com.ceph.fs.CephMount Maven / Gradle / Ivy
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/*
* 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.
*/
package com.ceph.fs;
import java.io.IOException;
import java.io.FileNotFoundException;
import java.net.InetAddress;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import java.lang.String;
import com.ceph.crush.Bucket;
public class CephMount {
/*
* Set via JNI callback in native_ceph_create
*
* Do not touch!
*/
private long instance_ptr;
/*
* Flags for open().
*
* Must be synchronized with JNI if changed.
*/
public static final int O_RDONLY = 1;
public static final int O_RDWR = 2;
public static final int O_APPEND = 4;
public static final int O_CREAT = 8;
public static final int O_TRUNC = 16;
public static final int O_EXCL = 32;
public static final int O_WRONLY = 64;
/*
* Whence flags for seek().
*
* Must be synchronized with JNI if changed.
*/
public static final int SEEK_SET = 1;
public static final int SEEK_CUR = 2;
public static final int SEEK_END = 3;
/*
* Attribute flags for setattr().
*
* Must be synchronized with JNI if changed.
*/
public static final int SETATTR_MODE = 1;
public static final int SETATTR_UID = 2;
public static final int SETATTR_GID = 4;
public static final int SETATTR_MTIME = 8;
public static final int SETATTR_ATIME = 16;
/*
* Flags for setxattr();
*
* Must be synchronized with JNI if changed.
*/
public static final int XATTR_CREATE = 1;
public static final int XATTR_REPLACE = 2;
public static final int XATTR_NONE = 3;
/*
* This is run by the class loader and will report early any problems
* finding or linking in the shared JNI library.
*/
static {
CephNativeLoader.checkLoaded();
}
/*
* Package-private: called from CephNativeLoader
*/
static native void native_initialize();
/*
* RW lock used for fine grained synchronization to native
*/
private final ReentrantReadWriteLock rwlock = new ReentrantReadWriteLock();
private final Lock rlock = rwlock.readLock();
private final Lock wlock = rwlock.writeLock();
/*
* Controls clean-up synchronization between the constructor and finalize().
* If native_ceph_create fails, then we want a call to finalize() to not
* attempt to clean-up native context, because there is none.
*/
private boolean initialized = false;
/*
* Try to clean-up. First, unmount() will catch users who forget to do the
* unmount manually. Second, release() will destroy the entire context. It
* is safe to call release after a failure in unmount.
*/
protected void finalize() throws Throwable {
if (initialized) {
try {
unmount();
} catch (Exception e) {}
try {
native_ceph_release(instance_ptr);
} catch (Exception e) {}
}
super.finalize();
}
/**
* Create a new CephMount with specific client id.
*
* @param id client id.
*/
public CephMount(String id) {
native_ceph_create(this, id);
initialized = true;
}
private static native int native_ceph_create(CephMount mount, String id);
/**
* Create a new CephMount with default client id.
*/
public CephMount() {
this(null);
}
/**
* Activate the mount with a given root path.
*
* @param root The path to use as the root (pass null for "/").
*/
public void mount(String root) {
wlock.lock();
try {
native_ceph_mount(instance_ptr, root);
} finally {
wlock.unlock();
}
}
private static native int native_ceph_mount(long mountp, String root);
/**
* Deactivate the mount.
*
* The mount can be reactivated using mount(). Configuration parameters
* previously set are not reset.
*/
public void unmount() {
wlock.lock();
try {
native_ceph_unmount(instance_ptr);
} finally {
wlock.unlock();
}
}
private static native int native_ceph_unmount(long mountp);
/*
* Private access to low-level ceph_release.
*/
private static native int native_ceph_release(long mountp);
/**
* Load configuration from a file.
*
* @param path The path to the configuration file.
*/
public void conf_read_file(String path) throws FileNotFoundException {
rlock.lock();
try {
native_ceph_conf_read_file(instance_ptr, path);
} finally {
rlock.unlock();
}
}
private static native int native_ceph_conf_read_file(long mountp, String path);
/**
* Set the value of a configuration option.
