fs/nfs/nfs3proc.c

   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                 freezable_schedule_timeout_killable_unsafe(NFS_JUKEBOX_RETRY_TIME);
  40                 res = -ERESTARTSYS;
  41         } while (!fatal_signal_pending(current));
  42         return res;
  43 }
  44
  45 #define rpc_call_sync(clnt, msg, flags) nfs3_rpc_wrapper(clnt, msg, flags)
  46
  47 static int
  48 nfs3_async_handle_jukebox(struct rpc_task *task, struct inode *inode)
  49 {
  50         if (task->tk_status != -EJUKEBOX)
  51                 return 0;
  52         if (task->tk_status == -EJUKEBOX)
  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 nfs4_label *label,
 105                 struct inode *inode)
 106 {
 107         struct rpc_message msg = {
 108                 .rpc_proc       = &nfs3_procedures[NFS3PROC_GETATTR],
 109                 .rpc_argp       = fhandle,
 110                 .rpc_resp       = fattr,
 111         };
 112         int     status;
 113         unsigned short task_flags = 0;
 114
 115         /* Is this is an attribute revalidation, subject to softreval? */
 116         if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
 117                 task_flags |= RPC_TASK_TIMEOUT;
 118
 119         dprintk("NFS call  getattr\n");
 120         nfs_fattr_init(fattr);
 121         status = rpc_call_sync(server->client, &msg, task_flags);
 122         dprintk("NFS reply getattr: %d\n", status);
 123         return status;
 124 }
 125
 126 static int
 127 nfs3_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
 128                         struct iattr *sattr)
 129 {
 130         struct inode *inode = d_inode(dentry);
 131         struct nfs3_sattrargs   arg = {
 132                 .fh             = NFS_FH(inode),
 133                 .sattr          = sattr,
 134         };
 135         struct rpc_message msg = {
 136                 .rpc_proc       = &nfs3_procedures[NFS3PROC_SETATTR],
 137                 .rpc_argp       = &arg,
 138                 .rpc_resp       = fattr,
 139         };
 140         int     status;
 141
 142         dprintk("NFS call  setattr\n");
 143         if (sattr->ia_valid & ATTR_FILE)
 144                 msg.rpc_cred = nfs_file_cred(sattr->ia_file);
 145         nfs_fattr_init(fattr);
 146         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 147         if (status == 0) {
 148                 nfs_setattr_update_inode(inode, sattr, fattr);
 149                 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
 150                         nfs_zap_acl_cache(inode);
 151         }
 152         dprintk("NFS reply setattr: %d\n", status);
 153         return status;
 154 }
 155
 156 static int
 157 nfs3_proc_lookup(struct inode *dir, struct dentry *dentry,
 158                  struct nfs_fh *fhandle, struct nfs_fattr *fattr,
 159                  struct nfs4_label *label)
 160 {
 161         struct nfs3_diropargs   arg = {
 162                 .fh             = NFS_FH(dir),
 163                 .name           = dentry->d_name.name,
 164                 .len            = dentry->d_name.len
 165         };
 166         struct nfs3_diropres    res = {
 167                 .fh             = fhandle,
 168                 .fattr          = fattr
 169         };
 170         struct rpc_message msg = {
 171                 .rpc_proc       = &nfs3_procedures[NFS3PROC_LOOKUP],
 172                 .rpc_argp       = &arg,
 173                 .rpc_resp       = &res,
 174         };
 175         int                     status;
 176         unsigned short task_flags = 0;
 177
 178         /* Is this is an attribute revalidation, subject to softreval? */
 179         if (nfs_lookup_is_soft_revalidate(dentry))
 180                 task_flags |= RPC_TASK_TIMEOUT;
 181
 182         dprintk("NFS call  lookup %pd2\n", dentry);
 183         res.dir_attr = nfs_alloc_fattr();
 184         if (res.dir_attr == NULL)
 185                 return -ENOMEM;
 186
 187         nfs_fattr_init(fattr);
 188         status = rpc_call_sync(NFS_CLIENT(dir), &msg, task_flags);
 189         nfs_refresh_inode(dir, res.dir_attr);
 190         if (status >= 0 && !(fattr->valid & NFS_ATTR_FATTR)) {
 191                 msg.rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR];
