super.c 103 KB

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  1. /*
  2. * super.c - NTFS kernel super block handling. Part of the Linux-NTFS project.
  3. *
  4. * Copyright (c) 2001-2007 Anton Altaparmakov
  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. #include <linux/stddef.h>
  23. #include <linux/init.h>
  24. #include <linux/slab.h>
  25. #include <linux/string.h>
  26. #include <linux/spinlock.h>
  27. #include <linux/blkdev.h> /* For bdev_hardsect_size(). */
  28. #include <linux/backing-dev.h>
  29. #include <linux/buffer_head.h>
  30. #include <linux/vfs.h>
  31. #include <linux/moduleparam.h>
  32. #include <linux/smp_lock.h>
  33. #include "sysctl.h"
  34. #include "logfile.h"
  35. #include "quota.h"
  36. #include "usnjrnl.h"
  37. #include "dir.h"
  38. #include "debug.h"
  39. #include "index.h"
  40. #include "aops.h"
  41. #include "layout.h"
  42. #include "malloc.h"
  43. #include "ntfs.h"
  44. /* Number of mounted filesystems which have compression enabled. */
  45. static unsigned long ntfs_nr_compression_users;
  46. /* A global default upcase table and a corresponding reference count. */
  47. static ntfschar *default_upcase = NULL;
  48. static unsigned long ntfs_nr_upcase_users = 0;
  49. /* Error constants/strings used in inode.c::ntfs_show_options(). */
  50. typedef enum {
  51. /* One of these must be present, default is ON_ERRORS_CONTINUE. */
  52. ON_ERRORS_PANIC = 0x01,
  53. ON_ERRORS_REMOUNT_RO = 0x02,
  54. ON_ERRORS_CONTINUE = 0x04,
  55. /* Optional, can be combined with any of the above. */
  56. ON_ERRORS_RECOVER = 0x10,
  57. } ON_ERRORS_ACTIONS;
  58. const option_t on_errors_arr[] = {
  59. { ON_ERRORS_PANIC, "panic" },
  60. { ON_ERRORS_REMOUNT_RO, "remount-ro", },
  61. { ON_ERRORS_CONTINUE, "continue", },
  62. { ON_ERRORS_RECOVER, "recover" },
  63. { 0, NULL }
  64. };
  65. /**
  66. * simple_getbool -
  67. *
  68. * Copied from old ntfs driver (which copied from vfat driver).
  69. */
  70. static int simple_getbool(char *s, bool *setval)
  71. {
  72. if (s) {
  73. if (!strcmp(s, "1") || !strcmp(s, "yes") || !strcmp(s, "true"))
  74. *setval = true;
  75. else if (!strcmp(s, "0") || !strcmp(s, "no") ||
  76. !strcmp(s, "false"))
  77. *setval = false;
  78. else
  79. return 0;
  80. } else
  81. *setval = true;
  82. return 1;
  83. }
  84. /**
  85. * parse_options - parse the (re)mount options
  86. * @vol: ntfs volume
  87. * @opt: string containing the (re)mount options
  88. *
  89. * Parse the recognized options in @opt for the ntfs volume described by @vol.
  90. */
  91. static bool parse_options(ntfs_volume *vol, char *opt)
  92. {
  93. char *p, *v, *ov;
  94. static char *utf8 = "utf8";
  95. int errors = 0, sloppy = 0;
  96. uid_t uid = (uid_t)-1;
  97. gid_t gid = (gid_t)-1;
  98. mode_t fmask = (mode_t)-1, dmask = (mode_t)-1;
  99. int mft_zone_multiplier = -1, on_errors = -1;
  100. int show_sys_files = -1, case_sensitive = -1, disable_sparse = -1;
  101. struct nls_table *nls_map = NULL, *old_nls;
  102. /* I am lazy... (-8 */
  103. #define NTFS_GETOPT_WITH_DEFAULT(option, variable, default_value) \
  104. if (!strcmp(p, option)) { \
  105. if (!v || !*v) \
  106. variable = default_value; \
  107. else { \
  108. variable = simple_strtoul(ov = v, &v, 0); \
  109. if (*v) \
  110. goto needs_val; \
  111. } \
  112. }
  113. #define NTFS_GETOPT(option, variable) \
  114. if (!strcmp(p, option)) { \
  115. if (!v || !*v) \
  116. goto needs_arg; \
  117. variable = simple_strtoul(ov = v, &v, 0); \
  118. if (*v) \
  119. goto needs_val; \
  120. }
  121. #define NTFS_GETOPT_OCTAL(option, variable) \
  122. if (!strcmp(p, option)) { \
  123. if (!v || !*v) \
  124. goto needs_arg; \
  125. variable = simple_strtoul(ov = v, &v, 8); \
  126. if (*v) \
  127. goto needs_val; \
  128. }
  129. #define NTFS_GETOPT_BOOL(option, variable) \
  130. if (!strcmp(p, option)) { \
  131. bool val; \
  132. if (!simple_getbool(v, &val)) \
  133. goto needs_bool; \
  134. variable = val; \
  135. }
  136. #define NTFS_GETOPT_OPTIONS_ARRAY(option, variable, opt_array) \
  137. if (!strcmp(p, option)) { \
  138. int _i; \
  139. if (!v || !*v) \
  140. goto needs_arg; \
  141. ov = v; \
  142. if (variable == -1) \
  143. variable = 0; \
  144. for (_i = 0; opt_array[_i].str && *opt_array[_i].str; _i++) \
  145. if (!strcmp(opt_array[_i].str, v)) { \
  146. variable |= opt_array[_i].val; \
  147. break; \
  148. } \
  149. if (!opt_array[_i].str || !*opt_array[_i].str) \
  150. goto needs_val; \
  151. }
  152. if (!opt || !*opt)
  153. goto no_mount_options;
  154. ntfs_debug("Entering with mount options string: %s", opt);
  155. while ((p = strsep(&opt, ","))) {
  156. if ((v = strchr(p, '=')))
  157. *v++ = 0;
  158. NTFS_GETOPT("uid", uid)
  159. else NTFS_GETOPT("gid", gid)
  160. else NTFS_GETOPT_OCTAL("umask", fmask = dmask)
  161. else NTFS_GETOPT_OCTAL("fmask", fmask)
  162. else NTFS_GETOPT_OCTAL("dmask", dmask)
  163. else NTFS_GETOPT("mft_zone_multiplier", mft_zone_multiplier)
  164. else NTFS_GETOPT_WITH_DEFAULT("sloppy", sloppy, true)
  165. else NTFS_GETOPT_BOOL("show_sys_files", show_sys_files)
  166. else NTFS_GETOPT_BOOL("case_sensitive", case_sensitive)
  167. else NTFS_GETOPT_BOOL("disable_sparse", disable_sparse)
  168. else NTFS_GETOPT_OPTIONS_ARRAY("errors", on_errors,
  169. on_errors_arr)
  170. else if (!strcmp(p, "posix") || !strcmp(p, "show_inodes"))
  171. ntfs_warning(vol->sb, "Ignoring obsolete option %s.",
  172. p);
  173. else if (!strcmp(p, "nls") || !strcmp(p, "iocharset")) {
  174. if (!strcmp(p, "iocharset"))
  175. ntfs_warning(vol->sb, "Option iocharset is "
  176. "deprecated. Please use "
  177. "option nls=<charsetname> in "
  178. "the future.");
  179. if (!v || !*v)
  180. goto needs_arg;
  181. use_utf8:
  182. old_nls = nls_map;
  183. nls_map = load_nls(v);
  184. if (!nls_map) {
  185. if (!old_nls) {
  186. ntfs_error(vol->sb, "NLS character set "
  187. "%s not found.", v);
  188. return false;
  189. }
  190. ntfs_error(vol->sb, "NLS character set %s not "
  191. "found. Using previous one %s.",
  192. v, old_nls->charset);
  193. nls_map = old_nls;
  194. } else /* nls_map */ {
  195. if (old_nls)
  196. unload_nls(old_nls);
  197. }
  198. } else if (!strcmp(p, "utf8")) {
  199. bool val = false;
  200. ntfs_warning(vol->sb, "Option utf8 is no longer "
  201. "supported, using option nls=utf8. Please "
  202. "use option nls=utf8 in the future and "
  203. "make sure utf8 is compiled either as a "
  204. "module or into the kernel.");
  205. if (!v || !*v)
  206. val = true;
  207. else if (!simple_getbool(v, &val))
  208. goto needs_bool;
  209. if (val) {
  210. v = utf8;
  211. goto use_utf8;
  212. }
  213. } else {
  214. ntfs_error(vol->sb, "Unrecognized mount option %s.", p);
  215. if (errors < INT_MAX)
  216. errors++;
  217. }
  218. #undef NTFS_GETOPT_OPTIONS_ARRAY
  219. #undef NTFS_GETOPT_BOOL
  220. #undef NTFS_GETOPT
  221. #undef NTFS_GETOPT_WITH_DEFAULT
  222. }
  223. no_mount_options:
  224. if (errors && !sloppy)
  225. return false;
  226. if (sloppy)
  227. ntfs_warning(vol->sb, "Sloppy option given. Ignoring "
  228. "unrecognized mount option(s) and continuing.");
  229. /* Keep this first! */
  230. if (on_errors != -1) {
  231. if (!on_errors) {
  232. ntfs_error(vol->sb, "Invalid errors option argument "
  233. "or bug in options parser.");
  234. return false;
  235. }
  236. }
  237. if (nls_map) {
  238. if (vol->nls_map && vol->nls_map != nls_map) {
  239. ntfs_error(vol->sb, "Cannot change NLS character set "
  240. "on remount.");
  241. return false;
  242. } /* else (!vol->nls_map) */
  243. ntfs_debug("Using NLS character set %s.", nls_map->charset);
  244. vol->nls_map = nls_map;
  245. } else /* (!nls_map) */ {
  246. if (!vol->nls_map) {
  247. vol->nls_map = load_nls_default();
  248. if (!vol->nls_map) {
  249. ntfs_error(vol->sb, "Failed to load default "
  250. "NLS character set.");
  251. return false;
  252. }
  253. ntfs_debug("Using default NLS character set (%s).",
  254. vol->nls_map->charset);
  255. }
  256. }
  257. if (mft_zone_multiplier != -1) {
  258. if (vol->mft_zone_multiplier && vol->mft_zone_multiplier !=
  259. mft_zone_multiplier) {
  260. ntfs_error(vol->sb, "Cannot change mft_zone_multiplier "
  261. "on remount.");
  262. return false;
  263. }
  264. if (mft_zone_multiplier < 1 || mft_zone_multiplier > 4) {
  265. ntfs_error(vol->sb, "Invalid mft_zone_multiplier. "
  266. "Using default value, i.e. 1.");
  267. mft_zone_multiplier = 1;
  268. }
  269. vol->mft_zone_multiplier = mft_zone_multiplier;
  270. }
  271. if (!vol->mft_zone_multiplier)
  272. vol->mft_zone_multiplier = 1;
  273. if (on_errors != -1)
  274. vol->on_errors = on_errors;
  275. if (!vol->on_errors || vol->on_errors == ON_ERRORS_RECOVER)
  276. vol->on_errors |= ON_ERRORS_CONTINUE;
  277. if (uid != (uid_t)-1)
  278. vol->uid = uid;
  279. if (gid != (gid_t)-1)
  280. vol->gid = gid;
  281. if (fmask != (mode_t)-1)
  282. vol->fmask = fmask;
  283. if (dmask != (mode_t)-1)
  284. vol->dmask = dmask;
  285. if (show_sys_files != -1) {
  286. if (show_sys_files)
  287. NVolSetShowSystemFiles(vol);
  288. else
  289. NVolClearShowSystemFiles(vol);
  290. }
  291. if (case_sensitive != -1) {
  292. if (case_sensitive)
  293. NVolSetCaseSensitive(vol);
  294. else
  295. NVolClearCaseSensitive(vol);
  296. }
  297. if (disable_sparse != -1) {
  298. if (disable_sparse)
  299. NVolClearSparseEnabled(vol);
  300. else {
  301. if (!NVolSparseEnabled(vol) &&
  302. vol->major_ver && vol->major_ver < 3)
  303. ntfs_warning(vol->sb, "Not enabling sparse "
  304. "support due to NTFS volume "
  305. "version %i.%i (need at least "
  306. "version 3.0).", vol->major_ver,
  307. vol->minor_ver);
  308. else
  309. NVolSetSparseEnabled(vol);
  310. }
  311. }
  312. return true;
  313. needs_arg:
  314. ntfs_error(vol->sb, "The %s option requires an argument.", p);
  315. return false;
  316. needs_bool:
  317. ntfs_error(vol->sb, "The %s option requires a boolean argument.", p);
  318. return false;
  319. needs_val:
  320. ntfs_error(vol->sb, "Invalid %s option argument: %s", p, ov);
  321. return false;
  322. }
  323. #ifdef NTFS_RW
  324. /**
  325. * ntfs_write_volume_flags - write new flags to the volume information flags
  326. * @vol: ntfs volume on which to modify the flags
  327. * @flags: new flags value for the volume information flags
  328. *
  329. * Internal function. You probably want to use ntfs_{set,clear}_volume_flags()
  330. * instead (see below).
  331. *
  332. * Replace the volume information flags on the volume @vol with the value
  333. * supplied in @flags. Note, this overwrites the volume information flags, so
  334. * make sure to combine the flags you want to modify with the old flags and use
  335. * the result when calling ntfs_write_volume_flags().
  336. *
  337. * Return 0 on success and -errno on error.
  338. */
  339. static int ntfs_write_volume_flags(ntfs_volume *vol, const VOLUME_FLAGS flags)
  340. {
  341. ntfs_inode *ni = NTFS_I(vol->vol_ino);
  342. MFT_RECORD *m;
  343. VOLUME_INFORMATION *vi;
  344. ntfs_attr_search_ctx *ctx;
  345. int err;
  346. ntfs_debug("Entering, old flags = 0x%x, new flags = 0x%x.",
  347. le16_to_cpu(vol->vol_flags), le16_to_cpu(flags));
  348. if (vol->vol_flags == flags)
  349. goto done;
  350. BUG_ON(!ni);
  351. m = map_mft_record(ni);
  352. if (IS_ERR(m)) {
  353. err = PTR_ERR(m);
  354. goto err_out;
  355. }
  356. ctx = ntfs_attr_get_search_ctx(ni, m);
  357. if (!ctx) {
  358. err = -ENOMEM;
  359. goto put_unm_err_out;
  360. }
  361. err = ntfs_attr_lookup(AT_VOLUME_INFORMATION, NULL, 0, 0, 0, NULL, 0,
  362. ctx);
  363. if (err)
  364. goto put_unm_err_out;
  365. vi = (VOLUME_INFORMATION*)((u8*)ctx->attr +
  366. le16_to_cpu(ctx->attr->data.resident.value_offset));
  367. vol->vol_flags = vi->flags = flags;
  368. flush_dcache_mft_record_page(ctx->ntfs_ino);
  369. mark_mft_record_dirty(ctx->ntfs_ino);
  370. ntfs_attr_put_search_ctx(ctx);
  371. unmap_mft_record(ni);
  372. done:
  373. ntfs_debug("Done.");
  374. return 0;
  375. put_unm_err_out:
  376. if (ctx)
  377. ntfs_attr_put_search_ctx(ctx);
  378. unmap_mft_record(ni);
  379. err_out:
  380. ntfs_error(vol->sb, "Failed with error code %i.", -err);
  381. return err;
  382. }
  383. /**
  384. * ntfs_set_volume_flags - set bits in the volume information flags
  385. * @vol: ntfs volume on which to modify the flags
  386. * @flags: flags to set on the volume
  387. *
  388. * Set the bits in @flags in the volume information flags on the volume @vol.
  389. *
  390. * Return 0 on success and -errno on error.
  391. */
  392. static inline int ntfs_set_volume_flags(ntfs_volume *vol, VOLUME_FLAGS flags)
  393. {
  394. flags &= VOLUME_FLAGS_MASK;
  395. return ntfs_write_volume_flags(vol, vol->vol_flags | flags);
  396. }
  397. /**
  398. * ntfs_clear_volume_flags - clear bits in the volume information flags
  399. * @vol: ntfs volume on which to modify the flags
  400. * @flags: flags to clear on the volume
  401. *
  402. * Clear the bits in @flags in the volume information flags on the volume @vol.
  403. *
  404. * Return 0 on success and -errno on error.
  405. */
  406. static inline int ntfs_clear_volume_flags(ntfs_volume *vol, VOLUME_FLAGS flags)
  407. {
  408. flags &= VOLUME_FLAGS_MASK;
  409. flags = vol->vol_flags & cpu_to_le16(~le16_to_cpu(flags));
  410. return ntfs_write_volume_flags(vol, flags);
  411. }
  412. #endif /* NTFS_RW */
  413. /**
  414. * ntfs_remount - change the mount options of a mounted ntfs filesystem
  415. * @sb: superblock of mounted ntfs filesystem
  416. * @flags: remount flags
  417. * @opt: remount options string
  418. *
  419. * Change the mount options of an already mounted ntfs filesystem.
  420. *
  421. * NOTE: The VFS sets the @sb->s_flags remount flags to @flags after
  422. * ntfs_remount() returns successfully (i.e. returns 0). Otherwise,
  423. * @sb->s_flags are not changed.
  424. */
  425. static int ntfs_remount(struct super_block *sb, int *flags, char *opt)
  426. {
  427. ntfs_volume *vol = NTFS_SB(sb);
  428. ntfs_debug("Entering with remount options string: %s", opt);
  429. #ifndef NTFS_RW
  430. /* For read-only compiled driver, enforce read-only flag. */
  431. *flags |= MS_RDONLY;
  432. #else /* NTFS_RW */
  433. /*
  434. * For the read-write compiled driver, if we are remounting read-write,
  435. * make sure there are no volume errors and that no unsupported volume
  436. * flags are set. Also, empty the logfile journal as it would become
  437. * stale as soon as something is written to the volume and mark the
  438. * volume dirty so that chkdsk is run if the volume is not umounted
  439. * cleanly. Finally, mark the quotas out of date so Windows rescans
  440. * the volume on boot and updates them.
