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: WangDi <wangdi@clusterfs.com>
9 * Yury Umanets <umka@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"
55 static void *fld_key_init(const struct lu_context *ctx,
56 struct lu_context_key *key)
58 struct fld_thread_info *info;
63 info = ERR_PTR(-ENOMEM);
67 static void fld_key_fini(const struct lu_context *ctx,
68 struct lu_context_key *key, void *data)
70 struct fld_thread_info *info = data;
76 struct lu_context_key fld_thread_key = {
77 .lct_tags = LCT_MD_THREAD|LCT_DT_THREAD,
78 .lct_init = fld_key_init,
79 .lct_fini = fld_key_fini
82 static int __init fld_mod_init(void)
84 printk(KERN_INFO "Lustre: Fid Location Database; info@clusterfs.com\n");
85 lu_context_key_register(&fld_thread_key);
89 static void __exit fld_mod_exit(void)
91 lu_context_key_degister(&fld_thread_key);
95 /* insert index entry and update cache */
96 int fld_server_create(struct lu_server_fld *fld,
97 const struct lu_context *ctx,
98 seqno_t seq, mdsno_t mds)
100 return fld_index_create(fld, ctx, seq, mds);
102 EXPORT_SYMBOL(fld_server_create);
104 /* delete index entry */
105 int fld_server_delete(struct lu_server_fld *fld,
106 const struct lu_context *ctx,
109 return fld_index_delete(fld, ctx, seq);
111 EXPORT_SYMBOL(fld_server_delete);
113 /* issue on-disk index lookup */
114 int fld_server_lookup(struct lu_server_fld *fld,
115 const struct lu_context *ctx,
116 seqno_t seq, mdsno_t *mds)
118 return fld_index_lookup(fld, ctx, seq, mds);
120 EXPORT_SYMBOL(fld_server_lookup);
122 static int fld_server_handle(struct lu_server_fld *fld,
123 const struct lu_context *ctx,
124 __u32 opc, struct md_fld *mf,
125 struct fld_thread_info *info)
132 rc = fld_server_create(fld, ctx,
133 mf->mf_seq, mf->mf_mds);
135 /* do not return -EEXIST error for resent case */
136 if ((info->fti_flags & FLD_MSG_RESENT) && rc == -EEXIST)
140 rc = fld_server_delete(fld, ctx, mf->mf_seq);
142 /* do not return -ENOENT error for resent case */
143 if ((info->fti_flags & FLD_MSG_RESENT) && rc == -ENOENT)
147 rc = fld_server_lookup(fld, ctx,
148 mf->mf_seq, &mf->mf_mds);
158 static int fld_req_handle(struct ptlrpc_request *req,
159 struct fld_thread_info *info)
161 struct lu_site *site;
168 site = req->rq_export->exp_obd->obd_lu_dev->ld_site;
170 rc = req_capsule_pack(&info->fti_pill);
174 opc = req_capsule_client_get(&info->fti_pill, &RMF_FLD_OPC);
176 in = req_capsule_client_get(&info->fti_pill, &RMF_FLD_MDFLD);
179 out = req_capsule_server_get(&info->fti_pill, &RMF_FLD_MDFLD);
184 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)
185 info->fti_flags |= FLD_MSG_REPLAY;
187 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT)
188 info->fti_flags |= FLD_MSG_RESENT;
190 rc = fld_server_handle(site->ls_server_fld,
191 req->rq_svc_thread->t_ctx,
199 static void fld_thread_info_init(struct ptlrpc_request *req,
200 struct fld_thread_info *info)
206 /* mark rep buffer as req-layout stuff expects */
207 for (i = 0; i < ARRAY_SIZE(info->fti_rep_buf_size); i++)
208 info->fti_rep_buf_size[i] = -1;
210 /* init request capsule */
211 req_capsule_init(&info->fti_pill, req, RCL_SERVER,
212 info->fti_rep_buf_size);
214 req_capsule_set(&info->fti_pill, &RQF_FLD_QUERY);
217 static void fld_thread_info_fini(struct fld_thread_info *info)
219 req_capsule_fini(&info->fti_pill);
222 static int fld_handle(struct ptlrpc_request *req)
224 const struct lu_context *ctx;
225 struct fld_thread_info *info;
228 ctx = req->rq_svc_thread->t_ctx;
229 LASSERT(ctx != NULL);
230 LASSERT(ctx->lc_thread == req->rq_svc_thread);
232 info = lu_context_key_get(ctx, &fld_thread_key);
233 LASSERT(info != NULL);
235 fld_thread_info_init(req, info);
236 rc = fld_req_handle(req, info);
237 fld_thread_info_fini(info);
243 * Entry point for handling FLD RPCs called from MDT.
245 int fld_query(struct com_thread_info *info)
247 return fld_handle(info->cti_pill.rc_req);
249 EXPORT_SYMBOL(fld_query);
252 * Returns true, if fid is local to this server node.
254 * WARNING: this function is *not* guaranteed to return false if fid is
255 * remote: it makes an educated conservative guess only.
257 * fid_is_local() is supposed to be used in assertion checks only.
259 int fid_is_local(struct lu_site *site, const struct lu_fid *fid)
263 result = 1; /* conservatively assume fid is local */
264 if (site->ls_client_fld != NULL) {
268 rc = fld_cache_lookup(site->ls_client_fld->lcf_cache,
271 result = (mds == site->ls_node_id);
275 EXPORT_SYMBOL(fid_is_local);
277 static void fld_server_proc_fini(struct lu_server_fld *fld);
280 static int fld_server_proc_init(struct lu_server_fld *fld)
285 fld->lsf_proc_dir = lprocfs_register(fld->lsf_name,
287 fld_server_proc_list, fld);
288 if (IS_ERR(fld->lsf_proc_dir)) {
289 rc = PTR_ERR(fld->lsf_proc_dir);
296 static void fld_server_proc_fini(struct lu_server_fld *fld)
299 if (fld->lsf_proc_dir != NULL) {
300 if (!IS_ERR(fld->lsf_proc_dir))
301 lprocfs_remove(fld->lsf_proc_dir);
302 fld->lsf_proc_dir = NULL;
307 static int fld_server_proc_init(struct lu_server_fld *fld)
312 static void fld_server_proc_fini(struct lu_server_fld *fld)
318 int fld_server_init(struct lu_server_fld *fld, struct dt_device *dt,
319 const char *uuid, const struct lu_context *ctx)
324 snprintf(fld->lsf_name, sizeof(fld->lsf_name),
325 "%s-srv-%s", LUSTRE_FLD_NAME, uuid);
327 rc = fld_index_init(fld, ctx, dt);
331 rc = fld_server_proc_init(fld);
338 fld_server_fini(fld, ctx);
340 CDEBUG(D_INFO|D_WARNING, "Server FLD\n");
343 EXPORT_SYMBOL(fld_server_init);
345 void fld_server_fini(struct lu_server_fld *fld,
346 const struct lu_context *ctx)
350 fld_server_proc_fini(fld);
351 fld_index_fini(fld, ctx);
355 EXPORT_SYMBOL(fld_server_fini);
357 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
358 MODULE_DESCRIPTION("Lustre FLD");
359 MODULE_LICENSE("GPL");
361 cfs_module(mdd, "0.1.0", fld_mod_init, fld_mod_exit);