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* devfs: add integrity asserts for cdevp_listJason A. Harmening2023-09-281-1/+11
| | | | | | | | | | | | | | | It's possible for misuse of cdev KPIs or for bugs in devfs itself to result in e.g. a cdev object's container being freed while still on the global list used to populate each devfs mount; see PR 273418 for a recent example. Since a node may be marked inactive well before it is reaped from the list, add a new flag solely to track list membership, and employ it in some basic list integrity assertions to catch bad actors. Discussed with: kib, mjg (cherry picked from commit 67864268da53b792836f13be10299de8cd62997e)
* sys: Remove $FreeBSD$: two-line .h patternWarner Losh2023-08-231-2/+0
| | | | | | | Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/ Similar commit in current: (cherry picked from commit 95ee2897e98f)
* spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSDWarner Losh2023-07-251-1/+1
| | | | | | | | | | | The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch up to that fact and revert to their recommended match of BSD-2-Clause. Discussed with: pfg MFC After: 3 days Sponsored by: Netflix (cherry picked from commit 4d846d260e2b9a3d4d0a701462568268cbfe7a5b)
* devfs(4): defer freeing until we drop devmtx ("cdev")Edward Tomasz Napierala2020-12-291-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Before r332974 the old code would sometimes cause a rare lock order reversal against pagequeue, which looked roughly like this: witness_checkorder() __mtx_lock-flags() vm_page_alloc() uma_small_alloc() keg_alloc_slab() keg_fetch-slab() zone_fetch-slab() zone_import() zone_alloc_bucket() uma_zalloc_arg() bucket_alloc() uma_zfree_arg() free() devfs_metoo() devfs_populate_loop() devfs_populate() devfs_rioctl() VOP_IOCTL_APV() VOP_IOCTL() vn_ioctl() fo_ioctl() kern_ioctl() sys_ioctl() Since r332974 the original problem no longer exists, but it still makes sense to move things out of the - often congested - lock. Reviewed By: kib, markj Sponsored by: NetApp, Inc. Sponsored by: Klara, Inc. Differential Revision: https://reviews.freebsd.org/D27334
* fs: clean up empty lines in .c and .h filesMateusz Guzik2020-09-011-4/+0
| | | | Notes: svn path=/head/; revision=365070
* devfs: Abstract locking assertionsConrad Meyer2020-08-121-3/+3
| | | | | | | | | | | | | | | The conversion was largely mechanical: sed(1) with: -e 's|mtx_assert(&devmtx, MA_OWNED)|dev_lock_assert_locked()|g' -e 's|mtx_assert(&devmtx, MA_NOTOWNED)|dev_lock_assert_unlocked()|g' The definitions of these abstractions in fs/devfs/devfs_int.h are the only non-mechanical change. No functional change. Notes: svn path=/head/; revision=364135
* devfs: bool -> intMateusz Guzik2020-08-101-1/+1
| | | | | | | Fixes buildworld after r364069 Notes: svn path=/head/; revision=364076
* devfs: save on spurious relocking for devfs_populateMateusz Guzik2020-08-101-2/+9
| | | | | | | Tested by: pho Notes: svn path=/head/; revision=364069
* Mark more nodes as CTLFLAG_MPSAFE or CTLFLAG_NEEDGIANT (17 of many)Pawel Biernacki2020-02-261-1/+2
| | | | | | | | | | | | | | | | | | | r357614 added CTLFLAG_NEEDGIANT to make it easier to find nodes that are still not MPSAFE (or already are but aren’t properly marked). Use it in preparation for a general review of all nodes. This is non-functional change that adds annotations to SYSCTL_NODE and SYSCTL_PROC nodes using one of the soon-to-be-required flags. Mark all obvious cases as MPSAFE. All entries that haven't been marked as MPSAFE before are by default marked as NEEDGIANT Approved by: kib (mentor, blanket) Commented by: kib, gallatin, melifaro Differential Revision: https://reviews.freebsd.org/D23718 Notes: svn path=/head/; revision=358333
* vfs: drop the mostly unused flags argument from VOP_UNLOCKMateusz Guzik2020-01-031-1/+1
| | | | | | | | | | | Filesystems which want to use it in limited capacity can employ the VOP_UNLOCK_FLAGS macro. Reviewed by: kib (previous version) Differential Revision: https://reviews.freebsd.org/D21427 Notes: svn path=/head/; revision=356337
