1 /* 2 * nfsproc2.c Process version 2 NFS requests. 3 * linux/fs/nfsd/nfs2proc.c 4 * 5 * Process version 2 NFS requests. 6 * 7 * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de> 8 */ 9 10 #include <linux/linkage.h> 11 #include <linux/time.h> 12 #include <linux/errno.h> 13 #include <linux/fs.h> 14 #include <linux/stat.h> 15 #include <linux/fcntl.h> 16 #include <linux/net.h> 17 #include <linux/in.h> 18 #include <linux/namei.h> 19 #include <linux/unistd.h> 20 #include <linux/slab.h> 21 22 #include <linux/sunrpc/clnt.h> 23 #include <linux/sunrpc/svc.h> 24 #include <linux/nfsd/nfsd.h> 25 #include <linux/nfsd/cache.h> 26 #include <linux/nfsd/xdr.h> 27 28 typedef struct svc_rqst svc_rqst; 29 typedef struct svc_buf svc_buf; 30 31 #define NFSDDBG_FACILITY NFSDDBG_PROC 32 33 34 static __be32 35 nfsd_proc_null(struct svc_rqst *rqstp, void *argp, void *resp) 36 { 37 return nfs_ok; 38 } 39 40 static __be32 41 nfsd_return_attrs(__be32 err, struct nfsd_attrstat *resp) 42 { 43 if (err) return err; 44 return nfserrno(vfs_getattr(resp->fh.fh_export->ex_path.mnt, 45 resp->fh.fh_dentry, 46 &resp->stat)); 47 } 48 static __be32 49 nfsd_return_dirop(__be32 err, struct nfsd_diropres *resp) 50 { 51 if (err) return err; 52 return nfserrno(vfs_getattr(resp->fh.fh_export->ex_path.mnt, 53 resp->fh.fh_dentry, 54 &resp->stat)); 55 } 56 /* 57 * Get a file's attributes 58 * N.B. After this call resp->fh needs an fh_put 59 */ 60 static __be32 61 nfsd_proc_getattr(struct svc_rqst *rqstp, struct nfsd_fhandle *argp, 62 struct nfsd_attrstat *resp) 63 { 64 __be32 nfserr; 65 dprintk("nfsd: GETATTR %s\n", SVCFH_fmt(&argp->fh)); 66 67 fh_copy(&resp->fh, &argp->fh); 68 nfserr = fh_verify(rqstp, &resp->fh, 0, 69 NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT); 70 return nfsd_return_attrs(nfserr, resp); 71 } 72 73 /* 74 * Set a file's attributes 75 * N.B. After this call resp->fh needs an fh_put 76 */ 77 static __be32 78 nfsd_proc_setattr(struct svc_rqst *rqstp, struct nfsd_sattrargs *argp, 79 struct nfsd_attrstat *resp) 80 { 81 __be32 nfserr; 82 dprintk("nfsd: SETATTR %s, valid=%x, size=%ld\n", 83 SVCFH_fmt(&argp->fh), 84 argp->attrs.ia_valid, (long) argp->attrs.ia_size); 85 86 fh_copy(&resp->fh, &argp->fh); 87 nfserr = nfsd_setattr(rqstp, &resp->fh, &argp->attrs,0, (time_t)0); 88 return nfsd_return_attrs(nfserr, resp); 89 } 90 91 /* 92 * Look up a path name component 93 * Note: the dentry in the resp->fh may be negative if the file 94 * doesn't exist yet. 95 * N.B. After this call resp->fh needs an fh_put 96 */ 97 static __be32 98 nfsd_proc_lookup(struct svc_rqst *rqstp, struct nfsd_diropargs *argp, 99 struct nfsd_diropres *resp) 100 { 101 __be32 nfserr; 102 103 dprintk("nfsd: LOOKUP %s %.*s\n", 104 SVCFH_fmt(&argp->fh), argp->len, argp->name); 105 106 fh_init(&resp->fh, NFS_FHSIZE); 107 nfserr = nfsd_lookup(rqstp, &argp->fh, argp->name, argp->len, 108 &resp->fh); 109 110 fh_put(&argp->fh); 111 return nfsd_return_dirop(nfserr, resp); 112 } 113 114 /* 115 * Read a symlink. 