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#include <linux/backing-dev.h> 36 37#include <linux/sunrpc/metrics.h> 38 39#include "../nfs4session.h" 40#include "../internal.h" 41#include "../delegation.h" 42#include "filelayout.h" 43#include "../nfs4trace.h" 44 45#define NFSDBG_FACILITY NFSDBG_PNFS_LD 46 47MODULE_LICENSE("GPL"); 48MODULE_AUTHOR("Dean Hildebrand <dhildebz@umich.edu>"); 49MODULE_DESCRIPTION("The NFSv4 file layout driver"); 50 51#define FILELAYOUT_POLL_RETRY_MAX (15*HZ) 52static const struct pnfs_commit_ops filelayout_commit_ops; 53 54static loff_t 55filelayout_get_dense_offset(struct nfs4_filelayout_segment *flseg, 56 loff_t offset) 57{ 58 u32 stripe_width = flseg->stripe_unit * flseg->dsaddr->stripe_count; 59 u64 stripe_no; 60 u32 rem; 61 62 offset -= flseg->pattern_offset; 63 stripe_no = div_u64(offset, stripe_width); 64 div_u64_rem(offset, flseg->stripe_unit, &rem); 65 66 return stripe_no * flseg->stripe_unit + rem; 67} 68 69/* This function is used by the layout driver to calculate the 70 * offset of the file on the dserver based on whether the 71 * layout type is STRIPE_DENSE or STRIPE_SPARSE 72 */ 73static loff_t 74filelayout_get_dserver_offset(struct pnfs_layout_segment *lseg, loff_t offset) 75{ 76 struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); 77 78 switch (flseg->stripe_type) { 79 case STRIPE_SPARSE: 80 return offset; 81 82 case STRIPE_DENSE: 83 return filelayout_get_dense_offset(flseg, offset); 84 } 85 86 BUG(); 87} 88 89static void filelayout_reset_write(struct nfs_pgio_header *hdr) 90{ 91 struct rpc_task *task = &hdr->task; 92 93 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 94 dprintk("%s Reset task %5u for i/o through MDS " 95 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 96 hdr->task.tk_pid, 97 hdr->inode->i_sb->s_id, 98 (unsigned long long)NFS_FILEID(hdr->inode), 99 hdr->args.count, 100 (unsigned long long)hdr->args.offset); 101 102 task->tk_status = pnfs_write_done_resend_to_mds(hdr); 103 } 104} 105 106static void filelayout_reset_read(struct nfs_pgio_header *hdr) 107{ 108 struct rpc_task *task = &hdr->task; 109 110 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 111 dprintk("%s Reset task %5u for i/o through MDS " 112 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 113 hdr->task.tk_pid, 114 hdr->inode->i_sb->s_id, 115 (unsigned long long)NFS_FILEID(hdr->inode), 116 hdr->args.count, 117 (unsigned long long)hdr->args.offset); 118 119 task->tk_status = pnfs_read_done_resend_to_mds(hdr); 120 } 121} 122 123static int filelayout_async_handle_error(struct rpc_task *task, 124 struct nfs4_state *state, 125 struct nfs_client *clp, 126 struct pnfs_layout_segment *lseg) 127{ 128 struct pnfs_layout_hdr *lo = lseg->pls_layout; 129 struct inode *inode = lo->plh_inode; 130 struct nfs4_deviceid_node *devid = FILELAYOUT_DEVID_NODE(lseg); 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 /* DS session errors */ 138 case -NFS4ERR_BADSESSION: 139 case -NFS4ERR_BADSLOT: 140 case -NFS4ERR_BAD_HIGH_SLOT: 141 case -NFS4ERR_DEADSESSION: 142 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 143 case -NFS4ERR_SEQ_FALSE_RETRY: 144 case -NFS4ERR_SEQ_MISORDERED: 145 dprintk("%s ERROR %d, Reset session. Exchangeid " 146 "flags 0x%x\n", __func__, task->tk_status, 147 clp->cl_exchange_flags); 148 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status); 149 break; 150 case -NFS4ERR_DELAY: 151 case -NFS4ERR_GRACE: 152 rpc_delay(task, FILELAYOUT_POLL_RETRY_MAX); 153 break; 154 case -NFS4ERR_RETRY_UNCACHED_REP: 155 break; 156 /* Invalidate Layout errors */ 157 case -NFS4ERR_ACCESS: 158 case -NFS4ERR_PNFS_NO_LAYOUT: 159 case -ESTALE: /* mapped NFS4ERR_STALE */ 160 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */ 161 case -EISDIR: /* mapped NFS4ERR_ISDIR */ 162 case -NFS4ERR_FHEXPIRED: 163 case -NFS4ERR_WRONG_TYPE: 164 dprintk("%s Invalid layout error %d\n", __func__, 165 task->tk_status); 166 /* 167 * Destroy layout so new i/o will get a new layout. 