wakeup all of the sleeping threads when we free only one buffer. This
avoids us having to needlessly try again (and fail, and go back to
sleep) for all the threads sleeping. We will now only wakeup the
thread we know will succeed.
Reviewed by: green
freelist. Should now be thread-friendly, in part.
Note: More work is needed in uipc_syscalls.c, but it will have to wait until
the socket locking issues are at least 80% implemented and committed.
getnewvnode(). Otherwise routines called from VOP_INACTIVE() might
attempt to remove the vnode from a free list the vnode isn't on,
causing corruption.
PR: 18012
This removes support for booting current kernels with very old bootblocks.
Device driver writers: Please remove initializations for the d_bmaj
field in your cdevsw{}.
current implementation, jail neither virtualizes the Sys V IPC namespace,
nor provides inter-jail protections on IPC objects.
o Support for System V IPC can be enabled by setting jail.sysvipc_allowed=1
using sysctl.
o This is not the "real fix" which involves virtualizing the System V
IPC namespace, but prevents processes within jail from influencing those
outside of jail when not approved by the administrator.
Reported by: Paulo Fragoso <paulo@nlink.com.br>
in the p_candebug() function. Synchronize with sef's CHECKIO()
macro from the old procfs, which seems to be a good source of security
checks.
Obtained from: TrustedBSD Project
This allows writing to DVD-RAM, PD and similar drives that probe as CD
devices. Note that these are randomly writeable devices, not
sequential-only devices like CD-R drives, which are supported by cdrecord.
Add a new flag value for dsopen(), DSO_COMPATLABEL. The cd(4) driver now
uses this flag instead of the DSO_NOLABELS flag. The DSO_NOLABELS always
used a "fake" disklabel for the entire disk, provided by the caller.
With the DSO_COMPATLABEL flag, dsopen() will first search the media for a
label, and if it finds a label, it will use that label. Otherwise it will
use the fake disklabel provided by the caller. This provides backwards
compatibility, since we will still have labels for ISO9660 media.
It also provides new functionality, since you can now have a regular BSD
disklabel on read-only media, or on writeable media (e.g. DVD-RAM).
Bruce and I both think that we should eventually (in a few years) get
away from using disklabels for ISO9660 media, and just use the whole disk
device (/dev/cd0). At that point disklabel handling in the cd(4) driver
could follow the "normal" model, as used in the da(4) driver.
Also, clean up the path in a couple of places in cdregister(). (Thanks to
Nick Hibma for catching that bug.)
Reviewed by: bde
Otherwise, aio_read() and aio_write() on sockets are broken if a kevent is
registered. (The code after kevent registration for handling sockets assumes
that the struct file pointer "fp" still refers to the socket, not the kqueue.)
<sys/proc.h> to <sys/systm.h>.
Correctly document the #includes needed in the manpage.
Add one now needed #include of <sys/systm.h>.
Remove the consequent 48 unused #includes of <sys/proc.h>.
because it only takes a struct tag which makes it impossible to
use unions, typedefs etc.
Define __offsetof() in <machine/ansi.h>
Define offsetof() in terms of __offsetof() in <stddef.h> and <sys/types.h>
Remove myriad of local offsetof() definitions.
Remove includes of <stddef.h> in kernel code.
NB: Kernelcode should *never* include from /usr/include !
Make <sys/queue.h> include <machine/ansi.h> to avoid polluting the API.
Deprecate <struct.h> with a warning. The warning turns into an error on
01-12-2000 and the file gets removed entirely on 01-01-2001.
Paritials reviews by: various.
Significant brucifications by: bde
it can function before malloc(9) is up and running.
- Add two new options WITNESS_DDB and WITNESS_SKIPSPIN. If WITNESS_SKIPSPIN
is enabled, then spin mutexes are ignored by the WITNESS code. If
WITNESS_DDB is turned on and DDB is compiled into the kernel, then the
kernel will drop into DDB when either a lock hierarchy violation occurs
or mutexes are held when going to sleep.
- Add some new sysctls:
debug.witness_ddb is a read-write sysctl that corresponds to WITNESS_DDB.
The kernel option merely changes the default value to on at boot.
debug.witness_skipspin is a read-only sysctl that one can use to determine
if the kernel was compiled with WITNESS_SKIPSPIN.
- Wipe out the BSD/OS-specific lock order lists. We get to build our own
lists now as we add mutexes to the kernel.
type of software interrupt. Roughly, what used to be a bit in spending
now maps to a swi thread. Each thread can have multiple handlers, just
like a hardware interrupt thread.
- Instead of using a bitmask of pending interrupts, we schedule the specific
software interrupt thread to run, so spending, NSWI, and the shandlers
array are no longer needed. We can now have an arbitrary number of
software interrupt threads. When you register a software interrupt
thread via sinthand_add(), you get back a struct intrhand that you pass
to sched_swi() when you wish to schedule your swi thread to run.
