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 */
ntfs_printk(const struct super_block * sb,const char * fmt,...)77 void ntfs_printk(const struct super_block *sb, const char *fmt, ...)
78 {
79 struct va_format vaf;
80 va_list args;
81 int level;
82 struct ntfs_sb_info *sbi = sb->s_fs_info;
83
84 /* Should we use different ratelimits for warnings/notices/errors? */
85 if (!___ratelimit(&sbi->msg_ratelimit, "ntfs3"))
86 return;
87
88 va_start(args, fmt);
89
90 level = printk_get_level(fmt);
91 vaf.fmt = printk_skip_level(fmt);
92 vaf.va = &args;
93 printk("%c%cntfs3: %s: %pV\n", KERN_SOH_ASCII, level, sb->s_id, &vaf);
94
95 va_end(args);
96 }
97
98 static char s_name_buf[512];
99 static atomic_t s_name_buf_cnt = ATOMIC_INIT(1); // 1 means 'free s_name_buf'.
100
101 /*
102 * ntfs_inode_printk
103 *
104 * Print warnings/notices/errors about inode using name or inode number.
105 */
ntfs_inode_printk(struct inode * inode,const char * fmt,...)106 void ntfs_inode_printk(struct inode *inode, const char *fmt, ...)
107 {
108 struct super_block *sb = inode->i_sb;
109 struct ntfs_sb_info *sbi = sb->s_fs_info;
110 char *name;
111 va_list args;
112 struct va_format vaf;
113 int level;
114
115 if (!___ratelimit(&sbi->msg_ratelimit, "ntfs3"))
116 return;
117
118 /* Use static allocated buffer, if possible. */
119 name = atomic_dec_and_test(&s_name_buf_cnt) ?
120 s_name_buf :
121 kmalloc(sizeof(s_name_buf), GFP_NOFS);
122
123 if (name) {
124 struct dentry *de = d_find_alias(inode);
125 const u32 name_len = ARRAY_SIZE(s_name_buf) - 1;
126
127 if (de) {
128 spin_lock(&de->d_lock);
129 snprintf(name, name_len, " \"%s\"", de->d_name.name);
130 spin_unlock(&de->d_lock);
131 name[name_len] = 0; /* To be sure. */
132 } else {
133 name[0] = 0;
134 }
135 dput(de); /* Cocci warns if placed in branch "if (de)" */
136 }
137
138 va_start(args, fmt);
139
140 level = printk_get_level(fmt);
141 vaf.fmt = printk_skip_level(fmt);
142 vaf.va = &args;
143
144 printk("%c%cntfs3: %s: ino=%lx,%s %pV\n", KERN_SOH_ASCII, level,
145 sb->s_id, inode->i_ino, name ? name : "", &vaf);
146
147 va_end(args);
148
149 atomic_inc(&s_name_buf_cnt);
150 if (name != s_name_buf)
151 kfree(name);
152 }
153 #endif
154
155 /*
156 * Shared memory struct.
157 *
158 * On-disk ntfs's upcase table is created by ntfs formatter.
159 * 'upcase' table is 128K bytes of memory.
160 * We should read it into memory when mounting.
161 * Several ntfs volumes likely use the same 'upcase' table.
162 * It is good idea to share in-memory 'upcase' table between different volumes.
163 * Unfortunately winxp/vista/win7 use different upcase tables.
164 */
165 static DEFINE_SPINLOCK(s_shared_lock);
166
167 static struct {
168 void *ptr;
169 u32 len;
170 int cnt;
171 } s_shared[8];
172
173 /*
174 * ntfs_set_shared
175 *
176 * Return:
177 * * @ptr - If pointer was saved in shared memory.
178 * * NULL - If pointer was not shared.