  441. *
  442. * When remounting read-only, mark the volume clean if no volume errors
  443. * have occured.
  444. */
  445. if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
  446. static const char *es = ". Cannot remount read-write.";
  447. /* Remounting read-write. */
  448. if (NVolErrors(vol)) {
  449. ntfs_error(sb, "Volume has errors and is read-only%s",
  450. es);
  451. return -EROFS;
  452. }
  453. if (vol->vol_flags & VOLUME_IS_DIRTY) {
  454. ntfs_error(sb, "Volume is dirty and read-only%s", es);
  455. return -EROFS;
  456. }
  457. if (vol->vol_flags & VOLUME_MODIFIED_BY_CHKDSK) {
  458. ntfs_error(sb, "Volume has been modified by chkdsk "
  459. "and is read-only%s", es);
  460. return -EROFS;
  461. }
  462. if (vol->vol_flags & VOLUME_MUST_MOUNT_RO_MASK) {
  463. ntfs_error(sb, "Volume has unsupported flags set "
  464. "(0x%x) and is read-only%s",
  465. (unsigned)le16_to_cpu(vol->vol_flags),
  466. es);
  467. return -EROFS;
  468. }
  469. if (ntfs_set_volume_flags(vol, VOLUME_IS_DIRTY)) {
  470. ntfs_error(sb, "Failed to set dirty bit in volume "
  471. "information flags%s", es);
  472. return -EROFS;
  473. }
  474. #if 0
  475. // TODO: Enable this code once we start modifying anything that
  476. // is different between NTFS 1.2 and 3.x...
  477. /* Set NT4 compatibility flag on newer NTFS version volumes. */
  478. if ((vol->major_ver > 1)) {
  479. if (ntfs_set_volume_flags(vol, VOLUME_MOUNTED_ON_NT4)) {
  480. ntfs_error(sb, "Failed to set NT4 "
  481. "compatibility flag%s", es);
  482. NVolSetErrors(vol);
  483. return -EROFS;
  484. }
  485. }
  486. #endif
  487. if (!ntfs_empty_logfile(vol->logfile_ino)) {
  488. ntfs_error(sb, "Failed to empty journal $LogFile%s",
  489. es);
  490. NVolSetErrors(vol);
  491. return -EROFS;
  492. }
  493. if (!ntfs_mark_quotas_out_of_date(vol)) {
  494. ntfs_error(sb, "Failed to mark quotas out of date%s",
  495. es);
  496. NVolSetErrors(vol);
  497. return -EROFS;
  498. }
  499. if (!ntfs_stamp_usnjrnl(vol)) {
  500. ntfs_error(sb, "Failed to stamp transation log "
  501. "($UsnJrnl)%s", es);
  502. NVolSetErrors(vol);
  503. return -EROFS;
  504. }
  505. } else if (!(sb->s_flags & MS_RDONLY) && (*flags & MS_RDONLY)) {
  506. /* Remounting read-only. */
  507. if (!NVolErrors(vol)) {
  508. if (ntfs_clear_volume_flags(vol, VOLUME_IS_DIRTY))
  509. ntfs_warning(sb, "Failed to clear dirty bit "
  510. "in volume information "
  511. "flags. Run chkdsk.");
  512. }
  513. }
  514. #endif /* NTFS_RW */
  515. // TODO: Deal with *flags.
  516. if (!parse_options(vol, opt))
  517. return -EINVAL;
  518. ntfs_debug("Done.");
  519. return 0;
  520. }
  521. /**
  522. * is_boot_sector_ntfs - check whether a boot sector is a valid NTFS boot sector
  523. * @sb: Super block of the device to which @b belongs.
  524. * @b: Boot sector of device @sb to check.
  525. * @silent: If 'true', all output will be silenced.
  526. *
  527. * is_boot_sector_ntfs() checks whether the boot sector @b is a valid NTFS boot
  528. * sector. Returns 'true' if it is valid and 'false' if not.
  529. *
  530. * @sb is only needed for warning/error output, i.e. it can be NULL when silent
  531. * is 'true'.
  532. */
  533. static bool is_boot_sector_ntfs(const struct super_block *sb,
  534. const NTFS_BOOT_SECTOR *b, const bool silent)
  535. {
  536. /*
  537. * Check that checksum == sum of u32 values from b to the checksum
  538. * field. If checksum is zero, no checking is done. We will work when
  539. * the checksum test fails, since some utilities update the boot sector
  540. * ignoring the checksum which leaves the checksum out-of-date. We
  541. * report a warning if this is the case.
  542. */
  543. if ((void*)b < (void*)&b->checksum && b->checksum && !silent) {
  544. le32 *u;
  545. u32 i;
  546. for (i = 0, u = (le32*)b; u < (le32*)(&b->checksum); ++u)
  547. i += le32_to_cpup(u);
  548. if (le32_to_cpu(b->checksum) != i)
  549. ntfs_warning(sb, "Invalid boot sector checksum.");
  550. }
  551. /* Check OEMidentifier is "NTFS " */
  552. if (b->oem_id != magicNTFS)
  553. goto not_ntfs;
  554. /* Check bytes per sector value is between 256 and 4096. */
  555. if (le16_to_cpu(b->bpb.bytes_per_sector) < 0x100 ||
  556. le16_to_cpu(b->bpb.bytes_per_sector) > 0x1000)
  557. goto not_ntfs;
  558. /* Check sectors per cluster value is valid. */
  559. switch (b->bpb.sectors_per_cluster) {
  560. case 1: case 2: case 4: case 8: case 16: case 32: case 64: case 128:
  561. break;
  562. default:
  563. goto not_ntfs;
  564. }
  565. /* Check the cluster size is not above the maximum (64kiB). */
  566. if ((u32)le16_to_cpu(b->bpb.bytes_per_sector) *
  567. b->bpb.sectors_per_cluster > NTFS_MAX_CLUSTER_SIZE)
  568. goto not_ntfs;
  569. /* Check reserved/unused fields are really zero. */
  570. if (le16_to_cpu(b->bpb.reserved_sectors) ||
  571. le16_to_cpu(b->bpb.root_entries) ||
  572. le16_to_cpu(b->bpb.sectors) ||
  573. le16_to_cpu(b->bpb.sectors_per_fat) ||
  574. le32_to_cpu(b->bpb.large_sectors) || b->bpb.fats)
  575. goto not_ntfs;
  576. /* Check clusters per file mft record value is valid. */
  577. if ((u8)b->clusters_per_mft_record < 0xe1 ||
  578. (u8)b->clusters_per_mft_record > 0xf7)
  579. switch (b->clusters_per_mft_record) {
  580. case 1: case 2: case 4: case 8: case 16: case 32: case 64:
  581. break;
  582. default:
  583. goto not_ntfs;
  584. }
  585. /* Check clusters per index block value is valid. */
  586. if ((u8)b->clusters_per_index_record < 0xe1 ||
  587. (u8)b->clusters_per_index_record > 0xf7)
  588. switch (b->clusters_per_index_record) {
  589. case 1: case 2: case 4: case 8: case 16: case 32: case 64:
  590. break;
  591. default:
  592. goto not_ntfs;
  593. }
  594. /*
  595. * Check for valid end of sector marker. We will work without it, but
  596. * many BIOSes will refuse to boot from a bootsector if the magic is
  597. * incorrect, so we emit a warning.
  598. */
  599. if (!silent && b->end_of_sector_marker != const_cpu_to_le16(0xaa55))
  600. ntfs_warning(sb, "Invalid end of sector marker.");
  601. return true;
  602. not_ntfs:
  603. return false;
  604. }
  605. /**
  606. * read_ntfs_boot_sector - read the NTFS boot sector of a device
  607. * @sb: super block of device to read the boot sector from
  608. * @silent: if true, suppress all output
  609. *
  610. * Reads the boot sector from the device and validates it. If that fails, tries
  611. * to read the backup boot sector, first from the end of the device a-la NT4 and
  612. * later and then from the middle of the device a-la NT3.51 and before.
  613. *
  614. * If a valid boot sector is found but it is not the primary boot sector, we
  615. * repair the primary boot sector silently (unless the device is read-only or
  616. * the primary boot sector is not accessible).
  617. *
  618. * NOTE: To call this function, @sb must have the fields s_dev, the ntfs super
  619. * block (u.ntfs_sb), nr_blocks and the device flags (s_flags) initialized
  620. * to their respective values.
  621. *
  622. * Return the unlocked buffer head containing the boot sector or NULL on error.
  623. */
  624. static struct buffer_head *read_ntfs_boot_sector(struct super_block *sb,
  625. const int silent)
  626. {
  627. const char *read_err_str = "Unable to read %s boot sector.";
  628. struct buffer_head *bh_primary, *bh_backup;
  629. sector_t nr_blocks = NTFS_SB(sb)->nr_blocks;
  630. /* Try to read primary boot sector. */
  631. if ((bh_primary = sb_bread(sb, 0))) {
  632. if (is_boot_sector_ntfs(sb, (NTFS_BOOT_SECTOR*)
  633. bh_primary->b_data, silent))
  634. return bh_primary;
  635. if (!silent)
  636. ntfs_error(sb, "Primary boot sector is invalid.");
  637. } else if (!silent)
  638. ntfs_error(sb, read_err_str, "primary");
  639. if (!(NTFS_SB(sb)->on_errors & ON_ERRORS_RECOVER)) {
  640. if (bh_primary)
  641. brelse(bh_primary);
  642. if (!silent)
  643. ntfs_error(sb, "Mount option errors=recover not used. "
  644. "Aborting without trying to recover.");
  645. return NULL;
  646. }
  647. /* Try to read NT4+ backup boot sector. */
  648. if ((bh_backup = sb_bread(sb, nr_blocks - 1))) {
  649. if (is_boot_sector_ntfs(sb, (NTFS_BOOT_SECTOR*)
  650. bh_backup->b_data, silent))
  651. goto hotfix_primary_boot_sector;
  652. brelse(bh_backup);
  653. } else if (!silent)
  654. ntfs_error(sb, read_err_str, "backup");
  655. /* Try to read NT3.51- backup boot sector. */
  656. if ((bh_backup = sb_bread(sb, nr_blocks >> 1))) {
  657. if (is_boot_sector_ntfs(sb, (NTFS_BOOT_SECTOR*)
  658. bh_backup->b_data, silent))
  659. goto hotfix_primary_boot_sector;
  660. if (!silent)
  661. ntfs_error(sb, "Could not find a valid backup boot "
  662. "sector.");
  663. brelse(bh_backup);
  664. } else if (!silent)
  665. ntfs_error(sb, read_err_str, "backup");
  666. /* We failed. Cleanup and return. */
  667. if (bh_primary)
  668. brelse(bh_primary);
  669. return NULL;
  670. hotfix_primary_boot_sector:
  671. if (bh_primary) {
  672. /*
  673. * If we managed to read sector zero and the volume is not
  674. * read-only, copy the found, valid backup boot sector to the
  675. * primary boot sector. Note we only copy the actual boot
  676. * sector structure, not the actual whole device sector as that
  677. * may be bigger and would potentially damage the $Boot system
  678. * file (FIXME: Would be nice to know if the backup boot sector
  679. * on a large sector device contains the whole boot loader or
  680. * just the first 512 bytes).
  681. */
  682. if (!(sb->s_flags & MS_RDONLY)) {
  683. ntfs_warning(sb, "Hot-fix: Recovering invalid primary "
  684. "boot sector from backup copy.");
  685. memcpy(bh_primary->b_data, bh_backup->b_data,
  686. NTFS_BLOCK_SIZE);
  687. mark_buffer_dirty(bh_primary);
  688. sync_dirty_buffer(bh_primary);
  689. if (buffer_uptodate(bh_primary)) {
  690. brelse(bh_backup);
  691. return bh_primary;
  692. }
  693. ntfs_error(sb, "Hot-fix: Device write error while "
  694. "recovering primary boot sector.");
  695. } else {
  696. ntfs_warning(sb, "Hot-fix: Recovery of primary boot "
  697. "sector failed: Read-only mount.");
  698. }
  699. brelse(bh_primary);
  700. }
  701. ntfs_warning(sb, "Using backup boot sector.");
  702. return bh_backup;
  703. }
  704. /**
  705. * parse_ntfs_boot_sector - parse the boot sector and store the data in @vol
  706. * @vol: volume structure to initialise with data from boot sector
  707. * @b: boot sector to parse
  708. *
  709. * Parse the ntfs boot sector @b and store all imporant information therein in
  710. * the ntfs super block @vol. Return 'true' on success and 'false' on error.
  711. */
  712. static bool parse_ntfs_boot_sector(ntfs_volume *vol, const NTFS_BOOT_SECTOR *b)
  713. {
  714. unsigned int sectors_per_cluster_bits, nr_hidden_sects;
  715. int clusters_per_mft_record, clusters_per_index_record;
  716. s64 ll;
  717. vol->sector_size = le16_to_cpu(b->bpb.bytes_per_sector);
  718. vol->sector_size_bits = ffs(vol->sector_size) - 1;
  719. ntfs_debug("vol->sector_size = %i (0x%x)", vol->sector_size,
  720. vol->sector_size);
  721. ntfs_debug("vol->sector_size_bits = %i (0x%x)", vol->sector_size_bits,
  722. vol->sector_size_bits);
  723. if (vol->sector_size < vol->sb->s_blocksize) {
  724. ntfs_error(vol->sb, "Sector size (%i) is smaller than the "
  725. "device block size (%lu). This is not "
  726. "supported. Sorry.", vol->sector_size,
  727. vol->sb->s_blocksize);
  728. return false;
  729. }
  730. ntfs_debug("sectors_per_cluster = 0x%x", b->bpb.sectors_per_cluster);
  731. sectors_per_cluster_bits = ffs(b->bpb.sectors_per_cluster) - 1;
  732. ntfs_debug("sectors_per_cluster_bits = 0x%x",
  733. sectors_per_cluster_bits);
  734. nr_hidden_sects = le32_to_cpu(b->bpb.hidden_sectors);
  735. ntfs_debug("number of hidden sectors = 0x%x", nr_hidden_sects);
  736. vol->cluster_size = vol->sector_size << sectors_per_cluster_bits;
  737. vol->cluster_size_mask = vol->cluster_size - 1;
  738. vol->cluster_size_bits = ffs(vol->cluster_size) - 1;
  739. ntfs_debug("vol->cluster_size = %i (0x%x)", vol->cluster_size,
  740. vol->cluster_size);
  741. ntfs_debug("vol->cluster_size_mask = 0x%x", vol->cluster_size_mask);
  742. ntfs_debug("vol->cluster_size_bits = %i", vol->cluster_size_bits);
  743. if (vol->cluster_size < vol->sector_size) {
  744. ntfs_error(vol->sb, "Cluster size (%i) is smaller than the "
  745. "sector size (%i). This is not supported. "
  746. "Sorry.", vol->cluster_size, vol->sector_size);
  747. return false;
  748. }
  749. clusters_per_mft_record = b->clusters_per_mft_record;
  750. ntfs_debug("clusters_per_mft_record = %i (0x%x)",
  751. clusters_per_mft_record, clusters_per_mft_record);
  752. if (clusters_per_mft_record > 0)
  753. vol->mft_record_size = vol->cluster_size <<
  754. (ffs(clusters_per_mft_record) - 1);
  755. else
  756. /*
  757. * When mft_record_size < cluster_size, clusters_per_mft_record
  758. * = -log2(mft_record_size) bytes. mft_record_size normaly is
  759. * 1024 bytes, which is encoded as 0xF6 (-10 in decimal).
  760. */
  761. vol->mft_record_size = 1 << -clusters_per_mft_record;
  762. vol->mft_record_size_mask = vol->mft_record_size - 1;
  763. vol->mft_record_size_bits = ffs(vol->mft_record_size) - 1;
  764. ntfs_debug("vol->mft_record_size = %i (0x%x)", vol->mft_record_size,
  765. vol->mft_record_size);
  766. ntfs_debug("vol->mft_record_size_mask = 0x%x",
  767. vol->mft_record_size_mask);
  768. ntfs_debug("vol->mft_record_size_bits = %i (0x%x)",
  769. vol->mft_record_size_bits, vol->mft_record_size_bits);
  770. /*
  771. * We cannot support mft record sizes above the PAGE_CACHE_SIZE since
  772. * we store $MFT/$DATA, the table of mft records in the page cache.
  773. */
  774. if (vol->mft_record_size > PAGE_CACHE_SIZE) {
  775. ntfs_error(vol->sb, "Mft record size (%i) exceeds the "
  776. "PAGE_CACHE_SIZE on your system (%lu). "
  777. "This is not supported. Sorry.",
  778. vol->mft_record_size, PAGE_CACHE_SIZE);
  779. return false;
  780. }
  781. /* We cannot support mft record sizes below the sector size. */
  782. if (vol->mft_record_size < vol->sector_size) {
  783. ntfs_error(vol->sb, "Mft record size (%i) is smaller than the "
  784. "sector size (%i). This is not supported. "
  785. "Sorry.", vol->mft_record_size,
  786. vol->sector_size);
  787. return false;
  788. }
  789. clusters_per_index_record = b->clusters_per_index_record;
  790. ntfs_debug("clusters_per_index_record = %i (0x%x)",
  791. clusters_per_index_record, clusters_per_index_record);
  792. if (clusters_per_index_record > 0)
  793. vol->index_record_size = vol->cluster_size <<
  794. (ffs(clusters_per_index_record) - 1);
  795. else
  796. /*
  797. * When index_record_size < cluster_size,
  798. * clusters_per_index_record = -log2(index_record_size) bytes.
