Adding upstream version 14.2.21.upstream/14.2.21upstream

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

1 files changed, 3031 insertions, 0 deletions

diff --git a/src/java/native/libcephfs_jni.cc b/src/java/native/libcephfs_jni.cc
new file mode 100644
index 00000000..74ef8dcd
--- /dev/null
+++ b/src/java/native/libcephfs_jni.cc
@@ -0,0 +1,3031 @@
+/*
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/un.h>
+#include <jni.h>
+
+#include "ScopedLocalRef.h"
+#include "JniConstants.h"
+
+#include "include/cephfs/libcephfs.h"
+#include "common/dout.h"
+
+#define dout_subsys ceph_subsys_javaclient
+
+#include "com_ceph_fs_CephMount.h"
+
+#define CEPH_STAT_CP "com/ceph/fs/CephStat"
+#define CEPH_STAT_VFS_CP "com/ceph/fs/CephStatVFS"
+#define CEPH_FILE_EXTENT_CP "com/ceph/fs/CephFileExtent"
+#define CEPH_MOUNT_CP "com/ceph/fs/CephMount"
+#define CEPH_NOTMOUNTED_CP "com/ceph/fs/CephNotMountedException"
+#define CEPH_FILEEXISTS_CP "com/ceph/fs/CephFileAlreadyExistsException"
+#define CEPH_ALREADYMOUNTED_CP "com/ceph/fs/CephAlreadyMountedException"
+#define CEPH_NOTDIR_CP "com/ceph/fs/CephNotDirectoryException"
+
+/*
+ * Flags to open(). must be synchronized with CephMount.java
+ *
+ * There are two versions of flags: the version in Java and the version in the
+ * target library (e.g. libc or libcephfs). We control the Java values and map
+ * to the target value with fixup_* functions below. This is much faster than
+ * keeping the values in Java and making a cross-JNI up-call to retrieve them,
+ * and makes it easy to keep any platform specific value changes in this file.
+ */
+#define JAVA_O_RDONLY    1
+#define JAVA_O_RDWR      2
+#define JAVA_O_APPEND    4
+#define JAVA_O_CREAT     8
+#define JAVA_O_TRUNC     16
+#define JAVA_O_EXCL      32
+#define JAVA_O_WRONLY    64
+#define JAVA_O_DIRECTORY 128
+
+/*
+ * Whence flags for seek(). sync with CephMount.java if changed.
+ *
+ * Mapping of SEEK_* done in seek function.
+ */
+#define JAVA_SEEK_SET 1
+#define JAVA_SEEK_CUR 2
+#define JAVA_SEEK_END 3
+
+/*
+ * File attribute flags. sync with CephMount.java if changed.
+ */
+#define JAVA_SETATTR_MODE  1
+#define JAVA_SETATTR_UID   2
+#define JAVA_SETATTR_GID   4
+#define JAVA_SETATTR_MTIME 8
+#define JAVA_SETATTR_ATIME 16
+
+/*
+ * Setxattr flags. sync with CephMount.java if changed.
+ */
+#define JAVA_XATTR_CREATE   1
+#define JAVA_XATTR_REPLACE  2
+#define JAVA_XATTR_NONE     3
+
+/*
+ * flock flags. sync with CephMount.java if changed.
+ */
+#define JAVA_LOCK_SH 1
+#define JAVA_LOCK_EX 2
+#define JAVA_LOCK_NB 4
+#define JAVA_LOCK_UN 8
+
+/* Map JAVA_O_* open flags to values in libc */
+static inline int fixup_open_flags(jint jflags)
+{
+	int ret = 0;
+
+#define FIXUP_OPEN_FLAG(name) \
+	if (jflags & JAVA_##name) \
+		ret |= name;
+
+	FIXUP_OPEN_FLAG(O_RDONLY)
+	FIXUP_OPEN_FLAG(O_RDWR)
+	FIXUP_OPEN_FLAG(O_APPEND)
+	FIXUP_OPEN_FLAG(O_CREAT)
+	FIXUP_OPEN_FLAG(O_TRUNC)
+	FIXUP_OPEN_FLAG(O_EXCL)
+	FIXUP_OPEN_FLAG(O_WRONLY)
+	FIXUP_OPEN_FLAG(O_DIRECTORY)
+
+#undef FIXUP_OPEN_FLAG
+
+	return ret;
+}
+
+/* Map JAVA_SETATTR_* to values in ceph lib */
+static inline int fixup_attr_mask(jint jmask)
+{
+	int mask = 0;
+
+#define FIXUP_ATTR_MASK(name) \
+	if (jmask & JAVA_##name) \
+		mask |= CEPH_##name;
+
+	FIXUP_ATTR_MASK(SETATTR_MODE)
+	FIXUP_ATTR_MASK(SETATTR_UID)
+	FIXUP_ATTR_MASK(SETATTR_GID)
+	FIXUP_ATTR_MASK(SETATTR_MTIME)
+	FIXUP_ATTR_MASK(SETATTR_ATIME)
+
+#undef FIXUP_ATTR_MASK
+
+	return mask;
+}
+
+/* Cached field IDs for com.ceph.fs.CephStat */
+static jfieldID cephstat_mode_fid;
+static jfieldID cephstat_uid_fid;
+static jfieldID cephstat_gid_fid;
+static jfieldID cephstat_size_fid;
+static jfieldID cephstat_blksize_fid;
+static jfieldID cephstat_blocks_fid;
+static jfieldID cephstat_a_time_fid;
+static jfieldID cephstat_m_time_fid;
+static jfieldID cephstat_is_file_fid;
+static jfieldID cephstat_is_directory_fid;
+static jfieldID cephstat_is_symlink_fid;
+
+/* Cached field IDs for com.ceph.fs.CephStatVFS */
+static jfieldID cephstatvfs_bsize_fid;
+static jfieldID cephstatvfs_frsize_fid;
+static jfieldID cephstatvfs_blocks_fid;
+static jfieldID cephstatvfs_bavail_fid;
+static jfieldID cephstatvfs_files_fid;
+static jfieldID cephstatvfs_fsid_fid;
+static jfieldID cephstatvfs_namemax_fid;
+
+/* Cached field IDs for com.ceph.fs.CephMount */
+static jfieldID cephmount_instance_ptr_fid;
+
+/* Cached field IDs for com.ceph.fs.CephFileExtent */
+static jclass cephfileextent_cls;
+static jmethodID cephfileextent_ctor_fid;
+
+/*
+ * Exception throwing helper. Adapted from Apache Hadoop header
+ * org_apache_hadoop.h by adding the do {} while (0) construct.
+ */
+#define THROW(env, exception_name, message) \
+	do { \
+		jclass ecls = env->FindClass(exception_name); \
+		if (ecls) { \
+			int ret = env->ThrowNew(ecls, message); \
+			if (ret < 0) { \
+				printf("(CephFS) Fatal Error\n"); \
+			} \
+			env->DeleteLocalRef(ecls); \
+		} \
+	} while (0)
+
+
+static void cephThrowNullArg(JNIEnv *env, const char *msg)
+{
+	THROW(env, "java/lang/NullPointerException", msg);
+}
+
+static void cephThrowOutOfMemory(JNIEnv *env, const char *msg)
+{
+	THROW(env, "java/lang/OutOfMemoryError", msg);
+}
+
+static void cephThrowInternal(JNIEnv *env, const char *msg)
+{
+	THROW(env, "java/lang/InternalError", msg);
+}
+
+static void cephThrowIndexBounds(JNIEnv *env, const char *msg)
+{
+	THROW(env, "java/lang/IndexOutOfBoundsException", msg);
+}
+
+static void cephThrowIllegalArg(JNIEnv *env, const char *msg)
+{
+	THROW(env, "java/lang/IllegalArgumentException", msg);
+}
+
+static void cephThrowFNF(JNIEnv *env, const char *msg)
+{
+	THROW(env, "java/io/FileNotFoundException", msg);
+}
+
+static void cephThrowFileExists(JNIEnv *env, const char *msg)
+{
+	THROW(env, CEPH_FILEEXISTS_CP, msg);
+}
+
+static void cephThrowNotDir(JNIEnv *env, const char *msg)
+{
+	THROW(env, CEPH_NOTDIR_CP, msg);
+}
+
+static void handle_error(JNIEnv *env, int rc)
+{
+	switch (rc) {
+		case -ENOENT:
+			cephThrowFNF(env, "");
+			return;
+		case -EEXIST:
+			cephThrowFileExists(env, "");
+			return;
+		case -ENOTDIR:
+			cephThrowNotDir(env, "");
+			return;
+		default:
+			break;
+	}
+
+	THROW(env, "java/io/IOException", strerror(-rc));
+}
+
+#define CHECK_ARG_NULL(v, m, r) do { \
+	if (!(v)) { \
+		cephThrowNullArg(env, (m)); \
+		return (r); \
+	} } while (0)
+
+#define CHECK_ARG_BOUNDS(c, m, r) do { \
+	if ((c)) { \
+		cephThrowIndexBounds(env, (m)); \
+		return (r); \
+	} } while (0)
+
+#define CHECK_MOUNTED(_c, _r) do { \
+	if (!ceph_is_mounted((_c))) { \
+		THROW(env, CEPH_NOTMOUNTED_CP, "not mounted"); \
+		return (_r); \
+	} } while (0)
+
+/*
+ * Cast a jlong to ceph_mount_info. Each JNI function is expected to pass in
+ * the class instance variable instance_ptr. Passing a parameter is faster
+ * than reaching back into Java via an upcall to retrieve this pointer.
+ */
+static inline struct ceph_mount_info *get_ceph_mount(jlong j_mntp)
+{
+	return (struct ceph_mount_info *)j_mntp;
+}
+
+/*
+ * Setup cached field IDs
+ */
+static void setup_field_ids(JNIEnv *env, jclass clz)
+{
+	jclass cephstat_cls;
+	jclass cephstatvfs_cls;
+	jclass tmp_cephfileextent_cls;
+
+/*
+ * Get a fieldID from a class with a specific type
+ *
+ * clz: jclass
+ * field: field in clz
+ * type: integer, long, etc..
