1 // SPDX-License-Identifier: GPL-2.0
5 #include "block-rsv.h"
6 #include "space-info.h"
8 #include "block-group.h"
16  *   reservations.  Each block_rsv has a ->size and a ->reserved.  ->size is
17  *   how large we want our block rsv to be, ->reserved is how much space is
20  *   ->failfast exists for the truncate case, and is described below.
24  *   -> Reserve
28  *     accounted for in space_info->bytes_may_use, and then add the bytes to
29  *     ->reserved, and ->size in the case of btrfs_block_rsv_add.
31  *     ->size is an over-estimation of how much we may use for a particular
34  *   -> Use
39  *     ->reserved has enough space for our tree block allocation.  Once
40  *     successful we subtract fs_info->nodesize from ->reserved.
42  *   -> Finish
46  *     from ->size, and then subtract ->size from ->reserved and free up the
51  *     space_info->bytes_may_use.
70  *   The individual item sizes are determined by the per-inode size
72  *   straightforward, it's just the calculation of ->size encodes a lot of
78  *   We assume each one of these delayed refs are going to use a full
79  *   reservation.  We use the transaction items and pre-reserve space for every
80  *   operation, and use this reservation to refill any gap between ->size and
81  *   ->reserved that may exist.
84  *   count from ->size and free up reservations as necessary.  Since this is
96  *   allocate a block reserve, set it to some size, and then truncate bytes
97  *   until we have no space left.  With ->failfast set we'll simply return
101  *   re-reserve.
109 	struct btrfs_space_info *space_info = block_rsv->space_info;  in block_rsv_release_bytes()
113 	spin_lock(&block_rsv->lock);  in block_rsv_release_bytes()
114 	if (num_bytes == (u64)-1) {  in block_rsv_release_bytes()
115 		num_bytes = block_rsv->size;  in block_rsv_release_bytes()
116 		qgroup_to_release = block_rsv->qgroup_rsv_size;  in block_rsv_release_bytes()
118 	block_rsv->size -= num_bytes;  in block_rsv_release_bytes()
119 	if (block_rsv->reserved >= block_rsv->size) {  in block_rsv_release_bytes()
120 		num_bytes = block_rsv->reserved - block_rsv->size;  in block_rsv_release_bytes()
121 		block_rsv->reserved = block_rsv->size;  in block_rsv_release_bytes()
122 		block_rsv->full = true;  in block_rsv_release_bytes()
127 	    block_rsv->qgroup_rsv_reserved >= block_rsv->qgroup_rsv_size) {  in block_rsv_release_bytes()
128 		qgroup_to_release = block_rsv->qgroup_rsv_reserved -  in block_rsv_release_bytes()
129 				    block_rsv->qgroup_rsv_size;  in block_rsv_release_bytes()
130 		block_rsv->qgroup_rsv_reserved = block_rsv->qgroup_rsv_size;  in block_rsv_release_bytes()
134 	spin_unlock(&block_rsv->lock);  in block_rsv_release_bytes()
139 			spin_lock(&dest->lock);  in block_rsv_release_bytes()
140 			if (!dest->full) {  in block_rsv_release_bytes()
143 				bytes_to_add = dest->size - dest->reserved;  in block_rsv_release_bytes()
145 				dest->reserved += bytes_to_add;  in block_rsv_release_bytes()
146 				if (dest->reserved >= dest->size)  in block_rsv_release_bytes()
147 					dest->full = true;  in block_rsv_release_bytes()
148 				num_bytes -= bytes_to_add;  in block_rsv_release_bytes()
150 			spin_unlock(&dest->lock);  in block_rsv_release_bytes()
177 	spin_lock_init(&rsv->lock);  in btrfs_init_block_rsv()
178 	rsv->type = type;  in btrfs_init_block_rsv()
186 	rsv->space_info = btrfs_find_space_info(fs_info,  in btrfs_init_metadata_block_rsv()
208 	btrfs_block_rsv_release(fs_info, rsv, (u64)-1, NULL);  in btrfs_free_block_rsv()
221 	ret = btrfs_reserve_metadata_bytes(fs_info, block_rsv->space_info,  in btrfs_block_rsv_add()
232 	int ret = -ENOSPC;  in btrfs_block_rsv_check()
234 	spin_lock(&block_rsv->lock);  in btrfs_block_rsv_check()
235 	num_bytes = mult_perc(block_rsv->size, min_percent);  in btrfs_block_rsv_check()
