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"
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 cfs_proc_dir_entry_t *fld_type_proc_dir = NULL;
84 static int __init fld_mod_init(void)
86 printk(KERN_INFO "Lustre: Fid Location Database; "
87 "info@clusterfs.com\n");
89 fld_type_proc_dir = lprocfs_register(LUSTRE_FLD_NAME,
92 if (IS_ERR(fld_type_proc_dir))
93 return PTR_ERR(fld_type_proc_dir);
95 lu_context_key_register(&fld_thread_key);
99 static void __exit fld_mod_exit(void)
101 lu_context_key_degister(&fld_thread_key);
102 if (fld_type_proc_dir != NULL && !IS_ERR(fld_type_proc_dir)) {
103 lprocfs_remove(fld_type_proc_dir);
104 fld_type_proc_dir = NULL;
108 /* insert index entry and update cache */
109 int fld_server_create(struct lu_server_fld *fld,
110 const struct lu_context *ctx,
111 seqno_t seq, mdsno_t mds)
113 return fld_index_create(fld, ctx, seq, mds);
115 EXPORT_SYMBOL(fld_server_create);
117 /* delete index entry */
118 int fld_server_delete(struct lu_server_fld *fld,
119 const struct lu_context *ctx,
122 return fld_index_delete(fld, ctx, seq);
124 EXPORT_SYMBOL(fld_server_delete);
126 /* issue on-disk index lookup */
127 int fld_server_lookup(struct lu_server_fld *fld,
128 const struct lu_context *ctx,
129 seqno_t seq, mdsno_t *mds)
131 return fld_index_lookup(fld, ctx, seq, mds);
133 EXPORT_SYMBOL(fld_server_lookup);
135 static int fld_server_handle(struct lu_server_fld *fld,
136 const struct lu_context *ctx,
137 __u32 opc, struct md_fld *mf,
138 struct fld_thread_info *info)
145 rc = fld_server_create(fld, ctx,
146 mf->mf_seq, mf->mf_mds);
148 /* do not return -EEXIST error for resent case */
149 if ((info->fti_flags & MSG_RESENT) && rc == -EEXIST)
153 rc = fld_server_delete(fld, ctx, mf->mf_seq);
155 /* do not return -ENOENT error for resent case */
156 if ((info->fti_flags & MSG_RESENT) && rc == -ENOENT)
160 rc = fld_server_lookup(fld, ctx,
161 mf->mf_seq, &mf->mf_mds);
171 static int fld_req_handle(struct ptlrpc_request *req,
172 struct fld_thread_info *info)
174 struct lu_site *site;
181 site = req->rq_export->exp_obd->obd_lu_dev->ld_site;
183 rc = req_capsule_pack(&info->fti_pill);
187 opc = req_capsule_client_get(&info->fti_pill, &RMF_FLD_OPC);
189 in = req_capsule_client_get(&info->fti_pill, &RMF_FLD_MDFLD);
192 out = req_capsule_server_get(&info->fti_pill, &RMF_FLD_MDFLD);
197 rc = fld_server_handle(site->ls_server_fld,
198 req->rq_svc_thread->t_ctx,
206 static void fld_thread_info_init(struct ptlrpc_request *req,
207 struct fld_thread_info *info)
211 info->fti_flags = lustre_msg_get_flags(req->rq_reqmsg);
213 /* mark rep buffer as req-layout stuff expects */
214 for (i = 0; i < ARRAY_SIZE(info->fti_rep_buf_size); i++)
215 info->fti_rep_buf_size[i] = -1;
217 /* init request capsule */
218 req_capsule_init(&info->fti_pill, req, RCL_SERVER,
219 info->fti_rep_buf_size);
221 req_capsule_set(&info->fti_pill, &RQF_FLD_QUERY);
224 static void fld_thread_info_fini(struct fld_thread_info *info)
226 req_capsule_fini(&info->fti_pill);
229 static int fld_handle(struct ptlrpc_request *req)
231 const struct lu_context *ctx;
232 struct fld_thread_info *info;
235 ctx = req->rq_svc_thread->t_ctx;
236 LASSERT(ctx != NULL);
237 LASSERT(ctx->lc_thread == req->rq_svc_thread);
239 info = lu_context_key_get(ctx, &fld_thread_key);
240 LASSERT(info != NULL);
242 fld_thread_info_init(req, info);
243 rc = fld_req_handle(req, info);
244 fld_thread_info_fini(info);
250 * Entry point for handling FLD RPCs called from MDT.
252 int fld_query(struct com_thread_info *info)
254 return fld_handle(info->cti_pill.rc_req);
256 EXPORT_SYMBOL(fld_query);
259 * Returns true, if fid is local to this server node.
261 * WARNING: this function is *not* guaranteed to return false if fid is
262 * remote: it makes an educated conservative guess only.
264 * fid_is_local() is supposed to be used in assertion checks only.
266 int fid_is_local(struct lu_site *site, const struct lu_fid *fid)
270 result = 1; /* conservatively assume fid is local */
271 if (site->ls_client_fld != NULL) {
275 rc = fld_cache_lookup(site->ls_client_fld->lcf_cache,
278 result = (mds == site->ls_node_id);
282 EXPORT_SYMBOL(fid_is_local);
284 static void fld_server_proc_fini(struct lu_server_fld *fld);
287 static int fld_server_proc_init(struct lu_server_fld *fld)
292 fld->lsf_proc_dir = lprocfs_register(fld->lsf_name,
294 fld_server_proc_list, fld);
295 if (IS_ERR(fld->lsf_proc_dir)) {
296 rc = PTR_ERR(fld->lsf_proc_dir);
303 static void fld_server_proc_fini(struct lu_server_fld *fld)
306 if (fld->lsf_proc_dir != NULL) {
307 if (!IS_ERR(fld->lsf_proc_dir))
308 lprocfs_remove(fld->lsf_proc_dir);
309 fld->lsf_proc_dir = NULL;
314 static int fld_server_proc_init(struct lu_server_fld *fld)
319 static void fld_server_proc_fini(struct lu_server_fld *fld)
325 int fld_server_init(struct lu_server_fld *fld, struct dt_device *dt,
326 const char *prefix, const struct lu_context *ctx)
331 snprintf(fld->lsf_name, sizeof(fld->lsf_name),
334 rc = fld_index_init(fld, ctx, dt);
338 rc = fld_server_proc_init(fld);
345 fld_server_fini(fld, ctx);
348 EXPORT_SYMBOL(fld_server_init);
350 void fld_server_fini(struct lu_server_fld *fld,
351 const struct lu_context *ctx)
355 fld_server_proc_fini(fld);
356 fld_index_fini(fld, ctx);
360 EXPORT_SYMBOL(fld_server_fini);
362 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
363 MODULE_DESCRIPTION("Lustre FLD");
364 MODULE_LICENSE("GPL");
366 cfs_module(mdd, "0.1.0", fld_mod_init, fld_mod_exit);