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_put_sbi(struct ntfs_sb_info *sbi) 575 { 576 wnd_close(&sbi->mft.bitmap); 577 wnd_close(&sbi->used.bitmap); 578 579 if (sbi->mft.ni) 580 iput(&sbi->mft.ni->vfs_inode); 581 582 if (sbi->security.ni) 583 iput(&sbi->security.ni->vfs_inode); 584 585 if (sbi->reparse.ni) 586 iput(&sbi->reparse.ni->vfs_inode); 587 588 if (sbi->objid.ni) 589 iput(&sbi->objid.ni->vfs_inode); 590 591 if (sbi->volume.ni) 592 iput(&sbi->volume.ni->vfs_inode); 593 594 ntfs_update_mftmirr(sbi, 0); 595 596 indx_clear(&sbi->security.index_sii); 597 indx_clear(&sbi->security.index_sdh); 598 indx_clear(&sbi->reparse.index_r); 599 indx_clear(&sbi->objid.index_o); 600 } 601 602 static void ntfs3_free_sbi(struct ntfs_sb_info *sbi) 603 { 604 kfree(sbi->new_rec); 605 kvfree(ntfs_put_shared(sbi->upcase)); 606 kfree(sbi->def_table); 607 kfree(sbi->compress.lznt); 608 #ifdef CONFIG_NTFS3_LZX_XPRESS 609 xpress_free_decompressor(sbi->compress.xpress); 610 lzx_free_decompressor(sbi->compress.lzx); 611 #endif 612 kfree(sbi); 613 } 614 615 static void ntfs_put_super(struct super_block *sb) 616 { 617 struct ntfs_sb_info *sbi = sb->s_fs_info; 618 619 #ifdef CONFIG_PROC_FS 620 // Remove /proc/fs/ntfs3/.. 621 if (sbi->procdir) { 622 remove_proc_entry("label", sbi->procdir); 623 remove_proc_entry("volinfo", sbi->procdir); 624 remove_proc_entry(sb->s_id, proc_info_root); 625 sbi->procdir = NULL; 626 } 627 #endif 628 629 /* Mark rw ntfs as clear, if possible. */ 630 ntfs_set_state(sbi, NTFS_DIRTY_CLEAR); 631 ntfs3_put_sbi(sbi); 632 } 633 634 static int ntfs_statfs(struct dentry *dentry, struct kstatfs *buf) 635 { 636 struct super_block *sb = dentry->d_sb; 637 struct ntfs_sb_info *sbi = sb->s_fs_info; 638 struct wnd_bitmap *wnd = &sbi->used.bitmap; 639 640 buf->f_type = sb->s_magic; 641 buf->f_bsize = sbi->cluster_size; 642 buf->f_blocks = wnd->nbits; 643 644 buf->f_bfree = buf->f_bavail = wnd_zeroes(wnd); 645 buf->f_fsid.val[0] = sbi->volume.ser_num; 646 buf->f_fsid.val[1] = (sbi->volume.ser_num >> 32); 647 buf->f_namelen = NTFS_NAME_LEN; 648 649 return 0; 650 } 651 652 static int ntfs_show_options(struct seq_file *m, struct dentry *root) 653 { 654 struct super_block *sb = root->d_sb; 655 struct ntfs_sb_info *sbi = sb->s_fs_info; 656 struct ntfs_mount_options *opts = sbi->options; 657 struct user_namespace *user_ns = seq_user_ns(m); 658 659 seq_printf(m, ",uid=%u", from_kuid_munged(user_ns, opts->fs_uid)); 660 seq_printf(m, ",gid=%u", from_kgid_munged(user_ns, opts->fs_gid)); 661 if (opts->dmask) 662 seq_printf(m, ",dmask=%04o", opts->fs_dmask_inv ^ 0xffff); 663 if (opts->fmask) 664 seq_printf(m, ",fmask=%04o", opts->fs_fmask_inv ^ 0xffff); 665 if (opts->sys_immutable) 666 seq_puts(m, ",sys_immutable"); 667 if (opts->discard) 668 seq_puts(m, ",discard"); 669 if (opts->force) 670 seq_puts(m, ",force"); 671 if (opts->sparse) 672 seq_puts(m, ",sparse"); 673 if (opts->nohidden) 674 seq_puts(m, ",nohidden"); 675 if (opts->hide_dot_files) 676 seq_puts(m, ",hide_dot_files"); 677 if (opts->windows_names) 678 seq_puts(m, ",windows_names"); 679 if (opts->showmeta) 680 seq_puts(m, ",showmeta"); 681 if (sb->s_flags & SB_POSIXACL) 682 seq_puts(m, ",acl"); 683 if (opts->nls) 684 seq_printf(m, ",iocharset=%s", opts->nls->charset); 685 else 686 seq_puts(m, ",iocharset=utf8"); 687 if (opts->prealloc) 688 seq_puts(m, ",prealloc"); 689 if (opts->nocase) 690 seq_puts(m, ",nocase"); 691 692 return 0; 693 } 694 695 /* 696 * ntfs_sync_fs - super_operations::sync_fs 697 */ 698 static int ntfs_sync_fs(struct super_block *sb, int wait) 699 { 700 int err = 0, err2; 701 struct ntfs_sb_info *sbi = sb->s_fs_info; 702 struct ntfs_inode *ni; 703 struct inode *inode; 704 705 ni = sbi->security.ni; 706 if (ni) { 707 inode = &ni->vfs_inode; 708 err2 = _ni_write_inode(inode, wait); 709 if (err2 && !err) 710 err = err2; 711 } 712 713 ni = sbi->objid.ni; 714 if (ni) { 715 inode = &ni->vfs_inode; 716 err2 = _ni_write_inode(inode, wait); 717 if (err2 && !err) 718 err = err2; 719 } 720 721 ni = sbi->reparse.ni; 722 if (ni) { 723 inode = &ni->vfs_inode; 724 err2 = _ni_write_inode(inode, wait); 725 if (err2 && !err) 726 err = err2; 727 } 728 729 if (!err) 730 ntfs_set_state(sbi, NTFS_DIRTY_CLEAR); 731 732 ntfs_update_mftmirr(sbi, wait); 733 734 return err; 735 } 736 737 static const struct super_operations ntfs_sops = { 738 .alloc_inode = ntfs_alloc_inode, 739 .free_inode = ntfs_free_inode, 740 .evict_inode = ntfs_evict_inode, 741 .put_super = ntfs_put_super, 742 .statfs = ntfs_statfs, 743 .show_options = ntfs_show_options, 744 .sync_fs = ntfs_sync_fs, 745 .write_inode = ntfs3_write_inode, 746 }; 747 748 static struct inode *ntfs_export_get_inode(struct super_block *sb, u64 ino, 749 u32 generation) 750 { 751 struct MFT_REF ref; 752 struct inode *inode; 753 754 ref.low = cpu_to_le32(ino); 755 #ifdef CONFIG_NTFS3_64BIT_CLUSTER 756 ref.high = cpu_to_le16(ino >> 32); 757 #else 758 ref.high = 0; 759 #endif 760 ref.seq = cpu_to_le16(generation); 761 762 inode = ntfs_iget5(sb, &ref, NULL); 763 if (!IS_ERR(inode) && is_bad_inode(inode)) { 764 iput(inode); 765 inode = ERR_PTR(-ESTALE); 766 } 767 768 return inode; 769 } 770 771 static struct dentry *ntfs_fh_to_dentry(struct super_block *sb, struct fid *fid, 772 int fh_len, int fh_type) 773 { 774 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 775 ntfs_export_get_inode); 776 } 777 778 static struct dentry *ntfs_fh_to_parent(struct super_block *sb, struct fid *fid, 779 int fh_len, int fh_type) 780 { 781 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 782 ntfs_export_get_inode); 783 } 784 785 /* TODO: == ntfs_sync_inode */ 786 static int ntfs_nfs_commit_metadata(struct inode *inode) 787 { 788 return _ni_write_inode(inode, 1); 789 } 790 791 static const struct export_operations ntfs_export_ops = { 792 .fh_to_dentry = ntfs_fh_to_dentry, 793 .fh_to_parent = ntfs_fh_to_parent, 794 .get_parent = ntfs3_get_parent, 795 .commit_metadata = ntfs_nfs_commit_metadata, 796 }; 797 798 /* 799 * format_size_gb - Return Gb,Mb to print with "%u.%02u Gb". 800 */ 801 static u32 format_size_gb(const u64 bytes, u32 *mb) 802 { 803 /* Do simple right 30 bit shift of 64 bit value. */ 804 u64 kbytes = bytes >> 10; 805 u32 kbytes32 = kbytes; 806 807 *mb = (100 * (kbytes32 & 0xfffff) + 0x7ffff) >> 20; 808 if (*mb >= 100) 809 *mb = 99; 810 811 return (kbytes32 >> 20) | (((u32)(kbytes >> 32)) << 12); 812 } 813 814 static u32 true_sectors_per_clst(const struct NTFS_BOOT *boot) 815 { 816 if (boot->sectors_per_clusters <= 0x80) 817 return boot->sectors_per_clusters; 818 if (boot->sectors_per_clusters >= 0xf4) /* limit shift to 2MB max */ 819 return 1U << (-(s8)boot->sectors_per_clusters); 820 return -EINVAL; 821 } 822 823 /* 824 * ntfs_init_from_boot - Init internal info from on-disk boot sector. 825 * 826 * NTFS mount begins from boot - special formatted 512 bytes. 827 * There are two boots: the first and the last 512 bytes of volume. 828 * The content of boot is not changed during ntfs life. 829 * 830 * NOTE: ntfs.sys checks only first (primary) boot. 831 * chkdsk checks both boots. 832 */ 833 static int ntfs_init_from_boot(struct super_block *sb, u32 sector_size, 834 u64 dev_size, struct NTFS_BOOT **boot2) 835 { 836 struct ntfs_sb_info *sbi = sb->s_fs_info; 837 int err; 838 u32 mb, gb, boot_sector_size, sct_per_clst, record_size; 839 u64 sectors, clusters, mlcn, mlcn2; 840 struct NTFS_BOOT *boot; 841 struct buffer_head *bh; 842 struct MFT_REC *rec; 843 u16 fn, ao; 844 u8 cluster_bits; 845 u32 boot_off = 0; 846 const char *hint = "Primary boot"; 847 848 sbi->volume.blocks = dev_size >> PAGE_SHIFT; 849 850 bh = ntfs_bread(sb, 0); 851 if (!bh) 852 return -EIO; 853 854 check_boot: 855 err = -EINVAL; 856 boot = (struct NTFS_BOOT *)Add2Ptr(bh->b_data, boot_off); 857 858 if (memcmp(boot->system_id, "NTFS ", sizeof("NTFS ") - 1)) { 859 ntfs_err(sb, "%s signature is not NTFS.", hint); 860 goto out; 861 } 862 863 /* 0x55AA is not mandaroty. Thanks Maxim Suhanov*/ 864 /*if (0x55 != boot->boot_magic[0] || 0xAA != boot->boot_magic[1]) 865 * goto out; 866 */ 867 868 boot_sector_size = ((u32)boot->bytes_per_sector[1] << 8) | 869 boot->bytes_per_sector[0]; 870 if (boot_sector_size < SECTOR_SIZE || 871 !is_power_of_2(boot_sector_size)) { 872 ntfs_err(sb, "%s: invalid bytes per sector %u.", hint, 873 boot_sector_size); 874 goto out; 875 } 876 877 /* cluster size: 512, 1K, 2K, 4K, ... 