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super.c
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1 /*
2  * super.c - NTFS kernel super block handling. Part of the Linux-NTFS project.
3  *
4  * Copyright (c) 2001-2012 Anton Altaparmakov and Tuxera Inc.
5  * Copyright (c) 2001,2002 Richard Russon
6  *
7  * This program/include file is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public License as published
9  * by the Free Software Foundation; either version 2 of the License, or
10  * (at your option) any later version.
11  *
12  * This program/include file is distributed in the hope that it will be
13  * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
14  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program (in the main directory of the Linux-NTFS
19  * distribution in the file COPYING); if not, write to the Free Software
20  * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21  */
22 
23 #include <linux/stddef.h>
24 #include <linux/init.h>
25 #include <linux/slab.h>
26 #include <linux/string.h>
27 #include <linux/spinlock.h>
28 #include <linux/blkdev.h> /* For bdev_logical_block_size(). */
29 #include <linux/backing-dev.h>
30 #include <linux/buffer_head.h>
31 #include <linux/vfs.h>
32 #include <linux/moduleparam.h>
33 #include <linux/bitmap.h>
34 
35 #include "sysctl.h"
36 #include "logfile.h"
37 #include "quota.h"
38 #include "usnjrnl.h"
39 #include "dir.h"
40 #include "debug.h"
41 #include "index.h"
42 #include "inode.h"
43 #include "aops.h"
44 #include "layout.h"
45 #include "malloc.h"
46 #include "ntfs.h"
47 
48 /* Number of mounted filesystems which have compression enabled. */
49 static unsigned long ntfs_nr_compression_users;
50 
51 /* A global default upcase table and a corresponding reference count. */
52 static ntfschar *default_upcase = NULL;
53 static unsigned long ntfs_nr_upcase_users = 0;
54 
55 /* Error constants/strings used in inode.c::ntfs_show_options(). */
56 typedef enum {
57  /* One of these must be present, default is ON_ERRORS_CONTINUE. */
58  ON_ERRORS_PANIC = 0x01,
59  ON_ERRORS_REMOUNT_RO = 0x02,
60  ON_ERRORS_CONTINUE = 0x04,
61  /* Optional, can be combined with any of the above. */
62  ON_ERRORS_RECOVER = 0x10,
63 } ON_ERRORS_ACTIONS;
64 
65 const option_t on_errors_arr[] = {
66  { ON_ERRORS_PANIC, "panic" },
67  { ON_ERRORS_REMOUNT_RO, "remount-ro", },
68  { ON_ERRORS_CONTINUE, "continue", },
69  { ON_ERRORS_RECOVER, "recover" },
70  { 0, NULL }
71 };
72 
78 static int simple_getbool(char *s, bool *setval)
79 {
80  if (s) {
81  if (!strcmp(s, "1") || !strcmp(s, "yes") || !strcmp(s, "true"))
82  *setval = true;
83  else if (!strcmp(s, "0") || !strcmp(s, "no") ||
84  !strcmp(s, "false"))
85  *setval = false;
86  else
87  return 0;
88  } else
89  *setval = true;
90  return 1;
91 }
92 
100 static bool parse_options(ntfs_volume *vol, char *opt)
101 {
102  char *p, *v, *ov;
103  static char *utf8 = "utf8";
104  int errors = 0, sloppy = 0;
105  kuid_t uid = INVALID_UID;
106  kgid_t gid = INVALID_GID;
107  umode_t fmask = (umode_t)-1, dmask = (umode_t)-1;
108  int mft_zone_multiplier = -1, on_errors = -1;
109  int show_sys_files = -1, case_sensitive = -1, disable_sparse = -1;
110  struct nls_table *nls_map = NULL, *old_nls;
111 
112  /* I am lazy... (-8 */
113 #define NTFS_GETOPT_WITH_DEFAULT(option, variable, default_value) \
114  if (!strcmp(p, option)) { \
115  if (!v || !*v) \
116  variable = default_value; \
117  else { \
118  variable = simple_strtoul(ov = v, &v, 0); \
119  if (*v) \
120  goto needs_val; \
121  } \
122  }
123 #define NTFS_GETOPT(option, variable) \
124  if (!strcmp(p, option)) { \
125  if (!v || !*v) \
126  goto needs_arg; \
127  variable = simple_strtoul(ov = v, &v, 0); \
128  if (*v) \
129  goto needs_val; \
130  }
131 #define NTFS_GETOPT_UID(option, variable) \
132  if (!strcmp(p, option)) { \
133  uid_t uid_value; \
134  if (!v || !*v) \
135  goto needs_arg; \
136  uid_value = simple_strtoul(ov = v, &v, 0); \
137  if (*v) \
138  goto needs_val; \
139  variable = make_kuid(current_user_ns(), uid_value); \
140  if (!uid_valid(variable)) \
141  goto needs_val; \
142  }
143 #define NTFS_GETOPT_GID(option, variable) \
144  if (!strcmp(p, option)) { \
145  gid_t gid_value; \
146  if (!v || !*v) \
147  goto needs_arg; \
148  gid_value = simple_strtoul(ov = v, &v, 0); \
149  if (*v) \
150  goto needs_val; \
151  variable = make_kgid(current_user_ns(), gid_value); \
152  if (!gid_valid(variable)) \
153  goto needs_val; \
154  }
155 #define NTFS_GETOPT_OCTAL(option, variable) \
156  if (!strcmp(p, option)) { \
157  if (!v || !*v) \
158  goto needs_arg; \
159  variable = simple_strtoul(ov = v, &v, 8); \
160  if (*v) \
161  goto needs_val; \
162  }
163 #define NTFS_GETOPT_BOOL(option, variable) \
164  if (!strcmp(p, option)) { \
165  bool val; \
166  if (!simple_getbool(v, &val)) \
167  goto needs_bool; \
168  variable = val; \
169  }
170 #define NTFS_GETOPT_OPTIONS_ARRAY(option, variable, opt_array) \
171  if (!strcmp(p, option)) { \
172  int _i; \
173  if (!v || !*v) \
174  goto needs_arg; \
175  ov = v; \
176  if (variable == -1) \
177  variable = 0; \
178  for (_i = 0; opt_array[_i].str && *opt_array[_i].str; _i++) \
179  if (!strcmp(opt_array[_i].str, v)) { \
180  variable |= opt_array[_i].val; \
181  break; \
182  } \
183  if (!opt_array[_i].str || !*opt_array[_i].str) \
184  goto needs_val; \
185  }
186  if (!opt || !*opt)
187  goto no_mount_options;
188  ntfs_debug("Entering with mount options string: %s", opt);
189  while ((p = strsep(&opt, ","))) {
190  if ((v = strchr(p, '=')))
191  *v++ = 0;
192  NTFS_GETOPT_UID("uid", uid)
193  else NTFS_GETOPT_GID("gid", gid)
194  else NTFS_GETOPT_OCTAL("umask", fmask = dmask)
195  else NTFS_GETOPT_OCTAL("fmask", fmask)
196  else NTFS_GETOPT_OCTAL("dmask", dmask)
197  else NTFS_GETOPT("mft_zone_multiplier", mft_zone_multiplier)
198  else NTFS_GETOPT_WITH_DEFAULT("sloppy", sloppy, true)
199  else NTFS_GETOPT_BOOL("show_sys_files", show_sys_files)
200  else NTFS_GETOPT_BOOL("case_sensitive", case_sensitive)
201  else NTFS_GETOPT_BOOL("disable_sparse", disable_sparse)
202  else NTFS_GETOPT_OPTIONS_ARRAY("errors", on_errors,
203  on_errors_arr)
204  else if (!strcmp(p, "posix") || !strcmp(p, "show_inodes"))
205  ntfs_warning(vol->sb, "Ignoring obsolete option %s.",
206  p);
207  else if (!strcmp(p, "nls") || !strcmp(p, "iocharset")) {
208  if (!strcmp(p, "iocharset"))
209  ntfs_warning(vol->sb, "Option iocharset is "
210  "deprecated. Please use "
211  "option nls=<charsetname> in "
212  "the future.");
213  if (!v || !*v)
214  goto needs_arg;
215 use_utf8:
216  old_nls = nls_map;
217  nls_map = load_nls(v);
218  if (!nls_map) {
219  if (!old_nls) {
220  ntfs_error(vol->sb, "NLS character set "
221  "%s not found.", v);
222  return false;
223  }
224  ntfs_error(vol->sb, "NLS character set %s not "
225  "found. Using previous one %s.",
226  v, old_nls->charset);
227  nls_map = old_nls;
228  } else /* nls_map */ {
229  unload_nls(old_nls);
230  }
231  } else if (!strcmp(p, "utf8")) {
232  bool val = false;
233  ntfs_warning(vol->sb, "Option utf8 is no longer "
234  "supported, using option nls=utf8. Please "
235  "use option nls=utf8 in the future and "
236  "make sure utf8 is compiled either as a "
237  "module or into the kernel.");
238  if (!v || !*v)
239  val = true;
240  else if (!simple_getbool(v, &val))
241  goto needs_bool;
242  if (val) {
243  v = utf8;
244  goto use_utf8;
245  }
246  } else {
247  ntfs_error(vol->sb, "Unrecognized mount option %s.", p);
248  if (errors < INT_MAX)
249  errors++;
250  }
251 #undef NTFS_GETOPT_OPTIONS_ARRAY
252 #undef NTFS_GETOPT_BOOL
253 #undef NTFS_GETOPT
254 #undef NTFS_GETOPT_WITH_DEFAULT
255  }
256 no_mount_options:
257  if (errors && !sloppy)
258  return false;
259  if (sloppy)
260  ntfs_warning(vol->sb, "Sloppy option given. Ignoring "
261  "unrecognized mount option(s) and continuing.");
262  /* Keep this first! */
263  if (on_errors != -1) {
264  if (!on_errors) {
265  ntfs_error(vol->sb, "Invalid errors option argument "
266  "or bug in options parser.");
267  return false;
268  }
269  }
270  if (nls_map) {
271  if (vol->nls_map && vol->nls_map != nls_map) {
272  ntfs_error(vol->sb, "Cannot change NLS character set "
273  "on remount.");
274  return false;
275  } /* else (!vol->nls_map) */
276  ntfs_debug("Using NLS character set %s.", nls_map->charset);
277  vol->nls_map = nls_map;
278  } else /* (!nls_map) */ {
279  if (!vol->nls_map) {
280  vol->nls_map = load_nls_default();
281  if (!vol->nls_map) {
282  ntfs_error(vol->sb, "Failed to load default "
283  "NLS character set.");
284  return false;
285  }
286  ntfs_debug("Using default NLS character set (%s).",
287  vol->nls_map->charset);
288  }
289  }
290  if (mft_zone_multiplier != -1) {
291  if (vol->mft_zone_multiplier && vol->mft_zone_multiplier !=
292  mft_zone_multiplier) {
293  ntfs_error(vol->sb, "Cannot change mft_zone_multiplier "
294  "on remount.");
295  return false;
296  }
297  if (mft_zone_multiplier < 1 || mft_zone_multiplier > 4) {
298  ntfs_error(vol->sb, "Invalid mft_zone_multiplier. "
299  "Using default value, i.e. 1.");
300  mft_zone_multiplier = 1;
301  }
302  vol->mft_zone_multiplier = mft_zone_multiplier;
303  }
304  if (!vol->mft_zone_multiplier)
305  vol->mft_zone_multiplier = 1;
306  if (on_errors != -1)
307  vol->on_errors = on_errors;
308  if (!vol->on_errors || vol->on_errors == ON_ERRORS_RECOVER)
309  vol->on_errors |= ON_ERRORS_CONTINUE;
310  if (uid_valid(uid))
311  vol->uid = uid;
312  if (gid_valid(gid))
313  vol->gid = gid;
314  if (fmask != (umode_t)-1)
315  vol->fmask = fmask;
316  if (dmask != (umode_t)-1)
317  vol->dmask = dmask;
318  if (show_sys_files != -1) {
319  if (show_sys_files)
320  NVolSetShowSystemFiles(vol);
321  else
322  NVolClearShowSystemFiles(vol);
323  }
324  if (case_sensitive != -1) {
325  if (case_sensitive)
326  NVolSetCaseSensitive(vol);
327  else
328  NVolClearCaseSensitive(vol);
329  }
330  if (disable_sparse != -1) {
331  if (disable_sparse)
332  NVolClearSparseEnabled(vol);
333  else {
334  if (!NVolSparseEnabled(vol) &&
335  vol->major_ver && vol->major_ver < 3)
336  ntfs_warning(vol->sb, "Not enabling sparse "
337  "support due to NTFS volume "
338  "version %i.%i (need at least "
339  "version 3.0).", vol->major_ver,
340  vol->minor_ver);
341  else
342  NVolSetSparseEnabled(vol);
343  }
344  }
345  return true;
346 needs_arg:
347  ntfs_error(vol->sb, "The %s option requires an argument.", p);
348  return false;
349 needs_bool:
350  ntfs_error(vol->sb, "The %s option requires a boolean argument.", p);
351  return false;
352 needs_val:
353  ntfs_error(vol->sb, "Invalid %s option argument: %s", p, ov);
354  return false;
355 }
356 
357 #ifdef NTFS_RW
358 
374 static int ntfs_write_volume_flags(ntfs_volume *vol, const VOLUME_FLAGS flags)
375 {
376  ntfs_inode *ni = NTFS_I(vol->vol_ino);
377  MFT_RECORD *m;
378  VOLUME_INFORMATION *vi;
379  ntfs_attr_search_ctx *ctx;
380  int err;
381 
382  ntfs_debug("Entering, old flags = 0x%x, new flags = 0x%x.",
383  le16_to_cpu(vol->vol_flags), le16_to_cpu(flags));
384  if (vol->vol_flags == flags)
385  goto done;
386  BUG_ON(!ni);
387  m = map_mft_record(ni);
388  if (IS_ERR(m)) {
389  err = PTR_ERR(m);
390  goto err_out;
391  }
392  ctx = ntfs_attr_get_search_ctx(ni, m);
393  if (!ctx) {
394  err = -ENOMEM;
395  goto put_unm_err_out;
396  }
397  err = ntfs_attr_lookup(AT_VOLUME_INFORMATION, NULL, 0, 0, 0, NULL, 0,
398  ctx);
399  if (err)
400  goto put_unm_err_out;
401  vi = (VOLUME_INFORMATION*)((u8*)ctx->attr +
402  le16_to_cpu(ctx->attr->data.resident.value_offset));
403  vol->vol_flags = vi->flags = flags;
404  flush_dcache_mft_record_page(ctx->ntfs_ino);
405  mark_mft_record_dirty(ctx->ntfs_ino);
406  ntfs_attr_put_search_ctx(ctx);
407  unmap_mft_record(ni);
408 done:
409  ntfs_debug("Done.");
410  return 0;
411 put_unm_err_out:
412  if (ctx)
413  ntfs_attr_put_search_ctx(ctx);
414  unmap_mft_record(ni);
415 err_out:
416  ntfs_error(vol->sb, "Failed with error code %i.", -err);
417  return err;
418 }
419 
429 static inline int ntfs_set_volume_flags(ntfs_volume *vol, VOLUME_FLAGS flags)
430 {
431  flags &= VOLUME_FLAGS_MASK;
432  return ntfs_write_volume_flags(vol, vol->vol_flags | flags);
433 }
434 
444 static inline int ntfs_clear_volume_flags(ntfs_volume *vol, VOLUME_FLAGS flags)
445 {
446  flags &= VOLUME_FLAGS_MASK;
447  flags = vol->vol_flags & cpu_to_le16(~le16_to_cpu(flags));
448  return ntfs_write_volume_flags(vol, flags);
449 }
450 
451 #endif /* NTFS_RW */
452 
465 static int ntfs_remount(struct super_block *sb, int *flags, char *opt)
466 {
467  ntfs_volume *vol = NTFS_SB(sb);
468 
469  ntfs_debug("Entering with remount options string: %s", opt);
470 
471 #ifndef NTFS_RW
472  /* For read-only compiled driver, enforce read-only flag. */
473  *flags |= MS_RDONLY;
474 #else /* NTFS_RW */
475  /*
476  * For the read-write compiled driver, if we are remounting read-write,
477  * make sure there are no volume errors and that no unsupported volume
478  * flags are set. Also, empty the logfile journal as it would become
479  * stale as soon as something is written to the volume and mark the
480  * volume dirty so that chkdsk is run if the volume is not umounted
481  * cleanly. Finally, mark the quotas out of date so Windows rescans
482  * the volume on boot and updates them.
