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