linux/fs/nfsd/nfs3proc.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Process version 3 NFS requests.
   4 *
   5 * Copyright (C) 1996, 1997, 1998 Olaf Kirch <okir@monad.swb.de>
   6 */
   7
   8#include <linux/fs.h>
   9#include <linux/ext2_fs.h>
  10#include <linux/magic.h>
  11
  12#include "cache.h"
  13#include "xdr3.h"
  14#include "vfs.h"
  15
  16#define NFSDDBG_FACILITY                NFSDDBG_PROC
  17
  18#define RETURN_STATUS(st)       { resp->status = (st); return (st); }
  19
  20static int      nfs3_ftypes[] = {
  21        0,                      /* NF3NON */
  22        S_IFREG,                /* NF3REG */
  23        S_IFDIR,                /* NF3DIR */
  24        S_IFBLK,                /* NF3BLK */
  25        S_IFCHR,                /* NF3CHR */
  26        S_IFLNK,                /* NF3LNK */
  27        S_IFSOCK,               /* NF3SOCK */
  28        S_IFIFO,                /* NF3FIFO */
  29};
  30
  31/*
  32 * NULL call.
  33 */
  34static __be32
  35nfsd3_proc_null(struct svc_rqst *rqstp)
  36{
  37        return nfs_ok;
  38}
  39
  40/*
  41 * Get a file's attributes
  42 */
  43static __be32
  44nfsd3_proc_getattr(struct svc_rqst *rqstp)
  45{
  46        struct nfsd_fhandle *argp = rqstp->rq_argp;
  47        struct nfsd3_attrstat *resp = rqstp->rq_resp;
  48        __be32  nfserr;
  49
  50        dprintk("nfsd: GETATTR(3)  %s\n",
  51                SVCFH_fmt(&argp->fh));
  52
  53        fh_copy(&resp->fh, &argp->fh);
  54        nfserr = fh_verify(rqstp, &resp->fh, 0,
  55                        NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
  56        if (nfserr)
  57                RETURN_STATUS(nfserr);
  58
  59        nfserr = fh_getattr(&resp->fh, &resp->stat);
  60
  61        RETURN_STATUS(nfserr);
  62}
  63
  64/*
  65 * Set a file's attributes
  66 */
  67static __be32
  68nfsd3_proc_setattr(struct svc_rqst *rqstp)
  69{
  70        struct nfsd3_sattrargs *argp = rqstp->rq_argp;
  71        struct nfsd3_attrstat *resp = rqstp->rq_resp;
  72        __be32  nfserr;
  73
  74        dprintk("nfsd: SETATTR(3)  %s\n",
  75                                SVCFH_fmt(&argp->fh));
  76
  77        fh_copy(&resp->fh, &argp->fh);
  78        nfserr = nfsd_setattr(rqstp, &resp->fh, &argp->attrs,
  79                              argp->check_guard, argp->guardtime);
  80        RETURN_STATUS(nfserr);
  81}
  82
  83/*
  84 * Look up a path name component
  85 */
  86static __be32
  87nfsd3_proc_lookup(struct svc_rqst *rqstp)
  88{
  89        struct nfsd3_diropargs *argp = rqstp->rq_argp;
  90        struct nfsd3_diropres  *resp = rqstp->rq_resp;
  91        __be32  nfserr;
  92
  93        dprintk("nfsd: LOOKUP(3)   %s %.*s\n",
  94                                SVCFH_fmt(&argp->fh),
  95                                argp->len,
  96                                argp->name);
  97
  98        fh_copy(&resp->dirfh, &argp->fh);
  99        fh_init(&resp->fh, NFS3_FHSIZE);
 100
 101        nfserr = nfsd_lookup(rqstp, &resp->dirfh,
 102                                    argp->name,
 103                                    argp->len,
 104                                    &resp->fh);
 105        RETURN_STATUS(nfserr);
 106}
 107
 108/*
 109 * Check file access
 110 */
 111static __be32
 112nfsd3_proc_access(struct svc_rqst *rqstp)
 113{
 114        struct nfsd3_accessargs *argp = rqstp->rq_argp;
 115        struct nfsd3_accessres *resp = rqstp->rq_resp;
 116        __be32  nfserr;
 117
 118        dprintk("nfsd: ACCESS(3)   %s 0x%x\n",
 119                                SVCFH_fmt(&argp->fh),
 120                                argp->access);
 121
 122        fh_copy(&resp->fh, &argp->fh);
 123        resp->access = argp->access;
 124        nfserr = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
 125        RETURN_STATUS(nfserr);
 126}
 127
 128/*
 129 * Read a symlink.
 130 */
 131static __be32
 132nfsd3_proc_readlink(struct svc_rqst *rqstp)
 133{
 134        struct nfsd3_readlinkargs *argp = rqstp->rq_argp;
 135        struct nfsd3_readlinkres *resp = rqstp->rq_resp;
 136        __be32 nfserr;
 137
 138        dprintk("nfsd: READLINK(3) %s\n", SVCFH_fmt(&argp->fh));
 139
 140        /* Read the symlink. */
 141        fh_copy(&resp->fh, &argp->fh);
 142        resp->len = NFS3_MAXPATHLEN;
 143        nfserr = nfsd_readlink(rqstp, &resp->fh, argp->buffer, &resp->len);
 144        RETURN_STATUS(nfserr);
 145}
 146
 147/*
 148 * Read a portion of a file.
