1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/fs/nfs/nfs3proc.c 4 * 5 * Client-side NFSv3 procedures stubs. 6 * 7 * Copyright (C) 1997, Olaf Kirch 8 */ 9 10 #include <linux/mm.h> 11 #include <linux/errno.h> 12 #include <linux/string.h> 13 #include <linux/sunrpc/clnt.h> 14 #include <linux/slab.h> 15 #include <linux/nfs.h> 16 #include <linux/nfs3.h> 17 #include <linux/nfs_fs.h> 18 #include <linux/nfs_page.h> 19 #include <linux/lockd/bind.h> 20 #include <linux/nfs_mount.h> 21 #include <linux/freezer.h> 22 #include <linux/xattr.h> 23 24 #include "iostat.h" 25 #include "internal.h" 26 #include "nfs3_fs.h" 27 28 #define NFSDBG_FACILITY NFSDBG_PROC 29 30 /* A wrapper to handle the EJUKEBOX error messages */ 31 static int 32 nfs3_rpc_wrapper(struct rpc_clnt *clnt, struct rpc_message *msg, int flags) 33 { 34 int res; 35 do { 36 res = rpc_call_sync(clnt, msg, flags); 37 if (res != -EJUKEBOX) 38 break; 39 __set_current_state(TASK_KILLABLE|TASK_FREEZABLE_UNSAFE); 40 schedule_timeout(NFS_JUKEBOX_RETRY_TIME); 41 res = -ERESTARTSYS; 42 } while (!fatal_signal_pending(current) && !nfs_current_task_exiting()); 43 return res; 44 } 45 46 #define rpc_call_sync(clnt, msg, flags) nfs3_rpc_wrapper(clnt, msg, flags) 47 48 static int 49 nfs3_async_handle_jukebox(struct rpc_task *task, struct inode *inode) 50 { 51 if (task->tk_status != -EJUKEBOX) 52 return 0; 53 nfs_inc_stats(inode, NFSIOS_DELAY); 54 task->tk_status = 0; 55 rpc_restart_call(task); 56 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME); 57 return 1; 58 } 59 60 static int 61 do_proc_get_root(struct rpc_clnt *client, struct nfs_fh *fhandle, 62 struct nfs_fsinfo *info) 63 { 64 struct rpc_message msg = { 65 .rpc_proc = &nfs3_procedures[NFS3PROC_FSINFO], 66 .rpc_argp = fhandle, 67 .rpc_resp = info, 68 }; 69 int status; 70 71 dprintk("%s: call fsinfo\n", __func__); 72 nfs_fattr_init(info->fattr); 73 status = rpc_call_sync(client, &msg, 0); 74 dprintk("%s: reply fsinfo: %d\n", __func__, status); 75 if (status == 0 && !(info->fattr->valid & NFS_ATTR_FATTR)) { 76 msg.rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR]; 77 msg.rpc_resp = info->fattr; 78 status = rpc_call_sync(client, &msg, 0); 79 dprintk("%s: reply getattr: %d\n", __func__, status); 80 } 81 return status; 82 } 83 84 /* 85 * Bare-bones access to getattr: this is for nfs_get_root/nfs_get_sb 86 */ 87 static int 88 nfs3_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle, 89 struct nfs_fsinfo *info) 90 { 91 int status; 92 93 status = do_proc_get_root(server->client, fhandle, info); 94 if (status && server->nfs_client->cl_rpcclient != server->client) 95 status = do_proc_get_root(server->nfs_client->cl_rpcclient, fhandle, info); 96 return status; 97 } 98 99 /* 100 * One function for each procedure in the NFS protocol. 101 */ 102 static int 103 nfs3_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 104 struct nfs_fattr *fattr, struct inode *inode) 105 { 106 struct rpc_message msg = { 107 .rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR], 108 .rpc_argp = fhandle, 109 .rpc_resp = fattr, 110 }; 111 int status; 112 unsigned short task_flags = 0; 113 114 /* Is this is an attribute revalidation, subject to softreval? */ 115 if (inode && (server->flags & NFS_MOUNT_SOFTREVAL)) 116 task_flags |= RPC_TASK_TIMEOUT; 117 118 dprintk("NFS call getattr\n"); 119 nfs_fattr_init(fattr); 120 status = rpc_call_sync(server->client, &msg, task_flags); 121 dprintk("NFS reply getattr: %d\n", status); 122 return status; 123 } 124 125 static int 126 nfs3_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, 127 struct iattr *sattr) 128 { 129 struct inode *inode = d_inode(dentry); 130 struct nfs3_sattrargs arg = { 131 .fh = NFS_FH(inode), 132 .sattr = sattr, 133 }; 134 struct rpc_message msg = { 135 .rpc_proc = &nfs3_procedures[NFS3PROC_SETATTR], 136 .rpc_argp = &arg, 137 .rpc_resp = fattr, 138 }; 139 int status; 140 141 dprintk("NFS call setattr\n"); 142 if (sattr->ia_valid & ATTR_FILE) 143 