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
 196        dprintk("nfsd: WRITE(3)    %s %d bytes at %Lu%s\n",
 197                                SVCFH_fmt(&argp->fh),
 198                                argp->len,
 199                                (unsigned long long) argp->offset,
 200                                argp->stable? " stable" : "");
 201
 202        fh_copy(&resp->fh, &argp->fh);
 203        resp->committed = argp->stable;
 204        nfserr = nfsd_write(rqstp, &resp->fh, argp->offset,
 205                                rqstp->rq_vec, argp->vlen,
 206                                &cnt, resp->committed);
 207        resp->count = cnt;
 208        RETURN_STATUS(nfserr);
 209}
 210
 211/*
 212 * With NFSv3, CREATE processing is a lot easier than with NFSv2.
 213 * At least in theory; we'll see how it fares in practice when the
 214 * first reports about SunOS compatibility problems start to pour in...
 215 */
 216static __be32
 217nfsd3_proc_create(struct svc_rqst *rqstp)
 218{
 219        struct nfsd3_createargs *argp = rqstp->rq_argp;
 220        struct nfsd3_diropres *resp = rqstp->rq_resp;
 221        svc_fh          *dirfhp, *newfhp = NULL;
 222        struct iattr    *attr;
 223        __be32          nfserr;
 224
 225        dprintk("nfsd: CREATE(3)   %s %.*s\n",
 226                                SVCFH_fmt(&argp->fh),
 227                                argp->len,
 228                                argp->name);
 229
 230        dirfhp = fh_copy(&resp->dirfh, &argp->fh);
 231        newfhp = fh_init(&resp->fh, NFS3_FHSIZE);
 232        attr   = &argp->attrs;
 233
 234        /* Unfudge the mode bits */
 235        attr->ia_mode &= ~S_IFMT;
 236        if (!(attr->ia_valid & ATTR_MODE)) { 
 237                attr->ia_valid |= ATTR_MODE;
 238                attr->ia_mode = S_IFREG;
 239        } else {
 240                attr->ia_mode = (attr->ia_mode & ~S_IFMT) | S_IFREG;
 241        }
 242
 243        /* Now create the file and set attributes */
 244        nfserr = do_nfsd_create(rqstp, dirfhp, argp->name, argp->len,
 245                                attr, newfhp,
 246                                argp->createmode, (u32 *)argp->verf, NULL, NULL);
 247
 248        RETURN_STATUS(nfserr);
 249}
 250
 251/*
 252 * Make directory. This operation is not idempotent.
 253 */
 254static __be32
 255nfsd3_proc_mkdir(struct svc_rqst *rqstp)
 256{
 257        struct nfsd3_createargs *argp = rqstp->rq_argp;
 258        struct nfsd3_diropres *resp = rqstp->rq_resp;
 259        __be32  nfserr;
 260
 261        dprintk("nfsd: MKDIR(3)    %s %.*s\n",
 262                                SVCFH_fmt(&argp->fh),
 263                                argp->len,
 264                                argp->name);
 265
 266        argp->attrs.ia_valid &= ~ATTR_SIZE;
 267        fh_copy(&resp->dirfh, &argp->fh);
 268        fh_init(&resp->fh, NFS3_FHSIZE);
 269        nfserr = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
 270                                    &argp->attrs, S_IFDIR, 0, &resp->fh);
 271        fh_unlock(&resp->dirfh);
 272        RETURN_STATUS(nfserr);
 273}
 274
 275static __be32
 276nfsd3_proc_symlink(struct svc_rqst *rqstp)
 277{
 278        struct nfsd3_symlinkargs *argp = rqstp->rq_argp;
 279        struct nfsd3_diropres *resp = rqstp->rq_resp;
 280        __be32  nfserr;
 281
 282        dprintk("nfsd: SYMLINK(3)  %s %.*s -> %.*s\n",
 283                                SVCFH_fmt(&argp->ffh),
 284                                argp->flen, argp->fname,
 285                                argp->tlen, argp->tname);
 286
 287        fh_copy(&resp->dirfh, &argp->ffh);
 288        fh_init(&resp->fh, NFS3_FHSIZE);
 289        nfserr = nfsd_symlink(rqstp, &resp->dirfh, argp->fname, argp->flen,
 290                                                   argp->tname, &resp->fh);
 291        RETURN_STATUS(nfserr);
 292}
 293
 294/*
 295 * Make socket/fifo/device.
