4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License version 2 for more details. A copy is
14 * included in the COPYING file that accompanied this code.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 * Copyright (c) 2014, 2017, Intel Corporation.
26 * lustre/lfsck/lfsck_striped_dir.c
28 * Author: Fan, Yong <fan.yong@intel.com>
32 * About the verification for striped directory. Some rules and assumptions:
34 * 1) lmv_magic: The magic may be wrong. But it is almost impossible (1/2^32
35 * probability) that a master LMV EA claims as a slave LMV EA by wrong,
36 * so we can ignore such race case and the reverse case.
38 * 2) lmv_master_mdt_index: The master index can be self-verified by compared
39 * with the MDT index directly. The slave stripe index can be verified by
40 * compared with the file name. Although both the name entry and the LMV EA
41 * can be wrong, it is almost impossible that they hit the same bad data
42 * So if they match each other, then trust them. Similarly, for the shard,
43 * it stores index in both slave LMV EA and in linkEA, if the two copies
44 * match, then trust them.
46 * 3) lmv_hash_type: The valid hash type should be LMV_HASH_TYPE_ALL_CHARS or
47 * LMV_HASH_TYPE_FNV_1A_64. If the LFSCK instance on some slave finds that
48 * the name hash against the hash function does not match the MDT, then it
49 * will change the master LMV EA hash type as LMV_HASH_TYPE_UNKNOWN. With
50 * such hash type, the whole striped directory still can be accessed via
51 * lookup/readdir, and also support unlink, but cannot add new name entry.
53 * 3.1) If the master hash type is one of the valid values, then trust the
54 * master LMV EA. Because:
56 * 3.1.1) The master hash type is visible to the client and used by the client.
58 * 3.1.2) For a given name, different hash types may map the name entry to the
59 * same MDT. So simply checking one name entry or some name entries may
60 * cannot verify whether the hash type is correct or not.
62 * 3.1.3) Different shards can claim different hash types, it is not easy to
63 * distinguish which ones are correct. Even though the master is wrong,
64 * as the LFSCK processing, some LFSCK instance on other MDT may finds
65 * unmatched name hash, then it will change the master hash type to
66 * LMV_HASH_TYPE_UNKNOWN as described above. The worst case is euqal
67 * to the case without the LFSCK.
69 * 3.2) If the master hash type is invalid, nor LMV_HASH_TYPE_UNKNOWN, then
70 * trust the first shard with valid hash type (ALL_CHARS or FNV_1A_64).
71 * If the shard is also worng, means there are double failures, then as
72 * the LFSCK processing, other LFSCK instances on the other MDTs may
73 * find unmatched name hash, and then, the master hash type will be
74 * changed to LMV_HASH_TYPE_UNKNOWN as described in the 3).
76 * 3.3) If the master hash type is LMV_HASH_TYPE_UNKNOWN, then it is possible
77 * that some other LFSCK instance on other MDT found bad name hash, then
78 * changed the master hash type to LMV_HASH_TYPE_UNKNOWN as described in
79 * the 3). But it also maybe because of data corruption in master LMV EA.
80 * To make such two cases to be distinguishable, when the LFSCK changes
81 * the master hash type to LMV_HASH_TYPE_UNKNOWN, it will mark in the
82 * master LMV EA (new lmv flags LMV_HASH_FLAG_BAD_TYPE). Then subsequent
83 * LFSCK checking can distinguish them: for former case, turst the master
84 * LMV EA with nothing to be done; otherwise, trust the first shard with
85 * valid hash type (ALL_CHARS or FNV_1A_64) as the 3.2) does.
87 * 4) lmv_stripe_count: For a shard of a striped directory, if its index has
88 * been verified as the 2), then the stripe count must be larger than its
89 * index. For the master object, by scanning each shard's index, the LFSCK
90 * can know the highest index, and the stripe count must be larger than the
91 * known highest index. If the stipe count in the LMV EA matches above two
92 * rules, then it is may be trustable. If both the master claimed stripe
93 * count and the slave claimed stripe count match each own rule, but they
94 * are not the same, then trust the master. Because the stripe count in
95 * the master LMV EA is visible to client and used to distribute the name
96 * entry to some shard, but the slave LMV EA is only used for verification
97 * and invisible to client.
99 * 5) If the master LMV EA is lost, then there are two possible cases:
101 * 5.1) The slave claims slave LMV EA by wrong, means that the parent was not
102 * a striped directory, but its sub-directory has a wrong slave LMV EA.
103 * It is very very race case, similar as the 1), can be ignored.
105 * 5.2) The parent directory is a striped directory, but the master LMV EA
106 * is lost or crashed. Then the LFSCK needs to re-generate the master
107 * LMV EA: the lmv_master_mdt_index is from the MDT device index; the
108 * lmv_hash_type is from the first valid shard; the lmv_stripe_count
109 * will be calculated via scanning all the shards.
111 * 5.2.1) Before re-generating the master LMV EA, the LFSCK needs to check
112 * whether someone has created some file(s) under the master object
113 * after the master LMV EA disappear. If yes, the LFSCK will cannot
114 * re-generate the master LMV EA, otherwise, such new created files
115 * will be invisible to client. Under such case, the LFSCK will mark
116 * the master object as read only (without master LMV EA). Then all
117 * things under the master MDT-object, including those new created
118 * files and the shards themselves, will be visibile to client. And
119 * then the administrator can handle the bad striped directory with
120 * more human knowledge.
122 * 5.2.2) If someone created some special sub-directory under the master
123 * MDT-object with the same naming rule as shard name $FID:$index,
124 * as to the LFSCK cannot detect it before re-generating the master
125 * LMV EA, then such sub-directory itself will be invisible after
126 * the LFSCK re-generating the master LMV EA. The sub-items under
127 * such sub-directory are still visible to client. As the LFSCK
128 * processing, if such sub-directory cause some conflict with other
129 * normal shard, such as the index conflict, then the LFSCK will
130 * remove the master LMV EA and change the master MDT-object to
131 * read-only mode as the 5.2.1). But if there is no conflict, the
132 * LFSCK will regard such sub-directory as a striped shard that
133 * lost its slave LMV EA, and will re-generate slave LMV EA for it.
135 * 5.2.3) Anytime, if the LFSCK found some shards name/index conflict,
136 * and cannot make the distinguish which one is right, then it
137 * will remove the master LMV EA and change the MDT-object to
138 * read-only mode as the 5.2.2).
141 #define DEBUG_SUBSYSTEM S_LFSCK
143 #include <lu_object.h>
144 #include <dt_object.h>
145 #include <md_object.h>
146 #include <lustre_fid.h>
147 #include <lustre_lib.h>
148 #include <lustre_net.h>
149 #include <lustre_lmv.h>
151 #include "lfsck_internal.h"
153 void lfsck_lmv_put(const struct lu_env *env, struct lfsck_lmv *llmv)
155 if (llmv != NULL && atomic_dec_and_test(&llmv->ll_ref)) {
156 if (llmv->ll_inline) {
157 struct lfsck_lmv_unit *llu;
158 struct lfsck_instance *lfsck;
160 llu = list_entry(llmv, struct lfsck_lmv_unit, llu_lmv);
161 lfsck = llu->llu_lfsck;
163 spin_lock(&lfsck->li_lock);
164 list_del(&llu->llu_link);
165 spin_unlock(&lfsck->li_lock);
167 lfsck_object_put(env, llu->llu_obj);
169 LASSERT(llmv->ll_lslr != NULL);
171 OBD_FREE_LARGE(llmv->ll_lslr,
172 sizeof(*llmv->ll_lslr) *
173 llmv->ll_stripes_allocated);
176 if (llmv->ll_lslr != NULL)
177 OBD_FREE_LARGE(llmv->ll_lslr,
178 sizeof(*llmv->ll_lslr) *
179 llmv->ll_stripes_allocated);
187 * Mark the specified directory as read-only by set LUSTRE_IMMUTABLE_FL.
189 * The caller has taken the ldlm lock on the @obj already.
191 * \param[in] env pointer to the thread context
192 * \param[in] com pointer to the lfsck component
193 * \param[in] obj pointer to the object to be handled
194 * \param[in] del_lmv true if need to drop the LMV EA
196 * \retval positive number if nothing to be done
197 * \retval zero for success
198 * \retval negative error number on failure
200 static int lfsck_disable_master_lmv(const struct lu_env *env,
201 struct lfsck_component *com,
202 struct dt_object *obj, bool del_lmv)
204 struct lfsck_thread_info *info = lfsck_env_info(env);
205 struct lu_attr *la = &info->lti_la;
206 struct lfsck_instance *lfsck = com->lc_lfsck;
207 struct dt_device *dev = lfsck_obj2dev(obj);
208 struct thandle *th = NULL;
212 th = dt_trans_create(env, dev);
214 GOTO(log, rc = PTR_ERR(th));
217 rc = dt_declare_xattr_del(env, obj, XATTR_NAME_LMV, th);
222 la->la_valid = LA_FLAGS;
223 rc = dt_declare_attr_set(env, obj, la, th);
227 rc = dt_trans_start_local(env, dev, th);
231 dt_write_lock(env, obj, 0);
232 if (unlikely(lfsck_is_dead_obj(obj)))
233 GOTO(unlock, rc = 1);
235 if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
236 GOTO(unlock, rc = 0);
239 rc = dt_xattr_del(env, obj, XATTR_NAME_LMV, th);
244 rc = dt_attr_get(env, obj, la);
245 if (rc == 0 && !(la->la_flags & LUSTRE_IMMUTABLE_FL)) {
246 la->la_valid = LA_FLAGS;
247 la->la_flags |= LUSTRE_IMMUTABLE_FL;
248 rc = dt_attr_set(env, obj, la, th);
254 dt_write_unlock(env, obj);
257 dt_trans_stop(env, dev, th);
260 CDEBUG(D_LFSCK, "%s: namespace LFSCK set the master MDT-object of "
261 "the striped directory "DFID" as read-only: rc = %d\n",
262 lfsck_lfsck2name(lfsck), PFID(lfsck_dto2fid(obj)), rc);
265 struct lfsck_namespace *ns = com->lc_file_ram;
267 ns->ln_flags |= LF_INCONSISTENT;
269 ns->ln_striped_dirs_disabled++;
275 static inline bool lfsck_is_valid_slave_lmv(struct lmv_mds_md_v1 *lmv)
277 return lmv->lmv_stripe_count >= 1 &&
278 lmv->lmv_stripe_count <= LFSCK_LMV_MAX_STRIPES &&
279 lmv->lmv_stripe_count > lmv->lmv_master_mdt_index &&
280 lmv_is_known_hash_type(lmv->lmv_hash_type);
284 * Remove the striped directory's master LMV EA and mark it as read-only.
