Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 | /*
* GPL HEADER START
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 only,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is included
* in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; If not, see
* http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
* GPL HEADER END
*/
/*
* Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2011, 2013, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Lustre is a trademark of Sun Microsystems, Inc.
*
* lustre/fld/fld_request.c
*
* FLD (Fids Location Database)
*
* Author: Yury Umanets <umka@clusterfs.com>
*/
#define DEBUG_SUBSYSTEM S_FLD
# include <linux/libcfs/libcfs.h>
# include <linux/module.h>
# include <asm/div64.h>
#include <obd.h>
#include <obd_class.h>
#include <lustre_ver.h>
#include <obd_support.h>
#include <lprocfs_status.h>
#include <dt_object.h>
#include <md_object.h>
#include <lustre_req_layout.h>
#include <lustre_fld.h>
#include <lustre_mdc.h>
#include "fld_internal.h"
/* TODO: these 3 functions are copies of flow-control code from mdc_lib.c
* It should be common thing. The same about mdc RPC lock */
static int fld_req_avail(struct client_obd *cli, struct mdc_cache_waiter *mcw)
{
int rc;
client_obd_list_lock(&cli->cl_loi_list_lock);
rc = list_empty(&mcw->mcw_entry);
client_obd_list_unlock(&cli->cl_loi_list_lock);
return rc;
};
static void fld_enter_request(struct client_obd *cli)
{
struct mdc_cache_waiter mcw;
struct l_wait_info lwi = { 0 };
client_obd_list_lock(&cli->cl_loi_list_lock);
if (cli->cl_r_in_flight >= cli->cl_max_rpcs_in_flight) {
list_add_tail(&mcw.mcw_entry, &cli->cl_cache_waiters);
init_waitqueue_head(&mcw.mcw_waitq);
client_obd_list_unlock(&cli->cl_loi_list_lock);
l_wait_event(mcw.mcw_waitq, fld_req_avail(cli, &mcw), &lwi);
} else {
cli->cl_r_in_flight++;
client_obd_list_unlock(&cli->cl_loi_list_lock);
}
}
static void fld_exit_request(struct client_obd *cli)
{
struct list_head *l, *tmp;
struct mdc_cache_waiter *mcw;
client_obd_list_lock(&cli->cl_loi_list_lock);
cli->cl_r_in_flight--;
list_for_each_safe(l, tmp, &cli->cl_cache_waiters) {
if (cli->cl_r_in_flight >= cli->cl_max_rpcs_in_flight) {
/* No free request slots anymore */
break;
}
mcw = list_entry(l, struct mdc_cache_waiter, mcw_entry);
list_del_init(&mcw->mcw_entry);
cli->cl_r_in_flight++;
wake_up(&mcw->mcw_waitq);
}
client_obd_list_unlock(&cli->cl_loi_list_lock);
}
static int fld_rrb_hash(struct lu_client_fld *fld,
seqno_t seq)
{
LASSERT(fld->lcf_count > 0);
return do_div(seq, fld->lcf_count);
}
static struct lu_fld_target *
fld_rrb_scan(struct lu_client_fld *fld, seqno_t seq)
{
struct lu_fld_target *target;
int hash;
/* Because almost all of special sequence located in MDT0,
* it should go to index 0 directly, instead of calculating
* hash again, and also if other MDTs is not being connected,
* the fld lookup requests(for seq on MDT0) should not be
* blocked because of other MDTs */
if (fid_seq_is_norm(seq))
hash = fld_rrb_hash(fld, seq);
else
hash = 0;
list_for_each_entry(target, &fld->lcf_targets, ft_chain) {
if (target->ft_idx == hash)
return target;
}
CERROR("%s: Can't find target by hash %d (seq "LPX64"). "
"Targets (%d):\n", fld->lcf_name, hash, seq,
fld->lcf_count);
list_for_each_entry(target, &fld->lcf_targets, ft_chain) {
const char *srv_name = target->ft_srv != NULL ?
target->ft_srv->lsf_name : "<null>";
const char *exp_name = target->ft_exp != NULL ?
