Adding upstream version 18.2.2.upstream/18.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

2 files changed, 972 insertions, 0 deletions

diff --git a/src/rbd_fuse/CMakeLists.txt b/src/rbd_fuse/CMakeLists.txt
new file mode 100644
index 000000000..f83f97a3f
--- /dev/null
+++ b/src/rbd_fuse/CMakeLists.txt
@@ -0,0 +1,5 @@
+add_executable(rbd-fuse
+  rbd-fuse.cc)
+target_link_libraries(rbd-fuse
+  ceph-common librbd librados global FUSE::FUSE)
+install(TARGETS rbd-fuse DESTINATION bin)
diff --git a/src/rbd_fuse/rbd-fuse.cc b/src/rbd_fuse/rbd-fuse.cc
new file mode 100644
index 000000000..12e30ceb0
--- /dev/null
+++ b/src/rbd_fuse/rbd-fuse.cc
@@ -0,0 +1,967 @@
+/*
+ * rbd-fuse
+ */
+#include "include/int_types.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <pthread.h>
+#include <string.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <assert.h>
+#include <string>
+#include <mutex>
+#include <limits.h>
+
+#if defined(__FreeBSD__)
+#include <sys/param.h>
+#endif
+
+#include "include/compat.h"
+#include "include/rbd/librbd.h"
+#include "include/ceph_assert.h"
+
+#include "common/ceph_argparse.h"
+#include "common/ceph_context.h"
+#include "include/ceph_fuse.h"
+
+#include "global/global_init.h"
+#include "global/global_context.h"
+
+static int gotrados = 0;
+char *pool_name;
+char *nspace_name;
+char *mount_image_name;
+rados_t cluster;
+rados_ioctx_t ioctx;
+
+std::mutex readdir_lock;
+
+struct rbd_stat {
+	u_char valid;
+	rbd_image_info_t rbd_info;
+};
+
+struct rbd_options {
+	char *pool_name;
+	char *nspace_name;
+	char *image_name;
+};
+
+struct rbd_image {
+	char *image_name;
+	struct rbd_image *next;
+};
+struct rbd_image_data {
+	struct rbd_image *images;
+	rbd_image_spec_t *image_specs;
+	size_t image_spec_count;
+};
+struct rbd_image_data rbd_image_data;
+
+struct rbd_openimage {
+	char *image_name;
+	rbd_image_t image;
+	struct rbd_stat rbd_stat;
+};
+#define MAX_RBD_IMAGES		128
+struct rbd_openimage opentbl[MAX_RBD_IMAGES];
+
+struct rbd_options rbd_options = {(char*) "rbd", (char*) "", NULL};
+
+#define rbdsize(fd)	opentbl[fd].rbd_stat.rbd_info.size
+#define rbdblksize(fd)	opentbl[fd].rbd_stat.rbd_info.obj_size
+#define rbdblkcnt(fd)	opentbl[fd].rbd_stat.rbd_info.num_objs
+
+uint64_t imagesize = 1024ULL * 1024 * 1024;
+uint64_t imageorder = 22ULL;
+uint64_t imagefeatures = 1ULL;
+
+// Minimize calls to rbd_list: marks bracketing of opendir/<ops>/releasedir
+int in_opendir;
+
+/* prototypes */
+int connect_to_cluster(rados_t *pcluster);
+void enumerate_images(struct rbd_image_data *data);
+int open_rbd_image(const char *image_name);
+int find_openrbd(const char *path);
+
+void simple_err(const char *msg, int err);
+
+void
+enumerate_images(struct rbd_image_data *data)
+{
+	struct rbd_image **head = &data->images;
+	struct rbd_image *im, *next;
+	int ret;
+
+	if (*head != NULL) {
+		for (im = *head; im != NULL;) {
+			next = im->next;
+			free(im);
+			im = next;
+		}
+		*head = NULL;
+		rbd_image_spec_list_cleanup(data->image_specs,
+					    data->image_spec_count);
