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Support pipes and sockets in VFS2 gofer fs.

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Named pipes and sockets can be represented in two ways in gofer fs:
1. As a file on the remote filesystem. In this case, all file operations are
   passed through 9p.
2. As a synthetic file that is internal to the sandbox. In this case, the
   dentry stores an endpoint or VFSPipe for sockets and pipes respectively,
   which replaces interactions with the remote fs through the gofer.
In gofer.filesystem.MknodAt, we attempt to call mknod(2) through 9p,
and if it fails, fall back to the synthetic version.

Updates #1200.

PiperOrigin-RevId: 308828161
This commit is contained in:
Dean Deng
2020-04-28 08:34:00 -07:00
committed by gVisor bot
parent 316394ee89
commit f3ca5ca82a
14 changed files with 359 additions and 77 deletions
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pkg/sentry/fsimpl/tmpfs/filesystem.go
+1 -1
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@@ -697,7 +697,7 @@ func (fs *filesystem) UnlinkAt(ctx context.Context, rp *vfs.ResolvingPath) error
}
// BoundEndpointAt implements FilesystemImpl.BoundEndpointAt.
func (fs *filesystem) BoundEndpointAt(ctx context.Context, rp *vfs.ResolvingPath) (transport.BoundEndpoint, error) {
func (fs *filesystem) BoundEndpointAt(ctx context.Context, rp *vfs.ResolvingPath, opts vfs.BoundEndpointOptions) (transport.BoundEndpoint, error) {
fs.mu.RLock()
defer fs.mu.RUnlock()
d, err := resolveLocked(rp)