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, 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
 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                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
 175static 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
 196struct nfs_createdata {
 197        struct nfs_createargs arg;
 198        struct nfs_diropok res;
 199        struct nfs_fh fhandle;
 200        struct nfs_fattr fattr;
 201};
 202
 203static 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
 223static void nfs_free_createdata(const struct nfs_createdata *data)
 224{
 225        kfree(data);
 226}
 227
 228static int
 229nfs_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 %s\n", dentry->d_name.name);
 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);
 249out:
 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 */
 257static int
 258nfs_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 %s\n", dentry->d_name.name);
 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);
 296out:
 297        dprintk("NFS reply mknod: %d\n", status);
 298        return status;
 299}
 300  
 301static int
 302nfs_proc_remove(struct inode *dir, 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
 322static void
 323nfs_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
 324{
 325        msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE];
 326}
 327
 328static void nfs_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
 329{
 330        rpc_call_start(task);
 331}
 332
 333static int nfs_proc_unlink_done(struct rpc_task *task, struct inode *dir)
 334{
 335        nfs_mark_for_revalidate(dir);
 336        return 1;
 337}
 338
 339static void
 340nfs_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
 341{
 342        msg->rpc_proc = &nfs_procedures[NFSPROC_RENAME];
 343}
 344
 345static void nfs_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
 346{
 347        rpc_call_start(task);
 348}
 349
 350static int
 351nfs_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
 359static int
 360nfs_proc_rename(struct inode *old_dir, struct qstr *old_name,
 361                struct inode *new_dir, struct qstr *new_name)
 362{
 363        struct nfs_renameargs   arg = {
 364                .old_dir        = NFS_FH(old_dir),
 365                .old_name       = old_name,
 366                .new_dir        = NFS_FH(new_dir),
 367                .new_name       = new_name,
 368        };
 369        struct rpc_message msg = {
 370                .rpc_proc       = &nfs_procedures[NFSPROC_RENAME],
 371                .rpc_argp       = &arg,
 372        };
 373        int                     status;
 374
 375        dprintk("NFS call  rename %s -> %s\n", old_name->name, new_name->name);
 376        status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
 377        nfs_mark_for_revalidate(old_dir);
 378        nfs_mark_for_revalidate(new_dir);
 379        dprintk("NFS reply rename: %d\n", status);
 380        return status;
 381}
 382
 383static int
 384nfs_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
 385{
 386        struct nfs_linkargs     arg = {
 387                .fromfh         = NFS_FH(inode),
 388                .tofh           = NFS_FH(dir),
 389                .toname         = name->name,
 390                .tolen          = name->len
 391        };
 392        struct rpc_message msg = {
 393                .rpc_proc       = &nfs_procedures[NFSPROC_LINK],
 394                .rpc_argp       = &arg,
 395        };
 396        int                     status;
 397
 398        dprintk("NFS call  link %s\n", name->name);
 399        status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 400        nfs_mark_for_revalidate(inode);
 401        nfs_mark_for_revalidate(dir);
 402        dprintk("NFS reply link: %d\n", status);
 403        return status;
 404}
 405
 406static int
 407nfs_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
 408                 unsigned int len, struct iattr *sattr)
 409{
 410        struct nfs_fh *fh;
 411        struct nfs_fattr *fattr;
 412        struct nfs_symlinkargs  arg = {
 413                .fromfh         = NFS_FH(dir),
 414                .fromname       = dentry->d_name.name,
 415                .fromlen        = dentry->d_name.len,
 416                .pages          = &page,
 417                .pathlen        = len,
 418                .sattr          = sattr
 419        };
 420        struct rpc_message msg = {
 421                .rpc_proc       = &nfs_procedures[NFSPROC_SYMLINK],
 422                .rpc_argp       = &arg,
 423        };
 424        int status = -ENAMETOOLONG;
 425
 426        dprintk("NFS call  symlink %s\n", dentry->d_name.name);
 427
 428        if (len > NFS2_MAXPATHLEN)
 429                goto out;
 430
 431        fh = nfs_alloc_fhandle();
 432        fattr = nfs_alloc_fattr();
 433        status = -ENOMEM;
 434        if (fh == NULL || fattr == NULL)
 435                goto out_free;
 436
 437        status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 438        nfs_mark_for_revalidate(dir);
 439
 440        /*
 441         * V2 SYMLINK requests don't return any attributes.  Setting the
 442         * filehandle size to zero indicates to nfs_instantiate that it
 443         * should fill in the data with a LOOKUP call on the wire.
