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_reverse_process(const struct lu_env *env,
126 struct llog_handle *loghandle, llog_cb_t cb,
127 void *data, void *catdata);
128 int llog_cancel_rec(const struct lu_env *env, struct llog_handle *loghandle,
130 int llog_open(const struct lu_env *env, struct llog_ctxt *ctxt,
131 struct llog_handle **lgh, struct llog_logid *logid,
132 char *name, enum llog_open_param open_param);
133 int llog_close(const struct lu_env *env, struct llog_handle *cathandle);
134 int llog_get_size(struct llog_handle *loghandle);
136 /* llog_process flags */
137 #define LLOG_FLAG_NODEAMON 0x0001
139 /* llog_cat.c - catalog api */
140 struct llog_process_data {
142 * Any useful data needed while processing catalog. This is
143 * passed later to process callback.
147 * Catalog process callback function, called for each record
152 * Start processing the catalog from startcat/startidx
158 struct llog_process_cat_data {
160 * Temporary stored first_idx while scanning log.
164 * Temporary stored last_idx while scanning log.
169 struct llog_process_cat_args {
171 * Llog context used in recovery thread on OST (recov_thread.c)
173 struct llog_ctxt *lpca_ctxt;
175 * Llog callback used in recovery thread on OST (recov_thread.c)
179 * Data pointer for llog callback.
184 int cat_cancel_cb(const struct lu_env *env, struct llog_handle *cathandle,
185 struct llog_rec_hdr *rec, void *data);
186 int llog_cat_close(const struct lu_env *env, struct llog_handle *cathandle);
187 int llog_cat_add_rec(const struct lu_env *env, struct llog_handle *cathandle,
188 struct llog_rec_hdr *rec, struct llog_cookie *reccookie,
190 int llog_cat_cancel_records(const struct lu_env *env,
191 struct llog_handle *cathandle, int count,
192 struct llog_cookie *cookies);
193 int __llog_cat_process(const struct lu_env *env, struct llog_handle *cat_llh,
194 llog_cb_t cb, void *data, int startcat, int startidx,
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);
198 int llog_cat_process_thread(void *data);
199 int llog_cat_reverse_process(const struct lu_env *env,
200 struct llog_handle *cat_llh, llog_cb_t cb,
202 int llog_cat_set_first_idx(struct llog_handle *cathandle, int index);
205 int llog_setup_named(struct obd_device *obd, struct obd_llog_group *olg,
206 int index, struct obd_device *disk_obd, int count,
207 struct llog_logid *logid, const char *logname,
208 struct llog_operations *op);
209 int llog_setup(struct obd_device *obd, struct obd_llog_group *olg, int index,
210 struct obd_device *disk_obd, int count, struct llog_logid *logid,
211 struct llog_operations *op);
212 int __llog_ctxt_put(struct llog_ctxt *ctxt);
213 int llog_cleanup(struct llog_ctxt *);
214 int llog_sync(struct llog_ctxt *ctxt, struct obd_export *exp, int flags);
215 int llog_add(const struct lu_env *env, struct llog_ctxt *ctxt,
216 struct llog_rec_hdr *rec, struct lov_stripe_md *lsm,
217 struct llog_cookie *logcookies, int numcookies);
218 int llog_cancel(const struct lu_env *env, struct llog_ctxt *ctxt,
219 struct lov_stripe_md *lsm, int count,
220 struct llog_cookie *cookies, int flags);
221 int llog_obd_origin_setup(const struct lu_env *env, struct obd_device *obd,
222 struct obd_llog_group *olg, int index,
223 struct obd_device *disk_obd, int count,
224 struct llog_logid *logid, const char *name);
225 int llog_obd_origin_cleanup(const struct lu_env *env, struct llog_ctxt *ctxt);
226 int llog_obd_origin_add(const struct lu_env *env, struct llog_ctxt *ctxt,
