2006-09-21 20:28:01 -06:00
|
|
|
/*
|
|
|
|
* dccp_probe - Observe the DCCP flow with kprobes.
|
|
|
|
*
|
|
|
|
* The idea for this came from Werner Almesberger's umlsim
|
|
|
|
* Copyright (C) 2004, Stephen Hemminger <shemminger@osdl.org>
|
|
|
|
*
|
|
|
|
* Modified for DCCP from Stephen Hemminger's code
|
|
|
|
* Copyright (C) 2006, Ian McDonald <ian.mcdonald@jandi.co.nz>
|
|
|
|
*
|
|
|
|
* This program is free software; you can redistribute it and/or modify
|
|
|
|
* it under the terms of the GNU General Public License as published by
|
|
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
|
|
* (at your option) any later version.
|
|
|
|
*
|
|
|
|
* This program is distributed in the hope that it will be useful,
|
|
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
|
|
* GNU General Public License for more details.
|
|
|
|
*
|
|
|
|
* You should have received a copy of the GNU General Public License
|
|
|
|
* along with this program; if not, write to the Free Software
|
|
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/kernel.h>
|
|
|
|
#include <linux/kprobes.h>
|
|
|
|
#include <linux/socket.h>
|
|
|
|
#include <linux/dccp.h>
|
|
|
|
#include <linux/proc_fs.h>
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/kfifo.h>
|
|
|
|
#include <linux/vmalloc.h>
|
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 02:04:11 -06:00
|
|
|
#include <linux/gfp.h>
|
2007-09-12 04:01:34 -06:00
|
|
|
#include <net/net_namespace.h>
|
2006-09-21 20:28:01 -06:00
|
|
|
|
|
|
|
#include "dccp.h"
|
|
|
|
#include "ccid.h"
|
|
|
|
#include "ccids/ccid3.h"
|
|
|
|
|
|
|
|
static int port;
|
|
|
|
|
|
|
|
static int bufsize = 64 * 1024;
|
|
|
|
|
|
|
|
static const char procname[] = "dccpprobe";
|
|
|
|
|
2008-06-11 04:19:09 -06:00
|
|
|
static struct {
|
kfifo: move struct kfifo in place
This is a new generic kernel FIFO implementation.
The current kernel fifo API is not very widely used, because it has to
many constrains. Only 17 files in the current 2.6.31-rc5 used it.
FIFO's are like list's a very basic thing and a kfifo API which handles
the most use case would save a lot of development time and memory
resources.
I think this are the reasons why kfifo is not in use:
- The API is to simple, important functions are missing
- A fifo can be only allocated dynamically
- There is a requirement of a spinlock whether you need it or not
- There is no support for data records inside a fifo
So I decided to extend the kfifo in a more generic way without blowing up
the API to much. The new API has the following benefits:
- Generic usage: For kernel internal use and/or device driver.
- Provide an API for the most use case.
- Slim API: The whole API provides 25 functions.
- Linux style habit.
- DECLARE_KFIFO, DEFINE_KFIFO and INIT_KFIFO Macros
- Direct copy_to_user from the fifo and copy_from_user into the fifo.
- The kfifo itself is an in place member of the using data structure, this save an
indirection access and does not waste the kernel allocator.
- Lockless access: if only one reader and one writer is active on the fifo,
which is the common use case, no additional locking is necessary.
- Remove spinlock - give the user the freedom of choice what kind of locking to use if
one is required.
- Ability to handle records. Three type of records are supported:
- Variable length records between 0-255 bytes, with a record size
field of 1 bytes.
- Variable length records between 0-65535 bytes, with a record size
field of 2 bytes.
- Fixed size records, which no record size field.
- Preserve memory resource.
- Performance!
- Easy to use!
This patch:
Since most users want to have the kfifo as part of another object,
reorganize the code to allow including struct kfifo in another data
structure. This requires changing the kfifo_alloc and kfifo_init
prototypes so that we pass an existing kfifo pointer into them. This
patch changes the implementation and all existing users.