483  *
484  * When remounting read-only, mark the volume clean if no volume errors
485  * have occurred.
486  */
487  if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
488  static const char *es = ". Cannot remount read-write.";
489 
490  /* Remounting read-write. */
491  if (NVolErrors(vol)) {
492  ntfs_error(sb, "Volume has errors and is read-only%s",
493  es);
494  return -EROFS;
495  }
496  if (vol->vol_flags & VOLUME_IS_DIRTY) {
497  ntfs_error(sb, "Volume is dirty and read-only%s", es);
498  return -EROFS;
499  }
500  if (vol->vol_flags & VOLUME_MODIFIED_BY_CHKDSK) {
501  ntfs_error(sb, "Volume has been modified by chkdsk "
502  "and is read-only%s", es);
503  return -EROFS;
504  }
505  if (vol->vol_flags & VOLUME_MUST_MOUNT_RO_MASK) {
506  ntfs_error(sb, "Volume has unsupported flags set "
507  "(0x%x) and is read-only%s",
508  (unsigned)le16_to_cpu(vol->vol_flags),
509  es);
510  return -EROFS;
511  }
512  if (ntfs_set_volume_flags(vol, VOLUME_IS_DIRTY)) {
513  ntfs_error(sb, "Failed to set dirty bit in volume "
514  "information flags%s", es);
515  return -EROFS;
516  }
517 #if 0
518  // TODO: Enable this code once we start modifying anything that
519  // is different between NTFS 1.2 and 3.x...
520  /* Set NT4 compatibility flag on newer NTFS version volumes. */
521  if ((vol->major_ver > 1)) {
522  if (ntfs_set_volume_flags(vol, VOLUME_MOUNTED_ON_NT4)) {
523  ntfs_error(sb, "Failed to set NT4 "
524  "compatibility flag%s", es);
525  NVolSetErrors(vol);
526  return -EROFS;
527  }
528  }
529 #endif
530  if (!ntfs_empty_logfile(vol->logfile_ino)) {
531  ntfs_error(sb, "Failed to empty journal $LogFile%s",
532  es);
533  NVolSetErrors(vol);
534  return -EROFS;
535  }
536  if (!ntfs_mark_quotas_out_of_date(vol)) {
537  ntfs_error(sb, "Failed to mark quotas out of date%s",
538  es);
539  NVolSetErrors(vol);
540  return -EROFS;
541  }
542  if (!ntfs_stamp_usnjrnl(vol)) {
543  ntfs_error(sb, "Failed to stamp transation log "
544  "($UsnJrnl)%s", es);
545  NVolSetErrors(vol);
546  return -EROFS;
547  }
548  } else if (!(sb->s_flags & MS_RDONLY) && (*flags & MS_RDONLY)) {
549  /* Remounting read-only. */
550  if (!NVolErrors(vol)) {
551  if (ntfs_clear_volume_flags(vol, VOLUME_IS_DIRTY))
552  ntfs_warning(sb, "Failed to clear dirty bit "
553  "in volume information "
554  "flags. Run chkdsk.");
555  }
556  }
557 #endif /* NTFS_RW */
558 
559  // TODO: Deal with *flags.
560 
561  if (!parse_options(vol, opt))
562  return -EINVAL;
563 
564  ntfs_debug("Done.");
565  return 0;
566 }
567 
580 static bool is_boot_sector_ntfs(const struct super_block *sb,
581  const NTFS_BOOT_SECTOR *b, const bool silent)
582 {
583  /*
584  * Check that checksum == sum of u32 values from b to the checksum
585  * field. If checksum is zero, no checking is done. We will work when
586  * the checksum test fails, since some utilities update the boot sector
587  * ignoring the checksum which leaves the checksum out-of-date. We
588  * report a warning if this is the case.
589  */
590  if ((void*)b < (void*)&b->checksum && b->checksum && !silent) {
591  le32 *u;
592  u32 i;
593 
594  for (i = 0, u = (le32*)b; u < (le32*)(&b->checksum); ++u)
595  i += le32_to_cpup(u);
596  if (le32_to_cpu(b->checksum) != i)
597  ntfs_warning(sb, "Invalid boot sector checksum.");
598  }
599  /* Check OEMidentifier is "NTFS " */
600  if (b->oem_id != magicNTFS)
601  goto not_ntfs;
602  /* Check bytes per sector value is between 256 and 4096. */
603  if (le16_to_cpu(b->bpb.bytes_per_sector) < 0x100 ||
604  le16_to_cpu(b->bpb.bytes_per_sector) > 0x1000)
605  goto not_ntfs;
606  /* Check sectors per cluster value is valid. */
607  switch (b->bpb.sectors_per_cluster) {
608  case 1: case 2: case 4: case 8: case 16: case 32: case 64: case 128:
609  break;
610  default:
611  goto not_ntfs;
612  }
613  /* Check the cluster size is not above the maximum (64kiB). */
614  if ((u32)le16_to_cpu(b->bpb.bytes_per_sector) *
615  b->bpb.sectors_per_cluster > NTFS_MAX_CLUSTER_SIZE)
616  goto not_ntfs;
617  /* Check reserved/unused fields are really zero. */
618  if (le16_to_cpu(b->bpb.reserved_sectors) ||
619  le16_to_cpu(b->bpb.root_entries) ||
620  le16_to_cpu(b->bpb.sectors) ||
621  le16_to_cpu(b->bpb.sectors_per_fat) ||
622  le32_to_cpu(b->bpb.large_sectors) || b->bpb.fats)
623  goto not_ntfs;
624  /* Check clusters per file mft record value is valid. */
625  if ((u8)b->clusters_per_mft_record < 0xe1 ||
626  (u8)b->clusters_per_mft_record > 0xf7)
627  switch (b->clusters_per_mft_record) {
628  case 1: case 2: case 4: case 8: case 16: case 32: case 64:
629  break;
630  default:
631  goto not_ntfs;
632  }
633  /* Check clusters per index block value is valid. */
634  if ((u8)b->clusters_per_index_record < 0xe1 ||
635  (u8)b->clusters_per_index_record > 0xf7)
636  switch (b->clusters_per_index_record) {
637  case 1: case 2: case 4: case 8: case 16: case 32: case 64:
638  break;
639  default:
640  goto not_ntfs;
641  }
642  /*
643  * Check for valid end of sector marker. We will work without it, but
644  * many BIOSes will refuse to boot from a bootsector if the magic is
645  * incorrect, so we emit a warning.
646  */
647  if (!silent && b->end_of_sector_marker != cpu_to_le16(0xaa55))
648  ntfs_warning(sb, "Invalid end of sector marker.");
649  return true;
650 not_ntfs:
651  return false;
652 }
653 
673 static struct buffer_head *read_ntfs_boot_sector(struct super_block *sb,
674  const int silent)
675 {
676  const char *read_err_str = "Unable to read %s boot sector.";
677  struct buffer_head *bh_primary, *bh_backup;
678  sector_t nr_blocks = NTFS_SB(sb)->nr_blocks;
679 
680  /* Try to read primary boot sector. */
681  if ((bh_primary = sb_bread(sb, 0))) {
682  if (is_boot_sector_ntfs(sb, (NTFS_BOOT_SECTOR*)
683  bh_primary->b_data, silent))
684  return bh_primary;
685  if (!silent)
686  ntfs_error(sb, "Primary boot sector is invalid.");
687  } else if (!silent)
688  ntfs_error(sb, read_err_str, "primary");
689  if (!(NTFS_SB(sb)->on_errors & ON_ERRORS_RECOVER)) {
690  if (bh_primary)
691  brelse(bh_primary);
692  if (!silent)
693  ntfs_error(sb, "Mount option errors=recover not used. "
694  "Aborting without trying to recover.");
695  return NULL;
696  }
697  /* Try to read NT4+ backup boot sector. */
698  if ((bh_backup = sb_bread(sb, nr_blocks - 1))) {
699  if (is_boot_sector_ntfs(sb, (NTFS_BOOT_SECTOR*)
700  bh_backup->b_data, silent))
701  goto hotfix_primary_boot_sector;
702  brelse(bh_backup);
703  } else if (!silent)
704  ntfs_error(sb, read_err_str, "backup");
705  /* Try to read NT3.51- backup boot sector. */
706  if ((bh_backup = sb_bread(sb, nr_blocks >> 1))) {
707  if (is_boot_sector_ntfs(sb, (NTFS_BOOT_SECTOR*)
708  bh_backup->b_data, silent))
709  goto hotfix_primary_boot_sector;
710  if (!silent)
711  ntfs_error(sb, "Could not find a valid backup boot "
712  "sector.");
713  brelse(bh_backup);
714  } else if (!silent)
715  ntfs_error(sb, read_err_str, "backup");
716  /* We failed. Cleanup and return. */
717  if (bh_primary)
718  brelse(bh_primary);
719  return NULL;
720 hotfix_primary_boot_sector:
721  if (bh_primary) {
722  /*
723  * If we managed to read sector zero and the volume is not
724  * read-only, copy the found, valid backup boot sector to the
725  * primary boot sector. Note we only copy the actual boot
726  * sector structure, not the actual whole device sector as that
727  * may be bigger and would potentially damage the $Boot system
728  * file (FIXME: Would be nice to know if the backup boot sector
729  * on a large sector device contains the whole boot loader or
730  * just the first 512 bytes).
731  */
732  if (!(sb->s_flags & MS_RDONLY)) {
733  ntfs_warning(sb, "Hot-fix: Recovering invalid primary "
734  "boot sector from backup copy.");
735  memcpy(bh_primary->b_data, bh_backup->b_data,
736  NTFS_BLOCK_SIZE);
737  mark_buffer_dirty(bh_primary);
738  sync_dirty_buffer(bh_primary);
739  if (buffer_uptodate(bh_primary)) {
740  brelse(bh_backup);
741  return bh_primary;
742  }
743  ntfs_error(sb, "Hot-fix: Device write error while "
744  "recovering primary boot sector.");
745  } else {
746  ntfs_warning(sb, "Hot-fix: Recovery of primary boot "
747  "sector failed: Read-only mount.");
748  }
749  brelse(bh_primary);
750  }
751  ntfs_warning(sb, "Using backup boot sector.");
752  return bh_backup;
753 }
754 
763 static bool parse_ntfs_boot_sector(ntfs_volume *vol, const NTFS_BOOT_SECTOR *b)
764 {
765  unsigned int sectors_per_cluster_bits, nr_hidden_sects;
766  int clusters_per_mft_record, clusters_per_index_record;
767  s64 ll;
768 
769  vol->sector_size = le16_to_cpu(b->bpb.bytes_per_sector);
770  vol->sector_size_bits = ffs(vol->sector_size) - 1;
771  ntfs_debug("vol->sector_size = %i (0x%x)", vol->sector_size,
772  vol->sector_size);
773  ntfs_debug("vol->sector_size_bits = %i (0x%x)", vol->sector_size_bits,
774  vol->sector_size_bits);
775  if (vol->sector_size < vol->sb->s_blocksize) {
776  ntfs_error(vol->sb, "Sector size (%i) is smaller than the "
777  "device block size (%lu). This is not "
778  "supported. Sorry.", vol->sector_size,
779  vol->sb->s_blocksize);
780  return false;
781  }
782  ntfs_debug("sectors_per_cluster = 0x%x", b->bpb.sectors_per_cluster);
783  sectors_per_cluster_bits = ffs(b->bpb.sectors_per_cluster) - 1;
784  ntfs_debug("sectors_per_cluster_bits = 0x%x",
785  sectors_per_cluster_bits);
786  nr_hidden_sects = le32_to_cpu(b->bpb.hidden_sectors);
787  ntfs_debug("number of hidden sectors = 0x%x", nr_hidden_sects);
788  vol->cluster_size = vol->sector_size << sectors_per_cluster_bits;
789  vol->cluster_size_mask = vol->cluster_size - 1;
790  vol->cluster_size_bits = ffs(vol->cluster_size) - 1;
791  ntfs_debug("vol->cluster_size = %i (0x%x)", vol->cluster_size,
792  vol->cluster_size);
793  ntfs_debug("vol->cluster_size_mask = 0x%x", vol->cluster_size_mask);
794  ntfs_debug("vol->cluster_size_bits = %i", vol->cluster_size_bits);
795  if (vol->cluster_size < vol->sector_size) {
796  ntfs_error(vol->sb, "Cluster size (%i) is smaller than the "
797  "sector size (%i). This is not supported. "
798  "Sorry.", vol->cluster_size, vol->sector_size);
799  return false;
800  }
801  clusters_per_mft_record = b->clusters_per_mft_record;
802  ntfs_debug("clusters_per_mft_record = %i (0x%x)",
803  clusters_per_mft_record, clusters_per_mft_record);
804  if (clusters_per_mft_record > 0)
805  vol->mft_record_size = vol->cluster_size <<
806  (ffs(clusters_per_mft_record) - 1);
807  else
808  /*
809  * When mft_record_size < cluster_size, clusters_per_mft_record
810  * = -log2(mft_record_size) bytes. mft_record_size normaly is
811  * 1024 bytes, which is encoded as 0xF6 (-10 in decimal).
812  */
813  vol->mft_record_size = 1 << -clusters_per_mft_record;
814  vol->mft_record_size_mask = vol->mft_record_size - 1;
815  vol->mft_record_size_bits = ffs(vol->mft_record_size) - 1;
816  ntfs_debug("vol->mft_record_size = %i (0x%x)", vol->mft_record_size,
817  vol->mft_record_size);
818  ntfs_debug("vol->mft_record_size_mask = 0x%x",
819  vol->mft_record_size_mask);
820  ntfs_debug("vol->mft_record_size_bits = %i (0x%x)",
821  vol->mft_record_size_bits, vol->mft_record_size_bits);
822  /*
823  * We cannot support mft record sizes above the PAGE_CACHE_SIZE since
824  * we store $MFT/$DATA, the table of mft records in the page cache.
825  */
826  if (vol->mft_record_size > PAGE_CACHE_SIZE) {
827  ntfs_error(vol->sb, "Mft record size (%i) exceeds the "
828  "PAGE_CACHE_SIZE on your system (%lu). "
829  "This is not supported. Sorry.",
830  vol->mft_record_size, PAGE_CACHE_SIZE);
831  return false;
832  }
833  /* We cannot support mft record sizes below the sector size. */
834  if (vol->mft_record_size < vol->sector_size) {
835  ntfs_error(vol->sb, "Mft record size (%i) is smaller than the "
836  "sector size (%i). This is not supported. "
837  "Sorry.", vol->mft_record_size,
838  vol->sector_size);
839  return false;
840  }
841  clusters_per_index_record = b->clusters_per_index_record;
842  ntfs_debug("clusters_per_index_record = %i (0x%x)",
843  clusters_per_index_record, clusters_per_index_record);
844  if (clusters_per_index_record > 0)
845  vol->index_record_size = vol->cluster_size <<
846  (ffs(clusters_per_index_record) - 1);
847  else
848  /*
849  * When index_record_size < cluster_size,
850  * clusters_per_index_record = -log2(index_record_size) bytes.
851  * index_record_size normaly equals 4096 bytes, which is
852  * encoded as 0xF4 (-12 in decimal).
853  */
854  vol->index_record_size = 1 << -clusters_per_index_record;
855  vol->index_record_size_mask = vol->index_record_size - 1;
856  vol->index_record_size_bits = ffs(vol->index_record_size) - 1;
857  ntfs_debug("vol->index_record_size = %i (0x%x)",
858  vol->index_record_size, vol->index_record_size);
859  ntfs_debug("vol->index_record_size_mask = 0x%x",
860  vol->index_record_size_mask);
861  ntfs_debug("vol->index_record_size_bits = %i (0x%x)",
862  vol->index_record_size_bits,
863  vol->index_record_size_bits);
864  /* We cannot support index record sizes below the sector size. */
865  if (vol->index_record_size < vol->sector_size) {
866  ntfs_error(vol->sb, "Index record size (%i) is smaller than "
867  "the sector size (%i). This is not "
868  "supported. Sorry.", vol->index_record_size,
869  vol->sector_size);
870  return false;
871  }
872  /*
873  * Get the size of the volume in clusters and check for 64-bit-ness.
