1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2014 Anna Schumaker <Anna.Schumaker@Netapp.com> 4 */ 5 #include <linux/fs.h> 6 #include <linux/sunrpc/addr.h> 7 #include <linux/sunrpc/sched.h> 8 #include <linux/nfs.h> 9 #include <linux/nfs3.h> 10 #include <linux/nfs4.h> 11 #include <linux/nfs_xdr.h> 12 #include <linux/nfs_fs.h> 13 #include "nfs4_fs.h" 14 #include "nfs42.h" 15 #include "iostat.h" 16 #include "pnfs.h" 17 #include "nfs4session.h" 18 #include "internal.h" 19 #include "delegation.h" 20 #include "nfs4trace.h" 21 22 #define NFSDBG_FACILITY NFSDBG_PROC 23 static int nfs42_do_offload_cancel_async(struct file *dst, nfs4_stateid *std); 24 25 static void nfs42_set_netaddr(struct file *filep, struct nfs42_netaddr *naddr) 26 { 27 struct nfs_client *clp = (NFS_SERVER(file_inode(filep)))->nfs_client; 28 unsigned short port = 2049; 29 30 rcu_read_lock(); 31 naddr->netid_len = scnprintf(naddr->netid, 32 sizeof(naddr->netid), "%s", 33 rpc_peeraddr2str(clp->cl_rpcclient, 34 RPC_DISPLAY_NETID)); 35 naddr->addr_len = scnprintf(naddr->addr, 36 sizeof(naddr->addr), 37 "%s.%u.%u", 38 rpc_peeraddr2str(clp->cl_rpcclient, 39 RPC_DISPLAY_ADDR), 40 port >> 8, port & 255); 41 rcu_read_unlock(); 42 } 43 44 static int _nfs42_proc_fallocate(struct rpc_message *msg, struct file *filep, 45 struct nfs_lock_context *lock, loff_t offset, loff_t len) 46 { 47 struct inode *inode = file_inode(filep); 48 struct nfs_server *server = NFS_SERVER(inode); 49 u32 bitmask[3]; 50 struct nfs42_falloc_args args = { 51 .falloc_fh = NFS_FH(inode), 52 .falloc_offset = offset, 53 .falloc_length = len, 54 .falloc_bitmask = bitmask, 55 }; 56 struct nfs42_falloc_res res = { 57 .falloc_server = server, 58 }; 59 int status; 60 61 msg->rpc_argp = &args; 62 msg->rpc_resp = &res; 63 64 status = nfs4_set_rw_stateid(&args.falloc_stateid, lock->open_context, 65 lock, FMODE_WRITE); 66 if (status) { 67 if (status == -EAGAIN) 68 status = -NFS4ERR_BAD_STATEID; 69 return status; 70 } 71 72 memcpy(bitmask, server->cache_consistency_bitmask, sizeof(bitmask)); 73 if (server->attr_bitmask[1] & FATTR4_WORD1_SPACE_USED) 74 bitmask[1] |= FATTR4_WORD1_SPACE_USED; 75 76 res.falloc_fattr = nfs_alloc_fattr(); 77 if (!res.falloc_fattr) 78 return -ENOMEM; 79 80 status = nfs4_call_sync(server->client, server, msg, 81 &args.seq_args, &res.seq_res, 0); 82 if (status == 0) 83 status = nfs_post_op_update_inode_force_wcc(inode, 84 res.falloc_fattr); 85 86 if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_ALLOCATE]) 87 trace_nfs4_fallocate(inode, &args, status); 88 else 89 trace_nfs4_deallocate(inode, &args, status); 90 kfree(res.falloc_fattr); 91 return status; 92 } 93 94 static int nfs42_proc_fallocate(struct rpc_message *msg, struct file *filep, 95 loff_t offset, loff_t len) 96 { 97 struct inode *inode = file_inode(filep); 98 struct nfs_server *server = NFS_SERVER(inode); 99 struct nfs4_exception exception = { }; 100 struct nfs_lock_context *lock; 101 int err; 102 103 lock = nfs_get_lock_context(nfs_file_open_context(filep)); 104 if (IS_ERR(lock)) 105 return PTR_ERR(lock); 106 107 exception.inode = inode; 108 exception.state = lock->open_context->state; 109 110 err = nfs_sync_inode(inode); 111 if (err) 112 goto out; 113 114 do { 115 err = _nfs42_proc_fallocate(msg, filep, lock, offset, len); 116 if (err == -ENOTSUPP) { 117 err = -EOPNOTSUPP; 118 break; 119 } 120 err = nfs4_handle_exception(server, err, &exception); 121 } while (exception.retry); 122 out: 123 nfs_put_lock_context(lock); 124 return err; 125 } 126 127 int nfs42_proc_allocate(struct file *filep, loff_t offset, loff_t len) 128 { 129 struct rpc_message msg = { 130 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ALLOCATE], 131 }; 132 struct inode *inode = file_inode(filep); 133 int err; 134 135 if (!nfs_server_capable(inode, NFS_CAP_ALLOCATE)) 136 return -EOPNOTSUPP; 137 138 inode_lock(inode); 139 140 err = nfs42_proc_fallocate(&msg, filep, offset, len); 141 if (err == -EOPNOTSUPP) 142 NFS_SERVER(inode)->caps &= ~NFS_CAP_ALLOCATE; 143 144 inode_unlock(inode); 145 return err; 146 } 147 148 int nfs42_proc_deallocate(struct file *filep, loff_t offset, loff_t len) 149 { 150 struct rpc_message msg = { 151 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DEALLOCATE], 152 }; 153 struct inode *inode = file_inode(filep); 154 int err; 155 156 if (!nfs_server_capable(inode, NFS_CAP_DEALLOCATE)) 157 return -EOPNOTSUPP; 158 159 inode_lock(inode); 160 161 err = nfs42_proc_fallocate(&msg, filep, offset, len); 162 if (err == 0) 163 truncate_pagecache_range(inode, offset, (offset + len) -1); 164 if (err == -EOPNOTSUPP) 165 NFS_SERVER(inode)->caps &= ~NFS_CAP_DEALLOCATE; 166 167 inode_unlock(inode); 168 return err; 169 } 170 171 static int handle_async_copy(struct nfs42_copy_res *res, 172 struct nfs_server *dst_server, 173 struct nfs_server *src_server, 174 struct file *src, 175 struct file *dst, 176 nfs4_stateid *src_stateid, 177 bool *restart) 178 { 179 struct nfs4_copy_state *copy, *tmp_copy; 180 int status = NFS4_OK; 181 bool found_pending = false; 182 struct nfs_open_context *dst_ctx = nfs_file_open_context(dst); 