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" 13a5ed9182SOmar Sandoval 14a5ed9182SOmar Sandoval static int __add_block_group_free_space(struct btrfs_trans_handle *trans, 15a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group, 16a5ed9182SOmar Sandoval struct btrfs_path *path); 17a5ed9182SOmar Sandoval 18a5ed9182SOmar Sandoval void set_free_space_tree_thresholds(struct btrfs_block_group_cache *cache) 19a5ed9182SOmar Sandoval { 20a5ed9182SOmar Sandoval u32 bitmap_range; 21a5ed9182SOmar Sandoval size_t bitmap_size; 22a5ed9182SOmar Sandoval u64 num_bitmaps, total_bitmap_size; 23a5ed9182SOmar Sandoval 24a5ed9182SOmar Sandoval /* 25a5ed9182SOmar Sandoval * We convert to bitmaps when the disk space required for using extents 26a5ed9182SOmar Sandoval * exceeds that required for using bitmaps. 27a5ed9182SOmar Sandoval */ 28da17066cSJeff Mahoney bitmap_range = cache->fs_info->sectorsize * BTRFS_FREE_SPACE_BITMAP_BITS; 29a5ed9182SOmar Sandoval num_bitmaps = div_u64(cache->key.offset + bitmap_range - 1, 30a5ed9182SOmar Sandoval 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 56a5ed9182SOmar Sandoval key.objectid = block_group->key.objectid; 57a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_INFO_KEY; 58a5ed9182SOmar Sandoval key.offset = block_group->key.offset; 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 77a5ed9182SOmar Sandoval struct btrfs_free_space_info * 78a5ed9182SOmar Sandoval search_free_space_info(struct btrfs_trans_handle *trans, 79a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info, 80a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group, 81a5ed9182SOmar Sandoval struct btrfs_path *path, int cow) 82a5ed9182SOmar Sandoval { 83a5ed9182SOmar Sandoval struct btrfs_root *root = fs_info->free_space_root; 84a5ed9182SOmar Sandoval struct btrfs_key key; 85a5ed9182SOmar Sandoval int ret; 86a5ed9182SOmar Sandoval 87a5ed9182SOmar Sandoval key.objectid = block_group->key.objectid; 88a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_INFO_KEY; 89a5ed9182SOmar Sandoval key.offset = block_group->key.offset; 90a5ed9182SOmar Sandoval 91a5ed9182SOmar Sandoval ret = btrfs_search_slot(trans, root, &key, path, 0, cow); 92a5ed9182SOmar Sandoval if (ret < 0) 93a5ed9182SOmar Sandoval return ERR_PTR(ret); 94a5ed9182SOmar Sandoval if (ret != 0) { 95ab8d0fc4SJeff Mahoney btrfs_warn(fs_info, "missing free space info for %llu", 96a5ed9182SOmar Sandoval block_group->key.objectid); 97a5ed9182SOmar Sandoval ASSERT(0); 98a5ed9182SOmar Sandoval return ERR_PTR(-ENOENT); 99a5ed9182SOmar Sandoval } 100a5ed9182SOmar Sandoval 101a5ed9182SOmar Sandoval return btrfs_item_ptr(path->nodes[0], path->slots[0], 102a5ed9182SOmar Sandoval struct btrfs_free_space_info); 103a5ed9182SOmar Sandoval } 104a5ed9182SOmar Sandoval 105a5ed9182SOmar Sandoval /* 106a5ed9182SOmar Sandoval * btrfs_search_slot() but we're looking for the greatest key less than the 107a5ed9182SOmar Sandoval * passed key. 108a5ed9182SOmar Sandoval */ 109a5ed9182SOmar Sandoval static int btrfs_search_prev_slot(struct btrfs_trans_handle *trans, 110a5ed9182SOmar Sandoval struct btrfs_root *root, 111a5ed9182SOmar Sandoval struct btrfs_key *key, struct btrfs_path *p, 112a5ed9182SOmar Sandoval int ins_len, int cow) 113a5ed9182SOmar Sandoval { 114a5ed9182SOmar Sandoval int ret; 115a5ed9182SOmar Sandoval 116a5ed9182SOmar Sandoval ret = btrfs_search_slot(trans, root, key, p, ins_len, cow); 117a5ed9182SOmar Sandoval if (ret < 0) 118a5ed9182SOmar Sandoval return ret; 119a5ed9182SOmar Sandoval 120a5ed9182SOmar Sandoval if (ret == 0) { 121a5ed9182SOmar Sandoval ASSERT(0); 122a5ed9182SOmar Sandoval return -EIO; 123a5ed9182SOmar Sandoval } 124a5ed9182SOmar Sandoval 125a5ed9182SOmar Sandoval if (p->slots[0] == 0) { 126a5ed9182SOmar Sandoval ASSERT(0); 127a5ed9182SOmar Sandoval return -EIO; 128a5ed9182SOmar Sandoval } 129a5ed9182SOmar Sandoval p->slots[0]--; 130a5ed9182SOmar Sandoval 131a5ed9182SOmar Sandoval return 0; 132a5ed9182SOmar Sandoval } 133a5ed9182SOmar Sandoval 134a5ed9182SOmar Sandoval static inline u32 free_space_bitmap_size(u64 size, u32 sectorsize) 135a5ed9182SOmar Sandoval { 136a5ed9182SOmar Sandoval return DIV_ROUND_UP((u32)div_u64(size, sectorsize), BITS_PER_BYTE); 137a5ed9182SOmar Sandoval } 138a5ed9182SOmar Sandoval 139a565971fSHoward McLauchlan static unsigned long *alloc_bitmap(u32 bitmap_size) 140a5ed9182SOmar Sandoval { 141a565971fSHoward McLauchlan unsigned long *ret; 14225ff17e8SOmar Sandoval unsigned int nofs_flag; 143a565971fSHoward McLauchlan u32 bitmap_rounded_size = round_up(bitmap_size, sizeof(unsigned long)); 14479b134a2SDavid Sterba 14579b134a2SDavid Sterba /* 14625ff17e8SOmar Sandoval * GFP_NOFS doesn't work with kvmalloc(), but we really can't recurse 14725ff17e8SOmar Sandoval * into the filesystem as the free space bitmap can be modified in the 14825ff17e8SOmar Sandoval * critical section of a transaction commit. 14925ff17e8SOmar Sandoval * 15025ff17e8SOmar Sandoval * TODO: push the memalloc_nofs_{save,restore}() to the caller where we 15125ff17e8SOmar Sandoval * know that recursion is unsafe. 15279b134a2SDavid Sterba */ 15325ff17e8SOmar Sandoval nofs_flag = memalloc_nofs_save(); 154a565971fSHoward McLauchlan ret = kvzalloc(bitmap_rounded_size, GFP_KERNEL); 15525ff17e8SOmar Sandoval memalloc_nofs_restore(nofs_flag); 15625ff17e8SOmar Sandoval return ret; 157a5ed9182SOmar Sandoval } 158a5ed9182SOmar Sandoval 159a565971fSHoward McLauchlan static void le_bitmap_set(unsigned long *map, unsigned int start, int len) 1606faa8f47SHoward McLauchlan { 161a565971fSHoward McLauchlan u8 *p = ((u8 *)map) + BIT_BYTE(start); 1626faa8f47SHoward McLauchlan const unsigned int size = start + len; 1636faa8f47SHoward McLauchlan int bits_to_set = BITS_PER_BYTE - (start % BITS_PER_BYTE); 1646faa8f47SHoward McLauchlan u8 mask_to_set = BITMAP_FIRST_BYTE_MASK(start); 1656faa8f47SHoward McLauchlan 1666faa8f47SHoward McLauchlan while (len - bits_to_set >= 0) { 1676faa8f47SHoward McLauchlan *p |= mask_to_set; 1686faa8f47SHoward McLauchlan len -= bits_to_set; 1696faa8f47SHoward McLauchlan bits_to_set = BITS_PER_BYTE; 1706faa8f47SHoward McLauchlan mask_to_set = ~0; 1716faa8f47SHoward McLauchlan p++; 1726faa8f47SHoward McLauchlan } 1736faa8f47SHoward McLauchlan if (len) { 1746faa8f47SHoward McLauchlan mask_to_set &= BITMAP_LAST_BYTE_MASK(size); 1756faa8f47SHoward McLauchlan *p |= mask_to_set; 1766faa8f47SHoward McLauchlan } 1776faa8f47SHoward McLauchlan } 1786faa8f47SHoward McLauchlan 179a5ed9182SOmar Sandoval int convert_free_space_to_bitmaps(struct btrfs_trans_handle *trans, 180a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group, 181a5ed9182SOmar Sandoval struct btrfs_path *path) 182a5ed9182SOmar Sandoval { 183719fb4deSNikolay Borisov struct btrfs_fs_info *fs_info = trans->fs_info; 184a5ed9182SOmar Sandoval struct btrfs_root *root = fs_info->free_space_root; 185a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 186a5ed9182SOmar Sandoval struct btrfs_key key, found_key; 187a5ed9182SOmar Sandoval struct extent_buffer *leaf; 188a565971fSHoward McLauchlan unsigned long *bitmap; 189a565971fSHoward McLauchlan char *bitmap_cursor; 190a5ed9182SOmar Sandoval u64 start, end; 191a5ed9182SOmar Sandoval u64 bitmap_range, i; 192a5ed9182SOmar Sandoval u32 bitmap_size, flags, expected_extent_count; 193a5ed9182SOmar Sandoval u32 extent_count = 0; 194a5ed9182SOmar Sandoval int done = 0, nr; 195a5ed9182SOmar Sandoval int ret; 196a5ed9182SOmar Sandoval 197a5ed9182SOmar Sandoval bitmap_size = free_space_bitmap_size(block_group->key.offset, 1980b246afaSJeff Mahoney fs_info->sectorsize); 199a5ed9182SOmar Sandoval bitmap = alloc_bitmap(bitmap_size); 200a5ed9182SOmar Sandoval if (!bitmap) { 201a5ed9182SOmar Sandoval ret = -ENOMEM; 202a5ed9182SOmar Sandoval goto out; 203a5ed9182SOmar Sandoval } 204a5ed9182SOmar Sandoval 205a5ed9182SOmar Sandoval start = block_group->key.objectid; 206a5ed9182SOmar Sandoval end = block_group->key.objectid + block_group->key.offset; 207a5ed9182SOmar Sandoval 208a5ed9182SOmar Sandoval key.objectid = end - 1; 209a5ed9182SOmar Sandoval key.type = (u8)-1; 210a5ed9182SOmar Sandoval key.offset = (u64)-1; 211a5ed9182SOmar Sandoval 212a5ed9182SOmar Sandoval while (!done) { 213a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 214a5ed9182SOmar Sandoval if (ret) 215a5ed9182SOmar Sandoval goto out; 216a5ed9182SOmar Sandoval 217a5ed9182SOmar Sandoval leaf = path->nodes[0]; 218a5ed9182SOmar Sandoval nr = 0; 219a5ed9182SOmar Sandoval path->slots[0]++; 220a5ed9182SOmar Sandoval while (path->slots[0] > 0) { 221a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0] - 1); 222a5ed9182SOmar Sandoval 223a5ed9182SOmar Sandoval if (found_key.type == BTRFS_FREE_SPACE_INFO_KEY) { 224a5ed9182SOmar Sandoval ASSERT(found_key.objectid == block_group->key.objectid); 225a5ed9182SOmar Sandoval ASSERT(found_key.offset == block_group->key.offset); 226a5ed9182SOmar Sandoval done = 1; 227a5ed9182SOmar Sandoval break; 228a5ed9182SOmar Sandoval } else if (found_key.type == BTRFS_FREE_SPACE_EXTENT_KEY) { 229a5ed9182SOmar Sandoval u64 first, last; 230a5ed9182SOmar Sandoval 