227 struct llog_rec_hdr *rec, struct lov_stripe_md *lsm,
228 struct llog_cookie *logcookies, int numcookies);
230 int obd_llog_init(struct obd_device *obd, struct obd_llog_group *olg,
231 struct obd_device *disk_obd, int *idx);
233 int obd_llog_finish(struct obd_device *obd, int count);
236 int llog_ioctl(struct llog_ctxt *ctxt, int cmd, struct obd_ioctl_data *data);
237 int llog_catalog_list(struct obd_device *obd, int count,
238 struct obd_ioctl_data *data);
241 int llog_initiator_connect(struct llog_ctxt *ctxt);
242 int llog_receptor_accept(struct llog_ctxt *ctxt, struct obd_import *imp);
243 int llog_origin_connect(struct llog_ctxt *ctxt,
244 struct llog_logid *logid, struct llog_gen *gen,
245 struct obd_uuid *uuid);
246 int llog_handle_connect(struct ptlrpc_request *req);
249 int llog_obd_repl_cancel(const struct lu_env *env, struct llog_ctxt *ctxt,
250 struct lov_stripe_md *lsm, int count,
251 struct llog_cookie *cookies, int flags);
252 int llog_obd_repl_sync(struct llog_ctxt *ctxt, struct obd_export *exp,
254 int llog_obd_repl_connect(struct llog_ctxt *ctxt,
255 struct llog_logid *logid, struct llog_gen *gen,
256 struct obd_uuid *uuid);
258 struct llog_operations {
259 int (*lop_destroy)(const struct lu_env *env,
260 struct llog_handle *handle);
261 int (*lop_next_block)(const struct lu_env *env, struct llog_handle *h,
262 int *curr_idx, int next_idx, __u64 *offset,
264 int (*lop_prev_block)(const struct lu_env *env, struct llog_handle *h,
265 int prev_idx, void *buf, int len);
266 int (*lop_read_header)(const struct lu_env *env,
267 struct llog_handle *handle);
268 int (*lop_setup)(const struct lu_env *env, struct obd_device *obd,
269 struct obd_llog_group *olg, int ctxt_idx,
270 struct obd_device *disk_obd, int count,
271 struct llog_logid *logid, const char *name);
272 int (*lop_sync)(struct llog_ctxt *ctxt, struct obd_export *exp,
274 int (*lop_cleanup)(const struct lu_env *env, struct llog_ctxt *ctxt);
275 int (*lop_cancel)(const struct lu_env *env, struct llog_ctxt *ctxt,
276 struct lov_stripe_md *lsm, int count,
277 struct llog_cookie *cookies, int flags);
278 int (*lop_connect)(struct llog_ctxt *ctxt, struct llog_logid *logid,
279 struct llog_gen *gen, struct obd_uuid *uuid);
281 * Any llog file must be opened first using llog_open(). Llog can be
282 * opened by name, logid or without both, in last case the new logid
285 int (*lop_open)(const struct lu_env *env, struct llog_handle *lgh,
286 struct llog_logid *logid, char *name,
287 enum llog_open_param);
289 * Opened llog may not exist and this must be checked where needed using
290 * the llog_exist() call.
292 int (*lop_exist)(struct llog_handle *lgh);
294 * Close llog file and calls llog_free_handle() implicitly.
295 * Any opened llog must be closed by llog_close() call.
297 int (*lop_close)(const struct lu_env *env, struct llog_handle *handle);
299 * Create new llog file. The llog must be opened.
300 * Must be used only for local llog operations.
302 int (*lop_declare_create)(const struct lu_env *env,
303 struct llog_handle *handle,
305 int (*lop_create)(const struct lu_env *env, struct llog_handle *handle,
308 * write new record in llog. It appends records usually but can edit
309 * existing records too.
311 int (*lop_write_rec)(const struct lu_env *env,
312 struct llog_handle *loghandle,
313 struct llog_rec_hdr *rec,
314 struct llog_cookie *logcookies, int numcookies,
317 * Add new record in llog catalog. Does the same as llog_write_rec()
318 * but using llog catalog.