168 * Layout will not be destroyed until all current lseg 169 * references are put. Mark layout as invalid to resend failed 170 * i/o and all i/o waiting on the slot table to the MDS until 171 * layout is destroyed and a new valid layout is obtained. 172 */ 173 pnfs_destroy_layout(NFS_I(inode)); 174 rpc_wake_up(&tbl->slot_tbl_waitq); 175 goto reset; 176 /* RPC connection errors */ 177 case -ECONNREFUSED: 178 case -EHOSTDOWN: 179 case -EHOSTUNREACH: 180 case -ENETUNREACH: 181 case -EIO: 182 case -ETIMEDOUT: 183 case -EPIPE: 184 case -EPROTO: 185 case -ENODEV: 186 dprintk("%s DS connection error %d\n", __func__, 187 task->tk_status); 188 nfs4_mark_deviceid_unavailable(devid); 189 pnfs_error_mark_layout_for_return(inode, lseg); 190 pnfs_set_lo_fail(lseg); 191 rpc_wake_up(&tbl->slot_tbl_waitq); 192 fallthrough; 193 default: 194reset: 195 dprintk("%s Retry through MDS. Error %d\n", __func__, 196 task->tk_status); 197 return -NFS4ERR_RESET_TO_MDS; 198 } 199 task->tk_status = 0; 200 return -EAGAIN; 201} 202 203/* NFS_PROTO call done callback routines */ 204 205static int filelayout_read_done_cb(struct rpc_task *task, 206 struct nfs_pgio_header *hdr) 207{ 208 int err; 209 210 trace_nfs4_pnfs_read(hdr, task->tk_status); 211 err = filelayout_async_handle_error(task, hdr->args.context->state, 212 hdr->ds_clp, hdr->lseg); 213 214 switch (err) { 215 case -NFS4ERR_RESET_TO_MDS: 216 filelayout_reset_read(hdr); 217 return task->tk_status; 218 case -EAGAIN: 219 rpc_restart_call_prepare(task); 220 return -EAGAIN; 221 } 222 223 return 0; 224} 225 226/* 227 * We reference the rpc_cred of the first WRITE that triggers the need for 228 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound. 229 * rfc5661 is not clear about which credential should be used. 230 */ 231static void 232filelayout_set_layoutcommit(struct nfs_pgio_header *hdr) 233{ 234 loff_t end_offs = 0; 235 236 if (FILELAYOUT_LSEG(hdr->lseg)->commit_through_mds || 237 hdr->res.verf->committed == NFS_FILE_SYNC) 238 return; 239 if (hdr->res.verf->committed == NFS_DATA_SYNC) 240 end_offs = hdr->mds_offset + (loff_t)hdr->res.count; 241 242 /* Note: if the write is unstable, don't set end_offs until commit */ 243 pnfs_set_layoutcommit(hdr->inode, hdr->lseg, end_offs); 244 dprintk("%s inode %lu pls_end_pos %lu\n", __func__, hdr->inode->i_ino, 245 (unsigned long) NFS_I(hdr->inode)->layout->plh_lwb); 246} 247 248bool 249filelayout_test_devid_unavailable(struct nfs4_deviceid_node *node) 250{ 251 return filelayout_test_devid_invalid(node) || 252 nfs4_test_deviceid_unavailable(node); 253} 254 255static bool 256filelayout_reset_to_mds(struct pnfs_layout_segment *lseg) 257{ 258 struct nfs4_deviceid_node *node = FILELAYOUT_DEVID_NODE(lseg); 259 260 return filelayout_test_devid_unavailable(node); 261} 262 263/* 264 * Call ops for the async read/write cases 265 * In the case of dense layouts, the offset needs to be reset to its 266 * original value. 267 */ 268static void filelayout_read_prepare(struct rpc_task *task, void *data) 269{ 270 struct nfs_pgio_header *hdr = data; 271 272 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 273 rpc_exit(task, -EIO); 274 return; 275 } 276 if (filelayout_reset_to_mds(hdr->lseg)) { 277 dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid); 278 filelayout_reset_read(hdr); 279 rpc_exit(task, 0); 280 return; 281 } 282 hdr->pgio_done_cb = filelayout_read_done_cb; 283 284 if (nfs4_setup_sequence(hdr->ds_clp, 285 &hdr->args.seq_args, 286 &hdr->res.seq_res, 287 task)) 288 return; 289 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 290 hdr->args.lock_context, FMODE_READ) == -EIO) 291 rpc_exit(task, -EIO); /* lost lock, terminate I/O */ 292} 293 294static void filelayout_read_call_done(struct rpc_task *task, void *data) 295{ 296 struct nfs_pgio_header *hdr = data; 297 298 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 299 task->tk_status == 0) { 300 nfs41_sequence_done(task, &hdr->res.seq_res); 301 return; 302 } 303 304 /* Note this may cause RPC to be resent */ 305 hdr->mds_ops->rpc_call_done(task, data); 306} 307 308static void filelayout_read_count_stats(struct rpc_task *task, void *data) 309{ 310 struct nfs_pgio_header *hdr = data; 311 312 rpc_count_iostats(task, NFS_SERVER(hdr->inode)->client->cl_metrics); 313} 314 315static int filelayout_write_done_cb(struct rpc_task *task, 316 struct nfs_pgio_header *hdr) 317{ 318 int err; 319 320 trace_nfs4_pnfs_write(hdr, task->tk_status); 321 err = filelayout_async_handle_error(task, hdr->args.context->state, 322 hdr->ds_clp, hdr->lseg); 323 324 switch (err) { 325 case -NFS4ERR_RESET_TO_MDS: 326 filelayout_reset_write(hdr); 327 return task->tk_status; 328 case -EAGAIN: 329 rpc_restart_call_prepare(task); 330 return -EAGAIN; 331 } 332 333 filelayout_set_layoutcommit(hdr); 334 335 /* zero out the fattr */ 336 hdr->fattr.valid = 0; 337 if (task->tk_status >= 0) 338 nfs_writeback_update_inode(hdr); 339 340 return 0; 341} 342 343static int filelayout_commit_done_cb(struct rpc_task *task, 344 struct nfs_commit_data *data) 345{ 346 int err; 347 348 trace_nfs4_pnfs_commit_ds(data, task->tk_status); 349 err = filelayout_async_handle_error(task, NULL, data->ds_clp, 350 data->lseg); 351 352 switch (err) { 353 case -NFS4ERR_RESET_TO_MDS: 354 pnfs_generic_prepare_to_resend_writes(data); 355 return -EAGAIN; 356 case -EAGAIN: 357 rpc_restart_call_prepare(task); 358 return -EAGAIN; 359 } 360 361 pnfs_set_layoutcommit(data->inode, data->lseg, data->lwb); 362 363 return 0; 364} 365 366static void filelayout_write_prepare(struct rpc_task *task, void *data) 367{ 368 struct nfs_pgio_header *hdr = data; 369 370 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 371 rpc_exit(task, -EIO); 372 return; 373 } 374 if (filelayout_reset_to_mds(hdr->lseg)) { 375 dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid); 376 filelayout_reset_write(hdr); 377 rpc_exit(task, 0); 378 return; 379 } 380 if (nfs4_setup_sequence(hdr->ds_clp, 381 &hdr->args.seq_args, 382 &hdr->res.seq_res, 383 task)) 384 return; 385 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 386 hdr->args.lock_context, FMODE_WRITE) == -EIO) 387 rpc_exit(task, -EIO); /* lost lock, terminate I/O */ 388} 389 390static void filelayout_write_call_done(struct rpc_task *task, void *data) 391{ 392 struct nfs_pgio_header *hdr = data; 393 394 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 395 task->tk_status == 0) { 396 nfs41_sequence_done(task, &hdr->res.seq_res); 397 return; 398 } 399 400 /* Note this may cause RPC to be resent */ 401 hdr->mds_ops->rpc_call_done(task, data); 402} 403 404static void filelayout_write_count_stats(struct rpc_task *task, void *data) 405{ 406 struct nfs_pgio_header *hdr = data; 407 408 rpc_count_iostats(task, NFS_SERVER(hdr->inode)->client->cl_metrics); 409} 410 411static void filelayout_commit_prepare(struct rpc_task *task, void *data) 412{ 413 struct nfs_commit_data *wdata = data; 414 415 nfs4_setup_sequence(wdata->ds_clp, 416 &wdata->args.seq_args, 417 &wdata->res.seq_res, 418 task); 419} 420 421static void filelayout_commit_count_stats(struct rpc_task *task, void *data) 422{ 423 struct nfs_commit_data *cdata = data; 424 425 rpc_count_iostats(task, NFS_SERVER(cdata->inode)->client->cl_metrics); 426} 427 428static const struct rpc_call_ops filelayout_read_call_ops = { 429 .rpc_call_prepare = filelayout_read_prepare, 430 .rpc_call_done = filelayout_read_call_done, 431 .rpc_count_stats = filelayout_read_count_stats, 432 .rpc_release = pnfs_generic_rw_release, 433}; 434 435static const struct rpc_call_ops filelayout_write_call_ops = { 436 .rpc_call_prepare = filelayout_write_prepare, 437 .rpc_call_done = filelayout_write_call_done, 438 .rpc_count_stats = filelayout_write_count_stats, 439 .rpc_release = pnfs_generic_rw_release, 440}; 441 442static const struct rpc_call_ops filelayout_commit_call_ops = { 443 .rpc_call_prepare = filelayout_commit_prepare, 444 .rpc_call_done = pnfs_generic_write_commit_done, 445 .rpc_count_stats = filelayout_commit_count_stats, 446 .rpc_release = pnfs_generic_commit_release, 447}; 448 449static enum pnfs_try_status 450filelayout_read_pagelist(struct nfs_pgio_header *hdr) 451{ 452 struct pnfs_layout_segment *lseg = hdr->lseg; 453 struct nfs4_pnfs_ds *ds; 454 struct rpc_clnt *ds_clnt; 455 loff_t