231a5ed9182SOmar Sandoval ASSERT(found_key.objectid >= start); 232a5ed9182SOmar Sandoval ASSERT(found_key.objectid < end); 233a5ed9182SOmar Sandoval ASSERT(found_key.objectid + found_key.offset <= end); 234a5ed9182SOmar Sandoval 235a5ed9182SOmar Sandoval first = div_u64(found_key.objectid - start, 2360b246afaSJeff Mahoney fs_info->sectorsize); 237a5ed9182SOmar Sandoval last = div_u64(found_key.objectid + found_key.offset - start, 2380b246afaSJeff Mahoney fs_info->sectorsize); 2392fe1d551SOmar Sandoval le_bitmap_set(bitmap, first, last - first); 240a5ed9182SOmar Sandoval 241a5ed9182SOmar Sandoval extent_count++; 242a5ed9182SOmar Sandoval nr++; 243a5ed9182SOmar Sandoval path->slots[0]--; 244a5ed9182SOmar Sandoval } else { 245a5ed9182SOmar Sandoval ASSERT(0); 246a5ed9182SOmar Sandoval } 247a5ed9182SOmar Sandoval } 248a5ed9182SOmar Sandoval 249a5ed9182SOmar Sandoval ret = btrfs_del_items(trans, root, path, path->slots[0], nr); 250a5ed9182SOmar Sandoval if (ret) 251a5ed9182SOmar Sandoval goto out; 252a5ed9182SOmar Sandoval btrfs_release_path(path); 253a5ed9182SOmar Sandoval } 254a5ed9182SOmar Sandoval 255a5ed9182SOmar Sandoval info = search_free_space_info(trans, fs_info, block_group, path, 1); 256a5ed9182SOmar Sandoval if (IS_ERR(info)) { 257a5ed9182SOmar Sandoval ret = PTR_ERR(info); 258a5ed9182SOmar Sandoval goto out; 259a5ed9182SOmar Sandoval } 260a5ed9182SOmar Sandoval leaf = path->nodes[0]; 261a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(leaf, info); 262a5ed9182SOmar Sandoval flags |= BTRFS_FREE_SPACE_USING_BITMAPS; 263a5ed9182SOmar Sandoval btrfs_set_free_space_flags(leaf, info, flags); 264a5ed9182SOmar Sandoval expected_extent_count = btrfs_free_space_extent_count(leaf, info); 265a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 266a5ed9182SOmar Sandoval btrfs_release_path(path); 267a5ed9182SOmar Sandoval 268a5ed9182SOmar Sandoval if (extent_count != expected_extent_count) { 2695d163e0eSJeff Mahoney btrfs_err(fs_info, 2705d163e0eSJeff Mahoney "incorrect extent count for %llu; counted %u, expected %u", 271a5ed9182SOmar Sandoval block_group->key.objectid, extent_count, 272a5ed9182SOmar Sandoval expected_extent_count); 273a5ed9182SOmar Sandoval ASSERT(0); 274a5ed9182SOmar Sandoval ret = -EIO; 275a5ed9182SOmar Sandoval goto out; 276a5ed9182SOmar Sandoval } 277a5ed9182SOmar Sandoval 278a565971fSHoward McLauchlan bitmap_cursor = (char *)bitmap; 2790b246afaSJeff Mahoney bitmap_range = fs_info->sectorsize * BTRFS_FREE_SPACE_BITMAP_BITS; 280a5ed9182SOmar Sandoval i = start; 281a5ed9182SOmar Sandoval while (i < end) { 282a5ed9182SOmar Sandoval unsigned long ptr; 283a5ed9182SOmar Sandoval u64 extent_size; 284a5ed9182SOmar Sandoval u32 data_size; 285a5ed9182SOmar Sandoval 286a5ed9182SOmar Sandoval extent_size = min(end - i, bitmap_range); 287a5ed9182SOmar Sandoval data_size = free_space_bitmap_size(extent_size, 2880b246afaSJeff Mahoney fs_info->sectorsize); 289a5ed9182SOmar Sandoval 290a5ed9182SOmar Sandoval key.objectid = i; 291a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_BITMAP_KEY; 292a5ed9182SOmar Sandoval key.offset = extent_size; 293a5ed9182SOmar Sandoval 294a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, 295a5ed9182SOmar Sandoval data_size); 296a5ed9182SOmar Sandoval if (ret) 297a5ed9182SOmar Sandoval goto out; 298a5ed9182SOmar Sandoval 299a5ed9182SOmar Sandoval leaf = path->nodes[0]; 300a5ed9182SOmar Sandoval ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); 301a5ed9182SOmar Sandoval write_extent_buffer(leaf, bitmap_cursor, ptr, 302a5ed9182SOmar Sandoval data_size); 303a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 304a5ed9182SOmar Sandoval btrfs_release_path(path); 305a5ed9182SOmar Sandoval 306a5ed9182SOmar Sandoval i += extent_size; 307a5ed9182SOmar Sandoval bitmap_cursor += data_size; 308a5ed9182SOmar Sandoval } 309a5ed9182SOmar Sandoval 310a5ed9182SOmar Sandoval ret = 0; 311a5ed9182SOmar Sandoval out: 31279b134a2SDavid Sterba kvfree(bitmap); 313a5ed9182SOmar Sandoval if (ret) 31466642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 315a5ed9182SOmar Sandoval return ret; 316a5ed9182SOmar Sandoval } 317a5ed9182SOmar Sandoval 318a5ed9182SOmar Sandoval int convert_free_space_to_extents(struct btrfs_trans_handle *trans, 319a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group, 320a5ed9182SOmar Sandoval struct btrfs_path *path) 321a5ed9182SOmar Sandoval { 3225296c2bfSNikolay Borisov struct btrfs_fs_info *fs_info = trans->fs_info; 323a5ed9182SOmar Sandoval struct btrfs_root *root = fs_info->free_space_root; 324a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 325a5ed9182SOmar Sandoval struct btrfs_key key, found_key; 326a5ed9182SOmar Sandoval struct extent_buffer *leaf; 327a565971fSHoward McLauchlan unsigned long *bitmap; 328a5ed9182SOmar Sandoval u64 start, end; 329a5ed9182SOmar Sandoval u32 bitmap_size, flags, expected_extent_count; 330a565971fSHoward McLauchlan unsigned long nrbits, start_bit, end_bit; 331a5ed9182SOmar Sandoval u32 extent_count = 0; 332a5ed9182SOmar Sandoval int done = 0, nr; 333a5ed9182SOmar Sandoval int ret; 334a5ed9182SOmar Sandoval 335a5ed9182SOmar Sandoval bitmap_size = free_space_bitmap_size(block_group->key.offset, 3360b246afaSJeff Mahoney fs_info->sectorsize); 337a5ed9182SOmar Sandoval bitmap = alloc_bitmap(bitmap_size); 338a5ed9182SOmar Sandoval if (!bitmap) { 339a5ed9182SOmar Sandoval ret = -ENOMEM; 340a5ed9182SOmar Sandoval goto out; 341a5ed9182SOmar Sandoval } 342a5ed9182SOmar Sandoval 343a5ed9182SOmar Sandoval start = block_group->key.objectid; 344a5ed9182SOmar Sandoval end = block_group->key.objectid + block_group->key.offset; 345a5ed9182SOmar Sandoval 346a5ed9182SOmar Sandoval key.objectid = end - 1; 347a5ed9182SOmar Sandoval key.type = (u8)-1; 348a5ed9182SOmar Sandoval key.offset = (u64)-1; 349a5ed9182SOmar Sandoval 350a5ed9182SOmar Sandoval while (!done) { 351a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 352a5ed9182SOmar Sandoval if (ret) 353a5ed9182SOmar Sandoval goto out; 354a5ed9182SOmar Sandoval 355a5ed9182SOmar Sandoval leaf = path->nodes[0]; 356a5ed9182SOmar Sandoval nr = 0; 357a5ed9182SOmar Sandoval path->slots[0]++; 358a5ed9182SOmar Sandoval while (path->slots[0] > 0) { 359a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0] - 1); 360a5ed9182SOmar Sandoval 361a5ed9182SOmar Sandoval if (found_key.type == BTRFS_FREE_SPACE_INFO_KEY) { 362a5ed9182SOmar Sandoval ASSERT(found_key.objectid == block_group->key.objectid); 363a5ed9182SOmar Sandoval ASSERT(found_key.offset == block_group->key.offset); 364a5ed9182SOmar Sandoval done = 1; 365a5ed9182SOmar Sandoval break; 366a5ed9182SOmar Sandoval } else if (found_key.type == BTRFS_FREE_SPACE_BITMAP_KEY) { 367a5ed9182SOmar Sandoval unsigned long ptr; 368a565971fSHoward McLauchlan char *bitmap_cursor; 369a5ed9182SOmar Sandoval u32 bitmap_pos, data_size; 370a5ed9182SOmar Sandoval 371a5ed9182SOmar Sandoval ASSERT(found_key.objectid >= start); 372a5ed9182SOmar Sandoval ASSERT(found_key.objectid < end); 373a5ed9182SOmar Sandoval ASSERT(found_key.objectid + found_key.offset <= end); 374a5ed9182SOmar Sandoval 375a5ed9182SOmar Sandoval bitmap_pos = div_u64(found_key.objectid - start, 3760b246afaSJeff Mahoney fs_info->sectorsize * 377a5ed9182SOmar Sandoval BITS_PER_BYTE); 378a565971fSHoward McLauchlan bitmap_cursor = ((char *)bitmap) + bitmap_pos; 379a5ed9182SOmar Sandoval data_size = free_space_bitmap_size(found_key.offset, 3800b246afaSJeff Mahoney fs_info->sectorsize); 381a5ed9182SOmar Sandoval 382a5ed9182SOmar Sandoval ptr = btrfs_item_ptr_offset(leaf, path->slots[0] - 1); 383a5ed9182SOmar Sandoval read_extent_buffer(leaf, bitmap_cursor, ptr, 384a5ed9182SOmar Sandoval data_size); 385a5ed9182SOmar Sandoval 386a5ed9182SOmar Sandoval nr++; 387a5ed9182SOmar Sandoval path->slots[0]--; 388a5ed9182SOmar Sandoval } else { 389a5ed9182SOmar Sandoval ASSERT(0); 390a5ed9182SOmar Sandoval } 391a5ed9182SOmar Sandoval } 392a5ed9182SOmar Sandoval 393a5ed9182SOmar Sandoval ret = btrfs_del_items(trans, root, path, path->slots[0], nr); 394a5ed9182SOmar Sandoval if (ret) 395a5ed9182SOmar Sandoval goto out; 396a5ed9182SOmar Sandoval btrfs_release_path(path); 397a5ed9182SOmar Sandoval } 398a5ed9182SOmar Sandoval 399a5ed9182SOmar Sandoval info = search_free_space_info(trans, fs_info, block_group, path, 1); 400a5ed9182SOmar Sandoval if (IS_ERR(info)) { 401a5ed9182SOmar Sandoval ret = PTR_ERR(info); 402a5ed9182SOmar Sandoval goto out; 403a5ed9182SOmar Sandoval } 404a5ed9182SOmar Sandoval leaf = path->nodes[0]; 405a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(leaf, info); 406a5ed9182SOmar Sandoval flags &= ~BTRFS_FREE_SPACE_USING_BITMAPS; 407a5ed9182SOmar Sandoval btrfs_set_free_space_flags(leaf, info, flags); 408a5ed9182SOmar Sandoval expected_extent_count = btrfs_free_space_extent_count(leaf, info); 409a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 410a5ed9182SOmar Sandoval btrfs_release_path(path); 411a5ed9182SOmar Sandoval 412a565971fSHoward McLauchlan nrbits = div_u64(block_group->key.offset, block_group->fs_info->sectorsize); 413a565971fSHoward McLauchlan start_bit = find_next_bit_le(bitmap, nrbits, 