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[thirdparty/kernel/stable.git] / fs / ntfs3 / super.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 *
4 * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
5 *
6 *
7 * terminology
8 *
9 * cluster - allocation unit - 512,1K,2K,4K,...,2M
10 * vcn - virtual cluster number - Offset inside the file in clusters.
11 * vbo - virtual byte offset - Offset inside the file in bytes.
12 * lcn - logical cluster number - 0 based cluster in clusters heap.
13 * lbo - logical byte offset - Absolute position inside volume.
14 * run - maps VCN to LCN - Stored in attributes in packed form.
15 * attr - attribute segment - std/name/data etc records inside MFT.
16 * mi - MFT inode - One MFT record(usually 1024 bytes or 4K), consists of attributes.
17 * ni - NTFS inode - Extends linux inode. consists of one or more mft inodes.
18 * index - unit inside directory - 2K, 4K, <=page size, does not depend on cluster size.
19 *
20 * WSL - Windows Subsystem for Linux
21 * https://docs.microsoft.com/en-us/windows/wsl/file-permissions
22 * It stores uid/gid/mode/dev in xattr
23 *
24 * ntfs allows up to 2^64 clusters per volume.
25 * It means you should use 64 bits lcn to operate with ntfs.
26 * Implementation of ntfs.sys uses only 32 bits lcn.
27 * Default ntfs3 uses 32 bits lcn too.
28 * ntfs3 built with CONFIG_NTFS3_64BIT_CLUSTER (ntfs3_64) uses 64 bits per lcn.
29 *
30 *
31 * ntfs limits, cluster size is 4K (2^12)
32 * -----------------------------------------------------------------------------
33 * | Volume size | Clusters | ntfs.sys | ntfs3 | ntfs3_64 | mkntfs | chkdsk |
34 * -----------------------------------------------------------------------------
35 * | < 16T, 2^44 | < 2^32 | yes | yes | yes | yes | yes |
36 * | > 16T, 2^44 | > 2^32 | no | no | yes | yes | yes |
37 * ----------------------------------------------------------|------------------
38 *
39 * To mount large volumes as ntfs one should use large cluster size (up to 2M)
40 * The maximum volume size in this case is 2^32 * 2^21 = 2^53 = 8P
41 *
42 * ntfs limits, cluster size is 2M (2^21)
43 * -----------------------------------------------------------------------------
44 * | < 8P, 2^53 | < 2^32 | yes | yes | yes | yes | yes |
45 * | > 8P, 2^53 | > 2^32 | no | no | yes | yes | yes |
46 * ----------------------------------------------------------|------------------
47 *
48 */
49
50 #include <linux/blkdev.h>
51 #include <linux/buffer_head.h>
52 #include <linux/exportfs.h>
53 #include <linux/fs.h>
54 #include <linux/fs_context.h>
55 #include <linux/fs_parser.h>
56 #include <linux/log2.h>
57 #include <linux/minmax.h>
58 #include <linux/module.h>
59 #include <linux/nls.h>
60 #include <linux/proc_fs.h>
61 #include <linux/seq_file.h>
62 #include <linux/statfs.h>
63
64 #include "debug.h"
65 #include "ntfs.h"
66 #include "ntfs_fs.h"
67 #ifdef CONFIG_NTFS3_LZX_XPRESS
68 #include "lib/lib.h"
69 #endif
70
71 #ifdef CONFIG_PRINTK
72 /*
73 * ntfs_printk - Trace warnings/notices/errors.
74 *
75 * Thanks Joe Perches <joe@perches.com> for implementation
76 */
77 void ntfs_printk(const struct super_block *sb, const char *fmt, ...)
78 {
79 struct va_format vaf;
80 va_list args;
81 int level;
82 struct ntfs_sb_info *sbi = sb->s_fs_info;
83
84 /* Should we use different ratelimits for warnings/notices/errors? */
85 if (!___ratelimit(&sbi->msg_ratelimit, "ntfs3"))
86 return;
87
88 va_start(args, fmt);
89
90 level = printk_get_level(fmt);
91 vaf.fmt = printk_skip_level(fmt);
92 vaf.va = &args;
93 printk("%c%cntfs3: %s: %pV\n", KERN_SOH_ASCII, level, sb->s_id, &vaf);
94
95 va_end(args);
96 }
97
98 static char s_name_buf[512];
99 static atomic_t s_name_buf_cnt = ATOMIC_INIT(1); // 1 means 'free s_name_buf'.
100
101 /*
102 * ntfs_inode_printk
103 *
104 * Print warnings/notices/errors about inode using name or inode number.
105 */
106 void ntfs_inode_printk(struct inode *inode, const char *fmt, ...)
107 {
108 struct super_block *sb = inode->i_sb;
109 struct ntfs_sb_info *sbi = sb->s_fs_info;
110 char *name;
111 va_list args;
112 struct va_format vaf;
113 int level;
114
115 if (!___ratelimit(&sbi->msg_ratelimit, "ntfs3"))
116 return;
117
118 /* Use static allocated buffer, if possible. */
119 name = atomic_dec_and_test(&s_name_buf_cnt) ?
120 s_name_buf :
121 kmalloc(sizeof(s_name_buf), GFP_NOFS);
122
123 if (name) {
124 struct dentry *de = d_find_alias(inode);
125 const u32 name_len = ARRAY_SIZE(s_name_buf) - 1;
126
127 if (de) {
128 spin_lock(&de->d_lock);
129 snprintf(name, name_len, " \"%s\"", de->d_name.name);
130 spin_unlock(&de->d_lock);
131 name[name_len] = 0; /* To be sure. */
132 } else {
133 name[0] = 0;
134 }
135 dput(de); /* Cocci warns if placed in branch "if (de)" */
136 }
137
138 va_start(args, fmt);
139
140 level = printk_get_level(fmt);
141 vaf.fmt = printk_skip_level(fmt);
142 vaf.va = &args;
143
144 printk("%c%cntfs3: %s: ino=%lx,%s %pV\n", KERN_SOH_ASCII, level,
145 sb->s_id, inode->i_ino, name ? name : "", &vaf);
146
147 va_end(args);
148
149 atomic_inc(&s_name_buf_cnt);
150 if (name != s_name_buf)
151 kfree(name);
152 }
153 #endif
154
155 /*
156 * Shared memory struct.
157 *
158 * On-disk ntfs's upcase table is created by ntfs formatter.
159 * 'upcase' table is 128K bytes of memory.
160 * We should read it into memory when mounting.
161 * Several ntfs volumes likely use the same 'upcase' table.
162 * It is good idea to share in-memory 'upcase' table between different volumes.
163 * Unfortunately winxp/vista/win7 use different upcase tables.
164 */
165 static DEFINE_SPINLOCK(s_shared_lock);
166
167 static struct {
168 void *ptr;
169 u32 len;
170 int cnt;
171 } s_shared[8];
172
173 /*
174 * ntfs_set_shared
175 *
176 * Return:
177 * * @ptr - If pointer was saved in shared memory.
178 * * NULL - If pointer was not shared.
179 */
180 void *ntfs_set_shared(void *ptr, u32 bytes)
181 {
182 void *ret = NULL;
183 int i, j = -1;
184
185 spin_lock(&s_shared_lock);
186 for (i = 0; i < ARRAY_SIZE(s_shared); i++) {
187 if (!s_shared[i].cnt) {
188 j = i;
189 } else if (bytes == s_shared[i].len &&
190 !memcmp(s_shared[i].ptr, ptr, bytes)) {
191 s_shared[i].cnt += 1;
192 ret = s_shared[i].ptr;
193 break;
194 }
195 }
196
197 if (!ret && j != -1) {
198 s_shared[j].ptr = ptr;
199 s_shared[j].len = bytes;
200 s_shared[j].cnt = 1;
201 ret = ptr;
202 }
203 spin_unlock(&s_shared_lock);
204
205 return ret;
206 }
207
208 /*
209 * ntfs_put_shared
210 *
211 * Return:
212 * * @ptr - If pointer is not shared anymore.
213 * * NULL - If pointer is still shared.
