linux/fs/nfs/proc.c
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   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 */
  52static int
  53nfs_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 */
  99static int
 100nfs_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
 101                struct nfs_fattr *fattr)
 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
 117static int
 118nfs_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
 119                 struct iattr *sattr)
 120{
 121        struct inode *inode = dentry->d_inode;
 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);
 143        dprintk("NFS reply setattr: %d\n", status);
 144        return status;
 145}
 146
 147static int
 148nfs_proc_lookup(struct inode *dir, struct qstr *name,
 149                struct nfs_fh *fhandle, struct nfs_fattr *fattr)
 150{
 151        struct nfs_diropargs    arg = {
 152                .fh             = NFS_FH(dir),
 153                .name           = name->name,
 154                .len            = name->len
 155        };
 156        struct nfs_diropok      res = {
 157                .fh             = fhandle,
 158                .fattr          = fattr
 159        };
 160        struct rpc_message msg = {
 161                .rpc_proc       = &nfs_procedures[NFSPROC_LOOKUP],
 162                .rpc_argp       = &arg,
 163                .rpc_resp       = &res,
 164        };
 165        int                     status;
 166
 167        dprintk("NFS call  lookup %s\n", name->name);
 168        nfs_fattr_init(fattr);
 169        status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 170        dprintk("NFS reply lookup: %d\n", status);
 171        return status;
 172}
 173
 174static int nfs_proc_readlink(struct inode *inode, struct page *page,
 175                unsigned int pgbase, unsigned int pglen)
 176{
 177        struct nfs_readlinkargs args = {
 178                .fh             = NFS_FH(inode),
 179                .pgbase         = pgbase,
 180                .pglen          = pglen,
 181                .pages          = &page
 182        };
 183        struct rpc_message msg = {
 184                .rpc_proc       = &nfs_procedures[NFSPROC_READLINK],
 185                .rpc_argp       = &args,
 186        };
 187        int                     status;
 188
 189        dprintk("NFS call  readlink\n");
 190        status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 191        dprintk("NFS reply readlink: %d\n", status);
 192        return status;
 193}
 194
 195struct nfs_createdata {
 196        struct nfs_createargs arg;
 197        struct nfs_diropok res;
 198        struct nfs_fh fhandle;
 199        struct nfs_fattr fattr;
 200};
 201
 202static struct nfs_createdata *nfs_alloc_createdata(struct inode *dir,
 203                struct dentry *dentry, struct iattr *sattr)
 204{
 205        struct nfs_createdata *data;
 206
 207        data = kmalloc(sizeof(*data), GFP_KERNEL);
 208
 209        if (data != NULL) {
 210                data->arg.fh = NFS_FH(dir);
 211                data->arg.name = dentry->d_name.name;
 212                data->arg.len = dentry->d_name.len;
 213                data->arg.sattr = sattr;
 214                nfs_fattr_init(&data->fattr);
 215                data->fhandle.size = 0;
 216                data->res.fh = &data->fhandle;
 217                data->res.fattr = &data->fattr;
 218        }
 219        return data;
 220};
 221
 222static void nfs_free_createdata(const struct nfs_createdata *data)
 223{
 224        kfree(data);
 225}
 226
 227static int
 228nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
 229                int flags)
 230{
 231        struct nfs_createdata *data;
 232        struct rpc_message msg = {
 233                .rpc_proc       = &nfs_procedures[NFSPROC_CREATE],
 234        };
 235        int status = -ENOMEM;
 236
 237        dprintk("NFS call  create %s\n", dentry->d_name.name);
 238        data = nfs_alloc_createdata(dir, dentry, sattr);
 239        if (data == NULL)
 240                goto out;
 241        msg.rpc_argp = &data->arg;
 242        msg.rpc_resp = &data->res;
 243        status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 244        nfs_mark_for_revalidate(dir);
 245        if (status == 0)
 246                status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
 247        nfs_free_createdata(data);
 248out:
 249        dprintk("NFS reply create: %d\n", status);
 250        return status;
 251}
 252
 253/*
 254 * In NFSv2, mknod is grafted onto the create call.
