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 int filelayout_async_handle_error(struct rpc_task *task, 122 struct nfs4_state *state, 123 struct nfs_client *clp, 124 struct pnfs_layout_segment *lseg) 125 { 126 struct pnfs_layout_hdr *lo = lseg->pls_layout; 127 struct inode *inode = lo->plh_inode; 128 struct nfs_server *mds_server = NFS_SERVER(inode); 129 struct nfs4_deviceid_node *devid = FILELAYOUT_DEVID_NODE(lseg); 130 struct nfs_client *mds_client = mds_server->nfs_client; 131 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table; 132 133 if (task->tk_status >= 0) 134 return 0; 135 136 switch (task->tk_status) { 137 /* MDS state errors */ 138 case -NFS4ERR_DELEG_REVOKED: 139 case -NFS4ERR_ADMIN_REVOKED: 140 case -NFS4ERR_BAD_STATEID: 141 case -NFS4ERR_OPENMODE: 142 if (state == NULL) 143 break; 144 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0) 145 goto out_bad_stateid; 146 goto wait_on_recovery; 147 case -NFS4ERR_EXPIRED: 148 if (state != NULL) { 149 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0) 150 goto out_bad_stateid; 151 } 152 nfs4_schedule_lease_recovery(mds_client); 153 goto wait_on_recovery; 154 /* DS session errors */ 155 case -NFS4ERR_BADSESSION: 156 case -NFS4ERR_BADSLOT: 157 case -NFS4ERR_BAD_HIGH_SLOT: 158 case -NFS4ERR_DEADSESSION: 159 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 160 case -NFS4ERR_SEQ_FALSE_RETRY: 161 case -NFS4ERR_SEQ_MISORDERED: 162 dprintk("%s ERROR %d, Reset session. Exchangeid " 163 "flags 0x%x\n", __func__, task->tk_status, 164 clp->cl_exchange_flags); 165 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status); 166 break; 167 case -NFS4ERR_DELAY: 168 case -NFS4ERR_GRACE: 169 rpc_delay(task, FILELAYOUT_POLL_RETRY_MAX); 170 break; 171 case -NFS4ERR_RETRY_UNCACHED_REP: 172 break; 173 /* Invalidate Layout errors */ 174 case -NFS4ERR_PNFS_NO_LAYOUT: 175 case -ESTALE: /* mapped NFS4ERR_STALE */ 176 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */ 177 case -EISDIR: /* mapped NFS4ERR_ISDIR */ 178 case -NFS4ERR_FHEXPIRED: 179 case -NFS4ERR_WRONG_TYPE: 180 dprintk("%s Invalid layout error %d\n", __func__, 181 task->tk_status); 182 /* 183 * Destroy layout so new i/o will get a new layout. 184 * Layout will not be destroyed until all current lseg 185 * references are put. Mark layout as invalid to resend failed 186 * i/o and all i/o waiting on the slot table to the MDS until 187 * layout is destroyed and a new valid layout is obtained. 188 */ 189 pnfs_destroy_layout(NFS_I(inode)); 190 rpc_wake_up(&tbl->slot_tbl_waitq); 191 goto reset; 192 /* RPC connection errors */ 193 case -ECONNREFUSED: 194 case -EHOSTDOWN: 195 case -EHOSTUNREACH: 196 case -ENETUNREACH: 197 case -EIO: 198 case -ETIMEDOUT: 199 case -EPIPE: 200 dprintk("%s DS connection error %d\n", __func__, 201 task->tk_status); 202 nfs4_mark_deviceid_unavailable(devid); 203 pnfs_error_mark_layout_for_return(inode, lseg); 204 rpc_wake_up(&tbl->slot_tbl_waitq); 205 /* fall through */ 206 default: 207 reset: 208 dprintk("%s Retry through MDS. Error %d\n", __func__, 209 task->tk_status); 210 return -NFS4ERR_RESET_TO_MDS; 211 } 212 out: 213 task->tk_status = 0; 214 return -EAGAIN; 215 out_bad_stateid: 216 task->tk_status = -EIO; 217 return 0; 218 wait_on_recovery: 219 rpc_sleep_on(&mds_client->cl_rpcwaitq, task, NULL); 220 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &mds_client->cl_state) == 0) 221 rpc_wake_up_queued_task(&mds_client->cl_rpcwaitq, task); 222 goto out; 223 } 224 225 /* NFS_PROTO call done callback routines */ 226 227 static int filelayout_read_done_cb(struct rpc_task *task, 228 struct nfs_pgio_header *hdr) 229 { 230 int err; 231 232 trace_nfs4_pnfs_read(hdr, task->tk_status); 233 err = filelayout_async_handle_error(task, hdr->args.context->state, 234 hdr->ds_clp, hdr->lseg); 235 236 switch (err) { 237 case -NFS4ERR_RESET_TO_MDS: 238 filelayout_reset_read(hdr); 239 return task->tk_status; 240 case -EAGAIN: 241 rpc_restart_call_prepare(task); 242 return -EAGAIN; 243 } 244 245 return 0; 246 } 247 248 /* 249 * We reference the rpc_cred of the first WRITE that triggers the need for 250 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound. 251 * rfc5661 is not clear about which credential should be used. 252 */ 253 static void 254 filelayout_set_layoutcommit(struct nfs_pgio_header *hdr) 255 { 256 257 if (FILELAYOUT_LSEG(hdr->lseg)->commit_through_mds || 258 hdr->res.verf->committed != NFS_DATA_SYNC) 259 return; 260 261 pnfs_set_layoutcommit(hdr); 262 dprintk("%s inode %lu pls_end_pos %lu\n", __func__, hdr->inode->i_ino, 263 (unsigned long) NFS_I(hdr->inode)->layout->plh_lwb); 264 } 265 266 bool 267 filelayout_test_devid_unavailable(struct nfs4_deviceid_node *node) 268 { 269 return filelayout_test_devid_invalid(node) || 270 nfs4_test_deviceid_unavailable(node); 271 } 272 273 static bool 274 filelayout_reset_to_mds(struct pnfs_layout_segment *lseg) 275 { 276 struct nfs4_deviceid_node *node = FILELAYOUT_DEVID_NODE(lseg); 277 278 return filelayout_test_devid_unavailable(node); 279 } 280 281 /* 282 * Call ops for the async read/write cases 283 * In the case of dense layouts, the offset needs to be reset to its 284 * original value. 285 */ 286 static void filelayout_read_prepare(struct rpc_task *task, void *data) 287 { 288 struct nfs_pgio_header *hdr = data; 289 290 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 291 rpc_exit(task, -EIO); 292 return; 293 } 294 if (filelayout_reset_to_mds(hdr->lseg)) { 295 dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid); 296 filelayout_reset_read(hdr); 297 rpc_exit(task, 0); 298 return; 299 } 300 hdr->pgio_done_cb = filelayout_read_done_cb; 301 302 if (nfs41_setup_sequence(hdr->ds_clp->cl_session, 303 &hdr->args.seq_args, 304 &hdr->res.seq_res, 305 task)) 306 return; 307 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 308 hdr->args.lock_context, FMODE_READ) == -EIO) 309 rpc_exit(task, -EIO); /* lost lock, terminate I/O */ 310 } 311 312 static void filelayout_read_call_done(struct rpc_task *task, void *data) 313 { 314 struct nfs_pgio_header *hdr = data; 315 316 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status); 317 318 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 319 task->tk_status == 0) { 320 nfs41_sequence_done(task, &hdr->res.seq_res); 321 return; 322 } 323 324 /* Note this may cause RPC to be resent */ 325 hdr->mds_ops->rpc_call_done(task, data); 326 } 327 328 static void filelayout_read_count_stats(struct rpc_task *task, void *data) 329 { 330 struct nfs_pgio_header *hdr = data; 331 332 rpc_count_iostats(task, NFS_SERVER(hdr->inode)->client->cl_metrics); 333 } 334 335 static int filelayout_write_done_cb(struct rpc_task *task, 336 struct nfs_pgio_header *hdr) 337 { 338 int err; 339 340 trace_nfs4_pnfs_write(hdr, task->tk_status); 341 err = filelayout_async_handle_error(task, hdr->args.context->state, 342 hdr->ds_clp, hdr->lseg); 343 344 switch (err) { 345 case -NFS4ERR_RESET_TO_MDS: 346 filelayout_reset_write(hdr); 347 return task->tk_status; 348 case -EAGAIN: 349 rpc_restart_call_prepare(task); 350 return -EAGAIN; 351 } 352 353 filelayout_set_layoutcommit(hdr); 354 return 0; 355 } 356 357 static int filelayout_commit_done_cb(struct rpc_task *task, 358 struct nfs_commit_data *data) 359 { 360 int err; 361 362 trace_nfs4_pnfs_commit_ds(data, task->tk_status); 363 err = filelayout_async_handle_error(task, NULL, data->ds_clp, 364 data->lseg); 365 366 switch (err) { 367 case -NFS4ERR_RESET_TO_MDS: 368 pnfs_generic_prepare_to_resend_writes(data); 369 return -EAGAIN; 370 case -EAGAIN: 371 rpc_restart_call_prepare(task); 372 return -EAGAIN; 373 } 374 375 if (data->verf.committed == NFS_UNSTABLE) 376 pnfs_commit_set_layoutcommit(data); 377 378 return 0; 379 } 380 381 static void filelayout_write_prepare(struct rpc_task *task, void *data) 382 { 383 struct nfs_pgio_header *hdr = data; 384 