root/fs/nfs/proc.c

DEFINITIONS

1. nfs_proc_get_root
2. nfs_proc_getattr
3. nfs_proc_setattr
4. nfs_proc_lookup
5. nfs_proc_readlink
6. nfs_alloc_createdata
7. nfs_free_createdata
8. nfs_proc_create
9. nfs_proc_mknod
10. nfs_proc_remove
11. nfs_proc_unlink_setup
12. nfs_proc_unlink_rpc_prepare
13. nfs_proc_unlink_done
14. nfs_proc_rename_setup
15. nfs_proc_rename_rpc_prepare
16. nfs_proc_rename_done
17. nfs_proc_link
18. nfs_proc_symlink
19. nfs_proc_mkdir
20. nfs_proc_rmdir
21. nfs_proc_readdir
22. nfs_proc_statfs
23. nfs_proc_fsinfo
24. nfs_proc_pathconf
25. nfs_read_done
26. nfs_proc_read_setup
27. nfs_proc_pgio_rpc_prepare
28. nfs_write_done
29. nfs_proc_write_setup
30. nfs_proc_commit_rpc_prepare
31. nfs_proc_commit_setup
32. nfs_proc_lock
33. nfs_lock_check_bounds
34. nfs_have_delegation

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  linux/fs/nfs/proc.c
   4  *
   5  *  Copyright (C) 1992, 1993, 1994  Rick Sladkey
   6  *
   7  *  OS-independent nfs remote procedure call functions
   8  *
   9  *  Tuned by Alan Cox <A.Cox@swansea.ac.uk> for >3K buffers
  10  *  so at last we can have decent(ish) throughput off a 
  11  *  Sun server.
  12  *
  13  *  Coding optimized and cleaned up by Florian La Roche.
  14  *  Note: Error returns are optimized for NFS_OK, which isn't translated via
  15  *  nfs_stat_to_errno(), but happens to be already the right return code.
  16  *
  17  *  Also, the code currently doesn't check the size of the packet, when
  18  *  it decodes the packet.
  19  *
  20  *  Feel free to fix it and mail me the diffs if it worries you.
  21  *
  22  *  Completely rewritten to support the new RPC call interface;
  23  *  rewrote and moved the entire XDR stuff to xdr.c
  24  *  --Olaf Kirch June 1996
  25  *
  26  *  The code below initializes all auto variables explicitly, otherwise
  27  *  it will fail to work as a module (gcc generates a memset call for an
  28  *  incomplete struct).
  29  */
  30 
  31 #include <linux/types.h>
  32 #include <linux/param.h>
  33 #include <linux/time.h>
  34 #include <linux/mm.h>
  35 #include <linux/errno.h>
  36 #include <linux/string.h>
  37 #include <linux/in.h>
  38 #include <linux/pagemap.h>
  39 #include <linux/sunrpc/clnt.h>
  40 #include <linux/nfs.h>
  41 #include <linux/nfs2.h>
  42 #include <linux/nfs_fs.h>
  43 #include <linux/nfs_page.h>
  44 #include <linux/lockd/bind.h>
  45 #include <linux/freezer.h>
  46 #include "internal.h"
  47 
  48 #define NFSDBG_FACILITY         NFSDBG_PROC
  49 
  50 /*
  51  * Bare-bones access to getattr: this is for nfs_read_super.
