| Age | Commit message (Collapse) | Author |
|---|
|
Add a generic implementation of the ipc demultiplexer syscall. Except for
s390 and sparc64 all implementations of the sys_ipc are nearly identical.
There are slight differences in the types of the parameters, where mips
and powerpc as the only 64-bit architectures with sys_ipc use unsigned
long for the "third" argument as it gets casted to a pointer later, while
it traditionally is an "int" like most other paramters. frv goes even
further and uses unsigned long for all parameters execept for "ptr" which
is a pointer type everywhere. The change from int to unsigned long for
"third" and back to "int" for the others on frv should be fine due to the
in-register calling conventions for syscalls (we already had a similar
issue with the generic sys_ptrace), but I'd prefer to have the arch
maintainers looks over this in details.
Except for that h8300, m68k and m68knommu lack an impplementation of the
semtimedop sub call which this patch adds, and various architectures have
gets used - at least on i386 it seems superflous as the compat code on
x86-64 and ia64 doesn't even bother to implement it.
[akpm@linux-foundation.org: add sys_ipc to sys_ni.c]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Hirokazu Takata <takata@linux-m32r.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Reviewed-by: H. Peter Anvin <hpa@zytor.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: James Morris <jmorris@namei.org>
Cc: Andreas Schwab <schwab@linux-m68k.org>
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: David Howells <dhowells@redhat.com>
Acked-by: Kyle McMartin <kyle@mcmartin.ca>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
|
Largely inspired from ipc/ipc_sysctl.c. This patch isolates the mqueue
sysctl stuff in its own file.
[akpm@linux-foundation.org: build fix]
Signed-off-by: Cedric Le Goater <clg@fr.ibm.com>
Signed-off-by: Nadia Derbey <Nadia.Derbey@bull.net>
Signed-off-by: Serge E. Hallyn <serue@us.ibm.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
|
Introduce a notification mechanism that aims at recomputing msgmni each time
an ipc namespace is created or removed.
The ipc namespace notifier chain already defined for memory hotplug management
is used for that purpose too.
Each time a new ipc namespace is allocated or an existing ipc namespace is
removed, the ipcns notifier chain is notified. The callback routine for each
registered ipc namespace is then activated in order to recompute msgmni for
that namespace.
Signed-off-by: Nadia Derbey <Nadia.Derbey@bull.net>
Cc: Yasunori Goto <y-goto@jp.fujitsu.com>
Cc: Matt Helsley <matthltc@us.ibm.com>
Cc: Mingming Cao <cmm@us.ibm.com>
Cc: Pierre Peiffer <pierre.peiffer@bull.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
|
Introduce the registration of a callback routine that recomputes msg_ctlmni
upon memory add / remove.
A single notifier block is registered in the hotplug memory chain for all the
ipc namespaces.
Since the ipc namespaces are not linked together, they have their own
notification chain: one notifier_block is defined per ipc namespace.
Each time an ipc namespace is created (removed) it registers (unregisters) its
notifier block in (from) the ipcns chain. The callback routine registered in
the memory chain invokes the ipcns notifier chain with the IPCNS_LOWMEM event.
Each callback routine registered in the ipcns namespace, in turn, recomputes
msgmni for the owning namespace.
Signed-off-by: Nadia Derbey <Nadia.Derbey@bull.net>
Cc: Yasunori Goto <y-goto@jp.fujitsu.com>
Cc: Matt Helsley <matthltc@us.ibm.com>
Cc: Mingming Cao <cmm@us.ibm.com>
Cc: Pierre Peiffer <pierre.peiffer@bull.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
|
Currently the IPC namespace management code is spread over the ipc/*.c files.
I moved this code into ipc/namespace.c file which is compiled out when needed.
The linux/ipc_namespace.h file is used to store the prototypes of the
functions in namespace.c and the stubs for NAMESPACES=n case. This is done
so, because the stub for copy_ipc_namespace requires the knowledge of the
CLONE_NEWIPC flag, which is in sched.h. But the linux/ipc.h file itself in
included into many many .c files via the sys.h->sem.h sequence so adding the
sched.h into it will make all these .c depend on sched.h which is not that
good. On the other hand the knowledge about the namespaces stuff is required
in 4 .c files only.
Besides, this patch compiles out some auxiliary functions from ipc/sem.c,
msg.c and shm.c files. It turned out that moving these functions into
namespaces.c is not that easy because they use many other calls and macros
from the original file. Moving them would make this patch complicated. On
the other hand all these functions can be consolidated, so I will send a
separate patch doing this a bit later.
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Cc: Cedric Le Goater <clg@fr.ibm.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Herbert Poetzl <herbert@13thfloor.at>
Cc: Kirill Korotaev <dev@sw.ru>
Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
|
This is just a simple cleanup to keep kernel/sysctl.c from getting to crowded
with special cases, and by keeping all of the ipc logic to together it makes
the code a little more readable.
