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![Adnan Ali](/assets/img/avatar_default.png)
This commit fixes coding style issues related to string splite across multiple lines. Signed-off-by: Adnan Ali <adnan.ali@codethink.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
401 lines
10 KiB
C
401 lines
10 KiB
C
/*
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* r2net.c
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*
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* Copyright (c) 2011, Dan Magenheimer, Oracle Corp.
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*
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* Ramster_r2net provides an interface between zcache and r2net.
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*
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* FIXME: support more than two nodes
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*/
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#include <linux/list.h>
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#include "cluster/tcp.h"
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#include "cluster/nodemanager.h"
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#include "tmem.h"
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#include "zcache.h"
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#include "ramster.h"
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#define RAMSTER_TESTING
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#define RMSTR_KEY 0x77347734
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enum {
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RMSTR_TMEM_PUT_EPH = 100,
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RMSTR_TMEM_PUT_PERS,
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RMSTR_TMEM_ASYNC_GET_REQUEST,
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RMSTR_TMEM_ASYNC_GET_AND_FREE_REQUEST,
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RMSTR_TMEM_ASYNC_GET_REPLY,
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RMSTR_TMEM_FLUSH,
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RMSTR_TMEM_FLOBJ,
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RMSTR_TMEM_DESTROY_POOL,
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};
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#define RMSTR_R2NET_MAX_LEN \
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(R2NET_MAX_PAYLOAD_BYTES - sizeof(struct tmem_xhandle))
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#include "cluster/tcp_internal.h"
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static struct r2nm_node *r2net_target_node;
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static int r2net_target_nodenum;
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int r2net_remote_target_node_set(int node_num)
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{
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int ret = -1;
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r2net_target_node = r2nm_get_node_by_num(node_num);
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if (r2net_target_node != NULL) {
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r2net_target_nodenum = node_num;
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r2nm_node_put(r2net_target_node);
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ret = 0;
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}
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return ret;
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}
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/* FIXME following buffer should be per-cpu, protected by preempt_disable */
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static char ramster_async_get_buf[R2NET_MAX_PAYLOAD_BYTES];
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static int ramster_remote_async_get_request_handler(struct r2net_msg *msg,
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u32 len, void *data, void **ret_data)
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{
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char *pdata;
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struct tmem_xhandle xh;
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int found;
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size_t size = RMSTR_R2NET_MAX_LEN;
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u16 msgtype = be16_to_cpu(msg->msg_type);
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bool get_and_free = (msgtype == RMSTR_TMEM_ASYNC_GET_AND_FREE_REQUEST);
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unsigned long flags;
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xh = *(struct tmem_xhandle *)msg->buf;
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if (xh.xh_data_size > RMSTR_R2NET_MAX_LEN)
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BUG();
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pdata = ramster_async_get_buf;
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*(struct tmem_xhandle *)pdata = xh;
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pdata += sizeof(struct tmem_xhandle);
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local_irq_save(flags);
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found = zcache_get(xh.client_id, xh.pool_id, &xh.oid, xh.index,
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pdata, &size, 1, get_and_free ? 1 : -1);
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local_irq_restore(flags);
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if (found < 0) {
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/* a zero size indicates the get failed */
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size = 0;
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}
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if (size > RMSTR_R2NET_MAX_LEN)
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BUG();
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*ret_data = pdata - sizeof(struct tmem_xhandle);
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/* now make caller (r2net_process_message) handle specially */
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r2net_force_data_magic(msg, RMSTR_TMEM_ASYNC_GET_REPLY, RMSTR_KEY);
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return size + sizeof(struct tmem_xhandle);
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}
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static int ramster_remote_async_get_reply_handler(struct r2net_msg *msg,
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u32 len, void *data, void **ret_data)
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{
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char *in = (char *)msg->buf;
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int datalen = len - sizeof(struct r2net_msg);
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int ret = -1;
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struct tmem_xhandle *xh = (struct tmem_xhandle *)in;
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in += sizeof(struct tmem_xhandle);
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datalen -= sizeof(struct tmem_xhandle);
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BUG_ON(datalen < 0 || datalen > PAGE_SIZE);
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ret = zcache_localify(xh->pool_id, &xh->oid, xh->index,
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in, datalen, xh->extra);
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#ifdef RAMSTER_TESTING
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if (ret == -EEXIST)
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pr_err("TESTING ArrgREP, aborted overwrite on racy put\n");
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#endif
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return ret;
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}
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int ramster_remote_put_handler(struct r2net_msg *msg,
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u32 len, void *data, void **ret_data)
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{
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struct tmem_xhandle *xh;
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char *p = (char *)msg->buf;
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int datalen = len - sizeof(struct r2net_msg) -
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sizeof(struct tmem_xhandle);
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u16 msgtype = be16_to_cpu(msg->msg_type);
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bool ephemeral = (msgtype == RMSTR_TMEM_PUT_EPH);
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unsigned long flags;
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int ret;
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xh = (struct tmem_xhandle *)p;
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p += sizeof(struct tmem_xhandle);
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zcache_autocreate_pool(xh->client_id, xh->pool_id, ephemeral);
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local_irq_save(flags);
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ret = zcache_put(xh->client_id, xh->pool_id, &xh->oid, xh->index,
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p, datalen, 1, ephemeral ? 1 : -1);
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local_irq_restore(flags);