+ *
+ * This macro assumes some naming convention that is used
+ * only in this file:
+ *
+ *   GETFID(cephstat, mode, I) gets translated into
+ *     cephstat_mode_fid = env->GetFieldID(cephstat_cls, "mode", "I");
+ */
+#define GETFID(clz, field, type) do { \
+	clz ## _ ## field ## _fid = env->GetFieldID(clz ## _cls, #field, #type); \
+	if ( ! clz ## _ ## field ## _fid ) \
+		return; \
+	} while (0)
+
+	/* Cache CephStat fields */
+
+	cephstat_cls = env->FindClass(CEPH_STAT_CP);
+	if (!cephstat_cls)
+		return;
+
+	GETFID(cephstat, mode, I);
+	GETFID(cephstat, uid, I);
+	GETFID(cephstat, gid, I);
+	GETFID(cephstat, size, J);
+	GETFID(cephstat, blksize, J);
+	GETFID(cephstat, blocks, J);
+	GETFID(cephstat, a_time, J);
+	GETFID(cephstat, m_time, J);
+	GETFID(cephstat, is_file, Z);
+	GETFID(cephstat, is_directory, Z);
+	GETFID(cephstat, is_symlink, Z);
+
+	/* Cache CephStatVFS fields */
+
+	cephstatvfs_cls = env->FindClass(CEPH_STAT_VFS_CP);
+	if (!cephstatvfs_cls)
+		return;
+
+	GETFID(cephstatvfs, bsize, J);
+	GETFID(cephstatvfs, frsize, J);
+	GETFID(cephstatvfs, blocks, J);
+	GETFID(cephstatvfs, bavail, J);
+	GETFID(cephstatvfs, files, J);
+	GETFID(cephstatvfs, fsid, J);
+	GETFID(cephstatvfs, namemax, J);
+
+	/* Cache CephFileExtent fields */
+
+	tmp_cephfileextent_cls = env->FindClass(CEPH_FILE_EXTENT_CP);
+	if (!tmp_cephfileextent_cls)
+		return;
+
+	cephfileextent_cls = (jclass)env->NewGlobalRef(tmp_cephfileextent_cls);
+	env->DeleteLocalRef(tmp_cephfileextent_cls);
+
+	cephfileextent_ctor_fid = env->GetMethodID(cephfileextent_cls, "<init>", "(JJ[I)V");
+	if (!cephfileextent_ctor_fid)
+		return;
+
+  JniConstants::init(env);
+
+#undef GETFID
+
+	cephmount_instance_ptr_fid = env->GetFieldID(clz, "instance_ptr", "J");
+}
+
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_initialize
+ * Signature: ()V
+ */
+JNIEXPORT void JNICALL Java_com_ceph_fs_CephMount_native_1initialize
+	(JNIEnv *env, jclass clz)
+{
+	setup_field_ids(env, clz);
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_create
+ * Signature: (Lcom/ceph/fs/CephMount;Ljava/lang/String;)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1create
+	(JNIEnv *env, jclass clz, jobject j_cephmount, jstring j_id)
+{
+	struct ceph_mount_info *cmount;
+	const char *c_id = NULL;
+	int ret;
+
+	CHECK_ARG_NULL(j_cephmount, "@mount is null", -1);
+
+	if (j_id) {
+		c_id = env->GetStringUTFChars(j_id, NULL);
+		if (!c_id) {
+			cephThrowInternal(env, "Failed to pin memory");
+			return -1;
+		}
+	}
+
+	ret = ceph_create(&cmount, c_id);
+
+	if (c_id)
+		env->ReleaseStringUTFChars(j_id, c_id);
+
+	if (ret) {
+		THROW(env, "java/lang/RuntimeException", "failed to create Ceph mount object");
+		return ret;
+	}
+
+	env->SetLongField(j_cephmount, cephmount_instance_ptr_fid, (long)cmount);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_mount
+ * Signature: (JLjava/lang/String;)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1mount
+	(JNIEnv *env, jclass clz, jlong j_mntp, jstring j_root)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	const char *c_root = NULL;
+	int ret;
+
+	/*
+	 * Toss a message up if we are already mounted.
+	 */
+	if (ceph_is_mounted(cmount)) {
+		THROW(env, CEPH_ALREADYMOUNTED_CP, "");
+		return -1;
+	}
+
+	if (j_root) {
+		c_root = env->GetStringUTFChars(j_root, NULL);
+		if (!c_root) {
+			cephThrowInternal(env, "Failed to pin memory");
+			return -1;
+		}
+	}
+
+	ldout(cct, 10) << "jni: ceph_mount: " << (c_root ? c_root : "<NULL>") << dendl;
+
+	ret = ceph_mount(cmount, c_root);
+
+	ldout(cct, 10) << "jni: ceph_mount: exit ret " << ret << dendl;
+
+	if (c_root)
+		env->ReleaseStringUTFChars(j_root, c_root);
+
+	if (ret)
+		handle_error(env, ret);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_unmount
+ * Signature: (J)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1unmount
+  (JNIEnv *env, jclass clz, jlong j_mntp)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	int ret;
+
+	ldout(cct, 10) << "jni: ceph_unmount enter" << dendl;
+
+	CHECK_MOUNTED(cmount, -1);
+
+	ret = ceph_unmount(cmount);
+
+	ldout(cct, 10) << "jni: ceph_unmount exit ret " << ret << dendl;
+
+	if (ret)
+		handle_error(env, ret);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_release
+ * Signature: (J)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1release
+  (JNIEnv *env, jclass clz, jlong j_mntp)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	int ret;
+
+	ldout(cct, 10) << "jni: ceph_release called" << dendl;
+
+	ret = ceph_release(cmount);
+
+	if (ret)
+		handle_error(env, ret);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_conf_set
+ * Signature: (JLjava/lang/String;Ljava/lang/String;)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1conf_1set
+	(JNIEnv *env, jclass clz, jlong j_mntp, jstring j_opt, jstring j_val)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	const char *c_opt, *c_val;
+	int ret;
+
+	CHECK_ARG_NULL(j_opt, "@option is null", -1);
+	CHECK_ARG_NULL(j_val, "@value is null", -1);
+
+	c_opt = env->GetStringUTFChars(j_opt, NULL);
+	if (!c_opt) {
+		cephThrowInternal(env, "failed to pin memory");
+		return -1;
+	}
+
+	c_val = env->GetStringUTFChars(j_val, NULL);
+	if (!c_val) {
+		env->ReleaseStringUTFChars(j_opt, c_opt);
+		cephThrowInternal(env, "failed to pin memory");
+		return -1;
+	}
+
+	ldout(cct, 10) << "jni: conf_set: opt " << c_opt << " val " << c_val << dendl;
+
+	ret = ceph_conf_set(cmount, c_opt, c_val);
+
+	ldout(cct, 10) << "jni: conf_set: exit ret " << ret << dendl;
+
+	env->ReleaseStringUTFChars(j_opt, c_opt);
+	env->ReleaseStringUTFChars(j_val, c_val);
+
+	if (ret)
+		handle_error(env, ret);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_conf_get
+ * Signature: (JLjava/lang/String;)Ljava/lang/String;
+ */
+JNIEXPORT jstring JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1conf_1get
+	(JNIEnv *env, jclass clz, jlong j_mntp, jstring j_opt)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	const char *c_opt;
+	jstring value = NULL;
+	int ret, buflen;
+	char *buf;
+
+	CHECK_ARG_NULL(j_opt, "@option is null", NULL);
+
+	c_opt = env->GetStringUTFChars(j_opt, NULL);
+	if (!c_opt) {
+		cephThrowInternal(env, "failed to pin memory");
+		return NULL;
+	}
+
+	buflen = 128;
+	buf = new (std::nothrow) char[buflen];
+	if (!buf) {
+		cephThrowOutOfMemory(env, "head allocation failed");
+		goto out;
+	}
+
+	while (1) {
+		memset(buf, 0, sizeof(char)*buflen);
+		ldout(cct, 10) << "jni: conf_get: opt " << c_opt << " len " << buflen << dendl;
+		ret = ceph_conf_get(cmount, c_opt, buf, buflen);
+		if (ret == -ENAMETOOLONG) {
+			buflen *= 2;
+			delete [] buf;
+			buf = new (std::nothrow) char[buflen];
+			if (!buf) {
+				cephThrowOutOfMemory(env, "head allocation failed");
+				goto out;
+			}
+		} else
+			break;
+	}
+
+	ldout(cct, 10) << "jni: conf_get: ret " << ret << dendl;
+
+	if (ret == 0)
+		value = env->NewStringUTF(buf);
+	else if (ret != -ENOENT)
+		handle_error(env, ret);
+
+	delete [] buf;
+
+out:
+	env->ReleaseStringUTFChars(j_opt, c_opt);
+	return value;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_conf_read_file
+ * Signature: (JLjava/lang/String;)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1conf_1read_1file
+	(JNIEnv *env, jclass clz, jlong j_mntp, jstring j_path)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	const char *c_path;
+	int ret;
+
+	CHECK_ARG_NULL(j_path, "@path is null", -1);
+
+	c_path = env->GetStringUTFChars(j_path, NULL);
+	if (!c_path) {
+		cephThrowInternal(env, "failed to pin memory");
+		return -1;
+	}
+
+	ldout(cct, 10) << "jni: conf_read_file: path " << c_path << dendl;
+
+	ret = ceph_conf_read_file(cmount, c_path);
+
+	ldout(cct, 10) << "jni: conf_read_file: exit ret " << ret << dendl;
+
+	env->ReleaseStringUTFChars(j_path, c_path);
+
+	if (ret)
+		handle_error(env, ret);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_statfs
+ * Signature: (JLjava/lang/String;Lcom/ceph/fs/CephStatVFS;)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1statfs
+	(JNIEnv *env, jclass clz, jlong j_mntp, jstring j_path, jobject j_cephstatvfs)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	const char *c_path;
+	struct statvfs st;
+	int ret;
+
+	CHECK_ARG_NULL(j_path, "@path is null", -1);
+	CHECK_ARG_NULL(j_cephstatvfs, "@stat is null", -1);
+	CHECK_MOUNTED(cmount, -1);
+
+	c_path = env->GetStringUTFChars(j_path, NULL);
+	if (!c_path) {
+		cephThrowInternal(env, "Failed to pin memory");
+		return -1;
+	}
+
+	ldout(cct, 10) << "jni: statfs: path " << c_path << dendl;
+
+	ret = ceph_statfs(cmount, c_path, &st);
+
+	ldout(cct, 10) << "jni: statfs: exit ret " << ret << dendl;
+
+	env->ReleaseStringUTFChars(j_path, c_path);
+
+	if (ret) {
+		handle_error(env, ret);
+		return ret;
+	}
+
+	env->SetLongField(j_cephstatvfs, cephstatvfs_bsize_fid, st.f_bsize);
+	env->SetLongField(j_cephstatvfs, cephstatvfs_frsize_fid, st.f_frsize);
+	env->SetLongField(j_cephstatvfs, cephstatvfs_blocks_fid, st.f_blocks);
+	env->SetLongField(j_cephstatvfs, cephstatvfs_bavail_fid, st.f_bavail);
+	env->SetLongField(j_cephstatvfs, cephstatvfs_files_fid, st.f_files);
+	env->SetLongField(j_cephstatvfs, cephstatvfs_fsid_fid, st.f_fsid);
+	env->SetLongField(j_cephstatvfs, cephstatvfs_namemax_fid, st.f_namemax);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_getcwd
+ * Signature: (J)Ljava/lang/String;
+ */
+JNIEXPORT jstring JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1getcwd
+	(JNIEnv *env, jclass clz, jlong j_mntp)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	const char *c_cwd;
+
+	CHECK_MOUNTED(cmount, NULL);
+
+	ldout(cct, 10) << "jni: getcwd: enter" << dendl;
+
+	c_cwd = ceph_getcwd(cmount);
+	if (!c_cwd) {
+		cephThrowOutOfMemory(env, "ceph_getcwd");
+		return NULL;
+	}
+
+	ldout(cct, 10) << "jni: getcwd: exit ret " << c_cwd << dendl;
+
+	return env->NewStringUTF(c_cwd);
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_chdir
+ * Signature: (JLjava/lang/String;)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1chdir
+	(JNIEnv *env, jclass clz, jlong j_mntp, jstring j_path)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	const char *c_path;
+	int ret;
+
+	CHECK_ARG_NULL(j_path, "@path is null", -1);
+	CHECK_MOUNTED(cmount, -1);
+
+	c_path = env->GetStringUTFChars(j_path, NULL);
+	if (!c_path) {
+		cephThrowInternal(env, "failed to pin memory");
+		return -1;
+	}
+
+	ldout(cct, 10) << "jni: chdir: path " << c_path << dendl;
+
+	ret = ceph_chdir(cmount, c_path);
+
+	ldout(cct, 10) << "jni: chdir: exit ret " << ret << dendl;
+
+	env->ReleaseStringUTFChars(j_path, c_path);
+
+	if (ret)
+		handle_error(env, ret);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_listdir
+ * Signature: (JLjava/lang/String;)[Ljava/lang/String;
+ */
+JNIEXPORT jobjectArray JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1listdir
+	(JNIEnv *env, jclass clz, jlong j_mntp, jstring j_path)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	struct ceph_dir_result *dirp;
+	list<string>::iterator it;
+	list<string> contents;
+	const char *c_path;
+	jobjectArray dirlist;
+	string *ent;
+	int ret, buflen, bufpos, i;
+	jstring name;
+	char *buf;
+
+	CHECK_ARG_NULL(j_path, "@path is null", NULL);
+	CHECK_MOUNTED(cmount, NULL);
+
+	c_path = env->GetStringUTFChars(j_path, NULL);
+	if (!c_path) {
+		cephThrowInternal(env, "failed to pin memory");
+		return NULL;
+	}
+
+	ldout(cct, 10) << "jni: listdir: opendir: path " << c_path << dendl;
+
+	/* ret < 0 also includes -ENOTDIR which should return NULL */
+	ret = ceph_opendir(cmount, c_path, &dirp);
+	if (ret) {
+		env->ReleaseStringUTFChars(j_path, c_path);
+		handle_error(env, ret);
+		return NULL;
+	}
+
+	ldout(cct, 10) << "jni: listdir: opendir: exit ret " << ret << dendl;
+
+	/* buffer for ceph_getdnames() results */
+	buflen = 256;
+	buf = new (std::nothrow) char[buflen];
+	if (!buf)  {
+		cephThrowOutOfMemory(env, "heap allocation failed");
+		goto out;
+	}
+
+	while (1) {
+		ldout(cct, 10) << "jni: listdir: getdnames: enter" << dendl;
+		ret = ceph_getdnames(cmount, dirp, buf, buflen);
+		if (ret == -ERANGE) {
+			delete [] buf;
+			buflen *= 2;
+			buf = new (std::nothrow) char[buflen];
+			if (!buf)  {
+				cephThrowOutOfMemory(env, "heap allocation failed");
+				goto out;
+			}
+			continue;
+		}
+
+		ldout(cct, 10) << "jni: listdir: getdnames: exit ret " << ret << dendl;
+
+		if (ret <= 0)
+			break;
+
+		/* got at least one name */
+		bufpos = 0;
+		while (bufpos < ret) {
+			ent = new (std::nothrow) string(buf + bufpos);
+			if (!ent) {
+				delete [] buf;
+				cephThrowOutOfMemory(env, "heap allocation failed");
+				goto out;
+			}
+
+			/* filter out dot files: xref: java.io.File::list() */
+			if (ent->compare(".") && ent->compare("..")) {
+				contents.push_back(*ent);
+				ldout(cct, 20) << "jni: listdir: take path " << *ent << dendl;
+			}
+
+			bufpos += ent->size() + 1;
+			delete ent;
+		}
+	}
+
+	delete [] buf;
+
+	if (ret < 0) {
+		handle_error(env, ret);
+		goto out;
+	}
+
+	/* directory list */
+	dirlist = env->NewObjectArray(contents.size(), env->FindClass("java/lang/String"), NULL);
+	if (!dirlist)
+		goto out;
+
+	/*
+	* Fill directory listing array.
