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_mount.h" 25 #include "xfs_da_format.h" 26 #include "xfs_inode.h" 27 #include "xfs_bmap.h" 28 #include "xfs_bmap_util.h" 29 #include "xfs_acl.h" 30 #include "xfs_quota.h" 31 #include "xfs_error.h" 32 #include "xfs_attr.h" 33 #include "xfs_trans.h" 34 #include "xfs_trace.h" 35 #include "xfs_icache.h" 36 #include "xfs_symlink.h" 37 #include "xfs_da_btree.h" 38 #include "xfs_dir2.h" 39 #include "xfs_trans_space.h" 40 #include "xfs_pnfs.h" 41 #include "xfs_iomap.h" 42 43 #include <linux/capability.h> 44 #include <linux/xattr.h> 45 #include <linux/posix_acl.h> 46 #include <linux/security.h> 47 #include <linux/iomap.h> 48 #include <linux/slab.h> 49 50 /* 51 * Directories have different lock order w.r.t. mmap_sem compared to regular 52 * files. This is due to readdir potentially triggering page faults on a user 53 * buffer inside filldir(), and this happens with the ilock on the directory 54 * held. For regular files, the lock order is the other way around - the 55 * mmap_sem is taken during the page fault, and then we lock the ilock to do 56 * block mapping. Hence we need a different class for the directory ilock so 57 * that lockdep can tell them apart. 58 */ 59 static struct lock_class_key xfs_nondir_ilock_class; 60 static struct lock_class_key xfs_dir_ilock_class; 61 62 static int 63 xfs_initxattrs( 64 struct inode *inode, 65 const struct xattr *xattr_array, 66 void *fs_info) 67 { 68 const struct xattr *xattr; 69 struct xfs_inode *ip = XFS_I(inode); 70 int error = 0; 71 72 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 73 error = xfs_attr_set(ip, xattr->name, xattr->value, 74 xattr->value_len, ATTR_SECURE); 75 if (error < 0) 76 break; 77 } 78 return error; 79 } 80 81 /* 82 * Hook in SELinux. This is not quite correct yet, what we really need 83 * here (as we do for default ACLs) is a mechanism by which creation of 84 * these attrs can be journalled at inode creation time (along with the 85 * inode, of course, such that log replay can't cause these to be lost). 86 */ 87 88 STATIC int 89 xfs_init_security( 90 struct inode *inode, 91 struct inode *dir, 92 const struct qstr *qstr) 93 { 94 return security_inode_init_security(inode, dir, qstr, 95 &xfs_initxattrs, NULL); 96 } 97 98 static void 99 xfs_dentry_to_name( 100 struct xfs_name *namep, 101 struct dentry *dentry) 102 { 103 namep->name = dentry->d_name.name; 104 namep->len = dentry->d_name.len; 105 namep->type = XFS_DIR3_FT_UNKNOWN; 106 } 107 108 static int 109 xfs_dentry_mode_to_name( 110 struct xfs_name *namep, 111 struct dentry *dentry, 112 int mode) 113 { 114 namep->name = dentry->d_name.name; 115 namep->len = dentry->d_name.len; 116 namep->type = xfs_mode_to_ftype(mode); 117 118 if (unlikely(namep->type == XFS_DIR3_FT_UNKNOWN)) 119 return -EFSCORRUPTED; 120 121 return 0; 122 } 123 124 STATIC void 125 xfs_cleanup_inode( 126 struct inode *dir, 127 struct inode *inode, 128 struct dentry *dentry) 129 { 130 struct xfs_name teardown; 131 132 /* Oh, the horror. 133 * If we can't add the ACL or we fail in 134 * xfs_init_security we must back out. 135 * ENOSPC can hit here, among other things. 136 */ 137 xfs_dentry_to_name(&teardown, dentry); 138 139 xfs_remove(XFS_I(dir), &teardown, XFS_I(inode)); 140 } 141 142 STATIC int 143 xfs_generic_create( 144 struct inode *dir, 145 struct dentry *dentry, 146 umode_t mode, 147 dev_t rdev, 148 bool tmpfile) /* unnamed file */ 149 { 150 struct inode *inode; 151 struct xfs_inode *ip = NULL; 152 struct posix_acl *default_acl, *acl; 153 struct xfs_name name; 154 int error; 155 156 /* 157 * Irix uses Missed'em'V split, but doesn't want to see 158 * the upper 5 bits of (14bit) major. 159 */ 160 if (S_ISCHR(mode) || S_ISBLK(mode)) { 161 if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff)) 162 return -EINVAL; 163 rdev = sysv_encode_dev(rdev); 164 } else { 165 rdev = 0; 166 } 167 168 error = posix_acl_create(dir, &mode, &default_acl, &acl); 169 if (error) 170 return error; 171 172 /* Verify mode is valid also for tmpfile case */ 173 error = xfs_dentry_mode_to_name(&name, dentry, mode); 174 if (unlikely(error)) 175 goto out_free_acl; 176 177 if (!tmpfile) { 178 error = xfs_create(XFS_I(dir), &name, mode, rdev, &ip); 179 } else { 180 error = xfs_create_tmpfile(XFS_I(dir), dentry, mode, &ip); 181 } 182 if (unlikely(error)) 183 goto out_free_acl; 184 185 inode = VFS_I(ip); 