1 #define MSNFS /* HACK HACK */ 2 /* 3 * linux/fs/nfsd/vfs.c 4 * 5 * File operations used by nfsd. Some of these have been ripped from 6 * other parts of the kernel because they weren't exported, others 7 * are partial duplicates with added or changed functionality. 8 * 9 * Note that several functions dget() the dentry upon which they want 10 * to act, most notably those that create directory entries. Response 11 * dentry's are dput()'d if necessary in the release callback. 12 * So if you notice code paths that apparently fail to dput() the 13 * dentry, don't worry--they have been taken care of. 14 * 15 * Copyright (C) 1995-1999 Olaf Kirch <okir@monad.swb.de> 16 * Zerocpy NFS support (C) 2002 Hirokazu Takahashi <taka@valinux.co.jp> 17 */ 18 19 #include <linux/string.h> 20 #include <linux/time.h> 21 #include <linux/errno.h> 22 #include <linux/fs.h> 23 #include <linux/file.h> 24 #include <linux/mount.h> 25 #include <linux/major.h> 26 #include <linux/splice.h> 27 #include <linux/proc_fs.h> 28 #include <linux/stat.h> 29 #include <linux/fcntl.h> 30 #include <linux/net.h> 31 #include <linux/unistd.h> 32 #include <linux/slab.h> 33 #include <linux/pagemap.h> 34 #include <linux/in.h> 35 #include <linux/module.h> 36 #include <linux/namei.h> 37 #include <linux/vfs.h> 38 #include <linux/delay.h> 39 #include <linux/sunrpc/svc.h> 40 #include <linux/nfsd/nfsd.h> 41 #ifdef CONFIG_NFSD_V3 42 #include <linux/nfs3.h> 43 #include <linux/nfsd/xdr3.h> 44 #endif /* CONFIG_NFSD_V3 */ 45 #include <linux/nfsd/nfsfh.h> 46 #include <linux/quotaops.h> 47 #include <linux/fsnotify.h> 48 #include <linux/posix_acl.h> 49 #include <linux/posix_acl_xattr.h> 50 #include <linux/xattr.h> 51 #ifdef CONFIG_NFSD_V4 52 #include <linux/nfs4.h> 53 #include <linux/nfs4_acl.h> 54 #include <linux/nfsd_idmap.h> 55 #include <linux/security.h> 56 #endif /* CONFIG_NFSD_V4 */ 57 #include <linux/jhash.h> 58 59 #include <asm/uaccess.h> 60 61 #define NFSDDBG_FACILITY NFSDDBG_FILEOP 62 63 64 /* 65 * This is a cache of readahead params that help us choose the proper 66 * readahead strategy. Initially, we set all readahead parameters to 0 67 * and let the VFS handle things. 68 * If you increase the number of cached files very much, you'll need to 69 * add a hash table here. 70 */ 71 struct raparms { 72 struct raparms *p_next; 73 unsigned int p_count; 74 ino_t p_ino; 75 dev_t p_dev; 76 int p_set; 77 struct file_ra_state p_ra; 78 unsigned int p_hindex; 79 }; 80 81 struct raparm_hbucket { 82 struct raparms *pb_head; 83 spinlock_t pb_lock; 84 } ____cacheline_aligned_in_smp; 85 86 static struct raparms * raparml; 87 #define RAPARM_HASH_BITS 4 88 #define RAPARM_HASH_SIZE (1<<RAPARM_HASH_BITS) 89 #define RAPARM_HASH_MASK (RAPARM_HASH_SIZE-1) 90 static struct raparm_hbucket raparm_hash[RAPARM_HASH_SIZE]; 91 92 /* 93 * Called from nfsd_lookup and encode_dirent. Check if we have crossed 94 * a mount point. 95 * Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged, 96 * or nfs_ok having possibly changed *dpp and *expp 97 */ 98 int 99 nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp, 100 struct svc_export **expp) 101 { 102 struct svc_export *exp = *expp, *exp2 = NULL; 103 struct dentry *dentry = *dpp; 104 struct vfsmount *mnt = mntget(exp->ex_path.mnt); 105 struct dentry *mounts = dget(dentry); 106 int err = 0; 107 108 while (follow_down(&mnt,&mounts)&&d_mountpoint(mounts)); 109 110 exp2 = rqst_exp_get_by_name(rqstp, mnt, mounts); 111 if (IS_ERR(exp2)) { 112 if (PTR_ERR(exp2) != -ENOENT) 113 err = PTR_ERR(exp2); 114 dput(mounts); 115 mntput(mnt); 116 goto out; 117 } 118 if ((exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2)) { 119 /* successfully crossed mount point */ 120 exp_put(exp); 121 *expp = exp2; 122 dput(dentry); 123 *dpp = mounts; 124 } else { 125 exp_put(exp2); 126 dput(mounts); 127 } 128 mntput(mnt); 129 out: 130 return err; 131 } 132 133 __be32 134 nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp, 135 const char *name, unsigned int len, 136 struct svc_export **exp_ret, struct dentry **dentry_ret) 137 { 138 struct svc_export *exp; 139 struct dentry *dparent; 140 struct dentry *dentry; 141 __be32 err; 142 int host_err; 143 144 dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name); 145 146 /* Obtain dentry and export. */ 147 err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); 148 if (err) 149 return err; 150 151 dparent = fhp->fh_dentry; 152 exp = fhp->fh_export; 153 exp_get(exp); 154 155 /* Lookup the name, but don't follow links */ 156 if (isdotent(name, len)) { 157 if (len==1) 158 dentry = dget(dparent); 159 else if (dparent != exp->ex_path.dentry) 160 dentry = dget_parent(dparent); 161 else if (!EX_NOHIDE(exp)) 162 dentry = dget(dparent); /* .. == . just like at / */ 163 else { 164 /* checking mountpoint crossing is very different when stepping up */ 165 struct svc_export *exp2 = NULL; 166 struct dentry *dp; 167 struct vfsmount *mnt = mntget(exp->ex_path.mnt); 168 dentry = dget(dparent); 169 while(dentry == mnt->mnt_root && follow_up(&mnt, &dentry)) 170 ; 171 dp = dget_parent(dentry); 172 dput(dentry); 173 dentry = dp; 174 175 exp2 = rqst_exp_parent(rqstp, mnt, dentry); 176 if (PTR_ERR(exp2) == -ENOENT) { 177 dput(dentry); 178 dentry = dget(dparent); 179 } else if (IS_ERR(exp2)) { 180 host_err = PTR_ERR(exp2); 181 dput(dentry); 182 mntput(mnt); 183 goto out_nfserr; 184 } else { 185 exp_put(exp); 186 exp = exp2; 187 } 188 mntput(mnt); 189 } 190 } else { 191 fh_lock(fhp); 192 dentry = lookup_one_len(name, dparent, len); 193 host_err = PTR_ERR(dentry); 194 if (IS_ERR(dentry)) 195 goto out_nfserr; 196 /* 197 * check if we have crossed a mount point ... 198 */ 199 if (d_mountpoint(dentry)) { 200 if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) { 201 dput(dentry); 202 goto out_nfserr; 203 } 204 } 205 } 206 *dentry_ret = dentry; 207 *exp_ret = exp; 208 return 0; 209 210 out_nfserr: 211 exp_put(exp); 212 return nfserrno(host_err); 213 } 214 215 /* 216 * Look up one component of a pathname. 217 * N.B. After this call _both_ fhp and resfh need an fh_put 218 * 219 * If the lookup would cross a mountpoint, and the mounted filesystem 220 * is exported to the client with NFSEXP_NOHIDE, then the lookup is 221 * accepted as it stands and the mounted directory is 222 * returned. Otherwise the covered directory is returned. 223 * NOTE: this mountpoint crossing is not supported properly by all 224 * clients and is explicitly disallowed for NFSv3 225 * NeilBrown <neilb@cse.unsw.edu.au> 226 */ 227 __be32 228 nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name, 229 unsigned int len, struct svc_fh *resfh) 230 { 231 struct svc_export *exp; 232 struct dentry *dentry; 233 __be32 err; 234 235 err = nfsd_lookup_dentry(rqstp, fhp, name, len, &exp, &dentry); 236 if (err) 237 return err; 238 err = check_nfsd_access(exp, rqstp); 239 if (err) 240 goto out; 241 /* 242 * Note: we compose the file handle now, but as the 243 * dentry may be negative, it may need to be updated. 244 */ 245 err = fh_compose(resfh, exp, dentry, fhp); 246 if (!err && !dentry->d_inode) 247 err = nfserr_noent; 248 out: 249 dput(dentry); 250 exp_put(exp); 251 return err; 252 } 253 254 255 /* 256 * Set various file attributes. 