Use the default poll implementation of INode

deps/sefs

@@ -1 +1 @@
-Subproject commit a771d5d37f2a21b02ee579bab85dc8e551d924e0
+Subproject commit a87fbb19e621d78413e2ee2af38d97b086e329b4

src/libos/src/fs/dev_fs/dev_fd.rs

@@ -15,14 +15,6 @@ impl INode for DevFd {
         Err(vfs::FsError::PermError)
     }
 
-    fn poll(&self) -> vfs::Result<vfs::PollStatus> {
-        Ok(vfs::PollStatus {
-            read: true,
-            write: true,
-            error: false,
-        })
-    }
-
     fn metadata(&self) -> vfs::Result<Metadata> {
         Ok(Metadata {
             dev: 1,

src/libos/src/fs/dev_fs/dev_null.rs

@@ -12,14 +12,6 @@ impl INode for DevNull {
         Ok(buf.len())
     }
 
-    fn poll(&self) -> vfs::Result<vfs::PollStatus> {
-        Ok(vfs::PollStatus {
-            read: true,
-            write: true,
-            error: false,
-        })
-    }
-
     fn metadata(&self) -> vfs::Result<Metadata> {
         Ok(Metadata {
             dev: 1,

src/libos/src/fs/dev_fs/dev_sgx/mod.rs

@@ -24,10 +24,6 @@ impl INode for DevSgx {
         Err(FsError::PermError)
     }
 
-    fn poll(&self) -> vfs::Result<vfs::PollStatus> {
-        Err(FsError::PermError)
-    }
-
     fn metadata(&self) -> vfs::Result<Metadata> {
         Ok(Metadata {
             dev: 1,

src/libos/src/fs/dev_fs/dev_shm.rs

@@ -12,10 +12,6 @@ impl INode for DevShm {
         Err(vfs::FsError::NotFile)
     }
 
-    fn poll(&self) -> vfs::Result<vfs::PollStatus> {
-        Err(vfs::FsError::NotFile)
-    }
-
     fn metadata(&self) -> vfs::Result<Metadata> {
         Ok(Metadata {
             dev: 0,

src/libos/src/fs/dev_fs/dev_zero.rs

@@ -15,14 +15,6 @@ impl INode for DevZero {
         Ok(buf.len())
     }
 
-    fn poll(&self) -> vfs::Result<vfs::PollStatus> {
-        Ok(vfs::PollStatus {
-            read: true,
-            write: true,
-            error: false,
-        })
-    }
-
     fn metadata(&self) -> vfs::Result<Metadata> {
         Ok(Metadata {
             dev: 1,

src/libos/src/fs/hostfs.rs

@@ -98,20 +98,6 @@ impl INode for HNode {
         Ok(len)
     }
 
-    fn poll(&self) -> Result<PollStatus> {
-        if !self.is_file() {
-            return Err(FsError::NotFile);
-        }
-        let guard = self.open_file()?;
-        let file = guard.as_ref().unwrap();
-        let metadata = try_std!(file.metadata());
-        Ok(PollStatus {
-            read: true,
-            write: !metadata.permissions().readonly(),
-            error: false,
-        })
-    }
-
     fn metadata(&self) -> Result<Metadata> {
         let metadata = if self.is_file() {
             let guard = self.open_file()?;

src/libos/src/fs/procfs/proc_inode/dir.rs

@@ -26,10 +26,6 @@ where
         Err(vfs::FsError::NotFile)
     }
 
-    fn poll(&self) -> vfs::Result<vfs::PollStatus> {
-        Err(vfs::FsError::NotFile)
-    }
-
     fn metadata(&self) -> vfs::Result<Metadata> {
         Ok(Metadata {
             dev: 0,

src/libos/src/fs/procfs/proc_inode/file.rs

@@ -18,14 +18,6 @@ impl<T> INode for File<T>
 where
     T: ProcINode + Sync + Send + 'static,
 {
-    fn poll(&self) -> vfs::Result<vfs::PollStatus> {
-        Ok(vfs::PollStatus {
-            read: true,
-            write: false,
-            error: false,
-        })
-    }
-
     fn metadata(&self) -> vfs::Result<Metadata> {
         Ok(Metadata {
             dev: 0,

src/libos/src/fs/procfs/proc_inode/symlink.rs

@@ -18,10 +18,6 @@ impl<T> INode for SymLink<T>
 where
     T: ProcINode + Sync + Send + 'static,
 {
-    fn poll(&self) -> vfs::Result<vfs::PollStatus> {
-        Err(vfs::FsError::NotFile)
-    }
-
     fn metadata(&self) -> vfs::Result<Metadata> {
         Ok(Metadata {
             dev: 0,