#include "common/errno.h"
#include "common/module.h"
#include "common/safe_io.h"
+#include "common/TextTable.h"
#include "common/ceph_argparse.h"
#include "common/Preforker.h"
+#include "common/version.h"
#include "global/global_init.h"
#include "global/signal_handler.h"
#undef dout_prefix
#define dout_prefix *_dout << "rbd-nbd: "
+struct Config {
+ int nbds_max = 0;
+ int max_part = 255;
+
+ bool exclusive = false;
+ bool readonly = false;
+ bool set_max_part = false;
+
+ std::string poolname;
+ std::string imgname;
+ std::string snapname;
+ std::string devpath;
+};
+
static void usage()
{
std::cout << "Usage: rbd-nbd [options] map <image-or-snap-spec> Map an image to nbd device\n"
generic_server_usage();
}
-static std::string devpath, poolname("rbd"), imgname, snapname;
-static bool readonly = false;
-static int nbds_max = 0;
-static int max_part = 255;
-static bool set_max_part = false;
-static bool exclusive = false;
static int nbd = -1;
+static enum {
+ None,
+ Connect,
+ Disconnect,
+ List
+} cmd = None;
+
#define RBD_NBD_BLKSIZE 512UL
+#define HELP_INFO 1
+#define VERSION_INFO 2
+
#ifdef CEPH_BIG_ENDIAN
#define ntohll(a) (a)
#elif defined(CEPH_LITTLE_ENDIAN)
#endif
#define htonll(a) ntohll(a)
+static int parse_args(vector<const char*>& args, std::ostream *err_msg, Config *cfg);
+
static void handle_signal(int signum)
{
assert(signum == SIGINT || signum == SIGTERM);
}
};
-static int open_device(const char* path, bool try_load_module = false)
+static int open_device(const char* path, Config *cfg = nullptr, bool try_load_module = false)
{
int nbd = open(path, O_RDWR);
bool loaded_module = false;
if (nbd < 0 && try_load_module && access("/sys/module/nbd", F_OK) != 0) {
ostringstream param;
int r;
- if (nbds_max) {
- param << "nbds_max=" << nbds_max;
+ if (cfg->nbds_max) {
+ param << "nbds_max=" << cfg->nbds_max;
}
- if (max_part) {
- param << " max_part=" << max_part;
+ if (cfg->max_part) {
+ param << " max_part=" << cfg->max_part;
}
r = module_load("nbd", param.str().c_str());
if (r < 0) {
nbd = open(path, O_RDWR);
}
- if ((nbds_max || set_max_part) &&
- try_load_module && !loaded_module) {
+ if (try_load_module && !loaded_module &&
+ (cfg->nbds_max || cfg->set_max_part)) {
cerr << "rbd-nbd: ignoring kernel module parameter options: nbd module already loaded"
<< std::endl;
}
return 0;
}
-static int do_map(int argc, const char *argv[])
+static int do_map(int argc, const char *argv[], Config *cfg)
{
int r;
goto close_ret;
}
- if (devpath.empty()) {
+ if (cfg->devpath.empty()) {
char dev[64];
bool try_load_module = true;
while (true) {
snprintf(dev, sizeof(dev), "/dev/nbd%d", index);
- nbd = open_device(dev, try_load_module);
+ nbd = open_device(dev, cfg, try_load_module);
try_load_module = false;
if (nbd < 0) {
r = nbd;
continue;
}
- devpath = dev;
+ cfg->devpath = dev;
break;
}
} else {
- r = sscanf(devpath.c_str(), "/dev/nbd%d", &index);
+ r = sscanf(cfg->devpath.c_str(), "/dev/nbd%d", &index);
if (r < 0) {
- cerr << "rbd-nbd: invalid device path: " << devpath
+ cerr << "rbd-nbd: invalid device path: " << cfg->devpath
<< " (expected /dev/nbd{num})" << std::endl;
goto close_fd;
}
- nbd = open_device(devpath.c_str(), true);
+ nbd = open_device(cfg->devpath.c_str(), cfg, true);
if (nbd < 0) {
r = nbd;
