linux/fs/nfs/proc.c
<<
>>
Prefs
   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 * wrapper to handle the -EKEYEXPIRED error message. This should generally
  51 * only happen if using krb5 auth and a user's TGT expires. NFSv2 doesn't
  52 * support the NFSERR_JUKEBOX error code, but we handle this situation in the
  53 * same way that we handle that error with NFSv3.
  54 */
  55static int
  56nfs_rpc_wrapper(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
  57{
  58        int res;
  59        do {
  60                res = rpc_call_sync(clnt, msg, flags);
  61                if (res != -EKEYEXPIRED)
  62                        break;
  63                freezable_schedule_timeout_killable(NFS_JUKEBOX_RETRY_TIME);
  64                res = -ERESTARTSYS;
  65        } while (!fatal_signal_pending(current));
  66        return res;
  67}
  68
  69#define rpc_call_sync(clnt, msg, flags) nfs_rpc_wrapper(clnt, msg, flags)
  70
  71static int
  72nfs_async_handle_expired_key(struct rpc_task *task)
  73{
  74        if (task->tk_status != -EKEYEXPIRED)
  75                return 0;
  76        task->tk_status = 0;
  77        rpc_restart_call(task);
  78        rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
  79        return 1;
  80}
  81
  82/*
  83 * Bare-bones access to getattr: this is for nfs_read_super.
  84 */
  85static int
  86nfs_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
  87                  struct nfs_fsinfo *info)
  88{
  89        struct nfs_fattr *fattr = info->fattr;
  90        struct nfs2_fsstat fsinfo;
  91        struct rpc_message msg = {
  92                .rpc_proc       = &nfs_procedures[NFSPROC_GETATTR],
  93                .rpc_argp       = fhandle,
  94                .rpc_resp       = fattr,
  95        };
  96        int status;
  97
  98        dprintk("%s: call getattr\n", __func__);
  99        nfs_fattr_init(fattr);
 100        status = rpc_call_sync(server->client, &msg, 0);
 101        /* Retry with default authentication if different */
 102        if (status && server->nfs_client->cl_rpcclient != server->client)
 103                status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
 104        dprintk("%s: reply getattr: %d\n", __func__, status);
 105        if (status)
 106                return status;
 107        dprintk("%s: call statfs\n", __func__);
 108        msg.rpc_proc = &nfs_procedures[NFSPROC_STATFS];
 109        msg.rpc_resp = &fsinfo;
 110        status = rpc_call_sync(server->client, &msg, 0);
 111        /* Retry with default authentication if different */
 112        if (status && server->nfs_client->cl_rpcclient != server->client)
 113                status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
 114        dprintk("%s: reply statfs: %d\n", __func__, status);
 115        if (status)
 116                return status;
 117        info->rtmax  = NFS_MAXDATA;
 118        info->rtpref = fsinfo.tsize;
 119        info->rtmult = fsinfo.bsize;
 120        info->wtmax  = NFS_MAXDATA;
 121        info->wtpref = fsinfo.tsize;
 122        info->wtmult = fsinfo.bsize;
 123        info->dtpref = fsinfo.tsize;
 124        info->maxfilesize = 0x7FFFFFFF;
 125        info->lease_time = 0;
 126        return 0;
 127}
 128
 129/*
 130 * One function for each procedure in the NFS protocol.
