--- /dev/null
+// -*- 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) 2010 Greg Farnum <gregf@hq.newdream.net>
+ *
+ * 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.
+ *
+ */
+
+#ifndef _BACKWARD_BACKWARD_WARNING_H
+#define _BACKWARD_BACKWARD_WARNING_H // make gcc 4.3 shut up about hash_*
+#endif
+
+#include "include/compat.h"
+#include "include/fs_types.h"
+#include "common/entity_name.h"
+#include "common/errno.h"
+#include "common/safe_io.h"
+#include "mds/mdstypes.h"
+#include "mds/LogEvent.h"
+#include "mds/JournalPointer.h"
+#include "osdc/Journaler.h"
+
+#include "Dumper.h"
+
+#define dout_context g_ceph_context
+#define dout_subsys ceph_subsys_mds
+
+#define HEADER_LEN 4096
+
+int Dumper::init(mds_role_t role_)
+{
+ role = role_;
+
+ int r = MDSUtility::init();
+ if (r < 0) {
+ return r;
+ }
+
+ auto fs = fsmap->get_filesystem(role.fscid);
+ assert(fs != nullptr);
+
+ JournalPointer jp(role.rank, fs->mds_map.get_metadata_pool());
+ int jp_load_result = jp.load(objecter);
+ if (jp_load_result != 0) {
+ std::cerr << "Error loading journal: " << cpp_strerror(jp_load_result) << std::endl;
+ return jp_load_result;
+ } else {
+ ino = jp.front;
+ return 0;
+ }
+}
+
+
+int Dumper::recover_journal(Journaler *journaler)
+{
+ C_SaferCond cond;
+ lock.Lock();
+ journaler->recover(&cond);
+ lock.Unlock();
+ const int r = cond.wait();
+
+ if (r < 0) { // Error
+ derr << "error on recovery: " << cpp_strerror(r) << dendl;
+ return r;
+ } else {
+ dout(10) << "completed journal recovery" << dendl;
+ return 0;
+ }
+}
+
+
+int Dumper::dump(const char *dump_file)
+{
+ int r = 0;
+
+ auto fs = fsmap->get_filesystem(role.fscid);
+ assert(fs != nullptr);
+
+ Journaler journaler("dumper", ino, fs->mds_map.get_metadata_pool(),
+ CEPH_FS_ONDISK_MAGIC, objecter, 0, 0,
+ &finisher);
+ r = recover_journal(&journaler);
+ if (r) {
+ return r;
+ }
+ uint64_t start = journaler.get_read_pos();
+ uint64_t end = journaler.get_write_pos();
+ uint64_t len = end-start;
+
+ Filer filer(objecter, &finisher);
+
+ cout << "journal is " << start << "~" << len << std::endl;
+
+ int fd = ::open(dump_file, O_WRONLY|O_CREAT|O_TRUNC, 0644);
+ if (fd >= 0) {
+ // include an informative header
+ char buf[HEADER_LEN];
+ memset(buf, 0, sizeof(buf));
+ snprintf(buf, HEADER_LEN, "Ceph mds%d journal dump\n start offset %llu (0x%llx)\n length %llu (0x%llx)\n write_pos %llu (0x%llx)\n format %llu\n trimmed_pos %llu (0x%llx)\n%c",
+ role.rank,
+ (unsigned long long)start, (unsigned long long)start,
+ (unsigned long long)len, (unsigned long long)len,
+ (unsigned long long)journaler.last_committed.write_pos, (unsigned long long)journaler.last_committed.write_pos,
+ (unsigned long long)journaler.last_committed.stream_format,
+ (unsigned long long)journaler.last_committed.trimmed_pos, (unsigned long long)journaler.last_committed.trimmed_pos,
+ 4);
+ r = safe_write(fd, buf, sizeof(buf));
+ if (r) {
+ derr << "Error " << r << " (" << cpp_strerror(r) << ") writing journal file header" << dendl;
+ ::close(fd);
+ return r;
+ }
+
+ // write the data
+ off64_t seeked = ::lseek64(fd, start, SEEK_SET);
+ if (seeked == (off64_t)-1) {
+ r = errno;
+ derr << "Error " << r << " (" << cpp_strerror(r) << ") seeking to 0x" << std::hex << start << std::dec << dendl;
+ ::close(fd);
+ return r;
+ }
+
+
+ // Read and write 32MB chunks. Slower than it could be because we're not
+ // streaming, but that's okay because this is just a debug/disaster tool.
