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27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
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33 * This file is part of Lustre, http://www.lustre.org/
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36 * lustre/mdd/mdd_orphans.c
38 * Orphan handling code
40 * Author: Mike Pershin <tappro@clusterfs.com>
41 * Pravin B Shelar <pravin.shelar@sun.com>
44 #define DEBUG_SUBSYSTEM S_MDS
47 #include <obd_class.h>
48 #include <lustre_ver.h>
49 #include <obd_support.h>
50 #include <lustre_fid.h>
51 #include "mdd_internal.h"
53 const char orph_index_name[] = "PENDING";
54 const char *dotdot = "..";
61 #define ORPHAN_FILE_NAME_FORMAT "%016llx:%08x:%08x:%2x"
62 #define ORPHAN_FILE_NAME_FORMAT_18 "%llx:%08x"
64 static struct dt_key* orph_key_fill(const struct lu_env *env,
65 const struct lu_fid *lf, __u32 op)
67 char *key = mdd_env_info(env)->mti_key;
71 rc = snprintf(key, NAME_MAX + 1, ORPHAN_FILE_NAME_FORMAT,
72 (long long unsigned int)fid_seq(lf),
73 fid_oid(lf), fid_ver(lf), op);
75 return (struct dt_key*) key;
80 static struct dt_key* orph_key_fill_18(const struct lu_env *env,
81 const struct lu_fid *lf)
83 char *key = mdd_env_info(env)->mti_key;
87 rc = snprintf(key, NAME_MAX + 1, ORPHAN_FILE_NAME_FORMAT_18,
88 (unsigned long long)fid_seq(lf), fid_oid(lf));
90 return (struct dt_key*) key;
95 static inline void mdd_orphan_write_lock(const struct lu_env *env,
96 struct mdd_device *mdd)
99 struct dt_object *dor = mdd->mdd_orphans;
100 dor->do_ops->do_write_lock(env, dor, MOR_TGT_ORPHAN);
103 static inline void mdd_orphan_write_unlock(const struct lu_env *env,
104 struct mdd_device *mdd)
107 struct dt_object *dor = mdd->mdd_orphans;
108 dor->do_ops->do_write_unlock(env, dor);
111 static inline int mdd_orphan_insert_obj(const struct lu_env *env,
112 struct mdd_device *mdd,
113 struct mdd_object *obj,
117 struct dt_object *dor = mdd->mdd_orphans;
118 const struct lu_fid *lf = mdo2fid(obj);
119 struct dt_key *key = orph_key_fill(env, lf, op);
122 return dor->do_index_ops->dio_insert(env, dor,
128 static inline int mdd_orphan_delete_obj(const struct lu_env *env,
129 struct mdd_device *mdd ,
133 struct dt_object *dor = mdd->mdd_orphans;
135 return dor->do_index_ops->dio_delete(env, dor,
140 static inline void mdd_orphan_ref_add(const struct lu_env *env,
141 struct mdd_device *mdd,
144 struct dt_object *dor = mdd->mdd_orphans;
145 dor->do_ops->do_ref_add(env, dor, th);
148 static inline void mdd_orphan_ref_del(const struct lu_env *env,
149 struct mdd_device *mdd,
152 struct dt_object *dor = mdd->mdd_orphans;
153 dor->do_ops->do_ref_del(env, dor, th);
157 int orph_declare_index_insert(const struct lu_env *env,
158 struct mdd_object *obj,
159 cfs_umode_t mode, struct thandle *th)
161 struct mdd_device *mdd = mdo2mdd(&obj->mod_obj);
165 key = orph_key_fill(env, mdo2fid(obj), ORPH_OP_UNLINK);
167 rc = dt_declare_insert(env, mdd->mdd_orphans, NULL, key, th);
171 rc = mdo_declare_ref_add(env, obj, th);
178 rc = mdo_declare_ref_add(env, obj, th);
182 rc = dt_declare_ref_add(env, mdd->mdd_orphans, th);
186 rc = mdo_declare_index_delete(env, obj, dotdot, th);
190 rc = mdo_declare_index_insert(env, obj, NULL, dotdot, th);
195 static int orph_index_insert(const struct lu_env *env,
196 struct mdd_object *obj,
200 struct mdd_device *mdd = mdo2mdd(&obj->mod_obj);
201 struct dt_object *dor = mdd->mdd_orphans;
202 const struct lu_fid *lf_dor = lu_object_fid(&dor->do_lu);
203 struct dt_object *next = mdd_object_child(obj);
207 LASSERT(mdd_write_locked(env, obj) != 0);
208 LASSERT(!(obj->mod_flags & ORPHAN_OBJ));
210 mdd_orphan_write_lock(env, mdd);
212 rc = mdd_orphan_insert_obj(env, mdd, obj, op, th);
216 mdo_ref_add(env, obj, th);
217 if (!S_ISDIR(mdd_object_type(obj)))
220 mdo_ref_add(env, obj, th);
221 mdd_orphan_ref_add(env, mdd, th);
