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History log of /src/sys/miscfs/kernfs/kernfs_vnops.c
RevisionDateAuthorComments
 1.174  27-Mar-2022  christos dedup the eofs link/symlink methods
 1.173  12-Mar-2022  riastradh kernfs: Just fail with EOPNOTSUPP, don't panic, on VOP_BMAP.

Reported-by: syzbot+870d2eb4b4c8904ac734@syzkaller.appspotmail.com
 1.172  19-Jul-2021  dholland Abolish all the silly indirection macros for initializing vnode ops tables.

These are things of the form #define foofs_op genfs_op, or #define
foofs_op genfs_eopnotsupp, or similar. They serve no purpose besides
obfuscation, and have gotten cutpasted all over everywhere.

Part 3; cvs randomly didn't commit all the files the first time, still
hunting down the files it skipped.
 1.171  18-Jul-2021  dholland Use macros for the canned parts of device and fifo vnode op tables.

Add GENFS_SPECOP_ENTRIES and GENFS_FIFOOP_ENTRIES macros that contain
the portion of the vnode ops table declaration that is
(conservatively) the same in every fs. Use these in every fs that
supports devices and/or fifos with separate ops tables.

Note that ptyfs works differently (it has one type of vnode with
open-coded dispatch to the specfs code, which I haven't changed in
this commit) and rump/librump/rumpvfs/rumpfs.c has an indirect dynamic
dispatch that already does more or less the same thing, which I also
haven't changed.

Also note that this anticipates a few bits in the next changeset here
and there, and adds missing but unreachable calls in some cases (e.g.
most fses weren't defining whiteout on devices and fifos, but it isn't
reachable there), and it changes parsepath on devices and fifos to
genfs_badop from genfs_parsepath (but it's not reachable there
either).

It appears that devices in kernfs were missing kqfilter, so it's
possible that if you try to use kqueue on /kern/rootdev that it'll
explode.

And finally note that the ops declaration tables aren't
order-dependent. (Other than vop_default_desc has to come first.)
Otherwise this wouldn't work.
 1.170  06-Jul-2021  dholland Fix perms on /kern/{r,}rootdev.
 1.169  06-Jul-2021  dholland Add missing VOP_KQFILTER to kernfs.

Not sure if lack of it can be used for local DoS or not, but best to
fix.
 1.168  29-Jun-2021  dholland - Add a new vnode op: VOP_PARSEPATH.
- Move namei_getcomponent to genfs_vnops.c and call it genfs_parsepath.
- Add a parsepath entry to every vnode ops table.

VOP_PARSEPATH takes a directory vnode to be searched and a complete
following path and chooses how much of that path to consume. To begin
with, all parsepath calls are genfs_parsepath, which locates the first
'/' as always.

Note that the call doesn't take the whole struct componentname, only
the string. The other bits of struct componentname should not be
needed and there's no reason to cause potential complications by
exposing them.
 1.167  28-Jun-2021  chs VOP_BMAP() may be called via ioctl(FIOGETBMAP) on any vnode that applications
can open. change various pseudo-fs *_bmap methods return an error instead of
panic.

Reported-by: syzbot+8289a3eaf2ba60958c87@syzkaller.appspotmail.com
 1.166  27-Jun-2020  christos branches: 1.166.6;
Introduce genfs_pathconf() and use it for the default case in all filesystems.
 1.165  16-May-2020  christos Add ACL support for FFS. From FreeBSD.
 1.164  24-Feb-2020  ad v_interlock -> vmobjlock
 1.163  04-Feb-2020  riastradh Use specfs vnops for specnodes in kernfs.

While here, don't filter out rootdev and rrootdev merely because
they're not cached.

Fixes the elusive /kern/rootdev and /kern/rrootdev nodes, which only
appeared sometimes when they felt like it, and fixes operations on
/kern/rootdev and /kern/rrootdev always returning EOPNOTSUPP.

We didn't seem to have a single PR for these issues but the following
PRs are all relevant:

PR bin/13564
PR kern/38265
PR kern/38778
PR kern/45974

XXX pullup-9, pullup-8, pullup-7, pullup-6, pullup-5, pullup-4, pullup-3, pullup-2, pullup-1.4T...
 1.162  02-Jan-2020  thorpej branches: 1.162.2;
- Eliminate the global "boottime" variable, which was being accessed
without any synchronization against changes by e.g. clock_settime().
- Replace with new getbinboottime() / getnanoboottime() / getmicroboottime()
functions (naming mirrors that of other time access functions in kern_tc.c).
It returns the (maybe-converted) value of timebasebin, which also tracks
our estimate of when the system was booted (i.e. the legacy "boottime" was
redundant).

XXX There needs to be a lockless synchronization mechanism for reading
timebasebin, but this is a problem in kern_tc.c that pre-existed these
"boottime" changes. At least now the problem is centralized in one location.
 1.161  29-Aug-2019  hannken Add missing operation VOP_GETPAGES() returning EFAULT.

Without this operation posix_fadvise(..., POSIX_FADV_WILLNEED)
would leave the v_interlock held.

Observed by maxv@
 1.160  03-Sep-2018  riastradh branches: 1.160.4;
Rename min/max -> uimin/uimax for better honesty.

These functions are defined on unsigned int. The generic name
min/max should not silently truncate to 32 bits on 64-bit systems.
This is purely a name change -- no functional change intended.

HOWEVER! Some subsystems have

#define min(a, b) ((a) < (b) ? (a) : (b))
#define max(a, b) ((a) > (b) ? (a) : (b))

even though our standard name for that is MIN/MAX. Although these
may invite multiple evaluation bugs, these do _not_ cause integer
truncation.

To avoid `fixing' these cases, I first changed the name in libkern,
and then compile-tested every file where min/max occurred in order to
confirm that it failed -- and thus confirm that nothing shadowed
min/max -- before changing it.

I have left a handful of bootloaders that are too annoying to
compile-test, and some dead code:

cobalt ews4800mips hp300 hppa ia64 luna68k vax
acorn32/if_ie.c (not included in any kernels)
macppc/if_gm.c (superseded by gem(4))

It should be easy to fix the fallout once identified -- this way of
doing things fails safe, and the goal here, after all, is to _avoid_
silent integer truncations, not introduce them.

Maybe one day we can reintroduce min/max as type-generic things that
never silently truncate. But we should avoid doing that for a while,
so that existing code has a chance to be detected by the compiler for
conversion to uimin/uimax without changing the semantics until we can
properly audit it all. (Who knows, maybe in some cases integer
truncation is actually intended!)
 1.159  31-Mar-2018  christos branches: 1.159.2;
factor out some repeated code and simplify the logputchar function.
 1.158  26-May-2017  riastradh branches: 1.158.2; 1.158.8;
Make VOP_RECLAIM do the last unlock of the vnode.

VOP_RECLAIM naturally has exclusive access to the vnode, so having it
locked on entry is not strictly necessary -- but it means if there
are any final operations that must be done on the vnode, such as
ffs_update, requiring exclusive access to it, we can now kassert that
the vnode is locked in those operations.

We can't just have the caller release the last lock because some file
systems don't use genfs_lock, and require the vnode to remain valid
for VOP_UNLOCK to work, notably unionfs.
 1.157  11-Apr-2017  riastradh Make VOP_INACTIVE preserve vnode lock on return.

