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 mirror->cred = cred; 328 } 329 } 330 return 0; 331 } 332 333 struct nfs_fh * 334 nfs4_ff_layout_select_ds_fh(struct pnfs_layout_segment *lseg, u32 mirror_idx) 335 { 336 struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, mirror_idx); 337 struct nfs_fh *fh = NULL; 338 struct nfs4_deviceid_node *devid; 339 340 if (mirror == NULL || mirror->mirror_ds == NULL || 341 mirror->mirror_ds->ds == NULL) { 342 printk(KERN_ERR "NFS: %s: No data server for mirror offset index %d\n", 343 __func__, mirror_idx); 344 if (mirror && mirror->mirror_ds) { 345 devid = &mirror->mirror_ds->id_node; 346 pnfs_generic_mark_devid_invalid(devid); 347 } 348 goto out; 349 } 350 351 /* FIXME: For now assume there is only 1 version available for the DS */ 352 fh = &mirror->fh_versions[0]; 353 out: 354 return fh; 355 } 356 357 /* Upon return, either ds is connected, or ds is NULL */ 358 struct nfs4_pnfs_ds * 359 nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx, 360 bool fail_return) 361 { 362 struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx); 363 struct nfs4_pnfs_ds *ds = NULL; 364 struct nfs4_deviceid_node *devid; 365 struct inode *ino = lseg->pls_layout->plh_inode; 366 struct nfs_server *s = NFS_SERVER(ino); 367 unsigned int max_payload; 368 rpc_authflavor_t flavor; 369 370 if (mirror == NULL || mirror->mirror_ds == NULL || 371 mirror->mirror_ds->ds == NULL) { 372 printk(KERN_ERR "NFS: %s: No data server for offset index %d\n", 373 __func__, ds_idx); 374 if (mirror && mirror->mirror_ds) { 375 devid = &mirror->mirror_ds->id_node; 376 pnfs_generic_mark_devid_invalid(devid); 377 } 378 goto out; 379 } 380 381 devid = &mirror->mirror_ds->id_node; 382 if (ff_layout_test_devid_unavailable(devid)) 383 goto out; 384 385 ds = mirror->mirror_ds->ds; 386 /* matching smp_wmb() in _nfs4_pnfs_v3/4_ds_connect */ 387 smp_rmb(); 388 if (ds->ds_clp) 389 goto out; 390 391 flavor = nfs4_ff_layout_choose_authflavor(mirror); 392 393 /* FIXME: For now we assume the server sent only one version of NFS 394 * to use for the DS. 395 */ 396 nfs4_pnfs_ds_connect(s, ds, devid, dataserver_timeo, 397 dataserver_retrans, 398 mirror->mirror_ds->ds_versions[0].version, 399 mirror->mirror_ds->ds_versions[0].minor_version, 400 flavor); 401 402 /* connect success, check rsize/wsize limit */ 403 if (ds->ds_clp) { 404 max_payload = 405 nfs_block_size(rpc_max_payload(ds->ds_clp->cl_rpcclient), 406 NULL); 407 if (mirror->mirror_ds->ds_versions[0].rsize > max_payload) 408 mirror->mirror_ds->ds_versions[0].rsize = max_payload; 409 if (mirror->mirror_ds->ds_versions[0].wsize > max_payload) 410 mirror->mirror_ds->ds_versions[0].wsize = max_payload; 411 } else { 412 ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout), 413 mirror, lseg->pls_range.offset, 414 lseg->pls_range.length, NFS4ERR_NXIO, 415 OP_ILLEGAL, GFP_NOIO); 416 if (fail_return) { 417 pnfs_error_mark_layout_for_return(ino, lseg); 418 if (ff_layout_has_available_ds(lseg)) 419 pnfs_set_retry_layoutget(lseg->pls_layout); 420 else 421 pnfs_clear_retry_layoutget(lseg->pls_layout); 422 423 } else { 424 if (ff_layout_has_available_ds(lseg)) 425 set_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE, 426 &lseg->pls_layout->plh_flags); 427 else { 428 pnfs_error_mark_layout_for_return(ino, lseg); 429 pnfs_clear_retry_layoutget(lseg->pls_layout); 430 } 431 } 432 } 433 434 if (ff_layout_update_mirror_cred(mirror, ds)) 435 ds = NULL; 436 out: 437 return ds; 438 } 439 440 struct rpc_cred * 441 