1 /* 2 * Copyright (c) 2000-2005 Silicon Graphics, Inc. 3 * All Rights Reserved. 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it would be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18 #include "xfs.h" 19 #include "xfs_fs.h" 20 #include "xfs_shared.h" 21 #include "xfs_format.h" 22 #include "xfs_log_format.h" 23 #include "xfs_trans_resv.h" 24 #include "xfs_sb.h" 25 #include "xfs_ag.h" 26 #include "xfs_mount.h" 27 #include "xfs_da_format.h" 28 #include "xfs_inode.h" 29 #include "xfs_bmap.h" 30 #include "xfs_bmap_util.h" 31 #include "xfs_acl.h" 32 #include "xfs_quota.h" 33 #include "xfs_error.h" 34 #include "xfs_attr.h" 35 #include "xfs_trans.h" 36 #include "xfs_trace.h" 37 #include "xfs_icache.h" 38 #include "xfs_symlink.h" 39 #include "xfs_da_btree.h" 40 #include "xfs_dir2_priv.h" 41 #include "xfs_dinode.h" 42 43 #include <linux/capability.h> 44 #include <linux/xattr.h> 45 #include <linux/namei.h> 46 #include <linux/posix_acl.h> 47 #include <linux/security.h> 48 #include <linux/fiemap.h> 49 #include <linux/slab.h> 50 51 static int 52 xfs_initxattrs( 53 struct inode *inode, 54 const struct xattr *xattr_array, 55 void *fs_info) 56 { 57 const struct xattr *xattr; 58 struct xfs_inode *ip = XFS_I(inode); 59 int error = 0; 60 61 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 62 error = xfs_attr_set(ip, xattr->name, xattr->value, 63 xattr->value_len, ATTR_SECURE); 64 if (error < 0) 65 break; 66 } 67 return error; 68 } 69 70 /* 71 * Hook in SELinux. This is not quite correct yet, what we really need 72 * here (as we do for default ACLs) is a mechanism by which creation of 73 * these attrs can be journalled at inode creation time (along with the 74 * inode, of course, such that log replay can't cause these to be lost). 75 */ 76 77 STATIC int 78 xfs_init_security( 79 struct inode *inode, 80 struct inode *dir, 81 const struct qstr *qstr) 82 { 83 return security_inode_init_security(inode, dir, qstr, 84 &xfs_initxattrs, NULL); 85 } 86 87 static void 88 xfs_dentry_to_name( 89 struct xfs_name *namep, 90 struct dentry *dentry, 91 int mode) 92 { 93 namep->name = dentry->d_name.name; 94 namep->len = dentry->d_name.len; 95 namep->type = xfs_mode_to_ftype[(mode & S_IFMT) >> S_SHIFT]; 96 } 97 98 STATIC void 99 xfs_cleanup_inode( 100 struct inode *dir, 101 struct inode *inode, 102 struct dentry *dentry) 103 { 104 struct xfs_name teardown; 105 106 /* Oh, the horror. 107 * If we can't add the ACL or we fail in 108 * xfs_init_security we must back out. 109 * ENOSPC can hit here, among other things. 110 */ 111 xfs_dentry_to_name(&teardown, dentry, 0); 112 113 xfs_remove(XFS_I(dir), &teardown, XFS_I(inode)); 114 iput(inode); 115 } 116 117 STATIC int 118 xfs_vn_mknod( 119 struct inode *dir, 120 struct dentry *dentry, 121 umode_t mode, 122 dev_t rdev) 123 { 124 struct inode *inode; 125 struct xfs_inode *ip = NULL; 126 struct posix_acl *default_acl, *acl; 127 struct xfs_name name; 128 int error; 129 130 /* 131 * Irix uses Missed'em'V split, but doesn't want to see 132 * the upper 5 bits of (14bit) major. 133 */ 134 if (S_ISCHR(mode) || S_ISBLK(mode)) { 135 if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff)) 136 return -EINVAL; 137 rdev = sysv_encode_dev(rdev); 138 } else { 139 rdev = 0; 140 } 141 142 error = posix_acl_create(dir, &mode, &default_acl, &acl); 143 if (error) 144 return error; 145 146 xfs_dentry_to_name(&name, dentry, mode); 147 error = xfs_create(XFS_I(dir), &name, mode, rdev, &ip); 148 if (unlikely(error)) 149 goto out_free_acl; 150 151 inode = VFS_I(ip); 152 153 error = xfs_init_security(inode, dir, &dentry->d_name); 154 if (unlikely(error)) 155 goto out_cleanup_inode; 156 157 #ifdef CONFIG_XFS_POSIX_ACL 158 if (default_acl) { 159 error = xfs_set_acl(inode, default_acl, ACL_TYPE_DEFAULT); 160 if (error) 161 goto out_cleanup_inode; 162 } 163 if (acl) { 164 error = xfs_set_acl(inode, acl, ACL_TYPE_ACCESS); 165 if (error) 166 goto out_cleanup_inode; 167 } 168 #endif 169 170 d_instantiate(dentry, inode); 171 out_free_acl: 172 if (default_acl) 173 posix_acl_release(default_acl); 174 if (acl) 175 posix_acl_release(acl); 176 return -error; 177 178 out_cleanup_inode: 179 xfs_cleanup_inode(dir, inode, dentry); 180 goto out_free_acl; 181 } 182 183 STATIC int 184 xfs_vn_create( 185 struct inode *dir, 186 struct