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neon/libs/postgres_ffi/src/pg_constants.rs
Arpad Müller a22be5af72 Migrate the last crates to edition 2024 (#10998) 
Migrates the remaining crates to edition 2024. We like to stay on the
latest edition if possible. There is no functional changes, however some
code changes had to be done to accommodate the edition's breaking
changes.

Like the previous migration PRs, this is comprised of three commits:

* the first does the edition update and makes `cargo check`/`cargo
clippy` pass. we had to update bindgen to make its output [satisfy the
requirements of edition
2024](https://doc.rust-lang.org/edition-guide/rust-2024/unsafe-extern.html)
* the second commit does a `cargo fmt` for the new style edition.
* the third commit reorders imports as a one-off change. As before, it
is entirely optional.

Part of #10918
2025-02-27 09:40:40 +00:00

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//!
//! Misc constants, copied from PostgreSQL headers.
//!
//! Only place version-independent constants here.
//!
//! TODO: These probably should be auto-generated using bindgen,
//! rather than copied by hand. Although on the other hand, it's nice
//! to have them all here in one place, and have the ability to add
//! comments on them.
//!
use crate::{BLCKSZ, PageHeaderData};
//
// From pg_tablespace_d.h
//
pub const DEFAULTTABLESPACE_OID: u32 = 1663;
pub const GLOBALTABLESPACE_OID: u32 = 1664;
// From storage_xlog.h
pub const XLOG_SMGR_CREATE: u8 = 0x10;
pub const XLOG_SMGR_TRUNCATE: u8 = 0x20;
pub const SMGR_TRUNCATE_HEAP: u32 = 0x0001;
pub const SMGR_TRUNCATE_VM: u32 = 0x0002;
pub const SMGR_TRUNCATE_FSM: u32 = 0x0004;
//
// From bufpage.h
//
// Assumes 8 byte alignment
const SIZEOF_PAGE_HEADER_DATA: usize = size_of::<PageHeaderData>();
pub const MAXALIGN_SIZE_OF_PAGE_HEADER_DATA: usize = (SIZEOF_PAGE_HEADER_DATA + 7) & !7;
//
// constants from clog.h
//
pub const CLOG_XACTS_PER_BYTE: u32 = 4;
pub const CLOG_XACTS_PER_PAGE: u32 = BLCKSZ as u32 * CLOG_XACTS_PER_BYTE;
pub const CLOG_BITS_PER_XACT: u8 = 2;
pub const CLOG_XACT_BITMASK: u8 = (1 << CLOG_BITS_PER_XACT) - 1;
pub const TRANSACTION_STATUS_COMMITTED: u8 = 0x01;
pub const TRANSACTION_STATUS_ABORTED: u8 = 0x02;
pub const TRANSACTION_STATUS_SUB_COMMITTED: u8 = 0x03;
pub const CLOG_ZEROPAGE: u8 = 0x00;
pub const CLOG_TRUNCATE: u8 = 0x10;
//
// Constants from visibilitymap.h, visibilitymapdefs.h and visibilitymap.c
//
pub const SIZE_OF_PAGE_HEADER: u16 = 24;
pub const BITS_PER_BYTE: u16 = 8;