+		free(data->image_specs);
+		data->image_specs = NULL;
+		data->image_spec_count = 0;
+	}
+
+	while (true) {
+		ret = rbd_list2(ioctx, data->image_specs,
+				&data->image_spec_count);
+		if (ret == -ERANGE) {
+			data->image_specs = static_cast<rbd_image_spec_t *>(
+				realloc(data->image_specs,
+					sizeof(rbd_image_spec_t) * data->image_spec_count));
+		} else if (ret < 0) {
+			simple_err("Failed to list images", ret);
+		} else {
+			break;
+		}
+	}
+
+	if (*nspace_name != '\0') {
+	    fprintf(stderr, "pool/namespace %s/%s: ", pool_name, nspace_name);
+	} else {
+	    fprintf(stderr, "pool %s: ", pool_name);
+	}
+	for (size_t idx = 0; idx < data->image_spec_count; ++idx) {
+		if ((mount_image_name == NULL) ||
+		    ((strlen(mount_image_name) > 0) &&
+		    (strcmp(data->image_specs[idx].name, mount_image_name) == 0))) {
+			fprintf(stderr, "%s, ", data->image_specs[idx].name);
+			im = static_cast<rbd_image*>(malloc(sizeof(*im)));
+			im->image_name = data->image_specs[idx].name;
+			im->next = *head;
+			*head = im;
+		}
+	}
+	fprintf(stderr, "\n");
+}
+
+int
+find_openrbd(const char *path)
+{
+	int i;
+
+	/* find in opentbl[] entry if already open */
+	for (i = 0; i < MAX_RBD_IMAGES; i++) {
+		if ((opentbl[i].image_name != NULL) &&
+		    (strcmp(opentbl[i].image_name, path) == 0)) {
+			return i;
+		}
+	}
+	return -1;
+}
+
+int
+open_rbd_image(const char *image_name)
+{
+	struct rbd_image *im;
+	struct rbd_openimage *rbd = NULL;
+	int fd;
+
+	if (image_name == (char *)NULL) 
+		return -1;
+
+	// relies on caller to keep rbd_image_data up to date
+	for (im = rbd_image_data.images; im != NULL; im = im->next) {
+		if (strcmp(im->image_name, image_name) == 0) {
+			break;
+		}
+	}
+	if (im == NULL)
+		return -1;
+
+	/* find in opentbl[] entry if already open */
+	if ((fd = find_openrbd(image_name)) != -1) {
+		rbd = &opentbl[fd];
+	} else {
+		int i;
+		// allocate an opentbl[] and open the image
+		for (i = 0; i < MAX_RBD_IMAGES; i++) {
+			if (opentbl[i].image == NULL) {
+				fd = i;
+				rbd = &opentbl[fd];
+				rbd->image_name = strdup(image_name);
+				break;
+			}
+		}
+		if (i == MAX_RBD_IMAGES || !rbd)
+			return -1;
+		int ret = rbd_open(ioctx, rbd->image_name, &(rbd->image), NULL);
+		if (ret < 0) {
+			simple_err("open_rbd_image: can't open: ", ret);
+			return ret;
+		}
+	}
+	rbd_stat(rbd->image, &(rbd->rbd_stat.rbd_info),
+		 sizeof(rbd_image_info_t));
+	rbd->rbd_stat.valid = 1;
+	return fd;
+}
+
+static void
+iter_images(void *cookie,
+	    void (*iter)(void *cookie, const char *image))
+{
+	struct rbd_image *im;
+
+	readdir_lock.lock();
+
+	for (im = rbd_image_data.images; im != NULL; im = im->next)
+		iter(cookie, im->image_name);
+	readdir_lock.unlock();
+}
+
+static void count_images_cb(void *cookie, const char *image)
+{
+	(*((unsigned int *)cookie))++;
+}
+
+static int count_images(void)
+{
+	unsigned int count = 0;
+
+	readdir_lock.lock();
+	enumerate_images(&rbd_image_data);
+	readdir_lock.unlock();
+
+	iter_images(&count, count_images_cb);
+	return count;
+}
+
