1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * 4 * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved. 5 * 6 * 7 * terminology 8 * 9 * cluster - allocation unit - 512,1K,2K,4K,...,2M 10 * vcn - virtual cluster number - Offset inside the file in clusters. 11 * vbo - virtual byte offset - Offset inside the file in bytes. 12 * lcn - logical cluster number - 0 based cluster in clusters heap. 13 * lbo - logical byte offset - Absolute position inside volume. 14 * run - maps VCN to LCN - Stored in attributes in packed form. 15 * attr - attribute segment - std/name/data etc records inside MFT. 16 * mi - MFT inode - One MFT record(usually 1024 bytes or 4K), consists of attributes. 17 * ni - NTFS inode - Extends linux inode. consists of one or more mft inodes. 18 * index - unit inside directory - 2K, 4K, <=page size, does not depend on cluster size. 19 * 20 * WSL - Windows Subsystem for Linux 21 * https://docs.microsoft.com/en-us/windows/wsl/file-permissions 22 * It stores uid/gid/mode/dev in xattr 23 * 24 * ntfs allows up to 2^64 clusters per volume. 25 * It means you should use 64 bits lcn to operate with ntfs. 26 * Implementation of ntfs.sys uses only 32 bits lcn. 27 * Default ntfs3 uses 32 bits lcn too. 28 * ntfs3 built with CONFIG_NTFS3_64BIT_CLUSTER (ntfs3_64) uses 64 bits per lcn. 29 * 30 * 31 * ntfs limits, cluster size is 4K (2^12) 32 * ----------------------------------------------------------------------------- 33 * | Volume size | Clusters | ntfs.sys | ntfs3 | ntfs3_64 | mkntfs | chkdsk | 34 * ----------------------------------------------------------------------------- 35 * | < 16T, 2^44 | < 2^32 | yes | yes | yes | yes | yes | 36 * | > 16T, 2^44 | > 2^32 | no | no | yes | yes | yes | 37 * ----------------------------------------------------------|------------------ 38 * 39 * To mount large volumes as ntfs one should use large cluster size (up to 2M) 40 * The maximum volume size in this case is 2^32 * 2^21 = 2^53 = 8P 41 * 42 * ntfs limits, cluster size is 2M (2^21) 43 * ----------------------------------------------------------------------------- 44 * | < 8P, 2^53 | < 2^32 | yes | yes | yes | yes | yes | 45 * | > 8P, 2^53 | > 2^32 | no | no | yes | yes | yes | 46 * ----------------------------------------------------------|------------------ 47 * 48 */ 49 50 #include <linux/blkdev.h> 51 #include <linux/buffer_head.h> 52 #include <linux/exportfs.h> 53 #include <linux/fs.h> 54 #include <linux/fs_context.h> 55 #include <linux/fs_parser.h> 56 #include <linux/log2.h> 57 #include <linux/minmax.h> 58 #include <linux/module.h> 59 #include <linux/nls.h> 60 #include <linux/proc_fs.h> 61 #include <linux/seq_file.h> 62 #include <linux/statfs.h> 63 64 #include "debug.h" 65 #include "ntfs.h" 66 #include "ntfs_fs.h" 67 #ifdef CONFIG_NTFS3_LZX_XPRESS 68 #include "lib/lib.h" 69 #endif 70 71 #ifdef CONFIG_PRINTK 72 /* 73 * ntfs_printk - Trace warnings/notices/errors. 74 * 75 * Thanks Joe Perches <joe@perches.com> for implementation 76 */ 77 void ntfs_printk(const struct super_block *sb, const char *fmt, ...) 78 { 79 struct va_format vaf; 80 va_list args; 81 int level; 82 struct ntfs_sb_info *sbi = sb->s_fs_info; 83 84 /* Should we use different ratelimits for warnings/notices/errors? */ 85 if (!___ratelimit(&sbi->msg_ratelimit, "ntfs3")) 86 return; 87 88 va_start(args, fmt); 89 90 level = printk_get_level(fmt); 91 vaf.fmt = printk_skip_level(fmt); 92 vaf.va = &args; 93 printk("%c%cntfs3: %s: %pV\n", KERN_SOH_ASCII, level, sb->s_id, &vaf); 94 95 va_end(args); 96 } 97 98 static char s_name_buf[512]; 99 static atomic_t s_name_buf_cnt = ATOMIC_INIT(1); // 1 means 'free s_name_buf'. 100 101 /* 102 * ntfs_inode_printk 103 * 104 * Print warnings/notices/errors about inode using name or inode number. 105 */ 106 void ntfs_inode_printk(struct inode *inode, const char *fmt, ...) 107 { 108 struct super_block *sb = inode->i_sb; 109 struct ntfs_sb_info *sbi = sb->s_fs_info; 110 char *name; 111 va_list args; 112 struct va_format vaf; 113 int level; 114 115 if (!___ratelimit(&sbi->msg_ratelimit, "ntfs3")) 116 return; 117 118 /* Use static allocated buffer, if possible. */ 119 name = atomic_dec_and_test(&s_name_buf_cnt) ? 120 s_name_buf : 121 kmalloc(sizeof(s_name_buf), GFP_NOFS); 122 123 if (name) { 124 struct dentry *de = d_find_alias(inode); 125 const u32 name_len = ARRAY_SIZE(s_name_buf) - 1; 126 127 if (de) { 128 spin_lock(&de->d_lock); 129 snprintf(name, name_len, " \"%s\"", de->d_name.name); 130 spin_unlock(&de->d_lock); 131 name[name_len] = 0; /* To be sure. */ 132 } else { 133 name[0] = 0; 134 } 135 dput(de); /* Cocci warns if placed in branch "if (de)" */ 136 } 137 138 va_start(args, fmt); 139 140 level = printk_get_level(fmt); 141 vaf.fmt = printk_skip_level(fmt); 142 vaf.va = &args; 143 144 printk("%c%cntfs3: %s: ino=%lx,%s %pV\n", KERN_SOH_ASCII, level, 145 sb->s_id, inode->i_ino, name ? name : "", &vaf); 146 147 va_end(args); 148 149 atomic_inc(&s_name_buf_cnt); 150 if (name != s_name_buf) 151 kfree(name); 152 } 153 #endif 154 155 /* 156 * Shared memory struct. 157 * 158 * On-disk ntfs's upcase table is created by ntfs formatter. 159 * 'upcase' table is 128K bytes of memory. 160 * We should read it into memory when mounting. 161 * Several ntfs volumes likely use the same 'upcase' table. 162 * It is good idea to share in-memory 'upcase' table between different volumes. 163 * Unfortunately winxp/vista/win7 use different upcase tables. 164 */ 165 static DEFINE_SPINLOCK(s_shared_lock); 166 167 static struct { 168 void *ptr; 169 u32 len; 170 int cnt; 171 } s_shared[8]; 172 173 /* 174 * ntfs_set_shared 175 * 176 * Return: 177 * * @ptr - If pointer was saved in shared memory. 178 * * NULL - If pointer was not shared. 179 */ 180 void *ntfs_set_shared(void *ptr, u32 bytes) 181 { 182 void *ret = NULL; 183 int i, j = -1; 184 185 spin_lock(&s_shared_lock); 186 for (i = 0; i < ARRAY_SIZE(s_shared); i++) { 187 if (!s_shared[i].cnt) { 188 j = i; 189 } else if (bytes == s_shared[i].len && 190 !memcmp(s_shared[i].ptr, ptr, bytes)) { 191 s_shared[i].cnt += 1; 192 ret = s_shared[i].ptr; 193 break; 194 } 195 } 196 197 if (!ret && j != -1) { 198 s_shared[j].ptr = ptr; 199 s_shared[j].len = bytes; 200 s_shared[j].cnt = 1; 201 ret = ptr; 202 } 203 spin_unlock(&s_shared_lock); 204 205 return ret; 206 } 207 208 /* 209 * ntfs_put_shared 210 * 211 * Return: 212 * * @ptr - If pointer is not shared anymore. 