286 * Take ldlm lock on the striped directory before calling the
287 * lfsck_disable_master_lmv().
289 * \param[in] env pointer to the thread context
290 * \param[in] com pointer to the lfsck component
291 * \param[in] obj pointer to the striped directory to be handled
292 * \param[in] lnr pointer to the namespace request that contains the
293 * striped directory to be handled and other information
295 * \retval positive number if nothing to be done
296 * \retval zero for success
297 * \retval negative error number on failure
299 static int lfsck_remove_lmv(const struct lu_env *env,
300 struct lfsck_component *com,
301 struct dt_object *obj,
302 struct lfsck_namespace_req *lnr)
304 struct lustre_handle lh = { 0 };
307 lnr->lnr_lmv->ll_ignore = 1;
308 rc = lfsck_ibits_lock(env, com->lc_lfsck, obj, &lh,
309 MDS_INODELOCK_UPDATE | MDS_INODELOCK_XATTR,
312 rc = lfsck_disable_master_lmv(env, com, obj, true);
313 lfsck_ibits_unlock(&lh, LCK_EX);
320 * Remove the name entry from the striped directory's master MDT-object.
322 * \param[in] env pointer to the thread context
323 * \param[in] com pointer to the lfsck component
324 * \param[in] dir pointer to the striped directory
325 * \param[in] fid the shard's FID which name entry will be removed
326 * \param[in] index the shard's index which name entry will be removed
328 * \retval positive number for repaired successfully
329 * \retval 0 if nothing to be repaired
330 * \retval negative error number on failure
332 static int lfsck_remove_dirent(const struct lu_env *env,
333 struct lfsck_component *com,
334 struct dt_object *dir,
335 const struct lu_fid *fid, __u32 index)
337 struct lfsck_thread_info *info = lfsck_env_info(env);
338 struct dt_object *obj;
341 snprintf(info->lti_tmpbuf2, sizeof(info->lti_tmpbuf2), DFID":%u",
343 obj = lfsck_object_find_bottom(env, com->lc_lfsck, fid);
347 rc = lfsck_namespace_repair_dirent(env, com, dir, obj,
348 info->lti_tmpbuf2, info->lti_tmpbuf2,
349 S_IFDIR, false, false);
350 lfsck_object_put(env, obj);
352 struct lfsck_namespace *ns = com->lc_file_ram;
354 ns->ln_dirent_repaired++;
361 * Remove old shard's name entry and refill the @lslr slot with new shard.
363 * Some old shard held the specified @lslr slot, but it is an invalid shard.
364 * This function will remove the bad shard's name entry, and refill the @lslr
365 * slot with the new shard.
367 * \param[in] env pointer to the thread context
368 * \param[in] com pointer to the lfsck component
369 * \param[in] dir pointer to the striped directory to be handled
370 * \param[in] lslr pointer to lfsck_disable_master_lmv slot which content
371 * will be replaced by the given information
372 * \param[in] lnr contain the shard's FID to be used to fill the
373 * @lslr slot, it also records the known max filled index
374 * and the known max stripe count
375 * \param[in] lmv contain the slave LMV EA to be used to fill the
377 * \param[in] index the old shard's index in the striped directory
378 * \param[in] flags the new shard's flags in the @lslr slot
380 * \retval zero for success
381 * \retval negative error number on failure
383 static int lfsck_replace_lmv(const struct lu_env *env,
384 struct lfsck_component *com,
385 struct dt_object *dir,
386 struct lfsck_slave_lmv_rec *lslr,
387 struct lfsck_namespace_req *lnr,
388 struct lmv_mds_md_v1 *lmv,
389 __u32 index, __u32 flags)
391 struct lfsck_lmv *llmv = lnr->lnr_lmv;
394 rc = lfsck_remove_dirent(env, com, dir,
395 &lslr->lslr_fid, index);
399 lslr->lslr_fid = lnr->lnr_fid;
400 lslr->lslr_flags = flags;
401 lslr->lslr_stripe_count = lmv->lmv_stripe_count;
402 lslr->lslr_index = lmv->lmv_master_mdt_index;
403 lslr->lslr_hash_type = lmv->lmv_hash_type;
404 if (flags == LSLF_NONE) {
405 if (llmv->ll_hash_type == LMV_HASH_TYPE_UNKNOWN &&
406 lmv_is_known_hash_type(lmv->lmv_hash_type))
407 llmv->ll_hash_type = lmv->lmv_hash_type;
409 if (lslr->lslr_stripe_count <= LFSCK_LMV_MAX_STRIPES &&
410 llmv->ll_max_stripe_count < lslr->lslr_stripe_count)
411 llmv->ll_max_stripe_count = lslr->lslr_stripe_count;
418 * Record the slave LMV EA in the lfsck_lmv::ll_lslr.
420 * If the lfsck_lmv::ll_lslr slot corresponding to the given @shard_idx is free,
421 * then fill the slot with the given @lnr/@lmv/@flags directly (maybe need to
422 * extend the lfsck_lmv::ll_lslr buffer).
424 * If the lfsck_lmv::ll_lslr slot corresponding to the given @shard_idx is taken
425 * by other shard, then the LFSCK will try to resolve the conflict by checking
426 * the two conflict shards' flags, and try other possible slot (if one of them
427 * claims another possible @shard_idx).
429 * 1) If one of the two conflict shards can be recorded in another slot, then
430 * it is OK, go ahead. Otherwise,
432 * 2) If one of them is dangling name entry, then remove (one of) the dangling
433 * name entry (and replace related @lslr slot if needed). Otherwise,
435 * 3) If one of them has no slave LMV EA, then check whether the master LMV
436 * EA has ever been lost and re-generated (LMV_HASH_FLAG_LOST_LMV in the
439 * 3.1) If yes, then it is possible that such object is not a real shard of
440 * the striped directory, instead, it was created by someone after the
441 * master LMV EA lost with the name that matches the shard naming rule.
442 * Then the LFSCK will remove the master LMV EA and mark the striped
443 * directory as read-only to allow those non-shard files to be visible
446 * 3.2) If no, then remove (one of) the object what has no slave LMV EA.
448 * 4) If all above efforts cannot work, then the LFSCK cannot know how to
449 * recover the striped directory. To make the administrator can see the
450 * conflicts, the LFSCK will remove the master LMV EA and mark the striped
451 * directory as read-only.
453 * This function may be called recursively, to prevent overflow, we define
454 * LFSCK_REC_LMV_MAX_DEPTH to restrict the recursive call depth.
456 * \param[in] env pointer to the thread context
457 * \param[in] com pointer to the lfsck component
458 * \param[in] dir pointer to the striped directory to be handled
459 * \param[in] lnr contain the shard's FID to fill the @lslr slot,
460 * it also records the known max filled index and
461 * the known max stripe count
462 * \param[in] lmv pointer to the slave LMV EA to be recorded
463 * \param[in] shard_idx the shard's index used for locating the @lslr slot,
464 * it can be the index stored in the shard's name,
465 * it also can be the index stored in the slave LMV EA
466 * (for recursive case)
467 * \param[in] flags the shard's flags to be recorded in the @lslr slot
468 * to indicate the shard status, such as whether has
469 * slave LMV EA, whether dangling name entry, whether
470 * the name entry and slave LMV EA unmatched, and ect
471 * \param[in] flags2 when be called recursively, the @flags2 tells the
472 * former conflict shard's flags in the @lslr slot.
