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 */ 25 26 #include <linux/blkdev.h> 27 #include <linux/buffer_head.h> 28 #include <linux/exportfs.h> 29 #include <linux/fs.h> 30 #include <linux/fs_context.h> 31 #include <linux/fs_parser.h> 32 #include <linux/log2.h> 33 #include <linux/minmax.h> 34 #include <linux/module.h> 35 #include <linux/nls.h> 36 #include <linux/seq_file.h> 37 #include <linux/statfs.h> 38 39 #include "debug.h" 40 #include "ntfs.h" 41 #include "ntfs_fs.h" 42 #ifdef CONFIG_NTFS3_LZX_XPRESS 43 #include "lib/lib.h" 44 #endif 45 46 #ifdef CONFIG_PRINTK 47 /* 48 * ntfs_printk - Trace warnings/notices/errors. 49 * 50 * Thanks Joe Perches <joe@perches.com> for implementation 51 */ 52 void ntfs_printk(const struct super_block *sb, const char *fmt, ...) 53 { 54 struct va_format vaf; 55 va_list args; 56 int level; 57 struct ntfs_sb_info *sbi = sb->s_fs_info; 58 59 /* Should we use different ratelimits for warnings/notices/errors? */ 60 if (!___ratelimit(&sbi->msg_ratelimit, "ntfs3")) 61 return; 62 63 va_start(args, fmt); 64 65 level = printk_get_level(fmt); 66 vaf.fmt = printk_skip_level(fmt); 67 vaf.va = &args; 68 printk("%c%cntfs3: %s: %pV\n", KERN_SOH_ASCII, level, sb->s_id, &vaf); 69 70 va_end(args); 71 } 72 73 static char s_name_buf[512]; 74 static atomic_t s_name_buf_cnt = ATOMIC_INIT(1); // 1 means 'free s_name_buf'. 75 76 /* 77 * ntfs_inode_printk 78 * 79 * Print warnings/notices/errors about inode using name or inode number. 80 */ 81 void ntfs_inode_printk(struct inode *inode, const char *fmt, ...) 82 { 83 struct super_block *sb = inode->i_sb; 84 struct ntfs_sb_info *sbi = sb->s_fs_info; 85 char *name; 86 va_list args; 87 struct va_format vaf; 88 int level; 89 90 if (!___ratelimit(&sbi->msg_ratelimit, "ntfs3")) 91 return; 92 93 /* Use static allocated buffer, if possible. */ 94 name = atomic_dec_and_test(&s_name_buf_cnt) 95 ? s_name_buf 96 : kmalloc(sizeof(s_name_buf), GFP_NOFS); 97 98 if (name) { 99 struct dentry *de = d_find_alias(inode); 100 const u32 name_len = ARRAY_SIZE(s_name_buf) - 1; 101 102 if (de) { 103 spin_lock(&de->d_lock); 104 snprintf(name, name_len, " \"%s\"", de->d_name.name); 105 spin_unlock(&de->d_lock); 106 name[name_len] = 0; /* To be sure. */ 107 } else { 108 name[0] = 0; 109 } 110 dput(de); /* Cocci warns if placed in branch "if (de)" */ 111 } 112 113 va_start(args, fmt); 114 115 level = printk_get_level(fmt); 116 vaf.fmt = printk_skip_level(fmt); 117 vaf.va = &args; 118 119 printk("%c%cntfs3: %s: ino=%lx,%s %pV\n", KERN_SOH_ASCII, level, 120 sb->s_id, inode->i_ino, name ? name : "", &vaf); 121 122 va_end(args); 123 124 atomic_inc(&s_name_buf_cnt); 125 if (name != s_name_buf) 126 kfree(name); 127 } 128 #endif 129 130 /* 131 * Shared memory struct. 132 * 133 * On-disk ntfs's upcase table is created by ntfs formatter. 134 * 'upcase' table is 128K bytes of memory. 135 * We should read it into memory when mounting. 136 * Several ntfs volumes likely use the same 'upcase' table. 137 * It is good idea to share in-memory 'upcase' table between different volumes. 138 * Unfortunately winxp/vista/win7 use different upcase tables. 139 */ 140 static DEFINE_SPINLOCK(s_shared_lock); 141 142 static struct { 143 void *ptr; 144 u32 len; 145 int cnt; 146 } s_shared[8]; 147 148 /* 149 * ntfs_set_shared 150 * 151 * Return: 152 * * @ptr - If pointer was saved in shared memory. 153 * * NULL - If pointer was not shared. 154 */ 155 void *ntfs_set_shared(void *ptr, u32 bytes) 156 { 157 void *ret = NULL; 158 int i, j = -1; 159 160 spin_lock(&s_shared_lock); 161 for (i = 0; i < ARRAY_SIZE(s_shared); i++) { 162 if (!s_shared[i].cnt) { 163 j = i; 164 } else if (bytes == s_shared[i].len && 165 !memcmp(s_shared[i].ptr, ptr, bytes)) { 166 s_shared[i].cnt += 1; 167 ret = s_shared[i].ptr; 168 break; 169 } 170 } 171 172 if (!ret && j != -1) { 173 s_shared[j].ptr = ptr; 174 s_shared[j].len = bytes; 175 s_shared[j].cnt = 1; 176 ret = ptr; 177 } 178 spin_unlock(&s_shared_lock); 179 180 return ret; 181 } 182 183 /* 184 * ntfs_put_shared 185 * 186 * Return: 187 * * @ptr - If pointer is not shared anymore. 188 * * NULL - If pointer is still shared. 189 */ 190 void *ntfs_put_shared(void *ptr) 191 { 192 void *ret = ptr; 193 int i; 194 195 spin_lock(&s_shared_lock); 196 for (i = 0; i < ARRAY_SIZE(s_shared); i++) { 197 if (s_shared[i].cnt && s_shared[i].ptr == ptr) { 198 if (--s_shared[i].cnt) 199 ret = NULL; 200 break; 201 } 202 } 203 spin_unlock(&s_shared_lock); 204 205 return ret; 206 } 207 208 static inline void put_mount_options(struct ntfs_mount_options *options) 209 { 210 kfree(options->nls_name); 211 unload_nls(options->nls); 212 kfree(options); 213 } 214 215 enum Opt { 216 Opt_uid, 217 Opt_gid, 218 Opt_umask, 219 Opt_dmask, 220 Opt_fmask, 221 Opt_immutable, 222 Opt_discard, 223 Opt_force, 224 Opt_sparse, 225 Opt_nohidden, 226 Opt_showmeta, 227 Opt_acl, 228 Opt_iocharset, 229 Opt_prealloc, 230 Opt_noacsrules, 231 Opt_err, 232 }; 233 234 static const struct fs_parameter_spec