874  * Windows currently only uses 32 bits to save the clusters so we do
875  * the same as it is much faster on 32-bit CPUs.
876  */
877  ll = sle64_to_cpu(b->number_of_sectors) >> sectors_per_cluster_bits;
878  if ((u64)ll >= 1ULL << 32) {
879  ntfs_error(vol->sb, "Cannot handle 64-bit clusters. Sorry.");
880  return false;
881  }
882  vol->nr_clusters = ll;
883  ntfs_debug("vol->nr_clusters = 0x%llx", (long long)vol->nr_clusters);
884  /*
885  * On an architecture where unsigned long is 32-bits, we restrict the
886  * volume size to 2TiB (2^41). On a 64-bit architecture, the compiler
887  * will hopefully optimize the whole check away.
888  */
889  if (sizeof(unsigned long) < 8) {
890  if ((ll << vol->cluster_size_bits) >= (1ULL << 41)) {
891  ntfs_error(vol->sb, "Volume size (%lluTiB) is too "
892  "large for this architecture. "
893  "Maximum supported is 2TiB. Sorry.",
894  (unsigned long long)ll >> (40 -
895  vol->cluster_size_bits));
896  return false;
897  }
898  }
899  ll = sle64_to_cpu(b->mft_lcn);
900  if (ll >= vol->nr_clusters) {
901  ntfs_error(vol->sb, "MFT LCN (%lli, 0x%llx) is beyond end of "
902  "volume. Weird.", (unsigned long long)ll,
903  (unsigned long long)ll);
904  return false;
905  }
906  vol->mft_lcn = ll;
907  ntfs_debug("vol->mft_lcn = 0x%llx", (long long)vol->mft_lcn);
908  ll = sle64_to_cpu(b->mftmirr_lcn);
909  if (ll >= vol->nr_clusters) {
910  ntfs_error(vol->sb, "MFTMirr LCN (%lli, 0x%llx) is beyond end "
911  "of volume. Weird.", (unsigned long long)ll,
912  (unsigned long long)ll);
913  return false;
914  }
915  vol->mftmirr_lcn = ll;
916  ntfs_debug("vol->mftmirr_lcn = 0x%llx", (long long)vol->mftmirr_lcn);
917 #ifdef NTFS_RW
918  /*
919  * Work out the size of the mft mirror in number of mft records. If the
920  * cluster size is less than or equal to the size taken by four mft
921  * records, the mft mirror stores the first four mft records. If the
922  * cluster size is bigger than the size taken by four mft records, the
923  * mft mirror contains as many mft records as will fit into one
924  * cluster.
925  */
926  if (vol->cluster_size <= (4 << vol->mft_record_size_bits))
927  vol->mftmirr_size = 4;
928  else
929  vol->mftmirr_size = vol->cluster_size >>
930  vol->mft_record_size_bits;
931  ntfs_debug("vol->mftmirr_size = %i", vol->mftmirr_size);
932 #endif /* NTFS_RW */
933  vol->serial_no = le64_to_cpu(b->volume_serial_number);
934  ntfs_debug("vol->serial_no = 0x%llx",
935  (unsigned long long)vol->serial_no);
936  return true;
937 }
938 
945 static void ntfs_setup_allocators(ntfs_volume *vol)
946 {
947 #ifdef NTFS_RW
948  LCN mft_zone_size, mft_lcn;
949 #endif /* NTFS_RW */
950 
951  ntfs_debug("vol->mft_zone_multiplier = 0x%x",
952  vol->mft_zone_multiplier);
953 #ifdef NTFS_RW
954  /* Determine the size of the MFT zone. */
955  mft_zone_size = vol->nr_clusters;
956  switch (vol->mft_zone_multiplier) { /* % of volume size in clusters */
957  case 4:
958  mft_zone_size >>= 1; /* 50% */
959  break;
960  case 3:
961  mft_zone_size = (mft_zone_size +
962  (mft_zone_size >> 1)) >> 2; /* 37.5% */
963  break;
964  case 2:
965  mft_zone_size >>= 2; /* 25% */
966  break;
967  /* case 1: */
968  default:
969  mft_zone_size >>= 3; /* 12.5% */
970  break;
971  }
972  /* Setup the mft zone. */
973  vol->mft_zone_start = vol->mft_zone_pos = vol->mft_lcn;
974  ntfs_debug("vol->mft_zone_pos = 0x%llx",
975  (unsigned long long)vol->mft_zone_pos);
976  /*
977  * Calculate the mft_lcn for an unmodified NTFS volume (see mkntfs
978  * source) and if the actual mft_lcn is in the expected place or even
979  * further to the front of the volume, extend the mft_zone to cover the
980  * beginning of the volume as well. This is in order to protect the
981  * area reserved for the mft bitmap as well within the mft_zone itself.
982  * On non-standard volumes we do not protect it as the overhead would
983  * be higher than the speed increase we would get by doing it.
984  */
985  mft_lcn = (8192 + 2 * vol->cluster_size - 1) / vol->cluster_size;
986  if (mft_lcn * vol->cluster_size < 16 * 1024)
987  mft_lcn = (16 * 1024 + vol->cluster_size - 1) /
988  vol->cluster_size;
989  if (vol->mft_zone_start <= mft_lcn)
990  vol->mft_zone_start = 0;
991  ntfs_debug("vol->mft_zone_start = 0x%llx",
992  (unsigned long long)vol->mft_zone_start);
993  /*
994  * Need to cap the mft zone on non-standard volumes so that it does
995  * not point outside the boundaries of the volume. We do this by
996  * halving the zone size until we are inside the volume.
997  */
998  vol->mft_zone_end = vol->mft_lcn + mft_zone_size;
999  while (vol->mft_zone_end >= vol->nr_clusters) {
1000  mft_zone_size >>= 1;
1001  vol->mft_zone_end = vol->mft_lcn + mft_zone_size;
1002  }
1003  ntfs_debug("vol->mft_zone_end = 0x%llx",
1004  (unsigned long long)vol->mft_zone_end);
1005  /*
1006  * Set the current position within each data zone to the start of the
1007  * respective zone.
1008  */
1009  vol->data1_zone_pos = vol->mft_zone_end;
1010  ntfs_debug("vol->data1_zone_pos = 0x%llx",
1011  (unsigned long long)vol->data1_zone_pos);
1012  vol->data2_zone_pos = 0;
1013  ntfs_debug("vol->data2_zone_pos = 0x%llx",
1014  (unsigned long long)vol->data2_zone_pos);
1015 
1016  /* Set the mft data allocation position to mft record 24. */
1017  vol->mft_data_pos = 24;
1018  ntfs_debug("vol->mft_data_pos = 0x%llx",
1019  (unsigned long long)vol->mft_data_pos);
1020 #endif /* NTFS_RW */
1021 }
1022 
1023 #ifdef NTFS_RW
1024 
1031 static bool load_and_init_mft_mirror(ntfs_volume *vol)
1032 {
1033  struct inode *tmp_ino;
1034  ntfs_inode *tmp_ni;
1035 
1036  ntfs_debug("Entering.");
1037  /* Get mft mirror inode. */
1038  tmp_ino = ntfs_iget(vol->sb, FILE_MFTMirr);
1039  if (IS_ERR(tmp_ino) || is_bad_inode(tmp_ino)) {
1040  if (!IS_ERR(tmp_ino))
1041  iput(tmp_ino);
1042  /* Caller will display error message. */
1043  return false;
1044  }
1045  /*
1046  * Re-initialize some specifics about $MFTMirr's inode as
1047  * ntfs_read_inode() will have set up the default ones.
1048  */
1049  /* Set uid and gid to root. */
1050  tmp_ino->i_uid = GLOBAL_ROOT_UID;
1051  tmp_ino->i_gid = GLOBAL_ROOT_GID;
1052  /* Regular file. No access for anyone. */
1053  tmp_ino->i_mode = S_IFREG;
1054  /* No VFS initiated operations allowed for $MFTMirr. */
1055  tmp_ino->i_op = &ntfs_empty_inode_ops;
1056  tmp_ino->i_fop = &ntfs_empty_file_ops;
1057  /* Put in our special address space operations. */
1058  tmp_ino->i_mapping->a_ops = &ntfs_mst_aops;
1059  tmp_ni = NTFS_I(tmp_ino);
1060  /* The $MFTMirr, like the $MFT is multi sector transfer protected. */
1061  NInoSetMstProtected(tmp_ni);
1062  NInoSetSparseDisabled(tmp_ni);
1063  /*
1064  * Set up our little cheat allowing us to reuse the async read io
1065  * completion handler for directories.
1066  */
1067  tmp_ni->itype.index.block_size = vol->mft_record_size;
1068  tmp_ni->itype.index.block_size_bits = vol->mft_record_size_bits;
1069  vol->mftmirr_ino = tmp_ino;
1070  ntfs_debug("Done.");
1071  return true;
1072 }
1073 
1084 static bool check_mft_mirror(ntfs_volume *vol)
1085 {
1086  struct super_block *sb = vol->sb;
1087  ntfs_inode *mirr_ni;
1088  struct page *mft_page, *mirr_page;
1089  u8 *kmft, *kmirr;
1090  runlist_element *rl, rl2[2];
1091  pgoff_t index;
1092  int mrecs_per_page, i;
1093 
1094  ntfs_debug("Entering.");
1095  /* Compare contents of $MFT and $MFTMirr. */
1096  mrecs_per_page = PAGE_CACHE_SIZE / vol->mft_record_size;
1097  BUG_ON(!mrecs_per_page);
1098  BUG_ON(!vol->mftmirr_size);
1099  mft_page = mirr_page = NULL;
1100  kmft = kmirr = NULL;
1101  index = i = 0;
1102  do {
1103  u32 bytes;
1104 
1105  /* Switch pages if necessary. */
1106  if (!(i % mrecs_per_page)) {
1107  if (index) {
1108  ntfs_unmap_page(mft_page);
1109  ntfs_unmap_page(mirr_page);
1110  }
1111  /* Get the $MFT page. */
1112  mft_page = ntfs_map_page(vol->mft_ino->i_mapping,
1113  index);
1114  if (IS_ERR(mft_page)) {
1115  ntfs_error(sb, "Failed to read $MFT.");
1116  return false;
1117  }
1118  kmft = page_address(mft_page);
1119  /* Get the $MFTMirr page. */
1120  mirr_page = ntfs_map_page(vol->mftmirr_ino->i_mapping,
1121  index);
1122  if (IS_ERR(mirr_page)) {
1123  ntfs_error(sb, "Failed to read $MFTMirr.");
1124  goto mft_unmap_out;
1125  }
1126  kmirr = page_address(mirr_page);
1127  ++index;
1128  }
1129  /* Do not check the record if it is not in use. */
1130  if (((MFT_RECORD*)kmft)->flags & MFT_RECORD_IN_USE) {
1131  /* Make sure the record is ok. */
1132  if (ntfs_is_baad_recordp((le32*)kmft)) {
1133  ntfs_error(sb, "Incomplete multi sector "
1134  "transfer detected in mft "
1135  "record %i.", i);
1136 mm_unmap_out:
1137  ntfs_unmap_page(mirr_page);
1138 mft_unmap_out:
1139  ntfs_unmap_page(mft_page);
1140  return false;
1141  }
1142  }
1143  /* Do not check the mirror record if it is not in use. */
1144  if (((MFT_RECORD*)kmirr)->flags & MFT_RECORD_IN_USE) {
1145  if (ntfs_is_baad_recordp((le32*)kmirr)) {
1146  ntfs_error(sb, "Incomplete multi sector "
1147  "transfer detected in mft "
1148  "mirror record %i.", i);
1149  goto mm_unmap_out;
1150  }
1151  }
1152  /* Get the amount of data in the current record. */
1153  bytes = le32_to_cpu(((MFT_RECORD*)kmft)->bytes_in_use);
1154  if (bytes < sizeof(MFT_RECORD_OLD) ||
1155  bytes > vol->mft_record_size ||
1156  ntfs_is_baad_recordp((le32*)kmft)) {
1157  bytes = le32_to_cpu(((MFT_RECORD*)kmirr)->bytes_in_use);
1158  if (bytes < sizeof(MFT_RECORD_OLD) ||
1159  bytes > vol->mft_record_size ||
1160  ntfs_is_baad_recordp((le32*)kmirr))
1161  bytes = vol->mft_record_size;
1162  }
1163  /* Compare the two records. */
1164  if (memcmp(kmft, kmirr, bytes)) {
1165  ntfs_error(sb, "$MFT and $MFTMirr (record %i) do not "
1166  "match. Run ntfsfix or chkdsk.", i);
1167  goto mm_unmap_out;
1168  }
1169  kmft += vol->mft_record_size;
1170  kmirr += vol->mft_record_size;
1171  } while (++i < vol->mftmirr_size);
1172  /* Release the last pages. */
1173  ntfs_unmap_page(mft_page);
1174  ntfs_unmap_page(mirr_page);
1175 
1176  /* Construct the mft mirror runlist by hand. */
1177  rl2[0].vcn = 0;
1178  rl2[0].lcn = vol->mftmirr_lcn;
1179  rl2[0].length = (vol->mftmirr_size * vol->mft_record_size +
1180  vol->cluster_size - 1) / vol->cluster_size;
1181  rl2[1].vcn = rl2[0].length;
1182  rl2[1].lcn = LCN_ENOENT;
1183  rl2[1].length = 0;
1184  /*
1185  * Because we have just read all of the mft mirror, we know we have
1186  * mapped the full runlist for it.
1187  */
1188  mirr_ni = NTFS_I(vol->mftmirr_ino);
1189  down_read(&mirr_ni->runlist.lock);
1190  rl = mirr_ni->runlist.rl;
1191  /* Compare the two runlists. They must be identical. */
1192  i = 0;
1193  do {
1194  if (rl2[i].vcn != rl[i].vcn || rl2[i].lcn != rl[i].lcn ||
1195  rl2[i].length != rl[i].length) {
1196  ntfs_error(sb, "$MFTMirr location mismatch. "
1197  "Run chkdsk.");
1198  up_read(&mirr_ni->runlist.lock);
1199  return false;
1200  }
1201  } while (rl2[i++].length);
1202  up_read(&mirr_ni->runlist.lock);
1203  ntfs_debug("Done.");
1204  return true;
1205 }
1206 
1213 static bool load_and_check_logfile(ntfs_volume *vol,
1214  RESTART_PAGE_HEADER **rp)
1215 {
1216  struct inode *tmp_ino;
1217 
1218  ntfs_debug("Entering.");
1219  tmp_ino = ntfs_iget(vol->sb, FILE_LogFile);
1220  if (IS_ERR(tmp_ino) || is_bad_inode(tmp_ino)) {
1221  if (!IS_ERR(tmp_ino))
1222  iput(tmp_ino);
1223  /* Caller will display error message. */
1224  return false;
1225  }
1226  if (!ntfs_check_logfile(tmp_ino, rp)) {
1227  iput(tmp_ino);
1228  /* ntfs_check_logfile() will have displayed error output. */
1229  return false;
1230  }
1231  NInoSetSparseDisabled(NTFS_I(tmp_ino));
1232  vol->logfile_ino = tmp_ino;
1233  ntfs_debug("Done.");
1234  return true;
1235 }
1236 
1237 #define NTFS_HIBERFIL_HEADER_SIZE 4096
1238 
1263 static int check_windows_hibernation_status(ntfs_volume *vol)
1264 {
1265  MFT_REF mref;
1266  struct inode *vi;
1267  struct page *page;
1268  u32 *kaddr, *kend;
1269  ntfs_name *name = NULL;
1270  int ret = 1;
1271  static const ntfschar hiberfil[13] = { cpu_to_le16('h'),
1272  cpu_to_le16('i'), cpu_to_le16('b'),
1273  cpu_to_le16('e'), cpu_to_le16('r'),
1274  cpu_to_le16('f'), cpu_to_le16('i'),
1275  cpu_to_le16('l'), cpu_to_le16('.'),
1276  cpu_to_le16('s'), cpu_to_le16('y'),
1277  cpu_to_le16('s'), 0 };
1278 
1279  ntfs_debug("Entering.");
1280  /*
1281  * Find the inode number for the hibernation file by looking up the
1282  * filename hiberfil.sys in the root directory.
