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) 2015 Red Hat
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.
15 #include "include/compat.h"
16 #include "common/errno.h"
17 #include "common/ceph_argparse.h"
19 #include "include/util.h"
20 #include "include/ceph_fs.h"
22 #include "mds/CInode.h"
23 #include "mds/InoTable.h"
24 #include "mds/SnapServer.h"
25 #include "cls/cephfs/cls_cephfs_client.h"
29 #include "include/compat.h"
31 #define dout_context g_ceph_context
32 #define dout_subsys ceph_subsys_mds
34 #define dout_prefix *_dout << "datascan." << __func__ << ": "
36 void DataScan::usage()
38 std::cout
<< "Usage: \n"
39 << " cephfs-data-scan init [--force-init]\n"
40 << " cephfs-data-scan scan_extents [--force-pool] [--worker_n N --worker_m M] <data pool name>\n"
41 << " cephfs-data-scan scan_inodes [--force-pool] [--force-corrupt] [--worker_n N --worker_m M] <data pool name>\n"
42 << " cephfs-data-scan pg_files <path> <pg id> [<pg id>...]\n"
43 << " cephfs-data-scan scan_links\n"
45 << " --force-corrupt: overrite apparently corrupt structures\n"
46 << " --force-init: write root inodes even if they exist\n"
47 << " --force-pool: use data pool even if it is not in FSMap\n"
48 << " --worker_m: Maximum number of workers\n"
49 << " --worker_n: Worker number, range 0-(worker_m-1)\n"
51 << " cephfs-data-scan scan_frags [--force-corrupt]\n"
52 << " cephfs-data-scan cleanup <data pool name>\n"
55 generic_client_usage();
58 bool DataScan::parse_kwarg(
59 const std::vector
<const char*> &args
,
60 std::vector
<const char *>::const_iterator
&i
,
63 if (i
+ 1 == args
.end()) {
67 const std::string
arg(*i
);
68 const std::string
val(*(i
+ 1));
70 if (arg
== std::string("--output-dir")) {
72 derr
<< "Unexpected --output-dir: output already selected!" << dendl
;
76 dout(4) << "Using local file output to '" << val
<< "'" << dendl
;
77 driver
= new LocalFileDriver(val
, data_io
);
79 } else if (arg
== std::string("--worker_n")) {
81 n
= strict_strtoll(val
.c_str(), 10, &err
);
83 std::cerr
<< "Invalid worker number '" << val
<< "'" << std::endl
;
88 } else if (arg
== std::string("--worker_m")) {
90 m
= strict_strtoll(val
.c_str(), 10, &err
);
92 std::cerr
<< "Invalid worker count '" << val
<< "'" << std::endl
;
97 } else if (arg
== std::string("--filter-tag")) {
99 dout(10) << "Applying tag filter: '" << filter_tag
<< "'" << dendl
;
101 } else if (arg
== std::string("--filesystem")) {
102 std::shared_ptr
<const Filesystem
> fs
;
103 *r
= fsmap
->parse_filesystem(val
, &fs
);
105 std::cerr
<< "Invalid filesystem '" << val
<< "'" << std::endl
;
110 } else if (arg
== std::string("--alternate-pool")) {
111 metadata_pool_name
= val
;
118 bool DataScan::parse_arg(
119 const std::vector
<const char*> &args
,
120 std::vector
<const char *>::const_iterator
&i
)
122 const std::string
arg(*i
);
123 if (arg
== "--force-pool") {
126 } else if (arg
== "--force-corrupt") {
127 force_corrupt
= true;
129 } else if (arg
== "--force-init") {
137 int DataScan::main(const std::vector
<const char*> &args
)
141 if (args
.size() < 1) {
142 cerr
<< "missing position argument" << std::endl
;
146 // Common RADOS init: open metadata pool
147 // =====================================
148 librados::Rados rados
;
149 int r
= rados
.init_with_context(g_ceph_context
);
151 derr
<< "RADOS unavailable" << dendl
;
155 std::string
const &command
= args
[0];
156 std::string data_pool_name
;
158 std::string pg_files_path
;
159 std::set
<pg_t
> pg_files_pgs
;
161 // Consume any known --key val or --flag arguments
162 for (std::vector
<const char *>::const_iterator i
= args
.begin() + 1;
163 i
!= args
.end(); ++i
) {
164 if (parse_kwarg(args
, i
, &r
)) {
165 // Skip the kwarg value field
172 if (parse_arg(args
, i
)) {
176 // Trailing positional argument
177 if (i
+ 1 == args
.end() &&
178 (command
== "scan_inodes"
179 || command
== "scan_extents"
180 || command
== "cleanup")) {
185 if (command
== "pg_files") {
186 if (i
== args
.begin() + 1) {
191 bool parsed
= pg
.parse(*i
);
193 std::cerr
<< "Invalid PG '" << *i
<< "'" << std::endl
;
196 pg_files_pgs
.insert(pg
);
203 // Fall through: unhandled
204 std::cerr
<< "Unknown argument '" << *i
<< "'" << std::endl
;
208 // If caller didn't specify a namespace, try to pick
209 // one if only one exists
210 if (fscid
== FS_CLUSTER_ID_NONE
) {
211 if (fsmap
->filesystem_count() == 1) {
212 fscid
= fsmap
->get_filesystem()->fscid
;
214 std::cerr
<< "Specify a filesystem with --filesystem" << std::endl
;
218 auto fs
= fsmap
->get_filesystem(fscid
);
219 ceph_assert(fs
!= nullptr);
221 // Default to output to metadata pool
222 if (driver
== NULL
) {
223 driver
= new MetadataDriver();
224 driver
->set_force_corrupt(force_corrupt
);
225 driver
->set_force_init(force_init
);
226 dout(4) << "Using metadata pool output" << dendl
;
229 dout(4) << "connecting to RADOS..." << dendl
;
232 std::cerr
<< "couldn't connect to cluster: " << cpp_strerror(r
)
237 r
= driver
->init(rados
, metadata_pool_name
, fsmap
, fscid
);
242 if (command
== "pg_files") {
243 auto pge
= PgFiles(objecter
, pg_files_pgs
);
245 return pge
.scan_path(pg_files_path
);
248 // Initialize data_io for those commands that need it
249 if (command
== "scan_inodes" ||
250 command
== "scan_extents" ||
251 command
== "cleanup") {
252 if (data_pool_name
.empty()) {
253 std::cerr
<< "Data pool not specified" << std::endl
;
257 data_pool_id
= rados
.pool_lookup(data_pool_name
.c_str());
258 if (data_pool_id
< 0) {
259 std::cerr
<< "Data pool '" << data_pool_name
<< "' not found!" << std::endl
;
262 dout(4) << "data pool '" << data_pool_name
263 << "' has ID " << data_pool_id
<< dendl
;
266 if (!fs
->mds_map
.is_data_pool(data_pool_id
)) {
267 std::cerr
<< "Warning: pool '" << data_pool_name
<< "' is not a "
268 "CephFS data pool!" << std::endl
;
270 std::cerr
<< "Use --force-pool to continue" << std::endl
;
275 dout(4) << "opening data pool '" << data_pool_name
<< "'" << dendl
;
276 r
= rados
.ioctx_create(data_pool_name
.c_str(), data_io
);
282 // Initialize metadata_io from MDSMap for scan_frags
283 if (command
== "scan_frags" || command
== "scan_links") {
284 const auto fs
= fsmap
->get_filesystem(fscid
);
286 std::cerr
<< "Filesystem id " << fscid
<< " does not exist" << std::endl
;
289 int64_t const metadata_pool_id
= fs
->mds_map
.get_metadata_pool();
291 dout(4) << "resolving metadata pool " << metadata_pool_id
<< dendl
;
292 int r
= rados
.pool_reverse_lookup(metadata_pool_id
, &metadata_pool_name
);
294 std::cerr
<< "Pool " << metadata_pool_id
295 << " identified in MDS map not found in RADOS!" << std::endl
;
299 r
= rados
.ioctx_create(metadata_pool_name
.c_str(), metadata_io
);
304 data_pools
= fs
->mds_map
.get_data_pools();
307 // Finally, dispatch command
308 if (command
== "scan_inodes") {
309 return scan_inodes();
310 } else if (command
== "scan_extents") {
311 return scan_extents();
312 } else if (command
== "scan_frags") {
314 } else if (command
== "scan_links") {
316 } else if (command
== "cleanup") {
318 } else if (command
== "init") {
319 return driver
->init_roots(fs
->mds_map
.get_first_data_pool());
321 std::cerr
<< "Unknown command '" << command
<< "'" << std::endl
;
326 int MetadataDriver::inject_unlinked_inode(
327 inodeno_t inono
, int mode
, int64_t data_pool_id
)
329 const object_t oid
= InodeStore::get_object_name(inono
, frag_t(), ".inode");
332 bool already_exists
= false;
333 int r
= root_exists(inono
, &already_exists
);
337 if (already_exists
&& !force_init
) {
338 std::cerr
<< "Inode 0x" << std::hex
<< inono
<< std::dec
<< " already"
339 " exists, skipping create. Use --force-init to overwrite"
340 " the existing object." << std::endl
;
346 inode
.inode
.ino
= inono
;
347 inode
.inode
.version
= 1;
348 inode
.inode
.xattr_version
= 1;
349 inode
.inode
.mode
= 0500 | mode
;
350 // Fake dirstat.nfiles to 1, so that the directory doesn't appear to be empty
351 // (we won't actually give the *correct* dirstat here though)
352 inode
.inode
.dirstat
.nfiles
= 1;
355 inode
.inode
.mtime
= ceph_clock_now();
356 inode
.inode
.nlink
= 1;
357 inode
.inode
.truncate_size
= -1ull;
358 inode
.inode
.truncate_seq
= 1;
359 inode
.inode
.uid
= g_conf()->mds_root_ino_uid
;
360 inode
.inode
.gid
= g_conf()->mds_root_ino_gid
;
362 // Force layout to default: should we let users override this so that
363 // they don't have to mount the filesystem to correct it?
