1 // SPDX-License-Identifier: GPL-2.0
6 #include "space-info.h"
7 #include "transaction.h"
9 static u64 block_rsv_release_bytes(struct btrfs_fs_info *fs_info,
10 struct btrfs_block_rsv *block_rsv,
11 struct btrfs_block_rsv *dest, u64 num_bytes,
12 u64 *qgroup_to_release_ret)
14 struct btrfs_space_info *space_info = block_rsv->space_info;
15 u64 qgroup_to_release = 0;
18 spin_lock(&block_rsv->lock);
19 if (num_bytes == (u64)-1) {
20 num_bytes = block_rsv->size;
21 qgroup_to_release = block_rsv->qgroup_rsv_size;
23 block_rsv->size -= num_bytes;
24 if (block_rsv->reserved >= block_rsv->size) {
25 num_bytes = block_rsv->reserved - block_rsv->size;
26 block_rsv->reserved = block_rsv->size;
31 if (block_rsv->qgroup_rsv_reserved >= block_rsv->qgroup_rsv_size) {
32 qgroup_to_release = block_rsv->qgroup_rsv_reserved -
33 block_rsv->qgroup_rsv_size;
34 block_rsv->qgroup_rsv_reserved = block_rsv->qgroup_rsv_size;
36 qgroup_to_release = 0;
38 spin_unlock(&block_rsv->lock);
43 spin_lock(&dest->lock);
47 bytes_to_add = dest->size - dest->reserved;
48 bytes_to_add = min(num_bytes, bytes_to_add);
49 dest->reserved += bytes_to_add;
50 if (dest->reserved >= dest->size)
52 num_bytes -= bytes_to_add;
54 spin_unlock(&dest->lock);
57 btrfs_space_info_free_bytes_may_use(fs_info,
61 if (qgroup_to_release_ret)
62 *qgroup_to_release_ret = qgroup_to_release;
66 int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src,
67 struct btrfs_block_rsv *dst, u64 num_bytes,
72 ret = btrfs_block_rsv_use_bytes(src, num_bytes);
76 btrfs_block_rsv_add_bytes(dst, num_bytes, update_size);
80 void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type)
82 memset(rsv, 0, sizeof(*rsv));
83 spin_lock_init(&rsv->lock);
87 void btrfs_init_metadata_block_rsv(struct btrfs_fs_info *fs_info,
88 struct btrfs_block_rsv *rsv,
91 btrfs_init_block_rsv(rsv, type);
92 rsv->space_info = btrfs_find_space_info(fs_info,
93 BTRFS_BLOCK_GROUP_METADATA);
96 struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_fs_info *fs_info,
99 struct btrfs_block_rsv *block_rsv;
101 block_rsv = kmalloc(sizeof(*block_rsv), GFP_NOFS);
105 btrfs_init_metadata_block_rsv(fs_info, block_rsv, type);
109 void btrfs_free_block_rsv(struct btrfs_fs_info *fs_info,
110 struct btrfs_block_rsv *rsv)
114 btrfs_block_rsv_release(fs_info, rsv, (u64)-1);
118 int btrfs_block_rsv_add(struct btrfs_root *root,
119 struct btrfs_block_rsv *block_rsv, u64 num_bytes,
120 enum btrfs_reserve_flush_enum flush)
127 ret = btrfs_reserve_metadata_bytes(root, block_rsv, num_bytes, flush);
129 btrfs_block_rsv_add_bytes(block_rsv, num_bytes, true);
134 int btrfs_block_rsv_check(struct btrfs_block_rsv *block_rsv, int min_factor)
142 spin_lock(&block_rsv->lock);
143 num_bytes = div_factor(block_rsv->size, min_factor);
144 if (block_rsv->reserved >= num_bytes)
146 spin_unlock(&block_rsv->lock);
151 int btrfs_block_rsv_refill(struct btrfs_root *root,
152 struct btrfs_block_rsv *block_rsv, u64 min_reserved,
153 enum btrfs_reserve_flush_enum flush)
161 spin_lock(&block_rsv->lock);
162 num_bytes = min_reserved;
163 if (block_rsv->reserved >= num_bytes)
166 num_bytes -= block_rsv->reserved;
167 spin_unlock(&block_rsv->lock);
172 ret = btrfs_reserve_metadata_bytes(root, block_rsv, num_bytes, flush);
174 btrfs_block_rsv_add_bytes(block_rsv, num_bytes, false);
181 u64 __btrfs_block_rsv_release(struct btrfs_fs_info *fs_info,
182 struct btrfs_block_rsv *block_rsv,
183 u64 num_bytes, u64 *qgroup_to_release)
185 struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv;
186 struct btrfs_block_rsv *delayed_rsv = &fs_info->delayed_refs_rsv;
187 struct btrfs_block_rsv *target = NULL;
190 * If we are the delayed_rsv then push to the global rsv, otherwise dump
191 * into the delayed rsv if it is not full.
