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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); | |||||
} |