1 /* 2 * Module for the pnfs nfs4 file layout driver. 3 * Defines all I/O and Policy interface operations, plus code 4 * to register itself with the pNFS client. 5 * 6 * Copyright (c) 2002 7 * The Regents of the University of Michigan 8 * All Rights Reserved 9 * 10 * Dean Hildebrand <dhildebz@umich.edu> 11 * 12 * Permission is granted to use, copy, create derivative works, and 13 * redistribute this software and such derivative works for any purpose, 14 * so long as the name of the University of Michigan is not used in 15 * any advertising or publicity pertaining to the use or distribution 16 * of this software without specific, written prior authorization. If 17 * the above copyright notice or any other identification of the 18 * University of Michigan is included in any copy of any portion of 19 * this software, then the disclaimer below must also be included. 20 * 21 * This software is provided as is, without representation or warranty 22 * of any kind either express or implied, including without limitation 23 * the implied warranties of merchantability, fitness for a particular 24 * purpose, or noninfringement. The Regents of the University of 25 * Michigan shall not be liable for any damages, including special, 26 * indirect, incidental, or consequential damages, with respect to any 27 * claim arising out of or in connection with the use of the software, 28 * even if it has been or is hereafter advised of the possibility of 29 * such damages. 30 */ 31 32 #include <linux/nfs_fs.h> 33 #include <linux/nfs_page.h> 34 #include <linux/module.h> 35 36 #include <linux/sunrpc/metrics.h> 37 38 #include "../nfs4session.h" 39 #include "../internal.h" 40 #include "../delegation.h" 41 #include "filelayout.h" 42 #include "../nfs4trace.h" 43 44 #define NFSDBG_FACILITY NFSDBG_PNFS_LD 45 46 MODULE_LICENSE("GPL"); 47 MODULE_AUTHOR("Dean Hildebrand <dhildebz@umich.edu>"); 48 MODULE_DESCRIPTION("The NFSv4 file layout driver"); 49 50 #define FILELAYOUT_POLL_RETRY_MAX (15*HZ) 51 52 static loff_t 53 filelayout_get_dense_offset(struct nfs4_filelayout_segment *flseg, 54 loff_t offset) 55 { 56 u32 stripe_width = flseg->stripe_unit * flseg->dsaddr->stripe_count; 57 u64 stripe_no; 58 u32 rem; 59 60 offset -= flseg->pattern_offset; 61 stripe_no = div_u64(offset, stripe_width); 62 div_u64_rem(offset, flseg->stripe_unit, &rem); 63 64 return stripe_no * flseg->stripe_unit + rem; 65 } 66 67 /* This function is used by the layout driver to calculate the 68 * offset of the file on the dserver based on whether the 69 * layout type is STRIPE_DENSE or STRIPE_SPARSE 70 */ 71 static loff_t 72 filelayout_get_dserver_offset(struct pnfs_layout_segment *lseg, loff_t offset) 73 { 74 struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); 75 76 switch (flseg->stripe_type) { 77 case STRIPE_SPARSE: 78 return offset; 79 80 case STRIPE_DENSE: 81 return filelayout_get_dense_offset(flseg, offset); 82 } 83 84 BUG(); 85 } 86 87 static void filelayout_reset_write(struct nfs_pgio_header *hdr) 88 { 89 struct rpc_task *task = &hdr->task; 90 91 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 92 dprintk("%s Reset task %5u for i/o through MDS " 93 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 94 hdr->task.tk_pid, 95 hdr->inode->i_sb->s_id, 96 (unsigned long long)NFS_FILEID(hdr->inode), 97 hdr->args.count, 98 (unsigned long long)hdr->args.offset); 99 100 task->tk_status = pnfs_write_done_resend_to_mds(hdr); 101 } 102 } 103 104 static void filelayout_reset_read(struct nfs_pgio_header *hdr) 105 { 106 struct rpc_task *task = &hdr->task; 107 108 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 109 dprintk("%s Reset task %5u for i/o through MDS " 110 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 111 hdr->task.tk_pid, 112 hdr->inode->i_sb->s_id, 113 (unsigned long long)NFS_FILEID(hdr->inode), 114 hdr->args.count, 115 (unsigned long long)hdr->args.offset); 116 117 task->tk_status = pnfs_read_done_resend_to_mds(hdr); 118 } 119 } 120 121 static void filelayout_fenceme(struct inode *inode, struct pnfs_layout_hdr *lo) 122 { 123 if (!test_and_clear_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) 124 return; 125 pnfs_return_layout(inode); 126 } 127 128 static int filelayout_async_handle_error(struct rpc_task *task, 129 struct nfs4_state *state, 130 struct nfs_client *clp, 131 struct pnfs_layout_segment *lseg) 132 { 133 struct pnfs_layout_hdr *lo = lseg->pls_layout; 134 struct inode *inode = lo->plh_inode; 135 struct nfs_server *mds_server = NFS_SERVER(inode); 136 struct nfs4_deviceid_node *devid = FILELAYOUT_DEVID_NODE(lseg); 137 struct nfs_client *mds_client = mds_server->nfs_client; 138 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table; 139 140 if (task->tk_status >= 0) 141 return 0; 142 143 switch (task->tk_status) { 144 /* MDS state errors */ 145 case -NFS4ERR_DELEG_REVOKED: 146 case -NFS4ERR_ADMIN_REVOKED: 147 case -NFS4ERR_BAD_STATEID: 148 case -NFS4ERR_OPENMODE: 149 if (state == NULL) 150 break; 151 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0) 152 goto out_bad_stateid; 153 goto wait_on_recovery; 154 case -NFS4ERR_EXPIRED: 155 if (state != NULL) { 156 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0) 157 goto out_bad_stateid; 158 } 159 nfs4_schedule_lease_recovery(mds_client); 160 goto wait_on_recovery; 161 /* DS session errors */ 162 case -NFS4ERR_BADSESSION: 163 case -NFS4ERR_BADSLOT: 164 case -NFS4ERR_BAD_HIGH_SLOT: 165 case -NFS4ERR_DEADSESSION: 166 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 