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->inode, hdr->lseg, 262 hdr->mds_offset + hdr->res.count); 263 dprintk("%s inode %lu pls_end_pos %lu\n", __func__, hdr->inode->i_ino, 264 (unsigned long) NFS_I(hdr->inode)->layout->plh_lwb); 265 } 266 267 bool 268 filelayout_test_devid_unavailable(struct nfs4_deviceid_node *node) 269 { 270 return filelayout_test_devid_invalid(node) || 271 nfs4_test_deviceid_unavailable(node); 272 } 273 274 static bool 275 filelayout_reset_to_mds(struct pnfs_layout_segment *lseg) 276 { 277 struct nfs4_deviceid_node *node = FILELAYOUT_DEVID_NODE(lseg); 278 279 return filelayout_test_devid_unavailable(node); 280 } 281 282 /* 283 * Call ops for the async read/write cases 284 * In the case of dense layouts, the offset needs to be reset to its 285 * original value. 286 */ 287 static void filelayout_read_prepare(struct rpc_task *task, void *data) 288 { 289 struct nfs_pgio_header *hdr = data; 290 291 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 292 rpc_exit(task, -EIO); 293 return; 294 } 295 if (filelayout_reset_to_mds(hdr->lseg)) { 296 dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid); 297 filelayout_reset_read(hdr); 298 rpc_exit(task, 0); 299 return; 300 } 301 hdr->pgio_done_cb = filelayout_read_done_cb; 302 303 if (nfs41_setup_sequence(hdr->ds_clp->cl_session, 304 &hdr->args.seq_args, 305 &hdr->res.seq_res, 306 task)) 307 return; 308 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 309 hdr->args.lock_context, FMODE_READ) == -EIO) 310 rpc_exit(task, -EIO); /* lost lock, terminate I/O */ 311 } 312 313 static void filelayout_read_call_done(struct rpc_task *task, void *data) 314 { 315 struct nfs_pgio_header *hdr = data; 316 317 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status); 318 319 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 320 task->tk_status == 0) { 321 nfs41_sequence_done(task, &hdr->res.seq_res); 322 return; 323 } 324 325 /* Note this may cause RPC to be resent */ 326 hdr->mds_ops->rpc_call_done(task, data); 327 } 328 329 static void filelayout_read_count_stats(struct rpc_task *task, void *data) 330 { 331 struct nfs_pgio_header *hdr = data; 332 333 rpc_count_iostats(task, NFS_SERVER(hdr->inode)->client->cl_metrics); 334 } 335 336 static int filelayout_write_done_cb(struct rpc_task *task, 337 struct nfs_pgio_header *hdr) 338 { 339 int err; 340 341 trace_nfs4_pnfs_write(hdr, task->tk_status); 342 err = filelayout_async_handle_error(task, hdr->args.context->state, 343 hdr->ds_clp, hdr->lseg); 344 345 switch (err) { 346 case -NFS4ERR_RESET_TO_MDS: 347 filelayout_reset_write(hdr); 348 return task->tk_status; 349 case -EAGAIN: 350 rpc_restart_call_prepare(task); 351 return -EAGAIN; 352 } 353 354 filelayout_set_layoutcommit(hdr); 355 return 0; 356 } 357 358 static int filelayout_commit_done_cb(struct rpc_task *task, 359 struct nfs_commit_data *data) 360 { 361 int err; 362 363 trace_nfs4_pnfs_commit_ds(data, task->tk_status); 364 err = filelayout_async_handle_error(task, NULL, data->ds_clp, 365 data->lseg); 366 367 switch (err) { 368 case -NFS4ERR_RESET_TO_MDS: 369 pnfs_generic_prepare_to_resend_writes(data); 370 return -EAGAIN; 371 case -EAGAIN: 372 rpc_restart_call_prepare(task); 373 return -EAGAIN; 374 } 375 376 if (data->verf.committed == NFS_UNSTABLE) 377 pnfs_set_layoutcommit(data->inode, data->lseg, data->lwb); 378 379 return 0; 380 } 381 382 static