186 187 error = xfs_init_security(inode, dir, &dentry->d_name); 188 if (unlikely(error)) 189 goto out_cleanup_inode; 190 191 #ifdef CONFIG_XFS_POSIX_ACL 192 if (default_acl) { 193 error = xfs_set_acl(inode, default_acl, ACL_TYPE_DEFAULT); 194 if (error) 195 goto out_cleanup_inode; 196 } 197 if (acl) { 198 error = xfs_set_acl(inode, acl, ACL_TYPE_ACCESS); 199 if (error) 200 goto out_cleanup_inode; 201 } 202 #endif 203 204 xfs_setup_iops(ip); 205 206 if (tmpfile) 207 d_tmpfile(dentry, inode); 208 else 209 d_instantiate(dentry, inode); 210 211 xfs_finish_inode_setup(ip); 212 213 out_free_acl: 214 if (default_acl) 215 posix_acl_release(default_acl); 216 if (acl) 217 posix_acl_release(acl); 218 return error; 219 220 out_cleanup_inode: 221 xfs_finish_inode_setup(ip); 222 if (!tmpfile) 223 xfs_cleanup_inode(dir, inode, dentry); 224 iput(inode); 225 goto out_free_acl; 226 } 227 228 STATIC int 229 xfs_vn_mknod( 230 struct inode *dir, 231 struct dentry *dentry, 232 umode_t mode, 233 dev_t rdev) 234 { 235 return xfs_generic_create(dir, dentry, mode, rdev, false); 236 } 237 238 STATIC int 239 xfs_vn_create( 240 struct inode *dir, 241 struct dentry *dentry, 242 umode_t mode, 243 bool flags) 244 { 245 return xfs_vn_mknod(dir, dentry, mode, 0); 246 } 247 248 STATIC int 249 xfs_vn_mkdir( 250 struct inode *dir, 251 struct dentry *dentry, 252 umode_t mode) 253 { 254 return xfs_vn_mknod(dir, dentry, mode|S_IFDIR, 0); 255 } 256 257 STATIC struct dentry * 258 xfs_vn_lookup( 259 struct inode *dir, 260 struct dentry *dentry, 261 unsigned int flags) 262 { 263 struct xfs_inode *cip; 264 struct xfs_name name; 265 int error; 266 267 if (dentry->d_name.len >= MAXNAMELEN) 268 return ERR_PTR(-ENAMETOOLONG); 269 270 xfs_dentry_to_name(&name, dentry); 271 error = xfs_lookup(XFS_I(dir), &name, &cip, NULL); 272 if (unlikely(error)) { 273 if (unlikely(error != -ENOENT)) 274 return ERR_PTR(error); 275 d_add(dentry, NULL); 276 return NULL; 277 } 278 279 return d_splice_alias(VFS_I(cip), dentry); 280 } 281 282 STATIC struct dentry * 283 xfs_vn_ci_lookup( 284 struct inode *dir, 285 struct dentry *dentry, 286 unsigned int flags) 287 { 288 struct xfs_inode *ip; 289 struct xfs_name xname; 290 struct xfs_name ci_name; 291 struct qstr dname; 292 int error; 293 294 if (dentry->d_name.len >= MAXNAMELEN) 295 return ERR_PTR(-ENAMETOOLONG); 296 297 xfs_dentry_to_name(&xname, dentry); 298 error = xfs_lookup(XFS_I(dir), &xname, &ip, &ci_name); 299 if (unlikely(error)) { 300 if (unlikely(error != -ENOENT)) 301 return ERR_PTR(error); 302 /* 303 * call d_add(dentry, NULL) here when d_drop_negative_children 304 * is called in xfs_vn_mknod (ie. allow negative dentries 305 * with CI filesystems). 306 */ 307 return NULL; 308 } 309 310 /* if exact match, just splice and exit */ 311 if (!ci_name.name) 312 return d_splice_alias(VFS_I(ip), dentry); 313 314 /* else case-insensitive match... */ 315 dname.name = ci_name.name; 316 dname.len = ci_name.len; 317 dentry = d_add_ci(dentry, VFS_I(ip), &dname); 318 kmem_free(ci_name.name); 319 return dentry; 320 } 321 322 STATIC int 323 xfs_vn_link( 324 struct dentry *old_dentry, 325 struct inode *dir, 326 struct dentry *dentry) 327 { 328 struct inode *inode = d_inode(old_dentry); 329 struct xfs_name name; 330 int error; 331 332 error = xfs_dentry_mode_to_name(&name, dentry, inode->i_mode); 333 if (unlikely(error)) 334 return error; 335 336 error = xfs_link(XFS_I(dir), XFS_I(inode), &name); 337 if (unlikely(error)) 338 return error; 339 340 ihold(inode); 341 d_instantiate(dentry, inode); 342 return 0; 343 } 344 345 STATIC int 346 xfs_vn_unlink( 347 struct inode *dir, 348 struct dentry *dentry) 349 { 350 struct xfs_name name; 351 int error; 352 353 xfs_dentry_to_name(&name, dentry); 354 355 error = xfs_remove(XFS_I(dir), &name, XFS_I(d_inode(dentry))); 356 if (error) 357 return error; 358 359 /* 360 * With unlink, the VFS makes the dentry "negative": no inode, 361 * but still hashed. This is incompatible with case-insensitive 362 * mode, so invalidate (unhash) the dentry in CI-mode. 363 */ 364 if (xfs_sb_version_hasasciici(&XFS_M(dir->i_sb)->m_sb)) 365 d_invalidate(dentry); 366 return 0; 367 } 368 369 STATIC int 370 xfs_vn_symlink( 371 struct inode *dir, 372 struct dentry *dentry, 373 const char *symname) 374 { 375 struct inode *inode; 376 struct xfs_inode *cip = NULL; 377 struct xfs_name name; 378 int error; 379 umode_t mode; 380 381 mode = S_IFLNK | 382 (irix_symlink_mode ? 