 296 */
 297static __be32
 298nfsd3_proc_mknod(struct svc_rqst *rqstp)
 299{
 300        struct nfsd3_mknodargs *argp = rqstp->rq_argp;
 301        struct nfsd3_diropres  *resp = rqstp->rq_resp;
 302        __be32  nfserr;
 303        int type;
 304        dev_t   rdev = 0;
 305
 306        dprintk("nfsd: MKNOD(3)    %s %.*s\n",
 307                                SVCFH_fmt(&argp->fh),
 308                                argp->len,
 309                                argp->name);
 310
 311        fh_copy(&resp->dirfh, &argp->fh);
 312        fh_init(&resp->fh, NFS3_FHSIZE);
 313
 314        if (argp->ftype == 0 || argp->ftype >= NF3BAD)
 315                RETURN_STATUS(nfserr_inval);
 316        if (argp->ftype == NF3CHR || argp->ftype == NF3BLK) {
 317                rdev = MKDEV(argp->major, argp->minor);
 318                if (MAJOR(rdev) != argp->major ||
 319                    MINOR(rdev) != argp->minor)
 320                        RETURN_STATUS(nfserr_inval);
 321        } else
 322                if (argp->ftype != NF3SOCK && argp->ftype != NF3FIFO)
 323                        RETURN_STATUS(nfserr_inval);
 324
 325        type = nfs3_ftypes[argp->ftype];
 326        nfserr = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
 327                                    &argp->attrs, type, rdev, &resp->fh);
 328        fh_unlock(&resp->dirfh);
 329        RETURN_STATUS(nfserr);
 330}
 331
 332/*
 333 * Remove file/fifo/socket etc.
 334 */
 335static __be32
 336nfsd3_proc_remove(struct svc_rqst *rqstp)
 337{
 338        struct nfsd3_diropargs *argp = rqstp->rq_argp;
 339        struct nfsd3_attrstat *resp = rqstp->rq_resp;
 340        __be32  nfserr;
 341
 342        dprintk("nfsd: REMOVE(3)   %s %.*s\n",
 343                                SVCFH_fmt(&argp->fh),
 344                                argp->len,
 345                                argp->name);
 346
 347        /* Unlink. -S_IFDIR means file must not be a directory */
 348        fh_copy(&resp->fh, &argp->fh);
 349        nfserr = nfsd_unlink(rqstp, &resp->fh, -S_IFDIR, argp->name, argp->len);
 350        fh_unlock(&resp->fh);
 351        RETURN_STATUS(nfserr);
 352}
 353
 354/*
 355 * Remove a directory
 356 */
 357static __be32
 358nfsd3_proc_rmdir(struct svc_rqst *rqstp)
 359{
 360        struct nfsd3_diropargs *argp = rqstp->rq_argp;
 361        struct nfsd3_attrstat *resp = rqstp->rq_resp;
 362        __be32  nfserr;
 363
 364        dprintk("nfsd: RMDIR(3)    %s %.*s\n",
 365                                SVCFH_fmt(&argp->fh),
 366                                argp->len,
 367                                argp->name);
 368
 369        fh_copy(&resp->fh, &argp->fh);
 370        nfserr = nfsd_unlink(rqstp, &resp->fh, S_IFDIR, argp->name, argp->len);
 371        fh_unlock(&resp->fh);
 372        RETURN_STATUS(nfserr);
 373}
 374
 375static __be32
 376nfsd3_proc_rename(struct svc_rqst *rqstp)
 377{
 378        struct nfsd3_renameargs *argp = rqstp->rq_argp;
 379        struct nfsd3_renameres *resp = rqstp->rq_resp;