void filelayout_write_prepare(struct rpc_task *task, void *data) 383 { 384 struct nfs_pgio_header *hdr = data; 385 386 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 387 rpc_exit(task, -EIO); 388 return; 389 } 390 if (filelayout_reset_to_mds(hdr->lseg)) { 391 dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid); 392 filelayout_reset_write(hdr); 393 rpc_exit(task, 0); 394 return; 395 } 396 if (nfs41_setup_sequence(hdr->ds_clp->cl_session, 397 &hdr->args.seq_args, 398 &hdr->res.seq_res, 399 task)) 400 return; 401 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 402 hdr->args.lock_context, FMODE_WRITE) == -EIO) 403 rpc_exit(task, -EIO); /* lost lock, terminate I/O */ 404 } 405 406 static void filelayout_write_call_done(struct rpc_task *task, void *data) 407 { 408 struct nfs_pgio_header *hdr = data; 409 410 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 411 task->tk_status == 0) { 412 nfs41_sequence_done(task, &hdr->res.seq_res); 413 return; 414 } 415 416 /* Note this may cause RPC to be resent */ 417 hdr->mds_ops->rpc_call_done(task, data); 418 } 419 420 static void filelayout_write_count_stats(struct rpc_task *task, void *data) 421 { 422 struct nfs_pgio_header *hdr = data; 423 424 rpc_count_iostats(task, NFS_SERVER(hdr->inode)->client->cl_metrics); 425 } 426 427 static void filelayout_commit_prepare(struct rpc_task *task, void *data) 428 { 429 struct nfs_commit_data *wdata = data; 430 431 nfs41_setup_sequence(wdata->ds_clp->cl_session, 432 &wdata->args.seq_args, 433 &wdata->res.seq_res, 434 task); 435 } 436 437 static void filelayout_commit_count_stats(struct rpc_task *task, void *data) 438 { 439 struct nfs_commit_data *cdata = data; 440 441 rpc_count_iostats(task, NFS_SERVER(cdata->inode)->client->cl_metrics); 442 } 443 444 static const struct rpc_call_ops filelayout_read_call_ops = { 445 .rpc_call_prepare = filelayout_read_prepare, 446 .rpc_call_done = filelayout_read_call_done, 447 .rpc_count_stats = filelayout_read_count_stats, 448 .rpc_release = pnfs_generic_rw_release, 449 }; 450 451 static const struct rpc_call_ops filelayout_write_call_ops = { 452 .rpc_call_prepare = filelayout_write_prepare, 453 .rpc_call_done = filelayout_write_call_done, 454 .rpc_count_stats = filelayout_write_count_stats, 455 .rpc_release = pnfs_generic_rw_release, 456 }; 457 458 static const struct rpc_call_ops filelayout_commit_call_ops = { 459 .rpc_call_prepare = filelayout_commit_prepare, 460 .rpc_call_done = pnfs_generic_write_commit_done, 461 .rpc_count_stats = filelayout_commit_count_stats, 462 .rpc_release = pnfs_generic_commit_release, 463 }; 464 465 static enum pnfs_try_status 466 filelayout_read_pagelist(struct nfs_pgio_header *hdr) 467 { 468 struct pnfs_layout_segment *lseg = hdr->lseg; 469 struct nfs4_pnfs_ds *ds; 470 struct rpc_clnt *ds_clnt; 471 loff_t offset = hdr->args.offset; 472 u32 j, idx; 473 struct nfs_fh *fh; 474 475 dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n", 476 __func__, hdr->inode->i_ino, 477 hdr->args.pgbase, (size_t)hdr->args.count, offset); 478 479 /* Retrieve the correct rpc_client for the byte range */ 480 j = nfs4_fl_calc_j_index(lseg, offset); 481 idx = nfs4_fl_calc_ds_index(lseg, j); 482 ds = nfs4_fl_prepare_ds(lseg, idx); 483 if (!ds) 484 return PNFS_NOT_ATTEMPTED; 485 486 ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, hdr->inode); 487 if (IS_ERR(ds_clnt)) 488 