0); 414a565971fSHoward McLauchlan 415a565971fSHoward McLauchlan while (start_bit < nrbits) { 416a565971fSHoward McLauchlan end_bit = find_next_zero_bit_le(bitmap, nrbits, start_bit); 417a565971fSHoward McLauchlan ASSERT(start_bit < end_bit); 418a565971fSHoward McLauchlan 419a565971fSHoward McLauchlan key.objectid = start + start_bit * block_group->fs_info->sectorsize; 420a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_EXTENT_KEY; 421a565971fSHoward McLauchlan key.offset = (end_bit - start_bit) * block_group->fs_info->sectorsize; 422a5ed9182SOmar Sandoval 423a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, 0); 424a5ed9182SOmar Sandoval if (ret) 425a5ed9182SOmar Sandoval goto out; 426a5ed9182SOmar Sandoval btrfs_release_path(path); 427a5ed9182SOmar Sandoval 428a5ed9182SOmar Sandoval extent_count++; 429a5ed9182SOmar Sandoval 430a565971fSHoward McLauchlan start_bit = find_next_bit_le(bitmap, nrbits, end_bit); 431a5ed9182SOmar Sandoval } 432a5ed9182SOmar Sandoval 433a5ed9182SOmar Sandoval if (extent_count != expected_extent_count) { 4345d163e0eSJeff Mahoney btrfs_err(fs_info, 4355d163e0eSJeff Mahoney "incorrect extent count for %llu; counted %u, expected %u", 436a5ed9182SOmar Sandoval block_group->key.objectid, extent_count, 437a5ed9182SOmar Sandoval expected_extent_count); 438a5ed9182SOmar Sandoval ASSERT(0); 439a5ed9182SOmar Sandoval ret = -EIO; 440a5ed9182SOmar Sandoval goto out; 441a5ed9182SOmar Sandoval } 442a5ed9182SOmar Sandoval 443a5ed9182SOmar Sandoval ret = 0; 444a5ed9182SOmar Sandoval out: 44579b134a2SDavid Sterba kvfree(bitmap); 446a5ed9182SOmar Sandoval if (ret) 44766642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 448a5ed9182SOmar Sandoval return ret; 449a5ed9182SOmar Sandoval } 450a5ed9182SOmar Sandoval 451a5ed9182SOmar Sandoval static int update_free_space_extent_count(struct btrfs_trans_handle *trans, 452a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group, 453a5ed9182SOmar Sandoval struct btrfs_path *path, 454a5ed9182SOmar Sandoval int new_extents) 455a5ed9182SOmar Sandoval { 456a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 457a5ed9182SOmar Sandoval u32 flags; 458a5ed9182SOmar Sandoval u32 extent_count; 459a5ed9182SOmar Sandoval int ret = 0; 460a5ed9182SOmar Sandoval 461a5ed9182SOmar Sandoval if (new_extents == 0) 462a5ed9182SOmar Sandoval return 0; 463a5ed9182SOmar Sandoval 464690d7682SNikolay Borisov info = search_free_space_info(trans, trans->fs_info, block_group, path, 465690d7682SNikolay Borisov 1); 466a5ed9182SOmar Sandoval if (IS_ERR(info)) { 467a5ed9182SOmar Sandoval ret = PTR_ERR(info); 468a5ed9182SOmar Sandoval goto out; 469a5ed9182SOmar Sandoval } 470a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(path->nodes[0], info); 471a5ed9182SOmar Sandoval extent_count = btrfs_free_space_extent_count(path->nodes[0], info); 472a5ed9182SOmar Sandoval 473a5ed9182SOmar Sandoval extent_count += new_extents; 474a5ed9182SOmar Sandoval btrfs_set_free_space_extent_count(path->nodes[0], info, extent_count); 475a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(path->nodes[0]); 476a5ed9182SOmar Sandoval btrfs_release_path(path); 477a5ed9182SOmar Sandoval 478a5ed9182SOmar Sandoval if (!(flags & BTRFS_FREE_SPACE_USING_BITMAPS) && 479a5ed9182SOmar Sandoval extent_count > block_group->bitmap_high_thresh) { 480719fb4deSNikolay Borisov ret = convert_free_space_to_bitmaps(trans, block_group, path); 481a5ed9182SOmar Sandoval } else if ((flags & BTRFS_FREE_SPACE_USING_BITMAPS) && 482a5ed9182SOmar Sandoval extent_count < block_group->bitmap_low_thresh) { 4835296c2bfSNikolay Borisov ret = convert_free_space_to_extents(trans, block_group, path); 484a5ed9182SOmar Sandoval } 485a5ed9182SOmar Sandoval 486a5ed9182SOmar Sandoval out: 487a5ed9182SOmar Sandoval return ret; 488a5ed9182SOmar Sandoval } 489a5ed9182SOmar Sandoval 490a5ed9182SOmar Sandoval int free_space_test_bit(struct btrfs_block_group_cache *block_group, 491a5ed9182SOmar Sandoval struct btrfs_path *path, u64 offset) 492a5ed9182SOmar Sandoval { 493a5ed9182SOmar Sandoval struct extent_buffer *leaf; 494a5ed9182SOmar Sandoval struct btrfs_key key; 495a5ed9182SOmar Sandoval u64 found_start, found_end; 496a5ed9182SOmar Sandoval unsigned long ptr, i; 497a5ed9182SOmar Sandoval 498a5ed9182SOmar Sandoval leaf = path->nodes[0]; 499a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); 500a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_BITMAP_KEY); 501a5ed9182SOmar Sandoval 502a5ed9182SOmar Sandoval found_start = key.objectid; 503a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 504a5ed9182SOmar Sandoval ASSERT(offset >= found_start && offset < found_end); 505a5ed9182SOmar Sandoval 506a5ed9182SOmar Sandoval ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); 507da17066cSJeff Mahoney i = div_u64(offset - found_start, 508da17066cSJeff Mahoney block_group->fs_info->sectorsize); 509a5ed9182SOmar Sandoval return !!extent_buffer_test_bit(leaf, ptr, i); 510a5ed9182SOmar Sandoval } 511a5ed9182SOmar Sandoval 512a5ed9182SOmar Sandoval static void free_space_set_bits(struct btrfs_block_group_cache *block_group, 513a5ed9182SOmar Sandoval struct btrfs_path *path, u64 *start, u64 *size, 514a5ed9182SOmar Sandoval int bit) 515a5ed9182SOmar Sandoval { 5160b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = block_group->fs_info; 517a5ed9182SOmar Sandoval struct extent_buffer *leaf; 518a5ed9182SOmar Sandoval struct btrfs_key key; 519a5ed9182SOmar Sandoval u64 end = *start + *size; 520a5ed9182SOmar Sandoval u64 found_start, found_end; 521a5ed9182SOmar Sandoval unsigned long ptr, first, last; 522a5ed9182SOmar Sandoval 523a5ed9182SOmar Sandoval leaf = path->nodes[0]; 524a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); 525a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_BITMAP_KEY); 526a5ed9182SOmar Sandoval 527a5ed9182SOmar Sandoval found_start = key.objectid; 528a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 529a5ed9182SOmar Sandoval ASSERT(*start >= found_start && *start < found_end); 530a5ed9182SOmar Sandoval ASSERT(end > found_start); 531a5ed9182SOmar Sandoval 532a5ed9182SOmar Sandoval if (end > found_end) 533a5ed9182SOmar Sandoval end = found_end; 534a5ed9182SOmar Sandoval 535a5ed9182SOmar Sandoval ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); 5360b246afaSJeff Mahoney first = div_u64(*start - found_start, fs_info->sectorsize); 5370b246afaSJeff Mahoney last = div_u64(end - found_start, fs_info->sectorsize); 538a5ed9182SOmar Sandoval if (bit) 539a5ed9182SOmar Sandoval extent_buffer_bitmap_set(leaf, ptr, first, last - first); 540a5ed9182SOmar Sandoval else 541a5ed9182SOmar Sandoval extent_buffer_bitmap_clear(leaf, ptr, first, last - first); 542a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 543a5ed9182SOmar Sandoval 544a5ed9182SOmar Sandoval *size -= end - *start; 545a5ed9182SOmar Sandoval *start = end; 546a5ed9182SOmar Sandoval } 547a5ed9182SOmar Sandoval 548a5ed9182SOmar Sandoval /* 549a5ed9182SOmar Sandoval * We can't use btrfs_next_item() in modify_free_space_bitmap() because 550a5ed9182SOmar Sandoval * btrfs_next_leaf() doesn't get the path for writing. We can forgo the fancy 551a5ed9182SOmar Sandoval * tree walking in btrfs_next_leaf() anyways because we know exactly what we're 552a5ed9182SOmar Sandoval * looking for. 553a5ed9182SOmar Sandoval */ 554a5ed9182SOmar Sandoval static int free_space_next_bitmap(struct btrfs_trans_handle *trans, 555a5ed9182SOmar Sandoval struct btrfs_root *root, struct btrfs_path *p) 556a5ed9182SOmar Sandoval { 557a5ed9182SOmar Sandoval struct btrfs_key key; 558a5ed9182SOmar Sandoval 559a5ed9182SOmar Sandoval if (p->slots[0] + 1 < btrfs_header_nritems(p->nodes[0])) { 560a5ed9182SOmar Sandoval p->slots[0]++; 561a5ed9182SOmar Sandoval return 0; 562a5ed9182SOmar Sandoval } 563a5ed9182SOmar Sandoval 564a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(p->nodes[0], &key, p->slots[0]); 565a5ed9182SOmar Sandoval btrfs_release_path(p); 566a5ed9182SOmar Sandoval 567a5ed9182SOmar Sandoval key.objectid += key.offset; 568a5ed9182SOmar Sandoval key.type = (u8)-1; 569a5ed9182SOmar Sandoval key.offset = (u64)-1; 570a5ed9182SOmar Sandoval 571a5ed9182SOmar Sandoval return btrfs_search_prev_slot(trans, root, &key, p, 0, 1); 572a5ed9182SOmar Sandoval } 573a5ed9182SOmar Sandoval 574a5ed9182SOmar Sandoval /* 575a5ed9182SOmar Sandoval * If remove is 1, then we are removing free space, thus clearing bits in the 576a5ed9182SOmar Sandoval * bitmap. If remove is 0, then we are adding free space, thus setting bits in 577a5ed9182SOmar Sandoval * the bitmap. 578a5ed9182SOmar Sandoval */ 579a5ed9182SOmar Sandoval static int modify_free_space_bitmap(struct btrfs_trans_handle *trans, 580a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info, 581a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group, 582a5ed9182SOmar Sandoval struct btrfs_path *path, 583a5ed9182SOmar Sandoval u64 start, u64 size, int remove) 584a5ed9182SOmar Sandoval { 585a5ed9182SOmar Sandoval struct btrfs_root *root = fs_info->free_space_root; 586a5ed9182SOmar Sandoval struct btrfs_key key; 587a5ed9182SOmar Sandoval u64 end = start + size; 588a5ed9182SOmar Sandoval u64 cur_start, cur_size; 589a5ed9182SOmar Sandoval int prev_bit, next_bit; 590a5ed9182SOmar Sandoval int new_extents; 591a5ed9182SOmar Sandoval int ret; 592a5ed9182SOmar Sandoval 593a5ed9182SOmar Sandoval /* 594a5ed9182SOmar Sandoval * Read the bit for the block immediately before the extent of space if 595a5ed9182SOmar Sandoval * that block is within the block group. 