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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 | /*
* 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) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2011, 2012, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Lustre is a trademark of Sun Microsystems, Inc.
*
* cl code shared between vvp and liblustre (and other Lustre clients in the
* future).
*
* Author: Nikita Danilov <nikita.danilov@sun.com>
*/
#define DEBUG_SUBSYSTEM S_LLITE
#include "../../include/linux/libcfs/libcfs.h"
# include <linux/fs.h>
# include <linux/sched.h>
# include <linux/mm.h>
# include <linux/quotaops.h>
# include <linux/highmem.h>
# include <linux/pagemap.h>
# include <linux/rbtree.h>
#include "../include/obd.h"
#include "../include/obd_support.h"
#include "../include/lustre_fid.h"
#include "../include/lustre_lite.h"
#include "../include/lustre_dlm.h"
#include "../include/lustre_ver.h"
#include "../include/lustre_mdc.h"
#include "../include/cl_object.h"
#include "../include/lclient.h"
#include "../llite/llite_internal.h"
static const struct cl_req_operations ccc_req_ops;
/*
* ccc_ prefix stands for "Common Client Code".
*/
static struct kmem_cache *ccc_lock_kmem;
static struct kmem_cache *ccc_object_kmem;
static struct kmem_cache *ccc_thread_kmem;
static struct kmem_cache *ccc_session_kmem;
static struct kmem_cache *ccc_req_kmem;
static struct lu_kmem_descr ccc_caches[] = {
{
.ckd_cache = &ccc_lock_kmem,
.ckd_name = "ccc_lock_kmem",
.ckd_size = sizeof(struct ccc_lock)
},
{
.ckd_cache = &ccc_object_kmem,
.ckd_name = "ccc_object_kmem",
.ckd_size = sizeof(struct ccc_object)
},
{
.ckd_cache = &ccc_thread_kmem,
.ckd_name = "ccc_thread_kmem",
.ckd_size = sizeof(struct ccc_thread_info),
},
{
.ckd_cache = &ccc_session_kmem,
.ckd_name = "ccc_session_kmem",
.ckd_size = sizeof(struct ccc_session)
},
{
.ckd_cache = &ccc_req_kmem,
.ckd_name = "ccc_req_kmem",
.ckd_size = sizeof(struct ccc_req)
},
{
.ckd_cache = NULL
}
};
/*****************************************************************************
*
* Vvp device and device type functions.
*
*/
void *ccc_key_init(const struct lu_context *ctx, struct lu_context_key *key)
{
struct ccc_thread_info *info;
OBD_SLAB_ALLOC_PTR_GFP(info, ccc_thread_kmem, GFP_NOFS);
if (info == NULL)
info = ERR_PTR(-ENOMEM);
return info;
}
void ccc_key_fini(const struct lu_context *ctx,
struct lu_context_key *key, void *data)
{
struct ccc_thread_info *info = data;
OBD_SLAB_FREE_PTR(info, ccc_thread_kmem);
}
void *ccc_session_key_init(const struct lu_context *ctx,
struct lu_context_key *key)
{
struct ccc_session *session;
OBD_SLAB_ALLOC_PTR_GFP(session, ccc_session_kmem, GFP_NOFS);
if (session == NULL)
session = ERR_PTR(-ENOMEM);
return session;
}
void ccc_session_key_fini(const struct lu_context *ctx,
struct lu_context_key *key, void *data)
{
struct ccc_session *session = data;
OBD_SLAB_FREE_PTR(session, ccc_session_kmem);
}
struct lu_context_key ccc_key = {
.lct_tags = LCT_CL_THREAD,
.lct_init = ccc_key_init,
.lct_fini = ccc_key_fini
};
struct lu_context_key ccc_session_key = {
.lct_tags = LCT_SESSION,
.lct_init = ccc_session_key_init,
.lct_fini = ccc_session_key_fini
};
/* type constructor/destructor: ccc_type_{init,fini,start,stop}(). */
/* LU_TYPE_INIT_FINI(ccc, &ccc_key, &ccc_session_key); */
