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 47 MODULE_LICENSE("GPL"); 48 MODULE_AUTHOR("Dean Hildebrand <dhildebz@umich.edu>"); 49 MODULE_DESCRIPTION("The NFSv4 file layout driver"); 50 51 #define FILELAYOUT_POLL_RETRY_MAX (15*HZ) 52 53 static loff_t 54 filelayout_get_dense_offset(struct nfs4_filelayout_segment *flseg, 55 loff_t offset) 56 { 57 u32 stripe_width = flseg->stripe_unit * flseg->dsaddr->stripe_count; 58 u64 stripe_no; 59 u32 rem; 60 61 offset -= flseg->pattern_offset; 62 stripe_no = div_u64(offset, stripe_width); 63 div_u64_rem(offset, flseg->stripe_unit, &rem); 64 65 return stripe_no * flseg->stripe_unit + rem; 66 } 67 68 /* This function is used by the layout driver to calculate the 69 * offset of the file on the dserver based on whether the 70 * layout type is STRIPE_DENSE or STRIPE_SPARSE 71 */ 72 static loff_t 73 filelayout_get_dserver_offset(struct pnfs_layout_segment *lseg, loff_t offset) 74 { 75 struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); 76 77 switch (flseg->stripe_type) { 78 case STRIPE_SPARSE: 79 return offset; 80 81 case STRIPE_DENSE: 82 return filelayout_get_dense_offset(flseg, offset); 83 } 84 85 BUG(); 86 } 87 88 static void filelayout_reset_write(struct nfs_pgio_header *hdr) 89 { 90 struct rpc_task *task = &hdr->task; 91 92 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 93 dprintk("%s Reset task %5u for i/o through MDS " 94 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 95 hdr->task.tk_pid, 96 hdr->inode->i_sb->s_id, 97 (unsigned long long)NFS_FILEID(hdr->inode), 98 hdr->args.count, 99 (unsigned long long)hdr->args.offset); 100 101 task->tk_status = pnfs_write_done_resend_to_mds(hdr); 102 } 103 } 104 105 static void filelayout_reset_read(struct nfs_pgio_header *hdr) 106 { 107 struct rpc_task *task = &hdr->task; 108 109 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 110 dprintk("%s Reset task %5u for i/o through MDS " 111 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 112 hdr->task.tk_pid, 113 hdr->inode->i_sb->s_id, 114 (unsigned long long)NFS_FILEID(hdr->inode), 115 hdr->args.count, 116 (unsigned long long)hdr->args.offset); 117 118 task->tk_status = pnfs_read_done_resend_to_mds(hdr); 119 } 120 } 121 122 static int filelayout_async_handle_error(struct rpc_task *task, 123 struct nfs4_state *state, 124 struct nfs_client *clp, 125 struct pnfs_layout_segment *lseg) 126 { 127 struct pnfs_layout_hdr *lo = lseg->pls_layout; 128 struct inode *inode = lo->plh_inode; 129 struct nfs4_deviceid_node *devid = FILELAYOUT_DEVID_NODE(lseg); 130 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table; 131 132 if (task->tk_status >= 0) 133 return 0; 134 135 switch (task->tk_status) { 136 /* DS session errors */ 137 case -NFS4ERR_BADSESSION: 138 case -NFS4ERR_BADSLOT: 139 case -NFS4ERR_BAD_HIGH_SLOT: 140 case -NFS4ERR_DEADSESSION: 141 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 142 case -NFS4ERR_SEQ_FALSE_RETRY: 143 case -NFS4ERR_SEQ_MISORDERED: 144 dprintk("%s ERROR %d, Reset session. Exchangeid " 145 "flags 0x%x\n", __func__, task->tk_status, 146 clp->cl_exchange_flags); 147 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status); 148 break; 149 case -NFS4ERR_DELAY: 150 case -NFS4ERR_GRACE: 151 rpc_delay(task, FILELAYOUT_POLL_RETRY_MAX); 152 break; 153 case -NFS4ERR_RETRY_UNCACHED_REP: 154 break; 155 /* Invalidate Layout errors */ 156 case -NFS4ERR_ACCESS: 157 case -NFS4ERR_PNFS_NO_LAYOUT: 158 case -ESTALE: /* mapped NFS4ERR_STALE */ 159 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */ 160 case -EISDIR: /* mapped NFS4ERR_ISDIR */ 161 case -NFS4ERR_FHEXPIRED: 162 case -NFS4ERR_WRONG_TYPE: 163 dprintk("%s Invalid layout error %d\n", __func__, 164 task->tk_status); 165 /* 166 * Destroy layout so new i/o will get a new layout. 167 * Layout will not be destroyed until all current lseg 168 * references are put. Mark layout as invalid to resend failed 169 * i/o and all i/o waiting on the slot table to the MDS until 170 * layout is destroyed and a new valid layout is obtained. 