1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (C) 2001 Cluster File Systems, Inc. <info@clusterfs.com>
6 * This file is part of Lustre, http://www.lustre.org.
8 * Lustre is free software; you can redistribute it and/or
9 * modify it under the terms of version 2 of the GNU General Public
10 * License as published by the Free Software Foundation.
12 * Lustre is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with Lustre; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 * Generic infrastructure for managing a collection of logs.
23 * These logs are used for:
25 * - orphan recovery: OST adds record on create
26 * - mtime/size consistency: the OST adds a record on first write
27 * - open/unlinked objects: OST adds a record on destroy
29 * - mds unlink log: the MDS adds an entry upon delete
31 * - raid1 replication log between OST's
32 * - MDS replication logs
38 #include <linux/obd.h>
39 #include <linux/lustre_idl.h>
41 #define LOG_NAME_LIMIT(logname, name) \
42 snprintf(logname, sizeof(logname), "LOGS/%s", name)
43 #define LLOG_EEMPTY 4711
45 struct plain_handle_data {
46 struct list_head phd_entry;
47 struct llog_handle *phd_cat_handle;
48 struct llog_cookie phd_cookie; /* cookie of this log in its cat */
52 struct cat_handle_data {
53 struct list_head chd_head;
54 struct llog_handle *chd_current_log; /* currently open log */
57 /* In-memory descriptor for a log object or log catalog */
59 struct rw_semaphore lgh_lock;
60 struct llog_logid lgh_id; /* id of this log */
61 struct llog_log_hdr *lgh_hdr;
62 struct file *lgh_file;
64 struct llog_ctxt *lgh_ctxt;
66 struct plain_handle_data phd;
67 struct cat_handle_data chd;
71 /* llog.c - general API */
72 typedef int (*llog_cb_t)(struct llog_handle *, struct llog_rec_hdr *, void *);
73 typedef int (*llog_fill_rec_cb_t)(struct llog_rec_hdr *rec, void *data);
74 extern struct llog_handle *llog_alloc_handle(void);
75 int llog_init_handle(struct llog_handle *handle, int flags,
76 struct obd_uuid *uuid);
77 extern void llog_free_handle(struct llog_handle *handle);
78 int llog_process(struct llog_handle *loghandle, llog_cb_t cb,
79 void *data, void *catdata);
80 int llog_reverse_process(struct llog_handle *loghandle, llog_cb_t cb,
81 void *data, void *catdata);
82 extern int llog_cancel_rec(struct llog_handle *loghandle, int index);
83 extern int llog_close(struct llog_handle *cathandle);
84 extern int llog_get_size(struct llog_handle *loghandle);
86 /* llog_cat.c - catalog api */
87 struct llog_process_data {
92 struct llog_process_cat_data {
95 /* to process catalog across zero record */
98 int llog_cat_put(struct llog_handle *cathandle);
99 int llog_cat_add_rec(struct llog_handle *cathandle, struct llog_rec_hdr *rec,
100 struct llog_cookie *reccookie, void *buf);
101 int llog_cat_cancel_records(struct llog_handle *cathandle, int count,
102 struct llog_cookie *cookies);
103 int llog_cat_process(struct llog_handle *cat_llh, llog_cb_t cb, void *data);
104 int llog_cat_reverse_process(struct llog_handle *cat_llh, llog_cb_t cb, void *data);
105 int llog_cat_set_first_idx(struct llog_handle *cathandle, int index);
108 int llog_setup(struct obd_device *obd, int index, struct obd_device *disk_obd,
109 int count, struct llog_logid *logid,struct llog_operations *op);
110 int llog_cleanup(struct llog_ctxt *);
111 int llog_sync(struct llog_ctxt *ctxt, struct obd_export *exp);
112 int llog_add(struct llog_ctxt *ctxt, struct llog_rec_hdr *rec,
113 struct lov_stripe_md *lsm, struct llog_cookie *logcookies,
115 int llog_cancel(struct llog_ctxt *, struct lov_stripe_md *lsm,
