xref: /openbmc/linux/fs/ntfs3/super.c (revision 4cfb9080)
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   * put_ntfs - Noinline to reduce binary size.
573   */
574  static noinline void put_ntfs(struct ntfs_sb_info *sbi)
575  {
576  	kfree(sbi->new_rec);
577  	kvfree(ntfs_put_shared(sbi->upcase));
578  	kfree(sbi->def_table);
579  
580  	wnd_close(&sbi->mft.bitmap);
581  	wnd_close(&sbi->used.bitmap);
582  
583  	if (sbi->mft.ni)
584  		iput(&sbi->mft.ni->vfs_inode);
585  
586  	if (sbi->security.ni)
587  		iput(&sbi->security.ni->vfs_inode);
588  
589  	if (sbi->reparse.ni)
590  		iput(&sbi->reparse.ni->vfs_inode);
591  
592  	if (sbi->objid.ni)
593  		iput(&sbi->objid.ni->vfs_inode);
594  
595  	if (sbi->volume.ni)
596  		iput(&sbi->volume.ni->vfs_inode);
597  
598  	ntfs_update_mftmirr(sbi, 0);
599  
600  	indx_clear(&sbi->security.index_sii);
601  	indx_clear(&sbi->security.index_sdh);
602  	indx_clear(&sbi->reparse.index_r);
603  	indx_clear(&sbi->objid.index_o);
604  	kfree(sbi->compress.lznt);
605  #ifdef CONFIG_NTFS3_LZX_XPRESS
606  	xpress_free_decompressor(sbi->compress.xpress);
607  	lzx_free_decompressor(sbi->compress.lzx);
608  #endif
609  	kfree(sbi);
610  }
611  
612  static void ntfs_put_super(struct super_block *sb)
613  {
614  	struct ntfs_sb_info *sbi = sb->s_fs_info;
615  
616  #ifdef CONFIG_PROC_FS
617  	// Remove /proc/fs/ntfs3/..
618  	if (sbi->procdir) {
619  		remove_proc_entry("label", sbi->procdir);
620  		remove_proc_entry("volinfo", sbi->procdir);
621  		remove_proc_entry(sb->s_id, proc_info_root);
622  		sbi->procdir = NULL;
623  	}
624  #endif
625  
626  	/* Mark rw ntfs as clear, if possible. */
627  	ntfs_set_state(sbi, NTFS_DIRTY_CLEAR);
628  
629  	put_mount_options(sbi->options);
630  	put_ntfs(sbi);
631  	sb->s_fs_info = NULL;
632  
633  	sync_blockdev(sb->s_bdev);
634  }
635  
636  static int ntfs_statfs(struct dentry *dentry, struct kstatfs *buf)
637  {
638  	struct super_block *sb = dentry->d_sb;
639  	struct ntfs_sb_info *sbi = sb->s_fs_info;
640  	struct wnd_bitmap *wnd = &sbi->used.bitmap;
641  
642  	buf->f_type = sb->s_magic;
643  	buf->f_bsize = sbi->cluster_size;
644  	buf->f_blocks = wnd->nbits;
645  
646  	buf->f_bfree = buf->f_bavail = wnd_zeroes(wnd);
647  	buf->f_fsid.val[0] = sbi->volume.ser_num;
648  	buf->f_fsid.val[1] = (sbi->volume.ser_num >> 32);
649  	buf->f_namelen = NTFS_NAME_LEN;
650  
651  	return 0;
652  }
653  
654  static int ntfs_show_options(struct seq_file *m, struct dentry *root)
655  {
656  	struct super_block *sb = root->d_sb;
657  	struct ntfs_sb_info *sbi = sb->s_fs_info;
658  	struct ntfs_mount_options *opts = sbi->options;
659  	struct user_namespace *user_ns = seq_user_ns(m);
660  
661  	seq_printf(m, ",uid=%u", from_kuid_munged(user_ns, opts->fs_uid));
662  	seq_printf(m, ",gid=%u", from_kgid_munged(user_ns, opts->fs_gid));
663  	if (opts->dmask)
664  		seq_printf(m, ",dmask=%04o", opts->fs_dmask_inv ^ 0xffff);
665  	if (opts->fmask)
666  		seq_printf(m, ",fmask=%04o", opts->fs_fmask_inv ^ 0xffff);
667  	if (opts->sys_immutable)
668  		seq_puts(m, ",sys_immutable");
669  	if (opts->discard)
670  		seq_puts(m, ",discard");
671  	if (opts->force)
672  		seq_puts(m, ",force");
673  	if (opts->sparse)
674  		seq_puts(m, ",sparse");
675  	if (opts->nohidden)
676  		seq_puts(m, ",nohidden");
677  	if (opts->hide_dot_files)
678  		seq_puts(m, ",hide_dot_files");
679  	if (opts->windows_names)
680  		seq_puts(m, ",windows_names");
681  	if (opts->showmeta)
682  		seq_puts(m, ",showmeta");
683  	if (sb->s_flags & SB_POSIXACL)
684  		seq_puts(m, ",acl");
685  	if (opts->nls)
686  		seq_printf(m, ",iocharset=%s", opts->nls->charset);
687  	else
688  		seq_puts(m, ",iocharset=utf8");
689  	if (opts->prealloc)
690  		seq_puts(m, ",prealloc");
691  	if (opts->nocase)
692  		seq_puts(m, ",nocase");
693  
694  	return 0;
695  }
696  
697  /*
698   * ntfs_sync_fs - super_operations::sync_fs
699   */
700  static int ntfs_sync_fs(struct super_block *sb, int wait)
701  {
702  	int err = 0, err2;
703  	struct ntfs_sb_info *sbi = sb->s_fs_info;
704  	struct ntfs_inode *ni;
705  	struct inode *inode;
706  
707  	ni = sbi->security.ni;
708  	if (ni) {
709  		inode = &ni->vfs_inode;
710  		err2 = _ni_write_inode(inode, wait);
711  		if (err2 && !err)
712  			err = err2;
713  	}
714  
715  	ni = sbi->objid.ni;
716  	if (ni) {
717  		inode = &ni->vfs_inode;
718  		err2 = _ni_write_inode(inode, wait);
719  		if (err2 && !err)
720  			err = err2;
721  	}
722  
723  	ni = sbi->reparse.ni;
724  	if (ni) {
725  		inode = &ni->vfs_inode;
726  		err2 = _ni_write_inode(inode, wait);
727  		if (err2 && !err)
728  			err = err2;
729  	}
730  
731  	if (!err)
732  		ntfs_set_state(sbi, NTFS_DIRTY_CLEAR);
733  
734  	ntfs_update_mftmirr(sbi, wait);
735  
736  	return err;
737  }
738  
739  static const struct super_operations ntfs_sops = {
740  	.alloc_inode = ntfs_alloc_inode,
741  	.free_inode = ntfs_free_inode,
742  	.evict_inode = ntfs_evict_inode,
743  	.put_super = ntfs_put_super,
744  	.statfs = ntfs_statfs,
745  	.show_options = ntfs_show_options,
746  	.sync_fs = ntfs_sync_fs,
747  	.write_inode = ntfs3_write_inode,
748  };
749  
750  static struct inode *ntfs_export_get_inode(struct super_block *sb, u64 ino,
751  					   u32 generation)
752  {
753  	struct MFT_REF ref;
754  	struct inode *inode;
755  
756  	ref.low = cpu_to_le32(ino);
757  #ifdef CONFIG_NTFS3_64BIT_CLUSTER
