fs/nfsd/nfs3proc.c

   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 #include <linux/namei.h>
  12
  13 #include "cache.h"
  14 #include "xdr3.h"
  15 #include "vfs.h"
  16
  17 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  18
  19 static int      nfs3_ftypes[] = {
  20         0,                      /* NF3NON */
  21         S_IFREG,                /* NF3REG */
  22         S_IFDIR,                /* NF3DIR */
  23         S_IFBLK,                /* NF3BLK */
  24         S_IFCHR,                /* NF3CHR */
  25         S_IFLNK,                /* NF3LNK */
  26         S_IFSOCK,               /* NF3SOCK */
  27         S_IFIFO,                /* NF3FIFO */
  28 };
  29
  30 /*
  31  * NULL call.
  32  */
  33 static __be32
  34 nfsd3_proc_null(struct svc_rqst *rqstp)
  35 {
  36         return rpc_success;
  37 }
  38
  39 /*
  40  * Get a file's attributes
  41  */
  42 static __be32
  43 nfsd3_proc_getattr(struct svc_rqst *rqstp)
  44 {
  45         struct nfsd_fhandle *argp = rqstp->rq_argp;
  46         struct nfsd3_attrstat *resp = rqstp->rq_resp;
  47
  48         dprintk("nfsd: GETATTR(3)  %s\n",
  49                 SVCFH_fmt(&argp->fh));
  50
  51         fh_copy(&resp->fh, &argp->fh);
  52         resp->status = fh_verify(rqstp, &resp->fh, 0,
  53                                  NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
  54         if (resp->status != nfs_ok)
  55                 goto out;
  56
  57         resp->status = fh_getattr(&resp->fh, &resp->stat);
  58 out:
  59         return rpc_success;
  60 }
  61
  62 /*
  63  * Set a file's attributes
  64  */
  65 static __be32
  66 nfsd3_proc_setattr(struct svc_rqst *rqstp)
  67 {
  68         struct nfsd3_sattrargs *argp = rqstp->rq_argp;
  69         struct nfsd3_attrstat *resp = rqstp->rq_resp;
  70
  71         dprintk("nfsd: SETATTR(3)  %s\n",
  72                                 SVCFH_fmt(&argp->fh));
  73
  74         fh_copy(&resp->fh, &argp->fh);
  75         resp->status = nfsd_setattr(rqstp, &resp->fh, &argp->attrs,
  76                                     argp->check_guard, argp->guardtime);
  77         return rpc_success;
  78 }
  79
  80 /*
  81  * Look up a path name component
  82  */
  83 static __be32
  84 nfsd3_proc_lookup(struct svc_rqst *rqstp)
  85 {
  86         struct nfsd3_diropargs *argp = rqstp->rq_argp;
  87         struct nfsd3_diropres  *resp = rqstp->rq_resp;
  88
  89         dprintk("nfsd: LOOKUP(3)   %s %.*s\n",
  90                                 SVCFH_fmt(&argp->fh),
  91                                 argp->len,
  92                                 argp->name);
  93
  94         fh_copy(&resp->dirfh, &argp->fh);
  95         fh_init(&resp->fh, NFS3_FHSIZE);
  96
  97         resp->status = nfsd_lookup(rqstp, &resp->dirfh,
  98                                    argp->name, argp->len,
  99                                    &resp->fh);
 100         return rpc_success;
 101 }
 102
 103 /*
 104  * Check file access
 105  */
 106 static __be32
 107 nfsd3_proc_access(struct svc_rqst *rqstp)
 108 {
 109         struct nfsd3_accessargs *argp = rqstp->rq_argp;
 110         struct nfsd3_accessres *resp = rqstp->rq_resp;
 111
 112         dprintk("nfsd: ACCESS(3)   %s 0x%x\n",
 113                                 SVCFH_fmt(&argp->fh),
 114                                 argp->access);
 115
 116         fh_copy(&resp->fh, &argp->fh);
 117         resp->access = argp->access;
 118         resp->status = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
 119         return rpc_success;
 120 }
 121
 122 /*
 123  * Read a symlink.
 124  */
 125 static __be32
 126 nfsd3_proc_readlink(struct svc_rqst *rqstp)
 127 {
 128         struct nfsd_fhandle *argp = rqstp->rq_argp;
 129         struct nfsd3_readlinkres *resp = rqstp->rq_resp;
 130
 131         dprintk("nfsd: READLINK(3) %s\n", SVCFH_fmt(&argp->fh));
 132
 133         /* Read the symlink. */
 134         fh_copy(&resp->fh, &argp->fh);
 135         resp->len = NFS3_MAXPATHLEN;
 136         resp->pages = rqstp->rq_next_page++;
 137         resp->status = nfsd_readlink(rqstp, &resp->fh,
 138                                      page_address(*resp->pages), &resp->len);
 139         return rpc_success;
 140 }
 141
 142 /*
 143  * Read a portion of a file.
 144  */
 145 static __be32
 146 nfsd3_proc_read(struct svc_rqst *rqstp)
 147 {
 148         struct nfsd3_readargs *argp = rqstp->rq_argp;
 149         struct nfsd3_readres *resp = rqstp->rq_resp;
 150         u32 max_blocksize = svc_max_payload(rqstp);
 151         unsigned int len;
 152         int v;
 153
 154         dprintk("nfsd: READ(3) %s %lu bytes at %Lu\n",
 155                                 SVCFH_fmt(&argp->fh),
 156                                 (unsigned long) argp->count,
 157                                 (unsigned long long) argp->offset);
 158
 159         argp->count = min_t(u32, argp->count, max_blocksize);
 160         if (argp->offset > (u64)OFFSET_MAX)
 161                 argp->offset = (u64)OFFSET_MAX;
 162         if (argp->offset + argp->count > (u64)OFFSET_MAX)
 163                 argp->count = (u64)OFFSET_MAX - argp->offset;
 164
 165         v = 0;
 166         len = argp->count;
 167         resp->pages = rqstp->rq_next_page;
 168         while (len > 0) {
 169                 struct page *page = *(rqstp->rq_next_page++);
 170
 171                 rqstp->rq_vec[v].iov_base = page_address(page);
 172                 rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
 173                 len -= rqstp->rq_vec[v].iov_len;
 174                 v++;
 175         }
 176
 177         /* Obtain buffer pointer for payload.