183 struct nfs_open_context *src_ctx = nfs_file_open_context(src); 184 185 copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_NOFS); 186 if (!copy) 187 return -ENOMEM; 188 189 spin_lock(&dst_server->nfs_client->cl_lock); 190 list_for_each_entry(tmp_copy, 191 &dst_server->nfs_client->pending_cb_stateids, 192 copies) { 193 if (memcmp(&res->write_res.stateid, &tmp_copy->stateid, 194 NFS4_STATEID_SIZE)) 195 continue; 196 found_pending = true; 197 list_del(&tmp_copy->copies); 198 break; 199 } 200 if (found_pending) { 201 spin_unlock(&dst_server->nfs_client->cl_lock); 202 kfree(copy); 203 copy = tmp_copy; 204 goto out; 205 } 206 207 memcpy(©->stateid, &res->write_res.stateid, NFS4_STATEID_SIZE); 208 init_completion(©->completion); 209 copy->parent_dst_state = dst_ctx->state; 210 copy->parent_src_state = src_ctx->state; 211 212 list_add_tail(©->copies, &dst_server->ss_copies); 213 spin_unlock(&dst_server->nfs_client->cl_lock); 214 215 if (dst_server != src_server) { 216 spin_lock(&src_server->nfs_client->cl_lock); 217 list_add_tail(©->src_copies, &src_server->ss_copies); 218 spin_unlock(&src_server->nfs_client->cl_lock); 219 } 220 221 status = wait_for_completion_interruptible(©->completion); 222 spin_lock(&dst_server->nfs_client->cl_lock); 223 list_del_init(©->copies); 224 spin_unlock(&dst_server->nfs_client->cl_lock); 225 if (dst_server != src_server) { 226 spin_lock(&src_server->nfs_client->cl_lock); 227 list_del_init(©->src_copies); 228 spin_unlock(&src_server->nfs_client->cl_lock); 229 } 230 if (status == -ERESTARTSYS) { 231 goto out_cancel; 232 } else if (copy->flags || copy->error == NFS4ERR_PARTNER_NO_AUTH) { 233 status = -EAGAIN; 234 *restart = true; 235 goto out_cancel; 236 } 237 out: 238 res->write_res.count = copy->count; 239 memcpy(&res->write_res.verifier, ©->verf, sizeof(copy->verf)); 240 status = -copy->error; 241 242 out_free: 243 kfree(copy); 244 return status; 245 out_cancel: 246 nfs42_do_offload_cancel_async(dst, ©->stateid); 247 if (!nfs42_files_from_same_server(src, dst)) 248 nfs42_do_offload_cancel_async(src, src_stateid); 249 goto out_free; 250 } 251 252 static int process_copy_commit(struct file *dst, loff_t pos_dst, 253 struct nfs42_copy_res *res) 254 { 255 struct nfs_commitres cres; 256 int status = -ENOMEM; 257 258 cres.verf = kzalloc(sizeof(struct nfs_writeverf), GFP_NOFS); 259 if (!cres.verf) 260 goto out; 261 262 status = nfs4_proc_commit(dst, pos_dst, res->write_res.count, &cres); 263 if (status) 264 goto out_free; 265 if (nfs_write_verifier_cmp(&res->write_res.verifier.verifier, 266 &cres.verf->verifier)) { 267 dprintk("commit verf differs from copy verf\n"); 268 status = -EAGAIN; 269 } 270 out_free: 271 kfree(cres.verf); 272 out: 273 return status; 274 } 275 276 /** 277 * nfs42_copy_dest_done - perform inode cache updates after clone/copy offload 278 * @inode: pointer to destination inode 279 * @pos: destination offset 280 * @len: copy length 281 * 282 * Punch a hole in the inode page cache, so that the NFS client will 283 * know to retrieve new data. 284 * Update the file size if necessary, and then mark the inode as having 285 * invalid cached values for change attribute, ctime, mtime and space used. 286 */ 287 static void nfs42_copy_dest_done(struct inode *inode, loff_t pos, loff_t len) 288 { 289 loff_t newsize = pos + len; 290 loff_t end = newsize - 1; 291 292 truncate_pagecache_range(inode, pos, end); 293 spin_lock(&inode->i_lock); 294 if (newsize > i_size_read(inode)) 295 i_size_write(inode, newsize); 296 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE | 297 NFS_INO_INVALID_CTIME | 298 NFS_INO_INVALID_MTIME | 299 NFS_INO_INVALID_BLOCKS); 300 spin_unlock(&inode->i_lock); 301 } 302 303 static ssize_t _nfs42_proc_copy(struct file *src, 304 struct nfs_lock_context *src_lock, 305 struct file *dst, 306 struct nfs_lock_context *dst_lock, 307 struct nfs42_copy_args *args, 308 struct nfs42_copy_res *res, 309 struct nl4_server *nss, 310 nfs4_stateid *cnr_stateid, 311 bool *restart) 312 { 313 struct rpc_message msg = { 314 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COPY], 315 .rpc_argp = args, 316 .rpc_resp = res, 317 }; 318 struct inode *dst_inode = file_inode(dst); 319 struct inode *src_inode = file_inode(src); 320 struct nfs_server *dst_server = NFS_SERVER(dst_inode); 321 struct nfs_server *src_server = NFS_SERVER(src_inode); 322 loff_t pos_src = args->src_pos; 323 loff_t pos_dst = args->dst_pos; 324 size_t count = args->count; 325 ssize_t status; 326 327 if (nss) { 328 args->cp_src = nss; 329 nfs4_stateid_copy(&args->src_stateid, cnr_stateid); 330 } else { 331 status = nfs4_set_rw_stateid(&args->src_stateid, 332 src_lock->open_context, src_lock, FMODE_READ); 333 if (status) { 334 if (status == -EAGAIN) 335 status = -NFS4ERR_BAD_STATEID; 336 return status; 337 } 338 } 339 status = nfs_filemap_write_and_wait_range(file_inode(src)->i_mapping, 340 pos_src, pos_src + (loff_t)count - 1); 341 if (status) 342 return status; 343 344 status = nfs4_set_rw_stateid(&args->dst_stateid, dst_lock->open_context, 345 dst_lock, FMODE_WRITE); 346 if (status) { 347 