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return ret;
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}
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int ramster_remote_flush_handler(struct r2net_msg *msg,
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u32 len, void *data, void **ret_data)
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{
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struct tmem_xhandle *xh;
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char *p = (char *)msg->buf;
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xh = (struct tmem_xhandle *)p;
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p += sizeof(struct tmem_xhandle);
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(void)zcache_flush(xh->client_id, xh->pool_id, &xh->oid, xh->index);
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return 0;
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}
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int ramster_remote_flobj_handler(struct r2net_msg *msg,
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u32 len, void *data, void **ret_data)
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{
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struct tmem_xhandle *xh;
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char *p = (char *)msg->buf;
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xh = (struct tmem_xhandle *)p;
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p += sizeof(struct tmem_xhandle);
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(void)zcache_flush_object(xh->client_id, xh->pool_id, &xh->oid);
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return 0;
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}
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int ramster_remote_async_get(struct tmem_xhandle *xh, bool free, int remotenode,
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size_t expect_size, uint8_t expect_cksum,
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void *extra)
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{
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int ret = -1, status;
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struct r2nm_node *node = NULL;
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struct kvec vec[1];
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size_t veclen = 1;
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u32 msg_type;
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node = r2nm_get_node_by_num(remotenode);
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if (node == NULL)
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goto out;
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xh->client_id = r2nm_this_node(); /* which node is getting */
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xh->xh_data_cksum = expect_cksum;
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xh->xh_data_size = expect_size;
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xh->extra = extra;
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vec[0].iov_len = sizeof(*xh);
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vec[0].iov_base = xh;
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if (free)
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msg_type = RMSTR_TMEM_ASYNC_GET_AND_FREE_REQUEST;
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else
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msg_type = RMSTR_TMEM_ASYNC_GET_REQUEST;
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ret = r2net_send_message_vec(msg_type, RMSTR_KEY,
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vec, veclen, remotenode, &status);
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r2nm_node_put(node);
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if (ret < 0) {
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/* FIXME handle bad message possibilities here? */
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pr_err("UNTESTED ret<0 in ramster_remote_async_get\n");
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}
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ret = status;
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out:
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return ret;
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}
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#ifdef RAMSTER_TESTING
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/* leave me here to see if it catches a weird crash */
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static void ramster_check_irq_counts(void)
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{
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static int last_hardirq_cnt, last_softirq_cnt, last_preempt_cnt;
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int cur_hardirq_cnt, cur_softirq_cnt, cur_preempt_cnt;
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cur_hardirq_cnt = hardirq_count() >> HARDIRQ_SHIFT;
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if (cur_hardirq_cnt > last_hardirq_cnt) {
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last_hardirq_cnt = cur_hardirq_cnt;
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if (!(last_hardirq_cnt&(last_hardirq_cnt-1)))
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pr_err("RAMSTER TESTING RRP hardirq_count=%d\n",
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last_hardirq_cnt);
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}
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cur_softirq_cnt = softirq_count() >> SOFTIRQ_SHIFT;
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if (cur_softirq_cnt > last_softirq_cnt) {
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last_softirq_cnt = cur_softirq_cnt;
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if (!(last_softirq_cnt&(last_softirq_cnt-1)))
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pr_err("RAMSTER TESTING RRP softirq_count=%d\n",
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last_softirq_cnt);
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}
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cur_preempt_cnt = preempt_count() & PREEMPT_MASK;
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if (cur_preempt_cnt > last_preempt_cnt) {
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last_preempt_cnt = cur_preempt_cnt;
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if (!(last_preempt_cnt&(last_preempt_cnt-1)))
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pr_err("RAMSTER TESTING RRP preempt_count=%d\n",
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last_preempt_cnt);
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}
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}
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#endif
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int ramster_remote_put(struct tmem_xhandle *xh, char *data, size_t size,
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bool ephemeral, int *remotenode)
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{
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int nodenum, ret = -1, status;
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struct r2nm_node *node = NULL;
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struct kvec vec[2];
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size_t veclen = 2;
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u32 msg_type;
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#ifdef RAMSTER_TESTING
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struct r2net_node *nn;
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#endif
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BUG_ON(size > RMSTR_R2NET_MAX_LEN);
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xh->client_id = r2nm_this_node(); /* which node is putting */
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vec[0].iov_len = sizeof(*xh);
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vec[0].iov_base = xh;
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vec[1].iov_len = size;
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vec[1].iov_base = data;
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node = r2net_target_node;
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if (!node)
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goto out;
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nodenum = r2net_target_nodenum;
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r2nm_node_get(node);
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#ifdef RAMSTER_TESTING
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nn = r2net_nn_from_num(nodenum);
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WARN_ON_ONCE(nn->nn_persistent_error || !nn->nn_sc_valid);
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#endif
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if (ephemeral)
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msg_type = RMSTR_TMEM_PUT_EPH;
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else
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msg_type = RMSTR_TMEM_PUT_PERS;
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#ifdef RAMSTER_TESTING
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/* leave me here to see if it catches a weird crash */
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ramster_check_irq_counts();
