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[fs/lustre-release.git] / lustre / lfsck / lfsck_namespace.c
1 /*
2  * GPL HEADER START
3  *
4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5  *
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.
9
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.
15
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
19  *
20  * GPL HEADER END
21  */
22 /*
23  * Copyright (c) 2013, 2014, Intel Corporation.
24  */
25 /*
26  * lustre/lfsck/lfsck_namespace.c
27  *
28  * Author: Fan, Yong <fan.yong@intel.com>
29  */
30
31 #define DEBUG_SUBSYSTEM S_LFSCK
32
33 #include <lustre/lustre_idl.h>
34 #include <lu_object.h>
35 #include <dt_object.h>
36 #include <md_object.h>
37 #include <lustre_fid.h>
38 #include <lustre_lib.h>
39 #include <lustre_net.h>
40 #include <lustre/lustre_user.h>
41
42 #include "lfsck_internal.h"
43
44 #define LFSCK_NAMESPACE_MAGIC_V1        0xA0629D03
45 #define LFSCK_NAMESPACE_MAGIC_V2        0xA0621A0B
46
47 /* For Lustre-2.x (x <= 6), the namespace LFSCK used LFSCK_NAMESPACE_MAGIC_V1
48  * as the trace file magic. When downgrade to such old release, the old LFSCK
49  * will not recognize the new LFSCK_NAMESPACE_MAGIC_V2 in the new trace file,
50  * then it will reset the whole LFSCK, and will not cause start failure. The
51  * similar case will happen when upgrade from such old release. */
52 #define LFSCK_NAMESPACE_MAGIC           LFSCK_NAMESPACE_MAGIC_V2
53
54 enum lfsck_nameentry_check {
55         LFSCK_NAMEENTRY_DEAD            = 1, /* The object has been unlinked. */
56         LFSCK_NAMEENTRY_REMOVED         = 2, /* The entry has been removed. */
57         LFSCK_NAMEENTRY_RECREATED       = 3, /* The entry has been recreated. */
58 };
59
60 static struct lfsck_namespace_req *
61 lfsck_namespace_assistant_req_init(struct lfsck_instance *lfsck,
62                                    struct lu_dirent *ent, __u16 type)
63 {
64         struct lfsck_namespace_req *lnr;
65         int                         size;
66
67         size = sizeof(*lnr) + (ent->lde_namelen & ~3) + 4;
68         OBD_ALLOC(lnr, size);
69         if (lnr == NULL)
70                 return ERR_PTR(-ENOMEM);
71
72         INIT_LIST_HEAD(&lnr->lnr_lar.lar_list);
73         lnr->lnr_lar.lar_fid = *lfsck_dto2fid(lfsck->li_obj_dir);
74         lnr->lnr_lmv = lfsck_lmv_get(lfsck->li_lmv);
75         lnr->lnr_fid = ent->lde_fid;
76         lnr->lnr_oit_cookie = lfsck->li_pos_current.lp_oit_cookie;
77         lnr->lnr_dir_cookie = ent->lde_hash;
78         lnr->lnr_attr = ent->lde_attrs;
79         lnr->lnr_size = size;
80         lnr->lnr_type = type;
81         lnr->lnr_namelen = ent->lde_namelen;
82         memcpy(lnr->lnr_name, ent->lde_name, ent->lde_namelen);
83
84         return lnr;
85 }
86
87 static void lfsck_namespace_assistant_req_fini(const struct lu_env *env,
88                                                struct lfsck_assistant_req *lar)
89 {
90         struct lfsck_namespace_req *lnr =
91                         container_of0(lar, struct lfsck_namespace_req, lnr_lar);
92
93         if (lnr->lnr_lmv != NULL)
94                 lfsck_lmv_put(env, lnr->lnr_lmv);
95
96         OBD_FREE(lnr, lnr->lnr_size);
97 }
98
99 static void lfsck_namespace_le_to_cpu(struct lfsck_namespace *dst,
100                                       struct lfsck_namespace *src)
101 {
102         dst->ln_magic = le32_to_cpu(src->ln_magic);
103         dst->ln_status = le32_to_cpu(src->ln_status);
104         dst->ln_flags = le32_to_cpu(src->ln_flags);
105         dst->ln_success_count = le32_to_cpu(src->ln_success_count);
106         dst->ln_run_time_phase1 = le32_to_cpu(src->ln_run_time_phase1);
107         dst->ln_run_time_phase2 = le32_to_cpu(src->ln_run_time_phase2);
108         dst->ln_time_last_complete = le64_to_cpu(src->ln_time_last_complete);
109         dst->ln_time_latest_start = le64_to_cpu(src->ln_time_latest_start);
110         dst->ln_time_last_checkpoint =
111                                 le64_to_cpu(src->ln_time_last_checkpoint);
112         lfsck_position_le_to_cpu(&dst->ln_pos_latest_start,
113                                  &src->ln_pos_latest_start);
114         lfsck_position_le_to_cpu(&dst->ln_pos_last_checkpoint,
115                                  &src->ln_pos_last_checkpoint);
116         lfsck_position_le_to_cpu(&dst->ln_pos_first_inconsistent,
117                                  &src->ln_pos_first_inconsistent);
118         dst->ln_items_checked = le64_to_cpu(src->ln_items_checked);
119         dst->ln_items_repaired = le64_to_cpu(src->ln_items_repaired);
120         dst->ln_items_failed = le64_to_cpu(src->ln_items_failed);
121         dst->ln_dirs_checked = le64_to_cpu(src->ln_dirs_checked);
122         dst->ln_objs_checked_phase2 = le64_to_cpu(src->ln_objs_checked_phase2);
123         dst->ln_objs_repaired_phase2 =
124                                 le64_to_cpu(src->ln_objs_repaired_phase2);
125         dst->ln_objs_failed_phase2 = le64_to_cpu(src->ln_objs_failed_phase2);
126         dst->ln_objs_nlink_repaired = le64_to_cpu(src->ln_objs_nlink_repaired);
127         fid_le_to_cpu(&dst->ln_fid_latest_scanned_phase2,
128                       &src->ln_fid_latest_scanned_phase2);
129         dst->ln_dirent_repaired = le64_to_cpu(src->ln_dirent_repaired);
130         dst->ln_linkea_repaired = le64_to_cpu(src->ln_linkea_repaired);
131         dst->ln_mul_linked_checked = le64_to_cpu(src->ln_mul_linked_checked);
132         dst->ln_mul_linked_repaired = le64_to_cpu(src->ln_mul_linked_repaired);
133         dst->ln_unknown_inconsistency =
134                                 le64_to_cpu(src->ln_unknown_inconsistency);
135         dst->ln_unmatched_pairs_repaired =
136                                 le64_to_cpu(src->ln_unmatched_pairs_repaired);
137         dst->ln_dangling_repaired = le64_to_cpu(src->ln_dangling_repaired);
138         dst->ln_mul_ref_repaired = le64_to_cpu(src->ln_mul_ref_repaired);
139         dst->ln_bad_type_repaired = le64_to_cpu(src->ln_bad_type_repaired);
140         dst->ln_lost_dirent_repaired =
141                                 le64_to_cpu(src->ln_lost_dirent_repaired);
142         dst->ln_striped_dirs_scanned =
143                                 le64_to_cpu(src->ln_striped_dirs_scanned);
144         dst->ln_striped_dirs_repaired =
145                                 le64_to_cpu(src->ln_striped_dirs_repaired);
146         dst->ln_striped_dirs_failed =
147                                 le64_to_cpu(src->ln_striped_dirs_failed);
148         dst->ln_striped_dirs_disabled =
149                                 le64_to_cpu(src->ln_striped_dirs_disabled);
150         dst->ln_striped_dirs_skipped =
151                                 le64_to_cpu(src->ln_striped_dirs_skipped);
152         dst->ln_striped_shards_scanned =
153                                 le64_to_cpu(src->ln_striped_shards_scanned);
154         dst->ln_striped_shards_repaired =
155                                 le64_to_cpu(src->ln_striped_shards_repaired);
156         dst->ln_striped_shards_failed =
157                                 le64_to_cpu(src->ln_striped_shards_failed);
158         dst->ln_striped_shards_skipped =
159                                 le64_to_cpu(src->ln_striped_shards_skipped);
160         dst->ln_name_hash_repaired = le64_to_cpu(src->ln_name_hash_repaired);
161         dst->ln_local_lpf_scanned = le64_to_cpu(src->ln_local_lpf_scanned);
162         dst->ln_local_lpf_moved = le64_to_cpu(src->ln_local_lpf_moved);
163         dst->ln_local_lpf_skipped = le64_to_cpu(src->ln_local_lpf_skipped);
164         dst->ln_local_lpf_failed = le64_to_cpu(src->ln_local_lpf_failed);
165         dst->ln_bitmap_size = le32_to_cpu(src->ln_bitmap_size);
166 }
167
168 static void lfsck_namespace_cpu_to_le(struct lfsck_namespace *dst,
169                                       struct lfsck_namespace *src)
170 {
171         dst->ln_magic = cpu_to_le32(src->ln_magic);
172         dst->ln_status = cpu_to_le32(src->ln_status);
173         dst->ln_flags = cpu_to_le32(src->ln_flags);
174         dst->ln_success_count = cpu_to_le32(src->ln_success_count);
175         dst->ln_run_time_phase1 = cpu_to_le32(src->ln_run_time_phase1);
176         dst->ln_run_time_phase2 = cpu_to_le32(src->ln_run_time_phase2);
177         dst->ln_time_last_complete = cpu_to_le64(src->ln_time_last_complete);
178         dst->ln_time_latest_start = cpu_to_le64(src->ln_time_latest_start);
179         dst->ln_time_last_checkpoint =
180                                 cpu_to_le64(src->ln_time_last_checkpoint);
181         lfsck_position_cpu_to_le(&dst->ln_pos_latest_start,
182                                  &src->ln_pos_latest_start);
183         lfsck_position_cpu_to_le(&dst->ln_pos_last_checkpoint,
184                                  &src->ln_pos_last_checkpoint);
185         lfsck_position_cpu_to_le(&dst->ln_pos_first_inconsistent,
186                                  &src->ln_pos_first_inconsistent);
187         dst->ln_items_checked = cpu_to_le64(src->ln_items_checked);
188         dst->ln_items_repaired = cpu_to_le64(src->ln_items_repaired);
189         dst->ln_items_failed = cpu_to_le64(src->ln_items_failed);
190         dst->ln_dirs_checked = cpu_to_le64(src->ln_dirs_checked);
191         dst->ln_objs_checked_phase2 = cpu_to_le64(src->ln_objs_checked_phase2);
192         dst->ln_objs_repaired_phase2 =
193                                 cpu_to_le64(src->ln_objs_repaired_phase2);
194         dst->ln_objs_failed_phase2 = cpu_to_le64(src->ln_objs_failed_phase2);
195         dst->ln_objs_nlink_repaired = cpu_to_le64(src->ln_objs_nlink_repaired);
196         fid_cpu_to_le(&dst->ln_fid_latest_scanned_phase2,
197                       &src->ln_fid_latest_scanned_phase2);
198         dst->ln_dirent_repaired = cpu_to_le64(src->ln_dirent_repaired);
199         dst->ln_linkea_repaired = cpu_to_le64(src->ln_linkea_repaired);
200         dst->ln_mul_linked_checked = cpu_to_le64(src->ln_mul_linked_checked);
201         dst->ln_mul_linked_repaired = cpu_to_le64(src->ln_mul_linked_repaired);
202         dst->ln_unknown_inconsistency =
203                                 cpu_to_le64(src->ln_unknown_inconsistency);
204         dst->ln_unmatched_pairs_repaired =
205                                 cpu_to_le64(src->ln_unmatched_pairs_repaired);
206         dst->ln_dangling_repaired = cpu_to_le64(src->ln_dangling_repaired);
207         dst->ln_mul_ref_repaired = cpu_to_le64(src->ln_mul_ref_repaired);
208         dst->ln_bad_type_repaired = cpu_to_le64(src->ln_bad_type_repaired);
209         dst->ln_lost_dirent_repaired =
210                                 cpu_to_le64(src->ln_lost_dirent_repaired);
211         dst->ln_striped_dirs_scanned =
212                                 cpu_to_le64(src->ln_striped_dirs_scanned);
213         dst->ln_striped_dirs_repaired =
214                                 cpu_to_le64(src->ln_striped_dirs_repaired);
215         dst->ln_striped_dirs_failed =
216                                 cpu_to_le64(src->ln_striped_dirs_failed);
217         dst->ln_striped_dirs_disabled =
218                                 cpu_to_le64(src->ln_striped_dirs_disabled);
219         dst->ln_striped_dirs_skipped =
220                                 cpu_to_le64(src->ln_striped_dirs_skipped);
221         dst->ln_striped_shards_scanned =
222                                 cpu_to_le64(src->ln_striped_shards_scanned);
223         dst->ln_striped_shards_repaired =
224                                 cpu_to_le64(src->ln_striped_shards_repaired);
225         dst->ln_striped_shards_failed =
226                                 cpu_to_le64(src->ln_striped_shards_failed);
227         dst->ln_striped_shards_skipped =
228                                 cpu_to_le64(src->ln_striped_shards_skipped);
229         dst->ln_name_hash_repaired = cpu_to_le64(src->ln_name_hash_repaired);
230         dst->ln_local_lpf_scanned = cpu_to_le64(src->ln_local_lpf_scanned);
231         dst->ln_local_lpf_moved = cpu_to_le64(src->ln_local_lpf_moved);
232         dst->ln_local_lpf_skipped = cpu_to_le64(src->ln_local_lpf_skipped);
233         dst->ln_local_lpf_failed = cpu_to_le64(src->ln_local_lpf_failed);
234         dst->ln_bitmap_size = cpu_to_le32(src->ln_bitmap_size);
235 }
236
237 static void lfsck_namespace_record_failure(const struct lu_env *env,
238                                            struct lfsck_instance *lfsck,
239                                            struct lfsck_namespace *ns)
240 {
241         struct lfsck_position pos;
242
243         ns->ln_items_failed++;
244         lfsck_pos_fill(env, lfsck, &pos, false);
245         if (lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent) ||
246             lfsck_pos_is_eq(&pos, &ns->ln_pos_first_inconsistent) < 0) {
247                 ns->ln_pos_first_inconsistent = pos;
248
249                 CDEBUG(D_LFSCK, "%s: namespace LFSCK hit first non-repaired "
250                        "inconsistency at the pos ["LPU64", "DFID", "LPX64"]\n",
251                        lfsck_lfsck2name(lfsck),
252                        ns->ln_pos_first_inconsistent.lp_oit_cookie,
253                        PFID(&ns->ln_pos_first_inconsistent.lp_dir_parent),
254                        ns->ln_pos_first_inconsistent.lp_dir_cookie);
255         }
256 }
257
258 /**
259  * Load the MDT bitmap from the lfsck_namespace trace file.
260  *
261  * \param[in] env       pointer to the thread context
262  * \param[in] com       pointer to the lfsck component
263  *
264  * \retval              0 for success
265  * \retval              negative error number on failure or data corruption
266  */
267 static int lfsck_namespace_load_bitmap(const struct lu_env *env,
268                                        struct lfsck_component *com)
269 {
270         struct dt_object                *obj    = com->lc_obj;
271         struct lfsck_assistant_data     *lad    = com->lc_data;
272         struct lfsck_namespace          *ns     = com->lc_file_ram;
273         cfs_bitmap_t                    *bitmap = lad->lad_bitmap;
274         ssize_t                          size;
275         __u32                            nbits;
276         int                              rc;
277         ENTRY;
278
279         if (com->lc_lfsck->li_mdt_descs.ltd_tgts_bitmap->size >
280             ns->ln_bitmap_size)
281                 nbits = com->lc_lfsck->li_mdt_descs.ltd_tgts_bitmap->size;
282         else
283                 nbits = ns->ln_bitmap_size;
284
285         if (unlikely(nbits < BITS_PER_LONG))
286                 nbits = BITS_PER_LONG;
287
288         if (nbits > bitmap->size) {
289                 __u32 new_bits = bitmap->size;
290                 cfs_bitmap_t *new_bitmap;
291
292                 while (new_bits < nbits)
293                         new_bits <<= 1;
294
295                 new_bitmap = CFS_ALLOCATE_BITMAP(new_bits);
296                 if (new_bitmap == NULL)
297                         RETURN(-ENOMEM);
298
299                 lad->lad_bitmap = new_bitmap;
300                 CFS_FREE_BITMAP(bitmap);
301                 bitmap = new_bitmap;
302         }
303
304         if (ns->ln_bitmap_size == 0) {
305                 lad->lad_incomplete = 0;
306                 CFS_RESET_BITMAP(bitmap);
307
308                 RETURN(0);
309         }
310
311         size = (ns->ln_bitmap_size + 7) >> 3;
312         rc = dt_xattr_get(env, obj,
313                           lfsck_buf_get(env, bitmap->data, size),
314                           XATTR_NAME_LFSCK_BITMAP, BYPASS_CAPA);
315         if (rc != size)
316                 RETURN(rc >= 0 ? -EINVAL : rc);
317
318         if (cfs_bitmap_check_empty(bitmap))
319                 lad->lad_incomplete = 0;
320         else
321                 lad->lad_incomplete = 1;
322
323         RETURN(0);
324 }
325
326 /**
327  * Load namespace LFSCK statistics information from the trace file.
328  *
329  * For old release (Lustre-2.6 or older), the statistics information was
330  * stored as XATTR_NAME_LFSCK_NAMESPACE_OLD EA. But in Lustre-2.7, we need
331  * more statistics information. To avoid confusing old MDT when downgrade,
332  * Lustre-2.7 stores the namespace LFSCK statistics information as new
333  * XATTR_NAME_LFSCK_NAMESPACE EA.