214 */
215 void *ntfs_put_shared(void *ptr)
216 {
217 void *ret = ptr;
218 int i;
219
220 spin_lock(&s_shared_lock);
221 for (i = 0; i < ARRAY_SIZE(s_shared); i++) {
222 if (s_shared[i].cnt && s_shared[i].ptr == ptr) {
223 if (--s_shared[i].cnt)
224 ret = NULL;
225 break;
226 }
227 }
228 spin_unlock(&s_shared_lock);
229
230 return ret;
231 }
232
233 static inline void put_mount_options(struct ntfs_mount_options *options)
234 {
235 kfree(options->nls_name);
236 unload_nls(options->nls);
237 kfree(options);
238 }
239
240 enum Opt {
241 Opt_uid,
242 Opt_gid,
243 Opt_umask,
244 Opt_dmask,
245 Opt_fmask,
246 Opt_immutable,
247 Opt_discard,
248 Opt_force,
249 Opt_sparse,
250 Opt_nohidden,
251 Opt_hide_dot_files,
252 Opt_windows_names,
253 Opt_showmeta,
254 Opt_acl,
255 Opt_iocharset,
256 Opt_prealloc,
257 Opt_nocase,
258 Opt_err,
259 };
260
261 // clang-format off
262 static const struct fs_parameter_spec ntfs_fs_parameters[] = {
263 fsparam_u32("uid", Opt_uid),
264 fsparam_u32("gid", Opt_gid),
265 fsparam_u32oct("umask", Opt_umask),
266 fsparam_u32oct("dmask", Opt_dmask),
267 fsparam_u32oct("fmask", Opt_fmask),
268 fsparam_flag_no("sys_immutable", Opt_immutable),
269 fsparam_flag_no("discard", Opt_discard),
270 fsparam_flag_no("force", Opt_force),
271 fsparam_flag_no("sparse", Opt_sparse),
272 fsparam_flag_no("hidden", Opt_nohidden),
273 fsparam_flag_no("hide_dot_files", Opt_hide_dot_files),
274 fsparam_flag_no("windows_names", Opt_windows_names),
275 fsparam_flag_no("showmeta", Opt_showmeta),
276 fsparam_flag_no("acl", Opt_acl),
277 fsparam_string("iocharset", Opt_iocharset),
278 fsparam_flag_no("prealloc", Opt_prealloc),
279 fsparam_flag_no("nocase", Opt_nocase),
280 {}
281 };
282 // clang-format on
283
284 /*
285 * Load nls table or if @nls is utf8 then return NULL.
286 *
287 * It is good idea to use here "const char *nls".
288 * But load_nls accepts "char*".
289 */
290 static struct nls_table *ntfs_load_nls(char *nls)
291 {
292 struct nls_table *ret;
293
294 if (!nls)
295 nls = CONFIG_NLS_DEFAULT;
296
297 if (strcmp(nls, "utf8") == 0)
298 return NULL;
299
300 if (strcmp(nls, CONFIG_NLS_DEFAULT) == 0)
301 return load_nls_default();
302
303 ret = load_nls(nls);
304 if (ret)
305 return ret;
306
307 return ERR_PTR(-EINVAL);
308 }
309
310 static int ntfs_fs_parse_param(struct fs_context *fc,
311 struct fs_parameter *param)
312 {
313 struct ntfs_mount_options *opts = fc->fs_private;
314 struct fs_parse_result result;
315 int opt;
316
317 opt = fs_parse(fc, ntfs_fs_parameters, param, &result);
318 if (opt < 0)
319 return opt;
320
321 switch (opt) {
322 case Opt_uid:
323 opts->fs_uid = make_kuid(current_user_ns(), result.uint_32);
324 if (!uid_valid(opts->fs_uid))
325 return invalf(fc, "ntfs3: Invalid value for uid.");
326 break;
327 case Opt_gid:
328 opts->fs_gid = make_kgid(current_user_ns(), result.uint_32);
329 if (!gid_valid(opts->fs_gid))
330 return invalf(fc, "ntfs3: Invalid value for gid.");
331 break;
332 case Opt_umask:
333 if (result.uint_32 & ~07777)
334 return invalf(fc, "ntfs3: Invalid value for umask.");
335 opts->fs_fmask_inv = ~result.uint_32;
336 opts->fs_dmask_inv = ~result.uint_32;
337 opts->fmask = 1;
338 opts->dmask = 1;
339 break;
340 case Opt_dmask:
341 if (result.uint_32 & ~07777)
342 return invalf(fc, "ntfs3: Invalid value for dmask.");
343 opts->fs_dmask_inv = ~result.uint_32;
344 opts->dmask = 1;
345 break;
346 case Opt_fmask:
347 if (result.uint_32 & ~07777)
348 return invalf(fc, "ntfs3: Invalid value for fmask.");
349 opts->fs_fmask_inv = ~result.uint_32;
350 opts->fmask = 1;
351 break;
352 case Opt_immutable:
353 opts->sys_immutable = result.negated ? 0 : 1;
354 break;
355 case Opt_discard:
356 opts->discard = result.negated ? 0 : 1;
357 break;
358 case Opt_force:
359 opts->force = result.negated ? 0 : 1;
360 break;
361 case Opt_sparse:
362 opts->sparse = result.negated ? 0 : 1;
363 break;
364 case Opt_nohidden:
365 opts->nohidden = result.negated ? 1 : 0;
366 break;
367 case Opt_hide_dot_files:
368 opts->hide_dot_files = result.negated ? 0 : 1;
369 break;
370 case Opt_windows_names:
371 opts->windows_names = result.negated ? 0 : 1;
372 break;
373 case Opt_showmeta:
374 opts->showmeta = result.negated ? 0 : 1;
375 break;
376 case Opt_acl:
377 if (!result.negated)
378 #ifdef CONFIG_NTFS3_FS_POSIX_ACL
379 fc->sb_flags |= SB_POSIXACL;
380 #else
381 return invalf(
382 fc, "ntfs3: Support for ACL not compiled in!");
383 #endif
384 else
385 fc->sb_flags &= ~SB_POSIXACL;
386 break;
387 case Opt_iocharset:
388 kfree(opts->nls_name);
389 opts->nls_name = param->string;
390 param->string = NULL;
391 break;
392 case Opt_prealloc:
393 opts->prealloc = result.negated ? 0 : 1;
394 break;
395 case Opt_nocase:
396 opts->nocase = result.negated ? 1 : 0;
397 break;
398 default:
399 /* Should not be here unless we forget add case. */
400 return -EINVAL;
401 }
402 return 0;
403 }
404
405 static int ntfs_fs_reconfigure(struct fs_context *fc)
406 {
407 struct super_block *sb = fc->root->d_sb;
408 struct ntfs_sb_info *sbi = sb->s_fs_info;
409 struct ntfs_mount_options *new_opts = fc->fs_private;
410 int ro_rw;
411
412 ro_rw = sb_rdonly(sb) && !(fc->sb_flags & SB_RDONLY);
413 if (ro_rw && (sbi->flags & NTFS_FLAGS_NEED_REPLAY)) {
414 errorf(fc,
415 "ntfs3: Couldn't remount rw because journal is not replayed. Please umount/remount instead\n");
416 return -EINVAL;
417 }
418
419 new_opts->nls = ntfs_load_nls(new_opts->nls_name);
420 if (IS_ERR(new_opts->nls)) {
421 new_opts->nls = NULL;
422 errorf(fc, "ntfs3: Cannot load iocharset %s",
423 new_opts->nls_name);
424 return -EINVAL;
425 }
426 if (new_opts->nls != sbi->options->nls)
427 return invalf(
428 fc,
429 "ntfs3: Cannot use different iocharset when remounting!");
430
431 sync_filesystem(sb);
432
433 if (ro_rw && (sbi->volume.flags & VOLUME_FLAG_DIRTY) &&
434 !new_opts->force) {
435 errorf(fc,
436 "ntfs3: Volume is dirty and \"force\" flag is not set!");
437 return -EINVAL;
438 }
439
440 swap(sbi->options, fc->fs_private);
441
442 return 0;
443 }
444
445 #ifdef CONFIG_PROC_FS
446 static struct proc_dir_entry *proc_info_root;
447
448 /*
449 * ntfs3_volinfo:
450 *
451 * The content of /proc/fs/ntfs3/<dev>/volinfo
452 *
453 * ntfs3.1
454 * cluster size
455 * number of clusters
456 */
457 static int ntfs3_volinfo(struct seq_file *m, void *o)
458 {
459 struct super_block *sb = m->private;
460 struct ntfs_sb_info *sbi = sb->s_fs_info;
461
462 seq_printf(m, "ntfs%d.%d\n%u\n%zu\n", sbi->volume.major_ver,
463 sbi->volume.minor_ver, sbi->cluster_size,
464 sbi->used.bitmap.nbits);
465
466 return 0;
467 }
468
469 static int ntfs3_volinfo_open(struct inode *inode, struct file *file)
470 {
471 return single_open(file, ntfs3_volinfo, pde_data(inode));
472 }
473
474 /* read /proc/fs/ntfs3/<dev>/label */
475 static int ntfs3_label_show(struct seq_file *m, void *o)
476 {
477 struct super_block *sb = m->private;
478 struct ntfs_sb_info *sbi = sb->s_fs_info;
479
480 seq_printf(m, "%s\n", sbi->volume.label);
481
482 return 0;
483 }
484
485 /* write /proc/fs/ntfs3/<dev>/label */
486 static ssize_t ntfs3_label_write(struct file *file, const char __user *buffer,
487 size_t count, loff_t *ppos)
488 {
489 int err;
490 struct super_block *sb = pde_data(file_inode(file));
491 struct ntfs_sb_info *sbi = sb->s_fs_info;
492 ssize_t ret = count;
493 u8 *label = kmalloc(count, GFP_NOFS);
494
495 if (!label)
496 return -ENOMEM;
497
498 if (copy_from_user(label, buffer, ret)) {
499 ret = -EFAULT;
500 goto out;
501 }
502 while (ret > 0 && label[ret - 1] == '\n')
503 ret -= 1;
504
505 err = ntfs_set_label(sbi, label, ret);