*
* @param option The configuration option to modify.
* @param value The new value of the option.
*/
public void conf_set(String option, String value) {
rlock.lock();
try {
native_ceph_conf_set(instance_ptr, option, value);
} finally {
rlock.unlock();
}
}
private static native int native_ceph_conf_set(long mountp, String option, String value);
/**
* Get the value of a configuration option.
*
* @param option The name of the configuration option.
* @return The value of the option or null if option not found
*/
public String conf_get(String option) {
rlock.lock();
try {
return native_ceph_conf_get(instance_ptr, option);
} finally {
rlock.unlock();
}
}
private static native String native_ceph_conf_get(long mountp, String option);
/**
* Get file system status.
*
* @param path Path to file in file system.
* @param statvfs CephStatVFS structure to hold status.
*/
public void statfs(String path, CephStatVFS statvfs) throws FileNotFoundException {
rlock.lock();
try {
native_ceph_statfs(instance_ptr, path, statvfs);
} finally {
rlock.unlock();
}
}
private static native int native_ceph_statfs(long mountp, String path, CephStatVFS statvfs);
/**
* Get the current working directory.
*
* @return The current working directory in Ceph.
*/
public String getcwd() {
rlock.lock();
try {
return native_ceph_getcwd(instance_ptr);
} finally {
rlock.unlock();
}
}
private static native String native_ceph_getcwd(long mountp);
/**
* Set the current working directory.
*
* @param path The directory set as the cwd.
*/
public void chdir(String path) throws FileNotFoundException {
rlock.lock();
try {
native_ceph_chdir(instance_ptr, path);
} finally {
rlock.unlock();
}
}
private static native int native_ceph_chdir(long mountp, String cwd);
/**
* List the contents of a directory.
*
* @param dir The directory.
* @return List of files and directories excluding "." and "..".
*/
public String[] listdir(String dir) throws FileNotFoundException {
rlock.lock();
try {
return native_ceph_listdir(instance_ptr, dir);
} finally {
rlock.unlock();
}
}
private static native String[] native_ceph_listdir(long mountp, String path);
/**
* Create a hard link to an existing file.
*
* @param oldpath The target path of the link.
* @param newpath The name of the link.
*/
public void link(String oldpath, String newpath) throws FileNotFoundException {
rlock.lock();
try {
native_ceph_link(instance_ptr, oldpath, newpath);
} finally {
rlock.unlock();
}
}
private static native int native_ceph_link(long mountp, String existing, String newname);
/**
* Unlink/delete a name from the file system.
*
* @param path The name to unlink/delete.
*/
public void unlink(String path) throws FileNotFoundException {
rlock.lock();
try {
native_ceph_unlink(instance_ptr, path);
} finally {
rlock.unlock();
}
}
private static native int native_ceph_unlink(long mountp, String path);
/**
* Rename a file or directory.
*
* @param from The current path.
* @param to The new path.
*/
public void rename(String from, String to) throws FileNotFoundException {
rlock.lock();
try {
native_ceph_rename(instance_ptr, from, to);
} finally {
rlock.unlock();
}
}
private static native int native_ceph_rename(long mountp, String from, String to);
/**
* Create a directory.
*
* @param path The directory to create.
* @param mode The mode of the new directory.
*/
public void mkdir(String path, int mode) {
rlock.lock();
try {
native_ceph_mkdir(instance_ptr, path, mode);
} finally {
rlock.unlock();
}
}
private static native int native_ceph_mkdir(long mountp, String path, int mode);
/**
* Create a directory and all parents.
*
* @param path The directory to create.
* @param mode The mode of the new directory.
*/
public void mkdirs(String path, int mode) throws IOException {
rlock.lock();
try {
native_ceph_mkdirs(instance_ptr, path, mode);
} finally {
rlock.unlock();
}
}
private static native int native_ceph_mkdirs(long mountp, String path, int mode);
/**
* Delete a directory.
*
* @param path The directory to delete.