return PNFS_NOT_ATTEMPTED; 489 490 dprintk("%s USE DS: %s cl_count %d\n", __func__, 491 ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count)); 492 493 /* No multipath support. Use first DS */ 494 atomic_inc(&ds->ds_clp->cl_count); 495 hdr->ds_clp = ds->ds_clp; 496 hdr->ds_commit_idx = idx; 497 fh = nfs4_fl_select_ds_fh(lseg, j); 498 if (fh) 499 hdr->args.fh = fh; 500 501 hdr->args.offset = filelayout_get_dserver_offset(lseg, offset); 502 hdr->mds_offset = offset; 503 504 /* Perform an asynchronous read to ds */ 505 nfs_initiate_pgio(ds_clnt, hdr, hdr->cred, 506 NFS_PROTO(hdr->inode), &filelayout_read_call_ops, 507 0, RPC_TASK_SOFTCONN); 508 return PNFS_ATTEMPTED; 509 } 510 511 /* Perform async writes. */ 512 static enum pnfs_try_status 513 filelayout_write_pagelist(struct nfs_pgio_header *hdr, int sync) 514 { 515 struct pnfs_layout_segment *lseg = hdr->lseg; 516 struct nfs4_pnfs_ds *ds; 517 struct rpc_clnt *ds_clnt; 518 loff_t offset = hdr->args.offset; 519 u32 j, idx; 520 struct nfs_fh *fh; 521 522 /* Retrieve the correct rpc_client for the byte range */ 523 j = nfs4_fl_calc_j_index(lseg, offset); 524 idx = nfs4_fl_calc_ds_index(lseg, j); 525 ds = nfs4_fl_prepare_ds(lseg, idx); 526 if (!ds) 527 return PNFS_NOT_ATTEMPTED; 528 529 ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, hdr->inode); 530 if (IS_ERR(ds_clnt)) 531 return PNFS_NOT_ATTEMPTED; 532 533 dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s cl_count %d\n", 534 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count, 535 offset, ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count)); 536 537 hdr->pgio_done_cb = filelayout_write_done_cb; 538 atomic_inc(&ds->ds_clp->cl_count); 539 hdr->ds_clp = ds->ds_clp; 540 hdr->ds_commit_idx = idx; 541 fh = nfs4_fl_select_ds_fh(lseg, j); 542 if (fh) 543 hdr->args.fh = fh; 544 hdr->args.offset = filelayout_get_dserver_offset(lseg, offset); 545 546 /* Perform an asynchronous write */ 547 nfs_initiate_pgio(ds_clnt, hdr, hdr->cred, 548 NFS_PROTO(hdr->inode), &filelayout_write_call_ops, 549 sync, RPC_TASK_SOFTCONN); 550 return PNFS_ATTEMPTED; 551 } 552 553 /* 554 * filelayout_check_layout() 555 * 556 * Make sure layout segment parameters are sane WRT the device. 557 * At this point no generic layer initialization of the lseg has occurred, 558 * and nothing has been added to the layout_hdr cache. 559 * 560 */ 561 static int 562 filelayout_check_layout(struct pnfs_layout_hdr *lo, 563 struct nfs4_filelayout_segment *fl, 564 struct nfs4_layoutget_res *lgr, 565 struct nfs4_deviceid *id, 566 gfp_t gfp_flags) 567 { 568 struct nfs4_deviceid_node *d; 569 struct nfs4_file_layout_dsaddr *dsaddr; 570 int status = -EINVAL; 571 572 dprintk("--> %s\n", __func__); 573 574 /* FIXME: remove this check when layout segment support is added */ 575 if (lgr->range.offset != 0 || 576 lgr->range.length != NFS4_MAX_UINT64) { 577 dprintk("%s Only whole file layouts supported. Use MDS i/o\n", 578 __func__); 579 goto out; 580 } 581 582 if (fl->pattern_offset > lgr->range.offset) { 583 dprintk("%s pattern_offset %lld too large\n", 584 __func__, fl->pattern_offset); 585 goto out; 586 } 587 588 if (!fl->stripe_unit) { 589 dprintk("%s Invalid stripe unit (%u)\n", 590 __func__, fl->stripe_unit); 591 goto out; 592 } 593 594 /* find and reference the deviceid */ 595 d = nfs4_find_get_deviceid(NFS_SERVER(lo->plh_inode), id, 596 lo->plh_lc_cred, gfp_flags); 