int ccc_device_init(const struct lu_env *env, struct lu_device *d,
const char *name, struct lu_device *next)
{
struct ccc_device *vdv;
int rc;
vdv = lu2ccc_dev(d);
vdv->cdv_next = lu2cl_dev(next);
LASSERT(d->ld_site != NULL && next->ld_type != NULL);
next->ld_site = d->ld_site;
rc = next->ld_type->ldt_ops->ldto_device_init(
env, next, next->ld_type->ldt_name, NULL);
if (rc == 0) {
lu_device_get(next);
lu_ref_add(&next->ld_reference, "lu-stack", &lu_site_init);
}
return rc;
}
struct lu_device *ccc_device_fini(const struct lu_env *env,
struct lu_device *d)
{
return cl2lu_dev(lu2ccc_dev(d)->cdv_next);
}
struct lu_device *ccc_device_alloc(const struct lu_env *env,
struct lu_device_type *t,
struct lustre_cfg *cfg,
const struct lu_device_operations *luops,
const struct cl_device_operations *clops)
{
struct ccc_device *vdv;
struct lu_device *lud;
struct cl_site *site;
int rc;
OBD_ALLOC_PTR(vdv);
if (vdv == NULL)
return ERR_PTR(-ENOMEM);
lud = &vdv->cdv_cl.cd_lu_dev;
cl_device_init(&vdv->cdv_cl, t);
ccc2lu_dev(vdv)->ld_ops = luops;
vdv->cdv_cl.cd_ops = clops;
OBD_ALLOC_PTR(site);
if (site != NULL) {
rc = cl_site_init(site, &vdv->cdv_cl);
if (rc == 0)
rc = lu_site_init_finish(&site->cs_lu);
else {
LASSERT(lud->ld_site == NULL);
CERROR("Cannot init lu_site, rc %d.\n", rc);
OBD_FREE_PTR(site);
}
} else
rc = -ENOMEM;
if (rc != 0) {
ccc_device_free(env, lud);
lud = ERR_PTR(rc);
}
return lud;
}
struct lu_device *ccc_device_free(const struct lu_env *env,
struct lu_device *d)
{
struct ccc_device *vdv = lu2ccc_dev(d);
struct cl_site *site = lu2cl_site(d->ld_site);
struct lu_device *next = cl2lu_dev(vdv->cdv_next);
if (d->ld_site != NULL) {
cl_site_fini(site);
OBD_FREE_PTR(site);
}
cl_device_fini(lu2cl_dev(d));
OBD_FREE_PTR(vdv);
return next;
}
int ccc_req_init(const struct lu_env *env, struct cl_device *dev,
struct cl_req *req)
{
struct ccc_req *vrq;
int result;
OBD_SLAB_ALLOC_PTR_GFP(vrq, ccc_req_kmem, GFP_NOFS);
if (vrq != NULL) {
cl_req_slice_add(req, &vrq->crq_cl, dev, &ccc_req_ops);
result = 0;
} else
result = -ENOMEM;
return result;
}
/**
* An `emergency' environment used by ccc_inode_fini() when cl_env_get()
* fails. Access to this environment is serialized by ccc_inode_fini_guard
* mutex.
*/
static struct lu_env *ccc_inode_fini_env;
/**
* A mutex serializing calls to slp_inode_fini() under extreme memory
* pressure, when environments cannot be allocated.
*/
static DEFINE_MUTEX(ccc_inode_fini_guard);
static int dummy_refcheck;
int ccc_global_init(struct lu_device_type *device_type)
{
int result;
result = lu_kmem_init(ccc_caches);
if (result)
return result;
result = lu_device_type_init(device_type);
if (result)
goto out_kmem;
ccc_inode_fini_env = cl_env_alloc(&dummy_refcheck,
LCT_REMEMBER|LCT_NOREF);
if (IS_ERR(ccc_inode_fini_env)) {
result = PTR_ERR(ccc_inode_fini_env);
goto out_device;
}
ccc_inode_fini_env->le_ctx.lc_cookie = 0x4;
return 0;
out_device:
lu_device_type_fini(device_type);
out_kmem:
lu_kmem_fini(ccc_caches);
return result;
}
void ccc_global_fini(struct lu_device_type *device_type)
{
if (ccc_inode_fini_env != NULL) {
cl_env_put(ccc_inode_fini_env, &dummy_refcheck);
ccc_inode_fini_env = NULL;
}
lu_device_type_fini(device_type);
lu_kmem_fini(ccc_caches);
}
/*****************************************************************************
*
* Object operations.
