instead of failing.
When looking for a region to allocate, we used to check to see if the
start address was < end. In the case where A..B is allocated already,
and one wants to allocate A..C (B < C), then this test would
improperly fail (which means we'd examine that region as a possible
one), and we'd return the region B+1..C+(B-A+1) rather than NULL.
Since C+(B-A+1) is necessarily larger than C (end argument), this is
incorrect behavior for rman_reserve_resource_bound().
The fix is to exclude those regions where r->r_start + count - 1 > end
rather than r->r_start > end. This bug has been in this code for a
very long time. I believe that all other tests against end are
correctly done.
This is why sio0 generated a message about interrupts not being
enabled properly for the device. When fdc had a bug that allocated
from 0x3f7 to 0x3fb, sio0 was then given 0x3fc-0x404 rather than the
0x3f8-0x3ff that it wanted. Now when fdc has the same bug, sio0 fails
to allocate its ports, which is the proper behavior. Since the probe
failed, we never saw the messed up resources reported.
I suspect that there are other places in the tree that have weird
looping or other odd work arounds to try to cope with the observed
weirdness this bug can introduce. These workarounds should be located
and eliminated.
Minor debug write fix to match the above test done as well.
'nice' by: mdodd
Sponsored by: timing solutions (http://www.timing.com/)
I think all we really need is -fno-sse2.
I really don't like cluttering up the compiler invocation,
but this bigger hammer will fix reported problems for now.
to mistakes from day 1, it has always had semantics inconsistent with
SVR4 and its successors. In particular, given argument M:
- On Solaris and FreeBSD/{alpha,sparc64}, it clobbers the old flags
and *sets* the new flag word to M. (NetBSD, too?)
- On FreeBSD/{amd64,i386}, it *clears* the flags that are specified in M
and leaves the remaining flags unchanged (modulo a small bug on amd64.)
- On FreeBSD/ia64, it is not implemented.
There is no way to fix fpsetsticky() to DTRT for both old FreeBSD apps
and apps ported from other operating systems, so the best approach
seems to be to kill the function and fix any apps that break. I
couldn't find any ports that use it, and any such ports would already
be broken on FreeBSD/ia64 and Linux anyway.
By the way, the routine has always been undocumented in FreeBSD,
except for an MLINK to a manpage that doesn't describe it. This
manpage has stated since 5.3-RELEASE that the functions it describes
are deprecated, so that must mean that functions that it is *supposed*
to describe but doesn't are even *more* deprecated. ;-)
Note that fpresetsticky() has been retained on FreeBSD/i386. As far
as I can tell, no other operating systems or ports of FreeBSD
implement it, so there's nothing for it to be inconsistent with.
PR: 75862
Suggested by: bde
- Move VSHOULDBUSY, VSHOULDFREE, and VTRYRECYCLE into vfs_subr.c so
no one else attempts to grow a dependency on them.
- Now that objects with pages hold the vnode we don't have to do unlocked
checks for the page count in the vm object in VSHOULDFREE. These three
macros could simply check for holdcnt state transitions to determine
whether the vnode is on the free list already, but the extra safety
the flag affords us is probably worth the minimal cost.
- The leafonly sysctl and code have been dead for several years now,
remove the sysctl and the code that employed it from vtryrecycle().
- vtryrecycle() also no longer has to check the object's page count as
the object holds the vnode until it reaches 0.
Sponsored by: Isilon Systems, Inc.
is inserted.
- In vm_page_remove() drop the backing vnode when the last page
is removed.
- Don't check the vnode to see if it must be reclaimed on every
call to vm_page_free_toq() as we only check it now when it is
actually required. This saves us two lock operations per call.
Sponsored by: Isilon Systems, Inc.
that they set v->v_vnlock. This is true for all filesystems in the
tree.
- Remove all uses of LK_THISLAYER. If the lower layer is locked, the
null layer is locked. We only use vget() to get a reference now.
null essentially does no locking. This fixes LOOKUP_SHARED with
nullfs.
- Remove the special LK_DRAIN considerations, I do not believe this is
needed now as LK_DRAIN doesn't destroy the lower vnode's lock, and
it's hardly used anymore.