257 * N.B. After this call fhp needs an fh_put 258 */ 259 __be32 260 nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap, 261 int check_guard, time_t guardtime) 262 { 263 struct dentry *dentry; 264 struct inode *inode; 265 int accmode = NFSD_MAY_SATTR; 266 int ftype = 0; 267 __be32 err; 268 int host_err; 269 int size_change = 0; 270 271 if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE)) 272 accmode |= NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE; 273 if (iap->ia_valid & ATTR_SIZE) 274 ftype = S_IFREG; 275 276 /* Get inode */ 277 err = fh_verify(rqstp, fhp, ftype, accmode); 278 if (err) 279 goto out; 280 281 dentry = fhp->fh_dentry; 282 inode = dentry->d_inode; 283 284 /* Ignore any mode updates on symlinks */ 285 if (S_ISLNK(inode->i_mode)) 286 iap->ia_valid &= ~ATTR_MODE; 287 288 if (!iap->ia_valid) 289 goto out; 290 291 /* 292 * NFSv2 does not differentiate between "set-[ac]time-to-now" 293 * which only requires access, and "set-[ac]time-to-X" which 294 * requires ownership. 295 * So if it looks like it might be "set both to the same time which 296 * is close to now", and if inode_change_ok fails, then we 297 * convert to "set to now" instead of "set to explicit time" 298 * 299 * We only call inode_change_ok as the last test as technically 300 * it is not an interface that we should be using. It is only 301 * valid if the filesystem does not define it's own i_op->setattr. 302 */ 303 #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET) 304 #define MAX_TOUCH_TIME_ERROR (30*60) 305 if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET && 306 iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) { 307 /* 308 * Looks probable. 309 * 310 * Now just make sure time is in the right ballpark. 311 * Solaris, at least, doesn't seem to care what the time 312 * request is. We require it be within 30 minutes of now. 313 */ 314 time_t delta = iap->ia_atime.tv_sec - get_seconds(); 315 if (delta < 0) 316 delta = -delta; 317 if (delta < MAX_TOUCH_TIME_ERROR && 318 inode_change_ok(inode, iap) != 0) { 319 /* 320 * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME. 321 * This will cause notify_change to set these times 322 * to "now" 323 */ 324 iap->ia_valid &= ~BOTH_TIME_SET; 325 } 326 } 327 328 /* 329 * The size case is special. 330 * It changes the file as well as the attributes. 331 */ 332 if (iap->ia_valid & ATTR_SIZE) { 333 if (iap->ia_size < inode->i_size) { 334 err = nfsd_permission(rqstp, fhp->fh_export, dentry, 335 NFSD_MAY_TRUNC|NFSD_MAY_OWNER_OVERRIDE); 336 if (err) 337 goto out; 338 } 339 340 /* 341 * If we are changing the size of the file, then 342 * we need to break all leases. 343 */ 344 host_err = break_lease(inode, FMODE_WRITE | O_NONBLOCK); 345 if (host_err == -EWOULDBLOCK) 346 host_err = -ETIMEDOUT; 347 if (host_err) /* ENOMEM or EWOULDBLOCK */ 348 goto out_nfserr; 349 350 host_err = get_write_access(inode); 351 if (host_err) 352 goto out_nfserr; 353 354 size_change = 1; 355 host_err = locks_verify_truncate(inode, NULL, iap->ia_size); 356 if (host_err) { 357 put_write_access(inode); 358 goto out_nfserr; 359 } 360 DQUOT_INIT(inode); 361 } 362 363 /* sanitize the mode change */ 364 if (iap->ia_valid & ATTR_MODE) { 365 iap->ia_mode &= S_IALLUGO; 366 iap->ia_mode |= (inode->i_mode & ~S_IALLUGO); 367 } 368 369 /* Revoke setuid/setgid on chown */ 370 if (((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) || 371 ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid)) { 372 iap->ia_valid |= ATTR_KILL_PRIV; 373 if (iap->ia_valid & ATTR_MODE) { 374 /* we're setting mode too, just clear the s*id bits */ 375 iap->ia_mode &= ~S_ISUID; 376 if (iap->ia_mode & S_IXGRP) 377 iap->ia_mode &= ~S_ISGID; 378 } else { 379 /* set ATTR_KILL_* bits and let VFS handle it */ 380 iap->ia_valid |= (ATTR_KILL_SUID | ATTR_KILL_SGID); 381 } 382 } 383 384 /* Change the attributes. */ 385 386 iap->ia_valid |= ATTR_CTIME; 387 388 err = nfserr_notsync; 389 if (!check_guard || guardtime == inode->i_ctime.tv_sec) { 390 fh_lock(fhp); 391 host_err = notify_change(dentry, iap); 392 err = nfserrno(host_err); 393 fh_unlock(fhp); 394 } 395 if (size_change) 396 put_write_access(inode); 397 if (!err) 398 if (EX_ISSYNC(fhp->fh_export)) 399 write_inode_now(inode, 1); 400 out: 401 return err; 402 403 out_nfserr: 404 err = nfserrno(host_err); 405 goto out; 406 } 407 408 #if defined(CONFIG_NFSD_V2_ACL) || \ 409 defined(CONFIG_NFSD_V3_ACL) || \ 410 defined(CONFIG_NFSD_V4) 411 static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf) 412 { 413 ssize_t buflen; 414 415 buflen = vfs_getxattr(dentry, key, NULL, 0); 416 if (buflen <= 0) 417 return buflen; 418 419 *buf = kmalloc(buflen, GFP_KERNEL); 420 if (!*buf) 421 return -ENOMEM; 422 423 return vfs_getxattr(dentry, key, *buf, buflen); 424 } 425 #endif 426 427 #if defined(CONFIG_NFSD_V4) 428 static int 429 set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key) 430 { 431 int len; 432 size_t buflen; 433 char *buf = NULL; 434 int error = 0; 435 436 buflen = posix_acl_xattr_size(pacl->a_count); 437 buf = kmalloc(buflen, GFP_KERNEL); 438 error = -ENOMEM; 439 if (buf == NULL) 440 goto out; 441 442 len = posix_acl_to_xattr(pacl, buf, buflen); 443 if (len < 0) { 444 error = len; 445 goto out; 446 } 447 448 error = vfs_setxattr(dentry, key, buf, len, 0); 449 out: 450 kfree(buf); 451 return error; 452 } 453 454 __be32 455 nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp, 456 struct nfs4_acl *acl) 457 { 458 __be32 error; 459 int host_error; 460 struct dentry *dentry; 461 struct inode *inode; 462 struct posix_acl *pacl = NULL, *dpacl = NULL; 463 unsigned int flags = 0; 464 465 /* Get inode */ 466 error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, NFSD_MAY_SATTR); 467 if (error) 468 return error; 469 470 dentry = fhp->fh_dentry; 471 inode = dentry->d_inode; 472 if (S_ISDIR(inode->i_mode)) 473 flags = NFS4_ACL_DIR; 474 475 host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags); 476 if (host_error == -EINVAL) { 477 return nfserr_attrnotsupp; 478 } else if (host_error < 0) 479 goto out_nfserr; 480 481 host_error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS); 482 if (host_error < 0) 483 goto out_release; 484 485 if (S_ISDIR(inode->i_mode)) 486 host_error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT); 487 488 out_release: 489 posix_acl_release(pacl); 490 posix_acl_release(dpacl); 491 out_nfserr: 492 if (host_error == -EOPNOTSUPP) 493 return nfserr_attrnotsupp; 494 else 495 return nfserrno(host_error); 496 } 497 498 static struct posix_acl * 499 _get_posix_acl(struct dentry *dentry, char *key) 500 { 501 void *buf = NULL; 502 struct posix_acl *pacl = NULL; 503 int buflen; 504 505 buflen = nfsd_getxattr(dentry, key, &buf); 506 if (!buflen) 507 buflen = -ENODATA; 508 if (buflen <= 0) 509 return ERR_PTR(buflen); 510 511 pacl = posix_acl_from_xattr(buf, buflen); 512 kfree(buf); 513 return pacl; 514 } 515 516 int 517 nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl) 518 { 519 struct inode *inode = dentry->d_inode; 520 int error = 0; 521 struct posix_acl *pacl = NULL, *dpacl = NULL; 522 unsigned int flags = 0; 523 524 pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS); 525 if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA) 526 pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); 527 if (IS_ERR(pacl)) { 528 error = PTR_ERR(pacl); 529 pacl = NULL; 530 goto out; 531 } 532 533 if (S_ISDIR(inode->i_mode)) { 534 dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT); 535 if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA) 536 dpacl = NULL; 537 else if (IS_ERR(dpacl)) { 538 error = PTR_ERR(dpacl); 539 dpacl = NULL; 540 goto out; 541 } 542 flags = NFS4_ACL_DIR; 543 } 544 545 *acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags); 546 if (IS_ERR(*acl)) { 547 error = PTR_ERR(*acl); 548 *acl = NULL; 549 } 550 out: 551 posix_acl_release(pacl); 552 posix_acl_release(dpacl); 553 return error; 554 } 555 556 #endif /* defined(CONFIG_NFS_V4) */ 557 558 #ifdef CONFIG_NFSD_V3 559 /* 560 * Check server access rights to a file system object 561 */ 562 struct accessmap { 563 u32 access; 564 int how; 565 }; 566 static struct accessmap nfs3_regaccess[] = { 567 { NFS3_ACCESS_READ, NFSD_MAY_READ }, 568 { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, 569 { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_TRUNC }, 570 { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE }, 571 572 { 0, 0 } 573 }; 574 575 static struct accessmap nfs3_diraccess[] = { 576 { NFS3_ACCESS_READ, NFSD_MAY_READ }, 577 { NFS3_ACCESS_LOOKUP, NFSD_MAY_EXEC }, 578 { NFS3_ACCESS_MODIFY, NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC}, 579 { NFS3_ACCESS_EXTEND, NFSD_MAY_EXEC|NFSD_MAY_WRITE }, 580 { NFS3_ACCESS_DELETE, NFSD_MAY_REMOVE }, 581 582 { 0, 0 } 583 }; 584 585 static struct accessmap nfs3_anyaccess[] = { 586 /* Some clients - Solaris 2.6 at least, make an access call 587 * to the server to check for access for things like /dev/null 588 * (which really, the server doesn't care about). So 589 * We provide simple access checking for them, looking 590 * mainly at mode bits, and we make sure to ignore read-only 591 * filesystem checks 592 */ 593 { NFS3_ACCESS_READ, NFSD_MAY_READ }, 594 { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, 595 { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, 596 { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, 597 598 { 0, 0 } 599 }; 600 601 __be32 602 nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported) 603 { 604 struct accessmap *map; 605 struct svc_export *export; 606 struct dentry *dentry; 607 u32 query, result = 0, sresult = 0; 608 __be32 error; 609 610 error = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP); 611 if (error) 612 goto out; 613 614 export = fhp->fh_export; 615 dentry = fhp->fh_dentry; 616 617 if (S_ISREG(dentry->d_inode->i_mode)) 618 map = nfs3_regaccess; 619 else if (S_ISDIR(dentry->d_inode->i_mode)) 620 map = nfs3_diraccess; 621 else 622 map = nfs3_anyaccess; 623 624 625 query = *access; 626 for (; map->access; map++) { 627 if (map->access & query) { 628 __be32 err2; 629 630 sresult |= map->access; 631 632 err2 = nfsd_permission(rqstp, export, dentry, map->how); 633 switch (err2) { 634 case nfs_ok: 635 result |= map->access; 636 break; 637 638 /* the following error codes just mean the access was not allowed, 639 * rather than an error occurred */ 640 case nfserr_rofs: 641 case nfserr_acces: 642 case nfserr_perm: 643 /* simply don't "or" in the access bit. */ 644 break; 645 default: 646 error = err2; 647 goto out; 648 } 649 } 650 } 651 *access = result; 652 if (supported) 653 *supported = sresult; 654 655 out: 656 return error; 657 } 658 #endif /* CONFIG_NFSD_V3 */ 659 660 661 662 /* 663 * Open an existing file or directory. 664 * The access argument indicates the type of open (read/write/lock) 665 * N.B. After this call fhp needs an fh_put 666 */ 667 __be32 668 nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, 669 int access, struct file **filp) 670 { 671 struct dentry *dentry; 672 struct inode *inode; 673 int flags = O_RDONLY|O_LARGEFILE; 674 __be32 err; 675 int host_err; 676 677 /* 678 * If we get here, then the client has already done an "open", 679 * and (hopefully) checked permission - so allow OWNER_OVERRIDE 680 * in case a chmod has now revoked permission. 681 */ 682 err = fh_verify(rqstp, fhp, type, access | NFSD_MAY_OWNER_OVERRIDE); 683 if (err) 684 goto out; 685 686 dentry = fhp->fh_dentry; 687 inode = dentry->d_inode; 688 689 /* Disallow write access to files with the append-only bit set 690 * or any access when mandatory locking enabled 691 */ 692 err = nfserr_perm; 693 if (IS_APPEND(inode) && (access & NFSD_MAY_WRITE)) 694 goto out; 695 /* 696 * We must ignore files (but only files) which might have mandatory 697 * locks on them because there is no way to know if the accesser has 698 * the lock. 699 */ 700 if (S_ISREG((inode)->i_mode) && mandatory_lock(inode)) 701 goto out; 702 703 if (!inode->i_fop) 704 goto out; 705 706 /* 707 * Check to see if there are any leases on this file. 708 * This may block while leases are broken. 709 */ 710 host_err = break_lease(inode, O_NONBLOCK | ((access & NFSD_MAY_WRITE) ? FMODE_WRITE : 0)); 711 if (host_err == -EWOULDBLOCK) 712 host_err = -ETIMEDOUT; 713 if (host_err) /* NOMEM or WOULDBLOCK */ 714 goto out_nfserr; 715 716 if (access & NFSD_MAY_WRITE) { 717 if (access & NFSD_MAY_READ) 718 flags = O_RDWR|O_LARGEFILE; 719 else 720 flags = O_WRONLY|O_LARGEFILE; 721 722 DQUOT_INIT(inode); 723 } 724 *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_path.mnt), 725 flags); 726 if (IS_ERR(*filp)) 727 host_err = PTR_ERR(*filp); 728 out_nfserr: 729 err = nfserrno(host_err); 730 out: 731 return err; 732 } 733 734 /* 735 * Close a file. 736 */ 737 void 738 nfsd_close(struct file *filp) 739 { 740 fput(filp); 741 } 742 743 /* 744 * Sync a file 745 * As this calls fsync (not fdatasync) there is no need for a write_inode 746 * after it. 747 */ 748 static inline int nfsd_dosync(struct file *filp, struct dentry *dp, 749 const struct file_operations *fop) 750 { 751 struct inode *inode = dp->d_inode; 752 int (*fsync) (struct file *, struct dentry *, int); 753 int err; 754 755 err = filemap_fdatawrite(inode->i_mapping); 756 if (err == 0 && fop && (fsync = fop->fsync)) 757 err = fsync(filp, dp, 0); 758 if (err == 0) 759 err = filemap_fdatawait(inode->i_mapping); 760 761 return err; 762 } 763 764 765 static int 766 nfsd_sync(struct file *filp) 767 { 768 int err; 769 struct inode *inode = filp->f_path.dentry->d_inode; 770 dprintk("nfsd: sync file %s\n", filp->f_path.dentry->d_name.name); 771 mutex_lock(&inode->i_mutex); 772 err=nfsd_dosync(filp, filp->f_path.dentry, filp->f_op); 773 mutex_unlock(&inode->i_mutex); 774 775 return err; 776 } 777 778 int 779 nfsd_sync_dir(struct dentry *dp) 780 { 781 return nfsd_dosync(NULL, dp, dp->d_inode->i_fop); 782 } 783 784 /* 785 * Obtain the readahead parameters for the file 786 * specified by (dev, ino). 