1 /* 2 * Device operations for the pnfs nfs4 file layout driver. 3 * 4 * Copyright (c) 2014, Primary Data, Inc. All rights reserved. 5 * 6 * Tao Peng <bergwolf@primarydata.com> 7 */ 8 9 #include <linux/nfs_fs.h> 10 #include <linux/vmalloc.h> 11 #include <linux/module.h> 12 #include <linux/sunrpc/addr.h> 13 14 #include "../internal.h" 15 #include "../nfs4session.h" 16 #include "flexfilelayout.h" 17 18 #define NFSDBG_FACILITY NFSDBG_PNFS_LD 19 20 static unsigned int dataserver_timeo = NFS4_DEF_DS_TIMEO; 21 static unsigned int dataserver_retrans = NFS4_DEF_DS_RETRANS; 22 23 void nfs4_ff_layout_put_deviceid(struct nfs4_ff_layout_ds *mirror_ds) 24 { 25 if (mirror_ds) 26 nfs4_put_deviceid_node(&mirror_ds->id_node); 27 } 28 29 void nfs4_ff_layout_free_deviceid(struct nfs4_ff_layout_ds *mirror_ds) 30 { 31 nfs4_print_deviceid(&mirror_ds->id_node.deviceid); 32 nfs4_pnfs_ds_put(mirror_ds->ds); 33 kfree_rcu(mirror_ds, id_node.rcu); 34 } 35 36 /* Decode opaque device data and construct new_ds using it */ 37 struct nfs4_ff_layout_ds * 38 nfs4_ff_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev, 39 gfp_t gfp_flags) 40 { 41 struct xdr_stream stream; 42 struct xdr_buf buf; 43 struct page *scratch; 44 struct list_head dsaddrs; 45 struct nfs4_pnfs_ds_addr *da; 46 struct nfs4_ff_layout_ds *new_ds = NULL; 47 struct nfs4_ff_ds_version *ds_versions = NULL; 48 u32 mp_count; 49 u32 version_count; 50 __be32 *p; 51 int i, ret = -ENOMEM; 52 53 /* set up xdr stream */ 54 scratch = alloc_page(gfp_flags); 55 if (!scratch) 56 goto out_err; 57 58 new_ds = kzalloc(sizeof(struct nfs4_ff_layout_ds), gfp_flags); 59 if (!new_ds) 60 goto out_scratch; 61 62 nfs4_init_deviceid_node(&new_ds->id_node, 63 server, 64 &pdev->dev_id); 65 INIT_LIST_HEAD(&dsaddrs); 66 67 xdr_init_decode_pages(&stream, &buf, pdev->pages, pdev->pglen); 68 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE); 69 70 /* multipath count */ 71 p = xdr_inline_decode(&stream, 4); 72 if (unlikely(!p)) 73 goto out_err_drain_dsaddrs; 74 mp_count = be32_to_cpup(p); 75 dprintk("%s: multipath ds count %d\n", __func__, mp_count); 76 77 for (i = 0; i < mp_count; i++) { 78 /* multipath ds */ 79 da = nfs4_decode_mp_ds_addr(server->nfs_client->cl_net, 80 &stream, gfp_flags); 81 if (da) 82 list_add_tail(&da->da_node, &dsaddrs); 83 } 84 if (list_empty(&dsaddrs)) { 85 dprintk("%s: no suitable DS addresses found\n", 86 __func__); 87 ret = -ENOMEDIUM; 88 goto out_err_drain_dsaddrs; 89 } 90 91 /* version count */ 92 p = xdr_inline_decode(&stream, 4); 93 if (unlikely(!p)) 94 goto out_err_drain_dsaddrs; 95 version_count = be32_to_cpup(p); 96 dprintk("%s: version count %d\n", __func__, version_count); 97 98 ds_versions = kzalloc(version_count * sizeof(struct nfs4_ff_ds_version), 99 gfp_flags); 100 if (!ds_versions) 101 goto out_scratch; 102 103 for (i = 0; i < version_count; i++) { 104 /* 20 = version(4) + minor_version(4) + rsize(4) + wsize(4) + 105 * tightly_coupled(4) */ 106 p = xdr_inline_decode(&stream, 20); 107 if (unlikely(!p)) 108 goto out_err_drain_dsaddrs; 109 ds_versions[i].version = be32_to_cpup(p++); 110 ds_versions[i].minor_version = be32_to_cpup(p++); 111 ds_versions[i].rsize = nfs_block_size(be32_to_cpup(p++), NULL); 112 ds_versions[i].wsize = nfs_block_size(be32_to_cpup(p++), NULL); 113 ds_versions[i].tightly_coupled = be32_to_cpup(p); 114 115 if (ds_versions[i].rsize > NFS_MAX_FILE_IO_SIZE) 