385 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 386 rpc_exit(task, -EIO); 387 return; 388 } 389 if (filelayout_reset_to_mds(hdr->lseg)) { 390 dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid); 391 filelayout_reset_write(hdr); 392 rpc_exit(task, 0); 393 return; 394 } 395 if (nfs41_setup_sequence(hdr->ds_clp->cl_session, 396 &hdr->args.seq_args, 397 &hdr->res.seq_res, 398 task)) 399 return; 400 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 401 hdr->args.lock_context, FMODE_WRITE) == -EIO) 402 rpc_exit(task, -EIO); /* lost lock, terminate I/O */ 403 } 404 405 static void filelayout_write_call_done(struct rpc_task *task, void *data) 406 { 407 struct nfs_pgio_header *hdr = data; 408 409 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 410 task->tk_status == 0) { 411 nfs41_sequence_done(task, &hdr->res.seq_res); 412 return; 413 } 414 415 /* Note this may cause RPC to be resent */ 416 hdr->mds_ops->rpc_call_done(task, data); 417 } 418 419 static void filelayout_write_count_stats(struct rpc_task *task, void *data) 420 { 421 struct nfs_pgio_header *hdr = data; 422 423 rpc_count_iostats(task, NFS_SERVER(hdr->inode)->client->cl_metrics); 424 } 425 426 static void filelayout_commit_prepare(struct rpc_task *task, void *data) 427 { 428 struct nfs_commit_data *wdata = data; 429 430 nfs41_setup_sequence(wdata->ds_clp->cl_session, 431 &wdata->args.seq_args, 432 &wdata->res.seq_res, 433 task); 434 } 435 436 static void filelayout_commit_count_stats(struct rpc_task *task, void *data) 437 { 438 struct nfs_commit_data *cdata = data; 439 440 rpc_count_iostats(task, NFS_SERVER(cdata->inode)->client->cl_metrics); 441 } 442 443 static const struct rpc_call_ops filelayout_read_call_ops = { 444 .rpc_call_prepare = filelayout_read_prepare, 445 .rpc_call_done = filelayout_read_call_done, 446 .rpc_count_stats = filelayout_read_count_stats, 447 .rpc_release = pnfs_generic_rw_release, 448 }; 449 450 static const struct rpc_call_ops filelayout_write_call_ops = { 451 .rpc_call_prepare = filelayout_write_prepare, 452 .rpc_call_done = filelayout_write_call_done, 453 .rpc_count_stats = filelayout_write_count_stats, 454 .rpc_release = pnfs_generic_rw_release, 455 }; 456 457 static const struct rpc_call_ops filelayout_commit_call_ops = { 458 .rpc_call_prepare = filelayout_commit_prepare, 459 .rpc_call_done = pnfs_generic_write_commit_done, 460 .rpc_count_stats = filelayout_commit_count_stats, 461 .rpc_release = pnfs_generic_commit_release, 462 }; 463 464 static enum pnfs_try_status 465 filelayout_read_pagelist(struct nfs_pgio_header *hdr) 466 { 467 struct pnfs_layout_segment *lseg = hdr->lseg; 468 struct nfs4_pnfs_ds *ds; 469 struct rpc_clnt *ds_clnt; 470 loff_t offset = hdr->args.offset; 471 u32 j, idx; 472 struct nfs_fh *fh; 473 474 dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n", 475 __func__, hdr->inode->i_ino, 476 hdr->args.pgbase, (size_t)hdr->args.count, offset); 477 478 /* Retrieve the correct rpc_client for the byte range */ 479 j = nfs4_fl_calc_j_index(lseg, offset); 480 idx = nfs4_fl_calc_ds_index(lseg, j); 481 ds = nfs4_fl_prepare_ds(lseg, idx); 482 if (!ds) 483 return PNFS_NOT_ATTEMPTED; 484 485 ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, hdr->inode); 486 if (IS_ERR(ds_clnt)) 487 return PNFS_NOT_ATTEMPTED; 488 489 dprintk("%s USE DS: %s cl_count %d\n", __func__, 490 ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count)); 491 492 /* No multipath support. Use first DS */ 493 atomic_inc(&ds->ds_clp->cl_count); 494 hdr->ds_clp = ds->ds_clp; 495 hdr->ds_commit_idx = idx; 496 fh = nfs4_fl_select_ds_fh(lseg, j); 497 if (fh) 498 hdr->args.fh = fh; 499 500 hdr->args.offset = filelayout_get_dserver_offset(lseg, offset); 501 hdr->mds_offset = offset; 502 503 /* Perform an asynchronous read to ds */ 504 nfs_initiate_pgio(ds_clnt, hdr, hdr->cred, 505 NFS_PROTO(hdr->inode), &filelayout_read_call_ops, 506 0, RPC_TASK_SOFTCONN); 507 