787 */ 788 789 static inline struct raparms * 790 nfsd_get_raparms(dev_t dev, ino_t ino) 791 { 792 struct raparms *ra, **rap, **frap = NULL; 793 int depth = 0; 794 unsigned int hash; 795 struct raparm_hbucket *rab; 796 797 hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK; 798 rab = &raparm_hash[hash]; 799 800 spin_lock(&rab->pb_lock); 801 for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) { 802 if (ra->p_ino == ino && ra->p_dev == dev) 803 goto found; 804 depth++; 805 if (ra->p_count == 0) 806 frap = rap; 807 } 808 depth = nfsdstats.ra_size*11/10; 809 if (!frap) { 810 spin_unlock(&rab->pb_lock); 811 return NULL; 812 } 813 rap = frap; 814 ra = *frap; 815 ra->p_dev = dev; 816 ra->p_ino = ino; 817 ra->p_set = 0; 818 ra->p_hindex = hash; 819 found: 820 if (rap != &rab->pb_head) { 821 *rap = ra->p_next; 822 ra->p_next = rab->pb_head; 823 rab->pb_head = ra; 824 } 825 ra->p_count++; 826 nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++; 827 spin_unlock(&rab->pb_lock); 828 return ra; 829 } 830 831 /* 832 * Grab and keep cached pages associated with a file in the svc_rqst 833 * so that they can be passed to the network sendmsg/sendpage routines 834 * directly. They will be released after the sending has completed. 835 */ 836 static int 837 nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf, 838 struct splice_desc *sd) 839 { 840 struct svc_rqst *rqstp = sd->u.data; 841 struct page **pp = rqstp->rq_respages + rqstp->rq_resused; 842 struct page *page = buf->page; 843 size_t size; 844 int ret; 845 846 ret = buf->ops->confirm(pipe, buf); 847 if (unlikely(ret)) 848 return ret; 849 850 size = sd->len; 851 852 if (rqstp->rq_res.page_len == 0) { 853 get_page(page); 854 put_page(*pp); 855 *pp = page; 856 rqstp->rq_resused++; 857 rqstp->rq_res.page_base = buf->offset; 858 rqstp->rq_res.page_len = size; 859 } else if (page != pp[-1]) { 860 get_page(page); 861 if (*pp) 862 put_page(*pp); 863 *pp = page; 864 rqstp->rq_resused++; 865 rqstp->rq_res.page_len += size; 866 } else 867 rqstp->rq_res.page_len += size; 868 869 return size; 870 } 871 872 static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe, 873 struct splice_desc *sd) 874 { 875 return __splice_from_pipe(pipe, sd, nfsd_splice_actor); 876 } 877 878 static inline int svc_msnfs(struct svc_fh *ffhp) 879 { 880 #ifdef MSNFS 881 return (ffhp->fh_export->ex_flags & NFSEXP_MSNFS); 882 #else 883 return 0; 884 #endif 885 } 886 887 static __be32 888 nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 889 loff_t offset, struct kvec *vec, int vlen, unsigned long *count) 890 { 891 struct inode *inode; 892 struct raparms *ra; 893 mm_segment_t oldfs; 894 __be32 err; 895 int host_err; 896 897 err = nfserr_perm; 898 inode = file->f_path.dentry->d_inode; 899 900 if (svc_msnfs(fhp) && !lock_may_read(inode, offset, *count)) 901 goto out; 902 903 /* Get readahead parameters */ 904 ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino); 905 906 if (ra && ra->p_set) 907 file->f_ra = ra->p_ra; 908 909 if (file->f_op->splice_read && rqstp->rq_splice_ok) { 910 struct splice_desc sd = { 911 .len = 0, 912 .total_len = *count, 913 .pos = offset, 914 .u.data = rqstp, 915 }; 916 917 rqstp->rq_resused = 1; 918 host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor); 919 } else { 920 oldfs = get_fs(); 921 set_fs(KERNEL_DS); 922 host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset); 923 set_fs(oldfs); 924 } 925 926 /* Write back readahead params */ 927 if (ra) { 928 struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex]; 929 spin_lock(&rab->pb_lock); 930 ra->p_ra = file->f_ra; 931 ra->p_set = 1; 932 ra->p_count--; 933 spin_unlock(&rab->pb_lock); 934 } 935 936 if (host_err >= 0) { 937 nfsdstats.io_read += host_err; 938 *count = host_err; 939 err = 0; 940 fsnotify_access(file->f_path.dentry); 941 } else 942 err = nfserrno(host_err); 943 out: 944 return err; 945 } 946 947 static void kill_suid(struct dentry *dentry) 948 { 949 struct iattr ia; 950 ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV; 951 952 mutex_lock(&dentry->d_inode->i_mutex); 953 notify_change(dentry, &ia); 954 mutex_unlock(&dentry->d_inode->i_mutex); 955 } 956 957 static __be32 958 nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 959 loff_t offset, struct kvec *vec, int vlen, 960 unsigned long cnt, int *stablep) 961 { 962 struct svc_export *exp; 963 struct dentry *dentry; 964 struct inode *inode; 965 mm_segment_t oldfs; 966 __be32 err = 0; 967 int host_err; 968 int stable = *stablep; 969 970 #ifdef MSNFS 971 err = nfserr_perm; 972 973 if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && 974 (!lock_may_write(file->f_path.dentry->d_inode, offset, cnt))) 975 goto out; 976 #endif 977 978 dentry = file->f_path.dentry; 979 inode = dentry->d_inode; 980 exp = fhp->fh_export; 981 982 /* 983 * Request sync writes if 984 * - the sync export option has been set, or 985 * - the client requested O_SYNC behavior (NFSv3 feature). 986 * - The file system doesn't support fsync(). 987 * When gathered writes have been configured for this volume, 988 * flushing the data to disk is handled separately below. 989 */ 990 991 if (!file->f_op->fsync) {/* COMMIT3 cannot work */ 992 stable = 2; 993 *stablep = 2; /* FILE_SYNC */ 994 } 995 996 if (!EX_ISSYNC(exp)) 997 stable = 0; 998 if (stable && !EX_WGATHER(exp)) 999 file->f_flags |= O_SYNC; 1000 1001 /* Write the data. */ 1002 oldfs = get_fs(); set_fs(KERNEL_DS); 1003 host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset); 1004 set_fs(oldfs); 1005 if (host_err >= 0) { 1006 nfsdstats.io_write += cnt; 1007 fsnotify_modify(file->f_path.dentry); 1008 } 1009 1010 /* clear setuid/setgid flag after write */ 1011 if (host_err >= 0 && (inode->i_mode & (S_ISUID | S_ISGID))) 1012 kill_suid(dentry); 1013 1014 if (host_err >= 0 && stable) { 1015 static ino_t last_ino; 1016 static dev_t last_dev; 1017 1018 /* 1019 * Gathered writes: If another process is currently 1020 * writing to the file, there's a high chance 1021 * this is another nfsd (triggered by a bulk write 1022 * from a client's biod). Rather than syncing the 1023 * file with each write request, we sleep for 10 msec. 1024 * 1025 * I don't know if this roughly approximates 1026 * C. Juszak's idea of gathered writes, but it's a 1027 * nice and simple solution (IMHO), and it seems to 1028 * work:-) 1029 */ 1030 if (EX_WGATHER(exp)) { 1031 if (atomic_read(&inode->i_writecount) > 1 1032 || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) { 1033 dprintk("nfsd: write defer %d\n", task_pid_nr(current)); 1034 msleep(10); 1035 dprintk("nfsd: write resume %d\n", task_pid_nr(current)); 1036 } 1037 1038 if (inode->i_state & I_DIRTY) { 1039 dprintk("nfsd: write sync %d\n", task_pid_nr(current)); 1040 host_err=nfsd_sync(file); 1041 } 1042 #if 0 1043 wake_up(&inode->i_wait); 1044 #endif 1045 } 1046 last_ino = inode->i_ino; 1047 last_dev = inode->i_sb->s_dev; 1048 } 1049 1050 dprintk("nfsd: write complete host_err=%d\n", host_err); 1051 if (host_err >= 0) 1052 err = 0; 1053 else 1054 err = nfserrno(host_err); 1055 out: 1056 return err; 1057 } 1058 1059 /* 1060 * Read data from a file. count must contain the requested read count 1061 * on entry. On return, *count contains the number of bytes actually read. 1062 * N.B. After this call fhp needs an fh_put 1063 */ 1064 __be32 1065 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 1066 loff_t offset, struct kvec *vec, int vlen, 1067 unsigned long *count) 1068 { 1069 __be32 err; 1070 1071 if (file) { 1072 err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, 1073 NFSD_MAY_READ|NFSD_MAY_OWNER_OVERRIDE); 1074 if (err) 1075 goto out; 1076 err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); 1077 } else { 1078 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file); 1079 if (err) 1080 goto out; 1081 err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); 1082 nfsd_close(file); 1083 } 1084 out: 1085 return err; 1086 } 1087 1088 /* 1089 * Write data to a file. 1090 * The stable flag requests synchronous writes. 