334  *
335  * \param[in] env       pointer to the thread context
336  * \param[in] com       pointer to the lfsck component
337  *
338  * \retval              0 for success
339  * \retval              negative error number on failure
340  */
341 static int lfsck_namespace_load(const struct lu_env *env,
342                                 struct lfsck_component *com)
343 {
344         int len = com->lc_file_size;
345         int rc;
346
347         rc = dt_xattr_get(env, com->lc_obj,
348                           lfsck_buf_get(env, com->lc_file_disk, len),
349                           XATTR_NAME_LFSCK_NAMESPACE, BYPASS_CAPA);
350         if (rc == len) {
351                 struct lfsck_namespace *ns = com->lc_file_ram;
352
353                 lfsck_namespace_le_to_cpu(ns,
354                                 (struct lfsck_namespace *)com->lc_file_disk);
355                 if (ns->ln_magic != LFSCK_NAMESPACE_MAGIC) {
356                         CDEBUG(D_LFSCK, "%s: invalid lfsck_namespace magic "
357                                "%#x != %#x\n", lfsck_lfsck2name(com->lc_lfsck),
358                                ns->ln_magic, LFSCK_NAMESPACE_MAGIC);
359                         rc = -ESTALE;
360                 } else {
361                         rc = 0;
362                 }
363         } else if (rc != -ENODATA) {
364                 CDEBUG(D_LFSCK, "%s: fail to load lfsck_namespace, "
365                        "expected = %d: rc = %d\n",
366                        lfsck_lfsck2name(com->lc_lfsck), len, rc);
367                 if (rc >= 0)
368                         rc = -ESTALE;
369         } else {
370                 /* Check whether it is old trace file or not.
371                  * If yes, it should be reset via returning -ESTALE. */
372                 rc = dt_xattr_get(env, com->lc_obj,
373                                   lfsck_buf_get(env, com->lc_file_disk, len),
374                                   XATTR_NAME_LFSCK_NAMESPACE_OLD, BYPASS_CAPA);
375                 if (rc >= 0)
376                         rc = -ESTALE;
377         }
378
379         return rc;
380 }
381
382 static int lfsck_namespace_store(const struct lu_env *env,
383                                  struct lfsck_component *com, bool init)
384 {
385         struct dt_object                *obj    = com->lc_obj;
386         struct lfsck_instance           *lfsck  = com->lc_lfsck;
387         struct lfsck_namespace          *ns     = com->lc_file_ram;
388         struct lfsck_assistant_data     *lad    = com->lc_data;
389         struct dt_device                *dev    = lfsck_obj2dev(obj);
390         cfs_bitmap_t                    *bitmap = NULL;
391         struct thandle                  *handle;
392         __u32                            nbits  = 0;
393         int                              len    = com->lc_file_size;
394         int                              rc;
395 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2, 8, 53, 0)
396         struct lu_buf            tbuf   = { &len, sizeof(len) };
397 #endif
398         ENTRY;
399
400         if (lad != NULL) {
401                 bitmap = lad->lad_bitmap;
402                 nbits = bitmap->size;
403
404                 LASSERT(nbits > 0);
405                 LASSERTF((nbits & 7) == 0, "Invalid nbits %u\n", nbits);
406         }
407
408         ns->ln_bitmap_size = nbits;
409         lfsck_namespace_cpu_to_le((struct lfsck_namespace *)com->lc_file_disk,
410                                   ns);
411         handle = dt_trans_create(env, dev);
412         if (IS_ERR(handle))
413                 GOTO(log, rc = PTR_ERR(handle));
414
415         rc = dt_declare_xattr_set(env, obj,
416                                   lfsck_buf_get(env, com->lc_file_disk, len),
417                                   XATTR_NAME_LFSCK_NAMESPACE, 0, handle);
418         if (rc != 0)
419                 GOTO(out, rc);
420
421         if (bitmap != NULL) {
422                 rc = dt_declare_xattr_set(env, obj,
423                                 lfsck_buf_get(env, bitmap->data, nbits >> 3),
424                                 XATTR_NAME_LFSCK_BITMAP, 0, handle);
425                 if (rc != 0)
426                         GOTO(out, rc);
427         }
428
429 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2, 8, 53, 0)
430         /* To be compatible with old Lustre-2.x MDT (x <= 6), generate dummy
431          * XATTR_NAME_LFSCK_NAMESPACE_OLD EA, then when downgrade to Lustre-2.x,
432          * the old LFSCK will find "invalid" XATTR_NAME_LFSCK_NAMESPACE_OLD EA,
433          * then reset the namespace LFSCK trace file. */
434         if (init) {
435                 rc = dt_declare_xattr_set(env, obj, &tbuf,
436                                           XATTR_NAME_LFSCK_NAMESPACE_OLD,
437                                           LU_XATTR_CREATE, handle);
438                 if (rc != 0)
439                         GOTO(out, rc);
440         }
441 #endif
442
443         rc = dt_trans_start_local(env, dev, handle);
444         if (rc != 0)
445                 GOTO(out, rc);
446
447         rc = dt_xattr_set(env, obj,
448                           lfsck_buf_get(env, com->lc_file_disk, len),
449                           XATTR_NAME_LFSCK_NAMESPACE, 0, handle, BYPASS_CAPA);
450         if (rc == 0 && bitmap != NULL)
451                 rc = dt_xattr_set(env, obj,
452                                   lfsck_buf_get(env, bitmap->data, nbits >> 3),
453                                   XATTR_NAME_LFSCK_BITMAP, 0, handle,
454                                   BYPASS_CAPA);
455
456 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2, 8, 53, 0)
457         if (rc == 0 && init)
458                 rc = dt_xattr_set(env, obj, &tbuf,
459                                   XATTR_NAME_LFSCK_NAMESPACE_OLD,
460                                   LU_XATTR_CREATE, handle, BYPASS_CAPA);
461 #endif
462
463         GOTO(out, rc);
464
465 out:
466         dt_trans_stop(env, dev, handle);
467
468 log:
469         if (rc != 0)
470                 CDEBUG(D_LFSCK, "%s: fail to store lfsck_namespace: rc = %d\n",
471                        lfsck_lfsck2name(lfsck), rc);
472         return rc;
473 }
474
475 static struct dt_object *
476 lfsck_namespace_load_one_trace_file(const struct lu_env *env,
477                                     struct lfsck_component *com,
478                                     struct dt_object *parent,
479                                     const char *name, bool reset)
480 {
481         struct lfsck_instance   *lfsck = com->lc_lfsck;
482         struct dt_object        *obj;
483         int                      rc;
484
485         if (reset) {
486                 rc = local_object_unlink(env, lfsck->li_bottom, parent, name);
487                 if (rc != 0 && rc != -ENOENT)
488                         return ERR_PTR(rc);
489         }
490
491         obj = local_index_find_or_create(env, lfsck->li_los, parent, name,
492                                          S_IFREG | S_IRUGO | S_IWUSR,
493                                          &dt_lfsck_features);
494
495         return obj;
496 }
497
498 static int lfsck_namespace_load_sub_trace_files(const struct lu_env *env,
499                                                 struct lfsck_component *com,
500                                                 bool reset)
501 {
502         char                            *name = lfsck_env_info(env)->lti_key;
503         struct lfsck_sub_trace_obj      *lsto;
504         struct dt_object                *obj;
505         int                              rc;
506         int                              i;
507
508         for (i = 0, lsto = &com->lc_sub_trace_objs[0];
509              i < LFSCK_STF_COUNT; i++, lsto++) {
510                 snprintf(name, NAME_MAX, "%s_%02d", LFSCK_NAMESPACE, i);
511                 if (lsto->lsto_obj != NULL) {
512                         if (!reset)
513                                 continue;
514
515                         lfsck_object_put(env, lsto->lsto_obj);
516                         lsto->lsto_obj = NULL;
517                 }
518
519                 obj = lfsck_namespace_load_one_trace_file(env, com,
520                                 com->lc_lfsck->li_lfsck_dir, name, reset);
521                 if (IS_ERR(obj))
522                         return PTR_ERR(obj);
523
524                 lsto->lsto_obj = obj;
525                 rc = obj->do_ops->do_index_try(env, obj, &dt_lfsck_features);
526                 if (rc != 0)
527                         return rc;
528         }
529
530         return 0;
531 }
532
533 static int lfsck_namespace_init(const struct lu_env *env,
534                                 struct lfsck_component *com)
535 {
536         struct lfsck_namespace *ns = com->lc_file_ram;
537         int rc;
538
539         memset(ns, 0, sizeof(*ns));
540         ns->ln_magic = LFSCK_NAMESPACE_MAGIC;
541         ns->ln_status = LS_INIT;
542         down_write(&com->lc_sem);
543         rc = lfsck_namespace_store(env, com, true);
544         up_write(&com->lc_sem);
545         if (rc == 0)
546                 rc = lfsck_namespace_load_sub_trace_files(env, com, true);
547
548         return rc;
549 }
550
551 /**
552  * Update the namespace LFSCK trace file for the given @fid
553  *
554  * \param[in] env       pointer to the thread context
555  * \param[in] com       pointer to the lfsck component
556  * \param[in] fid       the fid which flags to be updated in the lfsck
557  *                      trace file
558  * \param[in] add       true if add new flags, otherwise remove flags
559  *
560  * \retval              0 for succeed or nothing to be done
561  * \retval              negative error number on failure
562  */
563 int lfsck_namespace_trace_update(const struct lu_env *env,
564                                  struct lfsck_component *com,
565                                  const struct lu_fid *fid,
566                                  const __u8 flags, bool add)
567 {
568         struct lfsck_instance   *lfsck  = com->lc_lfsck;
569         struct dt_object        *obj;
570         struct lu_fid           *key    = &lfsck_env_info(env)->lti_fid3;
571         struct dt_device        *dev;
572         struct thandle          *th     = NULL;
573         int                      idx;
574         int                      rc     = 0;
575         __u8                     old    = 0;
576         __u8                     new    = 0;
577         ENTRY;
578
579         LASSERT(flags != 0);
580
581         if (unlikely(!fid_is_sane(fid)))
582                 RETURN(0);
583
584         idx = lfsck_sub_trace_file_fid2idx(fid);
585         obj = com->lc_sub_trace_objs[idx].lsto_obj;
586         dev = lfsck_obj2dev(obj);
587         mutex_lock(&com->lc_sub_trace_objs[idx].lsto_mutex);
588         fid_cpu_to_be(key, fid);
589         rc = dt_lookup(env, obj, (struct dt_rec *)&old,
590                        (const struct dt_key *)key, BYPASS_CAPA);
591         if (rc == -ENOENT) {
592                 if (!add)
593                         GOTO(unlock, rc = 0);
594
595                 old = 0;
596                 new = flags;
597         } else if (rc == 0) {
598                 if (add) {
599                         if ((old & flags) == flags)
600                                 GOTO(unlock, rc = 0);
601
602                         new = old | flags;
603                 } else {
604                         if ((old & flags) == 0)
605                                 GOTO(unlock, rc = 0);
606
607                         new = old & ~flags;
608                 }
609         } else {
610                 GOTO(log, rc);
611         }
612
613         th = dt_trans_create(env, dev);
614         if (IS_ERR(th))
615                 GOTO(log, rc = PTR_ERR(th));
616
617         if (old != 0) {
618                 rc = dt_declare_delete(env, obj,
619                                        (const struct dt_key *)key, th);
620                 if (rc != 0)
621                         GOTO(log, rc);
622         }
623
624         if (new != 0) {
625                 rc = dt_declare_insert(env, obj,
626                                        (const struct dt_rec *)&new,
627                                        (const struct dt_key *)key, th);
628                 if (rc != 0)
629                         GOTO(log, rc);
630         }
631
632         rc = dt_trans_start_local(env, dev, th);
633         if (rc != 0)
634                 GOTO(log, rc);
635
636         if (old != 0) {
637                 rc = dt_delete(env, obj, (const struct dt_key *)key,
638                                th, BYPASS_CAPA);
639                 if (rc != 0)
640                         GOTO(log, rc);
641         }
642
643         if (new != 0) {
644                 rc = dt_insert(env, obj, (const struct dt_rec *)&new,
645                                (const struct dt_key *)key, th, BYPASS_CAPA, 1);
646                 if (rc != 0)
647                         GOTO(log, rc);
648         }
649
650         GOTO(log, rc);
651
652 log:
653         if (th != NULL && !IS_ERR(th))
654                 dt_trans_stop(env, dev, th);
655
656         CDEBUG(D_LFSCK, "%s: namespace LFSCK %s flags for "DFID" in the "
657                "trace file, flags %x, old %x, new %x: rc = %d\n",
658                lfsck_lfsck2name(lfsck), add ? "add" : "del", PFID(fid),
659                (__u32)flags, (__u32)old, (__u32)new, rc);
660
661 unlock:
662         mutex_unlock(&com->lc_sub_trace_objs[idx].lsto_mutex);
663
664         return rc;
665 }
666
667 int lfsck_namespace_check_exist(const struct lu_env *env,
668                                 struct dt_object *dir,
669                                 struct dt_object *obj, const char *name)
670 {
671         struct lu_fid    *fid = &lfsck_env_info(env)->lti_fid;
672         int               rc;
673         ENTRY;
674
675         if (unlikely(lfsck_is_dead_obj(obj)))
676                 RETURN(LFSCK_NAMEENTRY_DEAD);
677
678         rc = dt_lookup(env, dir, (struct dt_rec *)fid,
679                        (const struct dt_key *)name, BYPASS_CAPA);
680         if (rc == -ENOENT)
681                 RETURN(LFSCK_NAMEENTRY_REMOVED);
682
683         if (rc < 0)
684                 RETURN(rc);
685
686         if (!lu_fid_eq(fid, lfsck_dto2fid(obj)))
687                 RETURN(LFSCK_NAMEENTRY_RECREATED);
688
689         RETURN(0);
690 }
691
692 static int lfsck_declare_namespace_exec_dir(const struct lu_env *env,
693                                             struct dt_object *obj,
694                                             struct thandle *handle)
695 {
696         int rc;
697
698         /* For destroying all invalid linkEA entries. */
699         rc = dt_declare_xattr_del(env, obj, XATTR_NAME_LINK, handle);
700         if (rc != 0)
701                 return rc;
702
703         /* For insert new linkEA entry. */
704         rc = dt_declare_xattr_set(env, obj,
705                         lfsck_buf_get_const(env, NULL, DEFAULT_LINKEA_SIZE),
706                         XATTR_NAME_LINK, 0, handle);
707         return rc;
708 }
709
710 int __lfsck_links_read(const struct lu_env *env, struct dt_object *obj,
711                        struct linkea_data *ldata)
712 {
713         int rc;
714
715         if (ldata->ld_buf->lb_buf == NULL)
716                 return -ENOMEM;
717
718         if (!dt_object_exists(obj))
719                 return -ENOENT;
720
721         rc = dt_xattr_get(env, obj, ldata->ld_buf, XATTR_NAME_LINK, BYPASS_CAPA);
722         if (rc == -ERANGE) {
723                 /* Buf was too small, figure out what we need. */
724                 rc = dt_xattr_get(env, obj, &LU_BUF_NULL, XATTR_NAME_LINK,
725                                   BYPASS_CAPA);
726                 if (rc <= 0)
727                         return rc;
728
729                 lu_buf_realloc(ldata->ld_buf, rc);
730                 if (ldata->ld_buf->lb_buf == NULL)
731                         return -ENOMEM;
732
733                 rc = dt_xattr_get(env, obj, ldata->ld_buf, XATTR_NAME_LINK,
734                                   BYPASS_CAPA);
735         }
736
737         if (rc > 0)
738                 rc = linkea_init(ldata);
739
740         return rc;
741 }
742
743 /**
744  * Remove linkEA for the given object.
745  *
746  * The caller should take the ldlm lock before the calling.
747  *
748  * \param[in] env       pointer to the thread context
749  * \param[in] com       pointer to the lfsck component
750  * \param[in] obj       pointer to the dt_object to be handled
751  *
752  * \retval              0 for repaired cases
753  * \retval              negative error number on failure
754  */
755 static int lfsck_namespace_links_remove(const struct lu_env *env,
756                                         struct lfsck_component *com,
757                                         struct dt_object *obj)
758 {
759         struct lfsck_instance           *lfsck  = com->lc_lfsck;
760         struct dt_device                *dev    = lfsck_obj2dev(obj);
761         struct thandle                  *th     = NULL;
762         int                              rc     = 0;
763         ENTRY;
764
765         LASSERT(dt_object_remote(obj) == 0);
766
767         th = dt_trans_create(env, dev);
768         if (IS_ERR(th))
769                 GOTO(log, rc = PTR_ERR(th));
770
771         rc = dt_declare_xattr_del(env, obj, XATTR_NAME_LINK, th);
772         if (rc != 0)
773                 GOTO(stop, rc);
774
775         rc = dt_trans_start_local(env, dev, th);
776         if (rc != 0)
777                 GOTO(stop, rc);
778
779         dt_write_lock(env, obj, 0);
780         if (unlikely(lfsck_is_dead_obj(obj)))
781                 GOTO(unlock, rc = -ENOENT);
782
783         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
784                 GOTO(unlock, rc = 0);
785
786         rc = dt_xattr_del(env, obj, XATTR_NAME_LINK, th, BYPASS_CAPA);
787
788         GOTO(unlock, rc);
789
790 unlock:
791         dt_write_unlock(env, obj);
792
793 stop:
794         dt_trans_stop(env, dev, th);
795
796 log:
797         CDEBUG(D_LFSCK, "%s: namespace LFSCK remove invalid linkEA "
798                "for the object "DFID": rc = %d\n",
799                lfsck_lfsck2name(lfsck), PFID(lfsck_dto2fid(obj)), rc);
800
801         if (rc == 0) {
802                 struct lfsck_namespace *ns = com->lc_file_ram;
803
804                 ns->ln_flags |= LF_INCONSISTENT;
805         }
806
807         return rc;
808 }
809
810 static int lfsck_links_write(const struct lu_env *env, struct dt_object *obj,
811                              struct linkea_data *ldata, struct thandle *handle)
812 {
813         const struct lu_buf *buf = lfsck_buf_get_const(env,
814                                                        ldata->ld_buf->lb_buf,
815                                                        ldata->ld_leh->leh_len);
816
817         return dt_xattr_set(env, obj, buf, XATTR_NAME_LINK, 0, handle,
818                             BYPASS_CAPA);
819 }
820
821 static void lfsck_namespace_unpack_linkea_entry(struct linkea_data *ldata,
822                                                 struct lu_name *cname,
823                                                 struct lu_fid *pfid,
824                                                 char *buf)
825 {
826         linkea_entry_unpack(ldata->ld_lee, &ldata->ld_reclen, cname, pfid);
827         /* To guarantee the 'name' is terminated with '0'. */
828         memcpy(buf, cname->ln_name, cname->ln_namelen);
829         buf[cname->ln_namelen] = 0;
830         cname->ln_name = buf;
831 }
832
833 static int lfsck_namespace_filter_linkea_entry(struct linkea_data *ldata,
834                                                struct lu_name *cname,
835                                                struct lu_fid *pfid,
836                                                bool remove)
837 {
838         struct link_ea_entry    *oldlee;
839         int                      oldlen;
840         int                      repeated = 0;
841
842         oldlee = ldata->ld_lee;
843         oldlen = ldata->ld_reclen;
844         linkea_next_entry(ldata);
845         while (ldata->ld_lee != NULL) {
846                 ldata->ld_reclen = (ldata->ld_lee->lee_reclen[0] << 8) |
847                                    ldata->ld_lee->lee_reclen[1];
848                 if (unlikely(ldata->ld_reclen == oldlen &&
849                              memcmp(ldata->ld_lee, oldlee, oldlen) == 0)) {
850                         repeated++;
851                         if (!remove)
852                                 break;
853
854                         linkea_del_buf(ldata, cname);
855                 } else {
856                         linkea_next_entry(ldata);
857                 }
858         }
859         ldata->ld_lee = oldlee;
860         ldata->ld_reclen = oldlen;
861
862         return repeated;
863 }
864
865 /**
866  * Insert orphan into .lustre/lost+found/MDTxxxx/ locally.
