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 u64 176 end_offset(u64 start, u64 len) 177 { 178 u64 end; 179 180 end = start + len; 181 return end >= start ? end : NFS4_MAX_UINT64; 182 } 183 184 static void extend_ds_error(struct nfs4_ff_layout_ds_err *err, 185 u64 offset, u64 length) 186 { 187 u64 end; 188 189 end = max_t(u64, end_offset(err->offset, err->length), 190 end_offset(offset, length)); 191 err->offset = min_t(u64, err->offset, offset); 192 err->length = end - err->offset; 193 } 194 195 static bool ds_error_can_merge(struct nfs4_ff_layout_ds_err *err, u64 offset, 196 u64 length, int status, enum nfs_opnum4 opnum, 197 nfs4_stateid *stateid, 198 struct nfs4_deviceid *deviceid) 199 { 200 return err->status == status && err->opnum == opnum && 201 nfs4_stateid_match(&err->stateid, stateid) && 202 !memcmp(&err->deviceid, deviceid, sizeof(*deviceid)) && 203 end_offset(err->offset, err->length) >= offset && 204 err->offset <= end_offset(offset, length); 205 } 206 207 static bool merge_ds_error(struct nfs4_ff_layout_ds_err *old, 208 struct nfs4_ff_layout_ds_err *new) 209 { 210 if (!ds_error_can_merge(old, new->offset, new->length, new->status, 211 new->opnum, &new->stateid, &new->deviceid)) 212 return false; 213 214 extend_ds_error(old, new->offset, new->length); 215 return true; 216 } 217 218 static bool 219 ff_layout_add_ds_error_locked(struct nfs4_flexfile_layout *flo, 220 struct nfs4_ff_layout_ds_err *dserr) 221 { 222 struct nfs4_ff_layout_ds_err *err; 223 224 list_for_each_entry(err, &flo->error_list, list) { 225 if (merge_ds_error(err, dserr)) { 226 return true; 227 } 228 } 229 230 list_add(&dserr->list, &flo->error_list); 231 return false; 232 } 233 234 static bool 235 ff_layout_update_ds_error(struct nfs4_flexfile_layout *flo, u64 offset, 236 u64 length, int status, enum nfs_opnum4 opnum, 237 nfs4_stateid *stateid, struct nfs4_deviceid *deviceid) 238 { 239 bool found = false; 240 struct nfs4_ff_layout_ds_err *err; 241 242 list_for_each_entry(err, &flo->error_list, list) { 243 if (ds_error_can_merge(err, offset, length, status, opnum, 244 stateid, deviceid)) { 245 found = true; 246 extend_ds_error(err, offset, length); 247 break; 248 } 249 } 250 251 return found; 252 } 253 254 int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo, 255 struct nfs4_ff_layout_mirror *mirror, u64 offset, 256 u64 length, int status, enum nfs_opnum4 opnum, 257 gfp_t gfp_flags) 258 { 259 struct nfs4_ff_layout_ds_err *dserr; 260 bool needfree; 261 262 if (status == 0) 263 return 0; 264 265 if (mirror->mirror_ds == NULL) 266 return -EINVAL; 267 268 spin_lock(&flo->generic_hdr.plh_inode->i_lock); 269 if (ff_layout_update_ds_error(flo, offset, length, status, opnum, 270 &mirror->stateid, 271 &mirror->mirror_ds->id_node.deviceid)) { 272 spin_unlock(&flo->generic_hdr.plh_inode->i_lock); 273 return 0; 274 } 275 spin_unlock(&flo->generic_hdr.plh_inode->i_lock); 276 dserr = kmalloc(sizeof(*dserr), gfp_flags); 277 if (!dserr) 278 return -ENOMEM; 279 280 INIT_LIST_HEAD(&dserr->list); 281 dserr->offset = offset; 282 dserr->length = length; 283 dserr->status = status; 284 dserr->opnum = opnum; 285 nfs4_stateid_copy(&dserr->stateid, &mirror->stateid); 286 memcpy(&dserr->deviceid, &mirror->mirror_ds->id_node.deviceid, 287 NFS4_DEVICEID4_SIZE); 288 289 spin_lock(&flo->generic_hdr.plh_inode->i_lock); 290 needfree = ff_layout_add_ds_error_locked(flo, dserr); 291 spin_unlock(&flo->generic_hdr.plh_inode->i_lock); 292 if (needfree) 293 kfree(dserr); 294 295 return 0; 296 } 297 298 /* currently we only support AUTH_NONE and AUTH_SYS */ 299 static rpc_authflavor_t 300 nfs4_ff_layout_choose_authflavor(struct nfs4_ff_layout_mirror *mirror) 301 { 302 if (mirror->uid == (u32)-1) 303 return RPC_AUTH_NULL; 304 return RPC_AUTH_UNIX; 305 } 306 307 /* fetch cred for NFSv3 DS */ 308 static int