 444         */
 445        if (status == 0)
 446                status = nfs_instantiate(dentry, fh, fattr, NULL);
 447
 448out_free:
 449        nfs_free_fattr(fattr);
 450        nfs_free_fhandle(fh);
 451out:
 452        dprintk("NFS reply symlink: %d\n", status);
 453        return status;
 454}
 455
 456static int
 457nfs_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
 458{
 459        struct nfs_createdata *data;
 460        struct rpc_message msg = {
 461                .rpc_proc       = &nfs_procedures[NFSPROC_MKDIR],
 462        };
 463        int status = -ENOMEM;
 464
 465        dprintk("NFS call  mkdir %s\n", dentry->d_name.name);
 466        data = nfs_alloc_createdata(dir, dentry, sattr);
 467        if (data == NULL)
 468                goto out;
 469        msg.rpc_argp = &data->arg;
 470        msg.rpc_resp = &data->res;
 471
 472        status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 473        nfs_mark_for_revalidate(dir);
 474        if (status == 0)
 475                status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, NULL);
 476        nfs_free_createdata(data);
 477out:
 478        dprintk("NFS reply mkdir: %d\n", status);
 479        return status;
 480}
 481
 482static int
 483nfs_proc_rmdir(struct inode *dir, struct qstr *name)
 484{
 485        struct nfs_diropargs    arg = {
 486                .fh             = NFS_FH(dir),
 487                .name           = name->name,
 488                .len            = name->len
 489        };
 490        struct rpc_message msg = {
 491                .rpc_proc       = &nfs_procedures[NFSPROC_RMDIR],
 492                .rpc_argp       = &arg,
 493        };
 494        int                     status;
 495
 496        dprintk("NFS call  rmdir %s\n", name->name);
 497        status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 498        nfs_mark_for_revalidate(dir);
 499        dprintk("NFS reply rmdir: %d\n", status);
 500        return status;
 501}
 502
 503/*
 504 * The READDIR implementation is somewhat hackish - we pass a temporary
 505 * buffer to the encode function, which installs it in the receive
 506 * the receive iovec. The decode function just parses the reply to make
 507 * sure it is syntactically correct; the entries itself are decoded
 508 * from nfs_readdir by calling the decode_entry function directly.
 509 */
 510static int
 511nfs_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
 512                 u64 cookie, struct page **pages, unsigned int count, int plus)
 513{
 514        struct inode            *dir = dentry->d_inode;
 515        struct nfs_readdirargs  arg = {
 516                .fh             = NFS_FH(dir),
 517                .cookie         = cookie,
 518                .count          = count,
 519                .pages          = pages,
 520        };
 521        struct rpc_message      msg = {
 522                .rpc_proc       = &nfs_procedures[NFSPROC_READDIR],
 523                .rpc_argp       = &arg,
 524                .rpc_cred       = cred,
 525        };
 526        int                     status;
 527
 528        dprintk("NFS call  readdir %d\n", (unsigned int)cookie);
 529        status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 530
 531        nfs_invalidate_atime(dir);
 532
 533        dprintk("NFS reply readdir: %d\n", status);
 534        return status;
 535}
 536
 537static int
 538nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
 539                        struct nfs_fsstat *stat)
 540{
 541        struct nfs2_fsstat fsinfo;
 542        struct rpc_message msg = {
 543                .rpc_proc       = &nfs_procedures[NFSPROC_STATFS],
 544                .rpc_argp       = fhandle,
 545                .rpc_resp       = &fsinfo,
 546        };
 547        int     status;
 548
 549        dprintk("NFS call  statfs\n");
 550        nfs_fattr_init(stat->fattr);
 551        status = rpc_call_sync(server->client, &msg, 0);
 552        dprintk("NFS reply statfs: %d\n", status);
 553        if (status)
 554                goto out;
 555        stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize;
