From patchwork Mon Sep 16 13:55:20 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yiyang Wu X-Patchwork-Id: 13805447 Received: from mail.tlmp.cc (unknown [148.135.17.20]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 935E1155A59; Mon, 16 Sep 2024 13:56:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.135.17.20 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726494970; cv=none; b=RY7w8D92Wco6PJsq72zP3iT0u9zcZy3GNh31nX29MyWCvRZjg++FtvBe9Nz7fmSuMdj4k8rgF0PjBfBcuz3VNUC6+2waiwCbyrSE7Qr/W8BxEJ2RxyN6uM20G+bCR/m24/zto2pHKQ7rYM4VAR666y8+fAp6BYGgOpGymCpvRKo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726494970; c=relaxed/simple; bh=vQLgpg+Uh6AnmzozA6msIhCQdsV7m8apo306xrKuq7U=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=hcoJ5A7960sbi8wmIYOD3p/o2l0+E5xsqXKNyqe1JoYx4EGviG7IIPp0ysCD4C2XwKxdvG8gHPobY0ck41QleTHQ+hrQtu5uo4y3RybK8338AwcSIM/t+eWWak0ZiXo5WEn135EZ3hz+KQxmHYBE+PmfLrDSXECueq0wdqCI5O8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=tlmp.cc; spf=pass smtp.mailfrom=tlmp.cc; dkim=pass (2048-bit key) header.d=tlmp.cc header.i=@tlmp.cc header.b=gyk0nQmk; arc=none smtp.client-ip=148.135.17.20 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=tlmp.cc Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=tlmp.cc Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=tlmp.cc header.i=@tlmp.cc header.b="gyk0nQmk" Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id 8EAF26997C; Mon, 16 Sep 2024 09:56:05 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tlmp.cc; s=dkim; t=1726494966; h=from:subject:date:message-id:to:cc:mime-version: content-transfer-encoding:in-reply-to:references; bh=ZuP3bujGZDBP75xkwLAFw1ksH6b/fY1knDKclkC/wOs=; b=gyk0nQmkxsEqOOxgE8ynnJjvoHp7k6fjXxzCvSyGQOfo+h9L0F5KJATkjaAn0pWRdTQET5 Ue3ZEkO9CNHy3yU0EEktidTpqs37MehOPJvMo1OfE+r8OWe6W5R1FAYIvXTk5R8vhMjngK /kFb/8wgj2A7qaVWEbHumKFTmOLw8Tx8NoSubGjhKlKjao3eo63ffH2xIeH5/GERY/SBwX I6N6IBG8vCe67HLzkEbYvzW3UmEaM+97jK8Ojlckv7G71Hyh54Ug2Ny5UMibB1ln0qr6yg tfFRmmQzVy8oFe/9IV0xkW75hEIocoxCZQWudbMlxHk8N6O/NkaKhZcC7gKfqQ== From: Yiyang Wu To: linux-erofs@lists.ozlabs.org Cc: rust-for-linux@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [RFC PATCH 03/24] erofs: add Errno in Rust Date: Mon, 16 Sep 2024 21:55:20 +0800 Message-ID: <20240916135541.98096-4-toolmanp@tlmp.cc> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240916135541.98096-1-toolmanp@tlmp.cc> References: <20240916135541.98096-1-toolmanp@tlmp.cc> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Last-TLS-Session-Version: TLSv1.3 Introduce Errno to Rust side code. Note that in current Rust For Linux, Errnos are implemented as core::ffi::c_uint unit structs. However, EUCLEAN, a.k.a EFSCORRUPTED is missing from error crate. Since the errno_base hasn't changed for over 13 years, This patch merely serves as a temporary workaround for the missing errno in the Rust For Linux. Signed-off-by: Yiyang Wu --- fs/erofs/rust/erofs_sys.rs | 6 + fs/erofs/rust/erofs_sys/errnos.rs | 191 ++++++++++++++++++++++++++++++ 2 files changed, 197 insertions(+) create mode 100644 fs/erofs/rust/erofs_sys/errnos.rs diff --git a/fs/erofs/rust/erofs_sys.rs b/fs/erofs/rust/erofs_sys.rs index 0f1400175fc2..2bd1381da5ab 100644 --- a/fs/erofs/rust/erofs_sys.rs +++ b/fs/erofs/rust/erofs_sys.rs @@ -19,4 +19,10 @@ pub(crate) type Nid = u64; /// Erofs Super Offset to read the ondisk superblock pub(crate) const EROFS_SUPER_OFFSET: Off = 1024; +/// PosixResult