 131 */
 132static int
 133nfs_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
 134                struct nfs_fattr *fattr)
 135{
 136        struct rpc_message msg = {
 137                .rpc_proc       = &nfs_procedures[NFSPROC_GETATTR],
 138                .rpc_argp       = fhandle,
 139                .rpc_resp       = fattr,
 140        };
 141        int     status;
 142
 143        dprintk("NFS call  getattr\n");
 144        nfs_fattr_init(fattr);
 145        status = rpc_call_sync(server->client, &msg, 0);
 146        dprintk("NFS reply getattr: %d\n", status);
 147        return status;
 148}
 149
 150static int
 151nfs_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
 152                 struct iattr *sattr)
 153{
 154        struct inode *inode = dentry->d_inode;
 155        struct nfs_sattrargs    arg = { 
 156                .fh     = NFS_FH(inode),
 157                .sattr  = sattr
 158        };
 159        struct rpc_message msg = {
 160                .rpc_proc       = &nfs_procedures[NFSPROC_SETATTR],
 161                .rpc_argp       = &arg,
 162                .rpc_resp       = fattr,
 163        };
 164        int     status;
 165
 166        /* Mask out the non-modebit related stuff from attr->ia_mode */
 167        sattr->ia_mode &= S_IALLUGO;
 168
 169        dprintk("NFS call  setattr\n");
 170        if (sattr->ia_valid & ATTR_FILE)
 171                msg.rpc_cred = nfs_file_cred(sattr->ia_file);
 172        nfs_fattr_init(fattr);
 173        status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 174        if (status == 0)
 175                nfs_setattr_update_inode(inode, sattr);
 176        dprintk("NFS reply setattr: %d\n", status);
 177        return status;
 178}
 179
 180static int
 181nfs_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qstr *name,
 182                struct nfs_fh *fhandle, struct nfs_fattr *fattr)
 183{
 184        struct nfs_diropargs    arg = {
 185                .fh             = NFS_FH(dir),
 186                .name           = name->name,
 187                .len            = name->len
 188        };
 189        struct nfs_diropok      res = {
 190                .fh             = fhandle,
 191                .fattr          = fattr
 192        };
 193        struct rpc_message msg = {
 194                .rpc_proc       = &nfs_procedures[NFSPROC_LOOKUP],
 195                .rpc_argp       = &arg,
 196                .rpc_resp       = &res,
 197        };
 198        int                     status;
 199
 200        dprintk("NFS call  lookup %s\n", name->name);
 201        nfs_fattr_init(fattr);
 202        status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 203        dprintk("NFS reply lookup: %d\n", status);
 204        return status;
 205}
 206
 207static int nfs_proc_readlink(struct inode *inode, struct page *page,
 208                unsigned int pgbase, unsigned int pglen)
 209{
 210        struct nfs_readlinkargs args = {
 211                .fh             = NFS_FH(inode),
 212                .pgbase         = pgbase,
 213                .pglen          = pglen,
 214                .pages          = &page
 215        };
 216        struct rpc_message msg = {
 217                .rpc_proc       = &nfs_procedures[NFSPROC_READLINK],
 218                .rpc_argp       = &args,
 219        };
 220        int                     status;
 221
 222        dprintk("NFS call  readlink\n");
 223        status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 224        dprintk("NFS reply readlink: %d\n", status);
 225        return status;
 226}
 227
 228struct nfs_createdata {
 229        struct nfs_createargs arg;
 230        struct nfs_diropok res;
 231        struct nfs_fh fhandle;
 232        struct nfs_fattr fattr;
 233};
 234
 235static struct nfs_createdata *nfs_alloc_createdata(struct inode *dir,
 236                struct dentry *dentry, struct iattr *sattr)
 237{
 238        struct nfs_createdata *data;
 239
 240        data = kmalloc(sizeof(*data), GFP_KERNEL);
 241
 242        if (data != NULL) {
 243                data->arg.fh = NFS_FH(dir);
 244                data->arg.name = dentry->d_name.name;
 245                data->arg.len = dentry->d_name.len;
 246                data->arg.sattr = sattr;
 247                nfs_fattr_init(&data->fattr);
 248                data->fhandle.size = 0;
 249                data->res.fh = &data->fhandle;
 250                data->res.fattr = &data->fattr;
 251        }
 252        return data;
 253};
 254
 255static void nfs_free_createdata(const struct nfs_createdata *data)
 256{
 257        kfree(data);
 258}
 259
 260static int
 261nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
 262                int flags, struct nfs_open_context *ctx)
 263{
 264        struct nfs_createdata *data;
 265        struct rpc_message msg = {
 266                .rpc_proc       = &nfs_procedures[NFSPROC_CREATE],
 267        };
 268        int status = -ENOMEM;
 269
 270        dprintk("NFS call  create %s\n", dentry->d_name.name);
 271        data = nfs_alloc_createdata(dir, dentry, sattr);
 272        if (data == NULL)
 273                goto out;
 274        msg.rpc_argp = &data->arg;
 275        msg.rpc_resp = &data->res;
 276        status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 277        nfs_mark_for_revalidate(dir);
 278        if (status == 0)
 279                status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
 280        nfs_free_createdata(data);
 281out:
 282        dprintk("NFS reply create: %d\n", status);
 283        return status;
 284}
 285
 286/*
 287 * In NFSv2, mknod is grafted onto the create call.