  52  */
  53 static int
  54 nfs_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
  55                   struct nfs_fsinfo *info)
  56 {
  57         struct nfs_fattr *fattr = info->fattr;
  58         struct nfs2_fsstat fsinfo;
  59         struct rpc_message msg = {
  60                 .rpc_proc       = &nfs_procedures[NFSPROC_GETATTR],
  61                 .rpc_argp       = fhandle,
  62                 .rpc_resp       = fattr,
  63         };
  64         int status;
  65 
  66         dprintk("%s: call getattr\n", __func__);
  67         nfs_fattr_init(fattr);
  68         status = rpc_call_sync(server->client, &msg, 0);
  69         /* Retry with default authentication if different */
  70         if (status && server->nfs_client->cl_rpcclient != server->client)
  71                 status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
  72         dprintk("%s: reply getattr: %d\n", __func__, status);
  73         if (status)
  74                 return status;
  75         dprintk("%s: call statfs\n", __func__);
  76         msg.rpc_proc = &nfs_procedures[NFSPROC_STATFS];
  77         msg.rpc_resp = &fsinfo;
  78         status = rpc_call_sync(server->client, &msg, 0);
  79         /* Retry with default authentication if different */
  80         if (status && server->nfs_client->cl_rpcclient != server->client)
  81                 status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
  82         dprintk("%s: reply statfs: %d\n", __func__, status);
  83         if (status)
  84                 return status;
  85         info->rtmax  = NFS_MAXDATA;
  86         info->rtpref = fsinfo.tsize;
  87         info->rtmult = fsinfo.bsize;
  88         info->wtmax  = NFS_MAXDATA;
  89         info->wtpref = fsinfo.tsize;
  90         info->wtmult = fsinfo.bsize;
  91         info->dtpref = fsinfo.tsize;
  92         info->maxfilesize = 0x7FFFFFFF;
  93         info->lease_time = 0;
  94         return 0;
  95 }
  96 
  97 /*
  98  * One function for each procedure in the NFS protocol.
  99  */
 100 static int
 101 nfs_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
 102                 struct nfs_fattr *fattr, struct nfs4_label *label,
 103                 struct inode *inode)
 104 {
 105         struct rpc_message msg = {
 106                 .rpc_proc       = &nfs_procedures[NFSPROC_GETATTR],
 107                 .rpc_argp       = fhandle,
 108                 .rpc_resp       = fattr,
 109         };
 110         int     status;
 111 
 112         dprintk("NFS call  getattr\n");
 113         nfs_fattr_init(fattr);
 114         status = rpc_call_sync(server->client, &msg, 0);
 115         dprintk("NFS reply getattr: %d\n", status);
 116         return status;
 117 }
 118 
 119 static int
 120 nfs_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
 121                  struct iattr *sattr)
 122 {
 123         struct inode *inode = d_inode(dentry);
 124         struct nfs_sattrargs    arg = { 
 125                 .fh     = NFS_FH(inode),
 126                 .sattr  = sattr
 127         };
 128         struct rpc_message msg = {
 129                 .rpc_proc       = &nfs_procedures[NFSPROC_SETATTR],
 130                 .rpc_argp       = &arg,
 131                 .rpc_resp       = fattr,
 132         };
 133         int     status;
 134 
 135         /* Mask out the non-modebit related stuff from attr->ia_mode */
 136         sattr->ia_mode &= S_IALLUGO;
 137 
 138         dprintk("NFS call  setattr\n");
 139         if (sattr->ia_valid & ATTR_FILE)
 140                 msg.rpc_cred = nfs_file_cred(sattr->ia_file);
 141         nfs_fattr_init(fattr);
 142         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 143         if (status == 0)
 144                 nfs_setattr_update_inode(inode, sattr, fattr);
 145         dprintk("NFS reply setattr: %d\n", status);
 146         return status;
 147 }
 148 
 149 static int
 150 nfs_proc_lookup(struct inode *dir, const struct qstr *name,
 151                 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
 152                 struct nfs4_label *label)
 153 {
 154         struct nfs_diropargs    arg = {
 155                 .fh             = NFS_FH(dir),
 156                 .name           = name->name,
 157                 .len            = name->len
 158         };
 159         struct nfs_diropok      res = {
 160                 .fh             = fhandle,
 161                 .fattr          = fattr
 162         };
 163         struct rpc_message msg = {
 164                 .rpc_proc       = &nfs_procedures[NFSPROC_LOOKUP],
 165                 .rpc_argp       = &arg,