 192                 msg.rpc_argp = fhandle;
 193                 msg.rpc_resp = fattr;
 194                 status = rpc_call_sync(NFS_CLIENT(dir), &msg, task_flags);
 195         }
 196         nfs_free_fattr(res.dir_attr);
 197         dprintk("NFS reply lookup: %d\n", status);
 198         return status;
 199 }
 200
 201 static int nfs3_proc_access(struct inode *inode, struct nfs_access_entry *entry)
 202 {
 203         struct nfs3_accessargs  arg = {
 204                 .fh             = NFS_FH(inode),
 205                 .access         = entry->mask,
 206         };
 207         struct nfs3_accessres   res;
 208         struct rpc_message msg = {
 209                 .rpc_proc       = &nfs3_procedures[NFS3PROC_ACCESS],
 210                 .rpc_argp       = &arg,
 211                 .rpc_resp       = &res,
 212                 .rpc_cred       = entry->cred,
 213         };
 214         int status = -ENOMEM;
 215
 216         dprintk("NFS call  access\n");
 217         res.fattr = nfs_alloc_fattr();
 218         if (res.fattr == NULL)
 219                 goto out;
 220
 221         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 222         nfs_refresh_inode(inode, res.fattr);
 223         if (status == 0)
 224                 nfs_access_set_mask(entry, res.access);
 225         nfs_free_fattr(res.fattr);
 226 out:
 227         dprintk("NFS reply access: %d\n", status);
 228         return status;
 229 }
 230
 231 static int nfs3_proc_readlink(struct inode *inode, struct page *page,
 232                 unsigned int pgbase, unsigned int pglen)
 233 {
 234         struct nfs_fattr        *fattr;
 235         struct nfs3_readlinkargs args = {
 236                 .fh             = NFS_FH(inode),
 237                 .pgbase         = pgbase,
 238                 .pglen          = pglen,
 239                 .pages          = &page
 240         };
 241         struct rpc_message msg = {
 242                 .rpc_proc       = &nfs3_procedures[NFS3PROC_READLINK],
 243                 .rpc_argp       = &args,
 244         };
 245         int status = -ENOMEM;
 246
 247         dprintk("NFS call  readlink\n");
 248         fattr = nfs_alloc_fattr();
 249         if (fattr == NULL)
 250                 goto out;
 251         msg.rpc_resp = fattr;
 252
 253         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 254         nfs_refresh_inode(inode, fattr);
 255         nfs_free_fattr(fattr);
 256 out:
 257         dprintk("NFS reply readlink: %d\n", status);
 258         return status;
 259 }
 260
 261 struct nfs3_createdata {
 262         struct rpc_message msg;
 263         union {
 264                 struct nfs3_createargs create;
 265                 struct nfs3_mkdirargs mkdir;
 266                 struct nfs3_symlinkargs symlink;
 267                 struct nfs3_mknodargs mknod;
 268         } arg;
 269         struct nfs3_diropres res;
 270         struct nfs_fh fh;
 271         struct nfs_fattr fattr;
 272         struct nfs_fattr dir_attr;
 273 };
 274
 275 static struct nfs3_createdata *nfs3_alloc_createdata(void)
 276 {
 277         struct nfs3_createdata *data;
 278
 279         data = kzalloc(sizeof(*data), GFP_KERNEL);
 280         if (data != NULL) {
 281                 data->msg.rpc_argp = &data->arg;
 282                 data->msg.rpc_resp = &data->res;
 283                 data->res.fh = &data->fh;
 284                 data->res.fattr = &data->fattr;
 285                 data->res.dir_attr = &data->dir_attr;
 286                 nfs_fattr_init(data->res.fattr);
 287                 nfs_fattr_init(data->res.dir_attr);
 288         }
 289         return data;
 290 }
 291
 292 static struct dentry *
 293 nfs3_do_create(struct inode *dir, struct dentry *dentry, struct nfs3_createdata *data)
 294 {
 295         int status;
 296
 297         status = rpc_call_sync(NFS_CLIENT(dir), &data->msg, 0);
 298         nfs_post_op_update_inode(dir, data->res.dir_attr);
 299         if (status != 0)
 300                 return ERR_PTR(status);
 301
 302         return nfs_add_or_obtain(dentry, data->res.fh, data->res.fattr, NULL);
 303 }
 304
 305 static void nfs3_free_createdata(struct nfs3_createdata *data)
 306 {
 307         kfree(data);
 308 }
 309
 310 /*
 311  * Create a regular file.