171 */ 172 pnfs_destroy_layout(NFS_I(inode)); 173 rpc_wake_up(&tbl->slot_tbl_waitq); 174 goto reset; 175 /* RPC connection errors */ 176 case -ECONNREFUSED: 177 case -EHOSTDOWN: 178 case -EHOSTUNREACH: 179 case -ENETUNREACH: 180 case -EIO: 181 case -ETIMEDOUT: 182 case -EPIPE: 183 dprintk("%s DS connection error %d\n", __func__, 184 task->tk_status); 185 nfs4_mark_deviceid_unavailable(devid); 186 pnfs_error_mark_layout_for_return(inode, lseg); 187 pnfs_set_lo_fail(lseg); 188 rpc_wake_up(&tbl->slot_tbl_waitq); 189 /* fall through */ 190 default: 191 reset: 192 dprintk("%s Retry through MDS. Error %d\n", __func__, 193 task->tk_status); 194 return -NFS4ERR_RESET_TO_MDS; 195 } 196 task->tk_status = 0; 197 return -EAGAIN; 198 } 199 200 /* NFS_PROTO call done callback routines */ 201 202 static int filelayout_read_done_cb(struct rpc_task *task, 203 struct nfs_pgio_header *hdr) 204 { 205 int err; 206 207 trace_nfs4_pnfs_read(hdr, task->tk_status); 208 err = filelayout_async_handle_error(task, hdr->args.context->state, 209 hdr->ds_clp, hdr->lseg); 210 211 switch (err) { 212 case -NFS4ERR_RESET_TO_MDS: 213 filelayout_reset_read(hdr); 214 return task->tk_status; 215 case -EAGAIN: 216 rpc_restart_call_prepare(task); 217 return -EAGAIN; 218 } 219 220 return 0; 221 } 222 223 /* 224 * We reference the rpc_cred of the first WRITE that triggers the need for 225 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound. 226 * rfc5661 is not clear about which credential should be used. 227 */ 228 static void 229 filelayout_set_layoutcommit(struct nfs_pgio_header *hdr) 230 { 231 loff_t end_offs = 0; 232 233 if (FILELAYOUT_LSEG(hdr->lseg)->commit_through_mds || 234 hdr->res.verf->committed == NFS_FILE_SYNC) 235 return; 236 if (hdr->res.verf->committed == NFS_DATA_SYNC) 237 end_offs = hdr->mds_offset + (loff_t)hdr->res.count; 238 239 /* Note: if the write is unstable, don't set end_offs until commit */ 240 pnfs_set_layoutcommit(hdr->inode, hdr->lseg, end_offs); 241 dprintk("%s inode %lu pls_end_pos %lu\n", __func__, hdr->inode->i_ino, 242 (unsigned long) NFS_I(hdr->inode)->layout->plh_lwb); 243 } 244 245 bool 246 filelayout_test_devid_unavailable(struct nfs4_deviceid_node *node) 247 { 248 return filelayout_test_devid_invalid(node) || 249 nfs4_test_deviceid_unavailable(node); 250 } 251 252 static bool 253 filelayout_reset_to_mds(struct pnfs_layout_segment *lseg) 254 { 255 struct nfs4_deviceid_node *node = FILELAYOUT_DEVID_NODE(lseg); 256 257 return filelayout_test_devid_unavailable(node); 258 } 259 260 /* 261 * Call ops for the async read/write cases 262 * In the case of dense layouts, the offset needs to be reset to its 263 * original value. 264 */ 265 static void filelayout_read_prepare(struct rpc_task *task, void *data) 266 { 267 struct nfs_pgio_header *hdr = data; 268 269 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 270 rpc_exit(task, -EIO); 271 return; 272 } 273 if (filelayout_reset_to_mds(hdr->lseg)) { 274 dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid); 275 filelayout_reset_read(hdr); 276 rpc_exit(task, 0); 277 return; 278 } 279 hdr->pgio_done_cb = filelayout_read_done_cb; 280 281 if (nfs4_setup_sequence(hdr->ds_clp, 282 &hdr->args.seq_args, 283 &hdr->res.seq_res, 284 task)) 285 return; 286 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 287 hdr->args.lock_context, FMODE_READ) == -EIO) 288 rpc_exit(task, -EIO); /* lost lock, terminate I/O */ 289 } 290 291 static void filelayout_read_call_done(struct rpc_task *task, void *data) 292 { 293 struct nfs_pgio_header *hdr = data; 294 295 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status); 296 297 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 298 task->tk_status == 0) { 299 nfs41_sequence_done(task, &hdr->res.seq_res); 300 return; 301 } 302 303 /* Note this may cause RPC to be resent */ 304 hdr->mds_ops->rpc_call_done(task, data); 305 } 306 307 static void filelayout_read_count_stats(struct rpc_task *task, void *data) 308 { 309 struct nfs_pgio_header *hdr = data; 310 311 rpc_count_iostats(task, NFS_SERVER(hdr->inode)->client->cl_metrics); 312 } 313 314 static int filelayout_write_done_cb(struct rpc_task *task, 315 struct nfs_pgio_header *hdr) 316 { 317 int err; 318 319 trace_nfs4_pnfs_write(hdr, task->tk_status); 320 err = filelayout_async_handle_error(task, hdr->args.context->state, 321 hdr->ds_clp, hdr->lseg); 322 323 switch (err) { 324 case -NFS4ERR_RESET_TO_MDS: 325 filelayout_reset_write(hdr); 326 return task->tk_status; 327 case -EAGAIN: 328 rpc_restart_call_prepare(task); 329 return -EAGAIN; 330 } 331 332 