1/* 2 * GPL HEADER START 3 * 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 only, 8 * as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, but 11 * WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * General Public License version 2 for more details (a copy is included 14 * in the LICENSE file that accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License 17 * version 2 along with this program; If not, see 18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf 19 * 20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 21 * CA 95054 USA or visit www.sun.com if you need additional information or 22 * have any questions. 23 * 24 * GPL HEADER END 25 */ 26/* 27 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. 28 * Use is subject to license terms. 29 * 30 * Copyright (c) 2011, 2012, Intel Corporation. 31 */ 32/* 33 * This file is part of Lustre, http://www.lustre.org/ 34 * Lustre is a trademark of Sun Microsystems, Inc. 35 */ 36 37#define DEBUG_SUBSYSTEM S_MDC 38#include "../include/lustre_net.h" 39#include "../include/lustre/lustre_idl.h" 40#include "mdc_internal.h" 41 42 43static void __mdc_pack_body(struct mdt_body *b, __u32 suppgid) 44{ 45 LASSERT(b != NULL); 46 47 b->suppgid = suppgid; 48 b->uid = from_kuid(&init_user_ns, current_uid()); 49 b->gid = from_kgid(&init_user_ns, current_gid()); 50 b->fsuid = from_kuid(&init_user_ns, current_fsuid()); 51 b->fsgid = from_kgid(&init_user_ns, current_fsgid()); 52 b->capability = cfs_curproc_cap_pack(); 53} 54 55void mdc_pack_capa(struct ptlrpc_request *req, 56 const struct req_msg_field *field, 57 struct obd_capa *oc) 58{ 59 struct req_capsule *pill = &req->rq_pill; 60 struct lustre_capa *c; 61 62 if (oc == NULL) { 63 LASSERT(req_capsule_get_size(pill, field, RCL_CLIENT) == 0); 64 return; 65 } 66 67 c = req_capsule_client_get(pill, field); 68 LASSERT(c != NULL); 69 capa_cpy(c, oc); 70 DEBUG_CAPA(D_SEC, c, "pack"); 71} 72 73void mdc_is_subdir_pack(struct ptlrpc_request *req, const struct lu_fid *pfid, 74 const struct lu_fid *cfid, int flags) 75{ 76 struct mdt_body *b = req_capsule_client_get(&req->rq_pill, 77 &RMF_MDT_BODY); 78 79 if (pfid) { 80 b->fid1 = *pfid; 81 b->valid = OBD_MD_FLID; 82 } 83 if (cfid) 84 b->fid2 = *cfid; 85 b->flags = flags; 86} 87 88void mdc_swap_layouts_pack(struct ptlrpc_request *req, 89 struct md_op_data *op_data) 90{ 91 struct mdt_body *b = req_capsule_client_get(&req->rq_pill, 92 &RMF_MDT_BODY); 93 94 __mdc_pack_body(b, op_data->op_suppgids[0]); 95 b->fid1 = op_data->op_fid1; 96 b->fid2 = op_data->op_fid2; 97 b->valid |= OBD_MD_FLID; 98 99 mdc_pack_capa(req, &RMF_CAPA1, op_data->op_capa1); 100 mdc_pack_capa(req, &RMF_CAPA2, op_data->op_capa2); 101} 102 103void mdc_pack_body(struct ptlrpc_request *req, 104 const struct lu_fid *fid, struct obd_capa *oc, 105 __u64 valid, int ea_size, __u32 suppgid, int flags) 106{ 107 struct mdt_body *b = req_capsule_client_get(&req->rq_pill, 108 &RMF_MDT_BODY); 109 LASSERT(b != NULL); 110 b->valid = valid; 111 b->eadatasize = ea_size; 112 b->flags = flags; 113 __mdc_pack_body(b, suppgid); 114 if (fid) { 115 b->fid1 = *fid; 