[akpm@linux-foundation.org: fix warning]
Signed-off-by: Stefani Seibold <stefani@seibold.net>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Acked-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-12-21 15:37:26 -07:00
|
|
|
struct kfifo fifo;
|
2006-09-21 20:28:01 -06:00
|
|
|
spinlock_t lock;
|
|
|
|
wait_queue_head_t wait;
|
2008-04-21 15:28:45 -06:00
|
|
|
struct timespec tstart;
|
2006-09-21 20:28:01 -06:00
|
|
|
} dccpw;
|
|
|
|
|
|
|
|
static void printl(const char *fmt, ...)
|
|
|
|
{
|
|
|
|
va_list args;
|
|
|
|
int len;
|
2008-04-21 15:28:45 -06:00
|
|
|
struct timespec now;
|
2006-09-21 20:28:01 -06:00
|
|
|
char tbuf[256];
|
|
|
|
|
|
|
|
va_start(args, fmt);
|
2008-04-21 15:28:45 -06:00
|
|
|
getnstimeofday(&now);
|
2006-09-21 20:28:01 -06:00
|
|
|
|
2008-04-21 15:28:45 -06:00
|
|
|
now = timespec_sub(now, dccpw.tstart);
|
2006-09-21 20:28:01 -06:00
|
|
|
|
|
|
|
len = sprintf(tbuf, "%lu.%06lu ",
|
|
|
|
(unsigned long) now.tv_sec,
|
2008-04-21 15:28:45 -06:00
|
|
|
(unsigned long) now.tv_nsec / NSEC_PER_USEC);
|
2006-09-21 20:28:01 -06:00
|
|
|
len += vscnprintf(tbuf+len, sizeof(tbuf)-len, fmt, args);
|
|
|
|
va_end(args);
|
|
|
|
|
2009-12-21 15:37:28 -07:00
|
|
|
kfifo_in_locked(&dccpw.fifo, tbuf, len, &dccpw.lock);
|
2006-09-21 20:28:01 -06:00
|
|
|
wake_up(&dccpw.wait);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int jdccp_sendmsg(struct kiocb *iocb, struct sock *sk,
|
|
|
|
struct msghdr *msg, size_t size)
|
|
|
|
{
|
|
|
|
const struct inet_sock *inet = inet_sk(sk);
|
2009-10-04 18:53:13 -06:00
|
|
|
struct ccid3_hc_tx_sock *hc = NULL;
|
2006-09-21 20:28:01 -06:00
|
|
|
|
2008-11-23 17:04:59 -07:00
|
|
|
if (ccid_get_current_tx_ccid(dccp_sk(sk)) == DCCPC_CCID3)
|
2009-10-04 18:53:13 -06:00
|
|
|
hc = ccid3_hc_tx_sk(sk);
|
2006-09-21 20:28:01 -06:00
|
|
|
|
2009-10-15 00:30:45 -06:00
|
|
|
if (port == 0 || ntohs(inet->inet_dport) == port ||
|
|
|
|
ntohs(inet->inet_sport) == port) {
|
2009-10-04 18:53:13 -06:00
|
|
|
if (hc)
|
2009-10-04 18:53:11 -06:00
|
|
|
printl("%pI4:%u %pI4:%u %d %d %d %d %u %llu %llu %d\n",
|
2009-10-15 00:30:45 -06:00
|
|
|
&inet->inet_saddr, ntohs(inet->inet_sport),
|
|
|
|
&inet->inet_daddr, ntohs(inet->inet_dport), size,
|
2009-10-04 18:53:13 -06:00
|
|
|
hc->tx_s, hc->tx_rtt, hc->tx_p,
|
|
|
|
hc->tx_x_calc, hc->tx_x_recv >> 6,
|
|
|
|
hc->tx_x >> 6, hc->tx_t_ipi);
|
2006-09-21 20:28:01 -06:00
|
|
|
else
|
2008-10-31 01:54:56 -06:00
|
|
|
printl("%pI4:%u %pI4:%u %d\n",
|
2009-10-15 00:30:45 -06:00
|
|
|
&inet->inet_saddr, ntohs(inet->inet_sport),
|
|
|
|
&inet->inet_daddr, ntohs(inet->inet_dport),
|
|
|
|
size);
|
2006-09-21 20:28:01 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
jprobe_return();
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct jprobe dccp_send_probe = {
|
2006-11-20 13:41:37 -07:00
|
|
|
.kp = {
|
|
|
|
.symbol_name = "dccp_sendmsg",
|
|
|
|
},
|
2007-07-19 02:48:10 -06:00
|
|
|
.entry = jdccp_sendmsg,
|
2006-09-21 20:28:01 -06:00
|
|
|
};
|
|
|
|
|
|
|
|
static int dccpprobe_open(struct inode *inode, struct file *file)
|
|
|
|
{
|
kfifo: move struct kfifo in place
This is a new generic kernel FIFO implementation.