 149 */
 150static __be32
 151nfsd3_proc_read(struct svc_rqst *rqstp)
 152{
 153        struct nfsd3_readargs *argp = rqstp->rq_argp;
 154        struct nfsd3_readres *resp = rqstp->rq_resp;
 155        __be32  nfserr;
 156        u32     max_blocksize = svc_max_payload(rqstp);
 157        unsigned long cnt = min(argp->count, max_blocksize);
 158
 159        dprintk("nfsd: READ(3) %s %lu bytes at %Lu\n",
 160                                SVCFH_fmt(&argp->fh),
 161                                (unsigned long) argp->count,
 162                                (unsigned long long) argp->offset);
 163
 164        /* Obtain buffer pointer for payload.
 165         * 1 (status) + 22 (post_op_attr) + 1 (count) + 1 (eof)
 166         * + 1 (xdr opaque byte count) = 26
 167         */
 168        resp->count = cnt;
 169        svc_reserve_auth(rqstp, ((1 + NFS3_POST_OP_ATTR_WORDS + 3)<<2) + resp->count +4);
 170
 171        fh_copy(&resp->fh, &argp->fh);
 172        nfserr = nfsd_read(rqstp, &resp->fh,
 173                                  argp->offset,
 174                                  rqstp->rq_vec, argp->vlen,
 175                                  &resp->count);
 176        if (nfserr == 0) {
 177                struct inode    *inode = d_inode(resp->fh.fh_dentry);
 178                resp->eof = nfsd_eof_on_read(cnt, resp->count, argp->offset,
 179                                                        inode->i_size);
 180        }
 181
 182        RETURN_STATUS(nfserr);
 183}
 184
 185/*
 186 * Write data to a file
 187 */
 188static __be32
 189nfsd3_proc_write(struct svc_rqst *rqstp)
 190{
 191        struct nfsd3_writeargs *argp = rqstp->rq_argp;
 192        struct nfsd3_writeres *resp = rqstp->rq_resp;
 193        __be32  nfserr;
 194        unsigned long cnt = argp->len;
 195        unsigned int nvecs;
 196
 197        dprintk("nfsd: WRITE(3)    %s %d bytes at %Lu%s\n",
 198                                SVCFH_fmt(&argp->fh),
 199                                argp->len,
 200                                (unsigned long long) argp->offset,
 201                                argp->stable? " stable" : "");
 202
 203        fh_copy(&resp->fh, &argp->fh);
 204        resp->committed = argp->stable;
 205        nvecs = svc_fill_write_vector(rqstp, rqstp->rq_arg.pages,
 206                                      &argp->first, cnt);
 207        if (!nvecs)
 208                RETURN_STATUS(nfserr_io);
 209        nfserr = nfsd_write(rqstp, &resp->fh, argp->offset,
 210                            rqstp->rq_vec, nvecs, &cnt,
 211                            resp->committed);
 212        resp->count = cnt;
 213        RETURN_STATUS(nfserr);
 214}
 215
 216/*
 217 * With NFSv3, CREATE processing is a lot easier than with NFSv2.
 218 * At least in theory; we'll see how it fares in practice when the
 219 * first reports about SunOS compatibility problems start to pour in...
 220 */
 221static __be32
 222nfsd3_proc_create(struct svc_rqst *rqstp)
 223{
 224        struct nfsd3_createargs *argp = rqstp->rq_argp;
 225        struct nfsd3_diropres *resp = rqstp->rq_resp;
 226        svc_fh          *dirfhp, *newfhp = NULL;
 227        struct iattr    *attr;
 228        __be32          nfserr;
 229
 230        dprintk("nfsd: CREATE(3)   %s %.*s\n",
 231                                SVCFH_fmt(&argp->fh),
 232                                argp->len,
 233                                argp->name);
 234
 235        dirfhp = fh_copy(&resp->dirfh, &argp->fh);
 236        newfhp = fh_init(&resp->fh, NFS3_FHSIZE);
 237        attr   = &argp->attrs;
 238
 239        /* Unfudge the mode bits */
 240        attr->ia_mode &= ~S_IFMT;
 241        if (!(attr->ia_valid & ATTR_MODE)) { 
 242                attr->ia_valid |= ATTR_MODE;
 243                attr->ia_mode = S_IFREG;
 244        } else {
 245                attr->ia_mode = (attr->ia_mode & ~S_IFMT) | S_IFREG;
 246        }
 247
 248        /* Now create the file and set attributes */
 249        nfserr = do_nfsd_create(rqstp, dirfhp, argp->name, argp->len,
 250                                attr, newfhp,
 251                                argp->createmode, (u32 *)argp->verf, NULL, NULL);
 252
 253        RETURN_STATUS(nfserr);
 254}
 255
 256/*
 257 * Make directory. This operation is not idempotent.