213 * * NULL - If pointer is still shared. 214 */ 215 void *ntfs_put_shared(void *ptr) 216 { 217 void *ret = ptr; 218 int i; 219 220 spin_lock(&s_shared_lock); 221 for (i = 0; i < ARRAY_SIZE(s_shared); i++) { 222 if (s_shared[i].cnt && s_shared[i].ptr == ptr) { 223 if (--s_shared[i].cnt) 224 ret = NULL; 225 break; 226 } 227 } 228 spin_unlock(&s_shared_lock); 229 230 return ret; 231 } 232 233 static inline void put_mount_options(struct ntfs_mount_options *options) 234 { 235 kfree(options->nls_name); 236 unload_nls(options->nls); 237 kfree(options); 238 } 239 240 enum Opt { 241 Opt_uid, 242 Opt_gid, 243 Opt_umask, 244 Opt_dmask, 245 Opt_fmask, 246 Opt_immutable, 247 Opt_discard, 248 Opt_force, 249 Opt_sparse, 250 Opt_nohidden, 251 Opt_hide_dot_files, 252 Opt_windows_names, 253 Opt_showmeta, 254 Opt_acl, 255 Opt_iocharset, 256 Opt_prealloc, 257 Opt_nocase, 258 Opt_err, 259 }; 260 261 // clang-format off 262 static const struct fs_parameter_spec ntfs_fs_parameters[] = { 263 fsparam_u32("uid", Opt_uid), 264 fsparam_u32("gid", Opt_gid), 265 fsparam_u32oct("umask", Opt_umask), 266 fsparam_u32oct("dmask", Opt_dmask), 267 fsparam_u32oct("fmask", Opt_fmask), 268 fsparam_flag_no("sys_immutable", Opt_immutable), 269 fsparam_flag_no("discard", Opt_discard), 270 fsparam_flag_no("force", Opt_force), 271 fsparam_flag_no("sparse", Opt_sparse), 272 fsparam_flag_no("hidden", Opt_nohidden), 273 fsparam_flag_no("hide_dot_files", Opt_hide_dot_files), 274 fsparam_flag_no("windows_names", Opt_windows_names), 275 fsparam_flag_no("showmeta", Opt_showmeta), 276 fsparam_flag_no("acl", Opt_acl), 277 fsparam_string("iocharset", Opt_iocharset), 278 fsparam_flag_no("prealloc", Opt_prealloc), 279 fsparam_flag_no("nocase", Opt_nocase), 280 {} 281 }; 282 // clang-format on 283 284 /* 285 * Load nls table or if @nls is utf8 then return NULL. 286 * 287 * It is good idea to use here "const char *nls". 288 * But load_nls accepts "char*". 289 */ 290 static struct nls_table *ntfs_load_nls(char *nls) 291 { 292 struct nls_table *ret; 293 294 if (!nls) 295 nls = CONFIG_NLS_DEFAULT; 296 297 if (strcmp(nls, "utf8") == 0) 298 return NULL; 299 300 if (strcmp(nls, CONFIG_NLS_DEFAULT) == 0) 301 return load_nls_default(); 302 303 ret = load_nls(nls); 304 if (ret) 305 return ret; 306 307 return ERR_PTR(-EINVAL); 308 } 309 310 static int ntfs_fs_parse_param(struct fs_context *fc, 311 struct fs_parameter *param) 312 { 313 struct ntfs_mount_options *opts = fc->fs_private; 314 struct fs_parse_result result; 315 int opt; 316 317 opt = fs_parse(fc, ntfs_fs_parameters, param, &result); 318 if (opt < 0) 319 return opt; 320 321 switch (opt) { 322 case Opt_uid: 323 opts->fs_uid = make_kuid(current_user_ns(), result.uint_32); 324 if (!uid_valid(opts->fs_uid)) 325 return invalf(fc, "ntfs3: Invalid value for uid."); 326 break; 327 case Opt_gid: 328 opts->fs_gid = make_kgid(current_user_ns(), result.uint_32); 329 if (!gid_valid(opts->fs_gid)) 330 return invalf(fc, "ntfs3: Invalid value for gid."); 331 break; 332 case Opt_umask: 333 if (result.uint_32 & ~07777) 334 return invalf(fc, "ntfs3: Invalid value for umask."); 335 opts->fs_fmask_inv = ~result.uint_32; 336 opts->fs_dmask_inv = ~result.uint_32; 337 opts->fmask = 1; 338 opts->dmask = 1; 339 break; 340 case Opt_dmask: 341 if (result.uint_32 & ~07777) 342 return invalf(fc, "ntfs3: Invalid value for dmask."); 343 opts->fs_dmask_inv = ~result.uint_32; 344 opts->dmask = 1; 345 break; 346 case Opt_fmask: 347 if (result.uint_32 & ~07777) 348 return invalf(fc, "ntfs3: Invalid value for fmask."); 349 opts->fs_fmask_inv = ~result.uint_32; 350 opts->fmask = 1; 351 break; 352 case Opt_immutable: 353 opts->sys_immutable = result.negated ? 0 : 1; 354 break; 355 case Opt_discard: 356 opts->discard = result.negated ? 0 : 1; 357 break; 358 case Opt_force: 359 opts->force = result.negated ? 0 : 1; 360 break; 361 case Opt_sparse: 362 opts->sparse = result.negated ? 0 : 1; 363 break; 364 case Opt_nohidden: 365 opts->nohidden = result.negated ? 1 : 0; 366 break; 367 case Opt_hide_dot_files: 368 opts->hide_dot_files = result.negated ? 0 : 1; 369 break; 370 case Opt_windows_names: 371 opts->windows_names = result.negated ? 0 : 1; 372 break; 373 case Opt_showmeta: 374 opts->showmeta = result.negated ? 0 : 1; 375 break; 376 case Opt_acl: 377 if (!result.negated) 378 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 379 fc->sb_flags |= SB_POSIXACL; 380 #else 381 return invalf( 382 fc, "ntfs3: Support for ACL not compiled in!"); 383 #endif 384 else 385 fc->sb_flags &= ~SB_POSIXACL; 386 break; 387 case Opt_iocharset: 388 kfree(opts->nls_name); 389 opts->nls_name = param->string; 390 param->string = NULL; 391 break; 392 case Opt_prealloc: 393 opts->prealloc = result.negated ? 0 : 1; 394 break; 395 case Opt_nocase: 396 opts->nocase = result.negated ? 1 : 0; 397 break; 398 default: 399 /* Should not be here unless we forget add case. */ 400 return -EINVAL; 401 } 402 return 0; 403 } 404 405 static int ntfs_fs_reconfigure(struct fs_context *fc) 406 { 407 struct super_block *sb = fc->root->d_sb; 408 struct ntfs_sb_info *sbi = sb->s_fs_info; 409 struct ntfs_mount_options *new_opts = fc->fs_private; 410 int ro_rw; 411 412 ro_rw = sb_rdonly(sb) && !(fc->sb_flags & SB_RDONLY); 413 if (ro_rw && (sbi->flags & NTFS_FLAGS_NEED_REPLAY)) { 414 errorf(fc, 415 "ntfs3: Couldn't remount rw because journal is not replayed. Please umount/remount instead\n"); 416 return -EINVAL; 417 } 418 419 new_opts->nls = ntfs_load_nls(new_opts->nls_name); 420 if (IS_ERR(new_opts->nls)) { 421 new_opts->nls = NULL; 422 errorf(fc, "ntfs3: Cannot load iocharset %s", 423 new_opts->nls_name); 424 return -EINVAL; 425 } 426 if (new_opts->nls != sbi->options->nls) 427 return invalf( 428 fc, 429 "ntfs3: Cannot use different iocharset when remounting!"); 430 431 sync_filesystem(sb); 432 433 if (ro_rw && (sbi->volume.flags & VOLUME_FLAG_DIRTY) && 434 !new_opts->force) { 435 errorf(fc, 436 "ntfs3: Volume is dirty and \"force\" flag is not set!"); 437 return -EINVAL; 438 } 439 440 swap(sbi->options, fc->fs_private); 441 442 return 0; 443 } 444 445 #ifdef CONFIG_PROC_FS 446 static struct proc_dir_entry *proc_info_root; 447 448 /* 449 * ntfs3_volinfo: 450 * 451 * The content of /proc/fs/ntfs3/<dev>/volinfo 452 * 453 * ntfs3.1 454 * cluster size 455 * number of clusters 456 */ 457 static int ntfs3_volinfo(struct seq_file *m, void *o) 458 { 459 struct super_block *sb = m->private; 460 struct ntfs_sb_info *sbi = sb->s_fs_info; 461 462 seq_printf(m, "ntfs%d.