1091 * N.B. After this call fhp needs an fh_put 1092 */ 1093 __be32 1094 nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 1095 loff_t offset, struct kvec *vec, int vlen, unsigned long cnt, 1096 int *stablep) 1097 { 1098 __be32 err = 0; 1099 1100 if (file) { 1101 err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, 1102 NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE); 1103 if (err) 1104 goto out; 1105 err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt, 1106 stablep); 1107 } else { 1108 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file); 1109 if (err) 1110 goto out; 1111 1112 if (cnt) 1113 err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, 1114 cnt, stablep); 1115 nfsd_close(file); 1116 } 1117 out: 1118 return err; 1119 } 1120 1121 #ifdef CONFIG_NFSD_V3 1122 /* 1123 * Commit all pending writes to stable storage. 1124 * Strictly speaking, we could sync just the indicated file region here, 1125 * but there's currently no way we can ask the VFS to do so. 1126 * 1127 * Unfortunately we cannot lock the file to make sure we return full WCC 1128 * data to the client, as locking happens lower down in the filesystem. 1129 */ 1130 __be32 1131 nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp, 1132 loff_t offset, unsigned long count) 1133 { 1134 struct file *file; 1135 __be32 err; 1136 1137 if ((u64)count > ~(u64)offset) 1138 return nfserr_inval; 1139 1140 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file); 1141 if (err) 1142 return err; 1143 if (EX_ISSYNC(fhp->fh_export)) { 1144 if (file->f_op && file->f_op->fsync) { 1145 err = nfserrno(nfsd_sync(file)); 1146 } else { 1147 err = nfserr_notsupp; 1148 } 1149 } 1150 1151 nfsd_close(file); 1152 return err; 1153 } 1154 #endif /* CONFIG_NFSD_V3 */ 1155 1156 static __be32 1157 nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *resfhp, 1158 struct iattr *iap) 1159 { 1160 /* 1161 * Mode has already been set earlier in create: 1162 */ 1163 iap->ia_valid &= ~ATTR_MODE; 1164 /* 1165 * Setting uid/gid works only for root. Irix appears to 1166 * send along the gid on create when it tries to implement 1167 * setgid directories via NFS: 1168 */ 1169 if (current->fsuid != 0) 1170 iap->ia_valid &= ~(ATTR_UID|ATTR_GID); 1171 if (iap->ia_valid) 1172 return nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); 1173 return 0; 1174 } 1175 1176 /* 1177 * Create a file (regular, directory, device, fifo); UNIX sockets 1178 * not yet implemented. 1179 * If the response fh has been verified, the parent directory should 1180 * already be locked. Note that the parent directory is left locked. 1181 * 1182 * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp 1183 */ 1184 __be32 1185 nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, 1186 char *fname, int flen, struct iattr *iap, 1187 int type, dev_t rdev, struct svc_fh *resfhp) 1188 { 1189 struct dentry *dentry, *dchild = NULL; 1190 struct inode *dirp; 1191 __be32 err; 1192 __be32 err2; 1193 int host_err; 1194 1195 err = nfserr_perm; 1196 if (!flen) 1197 goto out; 1198 err = nfserr_exist; 1199 if (isdotent(fname, flen)) 1200 goto out; 1201 1202 err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 1203 if (err) 1204 goto out; 1205 1206 dentry = fhp->fh_dentry; 1207 dirp = dentry->d_inode; 1208 1209 err = nfserr_notdir; 1210 if(!dirp->i_op || !dirp->i_op->lookup) 1211 goto out; 1212 /* 1213 * Check whether the response file handle has been verified yet. 1214 * If it has, the parent directory should already be locked. 1215 */ 1216 if (!resfhp->fh_dentry) { 1217 /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */ 1218 fh_lock_nested(fhp, I_MUTEX_PARENT); 1219 dchild = lookup_one_len(fname, dentry, flen); 1220 host_err = PTR_ERR(dchild); 1221 if (IS_ERR(dchild)) 1222 goto out_nfserr; 1223 err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); 1224 if (err) 1225 goto out; 1226 } else { 1227 /* called from nfsd_proc_create */ 1228 dchild = dget(resfhp->fh_dentry); 1229 if (!fhp->fh_locked) { 1230 /* not actually possible */ 1231 printk(KERN_ERR 1232 "nfsd_create: parent %s/%s not locked!\n", 1233 dentry->d_parent->d_name.name, 1234 dentry->d_name.name); 1235 err = nfserr_io; 1236 goto out; 1237 } 1238 } 1239 /* 1240 * Make sure the child dentry is still negative ... 1241 */ 1242 err = nfserr_exist; 1243 if (dchild->d_inode) { 1244 dprintk("nfsd_create: dentry %s/%s not negative!\n", 1245 dentry->d_name.name, dchild->d_name.name); 1246 goto out; 1247 } 1248 1249 if (!(iap->ia_valid & ATTR_MODE)) 1250 iap->ia_mode = 0; 1251 iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type; 1252 1253 err = nfserr_inval; 1254 if (!S_ISREG(type) && !S_ISDIR(type) && !special_file(type)) { 1255 printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n", 1256 type); 1257 goto out; 1258 } 1259 1260 host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 1261 if (host_err) 1262 goto out_nfserr; 1263 1264 /* 1265 * Get the dir op function pointer. 1266 */ 1267 err = 0; 1268 switch (type) { 1269 case S_IFREG: 1270 host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); 1271 break; 1272 case S_IFDIR: 1273 host_err = vfs_mkdir(dirp, dchild, iap->ia_mode); 1274 break; 1275 case S_IFCHR: 1276 case S_IFBLK: 1277 case S_IFIFO: 1278 case S_IFSOCK: 1279 host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev); 1280 break; 1281 } 1282 if (host_err < 0) { 1283 mnt_drop_write(fhp->fh_export->ex_path.mnt); 1284 goto out_nfserr; 1285 } 1286 1287 if (EX_ISSYNC(fhp->fh_export)) { 1288 err = nfserrno(nfsd_sync_dir(dentry)); 1289 write_inode_now(dchild->d_inode, 1); 1290 } 1291 1292 err2 = nfsd_create_setattr(rqstp, resfhp, iap); 1293 if (err2) 1294 err = err2; 1295 mnt_drop_write(fhp->fh_export->ex_path.mnt); 1296 /* 1297 * Update the file handle to get the new inode info. 1298 */ 1299 if (!err) 1300 err = fh_update(resfhp); 1301 out: 1302 if (dchild && !IS_ERR(dchild)) 1303 dput(dchild); 1304 return err; 1305 1306 out_nfserr: 1307 err = nfserrno(host_err); 1308 goto out; 1309 } 1310 1311 #ifdef CONFIG_NFSD_V3 1312 /* 1313 * NFSv3 version of nfsd_create 1314 */ 1315 __be32 1316 nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp, 1317 char *fname, int flen, struct iattr *iap, 1318 struct svc_fh *resfhp, int createmode, u32 *verifier, 1319 int *truncp, int *created) 1320 { 1321 struct dentry *dentry, *dchild = NULL; 1322 struct inode *dirp; 1323 __be32 err; 1324 __be32 err2; 1325 int host_err; 1326 __u32 v_mtime=0, v_atime=0; 1327 1328 err = nfserr_perm; 1329 if (!flen) 1330 goto out; 1331 err = nfserr_exist; 1332 if (isdotent(fname, flen)) 1333 goto out; 1334 if (!