116 int count, struct llog_cookie *cookies, int flags);
118 int llog_obd_origin_setup(struct obd_device *obd, int index,
119 struct obd_device *disk_obd, int count,
120 struct llog_logid *logid);
121 int llog_obd_origin_cleanup(struct llog_ctxt *ctxt);
122 int llog_obd_origin_add(struct llog_ctxt *ctxt,
123 struct llog_rec_hdr *rec, struct lov_stripe_md *lsm,
124 struct llog_cookie *logcookies, int numcookies);
126 int llog_cat_initialize(struct obd_device *obd, int count);
127 int obd_llog_init(struct obd_device *obd, struct obd_device *disk_obd,
128 int count, struct llog_catid *logid);
130 int obd_llog_finish(struct obd_device *obd, int count);
133 int llog_ioctl(struct llog_ctxt *ctxt, int cmd, struct obd_ioctl_data *data);
134 int llog_catalog_list(struct obd_device *obd, int count,
135 struct obd_ioctl_data *data);
138 int llog_initiator_connect(struct llog_ctxt *ctxt);
139 int llog_receptor_accept(struct llog_ctxt *ctxt, struct obd_import *imp);
140 int llog_origin_connect(struct llog_ctxt *ctxt, int count,
141 struct llog_logid *logid, struct llog_gen *gen,
142 struct obd_uuid *uuid);
143 int llog_handle_connect(struct ptlrpc_request *req);
146 int llog_obd_repl_cancel(struct llog_ctxt *ctxt,
147 struct lov_stripe_md *lsm, int count,
148 struct llog_cookie *cookies, int flags);
149 int llog_obd_repl_sync(struct llog_ctxt *ctxt, struct obd_export *exp);
150 int llog_repl_connect(struct llog_ctxt *ctxt, int count,
151 struct llog_logid *logid, struct llog_gen *gen,
152 struct obd_uuid *uuid);
154 struct llog_operations {
155 int (*lop_write_rec)(struct llog_handle *loghandle,
156 struct llog_rec_hdr *rec,
157 struct llog_cookie *logcookies, int numcookies,
159 int (*lop_destroy)(struct llog_handle *handle);
160 int (*lop_next_block)(struct llog_handle *h, int *curr_idx,
161 int next_idx, __u64 *offset, void *buf, int len);
162 int (*lop_prev_block)(struct llog_handle *h,
163 int prev_idx, void *buf, int len);
164 int (*lop_create)(struct llog_ctxt *ctxt, struct llog_handle **,
165 struct llog_logid *logid, char *name);
166 int (*lop_close)(struct llog_handle *handle);
167 int (*lop_read_header)(struct llog_handle *handle);
169 int (*lop_setup)(struct obd_device *obd, int ctxt_idx,
170 struct obd_device *disk_obd, int count,
171 struct llog_logid *logid);
172 int (*lop_sync)(struct llog_ctxt *ctxt, struct obd_export *exp);
173 int (*lop_cleanup)(struct llog_ctxt *ctxt);
174 int (*lop_add)(struct llog_ctxt *ctxt, struct llog_rec_hdr *rec,
175 struct lov_stripe_md *lsm,
176 struct llog_cookie *logcookies, int numcookies);
177 int (*lop_cancel)(struct llog_ctxt *ctxt, struct lov_stripe_md *lsm,
178 int count, struct llog_cookie *cookies, int flags);
179 int (*lop_connect)(struct llog_ctxt *ctxt, int count,
180 struct llog_logid *logid, struct llog_gen *gen,
181 struct obd_uuid *uuid);
182 /* XXX add 2 more: commit callbacks and llog recovery functions */
186 extern struct llog_operations llog_lvfs_ops;
187 int llog_get_cat_list(struct obd_device *obd, struct obd_device *disk_obd,
188 char *name, int count, struct llog_catid *idarray);
191 int loc_idx; /* my index the obd array of ctxt's */
192 struct llog_gen loc_gen;
193 struct obd_device *loc_obd; /* points back to the containing obd*/
194 struct obd_export *loc_exp; /* parent "disk" export (e.g. MDS) */
195 struct obd_import *loc_imp; /* to use in RPC's: can be backward
197 struct llog_operations *loc_logops;
198 struct llog_handle *loc_handle;
199 struct llog_canceld_ctxt *loc_llcd;
200 struct semaphore loc_sem; /* protects loc_llcd and loc_imp */
204 static inline void llog_gen_init(struct llog_ctxt *ctxt)
