1 // -*- mode:c++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
2 // vim: ts=8 sw=2 smarttab
4 * ceph - scalable distributed file system
6 * copyright (c) 2014 john spray <john.spray@inktank.com>
8 * this is free software; you can redistribute it and/or
9 * modify it under the terms of the gnu lesser general public
10 * license version 2.1, as published by the free software
11 * foundation. see file copying.
17 #include "common/ceph_argparse.h"
18 #include "common/errno.h"
19 #include "osdc/Journaler.h"
20 #include "mds/mdstypes.h"
21 #include "mds/LogEvent.h"
22 #include "mds/InoTable.h"
24 #include "mds/events/ENoOp.h"
25 #include "mds/events/EUpdate.h"
27 #include "JournalScanner.h"
28 #include "EventOutput.h"
32 #include "JournalTool.h"
35 #define dout_context g_ceph_context
36 #define dout_subsys ceph_subsys_mds
38 #define dout_prefix *_dout << __func__ << ": "
42 void JournalTool::usage()
44 std::cout << "Usage: \n"
45 << " cephfs-journal-tool [options] journal <command>\n"
50 << " reset [--force]\n"
51 << " cephfs-journal-tool [options] header <get|set <field> <value>\n"
52 << " cephfs-journal-tool [options] event <effect> <selector> <output> [special options]\n"
54 << " --range=<start>..<end>\n"
55 << " --path=<substring>\n"
56 << " --inode=<integer>\n"
57 << " --type=<UPDATE|OPEN|SESSION...><\n"
58 << " --frag=<ino>.<frag> [--dname=<dentry string>]\n"
59 << " --client=<session id integer>\n"
60 << " <effect>: [get|recover_dentries|splice]\n"
61 << " <output>: [summary|list|binary|json] [--path <path>]\n"
63 << "General options:\n"
64 << " --rank=filesystem:mds-rank Journal rank (required if multiple\n"
65 << " file systems, default is rank 0 on\n"
66 << " the only filesystem otherwise.\n"
68 << "Special options\n"
69 << " --alternate-pool <name> Alternative metadata pool to target\n"
70 << " when using recover_dentries.\n";
72 generic_client_usage();
77 * Handle arguments and hand off to journal/header/event mode
79 int JournalTool::main(std::vector<const char*> &argv)
83 dout(10) << "JournalTool::main " << dendl;
91 std::vector<const char*>::iterator arg = argv.begin();
94 if(!ceph_argparse_witharg(argv, arg, &rank_str, "--rank", (char*)NULL)) {
95 // Default: act on rank 0. Will give the user an error if they
96 // try invoking this way when they have more than one filesystem.
100 r = role_selector.parse(*fsmap, rank_str);
102 derr << "Couldn't determine MDS rank." << dendl;
107 if (arg == argv.end()) {
108 derr << "Missing mode [journal|header|event]" << dendl;
111 mode = std::string(*arg);
112 arg = argv.erase(arg);
116 r = rados.init_with_context(g_ceph_context);
118 derr << "RADOS unavailable, cannot scan filesystem journal" << dendl;
122 dout(4) << "JournalTool: connecting to RADOS..." << dendl;
125 derr << "couldn't connect to cluster: " << cpp_strerror(r) << dendl;
129 auto fs = fsmap->get_filesystem(role_selector.get_ns());
130 assert(fs != nullptr);
131 int64_t const pool_id = fs->mds_map.get_metadata_pool();
132 dout(4) << "JournalTool: resolving pool " << pool_id << dendl;
133 std::string pool_name;
134 r = rados.pool_reverse_lookup(pool_id, &pool_name);
136 derr << "Pool " << pool_id << " named in MDS map not found in RADOS!" << dendl;
140 dout(4) << "JournalTool: creating IoCtx.." << dendl;
141 r = rados.ioctx_create(pool_name.c_str(), input);
147 for (auto role : role_selector.get_roles()) {
149 dout(4) << "Executing for rank " << rank << dendl;
150 if (mode == std::string("journal")) {
151 r = main_journal(argv);
152 } else if (mode == std::string("header")) {
153 r = main_header(argv);
154 } else if (mode == std::string("event")) {
155 r = main_event(argv);
157 derr << "Bad command '" << mode << "'" << dendl;
172 * Handle arguments for 'journal' mode
174 * This is for operations that act on the journal as a whole.