 288 */
 289static int
 290nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
 291               dev_t rdev)
 292{
 293        struct nfs_createdata *data;
 294        struct rpc_message msg = {
 295                .rpc_proc       = &nfs_procedures[NFSPROC_CREATE],
 296        };
 297        umode_t mode;
 298        int status = -ENOMEM;
 299
 300        dprintk("NFS call  mknod %s\n", dentry->d_name.name);
 301
 302        mode = sattr->ia_mode;
 303        if (S_ISFIFO(mode)) {
 304                sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR;
 305                sattr->ia_valid &= ~ATTR_SIZE;
 306        } else if (S_ISCHR(mode) || S_ISBLK(mode)) {
 307                sattr->ia_valid |= ATTR_SIZE;
 308                sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */
 309        }
 310
 311        data = nfs_alloc_createdata(dir, dentry, sattr);
 312        if (data == NULL)
 313                goto out;
 314        msg.rpc_argp = &data->arg;
 315        msg.rpc_resp = &data->res;
 316
 317        status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 318        nfs_mark_for_revalidate(dir);
 319
 320        if (status == -EINVAL && S_ISFIFO(mode)) {
 321                sattr->ia_mode = mode;
 322                nfs_fattr_init(data->res.fattr);
 323                status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 324        }
 325        if (status == 0)
 326                status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
 327        nfs_free_createdata(data);
 328out:
 329        dprintk("NFS reply mknod: %d\n", status);
 330        return status;
 331}
 332  
 333static int
 334nfs_proc_remove(struct inode *dir, struct qstr *name)
 335{
 336        struct nfs_removeargs arg = {
 337                .fh = NFS_FH(dir),
 338                .name.len = name->len,
 339                .name.name = name->name,
 340        };
 341        struct rpc_message msg = { 
 342                .rpc_proc = &nfs_procedures[NFSPROC_REMOVE],
 343                .rpc_argp = &arg,
 344        };
 345        int                     status;
 346
 347        dprintk("NFS call  remove %s\n", name->name);
 348        status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 349        nfs_mark_for_revalidate(dir);
 350
 351        dprintk("NFS reply remove: %d\n", status);
 352        return status;
 353}
 354
 355static void
 356nfs_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
 357{
 358        msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE];
 359}
 360
 361static int nfs_proc_unlink_done(struct rpc_task *task, struct inode *dir)
 362{
 363        if (nfs_async_handle_expired_key(task))
 364                return 0;
 365        nfs_mark_for_revalidate(dir);
 366        return 1;
 367}
 368
 369static void
 370nfs_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
 371{
 372        msg->rpc_proc = &nfs_procedures[NFSPROC_RENAME];
 373}
 374
 375static int
 376nfs_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
 377                     struct inode *new_dir)
 378{
 379        if (nfs_async_handle_expired_key(task))
 380                return 0;
 381        nfs_mark_for_revalidate(old_dir);
 382        nfs_mark_for_revalidate(new_dir);
 383        return 1;
 384}
 385
 386static int
 387nfs_proc_rename(struct inode *old_dir, struct qstr *old_name,
 388                struct inode *new_dir, struct qstr *new_name)
 389{
 390        struct nfs_renameargs   arg = {
 391                .old_dir        = NFS_FH(old_dir),
 392                .old_name       = old_name,
 393                .new_dir        = NFS_FH(new_dir),
 394                .new_name       = new_name,
 395        };
 396        struct rpc_message msg = {
 397                .rpc_proc       = &nfs_procedures[NFSPROC_RENAME],
 398                .rpc_argp       = &arg,
 399        };
 400        int                     status;
 401
 402        dprintk("NFS call  rename %s -> %s\n", old_name->name, new_name->name);
 403        status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
 404        nfs_mark_for_revalidate(old_dir);
 405        nfs_mark_for_revalidate(new_dir);
 406        dprintk("NFS reply rename: %d\n", status);
 407        return status;
 408}
 409
 410static int
 411nfs_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
 412{
 413        struct nfs_linkargs     arg = {
 414                .fromfh         = NFS_FH(inode),
 415                .tofh           = NFS_FH(dir),