179 */
ntfs_set_shared(void * ptr,u32 bytes)180 void *ntfs_set_shared(void *ptr, u32 bytes)
181 {
182 void *ret = NULL;
183 int i, j = -1;
184
185 spin_lock(&s_shared_lock);
186 for (i = 0; i < ARRAY_SIZE(s_shared); i++) {
187 if (!s_shared[i].cnt) {
188 j = i;
189 } else if (bytes == s_shared[i].len &&
190 !memcmp(s_shared[i].ptr, ptr, bytes)) {
191 s_shared[i].cnt += 1;
192 ret = s_shared[i].ptr;
193 break;
194 }
195 }
196
197 if (!ret && j != -1) {
198 s_shared[j].ptr = ptr;
199 s_shared[j].len = bytes;
200 s_shared[j].cnt = 1;
201 ret = ptr;
202 }
203 spin_unlock(&s_shared_lock);
204
205 return ret;
206 }
207
208 /*
209 * ntfs_put_shared
210 *
211 * Return:
212 * * @ptr - If pointer is not shared anymore.
213 * * NULL - If pointer is still shared.
214 */
ntfs_put_shared(void * ptr)215 void *ntfs_put_shared(void *ptr)
216 {
217 void *ret = ptr;
218 int i;
219
220 spin_lock(&s_shared_lock);
221 for (i = 0; i < ARRAY_SIZE(s_shared); i++) {
222 if (s_shared[i].cnt && s_shared[i].ptr == ptr) {
223 if (--s_shared[i].cnt)
224 ret = NULL;
225 break;
226 }
227 }
228 spin_unlock(&s_shared_lock);
229
230 return ret;
231 }
232
put_mount_options(struct ntfs_mount_options * options)233 static inline void put_mount_options(struct ntfs_mount_options *options)
234 {
235 kfree(options->nls_name);
236 unload_nls(options->nls);
237 kfree(options);
238 }
239
240 enum Opt {
241 Opt_uid,
242 Opt_gid,
243 Opt_umask,
244 Opt_dmask,
245 Opt_fmask,
246 Opt_immutable,
247 Opt_discard,
248 Opt_force,
249 Opt_sparse,
250 Opt_nohidden,
251 Opt_hide_dot_files,
252 Opt_windows_names,
253 Opt_showmeta,
254 Opt_acl,
255 Opt_iocharset,
256 Opt_prealloc,
257 Opt_nocase,
258 Opt_err,
259 };
260
261 // clang-format off
262 static const struct fs_parameter_spec ntfs_fs_parameters[] = {
263 fsparam_u32("uid", Opt_uid),
264 fsparam_u32("gid", Opt_gid),
265 fsparam_u32oct("umask", Opt_umask),
266 fsparam_u32oct("dmask", Opt_dmask),
267 fsparam_u32oct("fmask", Opt_fmask),
268 fsparam_flag_no("sys_immutable", Opt_immutable),
269 fsparam_flag_no("discard", Opt_discard),
270 fsparam_flag_no("force", Opt_force),
271 fsparam_flag_no("sparse", Opt_sparse),
272 fsparam_flag_no("hidden", Opt_nohidden),
273 fsparam_flag_no("hide_dot_files", Opt_hide_dot_files),
274 fsparam_flag_no("windows_names", Opt_windows_names),
275 fsparam_flag_no("showmeta", Opt_showmeta),
276 fsparam_flag_no("acl", Opt_acl),
277 fsparam_string("iocharset", Opt_iocharset),
278 fsparam_flag_no("prealloc", Opt_prealloc),
279 fsparam_flag_no("nocase", Opt_nocase),
280 {}
281 };
282 // clang-format on
283
284 /*
285 * Load nls table or if @nls is utf8 then return NULL.
286 *
287 * It is good idea to use here "const char *nls".
288 * But load_nls accepts "char*".