167 case -NFS4ERR_SEQ_FALSE_RETRY: 168 case -NFS4ERR_SEQ_MISORDERED: 169 dprintk("%s ERROR %d, Reset session. Exchangeid " 170 "flags 0x%x\n", __func__, task->tk_status, 171 clp->cl_exchange_flags); 172 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status); 173 break; 174 case -NFS4ERR_DELAY: 175 case -NFS4ERR_GRACE: 176 rpc_delay(task, FILELAYOUT_POLL_RETRY_MAX); 177 break; 178 case -NFS4ERR_RETRY_UNCACHED_REP: 179 break; 180 /* Invalidate Layout errors */ 181 case -NFS4ERR_PNFS_NO_LAYOUT: 182 case -ESTALE: /* mapped NFS4ERR_STALE */ 183 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */ 184 case -EISDIR: /* mapped NFS4ERR_ISDIR */ 185 case -NFS4ERR_FHEXPIRED: 186 case -NFS4ERR_WRONG_TYPE: 187 dprintk("%s Invalid layout error %d\n", __func__, 188 task->tk_status); 189 /* 190 * Destroy layout so new i/o will get a new layout. 191 * Layout will not be destroyed until all current lseg 192 * references are put. Mark layout as invalid to resend failed 193 * i/o and all i/o waiting on the slot table to the MDS until 194 * layout is destroyed and a new valid layout is obtained. 195 */ 196 pnfs_destroy_layout(NFS_I(inode)); 197 rpc_wake_up(&tbl->slot_tbl_waitq); 198 goto reset; 199 /* RPC connection errors */ 200 case -ECONNREFUSED: 201 case -EHOSTDOWN: 202 case -EHOSTUNREACH: 203 case -ENETUNREACH: 204 case -EIO: 205 case -ETIMEDOUT: 206 case -EPIPE: 207 dprintk("%s DS connection error %d\n", __func__, 208 task->tk_status); 209 nfs4_mark_deviceid_unavailable(devid); 210 set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags); 211 rpc_wake_up(&tbl->slot_tbl_waitq); 212 /* fall through */ 213 default: 214 reset: 215 dprintk("%s Retry through MDS. Error %d\n", __func__, 216 task->tk_status); 217 return -NFS4ERR_RESET_TO_MDS; 218 } 219 out: 220 task->tk_status = 0; 221 return -EAGAIN; 222 out_bad_stateid: 223 task->tk_status = -EIO; 224 return 0; 225 wait_on_recovery: 226 rpc_sleep_on(&mds_client->cl_rpcwaitq, task, NULL); 227 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &mds_client->cl_state) == 0) 228 rpc_wake_up_queued_task(&mds_client->cl_rpcwaitq, task); 229 goto out; 230 } 231 232 /* NFS_PROTO call done callback routines */ 233 234 static int filelayout_read_done_cb(struct rpc_task *task, 235 struct nfs_pgio_header *hdr) 236 { 237 int err; 238 239 trace_nfs4_pnfs_read(hdr, task->tk_status); 240 err = filelayout_async_handle_error(task, hdr->args.context->state, 241 hdr->ds_clp, hdr->lseg); 242 243 switch (err) { 244 case -NFS4ERR_RESET_TO_MDS: 245 filelayout_reset_read(hdr); 246 return task->tk_status; 247 case -EAGAIN: 248 rpc_restart_call_prepare(task); 249 return -EAGAIN; 250 } 251 252 return 0; 253 } 254 255 /* 256 * We reference the rpc_cred of the first WRITE that triggers the need for 257 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound. 258 * rfc5661 is not clear about which credential should be used. 259 */ 260 static void 261 filelayout_set_layoutcommit(struct nfs_pgio_header *hdr) 262 { 263 264 if (FILELAYOUT_LSEG(hdr->lseg)->commit_through_mds || 265 hdr->res.verf->committed != NFS_DATA_SYNC) 266 return; 267 268 pnfs_set_layoutcommit(hdr); 269 dprintk("%s inode %lu pls_end_pos %lu\n", __func__, hdr->inode->i_ino, 270 (unsigned long) NFS_I(hdr->inode)->layout->plh_lwb); 271 } 272 273 bool 274 filelayout_test_devid_unavailable(struct nfs4_deviceid_node *node) 275 { 276 return filelayout_test_devid_invalid(node) || 277 nfs4_test_deviceid_unavailable(node); 278 } 279 280 static bool 281 filelayout_reset_to_mds(struct pnfs_layout_segment *lseg) 282 { 283 struct nfs4_deviceid_node *node = FILELAYOUT_DEVID_NODE(lseg); 284 285 return filelayout_test_devid_unavailable(node); 286 } 287 288 /* 289 * Call ops for the async read/write cases 290 * In the case of dense layouts, the offset needs to be reset to its 291 * original value. 292 */ 293 static void filelayout_read_prepare(struct rpc_task *task, void *data) 294 { 295 struct nfs_pgio_header *hdr = data; 296 297 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 298 rpc_exit(task, -EIO); 299 return; 300 } 301 if (filelayout_reset_to_mds(hdr->lseg)) { 302 dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid); 303 filelayout_reset_read(hdr); 304 rpc_exit(task, 0); 305 return; 306 } 307 hdr->pgio_done_cb = filelayout_read_done_cb; 308 309 if (nfs41_setup_sequence(hdr->ds_clp->cl_session, 310 &hdr->args.seq_args, 311 &hdr->res.seq_res, 312 task)) 313 return; 314 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 315 hdr->args.lock_context, FMODE_READ) == -EIO) 316 rpc_exit(task, -EIO); /* lost lock, terminate I/O */ 317 } 318 319 static void filelayout_read_call_done(struct rpc_task *task, void *data) 320 { 321 struct nfs_pgio_header *hdr = data; 322 323 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status); 324 325 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 326 task->tk_status == 0) { 327 nfs41_sequence_done(task, &hdr->res.seq_res); 328 return; 329 } 330 331 /* Note this may cause RPC to be resent */ 332 hdr->mds_ops->rpc_call_done(task, data); 333 } 334 335 static void filelayout_read_count_stats(struct rpc_task *task, void *data) 336 { 337 struct nfs_pgio_header *hdr = data; 338 339 rpc_count_iostats(task, NFS_SERVER(hdr->inode)->client->cl_metrics); 340 } 341 342 static void filelayout_read_release(void *data) 343 { 344 struct nfs_pgio_header *hdr = data; 345 struct pnfs_layout_hdr *lo = hdr->lseg->pls_layout; 346 347 filelayout_fenceme(lo->plh_inode, lo); 