1 // SPDX-License-Identifier: GPL-2.0
5 #include "block-rsv.h"
6 #include "space-info.h"
8 #include "block-group.h"
14  *   reservations.  Each block_rsv has a ->size and a ->reserved.  ->size is
15  *   how large we want our block rsv to be, ->reserved is how much space is
18  *   ->failfast exists for the truncate case, and is described below.
22  *   -> Reserve
26  *     accounted for in space_info->bytes_may_use, and then add the bytes to
27  *     ->reserved, and ->size in the case of btrfs_block_rsv_add.
29  *     ->size is an over-estimation of how much we may use for a particular
32  *   -> Use
37  *     ->reserved has enough space for our tree block allocation.  Once
38  *     successful we subtract fs_info->nodesize from ->reserved.
40  *   -> Finish
44  *     from ->size, and then subtract ->size from ->reserved and free up the
49  *     space_info->bytes_may_use.
68  *   The individual item sizes are determined by the per-inode size
70  *   straightforward, it's just the calculation of ->size encodes a lot of
76  *   We assume each one of these delayed refs are going to use a full
77  *   reservation.  We use the transaction items and pre-reserve space for every
78  *   operation, and use this reservation to refill any gap between ->size and
79  *   ->reserved that may exist.
82  *   count from ->size and free up reservations as necessary.  Since this is
94  *   allocate a block reserve, set it to some size, and then truncate bytes
95  *   until we have no space left.  With ->failfast set we'll simply return
99  *   re-reserve.
107 	struct btrfs_space_info *space_info = block_rsv->space_info;  in block_rsv_release_bytes()
111 	spin_lock(&block_rsv->lock);  in block_rsv_release_bytes()
112 	if (num_bytes == (u64)-1) {  in block_rsv_release_bytes()
113 		num_bytes = block_rsv->size;  in block_rsv_release_bytes()
114 		qgroup_to_release = block_rsv->qgroup_rsv_size;  in block_rsv_release_bytes()
116 	block_rsv->size -= num_bytes;  in block_rsv_release_bytes()
117 	if (block_rsv->reserved >= block_rsv->size) {  in block_rsv_release_bytes()
118 		num_bytes = block_rsv->reserved - block_rsv->size;  in block_rsv_release_bytes()
119 		block_rsv->reserved = block_rsv->size;  in block_rsv_release_bytes()
120 		block_rsv->full = 1;  in block_rsv_release_bytes()
124 	if (block_rsv->qgroup_rsv_reserved >= block_rsv->qgroup_rsv_size) {  in block_rsv_release_bytes()
125 		qgroup_to_release = block_rsv->qgroup_rsv_reserved -  in block_rsv_release_bytes()
126 				    block_rsv->qgroup_rsv_size;  in block_rsv_release_bytes()
127 		block_rsv->qgroup_rsv_reserved = block_rsv->qgroup_rsv_size;  in block_rsv_release_bytes()
131 	spin_unlock(&block_rsv->lock);  in block_rsv_release_bytes()
136 			spin_lock(&dest->lock);  in block_rsv_release_bytes()
137 			if (!dest->full) {  in block_rsv_release_bytes()
140 				bytes_to_add = dest->size - dest->reserved;  in block_rsv_release_bytes()
142 				dest->reserved += bytes_to_add;  in block_rsv_release_bytes()
143 				if (dest->reserved >= dest->size)  in block_rsv_release_bytes()
144 					dest->full = 1;  in block_rsv_release_bytes()
145 				num_bytes -= bytes_to_add;  in block_rsv_release_bytes()
147 			spin_unlock(&dest->lock);  in block_rsv_release_bytes()
176 	spin_lock_init(&rsv->lock);  in btrfs_init_block_rsv()
177 	rsv->type = type;  in btrfs_init_block_rsv()
185 	rsv->space_info = btrfs_find_space_info(fs_info,  in btrfs_init_metadata_block_rsv()
207 	btrfs_block_rsv_release(fs_info, rsv, (u64)-1, NULL);  in btrfs_free_block_rsv()
230 	int ret = -ENOSPC;  in btrfs_block_rsv_check()
235 	spin_lock(&block_rsv->lock);  in btrfs_block_rsv_check()
236 	num_bytes = div_factor(block_rsv->size, min_factor);  in btrfs_block_rsv_check()
237 	if (block_rsv->reserved >= num_bytes)  in btrfs_block_rsv_check()
239 	spin_unlock(&block_rsv->lock);  in btrfs_block_rsv_check()
249 	int ret = -ENOSPC;  in btrfs_block_rsv_refill()