867  *
868  * Add the specified orphan MDT-object to the .lustre/lost+found/MDTxxxx/
869  * with the given type to generate the name, the detailed rules for name
870  * have been described as following.
871  *
872  * The function also generates the linkEA corresponding to the name entry
873  * under the .lustre/lost+found/MDTxxxx/ for the orphan MDT-object.
874  *
875  * \param[in] env       pointer to the thread context
876  * \param[in] com       pointer to the lfsck component
877  * \param[in] orphan    pointer to the orphan MDT-object
878  * \param[in] infix     additional information for the orphan name, such as
879  *                      the FID for original
880  * \param[in] type      the type for describing why the orphan MDT-object is
881  *                      created. The rules are as following:
882  *
883  *  type "D":           The MDT-object is a directory, it may knows its parent
884  *                      but because there is no valid linkEA, the LFSCK cannot
885  *                      know where to put it back to the namespace.
886  *  type "O":           The MDT-object has no linkEA, and there is no name
887  *                      entry that references the MDT-object.
888  *
889  *  type "S":           The orphan MDT-object is a shard of a striped directory
890  *
891  * \see lfsck_layout_recreate_parent() for more types.
892  *
893  * The orphan name will be like:
894  * ${FID}-${infix}-${type}-${conflict_version}
895  *
896  * \param[out] count    if some others inserted some linkEA entries by race,
897  *                      then return the linkEA entries count.
898  *
899  * \retval              positive number for repaired cases
900  * \retval              0 if needs to repair nothing
901  * \retval              negative error number on failure
902  */
903 static int lfsck_namespace_insert_orphan(const struct lu_env *env,
904                                          struct lfsck_component *com,
905                                          struct dt_object *orphan,
906                                          const char *infix, const char *type,
907                                          int *count)
908 {
909         struct lfsck_thread_info        *info   = lfsck_env_info(env);
910         struct lu_name                  *cname  = &info->lti_name;
911         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
912         struct lu_attr                  *la     = &info->lti_la3;
913         const struct lu_fid             *cfid   = lfsck_dto2fid(orphan);
914         const struct lu_fid             *pfid;
915         struct lu_fid                    tfid;
916         struct lfsck_instance           *lfsck  = com->lc_lfsck;
917         struct dt_device                *dev    = lfsck_obj2dev(orphan);
918         struct dt_object                *parent;
919         struct thandle                  *th     = NULL;
920         struct lfsck_lock_handle        *pllh   = &info->lti_llh;
921         struct lustre_handle             clh    = { 0 };
922         struct linkea_data               ldata  = { NULL };
923         struct lu_buf                    linkea_buf;
924         int                              namelen;
925         int                              idx    = 0;
926         int                              rc     = 0;
927         bool                             exist  = false;
928         ENTRY;
929
930         cname->ln_name = NULL;
931         if (unlikely(lfsck->li_lpf_obj == NULL))
932                 GOTO(log, rc = -ENXIO);
933
934         parent = lfsck->li_lpf_obj;
935         pfid = lfsck_dto2fid(parent);
936
937 again:
938         do {
939                 namelen = snprintf(info->lti_key, NAME_MAX, DFID"%s-%s-%d",
940                                    PFID(cfid), infix, type, idx++);
941                 rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
942                                (const struct dt_key *)info->lti_key,
943                                BYPASS_CAPA);
944                 if (rc != 0 && rc != -ENOENT)
945                         GOTO(log, rc);
946
947                 if (unlikely(rc == 0 && lu_fid_eq(cfid, &tfid)))
948                         exist = true;
949         } while (rc == 0 && !exist);
950
951         rc = lfsck_lock(env, lfsck, parent, info->lti_key, pllh,
952                         MDS_INODELOCK_UPDATE, LCK_PW);
953         if (rc != 0)
954                 GOTO(log, rc);
955
956         /* Re-check whether the name conflict with othrs after taken
957          * the ldlm lock. */
958         rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
959                        (const struct dt_key *)info->lti_key, BYPASS_CAPA);
960         if (rc == 0) {
961                 if (!lu_fid_eq(cfid, &tfid)) {
962                         exist = false;
963                         lfsck_unlock(pllh);
964                         goto again;
965                 }
966
967                 exist = true;
968         } else if (rc != -ENOENT) {
969                 GOTO(log, rc);
970         } else {
971                 exist = false;
972         }
973
974         cname->ln_name = info->lti_key;
975         cname->ln_namelen = namelen;
976         rc = linkea_data_new(&ldata, &info->lti_linkea_buf2);
977         if (rc != 0)
978                 GOTO(log, rc);
979
980         rc = linkea_add_buf(&ldata, cname, pfid);
981         if (rc != 0)
982                 GOTO(log, rc);
983
984         rc = lfsck_ibits_lock(env, lfsck, orphan, &clh,
985                               MDS_INODELOCK_UPDATE | MDS_INODELOCK_LOOKUP |
986                               MDS_INODELOCK_XATTR, LCK_EX);
987         if (rc != 0)
988                 GOTO(log, rc);
989
990         lfsck_buf_init(&linkea_buf, ldata.ld_buf->lb_buf,
991                        ldata.ld_leh->leh_len);
992         th = dt_trans_create(env, dev);
993         if (IS_ERR(th))
994                 GOTO(log, rc = PTR_ERR(th));
995
996         if (S_ISDIR(lfsck_object_type(orphan))) {
997                 rc = dt_declare_delete(env, orphan,
998                                        (const struct dt_key *)dotdot, th);
999                 if (rc != 0)
1000                         GOTO(stop, rc);
1001
1002                 rec->rec_type = S_IFDIR;
1003                 rec->rec_fid = pfid;
1004                 rc = dt_declare_insert(env, orphan, (const struct dt_rec *)rec,
1005                                        (const struct dt_key *)dotdot, th);
1006                 if (rc != 0)
1007                         GOTO(stop, rc);
1008         }
1009
1010         rc = dt_declare_xattr_set(env, orphan, &linkea_buf,
1011                                   XATTR_NAME_LINK, 0, th);
1012         if (rc != 0)
1013                 GOTO(stop, rc);
1014
1015         if (!exist) {
1016                 rec->rec_type = lfsck_object_type(orphan) & S_IFMT;
1017                 rec->rec_fid = cfid;
1018                 rc = dt_declare_insert(env, parent, (const struct dt_rec *)rec,
1019                                        (const struct dt_key *)cname->ln_name,
1020                                        th);
1021                 if (rc != 0)
1022                         GOTO(stop, rc);
1023
1024                 if (S_ISDIR(rec->rec_type)) {
1025                         rc = dt_declare_ref_add(env, parent, th);
1026                         if (rc != 0)
1027                                 GOTO(stop, rc);
1028                 }
1029         }
1030
1031         memset(la, 0, sizeof(*la));
1032         la->la_ctime = cfs_time_current_sec();
1033         la->la_valid = LA_CTIME;
1034         rc = dt_declare_attr_set(env, orphan, la, th);
1035         if (rc != 0)
1036                 GOTO(stop, rc);
1037
1038         rc = dt_trans_start_local(env, dev, th);
1039         if (rc != 0)
1040                 GOTO(stop, rc);
1041
1042         dt_write_lock(env, orphan, 0);
1043         rc = lfsck_links_read(env, orphan, &ldata);
1044         if (likely((rc == -ENODATA) || (rc == -EINVAL) ||
1045                    (rc == 0 && ldata.ld_leh->leh_reccount == 0))) {
1046                 if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1047                         GOTO(unlock, rc = 1);
1048
1049                 if (S_ISDIR(lfsck_object_type(orphan))) {
1050                         rc = dt_delete(env, orphan,
1051                                        (const struct dt_key *)dotdot, th,
1052                                        BYPASS_CAPA);
1053                         if (rc != 0)
1054                                 GOTO(unlock, rc);
1055
1056                         rec->rec_type = S_IFDIR;
1057                         rec->rec_fid = pfid;
1058                         rc = dt_insert(env, orphan, (const struct dt_rec *)rec,
1059                                        (const struct dt_key *)dotdot, th,
1060                                        BYPASS_CAPA, 1);
1061                         if (rc != 0)
1062                                 GOTO(unlock, rc);
1063                 }
1064
1065                 rc = dt_xattr_set(env, orphan, &linkea_buf, XATTR_NAME_LINK, 0,
1066                                   th, BYPASS_CAPA);
1067         } else {
1068                 if (rc == 0 && count != NULL)
1069                         *count = ldata.ld_leh->leh_reccount;
1070
1071                 GOTO(unlock, rc);
1072         }
1073         dt_write_unlock(env, orphan);
1074
1075         if (rc == 0 && !exist) {
1076                 rec->rec_type = lfsck_object_type(orphan) & S_IFMT;
1077                 rec->rec_fid = cfid;
1078                 rc = dt_insert(env, parent, (const struct dt_rec *)rec,
1079                                (const struct dt_key *)cname->ln_name,
1080                                th, BYPASS_CAPA, 1);
1081                 if (rc == 0 && S_ISDIR(rec->rec_type)) {
1082                         dt_write_lock(env, parent, 0);
1083                         rc = dt_ref_add(env, parent, th);
1084                         dt_write_unlock(env, parent);
1085                 }
1086         }
1087
1088         if (rc == 0)
1089                 rc = dt_attr_set(env, orphan, la, th, BYPASS_CAPA);
1090
1091         GOTO(stop, rc = (rc == 0 ? 1 : rc));
1092
1093 unlock:
1094         dt_write_unlock(env, orphan);
1095
1096 stop:
1097         dt_trans_stop(env, dev, th);
1098
1099 log:
1100         lfsck_ibits_unlock(&clh, LCK_EX);
1101         lfsck_unlock(pllh);
1102         CDEBUG(D_LFSCK, "%s: namespace LFSCK insert orphan for the "
1103                "object "DFID", name = %s: rc = %d\n",
1104                lfsck_lfsck2name(lfsck), PFID(cfid),
1105                cname->ln_name != NULL ? cname->ln_name : "<NULL>", rc);
1106
1107         if (rc != 0) {
1108                 struct lfsck_namespace *ns = com->lc_file_ram;
1109
1110                 ns->ln_flags |= LF_INCONSISTENT;
1111         }
1112
1113         return rc;
1114 }
1115
1116 /**
1117  * Add the specified name entry back to namespace.
1118  *
1119  * If there is a linkEA entry that back references a name entry under
1120  * some parent directory, but such parent directory does not have the
1121  * claimed name entry. On the other hand, the linkEA entries count is
1122  * not larger than the MDT-object's hard link count. Under such case,
1123  * it is quite possible that the name entry is lost. Then the LFSCK
1124  * should add the name entry back to the namespace.
1125  *
1126  * \param[in] env       pointer to the thread context
1127  * \param[in] com       pointer to the lfsck component
1128  * \param[in] parent    pointer to the directory under which the name entry
1129  *                      will be inserted into
1130  * \param[in] child     pointer to the object referenced by the name entry
1131  *                      that to be inserted into the parent
1132  * \param[in] name      the name for the child in the parent directory
1133  *
1134  * \retval              positive number for repaired cases
1135  * \retval              0 if nothing to be repaired
1136  * \retval              negative error number on failure
1137  */
1138 static int lfsck_namespace_insert_normal(const struct lu_env *env,
1139                                          struct lfsck_component *com,
1140                                          struct dt_object *parent,
1141                                          struct dt_object *child,
1142                                          const char *name)
1143 {
1144         struct lfsck_thread_info        *info   = lfsck_env_info(env);
1145         struct lu_attr                  *la     = &info->lti_la;
1146         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
1147         struct lfsck_instance           *lfsck  = com->lc_lfsck;
1148         /* The child and its name may be on different MDTs. */
1149         struct dt_device                *dev    = lfsck->li_next;
1150         struct dt_object                *pobj   = NULL;
1151         struct dt_object                *cobj   = NULL;
1152         struct thandle                  *th     = NULL;
1153         struct lfsck_lock_handle        *llh    = &info->lti_llh;
1154         int                              rc     = 0;
1155         ENTRY;
1156
1157         /* @parent/@child may be based on lfsck->li_bottom,
1158          * but here we need the object based on the lfsck->li_next. */
1159
1160         pobj = lfsck_object_locate(dev, parent);
1161         if (IS_ERR(pobj))
1162                 GOTO(log, rc = PTR_ERR(pobj));
1163
1164         if (unlikely(!dt_try_as_dir(env, pobj)))
1165                 GOTO(log, rc = -ENOTDIR);
1166
1167         cobj = lfsck_object_locate(dev, child);
1168         if (IS_ERR(cobj))
1169                 GOTO(log, rc = PTR_ERR(cobj));
1170
1171         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1172                 GOTO(log, rc = 1);
1173
1174         rc = lfsck_lock(env, lfsck, parent, name, llh,
1175                         MDS_INODELOCK_UPDATE, LCK_PW);
1176         if (rc != 0)
1177                 GOTO(log, rc);
1178
1179         th = dt_trans_create(env, dev);
1180         if (IS_ERR(th))
1181                 GOTO(unlock, rc = PTR_ERR(th));
1182
1183         rec->rec_type = lfsck_object_type(cobj) & S_IFMT;
1184         rec->rec_fid = lfsck_dto2fid(cobj);
1185         rc = dt_declare_insert(env, pobj, (const struct dt_rec *)rec,
1186                                (const struct dt_key *)name, th);
1187         if (rc != 0)
1188                 GOTO(stop, rc);
1189
1190         if (S_ISDIR(rec->rec_type)) {
1191                 rc = dt_declare_ref_add(env, pobj, th);
1192                 if (rc != 0)
1193                         GOTO(stop, rc);
1194         }
1195
1196         memset(la, 0, sizeof(*la));
1197         la->la_ctime = cfs_time_current_sec();
1198         la->la_valid = LA_CTIME;
1199         rc = dt_declare_attr_set(env, pobj, la, th);
1200         if (rc != 0)
1201                 GOTO(stop, rc);
1202
1203         rc = dt_declare_attr_set(env, cobj, la, th);
1204         if (rc != 0)
1205                 GOTO(stop, rc);
1206
1207         rc = dt_trans_start_local(env, dev, th);
1208         if (rc != 0)
1209                 GOTO(stop, rc);
1210
1211         rc = dt_insert(env, pobj, (const struct dt_rec *)rec,
1212                        (const struct dt_key *)name, th, BYPASS_CAPA, 1);
1213         if (rc != 0)
1214                 GOTO(stop, rc);
1215
1216         if (S_ISDIR(rec->rec_type)) {
1217                 dt_write_lock(env, pobj, 0);
1218                 rc = dt_ref_add(env, pobj, th);
1219                 dt_write_unlock(env, pobj);
1220                 if (rc != 0)
1221                         GOTO(stop, rc);
1222         }
1223
1224         la->la_ctime = cfs_time_current_sec();
1225         rc = dt_attr_set(env, pobj, la, th, BYPASS_CAPA);
1226         if (rc != 0)
1227                 GOTO(stop, rc);
1228
1229         rc = dt_attr_set(env, cobj, la, th, BYPASS_CAPA);
1230
1231         GOTO(stop, rc = (rc == 0 ? 1 : rc));
1232
1233 stop:
1234         dt_trans_stop(env, dev, th);
1235
1236 unlock:
1237         lfsck_unlock(llh);
1238
1239 log:
1240         CDEBUG(D_LFSCK, "%s: namespace LFSCK insert object "DFID" with "
1241                "the name %s and type %o to the parent "DFID": rc = %d\n",
1242                lfsck_lfsck2name(lfsck), PFID(lfsck_dto2fid(child)), name,
1243                lfsck_object_type(child) & S_IFMT,
1244                PFID(lfsck_dto2fid(parent)), rc);
1245
1246         if (rc != 0) {
1247                 struct lfsck_namespace *ns = com->lc_file_ram;
1248
1249                 ns->ln_flags |= LF_INCONSISTENT;
1250                 if (rc > 0)
1251                         ns->ln_lost_dirent_repaired++;
1252         }
1253
1254         return rc;
1255 }
1256
1257 /**
1258  * Create the specified orphan directory.
1259  *
1260  * For the case that the parent MDT-object stored in some MDT-object's
1261  * linkEA entry is lost, the LFSCK will re-create the parent object as
1262  * an orphan and insert it into .lustre/lost+found/MDTxxxx/ directory
1263  * with the name ${FID}-P-${conflict_version}.