offset = hdr->args.offset; 456 u32 j, idx; 457 struct nfs_fh *fh; 458 459 dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n", 460 __func__, hdr->inode->i_ino, 461 hdr->args.pgbase, (size_t)hdr->args.count, offset); 462 463 /* Retrieve the correct rpc_client for the byte range */ 464 j = nfs4_fl_calc_j_index(lseg, offset); 465 idx = nfs4_fl_calc_ds_index(lseg, j); 466 ds = nfs4_fl_prepare_ds(lseg, idx); 467 if (!ds) 468 return PNFS_NOT_ATTEMPTED; 469 470 ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, hdr->inode); 471 if (IS_ERR(ds_clnt)) 472 return PNFS_NOT_ATTEMPTED; 473 474 dprintk("%s USE DS: %s cl_count %d\n", __func__, 475 ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count)); 476 477 /* No multipath support. Use first DS */ 478 refcount_inc(&ds->ds_clp->cl_count); 479 hdr->ds_clp = ds->ds_clp; 480 hdr->ds_commit_idx = idx; 481 fh = nfs4_fl_select_ds_fh(lseg, j); 482 if (fh) 483 hdr->args.fh = fh; 484 485 hdr->args.offset = filelayout_get_dserver_offset(lseg, offset); 486 hdr->mds_offset = offset; 487 488 /* Perform an asynchronous read to ds */ 489 nfs_initiate_pgio(ds_clnt, hdr, hdr->cred, 490 NFS_PROTO(hdr->inode), &filelayout_read_call_ops, 491 0, RPC_TASK_SOFTCONN); 492 return PNFS_ATTEMPTED; 493} 494 495/* Perform async writes. */ 496static enum pnfs_try_status 497filelayout_write_pagelist(struct nfs_pgio_header *hdr, int sync) 498{ 499 struct pnfs_layout_segment *lseg = hdr->lseg; 500 struct nfs4_pnfs_ds *ds; 501 struct rpc_clnt *ds_clnt; 502 loff_t offset = hdr->args.offset; 503 u32 j, idx; 504 struct nfs_fh *fh; 505 506 /* Retrieve the correct rpc_client for the byte range */ 507 j = nfs4_fl_calc_j_index(lseg, offset); 508 idx = nfs4_fl_calc_ds_index(lseg, j); 509 ds = nfs4_fl_prepare_ds(lseg, idx); 510 if (!ds) 511 return PNFS_NOT_ATTEMPTED; 512 513 ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, hdr->inode); 514 if (IS_ERR(ds_clnt)) 515 return PNFS_NOT_ATTEMPTED; 516 517 dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d\n", 518 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count, 519 offset, ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count)); 520 521 hdr->pgio_done_cb = filelayout_write_done_cb; 522 refcount_inc(&ds->ds_clp->cl_count); 523 hdr->ds_clp = ds->ds_clp; 524 hdr->ds_commit_idx = idx; 525 fh = nfs4_fl_select_ds_fh(lseg, j); 526 if (fh) 527 hdr->args.fh = fh; 528 hdr->args.offset = filelayout_get_dserver_offset(lseg, offset); 529 530 /* Perform an asynchronous write */ 531 nfs_initiate_pgio(ds_clnt, hdr, hdr->cred, 532 NFS_PROTO(hdr->inode), &filelayout_write_call_ops, 533 sync, RPC_TASK_SOFTCONN); 534 return PNFS_ATTEMPTED; 535} 536 537static int 538filelayout_check_deviceid(struct pnfs_layout_hdr *lo, 539 struct nfs4_filelayout_segment *fl, 540 gfp_t gfp_flags) 541{ 542 struct nfs4_deviceid_node *d; 543 struct nfs4_file_layout_dsaddr *dsaddr; 544 int status = -EINVAL; 545 546 /* Is the deviceid already set? If so, we're good. */ 547 if (fl->dsaddr != NULL) 548 return 0; 549 550 /* find and reference the deviceid */ 551 d = nfs4_find_get_deviceid(NFS_SERVER(lo->plh_inode), &fl->deviceid, 552 lo->plh_lc_cred, gfp_flags); 553 if (d == NULL) 554 goto out; 555 556 dsaddr = container_of(d, struct nfs4_file_layout_dsaddr, id_node); 557 /* Found deviceid is unavailable */ 558 if (filelayout_test_devid_unavailable(&dsaddr->id_node)) 559 goto out_put; 560 561 if (fl->first_stripe_index >= dsaddr->stripe_count) { 562 dprintk("%s Bad first_stripe_index %u\n", 563 __func__, fl->first_stripe_index); 564 goto out_put; 565 } 566 567 if ((fl->stripe_type == STRIPE_SPARSE && 568 fl->num_fh > 1 && fl->num_fh != dsaddr->ds_num) || 569 (fl->stripe_type == STRIPE_DENSE && 570 fl->num_fh != dsaddr->stripe_count)) { 571 dprintk("%s num_fh %u not valid for given packing\n", 572 __func__, fl->num_fh); 573 goto out_put; 574 } 575 status = 0; 576 577 /* 578 * Atomic compare and xchange to ensure we don't scribble 579 * over a non-NULL pointer. 