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> 89b569ea0SJosef Bacik #include "messages.h" 9a5ed9182SOmar Sandoval #include "ctree.h" 10a5ed9182SOmar Sandoval #include "disk-io.h" 11a5ed9182SOmar Sandoval #include "locking.h" 12a5ed9182SOmar Sandoval #include "free-space-tree.h" 13a5ed9182SOmar Sandoval #include "transaction.h" 14aac0023cSJosef Bacik #include "block-group.h" 15c7f13d42SJosef Bacik #include "fs.h" 1607e81dc9SJosef Bacik #include "accessors.h" 17*a0231804SJosef Bacik #include "extent-tree.h" 18a5ed9182SOmar Sandoval 19a5ed9182SOmar Sandoval static int __add_block_group_free_space(struct btrfs_trans_handle *trans, 2032da5386SDavid Sterba struct btrfs_block_group *block_group, 21a5ed9182SOmar Sandoval struct btrfs_path *path); 22a5ed9182SOmar Sandoval 237939dd9fSJosef Bacik static struct btrfs_root *btrfs_free_space_root( 247939dd9fSJosef Bacik struct btrfs_block_group *block_group) 257939dd9fSJosef Bacik { 26abed4aaaSJosef Bacik struct btrfs_key key = { 27abed4aaaSJosef Bacik .objectid = BTRFS_FREE_SPACE_TREE_OBJECTID, 28abed4aaaSJosef Bacik .type = BTRFS_ROOT_ITEM_KEY, 29abed4aaaSJosef Bacik .offset = 0, 30abed4aaaSJosef Bacik }; 31abed4aaaSJosef Bacik 32f7238e50SJosef Bacik if (btrfs_fs_incompat(block_group->fs_info, EXTENT_TREE_V2)) 33f7238e50SJosef Bacik key.offset = block_group->global_root_id; 34abed4aaaSJosef Bacik return btrfs_global_root(block_group->fs_info, &key); 357939dd9fSJosef Bacik } 367939dd9fSJosef Bacik 3732da5386SDavid Sterba void set_free_space_tree_thresholds(struct btrfs_block_group *cache) 38a5ed9182SOmar Sandoval { 39a5ed9182SOmar Sandoval u32 bitmap_range; 40a5ed9182SOmar Sandoval size_t bitmap_size; 41a5ed9182SOmar Sandoval u64 num_bitmaps, total_bitmap_size; 42a5ed9182SOmar Sandoval 43e3e39c72SMarcos Paulo de Souza if (WARN_ON(cache->length == 0)) 44e3e39c72SMarcos Paulo de Souza btrfs_warn(cache->fs_info, "block group %llu length is zero", 45e3e39c72SMarcos Paulo de Souza cache->start); 46e3e39c72SMarcos Paulo de Souza 47a5ed9182SOmar Sandoval /* 48a5ed9182SOmar Sandoval * We convert to bitmaps when the disk space required for using extents 49a5ed9182SOmar Sandoval * exceeds that required for using bitmaps. 50a5ed9182SOmar Sandoval */ 51da17066cSJeff Mahoney bitmap_range = cache->fs_info->sectorsize * BTRFS_FREE_SPACE_BITMAP_BITS; 52b3470b5dSDavid Sterba num_bitmaps = div_u64(cache->length + bitmap_range - 1, bitmap_range); 53a5ed9182SOmar Sandoval bitmap_size = sizeof(struct btrfs_item) + BTRFS_FREE_SPACE_BITMAP_SIZE; 54a5ed9182SOmar Sandoval total_bitmap_size = num_bitmaps * bitmap_size; 55a5ed9182SOmar Sandoval cache->bitmap_high_thresh = div_u64(total_bitmap_size, 56a5ed9182SOmar Sandoval sizeof(struct btrfs_item)); 57a5ed9182SOmar Sandoval 58a5ed9182SOmar Sandoval /* 59a5ed9182SOmar Sandoval * We allow for a small buffer between the high threshold and low 60a5ed9182SOmar Sandoval * threshold to avoid thrashing back and forth between the two formats. 61a5ed9182SOmar Sandoval */ 62a5ed9182SOmar Sandoval if (cache->bitmap_high_thresh > 100) 63a5ed9182SOmar Sandoval cache->bitmap_low_thresh = cache->bitmap_high_thresh - 100; 64a5ed9182SOmar Sandoval else 65a5ed9182SOmar Sandoval cache->bitmap_low_thresh = 0; 66a5ed9182SOmar Sandoval } 67a5ed9182SOmar Sandoval 68a5ed9182SOmar Sandoval static int add_new_free_space_info(struct btrfs_trans_handle *trans, 6932da5386SDavid Sterba struct btrfs_block_group *block_group, 70a5ed9182SOmar Sandoval struct btrfs_path *path) 71a5ed9182SOmar Sandoval { 727939dd9fSJosef Bacik struct btrfs_root *root = btrfs_free_space_root(block_group); 73a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 74a5ed9182SOmar Sandoval struct btrfs_key key; 75a5ed9182SOmar Sandoval struct extent_buffer *leaf; 76a5ed9182SOmar Sandoval int ret; 77a5ed9182SOmar Sandoval 78b3470b5dSDavid Sterba key.objectid = block_group->start; 79a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_INFO_KEY; 80b3470b5dSDavid Sterba key.offset = block_group->length; 81a5ed9182SOmar Sandoval 82a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(*info)); 83a5ed9182SOmar Sandoval if (ret) 84a5ed9182SOmar Sandoval goto out; 85a5ed9182SOmar Sandoval 86a5ed9182SOmar Sandoval leaf = path->nodes[0]; 87a5ed9182SOmar Sandoval info = btrfs_item_ptr(leaf, path->slots[0], 88a5ed9182SOmar Sandoval struct btrfs_free_space_info); 89a5ed9182SOmar Sandoval btrfs_set_free_space_extent_count(leaf, info, 0); 90a5ed9182SOmar Sandoval btrfs_set_free_space_flags(leaf, info, 0); 91a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 92a5ed9182SOmar Sandoval 93a5ed9182SOmar Sandoval ret = 0; 94a5ed9182SOmar Sandoval out: 95a5ed9182SOmar Sandoval btrfs_release_path(path); 96a5ed9182SOmar Sandoval return ret; 97a5ed9182SOmar Sandoval } 98a5ed9182SOmar Sandoval 99ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 100ce9f967fSJohannes Thumshirn struct btrfs_free_space_info *search_free_space_info( 1012ccf545eSDavid Sterba struct btrfs_trans_handle *trans, 10232da5386SDavid Sterba struct btrfs_block_group *block_group, 103a5ed9182SOmar Sandoval struct btrfs_path *path, int cow) 104a5ed9182SOmar Sandoval { 1052ccf545eSDavid Sterba struct btrfs_fs_info *fs_info = block_group->fs_info; 1067939dd9fSJosef Bacik struct btrfs_root *root = btrfs_free_space_root(block_group); 107a5ed9182SOmar Sandoval struct btrfs_key key; 108a5ed9182SOmar Sandoval int ret; 109a5ed9182SOmar Sandoval 110b3470b5dSDavid Sterba key.objectid = block_group->start; 111a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_INFO_KEY; 112b3470b5dSDavid Sterba key.offset = block_group->length; 113a5ed9182SOmar Sandoval 114a5ed9182SOmar Sandoval ret = btrfs_search_slot(trans, root, &key, path, 0, cow); 115a5ed9182SOmar Sandoval if (ret < 0) 116a5ed9182SOmar Sandoval return ERR_PTR(ret); 117a5ed9182SOmar Sandoval if (ret != 0) { 118ab8d0fc4SJeff Mahoney btrfs_warn(fs_info, "missing free space info for %llu", 119b3470b5dSDavid Sterba block_group->start); 120a5ed9182SOmar Sandoval ASSERT(0); 121a5ed9182SOmar Sandoval return ERR_PTR(-ENOENT); 122a5ed9182SOmar Sandoval } 123a5ed9182SOmar Sandoval 124a5ed9182SOmar Sandoval return btrfs_item_ptr(path->nodes[0], path->slots[0], 125a5ed9182SOmar Sandoval struct btrfs_free_space_info); 126a5ed9182SOmar Sandoval } 127a5ed9182SOmar Sandoval 128a5ed9182SOmar Sandoval /* 129a5ed9182SOmar Sandoval * btrfs_search_slot() but we're looking for the greatest key less than the 130a5ed9182SOmar Sandoval * passed key. 131a5ed9182SOmar Sandoval */ 132a5ed9182SOmar Sandoval static int btrfs_search_prev_slot(struct btrfs_trans_handle *trans, 133a5ed9182SOmar Sandoval struct btrfs_root *root, 134a5ed9182SOmar Sandoval struct btrfs_key *key, struct btrfs_path *p, 135a5ed9182SOmar Sandoval int ins_len, int cow) 136a5ed9182SOmar Sandoval { 137a5ed9182SOmar Sandoval int ret; 138a5ed9182SOmar Sandoval 139a5ed9182SOmar Sandoval ret = btrfs_search_slot(trans, root, key, p, ins_len, cow); 140a5ed9182SOmar Sandoval if (ret < 0) 141a5ed9182SOmar Sandoval return ret; 142a5ed9182SOmar Sandoval 143a5ed9182SOmar Sandoval if (ret == 0) { 144a5ed9182SOmar Sandoval ASSERT(0); 145a5ed9182SOmar Sandoval return -EIO; 146a5ed9182SOmar Sandoval } 147a5ed9182SOmar Sandoval 148a5ed9182SOmar Sandoval if (p->slots[0] == 0) { 149a5ed9182SOmar Sandoval ASSERT(0); 150a5ed9182SOmar Sandoval return -EIO; 151a5ed9182SOmar Sandoval } 152a5ed9182SOmar Sandoval p->slots[0]--; 153a5ed9182SOmar Sandoval 154a5ed9182SOmar Sandoval return 0; 155a5ed9182SOmar Sandoval } 156a5ed9182SOmar Sandoval 157098e6308SDavid Sterba static inline u32 free_space_bitmap_size(const struct btrfs_fs_info *fs_info, 158098e6308SDavid Sterba u64 size) 159a5ed9182SOmar Sandoval { 160098e6308SDavid Sterba return DIV_ROUND_UP(size >> fs_info->sectorsize_bits, BITS_PER_BYTE); 161a5ed9182SOmar Sandoval } 162a5ed9182SOmar Sandoval 163a565971fSHoward McLauchlan static unsigned long *alloc_bitmap(u32 bitmap_size) 164a5ed9182SOmar Sandoval { 165a565971fSHoward McLauchlan unsigned long *ret; 16625ff17e8SOmar Sandoval unsigned int nofs_flag; 167a565971fSHoward McLauchlan u32 bitmap_rounded_size = round_up(bitmap_size, sizeof(unsigned long)); 16879b134a2SDavid Sterba 16979b134a2SDavid Sterba /* 17025ff17e8SOmar Sandoval * GFP_NOFS doesn't work with kvmalloc(), but we really can't recurse 17125ff17e8SOmar Sandoval * into the filesystem as the free space bitmap can be modified in the 17225ff17e8SOmar Sandoval * critical section of a transaction commit. 17325ff17e8SOmar Sandoval * 17425ff17e8SOmar Sandoval * TODO: push the memalloc_nofs_{save,restore}() to the caller where we 17525ff17e8SOmar Sandoval * know that recursion is unsafe. 