473 * \param[in,out] depth To prevent to be called recurisively too deep,
474 * we define the max depth can be called recursively
475 * (LFSCK_REC_LMV_MAX_DEPTH)
477 * \retval zero for success
478 * \retval "-ERANGE" for invalid @shard_idx
479 * \retval "-EEXIST" for the required lslr slot has been
480 * occupied by other shard
481 * \retval other negative error number on failure
483 static int lfsck_record_lmv(const struct lu_env *env,
484 struct lfsck_component *com,
485 struct dt_object *dir,
486 struct lfsck_namespace_req *lnr,
487 struct lmv_mds_md_v1 *lmv, __u32 shard_idx,
488 __u32 flags, __u32 flags2, __u32 *depth)
490 struct lfsck_instance *lfsck = com->lc_lfsck;
491 struct lfsck_lmv *llmv = lnr->lnr_lmv;
492 const struct lu_fid *fid = &lnr->lnr_fid;
493 struct lfsck_slave_lmv_rec *lslr;
494 struct lfsck_rec_lmv_save *lrls;
495 int index = shard_idx;
499 CDEBUG(D_LFSCK, "%s: record slave LMV EA for the striped directory "
500 DFID": shard = "DFID", index = %u, flags = %u, flags2 = %u, "
501 "depth = %d\n", lfsck_lfsck2name(lfsck),
502 PFID(lfsck_dto2fid(dir)), PFID(fid),
503 index, flags, flags2, *depth);
505 if (index < 0 || index >= LFSCK_LMV_MAX_STRIPES)
508 if (index >= llmv->ll_stripes_allocated) {
509 struct lfsck_slave_lmv_rec *new_lslr;
510 int new_stripes = index + 1;
511 size_t old_size = sizeof(*lslr) * llmv->ll_stripes_allocated;
513 OBD_ALLOC_LARGE(new_lslr, sizeof(*new_lslr) * new_stripes);
514 if (new_lslr == NULL) {
520 memcpy(new_lslr, llmv->ll_lslr, old_size);
521 OBD_FREE_LARGE(llmv->ll_lslr, old_size);
522 llmv->ll_stripes_allocated = new_stripes;
523 llmv->ll_lslr = new_lslr;
526 lslr = llmv->ll_lslr + index;
527 if (unlikely(lu_fid_eq(&lslr->lslr_fid, fid)))
530 if (fid_is_zero(&lslr->lslr_fid)) {
531 lslr->lslr_fid = *fid;
532 lslr->lslr_stripe_count = lmv->lmv_stripe_count;
533 lslr->lslr_index = lmv->lmv_master_mdt_index;
534 lslr->lslr_hash_type = lmv->lmv_hash_type;
535 lslr->lslr_flags = flags;
536 llmv->ll_stripes_filled++;
537 if (flags == LSLF_NONE) {
538 if (llmv->ll_hash_type == LMV_HASH_TYPE_UNKNOWN &&
539 lmv_is_known_hash_type(lmv->lmv_hash_type))
540 llmv->ll_hash_type = lmv->lmv_hash_type;
542 if (lslr->lslr_stripe_count <= LFSCK_LMV_MAX_STRIPES &&
543 llmv->ll_max_stripe_count < lslr->lslr_stripe_count)
544 llmv->ll_max_stripe_count =
545 lslr->lslr_stripe_count;
548 if (llmv->ll_max_filled_off < index)
549 llmv->ll_max_filled_off = index;
555 if (flags != LSLF_BAD_INDEX2)
556 LASSERTF(*depth == 1, "depth = %d\n", *depth);
558 /* Handle conflict cases. */
559 switch (lslr->lslr_flags) {
561 case LSLF_BAD_INDEX2:
562 /* The existing one is a normal valid object. */
565 /* The two 'valid' name entries claims the same
566 * index, the LFSCK cannot distinguish which one
567 * is correct. Then remove the master LMV EA to
568 * make all shards to be visible to client, and
569 * mark the master MDT-object as read-only. The
570 * administrator can handle the conflict with
571 * more human knowledge. */
572 rc = lfsck_remove_lmv(env, com, dir, lnr);
574 case LSLF_BAD_INDEX2:
575 GOTO(out, rc = -EEXIST);
579 if (llmv->ll_lmv.lmv_hash_type &
580 LMV_HASH_FLAG_LOST_LMV) {
581 /* If the master LMV EA was re-generated
582 * by the former LFSCK reparation, and
583 * before such reparation, someone has
584 * created the conflict object, but the
585 * LFSCK did not detect such conflict,
586 * then we have to remove the master
587 * LMV EA and mark the master MDT-object
588 * as read-only. The administrator can
589 * handle the conflict with more human
591 rc = lfsck_remove_lmv(env, com, dir, lnr);
593 /* Otherwise, remove the current name entry,
594 * and add its FID in the LFSCK tracing file
595 * for further processing. */
596 rc = lfsck_namespace_trace_update(env, com, fid,
597 LNTF_CHECK_PARENT, true);
599 rc = lfsck_remove_dirent(env, com, dir,
605 /* Remove the current dangling name entry. */
606 rc = lfsck_remove_dirent(env, com, dir, fid, index);
608 case LSLF_BAD_INDEX1:
609 index = lmv->lmv_master_mdt_index;
610 lmv->lmv_master_mdt_index = shard_idx;
611 /* The name entry claims an index that is conflict
612 * with a valid existing name entry, then try the
613 * index in the lmv recursively. */
614 rc = lfsck_record_lmv(env, com, dir, lnr, lmv, index,
615 LSLF_BAD_INDEX2, lslr->lslr_flags, depth);
616 lmv->lmv_master_mdt_index = index;
617 if (rc == -ERANGE || rc == -EEXIST)
618 /* The index in the lmv is invalid or
619 * also conflict with other. Then we do
620 * not know how to resolve the conflict.
621 * We will handle it as handle the case
622 * of 'LSLF_NONE' vs 'LSLF_NONE'. */
623 rc = lfsck_remove_lmv(env, com, dir, lnr);
632 /* The existing one has no slave LMV EA. */
637 if (llmv->ll_lmv.lmv_hash_type &
638 LMV_HASH_FLAG_LOST_LMV) {
639 /* If the master LMV EA was re-generated
640 * by the former LFSCK reparation, and
641 * before such reparation, someone has
642 * created the conflict object, but the
643 * LFSCK did not detect such conflict,
644 * then we have to remove the master
645 * LMV EA and mark the master MDT-object
646 * as read-only. The administrator can
647 * handle the conflict with more human
649 rc = lfsck_remove_lmv(env, com, dir, lnr);
651 lrls = &lfsck->li_rec_lmv_save[*depth - 1];
652 lrls->lrls_fid = lslr->lslr_fid;
653 /* Otherwise, remove the existing name entry,
654 * and add its FID in the LFSCK tracing file
655 * for further processing. Refill the slot
656 * with current slave LMV EA. */
657 rc = lfsck_namespace_trace_update(env,
658 com, &lrls->lrls_fid,
659 LNTF_CHECK_PARENT, true);
661 rc = lfsck_replace_lmv(env, com, dir,
662 lslr, lnr, lmv, index, flags);
666 case LSLF_BAD_INDEX2:
667 if (flags2 >= lslr->lslr_flags)
668 GOTO(out, rc = -EEXIST);
674 /* Remove the current dangling name entry. */
675 rc = lfsck_remove_dirent(env, com, dir, fid, index);
677 case LSLF_BAD_INDEX1:
678 index = lmv->lmv_master_mdt_index;
679 lmv->lmv_master_mdt_index = shard_idx;
680 /* The name entry claims an index that is conflict
681 * with a valid existing name entry, then try the
682 * index in the lmv recursively. */
683 rc = lfsck_record_lmv(env, com, dir, lnr, lmv, index,
684 LSLF_BAD_INDEX2, lslr->lslr_flags, depth);
685 lmv->lmv_master_mdt_index = index;
686 if (rc == -ERANGE || rc == -EEXIST) {
698 /* The existing one is a dangling name entry. */
701 case LSLF_BAD_INDEX2:
703 /* Remove the existing dangling name entry.
704 * Refill the lslr slot with the given LMV. */
705 rc = lfsck_replace_lmv(env, com, dir, lslr, lnr,
709 /* Two dangling name entries conflict,
710 * remove the current one. */
711 rc = lfsck_remove_dirent(env, com, dir, fid, index);
713 case LSLF_BAD_INDEX1:
714 index = lmv->lmv_master_mdt_index;
715 lmv->lmv_master_mdt_index = shard_idx;
716 /* The name entry claims an index that is conflict
717 * with a valid existing name entry, then try the
718 * index in the lmv recursively. */
719 rc = lfsck_record_lmv(env, com, dir, lnr, lmv, index,
720 LSLF_BAD_INDEX2, lslr->lslr_flags, depth);
721 lmv->lmv_master_mdt_index = index;
722 if (rc == -ERANGE || rc == -EEXIST)
723 /* If the index in the lmv is invalid or
724 * also conflict with other, then remove
725 * the existing dangling name entry.
726 * Refill the lslr slot with the given LMV. */
727 rc = lfsck_replace_lmv(env, com, dir, lslr, lnr,
728 lmv, shard_idx, flags);
736 case LSLF_BAD_INDEX1: {
737 if (*depth >= LFSCK_REC_LMV_MAX_DEPTH)
740 lrls = &lfsck->li_rec_lmv_save[*depth - 1];
741 lrls->lrls_fid = lnr->lnr_fid;
742 lrls->lrls_lmv = *lmv;
744 lnr->lnr_fid = lslr->lslr_fid;
745 lmv->lmv_master_mdt_index = index;
746 lmv->lmv_stripe_count = lslr->lslr_stripe_count;
747 lmv->lmv_hash_type = lslr->lslr_hash_type;
748 index = lslr->lslr_index;
750 /* The existing one has another possible slot,
751 * try it recursively. */
752 rc = lfsck_record_lmv(env, com, dir, lnr, lmv, index,
753 LSLF_BAD_INDEX2, flags, depth);
754 *lmv = lrls->lrls_lmv;
755 lnr->lnr_fid = lrls->lrls_fid;
758 if (rc == -ERANGE || rc == -EEXIST)
764 lslr->lslr_fid = *fid;
765 lslr->lslr_flags = flags;
766 lslr->lslr_stripe_count = lmv->lmv_stripe_count;
767 lslr->lslr_index = lmv->lmv_master_mdt_index;
768 lslr->lslr_hash_type = lmv->lmv_hash_type;
769 if (flags == LSLF_NONE) {
770 if (llmv->ll_hash_type == LMV_HASH_TYPE_UNKNOWN &&
771 lmv_is_known_hash_type(lmv->lmv_hash_type))
772 llmv->ll_hash_type = lmv->lmv_hash_type;
774 if (lslr->lslr_stripe_count <= LFSCK_LMV_MAX_STRIPES &&
775 llmv->ll_max_stripe_count < lslr->lslr_stripe_count)
776 llmv->ll_max_stripe_count =
777 lslr->lslr_stripe_count;
785 /* The two 'valid' name entries claims the same
786 * index, the LFSCK cannot distinguish which one
787 * is correct. Then remove the master LMV EA to
788 * make all shards to be visible to client, and
789 * mark the master MDT-object as read-only. The
790 * administrator can handle the conflict with
791 * more human knowledge. */
792 rc = lfsck_remove_lmv(env, com, dir, lnr);
794 case LSLF_BAD_INDEX2:
795 GOTO(out, rc = -EEXIST);
799 /* Remove the current dangling name entry. */
800 rc = lfsck_remove_dirent(env, com, dir, fid, index);
802 case LSLF_BAD_INDEX1:
803 index = lmv->lmv_master_mdt_index;
804 lmv->lmv_master_mdt_index = shard_idx;
805 /* The name entry claims an index that is conflict
806 * with a valid existing name entry, then try the
807 * index in the lmv recursively. */
808 rc = lfsck_record_lmv(env, com, dir, lnr, lmv, index,
809 LSLF_BAD_INDEX2, lslr->lslr_flags, depth);
810 lmv->lmv_master_mdt_index = index;
811 if (rc == -ERANGE || rc == -EEXIST)
812 /* The index in the lmv is invalid or
813 * also conflict with other. Then we do
814 * not know how to resolve the conflict.
