diff --git a/Cargo.lock b/Cargo.lock
index 7896abc..a99d13d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -13,15 +13,15 @@ dependencies = [
 
 [[package]]
 name = "autocfg"
-version = "1.3.0"
+version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0c4b4d0bd25bd0b74681c0ad21497610ce1b7c91b1022cd21c80c6fbdd9476b0"
+checksum = "ace50bade8e6234aa140d9a2f552bbee1db4d353f69b8217bc503490fc1a9f26"
 
 [[package]]
 name = "bitflags"
-version = "2.5.0"
+version = "2.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cf4b9d6a944f767f8e5e0db018570623c85f3d925ac718db4e06d0187adb21c1"
+checksum = "b048fb63fd8b5923fc5aa7b340d8e156aec7ec02f0c78fa8a6ddc2613f6f71de"
 
 [[package]]
 name = "byteorder"
@@ -43,9 +43,9 @@ checksum = "67ba02a97a2bd10f4b59b25c7973101c79642302776489e030cd13cdab09ed15"
 
 [[package]]
 name = "critical-section"
-version = "1.1.2"
+version = "1.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7059fff8937831a9ae6f0fe4d658ffabf58f2ca96aa9dec1c889f936f705f216"
+checksum = "f64009896348fc5af4222e9cf7d7d82a95a256c634ebcf61c53e4ea461422242"
 
 [[package]]
 name = "embedded-io"
@@ -53,6 +53,12 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ef1a6892d9eef45c8fa6b9e0086428a2cca8491aca8f787c534a3d6d0bcb3ced"
 
+[[package]]
+name = "embedded-io"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "edd0f118536f44f5ccd48bcb8b111bdc3de888b58c74639dfb034a357d0f206d"
+
 [[package]]
 name = "fs_rpc"
 version = "0.1.0"
@@ -87,9 +93,9 @@ dependencies = [
 
 [[package]]
 name = "libc"
-version = "0.2.155"
+version = "0.2.159"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97b3888a4aecf77e811145cadf6eef5901f4782c53886191b2f693f24761847c"
+checksum = "561d97a539a36e26a9a5fad1ea11a3039a67714694aaa379433e580854bc3dc5"
 
 [[package]]
 name = "lock_api"
@@ -126,48 +132,49 @@ dependencies = [
 
 [[package]]
 name = "postcard"
-version = "1.0.8"
+version = "1.0.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a55c51ee6c0db07e68448e336cf8ea4131a620edefebf9893e759b2d793420f8"
+checksum = "5f7f0a8d620d71c457dd1d47df76bb18960378da56af4527aaa10f515eee732e"
 dependencies = [
  "cobs",
- "embedded-io",
+ "embedded-io 0.4.0",
+ "embedded-io 0.6.1",
  "heapless",
  "serde",
 ]
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.85"
+version = "1.0.86"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "22244ce15aa966053a896d1accb3a6e68469b97c7f33f284b99f0d576879fc23"
+checksum = "5e719e8df665df0d1c8fbfd238015744736151d4445ec0836b8e628aae103b77"
 dependencies = [
  "unicode-ident",
 ]
 
 [[package]]
 name = "quote"
-version = "1.0.36"
+version = "1.0.37"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0fa76aaf39101c457836aec0ce2316dbdc3ab723cdda1c6bd4e6ad4208acaca7"
+checksum = "b5b9d34b8991d19d98081b46eacdd8eb58c6f2b201139f7c5f643cc155a633af"
 dependencies = [
  "proc-macro2",
 ]
 
 [[package]]
 name = "redox_syscall"
-version = "0.5.1"
+version = "0.5.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "469052894dcb553421e483e4209ee581a45100d31b4018de03e5a7ad86374a7e"
+checksum = "9b6dfecf2c74bce2466cabf93f6664d6998a69eb21e39f4207930065b27b771f"
 dependencies = [
  "bitflags",
 ]
 
 [[package]]
 name = "rustc_version"
-version = "0.4.0"
+version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bfa0f585226d2e68097d4f95d113b15b83a82e819ab25717ec0590d9584ef366"
+checksum = "cfcb3a22ef46e85b45de6ee7e79d063319ebb6594faafcf1c225ea92ab6e9b92"
 dependencies = [
  "semver",
 ]
@@ -186,18 +193,14 @@ checksum = "61697e0a1c7e512e84a621326239844a24d8207b4669b41bc18b32ea5cbf988b"
 