 312  */
 313 static int
 314 nfs3_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
 315                  int flags)
 316 {
 317         struct posix_acl *default_acl, *acl;
 318         struct nfs3_createdata *data;
 319         struct dentry *d_alias;
 320         int status = -ENOMEM;
 321
 322         dprintk("NFS call  create %pd\n", dentry);
 323
 324         data = nfs3_alloc_createdata();
 325         if (data == NULL)
 326                 goto out;
 327
 328         data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_CREATE];
 329         data->arg.create.fh = NFS_FH(dir);
 330         data->arg.create.name = dentry->d_name.name;
 331         data->arg.create.len = dentry->d_name.len;
 332         data->arg.create.sattr = sattr;
 333
 334         data->arg.create.createmode = NFS3_CREATE_UNCHECKED;
 335         if (flags & O_EXCL) {
 336                 data->arg.create.createmode  = NFS3_CREATE_EXCLUSIVE;
 337                 data->arg.create.verifier[0] = cpu_to_be32(jiffies);
 338                 data->arg.create.verifier[1] = cpu_to_be32(current->pid);
 339         }
 340
 341         status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
 342         if (status)
 343                 goto out;
 344
 345         for (;;) {
 346                 d_alias = nfs3_do_create(dir, dentry, data);
 347                 status = PTR_ERR_OR_ZERO(d_alias);
 348
 349                 if (status != -ENOTSUPP)
 350                         break;
 351                 /* If the server doesn't support the exclusive creation
 352                  * semantics, try again with simple 'guarded' mode. */
 353                 switch (data->arg.create.createmode) {
 354                         case NFS3_CREATE_EXCLUSIVE:
 355                                 data->arg.create.createmode = NFS3_CREATE_GUARDED;
 356                                 break;
 357
 358                         case NFS3_CREATE_GUARDED:
 359                                 data->arg.create.createmode = NFS3_CREATE_UNCHECKED;
 360                                 break;
 361
 362                         case NFS3_CREATE_UNCHECKED:
 363                                 goto out;
 364                 }
 365                 nfs_fattr_init(data->res.dir_attr);
 366                 nfs_fattr_init(data->res.fattr);
 367         }
 368
 369         if (status != 0)
 370                 goto out_release_acls;
 371
 372         if (d_alias)
 373                 dentry = d_alias;
 374
 375         /* When we created the file with exclusive semantics, make
 376          * sure we set the attributes afterwards. */
 377         if (data->arg.create.createmode == NFS3_CREATE_EXCLUSIVE) {
 378                 dprintk("NFS call  setattr (post-create)\n");
 379
 380                 if (!(sattr->ia_valid & ATTR_ATIME_SET))
 381                         sattr->ia_valid |= ATTR_ATIME;
 382                 if (!(sattr->ia_valid & ATTR_MTIME_SET))
 383                         sattr->ia_valid |= ATTR_MTIME;
 384
 385                 /* Note: we could use a guarded setattr here, but I'm
 386                  * not sure this buys us anything (and I'd have
 387                  * to revamp the NFSv3 XDR code) */
 388                 status = nfs3_proc_setattr(dentry, data->res.fattr, sattr);
 389                 nfs_post_op_update_inode(d_inode(dentry), data->res.fattr);
 390                 dprintk("NFS reply setattr (post-create): %d\n", status);
 391                 if (status != 0)
 392                         goto out_dput;
 393         }
 394
 395         status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
 396
 397 out_dput:
 398         dput(d_alias);
 399 out_release_acls:
 400         posix_acl_release(acl);
 401         posix_acl_release(default_acl);
 402 out:
 403         nfs3_free_createdata(data);
 404         dprintk("NFS reply create: %d\n", status);
 405         return status;
 406 }
 407
 408 static int
 409 nfs3_proc_remove(struct inode *dir, struct dentry *dentry)
 410 {
 411         struct nfs_removeargs arg = {
 412                 .fh = NFS_FH(dir),
 413                 .name = dentry->d_name,
 414         };
 415         struct nfs_removeres res;
 416         struct rpc_message msg = {
 417                 .rpc_proc = &nfs3_procedures[NFS3PROC_REMOVE],
 418                 .rpc_argp = &arg,
 419                 .rpc_resp = &res,
 420         };
 421         int status = -ENOMEM;
 422
 423         dprintk("NFS call  remove %pd2\n", dentry);
 424         res.dir_attr = nfs_alloc_fattr();