  799. * index_record_size normaly equals 4096 bytes, which is
  800. * encoded as 0xF4 (-12 in decimal).
  801. */
  802. vol->index_record_size = 1 << -clusters_per_index_record;
  803. vol->index_record_size_mask = vol->index_record_size - 1;
  804. vol->index_record_size_bits = ffs(vol->index_record_size) - 1;
  805. ntfs_debug("vol->index_record_size = %i (0x%x)",
  806. vol->index_record_size, vol->index_record_size);
  807. ntfs_debug("vol->index_record_size_mask = 0x%x",
  808. vol->index_record_size_mask);
  809. ntfs_debug("vol->index_record_size_bits = %i (0x%x)",
  810. vol->index_record_size_bits,
  811. vol->index_record_size_bits);
  812. /* We cannot support index record sizes below the sector size. */
  813. if (vol->index_record_size < vol->sector_size) {
  814. ntfs_error(vol->sb, "Index record size (%i) is smaller than "
  815. "the sector size (%i). This is not "
  816. "supported. Sorry.", vol->index_record_size,
  817. vol->sector_size);
  818. return false;
  819. }
  820. /*
  821. * Get the size of the volume in clusters and check for 64-bit-ness.
  822. * Windows currently only uses 32 bits to save the clusters so we do
  823. * the same as it is much faster on 32-bit CPUs.
  824. */
  825. ll = sle64_to_cpu(b->number_of_sectors) >> sectors_per_cluster_bits;
  826. if ((u64)ll >= 1ULL << 32) {
  827. ntfs_error(vol->sb, "Cannot handle 64-bit clusters. Sorry.");
  828. return false;
  829. }
  830. vol->nr_clusters = ll;
  831. ntfs_debug("vol->nr_clusters = 0x%llx", (long long)vol->nr_clusters);
  832. /*
  833. * On an architecture where unsigned long is 32-bits, we restrict the
  834. * volume size to 2TiB (2^41). On a 64-bit architecture, the compiler
  835. * will hopefully optimize the whole check away.
  836. */
  837. if (sizeof(unsigned long) < 8) {
  838. if ((ll << vol->cluster_size_bits) >= (1ULL << 41)) {
  839. ntfs_error(vol->sb, "Volume size (%lluTiB) is too "
  840. "large for this architecture. "
  841. "Maximum supported is 2TiB. Sorry.",
  842. (unsigned long long)ll >> (40 -
  843. vol->cluster_size_bits));
  844. return false;
  845. }
  846. }
  847. ll = sle64_to_cpu(b->mft_lcn);
  848. if (ll >= vol->nr_clusters) {
  849. ntfs_error(vol->sb, "MFT LCN (%lli, 0x%llx) is beyond end of "
  850. "volume. Weird.", (unsigned long long)ll,
  851. (unsigned long long)ll);
  852. return false;
  853. }
  854. vol->mft_lcn = ll;
  855. ntfs_debug("vol->mft_lcn = 0x%llx", (long long)vol->mft_lcn);
  856. ll = sle64_to_cpu(b->mftmirr_lcn);
  857. if (ll >= vol->nr_clusters) {
  858. ntfs_error(vol->sb, "MFTMirr LCN (%lli, 0x%llx) is beyond end "
  859. "of volume. Weird.", (unsigned long long)ll,
  860. (unsigned long long)ll);
  861. return false;
  862. }
  863. vol->mftmirr_lcn = ll;
  864. ntfs_debug("vol->mftmirr_lcn = 0x%llx", (long long)vol->mftmirr_lcn);
  865. #ifdef NTFS_RW
  866. /*
  867. * Work out the size of the mft mirror in number of mft records. If the
  868. * cluster size is less than or equal to the size taken by four mft
  869. * records, the mft mirror stores the first four mft records. If the
  870. * cluster size is bigger than the size taken by four mft records, the
  871. * mft mirror contains as many mft records as will fit into one
  872. * cluster.
  873. */
  874. if (vol->cluster_size <= (4 << vol->mft_record_size_bits))
  875. vol->mftmirr_size = 4;
  876. else
  877. vol->mftmirr_size = vol->cluster_size >>
  878. vol->mft_record_size_bits;
  879. ntfs_debug("vol->mftmirr_size = %i", vol->mftmirr_size);
  880. #endif /* NTFS_RW */
  881. vol->serial_no = le64_to_cpu(b->volume_serial_number);
  882. ntfs_debug("vol->serial_no = 0x%llx",
  883. (unsigned long long)vol->serial_no);
  884. return true;
  885. }
  886. /**
  887. * ntfs_setup_allocators - initialize the cluster and mft allocators
  888. * @vol: volume structure for which to setup the allocators
  889. *
  890. * Setup the cluster (lcn) and mft allocators to the starting values.
  891. */
  892. static void ntfs_setup_allocators(ntfs_volume *vol)
  893. {
  894. #ifdef NTFS_RW
  895. LCN mft_zone_size, mft_lcn;
  896. #endif /* NTFS_RW */
  897. ntfs_debug("vol->mft_zone_multiplier = 0x%x",
  898. vol->mft_zone_multiplier);
  899. #ifdef NTFS_RW
  900. /* Determine the size of the MFT zone. */
  901. mft_zone_size = vol->nr_clusters;
  902. switch (vol->mft_zone_multiplier) { /* % of volume size in clusters */
  903. case 4:
  904. mft_zone_size >>= 1; /* 50% */
  905. break;
  906. case 3:
  907. mft_zone_size = (mft_zone_size +
  908. (mft_zone_size >> 1)) >> 2; /* 37.5% */
  909. break;
  910. case 2:
  911. mft_zone_size >>= 2; /* 25% */
  912. break;
  913. /* case 1: */
  914. default:
  915. mft_zone_size >>= 3; /* 12.5% */
  916. break;
  917. }
  918. /* Setup the mft zone. */
  919. vol->mft_zone_start = vol->mft_zone_pos = vol->mft_lcn;
  920. ntfs_debug("vol->mft_zone_pos = 0x%llx",
  921. (unsigned long long)vol->mft_zone_pos);
  922. /*
  923. * Calculate the mft_lcn for an unmodified NTFS volume (see mkntfs
  924. * source) and if the actual mft_lcn is in the expected place or even
  925. * further to the front of the volume, extend the mft_zone to cover the
  926. * beginning of the volume as well. This is in order to protect the
  927. * area reserved for the mft bitmap as well within the mft_zone itself.
  928. * On non-standard volumes we do not protect it as the overhead would
  929. * be higher than the speed increase we would get by doing it.
  930. */
  931. mft_lcn = (8192 + 2 * vol->cluster_size - 1) / vol->cluster_size;
  932. if (mft_lcn * vol->cluster_size < 16 * 1024)
  933. mft_lcn = (16 * 1024 + vol->cluster_size - 1) /
  934. vol->cluster_size;
  935. if (vol->mft_zone_start <= mft_lcn)
  936. vol->mft_zone_start = 0;
  937. ntfs_debug("vol->mft_zone_start = 0x%llx",
  938. (unsigned long long)vol->mft_zone_start);
  939. /*
  940. * Need to cap the mft zone on non-standard volumes so that it does
  941. * not point outside the boundaries of the volume. We do this by
  942. * halving the zone size until we are inside the volume.
  943. */
  944. vol->mft_zone_end = vol->mft_lcn + mft_zone_size;
  945. while (vol->mft_zone_end >= vol->nr_clusters) {
  946. mft_zone_size >>= 1;
  947. vol->mft_zone_end = vol->mft_lcn + mft_zone_size;
  948. }
  949. ntfs_debug("vol->mft_zone_end = 0x%llx",
  950. (unsigned long long)vol->mft_zone_end);
  951. /*
  952. * Set the current position within each data zone to the start of the
  953. * respective zone.
  954. */
  955. vol->data1_zone_pos = vol->mft_zone_end;
  956. ntfs_debug("vol->data1_zone_pos = 0x%llx",
  957. (unsigned long long)vol->data1_zone_pos);
  958. vol->data2_zone_pos = 0;
  959. ntfs_debug("vol->data2_zone_pos = 0x%llx",
  960. (unsigned long long)vol->data2_zone_pos);
  961. /* Set the mft data allocation position to mft record 24. */
  962. vol->mft_data_pos = 24;
  963. ntfs_debug("vol->mft_data_pos = 0x%llx",
  964. (unsigned long long)vol->mft_data_pos);
  965. #endif /* NTFS_RW */
  966. }
  967. #ifdef NTFS_RW
  968. /**
  969. * load_and_init_mft_mirror - load and setup the mft mirror inode for a volume
  970. * @vol: ntfs super block describing device whose mft mirror to load
  971. *
  972. * Return 'true' on success or 'false' on error.
  973. */
  974. static bool load_and_init_mft_mirror(ntfs_volume *vol)
  975. {
  976. struct inode *tmp_ino;
  977. ntfs_inode *tmp_ni;
  978. ntfs_debug("Entering.");
  979. /* Get mft mirror inode. */
  980. tmp_ino = ntfs_iget(vol->sb, FILE_MFTMirr);
  981. if (IS_ERR(tmp_ino) || is_bad_inode(tmp_ino)) {
  982. if (!IS_ERR(tmp_ino))
  983. iput(tmp_ino);
  984. /* Caller will display error message. */
  985. return false;
  986. }
  987. /*
  988. * Re-initialize some specifics about $MFTMirr's inode as
  989. * ntfs_read_inode() will have set up the default ones.
  990. */
  991. /* Set uid and gid to root. */
  992. tmp_ino->i_uid = tmp_ino->i_gid = 0;
  993. /* Regular file. No access for anyone. */
  994. tmp_ino->i_mode = S_IFREG;
  995. /* No VFS initiated operations allowed for $MFTMirr. */
  996. tmp_ino->i_op = &ntfs_empty_inode_ops;
  997. tmp_ino->i_fop = &ntfs_empty_file_ops;
  998. /* Put in our special address space operations. */
  999. tmp_ino->i_mapping->a_ops = &ntfs_mst_aops;
  1000. tmp_ni = NTFS_I(tmp_ino);
  1001. /* The $MFTMirr, like the $MFT is multi sector transfer protected. */
  1002. NInoSetMstProtected(tmp_ni);
  1003. NInoSetSparseDisabled(tmp_ni);
  1004. /*
  1005. * Set up our little cheat allowing us to reuse the async read io
  1006. * completion handler for directories.
  1007. */
  1008. tmp_ni->itype.index.block_size = vol->mft_record_size;
  1009. tmp_ni->itype.index.block_size_bits = vol->mft_record_size_bits;
  1010. vol->mftmirr_ino = tmp_ino;
  1011. ntfs_debug("Done.");
  1012. return true;
  1013. }
  1014. /**
  1015. * check_mft_mirror - compare contents of the mft mirror with the mft
  1016. * @vol: ntfs super block describing device whose mft mirror to check
  1017. *
  1018. * Return 'true' on success or 'false' on error.
  1019. *
  1020. * Note, this function also results in the mft mirror runlist being completely
  1021. * mapped into memory. The mft mirror write code requires this and will BUG()
  1022. * should it find an unmapped runlist element.
  1023. */
  1024. static bool check_mft_mirror(ntfs_volume *vol)
  1025. {
  1026. struct super_block *sb = vol->sb;
  1027. ntfs_inode *mirr_ni;
  1028. struct page *mft_page, *mirr_page;
  1029. u8 *kmft, *kmirr;
  1030. runlist_element *rl, rl2[2];
  1031. pgoff_t index;
  1032. int mrecs_per_page, i;
  1033. ntfs_debug("Entering.");
  1034. /* Compare contents of $MFT and $MFTMirr. */
  1035. mrecs_per_page = PAGE_CACHE_SIZE / vol->mft_record_size;
  1036. BUG_ON(!mrecs_per_page);
  1037. BUG_ON(!vol->mftmirr_size);
  1038. mft_page = mirr_page = NULL;
  1039. kmft = kmirr = NULL;
  1040. index = i = 0;
  1041. do {
  1042. u32 bytes;
  1043. /* Switch pages if necessary. */
  1044. if (!(i % mrecs_per_page)) {
  1045. if (index) {
  1046. ntfs_unmap_page(mft_page);
  1047. ntfs_unmap_page(mirr_page);
  1048. }
  1049. /* Get the $MFT page. */
  1050. mft_page = ntfs_map_page(vol->mft_ino->i_mapping,
  1051. index);
  1052. if (IS_ERR(mft_page)) {
  1053. ntfs_error(sb, "Failed to read $MFT.");
  1054. return false;
  1055. }
  1056. kmft = page_address(mft_page);
  1057. /* Get the $MFTMirr page. */
  1058. mirr_page = ntfs_map_page(vol->mftmirr_ino->i_mapping,
  1059. index);
  1060. if (IS_ERR(mirr_page)) {
  1061. ntfs_error(sb, "Failed to read $MFTMirr.");
  1062. goto mft_unmap_out;
  1063. }
  1064. kmirr = page_address(mirr_page);
  1065. ++index;
  1066. }
  1067. /* Do not check the record if it is not in use. */
  1068. if (((MFT_RECORD*)kmft)->flags & MFT_RECORD_IN_USE) {
  1069. /* Make sure the record is ok. */
  1070. if (ntfs_is_baad_recordp((le32*)kmft)) {
  1071. ntfs_error(sb, "Incomplete multi sector "
  1072. "transfer detected in mft "
  1073. "record %i.", i);
  1074. mm_unmap_out:
  1075. ntfs_unmap_page(mirr_page);
  1076. mft_unmap_out:
  1077. ntfs_unmap_page(mft_page);
  1078. return false;
  1079. }
  1080. }
  1081. /* Do not check the mirror record if it is not in use. */
  1082. if (((MFT_RECORD*)kmirr)->flags & MFT_RECORD_IN_USE) {
  1083. if (ntfs_is_baad_recordp((le32*)kmirr)) {
  1084. ntfs_error(sb, "Incomplete multi sector "
  1085. "transfer detected in mft "
  1086. "mirror record %i.", i);
  1087. goto mm_unmap_out;
  1088. }
  1089. }
  1090. /* Get the amount of data in the current record. */
  1091. bytes = le32_to_cpu(((MFT_RECORD*)kmft)->bytes_in_use);
  1092. if (bytes < sizeof(MFT_RECORD_OLD) ||
  1093. bytes > vol->mft_record_size ||
  1094. ntfs_is_baad_recordp((le32*)kmft)) {
  1095. bytes = le32_to_cpu(((MFT_RECORD*)kmirr)->bytes_in_use);
  1096. if (bytes < sizeof(MFT_RECORD_OLD) ||
  1097. bytes > vol->mft_record_size ||
  1098. ntfs_is_baad_recordp((le32*)kmirr))
  1099. bytes = vol->mft_record_size;
  1100. }
  1101. /* Compare the two records. */
  1102. if (memcmp(kmft, kmirr, bytes)) {
  1103. ntfs_error(sb, "$MFT and $MFTMirr (record %i) do not "
  1104. "match. Run ntfsfix or chkdsk.", i);
  1105. goto mm_unmap_out;
  1106. }
  1107. kmft += vol->mft_record_size;
  1108. kmirr += vol->mft_record_size;
  1109. } while (++i < vol->mftmirr_size);
  1110. /* Release the last pages. */
  1111. ntfs_unmap_page(mft_page);
  1112. ntfs_unmap_page(mirr_page);
  1113. /* Construct the mft mirror runlist by hand. */
  1114. rl2[0].vcn = 0;
  1115. rl2[0].lcn = vol->mftmirr_lcn;
  1116. rl2[0].length = (vol->mftmirr_size * vol->mft_record_size +
  1117. vol->cluster_size - 1) / vol->cluster_size;
  1118. rl2[1].vcn = rl2[0].length;
  1119. rl2[1].lcn = LCN_ENOENT;
  1120. rl2[1].length = 0;
  1121. /*
  1122. * Because we have just read all of the mft mirror, we know we have
  1123. * mapped the full runlist for it.
  1124. */
  1125. mirr_ni = NTFS_I(vol->mftmirr_ino);
  1126. down_read(&mirr_ni->runlist.lock);
  1127. rl = mirr_ni->runlist.rl;
  1128. /* Compare the two runlists. They must be identical. */
  1129. i = 0;
  1130. do {
  1131. if (rl2[i].vcn != rl[i].vcn || rl2[i].lcn != rl[i].lcn ||
  1132. rl2[i].length != rl[i].length) {
  1133. ntfs_error(sb, "$MFTMirr location mismatch. "
  1134. "Run chkdsk.");
  1135. up_read(&mirr_ni->runlist.lock);
  1136. return false;
  1137. }
  1138. } while (rl2[i++].length);
  1139. up_read(&mirr_ni->runlist.lock);
  1140. ntfs_debug("Done.");
  1141. return true;
  1142. }
  1143. /**
  1144. * load_and_check_logfile - load and check the logfile inode for a volume
  1145. * @vol: ntfs super block describing device whose logfile to load
  1146. *
  1147. * Return 'true' on success or 'false' on error.