 [[package]]
 name = "serde"
-version = "1.0.203"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7253ab4de971e72fb7be983802300c30b5a7f0c2e56fab8abfc6a214307c0094"
+version = "1.0.210"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.203"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "500cbc0ebeb6f46627f50f3f5811ccf6bf00643be300b4c3eabc0ef55dc5b5ba"
+version = "1.0.210"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -227,9 +230,9 @@ checksum = "a8f112729512f8e442d81f95a8a7ddf2b7c6b8a1a6f509a95864142b30cab2d3"
 
 [[package]]
 name = "syn"
-version = "2.0.66"
+version = "2.0.79"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c42f3f41a2de00b01c0aaad383c5a45241efc8b2d1eda5661812fda5f3cdcff5"
+checksum = "89132cd0bf050864e1d38dc3bbc07a0eb8e7530af26344d3d2bbbef83499f590"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -254,9 +257,9 @@ dependencies = [
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.12"
+version = "1.0.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
+checksum = "e91b56cd4cadaeb79bbf1a5645f6b4f8dc5bde8834ad5894a8db35fda9efa1fe"
 
 [[package]]
 name = "vfs"
@@ -279,9 +282,9 @@ dependencies = [
 
 [[package]]
 name = "windows-targets"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6f0713a46559409d202e70e28227288446bf7841d3211583a4b53e3f6d96e7eb"
+checksum = "9b724f72796e036ab90c1021d4780d4d3d648aca59e491e6b98e725b84e99973"
 dependencies = [
  "windows_aarch64_gnullvm",
  "windows_aarch64_msvc",
@@ -295,48 +298,48 @@ dependencies = [
 
 [[package]]
 name = "windows_aarch64_gnullvm"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7088eed71e8b8dda258ecc8bac5fb1153c5cffaf2578fc8ff5d61e23578d3263"
+checksum = "32a4622180e7a0ec044bb555404c800bc9fd9ec262ec147edd5989ccd0c02cd3"
 
 [[package]]
 name = "windows_aarch64_msvc"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9985fd1504e250c615ca5f281c3f7a6da76213ebd5ccc9561496568a2752afb6"
+checksum = "09ec2a7bb152e2252b53fa7803150007879548bc709c039df7627cabbd05d469"
 
 [[package]]
 name = "windows_i686_gnu"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "88ba073cf16d5372720ec942a8ccbf61626074c6d4dd2e745299726ce8b89670"
+checksum = "8e9b5ad5ab802e97eb8e295ac6720e509ee4c243f69d781394014ebfe8bbfa0b"
 
 [[package]]
 name = "windows_i686_gnullvm"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "87f4261229030a858f36b459e748ae97545d6f1ec60e5e0d6a3d32e0dc232ee9"
+checksum = "0eee52d38c090b3caa76c563b86c3a4bd71ef1a819287c19d586d7334ae8ed66"
 
 [[package]]
 name = "windows_i686_msvc"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "db3c2bf3d13d5b658be73463284eaf12830ac9a26a90c717b7f771dfe97487bf"
+checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
 
 [[package]]
 name = "windows_x86_64_gnu"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4e4246f76bdeff09eb48875a0fd3e2af6aada79d409d33011886d3e1581517d9"
+checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78"
 
 [[package]]
 name = "windows_x86_64_gnullvm"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "852298e482cd67c356ddd9570386e2862b5673c85bd5f88df9ab6802b334c596"
+checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
 
 [[package]]
 name = "windows_x86_64_msvc"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bec47e5bfd1bff0eeaf6d8b485cc1074891a197ab4225d504cb7a1ab88b02bf0"
+checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
diff --git a/Cargo.toml b/Cargo.toml
index a212faa..419698f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,10 +9,11 @@ parking_lot = "0.12.3"
 syslog_rpc = { version = "0.1.0", path = "../syslog/syslog_rpc" }
 vfs_rpc = { version = "0.1.0", path = "vfs_rpc" }
 
