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13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
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17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2012, 2016, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
33 * lustre/obdclass/llog_osd.c
35 * Low level llog routines on top of OSD API
37 * This file provides set of methods for llog operations on top of
38 * dt_device. It contains all supported llog_operations interfaces and
39 * supplimental functions.
41 * Author: Alexey Zhuravlev <alexey.zhuravlev@intel.com>
42 * Author: Mikhail Pershin <mike.pershin@intel.com>
45 #define DEBUG_SUBSYSTEM S_LOG
47 #include <dt_object.h>
48 #include <llog_swab.h>
49 #include <lustre_fid.h>
51 #include <obd_class.h>
53 #include "llog_internal.h"
54 #include "local_storage.h"
57 * Implementation of the llog_operations::lop_declare_create
59 * This function is a wrapper over local_storage API function
60 * local_object_declare_create().
62 * \param[in] env execution environment
63 * \param[in] los local_storage for bottom storage device
64 * \param[in] o dt_object to create
65 * \param[in] th current transaction handle
67 * \retval 0 on successful declaration of the new object
68 * \retval negative error if declaration was failed
70 static int llog_osd_declare_new_object(const struct lu_env *env,
71 struct local_oid_storage *los,
75 struct llog_thread_info *lgi = llog_info(env);
77 lgi->lgi_attr.la_valid = LA_MODE;
78 lgi->lgi_attr.la_mode = S_IFREG | S_IRUGO | S_IWUSR;
79 lgi->lgi_dof.dof_type = dt_mode_to_dft(S_IFREG);
81 return local_object_declare_create(env, los, o, &lgi->lgi_attr,
86 * Implementation of the llog_operations::lop_create
88 * This function is a wrapper over local_storage API function
89 * local_object_create().
91 * \param[in] env execution environment
92 * \param[in] los local_storage for bottom storage device
93 * \param[in] o dt_object to create
94 * \param[in] th current transaction handle
96 * \retval 0 on successful creation of the new object
97 * \retval negative error if creation was failed
99 static int llog_osd_create_new_object(const struct lu_env *env,
100 struct local_oid_storage *los,
104 struct llog_thread_info *lgi = llog_info(env);
106 lgi->lgi_attr.la_valid = LA_MODE;
107 lgi->lgi_attr.la_mode = S_IFREG | S_IRUGO | S_IWUSR;
108 lgi->lgi_dof.dof_type = dt_mode_to_dft(S_IFREG);
110 return local_object_create(env, los, o, &lgi->lgi_attr,
115 * Implementation of the llog_operations::lop_exist
117 * This function checks that llog exists on storage.
119 * \param[in] handle llog handle of the current llog
121 * \retval true if llog object exists and is not just destroyed
122 * \retval false if llog doesn't exist or just destroyed
124 static int llog_osd_exist(struct llog_handle *handle)
126 LASSERT(handle->lgh_obj);
127 return dt_object_exists(handle->lgh_obj) &&
128 !lu_object_is_dying(handle->lgh_obj->do_lu.lo_header);
131 static void *rec_tail(struct llog_rec_hdr *rec)
133 return (void *)((char *)rec + rec->lrh_len -
134 sizeof(struct llog_rec_tail));
138 * Write a padding record to the llog
140 * This function writes a padding record to the end of llog. That may
141 * be needed if llog contains records of variable size, e.g. config logs
143 * The padding record just aligns llog to the llog chunk_size boundary if
144 * the current record doesn't fit in the remaining space.
146 * It allocates full length to avoid two separate writes for header and tail.
147 * Such 2-steps scheme needs extra protection and complex error handling.
149 * \param[in] env execution environment
150 * \param[in] o dt_object to create
151 * \param[in,out] off pointer to the padding start offset
152 * \param[in] len padding length
153 * \param[in] index index of the padding record in a llog
154 * \param[in] th current transaction handle
156 * \retval 0 on successful padding write
157 * \retval negative error if write failed
159 static int llog_osd_pad(const struct lu_env *env, struct dt_object *o,
160 loff_t *off, int len, int index, struct thandle *th)
162 struct llog_thread_info *lgi = llog_info(env);
163 struct llog_rec_hdr *rec;
164 struct llog_rec_tail *tail;
171 LASSERT(len >= LLOG_MIN_REC_SIZE && (len & 0x7) == 0);
178 rec->lrh_index = index;
179 rec->lrh_type = LLOG_PAD_MAGIC;
181 tail = rec_tail(rec);
183 tail->lrt_index = index;
185 lgi->lgi_buf.lb_buf = rec;
186 lgi->lgi_buf.lb_len = len;
187 rc = dt_record_write(env, o, &lgi->lgi_buf, off, th);
189 CERROR("%s: error writing padding record: rc = %d\n",
190 o->do_lu.lo_dev->ld_obd->obd_name, rc);
197 * Implementation of the llog_operations::lop_read_header
199 * This function reads the current llog header from the bottom storage
202 * \param[in] env execution environment
203 * \param[in] handle llog handle of the current llog
205 * \retval 0 on successful header read
206 * \retval negative error if read failed
208 static int llog_osd_read_header(const struct lu_env *env,
209 struct llog_handle *handle)
211 struct llog_rec_hdr *llh_hdr;
213 struct llog_thread_info *lgi;
214 enum llog_flag flags;
222 lgi = llog_info(env);
224 rc = dt_attr_get(env, o, &lgi->lgi_attr);
228 LASSERT(lgi->lgi_attr.la_valid & LA_SIZE);
230 if (lgi->lgi_attr.la_size == 0) {
231 CDEBUG(D_HA, "not reading header from 0-byte log\n");
235 flags = handle->lgh_hdr->llh_flags;
238 lgi->lgi_buf.lb_buf = handle->lgh_hdr;
239 lgi->lgi_buf.lb_len = handle->lgh_hdr_size;
240 rc = dt_read(env, o, &lgi->lgi_buf, &lgi->lgi_off);
241 llh_hdr = &handle->lgh_hdr->llh_hdr;
242 if (rc < sizeof(*llh_hdr) || rc < llh_hdr->lrh_len) {
243 CERROR("%s: error reading "DFID" log header size %d: rc = %d\n",
244 o->do_lu.lo_dev->ld_obd->obd_name,
245 PFID(lu_object_fid(&o->do_lu)), rc < 0 ? 0 : rc,
254 if (LLOG_REC_HDR_NEEDS_SWABBING(llh_hdr))
255 lustre_swab_llog_hdr(handle->lgh_hdr);
257 if (llh_hdr->lrh_type != LLOG_HDR_MAGIC) {
258 CERROR("%s: bad log %s "DFID" header magic: %#x "
259 "(expected %#x)\n", o->do_lu.lo_dev->ld_obd->obd_name,
260 handle->lgh_name ? handle->lgh_name : "",
261 PFID(lu_object_fid(&o->do_lu)),
262 llh_hdr->lrh_type, LLOG_HDR_MAGIC);
264 } else if (llh_hdr->lrh_len < LLOG_MIN_CHUNK_SIZE ||
265 llh_hdr->lrh_len > handle->lgh_hdr_size) {
266 CERROR("%s: incorrectly sized log %s "DFID" header: "
267 "%#x (expected at least %#x)\n"
268 "you may need to re-run lconf --write_conf.\n",
269 o->do_lu.lo_dev->ld_obd->obd_name,
270 handle->lgh_name ? handle->lgh_name : "",
271 PFID(lu_object_fid(&o->do_lu)),
272 llh_hdr->lrh_len, LLOG_MIN_CHUNK_SIZE);
274 } else if (LLOG_HDR_TAIL(handle->lgh_hdr)->lrt_index >
275 LLOG_HDR_BITMAP_SIZE(handle->lgh_hdr) ||
276 LLOG_HDR_TAIL(handle->lgh_hdr)->lrt_len !=
278 CERROR("%s: incorrectly sized log %s "DFID" tailer: "
280 o->do_lu.lo_dev->ld_obd->obd_name,
281 handle->lgh_name ? handle->lgh_name : "",
282 PFID(lu_object_fid(&o->do_lu)),
283 LLOG_HDR_TAIL(handle->lgh_hdr)->lrt_len, -EIO);
287 handle->lgh_hdr->llh_flags |= (flags & LLOG_F_EXT_MASK);
288 handle->lgh_last_idx = LLOG_HDR_TAIL(handle->lgh_hdr)->lrt_index;
294 * Implementation of the llog_operations::lop_declare_write
296 * This function declares the new record write.