msg.rpc_cred = nfs_file_cred(sattr->ia_file); 144 nfs_fattr_init(fattr); 145 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); 146 if (status == 0) { 147 nfs_setattr_update_inode(inode, sattr, fattr); 148 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL) 149 nfs_zap_acl_cache(inode); 150 } 151 dprintk("NFS reply setattr: %d\n", status); 152 return status; 153 } 154 155 static int 156 __nfs3_proc_lookup(struct inode *dir, const char *name, size_t len, 157 struct nfs_fh *fhandle, struct nfs_fattr *fattr, 158 unsigned short task_flags) 159 { 160 struct nfs3_diropargs arg = { 161 .fh = NFS_FH(dir), 162 .name = name, 163 .len = len 164 }; 165 struct nfs3_diropres res = { 166 .fh = fhandle, 167 .fattr = fattr 168 }; 169 struct rpc_message msg = { 170 .rpc_proc = &nfs3_procedures[NFS3PROC_LOOKUP], 171 .rpc_argp = &arg, 172 .rpc_resp = &res, 173 }; 174 int status; 175 176 res.dir_attr = nfs_alloc_fattr(); 177 if (res.dir_attr == NULL) 178 return -ENOMEM; 179 180 nfs_fattr_init(fattr); 181 status = rpc_call_sync(NFS_CLIENT(dir), &msg, task_flags); 182 nfs_refresh_inode(dir, res.dir_attr); 183 if (status >= 0 && !(fattr->valid & NFS_ATTR_FATTR)) { 184 msg.rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR]; 185 msg.rpc_argp = fhandle; 186 msg.rpc_resp = fattr; 187 status = rpc_call_sync(NFS_CLIENT(dir), &msg, task_flags); 188 } 189 nfs_free_fattr(res.dir_attr); 190 dprintk("NFS reply lookup: %d\n", status); 191 return status; 192 } 193 194 static int 195 nfs3_proc_lookup(struct inode *dir, struct dentry *dentry, const struct qstr *name, 196 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 197 { 198 unsigned short task_flags = 0; 199 200 /* Is this is an attribute revalidation, subject to softreval? */ 201 if (nfs_lookup_is_soft_revalidate(dentry)) 202 task_flags |= RPC_TASK_TIMEOUT; 203 204 dprintk("NFS call lookup %pd2\n", dentry); 205 return __nfs3_proc_lookup(dir, name->name, name->len, fhandle, fattr, 206 task_flags); 207 } 208 209 static int nfs3_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle, 210 struct nfs_fattr *fattr) 211 { 212 const char dotdot[] = ".."; 213 const size_t len = strlen(dotdot); 214 unsigned short task_flags = 0; 215 216 if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL) 217 task_flags |= RPC_TASK_TIMEOUT; 218 219 return __nfs3_proc_lookup(inode, dotdot, len, fhandle, fattr, 220 task_flags); 221 } 222 223 static int nfs3_proc_access(struct inode *inode, struct nfs_access_entry *entry, 224 const struct cred *cred) 225 { 226 struct nfs3_accessargs arg = { 227 .fh = NFS_FH(inode), 228 .access = entry->mask, 229 }; 230 struct nfs3_accessres res; 231 struct rpc_message msg = { 232 .rpc_proc = &nfs3_procedures[NFS3PROC_ACCESS], 233 .rpc_argp = &arg, 234 .rpc_resp = &res, 235 .rpc_cred = cred, 236 }; 237 int status = -ENOMEM; 238 239 dprintk("NFS call access\n"); 240 res.fattr = nfs_alloc_fattr(); 241 if (res.fattr == NULL) 242 goto out; 243 244 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); 245 nfs_refresh_inode(inode, res.fattr); 246 if (status == 0) 247 nfs_access_set_mask(entry, res.access); 248 nfs_free_fattr(res.fattr); 249 out: 250 dprintk("NFS reply access: %d\n", status); 251 return status; 252 } 253 254 static int nfs3_proc_readlink(struct inode *inode, struct page *page, 255 unsigned int pgbase, unsigned int pglen) 256 { 257 struct nfs_fattr *fattr; 258 struct nfs3_readlinkargs args = { 259 .fh = NFS_FH(inode), 260 .pgbase = pgbase, 261 .pglen = pglen, 262 .pages = &page 263 }; 264 struct rpc_message msg = { 265 .rpc_proc = &nfs3_procedures[NFS3PROC_READLINK], 266 .rpc_argp = &args, 267 }; 268 int status = -ENOMEM; 269 270 dprintk("NFS call readlink\n"); 271 fattr = nfs_alloc_fattr(); 272 if (fattr == NULL) 273 goto out; 274 msg.rpc_resp = fattr; 275 276 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); 277 nfs_refresh_inode(inode, fattr); 278 nfs_free_fattr(fattr); 279 out: 280 dprintk("NFS reply readlink: %d\n", status); 