1a5ed9182SOmar Sandoval /* 2a5ed9182SOmar Sandoval * Copyright (C) 2015 Facebook. All rights reserved. 3a5ed9182SOmar Sandoval * 4a5ed9182SOmar Sandoval * This program is free software; you can redistribute it and/or 5a5ed9182SOmar Sandoval * modify it under the terms of the GNU General Public 6a5ed9182SOmar Sandoval * License v2 as published by the Free Software Foundation. 7a5ed9182SOmar Sandoval * 8a5ed9182SOmar Sandoval * This program is distributed in the hope that it will be useful, 9a5ed9182SOmar Sandoval * but WITHOUT ANY WARRANTY; without even the implied warranty of 10a5ed9182SOmar Sandoval * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11a5ed9182SOmar Sandoval * General Public License for more details. 12a5ed9182SOmar Sandoval * 13a5ed9182SOmar Sandoval * You should have received a copy of the GNU General Public 14a5ed9182SOmar Sandoval * License along with this program; if not, write to the 15a5ed9182SOmar Sandoval * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 16a5ed9182SOmar Sandoval * Boston, MA 021110-1307, USA. 17a5ed9182SOmar Sandoval */ 18a5ed9182SOmar Sandoval 19a5ed9182SOmar Sandoval #include <linux/kernel.h> 2025ff17e8SOmar Sandoval #include <linux/sched/mm.h> 21a5ed9182SOmar Sandoval #include "ctree.h" 22a5ed9182SOmar Sandoval #include "disk-io.h" 23a5ed9182SOmar Sandoval #include "locking.h" 24a5ed9182SOmar Sandoval #include "free-space-tree.h" 25a5ed9182SOmar Sandoval #include "transaction.h" 26a5ed9182SOmar Sandoval 27a5ed9182SOmar Sandoval static int __add_block_group_free_space(struct btrfs_trans_handle *trans, 28a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info, 29a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group, 30a5ed9182SOmar Sandoval struct btrfs_path *path); 31a5ed9182SOmar Sandoval 32a5ed9182SOmar Sandoval void set_free_space_tree_thresholds(struct btrfs_block_group_cache *cache) 33a5ed9182SOmar Sandoval { 34a5ed9182SOmar Sandoval u32 bitmap_range; 35a5ed9182SOmar Sandoval size_t bitmap_size; 36a5ed9182SOmar Sandoval u64 num_bitmaps, total_bitmap_size; 37a5ed9182SOmar Sandoval 38a5ed9182SOmar Sandoval /* 39a5ed9182SOmar Sandoval * We convert to bitmaps when the disk space required for using extents 40a5ed9182SOmar Sandoval * exceeds that required for using bitmaps. 41a5ed9182SOmar Sandoval */ 42da17066cSJeff Mahoney bitmap_range = cache->fs_info->sectorsize * BTRFS_FREE_SPACE_BITMAP_BITS; 43a5ed9182SOmar Sandoval num_bitmaps = div_u64(cache->key.offset + bitmap_range - 1, 44a5ed9182SOmar Sandoval bitmap_range); 45a5ed9182SOmar Sandoval bitmap_size = sizeof(struct btrfs_item) + BTRFS_FREE_SPACE_BITMAP_SIZE; 46a5ed9182SOmar Sandoval total_bitmap_size = num_bitmaps * bitmap_size; 47a5ed9182SOmar Sandoval cache->bitmap_high_thresh = div_u64(total_bitmap_size, 48a5ed9182SOmar Sandoval sizeof(struct btrfs_item)); 49a5ed9182SOmar Sandoval 50a5ed9182SOmar Sandoval /* 51a5ed9182SOmar Sandoval * We allow for a small buffer between the high threshold and low 52a5ed9182SOmar Sandoval * threshold to avoid thrashing back and forth between the two formats. 53a5ed9182SOmar Sandoval */ 54a5ed9182SOmar Sandoval if (cache->bitmap_high_thresh > 100) 55a5ed9182SOmar Sandoval cache->bitmap_low_thresh = cache->bitmap_high_thresh - 100; 56a5ed9182SOmar Sandoval else 57a5ed9182SOmar Sandoval cache->bitmap_low_thresh = 0; 58a5ed9182SOmar Sandoval } 59a5ed9182SOmar Sandoval 60a5ed9182SOmar Sandoval static int add_new_free_space_info(struct btrfs_trans_handle *trans, 61a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info, 62a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group, 63a5ed9182SOmar Sandoval struct btrfs_path *path) 64a5ed9182SOmar Sandoval { 65a5ed9182SOmar Sandoval struct btrfs_root *root = fs_info->free_space_root; 66a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 67a5ed9182SOmar Sandoval struct btrfs_key key; 68a5ed9182SOmar Sandoval struct extent_buffer *leaf; 69a5ed9182SOmar Sandoval int ret; 70a5ed9182SOmar Sandoval 71a5ed9182SOmar Sandoval key.objectid = block_group->key.objectid; 72a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_INFO_KEY; 73a5ed9182SOmar Sandoval key.offset = block_group->key.offset; 74a5ed9182SOmar Sandoval 75a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(*info)); 76a5ed9182SOmar Sandoval if (ret) 77a5ed9182SOmar Sandoval goto out; 78a5ed9182SOmar Sandoval 79a5ed9182SOmar Sandoval leaf = path->nodes[0]; 80a5ed9182SOmar Sandoval info = btrfs_item_ptr(leaf, path->slots[0], 81a5ed9182SOmar Sandoval struct btrfs_free_space_info); 82a5ed9182SOmar Sandoval btrfs_set_free_space_extent_count(leaf, info, 0); 83a5ed9182SOmar Sandoval btrfs_set_free_space_flags(leaf, info, 0); 84a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 85a5ed9182SOmar Sandoval 86a5ed9182SOmar Sandoval ret = 0; 87a5ed9182SOmar Sandoval out: 88a5ed9182SOmar Sandoval btrfs_release_path(path); 89a5ed9182SOmar Sandoval return ret; 90a5ed9182SOmar Sandoval } 91a5ed9182SOmar Sandoval 92a5ed9182SOmar Sandoval struct btrfs_free_space_info * 93a5ed9182SOmar Sandoval search_free_space_info(struct btrfs_trans_handle *trans, 94a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info, 95a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group, 96a5ed9182SOmar Sandoval struct btrfs_path *path, int cow) 97a5ed9182SOmar Sandoval { 98a5ed9182SOmar Sandoval struct btrfs_root *root = fs_info->free_space_root; 99a5ed9182SOmar Sandoval struct btrfs_key key; 100a5ed9182SOmar Sandoval int ret; 101a5ed9182SOmar Sandoval 102a5ed9182SOmar Sandoval key.objectid = block_group->key.objectid; 103a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_INFO_KEY; 104a5ed9182SOmar Sandoval key.offset = block_group->key.offset; 105a5ed9182SOmar Sandoval 106a5ed9182SOmar Sandoval ret = btrfs_search_slot(trans, root, &key, path, 0, cow); 107a5ed9182SOmar Sandoval if (ret < 0) 108a5ed9182SOmar Sandoval return ERR_PTR(ret); 109a5ed9182SOmar Sandoval if (ret != 0) { 110ab8d0fc4SJeff Mahoney btrfs_warn(fs_info, "missing free space info for %llu", 111a5ed9182SOmar Sandoval block_group->key.objectid); 112a5ed9182SOmar Sandoval ASSERT(0); 113a5ed9182SOmar Sandoval return ERR_PTR(-ENOENT); 114a5ed9182SOmar Sandoval } 115a5ed9182SOmar Sandoval 116a5ed9182SOmar Sandoval return btrfs_item_ptr(path->nodes[0], path->slots[0], 117a5ed9182SOmar Sandoval struct btrfs_free_space_info); 118a5ed9182SOmar Sandoval } 119a5ed9182SOmar Sandoval 120a5ed9182SOmar Sandoval /* 121a5ed9182SOmar Sandoval * btrfs_search_slot() but we're looking for the greatest key less than the 122a5ed9182SOmar Sandoval * passed key. 123a5ed9182SOmar Sandoval */ 124a5ed9182SOmar Sandoval static int btrfs_search_prev_slot(struct btrfs_trans_handle *trans, 125a5ed9182SOmar Sandoval struct btrfs_root *root, 126a5ed9182SOmar Sandoval struct btrfs_key *key, struct btrfs_path *p, 127a5ed9182SOmar Sandoval int ins_len, int cow) 128a5ed9182SOmar Sandoval { 129a5ed9182SOmar Sandoval int ret; 130a5ed9182SOmar Sandoval 131a5ed9182SOmar Sandoval ret = btrfs_search_slot(trans, root, key, p, ins_len, cow); 132a5ed9182SOmar Sandoval if (ret < 0) 133a5ed9182SOmar Sandoval return ret; 134a5ed9182SOmar Sandoval 135a5ed9182SOmar Sandoval if (ret == 0) { 136a5ed9182SOmar Sandoval ASSERT(0); 137a5ed9182SOmar Sandoval return -EIO; 138a5ed9182SOmar Sandoval } 139a5ed9182SOmar Sandoval 140a5ed9182SOmar Sandoval if (p->slots[0] == 0) { 141a5ed9182SOmar Sandoval ASSERT(0); 142a5ed9182SOmar Sandoval return -EIO; 143a5ed9182SOmar Sandoval } 144a5ed9182SOmar Sandoval p->slots[0]--; 145a5ed9182SOmar Sandoval 146a5ed9182SOmar Sandoval return 0; 147a5ed9182SOmar Sandoval } 148a5ed9182SOmar Sandoval 149a5ed9182SOmar Sandoval static inline u32 free_space_bitmap_size(u64 size, u32 sectorsize) 150a5ed9182SOmar Sandoval { 151a5ed9182SOmar Sandoval return DIV_ROUND_UP((u32)div_u64(size, sectorsize), BITS_PER_BYTE); 152a5ed9182SOmar Sandoval } 153a5ed9182SOmar Sandoval 1542fe1d551SOmar Sandoval static u8 *alloc_bitmap(u32 bitmap_size) 155a5ed9182SOmar Sandoval { 15625ff17e8SOmar Sandoval u8 *ret; 15725ff17e8SOmar Sandoval unsigned int nofs_flag; 15879b134a2SDavid Sterba 15979b134a2SDavid Sterba /* 16025ff17e8SOmar Sandoval * GFP_NOFS doesn't work with kvmalloc(), but we really can't recurse 16125ff17e8SOmar Sandoval * into the filesystem as the free space bitmap can be modified in the 16225ff17e8SOmar Sandoval * critical section of a transaction commit. 16325ff17e8SOmar Sandoval * 16425ff17e8SOmar Sandoval * TODO: push the memalloc_nofs_{save,restore}() to the caller where we 16525ff17e8SOmar Sandoval * know that recursion is unsafe. 