320 int (*lop_add)(const struct lu_env *env, struct llog_ctxt *ctxt,
321 struct llog_rec_hdr *rec, struct lov_stripe_md *lsm,
322 struct llog_cookie *logcookies, int numcookies);
325 /* In-memory descriptor for a log object or log catalog */
327 cfs_rw_semaphore_t lgh_lock;
328 cfs_spinlock_t lgh_hdr_lock; /* protect lgh_hdr data */
329 struct llog_logid lgh_id; /* id of this log */
330 struct llog_log_hdr *lgh_hdr;
331 struct file *lgh_file;
332 struct dt_object *lgh_obj;
334 int lgh_cur_idx; /* used during llog_process */
335 __u64 lgh_cur_offset; /* used during llog_process */
336 struct llog_ctxt *lgh_ctxt;
338 struct plain_handle_data phd;
339 struct cat_handle_data chd;
343 struct llog_operations *lgh_logops;
347 extern struct llog_operations llog_lvfs_ops;
348 int llog_get_cat_list(struct obd_device *disk_obd,
349 char *name, int idx, int count,
350 struct llog_catid *idarray);
352 int llog_put_cat_list(struct obd_device *disk_obd,
353 char *name, int idx, int count, struct llog_catid *idarray);
355 #define LLOG_CTXT_FLAG_UNINITIALIZED 0x00000001
356 #define LLOG_CTXT_FLAG_STOP 0x00000002
359 int loc_idx; /* my index the obd array of ctxt's */
360 struct llog_gen loc_gen;
361 struct obd_device *loc_obd; /* points back to the containing obd*/
362 struct obd_llog_group *loc_olg; /* group containing that ctxt */
363 struct obd_export *loc_exp; /* parent "disk" export (e.g. MDS) */
364 struct obd_import *loc_imp; /* to use in RPC's: can be backward
366 struct llog_operations *loc_logops;
367 struct llog_handle *loc_handle;
368 struct llog_commit_master *loc_lcm;
369 struct llog_canceld_ctxt *loc_llcd;
370 cfs_mutex_t loc_mutex; /* protects loc_llcd and loc_imp */
371 cfs_atomic_t loc_refcount;
373 long loc_flags; /* flags, see above defines */
374 struct dt_object *loc_dir;
377 #define LCM_NAME_SIZE 64
379 struct llog_commit_master {
381 * Thread control flags (start, stop, etc.)
385 * Number of llcds onthis lcm.
387 cfs_atomic_t lcm_count;
389 * The refcount for lcm
391 cfs_atomic_t lcm_refcount;
393 * Thread control structure. Used for control commit thread.
395 struct ptlrpcd_ctl lcm_pc;
397 * Lock protecting list of llcds.
399 cfs_spinlock_t lcm_lock;
401 * Llcds in flight for debugging purposes.
403 cfs_list_t lcm_llcds;
405 * Commit thread name buffer. Only used for thread start.
407 char lcm_name[LCM_NAME_SIZE];
410 static inline struct llog_commit_master
411 *lcm_get(struct llog_commit_master *lcm)
413 cfs_atomic_inc(&lcm->lcm_refcount);
418 lcm_put(struct llog_commit_master *lcm)
420 LASSERT_ATOMIC_POS(&lcm->lcm_refcount);
421 if (cfs_atomic_dec_and_test(&lcm->lcm_refcount))
425 struct llog_canceld_ctxt {
427 * Llog context this llcd is attached to. Used for accessing
428 * ->loc_import and others in process of canceling cookies
429 * gathered in this llcd.
431 struct llog_ctxt *llcd_ctxt;
433 * Cancel thread control stucture pointer. Used for accessing
434 * it to see if should stop processing and other needs.
436 struct llog_commit_master *llcd_lcm;
438 * Maximal llcd size. Used in calculations on how much of room
439 * left in llcd to cookie comming cookies.
443 * Link to lcm llcds list.
445 cfs_list_t llcd_list;
447 * Current llcd size while gathering cookies. This should not be
448 * more than ->llcd_size. Used for determining if we need to
449 * send this llcd (if full) and allocate new one. This is also
450 * used for copying new cookie at the end of buffer.
452 int llcd_cookiebytes;
454 * Pointer to the start of cookies buffer.