*/
public void rmdir(String path) throws FileNotFoundException {
rlock.lock();
try {
native_ceph_rmdir(instance_ptr, path);
} finally {
rlock.unlock();
}
}
private static native int native_ceph_rmdir(long mountp, String path);
/**
* Read the value of a symbolic link.
*/
public String readlink(String path) throws FileNotFoundException {
rlock.lock();
try {
return native_ceph_readlink(instance_ptr, path);
} finally {
rlock.unlock();
}
}
private static native String native_ceph_readlink(long mountp, String path);
/**
* Create a symbolic link.
*
* @param oldpath Target of the symbolic link.
* @param newpath Name of the link.
*/
public void symlink(String oldpath, String newpath) {
rlock.lock();
try {
native_ceph_symlink(instance_ptr, oldpath, newpath);
} finally {
rlock.unlock();
}
}
private static native int native_ceph_symlink(long mountp, String existing, String newname);
/**
* Get file status.
*
* @param path Path of file to stat.
* @param stat CephStat structure to hold file status.
*/
public void stat(String path, CephStat stat) throws FileNotFoundException, CephNotDirectoryException {
rlock.lock();
try {
native_ceph_stat(instance_ptr, path, stat);
} finally {
rlock.unlock();
}
}
private static native int native_ceph_stat(long mountp, String path, CephStat stat);
/**
* Get file status, without following symlinks.
*
* @param path Path of file to stat.
* @param stat CephStat structure to hold file status.
*/
public void lstat(String path, CephStat stat) throws FileNotFoundException, CephNotDirectoryException {
rlock.lock();
try {
native_ceph_lstat(instance_ptr, path, stat);
} finally {
rlock.unlock();
}
}
private static native int native_ceph_lstat(long mountp, String path, CephStat stat);
/**
* Set file attributes.
*
* @param path Path to file.
* @param stat CephStat structure holding attributes.
* @param mask Mask specifying which attributes to set.
*/
public void setattr(String path, CephStat stat, int mask) throws FileNotFoundException {
rlock.lock();
try {
native_ceph_setattr(instance_ptr, path, stat, mask);
} finally {
rlock.unlock();
}
}
private static native int native_ceph_setattr(long mountp, String relpath, CephStat stat, int mask);
/**
* Change file mode.
*
* @param path Path to file.
* @param mode New mode bits.
*/
public void chmod(String path, int mode) throws FileNotFoundException {
rlock.lock();
try {
native_ceph_chmod(instance_ptr, path, mode);
} finally {
rlock.unlock();
}
}
private static native int native_ceph_chmod(long mountp, String path, int mode);
/**
* Change file mode of an open file.
*
* @param fd The open file descriptor to change the mode bits on.
* @param mode New mode bits.
*/
public void fchmod(int fd, int mode) {
rlock.lock();
try {
native_ceph_fchmod(instance_ptr, fd, mode);
} finally {
rlock.unlock();
}
}
private static native int native_ceph_fchmod(long mountp, int fd, int mode);
/**
* Truncate a file to a specified length.
*
* @param path Path of the file.
* @param size New file length.
*/
public void truncate(String path, long size) throws FileNotFoundException {
rlock.lock();
try {
native_ceph_truncate(instance_ptr, path, size);
} finally {
rlock.unlock();
}
}
private static native int native_ceph_truncate(long mountp, String path, long size);
/**
* Open a file.
*
* @param path Path of file to open or create.
* @param flags Open flags.
* @param mode Permission mode.
* @return File descriptor.
*/
public int open(String path, int flags, int mode) throws FileNotFoundException {
rlock.lock();
try {
return native_ceph_open(instance_ptr, path, flags, mode);
} finally {
rlock.unlock();
}
}
private static native int native_ceph_open(long mountp, String path, int flags, int mode);
/**
* Open a file with a specific file layout.
*
* @param path Path of file to open or create.
* @param flags Open flags.
* @param mode Permission mode.
* @param stripe_unit File layout stripe unit size.
* @param stripe_count File layout stripe count.
* @param object_size Size of each object.
* @param data_pool The target data pool.