298 * \param[in] env execution environment
299 * \param[in] loghandle llog handle of the current llog
300 * \param[in] rec llog record header. This is a real header of the full
301 * llog record to write. This is the beginning of buffer
302 * to write, the length of buffer is stored in
304 * \param[in] idx index of the llog record. If \a idx == -1 then this is
305 * append case, otherwise \a idx is the index of record
307 * \param[in] th current transaction handle
309 * \retval 0 on successful declaration
310 * \retval negative error if declaration failed
312 static int llog_osd_declare_write_rec(const struct lu_env *env,
313 struct llog_handle *loghandle,
314 struct llog_rec_hdr *rec,
315 int idx, struct thandle *th)
317 struct llog_thread_info *lgi = llog_info(env);
328 LASSERT(rec->lrh_len <= loghandle->lgh_ctxt->loc_chunk_size);
330 o = loghandle->lgh_obj;
333 chunk_size = loghandle->lgh_ctxt->loc_chunk_size;
334 lgi->lgi_buf.lb_len = chunk_size;
335 lgi->lgi_buf.lb_buf = NULL;
336 /* each time we update header */
337 rc = dt_declare_record_write(env, o, &lgi->lgi_buf, 0,
339 if (rc || idx == 0) /* if error or just header */
343 * the pad record can be inserted so take into account double
346 lgi->lgi_buf.lb_len = chunk_size * 2;
347 lgi->lgi_buf.lb_buf = NULL;
348 /* XXX: implement declared window or multi-chunks approach */
349 rc = dt_declare_record_write(env, o, &lgi->lgi_buf, -1, th);
355 * Implementation of the llog_operations::lop_write
357 * This function writes the new record in the llog or modify the existed one.
359 * \param[in] env execution environment
360 * \param[in] loghandle llog handle of the current llog
361 * \param[in] rec llog record header. This is a real header of
362 * the full llog record to write. This is
363 * the beginning of buffer to write, the length
364 * of buffer is stored in \a rec::lrh_len
365 * \param[out] reccookie pointer to the cookie to return back if needed.
366 * It is used for further cancel of this llog
368 * \param[in] idx index of the llog record. If \a idx == -1 then
369 * this is append case, otherwise \a idx is
370 * the index of record to modify
371 * \param[in] th current transaction handle
373 * \retval 0 on successful write && \a reccookie == NULL
374 * 1 on successful write && \a reccookie != NULL
375 * \retval negative error if write failed
377 static int llog_osd_write_rec(const struct lu_env *env,
378 struct llog_handle *loghandle,
379 struct llog_rec_hdr *rec,
380 struct llog_cookie *reccookie,
381 int idx, struct thandle *th)
383 struct llog_thread_info *lgi = llog_info(env);
384 struct llog_log_hdr *llh;
385 int reclen = rec->lrh_len;
387 struct llog_rec_tail *lrt;
394 llh = loghandle->lgh_hdr;
395 o = loghandle->lgh_obj;
397 chunk_size = llh->llh_hdr.lrh_len;
398 CDEBUG(D_OTHER, "new record %x to "DFID"\n",
399 rec->lrh_type, PFID(lu_object_fid(&o->do_lu)));
401 if (!llog_osd_exist(loghandle))
404 /* record length should not bigger than */
405 if (reclen > loghandle->lgh_hdr->llh_hdr.lrh_len)
408 /* sanity check for fixed-records llog */
409 if (idx != LLOG_HEADER_IDX && (llh->llh_flags & LLOG_F_IS_FIXSIZE)) {
410 LASSERT(llh->llh_size != 0);
411 LASSERT(llh->llh_size == reclen);
414 rc = dt_attr_get(env, o, &lgi->lgi_attr);
419 * The modification case.
420 * If idx set then the record with that index must be modified.
421 * There are three cases possible:
422 * 1) the common case is the llog header update (idx == 0)
423 * 2) the llog record modification during llog process.
424 * This is indicated by the \a loghandle::lgh_cur_idx > 0.
425 * In that case the \a loghandle::lgh_cur_offset
426 * 3) otherwise this is assumed that llog consist of records of
427 * fixed size, i.e. catalog. The llog header must has llh_size
428 * field equal to record size. The record offset is calculated
429 * just by /a idx value
431 * During modification we don't need extra header update because
432 * the bitmap and record count are not changed. The record header
433 * and tail remains the same too.
435 if (idx != LLOG_NEXT_IDX) {
436 /* llog can be empty only when first record is being written */
437 LASSERT(ergo(idx > 0, lgi->lgi_attr.la_size > 0));
439 if (!ext2_test_bit(idx, LLOG_HDR_BITMAP(llh))) {
440 CERROR("%s: modify unset record %u\n",
441 o->do_lu.lo_dev->ld_obd->obd_name, idx);
445 if (idx != rec->lrh_index) {
446 CERROR("%s: modify index mismatch %d %u\n",
447 o->do_lu.lo_dev->ld_obd->obd_name, idx,
452 if (idx == LLOG_HEADER_IDX) {
453 /* llog header update */
454 __u32 *bitmap = LLOG_HDR_BITMAP(llh);
458 /* If it does not indicate the bitmap index
459 * (reccookie == NULL), then it means update
460 * the whole update header. Otherwise only
461 * update header and bits needs to be updated,
462 * and in DNE cases, it will signaficantly
463 * shrink the RPC size.
464 * see distribute_txn_cancel_records()*/
465 if (reccookie == NULL) {
466 lgi->lgi_buf.lb_len = reclen;
467 lgi->lgi_buf.lb_buf = rec;
468 rc = dt_record_write(env, o, &lgi->lgi_buf,
473 /* update the header */
474 lgi->lgi_buf.lb_len = llh->llh_bitmap_offset;
475 lgi->lgi_buf.lb_buf = llh;
476 rc = dt_record_write(env, o, &lgi->lgi_buf,
481 /* update the bitmap */
482 index = reccookie->lgc_index;
483 lgi->lgi_off = llh->llh_bitmap_offset +
484 (index / (sizeof(*bitmap) * 8)) *
486 lgi->lgi_buf.lb_len = sizeof(*bitmap);
487 lgi->lgi_buf.lb_buf =
488 &bitmap[index/(sizeof(*bitmap)*8)];
489 rc = dt_record_write(env, o, &lgi->lgi_buf,
493 } else if (loghandle->lgh_cur_idx > 0) {
495 * The lgh_cur_offset can be used only if index is
498 if (idx != loghandle->lgh_cur_idx) {
499 CERROR("%s: modify index mismatch %d %d\n",
500 o->do_lu.lo_dev->ld_obd->obd_name, idx,
501 loghandle->lgh_cur_idx);
505 lgi->lgi_off = loghandle->lgh_cur_offset;
506 CDEBUG(D_OTHER, "modify record "DFID": idx:%u, "
507 "len:%u offset %llu\n",
508 PFID(&loghandle->lgh_id.lgl_oi.oi_fid), idx,
509 rec->lrh_len, (long long)lgi->lgi_off);
510 } else if (llh->llh_flags & LLOG_F_IS_FIXSIZE) {
511 lgi->lgi_off = llh->llh_hdr.lrh_len +
514 /* This can be result of lgh_cur_idx is not set during
515 * llog processing or llh_size is not set to proper
516 * record size for fixed records llog. Therefore it is
517 * impossible to get record offset. */
518 CERROR("%s: can't get record offset, idx:%d, "
519 "len:%u.\n", o->do_lu.lo_dev->ld_obd->obd_name,
524 /* update only data, header and tail remain the same */
525 lgi->lgi_off += sizeof(struct llog_rec_hdr);
526 lgi->lgi_buf.lb_len = REC_DATA_LEN(rec);
527 lgi->lgi_buf.lb_buf = REC_DATA(rec);
528 rc = dt_record_write(env, o, &lgi->lgi_buf, &lgi->lgi_off, th);
529 if (rc == 0 && reccookie) {
530 reccookie->lgc_lgl = loghandle->lgh_id;
531 reccookie->lgc_index = idx;
539 * The most common case of using llog. The new index is assigned to
540 * the new record, new bit is set in llog bitmap and llog count is
543 * Make sure that records don't cross a chunk boundary, so we can
544 * process them page-at-a-time if needed. If it will cross a chunk
545 * boundary, write in a fake (but referenced) entry to pad the chunk.