0777 & ~current_umask() : S_IRWXUGO); 383 error = xfs_dentry_mode_to_name(&name, dentry, mode); 384 if (unlikely(error)) 385 goto out; 386 387 error = xfs_symlink(XFS_I(dir), &name, symname, mode, &cip); 388 if (unlikely(error)) 389 goto out; 390 391 inode = VFS_I(cip); 392 393 error = xfs_init_security(inode, dir, &dentry->d_name); 394 if (unlikely(error)) 395 goto out_cleanup_inode; 396 397 xfs_setup_iops(cip); 398 399 d_instantiate(dentry, inode); 400 xfs_finish_inode_setup(cip); 401 return 0; 402 403 out_cleanup_inode: 404 xfs_finish_inode_setup(cip); 405 xfs_cleanup_inode(dir, inode, dentry); 406 iput(inode); 407 out: 408 return error; 409 } 410 411 STATIC int 412 xfs_vn_rename( 413 struct inode *odir, 414 struct dentry *odentry, 415 struct inode *ndir, 416 struct dentry *ndentry, 417 unsigned int flags) 418 { 419 struct inode *new_inode = d_inode(ndentry); 420 int omode = 0; 421 int error; 422 struct xfs_name oname; 423 struct xfs_name nname; 424 425 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT)) 426 return -EINVAL; 427 428 /* if we are exchanging files, we need to set i_mode of both files */ 429 if (flags & RENAME_EXCHANGE) 430 omode = d_inode(ndentry)->i_mode; 431 432 error = xfs_dentry_mode_to_name(&oname, odentry, omode); 433 if (omode && unlikely(error)) 434 return error; 435 436 error = xfs_dentry_mode_to_name(&nname, ndentry, 437 d_inode(odentry)->i_mode); 438 if (unlikely(error)) 439 return error; 440 441 return xfs_rename(XFS_I(odir), &oname, XFS_I(d_inode(odentry)), 442 XFS_I(ndir), &nname, 443 new_inode ? XFS_I(new_inode) : NULL, flags); 444 } 445 446 /* 447 * careful here - this function can get called recursively, so 448 * we need to be very careful about how much stack we use. 449 * uio is kmalloced for this reason... 450 */ 451 STATIC const char * 452 xfs_vn_get_link( 453 struct dentry *dentry, 454 struct inode *inode, 455 struct delayed_call *done) 456 { 457 char *link; 458 int error = -ENOMEM; 459 460 if (!dentry) 461 return ERR_PTR(-ECHILD); 462 463 link = kmalloc(MAXPATHLEN+1, GFP_KERNEL); 464 if (!link) 465 goto out_err; 466 467 error = xfs_readlink(XFS_I(d_inode(dentry)), link); 468 if (unlikely(error)) 469 goto out_kfree; 470 471 set_delayed_call(done, kfree_link, link); 472 return link; 473 474 out_kfree: 475 kfree(link); 476 out_err: 477 return ERR_PTR(error); 478 } 479 480 STATIC const char * 481 xfs_vn_get_link_inline( 482 struct dentry *dentry, 483 struct inode *inode, 484 struct delayed_call *done) 485 { 486 ASSERT(XFS_I(inode)->i_df.if_flags & XFS_IFINLINE); 487 return XFS_I(inode)->i_df.if_u1.if_data; 488 } 489 490 STATIC int 491 xfs_vn_getattr( 492 struct vfsmount *mnt, 493 struct dentry *dentry, 494 struct kstat *stat) 495 { 496 struct inode *inode = d_inode(dentry); 497 struct xfs_inode *ip = XFS_I(inode); 498 struct xfs_mount *mp = ip->i_mount; 499 500 trace_xfs_getattr(ip); 501 502 if (XFS_FORCED_SHUTDOWN(mp)) 503 return -EIO; 504 505 stat->size = XFS_ISIZE(ip); 506 stat->dev = inode->i_sb->s_dev; 507 stat->mode = inode->i_mode; 508 stat->nlink = inode->i_nlink; 509 stat->uid = inode->i_uid; 510 stat->gid = inode->i_gid; 511 stat->ino = ip->i_ino; 512 stat->atime = inode->i_atime; 513 stat->mtime = inode->i_mtime; 514 stat->ctime = inode->i_ctime; 515 stat->blocks = 516 XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks); 517 518 519 switch (inode->i_mode & S_IFMT) { 520 case S_IFBLK: 521 case S_IFCHR: 522 stat->blksize = BLKDEV_IOSIZE; 523 stat->rdev = MKDEV(sysv_major(ip->i_df.if_u2.if_rdev) & 0x1ff, 524 sysv_minor(ip->i_df.if_u2.if_rdev)); 525 break; 526 default: 527 if (XFS_IS_REALTIME_INODE(ip)) { 528 /* 529 * If the file blocks are being allocated from a 530 * realtime volume, then return the inode's realtime 531 * extent size or the realtime volume's extent size. 532 */ 533 stat->blksize = 534 xfs_get_extsz_hint(ip) << mp->m_sb.sb_blocklog; 535 } else 536 stat->blksize = xfs_preferred_iosize(mp); 537 stat->rdev = 0; 538 break; 539 } 540 541 return 0; 542 } 543 544 static void 545 xfs_setattr_mode( 546 struct xfs_inode *ip, 547 struct iattr *iattr) 548 { 549 struct inode *inode = VFS_I(ip); 550 umode_t mode = iattr->ia_mode; 551 552 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); 553 554 inode->i_mode &= S_IFMT; 555 inode->i_mode |= mode & ~S_IFMT; 556 } 557 558 void 559 xfs_setattr_time( 