ntfs_fs_parameters[] = { 235 fsparam_u32("uid", Opt_uid), 236 fsparam_u32("gid", Opt_gid), 237 fsparam_u32oct("umask", Opt_umask), 238 fsparam_u32oct("dmask", Opt_dmask), 239 fsparam_u32oct("fmask", Opt_fmask), 240 fsparam_flag_no("sys_immutable", Opt_immutable), 241 fsparam_flag_no("discard", Opt_discard), 242 fsparam_flag_no("force", Opt_force), 243 fsparam_flag_no("sparse", Opt_sparse), 244 fsparam_flag_no("hidden", Opt_nohidden), 245 fsparam_flag_no("acl", Opt_acl), 246 fsparam_flag_no("showmeta", Opt_showmeta), 247 fsparam_flag_no("prealloc", Opt_prealloc), 248 fsparam_flag_no("acsrules", Opt_noacsrules), 249 fsparam_string("iocharset", Opt_iocharset), 250 {} 251 }; 252 253 /* 254 * Load nls table or if @nls is utf8 then return NULL. 255 */ 256 static struct nls_table *ntfs_load_nls(char *nls) 257 { 258 struct nls_table *ret; 259 260 if (!nls) 261 nls = CONFIG_NLS_DEFAULT; 262 263 if (strcmp(nls, "utf8") == 0) 264 return NULL; 265 266 if (strcmp(nls, CONFIG_NLS_DEFAULT) == 0) 267 return load_nls_default(); 268 269 ret = load_nls(nls); 270 if (ret) 271 return ret; 272 273 return ERR_PTR(-EINVAL); 274 } 275 276 static int ntfs_fs_parse_param(struct fs_context *fc, 277 struct fs_parameter *param) 278 { 279 struct ntfs_mount_options *opts = fc->fs_private; 280 struct fs_parse_result result; 281 int opt; 282 283 opt = fs_parse(fc, ntfs_fs_parameters, param, &result); 284 if (opt < 0) 285 return opt; 286 287 switch (opt) { 288 case Opt_uid: 289 opts->fs_uid = make_kuid(current_user_ns(), result.uint_32); 290 if (!uid_valid(opts->fs_uid)) 291 return invalf(fc, "ntfs3: Invalid value for uid."); 292 break; 293 case Opt_gid: 294 opts->fs_gid = make_kgid(current_user_ns(), result.uint_32); 295 if (!gid_valid(opts->fs_gid)) 296 return invalf(fc, "ntfs3: Invalid value for gid."); 297 break; 298 case Opt_umask: 299 if (result.uint_32 & ~07777) 300 return invalf(fc, "ntfs3: Invalid value for umask."); 301 opts->fs_fmask_inv = ~result.uint_32; 302 opts->fs_dmask_inv = ~result.uint_32; 303 opts->fmask = 1; 304 opts->dmask = 1; 305 break; 306 case Opt_dmask: 307 if (result.uint_32 & ~07777) 308 return invalf(fc, "ntfs3: Invalid value for dmask."); 309 opts->fs_dmask_inv = ~result.uint_32; 310 opts->dmask = 1; 311 break; 312 case Opt_fmask: 313 if (result.uint_32 & ~07777) 314 return invalf(fc, "ntfs3: Invalid value for fmask."); 315 opts->fs_fmask_inv = ~result.uint_32; 316 opts->fmask = 1; 317 break; 318 case Opt_immutable: 319 opts->sys_immutable = result.negated ? 0 : 1; 320 break; 321 case Opt_discard: 322 opts->discard = result.negated ? 0 : 1; 323 break; 324 case Opt_force: 325 opts->force = result.negated ? 0 : 1; 326 break; 327 case Opt_sparse: 328 opts->sparse = result.negated ? 0 : 1; 329 break; 330 case Opt_nohidden: 331 opts->nohidden = result.negated ? 1 : 0; 332 break; 333 case Opt_acl: 334 if (!result.negated) 335 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 336 fc->sb_flags |= SB_POSIXACL; 337 #else 338 return invalf(fc, "ntfs3: Support for ACL not compiled in!"); 339 #endif 340 else 341 fc->sb_flags &= ~SB_POSIXACL; 342 break; 343 case Opt_showmeta: 344 opts->showmeta = result.negated ? 0 : 1; 345 break; 346 case Opt_iocharset: 347 kfree(opts->nls_name); 348 opts->nls_name = param->string; 349 param->string = NULL; 350 break; 351 case Opt_prealloc: 352 opts->prealloc = result.negated ? 0 : 1; 353 break; 354 case Opt_noacsrules: 355 opts->noacsrules = result.negated ? 1 : 0; 356 break; 357 default: 358 /* Should not be here unless we forget add case. */ 359 return -EINVAL; 360 } 361 return 0; 362 } 363 364 static int ntfs_fs_reconfigure(struct fs_context *fc) 365 { 366 struct super_block *sb = fc->root->d_sb; 367 struct ntfs_sb_info *sbi = sb->s_fs_info; 368 struct ntfs_mount_options *new_opts = fc->fs_private; 369 int ro_rw; 370 371 ro_rw = sb_rdonly(sb) && !(fc->sb_flags & SB_RDONLY); 372 if (ro_rw && (sbi->flags & NTFS_FLAGS_NEED_REPLAY)) { 373 errorf(fc, "ntfs3: Couldn't remount rw because journal is not replayed. Please umount/remount instead\n"); 374 return -EINVAL; 375 } 376 377 new_opts->nls = ntfs_load_nls(new_opts->nls_name); 378 if (IS_ERR(new_opts->nls)) { 379 new_opts->nls = NULL; 380 errorf(fc, "ntfs3: Cannot load iocharset %s", new_opts->nls_name); 381 return -EINVAL; 382 } 383 if (new_opts->nls != sbi->options->nls) 384 return invalf(fc, "ntfs3: Cannot use different iocharset when remounting!"); 385 386 sync_filesystem(sb); 387 388 if (ro_rw && (sbi->volume.flags & VOLUME_FLAG_DIRTY) && 389 !new_opts->force) { 390 errorf(fc, "ntfs3: Volume is dirty and \"force\" flag is not set!"); 391 return -EINVAL; 392 } 393 394 swap(sbi->options, fc->fs_private); 395 396 return 0; 397 } 398 399 static struct kmem_cache *ntfs_inode_cachep; 400 401 static struct inode *ntfs_alloc_inode(struct super_block *sb) 402 { 403 struct ntfs_inode *ni = alloc_inode_sb(sb, ntfs_inode_cachep, GFP_NOFS); 404 405 if (!ni) 406 return NULL; 407 408 memset(ni, 0, offsetof(struct ntfs_inode, vfs_inode)); 409 