364 inode
.inode
.layout
= file_layout_t::get_default();
365 inode
.inode
.layout
.pool_id
= data_pool_id
;
366 inode
.inode
.dir_layout
.dl_dir_hash
= g_conf()->mds_default_dir_hash
;
368 // Assume that we will get our stats wrong, and that we may
369 // be ignoring dirfrags that exist
370 inode
.damage_flags
|= (DAMAGE_STATS
| DAMAGE_RSTATS
| DAMAGE_FRAGTREE
);
372 if (inono
== CEPH_INO_ROOT
|| MDS_INO_IS_MDSDIR(inono
)) {
375 encode(srnode
, inode
.snap_blob
);
380 encode(std::string(CEPH_FS_ONDISK_MAGIC
), inode_bl
);
381 inode
.encode(inode_bl
, CEPH_FEATURES_SUPPORTED_DEFAULT
);
384 r
= metadata_io
.write_full(oid
.name
, inode_bl
);
386 derr
<< "Error writing '" << oid
.name
<< "': " << cpp_strerror(r
) << dendl
;
393 int MetadataDriver::root_exists(inodeno_t ino
, bool *result
)
395 object_t oid
= InodeStore::get_object_name(ino
, frag_t(), ".inode");
398 int r
= metadata_io
.stat(oid
.name
, &size
, &mtime
);
410 int MetadataDriver::init_roots(int64_t data_pool_id
)
413 r
= inject_unlinked_inode(CEPH_INO_ROOT
, S_IFDIR
|0755, data_pool_id
);
417 r
= inject_unlinked_inode(MDS_INO_MDSDIR(0), S_IFDIR
, data_pool_id
);
421 bool created
= false;
422 r
= find_or_create_dirfrag(MDS_INO_MDSDIR(0), frag_t(), &created
);
430 int MetadataDriver::check_roots(bool *result
)
433 r
= root_exists(CEPH_INO_ROOT
, result
);
441 r
= root_exists(MDS_INO_MDSDIR(0), result
);
456 * 0. Create root inodes if don't exist
457 * PARALLEL scan_extents
458 * 1. Size and mtime recovery: scan ALL objects, and update 0th
459 * objects with max size and max mtime seen.
460 * PARALLEL scan_inodes
461 * 2. Inode recovery: scan ONLY 0th objects, and inject metadata
462 * into dirfrag OMAPs, creating blank dirfrags as needed. No stats
463 * or rstats at this stage. Inodes without backtraces go into
465 * TODO: SERIAL "recover stats"
466 * 3. Dirfrag statistics: depth first traverse into metadata tree,
467 * rebuilding dir sizes.
468 * TODO PARALLEL "clean up"
469 * 4. Cleanup; go over all 0th objects (and dirfrags if we tagged
470 * anything onto them) and remove any of the xattrs that we
471 * used for accumulating.
475 int parse_oid(const std::string
&oid
, uint64_t *inode_no
, uint64_t *obj_id
)
477 if (oid
.find(".") == std::string::npos
|| oid
.find(".") == oid
.size() - 1) {
482 std::string inode_str
= oid
.substr(0, oid
.find("."));
483 *inode_no
= strict_strtoll(inode_str
.c_str(), 16, &err
);
488 std::string pos_string
= oid
.substr(oid
.find(".") + 1);
489 *obj_id
= strict_strtoll(pos_string
.c_str(), 16, &err
);
498 int DataScan::scan_extents()
500 return forall_objects(data_io
, false, [this](
501 std::string
const &oid
,
502 uint64_t obj_name_ino
,
503 uint64_t obj_name_offset
) -> int
508 int r
= data_io
.stat(oid
, &size
, &mtime
);
509 dout(10) << "handling object " << obj_name_ino
510 << "." << obj_name_offset
<< dendl
;
512 dout(4) << "Cannot stat '" << oid
<< "': skipping" << dendl
;
516 // I need to keep track of
517 // * The highest object ID seen
518 // * The size of the highest object ID seen
519 // * The largest object seen
521 // Given those things, I can later infer the object chunking
522 // size, the offset of the last object (chunk size * highest ID seen)
523 // and the actual size (offset of last object + size of highest ID seen)
525 // This logic doesn't take account of striping.
526 r
= ClsCephFSClient::accumulate_inode_metadata(
533 derr
<< "Failed to accumulate metadata data from '"
534 << oid
<< "': " << cpp_strerror(r
) << dendl
;
542 int DataScan::probe_filter(librados::IoCtx
&ioctx
)
544 bufferlist filter_bl
;
545 ClsCephFSClient::build_tag_filter("test", &filter_bl
);
546 librados::ObjectCursor range_i
;
547 librados::ObjectCursor range_end
;
549 std::vector
<librados::ObjectItem
> tmp_result
;
550 librados::ObjectCursor tmp_next
;
551 int r
= ioctx
.object_list(ioctx
.object_list_begin(), ioctx
.object_list_end(),
552 1, filter_bl
, &tmp_result
, &tmp_next
);
557 int DataScan::forall_objects(
558 librados::IoCtx
&ioctx
,
560 std::function
<int(std::string
, uint64_t, uint64_t)> handler
563 librados::ObjectCursor range_i
;
564 librados::ObjectCursor range_end
;
565 ioctx
.object_list_slice(
566 ioctx
.object_list_begin(),
567 ioctx
.object_list_end(),
574 bufferlist filter_bl
;
576 bool legacy_filtering
= false;
578 // probe to deal with older OSDs that don't support
579 // the cephfs pgls filtering mode
580 legacy_filtering
= !probe_filter(ioctx
);
581 if (!legacy_filtering
) {
582 ClsCephFSClient::build_tag_filter(filter_tag
, &filter_bl
);
587 while(range_i
< range_end
) {
588 std::vector
<librados::ObjectItem
> result
;
589 int r
= ioctx
.object_list(range_i
, range_end
, 1,
590 filter_bl
, &result
, &range_i
);
592 derr
<< "Unexpected error listing objects: " << cpp_strerror(r
) << dendl
;
596 for (const auto &i
: result
) {
597 const std::string
&oid
= i
.oid
;
598 uint64_t obj_name_ino
= 0;
599 uint64_t obj_name_offset
= 0;
600 r
= parse_oid(oid
, &obj_name_ino
, &obj_name_offset
);
602 dout(4) << "Bad object name '" << oid
<< "', skipping" << dendl
;
606 if (untagged_only
&& legacy_filtering
) {
607 dout(20) << "Applying filter to " << oid
<< dendl
;
609 // We are only interested in 0th objects during this phase: we touched
610 // the other objects during scan_extents
611 if (obj_name_offset
!= 0) {
612 dout(20) << "Non-zeroth object" << dendl
;
616 bufferlist scrub_tag_bl
;
617 int r
= ioctx
.getxattr(oid
, "scrub_tag", scrub_tag_bl
);
619 std::string read_tag
;
620 auto q
= scrub_tag_bl
.cbegin();
623 if (read_tag
== filter_tag
) {
624 dout(20) << "skipping " << oid
<< " because it has the filter_tag"
628 } catch (const buffer::error
&err
) {
630 dout(20) << "read non-matching tag '" << read_tag
<< "'" << dendl
;
632 dout(20) << "no tag read (" << r
<< ")" << dendl
;
635 } else if (untagged_only
) {
636 ceph_assert(obj_name_offset
== 0);
637 dout(20) << "OSD matched oid " << oid
<< dendl
;
640 int this_oid_r
= handler(oid
, obj_name_ino
, obj_name_offset
);
641 if (r
== 0 && this_oid_r
< 0) {
650 int DataScan::scan_inodes()
653 int r
= driver
->check_roots(&roots_present
);
655 derr
<< "Unexpected error checking roots: '"
656 << cpp_strerror(r
) << "'" << dendl
;
660 if (!roots_present
) {
661 std::cerr
<< "Some or all system inodes are absent. Run 'init' from "
662 "one node before running 'scan_inodes'" << std::endl
;
666 return forall_objects(data_io
, true, [this](
667 std::string
const &oid
,
668 uint64_t obj_name_ino
,
669 uint64_t obj_name_offset
) -> int
673 dout(10) << "handling object "
674 << std::hex
<< obj_name_ino
<< "." << obj_name_offset
<< std::dec
677 AccumulateResult accum_res
;
678 inode_backtrace_t backtrace
;
679 file_layout_t loaded_layout
= file_layout_t::get_default();
680 r
= ClsCephFSClient::fetch_inode_accumulate_result(
681 data_io
, oid
, &backtrace
, &loaded_layout
, &accum_res
);
684 dout(4) << "Accumulated metadata missing from '"
685 << oid
<< ", did you run scan_extents?" << dendl
;
688 dout(4) << "Unexpected error loading accumulated metadata from '"
689 << oid
<< "': " << cpp_strerror(r
) << dendl
;
690 // FIXME: this creates situation where if a client has a corrupt
691 // backtrace/layout, we will fail to inject it. We should (optionally)
692 // proceed if the backtrace/layout is corrupt but we have valid
693 // accumulated metadata.