dentry *dentry, 187 umode_t mode, 188 bool flags) 189 { 190 return xfs_vn_mknod(dir, dentry, mode, 0); 191 } 192 193 STATIC int 194 xfs_vn_mkdir( 195 struct inode *dir, 196 struct dentry *dentry, 197 umode_t mode) 198 { 199 return xfs_vn_mknod(dir, dentry, mode|S_IFDIR, 0); 200 } 201 202 STATIC struct dentry * 203 xfs_vn_lookup( 204 struct inode *dir, 205 struct dentry *dentry, 206 unsigned int flags) 207 { 208 struct xfs_inode *cip; 209 struct xfs_name name; 210 int error; 211 212 if (dentry->d_name.len >= MAXNAMELEN) 213 return ERR_PTR(-ENAMETOOLONG); 214 215 xfs_dentry_to_name(&name, dentry, 0); 216 error = xfs_lookup(XFS_I(dir), &name, &cip, NULL); 217 if (unlikely(error)) { 218 if (unlikely(error != ENOENT)) 219 return ERR_PTR(-error); 220 d_add(dentry, NULL); 221 return NULL; 222 } 223 224 return d_splice_alias(VFS_I(cip), dentry); 225 } 226 227 STATIC struct dentry * 228 xfs_vn_ci_lookup( 229 struct inode *dir, 230 struct dentry *dentry, 231 unsigned int flags) 232 { 233 struct xfs_inode *ip; 234 struct xfs_name xname; 235 struct xfs_name ci_name; 236 struct qstr dname; 237 int error; 238 239 if (dentry->d_name.len >= MAXNAMELEN) 240 return ERR_PTR(-ENAMETOOLONG); 241 242 xfs_dentry_to_name(&xname, dentry, 0); 243 error = xfs_lookup(XFS_I(dir), &xname, &ip, &ci_name); 244 if (unlikely(error)) { 245 if (unlikely(error != ENOENT)) 246 return ERR_PTR(-error); 247 /* 248 * call d_add(dentry, NULL) here when d_drop_negative_children 249 * is called in xfs_vn_mknod (ie. allow negative dentries 250 * with CI filesystems). 251 */ 252 return NULL; 253 } 254 255 /* if exact match, just splice and exit */ 256 if (!ci_name.name) 257 return d_splice_alias(VFS_I(ip), dentry); 258 259 /* else case-insensitive match... */ 260 dname.name = ci_name.name; 261 dname.len = ci_name.len; 262 dentry = d_add_ci(dentry, VFS_I(ip), &dname); 263 kmem_free(ci_name.name); 264 return dentry; 265 } 266 267 STATIC int 268 xfs_vn_link( 269 struct dentry *old_dentry, 270 struct inode *dir, 271 struct dentry *dentry) 272 { 273 struct inode *inode = old_dentry->d_inode; 274 struct xfs_name name; 275 int error; 276 277 xfs_dentry_to_name(&name, dentry, inode->i_mode); 278 279 error = xfs_link(XFS_I(dir), XFS_I(inode), &name); 280 if (unlikely(error)) 281 return -error; 282 283 ihold(inode); 284 d_instantiate(dentry, inode); 285 return 0; 286 } 287 288 STATIC int 289 xfs_vn_unlink( 290 struct inode *dir, 291 struct dentry *dentry) 292 { 293 struct xfs_name name; 294 int error; 295 296 xfs_dentry_to_name(&name, dentry, 0); 297 298 error = -xfs_remove(XFS_I(dir), &name, XFS_I(dentry->d_inode)); 299 if (error) 300 return error; 301 302 /* 303 * With unlink, the VFS makes the dentry "negative": no inode, 304 * but still hashed. This is incompatible with case-insensitive 305 * mode, so invalidate (unhash) the dentry in CI-mode. 306 */ 307 if (xfs_sb_version_hasasciici(&XFS_M(dir->i_sb)->m_sb)) 308 d_invalidate(dentry); 309 return 0; 310 } 311 312 STATIC int 313 xfs_vn_symlink( 314 struct inode *dir, 315 struct dentry *dentry, 316 const char *symname) 317 { 318 struct inode *inode; 319 struct xfs_inode *cip = NULL; 320 struct xfs_name name; 321 int error; 322 umode_t mode; 323 324 mode = S_IFLNK | 325 (irix_symlink_mode ? 0777 & ~current_umask() : S_IRWXUGO); 326 xfs_dentry_to_name(&name, dentry, mode); 327 328 error = xfs_symlink(XFS_I(dir), &name, symname, mode, &cip); 329 if (unlikely(error)) 330 goto out; 331 332 inode = VFS_I(cip); 333 334 error = xfs_init_security(inode, dir, &dentry->d_name); 335 if (unlikely(error)) 336 goto out_cleanup_inode; 337 338 d_instantiate(dentry, inode); 339 return 0; 340 341 out_cleanup_inode: 342 xfs_cleanup_inode(dir, inode, dentry); 343 out: 344 return -error; 345 } 346 347 STATIC int 348 xfs_vn_rename( 349 struct inode *odir, 350 struct dentry *odentry, 351 struct inode *ndir, 352 struct dentry *ndentry) 353 { 354 struct inode *new_inode = ndentry->d_inode; 355 struct xfs_name oname; 356 struct xfs_name nname; 357 358 xfs_dentry_to_name(&oname, odentry, 0); 359 xfs_dentry_to_name(&nname, ndentry, odentry->d_inode->i_mode); 360 361 return -xfs_rename(XFS_I(odir), &oname, XFS_I(odentry->d_inode), 362 XFS_I(ndir), &nname, new_inode ? 