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 = NULL; 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 if (IS_POSIXACL(dir)) { 143 default_acl = xfs_get_acl(dir, ACL_TYPE_DEFAULT); 144 if (IS_ERR(default_acl)) 145 return PTR_ERR(default_acl); 146 147 if (!default_acl) 148 mode &= ~current_umask(); 149 } 150 151 xfs_dentry_to_name(&name, dentry, mode); 152 error = xfs_create(XFS_I(dir), &name, mode, rdev, &ip); 153 if (unlikely(error)) 154 goto out_free_acl; 155 156 inode = VFS_I(ip); 157 158 error = xfs_init_security(inode, dir, &dentry->d_name); 159 if (unlikely(error)) 160 goto out_cleanup_inode; 161 162 if (default_acl) { 163 error = -xfs_inherit_acl(inode, default_acl); 164 default_acl = NULL; 165 if (unlikely(error)) 166 goto out_cleanup_inode; 167 } 168 169 170 d_instantiate(dentry, inode); 171 return -error; 172 173 out_cleanup_inode: 174 xfs_cleanup_inode(dir, inode, dentry); 175 out_free_acl: 176 posix_acl_release(default_acl); 177 return -error; 178 } 179 180 STATIC int 181 xfs_vn_create( 182 struct inode *dir, 183 struct dentry *dentry, 184 umode_t mode, 185 bool flags) 186 { 187 return xfs_vn_mknod(dir, dentry, mode, 0); 188 } 189 190 STATIC int 191 xfs_vn_mkdir( 192 struct inode *dir, 193 struct dentry *dentry, 194 umode_t mode) 195 { 196 return xfs_vn_mknod(dir, dentry, mode|S_IFDIR, 0); 197 } 198 199 STATIC struct dentry * 200 xfs_vn_lookup( 201 struct inode *dir, 202 struct dentry *dentry, 203 unsigned int flags) 204 { 205 struct xfs_inode *cip; 206 struct xfs_name name; 207 int error; 208 209 if (dentry->d_name.len >= MAXNAMELEN) 210 return ERR_PTR(-ENAMETOOLONG); 211 212 xfs_dentry_to_name(&name, dentry, 0); 213 error = xfs_lookup(XFS_I(dir), &name, &cip, NULL); 214 if (unlikely(error)) { 215 if (unlikely(error != ENOENT)) 216 return ERR_PTR(-error); 217 d_add(dentry, NULL); 218 return NULL; 219 } 220 221 return d_splice_alias(VFS_I(cip), dentry); 222 } 223 224 STATIC struct dentry * 225 xfs_vn_ci_lookup( 226 struct inode *dir, 227 struct dentry *dentry, 228 unsigned int flags) 229 { 230 struct xfs_inode *ip; 231 struct xfs_name xname; 232 struct xfs_name ci_name; 233 struct qstr dname; 234 int error; 235 236 if (dentry->d_name.len >= MAXNAMELEN) 237 return ERR_PTR(-ENAMETOOLONG); 238 239 xfs_dentry_to_name(&xname, dentry, 0); 240 error = xfs_lookup(XFS_I(dir), &xname, &ip, &ci_name); 241 if (unlikely(error)) { 242 if (unlikely(error != ENOENT)) 243 return ERR_PTR(-error); 244 /* 245 * call d_add(dentry, NULL) here when d_drop_negative_children 246 * is called in xfs_vn_mknod (ie. allow negative dentries 247 * with CI filesystems). 248 */ 249 return NULL; 250 } 251 252 /* if exact match, just splice and exit */ 253 if (!ci_name.name) 254 return d_splice_alias(VFS_I(ip), dentry); 255 256 /* else case-insensitive match... */ 257 dname.name = ci_name.name; 258 dname.len = ci_name.len; 259 dentry = d_add_ci(dentry, VFS_I(ip), &dname); 260 kmem_free(ci_name.name); 261 return dentry; 262 } 263 264 STATIC int 265 xfs_vn_link( 266 struct dentry *old_dentry, 267 struct inode *dir, 268 struct dentry *dentry) 269 { 270 struct inode *inode = old_dentry->d_inode; 271 struct xfs_name name; 272 int error; 273 274 xfs_dentry_to_name(&name, dentry, inode->i_mode); 275 276 error = xfs_link(XFS_I(dir), XFS_I(inode), &name); 277 if (unlikely(error)) 278 return -error; 279 280 ihold(inode); 281 d_instantiate(dentry, inode); 282 return 0; 283 } 284 285 STATIC int 286 xfs_vn_unlink( 287 struct inode *dir, 288 struct dentry *dentry) 289 { 290 struct xfs_name name; 291 int error; 292 293 xfs_dentry_to_name(&name, dentry, 0); 294 295 error = -xfs_remove(XFS_I(dir), &name, XFS_I(dentry->d_inode)); 296 if (error) 297 return error; 298 299 /* 300 * With unlink, the VFS makes the dentry "negative": no inode, 301 * but still hashed. This is incompatible with case-insensitive 302 * mode, so invalidate (unhash) the dentry in CI-mode. 303 */ 304 if (xfs_sb_version_hasasciici(&XFS_M(dir->i_sb)->m_sb)) 305 d_invalidate(dentry); 306 return 0; 307 } 308 309 STATIC int 310 xfs_vn_symlink( 311 struct inode *dir, 312 struct dentry *dentry, 313 const char *symname) 314 { 315 struct inode *inode; 316 struct xfs_inode *cip = NULL; 317 struct xfs_name name; 318 int error; 319 umode_t mode; 320 321 mode = S_IFLNK | 322 (irix_symlink_mode ? 