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, 2015, 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)
844 dt_read_lock(env, obj, 0);
845 rc = dt_xattr_get(env, obj, lfsck_buf_get(env, lmv, sizeof(*lmv)),
847 dt_read_unlock(env, obj);
848 if (rc != sizeof(*lmv))
849 return rc > 0 ? -EINVAL : rc;
851 lfsck_lmv_header_le_to_cpu(lmv, lmv);
852 if ((lmv->lmv_magic == LMV_MAGIC &&
853 !(lmv->lmv_hash_type & LMV_HASH_FLAG_MIGRATION)) ||
854 (lmv->lmv_magic == LMV_MAGIC_STRIPE &&
855 !(lmv->lmv_hash_type & LMV_HASH_FLAG_DEAD)))
862 * Parse the shard's index from the given shard name.
864 * The valid shard name/type should be:
865 * 1) The type must be S_IFDIR
866 * 2) The name should be $FID:$index
867 * 3) the index should within valid range.
869 * \param[in] env pointer to the thread context
870 * \param[in] name the shard name
871 * \param[in] namelen the name length
872 * \param[in] type the entry's type
873 * \param[in] fid the entry's FID
875 * \retval zero or positive number for the index from the name
876 * \retval negative error number on failure
878 int lfsck_shard_name_to_index(const struct lu_env *env, const char *name,
879 int namelen, __u16 type, const struct lu_fid *fid)
881 char *name2 = lfsck_env_info(env)->lti_tmpbuf2;
888 LASSERT(name != name2);
890 len = snprintf(name2, sizeof(lfsck_env_info(env)->lti_tmpbuf2),
892 if (namelen < len + 1 || memcmp(name, name2, len) != 0)
896 if (!isdigit(name[len]))
899 idx = idx * 10 + name[len++] - '0';
900 } while (len < namelen);
902 if (idx >= LFSCK_LMV_MAX_STRIPES)
908 bool lfsck_is_valid_slave_name_entry(const struct lu_env *env,
909 struct lfsck_lmv *llmv,
910 const char *name, int namelen)
912 struct lmv_mds_md_v1 *lmv;
915 if (llmv == NULL || !llmv->ll_lmv_slave || !llmv->ll_lmv_verified)
919 idx = lmv_name_to_stripe_index(lmv->lmv_hash_type,
920 lmv->lmv_stripe_count,
922 if (unlikely(idx != lmv->lmv_master_mdt_index))
929 * Check whether the given name is a valid entry under the @parent.
931 * If the @parent is a striped directory then the @child should one
932 * shard of the striped directory, its name should be $FID:$index.
934 * If the @parent is a shard of a striped directory, then the name hash
935 * should match the MDT, otherwise it is invalid.
937 * \param[in] env pointer to the thread context
938 * \param[in] parent the parent directory
939 * \param[in] child the child object to be checked
940 * \param[in] cname the name for the @child in the parent directory
942 * \retval positive number for invalid name entry
943 * \retval 0 if the name is valid or uncertain
944 * \retval negative error number on failure
946 int lfsck_namespace_check_name(const struct lu_env *env,
947 struct dt_object *parent,
948 struct dt_object *child,
949 const struct lu_name *cname)
951 struct lmv_mds_md_v1 *lmv = &lfsck_env_info(env)->lti_lmv;
955 rc = lfsck_read_stripe_lmv(env, parent, lmv);
957 RETURN(rc == -ENODATA ? 0 : rc);
959 if (lmv->lmv_magic == LMV_MAGIC_STRIPE) {
960 if (!lfsck_is_valid_slave_lmv(lmv))
963 idx = lmv_name_to_stripe_index(lmv->lmv_hash_type,
964 lmv->lmv_stripe_count,
967 if (unlikely(idx != lmv->lmv_master_mdt_index))
969 } else if (lfsck_shard_name_to_index(env, cname->ln_name,
970 cname->ln_namelen, lfsck_object_type(child),
971 lfsck_dto2fid(child)) < 0) {
979 * Update the object's LMV EA with the given @lmv.
981 * \param[in] env pointer to the thread context
982 * \param[in] com pointer to the lfsck component
983 * \param[in] obj pointer to the object which LMV EA will be updated
984 * \param[in] lmv pointer to buffer holding the new LMV EA
985 * \param[in] locked whether the caller has held ldlm lock on the @obj or not
987 * \retval positive number for nothing to be done
988 * \retval zero if updated successfully
989 * \retval negative error number on failure
991 int lfsck_namespace_update_lmv(const struct lu_env *env,
992 struct lfsck_component *com,
993 struct dt_object *obj,
994 struct lmv_mds_md_v1 *lmv, bool locked)
996 struct lfsck_thread_info *info = lfsck_env_info(env);
997 struct lmv_mds_md_v1 *lmv4 = &info->lti_lmv4;
998 struct lu_buf *buf = &info->lti_buf;
999 struct lfsck_instance *lfsck = com->lc_lfsck;
1000 struct dt_device *dev = lfsck_obj2dev(obj);
1001 struct thandle *th = NULL;
1002 struct lustre_handle lh = { 0 };
1007 LASSERT(lmv4 != lmv);
1009 lfsck_lmv_header_cpu_to_le(lmv4, lmv);
1010 lfsck_buf_init(buf, lmv4, sizeof(*lmv4));
1013 rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
1014 MDS_INODELOCK_UPDATE |
1015 MDS_INODELOCK_XATTR, LCK_EX);
1020 th = dt_trans_create(env, dev);
1022 GOTO(log, rc = PTR_ERR(th));
1024 /* For remote updating LMV EA, there will be further LFSCK action on
1025 * remote MDT after the updating, so update the LMV EA synchronously. */
1026 if (dt_object_remote(obj))
1029 rc = dt_declare_xattr_set(env, obj, buf, XATTR_NAME_LMV, 0, th);
1033 rc = dt_trans_start_local(env, dev, th);
1037 dt_write_lock(env, obj, 0);
1038 if (unlikely(lfsck_is_dead_obj(obj)))
1039 GOTO(unlock, rc = 1);
1041 if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1042 GOTO(unlock, rc = 0);
1044 rc = dt_xattr_set(env, obj, buf, XATTR_NAME_LMV, 0, th);
1049 dt_write_unlock(env, obj);
1052 rc1 = dt_trans_stop(env, dev, th);
1057 lfsck_ibits_unlock(&lh, LCK_EX);
1058 CDEBUG(D_LFSCK, "%s: namespace LFSCK updated the %s LMV EA "
1059 "for the object "DFID": rc = %d\n",
1060 lfsck_lfsck2name(lfsck),
1061 lmv->lmv_magic == LMV_MAGIC ? "master" : "slave",
1062 PFID(lfsck_dto2fid(obj)), rc);
1068 * Check whether allow to re-genereate the lost master LMV EA.
