Ok, ok, a few more words about it: stop holding puffs_cc as a holy
value and passing it around to almost every possible place (popquiz:
which kernel variable does this remind you of?). Instead, pass
the natural choice, puffs_usermount, and fetch puffs_cc via
puffs_cc_getcc() only in routines which actually need it. This
not only simplifies code, but (thanks to the introduction of
puffs_cc_getcc()) enables constructs which weren't previously sanely
possible, say layering as a curious example.
There's still a little to do on this front, but this was the major
fs interface blast.
The general trend is to remove it from all kernel interfaces and
this is a start. In case the calling lwp is desired, curlwp should
be used.
quick consensus on tech-kern
locking and makes it possible to run file systems which create
threads. It also makes rump file system behaviour better match
file system behaviour in the kernel.
accessors for:
* struct mount & VFS ops
* struct uio
* struct vnode
* struct vattr
and some namespace games for:
* namei flags
* VOPs
* enum vtype
Also, split rump services into two categories: library private and public
(rump_private.h and rump.h, respectively).
As a result, it is now possible to compile and use the NetBSD kernel
file systems on Linux (and probably other systems too with very
little work), although the makefiles need a bit of work to make it
a pleasureable experience.
p2k, but rather make the calls go through librump. This avoids
having to include NetBSD kernel headers in userspace programs.
Stay tuned for some more mods of the same sort ...
"console" to a file system, i.e. a tool for mounting any file system
image supported by rump and executing various commands on it.
Currently it's just a linear set of calls to ukfs routines and
serves mainly as a simple test program and ukfs usage example.
(i.e. no kernel involvement), namely:
* create, mknod, remove, mknod, rmdir, getdents, read, write, and link
Still obviously missing a few, but this is a start (I'm also searching
for the blessed orb of code quality, maybe someone has seen it?).
+ libp2k: the interface between libpuffs and vfs/vop
+ libukfs: generic user kernel file system library, usable
independent of libp2k and/or puffs
* use file system name (MOUNT_XYZ) instead of vfsops pointer to
mount file system
system faulting in pages if it does e.g. fragment reallocation
* get rid of rumpvm_findpage() and always use uvm_pagelookup()
* determine a vnode's cleanness by flagging it as being on the work
list if we "take" a write fault and removing it from the worklist
once pages are flushed. There is no work list here, but at least
there is symmetry with the kernel.
ffs in userspace on top of puffs/p2k/rump is now stable enough to
host a make -j4 kernel build (well, at least my kernel build ...
but, yes, I am currently running that kernel on my desktop)
