97 lines
2.7 KiB
C
97 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright 2023 Red Hat
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*/
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#ifndef VDO_CONSTANTS_H
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#define VDO_CONSTANTS_H
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#include <linux/blkdev.h>
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#include "types.h"
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enum {
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/*
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* The maximum number of contiguous PBNs which will go to a single bio submission queue,
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* assuming there is more than one queue.
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*/
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VDO_BIO_ROTATION_INTERVAL_LIMIT = 1024,
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/* The number of entries on a block map page */
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VDO_BLOCK_MAP_ENTRIES_PER_PAGE = 812,
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/* The origin of the flat portion of the block map */
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VDO_BLOCK_MAP_FLAT_PAGE_ORIGIN = 1,
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/*
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* The height of a block map tree. Assuming a root count of 60 and 812 entries per page,
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* this is big enough to represent almost 95 PB of logical space.
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*/
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VDO_BLOCK_MAP_TREE_HEIGHT = 5,
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/* The default number of bio submission queues. */
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DEFAULT_VDO_BIO_SUBMIT_QUEUE_COUNT = 4,
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/* The number of contiguous PBNs to be submitted to a single bio queue. */
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DEFAULT_VDO_BIO_SUBMIT_QUEUE_ROTATE_INTERVAL = 64,
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/* The number of trees in the arboreal block map */
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DEFAULT_VDO_BLOCK_MAP_TREE_ROOT_COUNT = 60,
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/* The default size of the recovery journal, in blocks */
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DEFAULT_VDO_RECOVERY_JOURNAL_SIZE = 32 * 1024,
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/* The default size of each slab journal, in blocks */
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DEFAULT_VDO_SLAB_JOURNAL_SIZE = 224,
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/* Unit test minimum */
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MINIMUM_VDO_SLAB_JOURNAL_BLOCKS = 2,
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/*
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* The initial size of lbn_operations and pbn_operations, which is based upon the expected
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* maximum number of outstanding VIOs. This value was chosen to make it highly unlikely
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* that the maps would need to be resized.
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*/
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VDO_LOCK_MAP_CAPACITY = 10000,
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/* The maximum number of logical zones */
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MAX_VDO_LOGICAL_ZONES = 60,
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/* The maximum number of physical zones */
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MAX_VDO_PHYSICAL_ZONES = 16,
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/* The base-2 logarithm of the maximum blocks in one slab */
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MAX_VDO_SLAB_BITS = 23,
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/* The maximum number of slabs the slab depot supports */
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MAX_VDO_SLABS = 8192,
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/*
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* The maximum number of block map pages to load simultaneously during recovery or rebuild.
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*/
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MAXIMUM_SIMULTANEOUS_VDO_BLOCK_MAP_RESTORATION_READS = 1024,
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/* The maximum number of entries in the slab summary */
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MAXIMUM_VDO_SLAB_SUMMARY_ENTRIES = MAX_VDO_SLABS * MAX_VDO_PHYSICAL_ZONES,
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/* The maximum number of total threads in a VDO thread configuration. */
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MAXIMUM_VDO_THREADS = 100,
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/* The maximum number of VIOs in the system at once */
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MAXIMUM_VDO_USER_VIOS = 2048,
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/* The only physical block size supported by VDO */
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VDO_BLOCK_SIZE = 4096,
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/* The number of sectors per block */
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VDO_SECTORS_PER_BLOCK = (VDO_BLOCK_SIZE >> SECTOR_SHIFT),
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/* The size of a sector that will not be torn */
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VDO_SECTOR_SIZE = 512,
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/* The physical block number reserved for storing the zero block */
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VDO_ZERO_BLOCK = 0,
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};
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#endif /* VDO_CONSTANTS_H */
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