176 int JournalTool::main_journal(std::vector<const char*> &argv)
178 std::string command = argv[0];
179 if (command == "inspect") {
180 return journal_inspect();
181 } else if (command == "export" || command == "import") {
182 if (argv.size() >= 2) {
183 std::string const path = argv[1];
184 return journal_export(path, command == "import");
186 derr << "Missing path" << dendl;
189 } else if (command == "reset") {
191 if (argv.size() == 2) {
192 if (std::string(argv[1]) == "--force") {
195 std::cerr << "Unknown argument " << argv[1] << std::endl;
199 } else if (argv.size() > 2) {
200 std::cerr << "Too many arguments!" << std::endl;
204 return journal_reset(force);
206 derr << "Bad journal command '" << command << "'" << dendl;
213 * Parse arguments and execute for 'header' mode
215 * This is for operations that act on the header only.
217 int JournalTool::main_header(std::vector<const char*> &argv)
219 JournalFilter filter;
220 JournalScanner js(input, rank, filter);
221 int r = js.scan(false);
223 std::cerr << "Unable to scan journal" << std::endl;
227 if (!js.header_present) {
228 std::cerr << "Header object not found!" << std::endl;
230 } else if (!js.header_valid && js.header == NULL) {
231 // Can't do a read or a single-field write without a copy of the original
232 derr << "Header could not be read!" << dendl;
235 assert(js.header != NULL);
238 if (argv.size() == 0) {
239 derr << "Invalid header command, must be [get|set]" << dendl;
242 std::vector<const char *>::iterator arg = argv.begin();
243 std::string const command = *arg;
244 arg = argv.erase(arg);
246 if (command == std::string("get")) {
247 // Write JSON journal dump to stdout
248 JSONFormatter jf(true);
249 js.header->dump(&jf);
251 std::cout << std::endl;
252 } else if (command == std::string("set")) {
253 // Need two more args <key> <val>
254 if (argv.size() != 2) {
255 derr << "'set' requires two arguments <trimmed_pos|expire_pos|write_pos> <value>" << dendl;
259 std::string const field_name = *arg;
260 arg = argv.erase(arg);
262 std::string const value_str = *arg;
263 arg = argv.erase(arg);
264 assert(argv.empty());
266 std::string parse_err;
267 uint64_t new_val = strict_strtoll(value_str.c_str(), 0, &parse_err);
268 if (!parse_err.empty()) {
269 derr << "Invalid value '" << value_str << "': " << parse_err << dendl;
273 uint64_t *field = NULL;
274 if (field_name == "trimmed_pos") {
275 field = &(js.header->trimmed_pos);
276 } else if (field_name == "expire_pos") {
277 field = &(js.header->expire_pos);
278 } else if (field_name == "write_pos") {
279 field = &(js.header->write_pos);
281 derr << "Invalid field '" << field_name << "'" << dendl;
285 std::cout << "Updating " << field_name << std::hex << " 0x" << *field << " -> 0x" << new_val << std::dec << std::endl;
288 dout(4) << "Writing object..." << dendl;
289 bufferlist header_bl;
290 ::encode(*(js.header), header_bl);
291 output.write_full(js.obj_name(0), header_bl);
292 dout(4) << "Write complete." << dendl;
293 std::cout << "Successfully updated header." << std::endl;
295 derr << "Bad header command '" << command << "'" << dendl;
304 * Parse arguments and execute for 'event' mode
306 * This is for operations that act on LogEvents within the log
308 int JournalTool::main_event(std::vector<const char*> &argv)
312 std::vector<const char*>::iterator arg = argv.begin();
314 std::string command = *(arg++);
315 if (command != "get" && command != "splice" && command != "recover_dentries") {
316 derr << "Unknown argument '" << command << "'" << dendl;
321 if (arg == argv.end()) {
322 derr << "Incomplete command line" << dendl;
327 // Parse filter options
328 // ====================
329 JournalFilter filter;
330 r = filter.parse_args(argv, arg);
335 // Parse output options
336 // ====================
337 if (arg == argv.end()) {
338 derr << "Missing output command" << dendl;
341 std::string output_style = *(arg++);
342 if (output_style != "binary" && output_style != "json" &&
343 output_style != "summary" && output_style != "list") {
344 derr << "Unknown argument: '" << output_style << "'" << dendl;
349 std::string output_path = "dump";
350 while(arg != argv.end()) {
