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 static const struct pnfs_commit_ops filelayout_commit_ops; 53 54 static loff_t 55 filelayout_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 */ 73 static loff_t 74 filelayout_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 89 static 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 } 105 106 static 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 } 122 123 static 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 dprintk("%s DS connection error %d\n", __func__, 185 task->tk_status); 186 nfs4_mark_deviceid_unavailable(devid); 187 pnfs_error_mark_layout_for_return(inode, lseg); 188 pnfs_set_lo_fail(lseg); 189 rpc_wake_up(&tbl->slot_tbl_waitq); 190 /* fall through */ 191 default: 192 reset: 193 dprintk("%s Retry through MDS. Error %d\n", __func__, 194 task->tk_status); 195 return -NFS4ERR_RESET_TO_MDS; 196 } 197 task->tk_status = 0; 198 return -EAGAIN; 199 } 200 201 /* NFS_PROTO call done callback routines */ 202 203 static int filelayout_read_done_cb(struct rpc_task *task, 204 struct nfs_pgio_header *hdr) 205 { 206 int err; 207 208 trace_nfs4_pnfs_read(hdr, task->tk_status); 209 err = filelayout_async_handle_error(task, hdr->args.context->state, 210 hdr->ds_clp, hdr->lseg); 211 212 switch (err) { 213 case -NFS4ERR_RESET_TO_MDS: 214 filelayout_reset_read(hdr); 215 return task->tk_status; 216 case -EAGAIN: 217 rpc_restart_call_prepare(task); 218 return -EAGAIN; 219 } 220 221 return 0; 222 } 223 224 /* 225 * We reference the rpc_cred of the first WRITE that triggers the need for 226 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound. 227 * rfc5661 is not clear about which credential should be used. 228 */ 229 static void 230 filelayout_set_layoutcommit(struct nfs_pgio_header *hdr) 231 { 232 loff_t end_offs = 0; 233 234 if (FILELAYOUT_LSEG(hdr->lseg)->commit_through_mds || 235 hdr->res.verf->committed == NFS_FILE_SYNC) 236 return; 237 if (hdr->res.verf->committed == NFS_DATA_SYNC) 238 end_offs = hdr->mds_offset + (loff_t)hdr->res.count; 239 240 /* Note: if the write is unstable, don't set end_offs until commit */ 241 pnfs_set_layoutcommit(hdr->inode, hdr->lseg, end_offs); 242 dprintk("%s inode %lu pls_end_pos %lu\n", __func__, hdr->inode->i_ino, 243 (unsigned long) NFS_I(hdr->inode)->layout->plh_lwb); 244 } 245 246 bool 247 filelayout_test_devid_unavailable(struct nfs4_deviceid_node *node) 248 { 249 return filelayout_test_devid_invalid(node) || 250 nfs4_test_deviceid_unavailable(node); 251 } 252 253 static bool 254 filelayout_reset_to_mds(struct pnfs_layout_segment *lseg) 255 { 256 struct nfs4_deviceid_node *node = FILELAYOUT_DEVID_NODE(lseg); 257 258 return filelayout_test_devid_unavailable(node); 259 } 260 261 /* 262 * Call ops for the async read/write cases 263 * In the case of dense layouts, the offset needs to be reset to its 264 * original value. 