return PNFS_ATTEMPTED; 508 } 509 510 /* Perform async writes. */ 511 static enum pnfs_try_status 512 filelayout_write_pagelist(struct nfs_pgio_header *hdr, int sync) 513 { 514 struct pnfs_layout_segment *lseg = hdr->lseg; 515 struct nfs4_pnfs_ds *ds; 516 struct rpc_clnt *ds_clnt; 517 loff_t offset = hdr->args.offset; 518 u32 j, idx; 519 struct nfs_fh *fh; 520 521 /* Retrieve the correct rpc_client for the byte range */ 522 j = nfs4_fl_calc_j_index(lseg, offset); 523 idx = nfs4_fl_calc_ds_index(lseg, j); 524 ds = nfs4_fl_prepare_ds(lseg, idx); 525 if (!ds) 526 return PNFS_NOT_ATTEMPTED; 527 528 ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, hdr->inode); 529 if (IS_ERR(ds_clnt)) 530 return PNFS_NOT_ATTEMPTED; 531 532 dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s cl_count %d\n", 533 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count, 534 offset, ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count)); 535 536 hdr->pgio_done_cb = filelayout_write_done_cb; 537 atomic_inc(&ds->ds_clp->cl_count); 538 hdr->ds_clp = ds->ds_clp; 539 hdr->ds_commit_idx = idx; 540 fh = nfs4_fl_select_ds_fh(lseg, j); 541 if (fh) 542 hdr->args.fh = fh; 543 hdr->args.offset = filelayout_get_dserver_offset(lseg, offset); 544 545 /* Perform an asynchronous write */ 546 nfs_initiate_pgio(ds_clnt, hdr, hdr->cred, 547 NFS_PROTO(hdr->inode), &filelayout_write_call_ops, 548 sync, RPC_TASK_SOFTCONN); 549 return PNFS_ATTEMPTED; 550 } 551 552 /* 553 * filelayout_check_layout() 554 * 555 * Make sure layout segment parameters are sane WRT the device. 556 * At this point no generic layer initialization of the lseg has occurred, 557 * and nothing has been added to the layout_hdr cache. 558 * 559 */ 560 static int 561 filelayout_check_layout(struct pnfs_layout_hdr *lo, 562 struct nfs4_filelayout_segment *fl, 563 struct nfs4_layoutget_res *lgr, 564 struct nfs4_deviceid *id, 565 gfp_t gfp_flags) 566 { 567 struct nfs4_deviceid_node *d; 568 struct nfs4_file_layout_dsaddr *dsaddr; 569 int status = -EINVAL; 570 571 dprintk("--> %s\n", __func__); 572 573 /* FIXME: remove this check when layout segment support is added */ 574 if (lgr->range.offset != 0 || 575 lgr->range.length != NFS4_MAX_UINT64) { 576 dprintk("%s Only whole file layouts supported. Use MDS i/o\n", 577 __func__); 578 goto out; 579 } 580 581 if (fl->pattern_offset > lgr->range.offset) { 582 dprintk("%s pattern_offset %lld too large\n", 583 __func__, fl->pattern_offset); 584 goto out; 585 } 586 587 if (!fl->stripe_unit) { 588 dprintk("%s Invalid stripe unit (%u)\n", 589 __func__, fl->stripe_unit); 590 goto out; 591 } 592 593 /* find and reference the deviceid */ 594 d = nfs4_find_get_deviceid(NFS_SERVER(lo->plh_inode), id, 595 lo->plh_lc_cred, gfp_flags); 596 if (d == NULL) 597 goto out; 598 599 dsaddr = container_of(d, struct nfs4_file_layout_dsaddr, id_node); 600 /* Found deviceid is unavailable */ 601 if (filelayout_test_devid_unavailable(&dsaddr->id_node)) 602 goto out_put; 603 604 fl->dsaddr = dsaddr; 605 606 if (fl->first_stripe_index >= dsaddr->stripe_count) { 607 dprintk("%s Bad first_stripe_index %u\n", 608 __func__, fl->first_stripe_index); 609 goto out_put; 610 } 611 612 if ((fl->stripe_type == STRIPE_SPARSE && 613 fl->num_fh > 1 && fl->num_fh != dsaddr->ds_num) || 614 (fl->stripe_type == STRIPE_DENSE && 615 fl->num_fh != dsaddr->stripe_count)) { 616 dprintk("%s num_fh %u not valid for given packing\n", 617 __func__, fl->num_fh); 618 goto out_put; 619 } 620 621 status = 0; 622 out: 623 dprintk("--> %s returns %d\n", __func__, status); 624 return status; 625 out_put: 626 nfs4_fl_put_deviceid(dsaddr); 627 goto out; 628 } 629 630 static void filelayout_free_fh_array(struct nfs4_filelayout_segment *fl) 631 { 632 int i; 633 634 for (i = 0; i < fl->num_fh; i++) { 635 if (!fl->fh_array[i]) 636 break; 637 kfree(fl->fh_array[i]); 638 } 639 kfree(fl->fh_array); 640 fl->fh_array = NULL; 641 } 642 643 static void 