1070 * If the master MDT-object of the striped directory lost its master LMV EA,
1071 * then before the LFSCK repaired the striped directory, some ones may have
1072 * created some objects (that are not normal shards of the striped directory)
1073 * under the master MDT-object. If such case happend, then the LFSCK cannot
1074 * re-generate the lost master LMV EA to keep those objects to be visible to
1077 * \param[in] env pointer to the thread context
1078 * \param[in] com pointer to the lfsck component
1079 * \param[in] obj pointer to the master MDT-object to be checked
1080 * \param[in] cfid the shard's FID used for verification
1081 * \param[in] cidx the shard's index used for verification
1083 * \retval positive number if not allow to re-generate LMV EA
1084 * \retval zero if allow to re-generate LMV EA
1085 * \retval negative error number on failure
1087 static int lfsck_allow_regenerate_master_lmv(const struct lu_env *env,
1088 struct lfsck_component *com,
1089 struct dt_object *obj,
1090 const struct lu_fid *cfid,
1093 struct lfsck_thread_info *info = lfsck_env_info(env);
1094 struct lu_fid *tfid = &info->lti_fid3;
1095 struct lfsck_instance *lfsck = com->lc_lfsck;
1096 struct lu_dirent *ent =
1097 (struct lu_dirent *)info->lti_key;
1098 const struct dt_it_ops *iops;
1106 if (unlikely(!dt_try_as_dir(env, obj)))
1109 /* Check whether the shard and the master MDT-object matches or not. */
1110 snprintf(info->lti_tmpbuf, sizeof(info->lti_tmpbuf), DFID":%u",
1112 rc = dt_lookup(env, obj, (struct dt_rec *)tfid,
1113 (const struct dt_key *)info->lti_tmpbuf);
1117 if (!lu_fid_eq(tfid, cfid))
1120 args = lfsck->li_args_dir & ~(LUDA_VERIFY | LUDA_VERIFY_DRYRUN);
1121 iops = &obj->do_index_ops->dio_it;
1122 di = iops->init(env, obj, args);
1124 RETURN(PTR_ERR(di));
1126 rc = iops->load(env, di, 0);
1128 rc = iops->next(env, di);
1136 rc = iops->rec(env, di, (struct dt_rec *)ent, args);
1138 rc = lfsck_unpack_ent(ent, &cookie, &type);
1143 /* skip dot and dotdot entries */
1144 if (name_is_dot_or_dotdot(ent->lde_name, ent->lde_namelen))
1147 /* If the subdir name does not match the shard name rule, then
1148 * it is quite possible that it is NOT a shard, but created by
1149 * someone after the master MDT-object lost the master LMV EA.
1150 * But it is also possible that the subdir name entry crashed,
1151 * under such double failure cases, the LFSCK cannot know how
1152 * to repair the inconsistency. For data safe, the LFSCK will
1153 * mark the master MDT-object as read-only. The administrator
1154 * can fix the bad shard name manually, then run LFSCK again.
1156 * XXX: If the subdir name matches the shard name rule, but it
1157 * is not a real shard of the striped directory, instead,
1158 * it was created by someone after the master MDT-object
1159 * lost the LMV EA, then re-generating the master LMV EA
1160 * will cause such subdir to be invisible to client, and
1161 * if its index occupies some lost shard index, then the
1162 * LFSCK will use it to replace the bad shard, and cause
1163 * the subdir (itself) to be invisible for ever. */
1164 if (lfsck_shard_name_to_index(env, ent->lde_name,
1165 ent->lde_namelen, type, &ent->lde_fid) < 0)
1169 rc = iops->next(env, di);
1176 iops->fini(env, di);
1182 * Notify remote LFSCK instance that the object's LMV EA has been updated.
1184 * \param[in] env pointer to the thread context
1185 * \param[in] com pointer to the lfsck component
1186 * \param[in] obj pointer to the object on which the LMV EA will be set
1187 * \param[in] event indicate either master or slave LMV EA has been updated
1188 * \param[in] flags indicate which element(s) in the LMV EA has been updated
1189 * \param[in] index the MDT index on which the LFSCK instance to be notified
1191 * \retval positive number if nothing to be done
1192 * \retval zero for success
1193 * \retval negative error number on failure
1195 static int lfsck_namespace_notify_lmv_remote(const struct lu_env *env,
1196 struct lfsck_component *com,
1197 struct dt_object *obj,
1198 __u32 event, __u32 flags,
1201 struct lfsck_request *lr = &lfsck_env_info(env)->lti_lr;
1202 const struct lu_fid *fid = lfsck_dto2fid(obj);
1203 struct lfsck_instance *lfsck = com->lc_lfsck;
1204 struct lfsck_tgt_desc *ltd = NULL;
1205 struct ptlrpc_request *req = NULL;
1209 ltd = lfsck_tgt_get(&lfsck->li_mdt_descs, index);
1211 GOTO(out, rc = -ENODEV);
1213 req = ptlrpc_request_alloc(class_exp2cliimp(ltd->ltd_exp),
1216 GOTO(out, rc = -ENOMEM);
1218 rc = ptlrpc_request_pack(req, LUSTRE_OBD_VERSION, LFSCK_NOTIFY);
1220 ptlrpc_request_free(req);
1225 lr = req_capsule_client_get(&req->rq_pill, &RMF_LFSCK_REQUEST);
1226 memset(lr, 0, sizeof(*lr));
1227 lr->lr_event = event;
1228 lr->lr_index = lfsck_dev_idx(lfsck);
1229 lr->lr_active = LFSCK_TYPE_NAMESPACE;
1231 lr->lr_flags = flags;
1233 ptlrpc_request_set_replen(req);
1234 rc = ptlrpc_queue_wait(req);
1235 ptlrpc_req_finished(req);
1237 GOTO(out, rc = (rc == -ENOENT ? 1 : rc));
1240 CDEBUG(D_LFSCK, "%s: namespace LFSCK notify LMV EA updated for the "
1241 "object "DFID" on MDT %x remotely with event %u, flags %u: "
1242 "rc = %d\n", lfsck_lfsck2name(lfsck), PFID(fid), index,
1252 * Generate request for local LFSCK instance to rescan the striped directory.