* @return File descriptor.
*/
public int open(String path, int flags, int mode, int stripe_unit, int stripe_count,
int object_size, String data_pool) throws FileNotFoundException {
rlock.lock();
try {
return native_ceph_open_layout(instance_ptr, path, flags, mode, stripe_unit,
stripe_count, object_size, data_pool);
} finally {
rlock.unlock();
}
}
private static native int native_ceph_open_layout(long mountp, String path,
int flags, int mode, int stripe_unit, int stripe_count, int object_size, String data_pool);
/**
* Close an open file.
*
* @param fd The file descriptor.
*/
public void close(int fd) {
rlock.lock();
try {
native_ceph_close(instance_ptr, fd);
} finally {
rlock.unlock();
}
}
private static native int native_ceph_close(long mountp, int fd);
/**
* Seek to a position in a file.
*
* @param fd File descriptor.
* @param offset New offset.
* @param whence Whence value.
* @return The new offset.
*/
public long lseek(int fd, long offset, int whence) {
rlock.lock();
try {
return native_ceph_lseek(instance_ptr, fd, offset, whence);
} finally {
rlock.unlock();
}
}
private static native long native_ceph_lseek(long mountp, int fd, long offset, int whence);
/**
* Read from a file.
*
* @param fd The file descriptor.
* @param buf Buffer to for data read.
* @param size Amount of data to read into the buffer.
* @param offset Offset to read from (-1 for current position).
* @return The number of bytes read.
*/
public long read(int fd, byte[] buf, long size, long offset) {
rlock.lock();
try {
return native_ceph_read(instance_ptr, fd, buf, size, offset);
} finally {
rlock.unlock();
}
}
private static native long native_ceph_read(long mountp, int fd, byte[] buf, long size, long offset);
/**
* Write to a file at a specific offset.
*
* @param fd The file descriptor.
* @param buf Buffer to write.
* @param size Amount of data to write.
* @param offset Offset to write from (-1 for current position).
* @return The number of bytes written.
*/
public long write(int fd, byte[] buf, long size, long offset) {
rlock.lock();
try {
return native_ceph_write(instance_ptr, fd, buf, size, offset);
} finally {
rlock.unlock();
}
}
private static native long native_ceph_write(long mountp, int fd, byte[] buf, long size, long offset);
/**
* Truncate a file.
*
* @param fd File descriptor of the file to truncate.
* @param size New file size.
*/
public void ftruncate(int fd, long size) {
rlock.lock();
try {
native_ceph_ftruncate(instance_ptr, fd, size);
} finally {
rlock.unlock();
}
}
private static native int native_ceph_ftruncate(long mountp, int fd, long size);
/**
* Synchronize a file with the file system.
*
* @param fd File descriptor to synchronize.
* @param dataonly Synchronize only data.
*/
public void fsync(int fd, boolean dataonly) {
rlock.lock();
try {
native_ceph_fsync(instance_ptr, fd, dataonly);
} finally {
rlock.unlock();
}
}
private static native int native_ceph_fsync(long mountp, int fd, boolean dataonly);
/**
* Get file status.
*
* @param fd The file descriptor.
* @param stat The object in which to store the status.
*/
public void fstat(int fd, CephStat stat) {
rlock.lock();
try {
native_ceph_fstat(instance_ptr, fd, stat);
} finally {
rlock.unlock();
}
}
private static native int native_ceph_fstat(long mountp, int fd, CephStat stat);
/**
* Synchronize the client with the file system.
*/
public void sync_fs() {
rlock.lock();
try {
native_ceph_sync_fs(instance_ptr);
} finally {
rlock.unlock();
}
}
private static native int native_ceph_sync_fs(long mountp);
/**
* Get an extended attribute value.
*
* If the buffer is large enough to hold the entire attribute value, or
* buf is null, the size of the value is returned.
*
* @param path File path.
* @param name Name of the attribute.
* @param buf Buffer to store attribute value.
* @return The length of the attribute value. See description for more
* details.