815 * We will handle it as handle the case
816 * of 'LSLF_NONE' vs 'LSLF_NONE'. */
817 rc = lfsck_remove_lmv(env, com, dir, lnr);
836 return rc > 0 ? 0 : rc;
839 int lfsck_read_stripe_lmv(const struct lu_env *env, struct dt_object *obj,
840 struct lmv_mds_md_v1 *lmv)
842 struct lfsck_thread_info *info = lfsck_env_info(env);
843 struct lu_buf *buf = &info->lti_buf;
844 int size = sizeof(*lmv) + sizeof(struct lu_fid) * 2;
847 dt_read_lock(env, obj, 0);
849 buf->lb_len = sizeof(*lmv);
850 rc = dt_xattr_get(env, obj, buf, XATTR_NAME_LMV);
851 if (unlikely(rc == -ERANGE)) {
852 buf = &info->lti_big_buf;
853 lu_buf_check_and_alloc(buf, size);
854 rc = dt_xattr_get(env, obj, buf, XATTR_NAME_LMV);
855 /* For the in-migration directory, its LMV EA contains
856 * not only the LMV header, but also the FIDs for both
857 * source and target. So the LMV EA size is larger. */
860 memcpy(lmv, buf->lb_buf, rc);
863 dt_read_unlock(env, obj);
864 if (rc != sizeof(*lmv))
865 return rc > 0 ? -EINVAL : rc;
867 lfsck_lmv_header_le_to_cpu(lmv, lmv);
868 if ((lmv->lmv_magic == LMV_MAGIC &&
869 !(lmv->lmv_hash_type & LMV_HASH_FLAG_MIGRATION)) ||
870 (lmv->lmv_magic == LMV_MAGIC_STRIPE &&
871 !(lmv->lmv_hash_type & LMV_HASH_FLAG_DEAD)))
878 * Parse the shard's index from the given shard name.
880 * The valid shard name/type should be:
881 * 1) The type must be S_IFDIR
882 * 2) The name should be $FID:$index
883 * 3) the index should within valid range.
885 * \param[in] env pointer to the thread context
886 * \param[in] name the shard name
887 * \param[in] namelen the name length
888 * \param[in] type the entry's type
889 * \param[in] fid the entry's FID
891 * \retval zero or positive number for the index from the name
892 * \retval negative error number on failure
894 int lfsck_shard_name_to_index(const struct lu_env *env, const char *name,
895 int namelen, __u16 type, const struct lu_fid *fid)
897 char *name2 = lfsck_env_info(env)->lti_tmpbuf2;
904 LASSERT(name != name2);
906 len = snprintf(name2, sizeof(lfsck_env_info(env)->lti_tmpbuf2),
908 if (namelen < len + 1 || memcmp(name, name2, len) != 0)
912 if (!isdigit(name[len]))
915 idx = idx * 10 + name[len++] - '0';
916 } while (len < namelen);
918 if (idx >= LFSCK_LMV_MAX_STRIPES)
924 bool lfsck_is_valid_slave_name_entry(const struct lu_env *env,
925 struct lfsck_lmv *llmv,
926 const char *name, int namelen)
928 struct lmv_mds_md_v1 *lmv;
931 if (llmv == NULL || !llmv->ll_lmv_slave || !llmv->ll_lmv_verified)
935 idx = lmv_name_to_stripe_index(lmv->lmv_hash_type,
936 lmv->lmv_stripe_count,
938 if (unlikely(idx != lmv->lmv_master_mdt_index))
945 * Check whether the given name is a valid entry under the @parent.
947 * If the @parent is a striped directory then the @child should one
948 * shard of the striped directory, its name should be $FID:$index.
950 * If the @parent is a shard of a striped directory, then the name hash
951 * should match the MDT, otherwise it is invalid.
953 * \param[in] env pointer to the thread context
954 * \param[in] parent the parent directory
955 * \param[in] child the child object to be checked
956 * \param[in] cname the name for the @child in the parent directory
958 * \retval positive number for invalid name entry
959 * \retval 0 if the name is valid or uncertain
960 * \retval negative error number on failure
962 int lfsck_namespace_check_name(const struct lu_env *env,
963 struct dt_object *parent,
964 struct dt_object *child,
965 const struct lu_name *cname)
967 struct lmv_mds_md_v1 *lmv = &lfsck_env_info(env)->lti_lmv;
971 rc = lfsck_read_stripe_lmv(env, parent, lmv);
973 RETURN(rc == -ENODATA ? 0 : rc);
975 if (lmv->lmv_magic == LMV_MAGIC_STRIPE) {
976 if (!lfsck_is_valid_slave_lmv(lmv))
979 idx = lmv_name_to_stripe_index(lmv->lmv_hash_type,
980 lmv->lmv_stripe_count,
983 if (unlikely(idx != lmv->lmv_master_mdt_index))
985 } else if (lfsck_shard_name_to_index(env, cname->ln_name,
986 cname->ln_namelen, lfsck_object_type(child),
987 lfsck_dto2fid(child)) < 0) {
995 * Update the object's LMV EA with the given @lmv.
997 * \param[in] env pointer to the thread context
998 * \param[in] com pointer to the lfsck component
999 * \param[in] obj pointer to the object which LMV EA will be updated
1000 * \param[in] lmv pointer to buffer holding the new LMV EA
1001 * \param[in] locked whether the caller has held ldlm lock on the @obj or not
1003 * \retval positive number for nothing to be done
1004 * \retval zero if updated successfully
1005 * \retval negative error number on failure
1007 int lfsck_namespace_update_lmv(const struct lu_env *env,
1008 struct lfsck_component *com,
1009 struct dt_object *obj,
1010 struct lmv_mds_md_v1 *lmv, bool locked)
1012 struct lfsck_thread_info *info = lfsck_env_info(env);
1013 struct lmv_mds_md_v1 *lmv4 = &info->lti_lmv4;
1014 struct lu_buf *buf = &info->lti_buf;
1015 struct lfsck_instance *lfsck = com->lc_lfsck;
1016 struct dt_device *dev = lfsck_obj2dev(obj);
1017 struct thandle *th = NULL;
1018 struct lustre_handle lh = { 0 };
1023 LASSERT(lmv4 != lmv);
1025 lfsck_lmv_header_cpu_to_le(lmv4, lmv);
1026 lfsck_buf_init(buf, lmv4, sizeof(*lmv4));
1029 rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
1030 MDS_INODELOCK_UPDATE |
1031 MDS_INODELOCK_XATTR, LCK_EX);
1036 th = dt_trans_create(env, dev);
1038 GOTO(log, rc = PTR_ERR(th));
1040 /* For remote updating LMV EA, there will be further LFSCK action on
1041 * remote MDT after the updating, so update the LMV EA synchronously. */
1042 if (dt_object_remote(obj))
1045 rc = dt_declare_xattr_set(env, obj, buf, XATTR_NAME_LMV, 0, th);
1049 rc = dt_trans_start_local(env, dev, th);
1053 dt_write_lock(env, obj, 0);
1054 if (unlikely(lfsck_is_dead_obj(obj)))
1055 GOTO(unlock, rc = 1);
1057 if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1058 GOTO(unlock, rc = 0);
1060 rc = dt_xattr_set(env, obj, buf, XATTR_NAME_LMV, 0, th);
1065 dt_write_unlock(env, obj);
1068 rc1 = dt_trans_stop(env, dev, th);
1073 lfsck_ibits_unlock(&lh, LCK_EX);
1074 CDEBUG(D_LFSCK, "%s: namespace LFSCK updated the %s LMV EA "
1075 "for the object "DFID": rc = %d\n",
1076 lfsck_lfsck2name(lfsck),
1077 lmv->lmv_magic == LMV_MAGIC ? "master" : "slave",
1078 PFID(lfsck_dto2fid(obj)), rc);
1084 * Check whether allow to re-genereate the lost master LMV EA.
1086 * If the master MDT-object of the striped directory lost its master LMV EA,
1087 * then before the LFSCK repaired the striped directory, some ones may have
1088 * created some objects (that are not normal shards of the striped directory)
1089 * under the master MDT-object. If such case happend, then the LFSCK cannot
1090 * re-generate the lost master LMV EA to keep those objects to be visible to
1093 * \param[in] env pointer to the thread context
1094 * \param[in] com pointer to the lfsck component
1095 * \param[in] obj pointer to the master MDT-object to be checked
1096 * \param[in] cfid the shard's FID used for verification
1097 * \param[in] cidx the shard's index used for verification
1099 * \retval positive number if not allow to re-generate LMV EA
1100 * \retval zero if allow to re-generate LMV EA
1101 * \retval negative error number on failure
1103 static int lfsck_allow_regenerate_master_lmv(const struct lu_env *env,
1104 struct lfsck_component *com,
1105 struct dt_object *obj,
1106 const struct lu_fid *cfid,
1109 struct lfsck_thread_info *info = lfsck_env_info(env);
1110 struct lu_fid *tfid = &info->lti_fid3;
1111 struct lfsck_instance *lfsck = com->lc_lfsck;
1112 struct lu_dirent *ent =
1113 (struct lu_dirent *)info->lti_key;
1114 const struct dt_it_ops *iops;
1122 if (unlikely(!dt_try_as_dir(env, obj)))
1125 /* Check whether the shard and the master MDT-object matches or not. */
1126 snprintf(info->lti_tmpbuf, sizeof(info->lti_tmpbuf), DFID":%u",
1128 rc = dt_lookup(env, obj, (struct dt_rec *)tfid,
1129 (const struct dt_key *)info->lti_tmpbuf);
1133 if (!lu_fid_eq(tfid, cfid))
1136 args = lfsck->li_args_dir & ~(LUDA_VERIFY | LUDA_VERIFY_DRYRUN);
1137 iops = &obj->do_index_ops->dio_it;
1138 di = iops->init(env, obj, args);
1140 RETURN(PTR_ERR(di));
1142 rc = iops->load(env, di, 0);
1144 rc = iops->next(env, di);
1152 rc = iops->rec(env, di, (struct dt_rec *)ent, args);
1154 rc = lfsck_unpack_ent(ent, &cookie, &type);
1159 /* skip dot and dotdot entries */
1160 if (name_is_dot_or_dotdot(ent->lde_name, ent->lde_namelen))
1163 /* If the subdir name does not match the shard name rule, then
1164 * it is quite possible that it is NOT a shard, but created by
1165 * someone after the master MDT-object lost the master LMV EA.
1166 * But it is also possible that the subdir name entry crashed,
1167 * under such double failure cases, the LFSCK cannot know how
1168 * to repair the inconsistency. For data safe, the LFSCK will
1169 * mark the master MDT-object as read-only. The administrator
1170 * can fix the bad shard name manually, then run LFSCK again.
1172 * XXX: If the subdir name matches the shard name rule, but it
1173 * is not a real shard of the striped directory, instead,
1174 * it was created by someone after the master MDT-object
1175 * lost the LMV EA, then re-generating the master LMV EA
1176 * will cause such subdir to be invisible to client, and
1177 * if its index occupies some lost shard index, then the
1178 * LFSCK will use it to replace the bad shard, and cause
1179 * the subdir (itself) to be invisible for ever. */
1180 if (lfsck_shard_name_to_index(env, ent->lde_name,
1181 ent->lde_namelen, type, &ent->lde_fid) < 0)
1185 rc = iops->next(env, di);
1192 iops->fini(env, di);
1198 * Notify remote LFSCK instance that the object's LMV EA has been updated.
