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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 "RadosDump.h"
using std::cerr;
using std::cout;
int RadosDump::read_super()
{
bufferlist ebl;
auto ebliter = ebl.cbegin();
ssize_t bytes;
bytes = ebl.read_fd(file_fd, super_header::FIXED_LENGTH);
if ((size_t)bytes != super_header::FIXED_LENGTH) {
cerr << "Unexpected EOF" << std::endl;
return -EFAULT;
}
sh.decode(ebliter);
return 0;
}
int RadosDump::get_header(header *h)
{
assert (h != NULL);
bufferlist ebl;
auto ebliter = ebl.cbegin();
ssize_t bytes;
bytes = ebl.read_fd(file_fd, sh.header_size);
if ((size_t)bytes != sh.header_size) {
cerr << "Unexpected EOF" << std::endl;
return -EFAULT;
}
h->decode(ebliter);
return 0;
}
int RadosDump::get_footer(footer *f)
{
ceph_assert(f != NULL);
bufferlist ebl;
auto ebliter = ebl.cbegin();
ssize_t bytes;
bytes = ebl.read_fd(file_fd, sh.footer_size);
if ((size_t)bytes != sh.footer_size) {
cerr << "Unexpected EOF" << std::endl;
return -EFAULT;
}
f->decode(ebliter);
if (f->magic != endmagic) {
cerr << "Bad footer magic" << std::endl;
return -EFAULT;
}
return 0;
}
int RadosDump::read_section(sectiontype_t *type, bufferlist *bl)
{
header hdr;
ssize_t bytes;
int ret = get_header(&hdr);
if (ret)
return ret;
*type = hdr.type;
bl->clear();
bytes = bl->read_fd(file_fd, hdr.size);
if (bytes != hdr.size) {
cerr << "Unexpected EOF" << std::endl;
return -EFAULT;
}
if (hdr.size > 0) {
footer ft;
ret = get_footer(&ft);
if (ret)
return ret;
}
return 0;
}
int RadosDump::skip_object(bufferlist &bl)
{
bufferlist ebl;
bool done = false;
while(!done) {
sectiontype_t type;
int ret = read_section(&type, &ebl);
if (ret)
return ret;
if (type >= END_OF_TYPES) {
cout << "Skipping unknown object section type" << std::endl;
continue;
}
switch(type) {
case TYPE_DATA:
case TYPE_ATTRS:
case TYPE_OMAP_HDR:
case TYPE_OMAP:
#ifdef DIAGNOSTIC
cerr << "Skip type " << (int)type << std::endl;
#endif
break;
case TYPE_OBJECT_END:
done = true;
break;
default:
cerr << "Can't skip unknown type: " << type << std::endl;
return -EFAULT;
}
}
return 0;
}
//Write super_header with its fixed 16 byte length
void RadosDump::write_super()
{
if (dry_run) {
return;
}
bufferlist superbl;
super_header sh;
footer ft;
header hdr(TYPE_NONE, 0);
hdr.encode(superbl);
sh.magic = super_header::super_magic;
sh.version = super_header::super_ver;
sh.header_size = superbl.length();
superbl.clear();
ft.encode(superbl);
sh.footer_size = superbl.length();
superbl.clear();
sh.encode(superbl);
ceph_assert(super_header::FIXED_LENGTH == superbl.length());
superbl.write_fd(file_fd);
}
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