549 /* simulate ENOSPC when new plain llog is being added to the
551 if (OBD_FAIL_CHECK(OBD_FAIL_MDS_LLOG_CREATE_FAILED2) &&
552 llh->llh_flags & LLOG_F_IS_CAT)
555 LASSERT(lgi->lgi_attr.la_valid & LA_SIZE);
556 orig_last_idx = loghandle->lgh_last_idx;
557 lgi->lgi_off = lgi->lgi_attr.la_size;
559 if (loghandle->lgh_max_size > 0 &&
560 lgi->lgi_off >= loghandle->lgh_max_size) {
561 CDEBUG(D_OTHER, "llog is getting too large (%u > %u) at %u "
562 DFID"\n", (unsigned)lgi->lgi_off,
563 loghandle->lgh_max_size, (int)loghandle->lgh_last_idx,
564 PFID(&loghandle->lgh_id.lgl_oi.oi_fid));
565 /* this is to signal that this llog is full */
566 loghandle->lgh_last_idx = LLOG_HDR_BITMAP_SIZE(llh) - 1;
570 left = chunk_size - (lgi->lgi_off & (chunk_size - 1));
571 /* NOTE: padding is a record, but no bit is set */
572 if (left != 0 && left != reclen &&
573 left < (reclen + LLOG_MIN_REC_SIZE)) {
574 index = loghandle->lgh_last_idx + 1;
575 rc = llog_osd_pad(env, o, &lgi->lgi_off, left, index, th);
579 loghandle->lgh_last_idx++; /* for pad rec */
581 /* if it's the last idx in log file, then return -ENOSPC
582 * or wrap around if a catalog */
583 if (llog_is_full(loghandle) ||
584 unlikely(llh->llh_flags & LLOG_F_IS_CAT &&
585 OBD_FAIL_PRECHECK(OBD_FAIL_CAT_RECORDS) &&
586 loghandle->lgh_last_idx >= cfs_fail_val)) {
587 if (llh->llh_flags & LLOG_F_IS_CAT)
588 loghandle->lgh_last_idx = 0;
593 /* increment the last_idx along with llh_tail index, they should
594 * be equal for a llog lifetime */
595 loghandle->lgh_last_idx++;
596 index = loghandle->lgh_last_idx;
597 LLOG_HDR_TAIL(llh)->lrt_index = index;
599 * NB: the caller should make sure only 1 process access
600 * the lgh_last_idx, e.g. append should be exclusive.
601 * Otherwise it might hit the assert.
603 LASSERT(index < LLOG_HDR_BITMAP_SIZE(llh));
604 rec->lrh_index = index;
606 lrt->lrt_len = rec->lrh_len;
607 lrt->lrt_index = rec->lrh_index;
609 /* the lgh_hdr_mutex protects llog header data from concurrent
610 * update/cancel, the llh_count and llh_bitmap are protected */
611 mutex_lock(&loghandle->lgh_hdr_mutex);
612 if (ext2_set_bit(index, LLOG_HDR_BITMAP(llh))) {
613 CERROR("%s: index %u already set in log bitmap\n",
614 o->do_lu.lo_dev->ld_obd->obd_name, index);
615 mutex_unlock(&loghandle->lgh_hdr_mutex);
616 LBUG(); /* should never happen */
620 if (!(llh->llh_flags & LLOG_F_IS_FIXSIZE)) {
621 /* Update the minimum size of the llog record */
622 if (llh->llh_size == 0)
623 llh->llh_size = reclen;
624 else if (reclen < llh->llh_size)
625 llh->llh_size = reclen;
628 if (lgi->lgi_attr.la_size == 0) {
630 lgi->lgi_buf.lb_len = llh->llh_hdr.lrh_len;
631 lgi->lgi_buf.lb_buf = &llh->llh_hdr;
632 rc = dt_record_write(env, o, &lgi->lgi_buf, &lgi->lgi_off, th);
634 GOTO(out_unlock, rc);
636 __u32 *bitmap = LLOG_HDR_BITMAP(llh);
638 /* Note: If this is not initialization (size == 0), then do not
639 * write the whole header (8k bytes), only update header/tail
640 * and bits needs to be updated. Because this update might be
641 * part of cross-MDT operation, which needs to write these
642 * updates into the update log(32KB limit) and also pack inside
643 * the RPC (1MB limit), if we write 8K for each operation, which
644 * will cost a lot space, and keep us adding more updates to one
647 lgi->lgi_buf.lb_len = llh->llh_bitmap_offset;
648 lgi->lgi_buf.lb_buf = &llh->llh_hdr;
649 rc = dt_record_write(env, o, &lgi->lgi_buf, &lgi->lgi_off, th);
651 GOTO(out_unlock, rc);
653 lgi->lgi_off = llh->llh_bitmap_offset +
654 (index / (sizeof(*bitmap) * 8)) * sizeof(*bitmap);
655 lgi->lgi_buf.lb_len = sizeof(*bitmap);
656 lgi->lgi_buf.lb_buf = &bitmap[index/(sizeof(*bitmap)*8)];
657 rc = dt_record_write(env, o, &lgi->lgi_buf, &lgi->lgi_off, th);
659 GOTO(out_unlock, rc);
661 lgi->lgi_off = (unsigned long)LLOG_HDR_TAIL(llh) -
663 lgi->lgi_buf.lb_len = sizeof(llh->llh_tail);
664 lgi->lgi_buf.lb_buf = LLOG_HDR_TAIL(llh);
665 rc = dt_record_write(env, o, &lgi->lgi_buf, &lgi->lgi_off, th);
667 GOTO(out_unlock, rc);
671 /* unlock here for remote object */
672 mutex_unlock(&loghandle->lgh_hdr_mutex);
676 /* computed index can be used to determine offset for fixed-size
677 * records. This also allows to handle Catalog wrap around case */
678 if (llh->llh_flags & LLOG_F_IS_FIXSIZE) {
679 lgi->lgi_off = llh->llh_hdr.lrh_len + (index - 1) * reclen;
681 rc = dt_attr_get(env, o, &lgi->lgi_attr);
685 LASSERT(lgi->lgi_attr.la_valid & LA_SIZE);
686 lgi->lgi_off = max_t(__u64, lgi->lgi_attr.la_size,
690 lgi->lgi_buf.lb_len = reclen;
691 lgi->lgi_buf.lb_buf = rec;
692 rc = dt_record_write(env, o, &lgi->lgi_buf, &lgi->lgi_off, th);
696 CDEBUG(D_HA, "added record "DFID".%u, %u off%llu\n",
697 PFID(lu_object_fid(&o->do_lu)), index, rec->lrh_len,
699 if (reccookie != NULL) {
700 reccookie->lgc_lgl = loghandle->lgh_id;
701 reccookie->lgc_index = index;
702 if ((rec->lrh_type == MDS_UNLINK_REC) ||
703 (rec->lrh_type == MDS_SETATTR64_REC))
704 reccookie->lgc_subsys = LLOG_MDS_OST_ORIG_CTXT;
705 else if (rec->lrh_type == OST_SZ_REC)
706 reccookie->lgc_subsys = LLOG_SIZE_ORIG_CTXT;
708 reccookie->lgc_subsys = -1;
713 /* cleanup llog for error case */
714 mutex_lock(&loghandle->lgh_hdr_mutex);
715 ext2_clear_bit(index, LLOG_HDR_BITMAP(llh));
717 mutex_unlock(&loghandle->lgh_hdr_mutex);
719 /* restore llog last_idx */
720 if (dt_object_remote(o)) {
721 loghandle->lgh_last_idx = orig_last_idx;
722 } else if (--loghandle->lgh_last_idx == 0 &&
723 (llh->llh_flags & LLOG_F_IS_CAT) && llh->llh_cat_idx != 0) {
724 /* catalog had just wrap-around case */
725 loghandle->lgh_last_idx = LLOG_HDR_BITMAP_SIZE(llh) - 1;
728 LLOG_HDR_TAIL(llh)->lrt_index = loghandle->lgh_last_idx;
734 * We can skip reading at least as many log blocks as the number of
735 * minimum sized log records we are skipping. If it turns out
736 * that we are not far enough along the log (because the
737 * actual records are larger than minimum size) we just skip
740 * Note: in llog_process_thread, it will use bitmap offset as
741 * the index to locate the record, which also includs some pad
742 * records, whose record size is very small, and it also does not
743 * consider pad record when recording minimum record size (otherwise
744 * min_record size might be too small), so in some rare cases,
745 * it might skip too much record for @goal, see llog_osd_next_block().
747 * When force_mini_rec is true, it means we have to use LLOG_MIN_REC_SIZE
748 * as the min record size to skip over, usually because in the previous
749 * try, it skip too much record, see loog_osd_next(prev)_block().
751 static inline void llog_skip_over(struct llog_handle *lgh, __u64 *off,
752 int curr, int goal, __u32 chunk_size,
755 struct llog_log_hdr *llh = lgh->lgh_hdr;
757 /* Goal should not bigger than the record count */
758 if (goal > lgh->lgh_last_idx)
759 goal = lgh->lgh_last_idx;
762 if (llh->llh_flags & LLOG_F_IS_FIXSIZE) {
763 *off = chunk_size + (goal - 1) * llh->llh_size;
765 __u64 min_rec_size = LLOG_MIN_REC_SIZE;
767 if (llh->llh_size > 0 && !force_mini_rec)
768 min_rec_size = llh->llh_size;
770 *off = *off + (goal - curr - 1) * min_rec_size;
773 /* always align with lower chunk boundary*/
774 *off &= ~(chunk_size - 1);
778 * Remove optional fields that the client doesn't expect.