 416                .toname         = name->name,
 417                .tolen          = name->len
 418        };
 419        struct rpc_message msg = {
 420                .rpc_proc       = &nfs_procedures[NFSPROC_LINK],
 421                .rpc_argp       = &arg,
 422        };
 423        int                     status;
 424
 425        dprintk("NFS call  link %s\n", name->name);
 426        status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 427        nfs_mark_for_revalidate(inode);
 428        nfs_mark_for_revalidate(dir);
 429        dprintk("NFS reply link: %d\n", status);
 430        return status;
 431}
 432
 433static int
 434nfs_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
 435                 unsigned int len, struct iattr *sattr)
 436{
 437        struct nfs_fh *fh;
 438        struct nfs_fattr *fattr;
 439        struct nfs_symlinkargs  arg = {
 440                .fromfh         = NFS_FH(dir),
 441                .fromname       = dentry->d_name.name,
 442                .fromlen        = dentry->d_name.len,
 443                .pages          = &page,
 444                .pathlen        = len,
 445                .sattr          = sattr
 446        };
 447        struct rpc_message msg = {
 448                .rpc_proc       = &nfs_procedures[NFSPROC_SYMLINK],
 449                .rpc_argp       = &arg,
 450        };
 451        int status = -ENAMETOOLONG;
 452
 453        dprintk("NFS call  symlink %s\n", dentry->d_name.name);
 454
 455        if (len > NFS2_MAXPATHLEN)
 456                goto out;
 457
 458        fh = nfs_alloc_fhandle();
 459        fattr = nfs_alloc_fattr();
 460        status = -ENOMEM;
 461        if (fh == NULL || fattr == NULL)
 462                goto out_free;
 463
 464        status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 465        nfs_mark_for_revalidate(dir);
 466
 467        /*
 468         * V2 SYMLINK requests don't return any attributes.  Setting the
 469         * filehandle size to zero indicates to nfs_instantiate that it
 470         * should fill in the data with a LOOKUP call on the wire.
 471         */
 472        if (status == 0)
 473                status = nfs_instantiate(dentry, fh, fattr);
 474
 475out_free:
 476        nfs_free_fattr(fattr);
 477        nfs_free_fhandle(fh);
 478out:
 479        dprintk("NFS reply symlink: %d\n", status);
 480        return status;
 481}
 482
 483static int
 484nfs_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
 485{
 486        struct nfs_createdata *data;
 487        struct rpc_message msg = {
 488                .rpc_proc       = &nfs_procedures[NFSPROC_MKDIR],
 489        };
 490        int status = -ENOMEM;
 491
 492        dprintk("NFS call  mkdir %s\n", dentry->d_name.name);
 493        data = nfs_alloc_createdata(dir, dentry, sattr);
 494        if (data == NULL)
 495                goto out;
 496        msg.rpc_argp = &data->arg;
 497        msg.rpc_resp = &data->res;
 498
 499        status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 500        nfs_mark_for_revalidate(dir);
 501        if (status == 0)
 502                status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
 503        nfs_free_createdata(data);
 504out:
 505        dprintk("NFS reply mkdir: %d\n", status);
 506        return status;
 507}
 508
 509static int
 510nfs_proc_rmdir(struct inode *dir, struct qstr *name)
 511{
 512        struct nfs_diropargs    arg = {
 513                .fh             = NFS_FH(dir),
 514                .name           = name->name,
 515                .len            = name->len
 516        };
 517        struct rpc_message msg = {
 518                .rpc_proc       = &nfs_procedures[NFSPROC_RMDIR],
 519                .rpc_argp       = &arg,
 520        };
 521        int                     status;
 522
 523        dprintk("NFS call  rmdir %s\n", name->name);
 524        status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 525        nfs_mark_for_revalidate(dir);
 526        dprintk("NFS reply rmdir: %d\n", status);
 527        return status;
 528}
 529
 530/*
 531 * The READDIR implementation is somewhat hackish - we pass a temporary
 532 * buffer to the encode function, which installs it in the receive
 533 * the receive iovec. The decode function just parses the reply to make
 534 * sure it is syntactically correct; the entries itself are decoded
 535 * from nfs_readdir by calling the decode_entry function directly.