289 */
ntfs_load_nls(char * nls)290 static struct nls_table *ntfs_load_nls(char *nls)
291 {
292 struct nls_table *ret;
293
294 if (!nls)
295 nls = CONFIG_NLS_DEFAULT;
296
297 if (strcmp(nls, "utf8") == 0)
298 return NULL;
299
300 if (strcmp(nls, CONFIG_NLS_DEFAULT) == 0)
301 return load_nls_default();
302
303 ret = load_nls(nls);
304 if (ret)
305 return ret;
306
307 return ERR_PTR(-EINVAL);
308 }
309
ntfs_fs_parse_param(struct fs_context * fc,struct fs_parameter * param)310 static int ntfs_fs_parse_param(struct fs_context *fc,
311 struct fs_parameter *param)
312 {
313 struct ntfs_mount_options *opts = fc->fs_private;
314 struct fs_parse_result result;
315 int opt;
316
317 opt = fs_parse(fc, ntfs_fs_parameters, param, &result);
318 if (opt < 0)
319 return opt;
320
321 switch (opt) {
322 case Opt_uid:
323 opts->fs_uid = make_kuid(current_user_ns(), result.uint_32);
324 if (!uid_valid(opts->fs_uid))
325 return invalf(fc, "ntfs3: Invalid value for uid.");
326 break;
327 case Opt_gid:
328 opts->fs_gid = make_kgid(current_user_ns(), result.uint_32);
329 if (!gid_valid(opts->fs_gid))
330 return invalf(fc, "ntfs3: Invalid value for gid.");
331 break;
332 case Opt_umask:
333 if (result.uint_32 & ~07777)
334 return invalf(fc, "ntfs3: Invalid value for umask.");
335 opts->fs_fmask_inv = ~result.uint_32;
336 opts->fs_dmask_inv = ~result.uint_32;
337 opts->fmask = 1;
338 opts->dmask = 1;
339 break;
340 case Opt_dmask:
341 if (result.uint_32 & ~07777)
342 return invalf(fc, "ntfs3: Invalid value for dmask.");
343 opts->fs_dmask_inv = ~result.uint_32;
344 opts->dmask = 1;
345 break;
346 case Opt_fmask:
347 if (result.uint_32 & ~07777)
348 return invalf(fc, "ntfs3: Invalid value for fmask.");
349 opts->fs_fmask_inv = ~result.uint_32;
350 opts->fmask = 1;
351 break;
352 case Opt_immutable:
353 opts->sys_immutable = result.negated ? 0 : 1;
354 break;
355 case Opt_discard:
356 opts->discard = result.negated ? 0 : 1;
357 break;
358 case Opt_force:
359 opts->force = result.negated ? 0 : 1;
360 break;
361 case Opt_sparse:
362 opts->sparse = result.negated ? 0 : 1;
363 break;
364 case Opt_nohidden:
365 opts->nohidden = result.negated ? 1 : 0;
366 break;
367 case Opt_hide_dot_files:
368 opts->hide_dot_files = result.negated ? 0 : 1;
369 break;
370 case Opt_windows_names:
371 opts->windows_names = result.negated ? 0 : 1;
372 break;
373 case Opt_showmeta:
374 opts->showmeta = result.negated ? 0 : 1;
375 break;
376 case Opt_acl:
377 if (!result.negated)
378 #ifdef CONFIG_NTFS3_FS_POSIX_ACL
379 fc->sb_flags |= SB_POSIXACL;
380 #else
381 return invalf(
382 fc, "ntfs3: Support for ACL not compiled in!");
383 #endif
384 else
385 fc->sb_flags &= ~SB_POSIXACL;
386 break;
387 case Opt_iocharset:
388 kfree(opts->nls_name);
389 opts->nls_name = param->string;
390 param->string = NULL;
391 break;
392 case Opt_prealloc:
393 opts->prealloc = result.negated ? 0 : 1;
394 break;
395 case Opt_nocase:
396 opts->nocase = result.negated ? 1 : 0;
397 break;
398 default:
399 /* Should not be here unless we forget add case. */
400 return -EINVAL;
401 }
402 return 0;
403 }
404
ntfs_fs_reconfigure(struct fs_context * fc)405 static int ntfs_fs_reconfigure(struct fs_context *fc)
406 {
407 struct super_block *sb = fc->root->d_sb;
408 struct ntfs_sb_info *sbi = sb->s_fs_info;
409 struct ntfs_mount_options *new_opts = fc->fs_private;
410 int ro_rw;
411
412 ro_rw = sb_rdonly(sb) && !(fc->sb_flags & SB_RDONLY);
413 if (ro_rw && (sbi->flags & NTFS_FLAGS_NEED_REPLAY)) {
414 errorf(fc,
415 "ntfs3: Couldn't remount rw because journal is not replayed. Please umount/remount instead\n");
416 return -EINVAL;
417 }
418
419 new_opts->nls = ntfs_load_nls(new_opts->nls_name);
420 if (IS_ERR(new_opts->nls)) {
421 new_opts->nls = NULL;
