btrfs tools

BtrfsBtrfs (b-tree file system, commonly read as Butter Fs,better FS or B-tree FS), a file system that supports write-time replication (COW), can consist of multiple underlying physical volumes. In addition, the file system supports RAID, data and meta-data check code (checksum), sub-volume, snapshot and transparent compression function.File system creationDisk partitions are formatted after the partition is created# mkfs.btrfs/dev/sda5 # mkdir/btrfsdisk # mount-t

Linux kernel Btrfs Privilege Escalation Vulnerability (CVE-2014-9710)Linux kernel Btrfs Privilege Escalation Vulnerability (CVE-2014-9710) Release date:Updated on:Affected Systems: Linux kernel Description: CVE (CAN) ID: CVE-2014-9710Linux Kernel is the Kernel of the Linux operating system.In the implementation of Btrfs in versions earlier than Linux kernel 3.1

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Btree data structure can be said to be the basis of Btrfs file system. It provides a common way to store different data types. It stores only 3 data types: Key, item, and block header. The definition of Btrfs_header is as follows: struct Btrfs_header { U8 csum[32]; U8 fsid[16]; __le64 BLOCKNR; __LE64 flags; U8 chunk_tree_uid[16]; __le64 generation; __le64 owner; __le32 Nritems

Sub-volume SubvolumeCreate a volume on a file Btrfs file system that can be mounted separately, a sub-volume similar to a directoryThis is the existing file system.Create a sub-volume nowView existing sub-volumesThe-u option is to view the UUID of the child volumeAs long as the parent volume is mounted, the child volume can be accessedMount a sub-volume separatelyIf you mount a child volume separately, the parent volume cannot be accessed. To mount a

Affected Versions:Linux kernel 2.6.xVulnerability description: Linux Kernel is the Kernel used by open source Linux. In the Btrfs Implementation of Linux Kernel, btrfs_ioctl_clone () ioctl copies the source file descriptor provided by the user to the target file descriptor, but does not check whether the source file descriptor has been opened and read before the copy operation is executed, this allows attackers to read cloned files without having the

1 /*2 * The Super block basically lists the main trees of the FS3 * It currently lacks any block count etc etc4 */5 structBtrfs_super_block {6 U8 Csum[btrfs_csum_size];7 /*The first 4 fields must match struct Btrfs_header*/8U8 Fsid[btrfs_fsid_size];/*FS specific UUID*/9__le64 Bytenr;/*This block number*/Ten __le64 flags; One A /*allowed to is different from the Btrfs_header from here own down*/ - __le64 Magic; - __le64 generation; the __le64 Root; - __le64 chunk_root; - __le64 log_root

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JVM monitoring tools-Introduction to several common tools and jvm monitoring-common toolsIntroduction to JVM monitoring tools Jdk provides a powerful GUI-based jvm monitoring tool, which can be seen in the jdk bin directory, such as jconsole, jvisualvm, and oracle jrockit jvm's jrmc.exe.Introduction: GUI tools

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Blog:http://www.simlinux.comMany system administrators still use Ifconfig, route, ARP, netstat command combinations to manage and debug network configurations, which are provided by the Net-tools package, but in the arch Linux, centos7/ RHEL7 and other distributions have been replaced with Iproute2 Net-toolsiproute2 is another network configuration tool to replace the function of net-tools;Net-

Many system administrators still use Ifconfig, route, ARP, netstat command combinations to manage and debug network configurations, which are provided by the Net-tools package, but in the arch Linux, centos7/ RHEL7 and other distributions have been replaced with Iproute2 Net-toolsiproute2 is another network configuration tool to replace the function of net-tools; Net-to