Move `Pipe` from `InodeImpl` to `Inode`

kernel/src/fs/ext2/impl_for_vfs/inode.rs

@@ -148,7 +148,11 @@ impl Inode for Ext2Inode {
 
                 Some(device.open())
             }
-            InodeType::NamedPipe => Some(self.open_named_pipe(access_mode, status_flags)),
+            InodeType::NamedPipe => {
+                let pipe = self.named_pipe().unwrap();
+
+                Some(pipe.open_named(access_mode, status_flags))
+            }
             _ => None,
         }
     }

kernel/src/fs/ext2/inode.rs

@@ -20,12 +20,11 @@ use super::{
 };
 use crate::{
     fs::{
-        inode_handle::FileIo,
         path::{is_dot, is_dot_or_dotdot, is_dotdot},
         pipe::Pipe,
         utils::{
-            AccessMode, Extension, FallocMode, Inode as _, InodeMode, Metadata, Permission,
+            Extension, FallocMode, Inode as _, InodeMode, Metadata, Permission, XattrName,
-            StatusFlags, XattrName, XattrNamespace, XattrSetFlags,
+            XattrNamespace, XattrSetFlags,
         },
     },
     process::{Gid, Uid, posix_thread::AsPosixThread},
@@ -41,6 +40,9 @@ pub const MAX_FAST_SYMLINK_LEN: usize = MAX_BLOCK_PTRS * BID_SIZE;
 pub struct Inode {
     ino: u32,
     type_: InodeType,
+    // This corresponds to the `i_pipe` field in `struct inode` in Linux.
+    // Reference: <https://elixir.bootlin.com/linux/v6.17/source/include/linux/fs.h#L771>.
+    named_pipe: Option<Box<Pipe>>,
     block_group_idx: usize,
     inner: RwMutex<InodeInner>,
     fs: Weak<Ext2>,
@@ -58,6 +60,11 @@ impl Inode {
         Arc::new_cyclic(|weak_self| Self {
             ino,
             type_: desc.type_,
+            named_pipe: if desc.type_ == InodeType::NamedPipe {
+                Some(Box::new(Pipe::new()))
+            } else {
+                None
+            },
             block_group_idx,
             xattr: desc
                 .acl
@@ -76,6 +83,10 @@ impl Inode {
         self.type_
     }
 
+    pub(super) fn named_pipe(&self) -> Option<&Pipe> {
+        self.named_pipe.as_deref()
+    }
+
     pub(super) fn block_group_idx(&self) -> usize {
         self.block_group_idx
     }
@@ -683,16 +694,6 @@ impl Inode {
         inner.device_id()
     }
 
-    pub(super) fn open_named_pipe(
-        &self,
-        access_mode: AccessMode,
-        status_flags: StatusFlags,
-    ) -> Result<Box<dyn FileIo>> {
-        let inner = self.inner.read();
-        let named_pipe = inner.named_pipe.as_ref().unwrap();
-        named_pipe.open_named(access_mode, status_flags)
-    }
-
     pub fn read_at(&self, offset: usize, writer: &mut VmWriter) -> Result<usize> {
         if self.type_ != InodeType::File {
             return_errno!(Errno::EISDIR);
@@ -965,19 +966,11 @@ fn write_lock_multiple_inodes(inodes: Vec<&Inode>) -> Vec<RwMutexWriteGuard<'_,
 struct InodeInner {
     inode_impl: InodeImpl,
     page_cache: PageCache,
-    // This corresponds to the `i_pipe` field in `struct inode` in Linux.
-    // Reference: <https://elixir.bootlin.com/linux/v6.17/source/include/linux/fs.h#L771>.
-    named_pipe: Option<Pipe>,
 }
 
 impl InodeInner {
     pub fn new(desc: Dirty<InodeDesc>, weak_self: Weak<Inode>, fs: Weak<Ext2>) -> Self {
         let num_page_bytes = desc.num_page_bytes();
-        let named_pipe = if desc.type_ == InodeType::NamedPipe {
-            Some(Pipe::new())
-        } else {
-            None
-        };
         let inode_impl = InodeImpl::new(desc, weak_self, fs);
         Self {
             page_cache: PageCache::with_capacity(
@@ -986,7 +979,6 @@ impl InodeInner {
             )
             .unwrap(),
             inode_impl,
-            named_pipe,
         }
     }
 

test/src/syscall/gvisor/blocklists.ext2/pipe_test

@@ -1,2 +1,4 @@
-# TODO: Support pipe file in ext2 filesystem.
+# Nothing here. Pipe files are supported by the ext2 file system.
-*
+#
+# This file is kept to ensure that the `blocklists.ext2` directory
+# is not empty, as it may become useful in the future.