779 * This is typically in order to ensure compatibility with older clients.
780 * It is assumed that since we exclusively remove fields, the block will be
781 * big enough to handle the remapped records. It is also assumed that records
782 * of a block have the same format (i.e.: the same features enabled).
784 * \param[in,out] hdr Header of the block of records to remap.
785 * \param[in,out] last_hdr Last header, don't read past this point.
786 * \param[in] flags Flags describing the fields to keep.
788 static void changelog_block_trim_ext(struct llog_rec_hdr *hdr,
789 struct llog_rec_hdr *last_hdr,
790 enum changelog_rec_flags flags)
792 if (hdr->lrh_type != CHANGELOG_REC)
796 struct changelog_rec *rec = (struct changelog_rec *)(hdr + 1);
798 if (unlikely(hdr->lrh_len == 0)) {
799 /* It is corruption case, we cannot know the next rec,
800 * jump to the last one directly to avoid dead loop. */
801 LCONSOLE(D_WARNING, "Hit invalid llog record: "
802 "idx %u, type %u, id %u\n",
803 hdr->lrh_index, hdr->lrh_type, hdr->lrh_id);
804 hdr = llog_rec_hdr_next(last_hdr);
805 if (unlikely(hdr == last_hdr))
806 LCONSOLE(D_WARNING, "The last record crashed: "
807 "idx %u, type %u, id %u\n",
808 hdr->lrh_index, hdr->lrh_type,
813 changelog_remap_rec(rec, rec->cr_flags & flags);
814 hdr = llog_rec_hdr_next(hdr);
815 /* Yield CPU to avoid soft-lockup if there are too many records
818 } while ((char *)hdr <= (char *)last_hdr);
822 * Implementation of the llog_operations::lop_next_block
824 * This function finds the the next llog block to return which contains
825 * record with required index. It is main part of llog processing.
827 * \param[in] env execution environment
828 * \param[in] loghandle llog handle of the current llog
829 * \param[in,out] cur_idx index preceeding cur_offset
830 * \param[in] next_idx target index to find
831 * \param[in,out] cur_offset furtherst point read in the file
832 * \param[in] buf pointer to data buffer to fill
833 * \param[in] len required len to read, it is
834 * usually llog chunk_size.
836 * \retval 0 on successful buffer read
837 * \retval negative value on error
839 static int llog_osd_next_block(const struct lu_env *env,
840 struct llog_handle *loghandle, int *cur_idx,
841 int next_idx, __u64 *cur_offset, void *buf,
844 struct llog_thread_info *lgi = llog_info(env);
846 struct dt_device *dt;
849 int last_idx = *cur_idx;
850 __u64 last_offset = *cur_offset;
851 bool force_mini_rec = false;
858 chunk_size = loghandle->lgh_hdr->llh_hdr.lrh_len;
859 if (len == 0 || len & (chunk_size - 1))
863 LASSERT(loghandle->lgh_ctxt);
865 o = loghandle->lgh_obj;
867 LASSERT(dt_object_exists(o));
868 dt = lu2dt_dev(o->do_lu.lo_dev);
871 rc = dt_attr_get(env, o, &lgi->lgi_attr);
875 CDEBUG(D_OTHER, "looking for log index %u (cur idx %u off"
876 "%llu), size %llu\n", next_idx, *cur_idx,
877 *cur_offset, lgi->lgi_attr.la_size);
879 while (*cur_offset < lgi->lgi_attr.la_size) {
880 struct llog_rec_hdr *rec, *last_rec;
881 struct llog_rec_tail *tail;
883 llog_skip_over(loghandle, cur_offset, *cur_idx,
884 next_idx, chunk_size, force_mini_rec);
886 /* read up to next llog chunk_size block */
887 lgi->lgi_buf.lb_len = chunk_size -
888 (*cur_offset & (chunk_size - 1));
889 lgi->lgi_buf.lb_buf = buf;
891 rc = dt_read(env, o, &lgi->lgi_buf, cur_offset);
893 if (rc == -EBADR && !force_mini_rec)
896 CERROR("%s: can't read llog block from log "DFID
897 " offset %llu: rc = %d\n",
898 o->do_lu.lo_dev->ld_obd->obd_name,
899 PFID(lu_object_fid(&o->do_lu)), *cur_offset,
905 /* signal the end of the valid buffer to
907 memset(buf + rc, 0, len - rc);
910 if (rc == 0) { /* end of file, nothing to do */
916 if (rc < sizeof(*tail)) {
920 CERROR("%s: invalid llog block at log id "DFID":%x "
922 o->do_lu.lo_dev->ld_obd->obd_name,
923 PFID(&loghandle->lgh_id.lgl_oi.oi_fid),
924 loghandle->lgh_id.lgl_ogen, *cur_offset);
925 GOTO(out, rc = -EINVAL);
929 if (LLOG_REC_HDR_NEEDS_SWABBING(rec))
930 lustre_swab_llog_rec(rec);
932 tail = (struct llog_rec_tail *)((char *)buf + rc -
933 sizeof(struct llog_rec_tail));
934 /* get the last record in block */
935 last_rec = (struct llog_rec_hdr *)((char *)buf + rc -
938 if (LLOG_REC_HDR_NEEDS_SWABBING(last_rec))
939 lustre_swab_llog_rec(last_rec);
941 if (last_rec->lrh_index != tail->lrt_index) {
942 CERROR("%s: invalid llog tail at log id "DFID":%x "
943 "offset %llu last_rec idx %u tail idx %u"
944 "lrt len %u read_size %d\n",
945 o->do_lu.lo_dev->ld_obd->obd_name,
946 PFID(&loghandle->lgh_id.lgl_oi.oi_fid),
947 loghandle->lgh_id.lgl_ogen, *cur_offset,
948 last_rec->lrh_index, tail->lrt_index,
950 GOTO(out, rc = -EINVAL);
953 *cur_idx = tail->lrt_index;
955 /* this shouldn't happen */
956 if (tail->lrt_index == 0) {
957 CERROR("%s: invalid llog tail at log id "DFID":%x "
958 "offset %llu bytes %d\n",
959 o->do_lu.lo_dev->ld_obd->obd_name,
960 PFID(&loghandle->lgh_id.lgl_oi.oi_fid),
961 loghandle->lgh_id.lgl_ogen, *cur_offset, rc);
962 GOTO(out, rc = -EINVAL);
964 if (tail->lrt_index < next_idx) {
966 last_offset = *cur_offset;
970 /* sanity check that the start of the new buffer is no farther
971 * than the record that we wanted. This shouldn't happen. */
972 if (rec->lrh_index > next_idx) {
973 if (!force_mini_rec && next_idx > last_idx)
976 CERROR("%s: missed desired record? %u > %u\n",
977 o->do_lu.lo_dev->ld_obd->obd_name,
978 rec->lrh_index, next_idx);
979 GOTO(out, rc = -ENOENT);
982 /* Trim unsupported extensions for compat w/ older clients */
983 if (!(loghandle->lgh_hdr->llh_flags & LLOG_F_EXT_JOBID))
984 changelog_block_trim_ext(rec, last_rec,
985 CLF_VERSION | CLF_RENAME);
990 /* Note: because there are some pad records in the
991 * llog, so llog_skip_over() might skip too much
992 * records, let's try skip again with minimum record */
993 force_mini_rec = true;
994 *cur_offset = last_offset;
997 GOTO(out, rc = -EIO);
1003 * Implementation of the llog_operations::lop_prev_block
1005 * This function finds the llog block to return which contains
1006 * record with required index but in reverse order - from end of llog
1008 * It is main part of reverse llog processing.
1010 * \param[in] env execution environment
1011 * \param[in] loghandle llog handle of the current llog
1012 * \param[in] prev_idx target index to find
1013 * \param[in] buf pointer to data buffer to fill
1014 * \param[in] len required len to read, it is llog_chunk_size usually.