 425         if (res.dir_attr == NULL)
 426                 goto out;
 427
 428         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 429         nfs_post_op_update_inode(dir, res.dir_attr);
 430         nfs_free_fattr(res.dir_attr);
 431 out:
 432         dprintk("NFS reply remove: %d\n", status);
 433         return status;
 434 }
 435
 436 static void
 437 nfs3_proc_unlink_setup(struct rpc_message *msg,
 438                 struct dentry *dentry,
 439                 struct inode *inode)
 440 {
 441         msg->rpc_proc = &nfs3_procedures[NFS3PROC_REMOVE];
 442 }
 443
 444 static void nfs3_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
 445 {
 446         rpc_call_start(task);
 447 }
 448
 449 static int
 450 nfs3_proc_unlink_done(struct rpc_task *task, struct inode *dir)
 451 {
 452         struct nfs_removeres *res;
 453         if (nfs3_async_handle_jukebox(task, dir))
 454                 return 0;
 455         res = task->tk_msg.rpc_resp;
 456         nfs_post_op_update_inode(dir, res->dir_attr);
 457         return 1;
 458 }
 459
 460 static void
 461 nfs3_proc_rename_setup(struct rpc_message *msg,
 462                 struct dentry *old_dentry,
 463                 struct dentry *new_dentry)
 464 {
 465         msg->rpc_proc = &nfs3_procedures[NFS3PROC_RENAME];
 466 }
 467
 468 static void nfs3_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
 469 {
 470         rpc_call_start(task);
 471 }
 472
 473 static int
 474 nfs3_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
 475                       struct inode *new_dir)
 476 {
 477         struct nfs_renameres *res;
 478
 479         if (nfs3_async_handle_jukebox(task, old_dir))
 480                 return 0;
 481         res = task->tk_msg.rpc_resp;
 482
 483         nfs_post_op_update_inode(old_dir, res->old_fattr);
 484         nfs_post_op_update_inode(new_dir, res->new_fattr);
 485         return 1;
 486 }
 487
 488 static int
 489 nfs3_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
 490 {
 491         struct nfs3_linkargs    arg = {
 492                 .fromfh         = NFS_FH(inode),
 493                 .tofh           = NFS_FH(dir),
 494                 .toname         = name->name,
 495                 .tolen          = name->len
 496         };
 497         struct nfs3_linkres     res;
 498         struct rpc_message msg = {
 499                 .rpc_proc       = &nfs3_procedures[NFS3PROC_LINK],
 500                 .rpc_argp       = &arg,
 501                 .rpc_resp       = &res,
 502         };
 503         int status = -ENOMEM;
 504
 505         dprintk("NFS call  link %s\n", name->name);
 506         res.fattr = nfs_alloc_fattr();
 507         res.dir_attr = nfs_alloc_fattr();
 508         if (res.fattr == NULL || res.dir_attr == NULL)
 509                 goto out;
 510
 511         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 512         nfs_post_op_update_inode(dir, res.dir_attr);
 513         nfs_post_op_update_inode(inode, res.fattr);
 514 out:
 515         nfs_free_fattr(res.dir_attr);
 516         nfs_free_fattr(res.fattr);
 517         dprintk("NFS reply link: %d\n", status);
 518         return status;
 519 }
 520
 521 static int
 522 nfs3_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
 523                   unsigned int len, struct iattr *sattr)
 524 {
 525         struct nfs3_createdata *data;
 526         struct dentry *d_alias;
 527         int status = -ENOMEM;
 528
 529         if (len > NFS3_MAXPATHLEN)
 530                 return -ENAMETOOLONG;
 531
 532         dprintk("NFS call  symlink %pd\n", dentry);
 533
 534         data = nfs3_alloc_createdata();
 535         if (data == NULL)
 536                 goto out;
 537         data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_SYMLINK];
 538         data->arg.symlink.fromfh = NFS_FH(dir);
 539         data->arg.symlink.fromname = dentry->d_name.name;
 540         data->arg.symlink.fromlen = dentry->d_name.len;
 541         data->arg.symlink.pages = &page;
 542         data->arg.symlink.pathlen = len;
 543         data->arg.symlink.sattr = sattr;
 544
 545         d_alias = nfs3_do_create(dir, dentry, data);
 546         status = PTR_ERR_OR_ZERO(d_alias);
 547
 548         if (status == 0)
 549                 dput(d_alias);
 550
 551         nfs3_free_createdata(data);
 552 out:
 553         dprintk("NFS reply symlink: %d\n", status);
 554         return status;
 555 }
 556
 557 static int
 558 nfs3_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