506
507 if (err < 0) {
508 ntfs_err(sb, "failed (%d) to write label", err);
509 ret = err;
510 goto out;
511 }
512
513 *ppos += count;
514 ret = count;
515 out:
516 kfree(label);
517 return ret;
518 }
519
520 static int ntfs3_label_open(struct inode *inode, struct file *file)
521 {
522 return single_open(file, ntfs3_label_show, pde_data(inode));
523 }
524
525 static const struct proc_ops ntfs3_volinfo_fops = {
526 .proc_read = seq_read,
527 .proc_lseek = seq_lseek,
528 .proc_release = single_release,
529 .proc_open = ntfs3_volinfo_open,
530 };
531
532 static const struct proc_ops ntfs3_label_fops = {
533 .proc_read = seq_read,
534 .proc_lseek = seq_lseek,
535 .proc_release = single_release,
536 .proc_open = ntfs3_label_open,
537 .proc_write = ntfs3_label_write,
538 };
539
540 #endif
541
542 static struct kmem_cache *ntfs_inode_cachep;
543
544 static struct inode *ntfs_alloc_inode(struct super_block *sb)
545 {
546 struct ntfs_inode *ni = alloc_inode_sb(sb, ntfs_inode_cachep, GFP_NOFS);
547
548 if (!ni)
549 return NULL;
550
551 memset(ni, 0, offsetof(struct ntfs_inode, vfs_inode));
552 mutex_init(&ni->ni_lock);
553 return &ni->vfs_inode;
554 }
555
556 static void ntfs_free_inode(struct inode *inode)
557 {
558 struct ntfs_inode *ni = ntfs_i(inode);
559
560 mutex_destroy(&ni->ni_lock);
561 kmem_cache_free(ntfs_inode_cachep, ni);
562 }
563
564 static void init_once(void *foo)
565 {
566 struct ntfs_inode *ni = foo;
567
568 inode_init_once(&ni->vfs_inode);
569 }
570
571 /*
572 * Noinline to reduce binary size.
573 */
574 static noinline void ntfs3_put_sbi(struct ntfs_sb_info *sbi)
575 {
576 wnd_close(&sbi->mft.bitmap);
577 wnd_close(&sbi->used.bitmap);
578
579 if (sbi->mft.ni)
580 iput(&sbi->mft.ni->vfs_inode);
581
582 if (sbi->security.ni)
583 iput(&sbi->security.ni->vfs_inode);
584
585 if (sbi->reparse.ni)
586 iput(&sbi->reparse.ni->vfs_inode);
587
588 if (sbi->objid.ni)
589 iput(&sbi->objid.ni->vfs_inode);
590
591 if (sbi->volume.ni)
592 iput(&sbi->volume.ni->vfs_inode);
593
594 ntfs_update_mftmirr(sbi, 0);
595
596 indx_clear(&sbi->security.index_sii);
597 indx_clear(&sbi->security.index_sdh);
598 indx_clear(&sbi->reparse.index_r);
599 indx_clear(&sbi->objid.index_o);
600 }
601
602 static void ntfs3_free_sbi(struct ntfs_sb_info *sbi)
603 {
604 kfree(sbi->new_rec);
605 kvfree(ntfs_put_shared(sbi->upcase));
606 kfree(sbi->def_table);
607 kfree(sbi->compress.lznt);
608 #ifdef CONFIG_NTFS3_LZX_XPRESS
609 xpress_free_decompressor(sbi->compress.xpress);
610 lzx_free_decompressor(sbi->compress.lzx);
611 #endif
612 kfree(sbi);
613 }
614
615 static void ntfs_put_super(struct super_block *sb)
616 {
617 struct ntfs_sb_info *sbi = sb->s_fs_info;
618
619 #ifdef CONFIG_PROC_FS
620 // Remove /proc/fs/ntfs3/..
621 if (sbi->procdir) {
622 remove_proc_entry("label", sbi->procdir);
623 remove_proc_entry("volinfo", sbi->procdir);
624 remove_proc_entry(sb->s_id, proc_info_root);
625 sbi->procdir = NULL;
626 }
627 #endif
628
629 /* Mark rw ntfs as clear, if possible. */
630 ntfs_set_state(sbi, NTFS_DIRTY_CLEAR);
631 ntfs3_put_sbi(sbi);
632 }
633
634 static int ntfs_statfs(struct dentry *dentry, struct kstatfs *buf)
635 {
636 struct super_block *sb = dentry->d_sb;
637 struct ntfs_sb_info *sbi = sb->s_fs_info;
638 struct wnd_bitmap *wnd = &sbi->used.bitmap;
639
640 buf->f_type = sb->s_magic;
641 buf->f_bsize = sbi->cluster_size;
642 buf->f_blocks = wnd->nbits;
643
644 buf->f_bfree = buf->f_bavail = wnd_zeroes(wnd);
645 buf->f_fsid.val[0] = sbi->volume.ser_num;
646 buf->f_fsid.val[1] = (sbi->volume.ser_num >> 32);
647 buf->f_namelen = NTFS_NAME_LEN;
648
649 return 0;
650 }
651
652 static int ntfs_show_options(struct seq_file *m, struct dentry *root)
653 {
654 struct super_block *sb = root->d_sb;
655 struct ntfs_sb_info *sbi = sb->s_fs_info;
656 struct ntfs_mount_options *opts = sbi->options;
657 struct user_namespace *user_ns = seq_user_ns(m);
658
659 seq_printf(m, ",uid=%u", from_kuid_munged(user_ns, opts->fs_uid));
660 seq_printf(m, ",gid=%u", from_kgid_munged(user_ns, opts->fs_gid));
661 if (opts->dmask)
662 seq_printf(m, ",dmask=%04o", opts->fs_dmask_inv ^ 0xffff);
663 if (opts->fmask)
664 seq_printf(m, ",fmask=%04o", opts->fs_fmask_inv ^ 0xffff);
665 if (opts->sys_immutable)
666 seq_puts(m, ",sys_immutable");
667 if (opts->discard)
668 seq_puts(m, ",discard");
669 if (opts->force)
670 seq_puts(m, ",force");
671 if (opts->sparse)
672 seq_puts(m, ",sparse");
673 if (opts->nohidden)
674 seq_puts(m, ",nohidden");
675 if (opts->hide_dot_files)
676 seq_puts(m, ",hide_dot_files");
677 if (opts->windows_names)
678 seq_puts(m, ",windows_names");
679 if (opts->showmeta)
680 seq_puts(m, ",showmeta");
681 if (sb->s_flags & SB_POSIXACL)
682 seq_puts(m, ",acl");
683 if (opts->nls)
684 seq_printf(m, ",iocharset=%s", opts->nls->charset);
685 else
686 seq_puts(m, ",iocharset=utf8");
687 if (opts->prealloc)
688 seq_puts(m, ",prealloc");
689 if (opts->nocase)
690 seq_puts(m, ",nocase");
691
692 return 0;
693 }
694
695 /*
696 * ntfs_sync_fs - super_operations::sync_fs
697 */
698 static int ntfs_sync_fs(struct super_block *sb, int wait)
699 {
700 int err = 0, err2;
701 struct ntfs_sb_info *sbi = sb->s_fs_info;
702 struct ntfs_inode *ni;
703 struct inode *inode;
704
705 ni = sbi->security.ni;
706 if (ni) {
707 inode = &ni->vfs_inode;
708 err2 = _ni_write_inode(inode, wait);
709 if (err2 && !err)
710 err = err2;
711 }
712
713 ni = sbi->objid.ni;
714 if (ni) {
715 inode = &ni->vfs_inode;
716 err2 = _ni_write_inode(inode, wait);
717 if (err2 && !err)
718 err = err2;
719 }
720
721 ni = sbi->reparse.ni;
722 if (ni) {
723 inode = &ni->vfs_inode;
724 err2 = _ni_write_inode(inode, wait);
725 if (err2 && !err)
726 err = err2;
727 }
728
729 if (!err)
730 ntfs_set_state(sbi, NTFS_DIRTY_CLEAR);
731
732 ntfs_update_mftmirr(sbi, wait);
733
734 return err;
735 }
736
737 static const struct super_operations ntfs_sops = {
738 .alloc_inode = ntfs_alloc_inode,
739 .free_inode = ntfs_free_inode,
740 .evict_inode = ntfs_evict_inode,
741 .put_super = ntfs_put_super,
742 .statfs = ntfs_statfs,
743 .show_options = ntfs_show_options,
744 .sync_fs = ntfs_sync_fs,
745 .write_inode = ntfs3_write_inode,
746 };
747
748 static struct inode *ntfs_export_get_inode(struct super_block *sb, u64 ino,
749 u32 generation)
750 {
751 struct MFT_REF ref;
752 struct inode *inode;
753
754 ref.low = cpu_to_le32(ino);
755 #ifdef CONFIG_NTFS3_64BIT_CLUSTER
756 ref.high = cpu_to_le16(ino >> 32);
757 #else
758 ref.high = 0;
759 #endif
760 ref.seq = cpu_to_le16(generation);
761
762 inode = ntfs_iget5(sb, &ref, NULL);
763 if (!IS_ERR(inode) && is_bad_inode(inode)) {
764 iput(inode);
765 inode = ERR_PTR(-ESTALE);
766 }
767
768 return inode;
769 }
770
771 static struct dentry *ntfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
772 int fh_len, int fh_type)
773 {
774 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
775 ntfs_export_get_inode);
776 }
777
778 static struct dentry *ntfs_fh_to_parent(struct super_block *sb, struct fid *fid,
779 int fh_len, int fh_type)
780 {
781 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
782 ntfs_export_get_inode);
783 }
784
785 /* TODO: == ntfs_sync_inode */
786 static int ntfs_nfs_commit_metadata(struct inode *inode)
787 {
788 return _ni_write_inode(inode, 1);
789 }
790
791 static const struct export_operations ntfs_export_ops = {
792 .fh_to_dentry = ntfs_fh_to_dentry,
793 .fh_to_parent = ntfs_fh_to_parent,
794 .get_parent = ntfs3_get_parent,
795 .commit_metadata = ntfs_nfs_commit_metadata,
796 };
797
798 /*
799 * format_size_gb - Return Gb,Mb to print with "%u.%02u Gb".