422 errorf(fc, "ntfs3: Cannot load iocharset %s",
423 new_opts->nls_name);
424 return -EINVAL;
425 }
426 if (new_opts->nls != sbi->options->nls)
427 return invalf(
428 fc,
429 "ntfs3: Cannot use different iocharset when remounting!");
430
431 sync_filesystem(sb);
432
433 if (ro_rw && (sbi->volume.flags & VOLUME_FLAG_DIRTY) &&
434 !new_opts->force) {
435 errorf(fc,
436 "ntfs3: Volume is dirty and \"force\" flag is not set!");
437 return -EINVAL;
438 }
439
440 swap(sbi->options, fc->fs_private);
441
442 return 0;
443 }
444
445 #ifdef CONFIG_PROC_FS
446 static struct proc_dir_entry *proc_info_root;
447
448 /*
449 * ntfs3_volinfo:
450 *
451 * The content of /proc/fs/ntfs3/<dev>/volinfo
452 *
453 * ntfs3.1
454 * cluster size
455 * number of clusters
456 * 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 */
ntfs3_volinfo(struct seq_file * m,void * o)461 static 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
ntfs3_volinfo_open(struct inode * inode,struct file * file)477 static 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 */
ntfs3_label_show(struct seq_file * m,void * o)483 static 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 */
ntfs3_label_write(struct file * file,const char __user * buffer,size_t count,loff_t * ppos)494 static 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;
527 out:
528 kfree(label);
529 return ret;
530 }
531
ntfs3_label_open(struct inode * inode,struct file * file)532 static int ntfs3_label_open(struct inode *inode, struct file *file)
533 {
534 return single_open(file, ntfs3_label_show, pde_data(inode));
535 }
536
537 static 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
544 static 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
554 static struct kmem_cache *ntfs_inode_cachep;
555
ntfs_alloc_inode(struct super_block * sb)556 static 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
ntfs_free_inode(struct inode * inode)568 static 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
init_once(void * foo)576 static 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 */
ntfs3_put_sbi(struct ntfs_sb_info * sbi)586 static 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
ntfs3_free_sbi(struct ntfs_sb_info * sbi)624 static 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
ntfs_put_super(struct super_block * sb)637 static 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
ntfs_statfs(struct dentry * dentry,struct kstatfs * buf)656 static 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
ntfs_show_options(struct seq_file * m,struct dentry * root)674 static 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 */
ntfs_shutdown(struct super_block * sb)720 static 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 */
ntfs_sync_fs(struct super_block * sb,int wait)728 static 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
770 static 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
ntfs_export_get_inode(struct super_block * sb,u64 ino,u32 generation)782 static 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
ntfs_fh_to_dentry(struct super_block * sb,struct fid * fid,int fh_len,int fh_type)805 static 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
ntfs_fh_to_parent(struct super_block * sb,struct fid * fid,int fh_len,int fh_type)812 static 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 */
ntfs_nfs_commit_metadata(struct inode * inode)820 static int ntfs_nfs_commit_metadata(struct inode *inode)
821 {
822 return _ni_write_inode(inode, 1);
823 }
824
825 static 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 */
format_size_gb(const u64 bytes,u32 * mb)835 static 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
true_sectors_per_clst(const struct NTFS_BOOT * boot)848 static 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 */
