4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2012, Whamcloud, Inc.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/include/lustre_log.h
38 * Generic infrastructure for managing a collection of logs.
39 * These logs are used for:
41 * - orphan recovery: OST adds record on create
42 * - mtime/size consistency: the OST adds a record on first write
43 * - open/unlinked objects: OST adds a record on destroy
45 * - mds unlink log: the MDS adds an entry upon delete
47 * - raid1 replication log between OST's
48 * - MDS replication logs
59 #if defined(__linux__)
60 #include <linux/lustre_log.h>
61 #elif defined(__APPLE__)
62 #include <darwin/lustre_log.h>
63 #elif defined(__WINNT__)
64 #include <winnt/lustre_log.h>
66 #error Unsupported operating system.
69 #include <obd_class.h>
71 #include <lustre/lustre_idl.h>
72 #include <dt_object.h>
74 #define LOG_NAME_LIMIT(logname, name) \
75 snprintf(logname, sizeof(logname), "LOGS/%s", name)
76 #define LLOG_EEMPTY 4711
78 enum llog_open_param {
79 LLOG_OPEN_EXISTS = 0x0000,
80 LLOG_OPEN_NEW = 0x0001,
83 struct plain_handle_data {
85 struct llog_handle *phd_cat_handle;
86 struct llog_cookie phd_cookie; /* cookie of this log in its cat */
89 struct cat_handle_data {
91 struct llog_handle *chd_current_log; /* currently open log */
92 struct llog_handle *chd_next_log; /* llog to be used next */
95 static inline void logid_to_fid(struct llog_logid *id, struct lu_fid *fid)
97 /* For compatibility purposes we identify pre-OSD (~< 2.3.51 MDS)
98 * logid's by non-zero ogen (inode generation) and convert them
100 if (id->lgl_ogen == 0) {
101 fid->f_seq = id->lgl_oseq;
102 fid->f_oid = id->lgl_oid;
105 lu_igif_build(fid, id->lgl_oid, id->lgl_ogen);
109 static inline void fid_to_logid(struct lu_fid *fid, struct llog_logid *id)
111 id->lgl_oseq = fid->f_seq;
112 id->lgl_oid = fid->f_oid;
118 /* llog.c - general API */
119 typedef int (*llog_cb_t)(const struct lu_env *env, struct llog_handle *lgh,
120 struct llog_rec_hdr *rec, void *data);
121 int llog_init_handle(const struct lu_env *env, struct llog_handle *handle,
122 int flags, struct obd_uuid *uuid);
123 int llog_process(const struct lu_env *env, struct llog_handle *loghandle,
124 llog_cb_t cb, void *data, void *catdata);
125 int llog_process_or_fork(const struct lu_env *env,
126 struct llog_handle *loghandle,
127 llog_cb_t cb, void *data, void *catdata, bool fork);
128 int llog_reverse_process(const struct lu_env *env,
129 struct llog_handle *loghandle, llog_cb_t cb,
130 void *data, void *catdata);
131 int llog_cancel_rec(const struct lu_env *env, struct llog_handle *loghandle,
133 int llog_open(const struct lu_env *env, struct llog_ctxt *ctxt,
134 struct llog_handle **lgh, struct llog_logid *logid,
135 char *name, enum llog_open_param open_param);
136 int llog_close(const struct lu_env *env, struct llog_handle *cathandle);
137 int llog_get_size(struct llog_handle *loghandle);
139 /* llog_process flags */
140 #define LLOG_FLAG_NODEAMON 0x0001
142 /* llog_cat.c - catalog api */
143 struct llog_process_data {
145 * Any useful data needed while processing catalog. This is
146 * passed later to process callback.
150 * Catalog process callback function, called for each record
155 * Start processing the catalog from startcat/startidx
161 struct llog_process_cat_data {
163 * Temporary stored first_idx while scanning log.
167 * Temporary stored last_idx while scanning log.
172 struct llog_process_cat_args {
174 * Llog context used in recovery thread on OST (recov_thread.c)
176 struct llog_ctxt *lpca_ctxt;
178 * Llog callback used in recovery thread on OST (recov_thread.c)
182 * Data pointer for llog callback.
