feat(filesystem): 引入Umount系统调用 (#719)

* feat(filesystem): 引入Umount系统调用

* 将所有ENOSYS误用更正

* 修复了一个使同一个挂载点可以挂载2个文件系统的bug

* 统一注释，增强程序稳定性，统一接口。注意：Umount时在fatfs的路径要使用大写，此受限于当前文件系统设计。

kernel/src/driver/acpi/sysfs.rs

@@ -205,11 +205,11 @@ impl AttrAcpiTable {
 
 impl Attribute for AttrAcpiTable {
     fn show(&self, _kobj: Arc<dyn KObject>, _buf: &mut [u8]) -> Result<usize, SystemError> {
-        return Err(SystemError::EOPNOTSUPP_OR_ENOTSUP);
+        return Err(SystemError::ENOSYS);
     }
 
     fn store(&self, _kobj: Arc<dyn KObject>, _buf: &[u8]) -> Result<usize, SystemError> {
-        return Err(SystemError::EOPNOTSUPP_OR_ENOTSUP);
+        return Err(SystemError::ENOSYS);
     }
 
     fn name(&self) -> &str {
@@ -235,7 +235,7 @@ impl BinAttribute for AttrAcpiTable {
         _buf: &[u8],
         _offset: usize,
     ) -> Result<usize, SystemError> {
-        return Err(SystemError::EOPNOTSUPP_OR_ENOTSUP);
+        return Err(SystemError::ENOSYS);
     }
 
     /// 展示 ACPI 表的内容

kernel/src/driver/base/device/bus.rs

@@ -134,9 +134,9 @@ pub trait Bus: Debug + Send + Sync {
     ///
     /// ## 默认实现
     ///
-    /// 如果总线不支持该操作，返回`SystemError::EOPNOTSUPP_OR_ENOTSUP`
+    /// 如果总线不支持该操作，返回`SystemError::ENOSYS`
     fn probe(&self, _device: &Arc<dyn Device>) -> Result<(), SystemError> {
-        return Err(SystemError::EOPNOTSUPP_OR_ENOTSUP);
+        return Err(SystemError::ENOSYS);
     }
     fn remove(&self, _device: &Arc<dyn Device>) -> Result<(), SystemError>;
     fn sync_state(&self, _device: &Arc<dyn Device>) {}
@@ -750,7 +750,7 @@ impl Attribute for DriverAttrUnbind {
                 "Intertrait casting not implemented for kobj: {}",
                 kobj.name()
             );
-            SystemError::EOPNOTSUPP_OR_ENOTSUP
+            SystemError::ENOSYS
         })?;
 
         let bus = driver
@@ -799,7 +799,7 @@ impl Attribute for DriverAttrBind {
                 "Intertrait casting not implemented for kobj: {}",
                 kobj.name()
             );
-            SystemError::EOPNOTSUPP_OR_ENOTSUP
+            SystemError::ENOSYS
         })?;
 
         let bus = driver

kernel/src/driver/base/device/dd.rs

@@ -502,7 +502,7 @@ impl DriverManager {
             .and_then(|bus| bus.upgrade())
             .ok_or(SystemError::EINVAL)?;
         let r = bus.probe(device);
-        if r == Err(SystemError::EOPNOTSUPP_OR_ENOTSUP) {
+        if r == Err(SystemError::ENOSYS) {
             kerror!(
                 "call_driver_probe: bus.probe() failed, dev: '{}', err: {:?}",
                 device.name(),
@@ -592,7 +592,7 @@ impl Attribute for DeviceAttrStateSynced {
                 "Intertrait casting not implemented for kobj: {}",
                 kobj.name()
             );
-            SystemError::EOPNOTSUPP_OR_ENOTSUP
+            SystemError::ENOSYS
         })?;
 
         let val = dev.state_synced();
@@ -627,7 +627,7 @@ impl Attribute for DeviceAttrCoredump {
                 "Intertrait casting not implemented for kobj: {}",
                 kobj.name()
             );
-            SystemError::EOPNOTSUPP_OR_ENOTSUP
+            SystemError::ENOSYS
         })?;
 
         let drv = dev.driver().ok_or(SystemError::EINVAL)?;

kernel/src/driver/base/device/mod.rs

@@ -875,7 +875,7 @@ impl Attribute for DeviceAttrDev {
                 "Intertrait casting not implemented for kobj: {}",
                 kobj.name()
             );
-            SystemError::EOPNOTSUPP_OR_ENOTSUP
+            SystemError::ENOSYS
         })?;
 