Discussed on tech-kern:
https://mail-index.netbsd.org/tech-kern/2017/04/01/msg021751.html

Ride 7.99.68, a bumpy bus of incremental vfs improvements!
 1.156  20-Aug-2016  hannken branches: 1.156.2;
Remove now obsolete operation vcache_remove().

Welcome to 7.99.36
 1.155  20-Apr-2015  riastradh branches: 1.155.2;
Make VOP_LINK return directory still locked and referenced.

Ride 7.99.10 bump.
 1.154  25-Jul-2014  dholland branches: 1.154.2; 1.154.4; 1.154.6; 1.154.10;
Add VOP_FALLOCATE and VOP_FDISCARD to every vnode ops table I can
find.

The filesystem ones all call genfs_eopnotsupp - right now I am only
implementing the plumbing and we can implement fallocate and/or
fdiscard for files later.

The device ones call spec_fallocate (which is also genfs_eopnotsupp)
and spec_fdiscard, which dispatches to the device-level op.

The fifo ones all call vn_fifo_bypass, which also ends up being
EOPNOTSUPP.
 1.153  20-Jul-2014  hannken Change kernfs from hashlist to vcache.
 1.152  17-Jul-2014  hannken Finish KAME IPSEC removal:
- Remove field kfs_value, it is always zero. Compute the hash from kt_tag.
- Remove stray definitions kernfs_revoke_sa and kernfs_revoke_sp.

While here, remove kfs_type from allocvp(), it is always kt->kt_tag.
 1.151  08-Apr-2014  christos From Ilya Zykov: Unbreak kernfs which was broken by this commit

|Make the spec_node table implementation private to spec_vnops.c.
|To retrieve a spec_node, two new lookup functions (by device or by mount)
|are implemented. Both return a referenced vnode, for an opened block device
|the opened vnode is returned so further diagnostic checks "vp == ... sd_bdevvp"
|will not fire. Otherwise any vnode matching the criteria gets returned.
|No objections on tech-kern.

The effect was that ls /kernfs appeared empty in most cases.
 1.150  07-Feb-2014  hannken branches: 1.150.2;
Change vnode operation lookup to return the resulting vnode *vpp unlocked.
Change cache_lookup() to return an unlocked vnode.

Discussed on tech-kern@

Welcome to 6.99.31
 1.149  23-Jan-2014  hannken Change vnode operations create, mknod, mkdir and symlink to return
the resulting vnode *vpp unlocked.

Discussed on tech-kern@

Welcome to 6.99.30
 1.148  17-Jan-2014  hannken Change vnode operations create, mknod, mkdir and symlink to keep the
directory node dvp locked on return.

Discussed on tech-kern@

Welcome to 6.99.29
 1.147  18-Mar-2013  plunky branches: 1.147.6;
C99 section 6.7.2.3 (Tags) Note 3 states that:

A type specifier of the form

enum identifier

without an enumerator list shall only appear after the type it
specifies is complete.

which means that we cannot pass an "enum vtype" argument to
kauth_access_action() without fully specifying the type first.
Unfortunately there is a complicated include file loop which
makes that difficult, so convert this minimal function into a
macro (and capitalize it).

(ok elad@)
 1.146  22-Mar-2012  drochner branches: 1.146.2;
remove KAME IPSEC, replaced by FAST_IPSEC
 1.145  13-Mar-2012  elad Replace the remaining KAUTH_GENERIC_ISSUSER authorization calls with
something meaningful. All relevant documentation has been updated or
written.

Most of these changes were brought up in the following messages:

http://mail-index.netbsd.org/tech-kern/2012/01/18/msg012490.html
http://mail-index.netbsd.org/tech-kern/2012/01/19/msg012502.html
http://mail-index.netbsd.org/tech-kern/2012/02/17/msg012728.html

Thanks to christos, manu, njoly, and jmmv for input.

Huge thanks to pgoyette for spinning these changes through some build
cycles and ATF.
 1.144  12-Dec-2011  njoly branches: 1.144.2;
Start making fs read(2) fail with EISDIR if the implementation does
not allow read on directories (kernfs, rumpfs, ptyfs and sysvbfs).
Adjust man page accordingly, and add a small corresponding vfs
testcase.
 1.143  21-Jul-2010  hannken branches: 1.143.8; 1.143.12;
Using vfinddev() leads to vnode races as it returns an unreferenced
vnode that may disappear before the caller has a chance to reference it.

Reference the vnode while the specfs cache is locked.

Welcome to 5.99.37.

No objections on tech-kern.
 1.142  24-Jun-2010  hannken Clean up vnode lock operations pass 2:

VOP_UNLOCK(vp, flags) -> VOP_UNLOCK(vp): Remove the unneeded flags argument.

Welcome to 5.99.32.

Discussed on tech-kern.
 1.141  31-Mar-2010  pooka If msgbuf is not enabled, do not report the node in readdir. That
way ls -l won't report funny errors because getattr for a readdir
result fails.

XXX: lookup for msgbuf still succeeds even if not enabled
 1.140  22-Jan-2010  njoly branches: 1.140.2; 1.140.4;
Remove unneeded strlen() call in KFShostname case.
 1.139  08-Jan-2010  pooka The VATTR_NULL/VREF/VHOLD/HOLDRELE() macros lost their will to live
years ago when the kernel was modified to not alter ABI based on
DIAGNOSTIC, and now just call the respective function interfaces
(in lowercase). Plenty of mix'n match upper/lowercase has creeped
into the tree since then. Nuke the macros and convert all callsites
to lowercase.

no functional change
 1.138  03-Jul-2009  elad Where possible, extract the file-system's access() routine to two internal
functions: the first checking if the operation is possible (regardless of
permissions), the second checking file-system permissions, ACLs, etc.

Mailing list reference:

http://mail-index.netbsd.org/tech-kern/2009/06/21/msg005311.html
 1.137  23-Jun-2009  elad Move the implementation of vaccess() to genfs_can_access(), in line with
the other routines of the same spirit.

Adjust file-system code to use it.

Keep vaccess() for KPI compatibility and to keep element of least
surprise. A "diagnostic" message warning that vaccess() is deprecated will
be printed when it's used (obviously, only in DIAGNOSTIC kernels).

No objections on tech-kern@:

http://mail-index.netbsd.org/tech-kern/2009/06/21/msg005310.html
 1.136  14-Mar-2009  dsl Change about 4500 of the K&R function definitions to ANSI ones.
There are still about 1600 left, but they have ',' or /* ... */
in the actual variable definitions - which my awk script doesn't handle.
There are also many that need () -> (void).
(The script does handle misordered arguments.)
 1.135  11-Jan-2009  christos branches: 1.135.2;
merge christos-time_t
 1.134  02-Jan-2008  ad branches: 1.134.6; 1.134.8; 1.134.12; 1.134.20;
Merge vmlocking2 to head.
 1.133  26-Nov-2007  pooka branches: 1.133.2; 1.133.6;
Remove the "struct lwp *" argument from all VFS and VOP interfaces.
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
 1.132  28-Dec-2006  elad branches: 1.132.6; 1.132.18; 1.132.20; 1.132.26;
Revert bogus NULL check introduced in revision 1.96 that generated false
Coverity "bugs".
 1.131  28-Dec-2006  alc revert previous, after inspection `kfs->kfs_kt' could really not be NULL here.