758  	ref.high = cpu_to_le16(ino >> 32);
759  #else
760  	ref.high = 0;
761  #endif
762  	ref.seq = cpu_to_le16(generation);
763  
764  	inode = ntfs_iget5(sb, &ref, NULL);
765  	if (!IS_ERR(inode) && is_bad_inode(inode)) {
766  		iput(inode);
767  		inode = ERR_PTR(-ESTALE);
768  	}
769  
770  	return inode;
771  }
772  
773  static struct dentry *ntfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
774  					int fh_len, int fh_type)
775  {
776  	return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
777  				    ntfs_export_get_inode);
778  }
779  
780  static struct dentry *ntfs_fh_to_parent(struct super_block *sb, struct fid *fid,
781  					int fh_len, int fh_type)
782  {
783  	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
784  				    ntfs_export_get_inode);
785  }
786  
787  /* TODO: == ntfs_sync_inode */
788  static int ntfs_nfs_commit_metadata(struct inode *inode)
789  {
790  	return _ni_write_inode(inode, 1);
791  }
792  
793  static const struct export_operations ntfs_export_ops = {
794  	.fh_to_dentry = ntfs_fh_to_dentry,
795  	.fh_to_parent = ntfs_fh_to_parent,
796  	.get_parent = ntfs3_get_parent,
797  	.commit_metadata = ntfs_nfs_commit_metadata,
798  };
799  
800  /*
801   * format_size_gb - Return Gb,Mb to print with "%u.%02u Gb".
802   */
803  static u32 format_size_gb(const u64 bytes, u32 *mb)
804  {
805  	/* Do simple right 30 bit shift of 64 bit value. */
806  	u64 kbytes = bytes >> 10;
807  	u32 kbytes32 = kbytes;
808  
809  	*mb = (100 * (kbytes32 & 0xfffff) + 0x7ffff) >> 20;
810  	if (*mb >= 100)
811  		*mb = 99;
812  
813  	return (kbytes32 >> 20) | (((u32)(kbytes >> 32)) << 12);
814  }
815  
816  static u32 true_sectors_per_clst(const struct NTFS_BOOT *boot)
817  {
818  	if (boot->sectors_per_clusters <= 0x80)
819  		return boot->sectors_per_clusters;
820  	if (boot->sectors_per_clusters >= 0xf4) /* limit shift to 2MB max */
821  		return 1U << (-(s8)boot->sectors_per_clusters);
822  	return -EINVAL;
823  }
824  
825  /*
826   * ntfs_init_from_boot - Init internal info from on-disk boot sector.
827   *
828   * NTFS mount begins from boot - special formatted 512 bytes.
829   * There are two boots: the first and the last 512 bytes of volume.
830   * The content of boot is not changed during ntfs life.
831   *
832   * NOTE: ntfs.sys checks only first (primary) boot.
833   * chkdsk checks both boots.
834   */
835  static int ntfs_init_from_boot(struct super_block *sb, u32 sector_size,
836  			       u64 dev_size, struct NTFS_BOOT **boot2)
837  {
838  	struct ntfs_sb_info *sbi = sb->s_fs_info;
839  	int err;
840  	u32 mb, gb, boot_sector_size, sct_per_clst, record_size;
841  	u64 sectors, clusters, mlcn, mlcn2;
842  	struct NTFS_BOOT *boot;
843  	struct buffer_head *bh;
844  	struct MFT_REC *rec;
845  	u16 fn, ao;
846  	u8 cluster_bits;
847  	u32 boot_off = 0;
848  	const char *hint = "Primary boot";
849  
850  	sbi->volume.blocks = dev_size >> PAGE_SHIFT;
851  
852  	bh = ntfs_bread(sb, 0);
853  	if (!bh)
854  		return -EIO;
855  
856  check_boot:
857  	err = -EINVAL;
858  	boot = (struct NTFS_BOOT *)Add2Ptr(bh->b_data, boot_off);
859  
860  	if (memcmp(boot->system_id, "NTFS    ", sizeof("NTFS    ") - 1)) {
861  		ntfs_err(sb, "%s signature is not NTFS.", hint);
862  		goto out;
863  	}
864  
865  	/* 0x55AA is not mandaroty. Thanks Maxim Suhanov*/
866  	/*if (0x55 != boot->boot_magic[0] || 0xAA != boot->boot_magic[1])
867  	 *	goto out;
868  	 */
869  
870  	boot_sector_size = ((u32)boot->bytes_per_sector[1] << 8) |
871  			   boot->bytes_per_sector[0];
872  	if (boot_sector_size < SECTOR_SIZE ||
873  	    !is_power_of_2(boot_sector_size)) {
874  		ntfs_err(sb, "%s: invalid bytes per sector %u.", hint,
875  			 boot_sector_size);
876  		goto out;
877  	}
878  
879  	/* cluster size: 512, 1K, 2K, 4K, ... 2M */
880  	sct_per_clst = true_sectors_per_clst(boot);
881  	if ((int)sct_per_clst < 0 || !is_power_of_2(sct_per_clst)) {
882  		ntfs_err(sb, "%s: invalid sectors per cluster %u.", hint,
883  			 sct_per_clst);
884  		goto out;
885  	}
886  
887  	sbi->cluster_size = boot_sector_size * sct_per_clst;
888  	sbi->cluster_bits = cluster_bits = blksize_bits(sbi->cluster_size);
889  	sbi->cluster_mask = sbi->cluster_size - 1;
890  	sbi->cluster_mask_inv = ~(u64)sbi->cluster_mask;
891  
892  	mlcn = le64_to_cpu(boot->mft_clst);
893  	mlcn2 = le64_to_cpu(boot->mft2_clst);
894  	sectors = le64_to_cpu(boot->sectors_per_volume);
895  
896  	if (mlcn * sct_per_clst >= sectors || mlcn2 * sct_per_clst >= sectors) {
897  		ntfs_err(
898  			sb,
899  			"%s: start of MFT 0x%llx (0x%llx) is out of volume 0x%llx.",
900  			hint, mlcn, mlcn2, sectors);
901  		goto out;
902  	}
903  
904  	sbi->record_size = record_size =
905  		boot->record_size < 0 ? 1 << (-boot->record_size) :
906  					(u32)boot->record_size << cluster_bits;
907  	sbi->record_bits = blksize_bits(record_size);
908  	sbi->attr_size_tr = (5 * record_size >> 4); // ~320 bytes
909  
910  	/* Check MFT record size. */
911  	if (record_size < SECTOR_SIZE || !is_power_of_2(record_size)) {
912  		ntfs_err(sb, "%s: invalid bytes per MFT record %u (%d).", hint,
913  			 record_size, boot->record_size);
914  		goto out;
915  	}
916  
917  	if (record_size > MAXIMUM_BYTES_PER_MFT) {
918  		ntfs_err(sb, "Unsupported bytes per MFT record %u.",
919  			 record_size);
920  		goto out;
921  	}
922  
923  	sbi->index_size = boot->index_size < 0 ?