 380        __be32  nfserr;
 381
 382        dprintk("nfsd: RENAME(3)   %s %.*s ->\n",
 383                                SVCFH_fmt(&argp->ffh),
 384                                argp->flen,
 385                                argp->fname);
 386        dprintk("nfsd: -> %s %.*s\n",
 387                                SVCFH_fmt(&argp->tfh),
 388                                argp->tlen,
 389                                argp->tname);
 390
 391        fh_copy(&resp->ffh, &argp->ffh);
 392        fh_copy(&resp->tfh, &argp->tfh);
 393        nfserr = nfsd_rename(rqstp, &resp->ffh, argp->fname, argp->flen,
 394                                    &resp->tfh, argp->tname, argp->tlen);
 395        RETURN_STATUS(nfserr);
 396}
 397
 398static __be32
 399nfsd3_proc_link(struct svc_rqst *rqstp)
 400{
 401        struct nfsd3_linkargs *argp = rqstp->rq_argp;
 402        struct nfsd3_linkres  *resp = rqstp->rq_resp;
 403        __be32  nfserr;
 404
 405        dprintk("nfsd: LINK(3)     %s ->\n",
 406                                SVCFH_fmt(&argp->ffh));
 407        dprintk("nfsd:   -> %s %.*s\n",
 408                                SVCFH_fmt(&argp->tfh),
 409                                argp->tlen,
 410                                argp->tname);
 411
 412        fh_copy(&resp->fh,  &argp->ffh);
 413        fh_copy(&resp->tfh, &argp->tfh);
 414        nfserr = nfsd_link(rqstp, &resp->tfh, argp->tname, argp->tlen,
 415                                  &resp->fh);
 416        RETURN_STATUS(nfserr);
 417}
 418
 419/*
 420 * Read a portion of a directory.
 421 */
 422static __be32
 423nfsd3_proc_readdir(struct svc_rqst *rqstp)
 424{
 425        struct nfsd3_readdirargs *argp = rqstp->rq_argp;
 426        struct nfsd3_readdirres  *resp = rqstp->rq_resp;
 427        __be32          nfserr;
 428        int             count;
 429
 430        dprintk("nfsd: READDIR(3)  %s %d bytes at %d\n",
 431                                SVCFH_fmt(&argp->fh),
 432                                argp->count, (u32) argp->cookie);
 433
 434        /* Make sure we've room for the NULL ptr & eof flag, and shrink to
 435         * client read size */
 436        count = (argp->count >> 2) - 2;
 437
 438        /* Read directory and encode entries on the fly */
 439        fh_copy(&resp->fh, &argp->fh);
 440
 441        resp->buflen = count;
 442        resp->common.err = nfs_ok;
 443        resp->buffer = argp->buffer;
 444        resp->rqstp = rqstp;
 445        nfserr = nfsd_readdir(rqstp, &resp->fh, (loff_t*) &argp->cookie, 
 446                                        &resp->common, nfs3svc_encode_entry);
 447        memcpy(resp->verf, argp->verf, 8);
 448        resp->count = resp->buffer - argp->buffer;
 449        if (resp->offset)
 450                xdr_encode_hyper(resp->offset, argp->cookie);
 451
 452        RETURN_STATUS(nfserr);
 453}
 454
 455/*
 456 * Read a portion of a directory, including file handles and attrs.
 457 * For now, we choose to ignore the dircount parameter.
