cregit-Linux how code gets into the kernel

Release 4.11 net/rds/transport.c

Directory: net/rds
/*
 * Copyright (c) 2006 Oracle.  All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/in.h>

#include "rds.h"
#include "loop.h"


static struct rds_transport *transports[RDS_TRANS_COUNT];
static DECLARE_RWSEM(rds_trans_sem);


void rds_trans_register(struct rds_transport *trans) { BUG_ON(strlen(trans->t_name) + 1 > TRANSNAMSIZ); down_write(&rds_trans_sem); if (transports[trans->t_type]) printk(KERN_ERR "RDS Transport type %d already registered\n", trans->t_type); else { transports[trans->t_type] = trans; printk(KERN_INFO "Registered RDS/%s transport\n", trans->t_name); } up_write(&rds_trans_sem); }

Contributors

PersonTokensPropCommitsCommitProp
Andy Grover7698.70%266.67%
Zhu Yanjun11.30%133.33%
Total77100.00%3100.00%

EXPORT_SYMBOL_GPL(rds_trans_register);
void rds_trans_unregister(struct rds_transport *trans) { down_write(&rds_trans_sem); transports[trans->t_type] = NULL; printk(KERN_INFO "Unregistered RDS/%s transport\n", trans->t_name); up_write(&rds_trans_sem); }

Contributors

PersonTokensPropCommitsCommitProp
Andy Grover41100.00%2100.00%
Total41100.00%2100.00%

EXPORT_SYMBOL_GPL(rds_trans_unregister);
void rds_trans_put(struct rds_transport *trans) { if (trans) module_put(trans->t_owner); }

Contributors

PersonTokensPropCommitsCommitProp
Zach Brown21100.00%1100.00%
Total21100.00%1100.00%


struct rds_transport *rds_trans_get_preferred(struct net *net, __be32 addr) { struct rds_transport *ret = NULL; struct rds_transport *trans; unsigned int i; if (IN_LOOPBACK(ntohl(addr))) return &rds_loop_transport; down_read(&rds_trans_sem); for (i = 0; i < RDS_TRANS_COUNT; i++) { trans = transports[i]; if (trans && (trans->laddr_check(net, addr) == 0) && (!trans->t_owner || try_module_get(trans->t_owner))) { ret = trans; break; } } up_read(&rds_trans_sem); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Andy Grover6755.83%240.00%
Sowmini Varadhan3327.50%240.00%
Zach Brown2016.67%120.00%
Total120100.00%5100.00%


struct rds_transport *rds_trans_get(int t_type) { struct rds_transport *ret = NULL; struct rds_transport *trans; unsigned int i; down_read(&rds_trans_sem); for (i = 0; i < RDS_TRANS_COUNT; i++) { trans = transports[i]; if (trans && trans->t_type == t_type && (!trans->t_owner || try_module_get(trans->t_owner))) { ret = trans; break; } } up_read(&rds_trans_sem); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Sowmini Varadhan6872.34%133.33%
Andy Grover1819.15%133.33%
Zach Brown88.51%133.33%
Total94100.00%3100.00%

/* * This returns the number of stats entries in the snapshot and only * copies them using the iter if there is enough space for them. The * caller passes in the global stats so that we can size and copy while * holding the lock. */
unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter, unsigned int avail) { struct rds_transport *trans; unsigned int total = 0; unsigned int part; int i; rds_info_iter_unmap(iter); down_read(&rds_trans_sem); for (i = 0; i < RDS_TRANS_COUNT; i++) { trans = transports[i]; if (!trans || !trans->stats_info_copy) continue; part = trans->stats_info_copy(iter, avail); avail -= min(avail, part); total += part; } up_read(&rds_trans_sem); return total; }

Contributors

PersonTokensPropCommitsCommitProp
Andy Grover110100.00%2100.00%
Total110100.00%2100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Andy Grover35470.10%342.86%
Sowmini Varadhan10120.00%228.57%
Zach Brown499.70%114.29%
Zhu Yanjun10.20%114.29%
Total505100.00%7100.00%
Directory: net/rds
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