 178          * 1 (status) + 22 (post_op_attr) + 1 (count) + 1 (eof)
 179          * + 1 (xdr opaque byte count) = 26
 180          */
 181         resp->count = argp->count;
 182         svc_reserve_auth(rqstp, ((1 + NFS3_POST_OP_ATTR_WORDS + 3)<<2) + resp->count +4);
 183
 184         fh_copy(&resp->fh, &argp->fh);
 185         resp->status = nfsd_read(rqstp, &resp->fh, argp->offset,
 186                                  rqstp->rq_vec, v, &resp->count, &resp->eof);
 187         return rpc_success;
 188 }
 189
 190 /*
 191  * Write data to a file
 192  */
 193 static __be32
 194 nfsd3_proc_write(struct svc_rqst *rqstp)
 195 {
 196         struct nfsd3_writeargs *argp = rqstp->rq_argp;
 197         struct nfsd3_writeres *resp = rqstp->rq_resp;
 198         unsigned long cnt = argp->len;
 199         unsigned int nvecs;
 200
 201         dprintk("nfsd: WRITE(3)    %s %d bytes at %Lu%s\n",
 202                                 SVCFH_fmt(&argp->fh),
 203                                 argp->len,
 204                                 (unsigned long long) argp->offset,
 205                                 argp->stable? " stable" : "");
 206
 207         resp->status = nfserr_fbig;
 208         if (argp->offset > (u64)OFFSET_MAX ||
 209             argp->offset + argp->len > (u64)OFFSET_MAX)
 210                 return rpc_success;
 211
 212         fh_copy(&resp->fh, &argp->fh);
 213         resp->committed = argp->stable;
 214         nvecs = svc_fill_write_vector(rqstp, &argp->payload);
 215
 216         resp->status = nfsd_write(rqstp, &resp->fh, argp->offset,
 217                                   rqstp->rq_vec, nvecs, &cnt,
 218                                   resp->committed, resp->verf);
 219         resp->count = cnt;
 220         return rpc_success;
 221 }
 222
 223 /*
 224  * Implement NFSv3's unchecked, guarded, and exclusive CREATE
 225  * semantics for regular files. Except for the created file,
 226  * this operation is stateless on the server.
 227  *
 228  * Upon return, caller must release @fhp and @resfhp.
 229  */
 230 static __be32
 231 nfsd3_create_file(struct svc_rqst *rqstp, struct svc_fh *fhp,
 232                   struct svc_fh *resfhp, struct nfsd3_createargs *argp)
 233 {
 234         struct iattr *iap = &argp->attrs;
 235         struct dentry *parent, *child;
 236         __u32 v_mtime, v_atime;
 237         struct inode *inode;
 238         __be32 status;
 239         int host_err;
 240
 241         if (isdotent(argp->name, argp->len))
 242                 return nfserr_exist;
 243         if (!(iap->ia_valid & ATTR_MODE))
 244                 iap->ia_mode = 0;
 245
 246         status = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC);
 247         if (status != nfs_ok)
 248                 return status;
 249
 250         parent = fhp->fh_dentry;
 251         inode = d_inode(parent);
 252
 253         host_err = fh_want_write(fhp);
 254         if (host_err)
 255                 return nfserrno(host_err);
 256
 257         fh_lock_nested(fhp, I_MUTEX_PARENT);
 258
 259         child = lookup_one_len(argp->name, parent, argp->len);
 260         if (IS_ERR(child)) {
 261                 status = nfserrno(PTR_ERR(child));
 262                 goto out;
 263         }
 264
 265         if (d_really_is_negative(child)) {
 266                 status = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE);
 267                 if (status != nfs_ok)
 268                         goto out;
 269         }
 270
 271         status = fh_compose(resfhp, fhp->fh_export, child, fhp);
 272         if (status != nfs_ok)
 273                 goto out;
 274
 275         v_mtime = 0;
 276         v_atime = 0;
 277         if (argp->createmode == NFS3_CREATE_EXCLUSIVE) {
 278                 u32 *verifier = (u32 *)argp->verf;
 279
 280                 /*
 281                  * Solaris 7 gets confused (bugid 4218508) if these have
 282                  * the high bit set, as do xfs filesystems without the
 283                  * "bigtime" feature. So just clear the high bits.