596a5ed9182SOmar Sandoval */ 597a5ed9182SOmar Sandoval if (start > block_group->key.objectid) { 598da17066cSJeff Mahoney u64 prev_block = start - block_group->fs_info->sectorsize; 599a5ed9182SOmar Sandoval 600a5ed9182SOmar Sandoval key.objectid = prev_block; 601a5ed9182SOmar Sandoval key.type = (u8)-1; 602a5ed9182SOmar Sandoval key.offset = (u64)-1; 603a5ed9182SOmar Sandoval 604a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, 0, 1); 605a5ed9182SOmar Sandoval if (ret) 606a5ed9182SOmar Sandoval goto out; 607a5ed9182SOmar Sandoval 608a5ed9182SOmar Sandoval prev_bit = free_space_test_bit(block_group, path, prev_block); 609a5ed9182SOmar Sandoval 610a5ed9182SOmar Sandoval /* The previous block may have been in the previous bitmap. */ 611a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 612a5ed9182SOmar Sandoval if (start >= key.objectid + key.offset) { 613a5ed9182SOmar Sandoval ret = free_space_next_bitmap(trans, root, path); 614a5ed9182SOmar Sandoval if (ret) 615a5ed9182SOmar Sandoval goto out; 616a5ed9182SOmar Sandoval } 617a5ed9182SOmar Sandoval } else { 618a5ed9182SOmar Sandoval key.objectid = start; 619a5ed9182SOmar Sandoval key.type = (u8)-1; 620a5ed9182SOmar Sandoval key.offset = (u64)-1; 621a5ed9182SOmar Sandoval 622a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, 0, 1); 623a5ed9182SOmar Sandoval if (ret) 624a5ed9182SOmar Sandoval goto out; 625a5ed9182SOmar Sandoval 626a5ed9182SOmar Sandoval prev_bit = -1; 627a5ed9182SOmar Sandoval } 628a5ed9182SOmar Sandoval 629a5ed9182SOmar Sandoval /* 630a5ed9182SOmar Sandoval * Iterate over all of the bitmaps overlapped by the extent of space, 631a5ed9182SOmar Sandoval * clearing/setting bits as required. 632a5ed9182SOmar Sandoval */ 633a5ed9182SOmar Sandoval cur_start = start; 634a5ed9182SOmar Sandoval cur_size = size; 635a5ed9182SOmar Sandoval while (1) { 636a5ed9182SOmar Sandoval free_space_set_bits(block_group, path, &cur_start, &cur_size, 637a5ed9182SOmar Sandoval !remove); 638a5ed9182SOmar Sandoval if (cur_size == 0) 639a5ed9182SOmar Sandoval break; 640a5ed9182SOmar Sandoval ret = free_space_next_bitmap(trans, root, path); 641a5ed9182SOmar Sandoval if (ret) 642a5ed9182SOmar Sandoval goto out; 643a5ed9182SOmar Sandoval } 644a5ed9182SOmar Sandoval 645a5ed9182SOmar Sandoval /* 646a5ed9182SOmar Sandoval * Read the bit for the block immediately after the extent of space if 647a5ed9182SOmar Sandoval * that block is within the block group. 648a5ed9182SOmar Sandoval */ 649a5ed9182SOmar Sandoval if (end < block_group->key.objectid + block_group->key.offset) { 650a5ed9182SOmar Sandoval /* The next block may be in the next bitmap. */ 651a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 652a5ed9182SOmar Sandoval if (end >= key.objectid + key.offset) { 653a5ed9182SOmar Sandoval ret = free_space_next_bitmap(trans, root, path); 654a5ed9182SOmar Sandoval if (ret) 655a5ed9182SOmar Sandoval goto out; 656a5ed9182SOmar Sandoval } 657a5ed9182SOmar Sandoval 658a5ed9182SOmar Sandoval next_bit = free_space_test_bit(block_group, path, end); 659a5ed9182SOmar Sandoval } else { 660a5ed9182SOmar Sandoval next_bit = -1; 661a5ed9182SOmar Sandoval } 662a5ed9182SOmar Sandoval 663a5ed9182SOmar Sandoval if (remove) { 664a5ed9182SOmar Sandoval new_extents = -1; 665a5ed9182SOmar Sandoval if (prev_bit == 1) { 666a5ed9182SOmar Sandoval /* Leftover on the left. */ 667a5ed9182SOmar Sandoval new_extents++; 668a5ed9182SOmar Sandoval } 669a5ed9182SOmar Sandoval if (next_bit == 1) { 670a5ed9182SOmar Sandoval /* Leftover on the right. */ 671a5ed9182SOmar Sandoval new_extents++; 672a5ed9182SOmar Sandoval } 673a5ed9182SOmar Sandoval } else { 674a5ed9182SOmar Sandoval new_extents = 1; 675a5ed9182SOmar Sandoval if (prev_bit == 1) { 676a5ed9182SOmar Sandoval /* Merging with neighbor on the left. */ 677a5ed9182SOmar Sandoval new_extents--; 678a5ed9182SOmar Sandoval } 679a5ed9182SOmar Sandoval if (next_bit == 1) { 680a5ed9182SOmar Sandoval /* Merging with neighbor on the right. */ 681a5ed9182SOmar Sandoval new_extents--; 682a5ed9182SOmar Sandoval } 683a5ed9182SOmar Sandoval } 684a5ed9182SOmar Sandoval 685a5ed9182SOmar Sandoval btrfs_release_path(path); 686690d7682SNikolay Borisov ret = update_free_space_extent_count(trans, block_group, path, 687a5ed9182SOmar Sandoval new_extents); 688a5ed9182SOmar Sandoval 689a5ed9182SOmar Sandoval out: 690a5ed9182SOmar Sandoval return ret; 691a5ed9182SOmar Sandoval } 692a5ed9182SOmar Sandoval 693a5ed9182SOmar Sandoval static int remove_free_space_extent(struct btrfs_trans_handle *trans, 694a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info, 695a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group, 696a5ed9182SOmar Sandoval struct btrfs_path *path, 697a5ed9182SOmar Sandoval u64 start, u64 size) 698a5ed9182SOmar Sandoval { 699a5ed9182SOmar Sandoval struct btrfs_root *root = fs_info->free_space_root; 700a5ed9182SOmar Sandoval struct btrfs_key key; 701a5ed9182SOmar Sandoval u64 found_start, found_end; 702a5ed9182SOmar Sandoval u64 end = start + size; 703a5ed9182SOmar Sandoval int new_extents = -1; 704a5ed9182SOmar Sandoval int ret; 705a5ed9182SOmar Sandoval 706a5ed9182SOmar Sandoval key.objectid = start; 707a5ed9182SOmar Sandoval key.type = (u8)-1; 708a5ed9182SOmar Sandoval key.offset = (u64)-1; 709a5ed9182SOmar Sandoval 710a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 711a5ed9182SOmar Sandoval if (ret) 712a5ed9182SOmar Sandoval goto out; 713a5ed9182SOmar Sandoval 714a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 715a5ed9182SOmar Sandoval 716a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_EXTENT_KEY); 717a5ed9182SOmar Sandoval 718a5ed9182SOmar Sandoval found_start = key.objectid; 719a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 720a5ed9182SOmar Sandoval ASSERT(start >= found_start && end <= found_end); 721a5ed9182SOmar Sandoval 722a5ed9182SOmar Sandoval /* 723a5ed9182SOmar Sandoval * Okay, now that we've found the free space extent which contains the 724a5ed9182SOmar Sandoval * free space that we are removing, there are four cases: 725a5ed9182SOmar Sandoval * 726a5ed9182SOmar Sandoval * 1. We're using the whole extent: delete the key we found and 727a5ed9182SOmar Sandoval * decrement the free space extent count. 728a5ed9182SOmar Sandoval * 2. We are using part of the extent starting at the beginning: delete 729a5ed9182SOmar Sandoval * the key we found and insert a new key representing the leftover at 730a5ed9182SOmar Sandoval * the end. There is no net change in the number of extents. 731a5ed9182SOmar Sandoval * 3. We are using part of the extent ending at the end: delete the key 732a5ed9182SOmar Sandoval * we found and insert a new key representing the leftover at the 733a5ed9182SOmar Sandoval * beginning. There is no net change in the number of extents. 734a5ed9182SOmar Sandoval * 4. We are using part of the extent in the middle: delete the key we 735a5ed9182SOmar Sandoval * found and insert two new keys representing the leftovers on each 736a5ed9182SOmar Sandoval * side. Where we used to have one extent, we now have two, so increment 737a5ed9182SOmar Sandoval * the extent count. We may need to convert the block group to bitmaps 738a5ed9182SOmar Sandoval * as a result. 739a5ed9182SOmar Sandoval */ 740a5ed9182SOmar Sandoval 741a5ed9182SOmar Sandoval /* Delete the existing key (cases 1-4). */ 742a5ed9182SOmar Sandoval ret = btrfs_del_item(trans, root, path); 743a5ed9182SOmar Sandoval if (ret) 744a5ed9182SOmar Sandoval goto out; 745a5ed9182SOmar Sandoval 746a5ed9182SOmar Sandoval /* Add a key for leftovers at the beginning (cases 3 and 4). */ 747a5ed9182SOmar Sandoval if (start > found_start) { 748a5ed9182SOmar Sandoval key.objectid = found_start; 749a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_EXTENT_KEY; 750a5ed9182SOmar Sandoval key.offset = start - found_start; 751a5ed9182SOmar Sandoval 752a5ed9182SOmar Sandoval btrfs_release_path(path); 753a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, 0); 754a5ed9182SOmar Sandoval if (ret) 755a5ed9182SOmar Sandoval goto out; 756a5ed9182SOmar Sandoval new_extents++; 757a5ed9182SOmar Sandoval } 758a5ed9182SOmar Sandoval 759a5ed9182SOmar Sandoval /* Add a key for leftovers at the end (cases 2 and 4). */ 760a5ed9182SOmar Sandoval if (end < found_end) { 761a5ed9182SOmar Sandoval key.objectid = end; 762a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_EXTENT_KEY; 763a5ed9182SOmar Sandoval key.offset = found_end - end; 764a5ed9182SOmar Sandoval 765a5ed9182SOmar Sandoval btrfs_release_path(path); 766a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, 0); 767a5ed9182SOmar Sandoval if (ret) 768a5ed9182SOmar Sandoval goto out; 769a5ed9182SOmar