if (status == -EAGAIN) 348 status = -NFS4ERR_BAD_STATEID; 349 return status; 350 } 351 352 status = nfs_sync_inode(dst_inode); 353 if (status) 354 return status; 355 356 res->commit_res.verf = NULL; 357 if (args->sync) { 358 res->commit_res.verf = 359 kzalloc(sizeof(struct nfs_writeverf), GFP_NOFS); 360 if (!res->commit_res.verf) 361 return -ENOMEM; 362 } 363 set_bit(NFS_CLNT_SRC_SSC_COPY_STATE, 364 &src_lock->open_context->state->flags); 365 set_bit(NFS_CLNT_DST_SSC_COPY_STATE, 366 &dst_lock->open_context->state->flags); 367 368 status = nfs4_call_sync(dst_server->client, dst_server, &msg, 369 &args->seq_args, &res->seq_res, 0); 370 if (status == -ENOTSUPP) 371 dst_server->caps &= ~NFS_CAP_COPY; 372 if (status) 373 goto out; 374 375 if (args->sync && 376 nfs_write_verifier_cmp(&res->write_res.verifier.verifier, 377 &res->commit_res.verf->verifier)) { 378 status = -EAGAIN; 379 goto out; 380 } 381 382 if (!res->synchronous) { 383 status = handle_async_copy(res, dst_server, src_server, src, 384 dst, &args->src_stateid, restart); 385 if (status) 386 goto out; 387 } 388 389 if ((!res->synchronous || !args->sync) && 390 res->write_res.verifier.committed != NFS_FILE_SYNC) { 391 status = process_copy_commit(dst, pos_dst, res); 392 if (status) 393 goto out; 394 } 395 396 nfs42_copy_dest_done(dst_inode, pos_dst, res->write_res.count); 397 nfs_invalidate_atime(src_inode); 398 status = res->write_res.count; 399 out: 400 if (args->sync) 401 kfree(res->commit_res.verf); 402 return status; 403 } 404 405 ssize_t nfs42_proc_copy(struct file *src, loff_t pos_src, 406 struct file *dst, loff_t pos_dst, size_t count, 407 struct nl4_server *nss, 408 nfs4_stateid *cnr_stateid, bool sync) 409 { 410 struct nfs_server *server = NFS_SERVER(file_inode(dst)); 411 struct nfs_lock_context *src_lock; 412 struct nfs_lock_context *dst_lock; 413 struct nfs42_copy_args args = { 414 .src_fh = NFS_FH(file_inode(src)), 415 .src_pos = pos_src, 416 .dst_fh = NFS_FH(file_inode(dst)), 417 .dst_pos = pos_dst, 418 .count = count, 419 .sync = sync, 420 }; 421 struct nfs42_copy_res res; 422 struct nfs4_exception src_exception = { 423 .inode = file_inode(src), 424 .stateid = &args.src_stateid, 425 }; 426 struct nfs4_exception dst_exception = { 427 .inode = file_inode(dst), 428 .stateid = &args.dst_stateid, 429 }; 430 ssize_t err, err2; 431 bool restart = false; 432 433 src_lock = nfs_get_lock_context(nfs_file_open_context(src)); 434 if (IS_ERR(src_lock)) 435 return PTR_ERR(src_lock); 436 437 src_exception.state = src_lock->open_context->state; 438 439 dst_lock = nfs_get_lock_context(nfs_file_open_context(dst)); 440 if (IS_ERR(dst_lock)) { 441 err = PTR_ERR(dst_lock); 442 goto out_put_src_lock; 443 } 444 445 dst_exception.state = dst_lock->open_context->state; 446 447 do { 448 inode_lock(file_inode(dst)); 449 err = _nfs42_proc_copy(src, src_lock, 450 dst, dst_lock, 451 &args, &res, 452 nss, cnr_stateid, &restart); 453 inode_unlock(file_inode(dst)); 454 455 if (err >= 0) 456 break; 457 if (err == -ENOTSUPP && 458 nfs42_files_from_same_server(src, dst)) { 459 err = -EOPNOTSUPP; 460 break; 461 } else if (err == -EAGAIN) { 462 if (!restart) { 463 dst_exception.retry = 1; 464 continue; 465 } 466 break; 467 } else if (err == -NFS4ERR_OFFLOAD_NO_REQS && !args.sync) { 468 args.sync = true; 469 dst_exception.retry = 1; 470 continue; 471 } else if ((err == -ESTALE || 472 err == -NFS4ERR_OFFLOAD_DENIED || 473 err == -ENOTSUPP) && 474 !nfs42_files_from_same_server(src, dst)) { 475 nfs42_do_offload_cancel_async(src, &args.src_stateid); 476 err = -EOPNOTSUPP; 477 break; 478 } 479 480 err2 = nfs4_handle_exception(server, err, &src_exception); 481 err = nfs4_handle_exception(server, err, &dst_exception); 482 if (!err) 483 err = err2; 484 } while (src_exception.retry || dst_exception.retry); 485 486 nfs_put_lock_context(dst_lock); 487 out_put_src_lock: 488 nfs_put_lock_context(src_lock); 489 return err; 490 } 491 492 struct nfs42_offloadcancel_data { 493 struct nfs_server *seq_server; 494 struct nfs42_offload_status_args args; 495 struct nfs42_offload_status_res res; 496 }; 497 498 static void nfs42_offload_cancel_prepare(struct rpc_task *task, void *calldata) 499 { 500 struct nfs42_offloadcancel_data *data = calldata; 501 502 nfs4_setup_sequence(data->seq_server->nfs_client, 503 &data->args.osa_seq_args, 504 &data->res.osr_seq_res, task); 505 } 506 507 static void nfs42_offload_cancel_done(struct rpc_task *task, void *calldata) 508 { 509 struct nfs42_offloadcancel_data *data = calldata; 510 511 nfs41_sequence_done(task, &data->res.osr_seq_res); 512 if (task->tk_status && 513 nfs4_async_handle_error(task, data->seq_server, NULL, 514 NULL) == -EAGAIN) 515 rpc_restart_call_prepare(task); 516 } 517 518 static void nfs42_free_offloadcancel_data(void *data) 519 { 520 kfree(data); 521 } 522 523 static const struct rpc_call_ops nfs42_offload_cancel_ops = { 524 .rpc_call_prepare = nfs42_offload_cancel_prepare, 525 .rpc_call_done = nfs42_offload_cancel_done, 526 .rpc_release = nfs42_free_offloadcancel_data, 527 }; 528 529 static int nfs42_do_offload_cancel_async(struct file *dst, 530 nfs4_stateid *stateid) 531 { 532 struct nfs_server *dst_server = NFS_SERVER(file_inode(dst)); 533 struct nfs42_offloadcancel_data *data = NULL; 534 struct nfs_open_context *ctx = nfs_file_open_context(dst); 535 struct rpc_task *task; 536 struct rpc_message msg = { 537 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OFFLOAD_CANCEL], 538 .rpc_cred = ctx->cred, 539 }; 540 struct rpc_task_setup task_setup_data = { 541 .rpc_client = dst_server->client, 542 .rpc_message = &msg, 543 .callback_ops = &nfs42_offload_cancel_ops, 544 .workqueue = nfsiod_workqueue, 545 .flags = RPC_TASK_ASYNC, 546 }; 547 int status; 548 549 if (!