 284                  */
 285                 v_mtime = verifier[0] & 0x7fffffff;
 286                 v_atime = verifier[1] & 0x7fffffff;
 287         }
 288
 289         if (d_really_is_positive(child)) {
 290                 status = nfs_ok;
 291
 292                 switch (argp->createmode) {
 293                 case NFS3_CREATE_UNCHECKED:
 294                         if (!d_is_reg(child))
 295                                 break;
 296                         iap->ia_valid &= ATTR_SIZE;
 297                         goto set_attr;
 298                 case NFS3_CREATE_GUARDED:
 299                         status = nfserr_exist;
 300                         break;
 301                 case NFS3_CREATE_EXCLUSIVE:
 302                         if (d_inode(child)->i_mtime.tv_sec == v_mtime &&
 303                             d_inode(child)->i_atime.tv_sec == v_atime &&
 304                             d_inode(child)->i_size == 0) {
 305                                 break;
 306                         }
 307                         status = nfserr_exist;
 308                 }
 309                 goto out;
 310         }
 311
 312         if (!IS_POSIXACL(inode))
 313                 iap->ia_mode &= ~current_umask();
 314
 315         host_err = vfs_create(&init_user_ns, inode, child, iap->ia_mode, true);
 316         if (host_err < 0) {
 317                 status = nfserrno(host_err);
 318                 goto out;
 319         }
 320
 321         /* A newly created file already has a file size of zero. */
 322         if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0))
 323                 iap->ia_valid &= ~ATTR_SIZE;
 324         if (argp->createmode == NFS3_CREATE_EXCLUSIVE) {
 325                 iap->ia_valid = ATTR_MTIME | ATTR_ATIME |
 326                                 ATTR_MTIME_SET | ATTR_ATIME_SET;
 327                 iap->ia_mtime.tv_sec = v_mtime;
 328                 iap->ia_atime.tv_sec = v_atime;
 329                 iap->ia_mtime.tv_nsec = 0;
 330                 iap->ia_atime.tv_nsec = 0;
 331         }
 332
 333 set_attr:
 334         status = nfsd_create_setattr(rqstp, fhp, resfhp, iap);
 335
 336 out:
 337         fh_unlock(fhp);
 338         if (child && !IS_ERR(child))
 339                 dput(child);
 340         fh_drop_write(fhp);
 341         return status;
 342 }
 343
 344 static __be32
 345 nfsd3_proc_create(struct svc_rqst *rqstp)
 346 {
 347         struct nfsd3_createargs *argp = rqstp->rq_argp;
 348         struct nfsd3_diropres *resp = rqstp->rq_resp;
 349         svc_fh *dirfhp, *newfhp;
 350
 351         dprintk("nfsd: CREATE(3)   %s %.*s\n",
 352                                 SVCFH_fmt(&argp->fh),
 353                                 argp->len,
 354                                 argp->name);
 355
 356         dirfhp = fh_copy(&resp->dirfh, &argp->fh);
 357         newfhp = fh_init(&resp->fh, NFS3_FHSIZE);
 358
 359         resp->status = nfsd3_create_file(rqstp, dirfhp, newfhp, argp);
 360         return rpc_success;
 361 }
 362
 363 /*
 364  * Make directory. This operation is not idempotent.
 365  */
 366 static __be32
 367 nfsd3_proc_mkdir(struct svc_rqst *rqstp)
 368 {
 369         struct nfsd3_createargs *argp = rqstp->rq_argp;
 370         struct nfsd3_diropres *resp = rqstp->rq_resp;
 371
 372         dprintk("nfsd: MKDIR(3)    %s %.*s\n",
 373                                 SVCFH_fmt(&argp->fh),
 374                                 argp->len,
 375                                 argp->name);
 376
 377         argp->attrs.ia_valid &= ~ATTR_SIZE;
 378         fh_copy(&resp->dirfh, &argp->fh);
 379         fh_init(&resp->fh, NFS3_FHSIZE);
 380         resp->status = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
 381                                    &argp->attrs, S_IFDIR, 0, &resp->fh);
 382         fh_unlock(&resp->dirfh);
 383         return rpc_success;
 384 }
 385
 386 static __be32
 387 nfsd3_proc_symlink(struct svc_rqst *rqstp)
 388 {
 389         struct nfsd3_symlinkargs *argp = rqstp->rq_argp;
 390         struct nfsd3_diropres *resp = rqstp->rq_resp;
 391
 392         if (argp->tlen == 0) {
 393                 resp->status = nfserr_inval;
 394                 goto out;
 395         }
 396         if (argp->tlen > NFS3_MAXPATHLEN) {
 397                 resp->status = nfserr_nametoolong;
 398                 goto out;
 399         }
 400
 401         argp->tname = svc_fill_symlink_pathname(rqstp, &argp->first,
 402                                                 page_address(rqstp->rq_arg.pages[0]),
 403                                                 argp->tlen);
 404         if (IS_ERR(argp->tname)) {
 405                 resp->status = nfserrno(PTR_ERR(argp->tname));
 406                 goto out;
 407         }
 408
 409         dprintk("nfsd: SYMLINK(3)  %s %.*s -> %.*s\n",
 410                                 SVCFH_fmt(&argp->ffh),
 411                                 argp->flen, argp->fname,
 412                                 argp->tlen, argp->tname);
 413
 414         fh_copy(&resp->dirfh, &argp->ffh);
 415         fh_init(&resp->fh, NFS3_FHSIZE);
 416         resp->status = nfsd_symlink(rqstp, &resp->dirfh, argp->fname,
 417                                     argp->flen, argp->tname, &resp->fh);
 418         kfree(argp->tname);
 419 out:
 420         return rpc_success;
 421 }
 422
 423 /*
 424  * Make socket/fifo/device.
