the gating of system calls that cause modifications to the underlying
filesystem. The gating can be enabled by any filesystem that needs
to consistently suspend operations by adding the vop_stdgetwritemount
to their set of vnops. Once gating is enabled, the function
vfs_write_suspend stops all new write operations to a filesystem,
allows any filesystem modifying system calls already in progress
to complete, then sync's the filesystem to disk and returns. The
function vfs_write_resume allows the suspended write operations to
begin again. Gating is not added by default for all filesystems as
for SMP systems it adds two extra locks to such critical kernel
paths as the write system call. Thus, gating should only be added
as needed.
Details on the use and current status of snapshots in FFS can be
found in /sys/ufs/ffs/README.snapshot so for brevity and timelyness
is not included here. Unless and until you create a snapshot file,
these changes should have no effect on your system (famous last words).
with splhigh(). However, the entropy-harvesting routine needs pretty
serious irq-protection, as it is called out of irq handlers etc.
Clues given by: bde
in mount.h instead of ffs_extern.h. The correct solution is to use
an indirect function pointer so that the kernel does not have to be
built with options FFS, but that will be left for another day.
structure; remind myself in the cooments. Also regroup all the Yarrow
variables at the top of the variable list; they are "special".
(no functional change).
(I had been busy for my own research activity until the last weekend)
Supported devices:
SB Midi Port (sbc + midi)
SB OPL3 (sbc + midi)
16550 UART (midi, needs a trick in your hint)
CS461x Midi Port (csa + midi)
OSS-compatible sequencer (seq)
Supported playing software:
playmidi (We definitely need more)
Notes:
/dev/midistat now reports installed midi drivers. /dev/sndstat reports
only pcm drivers. We need the new name(pcmstat?).
EMU8000(SB AWE) does not sound yet but does get probed so that the OPL3
synth on an AWE card works.
TODO:
MSS/PCI bridge drivers
Midi-tty interface to support general serial devices
Modules
stack. It's bad for your machine's health.
Make the two huge structs in reseed() static to prevent crashes. This
is the bug that people have been running into and panic()ing on for the
past few days.
Reviewed by: phk
only doing so if loader.rc does not exist. This fixes the problem where
installworld doesn't update /boot/loader.4th, resulting in device.hints not
being loaded after updating past the config(8) changes, which resulted in
mcclock0 not being probed, and a nice kernel panic during boot.
are working. Add a small blurb about XE_DEBUG as it might be useful
to some people troubelshooting problems in the future.
Submitted by: "Kevin Oberman" <oberman@es.net>
hose are 16 PCI instances apart. This allows us to recognize secondary
PCI busses (at least to a first level) until the pci infrastructure is
fixed.
Turn on support for secondary cycles, too. Redo debug printouts.
Instead, for now (until we get a pci infrastructure cleanup),
assign the PCI bus number to be mcpcia bus instance << 4. This
is to allow secondary bridges some room to be recongnized on
4100 systems.
Currently, many drivers support more than one bus of ISA, EISA, MCA,
PCI.
Before this commit, we had, for example, some SCSI devices listed more
than once, iirc, some up to three times (ISA/EISA, MCA, PCI).
Since now the "device" line is common for all of them and they only
differ for the hints stuff, I did the following:
First, list Busses: (E)ISA, MCA, PCI and explain, that only ISA
needs the hints stuff.
Move NIC/SCSI stuff, which were the only split sections, behind these
stuff. Describe all drivers only one time and list all supported
chips.
List all device (+ hints for ISA, if possible).
I've also added few additional supported chips to some drivers, xl for
example and some SCSI drivers.
Also, softupdates is no longer disabled by default, so the comment should
not say, it's not enabled by default due to license issues.
Approved by: asmodai
To come: include PAO devices (imp volunteered for help)
