From: Alex Zhuravlev <bzzz@whamcloud.com>
Date: Tue, 17 Oct 2023 11:09:37 +0000 (+0300)
Subject: LU-17202 target: set SB_KERNMOUNT
X-Git-Url: https://git.whamcloud.com/?a=commitdiff_plain;h=005a85f1c17a6c3477786a47dccfb67f2b36cb09;p=fs%2Flustre-release.git

LU-17202 target: set SB_KERNMOUNT

set SB_KERNMOUNT on server's mountpoint so umount process block
until the server (MDS/OST/MGS) is really umounted and released
the corresponding block device.

Signed-off-by: Alex Zhuravlev <bzzz@whamcloud.com>
Change-Id: I03ac2dc6bb7cd4d93f5a1729fccb976aa1ebd5d4
---

diff --git a/lustre/target/tgt_mount.c b/lustre/target/tgt_mount.c
index eeab3c1..692d266 100644
--- a/lustre/target/tgt_mount.c
+++ b/lustre/target/tgt_mount.c
@@ -2065,7 +2065,8 @@ static int server_fill_super_common(struct super_block *sb)
 	sb->s_blocksize_bits = log2(sb->s_blocksize);
 	sb->s_magic = LUSTRE_SUPER_MAGIC;
 	sb->s_maxbytes = 0; /* we don't allow file IO on server mountpoints */
-	sb->s_flags |= SB_RDONLY;
+	/* set SB_KERNMOUNT to make umount synchronous */
+	sb->s_flags |= SB_RDONLY | SB_KERNMOUNT;
 	sb->s_op = &server_ops;
 
 	root = new_inode(sb);