1264  *
1265  * \param[in] env       pointer to the thread context
1266  * \param[in] com       pointer to the lfsck component
1267  * \param[in] orphan    pointer to the orphan MDT-object to be created
1268  * \param[in] lmv       pointer to master LMV EA that will be set to the orphan
1269  *
1270  * \retval              positive number for repaired cases
1271  * \retval              negative error number on failure
1272  */
1273 static int lfsck_namespace_create_orphan_dir(const struct lu_env *env,
1274                                              struct lfsck_component *com,
1275                                              struct dt_object *orphan,
1276                                              struct lmv_mds_md_v1 *lmv)
1277 {
1278         struct lfsck_thread_info        *info   = lfsck_env_info(env);
1279         struct lu_attr                  *la     = &info->lti_la;
1280         struct dt_allocation_hint       *hint   = &info->lti_hint;
1281         struct dt_object_format         *dof    = &info->lti_dof;
1282         struct lu_name                  *cname  = &info->lti_name2;
1283         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
1284         struct lmv_mds_md_v1            *lmv2   = &info->lti_lmv2;
1285         const struct lu_fid             *cfid   = lfsck_dto2fid(orphan);
1286         struct lu_fid                    tfid;
1287         struct lfsck_instance           *lfsck  = com->lc_lfsck;
1288         struct lfsck_namespace          *ns     = com->lc_file_ram;
1289         struct dt_device                *dev    = lfsck_obj2dev(orphan);
1290         struct dt_object                *parent = NULL;
1291         struct thandle                  *th     = NULL;
1292         struct lfsck_lock_handle        *llh    = &info->lti_llh;
1293         struct linkea_data               ldata  = { NULL };
1294         struct lu_buf                    linkea_buf;
1295         struct lu_buf                    lmv_buf;
1296         char                             name[32];
1297         int                              namelen;
1298         int                              idx    = 0;
1299         int                              rc     = 0;
1300         ENTRY;
1301
1302         LASSERT(!dt_object_exists(orphan));
1303
1304         cname->ln_name = NULL;
1305         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1306                 GOTO(log, rc = 1);
1307
1308         if (dt_object_remote(orphan)) {
1309                 LASSERT(lfsck->li_lpf_root_obj != NULL);
1310
1311                 idx = lfsck_find_mdt_idx_by_fid(env, lfsck, cfid);
1312                 if (idx < 0)
1313                         GOTO(log, rc = idx);
1314
1315                 snprintf(name, 8, "MDT%04x", idx);
1316                 rc = dt_lookup(env, lfsck->li_lpf_root_obj,
1317                                (struct dt_rec *)&tfid,
1318                                (const struct dt_key *)name, BYPASS_CAPA);
1319                 if (rc != 0)
1320                         GOTO(log, rc = (rc == -ENOENT ? -ENXIO : rc));
1321
1322                 parent = lfsck_object_find_bottom(env, lfsck, &tfid);
1323                 if (IS_ERR(parent))
1324                         GOTO(log, rc = PTR_ERR(parent));
1325
1326                 if (unlikely(!dt_try_as_dir(env, parent)))
1327                         GOTO(log, rc = -ENOTDIR);
1328         } else {
1329                 if (unlikely(lfsck->li_lpf_obj == NULL))
1330                         GOTO(log, rc = -ENXIO);
1331
1332                 parent = lfsck->li_lpf_obj;
1333         }
1334
1335         dev = lfsck_find_dev_by_fid(env, lfsck, cfid);
1336         if (IS_ERR(dev))
1337                 GOTO(log, rc = PTR_ERR(dev));
1338
1339         idx = 0;
1340
1341 again:
1342         do {
1343                 namelen = snprintf(name, 31, DFID"-P-%d",
1344                                    PFID(cfid), idx++);
1345                 rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
1346                                (const struct dt_key *)name, BYPASS_CAPA);
1347                 if (rc != 0 && rc != -ENOENT)
1348                         GOTO(log, rc);
1349         } while (rc == 0);
1350
1351         rc = lfsck_lock(env, lfsck, parent, name, llh,
1352                         MDS_INODELOCK_UPDATE, LCK_PW);
1353         if (rc != 0)
1354                 GOTO(log, rc);
1355
1356         /* Re-check whether the name conflict with othrs after taken
1357          * the ldlm lock. */
1358         rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
1359                        (const struct dt_key *)name, BYPASS_CAPA);
1360         if (unlikely(rc == 0)) {
1361                 lfsck_unlock(llh);
1362                 goto again;
1363         }
1364
1365         if (rc != -ENOENT)
1366                 GOTO(unlock1, rc);
1367
1368         cname->ln_name = name;
1369         cname->ln_namelen = namelen;
1370
1371         memset(la, 0, sizeof(*la));
1372         la->la_mode = S_IFDIR | 0700;
1373         la->la_valid = LA_TYPE | LA_MODE | LA_UID | LA_GID |
1374                        LA_ATIME | LA_MTIME | LA_CTIME;
1375
1376         orphan->do_ops->do_ah_init(env, hint, parent, orphan,
1377                                    la->la_mode & S_IFMT);
1378
1379         memset(dof, 0, sizeof(*dof));
1380         dof->dof_type = dt_mode_to_dft(S_IFDIR);
1381
1382         rc = linkea_data_new(&ldata, &info->lti_linkea_buf2);
1383         if (rc != 0)
1384                 GOTO(unlock1, rc);
1385
1386         rc = linkea_add_buf(&ldata, cname, lfsck_dto2fid(parent));
1387         if (rc != 0)
1388                 GOTO(unlock1, rc);
1389
1390         th = dt_trans_create(env, dev);
1391         if (IS_ERR(th))
1392                 GOTO(unlock1, rc = PTR_ERR(th));
1393
1394         /* Sync the remote transaction to guarantee that the subsequent
1395          * lock against the @orphan can find the @orphan in time. */
1396         if (dt_object_remote(orphan))
1397                 th->th_sync = 1;
1398
1399         rc = dt_declare_create(env, orphan, la, hint, dof, th);
1400         if (rc != 0)
1401                 GOTO(stop, rc);
1402
1403         if (unlikely(!dt_try_as_dir(env, orphan)))
1404                 GOTO(stop, rc = -ENOTDIR);
1405
1406         rec->rec_type = S_IFDIR;
1407         rec->rec_fid = cfid;
1408         rc = dt_declare_insert(env, orphan, (const struct dt_rec *)rec,
1409                                (const struct dt_key *)dot, th);
1410         if (rc != 0)
1411                 GOTO(stop, rc);
1412
1413         rec->rec_fid = lfsck_dto2fid(parent);
1414         rc = dt_declare_insert(env, orphan, (const struct dt_rec *)rec,
1415                                (const struct dt_key *)dotdot, th);
1416         if (rc == 0)
1417                 rc = dt_declare_ref_add(env, orphan, th);
1418
1419         if (rc != 0)
1420                 GOTO(stop, rc);
1421
1422         rc = dt_declare_ref_add(env, orphan, th);
1423         if (rc != 0)
1424                 GOTO(stop, rc);
1425
1426         if (lmv != NULL) {
1427                 lmv->lmv_magic = LMV_MAGIC;
1428                 lmv->lmv_master_mdt_index = lfsck_dev_idx(lfsck);
1429                 lfsck_lmv_header_cpu_to_le(lmv2, lmv);
1430                 lfsck_buf_init(&lmv_buf, lmv2, sizeof(*lmv2));
1431                 rc = dt_declare_xattr_set(env, orphan, &lmv_buf,
1432                                           XATTR_NAME_LMV, 0, th);
1433                 if (rc != 0)
1434                         GOTO(stop, rc);
1435         }
1436
1437         lfsck_buf_init(&linkea_buf, ldata.ld_buf->lb_buf,
1438                        ldata.ld_leh->leh_len);
1439         rc = dt_declare_xattr_set(env, orphan, &linkea_buf,
1440                                   XATTR_NAME_LINK, 0, th);
1441         if (rc != 0)
1442                 GOTO(stop, rc);
1443
1444         rec->rec_fid = cfid;
1445         rc = dt_declare_insert(env, parent, (const struct dt_rec *)rec,
1446                                (const struct dt_key *)name, th);
1447         if (rc == 0)
1448                 rc = dt_declare_ref_add(env, parent, th);
1449
1450         if (rc != 0)
1451                 GOTO(stop, rc);
1452
1453         rc = dt_trans_start_local(env, dev, th);
1454         if (rc != 0)
1455                 GOTO(stop, rc);
1456
1457         dt_write_lock(env, orphan, 0);
1458         rc = dt_create(env, orphan, la, hint, dof, th);
1459         if (rc != 0)
1460                 GOTO(unlock2, rc);
1461
1462         rec->rec_fid = cfid;
1463         rc = dt_insert(env, orphan, (const struct dt_rec *)rec,
1464                        (const struct dt_key *)dot, th, BYPASS_CAPA, 1);
1465         if (rc != 0)
1466                 GOTO(unlock2, rc);
1467
1468         rec->rec_fid = lfsck_dto2fid(parent);
1469         rc = dt_insert(env, orphan, (const struct dt_rec *)rec,
1470                        (const struct dt_key *)dotdot, th,
1471                        BYPASS_CAPA, 1);
1472         if (rc != 0)
1473                 GOTO(unlock2, rc);
1474
1475         rc = dt_ref_add(env, orphan, th);
1476         if (rc != 0)
1477                 GOTO(unlock2, rc);
1478
1479         if (lmv != NULL) {
1480                 rc = dt_xattr_set(env, orphan, &lmv_buf, XATTR_NAME_LMV, 0,
1481                                   th, BYPASS_CAPA);
1482                 if (rc != 0)
1483                         GOTO(unlock2, rc);
1484         }
1485
1486         rc = dt_xattr_set(env, orphan, &linkea_buf,
1487                           XATTR_NAME_LINK, 0, th, BYPASS_CAPA);
1488         dt_write_unlock(env, orphan);
1489         if (rc != 0)
1490                 GOTO(stop, rc);
1491
1492         rec->rec_fid = cfid;
1493         rc = dt_insert(env, parent, (const struct dt_rec *)rec,
1494                        (const struct dt_key *)name, th, BYPASS_CAPA, 1);
1495         if (rc == 0) {
1496                 dt_write_lock(env, parent, 0);
1497                 rc = dt_ref_add(env, parent, th);
1498                 dt_write_unlock(env, parent);
1499         }
1500
1501         GOTO(stop, rc = (rc == 0 ? 1 : rc));
1502
1503 unlock2:
1504         dt_write_unlock(env, orphan);
1505
1506 stop:
1507         dt_trans_stop(env, dev, th);
1508
1509 unlock1:
1510         lfsck_unlock(llh);
1511
1512 log:
1513         CDEBUG(D_LFSCK, "%s: namespace LFSCK create orphan dir for "
1514                "the object "DFID", name = %s: rc = %d\n",
1515                lfsck_lfsck2name(lfsck), PFID(cfid),
1516                cname->ln_name != NULL ? cname->ln_name : "<NULL>", rc);
1517
1518         if (parent != NULL && !IS_ERR(parent) && parent != lfsck->li_lpf_obj)
1519                 lfsck_object_put(env, parent);
1520
1521         if (rc != 0)
1522                 ns->ln_flags |= LF_INCONSISTENT;
1523
1524         return rc;
1525 }
1526
1527 /**
1528  * Remove the specified entry from the linkEA.
1529  *
1530  * Locate the linkEA entry with the given @cname and @pfid, then
1531  * remove this entry or the other entries those are repeated with
1532  * this entry.
1533  *
1534  * \param[in] env       pointer to the thread context
1535  * \param[in] com       pointer to the lfsck component
1536  * \param[in] obj       pointer to the dt_object to be handled
1537  * \param[in,out]ldata  pointer to the buffer that holds the linkEA
1538  * \param[in] cname     the name for the child in the parent directory
1539  * \param[in] pfid      the parent directory's FID for the linkEA
1540  * \param[in] next      if true, then remove the first found linkEA
1541  *                      entry, and move the ldata->ld_lee to next entry
1542  *
1543  * \retval              positive number for repaired cases
1544  * \retval              0 if nothing to be repaired
1545  * \retval              negative error number on failure
1546  */
1547 static int lfsck_namespace_shrink_linkea(const struct lu_env *env,
1548                                          struct lfsck_component *com,
1549                                          struct dt_object *obj,
1550                                          struct linkea_data *ldata,
1551                                          struct lu_name *cname,
1552                                          struct lu_fid *pfid,
1553                                          bool next)
1554 {
1555         struct lfsck_instance           *lfsck     = com->lc_lfsck;
1556         struct dt_device                *dev       = lfsck_obj2dev(obj);
1557         struct lfsck_bookmark           *bk        = &lfsck->li_bookmark_ram;
1558         struct thandle                  *th        = NULL;
1559         struct lustre_handle             lh        = { 0 };
1560         struct linkea_data               ldata_new = { NULL };
1561         struct lu_buf                    linkea_buf;
1562         int                              rc        = 0;
1563         ENTRY;
1564
1565         rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
1566                               MDS_INODELOCK_UPDATE | MDS_INODELOCK_XATTR,
1567                               LCK_EX);
1568         if (rc != 0)
1569                 GOTO(log, rc);
1570
1571         if (next)
1572                 linkea_del_buf(ldata, cname);
1573         else
1574                 lfsck_namespace_filter_linkea_entry(ldata, cname, pfid,
1575                                                     true);
1576         lfsck_buf_init(&linkea_buf, ldata->ld_buf->lb_buf,
1577                        ldata->ld_leh->leh_len);
1578
1579 again:
1580         th = dt_trans_create(env, dev);
1581         if (IS_ERR(th))
1582                 GOTO(unlock1, rc = PTR_ERR(th));
1583
1584         rc = dt_declare_xattr_set(env, obj, &linkea_buf,
1585                                   XATTR_NAME_LINK, 0, th);
1586         if (rc != 0)
1587                 GOTO(stop, rc);
1588
1589         rc = dt_trans_start_local(env, dev, th);
1590         if (rc != 0)
1591                 GOTO(stop, rc);
1592
1593         dt_write_lock(env, obj, 0);
1594         if (unlikely(lfsck_is_dead_obj(obj)))
1595                 GOTO(unlock2, rc = -ENOENT);
1596
1597         rc = lfsck_links_read2(env, obj, &ldata_new);
1598         if (rc != 0)
1599                 GOTO(unlock2, rc);
1600
1601         /* The specified linkEA entry has been removed by race. */
1602         rc = linkea_links_find(&ldata_new, cname, pfid);
1603         if (rc != 0)
1604                 GOTO(unlock2, rc = 0);
1605
1606         if (bk->lb_param & LPF_DRYRUN)
1607                 GOTO(unlock2, rc = 1);
1608
1609         if (next)
1610                 linkea_del_buf(&ldata_new, cname);
1611         else
1612                 lfsck_namespace_filter_linkea_entry(&ldata_new, cname, pfid,
1613                                                     true);
1614
1615         if (linkea_buf.lb_len < ldata_new.ld_leh->leh_len) {
1616                 dt_write_unlock(env, obj);
1617                 dt_trans_stop(env, dev, th);
1618                 lfsck_buf_init(&linkea_buf, ldata_new.ld_buf->lb_buf,
1619                                ldata_new.ld_leh->leh_len);
1620                 goto again;
1621         }
1622
1623         lfsck_buf_init(&linkea_buf, ldata_new.ld_buf->lb_buf,
1624                        ldata_new.ld_leh->leh_len);
1625         rc = dt_xattr_set(env, obj, &linkea_buf,
1626                           XATTR_NAME_LINK, 0, th, BYPASS_CAPA);
1627
1628         GOTO(unlock2, rc = (rc == 0 ? 1 : rc));
1629
1630 unlock2:
1631         dt_write_unlock(env, obj);
1632
1633 stop:
1634         dt_trans_stop(env, dev, th);
1635
1636 unlock1:
1637         lfsck_ibits_unlock(&lh, LCK_EX);
1638
1639 log:
1640         CDEBUG(D_LFSCK, "%s: namespace LFSCK remove %s linkEA entry "
1641                "for the object: "DFID", parent "DFID", name %.*s\n",
1642                lfsck_lfsck2name(lfsck), next ? "invalid" : "redundant",
1643                PFID(lfsck_dto2fid(obj)), PFID(pfid), cname->ln_namelen,
1644                cname->ln_name);
1645
1646         if (rc != 0) {
1647                 struct lfsck_namespace *ns = com->lc_file_ram;
1648
1649                 ns->ln_flags |= LF_INCONSISTENT;
1650         }
1651
1652         return rc;
1653 }
1654
1655 /**
1656  * Conditionally remove the specified entry from the linkEA.
1657  *
1658  * Take the parent lock firstly, then check whether the specified
1659  * name entry exists or not: if yes, do nothing; otherwise, call
1660  * lfsck_namespace_shrink_linkea() to remove the linkea entry.