193 if (block_rsv == delayed_rsv)
195 else if (block_rsv != global_rsv && !delayed_rsv->full)
196 target = delayed_rsv;
198 if (target && block_rsv->space_info != target->space_info)
201 return block_rsv_release_bytes(fs_info, block_rsv, target, num_bytes,
205 int btrfs_block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, u64 num_bytes)
209 spin_lock(&block_rsv->lock);
210 if (block_rsv->reserved >= num_bytes) {
211 block_rsv->reserved -= num_bytes;
212 if (block_rsv->reserved < block_rsv->size)
216 spin_unlock(&block_rsv->lock);
220 void btrfs_block_rsv_add_bytes(struct btrfs_block_rsv *block_rsv,
221 u64 num_bytes, bool update_size)
223 spin_lock(&block_rsv->lock);
224 block_rsv->reserved += num_bytes;
226 block_rsv->size += num_bytes;
227 else if (block_rsv->reserved >= block_rsv->size)
229 spin_unlock(&block_rsv->lock);
232 int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info,
233 struct btrfs_block_rsv *dest, u64 num_bytes,
236 struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv;
239 if (global_rsv->space_info != dest->space_info)
242 spin_lock(&global_rsv->lock);
243 min_bytes = div_factor(global_rsv->size, min_factor);
244 if (global_rsv->reserved < min_bytes + num_bytes) {
245 spin_unlock(&global_rsv->lock);
248 global_rsv->reserved -= num_bytes;
249 if (global_rsv->reserved < global_rsv->size)
250 global_rsv->full = 0;
251 spin_unlock(&global_rsv->lock);
253 btrfs_block_rsv_add_bytes(dest, num_bytes, true);
257 void btrfs_update_global_block_rsv(struct btrfs_fs_info *fs_info)
259 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
260 struct btrfs_space_info *sinfo = block_rsv->space_info;
265 * The global block rsv is based on the size of the extent tree, the
266 * checksum tree and the root tree. If the fs is empty we want to set
267 * it to a minimal amount for safety.
269 num_bytes = btrfs_root_used(&fs_info->extent_root->root_item) +
270 btrfs_root_used(&fs_info->csum_root->root_item) +
271 btrfs_root_used(&fs_info->tree_root->root_item);
274 * We at a minimum are going to modify the csum root, the tree root, and
280 * But we also want to reserve enough space so we can do the fallback
281 * global reserve for an unlink, which is an additional 5 items (see the
282 * comment in __unlink_start_trans for what we're modifying.)
284 * But we also need space for the delayed ref updates from the unlink,
285 * so its 10, 5 for the actual operation, and 5 for the delayed ref
290 num_bytes = max_t(u64, num_bytes,
291 btrfs_calc_insert_metadata_size(fs_info, min_items));
293 spin_lock(&sinfo->lock);
294 spin_lock(&block_rsv->lock);
296 block_rsv->size = min_t(u64, num_bytes, SZ_512M);
298 if (block_rsv->reserved < block_rsv->size) {
299 num_bytes = block_rsv->size - block_rsv->reserved;
300 block_rsv->reserved += num_bytes;
301 btrfs_space_info_update_bytes_may_use(fs_info, sinfo,
303 } else if (block_rsv->reserved > block_rsv->size) {
304 num_bytes = block_rsv->reserved - block_rsv->size;
305 btrfs_space_info_update_bytes_may_use(fs_info, sinfo,
307 block_rsv->reserved = block_rsv->size;
308 btrfs_try_granting_tickets(fs_info, sinfo);
311 if (block_rsv->reserved == block_rsv->size)
316 spin_unlock(&block_rsv->lock);
317 spin_unlock(&sinfo->lock);
320 void btrfs_init_global_block_rsv(struct btrfs_fs_info *fs_info)
322 struct btrfs_space_info *space_info;