116 b->valid |= OBD_MD_FLID; 117 mdc_pack_capa(req, &RMF_CAPA1, oc); 118 } 119} 120 121void mdc_readdir_pack(struct ptlrpc_request *req, __u64 pgoff, 122 __u32 size, const struct lu_fid *fid, struct obd_capa *oc) 123{ 124 struct mdt_body *b = req_capsule_client_get(&req->rq_pill, 125 &RMF_MDT_BODY); 126 b->fid1 = *fid; 127 b->valid |= OBD_MD_FLID; 128 b->size = pgoff; /* !! */ 129 b->nlink = size; /* !! */ 130 __mdc_pack_body(b, -1); 131 b->mode = LUDA_FID | LUDA_TYPE; 132 133 mdc_pack_capa(req, &RMF_CAPA1, oc); 134} 135 136/* packing of MDS records */ 137void mdc_create_pack(struct ptlrpc_request *req, struct md_op_data *op_data, 138 const void *data, int datalen, __u32 mode, 139 __u32 uid, __u32 gid, cfs_cap_t cap_effective, __u64 rdev) 140{ 141 struct mdt_rec_create *rec; 142 char *tmp; 143 __u64 flags; 144 145 CLASSERT(sizeof(struct mdt_rec_reint) == sizeof(struct mdt_rec_create)); 146 rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT); 147 148 149 rec->cr_opcode = REINT_CREATE; 150 rec->cr_fsuid = uid; 151 rec->cr_fsgid = gid; 152 rec->cr_cap = cap_effective; 153 rec->cr_fid1 = op_data->op_fid1; 154 rec->cr_fid2 = op_data->op_fid2; 155 rec->cr_mode = mode; 156 rec->cr_rdev = rdev; 157 rec->cr_time = op_data->op_mod_time; 158 rec->cr_suppgid1 = op_data->op_suppgids[0]; 159 rec->cr_suppgid2 = op_data->op_suppgids[1]; 160 flags = op_data->op_flags & MF_SOM_LOCAL_FLAGS; 161 if (op_data->op_bias & MDS_CREATE_VOLATILE) 162 flags |= MDS_OPEN_VOLATILE; 163 set_mrc_cr_flags(rec, flags); 164 rec->cr_bias = op_data->op_bias; 165 rec->cr_umask = current_umask(); 166 167 mdc_pack_capa(req, &RMF_CAPA1, op_data->op_capa1); 168 169 tmp = req_capsule_client_get(&req->rq_pill, &RMF_NAME); 170 LOGL0(op_data->op_name, op_data->op_namelen, tmp); 171 172 if (data) { 173 tmp = req_capsule_client_get(&req->rq_pill, &RMF_EADATA); 174 memcpy(tmp, data, datalen); 175 } 176} 177 178static __u64 mds_pack_open_flags(__u64 flags, __u32 mode) 179{ 180 __u64 cr_flags = (flags & (FMODE_READ | FMODE_WRITE | 181 MDS_OPEN_HAS_EA | MDS_OPEN_HAS_OBJS | 182 MDS_OPEN_OWNEROVERRIDE | MDS_OPEN_LOCK | 183 MDS_OPEN_BY_FID | MDS_OPEN_LEASE | 184 MDS_OPEN_RELEASE)); 185 if (flags & O_CREAT) 186 cr_flags |= MDS_OPEN_CREAT; 187 if (flags & O_EXCL) 188 cr_flags |= MDS_OPEN_EXCL; 189 if (flags & O_TRUNC) 190 cr_flags |= MDS_OPEN_TRUNC; 191 if (flags & O_APPEND) 192 cr_flags |= MDS_OPEN_APPEND; 193 if (flags & O_SYNC) 194 cr_flags |= MDS_OPEN_SYNC; 195 if (flags & O_DIRECTORY) 196 cr_flags |= MDS_OPEN_DIRECTORY; 197#ifdef FMODE_EXEC 198 if (flags & FMODE_EXEC) 199 cr_flags |= MDS_FMODE_EXEC; 200#endif 201 if (cl_is_lov_delay_create(flags)) 202 cr_flags |= MDS_OPEN_DELAY_CREATE; 203 204 if (flags & O_NONBLOCK) 205 cr_flags |= MDS_OPEN_NORESTORE; 206 207 return cr_flags; 208} 209 210/* packing of MDS records */ 211void mdc_open_pack(struct ptlrpc_request *req, struct md_op_data *op_data, 212 __u32 mode, __u64 rdev, __u64 flags, const void *lmm, 213 int lmmlen) 214{ 215 struct mdt_rec_create *rec; 216 char *tmp; 217 __u64 cr_flags; 218 219 CLASSERT(sizeof(struct mdt_rec_reint) == sizeof(struct