 258 */
 259static __be32
 260nfsd3_proc_mkdir(struct svc_rqst *rqstp)
 261{
 262        struct nfsd3_createargs *argp = rqstp->rq_argp;
 263        struct nfsd3_diropres *resp = rqstp->rq_resp;
 264        __be32  nfserr;
 265
 266        dprintk("nfsd: MKDIR(3)    %s %.*s\n",
 267                                SVCFH_fmt(&argp->fh),
 268                                argp->len,
 269                                argp->name);
 270
 271        argp->attrs.ia_valid &= ~ATTR_SIZE;
 272        fh_copy(&resp->dirfh, &argp->fh);
 273        fh_init(&resp->fh, NFS3_FHSIZE);
 274        nfserr = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
 275                                    &argp->attrs, S_IFDIR, 0, &resp->fh);
 276        fh_unlock(&resp->dirfh);
 277        RETURN_STATUS(nfserr);
 278}
 279
 280static __be32
 281nfsd3_proc_symlink(struct svc_rqst *rqstp)
 282{
 283        struct nfsd3_symlinkargs *argp = rqstp->rq_argp;
 284        struct nfsd3_diropres *resp = rqstp->rq_resp;
 285        __be32  nfserr;
 286
 287        if (argp->tlen == 0)
 288                RETURN_STATUS(nfserr_inval);
 289        if (argp->tlen > NFS3_MAXPATHLEN)
 290                RETURN_STATUS(nfserr_nametoolong);
 291
 292        argp->tname = svc_fill_symlink_pathname(rqstp, &argp->first,
 293                                                page_address(rqstp->rq_arg.pages[0]),
 294                                                argp->tlen);
 295        if (IS_ERR(argp->tname))
 296                RETURN_STATUS(nfserrno(PTR_ERR(argp->tname)));
 297
 298        dprintk("nfsd: SYMLINK(3)  %s %.*s -> %.*s\n",
 299                                SVCFH_fmt(&argp->ffh),
 300                                argp->flen, argp->fname,
 301                                argp->tlen, argp->tname);
 302
 303        fh_copy(&resp->dirfh, &argp->ffh);
 304        fh_init(&resp->fh, NFS3_FHSIZE);
 305        nfserr = nfsd_symlink(rqstp, &resp->dirfh, argp->fname, argp->flen,
 306                                                   argp->tname, &resp->fh);
 307        kfree(argp->tname);
 308        RETURN_STATUS(nfserr);
 309}
 310
 311/*
 312 * Make socket/fifo/device.
 313 */
 314static __be32
 315nfsd3_proc_mknod(struct svc_rqst *rqstp)
 316{
 317        struct nfsd3_mknodargs *argp = rqstp->rq_argp;
 318        struct nfsd3_diropres  *resp = rqstp->rq_resp;
 319        __be32  nfserr;
 320        int type;
 321        dev_t   rdev = 0;
 322
 323        dprintk("nfsd: MKNOD(3)    %s %.*s\n",
 324                                SVCFH_fmt(&argp->fh),
 325                                argp->len,
 326                                argp->name);
 327
 328        fh_copy(&resp->dirfh, &argp->fh);
 329        fh_init(&resp->fh, NFS3_FHSIZE);
 330
 331        if (argp->ftype == 0 || argp->ftype >= NF3BAD)
 332                RETURN_STATUS(nfserr_inval);
 333        if (argp->ftype == NF3CHR || argp->ftype == NF3BLK) {
 334                rdev = MKDEV(argp->major, argp->minor);
 335                if (MAJOR(rdev) != argp->major ||
 336                    MINOR(rdev) != argp->minor)
 337                        RETURN_STATUS(nfserr_inval);
 338        } else
 339                if (argp->ftype != NF3SOCK && argp->ftype != NF3FIFO)
 340                        RETURN_STATUS(nfserr_inval);
 341
 342        type = nfs3_ftypes[argp->ftype];
 343        nfserr = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
 344                                    &argp->attrs, type, rdev, &resp->fh);
 345        fh_unlock(&resp->dirfh);
 346        RETURN_STATUS(nfserr);
 347}
 348
 349/*
 350 * Remove file/fifo/socket etc.
 351 */
 352static __be32
 353nfsd3_proc_remove(struct svc_rqst *rqstp)
 354{
 355        struct nfsd3_diropargs *argp = rqstp->rq_argp;
 356        struct nfsd3_attrstat *resp = rqstp->rq_resp;
 357        __be32  nfserr;
 358
 359        dprintk("nfsd: REMOVE(3)   %s %.*s\n",
 360                                SVCFH_fmt(&argp->fh),
 361                                argp->len,
 362                                argp->name);
 363
 364        /* Unlink. -S_IFDIR means file must not be a directory */
 365        fh_copy(&resp->fh, &argp->fh);
 366        nfserr = nfsd_unlink(rqstp, &resp->fh, -S_IFDIR, argp->name, argp->len);
 367        fh_unlock(&resp->fh);
 368        RETURN_STATUS(nfserr);
 369}
 370
 371/*
 372 * Remove a directory
 373 */
 374static __be32
 375nfsd3_proc_rmdir(struct svc_rqst *rqstp)
 376{
 377        struct nfsd3_diropargs *argp = rqstp->rq_argp;
 378        struct nfsd3_attrstat *resp = rqstp->rq_resp;
 379        __be32  nfserr;
 380