*/
public long getxattr(String path, String name, byte[] buf) throws FileNotFoundException {
rlock.lock();
try {
return native_ceph_getxattr(instance_ptr, path, name, buf);
} finally {
rlock.unlock();
}
}
private static native long native_ceph_getxattr(long mountp, String path, String name, byte[] buf);
/**
* Get an extended attribute value of a symbolic link.
*
* If the buffer is large enough to hold the entire attribute value, or
* buf is null, the size of the value is returned.
*
* @param path File path.
* @param name Name of attribute.
* @param buf Buffer to store attribute value.
* @return The length of the attribute value. See description for more
* details.
*/
public long lgetxattr(String path, String name, byte[] buf) throws FileNotFoundException {
rlock.lock();
try {
return native_ceph_lgetxattr(instance_ptr, path, name, buf);
} finally {
rlock.unlock();
}
}
private static native long native_ceph_lgetxattr(long mountp, String path, String name, byte[] buf);
/**
* List extended attributes.
*
* @param path File path.
* @return List of attribute names.
*/
public String[] listxattr(String path) throws FileNotFoundException {
rlock.lock();
try {
return native_ceph_listxattr(instance_ptr, path);
} finally {
rlock.unlock();
}
}
private static native String[] native_ceph_listxattr(long mountp, String path);
/**
* List extended attributes of a symbolic link.
*
* @param path File path.
* @return List of attribute names.
*/
public String[] llistxattr(String path) throws FileNotFoundException {
rlock.lock();
try {
return native_ceph_llistxattr(instance_ptr, path);
} finally {
rlock.unlock();
}
}
private static native String[] native_ceph_llistxattr(long mountp, String path);
/**
* Remove an extended attribute.
*
* @param path File path.
* @param name Name of attribute.
*/
public void removexattr(String path, String name) throws FileNotFoundException {
rlock.lock();
try {
native_ceph_removexattr(instance_ptr, path, name);
} finally {
rlock.unlock();
}
}
private static native int native_ceph_removexattr(long mountp, String path, String name);
/**
* Remove an extended attribute from a symbolic link.
*
* @param path File path.
* @param name Name of attribute.
*/
public void lremovexattr(String path, String name) throws FileNotFoundException {
rlock.lock();
try {
native_ceph_lremovexattr(instance_ptr, path, name);
} finally {
rlock.unlock();
}
}
private static native int native_ceph_lremovexattr(long mountp, String path, String name);
/**
* Set the value of an extended attribute.
*
* @param path The file path.
* @param name The attribute name.
* @param buf The attribute value.
* @param size The size of the attribute value.
* @param flags Flag controlling behavior (XATTR_CREATE/REPLACE/NONE).
*/
public void setxattr(String path, String name, byte[] buf, long size, int flags) throws FileNotFoundException {
rlock.lock();
try {
native_ceph_setxattr(instance_ptr, path, name, buf, size, flags);
} finally {
rlock.unlock();
}
}
private static native int native_ceph_setxattr(long mountp, String path, String name, byte[] buf, long size, int flags);
/**
* Set the value of an extended attribute on a symbolic link.
*
* @param path The file path.
* @param name The attribute name.
* @param buf The attribute value.
* @param size The size of the attribute value.
* @param flags Flag controlling behavior (XATTR_CREATE/REPLACE/NONE).
*/
public void lsetxattr(String path, String name, byte[] buf, long size, int flags) throws FileNotFoundException {
rlock.lock();
try {
native_ceph_lsetxattr(instance_ptr, path, name, buf, size, flags);
} finally {
rlock.unlock();
}
}
private static native int native_ceph_lsetxattr(long mountp, String path, String name, byte[] buf, long size, int flags);
/**
* Get the stripe unit of a file.
*
* @param fd The file descriptor.
* @return The stripe unit.
*/
public int get_file_stripe_unit(int fd) {
rlock.lock();
try {
return native_ceph_get_file_stripe_unit(instance_ptr, fd);
} finally {
rlock.unlock();
}
}
private static native int native_ceph_get_file_stripe_unit(long mountp, int fd);
/**
* Get the name of the pool a file is stored in.
