Extended
attributes (xattrs) provide a way to attach key/value metadata to
inodes-files, directories, and the like-in a filesystem. As with many
Linux filesystems, the FUSE filesystem
supports xattrs. In a filesystem-track session at the 2026 Linux Storage, Filesystem, Memory Management, and BPF Summit, FUSE maintainer Miklos
Szeredi led a discussion about caching xattrs in kernel memory; he would
like to create some common infrastructure that could be used by FUSE and
shared with other filesystems.

https://lwn.net/Articles/1074919/
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