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Diffstat (limited to '')
| -rw-r--r-- | src/tools/cephfs/Dumper.cc | 431 |
1 files changed, 431 insertions, 0 deletions
diff --git a/src/tools/cephfs/Dumper.cc b/src/tools/cephfs/Dumper.cc new file mode 100644 index 00000000..6b758497 --- /dev/null +++ b/src/tools/cephfs/Dumper.cc @@ -0,0 +1,431 @@ +// -*- 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 "mon/MonClient.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_, const std::string &type) +{ + role = role_; + + int r = MDSUtility::init(); + if (r < 0) { + return r; + } + + auto fs = fsmap->get_filesystem(role.fscid); + ceph_assert(fs != nullptr); + + if (type == "mdlog") { + 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; + } + } else if (type == "purge_queue") { + ino = MDS_INO_PURGE_QUEUE + role.rank; + } else { + ceph_abort(); // should not get here + } + 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); + ceph_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 + uuid_d fsid = monc->get_fsid(); + char fsid_str[40]; + fsid.print(fsid_str); + 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 stripe_unit %lu (0x%lx)\n stripe_count %lu (0x%lx)\n\ + object_size %lu (0x%lx)\n fsid %s\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, + (unsigned long)journaler.last_committed.layout.stripe_unit, (unsigned long)journaler.last_committed.layout.stripe_unit, + (unsigned long)journaler.last_committed.layout.stripe_count, (unsigned long)journaler.last_committed.layout.stripe_count, + (unsigned long)journaler.last_committed.layout.object_size, (unsigned long)journaler.last_committed.layout.object_size, + fsid_str, + 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 = std::min<uint64_t>(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, bool force) +{ + cout << "undump " << dump_file << std::endl; + + auto fs = fsmap->get_filesystem(role.fscid); + ceph_assert(fs != nullptr); + + int r = 0; + // try get layout info from cluster + Journaler journaler("umdumper", ino, fs->mds_map.get_metadata_pool(), + CEPH_FS_ONDISK_MAGIC, objecter, 0, 0, + &finisher); + int recovered = recover_journal(&journaler); + if (recovered != 0) { + derr << "recover_journal failed, try to get header from dump file " << dendl; + } + + 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; + long unsigned stripe_unit, stripe_count, object_size; + 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 (!force) { + // need to check if fsid match onlien cluster fsid + if (strstr(buf, "fsid")) { + uuid_d fsid; + char fsid_str[40]; + sscanf(strstr(buf, "fsid"), "fsid %39s", fsid_str); + r = fsid.parse(fsid_str); + if (!r) { + derr << "Invalid fsid" << dendl; + ::close(fd); + return -EINVAL; + } + + if (fsid != monc->get_fsid()) { + derr << "Imported journal fsid does not match online cluster fsid" << dendl; + derr << "Use --force to skip fsid check" << dendl; + ::close(fd); + return -EINVAL; + } + } else { + derr << "Invalid header, no fsid embeded" << dendl; + ::close(fd); + return -EINVAL; + } + } + + if (recovered == 0) { + stripe_unit = journaler.last_committed.layout.stripe_unit; + stripe_count = journaler.last_committed.layout.stripe_count; + object_size = journaler.last_committed.layout.object_size; + } else { + // try to get layout from dump file header, if failed set layout to default + if (strstr(buf, "stripe_unit")) { + sscanf(strstr(buf, "stripe_unit"), "stripe_unit %lu", &stripe_unit); + } else { + stripe_unit = file_layout_t::get_default().stripe_unit; + } + if (strstr(buf, "stripe_count")) { + sscanf(strstr(buf, "stripe_count"), "stripe_count %lu", &stripe_count); + } else { + stripe_count = file_layout_t::get_default().stripe_count; + } + if (strstr(buf, "object_size")) { + sscanf(strstr(buf, "object_size"), "object_size %lu", &object_size); + } else { + object_size = file_layout_t::get_default().object_size; + } + } + + 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 % 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 << + " stripe_unit " << stripe_unit << + " stripe_count " << stripe_count << + " object_size " << object_size << 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.stripe_unit = stripe_unit; + h.layout.stripe_count = stripe_count; + h.layout.object_size = object_size; + 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; + ceph_assert(object_size > 0); + uint64_t last_obj = h.write_pos / object_size; + uint64_t purge_count = 2; + /* When the length is zero, the last_obj should be zeroed + * from the offset determined by the new write_pos instead of being purged. + */ + if (!len) { + purge_count = 1; + ++last_obj; + } + 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(); + } + /* When the length is zero, zero the last object + * from the offset determined by the new write_pos. + */ + if (!len) { + uint64_t offset_in_obj = h.write_pos % h.layout.object_size; + uint64_t len = h.layout.object_size - offset_in_obj; + C_SaferCond zero_cond; + cout << "Zeroing " << len << " bytes in the last object." << std::endl; + + lock.Lock(); + filer.zero(ino, &h.layout, snapc, h.write_pos, len, ceph::real_clock::now(), 0, &zero_cond); + lock.Unlock(); + zero_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 = std::min<uint64_t>(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; +} + |