17679b134a2SDavid Sterba */ 17725ff17e8SOmar Sandoval nofs_flag = memalloc_nofs_save(); 178a565971fSHoward McLauchlan ret = kvzalloc(bitmap_rounded_size, GFP_KERNEL); 17925ff17e8SOmar Sandoval memalloc_nofs_restore(nofs_flag); 18025ff17e8SOmar Sandoval return ret; 181a5ed9182SOmar Sandoval } 182a5ed9182SOmar Sandoval 183a565971fSHoward McLauchlan static void le_bitmap_set(unsigned long *map, unsigned int start, int len) 1846faa8f47SHoward McLauchlan { 185a565971fSHoward McLauchlan u8 *p = ((u8 *)map) + BIT_BYTE(start); 1866faa8f47SHoward McLauchlan const unsigned int size = start + len; 1876faa8f47SHoward McLauchlan int bits_to_set = BITS_PER_BYTE - (start % BITS_PER_BYTE); 1886faa8f47SHoward McLauchlan u8 mask_to_set = BITMAP_FIRST_BYTE_MASK(start); 1896faa8f47SHoward McLauchlan 1906faa8f47SHoward McLauchlan while (len - bits_to_set >= 0) { 1916faa8f47SHoward McLauchlan *p |= mask_to_set; 1926faa8f47SHoward McLauchlan len -= bits_to_set; 1936faa8f47SHoward McLauchlan bits_to_set = BITS_PER_BYTE; 1946faa8f47SHoward McLauchlan mask_to_set = ~0; 1956faa8f47SHoward McLauchlan p++; 1966faa8f47SHoward McLauchlan } 1976faa8f47SHoward McLauchlan if (len) { 1986faa8f47SHoward McLauchlan mask_to_set &= BITMAP_LAST_BYTE_MASK(size); 1996faa8f47SHoward McLauchlan *p |= mask_to_set; 2006faa8f47SHoward McLauchlan } 2016faa8f47SHoward McLauchlan } 2026faa8f47SHoward McLauchlan 203ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 204a5ed9182SOmar Sandoval int convert_free_space_to_bitmaps(struct btrfs_trans_handle *trans, 20532da5386SDavid Sterba struct btrfs_block_group *block_group, 206a5ed9182SOmar Sandoval struct btrfs_path *path) 207a5ed9182SOmar Sandoval { 208719fb4deSNikolay Borisov struct btrfs_fs_info *fs_info = trans->fs_info; 2097939dd9fSJosef Bacik struct btrfs_root *root = btrfs_free_space_root(block_group); 210a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 211a5ed9182SOmar Sandoval struct btrfs_key key, found_key; 212a5ed9182SOmar Sandoval struct extent_buffer *leaf; 213a565971fSHoward McLauchlan unsigned long *bitmap; 214a565971fSHoward McLauchlan char *bitmap_cursor; 215a5ed9182SOmar Sandoval u64 start, end; 216a5ed9182SOmar Sandoval u64 bitmap_range, i; 217a5ed9182SOmar Sandoval u32 bitmap_size, flags, expected_extent_count; 218a5ed9182SOmar Sandoval u32 extent_count = 0; 219a5ed9182SOmar Sandoval int done = 0, nr; 220a5ed9182SOmar Sandoval int ret; 221a5ed9182SOmar Sandoval 222098e6308SDavid Sterba bitmap_size = free_space_bitmap_size(fs_info, block_group->length); 223a5ed9182SOmar Sandoval bitmap = alloc_bitmap(bitmap_size); 224a5ed9182SOmar Sandoval if (!bitmap) { 225a5ed9182SOmar Sandoval ret = -ENOMEM; 226a5ed9182SOmar Sandoval goto out; 227a5ed9182SOmar Sandoval } 228a5ed9182SOmar Sandoval 229b3470b5dSDavid Sterba start = block_group->start; 230b3470b5dSDavid Sterba end = block_group->start + block_group->length; 231a5ed9182SOmar Sandoval 232a5ed9182SOmar Sandoval key.objectid = end - 1; 233a5ed9182SOmar Sandoval key.type = (u8)-1; 234a5ed9182SOmar Sandoval key.offset = (u64)-1; 235a5ed9182SOmar Sandoval 236a5ed9182SOmar Sandoval while (!done) { 237a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 238a5ed9182SOmar Sandoval if (ret) 239a5ed9182SOmar Sandoval goto out; 240a5ed9182SOmar Sandoval 241a5ed9182SOmar Sandoval leaf = path->nodes[0]; 242a5ed9182SOmar Sandoval nr = 0; 243a5ed9182SOmar Sandoval path->slots[0]++; 244a5ed9182SOmar Sandoval while (path->slots[0] > 0) { 245a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0] - 1); 246a5ed9182SOmar Sandoval 247a5ed9182SOmar Sandoval if (found_key.type == BTRFS_FREE_SPACE_INFO_KEY) { 248b3470b5dSDavid Sterba ASSERT(found_key.objectid == block_group->start); 249b3470b5dSDavid Sterba ASSERT(found_key.offset == block_group->length); 250a5ed9182SOmar Sandoval done = 1; 251a5ed9182SOmar Sandoval break; 252a5ed9182SOmar Sandoval } else if (found_key.type == BTRFS_FREE_SPACE_EXTENT_KEY) { 253a5ed9182SOmar Sandoval u64 first, last; 254a5ed9182SOmar Sandoval 255a5ed9182SOmar Sandoval ASSERT(found_key.objectid >= start); 256a5ed9182SOmar Sandoval ASSERT(found_key.objectid < end); 257a5ed9182SOmar Sandoval ASSERT(found_key.objectid + found_key.offset <= end); 258a5ed9182SOmar Sandoval 259a5ed9182SOmar Sandoval first = div_u64(found_key.objectid - start, 2600b246afaSJeff Mahoney fs_info->sectorsize); 261a5ed9182SOmar Sandoval last = div_u64(found_key.objectid + found_key.offset - start, 2620b246afaSJeff Mahoney fs_info->sectorsize); 2632fe1d551SOmar Sandoval le_bitmap_set(bitmap, first, last - first); 264a5ed9182SOmar Sandoval 265a5ed9182SOmar Sandoval extent_count++; 266a5ed9182SOmar Sandoval nr++; 267a5ed9182SOmar Sandoval path->slots[0]--; 268a5ed9182SOmar Sandoval } else { 269a5ed9182SOmar Sandoval ASSERT(0); 270a5ed9182SOmar Sandoval } 271a5ed9182SOmar Sandoval } 272a5ed9182SOmar Sandoval 273a5ed9182SOmar Sandoval ret = btrfs_del_items(trans, root, path, path->slots[0], nr); 274a5ed9182SOmar Sandoval if (ret) 275a5ed9182SOmar Sandoval goto out; 276a5ed9182SOmar Sandoval btrfs_release_path(path); 277a5ed9182SOmar Sandoval } 278a5ed9182SOmar Sandoval 2792ccf545eSDavid Sterba info = search_free_space_info(trans, block_group, path, 1); 280a5ed9182SOmar Sandoval if (IS_ERR(info)) { 281a5ed9182SOmar Sandoval ret = PTR_ERR(info); 282a5ed9182SOmar Sandoval goto out; 283a5ed9182SOmar Sandoval } 284a5ed9182SOmar Sandoval leaf = path->nodes[0]; 285a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(leaf, info); 286a5ed9182SOmar Sandoval flags |= BTRFS_FREE_SPACE_USING_BITMAPS; 287a5ed9182SOmar Sandoval btrfs_set_free_space_flags(leaf, info, flags); 288a5ed9182SOmar Sandoval expected_extent_count = btrfs_free_space_extent_count(leaf, info); 289a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 290a5ed9182SOmar Sandoval btrfs_release_path(path); 291a5ed9182SOmar Sandoval 292a5ed9182SOmar Sandoval if (extent_count != expected_extent_count) { 2935d163e0eSJeff Mahoney btrfs_err(fs_info, 2945d163e0eSJeff Mahoney "incorrect extent count for %llu; counted %u, expected %u", 295b3470b5dSDavid Sterba block_group->start, extent_count, 296a5ed9182SOmar Sandoval expected_extent_count); 297a5ed9182SOmar Sandoval ASSERT(0); 298a5ed9182SOmar Sandoval ret = -EIO; 299a5ed9182SOmar Sandoval goto out; 300a5ed9182SOmar Sandoval } 301a5ed9182SOmar Sandoval 302a565971fSHoward McLauchlan bitmap_cursor = (char *)bitmap; 3030b246afaSJeff Mahoney bitmap_range = fs_info->sectorsize * BTRFS_FREE_SPACE_BITMAP_BITS; 304a5ed9182SOmar Sandoval i = start; 305a5ed9182SOmar Sandoval while (i < end) { 306a5ed9182SOmar Sandoval unsigned long ptr; 307a5ed9182SOmar Sandoval u64 extent_size; 308a5ed9182SOmar Sandoval u32 data_size; 309a5ed9182SOmar Sandoval 310a5ed9182SOmar Sandoval extent_size = min(end - i, bitmap_range); 311098e6308SDavid Sterba data_size = free_space_bitmap_size(fs_info, extent_size); 312a5ed9182SOmar Sandoval 313a5ed9182SOmar Sandoval key.objectid = i; 314a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_BITMAP_KEY; 315a5ed9182SOmar Sandoval key.offset = extent_size; 316a5ed9182SOmar Sandoval 317a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, 318a5ed9182SOmar Sandoval data_size); 319a5ed9182SOmar Sandoval if (ret) 320a5ed9182SOmar Sandoval goto out; 321a5ed9182SOmar Sandoval 322a5ed9182SOmar Sandoval leaf = path->nodes[0]; 323a5ed9182SOmar Sandoval ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); 324a5ed9182SOmar Sandoval write_extent_buffer(leaf, bitmap_cursor, ptr, 325a5ed9182SOmar Sandoval data_size); 326a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 327a5ed9182SOmar Sandoval btrfs_release_path(path); 328a5ed9182SOmar Sandoval 329a5ed9182SOmar Sandoval i += extent_size; 330a5ed9182SOmar Sandoval bitmap_cursor += data_size; 331a5ed9182SOmar Sandoval } 332a5ed9182SOmar Sandoval 333a5ed9182SOmar Sandoval ret = 0; 334a5ed9182SOmar Sandoval out: 33579b134a2SDavid Sterba kvfree(bitmap); 336a5ed9182SOmar Sandoval if (ret) 33766642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 338a5ed9182SOmar Sandoval return ret; 339a5ed9182SOmar Sandoval } 340a5ed9182SOmar Sandoval 341ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 342a5ed9182SOmar Sandoval int convert_free_space_to_extents(struct btrfs_trans_handle *trans, 34332da5386SDavid Sterba struct btrfs_block_group *block_group, 344a5ed9182SOmar Sandoval struct btrfs_path *path) 345a5ed9182SOmar Sandoval { 3465296c2bfSNikolay Borisov struct btrfs_fs_info *fs_info = trans->fs_info; 3477939dd9fSJosef Bacik struct btrfs_root *root = btrfs_free_space_root(block_group); 348a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 349a5ed9182SOmar Sandoval struct btrfs_key key, found_key; 350a5ed9182SOmar Sandoval struct extent_buffer *leaf; 351a565971fSHoward McLauchlan unsigned long *bitmap; 352a5ed9182SOmar Sandoval u64 start, end; 353a5ed9182SOmar Sandoval u32 bitmap_size, flags, expected_extent_count; 354a565971fSHoward McLauchlan unsigned long nrbits, start_bit, end_bit; 355a5ed9182SOmar Sandoval u32 extent_count = 0; 356a5ed9182SOmar Sandoval int done = 0, nr; 357a5ed9182SOmar Sandoval int ret; 358a5ed9182SOmar Sandoval 359098e6308SDavid Sterba bitmap_size = free_space_bitmap_size(fs_info, block_group->length); 360a5ed9182SOmar Sandoval bitmap = alloc_bitmap(bitmap_size); 361a5ed9182SOmar Sandoval if (!bitmap) { 362a5ed9182SOmar Sandoval ret = -ENOMEM; 363a5ed9182SOmar Sandoval goto out; 364a5ed9182SOmar Sandoval } 365a5ed9182SOmar Sandoval 366b3470b5dSDavid Sterba start = block_group->start; 367b3470b5dSDavid Sterba end = block_group->start + block_group->length; 368a5ed9182SOmar Sandoval 369a5ed9182SOmar Sandoval key.objectid = end - 1; 370a5ed9182SOmar Sandoval key.type = (u8)-1; 371a5ed9182SOmar Sandoval key.offset = (u64)-1; 372a5ed9182SOmar Sandoval 373a5ed9182SOmar Sandoval while (!done) { 374a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 375a5ed9182SOmar Sandoval if (ret) 376a5ed9182SOmar Sandoval goto out; 377a5ed9182SOmar Sandoval 378a5ed9182SOmar Sandoval leaf = path->nodes[0]; 379a5ed9182SOmar Sandoval nr = 0; 380a5ed9182SOmar Sandoval path->slots[0]++; 381a5ed9182SOmar Sandoval while (path->slots[0] > 0) { 382a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0] - 1); 383a5ed9182SOmar Sandoval 384a5ed9182SOmar Sandoval if (found_key.type == BTRFS_FREE_SPACE_INFO_KEY) { 385b3470b5dSDavid Sterba ASSERT(found_key.objectid == block_group->start); 386b3470b5dSDavid Sterba ASSERT(found_key.offset == block_group->length); 387a5ed9182SOmar Sandoval done = 1; 388a5ed9182SOmar Sandoval break; 389a5ed9182SOmar Sandoval } else if (found_key.type == BTRFS_FREE_SPACE_BITMAP_KEY) { 390a5ed9182SOmar Sandoval unsigned long ptr; 391a565971fSHoward McLauchlan char *bitmap_cursor; 392a5ed9182SOmar Sandoval u32 bitmap_pos, data_size; 393a5ed9182SOmar Sandoval 394a5ed9182SOmar Sandoval ASSERT(found_key.objectid >= start); 395a5ed9182SOmar Sandoval ASSERT(found_key.objectid < end); 396a5ed9182SOmar Sandoval ASSERT(found_key.objectid + found_key.offset <= end); 397a5ed9182SOmar Sandoval 398a5ed9182SOmar Sandoval bitmap_pos = div_u64(found_key.objectid - start, 3990b246afaSJeff Mahoney fs_info->sectorsize * 400a5ed9182SOmar Sandoval BITS_PER_BYTE); 401a565971fSHoward McLauchlan bitmap_cursor = ((char *)bitmap) + bitmap_pos; 402098e6308SDavid Sterba