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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2015 Red Hat
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#include "include/rados/librados.hpp"
#include "common/errno.h"
#include "PoolDump.h"
using namespace librados;
using std::cerr;
using std::less;
using std::map;
using std::string;
#define dout_context g_ceph_context
#define dout_subsys ceph_subsys_rados
/**
* Export RADOS objects from a live cluster
* to a serialized format via a file descriptor.
*
* @returns 0 on success, else error code
*/
int PoolDump::dump(IoCtx *io_ctx)
{
ceph_assert(io_ctx != NULL);
int r = 0;
write_super();
r = write_simple(TYPE_POOL_BEGIN, file_fd);
if (r != 0) {
return r;
}
io_ctx->set_namespace(all_nspaces);
librados::NObjectIterator i = io_ctx->nobjects_begin();
librados::NObjectIterator i_end = io_ctx->nobjects_end();
for (; i != i_end; ++i) {
const std::string oid = i->get_oid();
dout(10) << "OID '" << oid << "'" << dendl;
// Compose OBJECT_BEGIN
// ====================
object_begin obj_begin;
obj_begin.hoid.hobj.oid = i->get_oid();
obj_begin.hoid.hobj.nspace = i->get_nspace();
obj_begin.hoid.hobj.set_key(i->get_locator());
// Only output head, RadosImport only wants that
obj_begin.hoid.hobj.snap = CEPH_NOSNAP;
// Skip setting object_begin.oi, RadosImport doesn't care
r = write_section(TYPE_OBJECT_BEGIN, obj_begin, file_fd);
if (r != 0) {
return r;
}
// Compose TYPE_DATA chunks
// ========================
const uint32_t op_size = 4096 * 1024;
uint64_t offset = 0;
io_ctx->set_namespace(i->get_nspace());
io_ctx->locator_set_key(i->get_locator());
while (true) {
bufferlist outdata;
r = io_ctx->read(oid, outdata, op_size, offset);
if (r <= 0) {
// Error or no data
break;
}
r = write_section(TYPE_DATA,
data_section(offset, outdata.length(), outdata), file_fd);
if (r != 0) {
// Output stream error
return r;
}
if (outdata.length() < op_size) {
// No more data
break;
}
offset += outdata.length();
}
// Compose TYPE_ATTRS chunk
// ========================
std::map<std::string, bufferlist> raw_xattrs;
std::map<std::string, bufferlist,less<>> xattrs;
r = io_ctx->getxattrs(oid, raw_xattrs);
if (r < 0) {
cerr << "error getting xattr set " << oid << ": " << cpp_strerror(r)
<< std::endl;
return r;
}
// Prepend "_" to mimic how user keys are represented in a pg export
for (std::map<std::string, bufferlist>::iterator i = raw_xattrs.begin();
i != raw_xattrs.end(); ++i) {
std::pair< std::string, bufferlist> item(std::string("_") + std::string(i->first.c_str()), i->second);
xattrs.insert(item);
}
r = write_section(TYPE_ATTRS, attr_section(xattrs), file_fd);
if (r != 0) {
return r;
}
// Compose TYPE_OMAP_HDR section
// =============================
bufferlist omap_header;
r = io_ctx->omap_get_header(oid, &omap_header);
if (r < 0) {
cerr << "error getting omap header " << oid
<< ": " << cpp_strerror(r) << std::endl;
return r;
}
r = write_section(TYPE_OMAP_HDR, omap_hdr_section(omap_header), file_fd);
if (r != 0) {
return r;
}
// Compose TYPE_OMAP
int MAX_READ = 512;
string last_read = "";
do {
map<string, bufferlist> values;
r = io_ctx->omap_get_vals(oid, last_read, MAX_READ, &values);
if (r < 0) {
cerr << "error getting omap keys " << oid << ": "
<< cpp_strerror(r) << std::endl;
return r;
}
if (values.size()) {
last_read = values.rbegin()->first;
} else {
break;
}
r = write_section(TYPE_OMAP, omap_section(values), file_fd);
if (r != 0) {
return r;
}
r = values.size();
} while (r == MAX_READ);
// Close object
// =============
r = write_simple(TYPE_OBJECT_END, file_fd);
if (r != 0) {
return r;
}
}
r = write_simple(TYPE_POOL_END, file_fd);
#if defined(__linux__)
if (file_fd != STDOUT_FILENO)
posix_fadvise(file_fd, 0, 0, POSIX_FADV_DONTNEED);
#endif
return r;
}
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