644 _filelayout_free_lseg(struct nfs4_filelayout_segment *fl) 645 { 646 filelayout_free_fh_array(fl); 647 kfree(fl); 648 } 649 650 static int 651 filelayout_decode_layout(struct pnfs_layout_hdr *flo, 652 struct nfs4_filelayout_segment *fl, 653 struct nfs4_layoutget_res *lgr, 654 struct nfs4_deviceid *id, 655 gfp_t gfp_flags) 656 { 657 struct xdr_stream stream; 658 struct xdr_buf buf; 659 struct page *scratch; 660 __be32 *p; 661 uint32_t nfl_util; 662 int i; 663 664 dprintk("%s: set_layout_map Begin\n", __func__); 665 666 scratch = alloc_page(gfp_flags); 667 if (!scratch) 668 return -ENOMEM; 669 670 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages, lgr->layoutp->len); 671 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE); 672 673 /* 20 = ufl_util (4), first_stripe_index (4), pattern_offset (8), 674 * num_fh (4) */ 675 p = xdr_inline_decode(&stream, NFS4_DEVICEID4_SIZE + 20); 676 if (unlikely(!p)) 677 goto out_err; 678 679 memcpy(id, p, sizeof(*id)); 680 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE); 681 nfs4_print_deviceid(id); 682 683 nfl_util = be32_to_cpup(p++); 684 if (nfl_util & NFL4_UFLG_COMMIT_THRU_MDS) 685 fl->commit_through_mds = 1; 686 if (nfl_util & NFL4_UFLG_DENSE) 687 fl->stripe_type = STRIPE_DENSE; 688 else 689 fl->stripe_type = STRIPE_SPARSE; 690 fl->stripe_unit = nfl_util & ~NFL4_UFLG_MASK; 691 692 fl->first_stripe_index = be32_to_cpup(p++); 693 p = xdr_decode_hyper(p, &fl->pattern_offset); 694 fl->num_fh = be32_to_cpup(p++); 695 696 dprintk("%s: nfl_util 0x%X num_fh %u fsi %u po %llu\n", 697 __func__, nfl_util, fl->num_fh, fl->first_stripe_index, 698 fl->pattern_offset); 699 700 /* Note that a zero value for num_fh is legal for STRIPE_SPARSE. 701 * Futher checking is done in filelayout_check_layout */ 702 if (fl->num_fh > 703 max(NFS4_PNFS_MAX_STRIPE_CNT, NFS4_PNFS_MAX_MULTI_CNT)) 704 goto out_err; 705 706 if (fl->num_fh > 0) { 707 fl->fh_array = kcalloc(fl->num_fh, sizeof(fl->fh_array[0]), 708 gfp_flags); 709 if (!fl->fh_array) 710 goto out_err; 711 } 712 713 for (i = 0; i < fl->num_fh; i++) { 714 /* Do we want to use a mempool here? */ 715 fl->fh_array[i] = kmalloc(sizeof(struct nfs_fh), gfp_flags); 716 if (!fl->fh_array[i]) 717 goto out_err_free; 718 719 p = xdr_inline_decode(&stream, 4); 720 if (unlikely(!p)) 721 goto out_err_free; 722 fl->fh_array[i]->size = be32_to_cpup(p++); 723 if (sizeof(struct nfs_fh) < fl->fh_array[i]->size) { 724 printk(KERN_ERR "NFS: Too big fh %d received %d\n", 725 i, fl->fh_array[i]->size); 726 goto out_err_free; 727 } 728 729 p = xdr_inline_decode(&stream, fl->fh_array[i]->size); 730 if (unlikely(!p)) 731 goto out_err_free; 732 memcpy(fl->fh_array[i]->data, p, fl->fh_array[i]->size); 733 dprintk("DEBUG: %s: fh len %d\n", __func__, 734 fl->fh_array[i]->size); 735 } 736 737 __free_page(scratch); 738 return 0; 739 740 out_err_free: 741 filelayout_free_fh_array(fl); 742 out_err: 743 __free_page(scratch); 744 return -EIO; 745 } 746 747 static void 748 filelayout_free_lseg(struct pnfs_layout_segment *lseg) 749 { 750 struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg); 751 752 dprintk("--> %s\n", __func__); 753 nfs4_fl_put_deviceid(fl->dsaddr); 754 /* This assumes a single RW lseg */ 755 if (lseg->pls_range.iomode == IOMODE_RW) { 756 struct nfs4_filelayout *flo; 757 758 flo = FILELAYOUT_FROM_HDR(lseg->pls_layout); 759 flo->commit_info.nbuckets = 0; 760 kfree(flo->commit_info.buckets); 761 flo->commit_info.buckets = NULL; 762 } 763 _filelayout_free_lseg(fl); 764 } 765 766 static int 767 filelayout_alloc_commit_info(struct pnfs_layout_segment *lseg, 768 struct nfs_commit_info *cinfo, 769 gfp_t gfp_flags) 770 { 771 struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg); 772 struct pnfs_commit_bucket *buckets; 773 int size, i; 774 775 if (fl->commit_through_mds) 776 return 0; 777 778 size = (fl->stripe_type == STRIPE_SPARSE) ? 