 425  */
 426 static __be32
 427 nfsd3_proc_mknod(struct svc_rqst *rqstp)
 428 {
 429         struct nfsd3_mknodargs *argp = rqstp->rq_argp;
 430         struct nfsd3_diropres  *resp = rqstp->rq_resp;
 431         int type;
 432         dev_t   rdev = 0;
 433
 434         dprintk("nfsd: MKNOD(3)    %s %.*s\n",
 435                                 SVCFH_fmt(&argp->fh),
 436                                 argp->len,
 437                                 argp->name);
 438
 439         fh_copy(&resp->dirfh, &argp->fh);
 440         fh_init(&resp->fh, NFS3_FHSIZE);
 441
 442         if (argp->ftype == NF3CHR || argp->ftype == NF3BLK) {
 443                 rdev = MKDEV(argp->major, argp->minor);
 444                 if (MAJOR(rdev) != argp->major ||
 445                     MINOR(rdev) != argp->minor) {
 446                         resp->status = nfserr_inval;
 447                         goto out;
 448                 }
 449         } else if (argp->ftype != NF3SOCK && argp->ftype != NF3FIFO) {
 450                 resp->status = nfserr_badtype;
 451                 goto out;
 452         }
 453
 454         type = nfs3_ftypes[argp->ftype];
 455         resp->status = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
 456                                    &argp->attrs, type, rdev, &resp->fh);
 457         fh_unlock(&resp->dirfh);
 458 out:
 459         return rpc_success;
 460 }
 461
 462 /*
 463  * Remove file/fifo/socket etc.
 464  */
 465 static __be32
 466 nfsd3_proc_remove(struct svc_rqst *rqstp)
 467 {
 468         struct nfsd3_diropargs *argp = rqstp->rq_argp;
 469         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 470
 471         dprintk("nfsd: REMOVE(3)   %s %.*s\n",
 472                                 SVCFH_fmt(&argp->fh),
 473                                 argp->len,
 474                                 argp->name);
 475
 476         /* Unlink. -S_IFDIR means file must not be a directory */
 477         fh_copy(&resp->fh, &argp->fh);
 478         resp->status = nfsd_unlink(rqstp, &resp->fh, -S_IFDIR,
 479                                    argp->name, argp->len);
 480         fh_unlock(&resp->fh);
 481         return rpc_success;
 482 }
 483
 484 /*
 485  * Remove a directory
 486  */
 487 static __be32
 488 nfsd3_proc_rmdir(struct svc_rqst *rqstp)
 489 {
 490         struct nfsd3_diropargs *argp = rqstp->rq_argp;
 491         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 492
 493         dprintk("nfsd: RMDIR(3)    %s %.*s\n",
 494                                 SVCFH_fmt(&argp->fh),
 495                                 argp->len,
 496                                 argp->name);
 497
 498         fh_copy(&resp->fh, &argp->fh);
 499         resp->status = nfsd_unlink(rqstp, &resp->fh, S_IFDIR,
 500                                    argp->name, argp->len);
 501         fh_unlock(&resp->fh);
 502         return rpc_success;
 503 }
 504
 505 static __be32
 506 nfsd3_proc_rename(struct svc_rqst *rqstp)
 507 {
 508         struct nfsd3_renameargs *argp = rqstp->rq_argp;
 509         struct nfsd3_renameres *resp = rqstp->rq_resp;
 510
 511         dprintk("nfsd: RENAME(3)   %s %.*s ->\n",
 512                                 SVCFH_fmt(&argp->ffh),
 513                                 argp->flen,
 514                                 argp->fname);
 515         dprintk("nfsd: -> %s %.*s\n",
 516                                 SVCFH_fmt(&argp->tfh),
 517                                 argp->tlen,
 518                                 argp->tname);
 519
 520         fh_copy(&resp->ffh, &argp->ffh);
 521         fh_copy(&resp->tfh, &argp->tfh);
 522         resp->status = nfsd_rename(rqstp, &resp->ffh, argp->fname, argp->flen,
 523                                    &resp->tfh, argp->tname, argp->tlen);
 524         return rpc_success;
 525 }
 526
 527 static __be32
 528 nfsd3_proc_link(struct svc_rqst *rqstp)
 529 {
 530         struct nfsd3_linkargs *argp = rqstp->rq_argp;
 531         struct nfsd3_linkres  *resp = rqstp->rq_resp;
 532
 533         dprintk("nfsd: LINK(3)     %s ->\n",
 534                                 SVCFH_fmt(&argp->ffh));
 535         dprintk("nfsd:   -> %s %.*s\n",
 536                                 SVCFH_fmt(&argp->tfh),
 537                                 argp->tlen,
 538                                 argp->tname);
 539
 540         fh_copy(&resp->fh,  &argp->ffh);
 541         fh_copy(&resp->tfh, &argp->tfh);
 542         resp->status = nfsd_link(rqstp, &resp->tfh, argp->tname, argp->tlen,
 543                                  &resp->fh);
 544         return rpc_success;
 545 }
 546
 547 static void nfsd3_init_dirlist_pages(struct svc_rqst *rqstp,
 548                                      struct nfsd3_readdirres *resp,
 549                                      u32 count)
 550 {
 551         struct xdr_buf *buf = &resp->dirlist;
 552         struct xdr_stream *xdr = &resp->xdr;
 553
 554         count = clamp(count, (u32)(XDR_UNIT * 2), svc_max_payload(rqstp));
 555
 556         memset(buf, 0, sizeof(*buf));
 557
 558         /* Reserve room for the NULL ptr & eof flag (-2 words) */
 559         buf->buflen = count - XDR_UNIT * 2;
 560         buf->pages = rqstp->rq_next_page;
 561         rqstp->rq_next_page += (buf->buflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
 562
 563         /* This is xdr_init_encode(), but it assumes that
 564          * the head kvec has already been consumed. */
 565         xdr_set_scratch_buffer(xdr, NULL, 0);
 566         xdr->buf = buf;
 567         xdr->page_ptr = buf->pages;
 568         xdr->iov = NULL;
 569         xdr->p = page_address(*buf->pages);
 570         xdr->end = (void *)xdr->p + min_t(u32, buf->buflen, PAGE_SIZE);
 571         xdr->rqst = NULL;
 572 }
 573
 574 /*
 575  * Read a portion of a directory.