1016 * \retval 0 on successful buffer read
1017 * \retval negative value on error
1019 static int llog_osd_prev_block(const struct lu_env *env,
1020 struct llog_handle *loghandle,
1021 int prev_idx, void *buf, int len)
1023 struct llog_thread_info *lgi = llog_info(env);
1024 struct dt_object *o;
1025 struct dt_device *dt;
1032 chunk_size = loghandle->lgh_hdr->llh_hdr.lrh_len;
1033 if (len == 0 || len & (chunk_size - 1))
1036 CDEBUG(D_OTHER, "looking for log index %u\n", prev_idx);
1039 LASSERT(loghandle->lgh_ctxt);
1041 o = loghandle->lgh_obj;
1043 LASSERT(dt_object_exists(o));
1044 dt = lu2dt_dev(o->do_lu.lo_dev);
1047 /* Let's only use mini record size for previous block read
1049 cur_offset = chunk_size;
1050 llog_skip_over(loghandle, &cur_offset, 0, prev_idx,
1053 rc = dt_attr_get(env, o, &lgi->lgi_attr);
1057 while (cur_offset < lgi->lgi_attr.la_size) {
1058 struct llog_rec_hdr *rec, *last_rec;
1059 struct llog_rec_tail *tail;
1061 lgi->lgi_buf.lb_len = len;
1062 lgi->lgi_buf.lb_buf = buf;
1063 rc = dt_read(env, o, &lgi->lgi_buf, &cur_offset);
1065 CERROR("%s: can't read llog block from log "DFID
1066 " offset %llu: rc = %d\n",
1067 o->do_lu.lo_dev->ld_obd->obd_name,
1068 PFID(lu_object_fid(&o->do_lu)), cur_offset, rc);
1072 if (rc == 0) /* end of file, nothing to do */
1075 if (rc < sizeof(*tail)) {
1076 CERROR("%s: invalid llog block at log id "DFID":%x "
1078 o->do_lu.lo_dev->ld_obd->obd_name,
1079 PFID(&loghandle->lgh_id.lgl_oi.oi_fid),
1080 loghandle->lgh_id.lgl_ogen, cur_offset);
1081 GOTO(out, rc = -EINVAL);
1085 if (LLOG_REC_HDR_NEEDS_SWABBING(rec))
1086 lustre_swab_llog_rec(rec);
1088 tail = (struct llog_rec_tail *)((char *)buf + rc -
1089 sizeof(struct llog_rec_tail));
1090 /* get the last record in block */
1091 last_rec = (struct llog_rec_hdr *)((char *)buf + rc -
1092 le32_to_cpu(tail->lrt_len));
1094 if (LLOG_REC_HDR_NEEDS_SWABBING(last_rec))
1095 lustre_swab_llog_rec(last_rec);
1096 LASSERT(last_rec->lrh_index == tail->lrt_index);
1098 /* this shouldn't happen */
1099 if (tail->lrt_index == 0) {
1100 CERROR("%s: invalid llog tail at log id "DFID":%x "
1102 o->do_lu.lo_dev->ld_obd->obd_name,
1103 PFID(&loghandle->lgh_id.lgl_oi.oi_fid),
1104 loghandle->lgh_id.lgl_ogen, cur_offset);
1105 GOTO(out, rc = -EINVAL);
1107 if (tail->lrt_index < prev_idx)
1110 /* sanity check that the start of the new buffer is no farther
1111 * than the record that we wanted. This shouldn't happen. */
1112 if (rec->lrh_index > prev_idx) {
1113 CERROR("%s: missed desired record? %u > %u\n",
1114 o->do_lu.lo_dev->ld_obd->obd_name,
1115 rec->lrh_index, prev_idx);
1116 GOTO(out, rc = -ENOENT);
1119 /* Trim unsupported extensions for compat w/ older clients */
1120 if (!(loghandle->lgh_hdr->llh_flags & LLOG_F_EXT_JOBID))
1121 changelog_block_trim_ext(rec, last_rec,
1122 CLF_VERSION | CLF_RENAME);
1126 GOTO(out, rc = -EIO);
1132 * This is helper function to get llog directory object. It is used by named
1133 * llog operations to find/insert/delete llog entry from llog directory.
1135 * \param[in] env execution environment
1136 * \param[in] ctxt llog context
1138 * \retval dt_object of llog directory
1139 * \retval ERR_PTR of negative value on error
1141 static struct dt_object *llog_osd_dir_get(const struct lu_env *env,
1142 struct llog_ctxt *ctxt)
1144 struct dt_device *dt;
1145 struct dt_thread_info *dti = dt_info(env);
1146 struct dt_object *dir;
1149 dt = ctxt->loc_exp->exp_obd->obd_lvfs_ctxt.dt;
1150 if (ctxt->loc_dir == NULL) {
1151 rc = dt_root_get(env, dt, &dti->dti_fid);
1154 dir = dt_locate(env, dt, &dti->dti_fid);
1156 if (!IS_ERR(dir) && !dt_try_as_dir(env, dir)) {
1157 dt_object_put(env, dir);
1158 return ERR_PTR(-ENOTDIR);
1161 lu_object_get(&ctxt->loc_dir->do_lu);
1162 dir = ctxt->loc_dir;
1169 * Implementation of the llog_operations::lop_open
1171 * This function opens the llog by its logid or by name, it may open also
1172 * non existent llog and assing then new id to it.
1173 * The llog_open/llog_close pair works similar to lu_object_find/put,
1174 * the object may not exist prior open. The result of open is just dt_object
1175 * in the llog header.
1177 * \param[in] env execution environment
1178 * \param[in] handle llog handle of the current llog
1179 * \param[in] logid logid of llog to open (nameless llog)
1180 * \param[in] name name of llog to open (named llog)
1181 * \param[in] open_param
1182 * LLOG_OPEN_NEW - new llog, may not exist
1183 * LLOG_OPEN_EXIST - old llog, must exist
1185 * \retval 0 on successful open, llog_handle::lgh_obj
1186 * contains the dt_object of the llog.
1187 * \retval negative value on error
1189 static int llog_osd_open(const struct lu_env *env, struct llog_handle *handle,
1190 struct llog_logid *logid, char *name,
1191 enum llog_open_param open_param)
1193 struct llog_thread_info *lgi = llog_info(env);
1194 struct llog_ctxt *ctxt = handle->lgh_ctxt;
1195 struct dt_object *o;
1196 struct dt_device *dt;
1197 struct ls_device *ls;
1198 struct local_oid_storage *los = NULL;
1200 bool new_id = false;
1206 LASSERT(ctxt->loc_exp);
1207 LASSERT(ctxt->loc_exp->exp_obd);
1208 dt = ctxt->loc_exp->exp_obd->obd_lvfs_ctxt.dt;
1210 if (ctxt->loc_flags & LLOG_CTXT_FLAG_NORMAL_FID) {
1211 struct lu_object_conf conf = { 0 };
1212 if (logid != NULL) {
1213 logid_to_fid(logid, &lgi->lgi_fid);
1215 /* If logid == NULL, then it means the caller needs
1216 * to allocate new FID (llog_cat_declare_add_rec()). */
1217 rc = obd_fid_alloc(env, ctxt->loc_exp,
1218 &lgi->lgi_fid, NULL);
1222 conf.loc_flags = LOC_F_NEW;
1225 o = dt_locate_at(env, dt, &lgi->lgi_fid,
1226 dt->dd_lu_dev.ld_site->ls_top_dev, &conf);
1233 ls = ls_device_get(dt);
1235 RETURN(PTR_ERR(ls));
1237 mutex_lock(&ls->ls_los_mutex);
1238 los = dt_los_find(ls, name != NULL ? FID_SEQ_LLOG_NAME : FID_SEQ_LLOG);
1239 mutex_unlock(&ls->ls_los_mutex);
1241 ls_device_put(env, ls);
1245 if (logid != NULL) {
1246 logid_to_fid(logid, &lgi->lgi_fid);
1248 struct dt_object *llog_dir;
1250 llog_dir = llog_osd_dir_get(env, ctxt);
1251 if (IS_ERR(llog_dir))
1252 GOTO(out, rc = PTR_ERR(llog_dir));
1253 dt_read_lock(env, llog_dir, 0);
1254 rc = dt_lookup_dir(env, llog_dir, name, &lgi->lgi_fid);
1255 dt_read_unlock(env, llog_dir);
1256 dt_object_put(env, llog_dir);
1257 if (rc == -ENOENT && open_param == LLOG_OPEN_NEW) {
1258 /* generate fid for new llog */
1259 rc = local_object_fid_generate(env, los,
1265 OBD_ALLOC(handle->lgh_name, strlen(name) + 1);
1266 if (handle->lgh_name)
1267 strcpy(handle->lgh_name, name);
1269 GOTO(out, rc = -ENOMEM);
1271 LASSERTF(open_param & LLOG_OPEN_NEW, "%#x\n", open_param);
1272 /* generate fid for new llog */
1274 rc = local_object_fid_generate(env, los, &lgi->lgi_fid);
1280 o = ls_locate(env, ls, &lgi->lgi_fid, NULL);
1282 GOTO(out_name, rc = PTR_ERR(o));
1284 if (dt_object_exists(o) && new_id) {
1285 /* llog exists with just generated ID, e.g. some old llog file
1286 * still is in use or is orphan, drop a warn and skip it. */
1287 CDEBUG(D_INFO, "%s: llog exists with the same FID: "DFID
1289 o->do_lu.lo_dev->ld_obd->obd_name,
1290 PFID(lu_object_fid(&o->do_lu)));
1291 dt_object_put(env, o);
1292 /* just skip this llog ID, we shouldn't delete it because we
1293 * don't know exactly what is its purpose and state. */
1298 /* No new llog is expected but doesn't exist */
1299 if (open_param != LLOG_OPEN_NEW && !dt_object_exists(o))
1300 GOTO(out_put, rc = -ENOENT);
1302 fid_to_logid(&lgi->lgi_fid, &handle->lgh_id);
1303 handle->lgh_obj = o;
1304 handle->private_data = los;
1305 LASSERT(handle->lgh_ctxt);
1310 dt_object_put(env, o);
1312 if (handle->lgh_name != NULL)
1313 OBD_FREE(handle->lgh_name, strlen(name) + 1);
1321 * Get dir for regular fid log object
1323 * Get directory for regular fid log object, and these regular fid log
1324 * object will be inserted under this directory, to satisfy the FS
1325 * consistency check, e2fsck etc.