 255 */
 256static int
 257nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
 258               dev_t rdev)
 259{
 260        struct nfs_createdata *data;
 261        struct rpc_message msg = {
 262                .rpc_proc       = &nfs_procedures[NFSPROC_CREATE],
 263        };
 264        umode_t mode;
 265        int status = -ENOMEM;
 266
 267        dprintk("NFS call  mknod %s\n", dentry->d_name.name);
 268
 269        mode = sattr->ia_mode;
 270        if (S_ISFIFO(mode)) {
 271                sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR;
 272                sattr->ia_valid &= ~ATTR_SIZE;
 273        } else if (S_ISCHR(mode) || S_ISBLK(mode)) {
 274                sattr->ia_valid |= ATTR_SIZE;
 275                sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */
 276        }
 277
 278        data = nfs_alloc_createdata(dir, dentry, sattr);
 279        if (data == NULL)
 280                goto out;
 281        msg.rpc_argp = &data->arg;
 282        msg.rpc_resp = &data->res;
 283
 284        status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 285        nfs_mark_for_revalidate(dir);
 286
 287        if (status == -EINVAL && S_ISFIFO(mode)) {
 288                sattr->ia_mode = mode;
 289                nfs_fattr_init(data->res.fattr);
 290                status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 291        }
 292        if (status == 0)
 293                status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
 294        nfs_free_createdata(data);
 295out:
 296        dprintk("NFS reply mknod: %d\n", status);
 297        return status;
 298}
 299  
 300static int
 301nfs_proc_remove(struct inode *dir, struct qstr *name)
 302{
 303        struct nfs_removeargs arg = {
 304                .fh = NFS_FH(dir),
 305                .name = *name,
 306        };
 307        struct rpc_message msg = { 
 308                .rpc_proc = &nfs_procedures[NFSPROC_REMOVE],
 309                .rpc_argp = &arg,
 310        };
 311        int                     status;
 312
 313        dprintk("NFS call  remove %s\n", name->name);
 314        status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 315        nfs_mark_for_revalidate(dir);
 316
 317        dprintk("NFS reply remove: %d\n", status);
 318        return status;
 319}
 320
 321static void
 322nfs_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
 323{
 324        msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE];
 325}
 326
 327static void nfs_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
 328{
 329        rpc_call_start(task);
 330}
 331
 332static int nfs_proc_unlink_done(struct rpc_task *task, struct inode *dir)
 333{
 334        nfs_mark_for_revalidate(dir);
 335        return 1;
 336}
 337
 338static void
 339nfs_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
 340{
 341        msg->rpc_proc = &nfs_procedures[NFSPROC_RENAME];
 342}
 343
 344static void nfs_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
 345{
 346        rpc_call_start(task);
 347}
 348
 349static int
 350nfs_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
 351                     struct inode *new_dir)
 352{
 353        nfs_mark_for_revalidate(old_dir);
 354        nfs_mark_for_revalidate(new_dir);
 355        return 1;
 356}
 357
 358static int
 359nfs_proc_rename(struct inode *old_dir, struct qstr *old_name,
 360                struct inode *new_dir, struct qstr *new_name)
 361{
 362        struct nfs_renameargs   arg = {
 363                .old_dir        = NFS_FH(old_dir),
 364                .old_name       = old_name,
 365                .new_dir        = NFS_FH(new_dir),
 366                .new_name       = new_name,
 367        };
 368        struct rpc_message msg = {
 369                .rpc_proc       = &nfs_procedures[NFSPROC_RENAME],
 370                .rpc_argp       = &arg,
 371        };
 372        int                     status;
 373
 374        dprintk("NFS call  rename %s -> %s\n", old_name->name, new_name->name);
 375        status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
 376        nfs_mark_for_revalidate(old_dir);
 377        nfs_mark_for_revalidate(new_dir);
 378        dprintk("NFS reply rename: %d\n", status);
 379        return status;
 380}
 381
 382static int
 383nfs_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
 384{
 385        struct nfs_linkargs     arg = {
 386                .fromfh         = NFS_FH(inode),
 387                .tofh           = NFS_FH(dir),
 388                .toname         = name->name,
 389                .tolen          = name->len
 390        };
 391        struct rpc_message msg = {
 392                .rpc_proc       = &nfs_procedures[NFSPROC_LINK],
 393                .rpc_argp       = &arg,
 394        };
 395        int                     status;
 396
 397        dprintk("NFS call  link %s\n", name->name);
 398        status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 399        nfs_mark_for_revalidate(inode);
 400        nfs_mark_for_revalidate(dir);
 401        dprintk("NFS reply link: %d\n", status);
 402        return status;
 403}
 404
 405static int
 406nfs_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
 407                 unsigned int len, struct iattr *sattr)
 408{
 409        struct nfs_fh *fh;
 410        struct nfs_fattr *fattr;
 411        struct nfs_symlinkargs  arg = {
 412                .fromfh         = NFS_FH(dir),
 413                .fromname       = dentry->d_name.name,
 414                .fromlen        = dentry->d_name.len,
 415                .pages          = &page,
 416                .pathlen        = len,
 417                .sattr          = sattr
 418        };
 419        struct rpc_message msg = {
 420                .rpc_proc       = &nfs_procedures[NFSPROC_SYMLINK],
 421                .rpc_argp       = &arg,
 422        };
 423        int status = -ENAMETOOLONG;
 424
 425        dprintk("NFS call  symlink %s\n", dentry->d_name.name);
 426
 427        if (len > NFS2_MAXPATHLEN)
 428                goto out;
 429
 430        fh = nfs_alloc_fhandle();
 431        fattr = nfs_alloc_fattr();
 432        status = -ENOMEM;
 433        if (fh == NULL || fattr == NULL)
 434                goto out_free;
 435
 436        status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 437        nfs_mark_for_revalidate(dir);
 438
 439        /*
 440         * V2 SYMLINK requests don't return any attributes.  Setting the
 441         * filehandle size to zero indicates to nfs_instantiate that it
 442         * should fill in the data with a LOOKUP call on the wire.