1283  */
1284  mutex_lock(&vol->root_ino->i_mutex);
1285  mref = ntfs_lookup_inode_by_name(NTFS_I(vol->root_ino), hiberfil, 12,
1286  &name);
1287  mutex_unlock(&vol->root_ino->i_mutex);
1288  if (IS_ERR_MREF(mref)) {
1289  ret = MREF_ERR(mref);
1290  /* If the file does not exist, Windows is not hibernated. */
1291  if (ret == -ENOENT) {
1292  ntfs_debug("hiberfil.sys not present. Windows is not "
1293  "hibernated on the volume.");
1294  return 0;
1295  }
1296  /* A real error occurred. */
1297  ntfs_error(vol->sb, "Failed to find inode number for "
1298  "hiberfil.sys.");
1299  return ret;
1300  }
1301  /* We do not care for the type of match that was found. */
1302  kfree(name);
1303  /* Get the inode. */
1304  vi = ntfs_iget(vol->sb, MREF(mref));
1305  if (IS_ERR(vi) || is_bad_inode(vi)) {
1306  if (!IS_ERR(vi))
1307  iput(vi);
1308  ntfs_error(vol->sb, "Failed to load hiberfil.sys.");
1309  return IS_ERR(vi) ? PTR_ERR(vi) : -EIO;
1310  }
1311  if (unlikely(i_size_read(vi) < NTFS_HIBERFIL_HEADER_SIZE)) {
1312  ntfs_debug("hiberfil.sys is smaller than 4kiB (0x%llx). "
1313  "Windows is hibernated on the volume. This "
1314  "is not the system volume.", i_size_read(vi));
1315  goto iput_out;
1316  }
1317  page = ntfs_map_page(vi->i_mapping, 0);
1318  if (IS_ERR(page)) {
1319  ntfs_error(vol->sb, "Failed to read from hiberfil.sys.");
1320  ret = PTR_ERR(page);
1321  goto iput_out;
1322  }
1323  kaddr = (u32*)page_address(page);
1324  if (*(le32*)kaddr == cpu_to_le32(0x72626968)/*'hibr'*/) {
1325  ntfs_debug("Magic \"hibr\" found in hiberfil.sys. Windows is "
1326  "hibernated on the volume. This is the "
1327  "system volume.");
1328  goto unm_iput_out;
1329  }
1330  kend = kaddr + NTFS_HIBERFIL_HEADER_SIZE/sizeof(*kaddr);
1331  do {
1332  if (unlikely(*kaddr)) {
1333  ntfs_debug("hiberfil.sys is larger than 4kiB "
1334  "(0x%llx), does not contain the "
1335  "\"hibr\" magic, and does not have a "
1336  "zero header. Windows is hibernated "
1337  "on the volume. This is not the "
1338  "system volume.", i_size_read(vi));
1339  goto unm_iput_out;
1340  }
1341  } while (++kaddr < kend);
1342  ntfs_debug("hiberfil.sys contains a zero header. Windows is not "
1343  "hibernated on the volume. This is the system "
1344  "volume.");
1345  ret = 0;
1346 unm_iput_out:
1347  ntfs_unmap_page(page);
1348 iput_out:
1349  iput(vi);
1350  return ret;
1351 }
1352 
1360 static bool load_and_init_quota(ntfs_volume *vol)
1361 {
1362  MFT_REF mref;
1363  struct inode *tmp_ino;
1364  ntfs_name *name = NULL;
1365  static const ntfschar Quota[7] = { cpu_to_le16('$'),
1366  cpu_to_le16('Q'), cpu_to_le16('u'),
1367  cpu_to_le16('o'), cpu_to_le16('t'),
1368  cpu_to_le16('a'), 0 };
1369  static ntfschar Q[3] = { cpu_to_le16('$'),
1370  cpu_to_le16('Q'), 0 };
1371 
1372  ntfs_debug("Entering.");
1373  /*
1374  * Find the inode number for the quota file by looking up the filename
1375  * $Quota in the extended system files directory $Extend.
1376  */
1377  mutex_lock(&vol->extend_ino->i_mutex);
1378  mref = ntfs_lookup_inode_by_name(NTFS_I(vol->extend_ino), Quota, 6,
1379  &name);
1380  mutex_unlock(&vol->extend_ino->i_mutex);
1381  if (IS_ERR_MREF(mref)) {
1382  /*
1383  * If the file does not exist, quotas are disabled and have
1384  * never been enabled on this volume, just return success.
1385  */
1386  if (MREF_ERR(mref) == -ENOENT) {
1387  ntfs_debug("$Quota not present. Volume does not have "
1388  "quotas enabled.");
1389  /*
1390  * No need to try to set quotas out of date if they are
1391  * not enabled.
1392  */
1393  NVolSetQuotaOutOfDate(vol);
1394  return true;
1395  }
1396  /* A real error occurred. */
1397  ntfs_error(vol->sb, "Failed to find inode number for $Quota.");
1398  return false;
1399  }
1400  /* We do not care for the type of match that was found. */
1401  kfree(name);
1402  /* Get the inode. */
1403  tmp_ino = ntfs_iget(vol->sb, MREF(mref));
1404  if (IS_ERR(tmp_ino) || is_bad_inode(tmp_ino)) {
1405  if (!IS_ERR(tmp_ino))
1406  iput(tmp_ino);
1407  ntfs_error(vol->sb, "Failed to load $Quota.");
1408  return false;
1409  }
1410  vol->quota_ino = tmp_ino;
1411  /* Get the $Q index allocation attribute. */
1412  tmp_ino = ntfs_index_iget(vol->quota_ino, Q, 2);
1413  if (IS_ERR(tmp_ino)) {
1414  ntfs_error(vol->sb, "Failed to load $Quota/$Q index.");
1415  return false;
1416  }
1417  vol->quota_q_ino = tmp_ino;
1418  ntfs_debug("Done.");
1419  return true;
1420 }
1421 
1436 static bool load_and_init_usnjrnl(ntfs_volume *vol)
1437 {
1438  MFT_REF mref;
1439  struct inode *tmp_ino;
1440  ntfs_inode *tmp_ni;
1441  struct page *page;
1442  ntfs_name *name = NULL;
1443  USN_HEADER *uh;
1444  static const ntfschar UsnJrnl[9] = { cpu_to_le16('$'),
1445  cpu_to_le16('U'), cpu_to_le16('s'),
1446  cpu_to_le16('n'), cpu_to_le16('J'),
1447  cpu_to_le16('r'), cpu_to_le16('n'),
1448  cpu_to_le16('l'), 0 };
1449  static ntfschar Max[5] = { cpu_to_le16('$'),
1450  cpu_to_le16('M'), cpu_to_le16('a'),
1451  cpu_to_le16('x'), 0 };
1452  static ntfschar J[3] = { cpu_to_le16('$'),
1453  cpu_to_le16('J'), 0 };
1454 
1455  ntfs_debug("Entering.");
1456  /*
1457  * Find the inode number for the transaction log file by looking up the
1458  * filename $UsnJrnl in the extended system files directory $Extend.
1459  */
1460  mutex_lock(&vol->extend_ino->i_mutex);
1461  mref = ntfs_lookup_inode_by_name(NTFS_I(vol->extend_ino), UsnJrnl, 8,
1462  &name);
1463  mutex_unlock(&vol->extend_ino->i_mutex);
1464  if (IS_ERR_MREF(mref)) {
1465  /*
1466  * If the file does not exist, transaction logging is disabled,
1467  * just return success.
1468  */
1469  if (MREF_ERR(mref) == -ENOENT) {
1470  ntfs_debug("$UsnJrnl not present. Volume does not "
1471  "have transaction logging enabled.");
1472 not_enabled:
1473  /*
1474  * No need to try to stamp the transaction log if
1475  * transaction logging is not enabled.
1476  */
1477  NVolSetUsnJrnlStamped(vol);
1478  return true;
1479  }
1480  /* A real error occurred. */
1481  ntfs_error(vol->sb, "Failed to find inode number for "
1482  "$UsnJrnl.");
1483  return false;
1484  }
1485  /* We do not care for the type of match that was found. */
1486  kfree(name);
1487  /* Get the inode. */
1488  tmp_ino = ntfs_iget(vol->sb, MREF(mref));
1489  if (unlikely(IS_ERR(tmp_ino) || is_bad_inode(tmp_ino))) {
1490  if (!IS_ERR(tmp_ino))
1491  iput(tmp_ino);
1492  ntfs_error(vol->sb, "Failed to load $UsnJrnl.");
1493  return false;
1494  }
1495  vol->usnjrnl_ino = tmp_ino;
1496  /*
1497  * If the transaction log is in the process of being deleted, we can
1498  * ignore it.
1499  */
1500  if (unlikely(vol->vol_flags & VOLUME_DELETE_USN_UNDERWAY)) {
1501  ntfs_debug("$UsnJrnl in the process of being disabled. "
1502  "Volume does not have transaction logging "
1503  "enabled.");
1504  goto not_enabled;
1505  }
1506  /* Get the $DATA/$Max attribute. */
1507  tmp_ino = ntfs_attr_iget(vol->usnjrnl_ino, AT_DATA, Max, 4);
1508  if (IS_ERR(tmp_ino)) {
1509  ntfs_error(vol->sb, "Failed to load $UsnJrnl/$DATA/$Max "
1510  "attribute.");
1511  return false;
1512  }
1513  vol->usnjrnl_max_ino = tmp_ino;
1514  if (unlikely(i_size_read(tmp_ino) < sizeof(USN_HEADER))) {
1515  ntfs_error(vol->sb, "Found corrupt $UsnJrnl/$DATA/$Max "
1516  "attribute (size is 0x%llx but should be at "
1517  "least 0x%zx bytes).", i_size_read(tmp_ino),
1518  sizeof(USN_HEADER));
1519  return false;
1520  }
1521  /* Get the $DATA/$J attribute. */
1522  tmp_ino = ntfs_attr_iget(vol->usnjrnl_ino, AT_DATA, J, 2);
1523  if (IS_ERR(tmp_ino)) {
1524  ntfs_error(vol->sb, "Failed to load $UsnJrnl/$DATA/$J "
1525  "attribute.");
1526  return false;
1527  }
1528  vol->usnjrnl_j_ino = tmp_ino;
1529  /* Verify $J is non-resident and sparse. */
1530  tmp_ni = NTFS_I(vol->usnjrnl_j_ino);
1531  if (unlikely(!NInoNonResident(tmp_ni) || !NInoSparse(tmp_ni))) {
1532  ntfs_error(vol->sb, "$UsnJrnl/$DATA/$J attribute is resident "
1533  "and/or not sparse.");
1534  return false;
1535  }
1536  /* Read the USN_HEADER from $DATA/$Max. */
1537  page = ntfs_map_page(vol->usnjrnl_max_ino->i_mapping, 0);
1538  if (IS_ERR(page)) {
1539  ntfs_error(vol->sb, "Failed to read from $UsnJrnl/$DATA/$Max "
1540  "attribute.");
1541  return false;
1542  }
1543  uh = (USN_HEADER*)page_address(page);
1544  /* Sanity check the $Max. */
1545  if (unlikely(sle64_to_cpu(uh->allocation_delta) >
1546  sle64_to_cpu(uh->maximum_size))) {
1547  ntfs_error(vol->sb, "Allocation delta (0x%llx) exceeds "
1548  "maximum size (0x%llx). $UsnJrnl is corrupt.",
1549  (long long)sle64_to_cpu(uh->allocation_delta),
1550  (long long)sle64_to_cpu(uh->maximum_size));
1551  ntfs_unmap_page(page);
1552  return false;
1553  }
1554  /*
1555  * If the transaction log has been stamped and nothing has been written
1556  * to it since, we do not need to stamp it.
1557  */
1558  if (unlikely(sle64_to_cpu(uh->lowest_valid_usn) >=
1559  i_size_read(vol->usnjrnl_j_ino))) {
1560  if (likely(sle64_to_cpu(uh->lowest_valid_usn) ==
1561  i_size_read(vol->usnjrnl_j_ino))) {
1562  ntfs_unmap_page(page);
1563  ntfs_debug("$UsnJrnl is enabled but nothing has been "
1564  "logged since it was last stamped. "
1565  "Treating this as if the volume does "
1566  "not have transaction logging "
1567  "enabled.");
1568  goto not_enabled;
1569  }
1570  ntfs_error(vol->sb, "$UsnJrnl has lowest valid usn (0x%llx) "
1571  "which is out of bounds (0x%llx). $UsnJrnl "
1572  "is corrupt.",
1573  (long long)sle64_to_cpu(uh->lowest_valid_usn),
1574  i_size_read(vol->usnjrnl_j_ino));
1575  ntfs_unmap_page(page);
1576  return false;
1577  }
1578  ntfs_unmap_page(page);
1579  ntfs_debug("Done.");
1580  return true;
1581 }
1582 
1589 static bool load_and_init_attrdef(ntfs_volume *vol)
1590 {
1591  loff_t i_size;
1592  struct super_block *sb = vol->sb;
1593  struct inode *ino;
1594  struct page *page;
1595  pgoff_t index, max_index;
1596  unsigned int size;
1597 
1598  ntfs_debug("Entering.");
1599  /* Read attrdef table and setup vol->attrdef and vol->attrdef_size. */
1600  ino = ntfs_iget(sb, FILE_AttrDef);
1601  if (IS_ERR(ino) || is_bad_inode(ino)) {
1602  if (!IS_ERR(ino))
1603  iput(ino);
1604  goto failed;
1605  }
1606  NInoSetSparseDisabled(NTFS_I(ino));
1607  /* The size of FILE_AttrDef must be above 0 and fit inside 31 bits. */
1608  i_size = i_size_read(ino);
1609  if (i_size <= 0 || i_size > 0x7fffffff)
1610  goto iput_failed;
1611  vol->attrdef = (ATTR_DEF*)ntfs_malloc_nofs(i_size);
1612  if (!vol->attrdef)
1613  goto iput_failed;
1614  index = 0;
1615  max_index = i_size >> PAGE_CACHE_SHIFT;
1616  size = PAGE_CACHE_SIZE;
1617  while (index < max_index) {
1618  /* Read the attrdef table and copy it into the linear buffer. */
1619 read_partial_attrdef_page:
1620  page = ntfs_map_page(ino->i_mapping, index);
1621  if (IS_ERR(page))
1622  goto free_iput_failed;
1623  memcpy((u8*)vol->attrdef + (index++ << PAGE_CACHE_SHIFT),
1624  page_address(page), size);
1625  ntfs_unmap_page(page);
1626  };
1627  if (size == PAGE_CACHE_SIZE) {
1628  size = i_size & ~PAGE_CACHE_MASK;
1629  if (size)
1630  goto read_partial_attrdef_page;
1631  }
1632  vol->attrdef_size = i_size;
1633  ntfs_debug("Read %llu bytes from $AttrDef.", i_size);
1634  iput(ino);
1635  return true;
1636 free_iput_failed:
1637  ntfs_free(vol->attrdef);
1638  vol->attrdef = NULL;
1639 iput_failed:
1640  iput(ino);
1641 failed:
1642  ntfs_error(sb, "Failed to initialize attribute definition table.");
1643  return false;
1644 }
1645 
1646 #endif /* NTFS_RW */
1647 
1654 static bool load_and_init_upcase(ntfs_volume *vol)
1655 {
1656  loff_t i_size;
1657  struct super_block *sb = vol->sb;
1658  struct inode *ino;
1659  struct page *page;
1660  pgoff_t index, max_index;
1661  unsigned int size;
1662  int i, max;
1663 
1664  ntfs_debug("Entering.");
1665  /* Read upcase table and setup vol->upcase and vol->upcase_len. */
1666  ino = ntfs_iget(sb, FILE_UpCase);
1667  if (IS_ERR(ino) || is_bad_inode(ino)) {
1668  if (!IS_ERR(ino))
1669  iput(ino);
1670  goto upcase_failed;
1671  }
1672  /*
1673  * The upcase size must not be above 64k Unicode characters, must not
1674  * be zero and must be a multiple of sizeof(ntfschar).
