From 393b7a8ada2a41db102a419559f3fdaa5b3ec17f Mon Sep 17 00:00:00 2001
From: Rafal Mielniczuk <rafal.mielniczuk2@gmail.com>
Date: Tue, 24 Oct 2023 11:34:47 +0100
Subject: [PATCH] Add truncate syscall

---
 cykusz-rs/src/kernel/syscall/mod.rs |  1 +
 cykusz-rs/src/kernel/syscall/sys.rs | 13 +++++++++++--
 cykusz-rs/src/kernel/task/vm.rs     |  8 ++++----
 disk_scripts/make_disk.sh           |  2 +-
 syscall-defs/src/lib.rs             |  1 +
 5 files changed, 18 insertions(+), 7 deletions(-)

diff --git a/cykusz-rs/src/kernel/syscall/mod.rs b/cykusz-rs/src/kernel/syscall/mod.rs
index 23da1d8f..b9e1d93a 100644
--- a/cykusz-rs/src/kernel/syscall/mod.rs
+++ b/cykusz-rs/src/kernel/syscall/mod.rs
@@ -87,6 +87,7 @@ pub fn syscall_handler(num: u64, a: u64, b: u64, c: u64, d: u64, e: u64, f: u64)
         SYS_TICKSNS => sys::sys_ticksns(),
         SYS_GETPPID => sys::sys_getppid(),
         SYS_GETPGID => sys::sys_getpgid(a),
+        SYS_TRUNCATE => sys::sys_truncate(a, b),
         a => {
             logln!("NO SYS????? {}", a);
             Err(SyscallError::ENOSYS)
diff --git a/cykusz-rs/src/kernel/syscall/sys.rs b/cykusz-rs/src/kernel/syscall/sys.rs
index 9a0791b4..1f8a4226 100644
--- a/cykusz-rs/src/kernel/syscall/sys.rs
+++ b/cykusz-rs/src/kernel/syscall/sys.rs
@@ -460,6 +460,8 @@ pub fn sys_rmdir(path: u64, path_len: u64) -> SyscallResult {
 }
 
 pub fn sys_unlink(at: u64, path: u64, path_len: u64, flags: u64) -> SyscallResult {
+    let path = Path::new(make_str(path, path_len));
+    logln4!("sys_unlink: {}", path.str());
     if flags != 0 {
         return Err(SyscallError::EINVAL);
     }
@@ -471,9 +473,7 @@ pub fn sys_unlink(at: u64, path: u64, path_len: u64, flags: u64) -> SyscallResul
         return Err(SyscallError::EBADFD);
     }
 
-    let path = Path::new(make_str(path, path_len));
 
-    logln!("sys_unlink: {}", path.str());
 
     let (_, name) = path.containing_dir();
 
@@ -1103,6 +1103,15 @@ pub fn sys_dup2(fd: u64, new_fd: u64, flags: u64) -> SyscallResult {
         .duplicate_at(fd as usize, new_fd as usize, flags)
 }
 
+pub fn sys_truncate(fd: u64, size: u64) -> SyscallResult {
+    logln4!("truncate {} to size {}", fd, size);
+    let task = current_task_ref();
+
+    task.filetable().get_handle(fd as usize).ok_or(SyscallError::EBADFD)?.inode.inode().truncate(size as usize).map(|_r| {
+        Ok(0)
+    })?
+}
+
 pub fn sys_futex_wake(uaddr: u64) -> SyscallResult {
     let uaddr = VirtAddr(uaddr as usize);
 
diff --git a/cykusz-rs/src/kernel/task/vm.rs b/cykusz-rs/src/kernel/task/vm.rs
index 1efbfbbe..d4299513 100644
--- a/cykusz-rs/src/kernel/task/vm.rs
+++ b/cykusz-rs/src/kernel/task/vm.rs
@@ -812,16 +812,16 @@ impl VMData {
 
     fn log_vm(&self) {
         for e in self.maps.iter() {
-            if let Some(_f) = &e.mmaped_file {
+            if let Some(f) = &e.mmaped_file {
                 logln_disabled!(
                     "{} {}: {:?}, {:?} [ {} {:#x} {:#x} ]",
                     e.start,
                     e.end,
                     e.prot,
                     e.flags,
-                    _f.file.full_path(),
-                    _f.starting_offset,
-                    _f.len,
+                    f.file.full_path(),
+                    f.starting_offset,
+                    f.len,
                 );
             } else {
                 logln_disabled!("{} {}: {:?}, {:?}", e.start, e.end, e.prot, e.flags,);
diff --git a/disk_scripts/make_disk.sh b/disk_scripts/make_disk.sh
index 8c6c8b99..58908156 100755
--- a/disk_scripts/make_disk.sh
+++ b/disk_scripts/make_disk.sh
@@ -7,7 +7,7 @@ chown $1:$1 disk.img
 
 parted disk.img mktable msdos -s
 parted disk.img mkpart primary ext2 2048s 64MiB
-parted -- disk.img mkpart primary ext2 64Mib 3Gib # 112MB
+parted -- disk.img mkpart primary ext2 64Mib 3GiB # 112MB
 parted -- disk.img mkpart primary ext2 3GiB 3.5Gib # 64
 parted disk.img set 1 boot on
 
diff --git a/syscall-defs/src/lib.rs b/syscall-defs/src/lib.rs
index 101c26c4..8c45fda5 100644
--- a/syscall-defs/src/lib.rs
+++ b/syscall-defs/src/lib.rs
@@ -86,6 +86,7 @@ pub const SYS_TICKSNS: usize = 58;
 
 pub const SYS_GETPPID: usize = 59;
 pub const SYS_GETPGID: usize = 60;
+pub const SYS_TRUNCATE: usize = 61;
 
 #[derive(Copy, Clone, PartialEq, Debug)]
 #[repr(u64)]