filelayout_set_layoutcommit(hdr); 333 334 /* zero out the fattr */ 335 hdr->fattr.valid = 0; 336 if (task->tk_status >= 0) 337 nfs_writeback_update_inode(hdr); 338 339 return 0; 340 } 341 342 static int filelayout_commit_done_cb(struct rpc_task *task, 343 struct nfs_commit_data *data) 344 { 345 int err; 346 347 trace_nfs4_pnfs_commit_ds(data, task->tk_status); 348 err = filelayout_async_handle_error(task, NULL, data->ds_clp, 349 data->lseg); 350 351 switch (err) { 352 case -NFS4ERR_RESET_TO_MDS: 353 pnfs_generic_prepare_to_resend_writes(data); 354 return -EAGAIN; 355 case -EAGAIN: 356 rpc_restart_call_prepare(task); 357 return -EAGAIN; 358 } 359 360 pnfs_set_layoutcommit(data->inode, data->lseg, data->lwb); 361 362 return 0; 363 } 364 365 static void filelayout_write_prepare(struct rpc_task *task, void *data) 366 { 367 struct nfs_pgio_header *hdr = data; 368 369 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 370 rpc_exit(task, -EIO); 371 return; 372 } 373 if (filelayout_reset_to_mds(hdr->lseg)) { 374 dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid); 375 filelayout_reset_write(hdr); 376 rpc_exit(task, 0); 377 return; 378 } 379 if (nfs4_setup_sequence(hdr->ds_clp, 380 &hdr->args.seq_args, 381 &hdr->res.seq_res, 382 task)) 383 return; 384 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 385 hdr->args.lock_context, FMODE_WRITE) == -EIO) 386 rpc_exit(task, -EIO); /* lost lock, terminate I/O */ 387 } 388 389 static void filelayout_write_call_done(struct rpc_task *task, void *data) 390 { 391 struct nfs_pgio_header *hdr = data; 392 393 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 394 task->tk_status == 0) { 395 nfs41_sequence_done(task, &hdr->res.seq_res); 396 return; 397 } 398 399 /* Note this may cause RPC to be resent */ 400 hdr->mds_ops->rpc_call_done(task, data); 401 } 402 403 static void filelayout_write_count_stats(struct rpc_task *task, void *data) 404 { 405 struct nfs_pgio_header *hdr = data; 406 407 rpc_count_iostats(task, NFS_SERVER(hdr->inode)->client->cl_metrics); 408 } 409 410 static void filelayout_commit_prepare(struct rpc_task *task, void *data) 411 { 412 struct nfs_commit_data *wdata = data; 413 414 nfs4_setup_sequence(wdata->ds_clp, 415 &wdata->args.seq_args, 416 &wdata->res.seq_res, 417 task); 418 } 419 420 static void filelayout_commit_count_stats(struct rpc_task *task, void *data) 421 { 422 struct nfs_commit_data *cdata = data; 423 424 rpc_count_iostats(task, NFS_SERVER(cdata->inode)->client->cl_metrics); 425 } 426 427 static const struct rpc_call_ops filelayout_read_call_ops = { 428 .rpc_call_prepare = filelayout_read_prepare, 429 .rpc_call_done = filelayout_read_call_done, 430 .rpc_count_stats = filelayout_read_count_stats, 431 .rpc_release = pnfs_generic_rw_release, 432 }; 433 434 static const struct rpc_call_ops filelayout_write_call_ops = { 435 .rpc_call_prepare = filelayout_write_prepare, 436 .rpc_call_done = filelayout_write_call_done, 437 .rpc_count_stats = filelayout_write_count_stats, 438 .rpc_release = pnfs_generic_rw_release, 439 }; 440 441 static const struct rpc_call_ops filelayout_commit_call_ops = { 442 .rpc_call_prepare = filelayout_commit_prepare, 443 .rpc_call_done = pnfs_generic_write_commit_done, 444 .rpc_count_stats = filelayout_commit_count_stats, 445 .rpc_release = pnfs_generic_commit_release, 446 }; 447 448 static enum pnfs_try_status 449 filelayout_read_pagelist(struct nfs_pgio_header *hdr) 450 { 451 struct pnfs_layout_segment *lseg = hdr->lseg; 452 struct nfs4_pnfs_ds *ds; 453 struct rpc_clnt *ds_clnt; 454 loff_t offset = hdr->args.offset; 455 u32 j, idx; 456 struct nfs_fh *fh; 457 458 dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n", 459 __func__, hdr->inode->i_ino, 460 hdr->args.pgbase, (size_t)hdr->args.count, offset); 461 462 /* Retrieve the correct rpc_client for the byte range */ 463 j = nfs4_fl_calc_j_index(lseg, offset); 464 idx = nfs4_fl_calc_ds_index(lseg, j); 465 ds = nfs4_fl_prepare_ds(lseg, idx); 466 if (!ds) 467 return PNFS_NOT_ATTEMPTED; 468 469 ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, hdr->inode); 470 if (IS_ERR(ds_clnt)) 471 return PNFS_NOT_ATTEMPTED; 472 473 dprintk("%s USE DS: %s cl_count %d\n", __func__, 474 ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count)); 475 476 /* No multipath support. Use first DS */ 477 