*
*/
struct lu_object *ccc_object_alloc(const struct lu_env *env,
const struct lu_object_header *unused,
struct lu_device *dev,
const struct cl_object_operations *clops,
const struct lu_object_operations *luops)
{
struct ccc_object *vob;
struct lu_object *obj;
OBD_SLAB_ALLOC_PTR_GFP(vob, ccc_object_kmem, GFP_NOFS);
if (vob != NULL) {
struct cl_object_header *hdr;
obj = ccc2lu(vob);
hdr = &vob->cob_header;
cl_object_header_init(hdr);
lu_object_init(obj, &hdr->coh_lu, dev);
lu_object_add_top(&hdr->coh_lu, obj);
vob->cob_cl.co_ops = clops;
obj->lo_ops = luops;
} else
obj = NULL;
return obj;
}
int ccc_object_init0(const struct lu_env *env,
struct ccc_object *vob,
const struct cl_object_conf *conf)
{
vob->cob_inode = conf->coc_inode;
vob->cob_transient_pages = 0;
cl_object_page_init(&vob->cob_cl, sizeof(struct ccc_page));
return 0;
}
int ccc_object_init(const struct lu_env *env, struct lu_object *obj,
const struct lu_object_conf *conf)
{
struct ccc_device *dev = lu2ccc_dev(obj->lo_dev);
struct ccc_object *vob = lu2ccc(obj);
struct lu_object *below;
struct lu_device *under;
int result;
under = &dev->cdv_next->cd_lu_dev;
below = under->ld_ops->ldo_object_alloc(env, obj->lo_header, under);
if (below != NULL) {
const struct cl_object_conf *cconf;
cconf = lu2cl_conf(conf);
INIT_LIST_HEAD(&vob->cob_pending_list);
lu_object_add(obj, below);
result = ccc_object_init0(env, vob, cconf);
} else
result = -ENOMEM;
return result;
}
void ccc_object_free(const struct lu_env *env, struct lu_object *obj)
{
struct ccc_object *vob = lu2ccc(obj);
lu_object_fini(obj);
lu_object_header_fini(obj->lo_header);
OBD_SLAB_FREE_PTR(vob, ccc_object_kmem);
}
int ccc_lock_init(const struct lu_env *env,
struct cl_object *obj, struct cl_lock *lock,
const struct cl_io *unused,
const struct cl_lock_operations *lkops)
{
struct ccc_lock *clk;
int result;
CLOBINVRNT(env, obj, ccc_object_invariant(obj));
OBD_SLAB_ALLOC_PTR_GFP(clk, ccc_lock_kmem, GFP_NOFS);
if (clk != NULL) {
cl_lock_slice_add(lock, &clk->clk_cl, obj, lkops);
result = 0;
} else
result = -ENOMEM;
return result;
}
int ccc_attr_set(const struct lu_env *env, struct cl_object *obj,
const struct cl_attr *attr, unsigned valid)
{
return 0;
}
int ccc_object_glimpse(const struct lu_env *env,
const struct cl_object *obj, struct ost_lvb *lvb)
{
struct inode *inode = ccc_object_inode(obj);
lvb->lvb_mtime = cl_inode_mtime(inode);
lvb->lvb_atime = cl_inode_atime(inode);
lvb->lvb_ctime = cl_inode_ctime(inode);
/*
* LU-417: Add dirty pages block count lest i_blocks reports 0, some
* "cp" or "tar" on remote node may think it's a completely sparse file
* and skip it.
*/
if (lvb->lvb_size > 0 && lvb->lvb_blocks == 0)
lvb->lvb_blocks = dirty_cnt(inode);
return 0;
}
int ccc_conf_set(const struct lu_env *env, struct cl_object *obj,
const struct cl_object_conf *conf)
{
/* TODO: destroy all pages attached to this object. */
return 0;
}
static void ccc_object_size_lock(struct cl_object *obj)
{
struct inode *inode = ccc_object_inode(obj);
cl_isize_lock(inode);
cl_object_attr_lock(obj);
}
static void ccc_object_size_unlock(struct cl_object *obj)
{
struct inode *inode = ccc_object_inode(obj);
cl_object_attr_unlock(obj);
cl_isize_unlock(inode);
}
/*****************************************************************************
*
* Page operations.
*
*/
struct page *ccc_page_vmpage(const struct lu_env *env,
const struct cl_page_slice *slice)
{
return cl2vm_page(slice);
}
int ccc_page_is_under_lock(const struct lu_env *env,
const struct cl_page_slice *slice,
struct cl_io *io)
{
struct ccc_io *cio = ccc_env_io(env);
struct cl_lock_descr *desc = &ccc_env_info(env)->cti_descr;
struct cl_page *page = slice->cpl_page;
int result;
if (io->ci_type == CIT_READ || io->ci_type == CIT_WRITE ||
io->ci_type == CIT_FAULT) {
if (cio->cui_fd->fd_flags & LL_FILE_GROUP_LOCKED)
result = -EBUSY;
else {
desc->cld_start = page->cp_index;
desc->cld_end = page->cp_index;
desc->cld_obj = page->cp_obj;
desc->cld_mode = CLM_READ;
result = cl_queue_match(&io->ci_lockset.cls_done,
desc) ? -EBUSY : 0;
}
} else
result = 0;
return result;
}
int ccc_fail(const struct lu_env *env, const struct cl_page_slice *slice)
{
/*
* Cached read?