data_size = free_space_bitmap_size(fs_info, 403098e6308SDavid Sterba found_key.offset); 404a5ed9182SOmar Sandoval 405a5ed9182SOmar Sandoval ptr = btrfs_item_ptr_offset(leaf, path->slots[0] - 1); 406a5ed9182SOmar Sandoval read_extent_buffer(leaf, bitmap_cursor, ptr, 407a5ed9182SOmar Sandoval data_size); 408a5ed9182SOmar Sandoval 409a5ed9182SOmar Sandoval nr++; 410a5ed9182SOmar Sandoval path->slots[0]--; 411a5ed9182SOmar Sandoval } else { 412a5ed9182SOmar Sandoval ASSERT(0); 413a5ed9182SOmar Sandoval } 414a5ed9182SOmar Sandoval } 415a5ed9182SOmar Sandoval 416a5ed9182SOmar Sandoval ret = btrfs_del_items(trans, root, path, path->slots[0], nr); 417a5ed9182SOmar Sandoval if (ret) 418a5ed9182SOmar Sandoval goto out; 419a5ed9182SOmar Sandoval btrfs_release_path(path); 420a5ed9182SOmar Sandoval } 421a5ed9182SOmar Sandoval 4222ccf545eSDavid Sterba info = search_free_space_info(trans, block_group, path, 1); 423a5ed9182SOmar Sandoval if (IS_ERR(info)) { 424a5ed9182SOmar Sandoval ret = PTR_ERR(info); 425a5ed9182SOmar Sandoval goto out; 426a5ed9182SOmar Sandoval } 427a5ed9182SOmar Sandoval leaf = path->nodes[0]; 428a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(leaf, info); 429a5ed9182SOmar Sandoval flags &= ~BTRFS_FREE_SPACE_USING_BITMAPS; 430a5ed9182SOmar Sandoval btrfs_set_free_space_flags(leaf, info, flags); 431a5ed9182SOmar Sandoval expected_extent_count = btrfs_free_space_extent_count(leaf, info); 432a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 433a5ed9182SOmar Sandoval btrfs_release_path(path); 434a5ed9182SOmar Sandoval 435ab108d99SDavid Sterba nrbits = block_group->length >> block_group->fs_info->sectorsize_bits; 436a565971fSHoward McLauchlan start_bit = find_next_bit_le(bitmap, nrbits, 0); 437a565971fSHoward McLauchlan 438a565971fSHoward McLauchlan while (start_bit < nrbits) { 439a565971fSHoward McLauchlan end_bit = find_next_zero_bit_le(bitmap, nrbits, start_bit); 440a565971fSHoward McLauchlan ASSERT(start_bit < end_bit); 441a565971fSHoward McLauchlan 442a565971fSHoward McLauchlan key.objectid = start + start_bit * block_group->fs_info->sectorsize; 443a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_EXTENT_KEY; 444a565971fSHoward McLauchlan key.offset = (end_bit - start_bit) * block_group->fs_info->sectorsize; 445a5ed9182SOmar Sandoval 446a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, 0); 447a5ed9182SOmar Sandoval if (ret) 448a5ed9182SOmar Sandoval goto out; 449a5ed9182SOmar Sandoval btrfs_release_path(path); 450a5ed9182SOmar Sandoval 451a5ed9182SOmar Sandoval extent_count++; 452a5ed9182SOmar Sandoval 453a565971fSHoward McLauchlan start_bit = find_next_bit_le(bitmap, nrbits, end_bit); 454a5ed9182SOmar Sandoval } 455a5ed9182SOmar Sandoval 456a5ed9182SOmar Sandoval if (extent_count != expected_extent_count) { 4575d163e0eSJeff Mahoney btrfs_err(fs_info, 4585d163e0eSJeff Mahoney "incorrect extent count for %llu; counted %u, expected %u", 459b3470b5dSDavid Sterba block_group->start, extent_count, 460a5ed9182SOmar Sandoval expected_extent_count); 461a5ed9182SOmar Sandoval ASSERT(0); 462a5ed9182SOmar Sandoval ret = -EIO; 463a5ed9182SOmar Sandoval goto out; 464a5ed9182SOmar Sandoval } 465a5ed9182SOmar Sandoval 466a5ed9182SOmar Sandoval ret = 0; 467a5ed9182SOmar Sandoval out: 46879b134a2SDavid Sterba kvfree(bitmap); 469a5ed9182SOmar Sandoval if (ret) 47066642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 471a5ed9182SOmar Sandoval return ret; 472a5ed9182SOmar Sandoval } 473a5ed9182SOmar Sandoval 474a5ed9182SOmar Sandoval static int update_free_space_extent_count(struct btrfs_trans_handle *trans, 47532da5386SDavid Sterba struct btrfs_block_group *block_group, 476a5ed9182SOmar Sandoval struct btrfs_path *path, 477a5ed9182SOmar Sandoval int new_extents) 478a5ed9182SOmar Sandoval { 479a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 480a5ed9182SOmar Sandoval u32 flags; 481a5ed9182SOmar Sandoval u32 extent_count; 482a5ed9182SOmar Sandoval int ret = 0; 483a5ed9182SOmar Sandoval 484a5ed9182SOmar Sandoval if (new_extents == 0) 485a5ed9182SOmar Sandoval return 0; 486a5ed9182SOmar Sandoval 4872ccf545eSDavid Sterba info = search_free_space_info(trans, block_group, path, 1); 488a5ed9182SOmar Sandoval if (IS_ERR(info)) { 489a5ed9182SOmar Sandoval ret = PTR_ERR(info); 490a5ed9182SOmar Sandoval goto out; 491a5ed9182SOmar Sandoval } 492a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(path->nodes[0], info); 493a5ed9182SOmar Sandoval extent_count = btrfs_free_space_extent_count(path->nodes[0], info); 494a5ed9182SOmar Sandoval 495a5ed9182SOmar Sandoval extent_count += new_extents; 496a5ed9182SOmar Sandoval btrfs_set_free_space_extent_count(path->nodes[0], info, extent_count); 497a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(path->nodes[0]); 498a5ed9182SOmar Sandoval btrfs_release_path(path); 499a5ed9182SOmar Sandoval 500a5ed9182SOmar Sandoval if (!(flags & BTRFS_FREE_SPACE_USING_BITMAPS) && 501a5ed9182SOmar Sandoval extent_count > block_group->bitmap_high_thresh) { 502719fb4deSNikolay Borisov ret = convert_free_space_to_bitmaps(trans, block_group, path); 503a5ed9182SOmar Sandoval } else if ((flags & BTRFS_FREE_SPACE_USING_BITMAPS) && 504a5ed9182SOmar Sandoval extent_count < block_group->bitmap_low_thresh) { 5055296c2bfSNikolay Borisov ret = convert_free_space_to_extents(trans, block_group, path); 506a5ed9182SOmar Sandoval } 507a5ed9182SOmar Sandoval 508a5ed9182SOmar Sandoval out: 509a5ed9182SOmar Sandoval return ret; 510a5ed9182SOmar Sandoval } 511a5ed9182SOmar Sandoval 512ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 51332da5386SDavid Sterba int free_space_test_bit(struct btrfs_block_group *block_group, 514a5ed9182SOmar Sandoval struct btrfs_path *path, u64 offset) 515a5ed9182SOmar Sandoval { 516a5ed9182SOmar Sandoval struct extent_buffer *leaf; 517a5ed9182SOmar Sandoval struct btrfs_key key; 518a5ed9182SOmar Sandoval u64 found_start, found_end; 519a5ed9182SOmar Sandoval unsigned long ptr, i; 520a5ed9182SOmar Sandoval 521a5ed9182SOmar Sandoval leaf = path->nodes[0]; 522a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); 523a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_BITMAP_KEY); 524a5ed9182SOmar Sandoval 525a5ed9182SOmar Sandoval found_start = key.objectid; 526a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 527a5ed9182SOmar Sandoval ASSERT(offset >= found_start && offset < found_end); 528a5ed9182SOmar Sandoval 529a5ed9182SOmar Sandoval ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); 530da17066cSJeff Mahoney i = div_u64(offset - found_start, 531da17066cSJeff Mahoney block_group->fs_info->sectorsize); 532a5ed9182SOmar Sandoval return !!extent_buffer_test_bit(leaf, ptr, i); 533a5ed9182SOmar Sandoval } 534a5ed9182SOmar Sandoval 53532da5386SDavid Sterba static void free_space_set_bits(struct btrfs_block_group *block_group, 536a5ed9182SOmar Sandoval struct btrfs_path *path, u64 *start, u64 *size, 537a5ed9182SOmar Sandoval int bit) 538a5ed9182SOmar Sandoval { 5390b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = block_group->fs_info; 540a5ed9182SOmar Sandoval struct extent_buffer *leaf; 541a5ed9182SOmar Sandoval struct btrfs_key key; 542a5ed9182SOmar Sandoval u64 end = *start + *size; 543a5ed9182SOmar Sandoval u64 found_start, found_end; 544a5ed9182SOmar Sandoval unsigned long ptr, first, last; 545a5ed9182SOmar Sandoval 546a5ed9182SOmar Sandoval leaf = path->nodes[0]; 547a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); 548a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_BITMAP_KEY); 549a5ed9182SOmar Sandoval 550a5ed9182SOmar Sandoval found_start = key.objectid; 551a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 552a5ed9182SOmar Sandoval ASSERT(*start >= found_start && *start < found_end); 553a5ed9182SOmar Sandoval ASSERT(end > found_start); 554a5ed9182SOmar Sandoval 555a5ed9182SOmar Sandoval if (end > found_end) 556a5ed9182SOmar Sandoval end = found_end; 557a5ed9182SOmar Sandoval 558a5ed9182SOmar Sandoval ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); 559ab108d99SDavid Sterba first = (*start - found_start) >> fs_info->sectorsize_bits; 560ab108d99SDavid Sterba last = (end - found_start) >> fs_info->sectorsize_bits; 561a5ed9182SOmar Sandoval if (bit) 562a5ed9182SOmar Sandoval extent_buffer_bitmap_set(leaf, ptr, first, last - first); 563a5ed9182SOmar Sandoval else 564a5ed9182SOmar Sandoval extent_buffer_bitmap_clear(leaf, ptr, first, last - first); 565a5ed9182SOmar Sandoval btrfs_mark_buffer_dirty(leaf); 566a5ed9182SOmar Sandoval 567a5ed9182SOmar Sandoval *size -= end - *start; 568a5ed9182SOmar Sandoval *start = end; 569a5ed9182SOmar Sandoval } 570a5ed9182SOmar Sandoval 571a5ed9182SOmar Sandoval /* 572a5ed9182SOmar Sandoval * We can't use btrfs_next_item() in modify_free_space_bitmap() because 573a5ed9182SOmar Sandoval * btrfs_next_leaf() doesn't get the path for writing. We can forgo the fancy 574a5ed9182SOmar Sandoval * tree walking in btrfs_next_leaf() anyways because we know exactly what we're 575a5ed9182SOmar Sandoval * looking for. 576a5ed9182SOmar Sandoval */ 577a5ed9182SOmar Sandoval static int free_space_next_bitmap(struct btrfs_trans_handle *trans, 578a5ed9182SOmar Sandoval struct btrfs_root *root, struct btrfs_path *p) 579a5ed9182SOmar Sandoval { 580a5ed9182SOmar Sandoval struct btrfs_key key; 581a5ed9182SOmar Sandoval 582a5ed9182SOmar Sandoval if (p->slots[0] + 1 < btrfs_header_nritems(p->nodes[0])) { 583a5ed9182SOmar Sandoval p->slots[0]++; 584a5ed9182SOmar Sandoval return 0; 585a5ed9182SOmar Sandoval } 586a5ed9182SOmar Sandoval 587a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(p->nodes[0], &key, p->slots[0]); 588a5ed9182SOmar Sandoval btrfs_release_path(p); 589a5ed9182SOmar Sandoval 590a5ed9182SOmar Sandoval key.objectid += key.offset; 591a5ed9182SOmar Sandoval key.type = (u8)-1; 592a5ed9182SOmar Sandoval key.offset = (u64)-1; 593a5ed9182SOmar Sandoval 594a5ed9182SOmar Sandoval return btrfs_search_prev_slot(trans, root, &key, p, 0, 1); 595a5ed9182SOmar Sandoval } 596a5ed9182SOmar Sandoval 597a5ed9182SOmar Sandoval /* 598a5ed9182SOmar Sandoval * If remove is 1, then we are removing free space, thus clearing bits in the 599a5ed9182SOmar Sandoval * bitmap. If remove is 0, then we are adding free space, thus setting bits in 600a5ed9182SOmar Sandoval * the bitmap. 