 381        dprintk("nfsd: RMDIR(3)    %s %.*s\n",
 382                                SVCFH_fmt(&argp->fh),
 383                                argp->len,
 384                                argp->name);
 385
 386        fh_copy(&resp->fh, &argp->fh);
 387        nfserr = nfsd_unlink(rqstp, &resp->fh, S_IFDIR, argp->name, argp->len);
 388        fh_unlock(&resp->fh);
 389        RETURN_STATUS(nfserr);
 390}
 391
 392static __be32
 393nfsd3_proc_rename(struct svc_rqst *rqstp)
 394{
 395        struct nfsd3_renameargs *argp = rqstp->rq_argp;
 396        struct nfsd3_renameres *resp = rqstp->rq_resp;
 397        __be32  nfserr;
 398
 399        dprintk("nfsd: RENAME(3)   %s %.*s ->\n",
 400                                SVCFH_fmt(&argp->ffh),
 401                                argp->flen,
 402                                argp->fname);
 403        dprintk("nfsd: -> %s %.*s\n",
 404                                SVCFH_fmt(&argp->tfh),
 405                                argp->tlen,
 406                                argp->tname);
 407
 408        fh_copy(&resp->ffh, &argp->ffh);
 409        fh_copy(&resp->tfh, &argp->tfh);
 410        nfserr = nfsd_rename(rqstp, &resp->ffh, argp->fname, argp->flen,
 411                                    &resp->tfh, argp->tname, argp->tlen);
 412        RETURN_STATUS(nfserr);
 413}
 414
 415static __be32
 416nfsd3_proc_link(struct svc_rqst *rqstp)
 417{
 418        struct nfsd3_linkargs *argp = rqstp->rq_argp;
 419        struct nfsd3_linkres  *resp = rqstp->rq_resp;
 420        __be32  nfserr;
 421
 422        dprintk("nfsd: LINK(3)     %s ->\n",
 423                                SVCFH_fmt(&argp->ffh));
 424        dprintk("nfsd:   -> %s %.*s\n",
 425                                SVCFH_fmt(&argp->tfh),
 426                                argp->tlen,
 427                                argp->tname);
 428
 429        fh_copy(&resp->fh,  &argp->ffh);
 430        fh_copy(&resp->tfh, &argp->tfh);
 431        nfserr = nfsd_link(rqstp, &resp->tfh, argp->tname, argp->tlen,
 432                                  &resp->fh);
 433        RETURN_STATUS(nfserr);
 434}
 435
 436/*
 437 * Read a portion of a directory.
 438 */
 439static __be32
 440nfsd3_proc_readdir(struct svc_rqst *rqstp)
 441{
 442        struct nfsd3_readdirargs *argp = rqstp->rq_argp;
 443        struct nfsd3_readdirres  *resp = rqstp->rq_resp;
 444        __be32          nfserr;
 445        int             count = 0;
 446        struct page     **p;
 447        caddr_t         page_addr = NULL;
 448
 449        dprintk("nfsd: READDIR(3)  %s %d bytes at %d\n",
 450                                SVCFH_fmt(&argp->fh),
 451                                argp->count, (u32) argp->cookie);
 452
 453        /* Make sure we've room for the NULL ptr & eof flag, and shrink to
 454         * client read size */
 455        count = (argp->count >> 2) - 2;
 456
 457        /* Read directory and encode entries on the fly */
 458        fh_copy(&resp->fh, &argp->fh);
 459
 460        resp->buflen = count;
 461        resp->common.err = nfs_ok;
 462        resp->buffer = argp->buffer;
 463        resp->rqstp = rqstp;
 464        nfserr = nfsd_readdir(rqstp, &resp->fh, (loff_t*) &argp->cookie, 
 465                                        &resp->common, nfs3svc_encode_entry);
 466        memcpy(resp->verf, argp->verf, 8);
 467        count = 0;
 468        for (p = rqstp->rq_respages + 1; p < rqstp->rq_next_page; p++) {
 469                page_addr = page_address(*p);
 470
 471                if (((caddr_t)resp->buffer >= page_addr) &&
 472                    ((caddr_t)resp->buffer < page_addr + PAGE_SIZE)) {
 473                        count += (caddr_t)resp->buffer - page_addr;
 474                        break;
 475                }
 476                count += PAGE_SIZE;
 477        }
 478        resp->count = count >> 2;
 479        if (resp->offset) {
 480                loff_t offset = argp->cookie;
 481
 482                if (unlikely(resp->offset1)) {
 483                        /* we ended up with offset on a page boundary */
 484                        *resp->offset = htonl(offset >> 32);
 485                        *resp->offset1 = htonl(offset & 0xffffffff);
 486                        resp->offset1 = NULL;
 487                } else {
 488                        xdr_encode_hyper(resp->offset, offset);
 489                }
 490                resp->offset = NULL;
 491        }
 492
 493        RETURN_STATUS(nfserr);
 494}
 495
 496/*
 497 * Read a portion of a directory, including file handles and attrs.
 498 * For now, we choose to ignore the dircount parameter.
