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 */ 77void 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 98static char s_name_buf[512]; 99static 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 */ 106void 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 */ 165static DEFINE_SPINLOCK(s_shared_lock); 166 167static 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 */ 180void *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 */ 215void *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 233static 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 240enum 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 262static 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 */ 290static 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 310static 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 405static 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 446static 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 * total number of mft records 457 * number of used mft records ~= number of files + folders 458 * real state of ntfs "dirty"/"clean" 459 * current state of ntfs "dirty"/"clean" 460*/ 461static int ntfs3_volinfo(struct seq_file *m, void *o) 462{ 463 struct super_block *sb = m->private; 464 struct ntfs_sb_info *sbi = sb->s_fs_info; 465 466 seq_printf(m, "ntfs%d.%d\n%u\n%zu\n\%zu\n%zu\n%s\n%s\n", 467 sbi->volume.major_ver, sbi->volume.minor_ver, 468 sbi->cluster_size, sbi->used.bitmap.nbits, 469 sbi->mft.bitmap.nbits, 470 sbi->mft.bitmap.nbits - wnd_zeroes(&sbi->mft.bitmap), 471 sbi->volume.real_dirty ? "dirty" : "clean", 472 (sbi->volume.flags & VOLUME_FLAG_DIRTY) ? "dirty" : "clean"); 473 474 return 0; 475} 476 477static int ntfs3_volinfo_open(struct inode *inode, struct file *file) 478{ 479 return single_open(file, ntfs3_volinfo, pde_data(inode)); 480} 481 482/* read /proc/fs/ntfs3/<dev>/label */ 483static int ntfs3_label_show(struct seq_file *m, void *o) 484{ 485 struct super_block *sb = m->private; 486 struct ntfs_sb_info *sbi = sb->s_fs_info; 487 488 seq_printf(m, "%s\n", sbi->volume.label); 489 490 return 0; 491} 492 493/* write /proc/fs/ntfs3/<dev>/label */ 494static ssize_t ntfs3_label_write(struct file *file, const char __user *buffer, 495 size_t count, loff_t *ppos) 496{ 497 int err; 498 struct super_block *sb = pde_data(file_inode(file)); 499 ssize_t ret = count; 500 u8 *label; 501 502 if (sb_rdonly(sb)) 503 return -EROFS; 504 505 label = kmalloc(count, GFP_NOFS); 506 507 if (!label) 508 return -ENOMEM; 509 510 if (copy_from_user(label, buffer, ret)) { 511 ret = -EFAULT; 512 goto out; 513 } 514 while (ret > 0 && label[ret - 1] == '\n') 515 ret -= 1; 516 517 err = ntfs_set_label(sb->s_fs_info, label, ret); 518 519 if (err < 0) { 520 ntfs_err(sb, "failed (%d) to write label", err); 521 ret = err; 522 goto out; 523 } 524 525 *ppos += count; 526 ret = count; 527out: 528 kfree(label); 529 return ret; 530} 531 532static int ntfs3_label_open(struct inode *inode, struct file *file) 533{ 534 return single_open(file, ntfs3_label_show, pde_data(inode)); 535} 536 537static const struct proc_ops ntfs3_volinfo_fops = { 538 .proc_read = seq_read, 539 .proc_lseek = seq_lseek, 540 .proc_release = single_release, 541 .proc_open = ntfs3_volinfo_open, 542}; 543 544static const struct proc_ops ntfs3_label_fops = { 545 .proc_read = seq_read, 546 .proc_lseek = seq_lseek, 547 .proc_release = single_release, 548 .proc_open = ntfs3_label_open, 549 .proc_write = ntfs3_label_write, 550}; 551 552#endif 553 554static struct kmem_cache *ntfs_inode_cachep; 555 556static struct inode *ntfs_alloc_inode(struct super_block *sb) 557{ 558 struct ntfs_inode *ni = alloc_inode_sb(sb, ntfs_inode_cachep, GFP_NOFS); 559 560 if (!ni) 561 return NULL; 562 563 memset(ni, 0, offsetof(struct ntfs_inode, vfs_inode)); 564 mutex_init(&ni->ni_lock); 565 return &ni->vfs_inode; 566} 567 568static void ntfs_free_inode(struct inode *inode) 569{ 570 struct ntfs_inode *ni = ntfs_i(inode); 571 572 mutex_destroy(&ni->ni_lock); 573 kmem_cache_free(ntfs_inode_cachep, ni); 574} 575 576static void init_once(void *foo) 577{ 578 struct ntfs_inode *ni = foo; 579 580 inode_init_once(&ni->vfs_inode); 581} 582 583/* 584 * Noinline to reduce binary size. 585 */ 586static noinline void ntfs3_put_sbi(struct ntfs_sb_info *sbi) 587{ 588 wnd_close(&sbi->mft.bitmap); 589 wnd_close(&sbi->used.bitmap); 590 591 if (sbi->mft.ni) { 592 iput(&sbi->mft.ni->vfs_inode); 593 sbi->mft.ni = NULL; 594 } 595 596 if (sbi->security.ni) { 597 iput(&sbi->security.ni->vfs_inode); 598 sbi->security.ni = NULL; 599 } 600 601 if (sbi->reparse.ni) { 602 iput(&sbi->reparse.ni->vfs_inode); 603 sbi->reparse.ni = NULL; 604 } 605 606 if (sbi->objid.ni) { 607 iput(&sbi->objid.ni->vfs_inode); 608 sbi->objid.ni = NULL; 609 } 610 611 if (sbi->volume.ni) { 612 iput(&sbi->volume.ni->vfs_inode); 613 sbi->volume.ni = NULL; 614 } 615 616 ntfs_update_mftmirr(sbi, 0); 617 618 indx_clear(&sbi->security.index_sii); 619 indx_clear(&sbi->security.index_sdh); 620 indx_clear(&sbi->reparse.index_r); 621 indx_clear(&sbi->objid.index_o); 622} 623 624static void ntfs3_free_sbi(struct ntfs_sb_info *sbi) 625{ 626 kfree(sbi->new_rec); 627 kvfree(ntfs_put_shared(sbi->upcase)); 628 kvfree(sbi->def_table); 629 kfree(sbi->compress.lznt); 630#ifdef CONFIG_NTFS3_LZX_XPRESS 631 xpress_free_decompressor(sbi->compress.xpress); 632 lzx_free_decompressor(sbi->compress.lzx); 633#endif 634 kfree(sbi); 635} 636 637static void ntfs_put_super(struct super_block *sb) 638{ 639 struct ntfs_sb_info *sbi = sb->s_fs_info; 640 641#ifdef CONFIG_PROC_FS 642 // Remove /proc/fs/ntfs3/.. 