+extern "C" {
+
+static int rbdfs_getattr(const char *path, struct stat *stbuf
+#if FUSE_VERSION >= FUSE_MAKE_VERSION(3, 0)
+                         , struct fuse_file_info *fi
+#endif
+                        )
+{
+	int fd;
+	time_t now;
+
+	if (!gotrados)
+		return -ENXIO;
+
+	if (path[0] == 0)
+		return -ENOENT;
+
+	memset(stbuf, 0, sizeof(struct stat));
+
+	if (strcmp(path, "/") == 0) {
+
+		now = time(NULL);
+		stbuf->st_mode = S_IFDIR + 0755;
+		stbuf->st_nlink = 2+count_images();
+		stbuf->st_uid = getuid();
+		stbuf->st_gid = getgid();
+		stbuf->st_size = 1024;
+		stbuf->st_blksize = 1024;
+		stbuf->st_blocks = 1;
+		stbuf->st_atime = now;
+		stbuf->st_mtime = now;
+		stbuf->st_ctime = now;
+
+		return 0;
+	}
+
+	if (!in_opendir) {
+		readdir_lock.lock();
+		enumerate_images(&rbd_image_data);
+		readdir_lock.unlock();
+	}
+	fd = open_rbd_image(path + 1);
+	if (fd < 0)
+		return -ENOENT;
+
+	now = time(NULL);
+	stbuf->st_mode = S_IFREG | 0666;
+	stbuf->st_nlink = 1;
+	stbuf->st_uid = getuid();
+	stbuf->st_gid = getgid();
+	stbuf->st_size = rbdsize(fd);
+	stbuf->st_blksize = rbdblksize(fd);
+	stbuf->st_blocks = rbdblkcnt(fd);
+	stbuf->st_atime = now;
+	stbuf->st_mtime = now;
+	stbuf->st_ctime = now;
+
+	return 0;
+}
+
+
+static int rbdfs_open(const char *path, struct fuse_file_info *fi)
+{
+	int fd;
+
+	if (!gotrados)
+		return -ENXIO;
+
+	if (path[0] == 0)
+		return -ENOENT;
+
+	readdir_lock.lock();
+	enumerate_images(&rbd_image_data);
+	readdir_lock.unlock();
+	fd = open_rbd_image(path + 1);
+	if (fd < 0)
+		return -ENOENT;
+
+	fi->fh = fd;
+	return 0;
+}
+
+static int rbdfs_read(const char *path, char *buf, size_t size,
+			off_t offset, struct fuse_file_info *fi)
+{
+	size_t numread;
+	struct rbd_openimage *rbd;
+
+	if (!gotrados)
+		return -ENXIO;
+
+	rbd = &opentbl[fi->fh];
+	numread = 0;
+	while (size > 0) {
+		ssize_t ret;
+
+		ret = rbd_read(rbd->image, offset, size, buf);
+
+		if (ret <= 0)
+			break;
+		buf += ret;
+		size -= ret;
+		offset += ret;
+		numread += ret;
+	}
+
+	return numread;
+}
+
+static int rbdfs_write(const char *path, const char *buf, size_t size,
+			 off_t offset, struct fuse_file_info *fi)
+{
+	size_t numwritten;
+	struct rbd_openimage *rbd;
+
+	if (!gotrados)
+		return -ENXIO;
+
+	rbd = &opentbl[fi->fh];
+	numwritten = 0;
+	while (size > 0) {
+		ssize_t ret;
+
+		if ((size_t)(offset + size) > rbdsize(fi->fh)) {
+			int r;
+			fprintf(stderr, "rbdfs_write resizing %s to 0x%" PRIxMAX "\n",
+				path, offset+size);
+			r = rbd_resize(rbd->image, offset+size);
+			if (r < 0)
+				return r;
+
+			r = rbd_stat(rbd->image, &(rbd->rbd_stat.rbd_info),
+				 sizeof(rbd_image_info_t));
+			if (r < 0)
+				return r;
+		}
+		ret = rbd_write(rbd->image, offset, size, buf);
+
+		if (ret < 0)
+			break;
+		buf += ret;
+		size -= ret;
+		offset += ret;
+		numwritten += ret;
+	}
+
+	return numwritten;
+}
+
+static void rbdfs_statfs_image_cb(void *num, const char *image)
+{
+	int	fd;
+
+	((uint64_t *)num)[0]++;
+
+	fd = open_rbd_image(image);
+	if (fd >= 0)