697 const time_t file_mtime
= accum_res
.max_mtime
;
698 uint64_t file_size
= 0;
699 bool have_backtrace
= !(backtrace
.ancestors
.empty());
701 // This is the layout we will use for injection, populated either
702 // from loaded_layout or from best guesses
703 file_layout_t guessed_layout
;
704 guessed_layout
.pool_id
= data_pool_id
;
706 // Calculate file_size, guess the layout
707 if (accum_res
.ceiling_obj_index
> 0) {
708 uint32_t chunk_size
= file_layout_t::get_default().object_size
;
709 // When there are multiple objects, the largest object probably
710 // indicates the chunk size. But not necessarily, because files
711 // can be sparse. Only make this assumption if size seen
712 // is a power of two, as chunk sizes typically are.
713 if ((accum_res
.max_obj_size
& (accum_res
.max_obj_size
- 1)) == 0) {
714 chunk_size
= accum_res
.max_obj_size
;
717 if (loaded_layout
.pool_id
== -1) {
718 // If no stashed layout was found, guess it
719 guessed_layout
.object_size
= chunk_size
;
720 guessed_layout
.stripe_unit
= chunk_size
;
721 guessed_layout
.stripe_count
= 1;
722 } else if (!loaded_layout
.is_valid() ||
723 loaded_layout
.object_size
< accum_res
.max_obj_size
) {
724 // If the max size seen exceeds what the stashed layout claims, then
725 // disbelieve it. Guess instead. Same for invalid layouts on disk.
726 dout(4) << "bogus xattr layout on 0x" << std::hex
<< obj_name_ino
727 << std::dec
<< ", ignoring in favour of best guess" << dendl
;
728 guessed_layout
.object_size
= chunk_size
;
729 guessed_layout
.stripe_unit
= chunk_size
;
730 guessed_layout
.stripe_count
= 1;
732 // We have a stashed layout that we can't disprove, so apply it
733 guessed_layout
= loaded_layout
;
734 dout(20) << "loaded layout from xattr:"
735 << " os: " << guessed_layout
.object_size
736 << " sc: " << guessed_layout
.stripe_count
737 << " su: " << guessed_layout
.stripe_unit
739 // User might have transplanted files from a pool with a different
740 // ID, so whatever the loaded_layout says, we'll force the injected
741 // layout to point to the pool we really read from
742 guessed_layout
.pool_id
= data_pool_id
;
745 if (guessed_layout
.stripe_count
== 1) {
746 // Unstriped file: simple chunking
747 file_size
= guessed_layout
.object_size
* accum_res
.ceiling_obj_index
748 + accum_res
.ceiling_obj_size
;
750 // Striped file: need to examine the last stripe_count objects
751 // in the file to determine the size.
753 // How many complete (i.e. not last stripe) objects?
754 uint64_t complete_objs
= 0;
755 if (accum_res
.ceiling_obj_index
> guessed_layout
.stripe_count
- 1) {
756 complete_objs
= (accum_res
.ceiling_obj_index
/ guessed_layout
.stripe_count
) * guessed_layout
.stripe_count
;
761 // How many potentially-short objects (i.e. last stripe set) objects?
762 uint64_t partial_objs
= accum_res
.ceiling_obj_index
+ 1 - complete_objs
;
764 dout(10) << "calculating striped size from complete objs: "
765 << complete_objs
<< ", partial objs: " << partial_objs
768 // Maximum amount of data that may be in the incomplete objects
769 uint64_t incomplete_size
= 0;
771 // For each short object, calculate the max file size within it
772 // and accumulate the maximum
773 for (uint64_t i
= complete_objs
; i
< complete_objs
+ partial_objs
; ++i
) {
775 snprintf(buf
, sizeof(buf
), "%llx.%08llx",
776 (long long unsigned)obj_name_ino
, (long long unsigned)i
);
780 r
= data_io
.stat(std::string(buf
), &osize
, &omtime
);
783 // Upper bound within this object
784 uint64_t upper_size
= (osize
- 1) / guessed_layout
.stripe_unit
785 * (guessed_layout
.stripe_unit
* guessed_layout
.stripe_count
)
786 + (i
% guessed_layout
.stripe_count
)
787 * guessed_layout
.stripe_unit
+ (osize
- 1)
788 % guessed_layout
.stripe_unit
+ 1;
789 incomplete_size
= std::max(incomplete_size
, upper_size
);
791 } else if (r
== -ENOENT
) {
792 // Absent object, treat as size 0 and ignore.
794 // Unexpected error, carry r to outer scope for handling.
798 if (r
!= 0 && r
!= -ENOENT
) {
799 derr
<< "Unexpected error checking size of ino 0x" << std::hex
800 << obj_name_ino
<< std::dec
<< ": " << cpp_strerror(r
) << dendl
;
803 file_size
= complete_objs
* guessed_layout
.object_size
807 file_size
= accum_res
.ceiling_obj_size
;
808 if (loaded_layout
.pool_id
< 0
809 || loaded_layout
.object_size
< accum_res
.max_obj_size
) {
810 // No layout loaded, or inconsistent layout, use default
811 guessed_layout
= file_layout_t::get_default();
812 guessed_layout
.pool_id
= data_pool_id
;
814 guessed_layout
= loaded_layout
;
818 // Santity checking backtrace ino against object name
819 if (have_backtrace
&& backtrace
.ino
!= obj_name_ino
) {
820 dout(4) << "Backtrace ino 0x" << std::hex
<< backtrace
.ino
821 << " doesn't match object name ino 0x" << obj_name_ino
822 << std::dec
<< dendl
;
823 have_backtrace
= false;
827 build_file_dentry(obj_name_ino
, file_size
, file_mtime
, guessed_layout
, &dentry
);
829 // Inject inode to the metadata pool
830 if (have_backtrace
) {
831 inode_backpointer_t root_bp
= *(backtrace
.ancestors
.rbegin());
832 if (MDS_INO_IS_MDSDIR(root_bp
.dirino
)) {
833 /* Special case for strays: even if we have a good backtrace,
834 * don't put it in the stray dir, because while that would technically
835 * give it linkage it would still be invisible to the user */
836 r
= driver
->inject_lost_and_found(obj_name_ino
, dentry
);
838 dout(4) << "Error injecting 0x" << std::hex
<< backtrace
.ino
839 << std::dec
<< " into lost+found: " << cpp_strerror(r
) << dendl
;
841 dout(4) << "Use --force-corrupt to overwrite structures that "
842 "appear to be corrupt" << dendl
;
846 /* Happy case: we will inject a named dentry for this inode */
847 r
= driver
->inject_with_backtrace(backtrace
, dentry
);
849 dout(4) << "Error injecting 0x" << std::hex
<< backtrace
.ino
850 << std::dec
<< " with backtrace: " << cpp_strerror(r
) << dendl
;
852 dout(4) << "Use --force-corrupt to overwrite structures that "
853 "appear to be corrupt" << dendl
;
858 /* Backtrace-less case: we will inject a lost+found dentry */
859 r
= driver
->inject_lost_and_found(
860 obj_name_ino
, dentry
);
862 dout(4) << "Error injecting 0x" << std::hex
<< obj_name_ino
863 << std::dec
<< " into lost+found: " << cpp_strerror(r
) << dendl
;