643 if (sbi->procdir) { 644 remove_proc_entry("label", sbi->procdir); 645 remove_proc_entry("volinfo", sbi->procdir); 646 remove_proc_entry(sb->s_id, proc_info_root); 647 sbi->procdir = NULL; 648 } 649#endif 650 651 /* Mark rw ntfs as clear, if possible. */ 652 ntfs_set_state(sbi, NTFS_DIRTY_CLEAR); 653 ntfs3_put_sbi(sbi); 654} 655 656static int ntfs_statfs(struct dentry *dentry, struct kstatfs *buf) 657{ 658 struct super_block *sb = dentry->d_sb; 659 struct ntfs_sb_info *sbi = sb->s_fs_info; 660 struct wnd_bitmap *wnd = &sbi->used.bitmap; 661 662 buf->f_type = sb->s_magic; 663 buf->f_bsize = sbi->cluster_size; 664 buf->f_blocks = wnd->nbits; 665 666 buf->f_bfree = buf->f_bavail = wnd_zeroes(wnd); 667 buf->f_fsid.val[0] = sbi->volume.ser_num; 668 buf->f_fsid.val[1] = (sbi->volume.ser_num >> 32); 669 buf->f_namelen = NTFS_NAME_LEN; 670 671 return 0; 672} 673 674static int ntfs_show_options(struct seq_file *m, struct dentry *root) 675{ 676 struct super_block *sb = root->d_sb; 677 struct ntfs_sb_info *sbi = sb->s_fs_info; 678 struct ntfs_mount_options *opts = sbi->options; 679 struct user_namespace *user_ns = seq_user_ns(m); 680 681 seq_printf(m, ",uid=%u", from_kuid_munged(user_ns, opts->fs_uid)); 682 seq_printf(m, ",gid=%u", from_kgid_munged(user_ns, opts->fs_gid)); 683 if (opts->dmask) 684 seq_printf(m, ",dmask=%04o", opts->fs_dmask_inv ^ 0xffff); 685 if (opts->fmask) 686 seq_printf(m, ",fmask=%04o", opts->fs_fmask_inv ^ 0xffff); 687 if (opts->sys_immutable) 688 seq_puts(m, ",sys_immutable"); 689 if (opts->discard) 690 seq_puts(m, ",discard"); 691 if (opts->force) 692 seq_puts(m, ",force"); 693 if (opts->sparse) 694 seq_puts(m, ",sparse"); 695 if (opts->nohidden) 696 seq_puts(m, ",nohidden"); 697 if (opts->hide_dot_files) 698 seq_puts(m, ",hide_dot_files"); 699 if (opts->windows_names) 700 seq_puts(m, ",windows_names"); 701 if (opts->showmeta) 702 seq_puts(m, ",showmeta"); 703 if (sb->s_flags & SB_POSIXACL) 704 seq_puts(m, ",acl"); 705 if (opts->nls) 706 seq_printf(m, ",iocharset=%s", opts->nls->charset); 707 else 708 seq_puts(m, ",iocharset=utf8"); 709 if (opts->prealloc) 710 seq_puts(m, ",prealloc"); 711 if (opts->nocase) 712 seq_puts(m, ",nocase"); 713 714 return 0; 715} 716 717/* 718 * ntfs_shutdown - super_operations::shutdown 719 */ 720static void ntfs_shutdown(struct super_block *sb) 721{ 722 set_bit(NTFS_FLAGS_SHUTDOWN_BIT, &ntfs_sb(sb)->flags); 723} 724 725/* 726 * ntfs_sync_fs - super_operations::sync_fs 727 */ 728static int ntfs_sync_fs(struct super_block *sb, int wait) 729{ 730 int err = 0, err2; 731 struct ntfs_sb_info *sbi = sb->s_fs_info; 732 struct ntfs_inode *ni; 733 struct inode *inode; 734 735 if (unlikely(ntfs3_forced_shutdown(sb))) 736 return -EIO; 737 738 ni = sbi->security.ni; 739 if (ni) { 740 inode = &ni->vfs_inode; 741 err2 = _ni_write_inode(inode, wait); 742 if (err2 && !err) 743 err = err2; 744 } 745 746 ni = sbi->objid.ni; 747 if (ni) { 748 inode = &ni->vfs_inode; 749 err2 = _ni_write_inode(inode, wait); 750 if (err2 && !err) 751 err = err2; 752 } 753 754 ni = sbi->reparse.ni; 755 if (ni) { 756 inode = &ni->vfs_inode; 757 err2 = _ni_write_inode(inode, wait); 758 if (err2 && !err) 759 err = err2; 760 } 761 762 if (!err) 763 ntfs_set_state(sbi, NTFS_DIRTY_CLEAR); 764 765 ntfs_update_mftmirr(sbi, wait); 766 767 return err; 768} 769 770static const struct super_operations ntfs_sops = { 771 .alloc_inode = ntfs_alloc_inode, 772 .free_inode = ntfs_free_inode, 773 .evict_inode = ntfs_evict_inode, 774 .put_super = ntfs_put_super, 775 .statfs = ntfs_statfs, 776 .show_options = ntfs_show_options, 777 .shutdown = ntfs_shutdown, 778 .sync_fs = ntfs_sync_fs, 779 .write_inode = ntfs3_write_inode, 780}; 781 782static struct inode *ntfs_export_get_inode(struct super_block *sb, u64 ino, 783 u32 generation) 784{ 785 struct MFT_REF ref; 786 struct inode *inode; 787 788 ref.low = cpu_to_le32(ino); 789#ifdef CONFIG_NTFS3_64BIT_CLUSTER 790 ref.high = cpu_to_le16(ino >> 32); 791#else 792 ref.high = 0; 793#endif 794 ref.seq = cpu_to_le16(generation); 795 796 inode = ntfs_iget5(sb, &ref, NULL); 797 if (!IS_ERR(inode) && is_bad_inode(inode)) { 798 iput(inode); 799 inode = ERR_PTR(-ESTALE); 800 } 801 802 return inode; 803} 804 805static struct dentry *ntfs_fh_to_dentry(struct super_block *sb, struct fid *fid, 806 int fh_len, int fh_type) 807{ 808 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 809 ntfs_export_get_inode); 810} 811 812static struct dentry *ntfs_fh_to_parent(struct super_block *sb, struct fid *fid, 813 int fh_len, int fh_type) 814{ 815 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 816 ntfs_export_get_inode); 817} 818 819/* TODO: == ntfs_sync_inode */ 820static int ntfs_nfs_commit_metadata(struct inode *inode) 821{ 822 return _ni_write_inode(inode, 1); 823} 824 825static const struct export_operations ntfs_export_ops = { 826 .fh_to_dentry = ntfs_fh_to_dentry, 827 .fh_to_parent = ntfs_fh_to_parent, 828 .get_parent = ntfs3_get_parent, 829 .commit_metadata = ntfs_nfs_commit_metadata, 830}; 831 832/* 833 * format_size_gb - Return Gb,Mb to print with "%u.