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From: Anand Jain <anand.jain@oracle.com>
To: linux-btrfs@vger.kernel.org
Subject: [PATCH v2] btrfs: add device scanned-by process name in the scan message
Date: Thu,  3 Oct 2019 21:36:11 +0800	[thread overview]
Message-ID: <20191003133611.2900-1-anand.jain@oracle.com> (raw)

Its very helpful if we had logged the device scanner process name
to debug the race condition between the systemd-udevd scan and the
user initiated device forget command.

This patch adds scanned-by process name to the scan message.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
---
v2: add pid as well

 fs/btrfs/volumes.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 79e66db2c1a7..3fe0c422f75f 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1005,11 +1005,13 @@ static noinline struct btrfs_device *device_list_add(const char *path,
 		*new_device_added = true;
 
 		if (disk_super->label[0])
-			pr_info("BTRFS: device label %s devid %llu transid %llu %s\n",
-				disk_super->label, devid, found_transid, path);
+pr_info("BTRFS: device label %s devid %llu transid %llu %s scanned-by %s(%d)\n",
+				disk_super->label, devid, found_transid, path,
+				current->comm, task_pid_nr(current));
 		else
-			pr_info("BTRFS: device fsid %pU devid %llu transid %llu %s\n",
-				disk_super->fsid, devid, found_transid, path);
+pr_info("BTRFS: device fsid %pU devid %llu transid %llu %s scanned-by %s(%d)\n",
+				disk_super->fsid, devid, found_transid, path,
+				current->comm, task_pid_nr(current));
 
 	} else if (!device->name || strcmp(device->name->str, path)) {
 		/*
-- 
1.8.3.1


                 reply	other threads:[~2019-10-03 13:36 UTC|newest]

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