560 struct xfs_inode *ip, 561 struct iattr *iattr) 562 { 563 struct inode *inode = VFS_I(ip); 564 565 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); 566 567 if (iattr->ia_valid & ATTR_ATIME) 568 inode->i_atime = iattr->ia_atime; 569 if (iattr->ia_valid & ATTR_CTIME) 570 inode->i_ctime = iattr->ia_ctime; 571 if (iattr->ia_valid & ATTR_MTIME) 572 inode->i_mtime = iattr->ia_mtime; 573 } 574 575 static int 576 xfs_vn_change_ok( 577 struct dentry *dentry, 578 struct iattr *iattr) 579 { 580 struct xfs_mount *mp = XFS_I(d_inode(dentry))->i_mount; 581 582 if (mp->m_flags & XFS_MOUNT_RDONLY) 583 return -EROFS; 584 585 if (XFS_FORCED_SHUTDOWN(mp)) 586 return -EIO; 587 588 return setattr_prepare(dentry, iattr); 589 } 590 591 /* 592 * Set non-size attributes of an inode. 593 * 594 * Caution: The caller of this function is responsible for calling 595 * setattr_prepare() or otherwise verifying the change is fine. 596 */ 597 int 598 xfs_setattr_nonsize( 599 struct xfs_inode *ip, 600 struct iattr *iattr, 601 int flags) 602 { 603 xfs_mount_t *mp = ip->i_mount; 604 struct inode *inode = VFS_I(ip); 605 int mask = iattr->ia_valid; 606 xfs_trans_t *tp; 607 int error; 608 kuid_t uid = GLOBAL_ROOT_UID, iuid = GLOBAL_ROOT_UID; 609 kgid_t gid = GLOBAL_ROOT_GID, igid = GLOBAL_ROOT_GID; 610 struct xfs_dquot *udqp = NULL, *gdqp = NULL; 611 struct xfs_dquot *olddquot1 = NULL, *olddquot2 = NULL; 612 613 ASSERT((mask & ATTR_SIZE) == 0); 614 615 /* 616 * If disk quotas is on, we make sure that the dquots do exist on disk, 617 * before we start any other transactions. Trying to do this later 618 * is messy. We don't care to take a readlock to look at the ids 619 * in inode here, because we can't hold it across the trans_reserve. 620 * If the IDs do change before we take the ilock, we're covered 621 * because the i_*dquot fields will get updated anyway. 622 */ 623 if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) { 624 uint qflags = 0; 625 626 if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) { 627 uid = iattr->ia_uid; 628 qflags |= XFS_QMOPT_UQUOTA; 629 } else { 630 uid = inode->i_uid; 631 } 632 if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) { 633 gid = iattr->ia_gid; 634 qflags |= XFS_QMOPT_GQUOTA; 635 } else { 636 gid = inode->i_gid; 637 } 638 639 /* 640 * We take a reference when we initialize udqp and gdqp, 641 * so it is important that we never blindly double trip on 642 * the same variable. See xfs_create() for an example. 643 */ 644 ASSERT(udqp == NULL); 645 ASSERT(gdqp == NULL); 646 error = xfs_qm_vop_dqalloc(ip, xfs_kuid_to_uid(uid), 647 xfs_kgid_to_gid(gid), 648 xfs_get_projid(ip), 649 qflags, &udqp, &gdqp, NULL); 650 if (error) 651 return error; 652 } 653 654 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp); 655 if (error) 656 goto out_dqrele; 657 658 xfs_ilock(ip, XFS_ILOCK_EXCL); 659 xfs_trans_ijoin(tp, ip, 0); 660 661 /* 662 * Change file ownership. Must be the owner or privileged. 663 */ 664 if (mask & (ATTR_UID|ATTR_GID)) { 665 /* 666 * These IDs could have changed since we last looked at them. 667 * But, we're assured that if the ownership did change 668 * while we didn't have the inode locked, inode's dquot(s) 669 * would have changed also. 670 */ 671 iuid = inode->i_uid; 672 igid = inode->i_gid; 673 gid = (mask & ATTR_GID) ? iattr->ia_gid : igid; 674 uid = (mask & ATTR_UID) ? iattr->ia_uid : iuid; 675 676 /* 677 * Do a quota reservation only if uid/gid is actually 678 * going to change. 679 */ 680 if (XFS_IS_QUOTA_RUNNING(mp) && 681 ((XFS_IS_UQUOTA_ON(mp) && !uid_eq(iuid, uid)) || 682 (XFS_IS_GQUOTA_ON(mp) && !gid_eq(igid, gid)))) { 683 ASSERT(tp); 684 error = xfs_qm_vop_chown_reserve(tp, ip, udqp, gdqp, 685 NULL, capable(CAP_FOWNER) ? 686 XFS_QMOPT_FORCE_RES : 0); 687 if (error) /* out of quota */ 688 goto out_cancel; 689 } 690 } 691 692 /* 693 * Change file ownership. Must be the owner or privileged. 694 */ 695 if (mask & (ATTR_UID|ATTR_GID)) { 696 /* 697 * CAP_FSETID overrides the following restrictions: 698 * 699 * The set-user-ID and set-group-ID bits of a file will be 700 * cleared upon successful return from chown() 701 */ 702 if ((inode->i_mode & (S_ISUID|S_ISGID)) && 703 !capable(CAP_FSETID)) 704 inode->i_mode &= ~(S_ISUID|S_ISGID); 705 706 /* 707 * Change the ownerships and register quota modifications 708 * in the transaction. 