Sandoval new_extents++; 770a5ed9182SOmar Sandoval } 771a5ed9182SOmar Sandoval 772a5ed9182SOmar Sandoval btrfs_release_path(path); 773690d7682SNikolay Borisov ret = update_free_space_extent_count(trans, block_group, path, 774a5ed9182SOmar Sandoval new_extents); 775a5ed9182SOmar Sandoval 776a5ed9182SOmar Sandoval out: 777a5ed9182SOmar Sandoval return ret; 778a5ed9182SOmar Sandoval } 779a5ed9182SOmar Sandoval 780a5ed9182SOmar Sandoval int __remove_from_free_space_tree(struct btrfs_trans_handle *trans, 781a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info, 782a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group, 783a5ed9182SOmar Sandoval struct btrfs_path *path, u64 start, u64 size) 784a5ed9182SOmar Sandoval { 785a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 786a5ed9182SOmar Sandoval u32 flags; 787a5ed9182SOmar Sandoval int ret; 788a5ed9182SOmar Sandoval 789a5ed9182SOmar Sandoval if (block_group->needs_free_space) { 7909a7e0f92SNikolay Borisov ret = __add_block_group_free_space(trans, block_group, path); 791a5ed9182SOmar Sandoval if (ret) 792a5ed9182SOmar Sandoval return ret; 793a5ed9182SOmar Sandoval } 794a5ed9182SOmar Sandoval 795a5ed9182SOmar Sandoval info = search_free_space_info(NULL, fs_info, block_group, path, 0); 796a5ed9182SOmar Sandoval if (IS_ERR(info)) 797a5ed9182SOmar Sandoval return PTR_ERR(info); 798a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(path->nodes[0], info); 799a5ed9182SOmar Sandoval btrfs_release_path(path); 800a5ed9182SOmar Sandoval 801a5ed9182SOmar Sandoval if (flags & BTRFS_FREE_SPACE_USING_BITMAPS) { 802a5ed9182SOmar Sandoval return modify_free_space_bitmap(trans, fs_info, block_group, 803a5ed9182SOmar Sandoval path, start, size, 1); 804a5ed9182SOmar Sandoval } else { 805a5ed9182SOmar Sandoval return remove_free_space_extent(trans, fs_info, block_group, 806a5ed9182SOmar Sandoval path, start, size); 807a5ed9182SOmar Sandoval } 808a5ed9182SOmar Sandoval } 809a5ed9182SOmar Sandoval 810a5ed9182SOmar Sandoval int remove_from_free_space_tree(struct btrfs_trans_handle *trans, 811a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info, 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 818a5ed9182SOmar Sandoval if (!btrfs_fs_compat_ro(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 827a5ed9182SOmar Sandoval block_group = btrfs_lookup_block_group(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); 835a5ed9182SOmar Sandoval ret = __remove_from_free_space_tree(trans, fs_info, block_group, path, 836a5ed9182SOmar Sandoval start, 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_fs_info *fs_info, 849a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group, 850a5ed9182SOmar Sandoval struct btrfs_path *path, 851a5ed9182SOmar Sandoval u64 start, u64 size) 852a5ed9182SOmar Sandoval { 853a5ed9182SOmar Sandoval struct btrfs_root *root = fs_info->free_space_root; 854a5ed9182SOmar Sandoval struct btrfs_key key, new_key; 855a5ed9182SOmar Sandoval u64 found_start, found_end; 856a5ed9182SOmar Sandoval u64 end = start + size; 857a5ed9182SOmar Sandoval int new_extents = 1; 858a5ed9182SOmar Sandoval int ret; 859a5ed9182SOmar Sandoval 860a5ed9182SOmar Sandoval /* 861a5ed9182SOmar Sandoval * We are adding a new extent of free space, but we need to merge 862a5ed9182SOmar Sandoval * extents. There are four cases here: 863a5ed9182SOmar Sandoval * 864a5ed9182SOmar Sandoval * 1. The new extent does not have any immediate neighbors to merge 865a5ed9182SOmar Sandoval * with: add the new key and increment the free space extent count. We 866a5ed9182SOmar Sandoval * may need to convert the block group to bitmaps as a result. 867a5ed9182SOmar Sandoval * 2. The new extent has an immediate neighbor before it: remove the 868a5ed9182SOmar Sandoval * previous key and insert a new key combining both of them. There is no 869a5ed9182SOmar Sandoval * net change in the number of extents. 870a5ed9182SOmar Sandoval * 3. The new extent has an immediate neighbor after it: remove the next 871a5ed9182SOmar Sandoval * key and insert a new key combining both of them. There is no net 872a5ed9182SOmar Sandoval * change in the number of extents. 873a5ed9182SOmar Sandoval * 4. The new extent has immediate neighbors on both sides: remove both 874a5ed9182SOmar Sandoval * of the keys and insert a new key combining all of them. Where we used 875a5ed9182SOmar Sandoval * to have two extents, we now have one, so decrement the extent count. 876a5ed9182SOmar Sandoval */ 877a5ed9182SOmar Sandoval 878a5ed9182SOmar Sandoval new_key.objectid = start; 879a5ed9182SOmar Sandoval new_key.type = BTRFS_FREE_SPACE_EXTENT_KEY; 880a5ed9182SOmar Sandoval new_key.offset = size; 881a5ed9182SOmar Sandoval 882a5ed9182SOmar Sandoval /* Search for a neighbor on the left. */ 883a5ed9182SOmar Sandoval if (start == block_group->key.objectid) 884a5ed9182SOmar Sandoval goto right; 885a5ed9182SOmar Sandoval key.objectid = start - 1; 886a5ed9182SOmar Sandoval key.type = (u8)-1; 887a5ed9182SOmar Sandoval key.offset = (u64)-1; 888a5ed9182SOmar Sandoval 889a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 890a5ed9182SOmar Sandoval if (ret) 891a5ed9182SOmar Sandoval goto out; 892a5ed9182SOmar Sandoval 893a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 894a5ed9182SOmar Sandoval 895a5ed9182SOmar Sandoval if (key.type != BTRFS_FREE_SPACE_EXTENT_KEY) { 896a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_INFO_KEY); 897a5ed9182SOmar Sandoval btrfs_release_path(path); 898a5ed9182SOmar Sandoval goto right; 899a5ed9182SOmar Sandoval } 900a5ed9182SOmar Sandoval 901a5ed9182SOmar Sandoval found_start = key.objectid; 902a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 903a5ed9182SOmar Sandoval ASSERT(found_start >= block_group->key.objectid && 904a5ed9182SOmar Sandoval found_end > block_group->key.objectid); 905a5ed9182SOmar Sandoval ASSERT(found_start < start && found_end <= start); 906a5ed9182SOmar Sandoval 907a5ed9182SOmar Sandoval /* 908a5ed9182SOmar Sandoval * Delete the neighbor on the left and absorb it into the new key (cases 909a5ed9182SOmar Sandoval * 2 and 4). 910a5ed9182SOmar Sandoval */ 911a5ed9182SOmar Sandoval if (found_end == start) { 912a5ed9182SOmar Sandoval ret = btrfs_del_item(trans, root, path); 913a5ed9182SOmar Sandoval if (ret) 914a5ed9182SOmar Sandoval goto out; 915a5ed9182SOmar Sandoval new_key.objectid = found_start; 916a5ed9182SOmar Sandoval new_key.offset += key.offset; 917a5ed9182SOmar Sandoval new_extents--; 918a5ed9182SOmar Sandoval } 919a5ed9182SOmar Sandoval btrfs_release_path(path); 920a5ed9182SOmar Sandoval 921a5ed9182SOmar Sandoval right: 922a5ed9182SOmar Sandoval /* Search for a neighbor on the right. */ 923a5ed9182SOmar Sandoval if (end == block_group->key.objectid + block_group->key.offset) 924a5ed9182SOmar Sandoval goto insert; 925a5ed9182SOmar Sandoval key.objectid = end; 926a5ed9182SOmar Sandoval key.type = (u8)-1; 927a5ed9182SOmar Sandoval key.offset = (u64)-1; 928a5ed9182SOmar Sandoval 929a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 930a5ed9182SOmar Sandoval if (ret) 931a5ed9182SOmar Sandoval goto out; 932a5ed9182SOmar Sandoval 933a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 934a5ed9182SOmar Sandoval 935a5ed9182SOmar Sandoval if (key.type != BTRFS_FREE_SPACE_EXTENT_KEY) { 936a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_INFO_KEY); 937a5ed9182SOmar Sandoval btrfs_release_path(path); 938a5ed9182SOmar Sandoval goto insert; 939a5ed9182SOmar Sandoval } 940a5ed9182SOmar Sandoval 941a5ed9182SOmar Sandoval found_start = key.objectid; 942a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 943a5ed9182SOmar Sandoval ASSERT(found_start >= block_group->key.objectid && 944a5ed9182SOmar Sandoval found_end > block_group->key.objectid); 945a5ed9182SOmar Sandoval ASSERT((found_start < start && found_end <= start) || 946a5ed9182SOmar Sandoval (found_start >= end && found_end > end)); 947a5ed9182SOmar Sandoval 948a5ed9182SOmar Sandoval /* 949a5ed9182SOmar Sandoval * Delete the neighbor on the right and absorb it into the new key 950a5ed9182SOmar Sandoval * (cases 3 and 4). 