254 	spin_lock(&block_rsv->lock);  in btrfs_block_rsv_refill()
256 	if (block_rsv->reserved >= num_bytes)  in btrfs_block_rsv_refill()
259 		num_bytes -= block_rsv->reserved;  in btrfs_block_rsv_refill()
260 	spin_unlock(&block_rsv->lock);  in btrfs_block_rsv_refill()
278 	struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv;  in btrfs_block_rsv_release()
279 	struct btrfs_block_rsv *delayed_rsv = &fs_info->delayed_refs_rsv;  in btrfs_block_rsv_release()
284 	 * into the delayed rsv if it is not full.  in btrfs_block_rsv_release()
288 	else if (block_rsv != global_rsv && !delayed_rsv->full)  in btrfs_block_rsv_release()
291 	if (target && block_rsv->space_info != target->space_info)  in btrfs_block_rsv_release()
300 	int ret = -ENOSPC;  in btrfs_block_rsv_use_bytes()
302 	spin_lock(&block_rsv->lock);  in btrfs_block_rsv_use_bytes()
303 	if (block_rsv->reserved >= num_bytes) {  in btrfs_block_rsv_use_bytes()
304 		block_rsv->reserved -= num_bytes;  in btrfs_block_rsv_use_bytes()
305 		if (block_rsv->reserved < block_rsv->size)  in btrfs_block_rsv_use_bytes()
306 			block_rsv->full = 0;  in btrfs_block_rsv_use_bytes()
309 	spin_unlock(&block_rsv->lock);  in btrfs_block_rsv_use_bytes()
316 	spin_lock(&block_rsv->lock);  in btrfs_block_rsv_add_bytes()
317 	block_rsv->reserved += num_bytes;  in btrfs_block_rsv_add_bytes()
319 		block_rsv->size += num_bytes;  in btrfs_block_rsv_add_bytes()
320 	else if (block_rsv->reserved >= block_rsv->size)  in btrfs_block_rsv_add_bytes()
321 		block_rsv->full = 1;  in btrfs_block_rsv_add_bytes()
322 	spin_unlock(&block_rsv->lock);  in btrfs_block_rsv_add_bytes()
329 	struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv;  in btrfs_cond_migrate_bytes()
332 	if (global_rsv->space_info != dest->space_info)  in btrfs_cond_migrate_bytes()
333 		return -ENOSPC;  in btrfs_cond_migrate_bytes()
335 	spin_lock(&global_rsv->lock);  in btrfs_cond_migrate_bytes()
336 	min_bytes = div_factor(global_rsv->size, min_factor);  in btrfs_cond_migrate_bytes()
337 	if (global_rsv->reserved < min_bytes + num_bytes) {  in btrfs_cond_migrate_bytes()
338 		spin_unlock(&global_rsv->lock);  in btrfs_cond_migrate_bytes()
339 		return -ENOSPC;  in btrfs_cond_migrate_bytes()
341 	global_rsv->reserved -= num_bytes;  in btrfs_cond_migrate_bytes()
342 	if (global_rsv->reserved < global_rsv->size)  in btrfs_cond_migrate_bytes()
343 		global_rsv->full = 0;  in btrfs_cond_migrate_bytes()
344 	spin_unlock(&global_rsv->lock);  in btrfs_cond_migrate_bytes()
352 	struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;  in btrfs_update_global_block_rsv()
353 	struct btrfs_space_info *sinfo = block_rsv->space_info;  in btrfs_update_global_block_rsv()
358 	 * The global block rsv is based on the size of the extent tree, the  in btrfs_update_global_block_rsv()
362 	num_bytes = btrfs_root_used(&fs_info->extent_root->root_item) +  in btrfs_update_global_block_rsv()
363 		btrfs_root_used(&fs_info->csum_root->root_item) +  in btrfs_update_global_block_rsv()
364 		btrfs_root_used(&fs_info->tree_root->root_item);  in btrfs_update_global_block_rsv()
386 	spin_lock(&sinfo->lock);  in btrfs_update_global_block_rsv()
387 	spin_lock(&block_rsv->lock);  in btrfs_update_global_block_rsv()
389 	block_rsv->size = min_t(u64, num_bytes, SZ_512M);  in btrfs_update_global_block_rsv()
391 	if (block_rsv->reserved < block_rsv->size) {  in btrfs_update_global_block_rsv()
392 		num_bytes = block_rsv->size - block_rsv->reserved;  in btrfs_update_global_block_rsv()
395 		block_rsv->reserved = block_rsv->size;  in btrfs_update_global_block_rsv()
396 	} else if (block_rsv->reserved > block_rsv->size) {  in btrfs_update_global_block_rsv()
397 		num_bytes = block_rsv->reserved - block_rsv->size;  in btrfs_update_global_block_rsv()
399 						      -num_bytes);  in btrfs_update_global_block_rsv()
400 		block_rsv->reserved = block_rsv->size;  in btrfs_update_global_block_rsv()