- cerr << "rbd-nbd: failed to open device: " << devpath << std::endl;
+ cerr << "rbd-nbd: failed to open device: " << cfg->devpath << std::endl;
goto close_fd;
}
r = ioctl(nbd, NBD_SET_SOCK, fd[0]);
if (r < 0) {
r = -errno;
- cerr << "rbd-nbd: the device " << devpath << " is busy" << std::endl;
+ cerr << "rbd-nbd: the device " << cfg->devpath << " is busy" << std::endl;
close(nbd);
goto close_fd;
}
}
flags = NBD_FLAG_SEND_FLUSH | NBD_FLAG_SEND_TRIM | NBD_FLAG_HAS_FLAGS;
- if (!snapname.empty() || readonly) {
+ if (!cfg->snapname.empty() || cfg->readonly) {
flags |= NBD_FLAG_READ_ONLY;
read_only = 1;
}
if (r < 0)
goto close_nbd;
- r = rados.ioctx_create(poolname.c_str(), io_ctx);
+ r = rados.ioctx_create(cfg->poolname.c_str(), io_ctx);
if (r < 0)
goto close_nbd;
- r = rbd.open(io_ctx, image, imgname.c_str());
+ r = rbd.open(io_ctx, image, cfg->imgname.c_str());
if (r < 0)
goto close_nbd;
- if (exclusive) {
+ if (cfg->exclusive) {
r = image.lock_acquire(RBD_LOCK_MODE_EXCLUSIVE);
if (r < 0) {
cerr << "rbd-nbd: failed to acquire exclusive lock: " << cpp_strerror(r)
}
}
- if (!snapname.empty()) {
- r = image.snap_set(snapname.c_str());
+ if (!cfg->snapname.empty()) {
+ r = image.snap_set(cfg->snapname.c_str());
if (r < 0)
goto close_nbd;
}
if (r < 0)
goto close_nbd;
- cout << devpath << std::endl;
+ cout << cfg->devpath << std::endl;
if (g_conf->daemonize) {
forker.daemonize();
return r;
}
-static int do_unmap()
+static int do_unmap(const std::string &devpath)
{
+ int r = 0;
+
int nbd = open_device(devpath.c_str());
if (nbd < 0) {
cerr << "rbd-nbd: failed to open device: " << devpath << std::endl;
return nbd;
}
- if (ioctl(nbd, NBD_DISCONNECT) < 0) {
- cerr << "rbd-nbd: the device is not used" << std::endl;
+ r = ioctl(nbd, NBD_DISCONNECT);
+ if (r < 0) {
+ cerr << "rbd-nbd: the device is not used" << std::endl;
}
close(nbd);
- return 0;
+ return r;
}
-static int parse_imgpath(const std::string &imgpath)
+static int parse_imgpath(const std::string &imgpath, Config *cfg)
{
boost::regex pattern("^(?:([^/@]+)/)?([^/@]+)(?:@([^/@]+))?$");
boost::smatch match;
return -EINVAL;
}
- if (match[1].matched)
- poolname = match[1];
+ if (match[1].matched) {
+ cfg->poolname = match[1];
+ }
- imgname = match[2];
+ cfg->imgname = match[2];
if (match[3].matched)
- snapname = match[3];
+ cfg->snapname = match[3];
return 0;
}
-static int do_list_mapped_devices()
+static int get_mapped_info(int pid, Config *cfg)
{
- char path[64];
- int m = 0;
- int fd[2];
+ int r;
+ std::string path = "/proc/" + stringify(pid) + "/cmdline";
+ std::ifstream ifs;
+ std::string cmdline;
+ std::vector<const char*> args;
- if (socketpair(AF_UNIX, SOCK_STREAM, 0, fd) == -1) {
- int r = -errno;
- cerr << "rbd-nbd: socketpair failed: " << cpp_strerror(-r) << std::endl;
- return r;
+ ifs.open(path.c_str(), std::ifstream::in);
+ assert (ifs.is_open());
+ ifs >> cmdline;
+
+ for (unsigned i = 0; i < cmdline.size(); i++) {
+ const char *arg = &cmdline[i];
+ if (i == 0) {
+ if (strcmp(basename(arg) , "rbd-nbd") != 0) {
+ return -EINVAL;
+ }
+ } else {
+ args.push_back(arg);
+ }
+
+ while (cmdline[i] != '\0') {
+ i++;
+ }
}
+
+ std::ostringstream err_msg;
+ r = parse_args(args, &err_msg, cfg);
+ return r;
+}
- while (true) {
- snprintf(path, sizeof(path), "/dev/nbd%d", m);