1200 * \param[in] env pointer to the thread context
1201 * \param[in] com pointer to the lfsck component
1202 * \param[in] obj pointer to the object on which the LMV EA will be set
1203 * \param[in] event indicate either master or slave LMV EA has been updated
1204 * \param[in] flags indicate which element(s) in the LMV EA has been updated
1205 * \param[in] index the MDT index on which the LFSCK instance to be notified
1207 * \retval positive number if nothing to be done
1208 * \retval zero for success
1209 * \retval negative error number on failure
1211 static int lfsck_namespace_notify_lmv_remote(const struct lu_env *env,
1212 struct lfsck_component *com,
1213 struct dt_object *obj,
1214 __u32 event, __u32 flags,
1217 struct lfsck_request *lr = &lfsck_env_info(env)->lti_lr;
1218 const struct lu_fid *fid = lfsck_dto2fid(obj);
1219 struct lfsck_instance *lfsck = com->lc_lfsck;
1220 struct lfsck_tgt_desc *ltd = NULL;
1221 struct ptlrpc_request *req = NULL;
1225 ltd = lfsck_tgt_get(&lfsck->li_mdt_descs, index);
1227 GOTO(out, rc = -ENODEV);
1229 req = ptlrpc_request_alloc(class_exp2cliimp(ltd->ltd_exp),
1232 GOTO(out, rc = -ENOMEM);
1234 rc = ptlrpc_request_pack(req, LUSTRE_OBD_VERSION, LFSCK_NOTIFY);
1236 ptlrpc_request_free(req);
1241 lr = req_capsule_client_get(&req->rq_pill, &RMF_LFSCK_REQUEST);
1242 memset(lr, 0, sizeof(*lr));
1243 lr->lr_event = event;
1244 lr->lr_index = lfsck_dev_idx(lfsck);
1245 lr->lr_active = LFSCK_TYPE_NAMESPACE;
1247 lr->lr_flags = flags;
1249 ptlrpc_request_set_replen(req);
1250 rc = ptlrpc_queue_wait(req);
1251 ptlrpc_req_finished(req);
1253 GOTO(out, rc = (rc == -ENOENT ? 1 : rc));
1256 CDEBUG(D_LFSCK, "%s: namespace LFSCK notify LMV EA updated for the "
1257 "object "DFID" on MDT %x remotely with event %u, flags %u: "
1258 "rc = %d\n", lfsck_lfsck2name(lfsck), PFID(fid), index,
1268 * Generate request for local LFSCK instance to rescan the striped directory.
1270 * \param[in] env pointer to the thread context
1271 * \param[in] com pointer to the lfsck component
1272 * \param[in] obj pointer to the striped directory to be rescanned
1274 * \retval positive number if nothing to be done
1275 * \retval zero for success
1276 * \retval negative error number on failure
1278 int lfsck_namespace_notify_lmv_master_local(const struct lu_env *env,
1279 struct lfsck_component *com,
1280 struct dt_object *obj)
1282 struct lfsck_instance *lfsck = com->lc_lfsck;
1283 struct lfsck_namespace *ns = com->lc_file_ram;
1284 struct lmv_mds_md_v1 *lmv4 = &lfsck_env_info(env)->lti_lmv4;
1285 struct lfsck_lmv_unit *llu;
1286 struct lfsck_lmv *llmv;
1287 struct lfsck_slave_lmv_rec *lslr;
1292 if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1295 rc = lfsck_read_stripe_lmv(env, obj, lmv4);
1300 if (unlikely(llu == NULL))
1303 if (lmv4->lmv_stripe_count < 1)
1304 count = LFSCK_LMV_DEF_STRIPES;
1305 else if (lmv4->lmv_stripe_count > LFSCK_LMV_MAX_STRIPES)
1306 count = LFSCK_LMV_MAX_STRIPES;
1308 count = lmv4->lmv_stripe_count;
1310 OBD_ALLOC_LARGE(lslr, sizeof(struct lfsck_slave_lmv_rec) * count);
1317 INIT_LIST_HEAD(&llu->llu_link);
1318 llu->llu_lfsck = lfsck;
1319 llu->llu_obj = lfsck_object_get(obj);
1320 llmv = &llu->llu_lmv;
1321 llmv->ll_lmv_master = 1;
1322 llmv->ll_inline = 1;
1323 atomic_set(&llmv->ll_ref, 1);
1324 llmv->ll_stripes_allocated = count;
1325 llmv->ll_hash_type = LMV_HASH_TYPE_UNKNOWN;
1326 llmv->ll_lslr = lslr;
1327 llmv->ll_lmv = *lmv4;
1329 down_write(&com->lc_sem);
1330 if (ns->ln_status != LS_SCANNING_PHASE1 &&
1331 ns->ln_status != LS_SCANNING_PHASE2) {
1332 ns->ln_striped_dirs_skipped++;
1333 up_write(&com->lc_sem);
1334 lfsck_lmv_put(env, llmv);
1336 ns->ln_striped_dirs_repaired++;
1337 llmv->ll_counted = 1;
1338 spin_lock(&lfsck->li_lock);
1339 list_add_tail(&llu->llu_link, &lfsck->li_list_lmv);
1340 spin_unlock(&lfsck->li_lock);
1341 up_write(&com->lc_sem);
1348 * Set master LMV EA for the specified striped directory.
1350 * First, if the master MDT-object of a striped directory lost its LMV EA,
1351 * then there may be some users have created some files under the master
1352 * MDT-object directly. Under such case, the LFSCK cannot re-generate LMV
1353 * EA for the master MDT-object, because we should keep the existing files
1354 * to be visible to client. Then the LFSCK will mark the striped directory
1355 * as read-only and keep it there to be handled by administrator manually.
1357 * If nobody has created files under the master MDT-object of the striped
1358 * directory, then we will set the master LMV EA and generate a new rescan
1359 * (the striped directory) request that will be handled later by the LFSCK
1360 * instance on the MDT later.
1362 * \param[in] env pointer to the thread context
1363 * \param[in] com pointer to the lfsck component
1364 * \param[in] obj pointer to the object on which the LMV EA will be set
1365 * \param[in] lmv pointer to the buffer holding the new LMV EA
1366 * \param[in] cfid the shard's FID used for verification
1367 * \param[in] cidx the shard's index used for verification
1368 * \param[in] flags to indicate which element(s) in the LMV EA will be set
1370 * \retval positive number if nothing to be done
1371 * \retval zero for success
1372 * \retval negative error number on failure
1374 static int lfsck_namespace_set_lmv_master(const struct lu_env *env,
1375 struct lfsck_component *com,
1376 struct dt_object *obj,
1377 struct lmv_mds_md_v1 *lmv,
1378 const struct lu_fid *cfid,
1379 __u32 cidx, __u32 flags)
1381 struct lfsck_thread_info *info = lfsck_env_info(env);
1382 struct lmv_mds_md_v1 *lmv3 = &info->lti_lmv3;
1383 struct lu_seq_range *range = &info->lti_range;
1384 struct lfsck_instance *lfsck = com->lc_lfsck;
1385 struct seq_server_site *ss = lfsck_dev_site(lfsck);
1386 struct lustre_handle lh = { 0 };
1391 fld_range_set_mdt(range);
1392 rc = fld_server_lookup(env, ss->ss_server_fld,
1393 fid_seq(lfsck_dto2fid(obj)), range);
1397 pidx = range->lsr_index;
1398 rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
1399 MDS_INODELOCK_UPDATE | MDS_INODELOCK_XATTR,
1404 rc = lfsck_read_stripe_lmv(env, obj, lmv3);
1405 if (rc == -ENODATA) {
1406 if (!(flags & LEF_SET_LMV_ALL))
1410 } else if (rc == 0) {
1411 if (flags & LEF_SET_LMV_ALL)
1414 if (flags & LEF_SET_LMV_HASH)
1415 lmv3->lmv_hash_type = lmv->lmv_hash_type;
1420 lmv3->lmv_magic = LMV_MAGIC;
1421 lmv3->lmv_master_mdt_index = pidx;
1422 lmv3->lmv_layout_version++;
1424 if (flags & LEF_SET_LMV_ALL) {
1425 rc = lfsck_allow_regenerate_master_lmv(env, com, obj,
1428 rc = lfsck_disable_master_lmv(env, com, obj, false);
1430 GOTO(log, rc = (rc == 0 ? 1 : rc));
1436 /* To indicate that the master has ever lost LMV EA. */
1437 lmv3->lmv_hash_type |= LMV_HASH_FLAG_LOST_LMV;
1440 rc = lfsck_namespace_update_lmv(env, com, obj, lmv3, true);
1441 if (rc == 0 && flags & LEF_SET_LMV_ALL) {
1442 if (dt_object_remote(obj))
1443 rc = lfsck_namespace_notify_lmv_remote(env, com, obj,
1444 LE_SET_LMV_MASTER, 0, pidx);
1446 rc = lfsck_namespace_notify_lmv_master_local(env, com,
1453 lfsck_ibits_unlock(&lh, LCK_EX);
1454 CDEBUG(D_LFSCK, "%s: namespace LFSCK set master LMV EA for the object "
1455 DFID" on the %s MDT %d, flags %x: rc = %d\n",
1456 lfsck_lfsck2name(lfsck), PFID(lfsck_dto2fid(obj)),
1457 dt_object_remote(obj) ? "remote" : "local", pidx, flags, rc);
1460 struct lfsck_namespace *ns = com->lc_file_ram;
1462 ns->ln_flags |= LF_INCONSISTENT;
1469 * Repair the bad name hash.
1471 * If the name hash of some name entry under the striped directory does not
1472 * match the shard of the striped directory, then the LFSCK will repair the
1473 * inconsistency. Ideally, the LFSCK should migrate the name entry from the
1474 * current MDT to the right MDT (another one), but before the async commit
1475 * finished, the LFSCK will change the striped directory's hash type as
1476 * LMV_HASH_TYPE_UNKNOWN and mark the lmv flags as LMV_HASH_FLAG_BAD_TYPE.