410 mutex_init(&ni->ni_lock); 411 412 return &ni->vfs_inode; 413 } 414 415 static void ntfs_i_callback(struct rcu_head *head) 416 { 417 struct inode *inode = container_of(head, struct inode, i_rcu); 418 struct ntfs_inode *ni = ntfs_i(inode); 419 420 mutex_destroy(&ni->ni_lock); 421 422 kmem_cache_free(ntfs_inode_cachep, ni); 423 } 424 425 static void ntfs_destroy_inode(struct inode *inode) 426 { 427 call_rcu(&inode->i_rcu, ntfs_i_callback); 428 } 429 430 static void init_once(void *foo) 431 { 432 struct ntfs_inode *ni = foo; 433 434 inode_init_once(&ni->vfs_inode); 435 } 436 437 /* 438 * put_ntfs - Noinline to reduce binary size. 439 */ 440 static noinline void put_ntfs(struct ntfs_sb_info *sbi) 441 { 442 kfree(sbi->new_rec); 443 kvfree(ntfs_put_shared(sbi->upcase)); 444 kfree(sbi->def_table); 445 446 wnd_close(&sbi->mft.bitmap); 447 wnd_close(&sbi->used.bitmap); 448 449 if (sbi->mft.ni) 450 iput(&sbi->mft.ni->vfs_inode); 451 452 if (sbi->security.ni) 453 iput(&sbi->security.ni->vfs_inode); 454 455 if (sbi->reparse.ni) 456 iput(&sbi->reparse.ni->vfs_inode); 457 458 if (sbi->objid.ni) 459 iput(&sbi->objid.ni->vfs_inode); 460 461 if (sbi->volume.ni) 462 iput(&sbi->volume.ni->vfs_inode); 463 464 ntfs_update_mftmirr(sbi, 0); 465 466 indx_clear(&sbi->security.index_sii); 467 indx_clear(&sbi->security.index_sdh); 468 indx_clear(&sbi->reparse.index_r); 469 indx_clear(&sbi->objid.index_o); 470 kfree(sbi->compress.lznt); 471 #ifdef CONFIG_NTFS3_LZX_XPRESS 472 xpress_free_decompressor(sbi->compress.xpress); 473 lzx_free_decompressor(sbi->compress.lzx); 474 #endif 475 kfree(sbi); 476 } 477 478 static void ntfs_put_super(struct super_block *sb) 479 { 480 struct ntfs_sb_info *sbi = sb->s_fs_info; 481 482 /* Mark rw ntfs as clear, if possible. */ 483 ntfs_set_state(sbi, NTFS_DIRTY_CLEAR); 484 485 put_mount_options(sbi->options); 486 put_ntfs(sbi); 487 sb->s_fs_info = NULL; 488 489 sync_blockdev(sb->s_bdev); 490 } 491 492 static int ntfs_statfs(struct dentry *dentry, struct kstatfs *buf) 493 { 494 struct super_block *sb = dentry->d_sb; 495 struct ntfs_sb_info *sbi = sb->s_fs_info; 496 struct wnd_bitmap *wnd = &sbi->used.bitmap; 497 498 buf->f_type = sb->s_magic; 499 buf->f_bsize = sbi->cluster_size; 500 buf->f_blocks = wnd->nbits; 501 502 buf->f_bfree = buf->f_bavail = wnd_zeroes(wnd); 503 buf->f_fsid.val[0] = sbi->volume.ser_num; 504 buf->f_fsid.val[1] = (sbi->volume.ser_num >> 32); 505 buf->f_namelen = NTFS_NAME_LEN; 506 507 return 0; 508 } 509 510 static int ntfs_show_options(struct seq_file *m, struct dentry *root) 511 { 512 struct super_block *sb = root->d_sb; 513 struct ntfs_sb_info *sbi = sb->s_fs_info; 514 struct ntfs_mount_options *opts = sbi->options; 515 struct user_namespace *user_ns = seq_user_ns(m); 516 517 seq_printf(m, ",uid=%u", 518 from_kuid_munged(user_ns, opts->fs_uid)); 519 seq_printf(m, ",gid=%u", 520 from_kgid_munged(user_ns, opts->fs_gid)); 521 if (opts->fmask) 522 seq_printf(m, ",fmask=%04o", ~opts->fs_fmask_inv); 523 if (opts->dmask) 524 seq_printf(m, ",dmask=%04o", ~opts->fs_dmask_inv); 525 if (opts->nls) 526 seq_printf(m, ",iocharset=%s", opts->nls->charset); 527 else 528 seq_puts(m, ",iocharset=utf8"); 529 if (opts->sys_immutable) 530 seq_puts(m, ",sys_immutable"); 531 if (opts->discard) 532 seq_puts(m, ",discard"); 533 if (opts->sparse) 534 seq_puts(m, ",sparse"); 535 if (opts->showmeta) 536 seq_puts(m, ",showmeta"); 537 if (opts->nohidden) 538 seq_puts(m, ",nohidden"); 539 if (opts->force) 540 seq_puts(m, ",force"); 541 if (opts->noacsrules) 542 seq_puts(m, ",noacsrules"); 543 if (opts->prealloc) 544 seq_puts(m, ",prealloc"); 545 if (sb->s_flags & SB_POSIXACL) 546 seq_puts(m, ",acl"); 547 548 return 0; 549 } 550 551 /* 552 * ntfs_sync_fs - super_operations::sync_fs 553 */ 554 static int ntfs_sync_fs(struct super_block *sb, int wait) 555 { 556 int err = 0, err2; 557 struct ntfs_sb_info *sbi = sb->s_fs_info; 558 struct ntfs_inode *ni; 559 struct inode *inode; 560 561 ni = sbi->security.ni; 562 if (ni) { 563 inode = &ni->vfs_inode; 564 err2 = _ni_write_inode(inode, wait); 565 if (err2 && !err) 566 err = err2; 567 } 568 569 ni = sbi->objid.ni; 570 if (ni) { 571 inode = &ni->vfs_inode; 572 err2 = _ni_write_inode(inode, wait); 573 if (err2 && !err) 574 err = err2; 575 } 576 577 ni = sbi->reparse.ni; 578 if (ni) { 579 inode = &ni->vfs_inode; 580 err2 = _ni_write_inode(inode, wait); 581 if (err2 && !err) 582 err = err2; 583 } 584 585 if (!err) 586 ntfs_set_state(sbi, NTFS_DIRTY_CLEAR); 587 588 ntfs_update_mftmirr(sbi, wait); 589 590 return err; 591 } 592 593 static const struct super_operations ntfs_sops = { 594 .alloc_inode = ntfs_alloc_inode, 595 .destroy_inode = ntfs_destroy_inode, 596 .evict_inode = ntfs_evict_inode, 597 .put_super = ntfs_put_super, 598 .statfs = ntfs_statfs, 599 .show_options = ntfs_show_options, 600 .sync_fs = ntfs_sync_fs, 601 .write_inode = ntfs3_write_inode, 602 }; 603 604 static struct inode *ntfs_export_get_inode(struct super_block *sb, u64 ino, 605 u32 