+		((uint64_t *)num)[1] += rbdsize(fd);
+}
+
+static int rbdfs_statfs(const char *path, struct statvfs *buf)
+{
+	uint64_t num[2];
+
+	if (!gotrados)
+		return -ENXIO;
+
+	num[0] = 1;
+	num[1] = 0;
+	readdir_lock.lock();
+	enumerate_images(&rbd_image_data);
+	readdir_lock.unlock();
+	iter_images(num, rbdfs_statfs_image_cb);
+
+#define	RBDFS_BSIZE	4096
+	buf->f_bsize = RBDFS_BSIZE;
+	buf->f_frsize = RBDFS_BSIZE;
+	buf->f_blocks = num[1] / RBDFS_BSIZE;
+	buf->f_bfree = 0;
+	buf->f_bavail = 0;
+	buf->f_files = num[0];
+	buf->f_ffree = 0;
+	buf->f_favail = 0;
+	buf->f_fsid = 0;
+	buf->f_flag = 0;
+	buf->f_namemax = PATH_MAX;
+
+	return 0;
+}
+
+static int rbdfs_fsync(const char *path, int datasync,
+			 struct fuse_file_info *fi)
+{
+	if (!gotrados)
+		return -ENXIO;
+	rbd_flush(opentbl[fi->fh].image);
+	return 0;
+}
+
+static int rbdfs_opendir(const char *path, struct fuse_file_info *fi)
+{
+	// only one directory, so global "in_opendir" flag should be fine
+	readdir_lock.lock();
+	in_opendir++;
+	enumerate_images(&rbd_image_data);
+	readdir_lock.unlock();
+	return 0;
+}
+
+struct rbdfs_readdir_info {
+	void *buf;
+	fuse_fill_dir_t filler;
+};
+
+static void rbdfs_readdir_cb(void *_info, const char *name)
+{
+	struct rbdfs_readdir_info *info = (struct rbdfs_readdir_info*) _info;
+
+        filler_compat(info->filler, info->buf, name, NULL, 0);
+}
+
+static int rbdfs_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
+			 off_t offset, struct fuse_file_info *fi
+#if FUSE_VERSION >= FUSE_MAKE_VERSION(3, 0)
+                         , enum fuse_readdir_flags
+#endif
+                         )
+{
+	struct rbdfs_readdir_info info = { buf, filler };
+
+	if (!gotrados)
+		return -ENXIO;
+	if (!in_opendir)
+		fprintf(stderr, "in readdir, but not inside opendir?\n");
+
+	if (strcmp(path, "/") != 0)
+		return -ENOENT;
+
+	filler_compat(filler, buf, ".", NULL, 0);
+	filler_compat(filler, buf, "..", NULL, 0);
+	iter_images(&info, rbdfs_readdir_cb);
+
+	return 0;
+}
+static int rbdfs_releasedir(const char *path, struct fuse_file_info *fi)
+{
+	// see opendir comments
+	readdir_lock.lock();
+	in_opendir--;
+	readdir_lock.unlock();
+	return 0;
+}
+
+void *
+rbdfs_init(struct fuse_conn_info *conn
+#if FUSE_VERSION >= FUSE_MAKE_VERSION(3, 0)
+           , struct fuse_config *cfg
+#endif
+          )
+{
+	int ret;
+
+	// init cannot fail, so if we fail here, gotrados remains at 0,
+	// causing other operations to fail immediately with ENXIO
+
+	ret = connect_to_cluster(&cluster);
+	if (ret < 0)
+		exit(90);
+
+	pool_name = rbd_options.pool_name;
+	nspace_name = rbd_options.nspace_name;
+	mount_image_name = rbd_options.image_name;
+	ret = rados_ioctx_create(cluster, pool_name, &ioctx);
+	if (ret < 0)
+		exit(91);
+#if FUSE_VERSION >= FUSE_MAKE_VERSION(2, 8) && FUSE_VERSION < FUSE_MAKE_VERSION(3, 0)
+	conn->want |= FUSE_CAP_BIG_WRITES;
+#endif
+	rados_ioctx_set_namespace(ioctx, nspace_name);
+	gotrados = 1;
+
+	// init's return value shows up in fuse_context.private_data,
+	// also to void (*destroy)(void *); useful?
