is now synchronized by a mutex, whereas access to user maps is still
synchronized by a lockmgr()-based lock. Why? No single type of lock,
including sx locks, meets the requirements of both types of vm map.
Sometimes we sleep while holding the lock on a user map. Thus, a
a mutex isn't appropriate. On the other hand, both lockmgr()-based
and sx locks release Giant when a thread/process blocks during
contention for a lock. This could lead to a race condition in a legacy
driver (that relies on Giant for synchronization) if it attempts to
kmem_malloc() and fails to immediately obtain the lock. Fortunately,
we never sleep while holding a system map lock.
calling getmicrouptime (but maintain the struct timeval-based calling
convention for compatibility)
o eliminate the use of timersub in ratecheck
Note that flood ping tests indicate ppsratecheck is inaccurate (but on the
conservative side) with this revised implementation. If more accuracy is
needed we'll have to introduce an alternate interface or increase the
overhead.
Reviewed by: silby, dillon, bde
implement ALT_BREAK_TO_DEBUGGER. The caller provides a pointer to a state
variable to allow different state to be maintained for separate instances of
a device.
- Use struct vm_map * instead of vm_map_t in db_break.h to avoid its users
needing to include vm headers.
Requested by: njl
for the raidctl device.
Select a more conservative default for the permissions for /dev/raidctl
since the operations are performed using ioctl() not read() and write().
Submitted by: kris
Reviewed by: scottl
Use BUS_SPACE_MAXSIZE_32BIT for the parent dma tags, and
(NSEGS - 1) * PAGE_SIZE for the data buffer tags. FreeBSD/sparc64 is
more strict about checking these values that other arches.
It is not complete (the LILO root= specification isn't passed to our
loader for instance), it has not been touched in over 2 years. Linux has
moved on to GRUB, so this is OBE now. If someone creeps up to work on it,
it could become a port.
were sometimes propagated using M_COPY_PKTHDR which actually did
something between a "move" and a "copy" operation. This is replaced
by M_MOVE_PKTHDR (which copies the pkthdr contents and "removes" it
from the source mbuf) and m_dup_pkthdr which copies the packet
header contents including any m_tag chain. This corrects numerous
problems whereby mbuf tags could be lost during packet manipulations.
These changes also introduce arguments to m_tag_copy and m_tag_copy_chain
to specify if the tag copy work should potentially block. This
introduces an incompatibility with openbsd which we may want to revisit.
Note that move/dup of packet headers does not handle target mbufs
that have a cluster bound to them. We may want to support this;
for now we watch for it with an assert.
Finally, M_COPYFLAGS was updated to include M_FIRSTFRAG|M_LASTFRAG.
Supported by: Vernier Networks
Reviewed by: Robert Watson <rwatson@FreeBSD.org>
Note that the original RFC 1323 (PAWS) says in 4.2.1 that the out of
order / reverse-time-indexed packet should be acknowledged as specified
in RFC-793 page 69 then dropped. The original PAWS code in FreeBSD (1994)
simply acknowledged the segment unconditionally, which is incorrect, and
was fixed in 1.183 (2002). At the moment we do not do checks for SYN or FIN
in addition to (tlen != 0), which may or may not be correct, but the
worst that ought to happen should be a retry by the sender.
do this avoid m_getcl so we can copy the packet header to a clean mbuf
before adding the cluster
o move an assert to the right place
Supported by: Vernier Networks
- Add a mtx_destroy() to vm_object_collapse(). (This allows a bzero()
to migrate from _vm_object_allocate() to vm_object_zinit(), where it
will be performed less often.)
__acl_get_link(), __acl_set_link(), acl_delete_link(), and
__acl_aclcheck_link(), with almost identical implementations to
the existing __acl_*_file() variants on these calls. Update
copyright.
Obtained from: TrustedBSD Project
__acl_get_link() Retrieve an ACL by name without following
symbolic links.
__acl_set_link() Set an ACL by name without following
symbolic links.
__acl_delete_link() Delete an ACL by name without following
symbolic links.
__acl_aclcheck_link() Check an ACL against a file by name without
following symbolic links.
These calls are similar in spirit to lstat(), lchown(), lchmod(), etc,
and will be used under similar circumstances.
Obtained from: TrustedBSD Project
work. The interface was gleaned from the Linux driver. Currently only
one RX & one TX buffer are used. Firmware support is not tested so for the
MPI-350 so it is disabled. Signal cache and monitor mode are not supported
yet. Signal cache is not supported since in encapsulation mode ethernet
frames are returned by the chip. LAN monitor mode support will be added
shortly. Thanks to Warner for the MPI-350 card he sent me.
Add support for RSSI map from PR kern/32880 which was incomplete. Enhanced
with the ability to select the cache mode of raw, dbm or per-cent.
Clean up Signal/Noise/Quality structures and units with help from
Marco Molteni.
Change flash to use a malloc'ed buffer when needed.
PR: kern/32880
Submitted by: Douglas S. J. De Couto decouto@pdos.lcs.mit.edu,
Marco Molteni
MFC: 3 weeks
call is in progress on the vnode. When vput() or vrele() sees a
1->0 reference count transition, it now return without any further
action if this flag is set. This flag is necessary to avoid recursion
into VOP_INACTIVE if the filesystem inactive routine causes the
reference count to increase and then drop back to zero. It is also
used to guarantee that an unlocked vnode will not be recycled while
blocked in VOP_INACTIVE().
There are at least two cases where the recursion can occur: one is
that the softupdates code called by ufs_inactive() via ffs_truncate()
can call vput() on the vnode. This has been reported by many people
as "lockmgr: draining against myself" panics. The other case is
that nfs_inactive() can call vget() and then vrele() on the vnode
to clean up a sillyrename file.
Reviewed by: mckusick (an older version of the patch)
MUTEX_PROFILING is in opt_global.h, so this does not introduce a risk of
variant structure sizes unless foreign kernel modules are used.
This saved 16 bytes per vnode and 16 bytes per vm object for a total of
4MB on a 2GB machine.
Idea from: alc
to treat desiredvnodes much more like a limit than as a vague concept.
On a 2GB RAM machine where desired vnodes is 130k, we run out of
kmem_map space when we hit about 190k vnodes.
If we wake up the vnode washer in getnewvnode(), sleep until it is done,
so that it has a chance to offer us a washed vnode. If we don't sleep
here we'll just race ahead and allocate yet a vnode which will never
get freed.
In the vnodewasher, instead of doing 10 vnodes per mountpoint per
rotation, do 10% of the vnodes distributed evenly across the
mountpoints.
here. It manifests itself by sendmail hanging in "fifoow" during
boot on a diskless machine with sendmail disabled.
Giving the sleep a 1sec timout breaks the deadlock, but does not solve
the underlying problem.
XXX comment applied.