* devfs: introduce a per-dev lock to protect ->si_devswMateusz Guzik2019-11-301-0/+3
| | | | | | | | | | | | | | | | This allows bumping threadcount without taking the global devmtx lock. In particular this eliminates contention on said lock while using bhyve with multiple vms. Reviewed by: kib Tested by: markj MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D22548 Notes: svn path=/head/; revision=355228
* Ensure that directory entry padding bytes are zeroed.Mark Johnston2018-11-231-1/+1
| | | | | | | | | | | | | | | | | Directory entries must be padded to maintain alignment; in many filesystems the padding was not initialized, resulting in stack memory being copied out to userspace. With the ino64 work there are also some explicit pad fields in struct dirent. Add a subroutine to clear these bytes and use it in the in-tree filesystems. The NFS client is omitted for now as it was fixed separately in r340787. Reported by: Thomas Barabosch, Fraunhofer FKIE Reviewed by: kib MFC after: 3 days Sponsored by: The FreeBSD Foundation Notes: svn path=/head/; revision=340856
* Move most of the contents of opt_compat.h to opt_global.h.Brooks Davis2018-04-061-2/+0
| | | | | | | | | | | | | | | | | | | | | opt_compat.h is mentioned in nearly 180 files. In-progress network driver compabibility improvements may add over 100 more so this is closer to "just about everywhere" than "only some files" per the guidance in sys/conf/options. Keep COMPAT_LINUX32 in opt_compat.h as it is confined to a subset of sys/compat/linux/*.c. A fake _COMPAT_LINUX option ensure opt_compat.h is created on all architectures. Move COMPAT_LINUXKPI to opt_dontuse.h as it is only used to control the set of compiled files. Reviewed by: kib, cem, jhb, jtl Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D14941 Notes: svn path=/head/; revision=332122
* sys/fs: further adoption of SPDX licensing ID tags.Pedro F. Giffuni2017-11-271-0/+2
| | | | | | | | | | | | | | | Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Notes: svn path=/head/; revision=326268
* Commit the 64-bit inode project.Konstantin Belousov2017-05-231-1/+13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Extend the ino_t, dev_t, nlink_t types to 64-bit ints. Modify struct dirent layout to add d_off, increase the size of d_fileno to 64-bits, increase the size of d_namlen to 16-bits, and change the required alignment. Increase struct statfs f_mntfromname[] and f_mntonname[] array length MNAMELEN to 1024. ABI breakage is mitigated by providing compatibility using versioned symbols, ingenious use of the existing padding in structures, and by employing other tricks. Unfortunately, not everything can be fixed, especially outside the base system. For instance, third-party APIs which pass struct stat around are broken in backward and forward incompatible ways. Kinfo sysctl MIBs ABI is changed in backward-compatible way, but there is no general mechanism to handle other sysctl MIBS which return structures where the layout has changed. It was considered that the breakage is either in the management interfaces, where we usually allow ABI slip, or is not important. Struct xvnode changed layout, no compat shims are provided. For struct xtty, dev_t tty device member was reduced to uint32_t. It was decided that keeping ABI compat in this case is more useful than reporting 64-bit dev_t, for the sake of pstat. Update note: strictly follow the instructions in UPDATING. Build and install the new kernel with COMPAT_FREEBSD11 option enabled, then reboot, and only then install new world. Credits: The 64-bit inode project, also known as ino64, started life many years ago as a project by Gleb Kurtsou (gleb). Kirk McKusick (mckusick) then picked up and updated the patch, and acted as a flag-waver. Feedback, suggestions, and discussions were carried by Ed Maste (emaste), John Baldwin (jhb), Jilles Tjoelker (jilles), and Rick Macklem (rmacklem). Kris Moore (kris) performed an initial ports investigation followed by an exp-run by Antoine Brodin (antoine). Essential and all-embracing testing was done by Peter Holm (pho). The heavy lifting of coordinating all these efforts and bringing the project to completion were done by Konstantin Belousov (kib). Sponsored by: The FreeBSD Foundation (emaste, kib) Differential revision: https://reviews.freebsd.org/D10439 Notes: svn path=/head/; revision=318736
