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 * put_ntfs - Noinline to reduce binary size. 573 */ 574 static noinline void put_ntfs(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 put_mount_options(sbi->options); 630 put_ntfs(sbi); 631 sb->s_fs_info = NULL; 632 633 sync_blockdev(sb->s_bdev); 634 } 635 636 static int ntfs_statfs(struct dentry *dentry, struct kstatfs *buf) 637 { 638 struct super_block *sb = dentry->d_sb; 639 struct ntfs_sb_info *sbi = sb->s_fs_info; 640 struct wnd_bitmap *wnd = &sbi->used.bitmap; 641 642 buf->f_type = sb->s_magic; 643 buf->f_bsize = sbi->cluster_size; 644 buf->f_blocks = wnd->nbits; 645 646 buf->f_bfree = buf->f_bavail = wnd_zeroes(wnd); 647 buf->f_fsid.val[0] = sbi->volume.ser_num; 648 buf->f_fsid.val[1] = (sbi->volume.ser_num >> 32); 649 buf->f_namelen = NTFS_NAME_LEN; 650 651 return 0; 652 } 653 654 static int ntfs_show_options(struct seq_file *m, struct dentry *root) 655 { 656 struct super_block *sb = root->d_sb; 657 struct ntfs_sb_info *sbi = sb->s_fs_info; 658 struct ntfs_mount_options *opts = sbi->options; 659 struct user_namespace *user_ns = seq_user_ns(m); 660 661 seq_printf(m, ",uid=%u", from_kuid_munged(user_ns, opts->fs_uid)); 662 seq_printf(m, ",gid=%u", from_kgid_munged(user_ns, opts->fs_gid)); 663 if (opts->dmask) 664 seq_printf(m, ",dmask=%04o", opts->fs_dmask_inv ^ 0xffff); 665 if (opts->fmask) 666 seq_printf(m, ",fmask=%04o", opts->fs_fmask_inv ^ 0xffff); 667 if (opts->sys_immutable) 668 seq_puts(m, ",sys_immutable"); 669 if (opts->discard) 670 seq_puts(m, ",discard"); 671 if (opts->force) 672 seq_puts(m, ",force"); 673 if (opts->sparse) 674 seq_puts(m, ",sparse"); 675 if (opts->nohidden) 676 seq_puts(m, ",nohidden"); 677 if (opts->hide_dot_files) 678 seq_puts(m, ",hide_dot_files"); 679 if (opts->windows_names) 680 seq_puts(m, ",windows_names"); 681 if (opts->showmeta) 682 seq_puts(m, ",showmeta"); 683 if (sb->s_flags & SB_POSIXACL) 684 seq_puts(m, ",acl"); 685 if (opts->nls) 686 seq_printf(m, ",iocharset=%s", opts->nls->charset); 687 else 688 seq_puts(m, ",iocharset=utf8"); 689 if (opts->prealloc) 690 seq_puts(m, ",prealloc"); 691 if (opts->nocase) 692 seq_puts(m, ",nocase"); 693 694 return 0; 695 } 696 697 /* 698 * ntfs_sync_fs - super_operations::sync_fs 699 */ 700 static int ntfs_sync_fs(struct super_block *sb, int wait) 701 { 702 int err = 0, err2; 703 struct ntfs_sb_info *sbi = sb->s_fs_info; 704 struct ntfs_inode *ni; 705 struct inode *inode; 706 707 ni = sbi->security.ni; 708 if (ni) { 709 inode = &ni->vfs_inode; 710 err2 = _ni_write_inode(inode, wait); 711 if (err2 && !err) 712 err = err2; 713 } 714 715 ni = sbi->objid.ni; 716 if (ni) { 717 inode = &ni->vfs_inode; 718 err2 = _ni_write_inode(inode, wait); 719 if (err2 && !err) 720 err = err2; 721 } 722 723 ni = sbi->reparse.ni; 724 if (ni) { 725 inode = &ni->vfs_inode; 726 err2 = _ni_write_inode(inode, wait); 727 if (err2 && !err) 728 err = err2; 729 } 730 731 if (!err) 732 ntfs_set_state(sbi, NTFS_DIRTY_CLEAR); 733 734 ntfs_update_mftmirr(sbi, wait); 735 736 return err; 737 } 738 739 static const struct super_operations ntfs_sops = { 740 .alloc_inode = ntfs_alloc_inode, 741 .free_inode = ntfs_free_inode, 742 .evict_inode = ntfs_evict_inode, 743 .put_super = ntfs_put_super, 744 .statfs = ntfs_statfs, 745 .show_options = ntfs_show_options, 746 .sync_fs = ntfs_sync_fs, 747 .write_inode = ntfs3_write_inode, 748 }; 749 750 static struct inode *ntfs_export_get_inode(struct super_block *sb, u64 ino, 751 u32 generation) 752 { 753 struct MFT_REF ref; 754 struct inode *inode; 755 756 ref.low = cpu_to_le32(ino); 757 #ifdef CONFIG_NTFS3_64BIT_CLUSTER 758 ref.high = cpu_to_le16(ino >> 32); 759 #else 760 ref.high = 0; 761 #endif 762 ref.seq = cpu_to_le16(generation); 763 764 inode = ntfs_iget5(sb, &ref, NULL); 765 if (!IS_ERR(inode) && is_bad_inode(inode)) { 766 iput(inode); 767 inode = ERR_PTR(-ESTALE); 768 } 769 770 return inode; 771 } 772 773 static struct dentry *ntfs_fh_to_dentry(struct super_block *sb, struct fid *fid, 774 int fh_len, int fh_type) 775 { 776 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 777 ntfs_export_get_inode); 778 } 779 780 static struct dentry *ntfs_fh_to_parent(struct super_block *sb, struct fid *fid, 781 int fh_len, int fh_type) 782 { 783 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 784 ntfs_export_get_inode); 785 } 786 787 /* TODO: == ntfs_sync_inode */ 788 static int ntfs_nfs_commit_metadata(struct inode *inode) 789 { 790 return _ni_write_inode(inode, 1); 791 } 792 793 static const struct export_operations ntfs_export_ops = { 794 .fh_to_dentry = ntfs_fh_to_dentry, 795 .fh_to_parent = ntfs_fh_to_parent, 796 .get_parent = ntfs3_get_parent, 797 .commit_metadata = ntfs_nfs_commit_metadata, 798 }; 799 800 /* 801 * format_size_gb - Return Gb,Mb to print with "%u.