352 if (ceph_argparse_witharg(argv, arg, &arg_str, "--path", (char*)NULL)) {
353 output_path = arg_str;
354 } else if (ceph_argparse_witharg(argv, arg, &arg_str, "--alternate-pool",
356 dout(1) << "Using alternate pool " << arg_str << dendl;
357 int r = rados.ioctx_create(arg_str.c_str(), output);
361 derr << "Unknown argument: '" << *arg << "'" << dendl;
369 JournalScanner js(input, rank, filter);
370 if (command == "get") {
373 derr << "Failed to scan journal (" << cpp_strerror(r) << ")" << dendl;
376 } else if (command == "recover_dentries") {
379 derr << "Failed to scan journal (" << cpp_strerror(r) << ")" << dendl;
383 bool dry_run = false;
384 if (arg != argv.end() && ceph_argparse_flag(argv, arg, "--dry_run", (char*)NULL)) {
389 * Iterate over log entries, attempting to scavenge from each one
391 std::set<inodeno_t> consumed_inos;
392 for (JournalScanner::EventMap::iterator i = js.events.begin();
393 i != js.events.end(); ++i) {
394 LogEvent *le = i->second.log_event;
395 EMetaBlob const *mb = le->get_metablob();
397 int scav_r = recover_dentries(*mb, dry_run, &consumed_inos);
399 dout(1) << "Error processing event 0x" << std::hex << i->first << std::dec
400 << ": " << cpp_strerror(scav_r) << ", continuing..." << dendl;
404 // Our goal is to read all we can, so don't stop on errors, but
405 // do record them for possible later output
406 js.errors.insert(std::make_pair(i->first,
407 JournalScanner::EventError(scav_r, cpp_strerror(r))));
413 * Update InoTable to reflect any inode numbers consumed during scavenge
415 dout(4) << "consumed " << consumed_inos.size() << " inodes" << dendl;
416 if (consumed_inos.size() && !dry_run) {
417 int consume_r = consume_inos(consumed_inos);
419 dout(1) << "Error updating InoTable for " << consumed_inos.size()
420 << " consume inos: " << cpp_strerror(consume_r) << dendl;
427 // Remove consumed dentries from lost+found.
428 if (other_pool && !dry_run) {
429 std::set<std::string> found;
431 for (auto i : consumed_inos) {
434 snprintf(s, sizeof(s), "%llx_head", (unsigned long long) i);
435 dout(20) << "removing " << s << dendl;
436 found.insert(std::string(s));
440 frag_oid = InodeStore::get_object_name(CEPH_INO_LOST_AND_FOUND,
442 output.omap_rm_keys(frag_oid.name, found);
444 } else if (command == "splice") {
447 derr << "Failed to scan journal (" << cpp_strerror(r) << ")" << dendl;
452 if (filter.get_range(start, end)) {
453 // Special case for range filter: erase a numeric range in the log
454 uint64_t range = end - start;
455 int r = erase_region(js, start, range);
457 derr << "Failed to erase region 0x" << std::hex << start << "~0x" << range << std::dec
458 << ": " << cpp_strerror(r) << dendl;
462 // General case: erase a collection of individual entries in the log
463 for (JournalScanner::EventMap::iterator i = js.events.begin(); i != js.events.end(); ++i) {
464 dout(4) << "Erasing offset 0x" << std::hex << i->first << std::dec << dendl;
466 int r = erase_region(js, i->first, i->second.raw_size);
468 derr << "Failed to erase event 0x" << std::hex << i->first << std::dec
469 << ": " << cpp_strerror(r) << dendl;
477 derr << "Unknown argument '" << command << "'" << dendl;
484 EventOutput output(js, output_path);
485 int output_result = 0;
486 if (output_style == "binary") {
487 output_result = output.binary();
488 } else if (output_style == "json") {
489 output_result = output.json();
490 } else if (output_style == "summary") {
492 } else if (output_style == "list") {
495 std::cerr << "Bad output command '" << output_style << "'" << std::endl;
499 if (output_result != 0) {
500 std::cerr << "Error writing output: " << cpp_strerror(output_result) << std::endl;
503 return output_result;
507 * Provide the user with information about the condition of the journal,
508 * especially indicating what range of log events is available and where
509 * any gaps or corruptions in the journal are.
511 int JournalTool::journal_inspect()
515 JournalFilter filter;
516 JournalScanner js(input, rank, filter);
519 std::cerr << "Failed to scan journal (" << cpp_strerror(r) << ")" << std::endl;
523 js.report(std::cout);
530 * Attempt to export a binary dump of the journal.