2M */ 878 sct_per_clst = true_sectors_per_clst(boot); 879 if ((int)sct_per_clst < 0 || !is_power_of_2(sct_per_clst)) { 880 ntfs_err(sb, "%s: invalid sectors per cluster %u.", hint, 881 sct_per_clst); 882 goto out; 883 } 884 885 sbi->cluster_size = boot_sector_size * sct_per_clst; 886 sbi->cluster_bits = cluster_bits = blksize_bits(sbi->cluster_size); 887 sbi->cluster_mask = sbi->cluster_size - 1; 888 sbi->cluster_mask_inv = ~(u64)sbi->cluster_mask; 889 890 mlcn = le64_to_cpu(boot->mft_clst); 891 mlcn2 = le64_to_cpu(boot->mft2_clst); 892 sectors = le64_to_cpu(boot->sectors_per_volume); 893 894 if (mlcn * sct_per_clst >= sectors || mlcn2 * sct_per_clst >= sectors) { 895 ntfs_err( 896 sb, 897 "%s: start of MFT 0x%llx (0x%llx) is out of volume 0x%llx.", 898 hint, mlcn, mlcn2, sectors); 899 goto out; 900 } 901 902 sbi->record_size = record_size = 903 boot->record_size < 0 ? 1 << (-boot->record_size) : 904 (u32)boot->record_size << cluster_bits; 905 sbi->record_bits = blksize_bits(record_size); 906 sbi->attr_size_tr = (5 * record_size >> 4); // ~320 bytes 907 908 /* Check MFT record size. */ 909 if (record_size < SECTOR_SIZE || !is_power_of_2(record_size)) { 910 ntfs_err(sb, "%s: invalid bytes per MFT record %u (%d).", hint, 911 record_size, boot->record_size); 912 goto out; 913 } 914 915 if (record_size > MAXIMUM_BYTES_PER_MFT) { 916 ntfs_err(sb, "Unsupported bytes per MFT record %u.", 917 record_size); 918 goto out; 919 } 920 921 sbi->index_size = boot->index_size < 0 ? 922 1u << (-boot->index_size) : 923 (u32)boot->index_size << cluster_bits; 924 925 /* Check index record size. */ 926 if (sbi->index_size < SECTOR_SIZE || !is_power_of_2(sbi->index_size)) { 927 ntfs_err(sb, "%s: invalid bytes per index %u(%d).", hint, 928 sbi->index_size, boot->index_size); 929 goto out; 930 } 931 932 if (sbi->index_size > MAXIMUM_BYTES_PER_INDEX) { 933 ntfs_err(sb, "%s: unsupported bytes per index %u.", hint, 934 sbi->index_size); 935 goto out; 936 } 937 938 sbi->volume.size = sectors * boot_sector_size; 939 940 gb = format_size_gb(sbi->volume.size + boot_sector_size, &mb); 941 942 /* 943 * - Volume formatted and mounted with the same sector size. 944 * - Volume formatted 4K and mounted as 512. 945 * - Volume formatted 512 and mounted as 4K. 946 */ 947 if (boot_sector_size != sector_size) { 948 ntfs_warn( 949 sb, 950 "Different NTFS sector size (%u) and media sector size (%u).", 951 boot_sector_size, sector_size); 952 dev_size += sector_size - 1; 953 } 954 955 sbi->mft.lbo = mlcn << cluster_bits; 956 sbi->mft.lbo2 = mlcn2 << cluster_bits; 957 958 /* Compare boot's cluster and sector. */ 959 if (sbi->cluster_size < boot_sector_size) { 960 ntfs_err(sb, "%s: invalid bytes per cluster (%u).", hint, 961 sbi->cluster_size); 962 goto out; 963 } 964 965 /* Compare boot's cluster and media sector. */ 966 if (sbi->cluster_size < sector_size) { 967 /* No way to use ntfs_get_block in this case. */ 968 ntfs_err( 969 sb, 970 "Failed to mount 'cause NTFS's cluster size (%u) is less than media sector size (%u).", 971 sbi->cluster_size, sector_size); 972 goto out; 973 } 974 975 sbi->max_bytes_per_attr = 976 record_size - ALIGN(MFTRECORD_FIXUP_OFFSET, 8) - 977 ALIGN(((record_size >> SECTOR_SHIFT) * sizeof(short)), 8) - 978 ALIGN(sizeof(enum ATTR_TYPE), 8); 979 980 sbi->volume.ser_num = le64_to_cpu(boot->serial_num); 981 982 /* Warning if RAW volume. */ 983 if (dev_size < sbi->volume.size + boot_sector_size) { 984 u32 mb0, gb0; 985 986 gb0 = format_size_gb(dev_size, &mb0); 987 ntfs_warn( 988 sb, 989 "RAW NTFS volume: Filesystem size %u.%02u Gb > volume size %u.%02u Gb. Mount in read-only.", 990 gb, mb, gb0, mb0); 991 sb->s_flags |= SB_RDONLY; 992 } 993 994 clusters = sbi->volume.size >> cluster_bits; 995 #ifndef CONFIG_NTFS3_64BIT_CLUSTER 996 /* 32 bits per cluster. */ 997 if (clusters >> 32) { 998 ntfs_notice( 999 sb, 1000 "NTFS %u.%02u Gb is too big to use 32 bits per cluster.", 1001 gb, mb); 1002 goto out; 1003 } 1004 #elif BITS_PER_LONG < 64 1005 #error "CONFIG_NTFS3_64BIT_CLUSTER incompatible in 32 bit OS" 1006 #endif 1007 1008 sbi->used.bitmap.nbits = clusters; 1009 1010 rec = kzalloc(record_size, GFP_NOFS); 1011 if (!rec) { 1012 err = -ENOMEM; 1013 goto out; 1014 } 1015 1016 sbi->new_rec = rec; 1017 rec->rhdr.sign = NTFS_FILE_SIGNATURE; 1018 rec->rhdr.fix_off = cpu_to_le16(MFTRECORD_FIXUP_OFFSET); 1019 fn = (sbi->record_size >> SECTOR_SHIFT) + 1; 1020 rec->rhdr.fix_num = cpu_to_le16(fn); 1021 ao = ALIGN(MFTRECORD_FIXUP_OFFSET + sizeof(short) * fn, 8); 1022 rec->attr_off = cpu_to_le16(ao); 1023 rec->used = cpu_to_le32(ao + ALIGN(sizeof(enum ATTR_TYPE), 8)); 1024 rec->total = cpu_to_le32(sbi->record_size); 1025 ((struct ATTRIB *)Add2Ptr(rec, ao))->type = ATTR_END; 1026 1027 