(char *)target->ft_exp->exp_obd->obd_uuid.uuid :
"<null>";
CERROR(" exp: 0x%p (%s), srv: 0x%p (%s), idx: "LPU64"\n",
target->ft_exp, exp_name, target->ft_srv,
srv_name, target->ft_idx);
}
/*
* If target is not found, there is logical error anyway, so here is
* LBUG() to catch this situation.
*/
LBUG();
return NULL;
}
struct lu_fld_hash fld_hash[] = {
{
.fh_name = "RRB",
.fh_hash_func = fld_rrb_hash,
.fh_scan_func = fld_rrb_scan
},
{
0,
}
};
static struct lu_fld_target *
fld_client_get_target(struct lu_client_fld *fld, seqno_t seq)
{
struct lu_fld_target *target;
LASSERT(fld->lcf_hash != NULL);
spin_lock(&fld->lcf_lock);
target = fld->lcf_hash->fh_scan_func(fld, seq);
spin_unlock(&fld->lcf_lock);
if (target != NULL) {
CDEBUG(D_INFO, "%s: Found target (idx "LPU64
") by seq "LPX64"\n", fld->lcf_name,
target->ft_idx, seq);
}
return target;
}
/*
* Add export to FLD. This is usually done by CMM and LMV as they are main users
* of FLD module.
*/
int fld_client_add_target(struct lu_client_fld *fld,
struct lu_fld_target *tar)
{
const char *name;
struct lu_fld_target *target, *tmp;
LASSERT(tar != NULL);
name = fld_target_name(tar);
LASSERT(name != NULL);
LASSERT(tar->ft_srv != NULL || tar->ft_exp != NULL);
if (fld->lcf_flags != LUSTRE_FLD_INIT) {
CERROR("%s: Attempt to add target %s (idx "LPU64") "
"on fly - skip it\n", fld->lcf_name, name,
tar->ft_idx);
return 0;
} else {
CDEBUG(D_INFO, "%s: Adding target %s (idx "
LPU64")\n", fld->lcf_name, name, tar->ft_idx);
}
OBD_ALLOC_PTR(target);
if (target == NULL)
return -ENOMEM;
spin_lock(&fld->lcf_lock);
list_for_each_entry(tmp, &fld->lcf_targets, ft_chain) {
if (tmp->ft_idx == tar->ft_idx) {
spin_unlock(&fld->lcf_lock);
OBD_FREE_PTR(target);
CERROR("Target %s exists in FLD and known as %s:#"LPU64"\n",
name, fld_target_name(tmp), tmp->ft_idx);
return -EEXIST;
}
}
target->ft_exp = tar->ft_exp;
if (target->ft_exp != NULL)
class_export_get(target->ft_exp);
target->ft_srv = tar->ft_srv;
target->ft_idx = tar->ft_idx;
list_add_tail(&target->ft_chain,
&fld->lcf_targets);
fld->lcf_count++;
spin_unlock(&fld->lcf_lock);
return 0;
}
EXPORT_SYMBOL(fld_client_add_target);
/* Remove export from FLD */
int fld_client_del_target(struct lu_client_fld *fld, __u64 idx)
{
struct lu_fld_target *target, *tmp;
spin_lock(&fld->lcf_lock);
list_for_each_entry_safe(target, tmp,
&fld->lcf_targets, ft_chain) {
if (target->ft_idx == idx) {
fld->lcf_count--;
list_del(&target->ft_chain);
spin_unlock(&fld->lcf_lock);
if (target->ft_exp != NULL)
class_export_put(target->ft_exp);
OBD_FREE_PTR(target);
return 0;
}
}
spin_unlock(&fld->lcf_lock);
return -ENOENT;
}