The current kernel fifo API is not very widely used, because it has to
many constrains. Only 17 files in the current 2.6.31-rc5 used it.
FIFO's are like list's a very basic thing and a kfifo API which handles
the most use case would save a lot of development time and memory
resources.
I think this are the reasons why kfifo is not in use:
- The API is to simple, important functions are missing
- A fifo can be only allocated dynamically
- There is a requirement of a spinlock whether you need it or not
- There is no support for data records inside a fifo
So I decided to extend the kfifo in a more generic way without blowing up
the API to much. The new API has the following benefits:
- Generic usage: For kernel internal use and/or device driver.
- Provide an API for the most use case.
- Slim API: The whole API provides 25 functions.
- Linux style habit.
- DECLARE_KFIFO, DEFINE_KFIFO and INIT_KFIFO Macros
- Direct copy_to_user from the fifo and copy_from_user into the fifo.
- The kfifo itself is an in place member of the using data structure, this save an
indirection access and does not waste the kernel allocator.
- Lockless access: if only one reader and one writer is active on the fifo,
which is the common use case, no additional locking is necessary.
- Remove spinlock - give the user the freedom of choice what kind of locking to use if
one is required.
- Ability to handle records. Three type of records are supported:
- Variable length records between 0-255 bytes, with a record size
field of 1 bytes.
- Variable length records between 0-65535 bytes, with a record size
field of 2 bytes.
- Fixed size records, which no record size field.
- Preserve memory resource.
- Performance!
- Easy to use!
This patch:
Since most users want to have the kfifo as part of another object,
reorganize the code to allow including struct kfifo in another data
structure. This requires changing the kfifo_alloc and kfifo_init
prototypes so that we pass an existing kfifo pointer into them. This
patch changes the implementation and all existing users.
[akpm@linux-foundation.org: fix warning]
Signed-off-by: Stefani Seibold <stefani@seibold.net>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Acked-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-12-21 15:37:26 -07:00
|
|
|
kfifo_reset(&dccpw.fifo);
|
2008-04-21 15:28:45 -06:00
|
|
|
getnstimeofday(&dccpw.tstart);
|
2006-09-21 20:28:01 -06:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t dccpprobe_read(struct file *file, char __user *buf,
|
|
|
|
size_t len, loff_t *ppos)
|
|
|
|
{
|
|
|
|
int error = 0, cnt = 0;
|
|
|
|
unsigned char *tbuf;
|
|
|
|
|
2007-05-31 22:33:35 -06:00
|
|
|
if (!buf)
|
2006-09-21 20:28:01 -06:00
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
if (len == 0)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
tbuf = vmalloc(len);
|
|
|
|
if (!tbuf)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
error = wait_event_interruptible(dccpw.wait,
|
2009-12-21 15:37:28 -07:00
|
|
|
kfifo_len(&dccpw.fifo) != 0);
|
2006-09-21 20:28:01 -06:00
|
|
|
if (error)
|
|
|
|
goto out_free;
|
|
|
|
|
2009-12-21 15:37:28 -07:00
|
|
|
cnt = kfifo_out_locked(&dccpw.fifo, tbuf, len, &dccpw.lock);
|
2008-04-25 02:49:48 -06:00
|
|
|
error = copy_to_user(buf, tbuf, cnt) ? -EFAULT : 0;
|
2006-09-21 20:28:01 -06:00
|
|
|
|
|
|
|
out_free:
|
|
|
|
vfree(tbuf);
|
|
|
|
|
|
|
|
return error ? error : cnt;
|
|
|
|
}
|
|
|
|
|
2007-02-12 01:55:35 -07:00
|
|
|
static const struct file_operations dccpprobe_fops = {
|
2006-09-21 20:28:01 -06:00
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.open = dccpprobe_open,
|
|
|
|
.read = dccpprobe_read,
|
|
|
|
};
|
|
|
|
|
|
|
|
static __init int dccpprobe_init(void)
|
|
|
|
{
|
|
|
|
int ret = -ENOMEM;
|
|
|
|
|
|
|
|
init_waitqueue_head(&dccpw.wait);
|
|
|
|
spin_lock_init(&dccpw.lock);
|
2009-12-21 15:37:27 -07:00
|
|
|
if (kfifo_alloc(&dccpw.fifo, bufsize, GFP_KERNEL))
|
kfifo: move struct kfifo in place
This is a new generic kernel FIFO implementation.