 166                 .rpc_resp       = &res,
 167         };
 168         int                     status;
 169 
 170         dprintk("NFS call  lookup %s\n", name->name);
 171         nfs_fattr_init(fattr);
 172         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 173         dprintk("NFS reply lookup: %d\n", status);
 174         return status;
 175 }
 176 
 177 static int nfs_proc_readlink(struct inode *inode, struct page *page,
 178                 unsigned int pgbase, unsigned int pglen)
 179 {
 180         struct nfs_readlinkargs args = {
 181                 .fh             = NFS_FH(inode),
 182                 .pgbase         = pgbase,
 183                 .pglen          = pglen,
 184                 .pages          = &page
 185         };
 186         struct rpc_message msg = {
 187                 .rpc_proc       = &nfs_procedures[NFSPROC_READLINK],
 188                 .rpc_argp       = &args,
 189         };
 190         int                     status;
 191 
 192         dprintk("NFS call  readlink\n");
 193         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 194         dprintk("NFS reply readlink: %d\n", status);
 195         return status;
 196 }
 197 
 198 struct nfs_createdata {
 199         struct nfs_createargs arg;
 200         struct nfs_diropok res;
 201         struct nfs_fh fhandle;
 202         struct nfs_fattr fattr;
 203 };
 204 
 205 static struct nfs_createdata *nfs_alloc_createdata(struct inode *dir,
 206                 struct dentry *dentry, struct iattr *sattr)
 207 {
 208         struct nfs_createdata *data;
 209 
 210         data = kmalloc(sizeof(*data), GFP_KERNEL);
 211 
 212         if (data != NULL) {
 213                 data->arg.fh = NFS_FH(dir);
 214                 data->arg.name = dentry->d_name.name;
 215                 data->arg.len = dentry->d_name.len;
 216                 data->arg.sattr = sattr;
 217                 nfs_fattr_init(&data->fattr);
 218                 data->fhandle.size = 0;
 219                 data->res.fh = &data->fhandle;
 220                 data->res.fattr = &data->fattr;
 221         }
 222         return data;
 223 };
 224 
 225 static void nfs_free_createdata(const struct nfs_createdata *data)
 226 {
 227         kfree(data);
 228 }
 229 
 230 static int
 231 nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
 232                 int flags)
 233 {
 234         struct nfs_createdata *data;
 235         struct rpc_message msg = {
 236                 .rpc_proc       = &nfs_procedures[NFSPROC_CREATE],
 237         };
 238         int status = -ENOMEM;
 239 
 240         dprintk("NFS call  create %pd\n", dentry);
 241         data = nfs_alloc_createdata(dir, dentry, sattr);
 242         if (data == NULL)
 243                 goto out;
 244         msg.rpc_argp = &data->arg;
 245         msg.rpc_resp = &data->res;
 246         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 247         nfs_mark_for_revalidate(dir);
 248         if (status == 0)
 249                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, NULL);
 250         nfs_free_createdata(data);
 251 out:
 252         dprintk("NFS reply create: %d\n", status);
 253         return status;
 254 }
 255 
 256 /*
 257  * In NFSv2, mknod is grafted onto the create call.
 258  */
 259 static int
 260 nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
 261                dev_t rdev)
 262 {
 263         struct nfs_createdata *data;
 264         struct rpc_message msg = {
 265                 .rpc_proc       = &nfs_procedures[NFSPROC_CREATE],
 266         };
 267         umode_t mode;
 268         int status = -ENOMEM;
 269 
 270         dprintk("NFS call  mknod %pd\n", dentry);
 271 
 272         mode = sattr->ia_mode;
 273         if (S_ISFIFO(mode)) {
 274                 sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR;
 275                 sattr->ia_valid &= ~ATTR_SIZE;
 276         } else if (S_ISCHR(mode) || S_ISBLK(mode)) {
 277                 sattr->ia_valid |= ATTR_SIZE;
 278                 sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */
 279         }
 280 
 281         data = nfs_alloc_createdata(dir, dentry, sattr);
 282         if (data == NULL)
 283                 goto out;
 284         msg.rpc_argp = &data->arg;
 285         msg.rpc_resp = &data->res;
 286 
 287         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 288         nfs_mark_for_revalidate(dir);
 289 
 290         if (status == -EINVAL && S_ISFIFO(mode)) {
 291                 sattr->ia_mode = mode;
 292                 nfs_fattr_init(data->res.fattr);