%d\n%u\n%zu\n", sbi->volume.major_ver, 463 sbi->volume.minor_ver, sbi->cluster_size, 464 sbi->used.bitmap.nbits); 465 466 return 0; 467 } 468 469 static int ntfs3_volinfo_open(struct inode *inode, struct file *file) 470 { 471 return single_open(file, ntfs3_volinfo, pde_data(inode)); 472 } 473 474 /* read /proc/fs/ntfs3/<dev>/label */ 475 static int ntfs3_label_show(struct seq_file *m, void *o) 476 { 477 struct super_block *sb = m->private; 478 struct ntfs_sb_info *sbi = sb->s_fs_info; 479 480 seq_printf(m, "%s\n", sbi->volume.label); 481 482 return 0; 483 } 484 485 /* write /proc/fs/ntfs3/<dev>/label */ 486 static ssize_t ntfs3_label_write(struct file *file, const char __user *buffer, 487 size_t count, loff_t *ppos) 488 { 489 int err; 490 struct super_block *sb = pde_data(file_inode(file)); 491 struct ntfs_sb_info *sbi = sb->s_fs_info; 492 ssize_t ret = count; 493 u8 *label = kmalloc(count, GFP_NOFS); 494 495 if (!label) 496 return -ENOMEM; 497 498 if (copy_from_user(label, buffer, ret)) { 499 ret = -EFAULT; 500 goto out; 501 } 502 while (ret > 0 && label[ret - 1] == '\n') 503 ret -= 1; 504 505 err = ntfs_set_label(sbi, label, ret); 506 507 if (err < 0) { 508 ntfs_err(sb, "failed (%d) to write label", err); 509 ret = err; 510 goto out; 511 } 512 513 *ppos += count; 514 ret = count; 515 out: 516 kfree(label); 517 return ret; 518 } 519 520 static int ntfs3_label_open(struct inode *inode, struct file *file) 521 { 522 return single_open(file, ntfs3_label_show, pde_data(inode)); 523 } 524 525 static const struct proc_ops ntfs3_volinfo_fops = { 526 .proc_read = seq_read, 527 .proc_lseek = seq_lseek, 528 .proc_release = single_release, 529 .proc_open = ntfs3_volinfo_open, 530 }; 531 532 static const struct proc_ops ntfs3_label_fops = { 533 .proc_read = seq_read, 534 .proc_lseek = seq_lseek, 535 .proc_release = single_release, 536 .proc_open = ntfs3_label_open, 537 .proc_write = ntfs3_label_write, 538 }; 539 540 #endif 541 542 static struct kmem_cache *ntfs_inode_cachep; 543 544 static struct inode *ntfs_alloc_inode(struct super_block *sb) 545 { 546 struct ntfs_inode *ni = alloc_inode_sb(sb, ntfs_inode_cachep, GFP_NOFS); 547 548 if (!ni) 549 return NULL; 550 551 memset(ni, 0, offsetof(struct ntfs_inode, vfs_inode)); 552 mutex_init(&ni->ni_lock); 553 return &ni->vfs_inode; 554 } 555 556 static void ntfs_free_inode(struct inode *inode) 557 { 558 struct ntfs_inode *ni = ntfs_i(inode); 559 560 mutex_destroy(&ni->ni_lock); 561 kmem_cache_free(ntfs_inode_cachep, ni); 562 } 563 564 static void init_once(void *foo) 565 { 566 struct ntfs_inode *ni = foo; 567 568 inode_init_once(&ni->vfs_inode); 569 } 570 571 /* 572 * Noinline to reduce binary size. 573 */ 574 static noinline void ntfs3_free_sbi(struct ntfs_sb_info *sbi) 575 { 576 kfree(sbi->new_rec); 577 kvfree(ntfs_put_shared(sbi->upcase)); 578 kfree(sbi->def_table); 579 580 wnd_close(&sbi->mft.bitmap); 581 wnd_close(&sbi->used.bitmap); 582 583 if (sbi->mft.ni) 584 iput(&sbi->mft.ni->vfs_inode); 585 586 if (sbi->security.ni) 587 iput(&sbi->security.ni->vfs_inode); 588 589 if (sbi->reparse.ni) 590 iput(&sbi->reparse.ni->vfs_inode); 591 592 if (sbi->objid.ni) 593 iput(&sbi->objid.ni->vfs_inode); 594 595 if (sbi->volume.ni) 596 iput(&sbi->volume.ni->vfs_inode); 597 598 ntfs_update_mftmirr(sbi, 0); 599 600 indx_clear(&sbi->security.index_sii); 601 indx_clear(&sbi->security.index_sdh); 602 indx_clear(&sbi->reparse.index_r); 603 indx_clear(&sbi->objid.index_o); 604 kfree(sbi->compress.lznt); 605 #ifdef CONFIG_NTFS3_LZX_XPRESS 606 xpress_free_decompressor(sbi->compress.xpress); 607 lzx_free_decompressor(sbi->compress.lzx); 608 #endif 609 kfree(sbi); 610 } 611 612 static void ntfs_put_super(struct super_block *sb) 613 { 614 struct ntfs_sb_info *sbi = sb->s_fs_info; 615 616 #ifdef CONFIG_PROC_FS 617 // Remove /proc/fs/ntfs3/.. 618 if (sbi->procdir) { 619 remove_proc_entry("label", sbi->procdir); 620 remove_proc_entry("volinfo", sbi->procdir); 621 remove_proc_entry(sb->s_id, proc_info_root); 622 sbi->procdir = NULL; 623 } 624 #endif 625 626 /* Mark rw ntfs as clear, if possible. */ 627 ntfs_set_state(sbi, NTFS_DIRTY_CLEAR); 628 } 629 630 static int ntfs_statfs(struct dentry *dentry, struct kstatfs *buf) 631 { 632 struct super_block *sb = dentry->d_sb; 633 struct ntfs_sb_info *sbi = sb->s_fs_info; 634 struct wnd_bitmap *wnd = &sbi->used.bitmap; 635 636 buf->f_type = sb->s_magic; 637 buf->f_bsize = sbi->cluster_size; 638 buf->f_blocks = wnd->nbits; 639 640 buf->f_bfree = buf->f_bavail = wnd_zeroes(wnd); 641 buf->f_fsid.val[0] = sbi->volume.ser_num; 642 buf->f_fsid.val[1] = (sbi->volume.ser_num >> 32); 643 buf->f_namelen = NTFS_NAME_LEN; 644 645 return 0; 646 } 647 648 static int ntfs_show_options(struct seq_file *m, struct dentry *root) 649 { 650 struct super_block *sb = root->d_sb; 651 struct ntfs_sb_info *sbi = sb->s_fs_info; 652 struct ntfs_mount_options *opts = sbi->options; 653 struct user_namespace *user_ns = seq_user_ns(m); 654 655 seq_printf(m, ",uid=%u", from_kuid_munged(user_ns, opts->fs_uid)); 656 seq_printf(m, ",gid=%u", from_kgid_munged(user_ns, opts->fs_gid)); 657 if (opts->dmask) 658 seq_printf(m, ",dmask=%04o", opts->fs_dmask_inv ^ 0xffff); 659 if (opts->fmask) 660 seq_printf(m, ",fmask=%04o", opts->fs_fmask_inv ^ 0xffff); 661 if (opts->sys_immutable) 662 seq_puts(m, ",sys_immutable"); 663 if (opts->discard) 664 seq_puts(m, ",discard"); 665 if (opts->force) 666 seq_puts(m, ",force"); 667 if (opts->sparse) 668 seq_puts(m, ",sparse"); 669 if (opts->nohidden) 670 seq_puts(m, ",nohidden"); 671 if (opts->hide_dot_files) 672 seq_puts(m, ",hide_dot_files"); 673 if (opts->windows_names) 674 seq_puts(m, ",windows_names"); 675 if (opts->showmeta) 676 seq_puts(m, ",showmeta"); 677 if (sb->s_flags & SB_POSIXACL) 678 seq_puts(m, ",acl"); 679 if (opts->nls) 680 seq_printf(m, ",iocharset=%s", opts->nls->charset); 681 else 682 seq_puts(m, ",iocharset=utf8"); 683 if (opts->prealloc) 684 seq_puts(m, ",prealloc"); 685 if (opts->nocase) 686 seq_puts(m, ",nocase"); 687 688 return 0; 689 } 690 691 /* 692 * ntfs_sync_fs - super_operations::sync_fs 693 */ 694 static int ntfs_sync_fs(struct super_block *sb, int wait) 695 { 696 int err = 0, err2; 697 struct ntfs_sb_info *sbi = sb->s_fs_info; 698 struct ntfs_inode *ni; 699 struct inode *inode; 700 701 ni = sbi->security.ni; 702 if (ni) { 703 inode = &ni->vfs_inode; 704 err2 = _ni_write_inode(inode, wait); 705 if (err2 && !err) 706 err = err2; 707 } 708 709 ni = sbi->objid.ni; 710 if (ni) { 711 inode = &ni->vfs_inode; 712 err2 = _ni_write_inode(inode, wait); 713 if (err2 && !err) 714 err = err2; 715 } 716 717 ni = sbi->reparse.ni; 718 if (ni) { 719 inode = &ni->vfs_inode; 720 err2 = _ni_write_inode(inode, wait); 721 if (err2 && !err) 722 err = err2; 723 } 724 725 if (!err) 726 ntfs_set_state(sbi, NTFS_DIRTY_CLEAR); 727 728 ntfs_update_mftmirr(sbi, wait); 729 730 return err; 731 } 732 733 static const struct super_operations ntfs_sops = { 734 .alloc_inode = ntfs_alloc_inode, 735 .free_inode = ntfs_free_inode, 736 .evict_inode = ntfs_evict_inode, 737 .put_super = ntfs_put_super, 738 .statfs = ntfs_statfs, 739 .show_options = ntfs_show_options, 740 .sync_fs = ntfs_sync_fs, 741 .write_inode = ntfs3_write_inode, 742 }; 743 744 static struct inode *ntfs_export_get_inode(struct super_block *sb, u64 ino, 745 u32 generation) 746 { 747 struct MFT_REF ref; 748 struct inode *inode; 749 750 ref.low = cpu_to_le32(ino); 751 #ifdef CONFIG_NTFS3_64BIT_CLUSTER 752 ref.high = cpu_to_le16(ino >> 32); 753 #else 754 ref.high = 0; 755 #endif 756 ref.seq = cpu_to_le16(generation); 757 758 inode = ntfs_iget5(sb, &ref, NULL); 759 if (!IS_ERR(inode) && is_bad_inode(inode)) { 760 iput(inode); 761 inode = ERR_PTR(-ESTALE); 762 } 763 764 return inode; 765 } 766 767 static struct dentry *ntfs_fh_to_dentry(struct super_block *sb, struct fid *fid, 768 int fh_len, int fh_type) 769 { 770 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 771 ntfs_export_get_inode); 772 } 773 774 static struct dentry *ntfs_fh_to_parent(struct super_block *sb, struct fid *fid, 775 int fh_len, int fh_type) 776 { 777 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 778 ntfs_export_get_inode); 779 } 780 781 /* TODO: == ntfs_sync_inode */ 782 static int ntfs_nfs_commit_metadata(struct inode *inode) 783 { 784 return _ni_write_inode(inode, 1); 785 } 786 787 static const struct export_operations ntfs_export_ops = { 788 .fh_to_dentry = ntfs_fh_to_dentry, 789 .fh_to_parent = ntfs_fh_to_parent, 790 .get_parent = ntfs3_get_parent, 791 .commit_metadata = ntfs_nfs_commit_metadata, 792 }; 793 794 /* 795 * format_size_gb - Return Gb,Mb to print with "%u.%02u Gb". 796 */ 797 static u32 format_size_gb(const u64 bytes, u32 *mb) 798 { 799 /* Do simple right 30 bit shift of 64 bit value. */ 800 u64 kbytes = bytes >> 10; 801 u32 kbytes32 = kbytes; 802 803 *mb = (100 * (kbytes32 & 0xfffff) + 0x7ffff) >> 20; 804 if (*mb >= 100) 805 *mb = 99; 806 807 return (kbytes32 >> 20) | (((u32)(kbytes >> 32)) << 12); 808 } 809 810 static u32 true_sectors_per_clst(const struct NTFS_BOOT *boot) 811 { 812 if (boot->sectors_per_clusters <= 0x80) 813 return boot->sectors_per_clusters; 814 if (boot->sectors_per_clusters >= 0xf4) /* limit shift to 2MB max */ 815 return 1U << (-(s8)boot->sectors_per_clusters); 816 return -EINVAL; 817 } 818 819 /* 820 * ntfs_init_from_boot - Init internal info from on-disk boot sector. 821 * 822 * NTFS mount begins from boot - special formatted 512 bytes. 823 * There are two boots: the first and the last 512 bytes of volume. 824 * The content of boot is not changed during ntfs life. 825 * 826 * NOTE: ntfs.sys checks only first (primary) boot. 827 * chkdsk checks both boots. 828 */ 829 static int ntfs_init_from_boot(struct super_block *sb, u32 sector_size, 830 u64 dev_size, struct NTFS_BOOT **boot2) 831 { 832 struct ntfs_sb_info *sbi = sb->s_fs_info; 833 int err; 834 u32 mb, gb, boot_sector_size, sct_per_clst, record_size; 835 u64 sectors, clusters, mlcn, mlcn2; 836 struct NTFS_BOOT *boot; 837 struct buffer_head *bh; 838 struct MFT_REC *rec; 839 u16 fn, ao; 840 u8 cluster_bits; 841 u32 boot_off = 0; 842 const char *hint = "Primary boot"; 843 844 sbi->volume.blocks = dev_size >> PAGE_SHIFT; 845 846 bh = ntfs_bread(sb, 0); 847 if (!bh) 848 return -EIO; 849 850 check_boot: 851 err = -EINVAL; 852 boot = (struct NTFS_BOOT *)Add2Ptr(bh->b_data, boot_off); 853 854 if (memcmp(boot->system_id, "NTFS ", sizeof("NTFS ") - 1)) { 855 ntfs_err(sb, "%s signature is not NTFS.", hint); 856 goto out; 857 } 858 859 /* 0x55AA is not mandaroty. Thanks Maxim Suhanov*/ 860 /*if (0x55 != boot->boot_magic[0] || 0xAA != boot->boot_magic[1]) 861 * goto out; 862 */ 863 864 boot_sector_size = ((u32)boot->bytes_per_sector[1] << 8) | 865 boot->bytes_per_sector[0]; 866 if (boot_sector_size < SECTOR_SIZE || 867 !is_power_of_2(boot_sector_size)) { 868 ntfs_err(sb, "%s: invalid bytes per sector %u.", hint, 869 boot_sector_size); 870 goto out; 871 } 872 873 /* cluster size: 512, 1K, 2K, 4K, ... 2M */ 874 sct_per_clst = true_sectors_per_clst(boot); 875 if ((int)sct_per_clst < 0 || !is_power_of_2(sct_per_clst)) { 876 ntfs_err(sb, "%s: invalid sectors per cluster %u.", hint, 877 sct_per_clst); 878 goto out; 879 } 880 881 sbi->cluster_size = boot_sector_size * sct_per_clst; 882 sbi->cluster_bits = cluster_bits = blksize_bits(sbi->cluster_size); 883 sbi->cluster_mask = sbi->cluster_size - 1; 884 sbi->cluster_mask_inv = ~(u64)sbi->cluster_mask; 885 886 mlcn = le64_to_cpu(boot->mft_clst); 887 mlcn2 = le64_to_cpu(boot->mft2_clst); 888 sectors = le64_to_cpu(boot->sectors_per_volume); 889 890 if (mlcn * sct_per_clst >= sectors || mlcn2 * sct_per_clst >= sectors) { 891 ntfs_err( 892 sb, 893 "%s: start of MFT 0x%llx (0x%llx) is out of volume 0x%llx.", 894 hint, mlcn, mlcn2, sectors); 895 goto out; 896 } 897 898 sbi->record_size = record_size = 899 boot->record_size < 0 ? 1 << (-boot->record_size) : 900 (u32)boot->record_size << cluster_bits; 901 sbi->record_bits = blksize_bits(record_size); 902 sbi->attr_size_tr = (5 * record_size >> 4); // ~320 bytes 903 904 /* Check MFT record size. */ 905 if (record_size < SECTOR_SIZE || !is_power_of_2(record_size)) { 906 ntfs_err(sb, "%s: invalid bytes per MFT record %u (%d).", hint, 907 record_size, boot->record_size); 908 goto out; 909 } 910 911 if (record_size > MAXIMUM_BYTES_PER_MFT) { 912 ntfs_err(sb, "Unsupported bytes per MFT record %u.", 913 record_size); 914 goto out; 915 } 916 917 sbi->index_size = boot->index_size < 0 ? 