800 */
801 static u32 format_size_gb(const u64 bytes, u32 *mb)
802 {
803 /* Do simple right 30 bit shift of 64 bit value. */
804 u64 kbytes = bytes >> 10;
805 u32 kbytes32 = kbytes;
806
807 *mb = (100 * (kbytes32 & 0xfffff) + 0x7ffff) >> 20;
808 if (*mb >= 100)
809 *mb = 99;
810
811 return (kbytes32 >> 20) | (((u32)(kbytes >> 32)) << 12);
812 }
813
814 static u32 true_sectors_per_clst(const struct NTFS_BOOT *boot)
815 {
816 if (boot->sectors_per_clusters <= 0x80)
817 return boot->sectors_per_clusters;
818 if (boot->sectors_per_clusters >= 0xf4) /* limit shift to 2MB max */
819 return 1U << (-(s8)boot->sectors_per_clusters);
820 return -EINVAL;
821 }
822
823 /*
824 * ntfs_init_from_boot - Init internal info from on-disk boot sector.
825 *
826 * NTFS mount begins from boot - special formatted 512 bytes.
827 * There are two boots: the first and the last 512 bytes of volume.
828 * The content of boot is not changed during ntfs life.
829 *
830 * NOTE: ntfs.sys checks only first (primary) boot.
831 * chkdsk checks both boots.
832 */
833 static int ntfs_init_from_boot(struct super_block *sb, u32 sector_size,
834 u64 dev_size, struct NTFS_BOOT **boot2)
835 {
836 struct ntfs_sb_info *sbi = sb->s_fs_info;
837 int err;
838 u32 mb, gb, boot_sector_size, sct_per_clst, record_size;
839 u64 sectors, clusters, mlcn, mlcn2;
840 struct NTFS_BOOT *boot;
841 struct buffer_head *bh;
842 struct MFT_REC *rec;
843 u16 fn, ao;
844 u8 cluster_bits;
845 u32 boot_off = 0;
846 const char *hint = "Primary boot";
847
848 sbi->volume.blocks = dev_size >> PAGE_SHIFT;
849
850 bh = ntfs_bread(sb, 0);
851 if (!bh)
852 return -EIO;
853
854 check_boot:
855 err = -EINVAL;
856 boot = (struct NTFS_BOOT *)Add2Ptr(bh->b_data, boot_off);
857
858 if (memcmp(boot->system_id, "NTFS ", sizeof("NTFS ") - 1)) {
859 ntfs_err(sb, "%s signature is not NTFS.", hint);
860 goto out;
861 }
862
863 /* 0x55AA is not mandaroty. Thanks Maxim Suhanov*/
864 /*if (0x55 != boot->boot_magic[0] || 0xAA != boot->boot_magic[1])
865 * goto out;
866 */
867
868 boot_sector_size = ((u32)boot->bytes_per_sector[1] << 8) |
869 boot->bytes_per_sector[0];
870 if (boot_sector_size < SECTOR_SIZE ||
871 !is_power_of_2(boot_sector_size)) {
872 ntfs_err(sb, "%s: invalid bytes per sector %u.", hint,
873 boot_sector_size);
874 goto out;
875 }
876
877 /* cluster size: 512, 1K, 2K, 4K, ... 2M */
878 sct_per_clst = true_sectors_per_clst(boot);
879 if ((int)sct_per_clst < 0 || !is_power_of_2(sct_per_clst)) {
880 ntfs_err(sb, "%s: invalid sectors per cluster %u.", hint,
881 sct_per_clst);
882 goto out;
883 }
884
885 sbi->cluster_size = boot_sector_size * sct_per_clst;
886 sbi->cluster_bits = cluster_bits = blksize_bits(sbi->cluster_size);
887 sbi->cluster_mask = sbi->cluster_size - 1;
888 sbi->cluster_mask_inv = ~(u64)sbi->cluster_mask;
889
890 mlcn = le64_to_cpu(boot->mft_clst);
891 mlcn2 = le64_to_cpu(boot->mft2_clst);
892 sectors = le64_to_cpu(boot->sectors_per_volume);
893
894 if (mlcn * sct_per_clst >= sectors || mlcn2 * sct_per_clst >= sectors) {
895 ntfs_err(
896 sb,
897 "%s: start of MFT 0x%llx (0x%llx) is out of volume 0x%llx.",
898 hint, mlcn, mlcn2, sectors);
899 goto out;
900 }
901
902 sbi->record_size = record_size =
903 boot->record_size < 0 ? 1 << (-boot->record_size) :
904 (u32)boot->record_size << cluster_bits;
905 sbi->record_bits = blksize_bits(record_size);
906 sbi->attr_size_tr = (5 * record_size >> 4); // ~320 bytes
907
908 /* Check MFT record size. */
909 if (record_size < SECTOR_SIZE || !is_power_of_2(record_size)) {
910 ntfs_err(sb, "%s: invalid bytes per MFT record %u (%d).", hint,
911 record_size, boot->record_size);
912 goto out;
913 }
914
915 if (record_size > MAXIMUM_BYTES_PER_MFT) {
916 ntfs_err(sb, "Unsupported bytes per MFT record %u.",
917 record_size);
918 goto out;
919 }
920
921 sbi->index_size = boot->index_size < 0 ?
922 1u << (-boot->index_size) :
923 (u32)boot->index_size << cluster_bits;
924
925 /* Check index record size. */
926 if (sbi->index_size < SECTOR_SIZE || !is_power_of_2(sbi->index_size)) {
927 ntfs_err(sb, "%s: invalid bytes per index %u(%d).", hint,
928 sbi->index_size, boot->index_size);
929 goto out;
930 }
931
932 if (sbi->index_size > MAXIMUM_BYTES_PER_INDEX) {
933 ntfs_err(sb, "%s: unsupported bytes per index %u.", hint,
934 sbi->index_size);
935 goto out;
936 }
937
938 sbi->volume.size = sectors * boot_sector_size;
939
940 gb = format_size_gb(sbi->volume.size + boot_sector_size, &mb);
941
942 /*
943 * - Volume formatted and mounted with the same sector size.
944 * - Volume formatted 4K and mounted as 512.
945 * - Volume formatted 512 and mounted as 4K.