865 dout(4) << "Use --force-corrupt to overwrite structures that "
866 "appear to be corrupt" << dendl
;
875 int DataScan::cleanup()
877 // We are looking for only zeroth object
879 return forall_objects(data_io
, true, [this](
880 std::string
const &oid
,
881 uint64_t obj_name_ino
,
882 uint64_t obj_name_offset
) -> int
885 r
= ClsCephFSClient::delete_inode_accumulate_result(data_io
, oid
);
887 dout(4) << "Error deleting accumulated metadata from '"
888 << oid
<< "': " << cpp_strerror(r
) << dendl
;
894 bool DataScan::valid_ino(inodeno_t ino
) const
896 return (ino
>= inodeno_t((1ull << 40)))
897 || (MDS_INO_IS_STRAY(ino
))
898 || (MDS_INO_IS_MDSDIR(ino
))
899 || ino
== CEPH_INO_ROOT
900 || ino
== CEPH_INO_CEPH
;
903 int DataScan::scan_links()
905 MetadataDriver
*metadata_driver
= dynamic_cast<MetadataDriver
*>(driver
);
906 if (!metadata_driver
) {
907 derr
<< "Unexpected --output-dir option for scan_links" << dendl
;
911 interval_set
<uint64_t> used_inos
;
912 map
<inodeno_t
, int> remote_links
;
913 map
<snapid_t
, SnapInfo
> snaps
;
914 snapid_t last_snap
= 1;
915 snapid_t snaprealm_v2_since
= 2;
924 map
<snapid_t
, SnapInfo
> snaps
;
925 link_info_t() : version(0), nlink(0), is_dir(false) {}
926 link_info_t(inodeno_t di
, frag_t df
, const string
& n
, const CInode::mempool_inode
& i
) :
927 dirino(di
), frag(df
), name(n
),
928 version(i
.version
), nlink(i
.nlink
), is_dir(S_IFDIR
& i
.mode
) {}
929 dirfrag_t
dirfrag() const {
930 return dirfrag_t(dirino
, frag
);
933 map
<inodeno_t
, list
<link_info_t
> > dup_primaries
;
934 map
<inodeno_t
, link_info_t
> bad_nlink_inos
;
935 map
<inodeno_t
, link_info_t
> injected_inos
;
937 map
<dirfrag_t
, set
<string
> > to_remove
;
944 for (int step
= SCAN_INOS
; step
<= CHECK_LINK
; step
++) {
945 const librados::NObjectIterator it_end
= metadata_io
.nobjects_end();
946 for (auto it
= metadata_io
.nobjects_begin(); it
!= it_end
; ++it
) {
947 const std::string oid
= it
->get_oid();
949 uint64_t dir_ino
= 0;
950 uint64_t frag_id
= 0;
951 int r
= parse_oid(oid
, &dir_ino
, &frag_id
);
953 dout(10) << "Not a dirfrag: '" << oid
<< "'" << dendl
;
956 // parse_oid can only do 0 or -EINVAL
960 if (!valid_ino(dir_ino
)) {
961 dout(10) << "Not a dirfrag (invalid ino): '" << oid
<< "'" << dendl
;
965 std::map
<std::string
, bufferlist
> items
;
966 r
= metadata_io
.omap_get_vals(oid
, "", (uint64_t)-1, &items
);
968 derr
<< "Error getting omap from '" << oid
<< "': " << cpp_strerror(r
) << dendl
;
972 for (auto& p
: items
) {
973 auto q
= p
.second
.cbegin();
976 dentry_key_t::decode_helper(p
.first
, dname
, last
);
978 if (last
!= CEPH_NOSNAP
) {
979 if (last
> last_snap
)
987 if (dnfirst
<= CEPH_MAXSNAP
) {
988 if (dnfirst
- 1 > last_snap
)
989 last_snap
= dnfirst
- 1;
992 decode(dentry_type
, q
);
993 if (dentry_type
== 'I') {
995 inode
.decode_bare(q
);
996 inodeno_t ino
= inode
.inode
.ino
;
998 if (step
== SCAN_INOS
) {
999 if (used_inos
.contains(ino
, 1)) {
1000 dup_primaries
[ino
].size();
1002 used_inos
.insert(ino
);
1004 } else if (step
== CHECK_LINK
) {
1006 if (inode
.snap_blob
.length()) {
1007 auto p
= inode
.snap_blob
.cbegin();
1009 for (auto it
= srnode
.snaps
.begin();
1010 it
!= srnode
.snaps
.end(); ) {
1011 if (it
->second
.ino
!= ino
||
1012 it
->second
.snapid
!= it
->first
) {
1013 srnode
.snaps
.erase(it
++);
1018 if (!srnode
.past_parents
.empty()) {
1019 snapid_t last
= srnode
.past_parents
.rbegin()->first
;
1020 if (last
+ 1 > snaprealm_v2_since
)
1021 snaprealm_v2_since
= last
+ 1;
1024 if (!inode
.old_inodes
.empty()) {
1025 if (inode
.old_inodes
.rbegin()->first
> last_snap
)
1026 last_snap
= inode
.old_inodes
.rbegin()->first
;
1028 auto q
= dup_primaries
.find(ino
);
1029 if (q
!= dup_primaries
.end()) {
1030 q
->second
.push_back(link_info_t(dir_ino
, frag_id
, dname
, inode
.inode
));
1031 q
->second
.back().snaps
.swap(srnode
.snaps
);
1034 auto r
= remote_links
.find(ino
);
1035 if (r
!= remote_links
.end())
1037 if (!MDS_INO_IS_STRAY(dir_ino
))
1039 if (inode
.inode
.nlink
!= nlink
) {
1040 derr
<< "Bad nlink on " << ino
<< " expected " << nlink
1041 << " has " << inode
.inode
.nlink
<< dendl
;
1042 bad_nlink_inos
[ino
] = link_info_t(dir_ino
, frag_id
, dname
, inode
.inode
);
1043 bad_nlink_inos
[ino
].nlink
= nlink
;
1045 snaps
.insert(make_move_iterator(begin(srnode
.snaps
)),
1046 make_move_iterator(end(srnode
.snaps
)));
1048 if (dnfirst
== CEPH_NOSNAP
)
1049 injected_inos
[ino
] = link_info_t(dir_ino
, frag_id
, dname
, inode
.inode
);
1051 } else if (dentry_type
== 'L') {
1053 unsigned char d_type
;
1057 if (step
== SCAN_INOS
) {
1058 remote_links
[ino
]++;
1059 } else if (step
== CHECK_LINK
) {
1060 if (!used_inos
.contains(ino
, 1)) {
1061 derr
<< "Bad remote link dentry 0x" << std::hex
<< dir_ino
1062 << std::dec
<< "/" << dname
1063 << ", ino " << ino
<< " not found" << dendl
;
1065 dentry_key_t
dn_key(CEPH_NOSNAP
, dname
.c_str());
1067 to_remove
[dirfrag_t(dir_ino
, frag_id
)].insert(key
);
1071 derr
<< "Invalid tag char '" << dentry_type
<< "' dentry 0x" << dir_ino
1072 << std::dec
<< "/" << dname
<< dendl
;
1075 } catch (const buffer::error
&err
) {
1076 derr
<< "Error decoding dentry 0x" << std::hex
<< dir_ino
1077 << std::dec
<< "/" << dname
<< dendl
;
1084 map
<unsigned, uint64_t> max_ino_map
;
1086 auto prev_max_ino
= (uint64_t)1 << 40;
1087 for (auto p
= used_inos
.begin(); p
!= used_inos
.end(); ++p
) {
1088 auto cur_max
= p
.get_start() + p
.get_len() - 1;
1089 if (cur_max
< prev_max_ino
)
1090 continue; // system inodes
1092 if ((prev_max_ino
>> 40) != (cur_max
>> 40)) {
1093 unsigned rank
= (prev_max_ino
>> 40) - 1;
1094 max_ino_map
[rank
] = prev_max_ino
;
1095 } else if ((p
.get_start() >> 40) != (cur_max
>> 40)) {
1096 unsigned rank
= (p
.get_start() >> 40) - 1;
1097 max_ino_map
[rank
] = ((uint64_t)(rank
+ 2) << 40) - 1;
1099 prev_max_ino
= cur_max
;
1101 unsigned rank
= (prev_max_ino
>> 40) - 1;
1102 max_ino_map
[rank
] = prev_max_ino
;
1107 for (auto& p
: dup_primaries
) {
1109 for (auto& q
: p
.second
) {
1110 if (q
.version
> newest
.version
) {
1112 } else if (q
.version
== newest
.version
&&
1113 !MDS_INO_IS_STRAY(q
.dirino
) &&
1114 MDS_INO_IS_STRAY(newest
.dirino
)) {
1119 for (auto& q
: p
.second
) {
1120 // in the middle of dir fragmentation?