1661  *
1662  * \param[in] env       pointer to the thread context
1663  * \param[in] com       pointer to the lfsck component
1664  * \param[in] parent    pointer to the parent directory
1665  * \param[in] child     pointer to the child object that holds the linkEA
1666  * \param[in,out]ldata  pointer to the buffer that holds the linkEA
1667  * \param[in] cname     the name for the child in the parent directory
1668  * \param[in] pfid      the parent directory's FID for the linkEA
1669  *
1670  * \retval              positive number for repaired cases
1671  * \retval              0 if nothing to be repaired
1672  * \retval              negative error number on failure
1673  */
1674 static int lfsck_namespace_shrink_linkea_cond(const struct lu_env *env,
1675                                               struct lfsck_component *com,
1676                                               struct dt_object *parent,
1677                                               struct dt_object *child,
1678                                               struct linkea_data *ldata,
1679                                               struct lu_name *cname,
1680                                               struct lu_fid *pfid)
1681 {
1682         struct lfsck_thread_info *info  = lfsck_env_info(env);
1683         struct lu_fid            *cfid  = &info->lti_fid3;
1684         struct lfsck_lock_handle *llh   = &info->lti_llh;
1685         int                       rc;
1686         ENTRY;
1687
1688         rc = lfsck_lock(env, com->lc_lfsck, parent, cname->ln_name, llh,
1689                         MDS_INODELOCK_UPDATE, LCK_PR);
1690         if (rc != 0)
1691                 RETURN(rc);
1692
1693         dt_read_lock(env, parent, 0);
1694         if (unlikely(lfsck_is_dead_obj(parent))) {
1695                 dt_read_unlock(env, parent);
1696                 lfsck_unlock(llh);
1697                 rc = lfsck_namespace_shrink_linkea(env, com, child, ldata,
1698                                                    cname, pfid, true);
1699
1700                 RETURN(rc);
1701         }
1702
1703         rc = dt_lookup(env, parent, (struct dt_rec *)cfid,
1704                        (const struct dt_key *)cname->ln_name,
1705                        BYPASS_CAPA);
1706         dt_read_unlock(env, parent);
1707
1708         /* It is safe to release the ldlm lock, because when the logic come
1709          * here, we have got all the needed information above whether the
1710          * linkEA entry is valid or not. It is not important that others
1711          * may add new linkEA entry after the ldlm lock released. If other
1712          * has removed the specified linkEA entry by race, then it is OK,
1713          * because the subsequent lfsck_namespace_shrink_linkea() can handle
1714          * such case. */
1715         lfsck_unlock(llh);
1716         if (rc == -ENOENT) {
1717                 rc = lfsck_namespace_shrink_linkea(env, com, child, ldata,
1718                                                    cname, pfid, true);
1719
1720                 RETURN(rc);
1721         }
1722
1723         if (rc != 0)
1724                 RETURN(rc);
1725
1726         /* The LFSCK just found some internal status of cross-MDTs
1727          * create operation. That is normal. */
1728         if (lu_fid_eq(cfid, lfsck_dto2fid(child))) {
1729                 linkea_next_entry(ldata);
1730
1731                 RETURN(0);
1732         }
1733
1734         rc = lfsck_namespace_shrink_linkea(env, com, child, ldata, cname,
1735                                            pfid, true);
1736
1737         RETURN(rc);
1738 }
1739
1740 /**
1741  * Conditionally replace name entry in the parent.
1742  *
1743  * As required, the LFSCK may re-create the lost MDT-object for dangling
1744  * name entry, but such repairing may be wrong because of bad FID in the
1745  * name entry. As the LFSCK processing, the real MDT-object may be found,
1746  * then the LFSCK should check whether the former re-created MDT-object
1747  * has been modified or not, if not, then destroy it and update the name
1748  * entry in the parent to reference the real MDT-object.
1749  *
1750  * \param[in] env       pointer to the thread context
1751  * \param[in] com       pointer to the lfsck component
1752  * \param[in] parent    pointer to the parent directory
1753  * \param[in] child     pointer to the MDT-object that may be the real
1754  *                      MDT-object corresponding to the name entry in parent
1755  * \param[in] cfid      the current FID in the name entry
1756  * \param[in] cname     contains the name of the child in the parent directory
1757  *
1758  * \retval              positive number for repaired cases
1759  * \retval              0 if nothing to be repaired
1760  * \retval              negative error number on failure
1761  */
1762 static int lfsck_namespace_replace_cond(const struct lu_env *env,
1763                                         struct lfsck_component *com,
1764                                         struct dt_object *parent,
1765                                         struct dt_object *child,
1766                                         const struct lu_fid *cfid,
1767                                         const struct lu_name *cname)
1768 {
1769         struct lfsck_thread_info        *info   = lfsck_env_info(env);
1770         struct lu_attr                  *la     = &info->lti_la;
1771         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
1772         struct lu_fid                    tfid;
1773         struct lfsck_instance           *lfsck  = com->lc_lfsck;
1774         /* The child and its name may be on different MDTs. */
1775         struct dt_device                *dev    = lfsck->li_next;
1776         const char                      *name   = cname->ln_name;
1777         struct dt_object                *pobj   = NULL;
1778         struct dt_object                *cobj   = NULL;
1779         struct lfsck_lock_handle        *pllh   = &info->lti_llh;
1780         struct lustre_handle             clh    = { 0 };
1781         struct linkea_data               ldata  = { NULL };
1782         struct thandle                  *th     = NULL;
1783         bool                             exist  = true;
1784         int                              rc     = 0;
1785         ENTRY;
1786
1787         /* @parent/@child may be based on lfsck->li_bottom,
1788          * but here we need the object based on the lfsck->li_next. */
1789
1790         pobj = lfsck_object_locate(dev, parent);
1791         if (IS_ERR(pobj))
1792                 GOTO(log, rc = PTR_ERR(pobj));
1793
1794         if (unlikely(!dt_try_as_dir(env, pobj)))
1795                 GOTO(log, rc = -ENOTDIR);
1796
1797         rc = lfsck_lock(env, lfsck, parent, name, pllh,
1798                         MDS_INODELOCK_UPDATE, LCK_PW);
1799         if (rc != 0)
1800                 GOTO(log, rc);
1801
1802         if (!fid_is_sane(cfid)) {
1803                 exist = false;
1804                 goto replace;
1805         }
1806
1807         cobj = lfsck_object_find_by_dev(env, dev, cfid);
1808         if (IS_ERR(cobj)) {
1809                 rc = PTR_ERR(cobj);
1810                 if (rc == -ENOENT) {
1811                         exist = false;
1812                         goto replace;
1813                 }
1814
1815                 GOTO(log, rc);
1816         }
1817
1818         if (!dt_object_exists(cobj)) {
1819                 exist = false;
1820                 goto replace;
1821         }
1822
1823         rc = dt_lookup(env, pobj, (struct dt_rec *)&tfid,
1824                        (const struct dt_key *)name, BYPASS_CAPA);
1825         if (rc == -ENOENT) {
1826                 exist = false;
1827                 goto replace;
1828         }
1829
1830         if (rc != 0)
1831                 GOTO(log, rc);
1832
1833         /* Someone changed the name entry, cannot replace it. */
1834         if (!lu_fid_eq(cfid, &tfid))
1835                 GOTO(log, rc = 0);
1836
1837         /* lock the object to be destroyed. */
1838         rc = lfsck_ibits_lock(env, lfsck, cobj, &clh,
1839                               MDS_INODELOCK_UPDATE |
1840                               MDS_INODELOCK_UPDATE | MDS_INODELOCK_XATTR,
1841                               LCK_EX);
1842         if (rc != 0)
1843                 GOTO(log, rc);
1844
1845         if (unlikely(lfsck_is_dead_obj(cobj))) {
1846                 exist = false;
1847                 goto replace;
1848         }
1849
1850         rc = dt_attr_get(env, cobj, la, BYPASS_CAPA);
1851         if (rc != 0)
1852                 GOTO(log, rc);
1853
1854         /* The object has been modified by other(s), or it is not created by
1855          * LFSCK, the two cases are indistinguishable. So cannot replace it. */
1856         if (la->la_ctime != 0)
1857                 GOTO(log, rc);
1858
1859         if (S_ISREG(la->la_mode)) {
1860                 rc = dt_xattr_get(env, cobj, &LU_BUF_NULL, XATTR_NAME_LOV,
1861                                   BYPASS_CAPA);
1862                 /* If someone has created related OST-object(s),
1863                  * then keep it. */
1864                 if ((rc > 0) || (rc < 0 && rc != -ENODATA))
1865                         GOTO(log, rc = (rc > 0 ? 0 : rc));
1866         }
1867
1868 replace:
1869         dt_read_lock(env, child, 0);
1870         rc = lfsck_links_read2(env, child, &ldata);
1871         dt_read_unlock(env, child);
1872
1873         /* Someone changed the child, no need to replace. */
1874         if (rc == -ENODATA)
1875                 GOTO(log, rc = 0);
1876
1877         if (rc != 0)
1878                 GOTO(log, rc);
1879
1880         rc = linkea_links_find(&ldata, cname, lfsck_dto2fid(pobj));
1881         /* Someone moved the child, no need to replace. */
1882         if (rc != 0)
1883                 GOTO(log, rc = 0);
1884
1885         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1886                 GOTO(log, rc = 1);
1887
1888         th = dt_trans_create(env, dev);
1889         if (IS_ERR(th))
1890                 GOTO(log, rc = PTR_ERR(th));
1891
1892         if (exist) {
1893                 rc = dt_declare_destroy(env, cobj, th);
1894                 if (rc != 0)
1895                         GOTO(stop, rc);
1896         }
1897
1898         rc = dt_declare_delete(env, pobj, (const struct dt_key *)name, th);
1899         if (rc != 0)
1900                 GOTO(stop, rc);
1901
1902         rec->rec_type = S_IFDIR;
1903         rec->rec_fid = lfsck_dto2fid(child);
1904         rc = dt_declare_insert(env, pobj, (const struct dt_rec *)rec,
1905                                (const struct dt_key *)name, th);
1906         if (rc != 0)
1907                 GOTO(stop, rc);
1908
1909         rc = dt_trans_start_local(env, dev, th);
1910         if (rc != 0)
1911                 GOTO(stop, rc);
1912
1913         if (exist) {
1914                 rc = dt_destroy(env, cobj, th);
1915                 if (rc != 0)
1916                         GOTO(stop, rc);
1917         }
1918
1919         /* The old name entry maybe not exist. */
1920         rc = dt_delete(env, pobj, (const struct dt_key *)name, th, BYPASS_CAPA);
1921         if (rc != 0 && rc != -ENOENT)
1922                 GOTO(stop, rc);
1923
1924         rc = dt_insert(env, pobj, (const struct dt_rec *)rec,
1925                        (const struct dt_key *)name, th, BYPASS_CAPA, 1);
1926
1927         GOTO(stop, rc = (rc == 0 ? 1 : rc));
1928
1929 stop:
1930         dt_trans_stop(env, dev, th);
1931
1932 log:
1933         lfsck_ibits_unlock(&clh, LCK_EX);
1934         lfsck_unlock(pllh);
1935
1936         if (cobj != NULL && !IS_ERR(cobj))
1937                 lfsck_object_put(env, cobj);
1938
1939         CDEBUG(D_LFSCK, "%s: namespace LFSCK conditionally destroy the "
1940                "object "DFID" because of conflict with the object "DFID
1941                " under the parent "DFID" with name %s: rc = %d\n",
1942                lfsck_lfsck2name(lfsck), PFID(cfid),
1943                PFID(lfsck_dto2fid(child)), PFID(lfsck_dto2fid(parent)),
1944                name, rc);
1945
1946         return rc;
1947 }
1948
1949 /**
1950  * Overwrite the linkEA for the object with the given ldata.
1951  *
1952  * The caller should take the ldlm lock before the calling.
1953  *
1954  * \param[in] env       pointer to the thread context
1955  * \param[in] com       pointer to the lfsck component
1956  * \param[in] obj       pointer to the dt_object to be handled
1957  * \param[in] ldata     pointer to the new linkEA data
1958  *
1959  * \retval              positive number for repaired cases
1960  * \retval              0 if nothing to be repaired
1961  * \retval              negative error number on failure
1962  */
1963 int lfsck_namespace_rebuild_linkea(const struct lu_env *env,
1964                                    struct lfsck_component *com,
1965                                    struct dt_object *obj,
1966                                    struct linkea_data *ldata)
1967 {
1968         struct lfsck_instance           *lfsck  = com->lc_lfsck;
1969         struct dt_device                *dev    = lfsck_obj2dev(obj);
1970         struct thandle                  *th     = NULL;
1971         struct lu_buf                    linkea_buf;
1972         int                              rc     = 0;
1973         ENTRY;
1974
1975         th = dt_trans_create(env, dev);
1976         if (IS_ERR(th))
1977                 GOTO(log, rc = PTR_ERR(th));
1978
1979         lfsck_buf_init(&linkea_buf, ldata->ld_buf->lb_buf,
1980                        ldata->ld_leh->leh_len);
1981         rc = dt_declare_xattr_set(env, obj, &linkea_buf,
1982                                   XATTR_NAME_LINK, 0, th);
1983         if (rc != 0)
1984                 GOTO(stop, rc);
1985
1986         rc = dt_trans_start_local(env, dev, th);
1987         if (rc != 0)
1988                 GOTO(stop, rc);
1989
1990         dt_write_lock(env, obj, 0);
1991         if (unlikely(lfsck_is_dead_obj(obj)))
1992                 GOTO(unlock, rc = 0);
1993
1994         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
1995                 GOTO(unlock, rc = 1);
1996
1997         rc = dt_xattr_set(env, obj, &linkea_buf,
1998                           XATTR_NAME_LINK, 0, th, BYPASS_CAPA);
1999
2000         GOTO(unlock, rc = (rc == 0 ? 1 : rc));
2001
2002 unlock:
2003         dt_write_unlock(env, obj);
2004
2005 stop:
2006         dt_trans_stop(env, dev, th);
2007
2008 log:
2009         CDEBUG(D_LFSCK, "%s: namespace LFSCK rebuild linkEA for the "
2010                "object "DFID": rc = %d\n",
2011                lfsck_lfsck2name(lfsck), PFID(lfsck_dto2fid(obj)), rc);
2012
2013         if (rc != 0) {
2014                 struct lfsck_namespace *ns = com->lc_file_ram;
2015
2016                 ns->ln_flags |= LF_INCONSISTENT;
2017         }
2018
2019         return rc;
2020 }
2021
2022 /**
2023  * Repair invalid name entry.
2024  *
2025  * If the name entry contains invalid information, such as bad file type
2026  * or (and) corrupted object FID, then either remove the name entry or
2027  * udpate the name entry with the given (right) information.
2028  *
2029  * \param[in] env       pointer to the thread context
2030  * \param[in] com       pointer to the lfsck component
2031  * \param[in] parent    pointer to the parent directory
2032  * \param[in] child     pointer to the object referenced by the name entry
2033  * \param[in] name      the old name of the child under the parent directory
2034  * \param[in] name2     the new name of the child under the parent directory
2035  * \param[in] type      the type claimed by the name entry
2036  * \param[in] update    update the name entry if true; otherwise, remove it
2037  * \param[in] dec       decrease the parent nlink count if true
2038  *
2039  * \retval              positive number for repaired successfully
2040  * \retval              0 if nothing to be repaired
2041  * \retval              negative error number on failure
2042  */
2043 int lfsck_namespace_repair_dirent(const struct lu_env *env,
2044                                   struct lfsck_component *com,
2045                                   struct dt_object *parent,
2046                                   struct dt_object *child,
2047                                   const char *name, const char *name2,
2048                                   __u16 type, bool update, bool dec)
2049 {
2050         struct lfsck_thread_info        *info   = lfsck_env_info(env);
2051         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
2052         const struct lu_fid             *cfid   = lfsck_dto2fid(child);
2053         struct lu_fid                    tfid;
2054         struct lfsck_instance           *lfsck  = com->lc_lfsck;
2055         struct dt_device                *dev    = lfsck->li_next;
2056         struct thandle                  *th     = NULL;
2057         struct lfsck_lock_handle        *llh    = &info->lti_llh;
2058         struct lustre_handle             lh     = { 0 };
2059         int                              rc     = 0;
2060         ENTRY;
2061
2062         if (unlikely(!dt_try_as_dir(env, parent)))
2063                 GOTO(log, rc = -ENOTDIR);
2064
2065         if (!update || strcmp(name, name2) == 0)
2066                 rc = lfsck_lock(env, lfsck, parent, name, llh,
2067                                 MDS_INODELOCK_UPDATE, LCK_PW);
2068         else
2069                 rc = lfsck_ibits_lock(env, lfsck, parent, &lh,
2070                                       MDS_INODELOCK_UPDATE, LCK_PW);
2071         if (rc != 0)
2072                 GOTO(log, rc);
2073
2074         th = dt_trans_create(env, dev);
2075         if (IS_ERR(th))
2076                 GOTO(unlock1, rc = PTR_ERR(th));
2077
2078         rc = dt_declare_delete(env, parent, (const struct dt_key *)name, th);
2079         if (rc != 0)
2080                 GOTO(stop, rc);
2081
2082         if (update) {
2083                 rec->rec_type = lfsck_object_type(child) & S_IFMT;
2084                 rec->rec_fid = cfid;
2085                 rc = dt_declare_insert(env, parent,
2086                                        (const struct dt_rec *)rec,
2087                                        (const struct dt_key *)name2, th);
2088                 if (rc != 0)
2089                         GOTO(stop, rc);
2090         }
2091
2092         if (dec) {
2093                 rc = dt_declare_ref_del(env, parent, th);
2094                 if (rc != 0)
2095                         GOTO(stop, rc);
2096         }
2097
2098         rc = dt_trans_start_local(env, dev, th);
2099         if (rc != 0)
2100                 GOTO(stop, rc);
2101
2102         dt_write_lock(env, parent, 0);
2103         rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
2104                        (const struct dt_key *)name, BYPASS_CAPA);
2105         /* Someone has removed the bad name entry by race. */
2106         if (rc == -ENOENT)
2107                 GOTO(unlock2, rc = 0);
2108
2109         if (rc != 0)
2110                 GOTO(unlock2, rc);
2111
2112         /* Someone has removed the bad name entry and reused it for other
2113          * object by race. */
2114         if (!lu_fid_eq(&tfid, cfid))
2115                 GOTO(unlock2, rc = 0);
2116
2117         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
2118                 GOTO(unlock2, rc = 1);
2119
2120         rc = dt_delete(env, parent, (const struct dt_key *)name, th,
2121                        BYPASS_CAPA);
2122         if (rc != 0)
2123                 GOTO(unlock2, rc);
2124
2125         if (update) {
2126                 rc = dt_insert(env, parent,
2127                                (const struct dt_rec *)rec,
2128                                (const struct dt_key *)name2, th,
2129                                BYPASS_CAPA, 1);
2130                 if (rc != 0)
2131                         GOTO(unlock2, rc);
2132         }
2133
2134         if (dec) {
2135                 rc = dt_ref_del(env, parent, th);
2136                 if (rc != 0)
2137                         GOTO(unlock2, rc);
2138         }
2139
2140         GOTO(unlock2, rc = (rc == 0 ? 1 : rc));
2141
2142 unlock2:
2143         dt_write_unlock(env, parent);
2144
2145 stop:
2146         dt_trans_stop(env, dev, th);
2147
2148         /* We are not sure whether the child will become orphan or not.