1675  */
1676  i_size = i_size_read(ino);
1677  if (!i_size || i_size & (sizeof(ntfschar) - 1) ||
1678  i_size > 64ULL * 1024 * sizeof(ntfschar))
1679  goto iput_upcase_failed;
1680  vol->upcase = (ntfschar*)ntfs_malloc_nofs(i_size);
1681  if (!vol->upcase)
1682  goto iput_upcase_failed;
1683  index = 0;
1684  max_index = i_size >> PAGE_CACHE_SHIFT;
1685  size = PAGE_CACHE_SIZE;
1686  while (index < max_index) {
1687  /* Read the upcase table and copy it into the linear buffer. */
1688 read_partial_upcase_page:
1689  page = ntfs_map_page(ino->i_mapping, index);
1690  if (IS_ERR(page))
1691  goto iput_upcase_failed;
1692  memcpy((char*)vol->upcase + (index++ << PAGE_CACHE_SHIFT),
1693  page_address(page), size);
1694  ntfs_unmap_page(page);
1695  };
1696  if (size == PAGE_CACHE_SIZE) {
1697  size = i_size & ~PAGE_CACHE_MASK;
1698  if (size)
1699  goto read_partial_upcase_page;
1700  }
1701  vol->upcase_len = i_size >> UCHAR_T_SIZE_BITS;
1702  ntfs_debug("Read %llu bytes from $UpCase (expected %zu bytes).",
1703  i_size, 64 * 1024 * sizeof(ntfschar));
1704  iput(ino);
1705  mutex_lock(&ntfs_lock);
1706  if (!default_upcase) {
1707  ntfs_debug("Using volume specified $UpCase since default is "
1708  "not present.");
1709  mutex_unlock(&ntfs_lock);
1710  return true;
1711  }
1712  max = default_upcase_len;
1713  if (max > vol->upcase_len)
1714  max = vol->upcase_len;
1715  for (i = 0; i < max; i++)
1716  if (vol->upcase[i] != default_upcase[i])
1717  break;
1718  if (i == max) {
1719  ntfs_free(vol->upcase);
1720  vol->upcase = default_upcase;
1721  vol->upcase_len = max;
1722  ntfs_nr_upcase_users++;
1723  mutex_unlock(&ntfs_lock);
1724  ntfs_debug("Volume specified $UpCase matches default. Using "
1725  "default.");
1726  return true;
1727  }
1728  mutex_unlock(&ntfs_lock);
1729  ntfs_debug("Using volume specified $UpCase since it does not match "
1730  "the default.");
1731  return true;
1732 iput_upcase_failed:
1733  iput(ino);
1734  ntfs_free(vol->upcase);
1735  vol->upcase = NULL;
1736 upcase_failed:
1737  mutex_lock(&ntfs_lock);
1738  if (default_upcase) {
1739  vol->upcase = default_upcase;
1740  vol->upcase_len = default_upcase_len;
1741  ntfs_nr_upcase_users++;
1742  mutex_unlock(&ntfs_lock);
1743  ntfs_error(sb, "Failed to load $UpCase from the volume. Using "
1744  "default.");
1745  return true;
1746  }
1747  mutex_unlock(&ntfs_lock);
1748  ntfs_error(sb, "Failed to initialize upcase table.");
1749  return false;
1750 }
1751 
1752 /*
1753  * The lcn and mft bitmap inodes are NTFS-internal inodes with
1754  * their own special locking rules:
1755  */
1756 static struct lock_class_key
1757  lcnbmp_runlist_lock_key, lcnbmp_mrec_lock_key,
1758  mftbmp_runlist_lock_key, mftbmp_mrec_lock_key;
1759 
1769 static bool load_system_files(ntfs_volume *vol)
1770 {
1771  struct super_block *sb = vol->sb;
1772  MFT_RECORD *m;
1773  VOLUME_INFORMATION *vi;
1774  ntfs_attr_search_ctx *ctx;
1775 #ifdef NTFS_RW
1776  RESTART_PAGE_HEADER *rp;
1777  int err;
1778 #endif /* NTFS_RW */
1779 
1780  ntfs_debug("Entering.");
1781 #ifdef NTFS_RW
1782  /* Get mft mirror inode compare the contents of $MFT and $MFTMirr. */
1783  if (!load_and_init_mft_mirror(vol) || !check_mft_mirror(vol)) {
1784  static const char *es1 = "Failed to load $MFTMirr";
1785  static const char *es2 = "$MFTMirr does not match $MFT";
1786  static const char *es3 = ". Run ntfsfix and/or chkdsk.";
1787 
1788  /* If a read-write mount, convert it to a read-only mount. */
1789  if (!(sb->s_flags & MS_RDONLY)) {
1790  if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO |
1791  ON_ERRORS_CONTINUE))) {
1792  ntfs_error(sb, "%s and neither on_errors="
1793  "continue nor on_errors="
1794  "remount-ro was specified%s",
1795  !vol->mftmirr_ino ? es1 : es2,
1796  es3);
1797  goto iput_mirr_err_out;
1798  }
1799  sb->s_flags |= MS_RDONLY;
1800  ntfs_error(sb, "%s. Mounting read-only%s",
1801  !vol->mftmirr_ino ? es1 : es2, es3);
1802  } else
1803  ntfs_warning(sb, "%s. Will not be able to remount "
1804  "read-write%s",
1805  !vol->mftmirr_ino ? es1 : es2, es3);
1806  /* This will prevent a read-write remount. */
1807  NVolSetErrors(vol);
1808  }
1809 #endif /* NTFS_RW */
1810  /* Get mft bitmap attribute inode. */
1811  vol->mftbmp_ino = ntfs_attr_iget(vol->mft_ino, AT_BITMAP, NULL, 0);
1812  if (IS_ERR(vol->mftbmp_ino)) {
1813  ntfs_error(sb, "Failed to load $MFT/$BITMAP attribute.");
1814  goto iput_mirr_err_out;
1815  }
1816  lockdep_set_class(&NTFS_I(vol->mftbmp_ino)->runlist.lock,
1817  &mftbmp_runlist_lock_key);
1818  lockdep_set_class(&NTFS_I(vol->mftbmp_ino)->mrec_lock,
1819  &mftbmp_mrec_lock_key);
1820  /* Read upcase table and setup @vol->upcase and @vol->upcase_len. */
1821  if (!load_and_init_upcase(vol))
1822  goto iput_mftbmp_err_out;
1823 #ifdef NTFS_RW
1824  /*
1825  * Read attribute definitions table and setup @vol->attrdef and
1826  * @vol->attrdef_size.
1827  */
1828  if (!load_and_init_attrdef(vol))
1829  goto iput_upcase_err_out;
1830 #endif /* NTFS_RW */
1831  /*
1832  * Get the cluster allocation bitmap inode and verify the size, no
1833  * need for any locking at this stage as we are already running
1834  * exclusively as we are mount in progress task.
1835  */
1836  vol->lcnbmp_ino = ntfs_iget(sb, FILE_Bitmap);
1837  if (IS_ERR(vol->lcnbmp_ino) || is_bad_inode(vol->lcnbmp_ino)) {
1838  if (!IS_ERR(vol->lcnbmp_ino))
1839  iput(vol->lcnbmp_ino);
1840  goto bitmap_failed;
1841  }
1842  lockdep_set_class(&NTFS_I(vol->lcnbmp_ino)->runlist.lock,
1843  &lcnbmp_runlist_lock_key);
1844  lockdep_set_class(&NTFS_I(vol->lcnbmp_ino)->mrec_lock,
1845  &lcnbmp_mrec_lock_key);
1846 
1847  NInoSetSparseDisabled(NTFS_I(vol->lcnbmp_ino));
1848  if ((vol->nr_clusters + 7) >> 3 > i_size_read(vol->lcnbmp_ino)) {
1849  iput(vol->lcnbmp_ino);
1850 bitmap_failed:
1851  ntfs_error(sb, "Failed to load $Bitmap.");
1852  goto iput_attrdef_err_out;
1853  }
1854  /*
1855  * Get the volume inode and setup our cache of the volume flags and
1856  * version.
1857  */
1858  vol->vol_ino = ntfs_iget(sb, FILE_Volume);
1859  if (IS_ERR(vol->vol_ino) || is_bad_inode(vol->vol_ino)) {
1860  if (!IS_ERR(vol->vol_ino))
1861  iput(vol->vol_ino);
1862 volume_failed:
1863  ntfs_error(sb, "Failed to load $Volume.");
1864  goto iput_lcnbmp_err_out;
1865  }
1866  m = map_mft_record(NTFS_I(vol->vol_ino));
1867  if (IS_ERR(m)) {
1868 iput_volume_failed:
1869  iput(vol->vol_ino);
1870  goto volume_failed;
1871  }
1872  if (!(ctx = ntfs_attr_get_search_ctx(NTFS_I(vol->vol_ino), m))) {
1873  ntfs_error(sb, "Failed to get attribute search context.");
1874  goto get_ctx_vol_failed;
1875  }
1876  if (ntfs_attr_lookup(AT_VOLUME_INFORMATION, NULL, 0, 0, 0, NULL, 0,
1877  ctx) || ctx->attr->non_resident || ctx->attr->flags) {
1878 err_put_vol:
1879  ntfs_attr_put_search_ctx(ctx);
1880 get_ctx_vol_failed:
1881  unmap_mft_record(NTFS_I(vol->vol_ino));
1882  goto iput_volume_failed;
1883  }
1884  vi = (VOLUME_INFORMATION*)((char*)ctx->attr +
1885  le16_to_cpu(ctx->attr->data.resident.value_offset));
1886  /* Some bounds checks. */
1887  if ((u8*)vi < (u8*)ctx->attr || (u8*)vi +
1888  le32_to_cpu(ctx->attr->data.resident.value_length) >
1889  (u8*)ctx->attr + le32_to_cpu(ctx->attr->length))
1890  goto err_put_vol;
1891  /* Copy the volume flags and version to the ntfs_volume structure. */
1892  vol->vol_flags = vi->flags;
1893  vol->major_ver = vi->major_ver;
1894  vol->minor_ver = vi->minor_ver;
1895  ntfs_attr_put_search_ctx(ctx);
1896  unmap_mft_record(NTFS_I(vol->vol_ino));
1897  printk(KERN_INFO "NTFS volume version %i.%i.\n", vol->major_ver,
1898  vol->minor_ver);
1899  if (vol->major_ver < 3 && NVolSparseEnabled(vol)) {
1900  ntfs_warning(vol->sb, "Disabling sparse support due to NTFS "
1901  "volume version %i.%i (need at least version "
1902  "3.0).", vol->major_ver, vol->minor_ver);
1903  NVolClearSparseEnabled(vol);
1904  }
1905 #ifdef NTFS_RW
1906  /* Make sure that no unsupported volume flags are set. */
1907  if (vol->vol_flags & VOLUME_MUST_MOUNT_RO_MASK) {
1908  static const char *es1a = "Volume is dirty";
1909  static const char *es1b = "Volume has been modified by chkdsk";
1910  static const char *es1c = "Volume has unsupported flags set";
1911  static const char *es2a = ". Run chkdsk and mount in Windows.";
1912  static const char *es2b = ". Mount in Windows.";
1913  const char *es1, *es2;
1914 
1915  es2 = es2a;
1916  if (vol->vol_flags & VOLUME_IS_DIRTY)
1917  es1 = es1a;
1918  else if (vol->vol_flags & VOLUME_MODIFIED_BY_CHKDSK) {
1919  es1 = es1b;
1920  es2 = es2b;
1921  } else {
1922  es1 = es1c;
1923  ntfs_warning(sb, "Unsupported volume flags 0x%x "
1924  "encountered.",
1925  (unsigned)le16_to_cpu(vol->vol_flags));
1926  }
1927  /* If a read-write mount, convert it to a read-only mount. */
1928  if (!(sb->s_flags & MS_RDONLY)) {
1929  if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO |
1930  ON_ERRORS_CONTINUE))) {
1931  ntfs_error(sb, "%s and neither on_errors="
1932  "continue nor on_errors="
1933  "remount-ro was specified%s",
1934  es1, es2);
1935  goto iput_vol_err_out;
1936  }
1937  sb->s_flags |= MS_RDONLY;
1938  ntfs_error(sb, "%s. Mounting read-only%s", es1, es2);
1939  } else
1940  ntfs_warning(sb, "%s. Will not be able to remount "
1941  "read-write%s", es1, es2);
1942  /*
1943  * Do not set NVolErrors() because ntfs_remount() re-checks the
1944  * flags which we need to do in case any flags have changed.
1945  */
1946  }
1947  /*
1948  * Get the inode for the logfile, check it and determine if the volume
1949  * was shutdown cleanly.
1950  */
1951  rp = NULL;
1952  if (!load_and_check_logfile(vol, &rp) ||
1953  !ntfs_is_logfile_clean(vol->logfile_ino, rp)) {
1954  static const char *es1a = "Failed to load $LogFile";
1955  static const char *es1b = "$LogFile is not clean";
1956  static const char *es2 = ". Mount in Windows.";
1957  const char *es1;
1958 
1959  es1 = !vol->logfile_ino ? es1a : es1b;
1960  /* If a read-write mount, convert it to a read-only mount. */
1961  if (!(sb->s_flags & MS_RDONLY)) {
1962  if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO |
1963  ON_ERRORS_CONTINUE))) {
1964  ntfs_error(sb, "%s and neither on_errors="
1965  "continue nor on_errors="
1966  "remount-ro was specified%s",
1967  es1, es2);
1968  if (vol->logfile_ino) {
1969  BUG_ON(!rp);
1970  ntfs_free(rp);
1971  }
1972  goto iput_logfile_err_out;
1973  }
1974  sb->s_flags |= MS_RDONLY;
1975  ntfs_error(sb, "%s. Mounting read-only%s", es1, es2);
1976  } else
1977  ntfs_warning(sb, "%s. Will not be able to remount "
1978  "read-write%s", es1, es2);
1979  /* This will prevent a read-write remount. */
1980  NVolSetErrors(vol);
1981  }
1982  ntfs_free(rp);
1983 #endif /* NTFS_RW */
1984  /* Get the root directory inode so we can do path lookups. */
1985  vol->root_ino = ntfs_iget(sb, FILE_root);
1986  if (IS_ERR(vol->root_ino) || is_bad_inode(vol->root_ino)) {
1987  if (!IS_ERR(vol->root_ino))
1988  iput(vol->root_ino);
1989  ntfs_error(sb, "Failed to load root directory.");
1990  goto iput_logfile_err_out;
1991  }
1992 #ifdef NTFS_RW
1993  /*
1994  * Check if Windows is suspended to disk on the target volume. If it
1995  * is hibernated, we must not write *anything* to the disk so set
1996  * NVolErrors() without setting the dirty volume flag and mount
1997  * read-only. This will prevent read-write remounting and it will also
1998  * prevent all writes.