601a5ed9182SOmar Sandoval */ 602a5ed9182SOmar Sandoval static int modify_free_space_bitmap(struct btrfs_trans_handle *trans, 60332da5386SDavid Sterba struct btrfs_block_group *block_group, 604a5ed9182SOmar Sandoval struct btrfs_path *path, 605a5ed9182SOmar Sandoval u64 start, u64 size, int remove) 606a5ed9182SOmar Sandoval { 6077939dd9fSJosef Bacik struct btrfs_root *root = btrfs_free_space_root(block_group); 608a5ed9182SOmar Sandoval struct btrfs_key key; 609a5ed9182SOmar Sandoval u64 end = start + size; 610a5ed9182SOmar Sandoval u64 cur_start, cur_size; 611a5ed9182SOmar Sandoval int prev_bit, next_bit; 612a5ed9182SOmar Sandoval int new_extents; 613a5ed9182SOmar Sandoval int ret; 614a5ed9182SOmar Sandoval 615a5ed9182SOmar Sandoval /* 616a5ed9182SOmar Sandoval * Read the bit for the block immediately before the extent of space if 617a5ed9182SOmar Sandoval * that block is within the block group. 618a5ed9182SOmar Sandoval */ 619b3470b5dSDavid Sterba if (start > block_group->start) { 620da17066cSJeff Mahoney u64 prev_block = start - block_group->fs_info->sectorsize; 621a5ed9182SOmar Sandoval 622a5ed9182SOmar Sandoval key.objectid = prev_block; 623a5ed9182SOmar Sandoval key.type = (u8)-1; 624a5ed9182SOmar Sandoval key.offset = (u64)-1; 625a5ed9182SOmar Sandoval 626a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, 0, 1); 627a5ed9182SOmar Sandoval if (ret) 628a5ed9182SOmar Sandoval goto out; 629a5ed9182SOmar Sandoval 630a5ed9182SOmar Sandoval prev_bit = free_space_test_bit(block_group, path, prev_block); 631a5ed9182SOmar Sandoval 632a5ed9182SOmar Sandoval /* The previous block may have been in the previous bitmap. */ 633a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 634a5ed9182SOmar Sandoval if (start >= key.objectid + key.offset) { 635a5ed9182SOmar Sandoval ret = free_space_next_bitmap(trans, root, path); 636a5ed9182SOmar Sandoval if (ret) 637a5ed9182SOmar Sandoval goto out; 638a5ed9182SOmar Sandoval } 639a5ed9182SOmar Sandoval } else { 640a5ed9182SOmar Sandoval key.objectid = start; 641a5ed9182SOmar Sandoval key.type = (u8)-1; 642a5ed9182SOmar Sandoval key.offset = (u64)-1; 643a5ed9182SOmar Sandoval 644a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, 0, 1); 645a5ed9182SOmar Sandoval if (ret) 646a5ed9182SOmar Sandoval goto out; 647a5ed9182SOmar Sandoval 648a5ed9182SOmar Sandoval prev_bit = -1; 649a5ed9182SOmar Sandoval } 650a5ed9182SOmar Sandoval 651a5ed9182SOmar Sandoval /* 652a5ed9182SOmar Sandoval * Iterate over all of the bitmaps overlapped by the extent of space, 653a5ed9182SOmar Sandoval * clearing/setting bits as required. 654a5ed9182SOmar Sandoval */ 655a5ed9182SOmar Sandoval cur_start = start; 656a5ed9182SOmar Sandoval cur_size = size; 657a5ed9182SOmar Sandoval while (1) { 658a5ed9182SOmar Sandoval free_space_set_bits(block_group, path, &cur_start, &cur_size, 659a5ed9182SOmar Sandoval !remove); 660a5ed9182SOmar Sandoval if (cur_size == 0) 661a5ed9182SOmar Sandoval break; 662a5ed9182SOmar Sandoval ret = free_space_next_bitmap(trans, root, path); 663a5ed9182SOmar Sandoval if (ret) 664a5ed9182SOmar Sandoval goto out; 665a5ed9182SOmar Sandoval } 666a5ed9182SOmar Sandoval 667a5ed9182SOmar Sandoval /* 668a5ed9182SOmar Sandoval * Read the bit for the block immediately after the extent of space if 669a5ed9182SOmar Sandoval * that block is within the block group. 670a5ed9182SOmar Sandoval */ 671b3470b5dSDavid Sterba if (end < block_group->start + block_group->length) { 672a5ed9182SOmar Sandoval /* The next block may be in the next bitmap. */ 673a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 674a5ed9182SOmar Sandoval if (end >= key.objectid + key.offset) { 675a5ed9182SOmar Sandoval ret = free_space_next_bitmap(trans, root, path); 676a5ed9182SOmar Sandoval if (ret) 677a5ed9182SOmar Sandoval goto out; 678a5ed9182SOmar Sandoval } 679a5ed9182SOmar Sandoval 680a5ed9182SOmar Sandoval next_bit = free_space_test_bit(block_group, path, end); 681a5ed9182SOmar Sandoval } else { 682a5ed9182SOmar Sandoval next_bit = -1; 683a5ed9182SOmar Sandoval } 684a5ed9182SOmar Sandoval 685a5ed9182SOmar Sandoval if (remove) { 686a5ed9182SOmar Sandoval new_extents = -1; 687a5ed9182SOmar Sandoval if (prev_bit == 1) { 688a5ed9182SOmar Sandoval /* Leftover on the left. */ 689a5ed9182SOmar Sandoval new_extents++; 690a5ed9182SOmar Sandoval } 691a5ed9182SOmar Sandoval if (next_bit == 1) { 692a5ed9182SOmar Sandoval /* Leftover on the right. */ 693a5ed9182SOmar Sandoval new_extents++; 694a5ed9182SOmar Sandoval } 695a5ed9182SOmar Sandoval } else { 696a5ed9182SOmar Sandoval new_extents = 1; 697a5ed9182SOmar Sandoval if (prev_bit == 1) { 698a5ed9182SOmar Sandoval /* Merging with neighbor on the left. */ 699a5ed9182SOmar Sandoval new_extents--; 700a5ed9182SOmar Sandoval } 701a5ed9182SOmar Sandoval if (next_bit == 1) { 702a5ed9182SOmar Sandoval /* Merging with neighbor on the right. */ 703a5ed9182SOmar Sandoval new_extents--; 704a5ed9182SOmar Sandoval } 705a5ed9182SOmar Sandoval } 706a5ed9182SOmar Sandoval 707a5ed9182SOmar Sandoval btrfs_release_path(path); 708690d7682SNikolay Borisov ret = update_free_space_extent_count(trans, block_group, path, 709a5ed9182SOmar Sandoval new_extents); 710a5ed9182SOmar Sandoval 711a5ed9182SOmar Sandoval out: 712a5ed9182SOmar Sandoval return ret; 713a5ed9182SOmar Sandoval } 714a5ed9182SOmar Sandoval 715a5ed9182SOmar Sandoval static int remove_free_space_extent(struct btrfs_trans_handle *trans, 71632da5386SDavid Sterba struct btrfs_block_group *block_group, 717a5ed9182SOmar Sandoval struct btrfs_path *path, 718a5ed9182SOmar Sandoval u64 start, u64 size) 719a5ed9182SOmar Sandoval { 7207939dd9fSJosef Bacik struct btrfs_root *root = btrfs_free_space_root(block_group); 721a5ed9182SOmar Sandoval struct btrfs_key key; 722a5ed9182SOmar Sandoval u64 found_start, found_end; 723a5ed9182SOmar Sandoval u64 end = start + size; 724a5ed9182SOmar Sandoval int new_extents = -1; 725a5ed9182SOmar Sandoval int ret; 726a5ed9182SOmar Sandoval 727a5ed9182SOmar Sandoval key.objectid = start; 728a5ed9182SOmar Sandoval key.type = (u8)-1; 729a5ed9182SOmar Sandoval key.offset = (u64)-1; 730a5ed9182SOmar Sandoval 731a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 732a5ed9182SOmar Sandoval if (ret) 733a5ed9182SOmar Sandoval goto out; 734a5ed9182SOmar Sandoval 735a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 736a5ed9182SOmar Sandoval 737a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_EXTENT_KEY); 738a5ed9182SOmar Sandoval 739a5ed9182SOmar Sandoval found_start = key.objectid; 740a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 741a5ed9182SOmar Sandoval ASSERT(start >= found_start && end <= found_end); 742a5ed9182SOmar Sandoval 743a5ed9182SOmar Sandoval /* 744a5ed9182SOmar Sandoval * Okay, now that we've found the free space extent which contains the 745a5ed9182SOmar Sandoval * free space that we are removing, there are four cases: 746a5ed9182SOmar Sandoval * 747a5ed9182SOmar Sandoval * 1. We're using the whole extent: delete the key we found and 748a5ed9182SOmar Sandoval * decrement the free space extent count. 749a5ed9182SOmar Sandoval * 2. We are using part of the extent starting at the beginning: delete 750a5ed9182SOmar Sandoval * the key we found and insert a new key representing the leftover at 751a5ed9182SOmar Sandoval * the end. There is no net change in the number of extents. 752a5ed9182SOmar Sandoval * 3. We are using part of the extent ending at the end: delete the key 753a5ed9182SOmar Sandoval * we found and insert a new key representing the leftover at the 754a5ed9182SOmar Sandoval * beginning. There is no net change in the number of extents. 755a5ed9182SOmar Sandoval * 4. We are using part of the extent in the middle: delete the key we 756a5ed9182SOmar Sandoval * found and insert two new keys representing the leftovers on each 757a5ed9182SOmar Sandoval * side. Where we used to have one extent, we now have two, so increment 758a5ed9182SOmar Sandoval * the extent count. We may need to convert the block group to bitmaps 759a5ed9182SOmar Sandoval * as a result. 760a5ed9182SOmar Sandoval */ 761a5ed9182SOmar Sandoval 762a5ed9182SOmar Sandoval /* Delete the existing key (cases 1-4). */ 763a5ed9182SOmar Sandoval ret = btrfs_del_item(trans, root, path); 764a5ed9182SOmar Sandoval if (ret) 765a5ed9182SOmar Sandoval goto out; 766a5ed9182SOmar Sandoval 767a5ed9182SOmar Sandoval /* Add a key for leftovers at the beginning (cases 3 and 4). */ 768a5ed9182SOmar Sandoval if (start > found_start) { 769a5ed9182SOmar Sandoval key.objectid = found_start; 770a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_EXTENT_KEY; 771a5ed9182SOmar Sandoval key.offset = start - found_start; 772a5ed9182SOmar Sandoval 773a5ed9182SOmar Sandoval btrfs_release_path(path); 774a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, 0); 775a5ed9182SOmar Sandoval if (ret) 776a5ed9182SOmar Sandoval goto out; 777a5ed9182SOmar Sandoval new_extents++; 778a5ed9182SOmar Sandoval } 779a5ed9182SOmar Sandoval 780a5ed9182SOmar Sandoval /* Add a key for leftovers at the end (cases 2 and 4). */ 781a5ed9182SOmar Sandoval if (end < found_end) { 782a5ed9182SOmar Sandoval key.objectid = end; 783a5ed9182SOmar Sandoval key.type = BTRFS_FREE_SPACE_EXTENT_KEY; 784a5ed9182SOmar Sandoval key.offset = found_end - end; 785a5ed9182SOmar Sandoval 786a5ed9182SOmar Sandoval btrfs_release_path(path); 787a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &key, 0); 788a5ed9182SOmar Sandoval if (ret) 789a5ed9182SOmar Sandoval goto out; 790a5ed9182SOmar Sandoval new_extents++; 791a5ed9182SOmar Sandoval } 792a5ed9182SOmar Sandoval 793a5ed9182SOmar Sandoval btrfs_release_path(path); 794690d7682SNikolay Borisov ret = update_free_space_extent_count(trans, block_group, path, 795a5ed9182SOmar Sandoval new_extents); 796a5ed9182SOmar Sandoval 797a5ed9182SOmar Sandoval out: 798a5ed9182SOmar Sandoval return ret; 799a5ed9182SOmar Sandoval } 800a5ed9182SOmar Sandoval 801ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 802a5ed9182SOmar Sandoval int __remove_from_free_space_tree(struct btrfs_trans_handle *trans, 80332da5386SDavid Sterba struct btrfs_block_group *block_group, 804a5ed9182SOmar Sandoval struct btrfs_path *path, u64 start, u64 size) 805a5ed9182SOmar Sandoval { 806a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 807a5ed9182SOmar Sandoval u32 flags; 808a5ed9182SOmar Sandoval int ret; 809a5ed9182SOmar Sandoval 810a5ed9182SOmar Sandoval if (block_group->needs_free_space) { 8119a7e0f92SNikolay Borisov ret = __add_block_group_free_space(trans, block_group, path); 812a5ed9182SOmar Sandoval if (ret) 813a5ed9182SOmar Sandoval return ret; 814a5ed9182SOmar Sandoval } 815a5ed9182SOmar Sandoval 8162ccf545eSDavid Sterba info = search_free_space_info(NULL, block_group, path, 0); 817a5ed9182SOmar Sandoval if (IS_ERR(info)) 818a5ed9182SOmar Sandoval return PTR_ERR(info); 819a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(path->nodes[0], info); 820a5ed9182SOmar Sandoval btrfs_release_path(path); 821a5ed9182SOmar Sandoval 822a5ed9182SOmar Sandoval if (flags & BTRFS_FREE_SPACE_USING_BITMAPS) { 82385a7ef13SNikolay Borisov return modify_free_space_bitmap(trans, block_group, path, 82485a7ef13SNikolay Borisov start, size, 1); 825a5ed9182SOmar Sandoval } else { 826e581168dSNikolay Borisov return remove_free_space_extent(trans, block_group, path, 827e581168dSNikolay Borisov start, size); 828a5ed9182SOmar Sandoval } 829a5ed9182SOmar Sandoval } 830a5ed9182SOmar Sandoval 831a5ed9182SOmar Sandoval int remove_from_free_space_tree(struct btrfs_trans_handle *trans, 832a5ed9182SOmar Sandoval u64 start, u64 size) 833a5ed9182SOmar Sandoval { 83432da5386SDavid Sterba struct btrfs_block_group *block_group; 835a5ed9182SOmar Sandoval struct btrfs_path *path; 836a5ed9182SOmar Sandoval int ret; 837a5ed9182SOmar Sandoval 83825a356d3SNikolay Borisov if (!btrfs_fs_compat_ro(trans->fs_info, FREE_SPACE_TREE)) 839a5ed9182SOmar Sandoval return 0; 840a5ed9182SOmar Sandoval 841a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 842a5ed9182SOmar Sandoval if (!path) { 843a5ed9182SOmar Sandoval ret = -ENOMEM; 844a5ed9182SOmar Sandoval goto out; 845a5ed9182SOmar Sandoval } 846a5ed9182SOmar Sandoval 84725a356d3SNikolay Borisov block_group = btrfs_lookup_block_group(trans->fs_info, start); 848a5ed9182SOmar Sandoval if (!block_group) { 849a5ed9182SOmar Sandoval ASSERT(0); 850a5ed9182SOmar Sandoval ret = -ENOENT; 851a5ed9182SOmar Sandoval goto out; 852a5ed9182SOmar Sandoval } 853a5ed9182SOmar Sandoval 854a5ed9182SOmar Sandoval mutex_lock(&block_group->free_space_lock); 855c31683a6SNikolay Borisov ret = __remove_from_free_space_tree(trans, block_group, path, start, 856c31683a6SNikolay Borisov size); 857a5ed9182SOmar Sandoval mutex_unlock(&block_group->free_space_lock); 858a5ed9182SOmar Sandoval 859a5ed9182SOmar Sandoval btrfs_put_block_group(block_group); 860a5ed9182SOmar Sandoval out: 861a5ed9182SOmar Sandoval btrfs_free_path(path); 862a5ed9182SOmar Sandoval if (ret) 86366642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 864a5ed9182SOmar Sandoval return ret; 865a5ed9182SOmar Sandoval } 866a5ed9182SOmar Sandoval 867a5ed9182SOmar Sandoval static int add_free_space_extent(struct btrfs_trans_handle *trans, 86832da5386SDavid Sterba struct btrfs_block_group *block_group, 869a5ed9182SOmar Sandoval struct btrfs_path *path, 870a5ed9182SOmar Sandoval u64 start, u64 size) 871a5ed9182SOmar Sandoval { 8727939dd9fSJosef Bacik struct btrfs_root *root = btrfs_free_space_root(block_group); 873a5ed9182SOmar Sandoval struct btrfs_key key, new_key; 874a5ed9182SOmar Sandoval u64 found_start, found_end; 875a5ed9182SOmar Sandoval u64 end = start + size; 876a5ed9182SOmar Sandoval int new_extents = 1; 877a5ed9182SOmar Sandoval int ret; 878a5ed9182SOmar Sandoval 879a5ed9182SOmar Sandoval /* 880a5ed9182SOmar Sandoval * We are adding a new extent of free space, but we need to merge 881a5ed9182SOmar Sandoval * extents. There are four cases here: 882a5ed9182SOmar Sandoval * 883a5ed9182SOmar Sandoval * 1. The new extent does not have any immediate neighbors to merge 884a5ed9182SOmar Sandoval * with: add the new key and increment the free space extent count. We 885a5ed9182SOmar Sandoval * may need to convert the block group to bitmaps as a result. 886a5ed9182SOmar Sandoval * 2. The new extent has an immediate neighbor before it: remove the 887a5ed9182SOmar Sandoval * previous key and insert a new key combining both of them. There is no 888a5ed9182SOmar Sandoval * net change in the number of extents. 889a5ed9182SOmar Sandoval * 3. The new extent has an immediate neighbor after it: remove the next 890a5ed9182SOmar Sandoval * key and insert a new key combining both of them. There is no net 891a5ed9182SOmar Sandoval * change in the number of extents. 892a5ed9182SOmar Sandoval * 4. The new extent has immediate neighbors on both sides: remove both 893a5ed9182SOmar Sandoval * of the keys and insert a new key combining all of them. Where we used 894a5ed9182SOmar Sandoval * to have two extents, we now have one, so decrement the extent count. 895a5ed9182SOmar Sandoval */ 896a5ed9182SOmar Sandoval 897a5ed9182SOmar Sandoval new_key.objectid = start; 898a5ed9182SOmar Sandoval new_key.type = BTRFS_FREE_SPACE_EXTENT_KEY; 899a5ed9182SOmar Sandoval new_key.offset = size; 900a5ed9182SOmar Sandoval 901a5ed9182SOmar Sandoval /* Search for a neighbor on the left. */ 902b3470b5dSDavid Sterba if (start == block_group->start) 903a5ed9182SOmar Sandoval goto right; 904a5ed9182SOmar Sandoval key.objectid = start - 1; 905a5ed9182SOmar Sandoval key.type = (u8)-1; 906a5ed9182SOmar Sandoval key.offset = (u64)-1; 907a5ed9182SOmar Sandoval 908a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 909a5ed9182SOmar Sandoval if (ret) 910a5ed9182SOmar Sandoval goto out; 911a5ed9182SOmar Sandoval 912a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 913a5ed9182SOmar Sandoval 914a5ed9182SOmar Sandoval if (key.type != BTRFS_FREE_SPACE_EXTENT_KEY) { 915a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_INFO_KEY); 916a5ed9182SOmar Sandoval btrfs_release_path(path); 917a5ed9182SOmar Sandoval goto right; 918a5ed9182SOmar Sandoval } 919a5ed9182SOmar Sandoval 920a5ed9182SOmar Sandoval found_start = key.objectid; 921a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 922b3470b5dSDavid Sterba ASSERT(found_start >= block_group->start && 923b3470b5dSDavid Sterba found_end > block_group->start); 924a5ed9182SOmar Sandoval ASSERT(found_start < start && found_end <= start); 925a5ed9182SOmar Sandoval 926a5ed9182SOmar Sandoval /* 927a5ed9182SOmar Sandoval * Delete the neighbor on the left and absorb it into the new key (cases 928a5ed9182SOmar Sandoval * 2 and 4). 929a5ed9182SOmar Sandoval */ 930a5ed9182SOmar Sandoval if (found_end == start) { 931a5ed9182SOmar Sandoval ret = btrfs_del_item(trans, root, path); 932a5ed9182SOmar Sandoval if (ret) 933a5ed9182SOmar Sandoval goto out; 934a5ed9182SOmar Sandoval new_key.objectid = found_start; 935a5ed9182SOmar Sandoval new_key.offset += key.offset; 936a5ed9182SOmar Sandoval new_extents--; 937a5ed9182SOmar Sandoval } 938a5ed9182SOmar Sandoval btrfs_release_path(path); 939a5ed9182SOmar Sandoval 940a5ed9182SOmar Sandoval right: 941a5ed9182SOmar Sandoval /* Search for a neighbor on the right. */ 942b3470b5dSDavid Sterba if (end == block_group->start + block_group->length) 943a5ed9182SOmar Sandoval goto insert; 944a5ed9182SOmar Sandoval key.objectid = end; 945a5ed9182SOmar Sandoval key.type = (u8)-1; 946a5ed9182SOmar Sandoval key.offset = (u64)-1; 947a5ed9182SOmar Sandoval 948a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 949a5ed9182SOmar Sandoval if (ret) 950a5ed9182SOmar Sandoval goto out; 951a5ed9182SOmar Sandoval 952a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 953a5ed9182SOmar Sandoval 954a5ed9182SOmar Sandoval if (key.type != BTRFS_FREE_SPACE_EXTENT_KEY) { 955a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_INFO_KEY); 956a5ed9182SOmar Sandoval btrfs_release_path(path); 957a5ed9182SOmar Sandoval goto insert; 958a5ed9182SOmar Sandoval } 959a5ed9182SOmar Sandoval 960a5ed9182SOmar Sandoval found_start = key.objectid; 961a5ed9182SOmar Sandoval found_end = key.objectid + key.offset; 962b3470b5dSDavid Sterba ASSERT(found_start >= block_group->start && 963b3470b5dSDavid Sterba found_end > block_group->start); 964a5ed9182SOmar Sandoval ASSERT((found_start < start && found_end <= start) || 965a5ed9182SOmar Sandoval (found_start >= end && found_end > end)); 966a5ed9182SOmar Sandoval 967a5ed9182SOmar Sandoval /* 968a5ed9182SOmar Sandoval * Delete the neighbor on the right and absorb it into the new key 969a5ed9182SOmar Sandoval * (cases 3 and 4). 