- Convert the name of 'struct intrec' to 'struct intrhand' as it is a bit
more intuitive. Also, prefix all the members of struct intrhand with
'ih_'.
- Make swi_net() a MI function since there is now no point in it being
MD.
Submitted by: cp
Instead of:
foo = malloc(sizeof(foo), M_WAIT);
bzero(foo, sizeof(foo));
You can now (and please do) use:
foo = malloc(sizeof(foo), M_WAIT | M_ZERO);
In the future this will enable us to do idle-time pre-zeroing of
malloc-space.
reducues the maintenance load for the mutex code. The only MD portions
of the mutex code are in machine/mutex.h now, which include the assembly
macros for handling mutexes as well as optionally overriding the mutex
micro-operations. For example, we use optimized micro-ops on the x86
platform #ifndef I386_CPU.
- Change the behavior of the SMP_DEBUG kernel option. In the new code,
mtx_assert() only depends on INVARIANTS, allowing other kernel developers
to have working mutex assertiions without having to include all of the
mutex debugging code. The SMP_DEBUG kernel option has been renamed to
MUTEX_DEBUG and now just controls extra mutex debugging code.
- Abolish the ugly mtx_f hack. Instead, we dynamically allocate
seperate mtx_debug structures on the fly in mtx_init, except for mutexes
that are initiated very early in the boot process. These mutexes
are declared using a special MUTEX_DECLARE() macro, and use a new
flag MTX_COLD when calling mtx_init. This is still somewhat hackish,
but it is less evil than the mtx_f filler struct, and the mtx struct is
now the same size with and without mutex debugging code.
- Add some micro-micro-operation macros for doing the actual atomic
operations on the mutex mtx_lock field to make it easier for other archs
to override/optimize mutex ops if needed. These new tiny ops also clean
up the code in some places by replacing long atomic operation function
calls that spanned 2-3 lines with a short 1-line macro call.
- Don't call mi_switch() from mtx_enter_hard() when we block while trying
to obtain a sleep mutex. Calling mi_switch() would bogusly release
Giant before switching to the next process. Instead, inline most of the
code from mi_switch() in the mtx_enter_hard() function. Note that when
we finally kill Giant we can back this out and go back to calling
mi_switch().
"administrative" authorization checks. In most cases, the VADMIN test
checks to make sure the credential effective uid is the same as the file
owner.
o Modify vaccess() to set VADMIN as an available right if the uid is
appropriate.
o Modify references to uid-based access control operations such that they
now always invoke VOP_ACCESS() instead of using hard-coded policy checks.
o This allows alternative UFS policies to be implemented by replacing only
ufs_access() (such as mandatory system policies).
o VOP_ACCESS() requires the caller to hold an exclusive vnode lock on the
vnode: I believe that new invocations of VOP_ACCESS() are always called
with the lock held.
o Some direct checks of the uid remain, largely associated with the QUOTA
and SUIDDIR code.
Reviewed by: eivind
Obtained from: TrustedBSD Project
implementation.
Add bus_generic_rl_{get,set,delete,release,alloc}_resource() functions
which provide generic operations for devices using resource list style
resource management.
This should simplify a number of bus drivers. Further commits to follow.
This was implemented by Shigeru YAMAMOTO-san and Jonathan Chen. I've
cleaned them up somewhat and they seem to work well enough to boot
current (but given current's state it can be hard to tell). Doug
Rabson also reviewed the design and signed off on it.
number of ext_buf counters that are possibly allocatable.
Do this because:
(i) It will make it easier to influence EXT_COUNTERS for if_sk,
if_ti (or similar) users where the driver allocates its own
ext_bufs and where it is important for the mbuf system to take
it into account when reserving necessary space for counters.
(ii) Facilitate some percentile calculation for netstat(1)
u_int64_t flag field, bounding the number of capabilities at 64,
but substantially cleaning up capability logic (there are currently
43 defined capabilities).
o Heads up to anyone actually using capabilities: the constant
assignments for various capabilities have been redone, so any
persistent binary capability stores (i.e., '$posix1e.cap' EA
backing files) must be recreated. If you have one of these,
you'll know about it, so if you have no idea what this means,
don't worry.
o Update libposix1e to reflect this new definition, fixing the
exposed functions that directly manipulate the flags fields.
Obtained from: TrustedBSD Project
and initialized during boot. This avoids bloating sizeof(struct lock).
As a side effect, it is no longer necessary to enforce the assumtion that
lockinit()/lockdestroy() calls are paired, so the LK_VALID flag has been
removed.
Idea taken from: BSD/OS.