  1148. */
  1149. static bool load_and_check_logfile(ntfs_volume *vol,
  1150. RESTART_PAGE_HEADER **rp)
  1151. {
  1152. struct inode *tmp_ino;
  1153. ntfs_debug("Entering.");
  1154. tmp_ino = ntfs_iget(vol->sb, FILE_LogFile);
  1155. if (IS_ERR(tmp_ino) || is_bad_inode(tmp_ino)) {
  1156. if (!IS_ERR(tmp_ino))
  1157. iput(tmp_ino);
  1158. /* Caller will display error message. */
  1159. return false;
  1160. }
  1161. if (!ntfs_check_logfile(tmp_ino, rp)) {
  1162. iput(tmp_ino);
  1163. /* ntfs_check_logfile() will have displayed error output. */
  1164. return false;
  1165. }
  1166. NInoSetSparseDisabled(NTFS_I(tmp_ino));
  1167. vol->logfile_ino = tmp_ino;
  1168. ntfs_debug("Done.");
  1169. return true;
  1170. }
  1171. #define NTFS_HIBERFIL_HEADER_SIZE 4096
  1172. /**
  1173. * check_windows_hibernation_status - check if Windows is suspended on a volume
  1174. * @vol: ntfs super block of device to check
  1175. *
  1176. * Check if Windows is hibernated on the ntfs volume @vol. This is done by
  1177. * looking for the file hiberfil.sys in the root directory of the volume. If
  1178. * the file is not present Windows is definitely not suspended.
  1179. *
  1180. * If hiberfil.sys exists and is less than 4kiB in size it means Windows is
  1181. * definitely suspended (this volume is not the system volume). Caveat: on a
  1182. * system with many volumes it is possible that the < 4kiB check is bogus but
  1183. * for now this should do fine.
  1184. *
  1185. * If hiberfil.sys exists and is larger than 4kiB in size, we need to read the
  1186. * hiberfil header (which is the first 4kiB). If this begins with "hibr",
  1187. * Windows is definitely suspended. If it is completely full of zeroes,
  1188. * Windows is definitely not hibernated. Any other case is treated as if
  1189. * Windows is suspended. This caters for the above mentioned caveat of a
  1190. * system with many volumes where no "hibr" magic would be present and there is
  1191. * no zero header.
  1192. *
  1193. * Return 0 if Windows is not hibernated on the volume, >0 if Windows is
  1194. * hibernated on the volume, and -errno on error.
  1195. */
  1196. static int check_windows_hibernation_status(ntfs_volume *vol)
  1197. {
  1198. MFT_REF mref;
  1199. struct inode *vi;
  1200. ntfs_inode *ni;
  1201. struct page *page;
  1202. u32 *kaddr, *kend;
  1203. ntfs_name *name = NULL;
  1204. int ret = 1;
  1205. static const ntfschar hiberfil[13] = { const_cpu_to_le16('h'),
  1206. const_cpu_to_le16('i'), const_cpu_to_le16('b'),
  1207. const_cpu_to_le16('e'), const_cpu_to_le16('r'),
  1208. const_cpu_to_le16('f'), const_cpu_to_le16('i'),
  1209. const_cpu_to_le16('l'), const_cpu_to_le16('.'),
  1210. const_cpu_to_le16('s'), const_cpu_to_le16('y'),
  1211. const_cpu_to_le16('s'), 0 };
  1212. ntfs_debug("Entering.");
  1213. /*
  1214. * Find the inode number for the hibernation file by looking up the
  1215. * filename hiberfil.sys in the root directory.
  1216. */
  1217. mutex_lock(&vol->root_ino->i_mutex);
  1218. mref = ntfs_lookup_inode_by_name(NTFS_I(vol->root_ino), hiberfil, 12,
  1219. &name);
  1220. mutex_unlock(&vol->root_ino->i_mutex);
  1221. if (IS_ERR_MREF(mref)) {
  1222. ret = MREF_ERR(mref);
  1223. /* If the file does not exist, Windows is not hibernated. */
  1224. if (ret == -ENOENT) {
  1225. ntfs_debug("hiberfil.sys not present. Windows is not "
  1226. "hibernated on the volume.");
  1227. return 0;
  1228. }
  1229. /* A real error occured. */
  1230. ntfs_error(vol->sb, "Failed to find inode number for "
  1231. "hiberfil.sys.");
  1232. return ret;
  1233. }
  1234. /* We do not care for the type of match that was found. */
  1235. kfree(name);
  1236. /* Get the inode. */
  1237. vi = ntfs_iget(vol->sb, MREF(mref));
  1238. if (IS_ERR(vi) || is_bad_inode(vi)) {
  1239. if (!IS_ERR(vi))
  1240. iput(vi);
  1241. ntfs_error(vol->sb, "Failed to load hiberfil.sys.");
  1242. return IS_ERR(vi) ? PTR_ERR(vi) : -EIO;
  1243. }
  1244. if (unlikely(i_size_read(vi) < NTFS_HIBERFIL_HEADER_SIZE)) {
  1245. ntfs_debug("hiberfil.sys is smaller than 4kiB (0x%llx). "
  1246. "Windows is hibernated on the volume. This "
  1247. "is not the system volume.", i_size_read(vi));
  1248. goto iput_out;
  1249. }
  1250. ni = NTFS_I(vi);
  1251. page = ntfs_map_page(vi->i_mapping, 0);
  1252. if (IS_ERR(page)) {
  1253. ntfs_error(vol->sb, "Failed to read from hiberfil.sys.");
  1254. ret = PTR_ERR(page);
  1255. goto iput_out;
  1256. }
  1257. kaddr = (u32*)page_address(page);
  1258. if (*(le32*)kaddr == const_cpu_to_le32(0x72626968)/*'hibr'*/) {
  1259. ntfs_debug("Magic \"hibr\" found in hiberfil.sys. Windows is "
  1260. "hibernated on the volume. This is the "
  1261. "system volume.");
  1262. goto unm_iput_out;
  1263. }
  1264. kend = kaddr + NTFS_HIBERFIL_HEADER_SIZE/sizeof(*kaddr);
  1265. do {
  1266. if (unlikely(*kaddr)) {
  1267. ntfs_debug("hiberfil.sys is larger than 4kiB "
  1268. "(0x%llx), does not contain the "
  1269. "\"hibr\" magic, and does not have a "
  1270. "zero header. Windows is hibernated "
  1271. "on the volume. This is not the "
  1272. "system volume.", i_size_read(vi));
  1273. goto unm_iput_out;
  1274. }
  1275. } while (++kaddr < kend);
  1276. ntfs_debug("hiberfil.sys contains a zero header. Windows is not "
  1277. "hibernated on the volume. This is the system "
  1278. "volume.");
  1279. ret = 0;
  1280. unm_iput_out:
  1281. ntfs_unmap_page(page);
  1282. iput_out:
  1283. iput(vi);
  1284. return ret;
  1285. }
  1286. /**
  1287. * load_and_init_quota - load and setup the quota file for a volume if present
  1288. * @vol: ntfs super block describing device whose quota file to load
  1289. *
  1290. * Return 'true' on success or 'false' on error. If $Quota is not present, we
  1291. * leave vol->quota_ino as NULL and return success.
  1292. */
  1293. static bool load_and_init_quota(ntfs_volume *vol)
  1294. {
  1295. MFT_REF mref;
  1296. struct inode *tmp_ino;
  1297. ntfs_name *name = NULL;
  1298. static const ntfschar Quota[7] = { const_cpu_to_le16('$'),
  1299. const_cpu_to_le16('Q'), const_cpu_to_le16('u'),
  1300. const_cpu_to_le16('o'), const_cpu_to_le16('t'),
  1301. const_cpu_to_le16('a'), 0 };
  1302. static ntfschar Q[3] = { const_cpu_to_le16('$'),
  1303. const_cpu_to_le16('Q'), 0 };
  1304. ntfs_debug("Entering.");
  1305. /*
  1306. * Find the inode number for the quota file by looking up the filename
  1307. * $Quota in the extended system files directory $Extend.
  1308. */
  1309. mutex_lock(&vol->extend_ino->i_mutex);
  1310. mref = ntfs_lookup_inode_by_name(NTFS_I(vol->extend_ino), Quota, 6,
  1311. &name);
  1312. mutex_unlock(&vol->extend_ino->i_mutex);
  1313. if (IS_ERR_MREF(mref)) {
  1314. /*
  1315. * If the file does not exist, quotas are disabled and have
  1316. * never been enabled on this volume, just return success.
  1317. */
  1318. if (MREF_ERR(mref) == -ENOENT) {
  1319. ntfs_debug("$Quota not present. Volume does not have "
  1320. "quotas enabled.");
  1321. /*
  1322. * No need to try to set quotas out of date if they are
  1323. * not enabled.
  1324. */
  1325. NVolSetQuotaOutOfDate(vol);
  1326. return true;
  1327. }
  1328. /* A real error occured. */
  1329. ntfs_error(vol->sb, "Failed to find inode number for $Quota.");
  1330. return false;
  1331. }
  1332. /* We do not care for the type of match that was found. */
  1333. kfree(name);
  1334. /* Get the inode. */
  1335. tmp_ino = ntfs_iget(vol->sb, MREF(mref));
  1336. if (IS_ERR(tmp_ino) || is_bad_inode(tmp_ino)) {
  1337. if (!IS_ERR(tmp_ino))
  1338. iput(tmp_ino);
  1339. ntfs_error(vol->sb, "Failed to load $Quota.");
  1340. return false;
  1341. }
  1342. vol->quota_ino = tmp_ino;
  1343. /* Get the $Q index allocation attribute. */
  1344. tmp_ino = ntfs_index_iget(vol->quota_ino, Q, 2);
  1345. if (IS_ERR(tmp_ino)) {
  1346. ntfs_error(vol->sb, "Failed to load $Quota/$Q index.");
  1347. return false;
  1348. }
  1349. vol->quota_q_ino = tmp_ino;
  1350. ntfs_debug("Done.");
  1351. return true;
  1352. }
  1353. /**
  1354. * load_and_init_usnjrnl - load and setup the transaction log if present
  1355. * @vol: ntfs super block describing device whose usnjrnl file to load
  1356. *
  1357. * Return 'true' on success or 'false' on error.
  1358. *
  1359. * If $UsnJrnl is not present or in the process of being disabled, we set
  1360. * NVolUsnJrnlStamped() and return success.
  1361. *
  1362. * If the $UsnJrnl $DATA/$J attribute has a size equal to the lowest valid usn,
  1363. * i.e. transaction logging has only just been enabled or the journal has been
  1364. * stamped and nothing has been logged since, we also set NVolUsnJrnlStamped()
  1365. * and return success.
  1366. */
  1367. static bool load_and_init_usnjrnl(ntfs_volume *vol)
  1368. {
  1369. MFT_REF mref;
  1370. struct inode *tmp_ino;
  1371. ntfs_inode *tmp_ni;
  1372. struct page *page;
  1373. ntfs_name *name = NULL;
  1374. USN_HEADER *uh;
  1375. static const ntfschar UsnJrnl[9] = { const_cpu_to_le16('$'),
  1376. const_cpu_to_le16('U'), const_cpu_to_le16('s'),
  1377. const_cpu_to_le16('n'), const_cpu_to_le16('J'),
  1378. const_cpu_to_le16('r'), const_cpu_to_le16('n'),
  1379. const_cpu_to_le16('l'), 0 };
  1380. static ntfschar Max[5] = { const_cpu_to_le16('$'),
  1381. const_cpu_to_le16('M'), const_cpu_to_le16('a'),
  1382. const_cpu_to_le16('x'), 0 };
  1383. static ntfschar J[3] = { const_cpu_to_le16('$'),
  1384. const_cpu_to_le16('J'), 0 };
  1385. ntfs_debug("Entering.");
  1386. /*
  1387. * Find the inode number for the transaction log file by looking up the
  1388. * filename $UsnJrnl in the extended system files directory $Extend.
  1389. */
  1390. mutex_lock(&vol->extend_ino->i_mutex);
  1391. mref = ntfs_lookup_inode_by_name(NTFS_I(vol->extend_ino), UsnJrnl, 8,
  1392. &name);
  1393. mutex_unlock(&vol->extend_ino->i_mutex);
  1394. if (IS_ERR_MREF(mref)) {
  1395. /*
  1396. * If the file does not exist, transaction logging is disabled,
  1397. * just return success.
  1398. */
  1399. if (MREF_ERR(mref) == -ENOENT) {
  1400. ntfs_debug("$UsnJrnl not present. Volume does not "
  1401. "have transaction logging enabled.");
  1402. not_enabled:
  1403. /*
  1404. * No need to try to stamp the transaction log if
  1405. * transaction logging is not enabled.
  1406. */
  1407. NVolSetUsnJrnlStamped(vol);
  1408. return true;
  1409. }
  1410. /* A real error occured. */
  1411. ntfs_error(vol->sb, "Failed to find inode number for "
  1412. "$UsnJrnl.");
  1413. return false;
  1414. }
  1415. /* We do not care for the type of match that was found. */
  1416. kfree(name);
  1417. /* Get the inode. */
  1418. tmp_ino = ntfs_iget(vol->sb, MREF(mref));
  1419. if (unlikely(IS_ERR(tmp_ino) || is_bad_inode(tmp_ino))) {
  1420. if (!IS_ERR(tmp_ino))
  1421. iput(tmp_ino);
  1422. ntfs_error(vol->sb, "Failed to load $UsnJrnl.");
  1423. return false;
  1424. }
  1425. vol->usnjrnl_ino = tmp_ino;
  1426. /*
  1427. * If the transaction log is in the process of being deleted, we can
  1428. * ignore it.
  1429. */
  1430. if (unlikely(vol->vol_flags & VOLUME_DELETE_USN_UNDERWAY)) {
  1431. ntfs_debug("$UsnJrnl in the process of being disabled. "
  1432. "Volume does not have transaction logging "
  1433. "enabled.");
  1434. goto not_enabled;
  1435. }
  1436. /* Get the $DATA/$Max attribute. */
  1437. tmp_ino = ntfs_attr_iget(vol->usnjrnl_ino, AT_DATA, Max, 4);
  1438. if (IS_ERR(tmp_ino)) {
  1439. ntfs_error(vol->sb, "Failed to load $UsnJrnl/$DATA/$Max "
  1440. "attribute.");
  1441. return false;
  1442. }
  1443. vol->usnjrnl_max_ino = tmp_ino;
  1444. if (unlikely(i_size_read(tmp_ino) < sizeof(USN_HEADER))) {
  1445. ntfs_error(vol->sb, "Found corrupt $UsnJrnl/$DATA/$Max "
  1446. "attribute (size is 0x%llx but should be at "
  1447. "least 0x%zx bytes).", i_size_read(tmp_ino),
  1448. sizeof(USN_HEADER));
  1449. return false;
  1450. }
  1451. /* Get the $DATA/$J attribute. */
  1452. tmp_ino = ntfs_attr_iget(vol->usnjrnl_ino, AT_DATA, J, 2);
  1453. if (IS_ERR(tmp_ino)) {
  1454. ntfs_error(vol->sb, "Failed to load $UsnJrnl/$DATA/$J "
  1455. "attribute.");
  1456. return false;
  1457. }
  1458. vol->usnjrnl_j_ino = tmp_ino;
  1459. /* Verify $J is non-resident and sparse. */
  1460. tmp_ni = NTFS_I(vol->usnjrnl_j_ino);
  1461. if (unlikely(!NInoNonResident(tmp_ni) || !NInoSparse(tmp_ni))) {
  1462. ntfs_error(vol->sb, "$UsnJrnl/$DATA/$J attribute is resident "
  1463. "and/or not sparse.");
  1464. return false;
  1465. }
  1466. /* Read the USN_HEADER from $DATA/$Max. */
  1467. page = ntfs_map_page(vol->usnjrnl_max_ino->i_mapping, 0);
  1468. if (IS_ERR(page)) {
  1469. ntfs_error(vol->sb, "Failed to read from $UsnJrnl/$DATA/$Max "
  1470. "attribute.");
  1471. return false;
  1472. }
  1473. uh = (USN_HEADER*)page_address(page);
  1474. /* Sanity check the $Max. */
  1475. if (unlikely(sle64_to_cpu(uh->allocation_delta) >
  1476. sle64_to_cpu(uh->maximum_size))) {
  1477. ntfs_error(vol->sb, "Allocation delta (0x%llx) exceeds "
  1478. "maximum size (0x%llx). $UsnJrnl is corrupt.",
  1479. (long long)sle64_to_cpu(uh->allocation_delta),
  1480. (long long)sle64_to_cpu(uh->maximum_size));
  1481. ntfs_unmap_page(page);
  1482. return false;
  1483. }
  1484. /*
  1485. * If the transaction log has been stamped and nothing has been written
  1486. * to it since, we do not need to stamp it.
  1487. */
  1488. if (unlikely(sle64_to_cpu(uh->lowest_valid_usn) >=
  1489. i_size_read(vol->usnjrnl_j_ino))) {
  1490. if (likely(sle64_to_cpu(uh->lowest_valid_usn) ==
  1491. i_size_read(vol->usnjrnl_j_ino))) {
  1492. ntfs_unmap_page(page);
  1493. ntfs_debug("$UsnJrnl is enabled but nothing has been "
  1494. "logged since it was last stamped. "
  1495. "Treating this as if the volume does "
  1496. "not have transaction logging "
  1497. "enabled.");
  1498. goto not_enabled;
  1499. }
  1500. ntfs_error(vol->sb, "$UsnJrnl has lowest valid usn (0x%llx) "
  1501. "which is out of bounds (0x%llx). $UsnJrnl "
  1502. "is corrupt.",
  1503. (long long)sle64_to_cpu(uh->lowest_valid_usn),
  1504. i_size_read(vol->usnjrnl_j_ino));
  1505. ntfs_unmap_page(page);
  1506. return false;
  1507. }
  1508. ntfs_unmap_page(page);
  1509. ntfs_debug("Done.");
  1510. return true;
  1511. }
  1512. /**
  1513. * load_and_init_attrdef - load the attribute definitions table for a volume
  1514. * @vol: ntfs super block describing device whose attrdef to load
  1515. *
  1516. * Return 'true' on success or 'false' on error.