0777 & ~current_umask() : S_IRWXUGO); 323 xfs_dentry_to_name(&name, dentry, mode); 324 325 error = xfs_symlink(XFS_I(dir), &name, symname, mode, &cip); 326 if (unlikely(error)) 327 goto out; 328 329 inode = VFS_I(cip); 330 331 error = xfs_init_security(inode, dir, &dentry->d_name); 332 if (unlikely(error)) 333 goto out_cleanup_inode; 334 335 d_instantiate(dentry, inode); 336 return 0; 337 338 out_cleanup_inode: 339 xfs_cleanup_inode(dir, inode, dentry); 340 out: 341 return -error; 342 } 343 344 STATIC int 345 xfs_vn_rename( 346 struct inode *odir, 347 struct dentry *odentry, 348 struct inode *ndir, 349 struct dentry *ndentry) 350 { 351 struct inode *new_inode = ndentry->d_inode; 352 struct xfs_name oname; 353 struct xfs_name nname; 354 355 xfs_dentry_to_name(&oname, odentry, 0); 356 xfs_dentry_to_name(&nname, ndentry, odentry->d_inode->i_mode); 357 358 return -xfs_rename(XFS_I(odir), &oname, XFS_I(odentry->d_inode), 359 XFS_I(ndir), &nname, new_inode ? 360 XFS_I(new_inode) : NULL); 361 } 362 363 /* 364 * careful here - this function can get called recursively, so 365 * we need to be very careful about how much stack we use. 366 * uio is kmalloced for this reason... 367 */ 368 STATIC void * 369 xfs_vn_follow_link( 370 struct dentry *dentry, 371 struct nameidata *nd) 372 { 373 char *link; 374 int error = -ENOMEM; 375 376 link = kmalloc(MAXPATHLEN+1, GFP_KERNEL); 377 if (!link) 378 goto out_err; 379 380 error = -xfs_readlink(XFS_I(dentry->d_inode), link); 381 if (unlikely(error)) 382 goto out_kfree; 383 384 nd_set_link(nd, link); 385 return NULL; 386 387 out_kfree: 388 kfree(link); 389 out_err: 390 nd_set_link(nd, ERR_PTR(error)); 391 return NULL; 392 } 393 394 STATIC void 395 xfs_vn_put_link( 396 struct dentry *dentry, 397 struct nameidata *nd, 398 void *p) 399 { 400 char *s = nd_get_link(nd); 401 402 if (!IS_ERR(s)) 403 kfree(s); 404 } 405 406 STATIC int 407 xfs_vn_getattr( 408 struct vfsmount *mnt, 409 struct dentry *dentry, 410 struct kstat *stat) 411 { 412 struct inode *inode = dentry->d_inode; 413 struct xfs_inode *ip = XFS_I(inode); 414 struct xfs_mount *mp = ip->i_mount; 415 416 trace_xfs_getattr(ip); 417 418 if (XFS_FORCED_SHUTDOWN(mp)) 419 return -XFS_ERROR(EIO); 420 421 stat->size = XFS_ISIZE(ip); 422 stat->dev = inode->i_sb->s_dev; 423 stat->mode = ip->i_d.di_mode; 424 stat->nlink = ip->i_d.di_nlink; 425 stat->uid = inode->i_uid; 426 stat->gid = inode->i_gid; 427 stat->ino = ip->i_ino; 428 stat->atime = inode->i_atime; 429 stat->mtime = inode->i_mtime; 430 stat->ctime = inode->i_ctime; 431 stat->blocks = 432 XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks); 433 434 435 switch (inode->i_mode & S_IFMT) { 436 case S_IFBLK: 437 case S_IFCHR: 438 stat->blksize = BLKDEV_IOSIZE; 439 stat->rdev = MKDEV(sysv_major(ip->i_df.if_u2.if_rdev) & 0x1ff, 440 sysv_minor(ip->i_df.if_u2.if_rdev)); 441 break; 442 default: 443 if (XFS_IS_REALTIME_INODE(ip)) { 444 /* 445 * If the file blocks are being allocated from a 446 * realtime volume, then return the inode's realtime 447 * extent size or the realtime volume's extent size. 448 */ 449 stat->blksize = 450 xfs_get_extsz_hint(ip) << mp->m_sb.sb_blocklog; 451 } else 452 stat->blksize = xfs_preferred_iosize(mp); 453 stat->rdev = 0; 454 break; 455 } 456 457 return 0; 458 } 459 460 static void 461 xfs_setattr_mode( 462 struct xfs_trans *tp, 463 struct xfs_inode *ip, 464 struct iattr *iattr) 465 { 466 struct inode *inode = VFS_I(ip); 467 umode_t mode = iattr->ia_mode; 468 