1254 * \param[in] env pointer to the thread context
1255 * \param[in] com pointer to the lfsck component
1256 * \param[in] obj pointer to the striped directory to be rescanned
1258 * \retval positive number if nothing to be done
1259 * \retval zero for success
1260 * \retval negative error number on failure
1262 int lfsck_namespace_notify_lmv_master_local(const struct lu_env *env,
1263 struct lfsck_component *com,
1264 struct dt_object *obj)
1266 struct lfsck_instance *lfsck = com->lc_lfsck;
1267 struct lfsck_namespace *ns = com->lc_file_ram;
1268 struct lmv_mds_md_v1 *lmv4 = &lfsck_env_info(env)->lti_lmv4;
1269 struct lfsck_lmv_unit *llu;
1270 struct lfsck_lmv *llmv;
1271 struct lfsck_slave_lmv_rec *lslr;
1276 if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1279 rc = lfsck_read_stripe_lmv(env, obj, lmv4);
1284 if (unlikely(llu == NULL))
1287 if (lmv4->lmv_stripe_count < 1)
1288 count = LFSCK_LMV_DEF_STRIPES;
1289 else if (lmv4->lmv_stripe_count > LFSCK_LMV_MAX_STRIPES)
1290 count = LFSCK_LMV_MAX_STRIPES;
1292 count = lmv4->lmv_stripe_count;
1294 OBD_ALLOC_LARGE(lslr, sizeof(struct lfsck_slave_lmv_rec) * count);
1301 INIT_LIST_HEAD(&llu->llu_link);
1302 llu->llu_lfsck = lfsck;
1303 llu->llu_obj = lfsck_object_get(obj);
1304 llmv = &llu->llu_lmv;
1305 llmv->ll_lmv_master = 1;
1306 llmv->ll_inline = 1;
1307 atomic_set(&llmv->ll_ref, 1);
1308 llmv->ll_stripes_allocated = count;
1309 llmv->ll_hash_type = LMV_HASH_TYPE_UNKNOWN;
1310 llmv->ll_lslr = lslr;
1311 llmv->ll_lmv = *lmv4;
1313 down_write(&com->lc_sem);
1314 if (ns->ln_status != LS_SCANNING_PHASE1 &&
1315 ns->ln_status != LS_SCANNING_PHASE2) {
1316 ns->ln_striped_dirs_skipped++;
1317 up_write(&com->lc_sem);
1318 lfsck_lmv_put(env, llmv);
1320 ns->ln_striped_dirs_repaired++;
1321 spin_lock(&lfsck->li_lock);
1322 list_add_tail(&llu->llu_link, &lfsck->li_list_lmv);
1323 spin_unlock(&lfsck->li_lock);
1324 up_write(&com->lc_sem);
1331 * Set master LMV EA for the specified striped directory.
1333 * First, if the master MDT-object of a striped directory lost its LMV EA,
1334 * then there may be some users have created some files under the master
1335 * MDT-object directly. Under such case, the LFSCK cannot re-generate LMV
1336 * EA for the master MDT-object, because we should keep the existing files
1337 * to be visible to client. Then the LFSCK will mark the striped directory
1338 * as read-only and keep it there to be handled by administrator manually.
1340 * If nobody has created files under the master MDT-object of the striped
1341 * directory, then we will set the master LMV EA and generate a new rescan
1342 * (the striped directory) request that will be handled later by the LFSCK
1343 * instance on the MDT later.
1345 * \param[in] env pointer to the thread context
1346 * \param[in] com pointer to the lfsck component
1347 * \param[in] obj pointer to the object on which the LMV EA will be set
1348 * \param[in] lmv pointer to the buffer holding the new LMV EA
1349 * \param[in] cfid the shard's FID used for verification
1350 * \param[in] cidx the shard's index used for verification
1351 * \param[in] flags to indicate which element(s) in the LMV EA will be set
1353 * \retval positive number if nothing to be done
1354 * \retval zero for success
1355 * \retval negative error number on failure
1357 static int lfsck_namespace_set_lmv_master(const struct lu_env *env,
1358 struct lfsck_component *com,
1359 struct dt_object *obj,
1360 struct lmv_mds_md_v1 *lmv,
1361 const struct lu_fid *cfid,
1362 __u32 cidx, __u32 flags)
1364 struct lfsck_thread_info *info = lfsck_env_info(env);
1365 struct lmv_mds_md_v1 *lmv3 = &info->lti_lmv3;
1366 struct lu_seq_range *range = &info->lti_range;
1367 struct lfsck_instance *lfsck = com->lc_lfsck;
1368 struct seq_server_site *ss = lfsck_dev_site(lfsck);
1369 struct lustre_handle lh = { 0 };
1374 fld_range_set_mdt(range);
1375 rc = fld_server_lookup(env, ss->ss_server_fld,
1376 fid_seq(lfsck_dto2fid(obj)), range);
1380 pidx = range->lsr_index;
1381 rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
1382 MDS_INODELOCK_UPDATE | MDS_INODELOCK_XATTR,
1387 rc = lfsck_read_stripe_lmv(env, obj, lmv3);
1388 if (rc == -ENODATA) {
1389 if (!(flags & LEF_SET_LMV_ALL))
1393 } else if (rc == 0) {
1394 if (flags & LEF_SET_LMV_ALL)
1397 if (flags & LEF_SET_LMV_HASH)
1398 lmv3->lmv_hash_type = lmv->lmv_hash_type;
1403 lmv3->lmv_magic = LMV_MAGIC;
1404 lmv3->lmv_master_mdt_index = pidx;
1406 if (flags & LEF_SET_LMV_ALL) {
1407 rc = lfsck_allow_regenerate_master_lmv(env, com, obj,
1410 rc = lfsck_disable_master_lmv(env, com, obj, false);
1412 GOTO(log, rc = (rc == 0 ? 1 : rc));
1418 /* To indicate that the master has ever lost LMV EA. */
1419 lmv3->lmv_hash_type |= LMV_HASH_FLAG_LOST_LMV;
1422 rc = lfsck_namespace_update_lmv(env, com, obj, lmv3, true);
1423 if (rc == 0 && flags & LEF_SET_LMV_ALL) {
1424 if (dt_object_remote(obj))
1425 rc = lfsck_namespace_notify_lmv_remote(env, com, obj,
1426 LE_SET_LMV_MASTER, 0, pidx);
1428 rc = lfsck_namespace_notify_lmv_master_local(env, com,
1435 lfsck_ibits_unlock(&lh, LCK_EX);
1436 CDEBUG(D_LFSCK, "%s: namespace LFSCK set master LMV EA for the object "
1437 DFID" on the %s MDT %d, flags %x: rc = %d\n",
1438 lfsck_lfsck2name(lfsck), PFID(lfsck_dto2fid(obj)),
1439 dt_object_remote(obj) ? "remote" : "local", pidx, flags, rc);
1442 struct lfsck_namespace *ns = com->lc_file_ram;
1444 ns->ln_flags |= LF_INCONSISTENT;
1451 * Repair the bad name hash.