709 */ 710 if (!uid_eq(iuid, uid)) { 711 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_UQUOTA_ON(mp)) { 712 ASSERT(mask & ATTR_UID); 713 ASSERT(udqp); 714 olddquot1 = xfs_qm_vop_chown(tp, ip, 715 &ip->i_udquot, udqp); 716 } 717 ip->i_d.di_uid = xfs_kuid_to_uid(uid); 718 inode->i_uid = uid; 719 } 720 if (!gid_eq(igid, gid)) { 721 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_GQUOTA_ON(mp)) { 722 ASSERT(xfs_sb_version_has_pquotino(&mp->m_sb) || 723 !XFS_IS_PQUOTA_ON(mp)); 724 ASSERT(mask & ATTR_GID); 725 ASSERT(gdqp); 726 olddquot2 = xfs_qm_vop_chown(tp, ip, 727 &ip->i_gdquot, gdqp); 728 } 729 ip->i_d.di_gid = xfs_kgid_to_gid(gid); 730 inode->i_gid = gid; 731 } 732 } 733 734 if (mask & ATTR_MODE) 735 xfs_setattr_mode(ip, iattr); 736 if (mask & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME)) 737 xfs_setattr_time(ip, iattr); 738 739 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); 740 741 XFS_STATS_INC(mp, xs_ig_attrchg); 742 743 if (mp->m_flags & XFS_MOUNT_WSYNC) 744 xfs_trans_set_sync(tp); 745 error = xfs_trans_commit(tp); 746 747 xfs_iunlock(ip, XFS_ILOCK_EXCL); 748 749 /* 750 * Release any dquot(s) the inode had kept before chown. 751 */ 752 xfs_qm_dqrele(olddquot1); 753 xfs_qm_dqrele(olddquot2); 754 xfs_qm_dqrele(udqp); 755 xfs_qm_dqrele(gdqp); 756 757 if (error) 758 return error; 759 760 /* 761 * XXX(hch): Updating the ACL entries is not atomic vs the i_mode 762 * update. We could avoid this with linked transactions 763 * and passing down the transaction pointer all the way 764 * to attr_set. No previous user of the generic 765 * Posix ACL code seems to care about this issue either. 766 */ 767 if ((mask & ATTR_MODE) && !(flags & XFS_ATTR_NOACL)) { 768 error = posix_acl_chmod(inode, inode->i_mode); 769 if (error) 770 return error; 771 } 772 773 return 0; 774 775 out_cancel: 776 xfs_trans_cancel(tp); 777 out_dqrele: 778 xfs_qm_dqrele(udqp); 779 xfs_qm_dqrele(gdqp); 780 return error; 781 } 782 783 int 784 xfs_vn_setattr_nonsize( 785 struct dentry *dentry, 786 struct iattr *iattr) 787 { 788 struct xfs_inode *ip = XFS_I(d_inode(dentry)); 789 int error; 790 791 trace_xfs_setattr(ip); 792 793 error = xfs_vn_change_ok(dentry, iattr); 794 if (error) 795 return error; 796 return xfs_setattr_nonsize(ip, iattr, 0); 797 } 798 799 /* 800 * Truncate file. Must have write permission and not be a directory. 801 * 802 * Caution: The caller of this function is responsible for calling 803 * setattr_prepare() or otherwise verifying the change is fine. 804 */ 805 int 806 xfs_setattr_size( 807 struct xfs_inode *ip, 808 struct iattr *iattr) 809 { 810 struct xfs_mount *mp = ip->i_mount; 811 struct inode *inode = VFS_I(ip); 812 xfs_off_t oldsize, newsize; 813 struct xfs_trans *tp; 814 int error; 815 uint lock_flags = 0; 816 bool did_zeroing = false; 817 818 ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL)); 819 ASSERT(xfs_isilocked(ip, XFS_MMAPLOCK_EXCL)); 820 ASSERT(S_ISREG(inode->i_mode)); 821 ASSERT((iattr->ia_valid & (ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET| 822 ATTR_MTIME_SET|ATTR_KILL_PRIV|ATTR_TIMES_SET)) == 0); 823 824 oldsize = inode->i_size; 825 newsize = iattr->ia_size; 826 827 /* 828 * Short circuit the truncate case for zero length files. 829 */ 830 if (newsize == 0 && oldsize == 0 && ip->i_d.di_nextents == 0) { 831 if (!(iattr->ia_valid & (ATTR_CTIME|ATTR_MTIME))) 832 return 0; 833 834 /* 835 * Use the regular setattr path to update the timestamps. 836 */ 837 iattr->ia_valid &= ~ATTR_SIZE; 838 return xfs_setattr_nonsize(ip, iattr, 0); 839 } 840 841 /* 842 * Make sure that the dquots are attached to the inode. 843 */ 844 error = xfs_qm_dqattach(ip, 0); 845 if (error) 846 return error; 847 848 /* 849 * Wait for all direct I/O to complete. 850 */ 851 inode_dio_wait(inode); 852 853 /* 854 * File data changes must be complete before we start the transaction to 855 * modify the inode. This needs to be done before joining the inode to 856 * the transaction because the inode cannot be unlocked once it is a 857 * part of the transaction. 858 * 859 * Start with zeroing any data beyond EOF that we may expose on file 860 * extension, or zeroing out the rest of the block on a downward 861 * truncate. 