reported/requested by elad@
 1.130  26-Dec-2006  alc CID-3855: check if 'kfs->kfs_kt != NULL' before dereferencing it
 1.129  09-Dec-2006  chs a smorgasbord of improvements to vnode locking and path lookup:
- LOCKPARENT is no longer relevant for lookup(), relookup() or VOP_LOOKUP().
these now always return the parent vnode locked. namei() works as before.
lookup() and various other paths no longer acquire vnode locks in the
wrong order via vrele(). fixes PR 32535.
as a nice side effect, path lookup is also up to 25% faster.
- the above allows us to get rid of PDIRUNLOCK.
- also get rid of WANTPARENT (just use LOCKPARENT and unlock it).
- remove an assumption in layer_node_find() that all file systems implement
a recursive VOP_LOCK() (unionfs doesn't).
- require that all file systems supply vfs_vptofh and vfs_fhtovp routines.
fill in eopnotsupp() for file systems that don't support being exported
and remove the checks for NULL. (layerfs calls these without checking.)
- in union_lookup1(), don't change refcounts in the ISDOTDOT case, just
adjust which vnode is locked. fixes PR 33374.
- apply fixes for ufs_rename() from ufs_vnops.c rev. 1.61 to ext2fs_rename().
 1.128  16-Nov-2006  christos branches: 1.128.2;
__unused removal on arguments; approved by core.
 1.127  04-Nov-2006  jmmv Use size_t in a couple of places as it makes more sense WRT the places
where the variables are later used. From PR kern/25277 by Jeff Ito.
 1.126  12-Oct-2006  christos - sprinkle __unused on function decls.
- fix a couple of unused bugs
- no more -Wno-unused for i386
 1.125  23-Jun-2006  christos branches: 1.125.4; 1.125.6;
remove useless genop
 1.124  23-Jun-2006  bouyer For internal types call kernfs_default_xread() directly, as no entry in
the splay tree has been added for these types. Fix kern/33797 by
Geoff C. Wing.
While here also fix writes the same way (probably broken for 2 years),
and properly implement KERNFS_XREAD.
The IPsec code could probably be moved out now, and use kernfs_alloctype().
 1.123  23-Jun-2006  bouyer Backout previous: of course the change
"Allow optional /kern regular files to have custom read methods..."
works, it's used by Xen.
 1.122  23-Jun-2006  christos PR/33797: Geoff C. Wing: kernfs files are not supplying information
Roll back the change:
'Allow optional /kern regular files to have custom read methods...'
which does not work.
 1.121  07-Jun-2006  kardel branches: 1.121.2;
merge FreeBSD timecounters from branch simonb-timecounters
- struct timeval time is gone
time.tv_sec -> time_second
- struct timeval mono_time is gone
mono_time.tv_sec -> time_uptime
- access to time via
{get,}{micro,nano,bin}time()
get* versions are fast but less precise
- support NTP nanokernel implementation (NTP API 4)
- further reading:
Timecounter Paper: http://phk.freebsd.dk/pubs/timecounter.pdf
NTP Nanokernel: http://www.eecis.udel.edu/~mills/ntp/html/kern.html
 1.120  14-May-2006  elad branches: 1.120.2;
integrate kauth.
 1.119  04-Apr-2006  christos Coverity CID 1087: Clarify NULL test.
 1.118  14-Mar-2006  bouyer branches: 1.118.2;
Allow optionnal /kern regular files to have custom read methods, the same
way writes are handled: Add KERNFS_XREAD and KERNFS_FILEOP_WRITE files
operations definitions to kfsfileop, a xread function pointer to
kernfs_fileop, rename kernfs_read to kernfs_default_xread and add a
kernfs_read calling kernfs_try_fileop(KERNFS_FILEOP_READ).

Proposed on tech-kern on Feb 18 2006.
 1.117  01-Mar-2006  yamt branches: 1.117.2; 1.117.4;
merge yamt-uio_vmspace branch.

- use vmspace rather than proc or lwp where appropriate.
the latter is more natural to specify an address space.
(and less likely to be abused for random purposes.)
- fix a swdmover race.
 1.116  24-Dec-2005  perry branches: 1.116.2; 1.116.4; 1.116.6;
Remove leading __ from __(const|inline|signed|volatile) -- it is obsolete.
 1.115  11-Dec-2005  christos merge ktrace-lwp.
 1.114  23-Nov-2005  christos Fix 64 bit truncation problem reported by http://www.securitylab.net
 1.113  02-Nov-2005  yamt branches: 1.113.2;
merge yamt-vop branch. remove following VOPs.

VOP_BLKATOFF
VOP_VALLOC
VOP_BALLOC
VOP_REALLOCBLKS
VOP_VFREE
VOP_TRUNCATE
VOP_UPDATE
 1.112  01-Sep-2005  christos branches: 1.112.2;
Also protect the ipsec ioctls from negative offsets to prevent panics
in m_copydata(). Pointed out by Karl Janmar. Move the negative offset
check from kernfs_xread() to kernfs_read().
 1.111  31-Aug-2005  christos Don't allow negative offsets when reading the message buffer, because it
can allow reading arbitrary kernel memory.
 1.110  30-Aug-2005  xtraeme Remove __P()
 1.109  29-May-2005  christos branches: 1.109.2;
- sprinkle const
- avoid shadowed variables.
 1.108  20-May-2005  chs kernfs does not support mmap(), remove code that pretends that it does.
 1.107  26-Feb-2005  perry branches: 1.107.2;
nuke trailing whitespace
 1.106  27-Oct-2004  skrll branches: 1.106.4; 1.106.6;
Backout previous.
 1.105  27-Oct-2004  skrll Don't pass &proc0 in the UIO_SYSSPACE case it is not needed.
 1.104  13-May-2004  cl Workaround for gcc 2.95.3 failing to initialize structures
and/or unions inside structures using nested designators.
Should be reverted when gcc >=3.3.3 is ready for vax.
 1.103  12-May-2004  jrf caddr_t -> void * and removal of some more casts.
 1.102  07-May-2004  cl Allow additional entries (files, subdirs) in kernfs. Also allow
defining additional kfstypes and provide hooks to run arbitrary code
for any vnodeop on the additional types.
 1.101  07-May-2004  cl Make lookup and readdir return the same inode number. kernfs_readdir
now uses kernfs_allocvp to map from kernfs entry to inode number,
kernfs_allocvp is now the only place where entries are mapped to inode
numbers. Also make KERNFS_FILENO not return random results for entries
not in kern_targets.
 1.100  07-May-2004  cl Find the right entry when doing lookup on dotdot in kern/ipsec subdirs.
Also remove some duplicate code.
 1.99  29-Apr-2004  jrf Removed remaining caddr_t casts we do not need in miscfs. Recompiled
kernel and ran for a day or so. There are still some caddr_t types in
the arguments of some calls, I will do those separately (later) as
they touch a lot more of the system.
Approved by christos@NetBSD.org.
 1.98  27-Sep-2003  darcy branches: 1.98.2;
Changes as discussed with itojun on tech-kern. I have modified the enums
to have KFS or PFS differentiators. Further I have wrapped the enum in
procfs in "#ifdef _KERNEL" as it is done in kernfs.