946 */
947 if (boot_sector_size != sector_size) {
948 ntfs_warn(
949 sb,
950 "Different NTFS sector size (%u) and media sector size (%u).",
951 boot_sector_size, sector_size);
952 dev_size += sector_size - 1;
953 }
954
955 sbi->mft.lbo = mlcn << cluster_bits;
956 sbi->mft.lbo2 = mlcn2 << cluster_bits;
957
958 /* Compare boot's cluster and sector. */
959 if (sbi->cluster_size < boot_sector_size) {
960 ntfs_err(sb, "%s: invalid bytes per cluster (%u).", hint,
961 sbi->cluster_size);
962 goto out;
963 }
964
965 /* Compare boot's cluster and media sector. */
966 if (sbi->cluster_size < sector_size) {
967 /* No way to use ntfs_get_block in this case. */
968 ntfs_err(
969 sb,
970 "Failed to mount 'cause NTFS's cluster size (%u) is less than media sector size (%u).",
971 sbi->cluster_size, sector_size);
972 goto out;
973 }
974
975 sbi->max_bytes_per_attr =
976 record_size - ALIGN(MFTRECORD_FIXUP_OFFSET, 8) -
977 ALIGN(((record_size >> SECTOR_SHIFT) * sizeof(short)), 8) -
978 ALIGN(sizeof(enum ATTR_TYPE), 8);
979
980 sbi->volume.ser_num = le64_to_cpu(boot->serial_num);
981
982 /* Warning if RAW volume. */
983 if (dev_size < sbi->volume.size + boot_sector_size) {
984 u32 mb0, gb0;
985
986 gb0 = format_size_gb(dev_size, &mb0);
987 ntfs_warn(
988 sb,
989 "RAW NTFS volume: Filesystem size %u.%02u Gb > volume size %u.%02u Gb. Mount in read-only.",
990 gb, mb, gb0, mb0);
991 sb->s_flags |= SB_RDONLY;
992 }
993
994 clusters = sbi->volume.size >> cluster_bits;
995 #ifndef CONFIG_NTFS3_64BIT_CLUSTER
996 /* 32 bits per cluster. */
997 if (clusters >> 32) {
998 ntfs_notice(
999 sb,
1000 "NTFS %u.%02u Gb is too big to use 32 bits per cluster.",
1001 gb, mb);
1002 goto out;
1003 }
1004 #elif BITS_PER_LONG < 64
1005 #error "CONFIG_NTFS3_64BIT_CLUSTER incompatible in 32 bit OS"
1006 #endif
1007
1008 sbi->used.bitmap.nbits = clusters;
1009
1010 rec = kzalloc(record_size, GFP_NOFS);
1011 if (!rec) {
1012 err = -ENOMEM;
1013 goto out;
1014 }
1015
1016 sbi->new_rec = rec;
1017 rec->rhdr.sign = NTFS_FILE_SIGNATURE;
1018 rec->rhdr.fix_off = cpu_to_le16(MFTRECORD_FIXUP_OFFSET);
1019 fn = (sbi->record_size >> SECTOR_SHIFT) + 1;
1020 rec->rhdr.fix_num = cpu_to_le16(fn);
1021 ao = ALIGN(MFTRECORD_FIXUP_OFFSET + sizeof(short) * fn, 8);
1022 rec->attr_off = cpu_to_le16(ao);
1023 rec->used = cpu_to_le32(ao + ALIGN(sizeof(enum ATTR_TYPE), 8));
1024 rec->total = cpu_to_le32(sbi->record_size);
1025 ((struct ATTRIB *)Add2Ptr(rec, ao))->type = ATTR_END;
1026
1027 sb_set_blocksize(sb, min_t(u32, sbi->cluster_size, PAGE_SIZE));
1028
1029 sbi->block_mask = sb->s_blocksize - 1;
1030 sbi->blocks_per_cluster = sbi->cluster_size >> sb->s_blocksize_bits;
1031 sbi->volume.blocks = sbi->volume.size >> sb->s_blocksize_bits;
1032
1033 /* Maximum size for normal files. */
1034 sbi->maxbytes = (clusters << cluster_bits) - 1;
1035
1036 #ifdef CONFIG_NTFS3_64BIT_CLUSTER
1037 if (clusters >= (1ull << (64 - cluster_bits)))
1038 sbi->maxbytes = -1;
1039 sbi->maxbytes_sparse = -1;
1040 sb->s_maxbytes = MAX_LFS_FILESIZE;
1041 #else
1042 /* Maximum size for sparse file. */
1043 sbi->maxbytes_sparse = (1ull << (cluster_bits + 32)) - 1;
1044 sb->s_maxbytes = 0xFFFFFFFFull << cluster_bits;
1045 #endif
1046
1047 /*
1048 * Compute the MFT zone at two steps.
1049 * It would be nice if we are able to allocate 1/8 of
1050 * total clusters for MFT but not more then 512 MB.
1051 */
1052 sbi->zone_max = min_t(CLST, 0x20000000 >> cluster_bits, clusters >> 3);
1053
1054 err = 0;
1055
1056 if (bh->b_blocknr && !sb_rdonly(sb)) {
1057 /*
1058 * Alternative boot is ok but primary is not ok.
1059 * Do not update primary boot here 'cause it may be faked boot.
1060 * Let ntfs to be mounted and update boot later.
1061 */
1062 *boot2 = kmemdup(boot, sizeof(*boot), GFP_NOFS | __GFP_NOWARN);
1063 }
1064
1065 out:
1066 if (err == -EINVAL && !bh->b_blocknr && dev_size > PAGE_SHIFT) {
1067 u32 block_size = min_t(u32, sector_size, PAGE_SIZE);
1068 u64 lbo = dev_size - sizeof(*boot);
1069
1070 /*
1071 * Try alternative boot (last sector)
1072 */
1073 brelse(bh);
1074
1075 sb_set_blocksize(sb, block_size);
1076 bh = ntfs_bread(sb, lbo >> blksize_bits(block_size));
1077 if (!bh)
1078 return -EINVAL;
1079
1080 boot_off = lbo & (block_size - 1);
1081 hint = "Alternative boot";
1082 goto check_boot;
1083 }
1084 brelse(bh);
1085
1086 return err;
1087 }
1088
1089 /*
1090 * ntfs_fill_super - Try to mount.
1091 */
1092 static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
1093 {
1094 int err;
1095 struct ntfs_sb_info *sbi = sb->s_fs_info;
1096 struct block_device *bdev = sb->s_bdev;
1097 struct ntfs_mount_options *options;
1098 struct inode *inode;
1099 struct ntfs_inode *ni;
1100 size_t i, tt, bad_len, bad_frags;
1101 CLST vcn, lcn, len;
1102 struct ATTRIB *attr;
1103 const struct VOLUME_INFO *info;
1104 u32 idx, done, bytes;
1105 struct ATTR_DEF_ENTRY *t;
1106 u16 *shared;
1107 struct MFT_REF ref;
1108 bool ro = sb_rdonly(sb);
1109 struct NTFS_BOOT *boot2 = NULL;
1110
1111 ref.high = 0;
1112
1113 sbi->sb = sb;
1114 sbi->options = options = fc->fs_private;
1115 fc->fs_private = NULL;
1116 sb->s_flags |= SB_NODIRATIME;
1117 sb->s_magic = 0x7366746e; // "ntfs"
1118 sb->s_op = &ntfs_sops;
1119 sb->s_export_op = &ntfs_export_ops;
1120 sb->s_time_gran = NTFS_TIME_GRAN; // 100 nsec
1121 sb->s_xattr = ntfs_xattr_handlers;
1122 sb->s_d_op = options->nocase ? &ntfs_dentry_ops : NULL;
1123
1124 options->nls = ntfs_load_nls(options->nls_name);
1125 if (IS_ERR(options->nls)) {
1126 options->nls = NULL;
1127 errorf(fc, "Cannot load nls %s", options->nls_name);
1128 err = -EINVAL;
1129 goto out;
1130 }
1131
1132 if (bdev_max_discard_sectors(bdev) && bdev_discard_granularity(bdev)) {
1133 sbi->discard_granularity = bdev_discard_granularity(bdev);
1134 sbi->discard_granularity_mask_inv =
1135 ~(u64)(sbi->discard_granularity - 1);
1136 }
1137
1138 /* Parse boot. */
1139 err = ntfs_init_from_boot(sb, bdev_logical_block_size(bdev),
1140 bdev_nr_bytes(bdev), &boot2);
1141 if (err)
1142 goto out;
1143
1144 /*
1145 * Load $Volume. This should be done before $LogFile
1146 * 'cause 'sbi->volume.ni' is used 'ntfs_set_state'.