1453 * If the name hash of some name entry under the striped directory does not
1454 * match the shard of the striped directory, then the LFSCK will repair the
1455 * inconsistency. Ideally, the LFSCK should migrate the name entry from the
1456 * current MDT to the right MDT (another one), but before the async commit
1457 * finished, the LFSCK will change the striped directory's hash type as
1458 * LMV_HASH_TYPE_UNKNOWN and mark the lmv flags as LMV_HASH_FLAG_BAD_TYPE.
1460 * \param[in] env pointer to the thread context
1461 * \param[in] com pointer to the lfsck component
1462 * \param[in] shard pointer to the shard of the striped directory that
1463 * contains the bad name entry
1464 * \param[in] llmv pointer to lfsck LMV EA structure
1465 * \param[in] name the name of the bad name hash
1467 * \retval positive number if nothing to be done
1468 * \retval zero for success
1469 * \retval negative error number on failure
1471 int lfsck_namespace_repair_bad_name_hash(const struct lu_env *env,
1472 struct lfsck_component *com,
1473 struct dt_object *shard,
1474 struct lfsck_lmv *llmv,
1477 struct lfsck_thread_info *info = lfsck_env_info(env);
1478 struct lu_fid *pfid = &info->lti_fid3;
1479 struct lmv_mds_md_v1 *lmv2 = &info->lti_lmv2;
1480 struct lfsck_instance *lfsck = com->lc_lfsck;
1481 struct dt_object *parent = NULL;
1485 rc = dt_lookup(env, shard, (struct dt_rec *)pfid,
1486 (const struct dt_key *)dotdot);
1487 if (rc != 0 || !fid_is_sane(pfid))
1490 parent = lfsck_object_find_bottom(env, lfsck, pfid);
1492 GOTO(log, rc = PTR_ERR(parent));
1494 if (unlikely(!dt_object_exists(parent)))
1495 /* The parent object was previously accessed when verifying
1496 * the slave LMV EA. If this condition is true it is because
1497 * the striped directory is being removed. */
1500 *lmv2 = llmv->ll_lmv;
1501 lmv2->lmv_hash_type = LMV_HASH_TYPE_UNKNOWN | LMV_HASH_FLAG_BAD_TYPE;
1502 rc = lfsck_namespace_set_lmv_master(env, com, parent, lmv2,
1503 lfsck_dto2fid(shard),
1504 llmv->ll_lmv.lmv_master_mdt_index,
1510 CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant found bad name hash "
1511 "on the MDT %x, parent "DFID", name %s, shard_%x "DFID
1513 lfsck_lfsck2name(lfsck), lfsck_dev_idx(lfsck),
1514 PFID(pfid), name, llmv->ll_lmv.lmv_master_mdt_index,
1515 PFID(lfsck_dto2fid(shard)), rc);
1517 if (parent != NULL && !IS_ERR(parent))
1518 lfsck_object_put(env, parent);
1524 * Scan the shard of a striped directory for name hash verification.
1526 * During the first-stage scanning, if the LFSCK cannot make sure whether
1527 * the shard of a stripe directory contains valid slave LMV EA or not, then
1528 * it will skip the name hash verification for this shard temporarily, and
1529 * record the shard's FID in the LFSCK tracing file. As the LFSCK processing,
1530 * the slave LMV EA may has been verified/fixed by LFSCK instance on master.
1531 * Then in the second-stage scanning, the shard will be re-scanned, and for
1532 * every name entry under the shard, the name hash will be verified, and for
1533 * unmatched name entry, the LFSCK will try to fix it.
1535 * \param[in] env pointer to the thread context
1536 * \param[in] com pointer to the lfsck component
1537 * \param[in] child pointer to the directory object to be handled
1539 * \retval positive number for scanning successfully
1540 * \retval zero for the scanning is paused
1541 * \retval negative error number on failure
1543 int lfsck_namespace_scan_shard(const struct lu_env *env,
1544 struct lfsck_component *com,
1545 struct dt_object *child)
1547 struct lfsck_thread_info *info = lfsck_env_info(env);
1548 struct lmv_mds_md_v1 *lmv = &info->lti_lmv;
1549 struct lfsck_instance *lfsck = com->lc_lfsck;
1550 struct lfsck_namespace *ns = com->lc_file_ram;
1551 struct ptlrpc_thread *thread = &lfsck->li_thread;
1552 struct lu_dirent *ent =
1553 (struct lu_dirent *)info->lti_key;
1554 struct lfsck_bookmark *bk = &lfsck->li_bookmark_ram;
1555 struct lfsck_lmv *llmv = NULL;
1556 const struct dt_it_ops *iops;
1564 rc = lfsck_read_stripe_lmv(env, child, lmv);
1566 RETURN(rc == -ENODATA ? 1 : rc);
1568 if (lmv->lmv_magic != LMV_MAGIC_STRIPE)
1571 if (unlikely(!dt_try_as_dir(env, child)))
1574 OBD_ALLOC_PTR(llmv);
1578 llmv->ll_lmv_slave = 1;
1579 llmv->ll_lmv_verified = 1;
1580 llmv->ll_lmv = *lmv;
1581 atomic_set(&llmv->ll_ref, 1);
1583 args = lfsck->li_args_dir & ~(LUDA_VERIFY | LUDA_VERIFY_DRYRUN);
1584 iops = &child->do_index_ops->dio_it;
1585 di = iops->init(env, child, args);
1587 GOTO(out, rc = PTR_ERR(di));
1589 rc = iops->load(env, di, 0);
1591 rc = iops->next(env, di);
1596 if (CFS_FAIL_TIMEOUT(OBD_FAIL_LFSCK_DELAY3, cfs_fail_val) &&
1597 unlikely(!thread_is_running(thread)))
1600 rc = iops->rec(env, di, (struct dt_rec *)ent, args);
1602 rc = lfsck_unpack_ent(ent, &cookie, &type);
1605 if (bk->lb_param & LPF_FAILOUT)
1611 /* skip dot and dotdot entries */
1612 if (name_is_dot_or_dotdot(ent->lde_name, ent->lde_namelen))
1615 if (!lfsck_is_valid_slave_name_entry(env, llmv, ent->lde_name,
1616 ent->lde_namelen)) {
1617 ns->ln_flags |= LF_INCONSISTENT;
1618 rc = lfsck_namespace_repair_bad_name_hash(env, com,
1619 child, llmv, ent->lde_name);
1621 ns->ln_name_hash_repaired++;
1624 if (rc < 0 && bk->lb_param & LPF_FAILOUT)
1628 lfsck_control_speed(lfsck);
1629 if (unlikely(!thread_is_running(thread)))
1632 if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_FATAL2)) {
1633 spin_lock(&lfsck->li_lock);
1634 thread_set_flags(thread, SVC_STOPPING);
1635 spin_unlock(&lfsck->li_lock);
1637 GOTO(out, rc = -EINVAL);
1641 rc = iops->next(env, di);
1648 iops->fini(env, di);
1649 lfsck_lmv_put(env, llmv);
1655 * Verify the slave object's (of striped directory) LMV EA.