generation) 606 { 607 struct MFT_REF ref; 608 struct inode *inode; 609 610 ref.low = cpu_to_le32(ino); 611 #ifdef CONFIG_NTFS3_64BIT_CLUSTER 612 ref.high = cpu_to_le16(ino >> 32); 613 #else 614 ref.high = 0; 615 #endif 616 ref.seq = cpu_to_le16(generation); 617 618 inode = ntfs_iget5(sb, &ref, NULL); 619 if (!IS_ERR(inode) && is_bad_inode(inode)) { 620 iput(inode); 621 inode = ERR_PTR(-ESTALE); 622 } 623 624 return inode; 625 } 626 627 static struct dentry *ntfs_fh_to_dentry(struct super_block *sb, struct fid *fid, 628 int fh_len, int fh_type) 629 { 630 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 631 ntfs_export_get_inode); 632 } 633 634 static struct dentry *ntfs_fh_to_parent(struct super_block *sb, struct fid *fid, 635 int fh_len, int fh_type) 636 { 637 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 638 ntfs_export_get_inode); 639 } 640 641 /* TODO: == ntfs_sync_inode */ 642 static int ntfs_nfs_commit_metadata(struct inode *inode) 643 { 644 return _ni_write_inode(inode, 1); 645 } 646 647 static const struct export_operations ntfs_export_ops = { 648 .fh_to_dentry = ntfs_fh_to_dentry, 649 .fh_to_parent = ntfs_fh_to_parent, 650 .get_parent = ntfs3_get_parent, 651 .commit_metadata = ntfs_nfs_commit_metadata, 652 }; 653 654 /* 655 * format_size_gb - Return Gb,Mb to print with "%u.%02u Gb". 656 */ 657 static u32 format_size_gb(const u64 bytes, u32 *mb) 658 { 659 /* Do simple right 30 bit shift of 64 bit value. */ 660 u64 kbytes = bytes >> 10; 661 u32 kbytes32 = kbytes; 662 663 *mb = (100 * (kbytes32 & 0xfffff) + 0x7ffff) >> 20; 664 if (*mb >= 100) 665 *mb = 99; 666 667 return (kbytes32 >> 20) | (((u32)(kbytes >> 32)) << 12); 668 } 669 670 static u32 true_sectors_per_clst(const struct NTFS_BOOT *boot) 671 { 672 if (boot->sectors_per_clusters <= 0x80) 673 return boot->sectors_per_clusters; 674 if (boot->sectors_per_clusters >= 0xf4) /* limit shift to 2MB max */ 675 return 1U << (0 - boot->sectors_per_clusters); 676 return -EINVAL; 677 } 678 679 /* 680 * ntfs_init_from_boot - Init internal info from on-disk boot sector. 681 */ 682 static int ntfs_init_from_boot(struct super_block *sb, u32 sector_size, 683 u64 dev_size) 684 { 685 struct ntfs_sb_info *sbi = sb->s_fs_info; 686 int err; 687 u32 mb, gb, boot_sector_size, sct_per_clst, record_size; 688 u64 sectors, clusters, mlcn, mlcn2; 689 struct NTFS_BOOT *boot; 690 struct buffer_head *bh; 691 struct MFT_REC *rec; 692 u16 fn, ao; 693 694 sbi->volume.blocks = dev_size >> PAGE_SHIFT; 695 696 bh = ntfs_bread(sb, 0); 697 if (!bh) 698 return -EIO; 699 700 err = -EINVAL; 701 boot = (struct NTFS_BOOT *)bh->b_data; 702 703 if (memcmp(boot->system_id, "NTFS ", sizeof("NTFS ") - 1)) 704 goto out; 705 706 /* 0x55AA is not mandaroty. Thanks Maxim Suhanov*/ 707 /*if (0x55 != boot->boot_magic[0] || 0xAA != boot->boot_magic[1]) 708 * goto out; 709 */ 710 711 boot_sector_size = (u32)boot->bytes_per_sector[1] << 8; 712 if (boot->bytes_per_sector[0] || boot_sector_size < SECTOR_SIZE || 713 !is_power_of_2(boot_sector_size)) { 714 goto out; 715 } 716 717 /* cluster size: 512, 1K, 2K, 4K, ... 2M */ 718 sct_per_clst = true_sectors_per_clst(boot); 719 if ((int)sct_per_clst < 0) 720 goto out; 721 if (!is_power_of_2(sct_per_clst)) 722 goto out; 723 724 mlcn = le64_to_cpu(boot->mft_clst); 725 mlcn2 = le64_to_cpu(boot->mft2_clst); 726 sectors = le64_to_cpu(boot->sectors_per_volume); 727 728 if (mlcn * sct_per_clst >= sectors) 729 goto out; 730 731 if (mlcn2 * sct_per_clst >= sectors) 732 goto out; 733 734 /* Check MFT record size. */ 735 if ((boot->record_size < 0 && 736 SECTOR_SIZE > (2U << (-boot->record_size))) || 737 (boot->record_size >= 0 && !is_power_of_2(boot->record_size))) { 738 goto out; 739 } 740 741 /* Check index record size. */ 742 if ((boot->index_size < 0 && 743 SECTOR_SIZE > (2U << (-boot->index_size))) || 744 (boot->index_size >= 0 && !is_power_of_2(boot->index_size))) { 745 goto out; 746 } 747 748 sbi->volume.size = sectors * boot_sector_size; 749 750 gb = format_size_gb(sbi->volume.size + boot_sector_size, &mb); 751 752 /* 753 * - Volume formatted and mounted with the same sector size. 754 * - Volume formatted 4K and mounted as 512. 755 * - Volume formatted 512 and mounted as 4K. 756 */ 757 if (boot_sector_size != sector_size) { 758 ntfs_warn( 759 sb, 760 "Different NTFS' sector size (%u) and media sector size (%u)", 761 boot_sector_size, sector_size); 762 dev_size += sector_size - 1; 763 } 764 765 sbi->cluster_size = boot_sector_size * sct_per_clst; 766 sbi->cluster_bits = blksize_bits(sbi->cluster_size); 767 768 sbi->mft.lbo = mlcn << sbi->cluster_bits; 769 sbi->mft.lbo2 = mlcn2 << sbi->cluster_bits; 770 771 /* Compare boot's cluster and sector. */ 772 if (sbi->cluster_size < boot_sector_size) 773 goto out; 774 775 /* Compare boot's cluster and media sector. */ 776 if (sbi->cluster_size < sector_size) { 777 /* No way to use ntfs_get_block in this case. */ 778 ntfs_err( 779 sb, 780 "Failed to mount 'cause NTFS's cluster size (%u) is less than media sector size (%u)", 781 sbi->cluster_size, sector_size); 782 goto out; 783 } 784 785 sbi->cluster_mask = sbi->cluster_size - 1; 786 sbi->cluster_mask_inv = ~(u64)sbi->cluster_mask; 787 sbi->record_size = record_size = boot->record_size < 0 788 ? 