469 ASSERT(tp); 470 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); 471 472 ip->i_d.di_mode &= S_IFMT; 473 ip->i_d.di_mode |= mode & ~S_IFMT; 474 475 inode->i_mode &= S_IFMT; 476 inode->i_mode |= mode & ~S_IFMT; 477 } 478 479 int 480 xfs_setattr_nonsize( 481 struct xfs_inode *ip, 482 struct iattr *iattr, 483 int flags) 484 { 485 xfs_mount_t *mp = ip->i_mount; 486 struct inode *inode = VFS_I(ip); 487 int mask = iattr->ia_valid; 488 xfs_trans_t *tp; 489 int error; 490 kuid_t uid = GLOBAL_ROOT_UID, iuid = GLOBAL_ROOT_UID; 491 kgid_t gid = GLOBAL_ROOT_GID, igid = GLOBAL_ROOT_GID; 492 struct xfs_dquot *udqp = NULL, *gdqp = NULL; 493 struct xfs_dquot *olddquot1 = NULL, *olddquot2 = NULL; 494 495 trace_xfs_setattr(ip); 496 497 /* If acls are being inherited, we already have this checked */ 498 if (!(flags & XFS_ATTR_NOACL)) { 499 if (mp->m_flags & XFS_MOUNT_RDONLY) 500 return XFS_ERROR(EROFS); 501 502 if (XFS_FORCED_SHUTDOWN(mp)) 503 return XFS_ERROR(EIO); 504 505 error = -inode_change_ok(inode, iattr); 506 if (error) 507 return XFS_ERROR(error); 508 } 509 510 ASSERT((mask & ATTR_SIZE) == 0); 511 512 /* 513 * If disk quotas is on, we make sure that the dquots do exist on disk, 514 * before we start any other transactions. Trying to do this later 515 * is messy. We don't care to take a readlock to look at the ids 516 * in inode here, because we can't hold it across the trans_reserve. 517 * If the IDs do change before we take the ilock, we're covered 518 * because the i_*dquot fields will get updated anyway. 519 */ 520 if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) { 521 uint qflags = 0; 522 523 if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) { 524 uid = iattr->ia_uid; 525 qflags |= XFS_QMOPT_UQUOTA; 526 } else { 527 uid = inode->i_uid; 528 } 529 if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) { 530 gid = iattr->ia_gid; 531 qflags |= XFS_QMOPT_GQUOTA; 532 } else { 533 gid = inode->i_gid; 534 } 535 536 /* 537 * We take a reference when we initialize udqp and gdqp, 538 * so it is important that we never blindly double trip on 539 * the same variable. See xfs_create() for an example. 540 */ 541 ASSERT(udqp == NULL); 542 ASSERT(gdqp == NULL); 543 error = xfs_qm_vop_dqalloc(ip, xfs_kuid_to_uid(uid), 544 xfs_kgid_to_gid(gid), 545 xfs_get_projid(ip), 546 qflags, &udqp, &gdqp, NULL); 547 if (error) 548 return error; 549 } 550 551 tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_NOT_SIZE); 552 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_ichange, 0, 0); 553 if (error) 554 goto out_dqrele; 555 556 xfs_ilock(ip, XFS_ILOCK_EXCL); 557 558 /* 559 * Change file ownership. Must be the owner or privileged. 560 */ 561 if (mask & (ATTR_UID|ATTR_GID)) { 562 /* 563 * These IDs could have changed since we last looked at them. 564 * But, we're assured that if the ownership did change 565 * while we didn't have the inode locked, inode's dquot(s) 566 * would have changed also. 567 */ 568 iuid = inode->i_uid; 569 igid = inode->i_gid; 570 gid = (mask & ATTR_GID) ? iattr->ia_gid : igid; 571 uid = (mask & ATTR_UID) ? iattr->ia_uid : iuid; 572 573 /* 574 * Do a quota reservation only if uid/gid is actually 575 * going to change. 576 */ 577 if (XFS_IS_QUOTA_RUNNING(mp) && 578 ((XFS_IS_UQUOTA_ON(mp) && !uid_eq(iuid, uid)) || 579 (XFS_IS_GQUOTA_ON(mp) && !gid_eq(igid, gid)))) { 580 ASSERT(tp); 581 error = xfs_qm_vop_chown_reserve(tp, ip, udqp, gdqp, 582 NULL, capable(CAP_FOWNER) ? 583 XFS_QMOPT_FORCE_RES : 0); 584 if (error) /* out of quota */ 585 goto out_trans_cancel; 586 } 587 } 588 589 xfs_trans_ijoin(tp, ip, 0); 590 591 /* 592 * Change file ownership. Must be the owner or privileged. 593 */ 594 if (mask & (ATTR_UID|ATTR_GID)) { 595 /* 596 * CAP_FSETID overrides the following restrictions: 597 * 598 * The set-user-ID and set-group-ID bits of a file will be 599 * cleared upon successful return from chown() 600 */ 601 if ((ip->i_d.di_mode & (S_ISUID|S_ISGID)) && 602 !capable(CAP_FSETID)) 603 ip->i_d.di_mode &= ~(S_ISUID|S_ISGID); 604 605 /* 606 * Change the ownerships and register quota modifications 607 * in the transaction. 