mirror of
https://github.com/torvalds/linux.git
synced 2024-11-23 12:42:02 +00:00
571eff3969
Use /* ... */ rather than /** ... */ if for no other reason than syntax highlighting is improved (at least for me, in emacs: comments are now red, code is yellow. Previously comments were also yellow). Signed-off-by: Mike Snitzer <snitzer@kernel.org> Signed-off-by: Susan LeGendre-McGhee <slegendr@redhat.com> Signed-off-by: Matthew Sakai <msakai@redhat.com>
97 lines
2.7 KiB
C
97 lines
2.7 KiB
C
/* 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 */
|