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1/* SPDX-License-Identifier: GPL-2.0-only */2/*3 * Copyright 2023 Red Hat4 */5 6#ifndef VDO_CONSTANTS_H7#define VDO_CONSTANTS_H8 9#include <linux/blkdev.h>10 11#include "types.h"12 13enum {14 /*15 * The maximum number of contiguous PBNs which will go to a single bio submission queue,16 * assuming there is more than one queue.17 */18 VDO_BIO_ROTATION_INTERVAL_LIMIT = 1024,19 20 /* The number of entries on a block map page */21 VDO_BLOCK_MAP_ENTRIES_PER_PAGE = 812,22 23 /* The origin of the flat portion of the block map */24 VDO_BLOCK_MAP_FLAT_PAGE_ORIGIN = 1,25 26 /*27 * The height of a block map tree. Assuming a root count of 60 and 812 entries per page,28 * this is big enough to represent almost 95 PB of logical space.29 */30 VDO_BLOCK_MAP_TREE_HEIGHT = 5,31 32 /* The default number of bio submission queues. */33 DEFAULT_VDO_BIO_SUBMIT_QUEUE_COUNT = 4,34 35 /* The number of contiguous PBNs to be submitted to a single bio queue. */36 DEFAULT_VDO_BIO_SUBMIT_QUEUE_ROTATE_INTERVAL = 64,37 38 /* The number of trees in the arboreal block map */39 DEFAULT_VDO_BLOCK_MAP_TREE_ROOT_COUNT = 60,40 41 /* The default size of the recovery journal, in blocks */42 DEFAULT_VDO_RECOVERY_JOURNAL_SIZE = 32 * 1024,43 44 /* The default size of each slab journal, in blocks */45 DEFAULT_VDO_SLAB_JOURNAL_SIZE = 224,46 47 /* Unit test minimum */48 MINIMUM_VDO_SLAB_JOURNAL_BLOCKS = 2,49 50 /*51 * The initial size of lbn_operations and pbn_operations, which is based upon the expected52 * maximum number of outstanding VIOs. This value was chosen to make it highly unlikely53 * that the maps would need to be resized.54 */55 VDO_LOCK_MAP_CAPACITY = 10000,56 57 /* The maximum number of logical zones */58 MAX_VDO_LOGICAL_ZONES = 60,59 60 /* The maximum number of physical zones */61 MAX_VDO_PHYSICAL_ZONES = 16,62 63 /* The base-2 logarithm of the maximum blocks in one slab */64 MAX_VDO_SLAB_BITS = 23,65 66 /* The maximum number of slabs the slab depot supports */67 MAX_VDO_SLABS = 8192,68 69 /*70 * The maximum number of block map pages to load simultaneously during recovery or rebuild.71 */72 MAXIMUM_SIMULTANEOUS_VDO_BLOCK_MAP_RESTORATION_READS = 1024,73 74 /* The maximum number of entries in the slab summary */75 MAXIMUM_VDO_SLAB_SUMMARY_ENTRIES = MAX_VDO_SLABS * MAX_VDO_PHYSICAL_ZONES,76 77 /* The maximum number of total threads in a VDO thread configuration. */78 MAXIMUM_VDO_THREADS = 100,79 80 /* The maximum number of VIOs in the system at once */81 MAXIMUM_VDO_USER_VIOS = 2048,82 83 /* The only physical block size supported by VDO */84 VDO_BLOCK_SIZE = 4096,85 86 /* The number of sectors per block */87 VDO_SECTORS_PER_BLOCK = (VDO_BLOCK_SIZE >> SECTOR_SHIFT),88 89 /* The size of a sector that will not be torn */90 VDO_SECTOR_SIZE = 512,91 92 /* The physical block number reserved for storing the zero block */93 VDO_ZERO_BLOCK = 0,94};95 96#endif /* VDO_CONSTANTS_H */97