597 if (d == NULL) 598 goto out; 599 600 dsaddr = container_of(d, struct nfs4_file_layout_dsaddr, id_node); 601 /* Found deviceid is unavailable */ 602 if (filelayout_test_devid_unavailable(&dsaddr->id_node)) 603 goto out_put; 604 605 fl->dsaddr = dsaddr; 606 607 if (fl->first_stripe_index >= dsaddr->stripe_count) { 608 dprintk("%s Bad first_stripe_index %u\n", 609 __func__, fl->first_stripe_index); 610 goto out_put; 611 } 612 613 if ((fl->stripe_type == STRIPE_SPARSE && 614 fl->num_fh > 1 && fl->num_fh != dsaddr->ds_num) || 615 (fl->stripe_type == STRIPE_DENSE && 616 fl->num_fh != dsaddr->stripe_count)) { 617 dprintk("%s num_fh %u not valid for given packing\n", 618 __func__, fl->num_fh); 619 goto out_put; 620 } 621 622 status = 0; 623 out: 624 dprintk("--> %s returns %d\n", __func__, status); 625 return status; 626 out_put: 627 nfs4_fl_put_deviceid(dsaddr); 628 goto out; 629 } 630 631 static void filelayout_free_fh_array(struct nfs4_filelayout_segment *fl) 632 { 633 int i; 634 635 for (i = 0; i < fl->num_fh; i++) { 636 if (!fl->fh_array[i]) 637 break; 638 kfree(fl->fh_array[i]); 639 } 640 kfree(fl->fh_array); 641 fl->fh_array = NULL; 642 } 643 644 static void 645 _filelayout_free_lseg(struct nfs4_filelayout_segment *fl) 646 { 647 filelayout_free_fh_array(fl); 648 kfree(fl); 649 } 650 651 static int 652 filelayout_decode_layout(struct pnfs_layout_hdr *flo, 653 struct nfs4_filelayout_segment *fl, 654 struct nfs4_layoutget_res *lgr, 655 struct nfs4_deviceid *id, 656 gfp_t gfp_flags) 657 { 658 struct xdr_stream stream; 659 struct xdr_buf buf; 660 struct page *scratch; 661 __be32 *p; 662 uint32_t nfl_util; 663 int i; 664 665 dprintk("%s: set_layout_map Begin\n", __func__); 666 667 scratch = alloc_page(gfp_flags); 668 if (!scratch) 669 return -ENOMEM; 670 671 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages, lgr->layoutp->len); 672 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE); 673 674 /* 20 = ufl_util (4), first_stripe_index (4), pattern_offset (8), 675 * num_fh (4) */ 676 p = xdr_inline_decode(&stream, NFS4_DEVICEID4_SIZE + 20); 677 if (unlikely(!p)) 678 goto out_err; 679 680 memcpy(id, p, sizeof(*id)); 681 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE); 682 nfs4_print_deviceid(id); 683 684 nfl_util = be32_to_cpup(p++); 685 if (nfl_util & NFL4_UFLG_COMMIT_THRU_MDS) 686 fl->commit_through_mds = 1; 687 if (nfl_util & NFL4_UFLG_DENSE) 688 fl->stripe_type = STRIPE_DENSE; 689 else 690 fl->stripe_type = STRIPE_SPARSE; 691 fl->stripe_unit = nfl_util & ~NFL4_UFLG_MASK; 692 693 fl->first_stripe_index = be32_to_cpup(p++); 694 p = xdr_decode_hyper(p, &fl->pattern_offset); 695 fl->num_fh = be32_to_cpup(p++); 696 697 dprintk("%s: nfl_util 0x%X num_fh %u fsi %u po %llu\n", 698 __func__, nfl_util, fl->num_fh, fl->first_stripe_index, 699 fl->pattern_offset); 700 701 /* Note that a zero value for num_fh is legal for STRIPE_SPARSE. 