From 8e83c0cf68119920355307cbead6f017d1e937ea Mon Sep 17 00:00:00 2001
From: Li Dongyang <dongyangli@ddn.com>
Date: Tue, 29 Aug 2023 15:18:34 +1000
Subject: [PATCH] LU-17042 target: allow fsmap ioctl

Pass through the FS_IOC_GETFSMAP ioctl to the underlying ldiskfs
so e2freefrag can make use of online query.

Change-Id: Ia4f1fd3c0b02429b247fa71e73b4a95b98b47026
Test-Parameters: trivial
Signed-off-by: Li Dongyang <dongyangli@ddn.com>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/52147
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
---
 lustre/autoconf/lustre-core.m4 | 18 ++++++++++++++++++
 lustre/target/tgt_mount.c      |  7 +++++++
 2 files changed, 25 insertions(+)

diff --git a/lustre/autoconf/lustre-core.m4 b/lustre/autoconf/lustre-core.m4
index af32b5f..dbc7b32 100644
--- a/lustre/autoconf/lustre-core.m4
+++ b/lustre/autoconf/lustre-core.m4
@@ -2304,6 +2304,22 @@ AC_DEFUN([LC_HAVE_CRYPTO_MAX_ALG_NAME_128], [
 ]) # LC_HAVE_CRYPTO_MAX_ALG_NAME_128
 
 #
+# LC_HAVE_FSMAP_HEADER
+#
+# Kernel version 4.11-rc4 commit 80c9f490f344be7999f57fc31a8ed956f8c65f3b
+# vfs: add common GETFSMAP ioctl definitions
+#
+AC_DEFUN([LC_SRC_HAVE_FSMAP_HEADER], [
+	LB2_CHECK_LINUX_HEADER_SRC([linux/fsmap.h], [-Werror])
+])
+AC_DEFUN([LC_HAVE_FSMAP_HEADER], [
+	LB2_CHECK_LINUX_HEADER_RESULT([linux/fsmap.h], [
+		AC_DEFINE(HAVE_FSMAP_H, 1,
+			[fsmap.h is present])
+	])
+]) # LC_HAVE_FSMAP_HEADER
+
+#
 # Kernel version 4.12 commit 47f38c539e9a42344ff5a664942075bd4df93876
 # CURRENT_TIME is not 64 bit time safe so it was replaced with
 # current_time()
@@ -4192,6 +4208,7 @@ AC_DEFUN([LC_PROG_LINUX_SRC], [
 	LC_SRC_VM_OPERATIONS_REMOVE_VMF_ARG
 	LC_SRC_HAVE_KEY_USAGE_REFCOUNT
 	LC_SRC_HAVE_CRYPTO_MAX_ALG_NAME_128
+	LC_SRC_HAVE_FSMAP_HEADER
 
 	# 4.12
 	LC_SRC_CURRENT_TIME
@@ -4465,6 +4482,7 @@ AC_DEFUN([LC_PROG_LINUX_RESULTS], [
 	LC_VM_OPERATIONS_REMOVE_VMF_ARG
 	LC_HAVE_KEY_USAGE_REFCOUNT
 	LC_HAVE_CRYPTO_MAX_ALG_NAME_128
+	LC_HAVE_FSMAP_HEADER
 
 	# 4.12
 	LC_CURRENT_TIME
diff --git a/lustre/target/tgt_mount.c b/lustre/target/tgt_mount.c
index eeab3c1..76d48ec 100644
--- a/lustre/target/tgt_mount.c
+++ b/lustre/target/tgt_mount.c
@@ -46,6 +46,9 @@
 #include <linux/version.h>
 #include <linux/delay.h>
 #include <linux/file.h>
+#ifdef HAVE_FSMAP_H
+#include <linux/fsmap.h>
+#endif
 
 #include <llog_swab.h>
 #include <lustre_disk.h>
@@ -2003,6 +2006,10 @@ static bool is_cmd_supported(unsigned int cmd)
 		return true;
 	case LL_IOC_RESIZE_FS:
 		return true;
+#ifdef HAVE_FSMAP_H
+	case FS_IOC_GETFSMAP:
+		return true;
+#endif
 	default:
 		return false;
 	}
-- 
1.8.3.1