281 return status; 282 } 283 284 struct nfs3_createdata { 285 struct rpc_message msg; 286 union { 287 struct nfs3_createargs create; 288 struct nfs3_mkdirargs mkdir; 289 struct nfs3_symlinkargs symlink; 290 struct nfs3_mknodargs mknod; 291 } arg; 292 struct nfs3_diropres res; 293 struct nfs_fh fh; 294 struct nfs_fattr fattr; 295 struct nfs_fattr dir_attr; 296 }; 297 298 static struct nfs3_createdata *nfs3_alloc_createdata(void) 299 { 300 struct nfs3_createdata *data; 301 302 data = kzalloc(sizeof(*data), GFP_KERNEL); 303 if (data != NULL) { 304 data->msg.rpc_argp = &data->arg; 305 data->msg.rpc_resp = &data->res; 306 data->res.fh = &data->fh; 307 data->res.fattr = &data->fattr; 308 data->res.dir_attr = &data->dir_attr; 309 nfs_fattr_init(data->res.fattr); 310 nfs_fattr_init(data->res.dir_attr); 311 } 312 return data; 313 } 314 315 static struct dentry * 316 nfs3_do_create(struct inode *dir, struct dentry *dentry, struct nfs3_createdata *data) 317 { 318 int status; 319 320 status = rpc_call_sync(NFS_CLIENT(dir), &data->msg, 0); 321 nfs_post_op_update_inode(dir, data->res.dir_attr); 322 if (status != 0) 323 return ERR_PTR(status); 324 325 return nfs_add_or_obtain(dentry, data->res.fh, data->res.fattr); 326 } 327 328 static void nfs3_free_createdata(struct nfs3_createdata *data) 329 { 330 kfree(data); 331 } 332 333 /* 334 * Create a regular file. 335 */ 336 static int 337 nfs3_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 338 int flags) 339 { 340 struct posix_acl *default_acl, *acl; 341 struct nfs3_createdata *data; 342 struct dentry *d_alias; 343 int status = -ENOMEM; 344 345 dprintk("NFS call create %pd\n", dentry); 346 347 data = nfs3_alloc_createdata(); 348 if (data == NULL) 349 goto out; 350 351 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_CREATE]; 352 data->arg.create.fh = NFS_FH(dir); 353 data->arg.create.name = dentry->d_name.name; 354 data->arg.create.len = dentry->d_name.len; 355 data->arg.create.sattr = sattr; 356 357 data->arg.create.createmode = NFS3_CREATE_UNCHECKED; 358 if (flags & O_EXCL) { 359 data->arg.create.createmode = NFS3_CREATE_EXCLUSIVE; 360 data->arg.create.verifier[0] = cpu_to_be32(jiffies); 361 data->arg.create.verifier[1] = cpu_to_be32(current->pid); 362 } 363 364 status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl); 365 if (status) 366 goto out; 367 368 for (;;) { 369 d_alias = nfs3_do_create(dir, dentry, data); 370 status = PTR_ERR_OR_ZERO(d_alias); 371 372 if (status != -ENOTSUPP) 373 break; 374 /* If the server doesn't support the exclusive creation 375 * semantics, try again with simple 'guarded' mode. */ 376 switch (data->arg.create.createmode) { 377 case NFS3_CREATE_EXCLUSIVE: 378 data->arg.create.createmode = NFS3_CREATE_GUARDED; 379 break; 380 381 case NFS3_CREATE_GUARDED: 382 data->arg.create.createmode = NFS3_CREATE_UNCHECKED; 383 break; 384 385 case NFS3_CREATE_UNCHECKED: 386 goto out_release_acls; 387 } 388 nfs_fattr_init(data->res.dir_attr); 389 nfs_fattr_init(data->res.fattr); 390 } 391 392 if (status != 0) 393 goto out_release_acls; 394 395 if (d_alias) 396 dentry = d_alias; 397 398 /* When we created the file with exclusive semantics, make 399 * sure we set the attributes afterwards. */ 400 if (data->arg.create.createmode == NFS3_CREATE_EXCLUSIVE) { 401 dprintk("NFS call setattr (post-create)\n"); 402 403 if (!(sattr->ia_valid & ATTR_ATIME_SET)) 404 sattr->ia_valid |= ATTR_ATIME; 405 if (!