To see the discussion go to http://mail-index.NetBSD.org/tech-kern/2003/09/
and look for "Mismatched enums in include files" in the list.
 1.97  26-Sep-2003  atatat Make kernfs peacefully co-exist with procfs.
 1.96  10-Sep-2003  itojun check before deref kfs_kt
 1.95  10-Sep-2003  dan Make /kern/. have linkcount 2 in non-IPSEC case, 4 in IPSEC case.
Thanks to Valeriy E. Ushakov.
 1.94  10-Sep-2003  itojun check if rootdev/rrootdev actually exists.
 1.93  10-Sep-2003  simonb 8 spaces is evil, convert to tab.
 1.92  10-Sep-2003  dan Make vnode times on /kern/boottime be the boot time, not "now".

Handy because ls(1) helpfully converts the time to human-readable
format when printing, and because shell tools like "test -nt" and
"find -newer" can be used against it.

"Inspired" by a discussion about removing lockfiles older than the
last reboot, and Al Crooks' handy observation that a close
approximation can be found with /var/run/dmesg.boot

While here, notice that a lot of the kernfs structures and naming
changed suddenly, and though it seems a clear improvement, there was no
mention in commit logs.
 1.91  08-Sep-2003  itojun remove non-precise comment
 1.90  08-Sep-2003  itojun add /kern/ipsecsa and /kern/ipsecsp, which can be inspected by setkey(8).
it allows easier access to ipsecsa/sp. it works around problem where
setkey -D does not work with large number of ipsec SAs due to socket buffer
size.
 1.89  07-Aug-2003  agc Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22364, verified by myself.
 1.88  29-Jun-2003  fvdl branches: 1.88.2;
Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.
 1.87  29-Jun-2003  thorpej Undo part of the ktrace/lwp changes. In particular:
* Remove the "lwp *" argument that was added to vget(). Turns out
that nothing actually used it!
* Remove the "lwp *" arguments that were added to VFS_ROOT(), VFS_VGET(),
and VFS_FHTOVP(); all they did was pass it to vget() (which, as noted
above, didn't use it).
* Remove all of the "lwp *" arguments to internal functions that were added
just to appease the above.
 1.86  28-Jun-2003  darrenr Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records. The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V
 1.85  10-Apr-2003  jdolecek use former genfs_eopnotsupp_rele() as genfs_eopnotsupp(), so that vnodes
are vput()/vrele()d as necessary - some filesystems did use the wrong
one for some ops, and it's just safer to not take the chance

based on suggestion by Bill Studenmund
 1.84  12-Oct-2002  jdolecek put back the while loop in kernfs_getattr() removed in rev 1.82; it's
necessary to get the whole file length e.g. for msgbuf

this fixes the '/kern/msgbuf & less' problem reported on port-i386
by Dave Tyson
 1.83  03-Aug-2002  simonb Just use the "time" variable in the *_getattr functions instead of a call
to (the potentially expensive) microtime().
 1.82  19-Jul-2002  jdolecek Properly detect error in kernfs_xread().
Fixes kern/10278 by IWAMOTO Toshihiro, though implemented different way.

While here, clean up some int vs. size_t confusion, make
kernfs_x{read|write}() static and g/c some #if 0 stuff.
 1.81  05-Jul-2002  lukem be consistent about how va_[acm]time is set to the current time
(inspired by how procfs does it)
 1.80  05-Jul-2002  lukem set vap->va_ctime to vap->va_atime (the current time),
rather than vap->va_ctime (which is a no-op).
 1.79  06-Dec-2001  chs branches: 1.79.8; 1.79.10;
add a VOP_PUTPAGES method for all the filesystems that don't have pages,
just unlock the interlock.
 1.78  15-Nov-2001  lukem don't need <sys/types.h> when including <sys/param.h>
 1.77  10-Nov-2001  lukem add RCSIDs
 1.76  03-Jun-2001  chs branches: 1.76.2; 1.76.6;
let kernfs_mmap() use the default error method.
 1.75  21-Feb-2001  jdolecek branches: 1.75.2;
make some more constant arrays 'const'
 1.74  04-Feb-2001  mrg clean up some KERNFS_DIAGNOSTIC calls.
 1.73  27-Jan-2001  jdolecek Back previous out, it was right the way it was. Seems like I should
attend some basic arithmetic lessons to avoid such mistakes :-/
 1.72  27-Jan-2001  jdolecek fix 'physmem' - the actual value we want is ctob(physmem)
 1.71  22-Jan-2001  jdolecek make filesystem vnodeop, specop, fifoop and vnodeopv_* arrays const
 1.70  03-Aug-2000  thorpej MALLOC()/FREE() are not to be used for variable sized allocations.
 1.69  14-Jul-2000  thorpej Sprinkle some const.
 1.68  28-Jun-2000  mrg <vm/vm.h> -> <uvm/uvm_extern.h>
 1.67  25-Aug-1999  sommerfeld branches: 1.67.2; 1.67.8; 1.67.12;
Change variable used for directory offset from "int" to "off_t".
Overkill, but avoids a host of truncation problems.
 1.66  24-Aug-1999  sommerfeld Fix PR8270:

Problem turned out to be due to improper handling of reads beyond EOF:
they should just return without error with the uio unchanged, and the
caller will recognize this as a zero-byte return (EOF).

The previous fix to protect directory reads against bogus uio_offset
values returned EINVAL, which broke mount -o union, which only
union'ed in the lower directory if the upper directory cleanly
returned EOF.

While we're here, protect kernfs as well.
 1.65  03-Aug-1999  wrstuden Add support for fcntl(2) to generate VOP_FCNTL calls. Any fcntl
call with F_FSCTL set and F_SETFL calls generate calls to a new
fileop fo_fcntl. Add genfs_fcntl() and soo_fcntl() which return 0
for F_SETFL and EOPNOTSUPP otherwise. Have all leaf filesystems
use genfs_fcntl().

Reviewed by: thorpej
Tested by: wrstuden
 1.64  08-Jul-1999  wrstuden Bump osrelease to 1.4E. Add layerfs files, remove null_subr.c.

Update coda to new struct lock in struct vnode.

make fdescfs, kernfs, portalfs, and procfs actually lock their vnodes.
It's not that hard.

Make unionfs set v_vnlock = NULL so any overlayed fs will call its
VOP_LOCK.
 1.63  24-Mar-1999  mrg branches: 1.63.2; 1.63.4;
completely remove Mach VM support. all that is left is the all the
header files as UVM still uses (most of) these.
 1.62  13-Aug-1998  kleink Per POSIX, fail with EINVAL if advisory locking is attempted on a file type
that doesn't support it, rather than using a homegrown EBADF or EOPNOTSUPP.
 1.61  10-Aug-1998  matthias create miscfs/genfs/genfs_vnops.c:genfs_enoioctl and make all the other
filesystems use it instead of a private version.
 1.60  09-Aug-1998  perry bzero->memset, bcopy->memcpy, bcmp->memcmp
 1.59  03-Aug-1998  kleink Recognize _PC_SYNC_IO.
 1.58  08-Mar-1998  mrg standardise options header includes.
 1.57  01-Mar-1998  fvdl Merge with Lite2 + local changes
 1.56  12-Feb-1998  thorpej Don't include option headers if building an LKM.
 1.55  10-Feb-1998  mrg - add defopt's for UVM, UVMHIST and PMAP_NEW.
- remove unnecessary UVMHIST_DECL's.
 1.54  05-Feb-1998  mrg initial import of the new virtual memory system, UVM, into -current.