 293                 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 294         }
 295         if (status == 0)
 296                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, NULL);
 297         nfs_free_createdata(data);
 298 out:
 299         dprintk("NFS reply mknod: %d\n", status);
 300         return status;
 301 }
 302   
 303 static int
 304 nfs_proc_remove(struct inode *dir, struct dentry *dentry)
 305 {
 306         struct nfs_removeargs arg = {
 307                 .fh = NFS_FH(dir),
 308                 .name = dentry->d_name,
 309         };
 310         struct rpc_message msg = { 
 311                 .rpc_proc = &nfs_procedures[NFSPROC_REMOVE],
 312                 .rpc_argp = &arg,
 313         };
 314         int                     status;
 315 
 316         dprintk("NFS call  remove %pd2\n",dentry);
 317         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 318         nfs_mark_for_revalidate(dir);
 319 
 320         dprintk("NFS reply remove: %d\n", status);
 321         return status;
 322 }
 323 
 324 static void
 325 nfs_proc_unlink_setup(struct rpc_message *msg,
 326                 struct dentry *dentry,
 327                 struct inode *inode)
 328 {
 329         msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE];
 330 }
 331 
 332 static void nfs_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
 333 {
 334         rpc_call_start(task);
 335 }
 336 
 337 static int nfs_proc_unlink_done(struct rpc_task *task, struct inode *dir)
 338 {
 339         nfs_mark_for_revalidate(dir);
 340         return 1;
 341 }
 342 
 343 static void
 344 nfs_proc_rename_setup(struct rpc_message *msg,
 345                 struct dentry *old_dentry,
 346                 struct dentry *new_dentry)
 347 {
 348         msg->rpc_proc = &nfs_procedures[NFSPROC_RENAME];
 349 }
 350 
 351 static void nfs_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
 352 {
 353         rpc_call_start(task);
 354 }
 355 
 356 static int
 357 nfs_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
 358                      struct inode *new_dir)
 359 {
 360         nfs_mark_for_revalidate(old_dir);
 361         nfs_mark_for_revalidate(new_dir);
 362         return 1;
 363 }
 364 
 365 static int
 366 nfs_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
 367 {
 368         struct nfs_linkargs     arg = {
 369                 .fromfh         = NFS_FH(inode),
 370                 .tofh           = NFS_FH(dir),
 371                 .toname         = name->name,
 372                 .tolen          = name->len
 373         };
 374         struct rpc_message msg = {
 375                 .rpc_proc       = &nfs_procedures[NFSPROC_LINK],
 376                 .rpc_argp       = &arg,
 377         };
 378         int                     status;
 379 
 380         dprintk("NFS call  link %s\n", name->name);
 381         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 382         nfs_mark_for_revalidate(inode);
 383         nfs_mark_for_revalidate(dir);
 384         dprintk("NFS reply link: %d\n", status);
 385         return status;
 386 }
 387 
 388 static int
 389 nfs_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
 390                  unsigned int len, struct iattr *sattr)
 391 {
 392         struct nfs_fh *fh;
 393         struct nfs_fattr *fattr;
 394         struct nfs_symlinkargs  arg = {
 395                 .fromfh         = NFS_FH(dir),
 396                 .fromname       = dentry->d_name.name,
 397                 .fromlen        = dentry->d_name.len,
 398                 .pages          = &page,
 399                 .pathlen        = len,
 400                 .sattr          = sattr
 401         };
 402         struct rpc_message msg = {
 403                 .rpc_proc       = &nfs_procedures[NFSPROC_SYMLINK],
 404                 .rpc_argp       = &arg,
 405         };
 406         int status = -ENAMETOOLONG;
 407 
 408         dprintk("NFS call  symlink %pd\n", dentry);
 409 
 410         if (len > NFS2_MAXPATHLEN)
 411                 goto out;
 412 
 413         fh = nfs_alloc_fhandle();
 414         fattr = nfs_alloc_fattr();
 415         status = -ENOMEM;
 416         if (fh == NULL || fattr == NULL)
 417                 goto out_free;
 418 
 419         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 420         nfs_mark_for_revalidate(dir);
 421 
 422         /*
 423          * V2 SYMLINK requests don't return any attributes.  Setting the
 424          * filehandle size to zero indicates to nfs_instantiate that it
 425          * should fill in the data with a LOOKUP call on the wire.