1657 * For the slave object of a striped directory, before traversing the shard
1658 * the LFSCK will verify whether its slave LMV EA matches its parent's master
1661 * \param[in] env pointer to the thread context
1662 * \param[in] com pointer to the lfsck component
1663 * \param[in] obj pointer to the object which LMV EA will be checked
1664 * \param[in] llmv pointer to buffer holding the slave LMV EA
1666 * \retval positive number if nothing to be done
1667 * \retval zero for success
1668 * \retval negative error number on failure
1670 int lfsck_namespace_verify_stripe_slave(const struct lu_env *env,
1671 struct lfsck_component *com,
1672 struct dt_object *obj,
1673 struct lfsck_lmv *llmv)
1675 struct lfsck_thread_info *info = lfsck_env_info(env);
1676 char *name = info->lti_key;
1678 struct lu_fid *pfid = &info->lti_fid3;
1679 const struct lu_fid *cfid = lfsck_dto2fid(obj);
1681 struct lfsck_instance *lfsck = com->lc_lfsck;
1682 struct lmv_mds_md_v1 *clmv = &llmv->ll_lmv;
1683 struct lmv_mds_md_v1 *plmv = &info->lti_lmv;
1684 struct dt_object *parent = NULL;
1688 if (!lfsck_is_valid_slave_lmv(clmv)) {
1689 rc = lfsck_namespace_trace_update(env, com, cfid,
1690 LNTF_UNCERTAIN_LMV, true);
1695 rc = dt_lookup(env, obj, (struct dt_rec *)pfid,
1696 (const struct dt_key *)dotdot);
1697 if (rc != 0 || !fid_is_sane(pfid)) {
1698 rc = lfsck_namespace_trace_update(env, com, cfid,
1699 LNTF_UNCERTAIN_LMV, true);
1704 parent = lfsck_object_find_bottom(env, lfsck, pfid);
1705 if (IS_ERR(parent)) {
1706 rc = lfsck_namespace_trace_update(env, com, cfid,
1707 LNTF_UNCERTAIN_LMV, true);
1712 if (unlikely(!dt_object_exists(parent)))
1715 if (unlikely(!dt_try_as_dir(env, parent)))
1716 GOTO(out, rc = -ENOTDIR);
1718 rc = lfsck_read_stripe_lmv(env, parent, plmv);
1722 /* If the parent has no LMV EA, then it maybe because:
1723 * 1) The parent lost the LMV EA.
1724 * 2) The child claims a wrong (slave) LMV EA. */
1726 rc = lfsck_namespace_set_lmv_master(env, com, parent,
1727 clmv, cfid, clmv->lmv_master_mdt_index,
1732 rc1 = lfsck_namespace_trace_update(env, com, cfid,
1733 LNTF_UNCERTAIN_LMV, true);
1735 GOTO(out, rc = (rc < 0 ? rc : rc1));
1738 /* Unmatched magic or stripe count. */
1739 if (unlikely(plmv->lmv_magic != LMV_MAGIC ||
1740 plmv->lmv_stripe_count != clmv->lmv_stripe_count)) {
1741 rc = lfsck_namespace_trace_update(env, com, cfid,
1742 LNTF_UNCERTAIN_LMV, true);
1747 /* If the master hash type has been set as LMV_HASH_TYPE_UNKNOWN,
1748 * then the slave hash type is not important. */
1749 if ((plmv->lmv_hash_type & LMV_HASH_TYPE_MASK) ==
1750 LMV_HASH_TYPE_UNKNOWN &&
1751 plmv->lmv_hash_type & LMV_HASH_FLAG_BAD_TYPE)
1754 /* Unmatched hash type. */
1755 if (unlikely((plmv->lmv_hash_type & LMV_HASH_TYPE_MASK) !=
1756 (clmv->lmv_hash_type & LMV_HASH_TYPE_MASK))) {
1757 rc = lfsck_namespace_trace_update(env, com, cfid,
1758 LNTF_UNCERTAIN_LMV, true);
1763 snprintf(info->lti_tmpbuf2, sizeof(info->lti_tmpbuf2), DFID":%u",
1764 PFID(cfid), clmv->lmv_master_mdt_index);
1765 name2 = info->lti_tmpbuf2;
1767 rc = lfsck_links_get_first(env, obj, name, &tfid);
1768 if (rc == 0 && strcmp(name, name2) == 0 && lu_fid_eq(pfid, &tfid)) {
1769 llmv->ll_lmv_verified = 1;
1774 rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
1775 (const struct dt_key *)name2);
1776 if (rc != 0 || !lu_fid_eq(cfid, &tfid))
1777 rc = lfsck_namespace_trace_update(env, com, cfid,
1778 LNTF_UNCERTAIN_LMV, true);
1780 llmv->ll_lmv_verified = 1;
1785 if (parent != NULL && !IS_ERR(parent))
1786 lfsck_object_put(env, parent);
1792 * Double scan the striped directory or the shard.
1794 * All the shards' under the given striped directory or its shard have
1795 * been scanned, the LFSCK has got the global knownledge about the LMV
1798 * If the target is one shard of a striped directory, then only needs to
1799 * update related tracing file.