*/
LBUG();
return 0;
}
void ccc_transient_page_verify(const struct cl_page *page)
{
}
int ccc_transient_page_own(const struct lu_env *env,
const struct cl_page_slice *slice,
struct cl_io *unused,
int nonblock)
{
ccc_transient_page_verify(slice->cpl_page);
return 0;
}
void ccc_transient_page_assume(const struct lu_env *env,
const struct cl_page_slice *slice,
struct cl_io *unused)
{
ccc_transient_page_verify(slice->cpl_page);
}
void ccc_transient_page_unassume(const struct lu_env *env,
const struct cl_page_slice *slice,
struct cl_io *unused)
{
ccc_transient_page_verify(slice->cpl_page);
}
void ccc_transient_page_disown(const struct lu_env *env,
const struct cl_page_slice *slice,
struct cl_io *unused)
{
ccc_transient_page_verify(slice->cpl_page);
}
void ccc_transient_page_discard(const struct lu_env *env,
const struct cl_page_slice *slice,
struct cl_io *unused)
{
struct cl_page *page = slice->cpl_page;
ccc_transient_page_verify(slice->cpl_page);
/*
* For transient pages, remove it from the radix tree.
*/
cl_page_delete(env, page);
}
int ccc_transient_page_prep(const struct lu_env *env,
const struct cl_page_slice *slice,
struct cl_io *unused)
{
/* transient page should always be sent. */
return 0;
}
/*****************************************************************************
*
* Lock operations.
*
*/
void ccc_lock_delete(const struct lu_env *env,
const struct cl_lock_slice *slice)
{
CLOBINVRNT(env, slice->cls_obj, ccc_object_invariant(slice->cls_obj));
}
void ccc_lock_fini(const struct lu_env *env, struct cl_lock_slice *slice)
{
struct ccc_lock *clk = cl2ccc_lock(slice);
OBD_SLAB_FREE_PTR(clk, ccc_lock_kmem);
}
int ccc_lock_enqueue(const struct lu_env *env,
const struct cl_lock_slice *slice,
struct cl_io *unused, __u32 enqflags)
{
CLOBINVRNT(env, slice->cls_obj, ccc_object_invariant(slice->cls_obj));
return 0;
}
int ccc_lock_unuse(const struct lu_env *env, const struct cl_lock_slice *slice)
{
CLOBINVRNT(env, slice->cls_obj, ccc_object_invariant(slice->cls_obj));
return 0;
}
int ccc_lock_wait(const struct lu_env *env, const struct cl_lock_slice *slice)
{
CLOBINVRNT(env, slice->cls_obj, ccc_object_invariant(slice->cls_obj));
return 0;
}
/**
* Implementation of cl_lock_operations::clo_fits_into() methods for ccc
* layer. This function is executed every time io finds an existing lock in
* the lock cache while creating new lock. This function has to decide whether
* cached lock "fits" into io.
*
* \param slice lock to be checked
* \param io IO that wants a lock.
*
* \see lov_lock_fits_into().
*/
int ccc_lock_fits_into(const struct lu_env *env,
const struct cl_lock_slice *slice,
const struct cl_lock_descr *need,
const struct cl_io *io)
{
const struct cl_lock *lock = slice->cls_lock;
const struct cl_lock_descr *descr = &lock->cll_descr;
const struct ccc_io *cio = ccc_env_io(env);
int result;
/*
* Work around DLM peculiarity: it assumes that glimpse
* (LDLM_FL_HAS_INTENT) lock is always LCK_PR, and returns reads lock
* when asked for LCK_PW lock with LDLM_FL_HAS_INTENT flag set. Make
* sure that glimpse doesn't get CLM_WRITE top-lock, so that it
* doesn't enqueue CLM_WRITE sub-locks.
*/
if (cio->cui_glimpse)
result = descr->cld_mode != CLM_WRITE;
/*
* Also, don't match incomplete write locks for read, otherwise read
* would enqueue missing sub-locks in the write mode.
*/
else if (need->cld_mode != descr->cld_mode)
result = lock->cll_state >= CLS_ENQUEUED;
else
result = 1;
return result;
}
/**
* Implements cl_lock_operations::clo_state() method for ccc layer, invoked
* whenever lock state changes. Transfers object attributes, that might be
* updated as a result of lock acquiring into inode.
*/
void ccc_lock_state(const struct lu_env *env,
const struct cl_lock_slice *slice,
enum cl_lock_state state)
{
struct cl_lock *lock = slice->cls_lock;
/*
* Refresh inode attributes when the lock is moving into CLS_HELD
* state, and only when this is a result of real enqueue, rather than
* of finding lock in the cache.
*/
if (state == CLS_HELD && lock->cll_state < CLS_HELD) {
struct cl_object *obj;
struct inode *inode;
obj = slice->cls_obj;
inode = ccc_object_inode(obj);
/* vmtruncate() sets the i_size
* under both a DLM lock and the
* ll_inode_size_lock(). If we don't get the
* ll_inode_size_lock() here we can match the DLM lock and
* reset i_size. generic_file_write can then trust the
* stale i_size when doing appending writes and effectively
* cancel the result of the truncate. Getting the
* ll_inode_size_lock() after the enqueue maintains the DLM
* -> ll_inode_size_lock() acquiring order. */
if (lock->cll_descr.cld_start == 0 &&
lock->cll_descr.cld_end == CL_PAGE_EOF)
cl_merge_lvb(env, inode);
}
}
/*****************************************************************************
*
* io operations.