+	*
+	* FIXME: how should a partially filled array be cleaned-up properly?
+	*/
+	for (i = 0, it = contents.begin(); it != contents.end(); ++it) {
+		name = env->NewStringUTF(it->c_str());
+		if (!name)
+			goto out;
+		env->SetObjectArrayElement(dirlist, i++, name);
+		if (env->ExceptionOccurred())
+			goto out;
+		env->DeleteLocalRef(name);
+	}
+
+	env->ReleaseStringUTFChars(j_path, c_path);
+	ceph_closedir(cmount, dirp);
+
+	return dirlist;
+
+out:
+	env->ReleaseStringUTFChars(j_path, c_path);
+	ceph_closedir(cmount, dirp);
+	return NULL;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_link
+ * Signature: (JLjava/lang/String;Ljava/lang/String;)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1link
+	(JNIEnv *env, jclass clz, jlong j_mntp, jstring j_oldpath, jstring j_newpath)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	const char *c_oldpath, *c_newpath;
+	int ret;
+
+	CHECK_ARG_NULL(j_oldpath, "@oldpath is null", -1);
+	CHECK_ARG_NULL(j_newpath, "@newpath is null", -1);
+	CHECK_MOUNTED(cmount, -1);
+
+	c_oldpath = env->GetStringUTFChars(j_oldpath, NULL);
+	if (!c_oldpath) {
+		cephThrowInternal(env, "failed to pin memory");
+		return -1;
+	}
+
+	c_newpath = env->GetStringUTFChars(j_newpath, NULL);
+	if (!c_newpath) {
+		env->ReleaseStringUTFChars(j_oldpath, c_oldpath);
+		cephThrowInternal(env, "failed to pin memory");
+		return -1;
+	}
+
+	ldout(cct, 10) << "jni: link: oldpath " << c_oldpath <<
+		" newpath " << c_newpath << dendl;
+
+	ret = ceph_link(cmount, c_oldpath, c_newpath);
+
+	ldout(cct, 10) << "jni: link: exit ret " << ret << dendl;
+
+	env->ReleaseStringUTFChars(j_oldpath, c_oldpath);
+	env->ReleaseStringUTFChars(j_newpath, c_newpath);
+
+	if (ret)
+		handle_error(env, ret);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_unlink
+ * Signature: (JLjava/lang/String;)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1unlink
+	(JNIEnv *env, jclass clz, jlong j_mntp, jstring j_path)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	const char *c_path;
+	int ret;
+
+	CHECK_ARG_NULL(j_path, "@path is null", -1);
+	CHECK_MOUNTED(cmount, -1);
+
+	c_path = env->GetStringUTFChars(j_path, NULL);
+	if (!c_path) {
+		cephThrowInternal(env, "failed to pin memory");
+		return -1;
+	}
+
+	ldout(cct, 10) << "jni: unlink: path " << c_path << dendl;
+
+	ret = ceph_unlink(cmount, c_path);
+
+	ldout(cct, 10) << "jni: unlink: exit ret " << ret << dendl;
+
+	env->ReleaseStringUTFChars(j_path, c_path);
+
+	if (ret)
+		handle_error(env, ret);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_rename
+ * Signature: (JLjava/lang/String;Ljava/lang/String;)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1rename
+	(JNIEnv *env, jclass clz, jlong j_mntp, jstring j_from, jstring j_to)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	const char *c_from, *c_to;
+	int ret;
+
+	CHECK_ARG_NULL(j_from, "@from is null", -1);
+	CHECK_ARG_NULL(j_to, "@to is null", -1);
+	CHECK_MOUNTED(cmount, -1);
+
+	c_from = env->GetStringUTFChars(j_from, NULL);
+	if (!c_from) {
+		cephThrowInternal(env, "Failed to pin memory!");
+		return -1;
+	}
+
+	c_to = env->GetStringUTFChars(j_to, NULL);
+	if (!c_to) {
+		env->ReleaseStringUTFChars(j_from, c_from);
+		cephThrowInternal(env, "Failed to pin memory.");
+		return -1;
+	}
+
+	ldout(cct, 10) << "jni: rename: from " << c_from << " to " << c_to << dendl;
+
+	ret = ceph_rename(cmount, c_from, c_to);
+
+	ldout(cct, 10) << "jni: rename: exit ret " << ret << dendl;
+
+	env->ReleaseStringUTFChars(j_from, c_from);
+	env->ReleaseStringUTFChars(j_to, c_to);
+
+	if (ret)
+		handle_error(env, ret);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_mkdir
+ * Signature: (JLjava/lang/String;I)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1mkdir
+	(JNIEnv *env, jclass clz, jlong j_mntp, jstring j_path, jint j_mode)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	const char *c_path;
+	int ret;
+
+	CHECK_ARG_NULL(j_path, "@path is null", -1);
+	CHECK_MOUNTED(cmount, -1);
+
+	c_path = env->GetStringUTFChars(j_path, NULL);
+	if (!c_path) {
+		cephThrowInternal(env, "failed to pin memory");
+		return -1;
+	}
+
+	ldout(cct, 10) << "jni: mkdir: path " << c_path << " mode " << (int)j_mode << dendl;
+
+	ret = ceph_mkdir(cmount, c_path, (int)j_mode);
+
+	ldout(cct, 10) << "jni: mkdir: exit ret " << ret << dendl;
+
+	env->ReleaseStringUTFChars(j_path, c_path);
+
+	if (ret)
+		handle_error(env, ret);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_mkdirs
+ * Signature: (JLjava/lang/String;I)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1mkdirs
+	(JNIEnv *env, jclass clz, jlong j_mntp, jstring j_path, jint j_mode)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	const char *c_path;
+	int ret;
+
+	CHECK_ARG_NULL(j_path, "@path is null", -1);
+	CHECK_MOUNTED(cmount, -1);
+
+	c_path = env->GetStringUTFChars(j_path, NULL);
+	if (!c_path) {
+		cephThrowInternal(env, "failed to pin memory");
+		return -1;
+	}
+
+	ldout(cct, 10) << "jni: mkdirs: path " << c_path << " mode " << (int)j_mode << dendl;
+
+	ret = ceph_mkdirs(cmount, c_path, (int)j_mode);
+
+	ldout(cct, 10) << "jni: mkdirs: exit ret " << ret << dendl;
+
+	env->ReleaseStringUTFChars(j_path, c_path);
+
+	if (ret)
+		handle_error(env, ret);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_rmdir
+ * Signature: (JLjava/lang/String;)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1rmdir
+	(JNIEnv *env, jclass clz, jlong j_mntp, jstring j_path)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	const char *c_path;
+	int ret;
+
+	CHECK_ARG_NULL(j_path, "@path is null", -1);
+	CHECK_MOUNTED(cmount, -1);
+
+	c_path = env->GetStringUTFChars(j_path, NULL);
+	if (!c_path) {
+		cephThrowInternal(env, "failed to pin memory");
+		return -1;
+	}
+
+	ldout(cct, 10) << "jni: rmdir: path " << c_path << dendl;
+
+	ret = ceph_rmdir(cmount, c_path);
+
+	ldout(cct, 10) << "jni: rmdir: exit ret " << ret << dendl;
+
+	env->ReleaseStringUTFChars(j_path, c_path);
+
+	if (ret)
+		handle_error(env, ret);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_readlink
+ * Signature: (JLjava/lang/String;)Ljava/lang/String;
+ */
+JNIEXPORT jstring JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1readlink
+  (JNIEnv *env, jclass clz, jlong j_mntp, jstring j_path)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	const char *c_path;
+	char *linkname;
+	struct ceph_statx stx;
+	jstring j_linkname;
+
+	CHECK_ARG_NULL(j_path, "@path is null", NULL);
+	CHECK_MOUNTED(cmount, NULL);
+
+	c_path = env->GetStringUTFChars(j_path, NULL);
+	if (!c_path) {
+		cephThrowInternal(env, "failed to pin memory");
+		return NULL;
+	}
+
+	for (;;) {
+		ldout(cct, 10) << "jni: readlink: lstatx " << c_path << dendl;
+		int ret = ceph_statx(cmount, c_path, &stx, CEPH_STATX_SIZE,
+				     AT_SYMLINK_NOFOLLOW);
+		ldout(cct, 10) << "jni: readlink: lstat exit ret " << ret << dendl;
+		if (ret) {
+			env->ReleaseStringUTFChars(j_path, c_path);
+			handle_error(env, ret);
+			return NULL;
+		}
+
+		linkname = new (std::nothrow) char[stx.stx_size + 1];
+		if (!linkname) {
+			env->ReleaseStringUTFChars(j_path, c_path);
+			cephThrowOutOfMemory(env, "head allocation failed");
+			return NULL;
+		}
+
+		ldout(cct, 10) << "jni: readlink: size " << stx.stx_size << " path " << c_path << dendl;
+
+		ret = ceph_readlink(cmount, c_path, linkname, stx.stx_size + 1);
+
+		ldout(cct, 10) << "jni: readlink: exit ret " << ret << dendl;
+
+		if (ret < 0) {
+			delete [] linkname;
+			env->ReleaseStringUTFChars(j_path, c_path);
+			handle_error(env, ret);
+			return NULL;
+		}
+
+		/* re-stat and try again */
+		if (ret > (int)stx.stx_size) {
+			delete [] linkname;
+			continue;
+		}
+
+		linkname[ret] = '\0';
+		break;
+	}
+
+	env->ReleaseStringUTFChars(j_path, c_path);
+
+	j_linkname = env->NewStringUTF(linkname);
+	delete [] linkname;
+
+	return j_linkname;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_symlink
+ * Signature: (JLjava/lang/String;Ljava/lang/String;)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1symlink
+	(JNIEnv *env, jclass clz, jlong j_mntp, jstring j_oldpath, jstring j_newpath)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	const char *c_oldpath, *c_newpath;
+	int ret;
+
+	CHECK_ARG_NULL(j_oldpath, "@oldpath is null", -1);
+	CHECK_ARG_NULL(j_newpath, "@newpath is null", -1);
+	CHECK_MOUNTED(cmount, -1);
+
+	c_oldpath = env->GetStringUTFChars(j_oldpath, NULL);
+	if (!c_oldpath) {
+		cephThrowInternal(env, "failed to pin memory");
+		return -1;
+	}
+
+	c_newpath = env->GetStringUTFChars(j_newpath, NULL);
+	if (!c_newpath) {
+		env->ReleaseStringUTFChars(j_oldpath, c_oldpath);
+		cephThrowInternal(env, "failed to pin memory");
+		return -1;
+	}
+
+	ldout(cct, 10) << "jni: symlink: oldpath " << c_oldpath <<
+		" newpath " << c_newpath << dendl;
+
+	ret = ceph_symlink(cmount, c_oldpath, c_newpath);
+
+	ldout(cct, 10) << "jni: symlink: exit ret " << ret << dendl;
+
+	env->ReleaseStringUTFChars(j_oldpath, c_oldpath);
+	env->ReleaseStringUTFChars(j_newpath, c_newpath);
+
+	if (ret)
+		handle_error(env, ret);
+
+	return ret;
+}
+
+#define CEPH_J_CEPHSTAT_MASK (CEPH_STATX_UID|CEPH_STATX_GID|CEPH_STATX_SIZE|CEPH_STATX_BLOCKS|CEPH_STATX_MTIME|CEPH_STATX_ATIME)
+