779 fl->dsaddr->ds_num : fl->dsaddr->stripe_count; 780 781 if (cinfo->ds->nbuckets >= size) { 782 /* This assumes there is only one IOMODE_RW lseg. What 783 * we really want to do is have a layout_hdr level 784 * dictionary of <multipath_list4, fh> keys, each 785 * associated with a struct list_head, populated by calls 786 * to filelayout_write_pagelist(). 787 * */ 788 return 0; 789 } 790 791 buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket), 792 gfp_flags); 793 if (!buckets) 794 return -ENOMEM; 795 for (i = 0; i < size; i++) { 796 INIT_LIST_HEAD(&buckets[i].written); 797 INIT_LIST_HEAD(&buckets[i].committing); 798 /* mark direct verifier as unset */ 799 buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW; 800 } 801 802 spin_lock(cinfo->lock); 803 if (cinfo->ds->nbuckets >= size) 804 goto out; 805 for (i = 0; i < cinfo->ds->nbuckets; i++) { 806 list_splice(&cinfo->ds->buckets[i].written, 807 &buckets[i].written); 808 list_splice(&cinfo->ds->buckets[i].committing, 809 &buckets[i].committing); 810 buckets[i].direct_verf.committed = 811 cinfo->ds->buckets[i].direct_verf.committed; 812 buckets[i].wlseg = cinfo->ds->buckets[i].wlseg; 813 buckets[i].clseg = cinfo->ds->buckets[i].clseg; 814 } 815 swap(cinfo->ds->buckets, buckets); 816 cinfo->ds->nbuckets = size; 817 out: 818 spin_unlock(cinfo->lock); 819 kfree(buckets); 820 return 0; 821 } 822 823 static struct pnfs_layout_segment * 824 filelayout_alloc_lseg(struct pnfs_layout_hdr *layoutid, 825 struct nfs4_layoutget_res *lgr, 826 gfp_t gfp_flags) 827 { 828 struct nfs4_filelayout_segment *fl; 829 int rc; 830 struct nfs4_deviceid id; 831 832 dprintk("--> %s\n", __func__); 833 fl = kzalloc(sizeof(*fl), gfp_flags); 834 if (!fl) 835 return NULL; 836 837 rc = filelayout_decode_layout(layoutid, fl, lgr, &id, gfp_flags); 838 if (rc != 0 || filelayout_check_layout(layoutid, fl, lgr, &id, gfp_flags)) { 839 _filelayout_free_lseg(fl); 840 return NULL; 841 } 842 return &fl->generic_hdr; 843 } 844 845 /* 846 * filelayout_pg_test(). Called by nfs_can_coalesce_requests() 847 * 848 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number 849 * of bytes (maximum @req->wb_bytes) that can be coalesced. 850 */ 851 static size_t 852 filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, 853 struct nfs_page *req) 854 { 855 unsigned int size; 856 u64 p_stripe, r_stripe; 857 u32 stripe_offset; 858 u64 segment_offset = pgio->pg_lseg->pls_range.offset; 859 u32 stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit; 860 861 /* calls nfs_generic_pg_test */ 862 size = pnfs_generic_pg_test(pgio, prev, req); 863 if (!size) 864 return 0; 865 866 /* see if req and prev are in the same stripe */ 867 if (prev) { 868 p_stripe = (u64)req_offset(prev) - segment_offset; 869 r_stripe = (u64)req_offset(req) - segment_offset; 870 do_div(p_stripe, stripe_unit); 871 do_div(r_stripe, stripe_unit); 872 873 if (p_stripe != r_stripe) 874 return 0; 875 } 876 877 /* calculate remaining bytes in the current stripe */ 878 div_u64_rem((u64)req_offset(req) - segment_offset, 879 stripe_unit, 880 &stripe_offset); 881 WARN_ON_ONCE(stripe_offset > stripe_unit); 882 if (stripe_offset >= stripe_unit) 883 return 0; 884 return min(stripe_unit - (unsigned int)stripe_offset, size); 885 } 886 887 static void 888 filelayout_pg_init_read(struct nfs_pageio_descriptor *pgio, 889 struct nfs_page *req) 890 { 891 if (!pgio->pg_lseg) 892 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 893 req->wb_context, 894 0, 895 NFS4_MAX_UINT64, 896 IOMODE_READ, 897 GFP_KERNEL); 898 /* If no lseg, fall back to read through mds */ 899 if (pgio->pg_lseg == NULL) 900 nfs_pageio_reset_read_mds(pgio); 901 } 902 903 static void 904 filelayout_pg_init_write(struct nfs_pageio_descriptor *pgio, 905 struct nfs_page *req) 906 { 907 struct nfs_commit_info cinfo; 908 int status; 909 910 if (!pgio->pg_lseg) 911 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 912 req->wb_context, 913 0, 914 NFS4_MAX_UINT64, 915 IOMODE_RW, 