116 */ 117 static __be32 118 nfsd_proc_readlink(struct svc_rqst *rqstp, struct nfsd_readlinkargs *argp, 119 struct nfsd_readlinkres *resp) 120 { 121 __be32 nfserr; 122 123 dprintk("nfsd: READLINK %s\n", SVCFH_fmt(&argp->fh)); 124 125 /* Read the symlink. */ 126 resp->len = NFS_MAXPATHLEN; 127 nfserr = nfsd_readlink(rqstp, &argp->fh, argp->buffer, &resp->len); 128 129 fh_put(&argp->fh); 130 return nfserr; 131 } 132 133 /* 134 * Read a portion of a file. 135 * N.B. After this call resp->fh needs an fh_put 136 */ 137 static __be32 138 nfsd_proc_read(struct svc_rqst *rqstp, struct nfsd_readargs *argp, 139 struct nfsd_readres *resp) 140 { 141 __be32 nfserr; 142 143 dprintk("nfsd: READ %s %d bytes at %d\n", 144 SVCFH_fmt(&argp->fh), 145 argp->count, argp->offset); 146 147 /* Obtain buffer pointer for payload. 19 is 1 word for 148 * status, 17 words for fattr, and 1 word for the byte count. 149 */ 150 151 if (NFSSVC_MAXBLKSIZE_V2 < argp->count) { 152 char buf[RPC_MAX_ADDRBUFLEN]; 153 printk(KERN_NOTICE 154 "oversized read request from %s (%d bytes)\n", 155 svc_print_addr(rqstp, buf, sizeof(buf)), 156 argp->count); 157 argp->count = NFSSVC_MAXBLKSIZE_V2; 158 } 159 svc_reserve_auth(rqstp, (19<<2) + argp->count + 4); 160 161 resp->count = argp->count; 162 nfserr = nfsd_read(rqstp, fh_copy(&resp->fh, &argp->fh), NULL, 163 argp->offset, 164 rqstp->rq_vec, argp->vlen, 165 &resp->count); 166 167 if (nfserr) return nfserr; 168 return nfserrno(vfs_getattr(resp->fh.fh_export->ex_path.mnt, 169 resp->fh.fh_dentry, 170 &resp->stat)); 171 } 172 173 /* 174 * Write data to a file 175 * N.B. After this call resp->fh needs an fh_put 176 */ 177 static __be32 178 nfsd_proc_write(struct svc_rqst *rqstp, struct nfsd_writeargs *argp, 179 struct nfsd_attrstat *resp) 180 { 181 __be32 nfserr; 182 int stable = 1; 183 unsigned long cnt = argp->len; 184 185 dprintk("nfsd: WRITE %s %d bytes at %d\n", 186 SVCFH_fmt(&argp->fh), 187 argp->len, argp->offset); 188 189 nfserr = nfsd_write(rqstp, fh_copy(&resp->fh, &argp->fh), NULL, 190 argp->offset, 191 rqstp->rq_vec, argp->vlen, 192 &cnt, 193 &stable); 194 return nfsd_return_attrs(nfserr, resp); 195 } 196 197 /* 198 * CREATE processing is complicated. The keyword here is `overloaded.' 199 * The parent directory is kept locked between the check for existence 200 * and the actual create() call in compliance with VFS protocols. 201 * N.B. After this call _both_ argp->fh and resp->fh need an fh_put 202 */ 203 static __be32 204 nfsd_proc_create(struct svc_rqst *rqstp, struct nfsd_createargs *argp, 205 struct nfsd_diropres *resp) 206 { 207 svc_fh *dirfhp = &argp->fh; 208 svc_fh *newfhp = &resp->fh; 209 struct iattr *attr = &argp->attrs; 210 struct inode *inode; 211 struct dentry *dchild; 212 int type, mode; 213 __be32 nfserr; 214 dev_t rdev = 0, wanted = new_decode_dev(attr->ia_size); 215 216 dprintk("nfsd: CREATE %s %.