+static void fill_cephstat(JNIEnv *env, jobject j_cephstat, struct ceph_statx *stx)
+{
+	env->SetIntField(j_cephstat, cephstat_mode_fid, stx->stx_mode);
+	env->SetIntField(j_cephstat, cephstat_uid_fid, stx->stx_uid);
+	env->SetIntField(j_cephstat, cephstat_gid_fid, stx->stx_gid);
+	env->SetLongField(j_cephstat, cephstat_size_fid, stx->stx_size);
+	env->SetLongField(j_cephstat, cephstat_blksize_fid, stx->stx_blksize);
+	env->SetLongField(j_cephstat, cephstat_blocks_fid, stx->stx_blocks);
+
+	long long time = stx->stx_mtime.tv_sec;
+	time *= 1000;
+	time += stx->stx_mtime.tv_nsec / 1000000;
+	env->SetLongField(j_cephstat, cephstat_m_time_fid, time);
+
+	time = stx->stx_atime.tv_sec;
+	time *= 1000;
+	time += stx->stx_atime.tv_nsec / 1000000;
+	env->SetLongField(j_cephstat, cephstat_a_time_fid, time);
+
+	env->SetBooleanField(j_cephstat, cephstat_is_file_fid,
+			S_ISREG(stx->stx_mode) ? JNI_TRUE : JNI_FALSE);
+
+	env->SetBooleanField(j_cephstat, cephstat_is_directory_fid,
+			S_ISDIR(stx->stx_mode) ? JNI_TRUE : JNI_FALSE);
+
+	env->SetBooleanField(j_cephstat, cephstat_is_symlink_fid,
+			S_ISLNK(stx->stx_mode) ? JNI_TRUE : JNI_FALSE);
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_lstat
+ * Signature: (JLjava/lang/String;Lcom/ceph/fs/CephStat;)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1lstat
+	(JNIEnv *env, jclass clz, jlong j_mntp, jstring j_path, jobject j_cephstat)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	const char *c_path;
+	struct ceph_statx stx;
+	int ret;
+
+	CHECK_ARG_NULL(j_path, "@path is null", -1);
+	CHECK_ARG_NULL(j_cephstat, "@stat is null", -1);
+	CHECK_MOUNTED(cmount, -1);
+
+	c_path = env->GetStringUTFChars(j_path, NULL);
+	if (!c_path) {
+		cephThrowInternal(env, "Failed to pin memory");
+		return -1;
+	}
+
+	ldout(cct, 10) << "jni: lstat: path " << c_path << dendl;
+
+	ret = ceph_statx(cmount, c_path, &stx, CEPH_J_CEPHSTAT_MASK, AT_SYMLINK_NOFOLLOW);
+
+	ldout(cct, 10) << "jni: lstat exit ret " << ret << dendl;
+
+	env->ReleaseStringUTFChars(j_path, c_path);
+
+	if (ret) {
+	    handle_error(env, ret);
+	    return ret;
+	}
+
+	fill_cephstat(env, j_cephstat, &stx);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_stat
+ * Signature: (JLjava/lang/String;Lcom/ceph/fs/CephStat;)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1stat
+	(JNIEnv *env, jclass clz, jlong j_mntp, jstring j_path, jobject j_cephstat)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	const char *c_path;
+	struct ceph_statx stx;
+	int ret;
+
+	CHECK_ARG_NULL(j_path, "@path is null", -1);
+	CHECK_ARG_NULL(j_cephstat, "@stat is null", -1);
+	CHECK_MOUNTED(cmount, -1);
+
+	c_path = env->GetStringUTFChars(j_path, NULL);
+	if (!c_path) {
+		cephThrowInternal(env, "Failed to pin memory");
+		return -1;
+	}
+
+	ldout(cct, 10) << "jni: stat: path " << c_path << dendl;
+
+	ret = ceph_statx(cmount, c_path, &stx, CEPH_J_CEPHSTAT_MASK, 0);
+
+	ldout(cct, 10) << "jni: stat exit ret " << ret << dendl;
+
+	env->ReleaseStringUTFChars(j_path, c_path);
+
+	if (ret) {
+		handle_error(env, ret);
+		return ret;
+	}
+
+	fill_cephstat(env, j_cephstat, &stx);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_setattr
+ * Signature: (JLjava/lang/String;Lcom/ceph/fs/CephStat;I)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1setattr
+	(JNIEnv *env, jclass clz, jlong j_mntp, jstring j_path, jobject j_cephstat, jint j_mask)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	const char *c_path;
+	struct ceph_statx stx;
+	int ret, mask = fixup_attr_mask(j_mask);
+
+	CHECK_ARG_NULL(j_path, "@path is null", -1);
+	CHECK_ARG_NULL(j_cephstat, "@stat is null", -1);
+	CHECK_MOUNTED(cmount, -1);
+
+	c_path = env->GetStringUTFChars(j_path, NULL);
+	if (!c_path) {
+		cephThrowInternal(env, "Failed to pin memory");
+		return -1;
+	}
+
+	memset(&stx, 0, sizeof(stx));
+
+	stx.stx_mode = env->GetIntField(j_cephstat, cephstat_mode_fid);
+	stx.stx_uid = env->GetIntField(j_cephstat, cephstat_uid_fid);
+	stx.stx_gid = env->GetIntField(j_cephstat, cephstat_gid_fid);
+	long mtime_msec = env->GetLongField(j_cephstat, cephstat_m_time_fid);
+	long atime_msec = env->GetLongField(j_cephstat, cephstat_a_time_fid);
+	stx.stx_mtime.tv_sec = mtime_msec / 1000;
+	stx.stx_mtime.tv_nsec = (mtime_msec % 1000) * 1000000;
+	stx.stx_atime.tv_sec = atime_msec / 1000;
+	stx.stx_atime.tv_nsec = (atime_msec % 1000) * 1000000;
+	
+	ldout(cct, 10) << "jni: setattr: path " << c_path << " mask " << mask << dendl;
+
+	ret = ceph_setattrx(cmount, c_path, &stx, mask, 0);
+
+	ldout(cct, 10) << "jni: setattr: exit ret " << ret << dendl;
+
+	env->ReleaseStringUTFChars(j_path, c_path);
+
+	if (ret)
+		handle_error(env, ret);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_chmod
+ * Signature: (JLjava/lang/String;I)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1chmod
+	(JNIEnv *env, jclass clz, jlong j_mntp, jstring j_path, jint j_mode)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	const char *c_path;
+	int ret;
+
+	CHECK_ARG_NULL(j_path, "@path is null", -1);
+	CHECK_MOUNTED(cmount, -1);
+
+	c_path = env->GetStringUTFChars(j_path, NULL);
+	if (!c_path) {
+		cephThrowInternal(env, "Failed to pin memory");
+		return -1;
+	}
+
+	ldout(cct, 10) << "jni: chmod: path " << c_path << " mode " << (int)j_mode << dendl;
+
+	ret = ceph_chmod(cmount, c_path, (int)j_mode);
+
+	ldout(cct, 10) << "jni: chmod: exit ret " << ret << dendl;
+
+	env->ReleaseStringUTFChars(j_path, c_path);
+
+	if (ret)
+		handle_error(env, ret);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_fchmod
+ * Signature: (JII)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1fchmod
+  (JNIEnv *env, jclass clz, jlong j_mntp, jint j_fd, jint j_mode)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	int ret;
+
+	CHECK_MOUNTED(cmount, -1);
+
+	ldout(cct, 10) << "jni: fchmod: fd " << (int)j_fd << " mode " << (int)j_mode << dendl;
+
+	ret = ceph_fchmod(cmount, (int)j_fd, (int)j_mode);
+
+	ldout(cct, 10) << "jni: fchmod: exit ret " << ret << dendl;
+
+	if (ret)
+		handle_error(env, ret);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_truncate
+ * Signature: (JLjava/lang/String;J)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1truncate
+	(JNIEnv *env, jclass clz, jlong j_mntp, jstring j_path, jlong j_size)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	const char *c_path;
+	int ret;
+
+	CHECK_ARG_NULL(j_path, "@path is null", -1);
+	CHECK_MOUNTED(cmount, -1);
+
+	c_path = env->GetStringUTFChars(j_path, NULL);
+	if (!c_path) {
+		cephThrowInternal(env, "Failed to pin memory");
+		return -1;
+	}
+
+	ldout(cct, 10) << "jni: truncate: path " << c_path << " size " << (loff_t)j_size << dendl;
+
+	ret = ceph_truncate(cmount, c_path, (loff_t)j_size);
+
+	ldout(cct, 10) << "jni: truncate: exit ret " << ret << dendl;
+
+	env->ReleaseStringUTFChars(j_path, c_path);
+
+	if (ret)
+		handle_error(env, ret);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_open
+ * Signature: (JLjava/lang/String;II)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1open
+	(JNIEnv *env, jclass clz, jlong j_mntp, jstring j_path, jint j_flags, jint j_mode)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	const char *c_path;
+	int ret, flags = fixup_open_flags(j_flags);
+
+	CHECK_ARG_NULL(j_path, "@path is null", -1);
+	CHECK_MOUNTED(cmount, -1);
+
+	c_path = env->GetStringUTFChars(j_path, NULL);
+	if (!c_path) {
+		cephThrowInternal(env, "Failed to pin memory");
+		return -1;
+	}
+
+	ldout(cct, 10) << "jni: open: path " << c_path << " flags " << flags
+		<< " mode " << (int)j_mode << dendl;
+
+	ret = ceph_open(cmount, c_path, flags, (int)j_mode);
+
+	ldout(cct, 10) << "jni: open: exit ret " << ret << dendl;
+
+	env->ReleaseStringUTFChars(j_path, c_path);
+
+	if (ret < 0)
+		handle_error(env, ret);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_open_layout
+ * Signature: (JLjava/lang/String;IIIIILjava/lang/String;)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1open_1layout
+  (JNIEnv *env, jclass clz, jlong j_mntp, jstring j_path, jint j_flags, jint j_mode,
+   jint stripe_unit, jint stripe_count, jint object_size, jstring j_data_pool)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	const char *c_path, *c_data_pool = NULL;
+	int ret, flags = fixup_open_flags(j_flags);
+
+	CHECK_ARG_NULL(j_path, "@path is null", -1);
+	CHECK_MOUNTED(cmount, -1);
+
+	c_path = env->GetStringUTFChars(j_path, NULL);
+	if (!c_path) {
+		cephThrowInternal(env, "Failed to pin memory");
+		return -1;
+	}
+
+	if (j_data_pool) {
+		c_data_pool = env->GetStringUTFChars(j_data_pool, NULL);
+		if (!c_data_pool) {
+			env->ReleaseStringUTFChars(j_path, c_path);
+			cephThrowInternal(env, "Failed to pin memory");
+			return -1;
+		}
+	}
+
+	ldout(cct, 10) << "jni: open_layout: path " << c_path << " flags " << flags
+		<< " mode " << (int)j_mode << " stripe_unit " << stripe_unit
+		<< " stripe_count " << stripe_count << " object_size " << object_size
+		<< " data_pool " << (c_data_pool ? c_data_pool : "<NULL>") << dendl;
+
+	ret = ceph_open_layout(cmount, c_path, flags, (int)j_mode,
+			(int)stripe_unit, (int)stripe_count, (int)object_size, c_data_pool);
+
+	ldout(cct, 10) << "jni: open_layout: exit ret " << ret << dendl;
+
+	env->ReleaseStringUTFChars(j_path, c_path);
+	if (j_data_pool)
