btrfs: print process name and pid that calls device scanning (aa6c0df7) · Commits · 戴 / test

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 process name and pid to the scan message. Signed-off-by:

Anand Jain <anand.jain@oracle.com> Reviewed-by:

David Sterba <dsterba@suse.com> [ add pid to the message ] Signed-off-by:

David Sterba <dsterba@suse.com>

fs/btrfs/volumes.c

+8 −4

Original line number	Diff line number	Diff line
		@@ -1005,11 +1005,15 @@ 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)) {
		/*

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