 499 */
 500static __be32
 501nfsd3_proc_readdirplus(struct svc_rqst *rqstp)
 502{
 503        struct nfsd3_readdirargs *argp = rqstp->rq_argp;
 504        struct nfsd3_readdirres  *resp = rqstp->rq_resp;
 505        __be32  nfserr;
 506        int     count = 0;
 507        loff_t  offset;
 508        struct page **p;
 509        caddr_t page_addr = NULL;
 510
 511        dprintk("nfsd: READDIR+(3) %s %d bytes at %d\n",
 512                                SVCFH_fmt(&argp->fh),
 513                                argp->count, (u32) argp->cookie);
 514
 515        /* Convert byte count to number of words (i.e. >> 2),
 516         * and reserve room for the NULL ptr & eof flag (-2 words) */
 517        resp->count = (argp->count >> 2) - 2;
 518
 519        /* Read directory and encode entries on the fly */
 520        fh_copy(&resp->fh, &argp->fh);
 521
 522        resp->common.err = nfs_ok;
 523        resp->buffer = argp->buffer;
 524        resp->buflen = resp->count;
 525        resp->rqstp = rqstp;
 526        offset = argp->cookie;
 527
 528        nfserr = fh_verify(rqstp, &resp->fh, S_IFDIR, NFSD_MAY_NOP);
 529        if (nfserr)
 530                RETURN_STATUS(nfserr);
 531
 532        if (resp->fh.fh_export->ex_flags & NFSEXP_NOREADDIRPLUS)
 533                RETURN_STATUS(nfserr_notsupp);
 534
 535        nfserr = nfsd_readdir(rqstp, &resp->fh,
 536                                     &offset,
 537                                     &resp->common,
 538                                     nfs3svc_encode_entry_plus);
 539        memcpy(resp->verf, argp->verf, 8);
 540        for (p = rqstp->rq_respages + 1; p < rqstp->rq_next_page; p++) {
 541                page_addr = page_address(*p);
 542
 543                if (((caddr_t)resp->buffer >= page_addr) &&
 544                    ((caddr_t)resp->buffer < page_addr + PAGE_SIZE)) {
 545                        count += (caddr_t)resp->buffer - page_addr;
 546                        break;
 547                }
 548                count += PAGE_SIZE;
 549        }
 550        resp->count = count >> 2;
 551        if (resp->offset) {
 552                if (unlikely(resp->offset1)) {
 553                        /* we ended up with offset on a page boundary */
 554                        *resp->offset = htonl(offset >> 32);
 555                        *resp->offset1 = htonl(offset & 0xffffffff);
 556                        resp->offset1 = NULL;
 557                } else {
 558                        xdr_encode_hyper(resp->offset, offset);
 559                }
 560                resp->offset = NULL;
 561        }
 562
 563        RETURN_STATUS(nfserr);
 564}
 565
 566/*
 567 * Get file system stats
 568 */
 569static __be32
 570nfsd3_proc_fsstat(struct svc_rqst *rqstp)
 571{
 572        struct nfsd_fhandle *argp = rqstp->rq_argp;
 573        struct nfsd3_fsstatres *resp = rqstp->rq_resp;
 574        __be32  nfserr;
 575
 576        dprintk("nfsd: FSSTAT(3)   %s\n",
 577                                SVCFH_fmt(&argp->fh));
 578
 579        nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats, 0);
 580        fh_put(&argp->fh);
 581        RETURN_STATUS(nfserr);
 582}
 583
 584/*
 585 * Get file system info
 586 */
 587static __be32
 588nfsd3_proc_fsinfo(struct svc_rqst *rqstp)
 589{
 590        struct nfsd_fhandle *argp = rqstp->rq_argp;
 591        struct nfsd3_fsinfores *resp = rqstp->rq_resp;
 592        __be32  nfserr;
 593        u32     max_blocksize = svc_max_payload(rqstp);
 594
 595        dprintk("nfsd: FSINFO(3)   %s\n",
 596                                SVCFH_fmt(&argp->fh));
 597
 598        resp->f_rtmax  = max_blocksize;
 599        resp->f_rtpref = max_blocksize;
 600        resp->f_rtmult = PAGE_SIZE;
 601        resp->f_wtmax  = max_blocksize;
 602        resp->f_wtpref = max_blocksize;
 603        resp->f_wtmult = PAGE_SIZE;
 604        resp->f_dtpref = max_blocksize;
 605        resp->f_maxfilesize = ~(u32) 0;
 606        resp->f_properties = NFS3_FSF_DEFAULT;
 607
 608        nfserr = fh_verify(rqstp, &argp->fh, 0,
 609                        NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
 610
 611        /* Check special features of the file system. May request
 612         * different read/write sizes for file systems known to have
 613         * problems with large blocks */
 614        if (nfserr == 0) {
 615                struct super_block *sb = argp->fh.fh_dentry->d_sb;
 616
 617                /* Note that we don't care for remote fs's here */
 618                if (sb->s_magic == MSDOS_SUPER_MAGIC) {
 619                        resp->f_properties = NFS3_FSF_BILLYBOY;
 620                }
 621                resp->f_maxfilesize = sb->s_maxbytes;
 622        }
 623
 624        fh_put(&argp->fh);
 625        RETURN_STATUS(nfserr);
 626}
 627
 628/*
 629 * Get pathconf info for the specified file
 630 */
 631static __be32
 632nfsd3_proc_pathconf(struct svc_rqst *rqstp)
 633{
 634        struct nfsd_fhandle *argp = rqstp->rq_argp;
 635        struct nfsd3_pathconfres *resp = rqstp->rq_resp;
 636        __be32  nfserr;
 637
 638        dprintk("nfsd: PATHCONF(3) %s\n",
 639                                SVCFH_fmt(&argp->fh));
 640
 641        /* Set default pathconf */
 642        resp->p_link_max = 255;         /* at least */
 643        resp->p_name_max = 255;         /* at least */
 644        resp->p_no_trunc = 0;
 645        resp->p_chown_restricted = 1;
 646        resp->p_case_insensitive = 0;
 647        resp->p_case_preserving = 1;
 648
 649        nfserr = fh_verify(rqstp, &argp->fh, 0, NFSD_MAY_NOP);
 650
 651        if (nfserr == 0) {
 652                struct super_block *sb = argp->fh.fh_dentry->d_sb;
 653
 654                /* Note that we don't care for remote fs's here */
 655                switch (sb->s_magic) {
 656                case EXT2_SUPER_MAGIC:
 657                        resp->p_link_max = EXT2_LINK_MAX;
 658                        resp->p_name_max = EXT2_NAME_LEN;
 659                        break;
 660                case MSDOS_SUPER_MAGIC:
 661                        resp->p_case_insensitive = 1;
 662                        resp->p_case_preserving  = 0;
 663                        break;
 664                }
 665        }
 666
 667        fh_put(&argp->fh);
 668        RETURN_STATUS(nfserr);
 669}
 670
 671
 672/*
 673 * Commit a file (range) to stable storage.