  1517. */
  1518. static bool load_and_init_attrdef(ntfs_volume *vol)
  1519. {
  1520. loff_t i_size;
  1521. struct super_block *sb = vol->sb;
  1522. struct inode *ino;
  1523. struct page *page;
  1524. pgoff_t index, max_index;
  1525. unsigned int size;
  1526. ntfs_debug("Entering.");
  1527. /* Read attrdef table and setup vol->attrdef and vol->attrdef_size. */
  1528. ino = ntfs_iget(sb, FILE_AttrDef);
  1529. if (IS_ERR(ino) || is_bad_inode(ino)) {
  1530. if (!IS_ERR(ino))
  1531. iput(ino);
  1532. goto failed;
  1533. }
  1534. NInoSetSparseDisabled(NTFS_I(ino));
  1535. /* The size of FILE_AttrDef must be above 0 and fit inside 31 bits. */
  1536. i_size = i_size_read(ino);
  1537. if (i_size <= 0 || i_size > 0x7fffffff)
  1538. goto iput_failed;
  1539. vol->attrdef = (ATTR_DEF*)ntfs_malloc_nofs(i_size);
  1540. if (!vol->attrdef)
  1541. goto iput_failed;
  1542. index = 0;
  1543. max_index = i_size >> PAGE_CACHE_SHIFT;
  1544. size = PAGE_CACHE_SIZE;
  1545. while (index < max_index) {
  1546. /* Read the attrdef table and copy it into the linear buffer. */
  1547. read_partial_attrdef_page:
  1548. page = ntfs_map_page(ino->i_mapping, index);
  1549. if (IS_ERR(page))
  1550. goto free_iput_failed;
  1551. memcpy((u8*)vol->attrdef + (index++ << PAGE_CACHE_SHIFT),
  1552. page_address(page), size);
  1553. ntfs_unmap_page(page);
  1554. };
  1555. if (size == PAGE_CACHE_SIZE) {
  1556. size = i_size & ~PAGE_CACHE_MASK;
  1557. if (size)
  1558. goto read_partial_attrdef_page;
  1559. }
  1560. vol->attrdef_size = i_size;
  1561. ntfs_debug("Read %llu bytes from $AttrDef.", i_size);
  1562. iput(ino);
  1563. return true;
  1564. free_iput_failed:
  1565. ntfs_free(vol->attrdef);
  1566. vol->attrdef = NULL;
  1567. iput_failed:
  1568. iput(ino);
  1569. failed:
  1570. ntfs_error(sb, "Failed to initialize attribute definition table.");
  1571. return false;
  1572. }
  1573. #endif /* NTFS_RW */
  1574. /**
  1575. * load_and_init_upcase - load the upcase table for an ntfs volume
  1576. * @vol: ntfs super block describing device whose upcase to load
  1577. *
  1578. * Return 'true' on success or 'false' on error.
  1579. */
  1580. static bool load_and_init_upcase(ntfs_volume *vol)
  1581. {
  1582. loff_t i_size;
  1583. struct super_block *sb = vol->sb;
  1584. struct inode *ino;
  1585. struct page *page;
  1586. pgoff_t index, max_index;
  1587. unsigned int size;
  1588. int i, max;
  1589. ntfs_debug("Entering.");
  1590. /* Read upcase table and setup vol->upcase and vol->upcase_len. */
  1591. ino = ntfs_iget(sb, FILE_UpCase);
  1592. if (IS_ERR(ino) || is_bad_inode(ino)) {
  1593. if (!IS_ERR(ino))
  1594. iput(ino);
  1595. goto upcase_failed;
  1596. }
  1597. /*
  1598. * The upcase size must not be above 64k Unicode characters, must not
  1599. * be zero and must be a multiple of sizeof(ntfschar).
  1600. */
  1601. i_size = i_size_read(ino);
  1602. if (!i_size || i_size & (sizeof(ntfschar) - 1) ||
  1603. i_size > 64ULL * 1024 * sizeof(ntfschar))
  1604. goto iput_upcase_failed;
  1605. vol->upcase = (ntfschar*)ntfs_malloc_nofs(i_size);
  1606. if (!vol->upcase)
  1607. goto iput_upcase_failed;
  1608. index = 0;
  1609. max_index = i_size >> PAGE_CACHE_SHIFT;
  1610. size = PAGE_CACHE_SIZE;
  1611. while (index < max_index) {
  1612. /* Read the upcase table and copy it into the linear buffer. */
  1613. read_partial_upcase_page:
  1614. page = ntfs_map_page(ino->i_mapping, index);
  1615. if (IS_ERR(page))
  1616. goto iput_upcase_failed;
  1617. memcpy((char*)vol->upcase + (index++ << PAGE_CACHE_SHIFT),
  1618. page_address(page), size);
  1619. ntfs_unmap_page(page);
  1620. };
  1621. if (size == PAGE_CACHE_SIZE) {
  1622. size = i_size & ~PAGE_CACHE_MASK;
  1623. if (size)
  1624. goto read_partial_upcase_page;
  1625. }
  1626. vol->upcase_len = i_size >> UCHAR_T_SIZE_BITS;
  1627. ntfs_debug("Read %llu bytes from $UpCase (expected %zu bytes).",
  1628. i_size, 64 * 1024 * sizeof(ntfschar));
  1629. iput(ino);
  1630. mutex_lock(&ntfs_lock);
  1631. if (!default_upcase) {
  1632. ntfs_debug("Using volume specified $UpCase since default is "
  1633. "not present.");
  1634. mutex_unlock(&ntfs_lock);
  1635. return true;
  1636. }
  1637. max = default_upcase_len;
  1638. if (max > vol->upcase_len)
  1639. max = vol->upcase_len;
  1640. for (i = 0; i < max; i++)
  1641. if (vol->upcase[i] != default_upcase[i])
  1642. break;
  1643. if (i == max) {
  1644. ntfs_free(vol->upcase);
  1645. vol->upcase = default_upcase;
  1646. vol->upcase_len = max;
  1647. ntfs_nr_upcase_users++;
  1648. mutex_unlock(&ntfs_lock);
  1649. ntfs_debug("Volume specified $UpCase matches default. Using "
  1650. "default.");
  1651. return true;
  1652. }
  1653. mutex_unlock(&ntfs_lock);
  1654. ntfs_debug("Using volume specified $UpCase since it does not match "
  1655. "the default.");
  1656. return true;
  1657. iput_upcase_failed:
  1658. iput(ino);
  1659. ntfs_free(vol->upcase);
  1660. vol->upcase = NULL;
  1661. upcase_failed:
  1662. mutex_lock(&ntfs_lock);
  1663. if (default_upcase) {
  1664. vol->upcase = default_upcase;
  1665. vol->upcase_len = default_upcase_len;
  1666. ntfs_nr_upcase_users++;
  1667. mutex_unlock(&ntfs_lock);
  1668. ntfs_error(sb, "Failed to load $UpCase from the volume. Using "
  1669. "default.");
  1670. return true;
  1671. }
  1672. mutex_unlock(&ntfs_lock);
  1673. ntfs_error(sb, "Failed to initialize upcase table.");
  1674. return false;
  1675. }
  1676. /*
  1677. * The lcn and mft bitmap inodes are NTFS-internal inodes with
  1678. * their own special locking rules:
  1679. */
  1680. static struct lock_class_key
  1681. lcnbmp_runlist_lock_key, lcnbmp_mrec_lock_key,
  1682. mftbmp_runlist_lock_key, mftbmp_mrec_lock_key;
  1683. /**
  1684. * load_system_files - open the system files using normal functions
  1685. * @vol: ntfs super block describing device whose system files to load
  1686. *
  1687. * Open the system files with normal access functions and complete setting up
  1688. * the ntfs super block @vol.
  1689. *
  1690. * Return 'true' on success or 'false' on error.
  1691. */
  1692. static bool load_system_files(ntfs_volume *vol)
  1693. {
  1694. struct super_block *sb = vol->sb;
  1695. MFT_RECORD *m;
  1696. VOLUME_INFORMATION *vi;
  1697. ntfs_attr_search_ctx *ctx;
  1698. #ifdef NTFS_RW
  1699. RESTART_PAGE_HEADER *rp;
  1700. int err;
  1701. #endif /* NTFS_RW */
  1702. ntfs_debug("Entering.");
  1703. #ifdef NTFS_RW
  1704. /* Get mft mirror inode compare the contents of $MFT and $MFTMirr. */
  1705. if (!load_and_init_mft_mirror(vol) || !check_mft_mirror(vol)) {
  1706. static const char *es1 = "Failed to load $MFTMirr";
  1707. static const char *es2 = "$MFTMirr does not match $MFT";
  1708. static const char *es3 = ". Run ntfsfix and/or chkdsk.";
  1709. /* If a read-write mount, convert it to a read-only mount. */
  1710. if (!(sb->s_flags & MS_RDONLY)) {
  1711. if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO |
  1712. ON_ERRORS_CONTINUE))) {
  1713. ntfs_error(sb, "%s and neither on_errors="
  1714. "continue nor on_errors="
  1715. "remount-ro was specified%s",
  1716. !vol->mftmirr_ino ? es1 : es2,
  1717. es3);
  1718. goto iput_mirr_err_out;
  1719. }
  1720. sb->s_flags |= MS_RDONLY;
  1721. ntfs_error(sb, "%s. Mounting read-only%s",
  1722. !vol->mftmirr_ino ? es1 : es2, es3);
  1723. } else
  1724. ntfs_warning(sb, "%s. Will not be able to remount "
  1725. "read-write%s",
  1726. !vol->mftmirr_ino ? es1 : es2, es3);
  1727. /* This will prevent a read-write remount. */
  1728. NVolSetErrors(vol);
  1729. }
  1730. #endif /* NTFS_RW */
  1731. /* Get mft bitmap attribute inode. */
  1732. vol->mftbmp_ino = ntfs_attr_iget(vol->mft_ino, AT_BITMAP, NULL, 0);
  1733. if (IS_ERR(vol->mftbmp_ino)) {
  1734. ntfs_error(sb, "Failed to load $MFT/$BITMAP attribute.");
  1735. goto iput_mirr_err_out;
  1736. }
  1737. lockdep_set_class(&NTFS_I(vol->mftbmp_ino)->runlist.lock,
  1738. &mftbmp_runlist_lock_key);
  1739. lockdep_set_class(&NTFS_I(vol->mftbmp_ino)->mrec_lock,
  1740. &mftbmp_mrec_lock_key);
  1741. /* Read upcase table and setup @vol->upcase and @vol->upcase_len. */
  1742. if (!load_and_init_upcase(vol))
  1743. goto iput_mftbmp_err_out;
  1744. #ifdef NTFS_RW
  1745. /*
  1746. * Read attribute definitions table and setup @vol->attrdef and
  1747. * @vol->attrdef_size.
  1748. */
  1749. if (!load_and_init_attrdef(vol))
  1750. goto iput_upcase_err_out;
  1751. #endif /* NTFS_RW */
  1752. /*
  1753. * Get the cluster allocation bitmap inode and verify the size, no
  1754. * need for any locking at this stage as we are already running
  1755. * exclusively as we are mount in progress task.
  1756. */
  1757. vol->lcnbmp_ino = ntfs_iget(sb, FILE_Bitmap);
  1758. if (IS_ERR(vol->lcnbmp_ino) || is_bad_inode(vol->lcnbmp_ino)) {
  1759. if (!IS_ERR(vol->lcnbmp_ino))
  1760. iput(vol->lcnbmp_ino);
  1761. goto bitmap_failed;
  1762. }
  1763. lockdep_set_class(&NTFS_I(vol->lcnbmp_ino)->runlist.lock,
  1764. &lcnbmp_runlist_lock_key);
  1765. lockdep_set_class(&NTFS_I(vol->lcnbmp_ino)->mrec_lock,
  1766. &lcnbmp_mrec_lock_key);
  1767. NInoSetSparseDisabled(NTFS_I(vol->lcnbmp_ino));
  1768. if ((vol->nr_clusters + 7) >> 3 > i_size_read(vol->lcnbmp_ino)) {
  1769. iput(vol->lcnbmp_ino);
  1770. bitmap_failed:
  1771. ntfs_error(sb, "Failed to load $Bitmap.");
  1772. goto iput_attrdef_err_out;
  1773. }
  1774. /*
  1775. * Get the volume inode and setup our cache of the volume flags and
  1776. * version.
  1777. */
  1778. vol->vol_ino = ntfs_iget(sb, FILE_Volume);
  1779. if (IS_ERR(vol->vol_ino) || is_bad_inode(vol->vol_ino)) {
  1780. if (!IS_ERR(vol->vol_ino))
  1781. iput(vol->vol_ino);
  1782. volume_failed:
  1783. ntfs_error(sb, "Failed to load $Volume.");
  1784. goto iput_lcnbmp_err_out;
  1785. }
  1786. m = map_mft_record(NTFS_I(vol->vol_ino));
  1787. if (IS_ERR(m)) {
  1788. iput_volume_failed:
  1789. iput(vol->vol_ino);
  1790. goto volume_failed;
  1791. }
  1792. if (!(ctx = ntfs_attr_get_search_ctx(NTFS_I(vol->vol_ino), m))) {
  1793. ntfs_error(sb, "Failed to get attribute search context.");
  1794. goto get_ctx_vol_failed;
  1795. }
  1796. if (ntfs_attr_lookup(AT_VOLUME_INFORMATION, NULL, 0, 0, 0, NULL, 0,
  1797. ctx) || ctx->attr->non_resident || ctx->attr->flags) {
  1798. err_put_vol:
  1799. ntfs_attr_put_search_ctx(ctx);
  1800. get_ctx_vol_failed:
  1801. unmap_mft_record(NTFS_I(vol->vol_ino));
  1802. goto iput_volume_failed;
  1803. }
  1804. vi = (VOLUME_INFORMATION*)((char*)ctx->attr +
  1805. le16_to_cpu(ctx->attr->data.resident.value_offset));
  1806. /* Some bounds checks. */
  1807. if ((u8*)vi < (u8*)ctx->attr || (u8*)vi +
  1808. le32_to_cpu(ctx->attr->data.resident.value_length) >
  1809. (u8*)ctx->attr + le32_to_cpu(ctx->attr->length))
  1810. goto err_put_vol;
  1811. /* Copy the volume flags and version to the ntfs_volume structure. */
  1812. vol->vol_flags = vi->flags;
  1813. vol->major_ver = vi->major_ver;
  1814. vol->minor_ver = vi->minor_ver;
  1815. ntfs_attr_put_search_ctx(ctx);
  1816. unmap_mft_record(NTFS_I(vol->vol_ino));
  1817. printk(KERN_INFO "NTFS volume version %i.%i.\n", vol->major_ver,
  1818. vol->minor_ver);
  1819. if (vol->major_ver < 3 && NVolSparseEnabled(vol)) {
  1820. ntfs_warning(vol->sb, "Disabling sparse support due to NTFS "
  1821. "volume version %i.%i (need at least version "
  1822. "3.0).", vol->major_ver, vol->minor_ver);
  1823. NVolClearSparseEnabled(vol);
  1824. }
  1825. #ifdef NTFS_RW
  1826. /* Make sure that no unsupported volume flags are set. */
  1827. if (vol->vol_flags & VOLUME_MUST_MOUNT_RO_MASK) {
  1828. static const char *es1a = "Volume is dirty";
  1829. static const char *es1b = "Volume has been modified by chkdsk";
  1830. static const char *es1c = "Volume has unsupported flags set";
  1831. static const char *es2a = ". Run chkdsk and mount in Windows.";
  1832. static const char *es2b = ". Mount in Windows.";
  1833. const char *es1, *es2;
  1834. es2 = es2a;
  1835. if (vol->vol_flags & VOLUME_IS_DIRTY)
  1836. es1 = es1a;
  1837. else if (vol->vol_flags & VOLUME_MODIFIED_BY_CHKDSK) {
  1838. es1 = es1b;
  1839. es2 = es2b;
  1840. } else {
  1841. es1 = es1c;
  1842. ntfs_warning(sb, "Unsupported volume flags 0x%x "
  1843. "encountered.",
  1844. (unsigned)le16_to_cpu(vol->vol_flags));
  1845. }
  1846. /* If a read-write mount, convert it to a read-only mount. */
  1847. if (!(sb->s_flags & MS_RDONLY)) {
  1848. if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO |
  1849. ON_ERRORS_CONTINUE))) {
  1850. ntfs_error(sb, "%s and neither on_errors="
  1851. "continue nor on_errors="
  1852. "remount-ro was specified%s",
  1853. es1, es2);
  1854. goto iput_vol_err_out;
  1855. }
  1856. sb->s_flags |= MS_RDONLY;
  1857. ntfs_error(sb, "%s. Mounting read-only%s", es1, es2);
  1858. } else
  1859. ntfs_warning(sb, "%s. Will not be able to remount "
  1860. "read-write%s", es1, es2);
  1861. /*
  1862. * Do not set NVolErrors() because ntfs_remount() re-checks the
  1863. * flags which we need to do in case any flags have changed.
  1864. */
  1865. }
  1866. /*
  1867. * Get the inode for the logfile, check it and determine if the volume
  1868. * was shutdown cleanly.