918 1u << (-boot->index_size) : 919 (u32)boot->index_size << cluster_bits; 920 921 /* Check index record size. */ 922 if (sbi->index_size < SECTOR_SIZE || !is_power_of_2(sbi->index_size)) { 923 ntfs_err(sb, "%s: invalid bytes per index %u(%d).", hint, 924 sbi->index_size, boot->index_size); 925 goto out; 926 } 927 928 if (sbi->index_size > MAXIMUM_BYTES_PER_INDEX) { 929 ntfs_err(sb, "%s: unsupported bytes per index %u.", hint, 930 sbi->index_size); 931 goto out; 932 } 933 934 sbi->volume.size = sectors * boot_sector_size; 935 936 gb = format_size_gb(sbi->volume.size + boot_sector_size, &mb); 937 938 /* 939 * - Volume formatted and mounted with the same sector size. 940 * - Volume formatted 4K and mounted as 512. 941 * - Volume formatted 512 and mounted as 4K. 942 */ 943 if (boot_sector_size != sector_size) { 944 ntfs_warn( 945 sb, 946 "Different NTFS sector size (%u) and media sector size (%u).", 947 boot_sector_size, sector_size); 948 dev_size += sector_size - 1; 949 } 950 951 sbi->mft.lbo = mlcn << cluster_bits; 952 sbi->mft.lbo2 = mlcn2 << cluster_bits; 953 954 /* Compare boot's cluster and sector. */ 955 if (sbi->cluster_size < boot_sector_size) { 956 ntfs_err(sb, "%s: invalid bytes per cluster (%u).", hint, 957 sbi->cluster_size); 958 goto out; 959 } 960 961 /* Compare boot's cluster and media sector. */ 962 if (sbi->cluster_size < sector_size) { 963 /* No way to use ntfs_get_block in this case. */ 964 ntfs_err( 965 sb, 966 "Failed to mount 'cause NTFS's cluster size (%u) is less than media sector size (%u).", 967 sbi->cluster_size, sector_size); 968 goto out; 969 } 970 971 sbi->max_bytes_per_attr = 972 record_size - ALIGN(MFTRECORD_FIXUP_OFFSET, 8) - 973 ALIGN(((record_size >> SECTOR_SHIFT) * sizeof(short)), 8) - 974 ALIGN(sizeof(enum ATTR_TYPE), 8); 975 976 sbi->volume.ser_num = le64_to_cpu(boot->serial_num); 977 978 /* Warning if RAW volume. */ 979 if (dev_size < sbi->volume.size + boot_sector_size) { 980 u32 mb0, gb0; 981 982 gb0 = format_size_gb(dev_size, &mb0); 983 ntfs_warn( 984 sb, 985 "RAW NTFS volume: Filesystem size %u.%02u Gb > volume size %u.%02u Gb. Mount in read-only.", 986 gb, mb, gb0, mb0); 987 sb->s_flags |= SB_RDONLY; 988 } 989 990 clusters = sbi->volume.size >> cluster_bits; 991 #ifndef CONFIG_NTFS3_64BIT_CLUSTER 992 /* 32 bits per cluster. */ 993 if (clusters >> 32) { 994 ntfs_notice( 995 sb, 996 "NTFS %u.%02u Gb is too big to use 32 bits per cluster.", 997 gb, mb); 998 goto out; 999 } 1000 #elif BITS_PER_LONG < 64 1001 #error "CONFIG_NTFS3_64BIT_CLUSTER incompatible in 32 bit OS" 1002 #endif 1003 1004 sbi->used.bitmap.nbits = clusters; 1005 1006 rec = kzalloc(record_size, GFP_NOFS); 1007 if (!rec) { 1008 err = -ENOMEM; 1009 goto out; 1010 } 1011 1012 sbi->new_rec = rec; 1013 rec->rhdr.sign = NTFS_FILE_SIGNATURE; 1014 rec->rhdr.fix_off = cpu_to_le16(MFTRECORD_FIXUP_OFFSET); 1015 fn = (sbi->record_size >> SECTOR_SHIFT) + 1; 1016 rec->rhdr.fix_num = cpu_to_le16(fn); 1017 ao = ALIGN(MFTRECORD_FIXUP_OFFSET + sizeof(short) * fn, 8); 1018 rec->attr_off = cpu_to_le16(ao); 1019 rec->used = cpu_to_le32(ao + ALIGN(sizeof(enum ATTR_TYPE), 8)); 1020 rec->total = cpu_to_le32(sbi->record_size); 1021 ((struct ATTRIB *)Add2Ptr(rec, ao))->type = ATTR_END; 1022 1023 sb_set_blocksize(sb, min_t(u32, sbi->cluster_size, PAGE_SIZE)); 1024 1025 sbi->block_mask = sb->s_blocksize - 1; 1026 sbi->blocks_per_cluster = sbi->cluster_size >> sb->s_blocksize_bits; 1027 sbi->volume.blocks = sbi->volume.size >> sb->s_blocksize_bits; 1028 1029 /* Maximum size for normal files. */ 1030 sbi->maxbytes = (clusters << cluster_bits) - 1; 1031 1032 #ifdef CONFIG_NTFS3_64BIT_CLUSTER 1033 if (clusters >= (1ull << (64 - cluster_bits))) 1034 sbi->maxbytes = -1; 1035 sbi->maxbytes_sparse = -1; 1036 sb->s_maxbytes = MAX_LFS_FILESIZE; 1037 #else 1038 /* Maximum size for sparse file. */ 1039 sbi->maxbytes_sparse = (1ull << (cluster_bits + 32)) - 1; 1040 sb->s_maxbytes = 0xFFFFFFFFull << cluster_bits; 1041 #endif 1042 1043 /* 1044 * Compute the MFT zone at two steps. 1045 * It would be nice if we are able to allocate 1/8 of 1046 * total clusters for MFT but not more then 512 MB. 1047 */ 1048 sbi->zone_max = min_t(CLST, 0x20000000 >> cluster_bits, clusters >> 3); 1049 1050 err = 0; 1051 1052 if (bh->b_blocknr && !sb_rdonly(sb)) { 1053 /* 1054 * Alternative boot is ok but primary is not ok. 1055 * Do not update primary boot here 'cause it may be faked boot. 1056 * Let ntfs to be mounted and update boot later. 1057 */ 1058 *boot2 = kmemdup(boot, sizeof(*boot), GFP_NOFS | __GFP_NOWARN); 1059 } 1060 1061 out: 1062 if (err == -EINVAL && !bh->b_blocknr && dev_size > PAGE_SHIFT) { 1063 u32 block_size = min_t(u32, sector_size, PAGE_SIZE); 1064 u64 lbo = dev_size - sizeof(*boot); 1065 1066 /* 1067 * Try alternative boot (last sector) 1068 */ 1069 brelse(bh); 1070 1071 sb_set_blocksize(sb, block_size); 1072 bh = ntfs_bread(sb, lbo >> blksize_bits(block_size)); 1073 if (!bh) 1074 return -EINVAL; 1075 1076 boot_off = lbo & (block_size - 1); 1077 hint = "Alternative boot"; 1078 goto check_boot; 1079 } 1080 brelse(bh); 1081 1082 return err; 1083 } 1084 1085 /* 1086 * ntfs_fill_super - Try to mount. 1087 */ 1088 static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc) 1089 { 1090 int err; 1091 struct ntfs_sb_info *sbi = sb->s_fs_info; 1092 struct block_device *bdev = sb->s_bdev; 1093 struct ntfs_mount_options *options; 1094 struct inode *inode; 1095 struct ntfs_inode *ni; 1096 size_t i, tt, bad_len, bad_frags; 1097 CLST vcn, lcn, len; 1098 struct ATTRIB *attr; 1099 const struct VOLUME_INFO *info; 1100 u32 idx, done, bytes; 1101 struct ATTR_DEF_ENTRY *t; 1102 u16 *shared; 1103 struct MFT_REF ref; 1104 bool ro = sb_rdonly(sb); 1105 struct NTFS_BOOT *boot2 = NULL; 1106 1107 ref.high = 0; 1108 1109 sbi->sb = sb; 1110 sbi->options = options = fc->fs_private; 1111 fc->fs_private = NULL; 1112 sb->s_flags |= SB_NODIRATIME; 1113 sb->s_magic = 0x7366746e; // "ntfs" 1114 sb->s_op = &ntfs_sops; 1115 sb->s_export_op = &ntfs_export_ops; 1116 sb->s_time_gran = NTFS_TIME_GRAN; // 100 nsec 1117 sb->s_xattr = ntfs_xattr_handlers; 1118 sb->s_d_op = options->nocase ? &ntfs_dentry_ops : NULL; 1119 1120 options->nls = ntfs_load_nls(options->nls_name); 1121 if (IS_ERR(options->nls)) { 1122 options->nls = NULL; 1123 errorf(fc, "Cannot load nls %s", options->nls_name); 1124 err = -EINVAL; 1125 goto out; 1126 } 1127 1128 if (bdev_max_discard_sectors(bdev) && bdev_discard_granularity(bdev)) { 1129 sbi->discard_granularity = bdev_discard_granularity(bdev); 1130 sbi->discard_granularity_mask_inv = 1131 ~(u64)(sbi->discard_granularity - 1); 1132 } 1133 1134 /* Parse boot. */ 1135 err = ntfs_init_from_boot(sb, bdev_logical_block_size(bdev), 1136 bdev_nr_bytes(bdev), &boot2); 1137 if (err) 1138 goto out; 1139 1140 /* 1141 * Load $Volume. This should be done before $LogFile 1142 * 'cause 'sbi->volume.ni' is used 'ntfs_set_state'. 