862 */ 863 if (newsize > oldsize) { 864 error = xfs_zero_eof(ip, newsize, oldsize, &did_zeroing); 865 } else { 866 error = iomap_truncate_page(inode, newsize, &did_zeroing, 867 &xfs_iomap_ops); 868 } 869 870 if (error) 871 return error; 872 873 /* 874 * We are going to log the inode size change in this transaction so 875 * any previous writes that are beyond the on disk EOF and the new 876 * EOF that have not been written out need to be written here. If we 877 * do not write the data out, we expose ourselves to the null files 878 * problem. Note that this includes any block zeroing we did above; 879 * otherwise those blocks may not be zeroed after a crash. 880 */ 881 if (did_zeroing || 882 (newsize > ip->i_d.di_size && oldsize != ip->i_d.di_size)) { 883 error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping, 884 ip->i_d.di_size, newsize); 885 if (error) 886 return error; 887 } 888 889 /* 890 * We've already locked out new page faults, so now we can safely remove 891 * pages from the page cache knowing they won't get refaulted until we 892 * drop the XFS_MMAP_EXCL lock after the extent manipulations are 893 * complete. The truncate_setsize() call also cleans partial EOF page 894 * PTEs on extending truncates and hence ensures sub-page block size 895 * filesystems are correctly handled, too. 896 * 897 * We have to do all the page cache truncate work outside the 898 * transaction context as the "lock" order is page lock->log space 899 * reservation as defined by extent allocation in the writeback path. 900 * Hence a truncate can fail with ENOMEM from xfs_trans_alloc(), but 901 * having already truncated the in-memory version of the file (i.e. made 902 * user visible changes). There's not much we can do about this, except 903 * to hope that the caller sees ENOMEM and retries the truncate 904 * operation. 905 */ 906 truncate_setsize(inode, newsize); 907 908 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp); 909 if (error) 910 return error; 911 912 lock_flags |= XFS_ILOCK_EXCL; 913 xfs_ilock(ip, XFS_ILOCK_EXCL); 914 xfs_trans_ijoin(tp, ip, 0); 915 916 /* 917 * Only change the c/mtime if we are changing the size or we are 918 * explicitly asked to change it. This handles the semantic difference 919 * between truncate() and ftruncate() as implemented in the VFS. 920 * 921 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a 922 * special case where we need to update the times despite not having 923 * these flags set. For all other operations the VFS set these flags 924 * explicitly if it wants a timestamp update. 925 */ 926 if (newsize != oldsize && 927 !(iattr->ia_valid & (ATTR_CTIME | ATTR_MTIME))) { 928 iattr->ia_ctime = iattr->ia_mtime = 929 current_time(inode); 930 iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME; 931 } 932 933 /* 934 * The first thing we do is set the size to new_size permanently on 935 * disk. This way we don't have to worry about anyone ever being able 936 * to look at the data being freed even in the face of a crash. 937 * What we're getting around here is the case where we free a block, it 938 * is allocated to another file, it is written to, and then we crash. 939 * If the new data gets written to the file but the log buffers 940 * containing the free and reallocation don't, then we'd end up with 941 * garbage in the blocks being freed. As long as we make the new size 942 * permanent before actually freeing any blocks it doesn't matter if 943 * they get written to. 944 */ 945 ip->i_d.di_size = newsize; 946 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); 947 948 if (newsize <= oldsize) { 949 error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, newsize); 950 if (error) 951 goto out_trans_cancel; 952 953 /* 954 * Truncated "down", so we're removing references to old data 955 * here - if we delay flushing for a long time, we expose 956 * ourselves unduly to the notorious NULL files problem. So, 957 * we mark this inode and flush it when the file is closed, 958 * and do not wait the usual (long) time for writeout. 