  1869. */
  1870. rp = NULL;
  1871. if (!load_and_check_logfile(vol, &rp) ||
  1872. !ntfs_is_logfile_clean(vol->logfile_ino, rp)) {
  1873. static const char *es1a = "Failed to load $LogFile";
  1874. static const char *es1b = "$LogFile is not clean";
  1875. static const char *es2 = ". Mount in Windows.";
  1876. const char *es1;
  1877. es1 = !vol->logfile_ino ? es1a : es1b;
  1878. /* If a read-write mount, convert it to a read-only mount. */
  1879. if (!(sb->s_flags & MS_RDONLY)) {
  1880. if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO |
  1881. ON_ERRORS_CONTINUE))) {
  1882. ntfs_error(sb, "%s and neither on_errors="
  1883. "continue nor on_errors="
  1884. "remount-ro was specified%s",
  1885. es1, es2);
  1886. if (vol->logfile_ino) {
  1887. BUG_ON(!rp);
  1888. ntfs_free(rp);
  1889. }
  1890. goto iput_logfile_err_out;
  1891. }
  1892. sb->s_flags |= MS_RDONLY;
  1893. ntfs_error(sb, "%s. Mounting read-only%s", es1, es2);
  1894. } else
  1895. ntfs_warning(sb, "%s. Will not be able to remount "
  1896. "read-write%s", es1, es2);
  1897. /* This will prevent a read-write remount. */
  1898. NVolSetErrors(vol);
  1899. }
  1900. ntfs_free(rp);
  1901. #endif /* NTFS_RW */
  1902. /* Get the root directory inode so we can do path lookups. */
  1903. vol->root_ino = ntfs_iget(sb, FILE_root);
  1904. if (IS_ERR(vol->root_ino) || is_bad_inode(vol->root_ino)) {
  1905. if (!IS_ERR(vol->root_ino))
  1906. iput(vol->root_ino);
  1907. ntfs_error(sb, "Failed to load root directory.");
  1908. goto iput_logfile_err_out;
  1909. }
  1910. #ifdef NTFS_RW
  1911. /*
  1912. * Check if Windows is suspended to disk on the target volume. If it
  1913. * is hibernated, we must not write *anything* to the disk so set
  1914. * NVolErrors() without setting the dirty volume flag and mount
  1915. * read-only. This will prevent read-write remounting and it will also
  1916. * prevent all writes.
  1917. */
  1918. err = check_windows_hibernation_status(vol);
  1919. if (unlikely(err)) {
  1920. static const char *es1a = "Failed to determine if Windows is "
  1921. "hibernated";
  1922. static const char *es1b = "Windows is hibernated";
  1923. static const char *es2 = ". Run chkdsk.";
  1924. const char *es1;
  1925. es1 = err < 0 ? es1a : es1b;
  1926. /* If a read-write mount, convert it to a read-only mount. */
  1927. if (!(sb->s_flags & MS_RDONLY)) {
  1928. if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO |
  1929. ON_ERRORS_CONTINUE))) {
  1930. ntfs_error(sb, "%s and neither on_errors="
  1931. "continue nor on_errors="
  1932. "remount-ro was specified%s",
  1933. es1, es2);
  1934. goto iput_root_err_out;
  1935. }
  1936. sb->s_flags |= MS_RDONLY;
  1937. ntfs_error(sb, "%s. Mounting read-only%s", es1, es2);
  1938. } else
  1939. ntfs_warning(sb, "%s. Will not be able to remount "
  1940. "read-write%s", es1, es2);
  1941. /* This will prevent a read-write remount. */
  1942. NVolSetErrors(vol);
  1943. }
  1944. /* If (still) a read-write mount, mark the volume dirty. */
  1945. if (!(sb->s_flags & MS_RDONLY) &&
  1946. ntfs_set_volume_flags(vol, VOLUME_IS_DIRTY)) {
  1947. static const char *es1 = "Failed to set dirty bit in volume "
  1948. "information flags";
  1949. static const char *es2 = ". Run chkdsk.";
  1950. /* Convert to a read-only mount. */
  1951. if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO |
  1952. ON_ERRORS_CONTINUE))) {
  1953. ntfs_error(sb, "%s and neither on_errors=continue nor "
  1954. "on_errors=remount-ro was specified%s",
  1955. es1, es2);
  1956. goto iput_root_err_out;
  1957. }
  1958. ntfs_error(sb, "%s. Mounting read-only%s", es1, es2);
  1959. sb->s_flags |= MS_RDONLY;
  1960. /*
  1961. * Do not set NVolErrors() because ntfs_remount() might manage
  1962. * to set the dirty flag in which case all would be well.
  1963. */
  1964. }
  1965. #if 0
  1966. // TODO: Enable this code once we start modifying anything that is
  1967. // different between NTFS 1.2 and 3.x...
  1968. /*
  1969. * If (still) a read-write mount, set the NT4 compatibility flag on
  1970. * newer NTFS version volumes.
  1971. */
  1972. if (!(sb->s_flags & MS_RDONLY) && (vol->major_ver > 1) &&
  1973. ntfs_set_volume_flags(vol, VOLUME_MOUNTED_ON_NT4)) {
  1974. static const char *es1 = "Failed to set NT4 compatibility flag";
  1975. static const char *es2 = ". Run chkdsk.";
  1976. /* Convert to a read-only mount. */
  1977. if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO |
  1978. ON_ERRORS_CONTINUE))) {
  1979. ntfs_error(sb, "%s and neither on_errors=continue nor "
  1980. "on_errors=remount-ro was specified%s",
  1981. es1, es2);
  1982. goto iput_root_err_out;
  1983. }
  1984. ntfs_error(sb, "%s. Mounting read-only%s", es1, es2);
  1985. sb->s_flags |= MS_RDONLY;
  1986. NVolSetErrors(vol);
  1987. }
  1988. #endif
  1989. /* If (still) a read-write mount, empty the logfile. */
  1990. if (!(sb->s_flags & MS_RDONLY) &&
  1991. !ntfs_empty_logfile(vol->logfile_ino)) {
  1992. static const char *es1 = "Failed to empty $LogFile";
  1993. static const char *es2 = ". Mount in Windows.";
  1994. /* Convert to a read-only mount. */
  1995. if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO |
  1996. ON_ERRORS_CONTINUE))) {
  1997. ntfs_error(sb, "%s and neither on_errors=continue nor "
  1998. "on_errors=remount-ro was specified%s",
  1999. es1, es2);
  2000. goto iput_root_err_out;
  2001. }
  2002. ntfs_error(sb, "%s. Mounting read-only%s", es1, es2);
  2003. sb->s_flags |= MS_RDONLY;
  2004. NVolSetErrors(vol);
  2005. }
  2006. #endif /* NTFS_RW */
  2007. /* If on NTFS versions before 3.0, we are done. */
  2008. if (unlikely(vol->major_ver < 3))
  2009. return true;
  2010. /* NTFS 3.0+ specific initialization. */
  2011. /* Get the security descriptors inode. */
  2012. vol->secure_ino = ntfs_iget(sb, FILE_Secure);
  2013. if (IS_ERR(vol->secure_ino) || is_bad_inode(vol->secure_ino)) {
  2014. if (!IS_ERR(vol->secure_ino))
  2015. iput(vol->secure_ino);
  2016. ntfs_error(sb, "Failed to load $Secure.");
  2017. goto iput_root_err_out;
  2018. }
  2019. // TODO: Initialize security.
  2020. /* Get the extended system files' directory inode. */
  2021. vol->extend_ino = ntfs_iget(sb, FILE_Extend);
  2022. if (IS_ERR(vol->extend_ino) || is_bad_inode(vol->extend_ino)) {
  2023. if (!IS_ERR(vol->extend_ino))
  2024. iput(vol->extend_ino);
  2025. ntfs_error(sb, "Failed to load $Extend.");
  2026. goto iput_sec_err_out;
  2027. }
  2028. #ifdef NTFS_RW
  2029. /* Find the quota file, load it if present, and set it up. */
  2030. if (!load_and_init_quota(vol)) {
  2031. static const char *es1 = "Failed to load $Quota";
  2032. static const char *es2 = ". Run chkdsk.";
  2033. /* If a read-write mount, convert it to a read-only mount. */
  2034. if (!(sb->s_flags & MS_RDONLY)) {
  2035. if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO |
  2036. ON_ERRORS_CONTINUE))) {
  2037. ntfs_error(sb, "%s and neither on_errors="
  2038. "continue nor on_errors="
  2039. "remount-ro was specified%s",
  2040. es1, es2);
  2041. goto iput_quota_err_out;
  2042. }
  2043. sb->s_flags |= MS_RDONLY;
  2044. ntfs_error(sb, "%s. Mounting read-only%s", es1, es2);
  2045. } else
  2046. ntfs_warning(sb, "%s. Will not be able to remount "
  2047. "read-write%s", es1, es2);
  2048. /* This will prevent a read-write remount. */
  2049. NVolSetErrors(vol);
  2050. }
  2051. /* If (still) a read-write mount, mark the quotas out of date. */
  2052. if (!(sb->s_flags & MS_RDONLY) &&
  2053. !ntfs_mark_quotas_out_of_date(vol)) {
  2054. static const char *es1 = "Failed to mark quotas out of date";
  2055. static const char *es2 = ". Run chkdsk.";
  2056. /* Convert to a read-only mount. */
  2057. if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO |
  2058. ON_ERRORS_CONTINUE))) {
  2059. ntfs_error(sb, "%s and neither on_errors=continue nor "
  2060. "on_errors=remount-ro was specified%s",
  2061. es1, es2);
  2062. goto iput_quota_err_out;
  2063. }
  2064. ntfs_error(sb, "%s. Mounting read-only%s", es1, es2);
  2065. sb->s_flags |= MS_RDONLY;
  2066. NVolSetErrors(vol);
  2067. }
  2068. /*
  2069. * Find the transaction log file ($UsnJrnl), load it if present, check
  2070. * it, and set it up.
  2071. */
  2072. if (!load_and_init_usnjrnl(vol)) {
  2073. static const char *es1 = "Failed to load $UsnJrnl";
  2074. static const char *es2 = ". Run chkdsk.";
  2075. /* If a read-write mount, convert it to a read-only mount. */
  2076. if (!(sb->s_flags & MS_RDONLY)) {
  2077. if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO |
  2078. ON_ERRORS_CONTINUE))) {
  2079. ntfs_error(sb, "%s and neither on_errors="
  2080. "continue nor on_errors="
  2081. "remount-ro was specified%s",
  2082. es1, es2);
  2083. goto iput_usnjrnl_err_out;
  2084. }
  2085. sb->s_flags |= MS_RDONLY;
  2086. ntfs_error(sb, "%s. Mounting read-only%s", es1, es2);
  2087. } else
  2088. ntfs_warning(sb, "%s. Will not be able to remount "
  2089. "read-write%s", es1, es2);
  2090. /* This will prevent a read-write remount. */
  2091. NVolSetErrors(vol);
  2092. }
  2093. /* If (still) a read-write mount, stamp the transaction log. */
  2094. if (!(sb->s_flags & MS_RDONLY) && !ntfs_stamp_usnjrnl(vol)) {
  2095. static const char *es1 = "Failed to stamp transaction log "
  2096. "($UsnJrnl)";
  2097. static const char *es2 = ". Run chkdsk.";
  2098. /* Convert to a read-only mount. */
  2099. if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO |
  2100. ON_ERRORS_CONTINUE))) {
  2101. ntfs_error(sb, "%s and neither on_errors=continue nor "
  2102. "on_errors=remount-ro was specified%s",
  2103. es1, es2);
  2104. goto iput_usnjrnl_err_out;
  2105. }
  2106. ntfs_error(sb, "%s. Mounting read-only%s", es1, es2);
  2107. sb->s_flags |= MS_RDONLY;
  2108. NVolSetErrors(vol);
  2109. }
  2110. #endif /* NTFS_RW */
  2111. return true;
  2112. #ifdef NTFS_RW
  2113. iput_usnjrnl_err_out:
  2114. if (vol->usnjrnl_j_ino)
  2115. iput(vol->usnjrnl_j_ino);
  2116. if (vol->usnjrnl_max_ino)
  2117. iput(vol->usnjrnl_max_ino);
  2118. if (vol->usnjrnl_ino)
  2119. iput(vol->usnjrnl_ino);
  2120. iput_quota_err_out:
  2121. if (vol->quota_q_ino)
  2122. iput(vol->quota_q_ino);
  2123. if (vol->quota_ino)
  2124. iput(vol->quota_ino);
  2125. iput(vol->extend_ino);
  2126. #endif /* NTFS_RW */
  2127. iput_sec_err_out:
  2128. iput(vol->secure_ino);
  2129. iput_root_err_out:
  2130. iput(vol->root_ino);
  2131. iput_logfile_err_out:
  2132. #ifdef NTFS_RW
  2133. if (vol->logfile_ino)
  2134. iput(vol->logfile_ino);
  2135. iput_vol_err_out:
  2136. #endif /* NTFS_RW */
  2137. iput(vol->vol_ino);
  2138. iput_lcnbmp_err_out:
  2139. iput(vol->lcnbmp_ino);
  2140. iput_attrdef_err_out:
  2141. vol->attrdef_size = 0;
  2142. if (vol->attrdef) {
  2143. ntfs_free(vol->attrdef);
  2144. vol->attrdef = NULL;
  2145. }
  2146. #ifdef NTFS_RW
  2147. iput_upcase_err_out:
  2148. #endif /* NTFS_RW */
  2149. vol->upcase_len = 0;
  2150. mutex_lock(&ntfs_lock);
  2151. if (vol->upcase == default_upcase) {
  2152. ntfs_nr_upcase_users--;
  2153. vol->upcase = NULL;
  2154. }
  2155. mutex_unlock(&ntfs_lock);
  2156. if (vol->upcase) {
  2157. ntfs_free(vol->upcase);
  2158. vol->upcase = NULL;
  2159. }
  2160. iput_mftbmp_err_out:
  2161. iput(vol->mftbmp_ino);
  2162. iput_mirr_err_out:
  2163. #ifdef NTFS_RW
  2164. if (vol->mftmirr_ino)
  2165. iput(vol->mftmirr_ino);
  2166. #endif /* NTFS_RW */
  2167. return false;
  2168. }
  2169. /**
  2170. * ntfs_put_super - called by the vfs to unmount a volume
  2171. * @sb: vfs superblock of volume to unmount
  2172. *
  2173. * ntfs_put_super() is called by the VFS (from fs/super.c::do_umount()) when
  2174. * the volume is being unmounted (umount system call has been invoked) and it
  2175. * releases all inodes and memory belonging to the NTFS specific part of the
  2176. * super block.
  2177. */
  2178. static void ntfs_put_super(struct super_block *sb)
  2179. {
  2180. ntfs_volume *vol = NTFS_SB(sb);
  2181. ntfs_debug("Entering.");
  2182. #ifdef NTFS_RW
  2183. /*
  2184. * Commit all inodes while they are still open in case some of them
  2185. * cause others to be dirtied.
  2186. */
  2187. ntfs_commit_inode(vol->vol_ino);
  2188. /* NTFS 3.0+ specific. */
  2189. if (vol->major_ver >= 3) {
  2190. if (vol->usnjrnl_j_ino)
  2191. ntfs_commit_inode(vol->usnjrnl_j_ino);
  2192. if (vol->usnjrnl_max_ino)
  2193. ntfs_commit_inode(vol->usnjrnl_max_ino);
  2194. if (vol->usnjrnl_ino)
  2195. ntfs_commit_inode(vol->usnjrnl_ino);
  2196. if (vol->quota_q_ino)
  2197. ntfs_commit_inode(vol->quota_q_ino);
  2198. if (vol->quota_ino)
  2199. ntfs_commit_inode(vol->quota_ino);
  2200. if (vol->extend_ino)
  2201. ntfs_commit_inode(vol->extend_ino);
  2202. if (vol->secure_ino)
  2203. ntfs_commit_inode(vol->secure_ino);
  2204. }
  2205. ntfs_commit_inode(vol->root_ino);
  2206. down_write(&vol->lcnbmp_lock);
  2207. ntfs_commit_inode(vol->lcnbmp_ino);
  2208. up_write(&vol->lcnbmp_lock);
  2209. down_write(&vol->mftbmp_lock);
  2210. ntfs_commit_inode(vol->mftbmp_ino);
  2211. up_write(&vol->mftbmp_lock);
  2212. if (vol->logfile_ino)
  2213. ntfs_commit_inode(vol->logfile_ino);
  2214. if (vol->mftmirr_ino)
  2215. ntfs_commit_inode(vol->mftmirr_ino);
  2216. ntfs_commit_inode(vol->mft_ino);
  2217. /*
  2218. * If a read-write mount and no volume errors have occured, mark the
  2219. * volume clean. Also, re-commit all affected inodes.
