1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2000-2005 Silicon Graphics, Inc. 4 * All Rights Reserved. 5 */ 6 #include "xfs.h" 7 #include "xfs_fs.h" 8 #include "xfs_shared.h" 9 #include "xfs_format.h" 10 #include "xfs_log_format.h" 11 #include "xfs_trans_resv.h" 12 #include "xfs_mount.h" 13 #include "xfs_inode.h" 14 #include "xfs_rtalloc.h" 15 #include "xfs_iwalk.h" 16 #include "xfs_itable.h" 17 #include "xfs_error.h" 18 #include "xfs_attr.h" 19 #include "xfs_bmap.h" 20 #include "xfs_bmap_util.h" 21 #include "xfs_fsops.h" 22 #include "xfs_discard.h" 23 #include "xfs_quota.h" 24 #include "xfs_export.h" 25 #include "xfs_trace.h" 26 #include "xfs_icache.h" 27 #include "xfs_trans.h" 28 #include "xfs_acl.h" 29 #include "xfs_btree.h" 30 #include <linux/fsmap.h> 31 #include "xfs_fsmap.h" 32 #include "scrub/xfs_scrub.h" 33 #include "xfs_sb.h" 34 #include "xfs_ag.h" 35 #include "xfs_health.h" 36 #include "xfs_reflink.h" 37 #include "xfs_ioctl.h" 38 #include "xfs_da_format.h" 39 #include "xfs_da_btree.h" 40 41 #include <linux/mount.h> 42 #include <linux/namei.h> 43 44 /* 45 * xfs_find_handle maps from userspace xfs_fsop_handlereq structure to 46 * a file or fs handle. 47 * 48 * XFS_IOC_PATH_TO_FSHANDLE 49 * returns fs handle for a mount point or path within that mount point 50 * XFS_IOC_FD_TO_HANDLE 51 * returns full handle for a FD opened in user space 52 * XFS_IOC_PATH_TO_HANDLE 53 * returns full handle for a path 54 */ 55 int 56 xfs_find_handle( 57 unsigned int cmd, 58 xfs_fsop_handlereq_t *hreq) 59 { 60 int hsize; 61 xfs_handle_t handle; 62 struct inode *inode; 63 struct fd f = {NULL}; 64 struct path path; 65 int error; 66 struct xfs_inode *ip; 67 68 if (cmd == XFS_IOC_FD_TO_HANDLE) { 69 f = fdget(hreq->fd); 70 if (!f.file) 71 return -EBADF; 72 inode = file_inode(f.file); 73 } else { 74 error = user_path_at(AT_FDCWD, hreq->path, 0, &path); 75 if (error) 76 return error; 77 inode = d_inode(path.dentry); 78 } 79 ip = XFS_I(inode); 80 81 /* 82 * We can only generate handles for inodes residing on a XFS filesystem, 83 * and only for regular files, directories or symbolic links. 84 */ 85 error = -EINVAL; 86 if (inode->i_sb->s_magic != XFS_SB_MAGIC) 87 goto out_put; 88 89 error = -EBADF; 90 if (!S_ISREG(inode->i_mode) && 91 !S_ISDIR(inode->i_mode) && 92 !S_ISLNK(inode->i_mode)) 93 goto out_put; 94 95 96 memcpy(&handle.ha_fsid, ip->i_mount->m_fixedfsid, sizeof(xfs_fsid_t)); 97 98 if (cmd == XFS_IOC_PATH_TO_FSHANDLE) { 99 /* 100 * This handle only contains an fsid, zero the rest. 101 */ 102 memset(&handle.ha_fid, 0, sizeof(handle.ha_fid)); 103 hsize = sizeof(xfs_fsid_t); 104 } else { 105 handle.ha_fid.fid_len = sizeof(xfs_fid_t) - 106 sizeof(handle.ha_fid.fid_len); 107 handle.ha_fid.fid_pad = 0; 108 handle.ha_fid.fid_gen = inode->i_generation; 109 handle.ha_fid.fid_ino = ip->i_ino; 110 hsize = sizeof(xfs_handle_t); 111 } 112 113 error = -EFAULT; 114 if (copy_to_user(hreq->ohandle, &handle, hsize) || 115 copy_to_user(hreq->ohandlen, &hsize, sizeof(__s32))) 116 goto out_put; 117 118 error = 0; 119 120 out_put: 121 if (cmd == XFS_IOC_FD_TO_HANDLE) 122 fdput(f); 123 else 124 path_put(&path); 125 return error; 126 } 127 128 /* 129 * No need to do permission checks on the various pathname components 130 * as the handle operations are privileged. 131 */ 132 STATIC int 133 xfs_handle_acceptable( 134 void *context, 135 struct dentry *dentry) 136 { 137 return 1; 138 } 139 140 /* 141 * Convert userspace handle data into a dentry. 142 */ 143 struct dentry * 144 xfs_handle_to_dentry( 145 struct file *parfilp, 146 void __user *uhandle, 147 u32 hlen) 148 { 149 xfs_handle_t handle; 150 struct xfs_fid64 fid; 151 152 /* 153 * Only allow handle opens under a directory. 154 */ 155 if (!S_ISDIR(file_inode(parfilp)->i_mode)) 156 return ERR_PTR(-ENOTDIR); 157 158 if (hlen != sizeof(xfs_handle_t)) 159 return ERR_PTR(-EINVAL); 160 if (copy_from_user(&handle, uhandle, hlen)) 161 return ERR_PTR(-EFAULT); 162 if (handle.ha_fid.fid_len != 163 sizeof(handle.ha_fid) - sizeof(handle.ha_fid.fid_len)) 164 return ERR_PTR(-EINVAL); 165 166 memset(&fid, 0, sizeof(struct fid)); 167 fid.ino = handle.ha_fid.fid_ino; 168 fid.gen = handle.ha_fid.fid_gen; 169 170 return exportfs_decode_fh(parfilp->f_path.mnt, (struct fid *)&fid, 3, 171 FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG, 172 xfs_handle_acceptable, NULL); 173 } 174 175 STATIC struct dentry * 176 xfs_handlereq_to_dentry( 177 struct file *parfilp, 178 xfs_fsop_handlereq_t *hreq) 179 { 180 return xfs_handle_to_dentry(parfilp, hreq->ihandle, hreq->ihandlen); 181 } 182 183 int 184 xfs_open_by_handle( 185 struct file *parfilp, 186 xfs_fsop_handlereq_t *hreq) 187 { 188 const struct cred *cred = current_cred(); 189 int error; 190 int fd; 191 int permflag; 192 struct file *filp; 193 struct inode *inode; 194 struct dentry *dentry; 195 fmode_t fmode; 196 struct path path; 197 198 if (!capable(CAP_SYS_ADMIN)) 199 return -EPERM; 200 201 dentry = xfs_handlereq_to_dentry(parfilp, hreq); 202 if (IS_ERR(dentry)) 203 return PTR_ERR(dentry); 204 inode = d_inode(dentry); 205 206 /* Restrict xfs_open_by_handle to directories & regular files. */ 207 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode))) { 208 error = -EPERM; 209 goto out_dput; 210 } 211 212 #if BITS_PER_LONG != 32 213 hreq->oflags |= O_LARGEFILE; 214 #endif 215 216 permflag = hreq->oflags; 217 fmode = OPEN_FMODE(permflag); 218 if ((!(permflag & O_APPEND) || (permflag & O_TRUNC)) && 219 (fmode & FMODE_WRITE) && IS_APPEND(inode)) { 220 error = -EPERM; 221 goto out_dput; 222 } 223 224 if ((fmode & FMODE_WRITE) && IS_IMMUTABLE(inode)) { 225 error = -EPERM; 226 goto out_dput; 227 } 228 229 /* Can't write directories. */ 230 if (S_ISDIR(inode->i_mode) && (fmode & FMODE_WRITE)) { 231 error = -EISDIR; 232 goto out_dput; 233 } 234 235 fd = get_unused_fd_flags(0); 236 if (fd < 0) { 237 error = fd; 238 goto out_dput; 239 } 240 241 path.mnt = parfilp->f_path.mnt; 242 path.dentry = dentry; 243 filp = dentry_open(&path, hreq->oflags, cred); 244 dput(dentry); 245 if (IS_ERR(filp)) { 246 put_unused_fd(fd); 247 return PTR_ERR(filp); 248 } 249 250 if (S_ISREG(inode->i_mode)) { 251 filp->f_flags |= O_NOATIME; 252 filp->f_mode |= FMODE_NOCMTIME; 253 } 254 255 fd_install(fd, filp); 256 return fd; 257 258 out_dput: 259 dput(dentry); 260 return error; 261 } 262 263 int 264 xfs_readlink_by_handle( 265 struct file *parfilp, 266 xfs_fsop_handlereq_t *hreq) 267 { 268 struct dentry *dentry; 269 __u32 olen; 270 int error; 271 272 if (!capable(CAP_SYS_ADMIN)) 273 return -EPERM; 274 275 dentry = xfs_handlereq_to_dentry(parfilp, hreq); 276 if (IS_ERR(dentry)) 277 return PTR_ERR(dentry); 278 279 /* Restrict this handle operation to symlinks only. */ 280 if (!d_is_symlink(dentry)) { 281 error = -EINVAL; 282 goto out_dput; 283 } 284 285 if (copy_from_user(&olen, hreq->ohandlen, sizeof(__u32))) { 286 error = -EFAULT; 287 goto out_dput; 288 } 289 290 error = vfs_readlink(dentry, hreq->ohandle, olen); 291 292 out_dput: 293 dput(dentry); 294 return error; 295 } 296 297 /* 298 * Format an attribute and copy it out to the user's buffer. 299 * Take care to check values and protect against them changing later, 300 * we may be reading them directly out of a user buffer. 301 */ 302 static void 303 xfs_ioc_attr_put_listent( 304 struct xfs_attr_list_context *context, 305 int flags, 306 unsigned char *name, 307 int namelen, 308 int valuelen) 309 { 310 struct xfs_attrlist *alist = context->buffer; 311 struct xfs_attrlist_ent *aep; 312 int arraytop; 313 314 ASSERT(!context->seen_enough); 315 ASSERT(context->count >= 0); 316 ASSERT(context->count < (ATTR_MAX_VALUELEN/8)); 317 ASSERT(context->firstu >= sizeof(*alist)); 318 ASSERT(context->firstu <= context->bufsize); 319 320 /* 321 * Only list entries in the right namespace. 