 576  */
 577 static __be32
 578 nfsd3_proc_readdir(struct svc_rqst *rqstp)
 579 {
 580         struct nfsd3_readdirargs *argp = rqstp->rq_argp;
 581         struct nfsd3_readdirres  *resp = rqstp->rq_resp;
 582         loff_t          offset;
 583
 584         dprintk("nfsd: READDIR(3)  %s %d bytes at %d\n",
 585                                 SVCFH_fmt(&argp->fh),
 586                                 argp->count, (u32) argp->cookie);
 587
 588         nfsd3_init_dirlist_pages(rqstp, resp, argp->count);
 589
 590         fh_copy(&resp->fh, &argp->fh);
 591         resp->common.err = nfs_ok;
 592         resp->cookie_offset = 0;
 593         resp->rqstp = rqstp;
 594         offset = argp->cookie;
 595         resp->status = nfsd_readdir(rqstp, &resp->fh, &offset,
 596                                     &resp->common, nfs3svc_encode_entry3);
 597         memcpy(resp->verf, argp->verf, 8);
 598         nfs3svc_encode_cookie3(resp, offset);
 599
 600         /* Recycle only pages that were part of the reply */
 601         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
 602
 603         return rpc_success;
 604 }
 605
 606 /*
 607  * Read a portion of a directory, including file handles and attrs.
 608  * For now, we choose to ignore the dircount parameter.
 609  */
 610 static __be32
 611 nfsd3_proc_readdirplus(struct svc_rqst *rqstp)
 612 {
 613         struct nfsd3_readdirargs *argp = rqstp->rq_argp;
 614         struct nfsd3_readdirres  *resp = rqstp->rq_resp;
 615         loff_t  offset;
 616
 617         dprintk("nfsd: READDIR+(3) %s %d bytes at %d\n",
 618                                 SVCFH_fmt(&argp->fh),
 619                                 argp->count, (u32) argp->cookie);
 620
 621         nfsd3_init_dirlist_pages(rqstp, resp, argp->count);
 622
 623         fh_copy(&resp->fh, &argp->fh);
 624         resp->common.err = nfs_ok;
 625         resp->cookie_offset = 0;
 626         resp->rqstp = rqstp;
 627         offset = argp->cookie;
 628
 629         resp->status = fh_verify(rqstp, &resp->fh, S_IFDIR, NFSD_MAY_NOP);
 630         if (resp->status != nfs_ok)
 631                 goto out;
 632
 633         if (resp->fh.fh_export->ex_flags & NFSEXP_NOREADDIRPLUS) {
 634                 resp->status = nfserr_notsupp;
 635                 goto out;
 636         }
 637
 638         resp->status = nfsd_readdir(rqstp, &resp->fh, &offset,
 639                                     &resp->common, nfs3svc_encode_entryplus3);
 640         memcpy(resp->verf, argp->verf, 8);
 641         nfs3svc_encode_cookie3(resp, offset);
 642
 643         /* Recycle only pages that were part of the reply */
 644         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
 645
 646 out:
 647         return rpc_success;
 648 }
 649
 650 /*
 651  * Get file system stats
 652  */
 653 static __be32
 654 nfsd3_proc_fsstat(struct svc_rqst *rqstp)
 655 {
 656         struct nfsd_fhandle *argp = rqstp->rq_argp;
 657         struct nfsd3_fsstatres *resp = rqstp->rq_resp;
 658
 659         dprintk("nfsd: FSSTAT(3)   %s\n",
 660                                 SVCFH_fmt(&argp->fh));
 661
 662         resp->status = nfsd_statfs(rqstp, &argp->fh, &resp->stats, 0);
 663         fh_put(&argp->fh);
 664         return rpc_success;
 665 }
 666
 667 /*
 668  * Get file system info
 669  */
 670 static __be32
 671 nfsd3_proc_fsinfo(struct svc_rqst *rqstp)
 672 {
 673         struct nfsd_fhandle *argp = rqstp->rq_argp;
 674         struct nfsd3_fsinfores *resp = rqstp->rq_resp;
 675         u32     max_blocksize = svc_max_payload(rqstp);
 676
 677         dprintk("nfsd: FSINFO(3)   %s\n",
 678                                 SVCFH_fmt(&argp->fh));
 679
 680         resp->f_rtmax  = max_blocksize;
 681         resp->f_rtpref = max_blocksize;
 682         resp->f_rtmult = PAGE_SIZE;
 683         resp->f_wtmax  = max_blocksize;
 684         resp->f_wtpref = max_blocksize;
 685         resp->f_wtmult = PAGE_SIZE;
 686         resp->f_dtpref = max_blocksize;
 687         resp->f_maxfilesize = ~(u32) 0;
 688         resp->f_properties = NFS3_FSF_DEFAULT;
 689
 690         resp->status = fh_verify(rqstp, &argp->fh, 0,
 691                                  NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
 692
 693         /* Check special features of the file system. May request
 694          * different read/write sizes for file systems known to have
 695          * problems with large blocks */
 696         if (resp->status == nfs_ok) {
 697                 struct super_block *sb = argp->fh.fh_dentry->d_sb;
 698
 699                 /* Note that we don't care for remote fs's here */
 700                 if (sb->s_magic == MSDOS_SUPER_MAGIC) {
 701                         resp->f_properties = NFS3_FSF_BILLYBOY;
 702                 }
 703                 resp->f_maxfilesize = sb->s_maxbytes;
 704         }
 705
 706         fh_put(&argp->fh);
 707         return rpc_success;
 708 }
 709
 710 /*
 711  * Get pathconf info for the specified file
 712  */
 713 static __be32
 714 nfsd3_proc_pathconf(struct svc_rqst *rqstp)
 715 {
 716         struct nfsd_fhandle *argp = rqstp->rq_argp;
 717         struct nfsd3_pathconfres *resp = rqstp->rq_resp;
 718
 719         dprintk("nfsd: PATHCONF(3) %s\n",
 720                                 SVCFH_fmt(&argp->fh));
 721
 722         /* Set default pathconf */
 723         resp->p_link_max = 255;         /* at least */
 724         resp->p_name_max = 255;         /* at least */
 725         resp->p_no_trunc = 0;
 726         resp->p_chown_restricted = 1;
 727         resp->p_case_insensitive = 0;
 728         resp->p_case_preserving = 1;
 729
 730         resp->status = fh_verify(rqstp, &argp->fh, 0, NFSD_MAY_NOP);
 731
 732         if (resp->status == nfs_ok) {
 733                 struct super_block *sb = argp->fh.fh_dentry->d_sb;
 734
 735                 /* Note that we don't care for remote fs's here */
 736                 switch (sb->s_magic) {
 737                 case EXT2_SUPER_MAGIC:
 738                         resp->p_link_max = EXT2_LINK_MAX;
 739                         resp->p_name_max = EXT2_NAME_LEN;
 740                         break;
 741                 case MSDOS_SUPER_MAGIC:
 742                         resp->p_case_insensitive = 1;
 743                         resp->p_case_preserving  = 0;
 744                         break;
 745                 }
 746         }
 747
 748         fh_put(&argp->fh);
 749         return rpc_success;
 750 }
 751
 752 /*
 753  * Commit a file (range) to stable storage.
