当前位置:首页>Linux>嵌入式Linux“根文件系统”的“只读挂载”陷阱——联发科嵌入式面试题

嵌入式Linux“根文件系统”的“只读挂载”陷阱——联发科嵌入式面试题

  • 2026-02-05 01:02:56
嵌入式Linux“根文件系统”的“只读挂载”陷阱——联发科嵌入式面试题

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-begin-

题目:为何嵌入式设备启动后,根文件系统常处于只读状态,即使手动执行mount -o remount,rw /也可能失败?如何正确配置根文件系统的读写权限?

分析流程

1.现象解析:很多开发者在定制根文件系统时,发现设备启动后无法创建文件或修改配置(提示“Read-only file system”),尝试重新挂载为读写模式也常失败,这涉及根文件系统的挂载机制、启动脚本配置及硬件存储特性。
2.深层原因

嵌入式设备的根文件系统默认只读,是内核和系统设计的双重保护机制,就像给重要文件加了“安全锁”,防止误操作或异常导致系统损坏:

内核启动参数指定:内核命令行(如bootargs)中若包含ro参数(root=/dev/mmcblk0p1 ro),根文件系统会被强制以只读模式挂载,这是最常见的原因;
文件系统损坏标记:若上一次关机异常(如断电),文件系统可能被标记为“需要检查”,内核会自动以只读模式挂载,避免进一步损坏;
存储介质特性:部分嵌入式设备使用NOR Flash等只读特性较强的存储介质,或启用了“写保护”硬件开关,导致无法切换为读写模式;
启动脚本未执行重挂载:正常流程中,init进程会在文件系统检查通过后,执行mount -o remount,rw /将根文件系统切换为读写,但脚本错误或检查失败会导致此步骤跳过。

可以结合生活常识理解:根文件系统就像“系统启动盘”,默认只读是为了防止病毒或误操作篡改系统文件;需要修改时,得先“解锁”(重挂载为读写),但如果启动盘本身有损坏,可能无法解锁。

我之前定制一款物联网网关的根文件系统时,就遇到过类似问题:内核命令行误加了ro参数,导致启动后始终只读,排查了半天存储介质和文件系统格式,最后才发现是启动参数的问题——这就是忽视内核配置细节的教训。

3.配置根文件系统读写权限的方法
修改内核启动参数:在bootloader配置中(如U-Boot的bootargs),将ro改为rw,确保根文件系统默认以读写模式挂载:

# U-Boot中设置正确的bootargs

setenv bootargs 'console=ttyS0,115200 root=/dev/mmcblk0p1 rw rootfstype=ext4'

saveenv

修复文件系统错误:若因文件系统损坏导致只读,需在启动前或单用户模式下执行检查修复命令:

# 启动时自动检查修复(适合ext4)

e2fsck -p /dev/mmcblk0p1  # -p表示自动修复错误

# 若自动修复失败,手动交互修复

e2fsck /dev/mmcblk0p1

完善启动脚本重挂载逻辑:在init脚本(如/etc/init.d/rcS)中添加重挂载命令,确保文件系统检查通过后切换为读写:

# /etc/init.d/rcS中添加

if grep -qs '/ dev/root' /proc/mounts; then

   mount -o remount,rw /  # 重挂载根文件系统为读写

fi

检查存储介质写保护:对于带硬件写保护的设备(如部分NOR Flash),需先关闭写保护开关;对于软件写保护,通过chattr命令解除:

chattr -i /  # 解除根目录的不可修改属性(若有设置)

常见误区及规避

误区1:忽略内核启动参数的优先级。即使文件系统支持读写,bootargs中的ro参数也会强制只读,需优先检查启动参数;
误区2:未处理文件系统损坏。强制重挂载损坏的文件系统为读写,可能导致数据丢失,应先修复错误;
误区3:对只读文件系统(如squashfs)强行重挂载。squashfs等压缩只读文件系统不支持读写,需更换为ext4、jffs2等支持读写的格式。

结论:根文件系统的只读状态是嵌入式设备的“安全防线”,但合理配置可按需切换为读写。记住:解决只读问题需从“内核启动参数→文件系统状态→存储介质特性”逐步排查,就像解锁多层防护的保险箱,每一层都不能忽视。

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  1. CONNECT:[ UseTime:0.000679s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000804s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000328s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003894s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000678s ]
  6. SELECT * FROM `set` [ RunTime:0.006662s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000672s ]
  8. SELECT * FROM `article` WHERE `id` = 472757 LIMIT 1 [ RunTime:0.001018s ]
  9. UPDATE `article` SET `lasttime` = 1770455289 WHERE `id` = 472757 [ RunTime:0.015624s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000286s ]
  11. SELECT * FROM `article` WHERE `id` < 472757 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000496s ]
  12. SELECT * FROM `article` WHERE `id` > 472757 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000446s ]
  13. SELECT * FROM `article` WHERE `id` < 472757 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004947s ]
  14. SELECT * FROM `article` WHERE `id` < 472757 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001107s ]
  15. SELECT * FROM `article` WHERE `id` < 472757 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000970s ]
0.107604s