265 */ 266 static void filelayout_read_prepare(struct rpc_task *task, void *data) 267 { 268 struct nfs_pgio_header *hdr = data; 269 270 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 271 rpc_exit(task, -EIO); 272 return; 273 } 274 if (filelayout_reset_to_mds(hdr->lseg)) { 275 dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid); 276 filelayout_reset_read(hdr); 277 rpc_exit(task, 0); 278 return; 279 } 280 hdr->pgio_done_cb = filelayout_read_done_cb; 281 282 if (nfs4_setup_sequence(hdr->ds_clp, 283 &hdr->args.seq_args, 284 &hdr->res.seq_res, 285 task)) 286 return; 287 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 288 hdr->args.lock_context, FMODE_READ) == -EIO) 289 rpc_exit(task, -EIO); /* lost lock, terminate I/O */ 290 } 291 292 static void filelayout_read_call_done(struct rpc_task *task, void *data) 293 { 294 struct nfs_pgio_header *hdr = data; 295 296 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status); 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 } 307 308 static 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 } 314 315 static 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 } 342 343 static 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 } 365 366 static 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 } 389 390 static 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 } 403 404 static 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 } 410 411 static 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 } 420 421 static 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 } 427 428 static 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 }; 434 435 static 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 }; 441 442 static 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 }; 448 449 static enum pnfs_try_status 450 filelayout_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. */ 496 static enum pnfs_try_status 497 filelayout_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 } 536 537 static int 538 filelayout_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; 583 out: 584 return status; 585 out_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 */ 598 static int 599 filelayout_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; 629 out: 630 dprintk("--> %s returns %d\n", __func__, status); 631 return status; 632 } 633 634 static 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 } 648 649 static int 650 filelayout_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_buffer(&stream, page_address(scratch), PAGE_SIZE); 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 (sizeof(struct nfs_fh) < fl->fh_array[i]->size) { 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; 737 738 out_err: 739 __free_page(scratch); 740 return -EIO; 741 } 742 743 static void 744 filelayout_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 } 764 765 static struct pnfs_layout_segment * 766 filelayout_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 } 785 786 /* 787 * filelayout_pg_test(). Called by nfs_can_coalesce_requests() 788 * 789 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number 790 * of bytes (maximum @req->wb_bytes) that can be coalesced. 791 */ 792 static size_t 793 filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, 794 struct nfs_page *req) 795 { 796 unsigned int size; 797 u64 p_stripe, r_stripe; 798 u32 stripe_offset; 799 u64 segment_offset = pgio->pg_lseg->pls_range.offset; 800 u32 stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit; 801 802 /* calls nfs_generic_pg_test */ 803 size = pnfs_generic_pg_test(pgio, prev, req); 804 if (!size) 805 return 0; 806 807 /* see if req and prev are in the same stripe */ 808 if (prev) { 809 p_stripe = (u64)req_offset(prev) - segment_offset; 810 r_stripe = (u64)req_offset(req) - segment_offset; 811 do_div(p_stripe, stripe_unit); 812 