Use enum-typed PG versions (#12317)

This makes it possible for the compiler to validate that a match block
matched all PostgreSQL versions we support.

## Problem
We did not have a complete picture about which places we had to test
against PG versions, and what format these versions were: The full PG
version ID format (Major/minor/bugfix `MMmmbb`) as transfered in
protocol messages, or only the Major release version (`MM`). This meant
type confusion was rampant.

With this change, it becomes easier to develop new version-dependent
features, by making type and niche confusion impossible.

## Summary of changes
Every use of `pg_version` is now typed as either `PgVersionId` (u32,
valued in decimal `MMmmbb`) or PgMajorVersion (an enum, with a value for
every major version we support, serialized and stored like a u32 with
the value of that major version)

---------

Co-authored-by: Arpad Müller <arpad-m@users.noreply.github.com>

Cargo.lock

@@ -1318,6 +1318,7 @@ dependencies = [
  "p256 0.13.2",
  "postgres",
  "postgres_initdb",
+ "postgres_versioninfo",
  "regex",
  "remote_storage",
  "reqwest",
@@ -4406,6 +4407,7 @@ dependencies = [
  "once_cell",
  "postgres_backend",
  "postgres_ffi_types",
+ "postgres_versioninfo",
  "rand 0.8.5",
  "remote_storage",
  "reqwest",
@@ -4429,6 +4431,7 @@ dependencies = [
  "futures",
  "http-utils",
  "pageserver_api",
+ "postgres_versioninfo",
  "reqwest",
  "serde",
  "thiserror 1.0.69",
@@ -4897,6 +4900,7 @@ dependencies = [
  "once_cell",
  "postgres",
  "postgres_ffi_types",
+ "postgres_versioninfo",
  "pprof",
  "regex",
  "serde",
@@ -4919,11 +4923,23 @@ version = "0.1.0"
 dependencies = [
  "anyhow",
  "camino",
+ "postgres_versioninfo",
  "thiserror 1.0.69",
  "tokio",
  "workspace_hack",
 ]
 
+[[package]]
+name = "postgres_versioninfo"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+ "serde",
+ "serde_repr",
+ "thiserror 1.0.69",
+ "workspace_hack",
+]
+
 [[package]]
 name = "posthog_client_lite"
 version = "0.1.0"
@@ -6115,6 +6131,7 @@ dependencies = [
  "postgres-protocol",
  "postgres_backend",
  "postgres_ffi",
+ "postgres_versioninfo",
  "pprof",
  "pq_proto",
  "rand 0.8.5",
@@ -6159,6 +6176,7 @@ dependencies = [
  "const_format",
  "pageserver_api",
  "postgres_ffi",
+ "postgres_versioninfo",
  "pq_proto",
  "serde",
  "serde_json",
@@ -6481,6 +6499,17 @@ dependencies = [
  "thiserror 1.0.69",
 ]
 
+[[package]]
+name = "serde_repr"
+version = "0.1.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "175ee3e80ae9982737ca543e96133087cbd9a485eecc3bc4de9c1a37b47ea59c"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.100",
+]
+
 [[package]]
 name = "serde_spanned"
 version = "0.6.6"

Cargo.toml

@@ -23,6 +23,7 @@ members = [
     "libs/pageserver_api",
     "libs/postgres_ffi",
     "libs/postgres_ffi_types",
+    "libs/postgres_versioninfo",
     "libs/safekeeper_api",
     "libs/desim",
     "libs/neon-shmem",
@@ -174,6 +175,7 @@ serde_json = "1"
 serde_path_to_error = "0.1"
 serde_with = { version = "3", features = [ "base64" ] }
 serde_assert = "0.5.0"
+serde_repr = "0.1.20"
 sha2 = "0.10.2"
 signal-hook = "0.3"
 smallvec = "1.11"
@@ -261,6 +263,7 @@ postgres_backend = { version = "0.1", path = "./libs/postgres_backend/" }
 postgres_connection = { version = "0.1", path = "./libs/postgres_connection/" }
 postgres_ffi = { version = "0.1", path = "./libs/postgres_ffi/" }
 postgres_ffi_types = { version = "0.1", path = "./libs/postgres_ffi_types/" }
+postgres_versioninfo = { version = "0.1", path = "./libs/postgres_versioninfo/" }
 postgres_initdb = { path = "./libs/postgres_initdb" }
 posthog_client_lite = { version = "0.1", path = "./libs/posthog_client_lite" }
 pq_proto = { version = "0.1", path = "./libs/pq_proto/" }

compute_tools/Cargo.toml

@@ -64,6 +64,7 @@ uuid.workspace = true
 walkdir.workspace = true
 x509-cert.workspace = true
 
+postgres_versioninfo.workspace = true
 postgres_initdb.workspace = true
 compute_api.workspace = true
 utils.workspace = true

compute_tools/src/bin/fast_import.rs

@@ -29,7 +29,7 @@ use anyhow::{Context, bail};
 use aws_config::BehaviorVersion;
 use camino::{Utf8Path, Utf8PathBuf};
 use clap::{Parser, Subcommand};
-use compute_tools::extension_server::{PostgresMajorVersion, get_pg_version};
+use compute_tools::extension_server::get_pg_version;
 use nix::unistd::Pid;
 use std::ops::Not;
 use tracing::{Instrument, error, info, info_span, warn};
@@ -179,12 +179,8 @@ impl PostgresProcess {
             .await
             .context("create pgdata directory")?;
 
-        let pg_version = match get_pg_version(self.pgbin.as_ref()) {
+        let pg_version = get_pg_version(self.pgbin.as_ref());
-            PostgresMajorVersion::V14 => 14,
+
-            PostgresMajorVersion::V15 => 15,
-            PostgresMajorVersion::V16 => 16,
-            PostgresMajorVersion::V17 => 17,
-        };
         postgres_initdb::do_run_initdb(postgres_initdb::RunInitdbArgs {
             superuser: initdb_user,
             locale: DEFAULT_LOCALE, // XXX: this shouldn't be hard-coded,

compute_tools/src/extension_server.rs

@@ -74,9 +74,11 @@ More specifically, here is an example ext_index.json
 use std::path::Path;
 use std::str;
 
+use crate::metrics::{REMOTE_EXT_REQUESTS_TOTAL, UNKNOWN_HTTP_STATUS};
 use anyhow::{Context, Result, bail};
 use bytes::Bytes;
 use compute_api::spec::RemoteExtSpec;
+use postgres_versioninfo::PgMajorVersion;
 use regex::Regex;
 use remote_storage::*;
 use reqwest::StatusCode;
@@ -86,8 +88,6 @@ use tracing::log::warn;
 use url::Url;
 use zstd::stream::read::Decoder;
 
-use crate::metrics::{REMOTE_EXT_REQUESTS_TOTAL, UNKNOWN_HTTP_STATUS};
-
 fn get_pg_config(argument: &str, pgbin: &str) -> String {
     // gives the result of `pg_config [argument]`
     // where argument is a flag like `--version` or `--sharedir`
@@ -106,7 +106,7 @@ fn get_pg_config(argument: &str, pgbin: &str) -> String {
         .to_string()
 }
 
-pub fn get_pg_version(pgbin: &str) -> PostgresMajorVersion {
+pub fn get_pg_version(pgbin: &str) -> PgMajorVersion {
     // pg_config --version returns a (platform specific) human readable string
     // such as "PostgreSQL 15.4". We parse this to v14/v15/v16 etc.
     let human_version = get_pg_config("--version", pgbin);
@@ -114,25 +114,11 @@ pub fn get_pg_version(pgbin: &str) -> PostgresMajorVersion {
 }
 
 pub fn get_pg_version_string(pgbin: &str) -> String {
-    match get_pg_version(pgbin) {
+    get_pg_version(pgbin).v_str()
-        PostgresMajorVersion::V14 => "v14",
-        PostgresMajorVersion::V15 => "v15",
-        PostgresMajorVersion::V16 => "v16",
-        PostgresMajorVersion::V17 => "v17",
-    }
-    .to_owned()
 }
 
-#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+fn parse_pg_version(human_version: &str) -> PgMajorVersion {
-pub enum PostgresMajorVersion {
+    use PgMajorVersion::*;
-    V14,
-    V15,
-    V16,
-    V17,
-}
-
-fn parse_pg_version(human_version: &str) -> PostgresMajorVersion {
-    use PostgresMajorVersion::*;
     // Normal releases have version strings like "PostgreSQL 15.4". But there
     // are also pre-release versions like "PostgreSQL 17devel" or "PostgreSQL
     // 16beta2" or "PostgreSQL 17rc1". And with the --with-extra-version
@@ -143,10 +129,10 @@ fn parse_pg_version(human_version: &str) -> PostgresMajorVersion {
         .captures(human_version)
     {
         Some(captures) if captures.len() == 2 => match &captures["major"] {
-            "14" => return V14,
+            "14" => return PG14,
-            "15" => return V15,
+            "15" => return PG15,
-            "16" => return V16,
+            "16" => return PG16,
-            "17" => return V17,
+            "17" => return PG17,
             _ => {}
         },
         _ => {}
@@ -343,25 +329,25 @@ mod tests {
 
     #[test]
     fn test_parse_pg_version() {
-        use super::PostgresMajorVersion::*;
+        use postgres_versioninfo::PgMajorVersion::*;
-        assert_eq!(parse_pg_version("PostgreSQL 15.4"), V15);
+        assert_eq!(parse_pg_version("PostgreSQL 15.4"), PG15);
-        assert_eq!(parse_pg_version("PostgreSQL 15.14"), V15);
+        assert_eq!(parse_pg_version("PostgreSQL 15.14"), PG15);
         assert_eq!(
             parse_pg_version("PostgreSQL 15.4 (Ubuntu 15.4-0ubuntu0.23.04.1)"),
-            V15
+            PG15
         );
 
-        assert_eq!(parse_pg_version("PostgreSQL 14.15"), V14);
+        assert_eq!(parse_pg_version("PostgreSQL 14.15"), PG14);
-        assert_eq!(parse_pg_version("PostgreSQL 14.0"), V14);
+        assert_eq!(parse_pg_version("PostgreSQL 14.0"), PG14);
         assert_eq!(
             parse_pg_version("PostgreSQL 14.9 (Debian 14.9-1.pgdg120+1"),
-            V14
+            PG14
         );
 
-        assert_eq!(parse_pg_version("PostgreSQL 16devel"), V16);
+        assert_eq!(parse_pg_version("PostgreSQL 16devel"), PG16);
-        assert_eq!(parse_pg_version("PostgreSQL 16beta1"), V16);
+        assert_eq!(parse_pg_version("PostgreSQL 16beta1"), PG16);
-        assert_eq!(parse_pg_version("PostgreSQL 16rc2"), V16);
+        assert_eq!(parse_pg_version("PostgreSQL 16rc2"), PG16);
-        assert_eq!(parse_pg_version("PostgreSQL 16extra"), V16);
+        assert_eq!(parse_pg_version("PostgreSQL 16extra"), PG16);
     }
 
     #[test]

control_plane/src/bin/neon_local.rs

@@ -48,7 +48,7 @@ use postgres_connection::parse_host_port;
 use safekeeper_api::membership::{SafekeeperGeneration, SafekeeperId};
 use safekeeper_api::{
     DEFAULT_HTTP_LISTEN_PORT as DEFAULT_SAFEKEEPER_HTTP_PORT,
-    DEFAULT_PG_LISTEN_PORT as DEFAULT_SAFEKEEPER_PG_PORT,
+    DEFAULT_PG_LISTEN_PORT as DEFAULT_SAFEKEEPER_PG_PORT, PgMajorVersion, PgVersionId,
 };
 use storage_broker::DEFAULT_LISTEN_ADDR as DEFAULT_BROKER_ADDR;
 use tokio::task::JoinSet;
@@ -64,7 +64,7 @@ const DEFAULT_PAGESERVER_ID: NodeId = NodeId(1);
 const DEFAULT_BRANCH_NAME: &str = "main";
 project_git_version!(GIT_VERSION);
 
-const DEFAULT_PG_VERSION: u32 = 17;
+const DEFAULT_PG_VERSION: PgMajorVersion = PgMajorVersion::PG17;
 
 const DEFAULT_PAGESERVER_CONTROL_PLANE_API: &str = "http://127.0.0.1:1234/upcall/v1/";
 
@@ -169,7 +169,7 @@ struct TenantCreateCmdArgs {
 
     #[arg(default_value_t = DEFAULT_PG_VERSION)]
     #[clap(long, help = "Postgres version to use for the initial timeline")]
-    pg_version: u32,
+    pg_version: PgMajorVersion,
 
     #[clap(
         long,
@@ -292,7 +292,7 @@ struct TimelineCreateCmdArgs {
 
     #[arg(default_value_t = DEFAULT_PG_VERSION)]
     #[clap(long, help = "Postgres version")]
-    pg_version: u32,
+    pg_version: PgMajorVersion,
 }
 
 #[derive(clap::Args)]
@@ -324,7 +324,7 @@ struct TimelineImportCmdArgs {
 
     #[arg(default_value_t = DEFAULT_PG_VERSION)]
     #[clap(long, help = "Postgres version of the backup being imported")]
-    pg_version: u32,
+    pg_version: PgMajorVersion,
 }
 
 #[derive(clap::Subcommand)]
@@ -603,7 +603,7 @@ struct EndpointCreateCmdArgs {
 
     #[arg(default_value_t = DEFAULT_PG_VERSION)]
     #[clap(long, help = "Postgres version")]
-    pg_version: u32,
+    pg_version: PgMajorVersion,
 
     /// Use gRPC to communicate with Pageservers, by generating grpc:// connstrings.
     ///
@@ -1295,7 +1295,7 @@ async fn handle_timeline(cmd: &TimelineCmd, env: &mut local_env::LocalEnv) -> Re
                     },
                     new_members: None,
                 };
-                let pg_version = args.pg_version * 10000;
+                let pg_version = PgVersionId::from(args.pg_version);
                 let req = safekeeper_api::models::TimelineCreateRequest {
                     tenant_id,
                     timeline_id,

control_plane/src/endpoint.rs

@@ -67,6 +67,7 @@ use nix::sys::signal::{Signal, kill};
 use pageserver_api::shard::ShardStripeSize;
 use pem::Pem;
 use reqwest::header::CONTENT_TYPE;
+use safekeeper_api::PgMajorVersion;
 use safekeeper_api::membership::SafekeeperGeneration;
 use serde::{Deserialize, Serialize};
 use sha2::{Digest, Sha256};
@@ -89,7 +90,7 @@ pub struct EndpointConf {
     pg_port: u16,
     external_http_port: u16,
     internal_http_port: u16,
-    pg_version: u32,
+    pg_version: PgMajorVersion,
     grpc: bool,
     skip_pg_catalog_updates: bool,
     reconfigure_concurrency: usize,
@@ -192,7 +193,7 @@ impl ComputeControlPlane {
         pg_port: Option<u16>,
         external_http_port: Option<u16>,
         internal_http_port: Option<u16>,
-        pg_version: u32,
+        pg_version: PgMajorVersion,
         mode: ComputeMode,
         grpc: bool,
         skip_pg_catalog_updates: bool,
@@ -312,7 +313,7 @@ pub struct Endpoint {
     pub internal_http_address: SocketAddr,
 
     // postgres major version in the format: 14, 15, etc.
-    pg_version: u32,
+    pg_version: PgMajorVersion,
 
