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charset="utf-8" Content-Transfer-Encoding: quoted-printable This allows fops to access information about the underlying struct file for the miscdevice. For example, the Binder driver needs to inspect the O_NONBLOCK flag inside the fops->ioctl() hook. Signed-off-by: Alice Ryhl Reviewed-by: Lee Jones Tested-by: Lee Jones --- rust/kernel/miscdevice.rs | 31 +++++++++++++++++++++++++------ 1 file changed, 25 insertions(+), 6 deletions(-) diff --git a/rust/kernel/miscdevice.rs b/rust/kernel/miscdevice.rs index 7e2a79b3ae26..0cb79676c139 100644 --- a/rust/kernel/miscdevice.rs +++ b/rust/kernel/miscdevice.rs @@ -11,6 +11,7 @@ use crate::{ bindings, error::{to_result, Error, Result, VTABLE_DEFAULT_ERROR}, + fs::File, prelude::*, str::CStr, types::{ForeignOwnable, Opaque}, @@ -103,10 +104,10 @@ pub trait MiscDevice { /// Called when the misc device is opened. /// /// The returned pointer will be stored as the private data for the fi= le. - fn open() -> Result; + fn open(_file: &File) -> Result; =20 /// Called when the misc device is released. - fn release(device: Self::Ptr) { + fn release(device: Self::Ptr, _file: &File) { drop(device); } =20 @@ -117,6 +118,7 @@ fn release(device: Self::Ptr) { /// [`kernel::ioctl`]: mod@crate::ioctl fn ioctl( _device: ::Borrowed<'_>, + _file: &File, _cmd: u32, _arg: usize, ) -> Result { @@ -133,6 +135,7 @@ fn ioctl( #[cfg(CONFIG_COMPAT)] fn compat_ioctl( _device: ::Borrowed<'_>, + _file: &File, _cmd: u32, _arg: usize, ) -> Result { @@ -187,7 +190,10 @@ impl VtableHelper { return ret; } =20 - let ptr =3D match T::open() { + // SAFETY: + // * The file is valid for the duration of this call. + // * There is no active fdget_pos region on the file on this thread. + let ptr =3D match T::open(unsafe { File::from_raw_file(file) }) { Ok(ptr) =3D> ptr, Err(err) =3D> return err.to_errno(), }; @@ -211,7 +217,10 @@ impl VtableHelper { // SAFETY: The release call of a file owns the private data. let ptr =3D unsafe { ::from_foreign(private)= }; =20 - T::release(ptr); + // SAFETY: + // * The file is valid for the duration of this call. + // * There is no active fdget_pos region on the file on this thread. + T::release(ptr, unsafe { File::from_raw_file(file) }); =20 0 } @@ -229,7 +238,12 @@ impl VtableHelper { // SAFETY: Ioctl calls can borrow the private data of the file. let device =3D unsafe { ::borrow(private) }; =20 - match T::ioctl(device, cmd, arg as usize) { + // SAFETY: + // * The file is valid for the duration of this call. + // * There is no active fdget_pos region on the file on this thread. + let file =3D unsafe { File::from_raw_file(file) }; + + match T::ioctl(device, file, cmd, arg as usize) { Ok(ret) =3D> ret as c_long, Err(err) =3D> err.to_errno() as c_long, } @@ -249,7 +263,12 @@ impl VtableHelper { // SAFETY: Ioctl calls can borrow the private data of the file. let device =3D unsafe { ::borrow(private) }; =20 - match T::compat_ioctl(device, cmd, arg as usize) { + // SAFETY: + // * The file is valid for the duration of this call. + // * There is no active fdget_pos region on the file on this thread. + let file =3D unsafe { File::from_raw_file(file) }; + + match T::compat_ioctl(device, file, cmd, arg as usize) { Ok(ret) =3D> ret as c_long, Err(err) =3D> err.to_errno() as c_long, } --=20 2.47.1.613.gc27f4b7a9f-goog