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#ifndef __LIBRADOSSTRIPER_HPP
#define __LIBRADOSSTRIPER_HPP
#include <string.h>
#include <string>
#include <map>
#include "../rados/buffer.h"
#include "../rados/librados.hpp"
#include "libradosstriper.h"
namespace libradosstriper
{
struct RadosStriperImpl;
struct MultiAioCompletionImpl;
/*
* Completion object for multiple asynchronous IO
* It allows to internally handle several "requests"
*/
struct MultiAioCompletion {
MultiAioCompletion(MultiAioCompletionImpl *pc_) : pc(pc_) {}
~MultiAioCompletion();
int set_complete_callback(void *cb_arg, librados::callback_t cb);
int set_safe_callback(void *cb_arg, librados::callback_t cb);
void wait_for_complete();
void wait_for_safe();
void wait_for_complete_and_cb();
void wait_for_safe_and_cb();
bool is_complete();
bool is_safe();
bool is_complete_and_cb();
bool is_safe_and_cb();
int get_return_value();
void release();
MultiAioCompletionImpl *pc;
};
/* RadosStriper : This class allows to perform read/writes on striped objects
*
* Typical use (error checking omitted):
*
* RadosStriper rs;
* RadosStriper.striper_create("my_cluster", rs);
* bufferlist bl;
* ... put data in bl ...
* rs.write(object_name, bl, len, offset);
* bufferlist bl2;
* rs.read(object_name, &bl2, len, offset);
* ...
*/
class RadosStriper
{
public:
/*
* constructor
*/
RadosStriper();
/*
* builds the C counter part of a RadosStriper
*/
static void to_rados_striper_t(RadosStriper &striper,
rados_striper_t *s);
/*
* copy constructor
*/
RadosStriper(const RadosStriper& rs);
/*
* operator=
*/
RadosStriper& operator=(const RadosStriper& rs);
/*
* destructor
* Internally calling close() if an object is currently opened
*/
~RadosStriper();
/*
* create method
*/
static int striper_create(librados::IoCtx& ioctx,
RadosStriper *striper);
/*
* set object layout's stripe unit
* This layout will be used when new objects are created (by writing to them)
* Already existing objects will be opened with their own layout.
*/
int set_object_layout_stripe_unit(unsigned int stripe_unit);
/*
* set object layout's stripe count
* This layout will be used when new objects are created (by writing to them)
* Already existing objects will be opened with their own layout.
*/
int set_object_layout_stripe_count(unsigned int stripe_count);
/*
* set object layout's object size
* This layout will be used when new objects are created (by writing to them)
* Already existing objects will be opened with their own layout.
*/
int set_object_layout_object_size(unsigned int object_size);
/**
* Get the value of an extended attribute on a striped object
*/
int getxattr(const std::string& oid, const char *name, ceph::bufferlist& bl);
/**
* Set the value of an extended attribute on a striped object
*/
int setxattr(const std::string& oid, const char *name, ceph::bufferlist& bl);
/**
* Delete an extended attribute from a striped object
*/
int rmxattr(const std::string& oid, const char *name);
/**
* Start iterating over xattrs on a striped object.
*/
int getxattrs(const std::string& oid,
std::map<std::string, ceph::bufferlist>& attrset);
/**
* synchronously write to the striped object at the specified offset.
* NOTE: this call steals the contents of @param bl.
*/
int write(const std::string& soid, const ceph::bufferlist& bl, size_t len, uint64_t off);
/**
* synchronously fill the striped object with the specified data
* NOTE: this call steals the contents of @param bl.
*/
int write_full(const std::string& soid, const ceph::bufferlist& bl);
/**
* synchronously append data to the striped object
* NOTE: this call steals the contents of @p bl.
*/
int append(const std::string& soid, const ceph::bufferlist& bl, size_t len);
/**
* asynchronously write to the striped object at the specified offset.
* NOTE: this call steals the contents of @p bl.
*/
int aio_write(const std::string& soid, librados::AioCompletion *c, const ceph::bufferlist& bl, size_t len, uint64_t off);
/**
* asynchronously fill the striped object with the specified data
* NOTE: this call steals the contents of @p bl.
*/
int aio_write_full(const std::string& soid, librados::AioCompletion *c, const ceph::bufferlist& bl);
/**
* asynchronously append data to the striped object
* NOTE: this call steals the contents of @p bl.
*/
int aio_append(const std::string& soid, librados::AioCompletion *c, const ceph::bufferlist& bl, size_t len);
/**
* synchronously read from the striped object at the specified offset.
*/
int read(const std::string& soid, ceph::bufferlist* pbl, size_t len, uint64_t off);
/**
* asynchronously read from the striped object at the specified offset.
*/
int aio_read(const std::string& soid, librados::AioCompletion *c, ceph::bufferlist *pbl, size_t len, uint64_t off);
/**
* synchronously get striped object stats (size/mtime)
*/
int stat(const std::string& soid, uint64_t *psize, time_t *pmtime);
int stat2(const std::string& soid, uint64_t *psize, struct timespec *pts);
/**
* asynchronously get striped object stats (size/mtime)
*/
int aio_stat(const std::string& soid, librados::AioCompletion *c,
uint64_t *psize, time_t *pmtime);
int aio_stat2(const std::string& soid, librados::AioCompletion *c,
uint64_t *psize, struct timespec *pts);
/**
* deletes a striped object.
* There is no atomicity of the deletion and the striped
* object may be left incomplete if an error is returned (metadata
* all present, but some stripes missing)
* However, there is a atomicity of the metadata deletion and
* the deletion can not happen if any I/O is ongoing (it
* will return EBUSY). Identically, no I/O will be able to start
* during deletion (same EBUSY return code)
*/
int remove(const std::string& soid);
int remove(const std::string& soid, int flags);
/**
* asynchronous remove of striped objects
* See synchronous version for comments on (lack of) atomicity
*/
int aio_remove(const std::string& soid, librados::AioCompletion *c);
int aio_remove(const std::string& soid, librados::AioCompletion *c, int flags);
/**
* Resizes a striped object
* the truncation can not happen if any I/O is ongoing (it
* will return EBUSY). Identically, no I/O will be able to start
* during truncation (same EBUSY return code)
*/
int trunc(const std::string& oid, uint64_t size);
/**
* Wait for all currently pending aio writes to be safe.
*
* @returns 0 on success, negative error code on failure
*/
int aio_flush();
/**
* creation of multi aio completion objects
*/
static MultiAioCompletion *multi_aio_create_completion();
static MultiAioCompletion *multi_aio_create_completion(void *cb_arg,
librados::callback_t cb_complete,
librados::callback_t cb_safe);
private:
RadosStriperImpl *rados_striper_impl;
};
}
#endif
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