580 */ 581 if (cmpxchg(&fl->dsaddr, NULL, dsaddr) != NULL) 582 goto out_put; 583out: 584 return status; 585out_put: 586 nfs4_fl_put_deviceid(dsaddr); 587 goto out; 588} 589 590/* 591 * filelayout_check_layout() 592 * 593 * Make sure layout segment parameters are sane WRT the device. 594 * At this point no generic layer initialization of the lseg has occurred, 595 * and nothing has been added to the layout_hdr cache. 596 * 597 */ 598static int 599filelayout_check_layout(struct pnfs_layout_hdr *lo, 600 struct nfs4_filelayout_segment *fl, 601 struct nfs4_layoutget_res *lgr, 602 gfp_t gfp_flags) 603{ 604 int status = -EINVAL; 605 606 dprintk("--> %s\n", __func__); 607 608 /* FIXME: remove this check when layout segment support is added */ 609 if (lgr->range.offset != 0 || 610 lgr->range.length != NFS4_MAX_UINT64) { 611 dprintk("%s Only whole file layouts supported. Use MDS i/o\n", 612 __func__); 613 goto out; 614 } 615 616 if (fl->pattern_offset > lgr->range.offset) { 617 dprintk("%s pattern_offset %lld too large\n", 618 __func__, fl->pattern_offset); 619 goto out; 620 } 621 622 if (!fl->stripe_unit) { 623 dprintk("%s Invalid stripe unit (%u)\n", 624 __func__, fl->stripe_unit); 625 goto out; 626 } 627 628 status = 0; 629out: 630 dprintk("--> %s returns %d\n", __func__, status); 631 return status; 632} 633 634static void _filelayout_free_lseg(struct nfs4_filelayout_segment *fl) 635{ 636 int i; 637 638 if (fl->fh_array) { 639 for (i = 0; i < fl->num_fh; i++) { 640 if (!fl->fh_array[i]) 641 break; 642 kfree(fl->fh_array[i]); 643 } 644 kfree(fl->fh_array); 645 } 646 kfree(fl); 647} 648 649static int 650filelayout_decode_layout(struct pnfs_layout_hdr *flo, 651 struct nfs4_filelayout_segment *fl, 652 struct nfs4_layoutget_res *lgr, 653 gfp_t gfp_flags) 654{ 655 struct xdr_stream stream; 656 struct xdr_buf buf; 657 struct page *scratch; 658 __be32 *p; 659 uint32_t nfl_util; 660 int i; 661 662 dprintk("%s: set_layout_map Begin\n", __func__); 663 664 scratch = alloc_page(gfp_flags); 665 if (!scratch) 666 return -ENOMEM; 667 668 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages, lgr->layoutp->len); 669 xdr_set_scratch_page(&stream, scratch); 670 671 /* 20 = ufl_util (4), first_stripe_index (4), pattern_offset (8), 672 * num_fh (4) */ 673 p = xdr_inline_decode(&stream, NFS4_DEVICEID4_SIZE + 20); 674 if (unlikely(!p)) 675 goto out_err; 676 677 memcpy(&fl->deviceid, p, sizeof(fl->deviceid)); 678 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE); 679 nfs4_print_deviceid(&fl->deviceid); 680 681 nfl_util = be32_to_cpup(p++); 682 if (nfl_util & NFL4_UFLG_COMMIT_THRU_MDS) 683 fl->commit_through_mds = 1; 684 if (nfl_util & NFL4_UFLG_DENSE) 685 fl->stripe_type = STRIPE_DENSE; 686 else 687 fl->stripe_type = STRIPE_SPARSE; 688 fl->stripe_unit = nfl_util & ~NFL4_UFLG_MASK; 689 690 fl->first_stripe_index = be32_to_cpup(p++); 691 p = xdr_decode_hyper(p, &fl->pattern_offset); 692 fl->num_fh = be32_to_cpup(p++); 693 694 dprintk("%s: nfl_util 0x%X num_fh %u fsi %u po %llu\n", 695 __func__, nfl_util, fl->num_fh, fl->first_stripe_index, 696 fl->pattern_offset); 697 698 /* Note that a zero value for num_fh is legal for STRIPE_SPARSE. 699 * Futher checking is done in filelayout_check_layout */ 700 if (fl->num_fh > 701 max(NFS4_PNFS_MAX_STRIPE_CNT, NFS4_PNFS_MAX_MULTI_CNT)) 702 goto out_err; 703 704 if (fl->num_fh > 0) { 705 fl->fh_array = kcalloc(fl->num_fh, sizeof(fl->fh_array[0]), 706 gfp_flags); 707 if (!fl->fh_array) 708 goto out_err; 709 } 710 711 for (i = 0; i < fl->num_fh; i++) { 712 /* Do we want to use a mempool here? */ 713 fl->fh_array[i] = kmalloc(sizeof(struct nfs_fh), gfp_flags); 714 if (!fl->fh_array[i]) 715 goto out_err; 716 717 p = xdr_inline_decode(&stream, 4); 718 if (unlikely(!p)) 719 goto out_err; 720 fl->fh_array[i]->size = be32_to_cpup(p++); 721 if (fl->fh_array[i]->size > NFS_MAXFHSIZE) { 722 printk(KERN_ERR "NFS: Too big fh %d received %d\n", 723 i, fl->fh_array[i]->size); 724 goto out_err; 725 } 726 727 p = xdr_inline_decode(&stream, fl->fh_array[i]->size); 728 if (unlikely(!p)) 729 goto out_err; 730 memcpy(fl->fh_array[i]->data, p, fl->fh_array[i]->size); 731 dprintk("DEBUG: %s: fh len %d\n", __func__, 732 fl->fh_array[i]->size); 