%02u Gb". 834 */ 835static u32 format_size_gb(const u64 bytes, u32 *mb) 836{ 837 /* Do simple right 30 bit shift of 64 bit value. */ 838 u64 kbytes = bytes >> 10; 839 u32 kbytes32 = kbytes; 840 841 *mb = (100 * (kbytes32 & 0xfffff) + 0x7ffff) >> 20; 842 if (*mb >= 100) 843 *mb = 99; 844 845 return (kbytes32 >> 20) | (((u32)(kbytes >> 32)) << 12); 846} 847 848static u32 true_sectors_per_clst(const struct NTFS_BOOT *boot) 849{ 850 if (boot->sectors_per_clusters <= 0x80) 851 return boot->sectors_per_clusters; 852 if (boot->sectors_per_clusters >= 0xf4) /* limit shift to 2MB max */ 853 return 1U << (-(s8)boot->sectors_per_clusters); 854 return -EINVAL; 855} 856 857/* 858 * ntfs_init_from_boot - Init internal info from on-disk boot sector. 859 * 860 * NTFS mount begins from boot - special formatted 512 bytes. 861 * There are two boots: the first and the last 512 bytes of volume. 862 * The content of boot is not changed during ntfs life. 863 * 864 * NOTE: ntfs.sys checks only first (primary) boot. 865 * chkdsk checks both boots. 866 */ 867static int ntfs_init_from_boot(struct super_block *sb, u32 sector_size, 868 u64 dev_size, struct NTFS_BOOT **boot2) 869{ 870 struct ntfs_sb_info *sbi = sb->s_fs_info; 871 int err; 872 u32 mb, gb, boot_sector_size, sct_per_clst, record_size; 873 u64 sectors, clusters, mlcn, mlcn2, dev_size0; 874 struct NTFS_BOOT *boot; 875 struct buffer_head *bh; 876 struct MFT_REC *rec; 877 u16 fn, ao; 878 u8 cluster_bits; 879 u32 boot_off = 0; 880 sector_t boot_block = 0; 881 const char *hint = "Primary boot"; 882 883 /* Save original dev_size. Used with alternative boot. */ 884 dev_size0 = dev_size; 885 886 sbi->volume.blocks = dev_size >> PAGE_SHIFT; 887 888read_boot: 889 bh = ntfs_bread(sb, boot_block); 890 if (!bh) 891 return boot_block ? -EINVAL : -EIO; 892 893 err = -EINVAL; 894 895 /* Corrupted image; do not read OOB */ 896 if (bh->b_size - sizeof(*boot) < boot_off) 897 goto out; 898 899 boot = (struct NTFS_BOOT *)Add2Ptr(bh->b_data, boot_off); 900 901 if (memcmp(boot->system_id, "NTFS ", sizeof("NTFS ") - 1)) { 902 ntfs_err(sb, "%s signature is not NTFS.", hint); 903 goto out; 904 } 905 906 /* 0x55AA is not mandaroty. Thanks Maxim Suhanov*/ 907 /*if (0x55 != boot->boot_magic[0] || 0xAA != boot->boot_magic[1]) 908 * goto out; 909 */ 910 911 boot_sector_size = ((u32)boot->bytes_per_sector[1] << 8) | 912 boot->bytes_per_sector[0]; 913 if (boot_sector_size < SECTOR_SIZE || 914 !is_power_of_2(boot_sector_size)) { 915 ntfs_err(sb, "%s: invalid bytes per sector %u.", hint, 916 boot_sector_size); 917 goto out; 918 } 919 920 /* cluster size: 512, 1K, 2K, 4K, ... 2M */ 921 sct_per_clst = true_sectors_per_clst(boot); 922 if ((int)sct_per_clst < 0 || !is_power_of_2(sct_per_clst)) { 923 ntfs_err(sb, "%s: invalid sectors per cluster %u.", hint, 924 sct_per_clst); 925 goto out; 926 } 927 928 sbi->cluster_size = boot_sector_size * sct_per_clst; 929 sbi->cluster_bits = cluster_bits = blksize_bits(sbi->cluster_size); 930 sbi->cluster_mask = sbi->cluster_size - 1; 931 sbi->cluster_mask_inv = ~(u64)sbi->cluster_mask; 932 933 mlcn = le64_to_cpu(boot->mft_clst); 934 mlcn2 = le64_to_cpu(boot->mft2_clst); 935 sectors = le64_to_cpu(boot->sectors_per_volume); 936 937 if (mlcn * sct_per_clst >= sectors || mlcn2 * sct_per_clst >= sectors) { 938 ntfs_err( 939 sb, 940 "%s: start of MFT 0x%llx (0x%llx) is out of volume 0x%llx.", 941 hint, mlcn, mlcn2, sectors); 942 goto out; 943 } 944 945 if (boot->record_size >= 0) { 946 record_size = (u32)boot->record_size << cluster_bits; 947 } else if (-boot->record_size <= MAXIMUM_SHIFT_BYTES_PER_MFT) { 948 record_size = 1u << (-boot->record_size); 949 } else { 950 ntfs_err(sb, "%s: invalid record size %d.", hint, 951 boot->record_size); 952 goto out; 953 } 954 955 sbi->record_size = record_size; 956 sbi->record_bits = blksize_bits(record_size); 957 sbi->attr_size_tr = (5 * record_size >> 4); // ~320 bytes 958 959 /* Check MFT record size. */ 960 if (record_size < SECTOR_SIZE || !is_power_of_2(record_size)) { 961 ntfs_err(sb, "%s: invalid bytes per MFT record %u (%d).", hint, 962 record_size, boot->record_size); 963 goto out; 964 } 965 966 if (record_size > MAXIMUM_BYTES_PER_MFT) { 967 ntfs_err(sb, "Unsupported bytes per MFT record %u.", 968 record_size); 969 goto out; 970 } 971 972 if (boot->index_size >= 0) { 973 sbi->index_size = (u32)boot->index_size << cluster_bits; 974 } else if (-boot->index_size <= MAXIMUM_SHIFT_BYTES_PER_INDEX) { 975 sbi->index_size = 1u << (-boot->index_size); 