236 	if (block_rsv->reserved >= num_bytes)  in btrfs_block_rsv_check()
238 	spin_unlock(&block_rsv->lock);  in btrfs_block_rsv_check()
247 	int ret = -ENOSPC;  in btrfs_block_rsv_refill()
252 	spin_lock(&block_rsv->lock);  in btrfs_block_rsv_refill()
253 	if (block_rsv->reserved >= num_bytes)  in btrfs_block_rsv_refill()
256 		num_bytes -= block_rsv->reserved;  in btrfs_block_rsv_refill()
257 	spin_unlock(&block_rsv->lock);  in btrfs_block_rsv_refill()
262 	ret = btrfs_reserve_metadata_bytes(fs_info, block_rsv->space_info,  in btrfs_block_rsv_refill()
276 	struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv;  in btrfs_block_rsv_release()
277 	struct btrfs_block_rsv *delayed_rsv = &fs_info->delayed_refs_rsv;  in btrfs_block_rsv_release()
282 	 * otherwise dump into the global delayed reserve if it is not full.  in btrfs_block_rsv_release()
284 	if (block_rsv->type == BTRFS_BLOCK_RSV_DELOPS)  in btrfs_block_rsv_release()
289 	if (target && block_rsv->space_info != target->space_info)  in btrfs_block_rsv_release()
298 	int ret = -ENOSPC;  in btrfs_block_rsv_use_bytes()
300 	spin_lock(&block_rsv->lock);  in btrfs_block_rsv_use_bytes()
301 	if (block_rsv->reserved >= num_bytes) {  in btrfs_block_rsv_use_bytes()
302 		block_rsv->reserved -= num_bytes;  in btrfs_block_rsv_use_bytes()
303 		if (block_rsv->reserved < block_rsv->size)  in btrfs_block_rsv_use_bytes()
304 			block_rsv->full = false;  in btrfs_block_rsv_use_bytes()
307 	spin_unlock(&block_rsv->lock);  in btrfs_block_rsv_use_bytes()
314 	spin_lock(&block_rsv->lock);  in btrfs_block_rsv_add_bytes()
315 	block_rsv->reserved += num_bytes;  in btrfs_block_rsv_add_bytes()
317 		block_rsv->size += num_bytes;  in btrfs_block_rsv_add_bytes()
318 	else if (block_rsv->reserved >= block_rsv->size)  in btrfs_block_rsv_add_bytes()
319 		block_rsv->full = true;  in btrfs_block_rsv_add_bytes()
320 	spin_unlock(&block_rsv->lock);  in btrfs_block_rsv_add_bytes()
325 	struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;  in btrfs_update_global_block_rsv()
326 	struct btrfs_space_info *sinfo = block_rsv->space_info;  in btrfs_update_global_block_rsv()
328 	u64 num_bytes = btrfs_root_used(&fs_info->tree_root->root_item);  in btrfs_update_global_block_rsv()
332 	 * The global block rsv is based on the size of the extent tree, the  in btrfs_update_global_block_rsv()
339 	read_lock(&fs_info->global_root_lock);  in btrfs_update_global_block_rsv()
340 	rbtree_postorder_for_each_entry_safe(root, tmp, &fs_info->global_root_tree,  in btrfs_update_global_block_rsv()
345 			num_bytes += btrfs_root_used(&root->root_item);  in btrfs_update_global_block_rsv()
349 	read_unlock(&fs_info->global_root_lock);  in btrfs_update_global_block_rsv()
352 		num_bytes += btrfs_root_used(&fs_info->block_group_root->root_item);  in btrfs_update_global_block_rsv()
357 		num_bytes += btrfs_root_used(&fs_info->stripe_root->root_item);  in btrfs_update_global_block_rsv()
377 	spin_lock(&sinfo->lock);  in btrfs_update_global_block_rsv()
378 	spin_lock(&block_rsv->lock);  in btrfs_update_global_block_rsv()
380 	block_rsv->size = min_t(u64, num_bytes, SZ_512M);  in btrfs_update_global_block_rsv()
382 	if (block_rsv->reserved < block_rsv->size) {  in btrfs_update_global_block_rsv()
383 		num_bytes = block_rsv->size - block_rsv->reserved;  in btrfs_update_global_block_rsv()
385 		block_rsv->reserved = block_rsv->size;  in btrfs_update_global_block_rsv()
386 	} else if (block_rsv->reserved > block_rsv->size) {  in btrfs_update_global_block_rsv()
387 		num_bytes = block_rsv->reserved - block_rsv->size;  in btrfs_update_global_block_rsv()
388 		btrfs_space_info_update_bytes_may_use(sinfo, -num_bytes);  in btrfs_update_global_block_rsv()
389 		block_rsv->reserved = block_rsv->size;  in btrfs_update_global_block_rsv()