*
* @param fd An open file descriptor.
* @return The pool name.
*/
public String get_file_pool_name(int fd) {
rlock.lock();
try {
return native_ceph_get_file_pool_name(instance_ptr, fd);
} finally {
rlock.unlock();
}
}
private static native String native_ceph_get_file_pool_name(long mountp, int fd);
/**
* Get the replication of a file.
*
* @param fd The file descriptor.
* @return The file replication.
*/
public int get_file_replication(int fd) {
rlock.lock();
try {
return native_ceph_get_file_replication(instance_ptr, fd);
} finally {
rlock.unlock();
}
}
private static native int native_ceph_get_file_replication(long mountp, int fd);
/**
* Favor reading from local replicas when possible.
*
* @param state Enable or disable localized reads.
*/
public void localize_reads(boolean state) {
rlock.lock();
try {
native_ceph_localize_reads(instance_ptr, state);
} finally {
rlock.unlock();
}
}
private static native int native_ceph_localize_reads(long mountp, boolean on);
/**
* Get file layout stripe unit granularity.
*
* @return Stripe unit granularity.
*/
public int get_stripe_unit_granularity() {
rlock.lock();
try {
return native_ceph_get_stripe_unit_granularity(instance_ptr);
} finally {
rlock.unlock();
}
}
private static native int native_ceph_get_stripe_unit_granularity(long mountp);
/**
* Get the pool id for the named pool.
*
* @param name The pool name.
* @return The pool id.
*/
public int get_pool_id(String name) throws CephPoolException {
rlock.lock();
try {
return native_ceph_get_pool_id(instance_ptr, name);
} catch (FileNotFoundException e) {
throw new CephPoolException("pool name " + name + " not found");
} finally {
rlock.unlock();
}
}
private static native int native_ceph_get_pool_id(long mountp, String name) throws FileNotFoundException;
/**
* Get the pool replication factor.
*
* @param pool_id The pool id.
* @return Number of replicas stored in the pool.
*/
public int get_pool_replication(int pool_id) throws CephPoolException {
rlock.lock();
try {
return native_ceph_get_pool_replication(instance_ptr, pool_id);
} catch (FileNotFoundException e) {
throw new CephPoolException("pool id " + pool_id + " not found");
} finally {
rlock.unlock();
}
}
private static native int native_ceph_get_pool_replication(long mountp, int pool_id) throws FileNotFoundException;
/**
* Get file extent containing a given offset.
*
* @param fd The file descriptor.
* @param offset Offset in file.
* @return A CephFileExtent object.
*/
public CephFileExtent get_file_extent(int fd, long offset) {
rlock.lock();
try {
return native_ceph_get_file_extent_osds(instance_ptr, fd, offset);
} finally {
rlock.unlock();
}
}
private static native CephFileExtent native_ceph_get_file_extent_osds(long mountp, int fd, long offset);
/**
* Get the fully qualified CRUSH location of an OSD.
*
* Returns (type, name) string pairs for each device in the CRUSH bucket
* hierarchy starting from the given OSD to the root.
*
* @param osd The OSD device id.
* @return List of pairs.
*/
public Bucket[] get_osd_crush_location(int osd) {
rlock.lock();
try {
String[] parts = native_ceph_get_osd_crush_location(instance_ptr, osd);
Bucket[] path = new Bucket[parts.length / 2];
for (int i = 0; i < path.length; i++)
path[i] = new Bucket(parts[i*2], parts[i*2+1]);
return path;
} finally {
rlock.unlock();
}
}
private static native String[] native_ceph_get_osd_crush_location(long mountp, int osd);
/**
* Get the network address of an OSD.
*
* @param osd The OSD device id.
* @return The network address.
*/
public InetAddress get_osd_address(int osd) {
rlock.lock();
try {
return native_ceph_get_osd_addr(instance_ptr, osd);
} finally {
rlock.unlock();
}
}
private static native InetAddress native_ceph_get_osd_addr(long mountp, int osd);
}
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