404 	if (block_rsv->reserved == block_rsv->size)  in btrfs_update_global_block_rsv()
405 		block_rsv->full = 1;  in btrfs_update_global_block_rsv()
407 		block_rsv->full = 0;  in btrfs_update_global_block_rsv()
409 	if (block_rsv->size >= sinfo->total_bytes)  in btrfs_update_global_block_rsv()
410 		sinfo->force_alloc = CHUNK_ALLOC_FORCE;  in btrfs_update_global_block_rsv()
411 	spin_unlock(&block_rsv->lock);  in btrfs_update_global_block_rsv()
412 	spin_unlock(&sinfo->lock);  in btrfs_update_global_block_rsv()
420 	fs_info->chunk_block_rsv.space_info = space_info;  in btrfs_init_global_block_rsv()
423 	fs_info->global_block_rsv.space_info = space_info;  in btrfs_init_global_block_rsv()
424 	fs_info->trans_block_rsv.space_info = space_info;  in btrfs_init_global_block_rsv()
425 	fs_info->empty_block_rsv.space_info = space_info;  in btrfs_init_global_block_rsv()
426 	fs_info->delayed_block_rsv.space_info = space_info;  in btrfs_init_global_block_rsv()
427 	fs_info->delayed_refs_rsv.space_info = space_info;  in btrfs_init_global_block_rsv()
433 	if (!fs_info->extent_root || !fs_info->csum_root ||  in btrfs_init_global_block_rsv()
434 	    !fs_info->dev_root || !fs_info->chunk_root || !fs_info->tree_root)  in btrfs_init_global_block_rsv()
437 	fs_info->extent_root->block_rsv = &fs_info->delayed_refs_rsv;  in btrfs_init_global_block_rsv()
438 	fs_info->csum_root->block_rsv = &fs_info->delayed_refs_rsv;  in btrfs_init_global_block_rsv()
439 	fs_info->dev_root->block_rsv = &fs_info->global_block_rsv;  in btrfs_init_global_block_rsv()
440 	fs_info->tree_root->block_rsv = &fs_info->global_block_rsv;  in btrfs_init_global_block_rsv()
441 	if (fs_info->quota_root)  in btrfs_init_global_block_rsv()
442 		fs_info->quota_root->block_rsv = &fs_info->global_block_rsv;  in btrfs_init_global_block_rsv()
443 	fs_info->chunk_root->block_rsv = &fs_info->chunk_block_rsv;  in btrfs_init_global_block_rsv()
450 	btrfs_block_rsv_release(fs_info, &fs_info->global_block_rsv, (u64)-1,  in btrfs_release_global_block_rsv()
452 	WARN_ON(fs_info->trans_block_rsv.size > 0);  in btrfs_release_global_block_rsv()
453 	WARN_ON(fs_info->trans_block_rsv.reserved > 0);  in btrfs_release_global_block_rsv()
454 	WARN_ON(fs_info->chunk_block_rsv.size > 0);  in btrfs_release_global_block_rsv()
455 	WARN_ON(fs_info->chunk_block_rsv.reserved > 0);  in btrfs_release_global_block_rsv()
456 	WARN_ON(fs_info->delayed_block_rsv.size > 0);  in btrfs_release_global_block_rsv()
457 	WARN_ON(fs_info->delayed_block_rsv.reserved > 0);  in btrfs_release_global_block_rsv()
458 	WARN_ON(fs_info->delayed_refs_rsv.reserved > 0);  in btrfs_release_global_block_rsv()
459 	WARN_ON(fs_info->delayed_refs_rsv.size > 0);  in btrfs_release_global_block_rsv()
466 	struct btrfs_fs_info *fs_info = root->fs_info;  in get_block_rsv()
469 	if (test_bit(BTRFS_ROOT_SHAREABLE, &root->state) ||  in get_block_rsv()
470 	    (root == fs_info->csum_root && trans->adding_csums) ||  in get_block_rsv()
471 	    (root == fs_info->uuid_root))  in get_block_rsv()
472 		block_rsv = trans->block_rsv;  in get_block_rsv()
475 		block_rsv = root->block_rsv;  in get_block_rsv()
478 		block_rsv = &fs_info->empty_block_rsv;  in get_block_rsv()
487 	struct btrfs_fs_info *fs_info = root->fs_info;  in btrfs_use_block_rsv()
489 	struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv;  in btrfs_use_block_rsv()
495 	if (unlikely(block_rsv->size == 0))  in btrfs_use_block_rsv()
502 	if (block_rsv->failfast)  in btrfs_use_block_rsv()
505 	if (block_rsv->type == BTRFS_BLOCK_RSV_GLOBAL && !global_updated) {  in btrfs_use_block_rsv()
515 	if (block_rsv->type != BTRFS_BLOCK_RSV_DELREFS &&  in btrfs_use_block_rsv()
523 				block_rsv->type, ret);  in btrfs_use_block_rsv()
535 	if (block_rsv->type != BTRFS_BLOCK_RSV_GLOBAL &&  in btrfs_use_block_rsv()
536 	    block_rsv->space_info == global_rsv->space_info) {  in btrfs_use_block_rsv()