From 587cb05ec42417a05ed371d500b8734b10cf60f7 Mon Sep 17 00:00:00 2001
From: Alejandro Soto <alejandro@34project.org>
Date: Wed, 5 Jan 2022 07:58:36 -0600
Subject: Implement Link

---
 examples/passthrough.rs |  1 +
 src/ops/entry.rs        | 27 +++++++++++++++++++++++++++
 src/ops/mod.rs          |  2 +-
 src/ops/traits.rs       |  9 ++++++++-
 src/session.rs          |  3 +++
 5 files changed, 40 insertions(+), 2 deletions(-)

diff --git a/examples/passthrough.rs b/examples/passthrough.rs
index 0e0f2c9..32f50ca 100644
--- a/examples/passthrough.rs
+++ b/examples/passthrough.rs
@@ -368,6 +368,7 @@ async fn main_loop(session: Start, mut fs: Passthrough) -> FuseResult<()> {
                 Mkdir(mkdir) => fs.mkdir(mkdir.op()?).await,
                 Unlink(unlink) => fs.unlink(unlink.op()?).await,
                 Rmdir(rmdir) => fs.rmdir(rmdir.op()?).await,
+                //TODO: Link
                 Open(open) => fs.open(open.op()?).await,
                 Read(read) => fs.read(read.op()?).await,
                 Write(write) => fs.write(write.op()?).await,
diff --git a/src/ops/entry.rs b/src/ops/entry.rs
index 4f0b76f..74072ef 100644
--- a/src/ops/entry.rs
+++ b/src/ops/entry.rs
@@ -16,11 +16,16 @@ pub enum Getattr {}
 pub enum Mkdir {}
 pub enum Unlink {}
 pub enum Rmdir {}
+pub enum Link {}
 
 pub trait RequestForget<'o>: Operation<'o> {
     fn forget_list<'a>(request: &'a Request<'o, Self>) -> ForgetList<'a>;
 }
 
+pub trait RequestLink<'o>: Operation<'o> {
+    fn source_ino(request: &Request<'o, Self>) -> Ino;
+}
+
 pub trait ReplyStat<'o>: Operation<'o> {
     fn stat(reply: Reply<'o, Self>, inode: &impl Stat) -> Done<'o>;
 }
@@ -35,6 +40,7 @@ impl Sealed for Getattr {}
 impl Sealed for Mkdir {}
 impl Sealed for Unlink {}
 impl Sealed for Rmdir {}
+impl Sealed for Link {}
 
 impl<'o> Operation<'o> for Forget {
     type RequestBody = proto::OpcodeSelect<
@@ -66,6 +72,11 @@ impl<'o> Operation<'o> for Rmdir {
     type ReplyState = ();
 }
 
+impl<'o> Operation<'o> for Link {
+    type RequestBody = (&'o proto::LinkIn, &'o CStr);
+    type ReplyState = ();
+}
+
 impl<'o> RequestForget<'o> for Forget {
     fn forget_list<'a>(request: &'a Request<'o, Self>) -> ForgetList<'a> {
         use {proto::OpcodeSelect::*, ForgetList::*};
@@ -149,3 +160,19 @@ impl<'o> RequestName<'o> for Rmdir {
 }
 
 impl<'o> ReplyOk<'o> for Rmdir {}
+
+impl<'o> RequestName<'o> for Link {
+    fn name<'a>(request: &'a Request<'o, Self>) -> &'a OsStr {
+        let (_header, name) = request.body;
+        c_to_os(name)
+    }
+}
+
+impl<'o> RequestLink<'o> for Link {
+    fn source_ino(request: &Request<'o, Self>) -> Ino {
+        let (header, _name) = request.body;
+        Ino(header.old_ino)
+    }
+}
+
+impl<'o> ReplyKnown<'o> for Link {}
diff --git a/src/ops/mod.rs b/src/ops/mod.rs
index 49ceaa9..2970ef8 100644
--- a/src/ops/mod.rs
+++ b/src/ops/mod.rs
@@ -12,7 +12,7 @@ use bytemuck::{bytes_of, Pod};
 pub mod traits;
 
 pub use dir::{BufferedReaddir, Lookup, Readdir};
-pub use entry::{Forget, Getattr, Mkdir, Rmdir, Unlink};
+pub use entry::{Forget, Getattr, Link, Mkdir, Rmdir, Unlink};
 pub use global::{Init, Statfs};
 pub use open::{Access, Open, Opendir, Release, Releasedir};
 pub use rw::{Flush, Read, Readlink, Write};
diff --git a/src/ops/traits.rs b/src/ops/traits.rs
index 9808358..6a4b1ce 100644
--- a/src/ops/traits.rs
+++ b/src/ops/traits.rs
@@ -5,7 +5,7 @@ use crate::{
 
 pub use super::{
     dir::{ReplyEntries, ReplyFound},
-    entry::{ReplyStat, RequestForget},
+    entry::{ReplyStat, RequestForget, RequestLink},
     global::ReplyFsInfo,
     open::{ReplyOpen, ReplyPermissionDenied},
     rw::ReplyAll,
@@ -145,6 +145,13 @@ impl<'o, O: Operation<'o>> Request<'o, O> {
     {
         O::forget_list(self)
     }
+
+    pub fn source_ino(&self) -> Ino
+    where
+        O: RequestLink<'o>,
+    {
+        O::source_ino(self)
+    }
 }
 
 impl<'o, O: Operation<'o>> Reply<'o, O> {
diff --git a/src/session.rs b/src/session.rs
index 7001e71..5f6336f 100644
--- a/src/session.rs
+++ b/src/session.rs
@@ -62,6 +62,7 @@ pub enum Dispatch<'o> {
     Mkdir(Incoming<'o, ops::Mkdir>),
     Unlink(Incoming<'o, ops::Unlink>),
     Rmdir(Incoming<'o, ops::Rmdir>),
+    Link(Incoming<'o, ops::Link>),
     Open(Incoming<'o, ops::Open>),
     Read(Incoming<'o, ops::Read>),
     Write(Incoming<'o, ops::Write>),
@@ -258,6 +259,7 @@ impl<'o> Dispatch<'o> {
             Mkdir(incoming) => incoming.common,
             Unlink(incoming) => incoming.common,
             Rmdir(incoming) => incoming.common,
+            Link(incoming) => incoming.common,
             Open(incoming) => incoming.common,
             Read(incoming) => incoming.common,
             Write(incoming) => incoming.common,
@@ -341,6 +343,7 @@ impl Endpoint<'_> {
                 Mkdir => dispatch!(Mkdir),
                 Unlink => dispatch!(Unlink),
                 Rmdir => dispatch!(Rmdir),
+                Link => dispatch!(Link),
                 Open => dispatch!(Open),
                 Read => dispatch!(Read),
                 Write => dispatch!(Write),
-- 
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