*s\n", 217 SVCFH_fmt(dirfhp), argp->len, argp->name); 218 219 /* First verify the parent file handle */ 220 nfserr = fh_verify(rqstp, dirfhp, S_IFDIR, NFSD_MAY_EXEC); 221 if (nfserr) 222 goto done; /* must fh_put dirfhp even on error */ 223 224 /* Check for NFSD_MAY_WRITE in nfsd_create if necessary */ 225 226 nfserr = nfserr_acces; 227 if (!argp->len) 228 goto done; 229 nfserr = nfserr_exist; 230 if (isdotent(argp->name, argp->len)) 231 goto done; 232 fh_lock_nested(dirfhp, I_MUTEX_PARENT); 233 dchild = lookup_one_len(argp->name, dirfhp->fh_dentry, argp->len); 234 if (IS_ERR(dchild)) { 235 nfserr = nfserrno(PTR_ERR(dchild)); 236 goto out_unlock; 237 } 238 fh_init(newfhp, NFS_FHSIZE); 239 nfserr = fh_compose(newfhp, dirfhp->fh_export, dchild, dirfhp); 240 if (!nfserr && !dchild->d_inode) 241 nfserr = nfserr_noent; 242 dput(dchild); 243 if (nfserr) { 244 if (nfserr != nfserr_noent) 245 goto out_unlock; 246 /* 247 * If the new file handle wasn't verified, we can't tell 248 * whether the file exists or not. Time to bail ... 249 */ 250 nfserr = nfserr_acces; 251 if (!newfhp->fh_dentry) { 252 printk(KERN_WARNING 253 "nfsd_proc_create: file handle not verified\n"); 254 goto out_unlock; 255 } 256 } 257 258 inode = newfhp->fh_dentry->d_inode; 259 260 /* Unfudge the mode bits */ 261 if (attr->ia_valid & ATTR_MODE) { 262 type = attr->ia_mode & S_IFMT; 263 mode = attr->ia_mode & ~S_IFMT; 264 if (!type) { 265 /* no type, so if target exists, assume same as that, 266 * else assume a file */ 267 if (inode) { 268 type = inode->i_mode & S_IFMT; 269 switch(type) { 270 case S_IFCHR: 271 case S_IFBLK: 272 /* reserve rdev for later checking */ 273 rdev = inode->i_rdev; 274 attr->ia_valid |= ATTR_SIZE; 275 276 /* FALLTHROUGH */ 277 case S_IFIFO: 278 /* this is probably a permission check.. 279 * at least IRIX implements perm checking on 280 * echo thing > device-special-file-or-pipe 281 * by doing a CREATE with type==0 282 */ 283 nfserr = nfsd_permission(rqstp, 284 newfhp->fh_export, 285 newfhp->fh_dentry, 286 NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS); 287 if (nfserr && nfserr != nfserr_rofs) 288 goto out_unlock; 289 } 290 } else 291 type = S_IFREG; 292 } 293 } else if (inode) { 294 type = inode->i_mode & S_IFMT; 295 mode = inode->i_mode & ~S_IFMT; 296 } else { 297 type = S_IFREG; 298 mode = 0; /* ??? */ 299 } 300 301 attr->ia_valid |= ATTR_MODE; 302 attr->ia_mode = mode; 303 304 /* Special treatment for non-regular files according to the 305 * gospel of sun micro 306 */ 307 if (type != S_IFREG) { 308 int is_borc = 0; 309 if (type != S_IFBLK && type != S_IFCHR) { 310 rdev = 0; 311 } else if (type == S_IFCHR && !