UVM was written by chuck cranor <chuck@maria.wustl.edu>, with some
minor portions derived from the old Mach code. i provided some help
getting swap and paging working, and other bug fixes/ideas. chuck
silvers <chuq@chuq.com> also provided some other fixes.

this is the rest of the MI portion changes.

this will be KNF'd shortly. :-)
 1.53  10-Oct-1997  fvdl Bump last argument to VOP_READDIR to off_t (from u_long).
 1.52  19-Sep-1997  leo Implement the kernel part of pr-1891. This allows for a more flexible sized
msgbuf. Note that old 'dmesg' and 'syslogd' binaries will continue running,
though old 'dmesg' binaries will output a few bytes of junk at the start of
the buffer, and will miss a few bytes at the end of the buffer.
 1.51  10-Sep-1997  christos PR/4098: Alan Barrett: Fix diagnostic printf formatting.
 1.50  10-May-1997  pk branches: 1.50.4;
Move `struct kern_target' definition into kernfs.h
 1.49  08-May-1997  mycroft Pass the vnode type to vaccess(), and use it when checking VEXEC. Make sure
that the mode bits passed to vaccess() and returned by foo_getattr() contain
only permission bits.
 1.48  25-Oct-1996  cgd define path name string variables that we should not (and, thankfully, do
not) modify as 'const char *' rather 'char *'.
 1.47  13-Oct-1996  christos backout previous kprintf changes
 1.46  10-Oct-1996  christos printf -> kprintf, sprintf -> ksprintf
 1.45  07-Sep-1996  mycroft Implement poll(2).
 1.44  01-Sep-1996  mycroft Add a set of generic file system operations that most file systems use.
Also, fix some time stamp bogosities.
 1.43  16-Mar-1996  christos Fix printf format follies.
 1.42  13-Feb-1996  mycroft GC *_nullop(). Minor nits.
 1.41  09-Feb-1996  christos miscfs prototype changes
 1.40  09-Feb-1996  mycroft Fix vop_link, vop_symlink, and vop_remove semantics in several ways:
* Change the argument names to vop_link so they actually make sense.
* Implement vop_link and vop_symlink for all file systems, so they do proper
cleanup.
* Require the file system to decide whether or not linking and unlinking of
directories is allowed, and disable it for all current file systems.
 1.39  09-Oct-1995  mycroft Fix the inode calculation in kernfs_getattr().
 1.38  09-Oct-1995  mycroft Use the index number as the cookie, rather than multiplying by UIO_MX.
 1.37  09-Oct-1995  mycroft Add support for cookies, mostly from Greg Hudson.
 1.36  15-Apr-1995  cgd fix timeval vs. timespec warnings
 1.35  03-Feb-1995  mycroft Return EROFS rather than ENOENT in many cases. Also some cosmetic cleanup.
 1.34  27-Dec-1994  mycroft Format police.
 1.33  24-Dec-1994  ws Implement and use a common access checking routine
 1.32  14-Dec-1994  mycroft Remove a_fp.
 1.31  01-Dec-1994  mycroft Make sure averunnable.fscale is filled before using it.
 1.30  14-Nov-1994  christos fixed struct comment
 1.29  20-Oct-1994  cgd update for new syscall args description mechanism
 1.28  21-Jul-1994  mycroft Implement /kern/msgbuf.
 1.27  29-Jun-1994  cgd branches: 1.27.2;
New RCS ID's, take two. they're more aesthecially pleasant, and use 'NetBSD'
 1.26  15-Jun-1994  mycroft Minor update from JSP after merging my changes.
 1.25  15-Jun-1994  mycroft Deal with silly DIAGNOSTIC check.
 1.24  15-Jun-1994  mycroft Use vget() for devices.
 1.23  08-Jun-1994  mycroft Update to 4.4-Lite fs code, with local changes.
 1.22  17-May-1994  mycroft Really fix the file size problem.
 1.21  17-May-1994  cgd actually set va_size!
 1.20  14-Feb-1994  ws Add .. entry to /kern
 1.19  11-Feb-1994  cgd don't give bogus return code from read()
 1.18  09-Feb-1994  cgd don't panic if user does 'cat /kern', though result is dubious.
 1.17  05-Jan-1994  cgd update with latest kernfs file system from jsp@sequent.com
 1.16  22-Dec-1993  cgd fix return type of vnode print routine
 1.15  20-Dec-1993  cgd branches: 1.15.2;
pull load average and misc changes down from magnum
 1.14  18-Dec-1993  mycroft Canonicalize all #includes.
 1.13  20-Nov-1993  cgd #ifdef out /kern/root at theo's request
 1.12  07-Sep-1993  ws branches: 1.12.2;
Changes to VFS readdir semantics
NFS changes for better cookie support
ISOFS changes for better Rockridge support and support for generation numbers
 1.11  02-Aug-1993  mycroft Make kernfs_print have a return type of void.
 1.10  07-Jun-1993  cgd give various filesystems their own vnode types
 1.9  28-May-1993  cgd add some more functionality: a setattr which supports chmod+chown+chgrp,
and the various support elsewhere to deal with it.
 1.8  28-May-1993  cgd add kernfs_access function, to kill kernfs security hole
 1.7  20-May-1993  cgd header cleanup
 1.6  27-Apr-1993  cgd fix several off-by-one errors in hostname setting/reading
 1.5  27-Apr-1993  mycroft Use EPERM when write permission is denied, not EBADF.
 1.4  27-Mar-1993  cgd added ".." and support for "rrootdev"
 1.3  25-Mar-1993  cgd fixed problem where you couldn't unmount after looking...
 1.2  25-Mar-1993  cgd changed copyright notice thanks to following statement:

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From: jsp@compnews.co.uk (Jan-Simon Pendry)
Date: Thu, 25 Mar 1993 13:37:05 +0100
In-Reply-To: cgd@postgres.berkeley.edu's message as of Mar 25, 5:32am.
Phone-Number-1: +44 430 432450
Phone-Number-2: +44 430 432480 x20
Fax-Number: +44 430 432022
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To: cgd@postgres.berkeley.edu
Subject: Re: fdesc/kernfs/etc code...

You may put this copyright message on the source code:

/*
* Copyright (c) 1990, 1992 Jan-Simon Pendry
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Jan-Simon Pendry.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
 1.1  23-Mar-1993  cgd branches: 1.1.1;
files which implement the kern filesystem. from Jan-Simon Pendry,
pendry@vangogh.cs.berkeley.edu
 1.1.1.2  01-Mar-1998  fvdl Import 4.4BSD-Lite2
 1.1.1.1  01-Mar-1998  fvdl Import 4.4BSD-Lite for reference
 1.12.2.4  29-Nov-1993  mycroft Don't crash deferencing a null pointer if the raw root device was not found.
 1.12.2.3  20-Nov-1993  cgd update from trunk
 1.12.2.2  14-Nov-1993  mycroft Canonicalize all #includes.
 1.12.2.1  24-Sep-1993  mycroft kernfs_vnops: averunnable changes.
 1.15.2.3  06-Jan-1994  pk Re-instate EOPNOTSUPP
 1.15.2.2  28-Dec-1993  pk Use ENODEV rather then EOPNOTSUP for unsupported operations on non-socket devices
 1.15.2.1  20-Dec-1993  pk file kernfs_vnops.c was added on branch magnum on 1993-12-28 16:35:19 +0000
 1.27.2.1  22-Jul-1994  cgd from trunk.
 1.50.4.3  14-Oct-1997  thorpej Update marc-pcmcia branch from trunk.
 1.50.4.2  22-Sep-1997  thorpej Update marc-pcmcia branch from trunk.
 1.50.4.1  16-Sep-1997  thorpej Update marc-pcmcia branch from trunk.
 1.63.4.1  02-Aug-1999  thorpej Update from trunk.
 1.63.2.1  28-Aug-1999  he Pull up revisions 1.66-1.67:
Protect {fdesc,kernfs,procfs}_readdir against directory seeks
with bogus offsets. (sommerfeld)
 1.67.12.1  14-Jul-2000  thorpej Update from trunk:
Sprinkle some const.
 1.67.8.1  21-Dec-1999  wrstuden Initial commit of recent changes to make DEV_BSIZE go away.