*
*/
void ccc_io_fini(const struct lu_env *env, const struct cl_io_slice *ios)
{
struct cl_io *io = ios->cis_io;
CLOBINVRNT(env, io->ci_obj, ccc_object_invariant(io->ci_obj));
}
int ccc_io_one_lock_index(const struct lu_env *env, struct cl_io *io,
__u32 enqflags, enum cl_lock_mode mode,
pgoff_t start, pgoff_t end)
{
struct ccc_io *cio = ccc_env_io(env);
struct cl_lock_descr *descr = &cio->cui_link.cill_descr;
struct cl_object *obj = io->ci_obj;
CLOBINVRNT(env, obj, ccc_object_invariant(obj));
CDEBUG(D_VFSTRACE, "lock: %d [%lu, %lu]\n", mode, start, end);
memset(&cio->cui_link, 0, sizeof(cio->cui_link));
if (cio->cui_fd && (cio->cui_fd->fd_flags & LL_FILE_GROUP_LOCKED)) {
descr->cld_mode = CLM_GROUP;
descr->cld_gid = cio->cui_fd->fd_grouplock.cg_gid;
} else {
descr->cld_mode = mode;
}
descr->cld_obj = obj;
descr->cld_start = start;
descr->cld_end = end;
descr->cld_enq_flags = enqflags;
cl_io_lock_add(env, io, &cio->cui_link);
return 0;
}
void ccc_io_update_iov(const struct lu_env *env,
struct ccc_io *cio, struct cl_io *io)
{
size_t size = io->u.ci_rw.crw_count;
if (!cl_is_normalio(env, io) || cio->cui_iter == NULL)
return;
iov_iter_truncate(cio->cui_iter, size);
}
int ccc_io_one_lock(const struct lu_env *env, struct cl_io *io,
__u32 enqflags, enum cl_lock_mode mode,
loff_t start, loff_t end)
{
struct cl_object *obj = io->ci_obj;
return ccc_io_one_lock_index(env, io, enqflags, mode,
cl_index(obj, start), cl_index(obj, end));
}
void ccc_io_end(const struct lu_env *env, const struct cl_io_slice *ios)
{
CLOBINVRNT(env, ios->cis_io->ci_obj,
ccc_object_invariant(ios->cis_io->ci_obj));
}
void ccc_io_advance(const struct lu_env *env,
const struct cl_io_slice *ios,
size_t nob)
{
struct ccc_io *cio = cl2ccc_io(env, ios);
struct cl_io *io = ios->cis_io;
struct cl_object *obj = ios->cis_io->ci_obj;
CLOBINVRNT(env, obj, ccc_object_invariant(obj));
if (!cl_is_normalio(env, io))
return;
iov_iter_reexpand(cio->cui_iter, cio->cui_tot_count -= nob);
}
/**
* Helper function that if necessary adjusts file size (inode->i_size), when
* position at the offset \a pos is accessed. File size can be arbitrary stale
* on a Lustre client, but client at least knows KMS. If accessed area is
* inside [0, KMS], set file size to KMS, otherwise glimpse file size.
*
* Locking: cl_isize_lock is used to serialize changes to inode size and to
* protect consistency between inode size and cl_object
* attributes. cl_object_size_lock() protects consistency between cl_attr's of
* top-object and sub-objects.
*/
int ccc_prep_size(const struct lu_env *env, struct cl_object *obj,
struct cl_io *io, loff_t start, size_t count, int *exceed)
{
struct cl_attr *attr = ccc_env_thread_attr(env);
struct inode *inode = ccc_object_inode(obj);
loff_t pos = start + count - 1;
loff_t kms;
int result;
/*
* Consistency guarantees: following possibilities exist for the
* relation between region being accessed and real file size at this
* moment:
*
* (A): the region is completely inside of the file;
*
* (B-x): x bytes of region are inside of the file, the rest is
* outside;
*
* (C): the region is completely outside of the file.
*
* This classification is stable under DLM lock already acquired by
* the caller, because to change the class, other client has to take
* DLM lock conflicting with our lock. Also, any updates to ->i_size
* by other threads on this client are serialized by
* ll_inode_size_lock(). This guarantees that short reads are handled
* correctly in the face of concurrent writes and truncates.
*/
ccc_object_size_lock(obj);
result = cl_object_attr_get(env, obj, attr);
if (result == 0) {
kms = attr->cat_kms;
if (pos > kms) {
/*
* A glimpse is necessary to determine whether we
* return a short read (B) or some zeroes at the end
* of the buffer (C)
*/
ccc_object_size_unlock(obj);
result = cl_glimpse_lock(env, io, inode, obj, 0);
if (result == 0 && exceed != NULL) {
/* If objective page index exceed end-of-file
* page index, return directly. Do not expect
* kernel will check such case correctly.
