fs/nfs/proc.c

   1 /*
   2  *  linux/fs/nfs/proc.c
   3  *
   4  *  Copyright (C) 1992, 1993, 1994  Rick Sladkey
   5  *
   6  *  OS-independent nfs remote procedure call functions
   7  *
   8  *  Tuned by Alan Cox <A.Cox@swansea.ac.uk> for >3K buffers
   9  *  so at last we can have decent(ish) throughput off a
  10  *  Sun server.
  11  *
  12  *  Coding optimized and cleaned up by Florian La Roche.
  13  *  Note: Error returns are optimized for NFS_OK, which isn't translated via
  14  *  nfs_stat_to_errno(), but happens to be already the right return code.
  15  *
  16  *  Also, the code currently doesn't check the size of the packet, when
  17  *  it decodes the packet.
  18  *
  19  *  Feel free to fix it and mail me the diffs if it worries you.
  20  *
  21  *  Completely rewritten to support the new RPC call interface;
  22  *  rewrote and moved the entire XDR stuff to xdr.c
  23  *  --Olaf Kirch June 1996
  24  *
  25  *  The code below initializes all auto variables explicitly, otherwise
  26  *  it will fail to work as a module (gcc generates a memset call for an
  27  *  incomplete struct).
  28  */
  29
  30 #include <linux/types.h>
  31 #include <linux/param.h>
  32 #include <linux/time.h>
  33 #include <linux/mm.h>
  34 #include <linux/errno.h>
  35 #include <linux/string.h>
  36 #include <linux/in.h>
  37 #include <linux/pagemap.h>
  38 #include <linux/sunrpc/clnt.h>
  39 #include <linux/nfs.h>
  40 #include <linux/nfs2.h>
  41 #include <linux/nfs_fs.h>
  42 #include <linux/nfs_page.h>
  43 #include <linux/lockd/bind.h>
  44 #include <linux/freezer.h>
  45 #include "internal.h"
  46
  47 #define NFSDBG_FACILITY         NFSDBG_PROC
  48
  49 /*
  50  * Bare-bones access to getattr: this is for nfs_read_super.
  51  */
  52 static int
  53 nfs_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
  54                   struct nfs_fsinfo *info)
  55 {
  56         struct nfs_fattr *fattr = info->fattr;
  57         struct nfs2_fsstat fsinfo;
  58         struct rpc_message msg = {
  59                 .rpc_proc       = &nfs_procedures[NFSPROC_GETATTR],
  60                 .rpc_argp       = fhandle,
  61                 .rpc_resp       = fattr,
  62         };
  63         int status;
  64
  65         dprintk("%s: call getattr\n", __func__);
  66         nfs_fattr_init(fattr);
  67         status = rpc_call_sync(server->client, &msg, 0);
  68         /* Retry with default authentication if different */
  69         if (status && server->nfs_client->cl_rpcclient != server->client)
  70                 status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
  71         dprintk("%s: reply getattr: %d\n", __func__, status);
  72         if (status)
  73                 return status;
  74         dprintk("%s: call statfs\n", __func__);
  75         msg.rpc_proc = &nfs_procedures[NFSPROC_STATFS];
  76         msg.rpc_resp = &fsinfo;
  77         status = rpc_call_sync(server->client, &msg, 0);
  78         /* Retry with default authentication if different */
  79         if (status && server->nfs_client->cl_rpcclient != server->client)
  80                 status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
  81         dprintk("%s: reply statfs: %d\n", __func__, status);
  82         if (status)
  83                 return status;
  84         info->rtmax  = NFS_MAXDATA;
  85         info->rtpref = fsinfo.tsize;
  86         info->rtmult = fsinfo.bsize;
  87         info->wtmax  = NFS_MAXDATA;
  88         info->wtpref = fsinfo.tsize;
  89         info->wtmult = fsinfo.bsize;
  90         info->dtpref = fsinfo.tsize;
  91         info->maxfilesize = 0x7FFFFFFF;
  92         info->lease_time = 0;
  93         return 0;
  94 }
  95
  96 /*
  97  * One function for each procedure in the NFS protocol.