ff_layout_get_ds_cred(struct pnfs_layout_segment *lseg, u32 ds_idx, 442 struct rpc_cred *mdscred) 443 { 444 struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx); 445 struct rpc_cred *cred = ERR_PTR(-EINVAL); 446 447 if (!nfs4_ff_layout_prepare_ds(lseg, ds_idx, true)) 448 goto out; 449 450 if (mirror && mirror->cred) 451 cred = mirror->cred; 452 else 453 cred = mdscred; 454 out: 455 return cred; 456 } 457 458 /** 459 * Find or create a DS rpc client with th MDS server rpc client auth flavor 460 * in the nfs_client cl_ds_clients list. 461 */ 462 struct rpc_clnt * 463 nfs4_ff_find_or_create_ds_client(struct pnfs_layout_segment *lseg, u32 ds_idx, 464 struct nfs_client *ds_clp, struct inode *inode) 465 { 466 struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx); 467 468 switch (mirror->mirror_ds->ds_versions[0].version) { 469 case 3: 470 /* For NFSv3 DS, flavor is set when creating DS connections */ 471 return ds_clp->cl_rpcclient; 472 case 4: 473 return nfs4_find_or_create_ds_client(ds_clp, inode); 474 default: 475 BUG(); 476 } 477 } 478 479 static bool is_range_intersecting(u64 offset1, u64 length1, 480 u64 offset2, u64 length2) 481 { 482 u64 end1 = end_offset(offset1, length1); 483 u64 end2 = end_offset(offset2, length2); 484 485 return (end1 == NFS4_MAX_UINT64 || end1 > offset2) && 486 (end2 == NFS4_MAX_UINT64 || end2 > offset1); 487 } 488 489 /* called with inode i_lock held */ 490 int ff_layout_encode_ds_ioerr(struct nfs4_flexfile_layout *flo, 491 struct xdr_stream *xdr, int *count, 492 const struct pnfs_layout_range *range) 493 { 494 struct nfs4_ff_layout_ds_err *err, *n; 495 __be32 *p; 496 497 list_for_each_entry_safe(err, n, &flo->error_list, list) { 498 if (!is_range_intersecting(err->offset, err->length, 499 range->offset, range->length)) 500 continue; 501 /* offset(8) + length(8) + stateid(NFS4_STATEID_SIZE) 502 * + deviceid(NFS4_DEVICEID4_SIZE) + status(4) + opnum(4) 503 */ 504 p = xdr_reserve_space(xdr, 505 24 + NFS4_STATEID_SIZE + NFS4_DEVICEID4_SIZE); 506 if (unlikely(!p)) 507 return -ENOBUFS; 508 p = xdr_encode_hyper(p, err->offset); 509 p = xdr_encode_hyper(p, err->length); 510 p = xdr_encode_opaque_fixed(p, &err->stateid, 511 NFS4_STATEID_SIZE); 512 p = xdr_encode_opaque_fixed(p, &err->deviceid, 513 NFS4_DEVICEID4_SIZE); 514 *p++ = cpu_to_be32(err->status); 515 *p++ = cpu_to_be32(err->opnum); 516 *count += 1; 517 list_del(&err->list); 518 dprintk("%s: offset %llu length %llu status %d op %d count %d\n", 519 __func__, err->offset, err->length, err->status, 520 err->opnum, *count); 521 kfree(err); 522 } 523 524 return 0; 525 } 526 527 bool ff_layout_has_available_ds(struct pnfs_layout_segment *lseg) 528 { 529 struct nfs4_ff_layout_mirror *mirror; 530 struct nfs4_deviceid_node *devid; 531 int idx; 532 533 for (idx = 0; idx < FF_LAYOUT_MIRROR_COUNT(lseg); idx++) { 534 mirror = FF_LAYOUT_COMP(lseg, idx); 535 if (mirror && mirror->mirror_ds) { 536 devid = &mirror->mirror_ds->id_node; 537 if (!ff_layout_test_devid_unavailable(devid)) 538 return true; 539 } 540 } 541 542 return false; 543 } 544 545 module_param(dataserver_retrans, uint, 0644); 546 MODULE_PARM_DESC(dataserver_retrans, "The number of times the NFSv4.1 client " 547 "retries a request before it attempts further " 548 " recovery action."); 549 module_param(dataserver_timeo, uint, 0644); 550 MODULE_PARM_DESC(dataserver_timeo, "The time (in tenths of a second) the " 551 "NFSv4.1 client waits for a response from a " 552 " data server before it retries an NFS request."); 553