* Minor style fixes.Konstantin Belousov2017-02-161-2/+3
| | | | | | | | Sponsored by: The FreeBSD Foundation MFC after: 3 days Notes: svn path=/head/; revision=313797
* Remove zero assignments in the cdev allocator. cdp memory isKonstantin Belousov2016-05-211-5/+0
| | | | | | | | | | requested with M_ZERO. Sponsored by: The FreeBSD Foundation MFC after: 2 weeks Notes: svn path=/head/; revision=300365
* When devfs dirent is freed, a vnode might still keep a pointer to it,Konstantin Belousov2016-01-221-0/+7
| | | | | | | | | | | apparently. Interlock and clear the pointer to avoid free memory dereference. Submitted by: bde (previous version) MFC after: 3 weeks Notes: svn path=/head/; revision=294595
* Disable timestamping on devfs read/write operations by default.Xin LI2015-03-211-1/+1
| | | | | | | | | | | | | | | | | | | | | Currently we update timestamps unconditionally when doing read or write operations. This may slow things down on hardware where reading timestamps is expensive (e.g. HPET, because of the default vfs.timestamp_precision setting is nanosecond now) with limited benefit. A new sysctl variable, vfs.devfs.dotimes is added, which can be set to non-zero value when the old behavior is desirable. Differential Revision: https://reviews.freebsd.org/D2104 Reported by: Mike Tancsa <mike sentex net> Reviewed by: kib Relnotes: yes Sponsored by: iXsystems, Inc. MFC after: 2 weeks Notes: svn path=/head/; revision=280308
* Stop enforcing additional reference on all cdevs, which was introducedKonstantin Belousov2015-01-191-6/+0
| | | | | | | | | | | | | | | in r277199. Acquire the neccessary reference in delist_dev_locked() and inform destroy_devl() about it using CDP_UNREF_DTR flag. Fix some style nits, add asserts. Discussed with: hselasky Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week Notes: svn path=/head/; revision=277391
* Ignore devfs directory entries for devices either being destroyed orKonstantin Belousov2015-01-191-0/+10
| | | | | | | | | | | delisted. The check is racy. Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week Notes: svn path=/head/; revision=277390
* Avoid race with "dev_rel()" when using the recently addedHans Petter Selasky2015-01-141-0/+6
| | | | | | | | | | | | "delist_dev()" function. Make sure the character device structure doesn't go away until the end of the "destroy_dev()" function due to concurrently running cleanup code inside "devfs_populate()". MFC after: 1 week Reported by: dchagin@ Notes: svn path=/head/; revision=277199
* Fix multiple incorrect SYSCTL arguments in the kernel:Hans Petter Selasky2014-10-211-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Wrong integer type was specified. - Wrong or missing "access" specifier. The "access" specifier sometimes included the SYSCTL type, which it should not, except for procedural SYSCTL nodes. - Logical OR where binary OR was expected. - Properly assert the "access" argument passed to all SYSCTL macros, using the CTASSERT macro. This applies to both static- and dynamically created SYSCTLs. - Properly assert the the data type for both static and dynamic SYSCTLs. In the case of static SYSCTLs we only assert that the data pointed to by the SYSCTL data pointer has the correct size, hence there is no easy way to assert types in the C language outside a C-function. - Rewrote some code which doesn't pass a constant "access" specifier when creating dynamic SYSCTL nodes, which is now a requirement. - Updated "EXAMPLES" section in SYSCTL manual page. MFC after: 3 days Sponsored by: Mellanox Technologies Notes: svn path=/head/; revision=273377
* Fix long known bug with handling device aliases residing not in devfs root.Alexander Motin2013-12-121-4/+12