1 << (-boot->record_size) 789 : (u32)boot->record_size 790 << sbi->cluster_bits; 791 792 if (record_size > MAXIMUM_BYTES_PER_MFT) 793 goto out; 794 795 sbi->record_bits = blksize_bits(record_size); 796 sbi->attr_size_tr = (5 * record_size >> 4); // ~320 bytes 797 798 sbi->max_bytes_per_attr = 799 record_size - ALIGN(MFTRECORD_FIXUP_OFFSET_1, 8) - 800 ALIGN(((record_size >> SECTOR_SHIFT) * sizeof(short)), 8) - 801 ALIGN(sizeof(enum ATTR_TYPE), 8); 802 803 sbi->index_size = boot->index_size < 0 804 ? 1u << (-boot->index_size) 805 : (u32)boot->index_size << sbi->cluster_bits; 806 807 sbi->volume.ser_num = le64_to_cpu(boot->serial_num); 808 809 /* Warning if RAW volume. */ 810 if (dev_size < sbi->volume.size + boot_sector_size) { 811 u32 mb0, gb0; 812 813 gb0 = format_size_gb(dev_size, &mb0); 814 ntfs_warn( 815 sb, 816 "RAW NTFS volume: Filesystem size %u.%02u Gb > volume size %u.%02u Gb. Mount in read-only", 817 gb, mb, gb0, mb0); 818 sb->s_flags |= SB_RDONLY; 819 } 820 821 clusters = sbi->volume.size >> sbi->cluster_bits; 822 #ifndef CONFIG_NTFS3_64BIT_CLUSTER 823 /* 32 bits per cluster. */ 824 if (clusters >> 32) { 825 ntfs_notice( 826 sb, 827 "NTFS %u.%02u Gb is too big to use 32 bits per cluster", 828 gb, mb); 829 goto out; 830 } 831 #elif BITS_PER_LONG < 64 832 #error "CONFIG_NTFS3_64BIT_CLUSTER incompatible in 32 bit OS" 833 #endif 834 835 sbi->used.bitmap.nbits = clusters; 836 837 rec = kzalloc(record_size, GFP_NOFS); 838 if (!rec) { 839 err = -ENOMEM; 840 goto out; 841 } 842 843 sbi->new_rec = rec; 844 rec->rhdr.sign = NTFS_FILE_SIGNATURE; 845 rec->rhdr.fix_off = cpu_to_le16(MFTRECORD_FIXUP_OFFSET_1); 846 fn = (sbi->record_size >> SECTOR_SHIFT) + 1; 847 rec->rhdr.fix_num = cpu_to_le16(fn); 848 ao = ALIGN(MFTRECORD_FIXUP_OFFSET_1 + sizeof(short) * fn, 8); 849 rec->attr_off = cpu_to_le16(ao); 850 rec->used = cpu_to_le32(ao + ALIGN(sizeof(enum ATTR_TYPE), 8)); 851 rec->total = cpu_to_le32(sbi->record_size); 852 ((struct ATTRIB *)Add2Ptr(rec, ao))->type = ATTR_END; 853 854 sb_set_blocksize(sb, min_t(u32, sbi->cluster_size, PAGE_SIZE)); 855 856 sbi->block_mask = sb->s_blocksize - 1; 857 sbi->blocks_per_cluster = sbi->cluster_size >> sb->s_blocksize_bits; 858 sbi->volume.blocks = sbi->volume.size >> sb->s_blocksize_bits; 859 860 /* Maximum size for normal files. */ 861 sbi->maxbytes = (clusters << sbi->cluster_bits) - 1; 862 863 #ifdef CONFIG_NTFS3_64BIT_CLUSTER 864 if (clusters >= (1ull << (64 - sbi->cluster_bits))) 865 sbi->maxbytes = -1; 866 sbi->maxbytes_sparse = -1; 867 sb->s_maxbytes = MAX_LFS_FILESIZE; 868 #else 869 /* Maximum size for sparse file. */ 870 sbi->maxbytes_sparse = (1ull << (sbi->cluster_bits + 32)) - 1; 871 sb->s_maxbytes = 0xFFFFFFFFull << sbi->cluster_bits; 872 #endif 873 874 /* 875 * Compute the MFT zone at two steps. 876 * It would be nice if we are able to allocate 1/8 of 877 * total clusters for MFT but not more then 512 MB. 878 */ 879 sbi->zone_max = min_t(CLST, 0x20000000 >> sbi->cluster_bits, clusters >> 3); 880 881 err = 0; 882 883 out: 884 brelse(bh); 885 886 return err; 887 } 888 889 /* 890 * ntfs_fill_super - Try to mount. 891 */ 892 static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc) 893 { 894 int err; 895 struct ntfs_sb_info *sbi = sb->s_fs_info; 896 struct block_device *bdev = sb->s_bdev; 897 struct inode *inode; 898 struct ntfs_inode *ni; 899 size_t i, tt; 900 CLST vcn, lcn, len; 901 struct ATTRIB *attr; 902 const struct VOLUME_INFO *info; 903 u32 idx, done, bytes; 904 struct ATTR_DEF_ENTRY *t; 905 u16 *shared; 906 struct MFT_REF ref; 907 908 ref.high = 0; 909 910 sbi->sb = sb; 911 sbi->options = fc->fs_private; 912 fc->fs_private = NULL; 913 sb->s_flags |= SB_NODIRATIME; 914 sb->s_magic = 0x7366746e; // "ntfs" 915 sb->s_op = &ntfs_sops; 916 sb->s_export_op = &ntfs_export_ops; 917 sb->s_time_gran = NTFS_TIME_GRAN; // 100 nsec 918 sb->s_xattr = ntfs_xattr_handlers; 919 920 sbi->options->nls = ntfs_load_nls(sbi->options->nls_name); 921 if (IS_ERR(sbi->options->nls)) { 922 sbi->options->nls = NULL; 923 errorf(fc, "Cannot load nls %s", sbi->options->nls_name); 924 err = -EINVAL; 925 goto out; 926 } 927 928 if (bdev_max_discard_sectors(bdev) && bdev_discard_granularity(bdev)) { 929 sbi->discard_granularity = bdev_discard_granularity(bdev); 930 sbi->discard_granularity_mask_inv = 931 ~(u64)(sbi->discard_granularity - 1); 932 } 933 934 /* Parse boot. */ 935 err = ntfs_init_from_boot(sb, bdev_logical_block_size(bdev), 936 bdev_nr_bytes(bdev)); 937 if (err) 938 goto out; 939 940 /* 941 * Load $Volume. This should be done before $LogFile 942 * 'cause 'sbi->volume.ni' is used 'ntfs_set_state'. 