* linux-2.6.18-128.1.1 miss to do that.
* --bug 17336 */
loff_t size = cl_isize_read(inode);
loff_t cur_index = start >> PAGE_CACHE_SHIFT;
loff_t size_index = ((size - 1) >> PAGE_CACHE_SHIFT);
if ((size == 0 && cur_index != 0) ||
size_index < cur_index)
*exceed = 1;
}
return result;
} else {
/*
* region is within kms and, hence, within real file
* size (A). We need to increase i_size to cover the
* read region so that generic_file_read() will do its
* job, but that doesn't mean the kms size is
* _correct_, it is only the _minimum_ size. If
* someone does a stat they will get the correct size
* which will always be >= the kms value here.
* b=11081
*/
if (cl_isize_read(inode) < kms) {
cl_isize_write_nolock(inode, kms);
CDEBUG(D_VFSTRACE,
DFID" updating i_size %llu\n",
PFID(lu_object_fid(&obj->co_lu)),
(__u64)cl_isize_read(inode));
}
}
}
ccc_object_size_unlock(obj);
return result;
}
/*****************************************************************************
*
* Transfer operations.
*
*/
void ccc_req_completion(const struct lu_env *env,
const struct cl_req_slice *slice, int ioret)
{
struct ccc_req *vrq;
if (ioret > 0)
cl_stats_tally(slice->crs_dev, slice->crs_req->crq_type, ioret);
vrq = cl2ccc_req(slice);
OBD_SLAB_FREE_PTR(vrq, ccc_req_kmem);
}
/**
* Implementation of struct cl_req_operations::cro_attr_set() for ccc
* layer. ccc is responsible for
*
* - o_[mac]time
*
* - o_mode
*
* - o_parent_seq
*
* - o_[ug]id
*
* - o_parent_oid
*
* - o_parent_ver
*
* - o_ioepoch,
*
* and capability.
*/
void ccc_req_attr_set(const struct lu_env *env,
const struct cl_req_slice *slice,
const struct cl_object *obj,
struct cl_req_attr *attr, u64 flags)
{
struct inode *inode;
struct obdo *oa;
u32 valid_flags;
oa = attr->cra_oa;
inode = ccc_object_inode(obj);
valid_flags = OBD_MD_FLTYPE;
if ((flags & OBD_MD_FLOSSCAPA) != 0) {
LASSERT(attr->cra_capa == NULL);
attr->cra_capa = cl_capa_lookup(inode,
slice->crs_req->crq_type);
}
if (slice->crs_req->crq_type == CRT_WRITE) {
if (flags & OBD_MD_FLEPOCH) {
oa->o_valid |= OBD_MD_FLEPOCH;
oa->o_ioepoch = cl_i2info(inode)->lli_ioepoch;
valid_flags |= OBD_MD_FLMTIME | OBD_MD_FLCTIME |
OBD_MD_FLUID | OBD_MD_FLGID;
}
}
obdo_from_inode(oa, inode, valid_flags & flags);
obdo_set_parent_fid(oa, &cl_i2info(inode)->lli_fid);
memcpy(attr->cra_jobid, cl_i2info(inode)->lli_jobid,
JOBSTATS_JOBID_SIZE);
}
static const struct cl_req_operations ccc_req_ops = {
.cro_attr_set = ccc_req_attr_set,
.cro_completion = ccc_req_completion
};
int cl_setattr_ost(struct inode *inode, const struct iattr *attr,
struct obd_capa *capa)
{
struct lu_env *env;
struct cl_io *io;
int result;
int refcheck;
env = cl_env_get(&refcheck);
if (IS_ERR(env))
return PTR_ERR(env);
io = ccc_env_thread_io(env);
io->ci_obj = cl_i2info(inode)->lli_clob;
io->u.ci_setattr.sa_attr.lvb_atime = LTIME_S(attr->ia_atime);
io->u.ci_setattr.sa_attr.lvb_mtime = LTIME_S(attr->ia_mtime);
io->u.ci_setattr.sa_attr.lvb_ctime = LTIME_S(attr->ia_ctime);
io->u.ci_setattr.sa_attr.lvb_size = attr->ia_size;
io->u.ci_setattr.sa_valid = attr->ia_valid;
io->u.ci_setattr.sa_capa = capa;
again:
if (cl_io_init(env, io, CIT_SETATTR, io->ci_obj) == 0) {
struct ccc_io *cio = ccc_env_io(env);
if (attr->ia_valid & ATTR_FILE)
/* populate the file descriptor for ftruncate to honor
* group lock - see LU-787 */
cio->cui_fd = cl_iattr2fd(inode, attr);
result = cl_io_loop(env, io);
} else {
result = io->ci_result;
}
cl_io_fini(env, io);
if (unlikely(io->ci_need_restart))
goto again;
/* HSM import case: file is released, cannot be restored
* no need to fail except if restore registration failed
* with -ENODATA */
if (result == -ENODATA && io->ci_restore_needed &&
io->ci_result != -ENODATA)
result = 0;
cl_env_put(env, &refcheck);
return result;
}
/*****************************************************************************
*
* Type conversions.