976 } else { 977 ntfs_err(sb, "%s: invalid index size %d.", hint, 978 boot->index_size); 979 goto out; 980 } 981 982 /* Check index record size. */ 983 if (sbi->index_size < SECTOR_SIZE || !is_power_of_2(sbi->index_size)) { 984 ntfs_err(sb, "%s: invalid bytes per index %u(%d).", hint, 985 sbi->index_size, boot->index_size); 986 goto out; 987 } 988 989 if (sbi->index_size > MAXIMUM_BYTES_PER_INDEX) { 990 ntfs_err(sb, "%s: unsupported bytes per index %u.", hint, 991 sbi->index_size); 992 goto out; 993 } 994 995 sbi->volume.size = sectors * boot_sector_size; 996 997 gb = format_size_gb(sbi->volume.size + boot_sector_size, &mb); 998 999 /* 1000 * - Volume formatted and mounted with the same sector size. 1001 * - Volume formatted 4K and mounted as 512. 1002 * - Volume formatted 512 and mounted as 4K. 1003 */ 1004 if (boot_sector_size != sector_size) { 1005 ntfs_warn( 1006 sb, 1007 "Different NTFS sector size (%u) and media sector size (%u).", 1008 boot_sector_size, sector_size); 1009 dev_size += sector_size - 1; 1010 } 1011 1012 sbi->mft.lbo = mlcn << cluster_bits; 1013 sbi->mft.lbo2 = mlcn2 << cluster_bits; 1014 1015 /* Compare boot's cluster and sector. */ 1016 if (sbi->cluster_size < boot_sector_size) { 1017 ntfs_err(sb, "%s: invalid bytes per cluster (%u).", hint, 1018 sbi->cluster_size); 1019 goto out; 1020 } 1021 1022 /* Compare boot's cluster and media sector. */ 1023 if (sbi->cluster_size < sector_size) { 1024 /* No way to use ntfs_get_block in this case. */ 1025 ntfs_err( 1026 sb, 1027 "Failed to mount 'cause NTFS's cluster size (%u) is less than media sector size (%u).", 1028 sbi->cluster_size, sector_size); 1029 goto out; 1030 } 1031 1032 sbi->max_bytes_per_attr = 1033 record_size - ALIGN(MFTRECORD_FIXUP_OFFSET, 8) - 1034 ALIGN(((record_size >> SECTOR_SHIFT) * sizeof(short)), 8) - 1035 ALIGN(sizeof(enum ATTR_TYPE), 8); 1036 1037 sbi->volume.ser_num = le64_to_cpu(boot->serial_num); 1038 1039 /* Warning if RAW volume. */ 1040 if (dev_size < sbi->volume.size + boot_sector_size) { 1041 u32 mb0, gb0; 1042 1043 gb0 = format_size_gb(dev_size, &mb0); 1044 ntfs_warn( 1045 sb, 1046 "RAW NTFS volume: Filesystem size %u.%02u Gb > volume size %u.%02u Gb. Mount in read-only.", 1047 gb, mb, gb0, mb0); 1048 sb->s_flags |= SB_RDONLY; 1049 } 1050 1051 clusters = sbi->volume.size >> cluster_bits; 1052#ifndef CONFIG_NTFS3_64BIT_CLUSTER 1053 /* 32 bits per cluster. */ 1054 if (clusters >> 32) { 1055 ntfs_notice( 1056 sb, 1057 "NTFS %u.%02u Gb is too big to use 32 bits per cluster.", 1058 gb, mb); 1059 goto out; 1060 } 1061#elif BITS_PER_LONG < 64 1062#error "CONFIG_NTFS3_64BIT_CLUSTER incompatible in 32 bit OS" 1063#endif 1064 1065 sbi->used.bitmap.nbits = clusters; 1066 1067 rec = kzalloc(record_size, GFP_NOFS); 1068 if (!rec) { 1069 err = -ENOMEM; 1070 goto out; 1071 } 1072 1073 sbi->new_rec = rec; 1074 rec->rhdr.sign = NTFS_FILE_SIGNATURE; 1075 rec->rhdr.fix_off = cpu_to_le16(MFTRECORD_FIXUP_OFFSET); 1076 fn = (sbi->record_size >> SECTOR_SHIFT) + 1; 1077 rec->rhdr.fix_num = cpu_to_le16(fn); 1078 ao = ALIGN(MFTRECORD_FIXUP_OFFSET + sizeof(short) * fn, 8); 1079 rec->attr_off = cpu_to_le16(ao); 1080 rec->used = cpu_to_le32(ao + ALIGN(sizeof(enum ATTR_TYPE), 8)); 1081 rec->total = cpu_to_le32(sbi->record_size); 1082 ((struct ATTRIB *)Add2Ptr(rec, ao))->type = ATTR_END; 1083 1084 sb_set_blocksize(sb, min_t(u32, sbi->cluster_size, PAGE_SIZE)); 1085 1086 sbi->block_mask = sb->s_blocksize - 1; 1087 sbi->blocks_per_cluster = sbi->cluster_size >> sb->s_blocksize_bits; 1088 sbi->volume.blocks = sbi->volume.size >> sb->s_blocksize_bits; 1089 1090 /* Maximum size for normal files. */ 1091 sbi->maxbytes = (clusters << cluster_bits) - 1; 1092 1093#ifdef CONFIG_NTFS3_64BIT_CLUSTER 1094 if (clusters >= (1ull << (64 - cluster_bits))) 1095 sbi->maxbytes = -1; 1096 sbi->maxbytes_sparse = -1; 1097 sb->s_maxbytes = MAX_LFS_FILESIZE; 1098#else 1099 /* Maximum size for sparse file. */ 1100 sbi->maxbytes_sparse = (1ull << (cluster_bits + 32)) - 1; 1101 sb->s_maxbytes = 0xFFFFFFFFull << cluster_bits; 1102#endif 1103 1104 /* 1105 * Compute the MFT zone at two steps. 1106 * It would be nice if we are able to allocate 1/8 of 1107 * total clusters for MFT but not more then 512 MB. 1108 */ 1109 sbi->zone_max = min_t(CLST, 0x20000000 >> cluster_bits, clusters >> 3); 1110 1111 err = 0; 1112 1113 if (bh->b_blocknr && !sb_rdonly(sb)) { 1114 /* 1115 * Alternative boot is ok but primary is not ok. 1116 * Do not update primary boot here 'cause it may be faked boot. 1117 * Let ntfs to be mounted and update boot later. 1118 */ 1119 *boot2 = kmemdup(boot, sizeof(*boot), GFP_NOFS | __GFP_NOWARN); 1120 } 1121 1122out: 1123 brelse(bh); 1124 1125 if (err == -EINVAL && !boot_block && dev_size0 > PAGE_SHIFT) { 1126 u32 block_size = min_t(u32, sector_size, PAGE_SIZE); 1127 u64 lbo = dev_size0 - sizeof(*boot); 1128 1129 boot_block = lbo >> blksize_bits(block_size); 1130 boot_off = lbo & (block_size - 1); 1131 if (boot_block && block_size >= boot_off + sizeof(*boot)) { 1132 /* 1133 * Try alternative boot (last sector) 1134 */ 1135 sb_set_blocksize(sb, block_size); 1136 hint = "Alternative boot"; 1137 dev_size = dev_size0; /* restore original size. */ 1138 goto read_boot; 1139 } 1140 } 1141 1142 return err; 1143} 1144 1145/* 1146 * ntfs_fill_super - Try to mount. 