sb_set_blocksize(sb, min_t(u32, sbi->cluster_size, PAGE_SIZE)); 1028 1029 sbi->block_mask = sb->s_blocksize - 1; 1030 sbi->blocks_per_cluster = sbi->cluster_size >> sb->s_blocksize_bits; 1031 sbi->volume.blocks = sbi->volume.size >> sb->s_blocksize_bits; 1032 1033 /* Maximum size for normal files. */ 1034 sbi->maxbytes = (clusters << cluster_bits) - 1; 1035 1036 #ifdef CONFIG_NTFS3_64BIT_CLUSTER 1037 if (clusters >= (1ull << (64 - cluster_bits))) 1038 sbi->maxbytes = -1; 1039 sbi->maxbytes_sparse = -1; 1040 sb->s_maxbytes = MAX_LFS_FILESIZE; 1041 #else 1042 /* Maximum size for sparse file. */ 1043 sbi->maxbytes_sparse = (1ull << (cluster_bits + 32)) - 1; 1044 sb->s_maxbytes = 0xFFFFFFFFull << cluster_bits; 1045 #endif 1046 1047 /* 1048 * Compute the MFT zone at two steps. 1049 * It would be nice if we are able to allocate 1/8 of 1050 * total clusters for MFT but not more then 512 MB. 1051 */ 1052 sbi->zone_max = min_t(CLST, 0x20000000 >> cluster_bits, clusters >> 3); 1053 1054 err = 0; 1055 1056 if (bh->b_blocknr && !sb_rdonly(sb)) { 1057 /* 1058 * Alternative boot is ok but primary is not ok. 1059 * Do not update primary boot here 'cause it may be faked boot. 1060 * Let ntfs to be mounted and update boot later. 1061 */ 1062 *boot2 = kmemdup(boot, sizeof(*boot), GFP_NOFS | __GFP_NOWARN); 1063 } 1064 1065 out: 1066 if (err == -EINVAL && !bh->b_blocknr && dev_size > PAGE_SHIFT) { 1067 u32 block_size = min_t(u32, sector_size, PAGE_SIZE); 1068 u64 lbo = dev_size - sizeof(*boot); 1069 1070 /* 1071 * Try alternative boot (last sector) 1072 */ 1073 brelse(bh); 1074 1075 sb_set_blocksize(sb, block_size); 1076 bh = ntfs_bread(sb, lbo >> blksize_bits(block_size)); 1077 if (!bh) 1078 return -EINVAL; 1079 1080 boot_off = lbo & (block_size - 1); 1081 hint = "Alternative boot"; 1082 goto check_boot; 1083 } 1084 brelse(bh); 1085 1086 return err; 1087 } 1088 1089 /* 1090 * ntfs_fill_super - Try to mount. 1091 */ 1092 static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc) 1093 { 1094 int err; 1095 struct ntfs_sb_info *sbi = sb->s_fs_info; 1096 struct block_device *bdev = sb->s_bdev; 1097 struct ntfs_mount_options *options; 1098 struct inode *inode; 1099 struct ntfs_inode *ni; 1100 size_t i, tt, bad_len, bad_frags; 1101 CLST vcn, lcn, len; 1102 struct ATTRIB *attr; 1103 const struct VOLUME_INFO *info; 1104 u32 idx, done, bytes; 1105 struct ATTR_DEF_ENTRY *t; 1106 u16 *shared; 1107 struct MFT_REF ref; 1108 bool ro = sb_rdonly(sb); 1109 struct NTFS_BOOT *boot2 = NULL; 1110 1111 ref.high = 0; 1112 1113 sbi->sb = sb; 1114 sbi->options = options = fc->fs_private; 1115 fc->fs_private = NULL; 1116 sb->s_flags |= SB_NODIRATIME; 1117 sb->s_magic = 0x7366746e; // "ntfs" 1118 sb->s_op = &ntfs_sops; 1119 sb->s_export_op = &ntfs_export_ops; 1120 sb->s_time_gran = NTFS_TIME_GRAN; // 100 nsec 1121 sb->s_xattr = ntfs_xattr_handlers; 1122 sb->s_d_op = options->nocase ? &ntfs_dentry_ops : NULL; 1123 1124 options->nls = ntfs_load_nls(options->nls_name); 1125 if (IS_ERR(options->nls)) { 1126 options->nls = NULL; 1127 errorf(fc, "Cannot load nls %s", options->nls_name); 1128 err = -EINVAL; 1129 goto out; 1130 } 1131 1132 if (bdev_max_discard_sectors(bdev) && bdev_discard_granularity(bdev)) { 1133 sbi->discard_granularity = bdev_discard_granularity(bdev); 1134 sbi->discard_granularity_mask_inv = 1135 ~(u64)(sbi->discard_granularity - 1); 1136 } 1137 1138 /* Parse boot. */ 1139 err = ntfs_init_from_boot(sb, bdev_logical_block_size(bdev), 1140 bdev_nr_bytes(bdev), &boot2); 1141 if (err) 1142 goto out; 1143 1144 /* 1145 * Load $Volume. This should be done before $LogFile 1146 * 'cause 'sbi->volume.ni' is used 'ntfs_set_state'. 1147 */ 1148 ref.low = cpu_to_le32(MFT_REC_VOL); 1149 ref.seq = cpu_to_le16(MFT_REC_VOL); 1150 inode = ntfs_iget5(sb, &ref, &NAME_VOLUME); 1151 if (IS_ERR(inode)) { 1152 err = PTR_ERR(inode); 1153 ntfs_err(sb, "Failed to load $Volume (%d).", err); 1154 goto out; 1155 } 1156 1157 ni = ntfs_i(inode); 1158 1159 /* Load and save label (not necessary). */ 1160 attr = ni_find_attr(ni, NULL, NULL, ATTR_LABEL, NULL, 0, NULL, NULL); 1161 1162 if (!attr) { 1163 /* It is ok if no ATTR_LABEL */ 1164 } else if (!attr->non_res && !is_attr_ext(attr)) { 1165 /* $AttrDef allows labels to be up to 128 symbols. */ 1166 err = utf16s_to_utf8s(resident_data(attr), 1167 le32_to_cpu(attr->res.data_size) >> 1, 1168 UTF16_LITTLE_ENDIAN, sbi->volume.label, 1169 sizeof(sbi->volume.label)); 1170 if (err < 0) 1171 sbi->volume.label[0] = 0; 1172 } else { 1173 /* Should we break mounting here? */ 1174 //err = -EINVAL; 1175 //goto put_inode_out; 1176 } 1177 1178 attr = ni_find_attr(ni, attr, NULL, ATTR_VOL_INFO, NULL, 0, NULL, NULL); 1179 if (!attr || is_attr_ext(attr) || 1180 !