linux-kernel - [PATCH AUTOSEL for 4.9 096/190] orangefs: do not wait for timeout if umounting

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Date:   Thu, 8 Mar 2018 04:59:33 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Martin Brandenburg <martin@...ibond.com>,
        Mike Marshall <hubcap@...ibond.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.9 096/190] orangefs: do not wait for timeout if
 umounting

From: Martin Brandenburg <martin@...ibond.com>

[ Upstream commit b5a9d61eebdd0016ccb383b25a5c3d04977a6549 ]

When the computer is turned off, all the processes are killed and then
all the filesystems are umounted.  OrangeFS should not wait for the
userspace daemon to come back in that case.

This only works for plain umount(2).  To actually take advantage of this
interactively, `umount -f' is needed; otherwise umount will issue a
statfs first, which will wait for the userspace daemon to come back.

Signed-off-by: Martin Brandenburg <martin@...ibond.com>
Signed-off-by: Mike Marshall <hubcap@...ibond.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 fs/orangefs/waitqueue.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/fs/orangefs/waitqueue.c b/fs/orangefs/waitqueue.c
index f61b00887481..cbca58ba008a 100644
--- a/fs/orangefs/waitqueue.c
+++ b/fs/orangefs/waitqueue.c
@@ -124,7 +124,14 @@ int service_operation(struct orangefs_kernel_op_s *op,
 		gossip_debug(GOSSIP_WAIT_DEBUG,
 			     "%s:client core is NOT in service.\n",
 			     __func__);
-		timeout = op_timeout_secs * HZ;
+		/*
+		 * Don't wait for the userspace component to return if
+		 * the filesystem is being umounted anyway.
+		 */
+		if (op->upcall.type == ORANGEFS_VFS_OP_FS_UMOUNT)
+			timeout = 0;
+		else
+			timeout = op_timeout_secs * HZ;
 	}
 	spin_unlock(&orangefs_request_list_lock);
 
-- 
2.14.1