322 */ 323 if (context->attr_filter != (flags & XFS_ATTR_NSP_ONDISK_MASK)) 324 return; 325 326 arraytop = sizeof(*alist) + 327 context->count * sizeof(alist->al_offset[0]); 328 329 /* decrement by the actual bytes used by the attr */ 330 context->firstu -= round_up(offsetof(struct xfs_attrlist_ent, a_name) + 331 namelen + 1, sizeof(uint32_t)); 332 if (context->firstu < arraytop) { 333 trace_xfs_attr_list_full(context); 334 alist->al_more = 1; 335 context->seen_enough = 1; 336 return; 337 } 338 339 aep = context->buffer + context->firstu; 340 aep->a_valuelen = valuelen; 341 memcpy(aep->a_name, name, namelen); 342 aep->a_name[namelen] = 0; 343 alist->al_offset[context->count++] = context->firstu; 344 alist->al_count = context->count; 345 trace_xfs_attr_list_add(context); 346 } 347 348 static unsigned int 349 xfs_attr_filter( 350 u32 ioc_flags) 351 { 352 if (ioc_flags & XFS_IOC_ATTR_ROOT) 353 return XFS_ATTR_ROOT; 354 if (ioc_flags & XFS_IOC_ATTR_SECURE) 355 return XFS_ATTR_SECURE; 356 return 0; 357 } 358 359 static unsigned int 360 xfs_attr_flags( 361 u32 ioc_flags) 362 { 363 if (ioc_flags & XFS_IOC_ATTR_CREATE) 364 return XATTR_CREATE; 365 if (ioc_flags & XFS_IOC_ATTR_REPLACE) 366 return XATTR_REPLACE; 367 return 0; 368 } 369 370 int 371 xfs_ioc_attr_list( 372 struct xfs_inode *dp, 373 void __user *ubuf, 374 int bufsize, 375 int flags, 376 struct xfs_attrlist_cursor __user *ucursor) 377 { 378 struct xfs_attr_list_context context = { }; 379 struct xfs_attrlist *alist; 380 void *buffer; 381 int error; 382 383 if (bufsize < sizeof(struct xfs_attrlist) || 384 bufsize > XFS_XATTR_LIST_MAX) 385 return -EINVAL; 386 387 /* 388 * Reject flags, only allow namespaces. 389 */ 390 if (flags & ~(XFS_IOC_ATTR_ROOT | XFS_IOC_ATTR_SECURE)) 391 return -EINVAL; 392 if (flags == (XFS_IOC_ATTR_ROOT | XFS_IOC_ATTR_SECURE)) 393 return -EINVAL; 394 395 /* 396 * Validate the cursor. 397 */ 398 if (copy_from_user(&context.cursor, ucursor, sizeof(context.cursor))) 399 return -EFAULT; 400 if (context.cursor.pad1 || context.cursor.pad2) 401 return -EINVAL; 402 if (!context.cursor.initted && 403 (context.cursor.hashval || context.cursor.blkno || 404 context.cursor.offset)) 405 return -EINVAL; 406 407 buffer = kmem_zalloc_large(bufsize, 0); 408 if (!buffer) 409 return -ENOMEM; 410 411 /* 412 * Initialize the output buffer. 413 */ 414 context.dp = dp; 415 context.resynch = 1; 416 context.attr_filter = xfs_attr_filter(flags); 417 context.buffer = buffer; 418 context.bufsize = round_down(bufsize, sizeof(uint32_t)); 419 context.firstu = context.bufsize; 420 context.put_listent = xfs_ioc_attr_put_listent; 421 422 alist = context.buffer; 423 alist->al_count = 0; 424 alist->al_more = 0; 425 alist->al_offset[0] = context.bufsize; 426 427 error = xfs_attr_list(&context); 428 if (error) 429 goto out_free; 430 431 if (copy_to_user(ubuf, buffer, bufsize) || 432 copy_to_user(ucursor, &context.cursor, sizeof(context.cursor))) 433 error = -EFAULT; 434 out_free: 435 kmem_free(buffer); 436 return error; 437 } 438 439 STATIC int 440 xfs_attrlist_by_handle( 441 struct file *parfilp, 442 struct xfs_fsop_attrlist_handlereq __user *p) 443 { 444 struct xfs_fsop_attrlist_handlereq al_hreq; 445 struct dentry *dentry; 446 int error = -ENOMEM; 447 448 if (!capable(CAP_SYS_ADMIN)) 449 return -EPERM; 450 if (copy_from_user(&al_hreq, p, sizeof(al_hreq))) 451 return -EFAULT; 452 453 dentry = xfs_handlereq_to_dentry(parfilp, &al_hreq.hreq); 454 if (IS_ERR(dentry)) 455 return PTR_ERR(dentry); 456 457 error = xfs_ioc_attr_list(XFS_I(d_inode(dentry)), al_hreq.buffer, 458 al_hreq.buflen, al_hreq.flags, &p->pos); 459 dput(dentry); 460 return error; 461 } 462 463 static int 464 xfs_attrmulti_attr_get( 465 struct inode *inode, 466 unsigned char *name, 467 unsigned char __user *ubuf, 468 uint32_t *len, 469 uint32_t flags) 470 { 471 struct xfs_da_args args = { 472 .dp = XFS_I(inode), 473 .attr_filter = xfs_attr_filter(flags), 474 .attr_flags = xfs_attr_flags(flags), 475 .name = name, 476 .namelen = strlen(name), 477 .valuelen = *len, 478 }; 479 int error; 480 481 if (*len > XFS_XATTR_SIZE_MAX) 482 return -EINVAL; 483 484 error = xfs_attr_get(&args); 485 if (error) 486 goto out_kfree; 487 488 *len = args.valuelen; 489 if (copy_to_user(ubuf, args.value, args.valuelen)) 490 error = -EFAULT; 491 492 out_kfree: 493 kmem_free(args.value); 494 return error; 495 } 496 497 static int 498 xfs_attrmulti_attr_set( 499 struct inode *inode, 500 unsigned char *name, 501 const unsigned char __user *ubuf, 502 uint32_t len, 503 uint32_t flags) 504 { 505 struct xfs_da_args args = { 506 .dp = XFS_I(inode), 507 .attr_filter = xfs_attr_filter(flags), 508 .attr_flags = xfs_attr_flags(flags), 509 .name = name, 510 .namelen = strlen(name), 511 }; 512 int error; 513 514 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 515 return -EPERM; 516 517 if (ubuf) { 518 if (len > XFS_XATTR_SIZE_MAX) 519 return -EINVAL; 520 args.value = memdup_user(ubuf, len); 521 if (IS_ERR(args.value)) 522 return PTR_ERR(args.value); 523 args.valuelen = len; 524 } 525 526 error = xfs_attr_set(&args); 527 if (!error && (flags & XFS_IOC_ATTR_ROOT)) 528 xfs_forget_acl(inode, name); 529 kfree(args.value); 530 return error; 531 } 532 533 int 534 xfs_ioc_attrmulti_one( 535 struct file *parfilp, 536 struct inode *inode, 537 uint32_t opcode, 538 void __user *uname, 539 void __user *value, 540 uint32_t *len, 541 uint32_t flags) 542 { 543 unsigned char *name; 544 int error; 545 546 if ((flags & XFS_IOC_ATTR_ROOT) && (flags & XFS_IOC_ATTR_SECURE)) 547 return -EINVAL; 548 549 name = strndup_user(uname, MAXNAMELEN); 550 if (IS_ERR(name)) 551 return PTR_ERR(name); 552 553 switch (opcode) { 554 case ATTR_OP_GET: 555 error = xfs_attrmulti_attr_get(inode, name, value, len, flags); 556 break; 557 case ATTR_OP_REMOVE: 558 value = NULL; 559 *len = 0; 560 /* fall through */ 561 case ATTR_OP_SET: 562 error = mnt_want_write_file(parfilp); 563 if (error) 564 break; 565 error = xfs_attrmulti_attr_set(inode, name, value, *len, flags); 566 mnt_drop_write_file(parfilp); 567 break; 568 default: 569 error = -EINVAL; 570 break; 571 } 572 573 kfree(name); 574 return error; 575 } 576 577 STATIC int 578 xfs_attrmulti_by_handle( 579 struct file *parfilp, 580 void __user *arg) 581 { 582 int error; 583 xfs_attr_multiop_t *ops; 584 xfs_fsop_attrmulti_handlereq_t am_hreq; 585 struct dentry *dentry; 586 unsigned int i, size; 587 588 if (!capable(CAP_SYS_ADMIN)) 589 return -EPERM; 590 if (copy_from_user(&am_hreq, arg, sizeof(xfs_fsop_attrmulti_handlereq_t))) 591 return -EFAULT; 592 593 /* overflow check */ 594 if (am_hreq.opcount >= INT_MAX / sizeof(xfs_attr_multiop_t)) 595 return -E2BIG; 596 597 dentry = xfs_handlereq_to_dentry(parfilp, &am_hreq.hreq); 598 if (IS_ERR(dentry)) 599 return PTR_ERR(dentry); 600 601 error = -E2BIG; 602 size = am_hreq.opcount * sizeof(xfs_attr_multiop_t); 603 if (!size || size > 16 * PAGE_SIZE) 604 goto out_dput; 605 606 ops = memdup_user(am_hreq.ops, size); 607 if (IS_ERR(ops)) { 608 error = PTR_ERR(ops); 609 goto out_dput; 610 } 611 612 error = 0; 613 for (i = 0; i < am_hreq.opcount; i++) { 614 ops[i].am_error = xfs_ioc_attrmulti_one(parfilp, 615 d_inode(dentry), ops[i].am_opcode, 616 ops[i].am_attrname, ops[i].am_attrvalue, 617 &ops[i].am_length, ops[i].am_flags); 618 } 619 620 if (copy_to_user(am_hreq.ops, ops, size)) 621 error = -EFAULT; 622 623 kfree(ops); 624 out_dput: 625 dput(dentry); 626 return error; 627 } 628 629 int 630 xfs_ioc_space( 631 struct file *filp, 632 xfs_flock64_t *bf) 633 { 634 struct inode *inode = file_inode(filp); 635 struct xfs_inode *ip = XFS_I(inode); 636 struct iattr iattr; 637 enum xfs_prealloc_flags flags = XFS_PREALLOC_CLEAR; 638 uint iolock = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL; 639 int error; 640 641 if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) 642 return -EPERM; 643 644 if (!