%02u Gb". 802 */ 803 static u32 format_size_gb(const u64 bytes, u32 *mb) 804 { 805 /* Do simple right 30 bit shift of 64 bit value. */ 806 u64 kbytes = bytes >> 10; 807 u32 kbytes32 = kbytes; 808 809 *mb = (100 * (kbytes32 & 0xfffff) + 0x7ffff) >> 20; 810 if (*mb >= 100) 811 *mb = 99; 812 813 return (kbytes32 >> 20) | (((u32)(kbytes >> 32)) << 12); 814 } 815 816 static u32 true_sectors_per_clst(const struct NTFS_BOOT *boot) 817 { 818 if (boot->sectors_per_clusters <= 0x80) 819 return boot->sectors_per_clusters; 820 if (boot->sectors_per_clusters >= 0xf4) /* limit shift to 2MB max */ 821 return 1U << (-(s8)boot->sectors_per_clusters); 822 return -EINVAL; 823 } 824 825 /* 826 * ntfs_init_from_boot - Init internal info from on-disk boot sector. 827 * 828 * NTFS mount begins from boot - special formatted 512 bytes. 829 * There are two boots: the first and the last 512 bytes of volume. 830 * The content of boot is not changed during ntfs life. 831 * 832 * NOTE: ntfs.sys checks only first (primary) boot. 833 * chkdsk checks both boots. 834 */ 835 static int ntfs_init_from_boot(struct super_block *sb, u32 sector_size, 836 u64 dev_size, struct NTFS_BOOT **boot2) 837 { 838 struct ntfs_sb_info *sbi = sb->s_fs_info; 839 int err; 840 u32 mb, gb, boot_sector_size, sct_per_clst, record_size; 841 u64 sectors, clusters, mlcn, mlcn2; 842 struct NTFS_BOOT *boot; 843 struct buffer_head *bh; 844 struct MFT_REC *rec; 845 u16 fn, ao; 846 u8 cluster_bits; 847 u32 boot_off = 0; 848 const char *hint = "Primary boot"; 849 850 sbi->volume.blocks = dev_size >> PAGE_SHIFT; 851 852 bh = ntfs_bread(sb, 0); 853 if (!bh) 854 return -EIO; 855 856 check_boot: 857 err = -EINVAL; 858 boot = (struct NTFS_BOOT *)Add2Ptr(bh->b_data, boot_off); 859 860 if (memcmp(boot->system_id, "NTFS ", sizeof("NTFS ") - 1)) { 861 ntfs_err(sb, "%s signature is not NTFS.", hint); 862 goto out; 863 } 864 865 /* 0x55AA is not mandaroty. Thanks Maxim Suhanov*/ 866 /*if (0x55 != boot->boot_magic[0] || 0xAA != boot->boot_magic[1]) 867 * goto out; 868 */ 869 870 boot_sector_size = ((u32)boot->bytes_per_sector[1] << 8) | 871 boot->bytes_per_sector[0]; 872 if (boot_sector_size < SECTOR_SIZE || 873 !is_power_of_2(boot_sector_size)) { 874 ntfs_err(sb, "%s: invalid bytes per sector %u.", hint, 875 boot_sector_size); 876 goto out; 877 } 878 879 /* cluster size: 512, 1K, 2K, 4K, ... 2M */ 880 sct_per_clst = true_sectors_per_clst(boot); 881 if ((int)sct_per_clst < 0 || !is_power_of_2(sct_per_clst)) { 882 ntfs_err(sb, "%s: invalid sectors per cluster %u.", hint, 883 sct_per_clst); 884 goto out; 885 } 886 887 sbi->cluster_size = boot_sector_size * sct_per_clst; 888 sbi->cluster_bits = cluster_bits = blksize_bits(sbi->cluster_size); 889 sbi->cluster_mask = sbi->cluster_size - 1; 890 sbi->cluster_mask_inv = ~(u64)sbi->cluster_mask; 891 892 mlcn = le64_to_cpu(boot->mft_clst); 893 mlcn2 = le64_to_cpu(boot->mft2_clst); 894 sectors = le64_to_cpu(boot->sectors_per_volume); 895 896 if (mlcn * sct_per_clst >= sectors || mlcn2 * sct_per_clst >= sectors) { 897 ntfs_err( 898 sb, 899 "%s: start of MFT 0x%llx (0x%llx) is out of volume 0x%llx.", 900 hint, mlcn, mlcn2, sectors); 901 goto out; 902 } 903 904 sbi->record_size = record_size = 905 boot->record_size < 0 ? 1 << (-boot->record_size) : 906 (u32)boot->record_size << cluster_bits; 907 sbi->record_bits = blksize_bits(record_size); 908 sbi->attr_size_tr = (5 * record_size >> 4); // ~320 bytes 909 910 /* Check MFT record size. */ 911 if (record_size < SECTOR_SIZE || !is_power_of_2(record_size)) { 912 ntfs_err(sb, "%s: invalid bytes per MFT record %u (%d).", hint, 913 record_size, boot->record_size); 914 goto out; 915 } 916 917 if (record_size > MAXIMUM_BYTES_PER_MFT) { 918 ntfs_err(sb, "Unsupported bytes per MFT record %u.", 919 record_size); 920 goto out; 921 } 922 923 sbi->index_size = boot->index_size < 0 ? 