959 */ 960 xfs_iflags_set(ip, XFS_ITRUNCATED); 961 962 /* A truncate down always removes post-EOF blocks. */ 963 xfs_inode_clear_eofblocks_tag(ip); 964 } 965 966 if (iattr->ia_valid & ATTR_MODE) 967 xfs_setattr_mode(ip, iattr); 968 if (iattr->ia_valid & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME)) 969 xfs_setattr_time(ip, iattr); 970 971 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); 972 973 XFS_STATS_INC(mp, xs_ig_attrchg); 974 975 if (mp->m_flags & XFS_MOUNT_WSYNC) 976 xfs_trans_set_sync(tp); 977 978 error = xfs_trans_commit(tp); 979 out_unlock: 980 if (lock_flags) 981 xfs_iunlock(ip, lock_flags); 982 return error; 983 984 out_trans_cancel: 985 xfs_trans_cancel(tp); 986 goto out_unlock; 987 } 988 989 int 990 xfs_vn_setattr_size( 991 struct dentry *dentry, 992 struct iattr *iattr) 993 { 994 struct xfs_inode *ip = XFS_I(d_inode(dentry)); 995 int error; 996 997 trace_xfs_setattr(ip); 998 999 error = xfs_vn_change_ok(dentry, iattr); 1000 if (error) 1001 return error; 1002 return xfs_setattr_size(ip, iattr); 1003 } 1004 1005 STATIC int 1006 xfs_vn_setattr( 1007 struct dentry *dentry, 1008 struct iattr *iattr) 1009 { 1010 int error; 1011 1012 if (iattr->ia_valid & ATTR_SIZE) { 1013 struct xfs_inode *ip = XFS_I(d_inode(dentry)); 1014 uint iolock = XFS_IOLOCK_EXCL; 1015 1016 error = xfs_break_layouts(d_inode(dentry), &iolock); 1017 if (error) 1018 return error; 1019 1020 xfs_ilock(ip, XFS_MMAPLOCK_EXCL); 1021 error = xfs_vn_setattr_size(dentry, iattr); 1022 xfs_iunlock(ip, XFS_MMAPLOCK_EXCL); 1023 } else { 1024 error = xfs_vn_setattr_nonsize(dentry, iattr); 1025 } 1026 1027 return error; 1028 } 1029 1030 STATIC int 1031 xfs_vn_update_time( 1032 struct inode *inode, 1033 struct timespec *now, 1034 int flags) 1035 { 1036 struct xfs_inode *ip = XFS_I(inode); 1037 struct xfs_mount *mp = ip->i_mount; 1038 struct xfs_trans *tp; 1039 int error; 1040 1041 trace_xfs_update_time(ip); 1042 1043 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp); 1044 if (error) 1045 return error; 1046 1047 xfs_ilock(ip, XFS_ILOCK_EXCL); 1048 if (flags & S_CTIME) 1049 inode->i_ctime = *now; 1050 if (flags & S_MTIME) 1051 inode->i_mtime = *now; 1052 if (flags & S_ATIME) 1053 inode->i_atime = *now; 1054 1055 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); 1056 xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP); 1057 return xfs_trans_commit(tp); 1058 } 1059 1060 STATIC int 1061 xfs_vn_fiemap( 1062 struct inode *inode, 1063 struct fiemap_extent_info *fieinfo, 1064 u64 start, 1065 u64 length) 1066 { 1067 int error; 1068 1069 xfs_ilock(XFS_I(inode), XFS_IOLOCK_SHARED); 1070 if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) { 1071 fieinfo->fi_flags &= ~FIEMAP_FLAG_XATTR; 1072 error = iomap_fiemap(inode, fieinfo, start, length, 1073 &xfs_xattr_iomap_ops); 1074 } else { 1075 error = iomap_fiemap(inode, fieinfo, start, length, 1076 &xfs_iomap_ops); 1077 } 1078 xfs_iunlock(XFS_I(inode), XFS_IOLOCK_SHARED); 1079 1080 return error; 1081 } 1082 1083 STATIC int 1084 xfs_vn_tmpfile( 1085 struct inode *dir, 1086 struct dentry *dentry, 1087 umode_t mode) 1088 { 1089 return xfs_generic_create(dir, dentry, mode, 0, true); 1090 } 1091 1092 static const struct inode_operations xfs_inode_operations = { 1093 .get_acl = xfs_get_acl, 1094 .set_acl = xfs_set_acl, 1095 .getattr = xfs_vn_getattr, 1096 .setattr = xfs_vn_setattr, 1097 .listxattr = xfs_vn_listxattr, 1098 .fiemap = xfs_vn_fiemap, 1099 .update_time = xfs_vn_update_time, 1100 }; 1101 1102 static const struct inode_operations xfs_dir_inode_operations = { 1103 .create = xfs_vn_create, 1104 .lookup = xfs_vn_lookup, 1105 .link = xfs_vn_link, 1106 .unlink = xfs_vn_unlink, 1107 .symlink = xfs_vn_symlink, 1108 .mkdir = xfs_vn_mkdir, 1109 /* 1110 * Yes, XFS uses the same method for rmdir and unlink. 1111 * 1112 * There are some subtile differences deeper in the code, 1113 * but we use S_ISDIR to check for those. 1114 */ 1115 .rmdir = xfs_vn_unlink, 1116 .mknod = xfs_vn_mknod, 1117 .rename = xfs_vn_rename, 1118 .get_acl = xfs_get_acl, 1119 .set_acl = xfs_set_acl, 1120 .getattr = xfs_vn_getattr, 1121 .setattr = xfs_vn_setattr, 1122 .listxattr = xfs_vn_listxattr, 1123 .update_time = xfs_vn_update_time, 1124 .tmpfile = xfs_vn_tmpfile, 1125 }; 1126 1127 static const struct inode_operations xfs_dir_ci_inode_operations = { 1128 .create = xfs_vn_create, 1129 .lookup = xfs_vn_ci_lookup, 1130 .link = xfs_vn_link, 1131 .unlink = xfs_vn_unlink, 1132 .symlink = xfs_vn_symlink, 1133 .mkdir = xfs_vn_mkdir, 1134 /* 1135 * Yes, XFS uses the same method for rmdir and unlink. 1136 * 1137 * There are some subtile differences deeper in the code, 1138 * but we use S_ISDIR to check for those. 