1801 * If the target is the master MDT-object of a striped directory, then the
1802 * LFSCK will make the decision about whether the master LMV EA is invalid
1803 * or not, and repair it if inconsistenct; for every shard of the striped
1804 * directory, whether the slave LMV EA is invalid or not, and repair it if
1807 * \param[in] env pointer to the thread context
1808 * \param[in] com pointer to the lfsck component
1809 * \param[in] lnr pointer to the namespace request that contains the
1810 * striped directory or the shard
1812 * \retval zero for success
1813 * \retval negative error number on failure
1815 int lfsck_namespace_striped_dir_rescan(const struct lu_env *env,
1816 struct lfsck_component *com,
1817 struct lfsck_namespace_req *lnr)
1819 struct lfsck_thread_info *info = lfsck_env_info(env);
1820 struct lfsck_instance *lfsck = com->lc_lfsck;
1821 struct lfsck_namespace *ns = com->lc_file_ram;
1822 struct lfsck_lmv *llmv = lnr->lnr_lmv;
1823 struct lmv_mds_md_v1 *lmv = &llmv->ll_lmv;
1824 struct lmv_mds_md_v1 *lmv2 = &info->lti_lmv2;
1825 struct lfsck_assistant_object *lso = lnr->lnr_lar.lar_parent;
1826 const struct lu_fid *pfid = &lso->lso_fid;
1827 struct dt_object *dir = NULL;
1828 struct dt_object *obj = NULL;
1829 struct lu_seq_range *range = &info->lti_range;
1830 struct seq_server_site *ss = lfsck_dev_site(lfsck);
1837 if (llmv->ll_lmv_slave) {
1838 if (llmv->ll_lmv_verified) {
1839 ns->ln_striped_shards_scanned++;
1840 lfsck_namespace_trace_update(env, com, pfid,
1841 LNTF_UNCERTAIN_LMV |
1842 LNTF_RECHECK_NAME_HASH, false);
1848 /* Either the striped directory has been disabled or only part of
1849 * the striped directory have been scanned. The LFSCK cannot repair
1850 * something based on incompleted knowledge. So skip it. */
1851 if (llmv->ll_ignore || llmv->ll_exit_value <= 0)
1854 /* There ever been some failure, as to the LFSCK cannot know whether
1855 * it has got the global knowledge about the LMV EA consistency or not,
1856 * so it cannot make reparation about the incompleted knowledge. */
1857 if (llmv->ll_failed) {
1858 ns->ln_striped_dirs_scanned++;
1859 ns->ln_striped_dirs_failed++;
1864 if (lmv->lmv_stripe_count > LFSCK_LMV_MAX_STRIPES)
1865 stripe_count = max(llmv->ll_max_filled_off + 1,
1866 llmv->ll_max_stripe_count);
1868 stripe_count = max(llmv->ll_max_filled_off + 1,
1869 lmv->lmv_stripe_count);
1871 if (lmv->lmv_stripe_count != stripe_count) {
1872 lmv->lmv_stripe_count = stripe_count;
1873 llmv->ll_lmv_updated = 1;
1876 if (!lmv_is_known_hash_type(lmv->lmv_hash_type) &&
1877 !(lmv->lmv_hash_type & LMV_HASH_FLAG_BAD_TYPE) &&
1878 lmv_is_known_hash_type(llmv->ll_hash_type)) {
1879 hash_type = llmv->ll_hash_type & LMV_HASH_TYPE_MASK;
1880 lmv->lmv_hash_type = llmv->ll_hash_type;
1881 llmv->ll_lmv_updated = 1;
1883 hash_type = lmv->lmv_hash_type & LMV_HASH_TYPE_MASK;
1884 if (!lmv_is_known_hash_type(hash_type))
1885 hash_type = LMV_HASH_TYPE_UNKNOWN;
1888 if (llmv->ll_lmv_updated) {
1890 dir = lfsck_assistant_object_load(env, lfsck, lso);
1894 RETURN(rc == -ENOENT ? 0 : rc);
1898 lmv->lmv_layout_version++;
1899 rc = lfsck_namespace_update_lmv(env, com, dir, lmv, false);
1903 ns->ln_striped_dirs_scanned++;
1904 ns->ln_striped_dirs_repaired++;
1907 fld_range_set_mdt(range);
1908 for (i = 0; i <= llmv->ll_max_filled_off; i++) {
1909 struct lfsck_slave_lmv_rec *lslr = llmv->ll_lslr + i;
1910 const struct lu_fid *cfid = &lslr->lslr_fid;
1911 const struct lu_name *cname;
1912 struct linkea_data ldata = { NULL };
1915 bool repair_linkea = false;
1916 bool repair_lmvea = false;
1917 bool rename = false;
1918 bool create = false;
1919 bool linkea_repaired = false;
1920 bool lmvea_repaired = false;
1921 bool rename_repaired = false;
1922 bool create_repaired = false;
1925 if (fid_is_zero(cfid))
1928 len = snprintf(info->lti_tmpbuf, sizeof(info->lti_tmpbuf),
1929 DFID":%u", PFID(cfid), i);
1930 cname = lfsck_name_get_const(env, info->lti_tmpbuf, len);
1931 memcpy(lnr->lnr_name, info->lti_tmpbuf, len);
1933 obj = lfsck_object_find_bottom(env, lfsck, cfid);
1936 dir = lfsck_assistant_object_load(env, lfsck,
1939 if (PTR_ERR(dir) == -ENOENT)
1944 } else if (lfsck_is_dead_obj(dir)) {
1952 switch (lslr->lslr_flags) {
1954 if (llmv->ll_inline ||
1955 lslr->lslr_stripe_count != stripe_count ||
1956 (lslr->lslr_hash_type & LMV_HASH_TYPE_MASK) !=
1958 repair_lmvea = true;
1960 case LSLF_BAD_INDEX2:
1961 /* The index in the slave LMV EA is right,
1962 * the name entry should be updated. */
1964 snprintf(info->lti_tmpbuf2, sizeof(info->lti_tmpbuf2),
1965 DFID":%u", PFID(cfid), lslr->lslr_index);
1966 if (llmv->ll_inline ||
1967 lslr->lslr_stripe_count != stripe_count ||
1968 (lslr->lslr_hash_type & LMV_HASH_TYPE_MASK) !=
1970 repair_lmvea = true;
1972 case LSLF_BAD_INDEX1:
1973 /* The index in the name entry is right,
1974 * the slave LMV EA should be updated. */
1976 repair_lmvea = true;
1985 rc1 = lfsck_links_read_with_rec(env, obj, &ldata);
1986 if (rc1 == -ENOENT) {
1991 if (rc1 == -EINVAL || rc1 == -ENODATA) {
1992 repair_linkea = true;
1999 if (ldata.ld_leh->leh_reccount != 1) {