atomic_inc(&ds->ds_clp->cl_count); 478 hdr->ds_clp = ds->ds_clp; 479 hdr->ds_commit_idx = idx; 480 fh = nfs4_fl_select_ds_fh(lseg, j); 481 if (fh) 482 hdr->args.fh = fh; 483 484 hdr->args.offset = filelayout_get_dserver_offset(lseg, offset); 485 hdr->mds_offset = offset; 486 487 /* Perform an asynchronous read to ds */ 488 nfs_initiate_pgio(ds_clnt, hdr, hdr->cred, 489 NFS_PROTO(hdr->inode), &filelayout_read_call_ops, 490 0, RPC_TASK_SOFTCONN); 491 return PNFS_ATTEMPTED; 492 } 493 494 /* Perform async writes. */ 495 static enum pnfs_try_status 496 filelayout_write_pagelist(struct nfs_pgio_header *hdr, int sync) 497 { 498 struct pnfs_layout_segment *lseg = hdr->lseg; 499 struct nfs4_pnfs_ds *ds; 500 struct rpc_clnt *ds_clnt; 501 loff_t offset = hdr->args.offset; 502 u32 j, idx; 503 struct nfs_fh *fh; 504 505 /* Retrieve the correct rpc_client for the byte range */ 506 j = nfs4_fl_calc_j_index(lseg, offset); 507 idx = nfs4_fl_calc_ds_index(lseg, j); 508 ds = nfs4_fl_prepare_ds(lseg, idx); 509 if (!ds) 510 return PNFS_NOT_ATTEMPTED; 511 512 ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, hdr->inode); 513 if (IS_ERR(ds_clnt)) 514 return PNFS_NOT_ATTEMPTED; 515 516 dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d\n", 517 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count, 518 offset, ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count)); 519 520 hdr->pgio_done_cb = filelayout_write_done_cb; 521 atomic_inc(&ds->ds_clp->cl_count); 522 hdr->ds_clp = ds->ds_clp; 523 hdr->ds_commit_idx = idx; 524 fh = nfs4_fl_select_ds_fh(lseg, j); 525 if (fh) 526 hdr->args.fh = fh; 527 hdr->args.offset = filelayout_get_dserver_offset(lseg, offset); 528 529 /* Perform an asynchronous write */ 530 nfs_initiate_pgio(ds_clnt, hdr, hdr->cred, 531 NFS_PROTO(hdr->inode), &filelayout_write_call_ops, 532 sync, RPC_TASK_SOFTCONN); 533 return PNFS_ATTEMPTED; 534 } 535 536 static int 537 filelayout_check_deviceid(struct pnfs_layout_hdr *lo, 538 struct nfs4_filelayout_segment *fl, 539 gfp_t gfp_flags) 540 { 541 struct nfs4_deviceid_node *d; 542 struct nfs4_file_layout_dsaddr *dsaddr; 543 int status = -EINVAL; 544 545 /* Is the deviceid already set? If so, we're good. */ 546 if (fl->dsaddr != NULL) 547 return 0; 548 549 /* find and reference the deviceid */ 550 d = nfs4_find_get_deviceid(NFS_SERVER(lo->plh_inode), &fl->deviceid, 551 lo->plh_lc_cred, gfp_flags); 552 if (d == NULL) 553 goto out; 554 555 dsaddr = container_of(d, struct nfs4_file_layout_dsaddr, id_node); 556 /* Found deviceid is unavailable */ 557 if (filelayout_test_devid_unavailable(&dsaddr->id_node)) 558 goto out_put; 559 560 if (fl->first_stripe_index >= dsaddr->stripe_count) { 561 dprintk("%s Bad first_stripe_index %u\n", 562 __func__, fl->first_stripe_index); 563 goto out_put; 564 } 565 566 if ((fl->stripe_type == STRIPE_SPARSE && 567 fl->num_fh > 1 && fl->num_fh != dsaddr->ds_num) || 568 (fl->stripe_type == STRIPE_DENSE && 569 fl->num_fh != dsaddr->stripe_count)) { 570 dprintk("%s num_fh %u not valid for given packing\n", 571 __func__, fl->num_fh); 572 goto out_put; 573 } 574 status = 0; 575 576 /* 577 * Atomic compare and xchange to ensure we don't scribble 578 * over a non-NULL pointer. 579 */ 580 if (cmpxchg(&fl->dsaddr, NULL, dsaddr) != NULL) 581 goto out_put; 582 out: 583 return status; 584 out_put: 585 nfs4_fl_put_deviceid(dsaddr); 586 goto out; 587 } 588 589 /* 590 * filelayout_check_layout() 591 * 592 * Make sure layout segment parameters are sane WRT the device. 593 * At this point no generic layer initialization of the lseg has occurred, 594 * and nothing has been added to the layout_hdr cache. 595 * 596 */ 597 static int 598 filelayout_check_layout(struct pnfs_layout_hdr *lo, 599 struct nfs4_filelayout_segment *fl, 600 struct nfs4_layoutget_res *lgr, 601 gfp_t gfp_flags) 602 { 603 int status = -EINVAL; 604 605 dprintk("--> %s\n", __func__); 606 607 /* FIXME: remove this check when layout segment support is added */ 608 if (lgr->range.offset != 0 || 609 lgr->range.length != NFS4_MAX_UINT64) { 610 dprintk("%s Only whole file layouts supported. Use MDS i/o\n", 611 __func__); 612 goto out; 613 } 614 615 if (fl->pattern_offset > lgr->range.offset) { 616 dprintk("%s pattern_offset %lld too large\n", 617 __func__, fl->pattern_offset); 618 goto out; 619 } 620 621 if (!fl->stripe_unit) { 622 dprintk("%s Invalid stripe unit (%u)\n", 623 __func__, fl->stripe_unit); 624 goto out; 625 } 626 627 status = 0; 628 out: 629 dprintk("--> %s returns %d\n", __func__, status); 630 return status; 631 } 632 633 static void _filelayout_free_lseg(struct nfs4_filelayout_segment *fl) 634 { 635 int i; 636 637 if (fl->fh_array) { 638 for (i = 0; i < fl->num_fh; i++) { 639 if (!fl->fh_array[i]) 640 break; 641 kfree(fl->fh_array[i]); 642 } 643 kfree(fl->fh_array); 644 } 645 kfree(fl); 646 } 647 648 static int 649 filelayout_decode_layout(struct pnfs_layout_hdr *flo, 650 struct nfs4_filelayout_segment *fl, 651 struct nfs4_layoutget_res *lgr, 652 gfp_t gfp_flags) 653 { 654 struct xdr_stream stream; 655 struct xdr_buf buf; 656 struct page *scratch; 657 __be32 *p; 658 uint32_t nfl_util; 659 int i; 660 661 dprintk("%s: set_layout_map Begin\n", __func__); 662 663 scratch = alloc_page(gfp_flags); 664 if (!scratch) 665 return -ENOMEM; 666 667 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages, lgr->layoutp->len); 668 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE); 669 670 /* 20 = ufl_util (4), first_stripe_index (4), pattern_offset (8), 671 * num_fh (4) */ 672 p = xdr_inline_decode(&stream, NFS4_DEVICEID4_SIZE + 20); 673 if (unlikely(!p)) 674 goto out_err; 675 676 memcpy(&fl->deviceid, p, sizeof(fl->deviceid)); 677 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE); 678 nfs4_print_deviceid(&fl->deviceid); 679 680 nfl_util = be32_to_cpup(p++); 681 if (nfl_util & NFL4_UFLG_COMMIT_THRU_MDS) 682 fl->commit_through_mds = 1; 683 if (nfl_util & NFL4_UFLG_DENSE) 684 fl->stripe_type = STRIPE_DENSE; 685 else 686 fl->stripe_type = STRIPE_SPARSE; 687 fl->stripe_unit = nfl_util & ~NFL4_UFLG_MASK; 688 689 fl->first_stripe_index = be32_to_cpup(p++); 690 p = xdr_decode_hyper(p, &fl->pattern_offset); 691 fl->num_fh = be32_to_cpup(p++); 692 693 dprintk("%s: nfl_util 0x%X num_fh %u fsi %u po %llu\n", 694 __func__, nfl_util, fl->num_fh, fl->first_stripe_index, 695 fl->pattern_offset); 696 697 /* Note that a zero value for num_fh is legal for STRIPE_SPARSE. 698 * Futher checking is done in filelayout_check_layout */ 699 if (fl->num_fh > 700 max(NFS4_PNFS_MAX_STRIPE_CNT, NFS4_PNFS_MAX_MULTI_CNT)) 701 goto out_err; 702 703 if (fl->num_fh > 0) { 704 fl->fh_array = kcalloc(fl->num_fh, sizeof(fl->fh_array[0]), 705 gfp_flags); 706 if (!fl->fh_array) 707 goto out_err; 708 } 709 710 for (i = 0; i < fl->num_fh; i++) { 711 /* Do we want to use a mempool here? */ 712 fl->fh_array[i] = kmalloc(sizeof(struct nfs_fh), gfp_flags); 713 if (!fl->fh_array[i]) 714 goto out_err; 715 716 p = xdr_inline_decode(&stream, 4); 717 if (unlikely(!p)) 718 goto out_err; 719 fl->fh_array[i]->size = be32_to_cpup(p++); 720 if (sizeof(struct nfs_fh) < fl->fh_array[i]->size) { 721 printk(KERN_ERR "NFS: Too big fh %d received %d\n", 722 i, fl->fh_array[i]->size); 723 goto out_err; 724 } 725 726 p = xdr_inline_decode(&stream, fl->fh_array[i]->size); 727 if (unlikely(!p)) 728 goto out_err; 729 memcpy(fl->fh_array[i]->data, p, fl->fh_array[i]->size); 730 dprintk("DEBUG: %s: fh len %d\n", __func__, 731 fl->fh_array[i]->size); 732 } 733 734 __free_page(scratch); 735 return 0; 736 737 out_err: 738 __free_page(scratch); 739 return -EIO; 740 } 741 742 static void 743 filelayout_free_lseg(struct pnfs_layout_segment *lseg) 744 { 745 struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg); 746 747 dprintk("--> %s\n", __func__); 748 nfs4_fl_put_deviceid(fl->dsaddr); 749 /* This assumes a single RW lseg */ 750 if (lseg->pls_range.iomode == IOMODE_RW) { 751 struct nfs4_filelayout *flo; 752 753 flo = FILELAYOUT_FROM_HDR(lseg->pls_layout); 754 flo->commit_info.nbuckets = 0; 755 kfree(flo->commit_info.buckets); 756 flo->commit_info.buckets = NULL; 757 } 758 _filelayout_free_lseg(fl); 759 } 760 761 static int 762 filelayout_alloc_commit_info(struct pnfs_layout_segment *lseg, 763 struct nfs_commit_info *cinfo, 764 gfp_t gfp_flags) 765 { 766 struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg); 767 struct pnfs_commit_bucket *buckets; 768 int size, i; 769 770 if (fl->commit_through_mds) 771 return 0; 772 773 size = (fl->stripe_type == STRIPE_SPARSE) ? 