363 XFS_I(new_inode) : NULL); 364 } 365 366 /* 367 * careful here - this function can get called recursively, so 368 * we need to be very careful about how much stack we use. 369 * uio is kmalloced for this reason... 370 */ 371 STATIC void * 372 xfs_vn_follow_link( 373 struct dentry *dentry, 374 struct nameidata *nd) 375 { 376 char *link; 377 int error = -ENOMEM; 378 379 link = kmalloc(MAXPATHLEN+1, GFP_KERNEL); 380 if (!link) 381 goto out_err; 382 383 error = -xfs_readlink(XFS_I(dentry->d_inode), link); 384 if (unlikely(error)) 385 goto out_kfree; 386 387 nd_set_link(nd, link); 388 return NULL; 389 390 out_kfree: 391 kfree(link); 392 out_err: 393 nd_set_link(nd, ERR_PTR(error)); 394 return NULL; 395 } 396 397 STATIC int 398 xfs_vn_getattr( 399 struct vfsmount *mnt, 400 struct dentry *dentry, 401 struct kstat *stat) 402 { 403 struct inode *inode = dentry->d_inode; 404 struct xfs_inode *ip = XFS_I(inode); 405 struct xfs_mount *mp = ip->i_mount; 406 407 trace_xfs_getattr(ip); 408 409 if (XFS_FORCED_SHUTDOWN(mp)) 410 return -XFS_ERROR(EIO); 411 412 stat->size = XFS_ISIZE(ip); 413 stat->dev = inode->i_sb->s_dev; 414 stat->mode = ip->i_d.di_mode; 415 stat->nlink = ip->i_d.di_nlink; 416 stat->uid = inode->i_uid; 417 stat->gid = inode->i_gid; 418 stat->ino = ip->i_ino; 419 stat->atime = inode->i_atime; 420 stat->mtime = inode->i_mtime; 421 stat->ctime = inode->i_ctime; 422 stat->blocks = 423 XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks); 424 425 426 switch (inode->i_mode & S_IFMT) { 427 case S_IFBLK: 428 case S_IFCHR: 429 stat->blksize = BLKDEV_IOSIZE; 430 stat->rdev = MKDEV(sysv_major(ip->i_df.if_u2.if_rdev) & 0x1ff, 431 sysv_minor(ip->i_df.if_u2.if_rdev)); 432 break; 433 default: 434 if (XFS_IS_REALTIME_INODE(ip)) { 435 /* 436 * If the file blocks are being allocated from a 437 * realtime volume, then return the inode's realtime 438 * extent size or the realtime volume's extent size. 439 */ 440 stat->blksize = 441 xfs_get_extsz_hint(ip) << mp->m_sb.sb_blocklog; 442 } else 443 stat->blksize = xfs_preferred_iosize(mp); 444 stat->rdev = 0; 445 break; 446 } 447 448 return 0; 449 } 450 451 static void 452 xfs_setattr_mode( 453 struct xfs_inode *ip, 454 struct iattr *iattr) 455 { 456 struct inode *inode = VFS_I(ip); 457 umode_t mode = iattr->ia_mode; 458 459 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); 460 461 ip->i_d.di_mode &= S_IFMT; 462 ip->i_d.di_mode |= mode & ~S_IFMT; 463 464 inode->i_mode &= S_IFMT; 465 inode->i_mode |= mode & ~S_IFMT; 466 } 467 468 static void 469 xfs_setattr_time( 470 struct xfs_inode *ip, 471 struct iattr *iattr) 472 { 473 struct inode *inode = VFS_I(ip); 474 475 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); 476 477 if (iattr->ia_valid & ATTR_ATIME) { 478 inode->i_atime = iattr->ia_atime; 479 ip->i_d.di_atime.t_sec = iattr->ia_atime.tv_sec; 480 ip->i_d.di_atime.t_nsec = iattr->ia_atime.tv_nsec; 481 } 482 if (iattr->ia_valid & ATTR_CTIME) { 483 inode->i_ctime = iattr->ia_ctime; 484 ip->i_d.di_ctime.t_sec = iattr->ia_ctime.tv_sec; 485 ip->i_d.di_ctime.t_nsec = iattr->ia_ctime.tv_nsec; 486 } 487 if (iattr->ia_valid & ATTR_MTIME) { 488 inode->i_mtime = iattr->ia_mtime; 489 ip->i_d.di_mtime.t_sec = iattr->ia_mtime.tv_sec; 490 ip->i_d.di_mtime.t_nsec = iattr->ia_mtime.tv_nsec; 491 } 492 } 493 494 int 495 xfs_setattr_nonsize( 496 struct xfs_inode *ip, 497 struct iattr *iattr, 498 int flags) 499 { 500 xfs_mount_t *mp = ip->i_mount; 501 struct inode *inode = VFS_I(ip); 502 int mask = iattr->ia_valid; 503 xfs_trans_t *tp; 504 int error; 505 kuid_t uid = GLOBAL_ROOT_UID, iuid = GLOBAL_ROOT_UID; 506 kgid_t gid = GLOBAL_ROOT_GID, igid = GLOBAL_ROOT_GID; 507 struct xfs_dquot *udqp = NULL, *gdqp = NULL; 508 struct xfs_dquot *olddquot1 = NULL, *olddquot2 = NULL; 509 510 trace_xfs_setattr(ip); 511 512 /* If acls are being inherited, we already have this checked */ 513 if (!(flags & XFS_ATTR_NOACL)) { 514 if (mp->m_flags & XFS_MOUNT_RDONLY) 515 return XFS_ERROR(EROFS); 516 517 if (XFS_FORCED_SHUTDOWN(mp)) 518 return XFS_ERROR(EIO); 519 520 error = -inode_change_ok(inode, iattr); 521 if (error) 522 return XFS_ERROR(error); 523 } 524 525 ASSERT((mask & ATTR_SIZE) == 0); 526 527 /* 528 * If disk quotas is on, we make sure that the dquots do exist on disk, 529 * before we start any other transactions. Trying to do this later 530 * is messy. We don't care to take a readlock to look at the ids 531 * in inode here, because we can't hold it across the trans_reserve. 