1327 * \param [in] env execution environment
1328 * \param [in] dto llog object
1330 * \retval pointer to the directory if it is found.
1331 * \retval ERR_PTR(negative errno) if it fails.
1333 struct dt_object *llog_osd_get_regular_fid_dir(const struct lu_env *env,
1334 struct dt_object *dto)
1336 struct llog_thread_info *lgi = llog_info(env);
1337 struct seq_server_site *ss = dto->do_lu.lo_dev->ld_site->ld_seq_site;
1338 struct lu_seq_range *range = &lgi->lgi_range;
1339 struct lu_fid *dir_fid = &lgi->lgi_fid;
1340 struct dt_object *dir;
1344 fld_range_set_any(range);
1345 LASSERT(ss != NULL);
1346 rc = ss->ss_server_fld->lsf_seq_lookup(env, ss->ss_server_fld,
1347 fid_seq(lu_object_fid(&dto->do_lu)), range);
1349 RETURN(ERR_PTR(rc));
1351 lu_update_log_dir_fid(dir_fid, range->lsr_index);
1352 dir = dt_locate(env, lu2dt_dev(dto->do_lu.lo_dev), dir_fid);
1356 if (!dt_try_as_dir(env, dir)) {
1357 dt_object_put(env, dir);
1358 RETURN(ERR_PTR(-ENOTDIR));
1365 * Add llog object with regular FID to name entry
1367 * Add llog object with regular FID to name space, and each llog
1368 * object on each MDT will be /update_log_dir/[seq:oid:ver],
1369 * so to satisfy the namespace consistency check, e2fsck etc.
1371 * \param [in] env execution environment
1372 * \param [in] dto llog object
1373 * \param [in] th thandle
1374 * \param [in] declare if it is declare or execution
1376 * \retval 0 if insertion succeeds.
1377 * \retval negative errno if insertion fails.
1380 llog_osd_regular_fid_add_name_entry(const struct lu_env *env,
1381 struct dt_object *dto,
1382 struct thandle *th, bool declare)
1384 struct llog_thread_info *lgi = llog_info(env);
1385 const struct lu_fid *fid = lu_object_fid(&dto->do_lu);
1386 struct dt_insert_rec *rec = &lgi->lgi_dt_rec;
1387 struct dt_object *dir;
1388 char *name = lgi->lgi_name;
1392 if (!fid_is_norm(fid))
1395 dir = llog_osd_get_regular_fid_dir(env, dto);
1397 RETURN(PTR_ERR(dir));
1400 rec->rec_type = S_IFREG;
1401 snprintf(name, sizeof(lgi->lgi_name), DFID, PFID(fid));
1402 dt_write_lock(env, dir, 0);
1404 rc = dt_declare_insert(env, dir, (struct dt_rec *)rec,
1405 (struct dt_key *)name, th);
1407 rc = dt_insert(env, dir, (struct dt_rec *)rec,
1408 (struct dt_key *)name, th, 1);
1410 dt_write_unlock(env, dir);
1412 dt_object_put(env, dir);
1418 * Implementation of the llog_operations::lop_declare_create
1420 * This function declares the llog create. It declares also name insert
1421 * into llog directory in case of named llog.
1423 * \param[in] env execution environment
1424 * \param[in] res llog handle of the current llog
1425 * \param[in] th current transaction handle
1427 * \retval 0 on successful create declaration
1428 * \retval negative value on error
1430 static int llog_osd_declare_create(const struct lu_env *env,
1431 struct llog_handle *res, struct thandle *th)
1433 struct llog_thread_info *lgi = llog_info(env);
1434 struct dt_insert_rec *rec = &lgi->lgi_dt_rec;
1435 struct local_oid_storage *los;
1436 struct dt_object *o;
1441 LASSERT(res->lgh_obj);
1444 /* object can be created by another thread */
1446 if (dt_object_exists(o))
1449 if (res->lgh_ctxt->loc_flags & LLOG_CTXT_FLAG_NORMAL_FID) {
1450 struct llog_thread_info *lgi = llog_info(env);
1452 lgi->lgi_attr.la_valid = LA_MODE | LA_SIZE;
1453 lgi->lgi_attr.la_size = 0;
1454 lgi->lgi_attr.la_mode = S_IFREG | S_IRUGO | S_IWUSR;
1455 lgi->lgi_dof.dof_type = dt_mode_to_dft(S_IFREG);
1457 rc = dt_declare_create(env, o, &lgi->lgi_attr, NULL,
1463 rc = llog_osd_regular_fid_add_name_entry(env, o, th, true);
1467 los = res->private_data;
1470 rc = llog_osd_declare_new_object(env, los, o, th);
1474 /* do not declare header initialization here as it's declared
1475 * in llog_osd_declare_write_rec() which is always called */
1477 if (res->lgh_name) {
1478 struct dt_object *llog_dir;
1480 llog_dir = llog_osd_dir_get(env, res->lgh_ctxt);
1481 if (IS_ERR(llog_dir))
1482 RETURN(PTR_ERR(llog_dir));
1483 logid_to_fid(&res->lgh_id, &lgi->lgi_fid);
1484 rec->rec_fid = &lgi->lgi_fid;
1485 rec->rec_type = S_IFREG;
1486 rc = dt_declare_insert(env, llog_dir,
1487 (struct dt_rec *)rec,
1488 (struct dt_key *)res->lgh_name, th);
1489 dt_object_put(env, llog_dir);
1491 CERROR("%s: can't declare named llog %s: rc = %d\n",
1492 o->do_lu.lo_dev->ld_obd->obd_name,
1499 * Implementation of the llog_operations::lop_create
1501 * This function creates the llog according with llog_handle::lgh_obj
1502 * and llog_handle::lgh_name.
1504 * \param[in] env execution environment
1505 * \param[in] res llog handle of the current llog
1506 * \param[in] th current transaction handle
1508 * \retval 0 on successful create
1509 * \retval negative value on error
1511 static int llog_osd_create(const struct lu_env *env, struct llog_handle *res,
1514 struct llog_thread_info *lgi = llog_info(env);
1515 struct dt_insert_rec *rec = &lgi->lgi_dt_rec;
1516 struct local_oid_storage *los;
1517 struct dt_object *o;
1526 /* llog can be already created */
1527 if (dt_object_exists(o))
1530 if (res->lgh_ctxt->loc_flags & LLOG_CTXT_FLAG_NORMAL_FID) {
1531 struct llog_thread_info *lgi = llog_info(env);
1533 lgi->lgi_attr.la_valid = LA_MODE | LA_SIZE | LA_TYPE;
1534 lgi->lgi_attr.la_size = 0;
1535 lgi->lgi_attr.la_mode = S_IFREG | S_IRUGO | S_IWUSR;
1536 lgi->lgi_dof.dof_type = dt_mode_to_dft(S_IFREG);
1538 dt_write_lock(env, o, 0);
1539 rc = dt_create(env, o, &lgi->lgi_attr, NULL,
1541 dt_write_unlock(env, o);
1545 rc = llog_osd_regular_fid_add_name_entry(env, o, th, false);
1550 los = res->private_data;
1553 dt_write_lock(env, o, 0);
1554 if (!dt_object_exists(o))
1555 rc = llog_osd_create_new_object(env, los, o, th);
1559 dt_write_unlock(env, o);
1563 if (res->lgh_name) {
1564 struct dt_object *llog_dir;
1566 llog_dir = llog_osd_dir_get(env, res->lgh_ctxt);
1567 if (IS_ERR(llog_dir))
1568 RETURN(PTR_ERR(llog_dir));
1570 logid_to_fid(&res->lgh_id, &lgi->lgi_fid);
1571 rec->rec_fid = &lgi->lgi_fid;
1572 rec->rec_type = S_IFREG;
1573 dt_read_lock(env, llog_dir, 0);
1574 rc = dt_insert(env, llog_dir, (struct dt_rec *)rec,
1575 (struct dt_key *)res->lgh_name,
1577 dt_read_unlock(env, llog_dir);
1578 dt_object_put(env, llog_dir);
1580 CERROR("%s: can't create named llog %s: rc = %d\n",
1581 o->do_lu.lo_dev->ld_obd->obd_name,
1588 * Implementation of the llog_operations::lop_close
1590 * This function closes the llog. It just put llog object and referenced
1593 * \param[in] env execution environment
1594 * \param[in] handle llog handle of the current llog
1596 * \retval 0 on successful llog close
1597 * \retval negative value on error
1599 static int llog_osd_close(const struct lu_env *env, struct llog_handle *handle)
1601 struct local_oid_storage *los;
1606 LASSERT(handle->lgh_obj);
1608 if (handle->lgh_ctxt->loc_flags & LLOG_CTXT_FLAG_NORMAL_FID) {
1609 /* Remove the object from the cache, otherwise it may
1610 * hold LOD being released during cleanup process */
1611 dt_object_put_nocache(env, handle->lgh_obj);
1612 LASSERT(handle->private_data == NULL);
1615 dt_object_put(env, handle->lgh_obj);
1617 los = handle->private_data;
1621 if (handle->lgh_name)
1622 OBD_FREE(handle->lgh_name, strlen(handle->lgh_name) + 1);
1628 * delete llog object name entry
1630 * Delete llog object (with regular FID) from name space (under
1633 * \param [in] env execution environment
1634 * \param [in] dto llog object
1635 * \param [in] th thandle
1636 * \param [in] declare if it is declare or execution
1638 * \retval 0 if deletion succeeds.