924  				  1u << (-boot->index_size) :
925  				  (u32)boot->index_size << cluster_bits;
926  
927  	/* Check index record size. */
928  	if (sbi->index_size < SECTOR_SIZE || !is_power_of_2(sbi->index_size)) {
929  		ntfs_err(sb, "%s: invalid bytes per index %u(%d).", hint,
930  			 sbi->index_size, boot->index_size);
931  		goto out;
932  	}
933  
934  	if (sbi->index_size > MAXIMUM_BYTES_PER_INDEX) {
935  		ntfs_err(sb, "%s: unsupported bytes per index %u.", hint,
936  			 sbi->index_size);
937  		goto out;
938  	}
939  
940  	sbi->volume.size = sectors * boot_sector_size;
941  
942  	gb = format_size_gb(sbi->volume.size + boot_sector_size, &mb);
943  
944  	/*
945  	 * - Volume formatted and mounted with the same sector size.
946  	 * - Volume formatted 4K and mounted as 512.
947  	 * - Volume formatted 512 and mounted as 4K.
948  	 */
949  	if (boot_sector_size != sector_size) {
950  		ntfs_warn(
951  			sb,
952  			"Different NTFS sector size (%u) and media sector size (%u).",
953  			boot_sector_size, sector_size);
954  		dev_size += sector_size - 1;
955  	}
956  
957  	sbi->mft.lbo = mlcn << cluster_bits;
958  	sbi->mft.lbo2 = mlcn2 << cluster_bits;
959  
960  	/* Compare boot's cluster and sector. */
961  	if (sbi->cluster_size < boot_sector_size) {
962  		ntfs_err(sb, "%s: invalid bytes per cluster (%u).", hint,
963  			 sbi->cluster_size);
964  		goto out;
965  	}
966  
967  	/* Compare boot's cluster and media sector. */
968  	if (sbi->cluster_size < sector_size) {
969  		/* No way to use ntfs_get_block in this case. */
970  		ntfs_err(
971  			sb,
972  			"Failed to mount 'cause NTFS's cluster size (%u) is less than media sector size (%u).",
973  			sbi->cluster_size, sector_size);
974  		goto out;
975  	}
976  
977  	sbi->max_bytes_per_attr =
978  		record_size - ALIGN(MFTRECORD_FIXUP_OFFSET, 8) -
979  		ALIGN(((record_size >> SECTOR_SHIFT) * sizeof(short)), 8) -
980  		ALIGN(sizeof(enum ATTR_TYPE), 8);
981  
982  	sbi->volume.ser_num = le64_to_cpu(boot->serial_num);
983  
984  	/* Warning if RAW volume. */
985  	if (dev_size < sbi->volume.size + boot_sector_size) {
986  		u32 mb0, gb0;
987  
988  		gb0 = format_size_gb(dev_size, &mb0);
989  		ntfs_warn(
990  			sb,
991  			"RAW NTFS volume: Filesystem size %u.%02u Gb > volume size %u.%02u Gb. Mount in read-only.",
992  			gb, mb, gb0, mb0);
993  		sb->s_flags |= SB_RDONLY;
994  	}
995  
996  	clusters = sbi->volume.size >> cluster_bits;
997  #ifndef CONFIG_NTFS3_64BIT_CLUSTER
998  	/* 32 bits per cluster. */
999  	if (clusters >> 32) {
1000  		ntfs_notice(
1001  			sb,
1002  			"NTFS %u.%02u Gb is too big to use 32 bits per cluster.",
1003  			gb, mb);
1004  		goto out;
1005  	}
1006  #elif BITS_PER_LONG < 64
1007  #error "CONFIG_NTFS3_64BIT_CLUSTER incompatible in 32 bit OS"
1008  #endif
1009  
1010  	sbi->used.bitmap.nbits = clusters;
1011  
1012  	rec = kzalloc(record_size, GFP_NOFS);
1013  	if (!rec) {
1014  		err = -ENOMEM;
1015  		goto out;
1016  	}
1017  
1018  	sbi->new_rec = rec;
1019  	rec->rhdr.sign = NTFS_FILE_SIGNATURE;
1020  	rec->rhdr.fix_off = cpu_to_le16(MFTRECORD_FIXUP_OFFSET);
1021  	fn = (sbi->record_size >> SECTOR_SHIFT) + 1;
1022  	rec->rhdr.fix_num = cpu_to_le16(fn);
1023  	ao = ALIGN(MFTRECORD_FIXUP_OFFSET + sizeof(short) * fn, 8);
1024  	rec->attr_off = cpu_to_le16(ao);
1025  	rec->used = cpu_to_le32(ao + ALIGN(sizeof(enum ATTR_TYPE), 8));
1026  	rec->total = cpu_to_le32(sbi->record_size);
1027  	((struct ATTRIB *)Add2Ptr(rec, ao))->type = ATTR_END;
1028  
1029  	sb_set_blocksize(sb, min_t(u32, sbi->cluster_size, PAGE_SIZE));
1030  
1031  	sbi->block_mask = sb->s_blocksize - 1;
1032  	sbi->blocks_per_cluster = sbi->cluster_size >> sb->s_blocksize_bits;
1033  	sbi->volume.blocks = sbi->volume.size >> sb->s_blocksize_bits;
1034  
1035  	/* Maximum size for normal files. */
1036  	sbi->maxbytes = (clusters << cluster_bits) - 1;
1037  
1038  #ifdef CONFIG_NTFS3_64BIT_CLUSTER
1039  	if (clusters >= (1ull << (64 - cluster_bits)))
1040  		sbi->maxbytes = -1;
1041  	sbi->maxbytes_sparse = -1;
1042  	sb->s_maxbytes = MAX_LFS_FILESIZE;
1043  #else
1044  	/* Maximum size for sparse file. */
1045  	sbi->maxbytes_sparse = (1ull << (cluster_bits + 32)) - 1;
1046  	sb->s_maxbytes = 0xFFFFFFFFull << cluster_bits;
1047  #endif
1048  
1049  	/*
1050  	 * Compute the MFT zone at two steps.