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#endif
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ret = r2net_send_message_vec(msg_type, RMSTR_KEY, vec, veclen,
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nodenum, &status);
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#ifdef RAMSTER_TESTING
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if (ret != 0) {
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static unsigned long cnt;
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cnt++;
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if (!(cnt&(cnt-1)))
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pr_err("ramster_remote_put: message failed, ret=%d, cnt=%lu\n",
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ret, cnt);
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ret = -1;
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}
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#endif
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if (ret < 0)
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ret = -1;
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else {
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ret = status;
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*remotenode = nodenum;
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}
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r2nm_node_put(node);
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out:
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return ret;
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}
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int ramster_remote_flush(struct tmem_xhandle *xh, int remotenode)
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{
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int ret = -1, status;
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struct r2nm_node *node = NULL;
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struct kvec vec[1];
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size_t veclen = 1;
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node = r2nm_get_node_by_num(remotenode);
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BUG_ON(node == NULL);
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xh->client_id = r2nm_this_node(); /* which node is flushing */
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vec[0].iov_len = sizeof(*xh);
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vec[0].iov_base = xh;
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BUG_ON(irqs_disabled());
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BUG_ON(in_softirq());
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ret = r2net_send_message_vec(RMSTR_TMEM_FLUSH, RMSTR_KEY,
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vec, veclen, remotenode, &status);
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r2nm_node_put(node);
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return ret;
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}
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int ramster_remote_flush_object(struct tmem_xhandle *xh, int remotenode)
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{
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int ret = -1, status;
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struct r2nm_node *node = NULL;
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struct kvec vec[1];
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size_t veclen = 1;
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node = r2nm_get_node_by_num(remotenode);
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BUG_ON(node == NULL);
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xh->client_id = r2nm_this_node(); /* which node is flobjing */
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vec[0].iov_len = sizeof(*xh);
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vec[0].iov_base = xh;
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ret = r2net_send_message_vec(RMSTR_TMEM_FLOBJ, RMSTR_KEY,
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vec, veclen, remotenode, &status);
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r2nm_node_put(node);
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return ret;
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}
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/*
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* Handler registration
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*/
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static LIST_HEAD(r2net_unreg_list);
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static void r2net_unregister_handlers(void)
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{
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r2net_unregister_handler_list(&r2net_unreg_list);
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}
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int r2net_register_handlers(void)
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{
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int status;
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status = r2net_register_handler(RMSTR_TMEM_PUT_EPH, RMSTR_KEY,
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RMSTR_R2NET_MAX_LEN,
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ramster_remote_put_handler,
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NULL, NULL, &r2net_unreg_list);
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if (status)
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goto bail;
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status = r2net_register_handler(RMSTR_TMEM_PUT_PERS, RMSTR_KEY,
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RMSTR_R2NET_MAX_LEN,
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ramster_remote_put_handler,
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NULL, NULL, &r2net_unreg_list);
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if (status)
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goto bail;
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status = r2net_register_handler(RMSTR_TMEM_ASYNC_GET_REQUEST, RMSTR_KEY,
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RMSTR_R2NET_MAX_LEN,
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ramster_remote_async_get_request_handler,
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NULL, NULL,
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&r2net_unreg_list);
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if (status)
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goto bail;
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status = r2net_register_handler(RMSTR_TMEM_ASYNC_GET_AND_FREE_REQUEST,
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RMSTR_KEY, RMSTR_R2NET_MAX_LEN,
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ramster_remote_async_get_request_handler,
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NULL, NULL,
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&r2net_unreg_list);
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if (status)
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goto bail;
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status = r2net_register_handler(RMSTR_TMEM_ASYNC_GET_REPLY, RMSTR_KEY,
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RMSTR_R2NET_MAX_LEN,
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ramster_remote_async_get_reply_handler,
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NULL, NULL,
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&r2net_unreg_list);
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if (status)
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goto bail;
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status = r2net_register_handler(RMSTR_TMEM_FLUSH, RMSTR_KEY,
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RMSTR_R2NET_MAX_LEN,
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ramster_remote_flush_handler,
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NULL, NULL,
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&r2net_unreg_list);
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if (status)
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goto bail;
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status = r2net_register_handler(RMSTR_TMEM_FLOBJ, RMSTR_KEY,
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RMSTR_R2NET_MAX_LEN,
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ramster_remote_flobj_handler,
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NULL, NULL,
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&r2net_unreg_list);
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if (status)
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goto bail;
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pr_info("ramster: r2net handlers registered\n");
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bail:
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if (status) {
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r2net_unregister_handlers();
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pr_err("ramster: couldn't register r2net handlers\n");
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}
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return status;
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}
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