(filp->f_mode & FMODE_WRITE)) 645 return -EBADF; 646 647 if (!S_ISREG(inode->i_mode)) 648 return -EINVAL; 649 650 if (xfs_is_always_cow_inode(ip)) 651 return -EOPNOTSUPP; 652 653 if (filp->f_flags & O_DSYNC) 654 flags |= XFS_PREALLOC_SYNC; 655 if (filp->f_mode & FMODE_NOCMTIME) 656 flags |= XFS_PREALLOC_INVISIBLE; 657 658 error = mnt_want_write_file(filp); 659 if (error) 660 return error; 661 662 xfs_ilock(ip, iolock); 663 error = xfs_break_layouts(inode, &iolock, BREAK_UNMAP); 664 if (error) 665 goto out_unlock; 666 inode_dio_wait(inode); 667 668 switch (bf->l_whence) { 669 case 0: /*SEEK_SET*/ 670 break; 671 case 1: /*SEEK_CUR*/ 672 bf->l_start += filp->f_pos; 673 break; 674 case 2: /*SEEK_END*/ 675 bf->l_start += XFS_ISIZE(ip); 676 break; 677 default: 678 error = -EINVAL; 679 goto out_unlock; 680 } 681 682 if (bf->l_start < 0 || bf->l_start > inode->i_sb->s_maxbytes) { 683 error = -EINVAL; 684 goto out_unlock; 685 } 686 687 if (bf->l_start > XFS_ISIZE(ip)) { 688 error = xfs_alloc_file_space(ip, XFS_ISIZE(ip), 689 bf->l_start - XFS_ISIZE(ip), 0); 690 if (error) 691 goto out_unlock; 692 } 693 694 iattr.ia_valid = ATTR_SIZE; 695 iattr.ia_size = bf->l_start; 696 error = xfs_vn_setattr_size(file_dentry(filp), &iattr); 697 if (error) 698 goto out_unlock; 699 700 error = xfs_update_prealloc_flags(ip, flags); 701 702 out_unlock: 703 xfs_iunlock(ip, iolock); 704 mnt_drop_write_file(filp); 705 return error; 706 } 707 708 /* Return 0 on success or positive error */ 709 int 710 xfs_fsbulkstat_one_fmt( 711 struct xfs_ibulk *breq, 712 const struct xfs_bulkstat *bstat) 713 { 714 struct xfs_bstat bs1; 715 716 xfs_bulkstat_to_bstat(breq->mp, &bs1, bstat); 717 if (copy_to_user(breq->ubuffer, &bs1, sizeof(bs1))) 718 return -EFAULT; 719 return xfs_ibulk_advance(breq, sizeof(struct xfs_bstat)); 720 } 721 722 int 723 xfs_fsinumbers_fmt( 724 struct xfs_ibulk *breq, 725 const struct xfs_inumbers *igrp) 726 { 727 struct xfs_inogrp ig1; 728 729 xfs_inumbers_to_inogrp(&ig1, igrp); 730 if (copy_to_user(breq->ubuffer, &ig1, sizeof(struct xfs_inogrp))) 731 return -EFAULT; 732 return xfs_ibulk_advance(breq, sizeof(struct xfs_inogrp)); 733 } 734 735 STATIC int 736 xfs_ioc_fsbulkstat( 737 xfs_mount_t *mp, 738 unsigned int cmd, 739 void __user *arg) 740 { 741 struct xfs_fsop_bulkreq bulkreq; 742 struct xfs_ibulk breq = { 743 .mp = mp, 744 .ocount = 0, 745 }; 746 xfs_ino_t lastino; 747 int error; 748 749 /* done = 1 if there are more stats to get and if bulkstat */ 750 /* should be called again (unused here, but used in dmapi) */ 751 752 if (!capable(CAP_SYS_ADMIN)) 753 return -EPERM; 754 755 if (XFS_FORCED_SHUTDOWN(mp)) 756 return -EIO; 757 758 if (copy_from_user(&bulkreq, arg, sizeof(struct xfs_fsop_bulkreq))) 759 return -EFAULT; 760 761 if (copy_from_user(&lastino, bulkreq.lastip, sizeof(__s64))) 762 return -EFAULT; 763 764 if (bulkreq.icount <= 0) 765 return -EINVAL; 766 767 if (bulkreq.ubuffer == NULL) 768 return -EINVAL; 769 770 breq.ubuffer = bulkreq.ubuffer; 771 breq.icount = bulkreq.icount; 772 773 /* 774 * FSBULKSTAT_SINGLE expects that *lastip contains the inode number 775 * that we want to stat. However, FSINUMBERS and FSBULKSTAT expect 776 * that *lastip contains either zero or the number of the last inode to 777 * be examined by the previous call and return results starting with 778 * the next inode after that. The new bulk request back end functions 779 * take the inode to start with, so we have to compute the startino 780 * parameter from lastino to maintain correct function. lastino == 0 781 * is a special case because it has traditionally meant "first inode 782 * in filesystem". 783 */ 784 if (cmd == XFS_IOC_FSINUMBERS) { 785 breq.startino = lastino ? lastino + 1 : 0; 786 error = xfs_inumbers(&breq, xfs_fsinumbers_fmt); 787 lastino = breq.startino - 1; 788 } else if (cmd == XFS_IOC_FSBULKSTAT_SINGLE) { 789 breq.startino = lastino; 790 breq.icount = 1; 791 error = xfs_bulkstat_one(&breq, xfs_fsbulkstat_one_fmt); 792 } else { /* XFS_IOC_FSBULKSTAT */ 793 breq.startino = lastino ? lastino + 1 : 0; 794 error = xfs_bulkstat(&breq, xfs_fsbulkstat_one_fmt); 795 lastino = breq.startino - 1; 796 } 797 798 if (error) 799 return error; 800 801 if (bulkreq.lastip != NULL && 802 copy_to_user(bulkreq.lastip, &lastino, sizeof(xfs_ino_t))) 803 return -EFAULT; 804 805 if (bulkreq.ocount != NULL && 806 copy_to_user(bulkreq.ocount, &breq.ocount, sizeof(__s32))) 807 return -EFAULT; 808 809 return 0; 810 } 811 812 /* Return 0 on success or positive error */ 813 static int 814 xfs_bulkstat_fmt( 815 struct xfs_ibulk *breq, 816 const struct xfs_bulkstat *bstat) 817 { 818 if (copy_to_user(breq->ubuffer, bstat, sizeof(struct xfs_bulkstat))) 819 return -EFAULT; 820 return xfs_ibulk_advance(breq, sizeof(struct xfs_bulkstat)); 821 } 822 823 /* 824 * Check the incoming bulk request @hdr from userspace and initialize the 825 * internal @breq bulk request appropriately. Returns 0 if the bulk request 826 * should proceed; -ECANCELED if there's nothing to do; or the usual 827 * negative error code. 828 */ 829 static int 830 xfs_bulk_ireq_setup( 831 struct xfs_mount *mp, 832 struct xfs_bulk_ireq *hdr, 833 struct xfs_ibulk *breq, 834 void __user *ubuffer) 835 { 836 if (hdr->icount == 0 || 837 (hdr->flags & ~XFS_BULK_IREQ_FLAGS_ALL) || 838 memchr_inv(hdr->reserved, 0, sizeof(hdr->reserved))) 839 return -EINVAL; 840 841 breq->startino = hdr->ino; 842 breq->ubuffer = ubuffer; 843 breq->icount = hdr->icount; 844 breq->ocount = 0; 845 breq->flags = 0; 846 847 /* 848 * The @ino parameter is a special value, so we must look it up here. 849 * We're not allowed to have IREQ_AGNO, and we only return one inode 850 * worth of data. 851 */ 852 if (hdr->flags & XFS_BULK_IREQ_SPECIAL) { 853 if (hdr->flags & XFS_BULK_IREQ_AGNO) 854 return -EINVAL; 855 856 switch (hdr->ino) { 857 case XFS_BULK_IREQ_SPECIAL_ROOT: 858 hdr->ino = mp->m_sb.sb_rootino; 859 break; 860 default: 861 return -EINVAL; 862 } 863 breq->icount = 1; 864 } 865 866 /* 867 * The IREQ_AGNO flag means that we only want results from a given AG. 868 * If @hdr->ino is zero, we start iterating in that AG. If @hdr->ino is 869 * beyond the specified AG then we return no results. 870 */ 871 if (hdr->flags & XFS_BULK_IREQ_AGNO) { 872 if (hdr->agno >= mp->m_sb.sb_agcount) 873 return -EINVAL; 874 875 if (breq->startino == 0) 876 breq->startino = XFS_AGINO_TO_INO(mp, hdr->agno, 0); 877 else if (XFS_INO_TO_AGNO(mp, breq->startino) < hdr->agno) 878 return -EINVAL; 879 880 breq->flags |= XFS_IBULK_SAME_AG; 881 882 /* Asking for an inode past the end of the AG? We're done! */ 883 if (XFS_INO_TO_AGNO(mp, breq->startino) > hdr->agno) 884 return -ECANCELED; 885 } else if (hdr->agno) 886 return -EINVAL; 887 888 /* Asking for an inode past the end of the FS? We're done! */ 889 if (XFS_INO_TO_AGNO(mp, breq->startino) >= mp->m_sb.sb_agcount) 890 return -ECANCELED; 891 892 return 0; 893 } 894 895 /* 896 * Update the userspace bulk request @hdr to reflect the end state of the 897 * internal bulk request @breq. 898 */ 899 static void 900 xfs_bulk_ireq_teardown( 901 struct xfs_bulk_ireq *hdr, 902 struct xfs_ibulk *breq) 903 { 904 hdr->ino = breq->startino; 905 hdr->ocount = breq->ocount; 906 } 907 908 /* Handle the v5 bulkstat ioctl. */ 909 STATIC int 910 xfs_ioc_bulkstat( 911 struct xfs_mount *mp, 912 unsigned int cmd, 913 struct xfs_bulkstat_req __user *arg) 914 { 915 struct xfs_bulk_ireq hdr; 916 struct xfs_ibulk breq = { 917 .mp = mp, 918 }; 919 int error; 920 921 if (!capable(CAP_SYS_ADMIN)) 922 return -EPERM; 923 924 if (XFS_FORCED_SHUTDOWN(mp)) 925 return -EIO; 926 927 if (copy_from_user(&hdr, &arg->hdr, sizeof(hdr))) 928 return -EFAULT; 929 930 error = xfs_bulk_ireq_setup(mp, &hdr, &breq, arg->bulkstat); 931 if (error == -ECANCELED) 932 goto out_teardown; 933 if (error < 0) 934 return error; 935 936 error = xfs_bulkstat(&breq, xfs_bulkstat_fmt); 937 if (error) 938 return error; 939 940 out_teardown: 941 xfs_bulk_ireq_teardown(&hdr, &breq); 942 if (copy_to_user(&arg->hdr, &hdr, sizeof(hdr))) 943 