924 1u << (-boot->index_size) : 925 (u32)boot->index_size << cluster_bits; 926 927 /* Check index record size. */ 928 if (sbi->index_size < SECTOR_SIZE || !is_power_of_2(sbi->index_size)) { 929 ntfs_err(sb, "%s: invalid bytes per index %u(%d).", hint, 930 sbi->index_size, boot->index_size); 931 goto out; 932 } 933 934 if (sbi->index_size > MAXIMUM_BYTES_PER_INDEX) { 935 ntfs_err(sb, "%s: unsupported bytes per index %u.", hint, 936 sbi->index_size); 937 goto out; 938 } 939 940 sbi->volume.size = sectors * boot_sector_size; 941 942 gb = format_size_gb(sbi->volume.size + boot_sector_size, &mb); 943 944 /* 945 * - Volume formatted and mounted with the same sector size. 946 * - Volume formatted 4K and mounted as 512. 947 * - Volume formatted 512 and mounted as 4K. 948 */ 949 if (boot_sector_size != sector_size) { 950 ntfs_warn( 951 sb, 952 "Different NTFS sector size (%u) and media sector size (%u).", 953 boot_sector_size, sector_size); 954 dev_size += sector_size - 1; 955 } 956 957 sbi->mft.lbo = mlcn << cluster_bits; 958 sbi->mft.lbo2 = mlcn2 << cluster_bits; 959 960 /* Compare boot's cluster and sector. */ 961 if (sbi->cluster_size < boot_sector_size) { 962 ntfs_err(sb, "%s: invalid bytes per cluster (%u).", hint, 963 sbi->cluster_size); 964 goto out; 965 } 966 967 /* Compare boot's cluster and media sector. */ 968 if (sbi->cluster_size < sector_size) { 969 /* No way to use ntfs_get_block in this case. */ 970 ntfs_err( 971 sb, 972 "Failed to mount 'cause NTFS's cluster size (%u) is less than media sector size (%u).", 973 sbi->cluster_size, sector_size); 974 goto out; 975 } 976 977 sbi->max_bytes_per_attr = 978 record_size - ALIGN(MFTRECORD_FIXUP_OFFSET, 8) - 979 ALIGN(((record_size >> SECTOR_SHIFT) * sizeof(short)), 8) - 980 ALIGN(sizeof(enum ATTR_TYPE), 8); 981 982 sbi->volume.ser_num = le64_to_cpu(boot->serial_num); 983 984 /* Warning if RAW volume. */ 985 if (dev_size < sbi->volume.size + boot_sector_size) { 986 u32 mb0, gb0; 987 988 gb0 = format_size_gb(dev_size, &mb0); 989 ntfs_warn( 990 sb, 991 "RAW NTFS volume: Filesystem size %u.%02u Gb > volume size %u.%02u Gb. Mount in read-only.", 992 gb, mb, gb0, mb0); 993 sb->s_flags |= SB_RDONLY; 994 } 995 996 clusters = sbi->volume.size >> cluster_bits; 997 #ifndef CONFIG_NTFS3_64BIT_CLUSTER 998 /* 32 bits per cluster. */ 999 if (clusters >> 32) { 1000 ntfs_notice( 1001 sb, 1002 "NTFS %u.%02u Gb is too big to use 32 bits per cluster.", 1003 gb, mb); 1004 goto out; 1005 } 1006 #elif BITS_PER_LONG < 64 1007 #error "CONFIG_NTFS3_64BIT_CLUSTER incompatible in 32 bit OS" 1008 #endif 1009 1010 sbi->used.bitmap.nbits = clusters; 1011 1012 rec = kzalloc(record_size, GFP_NOFS); 1013 if (!rec) { 1014 err = -ENOMEM; 1015 goto out; 1016 } 1017 1018 sbi->new_rec = rec; 1019 rec->rhdr.sign = NTFS_FILE_SIGNATURE; 1020 rec->rhdr.fix_off = cpu_to_le16(MFTRECORD_FIXUP_OFFSET); 1021 fn = (sbi->record_size >> SECTOR_SHIFT) + 1; 1022 rec->rhdr.fix_num = cpu_to_le16(fn); 1023 ao = ALIGN(MFTRECORD_FIXUP_OFFSET + sizeof(short) * fn, 8); 1024 rec->attr_off = cpu_to_le16(ao); 1025 rec->used = cpu_to_le32(ao + ALIGN(sizeof(enum ATTR_TYPE), 8)); 1026 rec->total = cpu_to_le32(sbi->record_size); 1027 ((struct ATTRIB *)Add2Ptr(rec, ao))->type = ATTR_END; 1028 1029 sb_set_blocksize(sb, min_t(u32, sbi->cluster_size, PAGE_SIZE)); 1030 1031 sbi->block_mask = sb->s_blocksize - 1; 1032 sbi->blocks_per_cluster = sbi->cluster_size >> sb->s_blocksize_bits; 1033 sbi->volume.blocks = sbi->volume.size >> sb->s_blocksize_bits; 1034 1035 /* Maximum size for normal files. */ 1036 sbi->maxbytes = (clusters << cluster_bits) - 1; 1037 1038 #ifdef CONFIG_NTFS3_64BIT_CLUSTER 1039 if (clusters >= (1ull << (64 - cluster_bits))) 1040 sbi->maxbytes = -1; 1041 sbi->maxbytes_sparse = -1; 1042 sb->s_maxbytes = MAX_LFS_FILESIZE; 1043 #else 1044 /* Maximum size for sparse file. */ 1045 sbi->maxbytes_sparse = (1ull << (cluster_bits + 32)) - 1; 1046 sb->s_maxbytes = 0xFFFFFFFFull << cluster_bits; 1047 #endif 1048 1049 /* 1050 * Compute the MFT zone at two steps. 