970a5ed9182SOmar Sandoval */ 971a5ed9182SOmar Sandoval if (found_start == end) { 972a5ed9182SOmar Sandoval ret = btrfs_del_item(trans, root, path); 973a5ed9182SOmar Sandoval if (ret) 974a5ed9182SOmar Sandoval goto out; 975a5ed9182SOmar Sandoval new_key.offset += key.offset; 976a5ed9182SOmar Sandoval new_extents--; 977a5ed9182SOmar Sandoval } 978a5ed9182SOmar Sandoval btrfs_release_path(path); 979a5ed9182SOmar Sandoval 980a5ed9182SOmar Sandoval insert: 981a5ed9182SOmar Sandoval /* Insert the new key (cases 1-4). */ 982a5ed9182SOmar Sandoval ret = btrfs_insert_empty_item(trans, root, path, &new_key, 0); 983a5ed9182SOmar Sandoval if (ret) 984a5ed9182SOmar Sandoval goto out; 985a5ed9182SOmar Sandoval 986a5ed9182SOmar Sandoval btrfs_release_path(path); 987690d7682SNikolay Borisov ret = update_free_space_extent_count(trans, block_group, path, 988a5ed9182SOmar Sandoval new_extents); 989a5ed9182SOmar Sandoval 990a5ed9182SOmar Sandoval out: 991a5ed9182SOmar Sandoval return ret; 992a5ed9182SOmar Sandoval } 993a5ed9182SOmar Sandoval 994ce9f967fSJohannes Thumshirn EXPORT_FOR_TESTS 995a5ed9182SOmar Sandoval int __add_to_free_space_tree(struct btrfs_trans_handle *trans, 99632da5386SDavid Sterba struct btrfs_block_group *block_group, 997a5ed9182SOmar Sandoval struct btrfs_path *path, u64 start, u64 size) 998a5ed9182SOmar Sandoval { 999a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 1000a5ed9182SOmar Sandoval u32 flags; 1001a5ed9182SOmar Sandoval int ret; 1002a5ed9182SOmar Sandoval 1003a5ed9182SOmar Sandoval if (block_group->needs_free_space) { 10049a7e0f92SNikolay Borisov ret = __add_block_group_free_space(trans, block_group, path); 1005a5ed9182SOmar Sandoval if (ret) 1006a5ed9182SOmar Sandoval return ret; 1007a5ed9182SOmar Sandoval } 1008a5ed9182SOmar Sandoval 10092ccf545eSDavid Sterba info = search_free_space_info(NULL, block_group, path, 0); 1010a5ed9182SOmar Sandoval if (IS_ERR(info)) 1011a5ed9182SOmar Sandoval return PTR_ERR(info); 1012a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(path->nodes[0], info); 1013a5ed9182SOmar Sandoval btrfs_release_path(path); 1014a5ed9182SOmar Sandoval 1015a5ed9182SOmar Sandoval if (flags & BTRFS_FREE_SPACE_USING_BITMAPS) { 101685a7ef13SNikolay Borisov return modify_free_space_bitmap(trans, block_group, path, 101785a7ef13SNikolay Borisov start, size, 0); 1018a5ed9182SOmar Sandoval } else { 10195cb17822SNikolay Borisov return add_free_space_extent(trans, block_group, path, start, 10205cb17822SNikolay Borisov size); 1021a5ed9182SOmar Sandoval } 1022a5ed9182SOmar Sandoval } 1023a5ed9182SOmar Sandoval 1024a5ed9182SOmar Sandoval int add_to_free_space_tree(struct btrfs_trans_handle *trans, 1025a5ed9182SOmar Sandoval u64 start, u64 size) 1026a5ed9182SOmar Sandoval { 102732da5386SDavid Sterba struct btrfs_block_group *block_group; 1028a5ed9182SOmar Sandoval struct btrfs_path *path; 1029a5ed9182SOmar Sandoval int ret; 1030a5ed9182SOmar Sandoval 1031e7355e50SNikolay Borisov if (!btrfs_fs_compat_ro(trans->fs_info, FREE_SPACE_TREE)) 1032a5ed9182SOmar Sandoval return 0; 1033a5ed9182SOmar Sandoval 1034a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1035a5ed9182SOmar Sandoval if (!path) { 1036a5ed9182SOmar Sandoval ret = -ENOMEM; 1037a5ed9182SOmar Sandoval goto out; 1038a5ed9182SOmar Sandoval } 1039a5ed9182SOmar Sandoval 1040e7355e50SNikolay Borisov block_group = btrfs_lookup_block_group(trans->fs_info, start); 1041a5ed9182SOmar Sandoval if (!block_group) { 1042a5ed9182SOmar Sandoval ASSERT(0); 1043a5ed9182SOmar Sandoval ret = -ENOENT; 1044a5ed9182SOmar Sandoval goto out; 1045a5ed9182SOmar Sandoval } 1046a5ed9182SOmar Sandoval 1047a5ed9182SOmar Sandoval mutex_lock(&block_group->free_space_lock); 10482d5cffa1SNikolay Borisov ret = __add_to_free_space_tree(trans, block_group, path, start, size); 1049a5ed9182SOmar Sandoval mutex_unlock(&block_group->free_space_lock); 1050a5ed9182SOmar Sandoval 1051a5ed9182SOmar Sandoval btrfs_put_block_group(block_group); 1052a5ed9182SOmar Sandoval out: 1053a5ed9182SOmar Sandoval btrfs_free_path(path); 1054a5ed9182SOmar Sandoval if (ret) 105566642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 1056a5ed9182SOmar Sandoval return ret; 1057a5ed9182SOmar Sandoval } 1058a5ed9182SOmar Sandoval 1059a5ed9182SOmar Sandoval /* 1060a5ed9182SOmar Sandoval * Populate the free space tree by walking the extent tree. Operations on the 1061a5ed9182SOmar Sandoval * extent tree that happen as a result of writes to the free space tree will go 1062a5ed9182SOmar Sandoval * through the normal add/remove hooks. 1063a5ed9182SOmar Sandoval */ 1064a5ed9182SOmar Sandoval static int populate_free_space_tree(struct btrfs_trans_handle *trans, 106532da5386SDavid Sterba struct btrfs_block_group *block_group) 1066a5ed9182SOmar Sandoval { 106729cbcf40SJosef Bacik struct btrfs_root *extent_root; 1068a5ed9182SOmar Sandoval struct btrfs_path *path, *path2; 1069a5ed9182SOmar Sandoval struct btrfs_key key; 1070a5ed9182SOmar Sandoval u64 start, end; 1071a5ed9182SOmar Sandoval int ret; 1072a5ed9182SOmar Sandoval 1073a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1074a5ed9182SOmar Sandoval if (!path) 1075a5ed9182SOmar Sandoval return -ENOMEM; 1076019599adSGu Jinxiang path->reada = READA_FORWARD; 1077a5ed9182SOmar Sandoval 1078a5ed9182SOmar Sandoval path2 = btrfs_alloc_path(); 1079a5ed9182SOmar Sandoval if (!path2) { 1080a5ed9182SOmar Sandoval btrfs_free_path(path); 1081a5ed9182SOmar Sandoval return -ENOMEM; 1082a5ed9182SOmar Sandoval } 1083a5ed9182SOmar Sandoval 108466afee18SNikolay Borisov ret = add_new_free_space_info(trans, block_group, path2); 1085a5ed9182SOmar Sandoval if (ret) 1086a5ed9182SOmar Sandoval goto out; 1087a5ed9182SOmar Sandoval 1088511711afSChris Mason mutex_lock(&block_group->free_space_lock); 1089511711afSChris Mason 1090a5ed9182SOmar Sandoval /* 1091a5ed9182SOmar Sandoval * Iterate through all of the extent and metadata items in this block 1092a5ed9182SOmar Sandoval * group, adding the free space between them and the free space at the 1093a5ed9182SOmar Sandoval * end. Note that EXTENT_ITEM and METADATA_ITEM are less than 1094a5ed9182SOmar Sandoval * BLOCK_GROUP_ITEM, so an extent may precede the block group that it's 1095a5ed9182SOmar Sandoval * contained in. 1096a5ed9182SOmar Sandoval */ 1097b3470b5dSDavid Sterba key.objectid = block_group->start; 1098a5ed9182SOmar Sandoval key.type = BTRFS_EXTENT_ITEM_KEY; 1099a5ed9182SOmar Sandoval key.offset = 0; 1100a5ed9182SOmar Sandoval 110129cbcf40SJosef Bacik extent_root = btrfs_extent_root(trans->fs_info, key.objectid); 1102a5ed9182SOmar Sandoval ret = btrfs_search_slot_for_read(extent_root, &key, path, 1, 0); 1103a5ed9182SOmar Sandoval if (ret < 0) 1104511711afSChris Mason goto out_locked; 1105a5ed9182SOmar Sandoval ASSERT(ret == 0); 1106a5ed9182SOmar Sandoval 1107b3470b5dSDavid Sterba start = block_group->start; 1108b3470b5dSDavid Sterba end = block_group->start + block_group->length; 1109a5ed9182SOmar Sandoval while (1) { 1110a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 1111a5ed9182SOmar Sandoval 1112a5ed9182SOmar Sandoval if (key.type == BTRFS_EXTENT_ITEM_KEY || 1113a5ed9182SOmar Sandoval key.type == BTRFS_METADATA_ITEM_KEY) { 1114a5ed9182SOmar Sandoval if (key.objectid >= end) 1115a5ed9182SOmar Sandoval break; 1116a5ed9182SOmar Sandoval 1117a5ed9182SOmar Sandoval if (start < key.objectid) { 11182d5cffa1SNikolay Borisov ret = __add_to_free_space_tree(trans, 1119a5ed9182SOmar Sandoval block_group, 1120a5ed9182SOmar Sandoval path2, start, 1121a5ed9182SOmar Sandoval key.objectid - 1122a5ed9182SOmar Sandoval start); 1123a5ed9182SOmar Sandoval if (ret) 1124511711afSChris Mason goto out_locked; 1125a5ed9182SOmar Sandoval } 1126a5ed9182SOmar Sandoval start = key.objectid; 1127a5ed9182SOmar Sandoval if (key.type == BTRFS_METADATA_ITEM_KEY) 1128ffa9a9efSNikolay Borisov start += trans->fs_info->nodesize; 1129a5ed9182SOmar Sandoval else 1130a5ed9182SOmar Sandoval start += key.offset; 1131a5ed9182SOmar Sandoval } else if (key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { 1132b3470b5dSDavid Sterba if (key.objectid != block_group->start) 1133a5ed9182SOmar Sandoval break; 1134a5ed9182SOmar Sandoval } 1135a5ed9182SOmar Sandoval 1136a5ed9182SOmar Sandoval ret = btrfs_next_item(extent_root, path); 1137a5ed9182SOmar Sandoval if (ret < 0) 1138511711afSChris Mason goto out_locked; 1139a5ed9182SOmar Sandoval if (ret) 1140a5ed9182SOmar Sandoval break; 1141a5ed9182SOmar Sandoval } 1142a5ed9182SOmar Sandoval if (start < end) { 11432d5cffa1SNikolay Borisov ret = __add_to_free_space_tree(trans, block_group, path2, 11442d5cffa1SNikolay Borisov start, end - start); 1145a5ed9182SOmar Sandoval if (ret) 1146511711afSChris Mason goto out_locked; 1147a5ed9182SOmar Sandoval } 1148a5ed9182SOmar Sandoval 1149a5ed9182SOmar Sandoval ret = 0; 1150511711afSChris Mason out_locked: 1151511711afSChris Mason mutex_unlock(&block_group->free_space_lock); 1152a5ed9182SOmar Sandoval out: 1153a5ed9182SOmar Sandoval btrfs_free_path(path2); 1154a5ed9182SOmar Sandoval btrfs_free_path(path); 1155a5ed9182SOmar Sandoval return ret; 1156a5ed9182SOmar Sandoval } 1157a5ed9182SOmar Sandoval 1158a5ed9182SOmar Sandoval int btrfs_create_free_space_tree(struct btrfs_fs_info *fs_info) 1159a5ed9182SOmar Sandoval { 1160a5ed9182SOmar Sandoval struct btrfs_trans_handle *trans; 1161a5ed9182SOmar Sandoval struct btrfs_root *tree_root = fs_info->tree_root; 1162a5ed9182SOmar Sandoval struct btrfs_root *free_space_root; 116332da5386SDavid Sterba struct btrfs_block_group *block_group; 1164a5ed9182SOmar Sandoval struct rb_node *node; 1165a5ed9182SOmar Sandoval int ret; 1166a5ed9182SOmar Sandoval 1167a5ed9182SOmar Sandoval trans = btrfs_start_transaction(tree_root, 0); 1168a5ed9182SOmar Sandoval if (IS_ERR(trans)) 1169a5ed9182SOmar Sandoval return PTR_ERR(trans); 1170a5ed9182SOmar Sandoval 1171afcdd129SJosef Bacik set_bit(BTRFS_FS_CREATING_FREE_SPACE_TREE, &fs_info->flags); 11722f96e402SJosef Bacik set_bit(BTRFS_FS_FREE_SPACE_TREE_UNTRUSTED, &fs_info->flags); 11739b7a2440SDavid Sterba free_space_root = btrfs_create_tree(trans, 1174a5ed9182SOmar Sandoval BTRFS_FREE_SPACE_TREE_OBJECTID); 1175a5ed9182SOmar Sandoval if (IS_ERR(free_space_root)) { 1176a5ed9182SOmar Sandoval ret = PTR_ERR(free_space_root); 1177a5ed9182SOmar Sandoval goto abort; 1178a5ed9182SOmar Sandoval } 1179abed4aaaSJosef Bacik ret = btrfs_global_root_insert(free_space_root); 1180abed4aaaSJosef Bacik if (ret) { 1181abed4aaaSJosef Bacik btrfs_put_root(free_space_root); 1182abed4aaaSJosef Bacik goto abort; 1183abed4aaaSJosef Bacik } 1184a5ed9182SOmar Sandoval 118508dddb29SFilipe Manana node = rb_first_cached(&fs_info->block_group_cache_tree); 1186a5ed9182SOmar Sandoval while (node) { 118732da5386SDavid Sterba block_group = rb_entry(node, struct btrfs_block_group, 1188a5ed9182SOmar Sandoval cache_node); 1189ffa9a9efSNikolay Borisov ret = populate_free_space_tree(trans, block_group); 1190a5ed9182SOmar Sandoval if (ret) 1191a5ed9182SOmar Sandoval goto abort; 1192a5ed9182SOmar