Rename DIOCGKERNELDUMP to DIOCSKERNELDUMP as it strictly speaking
is a "set" not a "get" operation.

Sponsored by: DARPA & NAI Labs.

Here follows the new kernel dumping infrastructure.

Caveats:

The new savecore program is not complete in the sense that it emulates
enough of the old savecores features to do the job, but implement

Here follows the new kernel dumping infrastructure.

Caveats:

The new savecore program is not complete in the sense that it emulates
enough of the old savecores features to do the job, but implements none
of the options yet.

I would appreciate if a userland hacker could help me out getting savecore
to do what we want it to do from a users point of view, compression,
email-notification, space reservation etc etc. (send me email if
you are interested).

Currently, savecore will scan all devices marked as "swap" or "dump" in
/etc/fstab _or_ any devices specified on the command-line.

All architectures but i386 lack an implementation of dumpsys(), but
looking at the i386 version it should be trivial for anybody familiar
with the platform(s) to provide this function.

Documentation is quite sparse at this time, more to come.

Details:

ATA and SCSI drivers should work as the dump formatting code has been
removed. The IDA, TWE and AAC have not yet been converted.

Dumpon now opens the device and uses ioctl(DIOCGKERNELDUMP) to set
the device as dumpdev. To implement the "off" argument, /dev/null
is used as the device.

Savecore will fail if handed any options since they are not (yet)
implemented. All devices marked "dump" or "swap" in /etc/fstab
will be scanned and dumps found will be saved to diskfiles
named from the MD5 hash of the header record. The header record
is dumped in readable format in the .info file. The kernel
is not saved. Only complete dumps will be saved.

All maintainer rights for this code are disclaimed: feel free to
improve and extend.

Sponsored by: DARPA, NAI Labs

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Make the disk_clone() routine more robust for abuse.
Sneak in a trivial bit of the GEOM stuff while we're here anyway.

Fix a warning.

Don't call cdevsw_add().

Rename the top 7 bits if disk minors to spare bits, rather than type bits.

Don't choke on old sd%d.ctl devices.

Tripped over by: Jos Backus <josb@cncdsl.com>

Turn the symlinks around, instead of ad0s1 -> ad0s1c, make it ad0s1c -> ad0s1.

Requested by: peter

Fix a problem in the disk related hack where device nodes for a physically
non-existent disk in a legacy /dev on a DEVFS system would panic the system
if stat(2)'ed.

Do not whine about anonymous dev

Fix a problem in the disk related hack where device nodes for a physically
non-existent disk in a legacy /dev on a DEVFS system would panic the system
if stat(2)'ed.

Do not whine about anonymous device nodes not having a si_devsw, they're
not supposed to.

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Nudge the axe a bit closer to cdevsw[]:

Make it a panic to repeat make_dev() or destroy_dev(), this check
should maybe be neutered when -current goes -stable.

Whine if devsw() is called on

Nudge the axe a bit closer to cdevsw[]:

Make it a panic to repeat make_dev() or destroy_dev(), this check
should maybe be neutered when -current goes -stable.

Whine if devsw() is called on anon dev_t's in a devfs system.

Make a hack to avoid our lazy-eval disk code triggering the above whine.

Fix the multiple make_dev() in disk code by making ${disk}${unit}s${slice}
an alias/symlink to ${disk}${unit}s${slice}c

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disk_clone() was a bit too eager to please: "md0s1ec" is not a valid
device.

Noticed by: Chad David <davidc@acns.ab.ca>

KSE Milestone 2
Note ALL MODULES MUST BE RECOMPILED
make the kernel aware that there are smaller units of scheduling than the
process. (but only allow one thread per process at this time).
This is fu

KSE Milestone 2
Note ALL MODULES MUST BE RECOMPILED
make the kernel aware that there are smaller units of scheduling than the
process. (but only allow one thread per process at this time).
This is functionally equivalent to teh previousl -current except
that there is a thread associated with each process.

Sorry john! (your next MFC will be a doosie!)

Reviewed by: peter@freebsd.org, dillon@freebsd.org

X-MFC after: ha ha ha ha

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Don't dump on the label sector or below. This avoids clobbering the
label if the dump device overflaps the label (which is a slight
misconfiguration). Dump routines don't use dscheck(), so the norm

Don't dump on the label sector or below. This avoids clobbering the
label if the dump device overflaps the label (which is a slight
misconfiguration). Dump routines don't use dscheck(), so the normal
write protection of the label doesn't help.