1051 * It would be nice if we are able to allocate 1/8 of 1052 * total clusters for MFT but not more then 512 MB. 1053 */ 1054 sbi->zone_max = min_t(CLST, 0x20000000 >> cluster_bits, clusters >> 3); 1055 1056 err = 0; 1057 1058 if (bh->b_blocknr && !sb_rdonly(sb)) { 1059 /* 1060 * Alternative boot is ok but primary is not ok. 1061 * Do not update primary boot here 'cause it may be faked boot. 1062 * Let ntfs to be mounted and update boot later. 1063 */ 1064 *boot2 = kmemdup(boot, sizeof(*boot), GFP_NOFS | __GFP_NOWARN); 1065 } 1066 1067 out: 1068 if (err == -EINVAL && !bh->b_blocknr && dev_size > PAGE_SHIFT) { 1069 u32 block_size = min_t(u32, sector_size, PAGE_SIZE); 1070 u64 lbo = dev_size - sizeof(*boot); 1071 1072 /* 1073 * Try alternative boot (last sector) 1074 */ 1075 brelse(bh); 1076 1077 sb_set_blocksize(sb, block_size); 1078 bh = ntfs_bread(sb, lbo >> blksize_bits(block_size)); 1079 if (!bh) 1080 return -EINVAL; 1081 1082 boot_off = lbo & (block_size - 1); 1083 hint = "Alternative boot"; 1084 goto check_boot; 1085 } 1086 brelse(bh); 1087 1088 return err; 1089 } 1090 1091 /* 1092 * ntfs_fill_super - Try to mount. 1093 */ 1094 static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc) 1095 { 1096 int err; 1097 struct ntfs_sb_info *sbi = sb->s_fs_info; 1098 struct block_device *bdev = sb->s_bdev; 1099 struct ntfs_mount_options *options; 1100 struct inode *inode; 1101 struct ntfs_inode *ni; 1102 size_t i, tt, bad_len, bad_frags; 1103 CLST vcn, lcn, len; 1104 struct ATTRIB *attr; 1105 const struct VOLUME_INFO *info; 1106 u32 idx, done, bytes; 1107 struct ATTR_DEF_ENTRY *t; 1108 u16 *shared; 1109 struct MFT_REF ref; 1110 bool ro = sb_rdonly(sb); 1111 struct NTFS_BOOT *boot2 = NULL; 1112 1113 ref.high = 0; 1114 1115 sbi->sb = sb; 1116 sbi->options = options = fc->fs_private; 1117 fc->fs_private = NULL; 1118 sb->s_flags |= SB_NODIRATIME; 1119 sb->s_magic = 0x7366746e; // "ntfs" 1120 sb->s_op = &ntfs_sops; 1121 sb->s_export_op = &ntfs_export_ops; 1122 sb->s_time_gran = NTFS_TIME_GRAN; // 100 nsec 1123 sb->s_xattr = ntfs_xattr_handlers; 1124 sb->s_d_op = options->nocase ? &ntfs_dentry_ops : NULL; 1125 1126 options->nls = ntfs_load_nls(options->nls_name); 1127 if (IS_ERR(options->nls)) { 1128 options->nls = NULL; 1129 errorf(fc, "Cannot load nls %s", options->nls_name); 1130 err = -EINVAL; 1131 goto out; 1132 } 1133 1134 if (bdev_max_discard_sectors(bdev) && bdev_discard_granularity(bdev)) { 1135 sbi->discard_granularity = bdev_discard_granularity(bdev); 1136 sbi->discard_granularity_mask_inv = 1137 ~(u64)(sbi->discard_granularity - 1); 1138 } 1139 1140 /* Parse boot. */ 1141 err = ntfs_init_from_boot(sb, bdev_logical_block_size(bdev), 1142 bdev_nr_bytes(bdev), &boot2); 1143 if (err) 1144 goto out; 1145 1146 /* 1147 * Load $Volume. This should be done before $LogFile 1148 * 'cause 'sbi->volume.ni' is used 'ntfs_set_state'. 1149 */ 1150 ref.low = cpu_to_le32(MFT_REC_VOL); 1151 ref.seq = cpu_to_le16(MFT_REC_VOL); 1152 inode = ntfs_iget5(sb, &ref, &NAME_VOLUME); 1153 if (IS_ERR(inode)) { 1154 err = PTR_ERR(inode); 1155 ntfs_err(sb, "Failed to load $Volume (%d).", err); 1156 goto out; 1157 } 1158 1159 ni = ntfs_i(inode); 1160 1161 /* Load and save label (not necessary). */ 1162 attr = ni_find_attr(ni, NULL, NULL, ATTR_LABEL, NULL, 0, NULL, NULL); 1163 1164 if (!attr) { 1165 /* It is ok if no ATTR_LABEL */ 1166 } else if (!attr->non_res && !is_attr_ext(attr)) { 1167 /* $AttrDef allows labels to be up to 128 symbols. */ 1168 err = utf16s_to_utf8s(resident_data(attr), 1169 le32_to_cpu(attr->res.data_size) >> 1, 1170 UTF16_LITTLE_ENDIAN, sbi->volume.label, 1171 sizeof(sbi->volume.label)); 1172 if (err < 0) 1173 sbi->volume.label[0] = 0; 1174 } else { 1175 /* Should we break mounting here? */ 1176 //err = -EINVAL; 1177 //goto put_inode_out; 1178 } 1179 1180 attr = ni_find_attr(ni, attr, NULL, ATTR_VOL_INFO, NULL, 0, NULL, NULL); 1181 if (!attr || is_attr_ext(attr) || 1182 !