702 * Futher checking is done in filelayout_check_layout */ 703 if (fl->num_fh > 704 max(NFS4_PNFS_MAX_STRIPE_CNT, NFS4_PNFS_MAX_MULTI_CNT)) 705 goto out_err; 706 707 if (fl->num_fh > 0) { 708 fl->fh_array = kcalloc(fl->num_fh, sizeof(fl->fh_array[0]), 709 gfp_flags); 710 if (!fl->fh_array) 711 goto out_err; 712 } 713 714 for (i = 0; i < fl->num_fh; i++) { 715 /* Do we want to use a mempool here? */ 716 fl->fh_array[i] = kmalloc(sizeof(struct nfs_fh), gfp_flags); 717 if (!fl->fh_array[i]) 718 goto out_err_free; 719 720 p = xdr_inline_decode(&stream, 4); 721 if (unlikely(!p)) 722 goto out_err_free; 723 fl->fh_array[i]->size = be32_to_cpup(p++); 724 if (sizeof(struct nfs_fh) < fl->fh_array[i]->size) { 725 printk(KERN_ERR "NFS: Too big fh %d received %d\n", 726 i, fl->fh_array[i]->size); 727 goto out_err_free; 728 } 729 730 p = xdr_inline_decode(&stream, fl->fh_array[i]->size); 731 if (unlikely(!p)) 732 goto out_err_free; 733 memcpy(fl->fh_array[i]->data, p, fl->fh_array[i]->size); 734 dprintk("DEBUG: %s: fh len %d\n", __func__, 735 fl->fh_array[i]->size); 736 } 737 738 __free_page(scratch); 739 return 0; 740 741 out_err_free: 742 filelayout_free_fh_array(fl); 743 out_err: 744 __free_page(scratch); 745 return -EIO; 746 } 747 748 static void 749 filelayout_free_lseg(struct pnfs_layout_segment *lseg) 750 { 751 struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg); 752 753 dprintk("--> %s\n", __func__); 754 nfs4_fl_put_deviceid(fl->dsaddr); 755 /* This assumes a single RW lseg */ 756 if (lseg->pls_range.iomode == IOMODE_RW) { 757 struct nfs4_filelayout *flo; 758 759 flo = FILELAYOUT_FROM_HDR(lseg->pls_layout); 760 flo->commit_info.nbuckets = 0; 761 kfree(flo->commit_info.buckets); 762 flo->commit_info.buckets = NULL; 763 } 764 _filelayout_free_lseg(fl); 765 } 766 767 static int 768 filelayout_alloc_commit_info(struct pnfs_layout_segment *lseg, 769 struct nfs_commit_info *cinfo, 770 gfp_t gfp_flags) 771 { 772 struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg); 773 struct pnfs_commit_bucket *buckets; 774 int size, i; 775 776 if (fl->commit_through_mds) 777 return 0; 778 779 size = (fl->stripe_type == STRIPE_SPARSE) ? 780 fl->dsaddr->ds_num : fl->dsaddr->stripe_count; 781 782 if (cinfo->ds->nbuckets >= size) { 783 /* This assumes there is only one IOMODE_RW lseg. What 784 * we really want to do is have a layout_hdr level 785 * dictionary of <multipath_list4, fh> keys, each 786 * associated with a struct list_head, populated by calls 787 * to filelayout_write_pagelist(). 788 * */ 789 return 0; 790 } 791 792 buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket), 793 gfp_flags); 794 if (!buckets) 795 return -ENOMEM; 796 for (i = 0; i < size; i++) { 797 INIT_LIST_HEAD(&buckets[i].written); 798 INIT_LIST_HEAD(&buckets[i].committing); 799 /* mark direct verifier as unset */ 800 buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW; 801 } 802 803 spin_lock(cinfo->lock); 804 if (cinfo->ds->nbuckets >= size) 805 goto out; 806 for (i = 0; i < cinfo->ds->nbuckets; i++) { 807 list_splice(&cinfo->ds->buckets[i].written, 808 &buckets[i].written); 809 list_splice(&cinfo->ds->buckets[i].committing, 810 &buckets[i].committing); 811 buckets[i].direct_verf.committed = 812 cinfo->ds->buckets[i].direct_verf.committed; 813 buckets[i].wlseg = cinfo->ds->buckets[i].wlseg; 814 buckets[i].clseg = cinfo->ds->buckets[i].clseg; 815 } 816 swap(cinfo->ds->buckets, buckets); 817 cinfo->ds->nbuckets = size; 818 out: 819 spin_unlock(cinfo->lock); 820 kfree(buckets); 821 return 0; 822 } 823 824 static struct pnfs_layout_segment * 825 filelayout_alloc_lseg(struct pnfs_layout_hdr *layoutid, 826 struct nfs4_layoutget_res *lgr, 827 gfp_t gfp_flags) 828 { 829 struct nfs4_filelayout_segment *fl; 830 int rc; 831 struct nfs4_deviceid id; 832 833 dprintk("--> %s\n", __func__); 834 fl = kzalloc(sizeof(*fl), gfp_flags); 835 if (!fl) 836 return NULL; 837 838 rc = filelayout_decode_layout(layoutid, fl, lgr, &id, gfp_flags); 839 if (rc != 0 || filelayout_check_layout(layoutid, fl, lgr, &id, gfp_flags)) { 840 _filelayout_free_lseg(fl); 841 return NULL; 842 } 843 return &fl->generic_hdr; 844 } 845 846 /* 847 * filelayout_pg_test(). Called by nfs_can_coalesce_requests() 848 * 849 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number 850 * of bytes (maximum @req->wb_bytes) that can be coalesced. 