532 * If the IDs do change before we take the ilock, we're covered 533 * because the i_*dquot fields will get updated anyway. 534 */ 535 if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) { 536 uint qflags = 0; 537 538 if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) { 539 uid = iattr->ia_uid; 540 qflags |= XFS_QMOPT_UQUOTA; 541 } else { 542 uid = inode->i_uid; 543 } 544 if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) { 545 gid = iattr->ia_gid; 546 qflags |= XFS_QMOPT_GQUOTA; 547 } else { 548 gid = inode->i_gid; 549 } 550 551 /* 552 * We take a reference when we initialize udqp and gdqp, 553 * so it is important that we never blindly double trip on 554 * the same variable. See xfs_create() for an example. 555 */ 556 ASSERT(udqp == NULL); 557 ASSERT(gdqp == NULL); 558 error = xfs_qm_vop_dqalloc(ip, xfs_kuid_to_uid(uid), 559 xfs_kgid_to_gid(gid), 560 xfs_get_projid(ip), 561 qflags, &udqp, &gdqp, NULL); 562 if (error) 563 return error; 564 } 565 566 tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_NOT_SIZE); 567 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_ichange, 0, 0); 568 if (error) 569 goto out_dqrele; 570 571 xfs_ilock(ip, XFS_ILOCK_EXCL); 572 573 /* 574 * Change file ownership. Must be the owner or privileged. 575 */ 576 if (mask & (ATTR_UID|ATTR_GID)) { 577 /* 578 * These IDs could have changed since we last looked at them. 579 * But, we're assured that if the ownership did change 580 * while we didn't have the inode locked, inode's dquot(s) 581 * would have changed also. 582 */ 583 iuid = inode->i_uid; 584 igid = inode->i_gid; 585 gid = (mask & ATTR_GID) ? iattr->ia_gid : igid; 586 uid = (mask & ATTR_UID) ? iattr->ia_uid : iuid; 587 588 /* 589 * Do a quota reservation only if uid/gid is actually 590 * going to change. 591 */ 592 if (XFS_IS_QUOTA_RUNNING(mp) && 593 ((XFS_IS_UQUOTA_ON(mp) && !uid_eq(iuid, uid)) || 594 (XFS_IS_GQUOTA_ON(mp) && !gid_eq(igid, gid)))) { 595 ASSERT(tp); 596 error = xfs_qm_vop_chown_reserve(tp, ip, udqp, gdqp, 597 NULL, capable(CAP_FOWNER) ? 598 XFS_QMOPT_FORCE_RES : 0); 599 if (error) /* out of quota */ 600 goto out_trans_cancel; 601 } 602 } 603 604 xfs_trans_ijoin(tp, ip, 0); 605 606 /* 607 * Change file ownership. Must be the owner or privileged. 608 */ 609 if (mask & (ATTR_UID|ATTR_GID)) { 610 /* 611 * CAP_FSETID overrides the following restrictions: 612 * 613 * The set-user-ID and set-group-ID bits of a file will be 614 * cleared upon successful return from chown() 615 */ 616 if ((ip->i_d.di_mode & (S_ISUID|S_ISGID)) && 617 !capable(CAP_FSETID)) 618 ip->i_d.di_mode &= ~(S_ISUID|S_ISGID); 619 620 /* 621 * Change the ownerships and register quota modifications 622 * in the transaction. 623 */ 624 if (!uid_eq(iuid, uid)) { 625 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_UQUOTA_ON(mp)) { 626 ASSERT(mask & ATTR_UID); 627 ASSERT(udqp); 628 olddquot1 = xfs_qm_vop_chown(tp, ip, 629 &ip->i_udquot, udqp); 630 } 631 ip->i_d.di_uid = xfs_kuid_to_uid(uid); 632 inode->i_uid = uid; 633 } 634 if (!gid_eq(igid, gid)) { 635 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_GQUOTA_ON(mp)) { 636 ASSERT(xfs_sb_version_has_pquotino(&mp->m_sb) || 637 !XFS_IS_PQUOTA_ON(mp)); 638 ASSERT(mask & ATTR_GID); 639 ASSERT(gdqp); 640 olddquot2 = xfs_qm_vop_chown(tp, ip, 641 &ip->i_gdquot, gdqp); 642 } 643 ip->i_d.di_gid = xfs_kgid_to_gid(gid); 644 inode->i_gid = gid; 645 } 646 } 647 648 if (mask & ATTR_MODE) 649 xfs_setattr_mode(ip, iattr); 650 if (mask & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME)) 651 xfs_setattr_time(ip, iattr); 652 653 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); 654 655 XFS_STATS_INC(xs_ig_attrchg); 656 657 if (mp->m_flags & XFS_MOUNT_WSYNC) 658 xfs_trans_set_sync(tp); 659 error = xfs_trans_commit(tp, 0); 660 661 xfs_iunlock(ip, XFS_ILOCK_EXCL); 662 663 /* 664 * Release any dquot(s) the inode had kept before chown. 665 */ 666 xfs_qm_dqrele(olddquot1); 667 xfs_qm_dqrele(olddquot2); 668 xfs_qm_dqrele(udqp); 669 xfs_qm_dqrele(gdqp); 670 671 if (error) 672 return XFS_ERROR(error); 673 674 /* 675 * XXX(hch): Updating the ACL entries is not atomic vs the i_mode 676 * update. We could avoid this with linked transactions 677 * and passing down the transaction pointer all the way 678 * to attr_set. No previous user of the generic 679 * Posix ACL code seems to care about this issue either. 