mdt_rec_create)); 220 rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT); 221 222 /* XXX do something about time, uid, gid */ 223 rec->cr_opcode = REINT_OPEN; 224 rec->cr_fsuid = from_kuid(&init_user_ns, current_fsuid()); 225 rec->cr_fsgid = from_kgid(&init_user_ns, current_fsgid()); 226 rec->cr_cap = cfs_curproc_cap_pack(); 227 if (op_data != NULL) { 228 rec->cr_fid1 = op_data->op_fid1; 229 rec->cr_fid2 = op_data->op_fid2; 230 } 231 rec->cr_mode = mode; 232 cr_flags = mds_pack_open_flags(flags, mode); 233 rec->cr_rdev = rdev; 234 rec->cr_time = op_data->op_mod_time; 235 rec->cr_suppgid1 = op_data->op_suppgids[0]; 236 rec->cr_suppgid2 = op_data->op_suppgids[1]; 237 rec->cr_bias = op_data->op_bias; 238 rec->cr_umask = current_umask(); 239 rec->cr_old_handle = op_data->op_handle; 240 241 mdc_pack_capa(req, &RMF_CAPA1, op_data->op_capa1); 242 /* the next buffer is child capa, which is used for replay, 243 * will be packed from the data in reply message. */ 244 245 if (op_data->op_name) { 246 tmp = req_capsule_client_get(&req->rq_pill, &RMF_NAME); 247 LOGL0(op_data->op_name, op_data->op_namelen, tmp); 248 if (op_data->op_bias & MDS_CREATE_VOLATILE) 249 cr_flags |= MDS_OPEN_VOLATILE; 250 } 251 252 if (lmm) { 253 cr_flags |= MDS_OPEN_HAS_EA; 254 tmp = req_capsule_client_get(&req->rq_pill, &RMF_EADATA); 255 memcpy(tmp, lmm, lmmlen); 256 } 257 set_mrc_cr_flags(rec, cr_flags); 258} 259 260static inline __u64 attr_pack(unsigned int ia_valid) 261{ 262 __u64 sa_valid = 0; 263 264 if (ia_valid & ATTR_MODE) 265 sa_valid |= MDS_ATTR_MODE; 266 if (ia_valid & ATTR_UID) 267 sa_valid |= MDS_ATTR_UID; 268 if (ia_valid & ATTR_GID) 269 sa_valid |= MDS_ATTR_GID; 270 if (ia_valid & ATTR_SIZE) 271 sa_valid |= MDS_ATTR_SIZE; 272 if (ia_valid & ATTR_ATIME) 273 sa_valid |= MDS_ATTR_ATIME; 274 if (ia_valid & ATTR_MTIME) 275 sa_valid |= MDS_ATTR_MTIME; 276 if (ia_valid & ATTR_CTIME) 277 sa_valid |= MDS_ATTR_CTIME; 278 if (ia_valid & ATTR_ATIME_SET) 279 sa_valid |= MDS_ATTR_ATIME_SET; 280 if (ia_valid & ATTR_MTIME_SET) 281 sa_valid |= MDS_ATTR_MTIME_SET; 282 if (ia_valid & ATTR_FORCE) 283 sa_valid |= MDS_ATTR_FORCE; 284 if (ia_valid & ATTR_ATTR_FLAG) 285 sa_valid |= MDS_ATTR_ATTR_FLAG; 286 if (ia_valid & ATTR_KILL_SUID) 287 sa_valid |= MDS_ATTR_KILL_SUID; 288 if (ia_valid & ATTR_KILL_SGID) 289 sa_valid |= MDS_ATTR_KILL_SGID; 290 if (ia_valid & ATTR_CTIME_SET) 291 sa_valid |= MDS_ATTR_CTIME_SET; 292 if (ia_valid & ATTR_FROM_OPEN) 293 sa_valid |= MDS_ATTR_FROM_OPEN; 294 if (ia_valid & ATTR_BLOCKS) 295 sa_valid |= MDS_ATTR_BLOCKS; 296 if (ia_valid & MDS_OPEN_OWNEROVERRIDE) 297 /* NFSD hack (see bug 5781) */ 298 sa_valid |= MDS_OPEN_OWNEROVERRIDE; 299 return sa_valid; 300} 301 302static void mdc_setattr_pack_rec(struct mdt_rec_setattr *rec, 303 struct md_op_data *op_data) 304{ 305 rec->sa_opcode = REINT_SETATTR; 306 rec->sa_fsuid = from_kuid(&init_user_ns, current_fsuid()); 307 rec->sa_fsgid = from_kgid(&init_user_ns, current_fsgid()); 308 rec->sa_cap = cfs_curproc_cap_pack(); 309 rec->sa_suppgid = -1; 310 311 rec->sa_fid = op_data->op_fid1; 312 rec->sa_valid = attr_pack(op_data->op_attr.ia_valid); 313 rec->sa_mode = op_data->op_attr.ia_mode; 314 rec->sa_uid = from_kuid(&init_user_ns, op_data->op_attr.ia_uid); 315 rec->sa_gid = from_kgid(&init_user_ns, op_data->op_attr.ia_gid); 316 rec->sa_size = op_data->op_attr.ia_size; 317 rec->sa_blocks = op_data->op_attr_blocks; 318 rec->sa_atime = LTIME_S(op_data->op_attr.ia_atime); 319 rec->sa_mtime = LTIME_S(op_data->op_attr.ia_mtime); 320 rec->sa_ctime = LTIME_S(op_data->op_attr.ia_ctime); 321 rec->sa_attr_flags = 322 ((struct ll_iattr *)&op_data->op_attr)->ia_attr_flags; 323 if ((op_data->op_attr.ia_valid & ATTR_GID) && 324 in_group_p(op_data->op_attr.ia_gid)) 325 rec->sa_suppgid = 326 from_kgid(&init_user_ns, op_data->op_attr.ia_gid); 327 else 328 rec->sa_suppgid = op_data->op_suppgids[0]; 329 330 rec->sa_bias = op_data->op_bias; 331} 332 333static void mdc_ioepoch_pack(struct mdt_ioepoch *epoch, 334 struct md_op_data *op_data) 335{ 336 memcpy(&epoch->handle, &op_data->op_handle, sizeof(epoch->handle)); 337 epoch->ioepoch = op_data->op_ioepoch; 338 epoch->flags = op_data->op_flags & MF_SOM_LOCAL_FLAGS; 339} 340 341void mdc_setattr_pack(struct ptlrpc_request *req, struct md_op_data *op_data, 342 void *ea, int ealen, void *ea2, int ea2len) 343{ 344 struct mdt_rec_setattr *rec; 345 struct mdt_ioepoch *epoch; 346 struct lov_user_md *lum = NULL; 347 348 CLASSERT(sizeof(struct mdt_rec_reint) == 349 sizeof(struct mdt_rec_setattr)); 350 rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT); 351 mdc_setattr_pack_rec(rec, op_data); 352 353 mdc_pack_capa(req, &RMF_CAPA1, op_data->op_capa1); 354 355 if (op_data->op_flags & (MF_SOM_CHANGE | MF_EPOCH_OPEN)) { 356 epoch = req_capsule_client_get(&req->rq_pill, &RMF_MDT_EPOCH); 357 mdc_ioepoch_pack(epoch, op_data); 358 } 359 360 if (ealen == 0) 361 return; 362 363 lum = req_capsule_client_get(&req->rq_pill, &RMF_EADATA); 364 if (ea == NULL) { /* Remove LOV EA */ 365 lum->lmm_magic = LOV_USER_MAGIC_V1; 366 lum->lmm_stripe_size = 0; 367 lum->lmm_stripe_count = 0; 368 lum->lmm_stripe_offset = (typeof(lum->lmm_stripe_offset))(-1); 369 } else { 370 memcpy(lum, ea, ealen); 371 } 372 373 if (ea2len == 0) 374 return; 375 376 memcpy(req_capsule_client_get(&req->rq_pill, &RMF_LOGCOOKIES), ea2, 377 ea2len); 378} 379 380void mdc_unlink_pack(struct ptlrpc_request *req, struct md_op_data *op_data) 381{ 382 struct mdt_rec_unlink *rec; 383 char *tmp; 384 385 CLASSERT(sizeof(struct mdt_rec_reint) == sizeof(struct mdt_rec_unlink)); 386 rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT); 387 LASSERT(rec != NULL); 388 389 rec->ul_opcode = op_data->op_cli_flags & CLI_RM_ENTRY ? 390 REINT_RMENTRY : REINT_UNLINK; 391 rec->ul_fsuid = op_data->op_fsuid; 392 rec->ul_fsgid = op_data->op_fsgid; 393 rec->ul_cap = op_data->op_cap; 394 rec->ul_mode = op_data->op_mode; 395 rec->ul_suppgid1 = op_data->op_suppgids[0]; 396 rec->ul_suppgid2 = -1; 397 rec->ul_fid1 = op_data->op_fid1; 398 rec->ul_fid2 = op_data->op_fid2; 399 rec->ul_time = op_data->op_mod_time; 400 rec->ul_bias = op_data->op_bias; 401 402 mdc_pack_capa(req, &RMF_CAPA1, op_data->op_capa1); 403 404 tmp = req_capsule_client_get(&req->rq_pill, &RMF_NAME); 405 LASSERT(tmp != NULL); 406 LOGL0(op_data->op_name, op_data->op_namelen, tmp); 407} 408 409void mdc_link_pack(struct ptlrpc_request *req, struct md_op_data *op_data) 410{ 411 struct mdt_rec_link *rec; 412 char *tmp; 413 414 CLASSERT(sizeof(struct mdt_rec_reint) == sizeof(struct mdt_rec_link)); 415 rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT); 416 LASSERT(rec != NULL); 417 418 rec->lk_opcode = REINT_LINK; 419 rec->lk_fsuid = op_data->op_fsuid; /* current->fsuid; */ 420 rec->lk_fsgid = op_data->op_fsgid; /* current->fsgid; */ 421 rec->lk_cap = op_data->op_cap; /* current->cap_effective; */ 422 rec->lk_suppgid1 = op_data->op_suppgids[0]; 423 rec->lk_suppgid2 = op_data->op_suppgids[1]; 424 rec->lk_fid1 = op_data->op_fid1; 425 rec->lk_fid2 = op_data->op_fid2; 426 rec->lk_time = op_data->op_mod_time; 427 rec->lk_bias = op_data->op_bias; 428 429 mdc_pack_capa(req, &RMF_CAPA1, op_data->op_capa1); 430 mdc_pack_capa(req, &RMF_CAPA2, op_data->op_capa2); 431 432 tmp = req_capsule_client_get(&req->rq_pill, &RMF_NAME); 433 LOGL0(op_data->op_name, op_data->op_namelen, tmp); 434} 435 436void mdc_rename_pack(struct ptlrpc_request *req, struct md_op_data *op_data, 437 const char *old, int oldlen, const char *new, int newlen) 438{ 439 struct mdt_rec_rename *rec; 440 char *tmp; 441 442 CLASSERT(sizeof(struct mdt_rec_reint) == sizeof(struct mdt_rec_rename)); 443 rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT); 444 445 /* XXX do something about time, uid, gid */ 446 rec->rn_opcode = REINT_RENAME; 447 rec->rn_fsuid = op_data->op_fsuid; 448 rec->rn_fsgid = op_data->op_fsgid; 449 rec->rn_cap = op_data->op_cap; 450 rec->rn_suppgid1 = op_data->op_suppgids[0]; 451 rec->rn_suppgid2 = op_data->op_suppgids[1]; 452 rec->rn_fid1 = op_data->op_fid1; 453 rec->rn_fid2 = op_data->op_fid2; 454 rec->rn_time = op_data->op_mod_time; 455 rec->rn_mode = op_data->op_mode; 456 rec->rn_bias = op_data->op_bias; 457 458 mdc_pack_capa(req, &RMF_CAPA1, op_data->op_capa1); 459 mdc_pack_capa(req, &RMF_CAPA2, op_data->op_capa2); 460 461 tmp = req_capsule_client_get(&req->rq_pill, &RMF_NAME); 462 LOGL0(old, oldlen, tmp); 463 464 if (new) { 465 tmp = req_capsule_client_get(&req->rq_pill, &RMF_SYMTGT); 466 LOGL0(new, newlen, tmp); 467 } 468} 469 470void mdc_getattr_pack(struct ptlrpc_request *req, __u64 valid, int flags, 471 struct md_op_data *op_data, int ea_size) 472{ 473 struct mdt_body *b = req_capsule_client_get(&req->rq_pill, 474 &RMF_MDT_BODY); 475 476 b->valid = valid; 477 if (op_data->op_bias & MDS_CHECK_SPLIT) 478 b->valid |= OBD_MD_FLCKSPLIT; 479 if (op_data->op_bias & MDS_CROSS_REF) 480 b->valid |= OBD_MD_FLCROSSREF; 481 b->eadatasize = ea_size; 482 b->flags = flags; 483 __mdc_pack_body(b, op_data->op_suppgids[0]); 484 485 b->fid1 = op_data->op_fid1; 486 b->fid2 = op_data->op_fid2; 487 b->valid |= OBD_MD_FLID; 488 489 mdc_pack_capa(req, &RMF_CAPA1, op_data->op_capa1); 490 491 if (op_data->op_name) { 492 char *tmp = req_capsule_client_get(&req->rq_pill, &RMF_NAME); 493 494 LOGL0(op_data->op_name, op_data->op_namelen, tmp); 