Revision 0a4ebed781dbb9ecbfef2374d29da1ab3b1a63f3 authored by Linus Torvalds on 01 December 2011, 22:55:34 UTC, committed by Linus Torvalds on 01 December 2011, 22:55:34 UTC
* 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jlbec/ocfs2: (31 commits) ocfs2: avoid unaligned access to dqc_bitmap ocfs2: Use filemap_write_and_wait() instead of write_inode_now() ocfs2: honor O_(D)SYNC flag in fallocate ocfs2: Add a missing journal credit in ocfs2_link_credits() -v2 ocfs2: send correct UUID to cleancache initialization ocfs2: Commit transactions in error cases -v2 ocfs2: make direntry invalid when deleting it fs/ocfs2/dlm/dlmlock.c: free kmem_cache_zalloc'd data using kmem_cache_free ocfs2: Avoid livelock in ocfs2_readpage() ocfs2: serialize unaligned aio ocfs2: Implement llseek() ocfs2: Fix ocfs2_page_mkwrite() ocfs2: Add comment about orphan scanning ocfs2: Clean up messages in the fs ocfs2/cluster: Cluster up now includes network connections too ocfs2/cluster: Add new function o2net_fill_node_map() ocfs2/cluster: Fix output in file elapsed_time_in_ms ocfs2/dlm: dlmlock_remote() needs to account for remastery ocfs2/dlm: Take inflight reference count for remotely mastered resources too ocfs2/dlm: Cleanup dlm_wait_for_node_death() and dlm_wait_for_node_recovery() ...
qpolicy.c
/*
* net/dccp/qpolicy.c
*
* Policy-based packet dequeueing interface for DCCP.
*
* Copyright (c) 2008 Tomasz Grobelny <tomasz@grobelny.oswiecenia.net>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License v2
* as published by the Free Software Foundation.
*/
#include "dccp.h"
/*
* Simple Dequeueing Policy:
* If tx_qlen is different from 0, enqueue up to tx_qlen elements.
*/
static void qpolicy_simple_push(struct sock *sk, struct sk_buff *skb)
{
skb_queue_tail(&sk->sk_write_queue, skb);
}
static bool qpolicy_simple_full(struct sock *sk)
{
return dccp_sk(sk)->dccps_tx_qlen &&
sk->sk_write_queue.qlen >= dccp_sk(sk)->dccps_tx_qlen;
}
static struct sk_buff *qpolicy_simple_top(struct sock *sk)
{
return skb_peek(&sk->sk_write_queue);
}
/*
* Priority-based Dequeueing Policy:
* If tx_qlen is different from 0 and the queue has reached its upper bound
* of tx_qlen elements, replace older packets lowest-priority-first.
*/
static struct sk_buff *qpolicy_prio_best_skb(struct sock *sk)
{
struct sk_buff *skb, *best = NULL;
skb_queue_walk(&sk->sk_write_queue, skb)
if (best == NULL || skb->priority > best->priority)
best = skb;
return best;
}
static struct sk_buff *qpolicy_prio_worst_skb(struct sock *sk)
{
struct sk_buff *skb, *worst = NULL;
skb_queue_walk(&sk->sk_write_queue, skb)
if (worst == NULL || skb->priority < worst->priority)
worst = skb;
return worst;
}
static bool qpolicy_prio_full(struct sock *sk)
{
if (qpolicy_simple_full(sk))
dccp_qpolicy_drop(sk, qpolicy_prio_worst_skb(sk));
return false;
}
/**
* struct dccp_qpolicy_operations - TX Packet Dequeueing Interface
* @push: add a new @skb to the write queue
* @full: indicates that no more packets will be admitted
* @top: peeks at whatever the queueing policy defines as its `top'
*/
static struct dccp_qpolicy_operations {
void (*push) (struct sock *sk, struct sk_buff *skb);
bool (*full) (struct sock *sk);
struct sk_buff* (*top) (struct sock *sk);
__be32 params;
} qpol_table[DCCPQ_POLICY_MAX] = {
[DCCPQ_POLICY_SIMPLE] = {
.push = qpolicy_simple_push,
.full = qpolicy_simple_full,
.top = qpolicy_simple_top,
.params = 0,
},
[DCCPQ_POLICY_PRIO] = {
.push = qpolicy_simple_push,
.full = qpolicy_prio_full,
.top = qpolicy_prio_best_skb,
.params = DCCP_SCM_PRIORITY,
},
};
/*
* Externally visible interface
*/
void dccp_qpolicy_push(struct sock *sk, struct sk_buff *skb)
{
qpol_table[dccp_sk(sk)->dccps_qpolicy].push(sk, skb);
}
bool dccp_qpolicy_full(struct sock *sk)
{
return qpol_table[dccp_sk(sk)->dccps_qpolicy].full(sk);
}
void dccp_qpolicy_drop(struct sock *sk, struct sk_buff *skb)
{
if (skb != NULL) {
skb_unlink(skb, &sk->sk_write_queue);
kfree_skb(skb);
}
}
struct sk_buff *dccp_qpolicy_top(struct sock *sk)
{
return qpol_table[dccp_sk(sk)->dccps_qpolicy].top(sk);
}
struct sk_buff *dccp_qpolicy_pop(struct sock *sk)
{
struct sk_buff *skb = dccp_qpolicy_top(sk);
if (skb != NULL) {
/* Clear any skb fields that we used internally */
skb->priority = 0;
skb_unlink(skb, &sk->sk_write_queue);
}
return skb;
}
bool dccp_qpolicy_param_ok(struct sock *sk, __be32 param)
{
/* check if exactly one bit is set */
if (!param || (param & (param - 1)))
return false;
return (qpol_table[dccp_sk(sk)->dccps_qpolicy].params & param) == param;
}
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