3 results about "Device mapper" patented technology

Disclosed are a method and apparatus for mirror image verification based on a dual-chain-of-trust mechanism, a device, and a medium. The method for mirror image verification based on a dual-chain-of-trust mechanism comprises: determining a read-only file system on the basis of an original mirror image file system and target operating system verification information; constructing a signed mirror image by means of the read-only file system, a root hash value file generated on the basis of the read-only file system, a customized public key, and a signature result of a customized private key on the root hash value file, the root hash value file being obtained on the basis of a device mapper verification method of a hardware manufacturer chain-of-trust mechanism, and the customized public key being stored in a one-time programmable region; performing a target operation on the customized public key to obtain a first encrypted value, writing the first encrypted value into a verified mirror image, and burning the signed mirror image into a device flash memory; after the device is powered on, mounting the signed mirror image on the basis of a startup script of the started verified mirror image, and performing a target operation on the customized public key in the signed mirror image to obtain a second encrypted value; and if the first encrypted value is the same as the second encrypted value, verifying the root hash value file on the basis of the customized public key and the signature result, and if the verification passes, implementing verified boot of the target operating system by means of the root hash value file, so as to ensure the reliability of the chain-of-trust mechanism of the target operating system.

This application provides a method and system for detecting anomalies in Linux kernel I / O event handling. The method includes: collecting the I / O request dwell time without locks through percpu variables at preset I / O blocking nodes in the Linux kernel storage stack bio and request stages; creating file nodes in debugfs to summarize and output the time-consuming data in response to user-space read requests; and creating an I / O tracking structure for each I / O stage of each block device to manage the entry and exit of instances in the I / O request stage. It can also track the I / O context by registering hooks in the Device Mapper framework, and achieve asynchronous data interaction between the kernel and user space using a lock-free circular buffer and the io_uring interface. This application achieves layered observation of the entire I / O chain, low-overhead lock-free operation, and can locate abnormal I / O in seconds, balancing observation accuracy and business I / O performance, without affecting business operations.

The invention provides a BCache conversion method, a BCache conversion system and BCache conversion equipment capable of reserving original disk data, and belongs to the technical field of computers. The method comprises the following steps: creating a mirror image file of a BCache metadata area, wherein the mirror image file is a 8KB blank mirror image file; mounting the mirror image file as a loop device, so that the mirror image file is identified in a block device form; constructing a device mapper mapping table to realize linear address mapping of a metadata area and an original block equipment data area in the combined block equipment; based on the mapping table, using a device mapper tool to create a combined block device so as to integrate the metadata area space of the loop device and the data area space of the original block device; the combined block device is used as a back-end device, the BCache device is created by using the preset cache device, the BCache device retains the original data of the original block device through the mapping relation, and data access acceleration is realized through the cache device.