456 struct llog_cookie llcd_cookies[0];
459 /* ptlrpc/recov_thread.c */
460 extern struct llog_commit_master *llog_recov_thread_init(char *name);
461 extern void llog_recov_thread_fini(struct llog_commit_master *lcm,
463 extern int llog_recov_thread_start(struct llog_commit_master *lcm);
464 extern void llog_recov_thread_stop(struct llog_commit_master *lcm,
467 static inline void llog_gen_init(struct llog_ctxt *ctxt)
469 struct obd_device *obd = ctxt->loc_exp->exp_obd;
471 LASSERTF(obd->u.obt.obt_magic == OBT_MAGIC,
472 "%s: wrong obt magic %#x\n",
473 obd->obd_name, obd->u.obt.obt_magic);
474 ctxt->loc_gen.mnt_cnt = obd->u.obt.obt_mount_count;
475 ctxt->loc_gen.conn_cnt++;
478 static inline int llog_gen_lt(struct llog_gen a, struct llog_gen b)
480 if (a.mnt_cnt < b.mnt_cnt)
482 if (a.mnt_cnt > b.mnt_cnt)
484 return(a.conn_cnt < b.conn_cnt ? 1 : 0);
487 #define LLOG_PROC_BREAK 0x0001
488 #define LLOG_DEL_RECORD 0x0002
490 static inline int llog_obd2ops(struct llog_ctxt *ctxt,
491 struct llog_operations **lop)
496 *lop = ctxt->loc_logops;
503 static inline int llog_handle2ops(struct llog_handle *loghandle,
504 struct llog_operations **lop)
506 if (loghandle == NULL || loghandle->lgh_logops == NULL)
509 *lop = loghandle->lgh_logops;
513 static inline int llog_data_len(int len)
515 return cfs_size_round(len);
518 static inline struct llog_ctxt *llog_ctxt_get(struct llog_ctxt *ctxt)
520 cfs_atomic_inc(&ctxt->loc_refcount);
521 CDEBUG(D_INFO, "GETting ctxt %p : new refcount %d\n", ctxt,
522 cfs_atomic_read(&ctxt->loc_refcount));
526 static inline void llog_ctxt_put(struct llog_ctxt *ctxt)
530 LASSERT_ATOMIC_GT_LT(&ctxt->loc_refcount, 0, LI_POISON);
531 CDEBUG(D_INFO, "PUTting ctxt %p : new refcount %d\n", ctxt,
532 cfs_atomic_read(&ctxt->loc_refcount) - 1);
533 __llog_ctxt_put(ctxt);
536 static inline void llog_group_init(struct obd_llog_group *olg, int group)
538 cfs_waitq_init(&olg->olg_waitq);
539 cfs_spin_lock_init(&olg->olg_lock);
540 cfs_mutex_init(&olg->olg_cat_processing);
541 olg->olg_seq = group;
544 static inline void llog_group_set_export(struct obd_llog_group *olg,
545 struct obd_export *exp)
547 LASSERT(exp != NULL);
549 cfs_spin_lock(&olg->olg_lock);
550 if (olg->olg_exp != NULL && olg->olg_exp != exp)
551 CWARN("%s: export for group %d is changed: 0x%p -> 0x%p\n",
552 exp->exp_obd->obd_name, olg->olg_seq,
555 cfs_spin_unlock(&olg->olg_lock);
558 static inline int llog_group_set_ctxt(struct obd_llog_group *olg,
559 struct llog_ctxt *ctxt, int index)
561 LASSERT(index >= 0 && index < LLOG_MAX_CTXTS);
563 cfs_spin_lock(&olg->olg_lock);
564 if (olg->olg_ctxts[index] != NULL) {
565 cfs_spin_unlock(&olg->olg_lock);
568 olg->olg_ctxts[index] = ctxt;
569 cfs_spin_unlock(&olg->olg_lock);
573 static inline struct llog_ctxt *llog_group_get_ctxt(struct obd_llog_group *olg,
576 struct llog_ctxt *ctxt;
578 LASSERT(index >= 0 && index < LLOG_MAX_CTXTS);
580 cfs_spin_lock(&olg->olg_lock);
581 if (olg->olg_ctxts[index] == NULL) {
584 ctxt = llog_ctxt_get(olg->olg_ctxts[index]);
586 cfs_spin_unlock(&olg->olg_lock);
590 static inline struct llog_ctxt *llog_get_context(struct obd_device *obd,
593 return llog_group_get_ctxt(&obd->obd_olg, index);
596 static inline int llog_group_ctxt_null(struct obd_llog_group *olg, int index)
598 return (olg->olg_ctxts[index] == NULL);
601 static inline int llog_ctxt_null(struct obd_device *obd, int index)
603 return (llog_group_ctxt_null(&obd->obd_olg, index));
606 static inline int llog_write_rec(const struct lu_env *env,
607 struct llog_handle *handle,
608 struct llog_rec_hdr *rec,
609 struct llog_cookie *logcookies,
610 int numcookies, void *buf, int idx)
612 struct llog_operations *lop;
613 int raised, rc, buflen;
617 rc = llog_handle2ops(handle, &lop);