(dst_server->caps & NFS_CAP_OFFLOAD_CANCEL)) 550 return -EOPNOTSUPP; 551 552 data = kzalloc(sizeof(struct nfs42_offloadcancel_data), GFP_NOFS); 553 if (data == NULL) 554 return -ENOMEM; 555 556 data->seq_server = dst_server; 557 data->args.osa_src_fh = NFS_FH(file_inode(dst)); 558 memcpy(&data->args.osa_stateid, stateid, 559 sizeof(data->args.osa_stateid)); 560 msg.rpc_argp = &data->args; 561 msg.rpc_resp = &data->res; 562 task_setup_data.callback_data = data; 563 nfs4_init_sequence(&data->args.osa_seq_args, &data->res.osr_seq_res, 564 1, 0); 565 task = rpc_run_task(&task_setup_data); 566 if (IS_ERR(task)) 567 return PTR_ERR(task); 568 status = rpc_wait_for_completion_task(task); 569 if (status == -ENOTSUPP) 570 dst_server->caps &= ~NFS_CAP_OFFLOAD_CANCEL; 571 rpc_put_task(task); 572 return status; 573 } 574 575 static int _nfs42_proc_copy_notify(struct file *src, struct file *dst, 576 struct nfs42_copy_notify_args *args, 577 struct nfs42_copy_notify_res *res) 578 { 579 struct nfs_server *src_server = NFS_SERVER(file_inode(src)); 580 struct rpc_message msg = { 581 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COPY_NOTIFY], 582 .rpc_argp = args, 583 .rpc_resp = res, 584 }; 585 int status; 586 struct nfs_open_context *ctx; 587 struct nfs_lock_context *l_ctx; 588 589 ctx = get_nfs_open_context(nfs_file_open_context(src)); 590 l_ctx = nfs_get_lock_context(ctx); 591 if (IS_ERR(l_ctx)) 592 return PTR_ERR(l_ctx); 593 594 status = nfs4_set_rw_stateid(&args->cna_src_stateid, ctx, l_ctx, 595 FMODE_READ); 596 nfs_put_lock_context(l_ctx); 597 if (status) { 598 if (status == -EAGAIN) 599 status = -NFS4ERR_BAD_STATEID; 600 return status; 601 } 602 603 status = nfs4_call_sync(src_server->client, src_server, &msg, 604 &args->cna_seq_args, &res->cnr_seq_res, 0); 605 if (status == -ENOTSUPP) 606 src_server->caps &= ~NFS_CAP_COPY_NOTIFY; 607 608 put_nfs_open_context(nfs_file_open_context(src)); 609 return status; 610 } 611 612 int nfs42_proc_copy_notify(struct file *src, struct file *dst, 613 struct nfs42_copy_notify_res *res) 614 { 615 struct nfs_server *src_server = NFS_SERVER(file_inode(src)); 616 struct nfs42_copy_notify_args *args; 617 struct nfs4_exception exception = { 618 .inode = file_inode(src), 619 }; 620 int status; 621 622 if (!(src_server->caps & NFS_CAP_COPY_NOTIFY)) 623 return -EOPNOTSUPP; 624 625 args = kzalloc(sizeof(struct nfs42_copy_notify_args), GFP_NOFS); 626 if (args == NULL) 627 return -ENOMEM; 628 629 args->cna_src_fh = NFS_FH(file_inode(src)), 630 args->cna_dst.nl4_type = NL4_NETADDR; 631 nfs42_set_netaddr(dst, &args->cna_dst.u.nl4_addr); 632 exception.stateid = &args->cna_src_stateid; 633 634 do { 635 status = _nfs42_proc_copy_notify(src, dst, args, res); 636 if (status == -ENOTSUPP) { 637 status = -EOPNOTSUPP; 638 goto out; 639 } 640 status = nfs4_handle_exception(src_server, status, &exception); 641 } while (exception.retry); 642 643 out: 644 kfree(args); 645 return status; 646 } 647 648 static loff_t _nfs42_proc_llseek(struct file *filep, 649 struct nfs_lock_context *lock, loff_t offset, int whence) 650 { 651 struct inode *inode = file_inode(filep); 652 struct nfs42_seek_args args = { 653 .sa_fh = NFS_FH(inode), 654 .sa_offset = offset, 655 .sa_what = (whence == SEEK_HOLE) ? 656 NFS4_CONTENT_HOLE : NFS4_CONTENT_DATA, 657 }; 658 struct nfs42_seek_res res; 659 struct rpc_message msg = { 660 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEEK], 661 .rpc_argp = &args, 662 .rpc_resp = &res, 663 }; 664 struct nfs_server *server = NFS_SERVER(inode); 665 int status; 666 667 if (!nfs_server_capable(inode, NFS_CAP_SEEK)) 668 return -ENOTSUPP; 669 670 status = nfs4_set_rw_stateid(&args.sa_stateid, lock->open_context, 671 lock, FMODE_READ); 672 if (status) { 673 if (status == -EAGAIN) 674 status = -NFS4ERR_BAD_STATEID; 675 return status; 676 } 677 678 status = nfs_filemap_write_and_wait_range(inode->i_mapping, 679 offset, LLONG_MAX); 680 if (status) 681 return status; 682 683 status = nfs4_call_sync(server->client, server, &msg, 684 &args.seq_args, &res.seq_res, 0); 685 trace_nfs4_llseek(inode, &args, &res, status); 686 if (status == -ENOTSUPP) 687 server->caps &= ~NFS_CAP_SEEK; 688 if (status) 689 return status; 690 691 if (whence == SEEK_DATA && res.sr_eof) 692 return -NFS4ERR_NXIO; 693 else 694 return vfs_setpos(filep, res.sr_offset, inode->i_sb->s_maxbytes); 695 } 696 697 loff_t nfs42_proc_llseek(struct file *filep, loff_t offset, int whence) 698 { 699 