1147 */
1148 ref.low = cpu_to_le32(MFT_REC_VOL);
1149 ref.seq = cpu_to_le16(MFT_REC_VOL);
1150 inode = ntfs_iget5(sb, &ref, &NAME_VOLUME);
1151 if (IS_ERR(inode)) {
1152 err = PTR_ERR(inode);
1153 ntfs_err(sb, "Failed to load $Volume (%d).", err);
1154 goto out;
1155 }
1156
1157 ni = ntfs_i(inode);
1158
1159 /* Load and save label (not necessary). */
1160 attr = ni_find_attr(ni, NULL, NULL, ATTR_LABEL, NULL, 0, NULL, NULL);
1161
1162 if (!attr) {
1163 /* It is ok if no ATTR_LABEL */
1164 } else if (!attr->non_res && !is_attr_ext(attr)) {
1165 /* $AttrDef allows labels to be up to 128 symbols. */
1166 err = utf16s_to_utf8s(resident_data(attr),
1167 le32_to_cpu(attr->res.data_size) >> 1,
1168 UTF16_LITTLE_ENDIAN, sbi->volume.label,
1169 sizeof(sbi->volume.label));
1170 if (err < 0)
1171 sbi->volume.label[0] = 0;
1172 } else {
1173 /* Should we break mounting here? */
1174 //err = -EINVAL;
1175 //goto put_inode_out;
1176 }
1177
1178 attr = ni_find_attr(ni, attr, NULL, ATTR_VOL_INFO, NULL, 0, NULL, NULL);
1179 if (!attr || is_attr_ext(attr) ||
1180 !(info = resident_data_ex(attr, SIZEOF_ATTRIBUTE_VOLUME_INFO))) {
1181 ntfs_err(sb, "$Volume is corrupted.");
1182 err = -EINVAL;
1183 goto put_inode_out;
1184 }
1185
1186 sbi->volume.major_ver = info->major_ver;
1187 sbi->volume.minor_ver = info->minor_ver;
1188 sbi->volume.flags = info->flags;
1189 sbi->volume.ni = ni;
1190 if (info->flags & VOLUME_FLAG_DIRTY) {
1191 sbi->volume.real_dirty = true;
1192 ntfs_info(sb, "It is recommened to use chkdsk.");
1193 }
1194
1195 /* Load $MFTMirr to estimate recs_mirr. */
1196 ref.low = cpu_to_le32(MFT_REC_MIRR);
1197 ref.seq = cpu_to_le16(MFT_REC_MIRR);
1198 inode = ntfs_iget5(sb, &ref, &NAME_MIRROR);
1199 if (IS_ERR(inode)) {
1200 err = PTR_ERR(inode);
1201 ntfs_err(sb, "Failed to load $MFTMirr (%d).", err);
1202 goto out;
1203 }
1204
1205 sbi->mft.recs_mirr = ntfs_up_cluster(sbi, inode->i_size) >>
1206 sbi->record_bits;
1207
1208 iput(inode);
1209
1210 /* Load LogFile to replay. */
1211 ref.low = cpu_to_le32(MFT_REC_LOG);
1212 ref.seq = cpu_to_le16(MFT_REC_LOG);
1213 inode = ntfs_iget5(sb, &ref, &NAME_LOGFILE);
1214 if (IS_ERR(inode)) {
1215 err = PTR_ERR(inode);
1216 ntfs_err(sb, "Failed to load \x24LogFile (%d).", err);
1217 goto out;
1218 }
1219
1220 ni = ntfs_i(inode);
1221
1222 err = ntfs_loadlog_and_replay(ni, sbi);
1223 if (err)
1224 goto put_inode_out;
1225
1226 iput(inode);
1227
1228 if ((sbi->flags & NTFS_FLAGS_NEED_REPLAY) && !ro) {
1229 ntfs_warn(sb, "failed to replay log file. Can't mount rw!");
1230 err = -EINVAL;
1231 goto out;
1232 }
1233
1234 if ((sbi->volume.flags & VOLUME_FLAG_DIRTY) && !ro && !options->force) {
1235 ntfs_warn(sb, "volume is dirty and \"force\" flag is not set!");
1236 err = -EINVAL;
1237 goto out;
1238 }
1239
1240 /* Load $MFT. */
1241 ref.low = cpu_to_le32(MFT_REC_MFT);
1242 ref.seq = cpu_to_le16(1);
1243
1244 inode = ntfs_iget5(sb, &ref, &NAME_MFT);
1245 if (IS_ERR(inode)) {
1246 err = PTR_ERR(inode);
1247 ntfs_err(sb, "Failed to load $MFT (%d).", err);
1248 goto out;
1249 }
1250
1251 ni = ntfs_i(inode);
1252
1253 sbi->mft.used = ni->i_valid >> sbi->record_bits;
1254 tt = inode->i_size >> sbi->record_bits;
1255 sbi->mft.next_free = MFT_REC_USER;
1256
1257 err = wnd_init(&sbi->mft.bitmap, sb, tt);
1258 if (err)
1259 goto put_inode_out;
1260
1261 err = ni_load_all_mi(ni);
1262 if (err) {
1263 ntfs_err(sb, "Failed to load $MFT's subrecords (%d).", err);
1264 goto put_inode_out;
1265 }
1266
1267 sbi->mft.ni = ni;
1268
1269 /* Load $Bitmap. */
1270 ref.low = cpu_to_le32(MFT_REC_BITMAP);
1271 ref.seq = cpu_to_le16(MFT_REC_BITMAP);
1272 inode = ntfs_iget5(sb, &ref, &NAME_BITMAP);
1273 if (IS_ERR(inode)) {
1274 err = PTR_ERR(inode);
1275 ntfs_err(sb, "Failed to load $Bitmap (%d).", err);
1276 goto out;
1277 }
1278
1279 #ifndef CONFIG_NTFS3_64BIT_CLUSTER
1280 if (inode->i_size >> 32) {
1281 err = -EINVAL;
1282 goto put_inode_out;
1283 }
1284 #endif
1285
1286 /* Check bitmap boundary. */
1287 tt = sbi->used.bitmap.nbits;
1288 if (inode->i_size < bitmap_size(tt)) {
1289 ntfs_err(sb, "$Bitmap is corrupted.");
1290 err = -EINVAL;
1291 goto put_inode_out;
1292 }
1293
1294 err = wnd_init(&sbi->used.bitmap, sb, tt);
1295 if (err) {
1296 ntfs_err(sb, "Failed to initialize $Bitmap (%d).", err);
1297 goto put_inode_out;
1298 }
1299
1300 iput(inode);
1301
1302 /* Compute the MFT zone. */
1303 err = ntfs_refresh_zone(sbi);
1304 if (err) {
1305 ntfs_err(sb, "Failed to initialize MFT zone (%d).", err);
1306 goto out;
1307 }
1308
1309 /* Load $BadClus. */
1310 ref.low = cpu_to_le32(MFT_REC_BADCLUST);
1311 ref.seq = cpu_to_le16(MFT_REC_BADCLUST);
1312 inode = ntfs_iget5(sb, &ref, &NAME_BADCLUS);
1313 if (IS_ERR(inode)) {
1314 err = PTR_ERR(inode);
1315 ntfs_err(sb, "Failed to load $BadClus (%d).", err);
1316 goto out;
1317 }
1318
1319 ni = ntfs_i(inode);
1320 bad_len = bad_frags = 0;
1321 for (i = 0; run_get_entry(&ni->file.run, i, &vcn, &lcn, &len); i++) {
1322 if (lcn == SPARSE_LCN)
1323 continue;
1324
1325 bad_len += len;
1326 bad_frags += 1;
1327 if (ro)
1328 continue;
1329
1330 if (wnd_set_used_safe(&sbi->used.bitmap, lcn, len, &tt) || tt) {
1331 /* Bad blocks marked as free in bitmap. */
1332 ntfs_set_state(sbi, NTFS_DIRTY_ERROR);
1333 }
1334 }
1335 if (bad_len) {
1336 /*
1337 * Notice about bad blocks.
1338 * In normal cases these blocks are marked as used in bitmap.
1339 * And we never allocate space in it.
1340 */
1341 ntfs_notice(sb,
1342 "Volume contains %zu bad blocks in %zu fragments.",
1343 bad_len, bad_frags);
1344 }
1345 iput(inode);
1346
1347 /* Load $AttrDef. */
1348 ref.low = cpu_to_le32(MFT_REC_ATTR);
1349 ref.seq = cpu_to_le16(MFT_REC_ATTR);
1350 inode = ntfs_iget5(sb, &ref, &NAME_ATTRDEF);
1351 if (IS_ERR(inode)) {
1352 err = PTR_ERR(inode);
1353 ntfs_err(sb, "Failed to load $AttrDef (%d)", err);
1354 goto out;
1355 }
1356
1357 /*
1358 * Typical $AttrDef contains up to 20 entries.
1359 * Check for extremely large/small size.
