fix(mm): 修复fat文件系统的PageCache同步问题

kernel/src/driver/net/dma.rs

@@ -3,7 +3,7 @@ use crate::arch::mm::kernel_page_flags;
 use crate::arch::MMArch;
 
 use crate::mm::kernel_mapper::KernelMapper;
-use crate::mm::page::{page_manager_lock_irqsave, EntryFlags};
+use crate::mm::page::EntryFlags;
 use crate::mm::{
     allocator::page_frame::{
         allocate_page_frames, deallocate_page_frames, PageFrameCount, PhysPageFrame,
@@ -61,11 +61,7 @@ pub unsafe fn dma_dealloc(paddr: usize, vaddr: NonNull<u8>, pages: usize) -> i32
     flusher.flush();
 
     unsafe {
-        deallocate_page_frames(
-            PhysPageFrame::new(PhysAddr::new(paddr)),
-            page_count,
-            &mut page_manager_lock_irqsave(),
-        );
+        deallocate_page_frames(PhysPageFrame::new(PhysAddr::new(paddr)), page_count);
     }
     return 0;
 }

kernel/src/driver/virtio/virtio_impl.rs

@@ -3,7 +3,7 @@ use crate::arch::mm::kernel_page_flags;
 use crate::arch::MMArch;
 
 use crate::mm::kernel_mapper::KernelMapper;
-use crate::mm::page::{page_manager_lock_irqsave, EntryFlags};
+use crate::mm::page::EntryFlags;
 use crate::mm::{
     allocator::page_frame::{
         allocate_page_frames, deallocate_page_frames, PageFrameCount, PhysPageFrame,
@@ -72,11 +72,7 @@ unsafe impl Hal for HalImpl {
         flusher.flush();
 
         unsafe {
-            deallocate_page_frames(
-                PhysPageFrame::new(PhysAddr::new(paddr)),
-                page_count,
-                &mut page_manager_lock_irqsave(),
-            );
+            deallocate_page_frames(PhysPageFrame::new(PhysAddr::new(paddr)), page_count);
         }
         return 0;
     }

kernel/src/filesystem/fat/fs.rs

@@ -129,9 +129,8 @@ pub struct FATInode {
 }
 
 impl FATInode {
-    /// @brief 更新当前inode的元数据
-    pub fn update_metadata(&mut self) {
-        // todo: 更新文件的访问时间等信息
+    /// 将inode的元数据与磁盘同步
+    pub fn synchronize_metadata(&mut self) {
         match &self.inode_type {
             FATDirEntry::File(f) | FATDirEntry::VolId(f) => {
                 self.metadata.size = f.size() as i64;
@@ -146,6 +145,19 @@ impl FATInode {
         };
     }
 
+    /// 更新inode的元数据
+    pub fn update_metadata(&mut self, size: Option<i64>) {
+        if let Some(new_size) = size {
+            self.metadata.size = new_size;
+        }
+        self.update_time();
+    }
+
+    /// 更新访问时间
+    pub fn update_time(&mut self) {
+        log::warn!("update_time has not yet been implemented");
+    }
+
     fn find(&mut self, name: &str) -> Result<Arc<LockedFATInode>, SystemError> {
         match &self.inode_type {
             FATDirEntry::Dir(d) => {
@@ -234,7 +246,7 @@ impl LockedFATInode {
 
         inode.0.lock().self_ref = Arc::downgrade(&inode);
 
-        inode.0.lock().update_metadata();
+        inode.0.lock().synchronize_metadata();
 
         return inode;
     }
@@ -1386,24 +1398,14 @@ impl FATFsInfo {
 }
 
 impl IndexNode for LockedFATInode {
-    fn read_at(
-        &self,
-        offset: usize,
-        len: usize,
-        buf: &mut [u8],
-        _data: SpinLockGuard<FilePrivateData>,
-    ) -> Result<usize, SystemError> {
-        let mut guard: SpinLockGuard<FATInode> = self.0.lock();
+    fn read_sync(&self, offset: usize, buf: &mut [u8]) -> Result<usize, SystemError> {
+        let guard: SpinLockGuard<FATInode> = self.0.lock();
         match &guard.inode_type {
             FATDirEntry::File(f) | FATDirEntry::VolId(f) => {
-                let r = f.read(
-                    &guard.fs.upgrade().unwrap(),
-                    &mut buf[0..len],
-                    offset as u64,
-                );
-                guard.update_metadata();
+                let r = f.read(&guard.fs.upgrade().unwrap(), buf, offset as u64);
                 return r;
             }
+
             FATDirEntry::Dir(_) => {
                 return Err(SystemError::EISDIR);
             }
@@ -1414,32 +1416,95 @@ impl IndexNode for LockedFATInode {
         }
     }
 