1139 */ 1140 .rmdir = xfs_vn_unlink, 1141 .mknod = xfs_vn_mknod, 1142 .rename = xfs_vn_rename, 1143 .get_acl = xfs_get_acl, 1144 .set_acl = xfs_set_acl, 1145 .getattr = xfs_vn_getattr, 1146 .setattr = xfs_vn_setattr, 1147 .listxattr = xfs_vn_listxattr, 1148 .update_time = xfs_vn_update_time, 1149 .tmpfile = xfs_vn_tmpfile, 1150 }; 1151 1152 static const struct inode_operations xfs_symlink_inode_operations = { 1153 .get_link = xfs_vn_get_link, 1154 .getattr = xfs_vn_getattr, 1155 .setattr = xfs_vn_setattr, 1156 .listxattr = xfs_vn_listxattr, 1157 .update_time = xfs_vn_update_time, 1158 }; 1159 1160 static const struct inode_operations xfs_inline_symlink_inode_operations = { 1161 .get_link = xfs_vn_get_link_inline, 1162 .getattr = xfs_vn_getattr, 1163 .setattr = xfs_vn_setattr, 1164 .listxattr = xfs_vn_listxattr, 1165 .update_time = xfs_vn_update_time, 1166 }; 1167 1168 STATIC void 1169 xfs_diflags_to_iflags( 1170 struct inode *inode, 1171 struct xfs_inode *ip) 1172 { 1173 uint16_t flags = ip->i_d.di_flags; 1174 1175 inode->i_flags &= ~(S_IMMUTABLE | S_APPEND | S_SYNC | 1176 S_NOATIME | S_DAX); 1177 1178 if (flags & XFS_DIFLAG_IMMUTABLE) 1179 inode->i_flags |= S_IMMUTABLE; 1180 if (flags & XFS_DIFLAG_APPEND) 1181 inode->i_flags |= S_APPEND; 1182 if (flags & XFS_DIFLAG_SYNC) 1183 inode->i_flags |= S_SYNC; 1184 if (flags & XFS_DIFLAG_NOATIME) 1185 inode->i_flags |= S_NOATIME; 1186 if (S_ISREG(inode->i_mode) && 1187 ip->i_mount->m_sb.sb_blocksize == PAGE_SIZE && 1188 !xfs_is_reflink_inode(ip) && 1189 (ip->i_mount->m_flags & XFS_MOUNT_DAX || 1190 ip->i_d.di_flags2 & XFS_DIFLAG2_DAX)) 1191 inode->i_flags |= S_DAX; 1192 } 1193 1194 /* 1195 * Initialize the Linux inode. 1196 * 1197 * When reading existing inodes from disk this is called directly from xfs_iget, 1198 * when creating a new inode it is called from xfs_ialloc after setting up the 1199 * inode. These callers have different criteria for clearing XFS_INEW, so leave 1200 * it up to the caller to deal with unlocking the inode appropriately. 1201 */ 1202 void 1203 xfs_setup_inode( 1204 struct xfs_inode *ip) 1205 { 1206 struct inode *inode = &ip->i_vnode; 1207 gfp_t gfp_mask; 1208 1209 inode->i_ino = ip->i_ino; 1210 inode->i_state = I_NEW; 1211 1212 inode_sb_list_add(inode); 1213 /* make the inode look hashed for the writeback code */ 1214 hlist_add_fake(&inode->i_hash); 1215 1216 inode->i_uid = xfs_uid_to_kuid(ip->i_d.di_uid); 1217 inode->i_gid = xfs_gid_to_kgid(ip->i_d.di_gid); 1218 1219 switch (inode->i_mode & S_IFMT) { 1220 case S_IFBLK: 1221 case S_IFCHR: 1222 inode->i_rdev = 1223 MKDEV(sysv_major(ip->i_df.if_u2.if_rdev) & 0x1ff, 1224 sysv_minor(ip->i_df.if_u2.if_rdev)); 1225 break; 1226 default: 1227 inode->i_rdev = 0; 1228 break; 1229 } 1230 1231 i_size_write(inode, ip->i_d.di_size); 1232 xfs_diflags_to_iflags(inode, ip); 1233 1234 if (S_ISDIR(inode->i_mode)) { 1235 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_dir_ilock_class); 1236 ip->d_ops = ip->i_mount->m_dir_inode_ops; 1237 } else { 1238 ip->d_ops = ip->i_mount->m_nondir_inode_ops; 1239 lockdep_set_class(&ip->i_lock.mr_lock, &xfs_nondir_ilock_class); 1240 } 1241 1242 /* 1243 * Ensure all page cache allocations are done from GFP_NOFS context to 1244 * prevent direct reclaim recursion back into the filesystem and blowing 1245 * stacks or deadlocking. 1246 */ 1247 gfp_mask = mapping_gfp_mask(inode->i_mapping); 1248 mapping_set_gfp_mask(inode->i_mapping, (gfp_mask & ~(__GFP_FS))); 1249 1250 /* 1251 * If there is no attribute fork no ACL can exist on this inode, 1252 * and it can't have any file capabilities attached to it either. 1253 */ 1254 if (!XFS_IFORK_Q(ip)) { 1255 inode_has_no_xattr(inode); 1256 cache_no_acl(inode); 1257 } 1258 } 1259 1260 void 1261 xfs_setup_iops( 1262 struct xfs_inode *ip) 1263 { 1264 struct inode *inode = &ip->i_vnode; 1265 1266 switch (inode->i_mode & S_IFMT) { 1267 case S_IFREG: 1268 inode->i_op = &xfs_inode_operations; 1269 inode->i_fop = &xfs_file_operations; 1270 inode->i_mapping->a_ops = &xfs_address_space_operations; 1271 break; 1272 case S_IFDIR: 1273 if (xfs_sb_version_hasasciici(&XFS_M(inode->i_sb)->m_sb)) 1274 inode->i_op = &xfs_dir_ci_inode_operations; 1275 else 1276 inode->i_op = &xfs_dir_inode_operations; 1277 inode->i_fop = &xfs_dir_file_operations; 1278 break; 1279 case S_IFLNK: 1280 if (ip->i_df.if_flags & XFS_IFINLINE) 1281 inode->i_op = &xfs_inline_symlink_inode_operations; 1282 else 1283 inode->i_op = &xfs_symlink_inode_operations; 1284 break; 1285 default: 1286 inode->i_op = &xfs_inode_operations; 1287 init_special_inode(inode, inode->i_mode, inode->i_rdev); 1288 break; 1289 } 1290 } 1291