2149          * Record it in the LFSCK trace file for further checking in
2150          * the second-stage scanning. */
2151         if (!update && !dec && rc == 0)
2152                 lfsck_namespace_trace_update(env, com, cfid,
2153                                              LNTF_CHECK_LINKEA, true);
2154
2155 unlock1:
2156         /* It is harmless even if unlock the unused lock_handle */
2157         lfsck_ibits_unlock(&lh, LCK_PW);
2158         lfsck_unlock(llh);
2159
2160 log:
2161         CDEBUG(D_LFSCK, "%s: namespace LFSCK assistant found bad name "
2162                "entry for: parent "DFID", child "DFID", name %s, type "
2163                "in name entry %o, type claimed by child %o. repair it "
2164                "by %s with new name2 %s: rc = %d\n", lfsck_lfsck2name(lfsck),
2165                PFID(lfsck_dto2fid(parent)), PFID(lfsck_dto2fid(child)),
2166                name, type, update ? lfsck_object_type(child) : 0,
2167                update ? "updating" : "removing", name2, rc);
2168
2169         if (rc != 0) {
2170                 struct lfsck_namespace *ns = com->lc_file_ram;
2171
2172                 ns->ln_flags |= LF_INCONSISTENT;
2173         }
2174
2175         return rc;
2176 }
2177
2178 /**
2179  * Update the ".." name entry for the given object.
2180  *
2181  * The object's ".." is corrupted, this function will update the ".." name
2182  * entry with the given pfid, and the linkEA with the given ldata.
2183  *
2184  * The caller should take the ldlm lock before the calling.
2185  *
2186  * \param[in] env       pointer to the thread context
2187  * \param[in] com       pointer to the lfsck component
2188  * \param[in] obj       pointer to the dt_object to be handled
2189  * \param[in] pfid      the new fid for the object's ".." name entry
2190  * \param[in] cname     the name for the @obj in the parent directory
2191  *
2192  * \retval              positive number for repaired cases
2193  * \retval              0 if nothing to be repaired
2194  * \retval              negative error number on failure
2195  */
2196 static int lfsck_namespace_repair_unmatched_pairs(const struct lu_env *env,
2197                                                   struct lfsck_component *com,
2198                                                   struct dt_object *obj,
2199                                                   const struct lu_fid *pfid,
2200                                                   struct lu_name *cname)
2201 {
2202         struct lfsck_thread_info        *info   = lfsck_env_info(env);
2203         struct dt_insert_rec            *rec    = &info->lti_dt_rec;
2204         struct lfsck_instance           *lfsck  = com->lc_lfsck;
2205         struct dt_device                *dev    = lfsck_obj2dev(obj);
2206         struct thandle                  *th     = NULL;
2207         struct linkea_data               ldata  = { NULL };
2208         struct lu_buf                    linkea_buf;
2209         int                              rc     = 0;
2210         ENTRY;
2211
2212         LASSERT(!dt_object_remote(obj));
2213         LASSERT(S_ISDIR(lfsck_object_type(obj)));
2214
2215         rc = linkea_data_new(&ldata, &info->lti_big_buf);
2216         if (rc != 0)
2217                 GOTO(log, rc);
2218
2219         rc = linkea_add_buf(&ldata, cname, pfid);
2220         if (rc != 0)
2221                 GOTO(log, rc);
2222
2223         lfsck_buf_init(&linkea_buf, ldata.ld_buf->lb_buf,
2224                        ldata.ld_leh->leh_len);
2225
2226         th = dt_trans_create(env, dev);
2227         if (IS_ERR(th))
2228                 GOTO(log, rc = PTR_ERR(th));
2229
2230         rc = dt_declare_delete(env, obj, (const struct dt_key *)dotdot, th);
2231         if (rc != 0)
2232                 GOTO(stop, rc);
2233
2234         rec->rec_type = S_IFDIR;
2235         rec->rec_fid = pfid;
2236         rc = dt_declare_insert(env, obj, (const struct dt_rec *)rec,
2237                                (const struct dt_key *)dotdot, th);
2238         if (rc != 0)
2239                 GOTO(stop, rc);
2240
2241         rc = dt_declare_xattr_set(env, obj, &linkea_buf,
2242                                   XATTR_NAME_LINK, 0, th);
2243         if (rc != 0)
2244                 GOTO(stop, rc);
2245
2246         rc = dt_trans_start_local(env, dev, th);
2247         if (rc != 0)
2248                 GOTO(stop, rc);
2249
2250         dt_write_lock(env, obj, 0);
2251         if (unlikely(lfsck_is_dead_obj(obj)))
2252                 GOTO(unlock, rc = 0);
2253
2254         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
2255                 GOTO(unlock, rc = 1);
2256
2257         /* The old ".." name entry maybe not exist. */
2258         dt_delete(env, obj, (const struct dt_key *)dotdot, th,
2259                   BYPASS_CAPA);
2260
2261         rc = dt_insert(env, obj, (const struct dt_rec *)rec,
2262                        (const struct dt_key *)dotdot, th, BYPASS_CAPA, 1);
2263         if (rc != 0)
2264                 GOTO(unlock, rc);
2265
2266         rc = dt_xattr_set(env, obj, &linkea_buf,
2267                           XATTR_NAME_LINK, 0, th, BYPASS_CAPA);
2268
2269         GOTO(unlock, rc = (rc == 0 ? 1 : rc));
2270
2271 unlock:
2272         dt_write_unlock(env, obj);
2273
2274 stop:
2275         dt_trans_stop(env, dev, th);
2276
2277 log:
2278         CDEBUG(D_LFSCK, "%s: namespace LFSCK rebuild dotdot name entry for "
2279                "the object "DFID", new parent "DFID": rc = %d\n",
2280                lfsck_lfsck2name(lfsck), PFID(lfsck_dto2fid(obj)),
2281                PFID(pfid), rc);
2282
2283         if (rc != 0) {
2284                 struct lfsck_namespace *ns = com->lc_file_ram;
2285
2286                 ns->ln_flags |= LF_INCONSISTENT;
2287         }
2288
2289         return rc;
2290 }
2291
2292 /**
2293  * Handle orphan @obj during Double Scan Directory.
2294  *
2295  * Remove the @obj's current (invalid) linkEA entries, and insert
2296  * it in the directory .lustre/lost+found/MDTxxxx/ with the name:
2297  * ${FID}-${PFID}-D-${conflict_version}
2298  *
2299  * The caller should take the ldlm lock before the calling.
2300  *
2301  * \param[in] env       pointer to the thread context
2302  * \param[in] com       pointer to the lfsck component
2303  * \param[in] obj       pointer to the orphan object to be handled
2304  * \param[in] pfid      the new fid for the object's ".." name entry
2305  * \param[in,out] lh    ldlm lock handler for the given @obj
2306  * \param[out] type     to tell the caller what the inconsistency is
2307  *
2308  * \retval              positive number for repaired cases
2309  * \retval              0 if nothing to be repaired
2310  * \retval              negative error number on failure
2311  */
2312 static int
2313 lfsck_namespace_dsd_orphan(const struct lu_env *env,
2314                            struct lfsck_component *com,
2315                            struct dt_object *obj,
2316                            const struct lu_fid *pfid,
2317                            struct lustre_handle *lh,
2318                            enum lfsck_namespace_inconsistency_type *type)
2319 {
2320         struct lfsck_thread_info *info = lfsck_env_info(env);
2321         struct lfsck_namespace   *ns   = com->lc_file_ram;
2322         int                       rc;
2323         ENTRY;
2324
2325         /* Remove the unrecognized linkEA. */
2326         rc = lfsck_namespace_links_remove(env, com, obj);
2327         lfsck_ibits_unlock(lh, LCK_EX);
2328         if (rc < 0 && rc != -ENODATA)
2329                 RETURN(rc);
2330
2331         *type = LNIT_MUL_REF;
2332
2333         /* If the LFSCK is marked as LF_INCOMPLETE, then means some MDT has
2334          * ever tried to verify some remote MDT-object that resides on this
2335          * MDT, but this MDT failed to respond such request. So means there
2336          * may be some remote name entry on other MDT that references this
2337          * object with another name, so we cannot know whether this linkEA
2338          * is valid or not. So keep it there and maybe resolved when next
2339          * LFSCK run. */
2340         if (ns->ln_flags & LF_INCOMPLETE)
2341                 RETURN(0);
2342
2343         /* The unique linkEA is invalid, even if the ".." name entry may be
2344          * valid, we still cannot know via which name entry this directory
2345          * will be referenced. Then handle it as pure orphan. */
2346         snprintf(info->lti_tmpbuf, sizeof(info->lti_tmpbuf),
2347                  "-"DFID, PFID(pfid));
2348         rc = lfsck_namespace_insert_orphan(env, com, obj,
2349                                            info->lti_tmpbuf, "D", NULL);
2350
2351         RETURN(rc);
2352 }
2353
2354 /**
2355  * Double Scan Directory object for single linkEA entry case.
2356  *
2357  * The given @child has unique linkEA entry. If the linkEA entry is valid,
2358  * then check whether the name is in the namespace or not, if not, add the
2359  * missing name entry back to namespace. If the linkEA entry is invalid,
2360  * then remove it and insert the @child in the .lustre/lost+found/MDTxxxx/
2361  * as an orphan.
2362  *
2363  * \param[in] env       pointer to the thread context
2364  * \param[in] com       pointer to the lfsck component
2365  * \param[in] child     pointer to the directory to be double scanned
2366  * \param[in] pfid      the FID corresponding to the ".." entry
2367  * \param[in] ldata     pointer to the linkEA data for the given @child
2368  * \param[in,out] lh    ldlm lock handler for the given @child
2369  * \param[out] type     to tell the caller what the inconsistency is
2370  * \param[in] retry     if found inconsistency, but the caller does not hold
2371  *                      ldlm lock on the @child, then set @retry as true
2372  *
2373  * \retval              positive number for repaired cases
2374  * \retval              0 if nothing to be repaired
2375  * \retval              negative error number on failure
2376  */
2377 static int
2378 lfsck_namespace_dsd_single(const struct lu_env *env,
2379                            struct lfsck_component *com,
2380                            struct dt_object *child,
2381                            const struct lu_fid *pfid,
2382                            struct linkea_data *ldata,
2383                            struct lustre_handle *lh,
2384                            enum lfsck_namespace_inconsistency_type *type,
2385                            bool *retry)
2386 {
2387         struct lfsck_thread_info *info          = lfsck_env_info(env);
2388         struct lu_name           *cname         = &info->lti_name;
2389         const struct lu_fid      *cfid          = lfsck_dto2fid(child);
2390         struct lu_fid             tfid;
2391         struct lfsck_namespace   *ns            = com->lc_file_ram;
2392         struct lfsck_instance    *lfsck         = com->lc_lfsck;
2393         struct dt_object         *parent        = NULL;
2394         struct lmv_mds_md_v1     *lmv;
2395         int                       rc            = 0;
2396         ENTRY;
2397
2398         lfsck_namespace_unpack_linkea_entry(ldata, cname, &tfid, info->lti_key);
2399         /* The unique linkEA entry with bad parent will be handled as orphan. */
2400         if (!fid_is_sane(&tfid)) {
2401                 if (!lustre_handle_is_used(lh) && retry != NULL)
2402                         *retry = true;
2403                 else
2404                         rc = lfsck_namespace_dsd_orphan(env, com, child,
2405                                                         pfid, lh, type);
2406
2407                 GOTO(out, rc);
2408         }
2409
2410         parent = lfsck_object_find_bottom(env, lfsck, &tfid);
2411         if (IS_ERR(parent))
2412                 GOTO(out, rc = PTR_ERR(parent));
2413
2414         /* We trust the unique linkEA entry in spite of whether it matches the
2415          * ".." name entry or not. Because even if the linkEA entry is wrong
2416          * and the ".." name entry is right, we still cannot know via which
2417          * name entry the child will be referenced, since all known entries
2418          * have been verified during the first-stage scanning. */
2419         if (!dt_object_exists(parent)) {
2420                 /* If the LFSCK is marked as LF_INCOMPLETE, then means some MDT
2421                  * has ever tried to verify some remote MDT-object that resides
2422                  * on this MDT, but this MDT failed to respond such request. So
2423                  * means there may be some remote name entry on other MDT that
2424                  * references this object with another name, so we cannot know
2425                  * whether this linkEA is valid or not. So keep it there and
2426                  * maybe resolved when next LFSCK run. */
2427                 if (ns->ln_flags & LF_INCOMPLETE)
2428                         GOTO(out, rc = 0);
2429
2430                 if (!lustre_handle_is_used(lh) && retry != NULL) {
2431                         *retry = true;
2432
2433                         GOTO(out, rc = 0);
2434                 }
2435
2436                 lfsck_ibits_unlock(lh, LCK_EX);
2437
2438 lost_parent:
2439                 lmv = &info->lti_lmv;
2440                 rc = lfsck_read_stripe_lmv(env, child, lmv);
2441                 if (rc != 0 && rc != -ENODATA)
2442                         GOTO(out, rc);
2443
2444                 if (rc == -ENODATA || lmv->lmv_magic != LMV_MAGIC_STRIPE) {
2445                         lmv = NULL;
2446                 } else if (lfsck_shard_name_to_index(env,
2447                                         cname->ln_name, cname->ln_namelen,
2448                                         S_IFDIR, cfid) < 0) {
2449                         /* It is an invalid name entry, we
2450                          * cannot trust the parent also. */
2451                         rc = lfsck_namespace_shrink_linkea(env, com, child,
2452                                                 ldata, cname, &tfid, true);
2453                         if (rc < 0)
2454                                 GOTO(out, rc);
2455
2456                         snprintf(info->lti_tmpbuf, sizeof(info->lti_tmpbuf),
2457                                  "-"DFID, PFID(pfid));
2458                         rc = lfsck_namespace_insert_orphan(env, com, child,
2459                                                 info->lti_tmpbuf, "S", NULL);
2460
2461                         GOTO(out, rc);
2462                 }
2463
2464                 /* Create the lost parent as an orphan. */
2465                 rc = lfsck_namespace_create_orphan_dir(env, com, parent, lmv);
2466                 if (rc >= 0) {
2467                         /* Add the missing name entry to the parent. */
2468                         rc = lfsck_namespace_insert_normal(env, com, parent,
2469                                                         child, cname->ln_name);
2470                         if (unlikely(rc == -EEXIST)) {
2471                                 /* Unfortunately, someone reused the name
2472                                  * under the parent by race. So we have
2473                                  * to remove the linkEA entry from
2474                                  * current child object. It means that the
2475                                  * LFSCK cannot recover the system
2476                                  * totally back to its original status,
2477                                  * but it is necessary to make the
2478                                  * current system to be consistent. */
2479                                 rc = lfsck_namespace_shrink_linkea(env,
2480                                                 com, child, ldata,
2481                                                 cname, &tfid, true);
2482                                 if (rc >= 0) {
2483                                         snprintf(info->lti_tmpbuf,
2484                                                  sizeof(info->lti_tmpbuf),
2485                                                  "-"DFID, PFID(pfid));
2486                                         rc = lfsck_namespace_insert_orphan(env,
2487                                                 com, child, info->lti_tmpbuf,
2488                                                 "D", NULL);
2489                                 }
2490                         }
2491                 }
2492
2493                 GOTO(out, rc);
2494         }
2495
2496         /* The unique linkEA entry with bad parent will be handled as orphan. */
2497         if (unlikely(!dt_try_as_dir(env, parent))) {
2498                 if (!lustre_handle_is_used(lh) && retry != NULL)
2499                         *retry = true;
2500                 else
2501                         rc = lfsck_namespace_dsd_orphan(env, com, child,
2502                                                         pfid, lh, type);
2503
2504                 GOTO(out, rc);
2505         }
2506
2507         rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
2508                        (const struct dt_key *)cname->ln_name, BYPASS_CAPA);
2509         if (rc == -ENOENT) {
2510                 /* If the LFSCK is marked as LF_INCOMPLETE, then means some MDT
2511                  * has ever tried to verify some remote MDT-object that resides
2512                  * on this MDT, but this MDT failed to respond such request. So
2513                  * means there may be some remote name entry on other MDT that
2514                  * references this object with another name, so we cannot know
2515                  * whether this linkEA is valid or not. So keep it there and
2516                  * maybe resolved when next LFSCK run. */
2517                 if (ns->ln_flags & LF_INCOMPLETE)
2518                         GOTO(out, rc = 0);
2519
2520                 if (!lustre_handle_is_used(lh) && retry != NULL) {
2521                         *retry = true;
2522
2523                         GOTO(out, rc = 0);
2524                 }
2525
2526                 lfsck_ibits_unlock(lh, LCK_EX);
2527                 rc = lfsck_namespace_check_name(env, parent, child, cname);
2528                 if (rc == -ENOENT)
2529                         goto lost_parent;
2530
2531                 if (rc < 0)
2532                         GOTO(out, rc);
2533
2534                 /* It is an invalid name entry, drop it. */
2535                 if (unlikely(rc > 0)) {
2536                         rc = lfsck_namespace_shrink_linkea(env, com, child,
2537                                                 ldata, cname, &tfid, true);
2538                         if (rc >= 0) {
2539                                 snprintf(info->lti_tmpbuf,
2540                                          sizeof(info->lti_tmpbuf),
2541                                          "-"DFID, PFID(pfid));
2542                                 rc = lfsck_namespace_insert_orphan(env, com,
2543                                         child, info->lti_tmpbuf, "D", NULL);
2544                         }
2545
2546                         GOTO(out, rc);
2547                 }
2548
2549                 /* Add the missing name entry back to the namespace. */
2550                 rc = lfsck_namespace_insert_normal(env, com, parent, child,
2551                                                    cname->ln_name);
2552                 if (unlikely(rc == -ESTALE))
2553                         /* It may happen when the remote object has been
2554                          * removed, but the local MDT is not aware of that. */
2555                         goto lost_parent;
2556
2557                 if (unlikely(rc == -EEXIST)) {
2558                         /* Unfortunately, someone reused the name under the
2559                          * parent by race. So we have to remove the linkEA
2560                          * entry from current child object. It means that the
2561                          * LFSCK cannot recover the system totally back to
2562                          * its original status, but it is necessary to make
2563                          * the current system to be consistent.