     // These are not part of the endpoint as such, but the environment
     // the endpoint runs in.
@@ -557,7 +558,7 @@ impl Endpoint {
                 conf.append("hot_standby", "on");
                 // prefetching of blocks referenced in WAL doesn't make sense for us
                 // Neon hot standby ignores pages that are not in the shared_buffers
-                if self.pg_version >= 15 {
+                if self.pg_version >= PgMajorVersion::PG15 {
                     conf.append("recovery_prefetch", "off");
                 }
             }

control_plane/src/local_env.rs

@@ -15,6 +15,7 @@ use clap::ValueEnum;
 use pem::Pem;
 use postgres_backend::AuthType;
 use reqwest::{Certificate, Url};
+use safekeeper_api::PgMajorVersion;
 use serde::{Deserialize, Serialize};
 use utils::auth::encode_from_key_file;
 use utils::id::{NodeId, TenantId, TenantTimelineId, TimelineId};
@@ -424,25 +425,21 @@ impl LocalEnv {
         self.pg_distrib_dir.clone()
     }
 
-    pub fn pg_distrib_dir(&self, pg_version: u32) -> anyhow::Result<PathBuf> {
+    pub fn pg_distrib_dir(&self, pg_version: PgMajorVersion) -> anyhow::Result<PathBuf> {
         let path = self.pg_distrib_dir.clone();
 
-        #[allow(clippy::manual_range_patterns)]
+        Ok(path.join(pg_version.v_str()))
-        match pg_version {
-            14 | 15 | 16 | 17 => Ok(path.join(format!("v{pg_version}"))),
-            _ => bail!("Unsupported postgres version: {}", pg_version),
-        }
     }
 
-    pub fn pg_dir(&self, pg_version: u32, dir_name: &str) -> anyhow::Result<PathBuf> {
+    pub fn pg_dir(&self, pg_version: PgMajorVersion, dir_name: &str) -> anyhow::Result<PathBuf> {
         Ok(self.pg_distrib_dir(pg_version)?.join(dir_name))
     }
 
-    pub fn pg_bin_dir(&self, pg_version: u32) -> anyhow::Result<PathBuf> {
+    pub fn pg_bin_dir(&self, pg_version: PgMajorVersion) -> anyhow::Result<PathBuf> {
         self.pg_dir(pg_version, "bin")
     }
 
-    pub fn pg_lib_dir(&self, pg_version: u32) -> anyhow::Result<PathBuf> {
+    pub fn pg_lib_dir(&self, pg_version: PgMajorVersion) -> anyhow::Result<PathBuf> {
         self.pg_dir(pg_version, "lib")
     }
 

control_plane/src/pageserver.rs

@@ -22,6 +22,7 @@ use pageserver_api::shard::TenantShardId;
 use pageserver_client::mgmt_api;
 use postgres_backend::AuthType;
 use postgres_connection::{PgConnectionConfig, parse_host_port};
+use safekeeper_api::PgMajorVersion;
 use utils::auth::{Claims, Scope};
 use utils::id::{NodeId, TenantId, TimelineId};
 use utils::lsn::Lsn;
@@ -607,7 +608,7 @@ impl PageServerNode {
         timeline_id: TimelineId,
         base: (Lsn, PathBuf),
         pg_wal: Option<(Lsn, PathBuf)>,
-        pg_version: u32,
+        pg_version: PgMajorVersion,
     ) -> anyhow::Result<()> {
         // Init base reader
         let (start_lsn, base_tarfile_path) = base;

control_plane/src/storage_controller.rs

@@ -6,6 +6,8 @@ use std::str::FromStr;
 use std::sync::OnceLock;
 use std::time::{Duration, Instant};
 
+use crate::background_process;
+use crate::local_env::{LocalEnv, NeonStorageControllerConf};
 use camino::{Utf8Path, Utf8PathBuf};
 use hyper0::Uri;
 use nix::unistd::Pid;
@@ -22,6 +24,7 @@ use pageserver_client::mgmt_api::ResponseErrorMessageExt;
 use pem::Pem;
 use postgres_backend::AuthType;
 use reqwest::{Method, Response};
+use safekeeper_api::PgMajorVersion;
 use serde::de::DeserializeOwned;
 use serde::{Deserialize, Serialize};
 use tokio::process::Command;
@@ -31,9 +34,6 @@ use utils::auth::{Claims, Scope, encode_from_key_file};
 use utils::id::{NodeId, TenantId};
 use whoami::username;
 
-use crate::background_process;
-use crate::local_env::{LocalEnv, NeonStorageControllerConf};
-
 pub struct StorageController {
     env: LocalEnv,
     private_key: Option<Pem>,
@@ -48,7 +48,7 @@ pub struct StorageController {
 
 const COMMAND: &str = "storage_controller";
 
-const STORAGE_CONTROLLER_POSTGRES_VERSION: u32 = 16;
+const STORAGE_CONTROLLER_POSTGRES_VERSION: PgMajorVersion = PgMajorVersion::PG16;
 
 const DB_NAME: &str = "storage_controller";
 
@@ -184,9 +184,15 @@ impl StorageController {
     /// to other versions if that one isn't found.  Some automated tests create circumstances
     /// where only one version is available in pg_distrib_dir, such as `test_remote_extensions`.
     async fn get_pg_dir(&self, dir_name: &str) -> anyhow::Result<Utf8PathBuf> {
-        let prefer_versions = [STORAGE_CONTROLLER_POSTGRES_VERSION, 16, 15, 14];
+        const PREFER_VERSIONS: [PgMajorVersion; 5] = [
+            STORAGE_CONTROLLER_POSTGRES_VERSION,
+            PgMajorVersion::PG16,
+            PgMajorVersion::PG15,
+            PgMajorVersion::PG14,
+            PgMajorVersion::PG17,
+        ];
 
-        for v in prefer_versions {
+        for v in PREFER_VERSIONS {
             let path = Utf8PathBuf::from_path_buf(self.env.pg_dir(v, dir_name)?).unwrap();
             if tokio::fs::try_exists(&path).await? {
                 return Ok(path);

libs/pageserver_api/Cargo.toml

@@ -18,6 +18,7 @@ bytes.workspace = true
 byteorder.workspace = true
 utils.workspace = true
 postgres_ffi_types.workspace = true
+postgres_versioninfo.workspace = true
 enum-map.workspace = true
 strum.workspace = true
 strum_macros.workspace = true

libs/pageserver_api/src/models.rs

@@ -11,6 +11,7 @@ use std::time::{Duration, SystemTime};
 
 #[cfg(feature = "testing")]
 use camino::Utf8PathBuf;
+use postgres_versioninfo::PgMajorVersion;
 use serde::{Deserialize, Deserializer, Serialize, Serializer};
 use serde_with::serde_as;
 pub use utilization::PageserverUtilization;
@@ -398,7 +399,7 @@ pub enum TimelineCreateRequestMode {
         // inherits the ancestor's pg_version. Earlier code wasn't
         // using a flattened enum, so, it was an accepted field, and
         // we continue to accept it by having it here.
-        pg_version: Option<u32>,
+        pg_version: Option<PgMajorVersion>,
         #[serde(default, skip_serializing_if = "std::ops::Not::not")]
         read_only: bool,
     },
@@ -410,7 +411,7 @@ pub enum TimelineCreateRequestMode {
     Bootstrap {
         #[serde(default)]
         existing_initdb_timeline_id: Option<TimelineId>,
-        pg_version: Option<u32>,
+        pg_version: Option<PgMajorVersion>,
     },
 }
 
@@ -1573,7 +1574,7 @@ pub struct TimelineInfo {
     pub last_received_msg_lsn: Option<Lsn>,
     /// the timestamp (in microseconds) of the last received message
     pub last_received_msg_ts: Option<u128>,
-    pub pg_version: u32,
+    pub pg_version: PgMajorVersion,
 
     pub state: TimelineState,
 

libs/postgres_ffi/Cargo.toml

@@ -19,6 +19,7 @@ serde.workspace = true
 postgres_ffi_types.workspace = true
 utils.workspace = true
 tracing.workspace = true
+postgres_versioninfo.workspace = true
 
 [dev-dependencies]
 env_logger.workspace = true

libs/postgres_ffi/benches/waldecoder.rs

@@ -4,6 +4,7 @@ use criterion::{Bencher, Criterion, criterion_group, criterion_main};
 use postgres_ffi::v17::wal_generator::LogicalMessageGenerator;
 use postgres_ffi::v17::waldecoder_handler::WalStreamDecoderHandler;
 use postgres_ffi::waldecoder::WalStreamDecoder;
+use postgres_versioninfo::PgMajorVersion;
 use pprof::criterion::{Output, PProfProfiler};
 use utils::lsn::Lsn;
 
@@ -32,7 +33,7 @@ fn bench_complete_record(c: &mut Criterion) {
         let value_size = LogicalMessageGenerator::make_value_size(size, PREFIX);
         let value = vec![1; value_size];
 
-        let mut decoder = WalStreamDecoder::new(Lsn(0), 170000);
+        let mut decoder = WalStreamDecoder::new(Lsn(0), PgMajorVersion::PG17);
         let msg = LogicalMessageGenerator::new(PREFIX, &value)
             .next()
             .unwrap()

libs/postgres_ffi/src/lib.rs

@@ -14,6 +14,8 @@ use bytes::Bytes;
 use utils::bin_ser::SerializeError;
 use utils::lsn::Lsn;
 
+pub use postgres_versioninfo::PgMajorVersion;
+
 macro_rules! postgres_ffi {
     ($version:ident) => {
         #[path = "."]
@@ -91,21 +93,22 @@ macro_rules! dispatch_pgversion {
             $version => $code,
             default = $invalid_pgver_handling,
             pgversions = [
-                14 : v14,
+                $crate::PgMajorVersion::PG14 => v14,
-                15 : v15,
+                $crate::PgMajorVersion::PG15 => v15,
-                16 : v16,
+                $crate::PgMajorVersion::PG16 => v16,
-                17 : v17,
+                $crate::PgMajorVersion::PG17 => v17,
             ]
         )
     };
     ($pgversion:expr => $code:expr,
      default = $default:expr,
-     pgversions = [$($sv:literal : $vsv:ident),+ $(,)?]) => {
+     pgversions = [$($sv:pat => $vsv:ident),+ $(,)?]) => {
-        match ($pgversion) {
+        match ($pgversion.clone().into()) {
             $($sv => {
                 use $crate::$vsv as pgv;
                 $code
             },)+
+            #[allow(unreachable_patterns)]
             _ => {
                 $default
             }
@@ -179,9 +182,9 @@ macro_rules! enum_pgversion {
             $($variant ( $crate::$md::$t )),+
         }
         impl self::$name {
-            pub fn pg_version(&self) -> u32 {
+            pub fn pg_version(&self) -> PgMajorVersion {
                 enum_pgversion_dispatch!(self, $name, _ign, {
-                    pgv::bindings::PG_MAJORVERSION_NUM
+                    pgv::bindings::MY_PGVERSION
                 })
             }
         }
@@ -195,15 +198,15 @@ macro_rules! enum_pgversion {
     };
     {name = $name:ident,
      path = $p:ident,
-     typ = $t:ident,
+     $(typ = $t:ident,)?
      pgversions = [$($variant:ident : $md:ident),+ $(,)?]} => {
         pub enum $name {
-            $($variant ($crate::$md::$p::$t)),+
+            $($variant $(($crate::$md::$p::$t))?),+
         }
         impl $name {
-            pub fn pg_version(&self) -> u32 {
+            pub fn pg_version(&self) -> PgMajorVersion {
                 enum_pgversion_dispatch!(self, $name, _ign, {
-                    pgv::bindings::PG_MAJORVERSION_NUM
+                    pgv::bindings::MY_PGVERSION
                 })
             }
         }
@@ -249,22 +252,21 @@ pub use v14::xlog_utils::{
     try_from_pg_timestamp,
 };
 
-pub fn bkpimage_is_compressed(bimg_info: u8, version: u32) -> bool {
+pub fn bkpimage_is_compressed(bimg_info: u8, version: PgMajorVersion) -> bool {
     dispatch_pgversion!(version, pgv::bindings::bkpimg_is_compressed(bimg_info))
 }
 
 pub fn generate_wal_segment(
     segno: u64,
     system_id: u64,
-    pg_version: u32,
+    pg_version: PgMajorVersion,
     lsn: Lsn,
 ) -> Result<Bytes, SerializeError> {
     assert_eq!(segno, lsn.segment_number(WAL_SEGMENT_SIZE));
 
     dispatch_pgversion!(
         pg_version,
-        pgv::xlog_utils::generate_wal_segment(segno, system_id, lsn),
+        pgv::xlog_utils::generate_wal_segment(segno, system_id, lsn)
-        Err(SerializeError::BadInput)
     )
 }
 
@@ -272,7 +274,7 @@ pub fn generate_pg_control(
     pg_control_bytes: &[u8],
     checkpoint_bytes: &[u8],
     lsn: Lsn,
-    pg_version: u32,
+    pg_version: PgMajorVersion,
 ) -> anyhow::Result<(Bytes, u64, bool)> {
     dispatch_pgversion!(
         pg_version,
@@ -352,6 +354,7 @@ pub fn fsm_logical_to_physical(addr: BlockNumber) -> BlockNumber {
 pub mod waldecoder {
     use std::num::NonZeroU32;
 
+    use crate::PgMajorVersion;
     use bytes::{Buf, Bytes, BytesMut};
     use thiserror::Error;
     use utils::lsn::Lsn;
@@ -369,7 +372,7 @@ pub mod waldecoder {
 
     pub struct WalStreamDecoder {
         pub lsn: Lsn,
-        pub pg_version: u32,
+        pub pg_version: PgMajorVersion,
         pub inputbuf: BytesMut,
         pub state: State,
     }
@@ -382,7 +385,7 @@ pub mod waldecoder {
     }
 
     impl WalStreamDecoder {
-        pub fn new(lsn: Lsn, pg_version: u32) -> WalStreamDecoder {
+        pub fn new(lsn: Lsn, pg_version: PgMajorVersion) -> WalStreamDecoder {
             WalStreamDecoder {
                 lsn,
                 pg_version,

libs/postgres_ffi/src/pg_constants_v14.rs

@@ -1,3 +1,7 @@
+use crate::PgMajorVersion;
+
+pub const MY_PGVERSION: PgMajorVersion = PgMajorVersion::PG14;
+
 pub const XLOG_DBASE_CREATE: u8 = 0x00;
 pub const XLOG_DBASE_DROP: u8 = 0x10;
 

libs/postgres_ffi/src/pg_constants_v15.rs

@@ -1,3 +1,7 @@
+use crate::PgMajorVersion;
+
+pub const MY_PGVERSION: PgMajorVersion = PgMajorVersion::PG15;
+
 pub const XACT_XINFO_HAS_DROPPED_STATS: u32 = 1u32 << 8;
 
 pub const XLOG_DBASE_CREATE_FILE_COPY: u8 = 0x00;

libs/postgres_ffi/src/pg_constants_v16.rs

@@ -1,3 +1,7 @@
+use crate::PgMajorVersion;
+
+pub const MY_PGVERSION: PgMajorVersion = PgMajorVersion::PG16;
+
 pub const XACT_XINFO_HAS_DROPPED_STATS: u32 = 1u32 << 8;
 
 pub const XLOG_DBASE_CREATE_FILE_COPY: u8 = 0x00;

libs/postgres_ffi/src/pg_constants_v17.rs

@@ -1,3 +1,7 @@
+use crate::PgMajorVersion;
+
+pub const MY_PGVERSION: PgMajorVersion = PgMajorVersion::PG17;
+
 pub const XACT_XINFO_HAS_DROPPED_STATS: u32 = 1u32 << 8;
 
 pub const XLOG_DBASE_CREATE_FILE_COPY: u8 = 0x00;

libs/postgres_ffi/src/walrecord.rs

@@ -9,8 +9,8 @@ use utils::bin_ser::DeserializeError;
 use utils::lsn::Lsn;
 
 use crate::{
-    BLCKSZ, BlockNumber, MultiXactId, MultiXactOffset, MultiXactStatus, Oid, RepOriginId,
+    BLCKSZ, BlockNumber, MultiXactId, MultiXactOffset, MultiXactStatus, Oid, PgMajorVersion,
-    TimestampTz, TransactionId, XLOG_SIZE_OF_XLOG_RECORD, XLogRecord, pg_constants,
+    RepOriginId, TimestampTz, TransactionId, XLOG_SIZE_OF_XLOG_RECORD, XLogRecord, pg_constants,
 };
 