+		env->ReleaseStringUTFChars(j_data_pool, c_data_pool);
+
+	if (ret < 0)
+		handle_error(env, ret);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_close
+ * Signature: (JI)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1close
+	(JNIEnv *env, jclass clz, jlong j_mntp, jint j_fd)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	int ret;
+
+	CHECK_MOUNTED(cmount, -1);
+
+	ldout(cct, 10) << "jni: close: fd " << (int)j_fd << dendl;
+
+	ret = ceph_close(cmount, (int)j_fd);
+
+	ldout(cct, 10) << "jni: close: ret " << ret << dendl;
+
+	if (ret)
+		handle_error(env, ret);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_lseek
+ * Signature: (JIJI)J
+ */
+JNIEXPORT jlong JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1lseek
+	(JNIEnv *env, jclass clz, jlong j_mntp, jint j_fd, jlong j_offset, jint j_whence)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	int whence;
+	jlong ret;
+
+	CHECK_MOUNTED(cmount, -1);
+
+	switch (j_whence) {
+	case JAVA_SEEK_SET:
+		whence = SEEK_SET;
+		break;
+	case JAVA_SEEK_CUR:
+		whence = SEEK_CUR;
+		break;
+	case JAVA_SEEK_END:
+		whence = SEEK_END;
+		break;
+	default:
+		cephThrowIllegalArg(env, "Unknown whence value");
+		return -1;
+	}
+
+	ldout(cct, 10) << "jni: lseek: fd " << (int)j_fd << " offset "
+		<< (long)j_offset << " whence " << whence << dendl;
+
+	ret = ceph_lseek(cmount, (int)j_fd, (long)j_offset, whence);
+
+	ldout(cct, 10) << "jni: lseek: exit ret " << ret << dendl;
+
+	if (ret < 0)
+		handle_error(env, ret);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_read
+ * Signature: (JI[BJJ)J
+ */
+JNIEXPORT jlong JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1read
+	(JNIEnv *env, jclass clz, jlong j_mntp, jint j_fd, jbyteArray j_buf, jlong j_size, jlong j_offset)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	jsize buf_size;
+	jbyte *c_buf;
+	long ret;
+
+	CHECK_ARG_NULL(j_buf, "@buf is null", -1);
+	CHECK_ARG_BOUNDS(j_size < 0, "@size is negative", -1);
+	CHECK_MOUNTED(cmount, -1);
+
+	buf_size = env->GetArrayLength(j_buf);
+	CHECK_ARG_BOUNDS(j_size > buf_size, "@size > @buf.length", -1);
+
+	c_buf = env->GetByteArrayElements(j_buf, NULL);
+	if (!c_buf) {
+		cephThrowInternal(env, "failed to pin memory");
+		return -1;
+	}
+
+	ldout(cct, 10) << "jni: read: fd " << (int)j_fd << " len " << (long)j_size <<
+		" offset " << (long)j_offset << dendl;
+
+	ret = ceph_read(cmount, (int)j_fd, (char*)c_buf, (long)j_size, (long)j_offset);
+
+	ldout(cct, 10) << "jni: read: exit ret " << ret << dendl;
+
+	if (ret < 0)
+		handle_error(env, (int)ret);
+	else
+		env->ReleaseByteArrayElements(j_buf, c_buf, 0);
+
+	return (jlong)ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_write
+ * Signature: (JI[BJJ)J
+ */
+JNIEXPORT jlong JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1write
+	(JNIEnv *env, jclass clz, jlong j_mntp, jint j_fd, jbyteArray j_buf, jlong j_size, jlong j_offset)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	jsize buf_size;
+	jbyte *c_buf;
+	long ret;
+
+	CHECK_ARG_NULL(j_buf, "@buf is null", -1);
+	CHECK_ARG_BOUNDS(j_size < 0, "@size is negative", -1);
+	CHECK_MOUNTED(cmount, -1);
+
+	buf_size = env->GetArrayLength(j_buf);
+	CHECK_ARG_BOUNDS(j_size > buf_size, "@size > @buf.length", -1);
+
+	c_buf = env->GetByteArrayElements(j_buf, NULL);
+	if (!c_buf) {
+		cephThrowInternal(env, "failed to pin memory");
+		return -1;
+	}
+
+	ldout(cct, 10) << "jni: write: fd " << (int)j_fd << " len " << (long)j_size <<
+		" offset " << (long)j_offset << dendl;
+
+	ret = ceph_write(cmount, (int)j_fd, (char*)c_buf, (long)j_size, (long)j_offset);
+
+	ldout(cct, 10) << "jni: write: exit ret " << ret << dendl;
+
+	if (ret < 0)
+		handle_error(env, (int)ret);
+	else
+		env->ReleaseByteArrayElements(j_buf, c_buf, JNI_ABORT);
+
+	return ret;
+}
+
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_ftruncate
+ * Signature: (JIJ)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1ftruncate
+	(JNIEnv *env, jclass clz, jlong j_mntp, jint j_fd, jlong j_size)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	int ret;
+
+	CHECK_MOUNTED(cmount, -1);
+
+	ldout(cct, 10) << "jni: ftruncate: fd " << (int)j_fd <<
+		" size " << (loff_t)j_size << dendl;
+
+	ret = ceph_ftruncate(cmount, (int)j_fd, (loff_t)j_size);
+
+	ldout(cct, 10) << "jni: ftruncate: exit ret " << ret << dendl;
+
+	if (ret)
+		handle_error(env, ret);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_fsync
+ * Signature: (JIZ)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1fsync
+	(JNIEnv *env, jclass clz, jlong j_mntp, jint j_fd, jboolean j_dataonly)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	int ret;
+
+	ldout(cct, 10) << "jni: fsync: fd " << (int)j_fd <<
+		" dataonly " << (j_dataonly ? 1 : 0) << dendl;
+
+	ret = ceph_fsync(cmount, (int)j_fd, j_dataonly ? 1 : 0);
+
+	ldout(cct, 10) << "jni: fsync: exit ret " << ret << dendl;
+
+	if (ret)
+		handle_error(env, ret);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_flock
+ * Signature: (JIZ)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1flock
+	(JNIEnv *env, jclass clz, jlong j_mntp, jint j_fd, jint j_operation, jlong j_owner)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	int ret;
+
+	ldout(cct, 10) << "jni: flock: fd " << (int)j_fd <<
+		" operation " << j_operation << " owner " << j_owner << dendl;
+
+	int operation = 0;
+
+#define MAP_FLOCK_FLAG(JNI_MASK, NATIVE_MASK) do {	\
+	if ((j_operation & JNI_MASK) != 0) {		\
+		operation |= NATIVE_MASK; 		\
+		j_operation &= ~JNI_MASK;		\
+	} 						\
+	} while(0)
+	MAP_FLOCK_FLAG(JAVA_LOCK_SH, LOCK_SH);
+	MAP_FLOCK_FLAG(JAVA_LOCK_EX, LOCK_EX);
+	MAP_FLOCK_FLAG(JAVA_LOCK_NB, LOCK_NB);
+	MAP_FLOCK_FLAG(JAVA_LOCK_UN, LOCK_UN);
+	if (j_operation != 0) {
+		cephThrowIllegalArg(env, "flock flags");
+		return -EINVAL;
+	}
+#undef MAP_FLOCK_FLAG
+
+	ret = ceph_flock(cmount, (int)j_fd, operation, (uint64_t) j_owner);
+
+	ldout(cct, 10) << "jni: flock: exit ret " << ret << dendl;
+
+	if (ret)
+		handle_error(env, ret);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_fstat
+ * Signature: (JILcom/ceph/fs/CephStat;)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1fstat
+	(JNIEnv *env, jclass clz, jlong j_mntp, jint j_fd, jobject j_cephstat)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	struct ceph_statx stx;
+	int ret;
+
+	CHECK_ARG_NULL(j_cephstat, "@stat is null", -1);
+	CHECK_MOUNTED(cmount, -1);
+
+	ldout(cct, 10) << "jni: fstat: fd " << (int)j_fd << dendl;
+
+	ret = ceph_fstatx(cmount, (int)j_fd, &stx, CEPH_J_CEPHSTAT_MASK, 0);
+
+	ldout(cct, 10) << "jni: fstat exit ret " << ret << dendl;
+
+	if (ret) {
+		handle_error(env, ret);
+		return ret;
+	}
+
+	fill_cephstat(env, j_cephstat, &stx);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_sync_fs
+ * Signature: (J)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1sync_1fs
+	(JNIEnv *env, jclass clz, jlong j_mntp)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	int ret;
+
+	ldout(cct, 10) << "jni: sync_fs: enter" << dendl;
+
+	ret = ceph_sync_fs(cmount);
+
+	ldout(cct, 10) << "jni: sync_fs: exit ret " << ret << dendl;
+
+	if (ret)
+		handle_error(env, ret);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_getxattr
+ * Signature: (JLjava/lang/String;Ljava/lang/String;[B)J
+ */
+JNIEXPORT jlong JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1getxattr
+	(JNIEnv *env, jclass clz, jlong j_mntp, jstring j_path, jstring j_name, jbyteArray j_buf)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	const char *c_path;
+	const char *c_name;
+	jsize buf_size;
+	jbyte *c_buf = NULL; /* please gcc with goto */
+	long ret;
+
+	CHECK_ARG_NULL(j_path, "@path is null", -1);
+	CHECK_ARG_NULL(j_name, "@name is null", -1);
+	CHECK_MOUNTED(cmount, -1);
+
+	c_path = env->GetStringUTFChars(j_path, NULL);
+	if (!c_path) {
+		cephThrowInternal(env, "Failed to pin memory");
+		return -1;
+	}
+
+	c_name = env->GetStringUTFChars(j_name, NULL);
+	if (!c_name) {
+		env->ReleaseStringUTFChars(j_path, c_path);
+		cephThrowInternal(env, "Failed to pin memory");
+		return -1;
+	}
+
+	/* just lookup the size if buf is null */
+	if (!j_buf) {
+		buf_size = 0;
+		goto do_getxattr;
+	}
+
+	c_buf = env->GetByteArrayElements(j_buf, NULL);
+	if (!c_buf) {
+		env->ReleaseStringUTFChars(j_path, c_path);
+		env->ReleaseStringUTFChars(j_name, c_name);
+		cephThrowInternal(env, "failed to pin memory");
+		return -1;
+	}
+
+	buf_size = env->GetArrayLength(j_buf);
+
+do_getxattr:
+
+	ldout(cct, 10) << "jni: getxattr: path " << c_path << " name " << c_name <<
+		" len " << buf_size << dendl;
+
+	ret = ceph_getxattr(cmount, c_path, c_name, c_buf, buf_size);
+	if (ret == -ERANGE)
+		ret = ceph_getxattr(cmount, c_path, c_name, c_buf, 0);
+
+	ldout(cct, 10) << "jni: getxattr: exit ret " << ret << dendl;
+
+	env->ReleaseStringUTFChars(j_path, c_path);
+	env->ReleaseStringUTFChars(j_name, c_name);
+	if (j_buf)
+		env->ReleaseByteArrayElements(j_buf, c_buf, 0);
+
+	if (ret < 0)
+		handle_error(env, (int)ret);
+
+	return (jlong)ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_lgetxattr
+ * Signature: (JLjava/lang/String;Ljava/lang/String;[B)I
+ */
+JNIEXPORT jlong JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1lgetxattr