116 ds_versions[i].rsize = NFS_MAX_FILE_IO_SIZE; 117 if (ds_versions[i].wsize > NFS_MAX_FILE_IO_SIZE) 118 ds_versions[i].wsize = NFS_MAX_FILE_IO_SIZE; 119 120 if (ds_versions[i].version != 3 || ds_versions[i].minor_version != 0) { 121 dprintk("%s: [%d] unsupported ds version %d-%d\n", __func__, 122 i, ds_versions[i].version, 123 ds_versions[i].minor_version); 124 ret = -EPROTONOSUPPORT; 125 goto out_err_drain_dsaddrs; 126 } 127 128 dprintk("%s: [%d] vers %u minor_ver %u rsize %u wsize %u coupled %d\n", 129 __func__, i, ds_versions[i].version, 130 ds_versions[i].minor_version, 131 ds_versions[i].rsize, 132 ds_versions[i].wsize, 133 ds_versions[i].tightly_coupled); 134 } 135 136 new_ds->ds_versions = ds_versions; 137 new_ds->ds_versions_cnt = version_count; 138 139 new_ds->ds = nfs4_pnfs_ds_add(&dsaddrs, gfp_flags); 140 if (!new_ds->ds) 141 goto out_err_drain_dsaddrs; 142 143 /* If DS was already in cache, free ds addrs */ 144 while (!list_empty(&dsaddrs)) { 145 da = list_first_entry(&dsaddrs, 146 struct nfs4_pnfs_ds_addr, 147 da_node); 148 list_del_init(&da->da_node); 149 kfree(da->da_remotestr); 150 kfree(da); 151 } 152 153 __free_page(scratch); 154 return new_ds; 155 156 out_err_drain_dsaddrs: 157 while (!list_empty(&dsaddrs)) { 158 da = list_first_entry(&dsaddrs, struct nfs4_pnfs_ds_addr, 159 da_node); 160 list_del_init(&da->da_node); 161 kfree(da->da_remotestr); 162 kfree(da); 163 } 164 165 kfree(ds_versions); 166 out_scratch: 167 __free_page(scratch); 168 out_err: 169 kfree(new_ds); 170 171 dprintk("%s ERROR: returning %d\n", __func__, ret); 172 return NULL; 173 } 174 175 static void ff_layout_mark_devid_invalid(struct pnfs_layout_segment *lseg, 176 struct nfs4_deviceid_node *devid) 177 { 178 nfs4_mark_deviceid_unavailable(devid); 179 if (!ff_layout_has_available_ds(lseg)) 180 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, 181 lseg); 182 } 183 184 static bool ff_layout_mirror_valid(struct pnfs_layout_segment *lseg, 185 struct nfs4_ff_layout_mirror *mirror) 186 { 187 if (mirror == NULL || mirror->mirror_ds == NULL) { 188 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, 189 lseg); 190 return false; 191 } 192 if (mirror->mirror_ds->ds == NULL) { 193 struct nfs4_deviceid_node *devid; 194 devid = &mirror->mirror_ds->id_node; 195 ff_layout_mark_devid_invalid(lseg, devid); 196 return false; 197 } 198 return true; 199 } 200 201 static u64 202 end_offset(u64 start, u64 len) 203 { 204 u64 end; 205 206 end = start + len; 207 return end >= start ? end : NFS4_MAX_UINT64; 208 } 209 210 static void extend_ds_error(struct nfs4_ff_layout_ds_err *err, 211 u64 offset, u64 length) 212 { 213 u64 end; 214 215 end = max_t(u64, end_offset(err->offset, err->length), 216 end_offset(offset, length)); 217 err->offset = min_t(u64, err->offset, offset); 218 err->length = end - err->offset; 219 } 220 221 static int 222 ff_ds_error_match(const struct nfs4_ff_layout_ds_err *e1, 223 const struct nfs4_ff_layout_ds_err *e2) 224 { 225 int ret; 226 227 if (e1->opnum != e2->opnum) 228 return e1->opnum < e2->opnum ? -1 : 1; 229 if (e1->status != e2->status) 230 return e1->status < e2->status ? -1 : 1; 231 ret = memcmp(&e1->stateid, &e2->stateid, sizeof(e1->stateid)); 232 if (ret != 0) 233 return ret; 234 ret = memcmp(&e1->deviceid, &e2->deviceid, sizeof(e1->deviceid)); 235 if (ret != 0) 236 return ret; 237 if (end_offset(e1->offset, e1->length) < e2->offset) 