 #[repr(C)]
@@ -199,20 +199,17 @@ impl DecodedWALRecord {
     /// Check if this WAL record represents a legacy "copy" database creation, which populates new relations
     /// by reading other existing relations' data blocks.  This is more complex to apply than new-style database
     /// creations which simply include all the desired blocks in the WAL, so we need a helper function to detect this case.
-    pub fn is_dbase_create_copy(&self, pg_version: u32) -> bool {
+    pub fn is_dbase_create_copy(&self, pg_version: PgMajorVersion) -> bool {
         if self.xl_rmid == pg_constants::RM_DBASE_ID {
             let info = self.xl_info & pg_constants::XLR_RMGR_INFO_MASK;
             match pg_version {
-                14 => {
+                PgMajorVersion::PG14 => {
                     // Postgres 14 database creations are always the legacy kind
                     info == crate::v14::bindings::XLOG_DBASE_CREATE
                 }
-                15 => info == crate::v15::bindings::XLOG_DBASE_CREATE_FILE_COPY,
+                PgMajorVersion::PG15 => info == crate::v15::bindings::XLOG_DBASE_CREATE_FILE_COPY,
-                16 => info == crate::v16::bindings::XLOG_DBASE_CREATE_FILE_COPY,
+                PgMajorVersion::PG16 => info == crate::v16::bindings::XLOG_DBASE_CREATE_FILE_COPY,
-                17 => info == crate::v17::bindings::XLOG_DBASE_CREATE_FILE_COPY,
+                PgMajorVersion::PG17 => info == crate::v17::bindings::XLOG_DBASE_CREATE_FILE_COPY,
-                _ => {
-                    panic!("Unsupported postgres version {pg_version}")
-                }
             }
         } else {
             false
@@ -248,7 +245,7 @@ impl DecodedWALRecord {
 pub fn decode_wal_record(
     record: Bytes,
     decoded: &mut DecodedWALRecord,
-    pg_version: u32,
+    pg_version: PgMajorVersion,
 ) -> anyhow::Result<()> {
     let mut rnode_spcnode: u32 = 0;
     let mut rnode_dbnode: u32 = 0;
@@ -1106,9 +1103,9 @@ pub struct XlClogTruncate {
 }
 
 impl XlClogTruncate {
-    pub fn decode(buf: &mut Bytes, pg_version: u32) -> XlClogTruncate {
+    pub fn decode(buf: &mut Bytes, pg_version: PgMajorVersion) -> XlClogTruncate {
         XlClogTruncate {
-            pageno: if pg_version < 17 {
+            pageno: if pg_version < PgMajorVersion::PG17 {
                 buf.get_u32_le()
             } else {
                 buf.get_u64_le() as u32

libs/postgres_ffi/src/xlog_utils.rs

@@ -11,9 +11,9 @@ use super::super::waldecoder::WalStreamDecoder;
 use super::bindings::{
     CheckPoint, ControlFileData, DBState_DB_SHUTDOWNED, FullTransactionId, TimeLineID, TimestampTz,
     XLogLongPageHeaderData, XLogPageHeaderData, XLogRecPtr, XLogRecord, XLogSegNo, XLOG_PAGE_MAGIC,
+    MY_PGVERSION
 };
 use super::wal_generator::LogicalMessageGenerator;
-use super::PG_MAJORVERSION;
 use crate::pg_constants;
 use crate::PG_TLI;
 use crate::{uint32, uint64, Oid};
@@ -233,7 +233,7 @@ pub fn find_end_of_wal(
     let mut result = start_lsn;
     let mut curr_lsn = start_lsn;
     let mut buf = [0u8; XLOG_BLCKSZ];
-    let pg_version = PG_MAJORVERSION[1..3].parse::<u32>().unwrap();
+    let pg_version = MY_PGVERSION;
     debug!("find_end_of_wal PG_VERSION: {}", pg_version);
 
     let mut decoder = WalStreamDecoder::new(start_lsn, pg_version);

libs/postgres_ffi/wal_craft/src/bin/wal_craft.rs

@@ -4,6 +4,7 @@ use std::str::FromStr;
 use anyhow::*;
 use clap::{Arg, ArgMatches, Command, value_parser};
 use postgres::Client;
+use postgres_ffi::PgMajorVersion;
 use wal_craft::*;
 
 fn main() -> Result<()> {
@@ -48,7 +49,7 @@ fn main() -> Result<()> {
         Some(("with-initdb", arg_matches)) => {
             let cfg = Conf {
                 pg_version: *arg_matches
-                    .get_one::<u32>("pg-version")
+                    .get_one::<PgMajorVersion>("pg-version")
                     .context("'pg-version' is required")?,
                 pg_distrib_dir: arg_matches
                     .get_one::<PathBuf>("pg-distrib-dir")

libs/postgres_ffi/wal_craft/src/lib.rs

@@ -9,8 +9,8 @@ use log::*;
 use postgres::Client;
 use postgres::types::PgLsn;
 use postgres_ffi::{
-    WAL_SEGMENT_SIZE, XLOG_BLCKSZ, XLOG_SIZE_OF_XLOG_LONG_PHD, XLOG_SIZE_OF_XLOG_RECORD,
+    PgMajorVersion, WAL_SEGMENT_SIZE, XLOG_BLCKSZ, XLOG_SIZE_OF_XLOG_LONG_PHD,
-    XLOG_SIZE_OF_XLOG_SHORT_PHD,
+    XLOG_SIZE_OF_XLOG_RECORD, XLOG_SIZE_OF_XLOG_SHORT_PHD,
 };
 
 macro_rules! xlog_utils_test {
@@ -29,7 +29,7 @@ macro_rules! xlog_utils_test {
 postgres_ffi::for_all_postgres_versions! { xlog_utils_test }
 
 pub struct Conf {
-    pub pg_version: u32,
+    pub pg_version: PgMajorVersion,
     pub pg_distrib_dir: PathBuf,
     pub datadir: PathBuf,
 }
@@ -52,11 +52,7 @@ impl Conf {
     pub fn pg_distrib_dir(&self) -> anyhow::Result<PathBuf> {
         let path = self.pg_distrib_dir.clone();
 
-        #[allow(clippy::manual_range_patterns)]
+        Ok(path.join(self.pg_version.v_str()))
-        match self.pg_version {
-            14 | 15 | 16 | 17 => Ok(path.join(format!("v{}", self.pg_version))),
-            _ => bail!("Unsupported postgres version: {}", self.pg_version),
-        }
     }
 
     fn pg_bin_dir(&self) -> anyhow::Result<PathBuf> {

libs/postgres_ffi/wal_craft/src/xlog_utils_test.rs

@@ -24,7 +24,7 @@ fn init_logging() {
 fn test_end_of_wal<C: crate::Crafter>(test_name: &str) {
     use crate::*;
 
-    let pg_version = PG_MAJORVERSION[1..3].parse::<u32>().unwrap();
+    let pg_version = MY_PGVERSION;
 
     // Craft some WAL
     let top_path = PathBuf::from(env!("CARGO_MANIFEST_DIR"))

libs/postgres_initdb/Cargo.toml

@@ -9,4 +9,5 @@ anyhow.workspace = true
 tokio.workspace = true
 camino.workspace = true
 thiserror.workspace = true
+postgres_versioninfo.workspace = true
 workspace_hack = { version = "0.1", path = "../../workspace_hack" }

libs/postgres_initdb/src/lib.rs

@@ -7,12 +7,13 @@
 use std::fmt;
 
 use camino::Utf8Path;
+use postgres_versioninfo::PgMajorVersion;
 
 pub struct RunInitdbArgs<'a> {
     pub superuser: &'a str,
     pub locale: &'a str,
     pub initdb_bin: &'a Utf8Path,
-    pub pg_version: u32,
+    pub pg_version: PgMajorVersion,
     pub library_search_path: &'a Utf8Path,
     pub pgdata: &'a Utf8Path,
 }
@@ -79,12 +80,16 @@ pub async fn do_run_initdb(args: RunInitdbArgs<'_>) -> Result<(), Error> {
         .stderr(std::process::Stdio::piped());
 
     // Before version 14, only the libc provide was available.
-    if pg_version > 14 {
+    if pg_version > PgMajorVersion::PG14 {
         // Version 17 brought with it a builtin locale provider which only provides
         // C and C.UTF-8. While being safer for collation purposes since it is
         // guaranteed to be consistent throughout a major release, it is also more
         // performant.
-        let locale_provider = if pg_version >= 17 { "builtin" } else { "libc" };
+        let locale_provider = if pg_version >= PgMajorVersion::PG17 {
+            "builtin"
+        } else {
+            "libc"
+        };
 
         initdb_command.args(["--locale-provider", locale_provider]);
     }

libs/postgres_versioninfo/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "postgres_versioninfo"
+version = "0.1.0"
+edition = "2024"
+license.workspace = true
+
+[dependencies]
+anyhow.workspace = true
+thiserror.workspace = true
+serde.workspace = true
+serde_repr.workspace = true
+workspace_hack = { version = "0.1", path = "../../workspace_hack" }

libs/postgres_versioninfo/src/lib.rs

@@ -0,0 +1,175 @@
+use serde::{Deserialize, Deserializer, Serialize, Serializer};
+use serde_repr::{Deserialize_repr, Serialize_repr};
+use std::fmt::{Display, Formatter};
+use std::str::FromStr;
+
+/// An enum with one variant for each major version of PostgreSQL that we support.
+///
+#[derive(Debug, Clone, Copy, Ord, PartialOrd, Eq, PartialEq, Deserialize_repr, Serialize_repr)]
+#[repr(u32)]
+pub enum PgMajorVersion {
+    PG14 = 14,
+    PG15 = 15,
+    PG16 = 16,
+    PG17 = 17,
+    // !!! When you add a new PgMajorVersion, don't forget to update PgMajorVersion::ALL
+}
+
+/// A full PostgreSQL version ID, in MMmmbb numerical format (Major/minor/bugfix)
+#[derive(Debug, Copy, Clone, Ord, PartialOrd, Eq, PartialEq)]
+#[repr(transparent)]
+pub struct PgVersionId(u32);
+
+impl PgVersionId {
+    pub const UNKNOWN: PgVersionId = PgVersionId(0);
+
+    pub fn from_full_pg_version(version: u32) -> PgVersionId {
+        match version {
+            0 => PgVersionId(version), // unknown version
+            140000..180000 => PgVersionId(version),
+            _ => panic!("Invalid full PostgreSQL version ID {version}"),
+        }
+    }
+}
+
+impl Display for PgVersionId {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        u32::fmt(&self.0, f)
+    }
+}
+
+impl Serialize for PgVersionId {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        u32::serialize(&self.0, serializer)
+    }
+}
+
+impl<'de> Deserialize<'de> for PgVersionId {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        u32::deserialize(deserializer).map(PgVersionId)
+    }
+
+    fn deserialize_in_place<D>(deserializer: D, place: &mut Self) -> Result<(), D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        u32::deserialize_in_place(deserializer, &mut place.0)
+    }
+}
+
+impl PgMajorVersion {
+    /// Get the numerical representation of the represented Major Version
+    pub const fn major_version_num(&self) -> u32 {
+        match self {
+            PgMajorVersion::PG14 => 14,
+            PgMajorVersion::PG15 => 15,
+            PgMajorVersion::PG16 => 16,
+            PgMajorVersion::PG17 => 17,
+        }
+    }
+
+    /// Get the contents of this version's PG_VERSION file.
+    ///
+    /// The PG_VERSION file is used to determine the PostgreSQL version that currently
+    /// owns the data in a PostgreSQL data directory.
+    pub fn versionfile_string(&self) -> &'static str {
+        match self {
+            PgMajorVersion::PG14 => "14",
+            PgMajorVersion::PG15 => "15",
+            PgMajorVersion::PG16 => "16\x0A",
+            PgMajorVersion::PG17 => "17\x0A",
+        }
+    }
+
+    /// Get the v{version} string of this major PostgreSQL version.
+    ///
+    /// Because this was hand-coded in various places, this was moved into a shared
+    /// implementation.
+    pub fn v_str(&self) -> String {
+        match self {
+            PgMajorVersion::PG14 => "v14",
+            PgMajorVersion::PG15 => "v15",
+            PgMajorVersion::PG16 => "v16",
+            PgMajorVersion::PG17 => "v17",
+        }
+        .to_string()
+    }
+
+    /// All currently supported major versions of PostgreSQL.
+    pub const ALL: &'static [PgMajorVersion] = &[
+        PgMajorVersion::PG14,
+        PgMajorVersion::PG15,
+        PgMajorVersion::PG16,
+        PgMajorVersion::PG17,
+    ];
+}
+
+impl Display for PgMajorVersion {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        f.write_str(match self {
+            PgMajorVersion::PG14 => "PgMajorVersion::PG14",
+            PgMajorVersion::PG15 => "PgMajorVersion::PG15",
+            PgMajorVersion::PG16 => "PgMajorVersion::PG16",
+            PgMajorVersion::PG17 => "PgMajorVersion::PG17",
+        })
+    }
+}
+
+#[derive(Debug, thiserror::Error)]
+#[allow(dead_code)]
+pub struct InvalidPgVersion(u32);
+
+impl Display for InvalidPgVersion {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        write!(f, "InvalidPgVersion({})", self.0)
+    }
+}
+
+impl TryFrom<PgVersionId> for PgMajorVersion {
+    type Error = InvalidPgVersion;
+
+    fn try_from(value: PgVersionId) -> Result<Self, Self::Error> {
+        Ok(match value.0 / 10000 {
+            14 => PgMajorVersion::PG14,
+            15 => PgMajorVersion::PG15,
+            16 => PgMajorVersion::PG16,
+            17 => PgMajorVersion::PG17,
+            _ => return Err(InvalidPgVersion(value.0)),
+        })
+    }
+}
+
+impl From<PgMajorVersion> for PgVersionId {
+    fn from(value: PgMajorVersion) -> Self {
+        PgVersionId((value as u32) * 10000)
+    }
+}
+
+#[derive(Debug, PartialEq, Eq, thiserror::Error)]
+pub struct PgMajorVersionParseError(String);
+
+impl Display for PgMajorVersionParseError {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        write!(f, "PgMajorVersionParseError({})", self.0)
+    }
+}
+
+impl FromStr for PgMajorVersion {
+    type Err = PgMajorVersionParseError;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        Ok(match s {
+            "14" => PgMajorVersion::PG14,
+            "15" => PgMajorVersion::PG15,
+            "16" => PgMajorVersion::PG16,
+            "17" => PgMajorVersion::PG17,
+            _ => return Err(PgMajorVersionParseError(s.to_string())),
+        })
+    }
+}

libs/safekeeper_api/Cargo.toml

@@ -10,6 +10,7 @@ const_format.workspace = true
 serde.workspace = true
 serde_json.workspace = true
 postgres_ffi.workspace = true
+postgres_versioninfo.workspace = true
 pq_proto.workspace = true
 tokio.workspace = true
 utils.workspace = true

libs/safekeeper_api/src/lib.rs

@@ -8,6 +8,8 @@ pub mod membership;
 /// Public API types
 pub mod models;
 