1121 if (newest
.dirino
== q
.dirino
&& newest
.name
== q
.name
) {
1122 snaps
.insert(make_move_iterator(begin(q
.snaps
)),
1123 make_move_iterator(end(q
.snaps
)));
1128 dentry_key_t
dn_key(CEPH_NOSNAP
, q
.name
.c_str());
1130 to_remove
[q
.dirfrag()].insert(key
);
1131 derr
<< "Remove duplicated ino 0x" << p
.first
<< " from "
1132 << q
.dirfrag() << "/" << q
.name
<< dendl
;
1136 auto q
= remote_links
.find(p
.first
);
1137 if (q
!= remote_links
.end())
1139 if (!MDS_INO_IS_STRAY(newest
.dirino
))
1142 if (nlink
!= newest
.nlink
) {
1143 derr
<< "Bad nlink on " << p
.first
<< " expected " << nlink
1144 << " has " << newest
.nlink
<< dendl
;
1145 bad_nlink_inos
[p
.first
] = newest
;
1146 bad_nlink_inos
[p
.first
].nlink
= nlink
;
1149 dup_primaries
.clear();
1150 remote_links
.clear();
1153 objecter
->with_osdmap([&](const OSDMap
& o
) {
1154 for (auto p
: data_pools
) {
1155 const pg_pool_t
*pi
= o
.get_pg_pool(p
);
1158 if (pi
->snap_seq
> last_snap
)
1159 last_snap
= pi
->snap_seq
;
1163 if (!snaps
.empty()) {
1164 if (snaps
.rbegin()->first
> last_snap
)
1165 last_snap
= snaps
.rbegin()->first
;
1169 for (auto& p
: to_remove
) {
1170 object_t frag_oid
= InodeStore::get_object_name(p
.first
.ino
, p
.first
.frag
, "");
1172 int r
= metadata_io
.omap_rm_keys(frag_oid
.name
, p
.second
);
1174 derr
<< "Error removing duplicated dentries from " << p
.first
<< dendl
;
1180 for (auto &p
: bad_nlink_inos
) {
1183 int r
= read_dentry(p
.second
.dirino
, p
.second
.frag
, p
.second
.name
, &inode
, &first
);
1185 derr
<< "Unexpected error reading dentry "
1186 << p
.second
.dirfrag() << "/" << p
.second
.name
1187 << ": " << cpp_strerror(r
) << dendl
;
1191 if (inode
.inode
.ino
!= p
.first
|| inode
.inode
.version
!= p
.second
.version
)
1194 inode
.inode
.nlink
= p
.second
.nlink
;
1195 r
= metadata_driver
->inject_linkage(p
.second
.dirino
, p
.second
.name
, p
.second
.frag
, inode
, first
);
1200 for (auto &p
: injected_inos
) {
1203 int r
= read_dentry(p
.second
.dirino
, p
.second
.frag
, p
.second
.name
, &inode
, &first
);
1205 derr
<< "Unexpected error reading dentry "
1206 << p
.second
.dirfrag() << "/" << p
.second
.name
1207 << ": " << cpp_strerror(r
) << dendl
;
1211 if (first
!= CEPH_NOSNAP
)
1214 first
= last_snap
+ 1;
1215 r
= metadata_driver
->inject_linkage(p
.second
.dirino
, p
.second
.name
, p
.second
.frag
, inode
, first
);
1220 for (auto& p
: max_ino_map
) {
1221 InoTable
inotable(nullptr);
1222 inotable
.set_rank(p
.first
);
1224 int r
= metadata_driver
->load_table(&inotable
);
1226 inotable
.reset_state();
1229 if (inotable
.force_consume_to(p
.second
))
1232 r
= metadata_driver
->save_table(&inotable
);
1239 SnapServer snaptable
;
1240 snaptable
.set_rank(0);
1242 int r
= metadata_driver
->load_table(&snaptable
);
1244 snaptable
.reset_state();
1247 if (snaptable
.force_update(last_snap
, snaprealm_v2_since
, snaps
))
1250 r
= metadata_driver
->save_table(&snaptable
);
1258 int DataScan::scan_frags()
1261 int r
= driver
->check_roots(&roots_present
);
1263 derr
<< "Unexpected error checking roots: '"
1264 << cpp_strerror(r
) << "'" << dendl
;
1268 if (!roots_present
) {
1269 std::cerr
<< "Some or all system inodes are absent. Run 'init' from "
1270 "one node before running 'scan_inodes'" << std::endl
;
1274 return forall_objects(metadata_io
, true, [this](
1275 std::string
const &oid
,
1276 uint64_t obj_name_ino
,
1277 uint64_t obj_name_offset
) -> int
1280 r
= parse_oid(oid
, &obj_name_ino
, &obj_name_offset
);
1282 dout(4) << "Bad object name '" << oid
<< "', skipping" << dendl
;
1286 if (obj_name_ino
< (1ULL << 40)) {
1287 // FIXME: we're skipping stray dirs here: if they're
1288 // orphaned then we should be resetting them some other
1290 dout(10) << "Skipping system ino " << obj_name_ino
<< dendl
;
1294 AccumulateResult accum_res
;
1295 inode_backtrace_t backtrace
;
1297 // Default to inherit layout (i.e. no explicit layout on dir) which is
1298 // expressed as a zeroed layout struct (see inode_t::has_layout)
1299 file_layout_t loaded_layout
;
1302 bufferlist parent_bl
;
1304 bufferlist layout_bl
;
1307 librados::ObjectReadOperation op
;
1308 op
.getxattr("parent", &parent_bl
, &parent_r
);
1309 op
.getxattr("layout", &layout_bl
, &layout_r
);
1310 r
= metadata_io
.operate(oid
, &op
, &op_bl
);
1311 if (r
!= 0 && r
!= -ENODATA
) {
1312 derr
<< "Unexpected error reading backtrace: " << cpp_strerror(parent_r
) << dendl
;
1316 if (parent_r
!= -ENODATA
) {
1318 auto q
= parent_bl
.cbegin();
1319 backtrace
.decode(q
);
1320 } catch (buffer::error
&e
) {
1321 dout(4) << "Corrupt backtrace on '" << oid
<< "': " << e
<< dendl
;
1322 if (!force_corrupt
) {
1325 // Treat backtrace as absent: we'll inject into lost+found
1326 backtrace
= inode_backtrace_t();
1331 if (layout_r
!= -ENODATA
) {
1333 auto q
= layout_bl
.cbegin();
1334 decode(loaded_layout
, q
);
1335 } catch (buffer::error
&e
) {
1336 dout(4) << "Corrupt layout on '" << oid
<< "': " << e
<< dendl
;
1337 if (!force_corrupt
) {
1343 bool have_backtrace
= !(backtrace
.ancestors
.empty());
1345 // Santity checking backtrace ino against object name
1346 if (have_backtrace
&& backtrace
.ino
!= obj_name_ino
) {
1347 dout(4) << "Backtrace ino 0x" << std::hex
<< backtrace
.ino
1348 << " doesn't match object name ino 0x" << obj_name_ino
1349 << std::dec
<< dendl
;
1350 have_backtrace
= false;
1353 uint64_t fnode_version
= 0;
1355 r
= read_fnode(obj_name_ino
, frag_t(), &fnode
, &fnode_version
);
1357 derr
<< "Corrupt fnode on " << oid
<< dendl
;
1358 if (force_corrupt
) {
1359 fnode
.fragstat
.mtime
= 0;
1360 fnode
.fragstat
.nfiles
= 1;
1361 fnode
.fragstat
.nsubdirs
= 0;
1362 fnode
.accounted_fragstat
= fnode
.fragstat
;
1369 build_dir_dentry(obj_name_ino
, fnode
.accounted_fragstat
,
1370 loaded_layout
, &dentry
);
1372 // Inject inode to the metadata pool
1373 if (have_backtrace
) {
1374 inode_backpointer_t root_bp
= *(backtrace
.ancestors
.rbegin());
1375 if (MDS_INO_IS_MDSDIR(root_bp
.dirino
)) {
1376 /* Special case for strays: even if we have a good backtrace,
1377 * don't put it in the stray dir, because while that would technically
1378 * give it linkage it would still be invisible to the user */
1379 r
= driver
->inject_lost_and_found(obj_name_ino
, dentry
);
1381 dout(4) << "Error injecting 0x" << std::hex
<< backtrace
.ino
1382 << std::dec
<< " into lost+found: " << cpp_strerror(r
) << dendl
;
1384 dout(4) << "Use --force-corrupt to overwrite structures that "
1385 "appear to be corrupt" << dendl
;
1389 /* Happy case: we will inject a named dentry for this inode */
1390 r
= driver
->inject_with_backtrace(backtrace
, dentry
);
1392 dout(4) << "Error injecting 0x" << std::hex
<< backtrace
.ino
1393 << std::dec
<< " with backtrace: " << cpp_strerror(r
) << dendl
;
1395 dout(4) << "Use --force-corrupt to overwrite structures that "
1396 "appear to be corrupt" << dendl
;
1401 /* Backtrace-less case: we will inject a lost+found dentry */
1402 r
= driver
->inject_lost_and_found(
1403 obj_name_ino
, dentry
);
1405 dout(4) << "Error injecting 0x" << std::hex
<< obj_name_ino
1406 << std::dec
<< " into lost+found: " << cpp_strerror(r
) << dendl
;