(info = resident_data_ex(attr, SIZEOF_ATTRIBUTE_VOLUME_INFO))) { 1181 ntfs_err(sb, "$Volume is corrupted."); 1182 err = -EINVAL; 1183 goto put_inode_out; 1184 } 1185 1186 sbi->volume.major_ver = info->major_ver; 1187 sbi->volume.minor_ver = info->minor_ver; 1188 sbi->volume.flags = info->flags; 1189 sbi->volume.ni = ni; 1190 if (info->flags & VOLUME_FLAG_DIRTY) { 1191 sbi->volume.real_dirty = true; 1192 ntfs_info(sb, "It is recommened to use chkdsk."); 1193 } 1194 1195 /* Load $MFTMirr to estimate recs_mirr. */ 1196 ref.low = cpu_to_le32(MFT_REC_MIRR); 1197 ref.seq = cpu_to_le16(MFT_REC_MIRR); 1198 inode = ntfs_iget5(sb, &ref, &NAME_MIRROR); 1199 if (IS_ERR(inode)) { 1200 err = PTR_ERR(inode); 1201 ntfs_err(sb, "Failed to load $MFTMirr (%d).", err); 1202 goto out; 1203 } 1204 1205 sbi->mft.recs_mirr = ntfs_up_cluster(sbi, inode->i_size) >> 1206 sbi->record_bits; 1207 1208 iput(inode); 1209 1210 /* Load LogFile to replay. */ 1211 ref.low = cpu_to_le32(MFT_REC_LOG); 1212 ref.seq = cpu_to_le16(MFT_REC_LOG); 1213 inode = ntfs_iget5(sb, &ref, &NAME_LOGFILE); 1214 if (IS_ERR(inode)) { 1215 err = PTR_ERR(inode); 1216 ntfs_err(sb, "Failed to load \x24LogFile (%d).", err); 1217 goto out; 1218 } 1219 1220 ni = ntfs_i(inode); 1221 1222 err = ntfs_loadlog_and_replay(ni, sbi); 1223 if (err) 1224 goto put_inode_out; 1225 1226 iput(inode); 1227 1228 if ((sbi->flags & NTFS_FLAGS_NEED_REPLAY) && !ro) { 1229 ntfs_warn(sb, "failed to replay log file. Can't mount rw!"); 1230 err = -EINVAL; 1231 goto out; 1232 } 1233 1234 if ((sbi->volume.flags & VOLUME_FLAG_DIRTY) && !ro && !options->force) { 1235 ntfs_warn(sb, "volume is dirty and \"force\" flag is not set!"); 1236 err = -EINVAL; 1237 goto out; 1238 } 1239 1240 /* Load $MFT. */ 1241 ref.low = cpu_to_le32(MFT_REC_MFT); 1242 ref.seq = cpu_to_le16(1); 1243 1244 inode = ntfs_iget5(sb, &ref, &NAME_MFT); 1245 if (IS_ERR(inode)) { 1246 err = PTR_ERR(inode); 1247 ntfs_err(sb, "Failed to load $MFT (%d).", err); 1248 goto out; 1249 } 1250 1251 ni = ntfs_i(inode); 1252 1253 sbi->mft.used = ni->i_valid >> sbi->record_bits; 1254 tt = inode->i_size >> sbi->record_bits; 1255 sbi->mft.next_free = MFT_REC_USER; 1256 1257 err = wnd_init(&sbi->mft.bitmap, sb, tt); 1258 if (err) 1259 goto put_inode_out; 1260 1261 err = ni_load_all_mi(ni); 1262 if (err) { 1263 ntfs_err(sb, "Failed to load $MFT's subrecords (%d).", err); 1264 goto put_inode_out; 1265 } 1266 1267 sbi->mft.ni = ni; 1268 1269 /* Load $Bitmap. */ 1270 ref.low = cpu_to_le32(MFT_REC_BITMAP); 1271 ref.seq = cpu_to_le16(MFT_REC_BITMAP); 1272 inode = ntfs_iget5(sb, &ref, &NAME_BITMAP); 1273 if (IS_ERR(inode)) { 1274 err = PTR_ERR(inode); 1275 ntfs_err(sb, "Failed to load $Bitmap (%d).", err); 1276 goto out; 1277 } 1278 1279 #ifndef CONFIG_NTFS3_64BIT_CLUSTER 1280 if (inode->i_size >> 32) { 1281 err = -EINVAL; 1282 goto put_inode_out; 1283 } 1284 #endif 1285 1286 /* Check bitmap boundary. */ 1287 tt = sbi->used.bitmap.nbits; 1288 if (inode->i_size < bitmap_size(tt)) { 1289 ntfs_err(sb, "$Bitmap is corrupted."); 1290 err = -EINVAL; 1291 goto put_inode_out; 1292 } 1293 1294 err = wnd_init(&sbi->used.bitmap, sb, tt); 1295 if (err) { 1296 ntfs_err(sb, "Failed to initialize $Bitmap (%d).", err); 1297 goto put_inode_out; 1298 } 1299 1300 iput(inode); 1301 1302 /* Compute the MFT zone. */ 1303 err = ntfs_refresh_zone(sbi); 1304 if (err) { 1305 ntfs_err(sb, "Failed to initialize MFT zone (%d).", err); 1306 goto out; 1307 } 1308 1309 /* Load $BadClus. */ 1310 ref.low = cpu_to_le32(MFT_REC_BADCLUST); 1311 ref.seq = cpu_to_le16(MFT_REC_BADCLUST); 1312 inode = ntfs_iget5(sb, &ref, &NAME_BADCLUS); 1313 if (IS_ERR(inode)) { 1314 err = PTR_ERR(inode); 1315 ntfs_err(sb, "Failed to load $BadClus (%d).", err); 1316 goto out; 1317 } 1318 1319 ni = ntfs_i(inode); 1320 bad_len = bad_frags = 0; 1321 for (i = 0; run_get_entry(&ni->file.run, i, &vcn, &lcn, &len); i++) { 1322 if (lcn == SPARSE_LCN) 1323 continue; 1324 1325 bad_len += len; 1326 bad_frags += 1; 1327 if (ro) 1328 continue; 1329 1330 if (wnd_set_used_safe(&sbi->used.bitmap, lcn, len, &tt) || tt) { 1331 /* Bad blocks marked as free in bitmap. */ 1332 ntfs_set_state(sbi, NTFS_DIRTY_ERROR); 1333 } 1334 } 1335 if (bad_len) { 1336 /* 1337 * Notice about bad blocks. 