2000 repair_linkea = true;
2004 rc1 = linkea_links_find(&ldata, cname, pfid);
2006 repair_linkea = true;
2011 dir = lfsck_assistant_object_load(env, lfsck,
2024 rc1 = lfsck_namespace_repair_dangling(env, com, dir,
2027 create_repaired = true;
2029 ns->ln_dangling_repaired++;
2035 lmv2->lmv_magic = LMV_MAGIC_STRIPE;
2036 lmv2->lmv_stripe_count = stripe_count;
2037 lmv2->lmv_master_mdt_index = i;
2038 lmv2->lmv_hash_type = hash_type;
2040 rc1 = lfsck_namespace_update_lmv(env, com, obj,
2045 if (dt_object_remote(obj)) {
2046 rc1 = fld_server_lookup(env, ss->ss_server_fld,
2047 fid_seq(lfsck_dto2fid(obj)), range);
2051 rc1 = lfsck_namespace_notify_lmv_remote(env,
2052 com, obj, LE_SET_LMV_SLAVE, 0,
2055 ns->ln_striped_shards_repaired++;
2056 rc1 = lfsck_namespace_trace_update(env, com,
2057 cfid, LNTF_RECHECK_NAME_HASH, true);
2064 lmvea_repaired = true;
2065 } else if (llmv->ll_inline) {
2066 if (dt_object_remote(obj)) {
2067 rc1 = fld_server_lookup(env, ss->ss_server_fld,
2068 fid_seq(lfsck_dto2fid(obj)), range);
2072 /* The slave LMV EA on the remote shard is
2073 * correct, just notify the LFSCK instance
2074 * on such MDT to re-verify the name_hash. */
2075 rc1 = lfsck_namespace_notify_lmv_remote(env,
2076 com, obj, LE_SET_LMV_SLAVE,
2077 LEF_RECHECK_NAME_HASH,
2080 rc1 = lfsck_namespace_trace_update(env, com,
2081 cfid, LNTF_RECHECK_NAME_HASH, true);
2090 dir = lfsck_assistant_object_load(env, lfsck,
2103 rc1 = lfsck_namespace_repair_dirent(env, com, dir, obj,
2104 info->lti_tmpbuf2, lnr->lnr_name,
2105 lnr->lnr_type, true, false);
2107 rename_repaired = true;
2109 ns->ln_dirent_repaired++;
2110 rc1 = lfsck_namespace_trace_update(env,
2112 LNTF_RECHECK_NAME_HASH, true);
2120 if (repair_linkea) {
2121 struct lustre_handle lh = { 0 };
2123 rc1 = linkea_links_new(&ldata, &info->lti_big_buf,
2124 cname, lfsck_dto2fid(dir));
2129 dir = lfsck_assistant_object_load(env, lfsck,
2142 rc1 = lfsck_ibits_lock(env, lfsck, obj, &lh,
2143 MDS_INODELOCK_UPDATE |
2144 MDS_INODELOCK_XATTR, LCK_EX);
2148 rc1 = lfsck_namespace_rebuild_linkea(env, com, obj,
2150 lfsck_ibits_unlock(&lh, LCK_EX);
2152 linkea_repaired = true;
2154 ns->ln_linkea_repaired++;
2159 CDEBUG(D_LFSCK, "%s: namespace LFSCK repair the shard "
2160 "%d "DFID" of the striped directory "DFID" with "
2161 "dangling %s/%s, rename %s/%s, llinkea %s/%s, "
2162 "repair_lmvea %s/%s: rc = %d\n", lfsck_lfsck2name(lfsck),
2163 i, PFID(cfid), PFID(&lnr->lnr_fid),
2164 create ? "yes" : "no", create_repaired ? "yes" : "no",
2165 rename ? "yes" : "no", rename_repaired ? "yes" : "no",
2166 repair_linkea ? "yes" : "no",
2167 linkea_repaired ? "yes" : "no",
2168 repair_lmvea ? "yes" : "no",
2169 lmvea_repaired ? "yes" : "no", rc1);
2171 if (obj != NULL && !IS_ERR(obj)) {
2172 lfsck_object_put(env, obj);
2178 ns->ln_striped_shards_failed++;
2185 if (obj != NULL && !IS_ERR(obj))
2186 lfsck_object_put(env, obj);
2188 if (dir != NULL && !IS_ERR(dir))
2189 lfsck_object_put(env, dir);
2195 * Verify the shard's name entry under the striped directory.
2197 * Before all shards of the striped directory scanned, the LFSCK cannot
2198 * know whether the master LMV EA is valid or not, and also cannot know
2199 * how to repair an invalid shard exactly. For example, the stripe index
2200 * stored in the shard's name does not match the stripe index stored in
2201 * the slave LMV EA, then the LFSCK cannot know which one is correct.
2202 * If the LFSCK just assumed one is correct, and fixed the other, then
2203 * as the LFSCK processing, it may find that the former reparation is
2204 * wrong and have to roll back. Unfortunately, if some applications saw
2205 * the changes and made further modification based on such changes, then
2206 * the roll back is almost impossible.
2208 * To avoid above trouble, the LFSCK will scan the master object of the
2209 * striped directory twice, that is NOT the same as normal two-stages
2210 * scanning, the double scanning the striped directory will happen both
2211 * during the first-stage scanning:
2213 * 1) When the striped directory is opened for scanning, the LFSCK will
2214 * iterate each shard in turn, and records its slave LMV EA in the
2215 * lfsck_lmv::ll_lslr. In this step, if the 'shard' (may be fake
2216 * shard) name does not match the shard naming rule, for example, it
2217 * does not contains the shard's FID, or not contains index, then we
2218 * can remove the bad name entry directly. But if the name is valid,
2219 * but the shard has no slave LMV EA or the slave LMV EA does not
2220 * match its name, then we just record related information in the
2221 * lfsck_lmv::ll_lslr in RAM.
2223 * 2) When all the known shards have been scanned, then the engine will
2224 * generate a dummy request (via lfsck_namespace_close_dir) to tell
2225 * the assistant thread that all the known shards have been scanned.
2226 * Since the assistant has got the global knowledge about the index
2227 * conflict, stripe count, hash type, and so on. Then the assistant
2228 * thread will scan the lfsck_lmv::ll_lslr, and for every shard in
2229 * the record, check and repair inconsistency.