532 * This is allowed to fail if the header is malformed or there are
533 * objects inaccessible, in which case the user would have to fall
534 * back to manually listing RADOS objects and extracting them, which
535 * they can do with the ``rados`` CLI.
537 int JournalTool::journal_export(std::string const &path, bool import)
540 JournalScanner js(input, rank);
544 * If doing an export, first check that the header is valid and
545 * no objects are missing before trying to dump
549 derr << "Unable to scan journal, assuming badly damaged" << dendl;
552 if (!js.is_readable()) {
553 derr << "Journal not readable, attempt object-by-object dump with `rados`" << dendl;
559 * Assuming we can cleanly read the journal data, dump it out to a file
563 r = dumper.init(mds_role_t(role_selector.get_ns(), rank));
565 derr << "dumper::init failed: " << cpp_strerror(r) << dendl;
569 r = dumper.undump(path.c_str());
571 r = dumper.dump(path.c_str());
581 * Truncate journal and insert EResetJournal
583 int JournalTool::journal_reset(bool hard)
589 derr << "resetter::init failed: " << cpp_strerror(r) << dendl;
594 r = resetter.reset_hard(mds_role_t(role_selector.get_ns(), rank));
596 r = resetter.reset(mds_role_t(role_selector.get_ns(), rank));
605 * Selective offline replay which only reads out dentries and writes
606 * them to the backing store iff their version is > what is currently
607 * in the backing store.
609 * In order to write dentries to the backing store, we may create the
610 * required enclosing dirfrag objects.
612 * Test this by running scavenge on an unflushed journal, then nuking
613 * it offline, then starting an MDS and seeing that the dentries are
616 * @param metablob an EMetaBlob retrieved from the journal
617 * @param dry_run if true, do no writes to RADOS
618 * @param consumed_inos output, populated with any inos inserted
619 * @returns 0 on success, else negative error code
621 int JournalTool::recover_dentries(
622 EMetaBlob const &metablob,
624 std::set<inodeno_t> *consumed_inos)
626 assert(consumed_inos != NULL);
630 // Replay fullbits (dentry+inode)
631 for (list<dirfrag_t>::const_iterator lp = metablob.lump_order.begin();
632 lp != metablob.lump_order.end(); ++lp)
634 dirfrag_t const &frag = *lp;
635 EMetaBlob::dirlump const &lump = metablob.lump_map.find(frag)->second;
637 object_t frag_oid = InodeStore::get_object_name(frag.ino, frag.frag, "");
639 dout(4) << "inspecting lump " << frag_oid.name << dendl;
642 // We will record old fnode version for use in hard link handling
643 // If we don't read an old fnode, take version as zero and write in
644 // all hardlinks we find.
645 version_t old_fnode_version = 0;
647 // Update fnode in omap header of dirfrag object
648 bool write_fnode = false;
649 bufferlist old_fnode_bl;
650 r = input.omap_get_header(frag_oid.name, &old_fnode_bl);
652 // Creating dirfrag from scratch
653 dout(4) << "failed to read OMAP header from directory fragment "
654 << frag_oid.name << " " << cpp_strerror(r) << dendl;
656 // Note: creating the dirfrag *without* a backtrace, relying on
657 // MDS to regenerate backtraces on read or in FSCK
659 // Conditionally update existing omap header
661 bufferlist::iterator old_fnode_iter = old_fnode_bl.begin();
663 old_fnode.decode(old_fnode_iter);
664 dout(4) << "frag " << frag_oid.name << " fnode old v" <<
665 old_fnode.version << " vs new v" << lump.fnode.version << dendl;
666 old_fnode_version = old_fnode.version;
667 write_fnode = old_fnode_version < lump.fnode.version;
668 } catch (const buffer::error &err) {
669 dout(1) << "frag " << frag_oid.name
670 << " is corrupt, overwriting" << dendl;
675 dout(4) << "failed to read OMAP header from directory fragment "
676 << frag_oid.name << " " << cpp_strerror(r) << dendl;
680 if ((other_pool || write_fnode) && !dry_run) {
681 dout(4) << "writing fnode to omap header" << dendl;
683 lump.fnode.encode(fnode_bl);
684 if (!other_pool || frag.ino >= MDS_INO_SYSTEM_BASE) {