+pub use postgres_versioninfo::{PgMajorVersion, PgVersionId};
+
 /// Consensus logical timestamp. Note: it is a part of sk control file.
 pub type Term = u64;
 /// With this term timeline is created initially. It
@@ -20,7 +22,7 @@ pub const INITIAL_TERM: Term = 0;
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub struct ServerInfo {
     /// Postgres server version
-    pub pg_version: u32,
+    pub pg_version: PgVersionId,
     pub system_id: SystemId,
     pub wal_seg_size: u32,
 }

libs/safekeeper_api/src/models.rs

@@ -4,6 +4,7 @@ use std::net::SocketAddr;
 
 use pageserver_api::shard::ShardIdentity;
 use postgres_ffi::TimestampTz;
+use postgres_versioninfo::PgVersionId;
 use serde::{Deserialize, Serialize};
 use tokio::time::Instant;
 use utils::id::{NodeId, TenantId, TenantTimelineId, TimelineId};
@@ -23,8 +24,7 @@ pub struct TimelineCreateRequest {
     pub tenant_id: TenantId,
     pub timeline_id: TimelineId,
     pub mconf: Configuration,
-    /// In the PG_VERSION_NUM macro format, like 140017.
+    pub pg_version: PgVersionId,
-    pub pg_version: u32,
     pub system_id: Option<u64>,
     // By default WAL_SEGMENT_SIZE
     pub wal_seg_size: Option<u32>,

libs/wal_decoder/benches/bench_interpret_wal.rs

@@ -10,7 +10,7 @@ use futures::StreamExt;
 use futures::stream::FuturesUnordered;
 use pageserver_api::shard::{ShardIdentity, ShardStripeSize};
 use postgres_ffi::waldecoder::WalStreamDecoder;
-use postgres_ffi::{MAX_SEND_SIZE, WAL_SEGMENT_SIZE};
+use postgres_ffi::{MAX_SEND_SIZE, PgMajorVersion, WAL_SEGMENT_SIZE};
 use pprof::criterion::{Output, PProfProfiler};
 use remote_storage::{
     DownloadOpts, GenericRemoteStorage, ListingMode, RemoteStorageConfig, RemoteStorageKind,
@@ -115,7 +115,7 @@ struct BenchmarkData {
 
 #[derive(Deserialize)]
 struct BenchmarkMetadata {
-    pg_version: u32,
+    pg_version: PgMajorVersion,
     start_lsn: Lsn,
 }
 

libs/wal_decoder/src/decoder.rs

@@ -7,8 +7,8 @@ use bytes::{Buf, Bytes};
 use pageserver_api::key::rel_block_to_key;
 use pageserver_api::reltag::{RelTag, SlruKind};
 use pageserver_api::shard::ShardIdentity;
-use postgres_ffi::pg_constants;
 use postgres_ffi::walrecord::*;
+use postgres_ffi::{PgMajorVersion, pg_constants};
 use postgres_ffi_types::forknum::VISIBILITYMAP_FORKNUM;
 use utils::lsn::Lsn;
 
@@ -24,7 +24,7 @@ impl InterpretedWalRecord {
         buf: Bytes,
         shards: &[ShardIdentity],
         next_record_lsn: Lsn,
-        pg_version: u32,
+        pg_version: PgMajorVersion,
     ) -> anyhow::Result<HashMap<ShardIdentity, InterpretedWalRecord>> {
         let mut decoded = DecodedWALRecord::default();
         decode_wal_record(buf, &mut decoded, pg_version)?;
@@ -78,7 +78,7 @@ impl MetadataRecord {
         decoded: &DecodedWALRecord,
         shard_records: &mut HashMap<ShardIdentity, InterpretedWalRecord>,
         next_record_lsn: Lsn,
-        pg_version: u32,
+        pg_version: PgMajorVersion,
     ) -> anyhow::Result<()> {
         // Note: this doesn't actually copy the bytes since
         // the [`Bytes`] type implements it via a level of indirection.
@@ -193,7 +193,7 @@ impl MetadataRecord {
     fn decode_heapam_record(
         buf: &mut Bytes,
         decoded: &DecodedWALRecord,
-        pg_version: u32,
+        pg_version: PgMajorVersion,
     ) -> anyhow::Result<Option<MetadataRecord>> {
         // Handle VM bit updates that are implicitly part of heap records.
 
@@ -205,7 +205,7 @@ impl MetadataRecord {
         let mut flags = pg_constants::VISIBILITYMAP_VALID_BITS;
 
         match pg_version {
-            14 => {
+            PgMajorVersion::PG14 => {
                 if decoded.xl_rmid == pg_constants::RM_HEAP_ID {
                     let info = decoded.xl_info & pg_constants::XLOG_HEAP_OPMASK;
 
@@ -272,7 +272,7 @@ impl MetadataRecord {
                     anyhow::bail!("Unknown RMGR {} for Heap decoding", decoded.xl_rmid);
                 }
             }
-            15 => {
+            PgMajorVersion::PG15 => {
                 if decoded.xl_rmid == pg_constants::RM_HEAP_ID {
                     let info = decoded.xl_info & pg_constants::XLOG_HEAP_OPMASK;
 
@@ -339,7 +339,7 @@ impl MetadataRecord {
                     anyhow::bail!("Unknown RMGR {} for Heap decoding", decoded.xl_rmid);
                 }
             }
-            16 => {
+            PgMajorVersion::PG16 => {
                 if decoded.xl_rmid == pg_constants::RM_HEAP_ID {
                     let info = decoded.xl_info & pg_constants::XLOG_HEAP_OPMASK;
 
@@ -406,7 +406,7 @@ impl MetadataRecord {
                     anyhow::bail!("Unknown RMGR {} for Heap decoding", decoded.xl_rmid);
                 }
             }
-            17 => {
+            PgMajorVersion::PG17 => {
                 if decoded.xl_rmid == pg_constants::RM_HEAP_ID {
                     let info = decoded.xl_info & pg_constants::XLOG_HEAP_OPMASK;
 
@@ -473,7 +473,6 @@ impl MetadataRecord {
                     anyhow::bail!("Unknown RMGR {} for Heap decoding", decoded.xl_rmid);
                 }
             }
-            _ => {}
         }
 
         if new_heap_blkno.is_some() || old_heap_blkno.is_some() {
@@ -500,7 +499,7 @@ impl MetadataRecord {
     fn decode_neonmgr_record(
         buf: &mut Bytes,
         decoded: &DecodedWALRecord,
-        pg_version: u32,
+        pg_version: PgMajorVersion,
     ) -> anyhow::Result<Option<MetadataRecord>> {
         // Handle VM bit updates that are implicitly part of heap records.
 
@@ -514,7 +513,7 @@ impl MetadataRecord {
         assert_eq!(decoded.xl_rmid, pg_constants::RM_NEON_ID);
 
         match pg_version {
-            16 | 17 => {
+            PgMajorVersion::PG16 | PgMajorVersion::PG17 => {
                 let info = decoded.xl_info & pg_constants::XLOG_HEAP_OPMASK;
 
                 match info {
@@ -574,7 +573,7 @@ impl MetadataRecord {
                     info => anyhow::bail!("Unknown WAL record type for Neon RMGR: {}", info),
                 }
             }
-            _ => anyhow::bail!(
+            PgMajorVersion::PG15 | PgMajorVersion::PG14 => anyhow::bail!(
                 "Neon RMGR has no known compatibility with PostgreSQL version {}",
                 pg_version
             ),
@@ -629,14 +628,15 @@ impl MetadataRecord {
     fn decode_dbase_record(
         buf: &mut Bytes,
         decoded: &DecodedWALRecord,
-        pg_version: u32,
+        pg_version: PgMajorVersion,
     ) -> anyhow::Result<Option<MetadataRecord>> {
         // TODO: Refactor this to avoid the duplication between postgres versions.
 
         let info = decoded.xl_info & pg_constants::XLR_RMGR_INFO_MASK;
         tracing::debug!(%info, %pg_version, "handle RM_DBASE_ID");
 
-        if pg_version == 14 {
+        match pg_version {
+            PgMajorVersion::PG14 => {
                 if info == postgres_ffi::v14::bindings::XLOG_DBASE_CREATE {
                     let createdb = XlCreateDatabase::decode(buf);
                     tracing::debug!("XLOG_DBASE_CREATE v14");
@@ -659,7 +659,8 @@ impl MetadataRecord {
 
                     return Ok(Some(record));
                 }
-        } else if pg_version == 15 {
+            }
+            PgMajorVersion::PG15 => {
                 if info == postgres_ffi::v15::bindings::XLOG_DBASE_CREATE_WAL_LOG {
                     tracing::debug!("XLOG_DBASE_CREATE_WAL_LOG: noop");
                 } else if info == postgres_ffi::v15::bindings::XLOG_DBASE_CREATE_FILE_COPY {
@@ -686,7 +687,8 @@ impl MetadataRecord {
 
                     return Ok(Some(record));
                 }
-        } else if pg_version == 16 {
+            }
+            PgMajorVersion::PG16 => {
                 if info == postgres_ffi::v16::bindings::XLOG_DBASE_CREATE_WAL_LOG {
                     tracing::debug!("XLOG_DBASE_CREATE_WAL_LOG: noop");
                 } else if info == postgres_ffi::v16::bindings::XLOG_DBASE_CREATE_FILE_COPY {
@@ -713,7 +715,8 @@ impl MetadataRecord {
 
                     return Ok(Some(record));
                 }
-        } else if pg_version == 17 {
+            }
+            PgMajorVersion::PG17 => {
                 if info == postgres_ffi::v17::bindings::XLOG_DBASE_CREATE_WAL_LOG {
                     tracing::debug!("XLOG_DBASE_CREATE_WAL_LOG: noop");
                 } else if info == postgres_ffi::v17::bindings::XLOG_DBASE_CREATE_FILE_COPY {
@@ -741,6 +744,7 @@ impl MetadataRecord {
                     return Ok(Some(record));
                 }
             }
+        }
 
         Ok(None)
     }
@@ -748,12 +752,12 @@ impl MetadataRecord {
     fn decode_clog_record(
         buf: &mut Bytes,
         decoded: &DecodedWALRecord,
-        pg_version: u32,
+        pg_version: PgMajorVersion,
     ) -> anyhow::Result<Option<MetadataRecord>> {
         let info = decoded.xl_info & !pg_constants::XLR_INFO_MASK;
 
         if info == pg_constants::CLOG_ZEROPAGE {
-            let pageno = if pg_version < 17 {
+            let pageno = if pg_version < PgMajorVersion::PG17 {
                 buf.get_u32_le()
             } else {
                 buf.get_u64_le() as u32
@@ -765,7 +769,7 @@ impl MetadataRecord {
                 ClogZeroPage { segno, rpageno },
             ))))
         } else {
-            assert!(info == pg_constants::CLOG_TRUNCATE);
+            assert_eq!(info, pg_constants::CLOG_TRUNCATE);
             let xlrec = XlClogTruncate::decode(buf, pg_version);
 
             Ok(Some(MetadataRecord::Clog(ClogRecord::Truncate(
@@ -838,14 +842,14 @@ impl MetadataRecord {
     fn decode_multixact_record(
         buf: &mut Bytes,
         decoded: &DecodedWALRecord,
-        pg_version: u32,
+        pg_version: PgMajorVersion,
     ) -> anyhow::Result<Option<MetadataRecord>> {
         let info = decoded.xl_info & pg_constants::XLR_RMGR_INFO_MASK;
 
         if info == pg_constants::XLOG_MULTIXACT_ZERO_OFF_PAGE
             || info == pg_constants::XLOG_MULTIXACT_ZERO_MEM_PAGE
         {
-            let pageno = if pg_version < 17 {
+            let pageno = if pg_version < PgMajorVersion::PG17 {
                 buf.get_u32_le()
             } else {
                 buf.get_u64_le() as u32

libs/wal_decoder/src/serialized_batch.rs

@@ -13,7 +13,7 @@ use pageserver_api::keyspace::KeySpace;
 use pageserver_api::reltag::RelTag;
 use pageserver_api::shard::ShardIdentity;
 use postgres_ffi::walrecord::{DecodedBkpBlock, DecodedWALRecord};
-use postgres_ffi::{BLCKSZ, page_is_new, page_set_lsn, pg_constants};
+use postgres_ffi::{BLCKSZ, PgMajorVersion, page_is_new, page_set_lsn, pg_constants};
 use serde::{Deserialize, Serialize};
 use utils::bin_ser::BeSer;
 use utils::lsn::Lsn;
@@ -139,7 +139,7 @@ impl SerializedValueBatch {
         decoded: DecodedWALRecord,
         shard_records: &mut HashMap<ShardIdentity, InterpretedWalRecord>,
         next_record_lsn: Lsn,
-        pg_version: u32,
+        pg_version: PgMajorVersion,
     ) -> anyhow::Result<()> {
         // First determine how big the buffers need to be and allocate it up-front.
         // This duplicates some of the work below, but it's empirically much faster.
@@ -267,7 +267,7 @@ impl SerializedValueBatch {
     fn estimate_buffer_size(
         decoded: &DecodedWALRecord,
         shard: &ShardIdentity,
-        pg_version: u32,
+        pg_version: PgMajorVersion,
     ) -> usize {
         let mut estimate: usize = 0;
 
@@ -303,7 +303,11 @@ impl SerializedValueBatch {
         estimate
     }
 
-    fn block_is_image(decoded: &DecodedWALRecord, blk: &DecodedBkpBlock, pg_version: u32) -> bool {
+    fn block_is_image(
+        decoded: &DecodedWALRecord,
+        blk: &DecodedBkpBlock,
+        pg_version: PgMajorVersion,
+    ) -> bool {
         blk.apply_image
             && blk.has_image
             && decoded.xl_rmid == pg_constants::RM_XLOG_ID

pageserver/client/Cargo.toml

@@ -18,6 +18,7 @@ workspace_hack = { version = "0.1", path = "../../workspace_hack" }
 tokio-postgres.workspace = true
 tokio-stream.workspace = true
 tokio.workspace = true
+postgres_versioninfo.workspace = true
 futures.workspace = true
 tokio-util.workspace = true
 anyhow.workspace = true

pageserver/client/src/mgmt_api.rs

@@ -7,6 +7,7 @@ use detach_ancestor::AncestorDetached;
 use http_utils::error::HttpErrorBody;
 use pageserver_api::models::*;
 use pageserver_api::shard::TenantShardId;
+use postgres_versioninfo::PgMajorVersion;
 pub use reqwest::Body as ReqwestBody;
 use reqwest::{IntoUrl, Method, StatusCode, Url};
 use utils::id::{TenantId, TimelineId};
@@ -745,9 +746,11 @@ impl Client {
         timeline_id: TimelineId,
         base_lsn: Lsn,
         end_lsn: Lsn,
-        pg_version: u32,
+        pg_version: PgMajorVersion,
         basebackup_tarball: ReqwestBody,
     ) -> Result<()> {
+        let pg_version = pg_version.major_version_num();
+
         let uri = format!(
             "{}/v1/tenant/{tenant_id}/timeline/{timeline_id}/import_basebackup?base_lsn={base_lsn}&end_lsn={end_lsn}&pg_version={pg_version}",
             self.mgmt_api_endpoint,

pageserver/src/basebackup.rs

@@ -20,7 +20,8 @@ use pageserver_api::key::{Key, rel_block_to_key};
 use pageserver_api::reltag::{RelTag, SlruKind};
 use postgres_ffi::pg_constants::{PG_HBA, PGDATA_SPECIAL_FILES};
 use postgres_ffi::{
-    BLCKSZ, PG_TLI, RELSEG_SIZE, WAL_SEGMENT_SIZE, XLogFileName, dispatch_pgversion, pg_constants,
+    BLCKSZ, PG_TLI, PgMajorVersion, RELSEG_SIZE, WAL_SEGMENT_SIZE, XLogFileName,
+    dispatch_pgversion, pg_constants,
 };
 use postgres_ffi_types::constants::{DEFAULTTABLESPACE_OID, GLOBALTABLESPACE_OID};
 use postgres_ffi_types::forknum::{INIT_FORKNUM, MAIN_FORKNUM};
@@ -619,10 +620,7 @@ where
         };
 
         if spcnode == GLOBALTABLESPACE_OID {
-            let pg_version_str = match self.timeline.pg_version {
+            let pg_version_str = self.timeline.pg_version.versionfile_string();
-                14 | 15 => self.timeline.pg_version.to_string(),
-                ver => format!("{ver}\x0A"),
-            };
             let header = new_tar_header("PG_VERSION", pg_version_str.len() as u64)?;
             self.ar
                 .append(&header, pg_version_str.as_bytes())
@@ -679,10 +677,7 @@ where
             if let Some(img) = relmap_img {
                 let dst_path = format!("base/{dbnode}/PG_VERSION");
 