return -EFAULT; 944 945 return 0; 946 } 947 948 STATIC int 949 xfs_inumbers_fmt( 950 struct xfs_ibulk *breq, 951 const struct xfs_inumbers *igrp) 952 { 953 if (copy_to_user(breq->ubuffer, igrp, sizeof(struct xfs_inumbers))) 954 return -EFAULT; 955 return xfs_ibulk_advance(breq, sizeof(struct xfs_inumbers)); 956 } 957 958 /* Handle the v5 inumbers ioctl. */ 959 STATIC int 960 xfs_ioc_inumbers( 961 struct xfs_mount *mp, 962 unsigned int cmd, 963 struct xfs_inumbers_req __user *arg) 964 { 965 struct xfs_bulk_ireq hdr; 966 struct xfs_ibulk breq = { 967 .mp = mp, 968 }; 969 int error; 970 971 if (!capable(CAP_SYS_ADMIN)) 972 return -EPERM; 973 974 if (XFS_FORCED_SHUTDOWN(mp)) 975 return -EIO; 976 977 if (copy_from_user(&hdr, &arg->hdr, sizeof(hdr))) 978 return -EFAULT; 979 980 error = xfs_bulk_ireq_setup(mp, &hdr, &breq, arg->inumbers); 981 if (error == -ECANCELED) 982 goto out_teardown; 983 if (error < 0) 984 return error; 985 986 error = xfs_inumbers(&breq, xfs_inumbers_fmt); 987 if (error) 988 return error; 989 990 out_teardown: 991 xfs_bulk_ireq_teardown(&hdr, &breq); 992 if (copy_to_user(&arg->hdr, &hdr, sizeof(hdr))) 993 return -EFAULT; 994 995 return 0; 996 } 997 998 STATIC int 999 xfs_ioc_fsgeometry( 1000 struct xfs_mount *mp, 1001 void __user *arg, 1002 int struct_version) 1003 { 1004 struct xfs_fsop_geom fsgeo; 1005 size_t len; 1006 1007 xfs_fs_geometry(&mp->m_sb, &fsgeo, struct_version); 1008 1009 if (struct_version <= 3) 1010 len = sizeof(struct xfs_fsop_geom_v1); 1011 else if (struct_version == 4) 1012 len = sizeof(struct xfs_fsop_geom_v4); 1013 else { 1014 xfs_fsop_geom_health(mp, &fsgeo); 1015 len = sizeof(fsgeo); 1016 } 1017 1018 if (copy_to_user(arg, &fsgeo, len)) 1019 return -EFAULT; 1020 return 0; 1021 } 1022 1023 STATIC int 1024 xfs_ioc_ag_geometry( 1025 struct xfs_mount *mp, 1026 void __user *arg) 1027 { 1028 struct xfs_ag_geometry ageo; 1029 int error; 1030 1031 if (copy_from_user(&ageo, arg, sizeof(ageo))) 1032 return -EFAULT; 1033 if (ageo.ag_flags) 1034 return -EINVAL; 1035 if (memchr_inv(&ageo.ag_reserved, 0, sizeof(ageo.ag_reserved))) 1036 return -EINVAL; 1037 1038 error = xfs_ag_get_geometry(mp, ageo.ag_number, &ageo); 1039 if (error) 1040 return error; 1041 1042 if (copy_to_user(arg, &ageo, sizeof(ageo))) 1043 return -EFAULT; 1044 return 0; 1045 } 1046 1047 /* 1048 * Linux extended inode flags interface. 1049 */ 1050 1051 STATIC unsigned int 1052 xfs_merge_ioc_xflags( 1053 unsigned int flags, 1054 unsigned int start) 1055 { 1056 unsigned int xflags = start; 1057 1058 if (flags & FS_IMMUTABLE_FL) 1059 xflags |= FS_XFLAG_IMMUTABLE; 1060 else 1061 xflags &= ~FS_XFLAG_IMMUTABLE; 1062 if (flags & FS_APPEND_FL) 1063 xflags |= FS_XFLAG_APPEND; 1064 else 1065 xflags &= ~FS_XFLAG_APPEND; 1066 if (flags & FS_SYNC_FL) 1067 xflags |= FS_XFLAG_SYNC; 1068 else 1069 xflags &= ~FS_XFLAG_SYNC; 1070 if (flags & FS_NOATIME_FL) 1071 xflags |= FS_XFLAG_NOATIME; 1072 else 1073 xflags &= ~FS_XFLAG_NOATIME; 1074 if (flags & FS_NODUMP_FL) 1075 xflags |= FS_XFLAG_NODUMP; 1076 else 1077 xflags &= ~FS_XFLAG_NODUMP; 1078 1079 return xflags; 1080 } 1081 1082 STATIC unsigned int 1083 xfs_di2lxflags( 1084 uint16_t di_flags) 1085 { 1086 unsigned int flags = 0; 1087 1088 if (di_flags & XFS_DIFLAG_IMMUTABLE) 1089 flags |= FS_IMMUTABLE_FL; 1090 if (di_flags & XFS_DIFLAG_APPEND) 1091 flags |= FS_APPEND_FL; 1092 if (di_flags & XFS_DIFLAG_SYNC) 1093 flags |= FS_SYNC_FL; 1094 if (di_flags & XFS_DIFLAG_NOATIME) 1095 flags |= FS_NOATIME_FL; 1096 if (di_flags & XFS_DIFLAG_NODUMP) 1097 flags |= FS_NODUMP_FL; 1098 return flags; 1099 } 1100 1101 static void 1102 xfs_fill_fsxattr( 1103 struct xfs_inode *ip, 1104 bool attr, 1105 struct fsxattr *fa) 1106 { 1107 simple_fill_fsxattr(fa, xfs_ip2xflags(ip)); 1108 fa->fsx_extsize = ip->i_d.di_extsize << ip->i_mount->m_sb.sb_blocklog; 1109 fa->fsx_cowextsize = ip->i_d.di_cowextsize << 1110 ip->i_mount->m_sb.sb_blocklog; 1111 fa->fsx_projid = ip->i_d.di_projid; 1112 1113 if (attr) { 1114 if (ip->i_afp) { 1115 if (ip->i_afp->if_flags & XFS_IFEXTENTS) 1116 fa->fsx_nextents = xfs_iext_count(ip->i_afp); 1117 else 1118 fa->fsx_nextents = ip->i_d.di_anextents; 1119 } else 1120 fa->fsx_nextents = 0; 1121 } else { 1122 if (ip->i_df.if_flags & XFS_IFEXTENTS) 1123 fa->fsx_nextents = xfs_iext_count(&ip->i_df); 1124 else 1125 fa->fsx_nextents = ip->i_d.di_nextents; 1126 } 1127 } 1128 1129 STATIC int 1130 xfs_ioc_fsgetxattr( 1131 xfs_inode_t *ip, 1132 int attr, 1133 void __user *arg) 1134 { 1135 struct fsxattr fa; 1136 1137 xfs_ilock(ip, XFS_ILOCK_SHARED); 1138 xfs_fill_fsxattr(ip, attr, &fa); 1139 xfs_iunlock(ip, XFS_ILOCK_SHARED); 1140 1141 if (copy_to_user(arg, &fa, sizeof(fa))) 1142 return -EFAULT; 1143 return 0; 1144 } 1145 1146 STATIC uint16_t 1147 xfs_flags2diflags( 1148 struct xfs_inode *ip, 1149 unsigned int xflags) 1150 { 1151 /* can't set PREALLOC this way, just preserve it */ 1152 uint16_t di_flags = 1153 (ip->i_d.di_flags & XFS_DIFLAG_PREALLOC); 1154 1155 if (xflags & FS_XFLAG_IMMUTABLE) 1156 di_flags |= XFS_DIFLAG_IMMUTABLE; 1157 if (xflags & FS_XFLAG_APPEND) 1158 di_flags |= XFS_DIFLAG_APPEND; 1159 if (xflags & FS_XFLAG_SYNC) 1160 di_flags |= XFS_DIFLAG_SYNC; 1161 if (xflags & FS_XFLAG_NOATIME) 1162 di_flags |= XFS_DIFLAG_NOATIME; 1163 if (xflags & FS_XFLAG_NODUMP) 1164 di_flags |= XFS_DIFLAG_NODUMP; 1165 if (xflags & FS_XFLAG_NODEFRAG) 1166 di_flags |= XFS_DIFLAG_NODEFRAG; 1167 if (xflags & FS_XFLAG_FILESTREAM) 1168 di_flags |= XFS_DIFLAG_FILESTREAM; 1169 if (S_ISDIR(VFS_I(ip)->i_mode)) { 1170 if (xflags & FS_XFLAG_RTINHERIT) 1171 di_flags |= XFS_DIFLAG_RTINHERIT; 1172 if (xflags & FS_XFLAG_NOSYMLINKS) 1173 di_flags |= XFS_DIFLAG_NOSYMLINKS; 1174 if (xflags & FS_XFLAG_EXTSZINHERIT) 1175 di_flags |= XFS_DIFLAG_EXTSZINHERIT; 1176 if (xflags & FS_XFLAG_PROJINHERIT) 1177 di_flags |= XFS_DIFLAG_PROJINHERIT; 1178 } else if (S_ISREG(VFS_I(ip)->i_mode)) { 1179 if (xflags & FS_XFLAG_REALTIME) 1180 di_flags |= XFS_DIFLAG_REALTIME; 1181 if (xflags & FS_XFLAG_EXTSIZE) 1182 di_flags |= XFS_DIFLAG_EXTSIZE; 1183 } 1184 1185 return di_flags; 1186 } 1187 1188 STATIC uint64_t 1189 xfs_flags2diflags2( 1190 struct xfs_inode *ip, 1191 unsigned int xflags) 1192 { 1193 uint64_t di_flags2 = 1194 (ip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK); 1195 1196 if (xflags & FS_XFLAG_DAX) 1197 di_flags2 |= XFS_DIFLAG2_DAX; 1198 if (xflags & FS_XFLAG_COWEXTSIZE) 1199 di_flags2 |= XFS_DIFLAG2_COWEXTSIZE; 1200 1201 return di_flags2; 1202 } 1203 1204 STATIC void 1205 xfs_diflags_to_linux( 1206 struct xfs_inode *ip) 1207 { 1208 struct inode *inode = VFS_I(ip); 1209 unsigned int xflags = xfs_ip2xflags(ip); 1210 1211 if (xflags & FS_XFLAG_IMMUTABLE) 1212 inode->i_flags |= S_IMMUTABLE; 1213 else 1214 inode->i_flags &= ~S_IMMUTABLE; 1215 if (xflags & FS_XFLAG_APPEND) 1216 inode->i_flags |= S_APPEND; 1217 else 1218 inode->i_flags &= ~S_APPEND; 1219 if (xflags & FS_XFLAG_SYNC) 1220 inode->i_flags |= S_SYNC; 1221 else 1222 inode->i_flags &= ~S_SYNC; 1223 if (xflags & FS_XFLAG_NOATIME) 1224 inode->i_flags |= S_NOATIME; 1225 else 1226 inode->i_flags &= ~S_NOATIME; 1227 #if 0 /* disabled until the flag switching races are sorted out */ 1228 if (xflags & FS_XFLAG_DAX) 1229 inode->i_flags |= S_DAX; 1230 else 1231 inode->i_flags &= ~S_DAX; 1232 #endif 1233 } 1234 1235 static int 1236 xfs_ioctl_setattr_xflags( 1237 struct xfs_trans *tp, 1238 struct xfs_inode *ip, 1239 struct fsxattr *fa) 1240 { 1241 struct xfs_mount *mp = ip->i_mount; 1242 uint64_t di_flags2; 1243 1244 /* Can't change realtime flag if any extents are allocated. */ 1245 if ((ip->i_d.di_nextents || ip->i_delayed_blks) && 1246 XFS_IS_REALTIME_INODE(ip) != (fa->fsx_xflags & FS_XFLAG_REALTIME)) 1247 return -EINVAL; 1248 1249 /* If realtime flag is set then must have realtime device */ 1250 if (fa->fsx_xflags & FS_XFLAG_REALTIME) { 1251 if (mp->m_sb.sb_rblocks == 0 || mp->m_sb.sb_rextsize == 0 || 1252 (ip->i_d.di_extsize % mp->m_sb.sb_rextsize)) 1253 return -EINVAL; 1254 } 1255 1256 /* Clear reflink if we are actually able to set the rt flag. */ 1257 if ((fa->fsx_xflags & FS_XFLAG_REALTIME) && xfs_is_reflink_inode(ip)) 1258 ip->i_d.di_flags2 &= ~XFS_DIFLAG2_REFLINK; 1259 1260 /* Don't allow us to set DAX mode for a reflinked file for now. */ 1261 if ((fa->fsx_xflags & FS_XFLAG_DAX) && xfs_is_reflink_inode(ip)) 1262 return -EINVAL; 1263 1264 /* diflags2 only valid for v3 inodes. */ 1265 di_flags2 = xfs_flags2diflags2(ip, fa->fsx_xflags); 1266 if (di_flags2 && !xfs_sb_version_has_v3inode(&mp->m_sb)) 1267 return -EINVAL; 1268 1269 ip->i_d.di_flags = xfs_flags2diflags(ip, fa->fsx_xflags); 1270 ip->i_d.di_flags2 = di_flags2; 1271 1272 xfs_diflags_to_linux(ip); 1273 xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG); 1274 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); 1275 XFS_STATS_INC(mp, xs_ig_attrchg); 1276 return 0; 1277 } 1278 1279 /* 1280 * If we are changing DAX flags, we have to ensure the file is clean and any 1281 * cached objects in the address space are invalidated and removed. This 1282 * requires us to lock out other IO and page faults similar to a truncate 1283 * operation. The locks need to be held until the transaction has been committed 1284 * so that the cache invalidation is atomic with respect to the DAX flag 1285 * manipulation. 1286 */ 1287 static int 1288 xfs_ioctl_setattr_dax_invalidate( 1289 struct xfs_inode *ip, 1290 struct fsxattr *fa, 1291 int *join_flags) 1292 { 1293 struct inode *inode = VFS_I(ip); 1294 struct super_block *sb = inode->i_sb; 1295 int error; 1296 1297 *join_flags = 0; 1298 1299 /* 1300 * It is only valid to set the DAX flag on regular files and 1301 * directories on filesystems where the block size is equal to the page 1302 * size. On directories it serves as an inherited hint so we don't 1303 * have to check the device for dax support or flush pagecache. 1304 */ 1305 if (fa->fsx_xflags & FS_XFLAG_DAX) { 1306 struct xfs_buftarg *target = xfs_inode_buftarg(ip); 1307 1308 if (!bdev_dax_supported(target->bt_bdev, sb->s_blocksize)) 1309 return -EINVAL; 1310 } 1311 1312 /* If the DAX state is not changing, we have nothing to do here. */ 1313 if ((fa->fsx_xflags & FS_XFLAG_DAX) && IS_DAX(inode)) 1314 return 0; 1315 if (!(fa->fsx_xflags & FS_XFLAG_DAX) && !IS_DAX(inode)) 1316 return 0; 1317 1318 if (S_ISDIR(inode->i_mode)) 1319 return 0; 1320 1321 /* lock, flush and invalidate mapping in preparation for flag change */ 1322 xfs_ilock(ip, XFS_MMAPLOCK_EXCL | XFS_IOLOCK_EXCL); 1323 error = filemap_write_and_wait(inode->i_mapping); 1324 if (error) 1325 goto out_unlock; 1326 error = invalidate_inode_pages2(inode->i_mapping); 1327 if (error) 1328 goto out_unlock; 1329 1330 *join_flags = XFS_MMAPLOCK_EXCL | XFS_IOLOCK_EXCL; 1331 return 0; 1332 1333 out_unlock: 1334 xfs_iunlock(ip, XFS_MMAPLOCK_EXCL | XFS_IOLOCK_EXCL); 1335 return error; 1336 1337 } 1338 1339 /* 1340 * Set up the transaction structure for the setattr operation, checking that we 1341 * have permission to do so. On success, return a clean transaction and the 1342 * inode locked exclusively ready for further operation specific checks. On 1343 * failure, return an error without modifying or locking the inode. 1344 * 1345 * The inode might already be IO locked on call. If this is the case, it is 1346 * indicated in @join_flags and we take full responsibility for ensuring they 1347 * are unlocked from now on. Hence if we have an error here, we still have to 1348 * unlock them. Otherwise, once they are joined to the transaction, they will 1349 * be unlocked on commit/cancel. 1350 */ 1351 static struct xfs_trans * 1352 xfs_ioctl_setattr_get_trans( 1353 struct xfs_inode *ip, 1354 int join_flags) 1355 { 1356 struct xfs_mount *mp = ip->i_mount; 1357 struct xfs_trans *tp; 1358 int error = -EROFS; 1359 1360 if (mp->m_flags & XFS_MOUNT_RDONLY) 1361 goto out_unlock; 1362 error = -EIO; 1363 if (XFS_FORCED_SHUTDOWN(mp)) 1364 goto out_unlock; 1365 1366 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp); 1367 if (error) 1368 goto out_unlock; 1369 1370 xfs_ilock(ip, XFS_ILOCK_EXCL); 1371 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL | join_flags); 1372 join_flags = 0; 1373 1374 /* 1375 * CAP_FOWNER overrides the following restrictions: 1376 * 1377 * The user ID of the calling process must be equal to the file owner 1378 * ID, except in cases where the CAP_FSETID capability is applicable. 1379 */ 1380 if (!inode_owner_or_capable(VFS_I(ip))) { 1381 error = -EPERM; 1382 goto out_cancel; 1383 } 1384 1385 if (mp->m_flags & XFS_MOUNT_WSYNC) 1386 xfs_trans_set_sync(tp); 1387 1388 return tp; 1389 1390 out_cancel: 1391 xfs_trans_cancel(tp); 1392 out_unlock: 1393 if (join_flags) 1394 xfs_iunlock(ip, join_flags); 1395 return ERR_PTR(error); 1396 } 1397 1398 /* 1399 * extent size hint validation is somewhat cumbersome. Rules are: 1400 * 1401 * 1. extent size hint is only valid for directories and regular files 1402 * 2. FS_XFLAG_EXTSIZE is only valid for regular files 1403 * 3. FS_XFLAG_EXTSZINHERIT is only valid for directories. 1404 * 4. can only be changed on regular files if no extents are allocated 1405 * 5. can be changed on directories at any time 1406 * 6. extsize hint of 0 turns off hints, clears inode flags. 1407 * 7. Extent size must be a multiple of the appropriate block size. 1408 * 8. for non-realtime files, the extent size hint must be limited 1409 * to half the AG size to avoid alignment extending the extent beyond the 1410 * limits of the AG. 1411 * 1412 * Please keep this function in sync with xfs_scrub_inode_extsize. 1413 */ 1414 static int 1415 xfs_ioctl_setattr_check_extsize( 1416 struct xfs_inode *ip, 1417 struct fsxattr *fa) 1418 { 1419 struct xfs_mount *mp = ip->i_mount; 1420 xfs_extlen_t size; 1421 xfs_fsblock_t extsize_fsb; 1422 1423 if (S_ISREG(VFS_I(ip)->i_mode) && ip->i_d.di_nextents && 1424 ((ip->i_d.di_extsize << mp->m_sb.sb_blocklog) != fa->fsx_extsize)) 1425 return -EINVAL; 1426 1427 if (fa->fsx_extsize == 0) 1428 return 0; 1429 1430 extsize_fsb = XFS_B_TO_FSB(mp, fa->fsx_extsize); 1431 if (extsize_fsb > MAXEXTLEN) 1432 return -EINVAL; 1433 1434 if (XFS_IS_REALTIME_INODE(ip) || 1435 (fa->fsx_xflags & FS_XFLAG_REALTIME)) { 1436 size = mp->m_sb.sb_rextsize << mp->m_sb.sb_blocklog; 1437 } else { 1438 size = mp->m_sb.sb_blocksize; 1439 if (extsize_fsb > mp->m_sb.sb_agblocks / 2) 1440 return -EINVAL; 1441 } 1442 1443 if (fa->fsx_extsize % size) 1444 return -EINVAL; 1445 1446 return 0; 1447 } 1448 1449 /* 1450 * CoW extent size hint validation rules are: 1451 * 1452 * 1. CoW extent size hint can only be set if reflink is enabled on the fs. 1453 * The inode does not have to have any shared blocks, but it must be a v3. 1454 * 2. FS_XFLAG_COWEXTSIZE is only valid for directories and regular files; 1455 * for a directory, the hint is propagated to new files. 1456 * 3. Can be changed on files & directories at any time. 1457 * 4. CoW extsize hint of 0 turns off hints, clears inode flags. 1458 * 5. Extent size must be a multiple of the appropriate block size. 1459 * 6. The extent size hint must be limited to half the AG size to avoid 1460 * alignment extending the extent beyond the limits of the AG. 1461 * 1462 * Please keep this function in sync with xfs_scrub_inode_cowextsize. 1463 */ 1464 static int 1465 xfs_ioctl_setattr_check_cowextsize( 1466 struct xfs_inode *ip, 1467 struct fsxattr *fa) 1468 { 1469 struct xfs_mount *mp = ip->i_mount; 1470 xfs_extlen_t size; 1471 xfs_fsblock_t cowextsize_fsb; 1472 1473 if (!