The current kernel fifo API is not very widely used, because it has to
many constrains. Only 17 files in the current 2.6.31-rc5 used it.
FIFO's are like list's a very basic thing and a kfifo API which handles
the most use case would save a lot of development time and memory
resources.
I think this are the reasons why kfifo is not in use:
- The API is to simple, important functions are missing
- A fifo can be only allocated dynamically
- There is a requirement of a spinlock whether you need it or not
- There is no support for data records inside a fifo
So I decided to extend the kfifo in a more generic way without blowing up
the API to much. The new API has the following benefits:
- Generic usage: For kernel internal use and/or device driver.
- Provide an API for the most use case.
- Slim API: The whole API provides 25 functions.
- Linux style habit.
- DECLARE_KFIFO, DEFINE_KFIFO and INIT_KFIFO Macros
- Direct copy_to_user from the fifo and copy_from_user into the fifo.
- The kfifo itself is an in place member of the using data structure, this save an
indirection access and does not waste the kernel allocator.
- Lockless access: if only one reader and one writer is active on the fifo,
which is the common use case, no additional locking is necessary.
- Remove spinlock - give the user the freedom of choice what kind of locking to use if
one is required.
- Ability to handle records. Three type of records are supported:
- Variable length records between 0-255 bytes, with a record size
field of 1 bytes.
- Variable length records between 0-65535 bytes, with a record size
field of 2 bytes.
- Fixed size records, which no record size field.
- Preserve memory resource.
- Performance!
- Easy to use!
This patch:
Since most users want to have the kfifo as part of another object,
reorganize the code to allow including struct kfifo in another data
structure. This requires changing the kfifo_alloc and kfifo_init
prototypes so that we pass an existing kfifo pointer into them. This
patch changes the implementation and all existing users.
[akpm@linux-foundation.org: fix warning]
Signed-off-by: Stefani Seibold <stefani@seibold.net>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Acked-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-12-21 15:37:26 -07:00
|
|
|
return ret;
|
2007-09-12 04:01:34 -06:00
|
|
|
if (!proc_net_fops_create(&init_net, procname, S_IRUSR, &dccpprobe_fops))
|
2006-09-21 20:28:01 -06:00
|
|
|
goto err0;
|
|
|
|
|
2010-02-02 13:16:56 -07:00
|
|
|
try_then_request_module((ret = register_jprobe(&dccp_send_probe)) == 0,
|
|
|
|
"dccp");
|
2006-09-21 20:28:01 -06:00
|
|
|
if (ret)
|
|
|
|
goto err1;
|
|
|
|
|
|
|
|
pr_info("DCCP watch registered (port=%d)\n", port);
|
|
|
|
return 0;
|
|
|
|
err1:
|
2007-09-12 04:01:34 -06:00
|
|
|
proc_net_remove(&init_net, procname);
|
2006-09-21 20:28:01 -06:00
|
|
|
err0:
|
kfifo: move struct kfifo in place
This is a new generic kernel FIFO implementation.
The current kernel fifo API is not very widely used, because it has to
many constrains. Only 17 files in the current 2.6.31-rc5 used it.
FIFO's are like list's a very basic thing and a kfifo API which handles
the most use case would save a lot of development time and memory
resources.
I think this are the reasons why kfifo is not in use:
- The API is to simple, important functions are missing
- A fifo can be only allocated dynamically
- There is a requirement of a spinlock whether you need it or not
- There is no support for data records inside a fifo
So I decided to extend the kfifo in a more generic way without blowing up
the API to much. The new API has the following benefits:
- Generic usage: For kernel internal use and/or device driver.
- Provide an API for the most use case.
- Slim API: The whole API provides 25 functions.
- Linux style habit.
- DECLARE_KFIFO, DEFINE_KFIFO and INIT_KFIFO Macros
- Direct copy_to_user from the fifo and copy_from_user into the fifo.