 754  */
 755 static __be32
 756 nfsd3_proc_commit(struct svc_rqst *rqstp)
 757 {
 758         struct nfsd3_commitargs *argp = rqstp->rq_argp;
 759         struct nfsd3_commitres *resp = rqstp->rq_resp;
 760
 761         dprintk("nfsd: COMMIT(3)   %s %u@%Lu\n",
 762                                 SVCFH_fmt(&argp->fh),
 763                                 argp->count,
 764                                 (unsigned long long) argp->offset);
 765
 766         fh_copy(&resp->fh, &argp->fh);
 767         resp->status = nfsd_commit(rqstp, &resp->fh, argp->offset,
 768                                    argp->count, resp->verf);
 769         return rpc_success;
 770 }
 771
 772
 773 /*
 774  * NFSv3 Server procedures.
 775  * Only the results of non-idempotent operations are cached.
 776  */
 777 #define nfs3svc_encode_attrstatres      nfs3svc_encode_attrstat
 778 #define nfs3svc_encode_wccstatres       nfs3svc_encode_wccstat
 779 #define nfsd3_mkdirargs                 nfsd3_createargs
 780 #define nfsd3_readdirplusargs           nfsd3_readdirargs
 781 #define nfsd3_fhandleargs               nfsd_fhandle
 782 #define nfsd3_attrstatres               nfsd3_attrstat
 783 #define nfsd3_wccstatres                nfsd3_attrstat
 784 #define nfsd3_createres                 nfsd3_diropres
 785
 786 #define ST 1            /* status*/
 787 #define FH 17           /* filehandle with length */
 788 #define AT 21           /* attributes */
 789 #define pAT (1+AT)      /* post attributes - conditional */
 790 #define WC (7+pAT)      /* WCC attributes */
 791
 792 static const struct svc_procedure nfsd_procedures3[22] = {
 793         [NFS3PROC_NULL] = {
 794                 .pc_func = nfsd3_proc_null,
 795                 .pc_decode = nfssvc_decode_voidarg,
 796                 .pc_encode = nfssvc_encode_voidres,
 797                 .pc_argsize = sizeof(struct nfsd_voidargs),
 798                 .pc_ressize = sizeof(struct nfsd_voidres),
 799                 .pc_cachetype = RC_NOCACHE,
 800                 .pc_xdrressize = ST,
 801                 .pc_name = "NULL",
 802         },
 803         [NFS3PROC_GETATTR] = {
 804                 .pc_func = nfsd3_proc_getattr,
 805                 .pc_decode = nfs3svc_decode_fhandleargs,
 806                 .pc_encode = nfs3svc_encode_getattrres,
 807                 .pc_release = nfs3svc_release_fhandle,
 808                 .pc_argsize = sizeof(struct nfsd_fhandle),
 809                 .pc_ressize = sizeof(struct nfsd3_attrstatres),
 810                 .pc_cachetype = RC_NOCACHE,
 811                 .pc_xdrressize = ST+AT,
 812                 .pc_name = "GETATTR",
 813         },
 814         [NFS3PROC_SETATTR] = {
 815                 .pc_func = nfsd3_proc_setattr,
 816                 .pc_decode = nfs3svc_decode_sattrargs,
 817                 .pc_encode = nfs3svc_encode_wccstatres,
 818                 .pc_release = nfs3svc_release_fhandle,
 819                 .pc_argsize = sizeof(struct nfsd3_sattrargs),
 820                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
 821                 .pc_cachetype = RC_REPLBUFF,
 822                 .pc_xdrressize = ST+WC,
 823                 .pc_name = "SETATTR",
 824         },
 825         [NFS3PROC_LOOKUP] = {
 826                 .pc_func = nfsd3_proc_lookup,
 827                 .pc_decode = nfs3svc_decode_diropargs,
 828                 .pc_encode = nfs3svc_encode_lookupres,
 829                 .pc_release = nfs3svc_release_fhandle2,
 830                 .pc_argsize = sizeof(struct nfsd3_diropargs),
 831                 .pc_ressize = sizeof(struct nfsd3_diropres),
 832                 .pc_cachetype = RC_NOCACHE,
 833                 .pc_xdrressize = ST+FH+pAT+pAT,
 834                 .pc_name = "LOOKUP",
 835         },
 836         [NFS3PROC_ACCESS] = {
 837                 .pc_func = nfsd3_proc_access,
 838                 .pc_decode = nfs3svc_decode_accessargs,
 839                 .pc_encode = nfs3svc_encode_accessres,
 840                 .pc_release = nfs3svc_release_fhandle,
 841                 .pc_argsize = sizeof(struct nfsd3_accessargs),
 842                 .pc_ressize = sizeof(struct nfsd3_accessres),
 843                 .pc_cachetype = RC_NOCACHE,
 844                 .pc_xdrressize = ST+pAT+1,
 845                 .pc_name = "ACCESS",
 846         },
 847         [NFS3PROC_READLINK] = {
 848                 .pc_func = nfsd3_proc_readlink,
 849                 .pc_decode = nfs3svc_decode_fhandleargs,
 850                 .pc_encode = nfs3svc_encode_readlinkres,
 851                 .pc_release = nfs3svc_release_fhandle,
 852                 .pc_argsize = sizeof(struct nfsd_fhandle),