348 nfs_put_client(hdr->ds_clp); 349 hdr->mds_ops->rpc_release(data); 350 } 351 352 static int filelayout_write_done_cb(struct rpc_task *task, 353 struct nfs_pgio_header *hdr) 354 { 355 int err; 356 357 trace_nfs4_pnfs_write(hdr, task->tk_status); 358 err = filelayout_async_handle_error(task, hdr->args.context->state, 359 hdr->ds_clp, hdr->lseg); 360 361 switch (err) { 362 case -NFS4ERR_RESET_TO_MDS: 363 filelayout_reset_write(hdr); 364 return task->tk_status; 365 case -EAGAIN: 366 rpc_restart_call_prepare(task); 367 return -EAGAIN; 368 } 369 370 filelayout_set_layoutcommit(hdr); 371 return 0; 372 } 373 374 /* Fake up some data that will cause nfs_commit_release to retry the writes. */ 375 static void prepare_to_resend_writes(struct nfs_commit_data *data) 376 { 377 struct nfs_page *first = nfs_list_entry(data->pages.next); 378 379 data->task.tk_status = 0; 380 memcpy(&data->verf.verifier, &first->wb_verf, 381 sizeof(data->verf.verifier)); 382 data->verf.verifier.data[0]++; /* ensure verifier mismatch */ 383 } 384 385 static int filelayout_commit_done_cb(struct rpc_task *task, 386 struct nfs_commit_data *data) 387 { 388 int err; 389 390 trace_nfs4_pnfs_commit_ds(data, task->tk_status); 391 err = filelayout_async_handle_error(task, NULL, data->ds_clp, 392 data->lseg); 393 394 switch (err) { 395 case -NFS4ERR_RESET_TO_MDS: 396 prepare_to_resend_writes(data); 397 return -EAGAIN; 398 case -EAGAIN: 399 rpc_restart_call_prepare(task); 400 return -EAGAIN; 401 } 402 403 if (data->verf.committed == NFS_UNSTABLE) 404 pnfs_commit_set_layoutcommit(data); 405 406 return 0; 407 } 408 409 static void filelayout_write_prepare(struct rpc_task *task, void *data) 410 { 411 struct nfs_pgio_header *hdr = data; 412 413 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 414 rpc_exit(task, -EIO); 415 return; 416 } 417 if (filelayout_reset_to_mds(hdr->lseg)) { 418 dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid); 419 filelayout_reset_write(hdr); 420 rpc_exit(task, 0); 421 return; 422 } 423 if (nfs41_setup_sequence(hdr->ds_clp->cl_session, 424 &hdr->args.seq_args, 425 &hdr->res.seq_res, 426 task)) 427 return; 428 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 429 hdr->args.lock_context, FMODE_WRITE) == -EIO) 430 rpc_exit(task, -EIO); /* lost lock, terminate I/O */ 431 } 432 433 static void filelayout_write_call_done(struct rpc_task *task, void *data) 434 { 435 struct nfs_pgio_header *hdr = data; 436 437 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 438 task->tk_status == 0) { 439 nfs41_sequence_done(task, &hdr->res.seq_res); 440 return; 441 } 442 443 /* Note this may cause RPC to be resent */ 444 hdr->mds_ops->rpc_call_done(task, data); 445 } 446 447 static void filelayout_write_count_stats(struct rpc_task *task, void *data) 448 { 449 struct nfs_pgio_header *hdr = data; 450 451 rpc_count_iostats(task, NFS_SERVER(hdr->inode)->client->cl_metrics); 452 } 453 454 static void filelayout_write_release(void *data) 455 { 456 struct nfs_pgio_header *hdr = data; 457 struct pnfs_layout_hdr *lo = hdr->lseg->pls_layout; 458 459 filelayout_fenceme(lo->plh_inode, lo); 460 nfs_put_client(hdr->ds_clp); 461 hdr->mds_ops->rpc_release(data); 462 } 463 464 static void filelayout_commit_prepare(struct rpc_task *task, void *data) 465 { 466 struct nfs_commit_data *wdata = data; 467 468 nfs41_setup_sequence(wdata->ds_clp->cl_session, 469 &wdata->args.seq_args, 470 &wdata->res.seq_res, 471 task); 472 } 473 474 static void filelayout_write_commit_done(struct rpc_task *task, void *data) 475 { 476 struct nfs_commit_data *wdata = data; 477 478 /* Note this may cause RPC to be resent */ 479 wdata->mds_ops->rpc_call_done(task, data); 480 } 481 482 static void filelayout_commit_count_stats(struct rpc_task *task, void *data) 483 { 484 struct nfs_commit_data *cdata = data; 485 486 rpc_count_iostats(task, NFS_SERVER(cdata->inode)->client->cl_metrics); 487 } 488 489 static void filelayout_commit_release(void *calldata) 490 { 491 struct nfs_commit_data *data = calldata; 492 493 data->completion_ops->completion(data); 494 pnfs_put_lseg(data->lseg); 495 nfs_put_client(data->ds_clp); 496 nfs_commitdata_release(data); 497 } 498 499 static const struct rpc_call_ops filelayout_read_call_ops = { 500 .rpc_call_prepare = filelayout_read_prepare, 501 .rpc_call_done = filelayout_read_call_done, 502 .rpc_count_stats = filelayout_read_count_stats, 503 .rpc_release = filelayout_read_release, 504 }; 505 506 static const struct rpc_call_ops filelayout_write_call_ops = { 507 .rpc_call_prepare = filelayout_write_prepare, 508 .rpc_call_done = filelayout_write_call_done, 509 .rpc_count_stats = filelayout_write_count_stats, 510 .rpc_release = filelayout_write_release, 511 }; 512 513 static const struct rpc_call_ops filelayout_commit_call_ops = { 514 .rpc_call_prepare = filelayout_commit_prepare, 515 .rpc_call_done = filelayout_write_commit_done, 516 .rpc_count_stats = filelayout_commit_count_stats, 517 .rpc_release = filelayout_commit_release, 518 }; 519 520 static enum pnfs_try_status 521 filelayout_read_pagelist(struct nfs_pgio_header *hdr) 522 { 523 struct pnfs_layout_segment *lseg = hdr->lseg; 524 struct nfs4_pnfs_ds *ds; 525 struct rpc_clnt *ds_clnt; 526 loff_t offset = hdr->args.offset; 527 u32 j, idx; 528 struct nfs_fh *fh; 529 530 dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n", 531 __func__, hdr->inode->i_ino, 532 hdr->args.pgbase, (size_t)hdr->args.count, offset); 533 534 /* Retrieve the correct rpc_client for the byte range */ 535 j = nfs4_fl_calc_j_index(lseg, offset); 536 idx = nfs4_fl_calc_ds_index(lseg, j); 537 ds = nfs4_fl_prepare_ds(lseg, idx); 538 if (!ds) 539 return PNFS_NOT_ATTEMPTED; 540 541 ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, hdr->inode); 542 if (IS_ERR(ds_clnt)) 543 return PNFS_NOT_ATTEMPTED; 544 545 dprintk("%s USE DS: %s cl_count %d\n", __func__, 546 ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count)); 547 548 /* No multipath support. Use first DS */ 549 atomic_inc(&ds->ds_clp->cl_count); 550 hdr->ds_clp = ds->ds_clp; 551 hdr->ds_idx = idx; 552 fh = nfs4_fl_select_ds_fh(lseg, j); 553 if (fh) 554 hdr->args.fh = fh; 555 556 hdr->args.offset = filelayout_get_dserver_offset(lseg, offset); 557 hdr->mds_offset = offset; 558 559 /* Perform an asynchronous read to ds */ 560 nfs_initiate_pgio(ds_clnt, hdr, 561 &filelayout_read_call_ops, 0, RPC_TASK_SOFTCONN); 562 return PNFS_ATTEMPTED; 563 } 564 565 /* Perform async writes. */ 566 static enum pnfs_try_status 567 filelayout_write_pagelist(struct nfs_pgio_header *hdr, int sync) 568 { 569 struct pnfs_layout_segment *lseg = hdr->lseg; 570 struct nfs4_pnfs_ds *ds; 571 struct rpc_clnt *ds_clnt; 572 loff_t offset = hdr->args.offset; 573 u32 j, idx; 574 struct nfs_fh *fh; 575 576 /* Retrieve the correct rpc_client for the byte range */ 577 j = nfs4_fl_calc_j_index(lseg, offset); 578 idx = nfs4_fl_calc_ds_index(lseg, j); 579 ds = nfs4_fl_prepare_ds(lseg, idx); 580 if (!ds) 581 return PNFS_NOT_ATTEMPTED; 582 583 ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, hdr->inode); 584 if (IS_ERR(ds_clnt)) 585 return PNFS_NOT_ATTEMPTED; 586 587 dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s cl_count %d\n", 588 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count, 589 offset, ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count)); 590 591 hdr->pgio_done_cb = filelayout_write_done_cb; 592 atomic_inc(&ds->ds_clp->cl_count); 593 hdr->ds_clp = ds->ds_clp; 594 hdr->ds_idx = idx; 595 fh = nfs4_fl_select_ds_fh(lseg, j); 596 if (fh) 597 hdr->args.fh = fh; 598 hdr->args.offset = filelayout_get_dserver_offset(lseg, offset); 599 600 /* Perform an asynchronous write */ 601 nfs_initiate_pgio(ds_clnt, hdr, 602 &filelayout_write_call_ops, sync, 603 RPC_TASK_SOFTCONN); 604 return PNFS_ATTEMPTED; 605 } 606 607 /* 608 * filelayout_check_layout() 609 * 610 * Make sure layout segment parameters are sane WRT the device. 611 * At this point no generic layer initialization of the lseg has occurred, 612 * and nothing has been added to the layout_hdr cache. 613 * 614 */ 615 static int 616 filelayout_check_layout(struct pnfs_layout_hdr *lo, 617 struct nfs4_filelayout_segment *fl, 618 struct nfs4_layoutget_res *lgr, 619 struct nfs4_deviceid *id, 620 gfp_t gfp_flags) 621 { 622 struct nfs4_deviceid_node *d; 623 struct nfs4_file_layout_dsaddr *dsaddr; 624 int status = -EINVAL; 625 626 dprintk("--> %s\n", __func__); 627 628 /* FIXME: remove this check when layout segment support is added */ 629 if (lgr->range.offset != 0 || 630 lgr->range.length != NFS4_MAX_UINT64) { 631 dprintk("%s Only whole file layouts supported. Use MDS i/o\n", 632 __func__); 633 goto out; 634 } 635 636 if (fl->pattern_offset > lgr->range.offset) { 637 dprintk("%s pattern_offset %lld too large\n", 638 __func__, fl->pattern_offset); 639 goto out; 640 } 641 642 if (!fl->stripe_unit) { 643 dprintk("%s Invalid stripe unit (%u)\n", 644 __func__, fl->stripe_unit); 645 goto out; 646 } 647 648 /* find and reference the deviceid */ 649 d = nfs4_find_get_deviceid(NFS_SERVER(lo->plh_inode), id, 650 lo->plh_lc_cred, gfp_flags); 651 if (d == NULL) 652 goto out; 653 654 dsaddr = container_of(d, struct nfs4_file_layout_dsaddr, id_node); 655 /* Found deviceid is unavailable */ 656 if (filelayout_test_devid_unavailable(&dsaddr->id_node)) 657 goto out_put; 658 659 fl->dsaddr = dsaddr; 660 661 if (fl->first_stripe_index >= dsaddr->stripe_count) { 662 dprintk("%s Bad first_stripe_index %u\n", 663 __func__, fl->first_stripe_index); 664 goto out_put; 665 } 666 667 if ((fl->stripe_type == STRIPE_SPARSE && 668 fl->num_fh > 1 && fl->num_fh != dsaddr->ds_num) || 669 (fl->stripe_type == STRIPE_DENSE && 670 fl->num_fh != dsaddr->stripe_count)) { 671 dprintk("%s num_fh %u not valid for given packing\n", 672 __func__, fl->num_fh); 673 goto out_put; 674 } 675 676 status = 0; 677 out: 678 dprintk("--> %s returns %d\n", __func__, status); 679 return status; 680 out_put: 681 nfs4_fl_put_deviceid(dsaddr); 682 goto out; 683 } 684 685 static void filelayout_free_fh_array(struct nfs4_filelayout_segment *fl) 686 { 687 int i; 688 689 for (i = 0; i < fl->num_fh; i++) { 690 if (!fl->fh_array[i]) 691 break; 692 kfree(fl->fh_array[i]); 693 } 694 kfree(fl->fh_array); 695 fl->fh_array = NULL; 696 } 697 698 static void 699 _filelayout_free_lseg(struct nfs4_filelayout_segment *fl) 700 { 701 filelayout_free_fh_array(fl); 702 kfree(fl); 703 } 704 705 static int 706 filelayout_decode_layout(struct pnfs_layout_hdr *flo, 707 struct nfs4_filelayout_segment *fl, 708 struct nfs4_layoutget_res *lgr, 709 struct nfs4_deviceid *id, 710 gfp_t gfp_flags) 711 { 712 struct xdr_stream stream; 713 struct xdr_buf buf; 714 struct page *scratch; 715 __be32 *p; 716 uint32_t nfl_util; 717 int i; 718 719 dprintk("%s: set_layout_map Begin\n", __func__); 720 721 scratch = alloc_page(gfp_flags); 722 if (!scratch) 723 return -ENOMEM; 724 725 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages, lgr->layoutp->len); 726 