1051  	 * It would be nice if we are able to allocate 1/8 of
1052  	 * total clusters for MFT but not more then 512 MB.
1053  	 */
1054  	sbi->zone_max = min_t(CLST, 0x20000000 >> cluster_bits, clusters >> 3);
1055  
1056  	err = 0;
1057  
1058  	if (bh->b_blocknr && !sb_rdonly(sb)) {
1059  		/*
1060  	     * Alternative boot is ok but primary is not ok.
1061  	     * Do not update primary boot here 'cause it may be faked boot.
1062  	     * Let ntfs to be mounted and update boot later.
1063  	     */
1064  		*boot2 = kmemdup(boot, sizeof(*boot), GFP_NOFS | __GFP_NOWARN);
1065  	}
1066  
1067  out:
1068  	if (err == -EINVAL && !bh->b_blocknr && dev_size > PAGE_SHIFT) {
1069  		u32 block_size = min_t(u32, sector_size, PAGE_SIZE);
1070  		u64 lbo = dev_size - sizeof(*boot);
1071  
1072  		/*
1073  	 	 * Try alternative boot (last sector)
1074  		 */
1075  		brelse(bh);
1076  
1077  		sb_set_blocksize(sb, block_size);
1078  		bh = ntfs_bread(sb, lbo >> blksize_bits(block_size));
1079  		if (!bh)
1080  			return -EINVAL;
1081  
1082  		boot_off = lbo & (block_size - 1);
1083  		hint = "Alternative boot";
1084  		goto check_boot;
1085  	}
1086  	brelse(bh);
1087  
1088  	return err;
1089  }
1090  
1091  /*
1092   * ntfs_fill_super - Try to mount.
1093   */
1094  static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
1095  {
1096  	int err;
1097  	struct ntfs_sb_info *sbi = sb->s_fs_info;
1098  	struct block_device *bdev = sb->s_bdev;
1099  	struct ntfs_mount_options *options;
1100  	struct inode *inode;
1101  	struct ntfs_inode *ni;
1102  	size_t i, tt, bad_len, bad_frags;
1103  	CLST vcn, lcn, len;
1104  	struct ATTRIB *attr;
1105  	const struct VOLUME_INFO *info;
1106  	u32 idx, done, bytes;
1107  	struct ATTR_DEF_ENTRY *t;
1108  	u16 *shared;
1109  	struct MFT_REF ref;
1110  	bool ro = sb_rdonly(sb);
1111  	struct NTFS_BOOT *boot2 = NULL;
1112  
1113  	ref.high = 0;
1114  
1115  	sbi->sb = sb;
1116  	sbi->options = options = fc->fs_private;
1117  	fc->fs_private = NULL;
1118  	sb->s_flags |= SB_NODIRATIME;
1119  	sb->s_magic = 0x7366746e; // "ntfs"
1120  	sb->s_op = &ntfs_sops;
1121  	sb->s_export_op = &ntfs_export_ops;
1122  	sb->s_time_gran = NTFS_TIME_GRAN; // 100 nsec
1123  	sb->s_xattr = ntfs_xattr_handlers;
1124  	sb->s_d_op = options->nocase ? &ntfs_dentry_ops : NULL;
1125  
1126  	options->nls = ntfs_load_nls(options->nls_name);
1127  	if (IS_ERR(options->nls)) {
1128  		options->nls = NULL;
1129  		errorf(fc, "Cannot load nls %s", options->nls_name);
1130  		err = -EINVAL;
1131  		goto out;
1132  	}
1133  
1134  	if (bdev_max_discard_sectors(bdev) && bdev_discard_granularity(bdev)) {
1135  		sbi->discard_granularity = bdev_discard_granularity(bdev);
1136  		sbi->discard_granularity_mask_inv =
1137  			~(u64)(sbi->discard_granularity - 1);
1138  	}
1139  
1140  	/* Parse boot. */
1141  	err = ntfs_init_from_boot(sb, bdev_logical_block_size(bdev),
1142  				  bdev_nr_bytes(bdev), &boot2);
1143  	if (err)
1144  		goto out;
1145  
1146  	/*
1147  	 * Load $Volume. This should be done before $LogFile
1148  	 * 'cause 'sbi->volume.ni' is used 'ntfs_set_state'.