1999  */
2000  err = check_windows_hibernation_status(vol);
2001  if (unlikely(err)) {
2002  static const char *es1a = "Failed to determine if Windows is "
2003  "hibernated";
2004  static const char *es1b = "Windows is hibernated";
2005  static const char *es2 = ". Run chkdsk.";
2006  const char *es1;
2007 
2008  es1 = err < 0 ? es1a : es1b;
2009  /* If a read-write mount, convert it to a read-only mount. */
2010  if (!(sb->s_flags & MS_RDONLY)) {
2011  if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO |
2012  ON_ERRORS_CONTINUE))) {
2013  ntfs_error(sb, "%s and neither on_errors="
2014  "continue nor on_errors="
2015  "remount-ro was specified%s",
2016  es1, es2);
2017  goto iput_root_err_out;
2018  }
2019  sb->s_flags |= MS_RDONLY;
2020  ntfs_error(sb, "%s. Mounting read-only%s", es1, es2);
2021  } else
2022  ntfs_warning(sb, "%s. Will not be able to remount "
2023  "read-write%s", es1, es2);
2024  /* This will prevent a read-write remount. */
2025  NVolSetErrors(vol);
2026  }
2027  /* If (still) a read-write mount, mark the volume dirty. */
2028  if (!(sb->s_flags & MS_RDONLY) &&
2029  ntfs_set_volume_flags(vol, VOLUME_IS_DIRTY)) {
2030  static const char *es1 = "Failed to set dirty bit in volume "
2031  "information flags";
2032  static const char *es2 = ". Run chkdsk.";
2033 
2034  /* Convert to a read-only mount. */
2035  if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO |
2036  ON_ERRORS_CONTINUE))) {
2037  ntfs_error(sb, "%s and neither on_errors=continue nor "
2038  "on_errors=remount-ro was specified%s",
2039  es1, es2);
2040  goto iput_root_err_out;
2041  }
2042  ntfs_error(sb, "%s. Mounting read-only%s", es1, es2);
2043  sb->s_flags |= MS_RDONLY;
2044  /*
2045  * Do not set NVolErrors() because ntfs_remount() might manage
2046  * to set the dirty flag in which case all would be well.
2047  */
2048  }
2049 #if 0
2050  // TODO: Enable this code once we start modifying anything that is
2051  // different between NTFS 1.2 and 3.x...
2052  /*
2053  * If (still) a read-write mount, set the NT4 compatibility flag on
2054  * newer NTFS version volumes.
2055  */
2056  if (!(sb->s_flags & MS_RDONLY) && (vol->major_ver > 1) &&
2057  ntfs_set_volume_flags(vol, VOLUME_MOUNTED_ON_NT4)) {
2058  static const char *es1 = "Failed to set NT4 compatibility flag";
2059  static const char *es2 = ". Run chkdsk.";
2060 
2061  /* Convert to a read-only mount. */
2062  if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO |
2063  ON_ERRORS_CONTINUE))) {
2064  ntfs_error(sb, "%s and neither on_errors=continue nor "
2065  "on_errors=remount-ro was specified%s",
2066  es1, es2);
2067  goto iput_root_err_out;
2068  }
2069  ntfs_error(sb, "%s. Mounting read-only%s", es1, es2);
2070  sb->s_flags |= MS_RDONLY;
2071  NVolSetErrors(vol);
2072  }
2073 #endif
2074  /* If (still) a read-write mount, empty the logfile. */
2075  if (!(sb->s_flags & MS_RDONLY) &&
2076  !ntfs_empty_logfile(vol->logfile_ino)) {
2077  static const char *es1 = "Failed to empty $LogFile";
2078  static const char *es2 = ". Mount in Windows.";
2079 
2080  /* Convert to a read-only mount. */
2081  if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO |
2082  ON_ERRORS_CONTINUE))) {
2083  ntfs_error(sb, "%s and neither on_errors=continue nor "
2084  "on_errors=remount-ro was specified%s",
2085  es1, es2);
2086  goto iput_root_err_out;
2087  }
2088  ntfs_error(sb, "%s. Mounting read-only%s", es1, es2);
2089  sb->s_flags |= MS_RDONLY;
2090  NVolSetErrors(vol);
2091  }
2092 #endif /* NTFS_RW */
2093  /* If on NTFS versions before 3.0, we are done. */
2094  if (unlikely(vol->major_ver < 3))
2095  return true;
2096  /* NTFS 3.0+ specific initialization. */
2097  /* Get the security descriptors inode. */
2098  vol->secure_ino = ntfs_iget(sb, FILE_Secure);
2099  if (IS_ERR(vol->secure_ino) || is_bad_inode(vol->secure_ino)) {
2100  if (!IS_ERR(vol->secure_ino))
2101  iput(vol->secure_ino);
2102  ntfs_error(sb, "Failed to load $Secure.");
2103  goto iput_root_err_out;
2104  }
2105  // TODO: Initialize security.
2106  /* Get the extended system files' directory inode. */
2107  vol->extend_ino = ntfs_iget(sb, FILE_Extend);
2108  if (IS_ERR(vol->extend_ino) || is_bad_inode(vol->extend_ino)) {
2109  if (!IS_ERR(vol->extend_ino))
2110  iput(vol->extend_ino);
2111  ntfs_error(sb, "Failed to load $Extend.");
2112  goto iput_sec_err_out;
2113  }
2114 #ifdef NTFS_RW
2115  /* Find the quota file, load it if present, and set it up. */
2116  if (!load_and_init_quota(vol)) {
2117  static const char *es1 = "Failed to load $Quota";
2118  static const char *es2 = ". Run chkdsk.";
2119 
2120  /* If a read-write mount, convert it to a read-only mount. */
2121  if (!(sb->s_flags & MS_RDONLY)) {
2122  if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO |
2123  ON_ERRORS_CONTINUE))) {
2124  ntfs_error(sb, "%s and neither on_errors="
2125  "continue nor on_errors="
2126  "remount-ro was specified%s",
2127  es1, es2);
2128  goto iput_quota_err_out;
2129  }
2130  sb->s_flags |= MS_RDONLY;
2131  ntfs_error(sb, "%s. Mounting read-only%s", es1, es2);
2132  } else
2133  ntfs_warning(sb, "%s. Will not be able to remount "
2134  "read-write%s", es1, es2);
2135  /* This will prevent a read-write remount. */
2136  NVolSetErrors(vol);
2137  }
2138  /* If (still) a read-write mount, mark the quotas out of date. */
2139  if (!(sb->s_flags & MS_RDONLY) &&
2140  !ntfs_mark_quotas_out_of_date(vol)) {
2141  static const char *es1 = "Failed to mark quotas out of date";
2142  static const char *es2 = ". Run chkdsk.";
2143 
2144  /* Convert to a read-only mount. */
2145  if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO |
2146  ON_ERRORS_CONTINUE))) {
2147  ntfs_error(sb, "%s and neither on_errors=continue nor "
2148  "on_errors=remount-ro was specified%s",
2149  es1, es2);
2150  goto iput_quota_err_out;
2151  }
2152  ntfs_error(sb, "%s. Mounting read-only%s", es1, es2);
2153  sb->s_flags |= MS_RDONLY;
2154  NVolSetErrors(vol);
2155  }
2156  /*
2157  * Find the transaction log file ($UsnJrnl), load it if present, check
2158  * it, and set it up.
2159  */
2160  if (!load_and_init_usnjrnl(vol)) {
2161  static const char *es1 = "Failed to load $UsnJrnl";
2162  static const char *es2 = ". Run chkdsk.";
2163 
2164  /* If a read-write mount, convert it to a read-only mount. */
2165  if (!(sb->s_flags & MS_RDONLY)) {
2166  if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO |
2167  ON_ERRORS_CONTINUE))) {
2168  ntfs_error(sb, "%s and neither on_errors="
2169  "continue nor on_errors="
2170  "remount-ro was specified%s",
2171  es1, es2);
2172  goto iput_usnjrnl_err_out;
2173  }
2174  sb->s_flags |= MS_RDONLY;
2175  ntfs_error(sb, "%s. Mounting read-only%s", es1, es2);
2176  } else
2177  ntfs_warning(sb, "%s. Will not be able to remount "
2178  "read-write%s", es1, es2);
2179  /* This will prevent a read-write remount. */
2180  NVolSetErrors(vol);
2181  }
2182  /* If (still) a read-write mount, stamp the transaction log. */
2183  if (!(sb->s_flags & MS_RDONLY) && !ntfs_stamp_usnjrnl(vol)) {
2184  static const char *es1 = "Failed to stamp transaction log "
2185  "($UsnJrnl)";
2186  static const char *es2 = ". Run chkdsk.";
2187 
2188  /* Convert to a read-only mount. */
2189  if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO |
2190  ON_ERRORS_CONTINUE))) {
2191  ntfs_error(sb, "%s and neither on_errors=continue nor "
2192  "on_errors=remount-ro was specified%s",
2193  es1, es2);
2194  goto iput_usnjrnl_err_out;
2195  }
2196  ntfs_error(sb, "%s. Mounting read-only%s", es1, es2);
2197  sb->s_flags |= MS_RDONLY;
2198  NVolSetErrors(vol);
2199  }
2200 #endif /* NTFS_RW */
2201  return true;
2202 #ifdef NTFS_RW
2203 iput_usnjrnl_err_out:
2204  if (vol->usnjrnl_j_ino)
2205  iput(vol->usnjrnl_j_ino);
2206  if (vol->usnjrnl_max_ino)
2207  iput(vol->usnjrnl_max_ino);
2208  if (vol->usnjrnl_ino)
2209  iput(vol->usnjrnl_ino);
2210 iput_quota_err_out:
2211  if (vol->quota_q_ino)
2212  iput(vol->quota_q_ino);
2213  if (vol->quota_ino)
2214  iput(vol->quota_ino);
2215  iput(vol->extend_ino);
2216 #endif /* NTFS_RW */
2217 iput_sec_err_out:
2218  iput(vol->secure_ino);
2219 iput_root_err_out:
2220  iput(vol->root_ino);
2221 iput_logfile_err_out:
2222 #ifdef NTFS_RW
2223  if (vol->logfile_ino)
2224  iput(vol->logfile_ino);
2225 iput_vol_err_out:
2226 #endif /* NTFS_RW */
2227  iput(vol->vol_ino);
2228 iput_lcnbmp_err_out:
2229  iput(vol->lcnbmp_ino);
2230 iput_attrdef_err_out:
2231  vol->attrdef_size = 0;
2232  if (vol->attrdef) {
2233  ntfs_free(vol->attrdef);
2234  vol->attrdef = NULL;
2235  }
2236 #ifdef NTFS_RW
2237 iput_upcase_err_out:
2238 #endif /* NTFS_RW */
2239  vol->upcase_len = 0;
2240  mutex_lock(&ntfs_lock);
2241  if (vol->upcase == default_upcase) {
2242  ntfs_nr_upcase_users--;
2243  vol->upcase = NULL;
2244  }
2245  mutex_unlock(&ntfs_lock);
2246  if (vol->upcase) {
2247  ntfs_free(vol->upcase);
2248  vol->upcase = NULL;
2249  }
2250 iput_mftbmp_err_out:
2251  iput(vol->mftbmp_ino);
2252 iput_mirr_err_out:
2253 #ifdef NTFS_RW
2254  if (vol->mftmirr_ino)
2255  iput(vol->mftmirr_ino);
2256 #endif /* NTFS_RW */
2257  return false;
2258 }
2259 
2269 static void ntfs_put_super(struct super_block *sb)
2270 {
2271  ntfs_volume *vol = NTFS_SB(sb);
2272 
2273  ntfs_debug("Entering.");
2274 
2275 #ifdef NTFS_RW
2276  /*
2277  * Commit all inodes while they are still open in case some of them
2278  * cause others to be dirtied.
2279  */
2280  ntfs_commit_inode(vol->vol_ino);
2281 
2282  /* NTFS 3.0+ specific. */
2283  if (vol->major_ver >= 3) {
2284  if (vol->usnjrnl_j_ino)
2285  ntfs_commit_inode(vol->usnjrnl_j_ino);
2286  if (vol->usnjrnl_max_ino)
2287  ntfs_commit_inode(vol->usnjrnl_max_ino);
2288  if (vol->usnjrnl_ino)
2289  ntfs_commit_inode(vol->usnjrnl_ino);
2290  if (vol->quota_q_ino)
2291  ntfs_commit_inode(vol->quota_q_ino);
2292  if (vol->quota_ino)
2293  ntfs_commit_inode(vol->quota_ino);
2294  if (vol->extend_ino)
2295  ntfs_commit_inode(vol->extend_ino);
2296  if (vol->secure_ino)
2297  ntfs_commit_inode(vol->secure_ino);
2298  }
2299 
2300  ntfs_commit_inode(vol->root_ino);
2301 
2302  down_write(&vol->lcnbmp_lock);
2303  ntfs_commit_inode(vol->lcnbmp_ino);
2304  up_write(&vol->lcnbmp_lock);
2305 
2306  down_write(&vol->mftbmp_lock);
2307  ntfs_commit_inode(vol->mftbmp_ino);
2308  up_write(&vol->mftbmp_lock);
2309 
2310  if (vol->logfile_ino)
2311  ntfs_commit_inode(vol->logfile_ino);
2312 
2313  if (vol->mftmirr_ino)
2314  ntfs_commit_inode(vol->mftmirr_ino);
2315  ntfs_commit_inode(vol->mft_ino);
2316 
2317  /*
2318  * If a read-write mount and no volume errors have occurred, mark the
2319  * volume clean. Also, re-commit all affected inodes.
2320  */
2321  if (!(sb->s_flags & MS_RDONLY)) {
2322  if (!NVolErrors(vol)) {
2323  if (ntfs_clear_volume_flags(vol, VOLUME_IS_DIRTY))
2324  ntfs_warning(sb, "Failed to clear dirty bit "
2325  "in volume information "
2326  "flags. Run chkdsk.");
2327  ntfs_commit_inode(vol->vol_ino);
2328  ntfs_commit_inode(vol->root_ino);
2329  if (vol->mftmirr_ino)
2330  ntfs_commit_inode(vol->mftmirr_ino);
2331  ntfs_commit_inode(vol->mft_ino);
2332  } else {
2333  ntfs_warning(sb, "Volume has errors. Leaving volume "
2334  "marked dirty. Run chkdsk.");
2335  }
2336  }
2337 #endif /* NTFS_RW */
2338 
2339  iput(vol->vol_ino);
2340  vol->vol_ino = NULL;
2341 
2342  /* NTFS 3.0+ specific clean up. */
2343  if (vol->major_ver >= 3) {
2344 #ifdef NTFS_RW
2345  if (vol->usnjrnl_j_ino) {
2346  iput(vol->usnjrnl_j_ino);
2347  vol->usnjrnl_j_ino = NULL;
2348  }
2349  if (vol->usnjrnl_max_ino) {
2350  iput(vol->usnjrnl_max_ino);
2351  vol->usnjrnl_max_ino = NULL;
2352  }
2353  if (vol->usnjrnl_ino) {
2354  iput(vol->usnjrnl_ino);
2355  vol->usnjrnl_ino = NULL;
2356  }
2357  if (vol->quota_q_ino) {
2358  iput(vol->quota_q_ino);
2359  vol->quota_q_ino = NULL;
2360  }
2361  if (vol->quota_ino) {
2362  iput(vol->quota_ino);
2363  vol->quota_ino = NULL;
2364  }
2365 #endif /* NTFS_RW */
2366  if (vol->extend_ino) {
2367  iput(vol->extend_ino);
2368  vol->extend_ino = NULL;
2369  }
2370  if (vol->secure_ino) {
2371  iput(vol->secure_ino);
2372  vol->secure_ino = NULL;
2373  }
2374  }
2375 
2376  iput(vol->root_ino);
2377  vol->root_ino = NULL;
2378 
2379  down_write(&vol->lcnbmp_lock);
2380  iput(vol->lcnbmp_ino);
2381  vol->lcnbmp_ino = NULL;
2382  up_write(&vol->lcnbmp_lock);
2383 
2384  down_write(&vol->mftbmp_lock);
2385  iput(vol->mftbmp_ino);
2386  vol->mftbmp_ino = NULL;
2387  up_write(&vol->mftbmp_lock);
2388 
2389 #ifdef NTFS_RW
2390  if (vol->logfile_ino) {
2391  iput(vol->logfile_ino);
2392  vol->logfile_ino = NULL;
2393  }
2394  if (vol->mftmirr_ino) {
2395  /* Re-commit the mft mirror and mft just in case. */
2396  ntfs_commit_inode(vol->mftmirr_ino);
2397  ntfs_commit_inode(vol->mft_ino);
2398  iput(vol->mftmirr_ino);
2399  vol->mftmirr_ino = NULL;
2400  }
2401  /*
2402  * We should have no dirty inodes left, due to
2403  * mft.c::ntfs_mft_writepage() cleaning all the dirty pages as
2404  * the underlying mft records are written out and cleaned.