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE); 727 728 /* 20 = ufl_util (4), first_stripe_index (4), pattern_offset (8), 729 * num_fh (4) */ 730 p = xdr_inline_decode(&stream, NFS4_DEVICEID4_SIZE + 20); 731 if (unlikely(!p)) 732 goto out_err; 733 734 memcpy(id, p, sizeof(*id)); 735 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE); 736 nfs4_print_deviceid(id); 737 738 nfl_util = be32_to_cpup(p++); 739 if (nfl_util & NFL4_UFLG_COMMIT_THRU_MDS) 740 fl->commit_through_mds = 1; 741 if (nfl_util & NFL4_UFLG_DENSE) 742 fl->stripe_type = STRIPE_DENSE; 743 else 744 fl->stripe_type = STRIPE_SPARSE; 745 fl->stripe_unit = nfl_util & ~NFL4_UFLG_MASK; 746 747 fl->first_stripe_index = be32_to_cpup(p++); 748 p = xdr_decode_hyper(p, &fl->pattern_offset); 749 fl->num_fh = be32_to_cpup(p++); 750 751 dprintk("%s: nfl_util 0x%X num_fh %u fsi %u po %llu\n", 752 __func__, nfl_util, fl->num_fh, fl->first_stripe_index, 753 fl->pattern_offset); 754 755 /* Note that a zero value for num_fh is legal for STRIPE_SPARSE. 756 * Futher checking is done in filelayout_check_layout */ 757 if (fl->num_fh > 758 max(NFS4_PNFS_MAX_STRIPE_CNT, NFS4_PNFS_MAX_MULTI_CNT)) 759 goto out_err; 760 761 if (fl->num_fh > 0) { 762 fl->fh_array = kcalloc(fl->num_fh, sizeof(fl->fh_array[0]), 763 gfp_flags); 764 if (!fl->fh_array) 765 goto out_err; 766 } 767 768 for (i = 0; i < fl->num_fh; i++) { 769 /* Do we want to use a mempool here? */ 770 fl->fh_array[i] = kmalloc(sizeof(struct nfs_fh), gfp_flags); 771 if (!fl->fh_array[i]) 772 goto out_err_free; 773 774 p = xdr_inline_decode(&stream, 4); 775 if (unlikely(!p)) 776 goto out_err_free; 777 fl->fh_array[i]->size = be32_to_cpup(p++); 778 if (sizeof(struct nfs_fh) < fl->fh_array[i]->size) { 779 printk(KERN_ERR "NFS: Too big fh %d received %d\n", 780 i, fl->fh_array[i]->size); 781 goto out_err_free; 782 } 783 784 p = xdr_inline_decode(&stream, fl->fh_array[i]->size); 785 if (unlikely(!p)) 786 goto out_err_free; 787 memcpy(fl->fh_array[i]->data, p, fl->fh_array[i]->size); 788 dprintk("DEBUG: %s: fh len %d\n", __func__, 789 fl->fh_array[i]->size); 790 } 791 792 __free_page(scratch); 793 return 0; 794 795 out_err_free: 796 filelayout_free_fh_array(fl); 797 out_err: 798 __free_page(scratch); 799 return -EIO; 800 } 801 802 static void 803 filelayout_free_lseg(struct pnfs_layout_segment *lseg) 804 { 805 struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg); 806 807 dprintk("--> %s\n", __func__); 808 nfs4_fl_put_deviceid(fl->dsaddr); 809 /* This assumes a single RW lseg */ 810 if (lseg->pls_range.iomode == IOMODE_RW) { 811 struct nfs4_filelayout *flo; 812 813 flo = FILELAYOUT_FROM_HDR(lseg->pls_layout); 814 flo->commit_info.nbuckets = 0; 815 kfree(flo->commit_info.buckets); 816 flo->commit_info.buckets = NULL; 817 } 818 _filelayout_free_lseg(fl); 819 } 820 821 static int 822 filelayout_alloc_commit_info(struct pnfs_layout_segment *lseg, 823 struct nfs_commit_info *cinfo, 824 gfp_t gfp_flags) 825 { 826 struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg); 827 struct pnfs_commit_bucket *buckets; 828 int size, i; 829 830 if (fl->commit_through_mds) 831 return 0; 832 833 size = (fl->stripe_type == STRIPE_SPARSE) ? 834 fl->dsaddr->ds_num : fl->dsaddr->stripe_count; 835 836 if (cinfo->ds->nbuckets >= size) { 837 /* This assumes there is only one IOMODE_RW lseg. What 838 * we really want to do is have a layout_hdr level 839 * dictionary of <multipath_list4, fh> keys, each 840 * associated with a struct list_head, populated by calls 841 * to filelayout_write_pagelist(). 842 * */ 843 return 0; 844 } 845 846 buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket), 847 gfp_flags); 848 if (!buckets) 849 return -ENOMEM; 850 for (i = 0; i < size; i++) { 851 INIT_LIST_HEAD(&buckets[i].written); 852 INIT_LIST_HEAD(&buckets[i].committing); 853 /* mark direct verifier as unset */ 854 buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW; 855 } 856 857 spin_lock(cinfo->lock); 858 if (cinfo->ds->nbuckets >= size) 859 goto out; 860 for (i = 0; i < cinfo->ds->nbuckets; i++) { 861 list_splice(&cinfo->ds->buckets[i].written, 862 &buckets[i].written); 863 list_splice(&cinfo->ds->buckets[i].committing, 864 &buckets[i].committing); 865 buckets[i].direct_verf.committed = 866 cinfo->ds->buckets[i].direct_verf.committed; 867 buckets[i].wlseg = cinfo->ds->buckets[i].wlseg; 868 buckets[i].clseg = cinfo->ds->buckets[i].clseg; 869 } 870 swap(cinfo->ds->buckets, buckets); 871 cinfo->ds->nbuckets = size; 872 out: 873 spin_unlock(cinfo->lock); 874 kfree(buckets); 875 return 0; 876 } 877 878 static struct pnfs_layout_segment * 879 filelayout_alloc_lseg(struct pnfs_layout_hdr *layoutid, 880 struct nfs4_layoutget_res *lgr, 881 gfp_t gfp_flags) 882 { 883 struct nfs4_filelayout_segment *fl; 884 int rc; 885 struct nfs4_deviceid id; 886 887 dprintk("--> %s\n", __func__); 888 fl = kzalloc(sizeof(*fl), gfp_flags); 889 if (!fl) 890 return NULL; 891 892 rc = filelayout_decode_layout(layoutid, fl, lgr, &id, gfp_flags); 893 if (rc != 0 || filelayout_check_layout(layoutid, fl, lgr, &id, gfp_flags)) { 894 _filelayout_free_lseg(fl); 895 return NULL; 896 } 897 return &fl->generic_hdr; 898 } 899 900 /* 901 * filelayout_pg_test(). Called by nfs_can_coalesce_requests() 902 * 903 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number 904 * of bytes (maximum @req->wb_bytes) that can be coalesced. 