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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-08-07 13:11:22 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-08-07 13:11:22 +0000 |
commit | b20732900e4636a467c0183a47f7396700f5f743 (patch) | |
tree | 42f079ff82e701ebcb76829974b4caca3e5b6798 /drivers/md/dm-vdo/constants.h | |
parent | Adding upstream version 6.8.12. (diff) | |
download | linux-b20732900e4636a467c0183a47f7396700f5f743.tar.xz linux-b20732900e4636a467c0183a47f7396700f5f743.zip |
Adding upstream version 6.9.7.upstream/6.9.7
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/md/dm-vdo/constants.h')
-rw-r--r-- | drivers/md/dm-vdo/constants.h | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/drivers/md/dm-vdo/constants.h b/drivers/md/dm-vdo/constants.h new file mode 100644 index 0000000000..a8c4d6e24b --- /dev/null +++ b/drivers/md/dm-vdo/constants.h @@ -0,0 +1,96 @@ +/* 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 */ |