+	(JNIEnv *env, jclass clz, jlong j_mntp, jstring j_path, jstring j_name, jbyteArray j_buf)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	const char *c_path;
+	const char *c_name;
+	jsize buf_size;
+	jbyte *c_buf = NULL; /* please gcc with goto */
+	long ret;
+
+	CHECK_ARG_NULL(j_path, "@path is null", -1);
+	CHECK_ARG_NULL(j_name, "@name is null", -1);
+	CHECK_MOUNTED(cmount, -1);
+
+	c_path = env->GetStringUTFChars(j_path, NULL);
+	if (!c_path) {
+		cephThrowInternal(env, "Failed to pin memory");
+		return -1;
+	}
+
+	c_name = env->GetStringUTFChars(j_name, NULL);
+	if (!c_name) {
+		env->ReleaseStringUTFChars(j_path, c_path);
+		cephThrowInternal(env, "Failed to pin memory");
+		return -1;
+	}
+
+	/* just lookup the size if buf is null */
+	if (!j_buf) {
+		buf_size = 0;
+		goto do_lgetxattr;
+	}
+
+	c_buf = env->GetByteArrayElements(j_buf, NULL);
+	if (!c_buf) {
+		env->ReleaseStringUTFChars(j_path, c_path);
+		env->ReleaseStringUTFChars(j_name, c_name);
+		cephThrowInternal(env, "failed to pin memory");
+		return -1;
+	}
+
+	buf_size = env->GetArrayLength(j_buf);
+
+do_lgetxattr:
+
+	ldout(cct, 10) << "jni: lgetxattr: path " << c_path << " name " << c_name <<
+		" len " << buf_size << dendl;
+
+	ret = ceph_lgetxattr(cmount, c_path, c_name, c_buf, buf_size);
+	if (ret == -ERANGE)
+		ret = ceph_lgetxattr(cmount, c_path, c_name, c_buf, 0);
+
+	ldout(cct, 10) << "jni: lgetxattr: exit ret " << ret << dendl;
+
+	env->ReleaseStringUTFChars(j_path, c_path);
+	env->ReleaseStringUTFChars(j_name, c_name);
+	if (j_buf)
+		env->ReleaseByteArrayElements(j_buf, c_buf, 0);
+
+	if (ret < 0)
+		handle_error(env, (int)ret);
+
+	return (jlong)ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_listxattr
+ * Signature: (JLjava/lang/String;)[Ljava/lang/String;
+ */
+JNIEXPORT jobjectArray JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1listxattr
+	(JNIEnv *env, jclass clz, jlong j_mntp, jstring j_path)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	jobjectArray xattrlist;
+	const char *c_path;
+	string *ent;
+	jstring name;
+	list<string>::iterator it;
+	list<string> contents;
+	int ret, buflen, bufpos, i;
+	char *buf;
+
+	CHECK_ARG_NULL(j_path, "@path is null", NULL);
+	CHECK_MOUNTED(cmount, NULL);
+
+	c_path = env->GetStringUTFChars(j_path, NULL);
+	if (!c_path) {
+		cephThrowInternal(env, "Failed to pin memory");
+		return NULL;
+	}
+
+	buflen = 1024;
+	buf = new (std::nothrow) char[buflen];
+	if (!buf) {
+		cephThrowOutOfMemory(env, "head allocation failed");
+		goto out;
+	}
+
+	while (1) {
+		ldout(cct, 10) << "jni: listxattr: path " << c_path << " len " << buflen << dendl;
+		ret = ceph_listxattr(cmount, c_path, buf, buflen);
+		if (ret == -ERANGE) {
+			delete [] buf;
+			buflen *= 2;
+			buf = new (std::nothrow) char[buflen];
+			if (!buf)  {
+				cephThrowOutOfMemory(env, "heap allocation failed");
+				goto out;
+			}
+			continue;
+		}
+		break;
+	}
+
+	ldout(cct, 10) << "jni: listxattr: ret " << ret << dendl;
+
+	if (ret < 0) {
+		delete [] buf;
+		handle_error(env, ret);
+		goto out;
+	}
+
+	bufpos = 0;
+	while (bufpos < ret) {
+		ent = new (std::nothrow) string(buf + bufpos);
+		if (!ent) {
+			delete [] buf;
+			cephThrowOutOfMemory(env, "heap allocation failed");
+			goto out;
+		}
+		contents.push_back(*ent);
+		bufpos += ent->size() + 1;
+		delete ent;
+	}
+
+	delete [] buf;
+
+	xattrlist = env->NewObjectArray(contents.size(), env->FindClass("java/lang/String"), NULL);
+	if (!xattrlist)
+		goto out;
+
+	for (i = 0, it = contents.begin(); it != contents.end(); ++it) {
+		name = env->NewStringUTF(it->c_str());
+		if (!name)
+			goto out;
+		env->SetObjectArrayElement(xattrlist, i++, name);
+		if (env->ExceptionOccurred())
+			goto out;
+		env->DeleteLocalRef(name);
+	}
+
+	env->ReleaseStringUTFChars(j_path, c_path);
+	return xattrlist;
+
+out:
+	env->ReleaseStringUTFChars(j_path, c_path);
+	return NULL;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_llistxattr
+ * Signature: (JLjava/lang/String;)[Ljava/lang/String;
+ */
+JNIEXPORT jobjectArray JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1llistxattr
+	(JNIEnv *env, jclass clz, jlong j_mntp, jstring j_path)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	jobjectArray xattrlist;
+	const char *c_path;
+	string *ent;
+	jstring name;
+	list<string>::iterator it;
+	list<string> contents;
+	int ret, buflen, bufpos, i;
+	char *buf;
+
+	CHECK_ARG_NULL(j_path, "@path is null", NULL);
+	CHECK_MOUNTED(cmount, NULL);
+
+	c_path = env->GetStringUTFChars(j_path, NULL);
+	if (!c_path) {
+		cephThrowInternal(env, "Failed to pin memory");
+		return NULL;
+	}
+
+	buflen = 1024;
+	buf = new (std::nothrow) char[buflen];
+	if (!buf) {
+		cephThrowOutOfMemory(env, "head allocation failed");
+		goto out;
+	}
+
+	while (1) {
+		ldout(cct, 10) << "jni: llistxattr: path " << c_path << " len " << buflen << dendl;
+		ret = ceph_llistxattr(cmount, c_path, buf, buflen);
+		if (ret == -ERANGE) {
+			delete [] buf;
+			buflen *= 2;
+			buf = new (std::nothrow) char[buflen];
+			if (!buf)  {
+				cephThrowOutOfMemory(env, "heap allocation failed");
+				goto out;
+			}
+			continue;
+		}
+		break;
+	}
+
+	ldout(cct, 10) << "jni: llistxattr: ret " << ret << dendl;
+
+	if (ret < 0) {
+		delete [] buf;
+		handle_error(env, ret);
+		goto out;
+	}
+
+	bufpos = 0;
+	while (bufpos < ret) {
+		ent = new (std::nothrow) string(buf + bufpos);
+		if (!ent) {
+			delete [] buf;
+			cephThrowOutOfMemory(env, "heap allocation failed");
+			goto out;
+		}
+		contents.push_back(*ent);
+		bufpos += ent->size() + 1;
+		delete ent;
+	}
+
+	delete [] buf;
+
+	xattrlist = env->NewObjectArray(contents.size(), env->FindClass("java/lang/String"), NULL);
+	if (!xattrlist)
+		goto out;
+
+	for (i = 0, it = contents.begin(); it != contents.end(); ++it) {
+		name = env->NewStringUTF(it->c_str());
+		if (!name)
+			goto out;
+		env->SetObjectArrayElement(xattrlist, i++, name);
+		if (env->ExceptionOccurred())
+			goto out;
+		env->DeleteLocalRef(name);
+	}
+
+	env->ReleaseStringUTFChars(j_path, c_path);
+	return xattrlist;
+
+out:
+	env->ReleaseStringUTFChars(j_path, c_path);
+	return NULL;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_removexattr
+ * Signature: (JLjava/lang/String;Ljava/lang/String;)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1removexattr
+	(JNIEnv *env, jclass clz, jlong j_mntp, jstring j_path, jstring j_name)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	const char *c_path;
+	const char *c_name;
+	int ret;
+
+	CHECK_ARG_NULL(j_path, "@path is null", -1);
+	CHECK_ARG_NULL(j_name, "@name is null", -1);
+	CHECK_MOUNTED(cmount, -1);
+
+	c_path = env->GetStringUTFChars(j_path, NULL);
+	if (!c_path) {
+		cephThrowInternal(env, "Failed to pin memory");
+		return -1;
+	}
+
+	c_name = env->GetStringUTFChars(j_name, NULL);
+	if (!c_name) {
+		env->ReleaseStringUTFChars(j_path, c_path);
+		cephThrowInternal(env, "Failed to pin memory");
+		return -1;
+	}
+
+	ldout(cct, 10) << "jni: removexattr: path " << c_path << " name " << c_name << dendl;
+
+	ret = ceph_removexattr(cmount, c_path, c_name);
+
+	ldout(cct, 10) << "jni: removexattr: exit ret " << ret << dendl;
+
+	env->ReleaseStringUTFChars(j_path, c_path);
+	env->ReleaseStringUTFChars(j_name, c_name);
+
+	if (ret)
+		handle_error(env, ret);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_lremovexattr
+ * Signature: (JLjava/lang/String;Ljava/lang/String;)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1lremovexattr
+	(JNIEnv *env, jclass clz, jlong j_mntp, jstring j_path, jstring j_name)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	const char *c_path;
+	const char *c_name;
+	int ret;
+
+	CHECK_ARG_NULL(j_path, "@path is null", -1);
+	CHECK_ARG_NULL(j_name, "@name is null", -1);
+	CHECK_MOUNTED(cmount, -1);
+
+	c_path = env->GetStringUTFChars(j_path, NULL);
+	if (!c_path) {
+		cephThrowInternal(env, "Failed to pin memory");
+		return -1;
+	}
+
+	c_name = env->GetStringUTFChars(j_name, NULL);
+	if (!c_name) {
+		env->ReleaseStringUTFChars(j_path, c_path);
+		cephThrowInternal(env, "Failed to pin memory");
+		return -1;
+	}
+
+	ldout(cct, 10) << "jni: lremovexattr: path " << c_path << " name " << c_name << dendl;
+
+	ret = ceph_lremovexattr(cmount, c_path, c_name);
+
+	ldout(cct, 10) << "jni: lremovexattr: exit ret " << ret << dendl;
+
+	env->ReleaseStringUTFChars(j_path, c_path);
+	env->ReleaseStringUTFChars(j_name, c_name);
+
+	if (ret)
+		handle_error(env, ret);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_setxattr
+ * Signature: (JLjava/lang/String;Ljava/lang/String;[BJI)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1setxattr
+	(JNIEnv *env, jclass clz, jlong j_mntp, jstring j_path, jstring j_name,
+	 jbyteArray j_buf, jlong j_size, jint j_flags)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	const char *c_path;
+	const char *c_name;
+	jsize buf_size;
+	jbyte *c_buf;
+	int ret, flags;
+
+	CHECK_ARG_NULL(j_path, "@path is null", -1);
+	CHECK_ARG_NULL(j_name, "@name is null", -1);
+	CHECK_ARG_NULL(j_buf, "@buf is null", -1);
+	CHECK_ARG_BOUNDS(j_size < 0, "@size is negative", -1);
+	CHECK_MOUNTED(cmount, -1);
+
+	buf_size = env->GetArrayLength(j_buf);
+	CHECK_ARG_BOUNDS(j_size > buf_size, "@size > @buf.length", -1);
+
+	c_path = env->GetStringUTFChars(j_path, NULL);