916 GFP_NOFS); 917 /* If no lseg, fall back to write through mds */ 918 if (pgio->pg_lseg == NULL) 919 goto out_mds; 920 nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq); 921 status = filelayout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS); 922 if (status < 0) { 923 pnfs_put_lseg(pgio->pg_lseg); 924 pgio->pg_lseg = NULL; 925 goto out_mds; 926 } 927 return; 928 out_mds: 929 nfs_pageio_reset_write_mds(pgio); 930 } 931 932 static const struct nfs_pageio_ops filelayout_pg_read_ops = { 933 .pg_init = filelayout_pg_init_read, 934 .pg_test = filelayout_pg_test, 935 .pg_doio = pnfs_generic_pg_readpages, 936 .pg_cleanup = pnfs_generic_pg_cleanup, 937 }; 938 939 static const struct nfs_pageio_ops filelayout_pg_write_ops = { 940 .pg_init = filelayout_pg_init_write, 941 .pg_test = filelayout_pg_test, 942 .pg_doio = pnfs_generic_pg_writepages, 943 .pg_cleanup = pnfs_generic_pg_cleanup, 944 }; 945 946 static u32 select_bucket_index(struct nfs4_filelayout_segment *fl, u32 j) 947 { 948 if (fl->stripe_type == STRIPE_SPARSE) 949 return nfs4_fl_calc_ds_index(&fl->generic_hdr, j); 950 else 951 return j; 952 } 953 954 static void 955 filelayout_mark_request_commit(struct nfs_page *req, 956 struct pnfs_layout_segment *lseg, 957 struct nfs_commit_info *cinfo, 958 u32 ds_commit_idx) 959 960 { 961 struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg); 962 u32 i, j; 963 964 if (fl->commit_through_mds) { 965 nfs_request_add_commit_list(req, &cinfo->mds->list, cinfo); 966 } else { 967 /* Note that we are calling nfs4_fl_calc_j_index on each page 968 * that ends up being committed to a data server. An attractive 969 * alternative is to add a field to nfs_write_data and nfs_page 970 * to store the value calculated in filelayout_write_pagelist 971 * and just use that here. 972 */ 973 j = nfs4_fl_calc_j_index(lseg, req_offset(req)); 974 i = select_bucket_index(fl, j); 975 pnfs_layout_mark_request_commit(req, lseg, cinfo, i); 976 } 977 } 978 979 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i) 980 { 981 struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); 982 983 if (flseg->stripe_type == STRIPE_SPARSE) 984 return i; 985 else 986 return nfs4_fl_calc_ds_index(lseg, i); 987 } 988 989 static struct nfs_fh * 990 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i) 991 { 992 struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); 993 994 if (flseg->stripe_type == STRIPE_SPARSE) { 995 if (flseg->num_fh == 1) 996 i = 0; 997 else if (flseg->num_fh == 0) 998 /* Use the MDS OPEN fh set in nfs_read_rpcsetup */ 999 return NULL; 1000 } 1001 return flseg->fh_array[i]; 1002 } 1003 1004 static int filelayout_initiate_commit(struct nfs_commit_data *data, int how) 1005 { 1006 struct pnfs_layout_segment *lseg = data->lseg; 1007 struct nfs4_pnfs_ds *ds; 1008 struct rpc_clnt *ds_clnt; 1009 u32 idx; 1010 struct nfs_fh *fh; 1011 1012 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index); 1013 ds = nfs4_fl_prepare_ds(lseg, idx); 1014 if (!ds) 1015 goto out_err; 1016 1017 ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, data->inode); 1018 if (IS_ERR(ds_clnt)) 1019 goto out_err; 1020 1021 dprintk("%s ino %lu, how %d cl_count %d\n", __func__, 1022 data->inode->i_ino, how, atomic_read(&ds->ds_clp->cl_count)); 1023 data->commit_done_cb = filelayout_commit_done_cb; 1024 atomic_inc(&ds->ds_clp->cl_count); 1025 data->ds_clp = ds->ds_clp; 1026 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index); 1027 if (fh) 1028 data->args.fh = fh; 1029 return nfs_initiate_commit(ds_clnt, data, NFS_PROTO(data->inode), 1030 &filelayout_commit_call_ops, how, 1031 RPC_TASK_SOFTCONN); 1032 out_err: 1033 pnfs_generic_prepare_to_resend_writes(data); 1034 pnfs_generic_commit_release(data); 1035 return -EAGAIN; 1036 } 1037 1038 /* filelayout_search_commit_reqs - Search lists in @cinfo for the head reqest 1039 * for @page 1040 * @cinfo - commit info for current inode 1041 * @page - page to search for matching head request 1042 * 1043 * Returns a the head request if one is found, otherwise returns NULL. 1044 */ 1045 static struct nfs_page * 1046 filelayout_search_commit_reqs(struct nfs_commit_info *cinfo, struct page *page) 1047 { 1048 struct nfs_page *freq, *t; 1049 struct pnfs_commit_bucket *b; 1050 int i; 1051 1052 /* Linearly search the commit lists for each bucket until a matching 1053 * request is found */ 1054 for (i = 0, b = cinfo->ds->buckets; i < cinfo->ds->nbuckets; i++, b++) { 1055 list_for_each_entry_safe(freq, t, &b->written, wb_list) { 1056 if (freq->wb_page == page) 1057 return freq->wb_head; 1058 } 1059 list_for_each_entry_safe(freq, t, &b->committing, wb_list) { 1060 if (freq->wb_page == page) 1061 return freq->wb_head; 1062 } 1063 } 1064 1065 return NULL; 1066 } 1067 1068 static int 1069 filelayout_commit_pagelist(struct inode *inode, struct list_head *mds_pages, 1070 int how, struct nfs_commit_info *cinfo) 1071 { 1072 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo, 1073 filelayout_initiate_commit); 1074 } 1075 1076 static struct nfs4_deviceid_node * 1077 filelayout_alloc_deviceid_node(struct nfs_server *server, 1078 struct pnfs_device *pdev, gfp_t gfp_flags) 1079 { 1080 struct nfs4_file_layout_dsaddr *dsaddr; 1081 1082 dsaddr = nfs4_fl_alloc_deviceid_node(server, pdev, gfp_flags); 1083 if (!dsaddr) 1084 return NULL; 1085 return &dsaddr->id_node; 1086 } 1087 1088 static void 1089 filelayout_free_deveiceid_node(struct nfs4_deviceid_node *d) 1090 { 1091 nfs4_fl_free_deviceid(container_of(d, struct nfs4_file_layout_dsaddr, id_node)); 1092 } 1093 1094 static struct pnfs_layout_hdr * 1095 filelayout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags) 1096 { 1097 struct nfs4_filelayout *flo; 1098 1099 flo = kzalloc(sizeof(*flo), gfp_flags); 1100 return flo != NULL ? &flo->generic_hdr : NULL; 1101 } 1102 1103 static void 1104 filelayout_free_layout_hdr(struct pnfs_layout_hdr *lo) 1105 { 1106 kfree(FILELAYOUT_FROM_HDR(lo)); 1107 } 1108 1109 static struct pnfs_ds_commit_info * 1110 filelayout_get_ds_info(struct inode *inode) 1111 { 1112 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout; 1113 1114 if (layout == NULL) 1115 return NULL; 1116 else 1117 return &FILELAYOUT_FROM_HDR(layout)->commit_info; 1118 } 1119 1120 static struct pnfs_layoutdriver_type filelayout_type = { 1121 .id = LAYOUT_NFSV4_1_FILES, 1122 .name = "LAYOUT_NFSV4_1_FILES", 1123 .owner = THIS_MODULE, 1124 .alloc_layout_hdr = filelayout_alloc_layout_hdr, 1125 .free_layout_hdr = filelayout_free_layout_hdr, 1126 .alloc_lseg = filelayout_alloc_lseg, 1127 .free_lseg = filelayout_free_lseg, 1128 .pg_read_ops = &filelayout_pg_read_ops, 1129 .pg_write_ops = &filelayout_pg_write_ops, 1130 .get_ds_info = &filelayout_get_ds_info, 1131 .mark_request_commit = filelayout_mark_request_commit, 1132 .clear_request_commit = pnfs_generic_clear_request_commit, 1133 .scan_commit_lists = pnfs_generic_scan_commit_lists, 1134 .recover_commit_reqs = pnfs_generic_recover_commit_reqs, 1135 .search_commit_reqs = filelayout_search_commit_reqs, 1136 .commit_pagelist = filelayout_commit_pagelist, 1137 .read_pagelist = filelayout_read_pagelist, 1138 .write_pagelist = filelayout_write_pagelist, 1139 .alloc_deviceid_node = filelayout_alloc_deviceid_node, 1140 .free_deviceid_node = filelayout_free_deveiceid_node, 1141 }; 1142 1143 static int __init nfs4filelayout_init(void) 1144 { 1145 printk(KERN_INFO "%s: NFSv4 File Layout Driver Registering...\n", 1146 __func__); 1147 return pnfs_register_layoutdriver(&filelayout_type); 1148 } 1149 1150 static void __exit nfs4filelayout_exit(void) 1151 { 1152 printk(KERN_INFO "%s: NFSv4 File Layout Driver Unregistering...\n", 1153 __func__); 1154 pnfs_unregister_layoutdriver(&filelayout_type); 1155 } 1156 1157 MODULE_ALIAS("nfs-layouttype4-1"); 1158 1159 module_init(nfs4filelayout_init); 1160 module_exit(nfs4filelayout_exit); 1161