1 /* -*- MODE: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * lustre/fld/fld_handler.c
5 * FLD (Fids Location Database)
7 * Copyright (C) 2006 Cluster File Systems, Inc.
8 * Author: Yury Umanets <umka@clusterfs.com>
9 * WangDi <wangdi@clusterfs.com>
11 * This file is part of the Lustre file system, http://www.lustre.org
12 * Lustre is a trademark of Cluster File Systems, Inc.
14 * You may have signed or agreed to another license before downloading
15 * this software. If so, you are bound by the terms and conditions
16 * of that agreement, and the following does not apply to you. See the
17 * LICENSE file included with this distribution for more information.
19 * If you did not agree to a different license, then this copy of Lustre
20 * is open source software; you can redistribute it and/or modify it
21 * under the terms of version 2 of the GNU General Public License as
22 * published by the Free Software Foundation.
24 * In either case, Lustre is distributed in the hope that it will be
25 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
26 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 * license text for more details.
30 # define EXPORT_SYMTAB
32 #define DEBUG_SUBSYSTEM S_FLD
35 # include <libcfs/libcfs.h>
36 # include <linux/module.h>
37 # include <linux/jbd.h>
38 # include <asm/div64.h>
39 #else /* __KERNEL__ */
40 # include <liblustre.h>
41 # include <libcfs/list.h>
45 #include <obd_class.h>
46 #include <lustre_ver.h>
47 #include <obd_support.h>
48 #include <lprocfs_status.h>
50 #include <md_object.h>
51 #include <lustre_req_layout.h>
52 #include "fld_internal.h"
56 LU_KEY_INIT_FINI(fld, struct fld_thread_info);
58 struct lu_context_key fld_thread_key = {
59 .lct_tags = LCT_MD_THREAD|LCT_DT_THREAD,
60 .lct_init = fld_key_init,
61 .lct_fini = fld_key_fini
64 cfs_proc_dir_entry_t *fld_type_proc_dir = NULL;
66 static int __init fld_mod_init(void)
68 fld_type_proc_dir = lprocfs_register(LUSTRE_FLD_NAME,
71 if (IS_ERR(fld_type_proc_dir))
72 return PTR_ERR(fld_type_proc_dir);
74 LU_CONTEXT_KEY_INIT(&fld_thread_key);
75 lu_context_key_register(&fld_thread_key);
79 static void __exit fld_mod_exit(void)
81 lu_context_key_degister(&fld_thread_key);
82 if (fld_type_proc_dir != NULL && !IS_ERR(fld_type_proc_dir)) {
83 lprocfs_remove(&fld_type_proc_dir);
84 fld_type_proc_dir = NULL;
88 /* Insert index entry and update cache. */
89 int fld_server_create(struct lu_server_fld *fld,
90 const struct lu_env *env,
91 seqno_t seq, mdsno_t mds)
96 rc = fld_index_create(fld, env, seq, mds);
100 * Do not return result of calling fld_cache_insert()
101 * here. First of all because it may return -EEXISTS. Another
102 * reason is that, we do not want to stop proceeding even after
105 fld_cache_insert(fld->lsf_cache, seq, mds);
110 EXPORT_SYMBOL(fld_server_create);
112 /* Delete index entry. */
113 int fld_server_delete(struct lu_server_fld *fld,
114 const struct lu_env *env,
120 fld_cache_delete(fld->lsf_cache, seq);
121 rc = fld_index_delete(fld, env, seq);
125 EXPORT_SYMBOL(fld_server_delete);
127 /* Lookup mds by seq. */
128 int fld_server_lookup(struct lu_server_fld *fld,
129 const struct lu_env *env,
130 seqno_t seq, mdsno_t *mds)
135 /* Lookup it in the cache. */
136 rc = fld_cache_lookup(fld->lsf_cache, seq, mds);
140 rc = fld_index_lookup(fld, env, seq, mds);
143 * Do not return error here as well. See previous comment in
144 * same situation in function fld_server_create().
