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
16  *   currently reserved for this block reserve.
27  *     ->reserved, and ->size in the case of btrfs_block_rsv_add.
37  *     ->reserved has enough space for our tree block allocation.  Once
38  *     successful we subtract fs_info->nodesize from ->reserved.
44  *     from ->size, and then subtract ->size from ->reserved and free up the
79  *   ->reserved that may exist.
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()
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()
237 	if (block_rsv->reserved >= num_bytes)  in btrfs_block_rsv_check()
256 	if (block_rsv->reserved >= num_bytes)  in btrfs_block_rsv_refill()
259 		num_bytes -= block_rsv->reserved;  in btrfs_block_rsv_refill()
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()
317 	block_rsv->reserved += num_bytes;  in btrfs_block_rsv_add_bytes()
320 	else if (block_rsv->reserved >= block_rsv->size)  in btrfs_block_rsv_add_bytes()
337 	if (global_rsv->reserved < min_bytes + num_bytes) {  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()
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()
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()
445 	WARN_ON(fs_info->trans_block_rsv.reserved > 0);  in btrfs_release_global_block_rsv()
447 	WARN_ON(fs_info->chunk_block_rsv.reserved > 0);  in btrfs_release_global_block_rsv()
449 	WARN_ON(fs_info->delayed_block_rsv.reserved > 0);  in btrfs_release_global_block_rsv()
450 	WARN_ON(fs_info->delayed_refs_rsv.reserved > 0);  in btrfs_release_global_block_rsv()