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contrib/lib9p/connection.c

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/*
* Copyright 2016 Jakub Klama <jceel@FreeBSD.org>
* All rights reserved
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted providing that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include <sys/queue.h>
#include "lib9p.h"
#include "lib9p_impl.h"
#include "fid.h"
#include "hashtable.h"
#include "log.h"
#include "threadpool.h"
#include "backend/backend.h"
int
l9p_server_init(struct l9p_server **serverp, struct l9p_backend *backend)
{
struct l9p_server *server;
server = l9p_calloc(1, sizeof (*server));
server->ls_max_version = L9P_2000L;
server->ls_backend = backend;
LIST_INIT(&server->ls_conns);
*serverp = server;
return (0);
}
int
l9p_connection_init(struct l9p_server *server, struct l9p_connection **conn)
{
struct l9p_connection *newconn;
assert(server != NULL);
assert(conn != NULL);
newconn = calloc(1, sizeof (*newconn));
if (newconn == NULL)
return (-1);
newconn->lc_server = server;
newconn->lc_msize = L9P_DEFAULT_MSIZE;
if (l9p_threadpool_init(&newconn->lc_tp, L9P_NUMTHREADS)) {
free(newconn);
return (-1);
}
ht_init(&newconn->lc_files, 100);
ht_init(&newconn->lc_requests, 100);
LIST_INSERT_HEAD(&server->ls_conns, newconn, lc_link);
*conn = newconn;
return (0);
}
void
l9p_connection_free(struct l9p_connection *conn)
{
LIST_REMOVE(conn, lc_link);
free(conn);
}
void
l9p_connection_recv(struct l9p_connection *conn, const struct iovec *iov,
const size_t niov, void *aux)
{
struct l9p_request *req;
int error;
req = l9p_calloc(1, sizeof (struct l9p_request));
req->lr_aux = aux;
req->lr_conn = conn;
req->lr_req_msg.lm_mode = L9P_UNPACK;
req->lr_req_msg.lm_niov = niov;
memcpy(req->lr_req_msg.lm_iov, iov, sizeof (struct iovec) * niov);
req->lr_resp_msg.lm_mode = L9P_PACK;
if (l9p_pufcall(&req->lr_req_msg, &req->lr_req, conn->lc_version) != 0) {
L9P_LOG(L9P_WARNING, "cannot unpack received message");
l9p_freefcall(&req->lr_req);
free(req);
return;
}
if (ht_add(&conn->lc_requests, req->lr_req.hdr.tag, req)) {
L9P_LOG(L9P_WARNING, "client reusing outstanding tag %d",
req->lr_req.hdr.tag);
l9p_freefcall(&req->lr_req);
free(req);
return;
}
error = conn->lc_lt.lt_get_response_buffer(req,
req->lr_resp_msg.lm_iov,
&req->lr_resp_msg.lm_niov,
conn->lc_lt.lt_aux);
if (error) {
L9P_LOG(L9P_WARNING, "cannot obtain buffers for response");
ht_remove(&conn->lc_requests, req->lr_req.hdr.tag);
l9p_freefcall(&req->lr_req);
free(req);
return;
}
/*
* NB: it's up to l9p_threadpool_run to decide whether
* to queue the work or to run it immediately and wait
* (it must do the latter for Tflush requests).
*/
l9p_threadpool_run(&conn->lc_tp, req);
}
void
l9p_connection_close(struct l9p_connection *conn)
{
struct ht_iter iter;
struct l9p_fid *fid;
struct l9p_request *req;
L9P_LOG(L9P_DEBUG, "waiting for thread pool to shut down");
l9p_threadpool_shutdown(&conn->lc_tp);
/* Drain pending requests (if any) */
L9P_LOG(L9P_DEBUG, "draining pending requests");
ht_iter(&conn->lc_requests, &iter);
while ((req = ht_next(&iter)) != NULL) {
#ifdef notyet
/* XXX would be good to know if there is anyone listening */
if (anyone listening) {
/* XXX crude - ops like Tclunk should succeed */
req->lr_error = EINTR;
l9p_respond(req, false, false);
} else
#endif
l9p_respond(req, true, false); /* use no-answer path */
ht_remove_at_iter(&iter);
}
/* Close opened files (if any) */
L9P_LOG(L9P_DEBUG, "closing opened files");
ht_iter(&conn->lc_files, &iter);
while ((fid = ht_next(&iter)) != NULL) {
conn->lc_server->ls_backend->freefid(
conn->lc_server->ls_backend->softc, fid);
free(fid);
ht_remove_at_iter(&iter);
}
ht_destroy(&conn->lc_requests);
ht_destroy(&conn->lc_files);
}
struct l9p_fid *
l9p_connection_alloc_fid(struct l9p_connection *conn, uint32_t fid)
{
struct l9p_fid *file;
file = l9p_calloc(1, sizeof (struct l9p_fid));
file->lo_fid = fid;
/*
* Note that the new fid is not marked valid yet.
* The insert here will fail if the fid number is
* in use, otherwise we have an invalid fid in the
* table (as desired).
*/
if (ht_add(&conn->lc_files, fid, file) != 0) {
free(file);
return (NULL);
}
return (file);
}
void
l9p_connection_remove_fid(struct l9p_connection *conn, struct l9p_fid *fid)
{
struct l9p_backend *be;
/* fid should be marked invalid by this point */
assert(!l9p_fid_isvalid(fid));
be = conn->lc_server->ls_backend;
be->freefid(be->softc, fid);
ht_remove(&conn->lc_files, fid->lo_fid);
free(fid);
}