1478 * \param[in] env pointer to the thread context
1479 * \param[in] com pointer to the lfsck component
1480 * \param[in] shard pointer to the shard of the striped directory that
1481 * contains the bad name entry
1482 * \param[in] llmv pointer to lfsck LMV EA structure
1483 * \param[in] name the name of the bad name hash
1485 * \retval positive number if nothing to be done
1486 * \retval zero for success
1487 * \retval negative error number on failure
1489 int lfsck_namespace_repair_bad_name_hash(const struct lu_env *env,
1490 struct lfsck_component *com,
1491 struct dt_object *shard,
1492 struct lfsck_lmv *llmv,
1495 struct lfsck_thread_info *info = lfsck_env_info(env);
1496 struct lu_fid *pfid = &info->lti_fid3;
1497 struct lmv_mds_md_v1 *lmv2 = &info->lti_lmv2;
1498 struct lfsck_instance *lfsck = com->lc_lfsck;
1499 struct dt_object *parent = NULL;
1503 rc = dt_lookup(env, shard, (struct dt_rec *)pfid,
1504 (const struct dt_key *)dotdot);
1505 if (rc != 0 || !fid_is_sane(pfid))
1508 parent = lfsck_object_find_bottom(env, lfsck, pfid);
1510 GOTO(log, rc = PTR_ERR(parent));
1512 if (unlikely(!dt_object_exists(parent)))
1513 /* The parent object was previously accessed when verifying
1514 * the slave LMV EA. If this condition is true it is because
1515 * the striped directory is being removed. */
1518 *lmv2 = llmv->ll_lmv;
1519 lmv2->lmv_hash_type = LMV_HASH_TYPE_UNKNOWN | LMV_HASH_FLAG_BAD_TYPE;
1520 rc = lfsck_namespace_set_lmv_master(env, com, parent, lmv2,
1521 lfsck_dto2fid(shard),
1522 llmv->ll_lmv.lmv_master_mdt_index,
1528 CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant found bad name hash "
1529 "on the MDT %x, parent "DFID", name %s, shard_%x "DFID
1531 lfsck_lfsck2name(lfsck), lfsck_dev_idx(lfsck),
1532 PFID(pfid), name, llmv->ll_lmv.lmv_master_mdt_index,
1533 PFID(lfsck_dto2fid(shard)), rc);
1535 if (parent != NULL && !IS_ERR(parent))
1536 lfsck_object_put(env, parent);
1542 * Scan the shard of a striped directory for name hash verification.
1544 * During the first-stage scanning, if the LFSCK cannot make sure whether
1545 * the shard of a stripe directory contains valid slave LMV EA or not, then
1546 * it will skip the name hash verification for this shard temporarily, and
1547 * record the shard's FID in the LFSCK tracing file. As the LFSCK processing,
1548 * the slave LMV EA may has been verified/fixed by LFSCK instance on master.
1549 * Then in the second-stage scanning, the shard will be re-scanned, and for
1550 * every name entry under the shard, the name hash will be verified, and for
1551 * unmatched name entry, the LFSCK will try to fix it.
1553 * \param[in] env pointer to the thread context
1554 * \param[in] com pointer to the lfsck component
1555 * \param[in] child pointer to the directory object to be handled
1557 * \retval positive number for scanning successfully
1558 * \retval zero for the scanning is paused
1559 * \retval negative error number on failure
1561 int lfsck_namespace_scan_shard(const struct lu_env *env,
1562 struct lfsck_component *com,
1563 struct dt_object *child)
1565 struct lfsck_thread_info *info = lfsck_env_info(env);
1566 struct lmv_mds_md_v1 *lmv = &info->lti_lmv;
1567 struct lfsck_instance *lfsck = com->lc_lfsck;
1568 struct lfsck_namespace *ns = com->lc_file_ram;
1569 struct ptlrpc_thread *thread = &lfsck->li_thread;
1570 struct lu_dirent *ent =
1571 (struct lu_dirent *)info->lti_key;
1572 struct lfsck_bookmark *bk = &lfsck->li_bookmark_ram;
1573 struct lfsck_lmv *llmv = NULL;
1574 const struct dt_it_ops *iops;
1582 rc = lfsck_read_stripe_lmv(env, child, lmv);
1584 RETURN(rc == -ENODATA ? 1 : rc);
1586 if (lmv->lmv_magic != LMV_MAGIC_STRIPE)
1589 if (unlikely(!dt_try_as_dir(env, child)))
1592 OBD_ALLOC_PTR(llmv);
1596 llmv->ll_lmv_slave = 1;
1597 llmv->ll_lmv_verified = 1;
1598 llmv->ll_lmv = *lmv;
1599 atomic_set(&llmv->ll_ref, 1);
1601 args = lfsck->li_args_dir & ~(LUDA_VERIFY | LUDA_VERIFY_DRYRUN);
1602 iops = &child->do_index_ops->dio_it;
1603 di = iops->init(env, child, args);
1605 GOTO(out, rc = PTR_ERR(di));
1607 rc = iops->load(env, di, 0);
1609 rc = iops->next(env, di);
1614 if (CFS_FAIL_TIMEOUT(OBD_FAIL_LFSCK_DELAY3, cfs_fail_val) &&
1615 unlikely(!thread_is_running(thread)))
1618 rc = iops->rec(env, di, (struct dt_rec *)ent, args);
1620 rc = lfsck_unpack_ent(ent, &cookie, &type);
1623 if (bk->lb_param & LPF_FAILOUT)
1629 /* skip dot and dotdot entries */
1630 if (name_is_dot_or_dotdot(ent->lde_name, ent->lde_namelen))
1633 if (!lfsck_is_valid_slave_name_entry(env, llmv, ent->lde_name,
1634 ent->lde_namelen)) {
1635 ns->ln_flags |= LF_INCONSISTENT;
1636 rc = lfsck_namespace_repair_bad_name_hash(env, com,
1637 child, llmv, ent->lde_name);
1639 ns->ln_name_hash_repaired++;
1642 if (rc < 0 && bk->lb_param & LPF_FAILOUT)
1646 lfsck_control_speed(lfsck);
1647 if (unlikely(!thread_is_running(thread)))
1650 if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_FATAL2)) {
1651 spin_lock(&lfsck->li_lock);
1652 thread_set_flags(thread, SVC_STOPPING);
1653 spin_unlock(&lfsck->li_lock);
1655 GOTO(out, rc = -EINVAL);
1659 rc = iops->next(env, di);
1666 iops->fini(env, di);
1667 lfsck_lmv_put(env, llmv);
1673 * Verify the slave object's (of striped directory) LMV EA.
1675 * For the slave object of a striped directory, before traversing the shard
1676 * the LFSCK will verify whether its slave LMV EA matches its parent's master
1679 * \param[in] env pointer to the thread context
1680 * \param[in] com pointer to the lfsck component
1681 * \param[in] obj pointer to the object which LMV EA will be checked
1682 * \param[in] llmv pointer to buffer holding the slave LMV EA
1684 * \retval positive number if nothing to be done
1685 * \retval zero for success
1686 * \retval negative error number on failure
1688 int lfsck_namespace_verify_stripe_slave(const struct lu_env *env,
1689 struct lfsck_component *com,
1690 struct dt_object *obj,
1691 struct lfsck_lmv *llmv)
1693 struct lfsck_thread_info *info = lfsck_env_info(env);
1694 char *name = info->lti_key;
1696 struct lu_fid *pfid = &info->lti_fid3;
1697 const struct lu_fid *cfid = lfsck_dto2fid(obj);
1699 struct lfsck_instance *lfsck = com->lc_lfsck;
1700 struct lmv_mds_md_v1 *clmv = &llmv->ll_lmv;
1701 struct lmv_mds_md_v1 *plmv = &info->lti_lmv;
1702 struct dt_object *parent = NULL;
1706 if (!lfsck_is_valid_slave_lmv(clmv)) {
1707 rc = lfsck_namespace_trace_update(env, com, cfid,
1708 LNTF_UNCERTAIN_LMV, true);
1713 rc = dt_lookup(env, obj, (struct dt_rec *)pfid,
1714 (const struct dt_key *)dotdot);
1715 if (rc != 0 || !fid_is_sane(pfid)) {
1716 rc = lfsck_namespace_trace_update(env, com, cfid,
1717 LNTF_UNCERTAIN_LMV, true);
1722 CFS_FAIL_TIMEOUT(OBD_FAIL_LFSCK_ENGINE_DELAY, cfs_fail_val);
1724 parent = lfsck_object_find_bottom(env, lfsck, pfid);
1725 if (IS_ERR(parent)) {
1726 rc = lfsck_namespace_trace_update(env, com, cfid,
1727 LNTF_UNCERTAIN_LMV, true);
1732 if (unlikely(!dt_object_exists(parent)))
1735 if (unlikely(!dt_try_as_dir(env, parent)))
1736 GOTO(out, rc = -ENOTDIR);
1738 rc = lfsck_read_stripe_lmv(env, parent, plmv);
1742 /* If the parent has no LMV EA, then it maybe because:
1743 * 1) The parent lost the LMV EA.
1744 * 2) The child claims a wrong (slave) LMV EA. */
1746 rc = lfsck_namespace_set_lmv_master(env, com, parent,
1747 clmv, cfid, clmv->lmv_master_mdt_index,
1752 rc1 = lfsck_namespace_trace_update(env, com, cfid,
1753 LNTF_UNCERTAIN_LMV, true);
1755 GOTO(out, rc = (rc < 0 ? rc : rc1));
1758 /* Unmatched magic or stripe count. */
1759 if (unlikely(plmv->lmv_magic != LMV_MAGIC ||
1760 plmv->lmv_stripe_count != clmv->lmv_stripe_count)) {
1761 rc = lfsck_namespace_trace_update(env, com, cfid,
1762 LNTF_UNCERTAIN_LMV, true);
1767 /* If the master hash type has been set as LMV_HASH_TYPE_UNKNOWN,
1768 * then the slave hash type is not important. */
1769 if ((plmv->lmv_hash_type & LMV_HASH_TYPE_MASK) ==
1770 LMV_HASH_TYPE_UNKNOWN &&
1771 plmv->lmv_hash_type & LMV_HASH_FLAG_BAD_TYPE)
1774 /* Unmatched hash type. */
1775 if (unlikely((plmv->lmv_hash_type & LMV_HASH_TYPE_MASK) !=
1776 (clmv->lmv_hash_type & LMV_HASH_TYPE_MASK))) {
1777 rc = lfsck_namespace_trace_update(env, com, cfid,
1778 LNTF_UNCERTAIN_LMV, true);
1783 snprintf(info->lti_tmpbuf2, sizeof(info->lti_tmpbuf2), DFID":%u",
1784 PFID(cfid), clmv->lmv_master_mdt_index);
1785 name2 = info->lti_tmpbuf2;
1787 rc = lfsck_links_get_first(env, obj, name, &tfid);
1788 if (rc == 0 && strcmp(name, name2) == 0 && lu_fid_eq(pfid, &tfid)) {
1789 llmv->ll_lmv_verified = 1;
1794 rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
1795 (const struct dt_key *)name2);
1796 if (rc != 0 || !lu_fid_eq(cfid, &tfid))
1797 rc = lfsck_namespace_trace_update(env, com, cfid,
1798 LNTF_UNCERTAIN_LMV, true);
1800 llmv->ll_lmv_verified = 1;
1805 if (parent != NULL && !IS_ERR(parent))
1806 lfsck_object_put(env, parent);
1812 * Double scan the striped directory or the shard.