Runs on i386, needs work on other arch's. Main kernel routines should be
fine, but a number of the stand programs need help.

cd, fd, ccd, wd, and sd have been updated. sd has been tested with non-512
byte block devices. vnd, raidframe, and lfs need work.

Non 2**n block support is automatic for LKM's and conditional for kernels
on "options NON_PO2_BLOCKS".
 1.67.2.3  12-Mar-2001  bouyer Sync with HEAD.
 1.67.2.2  11-Feb-2001  bouyer Sync with HEAD.
 1.67.2.1  20-Nov-2000  bouyer Update thorpej_scsipi to -current as of a month ago
 1.75.2.6  18-Oct-2002  nathanw Catch up to -current.
 1.75.2.5  13-Aug-2002  nathanw Catch up to -current.
 1.75.2.4  01-Aug-2002  nathanw Catch up to -current.
 1.75.2.3  08-Jan-2002  nathanw Catch up to -current.
 1.75.2.2  14-Nov-2001  nathanw Catch up to -current.
 1.75.2.1  21-Jun-2001  nathanw Catch up to -current.
 1.76.6.1  12-Nov-2001  thorpej Sync the thorpej-mips-cache branch with -current.
 1.76.2.2  06-Sep-2002  jdolecek sync kqueue branch with HEAD
 1.76.2.1  10-Jan-2002  thorpej Sync kqueue branch with -current.
 1.79.10.3  29-Nov-2005  tron Pull up following revision(s) (requested by christos in ticket #5952):
sys/miscfs/kernfs/kernfs_vnops.c: revision 1.114 via patch
Fix 64 bit truncation problem reported by http://www.securitylab.net
 1.79.10.2  14-Oct-2002  lukem Pull up revision 1.84 (requested by jdolecek in ticket #911):
put back the while loop in kernfs_getattr() removed in rev 1.82; it's
necessary to get the whole file length e.g. for msgbuf
this fixes the '/kern/msgbuf & less' problem reported on port-i386
by Dave Tyson
 1.79.10.1  21-Jul-2002  lukem Pull up revision 1.82 (requested by jdolocek in ticket #526):
Properly detect error in kernfs_xread().
Fixes kern/10278 by IWAMOTO Toshihiro, though implemented different way.
While here, clean up some int vs. size_t confusion, make
kernfs_x{read|write}() static and g/c some #if 0 stuff.
 1.79.8.3  29-Aug-2002  gehenna catch up with -current.
 1.79.8.2  20-Jul-2002  gehenna catch up with -current.
 1.79.8.1  15-Jul-2002  gehenna catch up with -current.
 1.88.2.10  11-Dec-2005  christos Sync with head.
 1.88.2.9  10-Nov-2005  skrll Sync with HEAD. Here we go again...
 1.88.2.8  04-Mar-2005  skrll Sync with HEAD.

Hi Perry!
 1.88.2.7  31-Oct-2004  skrll Reduce diff to HEAD.
 1.88.2.6  27-Oct-2004  skrll Fix various comments that describe the argument structures
 1.88.2.5  21-Sep-2004  skrll Fix the sync with head I botched.
 1.88.2.4  18-Sep-2004  skrll Sync with HEAD.
 1.88.2.3  24-Aug-2004  skrll Undo part of the ktrace/lwp changes. In particular:
* Remove the "lwp *" argument that was added to vget(). Turns out
that nothing actually used it!
* Remove the "lwp *" arguments that were added to VFS_ROOT(), VFS_VGET(),
and VFS_FHTOVP(); all they did was pass it to vget() (which, as noted
above, didn't use it).
* Remove all of the "lwp *" arguments to internal functions that were added
just to appease the above.
 1.88.2.2  03-Aug-2004  skrll Sync with HEAD
 1.88.2.1  02-Jul-2003  darrenr Apply the aborted ktrace-lwp changes to a specific branch. This is just for
others to review, I'm concerned that patch fuziness may have resulted in some
errant code being generated but I'll look at that later by comparing the diff
from the base to the branch with the file I attempt to apply to it. This will,
at the very least, put the changes in a better context for others to review
them and attempt to tinker with removing passing of 'struct lwp' through
the kernel.
 1.98.2.7  29-Nov-2005  tron Pull up following revision(s) (requested by christos in ticket #10155):
sys/miscfs/kernfs/kernfs_vnops.c: revision 1.114 via patch
Fix 64 bit truncation problem reported by http://www.securitylab.net
 1.98.2.6  01-Sep-2005  riz Pull up following revision(s) (requested by christos in ticket #5637):
sys/miscfs/kernfs/kernfs_vnops.c: revision 1.112
Also protect the ipsec ioctls from negative offsets to prevent panics
in m_copydata(). Pointed out by Karl Janmar. Move the negative offset
check from kernfs_xread() to kernfs_read().
 1.98.2.5  31-Aug-2005  tron Pull up following revision(s) (requested by christos in ticket #5633):
sys/miscfs/kernfs/kernfs_vnops.c: revision 1.111
Don't allow negative offsets when reading the message buffer, because it
can allow reading arbitrary kernel memory.
 1.98.2.4  24-May-2005  riz Pull up revision 1.108 (requested by chs in ticket #1540):
kernfs does not support mmap(), remove code that pretends that it does.
 1.98.2.3  15-May-2004  tron branches: 1.98.2.3.2;
Pull up revision 1.104 (requested by cl in ticket #326):
Workaround for gcc 2.95.3 failing to initialize structures
and/or unions inside structures using nested designators.
Should be reverted when gcc >=3.3.3 is ready for vax.
 1.98.2.2  15-May-2004  tron Pull up revision 1.102 (requested by cl in ticket #336):
Allow additional entries (files, subdirs) in kernfs. Also allow
defining additional kfstypes and provide hooks to run arbitrary code
for any vnodeop on the additional types.
 1.98.2.1  14-May-2004  jdc Pull up revision 1.100 and 1.101 (requested by cl in ticket #322).

Find the right entry when doing lookup on dotdot in kern/ipsec subdirs.
Also remove some duplicate code.