pub const HEAPBLOCKS_PER_PAGE: u32 =
(BLCKSZ - SIZE_OF_PAGE_HEADER) as u32 * 8 / BITS_PER_HEAPBLOCK as u32;
pub const HEAPBLOCKS_PER_BYTE: u16 = BITS_PER_BYTE / BITS_PER_HEAPBLOCK;
pub const fn HEAPBLK_TO_MAPBLOCK(x: u32) -> u32 {
x / HEAPBLOCKS_PER_PAGE
}
pub const fn HEAPBLK_TO_MAPBYTE(x: u32) -> u32 {
(x % HEAPBLOCKS_PER_PAGE) / HEAPBLOCKS_PER_BYTE as u32
}
pub const fn HEAPBLK_TO_OFFSET(x: u32) -> u32 {
(x % HEAPBLOCKS_PER_BYTE as u32) * BITS_PER_HEAPBLOCK as u32
}
pub const BITS_PER_HEAPBLOCK: u16 = 2;
pub const VISIBILITYMAP_ALL_VISIBLE: u8 = 0x01;
pub const VISIBILITYMAP_ALL_FROZEN: u8 = 0x02;
pub const VISIBILITYMAP_VALID_BITS: u8 = 0x03;
// From xact.h
pub const XLOG_XACT_COMMIT: u8 = 0x00;
pub const XLOG_XACT_PREPARE: u8 = 0x10;
pub const XLOG_XACT_ABORT: u8 = 0x20;
pub const XLOG_XACT_COMMIT_PREPARED: u8 = 0x30;
pub const XLOG_XACT_ABORT_PREPARED: u8 = 0x40;
// From standbydefs.h
pub const XLOG_RUNNING_XACTS: u8 = 0x10;
// From srlu.h
pub const SLRU_PAGES_PER_SEGMENT: u32 = 32;
pub const SLRU_SEG_SIZE: usize = BLCKSZ as usize * SLRU_PAGES_PER_SEGMENT as usize;
/* mask for filtering opcodes out of xl_info */
pub const XLOG_XACT_OPMASK: u8 = 0x70;
pub const XLOG_HEAP_OPMASK: u8 = 0x70;
/* does this record have a 'xinfo' field or not */
pub const XLOG_XACT_HAS_INFO: u8 = 0x80;
/*
* The following flags, stored in xinfo, determine which information is
* contained in commit/abort records.
*/
pub const XACT_XINFO_HAS_DBINFO: u32 = 1u32 << 0;
pub const XACT_XINFO_HAS_SUBXACTS: u32 = 1u32 << 1;
pub const XACT_XINFO_HAS_RELFILENODES: u32 = 1u32 << 2;
pub const XACT_XINFO_HAS_INVALS: u32 = 1u32 << 3;
pub const XACT_XINFO_HAS_TWOPHASE: u32 = 1u32 << 4;
pub const XACT_XINFO_HAS_ORIGIN: u32 = 1u32 << 5;
// pub const XACT_XINFO_HAS_AE_LOCKS: u32 = 1u32 << 6;
// pub const XACT_XINFO_HAS_GID: u32 = 1u32 << 7;
// From pg_control.h and rmgrlist.h
pub const XLOG_NEXTOID: u8 = 0x30;
pub const XLOG_SWITCH: u8 = 0x40;
pub const XLOG_FPI_FOR_HINT: u8 = 0xA0;
pub const XLOG_FPI: u8 = 0xB0;
// From multixact.h
pub const FIRST_MULTIXACT_ID: u32 = 1;
pub const MAX_MULTIXACT_ID: u32 = 0xFFFFFFFF;
pub const MAX_MULTIXACT_OFFSET: u32 = 0xFFFFFFFF;
pub const XLOG_MULTIXACT_ZERO_OFF_PAGE: u8 = 0x00;
pub const XLOG_MULTIXACT_ZERO_MEM_PAGE: u8 = 0x10;
pub const XLOG_MULTIXACT_CREATE_ID: u8 = 0x20;
pub const XLOG_MULTIXACT_TRUNCATE_ID: u8 = 0x30;
pub const MULTIXACT_OFFSETS_PER_PAGE: u16 = BLCKSZ / 4;
pub const MXACT_MEMBER_BITS_PER_XACT: u16 = 8;
pub const MXACT_MEMBER_FLAGS_PER_BYTE: u16 = 1;