-[workspace]
-members = ["vfs_rpc"]
-
 [profile.release]
 strip = true
 lto = true
 opt-level = "s"
+
+[patch.crates-io]
+serde = { path = "../serde/serde" }
+serde_derive = { path = "../serde/serde_derive" }
diff --git a/src/main.rs b/src/main.rs
index a689d7e..9052981 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,6 +1,6 @@
 use std::{
     collections::HashMap,
-    os::mikros::{ipc, syscalls},
+    os::mikros::{ipc, syscalls, Errno},
     path::{Path, PathBuf},
 };
 
@@ -15,20 +15,20 @@ struct Serv {
 }
 
 impl vfs_rpc::Server for Serv {
-    fn register_fs(&self, from: u64, kind: &str) -> Result<(), ()> {
+    fn register_fs(&self, from: u64, kind: &str) -> Result<(), Errno> {
         self.syslog_client.send_text_message("vfs", format!("PID {} registered FS type {}", from, kind)).unwrap();
         self.fs_map.write().insert(kind.to_string(), from);
         Ok(())
     }
 
-    fn mount(&self, dev: &Path, kind: &str, path: &Path) -> Result<(), ()> {
+    fn mount(&self, dev: &Path, kind: &str, path: &Path) -> Result<(), Errno> {
         if !dev.is_absolute() {
-            return Err(());
+            return Err(Errno::EINVAL);
         }
         if !path.is_absolute() {
-            return Err(());
+            return Err(Errno::EINVAL);
         }
-        let &fs_pid = self.fs_map.read().get(kind).ok_or(())?;
+        let &fs_pid = self.fs_map.read().get(kind).ok_or(Errno::EINVAL)?;
         let mount_id = fs_rpc::Client::new(fs_pid).mount(dev)?;
         self.mount_list
             .write()
@@ -37,9 +37,9 @@ impl vfs_rpc::Server for Serv {
         Ok(())
     }
 
-    fn open(&self, path: &Path) -> Result<(u64, u64), ()> {
+    fn open(&self, path: &Path) -> Result<(u64, u64), Errno> {
         if !path.is_absolute() {
-            return Err(());
+            return Err(Errno::EINVAL);
         }
         let (mount_path, (fs_pid, mount_id)) = self
             .mount_list
@@ -58,9 +58,9 @@ impl vfs_rpc::Server for Serv {
         }
     }
 
-    fn open_dir(&self, path: &Path) -> Result<(u64, u64), ()> {
+    fn open_dir(&self, path: &Path) -> Result<(u64, u64), Errno> {
         if !path.is_absolute() {
-            return Err(());
+            return Err(Errno::EINVAL);
         }
         let (mount_path, (fs_pid, mount_id)) = self
             .mount_list
@@ -79,16 +79,16 @@ impl vfs_rpc::Server for Serv {
         }
     }
 
-    fn unmount(&self, path: &Path) -> Result<(), ()> {
+    fn unmount(&self, path: &Path) -> Result<(), Errno> {
         if self.mount_list.write().remove(path).is_none() {
-            Err(())
+            Err(Errno::EINVAL)
         } else {
             self.syslog_client.send_text_message("vfs", format!("Unmounted {}", path.display())).unwrap();
             Ok(())
         }
     }
 
-    fn set_stdio(&self, pid: u64, stdio: [Option<(u64, u64)>; 3]) -> Result<(), ()> {
+    fn set_stdio(&self, pid: u64, stdio: [Option<(u64, u64)>; 3]) -> Result<(), Errno> {
         self.process_stdio.write().insert(pid, stdio);
         Ok(())
     }
diff --git a/vfs_rpc/Cargo.lock b/vfs_rpc/Cargo.lock
index 71d7b28..e96e58b 100644
--- a/vfs_rpc/Cargo.lock
+++ b/vfs_rpc/Cargo.lock
@@ -13,15 +13,15 @@ dependencies = [
 
 [[package]]
 name = "autocfg"
-version = "1.3.0"
+version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0c4b4d0bd25bd0b74681c0ad21497610ce1b7c91b1022cd21c80c6fbdd9476b0"
+checksum = "ace50bade8e6234aa140d9a2f552bbee1db4d353f69b8217bc503490fc1a9f26"
 