 426          */
 427         if (status == 0)
 428                 status = nfs_instantiate(dentry, fh, fattr, NULL);
 429 
 430 out_free:
 431         nfs_free_fattr(fattr);
 432         nfs_free_fhandle(fh);
 433 out:
 434         dprintk("NFS reply symlink: %d\n", status);
 435         return status;
 436 }
 437 
 438 static int
 439 nfs_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
 440 {
 441         struct nfs_createdata *data;
 442         struct rpc_message msg = {
 443                 .rpc_proc       = &nfs_procedures[NFSPROC_MKDIR],
 444         };
 445         int status = -ENOMEM;
 446 
 447         dprintk("NFS call  mkdir %pd\n", dentry);
 448         data = nfs_alloc_createdata(dir, dentry, sattr);
 449         if (data == NULL)
 450                 goto out;
 451         msg.rpc_argp = &data->arg;
 452         msg.rpc_resp = &data->res;
 453 
 454         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 455         nfs_mark_for_revalidate(dir);
 456         if (status == 0)
 457                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, NULL);
 458         nfs_free_createdata(data);
 459 out:
 460         dprintk("NFS reply mkdir: %d\n", status);
 461         return status;
 462 }
 463 
 464 static int
 465 nfs_proc_rmdir(struct inode *dir, const struct qstr *name)
 466 {
 467         struct nfs_diropargs    arg = {
 468                 .fh             = NFS_FH(dir),
 469                 .name           = name->name,
 470                 .len            = name->len
 471         };
 472         struct rpc_message msg = {
 473                 .rpc_proc       = &nfs_procedures[NFSPROC_RMDIR],
 474                 .rpc_argp       = &arg,
 475         };
 476         int                     status;
 477 
 478         dprintk("NFS call  rmdir %s\n", name->name);
 479         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 480         nfs_mark_for_revalidate(dir);
 481         dprintk("NFS reply rmdir: %d\n", status);
 482         return status;
 483 }
 484 
 485 /*
 486  * The READDIR implementation is somewhat hackish - we pass a temporary
 487  * buffer to the encode function, which installs it in the receive
 488  * the receive iovec. The decode function just parses the reply to make
 489  * sure it is syntactically correct; the entries itself are decoded
 490  * from nfs_readdir by calling the decode_entry function directly.
 491  */
 492 static int
 493 nfs_proc_readdir(struct dentry *dentry, const struct cred *cred,
 494                  u64 cookie, struct page **pages, unsigned int count, bool plus)
 495 {
 496         struct inode            *dir = d_inode(dentry);
 497         struct nfs_readdirargs  arg = {
 498                 .fh             = NFS_FH(dir),
 499                 .cookie         = cookie,
 500                 .count          = count,
 501                 .pages          = pages,
 502         };
 503         struct rpc_message      msg = {
 504                 .rpc_proc       = &nfs_procedures[NFSPROC_READDIR],
 505                 .rpc_argp       = &arg,
 506                 .rpc_cred       = cred,
 507         };
 508         int                     status;
 509 
 510         dprintk("NFS call  readdir %d\n", (unsigned int)cookie);
 511         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 512 
 513         nfs_invalidate_atime(dir);
 514 
 515         dprintk("NFS reply readdir: %d\n", status);
 516         return status;
 517 }
 518 
 519 static int
 520 nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
 521                         struct nfs_fsstat *stat)
 522 {
 523         struct nfs2_fsstat fsinfo;
 524         struct rpc_message msg = {
 525                 .rpc_proc       = &nfs_procedures[NFSPROC_STATFS],
 526                 .rpc_argp       = fhandle,
 527                 .rpc_resp       = &fsinfo,
 528         };
 529         int     status;
 530 
 531         dprintk("NFS call  statfs\n");
 532         nfs_fattr_init(stat->fattr);
 533         status = rpc_call_sync(server->client, &msg, 0);
 534         dprintk("NFS reply statfs: %d\n", status);
 535         if (status)
 536                 goto out;