- The kfifo itself is an in place member of the using data structure, this save an
indirection access and does not waste the kernel allocator.
- Lockless access: if only one reader and one writer is active on the fifo,
which is the common use case, no additional locking is necessary.
- Remove spinlock - give the user the freedom of choice what kind of locking to use if
one is required.
- Ability to handle records. Three type of records are supported:
- Variable length records between 0-255 bytes, with a record size
field of 1 bytes.
- Variable length records between 0-65535 bytes, with a record size
field of 2 bytes.
- Fixed size records, which no record size field.
- Preserve memory resource.
- Performance!
- Easy to use!
This patch:
Since most users want to have the kfifo as part of another object,
reorganize the code to allow including struct kfifo in another data
structure. This requires changing the kfifo_alloc and kfifo_init
prototypes so that we pass an existing kfifo pointer into them. This
patch changes the implementation and all existing users.
[akpm@linux-foundation.org: fix warning]
Signed-off-by: Stefani Seibold <stefani@seibold.net>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Acked-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-12-21 15:37:26 -07:00
|
|
|
kfifo_free(&dccpw.fifo);
|
2006-09-21 20:28:01 -06:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
module_init(dccpprobe_init);
|
|
|
|
|
|
|
|
static __exit void dccpprobe_exit(void)
|
|
|
|
{
|
kfifo: move struct kfifo in place
This is a new generic kernel FIFO implementation.
The current kernel fifo API is not very widely used, because it has to
many constrains. Only 17 files in the current 2.6.31-rc5 used it.
FIFO's are like list's a very basic thing and a kfifo API which handles
the most use case would save a lot of development time and memory
resources.
I think this are the reasons why kfifo is not in use:
- The API is to simple, important functions are missing
- A fifo can be only allocated dynamically
- There is a requirement of a spinlock whether you need it or not
- There is no support for data records inside a fifo
So I decided to extend the kfifo in a more generic way without blowing up
the API to much. The new API has the following benefits:
- Generic usage: For kernel internal use and/or device driver.
- Provide an API for the most use case.
- Slim API: The whole API provides 25 functions.
- Linux style habit.
- DECLARE_KFIFO, DEFINE_KFIFO and INIT_KFIFO Macros
- Direct copy_to_user from the fifo and copy_from_user into the fifo.
- The kfifo itself is an in place member of the using data structure, this save an
indirection access and does not waste the kernel allocator.
- Lockless access: if only one reader and one writer is active on the fifo,
which is the common use case, no additional locking is necessary.
- Remove spinlock - give the user the freedom of choice what kind of locking to use if
one is required.
- Ability to handle records. Three type of records are supported:
- Variable length records between 0-255 bytes, with a record size
field of 1 bytes.
- Variable length records between 0-65535 bytes, with a record size
field of 2 bytes.
- Fixed size records, which no record size field.
- Preserve memory resource.
- Performance!
- Easy to use!
This patch:
Since most users want to have the kfifo as part of another object,
reorganize the code to allow including struct kfifo in another data
structure. This requires changing the kfifo_alloc and kfifo_init
prototypes so that we pass an existing kfifo pointer into them. This
patch changes the implementation and all existing users.
[akpm@linux-foundation.org: fix warning]
Signed-off-by: Stefani Seibold <stefani@seibold.net>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Acked-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-12-21 15:37:26 -07:00
|
|
|
kfifo_free(&dccpw.fifo);
|
2007-09-12 04:01:34 -06:00
|
|
|
proc_net_remove(&init_net, procname);
|
2006-09-21 20:28:01 -06:00
|
|
|
unregister_jprobe(&dccp_send_probe);
|
|
|
|
|
|
|
|
}
|
|
|
|
module_exit(dccpprobe_exit);
|
|
|
|
|
|
|
|
MODULE_PARM_DESC(port, "Port to match (0=all)");
|
|
|
|
module_param(port, int, 0);
|
|
|
|
|
|
|
|
MODULE_PARM_DESC(bufsize, "Log buffer size (default 64k)");
|
|
|
|
module_param(bufsize, int, 0);
|
|
|
|
|
|
|
|
MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>");
|
|
|
|
MODULE_DESCRIPTION("DCCP snooper");
|
|
|
|
MODULE_LICENSE("GPL");
|