1149  	 */
1150  	ref.low = cpu_to_le32(MFT_REC_VOL);
1151  	ref.seq = cpu_to_le16(MFT_REC_VOL);
1152  	inode = ntfs_iget5(sb, &ref, &NAME_VOLUME);
1153  	if (IS_ERR(inode)) {
1154  		err = PTR_ERR(inode);
1155  		ntfs_err(sb, "Failed to load $Volume (%d).", err);
1156  		goto out;
1157  	}
1158  
1159  	ni = ntfs_i(inode);
1160  
1161  	/* Load and save label (not necessary). */
1162  	attr = ni_find_attr(ni, NULL, NULL, ATTR_LABEL, NULL, 0, NULL, NULL);
1163  
1164  	if (!attr) {
1165  		/* It is ok if no ATTR_LABEL */
1166  	} else if (!attr->non_res && !is_attr_ext(attr)) {
1167  		/* $AttrDef allows labels to be up to 128 symbols. */
1168  		err = utf16s_to_utf8s(resident_data(attr),
1169  				      le32_to_cpu(attr->res.data_size) >> 1,
1170  				      UTF16_LITTLE_ENDIAN, sbi->volume.label,
1171  				      sizeof(sbi->volume.label));
1172  		if (err < 0)
1173  			sbi->volume.label[0] = 0;
1174  	} else {
1175  		/* Should we break mounting here? */
1176  		//err = -EINVAL;
1177  		//goto put_inode_out;
1178  	}
1179  
1180  	attr = ni_find_attr(ni, attr, NULL, ATTR_VOL_INFO, NULL, 0, NULL, NULL);
1181  	if (!attr || is_attr_ext(attr) ||
1182  	    !(info = resident_data_ex(attr, SIZEOF_ATTRIBUTE_VOLUME_INFO))) {
1183  		ntfs_err(sb, "$Volume is corrupted.");
1184  		err = -EINVAL;
1185  		goto put_inode_out;
1186  	}
1187  
1188  	sbi->volume.major_ver = info->major_ver;
1189  	sbi->volume.minor_ver = info->minor_ver;
1190  	sbi->volume.flags = info->flags;
1191  	sbi->volume.ni = ni;
1192  	if (info->flags & VOLUME_FLAG_DIRTY) {
1193  		sbi->volume.real_dirty = true;
1194  		ntfs_info(sb, "It is recommened to use chkdsk.");
1195  	}
1196  
1197  	/* Load $MFTMirr to estimate recs_mirr. */
1198  	ref.low = cpu_to_le32(MFT_REC_MIRR);
1199  	ref.seq = cpu_to_le16(MFT_REC_MIRR);
1200  	inode = ntfs_iget5(sb, &ref, &NAME_MIRROR);
1201  	if (IS_ERR(inode)) {
1202  		err = PTR_ERR(inode);
1203  		ntfs_err(sb, "Failed to load $MFTMirr (%d).", err);
1204  		goto out;
1205  	}
1206  
1207  	sbi->mft.recs_mirr = ntfs_up_cluster(sbi, inode->i_size) >>
1208  			     sbi->record_bits;
1209  
1210  	iput(inode);
1211  
1212  	/* Load LogFile to replay. */
1213  	ref.low = cpu_to_le32(MFT_REC_LOG);
1214  	ref.seq = cpu_to_le16(MFT_REC_LOG);
1215  	inode = ntfs_iget5(sb, &ref, &NAME_LOGFILE);
1216  	if (IS_ERR(inode)) {
1217  		err = PTR_ERR(inode);
1218  		ntfs_err(sb, "Failed to load \x24LogFile (%d).", err);
1219  		goto out;
1220  	}
1221  
1222  	ni = ntfs_i(inode);
1223  
1224  	err = ntfs_loadlog_and_replay(ni, sbi);
1225  	if (err)
1226  		goto put_inode_out;
1227  
1228  	iput(inode);
1229  
1230  	if ((sbi->flags & NTFS_FLAGS_NEED_REPLAY) && !ro) {
1231  		ntfs_warn(sb, "failed to replay log file. Can't mount rw!");
1232  		err = -EINVAL;
1233  		goto out;
1234  	}
1235  
1236  	if ((sbi->volume.flags & VOLUME_FLAG_DIRTY) && !ro && !options->force) {
1237  		ntfs_warn(sb, "volume is dirty and \"force\" flag is not set!");
1238  		err = -EINVAL;
1239  		goto out;
1240  	}
1241  
1242  	/* Load $MFT. */
1243  	ref.low = cpu_to_le32(MFT_REC_MFT);
1244  	ref.seq = cpu_to_le16(1);
1245  
1246  	inode = ntfs_iget5(sb, &ref, &NAME_MFT);
1247  	if (IS_ERR(inode)) {
1248  		err = PTR_ERR(inode);
1249  		ntfs_err(sb, "Failed to load $MFT (%d).", err);
1250  		goto out;
1251  	}
1252  
1253  	ni = ntfs_i(inode);
1254  
1255  	sbi->mft.used = ni->i_valid >> sbi->record_bits;
1256  	tt = inode->i_size >> sbi->record_bits;
1257  	sbi->mft.next_free = MFT_REC_USER;
1258  
1259  	err = wnd_init(&sbi->mft.bitmap, sb, tt);
1260  	if (err)
1261  		goto put_inode_out;
1262  
1263  	err = ni_load_all_mi(ni);
1264  	if (err) {
1265  		ntfs_err(sb, "Failed to load $MFT's subrecords (%d).", err);
1266  		goto put_inode_out;
1267  	}
1268  
1269  	sbi->mft.ni = ni;
1270  
1271  	/* Load $Bitmap. */
1272  	ref.low = cpu_to_le32(MFT_REC_BITMAP);
1273  	ref.seq = cpu_to_le16(MFT_REC_BITMAP);
1274  	inode = ntfs_iget5(sb, &ref, &NAME_BITMAP);
1275  	if (IS_ERR(inode)) {
1276  		err = PTR_ERR(inode);
1277  		ntfs_err(sb, "Failed to load $Bitmap (%d).", err);
1278  		goto out;
1279  	}
1280  
1281  #ifndef CONFIG_NTFS3_64BIT_CLUSTER
1282  	if (inode->i_size >> 32) {
1283  		err = -EINVAL;
1284  		goto put_inode_out;
1285  	}
1286  #endif
1287  
1288  	/* Check bitmap boundary. */
1289  	tt = sbi->used.bitmap.nbits;
1290  	if (inode->i_size < bitmap_size(tt)) {
1291  		ntfs_err(sb, "$Bitmap is corrupted.");
1292  		err = -EINVAL;
1293  		goto put_inode_out;
1294  	}
1295  
1296  	err = wnd_init(&sbi->used.bitmap, sb, tt);
1297  	if (err) {
1298  		ntfs_err(sb, "Failed to initialize $Bitmap (%d).", err);
1299  		goto put_inode_out;
1300  	}
1301  
1302  	iput(inode);
1303  
1304  	/* Compute the MFT zone. */
1305  	err = ntfs_refresh_zone(sbi);
1306  	if (err) {
1307  		ntfs_err(sb, "Failed to initialize MFT zone (%d).", err);
1308  		goto out;
1309  	}
1310  
1311  	/* Load $BadClus. */
1312  	ref.low = cpu_to_le32(MFT_REC_BADCLUST);
1313  	ref.seq = cpu_to_le16(MFT_REC_BADCLUST);
1314  	inode = ntfs_iget5(sb, &ref, &NAME_BADCLUS);
1315  	if (IS_ERR(inode)) {
1316  		err = PTR_ERR(inode);
1317  		ntfs_err(sb, "Failed to load $BadClus (%d).", err);
1318  		goto out;
1319  	}
1320  
1321  	ni = ntfs_i(inode);
1322  	bad_len = bad_frags = 0;
1323  	for (i = 0; run_get_entry(&ni->file.run, i, &vcn, &lcn, &len); i++) {
1324  		if (lcn == SPARSE_LCN)
1325  			continue;
1326  
1327  		bad_len += len;
1328  		bad_frags += 1;
1329  		if (ro)
1330  			continue;
1331  
1332  		if (wnd_set_used_safe(&sbi->used.bitmap, lcn, len, &tt) || tt) {
1333  			/* Bad blocks marked as free in bitmap. */
1334  			ntfs_set_state(sbi, NTFS_DIRTY_ERROR);
1335  		}
1336  	}
1337  	if (bad_len) {
1338  		/*
1339  		 * Notice about bad blocks.