951a5ed9182SOmar Sandoval */ 952a5ed9182SOmar Sandoval if (found_start == end) { 953a5ed9182SOmar Sandoval ret = btrfs_del_item(trans, root, path); 954a5ed9182SOmar Sandoval if (ret) 955a5ed9182SOmar Sandoval goto out; 956a5ed9182SOmar Sandoval new_key.offset += key.offset; 957a5ed9182SOmar Sandoval new_extents--; 958a5ed9182SOmar Sandoval } 959a5ed9182SOmar Sandoval btrfs_release_path(path); 960a5ed9182SOmar Sandoval 961a5ed9182SOmar Sandoval insert: 962a5ed9182SOmar Sandoval /* Insert the new key (cases 1-4). */ 963a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &new_key, 0); 964a5ed9182SOmar Sandoval if (ret) 965a5ed9182SOmar Sandoval goto out; 966a5ed9182SOmar Sandoval 967a5ed9182SOmar Sandoval btrfs_release_path(path); 968690d7682SNikolay Borisov ret = update_free_space_extent_count(trans, block_group, path, 969a5ed9182SOmar Sandoval new_extents); 970a5ed9182SOmar Sandoval 971a5ed9182SOmar Sandoval out: 972a5ed9182SOmar Sandoval return ret; 973a5ed9182SOmar Sandoval } 974a5ed9182SOmar Sandoval 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 { 9792d5cffa1SNikolay Borisov struct btrfs_fs_info *fs_info = trans->fs_info; 980a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 981a5ed9182SOmar Sandoval u32 flags; 982a5ed9182SOmar Sandoval int ret; 983a5ed9182SOmar Sandoval 984a5ed9182SOmar Sandoval if (block_group->needs_free_space) { 9859a7e0f92SNikolay Borisov ret = __add_block_group_free_space(trans, block_group, path); 986a5ed9182SOmar Sandoval if (ret) 987a5ed9182SOmar Sandoval return ret; 988a5ed9182SOmar Sandoval } 989a5ed9182SOmar Sandoval 990a5ed9182SOmar Sandoval info = search_free_space_info(NULL, fs_info, block_group, path, 0); 991a5ed9182SOmar Sandoval if (IS_ERR(info)) 992a5ed9182SOmar Sandoval return PTR_ERR(info); 993a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(path->nodes[0], info); 994a5ed9182SOmar Sandoval btrfs_release_path(path); 995a5ed9182SOmar Sandoval 996a5ed9182SOmar Sandoval if (flags & BTRFS_FREE_SPACE_USING_BITMAPS) { 997a5ed9182SOmar Sandoval return modify_free_space_bitmap(trans, fs_info, block_group, 998a5ed9182SOmar Sandoval path, start, size, 0); 999a5ed9182SOmar Sandoval } else { 1000a5ed9182SOmar Sandoval return add_free_space_extent(trans, fs_info, block_group, path, 1001a5ed9182SOmar Sandoval start, size); 1002a5ed9182SOmar Sandoval } 1003a5ed9182SOmar Sandoval } 1004a5ed9182SOmar Sandoval 1005a5ed9182SOmar Sandoval int add_to_free_space_tree(struct btrfs_trans_handle *trans, 1006a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info, 1007a5ed9182SOmar Sandoval u64 start, u64 size) 1008a5ed9182SOmar Sandoval { 1009a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group; 1010a5ed9182SOmar Sandoval struct btrfs_path *path; 1011a5ed9182SOmar Sandoval int ret; 1012a5ed9182SOmar Sandoval 1013a5ed9182SOmar Sandoval if (!btrfs_fs_compat_ro(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 1022a5ed9182SOmar Sandoval block_group = btrfs_lookup_block_group(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, 1047a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info, 1048a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group) 1049a5ed9182SOmar Sandoval { 1050a5ed9182SOmar Sandoval struct btrfs_root *extent_root = fs_info->extent_root; 1051a5ed9182SOmar Sandoval struct btrfs_path *path, *path2; 1052a5ed9182SOmar Sandoval struct btrfs_key key; 1053a5ed9182SOmar Sandoval u64 start, end; 1054a5ed9182SOmar Sandoval int ret; 1055a5ed9182SOmar Sandoval 1056a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1057a5ed9182SOmar Sandoval if (!path) 1058a5ed9182SOmar Sandoval return -ENOMEM; 1059019599adSGu Jinxiang path->reada = READA_FORWARD; 1060a5ed9182SOmar Sandoval 1061a5ed9182SOmar Sandoval path2 = btrfs_alloc_path(); 1062a5ed9182SOmar Sandoval if (!path2) { 1063a5ed9182SOmar Sandoval btrfs_free_path(path); 1064a5ed9182SOmar Sandoval return -ENOMEM; 1065a5ed9182SOmar Sandoval } 1066a5ed9182SOmar Sandoval 106766afee18SNikolay Borisov ret = add_new_free_space_info(trans, block_group, path2); 1068a5ed9182SOmar Sandoval if (ret) 1069a5ed9182SOmar Sandoval goto out; 1070a5ed9182SOmar Sandoval 1071511711afSChris Mason mutex_lock(&block_group->free_space_lock); 1072511711afSChris Mason 1073a5ed9182SOmar Sandoval /* 1074a5ed9182SOmar Sandoval * Iterate through all of the extent and metadata items in this block 1075a5ed9182SOmar Sandoval * group, adding the free space between them and the free space at the 1076a5ed9182SOmar Sandoval * end. Note that EXTENT_ITEM and METADATA_ITEM are less than 1077a5ed9182SOmar Sandoval * BLOCK_GROUP_ITEM, so an extent may precede the block group that it's 1078a5ed9182SOmar Sandoval * contained in. 1079a5ed9182SOmar Sandoval */ 1080a5ed9182SOmar Sandoval key.objectid = block_group->key.objectid; 1081a5ed9182SOmar Sandoval key.type = BTRFS_EXTENT_ITEM_KEY; 1082a5ed9182SOmar Sandoval key.offset = 0; 1083a5ed9182SOmar Sandoval 1084a5ed9182SOmar Sandoval ret = btrfs_search_slot_for_read(extent_root, &key, path, 1, 0); 1085a5ed9182SOmar Sandoval if (ret < 0) 1086511711afSChris Mason goto out_locked; 1087a5ed9182SOmar Sandoval ASSERT(ret == 0); 1088a5ed9182SOmar Sandoval 1089a5ed9182SOmar Sandoval start = block_group->key.objectid; 1090a5ed9182SOmar Sandoval end = block_group->key.objectid + block_group->key.offset; 1091a5ed9182SOmar Sandoval while (1) { 1092a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 1093a5ed9182SOmar Sandoval 1094a5ed9182SOmar Sandoval if (key.type == BTRFS_EXTENT_ITEM_KEY || 1095a5ed9182SOmar Sandoval key.type == BTRFS_METADATA_ITEM_KEY) { 1096a5ed9182SOmar Sandoval if (key.objectid >= end) 1097a5ed9182SOmar Sandoval break; 1098a5ed9182SOmar Sandoval 1099a5ed9182SOmar Sandoval if (start < key.objectid) { 11002d5cffa1SNikolay Borisov ret = __add_to_free_space_tree(trans, 1101a5ed9182SOmar Sandoval block_group, 1102a5ed9182SOmar Sandoval path2, start, 1103a5ed9182SOmar Sandoval key.objectid - 1104a5ed9182SOmar Sandoval start); 1105a5ed9182SOmar Sandoval if (ret) 1106511711afSChris Mason goto out_locked; 1107a5ed9182SOmar Sandoval } 1108a5ed9182SOmar Sandoval start = key.objectid; 1109a5ed9182SOmar Sandoval if (key.type == BTRFS_METADATA_ITEM_KEY) 1110da17066cSJeff Mahoney start += fs_info->nodesize; 1111a5ed9182SOmar Sandoval else 1112a5ed9182SOmar Sandoval start += key.offset; 1113a5ed9182SOmar Sandoval } else if (key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { 1114a5ed9182SOmar Sandoval if (key.objectid != block_group->key.objectid) 1115a5ed9182SOmar Sandoval break; 1116a5ed9182SOmar Sandoval } 1117a5ed9182SOmar Sandoval 1118a5ed9182SOmar Sandoval ret = btrfs_next_item(extent_root, path); 1119a5ed9182SOmar Sandoval if (ret < 0) 1120511711afSChris Mason goto out_locked; 1121a5ed9182SOmar Sandoval if (ret) 1122a5ed9182SOmar Sandoval break; 1123a5ed9182SOmar Sandoval } 1124a5ed9182SOmar Sandoval if (start < end) { 11252d5cffa1SNikolay Borisov ret = __add_to_free_space_tree(trans, block_group, path2, 11262d5cffa1SNikolay Borisov start, end - start); 1127a5ed9182SOmar Sandoval if (ret) 1128511711afSChris Mason goto out_locked; 1129a5ed9182SOmar Sandoval } 1130a5ed9182SOmar Sandoval 1131a5ed9182SOmar Sandoval ret = 0; 1132511711afSChris Mason out_locked: 1133511711afSChris Mason mutex_unlock(&block_group->free_space_lock); 1134a5ed9182SOmar Sandoval out: 1135a5ed9182SOmar Sandoval btrfs_free_path(path2); 1136a5ed9182SOmar Sandoval btrfs_free_path(path); 1137a5ed9182SOmar Sandoval return ret; 1138a5ed9182SOmar Sandoval } 1139a5ed9182SOmar Sandoval 1140a5ed9182SOmar Sandoval int btrfs_create_free_space_tree(struct btrfs_fs_info *fs_info) 1141a5ed9182SOmar Sandoval { 1142a5ed9182SOmar Sandoval struct btrfs_trans_handle *trans; 1143a5ed9182SOmar Sandoval struct btrfs_root *tree_root = fs_info->tree_root; 1144a5ed9182SOmar Sandoval struct btrfs_root *free_space_root; 1145a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group; 1146a5ed9182SOmar Sandoval struct rb_node *node; 1147a5ed9182SOmar Sandoval int ret; 1148a5ed9182SOmar Sandoval 1149a5ed9182SOmar Sandoval trans = btrfs_start_transaction(tree_root, 0); 1150a5ed9182SOmar Sandoval if (IS_ERR(trans)) 1151a5ed9182SOmar Sandoval return PTR_ERR(trans); 1152a5ed9182SOmar Sandoval 1153afcdd129SJosef Bacik set_bit(BTRFS_FS_CREATING_FREE_SPACE_TREE, &fs_info->flags); 1154a5ed9182SOmar Sandoval free_space_root = btrfs_create_tree(trans, fs_info, 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) { 1164a5ed9182SOmar Sandoval block_group = rb_entry(node, struct btrfs_block_group_cache, 1165a5ed9182SOmar Sandoval cache_node); 1166a5ed9182SOmar Sandoval ret = populate_free_space_tree(trans, fs_info, 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); 1175a5ed9182SOmar Sandoval 11760bef7109SSahil Kang return btrfs_commit_transaction(trans); 1177a5ed9182SOmar Sandoval 1178a5ed9182SOmar Sandoval abort: 1179afcdd129SJosef Bacik clear_bit(BTRFS_FS_CREATING_FREE_SPACE_TREE, &fs_info->flags); 118066642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 11813a45bb20SJeff Mahoney btrfs_end_transaction(trans); 1182a5ed9182SOmar Sandoval return ret; 1183a5ed9182SOmar Sandoval } 1184a5ed9182SOmar Sandoval 1185a5ed9182SOmar Sandoval static int clear_free_space_tree(struct btrfs_trans_handle *trans, 1186a5ed9182SOmar Sandoval struct btrfs_root *root) 1187a5ed9182SOmar Sandoval { 1188a5ed9182SOmar Sandoval struct btrfs_path *path; 1189a5ed9182SOmar Sandoval struct btrfs_key key; 1190a5ed9182SOmar Sandoval int nr; 1191a5ed9182SOmar Sandoval int ret; 1192a5ed9182SOmar Sandoval 1193a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1194a5ed9182SOmar Sandoval if (!path) 1195a5ed9182SOmar Sandoval return -ENOMEM; 1196a5ed9182SOmar Sandoval 1197a5ed9182SOmar Sandoval path->leave_spinning = 1; 1198a5ed9182SOmar Sandoval 1199a5ed9182SOmar Sandoval key.objectid = 0; 1200a5ed9182SOmar Sandoval key.type = 0; 1201a5ed9182SOmar Sandoval key.offset = 0; 1202a5ed9182SOmar Sandoval 1203a5ed9182SOmar Sandoval while (1) { 1204a5ed9182SOmar Sandoval ret = btrfs_search_slot(trans, root, &key, path, -1, 1); 1205a5ed9182SOmar Sandoval if (ret < 0) 1206a5ed9182SOmar Sandoval goto out; 