495 496 } 497} 498 499static void mdc_hsm_release_pack(struct ptlrpc_request *req, 500 struct md_op_data *op_data) 501{ 502 if (op_data->op_bias & MDS_HSM_RELEASE) { 503 struct close_data *data; 504 struct ldlm_lock *lock; 505 506 data = req_capsule_client_get(&req->rq_pill, &RMF_CLOSE_DATA); 507 LASSERT(data != NULL); 508 509 lock = ldlm_handle2lock(&op_data->op_lease_handle); 510 if (lock != NULL) { 511 data->cd_handle = lock->l_remote_handle; 512 ldlm_lock_put(lock); 513 } 514 ldlm_cli_cancel(&op_data->op_lease_handle, LCF_LOCAL); 515 516 data->cd_data_version = op_data->op_data_version; 517 data->cd_fid = op_data->op_fid2; 518 } 519} 520 521void mdc_close_pack(struct ptlrpc_request *req, struct md_op_data *op_data) 522{ 523 struct mdt_ioepoch *epoch; 524 struct mdt_rec_setattr *rec; 525 526 epoch = req_capsule_client_get(&req->rq_pill, &RMF_MDT_EPOCH); 527 rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT); 528 529 mdc_setattr_pack_rec(rec, op_data); 530 mdc_pack_capa(req, &RMF_CAPA1, op_data->op_capa1); 531 mdc_ioepoch_pack(epoch, op_data); 532 mdc_hsm_release_pack(req, op_data); 533} 534 535static int mdc_req_avail(struct client_obd *cli, struct mdc_cache_waiter *mcw) 536{ 537 int rc; 538 539 client_obd_list_lock(&cli->cl_loi_list_lock); 540 rc = list_empty(&mcw->mcw_entry); 541 client_obd_list_unlock(&cli->cl_loi_list_lock); 542 return rc; 543}; 544 545/* We record requests in flight in cli->cl_r_in_flight here. 546 * There is only one write rpc possible in mdc anyway. If this to change 547 * in the future - the code may need to be revisited. */ 548int mdc_enter_request(struct client_obd *cli) 549{ 550 int rc = 0; 551 struct mdc_cache_waiter mcw; 552 struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL); 553 554 client_obd_list_lock(&cli->cl_loi_list_lock); 555 if (cli->cl_r_in_flight >= cli->cl_max_rpcs_in_flight) { 556 list_add_tail(&mcw.mcw_entry, &cli->cl_cache_waiters); 557 init_waitqueue_head(&mcw.mcw_waitq); 558 client_obd_list_unlock(&cli->cl_loi_list_lock); 559 rc = l_wait_event(mcw.mcw_waitq, mdc_req_avail(cli, &mcw), 560 &lwi); 561 if (rc) { 562 client_obd_list_lock(&cli->cl_loi_list_lock); 563 if (list_empty(&mcw.mcw_entry)) 564 cli->cl_r_in_flight--; 565 list_del_init(&mcw.mcw_entry); 566 client_obd_list_unlock(&cli->cl_loi_list_lock); 567 } 568 } else { 569 cli->cl_r_in_flight++; 570 client_obd_list_unlock(&cli->cl_loi_list_lock); 571 } 572 return rc; 573} 574 575void mdc_exit_request(struct client_obd *cli) 576{ 577 struct list_head *l, *tmp; 578 struct mdc_cache_waiter *mcw; 579 580 client_obd_list_lock(&cli->cl_loi_list_lock); 581 cli->cl_r_in_flight--; 582 list_for_each_safe(l, tmp, &cli->cl_cache_waiters) { 583 if (cli->cl_r_in_flight >= cli->cl_max_rpcs_in_flight) { 584 /* No free request slots anymore */ 585 break; 586 } 587 588 mcw = list_entry(l, struct mdc_cache_waiter, mcw_entry); 589 list_del_init(&mcw->mcw_entry); 590 cli->cl_r_in_flight++; 591 wake_up(&mcw->mcw_waitq); 592 } 593 /* Empty waiting list? Decrease reqs in-flight number */ 594 595 client_obd_list_unlock(&cli->cl_loi_list_lock); 596} 597