 443         */
 444        if (status == 0)
 445                status = nfs_instantiate(dentry, fh, fattr);
 446
 447out_free:
 448        nfs_free_fattr(fattr);
 449        nfs_free_fhandle(fh);
 450out:
 451        dprintk("NFS reply symlink: %d\n", status);
 452        return status;
 453}
 454
 455static int
 456nfs_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
 457{
 458        struct nfs_createdata *data;
 459        struct rpc_message msg = {
 460                .rpc_proc       = &nfs_procedures[NFSPROC_MKDIR],
 461        };
 462        int status = -ENOMEM;
 463
 464        dprintk("NFS call  mkdir %s\n", dentry->d_name.name);
 465        data = nfs_alloc_createdata(dir, dentry, sattr);
 466        if (data == NULL)
 467                goto out;
 468        msg.rpc_argp = &data->arg;
 469        msg.rpc_resp = &data->res;
 470
 471        status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 472        nfs_mark_for_revalidate(dir);
 473        if (status == 0)
 474                status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
 475        nfs_free_createdata(data);
 476out:
 477        dprintk("NFS reply mkdir: %d\n", status);
 478        return status;
 479}
 480
 481static int
 482nfs_proc_rmdir(struct inode *dir, struct qstr *name)
 483{
 484        struct nfs_diropargs    arg = {
 485                .fh             = NFS_FH(dir),
 486                .name           = name->name,
 487                .len            = name->len
 488        };
 489        struct rpc_message msg = {
 490                .rpc_proc       = &nfs_procedures[NFSPROC_RMDIR],
 491                .rpc_argp       = &arg,
 492        };
 493        int                     status;
 494
 495        dprintk("NFS call  rmdir %s\n", name->name);
 496        status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 497        nfs_mark_for_revalidate(dir);
 498        dprintk("NFS reply rmdir: %d\n", status);
 499        return status;
 500}
 501
 502/*
 503 * The READDIR implementation is somewhat hackish - we pass a temporary
 504 * buffer to the encode function, which installs it in the receive
 505 * the receive iovec. The decode function just parses the reply to make
 506 * sure it is syntactically correct; the entries itself are decoded
 507 * from nfs_readdir by calling the decode_entry function directly.