187 int cat_cancel_cb(const struct lu_env *env, struct llog_handle *cathandle,
188 struct llog_rec_hdr *rec, void *data);
189 int llog_cat_close(const struct lu_env *env, struct llog_handle *cathandle);
190 int llog_cat_add_rec(const struct lu_env *env, struct llog_handle *cathandle,
191 struct llog_rec_hdr *rec, struct llog_cookie *reccookie,
193 int llog_cat_cancel_records(const struct lu_env *env,
194 struct llog_handle *cathandle, int count,
195 struct llog_cookie *cookies);
196 int __llog_cat_process(const struct lu_env *env, struct llog_handle *cat_llh,
197 llog_cb_t cb, void *data, int startcat, int startidx,
199 int llog_cat_process(const struct lu_env *env, struct llog_handle *cat_llh,
200 llog_cb_t cb, void *data, int startcat, int startidx);
201 int llog_cat_process_thread(void *data);
202 int llog_cat_reverse_process(const struct lu_env *env,
203 struct llog_handle *cat_llh, llog_cb_t cb,
205 int llog_cat_set_first_idx(struct llog_handle *cathandle, int index);
208 int llog_setup_named(struct obd_device *obd, struct obd_llog_group *olg,
209 int index, struct obd_device *disk_obd, int count,
210 struct llog_logid *logid, const char *logname,
211 struct llog_operations *op);
212 int llog_setup(struct obd_device *obd, struct obd_llog_group *olg, int index,
213 struct obd_device *disk_obd, int count, struct llog_logid *logid,
214 struct llog_operations *op);
215 int __llog_ctxt_put(struct llog_ctxt *ctxt);
216 int llog_cleanup(struct llog_ctxt *);
217 int llog_sync(struct llog_ctxt *ctxt, struct obd_export *exp, int flags);
218 int llog_add(const struct lu_env *env, struct llog_ctxt *ctxt,
219 struct llog_rec_hdr *rec, struct lov_stripe_md *lsm,
220 struct llog_cookie *logcookies, int numcookies);
221 int llog_cancel(const struct lu_env *env, struct llog_ctxt *ctxt,
222 struct lov_stripe_md *lsm, int count,
223 struct llog_cookie *cookies, int flags);
224 int llog_obd_origin_setup(const struct lu_env *env, struct obd_device *obd,
225 struct obd_llog_group *olg, int index,
226 struct obd_device *disk_obd, int count,
227 struct llog_logid *logid, const char *name);
228 int llog_obd_origin_cleanup(const struct lu_env *env, struct llog_ctxt *ctxt);
229 int llog_obd_origin_add(const struct lu_env *env, struct llog_ctxt *ctxt,
230 struct llog_rec_hdr *rec, struct lov_stripe_md *lsm,
231 struct llog_cookie *logcookies, int numcookies);
233 int obd_llog_init(struct obd_device *obd, struct obd_llog_group *olg,
234 struct obd_device *disk_obd, int *idx);
236 int obd_llog_finish(struct obd_device *obd, int count);
239 int llog_ioctl(struct llog_ctxt *ctxt, int cmd, struct obd_ioctl_data *data);
240 int llog_catalog_list(struct obd_device *obd, int count,
241 struct obd_ioctl_data *data);
244 int llog_initiator_connect(struct llog_ctxt *ctxt);
245 int llog_receptor_accept(struct llog_ctxt *ctxt, struct obd_import *imp);
246 int llog_origin_connect(struct llog_ctxt *ctxt,
247 struct llog_logid *logid, struct llog_gen *gen,
248 struct obd_uuid *uuid);
249 int llog_handle_connect(struct ptlrpc_request *req);
252 int llog_obd_repl_cancel(const struct lu_env *env, struct llog_ctxt *ctxt,
253 struct lov_stripe_md *lsm, int count,
254 struct llog_cookie *cookies, int flags);
255 int llog_obd_repl_sync(struct llog_ctxt *ctxt, struct obd_export *exp,
257 int llog_obd_repl_connect(struct llog_ctxt *ctxt,
258 struct llog_logid *logid, struct llog_gen *gen,
259 struct obd_uuid *uuid);
261 struct llog_operations {
262 int (*lop_destroy)(const struct lu_env *env,
263 struct llog_handle *handle);
264 int (*lop_next_block)(const struct lu_env *env, struct llog_handle *h,
265 int *curr_idx, int next_idx, __u64 *offset,
267 int (*lop_prev_block)(const struct lu_env *env, struct llog_handle *h,
268 int prev_idx, void *buf, int len);
269 int (*lop_read_header)(const struct lu_env *env,