2231 * Generally, the stripe directory has only several shards, and there
2232 * will NOT be a lof of striped directory. So double scanning striped
2233 * directory will not much affect the LFSCK performance.
2235 * \param[in] env pointer to the thread context
2236 * \param[in] com pointer to the lfsck component
2237 * \param[in] lnr pointer to the namespace request that contains the
2238 * shard's name, parent object, parent's LMV, and ect.
2240 * \retval zero for success
2241 * \retval negative error number on failure
2243 int lfsck_namespace_handle_striped_master(const struct lu_env *env,
2244 struct lfsck_component *com,
2245 struct lfsck_namespace_req *lnr)
2247 struct lfsck_thread_info *info = lfsck_env_info(env);
2248 struct lmv_mds_md_v1 *lmv = &info->lti_lmv;
2249 struct lfsck_instance *lfsck = com->lc_lfsck;
2250 struct lfsck_namespace *ns = com->lc_file_ram;
2251 struct lfsck_lmv *llmv = lnr->lnr_lmv;
2252 struct lfsck_assistant_object *lso = lnr->lnr_lar.lar_parent;
2253 const struct lu_fid *pfid = &lso->lso_fid;
2254 struct dt_object *dir;
2255 struct dt_object *obj = NULL;
2256 struct dt_device *dev = NULL;
2261 bool repaired = false;
2262 enum lfsck_namespace_inconsistency_type type = LNIT_NONE;
2265 if (unlikely(llmv->ll_ignore))
2268 dir = lfsck_assistant_object_load(env, lfsck, lso);
2272 RETURN(rc == -ENOENT ? 0 : rc);
2275 shard_idx = lfsck_find_mdt_idx_by_fid(env, lfsck, &lnr->lnr_fid);
2277 GOTO(fail_lmv, rc = shard_idx);
2279 if (shard_idx == lfsck_dev_idx(lfsck)) {
2280 if (unlikely(strcmp(lnr->lnr_name, dotdot) == 0))
2283 dev = lfsck->li_bottom;
2285 struct lfsck_tgt_desc *ltd;
2287 /* Usually, some local filesystem consistency verification
2288 * tools can guarantee the local namespace tree consistenct.
2289 * So the LFSCK will only verify the remote directory. */
2290 if (unlikely(strcmp(lnr->lnr_name, dotdot) == 0)) {
2291 rc = lfsck_namespace_trace_update(env, com, pfid,
2292 LNTF_CHECK_PARENT, true);
2297 ltd = lfsck_ltd2tgt(&lfsck->li_mdt_descs, shard_idx);
2298 if (unlikely(ltd == NULL)) {
2299 CDEBUG(D_LFSCK, "%s: cannot talk with MDT %x which "
2300 "did not join the namespace LFSCK\n",
2301 lfsck_lfsck2name(lfsck), shard_idx);
2302 lfsck_lad_set_bitmap(env, com, shard_idx);
2304 GOTO(fail_lmv, rc = -ENODEV);
2310 obj = lfsck_object_find_by_dev(env, dev, &lnr->lnr_fid);
2312 if (lfsck_is_dead_obj(dir))
2315 GOTO(fail_lmv, rc = PTR_ERR(obj));
2318 if (!dt_object_exists(obj)) {
2319 stripe = lfsck_shard_name_to_index(env, lnr->lnr_name,
2320 lnr->lnr_namelen, lnr->lnr_type, &lnr->lnr_fid);
2322 type = LNIT_BAD_DIRENT;
2328 rc = lfsck_namespace_check_exist(env, dir, obj, lnr->lnr_name);
2330 memset(lmv, 0, sizeof(*lmv));
2331 lmv->lmv_magic = LMV_MAGIC;
2332 rc = lfsck_record_lmv(env, com, dir, lnr, lmv, stripe,
2333 LSLF_DANGLING, LSLF_NONE, &depth);
2339 stripe = lfsck_shard_name_to_index(env, lnr->lnr_name, lnr->lnr_namelen,
2340 lfsck_object_type(obj),
2343 type = LNIT_BAD_DIRENT;
2348 rc = lfsck_read_stripe_lmv(env, obj, lmv);
2349 if (unlikely(rc == -ENOENT))
2350 /* It may happen when the remote object has been removed,
2351 * but the local MDT does not aware of that. */
2355 rc = lfsck_record_lmv(env, com, dir, lnr, lmv, stripe,
2356 LSLF_NO_LMVEA, LSLF_NONE, &depth);
2358 rc = lfsck_record_lmv(env, com, dir, lnr, lmv, stripe,
2359 lmv->lmv_master_mdt_index != stripe ?
2360 LSLF_BAD_INDEX1 : LSLF_NONE, LSLF_NONE,
2366 llmv->ll_failed = 1;
2369 if (rc >= 0 && type == LNIT_NONE && !S_ISDIR(lnr->lnr_type))
2370 type = LNIT_BAD_TYPE;
2374 rc = lfsck_namespace_repair_dirent(env, com, dir, obj,
2375 lnr->lnr_name, lnr->lnr_name,
2376 lnr->lnr_type, true, false);
2380 case LNIT_BAD_DIRENT:
2381 rc = lfsck_namespace_repair_dirent(env, com, dir, obj,
2382 lnr->lnr_name, lnr->lnr_name,
2383 lnr->lnr_type, false, false);
2392 CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant fail to handle "
2393 "the shard: "DFID", parent "DFID", name %.*s: rc = %d\n",
2394 lfsck_lfsck2name(lfsck), PFID(&lnr->lnr_fid),
2395 PFID(pfid), lnr->lnr_namelen, lnr->lnr_name, rc);
2397 if ((rc == -ENOTCONN || rc == -ESHUTDOWN || rc == -EREMCHG ||
2398 rc == -ETIMEDOUT || rc == -EHOSTDOWN ||
2399 rc == -EHOSTUNREACH || rc == -EINPROGRESS) &&
2400 dev != NULL && dev != lfsck->li_bottom)
2401 lfsck_lad_set_bitmap(env, com, shard_idx);
2403 if (!(lfsck->li_bookmark_ram.lb_param & LPF_FAILOUT))
2407 ns->ln_items_repaired++;
2411 ns->ln_bad_type_repaired++;
2413 case LNIT_BAD_DIRENT:
2414 ns->ln_dirent_repaired++;
2424 if (obj != NULL && !IS_ERR(obj))
2425 lfsck_object_put(env, obj);
2427 lfsck_object_put(env, dir);