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