1360 */
1361 if (inode->i_size < sizeof(struct ATTR_DEF_ENTRY) ||
1362 inode->i_size > 100 * sizeof(struct ATTR_DEF_ENTRY)) {
1363 ntfs_err(sb, "Looks like $AttrDef is corrupted (size=%llu).",
1364 inode->i_size);
1365 err = -EINVAL;
1366 goto put_inode_out;
1367 }
1368
1369 bytes = inode->i_size;
1370 sbi->def_table = t = kmalloc(bytes, GFP_NOFS | __GFP_NOWARN);
1371 if (!t) {
1372 err = -ENOMEM;
1373 goto put_inode_out;
1374 }
1375
1376 for (done = idx = 0; done < bytes; done += PAGE_SIZE, idx++) {
1377 unsigned long tail = bytes - done;
1378 struct page *page = ntfs_map_page(inode->i_mapping, idx);
1379
1380 if (IS_ERR(page)) {
1381 err = PTR_ERR(page);
1382 ntfs_err(sb, "Failed to read $AttrDef (%d).", err);
1383 goto put_inode_out;
1384 }
1385 memcpy(Add2Ptr(t, done), page_address(page),
1386 min(PAGE_SIZE, tail));
1387 ntfs_unmap_page(page);
1388
1389 if (!idx && ATTR_STD != t->type) {
1390 ntfs_err(sb, "$AttrDef is corrupted.");
1391 err = -EINVAL;
1392 goto put_inode_out;
1393 }
1394 }
1395
1396 t += 1;
1397 sbi->def_entries = 1;
1398 done = sizeof(struct ATTR_DEF_ENTRY);
1399 sbi->reparse.max_size = MAXIMUM_REPARSE_DATA_BUFFER_SIZE;
1400 sbi->ea_max_size = 0x10000; /* default formatter value */
1401
1402 while (done + sizeof(struct ATTR_DEF_ENTRY) <= bytes) {
1403 u32 t32 = le32_to_cpu(t->type);
1404 u64 sz = le64_to_cpu(t->max_sz);
1405
1406 if ((t32 & 0xF) || le32_to_cpu(t[-1].type) >= t32)
1407 break;
1408
1409 if (t->type == ATTR_REPARSE)
1410 sbi->reparse.max_size = sz;
1411 else if (t->type == ATTR_EA)
1412 sbi->ea_max_size = sz;
1413
1414 done += sizeof(struct ATTR_DEF_ENTRY);
1415 t += 1;
1416 sbi->def_entries += 1;
1417 }
1418 iput(inode);
1419
1420 /* Load $UpCase. */
1421 ref.low = cpu_to_le32(MFT_REC_UPCASE);
1422 ref.seq = cpu_to_le16(MFT_REC_UPCASE);
1423 inode = ntfs_iget5(sb, &ref, &NAME_UPCASE);
1424 if (IS_ERR(inode)) {
1425 err = PTR_ERR(inode);
1426 ntfs_err(sb, "Failed to load $UpCase (%d).", err);
1427 goto out;
1428 }
1429
1430 if (inode->i_size != 0x10000 * sizeof(short)) {
1431 err = -EINVAL;
1432 ntfs_err(sb, "$UpCase is corrupted.");
1433 goto put_inode_out;
1434 }
1435
1436 for (idx = 0; idx < (0x10000 * sizeof(short) >> PAGE_SHIFT); idx++) {
1437 const __le16 *src;
1438 u16 *dst = Add2Ptr(sbi->upcase, idx << PAGE_SHIFT);
1439 struct page *page = ntfs_map_page(inode->i_mapping, idx);
1440
1441 if (IS_ERR(page)) {
1442 err = PTR_ERR(page);
1443 ntfs_err(sb, "Failed to read $UpCase (%d).", err);
1444 goto put_inode_out;
1445 }
1446
1447 src = page_address(page);
1448
1449 #ifdef __BIG_ENDIAN
1450 for (i = 0; i < PAGE_SIZE / sizeof(u16); i++)
1451 *dst++ = le16_to_cpu(*src++);
1452 #else
1453 memcpy(dst, src, PAGE_SIZE);
1454 #endif
1455 ntfs_unmap_page(page);
1456 }
1457
1458 shared = ntfs_set_shared(sbi->upcase, 0x10000 * sizeof(short));
1459 if (shared && sbi->upcase != shared) {
1460 kvfree(sbi->upcase);
1461 sbi->upcase = shared;
1462 }
1463
1464 iput(inode);
1465
1466 if (is_ntfs3(sbi)) {
1467 /* Load $Secure. */
1468 err = ntfs_security_init(sbi);
1469 if (err) {
1470 ntfs_err(sb, "Failed to initialize $Secure (%d).", err);
1471 goto out;
1472 }
1473
1474 /* Load $Extend. */
1475 err = ntfs_extend_init(sbi);
1476 if (err) {
1477 ntfs_warn(sb, "Failed to initialize $Extend.");
1478 goto load_root;
1479 }
1480
1481 /* Load $Extend/$Reparse. */
1482 err = ntfs_reparse_init(sbi);
1483 if (err) {
1484 ntfs_warn(sb, "Failed to initialize $Extend/$Reparse.");
1485 goto load_root;
1486 }
1487
1488 /* Load $Extend/$ObjId. */
1489 err = ntfs_objid_init(sbi);
1490 if (err) {
1491 ntfs_warn(sb, "Failed to initialize $Extend/$ObjId.");
1492 goto load_root;
1493 }
1494 }
1495
1496 load_root:
1497 /* Load root. */
1498 ref.low = cpu_to_le32(MFT_REC_ROOT);
1499 ref.seq = cpu_to_le16(MFT_REC_ROOT);
1500 inode = ntfs_iget5(sb, &ref, &NAME_ROOT);
1501 if (IS_ERR(inode)) {
1502 err = PTR_ERR(inode);
1503 ntfs_err(sb, "Failed to load root (%d).", err);
1504 goto out;
1505 }
1506
1507 /*
1508 * Final check. Looks like this case should never occurs.
1509 */
1510 if (!inode->i_op) {
1511 err = -EINVAL;
1512 ntfs_err(sb, "Failed to load root (%d).", err);
1513 goto put_inode_out;
1514 }
1515
1516 sb->s_root = d_make_root(inode);
1517 if (!sb->s_root) {
1518 err = -ENOMEM;
1519 goto put_inode_out;
1520 }
1521
1522 if (boot2) {
1523 /*
1524 * Alternative boot is ok but primary is not ok.
1525 * Volume is recognized as NTFS. Update primary boot.
1526 */
1527 struct buffer_head *bh0 = sb_getblk(sb, 0);
1528 if (bh0) {
1529 if (buffer_locked(bh0))
1530 __wait_on_buffer(bh0);
1531
1532 lock_buffer(bh0);
1533 memcpy(bh0->b_data, boot2, sizeof(*boot2));
1534 set_buffer_uptodate(bh0);
1535 mark_buffer_dirty(bh0);
1536 unlock_buffer(bh0);
1537 if (!sync_dirty_buffer(bh0))
1538 ntfs_warn(sb, "primary boot is updated");
1539 put_bh(bh0);
1540 }
1541
1542 kfree(boot2);
1543 }
1544
1545 #ifdef CONFIG_PROC_FS
1546 /* Create /proc/fs/ntfs3/.. */
1547 if (proc_info_root) {
1548 struct proc_dir_entry *e = proc_mkdir(sb->s_id, proc_info_root);
1549 static_assert((S_IRUGO | S_IWUSR) == 0644);
1550 if (e) {
1551 proc_create_data("volinfo", S_IRUGO, e,
1552 &ntfs3_volinfo_fops, sb);
1553 proc_create_data("label", S_IRUGO | S_IWUSR, e,
1554 &ntfs3_label_fops, sb);
1555 sbi->procdir = e;
1556 }
1557 }
1558 #endif
1559
1560 return 0;
1561
1562 put_inode_out:
1563 iput(inode);
1564 out:
1565 kfree(boot2);
1566 return err;
1567 }
1568
1569 void ntfs_unmap_meta(struct super_block *sb, CLST lcn, CLST len)
1570 {
1571 struct ntfs_sb_info *sbi = sb->s_fs_info;
1572 struct block_device *bdev = sb->s_bdev;
1573 sector_t devblock = (u64)lcn * sbi->blocks_per_cluster;
1574 unsigned long blocks = (u64)len * sbi->blocks_per_cluster;
1575 unsigned long cnt = 0;
1576 unsigned long limit = global_zone_page_state(NR_FREE_PAGES)
1577 << (PAGE_SHIFT - sb->s_blocksize_bits);
1578
1579 if (limit >= 0x2000)
1580 limit -= 0x1000;
1581 else if (limit < 32)
1582 limit = 32;
1583 else
1584 limit >>= 1;
1585
1586 while (blocks--) {
1587 clean_bdev_aliases(bdev, devblock++, 1);
1588 if (cnt++ >= limit) {
1589 sync_blockdev(bdev);
1590 cnt = 0;
1591 }
1592 }
1593 }
1594
1595 /*
1596 * ntfs_discard - Issue a discard request (trim for SSD).
