From 0010a9227eef21cdde39f1a14ce38b934db5de80 Mon Sep 17 00:00:00 2001
From: antiochp <30642645+antiochp@users.noreply.github.com>
Date: Mon, 12 Nov 2018 13:54:38 +0000
Subject: [PATCH 1/2] replace ftruncate/ftruncate64 with a simple set_len()
 call

---
 store/src/types.rs | 30 ++++++++++++------------------
 1 file changed, 12 insertions(+), 18 deletions(-)

diff --git a/store/src/types.rs b/store/src/types.rs
index 65473e193..e1a3bcb99 100644
--- a/store/src/types.rs
+++ b/store/src/types.rs
@@ -17,14 +17,8 @@ use memmap;
 use std::cmp;
 use std::fs::{self, File, OpenOptions};
 use std::io::{self, BufRead, BufReader, BufWriter, ErrorKind, Read, Write};
-use std::os::unix::io::AsRawFd;
 use std::path::Path;
 
-#[cfg(not(any(target_os = "linux", target_os = "android")))]
-use libc::{ftruncate as ftruncate64, off_t as off64_t};
-#[cfg(any(target_os = "linux"))]
-use libc::{ftruncate64, off64_t};
-
 use core::core::hash::Hash;
 use core::ser::{self, FixedLength};
 
@@ -189,8 +183,8 @@ impl AppendOnlyFile {
 	/// written data accessible.
 	pub fn flush(&mut self) -> io::Result<()> {
 		if self.buffer_start_bak > 0 {
-			// flushing a rewound state, we need to truncate before applying
-			self.truncate(self.buffer_start)?;
+			// Flushing a rewound state, we need to truncate via set_len() before applying.
+			self.file.set_len(self.buffer_start as u64)?;
 			self.buffer_start_bak = 0;
 		}
 
@@ -256,16 +250,16 @@ impl AppendOnlyFile {
 		}
 	}
 
-	/// Truncates the underlying file to the provided offset
-	pub fn truncate(&self, offs: usize) -> io::Result<()> {
-		let fd = self.file.as_raw_fd();
-		let res = unsafe { ftruncate64(fd, offs as off64_t) };
-		if res == -1 {
-			Err(io::Error::last_os_error())
-		} else {
-			Ok(())
-		}
-	}
+	// /// Truncates the underlying file to the provided offset
+	// pub fn truncate(&self, offs: usize) -> io::Result<()> {
+	// 	let fd = self.file.as_raw_fd();
+	// 	let res = unsafe { ftruncate64(fd, offs as off64_t) };
+	// 	if res == -1 {
+	// 		Err(io::Error::last_os_error())
+	// 	} else {
+	// 		Ok(())
+	// 	}
+	// }
 
 	/// Saves a copy of the current file content, skipping data at the provided
 	/// prune indices. The prune Vec must be ordered.

From f820b3675dbfb8bab00f237e50065e274939e7e9 Mon Sep 17 00:00:00 2001
From: antiochp <30642645+antiochp@users.noreply.github.com>
Date: Mon, 12 Nov 2018 13:59:22 +0000
Subject: [PATCH 2/2] cleanup

---
 store/src/types.rs | 11 -----------
 1 file changed, 11 deletions(-)

diff --git a/store/src/types.rs b/store/src/types.rs
index e1a3bcb99..442e52709 100644
--- a/store/src/types.rs
+++ b/store/src/types.rs
@@ -250,17 +250,6 @@ impl AppendOnlyFile {
 		}
 	}
 
-	// /// Truncates the underlying file to the provided offset
-	// pub fn truncate(&self, offs: usize) -> io::Result<()> {
-	// 	let fd = self.file.as_raw_fd();
-	// 	let res = unsafe { ftruncate64(fd, offs as off64_t) };
-	// 	if res == -1 {
-	// 		Err(io::Error::last_os_error())
-	// 	} else {
-	// 		Ok(())
-	// 	}
-	// }
-
 	/// Saves a copy of the current file content, skipping data at the provided
 	/// prune indices. The prune Vec must be ordered.
 	pub fn save_prune<T>(