 458 */
 459static __be32
 460nfsd3_proc_readdirplus(struct svc_rqst *rqstp)
 461{
 462        struct nfsd3_readdirargs *argp = rqstp->rq_argp;
 463        struct nfsd3_readdirres  *resp = rqstp->rq_resp;
 464        __be32  nfserr;
 465        int     count = 0;
 466        loff_t  offset;
 467        struct page **p;
 468        caddr_t page_addr = NULL;
 469
 470        dprintk("nfsd: READDIR+(3) %s %d bytes at %d\n",
 471                                SVCFH_fmt(&argp->fh),
 472                                argp->count, (u32) argp->cookie);
 473
 474        /* Convert byte count to number of words (i.e. >> 2),
 475         * and reserve room for the NULL ptr & eof flag (-2 words) */
 476        resp->count = (argp->count >> 2) - 2;
 477
 478        /* Read directory and encode entries on the fly */
 479        fh_copy(&resp->fh, &argp->fh);
 480
 481        resp->common.err = nfs_ok;
 482        resp->buffer = argp->buffer;
 483        resp->buflen = resp->count;
 484        resp->rqstp = rqstp;
 485        offset = argp->cookie;
 486
 487        nfserr = fh_verify(rqstp, &resp->fh, S_IFDIR, NFSD_MAY_NOP);
 488        if (nfserr)
 489                RETURN_STATUS(nfserr);
 490
 491        if (resp->fh.fh_export->ex_flags & NFSEXP_NOREADDIRPLUS)
 492                RETURN_STATUS(nfserr_notsupp);
 493
 494        nfserr = nfsd_readdir(rqstp, &resp->fh,
 495                                     &offset,
 496                                     &resp->common,
 497                                     nfs3svc_encode_entry_plus);
 498        memcpy(resp->verf, argp->verf, 8);
 499        for (p = rqstp->rq_respages + 1; p < rqstp->rq_next_page; p++) {
 500                page_addr = page_address(*p);
 501
 502                if (((caddr_t)resp->buffer >= page_addr) &&
 503                    ((caddr_t)resp->buffer < page_addr + PAGE_SIZE)) {
 504                        count += (caddr_t)resp->buffer - page_addr;
 505                        break;
 506                }
 507                count += PAGE_SIZE;
 508        }
 509        resp->count = count >> 2;
 510        if (resp->offset) {
 511                if (unlikely(resp->offset1)) {
 512                        /* we ended up with offset on a page boundary */
 513                        *resp->offset = htonl(offset >> 32);
 514                        *resp->offset1 = htonl(offset & 0xffffffff);
 515                        resp->offset1 = NULL;
 516                } else {
 517                        xdr_encode_hyper(resp->offset, offset);
 518                }
 519        }
 520
 521        RETURN_STATUS(nfserr);
 522}
 523
 524/*
 525 * Get file system stats
 526 */
 527static __be32
 528nfsd3_proc_fsstat(struct svc_rqst *rqstp)
 529{
 530        struct nfsd_fhandle *argp = rqstp->rq_argp;
 531        struct nfsd3_fsstatres *resp = rqstp->rq_resp;
 532        __be32  nfserr;
 533
 534        dprintk("nfsd: FSSTAT(3)   %s\n",
 535                                SVCFH_fmt(&argp->fh));
 536
 537        nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats, 0);
 538        fh_put(&argp->fh);
 539        RETURN_STATUS(nfserr);
 540}
 541
 542/*
 543 * Get file system info
 544 */
 545static __be32
 546nfsd3_proc_fsinfo(struct svc_rqst *rqstp)
 547{
 548        struct nfsd_fhandle *argp = rqstp->rq_argp;
 549        struct nfsd3_fsinfores *resp = rqstp->rq_resp;
 550        __be32  nfserr;
 551        u32     max_blocksize = svc_max_payload(rqstp);
 552
 553        dprintk("nfsd: FSINFO(3)   %s\n",
 554                                SVCFH_fmt(&argp->fh));
 555
 556        resp->f_rtmax  = max_blocksize;
 557        resp->f_rtpref = max_blocksize;
 558        resp->f_rtmult = PAGE_SIZE;
 559        resp->f_wtmax  = max_blocksize;
 560        resp->f_wtpref = max_blocksize;
 561        resp->f_wtmult = PAGE_SIZE;
 562        resp->f_dtpref = PAGE_SIZE;
 563        resp->f_maxfilesize = ~(u32) 0;