  98  */
  99 static int
 100 nfs_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
 101                 struct nfs_fattr *fattr, struct nfs4_label *label)
 102 {
 103         struct rpc_message msg = {
 104                 .rpc_proc       = &nfs_procedures[NFSPROC_GETATTR],
 105                 .rpc_argp       = fhandle,
 106                 .rpc_resp       = fattr,
 107         };
 108         int     status;
 109
 110         dprintk("NFS call  getattr\n");
 111         nfs_fattr_init(fattr);
 112         status = rpc_call_sync(server->client, &msg, 0);
 113         dprintk("NFS reply getattr: %d\n", status);
 114         return status;
 115 }
 116
 117 static int
 118 nfs_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
 119                  struct iattr *sattr)
 120 {
 121         struct inode *inode = 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
 147 static int
 148 nfs_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
 175 static int nfs_proc_readlink(struct inode *inode, struct page *page,
 176                 unsigned int pgbase, unsigned int pglen)
 177 {
 178         struct nfs_readlinkargs args = {
 179                 .fh             = NFS_FH(inode),
 180                 .pgbase         = pgbase,
 181                 .pglen          = pglen,
 182                 .pages          = &page
 183         };
 184         struct rpc_message msg = {
 185                 .rpc_proc       = &nfs_procedures[NFSPROC_READLINK],
 186                 .rpc_argp       = &args,
 187         };
 188         int                     status;
 189
 190         dprintk("NFS call  readlink\n");
 191         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 192         dprintk("NFS reply readlink: %d\n", status);
 193         return status;
 194 }
 195
 196 struct nfs_createdata {
 197         struct nfs_createargs arg;
 198         struct nfs_diropok res;
 199         struct nfs_fh fhandle;
 200         struct nfs_fattr fattr;
 201 };
 202
 203 static struct nfs_createdata *nfs_alloc_createdata(struct inode *dir,
 204                 struct dentry *dentry, struct iattr *sattr)
 205 {
 206         struct nfs_createdata *data;
 207
 208         data = kmalloc(sizeof(*data), GFP_KERNEL);
 209
 210         if (data != NULL) {
 211                 data->arg.fh = NFS_FH(dir);
 212                 data->arg.name = dentry->d_name.name;
 213                 data->arg.len = dentry->d_name.len;
 214                 data->arg.sattr = sattr;
 215                 nfs_fattr_init(&data->fattr);
 216                 data->fhandle.size = 0;
 217                 data->res.fh = &data->fhandle;
 218                 data->res.fattr = &data->fattr;
 219         }
 220         return data;
 221 };
 222
 223 static void nfs_free_createdata(const struct nfs_createdata *data)
 224 {
 225         kfree(data);
 226 }
 227
 228 static int
 229 nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
 230                 int flags)
 231 {
 232         struct nfs_createdata *data;
 233         struct rpc_message msg = {
 234                 .rpc_proc       = &nfs_procedures[NFSPROC_CREATE],
 235         };
 236         int status = -ENOMEM;
 237
 238         dprintk("NFS call  create %pd\n", dentry);
 239         data = nfs_alloc_createdata(dir, dentry, sattr);
 240         if (data == NULL)
 241                 goto out;
 242         msg.rpc_argp = &data->arg;
 243         msg.rpc_resp = &data->res;
 244         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 245         nfs_mark_for_revalidate(dir);
 246         if (status == 0)
 247                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, NULL);
 248         nfs_free_createdata(data);
 249 out:
 250         dprintk("NFS reply create: %d\n", status);
 251         return status;
 252 }
 253
 254 /*
 255  * In NFSv2, mknod is grafted onto the create call.