(info = resident_data_ex(attr, SIZEOF_ATTRIBUTE_VOLUME_INFO))) { 1183 ntfs_err(sb, "$Volume is corrupted."); 1184 err = -EINVAL; 1185 goto put_inode_out; 1186 } 1187 1188 sbi->volume.major_ver = info->major_ver; 1189 sbi->volume.minor_ver = info->minor_ver; 1190 sbi->volume.flags = info->flags; 1191 sbi->volume.ni = ni; 1192 if (info->flags & VOLUME_FLAG_DIRTY) { 1193 sbi->volume.real_dirty = true; 1194 ntfs_info(sb, "It is recommened to use chkdsk."); 1195 } 1196 1197 /* Load $MFTMirr to estimate recs_mirr. */ 1198 ref.low = cpu_to_le32(MFT_REC_MIRR); 1199 ref.seq = cpu_to_le16(MFT_REC_MIRR); 1200 inode = ntfs_iget5(sb, &ref, &NAME_MIRROR); 1201 if (IS_ERR(inode)) { 1202 err = PTR_ERR(inode); 1203 ntfs_err(sb, "Failed to load $MFTMirr (%d).", err); 1204 goto out; 1205 } 1206 1207 sbi->mft.recs_mirr = ntfs_up_cluster(sbi, inode->i_size) >> 1208 sbi->record_bits; 1209 1210 iput(inode); 1211 1212 /* Load LogFile to replay. */ 1213 ref.low = cpu_to_le32(MFT_REC_LOG); 1214 ref.seq = cpu_to_le16(MFT_REC_LOG); 1215 inode = ntfs_iget5(sb, &ref, &NAME_LOGFILE); 1216 if (IS_ERR(inode)) { 1217 err = PTR_ERR(inode); 1218 ntfs_err(sb, "Failed to load \x24LogFile (%d).", err); 1219 goto out; 1220 } 1221 1222 ni = ntfs_i(inode); 1223 1224 err = ntfs_loadlog_and_replay(ni, sbi); 1225 if (err) 1226 goto put_inode_out; 1227 1228 iput(inode); 1229 1230 if ((sbi->flags & NTFS_FLAGS_NEED_REPLAY) && !ro) { 1231 ntfs_warn(sb, "failed to replay log file. Can't mount rw!"); 1232 err = -EINVAL; 1233 goto out; 1234 } 1235 1236 if ((sbi->volume.flags & VOLUME_FLAG_DIRTY) && !ro && !options->force) { 1237 ntfs_warn(sb, "volume is dirty and \"force\" flag is not set!"); 1238 err = -EINVAL; 1239 goto out; 1240 } 1241 1242 /* Load $MFT. */ 1243 ref.low = cpu_to_le32(MFT_REC_MFT); 1244 ref.seq = cpu_to_le16(1); 1245 1246 inode = ntfs_iget5(sb, &ref, &NAME_MFT); 1247 if (IS_ERR(inode)) { 1248 err = PTR_ERR(inode); 1249 ntfs_err(sb, "Failed to load $MFT (%d).", err); 1250 goto out; 1251 } 1252 1253 ni = ntfs_i(inode); 1254 1255 sbi->mft.used = ni->i_valid >> sbi->record_bits; 1256 tt = inode->i_size >> sbi->record_bits; 1257 sbi->mft.next_free = MFT_REC_USER; 1258 1259 err = wnd_init(&sbi->mft.bitmap, sb, tt); 1260 if (err) 1261 goto put_inode_out; 1262 1263 err = ni_load_all_mi(ni); 1264 if (err) { 1265 ntfs_err(sb, "Failed to load $MFT's subrecords (%d).", err); 1266 goto put_inode_out; 1267 } 1268 1269 sbi->mft.ni = ni; 1270 1271 /* Load $Bitmap. */ 1272 ref.low = cpu_to_le32(MFT_REC_BITMAP); 1273 ref.seq = cpu_to_le16(MFT_REC_BITMAP); 1274 inode = ntfs_iget5(sb, &ref, &NAME_BITMAP); 1275 if (IS_ERR(inode)) { 1276 err = PTR_ERR(inode); 1277 ntfs_err(sb, "Failed to load $Bitmap (%d).", err); 1278 goto out; 1279 } 1280 1281 #ifndef CONFIG_NTFS3_64BIT_CLUSTER 1282 if (inode->i_size >> 32) { 1283 err = -EINVAL; 1284 goto put_inode_out; 1285 } 1286 #endif 1287 1288 /* Check bitmap boundary. */ 1289 tt = sbi->used.bitmap.nbits; 1290 if (inode->i_size < bitmap_size(tt)) { 1291 ntfs_err(sb, "$Bitmap is corrupted."); 1292 err = -EINVAL; 1293 goto put_inode_out; 1294 } 1295 1296 err = wnd_init(&sbi->used.bitmap, sb, tt); 1297 if (err) { 1298 ntfs_err(sb, "Failed to initialize $Bitmap (%d).", err); 1299 goto put_inode_out; 1300 } 1301 1302 iput(inode); 1303 1304 /* Compute the MFT zone. */ 1305 err = ntfs_refresh_zone(sbi); 1306 if (err) { 1307 ntfs_err(sb, "Failed to initialize MFT zone (%d).", err); 1308 goto out; 1309 } 1310 1311 /* Load $BadClus. */ 1312 ref.low = cpu_to_le32(MFT_REC_BADCLUST); 1313 ref.seq = cpu_to_le16(MFT_REC_BADCLUST); 1314 inode = ntfs_iget5(sb, &ref, &NAME_BADCLUS); 1315 if (IS_ERR(inode)) { 1316 err = PTR_ERR(inode); 1317 ntfs_err(sb, "Failed to load $BadClus (%d).", err); 1318 goto out; 1319 } 1320 1321 ni = ntfs_i(inode); 1322 bad_len = bad_frags = 0; 1323 for (i = 0; run_get_entry(&ni->file.run, i, &vcn, &lcn, &len); i++) { 1324 if (lcn == SPARSE_LCN) 1325 continue; 1326 1327 bad_len += len; 1328 bad_frags += 1; 1329 if (ro) 1330 continue; 1331 1332 if (wnd_set_used_safe(&sbi->used.bitmap, lcn, len, &tt) || tt) { 1333 /* Bad blocks marked as free in bitmap. */ 1334 ntfs_set_state(sbi, NTFS_DIRTY_ERROR); 1335 } 1336 } 1337 if (bad_len) { 1338 /* 1339 * Notice about bad blocks. 1340 * In normal cases these blocks are marked as used in bitmap. 