ff_layout_update_mirror_cred(struct nfs4_ff_layout_mirror *mirror, 309 struct nfs4_pnfs_ds *ds) 310 { 311 if (ds->ds_clp && !mirror->cred && 312 mirror->mirror_ds->ds_versions[0].version == 3) { 313 struct rpc_auth *auth = ds->ds_clp->cl_rpcclient->cl_auth; 314 struct rpc_cred *cred; 315 struct auth_cred acred = { 316 .uid = make_kuid(&init_user_ns, mirror->uid), 317 .gid = make_kgid(&init_user_ns, mirror->gid), 318 }; 319 320 /* AUTH_NULL ignores acred */ 321 cred = auth->au_ops->lookup_cred(auth, &acred, 0); 322 if (IS_ERR(cred)) { 323 dprintk("%s: lookup_cred failed with %ld\n", 324 __func__, PTR_ERR(cred)); 325 return PTR_ERR(cred); 326 } else { 327 if (cmpxchg(&mirror->cred, NULL, cred)) 328 put_rpccred(cred); 329 } 330 } 331 return 0; 332 } 333 334 struct nfs_fh * 335 nfs4_ff_layout_select_ds_fh(struct pnfs_layout_segment *lseg, u32 mirror_idx) 336 { 337 struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, mirror_idx); 338 struct nfs_fh *fh = NULL; 339 struct nfs4_deviceid_node *devid; 340 341 if (mirror == NULL || mirror->mirror_ds == NULL || 342 mirror->mirror_ds->ds == NULL) { 343 printk(KERN_ERR "NFS: %s: No data server for mirror offset index %d\n", 344 __func__, mirror_idx); 345 if (mirror && mirror->mirror_ds) { 346 devid = &mirror->mirror_ds->id_node; 347 pnfs_generic_mark_devid_invalid(devid); 348 } 349 goto out; 350 } 351 352 /* FIXME: For now assume there is only 1 version available for the DS */ 353 fh = &mirror->fh_versions[0]; 354 out: 355 return fh; 356 } 357 358 /* Upon return, either ds is connected, or ds is NULL */ 359 struct nfs4_pnfs_ds * 360 nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx, 361 bool fail_return) 362 { 363 struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx); 364 struct nfs4_pnfs_ds *ds = NULL; 365 struct nfs4_deviceid_node *devid; 366 struct inode *ino = lseg->pls_layout->plh_inode; 367 struct nfs_server *s = NFS_SERVER(ino); 368 unsigned int max_payload; 369 rpc_authflavor_t flavor; 370 371 if (mirror == NULL || mirror->mirror_ds == NULL || 372 mirror->mirror_ds->ds == NULL) { 373 printk(KERN_ERR "NFS: %s: No data server for offset index %d\n", 374 __func__, ds_idx); 375 if (mirror && mirror->mirror_ds) { 376 devid = &mirror->mirror_ds->id_node; 377 pnfs_generic_mark_devid_invalid(devid); 378 } 379 goto out; 380 } 381 382 devid = &mirror->mirror_ds->id_node; 383 if (ff_layout_test_devid_unavailable(devid)) 384 goto out; 385 386 ds = mirror->mirror_ds->ds; 387 /* matching smp_wmb() in _nfs4_pnfs_v3/4_ds_connect */ 388 smp_rmb(); 389 if (ds->ds_clp) 390 goto out_update_creds; 391 392 flavor = nfs4_ff_layout_choose_authflavor(mirror); 393 394 /* FIXME: For now we assume the server sent only one version of NFS 395 * to use for the DS. 396 */ 397 nfs4_pnfs_ds_connect(s, ds, devid, dataserver_timeo, 398 dataserver_retrans, 399 mirror->mirror_ds->ds_versions[0].version, 400 mirror->mirror_ds->ds_versions[0].minor_version, 401 flavor); 402 403 /* connect success, check rsize/wsize limit */ 404 if (ds->ds_clp) { 405 max_payload = 406 nfs_block_size(rpc_max_payload(ds->ds_clp->cl_rpcclient), 407 NULL); 408 if (mirror->mirror_ds->ds_versions[0].rsize > max_payload) 409 mirror->mirror_ds->ds_versions[0].rsize = max_payload; 410 if (mirror->mirror_ds->ds_versions[0].wsize > max_payload) 411 mirror->mirror_ds->ds_versions[0].wsize = max_payload; 412 } else { 413 ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout), 414 mirror, lseg->pls_range.offset, 415 lseg->pls_range.length, NFS4ERR_NXIO, 416 OP_ILLEGAL, GFP_NOIO); 417 if (fail_return) { 418 pnfs_error_mark_layout_for_return(ino, lseg); 419 if (ff_layout_has_available_ds(lseg)) 420 pnfs_set_retry_layoutget(lseg->pls_layout); 421 else 422 pnfs_clear_retry_layoutget(lseg->pls_layout); 423 424 } else { 425 if (ff_layout_has_available_ds(lseg)) 426 set_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE, 