774 fl->dsaddr->ds_num : fl->dsaddr->stripe_count; 775 776 if (cinfo->ds->nbuckets >= size) { 777 /* This assumes there is only one IOMODE_RW lseg. What 778 * we really want to do is have a layout_hdr level 779 * dictionary of <multipath_list4, fh> keys, each 780 * associated with a struct list_head, populated by calls 781 * to filelayout_write_pagelist(). 782 * */ 783 return 0; 784 } 785 786 buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket), 787 gfp_flags); 788 if (!buckets) 789 return -ENOMEM; 790 for (i = 0; i < size; i++) { 791 INIT_LIST_HEAD(&buckets[i].written); 792 INIT_LIST_HEAD(&buckets[i].committing); 793 /* mark direct verifier as unset */ 794 buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW; 795 } 796 797 spin_lock(&cinfo->inode->i_lock); 798 if (cinfo->ds->nbuckets >= size) 799 goto out; 800 for (i = 0; i < cinfo->ds->nbuckets; i++) { 801 list_splice(&cinfo->ds->buckets[i].written, 802 &buckets[i].written); 803 list_splice(&cinfo->ds->buckets[i].committing, 804 &buckets[i].committing); 805 buckets[i].direct_verf.committed = 806 cinfo->ds->buckets[i].direct_verf.committed; 807 buckets[i].wlseg = cinfo->ds->buckets[i].wlseg; 808 buckets[i].clseg = cinfo->ds->buckets[i].clseg; 809 } 810 swap(cinfo->ds->buckets, buckets); 811 cinfo->ds->nbuckets = size; 812 out: 813 spin_unlock(&cinfo->inode->i_lock); 814 kfree(buckets); 815 return 0; 816 } 817 818 static struct pnfs_layout_segment * 819 filelayout_alloc_lseg(struct pnfs_layout_hdr *layoutid, 820 struct nfs4_layoutget_res *lgr, 821 gfp_t gfp_flags) 822 { 823 struct nfs4_filelayout_segment *fl; 824 int rc; 825 826 dprintk("--> %s\n", __func__); 827 fl = kzalloc(sizeof(*fl), gfp_flags); 828 if (!fl) 829 return NULL; 830 831 rc = filelayout_decode_layout(layoutid, fl, lgr, gfp_flags); 832 if (rc != 0 || filelayout_check_layout(layoutid, fl, lgr, gfp_flags)) { 833 _filelayout_free_lseg(fl); 834 return NULL; 835 } 836 return &fl->generic_hdr; 837 } 838 839 /* 840 * filelayout_pg_test(). Called by nfs_can_coalesce_requests() 841 * 842 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number 843 * of bytes (maximum @req->wb_bytes) that can be coalesced. 844 */ 845 static size_t 846 filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, 847 struct nfs_page *req) 848 { 849 unsigned int size; 850 u64 p_stripe, r_stripe; 851 u32 stripe_offset; 852 u64 segment_offset = pgio->pg_lseg->pls_range.offset; 853 u32 stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit; 854 855 /* calls nfs_generic_pg_test */ 856 size = pnfs_generic_pg_test(pgio, prev, req); 857 if (!size) 858 return 0; 859 860 /* see if req and prev are in the same stripe */ 861 if (prev) { 862 p_stripe = (u64)req_offset(prev) - segment_offset; 863 r_stripe = (u64)req_offset(req) - segment_offset; 864 do_div(p_stripe, stripe_unit); 865 do_div(r_stripe, stripe_unit); 866 867 if (p_stripe != r_stripe) 868 return 0; 869 } 870 871 /* calculate remaining bytes in the current stripe */ 872 div_u64_rem((u64)req_offset(req) - segment_offset, 873 stripe_unit, 874 &stripe_offset); 875 WARN_ON_ONCE(stripe_offset > stripe_unit); 876 if (stripe_offset >= stripe_unit) 877 return 0; 878 return min(stripe_unit - (unsigned int)stripe_offset, size); 879 } 880 881 static struct pnfs_layout_segment * 882 fl_pnfs_update_layout(struct inode *ino, 883 struct nfs_open_context *ctx, 884 loff_t pos, 885 u64 count, 886 enum pnfs_iomode iomode, 887 bool strict_iomode, 888 gfp_t gfp_flags) 889 { 890 struct pnfs_layout_segment *lseg = NULL; 891 struct pnfs_layout_hdr *lo; 892 struct nfs4_filelayout_segment *fl; 893 int status; 894 895 lseg = pnfs_update_layout(ino, ctx, pos, count, iomode, strict_iomode, 896 gfp_flags); 897 if (!lseg) 898 lseg = ERR_PTR(-ENOMEM); 899 if (IS_ERR(lseg)) 900 goto out; 901 902 lo = NFS_I(ino)->layout; 903 fl = FILELAYOUT_LSEG(lseg); 904 905 status = filelayout_check_deviceid(lo, fl, gfp_flags); 906 if (status) { 907 pnfs_put_lseg(lseg); 908 lseg = ERR_PTR(status); 909 } 910 out: 911 return lseg; 912 } 913 914 static void 915 filelayout_pg_init_read(struct nfs_pageio_descriptor *pgio, 916 struct nfs_page *req) 917 { 918 pnfs_generic_pg_check_layout(pgio); 919 if (!pgio->pg_lseg) { 920 pgio->pg_lseg = fl_pnfs_update_layout(pgio->pg_inode, 921 req->wb_context, 922 0, 923 NFS4_MAX_UINT64, 924 IOMODE_READ, 925 false, 926 GFP_KERNEL); 927 if (IS_ERR(pgio->pg_lseg)) { 928 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 