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houseme
c79366d42c
Two behavior-preserving cleanups to the io_uring local read backend that accumulated as later work layered onto it: - Reunite the `UringBackend` struct doc comment. The backlog#1145 fd-cache constants were inserted into the middle of the struct's doc block, so its opening sentences were orphaned onto `ENV_RUSTFS_IO_URING_FD_CACHE` and the struct itself was documented by a sentence fragment starting mid-clause with "through rustfs-uring's...". Move the opening back onto the struct and give the constant its own one-line doc. - Fold the fd-cache handle and its lookup key into a single `Option<(&FdCache, FdKey)>` in `pread_uring`, so the get and the insert_if_fresh sites stop re-deriving `self.fd_cache.as_ref()` and re-matching presence. Semantics are identical, including the backlog#1176 generation guard (`gen_at_open` snapshot before open, insert only when the generation is unchanged). No functional change. The borrow/move pattern was validated against a host-compilable reduction (the cfg(linux) path cannot be built from macOS); CI compiles the Linux backend. Co-authored-by: heihutu <heihutu@gmail.com>