struct nfs_server *server = NFS_SERVER(file_inode(filep)); 700 struct nfs4_exception exception = { }; 701 struct nfs_lock_context *lock; 702 loff_t err; 703 704 lock = nfs_get_lock_context(nfs_file_open_context(filep)); 705 if (IS_ERR(lock)) 706 return PTR_ERR(lock); 707 708 exception.inode = file_inode(filep); 709 exception.state = lock->open_context->state; 710 711 do { 712 err = _nfs42_proc_llseek(filep, lock, offset, whence); 713 if (err >= 0) 714 break; 715 if (err == -ENOTSUPP) { 716 err = -EOPNOTSUPP; 717 break; 718 } 719 err = nfs4_handle_exception(server, err, &exception); 720 } while (exception.retry); 721 722 nfs_put_lock_context(lock); 723 return err; 724 } 725 726 727 static void 728 nfs42_layoutstat_prepare(struct rpc_task *task, void *calldata) 729 { 730 struct nfs42_layoutstat_data *data = calldata; 731 struct inode *inode = data->inode; 732 struct nfs_server *server = NFS_SERVER(inode); 733 struct pnfs_layout_hdr *lo; 734 735 spin_lock(&inode->i_lock); 736 lo = NFS_I(inode)->layout; 737 if (!pnfs_layout_is_valid(lo)) { 738 spin_unlock(&inode->i_lock); 739 rpc_exit(task, 0); 740 return; 741 } 742 nfs4_stateid_copy(&data->args.stateid, &lo->plh_stateid); 743 spin_unlock(&inode->i_lock); 744 nfs4_setup_sequence(server->nfs_client, &data->args.seq_args, 745 &data->res.seq_res, task); 746 } 747 748 static void 749 nfs42_layoutstat_done(struct rpc_task *task, void *calldata) 750 { 751 struct nfs42_layoutstat_data *data = calldata; 752 struct inode *inode = data->inode; 753 struct pnfs_layout_hdr *lo; 754 755 if (!nfs4_sequence_done(task, &data->res.seq_res)) 756 return; 757 758 switch (task->tk_status) { 759 case 0: 760 return; 761 case -NFS4ERR_BADHANDLE: 762 case -ESTALE: 763 pnfs_destroy_layout(NFS_I(inode)); 764 break; 765 case -NFS4ERR_EXPIRED: 766 case -NFS4ERR_ADMIN_REVOKED: 767 case -NFS4ERR_DELEG_REVOKED: 768 case -NFS4ERR_STALE_STATEID: 769 case -NFS4ERR_BAD_STATEID: 770 spin_lock(&inode->i_lock); 771 lo = NFS_I(inode)->layout; 772 if (pnfs_layout_is_valid(lo) && 773 nfs4_stateid_match(&data->args.stateid, 774 &lo->plh_stateid)) { 775 LIST_HEAD(head); 776 777 /* 778 * Mark the bad layout state as invalid, then retry 779 * with the current stateid. 780 */ 781 pnfs_mark_layout_stateid_invalid(lo, &head); 782 spin_unlock(&inode->i_lock); 783 pnfs_free_lseg_list(&head); 784 nfs_commit_inode(inode, 0); 785 } else 786 spin_unlock(&inode->i_lock); 787 break; 788 case -NFS4ERR_OLD_STATEID: 789 spin_lock(&inode->i_lock); 790 lo = NFS_I(inode)->layout; 791 if (pnfs_layout_is_valid(lo) && 792 nfs4_stateid_match_other(&data->args.stateid, 793 &lo->plh_stateid)) { 794 /* Do we need to delay before resending? */ 795 if (!nfs4_stateid_is_newer(&lo->plh_stateid, 796 &data->args.stateid)) 797 rpc_delay(task, HZ); 798 rpc_restart_call_prepare(task); 799 } 800 spin_unlock(&inode->i_lock); 801 break; 802 case -ENOTSUPP: 803 case -EOPNOTSUPP: 804 NFS_SERVER(inode)->caps &= ~NFS_CAP_LAYOUTSTATS; 805 } 806 807 trace_nfs4_layoutstats(inode, &data->args.stateid, task->tk_status); 808 } 809 810 static void 811 nfs42_layoutstat_release(void *calldata) 812 { 813 struct nfs42_layoutstat_data *data = calldata; 814 struct nfs42_layoutstat_devinfo *devinfo = data->args.devinfo; 815 int i; 816 817 for (i = 0; i < data->args.num_dev; i++) { 818 if (devinfo[i].ld_private.ops && devinfo[i].ld_private.ops->free) 819 devinfo[i].ld_private.ops->free(&devinfo[i].ld_private); 820 } 821 822 pnfs_put_layout_hdr(NFS_I(data->args.inode)->layout); 823 smp_mb__before_atomic(); 824 clear_bit(NFS_INO_LAYOUTSTATS, &NFS_I(data->args.inode)->flags); 825 smp_mb__after_atomic(); 826 nfs_iput_and_deactive(data->inode); 827 kfree(data->args.devinfo); 828 kfree(data); 829 } 830 831 static const struct rpc_call_ops nfs42_layoutstat_ops = { 832 .rpc_call_prepare = nfs42_layoutstat_prepare, 833 .rpc_call_done = nfs42_layoutstat_done, 834 .rpc_release = nfs42_layoutstat_release, 835 }; 836 837 int nfs42_proc_layoutstats_generic(struct nfs_server *server, 838 struct nfs42_layoutstat_data *data) 839 { 840 struct rpc_message msg = { 841 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTSTATS], 842 .rpc_argp = &data->args, 843 .rpc_resp = &data->res, 844 }; 845 struct rpc_task_setup task_setup = { 846 .rpc_client = server->client, 847 .rpc_message = &msg, 848 .callback_ops = &nfs42_layoutstat_ops, 849 .callback_data = data, 850 .flags = RPC_TASK_ASYNC, 851 }; 852 struct rpc_task *task; 853 854 data->inode = nfs_igrab_and_active(data->args.inode); 855 if (!data->inode) { 856 nfs42_layoutstat_release(data); 857 return -EAGAIN; 858 } 859 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0); 860 task = rpc_run_task(&task_setup); 861 if (IS_ERR(task)) 862 return PTR_ERR(task); 863 rpc_put_task(task); 864 return 0; 865 } 866 867 static struct nfs42_layouterror_data * 868 nfs42_alloc_layouterror_data(struct pnfs_layout_segment *lseg, gfp_t gfp_flags) 869 { 870 struct nfs42_layouterror_data *data; 871 struct inode *inode = lseg->pls_layout->plh_inode; 872 873 data = kzalloc(sizeof(*data), gfp_flags); 874 if (data) { 875 data->args.inode = data->inode = nfs_igrab_and_active(inode); 876 if (data->inode) { 877 data->lseg = pnfs_get_lseg(lseg); 878 if (data->lseg) 879 return data; 880 nfs_iput_and_deactive(data->inode); 881 } 882 kfree(data); 883 } 884 return NULL; 885 } 886 887 static void 888 nfs42_free_layouterror_data(struct nfs42_layouterror_data *data) 889 { 890 pnfs_put_lseg(data->lseg); 891 nfs_iput_and_deactive(data->inode); 892 kfree(data); 893 } 894 895 static void 896 nfs42_layouterror_prepare(struct rpc_task *task, void *calldata) 897 { 898 struct nfs42_layouterror_data *data = calldata; 899 struct inode *inode = data->inode; 900 struct nfs_server *server = NFS_SERVER(inode); 901 struct pnfs_layout_hdr *lo = data->lseg->pls_layout; 902 unsigned i; 903 904 spin_lock(&inode->i_lock); 905 if (!pnfs_layout_is_valid(lo)) { 906 spin_unlock(&inode->i_lock); 907 rpc_exit(task, 0); 908 return; 909 } 910 for (i = 0; i < data->args.num_errors; i++) 911 nfs4_stateid_copy(&data->args.errors[i].stateid, 912 &lo->plh_stateid); 913 spin_unlock(&inode->i_lock); 914 nfs4_setup_sequence(server->nfs_client, &data->args.seq_args, 915 &data->res.seq_res, task); 916 } 917 918 static void 919 nfs42_layouterror_done(struct rpc_task *task, void *calldata) 920 { 921 struct nfs42_layouterror_data *data = calldata; 922 struct inode *inode = data->inode; 923 struct pnfs_layout_hdr *lo = data->lseg->pls_layout; 924 925 if (!nfs4_sequence_done(task, &data->res.seq_res)) 926 return; 927 928 switch (task->tk_status) { 929 case 0: 930 return; 931 case -NFS4ERR_BADHANDLE: 932 case -ESTALE: 933 pnfs_destroy_layout(NFS_I(inode)); 934 break; 935 case -NFS4ERR_EXPIRED: 936 case -NFS4ERR_ADMIN_REVOKED: 937 case -NFS4ERR_DELEG_REVOKED: 938 case -NFS4ERR_STALE_STATEID: 939 case -NFS4ERR_BAD_STATEID: 940 spin_lock(&inode->i_lock); 941 if (pnfs_layout_is_valid(lo) && 942 nfs4_stateid_match(&data->args.errors[0].stateid, 943 &lo->plh_stateid)) { 944 LIST_HEAD(head); 945 946 /* 947 * Mark the bad layout state as invalid, then retry 948 * with the current stateid. 949 */ 950 pnfs_mark_layout_stateid_invalid(lo, &head); 951 spin_unlock(&inode->i_lock); 952 pnfs_free_lseg_list(&head); 953 nfs_commit_inode(inode, 0); 954 } else 955 spin_unlock(&inode->i_lock); 956 break; 957 case -NFS4ERR_OLD_STATEID: 958 spin_lock(&inode->i_lock); 959 if (pnfs_layout_is_valid(lo) && 960 nfs4_stateid_match_other(&data->args.errors[0].stateid, 961 &lo->plh_stateid)) { 962 /* Do we need to delay before resending? */ 963 if (!nfs4_stateid_is_newer(&lo->plh_stateid, 964 &data->args.errors[0].stateid)) 965 rpc_delay(task, HZ); 966 rpc_restart_call_prepare(task); 967 } 968 spin_unlock(&inode->i_lock); 969 break; 970 case -ENOTSUPP: 971 case -EOPNOTSUPP: 972 NFS_SERVER(inode)->caps &= ~NFS_CAP_LAYOUTERROR; 973 } 974 975 trace_nfs4_layouterror(inode, &data->args.errors[0].stateid, 976 task->tk_status); 977 } 978 979 static void 980 nfs42_layouterror_release(void *calldata) 981 { 982 struct nfs42_layouterror_data *data = calldata; 983 984 nfs42_free_layouterror_data(data); 985 } 986 987 static const struct rpc_call_ops nfs42_layouterror_ops = { 988 .rpc_call_prepare = nfs42_layouterror_prepare, 989 .rpc_call_done = nfs42_layouterror_done, 990 .rpc_release = nfs42_layouterror_release, 991 }; 992 993 int nfs42_proc_layouterror(struct pnfs_layout_segment *lseg, 994 const struct nfs42_layout_error *errors, size_t n) 995 { 996 struct inode *inode = lseg->pls_layout->plh_inode; 997 struct nfs42_layouterror_data *data; 998 struct rpc_task *task; 999 struct rpc_message msg = { 1000 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTERROR], 1001 }; 1002 struct rpc_task_setup task_setup = { 1003 .rpc_message = &msg, 1004 .callback_ops = &nfs42_layouterror_ops, 1005 .flags = RPC_TASK_ASYNC, 1006 }; 1007 unsigned int i; 1008 1009 if (!nfs_server_capable(inode, NFS_CAP_LAYOUTERROR)) 1010 return -EOPNOTSUPP; 1011 if (n > NFS42_LAYOUTERROR_MAX) 1012 return -EINVAL; 1013 data = nfs42_alloc_layouterror_data(lseg, GFP_NOFS); 1014 if (!data) 1015 return -ENOMEM; 1016 for (i = 0; i < n; i++) { 1017 data->args.errors[i] = errors[i]; 1018 data->args.num_errors++; 1019 data->res.num_errors++; 1020 } 1021 msg.rpc_argp = &data->args; 1022 msg.rpc_resp = &data->res; 1023 task_setup.callback_data = data; 1024 task_setup.rpc_client = NFS_SERVER(inode)->client; 1025 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0); 1026 task = rpc_run_task(&task_setup); 1027 if (IS_ERR(task)) 1028 return PTR_ERR(task); 1029 rpc_put_task(task); 1030 return 0; 1031 } 1032 EXPORT_SYMBOL_GPL(nfs42_proc_layouterror); 1033 1034 static int _nfs42_proc_clone(struct rpc_message *msg, struct file *src_f, 1035 struct file *dst_f, struct nfs_lock_context *src_lock, 1036 struct nfs_lock_context *dst_lock, loff_t src_offset, 1037 loff_t dst_offset, loff_t count) 1038 { 1039 struct inode *src_inode = file_inode(src_f); 1040 struct inode *dst_inode = file_inode(dst_f); 1041 struct nfs_server *server = NFS_SERVER(dst_inode); 1042 struct nfs42_clone_args args = { 1043 .src_fh = NFS_FH(src_inode), 1044 .dst_fh = NFS_FH(dst_inode), 1045 .src_offset = src_offset, 