685 r = output.omap_set_header(frag_oid.name, fnode_bl);
688 derr << "Failed to write fnode for frag object "
689 << frag_oid.name << dendl;
694 std::set<std::string> read_keys;
696 // Compose list of potentially-existing dentries we would like to fetch
697 list<ceph::shared_ptr<EMetaBlob::fullbit> > const &fb_list =
699 for (list<ceph::shared_ptr<EMetaBlob::fullbit> >::const_iterator fbi =
700 fb_list.begin(); fbi != fb_list.end(); ++fbi) {
701 EMetaBlob::fullbit const &fb = *(*fbi);
703 // Get a key like "foobar_head"
705 dentry_key_t dn_key(fb.dnlast, fb.dn.c_str());
707 read_keys.insert(key);
710 list<EMetaBlob::remotebit> const &rb_list =
712 for (list<EMetaBlob::remotebit>::const_iterator rbi =
713 rb_list.begin(); rbi != rb_list.end(); ++rbi) {
714 EMetaBlob::remotebit const &rb = *rbi;
716 // Get a key like "foobar_head"
718 dentry_key_t dn_key(rb.dnlast, rb.dn.c_str());
720 read_keys.insert(key);
723 list<EMetaBlob::nullbit> const &nb_list = lump.get_dnull();
724 for (auto& nb : nb_list) {
725 // Get a key like "foobar_head"
727 dentry_key_t dn_key(nb.dnlast, nb.dn.c_str());
729 read_keys.insert(key);
732 // Perform bulk read of existing dentries
733 std::map<std::string, bufferlist> read_vals;
734 r = input.omap_get_vals_by_keys(frag_oid.name, read_keys, &read_vals);
735 if (r == -ENOENT && other_pool) {
736 r = output.omap_get_vals_by_keys(frag_oid.name, read_keys, &read_vals);
739 derr << "unexpected error reading fragment object "
740 << frag_oid.name << ": " << cpp_strerror(r) << dendl;
744 // Compose list of dentries we will write back
745 std::map<std::string, bufferlist> write_vals;
746 for (list<ceph::shared_ptr<EMetaBlob::fullbit> >::const_iterator fbi =
747 fb_list.begin(); fbi != fb_list.end(); ++fbi) {
748 EMetaBlob::fullbit const &fb = *(*fbi);
750 // Get a key like "foobar_head"
752 dentry_key_t dn_key(fb.dnlast, fb.dn.c_str());
755 dout(4) << "inspecting fullbit " << frag_oid.name << "/" << fb.dn
757 bool write_dentry = false;
758 if (read_vals.find(key) == read_vals.end()) {
759 dout(4) << "dentry did not already exist, will create" << dendl;
762 dout(4) << "dentry " << key << " existed already" << dendl;
763 dout(4) << "dentry exists, checking versions..." << dendl;
764 bufferlist &old_dentry = read_vals[key];
765 // Decode dentry+inode
766 bufferlist::iterator q = old_dentry.begin();
769 ::decode(dnfirst, q);
771 ::decode(dentry_type, q);
773 if (dentry_type == 'L') {
774 // leave write_dentry false, we have no version to
775 // compare with in a hardlink, so it's not safe to
776 // squash over it with what's in this fullbit
777 dout(10) << "Existing remote inode in slot to be (maybe) written "
778 << "by a full inode from the journal dn '" << fb.dn.c_str()
779 << "' with lump fnode version " << lump.fnode.version
780 << "vs existing fnode version " << old_fnode_version << dendl;
781 write_dentry = old_fnode_version < lump.fnode.version;
782 } else if (dentry_type == 'I') {
783 // Read out inode version to compare with backing store
785 inode.decode_bare(q);
786 dout(4) << "decoded embedded inode version "
787 << inode.inode.version << " vs fullbit version "
788 << fb.inode.version << dendl;
789 if (inode.inode.version < fb.inode.version) {
793 dout(4) << "corrupt dentry in backing store, overwriting from "
799 if ((other_pool || write_dentry) && !dry_run) {
800 dout(4) << "writing I dentry " << key << " into frag "
801 << frag_oid.name << dendl;
803 // Compose: Dentry format is dnfirst, [I|L], InodeStore(bare=true)
804 bufferlist dentry_bl;
805 ::encode(fb.dnfirst, dentry_bl);
806 ::encode('I', dentry_bl);
807 encode_fullbit_as_inode(fb, true, &dentry_bl);
809 // Record for writing to RADOS
810 write_vals[key] = dentry_bl;
811 consumed_inos->insert(fb.inode.ino);
815 for (list<EMetaBlob::remotebit>::const_iterator rbi =
816 rb_list.begin(); rbi != rb_list.end(); ++rbi) {
817 EMetaBlob::remotebit const &rb = *rbi;
819 // Get a key like "foobar_head"
821 dentry_key_t dn_key(rb.dnlast, rb.dn.c_str());