| | | | | | | | | | | | Historically creation of device aliases created symbolic links using only name of target device as a link target, not considering current directory. Fix that by adding number of "../" chunks to the terget device name, required to get out of the current directory to devfs root first. MFC after: 1 month Notes: svn path=/head/; revision=259254
* - Correct mispellings of the word necessaryGabor Kovesdan2013-04-171-1/+1
| | | | | | | Submitted by: Christoph Mallon <christoph.mallon@gmx.de> (via private mail) Notes: svn path=/head/; revision=249583
* Remove M_USE_RESERVE from the devfs cdp allocator, which is one of twoKonstantin Belousov2012-11-141-1/+1
| | | | | | | | | | | uses of M_USE_RESERVE in the kernel. This allocation is not special. Reviewed by: alc Tested by: pho MFC after: 2 weeks Notes: svn path=/head/; revision=243039
* Merge si_name and __si_namebuf.Ed Schouten2012-02-101-1/+0
| | | | | | | | The si_name pointer always points to the __si_namebuf member inside the same object. Remove it and rename __si_namebuf to si_name. Notes: svn path=/head/; revision=231379
* Export devfs inode number allocator for the kernel consumers.Konstantin Belousov2011-10-051-3/+17
| | | | | | | | Reviewed by: jhb MFC after: 2 weeks Notes: svn path=/head/; revision=226041
* Do not update mountpoint generation counter to the value which was notKonstantin Belousov2011-08-091-2/+4
| | | | | | | | | | | yet acted upon by devfs_populate(). Submitted by: Kohji Okuno <okuno.kohji jp panasonic com> Approved by: re (bz) MFC after: 1 week Notes: svn path=/head/; revision=224743
* - Assert that dm_lock is exclusively held in devfs_rules_apply() andJaakko Heinonen2010-12-151-0/+2
| | | | | | | | | | | in devfs_vmkdir() while adding the entry to de_list of the parent. - Apply devfs rules to newly created directories and symbolic links. PR: kern/125034 Submitted by: Mateusz Guzik (original version) Notes: svn path=/head/; revision=216461
* Add a new function devfs_dev_exists() to be able to find out if aJaakko Heinonen2010-09-271-0/+21
| | | | | | | | | | | | specific devfs path already exists. The function will be used from kern_conf.c to detect duplicate device registrations. Callers must hold the devmtx mutex. Reviewed by: kib Notes: svn path=/head/; revision=213221
* Add reference counting for devfs paths containing user created symbolicJaakko Heinonen2010-09-271-1/+12
| | | | | | | | | | | | | | | | | | | links. The reference counting is needed to be able to determine if a specific devfs path exists. For true device file paths we can traverse the cdevp_list but a separate directory list is needed for user created symbolic links. Add a new directory entry flag DE_USER to mark entries which should unreference their parent directory on deletion. A new function to traverse cdevp_list and the directory list will be introduced in a separate commit. Idea from: kib Reviewed by: kib Notes: svn path=/head/; revision=213215
* - For consistency, remove "." and ".." entries from de_dlist beforeJaakko Heinonen2010-09-181-0/+4
| | | | | | | | | | | | calling devfs_delete() (and thus possibly dropping dm_lock) in devfs_rmdir_empty(). - Assert that we don't return doomed entries from devfs_find(). [1] Suggested by: kib [1] Reviewed by: kib Notes: svn path=/head/; revision=212826
* Remove empty devfs directories automatically.Jaakko Heinonen2010-09-151-8/+71
| | | | | | | | | | | | | | | | | | | | | | | devfs_delete() now recursively removes empty parent directories unless the DEVFS_DEL_NORECURSE flag is specified. devfs_delete() can't be called anymore with a parent directory vnode lock held because the possible parent directory deletion needs to lock the vnode. Thus we unlock the parent directory vnode in devfs_remove() before calling devfs_delete(). Call devfs_populate_vp() from devfs_symlink() and devfs_vptocnp() as now directories can get removed. Add a check for DE_DOOMED flag to devfs_populate_vp() because devfs_delete() drops dm_lock before the VI_DOOMED vnode flag gets set. This ensures that devfs_populate_vp() returns an error for directories which are in progress of deletion. Reviewed by: kib Discussed on: freebsd-current (mostly silence) Notes: svn path=/head/; revision=212660