-                let pg_version_str = match self.timeline.pg_version {
+                let pg_version_str = self.timeline.pg_version.versionfile_string();
-                    14 | 15 => self.timeline.pg_version.to_string(),
-                    ver => format!("{ver}\x0A"),
-                };
                 let header = new_tar_header(&dst_path, pg_version_str.len() as u64)?;
                 self.ar
                     .append(&header, pg_version_str.as_bytes())
@@ -713,7 +708,7 @@ where
         buf.extend_from_slice(&img[..]);
         let crc = crc32c::crc32c(&img[..]);
         buf.put_u32_le(crc);
-        let path = if self.timeline.pg_version < 17 {
+        let path = if self.timeline.pg_version < PgMajorVersion::PG17 {
             format!("pg_twophase/{xid:>08X}")
         } else {
             format!("pg_twophase/{xid:>016X}")

pageserver/src/config.rs

@@ -11,7 +11,7 @@ use std::num::NonZeroUsize;
 use std::sync::Arc;
 use std::time::Duration;
 
-use anyhow::{Context, bail, ensure};
+use anyhow::{Context, ensure};
 use camino::{Utf8Path, Utf8PathBuf};
 use once_cell::sync::OnceCell;
 use pageserver_api::config::{
@@ -22,6 +22,7 @@ use pageserver_api::models::ImageCompressionAlgorithm;
 use pageserver_api::shard::TenantShardId;
 use pem::Pem;
 use postgres_backend::AuthType;
+use postgres_ffi::PgMajorVersion;
 use remote_storage::{RemotePath, RemoteStorageConfig};
 use reqwest::Url;
 use storage_broker::Uri;
@@ -338,20 +339,16 @@ impl PageServerConf {
     //
     // Postgres distribution paths
     //
-    pub fn pg_distrib_dir(&self, pg_version: u32) -> anyhow::Result<Utf8PathBuf> {
+    pub fn pg_distrib_dir(&self, pg_version: PgMajorVersion) -> anyhow::Result<Utf8PathBuf> {
         let path = self.pg_distrib_dir.clone();
 
-        #[allow(clippy::manual_range_patterns)]
+        Ok(path.join(pg_version.v_str()))
-        match pg_version {
-            14 | 15 | 16 | 17 => Ok(path.join(format!("v{pg_version}"))),
-            _ => bail!("Unsupported postgres version: {}", pg_version),
-        }
     }
 
-    pub fn pg_bin_dir(&self, pg_version: u32) -> anyhow::Result<Utf8PathBuf> {
+    pub fn pg_bin_dir(&self, pg_version: PgMajorVersion) -> anyhow::Result<Utf8PathBuf> {
         Ok(self.pg_distrib_dir(pg_version)?.join("bin"))
     }
-    pub fn pg_lib_dir(&self, pg_version: u32) -> anyhow::Result<Utf8PathBuf> {
+    pub fn pg_lib_dir(&self, pg_version: PgMajorVersion) -> anyhow::Result<Utf8PathBuf> {
         Ok(self.pg_distrib_dir(pg_version)?.join("lib"))
     }
 

pageserver/src/http/routes.rs

@@ -41,6 +41,7 @@ use pageserver_api::models::{
     TopTenantShardItem, TopTenantShardsRequest, TopTenantShardsResponse,
 };
 use pageserver_api::shard::{ShardCount, TenantShardId};
+use postgres_ffi::PgMajorVersion;
 use remote_storage::{DownloadError, GenericRemoteStorage, TimeTravelError};
 use scopeguard::defer;
 use serde_json::json;
@@ -3385,7 +3386,7 @@ async fn put_tenant_timeline_import_basebackup(
     let timeline_id: TimelineId = parse_request_param(&request, "timeline_id")?;
     let base_lsn: Lsn = must_parse_query_param(&request, "base_lsn")?;
     let end_lsn: Lsn = must_parse_query_param(&request, "end_lsn")?;
-    let pg_version: u32 = must_parse_query_param(&request, "pg_version")?;
+    let pg_version: PgMajorVersion = must_parse_query_param(&request, "pg_version")?;
 
     check_permission(&request, Some(tenant_id))?;
 

pageserver/src/lib.rs

@@ -38,6 +38,7 @@ pub mod walredo;
 
 use camino::Utf8Path;
 use deletion_queue::DeletionQueue;
+use postgres_ffi::PgMajorVersion;
 use tenant::mgr::{BackgroundPurges, TenantManager};
 use tenant::secondary;
 use tracing::{info, info_span};
@@ -51,7 +52,7 @@ use tracing::{info, info_span};
 /// backwards-compatible changes to the metadata format.
 pub const STORAGE_FORMAT_VERSION: u16 = 3;
 
-pub const DEFAULT_PG_VERSION: u32 = 17;
+pub const DEFAULT_PG_VERSION: PgMajorVersion = PgMajorVersion::PG17;
 
 // Magic constants used to identify different kinds of files
 pub const IMAGE_FILE_MAGIC: u16 = 0x5A60;

pageserver/src/pgdatadir_mapping.rs

@@ -25,7 +25,7 @@ use pageserver_api::keyspace::{KeySpaceRandomAccum, SparseKeySpace};
 use pageserver_api::models::RelSizeMigration;
 use pageserver_api::reltag::{BlockNumber, RelTag, SlruKind};
 use pageserver_api::shard::ShardIdentity;
-use postgres_ffi::{BLCKSZ, TimestampTz, TransactionId};
+use postgres_ffi::{BLCKSZ, PgMajorVersion, TimestampTz, TransactionId};
 use postgres_ffi_types::forknum::{FSM_FORKNUM, VISIBILITYMAP_FORKNUM};
 use postgres_ffi_types::{Oid, RepOriginId};
 use serde::{Deserialize, Serialize};
@@ -1081,7 +1081,7 @@ impl Timeline {
         // fetch directory entry
         let buf = self.get(TWOPHASEDIR_KEY, lsn, ctx).await?;
 
-        if self.pg_version >= 17 {
+        if self.pg_version >= PgMajorVersion::PG17 {
             Ok(TwoPhaseDirectoryV17::des(&buf)?.xids)
         } else {
             Ok(TwoPhaseDirectory::des(&buf)?
@@ -1613,7 +1613,7 @@ impl DatadirModification<'_> {
             .push((DirectoryKind::Db, MetricsUpdate::Set(0)));
         self.put(DBDIR_KEY, Value::Image(buf.into()));
 
-        let buf = if self.tline.pg_version >= 17 {
+        let buf = if self.tline.pg_version >= PgMajorVersion::PG17 {
             TwoPhaseDirectoryV17::ser(&TwoPhaseDirectoryV17 {
                 xids: HashSet::new(),
             })
@@ -1967,7 +1967,7 @@ impl DatadirModification<'_> {
     ) -> Result<(), WalIngestError> {
         // Add it to the directory entry
         let dirbuf = self.get(TWOPHASEDIR_KEY, ctx).await?;
-        let newdirbuf = if self.tline.pg_version >= 17 {
+        let newdirbuf = if self.tline.pg_version >= PgMajorVersion::PG17 {
             let mut dir = TwoPhaseDirectoryV17::des(&dirbuf)?;
             if !dir.xids.insert(xid) {
                 Err(WalIngestErrorKind::FileAlreadyExists(xid))?;
@@ -2383,7 +2383,7 @@ impl DatadirModification<'_> {
     ) -> Result<(), WalIngestError> {
         // Remove it from the directory entry
         let buf = self.get(TWOPHASEDIR_KEY, ctx).await?;
-        let newdirbuf = if self.tline.pg_version >= 17 {
+        let newdirbuf = if self.tline.pg_version >= PgMajorVersion::PG17 {
             let mut dir = TwoPhaseDirectoryV17::des(&buf)?;
 
             if !dir.xids.remove(&xid) {

pageserver/src/tenant.rs

@@ -38,6 +38,7 @@ use pageserver_api::models::{
     WalRedoManagerStatus,
 };
 use pageserver_api::shard::{ShardIdentity, ShardStripeSize, TenantShardId};
+use postgres_ffi::PgMajorVersion;
 use remote_storage::{DownloadError, GenericRemoteStorage, TimeoutOrCancel};
 use remote_timeline_client::index::GcCompactionState;
 use remote_timeline_client::manifest::{
@@ -497,7 +498,7 @@ impl WalRedoManager {
         lsn: Lsn,
         base_img: Option<(Lsn, bytes::Bytes)>,
         records: Vec<(Lsn, wal_decoder::models::record::NeonWalRecord)>,
-        pg_version: u32,
+        pg_version: PgMajorVersion,
         redo_attempt_type: RedoAttemptType,
     ) -> Result<bytes::Bytes, walredo::Error> {
         match self {
@@ -933,7 +934,7 @@ pub(crate) enum CreateTimelineParams {
 pub(crate) struct CreateTimelineParamsBootstrap {
     pub(crate) new_timeline_id: TimelineId,
     pub(crate) existing_initdb_timeline_id: Option<TimelineId>,
-    pub(crate) pg_version: u32,
+    pub(crate) pg_version: PgMajorVersion,
 }
 
 /// NB: See comment on [`CreateTimelineIdempotency::Branch`] for why there's no `pg_version` here.
@@ -971,7 +972,7 @@ pub(crate) enum CreateTimelineIdempotency {
     /// NB: special treatment, see comment in [`Self`].
     FailWithConflict,
     Bootstrap {
-        pg_version: u32,
+        pg_version: PgMajorVersion,
     },
     /// NB: branches always have the same `pg_version` as their ancestor.
     /// While [`pageserver_api::models::TimelineCreateRequestMode::Branch::pg_version`]
@@ -2541,7 +2542,7 @@ impl TenantShard {
         self: &Arc<Self>,
         new_timeline_id: TimelineId,
         initdb_lsn: Lsn,
-        pg_version: u32,
+        pg_version: PgMajorVersion,
         ctx: &RequestContext,
     ) -> anyhow::Result<(UninitializedTimeline, RequestContext)> {
         anyhow::ensure!(
@@ -2593,7 +2594,7 @@ impl TenantShard {
         self: &Arc<Self>,
         new_timeline_id: TimelineId,
         initdb_lsn: Lsn,
-        pg_version: u32,
+        pg_version: PgMajorVersion,
         ctx: &RequestContext,
     ) -> anyhow::Result<Arc<Timeline>> {
         let (uninit_tl, ctx) = self
@@ -2632,7 +2633,7 @@ impl TenantShard {
         self: &Arc<Self>,
         new_timeline_id: TimelineId,
         initdb_lsn: Lsn,
-        pg_version: u32,
+        pg_version: PgMajorVersion,
         ctx: &RequestContext,
         in_memory_layer_desc: Vec<timeline::InMemoryLayerTestDesc>,
         delta_layer_desc: Vec<timeline::DeltaLayerTestDesc>,
@@ -2898,7 +2899,7 @@ impl TenantShard {
                     Lsn(0),
                     initdb_lsn,
                     initdb_lsn,
-                    15,
+                    PgMajorVersion::PG15,
                 );
                 this.prepare_new_timeline(
                     new_timeline_id,
@@ -5090,7 +5091,7 @@ impl TenantShard {
     pub(crate) async fn bootstrap_timeline_test(
         self: &Arc<Self>,
         timeline_id: TimelineId,
-        pg_version: u32,
+        pg_version: PgMajorVersion,
         load_existing_initdb: Option<TimelineId>,
         ctx: &RequestContext,
     ) -> anyhow::Result<Arc<Timeline>> {
@@ -5232,7 +5233,7 @@ impl TenantShard {
     async fn bootstrap_timeline(
         self: &Arc<Self>,
         timeline_id: TimelineId,
-        pg_version: u32,
+        pg_version: PgMajorVersion,
         load_existing_initdb: Option<TimelineId>,
         ctx: &RequestContext,
     ) -> Result<CreateTimelineResult, CreateTimelineError> {
@@ -5770,7 +5771,7 @@ impl TenantShard {
 async fn run_initdb(
     conf: &'static PageServerConf,
     initdb_target_dir: &Utf8Path,
-    pg_version: u32,
+    pg_version: PgMajorVersion,
     cancel: &CancellationToken,
 ) -> Result<(), InitdbError> {
     let initdb_bin_path = conf
@@ -6051,7 +6052,7 @@ pub(crate) mod harness {
             lsn: Lsn,
             base_img: Option<(Lsn, Bytes)>,
             records: Vec<(Lsn, NeonWalRecord)>,
-            _pg_version: u32,
+            _pg_version: PgMajorVersion,
             _redo_attempt_type: RedoAttemptType,
         ) -> Result<Bytes, walredo::Error> {
             let records_neon = records.iter().all(|r| apply_neon::can_apply_in_neon(&r.1));
@@ -6223,7 +6224,7 @@ mod tests {
     async fn randomize_timeline(
         tenant: &Arc<TenantShard>,
         new_timeline_id: TimelineId,
-        pg_version: u32,
+        pg_version: PgMajorVersion,
         spec: TestTimelineSpecification,
         random: &mut rand::rngs::StdRng,
         ctx: &RequestContext,

pageserver/src/tenant/metadata.rs

@@ -18,6 +18,7 @@
 //! [`IndexPart`]: super::remote_timeline_client::index::IndexPart
 
 use anyhow::ensure;
+use postgres_ffi::PgMajorVersion;
 use serde::{Deserialize, Serialize};
 use utils::bin_ser::{BeSer, SerializeError};
 use utils::id::TimelineId;
@@ -136,7 +137,7 @@ struct TimelineMetadataBodyV2 {
     latest_gc_cutoff_lsn: Lsn,
 
     initdb_lsn: Lsn,
-    pg_version: u32,
+    pg_version: PgMajorVersion,
 }
 
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
@@ -167,7 +168,7 @@ impl TimelineMetadata {
         ancestor_lsn: Lsn,
         latest_gc_cutoff_lsn: Lsn,
         initdb_lsn: Lsn,
-        pg_version: u32,
+        pg_version: PgMajorVersion,
     ) -> Self {
         Self {
             hdr: TimelineMetadataHeader {
@@ -215,7 +216,7 @@ impl TimelineMetadata {
             ancestor_lsn: body.ancestor_lsn,
             latest_gc_cutoff_lsn: body.latest_gc_cutoff_lsn,
             initdb_lsn: body.initdb_lsn,
-            pg_version: 14, // All timelines created before this version had pg_version 14
+            pg_version: PgMajorVersion::PG14, // All timelines created before this version had pg_version 14
         };
 
         hdr.format_version = METADATA_FORMAT_VERSION;
@@ -317,7 +318,7 @@ impl TimelineMetadata {
         self.body.initdb_lsn
     }
 