1143 */ 1144 ref.low = cpu_to_le32(MFT_REC_VOL); 1145 ref.seq = cpu_to_le16(MFT_REC_VOL); 1146 inode = ntfs_iget5(sb, &ref, &NAME_VOLUME); 1147 if (IS_ERR(inode)) { 1148 err = PTR_ERR(inode); 1149 ntfs_err(sb, "Failed to load $Volume (%d).", err); 1150 goto out; 1151 } 1152 1153 ni = ntfs_i(inode); 1154 1155 /* Load and save label (not necessary). */ 1156 attr = ni_find_attr(ni, NULL, NULL, ATTR_LABEL, NULL, 0, NULL, NULL); 1157 1158 if (!attr) { 1159 /* It is ok if no ATTR_LABEL */ 1160 } else if (!attr->non_res && !is_attr_ext(attr)) { 1161 /* $AttrDef allows labels to be up to 128 symbols. */ 1162 err = utf16s_to_utf8s(resident_data(attr), 1163 le32_to_cpu(attr->res.data_size) >> 1, 1164 UTF16_LITTLE_ENDIAN, sbi->volume.label, 1165 sizeof(sbi->volume.label)); 1166 if (err < 0) 1167 sbi->volume.label[0] = 0; 1168 } else { 1169 /* Should we break mounting here? */ 1170 //err = -EINVAL; 1171 //goto put_inode_out; 1172 } 1173 1174 attr = ni_find_attr(ni, attr, NULL, ATTR_VOL_INFO, NULL, 0, NULL, NULL); 1175 if (!attr || is_attr_ext(attr) || 1176 !(info = resident_data_ex(attr, SIZEOF_ATTRIBUTE_VOLUME_INFO))) { 1177 ntfs_err(sb, "$Volume is corrupted."); 1178 err = -EINVAL; 1179 goto put_inode_out; 1180 } 1181 1182 sbi->volume.major_ver = info->major_ver; 1183 sbi->volume.minor_ver = info->minor_ver; 1184 sbi->volume.flags = info->flags; 1185 sbi->volume.ni = ni; 1186 if (info->flags & VOLUME_FLAG_DIRTY) { 1187 sbi->volume.real_dirty = true; 1188 ntfs_info(sb, "It is recommened to use chkdsk."); 1189 } 1190 1191 /* Load $MFTMirr to estimate recs_mirr. */ 1192 ref.low = cpu_to_le32(MFT_REC_MIRR); 1193 ref.seq = cpu_to_le16(MFT_REC_MIRR); 1194 inode = ntfs_iget5(sb, &ref, &NAME_MIRROR); 1195 if (IS_ERR(inode)) { 1196 err = PTR_ERR(inode); 1197 ntfs_err(sb, "Failed to load $MFTMirr (%d).", err); 1198 goto out; 1199 } 1200 1201 sbi->mft.recs_mirr = ntfs_up_cluster(sbi, inode->i_size) >> 1202 sbi->record_bits; 1203 1204 iput(inode); 1205 1206 /* Load LogFile to replay. */ 1207 ref.low = cpu_to_le32(MFT_REC_LOG); 1208 ref.seq = cpu_to_le16(MFT_REC_LOG); 1209 inode = ntfs_iget5(sb, &ref, &NAME_LOGFILE); 1210 if (IS_ERR(inode)) { 1211 err = PTR_ERR(inode); 1212 ntfs_err(sb, "Failed to load \x24LogFile (%d).", err); 1213 goto out; 1214 } 1215 1216 ni = ntfs_i(inode); 1217 1218 err = ntfs_loadlog_and_replay(ni, sbi); 1219 if (err) 1220 goto put_inode_out; 1221 1222 iput(inode); 1223 1224 if ((sbi->flags & NTFS_FLAGS_NEED_REPLAY) && !ro) { 1225 ntfs_warn(sb, "failed to replay log file. Can't mount rw!"); 1226 err = -EINVAL; 1227 goto out; 1228 } 1229 1230 if ((sbi->volume.flags & VOLUME_FLAG_DIRTY) && !ro && !options->force) { 1231 ntfs_warn(sb, "volume is dirty and \"force\" flag is not set!"); 1232 err = -EINVAL; 1233 goto out; 1234 } 1235 1236 /* Load $MFT. */ 1237 ref.low = cpu_to_le32(MFT_REC_MFT); 1238 ref.seq = cpu_to_le16(1); 1239 1240 inode = ntfs_iget5(sb, &ref, &NAME_MFT); 1241 if (IS_ERR(inode)) { 1242 err = PTR_ERR(inode); 1243 ntfs_err(sb, "Failed to load $MFT (%d).", err); 1244 goto out; 1245 } 1246 1247 ni = ntfs_i(inode); 1248 1249 sbi->mft.used = ni->i_valid >> sbi->record_bits; 1250 tt = inode->i_size >> sbi->record_bits; 1251 sbi->mft.next_free = MFT_REC_USER; 1252 1253 err = wnd_init(&sbi->mft.bitmap, sb, tt); 1254 if (err) 1255 goto put_inode_out; 1256 1257 err = ni_load_all_mi(ni); 1258 if (err) { 1259 ntfs_err(sb, "Failed to load $MFT's subrecords (%d).", err); 1260 goto put_inode_out; 1261 } 1262 1263 sbi->mft.ni = ni; 1264 1265 /* Load $Bitmap. */ 1266 ref.low = cpu_to_le32(MFT_REC_BITMAP); 1267 ref.seq = cpu_to_le16(MFT_REC_BITMAP); 1268 inode = ntfs_iget5(sb, &ref, &NAME_BITMAP); 1269 if (IS_ERR(inode)) { 1270 err = PTR_ERR(inode); 1271 ntfs_err(sb, "Failed to load $Bitmap (%d).", err); 1272 goto out; 1273 } 1274 1275 #ifndef CONFIG_NTFS3_64BIT_CLUSTER 1276 if (inode->i_size >> 32) { 1277 err = -EINVAL; 1278 goto put_inode_out; 1279 } 1280 #endif 1281 1282 /* Check bitmap boundary. */ 1283 tt = sbi->used.bitmap.nbits; 1284 if (inode->i_size < bitmap_size(tt)) { 1285 ntfs_err(sb, "$Bitmap is corrupted."); 1286 err = -EINVAL; 1287 goto put_inode_out; 1288 } 1289 1290 err = wnd_init(&sbi->used.bitmap, sb, tt); 1291 if (err) { 1292 ntfs_err(sb, "Failed to initialize $Bitmap (%d).", err); 1293 goto put_inode_out; 1294 } 1295 1296 iput(inode); 1297 1298 /* Compute the MFT zone. */ 1299 err = ntfs_refresh_zone(sbi); 1300 if (err) { 1301 ntfs_err(sb, "Failed to initialize MFT zone (%d).", err); 1302 goto out; 1303 } 1304 1305 /* Load $BadClus. */ 1306 ref.low = cpu_to_le32(MFT_REC_BADCLUST); 1307 ref.seq = cpu_to_le16(MFT_REC_BADCLUST); 1308 inode = ntfs_iget5(sb, &ref, &NAME_BADCLUS); 1309 if (IS_ERR(inode)) { 1310 err = PTR_ERR(inode); 1311 ntfs_err(sb, "Failed to load $BadClus (%d).", err); 1312 goto out; 1313 } 1314 1315 ni = ntfs_i(inode); 1316 bad_len = bad_frags = 0; 1317 for (i = 0; run_get_entry(&ni->file.run, i, &vcn, &lcn, &len); i++) { 1318 if (lcn == SPARSE_LCN) 1319 continue; 1320 1321 bad_len += len; 1322 bad_frags += 1; 1323 if (ro) 1324 continue; 1325 1326 if (wnd_set_used_safe(&sbi->used.bitmap, lcn, len, &tt) || tt) { 1327 /* Bad blocks marked as free in bitmap. */ 1328 ntfs_set_state(sbi, NTFS_DIRTY_ERROR); 1329 } 1330 } 1331 if (bad_len) { 1332 /* 1333 * Notice about bad blocks. 1334 * In normal cases these blocks are marked as used in bitmap. 