* Allow user created symbolic links to cover device files and directoriesJaakko Heinonen2010-08-121-5/+28
| | | | | | | | | | | | | | | | | if the device file appears during or after the link creation. User created symbolic links are now inserted at the head of the directory entry list after the "." and ".." entries. A new directory entry flag DE_COVERED indicates that an entry is covered by a symbolic link. PR: kern/114057 Reviewed by: kib Idea from: kib Discussed on: freebsd-current (mostly silence) Notes: svn path=/head/; revision=211226
* Add a new function devfs_parent_dirent() for resolving devfs parentJaakko Heinonen2010-06-091-0/+20
| | | | | | | | | | directory entry. Use the new function in devfs_fqpn(), devfs_lookupx() and devfs_vptocnp() instead of manually resolving the parent entry. Reviewed by: kib Notes: svn path=/head/; revision=208951
* Add MAKEDEV_NOWAIT flag to make_dev_credf(9), to create a device nodeKonstantin Belousov2010-05-061-2/+7
| | | | | | | | | | | in a no-sleep context. If resource allocation cannot be done without sleep, make_dev_credf() fails and returns NULL. Reviewed by: jh MFC after: 2 weeks Notes: svn path=/head/; revision=207729
* Revert r206560. The change doesn't work correctly in all cases withJaakko Heinonen2010-04-161-23/+0
| | | | | | | multiple devfs mounts. Notes: svn path=/head/; revision=206698
* - Ignore and report duplicate and empty device names in devfs_populate_loop()Jaakko Heinonen2010-04-131-0/+23
| | | | | | | | | | | | | instead of causing erratic behavior. Currently make_dev(9) can't fail, so there is no way to report an error to make_dev(9) callers. - Disallow using "." and ".." in device path names. It didn't work previously but now it is reported rather than panicing. - Treat multiple sequential slashes as single in device path names. Discussed with: pjd Notes: svn path=/head/; revision=206560
* Properly use dev_refl()/dev_rel() in kern.devname.Ed Schouten2010-01-311-10/+13
| | | | | | | | | | | While there, perform some clean-up fixes. Update some stale comments on struct cdev * instead of dev_t and devfs_random(). Also add some missing whitespace. MFC after: 1 week Notes: svn path=/head/; revision=203292
* Move "options MAC" from opt_mac.h to opt_global.h, as it's now in GENERICRobert Watson2009-06-051-2/+0
| | | | | | | | | | | and used in a large number of files, but also because an increasing number of incorrect uses of MAC calls were sneaking in due to copy-and-paste of MAC-aware code without the associated opt_mac.h include. Discussed with: pjd Notes: svn path=/head/; revision=193511
* Mark most often used sysctl's as MPSAFE.Ed Schouten2009-01-281-2/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | After running a `make buildkernel', I noticed most of the Giant locks in sysctl are only caused by a very small amount of sysctl's: - sysctl.name2oid. This one is locked by SYSCTL_LOCK, just like sysctl.oidfmt. - kern.ident, kern.osrelease, kern.version, etc. These are just constant strings. - kern.arandom, used by the stack protector. It is already protected by arc4_mtx. I also saw the following sysctl's show up. Not as often as the ones above, but still quite often: - security.jail.jailed. Also mark security.jail.list as MPSAFE. They don't need locking or already use allprison_lock. - kern.devname, used by devname(3), ttyname(3), etc. This seems to reduce Giant locking inside sysctl by ~75% in my primitive test setup. Notes: svn path=/head/; revision=187864
* Already initialize the vfs timestamps inside the cdev upon allocation.Ed Schouten2008-09-211-0/+4
| | | | | | | | | | | | | | | | In the MPSAFE TTY branch I noticed the vfs timestamps inside devfs were allocated with 0, where the getattr() routine bumps the timestamps to boottime if the value is below 3600. The reason why it has been designed like this, is because timestamps during boot are likely to be invalid. This means that device nodes that are created on demand (posix_openpt()) have timestamps with a value of boottime, which is not what we want. Solve this by calling vfs_timestamp() inside devfs_alloc(). Discussed with: kib Notes: svn path=/head/; revision=183230