1338 * In normal cases these blocks are marked as used in bitmap. 1339 * And we never allocate space in it. 1340 */ 1341 ntfs_notice(sb, 1342 "Volume contains %zu bad blocks in %zu fragments.", 1343 bad_len, bad_frags); 1344 } 1345 iput(inode); 1346 1347 /* Load $AttrDef. */ 1348 ref.low = cpu_to_le32(MFT_REC_ATTR); 1349 ref.seq = cpu_to_le16(MFT_REC_ATTR); 1350 inode = ntfs_iget5(sb, &ref, &NAME_ATTRDEF); 1351 if (IS_ERR(inode)) { 1352 err = PTR_ERR(inode); 1353 ntfs_err(sb, "Failed to load $AttrDef (%d)", err); 1354 goto out; 1355 } 1356 1357 /* 1358 * Typical $AttrDef contains up to 20 entries. 1359 * Check for extremely large/small size. 1360 */ 1361 if (inode->i_size < sizeof(struct ATTR_DEF_ENTRY) || 1362 inode->i_size > 100 * sizeof(struct ATTR_DEF_ENTRY)) { 1363 ntfs_err(sb, "Looks like $AttrDef is corrupted (size=%llu).", 1364 inode->i_size); 1365 err = -EINVAL; 1366 goto put_inode_out; 1367 } 1368 1369 bytes = inode->i_size; 1370 sbi->def_table = t = kmalloc(bytes, GFP_NOFS | __GFP_NOWARN); 1371 if (!t) { 1372 err = -ENOMEM; 1373 goto put_inode_out; 1374 } 1375 1376 for (done = idx = 0; done < bytes; done += PAGE_SIZE, idx++) { 1377 unsigned long tail = bytes - done; 1378 struct page *page = ntfs_map_page(inode->i_mapping, idx); 1379 1380 if (IS_ERR(page)) { 1381 err = PTR_ERR(page); 1382 ntfs_err(sb, "Failed to read $AttrDef (%d).", err); 1383 goto put_inode_out; 1384 } 1385 memcpy(Add2Ptr(t, done), page_address(page), 1386 min(PAGE_SIZE, tail)); 1387 ntfs_unmap_page(page); 1388 1389 if (!idx && ATTR_STD != t->type) { 1390 ntfs_err(sb, "$AttrDef is corrupted."); 1391 err = -EINVAL; 1392 goto put_inode_out; 1393 } 1394 } 1395 1396 t += 1; 1397 sbi->def_entries = 1; 1398 done = sizeof(struct ATTR_DEF_ENTRY); 1399 sbi->reparse.max_size = MAXIMUM_REPARSE_DATA_BUFFER_SIZE; 1400 sbi->ea_max_size = 0x10000; /* default formatter value */ 1401 1402 while (done + sizeof(struct ATTR_DEF_ENTRY) <= bytes) { 1403 u32 t32 = le32_to_cpu(t->type); 1404 u64 sz = le64_to_cpu(t->max_sz); 1405 1406 if ((t32 & 0xF) || le32_to_cpu(t[-1].type) >= t32) 1407 break; 1408 1409 if (t->type == ATTR_REPARSE) 1410 sbi->reparse.max_size = sz; 1411 else if (t->type == ATTR_EA) 1412 sbi->ea_max_size = sz; 1413 1414 done += sizeof(struct ATTR_DEF_ENTRY); 1415 t += 1; 1416 sbi->def_entries += 1; 1417 } 1418 iput(inode); 1419 1420 /* Load $UpCase. */ 1421 ref.low = cpu_to_le32(MFT_REC_UPCASE); 1422 ref.seq = cpu_to_le16(MFT_REC_UPCASE); 1423 inode = ntfs_iget5(sb, &ref, &NAME_UPCASE); 1424 if (IS_ERR(inode)) { 1425 err = PTR_ERR(inode); 1426 ntfs_err(sb, "Failed to load $UpCase (%d).", err); 1427 goto out; 1428 } 1429 1430 if (inode->i_size != 0x10000 * sizeof(short)) { 1431 err = -EINVAL; 1432 ntfs_err(sb, "$UpCase is corrupted."); 1433 goto put_inode_out; 1434 } 1435 1436 for (idx = 0; idx < (0x10000 * sizeof(short) >> PAGE_SHIFT); idx++) { 1437 const __le16 *src; 1438 u16 *dst = Add2Ptr(sbi->upcase, idx << PAGE_SHIFT); 1439 struct page *page = ntfs_map_page(inode->i_mapping, idx); 1440 1441 if (IS_ERR(page)) { 1442 err = PTR_ERR(page); 1443 ntfs_err(sb, "Failed to read $UpCase (%d).", err); 1444 goto put_inode_out; 1445 } 1446 1447 src = page_address(page); 1448 1449 #ifdef __BIG_ENDIAN 1450 for (i = 0; i < PAGE_SIZE / sizeof(u16); i++) 1451 *dst++ = le16_to_cpu(*src++); 1452 #else 1453 memcpy(dst, src, PAGE_SIZE); 1454 #endif 1455 ntfs_unmap_page(page); 1456 } 1457 1458 shared = ntfs_set_shared(sbi->upcase, 0x10000 * sizeof(short)); 1459 if (shared && sbi->upcase != shared) { 1460 kvfree(sbi->upcase); 1461 sbi->upcase = shared; 1462 } 1463 1464 iput(inode); 1465 1466 if (is_ntfs3(sbi)) { 1467 /* Load $Secure. */ 1468 err = ntfs_security_init(sbi); 1469 if (err) { 1470 ntfs_err(sb, "Failed to initialize $Secure (%d).", err); 1471 goto out; 1472 } 1473 1474 /* Load $Extend. */ 1475 err = ntfs_extend_init(sbi); 1476 if (err) { 1477 ntfs_warn(sb, "Failed to initialize $Extend."); 1478 goto load_root; 1479 } 1480 1481 /* Load $Extend/$Reparse. */ 1482 err = ntfs_reparse_init(sbi); 1483 if (err) { 1484 ntfs_warn(sb, "Failed to initialize $Extend/$Reparse."); 1485 goto load_root; 1486 } 1487 1488 /* Load $Extend/$ObjId. */ 1489 err = ntfs_objid_init(sbi); 1490 if (err) { 1491 ntfs_warn(sb, "Failed to initialize $Extend/$ObjId."); 1492 goto load_root; 1493 } 1494 } 1495 1496 load_root: 1497 /* Load root. */ 1498 ref.low = cpu_to_le32(MFT_REC_ROOT); 1499 ref.seq = cpu_to_le16(MFT_REC_ROOT); 1500 inode = ntfs_iget5(sb, &ref, &NAME_ROOT); 1501 if (IS_ERR(inode)) { 1502 err = PTR_ERR(inode); 1503 ntfs_err(sb, "Failed to load root (%d).", err); 1504 goto out; 1505 } 1506 1507 /* 1508 * Final check. Looks like this case should never occurs. 