(sattr->ia_valid & ATTR_MTIME_SET)) 406 sattr->ia_valid |= ATTR_MTIME; 407 408 /* Note: we could use a guarded setattr here, but I'm 409 * not sure this buys us anything (and I'd have 410 * to revamp the NFSv3 XDR code) */ 411 status = nfs3_proc_setattr(dentry, data->res.fattr, sattr); 412 nfs_post_op_update_inode(d_inode(dentry), data->res.fattr); 413 dprintk("NFS reply setattr (post-create): %d\n", status); 414 if (status != 0) 415 goto out_dput; 416 } 417 418 status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl); 419 420 out_dput: 421 dput(d_alias); 422 out_release_acls: 423 posix_acl_release(acl); 424 posix_acl_release(default_acl); 425 out: 426 nfs3_free_createdata(data); 427 dprintk("NFS reply create: %d\n", status); 428 return status; 429 } 430 431 static int 432 nfs3_proc_remove(struct inode *dir, struct dentry *dentry) 433 { 434 struct nfs_removeargs arg = { 435 .fh = NFS_FH(dir), 436 .name = dentry->d_name, 437 }; 438 struct nfs_removeres res; 439 struct rpc_message msg = { 440 .rpc_proc = &nfs3_procedures[NFS3PROC_REMOVE], 441 .rpc_argp = &arg, 442 .rpc_resp = &res, 443 }; 444 int status = -ENOMEM; 445 446 dprintk("NFS call remove %pd2\n", dentry); 447 res.dir_attr = nfs_alloc_fattr(); 448 if (res.dir_attr == NULL) 449 goto out; 450 451 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 452 nfs_post_op_update_inode(dir, res.dir_attr); 453 nfs_free_fattr(res.dir_attr); 454 out: 455 dprintk("NFS reply remove: %d\n", status); 456 return status; 457 } 458 459 static void 460 nfs3_proc_unlink_setup(struct rpc_message *msg, 461 struct dentry *dentry, 462 struct inode *inode) 463 { 464 msg->rpc_proc = &nfs3_procedures[NFS3PROC_REMOVE]; 465 } 466 467 static void nfs3_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data) 468 { 469 rpc_call_start(task); 470 } 471 472 static int 473 nfs3_proc_unlink_done(struct rpc_task *task, struct inode *dir) 474 { 475 struct nfs_removeres *res; 476 if (nfs3_async_handle_jukebox(task, dir)) 477 return 0; 478 res = task->tk_msg.rpc_resp; 479 nfs_post_op_update_inode(dir, res->dir_attr); 480 return 1; 481 } 482 483 static void 484 nfs3_proc_rename_setup(struct rpc_message *msg, 485 struct dentry *old_dentry, 486 struct dentry *new_dentry, 487 struct inode *same_parent) 488 { 489 msg->rpc_proc = &nfs3_procedures[NFS3PROC_RENAME]; 490 } 491 492 static void nfs3_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data) 493 { 494 rpc_call_start(task); 495 } 496 497 static int 498 nfs3_proc_rename_done(struct rpc_task *task, struct inode *old_dir, 499 struct inode *new_dir) 500 { 501 struct nfs_renameres *res; 502 503 if (nfs3_async_handle_jukebox(task, old_dir)) 504 return 0; 505 res = task->tk_msg.rpc_resp; 506 507 nfs_post_op_update_inode(old_dir, res->old_fattr); 508 nfs_post_op_update_inode(new_dir, res->new_fattr); 509 return 1; 510 } 511 512 static int 513 nfs3_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 514 { 515 struct nfs3_linkargs arg = { 516 .fromfh = NFS_FH(inode), 517 .tofh = NFS_FH(dir), 518 .toname = name->name, 519 .tolen = name->len 520 }; 521 struct nfs3_linkres res; 522 struct rpc_message msg = { 523 .rpc_proc = &nfs3_procedures[NFS3PROC_LINK], 524 .rpc_argp = &arg, 525 .rpc_resp = &res, 526 }; 527 int status = -ENOMEM; 528 529 dprintk("NFS call link %s\n", name->name); 530 res.fattr = nfs_alloc_fattr(); 531 res.dir_attr = nfs_alloc_fattr(); 532 if (res.fattr == NULL || res.dir_attr == NULL) 533 goto out; 534 535 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); 536 nfs_post_op_update_inode(dir, res.dir_attr); 537 nfs_post_op_update_inode(inode, res.fattr); 538 out: 539 nfs_free_fattr(res.dir_attr); 540 nfs_free_fattr(res.fattr); 541 dprintk("NFS reply link: %d\n", status); 542 return status; 543 } 544 545 static int 546 nfs3_proc_symlink(struct inode *dir, struct dentry *dentry, struct folio *folio, 547 unsigned int len, struct iattr *sattr) 548 { 549 struct page *page = &folio->page; 550 struct nfs3_createdata *data; 551 struct dentry *d_alias; 552 int status = -ENOMEM; 553 554 if (len > NFS3_MAXPATHLEN) 555 return -ENAMETOOLONG; 556 557 dprintk("NFS call symlink %pd\n", dentry); 558 559 data = nfs3_alloc_createdata(); 560 if (data == NULL) 561 goto out; 562 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_SYMLINK]; 563 data->arg.symlink.fromfh = NFS_FH(dir); 564 data->arg.symlink.fromname = dentry->d_name.name; 565 data->arg.symlink.fromlen = dentry->d_name.len; 566 data->arg.symlink.pages = &page; 567 data->arg.symlink.pathlen = len; 