as a type alias to kernel::error::Result +/// to avoid naming conflicts. +pub(crate) type PosixResult = Result; + +pub(crate) mod errnos; pub(crate) mod superblock; +pub(crate) use errnos::Errno; diff --git a/fs/erofs/rust/erofs_sys/errnos.rs b/fs/erofs/rust/erofs_sys/errnos.rs new file mode 100644 index 000000000000..40e5cdbcb353 --- /dev/null +++ b/fs/erofs/rust/erofs_sys/errnos.rs @@ -0,0 +1,191 @@ +// Copyright 2024 Yiyang Wu +// SPDX-License-Identifier: MIT or GPL-2.0-or-later + +#[repr(i32)] +#[non_exhaustive] +#[allow(clippy::upper_case_acronyms)] +#[derive(Debug, Copy, Clone, PartialEq)] +pub(crate) enum Errno { + NONE = 0, + EPERM, + ENOENT, + ESRCH, + EINTR, + EIO, + ENXIO, + E2BIG, + ENOEXEC, + EBADF, + ECHILD, + EAGAIN, + ENOMEM, + EACCES, + EFAULT, + ENOTBLK, + EBUSY, + EEXIST, + EXDEV, + ENODEV, + ENOTDIR, + EISDIR, + EINVAL, + ENFILE, + EMFILE, + ENOTTY, + ETXTBSY, + EFBIG, + ENOSPC, + ESPIPE, + EROFS, + EMLINK, + EPIPE, + EDOM, + ERANGE, + EDEADLK, + ENAMETOOLONG, + ENOLCK, + ENOSYS, + ENOTEMPTY, + ELOOP, + ENOMSG = 42, + EIDRM, + ECHRNG, + EL2NSYNC, + EL3HLT, + EL3RST, + ELNRNG, + EUNATCH, + ENOCSI, + EL2HLT, + EBADE, + EBADR, + EXFULL, + ENOANO, + EBADRQC, + EBADSLT, + EBFONT = 59, + ENOSTR, + ENODATA, + ETIME, + ENOSR, + ENONET, + ENOPKG, + EREMOTE, + ENOLINK, + EADV, + ESRMNT, + ECOMM, + EPROTO, + EMULTIHOP, + EDOTDOT, + EBADMSG, + EOVERFLOW, + ENOTUNIQ, + EBADFD, + EREMCHG, + ELIBACC, + ELIBBAD, + ELIBSCN, + ELIBMAX, + ELIBEXEC, + EILSEQ, + ERESTART, + ESTRPIPE, + EUSERS, + ENOTSOCK, + EDESTADDRREQ, + EMSGSIZE, + EPROTOTYPE, + ENOPROTOOPT, + EPROTONOSUPPORT, + ESOCKTNOSUPPORT, + EOPNOTSUPP, + EPFNOSUPPORT, + EAFNOSUPPORT, + EADDRINUSE, + EADDRNOTAVAIL, + ENETDOWN, + ENETUNREACH, + ENETRESET, + ECONNABORTED, + ECONNRESET, + ENOBUFS, + EISCONN, + ENOTCONN, + ESHUTDOWN, + ETOOMANYREFS, + ETIMEDOUT, + ECONNREFUSED, + EHOSTDOWN, + EHOSTUNREACH, + EALREADY, + EINPROGRESS, + ESTALE, + EUCLEAN, + ENOTNAM, + ENAVAIL, + EISNAM, + EREMOTEIO, + EDQUOT, + ENOMEDIUM, + EMEDIUMTYPE, + ECANCELED, + ENOKEY, + EKEYEXPIRED, + EKEYREVOKED, + EKEYREJECTED, + EOWNERDEAD, + ENOTRECOVERABLE, + ERFKILL, + EHWPOISON, + EUNKNOWN, +} + +impl From for Errno { + fn from(value: i32) -> Self { + if (-value) <= 0 || (-value) > Errno::EUNKNOWN as i32 { + Errno::EUNKNOWN + } else { + // Safety: The value is guaranteed to be a valid errno and the memory + // layout is the same for both types. + unsafe { core::mem::transmute(value) } + } + } +} + +impl From for i32 { + fn from(value: Errno) -> Self { + -(value as i32) + } +} + +/// Replacement for ERR_PTR in Linux Kernel. +impl From for *const core::ffi::c_void { + fn from(value: Errno) -> Self { + (-(value as core::ffi::c_long)) as *const core::ffi::c_void + } +} + +impl From for *mut core::ffi::c_void { + fn from(value: Errno) -> Self { + (-(value as core::ffi::c_long)) as *mut core::ffi::c_void + } +} + +/// Replacement for PTR_ERR in Linux Kernel. +impl From<*const core::ffi::c_void> for Errno { + fn from(value: *const core::ffi::c_void) -> Self { + (-(value as i32)).into() + } +} + +impl From<*mut core::ffi::c_void> for Errno { + fn from(value: *mut core::ffi::c_void) -> Self { + (-(value as i32)).into() + } +} +/// Replacement for IS_ERR in Linux Kernel. +#[inline(always)] +pub(crate) fn is_value_err(value: *const core::ffi::c_void) -> bool { + (value as core::ffi::c_ulong) >= (-4095 as core::ffi::c_long) as core::ffi::c_ulong +}