From e41ad3be0fb72c0e83bca01def6bf68537c7dfac Mon Sep 17 00:00:00 2001
From: Dmitry Rodionov <dmitry@zenith.tech>
Date: Wed, 20 Apr 2022 16:21:43 +0300
Subject: [PATCH] add more context to writeback error

---
 pageserver/src/layered_repository/ephemeral_file.rs | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/pageserver/src/layered_repository/ephemeral_file.rs b/pageserver/src/layered_repository/ephemeral_file.rs
index 060d44f810..a2f8cda461 100644
--- a/pageserver/src/layered_repository/ephemeral_file.rs
+++ b/pageserver/src/layered_repository/ephemeral_file.rs
@@ -259,8 +259,17 @@ impl Drop for EphemeralFile {
 
 pub fn writeback(file_id: u64, blkno: u32, buf: &[u8]) -> Result<(), std::io::Error> {
     if let Some(file) = EPHEMERAL_FILES.read().unwrap().files.get(&file_id) {
-        file.write_all_at(buf, blkno as u64 * PAGE_SZ as u64)?;
-        Ok(())
+        match file.write_all_at(buf, blkno as u64 * PAGE_SZ as u64) {
+            Ok(_) => Ok(()),
+            Err(e) => Err(std::io::Error::new(
+                ErrorKind::Other,
+                format!(
+                    "failed to write back to ephemeral file at {} error: {}",
+                    file.path.display(),
+                    e
+                ),
+            )),
+        }
     } else {
         Err(std::io::Error::new(
             ErrorKind::Other,