 [[package]]
 name = "bitflags"
-version = "2.5.0"
+version = "2.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cf4b9d6a944f767f8e5e0db018570623c85f3d925ac718db4e06d0187adb21c1"
+checksum = "b048fb63fd8b5923fc5aa7b340d8e156aec7ec02f0c78fa8a6ddc2613f6f71de"
 
 [[package]]
 name = "byteorder"
@@ -43,9 +43,9 @@ checksum = "67ba02a97a2bd10f4b59b25c7973101c79642302776489e030cd13cdab09ed15"
 
 [[package]]
 name = "critical-section"
-version = "1.1.2"
+version = "1.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7059fff8937831a9ae6f0fe4d658ffabf58f2ca96aa9dec1c889f936f705f216"
+checksum = "f64009896348fc5af4222e9cf7d7d82a95a256c634ebcf61c53e4ea461422242"
 
 [[package]]
 name = "embedded-io"
@@ -53,6 +53,12 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ef1a6892d9eef45c8fa6b9e0086428a2cca8491aca8f787c534a3d6d0bcb3ced"
 
+[[package]]
+name = "embedded-io"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "edd0f118536f44f5ccd48bcb8b111bdc3de888b58c74639dfb034a357d0f206d"
+
 [[package]]
 name = "hash32"
 version = "0.2.1"
@@ -78,9 +84,9 @@ dependencies = [
 
 [[package]]
 name = "libc"
-version = "0.2.155"
+version = "0.2.159"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97b3888a4aecf77e811145cadf6eef5901f4782c53886191b2f693f24761847c"
+checksum = "561d97a539a36e26a9a5fad1ea11a3039a67714694aaa379433e580854bc3dc5"
 
 [[package]]
 name = "lock_api"
@@ -117,48 +123,49 @@ dependencies = [
 
 [[package]]
 name = "postcard"
-version = "1.0.8"
+version = "1.0.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a55c51ee6c0db07e68448e336cf8ea4131a620edefebf9893e759b2d793420f8"
+checksum = "5f7f0a8d620d71c457dd1d47df76bb18960378da56af4527aaa10f515eee732e"
 dependencies = [
  "cobs",
- "embedded-io",
+ "embedded-io 0.4.0",
+ "embedded-io 0.6.1",
  "heapless",
  "serde",
 ]
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.85"
+version = "1.0.86"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "22244ce15aa966053a896d1accb3a6e68469b97c7f33f284b99f0d576879fc23"
+checksum = "5e719e8df665df0d1c8fbfd238015744736151d4445ec0836b8e628aae103b77"
 dependencies = [
  "unicode-ident",
 ]
 
 [[package]]
 name = "quote"
-version = "1.0.36"
+version = "1.0.37"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0fa76aaf39101c457836aec0ce2316dbdc3ab723cdda1c6bd4e6ad4208acaca7"
+checksum = "b5b9d34b8991d19d98081b46eacdd8eb58c6f2b201139f7c5f643cc155a633af"
 dependencies = [
  "proc-macro2",
 ]
 
 [[package]]
 name = "redox_syscall"
-version = "0.5.1"
+version = "0.5.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "469052894dcb553421e483e4209ee581a45100d31b4018de03e5a7ad86374a7e"
+checksum = "9b6dfecf2c74bce2466cabf93f6664d6998a69eb21e39f4207930065b27b771f"
 dependencies = [
  "bitflags",
 ]
 
 [[package]]
 name = "rustc_version"
-version = "0.4.0"
+version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bfa0f585226d2e68097d4f95d113b15b83a82e819ab25717ec0590d9584ef366"
+checksum = "cfcb3a22ef46e85b45de6ee7e79d063319ebb6594faafcf1c225ea92ab6e9b92"
 dependencies = [
  "semver",
 ]
@@ -177,18 +184,14 @@ checksum = "61697e0a1c7e512e84a621326239844a24d8207b4669b41bc18b32ea5cbf988b"
 