 536 */
 537static int
 538nfs_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
 539                 u64 cookie, struct page **pages, unsigned int count, int plus)
 540{
 541        struct inode            *dir = dentry->d_inode;
 542        struct nfs_readdirargs  arg = {
 543                .fh             = NFS_FH(dir),
 544                .cookie         = cookie,
 545                .count          = count,
 546                .pages          = pages,
 547        };
 548        struct rpc_message      msg = {
 549                .rpc_proc       = &nfs_procedures[NFSPROC_READDIR],
 550                .rpc_argp       = &arg,
 551                .rpc_cred       = cred,
 552        };
 553        int                     status;
 554
 555        dprintk("NFS call  readdir %d\n", (unsigned int)cookie);
 556        status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 557
 558        nfs_invalidate_atime(dir);
 559
 560        dprintk("NFS reply readdir: %d\n", status);
 561        return status;
 562}
 563
 564static int
 565nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
 566                        struct nfs_fsstat *stat)
 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  statfs\n");
 577        nfs_fattr_init(stat->fattr);
 578        status = rpc_call_sync(server->client, &msg, 0);
 579        dprintk("NFS reply statfs: %d\n", status);
 580        if (status)
 581                goto out;
 582        stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize;
 583        stat->fbytes = (u64)fsinfo.bfree  * fsinfo.bsize;
 584        stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize;
 585        stat->tfiles = 0;
 586        stat->ffiles = 0;
 587        stat->afiles = 0;
 588out:
 589        return status;
 590}
 591
 592static int
 593nfs_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
 594                        struct nfs_fsinfo *info)
 595{
 596        struct nfs2_fsstat fsinfo;
 597        struct rpc_message msg = {
 598                .rpc_proc       = &nfs_procedures[NFSPROC_STATFS],
 599                .rpc_argp       = fhandle,
 600                .rpc_resp       = &fsinfo,
 601        };
 602        int     status;
 603
 604        dprintk("NFS call  fsinfo\n");
 605        nfs_fattr_init(info->fattr);
 606        status = rpc_call_sync(server->client, &msg, 0);
 607        dprintk("NFS reply fsinfo: %d\n", status);
 608        if (status)
 609                goto out;
 610        info->rtmax  = NFS_MAXDATA;
 611        info->rtpref = fsinfo.tsize;
 612        info->rtmult = fsinfo.bsize;
 613        info->wtmax  = NFS_MAXDATA;
 614        info->wtpref = fsinfo.tsize;
 615        info->wtmult = fsinfo.bsize;
 616        info->dtpref = fsinfo.tsize;
 617        info->maxfilesize = 0x7FFFFFFF;
 618        info->lease_time = 0;
 619out:
 620        return status;
 621}
 622
 623static int
 624nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
 625                  struct nfs_pathconf *info)
 626{
 627        info->max_link = 0;
 628        info->max_namelen = NFS2_MAXNAMLEN;
 629        return 0;
 630}
 631
 632static int nfs_read_done(struct rpc_task *task, struct nfs_read_data *data)
 633{
 634        if (nfs_async_handle_expired_key(task))
 635                return -EAGAIN;
 636
 637        nfs_invalidate_atime(data->inode);
 638        if (task->tk_status >= 0) {
 639                nfs_refresh_inode(data->inode, data->res.fattr);
 640                /* Emulate the eof flag, which isn't normally needed in NFSv2
 641                 * as it is guaranteed to always return the file attributes
 642                 */
 643                if (data->args.offset + data->args.count >= data->res.fattr->size)