 508 */
 509static int
 510nfs_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
 511                 u64 cookie, struct page **pages, unsigned int count, int plus)
 512{
 513        struct inode            *dir = dentry->d_inode;
 514        struct nfs_readdirargs  arg = {
 515                .fh             = NFS_FH(dir),
 516                .cookie         = cookie,
 517                .count          = count,
 518                .pages          = pages,
 519        };
 520        struct rpc_message      msg = {
 521                .rpc_proc       = &nfs_procedures[NFSPROC_READDIR],
 522                .rpc_argp       = &arg,
 523                .rpc_cred       = cred,
 524        };
 525        int                     status;
 526
 527        dprintk("NFS call  readdir %d\n", (unsigned int)cookie);
 528        status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 529
 530        nfs_invalidate_atime(dir);
 531
 532        dprintk("NFS reply readdir: %d\n", status);
 533        return status;
 534}
 535
 536static int
 537nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
 538                        struct nfs_fsstat *stat)
 539{
 540        struct nfs2_fsstat fsinfo;
 541        struct rpc_message msg = {
 542                .rpc_proc       = &nfs_procedures[NFSPROC_STATFS],
 543                .rpc_argp       = fhandle,
 544                .rpc_resp       = &fsinfo,
 545        };
 546        int     status;
 547
 548        dprintk("NFS call  statfs\n");
 549        nfs_fattr_init(stat->fattr);
 550        status = rpc_call_sync(server->client, &msg, 0);
 551        dprintk("NFS reply statfs: %d\n", status);
 552        if (status)
 553                goto out;
 554        stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize;
 555        stat->fbytes = (u64)fsinfo.bfree  * fsinfo.bsize;
 556        stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize;
 557        stat->tfiles = 0;
 558        stat->ffiles = 0;
 559        stat->afiles = 0;
 560out:
 561        return status;
 562}
 563
 564static int
 565nfs_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
 566                        struct nfs_fsinfo *info)
 567{
 568        struct nfs2_fsstat fsinfo;
 569        struct rpc_message msg = {
 570                .rpc_proc       = &nfs_procedures[NFSPROC_STATFS],
 571                .rpc_argp       = fhandle,
 572                .rpc_resp       = &fsinfo,
 573        };
 574        int     status;
 575
 576        dprintk("NFS call  fsinfo\n");
 577        nfs_fattr_init(info->fattr);
 578        status = rpc_call_sync(server->client, &msg, 0);
 579        dprintk("NFS reply fsinfo: %d\n", status);
 580        if (status)
 581                goto out;
 582        info->rtmax  = NFS_MAXDATA;
 583        info->rtpref = fsinfo.tsize;
 584        info->rtmult = fsinfo.bsize;
 585        info->wtmax  = NFS_MAXDATA;
 586        info->wtpref = fsinfo.tsize;
 587        info->wtmult = fsinfo.bsize;
 588        info->dtpref = fsinfo.tsize;
 589        info->maxfilesize = 0x7FFFFFFF;
 590        info->lease_time = 0;
 591out:
 592        return status;
 593}
 594
 595static int
 596nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
 597                  struct nfs_pathconf *info)
 598{
 599        info->max_link = 0;
 600        info->max_namelen = NFS2_MAXNAMLEN;
 601        return 0;
 602}
 603
 604static int nfs_read_done(struct rpc_task *task, struct nfs_read_data *data)
 605{
 606        struct inode *inode = data->header->inode;
 607
 608        nfs_invalidate_atime(inode);
 609        if (task->tk_status >= 0) {
 610                nfs_refresh_inode(inode, data->res.fattr);
 611                /* Emulate the eof flag, which isn't normally needed in NFSv2
 612                 * as it is guaranteed to always return the file attributes
 613                 */
 614                if (data->args.offset + data->res.count >= data->res.fattr->size)
 615                        data->res.eof = 1;
 616        }
 617        return 0;
 618}
 619
 620static void nfs_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
 621{
 622        msg->rpc_proc = &nfs_procedures[NFSPROC_READ];
 623}
 624
 625static void nfs_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
 626{
 627        rpc_call_start(task);
 628}
 629
 630static int nfs_write_done(struct rpc_task *task, struct nfs_write_data *data)
 631{
 632        struct inode *inode = data->header->inode;
 633
 634        if (task->tk_status >= 0)
 635                nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
 636        return 0;
 637}
 638
 639static void nfs_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
 640{
 641        /* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */
 642        data->args.stable = NFS_FILE_SYNC;
 643        msg->rpc_proc = &nfs_procedures[NFSPROC_WRITE];
 644}
 645
 646static void nfs_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
 647{
 648        rpc_call_start(task);
 649}