pub const MULTIXACT_FLAGBYTES_PER_GROUP: u16 = 4;
pub const MULTIXACT_MEMBERS_PER_MEMBERGROUP: u16 =
MULTIXACT_FLAGBYTES_PER_GROUP * MXACT_MEMBER_FLAGS_PER_BYTE;
/* size in bytes of a complete group */
pub const MULTIXACT_MEMBERGROUP_SIZE: u16 =
4 * MULTIXACT_MEMBERS_PER_MEMBERGROUP + MULTIXACT_FLAGBYTES_PER_GROUP;
pub const MULTIXACT_MEMBERGROUPS_PER_PAGE: u16 = BLCKSZ / MULTIXACT_MEMBERGROUP_SIZE;
pub const MULTIXACT_MEMBERS_PER_PAGE: u16 =
MULTIXACT_MEMBERGROUPS_PER_PAGE * MULTIXACT_MEMBERS_PER_MEMBERGROUP;
// From heapam_xlog.h
pub const XLOG_HEAP_INSERT: u8 = 0x00;
pub const XLOG_HEAP_DELETE: u8 = 0x10;
pub const XLOG_HEAP_UPDATE: u8 = 0x20;
pub const XLOG_HEAP_HOT_UPDATE: u8 = 0x40;
pub const XLOG_HEAP_LOCK: u8 = 0x60;
pub const XLOG_HEAP_INIT_PAGE: u8 = 0x80;
pub const XLOG_HEAP2_VISIBLE: u8 = 0x40;
pub const XLOG_HEAP2_MULTI_INSERT: u8 = 0x50;
pub const XLOG_HEAP2_LOCK_UPDATED: u8 = 0x60;
pub const XLH_LOCK_ALL_FROZEN_CLEARED: u8 = 0x01;
pub const XLH_INSERT_ALL_FROZEN_SET: u8 = (1 << 5) as u8;
pub const XLH_INSERT_ALL_VISIBLE_CLEARED: u8 = (1 << 0) as u8;
pub const XLH_UPDATE_OLD_ALL_VISIBLE_CLEARED: u8 = (1 << 0) as u8;
pub const XLH_UPDATE_NEW_ALL_VISIBLE_CLEARED: u8 = (1 << 1) as u8;
pub const XLH_DELETE_ALL_VISIBLE_CLEARED: u8 = (1 << 0) as u8;
// From heapam_xlog.h
pub const XLOG_HEAP2_REWRITE: u8 = 0x00;
// From replication/message.h
pub const XLOG_LOGICAL_MESSAGE: u8 = 0x00;
// From rmgrlist.h
pub const RM_XLOG_ID: u8 = 0;
pub const RM_XACT_ID: u8 = 1;
pub const RM_SMGR_ID: u8 = 2;
pub const RM_CLOG_ID: u8 = 3;
pub const RM_DBASE_ID: u8 = 4;
pub const RM_TBLSPC_ID: u8 = 5;
pub const RM_MULTIXACT_ID: u8 = 6;
pub const RM_RELMAP_ID: u8 = 7;
pub const RM_STANDBY_ID: u8 = 8;
pub const RM_HEAP2_ID: u8 = 9;
pub const RM_HEAP_ID: u8 = 10;
pub const RM_REPLORIGIN_ID: u8 = 19;
pub const RM_LOGICALMSG_ID: u8 = 21;
// from neon_rmgr.h
pub const RM_NEON_ID: u8 = 134;
pub const XLOG_NEON_HEAP_INIT_PAGE: u8 = 0x80;
pub const XLOG_NEON_HEAP_INSERT: u8 = 0x00;
pub const XLOG_NEON_HEAP_DELETE: u8 = 0x10;
pub const XLOG_NEON_HEAP_UPDATE: u8 = 0x20;
pub const XLOG_NEON_HEAP_HOT_UPDATE: u8 = 0x30;
pub const XLOG_NEON_HEAP_LOCK: u8 = 0x40;
pub const XLOG_NEON_HEAP_MULTI_INSERT: u8 = 0x50;
pub const XLOG_NEON_HEAP_VISIBLE: u8 = 0x40;
// from xlogreader.h
pub const XLR_INFO_MASK: u8 = 0x0F;
pub const XLR_RMGR_INFO_MASK: u8 = 0xF0;
pub const XLOG_TBLSPC_CREATE: u8 = 0x00;
pub const XLOG_TBLSPC_DROP: u8 = 0x10;
//
// from xlogrecord.h
//
pub const XLR_MAX_BLOCK_ID: u8 = 32;
pub const XLR_BLOCK_ID_DATA_SHORT: u8 = 255;