1207a5ed9182SOmar Sandoval 1208a5ed9182SOmar Sandoval nr = btrfs_header_nritems(path->nodes[0]); 1209a5ed9182SOmar Sandoval if (!nr) 1210a5ed9182SOmar Sandoval break; 1211a5ed9182SOmar Sandoval 1212a5ed9182SOmar Sandoval path->slots[0] = 0; 1213a5ed9182SOmar Sandoval ret = btrfs_del_items(trans, root, path, 0, nr); 1214a5ed9182SOmar Sandoval if (ret) 1215a5ed9182SOmar Sandoval goto out; 1216a5ed9182SOmar Sandoval 1217a5ed9182SOmar Sandoval btrfs_release_path(path); 1218a5ed9182SOmar Sandoval } 1219a5ed9182SOmar Sandoval 1220a5ed9182SOmar Sandoval ret = 0; 1221a5ed9182SOmar Sandoval out: 1222a5ed9182SOmar Sandoval btrfs_free_path(path); 1223a5ed9182SOmar Sandoval return ret; 1224a5ed9182SOmar Sandoval } 1225a5ed9182SOmar Sandoval 1226a5ed9182SOmar Sandoval int btrfs_clear_free_space_tree(struct btrfs_fs_info *fs_info) 1227a5ed9182SOmar Sandoval { 1228a5ed9182SOmar Sandoval struct btrfs_trans_handle *trans; 1229a5ed9182SOmar Sandoval struct btrfs_root *tree_root = fs_info->tree_root; 1230a5ed9182SOmar Sandoval struct btrfs_root *free_space_root = fs_info->free_space_root; 1231a5ed9182SOmar Sandoval int ret; 1232a5ed9182SOmar Sandoval 1233a5ed9182SOmar Sandoval trans = btrfs_start_transaction(tree_root, 0); 1234a5ed9182SOmar Sandoval if (IS_ERR(trans)) 1235a5ed9182SOmar Sandoval return PTR_ERR(trans); 1236a5ed9182SOmar Sandoval 1237a5ed9182SOmar Sandoval btrfs_clear_fs_compat_ro(fs_info, FREE_SPACE_TREE); 12386675df31SOmar Sandoval btrfs_clear_fs_compat_ro(fs_info, FREE_SPACE_TREE_VALID); 1239a5ed9182SOmar Sandoval fs_info->free_space_root = NULL; 1240a5ed9182SOmar Sandoval 1241a5ed9182SOmar Sandoval ret = clear_free_space_tree(trans, free_space_root); 1242a5ed9182SOmar Sandoval if (ret) 1243a5ed9182SOmar Sandoval goto abort; 1244a5ed9182SOmar Sandoval 12451cd5447eSJeff Mahoney ret = btrfs_del_root(trans, fs_info, &free_space_root->root_key); 1246a5ed9182SOmar Sandoval if (ret) 1247a5ed9182SOmar Sandoval goto abort; 1248a5ed9182SOmar Sandoval 1249a5ed9182SOmar Sandoval list_del(&free_space_root->dirty_list); 1250a5ed9182SOmar Sandoval 1251a5ed9182SOmar Sandoval btrfs_tree_lock(free_space_root->node); 12527c302b49SDavid Sterba clean_tree_block(fs_info, free_space_root->node); 1253a5ed9182SOmar Sandoval btrfs_tree_unlock(free_space_root->node); 1254a5ed9182SOmar Sandoval btrfs_free_tree_block(trans, free_space_root, free_space_root->node, 1255a5ed9182SOmar Sandoval 0, 1); 1256a5ed9182SOmar Sandoval 1257a5ed9182SOmar Sandoval free_extent_buffer(free_space_root->node); 1258a5ed9182SOmar Sandoval free_extent_buffer(free_space_root->commit_root); 1259a5ed9182SOmar Sandoval kfree(free_space_root); 1260a5ed9182SOmar Sandoval 12610bef7109SSahil Kang return btrfs_commit_transaction(trans); 1262a5ed9182SOmar Sandoval 1263a5ed9182SOmar Sandoval abort: 126466642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 12653a45bb20SJeff Mahoney btrfs_end_transaction(trans); 1266a5ed9182SOmar Sandoval return ret; 1267a5ed9182SOmar Sandoval } 1268a5ed9182SOmar Sandoval 1269a5ed9182SOmar Sandoval static int __add_block_group_free_space(struct btrfs_trans_handle *trans, 1270a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group, 1271a5ed9182SOmar Sandoval struct btrfs_path *path) 1272a5ed9182SOmar Sandoval { 1273a5ed9182SOmar Sandoval int ret; 1274a5ed9182SOmar Sandoval 1275a5ed9182SOmar Sandoval block_group->needs_free_space = 0; 1276a5ed9182SOmar Sandoval 127766afee18SNikolay Borisov ret = add_new_free_space_info(trans, block_group, path); 1278a5ed9182SOmar Sandoval if (ret) 1279a5ed9182SOmar Sandoval return ret; 1280a5ed9182SOmar Sandoval 12812d5cffa1SNikolay Borisov return __add_to_free_space_tree(trans, block_group, path, 1282a5ed9182SOmar Sandoval block_group->key.objectid, 1283a5ed9182SOmar Sandoval block_group->key.offset); 1284a5ed9182SOmar Sandoval } 1285a5ed9182SOmar Sandoval 1286a5ed9182SOmar Sandoval int add_block_group_free_space(struct btrfs_trans_handle *trans, 1287a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group) 1288a5ed9182SOmar Sandoval { 1289e4e0711cSNikolay Borisov struct btrfs_fs_info *fs_info = trans->fs_info; 1290a5ed9182SOmar Sandoval struct btrfs_path *path = NULL; 1291a5ed9182SOmar Sandoval int ret = 0; 1292a5ed9182SOmar Sandoval 1293a5ed9182SOmar Sandoval if (!btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) 1294a5ed9182SOmar Sandoval return 0; 1295a5ed9182SOmar Sandoval 1296a5ed9182SOmar Sandoval mutex_lock(&block_group->free_space_lock); 1297a5ed9182SOmar Sandoval if (!block_group->needs_free_space) 1298a5ed9182SOmar Sandoval goto out; 1299a5ed9182SOmar Sandoval 1300a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1301a5ed9182SOmar Sandoval if (!path) { 1302a5ed9182SOmar Sandoval ret = -ENOMEM; 1303a5ed9182SOmar Sandoval goto out; 1304a5ed9182SOmar Sandoval } 1305a5ed9182SOmar Sandoval 13069a7e0f92SNikolay Borisov ret = __add_block_group_free_space(trans, block_group, path); 1307a5ed9182SOmar Sandoval 1308a5ed9182SOmar Sandoval out: 1309a5ed9182SOmar Sandoval btrfs_free_path(path); 1310a5ed9182SOmar Sandoval mutex_unlock(&block_group->free_space_lock); 1311a5ed9182SOmar Sandoval if (ret) 131266642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 1313a5ed9182SOmar Sandoval return ret; 1314a5ed9182SOmar Sandoval } 1315a5ed9182SOmar Sandoval 1316a5ed9182SOmar Sandoval int remove_block_group_free_space(struct btrfs_trans_handle *trans, 1317a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group) 1318a5ed9182SOmar Sandoval { 1319f3f72779SNikolay Borisov struct btrfs_root *root = trans->fs_info->free_space_root; 1320a5ed9182SOmar Sandoval struct btrfs_path *path; 1321a5ed9182SOmar Sandoval struct btrfs_key key, found_key; 1322a5ed9182SOmar Sandoval struct extent_buffer *leaf; 1323a5ed9182SOmar Sandoval u64 start, end; 1324a5ed9182SOmar Sandoval int done = 0, nr; 1325a5ed9182SOmar Sandoval int ret; 1326a5ed9182SOmar Sandoval 1327f3f72779SNikolay Borisov if (!btrfs_fs_compat_ro(trans->fs_info, FREE_SPACE_TREE)) 1328a5ed9182SOmar Sandoval return 0; 1329a5ed9182SOmar Sandoval 1330a5ed9182SOmar Sandoval if (block_group->needs_free_space) { 1331a5ed9182SOmar Sandoval /* We never added this block group to the free space tree. */ 1332a5ed9182SOmar Sandoval return 0; 1333a5ed9182SOmar Sandoval } 1334a5ed9182SOmar Sandoval 1335a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1336a5ed9182SOmar Sandoval if (!path) { 1337a5ed9182SOmar Sandoval ret = -ENOMEM; 1338a5ed9182SOmar Sandoval goto out; 1339a5ed9182SOmar Sandoval } 1340a5ed9182SOmar Sandoval 1341a5ed9182SOmar Sandoval start = block_group->key.objectid; 1342a5ed9182SOmar Sandoval end = block_group->key.objectid + block_group->key.offset; 1343a5ed9182SOmar Sandoval 1344a5ed9182SOmar Sandoval key.objectid = end - 1; 1345a5ed9182SOmar Sandoval key.type = (u8)-1; 1346a5ed9182SOmar Sandoval key.offset = (u64)-1; 1347a5ed9182SOmar Sandoval 1348a5ed9182SOmar Sandoval while (!done) { 1349a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 1350a5ed9182SOmar Sandoval if (ret) 1351a5ed9182SOmar Sandoval goto out; 1352a5ed9182SOmar Sandoval 1353a5ed9182SOmar Sandoval leaf = path->nodes[0]; 1354a5ed9182SOmar Sandoval nr = 0; 1355a5ed9182SOmar Sandoval path->slots[0]++; 1356a5ed9182SOmar Sandoval while (path->slots[0] > 0) { 1357a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0] - 1); 1358a5ed9182SOmar Sandoval 1359a5ed9182SOmar Sandoval if (found_key.type == BTRFS_FREE_SPACE_INFO_KEY) { 1360a5ed9182SOmar Sandoval ASSERT(found_key.objectid == block_group->key.objectid); 1361a5ed9182SOmar Sandoval ASSERT(found_key.offset == block_group->key.offset); 1362a5ed9182SOmar Sandoval done = 1; 1363a5ed9182SOmar Sandoval nr++; 1364a5ed9182SOmar Sandoval path->slots[0]--; 1365a5ed9182SOmar Sandoval break; 1366a5ed9182SOmar Sandoval } else if (found_key.type == BTRFS_FREE_SPACE_EXTENT_KEY || 1367a5ed9182SOmar Sandoval found_key.type == BTRFS_FREE_SPACE_BITMAP_KEY) { 1368a5ed9182SOmar Sandoval ASSERT(found_key.objectid >= start); 1369a5ed9182SOmar Sandoval ASSERT(found_key.objectid < end); 1370a5ed9182SOmar Sandoval ASSERT(found_key.objectid + found_key.offset <= end); 1371a5ed9182SOmar Sandoval nr++; 1372a5ed9182SOmar Sandoval path->slots[0]--; 1373a5ed9182SOmar Sandoval } else { 1374a5ed9182SOmar Sandoval ASSERT(0); 1375a5ed9182SOmar Sandoval } 1376a5ed9182SOmar Sandoval } 1377a5ed9182SOmar Sandoval 1378a5ed9182SOmar Sandoval ret = btrfs_del_items(trans, root, path, path->slots[0], nr); 1379a5ed9182SOmar Sandoval if (ret) 1380a5ed9182SOmar Sandoval goto out; 1381a5ed9182SOmar Sandoval btrfs_release_path(path); 1382a5ed9182SOmar Sandoval } 1383a5ed9182SOmar Sandoval 1384a5ed9182SOmar Sandoval ret = 0; 1385a5ed9182SOmar Sandoval out: 1386a5ed9182SOmar Sandoval btrfs_free_path(path); 1387a5ed9182SOmar Sandoval if (ret) 138866642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 1389a5ed9182SOmar Sandoval return ret; 1390a5ed9182SOmar Sandoval } 1391a5ed9182SOmar Sandoval 1392a5ed9182SOmar Sandoval static int load_free_space_bitmaps(struct btrfs_caching_control *caching_ctl, 1393a5ed9182SOmar Sandoval struct btrfs_path *path, 1394a5ed9182SOmar Sandoval u32 