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