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系统环境：Ubuntu18.04 aarch64 英伟达Tx2的开发板
Fat32和exFat的U盘会有两个挂载位置，/media/mc/udisk和/media/9CCD-587F
看了系统日志，有下面两条记录：
（1）
udisksd[4481]: Mounted /dev/sdb1 at /media/mc/udisk on behalf of uid 1000
（2）
systemd[1]: Started File System Check on /dev/sdb1.
systemd[1]: Mounting /media/9CCD-587F...
systemd[1]: Mounted /media/9CCD-587F
然后NTFS格式的U盘只有一个挂载位置，看日志也挂载了2次，其中1次失败了
udisksd挂载成功了，
挂载失败的如下：
mount[9696]:Mount is denied because the NTFS volume is already exclusively opened.
mount[9696]:The volume may be already mounted, or another software may use it which could be identified for example by the help of the 'fuser' command.
systemd[1]:media-685C5CBA5C5C84AA.mount: Mount process exited, code=exited status=16
systemd[1]:media-685C5CBA5C5C84AA.mount: Failed width result 'exit-code'.
systemd[1]:Failed to mount /media/685C5CBA5C5C84AA

请问下各位大佬这是什么问题，如何修复？

看一下挂载到/media/xxxxx位置的systemd挂载单元的名字，再用systemctl cat xxxx.mount看一下内容

astolia 写了： ↑2021-08-20 15:44

代码： 全选

systemctl | fgrep .mount

看一下挂载到/media/xxxxx位置的systemd挂载单元的名字，再用systemctl cat xxxx.mount看一下内容

U盘：udisk，挂载点：/media/mc/udisk和/media/9CCD-587F
查看结果：

# /run/systemd/transient/media-9CCD\x2d587F.mount
# This is a transient unit file, created programmatically via the systemd API. Do not edit.
[Unit]
After=dev-sdb1.device
BindsTo=dev-sdb1.device
CollectMode=inactive-or-failed

[Mount]
What=/dev/sdb1

[Unit]
Requires=systemd-fsck@dev-sdb1.service
After=systemd-fsck@dev-sdb1.service

挂载到/media/mc/udisk的.mount文件呢？

astolia 写了： ↑2021-08-27 12:18 挂载到/media/mc/udisk的.mount文件呢？

systemctl | fgrep .mount
输出U盘相关：
media-mc-udisk.mount loaded active mounted /media/mc/udisk

systemctl cat media-mc-udisk.mount
输出：
No files found for media-mc-udisk.mount.

找不到文件？

问题已解决
在/dev/udev/rules.d的规则文件99-nv-ufs-mount.rules，把两行ACTION注释掉
#
# Copyright (c) 2019, NVIDIA CORPORATION. All rights reserved.
#

# Mount UFS card when detected.
#ACTION=="add", KERNEL=="sd[a-z][0-9]", SUBSYSTEM=="block", RUN{program}+="/usr/bin/systemd-mount --no-block --automount=yes --collect $devnode /media/%E{ID_FS_UUID}"

# Unmount UFS card when removed.
#ACTION=="remove", KERNEL=="sd[a-z][0-9]", SUBSYSTEM=="block", RUN{program}+="/usr/bin/systemd-umount /media/%E{ID_FS_UUID}"