1147 */ 1148static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc) 1149{ 1150 int err; 1151 struct ntfs_sb_info *sbi = sb->s_fs_info; 1152 struct block_device *bdev = sb->s_bdev; 1153 struct ntfs_mount_options *options; 1154 struct inode *inode; 1155 struct ntfs_inode *ni; 1156 size_t i, tt, bad_len, bad_frags; 1157 CLST vcn, lcn, len; 1158 struct ATTRIB *attr; 1159 const struct VOLUME_INFO *info; 1160 u32 idx, done, bytes; 1161 struct ATTR_DEF_ENTRY *t; 1162 u16 *shared; 1163 struct MFT_REF ref; 1164 bool ro = sb_rdonly(sb); 1165 struct NTFS_BOOT *boot2 = NULL; 1166 1167 ref.high = 0; 1168 1169 sbi->sb = sb; 1170 sbi->options = options = fc->fs_private; 1171 fc->fs_private = NULL; 1172 sb->s_flags |= SB_NODIRATIME; 1173 sb->s_magic = 0x7366746e; // "ntfs" 1174 sb->s_op = &ntfs_sops; 1175 sb->s_export_op = &ntfs_export_ops; 1176 sb->s_time_gran = NTFS_TIME_GRAN; // 100 nsec 1177 sb->s_xattr = ntfs_xattr_handlers; 1178 sb->s_d_op = options->nocase ? &ntfs_dentry_ops : NULL; 1179 1180 options->nls = ntfs_load_nls(options->nls_name); 1181 if (IS_ERR(options->nls)) { 1182 options->nls = NULL; 1183 errorf(fc, "Cannot load nls %s", options->nls_name); 1184 err = -EINVAL; 1185 goto out; 1186 } 1187 1188 if (bdev_max_discard_sectors(bdev) && bdev_discard_granularity(bdev)) { 1189 sbi->discard_granularity = bdev_discard_granularity(bdev); 1190 sbi->discard_granularity_mask_inv = 1191 ~(u64)(sbi->discard_granularity - 1); 1192 } 1193 1194 /* Parse boot. */ 1195 err = ntfs_init_from_boot(sb, bdev_logical_block_size(bdev), 1196 bdev_nr_bytes(bdev), &boot2); 1197 if (err) 1198 goto out; 1199 1200 /* 1201 * Load $Volume. This should be done before $LogFile 1202 * 'cause 'sbi->volume.ni' is used 'ntfs_set_state'. 1203 */ 1204 ref.low = cpu_to_le32(MFT_REC_VOL); 1205 ref.seq = cpu_to_le16(MFT_REC_VOL); 1206 inode = ntfs_iget5(sb, &ref, &NAME_VOLUME); 1207 if (IS_ERR(inode)) { 1208 err = PTR_ERR(inode); 1209 ntfs_err(sb, "Failed to load $Volume (%d).", err); 1210 goto out; 1211 } 1212 1213 ni = ntfs_i(inode); 1214 1215 /* Load and save label (not necessary). */ 1216 attr = ni_find_attr(ni, NULL, NULL, ATTR_LABEL, NULL, 0, NULL, NULL); 1217 1218 if (!attr) { 1219 /* It is ok if no ATTR_LABEL */ 1220 } else if (!attr->non_res && !is_attr_ext(attr)) { 1221 /* $AttrDef allows labels to be up to 128 symbols. */ 1222 err = utf16s_to_utf8s(resident_data(attr), 1223 le32_to_cpu(attr->res.data_size) >> 1, 1224 UTF16_LITTLE_ENDIAN, sbi->volume.label, 1225 sizeof(sbi->volume.label)); 1226 if (err < 0) 1227 sbi->volume.label[0] = 0; 1228 } else { 1229 /* Should we break mounting here? */ 1230 //err = -EINVAL; 1231 //goto put_inode_out; 1232 } 1233 1234 attr = ni_find_attr(ni, attr, NULL, ATTR_VOL_INFO, NULL, 0, NULL, NULL); 1235 if (!attr || is_attr_ext(attr) || 1236 !(info = resident_data_ex(attr, SIZEOF_ATTRIBUTE_VOLUME_INFO))) { 1237 ntfs_err(sb, "$Volume is corrupted."); 1238 err = -EINVAL; 1239 goto put_inode_out; 1240 } 1241 1242 sbi->volume.major_ver = info->major_ver; 1243 sbi->volume.minor_ver = info->minor_ver; 1244 sbi->volume.flags = info->flags; 1245 sbi->volume.ni = ni; 1246 if (info->flags & VOLUME_FLAG_DIRTY) { 1247 sbi->volume.real_dirty = true; 1248 ntfs_info(sb, "It is recommened to use chkdsk."); 1249 } 1250 1251 /* Load $MFTMirr to estimate recs_mirr. */ 1252 ref.low = cpu_to_le32(MFT_REC_MIRR); 1253 ref.seq = cpu_to_le16(MFT_REC_MIRR); 1254 inode = ntfs_iget5(sb, &ref, &NAME_MIRROR); 1255 if (IS_ERR(inode)) { 1256 err = PTR_ERR(inode); 1257 ntfs_err(sb, "Failed to load $MFTMirr (%d).", err); 1258 goto out; 1259 } 1260 1261 sbi->mft.recs_mirr = ntfs_up_cluster(sbi, inode->i_size) >> 1262 sbi->record_bits; 1263 1264 iput(inode); 1265 1266 /* Load LogFile to replay. */ 1267 ref.low = cpu_to_le32(MFT_REC_LOG); 1268 ref.seq = cpu_to_le16(MFT_REC_LOG); 1269 inode = ntfs_iget5(sb, &ref, &NAME_LOGFILE); 1270 if (IS_ERR(inode)) { 1271 err = PTR_ERR(inode); 1272 ntfs_err(sb, "Failed to load \x24LogFile (%d).", err); 1273 goto out; 1274 } 1275 1276 ni = ntfs_i(inode); 1277 1278 err = ntfs_loadlog_and_replay(ni, sbi); 1279 if (err) 1280 goto put_inode_out; 1281 1282 iput(inode); 1283 1284 if ((sbi->flags & NTFS_FLAGS_NEED_REPLAY) && !ro) { 1285 ntfs_warn(sb, "failed to replay log file. Can't mount rw!"); 1286 err = -EINVAL; 1287 goto out; 1288 } 1289 1290 if ((sbi->volume.flags & VOLUME_FLAG_DIRTY) && !ro && !options->force) { 1291 ntfs_warn(sb, "volume is dirty and \"force\" flag is not set!"); 1292 err = -EINVAL; 1293 goto out; 1294 } 1295 1296 /* Load $MFT. */ 1297 ref.low = cpu_to_le32(MFT_REC_MFT); 1298 ref.seq = cpu_to_le16(1); 1299 1300 inode = ntfs_iget5(sb, &ref, &NAME_MFT); 1301 if (IS_ERR(inode)) { 1302 err = PTR_ERR(inode); 1303 ntfs_err(sb, "Failed to load $MFT (%d).", err); 1304 goto out; 1305 } 1306 1307 