1408 dout(4) << "Use --force-corrupt to overwrite structures that "
1409 "appear to be corrupt" << dendl
;
1418 int MetadataTool::read_fnode(
1419 inodeno_t ino
, frag_t frag
, fnode_t
*fnode
,
1420 uint64_t *last_version
)
1422 ceph_assert(fnode
!= NULL
);
1424 object_t frag_oid
= InodeStore::get_object_name(ino
, frag
, "");
1425 bufferlist fnode_bl
;
1426 int r
= metadata_io
.omap_get_header(frag_oid
.name
, &fnode_bl
);
1427 *last_version
= metadata_io
.get_last_version();
1432 auto old_fnode_iter
= fnode_bl
.cbegin();
1434 (*fnode
).decode(old_fnode_iter
);
1435 } catch (const buffer::error
&err
) {
1442 int MetadataTool::read_dentry(inodeno_t parent_ino
, frag_t frag
,
1443 const std::string
&dname
, InodeStore
*inode
, snapid_t
*dnfirst
)
1445 ceph_assert(inode
!= NULL
);
1448 dentry_key_t
dn_key(CEPH_NOSNAP
, dname
.c_str());
1451 std::set
<std::string
> keys
;
1453 std::map
<std::string
, bufferlist
> vals
;
1454 object_t frag_oid
= InodeStore::get_object_name(parent_ino
, frag
, "");
1455 int r
= metadata_io
.omap_get_vals_by_keys(frag_oid
.name
, keys
, &vals
);
1456 dout(20) << "oid=" << frag_oid
.name
1457 << " dname=" << dname
1459 << ", r=" << r
<< dendl
;
1464 if (vals
.find(key
) == vals
.end()) {
1465 dout(20) << key
<< " not found in result" << dendl
;
1470 auto q
= vals
[key
].cbegin();
1474 decode(dentry_type
, q
);
1475 if (dentry_type
== 'I') {
1476 inode
->decode_bare(q
);
1478 dout(20) << "dentry type '" << dentry_type
<< "': cannot"
1479 "read an inode out of that" << dendl
;
1484 } catch (const buffer::error
&err
) {
1485 dout(20) << "encoding error in dentry 0x" << std::hex
<< parent_ino
1486 << std::dec
<< "/" << dname
<< dendl
;
1493 int MetadataDriver::load_table(MDSTable
*table
)
1495 object_t table_oid
= table
->get_object_name();
1497 bufferlist table_bl
;
1498 int r
= metadata_io
.read(table_oid
.name
, table_bl
, 0, 0);
1500 derr
<< "unable to read mds table '" << table_oid
.name
<< "': "
1501 << cpp_strerror(r
) << dendl
;
1506 version_t table_ver
;
1507 auto p
= table_bl
.cbegin();
1508 decode(table_ver
, p
);
1509 table
->decode_state(p
);
1510 table
->force_replay_version(table_ver
);
1511 } catch (const buffer::error
&err
) {
1512 derr
<< "unable to decode mds table '" << table_oid
.name
<< "': "
1513 << err
.what() << dendl
;
1519 int MetadataDriver::save_table(MDSTable
*table
)
1521 object_t table_oid
= table
->get_object_name();
1523 bufferlist table_bl
;
1524 encode(table
->get_version(), table_bl
);
1525 table
->encode_state(table_bl
);
1526 int r
= metadata_io
.write_full(table_oid
.name
, table_bl
);
1528 derr
<< "error updating mds table " << table_oid
.name
1529 << ": " << cpp_strerror(r
) << dendl
;
1535 int MetadataDriver::inject_lost_and_found(
1536 inodeno_t ino
, const InodeStore
&dentry
)
1538 // Create lost+found if doesn't exist
1539 bool created
= false;
1540 int r
= find_or_create_dirfrag(CEPH_INO_ROOT
, frag_t(), &created
);
1545 r
= read_dentry(CEPH_INO_ROOT
, frag_t(), "lost+found", &lf_ino
);
1546 if (r
== -ENOENT
|| r
== -EINVAL
) {
1547 if (r
== -EINVAL
&& !force_corrupt
) {
1551 // To have a directory not specify a layout, give it zeros (see
1552 // inode_t::has_layout)
1553 file_layout_t inherit_layout
;
1555 // Construct LF inode
1556 frag_info_t fragstat
;
1557 fragstat
.nfiles
= 1,
1558 build_dir_dentry(CEPH_INO_LOST_AND_FOUND
, fragstat
, inherit_layout
, &lf_ino
);
1560 // Inject link to LF inode in the root dir
1561 r
= inject_linkage(CEPH_INO_ROOT
, "lost+found", frag_t(), lf_ino
);
1566 if (!(lf_ino
.inode
.mode
& S_IFDIR
)) {
1567 derr
<< "lost+found exists but is not a directory!" << dendl
;
1568 // In this case we error out, and the user should do something about
1574 r
= find_or_create_dirfrag(CEPH_INO_LOST_AND_FOUND
, frag_t(), &created
);
1579 InodeStore recovered_ino
;
1582 const std::string dname
= lost_found_dname(ino
);
1584 // Write dentry into lost+found dirfrag
1585 return inject_linkage(lf_ino
.inode
.ino
, dname
, frag_t(), dentry
);
1589 int MetadataDriver::get_frag_of(
1591 const std::string
&target_dname
,
1594 object_t root_frag_oid
= InodeStore::get_object_name(dirino
, frag_t(), "");
1596 dout(20) << "dirino=" << dirino
<< " target_dname=" << target_dname
<< dendl
;
1598 // Find and load fragtree if existing dirfrag
1599 // ==========================================
1600 bool have_backtrace
= false;
1601 bufferlist parent_bl
;
1602 int r
= metadata_io
.getxattr(root_frag_oid
.name
, "parent", parent_bl
);
1603 if (r
== -ENODATA
) {
1604 dout(10) << "No backtrace on '" << root_frag_oid
<< "'" << dendl
;
1606 dout(4) << "Unexpected error on '" << root_frag_oid
<< "': "
1607 << cpp_strerror(r
) << dendl
;
1611 // Deserialize backtrace
1612 inode_backtrace_t backtrace
;
1613 if (parent_bl
.length()) {
1615 auto q
= parent_bl
.cbegin();
1616 backtrace
.decode(q
);
1617 have_backtrace
= true;
1618 } catch (buffer::error
&e
) {
1619 dout(4) << "Corrupt backtrace on '" << root_frag_oid
<< "': " << e
<< dendl
;
1623 if (!(have_backtrace
&& backtrace
.ancestors
.size())) {
1624 // Can't work out fragtree without a backtrace
1625 dout(4) << "No backtrace on '" << root_frag_oid
1626 << "': cannot determine fragtree" << dendl
;
1630 // The parentage of dirino
1631 const inode_backpointer_t
&bp
= *(backtrace
.ancestors
.begin());
1633 // The inode of dirino's parent
1634 const inodeno_t parent_ino
= bp
.dirino
;
1636 // The dname of dirino in its parent.
1637 const std::string
&parent_dname
= bp
.dname
;
1639 dout(20) << "got backtrace parent " << parent_ino
<< "/"
1640 << parent_dname
<< dendl
;
1642 // The primary dentry for dirino
1643 InodeStore existing_dentry
;
1645 // See if we can find ourselves in dirfrag zero of the parent: this
1646 // is a fast path that avoids needing to go further up the tree
1647 // if the parent isn't fragmented (worst case we would have to
1648 // go all the way to the root)
1649 r
= read_dentry(parent_ino
, frag_t(), parent_dname
, &existing_dentry
);
1651 // Great, fast path: return the fragtree from here
1652 if (existing_dentry
.inode
.ino
!= dirino
) {
1653 dout(4) << "Unexpected inode in dentry! 0x" << std::hex
1654 << existing_dentry
.inode
.ino
1655 << " vs expected 0x" << dirino
<< std::dec
<< dendl
;
1658 dout(20) << "fast path, fragtree is "
1659 << existing_dentry
.dirfragtree
<< dendl
;
1660 *result_ft
= existing_dentry
.pick_dirfrag(target_dname
);
1661 dout(20) << "frag is " << *result_ft
<< dendl
;
1663 } else if (r
!= -ENOENT
) {
1664 // Dentry not present in 0th frag, must read parent's fragtree
1666 r
= get_frag_of(parent_ino
, parent_dname
, &parent_frag
);
1668 // We have the parent fragtree, so try again to load our dentry
1669 r
= read_dentry(parent_ino
, parent_frag
, parent_dname
, &existing_dentry
);
1672 *result_ft
= existing_dentry
.pick_dirfrag(target_dname
);
1673 dout(20) << "resolved via parent, frag is " << *result_ft
<< dendl
;
1676 if (r
== -EINVAL
|| r
== -ENOENT
) {
1677 return -ENOENT
; // dentry missing or corrupt, so frag is missing
1683 // Couldn't resolve parent fragtree, so can't find ours.
1686 } else if (r
== -EINVAL
) {
1687 // Unreadable dentry, can't know the fragtree.