238 return -1; 239 if (e1->offset > end_offset(e2->offset, e2->length)) 240 return 1; 241 /* If ranges overlap or are contiguous, they are the same */ 242 return 0; 243 } 244 245 static void 246 ff_layout_add_ds_error_locked(struct nfs4_flexfile_layout *flo, 247 struct nfs4_ff_layout_ds_err *dserr) 248 { 249 struct nfs4_ff_layout_ds_err *err, *tmp; 250 struct list_head *head = &flo->error_list; 251 int match; 252 253 /* Do insertion sort w/ merges */ 254 list_for_each_entry_safe(err, tmp, &flo->error_list, list) { 255 match = ff_ds_error_match(err, dserr); 256 if (match < 0) 257 continue; 258 if (match > 0) { 259 /* Add entry "dserr" _before_ entry "err" */ 260 head = &err->list; 261 break; 262 } 263 /* Entries match, so merge "err" into "dserr" */ 264 extend_ds_error(dserr, err->offset, err->length); 265 list_del(&err->list); 266 kfree(err); 267 } 268 269 list_add_tail(&dserr->list, head); 270 } 271 272 int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo, 273 struct nfs4_ff_layout_mirror *mirror, u64 offset, 274 u64 length, int status, enum nfs_opnum4 opnum, 275 gfp_t gfp_flags) 276 { 277 struct nfs4_ff_layout_ds_err *dserr; 278 279 if (status == 0) 280 return 0; 281 282 if (mirror->mirror_ds == NULL) 283 return -EINVAL; 284 285 dserr = kmalloc(sizeof(*dserr), gfp_flags); 286 if (!dserr) 287 return -ENOMEM; 288 289 INIT_LIST_HEAD(&dserr->list); 290 dserr->offset = offset; 291 dserr->length = length; 292 dserr->status = status; 293 dserr->opnum = opnum; 294 nfs4_stateid_copy(&dserr->stateid, &mirror->stateid); 295 memcpy(&dserr->deviceid, &mirror->mirror_ds->id_node.deviceid, 296 NFS4_DEVICEID4_SIZE); 297 298 spin_lock(&flo->generic_hdr.plh_inode->i_lock); 299 ff_layout_add_ds_error_locked(flo, dserr); 300 spin_unlock(&flo->generic_hdr.plh_inode->i_lock); 301 302 return 0; 303 } 304 305 /* currently we only support AUTH_NONE and AUTH_SYS */ 306 static rpc_authflavor_t 307 nfs4_ff_layout_choose_authflavor(struct nfs4_ff_layout_mirror *mirror) 308 { 309 if (mirror->uid == (u32)-1) 310 return RPC_AUTH_NULL; 311 return RPC_AUTH_UNIX; 312 } 313 314 /* fetch cred for NFSv3 DS */ 315 static int ff_layout_update_mirror_cred(struct nfs4_ff_layout_mirror *mirror, 316 struct nfs4_pnfs_ds *ds) 317 { 318 if (ds->ds_clp && !mirror->cred && 319 mirror->mirror_ds->ds_versions[0].version == 3) { 320 struct rpc_auth *auth = ds->ds_clp->cl_rpcclient->cl_auth; 321 struct rpc_cred *cred; 322 struct auth_cred acred = { 323 .uid = make_kuid(&init_user_ns, mirror->uid), 324 .gid = make_kgid(&init_user_ns, mirror->gid), 325 }; 326 327 /* AUTH_NULL ignores acred */ 328 cred = auth->au_ops->lookup_cred(auth, &acred, 0); 329 if (IS_ERR(cred)) { 330 dprintk("%s: lookup_cred failed with %ld\n", 331 __func__, PTR_ERR(cred)); 332 return PTR_ERR(cred); 333 } else { 334 if (cmpxchg(&mirror->cred, NULL, cred)) 335 put_rpccred(cred); 336 } 337 } 338 return 0; 339 } 340 341 struct nfs_fh * 342 nfs4_ff_layout_select_ds_fh(struct pnfs_layout_segment *lseg, u32 mirror_idx) 343 { 344 struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, mirror_idx); 345 struct nfs_fh *fh = NULL; 346 347 if (!ff_layout_mirror_valid(lseg, mirror)) { 348 pr_err_ratelimited("NFS: %s: No data server for mirror offset index %d\n", 349 __func__, mirror_idx); 350 goto out; 351 } 352 353 /* FIXME: For now assume there is only 1 version available for the DS */ 354 