608 */ 609 if (!uid_eq(iuid, uid)) { 610 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_UQUOTA_ON(mp)) { 611 ASSERT(mask & ATTR_UID); 612 ASSERT(udqp); 613 olddquot1 = xfs_qm_vop_chown(tp, ip, 614 &ip->i_udquot, udqp); 615 } 616 ip->i_d.di_uid = xfs_kuid_to_uid(uid); 617 inode->i_uid = uid; 618 } 619 if (!gid_eq(igid, gid)) { 620 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_GQUOTA_ON(mp)) { 621 ASSERT(!XFS_IS_PQUOTA_ON(mp)); 622 ASSERT(mask & ATTR_GID); 623 ASSERT(gdqp); 624 olddquot2 = xfs_qm_vop_chown(tp, ip, 625 &ip->i_gdquot, gdqp); 626 } 627 ip->i_d.di_gid = xfs_kgid_to_gid(gid); 628 inode->i_gid = gid; 629 } 630 } 631 632 /* 633 * Change file access modes. 634 */ 635 if (mask & ATTR_MODE) 636 xfs_setattr_mode(tp, ip, iattr); 637 638 /* 639 * Change file access or modified times. 640 */ 641 if (mask & ATTR_ATIME) { 642 inode->i_atime = iattr->ia_atime; 643 ip->i_d.di_atime.t_sec = iattr->ia_atime.tv_sec; 644 ip->i_d.di_atime.t_nsec = iattr->ia_atime.tv_nsec; 645 } 646 if (mask & ATTR_CTIME) { 647 inode->i_ctime = iattr->ia_ctime; 648 ip->i_d.di_ctime.t_sec = iattr->ia_ctime.tv_sec; 649 ip->i_d.di_ctime.t_nsec = iattr->ia_ctime.tv_nsec; 650 } 651 if (mask & ATTR_MTIME) { 652 inode->i_mtime = iattr->ia_mtime; 653 ip->i_d.di_mtime.t_sec = iattr->ia_mtime.tv_sec; 654 ip->i_d.di_mtime.t_nsec = iattr->ia_mtime.tv_nsec; 655 } 656 657 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); 658 659 XFS_STATS_INC(xs_ig_attrchg); 660 661 if (mp->m_flags & XFS_MOUNT_WSYNC) 662 xfs_trans_set_sync(tp); 663 error = xfs_trans_commit(tp, 0); 664 665 xfs_iunlock(ip, XFS_ILOCK_EXCL); 666 667 /* 668 * Release any dquot(s) the inode had kept before chown. 669 */ 670 xfs_qm_dqrele(olddquot1); 671 xfs_qm_dqrele(olddquot2); 672 xfs_qm_dqrele(udqp); 673 xfs_qm_dqrele(gdqp); 674 675 if (error) 676 return XFS_ERROR(error); 677 678 /* 679 * XXX(hch): Updating the ACL entries is not atomic vs the i_mode 680 * update. We could avoid this with linked transactions 681 * and passing down the transaction pointer all the way 682 * to attr_set. No previous user of the generic 683 * Posix ACL code seems to care about this issue either. 684 */ 685 if ((mask & ATTR_MODE) && !(flags & XFS_ATTR_NOACL)) { 686 error = -xfs_acl_chmod(inode); 687 if (error) 688 return XFS_ERROR(error); 689 } 690 691 return 0; 692 693 out_trans_cancel: 694 xfs_trans_cancel(tp, 0); 695 xfs_iunlock(ip, XFS_ILOCK_EXCL); 696 out_dqrele: 697 xfs_qm_dqrele(udqp); 698 xfs_qm_dqrele(gdqp); 699 return error; 700 } 701 702 /* 703 * Truncate file. Must have write permission and not be a directory. 704 */ 705 int 706 xfs_setattr_size( 707 struct xfs_inode *ip, 708 struct iattr *iattr) 709 { 710 struct xfs_mount *mp = ip->i_mount; 711 struct inode *inode = VFS_I(ip); 712 int mask = iattr->ia_valid; 713 xfs_off_t oldsize, newsize; 714 struct xfs_trans *tp; 715 int error; 716 uint lock_flags = 0; 717 uint commit_flags = 0; 718 719 trace_xfs_setattr(ip); 720 721 if (mp->m_flags & XFS_MOUNT_RDONLY) 722 return XFS_ERROR(EROFS); 723 724 if (XFS_FORCED_SHUTDOWN(mp)) 725 return XFS_ERROR(EIO); 726 727 error = -inode_change_ok(inode, iattr); 728 if (error) 729 return XFS_ERROR(error); 730 731 ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL)); 732 ASSERT(S_ISREG(ip->i_d.di_mode)); 733 ASSERT((mask & (ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET| 734 ATTR_MTIME_SET|ATTR_KILL_PRIV|ATTR_TIMES_SET)) == 0); 735 736 oldsize = inode->i_size; 737 newsize = iattr->ia_size; 738 739 /* 740 * Short circuit the truncate case for zero length files. 741 */ 742 if (newsize == 0 && oldsize == 0 && ip->i_d.di_nextents == 0) { 743 if (!