 559 {
 560         struct posix_acl *default_acl, *acl;
 561         struct nfs3_createdata *data;
 562         struct dentry *d_alias;
 563         int status = -ENOMEM;
 564
 565         dprintk("NFS call  mkdir %pd\n", dentry);
 566
 567         data = nfs3_alloc_createdata();
 568         if (data == NULL)
 569                 goto out;
 570
 571         status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
 572         if (status)
 573                 goto out;
 574
 575         data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKDIR];
 576         data->arg.mkdir.fh = NFS_FH(dir);
 577         data->arg.mkdir.name = dentry->d_name.name;
 578         data->arg.mkdir.len = dentry->d_name.len;
 579         data->arg.mkdir.sattr = sattr;
 580
 581         d_alias = nfs3_do_create(dir, dentry, data);
 582         status = PTR_ERR_OR_ZERO(d_alias);
 583
 584         if (status != 0)
 585                 goto out_release_acls;
 586
 587         if (d_alias)
 588                 dentry = d_alias;
 589
 590         status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
 591
 592         dput(d_alias);
 593 out_release_acls:
 594         posix_acl_release(acl);
 595         posix_acl_release(default_acl);
 596 out:
 597         nfs3_free_createdata(data);
 598         dprintk("NFS reply mkdir: %d\n", status);
 599         return status;
 600 }
 601
 602 static int
 603 nfs3_proc_rmdir(struct inode *dir, const struct qstr *name)
 604 {
 605         struct nfs_fattr        *dir_attr;
 606         struct nfs3_diropargs   arg = {
 607                 .fh             = NFS_FH(dir),
 608                 .name           = name->name,
 609                 .len            = name->len
 610         };
 611         struct rpc_message msg = {
 612                 .rpc_proc       = &nfs3_procedures[NFS3PROC_RMDIR],
 613                 .rpc_argp       = &arg,
 614         };
 615         int status = -ENOMEM;
 616
 617         dprintk("NFS call  rmdir %s\n", name->name);
 618         dir_attr = nfs_alloc_fattr();
 619         if (dir_attr == NULL)
 620                 goto out;
 621
 622         msg.rpc_resp = dir_attr;
 623         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 624         nfs_post_op_update_inode(dir, dir_attr);
 625         nfs_free_fattr(dir_attr);
 626 out:
 627         dprintk("NFS reply rmdir: %d\n", status);
 628         return status;
 629 }
 630
 631 /*
 632  * The READDIR implementation is somewhat hackish - we pass the user buffer
 633  * to the encode function, which installs it in the receive iovec.
 634  * The decode function itself doesn't perform any decoding, it just makes
 635  * sure the reply is syntactically correct.
 636  *
 637  * Also note that this implementation handles both plain readdir and
 638  * readdirplus.
 639  */
 640 static int
 641 nfs3_proc_readdir(struct dentry *dentry, const struct cred *cred,
 642                   u64 cookie, struct page **pages, unsigned int count, bool plus)
 643 {
 644         struct inode            *dir = d_inode(dentry);
 645         __be32                  *verf = NFS_I(dir)->cookieverf;
 646         struct nfs3_readdirargs arg = {
 647                 .fh             = NFS_FH(dir),
 648                 .cookie         = cookie,
 649                 .verf           = {verf[0], verf[1]},
 650                 .plus           = plus,
 651                 .count          = count,
 652                 .pages          = pages
 653         };
 654         struct nfs3_readdirres  res = {
 655                 .verf           = verf,
 656                 .plus           = plus
 657         };
 658         struct rpc_message      msg = {
 659                 .rpc_proc       = &nfs3_procedures[NFS3PROC_READDIR],
 660                 .rpc_argp       = &arg,
 661                 .rpc_resp       = &res,
 662                 .rpc_cred       = cred,
 663         };
 664         int status = -ENOMEM;
 665
 666         if (plus)
 667                 msg.rpc_proc = &nfs3_procedures[NFS3PROC_READDIRPLUS];
 668
 669         dprintk("NFS call  readdir%s %d\n",
 670                         plus? "plus" : "", (unsigned int) cookie);
 671
 672         res.dir_attr = nfs_alloc_fattr();
 673         if (res.dir_attr == NULL)
 674                 goto out;
 675
 676         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 677
 678         nfs_invalidate_atime(dir);
 679         nfs_refresh_inode(dir, res.dir_attr);
 680
 681         nfs_free_fattr(res.dir_attr);