1341 * And we never allocate space in it. 1342 */ 1343 ntfs_notice(sb, 1344 "Volume contains %zu bad blocks in %zu fragments.", 1345 bad_len, bad_frags); 1346 } 1347 iput(inode); 1348 1349 /* Load $AttrDef. */ 1350 ref.low = cpu_to_le32(MFT_REC_ATTR); 1351 ref.seq = cpu_to_le16(MFT_REC_ATTR); 1352 inode = ntfs_iget5(sb, &ref, &NAME_ATTRDEF); 1353 if (IS_ERR(inode)) { 1354 err = PTR_ERR(inode); 1355 ntfs_err(sb, "Failed to load $AttrDef (%d)", err); 1356 goto out; 1357 } 1358 1359 /* 1360 * Typical $AttrDef contains up to 20 entries. 1361 * Check for extremely large/small size. 1362 */ 1363 if (inode->i_size < sizeof(struct ATTR_DEF_ENTRY) || 1364 inode->i_size > 100 * sizeof(struct ATTR_DEF_ENTRY)) { 1365 ntfs_err(sb, "Looks like $AttrDef is corrupted (size=%llu).", 1366 inode->i_size); 1367 err = -EINVAL; 1368 goto put_inode_out; 1369 } 1370 1371 bytes = inode->i_size; 1372 sbi->def_table = t = kmalloc(bytes, GFP_NOFS | __GFP_NOWARN); 1373 if (!t) { 1374 err = -ENOMEM; 1375 goto put_inode_out; 1376 } 1377 1378 for (done = idx = 0; done < bytes; done += PAGE_SIZE, idx++) { 1379 unsigned long tail = bytes - done; 1380 struct page *page = ntfs_map_page(inode->i_mapping, idx); 1381 1382 if (IS_ERR(page)) { 1383 err = PTR_ERR(page); 1384 ntfs_err(sb, "Failed to read $AttrDef (%d).", err); 1385 goto put_inode_out; 1386 } 1387 memcpy(Add2Ptr(t, done), page_address(page), 1388 min(PAGE_SIZE, tail)); 1389 ntfs_unmap_page(page); 1390 1391 if (!idx && ATTR_STD != t->type) { 1392 ntfs_err(sb, "$AttrDef is corrupted."); 1393 err = -EINVAL; 1394 goto put_inode_out; 1395 } 1396 } 1397 1398 t += 1; 1399 sbi->def_entries = 1; 1400 done = sizeof(struct ATTR_DEF_ENTRY); 1401 sbi->reparse.max_size = MAXIMUM_REPARSE_DATA_BUFFER_SIZE; 1402 sbi->ea_max_size = 0x10000; /* default formatter value */ 1403 1404 while (done + sizeof(struct ATTR_DEF_ENTRY) <= bytes) { 1405 u32 t32 = le32_to_cpu(t->type); 1406 u64 sz = le64_to_cpu(t->max_sz); 1407 1408 if ((t32 & 0xF) || le32_to_cpu(t[-1].type) >= t32) 1409 break; 1410 1411 if (t->type == ATTR_REPARSE) 1412 sbi->reparse.max_size = sz; 1413 else if (t->type == ATTR_EA) 1414 sbi->ea_max_size = sz; 1415 1416 done += sizeof(struct ATTR_DEF_ENTRY); 1417 t += 1; 1418 sbi->def_entries += 1; 1419 } 1420 iput(inode); 1421 1422 /* Load $UpCase. */ 1423 ref.low = cpu_to_le32(MFT_REC_UPCASE); 1424 ref.seq = cpu_to_le16(MFT_REC_UPCASE); 1425 inode = ntfs_iget5(sb, &ref, &NAME_UPCASE); 1426 if (IS_ERR(inode)) { 1427 err = PTR_ERR(inode); 1428 ntfs_err(sb, "Failed to load $UpCase (%d).", err); 1429 goto out; 1430 } 1431 1432 if (inode->i_size != 0x10000 * sizeof(short)) { 1433 err = -EINVAL; 1434 ntfs_err(sb, "$UpCase is corrupted."); 1435 goto put_inode_out; 1436 } 1437 1438 for (idx = 0; idx < (0x10000 * sizeof(short) >> PAGE_SHIFT); idx++) { 1439 const __le16 *src; 1440 u16 *dst = Add2Ptr(sbi->upcase, idx << PAGE_SHIFT); 1441 struct page *page = ntfs_map_page(inode->i_mapping, idx); 1442 1443 if (IS_ERR(page)) { 1444 err = PTR_ERR(page); 1445 ntfs_err(sb, "Failed to read $UpCase (%d).", err); 1446 goto put_inode_out; 1447 } 1448 1449 src = page_address(page); 1450 1451 #ifdef __BIG_ENDIAN 1452 for (i = 0; i < PAGE_SIZE / sizeof(u16); i++) 1453 *dst++ = le16_to_cpu(*src++); 1454 #else 1455 memcpy(dst, src, PAGE_SIZE); 1456 #endif 1457 ntfs_unmap_page(page); 1458 } 1459 1460 shared = ntfs_set_shared(sbi->upcase, 0x10000 * sizeof(short)); 1461 if (shared && sbi->upcase != shared) { 1462 kvfree(sbi->upcase); 1463 sbi->upcase = shared; 1464 } 1465 1466 iput(inode); 1467 1468 if (is_ntfs3(sbi)) { 1469 /* Load $Secure. */ 1470 err = ntfs_security_init(sbi); 1471 if (err) { 1472 ntfs_err(sb, "Failed to initialize $Secure (%d).", err); 1473 goto out; 1474 } 1475 1476 /* Load $Extend. */ 1477 err = ntfs_extend_init(sbi); 1478 if (err) { 1479 ntfs_warn(sb, "Failed to initialize $Extend."); 1480 goto load_root; 1481 } 1482 1483 /* Load $Extend/$Reparse. */ 1484 err = ntfs_reparse_init(sbi); 1485 if (err) { 1486 ntfs_warn(sb, "Failed to initialize $Extend/$Reparse."); 1487 goto load_root; 1488 } 1489 1490 /* Load $Extend/$ObjId. */ 1491 err = ntfs_objid_init(sbi); 1492 if (err) { 1493 ntfs_warn(sb, "Failed to initialize $Extend/$ObjId."); 1494 goto load_root; 1495 } 1496 } 1497 1498 load_root: 1499 /* Load root. */ 1500 ref.low = cpu_to_le32(MFT_REC_ROOT); 1501 ref.seq = cpu_to_le16(MFT_REC_ROOT); 1502 inode = ntfs_iget5(sb, &ref, &NAME_ROOT); 1503 if (IS_ERR(inode)) { 1504 err = PTR_ERR(inode); 1505 ntfs_err(sb, "Failed to load root (%d).", err); 1506 goto out; 1507 } 1508 1509 /* 1510 * Final check. Looks like this case should never occurs. 