(fa->fsx_xflags & FS_XFLAG_COWEXTSIZE)) 1474 return 0; 1475 1476 if (!xfs_sb_version_hasreflink(&ip->i_mount->m_sb)) 1477 return -EINVAL; 1478 1479 if (fa->fsx_cowextsize == 0) 1480 return 0; 1481 1482 cowextsize_fsb = XFS_B_TO_FSB(mp, fa->fsx_cowextsize); 1483 if (cowextsize_fsb > MAXEXTLEN) 1484 return -EINVAL; 1485 1486 size = mp->m_sb.sb_blocksize; 1487 if (cowextsize_fsb > mp->m_sb.sb_agblocks / 2) 1488 return -EINVAL; 1489 1490 if (fa->fsx_cowextsize % size) 1491 return -EINVAL; 1492 1493 return 0; 1494 } 1495 1496 static int 1497 xfs_ioctl_setattr_check_projid( 1498 struct xfs_inode *ip, 1499 struct fsxattr *fa) 1500 { 1501 /* Disallow 32bit project ids if projid32bit feature is not enabled. */ 1502 if (fa->fsx_projid > (uint16_t)-1 && 1503 !xfs_sb_version_hasprojid32bit(&ip->i_mount->m_sb)) 1504 return -EINVAL; 1505 return 0; 1506 } 1507 1508 STATIC int 1509 xfs_ioctl_setattr( 1510 xfs_inode_t *ip, 1511 struct fsxattr *fa) 1512 { 1513 struct fsxattr old_fa; 1514 struct xfs_mount *mp = ip->i_mount; 1515 struct xfs_trans *tp; 1516 struct xfs_dquot *udqp = NULL; 1517 struct xfs_dquot *pdqp = NULL; 1518 struct xfs_dquot *olddquot = NULL; 1519 int code; 1520 int join_flags = 0; 1521 1522 trace_xfs_ioctl_setattr(ip); 1523 1524 code = xfs_ioctl_setattr_check_projid(ip, fa); 1525 if (code) 1526 return code; 1527 1528 /* 1529 * If disk quotas is on, we make sure that the dquots do exist on disk, 1530 * before we start any other transactions. Trying to do this later 1531 * is messy. We don't care to take a readlock to look at the ids 1532 * in inode here, because we can't hold it across the trans_reserve. 1533 * If the IDs do change before we take the ilock, we're covered 1534 * because the i_*dquot fields will get updated anyway. 1535 */ 1536 if (XFS_IS_QUOTA_ON(mp)) { 1537 code = xfs_qm_vop_dqalloc(ip, VFS_I(ip)->i_uid, 1538 VFS_I(ip)->i_gid, fa->fsx_projid, 1539 XFS_QMOPT_PQUOTA, &udqp, NULL, &pdqp); 1540 if (code) 1541 return code; 1542 } 1543 1544 /* 1545 * Changing DAX config may require inode locking for mapping 1546 * invalidation. These need to be held all the way to transaction commit 1547 * or cancel time, so need to be passed through to 1548 * xfs_ioctl_setattr_get_trans() so it can apply them to the join call 1549 * appropriately. 1550 */ 1551 code = xfs_ioctl_setattr_dax_invalidate(ip, fa, &join_flags); 1552 if (code) 1553 goto error_free_dquots; 1554 1555 tp = xfs_ioctl_setattr_get_trans(ip, join_flags); 1556 if (IS_ERR(tp)) { 1557 code = PTR_ERR(tp); 1558 goto error_free_dquots; 1559 } 1560 1561 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_PQUOTA_ON(mp) && 1562 ip->i_d.di_projid != fa->fsx_projid) { 1563 code = xfs_qm_vop_chown_reserve(tp, ip, udqp, NULL, pdqp, 1564 capable(CAP_FOWNER) ? XFS_QMOPT_FORCE_RES : 0); 1565 if (code) /* out of quota */ 1566 goto error_trans_cancel; 1567 } 1568 1569 xfs_fill_fsxattr(ip, false, &old_fa); 1570 code = vfs_ioc_fssetxattr_check(VFS_I(ip), &old_fa, fa); 1571 if (code) 1572 goto error_trans_cancel; 1573 1574 code = xfs_ioctl_setattr_check_extsize(ip, fa); 1575 if (code) 1576 goto error_trans_cancel; 1577 1578 code = xfs_ioctl_setattr_check_cowextsize(ip, fa); 1579 if (code) 1580 goto error_trans_cancel; 1581 1582 code = xfs_ioctl_setattr_xflags(tp, ip, fa); 1583 if (code) 1584 goto error_trans_cancel; 1585 1586 /* 1587 * Change file ownership. Must be the owner or privileged. CAP_FSETID 1588 * overrides the following restrictions: 1589 * 1590 * The set-user-ID and set-group-ID bits of a file will be cleared upon 1591 * successful return from chown() 1592 */ 1593 1594 if ((VFS_I(ip)->i_mode & (S_ISUID|S_ISGID)) && 1595 !capable_wrt_inode_uidgid(VFS_I(ip), CAP_FSETID)) 1596 VFS_I(ip)->i_mode &= ~(S_ISUID|S_ISGID); 1597 1598 /* Change the ownerships and register project quota modifications */ 1599 if (ip->i_d.di_projid != fa->fsx_projid) { 1600 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_PQUOTA_ON(mp)) { 1601 olddquot = xfs_qm_vop_chown(tp, ip, 1602 &ip->i_pdquot, pdqp); 1603 } 1604 ip->i_d.di_projid = fa->fsx_projid; 1605 } 1606 1607 /* 1608 * Only set the extent size hint if we've already determined that the 1609 * extent size hint should be set on the inode. If no extent size flags 1610 * are set on the inode then unconditionally clear the extent size hint. 1611 */ 1612 if (ip->i_d.di_flags & (XFS_DIFLAG_EXTSIZE | XFS_DIFLAG_EXTSZINHERIT)) 1613 ip->i_d.di_extsize = fa->fsx_extsize >> mp->m_sb.sb_blocklog; 1614 else 1615 ip->i_d.di_extsize = 0; 1616 if (xfs_sb_version_has_v3inode(&mp->m_sb) && 1617 (ip->i_d.di_flags2 & XFS_DIFLAG2_COWEXTSIZE)) 1618 ip->i_d.di_cowextsize = fa->fsx_cowextsize >> 1619 mp->m_sb.sb_blocklog; 1620 else 1621 ip->i_d.di_cowextsize = 0; 1622 1623 code = xfs_trans_commit(tp); 1624 1625 /* 1626 * Release any dquot(s) the inode had kept before chown. 1627 */ 1628 xfs_qm_dqrele(olddquot); 1629 xfs_qm_dqrele(udqp); 1630 xfs_qm_dqrele(pdqp); 1631 1632 return code; 1633 1634 error_trans_cancel: 1635 xfs_trans_cancel(tp); 1636 error_free_dquots: 1637 xfs_qm_dqrele(udqp); 1638 xfs_qm_dqrele(pdqp); 1639 return code; 1640 } 1641 1642 STATIC int 1643 xfs_ioc_fssetxattr( 1644 xfs_inode_t *ip, 1645 struct file *filp, 1646 void __user *arg) 1647 { 1648 struct fsxattr fa; 1649 int error; 1650 1651 if (copy_from_user(&fa, arg, sizeof(fa))) 1652 return -EFAULT; 1653 1654 error = mnt_want_write_file(filp); 1655 if (error) 1656 return error; 1657 error = xfs_ioctl_setattr(ip, &fa); 1658 mnt_drop_write_file(filp); 1659 return error; 1660 } 1661 1662 STATIC int 1663 xfs_ioc_getxflags( 1664 xfs_inode_t *ip, 1665 void __user *arg) 1666 { 1667 unsigned int flags; 1668 1669 flags = xfs_di2lxflags(ip->i_d.di_flags); 1670 if (copy_to_user(arg, &flags, sizeof(flags))) 1671 return -EFAULT; 1672 return 0; 1673 } 1674 1675 STATIC int 1676 xfs_ioc_setxflags( 1677 struct xfs_inode *ip, 1678 struct file *filp, 1679 void __user *arg) 1680 { 1681 struct xfs_trans *tp; 1682 struct fsxattr fa; 1683 struct fsxattr old_fa; 1684 unsigned int flags; 1685 int join_flags = 0; 1686 int error; 1687 1688 if (copy_from_user(&flags, arg, sizeof(flags))) 1689 return -EFAULT; 1690 1691 if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 1692 FS_NOATIME_FL | FS_NODUMP_FL | \ 1693 FS_SYNC_FL)) 1694 return -EOPNOTSUPP; 1695 1696 fa.fsx_xflags = xfs_merge_ioc_xflags(flags, xfs_ip2xflags(ip)); 1697 1698 error = mnt_want_write_file(filp); 1699 if (error) 1700 return error; 1701 1702 /* 1703 * Changing DAX config may require inode locking for mapping 1704 * invalidation. These need to be held all the way to transaction commit 1705 * or cancel time, so need to be passed through to 1706 * xfs_ioctl_setattr_get_trans() so it can apply them to the join call 1707 * appropriately. 1708 */ 1709 error = xfs_ioctl_setattr_dax_invalidate(ip, &fa, &join_flags); 1710 if (error) 1711 goto out_drop_write; 1712 1713 tp = xfs_ioctl_setattr_get_trans(ip, join_flags); 1714 if (IS_ERR(tp)) { 1715 error = PTR_ERR(tp); 1716 goto out_drop_write; 1717 } 1718 1719 xfs_fill_fsxattr(ip, false, &old_fa); 1720 error = vfs_ioc_fssetxattr_check(VFS_I(ip), &old_fa, &fa); 1721 if (error) { 1722 xfs_trans_cancel(tp); 1723 goto out_drop_write; 1724 } 1725 1726 error = xfs_ioctl_setattr_xflags(tp, ip, &fa); 1727 if (error) { 1728 xfs_trans_cancel(tp); 1729 goto out_drop_write; 1730 } 1731 1732 error = xfs_trans_commit(tp); 1733 out_drop_write: 1734 mnt_drop_write_file(filp); 1735 return error; 1736 } 1737 1738 static bool 1739 xfs_getbmap_format( 1740 struct kgetbmap *p, 1741 struct getbmapx __user *u, 1742 size_t recsize) 1743 { 1744 if (put_user(p->bmv_offset, &u->bmv_offset) || 1745 put_user(p->bmv_block, &u->bmv_block) || 1746 put_user(p->bmv_length, &u->bmv_length) || 1747 put_user(0, &u->bmv_count) || 1748 put_user(0, &u->bmv_entries)) 1749 return false; 1750 if (recsize < sizeof(struct getbmapx)) 1751 return true; 1752 if (put_user(0, &u->bmv_iflags) || 1753 put_user(p->bmv_oflags, &u->bmv_oflags) || 1754 put_user(0, &u->bmv_unused1) || 1755 put_user(0, &u->bmv_unused2)) 1756 return false; 1757 return true; 1758 } 1759 1760 STATIC int 1761 xfs_ioc_getbmap( 1762 struct file *file, 1763 unsigned int cmd, 1764 void __user *arg) 1765 { 1766 struct getbmapx