Reduced some nearby overflow bugs. In disk_dumpcheck(), there was
(fatal but fail-safe) overflow on i386's with 4GB of memory, at least
if Maxmem was the top page (can this happen?). The fix assumes that
the sector size divides PAGE_SIZE (dump routines already assume this).
In setdumpdev(), the corresponding overflow occurred with only about
2GB of memory on all machines with 32-bit ints. This allowed setdumpdev()
to succeed when it shouldn't have, but then disk_dumpcheck() failed
safe later. Except in old versions of FreeBSD like RELENG_3 where
there is no disk_dumpcheck().

PR: 28164 (label clobbering part)
MFC after: 1 week

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Remove the hack-around for the slice/label code, it didn't
cover the hole.

The disklabel/slice code is more twisted than I thought. Revert to
calling the cdevsw_add() unconditionally.

Create a general facility for making dev_t's depend on another
dev_t. The dev_depends(dev_t, dev_t) function is for tying them
to each other.

When destroy_dev() is called on a dev_t, all dev_t's de

Create a general facility for making dev_t's depend on another
dev_t. The dev_depends(dev_t, dev_t) function is for tying them
to each other.

When destroy_dev() is called on a dev_t, all dev_t's depending
on it will also be destroyed (depth first order).

Rewrite the make_dev_alias() to use this dependency facility.

kern/subr_disk.c:
Make the disk mini-layer use dependencies to make sure all
relevant dev_t's are removed when the disk disappears.

Make the disk mini-layer precreate some magic sub devices
which the disk/slice/label code expects to be there.

kern/subr_disklabel.c:
Remove some now unneeded variables.

kern/subr_diskmbr.c:
Remove some ancient, commented out code.

kern/subr_diskslice.c:
Minor cleanup. Use name from dev_t instead of dsname()

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Don't take the detour around devsw() to find out if the proto-cdevsw
is already initialized.

Always initialize bio_resid from bio_bcount in the disk mini-layer so
that the drivers don't have to do it umpteen times.

Make the disk mini-layer check for and handle zero-length transfers
instead of the underlying drivers.

Actually biofinish(struct bio *, struct devstat *, int error) is more general
than the bioerror().

Most of this patch is generated by scripts.

Dont call device close and ioctl functions if device has disappeared.

Reviewed by: phk

Don't clone impossible unit numbers for disks.

Staticize some malloc M_ instances.

Avoid the modules madness I inadvertently introduced by making the
cloning infrastructure standard in kern_conf. Modules are now
the same with or without devfs support.

If you need to detect if dev

Avoid the modules madness I inadvertently introduced by making the
cloning infrastructure standard in kern_conf. Modules are now
the same with or without devfs support.

If you need to detect if devfs is present, in modules or elsewhere,
check the integer variable "devfs_present".

This happily removes an ugly hack from kern/vfs_conf.c.

This forces a rename of the eventhandler and the standard clone
helper function.

Include <sys/eventhandler.h> in <sys/conf.h>: it's a helper #include
like <sys/queue.h>

Remove all #includes of opt_devfs.h they no longer matter.

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Remove all traces of Julians DEVFS (incl from kern/subr_diskslice.c)

Remove old DEVFS support fields from dev_t.

Make uid, gid & mode members of dev_t and set them in make_dev().

Use correct

Remove all traces of Julians DEVFS (incl from kern/subr_diskslice.c)

Remove old DEVFS support fields from dev_t.

Make uid, gid & mode members of dev_t and set them in make_dev().

Use correct uid, gid & mode in make_dev in disk minilayer.

Add support for registering alias names for a dev_t using the
new function make_dev_alias(). These will show up as symlinks
in DEVFS.

Use makedev() rather than make_dev() for MFSs magic devices to prevent
DEVFS from noticing this abuse.

Add a field for DEVFS inode number in dev_t.

Add new DEVFS in fs/devfs.

Add devfs cloning to:
disk minilayer (ie: ad(4), sd(4), cd(4) etc etc)
md(4), tun(4), bpf(4), fd(4)

If DEVFS add -d flag to /sbin/inits args to make it mount devfs.

Add commented out DEVFS to GENERIC

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