+ const uint32_t chunk_size = 32 * 1024 * 1024;
+
+ for (uint64_t pos = start; pos < start + len; pos += chunk_size) {
+ bufferlist bl;
+ dout(10) << "Reading at pos=0x" << std::hex << pos << std::dec << dendl;
+
+ const uint32_t read_size = MIN(chunk_size, end - pos);
+
+ C_SaferCond cond;
+ lock.Lock();
+ filer.read(ino, &journaler.get_layout(), CEPH_NOSNAP,
+ pos, read_size, &bl, 0, &cond);
+ lock.Unlock();
+ r = cond.wait();
+ if (r < 0) {
+ derr << "Error " << r << " (" << cpp_strerror(r) << ") reading "
+ "journal at offset 0x" << std::hex << pos << std::dec << dendl;
+ ::close(fd);
+ return r;
+ }
+ dout(10) << "Got 0x" << std::hex << bl.length() << std::dec
+ << " bytes" << dendl;
+
+ r = bl.write_fd(fd);
+ if (r) {
+ derr << "Error " << r << " (" << cpp_strerror(r) << ") writing journal file" << dendl;
+ ::close(fd);
+ return r;
+ }
+ }
+
+ r = ::close(fd);
+ if (r) {
+ r = errno;
+ derr << "Error " << r << " (" << cpp_strerror(r) << ") closing journal file" << dendl;
+ return r;
+ }
+
+ cout << "wrote " << len << " bytes at offset " << start << " to " << dump_file << "\n"
+ << "NOTE: this is a _sparse_ file; you can\n"
+ << "\t$ tar cSzf " << dump_file << ".tgz " << dump_file << "\n"
+ << " to efficiently compress it while preserving sparseness." << std::endl;
+ return 0;
+ } else {
+ int err = errno;
+ derr << "unable to open " << dump_file << ": " << cpp_strerror(err) << dendl;
+ return err;
+ }
+}
+
+int Dumper::undump(const char *dump_file)
+{
+ cout << "undump " << dump_file << std::endl;
+
+ auto fs = fsmap->get_filesystem(role.fscid);
+ assert(fs != nullptr);
+
+ int r = 0;
+ int fd = ::open(dump_file, O_RDONLY);
+ if (fd < 0) {
+ r = errno;
+ derr << "couldn't open " << dump_file << ": " << cpp_strerror(r) << dendl;
+ return r;
+ }
+
+ // Ceph mds0 journal dump
+ // start offset 232401996 (0xdda2c4c)
+ // length 1097504 (0x10bf20)
+
+ char buf[HEADER_LEN];
+ r = safe_read(fd, buf, sizeof(buf));
+ if (r < 0) {
+ VOID_TEMP_FAILURE_RETRY(::close(fd));
+ return r;
+ }
+
+ long long unsigned start, len, write_pos, format, trimmed_pos;
+ sscanf(strstr(buf, "start offset"), "start offset %llu", &start);
+ sscanf(strstr(buf, "length"), "length %llu", &len);
+ sscanf(strstr(buf, "write_pos"), "write_pos %llu", &write_pos);
+ sscanf(strstr(buf, "format"), "format %llu", &format);
+ if (strstr(buf, "trimmed_pos")) {
+ sscanf(strstr(buf, "trimmed_pos"), "trimmed_pos %llu", &trimmed_pos);
+ } else {
+ // Old format dump, any untrimmed objects before expire_pos will
+ // be discarded as trash.
