diff options
| author | Andrei Vagin <avagin@google.com> | 2019-06-18 01:42:28 -0700 |
|---|---|---|
| committer | gVisor bot <gvisor-bot@google.com> | 2019-06-18 01:43:29 -0700 |
| commit | 8ab0848c70fcebe377a0e7abdebf371022c96830 (patch) | |
| tree | 2df3d5cc1dd521497e6b890c54a4a7ae42c40a05 /pkg/sentry/fs/dev | |
| parent | 3d1e44a677ecacbf81888211a93cef0a71c1c6c0 (diff) | |
gvisor/fs: don't update file.offset for sockets, pipes, etc
sockets, pipes and other non-seekable file descriptors don't
use file.offset, so we don't need to update it.
With this change, we will be able to call file operations
without locking the file.mu mutex. This is already used for
pipes in the splice system call.
PiperOrigin-RevId: 253746644
Diffstat (limited to 'pkg/sentry/fs/dev')
| -rw-r--r-- | pkg/sentry/fs/dev/null.go | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/pkg/sentry/fs/dev/null.go b/pkg/sentry/fs/dev/null.go index 18dd08515..4404b97ef 100644 --- a/pkg/sentry/fs/dev/null.go +++ b/pkg/sentry/fs/dev/null.go @@ -97,6 +97,7 @@ func newZeroDevice(ctx context.Context, owner fs.FileOwner, mode linux.FileMode) func (zd *zeroDevice) GetFile(ctx context.Context, dirent *fs.Dirent, flags fs.FileFlags) (*fs.File, error) { flags.Pread = true flags.Pwrite = true + flags.NonSeekable = true return fs.NewFile(ctx, dirent, flags, &zeroFileOperations{}), nil } |