943 */ 944 ref.low = cpu_to_le32(MFT_REC_VOL); 945 ref.seq = cpu_to_le16(MFT_REC_VOL); 946 inode = ntfs_iget5(sb, &ref, &NAME_VOLUME); 947 if (IS_ERR(inode)) { 948 ntfs_err(sb, "Failed to load $Volume."); 949 err = PTR_ERR(inode); 950 goto out; 951 } 952 953 ni = ntfs_i(inode); 954 955 /* Load and save label (not necessary). */ 956 attr = ni_find_attr(ni, NULL, NULL, ATTR_LABEL, NULL, 0, NULL, NULL); 957 958 if (!attr) { 959 /* It is ok if no ATTR_LABEL */ 960 } else if (!attr->non_res && !is_attr_ext(attr)) { 961 /* $AttrDef allows labels to be up to 128 symbols. */ 962 err = utf16s_to_utf8s(resident_data(attr), 963 le32_to_cpu(attr->res.data_size) >> 1, 964 UTF16_LITTLE_ENDIAN, sbi->volume.label, 965 sizeof(sbi->volume.label)); 966 if (err < 0) 967 sbi->volume.label[0] = 0; 968 } else { 969 /* Should we break mounting here? */ 970 //err = -EINVAL; 971 //goto put_inode_out; 972 } 973 974 attr = ni_find_attr(ni, attr, NULL, ATTR_VOL_INFO, NULL, 0, NULL, NULL); 975 if (!attr || is_attr_ext(attr)) { 976 err = -EINVAL; 977 goto put_inode_out; 978 } 979 980 info = resident_data_ex(attr, SIZEOF_ATTRIBUTE_VOLUME_INFO); 981 if (!info) { 982 err = -EINVAL; 983 goto put_inode_out; 984 } 985 986 sbi->volume.major_ver = info->major_ver; 987 sbi->volume.minor_ver = info->minor_ver; 988 sbi->volume.flags = info->flags; 989 sbi->volume.ni = ni; 990 991 /* Load $MFTMirr to estimate recs_mirr. */ 992 ref.low = cpu_to_le32(MFT_REC_MIRR); 993 ref.seq = cpu_to_le16(MFT_REC_MIRR); 994 inode = ntfs_iget5(sb, &ref, &NAME_MIRROR); 995 if (IS_ERR(inode)) { 996 ntfs_err(sb, "Failed to load $MFTMirr."); 997 err = PTR_ERR(inode); 998 goto out; 999 } 1000 1001 sbi->mft.recs_mirr = 1002 ntfs_up_cluster(sbi, inode->i_size) >> sbi->record_bits; 1003 1004 iput(inode); 1005 1006 /* Load LogFile to replay. */ 1007 ref.low = cpu_to_le32(MFT_REC_LOG); 1008 ref.seq = cpu_to_le16(MFT_REC_LOG); 1009 inode = ntfs_iget5(sb, &ref, &NAME_LOGFILE); 1010 if (IS_ERR(inode)) { 1011 ntfs_err(sb, "Failed to load \x24LogFile."); 1012 err = PTR_ERR(inode); 1013 goto out; 1014 } 1015 1016 ni = ntfs_i(inode); 1017 1018 err = ntfs_loadlog_and_replay(ni, sbi); 1019 if (err) 1020 goto put_inode_out; 1021 1022 iput(inode); 1023 1024 if (sbi->flags & NTFS_FLAGS_NEED_REPLAY) { 1025 if (!sb_rdonly(sb)) { 1026 ntfs_warn(sb, 1027 "failed to replay log file. Can't mount rw!"); 1028 err = -EINVAL; 1029 goto out; 1030 } 1031 } else if (sbi->volume.flags & VOLUME_FLAG_DIRTY) { 1032 if (!sb_rdonly(sb) && !sbi->options->force) { 1033 ntfs_warn( 1034 sb, 1035 "volume is dirty and \"force\" flag is not set!"); 1036 err = -EINVAL; 1037 goto out; 1038 } 1039 } 1040 1041 /* Load $MFT. */ 1042 ref.low = cpu_to_le32(MFT_REC_MFT); 1043 ref.seq = cpu_to_le16(1); 1044 1045 inode = ntfs_iget5(sb, &ref, &NAME_MFT); 1046 if (IS_ERR(inode)) { 1047 ntfs_err(sb, "Failed to load $MFT."); 1048 err = PTR_ERR(inode); 1049 goto out; 1050 } 1051 1052 ni = ntfs_i(inode); 1053 1054 sbi->mft.used = ni->i_valid >> sbi->record_bits; 1055 tt = inode->i_size >> sbi->record_bits; 1056 sbi->mft.next_free = MFT_REC_USER; 1057 1058 err = wnd_init(&sbi->mft.bitmap, sb, tt); 1059 if (err) 1060 goto put_inode_out; 1061 1062 err = ni_load_all_mi(ni); 1063 if (err) 1064 goto put_inode_out; 1065 1066 sbi->mft.ni = ni; 1067 1068 /* Load $BadClus. */ 1069 ref.low = cpu_to_le32(MFT_REC_BADCLUST); 1070 ref.seq = cpu_to_le16(MFT_REC_BADCLUST); 1071 inode = ntfs_iget5(sb, &ref, &NAME_BADCLUS); 1072 if (IS_ERR(inode)) { 1073 ntfs_err(sb, "Failed to load $BadClus."); 1074 err = PTR_ERR(inode); 1075 goto out; 1076 } 1077 1078 ni = ntfs_i(inode); 1079 1080 for (i = 0; run_get_entry(&ni->file.run, i, &vcn, &lcn, &len); i++) { 1081 if (lcn == SPARSE_LCN) 1082 continue; 1083 1084 if (!sbi->bad_clusters) 1085 ntfs_notice(sb, "Volume contains bad blocks"); 1086 1087 sbi->bad_clusters += len; 1088 } 1089 1090 iput(inode); 1091 1092 /* Load $Bitmap. */ 1093 ref.low = cpu_to_le32(MFT_REC_BITMAP); 1094 ref.seq = cpu_to_le16(MFT_REC_BITMAP); 1095 inode = ntfs_iget5(sb, &ref, &NAME_BITMAP); 1096 if (IS_ERR(inode)) { 1097 ntfs_err(sb, "Failed to load $Bitmap."); 1098 err = PTR_ERR(inode); 1099 goto out; 1100 } 1101 1102 #ifndef CONFIG_NTFS3_64BIT_CLUSTER 1103 if (inode->i_size >> 32) { 1104 err = -EINVAL; 1105 goto put_inode_out; 1106 } 1107 #endif 1108 1109 /* Check bitmap boundary. */ 1110 tt = sbi->used.bitmap.nbits; 1111 if (inode->i_size < bitmap_size(tt)) { 1112 err = -EINVAL; 1113 goto put_inode_out; 1114 } 1115 1116 /* Not necessary. */ 1117 sbi->used.bitmap.set_tail = true; 1118 err = wnd_init(&sbi->used.bitmap, sb, tt); 1119 if (err) 1120 goto put_inode_out; 1121 1122 iput(inode); 1123 1124 /* Compute the MFT zone. */ 1125 err = ntfs_refresh_zone(sbi); 1126 if (err) 1127 goto out; 1128 1129 /* Load $AttrDef. */ 1130 ref.low = cpu_to_le32(MFT_REC_ATTR); 1131 ref.seq = cpu_to_le16(MFT_REC_ATTR); 1132 inode = ntfs_iget5(sb, &ref, &NAME_ATTRDEF); 1133 if (IS_ERR(inode)) { 1134 ntfs_err(sb, "Failed to load $AttrDef -> %d", err); 1135 err = PTR_ERR(inode); 1136 goto out; 1137 } 1138 1139 if (inode->i_size < sizeof(struct ATTR_DEF_ENTRY)) { 