 853                 .pc_ressize = sizeof(struct nfsd3_readlinkres),
 854                 .pc_cachetype = RC_NOCACHE,
 855                 .pc_xdrressize = ST+pAT+1+NFS3_MAXPATHLEN/4,
 856                 .pc_name = "READLINK",
 857         },
 858         [NFS3PROC_READ] = {
 859                 .pc_func = nfsd3_proc_read,
 860                 .pc_decode = nfs3svc_decode_readargs,
 861                 .pc_encode = nfs3svc_encode_readres,
 862                 .pc_release = nfs3svc_release_fhandle,
 863                 .pc_argsize = sizeof(struct nfsd3_readargs),
 864                 .pc_ressize = sizeof(struct nfsd3_readres),
 865                 .pc_cachetype = RC_NOCACHE,
 866                 .pc_xdrressize = ST+pAT+4+NFSSVC_MAXBLKSIZE/4,
 867                 .pc_name = "READ",
 868         },
 869         [NFS3PROC_WRITE] = {
 870                 .pc_func = nfsd3_proc_write,
 871                 .pc_decode = nfs3svc_decode_writeargs,
 872                 .pc_encode = nfs3svc_encode_writeres,
 873                 .pc_release = nfs3svc_release_fhandle,
 874                 .pc_argsize = sizeof(struct nfsd3_writeargs),
 875                 .pc_ressize = sizeof(struct nfsd3_writeres),
 876                 .pc_cachetype = RC_REPLBUFF,
 877                 .pc_xdrressize = ST+WC+4,
 878                 .pc_name = "WRITE",
 879         },
 880         [NFS3PROC_CREATE] = {
 881                 .pc_func = nfsd3_proc_create,
 882                 .pc_decode = nfs3svc_decode_createargs,
 883                 .pc_encode = nfs3svc_encode_createres,
 884                 .pc_release = nfs3svc_release_fhandle2,
 885                 .pc_argsize = sizeof(struct nfsd3_createargs),
 886                 .pc_ressize = sizeof(struct nfsd3_createres),
 887                 .pc_cachetype = RC_REPLBUFF,
 888                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 889                 .pc_name = "CREATE",
 890         },
 891         [NFS3PROC_MKDIR] = {
 892                 .pc_func = nfsd3_proc_mkdir,
 893                 .pc_decode = nfs3svc_decode_mkdirargs,
 894                 .pc_encode = nfs3svc_encode_createres,
 895                 .pc_release = nfs3svc_release_fhandle2,
 896                 .pc_argsize = sizeof(struct nfsd3_mkdirargs),
 897                 .pc_ressize = sizeof(struct nfsd3_createres),
 898                 .pc_cachetype = RC_REPLBUFF,
 899                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 900                 .pc_name = "MKDIR",
 901         },
 902         [NFS3PROC_SYMLINK] = {
 903                 .pc_func = nfsd3_proc_symlink,
 904                 .pc_decode = nfs3svc_decode_symlinkargs,
 905                 .pc_encode = nfs3svc_encode_createres,
 906                 .pc_release = nfs3svc_release_fhandle2,
 907                 .pc_argsize = sizeof(struct nfsd3_symlinkargs),
 908                 .pc_ressize = sizeof(struct nfsd3_createres),
 909                 .pc_cachetype = RC_REPLBUFF,
 910                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 911                 .pc_name = "SYMLINK",
 912         },
 913         [NFS3PROC_MKNOD] = {
 914                 .pc_func = nfsd3_proc_mknod,
 915                 .pc_decode = nfs3svc_decode_mknodargs,
 916                 .pc_encode = nfs3svc_encode_createres,
 917                 .pc_release = nfs3svc_release_fhandle2,
 918                 .pc_argsize = sizeof(struct nfsd3_mknodargs),
 919                 .pc_ressize = sizeof(struct nfsd3_createres),
 920                 .pc_cachetype = RC_REPLBUFF,
 921                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 922                 .pc_name = "MKNOD",
 923         },
 924         [NFS3PROC_REMOVE] = {
 925                 .pc_func = nfsd3_proc_remove,
 926                 .pc_decode = nfs3svc_decode_diropargs,
 927                 .pc_encode = nfs3svc_encode_wccstatres,
 928                 .pc_release = nfs3svc_release_fhandle,
 929                 .pc_argsize = sizeof(struct nfsd3_diropargs),
 930                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
 931                 .pc_cachetype = RC_REPLBUFF,
 932                 .pc_xdrressize = ST+WC,
 933                 .pc_name = "REMOVE",
 934         },
 935         [NFS3PROC_RMDIR] = {
 936                 .pc_func = nfsd3_proc_rmdir,
 937                 .pc_decode = nfs3svc_decode_diropargs,
 938                 .pc_encode = nfs3svc_encode_wccstatres,
 939                 .pc_release = nfs3svc_release_fhandle,
 940                 .pc_argsize = sizeof(struct nfsd3_diropargs),
 941                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
 942                 .pc_cachetype = RC_REPLBUFF,
 943                 .pc_xdrressize = ST+WC,
