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Document RWF_HIPRI not implemented for preadv2/pwritev2.

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Document limitation of no reasonable implementation for RWF_HIPRI
flag (High Priority Read/Write for block-based file systems).

PiperOrigin-RevId: 264237589
This commit is contained in:
Zach Koopmans
2019-08-19 14:07:44 -07:00
committed by gVisor bot
parent 3ffbdffd7e
commit 67d7864f83
3 changed files with 6 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
pkg/abi/linux/file.go
+2
View File
@@ -178,6 +178,8 @@ const (
// Values for preadv2/pwritev2.
const (
// Note: gVisor does not implement the RWF_HIPRI feature, but the flag is
// accepted as a valid flag argument for preadv2/pwritev2.
RWF_HIPRI = 0x00000001
RWF_DSYNC = 0x00000002
RWF_SYNC = 0x00000004
pkg/sentry/syscalls/linux/sys_read.go
+2 -1
View File
@@ -191,7 +191,6 @@ func Preadv(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.Syscal
}
// Preadv2 implements linux syscall preadv2(2).
// TODO(b/120162627): Implement RWF_HIPRI functionality.
func Preadv2(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
// While the syscall is
// preadv2(int fd, struct iovec* iov, int iov_cnt, off_t offset, int flags)
@@ -228,6 +227,8 @@ func Preadv2(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.Sysca
}
// Check flags field.
// Note: gVisor does not implement the RWF_HIPRI feature, but the flag is
// accepted as a valid flag argument for preadv2.
if flags&^linux.RWF_VALID != 0 {
return 0, nil, syserror.EOPNOTSUPP
}
pkg/sentry/syscalls/linux/sys_write.go
+2 -1
View File
@@ -191,7 +191,6 @@ func Pwritev(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.Sysca
}
// Pwritev2 implements linux syscall pwritev2(2).
// TODO(b/120162627): Implement RWF_HIPRI functionality.
// TODO(b/120161091): Implement O_SYNC and D_SYNC functionality.
func Pwritev2(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
// While the syscall is
@@ -227,6 +226,8 @@ func Pwritev2(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.Sysc
return 0, nil, syserror.ESPIPE
}
// Note: gVisor does not implement the RWF_HIPRI feature, but the flag is
// accepted as a valid flag argument for pwritev2.
if flags&^linux.RWF_VALID != 0 {
return uintptr(flags), nil, syserror.EOPNOTSUPP
}