do_div(r_stripe, stripe_unit); 813 814 if (p_stripe != r_stripe) 815 return 0; 816 } 817 818 /* calculate remaining bytes in the current stripe */ 819 div_u64_rem((u64)req_offset(req) - segment_offset, 820 stripe_unit, 821 &stripe_offset); 822 WARN_ON_ONCE(stripe_offset > stripe_unit); 823 if (stripe_offset >= stripe_unit) 824 return 0; 825 return min(stripe_unit - (unsigned int)stripe_offset, size); 826 } 827 828 static struct pnfs_layout_segment * 829 fl_pnfs_update_layout(struct inode *ino, 830 struct nfs_open_context *ctx, 831 loff_t pos, 832 u64 count, 833 enum pnfs_iomode iomode, 834 bool strict_iomode, 835 gfp_t gfp_flags) 836 { 837 struct pnfs_layout_segment *lseg = NULL; 838 struct pnfs_layout_hdr *lo; 839 struct nfs4_filelayout_segment *fl; 840 int status; 841 842 lseg = pnfs_update_layout(ino, ctx, pos, count, iomode, strict_iomode, 843 gfp_flags); 844 if (IS_ERR_OR_NULL(lseg)) 845 goto out; 846 847 lo = NFS_I(ino)->layout; 848 fl = FILELAYOUT_LSEG(lseg); 849 850 status = filelayout_check_deviceid(lo, fl, gfp_flags); 851 if (status) { 852 pnfs_put_lseg(lseg); 853 lseg = NULL; 854 } 855 out: 856 return lseg; 857 } 858 859 static void 860 filelayout_pg_init_read(struct nfs_pageio_descriptor *pgio, 861 struct nfs_page *req) 862 { 863 pnfs_generic_pg_check_layout(pgio); 864 if (!pgio->pg_lseg) { 865 pgio->pg_lseg = fl_pnfs_update_layout(pgio->pg_inode, 866 nfs_req_openctx(req), 867 0, 868 NFS4_MAX_UINT64, 869 IOMODE_READ, 870 false, 871 GFP_KERNEL); 872 if (IS_ERR(pgio->pg_lseg)) { 873 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 874 pgio->pg_lseg = NULL; 875 return; 876 } 877 } 878 /* If no lseg, fall back to read through mds */ 879 if (pgio->pg_lseg == NULL) 880 nfs_pageio_reset_read_mds(pgio); 881 } 882 883 static void 884 filelayout_pg_init_write(struct nfs_pageio_descriptor *pgio, 885 struct nfs_page *req) 886 { 887 pnfs_generic_pg_check_layout(pgio); 888 if (!pgio->pg_lseg) { 889 pgio->pg_lseg = fl_pnfs_update_layout(pgio->pg_inode, 890 nfs_req_openctx(req), 891 0, 892 NFS4_MAX_UINT64, 893 IOMODE_RW, 894 false, 895 GFP_NOFS); 896 if (IS_ERR(pgio->pg_lseg)) { 897 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 898 pgio->pg_lseg = NULL; 899 return; 900 } 901 } 902 903 /* If no lseg, fall back to write through mds */ 904 if (pgio->pg_lseg == NULL) 905 nfs_pageio_reset_write_mds(pgio); 906 } 907 908 static const struct nfs_pageio_ops filelayout_pg_read_ops = { 909 .pg_init = filelayout_pg_init_read, 910 .pg_test = filelayout_pg_test, 911 .pg_doio = pnfs_generic_pg_readpages, 912 .pg_cleanup = pnfs_generic_pg_cleanup, 913 }; 914 915 static const struct nfs_pageio_ops filelayout_pg_write_ops = { 916 .pg_init = filelayout_pg_init_write, 917 .pg_test = filelayout_pg_test, 918 .pg_doio = pnfs_generic_pg_writepages, 919 .pg_cleanup = pnfs_generic_pg_cleanup, 920 }; 921 922 static u32 select_bucket_index(struct nfs4_filelayout_segment *fl, u32 j) 923 { 924 if (fl->stripe_type == STRIPE_SPARSE) 925 return nfs4_fl_calc_ds_index(&fl->generic_hdr, j); 926 else 927 return j; 928 } 929 930 static void 931 filelayout_mark_request_commit(struct nfs_page *req, 932 struct pnfs_layout_segment *lseg, 933 struct nfs_commit_info *cinfo, 934 u32 ds_commit_idx) 935 936 { 937 struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg); 938 u32 i, j; 939 940 if (fl->commit_through_mds) { 941 nfs_request_add_commit_list(req, cinfo); 