568 data->arg.symlink.sattr = sattr; 569 570 d_alias = nfs3_do_create(dir, dentry, data); 571 status = PTR_ERR_OR_ZERO(d_alias); 572 573 if (status == 0) 574 dput(d_alias); 575 576 nfs3_free_createdata(data); 577 out: 578 dprintk("NFS reply symlink: %d\n", status); 579 return status; 580 } 581 582 static struct dentry * 583 nfs3_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr) 584 { 585 struct posix_acl *default_acl, *acl; 586 struct nfs3_createdata *data; 587 struct dentry *ret = ERR_PTR(-ENOMEM); 588 int status; 589 590 dprintk("NFS call mkdir %pd\n", dentry); 591 592 data = nfs3_alloc_createdata(); 593 if (data == NULL) 594 goto out; 595 596 ret = ERR_PTR(posix_acl_create(dir, &sattr->ia_mode, 597 &default_acl, &acl)); 598 if (IS_ERR(ret)) 599 goto out; 600 601 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKDIR]; 602 data->arg.mkdir.fh = NFS_FH(dir); 603 data->arg.mkdir.name = dentry->d_name.name; 604 data->arg.mkdir.len = dentry->d_name.len; 605 data->arg.mkdir.sattr = sattr; 606 607 ret = nfs3_do_create(dir, dentry, data); 608 609 if (IS_ERR(ret)) 610 goto out_release_acls; 611 612 if (ret) 613 dentry = ret; 614 615 status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl); 616 if (status) { 617 dput(ret); 618 ret = ERR_PTR(status); 619 } 620 621 out_release_acls: 622 posix_acl_release(acl); 623 posix_acl_release(default_acl); 624 out: 625 nfs3_free_createdata(data); 626 dprintk("NFS reply mkdir: %d\n", PTR_ERR_OR_ZERO(ret)); 627 return ret; 628 } 629 630 static int 631 nfs3_proc_rmdir(struct inode *dir, const struct qstr *name) 632 { 633 struct nfs_fattr *dir_attr; 634 struct nfs3_diropargs arg = { 635 .fh = NFS_FH(dir), 636 .name = name->name, 637 .len = name->len 638 }; 639 struct rpc_message msg = { 640 .rpc_proc = &nfs3_procedures[NFS3PROC_RMDIR], 641 .rpc_argp = &arg, 642 }; 643 int status = -ENOMEM; 644 645 dprintk("NFS call rmdir %s\n", name->name); 646 dir_attr = nfs_alloc_fattr(); 647 if (dir_attr == NULL) 648 goto out; 649 650 msg.rpc_resp = dir_attr; 651 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 652 nfs_post_op_update_inode(dir, dir_attr); 653 nfs_free_fattr(dir_attr); 654 out: 655 dprintk("NFS reply rmdir: %d\n", status); 656 return status; 657 } 658 659 /* 660 * The READDIR implementation is somewhat hackish - we pass the user buffer 661 * to the encode function, which installs it in the receive iovec. 662 * The decode function itself doesn't perform any decoding, it just makes 663 * sure the reply is syntactically correct. 664 * 665 * Also note that this implementation handles both plain readdir and 666 * readdirplus. 667 */ 668 static int nfs3_proc_readdir(struct nfs_readdir_arg *nr_arg, 669 struct nfs_readdir_res *nr_res) 670 { 671 struct inode *dir = d_inode(nr_arg->dentry); 672 struct nfs3_readdirargs arg = { 673 .fh = NFS_FH(dir), 674 .cookie = nr_arg->cookie, 675 .plus = nr_arg->plus, 676 .count = nr_arg->page_len, 677 .pages = nr_arg->pages 678 }; 679 struct nfs3_readdirres res = { 680 .verf = nr_res->verf, 681 .plus = nr_arg->plus, 682 }; 683 struct rpc_message msg = { 684 .rpc_proc = &nfs3_procedures[NFS3PROC_READDIR], 685 .rpc_argp = &arg, 686 .rpc_resp = &res, 687 .rpc_cred = nr_arg->cred, 688 }; 689 int status = -ENOMEM; 690 691 if (nr_arg->plus) 692 msg.rpc_proc = &nfs3_procedures[NFS3PROC_READDIRPLUS]; 693 if (arg.cookie) 694 memcpy(arg.verf, nr_arg->verf, sizeof(arg.verf)); 695 696 dprintk("NFS call readdir%s %llu\n", nr_arg->plus ? "plus" : "", 697 (unsigned long long)nr_arg->cookie); 698 699 res.dir_attr = nfs_alloc_fattr(); 700 if (res.dir_attr == NULL) 701 goto out; 702 703 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 704 705 nfs_invalidate_atime(dir); 706 nfs_refresh_inode(dir, res.dir_attr); 707 708 nfs_free_fattr(res.dir_attr); 709 out: 710 dprintk("NFS reply readdir%s: %d\n", nr_arg->plus ? "plus" : "", 711 status); 712 return status; 713 } 714 715 static int 716 nfs3_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 