1335 * And we never allocate space in it. 1336 */ 1337 ntfs_notice(sb, 1338 "Volume contains %zu bad blocks in %zu fragments.", 1339 bad_len, bad_frags); 1340 } 1341 iput(inode); 1342 1343 /* Load $AttrDef. */ 1344 ref.low = cpu_to_le32(MFT_REC_ATTR); 1345 ref.seq = cpu_to_le16(MFT_REC_ATTR); 1346 inode = ntfs_iget5(sb, &ref, &NAME_ATTRDEF); 1347 if (IS_ERR(inode)) { 1348 err = PTR_ERR(inode); 1349 ntfs_err(sb, "Failed to load $AttrDef (%d)", err); 1350 goto out; 1351 } 1352 1353 /* 1354 * Typical $AttrDef contains up to 20 entries. 1355 * Check for extremely large/small size. 1356 */ 1357 if (inode->i_size < sizeof(struct ATTR_DEF_ENTRY) || 1358 inode->i_size > 100 * sizeof(struct ATTR_DEF_ENTRY)) { 1359 ntfs_err(sb, "Looks like $AttrDef is corrupted (size=%llu).", 1360 inode->i_size); 1361 err = -EINVAL; 1362 goto put_inode_out; 1363 } 1364 1365 bytes = inode->i_size; 1366 sbi->def_table = t = kmalloc(bytes, GFP_NOFS | __GFP_NOWARN); 1367 if (!t) { 1368 err = -ENOMEM; 1369 goto put_inode_out; 1370 } 1371 1372 for (done = idx = 0; done < bytes; done += PAGE_SIZE, idx++) { 1373 unsigned long tail = bytes - done; 1374 struct page *page = ntfs_map_page(inode->i_mapping, idx); 1375 1376 if (IS_ERR(page)) { 1377 err = PTR_ERR(page); 1378 ntfs_err(sb, "Failed to read $AttrDef (%d).", err); 1379 goto put_inode_out; 1380 } 1381 memcpy(Add2Ptr(t, done), page_address(page), 1382 min(PAGE_SIZE, tail)); 1383 ntfs_unmap_page(page); 1384 1385 if (!idx && ATTR_STD != t->type) { 1386 ntfs_err(sb, "$AttrDef is corrupted."); 1387 err = -EINVAL; 1388 goto put_inode_out; 1389 } 1390 } 1391 1392 t += 1; 1393 sbi->def_entries = 1; 1394 done = sizeof(struct ATTR_DEF_ENTRY); 1395 sbi->reparse.max_size = MAXIMUM_REPARSE_DATA_BUFFER_SIZE; 1396 sbi->ea_max_size = 0x10000; /* default formatter value */ 1397 1398 while (done + sizeof(struct ATTR_DEF_ENTRY) <= bytes) { 1399 u32 t32 = le32_to_cpu(t->type); 1400 u64 sz = le64_to_cpu(t->max_sz); 1401 1402 if ((t32 & 0xF) || le32_to_cpu(t[-1].type) >= t32) 1403 break; 1404 1405 if (t->type == ATTR_REPARSE) 1406 sbi->reparse.max_size = sz; 1407 else if (t->type == ATTR_EA) 1408 sbi->ea_max_size = sz; 1409 1410 done += sizeof(struct ATTR_DEF_ENTRY); 1411 t += 1; 1412 sbi->def_entries += 1; 1413 } 1414 iput(inode); 1415 1416 /* Load $UpCase. */ 1417 ref.low = cpu_to_le32(MFT_REC_UPCASE); 1418 ref.seq = cpu_to_le16(MFT_REC_UPCASE); 1419 inode = ntfs_iget5(sb, &ref, &NAME_UPCASE); 1420 if (IS_ERR(inode)) { 1421 err = PTR_ERR(inode); 1422 ntfs_err(sb, "Failed to load $UpCase (%d).", err); 1423 goto out; 1424 } 1425 1426 if (inode->i_size != 0x10000 * sizeof(short)) { 1427 err = -EINVAL; 1428 ntfs_err(sb, "$UpCase is corrupted."); 1429 goto put_inode_out; 1430 } 1431 1432 for (idx = 0; idx < (0x10000 * sizeof(short) >> PAGE_SHIFT); idx++) { 1433 const __le16 *src; 1434 u16 *dst = Add2Ptr(sbi->upcase, idx << PAGE_SHIFT); 1435 struct page *page = ntfs_map_page(inode->i_mapping, idx); 1436 1437 if (IS_ERR(page)) { 1438 err = PTR_ERR(page); 1439 ntfs_err(sb, "Failed to read $UpCase (%d).", err); 1440 goto put_inode_out; 1441 } 1442 1443 src = page_address(page); 1444 1445 #ifdef __BIG_ENDIAN 1446 for (i = 0; i < PAGE_SIZE / sizeof(u16); i++) 1447 *dst++ = le16_to_cpu(*src++); 1448 #else 1449 memcpy(dst, src, PAGE_SIZE); 1450 #endif 1451 ntfs_unmap_page(page); 1452 } 1453 1454 shared = ntfs_set_shared(sbi->upcase, 0x10000 * sizeof(short)); 1455 if (shared && sbi->upcase != shared) { 1456 kvfree(sbi->upcase); 1457 sbi->upcase = shared; 1458 } 1459 1460 iput(inode); 1461 1462 if (is_ntfs3(sbi)) { 1463 /* Load $Secure. */ 1464 err = ntfs_security_init(sbi); 1465 if (err) { 1466 ntfs_err(sb, "Failed to initialize $Secure (%d).", err); 1467 goto out; 1468 } 1469 1470 /* Load $Extend. */ 1471 err = ntfs_extend_init(sbi); 1472 if (err) { 1473 ntfs_warn(sb, "Failed to initialize $Extend."); 1474 goto load_root; 1475 } 1476 1477 /* Load $Extend/$Reparse. */ 1478 err = ntfs_reparse_init(sbi); 1479 if (err) { 1480 ntfs_warn(sb, "Failed to initialize $Extend/$Reparse."); 1481 goto load_root; 1482 } 1483 1484 /* Load $Extend/$ObjId. */ 1485 err = ntfs_objid_init(sbi); 1486 if (err) { 1487 ntfs_warn(sb, "Failed to initialize $Extend/$ObjId."); 1488 goto load_root; 1489 } 1490 } 1491 1492 load_root: 1493 /* Load root. */ 1494 ref.low = cpu_to_le32(MFT_REC_ROOT); 1495 ref.seq = cpu_to_le16(MFT_REC_ROOT); 1496 inode = ntfs_iget5(sb, &ref, &NAME_ROOT); 1497 if (IS_ERR(inode)) { 1498 err = PTR_ERR(inode); 1499 ntfs_err(sb, "Failed to load root (%d).", err); 1500 goto out; 1501 } 1502 1503 /* 1504 * Final check. Looks like this case should never occurs. 1505 */ 1506 if (!inode->i_op) { 1507 err = -EINVAL; 1508 ntfs_err(sb, "Failed to load root (%d).", err); 1509 goto put_inode_out; 1510 } 1511 1512 sb->s_root = d_make_root(inode); 1513 if (!sb->s_root) { 1514 err = -ENOMEM; 1515 goto put_inode_out; 1516 } 1517 1518 if (boot2) { 1519 /* 1520 * Alternative boot is ok but primary is not ok. 1521 * Volume is recognized as NTFS. Update primary boot. 1522 */ 1523 struct buffer_head *bh0 = sb_getblk(sb, 0); 1524 if (bh0) { 1525 if (buffer_locked(bh0)) 1526 __wait_on_buffer(bh0); 1527 1528 lock_buffer(bh0); 1529 memcpy(bh0->b_data, boot2, sizeof(*boot2)); 1530 set_buffer_uptodate(bh0); 1531 mark_buffer_dirty(bh0); 1532 unlock_buffer(bh0); 1533 if (!sync_dirty_buffer(bh0)) 1534 ntfs_warn(sb, "primary boot is updated"); 1535 put_bh(bh0); 1536 } 1537 1538 kfree(boot2); 1539 } 1540 1541 #ifdef CONFIG_PROC_FS 1542 /* Create /proc/fs/ntfs3/.. */ 1543 if (proc_info_root) { 1544 struct proc_dir_entry *e = proc_mkdir(sb->s_id, proc_info_root); 1545 static_assert((S_IRUGO | S_IWUSR) == 0644); 1546 if (e) { 1547 proc_create_data("volinfo", S_IRUGO, e, 1548 &ntfs3_volinfo_fops, sb); 1549 proc_create_data("label", S_IRUGO | S_IWUSR, e, 1550 &ntfs3_label_fops, sb); 1551 sbi->procdir = e; 1552 } 1553 } 1554 #endif 1555 1556 return 0; 1557 1558 put_inode_out: 1559 iput(inode); 1560 out: 1561 kfree(boot2); 1562 return err; 1563 } 1564 1565 void ntfs_unmap_meta(struct super_block *sb, CLST lcn, CLST len) 1566 { 1567 struct ntfs_sb_info *sbi = sb->s_fs_info; 1568 struct block_device *bdev = sb->s_bdev; 1569 sector_t devblock = (u64)lcn * sbi->blocks_per_cluster; 1570 unsigned long blocks = (u64)len * sbi->blocks_per_cluster; 1571 unsigned long cnt = 0; 1572 unsigned long limit = global_zone_page_state(NR_FREE_PAGES) 1573 << (PAGE_SHIFT - sb->s_blocksize_bits); 1574 1575 if (limit >= 0x2000) 1576 limit -= 0x1000; 1577 else if (limit < 32) 1578 limit = 32; 1579 else 1580 limit >>= 1; 1581 1582 while (blocks--) { 1583 clean_bdev_aliases(bdev, devblock++, 1); 1584 if (cnt++ >= limit) { 1585 sync_blockdev(bdev); 1586 cnt = 0; 1587 } 1588 } 1589 } 1590 1591 /* 1592 * ntfs_discard - Issue a discard request (trim for SSD). 