206 struct obd_device *obd = ctxt->loc_exp->exp_obd;
208 if (!strcmp(obd->obd_type->typ_name, LUSTRE_MDS_NAME))
209 ctxt->loc_gen.mnt_cnt = obd->u.mds.mds_mount_count;
210 else if (!strstr(obd->obd_type->typ_name, LUSTRE_FILTER_NAME))
211 ctxt->loc_gen.mnt_cnt = obd->u.filter.fo_mount_count;
213 ctxt->loc_gen.mnt_cnt = 0;
216 static inline int llog_gen_lt(struct llog_gen a, struct llog_gen b)
218 if (a.mnt_cnt < b.mnt_cnt)
220 if (a.mnt_cnt > b.mnt_cnt)
222 return(a.conn_cnt < b.conn_cnt ? 1 : 0);
225 #define LLOG_GEN_INC(gen) ((gen).conn_cnt ++)
226 #define LLOG_PROC_BREAK 0x0001
227 #define LLOG_DEL_RECORD 0x0002
229 static inline int llog_obd2ops(struct llog_ctxt *ctxt,
230 struct llog_operations **lop)
235 *lop = ctxt->loc_logops;
242 static inline int llog_handle2ops(struct llog_handle *loghandle,
243 struct llog_operations **lop)
245 if (loghandle == NULL)
248 return llog_obd2ops(loghandle->lgh_ctxt, lop);
251 static inline int llog_data_len(int len)
253 return size_round(len);
256 static inline struct llog_ctxt *llog_get_context(struct obd_device *obd,
259 if (index < 0 || index >= LLOG_MAX_CTXTS)
262 return obd->obd_llog_ctxt[index];
265 static inline int llog_write_rec(struct llog_handle *handle,
266 struct llog_rec_hdr *rec,
267 struct llog_cookie *logcookies,
268 int numcookies, void *buf, int idx)
270 struct llog_operations *lop;
274 rc = llog_handle2ops(handle, &lop);
277 if (lop->lop_write_rec == NULL)
281 buflen = rec->lrh_len + sizeof(struct llog_rec_hdr)
282 + sizeof(struct llog_rec_tail);
284 buflen = rec->lrh_len;
285 LASSERT(size_round(buflen) == buflen);
287 rc = lop->lop_write_rec(handle, rec, logcookies, numcookies, buf, idx);
291 static inline int llog_read_header(struct llog_handle *handle)
293 struct llog_operations *lop;
297 rc = llog_handle2ops(handle, &lop);
300 if (lop->lop_read_header == NULL)
303 rc = lop->lop_read_header(handle);
307 static inline int llog_destroy(struct llog_handle *handle)
309 struct llog_operations *lop;
313 rc = llog_handle2ops(handle, &lop);
316 if (lop->lop_destroy == NULL)
319 rc = lop->lop_destroy(handle);
324 static inline int llog_cancel(struct obd_export *exp,
325 struct lov_stripe_md *lsm, int count,
326 struct llog_cookie *cookies, int flags)
328 struct llog_operations *lop;
332 rc = llog_handle2ops(loghandle, &lop);
335 if (lop->lop_cancel == NULL)
338 rc = lop->lop_cancel(exp, lsm, count, cookies, flags);
343 static inline int llog_next_block(struct llog_handle *loghandle, int *cur_idx,
344 int next_idx, __u64 *cur_offset, void *buf,
347 struct llog_operations *lop;
351 rc = llog_handle2ops(loghandle, &lop);
354 if (lop->lop_next_block == NULL)
357 rc = lop->lop_next_block(loghandle, cur_idx, next_idx, cur_offset, buf,
362 static inline int llog_prev_block(struct llog_handle *loghandle,
363 int prev_idx, void *buf, int len)
365 struct llog_operations *lop;
369 rc = llog_handle2ops(loghandle, &lop);
372 if (lop->lop_prev_block == NULL)
375 rc = lop->lop_prev_block(loghandle, prev_idx, buf, len);
379 static inline int llog_create(struct llog_ctxt *ctxt, struct llog_handle **res,
380 struct llog_logid *logid, char *name)
382 struct llog_operations *lop;
386 rc = llog_obd2ops(ctxt, &lop);
389 if (lop->lop_create == NULL)
392 rc = lop->lop_create(ctxt, res, logid, name);
396 static inline int llog_connect(struct llog_ctxt *ctxt, int count,
397 struct llog_logid *logid, struct llog_gen *gen,
398 struct obd_uuid *uuid)
400 struct llog_operations *lop;
404 rc = llog_obd2ops(ctxt, &lop);
407 if (lop->lop_connect == NULL)
410 rc = lop->lop_connect(ctxt, count, logid, gen, uuid);