 537         stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize;
 538         stat->fbytes = (u64)fsinfo.bfree  * fsinfo.bsize;
 539         stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize;
 540         stat->tfiles = 0;
 541         stat->ffiles = 0;
 542         stat->afiles = 0;
 543 out:
 544         return status;
 545 }
 546 
 547 static int
 548 nfs_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
 549                         struct nfs_fsinfo *info)
 550 {
 551         struct nfs2_fsstat fsinfo;
 552         struct rpc_message msg = {
 553                 .rpc_proc       = &nfs_procedures[NFSPROC_STATFS],
 554                 .rpc_argp       = fhandle,
 555                 .rpc_resp       = &fsinfo,
 556         };
 557         int     status;
 558 
 559         dprintk("NFS call  fsinfo\n");
 560         nfs_fattr_init(info->fattr);
 561         status = rpc_call_sync(server->client, &msg, 0);
 562         dprintk("NFS reply fsinfo: %d\n", status);
 563         if (status)
 564                 goto out;
 565         info->rtmax  = NFS_MAXDATA;
 566         info->rtpref = fsinfo.tsize;
 567         info->rtmult = fsinfo.bsize;
 568         info->wtmax  = NFS_MAXDATA;
 569         info->wtpref = fsinfo.tsize;
 570         info->wtmult = fsinfo.bsize;
 571         info->dtpref = fsinfo.tsize;
 572         info->maxfilesize = 0x7FFFFFFF;
 573         info->lease_time = 0;
 574 out:
 575         return status;
 576 }
 577 
 578 static int
 579 nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
 580                   struct nfs_pathconf *info)
 581 {
 582         info->max_link = 0;
 583         info->max_namelen = NFS2_MAXNAMLEN;
 584         return 0;
 585 }
 586 
 587 static int nfs_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
 588 {
 589         struct inode *inode = hdr->inode;
 590 
 591         nfs_invalidate_atime(inode);
 592         if (task->tk_status >= 0) {
 593                 nfs_refresh_inode(inode, hdr->res.fattr);
 594                 /* Emulate the eof flag, which isn't normally needed in NFSv2
 595                  * as it is guaranteed to always return the file attributes
 596                  */
 597                 if ((hdr->res.count == 0 && hdr->args.count > 0) ||
 598                     hdr->args.offset + hdr->res.count >= hdr->res.fattr->size)
 599                         hdr->res.eof = 1;
 600         }
 601         return 0;
 602 }
 603 
 604 static void nfs_proc_read_setup(struct nfs_pgio_header *hdr,
 605                                 struct rpc_message *msg)
 606 {
 607         msg->rpc_proc = &nfs_procedures[NFSPROC_READ];
 608 }
 609 
 610 static int nfs_proc_pgio_rpc_prepare(struct rpc_task *task,
 611                                      struct nfs_pgio_header *hdr)
 612 {
 613         rpc_call_start(task);
 614         return 0;
 615 }
 616 
 617 static int nfs_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
 618 {
 619         if (task->tk_status >= 0) {
 620                 hdr->res.count = hdr->args.count;
 621                 nfs_writeback_update_inode(hdr);
 622         }
 623         return 0;
 624 }
 625 
 626 static void nfs_proc_write_setup(struct nfs_pgio_header *hdr,
 627                                  struct rpc_message *msg,
 628                                  struct rpc_clnt **clnt)
 629 {
 630         /* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */
 631         hdr->args.stable = NFS_FILE_SYNC;
 632         msg->rpc_proc = &nfs_procedures[NFSPROC_WRITE];
 633 }
 634 
 635 static void nfs_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
 636 {
 637         BUG();
 638 }
 639 
 640 static void
 641 nfs_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
 642                         struct rpc_clnt **clnt)
 643 {
 644         BUG();
 645 }
 646 
 647 static int
 648 nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
 649 {
 650         struct inode *inode = file_inode(filp);
 651 
 652         return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl, NULL);
 653 }
 654 
 655 /* Helper functions for NFS lock bounds checking */
