mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-28 20:02:17 +00:00
![Tejun Heo](/assets/img/avatar_default.png)
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>
310 lines
7.5 KiB
C
310 lines
7.5 KiB
C
/* AF_RXRPC local endpoint management
|
|
*
|
|
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/net.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/slab.h>
|
|
#include <net/sock.h>
|
|
#include <net/af_rxrpc.h>
|
|
#include "ar-internal.h"
|
|
|
|
static LIST_HEAD(rxrpc_locals);
|
|
DEFINE_RWLOCK(rxrpc_local_lock);
|
|
static DECLARE_RWSEM(rxrpc_local_sem);
|
|
static DECLARE_WAIT_QUEUE_HEAD(rxrpc_local_wq);
|
|
|
|
static void rxrpc_destroy_local(struct work_struct *work);
|
|
|
|
/*
|
|
* allocate a new local
|
|
*/
|
|
static
|
|
struct rxrpc_local *rxrpc_alloc_local(struct sockaddr_rxrpc *srx)
|
|
{
|
|
struct rxrpc_local *local;
|
|
|
|
local = kzalloc(sizeof(struct rxrpc_local), GFP_KERNEL);
|
|
if (local) {
|
|
INIT_WORK(&local->destroyer, &rxrpc_destroy_local);
|
|
INIT_WORK(&local->acceptor, &rxrpc_accept_incoming_calls);
|
|
INIT_WORK(&local->rejecter, &rxrpc_reject_packets);
|
|
INIT_LIST_HEAD(&local->services);
|
|
INIT_LIST_HEAD(&local->link);
|
|
init_rwsem(&local->defrag_sem);
|
|
skb_queue_head_init(&local->accept_queue);
|
|
skb_queue_head_init(&local->reject_queue);
|
|
spin_lock_init(&local->lock);
|
|
rwlock_init(&local->services_lock);
|
|
atomic_set(&local->usage, 1);
|
|
local->debug_id = atomic_inc_return(&rxrpc_debug_id);
|
|
memcpy(&local->srx, srx, sizeof(*srx));
|
|
}
|
|
|
|
_leave(" = %p", local);
|
|
return local;
|
|
}
|
|
|
|
/*
|
|
* create the local socket
|
|
* - must be called with rxrpc_local_sem writelocked
|
|
*/
|
|
static int rxrpc_create_local(struct rxrpc_local *local)
|
|
{
|
|
struct sock *sock;
|
|
int ret, opt;
|
|
|
|
_enter("%p{%d}", local, local->srx.transport_type);
|
|
|
|
/* create a socket to represent the local endpoint */
|
|
ret = sock_create_kern(PF_INET, local->srx.transport_type, IPPROTO_UDP,
|
|
&local->socket);
|
|
if (ret < 0) {
|
|
_leave(" = %d [socket]", ret);
|
|
return ret;
|
|
}
|
|
|
|
/* if a local address was supplied then bind it */
|
|
if (local->srx.transport_len > sizeof(sa_family_t)) {
|
|
_debug("bind");
|
|
ret = kernel_bind(local->socket,
|
|
(struct sockaddr *) &local->srx.transport,
|
|
local->srx.transport_len);
|
|
if (ret < 0) {
|
|
_debug("bind failed");
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
/* we want to receive ICMP errors */
|
|
opt = 1;
|
|
ret = kernel_setsockopt(local->socket, SOL_IP, IP_RECVERR,
|
|
(char *) &opt, sizeof(opt));
|
|
if (ret < 0) {
|
|
_debug("setsockopt failed");
|
|
goto error;
|
|
}
|
|
|
|
/* we want to set the don't fragment bit */
|
|
opt = IP_PMTUDISC_DO;
|
|
ret = kernel_setsockopt(local->socket, SOL_IP, IP_MTU_DISCOVER,
|
|
(char *) &opt, sizeof(opt));
|
|
if (ret < 0) {
|
|
_debug("setsockopt failed");
|
|
goto error;
|
|
}
|
|
|
|
write_lock_bh(&rxrpc_local_lock);
|
|
list_add(&local->link, &rxrpc_locals);
|
|
write_unlock_bh(&rxrpc_local_lock);
|
|
|
|
/* set the socket up */
|
|
sock = local->socket->sk;
|
|
sock->sk_user_data = local;
|
|
sock->sk_data_ready = rxrpc_data_ready;
|
|
sock->sk_error_report = rxrpc_UDP_error_report;
|
|
_leave(" = 0");
|
|
return 0;
|
|
|
|
error:
|
|
kernel_sock_shutdown(local->socket, SHUT_RDWR);
|
|
local->socket->sk->sk_user_data = NULL;
|
|
sock_release(local->socket);
|
|
local->socket = NULL;
|
|
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* create a new local endpoint using the specified UDP address
|
|
*/
|
|
struct rxrpc_local *rxrpc_lookup_local(struct sockaddr_rxrpc *srx)
|
|
{
|
|
struct rxrpc_local *local;
|
|
int ret;
|
|
|
|
_enter("{%d,%u,%pI4+%hu}",
|
|
srx->transport_type,
|
|
srx->transport.family,
|
|
&srx->transport.sin.sin_addr,
|
|
ntohs(srx->transport.sin.sin_port));
|
|
|
|
down_write(&rxrpc_local_sem);
|
|
|
|
/* see if we have a suitable local local endpoint already */
|
|
read_lock_bh(&rxrpc_local_lock);
|
|
|
|
list_for_each_entry(local, &rxrpc_locals, link) {
|
|
_debug("CMP {%d,%u,%pI4+%hu}",
|
|
local->srx.transport_type,
|
|
local->srx.transport.family,
