blk_update_request: i/o error, dev fd0, sector 0 op 0x0:(read) flags 0x0 phy 是一个Linux系统错误消息,表示在尝试对设备 fd0(通常是软盘驱动器)的扇区 0 进行读取(op 0x0:(read))操作时发生了I/O错误。flags 0x0 phy 提供了关于操作的一些额外信息,但通常不是解决问题的关键。 2. 提供可能导...
So, to summarize, READ32() instructs the compiler to always read a 4-byte word, without doing any optimizations: always accessing directly from memory. Getting back to the virtio_dev_init() function, we use this macro again to read out the Version register, which we expect to contain the...
So, to summarize, READ32() instructs the compiler to always read a 4-byte word, without doing any optimizations: always accessing directly from memory. Getting back to the virtio_dev_init() function, we use this macro again to read out the Version register, which we expect to contain the...
Result: hostbyte=DID_OK driverbyte=DRIVER_OK kernel: sd 33:0:1:0: [sdc] CDB: Read(10) 28 00 ba df ff f8 00 00 08 00 kernel:blk_update_request: critical nexus error, dev sdc, sector 3135242232 kernel: Buffer I/O error on dev sdc, logical block 391905279, async page read ...
通过to_vp_device将virtio_device转换成virtio-pci,我们在前端虚拟机内创建的virtio设备都是一个pci设备,因此可以利用PCI设备的配置空间来完成前后端消息通知,vp_dev->ioaddr就指向配置空间的寄存器集合的首地址。 iowrite写寄存器VIRTIO_PCI_QUEUE_SEL来通知QEMU端,当前初始化的是第index号vring_virtqueue;ioread则从...
/dev/sdb1 1 201 392522 b W95 FAT32 /dev/sdb2 202 1020 1599507 83 Linux Command (m for help): w The partition table has been altered! Calling ioctl() to re-read partition table. WARNING: Re-reading the partition table failed with error 16: 设备或资源 ...
A1: 用户态块设备就是提供一个/dev/ubdbX这样的块设备,所有这个设备上的IO请求的读写逻辑都是您在用户态编写的代码,比如pread/pwrite到一个具体地文件(这样就是loop设备了)。使用用户态块设备,你可以方便地向上层业务提供您的存储系统(如ceph),业务只需要对块设备执行标准的读写操作即可。如果您有一个用户态的...
system %iowait %steal %idle10.81 0.00 14.11 0.18 0.00 74.90Device: tps Blk_read.../s Blk_wrtn/s Blk_read Blk_wrtnsda ...
//1、实时查看磁盘IO数据blktrace -d -filename -o - | blkparse -i -//2、Blktrace工具一共包含三个可执行文件:blktrace、blkparse、bttblktrace -d /dev/sda//采集信息:会根据cpu个数来生成文件个数,名为{device}.blktrace.{cpu}blkparse -i sda.blktrace.0//分析信息(可选执行):blkparse会将blktr...
1026 DevBlkCDIDevice *handle, 1027 struct DevBlkCDIModuleConfig *moduleConfig); 1028 1084 NvMediaStatus (* SetSensorCharMode)( 1085 DevBlkCDIDevice *handle, 1086 uint8_t expNo); 1087 #endif 1088 1109 NvMediaStatus (* ReadRegister)( 1110 DevBlkCDIDevice const* handle, 1111...