 556        stat->fbytes = (u64)fsinfo.bfree  * fsinfo.bsize;
 557        stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize;
 558        stat->tfiles = 0;
 559        stat->ffiles = 0;
 560        stat->afiles = 0;
 561out:
 562        return status;
 563}
 564
 565static int
 566nfs_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
 567                        struct nfs_fsinfo *info)
 568{
 569        struct nfs2_fsstat fsinfo;
 570        struct rpc_message msg = {
 571                .rpc_proc       = &nfs_procedures[NFSPROC_STATFS],
 572                .rpc_argp       = fhandle,
 573                .rpc_resp       = &fsinfo,
 574        };
 575        int     status;
 576
 577        dprintk("NFS call  fsinfo\n");
 578        nfs_fattr_init(info->fattr);
 579        status = rpc_call_sync(server->client, &msg, 0);
 580        dprintk("NFS reply fsinfo: %d\n", status);
 581        if (status)
 582                goto out;
 583        info->rtmax  = NFS_MAXDATA;
 584        info->rtpref = fsinfo.tsize;
 585        info->rtmult = fsinfo.bsize;
 586        info->wtmax  = NFS_MAXDATA;
 587        info->wtpref = fsinfo.tsize;
 588        info->wtmult = fsinfo.bsize;
 589        info->dtpref = fsinfo.tsize;
 590        info->maxfilesize = 0x7FFFFFFF;
 591        info->lease_time = 0;
 592out:
 593        return status;
 594}
 595
 596static int
 597nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
 598                  struct nfs_pathconf *info)
 599{
 600        info->max_link = 0;
 601        info->max_namelen = NFS2_MAXNAMLEN;
 602        return 0;
 603}
 604
 605static int nfs_read_done(struct rpc_task *task, struct nfs_read_data *data)
 606{
 607        struct inode *inode = data->header->inode;
 608
 609        nfs_invalidate_atime(inode);
 610        if (task->tk_status >= 0) {
 611                nfs_refresh_inode(inode, data->res.fattr);
 612                /* Emulate the eof flag, which isn't normally needed in NFSv2
 613                 * as it is guaranteed to always return the file attributes
 614                 */
 615                if (data->args.offset + data->res.count >= data->res.fattr->size)
 616                        data->res.eof = 1;
 617        }
 618        return 0;
 619}
 620
 621static void nfs_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
 622{
 623        msg->rpc_proc = &nfs_procedures[NFSPROC_READ];
 624}
 625
 626static void nfs_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
 627{
 628        rpc_call_start(task);
 629}
 630
 631static int nfs_write_done(struct rpc_task *task, struct nfs_write_data *data)
 632{
 633        struct inode *inode = data->header->inode;
 634
 635        if (task->tk_status >= 0)
 636                nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
 637        return 0;
 638}
 639
 640static void nfs_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
 641{
 642        /* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */
 643        data->args.stable = NFS_FILE_SYNC;
 644        msg->rpc_proc = &nfs_procedures[NFSPROC_WRITE];
 645}
 646
 647static void nfs_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
 648{
 649        rpc_call_start(task);
 650}
 651
 652static void nfs_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
 653{
 654        BUG();
 655}
 656
 657static void
 658nfs_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
 659{
 660        BUG();
 661}
 662
 663static int
 664nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
 665{
 666        struct inode *inode = file_inode(filp);
 667
 668        return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl);
 669}
 670
 671/* Helper functions for NFS lock bounds checking */
 672#define NFS_LOCK32_OFFSET_MAX ((__s32)0x7fffffffUL)
 673static int nfs_lock_check_bounds(const struct file_lock *fl)
 674{
 675        __s32 start, end;
 676
 677        start = (__s32)fl->fl_start;
 678        if ((loff_t)start != fl->fl_start)
 679                goto out_einval;
 680
 681        if (fl->fl_end != OFFSET_MAX) {
 682                end = (__s32)fl->fl_end;