2405  */
2406  ntfs_commit_inode(vol->mft_ino);
2407  write_inode_now(vol->mft_ino, 1);
2408 #endif /* NTFS_RW */
2409 
2410  iput(vol->mft_ino);
2411  vol->mft_ino = NULL;
2412 
2413  /* Throw away the table of attribute definitions. */
2414  vol->attrdef_size = 0;
2415  if (vol->attrdef) {
2416  ntfs_free(vol->attrdef);
2417  vol->attrdef = NULL;
2418  }
2419  vol->upcase_len = 0;
2420  /*
2421  * Destroy the global default upcase table if necessary. Also decrease
2422  * the number of upcase users if we are a user.
2423  */
2424  mutex_lock(&ntfs_lock);
2425  if (vol->upcase == default_upcase) {
2426  ntfs_nr_upcase_users--;
2427  vol->upcase = NULL;
2428  }
2429  if (!ntfs_nr_upcase_users && default_upcase) {
2430  ntfs_free(default_upcase);
2431  default_upcase = NULL;
2432  }
2433  if (vol->cluster_size <= 4096 && !--ntfs_nr_compression_users)
2434  free_compression_buffers();
2435  mutex_unlock(&ntfs_lock);
2436  if (vol->upcase) {
2437  ntfs_free(vol->upcase);
2438  vol->upcase = NULL;
2439  }
2440 
2441  unload_nls(vol->nls_map);
2442 
2443  sb->s_fs_info = NULL;
2444  kfree(vol);
2445 }
2446 
2466 static s64 get_nr_free_clusters(ntfs_volume *vol)
2467 {
2468  s64 nr_free = vol->nr_clusters;
2469  struct address_space *mapping = vol->lcnbmp_ino->i_mapping;
2470  struct page *page;
2471  pgoff_t index, max_index;
2472 
2473  ntfs_debug("Entering.");
2474  /* Serialize accesses to the cluster bitmap. */
2475  down_read(&vol->lcnbmp_lock);
2476  /*
2477  * Convert the number of bits into bytes rounded up, then convert into
2478  * multiples of PAGE_CACHE_SIZE, rounding up so that if we have one
2479  * full and one partial page max_index = 2.
2480  */
2481  max_index = (((vol->nr_clusters + 7) >> 3) + PAGE_CACHE_SIZE - 1) >>
2482  PAGE_CACHE_SHIFT;
2483  /* Use multiples of 4 bytes, thus max_size is PAGE_CACHE_SIZE / 4. */
2484  ntfs_debug("Reading $Bitmap, max_index = 0x%lx, max_size = 0x%lx.",
2485  max_index, PAGE_CACHE_SIZE / 4);
2486  for (index = 0; index < max_index; index++) {
2487  unsigned long *kaddr;
2488 
2489  /*
2490  * Read the page from page cache, getting it from backing store
2491  * if necessary, and increment the use count.
2492  */
2493  page = read_mapping_page(mapping, index, NULL);
2494  /* Ignore pages which errored synchronously. */
2495  if (IS_ERR(page)) {
2496  ntfs_debug("read_mapping_page() error. Skipping "
2497  "page (index 0x%lx).", index);
2498  nr_free -= PAGE_CACHE_SIZE * 8;
2499  continue;
2500  }
2501  kaddr = kmap_atomic(page);
2502  /*
2503  * Subtract the number of set bits. If this
2504  * is the last page and it is partial we don't really care as
2505  * it just means we do a little extra work but it won't affect
2506  * the result as all out of range bytes are set to zero by
2507  * ntfs_readpage().
2508  */
2509  nr_free -= bitmap_weight(kaddr,
2510  PAGE_CACHE_SIZE * BITS_PER_BYTE);
2511  kunmap_atomic(kaddr);
2512  page_cache_release(page);
2513  }
2514  ntfs_debug("Finished reading $Bitmap, last index = 0x%lx.", index - 1);
2515  /*
2516  * Fixup for eventual bits outside logical ntfs volume (see function
2517  * description above).
2518  */
2519  if (vol->nr_clusters & 63)
2520  nr_free += 64 - (vol->nr_clusters & 63);
2521  up_read(&vol->lcnbmp_lock);
2522  /* If errors occurred we may well have gone below zero, fix this. */
2523  if (nr_free < 0)
2524  nr_free = 0;
2525  ntfs_debug("Exiting.");
2526  return nr_free;
2527 }
2528 
2546 static unsigned long __get_nr_free_mft_records(ntfs_volume *vol,
2547  s64 nr_free, const pgoff_t max_index)
2548 {
2549  struct address_space *mapping = vol->mftbmp_ino->i_mapping;
2550  struct page *page;
2551  pgoff_t index;
2552 
2553  ntfs_debug("Entering.");
2554  /* Use multiples of 4 bytes, thus max_size is PAGE_CACHE_SIZE / 4. */
2555  ntfs_debug("Reading $MFT/$BITMAP, max_index = 0x%lx, max_size = "
2556  "0x%lx.", max_index, PAGE_CACHE_SIZE / 4);
2557  for (index = 0; index < max_index; index++) {
2558  unsigned long *kaddr;
2559 
2560  /*
2561  * Read the page from page cache, getting it from backing store
2562  * if necessary, and increment the use count.
2563  */
2564  page = read_mapping_page(mapping, index, NULL);
2565  /* Ignore pages which errored synchronously. */
2566  if (IS_ERR(page)) {
2567  ntfs_debug("read_mapping_page() error. Skipping "
2568  "page (index 0x%lx).", index);
2569  nr_free -= PAGE_CACHE_SIZE * 8;
2570  continue;
2571  }
2572  kaddr = kmap_atomic(page);
2573  /*
2574  * Subtract the number of set bits. If this
2575  * is the last page and it is partial we don't really care as
2576  * it just means we do a little extra work but it won't affect
2577  * the result as all out of range bytes are set to zero by
2578  * ntfs_readpage().
2579  */
2580  nr_free -= bitmap_weight(kaddr,
2581  PAGE_CACHE_SIZE * BITS_PER_BYTE);
2582  kunmap_atomic(kaddr);
2583  page_cache_release(page);
2584  }
2585  ntfs_debug("Finished reading $MFT/$BITMAP, last index = 0x%lx.",
2586  index - 1);
2587  /* If errors occurred we may well have gone below zero, fix this. */
2588  if (nr_free < 0)
2589  nr_free = 0;
2590  ntfs_debug("Exiting.");
2591  return nr_free;
2592 }
2593 
2612 static int ntfs_statfs(struct dentry *dentry, struct kstatfs *sfs)
2613 {
2614  struct super_block *sb = dentry->d_sb;
2615  s64 size;
2616  ntfs_volume *vol = NTFS_SB(sb);
2617  ntfs_inode *mft_ni = NTFS_I(vol->mft_ino);
2618  pgoff_t max_index;
2619  unsigned long flags;
2620 
2621  ntfs_debug("Entering.");
2622  /* Type of filesystem. */
2623  sfs->f_type = NTFS_SB_MAGIC;
2624  /* Optimal transfer block size. */
2625  sfs->f_bsize = PAGE_CACHE_SIZE;
2626  /*
2627  * Total data blocks in filesystem in units of f_bsize and since
2628  * inodes are also stored in data blocs ($MFT is a file) this is just
2629  * the total clusters.
2630  */
2631  sfs->f_blocks = vol->nr_clusters << vol->cluster_size_bits >>
2632  PAGE_CACHE_SHIFT;
2633  /* Free data blocks in filesystem in units of f_bsize. */
2634  size = get_nr_free_clusters(vol) << vol->cluster_size_bits >>
2635  PAGE_CACHE_SHIFT;
2636  if (size < 0LL)
2637  size = 0LL;
2638  /* Free blocks avail to non-superuser, same as above on NTFS. */
2639  sfs->f_bavail = sfs->f_bfree = size;
2640  /* Serialize accesses to the inode bitmap. */
2641  down_read(&vol->mftbmp_lock);
2642  read_lock_irqsave(&mft_ni->size_lock, flags);
2643  size = i_size_read(vol->mft_ino) >> vol->mft_record_size_bits;
2644  /*
2645  * Convert the maximum number of set bits into bytes rounded up, then
2646  * convert into multiples of PAGE_CACHE_SIZE, rounding up so that if we
2647  * have one full and one partial page max_index = 2.
2648  */
2649  max_index = ((((mft_ni->initialized_size >> vol->mft_record_size_bits)
2650  + 7) >> 3) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
2651  read_unlock_irqrestore(&mft_ni->size_lock, flags);
2652  /* Number of inodes in filesystem (at this point in time). */
2653  sfs->f_files = size;
2654  /* Free inodes in fs (based on current total count). */
2655  sfs->f_ffree = __get_nr_free_mft_records(vol, size, max_index);
2656  up_read(&vol->mftbmp_lock);
2657  /*
2658  * File system id. This is extremely *nix flavour dependent and even
2659  * within Linux itself all fs do their own thing. I interpret this to
2660  * mean a unique id associated with the mounted fs and not the id
2661  * associated with the filesystem driver, the latter is already given
2662  * by the filesystem type in sfs->f_type. Thus we use the 64-bit
2663  * volume serial number splitting it into two 32-bit parts. We enter
2664  * the least significant 32-bits in f_fsid[0] and the most significant
2665  * 32-bits in f_fsid[1].
2666  */
2667  sfs->f_fsid.val[0] = vol->serial_no & 0xffffffff;
2668  sfs->f_fsid.val[1] = (vol->serial_no >> 32) & 0xffffffff;
2669  /* Maximum length of filenames. */
2670  sfs->f_namelen = NTFS_MAX_NAME_LEN;
2671  return 0;
2672 }
2673 
2674 #ifdef NTFS_RW
2675 static int ntfs_write_inode(struct inode *vi, struct writeback_control *wbc)
2676 {
2677  return __ntfs_write_inode(vi, wbc->sync_mode == WB_SYNC_ALL);
2678 }
2679 #endif
2680 
2684 static const struct super_operations ntfs_sops = {
2685  .alloc_inode = ntfs_alloc_big_inode, /* VFS: Allocate new inode. */
2686  .destroy_inode = ntfs_destroy_big_inode, /* VFS: Deallocate inode. */
2687 #ifdef NTFS_RW
2688  .write_inode = ntfs_write_inode, /* VFS: Write dirty inode to
2689  disk. */
2690 #endif /* NTFS_RW */
2691  .put_super = ntfs_put_super, /* Syscall: umount. */
2692  .statfs = ntfs_statfs, /* Syscall: statfs */
2693  .remount_fs = ntfs_remount, /* Syscall: mount -o remount. */
2694  .evict_inode = ntfs_evict_big_inode, /* VFS: Called when an inode is
2695  removed from memory. */
2696  .show_options = ntfs_show_options, /* Show mount options in
2697  proc. */
2698 };
2699 
2718 static int ntfs_fill_super(struct super_block *sb, void *opt, const int silent)
2719 {
2720  ntfs_volume *vol;
2721  struct buffer_head *bh;
2722  struct inode *tmp_ino;
2723  int blocksize, result;
2724 
2725  /*
2726  * We do a pretty difficult piece of bootstrap by reading the
2727  * MFT (and other metadata) from disk into memory. We'll only
2728  * release this metadata during umount, so the locking patterns
2729  * observed during bootstrap do not count. So turn off the
2730  * observation of locking patterns (strictly for this context
2731  * only) while mounting NTFS. [The validator is still active
2732  * otherwise, even for this context: it will for example record
2733  * lock class registrations.]
2734  */
2735  lockdep_off();
2736  ntfs_debug("Entering.");
2737 #ifndef NTFS_RW
2738  sb->s_flags |= MS_RDONLY;
2739 #endif /* ! NTFS_RW */
2740  /* Allocate a new ntfs_volume and place it in sb->s_fs_info. */
2741  sb->s_fs_info = kmalloc(sizeof(ntfs_volume), GFP_NOFS);
2742  vol = NTFS_SB(sb);
2743  if (!vol) {
2744  if (!silent)
2745  ntfs_error(sb, "Allocation of NTFS volume structure "
2746  "failed. Aborting mount...");
2747  lockdep_on();
2748  return -ENOMEM;
2749  }
2750  /* Initialize ntfs_volume structure. */
2751  *vol = (ntfs_volume) {
2752  .sb = sb,
2753  /*
2754  * Default is group and other don't have any access to files or
2755  * directories while owner has full access. Further, files by
2756  * default are not executable but directories are of course
2757  * browseable.
2758  */
2759  .fmask = 0177,
2760  .dmask = 0077,
2761  };
2762  init_rwsem(&vol->mftbmp_lock);
2763  init_rwsem(&vol->lcnbmp_lock);
2764 
2765  /* By default, enable sparse support. */
2766  NVolSetSparseEnabled(vol);
2767 
2768  /* Important to get the mount options dealt with now. */
2769  if (!parse_options(vol, (char*)opt))
2770  goto err_out_now;
2771 
2772  /* We support sector sizes up to the PAGE_CACHE_SIZE. */
2773  if (bdev_logical_block_size(sb->s_bdev) > PAGE_CACHE_SIZE) {
2774  if (!silent)
2775  ntfs_error(sb, "Device has unsupported sector size "
2776  "(%i). The maximum supported sector "
2777  "size on this architecture is %lu "
2778  "bytes.",
2779  bdev_logical_block_size(sb->s_bdev),
2780  PAGE_CACHE_SIZE);
2781  goto err_out_now;
2782  }
2783  /*
2784  * Setup the device access block size to NTFS_BLOCK_SIZE or the hard
2785  * sector size, whichever is bigger.
2786  */
2787  blocksize = sb_min_blocksize(sb, NTFS_BLOCK_SIZE);
2788  if (blocksize < NTFS_BLOCK_SIZE) {
2789  if (!silent)
2790  ntfs_error(sb, "Unable to set device block size.");
2791  goto err_out_now;
2792  }
2793  BUG_ON(blocksize != sb->s_blocksize);
2794  ntfs_debug("Set device block size to %i bytes (block size bits %i).",
2795  blocksize, sb->s_blocksize_bits);
2796  /* Determine the size of the device in units of block_size bytes. */
2797  if (!i_size_read(sb->s_bdev->bd_inode)) {
2798  if (!silent)
2799  ntfs_error(sb, "Unable to determine device size.");
2800  goto err_out_now;
2801  }
2802  vol->nr_blocks = i_size_read(sb->s_bdev->bd_inode) >>
2803  sb->s_blocksize_bits;
2804  /* Read the boot sector and return unlocked buffer head to it. */
2805  if (!(bh = read_ntfs_boot_sector(sb, silent))) {
2806  if (!silent)
2807  ntfs_error(sb, "Not an NTFS volume.");
2808  goto err_out_now;
2809  }
2810  /*
2811  * Extract the data from the boot sector and setup the ntfs volume
2812  * using it.
2813  */
2814  result = parse_ntfs_boot_sector(vol, (NTFS_BOOT_SECTOR*)bh->b_data);
2815  brelse(bh);
2816  if (!result) {
2817  if (!silent)
2818  ntfs_error(sb, "Unsupported NTFS filesystem.");
2819  goto err_out_now;
2820  }
2821  /*
2822  * If the boot sector indicates a sector size bigger than the current
2823  * device block size, switch the device block size to the sector size.
2824  * TODO: It may be possible to support this case even when the set
2825  * below fails, we would just be breaking up the i/o for each sector
2826  * into multiple blocks for i/o purposes but otherwise it should just
2827  * work. However it is safer to leave disabled until someone hits this
2828  * error message and then we can get them to try it without the setting
2829  * so we know for sure that it works.