223 /* try best to fixup directory, dont return errors
225 if (!dt_try_as_dir(env, next))
227 next->do_index_ops->dio_delete(env, next,
228 (const struct dt_key *)dotdot,
231 next->do_index_ops->dio_insert(env, next,
232 (struct dt_rec *)lf_dor,
233 (const struct dt_key *)dotdot,
238 obj->mod_flags |= ORPHAN_OBJ;
240 mdd_orphan_write_unlock(env, mdd);
245 int orph_declare_index_delete(const struct lu_env *env,
246 struct mdd_object *obj,
250 struct mdd_device *mdd = mdo2mdd(&obj->mod_obj);
254 key = orph_key_fill(env, mdo2fid(obj), ORPH_OP_UNLINK);
256 rc = dt_declare_delete(env, mdd->mdd_orphans, key, th);
260 rc = mdo_declare_ref_del(env, obj, th);
264 if (S_ISDIR(mdd_object_type(obj))) {
265 rc = mdo_declare_ref_del(env, obj, th);
269 rc = dt_declare_ref_del(env, mdd->mdd_orphans, th);
275 static int orph_index_delete(const struct lu_env *env,
276 struct mdd_object *obj,
280 struct mdd_device *mdd = mdo2mdd(&obj->mod_obj);
281 struct dt_object *dor = mdd->mdd_orphans;
287 LASSERT(mdd_write_locked(env, obj) != 0);
288 LASSERT(obj->mod_flags & ORPHAN_OBJ);
289 LASSERT(obj->mod_count == 0);
293 key = orph_key_fill(env, mdo2fid(obj), op);
294 mdd_orphan_write_lock(env, mdd);
296 rc = mdd_orphan_delete_obj(env, mdd, key, th);
299 key = orph_key_fill_18(env, mdo2fid(obj));
300 rc = mdd_orphan_delete_obj(env, mdd, key, th);
304 /* lov objects will be destroyed by caller */
305 mdo_ref_del(env, obj, th);
306 if (S_ISDIR(mdd_object_type(obj))) {
307 mdo_ref_del(env, obj, th);
308 mdd_orphan_ref_del(env, mdd, th);
310 obj->mod_flags &= ~ORPHAN_OBJ;
312 CERROR("could not delete object: rc = %d\n",rc);
315 mdd_orphan_write_unlock(env, mdd);
320 static int orphan_object_destroy(const struct lu_env *env,
321 struct mdd_object *obj,
324 struct thandle *th = NULL;
325 struct mdd_device *mdd = mdo2mdd(&obj->mod_obj);
329 th = mdd_trans_create(env, mdd);
331 CERROR("Cannot get thandle\n");
335 rc = orph_declare_index_delete(env, obj, th);
339 rc = mdo_declare_destroy(env, obj, th);
343 rc = mdd_trans_start(env, mdd, th);
347 mdd_write_lock(env, obj, MOR_TGT_CHILD);
348 if (likely(obj->mod_count == 0)) {
349 mdd_orphan_write_lock(env, mdd);
350 rc = mdd_orphan_delete_obj(env, mdd, key, th);
352 mdo_ref_del(env, obj, th);
353 if (S_ISDIR(mdd_object_type(obj))) {
354 mdo_ref_del(env, obj, th);
355 mdd_orphan_ref_del(env, mdd, th);
357 rc = mdo_destroy(env, obj, th);
359 CERROR("could not delete object: rc = %d\n",rc);
360 mdd_orphan_write_unlock(env, mdd);
362 mdd_write_unlock(env, obj);
365 mdd_trans_stop(env, mdd, 0, th);
371 * Delete unused orphan with FID \a lf from PENDING directory
373 * \param mdd MDD device finishing recovery
374 * \param lf FID of file or directory to delete
375 * \param key cookie for this entry in index iterator
380 static int orph_key_test_and_del(const struct lu_env *env,
381 struct mdd_device *mdd,
385 struct mdd_object *mdo;
388 mdo = mdd_object_find(env, mdd, lf);
394 if (mdo->mod_count == 0) {
395 CDEBUG(D_HA, "Found orphan "DFID", delete it\n", PFID(lf));
396 rc = orphan_object_destroy(env, mdo, key);
397 if (rc) /* so replay-single.sh test_37 works */
398 CERROR("%s: error unlinking orphan "DFID" from "
399 "PENDING: rc = %d\n",
400 mdd2obd_dev(mdd)->obd_name, PFID(lf), rc);
402 mdd_write_lock(env, mdo, MOR_TGT_CHILD);
403 if (likely(mdo->mod_count > 0)) {
404 CDEBUG(D_HA, "Found orphan "DFID" count %d, skip it\n",
405 PFID(lf), mdo->mod_count);
406 mdo->mod_flags |= ORPHAN_OBJ;
408 mdd_write_unlock(env, mdo);
411 mdd_object_put(env, mdo);
416 * delete unreferenced files and directories in the PENDING directory
418 * Files that remain in PENDING after client->MDS recovery has completed
419 * have to be referenced (opened) by some client during recovery, or they
420 * will be deleted here (for clients that did not complete recovery).