-    pub fn pg_version(&self) -> u32 {
+    pub fn pg_version(&self) -> PgMajorVersion {
         self.body.pg_version
     }
 
@@ -331,7 +332,7 @@ impl TimelineMetadata {
             Lsn::from_hex("00000000").unwrap(),
             Lsn::from_hex("00000000").unwrap(),
             Lsn::from_hex("00000000").unwrap(),
-            0,
+            PgMajorVersion::PG14,
         );
         let bytes = instance.to_bytes().unwrap();
         Self::from_bytes(&bytes).unwrap()
@@ -545,7 +546,7 @@ mod tests {
             Lsn(0),
             Lsn(0),
             Lsn(0),
-            14, // All timelines created before this version had pg_version 14
+            PgMajorVersion::PG14, // All timelines created before this version had pg_version 14
         );
 
         assert_eq!(
@@ -565,7 +566,7 @@ mod tests {
             Lsn(0),
             // Updating this version to 17 will cause the test to fail at the
             // next assert_eq!().
-            16,
+            PgMajorVersion::PG16,
         );
         let expected_bytes = vec![
             /* TimelineMetadataHeader */

pageserver/src/tenant/remote_timeline_client/index.rs

@@ -427,8 +427,8 @@ impl GcBlocking {
 
 #[cfg(test)]
 mod tests {
+    use postgres_ffi::PgMajorVersion;
     use std::str::FromStr;
-
     use utils::id::TimelineId;
 
     use super::*;
@@ -831,7 +831,7 @@ mod tests {
                 Lsn::INVALID,
                 Lsn::from_str("0/1696070").unwrap(),
                 Lsn::from_str("0/1696070").unwrap(),
-                14,
+                PgMajorVersion::PG14,
             ).with_recalculated_checksum().unwrap(),
             deleted_at: Some(parse_naive_datetime("2023-07-31T09:00:00.123000000")),
             archived_at: None,
@@ -893,7 +893,7 @@ mod tests {
                 Lsn::INVALID,
                 Lsn::from_str("0/1696070").unwrap(),
                 Lsn::from_str("0/1696070").unwrap(),
-                14,
+                PgMajorVersion::PG14,
             ).with_recalculated_checksum().unwrap(),
             deleted_at: Some(parse_naive_datetime("2023-07-31T09:00:00.123000000")),
             archived_at: Some(parse_naive_datetime("2023-04-29T09:00:00.123000000")),
@@ -957,7 +957,7 @@ mod tests {
                 Lsn::INVALID,
                 Lsn::from_str("0/1696070").unwrap(),
                 Lsn::from_str("0/1696070").unwrap(),
-                14,
+                PgMajorVersion::PG14,
             ).with_recalculated_checksum().unwrap(),
             deleted_at: None,
             lineage: Default::default(),
@@ -1033,7 +1033,7 @@ mod tests {
                 Lsn::INVALID,
                 Lsn::from_str("0/1696070").unwrap(),
                 Lsn::from_str("0/1696070").unwrap(),
-                14,
+                PgMajorVersion::PG14,
             ).with_recalculated_checksum().unwrap(),
             deleted_at: None,
             lineage: Default::default(),
@@ -1114,7 +1114,7 @@ mod tests {
                 Lsn::INVALID,
                 Lsn::from_str("0/1696070").unwrap(),
                 Lsn::from_str("0/1696070").unwrap(),
-                14,
+                PgMajorVersion::PG14,
             ).with_recalculated_checksum().unwrap(),
             deleted_at: None,
             lineage: Default::default(),
@@ -1199,7 +1199,7 @@ mod tests {
                 Lsn::INVALID,
                 Lsn::from_str("0/1696070").unwrap(),
                 Lsn::from_str("0/1696070").unwrap(),
-                14,
+                PgMajorVersion::PG14,
             ).with_recalculated_checksum().unwrap(),
             deleted_at: None,
             lineage: Default::default(),
@@ -1287,7 +1287,7 @@ mod tests {
                 Lsn::INVALID,
                 Lsn::from_str("0/1696070").unwrap(),
                 Lsn::from_str("0/1696070").unwrap(),
-                14,
+                PgMajorVersion::PG14,
             ).with_recalculated_checksum().unwrap(),
             deleted_at: None,
             lineage: Default::default(),

pageserver/src/tenant/storage_layer/delta_layer.rs

@@ -1622,11 +1622,6 @@ impl DeltaLayerIterator<'_> {
 pub(crate) mod test {
     use std::collections::BTreeMap;
 
-    use bytes::Bytes;
-    use itertools::MinMaxResult;
-    use rand::prelude::{SeedableRng, SliceRandom, StdRng};
-    use rand::{Rng, RngCore};
-
     use super::*;
     use crate::DEFAULT_PG_VERSION;
     use crate::context::DownloadBehavior;
@@ -1636,6 +1631,11 @@ pub(crate) mod test {
     use crate::tenant::storage_layer::{Layer, ResidentLayer};
     use crate::tenant::timeline::layer_manager::LayerManagerLockHolder;
     use crate::tenant::{TenantShard, Timeline};
+    use bytes::Bytes;
+    use itertools::MinMaxResult;
+    use postgres_ffi::PgMajorVersion;
+    use rand::prelude::{SeedableRng, SliceRandom, StdRng};
+    use rand::{Rng, RngCore};
 
     /// Construct an index for a fictional delta layer and and then
     /// traverse in order to plan vectored reads for a query. Finally,
@@ -1995,7 +1995,7 @@ pub(crate) mod test {
         let (tenant, ctx) = h.load().await;
         let ctx = &ctx;
         let timeline = tenant
-            .create_test_timeline(TimelineId::generate(), Lsn(0x10), 14, ctx)
+            .create_test_timeline(TimelineId::generate(), Lsn(0x10), PgMajorVersion::PG14, ctx)
             .await
             .unwrap();
         let ctx = &ctx.with_scope_timeline(&timeline);

pageserver/src/tenant/storage_layer/layer/tests.rs

@@ -1,6 +1,7 @@
 use std::time::UNIX_EPOCH;
 
 use pageserver_api::key::{CONTROLFILE_KEY, Key};
+use postgres_ffi::PgMajorVersion;
 use tokio::task::JoinSet;
 use utils::completion::{self, Completion};
 use utils::id::TimelineId;
@@ -45,7 +46,7 @@ async fn smoke_test() {
         .create_test_timeline_with_layers(
             TimelineId::generate(),
             Lsn(0x10),
-            14,
+            PgMajorVersion::PG14,
             &ctx,
             Default::default(), // in-memory layers
             Default::default(),
@@ -256,7 +257,12 @@ async fn evict_and_wait_on_wanted_deleted() {
     let (tenant, ctx) = h.load().await;
 
     let timeline = tenant
-        .create_test_timeline(TimelineId::generate(), Lsn(0x10), 14, &ctx)
+        .create_test_timeline(
+            TimelineId::generate(),
+            Lsn(0x10),
+            PgMajorVersion::PG14,
+            &ctx,
+        )
         .await
         .unwrap();
 
@@ -341,7 +347,12 @@ fn read_wins_pending_eviction() {
         let download_span = span.in_scope(|| tracing::info_span!("downloading", timeline_id = 1));
 
         let timeline = tenant
-            .create_test_timeline(TimelineId::generate(), Lsn(0x10), 14, &ctx)
+            .create_test_timeline(
+                TimelineId::generate(),
+                Lsn(0x10),
+                PgMajorVersion::PG14,
+                &ctx,
+            )
             .await
             .unwrap();
         let ctx = ctx.with_scope_timeline(&timeline);
@@ -474,7 +485,12 @@ fn multiple_pending_evictions_scenario(name: &'static str, in_order: bool) {
         let download_span = span.in_scope(|| tracing::info_span!("downloading", timeline_id = 1));
 
         let timeline = tenant
-            .create_test_timeline(TimelineId::generate(), Lsn(0x10), 14, &ctx)
+            .create_test_timeline(
+                TimelineId::generate(),
+                Lsn(0x10),
+                PgMajorVersion::PG14,
+                &ctx,
+            )
             .await
             .unwrap();
         let ctx = ctx.with_scope_timeline(&timeline);
@@ -644,7 +660,12 @@ async fn cancelled_get_or_maybe_download_does_not_cancel_eviction() {
     let (tenant, ctx) = h.load().await;
 
     let timeline = tenant
-        .create_test_timeline(TimelineId::generate(), Lsn(0x10), 14, &ctx)
+        .create_test_timeline(
+            TimelineId::generate(),
+            Lsn(0x10),
+            PgMajorVersion::PG14,
+            &ctx,
+        )
         .await
         .unwrap();
     let ctx = ctx.with_scope_timeline(&timeline);
@@ -730,7 +751,12 @@ async fn evict_and_wait_does_not_wait_for_download() {
     let download_span = span.in_scope(|| tracing::info_span!("downloading", timeline_id = 1));
 
     let timeline = tenant
-        .create_test_timeline(TimelineId::generate(), Lsn(0x10), 14, &ctx)
+        .create_test_timeline(
+            TimelineId::generate(),
+            Lsn(0x10),
+            PgMajorVersion::PG14,
+            &ctx,
+        )
         .await
         .unwrap();
     let ctx = ctx.with_scope_timeline(&timeline);
@@ -836,7 +862,12 @@ async fn eviction_cancellation_on_drop() {
     let (tenant, ctx) = h.load().await;
 
     let timeline = tenant
-        .create_test_timeline(TimelineId::generate(), Lsn(0x10), 14, &ctx)
+        .create_test_timeline(
+            TimelineId::generate(),
+            Lsn(0x10),
+            PgMajorVersion::PG14,
+            &ctx,
+        )
         .await
         .unwrap();
 

pageserver/src/tenant/timeline.rs

@@ -58,7 +58,7 @@ use pageserver_api::reltag::{BlockNumber, RelTag};
 use pageserver_api::shard::{ShardIdentity, ShardIndex, ShardNumber, TenantShardId};
 use postgres_connection::PgConnectionConfig;
 use postgres_ffi::v14::xlog_utils;
-use postgres_ffi::{WAL_SEGMENT_SIZE, to_pg_timestamp};
+use postgres_ffi::{PgMajorVersion, WAL_SEGMENT_SIZE, to_pg_timestamp};
 use rand::Rng;
 use remote_storage::DownloadError;
 use serde_with::serde_as;
@@ -225,7 +225,7 @@ pub struct Timeline {
     /// to shards, and is constant through the lifetime of this Timeline.
     shard_identity: ShardIdentity,
 
-    pub pg_version: u32,
+    pub pg_version: PgMajorVersion,
 
     /// The tuple has two elements.
     /// 1. `LayerFileManager` keeps track of the various physical representations of the layer files (inmem, local, remote).
@@ -2913,7 +2913,7 @@ impl Timeline {
         shard_identity: ShardIdentity,
         walredo_mgr: Option<Arc<super::WalRedoManager>>,
         resources: TimelineResources,
-        pg_version: u32,
+        pg_version: PgMajorVersion,
         state: TimelineState,
         attach_wal_lag_cooldown: Arc<OnceLock<WalLagCooldown>>,
         create_idempotency: crate::tenant::CreateTimelineIdempotency,
@@ -7593,6 +7593,7 @@ mod tests {
     use std::sync::Arc;
 
     use pageserver_api::key::Key;
+    use postgres_ffi::PgMajorVersion;
     use std::iter::Iterator;
     use tracing::Instrument;
     use utils::id::TimelineId;
@@ -7667,7 +7668,7 @@ mod tests {
             .create_test_timeline_with_layers(
                 TimelineId::generate(),
                 Lsn(0x10),
-                14,
+                PgMajorVersion::PG14,
                 &ctx,
                 Vec::new(), // in-memory layers
                 delta_layers,
@@ -7803,7 +7804,7 @@ mod tests {
             .create_test_timeline_with_layers(
                 TimelineId::generate(),
                 Lsn(0x10),
-                14,
+                PgMajorVersion::PG14,
                 &ctx,
                 Vec::new(), // in-memory layers
                 delta_layers,
@@ -7863,7 +7864,12 @@ mod tests {
 
         let (tenant, ctx) = harness.load().await;
         let timeline = tenant
-            .create_test_timeline(TimelineId::generate(), Lsn(0x10), 14, &ctx)
+            .create_test_timeline(
+                TimelineId::generate(),
+                Lsn(0x10),
+                PgMajorVersion::PG14,
+                &ctx,
+            )
             .await
             .unwrap();
 

pageserver/src/tenant/timeline/import_pgdata/importbucket_client.rs

@@ -3,7 +3,7 @@ use std::sync::Arc;
 
 use anyhow::Context;
 use bytes::Bytes;
-use postgres_ffi::ControlFileData;
+use postgres_ffi::{ControlFileData, PgMajorVersion};
 use remote_storage::{
     Download, DownloadError, DownloadKind, DownloadOpts, GenericRemoteStorage, Listing,
     ListingObject, RemotePath, RemoteStorageConfig,
@@ -264,7 +264,7 @@ impl ControlFile {
     pub(crate) fn base_lsn(&self) -> Lsn {
         Lsn(self.control_file_data.checkPoint).align()
     }
-    pub(crate) fn pg_version(&self) -> u32 {
+    pub(crate) fn pg_version(&self) -> PgMajorVersion {
         self.try_pg_version()
             .expect("prepare() checks that try_pg_version doesn't error")
     }
@@ -274,13 +274,14 @@ impl ControlFile {
     pub(crate) fn control_file_buf(&self) -> &Bytes {
         &self.control_file_buf
     }
-    fn try_pg_version(&self) -> anyhow::Result<u32> {
+
+    fn try_pg_version(&self) -> anyhow::Result<PgMajorVersion> {
         Ok(match self.control_file_data.catalog_version_no {
             // thesea are from catversion.h
-            202107181 => 14,
+            202107181 => PgMajorVersion::PG14,
-            202209061 => 15,
+            202209061 => PgMajorVersion::PG15,
-            202307071 => 16,
+            202307071 => PgMajorVersion::PG16,
-            202406281 => 17,
+            202406281 => PgMajorVersion::PG17,
             catversion => {
                 anyhow::bail!("unrecognized catalog version {catversion}")
             }

pageserver/src/walingest.rs

@@ -32,8 +32,8 @@ use pageserver_api::reltag::{BlockNumber, RelTag, SlruKind};
 use pageserver_api::shard::ShardIdentity;
 use postgres_ffi::walrecord::*;
 use postgres_ffi::{
-    TimestampTz, TransactionId, dispatch_pgversion, enum_pgversion, enum_pgversion_dispatch,
+    PgMajorVersion, TimestampTz, TransactionId, dispatch_pgversion, enum_pgversion,
-    fsm_logical_to_physical, pg_constants,
+    enum_pgversion_dispatch, fsm_logical_to_physical, pg_constants,
 };
 use postgres_ffi_types::forknum::{FSM_FORKNUM, INIT_FORKNUM, MAIN_FORKNUM, VISIBILITYMAP_FORKNUM};
 use tracing::*;
@@ -781,7 +781,7 @@ impl WalIngest {
     ) -> Result<(), WalIngestError> {
         let (xact_common, is_commit, is_prepared) = match record {
             XactRecord::Prepare(XactPrepare { xl_xid, data }) => {
-                let xid: u64 = if modification.tline.pg_version >= 17 {
+                let xid: u64 = if modification.tline.pg_version >= PgMajorVersion::PG17 {
                     self.adjust_to_full_transaction_id(xl_xid)?
                 } else {
                     xl_xid as u64
@@ -886,7 +886,7 @@ impl WalIngest {
                 xl_xid, parsed.xid, lsn,
             );
 