1690 // Unexpected error, raise it
1696 int MetadataDriver::inject_with_backtrace(
1697 const inode_backtrace_t
&backtrace
, const InodeStore
&dentry
)
1703 // In order to insert something into a directory, we first (ideally)
1704 // need to know the fragtree for the directory. Sometimes we can't
1705 // get that, in which case we just go ahead and insert it into
1706 // fragment zero for a good chance of that being the right thing
1707 // anyway (most moderate-sized dirs aren't fragmented!)
1711 // My immediate ancestry should be correct, so if we can find that
1712 // directory's dirfrag then go inject it there. This works well
1713 // in the case that this inode's dentry was somehow lost and we
1714 // are recreating it, because the rest of the hierarchy
1715 // will probably still exist.
1717 // It's more of a "better than nothing" approach when rebuilding
1718 // a whole tree, as backtraces will in general not be up to date
1719 // beyond the first parent, if anything in the trace was ever
1720 // moved after the file was created.
1724 // The backtrace tells us inodes for each of the parents. If we are
1725 // creating those parent dirfrags, then there is a risk that somehow
1726 // the inode indicated here was also used for data (not a dirfrag) at
1727 // some stage. That would be a zany situation, and we don't check
1728 // for it here, because to do so would require extra IOs for everything
1729 // we inject, and anyway wouldn't guarantee that the inode number
1730 // wasn't in use in some dentry elsewhere in the metadata tree that
1731 // just happened not to have any data objects.
1733 // On multiple workers touching the same traces
1734 // ============================================
1735 // When creating linkage for a directory, *only* create it if we are
1736 // also creating the object. That way, we might not manage to get the
1737 // *right* linkage for a directory, but at least we won't multiply link
1738 // it. We assume that if a root dirfrag exists for a directory, then
1739 // it is linked somewhere (i.e. that the metadata pool is not already
1742 // Making sure *that* is true is someone else's job! Probably someone
1743 // who is not going to run in parallel, so that they can self-consistently
1744 // look at versions and move things around as they go.
1745 // Note this isn't 100% safe: if we die immediately after creating dirfrag
1746 // object, next run will fail to create linkage for the dirfrag object
1747 // and leave it orphaned.
1749 inodeno_t ino
= backtrace
.ino
;
1750 dout(10) << " inode: 0x" << std::hex
<< ino
<< std::dec
<< dendl
;
1751 for (std::vector
<inode_backpointer_t
>::const_iterator i
= backtrace
.ancestors
.begin();
1752 i
!= backtrace
.ancestors
.end(); ++i
) {
1753 const inode_backpointer_t
&backptr
= *i
;
1754 dout(10) << " backptr: 0x" << std::hex
<< backptr
.dirino
<< std::dec
1755 << "/" << backptr
.dname
<< dendl
;
1757 // Examine root dirfrag for parent
1758 const inodeno_t parent_ino
= backptr
.dirino
;
1759 const std::string dname
= backptr
.dname
;
1762 int r
= get_frag_of(parent_ino
, dname
, &fragment
);
1764 // Don't know fragment, fall back to assuming root
1765 dout(20) << "don't know fragment for 0x" << std::hex
<<
1766 parent_ino
<< std::dec
<< "/" << dname
<< ", will insert to root"
1770 // Find or create dirfrag
1771 // ======================
1772 bool created_dirfrag
;
1773 r
= find_or_create_dirfrag(parent_ino
, fragment
, &created_dirfrag
);
1778 // Check if dentry already exists
1779 // ==============================
1780 InodeStore existing_dentry
;
1781 r
= read_dentry(parent_ino
, fragment
, dname
, &existing_dentry
);
1782 bool write_dentry
= false;
1783 if (r
== -ENOENT
|| r
== -EINVAL
) {
1784 if (r
== -EINVAL
&& !force_corrupt
) {
1787 // Missing or corrupt dentry
1788 write_dentry
= true;
1790 derr
<< "Unexpected error reading dentry 0x" << std::hex
1791 << parent_ino
<< std::dec
<< "/"
1792 << dname
<< ": " << cpp_strerror(r
) << dendl
;
1795 // Dentry already present, does it link to me?
1796 if (existing_dentry
.inode
.ino
== ino
) {
1797 dout(20) << "Dentry 0x" << std::hex
1798 << parent_ino
<< std::dec
<< "/"
1799 << dname
<< " already exists and points to me" << dendl
;
1801 derr
<< "Dentry 0x" << std::hex
1802 << parent_ino
<< std::dec
<< "/"
1803 << dname
<< " already exists but points to 0x"
1804 << std::hex
<< existing_dentry
.inode
.ino
<< std::dec
<< dendl
;
1805 // Fall back to lost+found!
1806 return inject_lost_and_found(backtrace
.ino
, dentry
);
1814 if (i
== backtrace
.ancestors
.begin()) {
1815 // This is the linkage for the file of interest
1816 dout(10) << "Linking inode 0x" << std::hex
<< ino
1817 << " at 0x" << parent_ino
<< "/" << dname
<< std::dec
1818 << " with size=" << dentry
.inode
.size
<< " bytes" << dendl
;
1820 r
= inject_linkage(parent_ino
, dname
, fragment
, dentry
);
1822 // This is the linkage for an ancestor directory
1823 InodeStore ancestor_dentry
;
1824 ancestor_dentry
.inode
.mode
= 0755 | S_IFDIR
;
1826 // Set nfiles to something non-zero, to fool any other code
1827 // that tries to ignore 'empty' directories. This won't be
1828 // accurate, but it should avoid functional issues.
1830 ancestor_dentry
.inode
.dirstat
.nfiles
= 1;
1831 ancestor_dentry
.inode
.dir_layout
.dl_dir_hash
=
1832 g_conf()->mds_default_dir_hash
;
1834 ancestor_dentry
.inode
.nlink
= 1;
1835 ancestor_dentry
.inode
.ino
= ino
;
1836 ancestor_dentry
.inode
.uid
= g_conf()->mds_root_ino_uid
;
1837 ancestor_dentry
.inode
.gid
= g_conf()->mds_root_ino_gid
;
1838 ancestor_dentry
.inode
.version
= 1;
1839 ancestor_dentry
.inode
.backtrace_version
= 1;
1840 r
= inject_linkage(parent_ino
, dname
, fragment
, ancestor_dentry
);
1848 if (!created_dirfrag
) {
1849 // If the parent dirfrag already existed, then stop traversing the
1850 // backtrace: assume that the other ancestors already exist too. This
1851 // is an assumption rather than a truth, but it's a convenient way
1852 // to avoid the risk of creating multiply-linked directories while
1853 // injecting data. If there are in fact missing ancestors, this
1854 // should be fixed up using a separate tool scanning the metadata
1858 // Proceed up the backtrace, creating parents
1866 int MetadataDriver::find_or_create_dirfrag(
1871 ceph_assert(created
!= NULL
);
1873 fnode_t existing_fnode
;
1876 uint64_t read_version
= 0;
1877 int r
= read_fnode(ino
, fragment
, &existing_fnode
, &read_version
);
1878 dout(10) << "read_version = " << read_version
<< dendl
;
1880 if (r
== -ENOENT
|| r
== -EINVAL
) {
1881 if (r
== -EINVAL
&& !force_corrupt
) {
1885 // Missing or corrupt fnode, create afresh
1886 bufferlist fnode_bl
;
1887 fnode_t blank_fnode
;
1888 blank_fnode
.version
= 1;
1889 // mark it as non-empty
1890 blank_fnode
.fragstat
.nfiles
= 1;
1891 blank_fnode
.accounted_fragstat
= blank_fnode
.fragstat
;
1892 blank_fnode
.damage_flags
|= (DAMAGE_STATS
| DAMAGE_RSTATS
);
1893 blank_fnode
.encode(fnode_bl
);
1896 librados::ObjectWriteOperation op
;
1899 ceph_assert(r
== -EINVAL
);
1900 // Case A: We must assert that the version isn't changed since we saw the object
1901 // was unreadable, to avoid the possibility of two data-scan processes
1902 // both creating the frag.
1903 op
.assert_version(read_version
);
1905 ceph_assert(r
== -ENOENT
);
1906 // Case B: The object didn't exist in read_fnode, so while creating it we must
1907 // use an exclusive create to correctly populate *creating with
1908 // whether we created it ourselves or someone beat us to it.
