sleeps/timeout may have left spourious lk_exslpfail counts on, so clean
it up even when accessing a shared queue acquisition, giving to
lk_exslpfail the value of 'upper limit'.
In the worst case scenario, infact (mixed
interruptible sleep / LK_SLEEPFAIL waiters) what may happen is that both
queues are awaken even if that's not necessary, but still no harm.
Reported by: Lucius Windschuh <lwindschuh at googlemail dot com>
Reviewed by: kib
Tested by: pho, Lucius Windschuh <lwindschuh at googlemail dot com>
cylinder group of a UFS1 filesystem as bad. The error was in the check
and not in the cylinder group itself. So even though fsck fixed the
cylinder group correctly, it was still endlessly reported as bad.
PR: 141992
MFC after: 2 weeks
Reported by: Dan Strick
for each vdev's status. Booting from a degraded vdev should now be
more robust.
Submitted by: Matt Reimer <mattjreimer at gmail.com>
Sponsored by: VPOP Technologies, Inc.
MFC after: 2 weeks
more efficiently.
Before this patch, in the worst case memory use would increase
exponentially on the number of drives in the raidz vdev.
Submitted by: Matt Reimer <mattjreimer@gmail.com>
Sponsored by: VPOP Technologies, Inc.
Silence from: dfr
command in the usb_msctest routines, as well as a general tidyup.
This now properly ejects the ZTE MF636, Option Gi0322 and Novatel MC950D
devices I have on my desk.
when trees were big and FAST mode was enabled by default.
So small block size doesn't benefits linear I/O operations in FAST and
significantly slowdowns in ECONOMIC (default) mode. For single stream random
I/Os so small block doesn't give much benefits, as access time is usually
bigger then transfer time there. Same time it requires all heads to seek
together for every single request, reducing performance on parallel load.
zero stripeoffset in such case (as if device has no stripes), report offset
from the beginning of the media (as if device has single infinite stripe).
This gives partitioning tools information, required to guess better
partition alignment, in case if hardware doesn't report it's stripe size.
For example, it should give disklabel info about odd offset made by fdisk.
2) Deregister.
3) New style function definitions.
Some WARNS still remain here - some printf format warning on some
arches and the compiler can't see that a variable should always be
initialised.
are not used uninitialised.
2) Fix some constness problems.
3) Avoid a signedness problem by casting to size_t. If bn != stuff,
than stuff-1-bn should be > 0.
pci_delete_child() function called by the cardbus driver. The new function
uses resource_list_unreserve() to release the BARs decoded by the device
being removed.
Reviewed by: imp
Tested by: brooks
This should fix some Thinkpad specific problems such as
connecting to a headphone jack is not functional on X41.
Reviewed by: takawata
MFC after: 1 week
alphasort-like interface to the comparision function required by
qsort() and qsort_r().
For opendir() thunk and alphasort(), comment on why we deviated from
POSIX by using strcmp() instead of strcoll().
Requested and reviewed by: bde
MFC after: 2 weeks
now type sema_t is a structure which can be put in a shared memory area,
and multiple processes can operate it concurrently.
User can either use mmap(MAP_SHARED) + sem_init(pshared=1) or use sem_open()
to initialize a shared semaphore.
Named semaphore uses file system and is located in /tmp directory, and its
file name is prefixed with 'SEMD', so now it is chroot or jail friendly.
In simplist cases, both for named and un-named semaphore, userland code
does not have to enter kernel to reduce/increase semaphore's count.
The semaphore is designed to be crash-safe, it means even if an application
is crashed in the middle of operating semaphore, the semaphore state is
still safely recovered by later use, there is no waiter counter maintained
by userland code.
The main semaphore code is in libc and libthr only has some necessary stubs,
this makes it possible that a non-threaded application can use semaphore
without linking to thread library.
Old semaphore implementation is kept libc to maintain binary compatibility.
The kernel ksem API is no longer used in the new implemenation.
Discussed on: threads@
