1446a5ed9182SOmar Sandoval } 1447a5ed9182SOmar Sandoval if (prev_bit == 1) { 14484457c1c7SNikolay Borisov total_found += add_new_free_space(block_group, extent_start, 14494457c1c7SNikolay Borisov end); 1450a5ed9182SOmar Sandoval extent_count++; 1451a5ed9182SOmar Sandoval } 1452a5ed9182SOmar Sandoval 1453a5ed9182SOmar Sandoval if (extent_count != expected_extent_count) { 14545d163e0eSJeff Mahoney btrfs_err(fs_info, 14555d163e0eSJeff Mahoney "incorrect extent count for %llu; counted %u, expected %u", 1456b3470b5dSDavid Sterba block_group->start, extent_count, 1457a5ed9182SOmar Sandoval expected_extent_count); 1458a5ed9182SOmar Sandoval ASSERT(0); 1459a5ed9182SOmar Sandoval ret = -EIO; 1460a5ed9182SOmar Sandoval goto out; 1461a5ed9182SOmar Sandoval } 1462a5ed9182SOmar Sandoval 1463a5ed9182SOmar Sandoval caching_ctl->progress = (u64)-1; 1464a5ed9182SOmar Sandoval 1465a5ed9182SOmar Sandoval ret = 0; 1466a5ed9182SOmar Sandoval out: 1467a5ed9182SOmar Sandoval return ret; 1468a5ed9182SOmar Sandoval } 1469a5ed9182SOmar Sandoval 1470a5ed9182SOmar Sandoval static int load_free_space_extents(struct btrfs_caching_control *caching_ctl, 1471a5ed9182SOmar Sandoval struct btrfs_path *path, 1472a5ed9182SOmar Sandoval u32 expected_extent_count) 1473a5ed9182SOmar Sandoval { 1474a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group; 1475a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info; 1476a5ed9182SOmar Sandoval struct btrfs_root *root; 1477a5ed9182SOmar Sandoval struct btrfs_key key; 1478a5ed9182SOmar Sandoval u64 end; 1479a5ed9182SOmar Sandoval u64 total_found = 0; 1480a5ed9182SOmar Sandoval u32 extent_count = 0; 1481a5ed9182SOmar Sandoval int ret; 1482a5ed9182SOmar Sandoval 1483a5ed9182SOmar Sandoval block_group = caching_ctl->block_group; 1484a5ed9182SOmar Sandoval fs_info = block_group->fs_info; 1485a5ed9182SOmar Sandoval root = fs_info->free_space_root; 1486a5ed9182SOmar Sandoval 1487b3470b5dSDavid Sterba end = block_group->start + block_group->length; 1488a5ed9182SOmar Sandoval 1489a5ed9182SOmar Sandoval while (1) { 1490a5ed9182SOmar Sandoval ret = btrfs_next_item(root, path); 1491a5ed9182SOmar Sandoval if (ret < 0) 1492a5ed9182SOmar Sandoval goto out; 1493a5ed9182SOmar Sandoval if (ret) 1494a5ed9182SOmar Sandoval break; 1495a5ed9182SOmar Sandoval 1496a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 1497a5ed9182SOmar Sandoval 1498a5ed9182SOmar Sandoval if (key.type == BTRFS_FREE_SPACE_INFO_KEY) 1499a5ed9182SOmar Sandoval break; 1500a5ed9182SOmar Sandoval 1501a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_EXTENT_KEY); 1502a5ed9182SOmar Sandoval ASSERT(key.objectid < end && key.objectid + key.offset <= end); 1503a5ed9182SOmar Sandoval 1504a5ed9182SOmar Sandoval caching_ctl->progress = key.objectid; 1505a5ed9182SOmar Sandoval 15064457c1c7SNikolay Borisov total_found += add_new_free_space(block_group, key.objectid, 1507a5ed9182SOmar Sandoval key.objectid + key.offset); 1508a5ed9182SOmar Sandoval if (total_found > CACHING_CTL_WAKE_UP) { 1509a5ed9182SOmar Sandoval total_found = 0; 1510a5ed9182SOmar Sandoval wake_up(&caching_ctl->wait); 1511a5ed9182SOmar Sandoval } 