905 */ 906 static size_t 907 filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, 908 struct nfs_page *req) 909 { 910 unsigned int size; 911 u64 p_stripe, r_stripe; 912 u32 stripe_offset; 913 u64 segment_offset = pgio->pg_lseg->pls_range.offset; 914 u32 stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit; 915 916 /* calls nfs_generic_pg_test */ 917 size = pnfs_generic_pg_test(pgio, prev, req); 918 if (!size) 919 return 0; 920 921 /* see if req and prev are in the same stripe */ 922 if (prev) { 923 p_stripe = (u64)req_offset(prev) - segment_offset; 924 r_stripe = (u64)req_offset(req) - segment_offset; 925 do_div(p_stripe, stripe_unit); 926 do_div(r_stripe, stripe_unit); 927 928 if (p_stripe != r_stripe) 929 return 0; 930 } 931 932 /* calculate remaining bytes in the current stripe */ 933 div_u64_rem((u64)req_offset(req) - segment_offset, 934 stripe_unit, 935 &stripe_offset); 936 WARN_ON_ONCE(stripe_offset > stripe_unit); 937 if (stripe_offset >= stripe_unit) 938 return 0; 939 return min(stripe_unit - (unsigned int)stripe_offset, size); 940 } 941 942 static void 943 filelayout_pg_init_read(struct nfs_pageio_descriptor *pgio, 944 struct nfs_page *req) 945 { 946 if (!pgio->pg_lseg) 947 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 948 req->wb_context, 949 0, 950 NFS4_MAX_UINT64, 951 IOMODE_READ, 952 GFP_KERNEL); 953 /* If no lseg, fall back to read through mds */ 954 if (pgio->pg_lseg == NULL) 955 nfs_pageio_reset_read_mds(pgio); 956 } 957 958 static void 959 filelayout_pg_init_write(struct nfs_pageio_descriptor *pgio, 960 struct nfs_page *req) 961 { 962 struct nfs_commit_info cinfo; 963 int status; 964 965 if (!pgio->pg_lseg) 966 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 967 req->wb_context, 968 0, 969 NFS4_MAX_UINT64, 970 IOMODE_RW, 971 GFP_NOFS); 972 /* If no lseg, fall back to write through mds */ 973 if (pgio->pg_lseg == NULL) 974 goto out_mds; 975 nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq); 976 status = filelayout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS); 977 if (status < 0) { 978 pnfs_put_lseg(pgio->pg_lseg); 979 pgio->pg_lseg = NULL; 980 goto out_mds; 981 } 982 return; 983 out_mds: 984 nfs_pageio_reset_write_mds(pgio); 985 } 986 987 static const struct nfs_pageio_ops filelayout_pg_read_ops = { 988 .pg_init = filelayout_pg_init_read, 989 .pg_test = filelayout_pg_test, 990 .pg_doio = pnfs_generic_pg_readpages, 991 }; 992 993 static const struct nfs_pageio_ops filelayout_pg_write_ops = { 994 .pg_init = filelayout_pg_init_write, 995 .pg_test = filelayout_pg_test, 996 .pg_doio = pnfs_generic_pg_writepages, 997 }; 998 999 static u32 select_bucket_index(struct nfs4_filelayout_segment *fl, u32 j) 1000 { 1001 if (fl->stripe_type == STRIPE_SPARSE) 1002 return nfs4_fl_calc_ds_index(&fl->generic_hdr, j); 1003 else 1004 return j; 1005 } 1006 1007 /* The generic layer is about to remove the req from the commit list. 1008 * If this will make the bucket empty, it will need to put the lseg reference. 1009 * Note this is must be called holding the inode (/cinfo) lock 1010 */ 1011 static void 1012 filelayout_clear_request_commit(struct nfs_page *req, 1013 struct nfs_commit_info *cinfo) 1014 { 1015 struct pnfs_layout_segment *freeme = NULL; 1016 1017 if (!test_and_clear_bit(PG_COMMIT_TO_DS, &req->wb_flags)) 1018 goto out; 1019 cinfo->ds->nwritten--; 1020 if (list_is_singular(&req->wb_list)) { 1021 struct pnfs_commit_bucket *bucket; 1022 1023 bucket = list_first_entry(&req->wb_list, 1024 struct pnfs_commit_bucket, 1025 written); 1026 freeme = bucket->wlseg; 1027 bucket->wlseg = NULL; 1028 } 1029 out: 1030 nfs_request_remove_commit_list(req, cinfo); 1031 pnfs_put_lseg_locked(freeme); 1032 } 1033 1034 static void 1035 filelayout_mark_request_commit(struct nfs_page *req, 1036 struct pnfs_layout_segment *lseg, 1037 struct nfs_commit_info *cinfo) 1038 1039 { 1040 struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg); 1041 u32 i, j; 1042 struct list_head *list; 1043 struct pnfs_commit_bucket *buckets; 1044 1045 if (fl->commit_through_mds) { 1046 list = &cinfo->mds->list; 1047 spin_lock(cinfo->lock); 1048 goto mds_commit; 1049 } 1050 1051 /* Note that we are calling nfs4_fl_calc_j_index on each page 1052 * that ends up being committed to a data server. An attractive 1053 * alternative is to add a field to nfs_write_data and nfs_page 1054 * to store the value calculated in filelayout_write_pagelist 1055 * and just use that here. 1056 */ 1057 j = nfs4_fl_calc_j_index(lseg, req_offset(req)); 1058 i = select_bucket_index(fl, j); 1059 spin_lock(cinfo->lock); 1060 buckets = cinfo->ds->buckets; 1061 list = &buckets[i].written; 1062 if (list_empty(list)) { 1063 /* Non-empty buckets hold a reference on the lseg. That ref 1064 * is normally transferred to the COMMIT call and released 1065 * there. It could also be released if the last req is pulled 1066 * off due to a rewrite, in which case it will be done in 1067 * filelayout_clear_request_commit 1068 */ 1069 buckets[i].wlseg = pnfs_get_lseg(lseg); 1070 } 1071 set_bit(PG_COMMIT_TO_DS, &req->wb_flags); 1072 cinfo->ds->nwritten++; 1073 1074 mds_commit: 1075 /* nfs_request_add_commit_list(). We need to add req to list without 1076 * dropping cinfo lock. 1077 */ 1078 set_bit(PG_CLEAN, &(req)->wb_flags); 1079 nfs_list_add_request(req, list); 1080 cinfo->mds->ncommit++; 1081 spin_unlock(cinfo->lock); 1082 if (!cinfo->dreq) { 1083 inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); 1084 inc_bdi_stat(page_file_mapping(req->wb_page)->backing_dev_info, 1085 BDI_RECLAIMABLE); 1086 __mark_inode_dirty(req->wb_context->dentry->d_inode, 1087 I_DIRTY_DATASYNC); 