*
*/
struct lu_device *ccc2lu_dev(struct ccc_device *vdv)
{
return &vdv->cdv_cl.cd_lu_dev;
}
struct ccc_device *lu2ccc_dev(const struct lu_device *d)
{
return container_of0(d, struct ccc_device, cdv_cl.cd_lu_dev);
}
struct ccc_device *cl2ccc_dev(const struct cl_device *d)
{
return container_of0(d, struct ccc_device, cdv_cl);
}
struct lu_object *ccc2lu(struct ccc_object *vob)
{
return &vob->cob_cl.co_lu;
}
struct ccc_object *lu2ccc(const struct lu_object *obj)
{
return container_of0(obj, struct ccc_object, cob_cl.co_lu);
}
struct ccc_object *cl2ccc(const struct cl_object *obj)
{
return container_of0(obj, struct ccc_object, cob_cl);
}
struct ccc_lock *cl2ccc_lock(const struct cl_lock_slice *slice)
{
return container_of(slice, struct ccc_lock, clk_cl);
}
struct ccc_io *cl2ccc_io(const struct lu_env *env,
const struct cl_io_slice *slice)
{
struct ccc_io *cio;
cio = container_of(slice, struct ccc_io, cui_cl);
LASSERT(cio == ccc_env_io(env));
return cio;
}
struct ccc_req *cl2ccc_req(const struct cl_req_slice *slice)
{
return container_of0(slice, struct ccc_req, crq_cl);
}
struct page *cl2vm_page(const struct cl_page_slice *slice)
{
return cl2ccc_page(slice)->cpg_page;
}
/*****************************************************************************
*
* Accessors.
*
*/
int ccc_object_invariant(const struct cl_object *obj)
{
struct inode *inode = ccc_object_inode(obj);
struct cl_inode_info *lli = cl_i2info(inode);
return (S_ISREG(cl_inode_mode(inode)) ||
/* i_mode of unlinked inode is zeroed. */
cl_inode_mode(inode) == 0) && lli->lli_clob == obj;
}
struct inode *ccc_object_inode(const struct cl_object *obj)
{
return cl2ccc(obj)->cob_inode;
}
/**
* Returns a pointer to cl_page associated with \a vmpage, without acquiring
* additional reference to the resulting page. This is an unsafe version of
* cl_vmpage_page() that can only be used under vmpage lock.
*/
struct cl_page *ccc_vmpage_page_transient(struct page *vmpage)
{
KLASSERT(PageLocked(vmpage));
return (struct cl_page *)vmpage->private;
}
/**
* Initialize or update CLIO structures for regular files when new
* meta-data arrives from the server.
*
* \param inode regular file inode
* \param md new file metadata from MDS
* - allocates cl_object if necessary,
* - updated layout, if object was already here.
*/
int cl_file_inode_init(struct inode *inode, struct lustre_md *md)
{
struct lu_env *env;
struct cl_inode_info *lli;
struct cl_object *clob;
struct lu_site *site;
struct lu_fid *fid;
struct cl_object_conf conf = {
.coc_inode = inode,
.u = {
.coc_md = md
}
};
int result = 0;
int refcheck;
LASSERT(md->body->valid & OBD_MD_FLID);
LASSERT(S_ISREG(cl_inode_mode(inode)));
env = cl_env_get(&refcheck);
if (IS_ERR(env))
return PTR_ERR(env);
site = cl_i2sbi(inode)->ll_site;
lli = cl_i2info(inode);
fid = &lli->lli_fid;
LASSERT(fid_is_sane(fid));
if (lli->lli_clob == NULL) {
/* clob is slave of inode, empty lli_clob means for new inode,
* there is no clob in cache with the given fid, so it is
* unnecessary to perform lookup-alloc-lookup-insert, just
* alloc and insert directly. */
LASSERT(inode->i_state & I_NEW);
conf.coc_lu.loc_flags = LOC_F_NEW;
clob = cl_object_find(env, lu2cl_dev(site->ls_top_dev),
fid, &conf);
if (!IS_ERR(clob)) {
/*
* No locking is necessary, as new inode is
* locked by I_NEW bit.