1639 * \retval negative errno if deletion fails.
1642 llog_osd_regular_fid_del_name_entry(const struct lu_env *env,
1643 struct dt_object *dto,
1644 struct thandle *th, bool declare)
1646 struct llog_thread_info *lgi = llog_info(env);
1647 const struct lu_fid *fid = lu_object_fid(&dto->do_lu);
1648 struct dt_object *dir;
1649 char *name = lgi->lgi_name;
1653 if (!fid_is_norm(fid))
1656 dir = llog_osd_get_regular_fid_dir(env, dto);
1658 RETURN(PTR_ERR(dir));
1660 snprintf(name, sizeof(lgi->lgi_name), DFID, PFID(fid));
1661 dt_write_lock(env, dir, 0);
1663 rc = dt_declare_delete(env, dir, (struct dt_key *)name,
1666 rc = dt_delete(env, dir, (struct dt_key *)name, th);
1668 dt_write_unlock(env, dir);
1670 dt_object_put(env, dir);
1675 * Implementation of the llog_operations::lop_declare_destroy
1677 * This function declare destroys the llog and deletes also entry in the
1678 * llog directory in case of named llog. Llog should be opened prior that.
1680 * \param[in] env execution environment
1681 * \param[in] loghandle llog handle of the current llog
1683 * \retval 0 on successful destroy
1684 * \retval negative value on error
1686 static int llog_osd_declare_destroy(const struct lu_env *env,
1687 struct llog_handle *loghandle,
1690 struct llog_ctxt *ctxt;
1691 struct dt_object *o, *llog_dir = NULL;
1696 ctxt = loghandle->lgh_ctxt;
1699 o = loghandle->lgh_obj;
1702 if (loghandle->lgh_name) {
1703 llog_dir = llog_osd_dir_get(env, ctxt);
1704 if (IS_ERR(llog_dir))
1705 RETURN(PTR_ERR(llog_dir));
1707 rc = dt_declare_delete(env, llog_dir,
1708 (struct dt_key *)loghandle->lgh_name,
1714 rc = dt_declare_ref_del(env, o, th);
1718 rc = dt_declare_destroy(env, o, th);
1722 if (loghandle->lgh_ctxt->loc_flags & LLOG_CTXT_FLAG_NORMAL_FID) {
1723 rc = llog_osd_regular_fid_del_name_entry(env, o, th, true);
1729 if (!(IS_ERR_OR_NULL(llog_dir)))
1730 dt_object_put(env, llog_dir);
1737 * Implementation of the llog_operations::lop_destroy
1739 * This function destroys the llog and deletes also entry in the
1740 * llog directory in case of named llog. Llog should be opened prior that.
1741 * Destroy method is not part of external transaction and does everything
1744 * \param[in] env execution environment
1745 * \param[in] loghandle llog handle of the current llog
1747 * \retval 0 on successful destroy
1748 * \retval negative value on error
1750 static int llog_osd_destroy(const struct lu_env *env,
1751 struct llog_handle *loghandle, struct thandle *th)
1753 struct llog_ctxt *ctxt;
1754 struct dt_object *o, *llog_dir = NULL;
1759 ctxt = loghandle->lgh_ctxt;
1760 LASSERT(ctxt != NULL);
1762 o = loghandle->lgh_obj;
1765 dt_write_lock(env, o, 0);
1766 if (!dt_object_exists(o))
1767 GOTO(out_unlock, rc = 0);
1769 if (loghandle->lgh_name) {
1770 llog_dir = llog_osd_dir_get(env, ctxt);
1771 if (IS_ERR(llog_dir))
1772 GOTO(out_unlock, rc = PTR_ERR(llog_dir));
1774 dt_read_lock(env, llog_dir, 0);
1775 rc = dt_delete(env, llog_dir,
1776 (struct dt_key *)loghandle->lgh_name,
1778 dt_read_unlock(env, llog_dir);
1780 CERROR("%s: can't remove llog %s: rc = %d\n",
1781 o->do_lu.lo_dev->ld_obd->obd_name,
1782 loghandle->lgh_name, rc);
1783 GOTO(out_unlock, rc);
1787 dt_ref_del(env, o, th);
1788 rc = dt_destroy(env, o, th);
1790 GOTO(out_unlock, rc);
1792 if (loghandle->lgh_ctxt->loc_flags & LLOG_CTXT_FLAG_NORMAL_FID) {
1793 rc = llog_osd_regular_fid_del_name_entry(env, o, th, false);
1795 GOTO(out_unlock, rc);
1799 dt_write_unlock(env, o);
1800 if (!(IS_ERR_OR_NULL(llog_dir)))
1801 dt_object_put(env, llog_dir);
1806 * Implementation of the llog_operations::lop_setup
1808 * This function setup the llog on local storage.
1810 * \param[in] env execution environment
1811 * \param[in] obd obd device the llog belongs to
1812 * \param[in] olg the llog group, it is always zero group now.
1813 * \param[in] ctxt_idx the llog index, it defines the purpose of this llog.
1814 * Every new llog type have to use own index.
1815 * \param[in] disk_obd the storage obd, where llog is stored.
1817 * \retval 0 on successful llog setup
1818 * \retval negative value on error
1820 static int llog_osd_setup(const struct lu_env *env, struct obd_device *obd,
1821 struct obd_llog_group *olg, int ctxt_idx,
1822 struct obd_device *disk_obd)
1824 struct llog_thread_info *lgi = llog_info(env);
1825 struct llog_ctxt *ctxt;
1830 LASSERT(olg->olg_ctxts[ctxt_idx]);
1832 ctxt = llog_ctxt_get(olg->olg_ctxts[ctxt_idx]);
1835 if (disk_obd == NULL)
1838 /* initialize data allowing to generate new fids,
1839 * literally we need a sequece */
1840 lgi->lgi_fid.f_seq = FID_SEQ_LLOG;
1841 lgi->lgi_fid.f_oid = 1;
1842 lgi->lgi_fid.f_ver = 0;
1843 rc = local_oid_storage_init(env, disk_obd->obd_lvfs_ctxt.dt,
1845 &ctxt->loc_los_nameless);
1849 lgi->lgi_fid.f_seq = FID_SEQ_LLOG_NAME;
1850 lgi->lgi_fid.f_oid = 1;
1851 lgi->lgi_fid.f_ver = 0;
1852 rc = local_oid_storage_init(env, disk_obd->obd_lvfs_ctxt.dt,
1854 &ctxt->loc_los_named);
1856 local_oid_storage_fini(env, ctxt->loc_los_nameless);
1857 ctxt->loc_los_nameless = NULL;
1863 llog_ctxt_put(ctxt);
1868 * Implementation of the llog_operations::lop_cleanup
1870 * This function cleanups the llog on local storage.