851 */ 852 static size_t 853 filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, 854 struct nfs_page *req) 855 { 856 unsigned int size; 857 u64 p_stripe, r_stripe; 858 u32 stripe_offset; 859 u64 segment_offset = pgio->pg_lseg->pls_range.offset; 860 u32 stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit; 861 862 /* calls nfs_generic_pg_test */ 863 size = pnfs_generic_pg_test(pgio, prev, req); 864 if (!size) 865 return 0; 866 867 /* see if req and prev are in the same stripe */ 868 if (prev) { 869 p_stripe = (u64)req_offset(prev) - segment_offset; 870 r_stripe = (u64)req_offset(req) - segment_offset; 871 do_div(p_stripe, stripe_unit); 872 do_div(r_stripe, stripe_unit); 873 874 if (p_stripe != r_stripe) 875 return 0; 876 } 877 878 /* calculate remaining bytes in the current stripe */ 879 div_u64_rem((u64)req_offset(req) - segment_offset, 880 stripe_unit, 881 &stripe_offset); 882 WARN_ON_ONCE(stripe_offset > stripe_unit); 883 if (stripe_offset >= stripe_unit) 884 return 0; 885 return min(stripe_unit - (unsigned int)stripe_offset, size); 886 } 887 888 static void 889 filelayout_pg_init_read(struct nfs_pageio_descriptor *pgio, 890 struct nfs_page *req) 891 { 892 if (!pgio->pg_lseg) 893 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 894 req->wb_context, 895 0, 896 NFS4_MAX_UINT64, 897 IOMODE_READ, 898 GFP_KERNEL); 899 /* If no lseg, fall back to read through mds */ 900 if (pgio->pg_lseg == NULL) 901 nfs_pageio_reset_read_mds(pgio); 902 } 903 904 static void 905 filelayout_pg_init_write(struct nfs_pageio_descriptor *pgio, 906 struct nfs_page *req) 907 { 908 struct nfs_commit_info cinfo; 909 int status; 910 911 if (!pgio->pg_lseg) 912 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 913 req->wb_context, 914 0, 915 NFS4_MAX_UINT64, 916 IOMODE_RW, 917 GFP_NOFS); 918 /* If no lseg, fall back to write through mds */ 919 if (pgio->pg_lseg == NULL) 920 goto out_mds; 921 nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq); 922 status = filelayout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS); 923 if (status < 0) { 924 pnfs_put_lseg(pgio->pg_lseg); 925 pgio->pg_lseg = NULL; 926 goto out_mds; 927 } 928 return; 929 out_mds: 930 nfs_pageio_reset_write_mds(pgio); 931 } 932 933 static const struct nfs_pageio_ops filelayout_pg_read_ops = { 934 .pg_init = filelayout_pg_init_read, 935 .pg_test = filelayout_pg_test, 936 .pg_doio = pnfs_generic_pg_readpages, 937 .pg_cleanup = pnfs_generic_pg_cleanup, 938 }; 939 940 static const struct nfs_pageio_ops filelayout_pg_write_ops = { 941 .pg_init = filelayout_pg_init_write, 942 .pg_test = filelayout_pg_test, 943 .pg_doio = pnfs_generic_pg_writepages, 944 .pg_cleanup = pnfs_generic_pg_cleanup, 945 }; 946 947 static u32 select_bucket_index(struct nfs4_filelayout_segment *fl, u32 j) 948 { 949 if (fl->stripe_type == STRIPE_SPARSE) 950 return nfs4_fl_calc_ds_index(&fl->generic_hdr, j); 951 else 952 return