942 } else { 943 /* Note that we are calling nfs4_fl_calc_j_index on each page 944 * that ends up being committed to a data server. An attractive 945 * alternative is to add a field to nfs_write_data and nfs_page 946 * to store the value calculated in filelayout_write_pagelist 947 * and just use that here. 948 */ 949 j = nfs4_fl_calc_j_index(lseg, req_offset(req)); 950 i = select_bucket_index(fl, j); 951 pnfs_layout_mark_request_commit(req, lseg, cinfo, i); 952 } 953 } 954 955 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i) 956 { 957 struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); 958 959 if (flseg->stripe_type == STRIPE_SPARSE) 960 return i; 961 else 962 return nfs4_fl_calc_ds_index(lseg, i); 963 } 964 965 static struct nfs_fh * 966 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i) 967 { 968 struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); 969 970 if (flseg->stripe_type == STRIPE_SPARSE) { 971 if (flseg->num_fh == 1) 972 i = 0; 973 else if (flseg->num_fh == 0) 974 /* Use the MDS OPEN fh set in nfs_read_rpcsetup */ 975 return NULL; 976 } 977 return flseg->fh_array[i]; 978 } 979 980 static int filelayout_initiate_commit(struct nfs_commit_data *data, int how) 981 { 982 struct pnfs_layout_segment *lseg = data->lseg; 983 struct nfs4_pnfs_ds *ds; 984 struct rpc_clnt *ds_clnt; 985 u32 idx; 986 struct nfs_fh *fh; 987 988 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index); 989 ds = nfs4_fl_prepare_ds(lseg, idx); 990 if (!ds) 991 goto out_err; 992 993 ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, data->inode); 994 if (IS_ERR(ds_clnt)) 995 goto out_err; 996 997 dprintk("%s ino %lu, how %d cl_count %d\n", __func__, 998 data->inode->i_ino, how, refcount_read(&ds->ds_clp->cl_count)); 999 data->commit_done_cb = filelayout_commit_done_cb; 1000 refcount_inc(&ds->ds_clp->cl_count); 1001 data->ds_clp = ds->ds_clp; 1002 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index); 1003 if (fh) 1004 data->args.fh = fh; 1005 return nfs_initiate_commit(ds_clnt, data, NFS_PROTO(data->inode), 1006 &filelayout_commit_call_ops, how, 1007 RPC_TASK_SOFTCONN); 1008 out_err: 1009 pnfs_generic_prepare_to_resend_writes(data); 1010 pnfs_generic_commit_release(data); 1011 return -EAGAIN; 1012 } 1013 1014 static int 1015 filelayout_commit_pagelist(struct inode *inode, struct list_head *mds_pages, 1016 int how, struct nfs_commit_info *cinfo) 1017 { 1018 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo, 1019 filelayout_initiate_commit); 1020 } 1021 1022 static struct nfs4_deviceid_node * 1023 filelayout_alloc_deviceid_node(struct nfs_server *server, 1024 struct pnfs_device *pdev, gfp_t gfp_flags) 1025 { 1026 struct nfs4_file_layout_dsaddr *dsaddr; 1027 1028 dsaddr = nfs4_fl_alloc_deviceid_node(server, pdev, gfp_flags); 1029 if (!dsaddr) 1030 return NULL; 1031 return &dsaddr->id_node; 1032 } 1033 1034 static void 1035 filelayout_free_deviceid_node(struct nfs4_deviceid_node *d) 1036 { 1037 nfs4_fl_free_deviceid(container_of(d, struct nfs4_file_layout_dsaddr, id_node)); 1038 } 1039 1040 static struct pnfs_layout_hdr * 1041 filelayout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags) 1042 { 1043 struct nfs4_filelayout *flo; 1044 1045 flo = kzalloc(sizeof(*flo), gfp_flags); 1046 if (flo == NULL) 1047 return NULL; 1048 pnfs_init_ds_commit_info(&flo->commit_info); 1049 flo->commit_info.ops = &filelayout_commit_ops; 1050 return &flo->generic_hdr; 1051 } 1052 1053 static void 1054 filelayout_free_layout_hdr(struct pnfs_layout_hdr *lo) 1055 { 1056 kfree_rcu(FILELAYOUT_FROM_HDR(lo), generic_hdr.plh_rcu); 1057 } 1058 1059 static struct pnfs_ds_commit_info * 1060 filelayout_get_ds_info(struct inode *inode) 1061 { 1062 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout; 1063 1064 if (layout == NULL) 1065 return NULL; 1066 else 1067 return &FILELAYOUT_FROM_HDR(layout)->commit_info; 1068 } 1069 1070 static void 1071 filelayout_setup_ds_info(struct pnfs_ds_commit_info *fl_cinfo, 1072 struct pnfs_layout_segment *lseg) 1073 { 1074 struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg); 1075 struct inode *inode = lseg->pls_layout->plh_inode; 1076 struct pnfs_commit_array *array, *new; 1077 unsigned int size = (fl->stripe_type == STRIPE_SPARSE) ? 1078 fl->dsaddr->ds_num : fl->dsaddr->stripe_count; 1079 1080 new = pnfs_alloc_commit_array(size, GFP_NOIO); 1081 if (new) { 1082 spin_lock(&inode->i_lock); 1083 array = pnfs_add_commit_array(fl_cinfo, new, lseg); 1084 spin_unlock(&inode->i_lock); 1085 if (array != new) 1086 pnfs_free_commit_array(new); 1087 } 1088 } 1089 1090 static void 1091 filelayout_release_ds_info(struct pnfs_ds_commit_info *fl_cinfo, 1092 struct inode *inode) 1093 { 1094 spin_lock(&inode->i_lock); 1095 pnfs_generic_ds_cinfo_destroy(fl_cinfo); 1096 spin_unlock(&inode->i_lock); 1097 } 1098 1099 static const struct pnfs_commit_ops filelayout_commit_ops = { 1100 .setup_ds_info = filelayout_setup_ds_info, 1101 .release_ds_info = filelayout_release_ds_info, 1102 .mark_request_commit = filelayout_mark_request_commit, 1103 .clear_request_commit = pnfs_generic_clear_request_commit, 1104 .scan_commit_lists = pnfs_generic_scan_commit_lists, 1105 .recover_commit_reqs = pnfs_generic_recover_commit_reqs, 1106 .search_commit_reqs = pnfs_generic_search_commit_reqs, 1107 .commit_pagelist = filelayout_commit_pagelist, 1108 }; 1109 1110 static struct pnfs_layoutdriver_type filelayout_type = { 1111 .id = LAYOUT_NFSV4_1_FILES, 1112 .name = "LAYOUT_NFSV4_1_FILES", 1113 .owner = THIS_MODULE, 1114 .flags = PNFS_LAYOUTGET_ON_OPEN, 1115 .max_layoutget_response = 4096, /* 1 page or so... */ 1116 .alloc_layout_hdr = filelayout_alloc_layout_hdr, 1117 .free_layout_hdr = filelayout_free_layout_hdr, 1118 .alloc_lseg = filelayout_alloc_lseg, 1119 .free_lseg = filelayout_free_lseg, 1120 .pg_read_ops = &filelayout_pg_read_ops, 1121 .pg_write_ops = &filelayout_pg_write_ops, 1122 .get_ds_info = &filelayout_get_ds_info, 1123 .read_pagelist = filelayout_read_pagelist, 1124 .write_pagelist = filelayout_write_pagelist, 1125 .alloc_deviceid_node = filelayout_alloc_deviceid_node, 1126 .free_deviceid_node = filelayout_free_deviceid_node, 1127 .sync = pnfs_nfs_generic_sync, 1128 }; 1129 1130 static int __init nfs4filelayout_init(void) 1131 { 1132 printk(KERN_INFO "%s: NFSv4 File Layout Driver Registering...\n", 1133 __func__); 1134 return pnfs_register_layoutdriver(&filelayout_type); 1135 } 1136 1137 static void __exit nfs4filelayout_exit(void) 1138 { 1139 printk(KERN_INFO "%s: NFSv4 File Layout Driver Unregistering...\n", 1140 __func__); 1141 pnfs_unregister_layoutdriver(&filelayout_type); 1142 } 1143 1144 MODULE_ALIAS("nfs-layouttype4-1"); 1145 1146 module_init(nfs4filelayout_init); 1147 module_exit(nfs4filelayout_exit); 1148