1046 .dst_offset = dst_offset, 1047 .count = count, 1048 .dst_bitmask = server->cache_consistency_bitmask, 1049 }; 1050 struct nfs42_clone_res res = { 1051 .server = server, 1052 }; 1053 int status; 1054 1055 msg->rpc_argp = &args; 1056 msg->rpc_resp = &res; 1057 1058 status = nfs4_set_rw_stateid(&args.src_stateid, src_lock->open_context, 1059 src_lock, FMODE_READ); 1060 if (status) { 1061 if (status == -EAGAIN) 1062 status = -NFS4ERR_BAD_STATEID; 1063 return status; 1064 } 1065 status = nfs4_set_rw_stateid(&args.dst_stateid, dst_lock->open_context, 1066 dst_lock, FMODE_WRITE); 1067 if (status) { 1068 if (status == -EAGAIN) 1069 status = -NFS4ERR_BAD_STATEID; 1070 return status; 1071 } 1072 1073 res.dst_fattr = nfs_alloc_fattr(); 1074 if (!res.dst_fattr) 1075 return -ENOMEM; 1076 1077 status = nfs4_call_sync(server->client, server, msg, 1078 &args.seq_args, &res.seq_res, 0); 1079 if (status == 0) { 1080 nfs42_copy_dest_done(dst_inode, dst_offset, count); 1081 status = nfs_post_op_update_inode(dst_inode, res.dst_fattr); 1082 } 1083 1084 kfree(res.dst_fattr); 1085 return status; 1086 } 1087 1088 int nfs42_proc_clone(struct file *src_f, struct file *dst_f, 1089 loff_t src_offset, loff_t dst_offset, loff_t count) 1090 { 1091 struct rpc_message msg = { 1092 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLONE], 1093 }; 1094 struct inode *inode = file_inode(src_f); 1095 struct nfs_server *server = NFS_SERVER(file_inode(src_f)); 1096 struct nfs_lock_context *src_lock; 1097 struct nfs_lock_context *dst_lock; 1098 struct nfs4_exception src_exception = { }; 1099 struct nfs4_exception dst_exception = { }; 1100 int err, err2; 1101 1102 if (!nfs_server_capable(inode, NFS_CAP_CLONE)) 1103 return -EOPNOTSUPP; 1104 1105 src_lock = nfs_get_lock_context(nfs_file_open_context(src_f)); 1106 if (IS_ERR(src_lock)) 1107 return PTR_ERR(src_lock); 1108 1109 src_exception.inode = file_inode(src_f); 1110 src_exception.state = src_lock->open_context->state; 1111 1112 dst_lock = nfs_get_lock_context(nfs_file_open_context(dst_f)); 1113 if (IS_ERR(dst_lock)) { 1114 err = PTR_ERR(dst_lock); 1115 goto out_put_src_lock; 1116 } 1117 1118 dst_exception.inode = file_inode(dst_f); 1119 dst_exception.state = dst_lock->open_context->state; 1120 1121 do { 1122 err = _nfs42_proc_clone(&msg, src_f, dst_f, src_lock, dst_lock, 1123 src_offset, dst_offset, count); 1124 if (err == -ENOTSUPP || err == -EOPNOTSUPP) { 1125 NFS_SERVER(inode)->caps &= ~NFS_CAP_CLONE; 1126 err = -EOPNOTSUPP; 1127 break; 1128 } 1129 1130 err2 = nfs4_handle_exception(server, err, &src_exception); 1131 err = nfs4_handle_exception(server, err, &dst_exception); 1132 if (!err) 1133 err = err2; 1134 } while (src_exception.retry || dst_exception.retry); 1135 1136 nfs_put_lock_context(dst_lock); 1137 out_put_src_lock: 1138 nfs_put_lock_context(src_lock); 1139 return err; 1140 } 1141 1142 #define NFS4XATTR_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE) 1143 1144 static int _nfs42_proc_removexattr(struct inode *inode, const char *name) 1145 { 1146 struct nfs_server *server = NFS_SERVER(inode); 1147 struct nfs42_removexattrargs args = { 1148 .fh = NFS_FH(inode), 1149 .xattr_name = name, 1150 }; 1151 struct nfs42_removexattrres res; 1152 struct rpc_message msg = { 1153 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVEXATTR], 1154 .rpc_argp = &args, 1155 .rpc_resp = &res, 1156 }; 1157 int ret; 1158 unsigned long timestamp = jiffies; 1159 1160 ret = nfs4_call_sync(server->client, server, &msg, &args.seq_args, 1161 &res.seq_res, 1); 1162 if (!ret) 1163 nfs4_update_changeattr(inode, &res.cinfo, timestamp, 0); 1164 1165 return ret; 1166 } 1167 1168 static int _nfs42_proc_setxattr(struct inode *inode, const char *name, 1169 const void *buf, size_t buflen, int flags) 1170 { 1171 struct nfs_server *server = NFS_SERVER(inode); 1172 struct page *pages[NFS4XATTR_MAXPAGES]; 1173 struct nfs42_setxattrargs arg = { 1174 .fh = NFS_FH(inode), 1175 .xattr_pages = pages, 1176 .xattr_len = buflen, 1177 .xattr_name = name, 1178 .xattr_flags = flags, 1179 }; 1180 struct nfs42_setxattrres res; 1181 struct rpc_message msg = { 1182 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETXATTR], 1183 .rpc_argp = &arg, 1184 .rpc_resp = &res, 1185 }; 1186 int ret, np; 1187 unsigned long timestamp = jiffies; 1188 1189 if (buflen > server->sxasize) 1190 return -ERANGE; 1191 1192 if (buflen > 0) { 1193 np = nfs4_buf_to_pages_noslab(buf, buflen, arg.xattr_pages); 1194 if (np < 0) 1195 return np; 1196 } else 1197 np = 0; 1198 1199 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, 1200 &res.seq_res, 1); 1201 1202 for (; np > 0; np--) 1203 put_page(pages[np - 1]); 1204 1205 if (!ret) 1206 nfs4_update_changeattr(inode, &res.cinfo, timestamp, 0); 1207 1208 return ret; 1209 } 1210 1211 static ssize_t _nfs42_proc_getxattr(struct inode *inode, const char *name, 1212 void *buf, size_t buflen, struct page **pages, 1213 size_t plen) 1214 { 1215 struct nfs_server *server = NFS_SERVER(inode); 1216 struct nfs42_getxattrargs arg = { 1217 .fh = NFS_FH(inode), 1218 .xattr_name = name, 1219 }; 1220 struct nfs42_getxattrres res; 1221 struct rpc_message msg = { 1222 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETXATTR], 1223 .rpc_argp = &arg, 1224 .rpc_resp = &res, 1225 }; 1226 ssize_t ret; 1227 1228 arg.xattr_len = plen; 1229 arg.xattr_pages = pages; 1230 1231 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, 1232 &res.seq_res, 0); 1233 if (ret < 0) 1234 return ret; 1235 1236 /* 1237 * Normally, the caching is done one layer up, but for successful 1238 * RPCS, always cache the result here, even if the caller was 1239 * just querying the length, or if the reply was too big for 1240 * the caller. This avoids a second RPC in the case of the 1241 * common query-alloc-retrieve cycle for xattrs. 