pub const XLR_BLOCK_ID_DATA_LONG: u8 = 254;
pub const XLR_BLOCK_ID_ORIGIN: u8 = 253;
pub const XLR_BLOCK_ID_TOPLEVEL_XID: u8 = 252;
pub const BKPBLOCK_FORK_MASK: u8 = 0x0F;
pub const _BKPBLOCK_FLAG_MASK: u8 = 0xF0;
pub const BKPBLOCK_HAS_IMAGE: u8 = 0x10; /* block data is an XLogRecordBlockImage */
pub const BKPBLOCK_HAS_DATA: u8 = 0x20;
pub const BKPBLOCK_WILL_INIT: u8 = 0x40; /* redo will re-init the page */
pub const BKPBLOCK_SAME_REL: u8 = 0x80; /* RelFileNode omitted, same as previous */
/* Information stored in bimg_info */
pub const BKPIMAGE_HAS_HOLE: u8 = 0x01; /* page image has "hole" */
/* From transam.h */
pub const FIRST_NORMAL_TRANSACTION_ID: u32 = 3;
pub const INVALID_TRANSACTION_ID: u32 = 0;
/* pg_control.h */
pub const XLOG_CHECKPOINT_SHUTDOWN: u8 = 0x00;
pub const XLOG_CHECKPOINT_ONLINE: u8 = 0x10;
pub const XLOG_PARAMETER_CHANGE: u8 = 0x60;
pub const XLOG_END_OF_RECOVERY: u8 = 0x90;
/* From xlog.h */
pub const XLOG_REPLORIGIN_SET: u8 = 0x00;
pub const XLOG_REPLORIGIN_DROP: u8 = 0x10;
/* xlog_internal.h */
pub const XLP_FIRST_IS_CONTRECORD: u16 = 0x0001;
pub const XLP_LONG_HEADER: u16 = 0x0002;
/* From replication/slot.h */
pub const REPL_SLOT_ON_DISK_OFFSETOF_RESTART_LSN: usize = 4*4 /* offset of `slotdata` in ReplicationSlotOnDisk */
+ 64 /* NameData */ + 4*4;
/* From fsm_internals.h */
const FSM_NODES_PER_PAGE: usize = BLCKSZ as usize - SIZEOF_PAGE_HEADER_DATA - 4;
const FSM_NON_LEAF_NODES_PER_PAGE: usize = BLCKSZ as usize / 2 - 1;
const FSM_LEAF_NODES_PER_PAGE: usize = FSM_NODES_PER_PAGE - FSM_NON_LEAF_NODES_PER_PAGE;
pub const SLOTS_PER_FSM_PAGE: u32 = FSM_LEAF_NODES_PER_PAGE as u32;
/* From visibilitymap.c */
pub const VM_MAPSIZE: usize = BLCKSZ as usize - MAXALIGN_SIZE_OF_PAGE_HEADER_DATA;
pub const VM_BITS_PER_HEAPBLOCK: usize = 2;
pub const VM_HEAPBLOCKS_PER_BYTE: usize = 8 / VM_BITS_PER_HEAPBLOCK;
pub const VM_HEAPBLOCKS_PER_PAGE: usize = VM_MAPSIZE * VM_HEAPBLOCKS_PER_BYTE;
/* From origin.c */
pub const REPLICATION_STATE_MAGIC: u32 = 0x1257DADE;
// Don't include postgresql.conf as it is inconvenient on node start:
// we need postgresql.conf before basebackup to synchronize safekeepers
// so no point in overwriting it during backup restore. Rest of the files
// here are not needed before backup so it is okay to edit them after.
pub const PGDATA_SPECIAL_FILES: [&str; 3] =
["pg_hba.conf", "pg_ident.conf", "postgresql.auto.conf"];
pub static PG_HBA: &str = include_str!("../samples/pg_hba.conf");
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