- int nbd = open_device(path);
- if (nbd < 0)
- break;
- if (ioctl(nbd, NBD_SET_SOCK, fd[0]) != 0)
- cout << path << std::endl;
- else
- ioctl(nbd, NBD_CLEAR_SOCK);
- close(nbd);
- m++;
+static int get_map_pid(const std::string& pid_path)
+{
+ int pid = 0;
+ std::ifstream ifs;
+ ifs.open(pid_path.c_str(), std::ifstream::in);
+ if (!ifs.is_open()) {
+ return 0;
}
-
- close(fd[0]);
- close(fd[1]);
-
- return 0;
+ ifs >> pid;
+ return pid;
}
-static int rbd_nbd(int argc, const char *argv[])
+static int do_list_mapped_devices()
{
int r;
- enum {
- None,
- Connect,
- Disconnect,
- List
- } cmd = None;
+ bool should_print = false;
+ int index = 0;
+ int pid = 0;
- vector<const char*> args;
+ std::string default_pool_name;
- argv_to_vec(argc, argv, args);
- md_config_t().parse_argv(args);
+ TextTable tbl;
+ tbl.define_column("pid", TextTable::LEFT, TextTable::LEFT);
+ tbl.define_column("pool", TextTable::LEFT, TextTable::LEFT);
+ tbl.define_column("image", TextTable::LEFT, TextTable::LEFT);
+ tbl.define_column("snap", TextTable::LEFT, TextTable::LEFT);
+ tbl.define_column("device", TextTable::LEFT, TextTable::LEFT);
+
+ while (true) {
+ std::string nbd_path = "/sys/block/nbd" + stringify(index);
+ if(access(nbd_path.c_str(), F_OK) != 0) {
+ break;
+ }
+ std::string pid_path = nbd_path + "/pid";
+ pid = get_map_pid(pid_path);
+
+ if(pid > 0) {
+ Config cfg;
+ r = get_mapped_info(pid, &cfg);
+ if (r < 0) {
+ index++;
+ continue;
+ }
+ should_print = true;
+ if (cfg.snapname.empty()) {
+ cfg.snapname = "-";
+ }
+ tbl << pid << cfg.poolname << cfg.imgname << cfg.snapname
+ << "/dev/nbd" + stringify(index) << TextTable::endrow;
+ }
+
+ index++;
+ }
+
+ if (should_print) {
+ cout << tbl;
+ }
+ return 0;
+}
+
+static int parse_args(vector<const char*>& args, std::ostream *err_msg, Config *cfg)
+{
std::vector<const char*>::iterator i;
std::ostringstream err;
+ md_config_t config;
+ config.parse_config_files(nullptr, nullptr, 0);
+ config.parse_env();
+ config.parse_argv(args);
+ cfg->poolname = config.rbd_default_pool;
+
for (i = args.begin(); i != args.end(); ) {
if (ceph_argparse_flag(args, i, "-h", "--help", (char*)NULL)) {
- usage();
- return 0;
- } else if (ceph_argparse_witharg(args, i, &devpath, "--device", (char *)NULL)) {
- } else if (ceph_argparse_witharg(args, i, &nbds_max, err, "--nbds_max", (char *)NULL)) {
+ return HELP_INFO;
+ } else if (ceph_argparse_flag(args, i, "-v", "--version", (char*)NULL)) {
+ return VERSION_INFO;
+ } else if (ceph_argparse_witharg(args, i, &cfg->devpath, "--device", (char *)NULL)) {
+ } else if (ceph_argparse_witharg(args, i, &cfg->nbds_max, err, "--nbds_max", (char *)NULL)) {
if (!err.str().empty()) {
- cerr << err.str() << std::endl;
- return EXIT_FAILURE;
+ *err_msg << "rbd-nbd: " << err.str();
+ return -EINVAL;
}
- if (nbds_max < 0) {
- cerr << "rbd-nbd: Invalid argument for nbds_max!" << std::endl;
- return EXIT_FAILURE;
+ if (cfg->nbds_max < 0) {
+ *err_msg << "rbd-nbd: Invalid argument for nbds_max!";
+ return -EINVAL;
}
- } else if (ceph_argparse_witharg(args, i, &max_part, err, "--max_part", (char *)NULL)) {
+ } else if (ceph_argparse_witharg(args, i, &cfg->max_part, err, "--max_part", (char *)NULL)) {
if (!err.str().empty()) {
- cerr << err.str() << std::endl;