 644                        data->res.eof = 1;
 645        }
 646        return 0;
 647}
 648
 649static void nfs_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
 650{
 651        msg->rpc_proc = &nfs_procedures[NFSPROC_READ];
 652}
 653
 654static int nfs_write_done(struct rpc_task *task, struct nfs_write_data *data)
 655{
 656        if (nfs_async_handle_expired_key(task))
 657                return -EAGAIN;
 658
 659        if (task->tk_status >= 0)
 660                nfs_post_op_update_inode_force_wcc(data->inode, data->res.fattr);
 661        return 0;
 662}
 663
 664static void nfs_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
 665{
 666        /* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */
 667        data->args.stable = NFS_FILE_SYNC;
 668        msg->rpc_proc = &nfs_procedures[NFSPROC_WRITE];
 669}
 670
 671static void
 672nfs_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
 673{
 674        BUG();
 675}
 676
 677static int
 678nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
 679{
 680        struct inode *inode = filp->f_path.dentry->d_inode;
 681
 682        return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl);
 683}
 684
 685/* Helper functions for NFS lock bounds checking */
 686#define NFS_LOCK32_OFFSET_MAX ((__s32)0x7fffffffUL)
 687static int nfs_lock_check_bounds(const struct file_lock *fl)
 688{
 689        __s32 start, end;
 690
 691        start = (__s32)fl->fl_start;
 692        if ((loff_t)start != fl->fl_start)
 693                goto out_einval;
 694
 695        if (fl->fl_end != OFFSET_MAX) {
 696                end = (__s32)fl->fl_end;
 697                if ((loff_t)end != fl->fl_end)
 698                        goto out_einval;
 699        } else
 700                end = NFS_LOCK32_OFFSET_MAX;
 701
 702        if (start < 0 || start > end)
 703                goto out_einval;
 704        return 0;
 705out_einval:
 706        return -EINVAL;
 707}
 708
 709const struct nfs_rpc_ops nfs_v2_clientops = {
 710        .version        = 2,                   /* protocol version */
 711        .dentry_ops     = &nfs_dentry_operations,
 712        .dir_inode_ops  = &nfs_dir_inode_operations,
 713        .file_inode_ops = &nfs_file_inode_operations,
 714        .file_ops       = &nfs_file_operations,
 715        .getroot        = nfs_proc_get_root,
 716        .getattr        = nfs_proc_getattr,
 717        .setattr        = nfs_proc_setattr,
 718        .lookup         = nfs_proc_lookup,
 719        .access         = NULL,                /* access */
 720        .readlink       = nfs_proc_readlink,
 721        .create         = nfs_proc_create,
 722        .remove         = nfs_proc_remove,
 723        .unlink_setup   = nfs_proc_unlink_setup,
 724        .unlink_done    = nfs_proc_unlink_done,
 725        .rename         = nfs_proc_rename,
 726        .rename_setup   = nfs_proc_rename_setup,
 727        .rename_done    = nfs_proc_rename_done,
 728        .link           = nfs_proc_link,
 729        .symlink        = nfs_proc_symlink,
 730        .mkdir          = nfs_proc_mkdir,
 731        .rmdir          = nfs_proc_rmdir,
 732        .readdir        = nfs_proc_readdir,
 733        .mknod          = nfs_proc_mknod,
 734        .statfs         = nfs_proc_statfs,
 735        .fsinfo         = nfs_proc_fsinfo,
 736        .pathconf       = nfs_proc_pathconf,
 737        .decode_dirent  = nfs2_decode_dirent,
 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        .lock           = nfs_proc_lock,
 744        .lock_check_bounds = nfs_lock_check_bounds,
 745        .close_context  = nfs_close_context,
 746        .init_client    = nfs_init_client,
 747};
 748