1814 * All the shards' under the given striped directory or its shard have
1815 * been scanned, the LFSCK has got the global knownledge about the LMV
1818 * If the target is one shard of a striped directory, then only needs to
1819 * update related tracing file.
1821 * If the target is the master MDT-object of a striped directory, then the
1822 * LFSCK will make the decision about whether the master LMV EA is invalid
1823 * or not, and repair it if inconsistenct; for every shard of the striped
1824 * directory, whether the slave LMV EA is invalid or not, and repair it if
1827 * \param[in] env pointer to the thread context
1828 * \param[in] com pointer to the lfsck component
1829 * \param[in] lnr pointer to the namespace request that contains the
1830 * striped directory or the shard
1832 * \retval zero for success
1833 * \retval negative error number on failure
1835 int lfsck_namespace_striped_dir_rescan(const struct lu_env *env,
1836 struct lfsck_component *com,
1837 struct lfsck_namespace_req *lnr)
1839 struct lfsck_thread_info *info = lfsck_env_info(env);
1840 struct lfsck_instance *lfsck = com->lc_lfsck;
1841 struct lfsck_namespace *ns = com->lc_file_ram;
1842 struct lfsck_lmv *llmv = lnr->lnr_lmv;
1843 struct lmv_mds_md_v1 *lmv = &llmv->ll_lmv;
1844 struct lmv_mds_md_v1 *lmv2 = &info->lti_lmv2;
1845 struct lfsck_assistant_object *lso = lnr->lnr_lar.lar_parent;
1846 const struct lu_fid *pfid = &lso->lso_fid;
1847 struct dt_object *dir = NULL;
1848 struct dt_object *obj = NULL;
1849 struct lu_seq_range *range = &info->lti_range;
1850 struct seq_server_site *ss = lfsck_dev_site(lfsck);
1857 if (llmv->ll_lmv_slave) {
1858 if (llmv->ll_lmv_verified) {
1859 ns->ln_striped_shards_scanned++;
1860 lfsck_namespace_trace_update(env, com, pfid,
1861 LNTF_UNCERTAIN_LMV |
1862 LNTF_RECHECK_NAME_HASH, false);
1868 /* Either the striped directory has been disabled or only part of
1869 * the striped directory have been scanned. The LFSCK cannot repair
1870 * something based on incompleted knowledge. So skip it. */
1871 if (llmv->ll_ignore || llmv->ll_exit_value <= 0)
1874 /* There ever been some failure, as to the LFSCK cannot know whether
1875 * it has got the global knowledge about the LMV EA consistency or not,
1876 * so it cannot make reparation about the incompleted knowledge. */
1877 if (llmv->ll_failed) {
1878 ns->ln_striped_dirs_scanned++;
1879 ns->ln_striped_dirs_failed++;
1884 if (lmv->lmv_stripe_count > LFSCK_LMV_MAX_STRIPES)
1885 stripe_count = max(llmv->ll_max_filled_off + 1,
1886 llmv->ll_max_stripe_count);
1888 stripe_count = max(llmv->ll_max_filled_off + 1,
1889 lmv->lmv_stripe_count);
1891 if (lmv->lmv_stripe_count != stripe_count) {
1892 lmv->lmv_stripe_count = stripe_count;
1893 llmv->ll_lmv_updated = 1;
1896 if (!lmv_is_known_hash_type(lmv->lmv_hash_type) &&
1897 !(lmv->lmv_hash_type & LMV_HASH_FLAG_BAD_TYPE) &&
1898 lmv_is_known_hash_type(llmv->ll_hash_type)) {
1899 hash_type = llmv->ll_hash_type & LMV_HASH_TYPE_MASK;
1900 lmv->lmv_hash_type = llmv->ll_hash_type;
1901 llmv->ll_lmv_updated = 1;
1903 hash_type = lmv->lmv_hash_type & LMV_HASH_TYPE_MASK;
1904 if (!lmv_is_known_hash_type(hash_type))
1905 hash_type = LMV_HASH_TYPE_UNKNOWN;
1908 if (llmv->ll_lmv_updated) {
1910 dir = lfsck_assistant_object_load(env, lfsck, lso);
1914 RETURN(rc == -ENOENT ? 0 : rc);
1918 lmv->lmv_layout_version++;
1919 rc = lfsck_namespace_update_lmv(env, com, dir, lmv, false);
1923 ns->ln_striped_dirs_scanned++;
1924 if (!llmv->ll_counted)
1925 ns->ln_striped_dirs_repaired++;
1928 fld_range_set_mdt(range);
1929 for (i = 0; i <= llmv->ll_max_filled_off; i++) {
1930 struct lfsck_slave_lmv_rec *lslr = llmv->ll_lslr + i;
1931 const struct lu_fid *cfid = &lslr->lslr_fid;
1932 const struct lu_name *cname;
1933 struct linkea_data ldata = { NULL };
1935 bool repair_linkea = false;
1936 bool repair_lmvea = false;
1937 bool rename = false;
1938 bool create = false;
1939 bool linkea_repaired = false;
1940 bool lmvea_repaired = false;
1941 bool rename_repaired = false;
1942 bool create_repaired = false;
1945 if (fid_is_zero(cfid))
1948 lnr->lnr_fid = *cfid;
1949 lnr->lnr_namelen = snprintf(lnr->lnr_name,
1950 lnr->lnr_size - sizeof(*lnr),
1951 DFID":%u", PFID(cfid), i);
1952 cname = lfsck_name_get_const(env, lnr->lnr_name,
1954 obj = lfsck_object_find_bottom(env, lfsck, cfid);
1957 dir = lfsck_assistant_object_load(env, lfsck,
1960 if (PTR_ERR(dir) == -ENOENT)
1965 } else if (lfsck_is_dead_obj(dir)) {
1973 switch (lslr->lslr_flags) {
1975 if (llmv->ll_inline ||
1976 lslr->lslr_stripe_count != stripe_count ||
1977 (lslr->lslr_hash_type & LMV_HASH_TYPE_MASK) !=
1979 repair_lmvea = true;
1981 case LSLF_BAD_INDEX2:
1982 /* The index in the slave LMV EA is right,
1983 * the name entry should be updated. */
1985 snprintf(info->lti_tmpbuf2, sizeof(info->lti_tmpbuf2),
1986 DFID":%u", PFID(cfid), lslr->lslr_index);
1987 if (llmv->ll_inline ||
1988 lslr->lslr_stripe_count != stripe_count ||
1989 (lslr->lslr_hash_type & LMV_HASH_TYPE_MASK) !=
1991 repair_lmvea = true;
1993 case LSLF_BAD_INDEX1:
1994 /* The index in the name entry is right,
1995 * the slave LMV EA should be updated. */
1997 repair_lmvea = true;
2006 rc1 = lfsck_links_read_with_rec(env, obj, &ldata);
2007 if (rc1 == -ENOENT) {
2012 if (rc1 == -EINVAL || rc1 == -ENODATA) {
2013 repair_linkea = true;
2020 if (ldata.ld_leh->leh_reccount != 1) {
2021 repair_linkea = true;
2025 rc1 = linkea_links_find(&ldata, cname, pfid);
2027 repair_linkea = true;
2032 dir = lfsck_assistant_object_load(env, lfsck,
2045 rc1 = lfsck_namespace_repair_dangling(env, com, dir,
2048 create_repaired = true;
2050 ns->ln_dangling_repaired++;
2056 lmv2->lmv_magic = LMV_MAGIC_STRIPE;
2057 lmv2->lmv_stripe_count = stripe_count;
2058 lmv2->lmv_master_mdt_index = i;
2059 lmv2->lmv_hash_type = hash_type;
2061 rc1 = lfsck_namespace_update_lmv(env, com, obj,
2066 if (dt_object_remote(obj)) {
2067 rc1 = fld_server_lookup(env, ss->ss_server_fld,
2068 fid_seq(lfsck_dto2fid(obj)), range);
2072 rc1 = lfsck_namespace_notify_lmv_remote(env,
2073 com, obj, LE_SET_LMV_SLAVE, 0,
2076 ns->ln_striped_shards_repaired++;
2077 rc1 = lfsck_namespace_trace_update(env, com,
2078 cfid, LNTF_RECHECK_NAME_HASH, true);
2085 lmvea_repaired = true;
2086 } else if (llmv->ll_inline) {
2087 if (dt_object_remote(obj)) {
2088 rc1 = fld_server_lookup(env, ss->ss_server_fld,
2089 fid_seq(lfsck_dto2fid(obj)), range);
2093 /* The slave LMV EA on the remote shard is
2094 * correct, just notify the LFSCK instance
2095 * on such MDT to re-verify the name_hash. */
2096 rc1 = lfsck_namespace_notify_lmv_remote(env,
2097 com, obj, LE_SET_LMV_SLAVE,
2098 LEF_RECHECK_NAME_HASH,
2101 rc1 = lfsck_namespace_trace_update(env, com,
2102 cfid, LNTF_RECHECK_NAME_HASH, true);
2111 dir = lfsck_assistant_object_load(env, lfsck,
2124 rc1 = lfsck_namespace_repair_dirent(env, com, dir, obj,
2125 info->lti_tmpbuf2, lnr->lnr_name,
2126 lnr->lnr_type, true, false);
2128 rename_repaired = true;
2130 ns->ln_dirent_repaired++;
2131 rc1 = lfsck_namespace_trace_update(env,
2133 LNTF_RECHECK_NAME_HASH, true);
2141 if (repair_linkea) {
2142 struct lustre_handle lh = { 0 };
2144 rc1 = linkea_links_new(&ldata, &info->lti_big_buf,
2145 cname, lfsck_dto2fid(dir));
2150 dir = lfsck_assistant_object_load(env, lfsck,
2163 rc1 = lfsck_ibits_lock(env, lfsck, obj, &lh,
2164 MDS_INODELOCK_UPDATE |
2165 MDS_INODELOCK_XATTR, LCK_EX);
2169 rc1 = lfsck_namespace_rebuild_linkea(env, com, obj,
2171 lfsck_ibits_unlock(&lh, LCK_EX);
2173 linkea_repaired = true;
2175 ns->ln_linkea_repaired++;
2180 CDEBUG(D_LFSCK, "%s: namespace LFSCK repair the shard "
2181 "%d "DFID" of the striped directory "DFID" with "
2182 "dangling %s/%s, rename %s/%s, llinkea %s/%s, "
2183 "repair_lmvea %s/%s: rc = %d\n", lfsck_lfsck2name(lfsck),
2184 i, PFID(cfid), PFID(pfid),
2185 create ? "yes" : "no", create_repaired ? "yes" : "no",
2186 rename ? "yes" : "no", rename_repaired ? "yes" : "no",
2187 repair_linkea ? "yes" : "no",
2188 linkea_repaired ? "yes" : "no",
2189 repair_lmvea ? "yes" : "no",
2190 lmvea_repaired ? "yes" : "no", rc1);
2192 if (obj != NULL && !IS_ERR(obj)) {
2193 lfsck_object_put(env, obj);
2199 ns->ln_striped_shards_failed++;
2206 if (obj != NULL && !IS_ERR(obj))
2207 lfsck_object_put(env, obj);
2209 if (dir != NULL && !IS_ERR(dir))
2210 lfsck_object_put(env, dir);
2216 * Verify the shard's name entry under the striped directory.