824 dout(4) << "inspecting remotebit " << frag_oid.name << "/" << rb.dn
826 bool write_dentry = false;
827 if (read_vals.find(key) == read_vals.end()) {
828 dout(4) << "dentry did not already exist, will create" << dendl;
831 dout(4) << "dentry " << key << " existed already" << dendl;
832 dout(4) << "dentry exists, checking versions..." << dendl;
833 bufferlist &old_dentry = read_vals[key];
834 // Decode dentry+inode
835 bufferlist::iterator q = old_dentry.begin();
838 ::decode(dnfirst, q);
840 ::decode(dentry_type, q);
842 if (dentry_type == 'L') {
843 dout(10) << "Existing hardlink inode in slot to be (maybe) written "
844 << "by a remote inode from the journal dn '" << rb.dn.c_str()
845 << "' with lump fnode version " << lump.fnode.version
846 << "vs existing fnode version " << old_fnode_version << dendl;
847 write_dentry = old_fnode_version < lump.fnode.version;
848 } else if (dentry_type == 'I') {
849 dout(10) << "Existing full inode in slot to be (maybe) written "
850 << "by a remote inode from the journal dn '" << rb.dn.c_str()
851 << "' with lump fnode version " << lump.fnode.version
852 << "vs existing fnode version " << old_fnode_version << dendl;
853 write_dentry = old_fnode_version < lump.fnode.version;
855 dout(4) << "corrupt dentry in backing store, overwriting from "
861 if ((other_pool || write_dentry) && !dry_run) {
862 dout(4) << "writing L dentry " << key << " into frag "
863 << frag_oid.name << dendl;
865 // Compose: Dentry format is dnfirst, [I|L], InodeStore(bare=true)
866 bufferlist dentry_bl;
867 ::encode(rb.dnfirst, dentry_bl);
868 ::encode('L', dentry_bl);
869 ::encode(rb.ino, dentry_bl);
870 ::encode(rb.d_type, dentry_bl);
872 // Record for writing to RADOS
873 write_vals[key] = dentry_bl;
874 consumed_inos->insert(rb.ino);
878 std::set<std::string> null_vals;
879 for (auto& nb : nb_list) {
881 dentry_key_t dn_key(nb.dnlast, nb.dn.c_str());
884 dout(4) << "inspecting nullbit " << frag_oid.name << "/" << nb.dn
887 auto it = read_vals.find(key);
888 if (it != read_vals.end()) {
889 dout(4) << "dentry exists, will remove" << dendl;
891 bufferlist::iterator q = it->second.begin();
893 ::decode(dnfirst, q);
895 ::decode(dentry_type, q);
897 bool remove_dentry = false;
898 if (dentry_type == 'L') {
899 dout(10) << "Existing hardlink inode in slot to be (maybe) removed "
900 << "by null journal dn '" << nb.dn.c_str()
901 << "' with lump fnode version " << lump.fnode.version
902 << "vs existing fnode version " << old_fnode_version << dendl;
903 remove_dentry = old_fnode_version < lump.fnode.version;
904 } else if (dentry_type == 'I') {
905 dout(10) << "Existing full inode in slot to be (maybe) removed "
906 << "by null journal dn '" << nb.dn.c_str()
907 << "' with lump fnode version " << lump.fnode.version
908 << "vs existing fnode version " << old_fnode_version << dendl;
909 remove_dentry = old_fnode_version < lump.fnode.version;
911 dout(4) << "corrupt dentry in backing store, will remove" << dendl;
912 remove_dentry = true;
916 null_vals.insert(key);
920 // Write back any new/changed dentries
921 if (!write_vals.empty()) {
922 r = output.omap_set(frag_oid.name, write_vals);
924 derr << "error writing dentries to " << frag_oid.name
925 << ": " << cpp_strerror(r) << dendl;
930 // remove any null dentries
931 if (!null_vals.empty()) {
932 r = output.omap_rm_keys(frag_oid.name, null_vals);
934 derr << "error removing dentries from " << frag_oid.name
935 << ": " << cpp_strerror(r) << dendl;
941 /* Now that we've looked at the dirlumps, we finally pay attention to
942 * the roots (i.e. inodes without ancestry). This is necessary in order
943 * to pick up dirstat updates on ROOT_INO. dirstat updates are functionally
944 * important because clients use them to infer completeness
947 for (list<ceph::shared_ptr<EMetaBlob::fullbit> >::const_iterator p =
948 metablob.roots.begin(); p != metablob.roots.end(); ++p) {
949 EMetaBlob::fullbit const &fb = *(*p);
950 inodeno_t ino = fb.inode.ino;
