nixpkgs: xfsprogs: don't defrag files that have <= 1 extent/512MB

nixpkgs-xfsprogs-don-t-defrag-files-that-have-1-extent-512MB.patch

From e87f3bd3cb9c3583c9f2f03391a85cfa09e50be7 Mon Sep 17 00:00:00 2001
From: Ivan Kozik <ivan@ludios.org>
Date: Sat, 1 Dec 2018 06:06:50 +0000
Subject: [PATCH] xfsprogs: don't defrag files that have <= 1 extent/512MB

---
 ...defrag-files-that-have-1-extent-512MB.patch | 18 ++++++++++++++++++
 pkgs/tools/filesystems/xfsprogs/default.nix    |  4 ++++
 2 files changed, 22 insertions(+)
 create mode 100644 pkgs/tools/filesystems/xfsprogs/0001-Don-t-defrag-files-that-have-1-extent-512MB.patch

diff --git a/pkgs/tools/filesystems/xfsprogs/0001-Don-t-defrag-files-that-have-1-extent-512MB.patch b/pkgs/tools/filesystems/xfsprogs/0001-Don-t-defrag-files-that-have-1-extent-512MB.patch
new file mode 100644
index 00000000000..ec840a659bf
--- /dev/null
+++ b/pkgs/tools/filesystems/xfsprogs/0001-Don-t-defrag-files-that-have-1-extent-512MB.patch
@@ -0,0 +1,18 @@
+diff --git a/fsr/xfs_fsr.c b/fsr/xfs_fsr.c
+index 77a10a1d..a88b5c74 100644
+--- a/fsr/xfs_fsr.c
++++ b/fsr/xfs_fsr.c
+@@ -649,6 +649,13 @@ fsrfs(char *mntdir, xfs_ino_t startino, int targetrange)
+ 				continue;
+ 			}
+ 
++			if (p->bs_extents <= (p->bs_size / (512 * 1024 * 1024))) {
++				if (dflag)
++					fsrprintf(_("<= 1 extent/512MB: "
++						"inode %llu\n"), p->bs_ino);
++				continue;
++			}
++
+ 			fd = jdm_open(fshandlep, &bs1, O_RDWR | O_DIRECT);
+ 			if (fd < 0) {
+ 				/* This probably means the file was
diff --git a/pkgs/tools/filesystems/xfsprogs/default.nix b/pkgs/tools/filesystems/xfsprogs/default.nix
index 85efb13b82e..326526a0ae9 100644
--- a/pkgs/tools/filesystems/xfsprogs/default.nix
+++ b/pkgs/tools/filesystems/xfsprogs/default.nix
@@ -23,6 +23,10 @@ stdenv.mkDerivation rec {
 
   enableParallelBuilding = true;
 
+  patches = [
+    ./0001-Don-t-defrag-files-that-have-1-extent-512MB.patch
+  ];
+
   # @sbindir@ is replaced with /run/current-system/sw/bin to fix dependency cycles
   preConfigure = ''
     for file in scrub/{xfs_scrub_all.cron.in,xfs_scrub@.service.in,xfs_scrub_all.service.in}; do
-- 
2.31.0