733 } 734 735 __free_page(scratch); 736 return 0; 737 738out_err: 739 __free_page(scratch); 740 return -EIO; 741} 742 743static void 744filelayout_free_lseg(struct pnfs_layout_segment *lseg) 745{ 746 struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg); 747 748 dprintk("--> %s\n", __func__); 749 if (fl->dsaddr != NULL) 750 nfs4_fl_put_deviceid(fl->dsaddr); 751 /* This assumes a single RW lseg */ 752 if (lseg->pls_range.iomode == IOMODE_RW) { 753 struct nfs4_filelayout *flo; 754 struct inode *inode; 755 756 flo = FILELAYOUT_FROM_HDR(lseg->pls_layout); 757 inode = flo->generic_hdr.plh_inode; 758 spin_lock(&inode->i_lock); 759 pnfs_generic_ds_cinfo_release_lseg(&flo->commit_info, lseg); 760 spin_unlock(&inode->i_lock); 761 } 762 _filelayout_free_lseg(fl); 763} 764 765static struct pnfs_layout_segment * 766filelayout_alloc_lseg(struct pnfs_layout_hdr *layoutid, 767 struct nfs4_layoutget_res *lgr, 768 gfp_t gfp_flags) 769{ 770 struct nfs4_filelayout_segment *fl; 771 int rc; 772 773 dprintk("--> %s\n", __func__); 774 fl = kzalloc(sizeof(*fl), gfp_flags); 775 if (!fl) 776 return NULL; 777 778 rc = filelayout_decode_layout(layoutid, fl, lgr, gfp_flags); 779 if (rc != 0 || filelayout_check_layout(layoutid, fl, lgr, gfp_flags)) { 780 _filelayout_free_lseg(fl); 781 return NULL; 782 } 783 return &fl->generic_hdr; 784} 785 786static bool 787filelayout_lseg_is_striped(const struct nfs4_filelayout_segment *flseg) 788{ 789 return flseg->num_fh > 1; 790} 791 792/* 793 * filelayout_pg_test(). Called by nfs_can_coalesce_requests() 794 * 795 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number 796 * of bytes (maximum @req->wb_bytes) that can be coalesced. 797 */ 798static size_t 799filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, 800 struct nfs_page *req) 801{ 802 unsigned int size; 803 u64 p_stripe, r_stripe; 804 u32 stripe_offset; 805 u64 segment_offset = pgio->pg_lseg->pls_range.offset; 806 u32 stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit; 807 808 /* calls nfs_generic_pg_test */ 809 size = pnfs_generic_pg_test(pgio, prev, req); 810 if (!size) 811 return 0; 812 else if (!filelayout_lseg_is_striped(FILELAYOUT_LSEG(pgio->pg_lseg))) 813 return size; 814 815 /* see if req and prev are in the same stripe */ 816 if (prev) { 817 p_stripe = (u64)req_offset(prev) - segment_offset; 818 r_stripe = (u64)req_offset(req) - segment_offset; 819 do_div(p_stripe, stripe_unit); 820 do_div(r_stripe, stripe_unit); 821 822 if (p_stripe != r_stripe) 823 return 0; 824 } 825 826 /* calculate remaining bytes in the current stripe */ 827 div_u64_rem((u64)req_offset(req) - segment_offset, 828 stripe_unit, 829 &stripe_offset); 830 WARN_ON_ONCE(stripe_offset > stripe_unit); 831 if (stripe_offset >= stripe_unit) 832 return 0; 833 return min(stripe_unit - (unsigned int)stripe_offset, size); 834} 835 836static struct pnfs_layout_segment * 837fl_pnfs_update_layout(struct inode *ino, 838 struct nfs_open_context *ctx, 839 loff_t pos, 840 u64 count, 841 enum pnfs_iomode iomode, 842 bool strict_iomode, 843 gfp_t gfp_flags) 844{ 845 struct pnfs_layout_segment *lseg = NULL; 846 struct pnfs_layout_hdr *lo; 847 struct nfs4_filelayout_segment *fl; 848 int status; 849 850 lseg = pnfs_update_layout(ino, ctx, pos, count, iomode, strict_iomode, 851 gfp_flags); 852 if (IS_ERR(lseg)) { 853 /* Fall back to MDS on recoverable errors */ 854 if (!nfs_error_is_fatal_on_server(PTR_ERR(lseg))) 855 lseg = NULL; 856 goto out; 857 } else if (!lseg) 858 goto out; 859 860 lo = NFS_I(ino)->layout; 861 fl = FILELAYOUT_LSEG(lseg); 862 863 status = filelayout_check_deviceid(lo, fl, gfp_flags); 864 if (status) { 865 pnfs_error_mark_layout_for_return(ino, lseg); 866 pnfs_set_lo_fail(lseg); 867 pnfs_put_lseg(lseg); 868 lseg = NULL; 869 } 870out: 871 return lseg; 872} 873 874static void 875filelayout_pg_init_read(struct nfs_pageio_descriptor *pgio, 876 struct nfs_page *req) 877{ 878 pnfs_generic_pg_check_layout(pgio); 879 if (!pgio->pg_lseg) { 880 pgio->pg_lseg = fl_pnfs_update_layout(pgio->pg_inode, 881 nfs_req_openctx(req), 882 0, 883 NFS4_MAX_UINT64, 