680 */ 681 if ((mask & ATTR_MODE) && !(flags & XFS_ATTR_NOACL)) { 682 error = -posix_acl_chmod(inode, inode->i_mode); 683 if (error) 684 return XFS_ERROR(error); 685 } 686 687 return 0; 688 689 out_trans_cancel: 690 xfs_trans_cancel(tp, 0); 691 xfs_iunlock(ip, XFS_ILOCK_EXCL); 692 out_dqrele: 693 xfs_qm_dqrele(udqp); 694 xfs_qm_dqrele(gdqp); 695 return error; 696 } 697 698 /* 699 * Truncate file. Must have write permission and not be a directory. 700 */ 701 int 702 xfs_setattr_size( 703 struct xfs_inode *ip, 704 struct iattr *iattr) 705 { 706 struct xfs_mount *mp = ip->i_mount; 707 struct inode *inode = VFS_I(ip); 708 int mask = iattr->ia_valid; 709 xfs_off_t oldsize, newsize; 710 struct xfs_trans *tp; 711 int error; 712 uint lock_flags = 0; 713 uint commit_flags = 0; 714 715 trace_xfs_setattr(ip); 716 717 if (mp->m_flags & XFS_MOUNT_RDONLY) 718 return XFS_ERROR(EROFS); 719 720 if (XFS_FORCED_SHUTDOWN(mp)) 721 return XFS_ERROR(EIO); 722 723 error = -inode_change_ok(inode, iattr); 724 if (error) 725 return XFS_ERROR(error); 726 727 ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL)); 728 ASSERT(S_ISREG(ip->i_d.di_mode)); 729 ASSERT((mask & (ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET| 730 ATTR_MTIME_SET|ATTR_KILL_PRIV|ATTR_TIMES_SET)) == 0); 731 732 oldsize = inode->i_size; 733 newsize = iattr->ia_size; 734 735 /* 736 * Short circuit the truncate case for zero length files. 737 */ 738 if (newsize == 0 && oldsize == 0 && ip->i_d.di_nextents == 0) { 739 if (!(mask & (ATTR_CTIME|ATTR_MTIME))) 740 return 0; 741 742 /* 743 * Use the regular setattr path to update the timestamps. 744 */ 745 iattr->ia_valid &= ~ATTR_SIZE; 746 return xfs_setattr_nonsize(ip, iattr, 0); 747 } 748 749 /* 750 * Make sure that the dquots are attached to the inode. 751 */ 752 error = xfs_qm_dqattach(ip, 0); 753 if (error) 754 return error; 755 756 /* 757 * Now we can make the changes. Before we join the inode to the 758 * transaction, take care of the part of the truncation that must be 759 * done without the inode lock. This needs to be done before joining 760 * the inode to the transaction, because the inode cannot be unlocked 761 * once it is a part of the transaction. 762 */ 763 if (newsize > oldsize) { 764 /* 765 * Do the first part of growing a file: zero any data in the 766 * last block that is beyond the old EOF. We need to do this 767 * before the inode is joined to the transaction to modify 768 * i_size. 769 */ 770 error = xfs_zero_eof(ip, newsize, oldsize); 771 if (error) 772 return error; 773 } 774 775 /* 776 * We are going to log the inode size change in this transaction so 777 * any previous writes that are beyond the on disk EOF and the new 778 * EOF that have not been written out need to be written here. If we 779 * do not write the data out, we expose ourselves to the null files 780 * problem. 781 * 782 * Only flush from the on disk size to the smaller of the in memory 783 * file size or the new size as that's the range we really care about 784 * here and prevents waiting for other data not within the range we 785 * care about here. 786 */ 787 if (oldsize != ip->i_d.di_size && newsize > ip->i_d.di_size) { 788 error = -filemap_write_and_wait_range(VFS_I(ip)->i_mapping, 789 ip->i_d.di_size, newsize); 790 if (error) 791 return error; 792 } 793 794 /* 795 * Wait for all direct I/O to complete. 796 */ 797 inode_dio_wait(inode); 798 799 error = -block_truncate_page(inode->i_mapping, newsize, xfs_get_blocks); 800 if (error) 801 return error; 802 803 tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_SIZE); 804 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_itruncate, 0, 0); 805 if (error) 806 goto out_trans_cancel; 807 808 truncate_setsize(inode, newsize); 809 810 commit_flags = XFS_TRANS_RELEASE_LOG_RES; 811 lock_flags |= XFS_ILOCK_EXCL; 812 813 xfs_ilock(ip, XFS_ILOCK_EXCL); 814 815 xfs_trans_ijoin(tp, ip, 0); 816 817 /* 818 * Only change the c/mtime if we are changing the size or we are 819 * explicitly asked to change it. This handles the semantic difference 820 * between truncate() and ftruncate() as implemented in the VFS. 821 * 822 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a 823 * special case where we need to update the times despite not having 824 * these flags set. For all other operations the VFS set these flags 825 * explicitly if it wants a timestamp update. 