2564                          *
2565                          * It also may be because of the LFSCK found some
2566                          * internal status of create operation. Under such
2567                          * case, nothing to be done. */
2568                         rc = lfsck_namespace_shrink_linkea_cond(env, com,
2569                                         parent, child, ldata, cname, &tfid);
2570                         if (rc >= 0) {
2571                                 snprintf(info->lti_tmpbuf,
2572                                          sizeof(info->lti_tmpbuf),
2573                                          "-"DFID, PFID(pfid));
2574                                 rc = lfsck_namespace_insert_orphan(env, com,
2575                                         child, info->lti_tmpbuf, "D", NULL);
2576                         }
2577                 }
2578
2579                 GOTO(out, rc);
2580         }
2581
2582         if (rc != 0)
2583                 GOTO(out, rc);
2584
2585         if (!lu_fid_eq(&tfid, cfid)) {
2586                 if (!lustre_handle_is_used(lh) && retry != NULL) {
2587                         *retry = true;
2588
2589                         GOTO(out, rc = 0);
2590                 }
2591
2592                 lfsck_ibits_unlock(lh, LCK_EX);
2593                 /* The name entry references another MDT-object that
2594                  * may be created by the LFSCK for repairing dangling
2595                  * name entry. Try to replace it. */
2596                 rc = lfsck_namespace_replace_cond(env, com, parent, child,
2597                                                   &tfid, cname);
2598                 if (rc == 0)
2599                         rc = lfsck_namespace_dsd_orphan(env, com, child,
2600                                                         pfid, lh, type);
2601
2602                 GOTO(out, rc);
2603         }
2604
2605         if (fid_is_zero(pfid))
2606                 GOTO(out, rc = 0);
2607
2608         /* The ".." name entry is wrong, update it. */
2609         if (!lu_fid_eq(pfid, lfsck_dto2fid(parent))) {
2610                 if (!lustre_handle_is_used(lh) && retry != NULL) {
2611                         *retry = true;
2612
2613                         GOTO(out, rc = 0);
2614                 }
2615
2616                 *type = LNIT_UNMATCHED_PAIRS;
2617                 rc = lfsck_namespace_repair_unmatched_pairs(env, com, child,
2618                                                 lfsck_dto2fid(parent), cname);
2619         }
2620
2621         GOTO(out, rc);
2622
2623 out:
2624         if (parent != NULL && !IS_ERR(parent))
2625                 lfsck_object_put(env, parent);
2626
2627         return rc;
2628 }
2629
2630 /**
2631  * Double Scan Directory object for multiple linkEA entries case.
2632  *
2633  * The given @child has multiple linkEA entries. There is at most one linkEA
2634  * entry will be valid, all the others will be removed. Firstly, the function
2635  * will try to find out the linkEA entry for which the name entry exists under
2636  * the given parent (@pfid). If there is no linkEA entry that matches the given
2637  * ".." name entry, then tries to find out the first linkEA entry that both the
2638  * parent and the name entry exist to rebuild a new ".." name entry.
2639  *
2640  * \param[in] env       pointer to the thread context
2641  * \param[in] com       pointer to the lfsck component
2642  * \param[in] child     pointer to the directory to be double scanned
2643  * \param[in] pfid      the FID corresponding to the ".." entry
2644  * \param[in] ldata     pointer to the linkEA data for the given @child
2645  * \param[in,out] lh    ldlm lock handler for the given @child
2646  * \param[out] type     to tell the caller what the inconsistency is
2647  * \param[in] lpf       true if the ".." entry is under lost+found/MDTxxxx/
2648  *
2649  * \retval              positive number for repaired cases
2650  * \retval              0 if nothing to be repaired
2651  * \retval              negative error number on failure
2652  */
2653 static int
2654 lfsck_namespace_dsd_multiple(const struct lu_env *env,
2655                              struct lfsck_component *com,
2656                              struct dt_object *child,
2657                              const struct lu_fid *pfid,
2658                              struct linkea_data *ldata,
2659                              struct lustre_handle *lh,
2660                              enum lfsck_namespace_inconsistency_type *type,
2661                              bool lpf)
2662 {
2663         struct lfsck_thread_info *info          = lfsck_env_info(env);
2664         struct lu_name           *cname         = &info->lti_name;
2665         const struct lu_fid      *cfid          = lfsck_dto2fid(child);
2666         struct lu_fid            *pfid2         = &info->lti_fid3;
2667         struct lu_fid             tfid;
2668         struct lfsck_namespace   *ns            = com->lc_file_ram;
2669         struct lfsck_instance    *lfsck         = com->lc_lfsck;
2670         struct lfsck_bookmark    *bk            = &lfsck->li_bookmark_ram;
2671         struct dt_object         *parent        = NULL;
2672         struct linkea_data        ldata_new     = { NULL };
2673         int                       dirent_count  = 0;
2674         int                       linkea_count  = 0;
2675         int                       rc            = 0;
2676         bool                      once          = true;
2677         ENTRY;
2678
2679 again:
2680         while (ldata->ld_lee != NULL) {
2681                 lfsck_namespace_unpack_linkea_entry(ldata, cname, &tfid,
2682                                                     info->lti_key);
2683                 /* Drop repeated linkEA entries. */
2684                 lfsck_namespace_filter_linkea_entry(ldata, cname, &tfid, true);
2685                 /* Drop invalid linkEA entry. */
2686                 if (!fid_is_sane(&tfid)) {
2687                         linkea_del_buf(ldata, cname);
2688                         linkea_count++;
2689                         continue;
2690                 }
2691
2692                 /* If current dotdot is the .lustre/lost+found/MDTxxxx/,
2693                  * then it is possible that: the directry object has ever
2694                  * been lost, but its name entry was there. In the former
2695                  * LFSCK run, during the first-stage scanning, the LFSCK
2696                  * found the dangling name entry, but it did not recreate
2697                  * the lost object, and when moved to the second-stage
2698                  * scanning, some children objects of the lost directory
2699                  * object were found, then the LFSCK recreated such lost
2700                  * directory object as an orphan.
2701                  *
2702                  * When the LFSCK runs again, if the dangling name is still
2703                  * there, the LFSCK should move the orphan directory object
2704                  * back to the normal namespace. */
2705                 if (!lpf && !lu_fid_eq(pfid, &tfid) && once) {
2706                         linkea_next_entry(ldata);
2707                         continue;
2708                 }
2709
2710                 parent = lfsck_object_find_bottom(env, lfsck, &tfid);
2711                 if (IS_ERR(parent))
2712                         RETURN(PTR_ERR(parent));
2713
2714                 if (!dt_object_exists(parent)) {
2715                         lfsck_object_put(env, parent);
2716                         if (ldata->ld_leh->leh_reccount > 1) {
2717                                 /* If it is NOT the last linkEA entry, then
2718                                  * there is still other chance to make the
2719                                  * child to be visible via other parent, then
2720                                  * remove this linkEA entry. */
2721                                 linkea_del_buf(ldata, cname);
2722                                 linkea_count++;
2723                                 continue;
2724                         }
2725
2726                         break;
2727                 }
2728
2729                 /* The linkEA entry with bad parent will be removed. */
2730                 if (unlikely(!dt_try_as_dir(env, parent))) {
2731                         lfsck_object_put(env, parent);
2732                         linkea_del_buf(ldata, cname);
2733                         linkea_count++;
2734                         continue;
2735                 }
2736
2737                 rc = dt_lookup(env, parent, (struct dt_rec *)&tfid,
2738                                (const struct dt_key *)cname->ln_name,
2739                                BYPASS_CAPA);
2740                 *pfid2 = *lfsck_dto2fid(parent);
2741                 if (rc == -ENOENT) {
2742                         lfsck_object_put(env, parent);
2743                         linkea_next_entry(ldata);
2744                         continue;
2745                 }
2746
2747                 if (rc != 0) {
2748                         lfsck_object_put(env, parent);
2749
2750                         RETURN(rc);
2751                 }
2752
2753                 if (lu_fid_eq(&tfid, cfid)) {
2754                         lfsck_object_put(env, parent);
2755                         if (!lu_fid_eq(pfid, pfid2)) {
2756                                 *type = LNIT_UNMATCHED_PAIRS;
2757                                 rc = lfsck_namespace_repair_unmatched_pairs(env,
2758                                                 com, child, pfid2, cname);
2759
2760                                 RETURN(rc);
2761                         }
2762
2763 rebuild:
2764                         /* It is the most common case that we find the
2765                          * name entry corresponding to the linkEA entry
2766                          * that matches the ".." name entry. */
2767                         rc = linkea_data_new(&ldata_new, &info->lti_big_buf);
2768                         if (rc != 0)
2769                                 RETURN(rc);
2770
2771                         rc = linkea_add_buf(&ldata_new, cname, pfid2);
2772                         if (rc != 0)
2773                                 RETURN(rc);
2774
2775                         rc = lfsck_namespace_rebuild_linkea(env, com, child,
2776                                                             &ldata_new);
2777                         if (rc < 0)
2778                                 RETURN(rc);
2779
2780                         linkea_del_buf(ldata, cname);
2781                         linkea_count++;
2782                         linkea_first_entry(ldata);
2783                         /* There may be some invalid dangling name entries under
2784                          * other parent directories, remove all of them. */
2785                         while (ldata->ld_lee != NULL) {
2786                                 lfsck_namespace_unpack_linkea_entry(ldata,
2787                                                 cname, &tfid, info->lti_key);
2788                                 if (!fid_is_sane(&tfid))
2789                                         goto next;
2790
2791                                 parent = lfsck_object_find_bottom(env, lfsck,
2792                                                                   &tfid);
2793                                 if (IS_ERR(parent)) {
2794                                         rc = PTR_ERR(parent);
2795                                         if (rc != -ENOENT &&
2796                                             bk->lb_param & LPF_FAILOUT)
2797                                                 RETURN(rc);
2798
2799                                         goto next;
2800                                 }
2801
2802                                 if (!dt_object_exists(parent)) {
2803                                         lfsck_object_put(env, parent);
2804                                         goto next;
2805                                 }
2806
2807                                 rc = lfsck_namespace_repair_dirent(env, com,
2808                                         parent, child, cname->ln_name,
2809                                         cname->ln_name, S_IFDIR, false, true);
2810                                 lfsck_object_put(env, parent);
2811                                 if (rc < 0) {
2812                                         if (bk->lb_param & LPF_FAILOUT)
2813                                                 RETURN(rc);
2814
2815                                         goto next;
2816                                 }
2817
2818                                 dirent_count += rc;
2819
2820 next:
2821                                 linkea_del_buf(ldata, cname);
2822                         }
2823
2824                         ns->ln_dirent_repaired += dirent_count;
2825
2826                         RETURN(rc);
2827                 }
2828
2829                 lfsck_ibits_unlock(lh, LCK_EX);
2830                 /* The name entry references another MDT-object that may be
2831                  * created by the LFSCK for repairing dangling name entry.
2832                  * Try to replace it. */
2833                 rc = lfsck_namespace_replace_cond(env, com, parent, child,
2834                                                   &tfid, cname);
2835                 lfsck_object_put(env, parent);
2836                 if (rc < 0)
2837                         RETURN(rc);
2838
2839                 if (rc > 0)
2840                         goto rebuild;
2841
2842                 linkea_del_buf(ldata, cname);
2843         }
2844
2845         linkea_first_entry(ldata);
2846         if (ldata->ld_leh->leh_reccount == 1) {
2847                 rc = lfsck_namespace_dsd_single(env, com, child, pfid, ldata,
2848                                                 lh, type, NULL);
2849
2850                 if (rc == 0 && fid_is_zero(pfid) && linkea_count > 0)
2851                         rc = lfsck_namespace_rebuild_linkea(env, com, child,
2852                                                             ldata);
2853
2854                 RETURN(rc);
2855         }
2856
2857         /* All linkEA entries are invalid and removed, then handle the @child
2858          * as an orphan.*/
2859         if (ldata->ld_leh->leh_reccount == 0) {
2860                 rc = lfsck_namespace_dsd_orphan(env, com, child, pfid, lh,
2861                                                 type);
2862
2863                 RETURN(rc);
2864         }
2865
2866         /* If the dangling name entry for the orphan directory object has
2867          * been remvoed, then just check whether the directory object is
2868          * still under the .lustre/lost+found/MDTxxxx/ or not. */
2869         if (lpf) {
2870                 lpf = false;
2871                 goto again;
2872         }
2873
2874         /* There is no linkEA entry that matches the ".." name entry. Find
2875          * the first linkEA entry that both parent and name entry exist to
2876          * rebuild a new ".." name entry. */
2877         if (once) {
2878                 once = false;
2879                 goto again;
2880         }
2881
2882         RETURN(rc);
2883 }
2884
2885 /**
2886  * Repair the object's nlink attribute.
2887  *
2888  * If all the known name entries have been verified, then the object's hard
2889  * link attribute should match the object's linkEA entries count unless the
2890  * object's has too much hard link to be recorded in the linkEA. Such cases
2891  * should have been marked in the LFSCK trace file. Otherwise, trust the
2892  * linkEA to update the object's nlink attribute.
2893  *
2894  * \param[in] env       pointer to the thread context
2895  * \param[in] com       pointer to the lfsck component
2896  * \param[in] obj       pointer to the dt_object to be handled
2897  * \param[in,out] la    pointer to buffer to object's attribute before
2898  *                      and after the repairing
2899  *
2900  * \retval              positive number for repaired cases
2901  * \retval              0 if nothing to be repaired
2902  * \retval              negative error number on failure
2903  */
2904 static int lfsck_namespace_repair_nlink(const struct lu_env *env,
2905                                         struct lfsck_component *com,
2906                                         struct dt_object *obj,
2907                                         struct lu_attr *la)
2908 {
2909         struct lfsck_thread_info        *info   = lfsck_env_info(env);
2910         struct lu_fid                   *tfid   = &info->lti_fid3;
2911         struct lfsck_namespace          *ns     = com->lc_file_ram;
2912         struct lfsck_instance           *lfsck  = com->lc_lfsck;
2913         struct dt_device                *dev    = lfsck_obj2dev(obj);
2914         const struct lu_fid             *cfid   = lfsck_dto2fid(obj);
2915         struct thandle                  *th     = NULL;
2916         struct linkea_data               ldata  = { NULL };
2917         struct lustre_handle             lh     = { 0 };
2918         __u32                            old    = la->la_nlink;
2919         int                              idx;
2920         int                              rc     = 0;
2921         __u8                             flags;
2922         ENTRY;
2923
2924         LASSERT(!dt_object_remote(obj));
2925         LASSERT(S_ISREG(lfsck_object_type(obj)));
2926
2927         rc = lfsck_ibits_lock(env, lfsck, obj, &lh,
2928                               MDS_INODELOCK_UPDATE, LCK_PW);
2929         if (rc != 0)
2930                 GOTO(log, rc);
2931
2932         th = dt_trans_create(env, dev);
2933         if (IS_ERR(th))
2934                 GOTO(log, rc = PTR_ERR(th));
2935
2936         la->la_valid = LA_NLINK;
2937         rc = dt_declare_attr_set(env, obj, la, th);
2938         if (rc != 0)
2939                 GOTO(stop, rc);
2940
2941         rc = dt_trans_start_local(env, dev, th);
2942         if (rc != 0)
2943                 GOTO(stop, rc);
2944
2945         dt_write_lock(env, obj, 0);
2946         /* If the LFSCK is marked as LF_INCOMPLETE, then means some MDT has
2947          * ever tried to verify some remote MDT-object that resides on this
2948          * MDT, but this MDT failed to respond such request. So means there
2949          * may be some remote name entry on other MDT that references this
2950          * object with another name, so we cannot know whether this linkEA
2951          * is valid or not. So keep it there and maybe resolved when next
2952          * LFSCK run. */
2953         if (ns->ln_flags & LF_INCOMPLETE)
2954                 GOTO(unlock, rc = 0);
2955
2956         fid_cpu_to_be(tfid, cfid);
2957         idx = lfsck_sub_trace_file_fid2idx(cfid);
2958         rc = dt_lookup(env, com->lc_sub_trace_objs[idx].lsto_obj,
2959                        (struct dt_rec *)&flags, (const struct dt_key *)tfid,
2960                        BYPASS_CAPA);
2961         if (rc != 0)
2962                 GOTO(unlock, rc);
2963
2964         if (flags & LNTF_SKIP_NLINK)
2965                 GOTO(unlock, rc = 0);
2966
2967         rc = dt_attr_get(env, obj, la, BYPASS_CAPA);
2968         if (rc != 0)
2969                 GOTO(unlock, rc = (rc == -ENOENT ? 0 : rc));
2970
2971         rc = lfsck_links_read2(env, obj, &ldata);
2972         if (rc != 0)
2973                 GOTO(unlock, rc = (rc == -ENODATA ? 0 : rc));
2974
2975         if (la->la_nlink == ldata.ld_leh->leh_reccount ||
2976             unlikely(la->la_nlink == 0))
2977                 GOTO(unlock, rc = 0);
2978
2979         la->la_nlink = ldata.ld_leh->leh_reccount;
2980         if (lfsck->li_bookmark_ram.lb_param & LPF_DRYRUN)
2981                 GOTO(unlock, rc = 1);
2982
2983         rc = dt_attr_set(env, obj, la, th, BYPASS_CAPA);
2984
2985         GOTO(unlock, rc = (rc == 0 ? 1 : rc));
2986
2987 unlock:
2988         dt_write_unlock(env, obj);
2989
2990 stop:
2991         dt_trans_stop(env, dev, th);
2992
2993 log:
2994         lfsck_ibits_unlock(&lh, LCK_PW);
2995         CDEBUG(D_LFSCK, "%s: namespace LFSCK repaired the object "DFID"'s "
2996                "nlink count from %u to %u: rc = %d\n",
2997                lfsck_lfsck2name(lfsck), PFID(cfid), old, la->la_nlink, rc);
2998
2999         if (rc != 0)
3000                 ns->ln_flags |= LF_INCONSISTENT;
3001
3002         return rc;
3003 }
3004
3005 /**
3006  * Double scan the directory object for namespace LFSCK.