*/
lli->lli_clob = clob;
lli->lli_has_smd = lsm_has_objects(md->lsm);
lu_object_ref_add(&clob->co_lu, "inode", inode);
} else
result = PTR_ERR(clob);
} else {
result = cl_conf_set(env, lli->lli_clob, &conf);
}
cl_env_put(env, &refcheck);
if (result != 0)
CERROR("Failure to initialize cl object "DFID": %d\n",
PFID(fid), result);
return result;
}
/**
* Wait for others drop their references of the object at first, then we drop
* the last one, which will lead to the object be destroyed immediately.
* Must be called after cl_object_kill() against this object.
*
* The reason we want to do this is: destroying top object will wait for sub
* objects being destroyed first, so we can't let bottom layer (e.g. from ASTs)
* to initiate top object destroying which may deadlock. See bz22520.
*/
static void cl_object_put_last(struct lu_env *env, struct cl_object *obj)
{
struct lu_object_header *header = obj->co_lu.lo_header;
wait_queue_t waiter;
if (unlikely(atomic_read(&header->loh_ref) != 1)) {
struct lu_site *site = obj->co_lu.lo_dev->ld_site;
struct lu_site_bkt_data *bkt;
bkt = lu_site_bkt_from_fid(site, &header->loh_fid);
init_waitqueue_entry(&waiter, current);
add_wait_queue(&bkt->lsb_marche_funebre, &waiter);
while (1) {
set_current_state(TASK_UNINTERRUPTIBLE);
if (atomic_read(&header->loh_ref) == 1)
break;
schedule();
}
set_current_state(TASK_RUNNING);
remove_wait_queue(&bkt->lsb_marche_funebre, &waiter);
}
cl_object_put(env, obj);
}
void cl_inode_fini(struct inode *inode)
{
struct lu_env *env;
struct cl_inode_info *lli = cl_i2info(inode);
struct cl_object *clob = lli->lli_clob;
int refcheck;
int emergency;
if (clob != NULL) {
void *cookie;
cookie = cl_env_reenter();
env = cl_env_get(&refcheck);
emergency = IS_ERR(env);
if (emergency) {
mutex_lock(&ccc_inode_fini_guard);
LASSERT(ccc_inode_fini_env != NULL);
cl_env_implant(ccc_inode_fini_env, &refcheck);
env = ccc_inode_fini_env;
}
/*
* cl_object cache is a slave to inode cache (which, in turn
* is a slave to dentry cache), don't keep cl_object in memory
* when its master is evicted.
*/
cl_object_kill(env, clob);
lu_object_ref_del(&clob->co_lu, "inode", inode);
cl_object_put_last(env, clob);
lli->lli_clob = NULL;
if (emergency) {
cl_env_unplant(ccc_inode_fini_env, &refcheck);
mutex_unlock(&ccc_inode_fini_guard);
} else
cl_env_put(env, &refcheck);
cl_env_reexit(cookie);
}
}
/**
* return IF_* type for given lu_dirent entry.
* IF_* flag shld be converted to particular OS file type in
* platform llite module.
*/
__u16 ll_dirent_type_get(struct lu_dirent *ent)
{
__u16 type = 0;
struct luda_type *lt;
int len = 0;
if (le32_to_cpu(ent->lde_attrs) & LUDA_TYPE) {
const unsigned align = sizeof(struct luda_type) - 1;
len = le16_to_cpu(ent->lde_namelen);
len = (len + align) & ~align;
lt = (void *)ent->lde_name + len;
type = IFTODT(le16_to_cpu(lt->lt_type));
}
return type;
}
/**
* build inode number from passed @fid */
__u64 cl_fid_build_ino(const struct lu_fid *fid, int api32)
{
if (BITS_PER_LONG == 32 || api32)
return fid_flatten32(fid);
else
return fid_flatten(fid);
}
/**
* build inode generation from passed @fid. If our FID overflows the 32-bit
* inode number then return a non-zero generation to distinguish them. */
__u32 cl_fid_build_gen(const struct lu_fid *fid)
{
__u32 gen;
if (fid_is_igif(fid)) {
gen = lu_igif_gen(fid);
return gen;
}
gen = (fid_flatten(fid) >> 32);
return gen;
}
/* lsm is unreliable after hsm implementation as layout can be changed at
* any time. This is only to support old, non-clio-ized interfaces. It will
* cause deadlock if clio operations are called with this extra layout refcount
* because in case the layout changed during the IO, ll_layout_refresh() will
* have to wait for the refcount to become zero to destroy the older layout.
*
* Notice that the lsm returned by this function may not be valid unless called
* inside layout lock - MDS_INODELOCK_LAYOUT. */
struct lov_stripe_md *ccc_inode_lsm_get(struct inode *inode)
{
return lov_lsm_get(cl_i2info(inode)->lli_clob);
}
inline void ccc_inode_lsm_put(struct inode *inode, struct lov_stripe_md *lsm)
{
lov_lsm_put(cl_i2info(inode)->lli_clob, lsm);
}
|