j; 953 } 954 955 static void 956 filelayout_mark_request_commit(struct nfs_page *req, 957 struct pnfs_layout_segment *lseg, 958 struct nfs_commit_info *cinfo, 959 u32 ds_commit_idx) 960 961 { 962 struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg); 963 u32 i, j; 964 965 if (fl->commit_through_mds) { 966 nfs_request_add_commit_list(req, &cinfo->mds->list, cinfo); 967 } else { 968 /* Note that we are calling nfs4_fl_calc_j_index on each page 969 * that ends up being committed to a data server. An attractive 970 * alternative is to add a field to nfs_write_data and nfs_page 971 * to store the value calculated in filelayout_write_pagelist 972 * and just use that here. 973 */ 974 j = nfs4_fl_calc_j_index(lseg, req_offset(req)); 975 i = select_bucket_index(fl, j); 976 pnfs_layout_mark_request_commit(req, lseg, cinfo, i); 977 } 978 } 979 980 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i) 981 { 982 struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); 983 984 if (flseg->stripe_type == STRIPE_SPARSE) 985 return i; 986 else 987 return nfs4_fl_calc_ds_index(lseg, i); 988 } 989 990 static struct nfs_fh * 991 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i) 992 { 993 struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); 994 995 if (flseg->stripe_type == STRIPE_SPARSE) { 996 if (flseg->num_fh == 1) 997 i = 0; 998 else if (flseg->num_fh == 0) 999 /* Use the MDS OPEN fh set in nfs_read_rpcsetup */ 1000 return NULL; 1001 } 1002 return flseg->fh_array[i]; 1003 } 1004 1005 static int filelayout_initiate_commit(struct nfs_commit_data *data, int how) 1006 { 1007 struct pnfs_layout_segment *lseg = data->lseg; 1008 struct nfs4_pnfs_ds *ds; 1009 struct rpc_clnt *ds_clnt; 1010 u32 idx; 1011 struct nfs_fh *fh; 1012 1013 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index); 1014 ds = nfs4_fl_prepare_ds(lseg, idx); 1015 if (!ds) 1016 goto out_err; 1017 1018 ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, data->inode); 1019 if (IS_ERR(ds_clnt)) 1020 goto out_err; 1021 1022 dprintk("%s ino %lu, how %d cl_count %d\n", __func__, 1023 data->inode->i_ino, how, atomic_read(&ds->ds_clp->cl_count)); 1024 data->commit_done_cb = filelayout_commit_done_cb; 1025 atomic_inc(&ds->ds_clp->cl_count); 1026 data->ds_clp = ds->ds_clp; 1027 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index); 1028 if (fh) 1029 data->args.fh = fh; 1030 return nfs_initiate_commit(ds_clnt, data, NFS_PROTO(data->inode), 1031 &filelayout_commit_call_ops, how, 1032 RPC_TASK_SOFTCONN); 1033 out_err: 1034 pnfs_generic_prepare_to_resend_writes(data); 1035 pnfs_generic_commit_release(data); 1036 return -EAGAIN; 1037 } 1038 1039 /* filelayout_search_commit_reqs - Search lists in @cinfo for the head reqest 1040 * for @page 1041 * @cinfo - commit info for current inode 1042 * @page - page to search for matching head request 1043 * 1044 * Returns a the head request if one is found, otherwise returns NULL. 1045 */ 1046 static struct nfs_page * 1047 filelayout_search_commit_reqs(struct nfs_commit_info *cinfo, struct page *page) 1048 { 1049 struct nfs_page *freq, *t; 1050 struct pnfs_commit_bucket *b; 1051 int i; 1052 1053 /* Linearly search the commit lists for each bucket until a matching 1054 * request is found */ 1055 for (i = 0, b = cinfo->ds->buckets; i < cinfo->ds->nbuckets; i++, b++) { 1056 list_for_each_entry_safe(freq, t, &b->written, wb_list) { 