929 pgio->pg_lseg = NULL; 930 return; 931 } 932 } 933 /* If no lseg, fall back to read through mds */ 934 if (pgio->pg_lseg == NULL) 935 nfs_pageio_reset_read_mds(pgio); 936 } 937 938 static void 939 filelayout_pg_init_write(struct nfs_pageio_descriptor *pgio, 940 struct nfs_page *req) 941 { 942 struct nfs_commit_info cinfo; 943 int status; 944 945 pnfs_generic_pg_check_layout(pgio); 946 if (!pgio->pg_lseg) { 947 pgio->pg_lseg = fl_pnfs_update_layout(pgio->pg_inode, 948 req->wb_context, 949 0, 950 NFS4_MAX_UINT64, 951 IOMODE_RW, 952 false, 953 GFP_NOFS); 954 if (IS_ERR(pgio->pg_lseg)) { 955 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 956 pgio->pg_lseg = NULL; 957 return; 958 } 959 } 960 961 /* If no lseg, fall back to write through mds */ 962 if (pgio->pg_lseg == NULL) 963 goto out_mds; 964 nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq); 965 status = filelayout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS); 966 if (status < 0) { 967 pnfs_put_lseg(pgio->pg_lseg); 968 pgio->pg_lseg = NULL; 969 goto out_mds; 970 } 971 return; 972 out_mds: 973 nfs_pageio_reset_write_mds(pgio); 974 } 975 976 static const struct nfs_pageio_ops filelayout_pg_read_ops = { 977 .pg_init = filelayout_pg_init_read, 978 .pg_test = filelayout_pg_test, 979 .pg_doio = pnfs_generic_pg_readpages, 980 .pg_cleanup = pnfs_generic_pg_cleanup, 981 }; 982 983 static const struct nfs_pageio_ops filelayout_pg_write_ops = { 984 .pg_init = filelayout_pg_init_write, 985 .pg_test = filelayout_pg_test, 986 .pg_doio = pnfs_generic_pg_writepages, 987 .pg_cleanup = pnfs_generic_pg_cleanup, 988 }; 989 990 static u32 select_bucket_index(struct nfs4_filelayout_segment *fl, u32 j) 991 { 992 if (fl->stripe_type == STRIPE_SPARSE) 993 return nfs4_fl_calc_ds_index(&fl->generic_hdr, j); 994 else 995 return j; 996 } 997 998 static void 999 filelayout_mark_request_commit(struct nfs_page *req, 1000 struct pnfs_layout_segment *lseg, 1001 struct nfs_commit_info *cinfo, 1002 u32 ds_commit_idx) 1003 1004 { 1005 struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg); 1006 u32 i, j; 1007 1008 if (fl->commit_through_mds) { 1009 nfs_request_add_commit_list(req, cinfo); 1010 } else { 1011 /* Note that we are calling nfs4_fl_calc_j_index on each page 1012 * that ends up being committed to a data server. An attractive 1013 * alternative is to add a field to nfs_write_data and nfs_page 1014 * to store the value calculated in filelayout_write_pagelist 1015 * and just use that here. 1016 */ 1017 j = nfs4_fl_calc_j_index(lseg, req_offset(req)); 1018 i = select_bucket_index(fl, j); 1019 pnfs_layout_mark_request_commit(req, lseg, cinfo, i); 1020 } 1021 } 1022 1023 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i) 1024 { 1025 struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); 1026 1027 if (flseg->stripe_type == STRIPE_SPARSE) 1028 return i; 1029 else 1030 return nfs4_fl_calc_ds_index(lseg, i); 1031 } 1032 1033 static struct nfs_fh * 1034 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i) 1035 { 1036 struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); 1037 1038 if (flseg->stripe_type == STRIPE_SPARSE) { 1039 if (flseg->num_fh == 1) 1040 i = 0; 1041 else if (flseg->num_fh == 0) 1042 /* Use the MDS OPEN fh set in nfs_read_rpcsetup */ 1043 return NULL; 1044 } 1045 return flseg->fh_array[i]; 1046 } 1047 1048 static int filelayout_initiate_commit(struct nfs_commit_data *data, int how) 1049 { 1050 struct pnfs_layout_segment *lseg = data->lseg; 1051 struct nfs4_pnfs_ds *ds; 1052 struct rpc_clnt *ds_clnt; 1053 u32 idx; 1054 struct nfs_fh *fh; 1055 1056 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index); 1057 ds = nfs4_fl_prepare_ds(lseg, idx); 1058 if (!ds) 1059 goto out_err; 1060 1061 ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, data->inode); 1062 if (IS_ERR(ds_clnt)) 1063 goto out_err; 1064 1065 dprintk("%s ino %lu, how %d cl_count %d\n", __func__, 1066 data->inode->i_ino, how, atomic_read(&ds->ds_clp->cl_count)); 1067 data->commit_done_cb = filelayout_commit_done_cb; 1068 atomic_inc(&ds->ds_clp->cl_count); 1069 data->ds_clp = ds->ds_clp; 1070 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index); 1071 if (fh) 1072 data->args.fh = fh; 1073 return nfs_initiate_commit(ds_clnt, data, NFS_PROTO(data->inode), 1074 &filelayout_commit_call_ops, how, 1075 RPC_TASK_SOFTCONN); 1076 out_err: 1077 pnfs_generic_prepare_to_resend_writes(data); 1078 pnfs_generic_commit_release(data); 1079 return -EAGAIN; 1080 } 1081 1082 /* filelayout_search_commit_reqs - Search lists in @cinfo for the head reqest 1083 * for @page 1084 * @cinfo - commit info for current inode 1085 * @page - page to search for matching head request 1086 * 1087 * Returns a the head request if one is found, otherwise returns NULL. 1088 */ 1089 static struct nfs_page * 1090 filelayout_search_commit_reqs(struct nfs_commit_info *cinfo, struct page *page) 1091 { 1092 struct nfs_page *freq, *t; 1093 struct pnfs_commit_bucket *b; 1094 int i; 1095 1096 /* Linearly search the commit lists for each bucket until a matching 1097 * request is found */ 1098 for (i = 0, b = cinfo->ds->buckets; i < cinfo->ds->nbuckets; i++, b++) { 1099 list_for_each_entry_safe(freq, t, &b->written, wb_list) { 1100 if (freq->wb_page == page) 1101 return freq->wb_head; 1102 } 1103 list_for_each_entry_safe(freq, t, &b->committing, wb_list) { 1104 if (freq->wb_page == page) 1105 return freq->wb_head; 1106 } 1107 } 1108 1109 return NULL; 1110 } 1111 1112 static int 1113 filelayout_commit_pagelist(struct inode *inode, struct list_head *mds_pages, 1114 int how, struct nfs_commit_info *cinfo) 1115 { 1116 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo, 1117 filelayout_initiate_commit); 1118 } 1119 1120 static struct nfs4_deviceid_node * 1121 filelayout_alloc_deviceid_node(struct nfs_server *server, 1122 struct pnfs_device *pdev, gfp_t gfp_flags) 1123 { 1124 struct nfs4_file_layout_dsaddr *dsaddr; 1125 1126 dsaddr = nfs4_fl_alloc_deviceid_node(server, pdev, gfp_flags); 1127 if (!dsaddr) 1128 return NULL; 1129 return &dsaddr->id_node; 1130 } 1131 1132 static void 1133 filelayout_free_deviceid_node(struct nfs4_deviceid_node *d) 1134 { 1135 nfs4_fl_free_deviceid(container_of(d, struct nfs4_file_layout_dsaddr, id_node)); 1136 } 1137 1138 static struct pnfs_layout_hdr * 1139 filelayout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags) 1140 { 1141 struct nfs4_filelayout *flo; 1142 1143 flo = kzalloc(sizeof(*flo), gfp_flags); 1144 return flo != NULL ? &flo->generic_hdr : NULL; 1145 } 1146 1147 static void 1148 filelayout_free_layout_hdr(struct pnfs_layout_hdr *lo) 1149 { 1150 kfree(FILELAYOUT_FROM_HDR(lo)); 1151 } 1152 1153 static struct pnfs_ds_commit_info * 1154 filelayout_get_ds_info(struct inode *inode) 1155 { 1156 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout; 1157 1158 if (layout == NULL) 1159 return NULL; 1160 else 1161 return &FILELAYOUT_FROM_HDR(layout)->commit_info; 1162 } 1163 1164 static struct pnfs_layoutdriver_type filelayout_type = { 1165 .id = LAYOUT_NFSV4_1_FILES, 1166 .name = "LAYOUT_NFSV4_1_FILES", 1167 .owner = THIS_MODULE, 1168 .alloc_layout_hdr = filelayout_alloc_layout_hdr, 1169 .free_layout_hdr = filelayout_free_layout_hdr, 1170 .alloc_lseg = filelayout_alloc_lseg, 1171 .free_lseg = filelayout_free_lseg, 1172 .pg_read_ops = &filelayout_pg_read_ops, 1173 .pg_write_ops = &filelayout_pg_write_ops, 1174 .get_ds_info = &filelayout_get_ds_info, 1175 .mark_request_commit = filelayout_mark_request_commit, 1176 .clear_request_commit = pnfs_generic_clear_request_commit, 1177 .scan_commit_lists = pnfs_generic_scan_commit_lists, 1178 .recover_commit_reqs = pnfs_generic_recover_commit_reqs, 1179 .search_commit_reqs = filelayout_search_commit_reqs, 1180 .commit_pagelist = filelayout_commit_pagelist, 1181 .read_pagelist = filelayout_read_pagelist, 1182 .write_pagelist = filelayout_write_pagelist, 1183 .alloc_deviceid_node = filelayout_alloc_deviceid_node, 1184 .free_deviceid_node = filelayout_free_deviceid_node, 1185 .sync = pnfs_nfs_generic_sync, 1186 }; 1187 1188 static int __init nfs4filelayout_init(void) 1189 { 1190 printk(KERN_INFO "%s: NFSv4 File Layout Driver Registering...\n", 1191 __func__); 1192 return pnfs_register_layoutdriver(&filelayout_type); 1193 } 1194 1195 static void __exit nfs4filelayout_exit(void) 1196 { 1197 printk(KERN_INFO "%s: NFSv4 File Layout Driver Unregistering...\n", 1198 __func__); 1199 pnfs_unregister_layoutdriver(&filelayout_type); 1200 } 1201 1202 MODULE_ALIAS("nfs-layouttype4-1"); 1203 1204 module_init(nfs4filelayout_init); 1205 module_exit(nfs4filelayout_exit); 1206