146 fld_cache_insert(fld->lsf_cache, seq, *mds);
150 EXPORT_SYMBOL(fld_server_lookup);
152 static int fld_server_handle(struct lu_server_fld *fld,
153 const struct lu_env *env,
154 __u32 opc, struct md_fld *mf,
155 struct fld_thread_info *info)
162 rc = fld_server_create(fld, env,
163 mf->mf_seq, mf->mf_mds);
165 /* Do not return -EEXIST error for resent case */
166 if ((info->fti_flags & MSG_RESENT) && rc == -EEXIST)
170 rc = fld_server_delete(fld, env, mf->mf_seq);
172 /* Do not return -ENOENT error for resent case */
173 if ((info->fti_flags & MSG_RESENT) && rc == -ENOENT)
177 rc = fld_server_lookup(fld, env,
178 mf->mf_seq, &mf->mf_mds);
185 CDEBUG(D_INFO, "%s: FLD req handle: error %d (opc: %d, seq: "
186 LPX64", mds: "LPU64")\n", fld->lsf_name, rc, opc,
187 mf->mf_seq, mf->mf_mds);
193 static int fld_req_handle(struct ptlrpc_request *req,
194 struct fld_thread_info *info)
196 struct lu_site *site;
203 site = req->rq_export->exp_obd->obd_lu_dev->ld_site;
205 rc = req_capsule_pack(&info->fti_pill);
207 RETURN(err_serious(rc));
209 opc = req_capsule_client_get(&info->fti_pill, &RMF_FLD_OPC);
211 in = req_capsule_client_get(&info->fti_pill, &RMF_FLD_MDFLD);
213 RETURN(err_serious(-EPROTO));
214 out = req_capsule_server_get(&info->fti_pill, &RMF_FLD_MDFLD);
216 RETURN(err_serious(-EPROTO));
219 rc = fld_server_handle(site->ls_server_fld,
220 req->rq_svc_thread->t_env,
223 rc = err_serious(-EPROTO);
228 static void fld_thread_info_init(struct ptlrpc_request *req,
229 struct fld_thread_info *info)
233 info->fti_flags = lustre_msg_get_flags(req->rq_reqmsg);
235 /* Mark rep buffer as req-layout stuff expects. */
236 for (i = 0; i < ARRAY_SIZE(info->fti_rep_buf_size); i++)
237 info->fti_rep_buf_size[i] = -1;
239 /* Init request capsule. */
240 req_capsule_init(&info->fti_pill, req, RCL_SERVER,
241 info->fti_rep_buf_size);
243 req_capsule_set(&info->fti_pill, &RQF_FLD_QUERY);
246 static void fld_thread_info_fini(struct fld_thread_info *info)
248 req_capsule_fini(&info->fti_pill);
251 static int fld_handle(struct ptlrpc_request *req)
253 struct fld_thread_info *info;
254 const struct lu_env *env;
257 env = req->rq_svc_thread->t_env;
258 LASSERT(env != NULL);
260 info = lu_context_key_get(&env->le_ctx, &fld_thread_key);
261 LASSERT(info != NULL);
263 fld_thread_info_init(req, info);
264 rc = fld_req_handle(req, info);
265 fld_thread_info_fini(info);
271 * Entry point for handling FLD RPCs called from MDT.
273 int fld_query(struct com_thread_info *info)
275 return fld_handle(info->cti_pill.rc_req);
277 EXPORT_SYMBOL(fld_query);
280 * Returns true, if fid is local to this server node.
282 * WARNING: this function is *not* guaranteed to return false if fid is
283 * remote: it makes an educated conservative guess only.
285 * fid_is_local() is supposed to be used in assertion checks only.
287 int fid_is_local(struct lu_site *site, const struct lu_fid *fid)
291 result = 1; /* conservatively assume fid is local */
292 if (site->ls_client_fld != NULL) {
296 rc = fld_cache_lookup(site->ls_client_fld->lcf_cache,
299 result = (mds == site->ls_node_id);
303 EXPORT_SYMBOL(fid_is_local);
305 static void fld_server_proc_fini(struct lu_server_fld *fld);
308 static int fld_server_proc_init(struct lu_server_fld *fld)
313 fld->lsf_proc_dir = lprocfs_register(fld->lsf_name,
315 fld_server_proc_list, fld);
316 if (IS_ERR(fld->lsf_proc_dir)) {
317 rc = PTR_ERR(fld->lsf_proc_dir);
324 static void fld_server_proc_fini(struct lu_server_fld *fld)
327 if (fld->lsf_proc_dir != NULL) {
328 if (!IS_ERR(fld->lsf_proc_dir))
329 lprocfs_remove(&fld->lsf_proc_dir);
330 fld->lsf_proc_dir = NULL;
335 static int fld_server_proc_init(struct lu_server_fld *fld)
340 static void fld_server_proc_fini(struct lu_server_fld *fld)
346 int fld_server_init(struct lu_server_fld *fld, struct dt_device *dt,
347 const char *prefix, const struct lu_env *env)
349 int cache_size, cache_threshold;
353 snprintf(fld->lsf_name, sizeof(fld->lsf_name),
356 cache_size = FLD_SERVER_CACHE_SIZE /
357 sizeof(struct fld_cache_entry);
359 cache_threshold = cache_size *
360 FLD_SERVER_CACHE_THRESHOLD / 100;
362 fld->lsf_cache = fld_cache_init(fld->lsf_name,
363 FLD_SERVER_HTABLE_SIZE,
364 cache_size, cache_threshold);
365 if (IS_ERR(fld->lsf_cache)) {
366 rc = PTR_ERR(fld->lsf_cache);
367 fld->lsf_cache = NULL;
371 rc = fld_index_init(fld, env, dt);
375 rc = fld_server_proc_init(fld);
382 fld_server_fini(fld, env);
385 EXPORT_SYMBOL(fld_server_init);
387 void fld_server_fini(struct lu_server_fld *fld,
388 const struct lu_env *env)
392 fld_server_proc_fini(fld);
393 fld_index_fini(fld, env);
395 if (fld->lsf_cache != NULL) {
396 if (!IS_ERR(fld->lsf_cache))
397 fld_cache_fini(fld->lsf_cache);
398 fld->lsf_cache = NULL;
403 EXPORT_SYMBOL(fld_server_fini);
405 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
406 MODULE_DESCRIPTION("Lustre FLD");
407 MODULE_LICENSE("GPL");
409 cfs_module(mdd, "0.1.0", fld_mod_init, fld_mod_exit);