4be6bc7251
unsafe impls for `Send` and `Sync` should not be added by default. in the case of `SlotGuard` removing them does not cause any issues, as the compiler automatically derives those. This PR adds requirement to document the unsafety (see [clippy::undocumented_unsafe_blocks]) and opportunistically adds `#![deny(unsafe_code)]` to most places where we don't have unsafe code right now. TRPL on Send and Sync: https://doc.rust-lang.org/book/ch16-04-extensible-concurrency-sync-and-send.html [clippy::undocumented_unsafe_blocks]: https://rust-lang.github.io/rust-clippy/master/#/undocumented_unsafe_blocks
This module contains utilities for working with PostgreSQL file formats. It's a collection of structs that are auto-generated from the PostgreSQL header files using bindgen, and Rust functions to read and manipulate them.
There are also a bunch of constants in pg_constants.rs that are copied
from various PostgreSQL headers, rather than auto-generated. They mostly
should be auto-generated too, but that's a TODO.
The PostgreSQL on-disk file format is not portable across different
CPU architectures and operating systems. It is also subject to change
in each major PostgreSQL version. Currently, this module supports
PostgreSQL v14, v15 and v16: bindings and code that depends on them are
version-specific.
This code is organized in modules postgres_ffi::v14, postgres_ffi::v15 and
postgres_ffi::v16. Version independent code is explicitly exported into
shared postgres_ffi.
TODO: Currently, there is also some code that deals with WAL records in pageserver/src/waldecoder.rs. That should be moved into this module. The rest of the codebase should not have intimate knowledge of PostgreSQL file formats or WAL layout, that knowledge should be encapsulated in this module.