422 * \param mdd MDD device finishing recovery
427 static int orph_index_iterate(const struct lu_env *env,
428 struct mdd_device *mdd)
430 struct dt_object *dor = mdd->mdd_orphans;
431 struct lu_dirent *ent = &mdd_env_info(env)->mti_ent;
432 const struct dt_it_ops *iops;
440 /* In recovery phase, do not need for any lock here */
441 iops = &dor->do_index_ops->dio_it;
442 it = iops->init(env, dor, LUDA_64BITHASH, BYPASS_CAPA);
445 CERROR("%s: cannot clean PENDING: rc = %d\n",
446 mdd2obd_dev(mdd)->obd_name, rc);
450 rc = iops->load(env, it, 0);
454 CERROR("%s: error loading iterator to clean PENDING\n",
455 mdd2obd_dev(mdd)->obd_name);
456 /* Index contains no zero key? */
457 GOTO(out_put, rc = -EIO);
461 key_sz = iops->key_size(env, it);
462 /* filter out "." and ".." entries from PENDING dir. */
466 rc = iops->rec(env, it, (struct dt_rec *)ent, LUDA_64BITHASH);
468 CERROR("%s: fail to get FID for orphan it: rc = %d\n",
469 mdd2obd_dev(mdd)->obd_name, rc);
473 fid_le_to_cpu(&fid, &ent->lde_fid);
474 if (!fid_is_sane(&fid)) {
475 CERROR("%s: bad FID "DFID" cleaning PENDING\n",
476 mdd2obd_dev(mdd)->obd_name, PFID(&fid));
480 /* kill orphan object */
481 cookie = iops->store(env, it);
483 rc = orph_key_test_and_del(env, mdd, &fid,
484 (struct dt_key *)ent->lde_name);
486 /* after index delete reset iterator */
488 rc = iops->get(env, it, (const void *)"");
490 rc = iops->load(env, it, cookie);
492 rc = iops->next(env, it);
495 GOTO(out_put, rc = 0);
505 * open the PENDING directory for device \a mdd
507 * The PENDING directory persistently tracks files and directories that were
508 * unlinked from the namespace (nlink == 0) but are still held open by clients.
509 * Those inodes shouldn't be deleted if the MDS crashes, because the clients
510 * would not be able to recover and reopen those files. Instead, these inodes
511 * are linked into the PENDING directory on disk, and only deleted if all
512 * clients close them, or the MDS finishes client recovery without any client
513 * reopening them (i.e. former clients didn't join recovery).
514 * \param d mdd device being started.
517 * \retval -ve index operation error.
520 int orph_index_init(const struct lu_env *env, struct mdd_device *mdd)
528 /* create PENDING dir */
530 rc = mdd_local_file_create(env, mdd, &mdd->mdd_local_root_fid,
531 orph_index_name, S_IFDIR | S_IRUGO |
532 S_IWUSR | S_IXUGO, &fid);
536 d = dt_locate(env, mdd->mdd_child, &fid);
539 LASSERT(lu_object_exists(&d->do_lu));
540 if (!dt_try_as_dir(env, d)) {
541 CERROR("%s: \"%s\" is not an index: rc = %d\n",
542 mdd2obd_dev(mdd)->obd_name, orph_index_name, rc);
543 lu_object_put(env, &d->do_lu);
546 mdd->mdd_orphans = d;
550 void orph_index_fini(const struct lu_env *env, struct mdd_device *mdd)
553 if (mdd->mdd_orphans != NULL) {
554 lu_object_put(env, &mdd->mdd_orphans->do_lu);
555 mdd->mdd_orphans = NULL;
561 * Iterate orphan index to cleanup orphan objects after recovery is done.
562 * \param d mdd device in recovery.
564 int __mdd_orphan_cleanup(const struct lu_env *env, struct mdd_device *d)
566 return orph_index_iterate(env, d);
570 * add an orphan \a obj to the orphan index.
571 * \param obj file or directory.
572 * \param th transaction for index insert.
574 * \pre obj nlink == 0 && obj->mod_count != 0
577 * \retval -ve index operation error.
579 int __mdd_orphan_add(const struct lu_env *env,
580 struct mdd_object *obj, struct thandle *th)
582 return orph_index_insert(env, obj, ORPH_OP_UNLINK, th);
586 * delete an orphan \a obj from orphan index.
587 * \param obj file or directory.
588 * \param th transaction for index deletion and object destruction.
590 * \pre obj->mod_count == 0 && ORPHAN_OBJ is set for obj.
593 * \retval -ve index operation error.
595 int __mdd_orphan_del(const struct lu_env *env,
596 struct mdd_object *obj, struct thandle *th)
598 return orph_index_delete(env, obj, ORPH_OP_UNLINK, th);