16679b134a2SDavid Sterba */ 16725ff17e8SOmar Sandoval nofs_flag = memalloc_nofs_save(); 16825ff17e8SOmar Sandoval ret = kvzalloc(bitmap_size, GFP_KERNEL); 16925ff17e8SOmar Sandoval memalloc_nofs_restore(nofs_flag); 17025ff17e8SOmar Sandoval return ret; 171a5ed9182SOmar Sandoval } 172a5ed9182SOmar Sandoval 173a5ed9182SOmar Sandoval int convert_free_space_to_bitmaps(struct btrfs_trans_handle *trans, 174a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info, 175a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group, 176a5ed9182SOmar Sandoval struct btrfs_path *path) 177a5ed9182SOmar Sandoval { 178a5ed9182SOmar Sandoval struct btrfs_root *root = fs_info->free_space_root; 179a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 180a5ed9182SOmar Sandoval struct btrfs_key key, found_key; 181a5ed9182SOmar Sandoval struct extent_buffer *leaf; 1822fe1d551SOmar Sandoval u8 *bitmap, *bitmap_cursor; 183a5ed9182SOmar Sandoval u64 start, end; 184a5ed9182SOmar Sandoval u64 bitmap_range, i; 185a5ed9182SOmar Sandoval u32 bitmap_size, flags, expected_extent_count; 186a5ed9182SOmar Sandoval u32 extent_count = 0; 187a5ed9182SOmar Sandoval int done = 0, nr; 188a5ed9182SOmar Sandoval int ret; 189a5ed9182SOmar Sandoval 190a5ed9182SOmar Sandoval bitmap_size = free_space_bitmap_size(block_group->key.offset, 1910b246afaSJeff Mahoney fs_info->sectorsize); 192a5ed9182SOmar Sandoval bitmap = alloc_bitmap(bitmap_size); 193a5ed9182SOmar Sandoval if (!bitmap) { 194a5ed9182SOmar Sandoval ret = -ENOMEM; 195a5ed9182SOmar Sandoval goto out; 196a5ed9182SOmar Sandoval } 197a5ed9182SOmar Sandoval 198a5ed9182SOmar Sandoval start = block_group->key.objectid; 199a5ed9182SOmar Sandoval end = block_group->key.objectid + block_group->key.offset; 200a5ed9182SOmar Sandoval 201a5ed9182SOmar Sandoval key.objectid = end - 1; 202a5ed9182SOmar Sandoval key.type = (u8)-1; 203a5ed9182SOmar Sandoval key.offset = (u64)-1; 204a5ed9182SOmar Sandoval 205a5ed9182SOmar Sandoval while (!done) { 206a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 207a5ed9182SOmar Sandoval if (ret) 208a5ed9182SOmar Sandoval goto out; 209a5ed9182SOmar Sandoval 210a5ed9182SOmar Sandoval leaf = path->nodes[0]; 211a5ed9182SOmar Sandoval nr = 0; 212a5ed9182SOmar Sandoval path->slots[0]++; 213a5ed9182SOmar Sandoval while (path->slots[0] > 0) { 214a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0] - 1); 215a5ed9182SOmar Sandoval 216a5ed9182SOmar Sandoval if (found_key.type == BTRFS_FREE_SPACE_INFO_KEY) { 217a5ed9182SOmar Sandoval ASSERT(found_key.objectid == block_group->key.objectid); 218a5ed9182SOmar Sandoval ASSERT(found_key.offset == block_group->key.offset); 219a5ed9182SOmar Sandoval done = 1; 220a5ed9182SOmar Sandoval break; 221a5ed9182SOmar Sandoval } else if (found_key.type == BTRFS_FREE_SPACE_EXTENT_KEY) { 222a5ed9182SOmar Sandoval u64 first, last; 223a5ed9182SOmar Sandoval 224a5ed9182SOmar Sandoval ASSERT(found_key.objectid >= start); 225a5ed9182SOmar Sandoval ASSERT(found_key.objectid < end); 226a5ed9182SOmar Sandoval ASSERT(found_key.objectid + found_key.offset <= end); 227a5ed9182SOmar Sandoval 228a5ed9182SOmar Sandoval first = div_u64(found_key.objectid - start, 2290b246afaSJeff Mahoney fs_info->sectorsize); 230a5ed9182SOmar Sandoval last = div_u64(found_key.objectid + found_key.offset - start, 2310b246afaSJeff Mahoney fs_info->sectorsize); 2322fe1d551SOmar Sandoval le_bitmap_set(bitmap, first, last - first); 233a5ed9182SOmar Sandoval 234a5ed9182SOmar Sandoval extent_count++; 235a5ed9182SOmar Sandoval nr++; 236a5ed9182SOmar Sandoval path->slots[0]--; 237a5ed9182SOmar Sandoval } else { 238a5ed9182SOmar Sandoval ASSERT(0); 239a5ed9182SOmar Sandoval } 240a5ed9182SOmar Sandoval } 241a5ed9182SOmar Sandoval 242a5ed9182SOmar Sandoval ret = btrfs_del_items(trans, root, path, path->slots[0], nr); 243a5ed9182SOmar Sandoval if (ret) 244a5ed9182SOmar Sandoval goto out; 245a5ed9182SOmar Sandoval btrfs_release_path(path); 246a5ed9182SOmar Sandoval } 247a5ed9182SOmar Sandoval 248a5ed9182SOmar Sandoval info = search_free_space_info(trans, fs_info, block_group, path, 1); 249a5ed9182SOmar Sandoval if (IS_ERR(info)) { 250a5ed9182SOmar Sandoval ret = PTR_ERR(info); 251a5ed9182SOmar Sandoval goto out; 252a5ed9182SOmar Sandoval } 253a5ed9182SOmar Sandoval leaf = path->nodes[0]; 254a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(leaf, info); 255a5ed9182SOmar Sandoval flags |= BTRFS_FREE_SPACE_USING_BITMAPS; 256a5ed9182SOmar Sandoval btrfs_set_free_space_flags(leaf, info, flags); 257a5ed9182SOmar Sandoval expected_extent_count = btrfs_free_space_extent_count(leaf, info); 258a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 259a5ed9182SOmar Sandoval btrfs_release_path(path); 260a5ed9182SOmar Sandoval 261a5ed9182SOmar Sandoval if (extent_count != expected_extent_count) { 2625d163e0eSJeff Mahoney btrfs_err(fs_info, 2635d163e0eSJeff Mahoney "incorrect extent count for %llu; counted %u, expected %u", 264a5ed9182SOmar Sandoval block_group->key.objectid, extent_count, 265a5ed9182SOmar Sandoval expected_extent_count); 266a5ed9182SOmar Sandoval ASSERT(0); 267a5ed9182SOmar Sandoval ret = -EIO; 268a5ed9182SOmar Sandoval goto out; 269a5ed9182SOmar Sandoval } 270a5ed9182SOmar Sandoval 2712fe1d551SOmar Sandoval bitmap_cursor = bitmap; 2720b246afaSJeff Mahoney bitmap_range = fs_info->sectorsize * BTRFS_FREE_SPACE_BITMAP_BITS; 273a5ed9182SOmar Sandoval i = start; 274a5ed9182SOmar Sandoval while (i < end) { 275a5ed9182SOmar Sandoval unsigned long ptr; 276a5ed9182SOmar Sandoval u64 extent_size; 277a5ed9182SOmar Sandoval u32 data_size; 278a5ed9182SOmar Sandoval 279a5ed9182SOmar Sandoval extent_size = min(end - i, bitmap_range); 280a5ed9182SOmar Sandoval data_size = free_space_bitmap_size(extent_size, 2810b246afaSJeff Mahoney fs_info->sectorsize); 282a5ed9182SOmar Sandoval 283a5ed9182SOmar Sandoval key.objectid = i; 284a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_BITMAP_KEY; 285a5ed9182SOmar Sandoval key.offset = extent_size; 286a5ed9182SOmar Sandoval 287a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, 288a5ed9182SOmar Sandoval data_size); 289a5ed9182SOmar Sandoval if (ret) 290a5ed9182SOmar Sandoval goto out; 291a5ed9182SOmar Sandoval 292a5ed9182SOmar Sandoval leaf = path->nodes[0]; 293a5ed9182SOmar Sandoval ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); 294a5ed9182SOmar Sandoval write_extent_buffer(leaf, bitmap_cursor, ptr, 295a5ed9182SOmar Sandoval data_size); 296a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 297a5ed9182SOmar Sandoval btrfs_release_path(path); 298a5ed9182SOmar Sandoval 299a5ed9182SOmar Sandoval i += extent_size; 300a5ed9182SOmar Sandoval bitmap_cursor += data_size; 301a5ed9182SOmar Sandoval } 302a5ed9182SOmar Sandoval 303a5ed9182SOmar Sandoval ret = 0; 304a5ed9182SOmar Sandoval out: 30579b134a2SDavid Sterba kvfree(bitmap); 306a5ed9182SOmar Sandoval if (ret) 30766642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 308a5ed9182SOmar Sandoval return ret; 309a5ed9182SOmar Sandoval } 310a5ed9182SOmar Sandoval 311a5ed9182SOmar Sandoval int convert_free_space_to_extents(struct btrfs_trans_handle *trans, 312a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info, 313a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group, 314a5ed9182SOmar Sandoval struct btrfs_path *path) 315a5ed9182SOmar Sandoval { 316a5ed9182SOmar Sandoval struct btrfs_root *root = fs_info->free_space_root; 317a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 318a5ed9182SOmar Sandoval struct btrfs_key key, found_key; 319a5ed9182SOmar Sandoval struct extent_buffer *leaf; 3202fe1d551SOmar Sandoval u8 *bitmap; 321a5ed9182SOmar Sandoval u64 start, end; 322a5ed9182SOmar Sandoval /* Initialize to silence GCC. */ 323a5ed9182SOmar Sandoval u64 extent_start = 0; 324a5ed9182SOmar Sandoval u64 offset; 325a5ed9182SOmar Sandoval u32 bitmap_size, flags, expected_extent_count; 326a5ed9182SOmar Sandoval int prev_bit = 0, bit, bitnr; 327a5ed9182SOmar Sandoval u32 extent_count = 0; 328a5ed9182SOmar Sandoval int done = 0, nr; 329a5ed9182SOmar Sandoval int ret; 330a5ed9182SOmar Sandoval 331a5ed9182SOmar Sandoval bitmap_size = free_space_bitmap_size(block_group->key.offset, 3320b246afaSJeff Mahoney fs_info->sectorsize); 333a5ed9182SOmar Sandoval bitmap = alloc_bitmap(bitmap_size); 334a5ed9182SOmar Sandoval if (!bitmap) { 335a5ed9182SOmar Sandoval ret = -ENOMEM; 336a5ed9182SOmar Sandoval goto out; 337a5ed9182SOmar Sandoval } 338a5ed9182SOmar Sandoval 339a5ed9182SOmar Sandoval start = block_group->key.objectid; 340a5ed9182SOmar Sandoval end = block_group->key.objectid + block_group->key.offset; 341a5ed9182SOmar Sandoval 342a5ed9182SOmar Sandoval key.objectid = end - 1; 343a5ed9182SOmar Sandoval key.type = (u8)-1; 344a5ed9182SOmar Sandoval key.offset = (u64)-1; 345a5ed9182SOmar Sandoval 346a5ed9182SOmar Sandoval while (!done) { 347a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 348a5ed9182SOmar Sandoval if (ret) 349a5ed9182SOmar Sandoval goto out; 350a5ed9182SOmar Sandoval 351a5ed9182SOmar Sandoval leaf = path->nodes[0]; 352a5ed9182SOmar Sandoval nr = 0; 353a5ed9182SOmar Sandoval path->slots[0]++; 354a5ed9182SOmar Sandoval while (path->slots[0] > 0) { 355a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0] - 1); 356a5ed9182SOmar Sandoval 357a5ed9182SOmar Sandoval if (found_key.type == BTRFS_FREE_SPACE_INFO_KEY) { 358a5ed9182SOmar Sandoval ASSERT(found_key.objectid == block_group->key.objectid); 359a5ed9182SOmar Sandoval ASSERT(found_key.offset == block_group->key.offset); 360a5ed9182SOmar Sandoval done = 1; 361a5ed9182SOmar Sandoval break; 362a5ed9182SOmar Sandoval } else if (found_key.type == BTRFS_FREE_SPACE_BITMAP_KEY) { 363a5ed9182SOmar Sandoval unsigned long ptr; 3642fe1d551SOmar Sandoval u8 *bitmap_cursor; 365a5ed9182SOmar Sandoval u32 bitmap_pos, data_size; 366a5ed9182SOmar Sandoval 367a5ed9182SOmar Sandoval ASSERT(found_key.objectid >= start); 368a5ed9182SOmar Sandoval ASSERT(found_key.objectid < end); 369a5ed9182SOmar Sandoval ASSERT(found_key.objectid + found_key.offset <= end); 370a5ed9182SOmar Sandoval 371a5ed9182SOmar Sandoval bitmap_pos = div_u64(found_key.objectid - start, 3720b246afaSJeff Mahoney fs_info->sectorsize * 373a5ed9182SOmar Sandoval BITS_PER_BYTE); 3742fe1d551SOmar Sandoval bitmap_cursor = bitmap + bitmap_pos; 375a5ed9182SOmar Sandoval data_size = free_space_bitmap_size(found_key.offset, 3760b246afaSJeff Mahoney fs_info->sectorsize); 377a5ed9182SOmar Sandoval 378a5ed9182SOmar Sandoval ptr = btrfs_item_ptr_offset(leaf, path->slots[0] - 1); 379a5ed9182SOmar Sandoval read_extent_buffer(leaf, bitmap_cursor, ptr, 380a5ed9182SOmar Sandoval data_size); 381a5ed9182SOmar Sandoval 382a5ed9182SOmar Sandoval nr++; 383a5ed9182SOmar Sandoval path->slots[0]--; 384a5ed9182SOmar Sandoval } else { 385a5ed9182SOmar Sandoval ASSERT(0); 386a5ed9182SOmar Sandoval } 387a5ed9182SOmar Sandoval } 388a5ed9182SOmar Sandoval 389a5ed9182SOmar Sandoval ret = btrfs_del_items(trans, root, path, path->slots[0], nr); 390a5ed9182SOmar Sandoval if (ret) 391a5ed9182SOmar Sandoval goto out; 392a5ed9182SOmar Sandoval btrfs_release_path(path); 393a5ed9182SOmar Sandoval } 394a5ed9182SOmar Sandoval 395a5ed9182SOmar Sandoval info = search_free_space_info(trans, fs_info, block_group, path, 1); 396a5ed9182SOmar Sandoval if (IS_ERR(info)) { 397a5ed9182SOmar Sandoval ret = PTR_ERR(info); 398a5ed9182SOmar Sandoval goto out; 399a5ed9182SOmar Sandoval } 400a5ed9182SOmar Sandoval leaf = path->nodes[0]; 401a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(leaf, info); 402a5ed9182SOmar Sandoval flags &= ~BTRFS_FREE_SPACE_USING_BITMAPS; 403a5ed9182SOmar Sandoval btrfs_set_free_space_flags(leaf, info, flags); 404a5ed9182SOmar Sandoval expected_extent_count = btrfs_free_space_extent_count(leaf, info); 405a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 406a5ed9182SOmar Sandoval btrfs_release_path(path); 407a5ed9182SOmar Sandoval 408a5ed9182SOmar Sandoval offset = start; 409a5ed9182SOmar Sandoval bitnr = 0; 410a5ed9182SOmar Sandoval while (offset < end) { 4112fe1d551SOmar Sandoval bit = !!le_test_bit(bitnr, bitmap); 412a5ed9182SOmar Sandoval if (prev_bit == 0 && bit == 1) { 413a5ed9182SOmar Sandoval extent_start = offset; 414a5ed9182SOmar Sandoval } else if (prev_bit == 1 && bit == 0) { 415a5ed9182SOmar Sandoval key.objectid = extent_start; 416a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_EXTENT_KEY; 417a5ed9182SOmar Sandoval key.offset = offset - extent_start; 418a5ed9182SOmar Sandoval 419a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, 0); 420a5ed9182SOmar Sandoval if (ret) 421a5ed9182SOmar Sandoval goto out; 422a5ed9182SOmar Sandoval btrfs_release_path(path); 423a5ed9182SOmar Sandoval 424a5ed9182SOmar Sandoval extent_count++; 425a5ed9182SOmar Sandoval } 426a5ed9182SOmar Sandoval prev_bit = bit; 4270b246afaSJeff Mahoney offset += fs_info->sectorsize; 428a5ed9182SOmar Sandoval bitnr++; 429a5ed9182SOmar Sandoval } 430a5ed9182SOmar Sandoval if (prev_bit == 1) { 431a5ed9182SOmar Sandoval key.objectid = extent_start; 432a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_EXTENT_KEY; 433a5ed9182SOmar Sandoval key.offset = end - extent_start; 434a5ed9182SOmar Sandoval 435a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, 0); 436a5ed9182SOmar Sandoval if (ret) 437a5ed9182SOmar Sandoval goto out; 438a5ed9182SOmar Sandoval btrfs_release_path(path); 439a5ed9182SOmar Sandoval 440a5ed9182SOmar Sandoval extent_count++; 441a5ed9182SOmar Sandoval } 442a5ed9182SOmar Sandoval 443a5ed9182SOmar Sandoval if (extent_count != expected_extent_count) { 4445d163e0eSJeff Mahoney btrfs_err(fs_info, 4455d163e0eSJeff Mahoney "incorrect extent count for %llu; counted %u, expected %u", 446a5ed9182SOmar Sandoval block_group->key.objectid, extent_count, 447a5ed9182SOmar Sandoval expected_extent_count); 448a5ed9182SOmar Sandoval ASSERT(0); 449a5ed9182SOmar Sandoval ret = -EIO; 450a5ed9182SOmar Sandoval goto out; 451a5ed9182SOmar Sandoval } 452a5ed9182SOmar Sandoval 453a5ed9182SOmar Sandoval ret = 0; 454a5ed9182SOmar Sandoval out: 45579b134a2SDavid Sterba kvfree(bitmap); 456a5ed9182SOmar Sandoval if (ret) 45766642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 458a5ed9182SOmar Sandoval return ret; 459a5ed9182SOmar Sandoval } 460a5ed9182SOmar Sandoval 461a5ed9182SOmar Sandoval static int update_free_space_extent_count(struct btrfs_trans_handle *trans, 462a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info, 463a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group, 464a5ed9182SOmar Sandoval struct btrfs_path *path, 465a5ed9182SOmar Sandoval int new_extents) 466a5ed9182SOmar Sandoval { 467a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 468a5ed9182SOmar Sandoval u32 flags; 469a5ed9182SOmar Sandoval u32 extent_count; 470a5ed9182SOmar Sandoval int ret = 0; 471a5ed9182SOmar Sandoval 472a5ed9182SOmar Sandoval if (new_extents == 0) 473a5ed9182SOmar Sandoval return 0; 474a5ed9182SOmar Sandoval 475a5ed9182SOmar Sandoval info = search_free_space_info(trans, fs_info, block_group, path, 1); 476a5ed9182SOmar Sandoval if (IS_ERR(info)) { 477a5ed9182SOmar Sandoval ret = PTR_ERR(info); 478a5ed9182SOmar Sandoval goto out; 479a5ed9182SOmar Sandoval } 480a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(path->nodes[0], info); 481a5ed9182SOmar Sandoval extent_count = btrfs_free_space_extent_count(path->nodes[0], info); 482a5ed9182SOmar Sandoval 483a5ed9182SOmar Sandoval extent_count += new_extents; 484a5ed9182SOmar Sandoval btrfs_set_free_space_extent_count(path->nodes[0], info, extent_count); 485a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(path->nodes[0]); 486a5ed9182SOmar Sandoval btrfs_release_path(path); 487a5ed9182SOmar Sandoval 488a5ed9182SOmar Sandoval if (!(flags & BTRFS_FREE_SPACE_USING_BITMAPS) && 489a5ed9182SOmar Sandoval extent_count > block_group->bitmap_high_thresh) { 490a5ed9182SOmar Sandoval ret = convert_free_space_to_bitmaps(trans, fs_info, block_group, 491a5ed9182SOmar Sandoval path); 492a5ed9182SOmar Sandoval } else if ((flags & BTRFS_FREE_SPACE_USING_BITMAPS) && 493a5ed9182SOmar Sandoval extent_count < block_group->bitmap_low_thresh) { 494a5ed9182SOmar Sandoval ret = convert_free_space_to_extents(trans, fs_info, block_group, 495a5ed9182SOmar Sandoval path); 496a5ed9182SOmar Sandoval } 497a5ed9182SOmar Sandoval 498a5ed9182SOmar Sandoval out: 499a5ed9182SOmar Sandoval return ret; 500a5ed9182SOmar Sandoval } 501a5ed9182SOmar Sandoval 502a5ed9182SOmar Sandoval int free_space_test_bit(struct btrfs_block_group_cache *block_group, 503a5ed9182SOmar Sandoval struct btrfs_path *path, u64 offset) 504a5ed9182SOmar Sandoval { 505a5ed9182SOmar Sandoval struct extent_buffer *leaf; 506a5ed9182SOmar Sandoval struct btrfs_key key; 507a5ed9182SOmar Sandoval u64 found_start, found_end; 508a5ed9182SOmar Sandoval unsigned long ptr, i; 509a5ed9182SOmar Sandoval 510a5ed9182SOmar Sandoval leaf = path->nodes[0]; 511a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); 512a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_BITMAP_KEY); 513a5ed9182SOmar Sandoval 514a5ed9182SOmar Sandoval found_start = key.objectid; 515a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 516a5ed9182SOmar Sandoval ASSERT(offset >= found_start && offset < found_end); 517a5ed9182SOmar Sandoval 518a5ed9182SOmar Sandoval ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); 519da17066cSJeff Mahoney i = div_u64(offset - found_start, 520da17066cSJeff Mahoney block_group->fs_info->sectorsize); 521a5ed9182SOmar Sandoval return !!extent_buffer_test_bit(leaf, ptr, i); 522a5ed9182SOmar Sandoval } 523a5ed9182SOmar Sandoval 524a5ed9182SOmar Sandoval static void free_space_set_bits(struct btrfs_block_group_cache *block_group, 525a5ed9182SOmar Sandoval struct btrfs_path *path, u64 *start, u64 *size, 526a5ed9182SOmar Sandoval int bit) 527a5ed9182SOmar Sandoval { 5280b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = block_group->fs_info; 529a5ed9182SOmar Sandoval struct extent_buffer *leaf; 530a5ed9182SOmar Sandoval struct btrfs_key key; 531a5ed9182SOmar Sandoval u64 end = *start + *size; 532a5ed9182SOmar Sandoval u64 found_start, found_end; 533a5ed9182SOmar Sandoval unsigned long ptr, first, last; 534a5ed9182SOmar Sandoval 535a5ed9182SOmar Sandoval leaf = path->nodes[0]; 536a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); 537a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_BITMAP_KEY); 538a5ed9182SOmar Sandoval 539a5ed9182SOmar Sandoval found_start = key.objectid; 540a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 541a5ed9182SOmar Sandoval ASSERT(*start >= found_start && *start < found_end); 542a5ed9182SOmar Sandoval ASSERT(end > found_start); 543a5ed9182SOmar Sandoval 544a5ed9182SOmar Sandoval if (end > found_end) 545a5ed9182SOmar Sandoval end = found_end; 546a5ed9182SOmar Sandoval 547a5ed9182SOmar Sandoval ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); 5480b246afaSJeff Mahoney first = div_u64(*start - found_start, fs_info->sectorsize); 5490b246afaSJeff Mahoney last = div_u64(end - found_start, fs_info->sectorsize); 550a5ed9182SOmar Sandoval if (bit) 551a5ed9182SOmar Sandoval extent_buffer_bitmap_set(leaf, ptr, first, last - first); 552a5ed9182SOmar Sandoval else 553a5ed9182SOmar Sandoval extent_buffer_bitmap_clear(leaf, ptr, first, last - first); 554a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 555a5ed9182SOmar Sandoval 556a5ed9182SOmar Sandoval *size -= end - *start; 557a5ed9182SOmar Sandoval *start = end; 558a5ed9182SOmar Sandoval } 559a5ed9182SOmar Sandoval 560a5ed9182SOmar Sandoval /* 561a5ed9182SOmar Sandoval * We can't use btrfs_next_item() in modify_free_space_bitmap() because 562a5ed9182SOmar Sandoval * btrfs_next_leaf() doesn't get the path for writing. We can forgo the fancy 563a5ed9182SOmar Sandoval * tree walking in btrfs_next_leaf() anyways because we know exactly what we're 564a5ed9182SOmar Sandoval * looking for. 565a5ed9182SOmar Sandoval */ 566a5ed9182SOmar Sandoval static int free_space_next_bitmap(struct btrfs_trans_handle *trans, 567a5ed9182SOmar Sandoval struct btrfs_root *root, struct btrfs_path *p) 568a5ed9182SOmar Sandoval { 569a5ed9182SOmar Sandoval struct btrfs_key key; 570a5ed9182SOmar Sandoval 571a5ed9182SOmar Sandoval if (p->slots[0] + 1 < btrfs_header_nritems(p->nodes[0])) { 572a5ed9182SOmar Sandoval p->slots[0]++; 573a5ed9182SOmar Sandoval return 0; 574a5ed9182SOmar Sandoval } 575a5ed9182SOmar Sandoval 576a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(p->nodes[0], &key, p->slots[0]); 577a5ed9182SOmar Sandoval btrfs_release_path(p); 578a5ed9182SOmar Sandoval 579a5ed9182SOmar Sandoval key.objectid += key.offset; 580a5ed9182SOmar Sandoval key.type = (u8)-1; 581a5ed9182SOmar Sandoval key.offset = (u64)-1; 582a5ed9182SOmar Sandoval 583a5ed9182SOmar Sandoval return btrfs_search_prev_slot(trans, root, &key, p, 0, 1); 584a5ed9182SOmar Sandoval } 585a5ed9182SOmar Sandoval 586a5ed9182SOmar Sandoval /* 587a5ed9182SOmar Sandoval * If remove is 1, then we are removing free space, thus clearing bits in the 588a5ed9182SOmar Sandoval * bitmap. If remove is 0, then we are adding free space, thus setting bits in 589a5ed9182SOmar Sandoval * the bitmap. 