1593 */ 1594 int ntfs_discard(struct ntfs_sb_info *sbi, CLST lcn, CLST len) 1595 { 1596 int err; 1597 u64 lbo, bytes, start, end; 1598 struct super_block *sb; 1599 1600 if (sbi->used.next_free_lcn == lcn + len) 1601 sbi->used.next_free_lcn = lcn; 1602 1603 if (sbi->flags & NTFS_FLAGS_NODISCARD) 1604 return -EOPNOTSUPP; 1605 1606 if (!sbi->options->discard) 1607 return -EOPNOTSUPP; 1608 1609 lbo = (u64)lcn << sbi->cluster_bits; 1610 bytes = (u64)len << sbi->cluster_bits; 1611 1612 /* Align up 'start' on discard_granularity. */ 1613 start = (lbo + sbi->discard_granularity - 1) & 1614 sbi->discard_granularity_mask_inv; 1615 /* Align down 'end' on discard_granularity. */ 1616 end = (lbo + bytes) & sbi->discard_granularity_mask_inv; 1617 1618 sb = sbi->sb; 1619 if (start >= end) 1620 return 0; 1621 1622 err = blkdev_issue_discard(sb->s_bdev, start >> 9, (end - start) >> 9, 1623 GFP_NOFS); 1624 1625 if (err == -EOPNOTSUPP) 1626 sbi->flags |= NTFS_FLAGS_NODISCARD; 1627 1628 return err; 1629 } 1630 1631 static int ntfs_fs_get_tree(struct fs_context *fc) 1632 { 1633 return get_tree_bdev(fc, ntfs_fill_super); 1634 } 1635 1636 /* 1637 * ntfs_fs_free - Free fs_context. 1638 * 1639 * Note that this will be called after fill_super and reconfigure 1640 * even when they pass. So they have to take pointers if they pass. 1641 */ 1642 static void ntfs_fs_free(struct fs_context *fc) 1643 { 1644 struct ntfs_mount_options *opts = fc->fs_private; 1645 struct ntfs_sb_info *sbi = fc->s_fs_info; 1646 1647 if (sbi) 1648 ntfs3_free_sbi(sbi); 1649 1650 if (opts) 1651 put_mount_options(opts); 1652 } 1653 1654 // clang-format off 1655 static const struct fs_context_operations ntfs_context_ops = { 1656 .parse_param = ntfs_fs_parse_param, 1657 .get_tree = ntfs_fs_get_tree, 1658 .reconfigure = ntfs_fs_reconfigure, 1659 .free = ntfs_fs_free, 1660 }; 1661 // clang-format on 1662 1663 /* 1664 * ntfs_init_fs_context - Initialize sbi and opts 1665 * 1666 * This will called when mount/remount. We will first initialize 1667 * options so that if remount we can use just that. 1668 */ 1669 static int ntfs_init_fs_context(struct fs_context *fc) 1670 { 1671 struct ntfs_mount_options *opts; 1672 struct ntfs_sb_info *sbi; 1673 1674 opts = kzalloc(sizeof(struct ntfs_mount_options), GFP_NOFS); 1675 if (!opts) 1676 return -ENOMEM; 1677 1678 /* Default options. */ 1679 opts->fs_uid = current_uid(); 1680 opts->fs_gid = current_gid(); 1681 opts->fs_fmask_inv = ~current_umask(); 1682 opts->fs_dmask_inv = ~current_umask(); 1683 1684 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) 1685 goto ok; 1686 1687 sbi = kzalloc(sizeof(struct ntfs_sb_info), GFP_NOFS); 1688 if (!sbi) 1689 goto free_opts; 1690 1691 sbi->upcase = kvmalloc(0x10000 * sizeof(short), GFP_KERNEL); 1692 if (!sbi->upcase) 1693 goto free_sbi; 1694 1695 ratelimit_state_init(&sbi->msg_ratelimit, DEFAULT_RATELIMIT_INTERVAL, 1696 DEFAULT_RATELIMIT_BURST); 1697 1698 mutex_init(&sbi->compress.mtx_lznt); 1699 #ifdef CONFIG_NTFS3_LZX_XPRESS 1700 mutex_init(&sbi->compress.mtx_xpress); 1701 mutex_init(&sbi->compress.mtx_lzx); 1702 #endif 1703 1704 fc->s_fs_info = sbi; 1705 ok: 1706 fc->fs_private = opts; 1707 fc->ops = &ntfs_context_ops; 1708 1709 return 0; 1710 free_sbi: 1711 kfree(sbi); 1712 free_opts: 1713 kfree(opts); 1714 return -ENOMEM; 1715 } 1716 1717 static void ntfs3_kill_sb(struct super_block *sb) 1718 { 1719 struct ntfs_sb_info *sbi = sb->s_fs_info; 1720 1721 kill_block_super(sb); 1722 1723 if (sbi->options) 1724 put_mount_options(sbi->options); 1725 ntfs3_free_sbi(sbi); 1726 } 1727 1728 // clang-format off 1729 static struct file_system_type ntfs_fs_type = { 1730 .owner = THIS_MODULE, 1731 .name = "ntfs3", 1732 .init_fs_context = ntfs_init_fs_context, 1733 .parameters = ntfs_fs_parameters, 1734 .kill_sb = ntfs3_kill_sb, 1735 .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP, 1736 }; 1737 // clang-format on 1738 1739 static int __init init_ntfs_fs(void) 1740 { 1741 int err; 1742 1743 pr_info("ntfs3: Max link count %u\n", NTFS_LINK_MAX); 1744 1745 if (IS_ENABLED(CONFIG_NTFS3_FS_POSIX_ACL)) 1746 pr_info("ntfs3: Enabled Linux POSIX ACLs support\n"); 1747 if (IS_ENABLED(CONFIG_NTFS3_64BIT_CLUSTER)) 1748 pr_notice( 1749 "ntfs3: Warning: Activated 64 bits per cluster. Windows does not support this\n"); 1750 if (IS_ENABLED(CONFIG_NTFS3_LZX_XPRESS)) 1751 pr_info("ntfs3: Read-only LZX/Xpress compression included\n"); 1752 1753 1754 #ifdef CONFIG_PROC_FS 1755 /* Create "/proc/fs/ntfs3" */ 1756 proc_info_root = proc_mkdir("fs/ntfs3", NULL); 1757 #endif 1758 1759 err = ntfs3_init_bitmap(); 1760 if (err) 1761 return err; 1762 1763 ntfs_inode_cachep = kmem_cache_create( 1764 "ntfs_inode_cache", sizeof(struct ntfs_inode), 0, 1765 (SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD | SLAB_ACCOUNT), 1766 init_once); 1767 if (!ntfs_inode_cachep) { 1768 err = -ENOMEM; 1769 goto out1; 1770 } 1771 1772 err = register_filesystem(&ntfs_fs_type); 1773 if (err) 1774 goto out; 1775 1776 return 0; 1777 out: 1778 kmem_cache_destroy(ntfs_inode_cachep); 1779 out1: 1780 ntfs3_exit_bitmap(); 1781 return err; 1782 } 1783 1784 static void __exit exit_ntfs_fs(void) 1785 { 1786 rcu_barrier(); 1787 kmem_cache_destroy(ntfs_inode_cachep); 1788 unregister_filesystem(&ntfs_fs_type); 1789 ntfs3_exit_bitmap(); 1790 1791 #ifdef CONFIG_PROC_FS 1792 if (proc_info_root) 1793 remove_proc_entry("fs/ntfs3", NULL); 1794 #endif 1795 1796 } 1797 1798 MODULE_LICENSE("GPL"); 1799 MODULE_DESCRIPTION("ntfs3 read/write filesystem"); 1800 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 1801 MODULE_INFO(behaviour, "Enabled Linux POSIX ACLs support"); 1802 #endif 1803 #ifdef CONFIG_NTFS3_64BIT_CLUSTER 1804 MODULE_INFO( 1805 cluster, 1806 "Warning: Activated 64 bits per cluster. Windows does not support this"); 1807 #endif 1808 #ifdef CONFIG_NTFS3_LZX_XPRESS 1809 MODULE_INFO(compression, "Read-only lzx/xpress compression included"); 1810 #endif 1811 1812 MODULE_AUTHOR("Konstantin Komarov"); 1813 MODULE_ALIAS_FS("ntfs3"); 1814 1815 module_init(init_ntfs_fs); 1816 module_exit(exit_ntfs_fs); 1817