1340  		 * In normal cases these blocks are marked as used in bitmap.
1341  		 * And we never allocate space in it.
1342  		 */
1343  		ntfs_notice(sb,
1344  			    "Volume contains %zu bad blocks in %zu fragments.",
1345  			    bad_len, bad_frags);
1346  	}
1347  	iput(inode);
1348  
1349  	/* Load $AttrDef. */
1350  	ref.low = cpu_to_le32(MFT_REC_ATTR);
1351  	ref.seq = cpu_to_le16(MFT_REC_ATTR);
1352  	inode = ntfs_iget5(sb, &ref, &NAME_ATTRDEF);
1353  	if (IS_ERR(inode)) {
1354  		err = PTR_ERR(inode);
1355  		ntfs_err(sb, "Failed to load $AttrDef (%d)", err);
1356  		goto out;
1357  	}
1358  
1359  	/*
1360  	 * Typical $AttrDef contains up to 20 entries.
1361  	 * Check for extremely large/small size.
1362  	 */
1363  	if (inode->i_size < sizeof(struct ATTR_DEF_ENTRY) ||
1364  	    inode->i_size > 100 * sizeof(struct ATTR_DEF_ENTRY)) {
1365  		ntfs_err(sb, "Looks like $AttrDef is corrupted (size=%llu).",
1366  			 inode->i_size);
1367  		err = -EINVAL;
1368  		goto put_inode_out;
1369  	}
1370  
1371  	bytes = inode->i_size;
1372  	sbi->def_table = t = kmalloc(bytes, GFP_NOFS | __GFP_NOWARN);
1373  	if (!t) {
1374  		err = -ENOMEM;
1375  		goto put_inode_out;
1376  	}
1377  
1378  	for (done = idx = 0; done < bytes; done += PAGE_SIZE, idx++) {
1379  		unsigned long tail = bytes - done;
1380  		struct page *page = ntfs_map_page(inode->i_mapping, idx);
1381  
1382  		if (IS_ERR(page)) {
1383  			err = PTR_ERR(page);
1384  			ntfs_err(sb, "Failed to read $AttrDef (%d).", err);
1385  			goto put_inode_out;
1386  		}
1387  		memcpy(Add2Ptr(t, done), page_address(page),
1388  		       min(PAGE_SIZE, tail));
1389  		ntfs_unmap_page(page);
1390  
1391  		if (!idx && ATTR_STD != t->type) {
1392  			ntfs_err(sb, "$AttrDef is corrupted.");
1393  			err = -EINVAL;
1394  			goto put_inode_out;
1395  		}
1396  	}
1397  
1398  	t += 1;
1399  	sbi->def_entries = 1;
1400  	done = sizeof(struct ATTR_DEF_ENTRY);
1401  	sbi->reparse.max_size = MAXIMUM_REPARSE_DATA_BUFFER_SIZE;
1402  	sbi->ea_max_size = 0x10000; /* default formatter value */
1403  
1404  	while (done + sizeof(struct ATTR_DEF_ENTRY) <= bytes) {
1405  		u32 t32 = le32_to_cpu(t->type);
1406  		u64 sz = le64_to_cpu(t->max_sz);
1407  
1408  		if ((t32 & 0xF) || le32_to_cpu(t[-1].type) >= t32)
1409  			break;
1410  
1411  		if (t->type == ATTR_REPARSE)
1412  			sbi->reparse.max_size = sz;
1413  		else if (t->type == ATTR_EA)
1414  			sbi->ea_max_size = sz;
1415  
1416  		done += sizeof(struct ATTR_DEF_ENTRY);
1417  		t += 1;
1418  		sbi->def_entries += 1;
1419  	}
1420  	iput(inode);
1421  
1422  	/* Load $UpCase. */
1423  	ref.low = cpu_to_le32(MFT_REC_UPCASE);
1424  	ref.seq = cpu_to_le16(MFT_REC_UPCASE);
1425  	inode = ntfs_iget5(sb, &ref, &NAME_UPCASE);
1426  	if (IS_ERR(inode)) {
1427  		err = PTR_ERR(inode);
1428  		ntfs_err(sb, "Failed to load $UpCase (%d).", err);
1429  		goto out;
1430  	}
1431  
1432  	if (inode->i_size != 0x10000 * sizeof(short)) {
1433  		err = -EINVAL;
1434  		ntfs_err(sb, "$UpCase is corrupted.");
1435  		goto put_inode_out;
1436  	}
1437  
1438  	for (idx = 0; idx < (0x10000 * sizeof(short) >> PAGE_SHIFT); idx++) {
1439  		const __le16 *src;
1440  		u16 *dst = Add2Ptr(sbi->upcase, idx << PAGE_SHIFT);
1441  		struct page *page = ntfs_map_page(inode->i_mapping, idx);
1442  
1443  		if (IS_ERR(page)) {
1444  			err = PTR_ERR(page);
1445  			ntfs_err(sb, "Failed to read $UpCase (%d).", err);
1446  			goto put_inode_out;
1447  		}
1448  
1449  		src = page_address(page);
1450  
1451  #ifdef __BIG_ENDIAN
1452  		for (i = 0; i < PAGE_SIZE / sizeof(u16); i++)
1453  			*dst++ = le16_to_cpu(*src++);
1454  #else
1455  		memcpy(dst, src, PAGE_SIZE);
1456  #endif
1457  		ntfs_unmap_page(page);
1458  	}
1459  
1460  	shared = ntfs_set_shared(sbi->upcase, 0x10000 * sizeof(short));
1461  	if (shared && sbi->upcase != shared) {
1462  		kvfree(sbi->upcase);
1463  		sbi->upcase = shared;
1464  	}
1465  
1466  	iput(inode);
1467  
1468  	if (is_ntfs3(sbi)) {
1469  		/* Load $Secure. */
1470  		err = ntfs_security_init(sbi);
1471  		if (err) {
1472  			ntfs_err(sb, "Failed to initialize $Secure (%d).", err);
1473  			goto out;
1474  		}
1475  
1476  		/* Load $Extend. */
1477  		err = ntfs_extend_init(sbi);
1478  		if (err) {
1479  			ntfs_warn(sb, "Failed to initialize $Extend.");
1480  			goto load_root;
1481  		}
1482  
1483  		/* Load $Extend/$Reparse. */
1484  		err = ntfs_reparse_init(sbi);
1485  		if (err) {
1486  			ntfs_warn(sb, "Failed to initialize $Extend/$Reparse.");
1487  			goto load_root;
1488  		}
1489  
1490  		/* Load $Extend/$ObjId. */
1491  		err = ntfs_objid_init(sbi);
1492  		if (err) {
1493  			ntfs_warn(sb, "Failed to initialize $Extend/$ObjId.");
1494  			goto load_root;
1495  		}
1496  	}
1497  
1498  load_root:
1499  	/* Load root. */
1500  	ref.low = cpu_to_le32(MFT_REC_ROOT);
1501  	ref.seq = cpu_to_le16(MFT_REC_ROOT);
1502  	inode = ntfs_iget5(sb, &ref, &NAME_ROOT);
1503  	if (IS_ERR(inode)) {
1504  		err = PTR_ERR(inode);
1505  		ntfs_err(sb, "Failed to load root (%d).", err);
1506  		goto out;
1507  	}
1508  
1509  	/*
1510  	 * Final check. Looks like this case should never occurs.