 650
 651static void nfs_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
 652{
 653        BUG();
 654}
 655
 656static void
 657nfs_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
 658{
 659        BUG();
 660}
 661
 662static int
 663nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
 664{
 665        struct inode *inode = filp->f_path.dentry->d_inode;
 666
 667        return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl);
 668}
 669
 670/* Helper functions for NFS lock bounds checking */
 671#define NFS_LOCK32_OFFSET_MAX ((__s32)0x7fffffffUL)
 672static int nfs_lock_check_bounds(const struct file_lock *fl)
 673{
 674        __s32 start, end;
 675
 676        start = (__s32)fl->fl_start;
 677        if ((loff_t)start != fl->fl_start)
 678                goto out_einval;
 679
 680        if (fl->fl_end != OFFSET_MAX) {
 681                end = (__s32)fl->fl_end;
 682                if ((loff_t)end != fl->fl_end)
 683                        goto out_einval;
 684        } else
 685                end = NFS_LOCK32_OFFSET_MAX;
 686
 687        if (start < 0 || start > end)
 688                goto out_einval;
 689        return 0;
 690out_einval:
 691        return -EINVAL;
 692}
 693
 694static int nfs_have_delegation(struct inode *inode, fmode_t flags)
 695{
 696        return 0;
 697}
 698
 699static int nfs_return_delegation(struct inode *inode)
 700{
 701        nfs_wb_all(inode);
 702        return 0;
 703}
 704
 705static const struct inode_operations nfs_dir_inode_operations = {
 706        .create         = nfs_create,
 707        .lookup         = nfs_lookup,
 708        .link           = nfs_link,
 709        .unlink         = nfs_unlink,
 710        .symlink        = nfs_symlink,
 711        .mkdir          = nfs_mkdir,
 712        .rmdir          = nfs_rmdir,
 713        .mknod          = nfs_mknod,
 714        .rename         = nfs_rename,
 715        .permission     = nfs_permission,
 716        .getattr        = nfs_getattr,
 717        .setattr        = nfs_setattr,
 718};
 719
 720static const struct inode_operations nfs_file_inode_operations = {
 721        .permission     = nfs_permission,
 722        .getattr        = nfs_getattr,
 723        .setattr        = nfs_setattr,
 724};
 725
 726const struct nfs_rpc_ops nfs_v2_clientops = {
 727        .version        = 2,                   /* protocol version */
 728        .dentry_ops     = &nfs_dentry_operations,
 729        .dir_inode_ops  = &nfs_dir_inode_operations,
 730        .file_inode_ops = &nfs_file_inode_operations,
 731        .file_ops       = &nfs_file_operations,
 732        .getroot        = nfs_proc_get_root,
 733        .submount       = nfs_submount,
 734        .try_mount      = nfs_try_mount,
 735        .getattr        = nfs_proc_getattr,
 736        .setattr        = nfs_proc_setattr,
 737        .lookup         = nfs_proc_lookup,
 738        .access         = NULL,                /* access */
 739        .readlink       = nfs_proc_readlink,
 740        .create         = nfs_proc_create,
 741        .remove         = nfs_proc_remove,
 742        .unlink_setup   = nfs_proc_unlink_setup,
 743        .unlink_rpc_prepare = nfs_proc_unlink_rpc_prepare,
 744        .unlink_done    = nfs_proc_unlink_done,
 745        .rename         = nfs_proc_rename,
 746        .rename_setup   = nfs_proc_rename_setup,
 747        .rename_rpc_prepare = nfs_proc_rename_rpc_prepare,
 748        .rename_done    = nfs_proc_rename_done,
 749        .link           = nfs_proc_link,
 750        .symlink        = nfs_proc_symlink,
 751        .mkdir          = nfs_proc_mkdir,
 752        .rmdir          = nfs_proc_rmdir,
 753        .readdir        = nfs_proc_readdir,
 754        .mknod          = nfs_proc_mknod,
 755        .statfs         = nfs_proc_statfs,
 756        .fsinfo         = nfs_proc_fsinfo,
 757        .pathconf       = nfs_proc_pathconf,
 758        .decode_dirent  = nfs2_decode_dirent,
 759        .read_setup     = nfs_proc_read_setup,
 760        .read_pageio_init = nfs_pageio_init_read,
 761        .read_rpc_prepare = nfs_proc_read_rpc_prepare,
 762        .read_done      = nfs_read_done,
 763        .write_setup    = nfs_proc_write_setup,
 764        .write_pageio_init = nfs_pageio_init_write,
 765        .write_rpc_prepare = nfs_proc_write_rpc_prepare,
 766        .write_done     = nfs_write_done,
 767        .commit_setup   = nfs_proc_commit_setup,
 768        .commit_rpc_prepare = nfs_proc_commit_rpc_prepare,
 769        .lock           = nfs_proc_lock,
 770        .lock_check_bounds = nfs_lock_check_bounds,
 771        .close_context  = nfs_close_context,
 772        .have_delegation = nfs_have_delegation,
 773        .return_delegation = nfs_return_delegation,
 774        .alloc_client   = nfs_alloc_client,
 775        .init_client    = nfs_init_client,
 776        .free_client    = nfs_free_client,
 777        .create_server  = nfs_create_server,
 778        .clone_server   = nfs_clone_server,
 779};
 780