From 5ad6da0370cd33230922394817cdb4d0b1e19c93 Mon Sep 17 00:00:00 2001
From: Chuyan Zhang <me@zcy.moe>
Date: Sat, 2 Dec 2023 12:10:49 -0800
Subject: add hard link (why did i forget that!!)

---
 ayafs-core/src/filesystem/trait_impl.rs | 70 +++++++++++++++++++++++++++------
 1 file changed, 57 insertions(+), 13 deletions(-)

diff --git a/ayafs-core/src/filesystem/trait_impl.rs b/ayafs-core/src/filesystem/trait_impl.rs
index 1c3c7b3..356cc59 100644
--- a/ayafs-core/src/filesystem/trait_impl.rs
+++ b/ayafs-core/src/filesystem/trait_impl.rs
@@ -5,7 +5,7 @@ use crate::utils::permissions::{check_access, clear_suid_sgid, get_groups};
 use crate::utils::{from_filetype, from_systime, time_now, to_fileattr, to_filetype};
 use crate::{AyaFS, TTL};
 use fuser::TimeOrNow::{Now, SpecificTime};
-use fuser::{FileType, Filesystem, KernelConfig, ReplyAttr, ReplyData, ReplyDirectory, ReplyEmpty, ReplyEntry, ReplyOpen, ReplyWrite, Request, TimeOrNow, ReplyStatfs};
+use fuser::{FileType, Filesystem, KernelConfig, ReplyAttr, ReplyData, ReplyDirectory, ReplyEmpty, ReplyEntry, ReplyOpen, ReplyWrite, Request, TimeOrNow, ReplyStatfs, FileAttr};
 use libc::{
     c_int, EACCES, EBADF, EEXIST, EINVAL, EIO, EISDIR, ENAMETOOLONG, ENOENT, ENOSPC, ENOTDIR,
     ENOTEMPTY, EPERM, O_ACCMODE, O_RDONLY, O_RDWR, O_WRONLY, RENAME_EXCHANGE,
@@ -63,18 +63,6 @@ impl Filesystem for AyaFS {
         }
     }
 
-    // fn getxattr(&mut self, _req: &Request<'_>, ino: u64, name: &OsStr, size: u32, reply: ReplyXattr) {
-    //     if let Some(inode) = self.get_inode(ino as usize) {
-    //         debug!(
-    //             "getattr(ino: {}, incoming_uid: {}, inode_uid: {})",
-    //             ino, _req.uid(), inode.uid,
-    //         );
-    //         reply.error(ENOENT);
-    //     } else {
-    //         reply.error(ENOENT);
-    //     }
-    // }
-
     fn getattr(&mut self, _req: &Request<'_>, ino: u64, reply: ReplyAttr) {
         if let Some(inode) = self.get_inode(ino as usize) {
             debug!(
@@ -944,6 +932,62 @@ impl Filesystem for AyaFS {
         }
     }
 
+    fn link(&mut self, req: &Request<'_>, ino: u64, new_parent: u64, new_name: &OsStr, reply: ReplyEntry) {
+        let ino = ino as usize;
+        let new_parent = new_parent as usize;
+
+        if let Some(parent_inode) = self.get_inode(new_parent) {
+            if !check_access(
+                req.uid(),
+                req.gid(),
+                parent_inode.uid,
+                parent_inode.gid,
+                parent_inode.mode,
+                W_OK,
+            ) {
+                reply.error(EACCES);
+                return;
+            }
+
+            if !parent_inode.is_dir() {
+                reply.error(ENOTDIR);
+                return;
+            }
+
+            if new_name.len() > 255 {
+                reply.error(ENAMETOOLONG);
+                return;
+            }
+
+            let filetype: FileType;
+            let fileattr: FileAttr;
+            let mut parent_inode = parent_inode.clone();
+            if let Some(inode) = self.get_inode_mut(ino) {
+                inode.n_links += 1;
+                filetype = inode.file_type();
+                fileattr = to_fileattr(ino, inode);
+            } else {
+                reply.error(ENOENT);
+                return;
+            }
+
+            if let Err(err_code) = self.add_direntry(
+                new_parent,
+                &mut parent_inode,
+                ino as usize,
+                new_name,
+                from_filetype(filetype)
+            ) {
+                reply.error(err_code);
+                return;
+            }
+            self.update_inode(new_parent, parent_inode);
+            reply.entry(&TTL, &fileattr, 0);
+        } else {
+            reply.error(ENOENT);
+        }
+    }
+
     fn open(&mut self, req: &Request<'_>, ino: u64, flags: i32, reply: ReplyOpen) {
         debug!("open(ino: {:#x?}, flags: {:#x?})", ino, flags);
         let (access_mask, read, write) = match flags & O_ACCMODE {
-- 
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