feoxdb/
constants.rs

1use std::time::Duration;
2
3// Size units
4pub const KB: usize = 1024;
5pub const MB: usize = 1024 * KB;
6pub const GB: usize = 1024 * MB;
7
8// Size limits
9pub const MAX_KEY_SIZE: usize = 100 * KB;
10pub const MAX_VALUE_SIZE: usize = 4 * MB;
11pub const DEFAULT_MAX_MEMORY: usize = 4 * GB;
12
13// Memory alignment
14pub const PAGE_SIZE: usize = 4096;
15pub const PAGE_MASK: usize = PAGE_SIZE - 1;
16pub const MAX_CONNECTIONS: usize = 1000;
17
18// Hash table configuration
19pub const DEFAULT_HASH_BITS: u32 = 23;
20pub const KV_STORE_BUCKETS: usize = 1 << DEFAULT_HASH_BITS; // 8M buckets
21pub const HASH_SPINLOCKS_COUNT: usize = 256;
22pub const CACHE_BUCKETS: usize = 16384;
23
24// Block and sector sizes
25pub const FEOX_BLOCK_SIZE: usize = 4096;
26pub const SECTOR_SHIFT: usize = 9;
27pub const SECTOR_SIZE: usize = 512;
28pub const SECTOR_HEADER_SIZE: usize = 4;
29pub const SECTOR_MARKER: u16 = 0xABCD;
30
31// Metadata
32pub const FEOX_SIGNATURE: &[u8; 8] = b"FEOX_SIG";
33pub const FEOX_SIGNATURE_SIZE: usize = 8;
34pub const FEOX_METADATA_BLOCK: u64 = 0;
35pub const FEOX_METADATA_SIZE: usize = PAGE_SIZE;
36pub const FEOX_DATA_START_BLOCK: u64 = 16;
37pub const FEOX_WRITE_BUFFER_SIZE: usize = 16 * MB;
38pub const FEOX_ALIGNMENT: usize = 512;
39
40// Memory allocation thresholds
41pub const KMALLOC_LIMIT: usize = 8192;
42pub const LARGE_ALLOC_THRESHOLD: usize = 8192;
43
44// Write buffer configuration
45pub const WRITE_BUFFER_SIZE: usize = 1024;
46pub const WRITE_BUFFER_FLUSH_INTERVAL: Duration = Duration::from_millis(100);
47pub const WORK_TIMEOUT_MS: u64 = 5000;
48pub const WRITE_BUFFER_WORKER_RATIO: usize = 2;
49
50// Cache configuration
51pub const CACHE_HIGH_WATERMARK_MB: usize = 100;
52pub const CACHE_LOW_WATERMARK_MB: usize = 50;
53pub const CACHE_MAX_SIZE: usize = GB; // 1GB max cache
54pub const CACHE_ADJUST_INTERVAL: Duration = Duration::from_secs(5);
55pub const CACHE_CLOCK_HAND_ADVANCE: usize = 100;
56
57// Tenant configuration
58pub const TENANT_ID_SIZE: usize = 4;
59
60// Device limits
61pub const MAX_DEVICE_SIZE: u64 = 1u64 << 40; // 1TB
62pub const DEFAULT_DEVICE_SIZE: u64 = GB as u64; // 1GB default
63
64// io_uring configuration
65pub const IOURING_QUEUE_SIZE: u32 = 256;
66pub const IOURING_MAX_BATCH: usize = 128; // Safely under queue size
67pub const IOURING_SQPOLL_IDLE_MS: u32 = 1000;
68
69// Operation types
70#[derive(Debug, Clone, Copy, PartialEq, Eq)]
71pub enum Operation {
72    Insert,
73    Update,
74    Delete,
75    Get,
76    PartialUpdate,
77}
78
79// POSIX error codes
80pub const EINVAL: i32 = 22;
81pub const ENOMEM: i32 = 12;
82pub const ENOENT: i32 = 2;
83pub const EEXIST: i32 = 17;
84pub const EAGAIN: i32 = 11;
85pub const ENOSPC: i32 = 28;
86pub const EMSGSIZE: i32 = 90;
87pub const EOVERFLOW: i32 = 75;
88pub const EIO: i32 = 5;
89pub const EFAULT: i32 = 14;
90pub const ENOTEMPTY: i32 = 39;
91pub const ENODEV: i32 = 19;
feoxdb/constants.rs

feoxdb/
constants.rs