590a5ed9182SOmar Sandoval */ 591a5ed9182SOmar Sandoval static int modify_free_space_bitmap(struct btrfs_trans_handle *trans, 592a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info, 593a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group, 594a5ed9182SOmar Sandoval struct btrfs_path *path, 595a5ed9182SOmar Sandoval u64 start, u64 size, int remove) 596a5ed9182SOmar Sandoval { 597a5ed9182SOmar Sandoval struct btrfs_root *root = fs_info->free_space_root; 598a5ed9182SOmar Sandoval struct btrfs_key key; 599a5ed9182SOmar Sandoval u64 end = start + size; 600a5ed9182SOmar Sandoval u64 cur_start, cur_size; 601a5ed9182SOmar Sandoval int prev_bit, next_bit; 602a5ed9182SOmar Sandoval int new_extents; 603a5ed9182SOmar Sandoval int ret; 604a5ed9182SOmar Sandoval 605a5ed9182SOmar Sandoval /* 606a5ed9182SOmar Sandoval * Read the bit for the block immediately before the extent of space if 607a5ed9182SOmar Sandoval * that block is within the block group. 608a5ed9182SOmar Sandoval */ 609a5ed9182SOmar Sandoval if (start > block_group->key.objectid) { 610da17066cSJeff Mahoney u64 prev_block = start - block_group->fs_info->sectorsize; 611a5ed9182SOmar Sandoval 612a5ed9182SOmar Sandoval key.objectid = prev_block; 613a5ed9182SOmar Sandoval key.type = (u8)-1; 614a5ed9182SOmar Sandoval key.offset = (u64)-1; 615a5ed9182SOmar Sandoval 616a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, 0, 1); 617a5ed9182SOmar Sandoval if (ret) 618a5ed9182SOmar Sandoval goto out; 619a5ed9182SOmar Sandoval 620a5ed9182SOmar Sandoval prev_bit = free_space_test_bit(block_group, path, prev_block); 621a5ed9182SOmar Sandoval 622a5ed9182SOmar Sandoval /* The previous block may have been in the previous bitmap. */ 623a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 624a5ed9182SOmar Sandoval if (start >= key.objectid + key.offset) { 625a5ed9182SOmar Sandoval ret = free_space_next_bitmap(trans, root, path); 626a5ed9182SOmar Sandoval if (ret) 627a5ed9182SOmar Sandoval goto out; 628a5ed9182SOmar Sandoval } 629a5ed9182SOmar Sandoval } else { 630a5ed9182SOmar Sandoval key.objectid = start; 631a5ed9182SOmar Sandoval key.type = (u8)-1; 632a5ed9182SOmar Sandoval key.offset = (u64)-1; 633a5ed9182SOmar Sandoval 634a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, 0, 1); 635a5ed9182SOmar Sandoval if (ret) 636a5ed9182SOmar Sandoval goto out; 637a5ed9182SOmar Sandoval 638a5ed9182SOmar Sandoval prev_bit = -1; 639a5ed9182SOmar Sandoval } 640a5ed9182SOmar Sandoval 641a5ed9182SOmar Sandoval /* 642a5ed9182SOmar Sandoval * Iterate over all of the bitmaps overlapped by the extent of space, 643a5ed9182SOmar Sandoval * clearing/setting bits as required. 644a5ed9182SOmar Sandoval */ 645a5ed9182SOmar Sandoval cur_start = start; 646a5ed9182SOmar Sandoval cur_size = size; 647a5ed9182SOmar Sandoval while (1) { 648a5ed9182SOmar Sandoval free_space_set_bits(block_group, path, &cur_start, &cur_size, 649a5ed9182SOmar Sandoval !remove); 650a5ed9182SOmar Sandoval if (cur_size == 0) 651a5ed9182SOmar Sandoval break; 652a5ed9182SOmar Sandoval ret = free_space_next_bitmap(trans, root, path); 653a5ed9182SOmar Sandoval if (ret) 654a5ed9182SOmar Sandoval goto out; 655a5ed9182SOmar Sandoval } 656a5ed9182SOmar Sandoval 657a5ed9182SOmar Sandoval /* 658a5ed9182SOmar Sandoval * Read the bit for the block immediately after the extent of space if 659a5ed9182SOmar Sandoval * that block is within the block group. 660a5ed9182SOmar Sandoval */ 661a5ed9182SOmar Sandoval if (end < block_group->key.objectid + block_group->key.offset) { 662a5ed9182SOmar Sandoval /* The next block may be in the next bitmap. */ 663a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 664a5ed9182SOmar Sandoval if (end >= key.objectid + key.offset) { 665a5ed9182SOmar Sandoval ret = free_space_next_bitmap(trans, root, path); 666a5ed9182SOmar Sandoval if (ret) 667a5ed9182SOmar Sandoval goto out; 668a5ed9182SOmar Sandoval } 669a5ed9182SOmar Sandoval 670a5ed9182SOmar Sandoval next_bit = free_space_test_bit(block_group, path, end); 671a5ed9182SOmar Sandoval } else { 672a5ed9182SOmar Sandoval next_bit = -1; 673a5ed9182SOmar Sandoval } 674a5ed9182SOmar Sandoval 675a5ed9182SOmar Sandoval if (remove) { 676a5ed9182SOmar Sandoval new_extents = -1; 677a5ed9182SOmar Sandoval if (prev_bit == 1) { 678a5ed9182SOmar Sandoval /* Leftover on the left. */ 679a5ed9182SOmar Sandoval new_extents++; 680a5ed9182SOmar Sandoval } 681a5ed9182SOmar Sandoval if (next_bit == 1) { 682a5ed9182SOmar Sandoval /* Leftover on the right. */ 683a5ed9182SOmar Sandoval new_extents++; 684a5ed9182SOmar Sandoval } 685a5ed9182SOmar Sandoval } else { 686a5ed9182SOmar Sandoval new_extents = 1; 687a5ed9182SOmar Sandoval if (prev_bit == 1) { 688a5ed9182SOmar Sandoval /* Merging with neighbor on the left. */ 689a5ed9182SOmar Sandoval new_extents--; 690a5ed9182SOmar Sandoval } 691a5ed9182SOmar Sandoval if (next_bit == 1) { 692a5ed9182SOmar Sandoval /* Merging with neighbor on the right. */ 693a5ed9182SOmar Sandoval new_extents--; 694a5ed9182SOmar Sandoval } 695a5ed9182SOmar Sandoval } 696a5ed9182SOmar Sandoval 697a5ed9182SOmar Sandoval btrfs_release_path(path); 698a5ed9182SOmar Sandoval ret = update_free_space_extent_count(trans, fs_info, block_group, path, 699a5ed9182SOmar Sandoval new_extents); 700a5ed9182SOmar Sandoval 701a5ed9182SOmar Sandoval out: 702a5ed9182SOmar Sandoval return ret; 703a5ed9182SOmar Sandoval } 704a5ed9182SOmar Sandoval 705a5ed9182SOmar Sandoval static int remove_free_space_extent(struct btrfs_trans_handle *trans, 706a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info, 707a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group, 708a5ed9182SOmar Sandoval struct btrfs_path *path, 709a5ed9182SOmar Sandoval u64 start, u64 size) 710a5ed9182SOmar Sandoval { 711a5ed9182SOmar Sandoval struct btrfs_root *root = fs_info->free_space_root; 712a5ed9182SOmar Sandoval struct btrfs_key key; 713a5ed9182SOmar Sandoval u64 found_start, found_end; 714a5ed9182SOmar Sandoval u64 end = start + size; 715a5ed9182SOmar Sandoval int new_extents = -1; 716a5ed9182SOmar Sandoval int ret; 717a5ed9182SOmar Sandoval 718a5ed9182SOmar Sandoval key.objectid = start; 719a5ed9182SOmar Sandoval key.type = (u8)-1; 720a5ed9182SOmar Sandoval key.offset = (u64)-1; 721a5ed9182SOmar Sandoval 722a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 723a5ed9182SOmar Sandoval if (ret) 724a5ed9182SOmar Sandoval goto out; 725a5ed9182SOmar Sandoval 726a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 727a5ed9182SOmar Sandoval 728a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_EXTENT_KEY); 729a5ed9182SOmar Sandoval 730a5ed9182SOmar Sandoval found_start = key.objectid; 731a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 732a5ed9182SOmar Sandoval ASSERT(start >= found_start && end <= found_end); 733a5ed9182SOmar Sandoval 734a5ed9182SOmar Sandoval /* 735a5ed9182SOmar Sandoval * Okay, now that we've found the free space extent which contains the 736a5ed9182SOmar Sandoval * free space that we are removing, there are four cases: 737a5ed9182SOmar Sandoval * 738a5ed9182SOmar Sandoval * 1. We're using the whole extent: delete the key we found and 739a5ed9182SOmar Sandoval * decrement the free space extent count. 740a5ed9182SOmar Sandoval * 2. We are using part of the extent starting at the beginning: delete 741a5ed9182SOmar Sandoval * the key we found and insert a new key representing the leftover at 742a5ed9182SOmar Sandoval * the end. There is no net change in the number of extents. 743a5ed9182SOmar Sandoval * 3. We are using part of the extent ending at the end: delete the key 744a5ed9182SOmar Sandoval * we found and insert a new key representing the leftover at the 745a5ed9182SOmar Sandoval * beginning. There is no net change in the number of extents. 746a5ed9182SOmar Sandoval * 4. We are using part of the extent in the middle: delete the key we 747a5ed9182SOmar Sandoval * found and insert two new keys representing the leftovers on each 748a5ed9182SOmar Sandoval * side. Where we used to have one extent, we now have two, so increment 749a5ed9182SOmar Sandoval * the extent count. We may need to convert the block group to bitmaps 750a5ed9182SOmar Sandoval * as a result. 751a5ed9182SOmar Sandoval */ 752a5ed9182SOmar Sandoval 753a5ed9182SOmar Sandoval /* Delete the existing key (cases 1-4). */ 754a5ed9182SOmar Sandoval ret = btrfs_del_item(trans, root, path); 755a5ed9182SOmar Sandoval if (ret) 756a5ed9182SOmar Sandoval goto out; 757a5ed9182SOmar Sandoval 758a5ed9182SOmar Sandoval /* Add a key for leftovers at the beginning (cases 3 and 4). */ 759a5ed9182SOmar Sandoval if (start > found_start) { 760a5ed9182SOmar Sandoval key.objectid = found_start; 761a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_EXTENT_KEY; 762a5ed9182SOmar Sandoval key.offset = start - found_start; 763a5ed9182SOmar Sandoval 764a5ed9182SOmar Sandoval btrfs_release_path(path); 765a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, 0); 766a5ed9182SOmar Sandoval if (ret) 767a5ed9182SOmar Sandoval goto out; 768a5ed9182SOmar Sandoval new_extents++; 769a5ed9182SOmar Sandoval } 770a5ed9182SOmar Sandoval 771a5ed9182SOmar Sandoval /* Add a key for leftovers at the end (cases 2 and 4). */ 772a5ed9182SOmar Sandoval if (end < found_end) { 773a5ed9182SOmar Sandoval key.objectid = end; 774a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_EXTENT_KEY; 775a5ed9182SOmar Sandoval key.offset = found_end - end; 776a5ed9182SOmar Sandoval 777a5ed9182SOmar Sandoval btrfs_release_path(path); 778a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, 0); 779a5ed9182SOmar Sandoval if (ret) 780a5ed9182SOmar Sandoval goto out; 781a5ed9182SOmar Sandoval new_extents++; 782a5ed9182SOmar Sandoval } 783a5ed9182SOmar Sandoval 784a5ed9182SOmar Sandoval btrfs_release_path(path); 785a5ed9182SOmar Sandoval ret = update_free_space_extent_count(trans, fs_info, block_group, path, 786a5ed9182SOmar Sandoval new_extents); 787a5ed9182SOmar Sandoval 788a5ed9182SOmar Sandoval out: 789a5ed9182SOmar Sandoval return ret; 790a5ed9182SOmar Sandoval } 791a5ed9182SOmar Sandoval 792a5ed9182SOmar Sandoval int __remove_from_free_space_tree(struct btrfs_trans_handle *trans, 793a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info, 