|
|
&local->srx.transport.sin.sin_addr,
|
|
ntohs(local->srx.transport.sin.sin_port));
|
|
|
|
if (local->srx.transport_type != srx->transport_type ||
|
|
local->srx.transport.family != srx->transport.family)
|
|
continue;
|
|
|
|
switch (srx->transport.family) {
|
|
case AF_INET:
|
|
if (local->srx.transport.sin.sin_port !=
|
|
srx->transport.sin.sin_port)
|
|
continue;
|
|
if (memcmp(&local->srx.transport.sin.sin_addr,
|
|
&srx->transport.sin.sin_addr,
|
|
sizeof(struct in_addr)) != 0)
|
|
continue;
|
|
goto found_local;
|
|
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
read_unlock_bh(&rxrpc_local_lock);
|
|
|
|
/* we didn't find one, so we need to create one */
|
|
local = rxrpc_alloc_local(srx);
|
|
if (!local) {
|
|
up_write(&rxrpc_local_sem);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
ret = rxrpc_create_local(local);
|
|
if (ret < 0) {
|
|
up_write(&rxrpc_local_sem);
|
|
kfree(local);
|
|
_leave(" = %d", ret);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
up_write(&rxrpc_local_sem);
|
|
|
|
_net("LOCAL new %d {%d,%u,%pI4+%hu}",
|
|
local->debug_id,
|
|
local->srx.transport_type,
|
|
local->srx.transport.family,
|
|
&local->srx.transport.sin.sin_addr,
|
|
ntohs(local->srx.transport.sin.sin_port));
|
|
|
|
_leave(" = %p [new]", local);
|
|
return local;
|
|
|
|
found_local:
|
|
rxrpc_get_local(local);
|
|
read_unlock_bh(&rxrpc_local_lock);
|
|
up_write(&rxrpc_local_sem);
|
|
|
|
_net("LOCAL old %d {%d,%u,%pI4+%hu}",
|
|
local->debug_id,
|
|
local->srx.transport_type,
|
|
local->srx.transport.family,
|
|
&local->srx.transport.sin.sin_addr,
|
|
ntohs(local->srx.transport.sin.sin_port));
|
|
|
|
_leave(" = %p [reuse]", local);
|
|
return local;
|
|
}
|
|
|
|
/*
|
|
* release a local endpoint
|
|
*/
|
|
void rxrpc_put_local(struct rxrpc_local *local)
|
|
{
|
|
_enter("%p{u=%d}", local, atomic_read(&local->usage));
|
|
|
|
ASSERTCMP(atomic_read(&local->usage), >, 0);
|
|
|
|
/* to prevent a race, the decrement and the dequeue must be effectively
|
|
* atomic */
|
|
write_lock_bh(&rxrpc_local_lock);
|
|
if (unlikely(atomic_dec_and_test(&local->usage))) {
|
|
_debug("destroy local");
|
|
rxrpc_queue_work(&local->destroyer);
|
|
}
|
|
write_unlock_bh(&rxrpc_local_lock);
|
|
_leave("");
|
|
}
|
|
|
|
/*
|
|
* destroy a local endpoint
|
|
*/
|
|
static void rxrpc_destroy_local(struct work_struct *work)
|
|
{
|
|
struct rxrpc_local *local =
|
|
container_of(work, struct rxrpc_local, destroyer);
|
|
|
|
_enter("%p{%d}", local, atomic_read(&local->usage));
|
|
|
|
down_write(&rxrpc_local_sem);
|
|
|
|
write_lock_bh(&rxrpc_local_lock);
|
|
if (atomic_read(&local->usage) > 0) {
|
|
write_unlock_bh(&rxrpc_local_lock);
|
|
up_read(&rxrpc_local_sem);
|
|
_leave(" [resurrected]");
|
|
return;
|
|
}
|
|
|
|
list_del(&local->link);
|
|
local->socket->sk->sk_user_data = NULL;
|
|
write_unlock_bh(&rxrpc_local_lock);
|
|
|
|
downgrade_write(&rxrpc_local_sem);
|
|
|
|
ASSERT(list_empty(&local->services));
|
|
ASSERT(!work_pending(&local->acceptor));
|
|
ASSERT(!work_pending(&local->rejecter));
|
|
|
|
/* finish cleaning up the local descriptor */
|
|
rxrpc_purge_queue(&local->accept_queue);
|
|
rxrpc_purge_queue(&local->reject_queue);
|
|
kernel_sock_shutdown(local->socket, SHUT_RDWR);
|
|
sock_release(local->socket);
|
|
|
|
up_read(&rxrpc_local_sem);
|
|
|
|
_net("DESTROY LOCAL %d", local->debug_id);
|
|
kfree(local);
|
|
|
|
if (list_empty(&rxrpc_locals))
|
|
wake_up_all(&rxrpc_local_wq);
|
|
|
|
_leave("");
|
|
}
|
|
|
|
/*
|
|
* preemptively destroy all local local endpoint rather than waiting for
|
|
* them to be destroyed
|
|
*/
|
|
void __exit rxrpc_destroy_all_locals(void)
|
|
{
|
|
DECLARE_WAITQUEUE(myself,current);
|
|
|
|
_enter("");
|
|
|
|
/* we simply have to wait for them to go away */
|
|
if (!list_empty(&rxrpc_locals)) {
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
add_wait_queue(&rxrpc_local_wq, &myself);
|
|
|
|
while (!list_empty(&rxrpc_locals)) {
|
|
schedule();
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
}
|
|
|
|
remove_wait_queue(&rxrpc_local_wq, &myself);
|
|
set_current_state(TASK_RUNNING);
|
|
}
|
|
|
|
_leave("");
|
|
}
|