1912 object_t frag_oid
= InodeStore::get_object_name(ino
, fragment
, "");
1913 op
.omap_set_header(fnode_bl
);
1914 r
= metadata_io
.operate(frag_oid
.name
, &op
);
1915 if (r
== -EOVERFLOW
|| r
== -EEXIST
) {
1916 // Someone else wrote it (see case A above)
1917 dout(10) << "Dirfrag creation race: 0x" << std::hex
1918 << ino
<< " " << fragment
<< std::dec
<< dendl
;
1922 // We were unable to create or write it, error out
1923 derr
<< "Failed to create dirfrag 0x" << std::hex
1924 << ino
<< std::dec
<< ": " << cpp_strerror(r
) << dendl
;
1927 // Success: the dirfrag object now exists with a value header
1928 dout(10) << "Created dirfrag: 0x" << std::hex
1929 << ino
<< std::dec
<< dendl
;
1933 derr
<< "Unexpected error reading dirfrag 0x" << std::hex
1934 << ino
<< std::dec
<< " : " << cpp_strerror(r
) << dendl
;
1937 dout(20) << "Dirfrag already exists: 0x" << std::hex
1938 << ino
<< " " << fragment
<< std::dec
<< dendl
;
1944 int MetadataDriver::inject_linkage(
1945 inodeno_t dir_ino
, const std::string
&dname
,
1946 const frag_t fragment
, const InodeStore
&inode
, const snapid_t dnfirst
)
1948 object_t frag_oid
= InodeStore::get_object_name(dir_ino
, fragment
, "");
1951 dentry_key_t
dn_key(CEPH_NOSNAP
, dname
.c_str());
1954 bufferlist dentry_bl
;
1955 encode(dnfirst
, dentry_bl
);
1956 encode('I', dentry_bl
);
1957 inode
.encode_bare(dentry_bl
, CEPH_FEATURES_SUPPORTED_DEFAULT
);
1960 std::map
<std::string
, bufferlist
> vals
;
1961 vals
[key
] = dentry_bl
;
1962 int r
= metadata_io
.omap_set(frag_oid
.name
, vals
);
1964 derr
<< "Error writing dentry 0x" << std::hex
1965 << dir_ino
<< std::dec
<< "/"
1966 << dname
<< ": " << cpp_strerror(r
) << dendl
;
1969 dout(20) << "Injected dentry 0x" << std::hex
1970 << dir_ino
<< "/" << dname
<< " pointing to 0x"
1971 << inode
.inode
.ino
<< std::dec
<< dendl
;
1977 int MetadataDriver::init(
1978 librados::Rados
&rados
, std::string
&metadata_pool_name
, const FSMap
*fsmap
,
1979 fs_cluster_id_t fscid
)
1981 if (metadata_pool_name
.empty()) {
1982 auto fs
= fsmap
->get_filesystem(fscid
);
1983 ceph_assert(fs
!= nullptr);
1984 int64_t const metadata_pool_id
= fs
->mds_map
.get_metadata_pool();
1986 dout(4) << "resolving metadata pool " << metadata_pool_id
<< dendl
;
1987 int r
= rados
.pool_reverse_lookup(metadata_pool_id
, &metadata_pool_name
);
1989 derr
<< "Pool " << metadata_pool_id
1990 << " identified in MDS map not found in RADOS!" << dendl
;
1993 dout(4) << "found metadata pool '" << metadata_pool_name
<< "'" << dendl
;
1995 dout(4) << "forcing metadata pool '" << metadata_pool_name
<< "'" << dendl
;
1997 return rados
.ioctx_create(metadata_pool_name
.c_str(), metadata_io
);
2000 int LocalFileDriver::init(
2001 librados::Rados
&rados
, std::string
&metadata_pool_name
, const FSMap
*fsmap
,
2002 fs_cluster_id_t fscid
)
2007 int LocalFileDriver::inject_data(
2008 const std::string
&file_path
,
2010 uint32_t chunk_size
,
2013 // Scrape the file contents out of the data pool and into the
2016 f
.open(file_path
.c_str(), std::fstream::out
| std::fstream::binary
);
2018 for (uint64_t offset
= 0; offset
< size
; offset
+= chunk_size
) {
2022 snprintf(buf
, sizeof(buf
),
2024 (unsigned long long)ino
,
2025 (unsigned long long)(offset
/ chunk_size
));
2026 std::string
oid(buf
);
2028 int r
= data_io
.read(oid
, bl
, chunk_size
, 0);
2030 if (r
<= 0 && r
!= -ENOENT
) {
2031 derr
<< "error reading data object '" << oid
<< "': "
2032 << cpp_strerror(r
) << dendl
;
2047 int LocalFileDriver::inject_with_backtrace(
2048 const inode_backtrace_t
&bt
,
2049 const InodeStore
&dentry
)
2051 std::string path_builder
= path
;
2053 // Iterate through backtrace creating directory parents
2054 std::vector
<inode_backpointer_t
>::const_reverse_iterator i
;
2055 for (i
= bt
.ancestors
.rbegin();
2056 i
!= bt
.ancestors
.rend(); ++i
) {
2058 const inode_backpointer_t
&backptr
= *i
;
2059 path_builder
+= "/";
2060 path_builder
+= backptr
.dname
;
2062 // Last entry is the filename itself
2063 bool is_file
= (i
+ 1 == bt
.ancestors
.rend());
2065 // FIXME: inject_data won't cope with interesting (i.e. striped)
2066 // layouts (need a librados-compatible Filer to read these)
2067 inject_data(path_builder
, dentry
.inode
.size
,
2068 dentry
.inode
.layout
.object_size
, bt
.ino
);
2070 int r
= mkdir(path_builder
.c_str(), 0755);
2071 if (r
!= 0 && r
!= -EPERM
) {
2072 derr
<< "error creating directory: '" << path_builder
<< "': "
2073 << cpp_strerror(r
) << dendl
;
2082 int LocalFileDriver::inject_lost_and_found(
2084 const InodeStore
&dentry
)
2086 std::string lf_path
= path
+ "/lost+found";
2087 int r
= mkdir(lf_path
.c_str(), 0755);
2088 if (r
!= 0 && r
!= -EPERM
) {
2089 derr
<< "error creating directory: '" << lf_path
<< "': "
2090 << cpp_strerror(r
) << dendl
;
2094 std::string file_path
= lf_path
+ "/" + lost_found_dname(ino
);
2095 return inject_data(file_path
, dentry
.inode
.size
,
2096 dentry
.inode
.layout
.object_size
, ino
);
2099 int LocalFileDriver::init_roots(int64_t data_pool_id
)
2101 // Ensure that the path exists and is a directory
2103 int r
= check_roots(&exists
);
2111 return ::mkdir(path
.c_str(), 0755);
2115 int LocalFileDriver::check_roots(bool *result
)
2117 // Check if the path exists and is a directory
2118 DIR *d
= ::opendir(path
.c_str());
2122 int r
= closedir(d
);
2124 // Weird, but maybe possible with e.g. stale FD on NFS mount?
2134 void MetadataTool::build_file_dentry(
2135 inodeno_t ino
, uint64_t file_size
, time_t file_mtime
,
2136 const file_layout_t
&layout
, InodeStore
*out
)
2138 ceph_assert(out
!= NULL
);
2140 out
->inode
.mode
= 0500 | S_IFREG
;
2141 out
->inode
.size
= file_size
;
2142 out
->inode
.max_size_ever
= file_size
;
2143 out
->inode
.mtime
.tv
.tv_sec
= file_mtime
;
2144 out
->inode
.atime
.tv
.tv_sec
= file_mtime
;
2145 out
->inode
.ctime
.tv
.tv_sec
= file_mtime
;
2147 out
->inode
.layout
= layout
;
2149 out
->inode
.truncate_seq
= 1;
2150 out
->inode
.truncate_size
= -1ull;
2152 out
->inode
.inline_data
.version
= CEPH_INLINE_NONE
;
2154 out
->inode
.nlink
= 1;
2155 out
->inode
.ino
= ino
;
2156 out
->inode
.version
= 1;
2157 out
->inode
.backtrace_version
= 1;
2158 out
->inode
.uid
= g_conf()->mds_root_ino_uid
;
2159 out
->inode
.gid
= g_conf()->mds_root_ino_gid
;
2162 void MetadataTool::build_dir_dentry(
2163 inodeno_t ino
, const frag_info_t
&fragstat
,
2164 const file_layout_t
&layout
, InodeStore
*out
)
2166 ceph_assert(out
!= NULL
);
2168 out
->inode
.mode
= 0755 | S_IFDIR
;
2169 out
->inode
.dirstat
= fragstat
;
2170 out
->inode
.mtime
.tv
.tv_sec
= fragstat
.mtime
;
2171 out
->inode
.atime
.tv
.tv_sec
= fragstat
.mtime
;
2172 out
->inode
.ctime
.tv
.tv_sec
= fragstat
.mtime
;
2174 out
->inode
.layout
= layout
;
2175 out
->inode
.dir_layout
.dl_dir_hash
= g_conf()->mds_default_dir_hash
;
2177 out
->inode
.truncate_seq
= 1;
2178 out
->inode
.truncate_size
= -1ull;
2180 out
->inode
.inline_data
.version
= CEPH_INLINE_NONE
;
2182 out
->inode
.nlink
= 1;
2183 out
->inode
.ino
= ino
;
2184 out
->inode
.version
= 1;
2185 out
->inode
.backtrace_version
= 1;
2186 out
->inode
.uid
= g_conf()->mds_root_ino_uid
;
2187 out
->inode
.gid
= g_conf()->mds_root_ino_gid
;