(attr->ia_valid & ATTR_SIZE)) { 312 /* If you think you've seen the worst, grok this. */ 313 type = S_IFIFO; 314 } else { 315 /* Okay, char or block special */ 316 is_borc = 1; 317 if (!rdev) 318 rdev = wanted; 319 } 320 321 /* we've used the SIZE information, so discard it */ 322 attr->ia_valid &= ~ATTR_SIZE; 323 324 /* Make sure the type and device matches */ 325 nfserr = nfserr_exist; 326 if (inode && type != (inode->i_mode & S_IFMT)) 327 goto out_unlock; 328 } 329 330 nfserr = 0; 331 if (!inode) { 332 /* File doesn't exist. Create it and set attrs */ 333 nfserr = nfsd_create(rqstp, dirfhp, argp->name, argp->len, 334 attr, type, rdev, newfhp); 335 } else if (type == S_IFREG) { 336 dprintk("nfsd: existing %s, valid=%x, size=%ld\n", 337 argp->name, attr->ia_valid, (long) attr->ia_size); 338 /* File already exists. We ignore all attributes except 339 * size, so that creat() behaves exactly like 340 * open(..., O_CREAT|O_TRUNC|O_WRONLY). 341 */ 342 attr->ia_valid &= ATTR_SIZE; 343 if (attr->ia_valid) 344 nfserr = nfsd_setattr(rqstp, newfhp, attr, 0, (time_t)0); 345 } 346 347 out_unlock: 348 /* We don't really need to unlock, as fh_put does it. */ 349 fh_unlock(dirfhp); 350 351 done: 352 fh_put(dirfhp); 353 return nfsd_return_dirop(nfserr, resp); 354 } 355 356 static __be32 357 nfsd_proc_remove(struct svc_rqst *rqstp, struct nfsd_diropargs *argp, 358 void *resp) 359 { 360 __be32 nfserr; 361 362 dprintk("nfsd: REMOVE %s %.*s\n", SVCFH_fmt(&argp->fh), 363 argp->len, argp->name); 364 365 /* Unlink. -SIFDIR means file must not be a directory */ 366 nfserr = nfsd_unlink(rqstp, &argp->fh, -S_IFDIR, argp->name, argp->len); 367 fh_put(&argp->fh); 368 return nfserr; 369 } 370 371 static __be32 372 nfsd_proc_rename(struct svc_rqst *rqstp, struct nfsd_renameargs *argp, 373 void *resp) 374 { 375 __be32 nfserr; 376 377 dprintk("nfsd: RENAME %s %.*s -> \n", 378 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname); 379 dprintk("nfsd: -> %s %.*s\n", 380 SVCFH_fmt(&argp->tfh), argp->tlen, argp->tname); 381 382 nfserr = nfsd_rename(rqstp, &argp->ffh, argp->fname, argp->flen, 383 &argp->tfh, argp->tname, argp->tlen); 384 fh_put(&argp->ffh); 385 fh_put(&argp->tfh); 386 return nfserr; 387 } 388 389 static __be32 390 nfsd_proc_link(struct svc_rqst *rqstp, struct nfsd_linkargs *argp, 391 void *resp) 392 { 393 __be32 nfserr; 394 395 dprintk("nfsd: LINK %s ->\n", 396 SVCFH_fmt(&argp->ffh)); 397 dprintk("nfsd: %s %.*s\n", 398 SVCFH_fmt(&argp->tfh), 399 argp->tlen, 400 argp->tname); 401 402 nfserr = nfsd_link(rqstp, &argp->tfh, argp->tname, argp->tlen, 403 &argp->ffh); 404 fh_put(&argp->ffh); 405 fh_put(&argp->tfh); 406 return nfserr; 407 } 408 409 static __be32 410 nfsd_proc_symlink(struct svc_rqst *rqstp, struct nfsd_symlinkargs *argp, 411 void *resp) 412 { 413 struct svc_fh newfh; 414 __be32 nfserr; 415 416 dprintk("nfsd: SYMLINK %s %.*s -> %.*s\n", 417 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname, 418 argp->tlen, argp->tname); 419 420 fh_init(&newfh, NFS_FHSIZE); 421 /* 422 * Create the link, look up new file and set attrs. 423 */ 424 nfserr = nfsd_symlink(rqstp, &argp->ffh, argp->fname, argp->flen, 425 argp->tname, argp->tlen, 426 &newfh, &argp->attrs); 427 428 429 fh_put(&argp->ffh); 430 fh_put(&newfh); 431 return nfserr; 432 } 433 434 /* 435 * Make directory. This operation is not idempotent. 