(mask & (ATTR_CTIME|ATTR_MTIME))) 744 return 0; 745 746 /* 747 * Use the regular setattr path to update the timestamps. 748 */ 749 iattr->ia_valid &= ~ATTR_SIZE; 750 return xfs_setattr_nonsize(ip, iattr, 0); 751 } 752 753 /* 754 * Make sure that the dquots are attached to the inode. 755 */ 756 error = xfs_qm_dqattach(ip, 0); 757 if (error) 758 return error; 759 760 /* 761 * Now we can make the changes. Before we join the inode to the 762 * transaction, take care of the part of the truncation that must be 763 * done without the inode lock. This needs to be done before joining 764 * the inode to the transaction, because the inode cannot be unlocked 765 * once it is a part of the transaction. 766 */ 767 if (newsize > oldsize) { 768 /* 769 * Do the first part of growing a file: zero any data in the 770 * last block that is beyond the old EOF. We need to do this 771 * before the inode is joined to the transaction to modify 772 * i_size. 773 */ 774 error = xfs_zero_eof(ip, newsize, oldsize); 775 if (error) 776 return error; 777 } 778 779 /* 780 * We are going to log the inode size change in this transaction so 781 * any previous writes that are beyond the on disk EOF and the new 782 * EOF that have not been written out need to be written here. If we 783 * do not write the data out, we expose ourselves to the null files 784 * problem. 785 * 786 * Only flush from the on disk size to the smaller of the in memory 787 * file size or the new size as that's the range we really care about 788 * here and prevents waiting for other data not within the range we 789 * care about here. 790 */ 791 if (oldsize != ip->i_d.di_size && newsize > ip->i_d.di_size) { 792 error = -filemap_write_and_wait_range(VFS_I(ip)->i_mapping, 793 ip->i_d.di_size, newsize); 794 if (error) 795 return error; 796 } 797 798 /* 799 * Wait for all direct I/O to complete. 800 */ 801 inode_dio_wait(inode); 802 803 error = -block_truncate_page(inode->i_mapping, newsize, xfs_get_blocks); 804 if (error) 805 return error; 806 807 tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_SIZE); 808 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_itruncate, 0, 0); 809 if (error) 810 goto out_trans_cancel; 811 812 truncate_setsize(inode, newsize); 813 814 commit_flags = XFS_TRANS_RELEASE_LOG_RES; 815 lock_flags |= XFS_ILOCK_EXCL; 816 817 xfs_ilock(ip, XFS_ILOCK_EXCL); 818 819 xfs_trans_ijoin(tp, ip, 0); 820 821 /* 822 * Only change the c/mtime if we are changing the size or we are 823 * explicitly asked to change it. This handles the semantic difference 824 * between truncate() and ftruncate() as implemented in the VFS. 825 * 826 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a 827 * special case where we need to update the times despite not having 828 * these flags set. For all other operations the VFS set these flags 829 * explicitly if it wants a timestamp update. 830 */ 831 if (newsize != oldsize && (!(mask & (ATTR_CTIME | ATTR_MTIME)))) { 832 iattr->ia_ctime = iattr->ia_mtime = 833 current_fs_time(inode->i_sb); 834 mask |= ATTR_CTIME | ATTR_MTIME; 835 } 836 837 /* 838 * The first thing we do is set the size to new_size permanently on 839 * disk. This way we don't have to worry about anyone ever being able 840 * to look at the data being freed even in the face of a crash. 841 * What we're getting around here is the case where we free a block, it 842 * is allocated to another file, it is written to, and then we crash. 843 * If the new data gets written to the file but the log buffers 844 * containing the free and reallocation don't, then we'd end up with 845 * garbage in the blocks being freed. As long as we make the new size 846 * permanent before actually freeing any blocks it doesn't matter if 847 * they get written to. 848 */ 849 ip->i_d.di_size = newsize; 850 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); 851 852 if (newsize <= oldsize) { 853 error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, newsize); 854 if (error) 855 goto out_trans_abort; 856 857 /* 858 * Truncated "down", so we're removing references to old data 859 * here - if we delay flushing for a long time, we expose 860 * ourselves unduly to the notorious NULL files problem. So, 861 * we mark this inode and flush it when the file is closed, 862 * and do not wait the usual (long) time for writeout. 