 674 */
 675static __be32
 676nfsd3_proc_commit(struct svc_rqst *rqstp)
 677{
 678        struct nfsd3_commitargs *argp = rqstp->rq_argp;
 679        struct nfsd3_commitres *resp = rqstp->rq_resp;
 680        __be32  nfserr;
 681
 682        dprintk("nfsd: COMMIT(3)   %s %u@%Lu\n",
 683                                SVCFH_fmt(&argp->fh),
 684                                argp->count,
 685                                (unsigned long long) argp->offset);
 686
 687        if (argp->offset > NFS_OFFSET_MAX)
 688                RETURN_STATUS(nfserr_inval);
 689
 690        fh_copy(&resp->fh, &argp->fh);
 691        nfserr = nfsd_commit(rqstp, &resp->fh, argp->offset, argp->count);
 692
 693        RETURN_STATUS(nfserr);
 694}
 695
 696
 697/*
 698 * NFSv3 Server procedures.
 699 * Only the results of non-idempotent operations are cached.
 700 */
 701#define nfs3svc_decode_fhandleargs      nfs3svc_decode_fhandle
 702#define nfs3svc_encode_attrstatres      nfs3svc_encode_attrstat
 703#define nfs3svc_encode_wccstatres       nfs3svc_encode_wccstat
 704#define nfsd3_mkdirargs                 nfsd3_createargs
 705#define nfsd3_readdirplusargs           nfsd3_readdirargs
 706#define nfsd3_fhandleargs               nfsd_fhandle
 707#define nfsd3_fhandleres                nfsd3_attrstat
 708#define nfsd3_attrstatres               nfsd3_attrstat
 709#define nfsd3_wccstatres                nfsd3_attrstat
 710#define nfsd3_createres                 nfsd3_diropres
 711#define nfsd3_voidres                   nfsd3_voidargs
 712struct nfsd3_voidargs { int dummy; };
 713
 714#define ST 1            /* status*/
 715#define FH 17           /* filehandle with length */
 716#define AT 21           /* attributes */
 717#define pAT (1+AT)      /* post attributes - conditional */
 718#define WC (7+pAT)      /* WCC attributes */
 719
 720static const struct svc_procedure nfsd_procedures3[22] = {
 721        [NFS3PROC_NULL] = {
 722                .pc_func = nfsd3_proc_null,
 723                .pc_encode = nfs3svc_encode_voidres,
 724                .pc_argsize = sizeof(struct nfsd3_voidargs),
 725                .pc_ressize = sizeof(struct nfsd3_voidres),
 726                .pc_cachetype = RC_NOCACHE,
 727                .pc_xdrressize = ST,
 728        },
 729        [NFS3PROC_GETATTR] = {
 730                .pc_func = nfsd3_proc_getattr,
 731                .pc_decode = nfs3svc_decode_fhandleargs,
 732                .pc_encode = nfs3svc_encode_attrstatres,
 733                .pc_release = nfs3svc_release_fhandle,
 734                .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 735                .pc_ressize = sizeof(struct nfsd3_attrstatres),
 736                .pc_cachetype = RC_NOCACHE,
 737                .pc_xdrressize = ST+AT,
 738        },
 739        [NFS3PROC_SETATTR] = {
 740                .pc_func = nfsd3_proc_setattr,
 741                .pc_decode = nfs3svc_decode_sattrargs,
 742                .pc_encode = nfs3svc_encode_wccstatres,
 743                .pc_release = nfs3svc_release_fhandle,
 744                .pc_argsize = sizeof(struct nfsd3_sattrargs),
 745                .pc_ressize = sizeof(struct nfsd3_wccstatres),
 746                .pc_cachetype = RC_REPLBUFF,
 747                .pc_xdrressize = ST+WC,
 748        },
 749        [NFS3PROC_LOOKUP] = {
 750                .pc_func = nfsd3_proc_lookup,
 751                .pc_decode = nfs3svc_decode_diropargs,
 752                .pc_encode = nfs3svc_encode_diropres,
 753                .pc_release = nfs3svc_release_fhandle2,
 754                .pc_argsize = sizeof(struct nfsd3_diropargs),
 755                .pc_ressize = sizeof(struct nfsd3_diropres),
 756                .pc_cachetype = RC_NOCACHE,
 757                .pc_xdrressize = ST+FH+pAT+pAT,
 758        },
 759        [NFS3PROC_ACCESS] = {
 760                .pc_func = nfsd3_proc_access,
 761                .pc_decode = nfs3svc_decode_accessargs,
 762                .pc_encode = nfs3svc_encode_accessres,
 763                .pc_release = nfs3svc_release_fhandle,
 764                .pc_argsize = sizeof(struct nfsd3_accessargs),
 765                .pc_ressize = sizeof(struct nfsd3_accessres),
 766                .pc_cachetype = RC_NOCACHE,
 767                .pc_xdrressize = ST+pAT+1,
 768        },
 769        [NFS3PROC_READLINK] = {
 770                .pc_func = nfsd3_proc_readlink,