 682 out:
 683         dprintk("NFS reply readdir%s: %d\n",
 684                         plus? "plus" : "", status);
 685         return status;
 686 }
 687
 688 static int
 689 nfs3_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
 690                 dev_t rdev)
 691 {
 692         struct posix_acl *default_acl, *acl;
 693         struct nfs3_createdata *data;
 694         struct dentry *d_alias;
 695         int status = -ENOMEM;
 696
 697         dprintk("NFS call  mknod %pd %u:%u\n", dentry,
 698                         MAJOR(rdev), MINOR(rdev));
 699
 700         data = nfs3_alloc_createdata();
 701         if (data == NULL)
 702                 goto out;
 703
 704         status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
 705         if (status)
 706                 goto out;
 707
 708         data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKNOD];
 709         data->arg.mknod.fh = NFS_FH(dir);
 710         data->arg.mknod.name = dentry->d_name.name;
 711         data->arg.mknod.len = dentry->d_name.len;
 712         data->arg.mknod.sattr = sattr;
 713         data->arg.mknod.rdev = rdev;
 714
 715         switch (sattr->ia_mode & S_IFMT) {
 716         case S_IFBLK:
 717                 data->arg.mknod.type = NF3BLK;
 718                 break;
 719         case S_IFCHR:
 720                 data->arg.mknod.type = NF3CHR;
 721                 break;
 722         case S_IFIFO:
 723                 data->arg.mknod.type = NF3FIFO;
 724                 break;
 725         case S_IFSOCK:
 726                 data->arg.mknod.type = NF3SOCK;
 727                 break;
 728         default:
 729                 status = -EINVAL;
 730                 goto out;
 731         }
 732
 733         d_alias = nfs3_do_create(dir, dentry, data);
 734         status = PTR_ERR_OR_ZERO(d_alias);
 735         if (status != 0)
 736                 goto out_release_acls;
 737
 738         if (d_alias)
 739                 dentry = d_alias;
 740
 741         status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
 742
 743         dput(d_alias);
 744 out_release_acls:
 745         posix_acl_release(acl);
 746         posix_acl_release(default_acl);
 747 out:
 748         nfs3_free_createdata(data);
 749         dprintk("NFS reply mknod: %d\n", status);
 750         return status;
 751 }
 752
 753 static int
 754 nfs3_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
 755                  struct nfs_fsstat *stat)
 756 {
 757         struct rpc_message msg = {
 758                 .rpc_proc       = &nfs3_procedures[NFS3PROC_FSSTAT],
 759                 .rpc_argp       = fhandle,
 760                 .rpc_resp       = stat,
 761         };
 762         int     status;
 763
 764         dprintk("NFS call  fsstat\n");
 765         nfs_fattr_init(stat->fattr);
 766         status = rpc_call_sync(server->client, &msg, 0);
 767         dprintk("NFS reply fsstat: %d\n", status);
 768         return status;
 769 }
 770
 771 static int
 772 do_proc_fsinfo(struct rpc_clnt *client, struct nfs_fh *fhandle,
 773                  struct nfs_fsinfo *info)
 774 {
 775         struct rpc_message msg = {
 776                 .rpc_proc       = &nfs3_procedures[NFS3PROC_FSINFO],
 777                 .rpc_argp       = fhandle,
 778                 .rpc_resp       = info,
 779         };
 780         int     status;
 781
 782         dprintk("NFS call  fsinfo\n");
 783         nfs_fattr_init(info->fattr);
 784         status = rpc_call_sync(client, &msg, 0);
 785         dprintk("NFS reply fsinfo: %d\n", status);
 786         return status;
 787 }
 788
 789 /*
 790  * Bare-bones access to fsinfo: this is for nfs_get_root/nfs_get_sb via
 791  * nfs_create_server
 792  */
 793 static int
 794 nfs3_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
 795                    struct nfs_fsinfo *info)
 796 {
 797         int     status;
 798
 799         status = do_proc_fsinfo(server->client, fhandle, info);
 800         if (status && server->nfs_client->cl_rpcclient != server->client)
 801                 status = do_proc_fsinfo(server->nfs_client->cl_rpcclient, fhandle, info);
 802         return status;
 803 }
 804
 805 static int
 806 nfs3_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
 807                    struct nfs_pathconf *info)
 808 {
 809         struct rpc_message msg = {
 810                 .rpc_proc       = &nfs3_procedures[NFS3PROC_PATHCONF],
 811                 .rpc_argp       = fhandle,
 812                 .rpc_resp       = info,