951 dout(4) << "updating root 0x" << std::hex << ino << std::dec << dendl;
953 object_t root_oid = InodeStore::get_object_name(ino, frag_t(), ".inode");
954 dout(4) << "object id " << root_oid.name << dendl;
956 bool write_root_ino = false;
957 bufferlist old_root_ino_bl;
958 r = input.read(root_oid.name, old_root_ino_bl, (1<<22), 0);
960 dout(4) << "root does not exist, will create" << dendl;
961 write_root_ino = true;
964 InodeStore old_inode;
965 dout(4) << "root exists, will modify (" << old_root_ino_bl.length()
967 bufferlist::iterator inode_bl_iter = old_root_ino_bl.begin();
969 ::decode(magic, inode_bl_iter);
970 if (magic == CEPH_FS_ONDISK_MAGIC) {
971 dout(4) << "magic ok" << dendl;
972 old_inode.decode(inode_bl_iter);
974 if (old_inode.inode.version < fb.inode.version) {
975 write_root_ino = true;
978 dout(4) << "magic bad: '" << magic << "'" << dendl;
979 write_root_ino = true;
982 derr << "error reading root inode object " << root_oid.name
983 << ": " << cpp_strerror(r) << dendl;
987 if (write_root_ino && !dry_run) {
988 dout(4) << "writing root ino " << root_oid.name
989 << " version " << fb.inode.version << dendl;
991 // Compose: root ino format is magic,InodeStore(bare=false)
992 bufferlist new_root_ino_bl;
993 ::encode(std::string(CEPH_FS_ONDISK_MAGIC), new_root_ino_bl);
994 encode_fullbit_as_inode(fb, false, &new_root_ino_bl);
997 r = output.write_full(root_oid.name, new_root_ino_bl);
999 derr << "error writing inode object " << root_oid.name
1000 << ": " << cpp_strerror(r) << dendl;
1011 * Erase a region of the log by overwriting it with ENoOp
1014 int JournalTool::erase_region(JournalScanner const &js, uint64_t const pos, uint64_t const length)
1016 // To erase this region, we use our preamble, the encoding overhead
1017 // of an ENoOp, and our trailing start ptr. Calculate how much padding
1018 // is needed inside the ENoOp to make up the difference.
1021 enoop.encode_with_header(tmp, CEPH_FEATURES_SUPPORTED_DEFAULT);
1023 dout(4) << "erase_region " << pos << " len=" << length << dendl;
1025 // FIXME: get the preamble/postamble length via JournalStream
1026 int32_t padding = length - tmp.length() - sizeof(uint32_t) - sizeof(uint64_t) - sizeof(uint64_t);
1027 dout(4) << "erase_region padding=0x" << std::hex << padding << std::dec << dendl;
1030 derr << "Erase region " << length << " too short" << dendl;
1034 // Serialize an ENoOp with the correct amount of padding
1035 enoop = ENoOp(padding);
1037 enoop.encode_with_header(entry, CEPH_FEATURES_SUPPORTED_DEFAULT);
1038 JournalStream stream(JOURNAL_FORMAT_RESILIENT);
1040 // Serialize region of log stream
1041 bufferlist log_data;
1042 stream.write(entry, &log_data, pos);
1044 dout(4) << "erase_region data length " << log_data.length() << dendl;
1045 assert(log_data.length() == length);
1047 // Write log stream region to RADOS
1048 // FIXME: get object size somewhere common to scan_events
1049 uint32_t object_size = g_conf->mds_log_segment_size;
1050 if (object_size == 0) {
1051 // Default layout object size
1052 object_size = file_layout_t::get_default().object_size;
1055 uint64_t write_offset = pos;
1056 uint64_t obj_offset = (pos / object_size);
1058 while(log_data.length()) {
1059 std::string const oid = js.obj_name(obj_offset);
1060 uint32_t offset_in_obj = write_offset % object_size;
1061 uint32_t write_len = min(log_data.length(), object_size - offset_in_obj);
1063 r = output.write(oid, log_data, write_len, offset_in_obj);
1067 dout(4) << "Wrote " << write_len << " bytes to " << oid << dendl;
1071 log_data.splice(0, write_len);
1072 write_offset += write_len;
1080 * Given an EMetaBlob::fullbit containing an inode, write out
1081 * the encoded inode in the format used by InodeStore (i.e. the
1082 * backing store format)
1084 * This is a distant cousin of EMetaBlob::fullbit::update_inode, but for use
1085 * on an offline InodeStore instance. It's way simpler, because we are just
1086 * uncritically hauling the data between structs.