+ trimmed_pos = start - (start % file_layout_t::get_default().object_size);
+ }
+
+ if (trimmed_pos > start) {
+ derr << std::hex << "Invalid header (trimmed 0x" << trimmed_pos
+ << " > expire 0x" << start << std::dec << dendl;
+ ::close(fd);
+ return -EINVAL;
+ }
+
+ if (start > write_pos) {
+ derr << std::hex << "Invalid header (expire 0x" << start
+ << " > write 0x" << write_pos << std::dec << dendl;
+ ::close(fd);
+ return -EINVAL;
+ }
+
+ cout << "start " << start <<
+ " len " << len <<
+ " write_pos " << write_pos <<
+ " format " << format <<
+ " trimmed_pos " << trimmed_pos << std::endl;
+
+ Journaler::Header h;
+ h.trimmed_pos = trimmed_pos;
+ h.expire_pos = start;
+ h.write_pos = write_pos;
+ h.stream_format = format;
+ h.magic = CEPH_FS_ONDISK_MAGIC;
+
+ h.layout = file_layout_t::get_default();
+ h.layout.pool_id = fs->mds_map.get_metadata_pool();
+
+ bufferlist hbl;
+ ::encode(h, hbl);
+
+ object_t oid = file_object_t(ino, 0);
+ object_locator_t oloc(fs->mds_map.get_metadata_pool());
+ SnapContext snapc;
+
+ cout << "writing header " << oid << std::endl;
+ C_SaferCond header_cond;
+ lock.Lock();
+ objecter->write_full(oid, oloc, snapc, hbl,
+ ceph::real_clock::now(), 0,
+ &header_cond);
+ lock.Unlock();
+
+ r = header_cond.wait();
+ if (r != 0) {
+ derr << "Failed to write header: " << cpp_strerror(r) << dendl;
+ ::close(fd);
+ return r;
+ }
+
+ Filer filer(objecter, &finisher);
+
+ /* Erase any objects at the end of the region to which we shall write
+ * the new log data. This is to avoid leaving trailing junk after
+ * the newly written data. Any junk more than one object ahead
+ * will be taken care of during normal operation by Journaler's
+ * prezeroing behaviour */
+ {
+ uint32_t const object_size = h.layout.object_size;
+ assert(object_size > 0);
+ uint64_t const last_obj = h.write_pos / object_size;
+ uint64_t const purge_count = 2;
+ C_SaferCond purge_cond;
+ cout << "Purging " << purge_count << " objects from " << last_obj << std::endl;
+ lock.Lock();
+ filer.purge_range(ino, &h.layout, snapc, last_obj, purge_count,
+ ceph::real_clock::now(), 0, &purge_cond);
+ lock.Unlock();
+ purge_cond.wait();
+ }
+
+ // Stream from `fd` to `filer`
+ uint64_t pos = start;
+ uint64_t left = len;
+ while (left > 0) {
+ // Read
+ bufferlist j;
+ lseek64(fd, pos, SEEK_SET);
+ uint64_t l = MIN(left, 1024*1024);
+ j.read_fd(fd, l);
+
+ // Write
+ cout << " writing " << pos << "~" << l << std::endl;
+ C_SaferCond write_cond;
+ lock.Lock();
+ filer.write(ino, &h.layout, snapc, pos, l, j,
+ ceph::real_clock::now(), 0, &write_cond);
+ lock.Unlock();
+
+ r = write_cond.wait();
+ if (r != 0) {
+ derr << "Failed to write header: " << cpp_strerror(r) << dendl;
+ ::close(fd);
+ return r;
+ }
+
+ // Advance
+ pos += l;
+ left -= l;
+ }
+
+ VOID_TEMP_FAILURE_RETRY(::close(fd));
+ cout << "done." << std::endl;
+ return 0;
+}
+
Code Review / stor4nfv.git / blobdiff