1512a5ed9182SOmar Sandoval extent_count++; 1513a5ed9182SOmar Sandoval } 1514a5ed9182SOmar Sandoval 1515a5ed9182SOmar Sandoval if (extent_count != expected_extent_count) { 15165d163e0eSJeff Mahoney btrfs_err(fs_info, 15175d163e0eSJeff Mahoney "incorrect extent count for %llu; counted %u, expected %u", 1518b3470b5dSDavid Sterba block_group->start, extent_count, 1519a5ed9182SOmar Sandoval expected_extent_count); 1520a5ed9182SOmar Sandoval ASSERT(0); 1521a5ed9182SOmar Sandoval ret = -EIO; 1522a5ed9182SOmar Sandoval goto out; 1523a5ed9182SOmar Sandoval } 1524a5ed9182SOmar Sandoval 1525a5ed9182SOmar Sandoval caching_ctl->progress = (u64)-1; 1526a5ed9182SOmar Sandoval 1527a5ed9182SOmar Sandoval ret = 0; 1528a5ed9182SOmar Sandoval out: 1529a5ed9182SOmar Sandoval return ret; 1530a5ed9182SOmar Sandoval } 1531a5ed9182SOmar Sandoval 1532a5ed9182SOmar Sandoval int load_free_space_tree(struct btrfs_caching_control *caching_ctl) 1533a5ed9182SOmar Sandoval { 1534a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group; 1535a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 1536a5ed9182SOmar Sandoval struct btrfs_path *path; 1537a5ed9182SOmar Sandoval u32 extent_count, flags; 1538a5ed9182SOmar Sandoval int ret; 1539a5ed9182SOmar Sandoval 1540a5ed9182SOmar Sandoval block_group = caching_ctl->block_group; 1541a5ed9182SOmar Sandoval 1542a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1543a5ed9182SOmar Sandoval if (!path) 1544a5ed9182SOmar Sandoval return -ENOMEM; 1545a5ed9182SOmar Sandoval 1546a5ed9182SOmar Sandoval /* 1547a5ed9182SOmar Sandoval * Just like caching_thread() doesn't want to deadlock on the extent 1548a5ed9182SOmar Sandoval * tree, we don't want to deadlock on the free space tree. 1549a5ed9182SOmar Sandoval */ 1550a5ed9182SOmar Sandoval path->skip_locking = 1; 1551a5ed9182SOmar Sandoval path->search_commit_root = 1; 15527ce311d5SGu JinXiang path->reada = READA_FORWARD; 1553a5ed9182SOmar Sandoval 15542ccf545eSDavid Sterba info = search_free_space_info(NULL, block_group, path, 0); 1555a5ed9182SOmar Sandoval if (IS_ERR(info)) { 1556a5ed9182SOmar Sandoval ret = PTR_ERR(info); 1557a5ed9182SOmar Sandoval goto out; 1558a5ed9182SOmar Sandoval } 1559a5ed9182SOmar Sandoval extent_count = btrfs_free_space_extent_count(path->nodes[0], info); 1560a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(path->nodes[0], info); 1561a5ed9182SOmar Sandoval 1562a5ed9182SOmar Sandoval /* 1563a5ed9182SOmar Sandoval * We left path pointing to the free space info item, so now 1564a5ed9182SOmar Sandoval * load_free_space_foo can just iterate through the free space tree from 1565a5ed9182SOmar Sandoval * there. 1566a5ed9182SOmar Sandoval */ 1567a5ed9182SOmar Sandoval if (flags & BTRFS_FREE_SPACE_USING_BITMAPS) 1568a5ed9182SOmar Sandoval ret = load_free_space_bitmaps(caching_ctl, path, extent_count); 1569a5ed9182SOmar Sandoval else 1570a5ed9182SOmar Sandoval ret = load_free_space_extents(caching_ctl, path, extent_count); 1571a5ed9182SOmar Sandoval 1572a5ed9182SOmar Sandoval out: 1573a5ed9182SOmar Sandoval btrfs_free_path(path); 1574a5ed9182SOmar Sandoval return ret; 1575a5ed9182SOmar Sandoval } 1576