1597 */
1598 int ntfs_discard(struct ntfs_sb_info *sbi, CLST lcn, CLST len)
1599 {
1600 int err;
1601 u64 lbo, bytes, start, end;
1602 struct super_block *sb;
1603
1604 if (sbi->used.next_free_lcn == lcn + len)
1605 sbi->used.next_free_lcn = lcn;
1606
1607 if (sbi->flags & NTFS_FLAGS_NODISCARD)
1608 return -EOPNOTSUPP;
1609
1610 if (!sbi->options->discard)
1611 return -EOPNOTSUPP;
1612
1613 lbo = (u64)lcn << sbi->cluster_bits;
1614 bytes = (u64)len << sbi->cluster_bits;
1615
1616 /* Align up 'start' on discard_granularity. */
1617 start = (lbo + sbi->discard_granularity - 1) &
1618 sbi->discard_granularity_mask_inv;
1619 /* Align down 'end' on discard_granularity. */
1620 end = (lbo + bytes) & sbi->discard_granularity_mask_inv;
1621
1622 sb = sbi->sb;
1623 if (start >= end)
1624 return 0;
1625
1626 err = blkdev_issue_discard(sb->s_bdev, start >> 9, (end - start) >> 9,
1627 GFP_NOFS);
1628
1629 if (err == -EOPNOTSUPP)
1630 sbi->flags |= NTFS_FLAGS_NODISCARD;
1631
1632 return err;
1633 }
1634
1635 static int ntfs_fs_get_tree(struct fs_context *fc)
1636 {
1637 return get_tree_bdev(fc, ntfs_fill_super);
1638 }
1639
1640 /*
1641 * ntfs_fs_free - Free fs_context.
1642 *
1643 * Note that this will be called after fill_super and reconfigure
1644 * even when they pass. So they have to take pointers if they pass.
1645 */
1646 static void ntfs_fs_free(struct fs_context *fc)
1647 {
1648 struct ntfs_mount_options *opts = fc->fs_private;
1649 struct ntfs_sb_info *sbi = fc->s_fs_info;
1650
1651 if (sbi) {
1652 ntfs3_put_sbi(sbi);
1653 ntfs3_free_sbi(sbi);
1654 }
1655
1656 if (opts)
1657 put_mount_options(opts);
1658 }
1659
1660 // clang-format off
1661 static const struct fs_context_operations ntfs_context_ops = {
1662 .parse_param = ntfs_fs_parse_param,
1663 .get_tree = ntfs_fs_get_tree,
1664 .reconfigure = ntfs_fs_reconfigure,
1665 .free = ntfs_fs_free,
1666 };
1667 // clang-format on
1668
1669 /*
1670 * ntfs_init_fs_context - Initialize sbi and opts
1671 *
1672 * This will called when mount/remount. We will first initialize
1673 * options so that if remount we can use just that.
1674 */
1675 static int ntfs_init_fs_context(struct fs_context *fc)
1676 {
1677 struct ntfs_mount_options *opts;
1678 struct ntfs_sb_info *sbi;
1679
1680 opts = kzalloc(sizeof(struct ntfs_mount_options), GFP_NOFS);
1681 if (!opts)
1682 return -ENOMEM;
1683
1684 /* Default options. */
1685 opts->fs_uid = current_uid();
1686 opts->fs_gid = current_gid();
1687 opts->fs_fmask_inv = ~current_umask();
1688 opts->fs_dmask_inv = ~current_umask();
1689
1690 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE)
1691 goto ok;
1692
1693 sbi = kzalloc(sizeof(struct ntfs_sb_info), GFP_NOFS);
1694 if (!sbi)
1695 goto free_opts;
1696
1697 sbi->upcase = kvmalloc(0x10000 * sizeof(short), GFP_KERNEL);
1698 if (!sbi->upcase)
1699 goto free_sbi;
1700
1701 ratelimit_state_init(&sbi->msg_ratelimit, DEFAULT_RATELIMIT_INTERVAL,
1702 DEFAULT_RATELIMIT_BURST);
1703
1704 mutex_init(&sbi->compress.mtx_lznt);
1705 #ifdef CONFIG_NTFS3_LZX_XPRESS
1706 mutex_init(&sbi->compress.mtx_xpress);
1707 mutex_init(&sbi->compress.mtx_lzx);
1708 #endif
1709
1710 fc->s_fs_info = sbi;
1711 ok:
1712 fc->fs_private = opts;
1713 fc->ops = &ntfs_context_ops;
1714
1715 return 0;
1716 free_sbi:
1717 kfree(sbi);
1718 free_opts:
1719 kfree(opts);
1720 return -ENOMEM;
1721 }
1722
1723 static void ntfs3_kill_sb(struct super_block *sb)
1724 {
1725 struct ntfs_sb_info *sbi = sb->s_fs_info;
1726
1727 kill_block_super(sb);
1728
1729 if (sbi->options)
1730 put_mount_options(sbi->options);
1731 ntfs3_free_sbi(sbi);
1732 }
1733
1734 // clang-format off
1735 static struct file_system_type ntfs_fs_type = {
1736 .owner = THIS_MODULE,
1737 .name = "ntfs3",
1738 .init_fs_context = ntfs_init_fs_context,
1739 .parameters = ntfs_fs_parameters,
1740 .kill_sb = ntfs3_kill_sb,
1741 .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
1742 };
1743 // clang-format on
1744
1745 static int __init init_ntfs_fs(void)
1746 {
1747 int err;
1748
1749 pr_info("ntfs3: Max link count %u\n", NTFS_LINK_MAX);
1750
1751 if (IS_ENABLED(CONFIG_NTFS3_FS_POSIX_ACL))
1752 pr_info("ntfs3: Enabled Linux POSIX ACLs support\n");
1753 if (IS_ENABLED(CONFIG_NTFS3_64BIT_CLUSTER))
1754 pr_notice(
1755 "ntfs3: Warning: Activated 64 bits per cluster. Windows does not support this\n");
1756 if (IS_ENABLED(CONFIG_NTFS3_LZX_XPRESS))
1757 pr_info("ntfs3: Read-only LZX/Xpress compression included\n");
1758
1759
1760 #ifdef CONFIG_PROC_FS
1761 /* Create "/proc/fs/ntfs3" */
1762 proc_info_root = proc_mkdir("fs/ntfs3", NULL);
1763 #endif
1764
1765 err = ntfs3_init_bitmap();
1766 if (err)
1767 return err;
1768
1769 ntfs_inode_cachep = kmem_cache_create(
1770 "ntfs_inode_cache", sizeof(struct ntfs_inode), 0,
1771 (SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD | SLAB_ACCOUNT),
1772 init_once);
1773 if (!ntfs_inode_cachep) {
1774 err = -ENOMEM;
1775 goto out1;
1776 }
1777
1778 err = register_filesystem(&ntfs_fs_type);
1779 if (err)
1780 goto out;
1781
1782 return 0;
1783 out:
1784 kmem_cache_destroy(ntfs_inode_cachep);
1785 out1:
1786 ntfs3_exit_bitmap();
1787 return err;
1788 }
1789
1790 static void __exit exit_ntfs_fs(void)
1791 {
1792 rcu_barrier();
1793 kmem_cache_destroy(ntfs_inode_cachep);
1794 unregister_filesystem(&ntfs_fs_type);
1795 ntfs3_exit_bitmap();
1796
1797 #ifdef CONFIG_PROC_FS
1798 if (proc_info_root)
1799 remove_proc_entry("fs/ntfs3", NULL);
1800 #endif
1801
1802 }
1803
1804 MODULE_LICENSE("GPL");
1805 MODULE_DESCRIPTION("ntfs3 read/write filesystem");
1806 #ifdef CONFIG_NTFS3_FS_POSIX_ACL
1807 MODULE_INFO(behaviour, "Enabled Linux POSIX ACLs support");
1808 #endif
1809 #ifdef CONFIG_NTFS3_64BIT_CLUSTER
1810 MODULE_INFO(
1811 cluster,
1812 "Warning: Activated 64 bits per cluster. Windows does not support this");
1813 #endif
1814 #ifdef CONFIG_NTFS3_LZX_XPRESS
1815 MODULE_INFO(compression, "Read-only lzx/xpress compression included");
1816 #endif
1817
1818 MODULE_AUTHOR("Konstantin Komarov");
1819 MODULE_ALIAS_FS("ntfs3");
1820
1821 module_init(init_ntfs_fs);
1822 module_exit(exit_ntfs_fs);
Mirror https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git