-            let xid: u64 = if modification.tline.pg_version >= 17 {
+            let xid: u64 = if modification.tline.pg_version >= PgMajorVersion::PG17 {
                 self.adjust_to_full_transaction_id(parsed.xid)?
             } else {
                 parsed.xid as u64
@@ -1241,7 +1241,7 @@ impl WalIngest {
                 if xlog_checkpoint.oldestActiveXid == pg_constants::INVALID_TRANSACTION_ID
                     && info == pg_constants::XLOG_CHECKPOINT_SHUTDOWN
                 {
-                    let oldest_active_xid = if pg_version >= 17 {
+                    let oldest_active_xid = if pg_version >= PgMajorVersion::PG17 {
                         let mut oldest_active_full_xid = cp.nextXid.value;
                         for xid in modification.tline.list_twophase_files(lsn, ctx).await? {
                             if xid < oldest_active_full_xid {
@@ -1475,10 +1475,11 @@ impl WalIngest {
 
                     const fn rate_limiter(
                         &self,
-                        pg_version: u32,
+                        pg_version: PgMajorVersion,
                     ) -> Option<&Lazy<Mutex<RateLimit>>> {
-                        const MIN_PG_VERSION: u32 = 14;
+                        const MIN_PG_VERSION: u32 = PgMajorVersion::PG14.major_version_num();
-                        const MAX_PG_VERSION: u32 = 17;
+                        const MAX_PG_VERSION: u32 = PgMajorVersion::PG17.major_version_num();
+                        let pg_version = pg_version.major_version_num();
 
                         if pg_version < MIN_PG_VERSION || pg_version > MAX_PG_VERSION {
                             return None;
@@ -1603,6 +1604,7 @@ async fn get_relsize(
 #[cfg(test)]
 mod tests {
     use anyhow::Result;
+    use postgres_ffi::PgMajorVersion;
     use postgres_ffi::RELSEG_SIZE;
 
     use super::*;
@@ -1625,7 +1627,7 @@ mod tests {
 
     #[tokio::test]
     async fn test_zeroed_checkpoint_decodes_correctly() -> Result<(), anyhow::Error> {
-        for i in 14..=16 {
+        for i in PgMajorVersion::ALL {
             dispatch_pgversion!(i, {
                 pgv::CheckPoint::decode(&pgv::ZERO_CHECKPOINT)?;
             });
@@ -2335,7 +2337,7 @@ mod tests {
         // 5. Grep sk logs for "restart decoder" to get startpoint
         // 6. Run just the decoder from this test to get the endpoint.
         //    It's the last LSN the decoder will output.
-        let pg_version = 15; // The test data was generated by pg15
+        let pg_version = PgMajorVersion::PG15; // The test data was generated by pg15
         let path = "test_data/sk_wal_segment_from_pgbench";
         let wal_segment_path = format!("{path}/000000010000000000000001.zst");
         let source_initdb_path = format!("{path}/{INITDB_PATH}");

pageserver/src/walredo.rs

@@ -33,6 +33,7 @@ use bytes::{Bytes, BytesMut};
 use pageserver_api::key::Key;
 use pageserver_api::models::{WalRedoManagerProcessStatus, WalRedoManagerStatus};
 use pageserver_api::shard::TenantShardId;
+use postgres_ffi::PgMajorVersion;
 use tracing::*;
 use utils::lsn::Lsn;
 use utils::sync::gate::GateError;
@@ -165,7 +166,7 @@ impl PostgresRedoManager {
         lsn: Lsn,
         base_img: Option<(Lsn, Bytes)>,
         records: Vec<(Lsn, NeonWalRecord)>,
-        pg_version: u32,
+        pg_version: PgMajorVersion,
         redo_attempt_type: RedoAttemptType,
     ) -> Result<Bytes, Error> {
         if records.is_empty() {
@@ -232,7 +233,7 @@ impl PostgresRedoManager {
     /// # Cancel-Safety
     ///
     /// This method is cancellation-safe.
-    pub async fn ping(&self, pg_version: u32) -> Result<(), Error> {
+    pub async fn ping(&self, pg_version: PgMajorVersion) -> Result<(), Error> {
         self.do_with_walredo_process(pg_version, |proc| async move {
             proc.ping(Duration::from_secs(1))
                 .await
@@ -342,7 +343,7 @@ impl PostgresRedoManager {
         O,
     >(
         &self,
-        pg_version: u32,
+        pg_version: PgMajorVersion,
         closure: F,
     ) -> Result<O, Error> {
         let proc: Arc<Process> = match self.redo_process.get_or_init_detached().await {
@@ -442,7 +443,7 @@ impl PostgresRedoManager {
         base_img_lsn: Lsn,
         records: &[(Lsn, NeonWalRecord)],
         wal_redo_timeout: Duration,
-        pg_version: u32,
+        pg_version: PgMajorVersion,
         max_retry_attempts: u32,
     ) -> Result<Bytes, Error> {
         *(self.last_redo_at.lock().unwrap()) = Some(Instant::now());
@@ -572,6 +573,7 @@ mod tests {
     use bytes::Bytes;
     use pageserver_api::key::Key;
     use pageserver_api::shard::TenantShardId;
+    use postgres_ffi::PgMajorVersion;
     use tracing::Instrument;
     use utils::id::TenantId;
     use utils::lsn::Lsn;
@@ -586,7 +588,7 @@ mod tests {
         let h = RedoHarness::new().unwrap();
 
         h.manager
-            .ping(14)
+            .ping(PgMajorVersion::PG14)
             .instrument(h.span())
             .await
             .expect("ping should work");
@@ -612,7 +614,7 @@ mod tests {
                 Lsn::from_str("0/16E2408").unwrap(),
                 None,
                 short_records(),
-                14,
+                PgMajorVersion::PG14,
                 RedoAttemptType::ReadPage,
             )
             .instrument(h.span())
@@ -641,7 +643,7 @@ mod tests {
                 Lsn::from_str("0/16E2408").unwrap(),
                 None,
                 short_records(),
-                14,
+                PgMajorVersion::PG14,
                 RedoAttemptType::ReadPage,
             )
             .instrument(h.span())
@@ -663,7 +665,7 @@ mod tests {
                 Lsn::INVALID,
                 None,
                 short_records(),
-                16, /* 16 currently produces stderr output on startup, which adds a nice extra edge */
+                PgMajorVersion::PG16, /* 16 currently produces stderr output on startup, which adds a nice extra edge */
                 RedoAttemptType::ReadPage,
             )
             .instrument(h.span())

pageserver/src/walredo/process.rs

@@ -12,7 +12,7 @@ use anyhow::Context;
 use bytes::Bytes;
 use pageserver_api::reltag::RelTag;
 use pageserver_api::shard::TenantShardId;
-use postgres_ffi::BLCKSZ;
+use postgres_ffi::{BLCKSZ, PgMajorVersion};
 use tokio::io::{AsyncReadExt, AsyncWriteExt};
 use tracing::{Instrument, debug, error, instrument};
 use utils::lsn::Lsn;
@@ -54,11 +54,11 @@ impl WalRedoProcess {
     //
     // Start postgres binary in special WAL redo mode.
     //
-    #[instrument(skip_all,fields(pg_version=pg_version))]
+    #[instrument(skip_all,fields(pg_version=pg_version.major_version_num()))]
     pub(crate) fn launch(
         conf: &'static PageServerConf,
         tenant_shard_id: TenantShardId,
-        pg_version: u32,
+        pg_version: PgMajorVersion,
     ) -> anyhow::Result<Self> {
         crate::span::debug_assert_current_span_has_tenant_id();
 

safekeeper/Cargo.toml

@@ -58,6 +58,7 @@ metrics.workspace = true
 pem.workspace = true
 postgres_backend.workspace = true
 postgres_ffi.workspace = true
+postgres_versioninfo.workspace = true
 pq_proto.workspace = true
 remote_storage.workspace = true
 safekeeper_api.workspace = true

safekeeper/src/control_file_upgrade.rs

@@ -2,6 +2,7 @@
 use std::vec;
 
 use anyhow::{Result, bail};
+use postgres_versioninfo::PgVersionId;
 use pq_proto::SystemId;
 use safekeeper_api::membership::{Configuration, INVALID_GENERATION};
 use safekeeper_api::{ServerInfo, Term};
@@ -46,7 +47,7 @@ struct SafeKeeperStateV1 {
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub struct ServerInfoV2 {
     /// Postgres server version
-    pub pg_version: u32,
+    pub pg_version: PgVersionId,
     pub system_id: SystemId,
     pub tenant_id: TenantId,
     pub timeline_id: TimelineId,
@@ -75,7 +76,7 @@ pub struct SafeKeeperStateV2 {
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub struct ServerInfoV3 {
     /// Postgres server version
-    pub pg_version: u32,
+    pub pg_version: PgVersionId,
     pub system_id: SystemId,
     #[serde(with = "hex")]
     pub tenant_id: TenantId,
@@ -444,13 +445,13 @@ pub fn upgrade_control_file(buf: &[u8], version: u32) -> Result<TimelinePersiste
     } else if version == 6 {
         info!("reading safekeeper control file version {}", version);
         let mut oldstate = TimelinePersistentState::des(&buf[..buf.len()])?;
-        if oldstate.server.pg_version != 0 {
+        if oldstate.server.pg_version != PgVersionId::UNKNOWN {
             return Ok(oldstate);
         }
 
         // set pg_version to the default v14
         info!("setting pg_version to 140005");
-        oldstate.server.pg_version = 140005;
+        oldstate.server.pg_version = PgVersionId::from_full_pg_version(140005);
 
         return Ok(oldstate);
     } else if version == 7 {
@@ -547,6 +548,7 @@ pub fn downgrade_v10_to_v9(state: &TimelinePersistentState) -> TimelinePersisten
 mod tests {
     use std::str::FromStr;
 
+    use postgres_versioninfo::PgMajorVersion;
     use utils::Hex;
     use utils::id::NodeId;
 
@@ -563,7 +565,7 @@ mod tests {
                 epoch: 43,
             },
             server: ServerInfoV2 {
-                pg_version: 14,
+                pg_version: PgVersionId::from(PgMajorVersion::PG14),
                 system_id: 0x1234567887654321,
                 tenant_id,
                 timeline_id,
@@ -586,8 +588,8 @@ mod tests {
             0x2a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
             // epoch
             0x2b, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-            // pg_version
+            // pg_version = 140000
-            0x0e, 0x00, 0x00, 0x00,
+            0xE0, 0x22, 0x02, 0x00,
             // system_id
             0x21, 0x43, 0x65, 0x87, 0x78, 0x56, 0x34, 0x12,
             // tenant_id
@@ -626,7 +628,7 @@ mod tests {
                 }]),
             },
             server: ServerInfoV2 {
-                pg_version: 14,
+                pg_version: PgVersionId::from(PgMajorVersion::PG14),
                 system_id: 0x1234567887654321,
                 tenant_id,
                 timeline_id,
@@ -646,7 +648,7 @@ mod tests {
         let expected = [
             0x2a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
             0x00, 0x00, 0x29, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
-            0x00, 0x00, 0x00, 0x00, 0x0e, 0x00, 0x00, 0x00, 0x21, 0x43, 0x65, 0x87, 0x78, 0x56,
+            0x00, 0x00, 0x00, 0x00, 0xE0, 0x22, 0x02, 0x00, 0x21, 0x43, 0x65, 0x87, 0x78, 0x56,
             0x34, 0x12, 0xcf, 0x04, 0x80, 0x92, 0x97, 0x07, 0xee, 0x75, 0x37, 0x23, 0x37, 0xef,
             0xaa, 0x5e, 0xcf, 0x96, 0x11, 0x2d, 0xed, 0x66, 0x42, 0x2a, 0xa5, 0xe9, 0x53, 0xe5,
             0x44, 0x0f, 0xa5, 0x42, 0x7a, 0xc4, 0x78, 0x56, 0x34, 0x12, 0xc4, 0x7a, 0x42, 0xa5,
@@ -675,7 +677,7 @@ mod tests {
                 }]),
             },
             server: ServerInfoV3 {
-                pg_version: 14,
+                pg_version: PgVersionId::from(PgMajorVersion::PG14),
                 system_id: 0x1234567887654321,
                 tenant_id,
                 timeline_id,
@@ -695,7 +697,7 @@ mod tests {
         let expected = [
             0x2a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
             0x00, 0x00, 0x29, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
-            0x00, 0x00, 0x00, 0x00, 0x0e, 0x00, 0x00, 0x00, 0x21, 0x43, 0x65, 0x87, 0x78, 0x56,
+            0x00, 0x00, 0x00, 0x00, 0xE0, 0x22, 0x02, 0x00, 0x21, 0x43, 0x65, 0x87, 0x78, 0x56,
             0x34, 0x12, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x63, 0x66, 0x30, 0x34,
             0x38, 0x30, 0x39, 0x32, 0x39, 0x37, 0x30, 0x37, 0x65, 0x65, 0x37, 0x35, 0x33, 0x37,
             0x32, 0x33, 0x33, 0x37, 0x65, 0x66, 0x61, 0x61, 0x35, 0x65, 0x63, 0x66, 0x39, 0x36,
@@ -731,7 +733,7 @@ mod tests {
                 }]),
             },
             server: ServerInfo {
-                pg_version: 14,
+                pg_version: PgVersionId::from(PgMajorVersion::PG14),
                 system_id: 0x1234567887654321,
                 wal_seg_size: 0x12345678,
             },
@@ -765,7 +767,7 @@ mod tests {
             0x30, 0x66, 0x61, 0x35, 0x34, 0x32, 0x37, 0x61, 0x63, 0x34, 0x2a, 0x00, 0x00, 0x00,
             0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x29, 0x00,
             0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-            0x0e, 0x00, 0x00, 0x00, 0x21, 0x43, 0x65, 0x87, 0x78, 0x56, 0x34, 0x12, 0x78, 0x56,
+            0xE0, 0x22, 0x02, 0x00, 0x21, 0x43, 0x65, 0x87, 0x78, 0x56, 0x34, 0x12, 0x78, 0x56,
             0x34, 0x12, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x63, 0x34, 0x37, 0x61,
             0x34, 0x32, 0x61, 0x35, 0x30, 0x66, 0x34, 0x34, 0x65, 0x35, 0x35, 0x33, 0x65, 0x39,
             0x61, 0x35, 0x32, 0x61, 0x34, 0x32, 0x36, 0x36, 0x65, 0x64, 0x32, 0x64, 0x31, 0x31,

safekeeper/src/safekeeper.rs

@@ -9,6 +9,7 @@ use anyhow::{Context, Result, bail};
 use byteorder::{LittleEndian, ReadBytesExt};
 use bytes::{Buf, BufMut, Bytes, BytesMut};
 use postgres_ffi::{MAX_SEND_SIZE, TimeLineID};
+use postgres_versioninfo::{PgMajorVersion, PgVersionId};
 use pq_proto::SystemId;
 use safekeeper_api::membership::{
     INVALID_GENERATION, MemberSet, SafekeeperGeneration as Generation, SafekeeperId,
@@ -29,7 +30,7 @@ use crate::{control_file, wal_storage};
 
 pub const SK_PROTO_VERSION_2: u32 = 2;
 pub const SK_PROTO_VERSION_3: u32 = 3;
-pub const UNKNOWN_SERVER_VERSION: u32 = 0;
+pub const UNKNOWN_SERVER_VERSION: PgVersionId = PgVersionId::UNKNOWN;
 
