diff options
| author | Zach Koopmans <zkoopmans@google.com> | 2019-08-19 14:06:22 -0700 |
|---|---|---|
| committer | gVisor bot <gvisor-bot@google.com> | 2019-08-19 14:07:44 -0700 |
| commit | 67d7864f839037c5188c2a9e7ec5e7b11a7672a2 (patch) | |
| tree | e441d7e61cfd5bd6012fb7b4b13f7e43f79e4015 /pkg/sentry/syscalls | |
| parent | 3ffbdffd7e96e406fd3136818e0402cf0c2f0d4d (diff) | |
Document RWF_HIPRI not implemented for preadv2/pwritev2.
Document limitation of no reasonable implementation for RWF_HIPRI
flag (High Priority Read/Write for block-based file systems).
PiperOrigin-RevId: 264237589
Diffstat (limited to 'pkg/sentry/syscalls')
| -rw-r--r-- | pkg/sentry/syscalls/linux/sys_read.go | 3 | ||||
| -rw-r--r-- | pkg/sentry/syscalls/linux/sys_write.go | 3 |
2 files changed, 4 insertions, 2 deletions
diff --git a/pkg/sentry/syscalls/linux/sys_read.go b/pkg/sentry/syscalls/linux/sys_read.go index b2474e60d..3ab54271c 100644 --- a/pkg/sentry/syscalls/linux/sys_read.go +++ b/pkg/sentry/syscalls/linux/sys_read.go @@ -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 } diff --git a/pkg/sentry/syscalls/linux/sys_write.go b/pkg/sentry/syscalls/linux/sys_write.go index 5278c96a6..27cd2c336 100644 --- a/pkg/sentry/syscalls/linux/sys_write.go +++ b/pkg/sentry/syscalls/linux/sys_write.go @@ -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 } |