+	return NULL;
+}
+
+void
+rbdfs_destroy(void *unused)
+{
+	if (!gotrados)
+		return;
+	for (int i = 0; i < MAX_RBD_IMAGES; ++i) {
+		if (opentbl[i].image) {
+			rbd_close(opentbl[i].image);
+			opentbl[i].image = NULL;
+		}
+	}
+	rados_ioctx_destroy(ioctx);
+	rados_shutdown(cluster);
+}
+
+int
+rbdfs_checkname(const char *checkname)
+{
+    const char *extra[] = {"@", "/"};
+    std::string strCheckName(checkname);
+    
+    if (strCheckName.empty())
+        return -EINVAL;
+
+    unsigned int sz = sizeof(extra) / sizeof(const char*);
+    for (unsigned int i = 0; i < sz; i++)
+    {
+        std::string ex(extra[i]);
+        if (std::string::npos != strCheckName.find(ex))
+            return -EINVAL;
+    }
+
+    return 0;
+}
+
+// return -errno on error.  fi->fh is not set until open time
+
+int
+rbdfs_create(const char *path, mode_t mode, struct fuse_file_info *fi)
+{
+         int r;
+         int order = imageorder;
+
+         r = rbdfs_checkname(path+1);
+         if (r != 0)
+         {
+            return r;  
+         }
+
+         r = rbd_create2(ioctx, path+1, imagesize, imagefeatures, &order);
+         return r;
+}
+
+int
+rbdfs_rename(const char *path, const char *destname
+#if FUSE_VERSION >= FUSE_MAKE_VERSION(3, 0)
+             , unsigned int flags
+#endif
+            )
+{
+    int r;
+
+    r = rbdfs_checkname(destname+1);
+    if (r != 0)
+    {
+      return r;
+    }
+
+    if (strcmp(path, "/") == 0)
+        return -EINVAL;
+
+    return rbd_rename(ioctx, path+1, destname+1);
+}
+
+int
+rbdfs_utimens(const char *path, const struct timespec tv[2]
+#if FUSE_VERSION >= FUSE_MAKE_VERSION(3, 0)
+              , struct fuse_file_info *fi
+#endif
+             )
+{
+	// called on create; not relevant
+	return 0;
+}
+
+int
+rbdfs_unlink(const char *path)
+{
+	int fd = find_openrbd(path+1);
+	if (fd != -1) {
+		struct rbd_openimage *rbd = &opentbl[fd];
+		rbd_close(rbd->image);
+		rbd->image = 0;
+		free(rbd->image_name);
+		rbd->rbd_stat.valid = 0;
+	}
+	return rbd_remove(ioctx, path+1);
+}
+
+
+int
+rbdfs_truncate(const char *path, off_t size
+#if FUSE_VERSION >= FUSE_MAKE_VERSION(3, 0)
+               , struct fuse_file_info *fi
+#endif
+              )
+{
+	int fd;
+	int r;
+	struct rbd_openimage *rbd;
+
+	if ((fd = open_rbd_image(path+1)) < 0)
+		return -ENOENT;
+
+	rbd = &opentbl[fd];
+	fprintf(stderr, "truncate %s to %" PRIdMAX " (0x%" PRIxMAX ")\n",
+          path, size, size);
+	r = rbd_resize(rbd->image, size);
+	if (r < 0)
+		return r;
+
+	r = rbd_stat(rbd->image, &(rbd->rbd_stat.rbd_info),
+		 sizeof(rbd_image_info_t));
+	if (r < 0)
+		return r;
+	return 0;
+}
+
+/**
+ * set an xattr on path, with name/value, length size.