(iap->ia_valid & ATTR_MODE)) 1335 iap->ia_mode = 0; 1336 err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 1337 if (err) 1338 goto out; 1339 1340 dentry = fhp->fh_dentry; 1341 dirp = dentry->d_inode; 1342 1343 /* Get all the sanity checks out of the way before 1344 * we lock the parent. */ 1345 err = nfserr_notdir; 1346 if(!dirp->i_op || !dirp->i_op->lookup) 1347 goto out; 1348 fh_lock_nested(fhp, I_MUTEX_PARENT); 1349 1350 /* 1351 * Compose the response file handle. 1352 */ 1353 dchild = lookup_one_len(fname, dentry, flen); 1354 host_err = PTR_ERR(dchild); 1355 if (IS_ERR(dchild)) 1356 goto out_nfserr; 1357 1358 err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); 1359 if (err) 1360 goto out; 1361 1362 if (createmode == NFS3_CREATE_EXCLUSIVE) { 1363 /* solaris7 gets confused (bugid 4218508) if these have 1364 * the high bit set, so just clear the high bits. If this is 1365 * ever changed to use different attrs for storing the 1366 * verifier, then do_open_lookup() will also need to be fixed 1367 * accordingly. 1368 */ 1369 v_mtime = verifier[0]&0x7fffffff; 1370 v_atime = verifier[1]&0x7fffffff; 1371 } 1372 1373 host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 1374 if (host_err) 1375 goto out_nfserr; 1376 if (dchild->d_inode) { 1377 err = 0; 1378 1379 switch (createmode) { 1380 case NFS3_CREATE_UNCHECKED: 1381 if (! S_ISREG(dchild->d_inode->i_mode)) 1382 err = nfserr_exist; 1383 else if (truncp) { 1384 /* in nfsv4, we need to treat this case a little 1385 * differently. we don't want to truncate the 1386 * file now; this would be wrong if the OPEN 1387 * fails for some other reason. furthermore, 1388 * if the size is nonzero, we should ignore it 1389 * according to spec! 1390 */ 1391 *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size; 1392 } 1393 else { 1394 iap->ia_valid &= ATTR_SIZE; 1395 goto set_attr; 1396 } 1397 break; 1398 case NFS3_CREATE_EXCLUSIVE: 1399 if ( dchild->d_inode->i_mtime.tv_sec == v_mtime 1400 && dchild->d_inode->i_atime.tv_sec == v_atime 1401 && dchild->d_inode->i_size == 0 ) 1402 break; 1403 /* fallthru */ 1404 case NFS3_CREATE_GUARDED: 1405 err = nfserr_exist; 1406 } 1407 mnt_drop_write(fhp->fh_export->ex_path.mnt); 1408 goto out; 1409 } 1410 1411 host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); 1412 if (host_err < 0) { 1413 mnt_drop_write(fhp->fh_export->ex_path.mnt); 1414 goto out_nfserr; 1415 } 1416 if (created) 1417 *created = 1; 1418 1419 if (EX_ISSYNC(fhp->fh_export)) { 1420 err = nfserrno(nfsd_sync_dir(dentry)); 1421 /* setattr will sync the child (or not) */ 1422 } 1423 1424 if (createmode == NFS3_CREATE_EXCLUSIVE) { 1425 /* Cram the verifier into atime/mtime */ 1426 iap->ia_valid = ATTR_MTIME|ATTR_ATIME 1427 | ATTR_MTIME_SET|ATTR_ATIME_SET; 1428 /* XXX someone who knows this better please fix it for nsec */ 1429 iap->ia_mtime.tv_sec = v_mtime; 1430 iap->ia_atime.tv_sec = v_atime; 1431 iap->ia_mtime.tv_nsec = 0; 1432 iap->ia_atime.tv_nsec = 0; 1433 } 1434 1435 set_attr: 1436 err2 = nfsd_create_setattr(rqstp, resfhp, iap); 1437 if (err2) 1438 err = err2; 1439 1440 mnt_drop_write(fhp->fh_export->ex_path.mnt); 1441 /* 1442 * Update the filehandle to get the new inode info. 1443 */ 1444 if (!err) 1445 err = fh_update(resfhp); 1446 1447 out: 1448 fh_unlock(fhp); 1449 if (dchild && !IS_ERR(dchild)) 1450 dput(dchild); 1451 return err; 1452 1453 out_nfserr: 1454 err = nfserrno(host_err); 1455 goto out; 1456 } 1457 #endif /* CONFIG_NFSD_V3 */ 1458 1459 /* 1460 * Read a symlink. On entry, *lenp must contain the maximum path length that 1461 * fits into the buffer. On return, it contains the true length. 1462 * N.B. After this call fhp needs an fh_put 1463 */ 1464 __be32 1465 nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp) 1466 { 1467 struct dentry *dentry; 1468 struct inode *inode; 1469 mm_segment_t oldfs; 1470 __be32 err; 1471 int host_err; 1472 1473 err = fh_verify(rqstp, fhp, S_IFLNK, NFSD_MAY_NOP); 1474 if (err) 1475 goto out; 1476 1477 dentry = fhp->fh_dentry; 1478 inode = dentry->d_inode; 1479 1480 err = nfserr_inval; 1481 if (!inode->i_op || !inode->i_op->readlink) 1482 goto out; 1483 1484 touch_atime(fhp->fh_export->ex_path.mnt, dentry); 1485 /* N.B. Why does this call need a get_fs()?? 1486 * Remove the set_fs and watch the fireworks:-) --okir 1487 */ 1488 1489 oldfs = get_fs(); set_fs(KERNEL_DS); 1490 host_err = inode->i_op->readlink(dentry, buf, *lenp); 1491 set_fs(oldfs); 1492 1493 if (host_err < 0) 1494 goto out_nfserr; 1495 *lenp = host_err; 1496 err = 0; 1497 out: 1498 return err; 1499 1500 out_nfserr: 1501 err = nfserrno(host_err); 1502 goto out; 1503 } 1504 1505 /* 1506 * Create a symlink and look up its inode 1507 * N.B. After this call _both_ fhp and resfhp need an fh_put 1508 */ 1509 __be32 1510 nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp, 1511 char *fname, int flen, 1512 char *path, int plen, 1513 struct svc_fh *resfhp, 1514 struct iattr *iap) 1515 { 1516 struct dentry *dentry, *dnew; 1517 __be32 err, cerr; 1518 int host_err; 1519 umode_t mode; 1520 1521 err = nfserr_noent; 1522 if (!flen || !plen) 1523 goto out; 1524 err = nfserr_exist; 1525 if (isdotent(fname, flen)) 1526 goto out; 1527 1528 err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 1529 if (err) 1530 goto out; 1531 fh_lock(fhp); 1532 dentry = fhp->fh_dentry; 1533 dnew = lookup_one_len(fname, dentry, flen); 1534 host_err = PTR_ERR(dnew); 1535 if (IS_ERR(dnew)) 1536 goto out_nfserr; 1537 1538 mode = S_IALLUGO; 1539 /* Only the MODE ATTRibute is even vaguely meaningful */ 1540 if (iap && (iap->ia_valid & ATTR_MODE)) 1541 mode = iap->ia_mode & S_IALLUGO; 1542 1543 host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 1544 if (host_err) 1545 goto out_nfserr; 1546 1547 if (unlikely(path[plen] != 0)) { 1548 char *path_alloced = kmalloc(plen+1, GFP_KERNEL); 1549 if (path_alloced == NULL) 1550 host_err = -ENOMEM; 1551 else { 1552 strncpy(path_alloced, path, plen); 1553 path_alloced[plen] = 0; 1554 host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced, mode); 1555 kfree(path_alloced); 1556 } 1557 } else 1558 host_err = vfs_symlink(dentry->d_inode, dnew, path, mode); 1559 1560 if (!host_err) { 1561 if (EX_ISSYNC(fhp->fh_export)) 1562 host_err = nfsd_sync_dir(dentry); 1563 } 1564 err = nfserrno(host_err); 1565 fh_unlock(fhp); 1566 1567 mnt_drop_write(fhp->fh_export->ex_path.mnt); 1568 1569 cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp); 1570 dput(dnew); 1571 if (err==0) err = cerr; 1572 out: 1573 return err; 1574 1575 out_nfserr: 1576 err = nfserrno(host_err); 1577 goto out; 1578 } 1579 1580 /* 1581 * Create a hardlink 1582 * N.B. After this call _both_ ffhp and tfhp need an fh_put 1583 */ 1584 __be32 1585 nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp, 1586 char *name, int len, struct svc_fh *tfhp) 1587 { 1588 struct dentry *ddir, *dnew, *dold; 1589 struct