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While ReiserFS is obsolete and will eventually be dropped from the upstream Linux kernel in Linux 6.10 is one last ReiserFS change that was requested by former lead developer Hans Reiser.
As part of the VFS changes submitted for the upcoming Linux 6.8 merge window, a new 'BLK_DEV_WRITE_MOUNTED' Kconfig option is added that allows controlling whether writes are allowed to mounted block devices.
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When kernel code needs to work directly with user-space pages, it often calls get_user_pages() (or one of several variants) to fault those pages into RAM and pin them there. This function is not entirely easy to use, though, and recent changes have made it harder to use safely. Jan Kara and Dan Williams led a plenary session at the 2018 Linux Storage, Filesystem, and Memory-Management Summit to discuss potential solutions, but it is not entirely clear that any were found.
As Microsoft makes more progress with ReFS on Windows 11, Linux is also getting performance optimizations and improvements on some of its major file systems, namely, F2FS, Btrfs, and EXT4.
The ID-mapped mounts feature was added to Linux in 5.12, but the general idea behind it goes back a fair bit further. There are a number of different situations where the user and group IDs for files on disk do not match the current human (or process) user of those files, so ID-mapped mounts provide a way to resolve that problem—without changing the files on disk. The developer of the feature, Christian Brauner, led a discussion at the 2022 Linux Storage, Filesystem, Memory-management and BPF Summit (LSFMM) on ID-mapped mounts.