1140 err = -EINVAL; 1141 goto put_inode_out; 1142 } 1143 bytes = inode->i_size; 1144 sbi->def_table = t = kmalloc(bytes, GFP_NOFS); 1145 if (!t) { 1146 err = -ENOMEM; 1147 goto put_inode_out; 1148 } 1149 1150 for (done = idx = 0; done < bytes; done += PAGE_SIZE, idx++) { 1151 unsigned long tail = bytes - done; 1152 struct page *page = ntfs_map_page(inode->i_mapping, idx); 1153 1154 if (IS_ERR(page)) { 1155 err = PTR_ERR(page); 1156 goto put_inode_out; 1157 } 1158 memcpy(Add2Ptr(t, done), page_address(page), 1159 min(PAGE_SIZE, tail)); 1160 ntfs_unmap_page(page); 1161 1162 if (!idx && ATTR_STD != t->type) { 1163 err = -EINVAL; 1164 goto put_inode_out; 1165 } 1166 } 1167 1168 t += 1; 1169 sbi->def_entries = 1; 1170 done = sizeof(struct ATTR_DEF_ENTRY); 1171 sbi->reparse.max_size = MAXIMUM_REPARSE_DATA_BUFFER_SIZE; 1172 sbi->ea_max_size = 0x10000; /* default formatter value */ 1173 1174 while (done + sizeof(struct ATTR_DEF_ENTRY) <= bytes) { 1175 u32 t32 = le32_to_cpu(t->type); 1176 u64 sz = le64_to_cpu(t->max_sz); 1177 1178 if ((t32 & 0xF) || le32_to_cpu(t[-1].type) >= t32) 1179 break; 1180 1181 if (t->type == ATTR_REPARSE) 1182 sbi->reparse.max_size = sz; 1183 else if (t->type == ATTR_EA) 1184 sbi->ea_max_size = sz; 1185 1186 done += sizeof(struct ATTR_DEF_ENTRY); 1187 t += 1; 1188 sbi->def_entries += 1; 1189 } 1190 iput(inode); 1191 1192 /* Load $UpCase. */ 1193 ref.low = cpu_to_le32(MFT_REC_UPCASE); 1194 ref.seq = cpu_to_le16(MFT_REC_UPCASE); 1195 inode = ntfs_iget5(sb, &ref, &NAME_UPCASE); 1196 if (IS_ERR(inode)) { 1197 ntfs_err(sb, "Failed to load $UpCase."); 1198 err = PTR_ERR(inode); 1199 goto out; 1200 } 1201 1202 if (inode->i_size != 0x10000 * sizeof(short)) { 1203 err = -EINVAL; 1204 goto put_inode_out; 1205 } 1206 1207 for (idx = 0; idx < (0x10000 * sizeof(short) >> PAGE_SHIFT); idx++) { 1208 const __le16 *src; 1209 u16 *dst = Add2Ptr(sbi->upcase, idx << PAGE_SHIFT); 1210 struct page *page = ntfs_map_page(inode->i_mapping, idx); 1211 1212 if (IS_ERR(page)) { 1213 err = PTR_ERR(page); 1214 goto put_inode_out; 1215 } 1216 1217 src = page_address(page); 1218 1219 #ifdef __BIG_ENDIAN 1220 for (i = 0; i < PAGE_SIZE / sizeof(u16); i++) 1221 *dst++ = le16_to_cpu(*src++); 1222 #else 1223 memcpy(dst, src, PAGE_SIZE); 1224 #endif 1225 ntfs_unmap_page(page); 1226 } 1227 1228 shared = ntfs_set_shared(sbi->upcase, 0x10000 * sizeof(short)); 1229 if (shared && sbi->upcase != shared) { 1230 kvfree(sbi->upcase); 1231 sbi->upcase = shared; 1232 } 1233 1234 iput(inode); 1235 1236 if (is_ntfs3(sbi)) { 1237 /* Load $Secure. */ 1238 err = ntfs_security_init(sbi); 1239 if (err) 1240 goto out; 1241 1242 /* Load $Extend. */ 1243 err = ntfs_extend_init(sbi); 1244 if (err) 1245 goto load_root; 1246 1247 /* Load $Extend\$Reparse. */ 1248 err = ntfs_reparse_init(sbi); 1249 if (err) 1250 goto load_root; 1251 1252 /* Load $Extend\$ObjId. */ 1253 err = ntfs_objid_init(sbi); 1254 if (err) 1255 goto load_root; 1256 } 1257 1258 load_root: 1259 /* Load root. */ 1260 ref.low = cpu_to_le32(MFT_REC_ROOT); 1261 ref.seq = cpu_to_le16(MFT_REC_ROOT); 1262 inode = ntfs_iget5(sb, &ref, &NAME_ROOT); 1263 if (IS_ERR(inode)) { 1264 ntfs_err(sb, "Failed to load root."); 1265 err = PTR_ERR(inode); 1266 goto out; 1267 } 1268 1269 sb->s_root = d_make_root(inode); 1270 if (!sb->s_root) { 1271 err = -ENOMEM; 1272 goto put_inode_out; 1273 } 1274 1275 return 0; 1276 1277 put_inode_out: 1278 iput(inode); 1279 out: 1280 /* 1281 * Free resources here. 1282 * ntfs_fs_free will be called with fc->s_fs_info = NULL 1283 */ 1284 put_ntfs(sbi); 1285 sb->s_fs_info = NULL; 1286 1287 return err; 1288 } 1289 1290 void ntfs_unmap_meta(struct super_block *sb, CLST lcn, CLST len) 1291 { 1292 struct ntfs_sb_info *sbi = sb->s_fs_info; 1293 struct block_device *bdev = sb->s_bdev; 1294 sector_t devblock = (u64)lcn * sbi->blocks_per_cluster; 1295 unsigned long blocks = (u64)len * sbi->blocks_per_cluster; 1296 unsigned long cnt = 0; 1297 unsigned long limit = global_zone_page_state(NR_FREE_PAGES) 1298 << (PAGE_SHIFT - sb->s_blocksize_bits); 1299 1300 if (limit >= 0x2000) 1301 limit -= 0x1000; 1302 else if (limit < 32) 1303 limit = 32; 1304 else 1305 limit >>= 1; 1306 1307 while (blocks--) { 1308 clean_bdev_aliases(bdev, devblock++, 1); 1309 if (cnt++ >= limit) { 1310 sync_blockdev(bdev); 1311 cnt = 0; 1312 } 1313 } 1314 } 1315 1316 /* 1317 * ntfs_discard - Issue a discard request (trim for SSD). 