826 */ 827 if (newsize != oldsize && (!(mask & (ATTR_CTIME | ATTR_MTIME)))) { 828 iattr->ia_ctime = iattr->ia_mtime = 829 current_fs_time(inode->i_sb); 830 mask |= ATTR_CTIME | ATTR_MTIME; 831 } 832 833 /* 834 * The first thing we do is set the size to new_size permanently on 835 * disk. This way we don't have to worry about anyone ever being able 836 * to look at the data being freed even in the face of a crash. 837 * What we're getting around here is the case where we free a block, it 838 * is allocated to another file, it is written to, and then we crash. 839 * If the new data gets written to the file but the log buffers 840 * containing the free and reallocation don't, then we'd end up with 841 * garbage in the blocks being freed. As long as we make the new size 842 * permanent before actually freeing any blocks it doesn't matter if 843 * they get written to. 844 */ 845 ip->i_d.di_size = newsize; 846 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); 847 848 if (newsize <= oldsize) { 849 error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, newsize); 850 if (error) 851 goto out_trans_abort; 852 853 /* 854 * Truncated "down", so we're removing references to old data 855 * here - if we delay flushing for a long time, we expose 856 * ourselves unduly to the notorious NULL files problem. So, 857 * we mark this inode and flush it when the file is closed, 858 * and do not wait the usual (long) time for writeout. 859 */ 860 xfs_iflags_set(ip, XFS_ITRUNCATED); 861 862 /* A truncate down always removes post-EOF blocks. */ 863 xfs_inode_clear_eofblocks_tag(ip); 864 } 865 866 if (mask & ATTR_MODE) 867 xfs_setattr_mode(ip, iattr); 868 if (mask & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME)) 869 xfs_setattr_time(ip, iattr); 870 871 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); 872 873 XFS_STATS_INC(xs_ig_attrchg); 874 875 if (mp->m_flags & XFS_MOUNT_WSYNC) 876 xfs_trans_set_sync(tp); 877 878 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); 879 out_unlock: 880 if (lock_flags) 881 xfs_iunlock(ip, lock_flags); 882 return error; 883 884 out_trans_abort: 885 commit_flags |= XFS_TRANS_ABORT; 886 out_trans_cancel: 887 xfs_trans_cancel(tp, commit_flags); 888 goto out_unlock; 889 } 890 891 STATIC int 892 xfs_vn_setattr( 893 struct dentry *dentry, 894 struct iattr *iattr) 895 { 896 struct xfs_inode *ip = XFS_I(dentry->d_inode); 897 int error; 898 899 if (iattr->ia_valid & ATTR_SIZE) { 900 xfs_ilock(ip, XFS_IOLOCK_EXCL); 901 error = xfs_setattr_size(ip, iattr); 902 xfs_iunlock(ip, XFS_IOLOCK_EXCL); 903 } else { 904 error = xfs_setattr_nonsize(ip, iattr, 0); 905 } 906 907 return -error; 908 } 909 910 STATIC int 911 xfs_vn_update_time( 912 struct inode *inode, 913 struct timespec *now, 914 int flags) 915 { 916 struct xfs_inode *ip = XFS_I(inode); 917 struct xfs_mount *mp = ip->i_mount; 918 struct xfs_trans *tp; 919 int error; 920 921 trace_xfs_update_time(ip); 922 923 tp = xfs_trans_alloc(mp, XFS_TRANS_FSYNC_TS); 924 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_fsyncts, 0, 0); 925 if (error) { 926 xfs_trans_cancel(tp, 0); 927 return -error; 928 } 929 930 xfs_ilock(ip, XFS_ILOCK_EXCL); 931 if (flags & S_CTIME) { 932 inode->i_ctime = *now; 933 ip->i_d.di_ctime.t_sec = (__int32_t)now->tv_sec; 934 ip->i_d.di_ctime.t_nsec = (__int32_t)now->tv_nsec; 935 } 936 if (flags & S_MTIME) { 937 inode->i_mtime = *now; 938 ip->i_d.di_mtime.t_sec = (__int32_t)now->tv_sec; 939 ip->i_d.di_mtime.t_nsec = (__int32_t)now->tv_nsec; 940 } 941 if (flags & S_ATIME) { 942 inode->i_atime = *now; 943 ip->i_d.di_atime.t_sec = (__int32_t)now->tv_sec; 944 ip->i_d.di_atime.t_nsec = (__int32_t)now->tv_nsec; 945 } 946 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); 947 xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP); 948 return -xfs_trans_commit(tp, 0); 949 } 950 951 #define XFS_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC|FIEMAP_FLAG_XATTR) 952 953 /* 954 * Call fiemap helper to fill in user data. 955 * Returns positive errors to xfs_getbmap. 