inode *dirp, *dest; 1590 __be32 err; 1591 int host_err; 1592 1593 err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_CREATE); 1594 if (err) 1595 goto out; 1596 err = fh_verify(rqstp, tfhp, -S_IFDIR, NFSD_MAY_NOP); 1597 if (err) 1598 goto out; 1599 1600 err = nfserr_perm; 1601 if (!len) 1602 goto out; 1603 err = nfserr_exist; 1604 if (isdotent(name, len)) 1605 goto out; 1606 1607 fh_lock_nested(ffhp, I_MUTEX_PARENT); 1608 ddir = ffhp->fh_dentry; 1609 dirp = ddir->d_inode; 1610 1611 dnew = lookup_one_len(name, ddir, len); 1612 host_err = PTR_ERR(dnew); 1613 if (IS_ERR(dnew)) 1614 goto out_nfserr; 1615 1616 dold = tfhp->fh_dentry; 1617 dest = dold->d_inode; 1618 1619 host_err = mnt_want_write(tfhp->fh_export->ex_path.mnt); 1620 if (host_err) { 1621 err = nfserrno(host_err); 1622 goto out_dput; 1623 } 1624 host_err = vfs_link(dold, dirp, dnew); 1625 if (!host_err) { 1626 if (EX_ISSYNC(ffhp->fh_export)) { 1627 err = nfserrno(nfsd_sync_dir(ddir)); 1628 write_inode_now(dest, 1); 1629 } 1630 err = 0; 1631 } else { 1632 if (host_err == -EXDEV && rqstp->rq_vers == 2) 1633 err = nfserr_acces; 1634 else 1635 err = nfserrno(host_err); 1636 } 1637 mnt_drop_write(tfhp->fh_export->ex_path.mnt); 1638 out_dput: 1639 dput(dnew); 1640 out_unlock: 1641 fh_unlock(ffhp); 1642 out: 1643 return err; 1644 1645 out_nfserr: 1646 err = nfserrno(host_err); 1647 goto out_unlock; 1648 } 1649 1650 /* 1651 * Rename a file 1652 * N.B. After this call _both_ ffhp and tfhp need an fh_put 1653 */ 1654 __be32 1655 nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, 1656 struct svc_fh *tfhp, char *tname, int tlen) 1657 { 1658 struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; 1659 struct inode *fdir, *tdir; 1660 __be32 err; 1661 int host_err; 1662 1663 err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_REMOVE); 1664 if (err) 1665 goto out; 1666 err = fh_verify(rqstp, tfhp, S_IFDIR, NFSD_MAY_CREATE); 1667 if (err) 1668 goto out; 1669 1670 fdentry = ffhp->fh_dentry; 1671 fdir = fdentry->d_inode; 1672 1673 tdentry = tfhp->fh_dentry; 1674 tdir = tdentry->d_inode; 1675 1676 err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev; 1677 if (ffhp->fh_export != tfhp->fh_export) 1678 goto out; 1679 1680 err = nfserr_perm; 1681 if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) 1682 goto out; 1683 1684 /* cannot use fh_lock as we need deadlock protective ordering 1685 * so do it by hand */ 1686 trap = lock_rename(tdentry, fdentry); 1687 ffhp->fh_locked = tfhp->fh_locked = 1; 1688 fill_pre_wcc(ffhp); 1689 fill_pre_wcc(tfhp); 1690 1691 odentry = lookup_one_len(fname, fdentry, flen); 1692 host_err = PTR_ERR(odentry); 1693 if (IS_ERR(odentry)) 1694 goto out_nfserr; 1695 1696 host_err = -ENOENT; 1697 if (!odentry->d_inode) 1698 goto out_dput_old; 1699 host_err = -EINVAL; 1700 if (odentry == trap) 1701 goto out_dput_old; 1702 1703 ndentry = lookup_one_len(tname, tdentry, tlen); 1704 host_err = PTR_ERR(ndentry); 1705 if (IS_ERR(ndentry)) 1706 goto out_dput_old; 1707 host_err = -ENOTEMPTY; 1708 if (ndentry == trap) 1709 goto out_dput_new; 1710 1711 if (svc_msnfs(ffhp) && 1712 ((atomic_read(&odentry->d_count) > 1) 1713 || (atomic_read(&ndentry->d_count) > 1))) { 1714 host_err = -EPERM; 1715 goto out_dput_new; 1716 } 1717 1718 host_err = -EXDEV; 1719 if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt) 1720 goto out_dput_new; 1721 host_err = mnt_want_write(ffhp->fh_export->ex_path.mnt); 1722 if (host_err) 1723 goto out_dput_new; 1724 1725 host_err = vfs_rename(fdir, odentry, tdir, ndentry); 1726 if (!host_err && EX_ISSYNC(tfhp->fh_export)) { 1727 host_err = nfsd_sync_dir(tdentry); 1728 if (!host_err) 1729 host_err = nfsd_sync_dir(fdentry); 1730 } 1731 1732 mnt_drop_write(ffhp->fh_export->ex_path.mnt); 1733 1734 out_dput_new: 1735 dput(ndentry); 1736 out_dput_old: 1737 dput(odentry); 1738 out_nfserr: 1739 err = nfserrno(host_err); 1740 1741 /* we cannot reply on fh_unlock on the two filehandles, 1742 * as that would do the wrong thing if the two directories 1743 * were the same, so again we do it by hand 1744 */ 1745 fill_post_wcc(ffhp); 1746 fill_post_wcc(tfhp); 1747 unlock_rename(tdentry, fdentry); 1748 ffhp->fh_locked = tfhp->fh_locked = 0; 1749 1750 out: 1751 return err; 1752 } 1753 1754 /* 1755 * Unlink a file or directory 1756 * N.B. After this call fhp needs an fh_put 1757 */ 1758 __be32 1759 nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, 1760 char *fname, int flen) 1761 { 1762 struct dentry *dentry, *rdentry; 1763 struct inode *dirp; 1764 __be32 err; 1765 int host_err; 1766 1767 err = nfserr_acces; 1768 if (!flen || isdotent(fname, flen)) 1769 goto out; 1770 err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_REMOVE); 1771 if (err) 1772 goto out; 1773 1774 fh_lock_nested(fhp, I_MUTEX_PARENT); 1775 dentry = fhp->fh_dentry; 1776 dirp = dentry->d_inode; 1777 1778 rdentry = lookup_one_len(fname, dentry, flen); 1779 host_err = PTR_ERR(rdentry); 1780 if (IS_ERR(rdentry)) 1781 goto out_nfserr; 1782 1783 if (!rdentry->d_inode) { 1784 dput(rdentry); 1785 err = nfserr_noent; 1786 goto out; 1787 } 1788 1789 if (!type) 1790 type = rdentry->d_inode->i_mode & S_IFMT; 1791 1792 host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 1793 if (host_err) 1794 goto out_nfserr; 1795 1796 if (type != S_IFDIR) { /* It's UNLINK */ 1797 #ifdef MSNFS 1798 if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && 1799 (atomic_read(&rdentry->d_count) > 1)) { 1800 host_err = -EPERM; 1801 } else 1802 #endif 1803 host_err = vfs_unlink(dirp, rdentry); 1804 } else { /* It's RMDIR */ 1805 host_err = vfs_rmdir(dirp, rdentry); 1806 } 1807 1808 dput(rdentry); 1809 1810 if (host_err) 1811 goto out_drop; 1812 if (EX_ISSYNC(fhp->fh_export)) 1813 host_err = nfsd_sync_dir(dentry); 1814 1815 out_drop: 1816 mnt_drop_write(fhp->fh_export->ex_path.mnt); 1817 out_nfserr: 1818 err = nfserrno(host_err); 1819 out: 1820 return err; 1821 } 1822 1823 /* 1824 * Read entries from a directory. 1825 * The NFSv3/4 verifier we ignore for now. 1826 */ 1827 __be32 1828 nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, 1829 struct readdir_cd *cdp, filldir_t func) 1830 { 1831 __be32 err; 1832 int host_err; 1833 struct file *file; 1834 loff_t offset = *offsetp; 1835 1836 err = nfsd_open(rqstp, fhp, S_IFDIR, NFSD_MAY_READ, &file); 1837 if (err) 1838 goto out; 1839 1840 offset = vfs_llseek(file, offset, 0); 1841 if (offset < 0) { 1842 err = nfserrno((int)offset); 1843 goto out_close; 1844 } 1845 1846 /* 1847 * Read the directory entries. This silly loop is necessary because 1848 * readdir() is not guaranteed to fill up the entire buffer, but 1849 * may choose to do less. 1850 */ 1851 1852 do { 1853 cdp->err = nfserr_eof; /* will be cleared on successful read */ 1854 host_err = vfs_readdir(file, func, cdp); 1855 } while (host_err >=0 && cdp->err == nfs_ok); 1856 if (host_err) 1857 err = nfserrno(host_err); 1858 else 1859 err = cdp->err; 1860 *offsetp = vfs_llseek(file, 0, 1); 1861 1862 if (err == nfserr_eof || err == nfserr_toosmall) 1863 err = nfs_ok; /* can still be found in ->err */ 1864 out_close: 1865 nfsd_close(file); 1866 out: 1867 return err; 1868 } 1869 1870 /* 1871 * Get file system stats 1872 * N.B. After this call fhp needs an fh_put 1873 */ 1874 __be32 1875 nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat) 1876 { 1877 __be32 err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP); 1878 if (!err && vfs_statfs(fhp->fh_dentry,stat)) 1879 err = nfserr_io; 1880 return err; 1881 } 1882 1883 static int exp_rdonly(struct svc_rqst *rqstp, struct svc_export *exp) 1884 { 1885 return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY; 1886 } 1887 1888 /* 1889 * Check for a user's access permissions to this inode. 