-    fn write_at(
-        &self,
-        offset: usize,
-        len: usize,
-        buf: &[u8],
-        _data: SpinLockGuard<FilePrivateData>,
-    ) -> Result<usize, SystemError> {
+    fn write_sync(&self, offset: usize, buf: &[u8]) -> Result<usize, SystemError> {
         let mut guard: SpinLockGuard<FATInode> = self.0.lock();
         let fs: &Arc<FATFileSystem> = &guard.fs.upgrade().unwrap();
 
         match &mut guard.inode_type {
             FATDirEntry::File(f) | FATDirEntry::VolId(f) => {
-                let r = f.write(fs, &buf[0..len], offset as u64);
-                guard.update_metadata();
+                let r = f.write(fs, buf, offset as u64);
                 return r;
             }
+
             FATDirEntry::Dir(_) => {
                 return Err(SystemError::EISDIR);
             }
+
             FATDirEntry::UnInit => {
                 error!("FATFS: param: Inode_type uninitialized.");
                 return Err(SystemError::EROFS);
             }
         }
     }
 
+    fn read_at(
+        &self,
+        offset: usize,
+        len: usize,
+        buf: &mut [u8],
+        data: SpinLockGuard<FilePrivateData>,
+    ) -> Result<usize, SystemError> {
+        let len = core::cmp::min(len, buf.len());
+        let buf = &mut buf[0..len];
+
+        let page_cache = self.0.lock().page_cache.clone();
+        if let Some(page_cache) = page_cache {
+            let r = page_cache.read(offset, &mut buf[0..len]);
+            // self.0.lock_irqsave().update_metadata();
+            return r;
+        } else {
+            return self.read_direct(offset, len, buf, data);
+        }
+    }
+
+    fn write_at(
+        &self,
+        offset: usize,
+        len: usize,
+        buf: &[u8],
+        data: SpinLockGuard<FilePrivateData>,
+    ) -> Result<usize, SystemError> {
+        let len = core::cmp::min(len, buf.len());
+        let buf = &buf[0..len];
+
+        let page_cache = self.0.lock().page_cache.clone();
+        if let Some(page_cache) = page_cache {
+            let write_len = page_cache.write(offset, buf)?;
+            let mut guard = self.0.lock();
+            let old_size = guard.metadata.size;
+            guard.update_metadata(Some(core::cmp::max(old_size, (offset + write_len) as i64)));
+            return Ok(write_len);
+        } else {
+            return self.write_direct(offset, len, buf, data);
+        }
+    }
+
+    fn read_direct(
+        &self,
+        offset: usize,
+        len: usize,
+        buf: &mut [u8],
+        _data: SpinLockGuard<FilePrivateData>,
+    ) -> Result<usize, SystemError> {
+        let len = core::cmp::min(len, buf.len());
+        let r = self.read_sync(offset, &mut buf[0..len]);
+        // self.0.lock_irqsave().update_metadata();
+        return r;
+    }
+
+    fn write_direct(
+        &self,
+        offset: usize,
+        len: usize,
+        buf: &[u8],
+        _data: SpinLockGuard<FilePrivateData>,
+    ) -> Result<usize, SystemError> {
+        let len = core::cmp::min(len, buf.len());
+        let r = self.write_sync(offset, &buf[0..len]);
+        // self.0.lock_irqsave().update_metadata();
+        return r;
+    }
+
     fn create(
         &self,
         name: &str,
@@ -1496,6 +1561,10 @@ impl IndexNode for LockedFATInode {
         Ok(())
     }
     fn resize(&self, len: usize) -> Result<(), SystemError> {
+        if let Some(page_cache) = self.page_cache() {
+            return page_cache.resize(len);
+        }
+
         let mut guard: SpinLockGuard<FATInode> = self.0.lock();
         let fs: &Arc<FATFileSystem> = &guard.fs.upgrade().unwrap();
         let old_size = guard.metadata.size as usize;
@@ -1527,7 +1596,7 @@ impl IndexNode for LockedFATInode {
                         file.truncate(fs, len as u64)?;
                     }
                 }
-                guard.update_metadata();
+                guard.synchronize_metadata();
                 return Ok(());
             }
             FATDirEntry::Dir(_) => return Err(SystemError::ENOSYS),