1242 * 1243 * Note that xattr_len is always capped to XATTR_SIZE_MAX. 1244 */ 1245 1246 nfs4_xattr_cache_add(inode, name, NULL, pages, res.xattr_len); 1247 1248 if (buflen) { 1249 if (res.xattr_len > buflen) 1250 return -ERANGE; 1251 _copy_from_pages(buf, pages, 0, res.xattr_len); 1252 } 1253 1254 return res.xattr_len; 1255 } 1256 1257 static ssize_t _nfs42_proc_listxattrs(struct inode *inode, void *buf, 1258 size_t buflen, u64 *cookiep, bool *eofp) 1259 { 1260 struct nfs_server *server = NFS_SERVER(inode); 1261 struct page **pages; 1262 struct nfs42_listxattrsargs arg = { 1263 .fh = NFS_FH(inode), 1264 .cookie = *cookiep, 1265 }; 1266 struct nfs42_listxattrsres res = { 1267 .eof = false, 1268 .xattr_buf = buf, 1269 .xattr_len = buflen, 1270 }; 1271 struct rpc_message msg = { 1272 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LISTXATTRS], 1273 .rpc_argp = &arg, 1274 .rpc_resp = &res, 1275 }; 1276 u32 xdrlen; 1277 int ret, np, i; 1278 1279 1280 ret = -ENOMEM; 1281 res.scratch = alloc_page(GFP_KERNEL); 1282 if (!res.scratch) 1283 goto out; 1284 1285 xdrlen = nfs42_listxattr_xdrsize(buflen); 1286 if (xdrlen > server->lxasize) 1287 xdrlen = server->lxasize; 1288 np = xdrlen / PAGE_SIZE + 1; 1289 1290 pages = kcalloc(np, sizeof(struct page *), GFP_KERNEL); 1291 if (!pages) 1292 goto out_free_scratch; 1293 for (i = 0; i < np; i++) { 1294 pages[i] = alloc_page(GFP_KERNEL); 1295 if (!pages[i]) 1296 goto out_free_pages; 1297 } 1298 1299 arg.xattr_pages = pages; 1300 arg.count = xdrlen; 1301 1302 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, 1303 &res.seq_res, 0); 1304 1305 if (ret >= 0) { 1306 ret = res.copied; 1307 *cookiep = res.cookie; 1308 *eofp = res.eof; 1309 } 1310 1311 out_free_pages: 1312 while (--np >= 0) { 1313 if (pages[np]) 1314 __free_page(pages[np]); 1315 } 1316 kfree(pages); 1317 out_free_scratch: 1318 __free_page(res.scratch); 1319 out: 1320 return ret; 1321 1322 } 1323 1324 ssize_t nfs42_proc_getxattr(struct inode *inode, const char *name, 1325 void *buf, size_t buflen) 1326 { 1327 struct nfs4_exception exception = { }; 1328 ssize_t err, np, i; 1329 struct page **pages; 1330 1331 np = nfs_page_array_len(0, buflen ?: XATTR_SIZE_MAX); 1332 pages = kmalloc_array(np, sizeof(*pages), GFP_KERNEL); 1333 if (!pages) 1334 return -ENOMEM; 1335 1336 for (i = 0; i < np; i++) { 1337 pages[i] = alloc_page(GFP_KERNEL); 1338 if (!pages[i]) { 1339 np = i + 1; 1340 err = -ENOMEM; 1341 goto out; 1342 } 1343 } 1344 1345 /* 1346 * The GETXATTR op has no length field in the call, and the 1347 * xattr data is at the end of the reply. 1348 * 1349 * There is no downside in using the page-aligned length. It will 1350 * allow receiving and caching xattrs that are too large for the 1351 * caller but still fit in the page-rounded value. 1352 */ 1353 do { 1354 err = _nfs42_proc_getxattr(inode, name, buf, buflen, 1355 pages, np * PAGE_SIZE); 1356 if (err >= 0) 1357 break; 1358 err = nfs4_handle_exception(NFS_SERVER(inode), err, 1359 &exception); 1360 } while (exception.retry); 1361 1362 out: 1363 while (--np >= 0) 1364 __free_page(pages[np]); 1365 kfree(pages); 1366 1367 return err; 1368 } 1369 1370 int nfs42_proc_setxattr(struct inode *inode, const char *name, 1371 const void *buf, size_t buflen, int flags) 1372 { 1373 struct nfs4_exception exception = { }; 1374 int err; 1375 1376 do { 1377 err = _nfs42_proc_setxattr(inode, name, buf, buflen, flags); 1378 if (!err) 1379 break; 1380 err = nfs4_handle_exception(NFS_SERVER(inode), err, 1381 &exception); 1382 } while (exception.retry); 1383 1384 return err; 1385 } 1386 1387 ssize_t nfs42_proc_listxattrs(struct inode *inode, void *buf, 1388 size_t buflen, u64 *cookiep, bool *eofp) 1389 { 1390 struct nfs4_exception exception = { }; 1391 ssize_t err; 1392 1393 do { 1394 err = _nfs42_proc_listxattrs(inode, buf, buflen, 1395 cookiep, eofp); 1396 if (err >= 0) 1397 break; 1398 err = nfs4_handle_exception(NFS_SERVER(inode), err, 1399 &exception); 1400 } while (exception.retry); 1401 1402 return err; 1403 } 1404 1405 int nfs42_proc_removexattr(struct inode *inode, const char *name) 1406 { 1407 struct nfs4_exception exception = { }; 1408 int err; 1409 1410 do { 1411 err = _nfs42_proc_removexattr(inode, name); 1412 if (!err) 1413 break; 1414 err = nfs4_handle_exception(NFS_SERVER(inode), err, 1415 &exception); 1416 } while (exception.retry); 1417 1418 return err; 1419 } 1420