 771                .pc_decode = nfs3svc_decode_readlinkargs,
 772                .pc_encode = nfs3svc_encode_readlinkres,
 773                .pc_release = nfs3svc_release_fhandle,
 774                .pc_argsize = sizeof(struct nfsd3_readlinkargs),
 775                .pc_ressize = sizeof(struct nfsd3_readlinkres),
 776                .pc_cachetype = RC_NOCACHE,
 777                .pc_xdrressize = ST+pAT+1+NFS3_MAXPATHLEN/4,
 778        },
 779        [NFS3PROC_READ] = {
 780                .pc_func = nfsd3_proc_read,
 781                .pc_decode = nfs3svc_decode_readargs,
 782                .pc_encode = nfs3svc_encode_readres,
 783                .pc_release = nfs3svc_release_fhandle,
 784                .pc_argsize = sizeof(struct nfsd3_readargs),
 785                .pc_ressize = sizeof(struct nfsd3_readres),
 786                .pc_cachetype = RC_NOCACHE,
 787                .pc_xdrressize = ST+pAT+4+NFSSVC_MAXBLKSIZE/4,
 788        },
 789        [NFS3PROC_WRITE] = {
 790                .pc_func = nfsd3_proc_write,
 791                .pc_decode = nfs3svc_decode_writeargs,
 792                .pc_encode = nfs3svc_encode_writeres,
 793                .pc_release = nfs3svc_release_fhandle,
 794                .pc_argsize = sizeof(struct nfsd3_writeargs),
 795                .pc_ressize = sizeof(struct nfsd3_writeres),
 796                .pc_cachetype = RC_REPLBUFF,
 797                .pc_xdrressize = ST+WC+4,
 798        },
 799        [NFS3PROC_CREATE] = {
 800                .pc_func = nfsd3_proc_create,
 801                .pc_decode = nfs3svc_decode_createargs,
 802                .pc_encode = nfs3svc_encode_createres,
 803                .pc_release = nfs3svc_release_fhandle2,
 804                .pc_argsize = sizeof(struct nfsd3_createargs),
 805                .pc_ressize = sizeof(struct nfsd3_createres),
 806                .pc_cachetype = RC_REPLBUFF,
 807                .pc_xdrressize = ST+(1+FH+pAT)+WC,
 808        },
 809        [NFS3PROC_MKDIR] = {
 810                .pc_func = nfsd3_proc_mkdir,
 811                .pc_decode = nfs3svc_decode_mkdirargs,
 812                .pc_encode = nfs3svc_encode_createres,
 813                .pc_release = nfs3svc_release_fhandle2,
 814                .pc_argsize = sizeof(struct nfsd3_mkdirargs),
 815                .pc_ressize = sizeof(struct nfsd3_createres),
 816                .pc_cachetype = RC_REPLBUFF,
 817                .pc_xdrressize = ST+(1+FH+pAT)+WC,
 818        },
 819        [NFS3PROC_SYMLINK] = {
 820                .pc_func = nfsd3_proc_symlink,
 821                .pc_decode = nfs3svc_decode_symlinkargs,
 822                .pc_encode = nfs3svc_encode_createres,
 823                .pc_release = nfs3svc_release_fhandle2,
 824                .pc_argsize = sizeof(struct nfsd3_symlinkargs),
 825                .pc_ressize = sizeof(struct nfsd3_createres),
 826                .pc_cachetype = RC_REPLBUFF,
 827                .pc_xdrressize = ST+(1+FH+pAT)+WC,
 828        },
 829        [NFS3PROC_MKNOD] = {
 830                .pc_func = nfsd3_proc_mknod,
 831                .pc_decode = nfs3svc_decode_mknodargs,
 832                .pc_encode = nfs3svc_encode_createres,
 833                .pc_release = nfs3svc_release_fhandle2,
 834                .pc_argsize = sizeof(struct nfsd3_mknodargs),
 835                .pc_ressize = sizeof(struct nfsd3_createres),
 836                .pc_cachetype = RC_REPLBUFF,
 837                .pc_xdrressize = ST+(1+FH+pAT)+WC,
 838        },
 839        [NFS3PROC_REMOVE] = {
 840                .pc_func = nfsd3_proc_remove,
 841                .pc_decode = nfs3svc_decode_diropargs,
 842                .pc_encode = nfs3svc_encode_wccstatres,
 843                .pc_release = nfs3svc_release_fhandle,
 844                .pc_argsize = sizeof(struct nfsd3_diropargs),
 845                .pc_ressize = sizeof(struct nfsd3_wccstatres),
 846                .pc_cachetype = RC_REPLBUFF,
 847                .pc_xdrressize = ST+WC,
 848        },
 849        [NFS3PROC_RMDIR] = {
 850                .pc_func = nfsd3_proc_rmdir,
 851                .pc_decode = nfs3svc_decode_diropargs,
 852                .pc_encode = nfs3svc_encode_wccstatres,
 853                .pc_release = nfs3svc_release_fhandle,
 854                .pc_argsize = sizeof(struct nfsd3_diropargs),