         let device_number = dev.id_table().device_number();

kernel/src/driver/base/kobject.rs

@@ -146,7 +146,7 @@ impl SysFSOps for KObjectSysFSOps {
         buf: &mut [u8],
     ) -> Result<usize, SystemError> {
         let r = attr.show(kobj, buf).map_err(|e| {
-            if e == SystemError::EOPNOTSUPP_OR_ENOTSUP {
+            if e == SystemError::ENOSYS {
                 SystemError::EIO
             } else {
                 e
@@ -163,7 +163,7 @@ impl SysFSOps for KObjectSysFSOps {
         buf: &[u8],
     ) -> Result<usize, SystemError> {
         let r = attr.store(kobj, buf).map_err(|e| {
-            if e == SystemError::EOPNOTSUPP_OR_ENOTSUP {
+            if e == SystemError::ENOSYS {
                 SystemError::EIO
             } else {
                 e

kernel/src/driver/base/subsys.rs

@@ -201,7 +201,7 @@ pub trait SubSysInterface: Debug + Send + Sync {
     fn bus(&self) -> Option<Weak<dyn Bus>>;
     fn set_bus(&self, bus: Option<Weak<dyn Bus>>);
     fn add_device(&self, _device: &Arc<dyn Device>) -> Result<(), SystemError> {
-        return Err(SystemError::EOPNOTSUPP_OR_ENOTSUP);
+        return Err(SystemError::ENOSYS);
     }
     fn remove_device(&self, device: &Arc<dyn Device>);
 }

kernel/src/driver/disk/ahci/ahci_inode.rs

@@ -82,11 +82,11 @@ impl IndexNode for LockedAhciInode {
         _data: SpinLockGuard<FilePrivateData>,
         _mode: &FileMode,
     ) -> Result<(), SystemError> {
-        Err(SystemError::EOPNOTSUPP_OR_ENOTSUP)
+        Err(SystemError::ENOSYS)
     }
 
     fn close(&self, _data: SpinLockGuard<FilePrivateData>) -> Result<(), SystemError> {
-        Err(SystemError::EOPNOTSUPP_OR_ENOTSUP)
+        Err(SystemError::ENOSYS)
     }
 
     fn metadata(&self) -> Result<Metadata, SystemError> {
@@ -98,7 +98,7 @@ impl IndexNode for LockedAhciInode {
     }
 
     fn list(&self) -> Result<Vec<String>, SystemError> {
-        Err(SystemError::EOPNOTSUPP_OR_ENOTSUP)
+        Err(SystemError::ENOSYS)
     }
 
     fn set_metadata(&self, metadata: &Metadata) -> Result<(), SystemError> {

kernel/src/driver/input/ps2_mouse/ps_mouse_device.rs

@@ -30,8 +30,8 @@ use crate::{
         devfs::{devfs_register, DevFS, DeviceINode},
         kernfs::KernFSInode,
         vfs::{
-            core::generate_inode_id, syscall::ModeType, FilePrivateData, FileSystem, FileType,
-            IndexNode, Metadata,
+            core::generate_inode_id, syscall::ModeType, utils::DName, FilePrivateData, FileSystem,
+            FileType, IndexNode, Metadata,
         },
     },
     libs::{
@@ -627,7 +627,7 @@ impl IndexNode for Ps2MouseDevice {
         _buf: &[u8],
         _data: SpinLockGuard<FilePrivateData>,
     ) -> Result<usize, SystemError> {
-        return Err(SystemError::EOPNOTSUPP_OR_ENOTSUP);
+        return Err(SystemError::ENOSYS);
     }
 
     fn fs(&self) -> Arc<dyn FileSystem> {
@@ -655,6 +655,10 @@ impl IndexNode for Ps2MouseDevice {
     fn resize(&self, _len: usize) -> Result<(), SystemError> {
         Ok(())
     }
+
+    fn dname(&self) -> Result<DName, SystemError> {
+        Ok(DName::from(self.name()))
+    }
 }
 
 impl Ps2Device for Ps2MouseDevice {}

kernel/src/driver/keyboard/ps2_keyboard.rs

@@ -171,7 +171,7 @@ impl IndexNode for LockedPS2KeyBoardInode {
     }
 
     fn list(&self) -> Result<alloc::vec::Vec<alloc::string::String>, SystemError> {
-        return Err(SystemError::EOPNOTSUPP_OR_ENOTSUP);
+        return Err(SystemError::ENOSYS);
     }
 }