1088 * @param fb a fullbit extracted from a journal entry
1089 * @param bare if true, leave out [EN|DE]CODE_START decoration
1090 * @param out_bl output, write serialized inode to this bufferlist
1092 void JournalTool::encode_fullbit_as_inode(
1093 const EMetaBlob::fullbit &fb,
1097 assert(out_bl != NULL);
1099 // Compose InodeStore
1100 InodeStore new_inode;
1101 new_inode.inode = fb.inode;
1102 new_inode.xattrs = fb.xattrs;
1103 new_inode.dirfragtree = fb.dirfragtree;
1104 new_inode.snap_blob = fb.snapbl;
1105 new_inode.symlink = fb.symlink;
1106 new_inode.old_inodes = fb.old_inodes;
1108 // Serialize InodeStore
1110 new_inode.encode_bare(*out_bl, CEPH_FEATURES_SUPPORTED_DEFAULT);
1112 new_inode.encode(*out_bl, CEPH_FEATURES_SUPPORTED_DEFAULT);
1117 * Given a list of inode numbers known to be in use by
1118 * inodes in the backing store, ensure that none of these
1119 * numbers are listed as free in the InoTables in the
1122 * Used after injecting inodes into the backing store, to
1123 * ensure that the same inode numbers are not subsequently
1124 * used for new files during ordinary operation.
1126 * @param inos list of inode numbers to be removed from
1127 * free lists in InoTables
1128 * @returns 0 on success, else negative error code
1130 int JournalTool::consume_inos(const std::set<inodeno_t> &inos)
1134 // InoTable is a per-MDS structure, so iterate over assigned ranks
1135 auto fs = fsmap->get_filesystem(role_selector.get_ns());
1136 std::set<mds_rank_t> in_ranks;
1137 fs->mds_map.get_mds_set(in_ranks);
1139 for (std::set<mds_rank_t>::iterator rank_i = in_ranks.begin();
1140 rank_i != in_ranks.end(); ++rank_i)
1142 // Compose object name
1143 std::ostringstream oss;
1144 oss << "mds" << *rank_i << "_inotable";
1145 object_t inotable_oid = object_t(oss.str());
1148 bufferlist inotable_bl;
1149 int read_r = input.read(inotable_oid.name, inotable_bl, (1<<22), 0);
1151 // Things are really bad if we can't read inotable. Beyond our powers.
1152 derr << "unable to read inotable '" << inotable_oid.name << "': "
1153 << cpp_strerror(read_r) << dendl;
1158 // Deserialize InoTable
1159 version_t inotable_ver;
1160 bufferlist::iterator q = inotable_bl.begin();
1161 ::decode(inotable_ver, q);
1162 InoTable ino_table(NULL);
1163 ino_table.decode(q);
1165 // Update InoTable in memory
1166 bool inotable_modified = false;
1167 for (std::set<inodeno_t>::iterator i = inos.begin();
1168 i != inos.end(); ++i)
1170 const inodeno_t ino = *i;
1171 if (ino_table.force_consume(ino)) {
1172 dout(4) << "Used ino 0x" << std::hex << ino << std::dec
1173 << " requires inotable update" << dendl;
1174 inotable_modified = true;
1178 // Serialize and write InoTable
1179 if (inotable_modified) {
1181 dout(4) << "writing modified inotable version " << inotable_ver << dendl;
1182 bufferlist inotable_new_bl;
1183 ::encode(inotable_ver, inotable_new_bl);
1184 ino_table.encode_state(inotable_new_bl);
1185 int write_r = output.write_full(inotable_oid.name, inotable_new_bl);
1187 derr << "error writing modified inotable " << inotable_oid.name
1188 << ": " << cpp_strerror(write_r) << dendl;