EXPORT_SYMBOL(fld_client_del_target);
#ifdef LPROCFS
struct proc_dir_entry *fld_type_proc_dir = NULL;
static int fld_client_proc_init(struct lu_client_fld *fld)
{
int rc;
fld->lcf_proc_dir = lprocfs_register(fld->lcf_name,
fld_type_proc_dir,
NULL, NULL);
if (IS_ERR(fld->lcf_proc_dir)) {
CERROR("%s: LProcFS failed in fld-init\n",
fld->lcf_name);
rc = PTR_ERR(fld->lcf_proc_dir);
return rc;
}
rc = lprocfs_add_vars(fld->lcf_proc_dir,
fld_client_proc_list, fld);
if (rc) {
CERROR("%s: Can't init FLD proc, rc %d\n",
fld->lcf_name, rc);
GOTO(out_cleanup, rc);
}
return 0;
out_cleanup:
fld_client_proc_fini(fld);
return rc;
}
void fld_client_proc_fini(struct lu_client_fld *fld)
{
if (fld->lcf_proc_dir) {
if (!IS_ERR(fld->lcf_proc_dir))
lprocfs_remove(&fld->lcf_proc_dir);
fld->lcf_proc_dir = NULL;
}
}
#else
static int fld_client_proc_init(struct lu_client_fld *fld)
{
return 0;
}
void fld_client_proc_fini(struct lu_client_fld *fld)
{
return;
}
#endif
EXPORT_SYMBOL(fld_client_proc_fini);
static inline int hash_is_sane(int hash)
{
return (hash >= 0 && hash < ARRAY_SIZE(fld_hash));
}
int fld_client_init(struct lu_client_fld *fld,
const char *prefix, int hash)
{
int cache_size, cache_threshold;
int rc;
LASSERT(fld != NULL);
snprintf(fld->lcf_name, sizeof(fld->lcf_name),
"cli-%s", prefix);
if (!hash_is_sane(hash)) {
CERROR("%s: Wrong hash function %#x\n",
fld->lcf_name, hash);
return -EINVAL;
}
fld->lcf_count = 0;
spin_lock_init(&fld->lcf_lock);
fld->lcf_hash = &fld_hash[hash];
fld->lcf_flags = LUSTRE_FLD_INIT;
INIT_LIST_HEAD(&fld->lcf_targets);
cache_size = FLD_CLIENT_CACHE_SIZE /
sizeof(struct fld_cache_entry);
cache_threshold = cache_size *
FLD_CLIENT_CACHE_THRESHOLD / 100;
fld->lcf_cache = fld_cache_init(fld->lcf_name,
cache_size, cache_threshold);
if (IS_ERR(fld->lcf_cache)) {
rc = PTR_ERR(fld->lcf_cache);
fld->lcf_cache = NULL;
GOTO(out, rc);
}
rc = fld_client_proc_init(fld);
if (rc)
GOTO(out, rc);
out:
if (rc)
fld_client_fini(fld);
else
CDEBUG(D_INFO, "%s: Using \"%s\" hash\n",
fld->lcf_name, fld->lcf_hash->fh_name);
return rc;
}
EXPORT_SYMBOL(fld_client_init);
void fld_client_fini(struct lu_client_fld *fld)
{
struct lu_fld_target *target, *tmp;
spin_lock(&fld->lcf_lock);
list_for_each_entry_safe(target, tmp,
&fld->lcf_targets, ft_chain) {
fld->lcf_count--;
list_del(&target->ft_chain);
if (target->ft_exp != NULL)
class_export_put(target->ft_exp);
OBD_FREE_PTR(target);
}
spin_unlock(&fld->lcf_lock);
if (fld->lcf_cache != NULL) {
if (!IS_ERR(fld->lcf_cache))
fld_cache_fini(fld->lcf_cache);
fld->lcf_cache = NULL;
}
}
EXPORT_SYMBOL(fld_client_fini);
int fld_client_rpc(struct obd_export *exp,