Make lookup and readdir return the same inode number. kernfs_readdir
now uses kernfs_allocvp to map from kernfs entry to inode number,
kernfs_allocvp is now the only place where entries are mapped to inode
numbers. Also make KERNFS_FILENO not return random results for entries
not in kern_targets.
 1.98.2.3.2.4  29-Nov-2005  tron Pull up following revision(s) (requested by christos in ticket #10155):
sys/miscfs/kernfs/kernfs_vnops.c: revision 1.114 via patch
Fix 64 bit truncation problem reported by http://www.securitylab.net
 1.98.2.3.2.3  01-Sep-2005  riz branches: 1.98.2.3.2.3.2;
Pull up following revision(s) (requested by christos in ticket #5637):
sys/miscfs/kernfs/kernfs_vnops.c: revision 1.112
Also protect the ipsec ioctls from negative offsets to prevent panics
in m_copydata(). Pointed out by Karl Janmar. Move the negative offset
check from kernfs_xread() to kernfs_read().
 1.98.2.3.2.2  31-Aug-2005  tron Pull up following revision(s) (requested by christos in ticket #5633):
sys/miscfs/kernfs/kernfs_vnops.c: revision 1.111
Don't allow negative offsets when reading the message buffer, because it
can allow reading arbitrary kernel memory.
 1.98.2.3.2.1  24-May-2005  riz Pull up revision 1.108 (requested by chs in ticket #1540):
kernfs does not support mmap(), remove code that pretends that it does.
 1.98.2.3.2.3.2.1  29-Nov-2005  tron Pull up following revision(s) (requested by christos in ticket #10155):
sys/miscfs/kernfs/kernfs_vnops.c: revision 1.114 via patch
Fix 64 bit truncation problem reported by http://www.securitylab.net
 1.106.6.1  19-Mar-2005  yamt sync with head. xen and whitespace. xen part is not finished.
 1.106.4.1  29-Apr-2005  kent sync with -current
 1.107.2.4  24-Nov-2005  tron Pull up following revision(s) (requested by christos in ticket #992):
sys/miscfs/kernfs/kernfs_vnops.c: revision 1.114 via patch
Fix 64 bit truncation problem reported by http://www.securitylab.net
 1.107.2.3  01-Sep-2005  tron Pull up following revision(s) (requested by christos in ticket #728):
sys/miscfs/kernfs/kernfs_vnops.c: revision 1.112
Also protect the ipsec ioctls from negative offsets to prevent panics
in m_copydata(). Pointed out by Karl Janmar. Move the negative offset
check from kernfs_xread() to kernfs_read().
 1.107.2.2  31-Aug-2005  tron Pull up following revision(s) (requested by christos in ticket #727):
sys/miscfs/kernfs/kernfs_vnops.c: revision 1.111
Don't allow negative offsets when reading the message buffer, because it
can allow reading arbitrary kernel memory.
 1.107.2.1  28-May-2005  tron Pull up revision 1.108 (requested by chs in ticket #329):
kernfs does not support mmap(), remove code that pretends that it does.
 1.109.2.4  21-Jan-2008  yamt sync with head
 1.109.2.3  07-Dec-2007  yamt sync with head
 1.109.2.2  30-Dec-2006  yamt sync with head.
 1.109.2.1  21-Jun-2006  yamt sync with head.
 1.112.2.1  20-Oct-2005  yamt adapt kernfs.
 1.113.2.1  29-Nov-2005  yamt sync with head.
 1.116.6.3  01-Jun-2006  kardel Sync with head.
 1.116.6.2  22-Apr-2006  simonb Sync with head.
 1.116.6.1  04-Feb-2006  simonb Adapt for timecounters: mostly use get*time() and use "time_second"
instead of "time.tv_sec".
 1.116.4.1  09-Sep-2006  rpaulo sync with head
 1.116.2.1  05-Feb-2006  yamt adapt kernfs.
 1.117.4.2  19-Apr-2006  elad sync with head.
 1.117.4.1  08-Mar-2006  elad Adapt to kernel authorization KPI.
 1.117.2.4  26-Jun-2006  yamt sync with head.
 1.117.2.3  24-May-2006  yamt sync with head.
 1.117.2.2  11-Apr-2006  yamt sync with head
 1.117.2.1  01-Apr-2006  yamt sync with head.
 1.118.2.1  24-May-2006  tron Merge 2006-05-24 NetBSD-current into the "peter-altq" branch.
 1.120.2.1  19-Jun-2006  chap Sync with head.
 1.121.2.1  13-Jul-2006  gdamore Merge from HEAD.
 1.125.6.2  10-Dec-2006  yamt sync with head.
 1.125.6.1  22-Oct-2006  yamt sync with head
 1.125.4.2  12-Jan-2007  ad Sync with head.
 1.125.4.1  18-Nov-2006  ad Sync with head.
 1.128.2.1  17-Feb-2007  tron Apply patch (requested by chs in ticket #422):
- Fix various deadlock problems with nullfs and unionfs.
- Speed up path lookups by upto 25%.
 1.132.26.2  18-Feb-2008  mjf Sync with HEAD.
 1.132.26.1  08-Dec-2007  mjf Sync with HEAD.
 1.132.20.1  09-Jan-2008  matt sync with HEAD
 1.132.18.1  27-Nov-2007  joerg Sync with HEAD. amd64 Xen support needs testing.
 1.132.6.1  16-Sep-2007  ad Checkpoint work in progress on the vnode lifecycle and reference counting
stuff. This makes it work properly without kernel_lock and fixes a few
quite old bugs. See vfs_subr.c 1.283.2.17 for details.
 1.133.6.1  02-Jan-2008  bouyer Sync with HEAD
 1.133.2.1  04-Dec-2007  ad Pull the vmlocking changes into a new branch.
 1.134.20.2  28-Apr-2009  skrll Sync with HEAD.
 1.134.20.1  19-Jan-2009  skrll Sync with HEAD.
 1.134.12.4  11-Aug-2010  yamt sync with head.
 1.134.12.3  11-Mar-2010  yamt sync with head
 1.134.12.2  18-Jul-2009  yamt sync with head.
 1.134.12.1  04-May-2009  yamt sync with head.
 1.134.8.1  29-Mar-2008  christos Welcome to the time_t=long long dev_t=uint64_t branch.
 1.134.6.1  17-Jan-2009  mjf Sync with HEAD.
 1.135.2.2  23-Jul-2009  jym Sync with HEAD.
 1.135.2.1  13-May-2009  jym Sync with HEAD.

Commit is split, to avoid a "too many arguments" protocol error.
 1.140.4.3  05-Mar-2011  rmind sync with head
 1.140.4.2  03-Jul-2010  rmind sync with head
 1.140.4.1  30-May-2010  rmind sync with head
 1.140.2.2  17-Aug-2010  uebayasi Sync with HEAD.
 1.140.2.1  30-Apr-2010  uebayasi Sync with HEAD.
 1.143.12.2  05-Apr-2012  mrg sync to latest -current.
 1.143.12.1  18-Feb-2012  mrg merge to -current.
 1.143.8.2  22-May-2014  yamt sync with head.

for a reference, the tree before this commit was tagged
as yamt-pagecache-tag8.

