From f348c78f97527e7a49859fa7e7ee29dd6b37dfb2 Mon Sep 17 00:00:00 2001
From: Matthew Macy <mmacy@freebsd.org>
Date: Sat, 30 Nov 2019 15:40:22 -0800
Subject: [PATCH] Mark Linux fallocate extensions as specific to Linux

fallocate(2) is a Linux-specific system call which in unavailable
on other platforms.

Reviewed-by: Jorgen Lundman <lundman@lundman.net>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Matt Macy <mmacy@FreeBSD.org>
Closes #9633
---
 lib/libzpool/kernel.c           | 4 ++++
 module/os/linux/zfs/vdev_file.c | 8 +++++---
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/lib/libzpool/kernel.c b/lib/libzpool/kernel.c
index 6123b5d6ab10..cd6553eebe07 100644
--- a/lib/libzpool/kernel.c
+++ b/lib/libzpool/kernel.c
@@ -1346,7 +1346,11 @@ zfs_file_fsync(zfs_file_t *fp, int flags)
 int
 zfs_file_fallocate(zfs_file_t *fp, int mode, loff_t offset, loff_t len)
 {
+#ifdef __linux__
 	return (fallocate(fp->f_fd, mode, offset, len));
+#else
+	return (EOPNOTSUPP);
+#endif
 }
 
 /*
diff --git a/module/os/linux/zfs/vdev_file.c b/module/os/linux/zfs/vdev_file.c
index fba5cdcedd9b..592ba2b4a5c0 100644
--- a/module/os/linux/zfs/vdev_file.c
+++ b/module/os/linux/zfs/vdev_file.c
@@ -36,9 +36,9 @@
 #include <sys/fcntl.h>
 #include <sys/vnode.h>
 #include <sys/zfs_file.h>
-
+#ifdef _KERNEL
 #include <linux/falloc.h>
-
+#endif
 /*
  * Virtual device vector for files.
  */
@@ -268,10 +268,12 @@ vdev_file_io_start(zio_t *zio)
 		zio_execute(zio);
 		return;
 	} else if (zio->io_type == ZIO_TYPE_TRIM) {
-		int mode;
+		int mode = 0;
 
 		ASSERT3U(zio->io_size, !=, 0);
+#ifdef __linux__
 		mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE;
+#endif
 		zio->io_error = zfs_file_fallocate(vf->vf_file,
 		    mode, zio->io_offset, zio->io_size);
 		zio_execute(zio);