- Add one well commented hack to prevent the lowervp from going away
while we're in it's VOP_LOCK routine. This can only happen if we're
forcibly unmounted while some callers are waiting in the lock. In
this case the lowervp could be recycled after we drop our last ref
in null_reclaim(). Prevent this with a vhold().
that we free that resource. All the other resources are freed in
their own routine, but since we haven't saved a pointer to this one,
it is leaked. This is the failure case that lead to the sio ports
that weren't working, I think.
sys/bus_dma.h instead of being copied in every single arch. This slightly
reorders a flag that was specific to AXP and thus changes the ABI there.
The interface still relies on bus_space definitions found in <machine/bus.h>
so it cannot be included on its own yet, but that will be fixed at a later
date. Add an MD <machine/bus_dma.h> for ever arch for consistency and to
allow for future MD augmentation of the API. sparc64 makes heavy use of
this right now due to its different bus_dma implemenation.
as suggested by Matt's comment. Also fix some style and paranoia issues.
The entire function could benefit from review by a VFS guru.
MFC after: 6 weeks
Since we used an sbuf of size resid to accumulate dirents, we would end
up returning one byte short when we had enough dirents to fill or exceed
the size of the sbuf (the last byte being lost to bogus NUL termination)
causing the next call to return EINVAL due to an unaligned offset. This
went undetected for a long time because I did most of my testing in
single-user mode, where there are rarely enough processes to fill the
4096-byte buffer ls(1) uses. The most common symptom of this bug is that
tab completion of /proc or /compat/linux/proc does not work properly when
many processes are running.
Also, a check near the top would return EINVAL if resid was smaller than
PFS_DELEN, even if it was 0, which is frequently the case and perfectly
allowable. Change the test so that it returns 0 if resid is 0.
MFC after: 2 weeks
to get from (mount + inode) to vnode. These tables are mostly
copy&pasted from UFS, sized based on desiredvnodes and therefore
quite large (128K-512K). Several filesystems are buggy enough that
they allocate the hash table even before they know if they will
ever be used or not.
Add "vfs_hash", a system wide hash table, which will replace all
the per-filesystem hash-tables.
The fields we add to struct vnode will more or less be saved in
the respective filesystems inodes.
Having one central implementation will save code and will allow us
to justify the complexity of code to dynamically (re)size the hash
at a later point.
to use only the holdcnt to determine whether a vnode may be recycled,
simplifying the V* macros as well as vtryrecycle(), etc.
Sponsored by: Isilon Systems, Inc.
vtryrecycle(). All obj refs also ref the vnode.
- Consistently use v_incr_usecount() to increment the usecount. This will
be more important later.
Sponsored by: Isilon Systems, Inc.
cleared if the host controller retries the transfer and is successful,
but we were interpreting these bits as indicating a fatal error.
Ignore these error bits, and instead use the HALTED bit to determine
if the transfer failed. Also update the USBD_STALLED detection to
ignore these bits.
Obtained from: OpenBSD
the filesystem. Check that rather than VI_XLOCK.
- VOP_INACTIVE should no longer drop the vnode lock.
- The vnode lock is required around calls to vrecycle() and vgone().
Sponsored by: Isilon Systems, Inc.
vnode lock. Remove the c_lock and use the vn lock in its place.
- Keep the coda lock functions so that the debugging information is
preserved, but call directly to the vop_std*lock routines for the real
functionality.
Sponsored by: Isilon Systems, Inc.
the filesystem. Check that rather than VI_XLOCK.
- Shorten ffs_reload by one step. The old check for an inactive vnode
was slightly racey, and the code which deals with still active vnodes
is not much more expensive.
Sponsored by: Isilon Systems, Inc.
required.
- In ufs_close(), don't do the EAGAIN vrele hack, the top layer now calls
vn_start_write before the lock is acquired as it should.
Sponsored by: Isilon Systems, Inc.
- Also in ufs_inactive, don't acquire the vnode interlock where it isn't
strictly needed. Also owning the vnode interlock while calling vprint()
will cause locking assertions to trip.