this commit was splitted into small chunks to avoid
a limitation of cvs. ("Protocol error: too many arguments")
 1.143.8.1  17-Apr-2012  yamt sync with head
 1.144.2.2  03-Sep-2016  bouyer Revert ticket 1367, it causes a kernel panic in test lib/libc/gen/t_getcwd
as seen in e.g.
http://www-soc.lip6.fr/~bouyer/NetBSD-tests/xen/netbsd-6/i386/201608291710Z_anita.txt

lib/libc/gen/t_getcwd (206/500): 2 test cases
getcwd_err: [0.006614s] Passed.
getcwd_fts: uvm_fault(0xc0e221b0, 0, 1) -> 0xe
fatal page fault in supervisor mode
trap type 6 code 0 eip c023ba9f cs 9 eflags 10246 cr2 1c ilevel 0
panic: trap
cpu1: Begin traceback...
panic(c04616d0,cdcfb938,cdcfb938,c023ba9f,9,10246,1c,0,1c,0) at netbsd:panic+0x18
trap() at netbsd:trap+0xb51
--- trap (number 6) ---
kernfs_readdir(cdcfbc0c,1,c11ce0b4,c0439f60,c11ce0b4,cdcfbc58,c0cc0cc0,cdcfbc7c,0,0) at netbsd:kernfs_readdir+0x98f
VOP_READDIR(c11ce0b4,cdcfbc58,c0cc0cc0,cdcfbc7c,0,0,c19287e0,1,cdcfbc58,cdcfbc74) at netbsd:VOP_READDIR+0x68
vn_readdir(c14c3000,bb512000,0,1000,cdcfbcbc,c19287e0,0,0,c14c3000,0) at netbsd:vn_readdir+0xbd
sys___getdents30(c19287e0,cdcfbd00,cdcfbd28,186,bb516000,0,cdcfbd00,c1199bf4,2,bb7a4fe7) at netbsd:sys___getdents30+0x8c
syscall(cdcfbd48,bb6b00b3,ab,bf7f001f,bb6b001f,0,bb5010d0,bf7fe764,bb7c4be0,0) at netbsd:syscall+0xaa
cpu1: End traceback...
 1.144.2.1  27-Aug-2016  bouyer Pull up following revision(s) (requested by is in ticket #1367):
sys/miscfs/kernfs/kernfs_vnops.c: revision 1.151
>From Ilya Zykov: Unbreak kernfs which was broken by this commit

|Make the spec_node table implementation private to spec_vnops.c.
|To retrieve a spec_node, two new lookup functions (by device or by mount)
|are implemented. Both return a referenced vnode, for an opened block device
|the opened vnode is returned so further diagnostic checks "vp == ... sd_bdevvp"
|will not fire. Otherwise any vnode matching the criteria gets returned.
|No objections on tech-kern.

The effect was that ls /kernfs appeared empty in most cases.
 1.146.2.3  03-Dec-2017  jdolecek update from HEAD
 1.146.2.2  20-Aug-2014  tls Rebase to HEAD as of a few days ago.
 1.146.2.1  23-Jun-2013  tls resync from head
 1.147.6.1  18-May-2014  rmind sync with head
 1.150.2.1  10-Aug-2014  tls Rebase.
 1.154.10.1  29-Aug-2019  martin Pull up following revision(s) (requested by hannken in ticket #1703):

sys/miscfs/kernfs/kernfs_vnops.c: revision 1.161
sys/miscfs/procfs/procfs_vnops.c: revision 1.207

Add missing operation VOP_GETPAGES() returning EFAULT.

Without this operation posix_fadvise(..., POSIX_FADV_WILLNEED)
would leave the v_interlock held.

Observed by maxv@
 1.154.6.1  29-Aug-2019  martin Pull up following revision(s) (requested by hannken in ticket #1703):

sys/miscfs/kernfs/kernfs_vnops.c: revision 1.161
sys/miscfs/procfs/procfs_vnops.c: revision 1.207

Add missing operation VOP_GETPAGES() returning EFAULT.

Without this operation posix_fadvise(..., POSIX_FADV_WILLNEED)
would leave the v_interlock held.

Observed by maxv@
 1.154.4.3  28-Aug-2017  skrll Sync with HEAD
 1.154.4.2  05-Oct-2016  skrll Sync with HEAD
 1.154.4.1  06-Jun-2015  skrll Sync with HEAD
 1.154.2.1  29-Aug-2019  martin Pull up following revision(s) (requested by hannken in ticket #1703):

sys/miscfs/kernfs/kernfs_vnops.c: revision 1.161
sys/miscfs/procfs/procfs_vnops.c: revision 1.207

Add missing operation VOP_GETPAGES() returning EFAULT.

Without this operation posix_fadvise(..., POSIX_FADV_WILLNEED)
would leave the v_interlock held.

Observed by maxv@
 1.155.2.1  26-Apr-2017  pgoyette Sync with HEAD
 1.156.2.1  21-Apr-2017  bouyer Sync with HEAD
 1.158.8.2  06-Sep-2018  pgoyette Sync with HEAD

Resolve a couple of conflicts (result of the uimin/uimax changes)
 1.158.8.1  07-Apr-2018  pgoyette Sync with HEAD. 77 conflicts resolved - all of them $NetBSD$
 1.158.2.1  29-Aug-2019  martin Pull up following revision(s) (requested by hannken in ticket #1346):

sys/miscfs/kernfs/kernfs_vnops.c: revision 1.161
sys/miscfs/procfs/procfs_vnops.c: revision 1.207

Add missing operation VOP_GETPAGES() returning EFAULT.

Without this operation posix_fadvise(..., POSIX_FADV_WILLNEED)
would leave the v_interlock held.

Observed by maxv@
 1.159.2.2  13-Apr-2020  martin Mostly merge changes from HEAD upto 20200411
 1.159.2.1  10-Jun-2019  christos Sync with HEAD
 1.160.4.3  06-Jul-2021  martin Pull up following revision(s) (requested by dholland in ticket #1318):

sys/miscfs/kernfs/kernfs_vnops.c: revision 1.169
sys/miscfs/kernfs/kernfs_vnops.c: revision 1.170

Add missing VOP_KQFILTER to kernfs.

Not sure if lack of it can be used for local DoS or not, but best to
fix.

-

Fix perms on /kern/{r,}rootdev.
 1.160.4.2  12-Feb-2020  martin Pull up following revision(s) (requested by riastradh in ticket #702):

sys/miscfs/kernfs/kernfs_vfsops.c: revision 1.98
sys/miscfs/kernfs/kernfs_vnops.c: revision 1.163
sys/miscfs/kernfs/kernfs.h: revision 1.43

Use specfs vnops for specnodes in kernfs.

While here, don't filter out rootdev and rrootdev merely because
they're not cached.

Fixes the elusive /kern/rootdev and /kern/rrootdev nodes, which only
appeared sometimes when they felt like it, and fixes operations on
/kern/rootdev and /kern/rrootdev always returning EOPNOTSUPP.

We didn't seem to have a single PR for these issues but the following
PRs are all relevant:

PR bin/13564
PR kern/38265
PR kern/38778
PR kern/45974

XXX pullup-9, pullup-8, pullup-7, pullup-6, pullup-5, pullup-4, pullup-3, p=
ullup-2, pullup-1.4T...
 1.160.4.1  01-Sep-2019  martin Pull up following revision(s) (requested by hannken in ticket #132):
sys/miscfs/kernfs/kernfs_vnops.c: revision 1.161
sys/miscfs/procfs/procfs_vnops.c: revision 1.207
Add missing operation VOP_GETPAGES() returning EFAULT.
Without this operation posix_fadvise(..., POSIX_FADV_WILLNEED)
would leave the v_interlock held.
Observed by maxv@
 1.162.2.1  29-Feb-2020  ad Sync with head.
 1.166.6.1  01-Aug-2021  thorpej Sync with HEAD.

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