 #[derive(Debug, Clone, Copy, Serialize, Deserialize, PartialEq, Eq, PartialOrd, Ord)]
 pub struct TermLsn {
@@ -218,7 +219,7 @@ pub struct ProposerGreeting {
     pub timeline_id: TimelineId,
     pub mconf: membership::Configuration,
     /// Postgres server version
-    pub pg_version: u32,
+    pub pg_version: PgVersionId,
     pub system_id: SystemId,
     pub wal_seg_size: u32,
 }
@@ -229,7 +230,7 @@ pub struct ProposerGreetingV2 {
     /// proposer-acceptor protocol version
     pub protocol_version: u32,
     /// Postgres server version
-    pub pg_version: u32,
+    pub pg_version: PgVersionId,
     pub proposer_id: PgUuid,
     pub system_id: SystemId,
     pub timeline_id: TimelineId,
@@ -511,7 +512,7 @@ impl ProposerAcceptorMessage {
                         tenant_id,
                         timeline_id,
                         mconf,
-                        pg_version,
+                        pg_version: PgVersionId::from_full_pg_version(pg_version),
                         system_id,
                         wal_seg_size,
                     };
@@ -961,7 +962,8 @@ where
          * because safekeepers parse WAL headers and the format
          * may change between versions.
          */
-        if msg.pg_version / 10000 != self.state.server.pg_version / 10000
+        if PgMajorVersion::try_from(msg.pg_version)?
+            != PgMajorVersion::try_from(self.state.server.pg_version)?
             && self.state.server.pg_version != UNKNOWN_SERVER_VERSION
         {
             bail!(
@@ -1748,7 +1750,7 @@ mod tests {
                 }]),
             },
             server: ServerInfo {
-                pg_version: 14,
+                pg_version: PgVersionId::from_full_pg_version(140000),
                 system_id: 0x1234567887654321,
                 wal_seg_size: 0x12345678,
             },

safekeeper/src/send_interpreted_wal.rs

@@ -8,8 +8,8 @@ use futures::StreamExt;
 use futures::future::Either;
 use pageserver_api::shard::ShardIdentity;
 use postgres_backend::{CopyStreamHandlerEnd, PostgresBackend};
-use postgres_ffi::get_current_timestamp;
 use postgres_ffi::waldecoder::{WalDecodeError, WalStreamDecoder};
+use postgres_ffi::{PgMajorVersion, get_current_timestamp};
 use pq_proto::{BeMessage, InterpretedWalRecordsBody, WalSndKeepAlive};
 use tokio::io::{AsyncRead, AsyncWrite};
 use tokio::sync::mpsc::error::SendError;
@@ -78,7 +78,7 @@ pub(crate) struct InterpretedWalReader {
     shard_senders: HashMap<ShardIdentity, smallvec::SmallVec<[ShardSenderState; 1]>>,
     shard_notification_rx: Option<tokio::sync::mpsc::UnboundedReceiver<AttachShardNotification>>,
     state: Arc<std::sync::RwLock<InterpretedWalReaderState>>,
-    pg_version: u32,
+    pg_version: PgMajorVersion,
 }
 
 /// A handle for [`InterpretedWalReader`] which allows for interacting with it
@@ -258,7 +258,7 @@ impl InterpretedWalReader {
         start_pos: Lsn,
         tx: tokio::sync::mpsc::Sender<Batch>,
         shard: ShardIdentity,
-        pg_version: u32,
+        pg_version: PgMajorVersion,
         appname: &Option<String>,
     ) -> InterpretedWalReaderHandle {
         let state = Arc::new(std::sync::RwLock::new(InterpretedWalReaderState::Running {
@@ -322,7 +322,7 @@ impl InterpretedWalReader {
         start_pos: Lsn,
         tx: tokio::sync::mpsc::Sender<Batch>,
         shard: ShardIdentity,
-        pg_version: u32,
+        pg_version: PgMajorVersion,
         shard_notification_rx: Option<
             tokio::sync::mpsc::UnboundedReceiver<AttachShardNotification>,
         >,
@@ -718,7 +718,7 @@ mod tests {
     use std::time::Duration;
 
     use pageserver_api::shard::{ShardIdentity, ShardStripeSize};
-    use postgres_ffi::MAX_SEND_SIZE;
+    use postgres_ffi::{MAX_SEND_SIZE, PgMajorVersion};
     use tokio::sync::mpsc::error::TryRecvError;
     use utils::id::{NodeId, TenantTimelineId};
     use utils::lsn::Lsn;
@@ -734,7 +734,7 @@ mod tests {
 
         const SIZE: usize = 8 * 1024;
         const MSG_COUNT: usize = 200;
-        const PG_VERSION: u32 = 17;
+        const PG_VERSION: PgMajorVersion = PgMajorVersion::PG17;
         const SHARD_COUNT: u8 = 2;
 
         let start_lsn = Lsn::from_str("0/149FD18").unwrap();
@@ -876,7 +876,7 @@ mod tests {
 
         const SIZE: usize = 8 * 1024;
         const MSG_COUNT: usize = 200;
-        const PG_VERSION: u32 = 17;
+        const PG_VERSION: PgMajorVersion = PgMajorVersion::PG17;
         const SHARD_COUNT: u8 = 2;
 
         let start_lsn = Lsn::from_str("0/149FD18").unwrap();
@@ -1025,7 +1025,7 @@ mod tests {
 
         const SIZE: usize = 64 * 1024;
         const MSG_COUNT: usize = 10;
-        const PG_VERSION: u32 = 17;
+        const PG_VERSION: PgMajorVersion = PgMajorVersion::PG17;
         const SHARD_COUNT: u8 = 2;
         const WAL_READER_BATCH_SIZE: usize = 8192;
 
@@ -1148,7 +1148,7 @@ mod tests {
 
         const SIZE: usize = 8 * 1024;
         const MSG_COUNT: usize = 10;
-        const PG_VERSION: u32 = 17;
+        const PG_VERSION: PgMajorVersion = PgMajorVersion::PG17;
 
         let start_lsn = Lsn::from_str("0/149FD18").unwrap();
         let env = Env::new(true).unwrap();

safekeeper/src/send_wal.rs

@@ -12,7 +12,7 @@ use futures::FutureExt;
 use itertools::Itertools;
 use parking_lot::Mutex;
 use postgres_backend::{CopyStreamHandlerEnd, PostgresBackend, PostgresBackendReader, QueryError};
-use postgres_ffi::{MAX_SEND_SIZE, TimestampTz, get_current_timestamp};
+use postgres_ffi::{MAX_SEND_SIZE, PgMajorVersion, TimestampTz, get_current_timestamp};
 use pq_proto::{BeMessage, WalSndKeepAlive, XLogDataBody};
 use safekeeper_api::Term;
 use safekeeper_api::models::{
@@ -559,7 +559,9 @@ impl SafekeeperPostgresHandler {
                 format,
                 compression,
             } => {
-                let pg_version = tli.tli.get_state().await.1.server.pg_version / 10000;
+                let pg_version =
+                    PgMajorVersion::try_from(tli.tli.get_state().await.1.server.pg_version)
+                        .unwrap();
                 let end_watch_view = end_watch.view();
                 let wal_residence_guard = tli.wal_residence_guard().await?;
                 let (tx, rx) = tokio::sync::mpsc::channel::<Batch>(2);

safekeeper/src/state.rs

@@ -7,6 +7,7 @@ use std::time::SystemTime;
 
 use anyhow::{Result, bail};
 use postgres_ffi::WAL_SEGMENT_SIZE;
+use postgres_versioninfo::{PgMajorVersion, PgVersionId};
 use safekeeper_api::membership::Configuration;
 use safekeeper_api::models::{TimelineMembershipSwitchResponse, TimelineTermBumpResponse};
 use safekeeper_api::{INITIAL_TERM, ServerInfo, Term};
@@ -149,7 +150,7 @@ impl TimelinePersistentState {
             &TenantTimelineId::empty(),
             Configuration::empty(),
             ServerInfo {
-                pg_version: 170000, /* Postgres server version (major * 10000) */
+                pg_version: PgVersionId::from(PgMajorVersion::PG17),
                 system_id: 0, /* Postgres system identifier */
                 wal_seg_size: WAL_SEGMENT_SIZE as u32,
             },

safekeeper/src/wal_storage.rs

@@ -19,6 +19,7 @@ use futures::future::BoxFuture;
 use postgres_ffi::v14::xlog_utils::{IsPartialXLogFileName, IsXLogFileName, XLogFromFileName};
 use postgres_ffi::waldecoder::WalStreamDecoder;
 use postgres_ffi::{PG_TLI, XLogFileName, XLogSegNo, dispatch_pgversion};
+use postgres_versioninfo::{PgMajorVersion, PgVersionId};
 use pq_proto::SystemId;
 use remote_storage::RemotePath;
 use std::sync::Arc;
@@ -92,7 +93,7 @@ pub struct PhysicalStorage {
 
     /// Size of WAL segment in bytes.
     wal_seg_size: usize,
-    pg_version: u32,
+    pg_version: PgVersionId,
     system_id: u64,
 
     /// Written to disk, but possibly still in the cache and not fully persisted.
@@ -180,7 +181,7 @@ impl PhysicalStorage {
         let write_lsn = if state.commit_lsn == Lsn(0) {
             Lsn(0)
         } else {
-            let version = state.server.pg_version / 10000;
+            let version = PgMajorVersion::try_from(state.server.pg_version).unwrap();
 
             dispatch_pgversion!(
                 version,
@@ -226,7 +227,10 @@ impl PhysicalStorage {
             write_record_lsn: write_lsn,
             flush_lsn,
             flush_record_lsn: flush_lsn,
-            decoder: WalStreamDecoder::new(write_lsn, state.server.pg_version / 10000),
+            decoder: WalStreamDecoder::new(
+                write_lsn,
+                PgMajorVersion::try_from(state.server.pg_version).unwrap(),
+            ),
             file: None,
             pending_wal_truncation: true,
         })
@@ -408,7 +412,7 @@ impl Storage for PhysicalStorage {
 
         let segno = init_lsn.segment_number(self.wal_seg_size);
         let (mut file, _) = self.open_or_create(segno).await?;
-        let major_pg_version = self.pg_version / 10000;
+        let major_pg_version = PgMajorVersion::try_from(self.pg_version).unwrap();
         let wal_seg =
             postgres_ffi::generate_wal_segment(segno, self.system_id, major_pg_version, init_lsn)?;
         file.seek(SeekFrom::Start(0)).await?;
@@ -654,7 +658,7 @@ pub struct WalReader {
     // pos is in the same segment as timeline_start_lsn.
     timeline_start_lsn: Lsn,
     // integer version number of PostgreSQL, e.g. 14; 15; 16
-    pg_version: u32,
+    pg_version: PgMajorVersion,
     system_id: SystemId,
     timeline_start_segment: Option<Bytes>,
 }
@@ -697,7 +701,7 @@ impl WalReader {
             wal_backup,
             local_start_lsn: state.local_start_lsn,
             timeline_start_lsn: state.timeline_start_lsn,
-            pg_version: state.server.pg_version / 10000,
+            pg_version: PgMajorVersion::try_from(state.server.pg_version).unwrap(),
             system_id: state.server.system_id,
             timeline_start_segment: None,
         })

safekeeper/tests/walproposer_sim/safekeeper_disk.rs

@@ -7,8 +7,8 @@ use anyhow::Result;
 use bytes::{Buf, BytesMut};
 use futures::future::BoxFuture;
 use parking_lot::Mutex;
-use postgres_ffi::XLogSegNo;
 use postgres_ffi::waldecoder::WalStreamDecoder;
+use postgres_ffi::{PgMajorVersion, XLogSegNo};
 use safekeeper::metrics::WalStorageMetrics;
 use safekeeper::state::TimelinePersistentState;
 use safekeeper::{control_file, wal_storage};
@@ -142,7 +142,7 @@ impl DiskWALStorage {
             write_lsn,
             write_record_lsn: flush_lsn,
             flush_record_lsn: flush_lsn,
-            decoder: WalStreamDecoder::new(flush_lsn, 16),
+            decoder: WalStreamDecoder::new(flush_lsn, PgMajorVersion::PG16),
             unflushed_bytes: BytesMut::new(),
             disk,
         })
@@ -151,7 +151,7 @@ impl DiskWALStorage {
     fn find_end_of_wal(disk: Arc<TimelineDisk>, start_lsn: Lsn) -> Result<Lsn> {
         let mut buf = [0; 8192];
         let mut pos = start_lsn.0;
-        let mut decoder = WalStreamDecoder::new(start_lsn, 16);
+        let mut decoder = WalStreamDecoder::new(start_lsn, PgMajorVersion::PG16);
         let mut result = start_lsn;
         loop {
             disk.wal.lock().read(pos, &mut buf);
@@ -204,7 +204,7 @@ impl wal_storage::Storage for DiskWALStorage {
                 self.decoder.available(),
                 startpos,
             );
-            self.decoder = WalStreamDecoder::new(startpos, 16);
+            self.decoder = WalStreamDecoder::new(startpos, PgMajorVersion::PG16);
         }
         self.decoder.feed_bytes(buf);
         loop {
@@ -242,7 +242,7 @@ impl wal_storage::Storage for DiskWALStorage {
         self.write_record_lsn = end_pos;
         self.flush_record_lsn = end_pos;
         self.unflushed_bytes.clear();
-        self.decoder = WalStreamDecoder::new(end_pos, 16);
+        self.decoder = WalStreamDecoder::new(end_pos, PgMajorVersion::PG16);
 
         Ok(())
     }

storage_controller/src/service/safekeeper_service.rs

@@ -18,6 +18,7 @@ use pageserver_api::controller_api::{
     SafekeeperDescribeResponse, SkSchedulingPolicy, TimelineImportRequest,
 };
 use pageserver_api::models::{SafekeeperInfo, SafekeepersInfo, TimelineInfo};
+use safekeeper_api::PgVersionId;
 use safekeeper_api::membership::{MemberSet, SafekeeperGeneration, SafekeeperId};
 use tokio::task::JoinSet;
 use tokio_util::sync::CancellationToken;
@@ -44,7 +45,7 @@ impl Service {
         &self,
         tenant_id: TenantId,
         timeline_id: TimelineId,
-        pg_version: u32,
+        pg_version: PgVersionId,
         timeline_persistence: &TimelinePersistence,
     ) -> Result<Vec<NodeId>, ApiError> {
         // If quorum is reached, return if we are outside of a specified timeout
@@ -219,7 +220,7 @@ impl Service {
         read_only: bool,
     ) -> Result<SafekeepersInfo, ApiError> {
         let timeline_id = timeline_info.timeline_id;
-        let pg_version = timeline_info.pg_version * 10000;
+        let pg_version = PgVersionId::from(timeline_info.pg_version);
         // Initially start_lsn is determined by last_record_lsn in pageserver
         // response as it does initdb. However, later we persist it and in sk
         // creation calls replace with the value from the timeline row if it

test_runner/regress/test_branching.py

@@ -172,7 +172,7 @@ def test_cannot_create_endpoint_on_non_uploaded_timeline(neon_env_builder: NeonE
             env.initial_tenant,
             env.initial_timeline,
             MembershipConfiguration(generation=1, members=[sk.safekeeper_id()], new_members=None),
-            int(env.pg_version),
+            int(env.pg_version) * 10000,
             Lsn(0),
             None,
         )