ni = ntfs_i(inode); 1308 1309 sbi->mft.used = ni->i_valid >> sbi->record_bits; 1310 tt = inode->i_size >> sbi->record_bits; 1311 sbi->mft.next_free = MFT_REC_USER; 1312 1313 err = wnd_init(&sbi->mft.bitmap, sb, tt); 1314 if (err) 1315 goto put_inode_out; 1316 1317 err = ni_load_all_mi(ni); 1318 if (err) { 1319 ntfs_err(sb, "Failed to load $MFT's subrecords (%d).", err); 1320 goto put_inode_out; 1321 } 1322 1323 sbi->mft.ni = ni; 1324 1325 /* Load $Bitmap. */ 1326 ref.low = cpu_to_le32(MFT_REC_BITMAP); 1327 ref.seq = cpu_to_le16(MFT_REC_BITMAP); 1328 inode = ntfs_iget5(sb, &ref, &NAME_BITMAP); 1329 if (IS_ERR(inode)) { 1330 err = PTR_ERR(inode); 1331 ntfs_err(sb, "Failed to load $Bitmap (%d).", err); 1332 goto out; 1333 } 1334 1335#ifndef CONFIG_NTFS3_64BIT_CLUSTER 1336 if (inode->i_size >> 32) { 1337 err = -EINVAL; 1338 goto put_inode_out; 1339 } 1340#endif 1341 1342 /* Check bitmap boundary. */ 1343 tt = sbi->used.bitmap.nbits; 1344 if (inode->i_size < bitmap_size(tt)) { 1345 ntfs_err(sb, "$Bitmap is corrupted."); 1346 err = -EINVAL; 1347 goto put_inode_out; 1348 } 1349 1350 err = wnd_init(&sbi->used.bitmap, sb, tt); 1351 if (err) { 1352 ntfs_err(sb, "Failed to initialize $Bitmap (%d).", err); 1353 goto put_inode_out; 1354 } 1355 1356 iput(inode); 1357 1358 /* Compute the MFT zone. */ 1359 err = ntfs_refresh_zone(sbi); 1360 if (err) { 1361 ntfs_err(sb, "Failed to initialize MFT zone (%d).", err); 1362 goto out; 1363 } 1364 1365 /* Load $BadClus. */ 1366 ref.low = cpu_to_le32(MFT_REC_BADCLUST); 1367 ref.seq = cpu_to_le16(MFT_REC_BADCLUST); 1368 inode = ntfs_iget5(sb, &ref, &NAME_BADCLUS); 1369 if (IS_ERR(inode)) { 1370 err = PTR_ERR(inode); 1371 ntfs_err(sb, "Failed to load $BadClus (%d).", err); 1372 goto out; 1373 } 1374 1375 ni = ntfs_i(inode); 1376 bad_len = bad_frags = 0; 1377 for (i = 0; run_get_entry(&ni->file.run, i, &vcn, &lcn, &len); i++) { 1378 if (lcn == SPARSE_LCN) 1379 continue; 1380 1381 bad_len += len; 1382 bad_frags += 1; 1383 if (ro) 1384 continue; 1385 1386 if (wnd_set_used_safe(&sbi->used.bitmap, lcn, len, &tt) || tt) { 1387 /* Bad blocks marked as free in bitmap. */ 1388 ntfs_set_state(sbi, NTFS_DIRTY_ERROR); 1389 } 1390 } 1391 if (bad_len) { 1392 /* 1393 * Notice about bad blocks. 1394 * In normal cases these blocks are marked as used in bitmap. 1395 * And we never allocate space in it. 1396 */ 1397 ntfs_notice(sb, 1398 "Volume contains %zu bad blocks in %zu fragments.", 1399 bad_len, bad_frags); 1400 } 1401 iput(inode); 1402 1403 /* Load $AttrDef. */ 1404 ref.low = cpu_to_le32(MFT_REC_ATTR); 1405 ref.seq = cpu_to_le16(MFT_REC_ATTR); 1406 inode = ntfs_iget5(sb, &ref, &NAME_ATTRDEF); 1407 if (IS_ERR(inode)) { 1408 err = PTR_ERR(inode); 1409 ntfs_err(sb, "Failed to load $AttrDef (%d)", err); 1410 goto out; 1411 } 1412 1413 /* 1414 * Typical $AttrDef contains up to 20 entries. 1415 * Check for extremely large/small size. 1416 */ 1417 if (inode->i_size < sizeof(struct ATTR_DEF_ENTRY) || 1418 inode->i_size > 100 * sizeof(struct ATTR_DEF_ENTRY)) { 1419 ntfs_err(sb, "Looks like $AttrDef is corrupted (size=%llu).", 1420 inode->i_size); 1421 err = -EINVAL; 1422 goto put_inode_out; 1423 } 1424 1425 bytes = inode->i_size; 1426 sbi->def_table = t = kvmalloc(bytes, GFP_KERNEL); 1427 if (!t) { 1428 err = -ENOMEM; 1429 goto put_inode_out; 1430 } 1431 1432 for (done = idx = 0; done < bytes; done += PAGE_SIZE, idx++) { 1433 unsigned long tail = bytes - done; 1434 struct page *page = ntfs_map_page(inode->i_mapping, idx); 1435 1436 if (IS_ERR(page)) { 1437 err = PTR_ERR(page); 1438 ntfs_err(sb, "Failed to read $AttrDef (%d).", err); 1439 goto put_inode_out; 1440 } 1441 memcpy(Add2Ptr(t, done), page_address(page), 1442 min(PAGE_SIZE, tail)); 1443 ntfs_unmap_page(page); 1444 1445 if (!idx && ATTR_STD != t->type) { 1446 ntfs_err(sb, "$AttrDef is corrupted."); 1447 err = -EINVAL; 1448 goto put_inode_out; 1449 } 1450 } 1451 1452 t += 1; 1453 sbi->def_entries = 1; 1454 done = sizeof(struct ATTR_DEF_ENTRY); 1455 sbi->reparse.max_size = MAXIMUM_REPARSE_DATA_BUFFER_SIZE; 1456 sbi->ea_max_size = 0x10000; /* default formatter value */ 1457 1458 while (done + sizeof(struct ATTR_DEF_ENTRY) <= bytes) { 1459 u32 t32 = le32_to_cpu(t->type); 1460 u64 sz = le64_to_cpu(t->max_sz); 1461 1462 if ((t32 & 0xF) || le32_to_cpu(t[-1].type) >= t32) 1463 break; 1464 1465 if (t->type == ATTR_REPARSE) 1466 sbi->reparse.max_size = sz; 1467 else if (t->type == ATTR_EA) 1468 sbi->ea_max_size = sz; 1469 1470 done += sizeof(struct ATTR_DEF_ENTRY); 1471 t += 1; 1472 sbi->def_entries += 1; 1473 } 1474 iput(inode); 1475 1476 /* Load $UpCase. */ 1477 ref.low = cpu_to_le32(MFT_REC_UPCASE); 1478 ref.seq = cpu_to_le16(MFT_REC_UPCASE); 1479 inode = ntfs_iget5(sb, &ref, &NAME_UPCASE); 1480 if (IS_ERR(inode)) { 1481 err = PTR_ERR(inode); 1482 ntfs_err(sb, "Failed to load $UpCase (%d).", err); 1483 goto out; 1484 } 1485 1486 if (inode->i_size != 0x10000 * sizeof(short)) { 1487 err = -EINVAL; 1488 ntfs_err(sb, "$UpCase is corrupted."); 1489 goto put_inode_out; 1490 } 1491 1492 for (idx = 0; idx < (0x10000 * sizeof(short) >> PAGE_SHIFT); idx++) { 1493 const __le16 *src; 1494 u16 *dst = Add2Ptr(sbi->upcase, idx << PAGE_SHIFT); 1495 struct page *page = ntfs_map_page(inode->i_mapping, idx); 1496 1497 if (IS_ERR(page)) { 1498 err = PTR_ERR(page); 1499 ntfs_err(sb, "Failed to read $UpCase (%d).", err); 1500 goto put_inode_out; 1501 } 1502 1503 src = page_address(page); 1504 1505#ifdef __BIG_ENDIAN 1506 for (i = 0; i < PAGE_SIZE / sizeof(u16); i++) 1507 *dst++ = le16_to_cpu(*src++); 1508#else 1509 memcpy(dst, src, PAGE_SIZE); 1510#endif 1511 ntfs_unmap_page(page); 1512 } 1513 1514 shared = ntfs_set_shared(sbi->upcase, 0x10000 * sizeof(short)); 1515 if (shared && sbi->upcase != shared) { 1516 kvfree(sbi->upcase); 1517 sbi->upcase = shared; 1518 } 1519 1520 iput(inode); 1521 1522 if (is_ntfs3(sbi)) { 1523 /* Load $Secure. */ 1524 err = ntfs_security_init(sbi); 1525 if (err) { 1526 ntfs_err(sb, "Failed to initialize $Secure (%d).", err); 1527 goto out; 1528 } 1529 1530 /* Load $Extend. */ 1531 err = ntfs_extend_init(sbi); 1532 if (err) { 1533 ntfs_warn(sb, "Failed to initialize $Extend."); 1534 goto load_root; 1535 } 1536 1537 /* Load $Extend/$Reparse. */ 1538 err = ntfs_reparse_init(sbi); 1539 if (err) { 1540 ntfs_warn(sb, "Failed to initialize $Extend/$Reparse."); 1541 goto load_root; 1542 } 1543 1544 /* Load $Extend/$ObjId. */ 1545 err = ntfs_objid_init(sbi); 1546 if (err) { 1547 ntfs_warn(sb, "Failed to initialize $Extend/$ObjId."); 1548 goto load_root; 1549 } 1550 } 1551 1552load_root: 1553 /* Load root. */ 1554 ref.low = cpu_to_le32(MFT_REC_ROOT); 1555 ref.seq = cpu_to_le16(MFT_REC_ROOT); 1556 inode = ntfs_iget5(sb, &ref, &NAME_ROOT); 1557 if (IS_ERR(inode)) { 1558 err = PTR_ERR(inode); 1559 ntfs_err(sb, "Failed to load root (%d).", err); 1560 goto out; 1561 } 1562 1563 /* 1564 * Final check. Looks like this case should never occurs. 1565 */ 1566 if (!inode->i_op) { 1567 err = -EINVAL; 1568 ntfs_err(sb, "Failed to load root (%d).", err); 1569 goto put_inode_out; 1570 } 1571 1572 sb->s_root = d_make_root(inode); 1573 if (!sb->s_root) { 1574 err = -ENOMEM; 1575 goto put_inode_out; 1576 } 1577 1578 if (boot2) { 1579 /* 1580 * Alternative boot is ok but primary is not ok. 1581 * Volume is recognized as NTFS. Update primary boot. 1582 */ 1583 struct buffer_head *bh0 = sb_getblk(sb, 0); 1584 if (bh0) { 1585 if (buffer_locked(bh0)) 1586 __wait_on_buffer(bh0); 1587 1588 lock_buffer(bh0); 1589 memcpy(bh0->b_data, boot2, sizeof(*boot2)); 1590 set_buffer_uptodate(bh0); 1591 mark_buffer_dirty(bh0); 1592 unlock_buffer(bh0); 1593 if (!sync_dirty_buffer(bh0)) 1594 ntfs_warn(sb, "primary boot is updated"); 1595 put_bh(bh0); 1596 } 1597 1598 kfree(boot2); 1599 } 1600 1601#ifdef CONFIG_PROC_FS 1602 /* Create /proc/fs/ntfs3/.. */ 1603 if (proc_info_root) { 1604 struct proc_dir_entry *e = proc_mkdir(sb->s_id, proc_info_root); 1605 static_assert((S_IRUGO | S_IWUSR) == 0644); 1606 if (e) { 1607 proc_create_data("volinfo", S_IRUGO, e, 1608 &ntfs3_volinfo_fops, sb); 1609 proc_create_data("label", S_IRUGO | S_IWUSR, e, 1610 &ntfs3_label_fops, sb); 1611 sbi->procdir = e; 1612 } 1613 } 1614#endif 1615 1616 return 0; 1617 1618put_inode_out: 1619 iput(inode); 1620out: 1621 ntfs3_put_sbi(sbi); 1622 kfree(boot2); 1623 ntfs3_put_sbi(sbi); 1624 return err; 1625} 1626 1627void ntfs_unmap_meta(struct super_block *sb, CLST lcn, CLST len) 1628{ 1629 struct ntfs_sb_info *sbi = sb->s_fs_info; 1630 struct block_device *bdev = sb->s_bdev; 1631 sector_t devblock = (u64)lcn * sbi->blocks_per_cluster; 1632 unsigned long blocks = (u64)len * sbi->blocks_per_cluster; 1633 unsigned long cnt = 0; 1634 unsigned long limit = global_zone_page_state(NR_FREE_PAGES) 1635 << (PAGE_SHIFT - sb->s_blocksize_bits); 1636 1637 if (limit >= 0x2000) 1638 limit -= 0x1000; 1639 else if (limit < 32) 1640 limit = 32; 1641 else 1642 limit >>= 1; 1643 1644 while (blocks--) { 1645 clean_bdev_aliases(bdev, devblock++, 1); 1646 if (cnt++ >= limit) { 1647 sync_blockdev(bdev); 1648 cnt = 0; 1649 } 1650 } 1651} 1652 1653/* 1654 * ntfs_discard - Issue a discard request (trim for SSD). 1655 */ 1656int ntfs_discard(struct ntfs_sb_info *sbi, CLST lcn, CLST len) 1657{ 1658 int err; 1659 u64 lbo, bytes, start, end; 1660 struct super_block *sb; 1661 1662 if (sbi->used.next_free_lcn == lcn + len) 1663 sbi->used.next_free_lcn = lcn; 1664 1665 if (sbi->flags & NTFS_FLAGS_NODISCARD) 1666 return -EOPNOTSUPP; 1667 1668 if (!sbi->options->discard) 1669 return -EOPNOTSUPP; 1670 1671 lbo = (u64)lcn << sbi->cluster_bits; 1672 bytes = (u64)len << sbi->cluster_bits; 1673 1674 /* Align up 'start' on discard_granularity. */ 1675 start = (lbo + sbi->discard_granularity - 1) & 1676 sbi->discard_granularity_mask_inv; 1677 /* Align down 'end' on discard_granularity. */ 1678 end = (lbo + bytes) & sbi->discard_granularity_mask_inv; 1679 1680 sb = sbi->sb; 1681 if (start >= end) 1682 return 0; 1683 1684 err = blkdev_issue_discard(sb->s_bdev, start >> 9, (end - start) >> 9, 1685 GFP_NOFS); 1686 1687 if (err == -EOPNOTSUPP) 1688 sbi->flags |= NTFS_FLAGS_NODISCARD; 1689 1690 return err; 1691} 1692 1693static int ntfs_fs_get_tree(struct fs_context *fc) 1694{ 1695 return get_tree_bdev(fc, ntfs_fill_super); 1696} 1697 1698/* 1699 * ntfs_fs_free - Free fs_context. 