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 * 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 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)
 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 = *name,
 339        };
 340        struct rpc_message msg = { 
 341                .rpc_proc = &nfs_procedures[NFSPROC_REMOVE],
 342                .rpc_argp = &arg,
 343        };
 344        int                     status;
 345
 346        dprintk("NFS call  remove %s\n", name->name);
 347        status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 348        nfs_mark_for_revalidate(dir);
 349
 350        dprintk("NFS reply remove: %d\n", status);
 351        return status;
 352}
 353
 354static void
 355nfs_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
 356{
 357        msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE];
 358}
 359
 360static void nfs_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
 361{
 362        rpc_call_start(task);
 363}
 364
 365static int nfs_proc_unlink_done(struct rpc_task *task, struct inode *dir)
 366{
 367        if (nfs_async_handle_expired_key(task))
 368                return 0;
 369        nfs_mark_for_revalidate(dir);
 370        return 1;
 371}
 372
 373static void
 374nfs_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
 375{
 376        msg->rpc_proc = &nfs_procedures[NFSPROC_RENAME];
 377}
 378
 379static void nfs_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
 380{
 381        rpc_call_start(task);
 382}
 383
 384static int
 385nfs_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
 386                     struct inode *new_dir)
 387{
 388        if (nfs_async_handle_expired_key(task))
 389                return 0;
 390        nfs_mark_for_revalidate(old_dir);
 391        nfs_mark_for_revalidate(new_dir);
 392        return 1;
 393}
 394
 395static int
 396nfs_proc_rename(struct inode *old_dir, struct qstr *old_name,
 397                struct inode *new_dir, struct qstr *new_name)
 398{
 399        struct nfs_renameargs   arg = {
 400                .old_dir        = NFS_FH(old_dir),
 401                .old_name       = old_name,
 402                .new_dir        = NFS_FH(new_dir),
 403                .new_name       = new_name,
 404        };
 405        struct rpc_message msg = {
 406                .rpc_proc       = &nfs_procedures[NFSPROC_RENAME],
 407                .rpc_argp       = &arg,
 408        };
 409        int                     status;
 410
 411        dprintk("NFS call  rename %s -> %s\n", old_name->name, new_name->name);
 412        status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
 413        nfs_mark_for_revalidate(old_dir);
 414        nfs_mark_for_revalidate(new_dir);
 415        dprintk("NFS reply rename: %d\n", status);
 416        return status;
 417}
 418
 419static int
 420nfs_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
 421{
 422        struct nfs_linkargs     arg = {
 423                .fromfh         = NFS_FH(inode),
 424                .tofh           = NFS_FH(dir),
 425                .toname         = name->name,
 426                .tolen          = name->len
 427        };
 428        struct rpc_message msg = {
 429                .rpc_proc       = &nfs_procedures[NFSPROC_LINK],
 430                .rpc_argp       = &arg,
 431        };
 432        int                     status;
 433
 434        dprintk("NFS call  link %s\n", name->name);
 435        status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 436        nfs_mark_for_revalidate(inode);
 437        nfs_mark_for_revalidate(dir);
 438        dprintk("NFS reply link: %d\n", status);
 439        return status;
 440}
 441
 442static int
 443nfs_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
 444                 unsigned int len, struct iattr *sattr)
 445{
 446        struct nfs_fh *fh;
 447        struct nfs_fattr *fattr;
 448        struct nfs_symlinkargs  arg = {
 449                .fromfh         = NFS_FH(dir),
 450                .fromname       = dentry->d_name.name,
 451                .fromlen        = dentry->d_name.len,
 452                .pages          = &page,
 453                .pathlen        = len,
 454                .sattr          = sattr
 455        };
 456        struct rpc_message msg = {
 457                .rpc_proc       = &nfs_procedures[NFSPROC_SYMLINK],
 458                .rpc_argp       = &arg,
 459        };
 460        int status = -ENAMETOOLONG;
 461
 462        dprintk("NFS call  symlink %s\n", dentry->d_name.name);
 463
 464        if (len > NFS2_MAXPATHLEN)
 465                goto out;
 466
 467        fh = nfs_alloc_fhandle();
 468        fattr = nfs_alloc_fattr();
 469        status = -ENOMEM;
 470        if (fh == NULL || fattr == NULL)
 471                goto out_free;
 472
 473        status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 474        nfs_mark_for_revalidate(dir);
 475
 476        /*
 477         * V2 SYMLINK requests don't return any attributes.  Setting the
 478         * filehandle size to zero indicates to nfs_instantiate that it
 479         * should fill in the data with a LOOKUP call on the wire.