1511 */ 1512 if (!inode->i_op) { 1513 err = -EINVAL; 1514 ntfs_err(sb, "Failed to load root (%d).", err); 1515 goto put_inode_out; 1516 } 1517 1518 sb->s_root = d_make_root(inode); 1519 if (!sb->s_root) { 1520 err = -ENOMEM; 1521 goto put_inode_out; 1522 } 1523 1524 if (boot2) { 1525 /* 1526 * Alternative boot is ok but primary is not ok. 1527 * Volume is recognized as NTFS. Update primary boot. 1528 */ 1529 struct buffer_head *bh0 = sb_getblk(sb, 0); 1530 if (bh0) { 1531 if (buffer_locked(bh0)) 1532 __wait_on_buffer(bh0); 1533 1534 lock_buffer(bh0); 1535 memcpy(bh0->b_data, boot2, sizeof(*boot2)); 1536 set_buffer_uptodate(bh0); 1537 mark_buffer_dirty(bh0); 1538 unlock_buffer(bh0); 1539 if (!sync_dirty_buffer(bh0)) 1540 ntfs_warn(sb, "primary boot is updated"); 1541 put_bh(bh0); 1542 } 1543 1544 kfree(boot2); 1545 } 1546 1547 #ifdef CONFIG_PROC_FS 1548 /* Create /proc/fs/ntfs3/.. */ 1549 if (proc_info_root) { 1550 struct proc_dir_entry *e = proc_mkdir(sb->s_id, proc_info_root); 1551 static_assert((S_IRUGO | S_IWUSR) == 0644); 1552 if (e) { 1553 proc_create_data("volinfo", S_IRUGO, e, 1554 &ntfs3_volinfo_fops, sb); 1555 proc_create_data("label", S_IRUGO | S_IWUSR, e, 1556 &ntfs3_label_fops, sb); 1557 sbi->procdir = e; 1558 } 1559 } 1560 #endif 1561 1562 return 0; 1563 1564 put_inode_out: 1565 iput(inode); 1566 out: 1567 /* 1568 * Free resources here. 1569 * ntfs_fs_free will be called with fc->s_fs_info = NULL 1570 */ 1571 put_mount_options(sbi->options); 1572 put_ntfs(sbi); 1573 sb->s_fs_info = NULL; 1574 kfree(boot2); 1575 1576 return err; 1577 } 1578 1579 void ntfs_unmap_meta(struct super_block *sb, CLST lcn, CLST len) 1580 { 1581 struct ntfs_sb_info *sbi = sb->s_fs_info; 1582 struct block_device *bdev = sb->s_bdev; 1583 sector_t devblock = (u64)lcn * sbi->blocks_per_cluster; 1584 unsigned long blocks = (u64)len * sbi->blocks_per_cluster; 1585 unsigned long cnt = 0; 1586 unsigned long limit = global_zone_page_state(NR_FREE_PAGES) 1587 << (PAGE_SHIFT - sb->s_blocksize_bits); 1588 1589 if (limit >= 0x2000) 1590 limit -= 0x1000; 1591 else if (limit < 32) 1592 limit = 32; 1593 else 1594 limit >>= 1; 1595 1596 while (blocks--) { 1597 clean_bdev_aliases(bdev, devblock++, 1); 1598 if (cnt++ >= limit) { 1599 sync_blockdev(bdev); 1600 cnt = 0; 1601 } 1602 } 1603 } 1604 1605 /* 1606 * ntfs_discard - Issue a discard request (trim for SSD). 1607 */ 1608 int ntfs_discard(struct ntfs_sb_info *sbi, CLST lcn, CLST len) 1609 { 1610 int err; 1611 u64 lbo, bytes, start, end; 1612 struct super_block *sb; 1613 1614 if (sbi->used.next_free_lcn == lcn + len) 1615 sbi->used.next_free_lcn = lcn; 1616 1617 if (sbi->flags & NTFS_FLAGS_NODISCARD) 1618 return -EOPNOTSUPP; 1619 1620 if (!sbi->options->discard) 1621 return -EOPNOTSUPP; 1622 1623 lbo = (u64)lcn << sbi->cluster_bits; 1624 bytes = (u64)len << sbi->cluster_bits; 1625 1626 /* Align up 'start' on discard_granularity. */ 1627 start = (lbo + sbi->discard_granularity - 1) & 1628 sbi->discard_granularity_mask_inv; 1629 /* Align down 'end' on discard_granularity. */ 1630 end = (lbo + bytes) & sbi->discard_granularity_mask_inv; 1631 1632 sb = sbi->sb; 1633 if (start >= end) 1634 return 0; 1635 1636 err = blkdev_issue_discard(sb->s_bdev, start >> 9, (end - start) >> 9, 1637 GFP_NOFS); 1638 1639 if (err == -EOPNOTSUPP) 1640 sbi->flags |= NTFS_FLAGS_NODISCARD; 1641 1642 return err; 1643 } 1644 1645 static int ntfs_fs_get_tree(struct fs_context *fc) 1646 { 1647 return get_tree_bdev(fc, ntfs_fill_super); 1648 } 1649 1650 /* 1651 * ntfs_fs_free - Free fs_context. 