324 space_info = btrfs_find_space_info(fs_info, BTRFS_BLOCK_GROUP_SYSTEM);
325 fs_info->chunk_block_rsv.space_info = space_info;
327 space_info = btrfs_find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA);
328 fs_info->global_block_rsv.space_info = space_info;
329 fs_info->trans_block_rsv.space_info = space_info;
330 fs_info->empty_block_rsv.space_info = space_info;
331 fs_info->delayed_block_rsv.space_info = space_info;
332 fs_info->delayed_refs_rsv.space_info = space_info;
334 fs_info->extent_root->block_rsv = &fs_info->delayed_refs_rsv;
335 fs_info->csum_root->block_rsv = &fs_info->delayed_refs_rsv;
336 fs_info->dev_root->block_rsv = &fs_info->global_block_rsv;
337 fs_info->tree_root->block_rsv = &fs_info->global_block_rsv;
338 if (fs_info->quota_root)
339 fs_info->quota_root->block_rsv = &fs_info->global_block_rsv;
340 fs_info->chunk_root->block_rsv = &fs_info->chunk_block_rsv;
342 btrfs_update_global_block_rsv(fs_info);
345 void btrfs_release_global_block_rsv(struct btrfs_fs_info *fs_info)
347 btrfs_block_rsv_release(fs_info, &fs_info->global_block_rsv, (u64)-1);
348 WARN_ON(fs_info->trans_block_rsv.size > 0);
349 WARN_ON(fs_info->trans_block_rsv.reserved > 0);
350 WARN_ON(fs_info->chunk_block_rsv.size > 0);
351 WARN_ON(fs_info->chunk_block_rsv.reserved > 0);
352 WARN_ON(fs_info->delayed_block_rsv.size > 0);
353 WARN_ON(fs_info->delayed_block_rsv.reserved > 0);
354 WARN_ON(fs_info->delayed_refs_rsv.reserved > 0);
355 WARN_ON(fs_info->delayed_refs_rsv.size > 0);
358 static struct btrfs_block_rsv *get_block_rsv(
359 const struct btrfs_trans_handle *trans,
360 const struct btrfs_root *root)
362 struct btrfs_fs_info *fs_info = root->fs_info;
363 struct btrfs_block_rsv *block_rsv = NULL;
365 if (test_bit(BTRFS_ROOT_REF_COWS, &root->state) ||
366 (root == fs_info->csum_root && trans->adding_csums) ||
367 (root == fs_info->uuid_root))
368 block_rsv = trans->block_rsv;
371 block_rsv = root->block_rsv;
374 block_rsv = &fs_info->empty_block_rsv;
379 struct btrfs_block_rsv *btrfs_use_block_rsv(struct btrfs_trans_handle *trans,
380 struct btrfs_root *root,
383 struct btrfs_fs_info *fs_info = root->fs_info;
384 struct btrfs_block_rsv *block_rsv;
385 struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv;
387 bool global_updated = false;
389 block_rsv = get_block_rsv(trans, root);
391 if (unlikely(block_rsv->size == 0))
394 ret = btrfs_block_rsv_use_bytes(block_rsv, blocksize);
398 if (block_rsv->failfast)
401 if (block_rsv->type == BTRFS_BLOCK_RSV_GLOBAL && !global_updated) {
402 global_updated = true;
403 btrfs_update_global_block_rsv(fs_info);
408 * The global reserve still exists to save us from ourselves, so don't
409 * warn_on if we are short on our delayed refs reserve.
411 if (block_rsv->type != BTRFS_BLOCK_RSV_DELREFS &&
412 btrfs_test_opt(fs_info, ENOSPC_DEBUG)) {
413 static DEFINE_RATELIMIT_STATE(_rs,
414 DEFAULT_RATELIMIT_INTERVAL * 10,
415 /*DEFAULT_RATELIMIT_BURST*/ 1);
416 if (__ratelimit(&_rs))
418 "BTRFS: block rsv returned %d\n", ret);
421 ret = btrfs_reserve_metadata_bytes(root, block_rsv, blocksize,
422 BTRFS_RESERVE_NO_FLUSH);
426 * If we couldn't reserve metadata bytes try and use some from
427 * the global reserve if its space type is the same as the global
430 if (block_rsv->type != BTRFS_BLOCK_RSV_GLOBAL &&
431 block_rsv->space_info == global_rsv->space_info) {
432 ret = btrfs_block_rsv_use_bytes(global_rsv, blocksize);