[gcoady.lk@gmail.com: build fix]
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: Serge E. Hallyn <serue@us.ibm.com>
Cc: Herbert Poetzl <herbert@13thfloor.at>
Cc: Kirill Korotaev <dev@sw.ru>
Signed-off-by: Grant Coady <gcoady.lk@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
|
From: Arnd Bergmann <arnd@arndb.de>
I have tested the code with the open posix test suite and found the same
four failures for both 64-bit and compat mode, most tests pass. The patch
is against -mc1, but I guess it also applies to the other trees around.
What worries me more than mq_attr compatibility is the conversion of struct
sigevent, which might turn out really hard when more fields in there are
used. AFAICS, the only other part in the kernel ABI is sys_timer_create(),
so maybe it's not too late to deprecate the current structure and create a
structure that can be used properly for compat syscalls.
|
|
From: Manfred Spraul <manfred@colorfullife.com>
Actual implementation of the posix message queues, written by Krzysztof
Benedyczak and Michal Wronski. The complete implementation is dependant on
CONFIG_POSIX_MQUEUE.
It passed the openposix test suite with two exceptions: one mq_unlink test
was bad and tested undefined behavior. And Linux succeeds
mq_close(open(,,,)). The spec mandates EBADF, but we have decided to ignore
that: we would have to add a new syscall just for the right error code.
The patch intentionally doesn't use all helpers from fs/libfs for kernel-only
filesystems: step 5 allows user space mounts of the file system.
Signal changes:
The patch redefines SI_MESGQ using __SI_CODE: The generic Linux ABI uses
a negative value (i.e. from user) for SI_MESGQ, but the kernel internal
value must be posive to pass check_kill_value. Additionally, the patch
adds support into copy_siginfo_to_user to copy the "new" signal type to
user space.
Changes in signal code caused by POSIX message queues patch:
General & rationale:
mqueues generated signals (only upon notification) must have si_code
== SI_MESGQ. In fact such a signal is send from one process which
caused notification (== sent message to empty message queue) to
another which requested it. Both processes can be of course unrelated
in terms of uids/euids. So SI_MESGQ signals must be classified as
SI_FROMKERNEL to pass check_kill_permissions (not need to say that
this signals ARE from kernel).
Signals generated by message queues notification need the same
fields in siginfo struct's union _sifields as POSIX.1b signals and we
can reuse its union entry.
SI_MESGQ was previously defined to -3 in kernel and also in glibc.
So in userspace SI_MESGQ must be still visible as -3.
Solution:
SI_MESGQ is defined in the same style as SI_TIMER using __SI_CODE macro.
Details:
Fortunately copy_siginfo_to_user copies si_code as short. So we
can use remaining part of int value freely. __SI_CODE does the
work. SI_MESGQ is in kernel:
6<<16 | (-3 & 0xffff) what is > 0
but to userspace is copied
(short) SI_MESGQ == -3
Actual changes:
Changes in include/asm-generic/siginfo.h
__SI_MESGQ added in signal.h to represent inside-kernel prefix of
SI_MESGQ. SI_MESGQ is redefined from -3 to __SI_CODE(__SI_MESGQ, -3)
Except mips architecture those changes should be arch independent
(asm-generic/siginfo.h is included in arch versions). On mips
SI_MESGQ is redefined to -4 in order to be compatible with IRIX. But
the same schema can be used.
Change in copy_siginfo_to_user: We only add one line to order the
same copy semantics as for _SI_RT.
This change isn't very portable - some arch have its own
copy_siginfo_to_user. All those should have similar change (but
possibly not one-line as _SI_RT case was sometimes ignored because i
wasn't used yet, e.g. see ia64 signal.c).
Update:
mq: only fail with invalid timespec if mq_timed{send,receive} needs to block
From: Jakub Jelinek <jakub@redhat.com>
POSIX requires EINVAL to be set if:
"The process or thread would have blocked, and the abs_timeout parameter
specified a nanoseconds field value less than zero or greater than or equal
to 1000 million."
but 2.6.5-mm3 returns -EINVAL even if the process or thread would not block
(if the queue is not empty for timedreceive or not full for timedsend).
|
|
From: Manfred Spraul <manfred@colorfullife.com>
cleanup of sysv ipc as a preparation for posix message queues:
- replace !CONFIG_SYSVIPC wrappers for copy_semundo and exit_sem with
static inline wrappers. Now the whole ipc/util.c file is only used if
CONFIG_SYSVIPC is set, use makefile magic instead of #ifdef.
- remove the prototypes for copy_semundo and exit_sem from kernel/fork.c
- they belong into a header file.
- create a new msgutil.c with the helper functions for message queues.
- cleanup the helper functions: run Lindent, add __user tags.
|
|
From: Arnd Bergmann <arnd@arndb.de>
Adds a generic implementation of 32 bit emulation for IPC system calls. The
code is based on the existing implementations for sparc64, ia64, mips, s390,
ppc and x86_64, which can subsequently be converted to use this.
|
|
Makefiles no longer need to include Rules.make, which is currently an
empty file. This patch removes it from the remaining Makefiles, and
removes the empty Rules.make file.
|
|
It's gone almost everywhere else already, and will eventually make for
a nicer top-level Makefile.
|
|
|