 813         };
 814         int     status;
 815
 816         dprintk("NFS call  pathconf\n");
 817         nfs_fattr_init(info->fattr);
 818         status = rpc_call_sync(server->client, &msg, 0);
 819         dprintk("NFS reply pathconf: %d\n", status);
 820         return status;
 821 }
 822
 823 static int nfs3_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
 824 {
 825         struct inode *inode = hdr->inode;
 826         struct nfs_server *server = NFS_SERVER(inode);
 827
 828         if (hdr->pgio_done_cb != NULL)
 829                 return hdr->pgio_done_cb(task, hdr);
 830
 831         if (nfs3_async_handle_jukebox(task, inode))
 832                 return -EAGAIN;
 833
 834         if (task->tk_status >= 0 && !server->read_hdrsize)
 835                 cmpxchg(&server->read_hdrsize, 0, hdr->res.replen);
 836
 837         nfs_invalidate_atime(inode);
 838         nfs_refresh_inode(inode, &hdr->fattr);
 839         return 0;
 840 }
 841
 842 static void nfs3_proc_read_setup(struct nfs_pgio_header *hdr,
 843                                  struct rpc_message *msg)
 844 {
 845         msg->rpc_proc = &nfs3_procedures[NFS3PROC_READ];
 846         hdr->args.replen = NFS_SERVER(hdr->inode)->read_hdrsize;
 847 }
 848
 849 static int nfs3_proc_pgio_rpc_prepare(struct rpc_task *task,
 850                                       struct nfs_pgio_header *hdr)
 851 {
 852         rpc_call_start(task);
 853         return 0;
 854 }
 855
 856 static int nfs3_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
 857 {
 858         struct inode *inode = hdr->inode;
 859
 860         if (hdr->pgio_done_cb != NULL)
 861                 return hdr->pgio_done_cb(task, hdr);
 862
 863         if (nfs3_async_handle_jukebox(task, inode))
 864                 return -EAGAIN;
 865         if (task->tk_status >= 0)
 866                 nfs_writeback_update_inode(hdr);
 867         return 0;
 868 }
 869
 870 static void nfs3_proc_write_setup(struct nfs_pgio_header *hdr,
 871                                   struct rpc_message *msg,
 872                                   struct rpc_clnt **clnt)
 873 {
 874         msg->rpc_proc = &nfs3_procedures[NFS3PROC_WRITE];
 875 }
 876
 877 static void nfs3_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
 878 {
 879         rpc_call_start(task);
 880 }
 881
 882 static int nfs3_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
 883 {
 884         if (data->commit_done_cb != NULL)
 885                 return data->commit_done_cb(task, data);
 886
 887         if (nfs3_async_handle_jukebox(task, data->inode))
 888                 return -EAGAIN;
 889         nfs_refresh_inode(data->inode, data->res.fattr);
 890         return 0;
 891 }
 892
 893 static void nfs3_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
 894                                    struct rpc_clnt **clnt)
 895 {
 896         msg->rpc_proc = &nfs3_procedures[NFS3PROC_COMMIT];
 897 }
 898
 899 static void nfs3_nlm_alloc_call(void *data)
 900 {
 901         struct nfs_lock_context *l_ctx = data;
 902         if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags)) {
 903                 get_nfs_open_context(l_ctx->open_context);
 904                 nfs_get_lock_context(l_ctx->open_context);
 905         }
 906 }
 907
 908 static bool nfs3_nlm_unlock_prepare(struct rpc_task *task, void *data)
 909 {
 910         struct nfs_lock_context *l_ctx = data;
 911         if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags))
 912                 return nfs_async_iocounter_wait(task, l_ctx);
 913         return false;
 914
 915 }
 916
 917 static void nfs3_nlm_release_call(void *data)
 918 {
 919         struct nfs_lock_context *l_ctx = data;
 920         struct nfs_open_context *ctx;
 921         if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags)) {
 922                 ctx = l_ctx->open_context;
 923                 nfs_put_lock_context(l_ctx);
 924                 put_nfs_open_context(ctx);
 925         }
 926 }
 927
 928 static const struct nlmclnt_operations nlmclnt_fl_close_lock_ops = {
 929         .nlmclnt_alloc_call = nfs3_nlm_alloc_call,
 930         .nlmclnt_unlock_prepare = nfs3_nlm_unlock_prepare,
 931         .nlmclnt_release_call = nfs3_nlm_release_call,
 932 };
 933
 934 static int
 935 nfs3_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
 936 {
 937         struct inode *inode = file_inode(filp);
 938         struct nfs_lock_context *l_ctx = NULL;