struct lu_seq_range *range, __u32 fld_op)
{
struct ptlrpc_request *req;
struct lu_seq_range *prange;
__u32 *op;
int rc;
struct obd_import *imp;
LASSERT(exp != NULL);
imp = class_exp2cliimp(exp);
req = ptlrpc_request_alloc_pack(imp, &RQF_FLD_QUERY, LUSTRE_MDS_VERSION,
FLD_QUERY);
if (req == NULL)
return -ENOMEM;
op = req_capsule_client_get(&req->rq_pill, &RMF_FLD_OPC);
*op = fld_op;
prange = req_capsule_client_get(&req->rq_pill, &RMF_FLD_MDFLD);
*prange = *range;
ptlrpc_request_set_replen(req);
req->rq_request_portal = FLD_REQUEST_PORTAL;
ptlrpc_at_set_req_timeout(req);
if (fld_op == FLD_LOOKUP &&
imp->imp_connect_flags_orig & OBD_CONNECT_MDS_MDS)
req->rq_allow_replay = 1;
if (fld_op != FLD_LOOKUP)
mdc_get_rpc_lock(exp->exp_obd->u.cli.cl_rpc_lock, NULL);
fld_enter_request(&exp->exp_obd->u.cli);
rc = ptlrpc_queue_wait(req);
fld_exit_request(&exp->exp_obd->u.cli);
if (fld_op != FLD_LOOKUP)
mdc_put_rpc_lock(exp->exp_obd->u.cli.cl_rpc_lock, NULL);
if (rc)
GOTO(out_req, rc);
prange = req_capsule_server_get(&req->rq_pill, &RMF_FLD_MDFLD);
if (prange == NULL)
GOTO(out_req, rc = -EFAULT);
*range = *prange;
out_req:
ptlrpc_req_finished(req);
return rc;
}
int fld_client_lookup(struct lu_client_fld *fld, seqno_t seq, mdsno_t *mds,
__u32 flags, const struct lu_env *env)
{
struct lu_seq_range res = { 0 };
struct lu_fld_target *target;
int rc;
fld->lcf_flags |= LUSTRE_FLD_RUN;
rc = fld_cache_lookup(fld->lcf_cache, seq, &res);
if (rc == 0) {
*mds = res.lsr_index;
return 0;
}
/* Can not find it in the cache */
target = fld_client_get_target(fld, seq);
LASSERT(target != NULL);
CDEBUG(D_INFO, "%s: Lookup fld entry (seq: "LPX64") on "
"target %s (idx "LPU64")\n", fld->lcf_name, seq,
fld_target_name(target), target->ft_idx);
res.lsr_start = seq;
fld_range_set_type(&res, flags);
rc = fld_client_rpc(target->ft_exp, &res, FLD_LOOKUP);
if (rc == 0) {
*mds = res.lsr_index;
fld_cache_insert(fld->lcf_cache, &res);
}
return rc;
}
EXPORT_SYMBOL(fld_client_lookup);
void fld_client_flush(struct lu_client_fld *fld)
{
fld_cache_flush(fld->lcf_cache);
}
EXPORT_SYMBOL(fld_client_flush);
static int __init fld_mod_init(void)
{
fld_type_proc_dir = lprocfs_register(LUSTRE_FLD_NAME,
proc_lustre_root,
NULL, NULL);
if (IS_ERR(fld_type_proc_dir))
return PTR_ERR(fld_type_proc_dir);
return 0;
}
static void __exit fld_mod_exit(void)
{
if (fld_type_proc_dir != NULL && !IS_ERR(fld_type_proc_dir)) {
lprocfs_remove(&fld_type_proc_dir);
fld_type_proc_dir = NULL;
}
}
MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
MODULE_DESCRIPTION("Lustre FLD");
MODULE_LICENSE("GPL");
module_init(fld_mod_init)
module_exit(fld_mod_exit)
|