+ * Presumably flags are from Linux, as in XATTR_CREATE or 
+ * XATTR_REPLACE (both "set", but fail if exist vs fail if not exist.
+ *
+ * We accept xattrs only on the root node.
+ *
+ * All values converted with strtoull, so can be expressed in any base
+ */
+
+struct rbdfuse_attr {
+	char *attrname;
+	uint64_t *attrvalp;
+} attrs[] = {
+    { (char*) "user.rbdfuse.imagesize", &imagesize },
+    { (char*) "user.rbdfuse.imageorder", &imageorder },
+    { (char*) "user.rbdfuse.imagefeatures", &imagefeatures },
+    { NULL, NULL }
+};
+
+int
+rbdfs_setxattr(const char *path, const char *name, const char *value,
+	       size_t size,
+	       int flags
+#if defined(DARWIN)
+	       ,uint32_t pos
+#endif
+    )
+{
+	struct rbdfuse_attr *ap;
+	if (strcmp(path, "/") != 0)
+		return -EINVAL;
+
+	for (ap = attrs; ap->attrname != NULL; ap++) {
+		if (strcmp(name, ap->attrname) == 0) {
+			*ap->attrvalp = strtoull(value, NULL, 0);
+			fprintf(stderr, "rbd-fuse: %s set to 0x%" PRIx64 "\n",
+				ap->attrname, *ap->attrvalp);
+			return 0;
+		}
+	}
+	return -EINVAL;
+}
+
+int
+rbdfs_getxattr(const char *path, const char *name, char *value,
+		 size_t size
+#if defined(DARWIN)
+	       ,uint32_t position
+#endif
+  )
+{
+	struct rbdfuse_attr *ap;
+	char buf[128];
+	// allow gets on other files; ls likes to ask for things like
+	// security.*
+
+	for (ap = attrs; ap->attrname != NULL; ap++) {
+		if (strcmp(name, ap->attrname) == 0) {
+			sprintf(buf, "%" PRIu64, *ap->attrvalp);
+			if (value != NULL && size >= strlen(buf))
+				strcpy(value, buf);
+			fprintf(stderr, "rbd-fuse: get %s\n", ap->attrname);
+			return (strlen(buf));
+		}
+	}
+	return 0;
+}
+
+int
+rbdfs_listxattr(const char *path, char *list, size_t len)
+{
+	struct rbdfuse_attr *ap;
+	size_t required_len = 0;
+
+	if (strcmp(path, "/") != 0)
+		return -EINVAL;
+
+	for (ap = attrs; ap->attrname != NULL; ap++)
+		required_len += strlen(ap->attrname) + 1;
+	if (len >= required_len) {
+		for (ap = attrs; ap->attrname != NULL; ap++) {
+			sprintf(list, "%s", ap->attrname);
+			list += strlen(ap->attrname) + 1;
+		}
+	}
+	return required_len;
+}
+
+const static struct fuse_operations rbdfs_oper = {
+  getattr:    rbdfs_getattr,
+  readlink:   0,
+#if FUSE_VERSION < FUSE_MAKE_VERSION(3, 0)
+  getdir:     0,
+#endif
+  mknod:      0,
+  mkdir:      0,
+  unlink:     rbdfs_unlink,
+  rmdir:      0,
+  symlink:    0,
+  rename:     rbdfs_rename,
+  link:       0,
+  chmod:      0,
+  chown:      0,
+  truncate:   rbdfs_truncate,
+#if FUSE_VERSION < FUSE_MAKE_VERSION(3, 0)
+  utime:      0,
+#endif
+  open:	      rbdfs_open,
+  read:	      rbdfs_read,
