fix clippy

Signed-off-by: Yuchen Liang <yuchen@neon.tech>

pageserver/src/page_cache.rs

@@ -651,9 +651,9 @@ impl PageCache {
         size_metrics.current_bytes_immutable.set_page_sz(0);
 
         let slots = page_buffer
-            // Each chunk has `PAGE_SZ` (8192) bytes, greater than 512, still aligned.
             .chunks_exact_mut(PAGE_SZ)
             .map(|chunk| {
+                // SAFETY: Each chunk has `PAGE_SZ` (8192) bytes, greater than 512, still aligned.
                 let buf = unsafe { IoPageSlice::new_unchecked(chunk.try_into().unwrap()) };
 
                 Slot {

pageserver/src/virtual_file.rs

@@ -1366,7 +1366,6 @@ pub(crate) type IoBufferMut = aligned_buffer::AlignedBufferMut<{ get_io_buffer_a
 pub(crate) type IoPageSlice<'a> =
     aligned_buffer::AlignedSlice<'a, { get_io_buffer_alignment() }, PAGE_SZ>;
 
-
 static IO_MODE: AtomicU8 = AtomicU8::new(IoMode::preferred() as u8);
 
 pub(crate) fn set_io_mode(mode: IoMode) {
@@ -1715,7 +1714,7 @@ mod tests {
                         .await
                         .unwrap()
                         .into_inner();
-                    assert!(&buf[..] == SAMPLE);
+                    assert!(buf[..] == SAMPLE);
                 }
             });
             hdls.push(hdl);

pageserver/src/virtual_file/aligned_buffer.rs

@@ -49,7 +49,7 @@ impl<'a, const ALIGN: usize, const N: usize> DerefMut for AlignedSlice<'a, ALIGN
 
 impl<'a, const ALIGN: usize, const N: usize> AsRef<[u8; N]> for AlignedSlice<'a, ALIGN, N> {
     fn as_ref(&self) -> &[u8; N] {
-        &self.0
+        self.0
     }
 }
 

pageserver/src/virtual_file/owned_buffers_io/io_buf_aligned.rs

@@ -8,4 +8,4 @@ pub trait IoBufAlignedMut: IoBufMut {}
 
 impl IoBufAlignedMut for IoBufferMut {}
 
-impl<'a> IoBufAlignedMut for PageWriteGuardBuf {}
+impl IoBufAlignedMut for PageWriteGuardBuf {}