3007  *
3008  * This function will verify the <parent, child> pairs in the namespace tree:
3009  * the parent references the child via some name entry that should be in the
3010  * child's linkEA entry, the child should back references the parent via its
3011  * ".." name entry.
3012  *
3013  * The LFSCK will scan every linkEA entry in turn until find out the first
3014  * matched pairs. If found, then all other linkEA entries will be dropped.
3015  * If all the linkEA entries cannot match the ".." name entry, then there
3016  * are serveral possible cases:
3017  *
3018  * 1) If there is only one linkEA entry, then trust it as long as the PFID
3019  *    in the linkEA entry is valid.
3020  *
3021  * 2) If there are multiple linkEA entries, then try to find the linkEA
3022  *    that matches the ".." name entry. If found, then all other entries
3023  *    are invalid; otherwise, it is quite possible that the ".." name entry
3024  *    is corrupted. Under such case, the LFSCK will rebuild the ".." name
3025  *    entry according to the first valid linkEA entry (both the parent and
3026  *    the name entry should exist).
3027  *
3028  * 3) If the directory object has no (valid) linkEA entry, then the
3029  *    directory object will be handled as pure orphan and inserted
3030  *    in the .lustre/lost+found/MDTxxxx/ with the name:
3031  *    ${self_FID}-${PFID}-D-${conflict_version}
3032  *
3033  * \param[in] env       pointer to the thread context
3034  * \param[in] com       pointer to the lfsck component
3035  * \param[in] child     pointer to the directory object to be handled
3036  * \param[in] flags     to indicate the specical checking on the @child
3037  *
3038  * \retval              positive number for repaired cases
3039  * \retval              0 if nothing to be repaired
3040  * \retval              negative error number on failure
3041  */
3042 static int lfsck_namespace_double_scan_dir(const struct lu_env *env,
3043                                            struct lfsck_component *com,
3044                                            struct dt_object *child, __u8 flags)
3045 {
3046         struct lfsck_thread_info *info          = lfsck_env_info(env);
3047         const struct lu_fid      *cfid          = lfsck_dto2fid(child);
3048         struct lu_fid            *pfid          = &info->lti_fid2;
3049         struct lfsck_namespace   *ns            = com->lc_file_ram;
3050         struct lfsck_instance    *lfsck         = com->lc_lfsck;
3051         struct lustre_handle      lh            = { 0 };
3052         struct linkea_data        ldata         = { NULL };
3053         bool                      unknown       = false;
3054         bool                      lpf           = false;
3055         bool                      retry         = false;
3056         enum lfsck_namespace_inconsistency_type type = LNIT_BAD_LINKEA;
3057         int                       rc            = 0;
3058         ENTRY;
3059
3060         LASSERT(!dt_object_remote(child));
3061
3062         if (flags & LNTF_UNCERTAIN_LMV) {
3063                 if (flags & LNTF_RECHECK_NAME_HASH) {
3064                         rc = lfsck_namespace_scan_shard(env, com, child);
3065                         if (rc < 0)
3066                                 RETURN(rc);
3067
3068                         ns->ln_striped_shards_scanned++;
3069                 } else {
3070                         ns->ln_striped_shards_skipped++;
3071                 }
3072         }
3073
3074         flags &= ~(LNTF_RECHECK_NAME_HASH | LNTF_UNCERTAIN_LMV);
3075         if (flags == 0)
3076                 RETURN(0);
3077
3078         if (flags & (LNTF_CHECK_LINKEA | LNTF_CHECK_PARENT) &&
3079             !(lfsck->li_bookmark_ram.lb_param & LPF_ALL_TGT)) {
3080                 CDEBUG(D_LFSCK, "%s: some MDT(s) maybe NOT take part in the"
3081                        "the namespace LFSCK, then the LFSCK cannot guarantee"
3082                        "all the name entries have been verified in first-stage"
3083                        "scanning. So have to skip orphan related handling for"
3084                        "the directory object "DFID" with remote name entry\n",
3085                        lfsck_lfsck2name(lfsck), PFID(cfid));
3086
3087                 RETURN(0);
3088         }
3089
3090         if (unlikely(!dt_try_as_dir(env, child)))
3091                 GOTO(out, rc = -ENOTDIR);
3092
3093         /* We only take ldlm lock on the @child when required. When the
3094          * logic comes here for the first time, it is always false. */
3095         if (0) {
3096
3097 lock:
3098                 rc = lfsck_ibits_lock(env, lfsck, child, &lh,
3099                                       MDS_INODELOCK_UPDATE |
3100                                       MDS_INODELOCK_XATTR, LCK_EX);
3101                 if (rc != 0)
3102                         GOTO(out, rc);
3103         }
3104
3105         dt_read_lock(env, child, 0);
3106         if (unlikely(lfsck_is_dead_obj(child))) {
3107                 dt_read_unlock(env, child);
3108
3109                 GOTO(out, rc = 0);
3110         }
3111
3112         rc = dt_lookup(env, child, (struct dt_rec *)pfid,
3113                        (const struct dt_key *)dotdot, BYPASS_CAPA);
3114         if (rc != 0) {
3115                 if (rc != -ENOENT && rc != -ENODATA && rc != -EINVAL) {
3116                         dt_read_unlock(env, child);
3117
3118                         GOTO(out, rc);
3119                 }
3120
3121                 if (!lustre_handle_is_used(&lh)) {
3122                         dt_read_unlock(env, child);
3123                         goto lock;
3124                 }
3125
3126                 fid_zero(pfid);
3127         } else if (lfsck->li_lpf_obj != NULL &&
3128                    lu_fid_eq(pfid, lfsck_dto2fid(lfsck->li_lpf_obj))) {
3129                 lpf = true;
3130         } else if (unlikely(!fid_is_sane(pfid))) {
3131                 fid_zero(pfid);
3132         }
3133
3134         rc = lfsck_links_read(env, child, &ldata);
3135         dt_read_unlock(env, child);
3136         if (rc != 0) {
3137                 if (rc != -ENODATA && rc != -EINVAL)
3138                         GOTO(out, rc);
3139
3140                 if (!lustre_handle_is_used(&lh))
3141                         goto lock;
3142
3143                 if (rc == -EINVAL && !fid_is_zero(pfid)) {
3144                         /* Remove the corrupted linkEA. */
3145                         rc = lfsck_namespace_links_remove(env, com, child);
3146                         if (rc == 0)
3147                                 /* Here, because of the crashed linkEA, we
3148                                  * cannot know whether there is some parent
3149                                  * that references the child directory via
3150                                  * some name entry or not. So keep it there,
3151                                  * when the LFSCK run next time, if there is
3152                                  * some parent that references this object,
3153                                  * then the LFSCK can rebuild the linkEA;
3154                                  * otherwise, this object will be handled
3155                                  * as orphan as above. */
3156                                 unknown = true;
3157                 } else {
3158                         /* 1. If we have neither ".." nor linkEA,
3159                          *    then it is an orphan.
3160                          *
3161                          * 2. If we only have the ".." name entry,
3162                          *    but no parent references this child
3163                          *    directory, then handle it as orphan. */
3164                         lfsck_ibits_unlock(&lh, LCK_EX);
3165                         type = LNIT_MUL_REF;
3166
3167                         /* If the LFSCK is marked as LF_INCOMPLETE,
3168                          * then means some MDT has ever tried to
3169                          * verify some remote MDT-object that resides
3170                          * on this MDT, but this MDT failed to respond
3171                          * such request. So means there may be some
3172                          * remote name entry on other MDT that
3173                          * references this object with another name,
3174                          * so we cannot know whether this linkEA is
3175                          * valid or not. So keep it there and maybe
3176                          * resolved when next LFSCK run. */
3177                         if (ns->ln_flags & LF_INCOMPLETE)
3178                                 GOTO(out, rc = 0);
3179
3180                         snprintf(info->lti_tmpbuf, sizeof(info->lti_tmpbuf),
3181                                  "-"DFID, PFID(pfid));
3182                         rc = lfsck_namespace_insert_orphan(env, com, child,
3183                                                 info->lti_tmpbuf, "D", NULL);
3184                 }
3185
3186                 GOTO(out, rc);
3187         }
3188
3189         linkea_first_entry(&ldata);
3190         /* This is the most common case: the object has unique linkEA entry. */
3191         if (ldata.ld_leh->leh_reccount == 1) {
3192                 rc = lfsck_namespace_dsd_single(env, com, child, pfid, &ldata,
3193                                                 &lh, &type, &retry);
3194                 if (retry) {
3195                         LASSERT(!lustre_handle_is_used(&lh));
3196
3197                         retry = false;
3198                         goto lock;
3199                 }
3200
3201                 GOTO(out, rc);
3202         }
3203
3204         if (!lustre_handle_is_used(&lh))
3205                 goto lock;
3206
3207         if (unlikely(ldata.ld_leh->leh_reccount == 0)) {
3208                 rc = lfsck_namespace_dsd_orphan(env, com, child, pfid, &lh,
3209                                                 &type);
3210
3211                 GOTO(out, rc);
3212         }
3213
3214         /* When we come here, the cases usually like that:
3215          * 1) The directory object has a corrupted linkEA entry. During the
3216          *    first-stage scanning, the LFSCK cannot know such corruption,
3217          *    then it appends the right linkEA entry according to the found
3218          *    name entry after the bad one.
3219          *
3220          * 2) The directory object has a right linkEA entry. During the
3221          *    first-stage scanning, the LFSCK finds some bad name entry,
3222          *    but the LFSCK cannot aware that at that time, then it adds
3223          *    the bad linkEA entry for further processing. */
3224         rc = lfsck_namespace_dsd_multiple(env, com, child, pfid, &ldata,
3225                                           &lh, &type, lpf);
3226
3227         GOTO(out, rc);
3228
3229 out:
3230         lfsck_ibits_unlock(&lh, LCK_EX);
3231         if (rc > 0) {
3232                 switch (type) {
3233                 case LNIT_BAD_LINKEA:
3234                         ns->ln_linkea_repaired++;
3235                         break;
3236                 case LNIT_UNMATCHED_PAIRS:
3237                         ns->ln_unmatched_pairs_repaired++;
3238                         break;
3239                 case LNIT_MUL_REF:
3240                         ns->ln_mul_ref_repaired++;
3241                         break;
3242                 default:
3243                         break;
3244                 }
3245         }
3246
3247         if (unknown)
3248                 ns->ln_unknown_inconsistency++;
3249
3250         return rc;
3251 }
3252
3253 /**
3254  * Double scan the MDT-object for namespace LFSCK.
3255  *
3256  * If the MDT-object contains invalid or repeated linkEA entries, then drop
3257  * those entries from the linkEA; if the linkEA becomes empty or the object
3258  * has no linkEA, then it is an orphan and will be added into the directory
3259  * .lustre/lost+found/MDTxxxx/; if the remote parent is lost, then recreate
3260  * the remote parent; if the name entry corresponding to some linkEA entry
3261  * is lost, then add the name entry back to the namespace.
3262  *
3263  * \param[in] env       pointer to the thread context
3264  * \param[in] com       pointer to the lfsck component
3265  * \param[in] child     pointer to the dt_object to be handled
3266  * \param[in] flags     some hints to indicate how the @child should be handled
3267  *
3268  * \retval              positive number for repaired cases
3269  * \retval              0 if nothing to be repaired
3270  * \retval              negative error number on failure
3271  */
3272 static int lfsck_namespace_double_scan_one(const struct lu_env *env,
3273                                            struct lfsck_component *com,
3274                                            struct dt_object *child, __u8 flags)
3275 {
3276         struct lfsck_thread_info *info     = lfsck_env_info(env);
3277         struct lu_attr           *la       = &info->lti_la;
3278         struct lu_name           *cname    = &info->lti_name;
3279         struct lu_fid            *pfid     = &info->lti_fid;
3280         struct lu_fid            *cfid     = &info->lti_fid2;
3281         struct lfsck_instance    *lfsck    = com->lc_lfsck;
3282         struct lfsck_namespace   *ns       = com->lc_file_ram;
3283         struct dt_object         *parent   = NULL;
3284         struct linkea_data        ldata    = { NULL };
3285         bool                      repaired = false;
3286         int                       count    = 0;
3287         int                       rc;
3288         ENTRY;
3289
3290         dt_read_lock(env, child, 0);
3291         if (unlikely(lfsck_is_dead_obj(child))) {
3292                 dt_read_unlock(env, child);
3293
3294                 RETURN(0);
3295         }
3296
3297         if (S_ISDIR(lfsck_object_type(child))) {
3298                 dt_read_unlock(env, child);
3299                 rc = lfsck_namespace_double_scan_dir(env, com, child, flags);
3300
3301                 RETURN(rc);
3302         }
3303
3304         rc = lfsck_links_read(env, child, &ldata);
3305         dt_read_unlock(env, child);
3306         if (rc != 0)
3307                 GOTO(out, rc);
3308
3309         linkea_first_entry(&ldata);
3310         while (ldata.ld_lee != NULL) {
3311                 lfsck_namespace_unpack_linkea_entry(&ldata, cname, pfid,
3312                                                     info->lti_key);
3313                 rc = lfsck_namespace_filter_linkea_entry(&ldata, cname, pfid,
3314                                                          false);
3315                 /* Found repeated linkEA entries */
3316                 if (rc > 0) {
3317                         rc = lfsck_namespace_shrink_linkea(env, com, child,
3318                                                 &ldata, cname, pfid, false);
3319                         if (rc < 0)
3320                                 GOTO(out, rc);
3321
3322                         if (rc == 0)
3323                                 continue;
3324
3325                         repaired = true;
3326
3327                         /* fall through */
3328                 }
3329
3330                 /* Invalid PFID in the linkEA entry. */
3331                 if (!fid_is_sane(pfid)) {
3332                         rc = lfsck_namespace_shrink_linkea(env, com, child,
3333                                                 &ldata, cname, pfid, true);
3334                         if (rc < 0)
3335                                 GOTO(out, rc);
3336
3337                         if (rc > 0)
3338                                 repaired = true;
3339
3340                         continue;
3341                 }
3342
3343                 parent = lfsck_object_find_bottom(env, lfsck, pfid);
3344                 if (IS_ERR(parent))
3345                         GOTO(out, rc = PTR_ERR(parent));
3346
3347                 if (!dt_object_exists(parent)) {
3348
3349 lost_parent:
3350                         if (ldata.ld_leh->leh_reccount > 1) {
3351                                 /* If it is NOT the last linkEA entry, then
3352                                  * there is still other chance to make the
3353                                  * child to be visible via other parent, then
3354                                  * remove this linkEA entry. */
3355                                 rc = lfsck_namespace_shrink_linkea(env, com,
3356                                         child, &ldata, cname, pfid, true);
3357                         } else {
3358                                 /* If the LFSCK is marked as LF_INCOMPLETE,
3359                                  * then means some MDT has ever tried to
3360                                  * verify some remote MDT-object that resides
3361                                  * on this MDT, but this MDT failed to respond
3362                                  * such request. So means there may be some
3363                                  * remote name entry on other MDT that
3364                                  * references this object with another name,
3365                                  * so we cannot know whether this linkEA is
3366                                  * valid or not. So keep it there and maybe
3367                                  * resolved when next LFSCK run. */
3368                                 if (ns->ln_flags & LF_INCOMPLETE) {
3369                                         lfsck_object_put(env, parent);
3370
3371                                         GOTO(out, rc = 0);
3372                                 }
3373
3374                                 /* Create the lost parent as an orphan. */
3375                                 rc = lfsck_namespace_create_orphan_dir(env, com,
3376                                                                 parent, NULL);
3377                                 if (rc < 0) {
3378                                         lfsck_object_put(env, parent);
3379
3380                                         GOTO(out, rc);
3381                                 }
3382
3383                                 if (rc > 0)
3384                                         repaired = true;
3385
3386                                 /* Add the missing name entry to the parent. */
3387                                 rc = lfsck_namespace_insert_normal(env, com,
3388                                                 parent, child, cname->ln_name);
3389                                 if (unlikely(rc == -EEXIST))
3390                                         /* Unfortunately, someone reused the
3391                                          * name under the parent by race. So we
3392                                          * have to remove the linkEA entry from
3393                                          * current child object. It means that
3394                                          * the LFSCK cannot recover the system
3395                                          * totally back to its original status,
3396                                          * but it is necessary to make the
3397                                          * current system to be consistent. */
3398                                         rc = lfsck_namespace_shrink_linkea(env,
3399                                                         com, child, &ldata,
3400                                                         cname, pfid, true);
3401                                 else
3402                                         linkea_next_entry(&ldata);
3403                         }
3404
3405                         lfsck_object_put(env, parent);
3406                         if (rc < 0)
3407                                 GOTO(out, rc);
3408
3409                         if (rc > 0)
3410                                 repaired = true;
3411
3412                         continue;
3413                 }
3414
3415                 /* The linkEA entry with bad parent will be removed. */
3416                 if (unlikely(!dt_try_as_dir(env, parent))) {
3417                         lfsck_object_put(env, parent);
3418                         rc = lfsck_namespace_shrink_linkea(env, com, child,
3419                                                 &ldata, cname, pfid, true);
3420                         if (rc < 0)
3421                                 GOTO(out, rc);
3422
3423                         if (rc > 0)
3424                                 repaired = true;
3425
3426                         continue;
3427                 }
3428
3429                 rc = dt_lookup(env, parent, (struct dt_rec *)cfid,
3430                                (const struct dt_key *)cname->ln_name,
3431                                BYPASS_CAPA);
3432                 if (rc != 0 && rc != -ENOENT) {
3433                         lfsck_object_put(env, parent);
3434
3435                         GOTO(out, rc);
3436                 }
3437
3438                 if (rc == 0) {
3439                         if (lu_fid_eq(cfid, lfsck_dto2fid(child))) {