270 struct llog_handle *handle);
271 int (*lop_setup)(const struct lu_env *env, struct obd_device *obd,
272 struct obd_llog_group *olg, int ctxt_idx,
273 struct obd_device *disk_obd, int count,
274 struct llog_logid *logid, const char *name);
275 int (*lop_sync)(struct llog_ctxt *ctxt, struct obd_export *exp,
277 int (*lop_cleanup)(const struct lu_env *env, struct llog_ctxt *ctxt);
278 int (*lop_cancel)(const struct lu_env *env, struct llog_ctxt *ctxt,
279 struct lov_stripe_md *lsm, int count,
280 struct llog_cookie *cookies, int flags);
281 int (*lop_connect)(struct llog_ctxt *ctxt, struct llog_logid *logid,
282 struct llog_gen *gen, struct obd_uuid *uuid);
284 * Any llog file must be opened first using llog_open(). Llog can be
285 * opened by name, logid or without both, in last case the new logid
288 int (*lop_open)(const struct lu_env *env, struct llog_handle *lgh,
289 struct llog_logid *logid, char *name,
290 enum llog_open_param);
292 * Opened llog may not exist and this must be checked where needed using
293 * the llog_exist() call.
295 int (*lop_exist)(struct llog_handle *lgh);
297 * Close llog file and calls llog_free_handle() implicitly.
298 * Any opened llog must be closed by llog_close() call.
300 int (*lop_close)(const struct lu_env *env, struct llog_handle *handle);
302 * Create new llog file. The llog must be opened.
303 * Must be used only for local llog operations.
305 int (*lop_declare_create)(const struct lu_env *env,
306 struct llog_handle *handle,
308 int (*lop_create)(const struct lu_env *env, struct llog_handle *handle,
311 * write new record in llog. It appends records usually but can edit
312 * existing records too.
314 int (*lop_write_rec)(const struct lu_env *env,
315 struct llog_handle *loghandle,
316 struct llog_rec_hdr *rec,
317 struct llog_cookie *logcookies, int numcookies,
320 * Add new record in llog catalog. Does the same as llog_write_rec()
321 * but using llog catalog.
323 int (*lop_add)(const struct lu_env *env, struct llog_ctxt *ctxt,
324 struct llog_rec_hdr *rec, struct lov_stripe_md *lsm,
325 struct llog_cookie *logcookies, int numcookies);
328 /* In-memory descriptor for a log object or log catalog */
330 cfs_rw_semaphore_t lgh_lock;
331 cfs_spinlock_t lgh_hdr_lock; /* protect lgh_hdr data */
332 struct llog_logid lgh_id; /* id of this log */
333 struct llog_log_hdr *lgh_hdr;
334 struct file *lgh_file;
335 struct dt_object *lgh_obj;
337 int lgh_cur_idx; /* used during llog_process */
338 __u64 lgh_cur_offset; /* used during llog_process */
339 struct llog_ctxt *lgh_ctxt;
341 struct plain_handle_data phd;
342 struct cat_handle_data chd;
346 struct llog_operations *lgh_logops;
350 extern struct llog_operations llog_lvfs_ops;
351 int llog_get_cat_list(struct obd_device *disk_obd,
352 char *name, int idx, int count,
353 struct llog_catid *idarray);
355 int llog_put_cat_list(struct obd_device *disk_obd,
356 char *name, int idx, int count, struct llog_catid *idarray);
358 #define LLOG_CTXT_FLAG_UNINITIALIZED 0x00000001
359 #define LLOG_CTXT_FLAG_STOP 0x00000002
362 int loc_idx; /* my index the obd array of ctxt's */
363 struct llog_gen loc_gen;
364 struct obd_device *loc_obd; /* points back to the containing obd*/
365 struct obd_llog_group *loc_olg; /* group containing that ctxt */
366 struct obd_export *loc_exp; /* parent "disk" export (e.g. MDS) */
367 struct obd_import *loc_imp; /* to use in RPC's: can be backward
369 struct llog_operations *loc_logops;
370 struct llog_handle *loc_handle;
371 struct llog_commit_master *loc_lcm;
372 struct llog_canceld_ctxt *loc_llcd;
373 cfs_mutex_t loc_mutex; /* protects loc_llcd and loc_imp */
374 cfs_atomic_t loc_refcount;
376 long loc_flags; /* flags, see above defines */
377 struct dt_object *loc_dir;
380 #define LCM_NAME_SIZE 64
382 struct llog_commit_master {
384 * Thread control flags (start, stop, etc.)