Sandoval node = rb_next(node); 1193a5ed9182SOmar Sandoval } 1194a5ed9182SOmar Sandoval 1195a5ed9182SOmar Sandoval btrfs_set_fs_compat_ro(fs_info, FREE_SPACE_TREE); 11966675df31SOmar Sandoval btrfs_set_fs_compat_ro(fs_info, FREE_SPACE_TREE_VALID); 1197afcdd129SJosef Bacik clear_bit(BTRFS_FS_CREATING_FREE_SPACE_TREE, &fs_info->flags); 11982f96e402SJosef Bacik ret = btrfs_commit_transaction(trans); 1199a5ed9182SOmar Sandoval 12002f96e402SJosef Bacik /* 12012f96e402SJosef Bacik * Now that we've committed the transaction any reading of our commit 12022f96e402SJosef Bacik * root will be safe, so we can cache from the free space tree now. 12032f96e402SJosef Bacik */ 12042f96e402SJosef Bacik clear_bit(BTRFS_FS_FREE_SPACE_TREE_UNTRUSTED, &fs_info->flags); 12052f96e402SJosef Bacik return ret; 1206a5ed9182SOmar Sandoval 1207a5ed9182SOmar Sandoval abort: 1208afcdd129SJosef Bacik clear_bit(BTRFS_FS_CREATING_FREE_SPACE_TREE, &fs_info->flags); 12092f96e402SJosef Bacik clear_bit(BTRFS_FS_FREE_SPACE_TREE_UNTRUSTED, &fs_info->flags); 121066642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 12113a45bb20SJeff Mahoney btrfs_end_transaction(trans); 1212a5ed9182SOmar Sandoval return ret; 1213a5ed9182SOmar Sandoval } 1214a5ed9182SOmar Sandoval 1215a5ed9182SOmar Sandoval static int clear_free_space_tree(struct btrfs_trans_handle *trans, 1216a5ed9182SOmar Sandoval struct btrfs_root *root) 1217a5ed9182SOmar Sandoval { 1218a5ed9182SOmar Sandoval struct btrfs_path *path; 1219a5ed9182SOmar Sandoval struct btrfs_key key; 1220a5ed9182SOmar Sandoval int nr; 1221a5ed9182SOmar Sandoval int ret; 1222a5ed9182SOmar Sandoval 1223a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1224a5ed9182SOmar Sandoval if (!path) 1225a5ed9182SOmar Sandoval return -ENOMEM; 1226a5ed9182SOmar Sandoval 1227a5ed9182SOmar Sandoval key.objectid = 0; 1228a5ed9182SOmar Sandoval key.type = 0; 1229a5ed9182SOmar Sandoval key.offset = 0; 1230a5ed9182SOmar Sandoval 1231a5ed9182SOmar Sandoval while (1) { 1232a5ed9182SOmar Sandoval ret = btrfs_search_slot(trans, root, &key, path, -1, 1); 1233a5ed9182SOmar Sandoval if (ret < 0) 1234a5ed9182SOmar Sandoval goto out; 1235a5ed9182SOmar Sandoval 1236a5ed9182SOmar Sandoval nr = btrfs_header_nritems(path->nodes[0]); 1237a5ed9182SOmar Sandoval if (!nr) 1238a5ed9182SOmar Sandoval break; 1239a5ed9182SOmar Sandoval 1240a5ed9182SOmar Sandoval path->slots[0] = 0; 1241a5ed9182SOmar Sandoval ret = btrfs_del_items(trans, root, path, 0, nr); 1242a5ed9182SOmar Sandoval if (ret) 1243a5ed9182SOmar Sandoval goto out; 1244a5ed9182SOmar Sandoval 1245a5ed9182SOmar Sandoval btrfs_release_path(path); 1246a5ed9182SOmar Sandoval } 1247a5ed9182SOmar Sandoval 1248a5ed9182SOmar Sandoval ret = 0; 1249a5ed9182SOmar Sandoval out: 1250a5ed9182SOmar Sandoval btrfs_free_path(path); 1251a5ed9182SOmar Sandoval return ret; 1252a5ed9182SOmar Sandoval } 1253a5ed9182SOmar Sandoval 1254a5ed9182SOmar Sandoval int btrfs_clear_free_space_tree(struct btrfs_fs_info *fs_info) 1255a5ed9182SOmar Sandoval { 1256a5ed9182SOmar Sandoval struct btrfs_trans_handle *trans; 1257a5ed9182SOmar Sandoval struct btrfs_root *tree_root = fs_info->tree_root; 1258abed4aaaSJosef Bacik struct btrfs_key key = { 1259abed4aaaSJosef Bacik .objectid = BTRFS_FREE_SPACE_TREE_OBJECTID, 1260abed4aaaSJosef Bacik .type = BTRFS_ROOT_ITEM_KEY, 1261abed4aaaSJosef Bacik .offset = 0, 1262abed4aaaSJosef Bacik }; 1263abed4aaaSJosef Bacik struct btrfs_root *free_space_root = btrfs_global_root(fs_info, &key); 1264a5ed9182SOmar Sandoval int ret; 1265a5ed9182SOmar Sandoval 1266a5ed9182SOmar Sandoval trans = btrfs_start_transaction(tree_root, 0); 1267a5ed9182SOmar Sandoval if (IS_ERR(trans)) 1268a5ed9182SOmar Sandoval return PTR_ERR(trans); 1269a5ed9182SOmar Sandoval 1270a5ed9182SOmar Sandoval btrfs_clear_fs_compat_ro(fs_info, FREE_SPACE_TREE); 12716675df31SOmar Sandoval btrfs_clear_fs_compat_ro(fs_info, FREE_SPACE_TREE_VALID); 1272a5ed9182SOmar Sandoval 1273a5ed9182SOmar Sandoval ret = clear_free_space_tree(trans, free_space_root); 1274a5ed9182SOmar Sandoval if (ret) 1275a5ed9182SOmar Sandoval goto abort; 1276a5ed9182SOmar Sandoval 1277ab9ce7d4SLu Fengqi ret = btrfs_del_root(trans, &free_space_root->root_key); 1278a5ed9182SOmar Sandoval if (ret) 1279a5ed9182SOmar Sandoval goto abort; 1280a5ed9182SOmar Sandoval 1281abed4aaaSJosef Bacik btrfs_global_root_delete(free_space_root); 1282a5ed9182SOmar Sandoval list_del(&free_space_root->dirty_list); 1283a5ed9182SOmar Sandoval 1284a5ed9182SOmar Sandoval btrfs_tree_lock(free_space_root->node); 12856a884d7dSDavid Sterba btrfs_clean_tree_block(free_space_root->node); 1286a5ed9182SOmar Sandoval btrfs_tree_unlock(free_space_root->node); 12877a163608SFilipe Manana btrfs_free_tree_block(trans, btrfs_root_id(free_space_root), 12887a163608SFilipe Manana free_space_root->node, 0, 1); 1289a5ed9182SOmar Sandoval 129000246528SJosef Bacik btrfs_put_root(free_space_root); 1291a5ed9182SOmar Sandoval 12920bef7109SSahil Kang return btrfs_commit_transaction(trans); 1293a5ed9182SOmar Sandoval 1294a5ed9182SOmar Sandoval abort: 129566642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 12963a45bb20SJeff Mahoney btrfs_end_transaction(trans); 1297a5ed9182SOmar Sandoval return ret; 1298a5ed9182SOmar Sandoval } 1299a5ed9182SOmar Sandoval 1300a5ed9182SOmar Sandoval static int __add_block_group_free_space(struct btrfs_trans_handle *trans, 130132da5386SDavid Sterba struct btrfs_block_group *block_group, 1302a5ed9182SOmar Sandoval struct btrfs_path *path) 1303a5ed9182SOmar Sandoval { 1304a5ed9182SOmar Sandoval int ret; 1305a5ed9182SOmar Sandoval 1306a5ed9182SOmar Sandoval block_group->needs_free_space = 0; 1307a5ed9182SOmar Sandoval 130866afee18SNikolay Borisov ret = add_new_free_space_info(trans, block_group, path); 1309a5ed9182SOmar Sandoval if (ret) 1310a5ed9182SOmar Sandoval return ret; 1311a5ed9182SOmar Sandoval 13122d5cffa1SNikolay Borisov return __add_to_free_space_tree(trans, block_group, path, 1313b3470b5dSDavid Sterba block_group->start, 1314b3470b5dSDavid Sterba block_group->length); 1315a5ed9182SOmar Sandoval } 1316a5ed9182SOmar Sandoval 1317a5ed9182SOmar Sandoval int add_block_group_free_space(struct btrfs_trans_handle *trans, 131832da5386SDavid Sterba struct btrfs_block_group *block_group) 1319a5ed9182SOmar Sandoval { 1320e4e0711cSNikolay Borisov struct btrfs_fs_info *fs_info = trans->fs_info; 1321a5ed9182SOmar Sandoval struct btrfs_path *path = NULL; 1322a5ed9182SOmar Sandoval int ret = 0; 1323a5ed9182SOmar Sandoval 1324a5ed9182SOmar Sandoval if (!btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) 1325a5ed9182SOmar Sandoval return 0; 1326a5ed9182SOmar Sandoval 1327a5ed9182SOmar Sandoval mutex_lock(&block_group->free_space_lock); 1328a5ed9182SOmar Sandoval if (!block_group->needs_free_space) 1329a5ed9182SOmar Sandoval goto out; 1330a5ed9182SOmar Sandoval 1331a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1332a5ed9182SOmar Sandoval if (!path) { 1333a5ed9182SOmar Sandoval ret = -ENOMEM; 1334a5ed9182SOmar Sandoval goto out; 1335a5ed9182SOmar Sandoval } 1336a5ed9182SOmar Sandoval 13379a7e0f92SNikolay Borisov ret = __add_block_group_free_space(trans, block_group, path); 1338a5ed9182SOmar Sandoval 1339a5ed9182SOmar Sandoval out: 1340a5ed9182SOmar Sandoval btrfs_free_path(path); 1341a5ed9182SOmar Sandoval mutex_unlock(&block_group->free_space_lock); 1342a5ed9182SOmar Sandoval if (ret) 134366642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 1344a5ed9182SOmar Sandoval return ret; 1345a5ed9182SOmar Sandoval } 1346a5ed9182SOmar Sandoval 1347a5ed9182SOmar Sandoval int remove_block_group_free_space(struct btrfs_trans_handle *trans, 134832da5386SDavid Sterba struct btrfs_block_group *block_group) 1349a5ed9182SOmar Sandoval { 13507939dd9fSJosef Bacik struct btrfs_root *root = btrfs_free_space_root(block_group); 1351a5ed9182SOmar Sandoval struct btrfs_path *path; 1352a5ed9182SOmar Sandoval struct btrfs_key key, found_key; 1353a5ed9182SOmar Sandoval struct extent_buffer *leaf; 1354a5ed9182SOmar Sandoval u64 start, end; 1355a5ed9182SOmar Sandoval int done = 0, nr; 1356a5ed9182SOmar Sandoval int ret; 1357a5ed9182SOmar Sandoval 1358f3f72779SNikolay Borisov if (!btrfs_fs_compat_ro(trans->fs_info, FREE_SPACE_TREE)) 1359a5ed9182SOmar Sandoval return 0; 1360a5ed9182SOmar Sandoval 1361a5ed9182SOmar Sandoval if (block_group->needs_free_space) { 1362a5ed9182SOmar Sandoval /* We never added this block group to the free space tree. */ 1363a5ed9182SOmar Sandoval return 0; 1364a5ed9182SOmar Sandoval } 1365a5ed9182SOmar Sandoval 1366a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1367a5ed9182SOmar Sandoval if (!path) { 1368a5ed9182SOmar Sandoval ret = -ENOMEM; 1369a5ed9182SOmar Sandoval goto out; 1370a5ed9182SOmar Sandoval } 1371a5ed9182SOmar Sandoval 1372b3470b5dSDavid Sterba start = block_group->start; 1373b3470b5dSDavid Sterba end = block_group->start + block_group->length; 1374a5ed9182SOmar Sandoval 1375a5ed9182SOmar Sandoval key.objectid = end - 1; 1376a5ed9182SOmar Sandoval key.type = (u8)-1; 1377a5ed9182SOmar Sandoval key.offset = (u64)-1; 1378a5ed9182SOmar Sandoval 1379a5ed9182SOmar Sandoval while (!done) { 1380a5ed9182SOmar Sandoval ret = btrfs_search_prev_slot(trans, root, &key, path, -1, 1); 1381a5ed9182SOmar Sandoval if (ret) 1382a5ed9182SOmar Sandoval goto out; 1383a5ed9182SOmar Sandoval 1384a5ed9182SOmar Sandoval leaf = path->nodes[0]; 1385a5ed9182SOmar Sandoval nr = 0; 1386a5ed9182SOmar Sandoval path->slots[0]++; 1387a5ed9182SOmar Sandoval while (path->slots[0] > 0) { 1388a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0] - 1); 1389a5ed9182SOmar Sandoval 1390a5ed9182SOmar Sandoval if (found_key.type == BTRFS_FREE_SPACE_INFO_KEY) { 1391b3470b5dSDavid Sterba ASSERT(found_key.objectid == block_group->start); 1392b3470b5dSDavid Sterba ASSERT(found_key.offset == block_group->length); 1393a5ed9182SOmar Sandoval done = 1; 1394a5ed9182SOmar Sandoval nr++; 1395a5ed9182SOmar Sandoval path->slots[0]--; 1396a5ed9182SOmar Sandoval break; 