Linux Filesystems and VFS

1. Filesystems index

   Index of filesystem documentation and the VFS layer.

2. Overview of the VFS

   Superblock, inode, dentry and file objects and their operations tables.

3. Pathname lookup

   RCU-walk versus ref-walk path resolution and dcache use.

4. ext4

   ext4 on-disk layout, journaling, extents and mount options.

5. XFS

   XFS allocation groups, log and online repair design.

6. Btrfs

   Copy-on-write trees, subvolumes, snapshots and checksums.

7. OverlayFS

   Upper and lower layers, whiteouts and container image use.

8. FUSE

   Userspace filesystems through /dev/fuse and the FUSE protocol.

9. procfs

   The /proc interface for process and kernel state.

10. tmpfs

    Memory-backed filesystem, size and mpol options.

11. F2FS

    Flash-friendly log-structured filesystem.

12. Direct access (DAX)

    Bypassing the page cache for persistent memory.

Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.