1057 if (freq->wb_page == page) 1058 return freq->wb_head; 1059 } 1060 list_for_each_entry_safe(freq, t, &b->committing, wb_list) { 1061 if (freq->wb_page == page) 1062 return freq->wb_head; 1063 } 1064 } 1065 1066 return NULL; 1067 } 1068 1069 static int 1070 filelayout_commit_pagelist(struct inode *inode, struct list_head *mds_pages, 1071 int how, struct nfs_commit_info *cinfo) 1072 { 1073 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo, 1074 filelayout_initiate_commit); 1075 } 1076 1077 static struct nfs4_deviceid_node * 1078 filelayout_alloc_deviceid_node(struct nfs_server *server, 1079 struct pnfs_device *pdev, gfp_t gfp_flags) 1080 { 1081 struct nfs4_file_layout_dsaddr *dsaddr; 1082 1083 dsaddr = nfs4_fl_alloc_deviceid_node(server, pdev, gfp_flags); 1084 if (!dsaddr) 1085 return NULL; 1086 return &dsaddr->id_node; 1087 } 1088 1089 static void 1090 filelayout_free_deviceid_node(struct nfs4_deviceid_node *d) 1091 { 1092 nfs4_fl_free_deviceid(container_of(d, struct nfs4_file_layout_dsaddr, id_node)); 1093 } 1094 1095 static struct pnfs_layout_hdr * 1096 filelayout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags) 1097 { 1098 struct nfs4_filelayout *flo; 1099 1100 flo = kzalloc(sizeof(*flo), gfp_flags); 1101 return flo != NULL ? &flo->generic_hdr : NULL; 1102 } 1103 1104 static void 1105 filelayout_free_layout_hdr(struct pnfs_layout_hdr *lo) 1106 { 1107 kfree(FILELAYOUT_FROM_HDR(lo)); 1108 } 1109 1110 static struct pnfs_ds_commit_info * 1111 filelayout_get_ds_info(struct inode *inode) 1112 { 1113 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout; 1114 1115 if (layout == NULL) 1116 return NULL; 1117 else 1118 return &FILELAYOUT_FROM_HDR(layout)->commit_info; 1119 } 1120 1121 static struct pnfs_layoutdriver_type filelayout_type = { 1122 .id = LAYOUT_NFSV4_1_FILES, 1123 .name = "LAYOUT_NFSV4_1_FILES", 1124 .owner = THIS_MODULE, 1125 .alloc_layout_hdr = filelayout_alloc_layout_hdr, 1126 .free_layout_hdr = filelayout_free_layout_hdr, 1127 .alloc_lseg = filelayout_alloc_lseg, 1128 .free_lseg = filelayout_free_lseg, 1129 .pg_read_ops = &filelayout_pg_read_ops, 1130 .pg_write_ops = &filelayout_pg_write_ops, 1131 .get_ds_info = &filelayout_get_ds_info, 1132 .mark_request_commit = filelayout_mark_request_commit, 1133 .clear_request_commit = pnfs_generic_clear_request_commit, 1134 .scan_commit_lists = pnfs_generic_scan_commit_lists, 1135 .recover_commit_reqs = pnfs_generic_recover_commit_reqs, 1136 .search_commit_reqs = filelayout_search_commit_reqs, 1137 .commit_pagelist = filelayout_commit_pagelist, 1138 .read_pagelist = filelayout_read_pagelist, 1139 .write_pagelist = filelayout_write_pagelist, 1140 .alloc_deviceid_node = filelayout_alloc_deviceid_node, 1141 .free_deviceid_node = filelayout_free_deviceid_node, 1142 .sync = pnfs_nfs_generic_sync, 1143 }; 1144 1145 static int __init nfs4filelayout_init(void) 1146 { 1147 printk(KERN_INFO "%s: NFSv4 File Layout Driver Registering...\n", 1148 __func__); 1149 return pnfs_register_layoutdriver(&filelayout_type); 1150 } 1151 1152 static void __exit nfs4filelayout_exit(void) 1153 { 1154 printk(KERN_INFO "%s: NFSv4 File Layout Driver Unregistering...\n", 1155 __func__); 1156 pnfs_unregister_layoutdriver(&filelayout_type); 1157 } 1158 1159 MODULE_ALIAS("nfs-layouttype4-1"); 1160 1161 module_init(nfs4filelayout_init); 1162 module_exit(nfs4filelayout_exit); 1163