1397a5ed9182SOmar Sandoval } else if (found_key.type == BTRFS_FREE_SPACE_EXTENT_KEY || 1398a5ed9182SOmar Sandoval found_key.type == BTRFS_FREE_SPACE_BITMAP_KEY) { 1399a5ed9182SOmar Sandoval ASSERT(found_key.objectid >= start); 1400a5ed9182SOmar Sandoval ASSERT(found_key.objectid < end); 1401a5ed9182SOmar Sandoval ASSERT(found_key.objectid + found_key.offset <= end); 1402a5ed9182SOmar Sandoval nr++; 1403a5ed9182SOmar Sandoval path->slots[0]--; 1404a5ed9182SOmar Sandoval } else { 1405a5ed9182SOmar Sandoval ASSERT(0); 1406a5ed9182SOmar Sandoval } 1407a5ed9182SOmar Sandoval } 1408a5ed9182SOmar Sandoval 1409a5ed9182SOmar Sandoval ret = btrfs_del_items(trans, root, path, path->slots[0], nr); 1410a5ed9182SOmar Sandoval if (ret) 1411a5ed9182SOmar Sandoval goto out; 1412a5ed9182SOmar Sandoval btrfs_release_path(path); 1413a5ed9182SOmar Sandoval } 1414a5ed9182SOmar Sandoval 1415a5ed9182SOmar Sandoval ret = 0; 1416a5ed9182SOmar Sandoval out: 1417a5ed9182SOmar Sandoval btrfs_free_path(path); 1418a5ed9182SOmar Sandoval if (ret) 141966642832SJeff Mahoney btrfs_abort_transaction(trans, ret); 1420a5ed9182SOmar Sandoval return ret; 1421a5ed9182SOmar Sandoval } 1422a5ed9182SOmar Sandoval 1423a5ed9182SOmar Sandoval static int load_free_space_bitmaps(struct btrfs_caching_control *caching_ctl, 1424a5ed9182SOmar Sandoval struct btrfs_path *path, 1425a5ed9182SOmar Sandoval u32 expected_extent_count) 1426a5ed9182SOmar Sandoval { 142732da5386SDavid Sterba struct btrfs_block_group *block_group; 1428a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info; 1429a5ed9182SOmar Sandoval struct btrfs_root *root; 1430a5ed9182SOmar Sandoval struct btrfs_key key; 1431a5ed9182SOmar Sandoval int prev_bit = 0, bit; 1432a5ed9182SOmar Sandoval /* Initialize to silence GCC. */ 1433a5ed9182SOmar Sandoval u64 extent_start = 0; 1434a5ed9182SOmar Sandoval u64 end, offset; 1435a5ed9182SOmar Sandoval u64 total_found = 0; 1436a5ed9182SOmar Sandoval u32 extent_count = 0; 1437a5ed9182SOmar Sandoval int ret; 1438a5ed9182SOmar Sandoval 1439a5ed9182SOmar Sandoval block_group = caching_ctl->block_group; 1440a5ed9182SOmar Sandoval fs_info = block_group->fs_info; 14417939dd9fSJosef Bacik root = btrfs_free_space_root(block_group); 1442a5ed9182SOmar Sandoval 1443b3470b5dSDavid Sterba end = block_group->start + block_group->length; 1444a5ed9182SOmar Sandoval 1445a5ed9182SOmar Sandoval while (1) { 1446a5ed9182SOmar Sandoval ret = btrfs_next_item(root, path); 1447a5ed9182SOmar Sandoval if (ret < 0) 1448a5ed9182SOmar Sandoval goto out; 1449a5ed9182SOmar Sandoval if (ret) 1450a5ed9182SOmar Sandoval break; 1451a5ed9182SOmar Sandoval 1452a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 1453a5ed9182SOmar Sandoval 1454a5ed9182SOmar Sandoval if (key.type == BTRFS_FREE_SPACE_INFO_KEY) 1455a5ed9182SOmar Sandoval break; 1456a5ed9182SOmar Sandoval 1457a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_BITMAP_KEY); 1458a5ed9182SOmar Sandoval ASSERT(key.objectid < end && key.objectid + key.offset <= end); 1459a5ed9182SOmar Sandoval 1460a5ed9182SOmar Sandoval offset = key.objectid; 1461a5ed9182SOmar Sandoval while (offset < key.objectid + key.offset) { 1462a5ed9182SOmar Sandoval bit = free_space_test_bit(block_group, path, offset); 1463a5ed9182SOmar Sandoval if (prev_bit == 0 && bit == 1) { 1464a5ed9182SOmar Sandoval extent_start = offset; 1465a5ed9182SOmar Sandoval } else if (prev_bit == 1 && bit == 0) { 1466a5ed9182SOmar Sandoval total_found += add_new_free_space(block_group, 1467a5ed9182SOmar Sandoval extent_start, 1468a5ed9182SOmar Sandoval offset); 1469a5ed9182SOmar Sandoval if (total_found > CACHING_CTL_WAKE_UP) { 1470a5ed9182SOmar Sandoval total_found = 0; 1471a5ed9182SOmar Sandoval wake_up(&caching_ctl->wait); 1472a5ed9182SOmar Sandoval } 1473a5ed9182SOmar Sandoval extent_count++; 1474a5ed9182SOmar Sandoval } 1475a5ed9182SOmar Sandoval prev_bit = bit; 14760b246afaSJeff Mahoney offset += fs_info->sectorsize; 1477a5ed9182SOmar Sandoval } 1478a5ed9182SOmar Sandoval } 1479a5ed9182SOmar Sandoval if (prev_bit == 1) { 14804457c1c7SNikolay Borisov total_found += add_new_free_space(block_group, extent_start, 14814457c1c7SNikolay Borisov end); 1482a5ed9182SOmar Sandoval extent_count++; 1483a5ed9182SOmar Sandoval } 1484a5ed9182SOmar Sandoval 1485a5ed9182SOmar Sandoval if (extent_count != expected_extent_count) { 14865d163e0eSJeff Mahoney btrfs_err(fs_info, 14875d163e0eSJeff Mahoney "incorrect extent count for %llu; counted %u, expected %u", 1488b3470b5dSDavid Sterba block_group->start, extent_count, 1489a5ed9182SOmar Sandoval expected_extent_count); 1490a5ed9182SOmar Sandoval ASSERT(0); 1491a5ed9182SOmar Sandoval ret = -EIO; 1492a5ed9182SOmar Sandoval goto out; 1493a5ed9182SOmar Sandoval } 1494a5ed9182SOmar Sandoval 1495a5ed9182SOmar Sandoval ret = 0; 1496a5ed9182SOmar Sandoval out: 1497a5ed9182SOmar Sandoval return ret; 1498a5ed9182SOmar Sandoval } 1499a5ed9182SOmar Sandoval 1500a5ed9182SOmar Sandoval static int load_free_space_extents(struct btrfs_caching_control *caching_ctl, 1501a5ed9182SOmar Sandoval struct btrfs_path *path, 1502a5ed9182SOmar Sandoval u32 expected_extent_count) 1503a5ed9182SOmar Sandoval { 150432da5386SDavid Sterba struct btrfs_block_group *block_group; 1505a5ed9182SOmar Sandoval struct btrfs_fs_info *fs_info; 1506a5ed9182SOmar Sandoval struct btrfs_root *root; 1507a5ed9182SOmar Sandoval struct btrfs_key key; 1508a5ed9182SOmar Sandoval u64 end; 1509a5ed9182SOmar Sandoval u64 total_found = 0; 1510a5ed9182SOmar Sandoval u32 extent_count = 0; 1511a5ed9182SOmar Sandoval int ret; 1512a5ed9182SOmar Sandoval 1513a5ed9182SOmar Sandoval block_group = caching_ctl->block_group; 1514a5ed9182SOmar Sandoval fs_info = block_group->fs_info; 15157939dd9fSJosef Bacik root = btrfs_free_space_root(block_group); 1516a5ed9182SOmar Sandoval 1517b3470b5dSDavid Sterba end = block_group->start + block_group->length; 1518a5ed9182SOmar Sandoval 1519a5ed9182SOmar Sandoval while (1) { 1520a5ed9182SOmar Sandoval ret = btrfs_next_item(root, path); 1521a5ed9182SOmar Sandoval if (ret < 0) 1522a5ed9182SOmar Sandoval goto out; 1523a5ed9182SOmar Sandoval if (ret) 1524a5ed9182SOmar Sandoval break; 1525a5ed9182SOmar Sandoval 1526a5ed9182SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 1527a5ed9182SOmar Sandoval 1528a5ed9182SOmar Sandoval if (key.type == BTRFS_FREE_SPACE_INFO_KEY) 1529a5ed9182SOmar Sandoval break; 1530a5ed9182SOmar Sandoval 1531a5ed9182SOmar Sandoval ASSERT(key.type == BTRFS_FREE_SPACE_EXTENT_KEY); 1532a5ed9182SOmar Sandoval ASSERT(key.objectid < end && key.objectid + key.offset <= end); 1533a5ed9182SOmar Sandoval 15344457c1c7SNikolay Borisov total_found += add_new_free_space(block_group, key.objectid, 1535a5ed9182SOmar Sandoval key.objectid + key.offset); 1536a5ed9182SOmar Sandoval if (total_found > CACHING_CTL_WAKE_UP) { 1537a5ed9182SOmar Sandoval total_found = 0; 1538a5ed9182SOmar Sandoval wake_up(&caching_ctl->wait); 1539a5ed9182SOmar Sandoval } 1540a5ed9182SOmar Sandoval extent_count++; 1541a5ed9182SOmar Sandoval } 1542a5ed9182SOmar Sandoval 1543a5ed9182SOmar Sandoval if (extent_count != expected_extent_count) { 15445d163e0eSJeff Mahoney btrfs_err(fs_info, 15455d163e0eSJeff Mahoney "incorrect extent count for %llu; counted %u, expected %u", 1546b3470b5dSDavid Sterba block_group->start, extent_count, 1547a5ed9182SOmar Sandoval expected_extent_count); 1548a5ed9182SOmar Sandoval ASSERT(0); 1549a5ed9182SOmar Sandoval ret = -EIO; 1550a5ed9182SOmar Sandoval goto out; 1551a5ed9182SOmar Sandoval } 1552a5ed9182SOmar Sandoval 1553a5ed9182SOmar Sandoval ret = 0; 1554a5ed9182SOmar Sandoval out: 1555a5ed9182SOmar Sandoval return ret; 1556a5ed9182SOmar Sandoval } 1557a5ed9182SOmar Sandoval 1558a5ed9182SOmar Sandoval int load_free_space_tree(struct btrfs_caching_control *caching_ctl) 1559a5ed9182SOmar Sandoval { 156032da5386SDavid Sterba struct btrfs_block_group *block_group; 1561a5ed9182SOmar Sandoval struct btrfs_free_space_info *info; 1562a5ed9182SOmar Sandoval struct btrfs_path *path; 1563a5ed9182SOmar Sandoval u32 extent_count, flags; 1564a5ed9182SOmar Sandoval int ret; 1565a5ed9182SOmar Sandoval 1566a5ed9182SOmar Sandoval block_group = caching_ctl->block_group; 1567a5ed9182SOmar Sandoval 1568a5ed9182SOmar Sandoval path = btrfs_alloc_path(); 1569a5ed9182SOmar Sandoval if (!path) 1570a5ed9182SOmar Sandoval return -ENOMEM; 1571a5ed9182SOmar Sandoval 1572a5ed9182SOmar Sandoval /* 1573a5ed9182SOmar Sandoval * Just like caching_thread() doesn't want to deadlock on the extent 1574a5ed9182SOmar Sandoval * tree, we don't want to deadlock on the free space tree. 1575a5ed9182SOmar Sandoval */ 1576a5ed9182SOmar Sandoval path->skip_locking = 1; 1577a5ed9182SOmar Sandoval path->search_commit_root = 1; 15787ce311d5SGu JinXiang path->reada = READA_FORWARD; 1579a5ed9182SOmar Sandoval 15802ccf545eSDavid Sterba info = search_free_space_info(NULL, block_group, path, 0); 1581a5ed9182SOmar Sandoval if (IS_ERR(info)) { 1582a5ed9182SOmar Sandoval ret = PTR_ERR(info); 1583a5ed9182SOmar Sandoval goto out; 1584a5ed9182SOmar Sandoval } 1585a5ed9182SOmar Sandoval extent_count = btrfs_free_space_extent_count(path->nodes[0], info); 1586a5ed9182SOmar Sandoval flags = btrfs_free_space_flags(path->nodes[0], info); 1587a5ed9182SOmar Sandoval 1588a5ed9182SOmar Sandoval /* 1589a5ed9182SOmar Sandoval * We left path pointing to the free space info item, so now 1590a5ed9182SOmar Sandoval * load_free_space_foo can just iterate through the free space tree from 1591a5ed9182SOmar Sandoval * there. 1592a5ed9182SOmar Sandoval */ 1593a5ed9182SOmar Sandoval if (flags & BTRFS_FREE_SPACE_USING_BITMAPS) 1594a5ed9182SOmar Sandoval ret = load_free_space_bitmaps(caching_ctl, path, extent_count); 1595a5ed9182SOmar Sandoval else 1596a5ed9182SOmar Sandoval ret = load_free_space_extents(caching_ctl, path, extent_count); 1597a5ed9182SOmar Sandoval 1598a5ed9182SOmar Sandoval out: 1599a5ed9182SOmar Sandoval btrfs_free_path(path); 1600a5ed9182SOmar Sandoval return ret; 1601a5ed9182SOmar Sandoval } 1602