expected_extent_count) 1395a5ed9182SOmar Sandoval { 1396a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group; 1397a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info; 1398a5ed9182SOmar Sandoval struct btrfs_root *root; 1399a5ed9182SOmar Sandoval struct btrfs_key key; 1400a5ed9182SOmar Sandoval int prev_bit = 0, bit; 1401a5ed9182SOmar Sandoval /* Initialize to silence GCC. */ 1402a5ed9182SOmar Sandoval u64 extent_start = 0; 1403a5ed9182SOmar Sandoval u64 end, offset; 1404a5ed9182SOmar Sandoval u64 total_found = 0; 1405a5ed9182SOmar Sandoval u32 extent_count = 0; 1406a5ed9182SOmar Sandoval int ret; 1407a5ed9182SOmar Sandoval 1408a5ed9182SOmar Sandoval block_group = caching_ctl->block_group; 1409a5ed9182SOmar Sandoval fs_info = block_group->fs_info; 1410a5ed9182SOmar Sandoval root = fs_info->free_space_root; 1411a5ed9182SOmar Sandoval 1412a5ed9182SOmar Sandoval end = block_group->key.objectid + block_group->key.offset; 1413a5ed9182SOmar Sandoval 1414a5ed9182SOmar Sandoval while (1) { 1415a5ed9182SOmar Sandoval ret = btrfs_next_item(root, path); 1416a5ed9182SOmar Sandoval if (ret < 0) 1417a5ed9182SOmar Sandoval goto out; 1418a5ed9182SOmar Sandoval if (ret) 1419a5ed9182SOmar Sandoval break; 1420a5ed9182SOmar Sandoval 1421a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 1422a5ed9182SOmar Sandoval 1423a5ed9182SOmar Sandoval if (key.type == BTRFS_FREE_SPACE_INFO_KEY) 1424a5ed9182SOmar Sandoval break; 1425a5ed9182SOmar Sandoval 1426a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_BITMAP_KEY); 1427a5ed9182SOmar Sandoval ASSERT(key.objectid < end && key.objectid + key.offset <= end); 1428a5ed9182SOmar Sandoval 1429a5ed9182SOmar Sandoval caching_ctl->progress = key.objectid; 1430a5ed9182SOmar Sandoval 1431a5ed9182SOmar Sandoval offset = key.objectid; 1432a5ed9182SOmar Sandoval while (offset < key.objectid + key.offset) { 1433a5ed9182SOmar Sandoval bit = free_space_test_bit(block_group, path, offset); 1434a5ed9182SOmar Sandoval if (prev_bit == 0 && bit == 1) { 1435a5ed9182SOmar Sandoval extent_start = offset; 1436a5ed9182SOmar Sandoval } else if (prev_bit == 1 && bit == 0) { 1437a5ed9182SOmar Sandoval total_found += add_new_free_space(block_group, 1438a5ed9182SOmar Sandoval extent_start, 1439a5ed9182SOmar Sandoval offset); 1440a5ed9182SOmar Sandoval if (total_found > CACHING_CTL_WAKE_UP) { 1441a5ed9182SOmar Sandoval total_found = 0; 1442a5ed9182SOmar Sandoval wake_up(&caching_ctl->wait); 1443a5ed9182SOmar Sandoval } 1444a5ed9182SOmar Sandoval extent_count++; 1445a5ed9182SOmar Sandoval } 1446a5ed9182SOmar Sandoval prev_bit = bit; 14470b246afaSJeff Mahoney offset += fs_info->sectorsize; 1448a5ed9182SOmar Sandoval } 1449a5ed9182SOmar Sandoval } 1450a5ed9182SOmar Sandoval if (prev_bit == 1) { 14514457c1c7SNikolay Borisov total_found += add_new_free_space(block_group, extent_start, 14524457c1c7SNikolay Borisov end); 1453a5ed9182SOmar Sandoval extent_count++; 1454a5ed9182SOmar Sandoval } 1455a5ed9182SOmar Sandoval 1456a5ed9182SOmar Sandoval if (extent_count != expected_extent_count) { 14575d163e0eSJeff Mahoney btrfs_err(fs_info, 14585d163e0eSJeff Mahoney "incorrect extent count for %llu; counted %u, expected %u", 1459a5ed9182SOmar Sandoval block_group->key.objectid, extent_count, 1460a5ed9182SOmar Sandoval expected_extent_count); 1461a5ed9182SOmar Sandoval ASSERT(0); 1462a5ed9182SOmar Sandoval ret = -EIO; 1463a5ed9182SOmar Sandoval goto out; 1464a5ed9182SOmar Sandoval } 1465a5ed9182SOmar Sandoval 1466a5ed9182SOmar Sandoval caching_ctl->progress = (u64)-1; 1467a5ed9182SOmar Sandoval 1468a5ed9182SOmar Sandoval ret = 0; 1469a5ed9182SOmar Sandoval out: 1470a5ed9182SOmar Sandoval return ret; 1471a5ed9182SOmar Sandoval } 1472a5ed9182SOmar Sandoval 1473a5ed9182SOmar Sandoval static int load_free_space_extents(struct btrfs_caching_control *caching_ctl, 1474a5ed9182SOmar Sandoval struct btrfs_path *path, 1475a5ed9182SOmar Sandoval u32 expected_extent_count) 1476a5ed9182SOmar Sandoval { 1477a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group; 1478a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info; 1479a5ed9182SOmar Sandoval struct btrfs_root *root; 1480a5ed9182SOmar Sandoval struct btrfs_key key; 1481a5ed9182SOmar Sandoval u64 end; 1482a5ed9182SOmar Sandoval u64 total_found = 0; 1483a5ed9182SOmar Sandoval u32 extent_count = 0; 1484a5ed9182SOmar Sandoval int ret; 1485a5ed9182SOmar Sandoval 1486a5ed9182SOmar Sandoval block_group = caching_ctl->block_group; 1487a5ed9182SOmar Sandoval fs_info = block_group->fs_info; 1488a5ed9182SOmar Sandoval root = fs_info->free_space_root; 1489a5ed9182SOmar Sandoval 1490a5ed9182SOmar Sandoval end = block_group->key.objectid + block_group->key.offset; 1491a5ed9182SOmar Sandoval 1492a5ed9182SOmar Sandoval while (1) { 1493a5ed9182SOmar Sandoval ret = btrfs_next_item(root, path); 1494a5ed9182SOmar Sandoval if (ret < 0) 1495a5ed9182SOmar Sandoval goto out; 1496a5ed9182SOmar Sandoval if (ret) 1497a5ed9182SOmar Sandoval break; 1498a5ed9182SOmar Sandoval 1499a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 1500a5ed9182SOmar Sandoval 1501a5ed9182SOmar Sandoval if (key.type == BTRFS_FREE_SPACE_INFO_KEY) 1502a5ed9182SOmar Sandoval break; 1503a5ed9182SOmar Sandoval 1504a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_EXTENT_KEY); 1505a5ed9182SOmar Sandoval ASSERT(key.objectid < end && key.objectid + key.offset <= end); 1506a5ed9182SOmar Sandoval 1507a5ed9182SOmar Sandoval caching_ctl->progress = key.objectid; 1508a5ed9182SOmar Sandoval 15094457c1c7SNikolay Borisov total_found += add_new_free_space(block_group, key.objectid, 1510a5ed9182SOmar Sandoval key.objectid + key.offset); 1511a5ed9182SOmar Sandoval if (total_found > CACHING_CTL_WAKE_UP) { 1512a5ed9182SOmar Sandoval total_found = 0; 1513a5ed9182SOmar Sandoval wake_up(&caching_ctl->wait); 1514a5ed9182SOmar Sandoval } 1515a5ed9182SOmar Sandoval extent_count++; 1516a5ed9182SOmar Sandoval } 1517a5ed9182SOmar Sandoval 1518a5ed9182SOmar Sandoval if (extent_count != expected_extent_count) { 15195d163e0eSJeff Mahoney btrfs_err(fs_info, 15205d163e0eSJeff Mahoney "incorrect extent count for %llu; counted %u, expected %u", 1521a5ed9182SOmar Sandoval block_group->key.objectid, extent_count, 1522a5ed9182SOmar Sandoval expected_extent_count); 1523a5ed9182SOmar Sandoval ASSERT(0); 1524a5ed9182SOmar Sandoval ret = -EIO; 1525a5ed9182SOmar Sandoval goto out; 1526a5ed9182SOmar Sandoval } 1527a5ed9182SOmar Sandoval 1528a5ed9182SOmar Sandoval caching_ctl->progress = (u64)-1; 1529a5ed9182SOmar Sandoval 1530a5ed9182SOmar Sandoval ret = 0; 1531a5ed9182SOmar Sandoval out: 1532a5ed9182SOmar Sandoval return ret; 1533a5ed9182SOmar Sandoval } 1534a5ed9182SOmar Sandoval 1535a5ed9182SOmar Sandoval int load_free_space_tree(struct btrfs_caching_control *caching_ctl) 1536a5ed9182SOmar Sandoval { 1537a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group; 1538a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info; 1539a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 1540a5ed9182SOmar Sandoval struct btrfs_path *path; 1541a5ed9182SOmar Sandoval u32 extent_count, flags; 1542a5ed9182SOmar Sandoval int ret; 1543a5ed9182SOmar Sandoval 1544a5ed9182SOmar Sandoval block_group = caching_ctl->block_group; 1545a5ed9182SOmar Sandoval fs_info = block_group->fs_info; 1546a5ed9182SOmar Sandoval 1547a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1548a5ed9182SOmar Sandoval if (!path) 1549a5ed9182SOmar Sandoval return -ENOMEM; 1550a5ed9182SOmar Sandoval 1551a5ed9182SOmar Sandoval /* 1552a5ed9182SOmar Sandoval * Just like caching_thread() doesn't want to deadlock on the extent 1553a5ed9182SOmar Sandoval * tree, we don't want to deadlock on the free space tree. 1554a5ed9182SOmar Sandoval */ 1555a5ed9182SOmar Sandoval path->skip_locking = 1; 1556a5ed9182SOmar Sandoval path->search_commit_root = 1; 15577ce311d5SGu JinXiang path->reada = READA_FORWARD; 1558a5ed9182SOmar Sandoval 1559a5ed9182SOmar Sandoval info = search_free_space_info(NULL, fs_info, block_group, path, 0); 1560a5ed9182SOmar Sandoval if (IS_ERR(info)) { 1561a5ed9182SOmar Sandoval ret = PTR_ERR(info); 1562a5ed9182SOmar Sandoval goto out; 1563a5ed9182SOmar Sandoval } 1564a5ed9182SOmar Sandoval extent_count = btrfs_free_space_extent_count(path->nodes[0], info); 1565a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(path->nodes[0], info); 1566a5ed9182SOmar Sandoval 1567a5ed9182SOmar Sandoval /* 1568a5ed9182SOmar Sandoval * We left path pointing to the free space info item, so now 1569a5ed9182SOmar Sandoval * load_free_space_foo can just iterate through the free space tree from 1570a5ed9182SOmar Sandoval * there. 1571a5ed9182SOmar Sandoval */ 1572a5ed9182SOmar Sandoval if (flags & BTRFS_FREE_SPACE_USING_BITMAPS) 1573a5ed9182SOmar Sandoval ret = load_free_space_bitmaps(caching_ctl, path, extent_count); 1574a5ed9182SOmar Sandoval else 1575a5ed9182SOmar Sandoval ret = load_free_space_extents(caching_ctl, path, extent_count); 1576a5ed9182SOmar Sandoval 1577a5ed9182SOmar Sandoval out: 1578a5ed9182SOmar Sandoval btrfs_free_path(path); 1579a5ed9182SOmar Sandoval return ret; 1580a5ed9182SOmar Sandoval } 1581