bmx = { 0 }; 1767 struct kgetbmap *buf; 1768 size_t recsize; 1769 int error, i; 1770 1771 switch (cmd) { 1772 case XFS_IOC_GETBMAPA: 1773 bmx.bmv_iflags = BMV_IF_ATTRFORK; 1774 /*FALLTHRU*/ 1775 case XFS_IOC_GETBMAP: 1776 if (file->f_mode & FMODE_NOCMTIME) 1777 bmx.bmv_iflags |= BMV_IF_NO_DMAPI_READ; 1778 /* struct getbmap is a strict subset of struct getbmapx. */ 1779 recsize = sizeof(struct getbmap); 1780 break; 1781 case XFS_IOC_GETBMAPX: 1782 recsize = sizeof(struct getbmapx); 1783 break; 1784 default: 1785 return -EINVAL; 1786 } 1787 1788 if (copy_from_user(&bmx, arg, recsize)) 1789 return -EFAULT; 1790 1791 if (bmx.bmv_count < 2) 1792 return -EINVAL; 1793 if (bmx.bmv_count > ULONG_MAX / recsize) 1794 return -ENOMEM; 1795 1796 buf = kmem_zalloc_large(bmx.bmv_count * sizeof(*buf), 0); 1797 if (!buf) 1798 return -ENOMEM; 1799 1800 error = xfs_getbmap(XFS_I(file_inode(file)), &bmx, buf); 1801 if (error) 1802 goto out_free_buf; 1803 1804 error = -EFAULT; 1805 if (copy_to_user(arg, &bmx, recsize)) 1806 goto out_free_buf; 1807 arg += recsize; 1808 1809 for (i = 0; i < bmx.bmv_entries; i++) { 1810 if (!xfs_getbmap_format(buf + i, arg, recsize)) 1811 goto out_free_buf; 1812 arg += recsize; 1813 } 1814 1815 error = 0; 1816 out_free_buf: 1817 kmem_free(buf); 1818 return error; 1819 } 1820 1821 struct getfsmap_info { 1822 struct xfs_mount *mp; 1823 struct fsmap_head __user *data; 1824 unsigned int idx; 1825 __u32 last_flags; 1826 }; 1827 1828 STATIC int 1829 xfs_getfsmap_format(struct xfs_fsmap *xfm, void *priv) 1830 { 1831 struct getfsmap_info *info = priv; 1832 struct fsmap fm; 1833 1834 trace_xfs_getfsmap_mapping(info->mp, xfm); 1835 1836 info->last_flags = xfm->fmr_flags; 1837 xfs_fsmap_from_internal(&fm, xfm); 1838 if (copy_to_user(&info->data->fmh_recs[info->idx++], &fm, 1839 sizeof(struct fsmap))) 1840 return -EFAULT; 1841 1842 return 0; 1843 } 1844 1845 STATIC int 1846 xfs_ioc_getfsmap( 1847 struct xfs_inode *ip, 1848 struct fsmap_head __user *arg) 1849 { 1850 struct getfsmap_info info = { NULL }; 1851 struct xfs_fsmap_head xhead = {0}; 1852 struct fsmap_head head; 1853 bool aborted = false; 1854 int error; 1855 1856 if (copy_from_user(&head, arg, sizeof(struct fsmap_head))) 1857 return -EFAULT; 1858 if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) || 1859 memchr_inv(head.fmh_keys[0].fmr_reserved, 0, 1860 sizeof(head.fmh_keys[0].fmr_reserved)) || 1861 memchr_inv(head.fmh_keys[1].fmr_reserved, 0, 1862 sizeof(head.fmh_keys[1].fmr_reserved))) 1863 return -EINVAL; 1864 1865 xhead.fmh_iflags = head.fmh_iflags; 1866 xhead.fmh_count = head.fmh_count; 1867 xfs_fsmap_to_internal(&xhead.fmh_keys[0], &head.fmh_keys[0]); 1868 xfs_fsmap_to_internal(&xhead.fmh_keys[1], &head.fmh_keys[1]); 1869 1870 trace_xfs_getfsmap_low_key(ip->i_mount, &xhead.fmh_keys[0]); 1871 trace_xfs_getfsmap_high_key(ip->i_mount, &xhead.fmh_keys[1]); 1872 1873 info.mp = ip->i_mount; 1874 info.data = arg; 1875 error = xfs_getfsmap(ip->i_mount, &xhead, xfs_getfsmap_format, &info); 1876 if (error == -ECANCELED) { 1877 error = 0; 1878 aborted = true; 1879 } else if (error) 1880 return error; 1881 1882 /* If we didn't abort, set the "last" flag in the last fmx */ 1883 if (!aborted && info.idx) { 1884 info.last_flags |= FMR_OF_LAST; 1885 if (copy_to_user(&info.data->fmh_recs[info.idx - 1].fmr_flags, 1886 &info.last_flags, sizeof(info.last_flags))) 1887 return -EFAULT; 1888 } 1889 1890 /* copy back header */ 1891 head.fmh_entries = xhead.fmh_entries; 1892 head.fmh_oflags = xhead.fmh_oflags; 1893 if (copy_to_user(arg, &head, sizeof(struct fsmap_head))) 1894 return -EFAULT; 1895 1896 return 0; 1897 } 1898 1899 STATIC int 1900 xfs_ioc_scrub_metadata( 1901 struct xfs_inode *ip, 1902 void __user *arg) 1903 { 1904 struct xfs_scrub_metadata scrub; 1905 int error; 1906 1907 if (!capable(CAP_SYS_ADMIN)) 1908 return -EPERM; 1909 1910 if (copy_from_user(&scrub, arg, sizeof(scrub))) 1911 return -EFAULT; 1912 1913 error = xfs_scrub_metadata(ip, &scrub); 1914 if (error) 1915 return error; 1916 1917 if (copy_to_user(arg, &scrub, sizeof(scrub))) 1918 return -EFAULT; 1919 1920 return 0; 1921 } 1922 1923 int 1924 xfs_ioc_swapext( 1925 xfs_swapext_t *sxp) 1926 { 1927 xfs_inode_t *ip, *tip; 1928 struct fd f, tmp; 1929 int error = 0; 1930 1931 /* Pull information for the target fd */ 1932 f = fdget((int)sxp->sx_fdtarget); 1933 if (!f.file) { 1934 error = -EINVAL; 1935 goto out; 1936 } 1937 1938 if (!(f.file->f_mode & FMODE_WRITE) || 1939 !(f.file->f_mode & FMODE_READ) || 1940 (f.file->f_flags & O_APPEND)) { 1941 error = -EBADF; 1942 goto out_put_file; 1943 } 1944 1945 tmp = fdget((int)sxp->sx_fdtmp); 1946 if (!tmp.file) { 1947 error = -EINVAL; 1948 goto out_put_file; 1949 } 1950 1951 if (!(tmp.file->f_mode & FMODE_WRITE) || 1952 !(tmp.file->f_mode & FMODE_READ) || 1953 (tmp.file->f_flags & O_APPEND)) { 1954 error = -EBADF; 1955 goto out_put_tmp_file; 1956 } 1957 1958 if (IS_SWAPFILE(file_inode(f.file)) || 1959 IS_SWAPFILE(file_inode(tmp.file))) { 1960 error = -EINVAL; 1961 goto out_put_tmp_file; 1962 } 1963 1964 /* 1965 * We need to ensure that the fds passed in point to XFS inodes 1966 * before we cast and access them as XFS structures as we have no 1967 * control over what the user passes us here. 1968 */ 1969 if (f.file->f_op != &xfs_file_operations || 1970 tmp.file->f_op != &xfs_file_operations) { 1971 error = -EINVAL; 1972 goto out_put_tmp_file; 1973 } 1974 1975 ip = XFS_I(file_inode(f.file)); 1976 tip = XFS_I(file_inode(tmp.file)); 1977 1978 if (ip->i_mount != tip->i_mount) { 1979 error = -EINVAL; 1980 goto out_put_tmp_file; 1981 } 1982 1983 if (ip->i_ino == tip->i_ino) { 1984 error = -EINVAL; 1985 goto out_put_tmp_file; 1986 } 1987 1988 if (XFS_FORCED_SHUTDOWN(ip->i_mount)) { 1989 error = -EIO; 1990 goto out_put_tmp_file; 1991 } 1992 1993 error = xfs_swap_extents(ip, tip, sxp); 1994 1995 out_put_tmp_file: 1996 fdput(tmp); 1997 out_put_file: 1998 fdput(f); 1999 out: 2000 return error; 2001 } 2002 2003 static int 2004 xfs_ioc_getlabel( 2005 struct xfs_mount *mp, 2006 char __user *user_label) 2007 { 2008 struct xfs_sb *sbp = &mp->m_sb; 2009 char label[XFSLABEL_MAX + 1]; 2010 2011 /* Paranoia */ 2012 BUILD_BUG_ON(sizeof(sbp->sb_fname) > FSLABEL_MAX); 2013 2014 /* 1 larger than sb_fname, so this ensures a trailing NUL char */ 2015 memset(label, 0, sizeof(label)); 2016 spin_lock(&mp->m_sb_lock); 2017 strncpy(label, sbp->sb_fname, XFSLABEL_MAX); 2018 spin_unlock(&mp->m_sb_lock); 2019 2020 if (copy_to_user(user_label, label, sizeof(label))) 2021 return -EFAULT; 2022 return 0; 2023 } 2024 2025 static int 2026 xfs_ioc_setlabel( 2027 struct file *filp, 2028 struct xfs_mount *mp, 2029 char __user *newlabel) 2030 { 2031 struct xfs_sb *sbp = &mp->m_sb; 2032 char label[XFSLABEL_MAX + 1]; 2033 size_t len; 2034 int error; 2035 2036 if (!capable(CAP_SYS_ADMIN)) 2037 return -EPERM; 2038 /* 2039 * The generic ioctl allows up to FSLABEL_MAX chars, but XFS is much 2040 * smaller, at 12 bytes. We copy one more to be sure we find the 2041 * (required) NULL character to test the incoming label length. 2042 * NB: The on disk label doesn't need to be null terminated. 2043 */ 2044 if (copy_from_user(label, newlabel, XFSLABEL_MAX + 1)) 2045 return -EFAULT; 2046 len = strnlen(label, XFSLABEL_MAX + 1); 2047 if (len > sizeof(sbp->sb_fname)) 2048 return -EINVAL; 2049 2050 error = mnt_want_write_file(filp); 2051 if (error) 2052 return error; 2053 2054 spin_lock(&mp->m_sb_lock); 2055 memset(sbp->sb_fname, 0, sizeof(sbp->sb_fname)); 2056 memcpy(sbp->sb_fname, label, len); 2057 spin_unlock(&mp->m_sb_lock); 2058 2059 /* 2060 * Now we do several things to satisfy userspace. 2061 * In addition to normal logging of the primary superblock, we also 2062 * immediately write these changes to sector zero for the primary, then 2063 * update all backup supers (as xfs_db does for a label change), then 2064 * invalidate the block device page cache. This is so that any prior 2065 * buffered reads from userspace (i.e. from blkid) are invalidated, 2066 * and userspace will see the newly-written label. 