* Struct cdev is always the member of the struct cdev_priv. When devfsKonstantin Belousov2008-06-161-4/+3
| | | | | | | | | | | | | | needed to promote cdev to cdev_priv, the si_priv pointer was followed. Use member2struct() to calculate address of the wrapping cdev_priv. Rename si_priv to __si_reserved. Tested by: pho Reviewed by: ed MFC after: 2 weeks Notes: svn path=/head/; revision=179828
* VOP_LOCK1() (and so VOP_LOCK()) and VOP_UNLOCK() are only used inAttilio Rao2008-01-131-3/+1
| | | | | | | | | | | | | | conjuction with 'thread' argument passing which is always curthread. Remove the unuseful extra-argument and pass explicitly curthread to lower layer functions, when necessary. KPI results broken by this change, which should affect several ports, so version bumping and manpage update will be further committed. Tested by: kris, pho, Diego Sardina <siarodx at gmail dot com> Notes: svn path=/head/; revision=175294
* vn_lock() is currently only used with the 'curthread' passed as argument.Attilio Rao2008-01-101-1/+1
| | | | | | | | | | | | | | | | | | | Remove this argument and pass curthread directly to underlying VOP_LOCK1() VFS method. This modify makes the code cleaner and in particular remove an annoying dependence helping next lockmgr() cleanup. KPI results, obviously, changed. Manpage and FreeBSD_version will be updated through further commits. As a side note, would be valuable to say that next commits will address a similar cleanup about VFS methods, in particular vop_lock1 and vop_unlock. Tested by: Diego Sardina <siarodx at gmail dot com>, Andrea Di Pasquale <whyx dot it at gmail dot com> Notes: svn path=/head/; revision=175202
* Merge first in a series of TrustedBSD MAC Framework KPI changesRobert Watson2007-10-241-4/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | from Mac OS X Leopard--rationalize naming for entry points to the following general forms: mac_<object>_<method/action> mac_<object>_check_<method/action> The previous naming scheme was inconsistent and mostly reversed from the new scheme. Also, make object types more consistent and remove spaces from object types that contain multiple parts ("posix_sem" -> "posixsem") to make mechanical parsing easier. Introduce a new "netinet" object type for certain IPv4/IPv6-related methods. Also simplify, slightly, some entry point names. All MAC policy modules will need to be recompiled, and modules not updates as part of this commit will need to be modified to conform to the new KPI. Sponsored by: SPARTA (original patches against Mac OS X) Obtained from: TrustedBSD Project, Apple Computer Notes: svn path=/head/; revision=172930
* Rename mac*devfsdirent*() to mac*devfs*() to synchronize with SEDarwin,Robert Watson2007-04-231-2/+2
| | | | | | | | | | | where similar data structures exist to support devfs and the MAC Framework, but are named differently. Obtained from: TrustedBSD Project Sponsored by: SPARTA, Inc. Notes: svn path=/head/; revision=168977
* Complete break-out of sys/sys/mac.h into sys/security/mac/mac_framework.hRobert Watson2006-10-221-1/+2
| | | | | | | | | | | | | | | | begun with a repo-copy of mac.h to mac_framework.h. sys/mac.h now contains the userspace and user<->kernel API and definitions, with all in-kernel interfaces moved to mac_framework.h, which is now included across most of the kernel instead. This change is the first step in a larger cleanup and sweep of MAC Framework interfaces in the kernel, and will not be MFC'd. Obtained from: TrustedBSD Project Sponsored by: SPARTA Notes: svn path=/head/; revision=163606
* Properly lock the vnode around vgone() calls.Konstantin Belousov2006-10-181-15/+45
| | | | | | | | | | | | | | Unlock the vnode in devfs_close() while calling into the driver d_close() routine. devfs_revoke() changes by: ups Reviewed and bugfixes by: tegge Tested by: mbr, Peter Holm Approved by: pjd (mentor) MFC after: 1 week Notes: svn path=/head/; revision=163481
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