Sponsored by: Isilon Systems, Inc.
on an unlinked file. We can't know if this is the case until after we
have the lock.
- Lock the vnode in vn_close, many filesystems had code which was unsafe
without the lock held, and holding it greatly simplifies vgone().
- Adjust vn_lock() to check for the VI_DOOMED flag where appropriate.
Sponsored by: Isilon Systems, Inc.
- Add a vn_start_write/vn_finished_write around vlrureclaim so we don't do
writing ops without suspending. This could suspend the vlruproc which
should not be a problem under normal circumstances.
- Manually implement VMIGHTFREE in vlrureclaim as this was the only instance
where it was used.
- Acquire a lock before calling vgone() as it now requires it.
- Move the acquisition of the vnode interlock from vtryrecycle() to
getnewvnode() so that if it fails we don't drop and reacquire the
vnode_free_list_mtx.
- Check for a usecount or holdcount at the end of vtryrecycle() in case
someone grabbed a ref while we were recycling. Abort the recycle, and
on the final ref drop this vnode will be placed on the head of the free
list.
- Move the redundant VOP_INACTIVE protection code into the local
vinactive() routine to avoid code bloat.
- Keep the vnode lock held across calls to vgone() in several places.
- vgonel() no longer uses XLOCK, instead callers must hold an exclusive
vnode lock. The VI_DOOMED flag is set to allow other threads to detect
a vnode which is no longer valid. This flag is set until the last
reference is gone, and there are no chances for a new ref. vgonel()
holds this lock across the entire function, which greatly simplifies
logic.
_ Only vfree() in one place in vgone() not three.
- Adjust vget() to check the VI_DOOMED flag prior to waiting on the lock
in the LK_NOWAIT case. In other cases, check after we have slept and
acquired an exlusive lock. This will simulate the old vx_wait()
behavior.
Sponsored by: Isilon Systems, Inc.
against recycling.
- Modify VSHOULDFREE, VCANRECYCLE, etc. now that certain flags are no
longer important. Remove VMIGHTFREE as it is only used in one place.
Sponsored by: Isilon Systems, Inc.
between passes over a QH. Previously the accesses to a QH were
bunched together in time, so the interval was often much longer
than intended. This now appears to match the diagrams in the EHCI
spec, so remove the XXX comment.
to stll be able to mount NFS root as prescribed by DCHP configuration. Since
pxeboot is using TFTP to get to the files, pxeboot can not rely on NFS to
provide it a root directory hande as a side effect. pxeboot has to make RPC
mount call itself.
a serial console anyway because input-device is set to keyboard and
output-device is set to screen but no keyboard is plugged in don't
assume that a device node for the input-device alias exists. While
this is true for RS232 keyboards (the node of the SCC and UART
respectively which controls the keyboard doesn't disappear when no
keyboard is plugged in) this assumption breaks for USB keyboards.
It's most likely also not true for PS/2 keyboards but OFW doesn't
reliably switch to a serial console when the potential keyboard is
a PS/2 one which isn't plugged in so this couldn't be verified
properly.
Reported by: Will Andrews <will@csociety.org>, obrien
MFC after: 1 week
so that the socket lock is held over the test-and-set removal of the
accept filter option during connect, and the two socket mutex regions
(transition to connected, perform accept filter) are combined.
from uipc_socket.c to uipc_accf.c in do_getopt_accept_filter(), so that it
now matches do_setopt_accept_filter(). Slightly reformulate the logic to
match the optimistic allocation of storage for the argument in advance,
and slightly expand the coverage of the socket lock.
OR the physical address with alpha_XXX_dmamap_or to get the DMA address,
like the name of the variable suggests. However, while we were doing
this correctly in the alpha_XXX_dmamap() macro, the busdma code added
the variable to the physical address instead of or'ing it. Fortunately
and if my math is not entirely wrong, you would need more than 128GB of
RAM and a device able to do DMA in 64bits to experience the bug.
Spotted by: cognet
long filename. Each substring is indexed by the windows ID, a
sequential one-based value. The previous code was extremely slow,
doing a malloc/strcpy/free for each substring.