- return EXIT_FAILURE;
+ *err_msg << "rbd-nbd: " << err.str();
+ return -EINVAL;
}
- if ((max_part < 0) || (max_part > 255)) {
- cerr << "rbd-nbd: Invalid argument for max_part(0~255)!" << std::endl;
- return EXIT_FAILURE;
+ if ((cfg->max_part < 0) || (cfg->max_part > 255)) {
+ *err_msg << "rbd-nbd: Invalid argument for max_part(0~255)!";
+ return -EINVAL;
}
- set_max_part = true;
+ cfg->set_max_part = true;
} else if (ceph_argparse_flag(args, i, "--read-only", (char *)NULL)) {
- readonly = true;
+ cfg->readonly = true;
} else if (ceph_argparse_flag(args, i, "--exclusive", (char *)NULL)) {
- exclusive = true;
+ cfg->exclusive = true;
} else {
++i;
}
} else if (strcmp(*args.begin(), "list-mapped") == 0) {
cmd = List;
} else {
- cerr << "rbd-nbd: unknown command: " << *args.begin() << std::endl;
- return EXIT_FAILURE;
+ *err_msg << "rbd-nbd: unknown command: " << *args.begin();
+ return -EINVAL;
}
args.erase(args.begin());
}
if (cmd == None) {
- cerr << "rbd-nbd: must specify command" << std::endl;
- return EXIT_FAILURE;
+ *err_msg << "rbd-nbd: must specify command";
+ return -EINVAL;
}
switch (cmd) {
case Connect:
if (args.begin() == args.end()) {
- cerr << "rbd-nbd: must specify image-or-snap-spec" << std::endl;
- return EXIT_FAILURE;
+ *err_msg << "rbd-nbd: must specify image-or-snap-spec";
+ return -EINVAL;
}
- if (parse_imgpath(string(*args.begin())) < 0)
- return EXIT_FAILURE;
+ if (parse_imgpath(string(*args.begin()), cfg) < 0)
+ return -EINVAL;
args.erase(args.begin());
break;
case Disconnect:
if (args.begin() == args.end()) {
- cerr << "rbd-nbd: must specify nbd device path" << std::endl;
- return EXIT_FAILURE;
+ *err_msg << "rbd-nbd: must specify nbd device path";
+ return -EINVAL;
}
- devpath = *args.begin();
+ cfg->devpath = *args.begin();
args.erase(args.begin());
break;
default:
}
if (args.begin() != args.end()) {
- cerr << "rbd-nbd: unknown args: " << *args.begin() << std::endl;
- return EXIT_FAILURE;
+ *err_msg << "rbd-nbd: unknown args: " << *args.begin();
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int rbd_nbd(int argc, const char *argv[])
+{
+ int r;
+ Config cfg;
+ vector<const char*> args;
+ argv_to_vec(argc, argv, args);
+
+ std::ostringstream err_msg;
+ r = parse_args(args, &err_msg, &cfg);
+ if (r == HELP_INFO) {
+ usage();
+ return 0;
+ } else if (r == VERSION_INFO) {
+ std::cout << pretty_version_to_str() << std::endl;
+ return 0;
+ }
+ else if (r < 0) {
+ cerr << err_msg.str() << std::endl;
+ return r;
}
switch (cmd) {
case Connect:
- if (imgname.empty()) {
+ if (cfg.imgname.empty()) {
cerr << "rbd-nbd: image name was not specified" << std::endl;
- return EXIT_FAILURE;
+ return -EINVAL;
}
- r = do_map(argc, argv);
+ r = do_map(argc, argv, &cfg);
if (r < 0)
- return EXIT_FAILURE;
+ return -EINVAL;
break;
case Disconnect:
- r = do_unmap();
+ r = do_unmap(cfg.devpath);
if (r < 0)
- return EXIT_FAILURE;
+ return -EINVAL;
break;
case List:
r = do_list_mapped_devices();
if (r < 0)
- return EXIT_FAILURE;
+ return -EINVAL;
break;
default:
usage();
- return EXIT_FAILURE;
+ return -EINVAL;
}
return 0;
int main(int argc, const char *argv[])
{
- return rbd_nbd(argc, argv);
+ int r = rbd_nbd(argc, argv);
+ if (r < 0) {
+ return EXIT_FAILURE;
+ }
+ return 0;
}
projects / ceph.git / blobdiff