fs/nfs/proc.c

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