This code optimizes these routines with this in mind, using the ID
to index into a single array and concatenating each WIN_CHARS chunk
at once. (The last chunk is variable-length.)
This code has been tested as working on an FS with difficult filename
sizes (255, 13, 26, etc.) It gives a 77.1% decrease in profiled
time (total across all functions) and a 73.7% decrease in wall time.
Test was "ls -laR > /dev/null".
Per-function time savings:
mbnambuf_init: -90.7%
mbnambuf_write: -18.7%
mbnambuf_flush: -67.1%
MFC after: 1 month
socket lock around knlist_init(), so don't.
Hard code the setting of the socket reference count to 1 rather than
using soref() to avoid asserting the socket lock, since we've not yet
exposed the socket to other threads.
This removes two mutex operations from each socket allocation.
so that the socket does not generate SIGPIPE, only EPIPE, when a write
is attempted after socket shutdown. When the option was introduced in
2002, this required the logic for determining whether SIGPIPE was
generated to be pushed down from dofilewrite() to the socket layer so
that the socket options could be considered. However, the change in
2002 omitted modification to soo_write() required to add that logic,
resulting in SIGPIPE not being generated even without SO_NOSIGPIPE when
the socket was written to using write() or related generic system calls.
This change adds the EPIPE logic to soo_write(), generating a SIGPIPE
signal to the process associated with the passed uio in the event that
the SO_NOSIGPIPE option is not set.
Notes:
- The are upsides and downsides to placing this logic in the socket
layer as opposed to the file descriptor layer. This is really fd
layer logic, but because we need so_options, we have a choice of
layering violations and pick this one.
- SIGPIPE possibly should be delivered to the thread performing the
write, not the process performing the write.
- uio->uio_td and the td argument to soo_write() might potentially
differ; we use the thread in the uio argument.
- The "sigpipe" regression test in src/tools/regression/sockets/sigpipe
tests for the bug.
Submitted by: Mikko Tyolajarvi <mbsd at pacbell dot net>
Talked with: glebius, alfred
PR: 78478
MFC after: 1 week
to syncrhonize access to the data as a result. This makes the pps
less likely to miss the 1ms pulse that I'm feeding it, but not
entirely reliable yet on my 133MHz P5.
Reviewed by: phk
unknown (since my sony vaio didn't :-(.
Instead, fix the problem described by 1.49 in a different way: just
add the two calls I'd hoped I'd avoid in 1.49 by doing the (wrong)
gymnastics there. While 1.49 is a good direction to go in, each step
of the way should work :-(.
resources. When allocating 6 ports for a 4 port range isa code
returns an error. I'm not sure yet why this is the case, but suspect
it is just a non-regularity in how the resource allocation code works
which should be corrected. Use 1 as the ports size in this case.
However, in the hints case, we have to specify the length, so use 6 in
that case. I believe that this is also acpi friendly.
Also, complain when we can't allocate FDOUT register space. Right now we
silently fail when we can't. This failure is referred to above.
When there's no resource for FDCTL, go ahead and allocate one by hand.
Many PNPBIOS tables don't list this resource, and our hints mechanism also
doesn't cover that range. If we can't allocate it, whine, but fake up
something. Before, we were always bogusly faking it and no one noticed
the sham (save the original author who has now fixed his private shame).
per-connection and globally. This eliminates potential DoS attacks
where SACK scoreboard elements tie up too much memory.
Submitted by: Raja Mukerji (raja at moselle dot com).
Reviewed by: Mohan Srinivasan (mohans at yahoo-inc dot com).
asks that each buffer be (2048 * 256) bytes long. I suspect that alignment
isn't a real requirement since busdma only recently started honoring it. The
size is also bogus. Fix both of these and stop busdma from trying to
exhaust the system memory pool with bounce pages.
Submitted by: Kevin Oberman
MFC After: 7 days
- Fix a bug in the same condition where we forgot to drop the ACPI pcib
lock. This fixes hangs after the pcib0 attach on some machines.