1509 */ 1510 if (!inode->i_op) { 1511 err = -EINVAL; 1512 ntfs_err(sb, "Failed to load root (%d).", err); 1513 goto put_inode_out; 1514 } 1515 1516 sb->s_root = d_make_root(inode); 1517 if (!sb->s_root) { 1518 err = -ENOMEM; 1519 goto put_inode_out; 1520 } 1521 1522 if (boot2) { 1523 /* 1524 * Alternative boot is ok but primary is not ok. 1525 * Volume is recognized as NTFS. Update primary boot. 1526 */ 1527 struct buffer_head *bh0 = sb_getblk(sb, 0); 1528 if (bh0) { 1529 if (buffer_locked(bh0)) 1530 __wait_on_buffer(bh0); 1531 1532 lock_buffer(bh0); 1533 memcpy(bh0->b_data, boot2, sizeof(*boot2)); 1534 set_buffer_uptodate(bh0); 1535 mark_buffer_dirty(bh0); 1536 unlock_buffer(bh0); 1537 if (!sync_dirty_buffer(bh0)) 1538 ntfs_warn(sb, "primary boot is updated"); 1539 put_bh(bh0); 1540 } 1541 1542 kfree(boot2); 1543 } 1544 1545 #ifdef CONFIG_PROC_FS 1546 /* Create /proc/fs/ntfs3/.. */ 1547 if (proc_info_root) { 1548 struct proc_dir_entry *e = proc_mkdir(sb->s_id, proc_info_root); 1549 static_assert((S_IRUGO | S_IWUSR) == 0644); 1550 if (e) { 1551 proc_create_data("volinfo", S_IRUGO, e, 1552 &ntfs3_volinfo_fops, sb); 1553 proc_create_data("label", S_IRUGO | S_IWUSR, e, 1554 &ntfs3_label_fops, sb); 1555 sbi->procdir = e; 1556 } 1557 } 1558 #endif 1559 1560 return 0; 1561 1562 put_inode_out: 1563 iput(inode); 1564 out: 1565 kfree(boot2); 1566 return err; 1567 } 1568 1569 void ntfs_unmap_meta(struct super_block *sb, CLST lcn, CLST len) 1570 { 1571 struct ntfs_sb_info *sbi = sb->s_fs_info; 1572 struct block_device *bdev = sb->s_bdev; 1573 sector_t devblock = (u64)lcn * sbi->blocks_per_cluster; 1574 unsigned long blocks = (u64)len * sbi->blocks_per_cluster; 1575 unsigned long cnt = 0; 1576 unsigned long limit = global_zone_page_state(NR_FREE_PAGES) 1577 << (PAGE_SHIFT - sb->s_blocksize_bits); 1578 1579 if (limit >= 0x2000) 1580 limit -= 0x1000; 1581 else if (limit < 32) 1582 limit = 32; 1583 else 1584 limit >>= 1; 1585 1586 while (blocks--) { 1587 clean_bdev_aliases(bdev, devblock++, 1); 1588 if (cnt++ >= limit) { 1589 sync_blockdev(bdev); 1590 cnt = 0; 1591 } 1592 } 1593 } 1594 1595 /* 1596 * ntfs_discard - Issue a discard request (trim for SSD). 1597 */ 1598 int ntfs_discard(struct ntfs_sb_info *sbi, CLST lcn, CLST len) 1599 { 1600 int err; 1601 u64 lbo, bytes, start, end; 1602 struct super_block *sb; 1603 1604 if (sbi->used.next_free_lcn == lcn + len) 1605 sbi->used.next_free_lcn = lcn; 1606 1607 if (sbi->flags & NTFS_FLAGS_NODISCARD) 1608 return -EOPNOTSUPP; 1609 1610 if (!sbi->options->discard) 1611 return -EOPNOTSUPP; 1612 1613 lbo = (u64)lcn << sbi->cluster_bits; 1614 bytes = (u64)len << sbi->cluster_bits; 1615 1616 /* Align up 'start' on discard_granularity. */ 1617 start = (lbo + sbi->discard_granularity - 1) & 1618 sbi->discard_granularity_mask_inv; 1619 /* Align down 'end' on discard_granularity. */ 1620 end = (lbo + bytes) & sbi->discard_granularity_mask_inv; 1621 1622 sb = sbi->sb; 1623 if (start >= end) 1624 return 0; 1625 1626 err = blkdev_issue_discard(sb->s_bdev, start >> 9, (end - start) >> 9, 1627 GFP_NOFS); 1628 1629 if (err == -EOPNOTSUPP) 1630 sbi->flags |= NTFS_FLAGS_NODISCARD; 1631 1632 return err; 1633 } 1634 1635 static int ntfs_fs_get_tree(struct fs_context *fc) 1636 { 1637 return get_tree_bdev(fc, ntfs_fill_super); 1638 } 1639 1640 /* 1641 * ntfs_fs_free - Free fs_context. 