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e6e883eb12
* Do not set LSN for new FPI page refer #1656 * Add page_is_new, page_get_lsn, page_set_lsn functions * Fix page_is_new implementation * Add comment from XLogReadBufferForRedoExtended
59 lines
1.7 KiB
Rust
59 lines
1.7 KiB
Rust
#![allow(non_upper_case_globals)]
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#![allow(non_camel_case_types)]
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#![allow(non_snake_case)]
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// bindgen creates some unsafe code with no doc comments.
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#![allow(clippy::missing_safety_doc)]
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// suppress warnings on rust 1.53 due to bindgen unit tests.
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// https://github.com/rust-lang/rust-bindgen/issues/1651
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#![allow(deref_nullptr)]
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use serde::{Deserialize, Serialize};
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use utils::lsn::Lsn;
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include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
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pub mod controlfile_utils;
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pub mod nonrelfile_utils;
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pub mod pg_constants;
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pub mod relfile_utils;
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pub mod waldecoder;
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pub mod xlog_utils;
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// See TransactionIdIsNormal in transam.h
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pub const fn transaction_id_is_normal(id: TransactionId) -> bool {
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id > pg_constants::FIRST_NORMAL_TRANSACTION_ID
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}
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// See TransactionIdPrecedes in transam.c
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pub const fn transaction_id_precedes(id1: TransactionId, id2: TransactionId) -> bool {
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/*
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* If either ID is a permanent XID then we can just do unsigned
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* comparison. If both are normal, do a modulo-2^32 comparison.
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*/
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if !(transaction_id_is_normal(id1)) || !transaction_id_is_normal(id2) {
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return id1 < id2;
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}
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let diff = id1.wrapping_sub(id2) as i32;
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diff < 0
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}
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// Check if page is not yet initialized (port of Postgres PageIsInit() macro)
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pub fn page_is_new(pg: &[u8]) -> bool {
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pg[14] == 0 && pg[15] == 0 // pg_upper == 0
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}
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// ExtractLSN from page header
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pub fn page_get_lsn(pg: &[u8]) -> Lsn {
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Lsn(
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((u32::from_le_bytes(pg[0..4].try_into().unwrap()) as u64) << 32)
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| u32::from_le_bytes(pg[4..8].try_into().unwrap()) as u64,
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)
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}
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pub fn page_set_lsn(pg: &mut [u8], lsn: Lsn) {
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pg[0..4].copy_from_slice(&((lsn.0 >> 32) as u32).to_le_bytes());
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pg[4..8].copy_from_slice(&(lsn.0 as u32).to_le_bytes());
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}
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