1318 */ 1319 int ntfs_discard(struct ntfs_sb_info *sbi, CLST lcn, CLST len) 1320 { 1321 int err; 1322 u64 lbo, bytes, start, end; 1323 struct super_block *sb; 1324 1325 if (sbi->used.next_free_lcn == lcn + len) 1326 sbi->used.next_free_lcn = lcn; 1327 1328 if (sbi->flags & NTFS_FLAGS_NODISCARD) 1329 return -EOPNOTSUPP; 1330 1331 if (!sbi->options->discard) 1332 return -EOPNOTSUPP; 1333 1334 lbo = (u64)lcn << sbi->cluster_bits; 1335 bytes = (u64)len << sbi->cluster_bits; 1336 1337 /* Align up 'start' on discard_granularity. */ 1338 start = (lbo + sbi->discard_granularity - 1) & 1339 sbi->discard_granularity_mask_inv; 1340 /* Align down 'end' on discard_granularity. */ 1341 end = (lbo + bytes) & sbi->discard_granularity_mask_inv; 1342 1343 sb = sbi->sb; 1344 if (start >= end) 1345 return 0; 1346 1347 err = blkdev_issue_discard(sb->s_bdev, start >> 9, (end - start) >> 9, 1348 GFP_NOFS); 1349 1350 if (err == -EOPNOTSUPP) 1351 sbi->flags |= NTFS_FLAGS_NODISCARD; 1352 1353 return err; 1354 } 1355 1356 static int ntfs_fs_get_tree(struct fs_context *fc) 1357 { 1358 return get_tree_bdev(fc, ntfs_fill_super); 1359 } 1360 1361 /* 1362 * ntfs_fs_free - Free fs_context. 1363 * 1364 * Note that this will be called after fill_super and reconfigure 1365 * even when they pass. So they have to take pointers if they pass. 1366 */ 1367 static void ntfs_fs_free(struct fs_context *fc) 1368 { 1369 struct ntfs_mount_options *opts = fc->fs_private; 1370 struct ntfs_sb_info *sbi = fc->s_fs_info; 1371 1372 if (sbi) 1373 put_ntfs(sbi); 1374 1375 if (opts) 1376 put_mount_options(opts); 1377 } 1378 1379 static const struct fs_context_operations ntfs_context_ops = { 1380 .parse_param = ntfs_fs_parse_param, 1381 .get_tree = ntfs_fs_get_tree, 1382 .reconfigure = ntfs_fs_reconfigure, 1383 .free = ntfs_fs_free, 1384 }; 1385 1386 /* 1387 * ntfs_init_fs_context - Initialize spi and opts 1388 * 1389 * This will called when mount/remount. We will first initialize 1390 * options so that if remount we can use just that. 1391 */ 1392 static int ntfs_init_fs_context(struct fs_context *fc) 1393 { 1394 struct ntfs_mount_options *opts; 1395 struct ntfs_sb_info *sbi; 1396 1397 opts = kzalloc(sizeof(struct ntfs_mount_options), GFP_NOFS); 1398 if (!opts) 1399 return -ENOMEM; 1400 1401 /* Default options. */ 1402 opts->fs_uid = current_uid(); 1403 opts->fs_gid = current_gid(); 1404 opts->fs_fmask_inv = ~current_umask(); 1405 opts->fs_dmask_inv = ~current_umask(); 1406 1407 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) 1408 goto ok; 1409 1410 sbi = kzalloc(sizeof(struct ntfs_sb_info), GFP_NOFS); 1411 if (!sbi) 1412 goto free_opts; 1413 1414 sbi->upcase = kvmalloc(0x10000 * sizeof(short), GFP_KERNEL); 1415 if (!sbi->upcase) 1416 goto free_sbi; 1417 1418 ratelimit_state_init(&sbi->msg_ratelimit, DEFAULT_RATELIMIT_INTERVAL, 1419 DEFAULT_RATELIMIT_BURST); 1420 1421 mutex_init(&sbi->compress.mtx_lznt); 1422 #ifdef CONFIG_NTFS3_LZX_XPRESS 1423 mutex_init(&sbi->compress.mtx_xpress); 1424 mutex_init(&sbi->compress.mtx_lzx); 1425 #endif 1426 1427 fc->s_fs_info = sbi; 1428 ok: 1429 fc->fs_private = opts; 1430 fc->ops = &ntfs_context_ops; 1431 1432 return 0; 1433 free_sbi: 1434 kfree(sbi); 1435 free_opts: 1436 kfree(opts); 1437 return -ENOMEM; 1438 } 1439 1440 // clang-format off 1441 static struct file_system_type ntfs_fs_type = { 1442 .owner = THIS_MODULE, 1443 .name = "ntfs3", 1444 .init_fs_context = ntfs_init_fs_context, 1445 .parameters = ntfs_fs_parameters, 1446 .kill_sb = kill_block_super, 1447 .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP, 1448 }; 1449 // clang-format on 1450 1451 static int __init init_ntfs_fs(void) 1452 { 1453 int err; 1454 1455 pr_info("ntfs3: Max link count %u\n", NTFS_LINK_MAX); 1456 1457 if (IS_ENABLED(CONFIG_NTFS3_FS_POSIX_ACL)) 1458 pr_info("ntfs3: Enabled Linux POSIX ACLs support\n"); 1459 if (IS_ENABLED(CONFIG_NTFS3_64BIT_CLUSTER)) 1460 pr_notice("ntfs3: Warning: Activated 64 bits per cluster. Windows does not support this\n"); 1461 if (IS_ENABLED(CONFIG_NTFS3_LZX_XPRESS)) 1462 pr_info("ntfs3: Read-only LZX/Xpress compression included\n"); 1463 1464 err = ntfs3_init_bitmap(); 1465 if (err) 1466 return err; 1467 1468 ntfs_inode_cachep = kmem_cache_create( 1469 "ntfs_inode_cache", sizeof(struct ntfs_inode), 0, 1470 (SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD | SLAB_ACCOUNT), 1471 init_once); 1472 if (!ntfs_inode_cachep) { 1473 err = -ENOMEM; 1474 goto out1; 1475 } 1476 1477 err = register_filesystem(&ntfs_fs_type); 1478 if (err) 1479 goto out; 1480 1481 return 0; 1482 out: 1483 kmem_cache_destroy(ntfs_inode_cachep); 1484 out1: 1485 ntfs3_exit_bitmap(); 1486 return err; 1487 } 1488 1489 static void __exit exit_ntfs_fs(void) 1490 { 1491 if (ntfs_inode_cachep) { 1492 rcu_barrier(); 1493 kmem_cache_destroy(ntfs_inode_cachep); 1494 } 1495 1496 unregister_filesystem(&ntfs_fs_type); 1497 ntfs3_exit_bitmap(); 1498 } 1499 1500 MODULE_LICENSE("GPL"); 1501 MODULE_DESCRIPTION("ntfs3 read/write filesystem"); 1502 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 1503 MODULE_INFO(behaviour, "Enabled Linux POSIX ACLs support"); 1504 #endif 1505 #ifdef CONFIG_NTFS3_64BIT_CLUSTER 1506 MODULE_INFO(cluster, "Warning: Activated 64 bits per cluster. Windows does not support this"); 1507 #endif 1508 #ifdef CONFIG_NTFS3_LZX_XPRESS 1509 MODULE_INFO(compression, "Read-only lzx/xpress compression included"); 1510 #endif 1511 1512 MODULE_AUTHOR("Konstantin Komarov"); 1513 MODULE_ALIAS_FS("ntfs3"); 1514 1515 module_init(init_ntfs_fs); 1516 module_exit(exit_ntfs_fs); 1517