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rust: use libc::Ioctl type for ioctl() request argument

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The second argument to ioctl() can be defined as a different type by
different libc implementations, and can be a different size on different
architectures depending on what type it is defined as. For example,
glibc defines it as `unsigned long` which may have a different size on
32-bit vs. 64-bit architectures, and musl libc defines it as `int`.

The Rust libc crate exposes a type `libc::Ioctl` which is defined as the
appropriate integer type for the given libc implementation. Using this
type for the request argument to `libc::ioctl()` ensures code will
compile correctly regardless of architecture and libc implementation.

Also, because ioctl request numbers are defined to be 32 bits
(regardless of the fact that `unsigned long` might sometimes take 64
bits on some architectures), this patch changes the Rust representation
of the bcachefs ioctl numbers to u32 instead of u64.

Signed-off-by: Thomas Bertschinger <tahbertschinger@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Thomas Bertschinger 2024-02-20 20:24:20 -07:00 committed by Kent Overstreet
parent de9c798382
commit 25e84a9917
2 changed files with 4 additions and 4 deletions
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4
bch_bindgen/src/libbcachefs_wrapper.h
View File

@ -33,5 +33,5 @@ MARK_FIX_753(blk_mode_t, BLK_OPEN_READ);
MARK_FIX_753(blk_mode_t, BLK_OPEN_WRITE);
MARK_FIX_753(blk_mode_t, BLK_OPEN_EXCL);
MARK_FIX_753(__u64, BCH_IOCTL_SUBVOLUME_CREATE);
MARK_FIX_753(__u64, BCH_IOCTL_SUBVOLUME_DESTROY);
MARK_FIX_753(__u32, BCH_IOCTL_SUBVOLUME_CREATE);
MARK_FIX_753(__u32, BCH_IOCTL_SUBVOLUME_DESTROY);

4
src/wrappers/handle.rs
View File

@ -22,7 +22,7 @@ impl BcachefsHandle {
/// I/O control commands that can be sent to a bcachefs filesystem
/// Those are non-exhaustive
#[repr(u64)]
#[repr(u32)]
#[non_exhaustive]
pub enum BcachefsIoctl {
SubvolumeCreate = BCH_IOCTL_SUBVOLUME_CREATE,
@ -47,7 +47,7 @@ impl BcachefsHandle {
/// Type-safe [`libc::ioctl`] for bcachefs filesystems
pub fn ioctl(&self, request: BcachefsIoctl, payload: &BcachefsIoctlPayload) -> Result<(), Errno> {
let payload_ptr: *const libc::c_void = payload.into();
let ret = unsafe { libc::ioctl(self.inner.ioctl_fd, request as u64, payload_ptr) };
let ret = unsafe { libc::ioctl(self.inner.ioctl_fd, request as libc::Ioctl, payload_ptr) };
if ret == -1 {
Err(errno::errno())