436 * N.B. After this call resp->fh needs an fh_put 437 */ 438 static __be32 439 nfsd_proc_mkdir(struct svc_rqst *rqstp, struct nfsd_createargs *argp, 440 struct nfsd_diropres *resp) 441 { 442 __be32 nfserr; 443 444 dprintk("nfsd: MKDIR %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name); 445 446 if (resp->fh.fh_dentry) { 447 printk(KERN_WARNING 448 "nfsd_proc_mkdir: response already verified??\n"); 449 } 450 451 argp->attrs.ia_valid &= ~ATTR_SIZE; 452 fh_init(&resp->fh, NFS_FHSIZE); 453 nfserr = nfsd_create(rqstp, &argp->fh, argp->name, argp->len, 454 &argp->attrs, S_IFDIR, 0, &resp->fh); 455 fh_put(&argp->fh); 456 return nfsd_return_dirop(nfserr, resp); 457 } 458 459 /* 460 * Remove a directory 461 */ 462 static __be32 463 nfsd_proc_rmdir(struct svc_rqst *rqstp, struct nfsd_diropargs *argp, 464 void *resp) 465 { 466 __be32 nfserr; 467 468 dprintk("nfsd: RMDIR %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name); 469 470 nfserr = nfsd_unlink(rqstp, &argp->fh, S_IFDIR, argp->name, argp->len); 471 fh_put(&argp->fh); 472 return nfserr; 473 } 474 475 /* 476 * Read a portion of a directory. 477 */ 478 static __be32 479 nfsd_proc_readdir(struct svc_rqst *rqstp, struct nfsd_readdirargs *argp, 480 struct nfsd_readdirres *resp) 481 { 482 int count; 483 __be32 nfserr; 484 loff_t offset; 485 486 dprintk("nfsd: READDIR %s %d bytes at %d\n", 487 SVCFH_fmt(&argp->fh), 488 argp->count, argp->cookie); 489 490 /* Shrink to the client read size */ 491 count = (argp->count >> 2) - 2; 492 493 /* Make sure we've room for the NULL ptr & eof flag */ 494 count -= 2; 495 if (count < 0) 496 count = 0; 497 498 resp->buffer = argp->buffer; 499 resp->offset = NULL; 500 resp->buflen = count; 501 resp->common.err = nfs_ok; 502 /* Read directory and encode entries on the fly */ 503 offset = argp->cookie; 504 nfserr = nfsd_readdir(rqstp, &argp->fh, &offset, 505 &resp->common, nfssvc_encode_entry); 506 507 resp->count = resp->buffer - argp->buffer; 508 if (resp->offset) 509 *resp->offset = htonl(offset); 510 511 fh_put(&argp->fh); 512 return nfserr; 513 } 514 515 /* 516 * Get file system info 517 */ 518 static __be32 519 nfsd_proc_statfs(struct svc_rqst * rqstp, struct nfsd_fhandle *argp, 520 struct nfsd_statfsres *resp) 521 { 522 __be32 nfserr; 523 524 dprintk("nfsd: STATFS %s\n", SVCFH_fmt(&argp->fh)); 525 526 nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats, 527 NFSD_MAY_BYPASS_GSS_ON_ROOT); 528 fh_put(&argp->fh); 529 return nfserr; 530 } 531 532 /* 533 * NFSv2 Server procedures. 534 * Only the results of non-idempotent operations are cached. 