1088 } 1089 } 1090 1091 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i) 1092 { 1093 struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); 1094 1095 if (flseg->stripe_type == STRIPE_SPARSE) 1096 return i; 1097 else 1098 return nfs4_fl_calc_ds_index(lseg, i); 1099 } 1100 1101 static struct nfs_fh * 1102 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i) 1103 { 1104 struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); 1105 1106 if (flseg->stripe_type == STRIPE_SPARSE) { 1107 if (flseg->num_fh == 1) 1108 i = 0; 1109 else if (flseg->num_fh == 0) 1110 /* Use the MDS OPEN fh set in nfs_read_rpcsetup */ 1111 return NULL; 1112 } 1113 return flseg->fh_array[i]; 1114 } 1115 1116 static int filelayout_initiate_commit(struct nfs_commit_data *data, int how) 1117 { 1118 struct pnfs_layout_segment *lseg = data->lseg; 1119 struct nfs4_pnfs_ds *ds; 1120 struct rpc_clnt *ds_clnt; 1121 u32 idx; 1122 struct nfs_fh *fh; 1123 1124 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index); 1125 ds = nfs4_fl_prepare_ds(lseg, idx); 1126 if (!ds) 1127 goto out_err; 1128 1129 ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, data->inode); 1130 if (IS_ERR(ds_clnt)) 1131 goto out_err; 1132 1133 dprintk("%s ino %lu, how %d cl_count %d\n", __func__, 1134 data->inode->i_ino, how, atomic_read(&ds->ds_clp->cl_count)); 1135 data->commit_done_cb = filelayout_commit_done_cb; 1136 atomic_inc(&ds->ds_clp->cl_count); 1137 data->ds_clp = ds->ds_clp; 1138 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index); 1139 if (fh) 1140 data->args.fh = fh; 1141 return nfs_initiate_commit(ds_clnt, data, 1142 &filelayout_commit_call_ops, how, 1143 RPC_TASK_SOFTCONN); 1144 out_err: 1145 prepare_to_resend_writes(data); 1146 filelayout_commit_release(data); 1147 return -EAGAIN; 1148 } 1149 1150 static int 1151 transfer_commit_list(struct list_head *src, struct list_head *dst, 1152 struct nfs_commit_info *cinfo, int max) 1153 { 1154 struct nfs_page *req, *tmp; 1155 int ret = 0; 1156 1157 list_for_each_entry_safe(req, tmp, src, wb_list) { 1158 if (!nfs_lock_request(req)) 1159 continue; 1160 kref_get(&req->wb_kref); 1161 if (cond_resched_lock(cinfo->lock)) 1162 list_safe_reset_next(req, tmp, wb_list); 1163 nfs_request_remove_commit_list(req, cinfo); 1164 clear_bit(PG_COMMIT_TO_DS, &req->wb_flags); 1165 nfs_list_add_request(req, dst); 1166 ret++; 1167 if ((ret == max) && !cinfo->dreq) 1168 break; 1169 } 1170 return ret; 1171 } 1172 1173 /* Note called with cinfo->lock held. */ 1174 static int 1175 filelayout_scan_ds_commit_list(struct pnfs_commit_bucket *bucket, 1176 struct nfs_commit_info *cinfo, 1177 int max) 1178 { 1179 struct list_head *src = &bucket->written; 1180 struct list_head *dst = &bucket->committing; 1181 int ret; 1182 1183 ret = transfer_commit_list(src, dst, cinfo, max); 1184 if (ret) { 1185 cinfo->ds->nwritten -= ret; 1186 cinfo->ds->ncommitting += ret; 1187 bucket->clseg = bucket->wlseg; 1188 if (list_empty(src)) 1189 bucket->wlseg = NULL; 1190 else 1191 pnfs_get_lseg(bucket->clseg); 1192 } 1193 return ret; 1194 } 1195 1196 /* Move reqs from written to committing lists, returning count of number moved. 1197 * Note called with cinfo->lock held. 1198 */ 1199 static int filelayout_scan_commit_lists(struct nfs_commit_info *cinfo, 1200 int max) 1201 { 1202 int i, rv = 0, cnt; 1203 1204 for (i = 0; i < cinfo->ds->nbuckets && max != 0; i++) { 1205 cnt = filelayout_scan_ds_commit_list(&cinfo->ds->buckets[i], 1206 cinfo, max); 1207 max -= cnt; 1208 rv += cnt; 1209 } 1210 return rv; 1211 } 1212 1213 /* Pull everything off the committing lists and dump into @dst */ 1214 static void filelayout_recover_commit_reqs(struct list_head *dst, 1215 struct nfs_commit_info *cinfo) 1216 { 1217 struct pnfs_commit_bucket *b; 1218 struct pnfs_layout_segment *freeme; 1219 int i; 1220 1221 restart: 1222 spin_lock(cinfo->lock); 1223 for (i = 0, b = cinfo->ds->buckets; i < cinfo->ds->nbuckets; i++, b++) { 1224 if (transfer_commit_list(&b->written, dst, cinfo, 0)) { 1225 freeme = b->wlseg; 1226 b->wlseg = NULL; 1227 spin_unlock(cinfo->lock); 1228 pnfs_put_lseg(freeme); 1229 goto restart; 1230 } 1231 } 1232 cinfo->ds->nwritten = 0; 1233 spin_unlock(cinfo->lock); 1234 } 1235 1236 /* filelayout_search_commit_reqs - Search lists in @cinfo for the head reqest 1237 * for @page 1238 * @cinfo - commit info for current inode 1239 * @page - page to search for matching head request 1240 * 1241 * Returns a the head request if one is found, otherwise returns NULL. 1242 */ 1243 static struct nfs_page * 1244 filelayout_search_commit_reqs(struct nfs_commit_info *cinfo, struct page *page) 1245 { 1246 struct nfs_page *freq, *t; 1247 struct pnfs_commit_bucket *b; 1248 int i; 1249 1250 /* Linearly search the commit lists for each bucket until a matching 1251 * request is found */ 1252 for (i = 0, b = cinfo->ds->buckets; i < cinfo->ds->nbuckets; i++, b++) { 1253 list_for_each_entry_safe(freq, t, &b->written, wb_list) { 1254 if (freq->wb_page == page) 1255 return freq->wb_head; 1256 } 1257 list_for_each_entry_safe(freq, t, &b->committing, wb_list) { 1258 if (freq->wb_page == page) 1259 return freq->wb_head; 1260 } 1261 } 1262 1263 return NULL; 1264 } 1265 1266 static void filelayout_retry_commit(struct nfs_commit_info *cinfo, int idx) 1267 { 1268 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds; 1269 struct pnfs_commit_bucket *bucket; 1270 struct pnfs_layout_segment *freeme; 1271 int i; 1272 1273 for (i = idx; i < fl_cinfo->nbuckets; i++) { 