hi3536平台 正在往u盘写文件，直接拔出的异常处理

本帖最后由 sanmaoljh 于 2018-5-21 18:02 编辑

问：hi3536平台 正在往u盘写文件，直接拔出u盘的异常处理？

U盘挂载到/mnt/udisk下目录
~ # mount
rootfs on / type rootfs (rw)
/dev/root on / type yaffs2 (rw,relatime)
proc on /proc type proc (rw,relatime)
sysfs on /sys type sysfs (rw,relatime)
tmpfs on /dev type tmpfs (rw,relatime)
tmpfs on /opt/tmp type tmpfs (rw,relatime,size=307200k)
devpts on /dev/pts type devpts (rw,relatime,mode=600)
/dev/mtdblock6 on /userdata type yaffs2 (rw,relatime)
/dev/sda1 on /mnt/udisk type vfat (rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,utf8,errors=remount-ro)

拔出U盘后串口打印记录
usb 2-1.1: USB disconnect, device number 13
sd 12:0:0:0: [sda] Unhandled error code
sd 12:0:0:0: [sda]  
Result: hostbyte=0x01 driverbyte=0x00
sd 12:0:0:0: [sda] CDB:
cdb[0]=0x2a: 2a 00 00 10 37 40 00 00 f0 00
end_request: I/O error, dev sda, sector 1062720
FAT-fs (sda1): FAT read failed (blocknr 2792)
sd 12:0:0:0: [sda] Unhandled error code
sd 12:0:0:0: [sda]  
Result: hostbyte=0x01 driverbyte=0x00
sd 12:0:0:0: [sda] CDB:
cdb[0]=0x2a: 2a 00 00 10 38 30 00 00 f0 00
end_request: I/O error, dev sda, sector 1062960
FAT-fs (sda1): FAT read failed (blocknr 2791)
FAT-fs (sda1): Directory bread(block 85760) failed
FAT-fs (sda1): Directory bread(block 85761) failed
FAT-fs (sda1): Directory bread(block 85762) failed
FAT-fs (sda1): Directory bread(block 85763) failed
FAT-fs (sda1): Directory bread(block 85764) failed
FAT-fs (sda1): Directory bread(block 85765) failed
FAT-fs (sda1): Directory bread(block 85766) failed
FAT-fs (sda1): Directory bread(block 85767) failed
FAT-fs (sda1): Directory bread(block 85760) failed
FAT-fs (sda1): Directory bread(block 85761) failed
FAT-fs (sda1): FAT read failed (blocknr 2792)
FAT-fs (sda1): FAT read failed (blocknr 2792)
FAT-fs (sda1): FAT read failed (blocknr 2792)
FAT-fs (sda1): FAT read failed (blocknr 2792)
FAT-fs (sda1): FAT read failed (blocknr 2792)
FAT-fs (sda1): FAT read failed (blocknr 2792)
/dev/sda1
FAT-fs (sda1): FAT read failed (blocknr 2792)
FAT-fs (sda1): FAT read failed (blocknr 2792)
FAT-fs (sda1): FAT read failed (blocknr 2792)
FAT-fs (sda1): FAT read failed (blocknr 2792)
/dev/sda
FAT-fs (sda1): unable to read inode block for updating (i_pos 1306517)
FAT-fs (sda1): unable to read inode block for updating (i_pos 262537)
FAT-fs (sda1): unable to read inode block for updating (i_pos 262153)


同时执行cp测试也提示错误
~ #
~ # cp /opt/hdmeeting/ /mnt/udisk/ -rf
cp: write error: Input/output error
cp: can't create '/mnt/udisk/hdmeeting/plugins/platforms/libqoffscreen.so': Input/output error
cp: can't create '/mnt/udisk/hdmeeting/plugins/platforms/libqeglfs.so': Input/output error
cp: can't create '/mnt/udisk/hdmeeting/plugins/platforms/libqminimalegl.so': Input/output error
cp: can't create '/mnt/udisk/hdmeeting/plugins/platforms/libqlinuxfb.so': Input/output error
cp: can't create '/mnt/udisk/hdmeeting/plugins/platforms/libqminimal.so': Input/output error
cp: can't create directory '/mnt/udisk/hdmeeting/config': Input/output error
cp: can't create directory '/mnt/udisk/hdmeeting/firmware': Input/output error
cp: can't create directory '/mnt/udisk/hdmeeting/lib': Input/output error
cp: can't create directory '/mnt/udisk/hdmeeting/web': Input/output error
cp: can't create directory '/mnt/udisk/hdmeeting/bin': Input/output error


同时出现错误后，挂载点还存在，如果安全操作的话，拔出u盘挂载点也会消失
~ # mount
rootfs on / type rootfs (rw)
/dev/root on / type yaffs2 (rw,relatime)
proc on /proc type proc (rw,relatime)
sysfs on /sys type sysfs (rw,relatime)
tmpfs on /dev type tmpfs (rw,relatime)
tmpfs on /opt/tmp type tmpfs (rw,relatime,size=307200k)
devpts on /dev/pts type devpts (rw,relatime,mode=600)
/dev/mtdblock6 on /userdata type yaffs2 (rw,relatime)
/dev/sda1 on /mnt/udisk type vfat (rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,utf8,errors=remount-ro)

比如这种正在往U盘写文件，突然拔出U盘的操作，在嵌入式linux平台应该怎么处理，谢谢！