+	if (!c_path) {
+		cephThrowInternal(env, "Failed to pin memory");
+		return -1;
+	}
+
+	c_name = env->GetStringUTFChars(j_name, NULL);
+	if (!c_name) {
+		env->ReleaseStringUTFChars(j_path, c_path);
+		cephThrowInternal(env, "Failed to pin memory");
+		return -1;
+	}
+
+	c_buf = env->GetByteArrayElements(j_buf, NULL);
+	if (!c_buf) {
+		env->ReleaseStringUTFChars(j_path, c_path);
+		env->ReleaseStringUTFChars(j_name, c_name);
+		cephThrowInternal(env, "failed to pin memory");
+		return -1;
+	}
+
+	switch (j_flags) {
+	case JAVA_XATTR_CREATE:
+		flags = CEPH_XATTR_CREATE;
+		break;
+	case JAVA_XATTR_REPLACE:
+		flags = CEPH_XATTR_REPLACE;
+		break;
+	case JAVA_XATTR_NONE:
+		flags = 0;
+		break;
+	default:
+		env->ReleaseStringUTFChars(j_path, c_path);
+		env->ReleaseStringUTFChars(j_name, c_name);
+		env->ReleaseByteArrayElements(j_buf, c_buf, JNI_ABORT);
+		cephThrowIllegalArg(env, "setxattr flag");
+		return -1;
+	}
+
+	ldout(cct, 10) << "jni: setxattr: path " << c_path << " name " << c_name
+		<< " len " << j_size << " flags " << flags << dendl;
+
+	ret = ceph_setxattr(cmount, c_path, c_name, c_buf, j_size, flags);
+
+	ldout(cct, 10) << "jni: setxattr: exit ret " << ret << dendl;
+
+	env->ReleaseStringUTFChars(j_path, c_path);
+	env->ReleaseStringUTFChars(j_name, c_name);
+	env->ReleaseByteArrayElements(j_buf, c_buf, JNI_ABORT);
+
+	if (ret)
+		handle_error(env, ret);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_lsetxattr
+ * Signature: (JLjava/lang/String;Ljava/lang/String;[BJI)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1lsetxattr
+	(JNIEnv *env, jclass clz, jlong j_mntp, jstring j_path, jstring j_name,
+	 jbyteArray j_buf, jlong j_size, jint j_flags)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	const char *c_path;
+	const char *c_name;
+	jsize buf_size;
+	jbyte *c_buf;
+	int ret, flags;
+
+	CHECK_ARG_NULL(j_path, "@path is null", -1);
+	CHECK_ARG_NULL(j_name, "@name is null", -1);
+	CHECK_ARG_NULL(j_buf, "@buf is null", -1);
+	CHECK_ARG_BOUNDS(j_size < 0, "@size is negative", -1);
+	CHECK_MOUNTED(cmount, -1);
+
+	buf_size = env->GetArrayLength(j_buf);
+	CHECK_ARG_BOUNDS(j_size > buf_size, "@size > @buf.length", -1);
+
+	c_path = env->GetStringUTFChars(j_path, NULL);
+	if (!c_path) {
+		cephThrowInternal(env, "Failed to pin memory");
+		return -1;
+	}
+
+	c_name = env->GetStringUTFChars(j_name, NULL);
+	if (!c_name) {
+		env->ReleaseStringUTFChars(j_path, c_path);
+		cephThrowInternal(env, "Failed to pin memory");
+		return -1;
+	}
+
+	c_buf = env->GetByteArrayElements(j_buf, NULL);
+	if (!c_buf) {
+		env->ReleaseStringUTFChars(j_path, c_path);
+		env->ReleaseStringUTFChars(j_name, c_name);
+		cephThrowInternal(env, "failed to pin memory");
+		return -1;
+	}
+
+	switch (j_flags) {
+	case JAVA_XATTR_CREATE:
+		flags = CEPH_XATTR_CREATE;
+		break;
+	case JAVA_XATTR_REPLACE:
+		flags = CEPH_XATTR_REPLACE;
+		break;
+	case JAVA_XATTR_NONE:
+		flags = 0;
+		break;
+	default:
+		env->ReleaseStringUTFChars(j_path, c_path);
+		env->ReleaseStringUTFChars(j_name, c_name);
+		env->ReleaseByteArrayElements(j_buf, c_buf, JNI_ABORT);
+		cephThrowIllegalArg(env, "lsetxattr flag");
+		return -1;
+	}
+
+	ldout(cct, 10) << "jni: lsetxattr: path " << c_path << " name " << c_name
+		<< " len " << j_size << " flags " << flags << dendl;
+
+	ret = ceph_lsetxattr(cmount, c_path, c_name, c_buf, j_size, flags);
+
+	ldout(cct, 10) << "jni: lsetxattr: exit ret " << ret << dendl;
+
+	env->ReleaseStringUTFChars(j_path, c_path);
+	env->ReleaseStringUTFChars(j_name, c_name);
+	env->ReleaseByteArrayElements(j_buf, c_buf, JNI_ABORT);
+
+	if (ret)
+		handle_error(env, ret);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_get_file_stripe_unit
+ * Signature: (JI)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1get_1file_1stripe_1unit
+	(JNIEnv *env, jclass clz, jlong j_mntp, jint j_fd)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	int ret;
+
+	CHECK_MOUNTED(cmount, -1);
+
+	ldout(cct, 10) << "jni: get_file_stripe_unit: fd " << (int)j_fd << dendl;
+
+	ret = ceph_get_file_stripe_unit(cmount, (int)j_fd);
+
+	ldout(cct, 10) << "jni: get_file_stripe_unit: exit ret " << ret << dendl;
+
+	if (ret < 0)
+		handle_error(env, ret);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_get_file_replication
+ * Signature: (JI)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1get_1file_1replication
+	(JNIEnv *env, jclass clz, jlong j_mntp, jint j_fd)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	int ret;
+
+	CHECK_MOUNTED(cmount, -1);
+
+	ldout(cct, 10) << "jni: get_file_replication: fd " << (int)j_fd << dendl;
+
+	ret = ceph_get_file_replication(cmount, (int)j_fd);
+
+	ldout(cct, 10) << "jni: get_file_replication: exit ret " << ret << dendl;
+
+	if (ret < 0)
+		handle_error(env, ret);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_get_file_pool_name
+ * Signature: (JI)Ljava/lang/String;
+ */
+JNIEXPORT jstring JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1get_1file_1pool_1name
+  (JNIEnv *env, jclass clz, jlong j_mntp, jint j_fd)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	jstring pool = NULL;
+	int ret, buflen = 0;
+	char *buf = NULL;
+
+	CHECK_MOUNTED(cmount, NULL);
+
+	ldout(cct, 10) << "jni: get_file_pool_name: fd " << (int)j_fd << dendl;
+
+	for (;;) {
+		/* get pool name length (len==0) */
+		ret = ceph_get_file_pool_name(cmount, (int)j_fd, NULL, 0);
+		if (ret < 0)
+			break;
+
+		/* allocate buffer */
+		if (buf)
+			delete [] buf;
+		buflen = ret;
+		buf = new (std::nothrow) char[buflen+1]; /* +1 for '\0' */
+		if (!buf) {
+			cephThrowOutOfMemory(env, "head allocation failed");
+			goto out;
+		}
+		memset(buf, 0, (buflen+1)*sizeof(*buf));
+
+		/* handle zero-length pool name!? */
+		if (buflen == 0)
+			break;
+
+		/* fill buffer */
+		ret = ceph_get_file_pool_name(cmount, (int)j_fd, buf, buflen);
+		if (ret == -ERANGE) /* size changed! */
+			continue;
+		else
+			break;
+	}
+
+	ldout(cct, 10) << "jni: get_file_pool_name: ret " << ret << dendl;
+
+	if (ret < 0)
+		handle_error(env, ret);
+	else
+		pool = env->NewStringUTF(buf);
+
+out:
+	if (buf)
+	delete [] buf;
+
+	return pool;
+}
+
+/**
+ * Class: com_ceph_fs_CephMount
+ * Method: native_ceph_get_default_data_pool_name
+ * Signature: (J)Ljava/lang/String;
+ */
+JNIEXPORT jstring JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1get_1default_1data_1pool_1name
+  (JNIEnv *env, jclass clz, jlong j_mntp)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	jstring pool = NULL;
+	int ret, buflen = 0;
+	char *buf = NULL;
+        
+	CHECK_MOUNTED(cmount, NULL);
+	 
+	ldout(cct, 10) << "jni: get_default_data_pool_name" << dendl;
+
+	ret = ceph_get_default_data_pool_name(cmount, NULL, 0);
+	if (ret < 0)
+		goto out;
+	buflen = ret;
+	buf = new (std::nothrow) char[buflen+1]; /* +1 for '\0' */
+	if (!buf) {
+		cephThrowOutOfMemory(env, "head allocation failed");
+		goto out;
+	}
+	memset(buf, 0, (buflen+1)*sizeof(*buf));
+	ret = ceph_get_default_data_pool_name(cmount, buf, buflen);
+	
+	ldout(cct, 10) << "jni: get_default_data_pool_name: ret " << ret << dendl;
+	
+	if (ret < 0)
+		handle_error(env, ret);
+	else
+		pool = env->NewStringUTF(buf);
+
+out:
+	if (buf)
+	delete [] buf;
+
+	return pool;        
+}
+
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_localize_reads
+ * Signature: (JZ)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1localize_1reads
+	(JNIEnv *env, jclass clz, jlong j_mntp, jboolean j_on)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	int ret, val = j_on ? 1 : 0;
+
+	CHECK_MOUNTED(cmount, -1);
+
+	ldout(cct, 10) << "jni: localize_reads: val " << val << dendl;
+
+	ret = ceph_localize_reads(cmount, val);
+
+	ldout(cct, 10) << "jni: localize_reads: exit ret " << ret << dendl;
+
+	if (ret)
+		handle_error(env, ret);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_get_stripe_unit_granularity
+ * Signature: (J)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1get_1stripe_1unit_1granularity
+	(JNIEnv *env, jclass clz, jlong j_mntp)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	int ret;
+
+	CHECK_MOUNTED(cmount, -1);
+
+	ldout(cct, 10) << "jni: get_stripe_unit_granularity" << dendl;
+
+	ret = ceph_get_stripe_unit_granularity(cmount);
+
+	ldout(cct, 10) << "jni: get_stripe_unit_granularity: exit ret " << ret << dendl;
+
+	if (ret < 0)
+		handle_error(env, ret);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_get_pool_id
+ * Signature: (JLjava/lang/String;)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1get_1pool_1id
+  (JNIEnv *env, jclass clz, jlong j_mntp, jstring jname)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	const char *c_name;
+	int ret;
+
+	CHECK_MOUNTED(cmount, -1);
+	CHECK_ARG_NULL(jname, "@name is null", -1);
+
+	c_name = env->GetStringUTFChars(jname, NULL);
+	if (!c_name) {
+		cephThrowInternal(env, "failed to pin memory");
+		return -1;
+	}
+
+	ldout(cct, 10) << "jni: get_pool_id: name " << c_name << dendl;
+
+	ret = ceph_get_pool_id(cmount, c_name);
+	if (ret < 0)
+		handle_error(env, ret);
+
+	ldout(cct, 10) << "jni: get_pool_id: ret " << ret << dendl;
+
+	env->ReleaseStringUTFChars(jname, c_name);
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_get_pool_replication
