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