fh = &mirror->fh_versions[0]; 355 out: 356 return fh; 357 } 358 359 /* Upon return, either ds is connected, or ds is NULL */ 360 struct nfs4_pnfs_ds * 361 nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx, 362 bool fail_return) 363 { 364 struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx); 365 struct nfs4_pnfs_ds *ds = NULL; 366 struct nfs4_deviceid_node *devid; 367 struct inode *ino = lseg->pls_layout->plh_inode; 368 struct nfs_server *s = NFS_SERVER(ino); 369 unsigned int max_payload; 370 rpc_authflavor_t flavor; 371 372 if (!ff_layout_mirror_valid(lseg, mirror)) { 373 pr_err_ratelimited("NFS: %s: No data server for offset index %d\n", 374 __func__, ds_idx); 375 goto out; 376 } 377 378 devid = &mirror->mirror_ds->id_node; 379 if (ff_layout_test_devid_unavailable(devid)) 380 goto out; 381 382 ds = mirror->mirror_ds->ds; 383 /* matching smp_wmb() in _nfs4_pnfs_v3/4_ds_connect */ 384 smp_rmb(); 385 if (ds->ds_clp) 386 goto out_update_creds; 387 388 flavor = nfs4_ff_layout_choose_authflavor(mirror); 389 390 /* FIXME: For now we assume the server sent only one version of NFS 391 * to use for the DS. 392 */ 393 nfs4_pnfs_ds_connect(s, ds, devid, dataserver_timeo, 394 dataserver_retrans, 395 mirror->mirror_ds->ds_versions[0].version, 396 mirror->mirror_ds->ds_versions[0].minor_version, 397 flavor); 398 399 /* connect success, check rsize/wsize limit */ 400 if (ds->ds_clp) { 401 max_payload = 402 nfs_block_size(rpc_max_payload(ds->ds_clp->cl_rpcclient), 403 NULL); 404 if (mirror->mirror_ds->ds_versions[0].rsize > max_payload) 405 mirror->mirror_ds->ds_versions[0].rsize = max_payload; 406 if (mirror->mirror_ds->ds_versions[0].wsize > max_payload) 407 mirror->mirror_ds->ds_versions[0].wsize = max_payload; 408 } else { 409 ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout), 410 mirror, lseg->pls_range.offset, 411 lseg->pls_range.length, NFS4ERR_NXIO, 412 OP_ILLEGAL, GFP_NOIO); 413 if (!fail_return) { 414 if (ff_layout_has_available_ds(lseg)) 415 set_bit(NFS_LAYOUT_RETURN_REQUESTED, 416 &lseg->pls_layout->plh_flags); 417 else 418 pnfs_error_mark_layout_for_return(ino, lseg); 419 } else 420 pnfs_error_mark_layout_for_return(ino, lseg); 421 ds = NULL; 422 goto out; 423 } 424 out_update_creds: 425 if (ff_layout_update_mirror_cred(mirror, ds)) 426 ds = NULL; 427 out: 428 return ds; 429 } 430 431 struct rpc_cred * 432 ff_layout_get_ds_cred(struct pnfs_layout_segment *lseg, u32 ds_idx, 433 struct rpc_cred *mdscred) 434 { 435 struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx); 436 struct rpc_cred *cred = ERR_PTR(-EINVAL); 437 438 if (!nfs4_ff_layout_prepare_ds(lseg, ds_idx, true)) 439 goto out; 440 441 if (mirror && mirror->cred) 442 cred = mirror->cred; 443 else 444 cred = mdscred; 445 out: 446 return cred; 447 } 448 449 /** 450 * Find or create a DS rpc client with th MDS server rpc client auth flavor 451 * in the nfs_client cl_ds_clients list. 452 */ 453 struct rpc_clnt * 454 nfs4_ff_find_or_create_ds_client(struct pnfs_layout_segment *lseg, u32 ds_idx, 455 struct nfs_client *ds_clp, struct inode *inode) 456 { 457 struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx); 458 459 switch (mirror->mirror_ds->ds_versions[0].version) { 460 case 3: 461 /* For NFSv3 DS, flavor is set when creating DS connections */ 462 return ds_clp->cl_rpcclient; 463 case 4: 464 return nfs4_find_or_create_ds_client(ds_clp, inode); 