+  write:      rbdfs_write,
+  statfs:     rbdfs_statfs,
+  flush:      0,
+  release:    0,
+  fsync:      rbdfs_fsync,
+  setxattr:   rbdfs_setxattr,
+  getxattr:   rbdfs_getxattr,
+  listxattr:  rbdfs_listxattr,
+  removexattr: 0,
+  opendir:    rbdfs_opendir,
+  readdir:    rbdfs_readdir,
+  releasedir: rbdfs_releasedir,
+  fsyncdir:   0,
+  init:	      rbdfs_init,
+  destroy:    rbdfs_destroy,
+  access:     0,
+  create:     rbdfs_create,
+#if FUSE_VERSION < FUSE_MAKE_VERSION(3, 0)
+  ftruncate:  0,
+  fgetattr:   0,
+#endif
+  lock:       0,
+  utimens:    rbdfs_utimens,
+  /* skip unimplemented */
+};
+
+} /* extern "C" */
+
+enum {
+	KEY_HELP,
+	KEY_VERSION,
+	KEY_RADOS_POOLNAME,
+	KEY_RADOS_POOLNAME_LONG,
+	KEY_RADOS_NSPACENAME,
+	KEY_RADOS_NSPACENAME_LONG,
+	KEY_RBD_IMAGENAME,
+	KEY_RBD_IMAGENAME_LONG
+};
+
+static struct fuse_opt rbdfs_opts[] = {
+	FUSE_OPT_KEY("-h", KEY_HELP),
+	FUSE_OPT_KEY("--help", KEY_HELP),
+	FUSE_OPT_KEY("-V", KEY_VERSION),
+	FUSE_OPT_KEY("--version", KEY_VERSION),
+	{"-p %s", offsetof(struct rbd_options, pool_name), KEY_RADOS_POOLNAME},
+	{"--poolname=%s", offsetof(struct rbd_options, pool_name),
+	 KEY_RADOS_POOLNAME_LONG},
+	{"-s %s", offsetof(struct rbd_options, nspace_name), KEY_RADOS_NSPACENAME},
+	{"--namespace=%s", offsetof(struct rbd_options, nspace_name),
+	 KEY_RADOS_NSPACENAME_LONG},
+	{"-r %s", offsetof(struct rbd_options, image_name), KEY_RBD_IMAGENAME},
+	{"--image=%s", offsetof(struct rbd_options, image_name),
+	KEY_RBD_IMAGENAME_LONG},
+	FUSE_OPT_END
+};
+
+static void usage(const char *progname)
+{
+	fprintf(stderr,
+"Usage: %s mountpoint [options]\n"
+"\n"
+"General options:\n"
+"    -h   --help            print help\n"
+"    -V   --version         print version\n"
+"    -c   --conf            ceph configuration file [/etc/ceph/ceph.conf]\n"
+"    -p   --poolname        rados pool name [rbd]\n"
+"    -s   --namespace       rados namespace name []\n"
+"    -r   --image           RBD image name\n"
+"\n", progname);
+}
+
+static int rbdfs_opt_proc(void *data, const char *arg, int key,
+			    struct fuse_args *outargs)
+{
+	if (key == KEY_HELP) {
+		usage(outargs->argv[0]);
+		fuse_opt_add_arg(outargs, "-ho");
+		fuse_main(outargs->argc, outargs->argv, &rbdfs_oper, NULL);
+		exit(1);
+	}
+
+	if (key == KEY_VERSION) {
+		fuse_opt_add_arg(outargs, "--version");
+		fuse_main(outargs->argc, outargs->argv, &rbdfs_oper, NULL);
+		exit(0);
+	}
+
+	if (key == KEY_RADOS_POOLNAME) {
+		if (rbd_options.pool_name != NULL) {
+			free(rbd_options.pool_name);
+			rbd_options.pool_name = NULL;
+		}
+		rbd_options.pool_name = strdup(arg+2);