863 */ 864 xfs_iflags_set(ip, XFS_ITRUNCATED); 865 866 /* A truncate down always removes post-EOF blocks. */ 867 xfs_inode_clear_eofblocks_tag(ip); 868 } 869 870 /* 871 * Change file access modes. 872 */ 873 if (mask & ATTR_MODE) 874 xfs_setattr_mode(tp, ip, iattr); 875 876 if (mask & ATTR_CTIME) { 877 inode->i_ctime = iattr->ia_ctime; 878 ip->i_d.di_ctime.t_sec = iattr->ia_ctime.tv_sec; 879 ip->i_d.di_ctime.t_nsec = iattr->ia_ctime.tv_nsec; 880 } 881 if (mask & ATTR_MTIME) { 882 inode->i_mtime = iattr->ia_mtime; 883 ip->i_d.di_mtime.t_sec = iattr->ia_mtime.tv_sec; 884 ip->i_d.di_mtime.t_nsec = iattr->ia_mtime.tv_nsec; 885 } 886 887 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); 888 889 XFS_STATS_INC(xs_ig_attrchg); 890 891 if (mp->m_flags & XFS_MOUNT_WSYNC) 892 xfs_trans_set_sync(tp); 893 894 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); 895 out_unlock: 896 if (lock_flags) 897 xfs_iunlock(ip, lock_flags); 898 return error; 899 900 out_trans_abort: 901 commit_flags |= XFS_TRANS_ABORT; 902 out_trans_cancel: 903 xfs_trans_cancel(tp, commit_flags); 904 goto out_unlock; 905 } 906 907 STATIC int 908 xfs_vn_setattr( 909 struct dentry *dentry, 910 struct iattr *iattr) 911 { 912 struct xfs_inode *ip = XFS_I(dentry->d_inode); 913 int error; 914 915 if (iattr->ia_valid & ATTR_SIZE) { 916 xfs_ilock(ip, XFS_IOLOCK_EXCL); 917 error = xfs_setattr_size(ip, iattr); 918 xfs_iunlock(ip, XFS_IOLOCK_EXCL); 919 } else { 920 error = xfs_setattr_nonsize(ip, iattr, 0); 921 } 922 923 return -error; 924 } 925 926 STATIC int 927 xfs_vn_update_time( 928 struct inode *inode, 929 struct timespec *now, 930 int flags) 931 { 932 struct xfs_inode *ip = XFS_I(inode); 933 struct xfs_mount *mp = ip->i_mount; 934 struct xfs_trans *tp; 935 int error; 936 937 trace_xfs_update_time(ip); 938 939 tp = xfs_trans_alloc(mp, XFS_TRANS_FSYNC_TS); 940 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_fsyncts, 0, 0); 941 if (error) { 942 xfs_trans_cancel(tp, 0); 943 return -error; 944 } 945 946 xfs_ilock(ip, XFS_ILOCK_EXCL); 947 if (flags & S_CTIME) { 948 inode->i_ctime = *now; 949 ip->i_d.di_ctime.t_sec = (__int32_t)now->tv_sec; 950 ip->i_d.di_ctime.t_nsec = (__int32_t)now->tv_nsec; 951 } 952 if (flags & S_MTIME) { 953 inode->i_mtime = *now; 954 ip->i_d.di_mtime.t_sec = (__int32_t)now->tv_sec; 955 ip->i_d.di_mtime.t_nsec = (__int32_t)now->tv_nsec; 956 } 957 if (flags & S_ATIME) { 958 inode->i_atime = *now; 959 ip->i_d.di_atime.t_sec = (__int32_t)now->tv_sec; 960 ip->i_d.di_atime.t_nsec = (__int32_t)now->tv_nsec; 961 } 962 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); 963 xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP); 964 return -xfs_trans_commit(tp, 0); 965 } 966 967 #define XFS_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC|FIEMAP_FLAG_XATTR) 968 969 /* 970 * Call fiemap helper to fill in user data. 971 * Returns positive errors to xfs_getbmap. 972 */ 973 STATIC int 974 xfs_fiemap_format( 975 void **arg, 976 struct getbmapx *bmv, 977 int *full) 978 { 979 int error; 980 struct fiemap_extent_info *fieinfo = *arg; 981 u32 fiemap_flags = 0; 982 u64 logical, physical, length; 983 984 /* Do nothing for a hole */ 985 if (bmv->bmv_block == -1LL) 986 return 0; 987 988 logical = BBTOB(bmv->bmv_offset); 989 physical = BBTOB(bmv->bmv_block); 990 length = BBTOB(bmv->bmv_length); 991 992 if (bmv->bmv_oflags & BMV_OF_PREALLOC) 993 fiemap_flags |= FIEMAP_EXTENT_UNWRITTEN; 994 else if (bmv->bmv_oflags & BMV_OF_DELALLOC) { 995 fiemap_flags |= (FIEMAP_EXTENT_DELALLOC | 996 FIEMAP_EXTENT_UNKNOWN); 997 physical = 0; /* no block yet */ 998 } 999 if (bmv->bmv_oflags & BMV_OF_LAST) 1000 fiemap_flags |= FIEMAP_EXTENT_LAST; 1001 1002 error = fiemap_fill_next_extent(fieinfo, logical, physical, 1003 length, fiemap_flags); 1004 if (error > 0) { 1005 error = 0; 1006 *full = 1; /* user array now full */ 1007 } 1008 1009 return -error; 1010 } 1011 1012 STATIC int 1013 xfs_vn_fiemap( 1014 struct inode *inode, 1015 struct fiemap_extent_info *fieinfo, 1016 u64 start, 1017 u64 length) 1018 { 1019 xfs_inode_t *ip = XFS_I(inode); 1020 struct getbmapx bm; 1021 int error; 1022 1023 error = fiemap_check_flags(fieinfo, XFS_FIEMAP_FLAGS); 1024 if (error) 1025 return error; 1026 1027 /* Set up bmap header for xfs internal routine */ 1028 bm.bmv_offset = BTOBB(start); 1029 /* Special case for whole file */ 1030 if (length == FIEMAP_MAX_OFFSET) 1031 bm.bmv_length = -1LL; 1032 else 1033 bm.bmv_length = BTOBB(length); 1034 1035 /* We add one because in getbmap world count includes the header */ 1036 bm.bmv_count = !fieinfo->fi_extents_max ? MAXEXTNUM : 1037 fieinfo->fi_extents_max + 1; 1038 bm.bmv_count = min_t(__s32, bm.bmv_count, 1039 (PAGE_SIZE * 16 / sizeof(struct getbmapx))); 1040 bm.bmv_iflags = BMV_IF_PREALLOC | BMV_IF_NO_HOLES; 1041 if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) 1042 bm.bmv_iflags |= BMV_IF_ATTRFORK; 1043 if (!(fieinfo->fi_flags & FIEMAP_FLAG_SYNC)) 1044 bm.bmv_iflags |= BMV_IF_DELALLOC; 1045 1046 error = xfs_getbmap(ip, &bm, xfs_fiemap_format, fieinfo); 1047 if (error) 1048 return -error; 1049 1050 return 0; 1051 } 1052 1053 static const struct inode_operations xfs_inode_operations = { 1054 .get_acl = xfs_get_acl, 1055 .getattr = xfs_vn_getattr, 1056 .setattr = xfs_vn_setattr, 1057 .setxattr = generic_setxattr, 1058 .getxattr = generic_getxattr, 1059 .removexattr = generic_removexattr, 1060 .listxattr = xfs_vn_listxattr, 1061 .fiemap = xfs_vn_fiemap, 1062 .update_time = xfs_vn_update_time, 1063 }; 1064 1065 static const struct inode_operations xfs_dir_inode_operations = { 1066 .create = xfs_vn_create, 1067 .lookup = xfs_vn_lookup, 1068 .link = xfs_vn_link, 1069 .unlink = xfs_vn_unlink, 1070 .symlink = xfs_vn_symlink, 1071 .mkdir = xfs_vn_mkdir, 1072 /* 1073 * Yes, XFS uses the same method for rmdir and unlink. 1074 * 1075 * There are some subtile differences deeper in the code, 1076 * but we use S_ISDIR to check for those. 1077 */ 1078 .rmdir = xfs_vn_unlink, 1079 .mknod = xfs_vn_mknod, 1080 .rename = xfs_vn_rename, 1081 .get_acl = xfs_get_acl, 1082 .getattr = xfs_vn_getattr, 1083 .setattr = xfs_vn_setattr, 1084 .setxattr = generic_setxattr, 1085 .getxattr = generic_getxattr, 1086 .removexattr = generic_removexattr, 1087 .listxattr = xfs_vn_listxattr, 1088 .update_time = xfs_vn_update_time, 1089 }; 1090 1091 static const struct inode_operations xfs_dir_ci_inode_operations = { 1092 .create = xfs_vn_create, 1093 .lookup = xfs_vn_ci_lookup, 1094 .link = xfs_vn_link, 1095 .unlink = xfs_vn_unlink, 1096 .symlink = xfs_vn_symlink, 1097 .mkdir = xfs_vn_mkdir, 1098 /* 1099 * Yes, XFS uses the same method for rmdir and unlink. 1100 * 1101 * There are some subtile differences deeper in the code, 1102 * but we use S_ISDIR to check for those. 1103 */ 1104 .rmdir = xfs_vn_unlink, 1105 .mknod = xfs_vn_mknod, 1106 .rename = xfs_vn_rename, 1107 .get_acl = xfs_get_acl, 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 const struct inode_operations xfs_symlink_inode_operations = { 1118 .readlink = generic_readlink, 1119 .follow_link = xfs_vn_follow_link, 1120 .put_link = xfs_vn_put_link, 1121 .get_acl = xfs_get_acl, 1122 .getattr = xfs_vn_getattr, 1123 .setattr = xfs_vn_setattr, 1124 .setxattr = generic_setxattr, 1125 .getxattr = generic_getxattr, 1126 .removexattr = generic_removexattr, 1127 .listxattr = xfs_vn_listxattr, 1128 .update_time = xfs_vn_update_time, 1129 }; 1130 