621 if (lop->lop_write_rec == NULL)
624 /* FIXME: Why doesn't caller just set the right lrh_len itself? */
626 buflen = rec->lrh_len + sizeof(struct llog_rec_hdr) +
627 sizeof(struct llog_rec_tail);
629 buflen = rec->lrh_len;
630 LASSERT(cfs_size_round(buflen) == buflen);
632 raised = cfs_cap_raised(CFS_CAP_SYS_RESOURCE);
634 cfs_cap_raise(CFS_CAP_SYS_RESOURCE);
635 rc = lop->lop_write_rec(env, handle, rec, logcookies, numcookies,
638 cfs_cap_lower(CFS_CAP_SYS_RESOURCE);
642 static inline int llog_destroy(const struct lu_env *env,
643 struct llog_handle *handle)
645 struct llog_operations *lop;
650 rc = llog_handle2ops(handle, &lop);
653 if (lop->lop_destroy == NULL)
656 rc = lop->lop_destroy(env, handle);
660 static inline int llog_next_block(const struct lu_env *env,
661 struct llog_handle *loghandle, int *cur_idx,
662 int next_idx, __u64 *cur_offset, void *buf,
665 struct llog_operations *lop;
670 rc = llog_handle2ops(loghandle, &lop);
673 if (lop->lop_next_block == NULL)
676 rc = lop->lop_next_block(env, loghandle, cur_idx, next_idx,
677 cur_offset, buf, len);
681 static inline int llog_prev_block(const struct lu_env *env,
682 struct llog_handle *loghandle,
683 int prev_idx, void *buf, int len)
685 struct llog_operations *lop;
690 rc = llog_handle2ops(loghandle, &lop);
693 if (lop->lop_prev_block == NULL)
696 rc = lop->lop_prev_block(env, loghandle, prev_idx, buf, len);
700 static inline int llog_connect(struct llog_ctxt *ctxt,
701 struct llog_logid *logid, struct llog_gen *gen,
702 struct obd_uuid *uuid)
704 struct llog_operations *lop;
709 rc = llog_obd2ops(ctxt, &lop);
712 if (lop->lop_connect == NULL)
715 rc = lop->lop_connect(ctxt, logid, gen, uuid);
723 * llog_open - open llog, may not exist
724 * llog_exist - check if llog exists
725 * llog_close - close opened llog, pair for open, frees llog_handle
726 * llog_declare_create - declare llog creation
727 * llog_create - create new llog on disk, need transaction handle
729 static inline int llog_exist(struct llog_handle *loghandle)
731 struct llog_operations *lop;
736 rc = llog_handle2ops(loghandle, &lop);
739 if (lop->lop_exist == NULL)
741 raised = cfs_cap_raised(CFS_CAP_SYS_RESOURCE);
743 cfs_cap_raise(CFS_CAP_SYS_RESOURCE);
744 rc = lop->lop_exist(loghandle);
746 cfs_cap_lower(CFS_CAP_SYS_RESOURCE);
750 static inline int llog_declare_create(const struct lu_env *env,
751 struct llog_handle *loghandle,
754 struct llog_operations *lop;
759 rc = llog_handle2ops(loghandle, &lop);
762 if (lop->lop_declare_create == NULL)
765 raised = cfs_cap_raised(CFS_CAP_SYS_RESOURCE);
767 cfs_cap_raise(CFS_CAP_SYS_RESOURCE);
768 rc = lop->lop_declare_create(env, loghandle, th);
770 cfs_cap_lower(CFS_CAP_SYS_RESOURCE);
774 static inline int llog_create(const struct lu_env *env,
775 struct llog_handle *handle, struct thandle *th)
777 struct llog_operations *lop;
782 rc = llog_handle2ops(handle, &lop);
785 if (lop->lop_create == NULL)
788 raised = cfs_cap_raised(CFS_CAP_SYS_RESOURCE);
790 cfs_cap_raise(CFS_CAP_SYS_RESOURCE);
791 rc = lop->lop_create(env, handle, th);
793 cfs_cap_lower(CFS_CAP_SYS_RESOURCE);
797 int lustre_process_log(struct super_block *sb, char *logname,
798 struct config_llog_instance *cfg);
799 int lustre_end_log(struct super_block *sb, char *logname,
800 struct config_llog_instance *cfg);
801 int llog_open_create(const struct lu_env *env, struct llog_ctxt *ctxt,
802 struct llog_handle **res, struct llog_logid *logid,
804 int llog_erase(const struct lu_env *env, struct llog_ctxt *ctxt,
805 struct llog_logid *logid, char *name);
806 int llog_write(const struct lu_env *env, struct llog_handle *loghandle,
807 struct llog_rec_hdr *rec, struct llog_cookie *reccookie,
808 int cookiecount, void *buf, int idx);