+		return 0;
+	}
+
+	if (key == KEY_RADOS_NSPACENAME) {
+		if (rbd_options.nspace_name != NULL) {
+			free(rbd_options.nspace_name);
+			rbd_options.nspace_name = NULL;
+		}
+		rbd_options.nspace_name = strdup(arg+2);
+		return 0;
+	}
+
+	if (key == KEY_RBD_IMAGENAME) {
+		if (rbd_options.image_name!= NULL) {
+			free(rbd_options.image_name);
+			rbd_options.image_name = NULL;
+		}
+		rbd_options.image_name = strdup(arg+2);
+		return 0;
+	}
+
+	return 1;
+}
+
+void
+simple_err(const char *msg, int err)
+{
+	fprintf(stderr, "%s: %s\n", msg, strerror(-err));
+	return;
+}
+
+int
+connect_to_cluster(rados_t *pcluster)
+{
+	int r;
+	global_init_postfork_start(g_ceph_context);
+	common_init_finish(g_ceph_context);
+	global_init_postfork_finish(g_ceph_context);
+
+	r = rados_create_with_context(pcluster, g_ceph_context);
+	if (r < 0) {
+		simple_err("Could not create cluster handle", r);
+		return r;
+	}
+
+	r = rados_connect(*pcluster);
+	if (r < 0) {
+		simple_err("Error connecting to cluster", r);
+		rados_shutdown(*pcluster);
+		return r;
+	}
+
+	return 0;
+}
+
+#define OPT_NOT_FOUND -1
+
+int main(int argc, const char *argv[])
+{
+	memset(&rbd_image_data, 0, sizeof(rbd_image_data));
+
+	// librados will filter out -r/-f/-d options from command-line
+	std::map<std::string, int> filter_options = {
+		{"-r", OPT_NOT_FOUND},
+		{"-f", OPT_NOT_FOUND},
+		{"-d", OPT_NOT_FOUND}};
+
+	std::set<std::string> require_arg_options = {"-r"};
+
+	std::vector<const char*> arg_vector;
+	for (auto idx = 0; idx < argc; ++idx) {
+		auto it = filter_options.find(argv[idx]);
+		if (it != filter_options.end()) {
+			it->second = idx;
+		}
+		arg_vector.push_back(argv[idx]);
+	}
+
+	auto cct = global_init(NULL, arg_vector, CEPH_ENTITY_TYPE_CLIENT,
+			       CODE_ENVIRONMENT_DAEMON,
+			       CINIT_FLAG_UNPRIVILEGED_DAEMON_DEFAULTS);
+	g_ceph_context->_conf.set_val_or_die("pid_file", "");
+	g_ceph_context->_conf.set_val_or_die("daemonize", "true");
+
+	if (global_init_prefork(g_ceph_context) < 0) {
+		fprintf(stderr, "Failed to initialize librados\n");
+		exit(1);
+	}
+
+	for (auto& it : filter_options) {
+		if (it.second != OPT_NOT_FOUND) {
+			arg_vector.push_back(it.first.c_str());
+			if (require_arg_options.count(it.first) &&
+			    it.second + 1 < argc) {
+				arg_vector.push_back(argv[it.second + 1]);
+			}
+		}
+	}
+
+	struct fuse_args args = FUSE_ARGS_INIT((int)arg_vector.size(),
+					       (char**)&arg_vector.front());
+	if (fuse_opt_parse(&args, &rbd_options, rbdfs_opts,
+			   rbdfs_opt_proc) == -1) {
+		exit(1);
+	}
+
+	return fuse_main(args.argc, args.argv, &rbdfs_oper, NULL);
+}