956 */ 957 STATIC int 958 xfs_fiemap_format( 959 void **arg, 960 struct getbmapx *bmv, 961 int *full) 962 { 963 int error; 964 struct fiemap_extent_info *fieinfo = *arg; 965 u32 fiemap_flags = 0; 966 u64 logical, physical, length; 967 968 /* Do nothing for a hole */ 969 if (bmv->bmv_block == -1LL) 970 return 0; 971 972 logical = BBTOB(bmv->bmv_offset); 973 physical = BBTOB(bmv->bmv_block); 974 length = BBTOB(bmv->bmv_length); 975 976 if (bmv->bmv_oflags & BMV_OF_PREALLOC) 977 fiemap_flags |= FIEMAP_EXTENT_UNWRITTEN; 978 else if (bmv->bmv_oflags & BMV_OF_DELALLOC) { 979 fiemap_flags |= (FIEMAP_EXTENT_DELALLOC | 980 FIEMAP_EXTENT_UNKNOWN); 981 physical = 0; /* no block yet */ 982 } 983 if (bmv->bmv_oflags & BMV_OF_LAST) 984 fiemap_flags |= FIEMAP_EXTENT_LAST; 985 986 error = fiemap_fill_next_extent(fieinfo, logical, physical, 987 length, fiemap_flags); 988 if (error > 0) { 989 error = 0; 990 *full = 1; /* user array now full */ 991 } 992 993 return -error; 994 } 995 996 STATIC int 997 xfs_vn_fiemap( 998 struct inode *inode, 999 struct fiemap_extent_info *fieinfo, 1000 u64 start, 1001 u64 length) 1002 { 1003 xfs_inode_t *ip = XFS_I(inode); 1004 struct getbmapx bm; 1005 int error; 1006 1007 error = fiemap_check_flags(fieinfo, XFS_FIEMAP_FLAGS); 1008 if (error) 1009 return error; 1010 1011 /* Set up bmap header for xfs internal routine */ 1012 bm.bmv_offset = BTOBB(start); 1013 /* Special case for whole file */ 1014 if (length == FIEMAP_MAX_OFFSET) 1015 bm.bmv_length = -1LL; 1016 else 1017 bm.bmv_length = BTOBB(length); 1018 1019 /* We add one because in getbmap world count includes the header */ 1020 bm.bmv_count = !fieinfo->fi_extents_max ? MAXEXTNUM : 1021 fieinfo->fi_extents_max + 1; 1022 bm.bmv_count = min_t(__s32, bm.bmv_count, 1023 (PAGE_SIZE * 16 / sizeof(struct getbmapx))); 1024 bm.bmv_iflags = BMV_IF_PREALLOC | BMV_IF_NO_HOLES; 1025 if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) 1026 bm.bmv_iflags |= BMV_IF_ATTRFORK; 1027 if (!(fieinfo->fi_flags & FIEMAP_FLAG_SYNC)) 1028 bm.bmv_iflags |= BMV_IF_DELALLOC; 1029 1030 error = xfs_getbmap(ip, &bm, xfs_fiemap_format, fieinfo); 1031 if (error) 1032 return -error; 1033 1034 return 0; 1035 } 1036 1037 static const struct inode_operations xfs_inode_operations = { 1038 .get_acl = xfs_get_acl, 1039 .set_acl = xfs_set_acl, 1040 .getattr = xfs_vn_getattr, 1041 .setattr = xfs_vn_setattr, 1042 .setxattr = generic_setxattr, 1043 .getxattr = generic_getxattr, 1044 .removexattr = generic_removexattr, 1045 .listxattr = xfs_vn_listxattr, 1046 .fiemap = xfs_vn_fiemap, 1047 .update_time = xfs_vn_update_time, 1048 }; 1049 1050 static const struct inode_operations xfs_dir_inode_operations = { 1051 .create = xfs_vn_create, 1052 .lookup = xfs_vn_lookup, 1053 .link = xfs_vn_link, 1054 .unlink = xfs_vn_unlink, 1055 .symlink = xfs_vn_symlink, 1056 .mkdir = xfs_vn_mkdir, 1057 /* 1058 * Yes, XFS uses the same method for rmdir and unlink. 1059 * 1060 * There are some subtile differences deeper in the code, 1061 * but we use S_ISDIR to check for those. 1062 */ 1063 .rmdir = xfs_vn_unlink, 1064 .mknod = xfs_vn_mknod, 1065 .rename = xfs_vn_rename, 1066 .get_acl = xfs_get_acl, 1067 .set_acl = xfs_set_acl, 1068 .getattr = xfs_vn_getattr, 1069 .setattr = xfs_vn_setattr, 1070 .setxattr = generic_setxattr, 1071 .getxattr = generic_getxattr, 1072 .removexattr = generic_removexattr, 1073 .listxattr = xfs_vn_listxattr, 1074 .update_time = xfs_vn_update_time, 1075 }; 1076 1077 static const struct inode_operations xfs_dir_ci_inode_operations = { 1078 .create = xfs_vn_create, 1079 .lookup = xfs_vn_ci_lookup, 1080 .link = xfs_vn_link, 1081 .unlink = xfs_vn_unlink, 1082 .symlink = xfs_vn_symlink, 1083 .mkdir = xfs_vn_mkdir, 1084 /* 1085 * Yes, XFS uses the same method for rmdir and unlink. 1086 * 1087 * There are some subtile differences deeper in the code, 1088 * but we use S_ISDIR to check for those. 