 480         */
 481        if (status == 0)
 482                status = nfs_instantiate(dentry, fh, fattr);
 483
 484out_free:
 485        nfs_free_fattr(fattr);
 486        nfs_free_fhandle(fh);
 487out:
 488        dprintk("NFS reply symlink: %d\n", status);
 489        return status;
 490}
 491
 492static int
 493nfs_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
 494{
 495        struct nfs_createdata *data;
 496        struct rpc_message msg = {
 497                .rpc_proc       = &nfs_procedures[NFSPROC_MKDIR],
 498        };
 499        int status = -ENOMEM;
 500
 501        dprintk("NFS call  mkdir %s\n", dentry->d_name.name);
 502        data = nfs_alloc_createdata(dir, dentry, sattr);
 503        if (data == NULL)
 504                goto out;
 505        msg.rpc_argp = &data->arg;
 506        msg.rpc_resp = &data->res;
 507
 508        status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 509        nfs_mark_for_revalidate(dir);
 510        if (status == 0)
 511                status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
 512        nfs_free_createdata(data);
 513out:
 514        dprintk("NFS reply mkdir: %d\n", status);
 515        return status;
 516}
 517
 518static int
 519nfs_proc_rmdir(struct inode *dir, struct qstr *name)
 520{
 521        struct nfs_diropargs    arg = {
 522                .fh             = NFS_FH(dir),
 523                .name           = name->name,
 524                .len            = name->len
 525        };
 526        struct rpc_message msg = {
 527                .rpc_proc       = &nfs_procedures[NFSPROC_RMDIR],
 528                .rpc_argp       = &arg,
 529        };
 530        int                     status;
 531
 532        dprintk("NFS call  rmdir %s\n", name->name);
 533        status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 534        nfs_mark_for_revalidate(dir);
 535        dprintk("NFS reply rmdir: %d\n", status);
 536        return status;
 537}
 538
 539/*
 540 * The READDIR implementation is somewhat hackish - we pass a temporary
 541 * buffer to the encode function, which installs it in the receive
 542 * the receive iovec. The decode function just parses the reply to make
 543 * sure it is syntactically correct; the entries itself are decoded
 544 * from nfs_readdir by calling the decode_entry function directly.
 545 */
 546static int
 547nfs_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
 548                 u64 cookie, struct page **pages, unsigned int count, int plus)
 549{
 550        struct inode            *dir = dentry->d_inode;
 551        struct nfs_readdirargs  arg = {
 552                .fh             = NFS_FH(dir),
 553                .cookie         = cookie,
 554                .count          = count,
 555                .pages          = pages,
 556        };
 557        struct rpc_message      msg = {
 558                .rpc_proc       = &nfs_procedures[NFSPROC_READDIR],
 559                .rpc_argp       = &arg,
 560                .rpc_cred       = cred,
 561        };
 562        int                     status;
 563
 564        dprintk("NFS call  readdir %d\n", (unsigned int)cookie);
 565        status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 566
 567        nfs_invalidate_atime(dir);
 568
 569        dprintk("NFS reply readdir: %d\n", status);
 570        return status;
 571}
 572
 573static int
 574nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
 575                        struct nfs_fsstat *stat)
 576{
 577        struct nfs2_fsstat fsinfo;
 578        struct rpc_message msg = {
 579                .rpc_proc       = &nfs_procedures[NFSPROC_STATFS],
 580                .rpc_argp       = fhandle,
 581                .rpc_resp       = &fsinfo,
 582        };
 583        int     status;
 584
 585        dprintk("NFS call  statfs\n");
 586        nfs_fattr_init(stat->fattr);
 587        status = rpc_call_sync(server->client, &msg, 0);
 588        dprintk("NFS reply statfs: %d\n", status);
 589        if (status)
 590                goto out;
 591        stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize;
 592        stat->fbytes = (u64)fsinfo.bfree  * fsinfo.bsize;