 [[package]]
 name = "serde"
-version = "1.0.203"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7253ab4de971e72fb7be983802300c30b5a7f0c2e56fab8abfc6a214307c0094"
+version = "1.0.210"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.203"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "500cbc0ebeb6f46627f50f3f5811ccf6bf00643be300b4c3eabc0ef55dc5b5ba"
+version = "1.0.210"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -218,9 +221,9 @@ checksum = "a8f112729512f8e442d81f95a8a7ddf2b7c6b8a1a6f509a95864142b30cab2d3"
 
 [[package]]
 name = "syn"
-version = "2.0.66"
+version = "2.0.79"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c42f3f41a2de00b01c0aaad383c5a45241efc8b2d1eda5661812fda5f3cdcff5"
+checksum = "89132cd0bf050864e1d38dc3bbc07a0eb8e7530af26344d3d2bbbef83499f590"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -229,9 +232,9 @@ dependencies = [
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.12"
+version = "1.0.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
+checksum = "e91b56cd4cadaeb79bbf1a5645f6b4f8dc5bde8834ad5894a8db35fda9efa1fe"
 
 [[package]]
 name = "vfs_rpc"
@@ -244,9 +247,9 @@ dependencies = [
 
 [[package]]
 name = "windows-targets"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6f0713a46559409d202e70e28227288446bf7841d3211583a4b53e3f6d96e7eb"
+checksum = "9b724f72796e036ab90c1021d4780d4d3d648aca59e491e6b98e725b84e99973"
 dependencies = [
  "windows_aarch64_gnullvm",
  "windows_aarch64_msvc",
@@ -260,48 +263,48 @@ dependencies = [
 
 [[package]]
 name = "windows_aarch64_gnullvm"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7088eed71e8b8dda258ecc8bac5fb1153c5cffaf2578fc8ff5d61e23578d3263"
+checksum = "32a4622180e7a0ec044bb555404c800bc9fd9ec262ec147edd5989ccd0c02cd3"
 
 [[package]]
 name = "windows_aarch64_msvc"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9985fd1504e250c615ca5f281c3f7a6da76213ebd5ccc9561496568a2752afb6"
+checksum = "09ec2a7bb152e2252b53fa7803150007879548bc709c039df7627cabbd05d469"
 
 [[package]]
 name = "windows_i686_gnu"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "88ba073cf16d5372720ec942a8ccbf61626074c6d4dd2e745299726ce8b89670"
+checksum = "8e9b5ad5ab802e97eb8e295ac6720e509ee4c243f69d781394014ebfe8bbfa0b"
 
 [[package]]
 name = "windows_i686_gnullvm"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "87f4261229030a858f36b459e748ae97545d6f1ec60e5e0d6a3d32e0dc232ee9"
+checksum = "0eee52d38c090b3caa76c563b86c3a4bd71ef1a819287c19d586d7334ae8ed66"
 
 [[package]]
 name = "windows_i686_msvc"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "db3c2bf3d13d5b658be73463284eaf12830ac9a26a90c717b7f771dfe97487bf"
+checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
 
 [[package]]
 name = "windows_x86_64_gnu"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4e4246f76bdeff09eb48875a0fd3e2af6aada79d409d33011886d3e1581517d9"
+checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78"
 
 [[package]]
 name = "windows_x86_64_gnullvm"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "852298e482cd67c356ddd9570386e2862b5673c85bd5f88df9ab6802b334c596"
+checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
 
 [[package]]
 name = "windows_x86_64_msvc"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bec47e5bfd1bff0eeaf6d8b485cc1074891a197ab4225d504cb7a1ab88b02bf0"
+checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
diff --git a/vfs_rpc/Cargo.toml b/vfs_rpc/Cargo.toml
index ae3db6b..2f6aee2 100644
--- a/vfs_rpc/Cargo.toml
+++ b/vfs_rpc/Cargo.toml
@@ -6,4 +6,8 @@ edition = "2021"
 [dependencies]
 parking_lot = "0.12.3"
 postcard = { version = "1.0.8", features = ["use-std"] }
-serde = { version = "1.0.203" }
+serde = { path = "../../serde/serde" }
+
+[patch.crates-io]
+serde = { path = "../../serde/serde" }
+serde_derive = { path = "../../serde/serde_derive" }
diff --git a/vfs_rpc/src/lib.rs b/vfs_rpc/src/lib.rs
index b44c0fa..1d1ffdb 100644
--- a/vfs_rpc/src/lib.rs
+++ b/vfs_rpc/src/lib.rs
@@ -1,7 +1,7 @@
 #![allow(clippy::result_unit_err)]
 
 use std::{
-    os::mikros::ipc::rpc::{self, IncomingCall},
+    os::mikros::{ipc::rpc::{self, IncomingCall}, Errno},
     path::Path,
 };
 