ntfs_init_from_boot(struct super_block * sb,u32 sector_size,u64 dev_size,struct NTFS_BOOT ** boot2)867 static 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
888 read_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
1122 out:
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 */
ntfs_fill_super(struct super_block * sb,struct fs_context * fc)1148 static 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
1552 load_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
1618 put_inode_out:
1619 iput(inode);
1620 out:
1621 ntfs3_put_sbi(sbi);
1622 kfree(boot2);
1623 ntfs3_put_sbi(sbi);
1624 return err;
1625 }
1626
ntfs_unmap_meta(struct super_block * sb,CLST lcn,CLST len)1627 void 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 */
ntfs_discard(struct ntfs_sb_info * sbi,CLST lcn,CLST len)1656 int 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
ntfs_fs_get_tree(struct fs_context * fc)1693 static 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 */
ntfs_fs_free(struct fs_context * fc)1704 static 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
1719 static 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 */
ntfs_init_fs_context(struct fs_context * fc)1733 static 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;
1769 ok:
1770 fc->fs_private = opts;
1771 fc->ops = &ntfs_context_ops;
1772
1773 return 0;
1774 free_sbi:
1775 kfree(sbi);
1776 free_opts:
1777 kfree(opts);
1778 return -ENOMEM;
1779 }
1780
ntfs3_kill_sb(struct super_block * sb)1781 static 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
1793 static 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
init_ntfs_fs(void)1803 static int __init init_ntfs_fs(void)
1804 {
1805 int err;
1806
1807 if (IS_ENABLED(CONFIG_NTFS3_FS_POSIX_ACL))
1808 pr_info("ntfs3: Enabled Linux POSIX ACLs support\n");
1809 if (IS_ENABLED(CONFIG_NTFS3_64BIT_CLUSTER))
1810 pr_notice(
1811 "ntfs3: Warning: Activated 64 bits per cluster. Windows does not support this\n");
1812 if (IS_ENABLED(CONFIG_NTFS3_LZX_XPRESS))
1813 pr_info("ntfs3: Read-only LZX/Xpress compression included\n");
1814
1815 #ifdef CONFIG_PROC_FS
1816 /* Create "/proc/fs/ntfs3" */
1817 proc_info_root = proc_mkdir("fs/ntfs3", NULL);
1818 #endif
1819
1820 err = ntfs3_init_bitmap();
1821 if (err)
1822 return err;
1823
1824 ntfs_inode_cachep = kmem_cache_create(
1825 "ntfs_inode_cache", sizeof(struct ntfs_inode), 0,
1826 (SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD | SLAB_ACCOUNT),
1827 init_once);
1828 if (!ntfs_inode_cachep) {
1829 err = -ENOMEM;
1830 goto out1;
1831 }
1832
1833 err = register_filesystem(&ntfs_fs_type);
1834 if (err)
1835 goto out;
1836
1837 return 0;
1838 out:
1839 kmem_cache_destroy(ntfs_inode_cachep);
1840 out1:
1841 ntfs3_exit_bitmap();
1842 return err;
1843 }
1844
exit_ntfs_fs(void)1845 static void __exit exit_ntfs_fs(void)
1846 {
1847 rcu_barrier();
1848 kmem_cache_destroy(ntfs_inode_cachep);
1849 unregister_filesystem(&ntfs_fs_type);
1850 ntfs3_exit_bitmap();
1851
1852 #ifdef CONFIG_PROC_FS
1853 if (proc_info_root)
1854 remove_proc_entry("fs/ntfs3", NULL);
1855 #endif
1856 }
1857
1858 MODULE_LICENSE("GPL");
1859 MODULE_DESCRIPTION("ntfs3 read/write filesystem");
1860 #ifdef CONFIG_NTFS3_FS_POSIX_ACL
1861 MODULE_INFO(behaviour, "Enabled Linux POSIX ACLs support");
1862 #endif
1863 #ifdef CONFIG_NTFS3_64BIT_CLUSTER
1864 MODULE_INFO(
1865 cluster,
1866 "Warning: Activated 64 bits per cluster. Windows does not support this");
1867 #endif
1868 #ifdef CONFIG_NTFS3_LZX_XPRESS
1869 MODULE_INFO(compression, "Read-only lzx/xpress compression included");
1870 #endif
1871
1872 MODULE_AUTHOR("Konstantin Komarov");
1873 MODULE_ALIAS_FS("ntfs3");
1874
1875 module_init(init_ntfs_fs);
1876 module_exit(exit_ntfs_fs);
1877