427 &lseg->pls_layout->plh_flags); 428 else { 429 pnfs_error_mark_layout_for_return(ino, lseg); 430 pnfs_clear_retry_layoutget(lseg->pls_layout); 431 } 432 } 433 } 434 out_update_creds: 435 if (ff_layout_update_mirror_cred(mirror, ds)) 436 ds = NULL; 437 out: 438 return ds; 439 } 440 441 struct rpc_cred * 442 ff_layout_get_ds_cred(struct pnfs_layout_segment *lseg, u32 ds_idx, 443 struct rpc_cred *mdscred) 444 { 445 struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx); 446 struct rpc_cred *cred = ERR_PTR(-EINVAL); 447 448 if (!nfs4_ff_layout_prepare_ds(lseg, ds_idx, true)) 449 goto out; 450 451 if (mirror && mirror->cred) 452 cred = mirror->cred; 453 else 454 cred = mdscred; 455 out: 456 return cred; 457 } 458 459 /** 460 * Find or create a DS rpc client with th MDS server rpc client auth flavor 461 * in the nfs_client cl_ds_clients list. 462 */ 463 struct rpc_clnt * 464 nfs4_ff_find_or_create_ds_client(struct pnfs_layout_segment *lseg, u32 ds_idx, 465 struct nfs_client *ds_clp, struct inode *inode) 466 { 467 struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx); 468 469 switch (mirror->mirror_ds->ds_versions[0].version) { 470 case 3: 471 /* For NFSv3 DS, flavor is set when creating DS connections */ 472 return ds_clp->cl_rpcclient; 473 case 4: 474 return nfs4_find_or_create_ds_client(ds_clp, inode); 475 default: 476 BUG(); 477 } 478 } 479 480 static bool is_range_intersecting(u64 offset1, u64 length1, 481 u64 offset2, u64 length2) 482 { 483 u64 end1 = end_offset(offset1, length1); 484 u64 end2 = end_offset(offset2, length2); 485 486 return (end1 == NFS4_MAX_UINT64 || end1 > offset2) && 487 (end2 == NFS4_MAX_UINT64 || end2 > offset1); 488 } 489 490 /* called with inode i_lock held */ 491 int ff_layout_encode_ds_ioerr(struct nfs4_flexfile_layout *flo, 492 struct xdr_stream *xdr, int *count, 493 const struct pnfs_layout_range *range) 494 { 495 struct nfs4_ff_layout_ds_err *err, *n; 496 __be32 *p; 497 498 list_for_each_entry_safe(err, n, &flo->error_list, list) { 499 if (!is_range_intersecting(err->offset, err->length, 500 range->offset, range->length)) 501 continue; 502 /* offset(8) + length(8) + stateid(NFS4_STATEID_SIZE) 503 * + deviceid(NFS4_DEVICEID4_SIZE) + status(4) + opnum(4) 504 */ 505 p = xdr_reserve_space(xdr, 506 24 + NFS4_STATEID_SIZE + NFS4_DEVICEID4_SIZE); 507 if (unlikely(!p)) 508 return -ENOBUFS; 509 p = xdr_encode_hyper(p, err->offset); 510 p = xdr_encode_hyper(p, err->length); 511 p = xdr_encode_opaque_fixed(p, &err->stateid, 512 NFS4_STATEID_SIZE); 513 p = xdr_encode_opaque_fixed(p, &err->deviceid, 514 NFS4_DEVICEID4_SIZE); 515 *p++ = cpu_to_be32(err->status); 516 *p++ = cpu_to_be32(err->opnum); 517 *count += 1; 518 list_del(&err->list); 519 dprintk("%s: offset %llu length %llu status %d op %d count %d\n", 520 __func__, err->offset, err->length, err->status, 521 err->opnum, *count); 522 kfree(err); 523 } 524 525 return 0; 526 } 527 528 bool ff_layout_has_available_ds(struct pnfs_layout_segment *lseg) 529 { 530 struct nfs4_ff_layout_mirror *mirror; 531 struct nfs4_deviceid_node *devid; 532 int idx; 533 534 for (idx = 0; idx < FF_LAYOUT_MIRROR_COUNT(lseg); idx++) { 535 mirror = FF_LAYOUT_COMP(lseg, idx); 536 if (mirror && mirror->mirror_ds) { 537 devid = &mirror->mirror_ds->id_node; 538 if (!ff_layout_test_devid_unavailable(devid)) 539 return true; 540 } 541 } 542 543 return false; 544 } 545 546 module_param(dataserver_retrans, uint, 0644); 547 MODULE_PARM_DESC(dataserver_retrans, "The number of times the NFSv4.1 client " 548 "retries a request before it attempts further " 549 " recovery action."); 550 module_param(dataserver_timeo, uint, 0644); 551 MODULE_PARM_DESC(dataserver_timeo, "The time (in tenths of a second) the " 552 "NFSv4.1 client waits for a response from a " 553 " data server before it retries an NFS request."); 554