717 dev_t rdev) 718 { 719 struct posix_acl *default_acl, *acl; 720 struct nfs3_createdata *data; 721 struct dentry *d_alias; 722 int status = -ENOMEM; 723 724 dprintk("NFS call mknod %pd %u:%u\n", dentry, 725 MAJOR(rdev), MINOR(rdev)); 726 727 data = nfs3_alloc_createdata(); 728 if (data == NULL) 729 goto out; 730 731 status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl); 732 if (status) 733 goto out; 734 735 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKNOD]; 736 data->arg.mknod.fh = NFS_FH(dir); 737 data->arg.mknod.name = dentry->d_name.name; 738 data->arg.mknod.len = dentry->d_name.len; 739 data->arg.mknod.sattr = sattr; 740 data->arg.mknod.rdev = rdev; 741 742 switch (sattr->ia_mode & S_IFMT) { 743 case S_IFBLK: 744 data->arg.mknod.type = NF3BLK; 745 break; 746 case S_IFCHR: 747 data->arg.mknod.type = NF3CHR; 748 break; 749 case S_IFIFO: 750 data->arg.mknod.type = NF3FIFO; 751 break; 752 case S_IFSOCK: 753 data->arg.mknod.type = NF3SOCK; 754 break; 755 default: 756 status = -EINVAL; 757 goto out_release_acls; 758 } 759 760 d_alias = nfs3_do_create(dir, dentry, data); 761 status = PTR_ERR_OR_ZERO(d_alias); 762 if (status != 0) 763 goto out_release_acls; 764 765 if (d_alias) 766 dentry = d_alias; 767 768 status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl); 769 770 dput(d_alias); 771 out_release_acls: 772 posix_acl_release(acl); 773 posix_acl_release(default_acl); 774 out: 775 nfs3_free_createdata(data); 776 dprintk("NFS reply mknod: %d\n", status); 777 return status; 778 } 779 780 static int 781 nfs3_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 782 struct nfs_fsstat *stat) 783 { 784 struct rpc_message msg = { 785 .rpc_proc = &nfs3_procedures[NFS3PROC_FSSTAT], 786 .rpc_argp = fhandle, 787 .rpc_resp = stat, 788 }; 789 int status; 790 791 dprintk("NFS call fsstat\n"); 792 nfs_fattr_init(stat->fattr); 793 status = rpc_call_sync(server->client, &msg, 0); 794 dprintk("NFS reply fsstat: %d\n", status); 795 return status; 796 } 797 798 static int 799 do_proc_fsinfo(struct rpc_clnt *client, struct nfs_fh *fhandle, 800 struct nfs_fsinfo *info) 801 { 802 struct rpc_message msg = { 803 .rpc_proc = &nfs3_procedures[NFS3PROC_FSINFO], 804 .rpc_argp = fhandle, 805 .rpc_resp = info, 806 }; 807 int status; 808 809 dprintk("NFS call fsinfo\n"); 810 nfs_fattr_init(info->fattr); 811 status = rpc_call_sync(client, &msg, 0); 812 dprintk("NFS reply fsinfo: %d\n", status); 813 return status; 814 } 815 816 /* 817 * Bare-bones access to fsinfo: this is for nfs_get_root/nfs_get_sb via 818 * nfs_create_server 819 */ 820 static int 821 nfs3_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 822 struct nfs_fsinfo *info) 823 { 824 int status; 825 826 status = do_proc_fsinfo(server->client, fhandle, info); 827 if (status && server->nfs_client->cl_rpcclient != server->client) 828 status = do_proc_fsinfo(server->nfs_client->cl_rpcclient, fhandle, info); 829 return status; 830 } 831 832 static int 833 nfs3_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 834 struct nfs_pathconf *info) 835 { 836 struct rpc_message msg = { 837 .rpc_proc = &nfs3_procedures[NFS3PROC_PATHCONF], 838 .rpc_argp = fhandle, 839 .rpc_resp = info, 840 }; 841 int status; 842 843 dprintk("NFS call pathconf\n"); 844 nfs_fattr_init(info->fattr); 845 status = rpc_call_sync(server->client, &msg, 0); 846 dprintk("NFS reply pathconf: %d\n", status); 847 return status; 848 } 849 850 #if IS_ENABLED(CONFIG_NFS_LOCALIO) 851 852 static unsigned nfs3_localio_probe_throttle __read_mostly = 0; 853 module_param(nfs3_localio_probe_throttle, uint, 0644); 854 MODULE_PARM_DESC(nfs3_localio_probe_throttle, 855 "Probe for NFSv3 LOCALIO every N IO requests. Must be power-of-2, defaults to 0 (probing disabled)."); 856 857 static void nfs3_localio_probe(struct nfs_server *server) 858 { 859 struct nfs_client *clp = server->nfs_client; 860 861 /* Throttled to reduce nfs_local_probe_async() frequency */ 862 if (!nfs3_localio_probe_throttle || nfs_server_is_local(clp)) 863 return; 864 865 /* 866 * Try (re)enabling LOCALIO if isn't enabled -- admin deems 867 * it worthwhile to periodically check if LOCALIO possible by 868 * setting the 'nfs3_localio_probe_throttle' module parameter. 