2830  */
2831  if (vol->sector_size > blocksize) {
2832  blocksize = sb_set_blocksize(sb, vol->sector_size);
2833  if (blocksize != vol->sector_size) {
2834  if (!silent)
2835  ntfs_error(sb, "Unable to set device block "
2836  "size to sector size (%i).",
2837  vol->sector_size);
2838  goto err_out_now;
2839  }
2840  BUG_ON(blocksize != sb->s_blocksize);
2841  vol->nr_blocks = i_size_read(sb->s_bdev->bd_inode) >>
2842  sb->s_blocksize_bits;
2843  ntfs_debug("Changed device block size to %i bytes (block size "
2844  "bits %i) to match volume sector size.",
2845  blocksize, sb->s_blocksize_bits);
2846  }
2847  /* Initialize the cluster and mft allocators. */
2848  ntfs_setup_allocators(vol);
2849  /* Setup remaining fields in the super block. */
2850  sb->s_magic = NTFS_SB_MAGIC;
2851  /*
2852  * Ntfs allows 63 bits for the file size, i.e. correct would be:
2853  * sb->s_maxbytes = ~0ULL >> 1;
2854  * But the kernel uses a long as the page cache page index which on
2855  * 32-bit architectures is only 32-bits. MAX_LFS_FILESIZE is kernel
2856  * defined to the maximum the page cache page index can cope with
2857  * without overflowing the index or to 2^63 - 1, whichever is smaller.
2858  */
2859  sb->s_maxbytes = MAX_LFS_FILESIZE;
2860  /* Ntfs measures time in 100ns intervals. */
2861  sb->s_time_gran = 100;
2862  /*
2863  * Now load the metadata required for the page cache and our address
2864  * space operations to function. We do this by setting up a specialised
2865  * read_inode method and then just calling the normal iget() to obtain
2866  * the inode for $MFT which is sufficient to allow our normal inode
2867  * operations and associated address space operations to function.
2868  */
2869  sb->s_op = &ntfs_sops;
2870  tmp_ino = new_inode(sb);
2871  if (!tmp_ino) {
2872  if (!silent)
2873  ntfs_error(sb, "Failed to load essential metadata.");
2874  goto err_out_now;
2875  }
2876  tmp_ino->i_ino = FILE_MFT;
2877  insert_inode_hash(tmp_ino);
2878  if (ntfs_read_inode_mount(tmp_ino) < 0) {
2879  if (!silent)
2880  ntfs_error(sb, "Failed to load essential metadata.");
2881  goto iput_tmp_ino_err_out_now;
2882  }
2883  mutex_lock(&ntfs_lock);
2884  /*
2885  * The current mount is a compression user if the cluster size is
2886  * less than or equal 4kiB.
2887  */
2888  if (vol->cluster_size <= 4096 && !ntfs_nr_compression_users++) {
2889  result = allocate_compression_buffers();
2890  if (result) {
2891  ntfs_error(NULL, "Failed to allocate buffers "
2892  "for compression engine.");
2893  ntfs_nr_compression_users--;
2894  mutex_unlock(&ntfs_lock);
2895  goto iput_tmp_ino_err_out_now;
2896  }
2897  }
2898  /*
2899  * Generate the global default upcase table if necessary. Also
2900  * temporarily increment the number of upcase users to avoid race
2901  * conditions with concurrent (u)mounts.
2902  */
2903  if (!default_upcase)
2904  default_upcase = generate_default_upcase();
2905  ntfs_nr_upcase_users++;
2906  mutex_unlock(&ntfs_lock);
2907  /*
2908  * From now on, ignore @silent parameter. If we fail below this line,
2909  * it will be due to a corrupt fs or a system error, so we report it.
2910  */
2911  /*
2912  * Open the system files with normal access functions and complete
2913  * setting up the ntfs super block.
2914  */
2915  if (!load_system_files(vol)) {
2916  ntfs_error(sb, "Failed to load system files.");
2917  goto unl_upcase_iput_tmp_ino_err_out_now;
2918  }
2919 
2920  /* We grab a reference, simulating an ntfs_iget(). */
2921  ihold(vol->root_ino);
2922  if ((sb->s_root = d_make_root(vol->root_ino))) {
2923  ntfs_debug("Exiting, status successful.");
2924  /* Release the default upcase if it has no users. */
2925  mutex_lock(&ntfs_lock);
2926  if (!--ntfs_nr_upcase_users && default_upcase) {
2927  ntfs_free(default_upcase);
2928  default_upcase = NULL;
2929  }
2930  mutex_unlock(&ntfs_lock);
2931  sb->s_export_op = &ntfs_export_ops;
2932  lockdep_on();
2933  return 0;
2934  }
2935  ntfs_error(sb, "Failed to allocate root directory.");
2936  /* Clean up after the successful load_system_files() call from above. */
2937  // TODO: Use ntfs_put_super() instead of repeating all this code...
2938  // FIXME: Should mark the volume clean as the error is most likely
2939  // -ENOMEM.
2940  iput(vol->vol_ino);
2941  vol->vol_ino = NULL;
2942  /* NTFS 3.0+ specific clean up. */
2943  if (vol->major_ver >= 3) {
2944 #ifdef NTFS_RW
2945  if (vol->usnjrnl_j_ino) {
2946  iput(vol->usnjrnl_j_ino);
2947  vol->usnjrnl_j_ino = NULL;
2948  }
2949  if (vol->usnjrnl_max_ino) {
2950  iput(vol->usnjrnl_max_ino);
2951  vol->usnjrnl_max_ino = NULL;
2952  }
2953  if (vol->usnjrnl_ino) {
2954  iput(vol->usnjrnl_ino);
2955  vol->usnjrnl_ino = NULL;
2956  }
2957  if (vol->quota_q_ino) {
2958  iput(vol->quota_q_ino);
2959  vol->quota_q_ino = NULL;
2960  }
2961  if (vol->quota_ino) {
2962  iput(vol->quota_ino);
2963  vol->quota_ino = NULL;
2964  }
2965 #endif /* NTFS_RW */
2966  if (vol->extend_ino) {
2967  iput(vol->extend_ino);
2968  vol->extend_ino = NULL;
2969  }
2970  if (vol->secure_ino) {
2971  iput(vol->secure_ino);
2972  vol->secure_ino = NULL;
2973  }
2974  }
2975  iput(vol->root_ino);
2976  vol->root_ino = NULL;
2977  iput(vol->lcnbmp_ino);
2978  vol->lcnbmp_ino = NULL;
2979  iput(vol->mftbmp_ino);
2980  vol->mftbmp_ino = NULL;
2981 #ifdef NTFS_RW
2982  if (vol->logfile_ino) {
2983  iput(vol->logfile_ino);
2984  vol->logfile_ino = NULL;
2985  }
2986  if (vol->mftmirr_ino) {
2987  iput(vol->mftmirr_ino);
2988  vol->mftmirr_ino = NULL;
2989  }
2990 #endif /* NTFS_RW */
2991  /* Throw away the table of attribute definitions. */
2992  vol->attrdef_size = 0;
2993  if (vol->attrdef) {
2994  ntfs_free(vol->attrdef);
2995  vol->attrdef = NULL;
2996  }
2997  vol->upcase_len = 0;
2998  mutex_lock(&ntfs_lock);
2999  if (vol->upcase == default_upcase) {
3000  ntfs_nr_upcase_users--;
3001  vol->upcase = NULL;
3002  }
3003  mutex_unlock(&ntfs_lock);
3004  if (vol->upcase) {
3005  ntfs_free(vol->upcase);
3006  vol->upcase = NULL;
3007  }
3008  if (vol->nls_map) {
3009  unload_nls(vol->nls_map);
3010  vol->nls_map = NULL;
3011  }
3012  /* Error exit code path. */
3013 unl_upcase_iput_tmp_ino_err_out_now:
3014  /*
3015  * Decrease the number of upcase users and destroy the global default
3016  * upcase table if necessary.
3017  */
3018  mutex_lock(&ntfs_lock);
3019  if (!--ntfs_nr_upcase_users && default_upcase) {
3020  ntfs_free(default_upcase);
3021  default_upcase = NULL;
3022  }
3023  if (vol->cluster_size <= 4096 && !--ntfs_nr_compression_users)
3024  free_compression_buffers();
3025  mutex_unlock(&ntfs_lock);
3026 iput_tmp_ino_err_out_now:
3027  iput(tmp_ino);
3028  if (vol->mft_ino && vol->mft_ino != tmp_ino)
3029  iput(vol->mft_ino);
3030  vol->mft_ino = NULL;
3031  /* Errors at this stage are irrelevant. */
3032 err_out_now:
3033  sb->s_fs_info = NULL;
3034  kfree(vol);
3035  ntfs_debug("Failed, returning -EINVAL.");
3036  lockdep_on();
3037  return -EINVAL;
3038 }
3039 
3040 /*
3041  * This is a slab cache to optimize allocations and deallocations of Unicode
3042  * strings of the maximum length allowed by NTFS, which is NTFS_MAX_NAME_LEN
3043  * (255) Unicode characters + a terminating NULL Unicode character.
3044  */
3045 struct kmem_cache *ntfs_name_cache;
3046 
3047 /* Slab caches for efficient allocation/deallocation of inodes. */
3048 struct kmem_cache *ntfs_inode_cache;
3049 struct kmem_cache *ntfs_big_inode_cache;
3050 
3051 /* Init once constructor for the inode slab cache. */
3052 static void ntfs_big_inode_init_once(void *foo)
3053 {
3054  ntfs_inode *ni = (ntfs_inode *)foo;
3055 
3056  inode_init_once(VFS_I(ni));
3057 }
3058 
3059 /*
3060  * Slab caches to optimize allocations and deallocations of attribute search
3061  * contexts and index contexts, respectively.
3062  */
3063 struct kmem_cache *ntfs_attr_ctx_cache;
3064 struct kmem_cache *ntfs_index_ctx_cache;
3065 
3066 /* Driver wide mutex. */
3067 DEFINE_MUTEX(ntfs_lock);
3068 
3069 static struct dentry *ntfs_mount(struct file_system_type *fs_type,
3070  int flags, const char *dev_name, void *data)
3071 {
3072  return mount_bdev(fs_type, flags, dev_name, data, ntfs_fill_super);
3073 }
3074 
3075 static struct file_system_type ntfs_fs_type = {
3076  .owner = THIS_MODULE,
3077  .name = "ntfs",
3078  .mount = ntfs_mount,
3079  .kill_sb = kill_block_super,
3080  .fs_flags = FS_REQUIRES_DEV,
3081 };
3082 
3083 /* Stable names for the slab caches. */
3084 static const char ntfs_index_ctx_cache_name[] = "ntfs_index_ctx_cache";
3085 static const char ntfs_attr_ctx_cache_name[] = "ntfs_attr_ctx_cache";
3086 static const char ntfs_name_cache_name[] = "ntfs_name_cache";
3087 static const char ntfs_inode_cache_name[] = "ntfs_inode_cache";
3088 static const char ntfs_big_inode_cache_name[] = "ntfs_big_inode_cache";
3089 
3090 static int __init init_ntfs_fs(void)
3091 {
3092  int err = 0;
3093 
3094  /* This may be ugly but it results in pretty output so who cares. (-8 */
3095  printk(KERN_INFO "NTFS driver " NTFS_VERSION " [Flags: R/"
3096 #ifdef NTFS_RW
3097  "W"
3098 #else
3099  "O"
3100 #endif
3101 #ifdef DEBUG
3102  " DEBUG"
3103 #endif
3104 #ifdef MODULE
3105  " MODULE"
3106 #endif
3107  "].\n");
3108 
3109  ntfs_debug("Debug messages are enabled.");
3110 
3111  ntfs_index_ctx_cache = kmem_cache_create(ntfs_index_ctx_cache_name,
3112  sizeof(ntfs_index_context), 0 /* offset */,
3113  SLAB_HWCACHE_ALIGN, NULL /* ctor */);
3114  if (!ntfs_index_ctx_cache) {
3115  printk(KERN_CRIT "NTFS: Failed to create %s!\n",
3116  ntfs_index_ctx_cache_name);
3117  goto ictx_err_out;
3118  }
3119  ntfs_attr_ctx_cache = kmem_cache_create(ntfs_attr_ctx_cache_name,
3120  sizeof(ntfs_attr_search_ctx), 0 /* offset */,
3121  SLAB_HWCACHE_ALIGN, NULL /* ctor */);
3122  if (!ntfs_attr_ctx_cache) {
3123  printk(KERN_CRIT "NTFS: Failed to create %s!\n",
3124  ntfs_attr_ctx_cache_name);
3125  goto actx_err_out;
3126  }
3127 
3128  ntfs_name_cache = kmem_cache_create(ntfs_name_cache_name,
3129  (NTFS_MAX_NAME_LEN+1) * sizeof(ntfschar), 0,
3130  SLAB_HWCACHE_ALIGN, NULL);
3131  if (!ntfs_name_cache) {
3132  printk(KERN_CRIT "NTFS: Failed to create %s!\n",
3133  ntfs_name_cache_name);
3134  goto name_err_out;
3135  }
3136 
3137  ntfs_inode_cache = kmem_cache_create(ntfs_inode_cache_name,
3138  sizeof(ntfs_inode), 0,
3139  SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, NULL);
3140  if (!ntfs_inode_cache) {
3141  printk(KERN_CRIT "NTFS: Failed to create %s!\n",
3142  ntfs_inode_cache_name);
3143  goto inode_err_out;
3144  }
3145 
3146  ntfs_big_inode_cache = kmem_cache_create(ntfs_big_inode_cache_name,
3147  sizeof(big_ntfs_inode), 0,
3148  SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
3149  ntfs_big_inode_init_once);
3150  if (!ntfs_big_inode_cache) {
3151  printk(KERN_CRIT "NTFS: Failed to create %s!\n",
3152  ntfs_big_inode_cache_name);
3153  goto big_inode_err_out;
3154  }
3155 
3156  /* Register the ntfs sysctls. */
3157  err = ntfs_sysctl(1);
3158  if (err) {
3159  printk(KERN_CRIT "NTFS: Failed to register NTFS sysctls!\n");
3160  goto sysctl_err_out;
3161  }
3162 
3163  err = register_filesystem(&ntfs_fs_type);
3164  if (!err) {
3165  ntfs_debug("NTFS driver registered successfully.");
3166  return 0; /* Success! */
3167  }
3168  printk(KERN_CRIT "NTFS: Failed to register NTFS filesystem driver!\n");
3169 
3170  /* Unregister the ntfs sysctls. */
3171  ntfs_sysctl(0);
3172 sysctl_err_out:
3173  kmem_cache_destroy(ntfs_big_inode_cache);
3174 big_inode_err_out:
3175  kmem_cache_destroy(ntfs_inode_cache);
3176 inode_err_out:
3177  kmem_cache_destroy(ntfs_name_cache);
3178 name_err_out:
3179  kmem_cache_destroy(ntfs_attr_ctx_cache);
3180 actx_err_out:
3181  kmem_cache_destroy(ntfs_index_ctx_cache);
3182 ictx_err_out:
3183  if (!err) {
3184  printk(KERN_CRIT "NTFS: Aborting NTFS filesystem driver "
3185  "registration...\n");
3186  err = -ENOMEM;
3187  }
3188  return err;
3189 }
3190 
3191 static void __exit exit_ntfs_fs(void)
3192 {
3193  ntfs_debug("Unregistering NTFS driver.");
3194 
3195  unregister_filesystem(&ntfs_fs_type);
3196 
3197  /*
3198  * Make sure all delayed rcu free inodes are flushed before we
3199  * destroy cache.
3200  */
3201  rcu_barrier();
3202  kmem_cache_destroy(ntfs_big_inode_cache);
3203  kmem_cache_destroy(ntfs_inode_cache);
3204  kmem_cache_destroy(ntfs_name_cache);
3205  kmem_cache_destroy(ntfs_attr_ctx_cache);
3206  kmem_cache_destroy(ntfs_index_ctx_cache);
3207  /* Unregister the ntfs sysctls. */
3208  ntfs_sysctl(0);
3209 }
3210 
3211 MODULE_AUTHOR("Anton Altaparmakov <[email protected]>");
3212 MODULE_DESCRIPTION("NTFS 1.2/3.x driver - Copyright (c) 2001-2011 Anton Altaparmakov and Tuxera Inc.");
3213 MODULE_VERSION(NTFS_VERSION);
3214 MODULE_LICENSE("GPL");
3215 #ifdef DEBUG
3216 module_param(debug_msgs, bint, 0);
3217 MODULE_PARM_DESC(debug_msgs, "Enable debug messages.");
3218 #endif
3219 
3220 module_init(init_ntfs_fs)
3221 module_exit(exit_ntfs_fs)
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