1089 */ 1090 .rmdir = xfs_vn_unlink, 1091 .mknod = xfs_vn_mknod, 1092 .rename = xfs_vn_rename, 1093 .get_acl = xfs_get_acl, 1094 .set_acl = xfs_set_acl, 1095 .getattr = xfs_vn_getattr, 1096 .setattr = xfs_vn_setattr, 1097 .setxattr = generic_setxattr, 1098 .getxattr = generic_getxattr, 1099 .removexattr = generic_removexattr, 1100 .listxattr = xfs_vn_listxattr, 1101 .update_time = xfs_vn_update_time, 1102 }; 1103 1104 static const struct inode_operations xfs_symlink_inode_operations = { 1105 .readlink = generic_readlink, 1106 .follow_link = xfs_vn_follow_link, 1107 .put_link = kfree_put_link, 1108 .getattr = xfs_vn_getattr, 1109 .setattr = xfs_vn_setattr, 1110 .setxattr = generic_setxattr, 1111 .getxattr = generic_getxattr, 1112 .removexattr = generic_removexattr, 1113 .listxattr = xfs_vn_listxattr, 1114 .update_time = xfs_vn_update_time, 1115 }; 1116 1117 STATIC void 1118 xfs_diflags_to_iflags( 1119 struct inode *inode, 1120 struct xfs_inode *ip) 1121 { 1122 if (ip->i_d.di_flags & XFS_DIFLAG_IMMUTABLE) 1123 inode->i_flags |= S_IMMUTABLE; 1124 else 1125 inode->i_flags &= ~S_IMMUTABLE; 1126 if (ip->i_d.di_flags & XFS_DIFLAG_APPEND) 1127 inode->i_flags |= S_APPEND; 1128 else 1129 inode->i_flags &= ~S_APPEND; 1130 if (ip->i_d.di_flags & XFS_DIFLAG_SYNC) 1131 inode->i_flags |= S_SYNC; 1132 else 1133 inode->i_flags &= ~S_SYNC; 1134 if (ip->i_d.di_flags & XFS_DIFLAG_NOATIME) 1135 inode->i_flags |= S_NOATIME; 1136 else 1137 inode->i_flags &= ~S_NOATIME; 1138 } 1139 1140 /* 1141 * Initialize the Linux inode, set up the operation vectors and 1142 * unlock the inode. 1143 * 1144 * When reading existing inodes from disk this is called directly 1145 * from xfs_iget, when creating a new inode it is called from 1146 * xfs_ialloc after setting up the inode. 1147 * 1148 * We are always called with an uninitialised linux inode here. 1149 * We need to initialise the necessary fields and take a reference 1150 * on it. 1151 */ 1152 void 1153 xfs_setup_inode( 1154 struct xfs_inode *ip) 1155 { 1156 struct inode *inode = &ip->i_vnode; 1157 gfp_t gfp_mask; 1158 1159 inode->i_ino = ip->i_ino; 1160 inode->i_state = I_NEW; 1161 1162 inode_sb_list_add(inode); 1163 /* make the inode look hashed for the writeback code */ 1164 hlist_add_fake(&inode->i_hash); 1165 1166 inode->i_mode = ip->i_d.di_mode; 1167 set_nlink(inode, ip->i_d.di_nlink); 1168 inode->i_uid = xfs_uid_to_kuid(ip->i_d.di_uid); 1169 inode->i_gid = xfs_gid_to_kgid(ip->i_d.di_gid); 1170 1171 switch (inode->i_mode & S_IFMT) { 1172 case S_IFBLK: 1173 case S_IFCHR: 1174 inode->i_rdev = 1175 MKDEV(sysv_major(ip->i_df.if_u2.if_rdev) & 0x1ff, 1176 sysv_minor(ip->i_df.if_u2.if_rdev)); 1177 break; 1178 default: 1179 inode->i_rdev = 0; 1180 break; 1181 } 1182 1183 inode->i_generation = ip->i_d.di_gen; 1184 i_size_write(inode, ip->i_d.di_size); 1185 inode->i_atime.tv_sec = ip->i_d.di_atime.t_sec; 1186 inode->i_atime.tv_nsec = ip->i_d.di_atime.t_nsec; 1187 inode->i_mtime.tv_sec = ip->i_d.di_mtime.t_sec; 1188 inode->i_mtime.tv_nsec = ip->i_d.di_mtime.t_nsec; 1189 inode->i_ctime.tv_sec = ip->i_d.di_ctime.t_sec; 1190 inode->i_ctime.tv_nsec = ip->i_d.di_ctime.t_nsec; 1191 xfs_diflags_to_iflags(inode, ip); 1192 1193 ip->d_ops = ip->i_mount->m_nondir_inode_ops; 1194 switch (inode->i_mode & S_IFMT) { 1195 case S_IFREG: 1196 inode->i_op = &xfs_inode_operations; 1197 inode->i_fop = &xfs_file_operations; 1198 inode->i_mapping->a_ops = &xfs_address_space_operations; 1199 break; 1200 case S_IFDIR: 1201 if (xfs_sb_version_hasasciici(&XFS_M(inode->i_sb)->m_sb)) 1202 inode->i_op = &xfs_dir_ci_inode_operations; 1203 else 1204 inode->i_op = &xfs_dir_inode_operations; 1205 inode->i_fop = &xfs_dir_file_operations; 1206 ip->d_ops = ip->i_mount->m_dir_inode_ops; 1207 break; 1208 case S_IFLNK: 1209 inode->i_op = &xfs_symlink_inode_operations; 1210 if (!(ip->i_df.if_flags & XFS_IFINLINE)) 1211 inode->i_mapping->a_ops = &xfs_address_space_operations; 1212 break; 1213 default: 1214 inode->i_op = &xfs_inode_operations; 1215 init_special_inode(inode, inode->i_mode, inode->i_rdev); 1216 break; 1217 } 1218 1219 /* 1220 * Ensure all page cache allocations are done from GFP_NOFS context to 1221 * prevent direct reclaim recursion back into the filesystem and blowing 1222 * stacks or deadlocking. 1223 */ 1224 gfp_mask = mapping_gfp_mask(inode->i_mapping); 1225 mapping_set_gfp_mask(inode->i_mapping, (gfp_mask & ~(__GFP_FS))); 1226 1227 /* 1228 * If there is no attribute fork no ACL can exist on this inode, 1229 * and it can't have any file capabilities attached to it either. 1230 */ 1231 if (!XFS_IFORK_Q(ip)) { 1232 inode_has_no_xattr(inode); 1233 cache_no_acl(inode); 1234 } 1235 1236 xfs_iflags_clear(ip, XFS_INEW); 1237 barrier(); 1238 1239 unlock_new_inode(inode); 1240 } 1241