1511  	 */
1512  	if (!inode->i_op) {
1513  		err = -EINVAL;
1514  		ntfs_err(sb, "Failed to load root (%d).", err);
1515  		goto put_inode_out;
1516  	}
1517  
1518  	sb->s_root = d_make_root(inode);
1519  	if (!sb->s_root) {
1520  		err = -ENOMEM;
1521  		goto put_inode_out;
1522  	}
1523  
1524  	if (boot2) {
1525  		/*
1526  	     * Alternative boot is ok but primary is not ok.
1527  	     * Volume is recognized as NTFS. Update primary boot.
1528  	     */
1529  		struct buffer_head *bh0 = sb_getblk(sb, 0);
1530  		if (bh0) {
1531  			if (buffer_locked(bh0))
1532  				__wait_on_buffer(bh0);
1533  
1534  			lock_buffer(bh0);
1535  			memcpy(bh0->b_data, boot2, sizeof(*boot2));
1536  			set_buffer_uptodate(bh0);
1537  			mark_buffer_dirty(bh0);
1538  			unlock_buffer(bh0);
1539  			if (!sync_dirty_buffer(bh0))
1540  				ntfs_warn(sb, "primary boot is updated");
1541  			put_bh(bh0);
1542  		}
1543  
1544  		kfree(boot2);
1545  	}
1546  
1547  #ifdef CONFIG_PROC_FS
1548  	/* Create /proc/fs/ntfs3/.. */
1549  	if (proc_info_root) {
1550  		struct proc_dir_entry *e = proc_mkdir(sb->s_id, proc_info_root);
1551  		static_assert((S_IRUGO | S_IWUSR) == 0644);
1552  		if (e) {
1553  			proc_create_data("volinfo", S_IRUGO, e,
1554  					 &ntfs3_volinfo_fops, sb);
1555  			proc_create_data("label", S_IRUGO | S_IWUSR, e,
1556  					 &ntfs3_label_fops, sb);
1557  			sbi->procdir = e;
1558  		}
1559  	}
1560  #endif
1561  
1562  	return 0;
1563  
1564  put_inode_out:
1565  	iput(inode);
1566  out:
1567  	/*
1568  	 * Free resources here.
1569  	 * ntfs_fs_free will be called with fc->s_fs_info = NULL
1570  	 */
1571  	put_mount_options(sbi->options);
1572  	put_ntfs(sbi);
1573  	sb->s_fs_info = NULL;
1574  	kfree(boot2);
1575  
1576  	return err;
1577  }
1578  
1579  void ntfs_unmap_meta(struct super_block *sb, CLST lcn, CLST len)
1580  {
1581  	struct ntfs_sb_info *sbi = sb->s_fs_info;
1582  	struct block_device *bdev = sb->s_bdev;
1583  	sector_t devblock = (u64)lcn * sbi->blocks_per_cluster;
1584  	unsigned long blocks = (u64)len * sbi->blocks_per_cluster;
1585  	unsigned long cnt = 0;
1586  	unsigned long limit = global_zone_page_state(NR_FREE_PAGES)
1587  			      << (PAGE_SHIFT - sb->s_blocksize_bits);
1588  
1589  	if (limit >= 0x2000)
1590  		limit -= 0x1000;
1591  	else if (limit < 32)
1592  		limit = 32;
1593  	else
1594  		limit >>= 1;
1595  
1596  	while (blocks--) {
1597  		clean_bdev_aliases(bdev, devblock++, 1);
1598  		if (cnt++ >= limit) {
1599  			sync_blockdev(bdev);
1600  			cnt = 0;
1601  		}
1602  	}
1603  }
1604  
1605  /*
1606   * ntfs_discard - Issue a discard request (trim for SSD).
1607   */
1608  int ntfs_discard(struct ntfs_sb_info *sbi, CLST lcn, CLST len)
1609  {
1610  	int err;
1611  	u64 lbo, bytes, start, end;
1612  	struct super_block *sb;
1613  
1614  	if (sbi->used.next_free_lcn == lcn + len)
1615  		sbi->used.next_free_lcn = lcn;
1616  
1617  	if (sbi->flags & NTFS_FLAGS_NODISCARD)
1618  		return -EOPNOTSUPP;
1619  
1620  	if (!sbi->options->discard)
1621  		return -EOPNOTSUPP;
1622  
1623  	lbo = (u64)lcn << sbi->cluster_bits;
1624  	bytes = (u64)len << sbi->cluster_bits;
1625  
1626  	/* Align up 'start' on discard_granularity. */
1627  	start = (lbo + sbi->discard_granularity - 1) &
1628  		sbi->discard_granularity_mask_inv;
1629  	/* Align down 'end' on discard_granularity. */
1630  	end = (lbo + bytes) & sbi->discard_granularity_mask_inv;
1631  
1632  	sb = sbi->sb;
1633  	if (start >= end)
1634  		return 0;
1635  
1636  	err = blkdev_issue_discard(sb->s_bdev, start >> 9, (end - start) >> 9,
1637  				   GFP_NOFS);
1638  
1639  	if (err == -EOPNOTSUPP)
1640  		sbi->flags |= NTFS_FLAGS_NODISCARD;
1641  
1642  	return err;
1643  }
1644  
1645  static int ntfs_fs_get_tree(struct fs_context *fc)
1646  {
1647  	return get_tree_bdev(fc, ntfs_fill_super);
1648  }
1649  
1650  /*
1651   * ntfs_fs_free - Free fs_context.
1652   *
1653   * Note that this will be called after fill_super and reconfigure
1654   * even when they pass. So they have to take pointers if they pass.