884 IOMODE_READ, 885 false, 886 GFP_KERNEL); 887 if (IS_ERR(pgio->pg_lseg)) { 888 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 889 pgio->pg_lseg = NULL; 890 return; 891 } 892 } 893 /* If no lseg, fall back to read through mds */ 894 if (pgio->pg_lseg == NULL) 895 nfs_pageio_reset_read_mds(pgio); 896} 897 898static void 899filelayout_pg_init_write(struct nfs_pageio_descriptor *pgio, 900 struct nfs_page *req) 901{ 902 pnfs_generic_pg_check_layout(pgio); 903 if (!pgio->pg_lseg) { 904 pgio->pg_lseg = fl_pnfs_update_layout(pgio->pg_inode, 905 nfs_req_openctx(req), 906 0, 907 NFS4_MAX_UINT64, 908 IOMODE_RW, 909 false, 910 GFP_NOFS); 911 if (IS_ERR(pgio->pg_lseg)) { 912 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 913 pgio->pg_lseg = NULL; 914 return; 915 } 916 } 917 918 /* If no lseg, fall back to write through mds */ 919 if (pgio->pg_lseg == NULL) 920 nfs_pageio_reset_write_mds(pgio); 921} 922 923static const struct nfs_pageio_ops filelayout_pg_read_ops = { 924 .pg_init = filelayout_pg_init_read, 925 .pg_test = filelayout_pg_test, 926 .pg_doio = pnfs_generic_pg_readpages, 927 .pg_cleanup = pnfs_generic_pg_cleanup, 928}; 929 930static const struct nfs_pageio_ops filelayout_pg_write_ops = { 931 .pg_init = filelayout_pg_init_write, 932 .pg_test = filelayout_pg_test, 933 .pg_doio = pnfs_generic_pg_writepages, 934 .pg_cleanup = pnfs_generic_pg_cleanup, 935}; 936 937static u32 select_bucket_index(struct nfs4_filelayout_segment *fl, u32 j) 938{ 939 if (fl->stripe_type == STRIPE_SPARSE) 940 return nfs4_fl_calc_ds_index(&fl->generic_hdr, j); 941 else 942 return j; 943} 944 945static void 946filelayout_mark_request_commit(struct nfs_page *req, 947 struct pnfs_layout_segment *lseg, 948 struct nfs_commit_info *cinfo, 949 u32 ds_commit_idx) 950 951{ 952 struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg); 953 u32 i, j; 954 955 if (fl->commit_through_mds) { 956 nfs_request_add_commit_list(req, cinfo); 957 } else { 958 /* Note that we are calling nfs4_fl_calc_j_index on each page 959 * that ends up being committed to a data server. An attractive 960 * alternative is to add a field to nfs_write_data and nfs_page 961 * to store the value calculated in filelayout_write_pagelist 962 * and just use that here. 963 */ 964 j = nfs4_fl_calc_j_index(lseg, req_offset(req)); 965 i = select_bucket_index(fl, j); 966 pnfs_layout_mark_request_commit(req, lseg, cinfo, i); 967 } 968} 969 970static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i) 971{ 972 struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); 973 974 if (flseg->stripe_type == STRIPE_SPARSE) 975 return i; 976 else 977 return nfs4_fl_calc_ds_index(lseg, i); 978} 979 980static struct nfs_fh * 981select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i) 982{ 983 struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); 984 985 if (flseg->stripe_type == STRIPE_SPARSE) { 986 if (flseg->num_fh == 1) 987 i = 0; 988 else if (flseg->num_fh == 0) 989 /* Use the MDS OPEN fh set in nfs_read_rpcsetup */ 990 return NULL; 991 } 992 return flseg->fh_array[i]; 993} 994 995static int filelayout_initiate_commit(struct nfs_commit_data *data, int how) 996{ 997 struct pnfs_layout_segment *lseg = data->lseg; 998 struct nfs4_pnfs_ds *ds; 999 struct rpc_clnt *ds_clnt; 1000 u32 idx; 1001 struct nfs_fh *fh; 1002 1003 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index); 1004 ds = nfs4_fl_prepare_ds(lseg, idx); 1005 if (!ds) 1006 goto out_err; 1007 1008 ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, data->inode); 1009 if (IS_ERR(ds_clnt)) 1010 goto out_err; 1011 1012 dprintk("%s ino %lu, how %d cl_count %d\n", __func__, 1013 data->inode->i_ino, how, refcount_read(&ds->ds_clp->cl_count)); 1014 data->commit_done_cb = filelayout_commit_done_cb; 1015 refcount_inc(&ds->ds_clp->cl_count); 1016 data->ds_clp = ds->ds_clp; 1017 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index); 1018 if (fh) 1019 data->args.fh = fh; 1020 return nfs_initiate_commit(ds_clnt, data, NFS_PROTO(data->inode), 1021 &filelayout_commit_call_ops, how, 1022 RPC_TASK_SOFTCONN); 