 944                 .pc_name = "RMDIR",
 945         },
 946         [NFS3PROC_RENAME] = {
 947                 .pc_func = nfsd3_proc_rename,
 948                 .pc_decode = nfs3svc_decode_renameargs,
 949                 .pc_encode = nfs3svc_encode_renameres,
 950                 .pc_release = nfs3svc_release_fhandle2,
 951                 .pc_argsize = sizeof(struct nfsd3_renameargs),
 952                 .pc_ressize = sizeof(struct nfsd3_renameres),
 953                 .pc_cachetype = RC_REPLBUFF,
 954                 .pc_xdrressize = ST+WC+WC,
 955                 .pc_name = "RENAME",
 956         },
 957         [NFS3PROC_LINK] = {
 958                 .pc_func = nfsd3_proc_link,
 959                 .pc_decode = nfs3svc_decode_linkargs,
 960                 .pc_encode = nfs3svc_encode_linkres,
 961                 .pc_release = nfs3svc_release_fhandle2,
 962                 .pc_argsize = sizeof(struct nfsd3_linkargs),
 963                 .pc_ressize = sizeof(struct nfsd3_linkres),
 964                 .pc_cachetype = RC_REPLBUFF,
 965                 .pc_xdrressize = ST+pAT+WC,
 966                 .pc_name = "LINK",
 967         },
 968         [NFS3PROC_READDIR] = {
 969                 .pc_func = nfsd3_proc_readdir,
 970                 .pc_decode = nfs3svc_decode_readdirargs,
 971                 .pc_encode = nfs3svc_encode_readdirres,
 972                 .pc_release = nfs3svc_release_fhandle,
 973                 .pc_argsize = sizeof(struct nfsd3_readdirargs),
 974                 .pc_ressize = sizeof(struct nfsd3_readdirres),
 975                 .pc_cachetype = RC_NOCACHE,
 976                 .pc_name = "READDIR",
 977         },
 978         [NFS3PROC_READDIRPLUS] = {
 979                 .pc_func = nfsd3_proc_readdirplus,
 980                 .pc_decode = nfs3svc_decode_readdirplusargs,
 981                 .pc_encode = nfs3svc_encode_readdirres,
 982                 .pc_release = nfs3svc_release_fhandle,
 983                 .pc_argsize = sizeof(struct nfsd3_readdirplusargs),
 984                 .pc_ressize = sizeof(struct nfsd3_readdirres),
 985                 .pc_cachetype = RC_NOCACHE,
 986                 .pc_name = "READDIRPLUS",
 987         },
 988         [NFS3PROC_FSSTAT] = {
 989                 .pc_func = nfsd3_proc_fsstat,
 990                 .pc_decode = nfs3svc_decode_fhandleargs,
 991                 .pc_encode = nfs3svc_encode_fsstatres,
 992                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 993                 .pc_ressize = sizeof(struct nfsd3_fsstatres),
 994                 .pc_cachetype = RC_NOCACHE,
 995                 .pc_xdrressize = ST+pAT+2*6+1,
 996                 .pc_name = "FSSTAT",
 997         },
 998         [NFS3PROC_FSINFO] = {
 999                 .pc_func = nfsd3_proc_fsinfo,
1000                 .pc_decode = nfs3svc_decode_fhandleargs,
1001                 .pc_encode = nfs3svc_encode_fsinfores,
1002                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
1003                 .pc_ressize = sizeof(struct nfsd3_fsinfores),
1004                 .pc_cachetype = RC_NOCACHE,
1005                 .pc_xdrressize = ST+pAT+12,
1006                 .pc_name = "FSINFO",
1007         },
1008         [NFS3PROC_PATHCONF] = {
1009                 .pc_func = nfsd3_proc_pathconf,
1010                 .pc_decode = nfs3svc_decode_fhandleargs,
1011                 .pc_encode = nfs3svc_encode_pathconfres,
1012                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
1013                 .pc_ressize = sizeof(struct nfsd3_pathconfres),
1014                 .pc_cachetype = RC_NOCACHE,
1015                 .pc_xdrressize = ST+pAT+6,
1016                 .pc_name = "PATHCONF",
1017         },
1018         [NFS3PROC_COMMIT] = {
1019                 .pc_func = nfsd3_proc_commit,
1020                 .pc_decode = nfs3svc_decode_commitargs,
1021                 .pc_encode = nfs3svc_encode_commitres,
1022                 .pc_release = nfs3svc_release_fhandle,
1023                 .pc_argsize = sizeof(struct nfsd3_commitargs),
1024                 .pc_ressize = sizeof(struct nfsd3_commitres),
1025                 .pc_cachetype = RC_NOCACHE,
1026                 .pc_xdrressize = ST+WC+2,
1027                 .pc_name = "COMMIT",
1028         },
1029 };
1030
1031 static unsigned int nfsd_count3[ARRAY_SIZE(nfsd_procedures3)];
1032 const struct svc_version nfsd_version3 = {
1033         .vs_vers        = 3,
1034         .vs_nproc       = 22,
1035         .vs_proc        = nfsd_procedures3,
1036         .vs_dispatch    = nfsd_dispatch,
1037         .vs_count       = nfsd_count3,
1038         .vs_xdrsize     = NFS3_SVC_XDRSIZE,
1039 };