794a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group, 795a5ed9182SOmar Sandoval struct btrfs_path *path, u64 start, u64 size) 796a5ed9182SOmar Sandoval { 797a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 798a5ed9182SOmar Sandoval u32 flags; 799a5ed9182SOmar Sandoval int ret; 800a5ed9182SOmar Sandoval 801a5ed9182SOmar Sandoval if (block_group->needs_free_space) { 802a5ed9182SOmar Sandoval ret = __add_block_group_free_space(trans, fs_info, block_group, 803a5ed9182SOmar Sandoval path); 804a5ed9182SOmar Sandoval if (ret) 805a5ed9182SOmar Sandoval return ret; 806a5ed9182SOmar Sandoval } 807a5ed9182SOmar Sandoval 808a5ed9182SOmar Sandoval info = search_free_space_info(NULL, fs_info, block_group, path, 0); 809a5ed9182SOmar Sandoval if (IS_ERR(info)) 810a5ed9182SOmar Sandoval return PTR_ERR(info); 811a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(path->nodes[0], info); 812a5ed9182SOmar Sandoval btrfs_release_path(path); 813a5ed9182SOmar Sandoval 814a5ed9182SOmar Sandoval if (flags & BTRFS_FREE_SPACE_USING_BITMAPS) { 815a5ed9182SOmar Sandoval return modify_free_space_bitmap(trans, fs_info, block_group, 816a5ed9182SOmar Sandoval path, start, size, 1); 817a5ed9182SOmar Sandoval } else { 818a5ed9182SOmar Sandoval return remove_free_space_extent(trans, fs_info, block_group, 819a5ed9182SOmar Sandoval path, start, size); 820a5ed9182SOmar Sandoval } 821a5ed9182SOmar Sandoval } 822a5ed9182SOmar Sandoval 823a5ed9182SOmar Sandoval int remove_from_free_space_tree(struct btrfs_trans_handle *trans, 824a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info, 825a5ed9182SOmar Sandoval u64 start, u64 size) 826a5ed9182SOmar Sandoval { 827a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group; 828a5ed9182SOmar Sandoval struct btrfs_path *path; 829a5ed9182SOmar Sandoval int ret; 830a5ed9182SOmar Sandoval 831a5ed9182SOmar Sandoval if (!btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) 832a5ed9182SOmar Sandoval return 0; 833a5ed9182SOmar Sandoval 834a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 835a5ed9182SOmar Sandoval if (!path) { 836a5ed9182SOmar Sandoval ret = -ENOMEM; 837a5ed9182SOmar Sandoval goto out; 838a5ed9182SOmar Sandoval } 839a5ed9182SOmar Sandoval 840a5ed9182SOmar Sandoval block_group = btrfs_lookup_block_group(fs_info, start); 841a5ed9182SOmar Sandoval if (!block_group) { 842a5ed9182SOmar Sandoval ASSERT(0); 843a5ed9182SOmar Sandoval ret = -ENOENT; 844a5ed9182SOmar Sandoval goto out; 845a5ed9182SOmar Sandoval } 846a5ed9182SOmar Sandoval 847a5ed9182SOmar Sandoval mutex_lock(&block_group->free_space_lock); 848a5ed9182SOmar Sandoval ret = __remove_from_free_space_tree(trans, fs_info, block_group, path, 849a5ed9182SOmar Sandoval start, size); 850a5ed9182SOmar Sandoval mutex_unlock(&block_group->free_space_lock); 851a5ed9182SOmar Sandoval 852a5ed9182SOmar Sandoval btrfs_put_block_group(block_group); 853a5ed9182SOmar Sandoval out: 854a5ed9182SOmar Sandoval btrfs_free_path(path); 855a5ed9182SOmar Sandoval if (ret) 85666642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 857a5ed9182SOmar Sandoval return ret; 858a5ed9182SOmar Sandoval } 859a5ed9182SOmar Sandoval 860a5ed9182SOmar Sandoval static int add_free_space_extent(struct btrfs_trans_handle *trans, 861a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info, 862a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group, 863a5ed9182SOmar Sandoval struct btrfs_path *path, 864a5ed9182SOmar Sandoval u64 start, u64 size) 865a5ed9182SOmar Sandoval { 866a5ed9182SOmar Sandoval struct btrfs_root *root = fs_info->free_space_root; 867a5ed9182SOmar Sandoval struct btrfs_key key, new_key; 868a5ed9182SOmar Sandoval u64 found_start, found_end; 869a5ed9182SOmar Sandoval u64 end = start + size; 870a5ed9182SOmar Sandoval int new_extents = 1; 871a5ed9182SOmar Sandoval int ret; 872a5ed9182SOmar Sandoval 873a5ed9182SOmar Sandoval /* 874a5ed9182SOmar Sandoval * We are adding a new extent of free space, but we need to merge 875a5ed9182SOmar Sandoval * extents. There are four cases here: 876a5ed9182SOmar Sandoval * 877a5ed9182SOmar Sandoval * 1. The new extent does not have any immediate neighbors to merge 878a5ed9182SOmar Sandoval * with: add the new key and increment the free space extent count. We 879a5ed9182SOmar Sandoval * may need to convert the block group to bitmaps as a result. 880a5ed9182SOmar Sandoval * 2. The new extent has an immediate neighbor before it: remove the 881a5ed9182SOmar Sandoval * previous key and insert a new key combining both of them. There is no 882a5ed9182SOmar Sandoval * net change in the number of extents. 883a5ed9182SOmar Sandoval * 3. The new extent has an immediate neighbor after it: remove the next 884a5ed9182SOmar Sandoval * key and insert a new key combining both of them. There is no net 885a5ed9182SOmar Sandoval * change in the number of extents. 886a5ed9182SOmar Sandoval * 4. The new extent has immediate neighbors on both sides: remove both 887a5ed9182SOmar Sandoval * of the keys and insert a new key combining all of them. Where we used 888a5ed9182SOmar Sandoval * to have two extents, we now have one, so decrement the extent count. 889a5ed9182SOmar Sandoval */ 890a5ed9182SOmar Sandoval 891a5ed9182SOmar Sandoval new_key.objectid = start; 892a5ed9182SOmar Sandoval new_key.type = BTRFS_FREE_SPACE_EXTENT_KEY; 893a5ed9182SOmar Sandoval new_key.offset = size; 894a5ed9182SOmar Sandoval 895a5ed9182SOmar Sandoval /* Search for a neighbor on the left. */ 896a5ed9182SOmar Sandoval if (start == block_group->key.objectid) 897a5ed9182SOmar Sandoval goto right; 898a5ed9182SOmar Sandoval key.objectid = start - 1; 899a5ed9182SOmar Sandoval key.type = (u8)-1; 900a5ed9182SOmar Sandoval key.offset = (u64)-1; 901a5ed9182SOmar Sandoval 902a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 903a5ed9182SOmar Sandoval if (ret) 904a5ed9182SOmar Sandoval goto out; 905a5ed9182SOmar Sandoval 906a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 907a5ed9182SOmar Sandoval 908a5ed9182SOmar Sandoval if (key.type != BTRFS_FREE_SPACE_EXTENT_KEY) { 909a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_INFO_KEY); 910a5ed9182SOmar Sandoval btrfs_release_path(path); 911a5ed9182SOmar Sandoval goto right; 912a5ed9182SOmar Sandoval } 913a5ed9182SOmar Sandoval 914a5ed9182SOmar Sandoval found_start = key.objectid; 915a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 916a5ed9182SOmar Sandoval ASSERT(found_start >= block_group->key.objectid && 917a5ed9182SOmar Sandoval found_end > block_group->key.objectid); 918a5ed9182SOmar Sandoval ASSERT(found_start < start && found_end <= start); 919a5ed9182SOmar Sandoval 920a5ed9182SOmar Sandoval /* 921a5ed9182SOmar Sandoval * Delete the neighbor on the left and absorb it into the new key (cases 922a5ed9182SOmar Sandoval * 2 and 4). 923a5ed9182SOmar Sandoval */ 924a5ed9182SOmar Sandoval if (found_end == start) { 925a5ed9182SOmar Sandoval ret = btrfs_del_item(trans, root, path); 926a5ed9182SOmar Sandoval if (ret) 927a5ed9182SOmar Sandoval goto out; 928a5ed9182SOmar Sandoval new_key.objectid = found_start; 929a5ed9182SOmar Sandoval new_key.offset += key.offset; 930a5ed9182SOmar Sandoval new_extents--; 931a5ed9182SOmar Sandoval } 932a5ed9182SOmar Sandoval btrfs_release_path(path); 933a5ed9182SOmar Sandoval 934a5ed9182SOmar Sandoval right: 935a5ed9182SOmar Sandoval /* Search for a neighbor on the right. */ 936a5ed9182SOmar Sandoval if (end == block_group->key.objectid + block_group->key.offset) 937a5ed9182SOmar Sandoval goto insert; 938a5ed9182SOmar Sandoval key.objectid = end; 939a5ed9182SOmar Sandoval key.type = (u8)-1; 940a5ed9182SOmar Sandoval key.offset = (u64)-1; 941a5ed9182SOmar Sandoval 942a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 943a5ed9182SOmar Sandoval if (ret) 944a5ed9182SOmar Sandoval goto out; 945a5ed9182SOmar Sandoval 946a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 947a5ed9182SOmar Sandoval 948a5ed9182SOmar Sandoval if (key.type != BTRFS_FREE_SPACE_EXTENT_KEY) { 949a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_INFO_KEY); 950a5ed9182SOmar Sandoval btrfs_release_path(path); 951a5ed9182SOmar Sandoval goto insert; 952a5ed9182SOmar Sandoval } 953a5ed9182SOmar Sandoval 954a5ed9182SOmar Sandoval found_start = key.objectid; 955a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 956a5ed9182SOmar Sandoval ASSERT(found_start >= block_group->key.objectid && 957a5ed9182SOmar Sandoval found_end > block_group->key.objectid); 958a5ed9182SOmar Sandoval ASSERT((found_start < start && found_end <= start) || 959a5ed9182SOmar Sandoval (found_start >= end && found_end > end)); 960a5ed9182SOmar Sandoval 961a5ed9182SOmar Sandoval /* 962a5ed9182SOmar Sandoval * Delete the neighbor on the right and absorb it into the new key 963a5ed9182SOmar Sandoval * (cases 3 and 4). 