2067 */ 2068 error = xfs_sync_sb_buf(mp); 2069 if (error) 2070 goto out; 2071 /* 2072 * growfs also updates backup supers so lock against that. 2073 */ 2074 mutex_lock(&mp->m_growlock); 2075 error = xfs_update_secondary_sbs(mp); 2076 mutex_unlock(&mp->m_growlock); 2077 2078 invalidate_bdev(mp->m_ddev_targp->bt_bdev); 2079 2080 out: 2081 mnt_drop_write_file(filp); 2082 return error; 2083 } 2084 2085 /* 2086 * Note: some of the ioctl's return positive numbers as a 2087 * byte count indicating success, such as readlink_by_handle. 2088 * So we don't "sign flip" like most other routines. This means 2089 * true errors need to be returned as a negative value. 2090 */ 2091 long 2092 xfs_file_ioctl( 2093 struct file *filp, 2094 unsigned int cmd, 2095 unsigned long p) 2096 { 2097 struct inode *inode = file_inode(filp); 2098 struct xfs_inode *ip = XFS_I(inode); 2099 struct xfs_mount *mp = ip->i_mount; 2100 void __user *arg = (void __user *)p; 2101 int error; 2102 2103 trace_xfs_file_ioctl(ip); 2104 2105 switch (cmd) { 2106 case FITRIM: 2107 return xfs_ioc_trim(mp, arg); 2108 case FS_IOC_GETFSLABEL: 2109 return xfs_ioc_getlabel(mp, arg); 2110 case FS_IOC_SETFSLABEL: 2111 return xfs_ioc_setlabel(filp, mp, arg); 2112 case XFS_IOC_ALLOCSP: 2113 case XFS_IOC_FREESP: 2114 case XFS_IOC_ALLOCSP64: 2115 case XFS_IOC_FREESP64: { 2116 xfs_flock64_t bf; 2117 2118 if (copy_from_user(&bf, arg, sizeof(bf))) 2119 return -EFAULT; 2120 return xfs_ioc_space(filp, &bf); 2121 } 2122 case XFS_IOC_DIOINFO: { 2123 struct xfs_buftarg *target = xfs_inode_buftarg(ip); 2124 struct dioattr da; 2125 2126 da.d_mem = da.d_miniosz = target->bt_logical_sectorsize; 2127 da.d_maxiosz = INT_MAX & ~(da.d_miniosz - 1); 2128 2129 if (copy_to_user(arg, &da, sizeof(da))) 2130 return -EFAULT; 2131 return 0; 2132 } 2133 2134 case XFS_IOC_FSBULKSTAT_SINGLE: 2135 case XFS_IOC_FSBULKSTAT: 2136 case XFS_IOC_FSINUMBERS: 2137 return xfs_ioc_fsbulkstat(mp, cmd, arg); 2138 2139 case XFS_IOC_BULKSTAT: 2140 return xfs_ioc_bulkstat(mp, cmd, arg); 2141 case XFS_IOC_INUMBERS: 2142 return xfs_ioc_inumbers(mp, cmd, arg); 2143 2144 case XFS_IOC_FSGEOMETRY_V1: 2145 return xfs_ioc_fsgeometry(mp, arg, 3); 2146 case XFS_IOC_FSGEOMETRY_V4: 2147 return xfs_ioc_fsgeometry(mp, arg, 4); 2148 case XFS_IOC_FSGEOMETRY: 2149 return xfs_ioc_fsgeometry(mp, arg, 5); 2150 2151 case XFS_IOC_AG_GEOMETRY: 2152 return xfs_ioc_ag_geometry(mp, arg); 2153 2154 case XFS_IOC_GETVERSION: 2155 return put_user(inode->i_generation, (int __user *)arg); 2156 2157 case XFS_IOC_FSGETXATTR: 2158 return xfs_ioc_fsgetxattr(ip, 0, arg); 2159 case XFS_IOC_FSGETXATTRA: 2160 return xfs_ioc_fsgetxattr(ip, 1, arg); 2161 case XFS_IOC_FSSETXATTR: 2162 return xfs_ioc_fssetxattr(ip, filp, arg); 2163 case XFS_IOC_GETXFLAGS: 2164 return xfs_ioc_getxflags(ip, arg); 2165 case XFS_IOC_SETXFLAGS: 2166 return xfs_ioc_setxflags(ip, filp, arg); 2167 2168 case XFS_IOC_GETBMAP: 2169 case XFS_IOC_GETBMAPA: 2170 case XFS_IOC_GETBMAPX: 2171 return xfs_ioc_getbmap(filp, cmd, arg); 2172 2173 case FS_IOC_GETFSMAP: 2174 return xfs_ioc_getfsmap(ip, arg); 2175 2176 case XFS_IOC_SCRUB_METADATA: 2177 return xfs_ioc_scrub_metadata(ip, arg); 2178 2179 case XFS_IOC_FD_TO_HANDLE: 2180 case XFS_IOC_PATH_TO_HANDLE: 2181 case XFS_IOC_PATH_TO_FSHANDLE: { 2182 xfs_fsop_handlereq_t hreq; 2183 2184 if (copy_from_user(&hreq, arg, sizeof(hreq))) 2185 return -EFAULT; 2186 return xfs_find_handle(cmd, &hreq); 2187 } 2188 case XFS_IOC_OPEN_BY_HANDLE: { 2189 xfs_fsop_handlereq_t hreq; 2190 2191 if (copy_from_user(&hreq, arg, sizeof(xfs_fsop_handlereq_t))) 2192 return -EFAULT; 2193 return xfs_open_by_handle(filp, &hreq); 2194 } 2195 2196 case XFS_IOC_READLINK_BY_HANDLE: { 2197 xfs_fsop_handlereq_t hreq; 2198 2199 if (copy_from_user(&hreq, arg, sizeof(xfs_fsop_handlereq_t))) 2200 return -EFAULT; 2201 return xfs_readlink_by_handle(filp, &hreq); 2202 } 2203 case XFS_IOC_ATTRLIST_BY_HANDLE: 2204 return xfs_attrlist_by_handle(filp, arg); 2205 2206 case XFS_IOC_ATTRMULTI_BY_HANDLE: 2207 return xfs_attrmulti_by_handle(filp, arg); 2208 2209 case XFS_IOC_SWAPEXT: { 2210 struct xfs_swapext sxp; 2211 2212 if (copy_from_user(&sxp, arg, sizeof(xfs_swapext_t))) 2213 return -EFAULT; 2214 error = mnt_want_write_file(filp); 2215 if (error) 2216 return error; 2217 error = xfs_ioc_swapext(&sxp); 2218 mnt_drop_write_file(filp); 2219 return error; 2220 } 2221 2222 case XFS_IOC_FSCOUNTS: { 2223 xfs_fsop_counts_t out; 2224 2225 xfs_fs_counts(mp, &out); 2226 2227 if (copy_to_user(arg, &out, sizeof(out))) 2228 return -EFAULT; 2229 return 0; 2230 } 2231 2232 case XFS_IOC_SET_RESBLKS: { 2233 xfs_fsop_resblks_t inout; 2234 uint64_t in; 2235 2236 if (!capable(CAP_SYS_ADMIN)) 2237 return -EPERM; 2238 2239 if (mp->m_flags & XFS_MOUNT_RDONLY) 2240 return -EROFS; 2241 2242 if (copy_from_user(&inout, arg, sizeof(inout))) 2243 return -EFAULT; 2244 2245 error = mnt_want_write_file(filp); 2246 if (error) 2247 return error; 2248 2249 /* input parameter is passed in resblks field of structure */ 2250 in = inout.resblks; 2251 error = xfs_reserve_blocks(mp, &in, &inout); 2252 mnt_drop_write_file(filp); 2253 if (error) 2254 return error; 2255 2256 if (copy_to_user(arg, &inout, sizeof(inout))) 2257 return -EFAULT; 2258 return 0; 2259 } 2260 2261 case XFS_IOC_GET_RESBLKS: { 2262 xfs_fsop_resblks_t out; 2263 2264 if (!capable(CAP_SYS_ADMIN)) 2265 return -EPERM; 2266 2267 error = xfs_reserve_blocks(mp, NULL, &out); 2268 if (error) 2269 return error; 2270 2271 if (copy_to_user(arg, &out, sizeof(out))) 2272 return -EFAULT; 2273 2274 return 0; 2275 } 2276 2277 case XFS_IOC_FSGROWFSDATA: { 2278 xfs_growfs_data_t in; 2279 2280 if (copy_from_user(&in, arg, sizeof(in))) 2281 return -EFAULT; 2282 2283 error = mnt_want_write_file(filp); 2284 if (error) 2285 return error; 2286 error = xfs_growfs_data(mp, &in); 2287 mnt_drop_write_file(filp); 2288 return error; 2289 } 2290 2291 case XFS_IOC_FSGROWFSLOG: { 2292 xfs_growfs_log_t in; 2293 2294 if (copy_from_user(&in, arg, sizeof(in))) 2295 return -EFAULT; 2296 2297 error = mnt_want_write_file(filp); 2298 if (error) 2299 return error; 2300 error = xfs_growfs_log(mp, &in); 2301 mnt_drop_write_file(filp); 2302 return error; 2303 } 2304 2305 case XFS_IOC_FSGROWFSRT: { 2306 xfs_growfs_rt_t in; 2307 2308 if (copy_from_user(&in, arg, sizeof(in))) 2309 return -EFAULT; 2310 2311 error = mnt_want_write_file(filp); 2312 if (error) 2313 return error; 2314 error = xfs_growfs_rt(mp, &in); 2315 mnt_drop_write_file(filp); 2316 return error; 2317 } 2318 2319 case XFS_IOC_GOINGDOWN: { 2320 uint32_t in; 2321 2322 if (!capable(CAP_SYS_ADMIN)) 2323 return -EPERM; 2324 2325 if (get_user(in, (uint32_t __user *)arg)) 2326 return -EFAULT; 2327 2328 return xfs_fs_goingdown(mp, in); 2329 } 2330 2331 case XFS_IOC_ERROR_INJECTION: { 2332 xfs_error_injection_t in; 2333 2334 if (!capable(CAP_SYS_ADMIN)) 2335 return -EPERM; 2336 2337 if (copy_from_user(&in, arg, sizeof(in))) 2338 return -EFAULT; 2339 2340 return xfs_errortag_add(mp, in.errtag); 2341 } 2342 2343 case XFS_IOC_ERROR_CLEARALL: 2344 if (!capable(CAP_SYS_ADMIN)) 2345 return -EPERM; 2346 2347 return xfs_errortag_clearall(mp); 2348 2349 case XFS_IOC_FREE_EOFBLOCKS: { 2350 struct xfs_fs_eofblocks eofb; 2351 struct xfs_eofblocks keofb; 2352 2353 if (!capable(CAP_SYS_ADMIN)) 2354 return -EPERM; 2355 2356 if (mp->m_flags & XFS_MOUNT_RDONLY) 2357 return -EROFS; 2358 2359 if (copy_from_user(&eofb, arg, sizeof(eofb))) 2360 return -EFAULT; 2361 2362 error = xfs_fs_eofblocks_from_user(&eofb, &keofb); 2363 if (error) 2364 return error; 2365 2366 sb_start_write(mp->m_super); 2367 error = xfs_icache_free_eofblocks(mp, &keofb); 2368 sb_end_write(mp->m_super); 2369 return error; 2370 } 2371 2372 default: 2373 return -ENOTTY; 2374 } 2375 } 2376