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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include <stdlib.h>
#include "common/debug.h"
#include "common/errno.h"
#include "Driver.h"
#include "Request.h"
#define dout_context g_ceph_context
#define dout_subsys ceph_subsys_rbd
#undef dout_prefix
#define dout_prefix *_dout << "rbd::ggate::Driver: " << this \
<< " " << __func__ << ": "
namespace rbd {
namespace ggate {
int Driver::load() {
return ggate_drv_load();
}
int Driver::kill(const std::string &devname) {
int r = ggate_drv_kill(devname.c_str());
return r;
}
int Driver::list(std::map<std::string, DevInfo> *devices) {
size_t size = 1024;
ggate_drv_info *devs = nullptr;
int r;
while (size <= 1024 * 1024) {
devs = static_cast<ggate_drv_info *>(
realloc(static_cast<void *>(devs), size * sizeof(*devs)));
r = ggate_drv_list(devs, &size);
if (r != -ERANGE) {
break;
}
}
if (r < 0) {
goto free;
}
devices->clear();
for (size_t i = 0; i < size; i++) {
auto &dev = devs[i];
(*devices)[dev.id] = {dev.name, dev.info};
}
free:
free(devs);
return r;
}
Driver::Driver(const std::string &devname, size_t sectorsize, size_t mediasize,
bool readonly, const std::string &info)
: m_devname(devname), m_sectorsize(sectorsize), m_mediasize(mediasize),
m_readonly(readonly), m_info(info) {
}
int Driver::init() {
dout(20) << dendl;
char name[PATH_MAX];
size_t namelen;
if (m_devname.empty()) {
name[0] = '\0';
namelen = PATH_MAX;
} else {
namelen = m_devname.size();
if (namelen >= PATH_MAX) {
return -ENAMETOOLONG;
}
strncpy(name, m_devname.c_str(), namelen + 1);
}
int r = ggate_drv_create(name, namelen, m_sectorsize, m_mediasize, m_readonly,
m_info.c_str(), &m_drv);
if (r < 0) {
return r;
}
if (m_devname.empty()) {
m_devname = name;
}
return 0;
}
std::string Driver::get_devname() const {
dout(30) << m_devname << dendl;
return m_devname;
}
void Driver::shut_down() {
dout(20) << dendl;
ggate_drv_destroy(m_drv);
}
int Driver::resize(size_t newsize) {
dout(20) << "newsize=" << newsize << dendl;
int r = ggate_drv_resize(m_drv, newsize);
if (r < 0) {
return r;
}
m_mediasize = newsize;
return 0;
}
int Driver::recv(Request **req) {
dout(20) << dendl;
ggate_drv_req_t req_;
int r = ggate_drv_recv(m_drv, &req_);
if (r < 0) {
return r;
}
*req = new Request(req_);
dout(20) << "req=" << *req << dendl;
if (ggate_drv_req_cmd(req_) == GGATE_DRV_CMD_WRITE) {
bufferptr ptr(buffer::claim_malloc(
ggate_drv_req_length(req_),
static_cast<char *>(ggate_drv_req_release_buf(req_))));
(*req)->bl.push_back(ptr);
}
return 0;
}
int Driver::send(Request *req) {
dout(20) << "req=" << req << dendl;
if (ggate_drv_req_cmd(req->req) == GGATE_DRV_CMD_READ &&
ggate_drv_req_error(req->req) == 0) {
ceph_assert(req->bl.length() == ggate_drv_req_length(req->req));
// TODO: avoid copying?
req->bl.begin().copy(ggate_drv_req_length(req->req),
static_cast<char *>(ggate_drv_req_buf(req->req)));
dout(20) << "copied resulting " << req->bl.length() << " bytes to "
<< ggate_drv_req_buf(req->req) << dendl;
}
int r = ggate_drv_send(m_drv, req->req);
delete req;
return r;
}
} // namespace ggate
} // namespace rbd
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