1655   */
1656  static void ntfs_fs_free(struct fs_context *fc)
1657  {
1658  	struct ntfs_mount_options *opts = fc->fs_private;
1659  	struct ntfs_sb_info *sbi = fc->s_fs_info;
1660  
1661  	if (sbi)
1662  		put_ntfs(sbi);
1663  
1664  	if (opts)
1665  		put_mount_options(opts);
1666  }
1667  
1668  // clang-format off
1669  static const struct fs_context_operations ntfs_context_ops = {
1670  	.parse_param	= ntfs_fs_parse_param,
1671  	.get_tree	= ntfs_fs_get_tree,
1672  	.reconfigure	= ntfs_fs_reconfigure,
1673  	.free		= ntfs_fs_free,
1674  };
1675  // clang-format on
1676  
1677  /*
1678   * ntfs_init_fs_context - Initialize sbi and opts
1679   *
1680   * This will called when mount/remount. We will first initialize
1681   * options so that if remount we can use just that.
1682   */
1683  static int ntfs_init_fs_context(struct fs_context *fc)
1684  {
1685  	struct ntfs_mount_options *opts;
1686  	struct ntfs_sb_info *sbi;
1687  
1688  	opts = kzalloc(sizeof(struct ntfs_mount_options), GFP_NOFS);
1689  	if (!opts)
1690  		return -ENOMEM;
1691  
1692  	/* Default options. */
1693  	opts->fs_uid = current_uid();
1694  	opts->fs_gid = current_gid();
1695  	opts->fs_fmask_inv = ~current_umask();
1696  	opts->fs_dmask_inv = ~current_umask();
1697  
1698  	if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE)
1699  		goto ok;
1700  
1701  	sbi = kzalloc(sizeof(struct ntfs_sb_info), GFP_NOFS);
1702  	if (!sbi)
1703  		goto free_opts;
1704  
1705  	sbi->upcase = kvmalloc(0x10000 * sizeof(short), GFP_KERNEL);
1706  	if (!sbi->upcase)
1707  		goto free_sbi;
1708  
1709  	ratelimit_state_init(&sbi->msg_ratelimit, DEFAULT_RATELIMIT_INTERVAL,
1710  			     DEFAULT_RATELIMIT_BURST);
1711  
1712  	mutex_init(&sbi->compress.mtx_lznt);
1713  #ifdef CONFIG_NTFS3_LZX_XPRESS
1714  	mutex_init(&sbi->compress.mtx_xpress);
1715  	mutex_init(&sbi->compress.mtx_lzx);
1716  #endif
1717  
1718  	fc->s_fs_info = sbi;
1719  ok:
1720  	fc->fs_private = opts;
1721  	fc->ops = &ntfs_context_ops;
1722  
1723  	return 0;
1724  free_sbi:
1725  	kfree(sbi);
1726  free_opts:
1727  	kfree(opts);
1728  	return -ENOMEM;
1729  }
1730  
1731  // clang-format off
1732  static struct file_system_type ntfs_fs_type = {
1733  	.owner			= THIS_MODULE,
1734  	.name			= "ntfs3",
1735  	.init_fs_context	= ntfs_init_fs_context,
1736  	.parameters		= ntfs_fs_parameters,
1737  	.kill_sb		= kill_block_super,
1738  	.fs_flags		= FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
1739  };
1740  // clang-format on
1741  
1742  static int __init init_ntfs_fs(void)
1743  {
1744  	int err;
1745  
1746  	pr_info("ntfs3: Max link count %u\n", NTFS_LINK_MAX);
1747  
1748  	if (IS_ENABLED(CONFIG_NTFS3_FS_POSIX_ACL))
1749  		pr_info("ntfs3: Enabled Linux POSIX ACLs support\n");
1750  	if (IS_ENABLED(CONFIG_NTFS3_64BIT_CLUSTER))
1751  		pr_notice(
1752  			"ntfs3: Warning: Activated 64 bits per cluster. Windows does not support this\n");
1753  	if (IS_ENABLED(CONFIG_NTFS3_LZX_XPRESS))
1754  		pr_info("ntfs3: Read-only LZX/Xpress compression included\n");
1755  
1756  
1757  #ifdef CONFIG_PROC_FS
1758  	/* Create "/proc/fs/ntfs3" */
1759  	proc_info_root = proc_mkdir("fs/ntfs3", NULL);
1760  #endif
1761  
1762  	err = ntfs3_init_bitmap();
1763  	if (err)
1764  		return err;
1765  
1766  	ntfs_inode_cachep = kmem_cache_create(
1767  		"ntfs_inode_cache", sizeof(struct ntfs_inode), 0,
1768  		(SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD | SLAB_ACCOUNT),
1769  		init_once);
1770  	if (!ntfs_inode_cachep) {
1771  		err = -ENOMEM;
1772  		goto out1;
1773  	}
1774  
1775  	err = register_filesystem(&ntfs_fs_type);
1776  	if (err)
1777  		goto out;
1778  
1779  	return 0;
1780  out:
1781  	kmem_cache_destroy(ntfs_inode_cachep);
1782  out1:
1783  	ntfs3_exit_bitmap();
1784  	return err;
1785  }
1786  
1787  static void __exit exit_ntfs_fs(void)
1788  {
1789  	rcu_barrier();
1790  	kmem_cache_destroy(ntfs_inode_cachep);
1791  	unregister_filesystem(&ntfs_fs_type);
1792  	ntfs3_exit_bitmap();
1793  
1794  #ifdef CONFIG_PROC_FS
1795  	if (proc_info_root)
1796  		remove_proc_entry("fs/ntfs3", NULL);
1797  #endif
1798  
1799  }
1800  
1801  MODULE_LICENSE("GPL");
1802  MODULE_DESCRIPTION("ntfs3 read/write filesystem");
1803  #ifdef CONFIG_NTFS3_FS_POSIX_ACL
1804  MODULE_INFO(behaviour, "Enabled Linux POSIX ACLs support");
1805  #endif
1806  #ifdef CONFIG_NTFS3_64BIT_CLUSTER
1807  MODULE_INFO(
1808  	cluster,
1809  	"Warning: Activated 64 bits per cluster. Windows does not support this");
1810  #endif
1811  #ifdef CONFIG_NTFS3_LZX_XPRESS
1812  MODULE_INFO(compression, "Read-only lzx/xpress compression included");
1813  #endif
1814  
1815  MODULE_AUTHOR("Konstantin Komarov");
1816  MODULE_ALIAS_FS("ntfs3");
1817  
1818  module_init(init_ntfs_fs);
1819  module_exit(exit_ntfs_fs);
1820