 564        resp->f_properties = NFS3_FSF_DEFAULT;
 565
 566        nfserr = fh_verify(rqstp, &argp->fh, 0,
 567                        NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
 568
 569        /* Check special features of the file system. May request
 570         * different read/write sizes for file systems known to have
 571         * problems with large blocks */
 572        if (nfserr == 0) {
 573                struct super_block *sb = argp->fh.fh_dentry->d_sb;
 574
 575                /* Note that we don't care for remote fs's here */
 576                if (sb->s_magic == MSDOS_SUPER_MAGIC) {
 577                        resp->f_properties = NFS3_FSF_BILLYBOY;
 578                }
 579                resp->f_maxfilesize = sb->s_maxbytes;
 580        }
 581
 582        fh_put(&argp->fh);
 583        RETURN_STATUS(nfserr);
 584}
 585
 586/*
 587 * Get pathconf info for the specified file
 588 */
 589static __be32
 590nfsd3_proc_pathconf(struct svc_rqst *rqstp)
 591{
 592        struct nfsd_fhandle *argp = rqstp->rq_argp;
 593        struct nfsd3_pathconfres *resp = rqstp->rq_resp;
 594        __be32  nfserr;
 595
 596        dprintk("nfsd: PATHCONF(3) %s\n",
 597                                SVCFH_fmt(&argp->fh));
 598
 599        /* Set default pathconf */
 600        resp->p_link_max = 255;         /* at least */
 601        resp->p_name_max = 255;         /* at least */
 602        resp->p_no_trunc = 0;
 603        resp->p_chown_restricted = 1;
 604        resp->p_case_insensitive = 0;
 605        resp->p_case_preserving = 1;
 606
 607        nfserr = fh_verify(rqstp, &argp->fh, 0, NFSD_MAY_NOP);
 608
 609        if (nfserr == 0) {
 610                struct super_block *sb = argp->fh.fh_dentry->d_sb;
 611
 612                /* Note that we don't care for remote fs's here */
 613                switch (sb->s_magic) {
 614                case EXT2_SUPER_MAGIC:
 615                        resp->p_link_max = EXT2_LINK_MAX;
 616                        resp->p_name_max = EXT2_NAME_LEN;
 617                        break;
 618                case MSDOS_SUPER_MAGIC:
 619                        resp->p_case_insensitive = 1;
 620                        resp->p_case_preserving  = 0;
 621                        break;
 622                }
 623        }
 624
 625        fh_put(&argp->fh);
 626        RETURN_STATUS(nfserr);
 627}
 628
 629
 630/*
 631 * Commit a file (range) to stable storage.
 632 */
 633static __be32
 634nfsd3_proc_commit(struct svc_rqst *rqstp)
 635{
 636        struct nfsd3_commitargs *argp = rqstp->rq_argp;
 637        struct nfsd3_commitres *resp = rqstp->rq_resp;
 638        __be32  nfserr;
 639
 640        dprintk("nfsd: COMMIT(3)   %s %u@%Lu\n",
 641                                SVCFH_fmt(&argp->fh),
 642                                argp->count,
 643                                (unsigned long long) argp->offset);
 644
 645        if (argp->offset > NFS_OFFSET_MAX)
 646                RETURN_STATUS(nfserr_inval);
 647
 648        fh_copy(&resp->fh, &argp->fh);
 649        nfserr = nfsd_commit(rqstp, &resp->fh, argp->offset, argp->count);
 650
 651        RETURN_STATUS(nfserr);
 652}
 653
 654
 655/*
 656 * NFSv3 Server procedures.
 657 * Only the results of non-idempotent operations are cached.
 658 */
 659#define nfs3svc_decode_fhandleargs      nfs3svc_decode_fhandle
 660#define nfs3svc_encode_attrstatres      nfs3svc_encode_attrstat
 661#define nfs3svc_encode_wccstatres       nfs3svc_encode_wccstat
 662#define nfsd3_mkdirargs                 nfsd3_createargs
 663#define nfsd3_readdirplusargs           nfsd3_readdirargs
 664#define nfsd3_fhandleargs               nfsd_fhandle
 665#define nfsd3_fhandleres                nfsd3_attrstat
 666#define nfsd3_attrstatres               nfsd3_attrstat
 667#define nfsd3_wccstatres                nfsd3_attrstat