535 */ 536 #define nfsd_proc_none NULL 537 #define nfssvc_release_none NULL 538 struct nfsd_void { int dummy; }; 539 540 #define PROC(name, argt, rest, relt, cache, respsize) \ 541 { (svc_procfunc) nfsd_proc_##name, \ 542 (kxdrproc_t) nfssvc_decode_##argt, \ 543 (kxdrproc_t) nfssvc_encode_##rest, \ 544 (kxdrproc_t) nfssvc_release_##relt, \ 545 sizeof(struct nfsd_##argt), \ 546 sizeof(struct nfsd_##rest), \ 547 0, \ 548 cache, \ 549 respsize, \ 550 } 551 552 #define ST 1 /* status */ 553 #define FH 8 /* filehandle */ 554 #define AT 18 /* attributes */ 555 556 static struct svc_procedure nfsd_procedures2[18] = { 557 PROC(null, void, void, none, RC_NOCACHE, ST), 558 PROC(getattr, fhandle, attrstat, fhandle, RC_NOCACHE, ST+AT), 559 PROC(setattr, sattrargs, attrstat, fhandle, RC_REPLBUFF, ST+AT), 560 PROC(none, void, void, none, RC_NOCACHE, ST), 561 PROC(lookup, diropargs, diropres, fhandle, RC_NOCACHE, ST+FH+AT), 562 PROC(readlink, readlinkargs, readlinkres, none, RC_NOCACHE, ST+1+NFS_MAXPATHLEN/4), 563 PROC(read, readargs, readres, fhandle, RC_NOCACHE, ST+AT+1+NFSSVC_MAXBLKSIZE_V2/4), 564 PROC(none, void, void, none, RC_NOCACHE, ST), 565 PROC(write, writeargs, attrstat, fhandle, RC_REPLBUFF, ST+AT), 566 PROC(create, createargs, diropres, fhandle, RC_REPLBUFF, ST+FH+AT), 567 PROC(remove, diropargs, void, none, RC_REPLSTAT, ST), 568 PROC(rename, renameargs, void, none, RC_REPLSTAT, ST), 569 PROC(link, linkargs, void, none, RC_REPLSTAT, ST), 570 PROC(symlink, symlinkargs, void, none, RC_REPLSTAT, ST), 571 PROC(mkdir, createargs, diropres, fhandle, RC_REPLBUFF, ST+FH+AT), 572 PROC(rmdir, diropargs, void, none, RC_REPLSTAT, ST), 573 PROC(readdir, readdirargs, readdirres, none, RC_NOCACHE, 0), 574 PROC(statfs, fhandle, statfsres, none, RC_NOCACHE, ST+5), 575 }; 576 577 578 struct svc_version nfsd_version2 = { 579 .vs_vers = 2, 580 .vs_nproc = 18, 581 .vs_proc = nfsd_procedures2, 582 .vs_dispatch = nfsd_dispatch, 583 .vs_xdrsize = NFS2_SVC_XDRSIZE, 584 }; 585 586 /* 587 * Map errnos to NFS errnos. 588 */ 589 __be32 590 nfserrno (int errno) 591 { 592 static struct { 593 __be32 nfserr; 594 int syserr; 595 } nfs_errtbl[] = { 596 { nfs_ok, 0 }, 597 { nfserr_perm, -EPERM }, 598 { nfserr_noent, -ENOENT }, 599 { nfserr_io, -EIO }, 600 { nfserr_nxio, -ENXIO }, 601 { nfserr_acces, -EACCES }, 602 { nfserr_exist, -EEXIST }, 603 { nfserr_xdev, -EXDEV }, 604 { nfserr_mlink, -EMLINK }, 605 { nfserr_nodev, -ENODEV }, 606 { nfserr_notdir, -ENOTDIR }, 607 { nfserr_isdir, -EISDIR }, 608 { nfserr_inval, -EINVAL }, 609 { nfserr_fbig, -EFBIG }, 610 { nfserr_nospc, -ENOSPC }, 611 { nfserr_rofs, -EROFS }, 612 { nfserr_mlink, -EMLINK }, 613 { nfserr_nametoolong, -ENAMETOOLONG }, 614 { nfserr_notempty, -ENOTEMPTY }, 615 #ifdef EDQUOT 616 { nfserr_dquot, -EDQUOT }, 617 #endif 618 { nfserr_stale, -ESTALE }, 619 { nfserr_jukebox, -ETIMEDOUT }, 620 { nfserr_jukebox, -ERESTARTSYS }, 621 { nfserr_dropit, -EAGAIN }, 622 { nfserr_dropit, -ENOMEM }, 623 { nfserr_badname, -ESRCH }, 624 { nfserr_io, -ETXTBSY }, 625 { nfserr_notsupp, -EOPNOTSUPP }, 626 { nfserr_toosmall, -ETOOSMALL }, 627 }; 628 int i; 629 630 for (i = 0; i < ARRAY_SIZE(nfs_errtbl); i++) { 631 if (nfs_errtbl[i].syserr == errno) 632 return nfs_errtbl[i].nfserr; 633 } 634 printk (KERN_INFO "nfsd: non-standard errno: %d\n", errno); 635 return nfserr_io; 636 } 637 638