 939         struct nfs_open_context *ctx = nfs_file_open_context(filp);
 940         int status;
 941
 942         if (fl->fl_flags & FL_CLOSE) {
 943                 l_ctx = nfs_get_lock_context(ctx);
 944                 if (IS_ERR(l_ctx))
 945                         l_ctx = NULL;
 946                 else
 947                         set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
 948         }
 949
 950         status = nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl, l_ctx);
 951
 952         if (l_ctx)
 953                 nfs_put_lock_context(l_ctx);
 954
 955         return status;
 956 }
 957
 958 static int nfs3_have_delegation(struct inode *inode, fmode_t flags)
 959 {
 960         return 0;
 961 }
 962
 963 static const struct inode_operations nfs3_dir_inode_operations = {
 964         .create         = nfs_create,
 965         .lookup         = nfs_lookup,
 966         .link           = nfs_link,
 967         .unlink         = nfs_unlink,
 968         .symlink        = nfs_symlink,
 969         .mkdir          = nfs_mkdir,
 970         .rmdir          = nfs_rmdir,
 971         .mknod          = nfs_mknod,
 972         .rename         = nfs_rename,
 973         .permission     = nfs_permission,
 974         .getattr        = nfs_getattr,
 975         .setattr        = nfs_setattr,
 976 #ifdef CONFIG_NFS_V3_ACL
 977         .listxattr      = nfs3_listxattr,
 978         .get_acl        = nfs3_get_acl,
 979         .set_acl        = nfs3_set_acl,
 980 #endif
 981 };
 982
 983 static const struct inode_operations nfs3_file_inode_operations = {
 984         .permission     = nfs_permission,
 985         .getattr        = nfs_getattr,
 986         .setattr        = nfs_setattr,
 987 #ifdef CONFIG_NFS_V3_ACL
 988         .listxattr      = nfs3_listxattr,
 989         .get_acl        = nfs3_get_acl,
 990         .set_acl        = nfs3_set_acl,
 991 #endif
 992 };
 993
 994 const struct nfs_rpc_ops nfs_v3_clientops = {
 995         .version        = 3,                    /* protocol version */
 996         .dentry_ops     = &nfs_dentry_operations,
 997         .dir_inode_ops  = &nfs3_dir_inode_operations,
 998         .file_inode_ops = &nfs3_file_inode_operations,
 999         .file_ops       = &nfs_file_operations,
1000         .nlmclnt_ops    = &nlmclnt_fl_close_lock_ops,
1001         .getroot        = nfs3_proc_get_root,
1002         .submount       = nfs_submount,
1003         .try_get_tree   = nfs_try_get_tree,
1004         .getattr        = nfs3_proc_getattr,
1005         .setattr        = nfs3_proc_setattr,
1006         .lookup         = nfs3_proc_lookup,
1007         .access         = nfs3_proc_access,
1008         .readlink       = nfs3_proc_readlink,
1009         .create         = nfs3_proc_create,
1010         .remove         = nfs3_proc_remove,
1011         .unlink_setup   = nfs3_proc_unlink_setup,
1012         .unlink_rpc_prepare = nfs3_proc_unlink_rpc_prepare,
1013         .unlink_done    = nfs3_proc_unlink_done,
1014         .rename_setup   = nfs3_proc_rename_setup,
1015         .rename_rpc_prepare = nfs3_proc_rename_rpc_prepare,
1016         .rename_done    = nfs3_proc_rename_done,
1017         .link           = nfs3_proc_link,
1018         .symlink        = nfs3_proc_symlink,
1019         .mkdir          = nfs3_proc_mkdir,
1020         .rmdir          = nfs3_proc_rmdir,
1021         .readdir        = nfs3_proc_readdir,
1022         .mknod          = nfs3_proc_mknod,
1023         .statfs         = nfs3_proc_statfs,
1024         .fsinfo         = nfs3_proc_fsinfo,
1025         .pathconf       = nfs3_proc_pathconf,
1026         .decode_dirent  = nfs3_decode_dirent,
1027         .pgio_rpc_prepare = nfs3_proc_pgio_rpc_prepare,
1028         .read_setup     = nfs3_proc_read_setup,
1029         .read_done      = nfs3_read_done,
1030         .write_setup    = nfs3_proc_write_setup,
1031         .write_done     = nfs3_write_done,
1032         .commit_setup   = nfs3_proc_commit_setup,
1033         .commit_rpc_prepare = nfs3_proc_commit_rpc_prepare,
1034         .commit_done    = nfs3_commit_done,
1035         .lock           = nfs3_proc_lock,
1036         .clear_acl_cache = forget_all_cached_acls,
1037         .close_context  = nfs_close_context,
1038         .have_delegation = nfs3_have_delegation,
1039         .alloc_client   = nfs_alloc_client,
1040         .init_client    = nfs_init_client,
1041         .free_client    = nfs_free_client,
1042         .create_server  = nfs3_create_server,
1043         .clone_server   = nfs3_clone_server,
1044 };