964a5ed9182SOmar Sandoval */ 965a5ed9182SOmar Sandoval if (found_start == end) { 966a5ed9182SOmar Sandoval ret = btrfs_del_item(trans, root, path); 967a5ed9182SOmar Sandoval if (ret) 968a5ed9182SOmar Sandoval goto out; 969a5ed9182SOmar Sandoval new_key.offset += key.offset; 970a5ed9182SOmar Sandoval new_extents--; 971a5ed9182SOmar Sandoval } 972a5ed9182SOmar Sandoval btrfs_release_path(path); 973a5ed9182SOmar Sandoval 974a5ed9182SOmar Sandoval insert: 975a5ed9182SOmar Sandoval /* Insert the new key (cases 1-4). */ 976a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &new_key, 0); 977a5ed9182SOmar Sandoval if (ret) 978a5ed9182SOmar Sandoval goto out; 979a5ed9182SOmar Sandoval 980a5ed9182SOmar Sandoval btrfs_release_path(path); 981a5ed9182SOmar Sandoval ret = update_free_space_extent_count(trans, fs_info, block_group, path, 982a5ed9182SOmar Sandoval new_extents); 983a5ed9182SOmar Sandoval 984a5ed9182SOmar Sandoval out: 985a5ed9182SOmar Sandoval return ret; 986a5ed9182SOmar Sandoval } 987a5ed9182SOmar Sandoval 988a5ed9182SOmar Sandoval int __add_to_free_space_tree(struct btrfs_trans_handle *trans, 989a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info, 990a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group, 991a5ed9182SOmar Sandoval struct btrfs_path *path, u64 start, u64 size) 992a5ed9182SOmar Sandoval { 993a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 994a5ed9182SOmar Sandoval u32 flags; 995a5ed9182SOmar Sandoval int ret; 996a5ed9182SOmar Sandoval 997a5ed9182SOmar Sandoval if (block_group->needs_free_space) { 998a5ed9182SOmar Sandoval ret = __add_block_group_free_space(trans, fs_info, block_group, 999a5ed9182SOmar Sandoval path); 1000a5ed9182SOmar Sandoval if (ret) 1001a5ed9182SOmar Sandoval return ret; 1002a5ed9182SOmar Sandoval } 1003a5ed9182SOmar Sandoval 1004a5ed9182SOmar Sandoval info = search_free_space_info(NULL, fs_info, block_group, path, 0); 1005a5ed9182SOmar Sandoval if (IS_ERR(info)) 1006a5ed9182SOmar Sandoval return PTR_ERR(info); 1007a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(path->nodes[0], info); 1008a5ed9182SOmar Sandoval btrfs_release_path(path); 1009a5ed9182SOmar Sandoval 1010a5ed9182SOmar Sandoval if (flags & BTRFS_FREE_SPACE_USING_BITMAPS) { 1011a5ed9182SOmar Sandoval return modify_free_space_bitmap(trans, fs_info, block_group, 1012a5ed9182SOmar Sandoval path, start, size, 0); 1013a5ed9182SOmar Sandoval } else { 1014a5ed9182SOmar Sandoval return add_free_space_extent(trans, fs_info, block_group, path, 1015a5ed9182SOmar Sandoval start, size); 1016a5ed9182SOmar Sandoval } 1017a5ed9182SOmar Sandoval } 1018a5ed9182SOmar Sandoval 1019a5ed9182SOmar Sandoval int add_to_free_space_tree(struct btrfs_trans_handle *trans, 1020a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info, 1021a5ed9182SOmar Sandoval u64 start, u64 size) 1022a5ed9182SOmar Sandoval { 1023a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group; 1024a5ed9182SOmar Sandoval struct btrfs_path *path; 1025a5ed9182SOmar Sandoval int ret; 1026a5ed9182SOmar Sandoval 1027a5ed9182SOmar Sandoval if (!btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) 1028a5ed9182SOmar Sandoval return 0; 1029a5ed9182SOmar Sandoval 1030a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1031a5ed9182SOmar Sandoval if (!path) { 1032a5ed9182SOmar Sandoval ret = -ENOMEM; 1033a5ed9182SOmar Sandoval goto out; 1034a5ed9182SOmar Sandoval } 1035a5ed9182SOmar Sandoval 1036a5ed9182SOmar Sandoval block_group = btrfs_lookup_block_group(fs_info, start); 1037a5ed9182SOmar Sandoval if (!block_group) { 1038a5ed9182SOmar Sandoval ASSERT(0); 1039a5ed9182SOmar Sandoval ret = -ENOENT; 1040a5ed9182SOmar Sandoval goto out; 1041a5ed9182SOmar Sandoval } 1042a5ed9182SOmar Sandoval 1043a5ed9182SOmar Sandoval mutex_lock(&block_group->free_space_lock); 1044a5ed9182SOmar Sandoval ret = __add_to_free_space_tree(trans, fs_info, block_group, path, start, 1045a5ed9182SOmar Sandoval size); 1046a5ed9182SOmar Sandoval mutex_unlock(&block_group->free_space_lock); 1047a5ed9182SOmar Sandoval 1048a5ed9182SOmar Sandoval btrfs_put_block_group(block_group); 1049a5ed9182SOmar Sandoval out: 1050a5ed9182SOmar Sandoval btrfs_free_path(path); 1051a5ed9182SOmar Sandoval if (ret) 105266642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 1053a5ed9182SOmar Sandoval return ret; 1054a5ed9182SOmar Sandoval } 1055a5ed9182SOmar Sandoval 1056a5ed9182SOmar Sandoval /* 1057a5ed9182SOmar Sandoval * Populate the free space tree by walking the extent tree. Operations on the 1058a5ed9182SOmar Sandoval * extent tree that happen as a result of writes to the free space tree will go 1059a5ed9182SOmar Sandoval * through the normal add/remove hooks. 1060a5ed9182SOmar Sandoval */ 1061a5ed9182SOmar Sandoval static int populate_free_space_tree(struct btrfs_trans_handle *trans, 1062a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info, 1063a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group) 1064a5ed9182SOmar Sandoval { 1065a5ed9182SOmar Sandoval struct btrfs_root *extent_root = fs_info->extent_root; 1066a5ed9182SOmar Sandoval struct btrfs_path *path, *path2; 1067a5ed9182SOmar Sandoval struct btrfs_key key; 1068a5ed9182SOmar Sandoval u64 start, end; 1069a5ed9182SOmar Sandoval int ret; 1070a5ed9182SOmar Sandoval 1071a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1072a5ed9182SOmar Sandoval if (!path) 1073a5ed9182SOmar Sandoval return -ENOMEM; 1074019599adSGu Jinxiang path->reada = READA_FORWARD; 1075a5ed9182SOmar Sandoval 1076a5ed9182SOmar Sandoval path2 = btrfs_alloc_path(); 1077a5ed9182SOmar Sandoval if (!path2) { 1078a5ed9182SOmar Sandoval btrfs_free_path(path); 1079a5ed9182SOmar Sandoval return -ENOMEM; 1080a5ed9182SOmar Sandoval } 1081a5ed9182SOmar Sandoval 1082a5ed9182SOmar Sandoval ret = add_new_free_space_info(trans, fs_info, block_group, path2); 1083a5ed9182SOmar Sandoval if (ret) 1084a5ed9182SOmar Sandoval goto out; 1085a5ed9182SOmar Sandoval 1086511711afSChris Mason mutex_lock(&block_group->free_space_lock); 1087511711afSChris Mason 1088a5ed9182SOmar Sandoval /* 1089a5ed9182SOmar Sandoval * Iterate through all of the extent and metadata items in this block 1090a5ed9182SOmar Sandoval * group, adding the free space between them and the free space at the 1091a5ed9182SOmar Sandoval * end. Note that EXTENT_ITEM and METADATA_ITEM are less than 1092a5ed9182SOmar Sandoval * BLOCK_GROUP_ITEM, so an extent may precede the block group that it's 1093a5ed9182SOmar Sandoval * contained in. 1094a5ed9182SOmar Sandoval */ 1095a5ed9182SOmar Sandoval key.objectid = block_group->key.objectid; 1096a5ed9182SOmar Sandoval key.type = BTRFS_EXTENT_ITEM_KEY; 1097a5ed9182SOmar Sandoval key.offset = 0; 1098a5ed9182SOmar Sandoval 1099a5ed9182SOmar Sandoval ret = btrfs_search_slot_for_read(extent_root, &key, path, 1, 0); 1100a5ed9182SOmar Sandoval if (ret < 0) 1101511711afSChris Mason goto out_locked; 1102a5ed9182SOmar Sandoval ASSERT(ret == 0); 1103a5ed9182SOmar Sandoval 1104a5ed9182SOmar Sandoval start = block_group->key.objectid; 1105a5ed9182SOmar Sandoval end = block_group->key.objectid + block_group->key.offset; 1106a5ed9182SOmar Sandoval while (1) { 1107a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 1108a5ed9182SOmar Sandoval 1109a5ed9182SOmar Sandoval if (key.type == BTRFS_EXTENT_ITEM_KEY || 1110a5ed9182SOmar Sandoval key.type == BTRFS_METADATA_ITEM_KEY) { 1111a5ed9182SOmar Sandoval if (key.objectid >= end) 1112a5ed9182SOmar Sandoval break; 1113a5ed9182SOmar Sandoval 1114a5ed9182SOmar Sandoval if (start < key.objectid) { 1115a5ed9182SOmar Sandoval ret = __add_to_free_space_tree(trans, fs_info, 1116a5ed9182SOmar Sandoval block_group, 1117a5ed9182SOmar Sandoval path2, start, 1118a5ed9182SOmar Sandoval key.objectid - 1119a5ed9182SOmar Sandoval start); 1120a5ed9182SOmar Sandoval if (ret) 1121511711afSChris Mason goto out_locked; 1122a5ed9182SOmar Sandoval } 1123a5ed9182SOmar Sandoval start = key.objectid; 1124a5ed9182SOmar Sandoval if (key.type == BTRFS_METADATA_ITEM_KEY) 1125da17066cSJeff Mahoney start += fs_info->nodesize; 1126a5ed9182SOmar Sandoval else 1127a5ed9182SOmar Sandoval start += key.offset; 1128a5ed9182SOmar Sandoval } else if (key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { 1129a5ed9182SOmar Sandoval if (key.objectid != block_group->key.objectid) 1130a5ed9182SOmar Sandoval break; 1131a5ed9182SOmar Sandoval } 1132a5ed9182SOmar Sandoval 1133a5ed9182SOmar Sandoval ret = btrfs_next_item(extent_root, path); 1134a5ed9182SOmar Sandoval if (ret < 0) 1135511711afSChris Mason goto out_locked; 1136a5ed9182SOmar Sandoval if (ret) 1137a5ed9182SOmar Sandoval break; 1138a5ed9182SOmar Sandoval } 1139a5ed9182SOmar Sandoval if (start < end) { 1140a5ed9182SOmar Sandoval ret = __add_to_free_space_tree(trans, fs_info, block_group, 1141a5ed9182SOmar Sandoval path2, start, end - start); 1142a5ed9182SOmar Sandoval if (ret) 1143511711afSChris Mason goto out_locked; 1144a5ed9182SOmar Sandoval } 1145a5ed9182SOmar Sandoval 1146a5ed9182SOmar Sandoval ret = 0; 1147511711afSChris Mason out_locked: 1148511711afSChris Mason mutex_unlock(&block_group->free_space_lock); 1149a5ed9182SOmar Sandoval out: 1150a5ed9182SOmar Sandoval btrfs_free_path(path2); 1151a5ed9182SOmar Sandoval btrfs_free_path(path); 1152a5ed9182SOmar Sandoval return ret; 1153a5ed9182SOmar Sandoval } 1154a5ed9182SOmar Sandoval 1155a5ed9182SOmar Sandoval int btrfs_create_free_space_tree(struct btrfs_fs_info *fs_info) 1156a5ed9182SOmar Sandoval { 1157a5ed9182SOmar Sandoval struct btrfs_trans_handle *trans; 1158a5ed9182SOmar Sandoval struct btrfs_root *tree_root = fs_info->tree_root; 1159a5ed9182SOmar Sandoval struct btrfs_root *free_space_root; 1160a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group; 1161a5ed9182SOmar Sandoval struct rb_node *node; 1162a5ed9182SOmar Sandoval int ret; 1163a5ed9182SOmar Sandoval 1164a5ed9182SOmar Sandoval trans = btrfs_start_transaction(tree_root, 0); 1165a5ed9182SOmar Sandoval if (IS_ERR(trans)) 1166a5ed9182SOmar Sandoval return PTR_ERR(trans); 1167a5ed9182SOmar Sandoval 1168afcdd129SJosef Bacik set_bit(BTRFS_FS_CREATING_FREE_SPACE_TREE, &fs_info->flags); 1169a5ed9182SOmar Sandoval free_space_root = btrfs_create_tree(trans, fs_info, 1170a5ed9182SOmar Sandoval BTRFS_FREE_SPACE_TREE_OBJECTID); 1171a5ed9182SOmar Sandoval if (IS_ERR(free_space_root)) { 1172a5ed9182SOmar Sandoval ret = PTR_ERR(free_space_root); 1173a5ed9182SOmar Sandoval goto abort; 1174a5ed9182SOmar Sandoval } 1175a5ed9182SOmar Sandoval fs_info->free_space_root = free_space_root; 1176a5ed9182SOmar Sandoval 1177a5ed9182SOmar Sandoval node = rb_first(&fs_info->block_group_cache_tree); 1178a5ed9182SOmar Sandoval while (node) { 1179a5ed9182SOmar Sandoval block_group = rb_entry(node, struct btrfs_block_group_cache, 1180a5ed9182SOmar Sandoval cache_node); 1181a5ed9182SOmar Sandoval ret = populate_free_space_tree(trans, fs_info, block_group); 1182a5ed9182SOmar Sandoval if (ret) 1183a5ed9182SOmar Sandoval goto abort; 1184a5ed9182SOmar Sandoval node = rb_next(node); 1185a5ed9182SOmar Sandoval } 1186a5ed9182SOmar Sandoval 1187a5ed9182SOmar Sandoval btrfs_set_fs_compat_ro(fs_info, FREE_SPACE_TREE); 11886675df31SOmar Sandoval btrfs_set_fs_compat_ro(fs_info, FREE_SPACE_TREE_VALID); 