4. Filesystems and Storage updates

In the 5.4 update, several significant additions have been made to file systems support. Base Red Hat Enterprise Linux now includes the Filesystem in Userspace (FUSE) kernel modules and user space utilities, allowing users to install and run their own FUSE file systems on an unmodified Red Hat Enterprise Linux kernel (BZ#457975). Support for the XFS file system has also been added to the kernel for future product enablement (BZ#470845). The FIEMAP input/output control (ioctl) interface has been implemented, allowing the physical layout of files to be mapped efficiently. The FIEMAP ioctl can be used by applications to check for fragmentation of a specific file or to create an optimized copy of a sparsely allocated file (BZ#296951).

另​​​​​​​​​​​​​​​外​​​​​​​​​​​​​​​，在​​​​​​​​​​​​​​​内​​​​​​​​​​​​​​​核​​​​​​​​​​​​​​​中​​​​​​​​​​​​​​​更​​​​​​​​​​​​​​​新​​​​​​​​​​​​​​​了​​​​​​​​​​​​​​​通​​​​​​​​​​​​​​​用​​​​​​​​​​​​​​​互​​​​​​​​​​​​​​​联​​​​​​​​​​​​​​​网​​​​​​​​​​​​​​​文​​​​​​​​​​​​​​​件​​​​​​​​​​​​​​​系​​​​​​​​​​​​​​​统​​​​​​​​​​​​​​​（CIFS）(BZ#465143)。​​​​​​​​​​​​​​​更​​​​​​​​​​​​​​​新​​​​​​​​​​​​​​​了​​​​​​​​​​​​​​​ ext4 文​​​​​​​​​​​​​​​件​​​​​​​​​​​​​​​系​​​​​​​​​​​​​​​统​​​​​​​​​​​​​​​（在​​​​​​​​​​​​​​​红​​​​​​​​​​​​​​​帽​​​​​​​​​​​​​​​企​​​​​​​​​​​​​​​业​​​​​​​​​​​​​​​版​​​​​​​​​​​​​​​ Linux 中​​​​​​​​​​​​​​​作​​​​​​​​​​​​​​​为​​​​​​​​​​​​​​​技​​​​​​​​​​​​​​​术​​​​​​​​​​​​​​​预​​​​​​​​​​​​​​​览​​​​​​​​​​​​​​​出​​​​​​​​​​​​​​​现​​​​​​​​​​​​​​​）(BZ#485315)。​​​​​​​​​​​​​​​

在​​​​​​​​​​​​​​​红​​​​​​​​​​​​​​​帽​​​​​​​​​​​​​​​企​​​​​​​​​​​​​​​业​​​​​​​​​​​​​​​版​​​​​​​​​​​​​​​ Linux 5.4 这​​​​​​​​​​​​​​​，全​​​​​​​​​​​​​​​局​​​​​​​​​​​​​​​文​​​​​​​​​​​​​​​件​​​​​​​​​​​​​​​系​​​​​​​​​​​​​​​统​​​​​​​​​​​​​​​ 2（GFS2）作​​​​​​​​​​​​​​​为​​​​​​​​​​​​​​​单​​​​​​​​​​​​​​​一​​​​​​​​​​​​​​​服​​​​​​​​​​​​​​​务​​​​​​​​​​​​​​​器​​​​​​​​​​​​​​​文​​​​​​​​​​​​​​​件​​​​​​​​​​​​​​​系​​​​​​​​​​​​​​​统​​​​​​​​​​​​​​​使​​​​​​​​​​​​​​​用​​​​​​​​​​​​​​​（例​​​​​​​​​​​​​​​如​​​​​​​​​​​​​​​：不​​​​​​​​​​​​​​​在​​​​​​​​​​​​​​​群​​​​​​​​​​​​​​​集​​​​​​​​​​​​​​​的​​​​​​​​​​​​​​​环​​​​​​​​​​​​​​​境​​​​​​​​​​​​​​​中​​​​​​​​​​​​​​​）已​​​​​​​​​​​​​​​经​​​​​​​​​​​​​​​过​​​​​​​​​​​​​​​时​​​​​​​​​​​​​​​。​​​​​​​​​​​​​​​不​​​​​​​​​​​​​​​需​​​​​​​​​​​​​​​要​​​​​​​​​​​​​​​高​​​​​​​​​​​​​​​可​​​​​​​​​​​​​​​用​​​​​​​​​​​​​​​性​​​​​​​​​​​​​​​群​​​​​​​​​​​​​​​集​​​​​​​​​​​​​​​的​​​​​​​​​​​​​​​ GFS2 用​​​​​​​​​​​​​​​户​​​​​​​​​​​​​​​可​​​​​​​​​​​​​​​考​​​​​​​​​​​​​​​虑​​​​​​​​​​​​​​​迁​​​​​​​​​​​​​​​移​​​​​​​​​​​​​​​到​​​​​​​​​​​​​​​其​​​​​​​​​​​​​​​它​​​​​​​​​​​​​​​文​​​​​​​​​​​​​​​件​​​​​​​​​​​​​​​系​​​​​​​​​​​​​​​统​​​​​​​​​​​​​​​，比​​​​​​​​​​​​​​​如​​​​​​​​​​​​​​​ ext3 或​​​​​​​​​​​​​​​者​​​​​​​​​​​​​​​ xfs。​​​​​​​​​​​​​​​xfs 文​​​​​​​​​​​​​​​件​​​​​​​​​​​​​​​系​​​​​​​​​​​​​​​统​​​​​​​​​​​​​​​是​​​​​​​​​​​​​​​特​​​​​​​​​​​​​​​别​​​​​​​​​​​​​​​用​​​​​​​​​​​​​​​于​​​​​​​​​​​​​​​超​​​​​​​​​​​​​​​大​​​​​​​​​​​​​​​文​​​​​​​​​​​​​​​件​​​​​​​​​​​​​​​系​​​​​​​​​​​​​​​统​​​​​​​​​​​​​​​的​​​​​​​​​​​​​​​（16TB 或​​​​​​​​​​​​​​​以​​​​​​​​​​​​​​​上​​​​​​​​​​​​​​​）。​​​​​​​​​​​​​​​将​​​​​​​​​​​​​​​会​​​​​​​​​​​​​​​支​​​​​​​​​​​​​​​持​​​​​​​​​​​​​​​现​​​​​​​​​​​​​​​有​​​​​​​​​​​​​​​用​​​​​​​​​​​​​​​户​​​​​​​​​​​​​​​。​​​​​​​​​​​​​​​