+ * Signature: (JI)I
+ */
+JNIEXPORT jint JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1get_1pool_1replication
+  (JNIEnv *env, jclass clz, jlong j_mntp, jint jpoolid)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+	int ret;
+
+	CHECK_MOUNTED(cmount, -1);
+
+	ldout(cct, 10) << "jni: get_pool_replication: poolid " << jpoolid << dendl;
+
+	ret = ceph_get_pool_replication(cmount, jpoolid);
+	if (ret < 0)
+		handle_error(env, ret);
+
+	ldout(cct, 10) << "jni: get_pool_replication: ret " << ret << dendl;
+
+	return ret;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_get_file_extent_osds
+ * Signature: (JIJ)Lcom/ceph/fs/CephFileExtent;
+ */
+JNIEXPORT jobject JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1get_1file_1extent_1osds
+  (JNIEnv *env, jclass clz, jlong mntp, jint fd, jlong off)
+{
+  struct ceph_mount_info *cmount = get_ceph_mount(mntp);
+  CephContext *cct = ceph_get_mount_context(cmount);
+  jobject extent = NULL;
+  int ret, nosds, *osds = NULL;
+  jintArray osd_array;
+  loff_t len;
+
+	CHECK_MOUNTED(cmount, NULL);
+
+	ldout(cct, 10) << "jni: get_file_extent_osds: fd " << fd << " off " << off << dendl;
+
+  for (;;) {
+    /* get pg size */
+    ret = ceph_get_file_extent_osds(cmount, fd, off, NULL, NULL, 0);
+    if (ret < 0)
+      break;
+
+    /* alloc osd id array */
+    if (osds)
+      delete [] osds;
+    nosds = ret;
+    osds = new int[nosds];
+
+    /* get osd ids */
+    ret = ceph_get_file_extent_osds(cmount, fd, off, &len, osds, nosds);
+    if (ret == -ERANGE)
+      continue;
+    else
+      break;
+  }
+
+	ldout(cct, 10) << "jni: get_file_extent_osds: ret " << ret << dendl;
+
+  if (ret < 0) {
+    handle_error(env, ret);
+    goto out;
+  }
+
+  nosds = ret;
+
+  osd_array = env->NewIntArray(nosds);
+  if (!osd_array)
+    goto out;
+
+  env->SetIntArrayRegion(osd_array, 0, nosds, osds);
+  if (env->ExceptionOccurred())
+    goto out;
+
+  extent = env->NewObject(cephfileextent_cls, cephfileextent_ctor_fid, off, len, osd_array);
+  if (!extent)
+    goto out;
+
+out:
+  if (osds)
+    delete [] osds;
+
+  return extent;
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_get_osd_crush_location
+ * Signature: (JI)[Ljava/lang/String;
+ */
+JNIEXPORT jobjectArray JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1get_1osd_1crush_1location
+  (JNIEnv *env, jclass clz, jlong j_mntp, jint osdid)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+  jobjectArray path = NULL;
+  vector<string> str_path;
+	int ret, bufpos, buflen = 0;
+  char *buf = NULL;
+
+	CHECK_MOUNTED(cmount, NULL);
+
+  ldout(cct, 10) << "jni: osd loc: osd " << osdid << dendl;
+
+  for (;;) {
+    /* get length of the location path */
+    ret = ceph_get_osd_crush_location(cmount, osdid, NULL, 0);
+    if (ret < 0)
+      break;
+
+    /* alloc path buffer */
+    if (buf)
+      delete [] buf;
+    buflen = ret;
+    buf = new char[buflen+1];
+    memset(buf, 0, buflen*sizeof(*buf));
+
+    /* empty path */
+    if (buflen == 0)
+      break;
+
+    /* get the path */
+    ret = ceph_get_osd_crush_location(cmount, osdid, buf, buflen);
+    if (ret == -ERANGE)
+      continue;
+    else
+      break;
+  }
+
+  ldout(cct, 10) << "jni: osd loc: osd " << osdid << " ret " << ret << dendl;
+
+  if (ret < 0) {
+    handle_error(env, ret);
+    goto out;
+  }
+
+  bufpos = 0;
+  while (bufpos < ret) {
+    string type(buf + bufpos);
+    bufpos += type.size() + 1;
+    string name(buf + bufpos);
+    bufpos += name.size() + 1;
+    str_path.push_back(type);
+    str_path.push_back(name);
+  }
+
+  path = env->NewObjectArray(str_path.size(), env->FindClass("java/lang/String"), NULL);
+  if (!path)
+    goto out;
+
+  for (unsigned i = 0; i < str_path.size(); i++) {
+    jstring ent = env->NewStringUTF(str_path[i].c_str());
+    if (!ent)
+      goto out;
+    env->SetObjectArrayElement(path, i, ent);
+    if (env->ExceptionOccurred())
+      goto out;
+    env->DeleteLocalRef(ent);
+  }
+
+out:
+  if (buf)
+    delete [] buf;
+
+  return path;
+}
+
+/*
+ * sockaddrToInetAddress uses with the following license, and is adapted for
+ * use in this project by using Ceph JNI exception utilities.
+ *
+ * ----
+ *
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+jobject sockaddrToInetAddress(JNIEnv* env, const sockaddr_storage& ss, jint* port) {
+    // Convert IPv4-mapped IPv6 addresses to IPv4 addresses.
+    // The RI states "Java will never return an IPv4-mapped address".
+    const sockaddr_in6& sin6 = reinterpret_cast<const sockaddr_in6&>(ss);
+    if (ss.ss_family == AF_INET6 && IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
+        // Copy the IPv6 address into the temporary sockaddr_storage.
+        sockaddr_storage tmp;
+        memset(&tmp, 0, sizeof(tmp));
+        memcpy(&tmp, &ss, sizeof(sockaddr_in6));
+        // Unmap it into an IPv4 address.
+        sockaddr_in& sin = reinterpret_cast<sockaddr_in&>(tmp);
+        sin.sin_family = AF_INET;
+        sin.sin_port = sin6.sin6_port;
+        memcpy(&sin.sin_addr.s_addr, &sin6.sin6_addr.s6_addr[12], 4);
+        // Do the regular conversion using the unmapped address.
+        return sockaddrToInetAddress(env, tmp, port);
+    }
+
+    const void* rawAddress;
+    size_t addressLength;
+    int sin_port = 0;
+    int scope_id = 0;
+    if (ss.ss_family == AF_INET) {
+        const sockaddr_in& sin = reinterpret_cast<const sockaddr_in&>(ss);
+        rawAddress = &sin.sin_addr.s_addr;
+        addressLength = 4;
+        sin_port = ntohs(sin.sin_port);
+    } else if (ss.ss_family == AF_INET6) {
+        const sockaddr_in6& sin6 = reinterpret_cast<const sockaddr_in6&>(ss);
+        rawAddress = &sin6.sin6_addr.s6_addr;
+        addressLength = 16;
+        sin_port = ntohs(sin6.sin6_port);
+        scope_id = sin6.sin6_scope_id;
+    } else if (ss.ss_family == AF_UNIX) {
+        const sockaddr_un& sun = reinterpret_cast<const sockaddr_un&>(ss);
+        rawAddress = &sun.sun_path;
+        addressLength = strlen(sun.sun_path);
+    } else {
+        // We can't throw SocketException. We aren't meant to see bad addresses, so seeing one
+        // really does imply an internal error.
+        //jniThrowExceptionFmt(env, "java/lang/IllegalArgumentException",
+        //                     "sockaddrToInetAddress unsupported ss_family: %i", ss.ss_family);
+        cephThrowIllegalArg(env, "sockaddrToInetAddress unsupposed ss_family");
+        return NULL;
+    }
+    if (port != NULL) {
+        *port = sin_port;
+    }
+
+    ScopedLocalRef<jbyteArray> byteArray(env, env->NewByteArray(addressLength));
+    if (byteArray.get() == NULL) {
+        return NULL;
+    }
+    env->SetByteArrayRegion(byteArray.get(), 0, addressLength,
+			    reinterpret_cast<jbyte*>(const_cast<void*>(rawAddress)));
+
+    if (ss.ss_family == AF_UNIX) {
+        // Note that we get here for AF_UNIX sockets on accept(2). The unix(7) man page claims
+        // that the peer's sun_path will contain the path, but in practice it doesn't, and the
+        // peer length is returned as 2 (meaning only the sun_family field was set).
+        //
+        // Ceph Note: this isn't supported. inetUnixAddress appears to just be
+        // something in Dalvik/Android stuff.
+        cephThrowInternal(env, "OSD address should never be a UNIX socket");
+        return NULL;
+        //static jmethodID ctor = env->GetMethodID(JniConstants::inetUnixAddressClass, "<init>", "([B)V");
+        //return env->NewObject(JniConstants::inetUnixAddressClass, ctor, byteArray.get());
+    }
+
+    if (addressLength == 4) {
+      static jmethodID getByAddressMethod = env->GetStaticMethodID(JniConstants::inetAddressClass,
+          "getByAddress", "(Ljava/lang/String;[B)Ljava/net/InetAddress;");
+      if (getByAddressMethod == NULL) {
+        return NULL;
+      }
+      return env->CallStaticObjectMethod(JniConstants::inetAddressClass, getByAddressMethod,
+          NULL, byteArray.get());
+    } else if (addressLength == 16) {
+      static jmethodID getByAddressMethod = env->GetStaticMethodID(JniConstants::inet6AddressClass,
+          "getByAddress", "(Ljava/lang/String;[BI)Ljava/net/Inet6Address;");
+      if (getByAddressMethod == NULL) {
+        return NULL;
+      }
+      return env->CallStaticObjectMethod(JniConstants::inet6AddressClass, getByAddressMethod,
+          NULL, byteArray.get(), scope_id);
+    } else {
+      abort();
+      return NULL;
+    }
+}
+
+/*
+ * Class:     com_ceph_fs_CephMount
+ * Method:    native_ceph_get_osd_addr
+ * Signature: (JI)Ljava/net/InetAddress;
+ */
+JNIEXPORT jobject JNICALL Java_com_ceph_fs_CephMount_native_1ceph_1get_1osd_1addr
+  (JNIEnv *env, jclass clz, jlong j_mntp, jint osd)
+{
+	struct ceph_mount_info *cmount = get_ceph_mount(j_mntp);
+	CephContext *cct = ceph_get_mount_context(cmount);
+  struct sockaddr_storage addr;
+  int ret;
+
+	CHECK_MOUNTED(cmount, NULL);
+
+  ldout(cct, 10) << "jni: get_osd_addr: osd " << osd << dendl;
+
+  ret = ceph_get_osd_addr(cmount, osd, &addr);
+
+  ldout(cct, 10) << "jni: get_osd_addr: ret " << ret << dendl;
+
+  if (ret < 0) {
+    handle_error(env, ret);
+    return NULL;
+  }
+
+  return sockaddrToInetAddress(env, addr, NULL);
+}