1642 * 1643 * Note that this will be called after fill_super and reconfigure 1644 * even when they pass. So they have to take pointers if they pass. 1645 */ 1646 static void ntfs_fs_free(struct fs_context *fc) 1647 { 1648 struct ntfs_mount_options *opts = fc->fs_private; 1649 struct ntfs_sb_info *sbi = fc->s_fs_info; 1650 1651 if (sbi) { 1652 ntfs3_put_sbi(sbi); 1653 ntfs3_free_sbi(sbi); 1654 } 1655 1656 if (opts) 1657 put_mount_options(opts); 1658 } 1659 1660 // clang-format off 1661 static const struct fs_context_operations ntfs_context_ops = { 1662 .parse_param = ntfs_fs_parse_param, 1663 .get_tree = ntfs_fs_get_tree, 1664 .reconfigure = ntfs_fs_reconfigure, 1665 .free = ntfs_fs_free, 1666 }; 1667 // clang-format on 1668 1669 /* 1670 * ntfs_init_fs_context - Initialize sbi and opts 1671 * 1672 * This will called when mount/remount. We will first initialize 1673 * options so that if remount we can use just that. 1674 */ 1675 static int ntfs_init_fs_context(struct fs_context *fc) 1676 { 1677 struct ntfs_mount_options *opts; 1678 struct ntfs_sb_info *sbi; 1679 1680 opts = kzalloc(sizeof(struct ntfs_mount_options), GFP_NOFS); 1681 if (!opts) 1682 return -ENOMEM; 1683 1684 /* Default options. */ 1685 opts->fs_uid = current_uid(); 1686 opts->fs_gid = current_gid(); 1687 opts->fs_fmask_inv = ~current_umask(); 1688 opts->fs_dmask_inv = ~current_umask(); 1689 1690 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) 1691 goto ok; 1692 1693 sbi = kzalloc(sizeof(struct ntfs_sb_info), GFP_NOFS); 1694 if (!sbi) 1695 goto free_opts; 1696 1697 sbi->upcase = kvmalloc(0x10000 * sizeof(short), GFP_KERNEL); 1698 if (!sbi->upcase) 1699 goto free_sbi; 1700 1701 ratelimit_state_init(&sbi->msg_ratelimit, DEFAULT_RATELIMIT_INTERVAL, 1702 DEFAULT_RATELIMIT_BURST); 1703 1704 mutex_init(&sbi->compress.mtx_lznt); 1705 #ifdef CONFIG_NTFS3_LZX_XPRESS 1706 mutex_init(&sbi->compress.mtx_xpress); 1707 mutex_init(&sbi->compress.mtx_lzx); 1708 #endif 1709 1710 fc->s_fs_info = sbi; 1711 ok: 1712 fc->fs_private = opts; 1713 fc->ops = &ntfs_context_ops; 1714 1715 return 0; 1716 free_sbi: 1717 kfree(sbi); 1718 free_opts: 1719 kfree(opts); 1720 return -ENOMEM; 1721 } 1722 1723 static void ntfs3_kill_sb(struct super_block *sb) 1724 { 1725 struct ntfs_sb_info *sbi = sb->s_fs_info; 1726 1727 kill_block_super(sb); 1728 1729 if (sbi->options) 1730 put_mount_options(sbi->options); 1731 ntfs3_free_sbi(sbi); 1732 } 1733 1734 // clang-format off 1735 static struct file_system_type ntfs_fs_type = { 1736 .owner = THIS_MODULE, 1737 .name = "ntfs3", 1738 .init_fs_context = ntfs_init_fs_context, 1739 .parameters = ntfs_fs_parameters, 1740 .kill_sb = ntfs3_kill_sb, 1741 .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP, 1742 }; 1743 // clang-format on 1744 1745 static int __init init_ntfs_fs(void) 1746 { 1747 int err; 1748 1749 pr_info("ntfs3: Max link count %u\n", NTFS_LINK_MAX); 1750 1751 if (IS_ENABLED(CONFIG_NTFS3_FS_POSIX_ACL)) 1752 pr_info("ntfs3: Enabled Linux POSIX ACLs support\n"); 1753 if (IS_ENABLED(CONFIG_NTFS3_64BIT_CLUSTER)) 1754 pr_notice( 1755 "ntfs3: Warning: Activated 64 bits per cluster. Windows does not support this\n"); 1756 if (IS_ENABLED(CONFIG_NTFS3_LZX_XPRESS)) 1757 pr_info("ntfs3: Read-only LZX/Xpress compression included\n"); 1758 1759 1760 #ifdef CONFIG_PROC_FS 1761 /* Create "/proc/fs/ntfs3" */ 1762 proc_info_root = proc_mkdir("fs/ntfs3", NULL); 1763 #endif 1764 1765 err = ntfs3_init_bitmap(); 1766 if (err) 1767 return err; 1768 1769 ntfs_inode_cachep = kmem_cache_create( 1770 "ntfs_inode_cache", sizeof(struct ntfs_inode), 0, 1771 (SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD | SLAB_ACCOUNT), 1772 init_once); 1773 if (!ntfs_inode_cachep) { 1774 err = -ENOMEM; 1775 goto out1; 1776 } 1777 1778 err = register_filesystem(&ntfs_fs_type); 1779 if (err) 1780 goto out; 1781 1782 return 0; 1783 out: 1784 kmem_cache_destroy(ntfs_inode_cachep); 1785 out1: 1786 ntfs3_exit_bitmap(); 1787 return err; 1788 } 1789 1790 static void __exit exit_ntfs_fs(void) 1791 { 1792 rcu_barrier(); 1793 kmem_cache_destroy(ntfs_inode_cachep); 1794 unregister_filesystem(&ntfs_fs_type); 1795 ntfs3_exit_bitmap(); 1796 1797 #ifdef CONFIG_PROC_FS 1798 if (proc_info_root) 1799 remove_proc_entry("fs/ntfs3", NULL); 1800 #endif 1801 1802 } 1803 1804 MODULE_LICENSE("GPL"); 1805 MODULE_DESCRIPTION("ntfs3 read/write filesystem"); 1806 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 1807 MODULE_INFO(behaviour, "Enabled Linux POSIX ACLs support"); 1808 #endif 1809 #ifdef CONFIG_NTFS3_64BIT_CLUSTER 1810 MODULE_INFO( 1811 cluster, 1812 "Warning: Activated 64 bits per cluster. Windows does not support this"); 1813 #endif 1814 #ifdef CONFIG_NTFS3_LZX_XPRESS 1815 MODULE_INFO(compression, "Read-only lzx/xpress compression included"); 1816 #endif 1817 1818 MODULE_AUTHOR("Konstantin Komarov"); 1819 MODULE_ALIAS_FS("ntfs3"); 1820 1821 module_init(init_ntfs_fs); 1822 module_exit(exit_ntfs_fs); 1823