388 * Number of llcds onthis lcm.
390 cfs_atomic_t lcm_count;
392 * The refcount for lcm
394 cfs_atomic_t lcm_refcount;
396 * Thread control structure. Used for control commit thread.
398 struct ptlrpcd_ctl lcm_pc;
400 * Lock protecting list of llcds.
402 cfs_spinlock_t lcm_lock;
404 * Llcds in flight for debugging purposes.
406 cfs_list_t lcm_llcds;
408 * Commit thread name buffer. Only used for thread start.
410 char lcm_name[LCM_NAME_SIZE];
413 static inline struct llog_commit_master
414 *lcm_get(struct llog_commit_master *lcm)
416 cfs_atomic_inc(&lcm->lcm_refcount);
421 lcm_put(struct llog_commit_master *lcm)
423 LASSERT_ATOMIC_POS(&lcm->lcm_refcount);
424 if (cfs_atomic_dec_and_test(&lcm->lcm_refcount))
428 struct llog_canceld_ctxt {
430 * Llog context this llcd is attached to. Used for accessing
431 * ->loc_import and others in process of canceling cookies
432 * gathered in this llcd.
434 struct llog_ctxt *llcd_ctxt;
436 * Cancel thread control stucture pointer. Used for accessing
437 * it to see if should stop processing and other needs.
439 struct llog_commit_master *llcd_lcm;
441 * Maximal llcd size. Used in calculations on how much of room
442 * left in llcd to cookie comming cookies.
446 * Link to lcm llcds list.
448 cfs_list_t llcd_list;
450 * Current llcd size while gathering cookies. This should not be
451 * more than ->llcd_size. Used for determining if we need to
452 * send this llcd (if full) and allocate new one. This is also
453 * used for copying new cookie at the end of buffer.
455 int llcd_cookiebytes;
457 * Pointer to the start of cookies buffer.
459 struct llog_cookie llcd_cookies[0];
462 /* ptlrpc/recov_thread.c */
463 extern struct llog_commit_master *llog_recov_thread_init(char *name);
464 extern void llog_recov_thread_fini(struct llog_commit_master *lcm,
466 extern int llog_recov_thread_start(struct llog_commit_master *lcm);
467 extern void llog_recov_thread_stop(struct llog_commit_master *lcm,
470 static inline void llog_gen_init(struct llog_ctxt *ctxt)
472 struct obd_device *obd = ctxt->loc_exp->exp_obd;
474 LASSERTF(obd->u.obt.obt_magic == OBT_MAGIC,
475 "%s: wrong obt magic %#x\n",
476 obd->obd_name, obd->u.obt.obt_magic);
477 ctxt->loc_gen.mnt_cnt = obd->u.obt.obt_mount_count;
478 ctxt->loc_gen.conn_cnt++;
481 static inline int llog_gen_lt(struct llog_gen a, struct llog_gen b)
483 if (a.mnt_cnt < b.mnt_cnt)
485 if (a.mnt_cnt > b.mnt_cnt)
487 return(a.conn_cnt < b.conn_cnt ? 1 : 0);
490 #define LLOG_PROC_BREAK 0x0001
491 #define LLOG_DEL_RECORD 0x0002
493 static inline int llog_obd2ops(struct llog_ctxt *ctxt,
494 struct llog_operations **lop)
499 *lop = ctxt->loc_logops;
506 static inline int llog_handle2ops(struct llog_handle *loghandle,
507 struct llog_operations **lop)
509 if (loghandle == NULL || loghandle->lgh_logops == NULL)
512 *lop = loghandle->lgh_logops;
516 static inline int llog_data_len(int len)
518 return cfs_size_round(len);
521 static inline struct llog_ctxt *llog_ctxt_get(struct llog_ctxt *ctxt)
523 cfs_atomic_inc(&ctxt->loc_refcount);
