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