 668#define nfsd3_createres                 nfsd3_diropres
 669#define nfsd3_voidres                   nfsd3_voidargs
 670struct nfsd3_voidargs { int dummy; };
 671
 672#define ST 1            /* status*/
 673#define FH 17           /* filehandle with length */
 674#define AT 21           /* attributes */
 675#define pAT (1+AT)      /* post attributes - conditional */
 676#define WC (7+pAT)      /* WCC attributes */
 677
 678static const struct svc_procedure nfsd_procedures3[22] = {
 679        [NFS3PROC_NULL] = {
 680                .pc_func = nfsd3_proc_null,
 681                .pc_encode = nfs3svc_encode_voidres,
 682                .pc_argsize = sizeof(struct nfsd3_voidargs),
 683                .pc_ressize = sizeof(struct nfsd3_voidres),
 684                .pc_cachetype = RC_NOCACHE,
 685                .pc_xdrressize = ST,
 686        },
 687        [NFS3PROC_GETATTR] = {
 688                .pc_func = nfsd3_proc_getattr,
 689                .pc_decode = nfs3svc_decode_fhandleargs,
 690                .pc_encode = nfs3svc_encode_attrstatres,
 691                .pc_release = nfs3svc_release_fhandle,
 692                .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 693                .pc_ressize = sizeof(struct nfsd3_attrstatres),
 694                .pc_cachetype = RC_NOCACHE,
 695                .pc_xdrressize = ST+AT,
 696        },
 697        [NFS3PROC_SETATTR] = {
 698                .pc_func = nfsd3_proc_setattr,
 699                .pc_decode = nfs3svc_decode_sattrargs,
 700                .pc_encode = nfs3svc_encode_wccstatres,
 701                .pc_release = nfs3svc_release_fhandle,
 702                .pc_argsize = sizeof(struct nfsd3_sattrargs),
 703                .pc_ressize = sizeof(struct nfsd3_wccstatres),
 704                .pc_cachetype = RC_REPLBUFF,
 705                .pc_xdrressize = ST+WC,
 706        },
 707        [NFS3PROC_LOOKUP] = {
 708                .pc_func = nfsd3_proc_lookup,
 709                .pc_decode = nfs3svc_decode_diropargs,
 710                .pc_encode = nfs3svc_encode_diropres,
 711                .pc_release = nfs3svc_release_fhandle2,
 712                .pc_argsize = sizeof(struct nfsd3_diropargs),
 713                .pc_ressize = sizeof(struct nfsd3_diropres),
 714                .pc_cachetype = RC_NOCACHE,
 715                .pc_xdrressize = ST+FH+pAT+pAT,
 716        },
 717        [NFS3PROC_ACCESS] = {
 718                .pc_func = nfsd3_proc_access,
 719                .pc_decode = nfs3svc_decode_accessargs,
 720                .pc_encode = nfs3svc_encode_accessres,
 721                .pc_release = nfs3svc_release_fhandle,
 722                .pc_argsize = sizeof(struct nfsd3_accessargs),
 723                .pc_ressize = sizeof(struct nfsd3_accessres),
 724                .pc_cachetype = RC_NOCACHE,
 725                .pc_xdrressize = ST+pAT+1,
 726        },
 727        [NFS3PROC_READLINK] = {
 728                .pc_func = nfsd3_proc_readlink,
 729                .pc_decode = nfs3svc_decode_readlinkargs,
 730                .pc_encode = nfs3svc_encode_readlinkres,
 731                .pc_release = nfs3svc_release_fhandle,
 732                .pc_argsize = sizeof(struct nfsd3_readlinkargs),
 733                .pc_ressize = sizeof(struct nfsd3_readlinkres),
 734                .pc_cachetype = RC_NOCACHE,
 735                .pc_xdrressize = ST+pAT+1+NFS3_MAXPATHLEN/4,
 736        },
 737        [NFS3PROC_READ] = {
 738                .pc_func = nfsd3_proc_read,
 739                .pc_decode = nfs3svc_decode_readargs,
 740                .pc_encode = nfs3svc_encode_readres,
 741                .pc_release = nfs3svc_release_fhandle,
 742                .pc_argsize = sizeof(struct nfsd3_readargs),
 743                .pc_ressize = sizeof(struct nfsd3_readres),
 744                .pc_cachetype = RC_NOCACHE,
 745                .pc_xdrressize = ST+pAT+4+NFSSVC_MAXBLKSIZE/4,