1890 */ 1891 __be32 1892 nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp, 1893 struct dentry *dentry, int acc) 1894 { 1895 struct inode *inode = dentry->d_inode; 1896 int err; 1897 1898 if (acc == NFSD_MAY_NOP) 1899 return 0; 1900 #if 0 1901 dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n", 1902 acc, 1903 (acc & NFSD_MAY_READ)? " read" : "", 1904 (acc & NFSD_MAY_WRITE)? " write" : "", 1905 (acc & NFSD_MAY_EXEC)? " exec" : "", 1906 (acc & NFSD_MAY_SATTR)? " sattr" : "", 1907 (acc & NFSD_MAY_TRUNC)? " trunc" : "", 1908 (acc & NFSD_MAY_LOCK)? " lock" : "", 1909 (acc & NFSD_MAY_OWNER_OVERRIDE)? " owneroverride" : "", 1910 inode->i_mode, 1911 IS_IMMUTABLE(inode)? " immut" : "", 1912 IS_APPEND(inode)? " append" : "", 1913 __mnt_is_readonly(exp->ex_path.mnt)? " ro" : ""); 1914 dprintk(" owner %d/%d user %d/%d\n", 1915 inode->i_uid, inode->i_gid, current->fsuid, current->fsgid); 1916 #endif 1917 1918 /* Normally we reject any write/sattr etc access on a read-only file 1919 * system. But if it is IRIX doing check on write-access for a 1920 * device special file, we ignore rofs. 1921 */ 1922 if (!(acc & NFSD_MAY_LOCAL_ACCESS)) 1923 if (acc & (NFSD_MAY_WRITE | NFSD_MAY_SATTR | NFSD_MAY_TRUNC)) { 1924 if (exp_rdonly(rqstp, exp) || 1925 __mnt_is_readonly(exp->ex_path.mnt)) 1926 return nfserr_rofs; 1927 if (/* (acc & NFSD_MAY_WRITE) && */ IS_IMMUTABLE(inode)) 1928 return nfserr_perm; 1929 } 1930 if ((acc & NFSD_MAY_TRUNC) && IS_APPEND(inode)) 1931 return nfserr_perm; 1932 1933 if (acc & NFSD_MAY_LOCK) { 1934 /* If we cannot rely on authentication in NLM requests, 1935 * just allow locks, otherwise require read permission, or 1936 * ownership 1937 */ 1938 if (exp->ex_flags & NFSEXP_NOAUTHNLM) 1939 return 0; 1940 else 1941 acc = NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE; 1942 } 1943 /* 1944 * The file owner always gets access permission for accesses that 1945 * would normally be checked at open time. This is to make 1946 * file access work even when the client has done a fchmod(fd, 0). 1947 * 1948 * However, `cp foo bar' should fail nevertheless when bar is 1949 * readonly. A sensible way to do this might be to reject all 1950 * attempts to truncate a read-only file, because a creat() call 1951 * always implies file truncation. 1952 * ... but this isn't really fair. A process may reasonably call 1953 * ftruncate on an open file descriptor on a file with perm 000. 1954 * We must trust the client to do permission checking - using "ACCESS" 1955 * with NFSv3. 1956 */ 1957 if ((acc & NFSD_MAY_OWNER_OVERRIDE) && 1958 inode->i_uid == current->fsuid) 1959 return 0; 1960 1961 /* This assumes NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */ 1962 err = permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC), NULL); 1963 1964 /* Allow read access to binaries even when mode 111 */ 1965 if (err == -EACCES && S_ISREG(inode->i_mode) && 1966 acc == (NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE)) 1967 err = permission(inode, MAY_EXEC, NULL); 1968 1969 return err? nfserrno(err) : 0; 1970 } 1971 1972 void 1973 nfsd_racache_shutdown(void) 1974 { 1975 if (!raparml) 1976 return; 1977 dprintk("nfsd: freeing readahead buffers.\n"); 1978 kfree(raparml); 1979 raparml = NULL; 1980 } 1981 /* 1982 * Initialize readahead param cache 1983 */ 1984 int 1985 nfsd_racache_init(int cache_size) 1986 { 1987 int i; 1988 int j = 0; 1989 int nperbucket; 1990 1991 1992 if (raparml) 1993 return 0; 1994 if (cache_size < 2*RAPARM_HASH_SIZE) 1995 cache_size = 2*RAPARM_HASH_SIZE; 1996 raparml = kcalloc(cache_size, sizeof(struct raparms), GFP_KERNEL); 1997 1998 if (!raparml) { 1999 printk(KERN_WARNING 2000 "nfsd: Could not allocate memory read-ahead cache.\n"); 2001 return -ENOMEM; 2002 } 2003 2004 dprintk("nfsd: allocating %d readahead buffers.\n", cache_size); 2005 for (i = 0 ; i < RAPARM_HASH_SIZE ; i++) { 2006 raparm_hash[i].pb_head = NULL; 2007 spin_lock_init(&raparm_hash[i].pb_lock); 2008 } 2009 nperbucket = DIV_ROUND_UP(cache_size, RAPARM_HASH_SIZE); 2010 for (i = 0; i < cache_size - 1; i++) { 2011 if (i % nperbucket == 0) 2012 raparm_hash[j++].pb_head = raparml + i; 2013 if (i % nperbucket < nperbucket-1) 2014 raparml[i].p_next = raparml + i + 1; 2015 } 2016 2017 nfsdstats.ra_size = cache_size; 2018 return 0; 2019 } 2020 2021 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) 2022 struct posix_acl * 2023 nfsd_get_posix_acl(struct svc_fh *fhp, int type) 2024 { 2025 struct inode *inode = fhp->fh_dentry->d_inode; 2026 char *name; 2027 void *value = NULL; 2028 ssize_t size; 2029 struct posix_acl *acl; 2030 2031 if (!IS_POSIXACL(inode)) 2032 return ERR_PTR(-EOPNOTSUPP); 2033 2034 switch (type) { 2035 case ACL_TYPE_ACCESS: 2036 name = POSIX_ACL_XATTR_ACCESS; 2037 break; 2038 case ACL_TYPE_DEFAULT: 2039 name = POSIX_ACL_XATTR_DEFAULT; 2040 break; 2041 default: 2042 return ERR_PTR(-EOPNOTSUPP); 2043 } 2044 2045 size = nfsd_getxattr(fhp->fh_dentry, name, &value); 2046 if (size < 0) 2047 return ERR_PTR(size); 2048 2049 acl = posix_acl_from_xattr(value, size); 2050 kfree(value); 2051 return acl; 2052 } 2053 2054 int 2055 nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl) 2056 { 2057 struct inode *inode = fhp->fh_dentry->d_inode; 2058 char *name; 2059 void *value = NULL; 2060 size_t size; 2061 int error; 2062 2063 if (!IS_POSIXACL(inode) || !inode->i_op || 2064 !inode->i_op->setxattr || !inode->i_op->removexattr) 2065 return -EOPNOTSUPP; 2066 switch(type) { 2067 case ACL_TYPE_ACCESS: 2068 name = POSIX_ACL_XATTR_ACCESS; 2069 break; 2070 case ACL_TYPE_DEFAULT: 2071 name = POSIX_ACL_XATTR_DEFAULT; 2072 break; 2073 default: 2074 return -EOPNOTSUPP; 2075 } 2076 2077 if (acl && acl->a_count) { 2078 size = posix_acl_xattr_size(acl->a_count); 2079 value = kmalloc(size, GFP_KERNEL); 2080 if (!value) 2081 return -ENOMEM; 2082 error = posix_acl_to_xattr(acl, value, size); 2083 if (error < 0) 2084 goto getout; 2085 size = error; 2086 } else 2087 size = 0; 2088 2089 error = mnt_want_write(fhp->fh_export->ex_path.mnt); 2090 if (error) 2091 goto getout; 2092 if (size) 2093 error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0); 2094 else { 2095 if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT) 2096 error = 0; 2097 else { 2098 error = vfs_removexattr(fhp->fh_dentry, name); 2099 if (error == -ENODATA) 2100 error = 0; 2101 } 2102 } 2103 mnt_drop_write(fhp->fh_export->ex_path.mnt); 2104 2105 getout: 2106 kfree(value); 2107 return error; 2108 } 2109 #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ 2110