524 CDEBUG(D_INFO, "GETting ctxt %p : new refcount %d\n", ctxt,
525 cfs_atomic_read(&ctxt->loc_refcount));
529 static inline void llog_ctxt_put(struct llog_ctxt *ctxt)
533 LASSERT_ATOMIC_GT_LT(&ctxt->loc_refcount, 0, LI_POISON);
534 CDEBUG(D_INFO, "PUTting ctxt %p : new refcount %d\n", ctxt,
535 cfs_atomic_read(&ctxt->loc_refcount) - 1);
536 __llog_ctxt_put(ctxt);
539 static inline void llog_group_init(struct obd_llog_group *olg, int group)
541 cfs_waitq_init(&olg->olg_waitq);
542 cfs_spin_lock_init(&olg->olg_lock);
543 cfs_mutex_init(&olg->olg_cat_processing);
544 olg->olg_seq = group;
547 static inline void llog_group_set_export(struct obd_llog_group *olg,
548 struct obd_export *exp)
550 LASSERT(exp != NULL);
552 cfs_spin_lock(&olg->olg_lock);
553 if (olg->olg_exp != NULL && olg->olg_exp != exp)
554 CWARN("%s: export for group %d is changed: 0x%p -> 0x%p\n",
555 exp->exp_obd->obd_name, olg->olg_seq,
558 cfs_spin_unlock(&olg->olg_lock);
561 static inline int llog_group_set_ctxt(struct obd_llog_group *olg,
562 struct llog_ctxt *ctxt, int index)
564 LASSERT(index >= 0 && index < LLOG_MAX_CTXTS);
566 cfs_spin_lock(&olg->olg_lock);
567 if (olg->olg_ctxts[index] != NULL) {
568 cfs_spin_unlock(&olg->olg_lock);
571 olg->olg_ctxts[index] = ctxt;
572 cfs_spin_unlock(&olg->olg_lock);
576 static inline struct llog_ctxt *llog_group_get_ctxt(struct obd_llog_group *olg,
579 struct llog_ctxt *ctxt;
581 LASSERT(index >= 0 && index < LLOG_MAX_CTXTS);
583 cfs_spin_lock(&olg->olg_lock);
584 if (olg->olg_ctxts[index] == NULL) {
587 ctxt = llog_ctxt_get(olg->olg_ctxts[index]);
589 cfs_spin_unlock(&olg->olg_lock);
593 static inline struct llog_ctxt *llog_get_context(struct obd_device *obd,
596 return llog_group_get_ctxt(&obd->obd_olg, index);
599 static inline int llog_group_ctxt_null(struct obd_llog_group *olg, int index)
601 return (olg->olg_ctxts[index] == NULL);
604 static inline int llog_ctxt_null(struct obd_device *obd, int index)
606 return (llog_group_ctxt_null(&obd->obd_olg, index));
609 static inline int llog_write_rec(const struct lu_env *env,
610 struct llog_handle *handle,
611 struct llog_rec_hdr *rec,
612 struct llog_cookie *logcookies,
613 int numcookies, void *buf, int idx)
615 struct llog_operations *lop;
616 int raised, rc, buflen;
620 rc = llog_handle2ops(handle, &lop);
624 if (lop->lop_write_rec == NULL)
627 /* FIXME: Why doesn't caller just set the right lrh_len itself? */
629 buflen = rec->lrh_len + sizeof(struct llog_rec_hdr) +
630 sizeof(struct llog_rec_tail);
632 buflen = rec->lrh_len;
633 LASSERT(cfs_size_round(buflen) == buflen);
635 raised = cfs_cap_raised(CFS_CAP_SYS_RESOURCE);
637 cfs_cap_raise(CFS_CAP_SYS_RESOURCE);
638 rc = lop->lop_write_rec(env, handle, rec, logcookies, numcookies,
641 cfs_cap_lower(CFS_CAP_SYS_RESOURCE);
645 static inline int llog_destroy(const struct lu_env *env,
646 struct llog_handle *handle)
648 struct llog_operations *lop;
653 rc = llog_handle2ops(handle, &lop);
656 if (lop->lop_destroy == NULL)
659 rc = lop->lop_destroy(env, handle);