 683                if ((loff_t)end != fl->fl_end)
 684                        goto out_einval;
 685        } else
 686                end = NFS_LOCK32_OFFSET_MAX;
 687
 688        if (start < 0 || start > end)
 689                goto out_einval;
 690        return 0;
 691out_einval:
 692        return -EINVAL;
 693}
 694
 695static int nfs_have_delegation(struct inode *inode, fmode_t flags)
 696{
 697        return 0;
 698}
 699
 700static int nfs_return_delegation(struct inode *inode)
 701{
 702        nfs_wb_all(inode);
 703        return 0;
 704}
 705
 706static const struct inode_operations nfs_dir_inode_operations = {
 707        .create         = nfs_create,
 708        .lookup         = nfs_lookup,
 709        .link           = nfs_link,
 710        .unlink         = nfs_unlink,
 711        .symlink        = nfs_symlink,
 712        .mkdir          = nfs_mkdir,
 713        .rmdir          = nfs_rmdir,
 714        .mknod          = nfs_mknod,
 715        .rename         = nfs_rename,
 716        .permission     = nfs_permission,
 717        .getattr        = nfs_getattr,
 718        .setattr        = nfs_setattr,
 719};
 720
 721static const struct inode_operations nfs_file_inode_operations = {
 722        .permission     = nfs_permission,
 723        .getattr        = nfs_getattr,
 724        .setattr        = nfs_setattr,
 725};
 726
 727const struct nfs_rpc_ops nfs_v2_clientops = {
 728        .version        = 2,                   /* protocol version */
 729        .dentry_ops     = &nfs_dentry_operations,
 730        .dir_inode_ops  = &nfs_dir_inode_operations,
 731        .file_inode_ops = &nfs_file_inode_operations,
 732        .file_ops       = &nfs_file_operations,
 733        .getroot        = nfs_proc_get_root,
 734        .submount       = nfs_submount,
 735        .try_mount      = nfs_try_mount,
 736        .getattr        = nfs_proc_getattr,
 737        .setattr        = nfs_proc_setattr,
 738        .lookup         = nfs_proc_lookup,
 739        .access         = NULL,                /* access */
 740        .readlink       = nfs_proc_readlink,
 741        .create         = nfs_proc_create,
 742        .remove         = nfs_proc_remove,
 743        .unlink_setup   = nfs_proc_unlink_setup,
 744        .unlink_rpc_prepare = nfs_proc_unlink_rpc_prepare,
 745        .unlink_done    = nfs_proc_unlink_done,
 746        .rename         = nfs_proc_rename,
 747        .rename_setup   = nfs_proc_rename_setup,
 748        .rename_rpc_prepare = nfs_proc_rename_rpc_prepare,
 749        .rename_done    = nfs_proc_rename_done,
 750        .link           = nfs_proc_link,
 751        .symlink        = nfs_proc_symlink,
 752        .mkdir          = nfs_proc_mkdir,
 753        .rmdir          = nfs_proc_rmdir,
 754        .readdir        = nfs_proc_readdir,
 755        .mknod          = nfs_proc_mknod,
 756        .statfs         = nfs_proc_statfs,
 757        .fsinfo         = nfs_proc_fsinfo,
 758        .pathconf       = nfs_proc_pathconf,
 759        .decode_dirent  = nfs2_decode_dirent,
 760        .read_setup     = nfs_proc_read_setup,
 761        .read_pageio_init = nfs_pageio_init_read,
 762        .read_rpc_prepare = nfs_proc_read_rpc_prepare,
 763        .read_done      = nfs_read_done,
 764        .write_setup    = nfs_proc_write_setup,
 765        .write_pageio_init = nfs_pageio_init_write,
 766        .write_rpc_prepare = nfs_proc_write_rpc_prepare,
 767        .write_done     = nfs_write_done,
 768        .commit_setup   = nfs_proc_commit_setup,
 769        .commit_rpc_prepare = nfs_proc_commit_rpc_prepare,
 770        .lock           = nfs_proc_lock,
 771        .lock_check_bounds = nfs_lock_check_bounds,
 772        .close_context  = nfs_close_context,
 773        .have_delegation = nfs_have_delegation,
 774        .return_delegation = nfs_return_delegation,
 775        .alloc_client   = nfs_alloc_client,
 776        .init_client    = nfs_init_client,
 777        .free_client    = nfs_free_client,
 778        .create_server  = nfs_create_server,
 779        .clone_server   = nfs_clone_server,
 780};
 781