 593        stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize;
 594        stat->tfiles = 0;
 595        stat->ffiles = 0;
 596        stat->afiles = 0;
 597out:
 598        return status;
 599}
 600
 601static int
 602nfs_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
 603                        struct nfs_fsinfo *info)
 604{
 605        struct nfs2_fsstat fsinfo;
 606        struct rpc_message msg = {
 607                .rpc_proc       = &nfs_procedures[NFSPROC_STATFS],
 608                .rpc_argp       = fhandle,
 609                .rpc_resp       = &fsinfo,
 610        };
 611        int     status;
 612
 613        dprintk("NFS call  fsinfo\n");
 614        nfs_fattr_init(info->fattr);
 615        status = rpc_call_sync(server->client, &msg, 0);
 616        dprintk("NFS reply fsinfo: %d\n", status);
 617        if (status)
 618                goto out;
 619        info->rtmax  = NFS_MAXDATA;
 620        info->rtpref = fsinfo.tsize;
 621        info->rtmult = fsinfo.bsize;
 622        info->wtmax  = NFS_MAXDATA;
 623        info->wtpref = fsinfo.tsize;
 624        info->wtmult = fsinfo.bsize;
 625        info->dtpref = fsinfo.tsize;
 626        info->maxfilesize = 0x7FFFFFFF;
 627        info->lease_time = 0;
 628out:
 629        return status;
 630}
 631
 632static int
 633nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
 634                  struct nfs_pathconf *info)
 635{
 636        info->max_link = 0;
 637        info->max_namelen = NFS2_MAXNAMLEN;
 638        return 0;
 639}
 640
 641static int nfs_read_done(struct rpc_task *task, struct nfs_read_data *data)
 642{
 643        struct inode *inode = data->header->inode;
 644
 645        if (nfs_async_handle_expired_key(task))
 646                return -EAGAIN;
 647
 648        nfs_invalidate_atime(inode);
 649        if (task->tk_status >= 0) {
 650                nfs_refresh_inode(inode, data->res.fattr);
 651                /* Emulate the eof flag, which isn't normally needed in NFSv2
 652                 * as it is guaranteed to always return the file attributes
 653                 */
 654                if (data->args.offset + data->res.count >= data->res.fattr->size)
 655                        data->res.eof = 1;
 656        }
 657        return 0;
 658}
 659
 660static void nfs_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
 661{
 662        msg->rpc_proc = &nfs_procedures[NFSPROC_READ];
 663}
 664
 665static void nfs_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
 666{
 667        rpc_call_start(task);
 668}
 669
 670static int nfs_write_done(struct rpc_task *task, struct nfs_write_data *data)
 671{
 672        struct inode *inode = data->header->inode;
 673
 674        if (nfs_async_handle_expired_key(task))
 675                return -EAGAIN;
 676
 677        if (task->tk_status >= 0)
 678                nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
 679        return 0;
 680}
 681
 682static void nfs_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
 683{
 684        /* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */
 685        data->args.stable = NFS_FILE_SYNC;
 686        msg->rpc_proc = &nfs_procedures[NFSPROC_WRITE];
 687}
 688
 689static void nfs_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
 690{
 691        rpc_call_start(task);
 692}
 693
 694static void nfs_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
 695{
 696        BUG();
 697}
 698
 699static void
 700nfs_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
 701{
 702        BUG();
 703}
 704
 705static int
 706nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
 707{
 708        struct inode *inode = filp->f_path.dentry->d_inode;
 709
 710        return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl);
 711}
 712
 713/* Helper functions for NFS lock bounds checking */
 714#define NFS_LOCK32_OFFSET_MAX ((__s32)0x7fffffffUL)
 715static int nfs_lock_check_bounds(const struct file_lock *fl)
 716{
 717        __s32 start, end;
 718
 719        start = (__s32)fl->fl_start;
 720        if ((loff_t)start != fl->fl_start)
 721                goto out_einval;
 722
 723        if (fl->fl_end != OFFSET_MAX) {