 256  */
 257 static int
 258 nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
 259                dev_t rdev)
 260 {
 261         struct nfs_createdata *data;
 262         struct rpc_message msg = {
 263                 .rpc_proc       = &nfs_procedures[NFSPROC_CREATE],
 264         };
 265         umode_t mode;
 266         int status = -ENOMEM;
 267
 268         dprintk("NFS call  mknod %pd\n", dentry);
 269
 270         mode = sattr->ia_mode;
 271         if (S_ISFIFO(mode)) {
 272                 sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR;
 273                 sattr->ia_valid &= ~ATTR_SIZE;
 274         } else if (S_ISCHR(mode) || S_ISBLK(mode)) {
 275                 sattr->ia_valid |= ATTR_SIZE;
 276                 sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */
 277         }
 278
 279         data = nfs_alloc_createdata(dir, dentry, sattr);
 280         if (data == NULL)
 281                 goto out;
 282         msg.rpc_argp = &data->arg;
 283         msg.rpc_resp = &data->res;
 284
 285         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 286         nfs_mark_for_revalidate(dir);
 287
 288         if (status == -EINVAL && S_ISFIFO(mode)) {
 289                 sattr->ia_mode = mode;
 290                 nfs_fattr_init(data->res.fattr);
 291                 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 292         }
 293         if (status == 0)
 294                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, NULL);
 295         nfs_free_createdata(data);
 296 out:
 297         dprintk("NFS reply mknod: %d\n", status);
 298         return status;
 299 }
 300
 301 static int
 302 nfs_proc_remove(struct inode *dir, struct qstr *name)
 303 {
 304         struct nfs_removeargs arg = {
 305                 .fh = NFS_FH(dir),
 306                 .name = *name,
 307         };
 308         struct rpc_message msg = {
 309                 .rpc_proc = &nfs_procedures[NFSPROC_REMOVE],
 310                 .rpc_argp = &arg,
 311         };
 312         int                     status;
 313
 314         dprintk("NFS call  remove %s\n", name->name);
 315         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
 316         nfs_mark_for_revalidate(dir);
 317
 318         dprintk("NFS reply remove: %d\n", status);
 319         return status;
 320 }
 321
 322 static void
 323 nfs_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
 324 {
 325         msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE];
 326 }
 327
 328 static void nfs_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
 329 {
 330         rpc_call_start(task);
 331 }
 332
 333 static int nfs_proc_unlink_done(struct rpc_task *task, struct inode *dir)
 334 {
 335         nfs_mark_for_revalidate(dir);
 336         return 1;
 337 }
 338
 339 static void
 340 nfs_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
 341 {
 342         msg->rpc_proc = &nfs_procedures[NFSPROC_RENAME];
 343 }
 344
 345 static void nfs_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
 346 {
 347         rpc_call_start(task);
 348 }
 349
 350 static int
 351 nfs_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
 352                      struct inode *new_dir)
 353 {
 354         nfs_mark_for_revalidate(old_dir);
 355         nfs_mark_for_revalidate(new_dir);
 356         return 1;
 357 }
 358
 359 static int
 360 nfs_proc_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
 383 static int
 384 nfs_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
 406 static int
 407 nfs_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 %pd\n", dentry);
 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
 448 out_free:
 449         nfs_free_fattr(fattr);
 450         nfs_free_fhandle(fh);
 451 out:
 452         dprintk("NFS reply symlink: %d\n", status);
 453         return status;
 454 }
 455
 456 static int
 457 nfs_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 %pd\n", dentry);
 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);
 477 out:
 478         dprintk("NFS reply mkdir: %d\n", status);
 479         return status;
 480 }
 481
 482 static int
 483 nfs_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  */
 510 static int
 511 nfs_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
 537 static int
 538 nfs_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;
 561 out:
 562         return status;
 563 }
 564
 565 static int
 566 nfs_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;
 592 out:
 593         return status;
 594 }
 595
 596 static int
 597 nfs_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
 605 static 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
 621 static 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
 626 static int nfs_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
 627 {
 628         rpc_call_start(task);
 629         return 0;
 630 }
 631
 632 static int nfs_write_done(struct rpc_task *task, struct nfs_write_data *data)
 633 {
 634         struct inode *inode = data->header->inode;
 635
 636         if (task->tk_status >= 0)
 637                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
 638         return 0;
 639 }
 640
 641 static void nfs_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
 642 {
 643         /* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */
 644         data->args.stable = NFS_FILE_SYNC;
 645         msg->rpc_proc = &nfs_procedures[NFSPROC_WRITE];
 646 }
 647
 648 static int nfs_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
 649 {
 650         rpc_call_start(task);
 651         return 0;
 652 }
 653
 654 static void nfs_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
 655 {
 656         BUG();
 657 }
 658
 659 static void
 660 nfs_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
 661 {
 662         BUG();
 663 }
 664
 665 static int
 666 nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
 667 {
 668         struct inode *inode = file_inode(filp);
 669
 670         return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl);
 671 }
 672
 673 /* Helper functions for NFS lock bounds checking */
 674 #define NFS_LOCK32_OFFSET_MAX ((__s32)0x7fffffffUL)
 675 static int nfs_lock_check_bounds(const struct file_lock *fl)
 676 {
 677         __s32 start, end;
 678
 679         start = (__s32)fl->fl_start;
 680         if ((loff_t)start != fl->fl_start)
 681                 goto out_einval;
 682
 683         if (fl->fl_end != OFFSET_MAX) {
 684                 end = (__s32)fl->fl_end;
 685                 if ((loff_t)end != fl->fl_end)
 686                         goto out_einval;
 687         } else
 688                 end = NFS_LOCK32_OFFSET_MAX;
 689
 690         if (start < 0 || start > end)
 691                 goto out_einval;
 692         return 0;
 693 out_einval:
 694         return -EINVAL;
 695 }
 696
 697 static int nfs_have_delegation(struct inode *inode, fmode_t flags)
 698 {
 699         return 0;
 700 }
 701
 702 static int nfs_return_delegation(struct inode *inode)
 703 {
 704         nfs_wb_all(inode);
 705         return 0;
 706 }
 707
 708 static const struct inode_operations nfs_dir_inode_operations = {
 709         .create         = nfs_create,
 710         .lookup         = nfs_lookup,
 711         .link           = nfs_link,
 712         .unlink         = nfs_unlink,
 713         .symlink        = nfs_symlink,
 714         .mkdir          = nfs_mkdir,
 715         .rmdir          = nfs_rmdir,
 716         .mknod          = nfs_mknod,
 717         .rename         = nfs_rename,
 718         .permission     = nfs_permission,
 719         .getattr        = nfs_getattr,
 720         .setattr        = nfs_setattr,
 721 };
 722
 723 static const struct inode_operations nfs_file_inode_operations = {
 724         .permission     = nfs_permission,
 725         .getattr        = nfs_getattr,
 726         .setattr        = nfs_setattr,
 727 };
 728
 729 const struct nfs_rpc_ops nfs_v2_clientops = {
 730         .version        = 2,                   /* protocol version */
 731         .dentry_ops     = &nfs_dentry_operations,
 732         .dir_inode_ops  = &nfs_dir_inode_operations,
 733         .file_inode_ops = &nfs_file_inode_operations,
 734         .file_ops       = &nfs_file_operations,
 735         .getroot        = nfs_proc_get_root,
 736         .submount       = nfs_submount,
 737         .try_mount      = nfs_try_mount,
 738         .getattr        = nfs_proc_getattr,
 739         .setattr        = nfs_proc_setattr,
 740         .lookup         = nfs_proc_lookup,
 741         .access         = NULL,                /* access */
 742         .readlink       = nfs_proc_readlink,
 743         .create         = nfs_proc_create,
 744         .remove         = nfs_proc_remove,
 745         .unlink_setup   = nfs_proc_unlink_setup,
 746         .unlink_rpc_prepare = nfs_proc_unlink_rpc_prepare,
 747         .unlink_done    = nfs_proc_unlink_done,
 748         .rename         = nfs_proc_rename,
 749         .rename_setup   = nfs_proc_rename_setup,
 750         .rename_rpc_prepare = nfs_proc_rename_rpc_prepare,
 751         .rename_done    = nfs_proc_rename_done,
 752         .link           = nfs_proc_link,
 753         .symlink        = nfs_proc_symlink,
 754         .mkdir          = nfs_proc_mkdir,
 755         .rmdir          = nfs_proc_rmdir,
 756         .readdir        = nfs_proc_readdir,
 757         .mknod          = nfs_proc_mknod,
 758         .statfs         = nfs_proc_statfs,
 759         .fsinfo         = nfs_proc_fsinfo,
 760         .pathconf       = nfs_proc_pathconf,
 761         .decode_dirent  = nfs2_decode_dirent,
 762         .read_setup     = nfs_proc_read_setup,
 763         .read_pageio_init = nfs_pageio_init_read,
 764         .read_rpc_prepare = nfs_proc_read_rpc_prepare,
 765         .read_done      = nfs_read_done,
 766         .write_setup    = nfs_proc_write_setup,
 767         .write_pageio_init = nfs_pageio_init_write,
 768         .write_rpc_prepare = nfs_proc_write_rpc_prepare,
 769         .write_done     = nfs_write_done,
 770         .commit_setup   = nfs_proc_commit_setup,
 771         .commit_rpc_prepare = nfs_proc_commit_rpc_prepare,
 772         .lock           = nfs_proc_lock,
 773         .lock_check_bounds = nfs_lock_check_bounds,
 774         .close_context  = nfs_close_context,
 775         .have_delegation = nfs_have_delegation,
 776         .return_delegation = nfs_return_delegation,
 777         .alloc_client   = nfs_alloc_client,
 778         .init_client    = nfs_init_client,
 779         .free_client    = nfs_free_client,
 780         .create_server  = nfs_create_server,
 781         .clone_server   = nfs_clone_server,
 782 };