663 static inline int llog_next_block(const struct lu_env *env,
664 struct llog_handle *loghandle, int *cur_idx,
665 int next_idx, __u64 *cur_offset, void *buf,
668 struct llog_operations *lop;
673 rc = llog_handle2ops(loghandle, &lop);
676 if (lop->lop_next_block == NULL)
679 rc = lop->lop_next_block(env, loghandle, cur_idx, next_idx,
680 cur_offset, buf, len);
684 static inline int llog_prev_block(const struct lu_env *env,
685 struct llog_handle *loghandle,
686 int prev_idx, void *buf, int len)
688 struct llog_operations *lop;
693 rc = llog_handle2ops(loghandle, &lop);
696 if (lop->lop_prev_block == NULL)
699 rc = lop->lop_prev_block(env, loghandle, prev_idx, buf, len);
703 static inline int llog_connect(struct llog_ctxt *ctxt,
704 struct llog_logid *logid, struct llog_gen *gen,
705 struct obd_uuid *uuid)
707 struct llog_operations *lop;
712 rc = llog_obd2ops(ctxt, &lop);
715 if (lop->lop_connect == NULL)
718 rc = lop->lop_connect(ctxt, logid, gen, uuid);
726 * llog_open - open llog, may not exist
727 * llog_exist - check if llog exists
728 * llog_close - close opened llog, pair for open, frees llog_handle
729 * llog_declare_create - declare llog creation
730 * llog_create - create new llog on disk, need transaction handle
732 static inline int llog_exist(struct llog_handle *loghandle)
734 struct llog_operations *lop;
739 rc = llog_handle2ops(loghandle, &lop);
742 if (lop->lop_exist == NULL)
744 raised = cfs_cap_raised(CFS_CAP_SYS_RESOURCE);
746 cfs_cap_raise(CFS_CAP_SYS_RESOURCE);
747 rc = lop->lop_exist(loghandle);
749 cfs_cap_lower(CFS_CAP_SYS_RESOURCE);
753 static inline int llog_declare_create(const struct lu_env *env,
754 struct llog_handle *loghandle,
757 struct llog_operations *lop;
762 rc = llog_handle2ops(loghandle, &lop);
765 if (lop->lop_declare_create == NULL)
768 raised = cfs_cap_raised(CFS_CAP_SYS_RESOURCE);
770 cfs_cap_raise(CFS_CAP_SYS_RESOURCE);
771 rc = lop->lop_declare_create(env, loghandle, th);
773 cfs_cap_lower(CFS_CAP_SYS_RESOURCE);
777 static inline int llog_create(const struct lu_env *env,
778 struct llog_handle *handle, struct thandle *th)
780 struct llog_operations *lop;
785 rc = llog_handle2ops(handle, &lop);
788 if (lop->lop_create == NULL)
791 raised = cfs_cap_raised(CFS_CAP_SYS_RESOURCE);
793 cfs_cap_raise(CFS_CAP_SYS_RESOURCE);
794 rc = lop->lop_create(env, handle, th);
796 cfs_cap_lower(CFS_CAP_SYS_RESOURCE);
800 int lustre_process_log(struct super_block *sb, char *logname,
801 struct config_llog_instance *cfg);
802 int lustre_end_log(struct super_block *sb, char *logname,
803 struct config_llog_instance *cfg);
804 int llog_open_create(const struct lu_env *env, struct llog_ctxt *ctxt,
805 struct llog_handle **res, struct llog_logid *logid,
807 int llog_erase(const struct lu_env *env, struct llog_ctxt *ctxt,
808 struct llog_logid *logid, char *name);
809 int llog_write(const struct lu_env *env, struct llog_handle *loghandle,
810 struct llog_rec_hdr *rec, struct llog_cookie *reccookie,
811 int cookiecount, void *buf, int idx);