465 default: 466 BUG(); 467 } 468 } 469 470 static bool is_range_intersecting(u64 offset1, u64 length1, 471 u64 offset2, u64 length2) 472 { 473 u64 end1 = end_offset(offset1, length1); 474 u64 end2 = end_offset(offset2, length2); 475 476 return (end1 == NFS4_MAX_UINT64 || end1 > offset2) && 477 (end2 == NFS4_MAX_UINT64 || end2 > offset1); 478 } 479 480 /* called with inode i_lock held */ 481 int ff_layout_encode_ds_ioerr(struct nfs4_flexfile_layout *flo, 482 struct xdr_stream *xdr, int *count, 483 const struct pnfs_layout_range *range) 484 { 485 struct nfs4_ff_layout_ds_err *err, *n; 486 __be32 *p; 487 488 list_for_each_entry_safe(err, n, &flo->error_list, list) { 489 if (!is_range_intersecting(err->offset, err->length, 490 range->offset, range->length)) 491 continue; 492 /* offset(8) + length(8) + stateid(NFS4_STATEID_SIZE) 493 * + array length + deviceid(NFS4_DEVICEID4_SIZE) 494 * + status(4) + opnum(4) 495 */ 496 p = xdr_reserve_space(xdr, 497 28 + NFS4_STATEID_SIZE + NFS4_DEVICEID4_SIZE); 498 if (unlikely(!p)) 499 return -ENOBUFS; 500 p = xdr_encode_hyper(p, err->offset); 501 p = xdr_encode_hyper(p, err->length); 502 p = xdr_encode_opaque_fixed(p, &err->stateid, 503 NFS4_STATEID_SIZE); 504 /* Encode 1 error */ 505 *p++ = cpu_to_be32(1); 506 p = xdr_encode_opaque_fixed(p, &err->deviceid, 507 NFS4_DEVICEID4_SIZE); 508 *p++ = cpu_to_be32(err->status); 509 *p++ = cpu_to_be32(err->opnum); 510 *count += 1; 511 list_del(&err->list); 512 dprintk("%s: offset %llu length %llu status %d op %d count %d\n", 513 __func__, err->offset, err->length, err->status, 514 err->opnum, *count); 515 kfree(err); 516 } 517 518 return 0; 519 } 520 521 static bool ff_read_layout_has_available_ds(struct pnfs_layout_segment *lseg) 522 { 523 struct nfs4_ff_layout_mirror *mirror; 524 struct nfs4_deviceid_node *devid; 525 u32 idx; 526 527 for (idx = 0; idx < FF_LAYOUT_MIRROR_COUNT(lseg); idx++) { 528 mirror = FF_LAYOUT_COMP(lseg, idx); 529 if (mirror && mirror->mirror_ds) { 530 devid = &mirror->mirror_ds->id_node; 531 if (!ff_layout_test_devid_unavailable(devid)) 532 return true; 533 } 534 } 535 536 return false; 537 } 538 539 static bool ff_rw_layout_has_available_ds(struct pnfs_layout_segment *lseg) 540 { 541 struct nfs4_ff_layout_mirror *mirror; 542 struct nfs4_deviceid_node *devid; 543 u32 idx; 544 545 for (idx = 0; idx < FF_LAYOUT_MIRROR_COUNT(lseg); idx++) { 546 mirror = FF_LAYOUT_COMP(lseg, idx); 547 if (!mirror || !mirror->mirror_ds) 548 return false; 549 devid = &mirror->mirror_ds->id_node; 550 if (ff_layout_test_devid_unavailable(devid)) 551 return false; 552 } 553 554 return FF_LAYOUT_MIRROR_COUNT(lseg) != 0; 555 } 556 557 bool ff_layout_has_available_ds(struct pnfs_layout_segment *lseg) 558 { 559 if (lseg->pls_range.iomode == IOMODE_READ) 560 return ff_read_layout_has_available_ds(lseg); 561 /* Note: RW layout needs all mirrors available */ 562 return ff_rw_layout_has_available_ds(lseg); 563 } 564 565 module_param(dataserver_retrans, uint, 0644); 566 MODULE_PARM_DESC(dataserver_retrans, "The number of times the NFSv4.1 client " 567 "retries a request before it attempts further " 568 " recovery action."); 569 module_param(dataserver_timeo, uint, 0644); 570 MODULE_PARM_DESC(dataserver_timeo, "The time (in tenths of a second) the " 571 "NFSv4.1 client waits for a response from a " 572 " data server before it retries an NFS request."); 573