1131 STATIC void 1132 xfs_diflags_to_iflags( 1133 struct inode *inode, 1134 struct xfs_inode *ip) 1135 { 1136 if (ip->i_d.di_flags & XFS_DIFLAG_IMMUTABLE) 1137 inode->i_flags |= S_IMMUTABLE; 1138 else 1139 inode->i_flags &= ~S_IMMUTABLE; 1140 if (ip->i_d.di_flags & XFS_DIFLAG_APPEND) 1141 inode->i_flags |= S_APPEND; 1142 else 1143 inode->i_flags &= ~S_APPEND; 1144 if (ip->i_d.di_flags & XFS_DIFLAG_SYNC) 1145 inode->i_flags |= S_SYNC; 1146 else 1147 inode->i_flags &= ~S_SYNC; 1148 if (ip->i_d.di_flags & XFS_DIFLAG_NOATIME) 1149 inode->i_flags |= S_NOATIME; 1150 else 1151 inode->i_flags &= ~S_NOATIME; 1152 } 1153 1154 /* 1155 * Initialize the Linux inode, set up the operation vectors and 1156 * unlock the inode. 1157 * 1158 * When reading existing inodes from disk this is called directly 1159 * from xfs_iget, when creating a new inode it is called from 1160 * xfs_ialloc after setting up the inode. 1161 * 1162 * We are always called with an uninitialised linux inode here. 1163 * We need to initialise the necessary fields and take a reference 1164 * on it. 1165 */ 1166 void 1167 xfs_setup_inode( 1168 struct xfs_inode *ip) 1169 { 1170 struct inode *inode = &ip->i_vnode; 1171 gfp_t gfp_mask; 1172 1173 inode->i_ino = ip->i_ino; 1174 inode->i_state = I_NEW; 1175 1176 inode_sb_list_add(inode); 1177 /* make the inode look hashed for the writeback code */ 1178 hlist_add_fake(&inode->i_hash); 1179 1180 inode->i_mode = ip->i_d.di_mode; 1181 set_nlink(inode, ip->i_d.di_nlink); 1182 inode->i_uid = xfs_uid_to_kuid(ip->i_d.di_uid); 1183 inode->i_gid = xfs_gid_to_kgid(ip->i_d.di_gid); 1184 1185 switch (inode->i_mode & S_IFMT) { 1186 case S_IFBLK: 1187 case S_IFCHR: 1188 inode->i_rdev = 1189 MKDEV(sysv_major(ip->i_df.if_u2.if_rdev) & 0x1ff, 1190 sysv_minor(ip->i_df.if_u2.if_rdev)); 1191 break; 1192 default: 1193 inode->i_rdev = 0; 1194 break; 1195 } 1196 1197 inode->i_generation = ip->i_d.di_gen; 1198 i_size_write(inode, ip->i_d.di_size); 1199 inode->i_atime.tv_sec = ip->i_d.di_atime.t_sec; 1200 inode->i_atime.tv_nsec = ip->i_d.di_atime.t_nsec; 1201 inode->i_mtime.tv_sec = ip->i_d.di_mtime.t_sec; 1202 inode->i_mtime.tv_nsec = ip->i_d.di_mtime.t_nsec; 1203 inode->i_ctime.tv_sec = ip->i_d.di_ctime.t_sec; 1204 inode->i_ctime.tv_nsec = ip->i_d.di_ctime.t_nsec; 1205 xfs_diflags_to_iflags(inode, ip); 1206 1207 ip->d_ops = ip->i_mount->m_nondir_inode_ops; 1208 switch (inode->i_mode & S_IFMT) { 1209 case S_IFREG: 1210 inode->i_op = &xfs_inode_operations; 1211 inode->i_fop = &xfs_file_operations; 1212 inode->i_mapping->a_ops = &xfs_address_space_operations; 1213 break; 1214 case S_IFDIR: 1215 if (xfs_sb_version_hasasciici(&XFS_M(inode->i_sb)->m_sb)) 1216 inode->i_op = &xfs_dir_ci_inode_operations; 1217 else 1218 inode->i_op = &xfs_dir_inode_operations; 1219 inode->i_fop = &xfs_dir_file_operations; 1220 ip->d_ops = ip->i_mount->m_dir_inode_ops; 1221 break; 1222 case S_IFLNK: 1223 inode->i_op = &xfs_symlink_inode_operations; 1224 if (!(ip->i_df.if_flags & XFS_IFINLINE)) 1225 inode->i_mapping->a_ops = &xfs_address_space_operations; 1226 break; 1227 default: 1228 inode->i_op = &xfs_inode_operations; 1229 init_special_inode(inode, inode->i_mode, inode->i_rdev); 1230 break; 1231 } 1232 1233 /* 1234 * Ensure all page cache allocations are done from GFP_NOFS context to 1235 * prevent direct reclaim recursion back into the filesystem and blowing 1236 * stacks or deadlocking. 1237 */ 1238 gfp_mask = mapping_gfp_mask(inode->i_mapping); 1239 mapping_set_gfp_mask(inode->i_mapping, (gfp_mask & ~(__GFP_FS))); 1240 1241 /* 1242 * If there is no attribute fork no ACL can exist on this inode, 1243 * and it can't have any file capabilities attached to it either. 1244 */ 1245 if (!XFS_IFORK_Q(ip)) { 1246 inode_has_no_xattr(inode); 1247 cache_no_acl(inode); 1248 } 1249 1250 xfs_iflags_clear(ip, XFS_INEW); 1251 barrier(); 1252 1253 unlock_new_inode(inode); 1254 } 1255