 746        },
 747        [NFS3PROC_WRITE] = {
 748                .pc_func = nfsd3_proc_write,
 749                .pc_decode = nfs3svc_decode_writeargs,
 750                .pc_encode = nfs3svc_encode_writeres,
 751                .pc_release = nfs3svc_release_fhandle,
 752                .pc_argsize = sizeof(struct nfsd3_writeargs),
 753                .pc_ressize = sizeof(struct nfsd3_writeres),
 754                .pc_cachetype = RC_REPLBUFF,
 755                .pc_xdrressize = ST+WC+4,
 756        },
 757        [NFS3PROC_CREATE] = {
 758                .pc_func = nfsd3_proc_create,
 759                .pc_decode = nfs3svc_decode_createargs,
 760                .pc_encode = nfs3svc_encode_createres,
 761                .pc_release = nfs3svc_release_fhandle2,
 762                .pc_argsize = sizeof(struct nfsd3_createargs),
 763                .pc_ressize = sizeof(struct nfsd3_createres),
 764                .pc_cachetype = RC_REPLBUFF,
 765                .pc_xdrressize = ST+(1+FH+pAT)+WC,
 766        },
 767        [NFS3PROC_MKDIR] = {
 768                .pc_func = nfsd3_proc_mkdir,
 769                .pc_decode = nfs3svc_decode_mkdirargs,
 770                .pc_encode = nfs3svc_encode_createres,
 771                .pc_release = nfs3svc_release_fhandle2,
 772                .pc_argsize = sizeof(struct nfsd3_mkdirargs),
 773                .pc_ressize = sizeof(struct nfsd3_createres),
 774                .pc_cachetype = RC_REPLBUFF,
 775                .pc_xdrressize = ST+(1+FH+pAT)+WC,
 776        },
 777        [NFS3PROC_SYMLINK] = {
 778                .pc_func = nfsd3_proc_symlink,
 779                .pc_decode = nfs3svc_decode_symlinkargs,
 780                .pc_encode = nfs3svc_encode_createres,
 781                .pc_release = nfs3svc_release_fhandle2,
 782                .pc_argsize = sizeof(struct nfsd3_symlinkargs),
 783                .pc_ressize = sizeof(struct nfsd3_createres),
 784                .pc_cachetype = RC_REPLBUFF,
 785                .pc_xdrressize = ST+(1+FH+pAT)+WC,
 786        },
 787        [NFS3PROC_MKNOD] = {
 788                .pc_func = nfsd3_proc_mknod,
 789                .pc_decode = nfs3svc_decode_mknodargs,
 790                .pc_encode = nfs3svc_encode_createres,
 791                .pc_release = nfs3svc_release_fhandle2,
 792                .pc_argsize = sizeof(struct nfsd3_mknodargs),
 793                .pc_ressize = sizeof(struct nfsd3_createres),
 794                .pc_cachetype = RC_REPLBUFF,
 795                .pc_xdrressize = ST+(1+FH+pAT)+WC,
 796        },
 797        [NFS3PROC_REMOVE] = {
 798                .pc_func = nfsd3_proc_remove,
 799                .pc_decode = nfs3svc_decode_diropargs,
 800                .pc_encode = nfs3svc_encode_wccstatres,
 801                .pc_release = nfs3svc_release_fhandle,
 802                .pc_argsize = sizeof(struct nfsd3_diropargs),
 803                .pc_ressize = sizeof(struct nfsd3_wccstatres),
 804                .pc_cachetype = RC_REPLBUFF,
 805                .pc_xdrressize = ST+WC,
 806        },
 807        [NFS3PROC_RMDIR] = {
 808                .pc_func = nfsd3_proc_rmdir,
 809                .pc_decode = nfs3svc_decode_diropargs,
 810                .pc_encode = nfs3svc_encode_wccstatres,
 811                .pc_release = nfs3svc_release_fhandle,
 812                .pc_argsize = sizeof(struct nfsd3_diropargs),
 813                .pc_ressize = sizeof(struct nfsd3_wccstatres),
 814                .pc_cachetype = RC_REPLBUFF,
 815                .pc_xdrressize = ST+WC,
 816        },
 817        [NFS3PROC_RENAME] = {
 818                .pc_func = nfsd3_proc_rename,
 819                .pc_decode = nfs3svc_decode_renameargs,
 820                .pc_encode = nfs3svc_encode_renameres,
 821                .pc_release = nfs3svc_release_fhandle2,
 822                .pc_argsize = sizeof(struct nfsd3_renameargs),