1700 * 1701 * Note that this will be called after fill_super and reconfigure 1702 * even when they pass. So they have to take pointers if they pass. 1703 */ 1704static void ntfs_fs_free(struct fs_context *fc) 1705{ 1706 struct ntfs_mount_options *opts = fc->fs_private; 1707 struct ntfs_sb_info *sbi = fc->s_fs_info; 1708 1709 if (sbi) { 1710 ntfs3_put_sbi(sbi); 1711 ntfs3_free_sbi(sbi); 1712 } 1713 1714 if (opts) 1715 put_mount_options(opts); 1716} 1717 1718// clang-format off 1719static const struct fs_context_operations ntfs_context_ops = { 1720 .parse_param = ntfs_fs_parse_param, 1721 .get_tree = ntfs_fs_get_tree, 1722 .reconfigure = ntfs_fs_reconfigure, 1723 .free = ntfs_fs_free, 1724}; 1725// clang-format on 1726 1727/* 1728 * ntfs_init_fs_context - Initialize sbi and opts 1729 * 1730 * This will called when mount/remount. We will first initialize 1731 * options so that if remount we can use just that. 1732 */ 1733static int ntfs_init_fs_context(struct fs_context *fc) 1734{ 1735 struct ntfs_mount_options *opts; 1736 struct ntfs_sb_info *sbi; 1737 1738 opts = kzalloc(sizeof(struct ntfs_mount_options), GFP_NOFS); 1739 if (!opts) 1740 return -ENOMEM; 1741 1742 /* Default options. */ 1743 opts->fs_uid = current_uid(); 1744 opts->fs_gid = current_gid(); 1745 opts->fs_fmask_inv = ~current_umask(); 1746 opts->fs_dmask_inv = ~current_umask(); 1747 1748 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) 1749 goto ok; 1750 1751 sbi = kzalloc(sizeof(struct ntfs_sb_info), GFP_NOFS); 1752 if (!sbi) 1753 goto free_opts; 1754 1755 sbi->upcase = kvmalloc(0x10000 * sizeof(short), GFP_KERNEL); 1756 if (!sbi->upcase) 1757 goto free_sbi; 1758 1759 ratelimit_state_init(&sbi->msg_ratelimit, DEFAULT_RATELIMIT_INTERVAL, 1760 DEFAULT_RATELIMIT_BURST); 1761 1762 mutex_init(&sbi->compress.mtx_lznt); 1763#ifdef CONFIG_NTFS3_LZX_XPRESS 1764 mutex_init(&sbi->compress.mtx_xpress); 1765 mutex_init(&sbi->compress.mtx_lzx); 1766#endif 1767 1768 fc->s_fs_info = sbi; 1769ok: 1770 fc->fs_private = opts; 1771 fc->ops = &ntfs_context_ops; 1772 1773 return 0; 1774free_sbi: 1775 kfree(sbi); 1776free_opts: 1777 kfree(opts); 1778 return -ENOMEM; 1779} 1780 1781static void ntfs3_kill_sb(struct super_block *sb) 1782{ 1783 struct ntfs_sb_info *sbi = sb->s_fs_info; 1784 1785 kill_block_super(sb); 1786 1787 if (sbi->options) 1788 put_mount_options(sbi->options); 1789 ntfs3_free_sbi(sbi); 1790} 1791 1792// clang-format off 1793static struct file_system_type ntfs_fs_type = { 1794 .owner = THIS_MODULE, 1795 .name = "ntfs3", 1796 .init_fs_context = ntfs_init_fs_context, 1797 .parameters = ntfs_fs_parameters, 1798 .kill_sb = ntfs3_kill_sb, 1799 .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP, 1800}; 1801// clang-format on 1802 1803static int __init init_ntfs_fs(void) 1804{ 1805 int err; 1806 1807 pr_info("ntfs3: Max link count %u\n", NTFS_LINK_MAX); 1808 1809 if (IS_ENABLED(CONFIG_NTFS3_FS_POSIX_ACL)) 1810 pr_info("ntfs3: Enabled Linux POSIX ACLs support\n"); 1811 if (IS_ENABLED(CONFIG_NTFS3_64BIT_CLUSTER)) 1812 pr_notice( 1813 "ntfs3: Warning: Activated 64 bits per cluster. Windows does not support this\n"); 1814 if (IS_ENABLED(CONFIG_NTFS3_LZX_XPRESS)) 1815 pr_info("ntfs3: Read-only LZX/Xpress compression included\n"); 1816 1817#ifdef CONFIG_PROC_FS 1818 /* Create "/proc/fs/ntfs3" */ 1819 proc_info_root = proc_mkdir("fs/ntfs3", NULL); 1820#endif 1821 1822 err = ntfs3_init_bitmap(); 1823 if (err) 1824 return err; 1825 1826 ntfs_inode_cachep = kmem_cache_create( 1827 "ntfs_inode_cache", sizeof(struct ntfs_inode), 0, 1828 (SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD | SLAB_ACCOUNT), 1829 init_once); 1830 if (!ntfs_inode_cachep) { 1831 err = -ENOMEM; 1832 goto out1; 1833 } 1834 1835 err = register_filesystem(&ntfs_fs_type); 1836 if (err) 1837 goto out; 1838 1839 return 0; 1840out: 1841 kmem_cache_destroy(ntfs_inode_cachep); 1842out1: 1843 ntfs3_exit_bitmap(); 1844 return err; 1845} 1846 1847static void __exit exit_ntfs_fs(void) 1848{ 1849 rcu_barrier(); 1850 kmem_cache_destroy(ntfs_inode_cachep); 1851 unregister_filesystem(&ntfs_fs_type); 1852 ntfs3_exit_bitmap(); 1853 1854#ifdef CONFIG_PROC_FS 1855 if (proc_info_root) 1856 remove_proc_entry("fs/ntfs3", NULL); 1857#endif 1858} 1859 1860MODULE_LICENSE("GPL"); 1861MODULE_DESCRIPTION("ntfs3 read/write filesystem"); 1862#ifdef CONFIG_NTFS3_FS_POSIX_ACL 1863MODULE_INFO(behaviour, "Enabled Linux POSIX ACLs support"); 1864#endif 1865#ifdef CONFIG_NTFS3_64BIT_CLUSTER 1866MODULE_INFO( 1867 cluster, 1868 "Warning: Activated 64 bits per cluster. Windows does not support this"); 1869#endif 1870#ifdef CONFIG_NTFS3_LZX_XPRESS 1871MODULE_INFO(compression, "Read-only lzx/xpress compression included"); 1872#endif 1873 1874MODULE_AUTHOR("Konstantin Komarov"); 1875MODULE_ALIAS_FS("ntfs3"); 1876 1877module_init(init_ntfs_fs); 1878module_exit(exit_ntfs_fs); 1879