1652 * 1653 * Note that this will be called after fill_super and reconfigure 1654 * even when they pass. So they have to take pointers if they pass. 1655 */ 1656 static void ntfs_fs_free(struct fs_context *fc) 1657 { 1658 struct ntfs_mount_options *opts = fc->fs_private; 1659 struct ntfs_sb_info *sbi = fc->s_fs_info; 1660 1661 if (sbi) 1662 put_ntfs(sbi); 1663 1664 if (opts) 1665 put_mount_options(opts); 1666 } 1667 1668 // clang-format off 1669 static const struct fs_context_operations ntfs_context_ops = { 1670 .parse_param = ntfs_fs_parse_param, 1671 .get_tree = ntfs_fs_get_tree, 1672 .reconfigure = ntfs_fs_reconfigure, 1673 .free = ntfs_fs_free, 1674 }; 1675 // clang-format on 1676 1677 /* 1678 * ntfs_init_fs_context - Initialize sbi and opts 1679 * 1680 * This will called when mount/remount. We will first initialize 1681 * options so that if remount we can use just that. 1682 */ 1683 static int ntfs_init_fs_context(struct fs_context *fc) 1684 { 1685 struct ntfs_mount_options *opts; 1686 struct ntfs_sb_info *sbi; 1687 1688 opts = kzalloc(sizeof(struct ntfs_mount_options), GFP_NOFS); 1689 if (!opts) 1690 return -ENOMEM; 1691 1692 /* Default options. */ 1693 opts->fs_uid = current_uid(); 1694 opts->fs_gid = current_gid(); 1695 opts->fs_fmask_inv = ~current_umask(); 1696 opts->fs_dmask_inv = ~current_umask(); 1697 1698 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) 1699 goto ok; 1700 1701 sbi = kzalloc(sizeof(struct ntfs_sb_info), GFP_NOFS); 1702 if (!sbi) 1703 goto free_opts; 1704 1705 sbi->upcase = kvmalloc(0x10000 * sizeof(short), GFP_KERNEL); 1706 if (!sbi->upcase) 1707 goto free_sbi; 1708 1709 ratelimit_state_init(&sbi->msg_ratelimit, DEFAULT_RATELIMIT_INTERVAL, 1710 DEFAULT_RATELIMIT_BURST); 1711 1712 mutex_init(&sbi->compress.mtx_lznt); 1713 #ifdef CONFIG_NTFS3_LZX_XPRESS 1714 mutex_init(&sbi->compress.mtx_xpress); 1715 mutex_init(&sbi->compress.mtx_lzx); 1716 #endif 1717 1718 fc->s_fs_info = sbi; 1719 ok: 1720 fc->fs_private = opts; 1721 fc->ops = &ntfs_context_ops; 1722 1723 return 0; 1724 free_sbi: 1725 kfree(sbi); 1726 free_opts: 1727 kfree(opts); 1728 return -ENOMEM; 1729 } 1730 1731 // clang-format off 1732 static struct file_system_type ntfs_fs_type = { 1733 .owner = THIS_MODULE, 1734 .name = "ntfs3", 1735 .init_fs_context = ntfs_init_fs_context, 1736 .parameters = ntfs_fs_parameters, 1737 .kill_sb = kill_block_super, 1738 .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP, 1739 }; 1740 // clang-format on 1741 1742 static int __init init_ntfs_fs(void) 1743 { 1744 int err; 1745 1746 pr_info("ntfs3: Max link count %u\n", NTFS_LINK_MAX); 1747 1748 if (IS_ENABLED(CONFIG_NTFS3_FS_POSIX_ACL)) 1749 pr_info("ntfs3: Enabled Linux POSIX ACLs support\n"); 1750 if (IS_ENABLED(CONFIG_NTFS3_64BIT_CLUSTER)) 1751 pr_notice( 1752 "ntfs3: Warning: Activated 64 bits per cluster. Windows does not support this\n"); 1753 if (IS_ENABLED(CONFIG_NTFS3_LZX_XPRESS)) 1754 pr_info("ntfs3: Read-only LZX/Xpress compression included\n"); 1755 1756 1757 #ifdef CONFIG_PROC_FS 1758 /* Create "/proc/fs/ntfs3" */ 1759 proc_info_root = proc_mkdir("fs/ntfs3", NULL); 1760 #endif 1761 1762 err = ntfs3_init_bitmap(); 1763 if (err) 1764 return err; 1765 1766 ntfs_inode_cachep = kmem_cache_create( 1767 "ntfs_inode_cache", sizeof(struct ntfs_inode), 0, 1768 (SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD | SLAB_ACCOUNT), 1769 init_once); 1770 if (!ntfs_inode_cachep) { 1771 err = -ENOMEM; 1772 goto out1; 1773 } 1774 1775 err = register_filesystem(&ntfs_fs_type); 1776 if (err) 1777 goto out; 1778 1779 return 0; 1780 out: 1781 kmem_cache_destroy(ntfs_inode_cachep); 1782 out1: 1783 ntfs3_exit_bitmap(); 1784 return err; 1785 } 1786 1787 static void __exit exit_ntfs_fs(void) 1788 { 1789 rcu_barrier(); 1790 kmem_cache_destroy(ntfs_inode_cachep); 1791 unregister_filesystem(&ntfs_fs_type); 1792 ntfs3_exit_bitmap(); 1793 1794 #ifdef CONFIG_PROC_FS 1795 if (proc_info_root) 1796 remove_proc_entry("fs/ntfs3", NULL); 1797 #endif 1798 1799 } 1800 1801 MODULE_LICENSE("GPL"); 1802 MODULE_DESCRIPTION("ntfs3 read/write filesystem"); 1803 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 1804 MODULE_INFO(behaviour, "Enabled Linux POSIX ACLs support"); 1805 #endif 1806 #ifdef CONFIG_NTFS3_64BIT_CLUSTER 1807 MODULE_INFO( 1808 cluster, 1809 "Warning: Activated 64 bits per cluster. Windows does not support this"); 1810 #endif 1811 #ifdef CONFIG_NTFS3_LZX_XPRESS 1812 MODULE_INFO(compression, "Read-only lzx/xpress compression included"); 1813 #endif 1814 1815 MODULE_AUTHOR("Konstantin Komarov"); 1816 MODULE_ALIAS_FS("ntfs3"); 1817 1818 module_init(init_ntfs_fs); 1819 module_exit(exit_ntfs_fs); 1820