1189afcdd129SJosef Bacik clear_bit(BTRFS_FS_CREATING_FREE_SPACE_TREE, &fs_info->flags); 1190a5ed9182SOmar Sandoval 11910bef7109SSahil Kang return btrfs_commit_transaction(trans); 1192a5ed9182SOmar Sandoval 1193a5ed9182SOmar Sandoval abort: 1194afcdd129SJosef Bacik clear_bit(BTRFS_FS_CREATING_FREE_SPACE_TREE, &fs_info->flags); 119566642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 11963a45bb20SJeff Mahoney btrfs_end_transaction(trans); 1197a5ed9182SOmar Sandoval return ret; 1198a5ed9182SOmar Sandoval } 1199a5ed9182SOmar Sandoval 1200a5ed9182SOmar Sandoval static int clear_free_space_tree(struct btrfs_trans_handle *trans, 1201a5ed9182SOmar Sandoval struct btrfs_root *root) 1202a5ed9182SOmar Sandoval { 1203a5ed9182SOmar Sandoval struct btrfs_path *path; 1204a5ed9182SOmar Sandoval struct btrfs_key key; 1205a5ed9182SOmar Sandoval int nr; 1206a5ed9182SOmar Sandoval int ret; 1207a5ed9182SOmar Sandoval 1208a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1209a5ed9182SOmar Sandoval if (!path) 1210a5ed9182SOmar Sandoval return -ENOMEM; 1211a5ed9182SOmar Sandoval 1212a5ed9182SOmar Sandoval path->leave_spinning = 1; 1213a5ed9182SOmar Sandoval 1214a5ed9182SOmar Sandoval key.objectid = 0; 1215a5ed9182SOmar Sandoval key.type = 0; 1216a5ed9182SOmar Sandoval key.offset = 0; 1217a5ed9182SOmar Sandoval 1218a5ed9182SOmar Sandoval while (1) { 1219a5ed9182SOmar Sandoval ret = btrfs_search_slot(trans, root, &key, path, -1, 1); 1220a5ed9182SOmar Sandoval if (ret < 0) 1221a5ed9182SOmar Sandoval goto out; 1222a5ed9182SOmar Sandoval 1223a5ed9182SOmar Sandoval nr = btrfs_header_nritems(path->nodes[0]); 1224a5ed9182SOmar Sandoval if (!nr) 1225a5ed9182SOmar Sandoval break; 1226a5ed9182SOmar Sandoval 1227a5ed9182SOmar Sandoval path->slots[0] = 0; 1228a5ed9182SOmar Sandoval ret = btrfs_del_items(trans, root, path, 0, nr); 1229a5ed9182SOmar Sandoval if (ret) 1230a5ed9182SOmar Sandoval goto out; 1231a5ed9182SOmar Sandoval 1232a5ed9182SOmar Sandoval btrfs_release_path(path); 1233a5ed9182SOmar Sandoval } 1234a5ed9182SOmar Sandoval 1235a5ed9182SOmar Sandoval ret = 0; 1236a5ed9182SOmar Sandoval out: 1237a5ed9182SOmar Sandoval btrfs_free_path(path); 1238a5ed9182SOmar Sandoval return ret; 1239a5ed9182SOmar Sandoval } 1240a5ed9182SOmar Sandoval 1241a5ed9182SOmar Sandoval int btrfs_clear_free_space_tree(struct btrfs_fs_info *fs_info) 1242a5ed9182SOmar Sandoval { 1243a5ed9182SOmar Sandoval struct btrfs_trans_handle *trans; 1244a5ed9182SOmar Sandoval struct btrfs_root *tree_root = fs_info->tree_root; 1245a5ed9182SOmar Sandoval struct btrfs_root *free_space_root = fs_info->free_space_root; 1246a5ed9182SOmar Sandoval int ret; 1247a5ed9182SOmar Sandoval 1248a5ed9182SOmar Sandoval trans = btrfs_start_transaction(tree_root, 0); 1249a5ed9182SOmar Sandoval if (IS_ERR(trans)) 1250a5ed9182SOmar Sandoval return PTR_ERR(trans); 1251a5ed9182SOmar Sandoval 1252a5ed9182SOmar Sandoval btrfs_clear_fs_compat_ro(fs_info, FREE_SPACE_TREE); 12536675df31SOmar Sandoval btrfs_clear_fs_compat_ro(fs_info, FREE_SPACE_TREE_VALID); 1254a5ed9182SOmar Sandoval fs_info->free_space_root = NULL; 1255a5ed9182SOmar Sandoval 1256a5ed9182SOmar Sandoval ret = clear_free_space_tree(trans, free_space_root); 1257a5ed9182SOmar Sandoval if (ret) 1258a5ed9182SOmar Sandoval goto abort; 1259a5ed9182SOmar Sandoval 12601cd5447eSJeff Mahoney ret = btrfs_del_root(trans, fs_info, &free_space_root->root_key); 1261a5ed9182SOmar Sandoval if (ret) 1262a5ed9182SOmar Sandoval goto abort; 1263a5ed9182SOmar Sandoval 1264a5ed9182SOmar Sandoval list_del(&free_space_root->dirty_list); 1265a5ed9182SOmar Sandoval 1266a5ed9182SOmar Sandoval btrfs_tree_lock(free_space_root->node); 12677c302b49SDavid Sterba clean_tree_block(fs_info, free_space_root->node); 1268a5ed9182SOmar Sandoval btrfs_tree_unlock(free_space_root->node); 1269a5ed9182SOmar Sandoval btrfs_free_tree_block(trans, free_space_root, free_space_root->node, 1270a5ed9182SOmar Sandoval 0, 1); 1271a5ed9182SOmar Sandoval 1272a5ed9182SOmar Sandoval free_extent_buffer(free_space_root->node); 1273a5ed9182SOmar Sandoval free_extent_buffer(free_space_root->commit_root); 1274a5ed9182SOmar Sandoval kfree(free_space_root); 1275a5ed9182SOmar Sandoval 12760bef7109SSahil Kang return btrfs_commit_transaction(trans); 1277a5ed9182SOmar Sandoval 1278a5ed9182SOmar Sandoval abort: 127966642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 12803a45bb20SJeff Mahoney btrfs_end_transaction(trans); 1281a5ed9182SOmar Sandoval return ret; 1282a5ed9182SOmar Sandoval } 1283a5ed9182SOmar Sandoval 1284a5ed9182SOmar Sandoval static int __add_block_group_free_space(struct btrfs_trans_handle *trans, 1285a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info, 1286a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group, 1287a5ed9182SOmar Sandoval struct btrfs_path *path) 1288a5ed9182SOmar Sandoval { 1289a5ed9182SOmar Sandoval int ret; 1290a5ed9182SOmar Sandoval 1291a5ed9182SOmar Sandoval block_group->needs_free_space = 0; 1292a5ed9182SOmar Sandoval 1293a5ed9182SOmar Sandoval ret = add_new_free_space_info(trans, fs_info, block_group, path); 1294a5ed9182SOmar Sandoval if (ret) 1295a5ed9182SOmar Sandoval return ret; 1296a5ed9182SOmar Sandoval 1297a5ed9182SOmar Sandoval return __add_to_free_space_tree(trans, fs_info, block_group, path, 1298a5ed9182SOmar Sandoval block_group->key.objectid, 1299a5ed9182SOmar Sandoval block_group->key.offset); 1300a5ed9182SOmar Sandoval } 1301a5ed9182SOmar Sandoval 1302a5ed9182SOmar Sandoval int add_block_group_free_space(struct btrfs_trans_handle *trans, 1303a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info, 1304a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group) 1305a5ed9182SOmar Sandoval { 1306a5ed9182SOmar Sandoval struct btrfs_path *path = NULL; 1307a5ed9182SOmar Sandoval int ret = 0; 1308a5ed9182SOmar Sandoval 1309a5ed9182SOmar Sandoval if (!btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) 1310a5ed9182SOmar Sandoval return 0; 1311a5ed9182SOmar Sandoval 1312a5ed9182SOmar Sandoval mutex_lock(&block_group->free_space_lock); 1313a5ed9182SOmar Sandoval if (!block_group->needs_free_space) 1314a5ed9182SOmar Sandoval goto out; 1315a5ed9182SOmar Sandoval 1316a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1317a5ed9182SOmar Sandoval if (!path) { 1318a5ed9182SOmar Sandoval ret = -ENOMEM; 1319a5ed9182SOmar Sandoval goto out; 1320a5ed9182SOmar Sandoval } 1321a5ed9182SOmar Sandoval 1322a5ed9182SOmar Sandoval ret = __add_block_group_free_space(trans, fs_info, block_group, path); 1323a5ed9182SOmar Sandoval 1324a5ed9182SOmar Sandoval out: 1325a5ed9182SOmar Sandoval btrfs_free_path(path); 1326a5ed9182SOmar Sandoval mutex_unlock(&block_group->free_space_lock); 1327a5ed9182SOmar Sandoval if (ret) 132866642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 1329a5ed9182SOmar Sandoval return ret; 1330a5ed9182SOmar Sandoval } 1331a5ed9182SOmar Sandoval 1332a5ed9182SOmar Sandoval int remove_block_group_free_space(struct btrfs_trans_handle *trans, 1333a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info, 1334a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group) 1335a5ed9182SOmar Sandoval { 1336a5ed9182SOmar Sandoval struct btrfs_root *root = fs_info->free_space_root; 1337a5ed9182SOmar Sandoval struct btrfs_path *path; 1338a5ed9182SOmar Sandoval struct btrfs_key key, found_key; 1339a5ed9182SOmar Sandoval struct extent_buffer *leaf; 1340a5ed9182SOmar Sandoval u64 start, end; 1341a5ed9182SOmar Sandoval int done = 0, nr; 1342a5ed9182SOmar Sandoval int ret; 1343a5ed9182SOmar Sandoval 1344a5ed9182SOmar Sandoval if (!btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) 1345a5ed9182SOmar Sandoval return 0; 1346a5ed9182SOmar Sandoval 1347a5ed9182SOmar Sandoval if (block_group->needs_free_space) { 1348a5ed9182SOmar Sandoval /* We never added this block group to the free space tree. */ 1349a5ed9182SOmar Sandoval return 0; 1350a5ed9182SOmar Sandoval } 1351a5ed9182SOmar Sandoval 1352a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1353a5ed9182SOmar Sandoval if (!path) { 1354a5ed9182SOmar Sandoval ret = -ENOMEM; 1355a5ed9182SOmar Sandoval goto out; 1356a5ed9182SOmar Sandoval } 1357a5ed9182SOmar Sandoval 1358a5ed9182SOmar Sandoval start = block_group->key.objectid; 1359a5ed9182SOmar Sandoval end = block_group->key.objectid + block_group->key.offset; 1360a5ed9182SOmar Sandoval 1361a5ed9182SOmar Sandoval key.objectid = end - 1; 1362a5ed9182SOmar Sandoval key.type = (u8)-1; 1363a5ed9182SOmar Sandoval key.offset = (u64)-1; 1364a5ed9182SOmar Sandoval 1365a5ed9182SOmar Sandoval while (!done) { 1366a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 1367a5ed9182SOmar Sandoval if (ret) 1368a5ed9182SOmar Sandoval goto out; 1369a5ed9182SOmar Sandoval 1370a5ed9182SOmar Sandoval leaf = path->nodes[0]; 1371a5ed9182SOmar Sandoval nr = 0; 1372a5ed9182SOmar Sandoval path->slots[0]++; 1373a5ed9182SOmar Sandoval while (path->slots[0] > 0) { 1374a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0] - 1); 1375a5ed9182SOmar Sandoval 1376a5ed9182SOmar Sandoval if (found_key.type == BTRFS_FREE_SPACE_INFO_KEY) { 1377a5ed9182SOmar Sandoval ASSERT(found_key.objectid == block_group->key.objectid); 1378a5ed9182SOmar Sandoval ASSERT(found_key.offset == block_group->key.offset); 1379a5ed9182SOmar Sandoval done = 1; 1380a5ed9182SOmar Sandoval nr++; 1381a5ed9182SOmar Sandoval path->slots[0]--; 1382a5ed9182SOmar Sandoval break; 1383a5ed9182SOmar Sandoval } else if (found_key.type == BTRFS_FREE_SPACE_EXTENT_KEY || 1384a5ed9182SOmar Sandoval found_key.type == BTRFS_FREE_SPACE_BITMAP_KEY) { 1385a5ed9182SOmar Sandoval ASSERT(found_key.objectid >= start); 1386a5ed9182SOmar Sandoval ASSERT(found_key.objectid < end); 1387a5ed9182SOmar Sandoval ASSERT(found_key.objectid + found_key.offset <= end); 1388a5ed9182SOmar Sandoval nr++; 1389a5ed9182SOmar Sandoval path->slots[0]--; 1390a5ed9182SOmar Sandoval } else { 1391a5ed9182SOmar Sandoval ASSERT(0); 1392a5ed9182SOmar Sandoval } 1393a5ed9182SOmar Sandoval } 1394a5ed9182SOmar