 855                .pc_ressize = sizeof(struct nfsd3_wccstatres),
 856                .pc_cachetype = RC_REPLBUFF,
 857                .pc_xdrressize = ST+WC,
 858        },
 859        [NFS3PROC_RENAME] = {
 860                .pc_func = nfsd3_proc_rename,
 861                .pc_decode = nfs3svc_decode_renameargs,
 862                .pc_encode = nfs3svc_encode_renameres,
 863                .pc_release = nfs3svc_release_fhandle2,
 864                .pc_argsize = sizeof(struct nfsd3_renameargs),
 865                .pc_ressize = sizeof(struct nfsd3_renameres),
 866                .pc_cachetype = RC_REPLBUFF,
 867                .pc_xdrressize = ST+WC+WC,
 868        },
 869        [NFS3PROC_LINK] = {
 870                .pc_func = nfsd3_proc_link,
 871                .pc_decode = nfs3svc_decode_linkargs,
 872                .pc_encode = nfs3svc_encode_linkres,
 873                .pc_release = nfs3svc_release_fhandle2,
 874                .pc_argsize = sizeof(struct nfsd3_linkargs),
 875                .pc_ressize = sizeof(struct nfsd3_linkres),
 876                .pc_cachetype = RC_REPLBUFF,
 877                .pc_xdrressize = ST+pAT+WC,
 878        },
 879        [NFS3PROC_READDIR] = {
 880                .pc_func = nfsd3_proc_readdir,
 881                .pc_decode = nfs3svc_decode_readdirargs,
 882                .pc_encode = nfs3svc_encode_readdirres,
 883                .pc_release = nfs3svc_release_fhandle,
 884                .pc_argsize = sizeof(struct nfsd3_readdirargs),
 885                .pc_ressize = sizeof(struct nfsd3_readdirres),
 886                .pc_cachetype = RC_NOCACHE,
 887        },
 888        [NFS3PROC_READDIRPLUS] = {
 889                .pc_func = nfsd3_proc_readdirplus,
 890                .pc_decode = nfs3svc_decode_readdirplusargs,
 891                .pc_encode = nfs3svc_encode_readdirres,
 892                .pc_release = nfs3svc_release_fhandle,
 893                .pc_argsize = sizeof(struct nfsd3_readdirplusargs),
 894                .pc_ressize = sizeof(struct nfsd3_readdirres),
 895                .pc_cachetype = RC_NOCACHE,
 896        },
 897        [NFS3PROC_FSSTAT] = {
 898                .pc_func = nfsd3_proc_fsstat,
 899                .pc_decode = nfs3svc_decode_fhandleargs,
 900                .pc_encode = nfs3svc_encode_fsstatres,
 901                .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 902                .pc_ressize = sizeof(struct nfsd3_fsstatres),
 903                .pc_cachetype = RC_NOCACHE,
 904                .pc_xdrressize = ST+pAT+2*6+1,
 905        },
 906        [NFS3PROC_FSINFO] = {
 907                .pc_func = nfsd3_proc_fsinfo,
 908                .pc_decode = nfs3svc_decode_fhandleargs,
 909                .pc_encode = nfs3svc_encode_fsinfores,
 910                .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 911                .pc_ressize = sizeof(struct nfsd3_fsinfores),
 912                .pc_cachetype = RC_NOCACHE,
 913                .pc_xdrressize = ST+pAT+12,
 914        },
 915        [NFS3PROC_PATHCONF] = {
 916                .pc_func = nfsd3_proc_pathconf,
 917                .pc_decode = nfs3svc_decode_fhandleargs,
 918                .pc_encode = nfs3svc_encode_pathconfres,
 919                .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 920                .pc_ressize = sizeof(struct nfsd3_pathconfres),
 921                .pc_cachetype = RC_NOCACHE,
 922                .pc_xdrressize = ST+pAT+6,
 923        },
 924        [NFS3PROC_COMMIT] = {
 925                .pc_func = nfsd3_proc_commit,
 926                .pc_decode = nfs3svc_decode_commitargs,
 927                .pc_encode = nfs3svc_encode_commitres,
 928                .pc_release = nfs3svc_release_fhandle,
 929                .pc_argsize = sizeof(struct nfsd3_commitargs),
 930                .pc_ressize = sizeof(struct nfsd3_commitres),
 931                .pc_cachetype = RC_NOCACHE,
 932                .pc_xdrressize = ST+WC+2,
 933        },
 934};
 935
 936static unsigned int nfsd_count3[ARRAY_SIZE(nfsd_procedures3)];
 937const struct svc_version nfsd_version3 = {
 938        .vs_vers        = 3,
 939        .vs_nproc       = 22,
 940        .vs_proc        = nfsd_procedures3,
 941        .vs_dispatch    = nfsd_dispatch,
 942        .vs_count       = nfsd_count3,
 943        .vs_xdrsize     = NFS3_SVC_XDRSIZE,
 944};
 945