393 	block_rsv->full = (block_rsv->reserved == block_rsv->size);  in btrfs_update_global_block_rsv()
395 	if (block_rsv->size >= sinfo->total_bytes)  in btrfs_update_global_block_rsv()
396 		sinfo->force_alloc = CHUNK_ALLOC_FORCE;  in btrfs_update_global_block_rsv()
397 	spin_unlock(&block_rsv->lock);  in btrfs_update_global_block_rsv()
398 	spin_unlock(&sinfo->lock);  in btrfs_update_global_block_rsv()
403 	struct btrfs_fs_info *fs_info = root->fs_info;  in btrfs_init_root_block_rsv()
411 		root->block_rsv = &fs_info->delayed_refs_rsv;  in btrfs_init_root_block_rsv()
416 		root->block_rsv = &fs_info->global_block_rsv;  in btrfs_init_root_block_rsv()
419 		root->block_rsv = &fs_info->chunk_block_rsv;  in btrfs_init_root_block_rsv()
422 		root->block_rsv = NULL;  in btrfs_init_root_block_rsv()
432 	fs_info->chunk_block_rsv.space_info = space_info;  in btrfs_init_global_block_rsv()
435 	fs_info->global_block_rsv.space_info = space_info;  in btrfs_init_global_block_rsv()
436 	fs_info->trans_block_rsv.space_info = space_info;  in btrfs_init_global_block_rsv()
437 	fs_info->empty_block_rsv.space_info = space_info;  in btrfs_init_global_block_rsv()
438 	fs_info->delayed_block_rsv.space_info = space_info;  in btrfs_init_global_block_rsv()
439 	fs_info->delayed_refs_rsv.space_info = space_info;  in btrfs_init_global_block_rsv()
446 	btrfs_block_rsv_release(fs_info, &fs_info->global_block_rsv, (u64)-1,  in btrfs_release_global_block_rsv()
448 	WARN_ON(fs_info->trans_block_rsv.size > 0);  in btrfs_release_global_block_rsv()
449 	WARN_ON(fs_info->trans_block_rsv.reserved > 0);  in btrfs_release_global_block_rsv()
450 	WARN_ON(fs_info->chunk_block_rsv.size > 0);  in btrfs_release_global_block_rsv()
451 	WARN_ON(fs_info->chunk_block_rsv.reserved > 0);  in btrfs_release_global_block_rsv()
452 	WARN_ON(fs_info->delayed_block_rsv.size > 0);  in btrfs_release_global_block_rsv()
453 	WARN_ON(fs_info->delayed_block_rsv.reserved > 0);  in btrfs_release_global_block_rsv()
454 	WARN_ON(fs_info->delayed_refs_rsv.reserved > 0);  in btrfs_release_global_block_rsv()
455 	WARN_ON(fs_info->delayed_refs_rsv.size > 0);  in btrfs_release_global_block_rsv()
462 	struct btrfs_fs_info *fs_info = root->fs_info;  in get_block_rsv()
465 	if (test_bit(BTRFS_ROOT_SHAREABLE, &root->state) ||  in get_block_rsv()
466 	    (root == fs_info->uuid_root) ||  in get_block_rsv()
467 	    (trans->adding_csums && btrfs_root_id(root) == BTRFS_CSUM_TREE_OBJECTID))  in get_block_rsv()
468 		block_rsv = trans->block_rsv;  in get_block_rsv()
471 		block_rsv = root->block_rsv;  in get_block_rsv()
474 		block_rsv = &fs_info->empty_block_rsv;  in get_block_rsv()
483 	struct btrfs_fs_info *fs_info = root->fs_info;  in btrfs_use_block_rsv()
485 	struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv;  in btrfs_use_block_rsv()
498 	if (block_rsv->failfast)  in btrfs_use_block_rsv()
501 	if (block_rsv->type == BTRFS_BLOCK_RSV_GLOBAL && !global_updated) {  in btrfs_use_block_rsv()
511 	if (block_rsv->type != BTRFS_BLOCK_RSV_DELREFS &&  in btrfs_use_block_rsv()
519 				block_rsv->type, ret);  in btrfs_use_block_rsv()
522 	ret = btrfs_reserve_metadata_bytes(fs_info, block_rsv->space_info,  in btrfs_use_block_rsv()
531 	if (block_rsv->type != BTRFS_BLOCK_RSV_GLOBAL &&  in btrfs_use_block_rsv()
532 	    block_rsv->space_info == global_rsv->space_info) {  in btrfs_use_block_rsv()
544 	ret = btrfs_reserve_metadata_bytes(fs_info, block_rsv->space_info, blocksize,  in btrfs_use_block_rsv()
562 	spin_lock(&rsv->lock);  in btrfs_check_trunc_cache_free_space()
563 	if (rsv->reserved < needed_bytes)  in btrfs_check_trunc_cache_free_space()
564 		ret = -ENOSPC;  in btrfs_check_trunc_cache_free_space()
567 	spin_unlock(&rsv->lock);  in btrfs_check_trunc_cache_free_space()