Sandoval 1395a5ed9182SOmar Sandoval ret = btrfs_del_items(trans, root, path, path->slots[0], nr); 1396a5ed9182SOmar Sandoval if (ret) 1397a5ed9182SOmar Sandoval goto out; 1398a5ed9182SOmar Sandoval btrfs_release_path(path); 1399a5ed9182SOmar Sandoval } 1400a5ed9182SOmar Sandoval 1401a5ed9182SOmar Sandoval ret = 0; 1402a5ed9182SOmar Sandoval out: 1403a5ed9182SOmar Sandoval btrfs_free_path(path); 1404a5ed9182SOmar Sandoval if (ret) 140566642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 1406a5ed9182SOmar Sandoval return ret; 1407a5ed9182SOmar Sandoval } 1408a5ed9182SOmar Sandoval 1409a5ed9182SOmar Sandoval static int load_free_space_bitmaps(struct btrfs_caching_control *caching_ctl, 1410a5ed9182SOmar Sandoval struct btrfs_path *path, 1411a5ed9182SOmar Sandoval u32 expected_extent_count) 1412a5ed9182SOmar Sandoval { 1413a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group; 1414a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info; 1415a5ed9182SOmar Sandoval struct btrfs_root *root; 1416a5ed9182SOmar Sandoval struct btrfs_key key; 1417a5ed9182SOmar Sandoval int prev_bit = 0, bit; 1418a5ed9182SOmar Sandoval /* Initialize to silence GCC. */ 1419a5ed9182SOmar Sandoval u64 extent_start = 0; 1420a5ed9182SOmar Sandoval u64 end, offset; 1421a5ed9182SOmar Sandoval u64 total_found = 0; 1422a5ed9182SOmar Sandoval u32 extent_count = 0; 1423a5ed9182SOmar Sandoval int ret; 1424a5ed9182SOmar Sandoval 1425a5ed9182SOmar Sandoval block_group = caching_ctl->block_group; 1426a5ed9182SOmar Sandoval fs_info = block_group->fs_info; 1427a5ed9182SOmar Sandoval root = fs_info->free_space_root; 1428a5ed9182SOmar Sandoval 1429a5ed9182SOmar Sandoval end = block_group->key.objectid + block_group->key.offset; 1430a5ed9182SOmar Sandoval 1431a5ed9182SOmar Sandoval while (1) { 1432a5ed9182SOmar Sandoval ret = btrfs_next_item(root, path); 1433a5ed9182SOmar Sandoval if (ret < 0) 1434a5ed9182SOmar Sandoval goto out; 1435a5ed9182SOmar Sandoval if (ret) 1436a5ed9182SOmar Sandoval break; 1437a5ed9182SOmar Sandoval 1438a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 1439a5ed9182SOmar Sandoval 1440a5ed9182SOmar Sandoval if (key.type == BTRFS_FREE_SPACE_INFO_KEY) 1441a5ed9182SOmar Sandoval break; 1442a5ed9182SOmar Sandoval 1443a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_BITMAP_KEY); 1444a5ed9182SOmar Sandoval ASSERT(key.objectid < end && key.objectid + key.offset <= end); 1445a5ed9182SOmar Sandoval 1446a5ed9182SOmar Sandoval caching_ctl->progress = key.objectid; 1447a5ed9182SOmar Sandoval 1448a5ed9182SOmar Sandoval offset = key.objectid; 1449a5ed9182SOmar Sandoval while (offset < key.objectid + key.offset) { 1450a5ed9182SOmar Sandoval bit = free_space_test_bit(block_group, path, offset); 1451a5ed9182SOmar Sandoval if (prev_bit == 0 && bit == 1) { 1452a5ed9182SOmar Sandoval extent_start = offset; 1453a5ed9182SOmar Sandoval } else if (prev_bit == 1 && bit == 0) { 1454a5ed9182SOmar Sandoval total_found += add_new_free_space(block_group, 1455a5ed9182SOmar Sandoval fs_info, 1456a5ed9182SOmar Sandoval extent_start, 1457a5ed9182SOmar Sandoval offset); 1458a5ed9182SOmar Sandoval if (total_found > CACHING_CTL_WAKE_UP) { 1459a5ed9182SOmar Sandoval total_found = 0; 1460a5ed9182SOmar Sandoval wake_up(&caching_ctl->wait); 1461a5ed9182SOmar Sandoval } 1462a5ed9182SOmar Sandoval extent_count++; 1463a5ed9182SOmar Sandoval } 1464a5ed9182SOmar Sandoval prev_bit = bit; 14650b246afaSJeff Mahoney offset += fs_info->sectorsize; 1466a5ed9182SOmar Sandoval } 1467a5ed9182SOmar Sandoval } 1468a5ed9182SOmar Sandoval if (prev_bit == 1) { 1469a5ed9182SOmar Sandoval total_found += add_new_free_space(block_group, fs_info, 1470a5ed9182SOmar Sandoval extent_start, end); 1471a5ed9182SOmar Sandoval extent_count++; 1472a5ed9182SOmar Sandoval } 1473a5ed9182SOmar Sandoval 1474a5ed9182SOmar Sandoval if (extent_count != expected_extent_count) { 14755d163e0eSJeff Mahoney btrfs_err(fs_info, 14765d163e0eSJeff Mahoney "incorrect extent count for %llu; counted %u, expected %u", 1477a5ed9182SOmar Sandoval block_group->key.objectid, extent_count, 1478a5ed9182SOmar Sandoval expected_extent_count); 1479a5ed9182SOmar Sandoval ASSERT(0); 1480a5ed9182SOmar Sandoval ret = -EIO; 1481a5ed9182SOmar Sandoval goto out; 1482a5ed9182SOmar Sandoval } 1483a5ed9182SOmar Sandoval 1484a5ed9182SOmar Sandoval caching_ctl->progress = (u64)-1; 1485a5ed9182SOmar Sandoval 1486a5ed9182SOmar Sandoval ret = 0; 1487a5ed9182SOmar Sandoval out: 1488a5ed9182SOmar Sandoval return ret; 1489a5ed9182SOmar Sandoval } 1490a5ed9182SOmar Sandoval 1491a5ed9182SOmar Sandoval static int load_free_space_extents(struct btrfs_caching_control *caching_ctl, 1492a5ed9182SOmar Sandoval struct btrfs_path *path, 1493a5ed9182SOmar Sandoval u32 expected_extent_count) 1494a5ed9182SOmar Sandoval { 1495a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group; 1496a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info; 1497a5ed9182SOmar Sandoval struct btrfs_root *root; 1498a5ed9182SOmar Sandoval struct btrfs_key key; 1499a5ed9182SOmar Sandoval u64 end; 1500a5ed9182SOmar Sandoval u64 total_found = 0; 1501a5ed9182SOmar Sandoval u32 extent_count = 0; 1502a5ed9182SOmar Sandoval int ret; 1503a5ed9182SOmar Sandoval 1504a5ed9182SOmar Sandoval block_group = caching_ctl->block_group; 1505a5ed9182SOmar Sandoval fs_info = block_group->fs_info; 1506a5ed9182SOmar Sandoval root = fs_info->free_space_root; 1507a5ed9182SOmar Sandoval 1508a5ed9182SOmar Sandoval end = block_group->key.objectid + block_group->key.offset; 1509a5ed9182SOmar Sandoval 1510a5ed9182SOmar Sandoval while (1) { 1511a5ed9182SOmar Sandoval ret = btrfs_next_item(root, path); 1512a5ed9182SOmar Sandoval if (ret < 0) 1513a5ed9182SOmar Sandoval goto out; 1514a5ed9182SOmar Sandoval if (ret) 1515a5ed9182SOmar Sandoval break; 1516a5ed9182SOmar Sandoval 1517a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 1518a5ed9182SOmar Sandoval 1519a5ed9182SOmar Sandoval if (key.type == BTRFS_FREE_SPACE_INFO_KEY) 1520a5ed9182SOmar Sandoval break; 1521a5ed9182SOmar Sandoval 1522a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_EXTENT_KEY); 1523a5ed9182SOmar Sandoval ASSERT(key.objectid < end && key.objectid + key.offset <= end); 1524a5ed9182SOmar Sandoval 1525a5ed9182SOmar Sandoval caching_ctl->progress = key.objectid; 1526a5ed9182SOmar Sandoval 1527a5ed9182SOmar Sandoval total_found += add_new_free_space(block_group, fs_info, 1528a5ed9182SOmar Sandoval key.objectid, 1529a5ed9182SOmar Sandoval key.objectid + key.offset); 1530a5ed9182SOmar Sandoval if (total_found > CACHING_CTL_WAKE_UP) { 1531a5ed9182SOmar Sandoval total_found = 0; 1532a5ed9182SOmar Sandoval wake_up(&caching_ctl->wait); 1533a5ed9182SOmar Sandoval } 1534a5ed9182SOmar Sandoval extent_count++; 1535a5ed9182SOmar Sandoval } 1536a5ed9182SOmar Sandoval 1537a5ed9182SOmar Sandoval if (extent_count != expected_extent_count) { 15385d163e0eSJeff Mahoney btrfs_err(fs_info, 15395d163e0eSJeff Mahoney "incorrect extent count for %llu; counted %u, expected %u", 1540a5ed9182SOmar Sandoval block_group->key.objectid, extent_count, 1541a5ed9182SOmar Sandoval expected_extent_count); 1542a5ed9182SOmar Sandoval ASSERT(0); 1543a5ed9182SOmar Sandoval ret = -EIO; 1544a5ed9182SOmar Sandoval goto out; 1545a5ed9182SOmar Sandoval } 1546a5ed9182SOmar Sandoval 1547a5ed9182SOmar Sandoval caching_ctl->progress = (u64)-1; 1548a5ed9182SOmar Sandoval 1549a5ed9182SOmar Sandoval ret = 0; 1550a5ed9182SOmar Sandoval out: 1551a5ed9182SOmar Sandoval return ret; 1552a5ed9182SOmar Sandoval } 1553a5ed9182SOmar Sandoval 1554a5ed9182SOmar Sandoval int load_free_space_tree(struct btrfs_caching_control *caching_ctl) 1555a5ed9182SOmar Sandoval { 1556a5ed9182SOmar Sandoval struct btrfs_block_group_cache *block_group; 1557a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info; 1558a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 1559a5ed9182SOmar Sandoval struct btrfs_path *path; 1560a5ed9182SOmar Sandoval u32 extent_count, flags; 1561a5ed9182SOmar Sandoval int ret; 1562a5ed9182SOmar Sandoval 1563a5ed9182SOmar Sandoval block_group = caching_ctl->block_group; 1564a5ed9182SOmar Sandoval fs_info = block_group->fs_info; 1565a5ed9182SOmar Sandoval 1566a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1567a5ed9182SOmar Sandoval if (!path) 1568a5ed9182SOmar Sandoval return -ENOMEM; 1569a5ed9182SOmar Sandoval 1570a5ed9182SOmar Sandoval /* 1571a5ed9182SOmar Sandoval * Just like caching_thread() doesn't want to deadlock on the extent 1572a5ed9182SOmar Sandoval * tree, we don't want to deadlock on the free space tree. 1573a5ed9182SOmar Sandoval */ 1574a5ed9182SOmar Sandoval path->skip_locking = 1; 1575a5ed9182SOmar Sandoval path->search_commit_root = 1; 15767ce311d5SGu JinXiang path->reada = READA_FORWARD; 1577a5ed9182SOmar Sandoval 1578a5ed9182SOmar Sandoval info = search_free_space_info(NULL, fs_info, block_group, path, 0); 1579a5ed9182SOmar Sandoval if (IS_ERR(info)) { 1580a5ed9182SOmar Sandoval ret = PTR_ERR(info); 1581a5ed9182SOmar Sandoval goto out; 1582a5ed9182SOmar Sandoval } 1583a5ed9182SOmar Sandoval extent_count = btrfs_free_space_extent_count(path->nodes[0], info); 1584a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(path->nodes[0], info); 1585a5ed9182SOmar Sandoval 1586a5ed9182SOmar Sandoval /* 1587a5ed9182SOmar Sandoval * We left path pointing to the free space info item, so now 1588a5ed9182SOmar Sandoval * load_free_space_foo can just iterate through the free space tree from 1589a5ed9182SOmar Sandoval * there. 1590a5ed9182SOmar Sandoval */ 1591a5ed9182SOmar Sandoval if (flags & BTRFS_FREE_SPACE_USING_BITMAPS) 1592a5ed9182SOmar Sandoval ret = load_free_space_bitmaps(caching_ctl, path, extent_count); 1593a5ed9182SOmar Sandoval else 1594a5ed9182SOmar Sandoval ret = load_free_space_extents(caching_ctl, path, extent_count); 1595a5ed9182SOmar Sandoval 1596a5ed9182SOmar Sandoval out: 1597a5ed9182SOmar Sandoval btrfs_free_path(path); 1598a5ed9182SOmar Sandoval return ret; 1599a5ed9182SOmar Sandoval } 1600