that occurs during a reconstruction. We go from zero error handling
and likely panicing if something goes amiss, to gracefully bailing and
leaving the system in the best, usable state possible.
- introduce rf_DrainReconEventQueue() to allow easy cleaning of the
reconstruction event queue
- change how we cleanup the floating recon buffers in
rf_FreeReconControl(). Detect the end of the list rather
than traversing according to a count.
- keep track of the number of pending reconstruction writes. In the
event of a read error, use this to wait long enough for the pending
writes to (hopefully) drain.
- more cleanup is still needed on this code, but I didn't want to
start mixing major functional changes with minor cleanups.
XXX: There is a known issue with pool items left outstanding due to
the IO failure, and this can show up in the form of a panic at the
tail end of a shutdown. This problem is much less severe than before
these changes, and the hope/plan is that this problem will go away
once this code gets overhauled again.
of strenuous agreement, and some general agreement, this commit is
going ahead because it's now starting to block some other changes I
wish to make.]
Remove most of the support for the concept of "rows" from RAIDframe.
While the "row" interface has been exported to the world, RAIDframe
internals have really only supported a single row, even though they
have feigned support of multiple rows.
Nothing changes in configuration land -- config files still need to
specify a single row, etc. All auto-config structures remain fully
forward/backwards compatible.
The only visible difference to the average user should be a
reduction in the size of a GENERIC kernel (i386) by 4.5K. For those
of us trolling through RAIDframe kernel code, a lot of the driver
configuration code has become a LOT easier to read.
the stuff that used to live in rf_types.h, rf_raidframe.h, rf_layout.h,
rf_netbsd.h, rf_raid.h, rf_decluster,h, and a few other places.
Believe it or not, when this is all done, things will be cleaner.
No functional changes to RAIDframe.
out-dated comments, and other unneeded stuff. This helps prepare
for cleaning up the rest of the code, and adding new functionality.
No functional changes to the kernel code in this commit.
Carnegie Mellon University. Full RAID implementation, including
levels 0, 1, 4, 5, 6, parity logging, and a few other goodies.
Ported to NetBSD by Greg Oster.