  2220. */
  2221. if (!(sb->s_flags & MS_RDONLY)) {
  2222. if (!NVolErrors(vol)) {
  2223. if (ntfs_clear_volume_flags(vol, VOLUME_IS_DIRTY))
  2224. ntfs_warning(sb, "Failed to clear dirty bit "
  2225. "in volume information "
  2226. "flags. Run chkdsk.");
  2227. ntfs_commit_inode(vol->vol_ino);
  2228. ntfs_commit_inode(vol->root_ino);
  2229. if (vol->mftmirr_ino)
  2230. ntfs_commit_inode(vol->mftmirr_ino);
  2231. ntfs_commit_inode(vol->mft_ino);
  2232. } else {
  2233. ntfs_warning(sb, "Volume has errors. Leaving volume "
  2234. "marked dirty. Run chkdsk.");
  2235. }
  2236. }
  2237. #endif /* NTFS_RW */
  2238. iput(vol->vol_ino);
  2239. vol->vol_ino = NULL;
  2240. /* NTFS 3.0+ specific clean up. */
  2241. if (vol->major_ver >= 3) {
  2242. #ifdef NTFS_RW
  2243. if (vol->usnjrnl_j_ino) {
  2244. iput(vol->usnjrnl_j_ino);
  2245. vol->usnjrnl_j_ino = NULL;
  2246. }
  2247. if (vol->usnjrnl_max_ino) {
  2248. iput(vol->usnjrnl_max_ino);
  2249. vol->usnjrnl_max_ino = NULL;
  2250. }
  2251. if (vol->usnjrnl_ino) {
  2252. iput(vol->usnjrnl_ino);
  2253. vol->usnjrnl_ino = NULL;
  2254. }
  2255. if (vol->quota_q_ino) {
  2256. iput(vol->quota_q_ino);
  2257. vol->quota_q_ino = NULL;
  2258. }
  2259. if (vol->quota_ino) {
  2260. iput(vol->quota_ino);
  2261. vol->quota_ino = NULL;
  2262. }
  2263. #endif /* NTFS_RW */
  2264. if (vol->extend_ino) {
  2265. iput(vol->extend_ino);
  2266. vol->extend_ino = NULL;
  2267. }
  2268. if (vol->secure_ino) {
  2269. iput(vol->secure_ino);
  2270. vol->secure_ino = NULL;
  2271. }
  2272. }
  2273. iput(vol->root_ino);
  2274. vol->root_ino = NULL;
  2275. down_write(&vol->lcnbmp_lock);
  2276. iput(vol->lcnbmp_ino);
  2277. vol->lcnbmp_ino = NULL;
  2278. up_write(&vol->lcnbmp_lock);
  2279. down_write(&vol->mftbmp_lock);
  2280. iput(vol->mftbmp_ino);
  2281. vol->mftbmp_ino = NULL;
  2282. up_write(&vol->mftbmp_lock);
  2283. #ifdef NTFS_RW
  2284. if (vol->logfile_ino) {
  2285. iput(vol->logfile_ino);
  2286. vol->logfile_ino = NULL;
  2287. }
  2288. if (vol->mftmirr_ino) {
  2289. /* Re-commit the mft mirror and mft just in case. */
  2290. ntfs_commit_inode(vol->mftmirr_ino);
  2291. ntfs_commit_inode(vol->mft_ino);
  2292. iput(vol->mftmirr_ino);
  2293. vol->mftmirr_ino = NULL;
  2294. }
  2295. /*
  2296. * If any dirty inodes are left, throw away all mft data page cache
  2297. * pages to allow a clean umount. This should never happen any more
  2298. * due to mft.c::ntfs_mft_writepage() cleaning all the dirty pages as
  2299. * the underlying mft records are written out and cleaned. If it does,
  2300. * happen anyway, we want to know...
  2301. */
  2302. ntfs_commit_inode(vol->mft_ino);
  2303. write_inode_now(vol->mft_ino, 1);
  2304. if (!list_empty(&sb->s_dirty)) {
  2305. const char *s1, *s2;
  2306. mutex_lock(&vol->mft_ino->i_mutex);
  2307. truncate_inode_pages(vol->mft_ino->i_mapping, 0);
  2308. mutex_unlock(&vol->mft_ino->i_mutex);
  2309. write_inode_now(vol->mft_ino, 1);
  2310. if (!list_empty(&sb->s_dirty)) {
  2311. static const char *_s1 = "inodes";
  2312. static const char *_s2 = "";
  2313. s1 = _s1;
  2314. s2 = _s2;
  2315. } else {
  2316. static const char *_s1 = "mft pages";
  2317. static const char *_s2 = "They have been thrown "
  2318. "away. ";
  2319. s1 = _s1;
  2320. s2 = _s2;
  2321. }
  2322. ntfs_error(sb, "Dirty %s found at umount time. %sYou should "
  2323. "run chkdsk. Please email "
  2324. "linux-ntfs-dev@lists.sourceforge.net and say "
  2325. "that you saw this message. Thank you.", s1,
  2326. s2);
  2327. }
  2328. #endif /* NTFS_RW */
  2329. iput(vol->mft_ino);
  2330. vol->mft_ino = NULL;
  2331. /* Throw away the table of attribute definitions. */
  2332. vol->attrdef_size = 0;
  2333. if (vol->attrdef) {
  2334. ntfs_free(vol->attrdef);
  2335. vol->attrdef = NULL;
  2336. }
  2337. vol->upcase_len = 0;
  2338. /*
  2339. * Destroy the global default upcase table if necessary. Also decrease
  2340. * the number of upcase users if we are a user.
  2341. */
  2342. mutex_lock(&ntfs_lock);
  2343. if (vol->upcase == default_upcase) {
  2344. ntfs_nr_upcase_users--;
  2345. vol->upcase = NULL;
  2346. }
  2347. if (!ntfs_nr_upcase_users && default_upcase) {
  2348. ntfs_free(default_upcase);
  2349. default_upcase = NULL;
  2350. }
  2351. if (vol->cluster_size <= 4096 && !--ntfs_nr_compression_users)
  2352. free_compression_buffers();
  2353. mutex_unlock(&ntfs_lock);
  2354. if (vol->upcase) {
  2355. ntfs_free(vol->upcase);
  2356. vol->upcase = NULL;
  2357. }
  2358. if (vol->nls_map) {
  2359. unload_nls(vol->nls_map);
  2360. vol->nls_map = NULL;
  2361. }
  2362. sb->s_fs_info = NULL;
  2363. kfree(vol);
  2364. return;
  2365. }
  2366. /**
  2367. * get_nr_free_clusters - return the number of free clusters on a volume
  2368. * @vol: ntfs volume for which to obtain free cluster count
  2369. *
  2370. * Calculate the number of free clusters on the mounted NTFS volume @vol. We
  2371. * actually calculate the number of clusters in use instead because this
  2372. * allows us to not care about partial pages as these will be just zero filled
  2373. * and hence not be counted as allocated clusters.
  2374. *
  2375. * The only particularity is that clusters beyond the end of the logical ntfs
  2376. * volume will be marked as allocated to prevent errors which means we have to
  2377. * discount those at the end. This is important as the cluster bitmap always
  2378. * has a size in multiples of 8 bytes, i.e. up to 63 clusters could be outside
  2379. * the logical volume and marked in use when they are not as they do not exist.
  2380. *
  2381. * If any pages cannot be read we assume all clusters in the erroring pages are
  2382. * in use. This means we return an underestimate on errors which is better than
  2383. * an overestimate.
  2384. */
  2385. static s64 get_nr_free_clusters(ntfs_volume *vol)
  2386. {
  2387. s64 nr_free = vol->nr_clusters;
  2388. u32 *kaddr;
  2389. struct address_space *mapping = vol->lcnbmp_ino->i_mapping;
  2390. filler_t *readpage = (filler_t*)mapping->a_ops->readpage;
  2391. struct page *page;
  2392. pgoff_t index, max_index;
  2393. ntfs_debug("Entering.");
  2394. /* Serialize accesses to the cluster bitmap. */
  2395. down_read(&vol->lcnbmp_lock);
  2396. /*
  2397. * Convert the number of bits into bytes rounded up, then convert into
  2398. * multiples of PAGE_CACHE_SIZE, rounding up so that if we have one
  2399. * full and one partial page max_index = 2.
  2400. */
  2401. max_index = (((vol->nr_clusters + 7) >> 3) + PAGE_CACHE_SIZE - 1) >>
  2402. PAGE_CACHE_SHIFT;
  2403. /* Use multiples of 4 bytes, thus max_size is PAGE_CACHE_SIZE / 4. */
  2404. ntfs_debug("Reading $Bitmap, max_index = 0x%lx, max_size = 0x%lx.",
  2405. max_index, PAGE_CACHE_SIZE / 4);
  2406. for (index = 0; index < max_index; index++) {
  2407. unsigned int i;
  2408. /*
  2409. * Read the page from page cache, getting it from backing store
  2410. * if necessary, and increment the use count.
  2411. */
  2412. page = read_cache_page(mapping, index, (filler_t*)readpage,
  2413. NULL);
  2414. /* Ignore pages which errored synchronously. */
  2415. if (IS_ERR(page)) {
  2416. ntfs_debug("Sync read_cache_page() error. Skipping "
  2417. "page (index 0x%lx).", index);
  2418. nr_free -= PAGE_CACHE_SIZE * 8;
  2419. continue;
  2420. }
  2421. wait_on_page_locked(page);
  2422. /* Ignore pages which errored asynchronously. */
  2423. if (!PageUptodate(page)) {
  2424. ntfs_debug("Async read_cache_page() error. Skipping "
  2425. "page (index 0x%lx).", index);
  2426. page_cache_release(page);
  2427. nr_free -= PAGE_CACHE_SIZE * 8;
  2428. continue;
  2429. }
  2430. kaddr = (u32*)kmap_atomic(page, KM_USER0);
  2431. /*
  2432. * For each 4 bytes, subtract the number of set bits. If this
  2433. * is the last page and it is partial we don't really care as
  2434. * it just means we do a little extra work but it won't affect
  2435. * the result as all out of range bytes are set to zero by
  2436. * ntfs_readpage().
  2437. */
  2438. for (i = 0; i < PAGE_CACHE_SIZE / 4; i++)
  2439. nr_free -= (s64)hweight32(kaddr[i]);
  2440. kunmap_atomic(kaddr, KM_USER0);
  2441. page_cache_release(page);
  2442. }
  2443. ntfs_debug("Finished reading $Bitmap, last index = 0x%lx.", index - 1);
  2444. /*
  2445. * Fixup for eventual bits outside logical ntfs volume (see function
  2446. * description above).
  2447. */
  2448. if (vol->nr_clusters & 63)
  2449. nr_free += 64 - (vol->nr_clusters & 63);
  2450. up_read(&vol->lcnbmp_lock);
  2451. /* If errors occured we may well have gone below zero, fix this. */
  2452. if (nr_free < 0)
  2453. nr_free = 0;
  2454. ntfs_debug("Exiting.");
  2455. return nr_free;
  2456. }
  2457. /**
  2458. * __get_nr_free_mft_records - return the number of free inodes on a volume
  2459. * @vol: ntfs volume for which to obtain free inode count
  2460. * @nr_free: number of mft records in filesystem
  2461. * @max_index: maximum number of pages containing set bits
  2462. *
  2463. * Calculate the number of free mft records (inodes) on the mounted NTFS
  2464. * volume @vol. We actually calculate the number of mft records in use instead
  2465. * because this allows us to not care about partial pages as these will be just
  2466. * zero filled and hence not be counted as allocated mft record.
  2467. *
  2468. * If any pages cannot be read we assume all mft records in the erroring pages
  2469. * are in use. This means we return an underestimate on errors which is better
  2470. * than an overestimate.
  2471. *
  2472. * NOTE: Caller must hold mftbmp_lock rw_semaphore for reading or writing.
  2473. */
  2474. static unsigned long __get_nr_free_mft_records(ntfs_volume *vol,
  2475. s64 nr_free, const pgoff_t max_index)
  2476. {
  2477. u32 *kaddr;
  2478. struct address_space *mapping = vol->mftbmp_ino->i_mapping;
  2479. filler_t *readpage = (filler_t*)mapping->a_ops->readpage;
  2480. struct page *page;
  2481. pgoff_t index;
  2482. ntfs_debug("Entering.");
  2483. /* Use multiples of 4 bytes, thus max_size is PAGE_CACHE_SIZE / 4. */
  2484. ntfs_debug("Reading $MFT/$BITMAP, max_index = 0x%lx, max_size = "
  2485. "0x%lx.", max_index, PAGE_CACHE_SIZE / 4);
  2486. for (index = 0; index < max_index; index++) {
  2487. unsigned int i;
  2488. /*
  2489. * Read the page from page cache, getting it from backing store
  2490. * if necessary, and increment the use count.
  2491. */
  2492. page = read_cache_page(mapping, index, (filler_t*)readpage,
  2493. NULL);
  2494. /* Ignore pages which errored synchronously. */
  2495. if (IS_ERR(page)) {
  2496. ntfs_debug("Sync read_cache_page() error. Skipping "
  2497. "page (index 0x%lx).", index);
  2498. nr_free -= PAGE_CACHE_SIZE * 8;
  2499. continue;
  2500. }
  2501. wait_on_page_locked(page);
  2502. /* Ignore pages which errored asynchronously. */
  2503. if (!PageUptodate(page)) {
  2504. ntfs_debug("Async read_cache_page() error. Skipping "
  2505. "page (index 0x%lx).", index);
  2506. page_cache_release(page);
  2507. nr_free -= PAGE_CACHE_SIZE * 8;
  2508. continue;
  2509. }
  2510. kaddr = (u32*)kmap_atomic(page, KM_USER0);
  2511. /*
  2512. * For each 4 bytes, subtract the number of set bits. If this
  2513. * is the last page and it is partial we don't really care as
  2514. * it just means we do a little extra work but it won't affect
  2515. * the result as all out of range bytes are set to zero by
  2516. * ntfs_readpage().
  2517. */
  2518. for (i = 0; i < PAGE_CACHE_SIZE / 4; i++)
  2519. nr_free -= (s64)hweight32(kaddr[i]);
  2520. kunmap_atomic(kaddr, KM_USER0);
  2521. page_cache_release(page);
  2522. }
  2523. ntfs_debug("Finished reading $MFT/$BITMAP, last index = 0x%lx.",
  2524. index - 1);
  2525. /* If errors occured we may well have gone below zero, fix this. */
  2526. if (nr_free < 0)
  2527. nr_free = 0;
  2528. ntfs_debug("Exiting.");
  2529. return nr_free;
  2530. }
  2531. /**
  2532. * ntfs_statfs - return information about mounted NTFS volume
  2533. * @dentry: dentry from mounted volume
  2534. * @sfs: statfs structure in which to return the information
  2535. *
  2536. * Return information about the mounted NTFS volume @dentry in the statfs structure
  2537. * pointed to by @sfs (this is initialized with zeros before ntfs_statfs is
  2538. * called). We interpret the values to be correct of the moment in time at
  2539. * which we are called. Most values are variable otherwise and this isn't just
  2540. * the free values but the totals as well. For example we can increase the
  2541. * total number of file nodes if we run out and we can keep doing this until
  2542. * there is no more space on the volume left at all.
  2543. *
  2544. * Called from vfs_statfs which is used to handle the statfs, fstatfs, and
  2545. * ustat system calls.
  2546. *
  2547. * Return 0 on success or -errno on error.
  2548. */
  2549. static int ntfs_statfs(struct dentry *dentry, struct kstatfs *sfs)
  2550. {
  2551. struct super_block *sb = dentry->d_sb;
  2552. s64 size;
  2553. ntfs_volume *vol = NTFS_SB(sb);
  2554. ntfs_inode *mft_ni = NTFS_I(vol->mft_ino);
  2555. pgoff_t max_index;
  2556. unsigned long flags;
  2557. ntfs_debug("Entering.");
  2558. /* Type of filesystem. */
  2559. sfs->f_type = NTFS_SB_MAGIC;
  2560. /* Optimal transfer block size. */
  2561. sfs->f_bsize = PAGE_CACHE_SIZE;
  2562. /*
  2563. * Total data blocks in filesystem in units of f_bsize and since
  2564. * inodes are also stored in data blocs ($MFT is a file) this is just
  2565. * the total clusters.
  2566. */
  2567. sfs->f_blocks = vol->nr_clusters << vol->cluster_size_bits >>
  2568. PAGE_CACHE_SHIFT;
  2569. /* Free data blocks in filesystem in units of f_bsize. */
  2570. size = get_nr_free_clusters(vol) << vol->cluster_size_bits >>
  2571. PAGE_CACHE_SHIFT;
  2572. if (size < 0LL)
  2573. size = 0LL;
  2574. /* Free blocks avail to non-superuser, same as above on NTFS. */
  2575. sfs->f_bavail = sfs->f_bfree = size;
  2576. /* Serialize accesses to the inode bitmap. */
  2577. down_read(&vol->mftbmp_lock);
  2578. read_lock_irqsave(&mft_ni->size_lock, flags);
  2579. size = i_size_read(vol->mft_ino) >> vol->mft_record_size_bits;
  2580. /*
  2581. * Convert the maximum number of set bits into bytes rounded up, then
  2582. * convert into multiples of PAGE_CACHE_SIZE, rounding up so that if we
  2583. * have one full and one partial page max_index = 2.
  2584. */
  2585. max_index = ((((mft_ni->initialized_size >> vol->mft_record_size_bits)
  2586. + 7) >> 3) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
  2587. read_unlock_irqrestore(&mft_ni->size_lock, flags);
  2588. /* Number of inodes in filesystem (at this point in time). */
  2589. sfs->f_files = size;
  2590. /* Free inodes in fs (based on current total count). */
  2591. sfs->f_ffree = __get_nr_free_mft_records(vol, size, max_index);
  2592. up_read(&vol->mftbmp_lock);
  2593. /*
  2594. * File system id. This is extremely *nix flavour dependent and even
  2595. * within Linux itself all fs do their own thing. I interpret this to
  2596. * mean a unique id associated with the mounted fs and not the id
  2597. * associated with the filesystem driver, the latter is already given
  2598. * by the filesystem type in sfs->f_type. Thus we use the 64-bit
  2599. * volume serial number splitting it into two 32-bit parts. We enter
  2600. * the least significant 32-bits in f_fsid[0] and the most significant
  2601. * 32-bits in f_fsid[1].
  2602. */
  2603. sfs->f_fsid.val[0] = vol->serial_no & 0xffffffff;
  2604. sfs->f_fsid.val[1] = (vol->serial_no >> 32) & 0xffffffff;
  2605. /* Maximum length of filenames. */
  2606. sfs->f_namelen = NTFS_MAX_NAME_LEN;
  2607. return 0;
  2608. }
  2609. /**
  2610. * The complete super operations.
  2611. */
  2612. static const struct super_operations ntfs_sops = {
  2613. .alloc_inode = ntfs_alloc_big_inode, /* VFS: Allocate new inode. */
  2614. .destroy_inode = ntfs_destroy_big_inode, /* VFS: Deallocate inode. */
  2615. #ifdef NTFS_RW
  2616. //.dirty_inode = NULL, /* VFS: Called from
  2617. // __mark_inode_dirty(). */
  2618. .write_inode = ntfs_write_inode, /* VFS: Write dirty inode to
  2619. disk. */
  2620. //.drop_inode = NULL, /* VFS: Called just after the
  2621. // inode reference count has
  2622. // been decreased to zero.