1872 * \param[in] env execution environment
1873 * \param[in] ctxt the llog context
1877 static int llog_osd_cleanup(const struct lu_env *env, struct llog_ctxt *ctxt)
1879 if (ctxt->loc_los_nameless != NULL) {
1880 local_oid_storage_fini(env, ctxt->loc_los_nameless);
1881 ctxt->loc_los_nameless = NULL;
1884 if (ctxt->loc_los_named != NULL) {
1885 local_oid_storage_fini(env, ctxt->loc_los_named);
1886 ctxt->loc_los_named = NULL;
1892 struct llog_operations llog_osd_ops = {
1893 .lop_next_block = llog_osd_next_block,
1894 .lop_prev_block = llog_osd_prev_block,
1895 .lop_read_header = llog_osd_read_header,
1896 .lop_declare_destroy = llog_osd_declare_destroy,
1897 .lop_destroy = llog_osd_destroy,
1898 .lop_setup = llog_osd_setup,
1899 .lop_cleanup = llog_osd_cleanup,
1900 .lop_open = llog_osd_open,
1901 .lop_exist = llog_osd_exist,
1902 .lop_declare_create = llog_osd_declare_create,
1903 .lop_create = llog_osd_create,
1904 .lop_declare_write_rec = llog_osd_declare_write_rec,
1905 .lop_write_rec = llog_osd_write_rec,
1906 .lop_close = llog_osd_close,
1908 EXPORT_SYMBOL(llog_osd_ops);
1910 struct llog_operations llog_common_cat_ops = {
1911 .lop_next_block = llog_osd_next_block,
1912 .lop_prev_block = llog_osd_prev_block,
1913 .lop_read_header = llog_osd_read_header,
1914 .lop_declare_destroy = llog_osd_declare_destroy,
1915 .lop_destroy = llog_osd_destroy,
1916 .lop_setup = llog_osd_setup,
1917 .lop_cleanup = llog_osd_cleanup,
1918 .lop_open = llog_osd_open,
1919 .lop_exist = llog_osd_exist,
1920 .lop_declare_create = llog_osd_declare_create,
1921 .lop_create = llog_osd_create,
1922 .lop_declare_write_rec = llog_osd_declare_write_rec,
1923 .lop_write_rec = llog_osd_write_rec,
1924 .lop_close = llog_osd_close,
1925 .lop_add = llog_cat_add_rec,
1926 .lop_declare_add = llog_cat_declare_add_rec,
1928 EXPORT_SYMBOL(llog_common_cat_ops);
1931 * Read the special file which contains the list of llog catalogs IDs
1933 * This function reads the CATALOGS file which contains the array of llog
1934 * catalogs IDs. The main purpose of this file is to store OSP llogs indexed
1935 * by OST/MDT number.
1937 * \param[in] env execution environment
1938 * \param[in] d corresponding storage device
1939 * \param[in] idx position to start from, usually OST/MDT index
1940 * \param[in] count how many catalog IDs to read
1941 * \param[out] idarray the buffer for the data. If it is NULL then
1942 * function returns just number of catalog IDs
1944 * \param[in] fid LLOG_CATALOGS_OID for CATALOG object
1946 * \retval 0 on successful read of catalog IDs
1947 * \retval negative value on error
1948 * \retval positive value which is number of records in
1949 * the file if \a idarray is NULL
1951 int llog_osd_get_cat_list(const struct lu_env *env, struct dt_device *d,
1952 int idx, int count, struct llog_catid *idarray,
1953 const struct lu_fid *fid)
1955 struct llog_thread_info *lgi = llog_info(env);
1956 struct dt_object *o = NULL;
1964 size = sizeof(*idarray) * count;
1965 lgi->lgi_off = idx * sizeof(*idarray);
1967 lgi->lgi_fid = *fid;
1968 o = dt_locate(env, d, &lgi->lgi_fid);
1972 if (!dt_object_exists(o)) {
1973 th = dt_trans_create(env, d);
1975 GOTO(out, rc = PTR_ERR(th));
1977 lgi->lgi_attr.la_valid = LA_MODE;
1978 lgi->lgi_attr.la_mode = S_IFREG | S_IRUGO | S_IWUSR;
1979 lgi->lgi_dof.dof_type = dt_mode_to_dft(S_IFREG);
1981 th->th_wait_submit = 1;
1982 /* Make the llog object creation synchronization, so
1983 * it will be reliable to the reference, especially
1984 * for remote reference */
1987 rc = dt_declare_create(env, o, &lgi->lgi_attr, NULL,
1990 GOTO(out_trans, rc);
1992 rc = dt_trans_start_local(env, d, th);
1994 GOTO(out_trans, rc);
1996 dt_write_lock(env, o, 0);
1997 if (!dt_object_exists(o))
1998 rc = dt_create(env, o, &lgi->lgi_attr, NULL,
2000 dt_write_unlock(env, o);
2002 dt_trans_stop(env, d, th);
2007 rc = dt_attr_get(env, o, &lgi->lgi_attr);
2011 if (!S_ISREG(lgi->lgi_attr.la_mode)) {
2012 CERROR("%s: CATALOGS is not a regular file!: mode = %o\n",
2013 o->do_lu.lo_dev->ld_obd->obd_name,
2014 lgi->lgi_attr.la_mode);
2015 GOTO(out, rc = -ENOENT);
2018 CDEBUG(D_CONFIG, "cat list: disk size=%d, read=%d\n",
2019 (int)lgi->lgi_attr.la_size, size);
2021 /* return just number of llogs */
2022 if (idarray == NULL) {
2023 rc = lgi->lgi_attr.la_size / sizeof(*idarray);
2027 /* read for new ost index or for empty file */
2028 memset(idarray, 0, size);
2029 if (lgi->lgi_attr.la_size <= lgi->lgi_off)
2031 if (lgi->lgi_attr.la_size < lgi->lgi_off + size)
2032 size = lgi->lgi_attr.la_size - lgi->lgi_off;
2034 lgi->lgi_buf.lb_buf = idarray;
2035 lgi->lgi_buf.lb_len = size;
2036 rc = dt_record_read(env, o, &lgi->lgi_buf, &lgi->lgi_off);
2037 /* -EFAULT means the llog is a sparse file. This is not an error
2038 * after arbitrary OST index is supported. */
2039 if (rc < 0 && rc != -EFAULT) {
2040 CERROR("%s: error reading CATALOGS: rc = %d\n",
2041 o->do_lu.lo_dev->ld_obd->obd_name, rc);
2047 dt_object_put(env, o);
2050 EXPORT_SYMBOL(llog_osd_get_cat_list);
2053 * Write the special file which contains the list of llog catalogs IDs
2055 * This function writes the CATALOG file which contains the array of llog
2056 * catalogs IDs. It is used mostly to store OSP llogs indexed by OST/MDT
2059 * \param[in] env execution environment
2060 * \param[in] d corresponding storage device
2061 * \param[in] idx position to start from, usually OST/MDT index
2062 * \param[in] count how many catalog IDs to write
2063 * \param[out] idarray the buffer with the data to write.
2064 * \param[in] fid LLOG_CATALOGS_OID for CATALOG object
2066 * \retval 0 on successful write of catalog IDs
2067 * \retval negative value on error
2069 int llog_osd_put_cat_list(const struct lu_env *env, struct dt_device *d,
2070 int idx, int count, struct llog_catid *idarray,
2071 const struct lu_fid *fid)
2073 struct llog_thread_info *lgi = llog_info(env);
2074 struct dt_object *o = NULL;
2083 size = sizeof(*idarray) * count;
2084 lgi->lgi_off = idx * sizeof(*idarray);
2085 lgi->lgi_fid = *fid;
2087 o = dt_locate(env, d, &lgi->lgi_fid);
2091 if (!dt_object_exists(o))
2092 GOTO(out, rc = -ENOENT);
2094 rc = dt_attr_get(env, o, &lgi->lgi_attr);
2098 if (!S_ISREG(lgi->lgi_attr.la_mode)) {
2099 CERROR("%s: CATALOGS is not a regular file!: mode = %o\n",
2100 o->do_lu.lo_dev->ld_obd->obd_name,
2101 lgi->lgi_attr.la_mode);
2102 GOTO(out, rc = -ENOENT);
2105 th = dt_trans_create(env, d);
2107 GOTO(out, rc = PTR_ERR(th));
2109 lgi->lgi_buf.lb_len = size;
2110 lgi->lgi_buf.lb_buf = idarray;
2111 rc = dt_declare_record_write(env, o, &lgi->lgi_buf, lgi->lgi_off, th);
2113 GOTO(out_trans, rc);
2115 /* For update log, this happens during initialization,
2116 * see lod_sub_prep_llog(), and we need make sure catlog
2117 * file ID is written to catlist file(committed) before
2118 * cross-MDT operation write update records to catlog FILE,
2119 * otherwise, during failover these update records might
2121 if (fid_is_update_log(fid))
2124 rc = dt_trans_start_local(env, d, th);
2126 GOTO(out_trans, rc);
2128 th->th_wait_submit = 1;
2130 rc = dt_record_write(env, o, &lgi->lgi_buf, &lgi->lgi_off, th);
2132 CDEBUG(D_INODE, "can't write CATALOGS at index %d: rc = %d\n",
2135 dt_trans_stop(env, d, th);
2137 dt_object_put(env, o);
2140 EXPORT_SYMBOL(llog_osd_put_cat_list);