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已​​​​​​​​​​​​​​​经​​​​​​​​​​​​​​​使​​​​​​​​​​​​​​​用​​​​​​​​​​​​​​​更​​​​​​​​​​​​​​​新​​​​​​​​​​​​​​​的​​​​​​​​​​​​​​​用​​​​​​​​​​​​​​​户​​​​​​​​​​​​​​​空​​​​​​​​​​​​​​​间​​​​​​​​​​​​​​​工​​​​​​​​​​​​​​​具​​​​​​​​​​​​​​​刷​​​​​​​​​​​​​​​新​​​​​​​​​​​​​​​了​​​​​​​​​​​​​​​ ext4 文​​​​​​​​​​​​​​​件​​​​​​​​​​​​​​​系​​​​​​​​​​​​​​​统​​​​​​​​​​​​​​​技​​​​​​​​​​​​​​​术​​​​​​​​​​​​​​​预​​​​​​​​​​​​​​​览​​​​​​​​​​​​​​​。​​​​​​​​​​​​​​​Ext4 是​​​​​​​​​​​​​​​在​​​​​​​​​​​​​​​由​​​​​​​​​​​​​​​红​​​​​​​​​​​​​​​帽​​​​​​​​​​​​​​​以​​​​​​​​​​​​​​​及​​​​​​​​​​​​​​​ Linux 社​​​​​​​​​​​​​​​区​​​​​​​​​​​​​​​开​​​​​​​​​​​​​​​发​​​​​​​​​​​​​​​的​​​​​​​​​​​​​​​ ext3 文​​​​​​​​​​​​​​​件​​​​​​​​​​​​​​​系​​​​​​​​​​​​​​​统​​​​​​​​​​​​​​​基​​​​​​​​​​​​​​​础​​​​​​​​​​​​​​​上​​​​​​​​​​​​​​​的​​​​​​​​​​​​​​​改​​​​​​​​​​​​​​​进​​​​​​​​​​​​​​​。​​​​​​​​​​​​​​​

With this update, the dmraid logwatch-based email reporting feature has been moved from the dmraid-events package into the new dmraid-events-logwatch package. Consequently, systems that use this dmraid feature will need to complete the following manual procedure: (BZ#512833)

samba3x and ctdb are provided as a Technology Preview on the x86_64 platform. Samba3x package provides Samba 3.3 and ctdb provide a clustered TDB backend. Running samba3x and ctdb on a set of cluster nodes with GFS file system will allow the export of a clustered CIFS filesystem.