1274 bucket = &fl_cinfo->buckets[i]; 1275 if (list_empty(&bucket->committing)) 1276 continue; 1277 nfs_retry_commit(&bucket->committing, bucket->clseg, cinfo); 1278 spin_lock(cinfo->lock); 1279 freeme = bucket->clseg; 1280 bucket->clseg = NULL; 1281 spin_unlock(cinfo->lock); 1282 pnfs_put_lseg(freeme); 1283 } 1284 } 1285 1286 static unsigned int 1287 alloc_ds_commits(struct nfs_commit_info *cinfo, struct list_head *list) 1288 { 1289 struct pnfs_ds_commit_info *fl_cinfo; 1290 struct pnfs_commit_bucket *bucket; 1291 struct nfs_commit_data *data; 1292 int i; 1293 unsigned int nreq = 0; 1294 1295 fl_cinfo = cinfo->ds; 1296 bucket = fl_cinfo->buckets; 1297 for (i = 0; i < fl_cinfo->nbuckets; i++, bucket++) { 1298 if (list_empty(&bucket->committing)) 1299 continue; 1300 data = nfs_commitdata_alloc(); 1301 if (!data) 1302 break; 1303 data->ds_commit_index = i; 1304 spin_lock(cinfo->lock); 1305 data->lseg = bucket->clseg; 1306 bucket->clseg = NULL; 1307 spin_unlock(cinfo->lock); 1308 list_add(&data->pages, list); 1309 nreq++; 1310 } 1311 1312 /* Clean up on error */ 1313 filelayout_retry_commit(cinfo, i); 1314 /* Caller will clean up entries put on list */ 1315 return nreq; 1316 } 1317 1318 /* This follows nfs_commit_list pretty closely */ 1319 static int 1320 filelayout_commit_pagelist(struct inode *inode, struct list_head *mds_pages, 1321 int how, struct nfs_commit_info *cinfo) 1322 { 1323 struct nfs_commit_data *data, *tmp; 1324 LIST_HEAD(list); 1325 unsigned int nreq = 0; 1326 1327 if (!list_empty(mds_pages)) { 1328 data = nfs_commitdata_alloc(); 1329 if (data != NULL) { 1330 data->lseg = NULL; 1331 list_add(&data->pages, &list); 1332 nreq++; 1333 } else { 1334 nfs_retry_commit(mds_pages, NULL, cinfo); 1335 filelayout_retry_commit(cinfo, 0); 1336 cinfo->completion_ops->error_cleanup(NFS_I(inode)); 1337 return -ENOMEM; 1338 } 1339 } 1340 1341 nreq += alloc_ds_commits(cinfo, &list); 1342 1343 if (nreq == 0) { 1344 cinfo->completion_ops->error_cleanup(NFS_I(inode)); 1345 goto out; 1346 } 1347 1348 atomic_add(nreq, &cinfo->mds->rpcs_out); 1349 1350 list_for_each_entry_safe(data, tmp, &list, pages) { 1351 list_del_init(&data->pages); 1352 if (!data->lseg) { 1353 nfs_init_commit(data, mds_pages, NULL, cinfo); 1354 nfs_initiate_commit(NFS_CLIENT(inode), data, 1355 data->mds_ops, how, 0); 1356 } else { 1357 struct pnfs_commit_bucket *buckets; 1358 1359 buckets = cinfo->ds->buckets; 1360 nfs_init_commit(data, &buckets[data->ds_commit_index].committing, data->lseg, cinfo); 1361 filelayout_initiate_commit(data, how); 1362 } 1363 } 1364 out: 1365 cinfo->ds->ncommitting = 0; 1366 return PNFS_ATTEMPTED; 1367 } 1368 static struct nfs4_deviceid_node * 1369 filelayout_alloc_deviceid_node(struct nfs_server *server, 1370 struct pnfs_device *pdev, gfp_t gfp_flags) 1371 { 1372 struct nfs4_file_layout_dsaddr *dsaddr; 1373 1374 dsaddr = nfs4_fl_alloc_deviceid_node(server, pdev, gfp_flags); 1375 if (!dsaddr) 1376 return NULL; 1377 return &dsaddr->id_node; 1378 } 1379 1380 static void 1381 filelayout_free_deveiceid_node(struct nfs4_deviceid_node *d) 1382 { 1383 nfs4_fl_free_deviceid(container_of(d, struct nfs4_file_layout_dsaddr, id_node)); 1384 } 1385 1386 static struct pnfs_layout_hdr * 1387 filelayout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags) 1388 { 1389 struct nfs4_filelayout *flo; 1390 1391 flo = kzalloc(sizeof(*flo), gfp_flags); 1392 return flo != NULL ? &flo->generic_hdr : NULL; 1393 } 1394 1395 static void 1396 filelayout_free_layout_hdr(struct pnfs_layout_hdr *lo) 1397 { 1398 kfree(FILELAYOUT_FROM_HDR(lo)); 1399 } 1400 1401 static struct pnfs_ds_commit_info * 1402 filelayout_get_ds_info(struct inode *inode) 1403 { 1404 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout; 1405 1406 if (layout == NULL) 1407 return NULL; 1408 else 1409 return &FILELAYOUT_FROM_HDR(layout)->commit_info; 1410 } 1411 1412 static struct pnfs_layoutdriver_type filelayout_type = { 1413 .id = LAYOUT_NFSV4_1_FILES, 1414 .name = "LAYOUT_NFSV4_1_FILES", 1415 .owner = THIS_MODULE, 1416 .alloc_layout_hdr = filelayout_alloc_layout_hdr, 1417 .free_layout_hdr = filelayout_free_layout_hdr, 1418 .alloc_lseg = filelayout_alloc_lseg, 1419 .free_lseg = filelayout_free_lseg, 1420 .pg_read_ops = &filelayout_pg_read_ops, 1421 .pg_write_ops = &filelayout_pg_write_ops, 1422 .get_ds_info = &filelayout_get_ds_info, 1423 .mark_request_commit = filelayout_mark_request_commit, 1424 .clear_request_commit = filelayout_clear_request_commit, 1425 .scan_commit_lists = filelayout_scan_commit_lists, 1426 .recover_commit_reqs = filelayout_recover_commit_reqs, 1427 .search_commit_reqs = filelayout_search_commit_reqs, 1428 .commit_pagelist = filelayout_commit_pagelist, 1429 .read_pagelist = filelayout_read_pagelist, 1430 .write_pagelist = filelayout_write_pagelist, 1431 .alloc_deviceid_node = filelayout_alloc_deviceid_node, 1432 .free_deviceid_node = filelayout_free_deveiceid_node, 1433 }; 1434 1435 static int __init nfs4filelayout_init(void) 1436 { 1437 printk(KERN_INFO "%s: NFSv4 File Layout Driver Registering...\n", 1438 __func__); 1439 return pnfs_register_layoutdriver(&filelayout_type); 1440 } 1441 1442 static void __exit nfs4filelayout_exit(void) 1443 { 1444 printk(KERN_INFO "%s: NFSv4 File Layout Driver Unregistering...\n", 1445 __func__); 1446 pnfs_unregister_layoutdriver(&filelayout_type); 1447 } 1448 1449 MODULE_ALIAS("nfs-layouttype4-1"); 1450 1451 module_init(nfs4filelayout_init); 1452 module_exit(nfs4filelayout_exit); 1453