1023out_err: 1024 pnfs_generic_prepare_to_resend_writes(data); 1025 pnfs_generic_commit_release(data); 1026 return -EAGAIN; 1027} 1028 1029static int 1030filelayout_commit_pagelist(struct inode *inode, struct list_head *mds_pages, 1031 int how, struct nfs_commit_info *cinfo) 1032{ 1033 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo, 1034 filelayout_initiate_commit); 1035} 1036 1037static struct nfs4_deviceid_node * 1038filelayout_alloc_deviceid_node(struct nfs_server *server, 1039 struct pnfs_device *pdev, gfp_t gfp_flags) 1040{ 1041 struct nfs4_file_layout_dsaddr *dsaddr; 1042 1043 dsaddr = nfs4_fl_alloc_deviceid_node(server, pdev, gfp_flags); 1044 if (!dsaddr) 1045 return NULL; 1046 return &dsaddr->id_node; 1047} 1048 1049static void 1050filelayout_free_deviceid_node(struct nfs4_deviceid_node *d) 1051{ 1052 nfs4_fl_free_deviceid(container_of(d, struct nfs4_file_layout_dsaddr, id_node)); 1053} 1054 1055static struct pnfs_layout_hdr * 1056filelayout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags) 1057{ 1058 struct nfs4_filelayout *flo; 1059 1060 flo = kzalloc(sizeof(*flo), gfp_flags); 1061 if (flo == NULL) 1062 return NULL; 1063 pnfs_init_ds_commit_info(&flo->commit_info); 1064 flo->commit_info.ops = &filelayout_commit_ops; 1065 return &flo->generic_hdr; 1066} 1067 1068static void 1069filelayout_free_layout_hdr(struct pnfs_layout_hdr *lo) 1070{ 1071 kfree_rcu(FILELAYOUT_FROM_HDR(lo), generic_hdr.plh_rcu); 1072} 1073 1074static struct pnfs_ds_commit_info * 1075filelayout_get_ds_info(struct inode *inode) 1076{ 1077 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout; 1078 1079 if (layout == NULL) 1080 return NULL; 1081 else 1082 return &FILELAYOUT_FROM_HDR(layout)->commit_info; 1083} 1084 1085static void 1086filelayout_setup_ds_info(struct pnfs_ds_commit_info *fl_cinfo, 1087 struct pnfs_layout_segment *lseg) 1088{ 1089 struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg); 1090 struct inode *inode = lseg->pls_layout->plh_inode; 1091 struct pnfs_commit_array *array, *new; 1092 unsigned int size = (fl->stripe_type == STRIPE_SPARSE) ? 1093 fl->dsaddr->ds_num : fl->dsaddr->stripe_count; 1094 1095 new = pnfs_alloc_commit_array(size, nfs_io_gfp_mask()); 1096 if (new) { 1097 spin_lock(&inode->i_lock); 1098 array = pnfs_add_commit_array(fl_cinfo, new, lseg); 1099 spin_unlock(&inode->i_lock); 1100 if (array != new) 1101 pnfs_free_commit_array(new); 1102 } 1103} 1104 1105static void 1106filelayout_release_ds_info(struct pnfs_ds_commit_info *fl_cinfo, 1107 struct inode *inode) 1108{ 1109 spin_lock(&inode->i_lock); 1110 pnfs_generic_ds_cinfo_destroy(fl_cinfo); 1111 spin_unlock(&inode->i_lock); 1112} 1113 1114static const struct pnfs_commit_ops filelayout_commit_ops = { 1115 .setup_ds_info = filelayout_setup_ds_info, 1116 .release_ds_info = filelayout_release_ds_info, 1117 .mark_request_commit = filelayout_mark_request_commit, 1118 .clear_request_commit = pnfs_generic_clear_request_commit, 1119 .scan_commit_lists = pnfs_generic_scan_commit_lists, 1120 .recover_commit_reqs = pnfs_generic_recover_commit_reqs, 1121 .search_commit_reqs = pnfs_generic_search_commit_reqs, 1122 .commit_pagelist = filelayout_commit_pagelist, 1123}; 1124 1125static struct pnfs_layoutdriver_type filelayout_type = { 1126 .id = LAYOUT_NFSV4_1_FILES, 1127 .name = "LAYOUT_NFSV4_1_FILES", 1128 .owner = THIS_MODULE, 1129 .flags = PNFS_LAYOUTGET_ON_OPEN, 1130 .max_layoutget_response = 4096, /* 1 page or so... */ 1131 .alloc_layout_hdr = filelayout_alloc_layout_hdr, 1132 .free_layout_hdr = filelayout_free_layout_hdr, 1133 .alloc_lseg = filelayout_alloc_lseg, 1134 .free_lseg = filelayout_free_lseg, 1135 .pg_read_ops = &filelayout_pg_read_ops, 1136 .pg_write_ops = &filelayout_pg_write_ops, 1137 .get_ds_info = &filelayout_get_ds_info, 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 1145static 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 1152static 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 1159MODULE_ALIAS("nfs-layouttype4-1"); 1160 1161module_init(nfs4filelayout_init); 1162module_exit(nfs4filelayout_exit); 1163