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+===================================================
+Notes on the change from 16-bit UIDs to 32-bit UIDs
+===================================================
+
+:Author: Chris Wing <wingc@umich.edu>
+:Last updated: January 11, 2000
+
+- kernel code MUST take into account __kernel_uid_t and __kernel_uid32_t
+ when communicating between user and kernel space in an ioctl or data
+ structure.
+
+- kernel code should use uid_t and gid_t in kernel-private structures and
+ code.
+
+What's left to be done for 32-bit UIDs on all Linux architectures:
+
+- Disk quotas have an interesting limitation that is not related to the
+ maximum UID/GID. They are limited by the maximum file size on the
+ underlying filesystem, because quota records are written at offsets
+ corresponding to the UID in question.
+ Further investigation is needed to see if the quota system can cope
+ properly with huge UIDs. If it can deal with 64-bit file offsets on all
+ architectures, this should not be a problem.
+
+- Decide whether or not to keep backwards compatibility with the system
+ accounting file, or if we should break it as the comments suggest
+ (currently, the old 16-bit UID and GID are still written to disk, and
+ part of the former pad space is used to store separate 32-bit UID and
+ GID)
+
+- Need to validate that OS emulation calls the 16-bit UID
+ compatibility syscalls, if the OS being emulated used 16-bit UIDs, or
+ uses the 32-bit UID system calls properly otherwise.
+
+ This affects at least:
+
+ - iBCS on Intel
+
+ - sparc32 emulation on sparc64
+ (need to support whatever new 32-bit UID system calls are added to
+ sparc32)
+
+- Validate that all filesystems behave properly.
+
+ At present, 32-bit UIDs _should_ work for:
+
+ - ext2
+ - ufs
+ - isofs
+ - nfs
+ - coda
+ - udf
+
+ Ioctl() fixups have been made for:
+
+ - ncpfs
+ - smbfs
+
+ Filesystems with simple fixups to prevent 16-bit UID wraparound:
+
+ - minix
+ - sysv
+ - qnx4
+
+ Other filesystems have not been checked yet.
+
+- The ncpfs and smpfs filesystems cannot presently use 32-bit UIDs in
+ all ioctl()s. Some new ioctl()s have been added with 32-bit UIDs, but
+ more are needed. (as well as new user<->kernel data structures)
+
+- The ELF core dump format only supports 16-bit UIDs on arm, i386, m68k,
+ sh, and sparc32. Fixing this is probably not that important, but would
+ require adding a new ELF section.
+
+- The ioctl()s used to control the in-kernel NFS server only support
+ 16-bit UIDs on arm, i386, m68k, sh, and sparc32.
+
+- make sure that the UID mapping feature of AX25 networking works properly
+ (it should be safe because it's always used a 32-bit integer to
+ communicate between user and kernel)