 656 #define NFS_LOCK32_OFFSET_MAX ((__s32)0x7fffffffUL)
 657 static int nfs_lock_check_bounds(const struct file_lock *fl)
 658 {
 659         __s32 start, end;
 660 
 661         start = (__s32)fl->fl_start;
 662         if ((loff_t)start != fl->fl_start)
 663                 goto out_einval;
 664 
 665         if (fl->fl_end != OFFSET_MAX) {
 666                 end = (__s32)fl->fl_end;
 667                 if ((loff_t)end != fl->fl_end)
 668                         goto out_einval;
 669         } else
 670                 end = NFS_LOCK32_OFFSET_MAX;
 671 
 672         if (start < 0 || start > end)
 673                 goto out_einval;
 674         return 0;
 675 out_einval:
 676         return -EINVAL;
 677 }
 678 
 679 static int nfs_have_delegation(struct inode *inode, fmode_t flags)
 680 {
 681         return 0;
 682 }
 683 
 684 static const struct inode_operations nfs_dir_inode_operations = {
 685         .create         = nfs_create,
 686         .lookup         = nfs_lookup,
 687         .link           = nfs_link,
 688         .unlink         = nfs_unlink,
 689         .symlink        = nfs_symlink,
 690         .mkdir          = nfs_mkdir,
 691         .rmdir          = nfs_rmdir,
 692         .mknod          = nfs_mknod,
 693         .rename         = nfs_rename,
 694         .permission     = nfs_permission,
 695         .getattr        = nfs_getattr,
 696         .setattr        = nfs_setattr,
 697 };
 698 
 699 static const struct inode_operations nfs_file_inode_operations = {
 700         .permission     = nfs_permission,
 701         .getattr        = nfs_getattr,
 702         .setattr        = nfs_setattr,
 703 };
 704 
 705 const struct nfs_rpc_ops nfs_v2_clientops = {
 706         .version        = 2,                   /* protocol version */
 707         .dentry_ops     = &nfs_dentry_operations,
 708         .dir_inode_ops  = &nfs_dir_inode_operations,
 709         .file_inode_ops = &nfs_file_inode_operations,
 710         .file_ops       = &nfs_file_operations,
 711         .getroot        = nfs_proc_get_root,
 712         .submount       = nfs_submount,
 713         .try_mount      = nfs_try_mount,
 714         .getattr        = nfs_proc_getattr,
 715         .setattr        = nfs_proc_setattr,
 716         .lookup         = nfs_proc_lookup,
 717         .access         = NULL,                /* access */
 718         .readlink       = nfs_proc_readlink,
 719         .create         = nfs_proc_create,
 720         .remove         = nfs_proc_remove,
 721         .unlink_setup   = nfs_proc_unlink_setup,
 722         .unlink_rpc_prepare = nfs_proc_unlink_rpc_prepare,
 723         .unlink_done    = nfs_proc_unlink_done,
 724         .rename_setup   = nfs_proc_rename_setup,
 725         .rename_rpc_prepare = nfs_proc_rename_rpc_prepare,
 726         .rename_done    = nfs_proc_rename_done,
 727         .link           = nfs_proc_link,
 728         .symlink        = nfs_proc_symlink,
 729         .mkdir          = nfs_proc_mkdir,
 730         .rmdir          = nfs_proc_rmdir,
 731         .readdir        = nfs_proc_readdir,
 732         .mknod          = nfs_proc_mknod,
 733         .statfs         = nfs_proc_statfs,
 734         .fsinfo         = nfs_proc_fsinfo,
 735         .pathconf       = nfs_proc_pathconf,
 736         .decode_dirent  = nfs2_decode_dirent,
 737         .pgio_rpc_prepare = nfs_proc_pgio_rpc_prepare,
 738         .read_setup     = nfs_proc_read_setup,
 739         .read_done      = nfs_read_done,
 740         .write_setup    = nfs_proc_write_setup,
 741         .write_done     = nfs_write_done,
 742         .commit_setup   = nfs_proc_commit_setup,
 743         .commit_rpc_prepare = nfs_proc_commit_rpc_prepare,
 744         .lock           = nfs_proc_lock,
 745         .lock_check_bounds = nfs_lock_check_bounds,
 746         .close_context  = nfs_close_context,
 747         .have_delegation = nfs_have_delegation,
 748         .alloc_client   = nfs_alloc_client,
 749         .init_client    = nfs_init_client,
 750         .free_client    = nfs_free_client,
 751         .create_server  = nfs_create_server,
 752         .clone_server   = nfs_clone_server,
 753 };