@@ -12,13 +12,13 @@ static SERVER: RwLock<Option<Box<dyn Server>>> = RwLock::new(None);
 const PROTO: u16 = 2;
 
 pub trait Server: Send + Sync {
-    fn register_fs(&self, from: u64, kind: &str) -> Result<(), ()>;
-    fn mount(&self, dev: &Path, kind: &str, path: &Path) -> Result<(), ()>;
-    fn open(&self, path: &Path) -> Result<(u64, u64), ()>;
-    fn unmount(&self, path: &Path) -> Result<(), ()>;
-    fn set_stdio(&self, pid: u64, stdio: [Option<(u64, u64)>; 3]) -> Result<(), ()>;
+    fn register_fs(&self, from: u64, kind: &str) -> Result<(), Errno>;
+    fn mount(&self, dev: &Path, kind: &str, path: &Path) -> Result<(), Errno>;
+    fn open(&self, path: &Path) -> Result<(u64, u64), Errno>;
+    fn unmount(&self, path: &Path) -> Result<(), Errno>;
+    fn set_stdio(&self, pid: u64, stdio: [Option<(u64, u64)>; 3]) -> Result<(), Errno>;
     fn get_stdio(&self, from: u64) -> [Option<(u64, u64)>; 3];
-    fn open_dir(&self, path: &Path) -> Result<(u64, u64), ()>;
+    fn open_dir(&self, path: &Path) -> Result<(u64, u64), Errno>;
 }
 
 #[derive(Copy, Clone)]
@@ -29,14 +29,14 @@ impl Client {
         Self(pid)
     }
 
-    pub fn register_fs(self, kind: &str) -> Result<(), ()> {
+    pub fn register_fs(self, kind: &str) -> Result<(), Errno> {
         postcard::from_bytes(
             &rpc::send_call(self.0, PROTO, 0, &postcard::to_stdvec(kind).unwrap()).get_return(),
         )
         .unwrap()
     }
 
-    pub fn mount(self, dev: &Path, kind: &str, path: &Path) -> Result<(), ()> {
+    pub fn mount(self, dev: &Path, kind: &str, path: &Path) -> Result<(), Errno> {
         postcard::from_bytes(
             &rpc::send_call(
                 self.0,
@@ -49,14 +49,14 @@ impl Client {
         .unwrap()
     }
 
-    pub fn open(self, path: &Path) -> Result<(u64, u64), ()> {
+    pub fn open(self, path: &Path) -> Result<(u64, u64), Errno> {
         postcard::from_bytes(
             &rpc::send_call(self.0, PROTO, 2, &postcard::to_stdvec(path).unwrap()).get_return(),
         )
         .unwrap()
     }
 
-    pub fn unmount(self, path: &Path) -> Result<(), ()> {
+    pub fn unmount(self, path: &Path) -> Result<(), Errno> {
         postcard::from_bytes(
             &rpc::send_call(
                 self.0,
@@ -69,7 +69,7 @@ impl Client {
         .unwrap()
     }
 
-    pub fn set_stdio(&self, pid: u64, stdio: [Option<(u64, u64)>; 3]) -> Result<(), ()> {
+    pub fn set_stdio(&self, pid: u64, stdio: [Option<(u64, u64)>; 3]) -> Result<(), Errno> {
         postcard::from_bytes(
             &rpc::send_call(
                 self.0,
@@ -95,7 +95,7 @@ impl Client {
         .unwrap()
     }
 
-    pub fn open_dir(self, path: &Path) -> Result<(u64, u64), ()> {
+    pub fn open_dir(self, path: &Path) -> Result<(u64, u64), Errno> {
         postcard::from_bytes(
             &rpc::send_call(self.0, PROTO, 6, &postcard::to_stdvec(path).unwrap()).get_return(),
         )