 724                end = (__s32)fl->fl_end;
 725                if ((loff_t)end != fl->fl_end)
 726                        goto out_einval;
 727        } else
 728                end = NFS_LOCK32_OFFSET_MAX;
 729
 730        if (start < 0 || start > end)
 731                goto out_einval;
 732        return 0;
 733out_einval:
 734        return -EINVAL;
 735}
 736
 737static int nfs_have_delegation(struct inode *inode, fmode_t flags)
 738{
 739        return 0;
 740}
 741
 742static int nfs_return_delegation(struct inode *inode)
 743{
 744        nfs_wb_all(inode);
 745        return 0;
 746}
 747
 748static const struct inode_operations nfs_dir_inode_operations = {
 749        .create         = nfs_create,
 750        .lookup         = nfs_lookup,
 751        .link           = nfs_link,
 752        .unlink         = nfs_unlink,
 753        .symlink        = nfs_symlink,
 754        .mkdir          = nfs_mkdir,
 755        .rmdir          = nfs_rmdir,
 756        .mknod          = nfs_mknod,
 757        .rename         = nfs_rename,
 758        .permission     = nfs_permission,
 759        .getattr        = nfs_getattr,
 760        .setattr        = nfs_setattr,
 761};
 762
 763static const struct inode_operations nfs_file_inode_operations = {
 764        .permission     = nfs_permission,
 765        .getattr        = nfs_getattr,
 766        .setattr        = nfs_setattr,
 767};
 768
 769const struct nfs_rpc_ops nfs_v2_clientops = {
 770        .version        = 2,                   /* protocol version */
 771        .dentry_ops     = &nfs_dentry_operations,
 772        .dir_inode_ops  = &nfs_dir_inode_operations,
 773        .file_inode_ops = &nfs_file_inode_operations,
 774        .file_ops       = &nfs_file_operations,
 775        .getroot        = nfs_proc_get_root,
 776        .submount       = nfs_submount,
 777        .try_mount      = nfs_try_mount,
 778        .getattr        = nfs_proc_getattr,
 779        .setattr        = nfs_proc_setattr,
 780        .lookup         = nfs_proc_lookup,
 781        .access         = NULL,                /* access */
 782        .readlink       = nfs_proc_readlink,
 783        .create         = nfs_proc_create,
 784        .remove         = nfs_proc_remove,
 785        .unlink_setup   = nfs_proc_unlink_setup,
 786        .unlink_rpc_prepare = nfs_proc_unlink_rpc_prepare,
 787        .unlink_done    = nfs_proc_unlink_done,
 788        .rename         = nfs_proc_rename,
 789        .rename_setup   = nfs_proc_rename_setup,
 790        .rename_rpc_prepare = nfs_proc_rename_rpc_prepare,
 791        .rename_done    = nfs_proc_rename_done,
 792        .link           = nfs_proc_link,
 793        .symlink        = nfs_proc_symlink,
 794        .mkdir          = nfs_proc_mkdir,
 795        .rmdir          = nfs_proc_rmdir,
 796        .readdir        = nfs_proc_readdir,
 797        .mknod          = nfs_proc_mknod,
 798        .statfs         = nfs_proc_statfs,
 799        .fsinfo         = nfs_proc_fsinfo,
 800        .pathconf       = nfs_proc_pathconf,
 801        .decode_dirent  = nfs2_decode_dirent,
 802        .read_setup     = nfs_proc_read_setup,
 803        .read_pageio_init = nfs_pageio_init_read,
 804        .read_rpc_prepare = nfs_proc_read_rpc_prepare,
 805        .read_done      = nfs_read_done,
 806        .write_setup    = nfs_proc_write_setup,
 807        .write_pageio_init = nfs_pageio_init_write,
 808        .write_rpc_prepare = nfs_proc_write_rpc_prepare,
 809        .write_done     = nfs_write_done,
 810        .commit_setup   = nfs_proc_commit_setup,
 811        .commit_rpc_prepare = nfs_proc_commit_rpc_prepare,
 812        .lock           = nfs_proc_lock,
 813        .lock_check_bounds = nfs_lock_check_bounds,
 814        .close_context  = nfs_close_context,
 815        .have_delegation = nfs_have_delegation,
 816        .return_delegation = nfs_return_delegation,
 817        .alloc_client   = nfs_alloc_client,
 818        .init_client    = nfs_init_client,
 819        .free_client    = nfs_free_client,
 820        .create_server  = nfs_create_server,
 821        .clone_server   = nfs_clone_server,
 822};
 823
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