869 * 870 * This is useful if LOCALIO was previously enabled, but was 871 * disabled due to server restart, and IO has successfully 872 * completed in terms of normal RPC. 873 */ 874 if ((clp->cl_uuid.nfs3_localio_probe_count++ & 875 (nfs3_localio_probe_throttle - 1)) == 0) { 876 if (!nfs_server_is_local(clp)) 877 nfs_local_probe_async(clp); 878 } 879 } 880 881 #else 882 static void nfs3_localio_probe(struct nfs_server *server) {} 883 #endif 884 885 static int nfs3_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 886 { 887 struct inode *inode = hdr->inode; 888 struct nfs_server *server = NFS_SERVER(inode); 889 890 if (hdr->pgio_done_cb != NULL) 891 return hdr->pgio_done_cb(task, hdr); 892 893 if (nfs3_async_handle_jukebox(task, inode)) 894 return -EAGAIN; 895 896 if (task->tk_status >= 0) { 897 if (!server->read_hdrsize) 898 cmpxchg(&server->read_hdrsize, 0, hdr->res.replen); 899 nfs3_localio_probe(server); 900 } 901 902 nfs_invalidate_atime(inode); 903 nfs_refresh_inode(inode, &hdr->fattr); 904 return 0; 905 } 906 907 static void nfs3_proc_read_setup(struct nfs_pgio_header *hdr, 908 struct rpc_message *msg) 909 { 910 msg->rpc_proc = &nfs3_procedures[NFS3PROC_READ]; 911 hdr->args.replen = NFS_SERVER(hdr->inode)->read_hdrsize; 912 } 913 914 static int nfs3_proc_pgio_rpc_prepare(struct rpc_task *task, 915 struct nfs_pgio_header *hdr) 916 { 917 rpc_call_start(task); 918 return 0; 919 } 920 921 static int nfs3_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 922 { 923 struct inode *inode = hdr->inode; 924 925 if (hdr->pgio_done_cb != NULL) 926 return hdr->pgio_done_cb(task, hdr); 927 928 if (nfs3_async_handle_jukebox(task, inode)) 929 return -EAGAIN; 930 if (task->tk_status >= 0) { 931 nfs_writeback_update_inode(hdr); 932 nfs3_localio_probe(NFS_SERVER(inode)); 933 } 934 return 0; 935 } 936 937 static void nfs3_proc_write_setup(struct nfs_pgio_header *hdr, 938 struct rpc_message *msg, 939 struct rpc_clnt **clnt) 940 { 941 msg->rpc_proc = &nfs3_procedures[NFS3PROC_WRITE]; 942 } 943 944 static void nfs3_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data) 945 { 946 rpc_call_start(task); 947 } 948 949 static int nfs3_commit_done(struct rpc_task *task, struct nfs_commit_data *data) 950 { 951 if (data->commit_done_cb != NULL) 952 return data->commit_done_cb(task, data); 953 954 if (nfs3_async_handle_jukebox(task, data->inode)) 955 return -EAGAIN; 956 nfs_refresh_inode(data->inode, data->res.fattr); 957 return 0; 958 } 959 960 static void nfs3_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg, 961 struct rpc_clnt **clnt) 962 { 963 msg->rpc_proc = &nfs3_procedures[NFS3PROC_COMMIT]; 964 } 965 966 static void nfs3_nlm_alloc_call(void *data) 967 { 968 struct nfs_lock_context *l_ctx = data; 969 if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags)) { 970 get_nfs_open_context(l_ctx->open_context); 971 nfs_get_lock_context(l_ctx->open_context); 972 } 973 } 974 975 static bool nfs3_nlm_unlock_prepare(struct rpc_task *task, void *data) 976 { 977 struct nfs_lock_context *l_ctx = data; 978 if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags)) 979 return nfs_async_iocounter_wait(task, l_ctx); 980 return false; 981 982 } 983 984 static void nfs3_nlm_release_call(void *data) 985 { 986 struct nfs_lock_context *l_ctx = data; 987 struct nfs_open_context *ctx; 988 if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags)) { 989 ctx = l_ctx->open_context; 990 nfs_put_lock_context(l_ctx); 991 put_nfs_open_context(ctx); 992 } 993 } 994 995 static const struct nlmclnt_operations nlmclnt_fl_close_lock_ops = { 996 .nlmclnt_alloc_call = nfs3_nlm_alloc_call, 997 .nlmclnt_unlock_prepare = nfs3_nlm_unlock_prepare, 998 .nlmclnt_release_call = nfs3_nlm_release_call, 999 }; 1000 1001 static int 1002 nfs3_proc_lock(struct file *filp, int cmd, struct file_lock *fl) 1003 { 1004 struct inode *inode = file_inode(filp); 1005 struct nfs_lock_context *l_ctx = NULL; 1006 struct nfs_open_context *ctx = nfs_file_open_context(filp); 1007 int status; 1008 1009 if (fl->c.flc_flags & FL_CLOSE) { 1010 l_ctx = nfs_get_lock_context(ctx); 1011 if (IS_ERR(l_ctx)) 1012 l_ctx = NULL; 1013 else 1014 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags); 1015 } 1016 1017 status = nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl, l_ctx); 1018 1019 if (l_ctx) 1020 nfs_put_lock_context(l_ctx); 1021 1022 return status; 1023 } 1024 1025 static int nfs3_have_delegation(struct inode *inode, fmode_t type, int flags) 1026 { 1027 return 0; 1028 } 1029 1030 static int nfs3_return_delegation(struct inode *inode) 1031 { 1032 if (S_ISREG(inode->i_mode)) 1033 nfs_wb_all(inode); 1034 return 0; 1035 } 1036 1037 static const struct inode_operations nfs3_dir_inode_operations = { 1038 .create = nfs_create, 1039 .atomic_open = nfs_atomic_open_v23, 1040 .lookup = nfs_lookup, 1041 .link = nfs_link, 1042 .unlink = nfs_unlink, 1043 .symlink = nfs_symlink, 1044 .mkdir = nfs_mkdir, 1045 .rmdir = nfs_rmdir, 1046 .mknod = nfs_mknod, 1047 .rename = nfs_rename, 1048 .permission = nfs_permission, 1049 .getattr = nfs_getattr, 1050 .setattr = nfs_setattr, 1051 #ifdef CONFIG_NFS_V3_ACL 1052 .listxattr = nfs3_listxattr, 1053 .get_inode_acl = nfs3_get_acl, 1054 .set_acl = nfs3_set_acl, 1055 #endif 1056 }; 1057 1058 static const struct inode_operations nfs3_file_inode_operations = { 1059 .permission = nfs_permission, 1060 .getattr = nfs_getattr, 1061 .setattr = nfs_setattr, 1062 #ifdef CONFIG_NFS_V3_ACL 1063 .listxattr = nfs3_listxattr, 1064 .get_inode_acl = nfs3_get_acl, 1065 .set_acl = nfs3_set_acl, 1066 #endif 1067 }; 1068 1069 const struct nfs_rpc_ops nfs_v3_clientops = { 1070 .version = 3, /* protocol version */ 1071 .dentry_ops = &nfs_dentry_operations, 1072 .dir_inode_ops = &nfs3_dir_inode_operations, 1073 .file_inode_ops = &nfs3_file_inode_operations, 1074 .file_ops = &nfs_file_operations, 1075 .nlmclnt_ops = &nlmclnt_fl_close_lock_ops, 1076 .getroot = nfs3_proc_get_root, 1077 .submount = nfs_submount, 1078 .try_get_tree = nfs_try_get_tree, 1079 .getattr = nfs3_proc_getattr, 1080 .setattr = nfs3_proc_setattr, 1081 .lookup = nfs3_proc_lookup, 1082 .lookupp = nfs3_proc_lookupp, 1083 .access = nfs3_proc_access, 1084 .readlink = nfs3_proc_readlink, 1085 .create = nfs3_proc_create, 1086 .remove = nfs3_proc_remove, 1087 .unlink_setup = nfs3_proc_unlink_setup, 1088 .unlink_rpc_prepare = nfs3_proc_unlink_rpc_prepare, 1089 .unlink_done = nfs3_proc_unlink_done, 1090 .rename_setup = nfs3_proc_rename_setup, 1091 .rename_rpc_prepare = nfs3_proc_rename_rpc_prepare, 1092 .rename_done = nfs3_proc_rename_done, 1093 .link = nfs3_proc_link, 1094 .symlink = nfs3_proc_symlink, 1095 .mkdir = nfs3_proc_mkdir, 1096 .rmdir = nfs3_proc_rmdir, 1097 .readdir = nfs3_proc_readdir, 1098 .mknod = nfs3_proc_mknod, 1099 .statfs = nfs3_proc_statfs, 1100 .fsinfo = nfs3_proc_fsinfo, 1101 .pathconf = nfs3_proc_pathconf, 1102 .decode_dirent = nfs3_decode_dirent, 1103 .pgio_rpc_prepare = nfs3_proc_pgio_rpc_prepare, 1104 .read_setup = nfs3_proc_read_setup, 1105 .read_done = nfs3_read_done, 1106 .write_setup = nfs3_proc_write_setup, 1107 .write_done = nfs3_write_done, 1108 .commit_setup = nfs3_proc_commit_setup, 1109 .commit_rpc_prepare = nfs3_proc_commit_rpc_prepare, 1110 .commit_done = nfs3_commit_done, 1111 .lock = nfs3_proc_lock, 1112 .clear_acl_cache = forget_all_cached_acls, 1113 .close_context = nfs_close_context, 1114 .have_delegation = nfs3_have_delegation, 1115 .return_delegation = nfs3_return_delegation, 1116 .alloc_client = nfs_alloc_client, 1117 .init_client = nfs_init_client, 1118 .free_client = nfs_free_client, 1119 .create_server = nfs3_create_server, 1120 .clone_server = nfs3_clone_server, 1121 }; 1122