 823                .pc_ressize = sizeof(struct nfsd3_renameres),
 824                .pc_cachetype = RC_REPLBUFF,
 825                .pc_xdrressize = ST+WC+WC,
 826        },
 827        [NFS3PROC_LINK] = {
 828                .pc_func = nfsd3_proc_link,
 829                .pc_decode = nfs3svc_decode_linkargs,
 830                .pc_encode = nfs3svc_encode_linkres,
 831                .pc_release = nfs3svc_release_fhandle2,
 832                .pc_argsize = sizeof(struct nfsd3_linkargs),
 833                .pc_ressize = sizeof(struct nfsd3_linkres),
 834                .pc_cachetype = RC_REPLBUFF,
 835                .pc_xdrressize = ST+pAT+WC,
 836        },
 837        [NFS3PROC_READDIR] = {
 838                .pc_func = nfsd3_proc_readdir,
 839                .pc_decode = nfs3svc_decode_readdirargs,
 840                .pc_encode = nfs3svc_encode_readdirres,
 841                .pc_release = nfs3svc_release_fhandle,
 842                .pc_argsize = sizeof(struct nfsd3_readdirargs),
 843                .pc_ressize = sizeof(struct nfsd3_readdirres),
 844                .pc_cachetype = RC_NOCACHE,
 845        },
 846        [NFS3PROC_READDIRPLUS] = {
 847                .pc_func = nfsd3_proc_readdirplus,
 848                .pc_decode = nfs3svc_decode_readdirplusargs,
 849                .pc_encode = nfs3svc_encode_readdirres,
 850                .pc_release = nfs3svc_release_fhandle,
 851                .pc_argsize = sizeof(struct nfsd3_readdirplusargs),
 852                .pc_ressize = sizeof(struct nfsd3_readdirres),
 853                .pc_cachetype = RC_NOCACHE,
 854        },
 855        [NFS3PROC_FSSTAT] = {
 856                .pc_func = nfsd3_proc_fsstat,
 857                .pc_decode = nfs3svc_decode_fhandleargs,
 858                .pc_encode = nfs3svc_encode_fsstatres,
 859                .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 860                .pc_ressize = sizeof(struct nfsd3_fsstatres),
 861                .pc_cachetype = RC_NOCACHE,
 862                .pc_xdrressize = ST+pAT+2*6+1,
 863        },
 864        [NFS3PROC_FSINFO] = {
 865                .pc_func = nfsd3_proc_fsinfo,
 866                .pc_decode = nfs3svc_decode_fhandleargs,
 867                .pc_encode = nfs3svc_encode_fsinfores,
 868                .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 869                .pc_ressize = sizeof(struct nfsd3_fsinfores),
 870                .pc_cachetype = RC_NOCACHE,
 871                .pc_xdrressize = ST+pAT+12,
 872        },
 873        [NFS3PROC_PATHCONF] = {
 874                .pc_func = nfsd3_proc_pathconf,
 875                .pc_decode = nfs3svc_decode_fhandleargs,
 876                .pc_encode = nfs3svc_encode_pathconfres,
 877                .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 878                .pc_ressize = sizeof(struct nfsd3_pathconfres),
 879                .pc_cachetype = RC_NOCACHE,
 880                .pc_xdrressize = ST+pAT+6,
 881        },
 882        [NFS3PROC_COMMIT] = {
 883                .pc_func = nfsd3_proc_commit,
 884                .pc_decode = nfs3svc_decode_commitargs,
 885                .pc_encode = nfs3svc_encode_commitres,
 886                .pc_release = nfs3svc_release_fhandle,
 887                .pc_argsize = sizeof(struct nfsd3_commitargs),
 888                .pc_ressize = sizeof(struct nfsd3_commitres),
 889                .pc_cachetype = RC_NOCACHE,
 890                .pc_xdrressize = ST+WC+2,
 891        },
 892};
 893
 894static unsigned int nfsd_count3[ARRAY_SIZE(nfsd_procedures3)];
 895const struct svc_version nfsd_version3 = {
 896        .vs_vers        = 3,
 897        .vs_nproc       = 22,
 898        .vs_proc        = nfsd_procedures3,
 899        .vs_dispatch    = nfsd_dispatch,
 900        .vs_count       = nfsd_count3,
 901        .vs_xdrsize     = NFS3_SVC_XDRSIZE,
 902};
 903