2218 * Before all shards of the striped directory scanned, the LFSCK cannot
2219 * know whether the master LMV EA is valid or not, and also cannot know
2220 * how to repair an invalid shard exactly. For example, the stripe index
2221 * stored in the shard's name does not match the stripe index stored in
2222 * the slave LMV EA, then the LFSCK cannot know which one is correct.
2223 * If the LFSCK just assumed one is correct, and fixed the other, then
2224 * as the LFSCK processing, it may find that the former reparation is
2225 * wrong and have to roll back. Unfortunately, if some applications saw
2226 * the changes and made further modification based on such changes, then
2227 * the roll back is almost impossible.
2229 * To avoid above trouble, the LFSCK will scan the master object of the
2230 * striped directory twice, that is NOT the same as normal two-stages
2231 * scanning, the double scanning the striped directory will happen both
2232 * during the first-stage scanning:
2234 * 1) When the striped directory is opened for scanning, the LFSCK will
2235 * iterate each shard in turn, and records its slave LMV EA in the
2236 * lfsck_lmv::ll_lslr. In this step, if the 'shard' (may be fake
2237 * shard) name does not match the shard naming rule, for example, it
2238 * does not contains the shard's FID, or not contains index, then we
2239 * can remove the bad name entry directly. But if the name is valid,
2240 * but the shard has no slave LMV EA or the slave LMV EA does not
2241 * match its name, then we just record related information in the
2242 * lfsck_lmv::ll_lslr in RAM.
2244 * 2) When all the known shards have been scanned, then the engine will
2245 * generate a dummy request (via lfsck_namespace_close_dir) to tell
2246 * the assistant thread that all the known shards have been scanned.
2247 * Since the assistant has got the global knowledge about the index
2248 * conflict, stripe count, hash type, and so on. Then the assistant
2249 * thread will scan the lfsck_lmv::ll_lslr, and for every shard in
2250 * the record, check and repair inconsistency.
2252 * Generally, the stripe directory has only several shards, and there
2253 * will NOT be a lof of striped directory. So double scanning striped
2254 * directory will not much affect the LFSCK performance.
2256 * \param[in] env pointer to the thread context
2257 * \param[in] com pointer to the lfsck component
2258 * \param[in] lnr pointer to the namespace request that contains the
2259 * shard's name, parent object, parent's LMV, and ect.
2261 * \retval zero for success
2262 * \retval negative error number on failure
2264 int lfsck_namespace_handle_striped_master(const struct lu_env *env,
2265 struct lfsck_component *com,
2266 struct lfsck_namespace_req *lnr)
2268 struct lfsck_thread_info *info = lfsck_env_info(env);
2269 struct lmv_mds_md_v1 *lmv = &info->lti_lmv;
2270 struct lfsck_instance *lfsck = com->lc_lfsck;
2271 struct lfsck_namespace *ns = com->lc_file_ram;
2272 struct lfsck_lmv *llmv = lnr->lnr_lmv;
2273 struct lfsck_assistant_object *lso = lnr->lnr_lar.lar_parent;
2274 const struct lu_fid *pfid = &lso->lso_fid;
2275 struct dt_object *dir;
2276 struct dt_object *obj = NULL;
2277 struct dt_device *dev = NULL;
2282 bool repaired = false;
2283 enum lfsck_namespace_inconsistency_type type = LNIT_NONE;
2286 if (unlikely(llmv->ll_ignore))
2289 dir = lfsck_assistant_object_load(env, lfsck, lso);
2293 RETURN(rc == -ENOENT ? 0 : rc);
2296 shard_idx = lfsck_find_mdt_idx_by_fid(env, lfsck, &lnr->lnr_fid);
2298 GOTO(fail_lmv, rc = shard_idx);
2300 if (shard_idx == lfsck_dev_idx(lfsck)) {
2301 if (unlikely(strcmp(lnr->lnr_name, dotdot) == 0))
2304 dev = lfsck->li_bottom;
2306 struct lfsck_tgt_desc *ltd;
2308 /* Usually, some local filesystem consistency verification
2309 * tools can guarantee the local namespace tree consistenct.
2310 * So the LFSCK will only verify the remote directory. */
2311 if (unlikely(strcmp(lnr->lnr_name, dotdot) == 0)) {
2312 rc = lfsck_namespace_trace_update(env, com, pfid,
2313 LNTF_CHECK_PARENT, true);
2318 ltd = lfsck_ltd2tgt(&lfsck->li_mdt_descs, shard_idx);
2319 if (unlikely(ltd == NULL)) {
2320 CDEBUG(D_LFSCK, "%s: cannot talk with MDT %x which "
2321 "did not join the namespace LFSCK\n",
2322 lfsck_lfsck2name(lfsck), shard_idx);
2323 lfsck_lad_set_bitmap(env, com, shard_idx);
2325 GOTO(fail_lmv, rc = -ENODEV);
2331 obj = lfsck_object_find_by_dev(env, dev, &lnr->lnr_fid);
2333 if (lfsck_is_dead_obj(dir))
2336 GOTO(fail_lmv, rc = PTR_ERR(obj));
2339 if (!dt_object_exists(obj)) {
2340 stripe = lfsck_shard_name_to_index(env, lnr->lnr_name,
2341 lnr->lnr_namelen, lnr->lnr_type, &lnr->lnr_fid);
2343 type = LNIT_BAD_DIRENT;
2349 rc = lfsck_namespace_check_exist(env, dir, obj, lnr->lnr_name);
2351 memset(lmv, 0, sizeof(*lmv));
2352 lmv->lmv_magic = LMV_MAGIC;
2353 rc = lfsck_record_lmv(env, com, dir, lnr, lmv, stripe,
2354 LSLF_DANGLING, LSLF_NONE, &depth);
2360 stripe = lfsck_shard_name_to_index(env, lnr->lnr_name, lnr->lnr_namelen,
2361 lfsck_object_type(obj),
2364 type = LNIT_BAD_DIRENT;
2369 rc = lfsck_read_stripe_lmv(env, obj, lmv);
2370 if (unlikely(rc == -ENOENT))
2371 /* It may happen when the remote object has been removed,
2372 * but the local MDT does not aware of that. */
2376 rc = lfsck_record_lmv(env, com, dir, lnr, lmv, stripe,
2377 LSLF_NO_LMVEA, LSLF_NONE, &depth);
2379 rc = lfsck_record_lmv(env, com, dir, lnr, lmv, stripe,
2380 lmv->lmv_master_mdt_index != stripe ?
2381 LSLF_BAD_INDEX1 : LSLF_NONE, LSLF_NONE,
2387 llmv->ll_failed = 1;
2390 if (rc >= 0 && type == LNIT_NONE && !S_ISDIR(lnr->lnr_type))
2391 type = LNIT_BAD_TYPE;
2395 rc = lfsck_namespace_repair_dirent(env, com, dir, obj,
2396 lnr->lnr_name, lnr->lnr_name,
2397 lnr->lnr_type, true, false);
2401 case LNIT_BAD_DIRENT:
2402 rc = lfsck_namespace_repair_dirent(env, com, dir, obj,
2403 lnr->lnr_name, lnr->lnr_name,
2404 lnr->lnr_type, false, false);
2413 CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant fail to handle "
2414 "the shard: "DFID", parent "DFID", name %.*s: rc = %d\n",
2415 lfsck_lfsck2name(lfsck), PFID(&lnr->lnr_fid),
2416 PFID(pfid), lnr->lnr_namelen, lnr->lnr_name, rc);
2418 if ((rc == -ENOTCONN || rc == -ESHUTDOWN || rc == -EREMCHG ||
2419 rc == -ETIMEDOUT || rc == -EHOSTDOWN ||
2420 rc == -EHOSTUNREACH || rc == -EINPROGRESS) &&
2421 dev != NULL && dev != lfsck->li_bottom)
2422 lfsck_lad_set_bitmap(env, com, shard_idx);
2424 if (!(lfsck->li_bookmark_ram.lb_param & LPF_FAILOUT))
2428 ns->ln_items_repaired++;
2432 ns->ln_bad_type_repaired++;
2434 case LNIT_BAD_DIRENT:
2435 ns->ln_dirent_repaired++;
2445 if (obj != NULL && !IS_ERR(obj))
2446 lfsck_object_put(env, obj);
2448 lfsck_object_put(env, dir);