Tested by: sos (2)
SIGPIPE signal for the duration of the sento-family syscalls. Use it to
replace previously added hack in Linux layer based on temporarily setting
SO_NOSIGPIPE flag.
Suggested by: alfred
Add support for passing in a mutex. If NULL is passed a global
subr_unit mutex is used.
Add alloc_unrl() which expects the mutex to be held.
Allocating a unit will never sleep as it does not need to allocate
memory.
Cut possible range in half so we can use -1 to mean "out of number".
Collapse first and last runs into the head by means of counters.
This saves memory in the common case(s).
ever working correctly: the code was linking the QHs together but
then immediately overwriting the "next" pointers. Oops. Also
initialise qh_endphub, since the EHCI spec says that we should
always set the pipe multiplier field to something sensible.
This appears to make basic split transactions work, so enable split
transactions for control, bulk and interrupt pipes (split isochronous
transfers are not yet implemented). It should now be possible to
use USB1 devices even when they are connected through a USB2 hub.
seem to be necessary anymore, and it prevents tasting a valid drive
when booting with geom_vinum already loaded, since SCSI disks set their
sectorsize not until first opening them.
from an mbuf into the fxp_encap() function, as done in other drivers.
- Don't waste time calling bus_dmamap_load_mbuf() if we know the mbuf
chain is too long to fit in a TX descriptor, call m_defrag() first.
- Convert fxp(4) to use bus_dmamap_load_mbuf_sg().
for the duration of the send() call. Such approach may be less than ideal
in threading environment, when several threads share the same socket and it
might happen that several of them are calling linux_send() at the same time
with and without SO_NOSIGPIPE set.
However, such race condition is very unlikely in practice, therefore this
change provides practical improvement compared to the previous behaviour.
PR: kern/76426
Submitted by: Steven Hartland <killing@multiplay.co.uk>
MFC after: 3 days
at some point result in a status event being triggered (it should
be a link down event: the Microsoft driver design guide says you
should generate one when the NIC is initialized). Some drivers
generate the event during MiniportInitialize(), such that by the
time MiniportInitialize() completes, the NIC is ready to go. But
some drivers, in particular the ones for Atheros wireless NICs,
don't generate the event until after a device interrupt occurs
at some point after MiniportInitialize() has completed.
The gotcha is that you have to wait until the link status event
occurs one way or the other before you try to fiddle with any
settings (ssid, channel, etc...). For the drivers that set the
event sycnhronously this isn't a problem, but for the others
we have to pause after calling ndis_init_nic() and wait for the event
to arrive before continuing. Failing to wait can cause big trouble:
on my SMP system, calling ndis_setstate_80211() after ndis_init_nic()
completes, but _before_ the link event arrives, will lock up or
reset the system.
What we do now is check to see if a link event arrived while
ndis_init_nic() was running, and if it didn't we msleep() until
it does.
Along the way, I discovered a few other problems:
- Defered procedure calls run at PASSIVE_LEVEL, not DISPATCH_LEVEL.
ntoskrnl_run_dpc() has been fixed accordingly. (I read the documentation
wrong.)
- Similarly, the NDIS interrupt handler, which is essentially a
DPC, also doesn't need to run at DISPATCH_LEVEL. ndis_intrtask()
has been fixed accordingly.
- MiniportQueryInformation() and MiniportSetInformation() run at
DISPATCH_LEVEL, and each request must complete before another
can be submitted. ndis_get_info() and ndis_set_info() have been
fixed accordingly.
- Turned the sleep lock that guards the NDIS thread job list into
a spin lock. We never do anything with this lock held except manage
the job list (no other locks are held), so it's safe to do this,
and it's possible that ndis_sched() and ndis_unsched() can be
called from DISPATCH_LEVEL, so using a sleep lock here is
semantically incorrect. Also updated subr_witness.c to add the
lock to the order list.
- "options" is followed by the characters \040\011, not \011\011.
Correct both my own sins and those of others.
- Comment blocks start and end with an empty line ^#$.
- Remove non-standard comments added in my last commit.
Requested by: njl
Correctness confirmed by: bde