  2623. // NOTE: The inode lock is
  2624. // held. See fs/inode.c::
  2625. // generic_drop_inode(). */
  2626. //.delete_inode = NULL, /* VFS: Delete inode from disk.
  2627. // Called when i_count becomes
  2628. // 0 and i_nlink is also 0. */
  2629. //.write_super = NULL, /* Flush dirty super block to
  2630. // disk. */
  2631. //.sync_fs = NULL, /* ? */
  2632. //.write_super_lockfs = NULL, /* ? */
  2633. //.unlockfs = NULL, /* ? */
  2634. #endif /* NTFS_RW */
  2635. .put_super = ntfs_put_super, /* Syscall: umount. */
  2636. .statfs = ntfs_statfs, /* Syscall: statfs */
  2637. .remount_fs = ntfs_remount, /* Syscall: mount -o remount. */
  2638. .clear_inode = ntfs_clear_big_inode, /* VFS: Called when an inode is
  2639. removed from memory. */
  2640. //.umount_begin = NULL, /* Forced umount. */
  2641. .show_options = ntfs_show_options, /* Show mount options in
  2642. proc. */
  2643. };
  2644. /**
  2645. * ntfs_fill_super - mount an ntfs filesystem
  2646. * @sb: super block of ntfs filesystem to mount
  2647. * @opt: string containing the mount options
  2648. * @silent: silence error output
  2649. *
  2650. * ntfs_fill_super() is called by the VFS to mount the device described by @sb
  2651. * with the mount otions in @data with the NTFS filesystem.
  2652. *
  2653. * If @silent is true, remain silent even if errors are detected. This is used
  2654. * during bootup, when the kernel tries to mount the root filesystem with all
  2655. * registered filesystems one after the other until one succeeds. This implies
  2656. * that all filesystems except the correct one will quite correctly and
  2657. * expectedly return an error, but nobody wants to see error messages when in
  2658. * fact this is what is supposed to happen.
  2659. *
  2660. * NOTE: @sb->s_flags contains the mount options flags.
  2661. */
  2662. static int ntfs_fill_super(struct super_block *sb, void *opt, const int silent)
  2663. {
  2664. ntfs_volume *vol;
  2665. struct buffer_head *bh;
  2666. struct inode *tmp_ino;
  2667. int blocksize, result;
  2668. /*
  2669. * We do a pretty difficult piece of bootstrap by reading the
  2670. * MFT (and other metadata) from disk into memory. We'll only
  2671. * release this metadata during umount, so the locking patterns
  2672. * observed during bootstrap do not count. So turn off the
  2673. * observation of locking patterns (strictly for this context
  2674. * only) while mounting NTFS. [The validator is still active
  2675. * otherwise, even for this context: it will for example record
  2676. * lock class registrations.]
  2677. */
  2678. lockdep_off();
  2679. ntfs_debug("Entering.");
  2680. #ifndef NTFS_RW
  2681. sb->s_flags |= MS_RDONLY;
  2682. #endif /* ! NTFS_RW */
  2683. /* Allocate a new ntfs_volume and place it in sb->s_fs_info. */
  2684. sb->s_fs_info = kmalloc(sizeof(ntfs_volume), GFP_NOFS);
  2685. vol = NTFS_SB(sb);
  2686. if (!vol) {
  2687. if (!silent)
  2688. ntfs_error(sb, "Allocation of NTFS volume structure "
  2689. "failed. Aborting mount...");
  2690. lockdep_on();
  2691. return -ENOMEM;
  2692. }
  2693. /* Initialize ntfs_volume structure. */
  2694. *vol = (ntfs_volume) {
  2695. .sb = sb,
  2696. /*
  2697. * Default is group and other don't have any access to files or
  2698. * directories while owner has full access. Further, files by
  2699. * default are not executable but directories are of course
  2700. * browseable.
  2701. */
  2702. .fmask = 0177,
  2703. .dmask = 0077,
  2704. };
  2705. init_rwsem(&vol->mftbmp_lock);
  2706. init_rwsem(&vol->lcnbmp_lock);
  2707. unlock_kernel();
  2708. /* By default, enable sparse support. */
  2709. NVolSetSparseEnabled(vol);
  2710. /* Important to get the mount options dealt with now. */
  2711. if (!parse_options(vol, (char*)opt))
  2712. goto err_out_now;
  2713. /* We support sector sizes up to the PAGE_CACHE_SIZE. */
  2714. if (bdev_hardsect_size(sb->s_bdev) > PAGE_CACHE_SIZE) {
  2715. if (!silent)
  2716. ntfs_error(sb, "Device has unsupported sector size "
  2717. "(%i). The maximum supported sector "
  2718. "size on this architecture is %lu "
  2719. "bytes.",
  2720. bdev_hardsect_size(sb->s_bdev),
  2721. PAGE_CACHE_SIZE);
  2722. goto err_out_now;
  2723. }
  2724. /*
  2725. * Setup the device access block size to NTFS_BLOCK_SIZE or the hard
  2726. * sector size, whichever is bigger.
  2727. */
  2728. blocksize = sb_min_blocksize(sb, NTFS_BLOCK_SIZE);
  2729. if (blocksize < NTFS_BLOCK_SIZE) {
  2730. if (!silent)
  2731. ntfs_error(sb, "Unable to set device block size.");
  2732. goto err_out_now;
  2733. }
  2734. BUG_ON(blocksize != sb->s_blocksize);
  2735. ntfs_debug("Set device block size to %i bytes (block size bits %i).",
  2736. blocksize, sb->s_blocksize_bits);
  2737. /* Determine the size of the device in units of block_size bytes. */
  2738. if (!i_size_read(sb->s_bdev->bd_inode)) {
  2739. if (!silent)
  2740. ntfs_error(sb, "Unable to determine device size.");
  2741. goto err_out_now;
  2742. }
  2743. vol->nr_blocks = i_size_read(sb->s_bdev->bd_inode) >>
  2744. sb->s_blocksize_bits;
  2745. /* Read the boot sector and return unlocked buffer head to it. */
  2746. if (!(bh = read_ntfs_boot_sector(sb, silent))) {
  2747. if (!silent)
  2748. ntfs_error(sb, "Not an NTFS volume.");
  2749. goto err_out_now;
  2750. }
  2751. /*
  2752. * Extract the data from the boot sector and setup the ntfs volume
  2753. * using it.
  2754. */
  2755. result = parse_ntfs_boot_sector(vol, (NTFS_BOOT_SECTOR*)bh->b_data);
  2756. brelse(bh);
  2757. if (!result) {
  2758. if (!silent)
  2759. ntfs_error(sb, "Unsupported NTFS filesystem.");
  2760. goto err_out_now;
  2761. }
  2762. /*
  2763. * If the boot sector indicates a sector size bigger than the current
  2764. * device block size, switch the device block size to the sector size.
  2765. * TODO: It may be possible to support this case even when the set
  2766. * below fails, we would just be breaking up the i/o for each sector
  2767. * into multiple blocks for i/o purposes but otherwise it should just
  2768. * work. However it is safer to leave disabled until someone hits this
  2769. * error message and then we can get them to try it without the setting
  2770. * so we know for sure that it works.
  2771. */
  2772. if (vol->sector_size > blocksize) {
  2773. blocksize = sb_set_blocksize(sb, vol->sector_size);
  2774. if (blocksize != vol->sector_size) {
  2775. if (!silent)
  2776. ntfs_error(sb, "Unable to set device block "
  2777. "size to sector size (%i).",
  2778. vol->sector_size);
  2779. goto err_out_now;
  2780. }
  2781. BUG_ON(blocksize != sb->s_blocksize);
  2782. vol->nr_blocks = i_size_read(sb->s_bdev->bd_inode) >>
  2783. sb->s_blocksize_bits;
  2784. ntfs_debug("Changed device block size to %i bytes (block size "
  2785. "bits %i) to match volume sector size.",
  2786. blocksize, sb->s_blocksize_bits);
  2787. }
  2788. /* Initialize the cluster and mft allocators. */
  2789. ntfs_setup_allocators(vol);
  2790. /* Setup remaining fields in the super block. */
  2791. sb->s_magic = NTFS_SB_MAGIC;
  2792. /*
  2793. * Ntfs allows 63 bits for the file size, i.e. correct would be:
  2794. * sb->s_maxbytes = ~0ULL >> 1;
  2795. * But the kernel uses a long as the page cache page index which on
  2796. * 32-bit architectures is only 32-bits. MAX_LFS_FILESIZE is kernel
  2797. * defined to the maximum the page cache page index can cope with
  2798. * without overflowing the index or to 2^63 - 1, whichever is smaller.
  2799. */
  2800. sb->s_maxbytes = MAX_LFS_FILESIZE;
  2801. /* Ntfs measures time in 100ns intervals. */
  2802. sb->s_time_gran = 100;
  2803. /*
  2804. * Now load the metadata required for the page cache and our address
  2805. * space operations to function. We do this by setting up a specialised
  2806. * read_inode method and then just calling the normal iget() to obtain
  2807. * the inode for $MFT which is sufficient to allow our normal inode
  2808. * operations and associated address space operations to function.
  2809. */
  2810. sb->s_op = &ntfs_sops;
  2811. tmp_ino = new_inode(sb);
  2812. if (!tmp_ino) {
  2813. if (!silent)
  2814. ntfs_error(sb, "Failed to load essential metadata.");
  2815. goto err_out_now;
  2816. }
  2817. tmp_ino->i_ino = FILE_MFT;
  2818. insert_inode_hash(tmp_ino);
  2819. if (ntfs_read_inode_mount(tmp_ino) < 0) {
  2820. if (!silent)
  2821. ntfs_error(sb, "Failed to load essential metadata.");
  2822. goto iput_tmp_ino_err_out_now;
  2823. }
  2824. mutex_lock(&ntfs_lock);
  2825. /*
  2826. * The current mount is a compression user if the cluster size is
  2827. * less than or equal 4kiB.
  2828. */
  2829. if (vol->cluster_size <= 4096 && !ntfs_nr_compression_users++) {
  2830. result = allocate_compression_buffers();
  2831. if (result) {
  2832. ntfs_error(NULL, "Failed to allocate buffers "
  2833. "for compression engine.");
  2834. ntfs_nr_compression_users--;
  2835. mutex_unlock(&ntfs_lock);
  2836. goto iput_tmp_ino_err_out_now;
  2837. }
  2838. }
  2839. /*
  2840. * Generate the global default upcase table if necessary. Also
  2841. * temporarily increment the number of upcase users to avoid race
  2842. * conditions with concurrent (u)mounts.
  2843. */
  2844. if (!default_upcase)
  2845. default_upcase = generate_default_upcase();
  2846. ntfs_nr_upcase_users++;
  2847. mutex_unlock(&ntfs_lock);
  2848. /*
  2849. * From now on, ignore @silent parameter. If we fail below this line,
  2850. * it will be due to a corrupt fs or a system error, so we report it.
  2851. */
  2852. /*
  2853. * Open the system files with normal access functions and complete
  2854. * setting up the ntfs super block.
  2855. */
  2856. if (!load_system_files(vol)) {
  2857. ntfs_error(sb, "Failed to load system files.");
  2858. goto unl_upcase_iput_tmp_ino_err_out_now;
  2859. }
  2860. if ((sb->s_root = d_alloc_root(vol->root_ino))) {
  2861. /* We increment i_count simulating an ntfs_iget(). */
  2862. atomic_inc(&vol->root_ino->i_count);
  2863. ntfs_debug("Exiting, status successful.");
  2864. /* Release the default upcase if it has no users. */
  2865. mutex_lock(&ntfs_lock);
  2866. if (!--ntfs_nr_upcase_users && default_upcase) {
  2867. ntfs_free(default_upcase);
  2868. default_upcase = NULL;
  2869. }
  2870. mutex_unlock(&ntfs_lock);
  2871. sb->s_export_op = &ntfs_export_ops;
  2872. lock_kernel();
  2873. lockdep_on();
  2874. return 0;
  2875. }
  2876. ntfs_error(sb, "Failed to allocate root directory.");
  2877. /* Clean up after the successful load_system_files() call from above. */
  2878. // TODO: Use ntfs_put_super() instead of repeating all this code...
  2879. // FIXME: Should mark the volume clean as the error is most likely
  2880. // -ENOMEM.
  2881. iput(vol->vol_ino);
  2882. vol->vol_ino = NULL;
  2883. /* NTFS 3.0+ specific clean up. */
  2884. if (vol->major_ver >= 3) {
  2885. #ifdef NTFS_RW
  2886. if (vol->usnjrnl_j_ino) {
  2887. iput(vol->usnjrnl_j_ino);
  2888. vol->usnjrnl_j_ino = NULL;
  2889. }
  2890. if (vol->usnjrnl_max_ino) {
  2891. iput(vol->usnjrnl_max_ino);
  2892. vol->usnjrnl_max_ino = NULL;
  2893. }
  2894. if (vol->usnjrnl_ino) {
  2895. iput(vol->usnjrnl_ino);
  2896. vol->usnjrnl_ino = NULL;
  2897. }
  2898. if (vol->quota_q_ino) {
  2899. iput(vol->quota_q_ino);
  2900. vol->quota_q_ino = NULL;
  2901. }
  2902. if (vol->quota_ino) {
  2903. iput(vol->quota_ino);
  2904. vol->quota_ino = NULL;
  2905. }
  2906. #endif /* NTFS_RW */
  2907. if (vol->extend_ino) {
  2908. iput(vol->extend_ino);
  2909. vol->extend_ino = NULL;
  2910. }
  2911. if (vol->secure_ino) {
  2912. iput(vol->secure_ino);
  2913. vol->secure_ino = NULL;
  2914. }
  2915. }
  2916. iput(vol->root_ino);
  2917. vol->root_ino = NULL;
  2918. iput(vol->lcnbmp_ino);
  2919. vol->lcnbmp_ino = NULL;
  2920. iput(vol->mftbmp_ino);
  2921. vol->mftbmp_ino = NULL;
  2922. #ifdef NTFS_RW
  2923. if (vol->logfile_ino) {
  2924. iput(vol->logfile_ino);
  2925. vol->logfile_ino = NULL;
  2926. }
  2927. if (vol->mftmirr_ino) {
  2928. iput(vol->mftmirr_ino);
  2929. vol->mftmirr_ino = NULL;
  2930. }
  2931. #endif /* NTFS_RW */
  2932. /* Throw away the table of attribute definitions. */
  2933. vol->attrdef_size = 0;
  2934. if (vol->attrdef) {
  2935. ntfs_free(vol->attrdef);
  2936. vol->attrdef = NULL;
  2937. }
  2938. vol->upcase_len = 0;
  2939. mutex_lock(&ntfs_lock);
  2940. if (vol->upcase == default_upcase) {
  2941. ntfs_nr_upcase_users--;
  2942. vol->upcase = NULL;
  2943. }
  2944. mutex_unlock(&ntfs_lock);
  2945. if (vol->upcase) {
  2946. ntfs_free(vol->upcase);
  2947. vol->upcase = NULL;
  2948. }
  2949. if (vol->nls_map) {
  2950. unload_nls(vol->nls_map);
  2951. vol->nls_map = NULL;
  2952. }
  2953. /* Error exit code path. */
  2954. unl_upcase_iput_tmp_ino_err_out_now:
  2955. /*
  2956. * Decrease the number of upcase users and destroy the global default
  2957. * upcase table if necessary.
  2958. */
  2959. mutex_lock(&ntfs_lock);
  2960. if (!--ntfs_nr_upcase_users && default_upcase) {
  2961. ntfs_free(default_upcase);
  2962. default_upcase = NULL;
  2963. }
  2964. if (vol->cluster_size <= 4096 && !--ntfs_nr_compression_users)
  2965. free_compression_buffers();
  2966. mutex_unlock(&ntfs_lock);
  2967. iput_tmp_ino_err_out_now:
  2968. iput(tmp_ino);
  2969. if (vol->mft_ino && vol->mft_ino != tmp_ino)
  2970. iput(vol->mft_ino);
  2971. vol->mft_ino = NULL;
  2972. /*
  2973. * This is needed to get ntfs_clear_extent_inode() called for each
  2974. * inode we have ever called ntfs_iget()/iput() on, otherwise we A)
  2975. * leak resources and B) a subsequent mount fails automatically due to
  2976. * ntfs_iget() never calling down into our ntfs_read_locked_inode()
  2977. * method again... FIXME: Do we need to do this twice now because of
  2978. * attribute inodes? I think not, so leave as is for now... (AIA)
  2979. */
  2980. if (invalidate_inodes(sb)) {
  2981. ntfs_error(sb, "Busy inodes left. This is most likely a NTFS "
  2982. "driver bug.");
  2983. /* Copied from fs/super.c. I just love this message. (-; */
  2984. printk("NTFS: Busy inodes after umount. Self-destruct in 5 "
  2985. "seconds. Have a nice day...\n");
  2986. }
  2987. /* Errors at this stage are irrelevant. */
  2988. err_out_now:
  2989. lock_kernel();
  2990. sb->s_fs_info = NULL;
  2991. kfree(vol);
  2992. ntfs_debug("Failed, returning -EINVAL.");
  2993. lockdep_on();
  2994. return -EINVAL;
  2995. }
  2996. /*
  2997. * This is a slab cache to optimize allocations and deallocations of Unicode
  2998. * strings of the maximum length allowed by NTFS, which is NTFS_MAX_NAME_LEN
  2999. * (255) Unicode characters + a terminating NULL Unicode character.
  3000. */
  3001. struct kmem_cache *ntfs_name_cache;
  3002. /* Slab caches for efficient allocation/deallocation of inodes. */
  3003. struct kmem_cache *ntfs_inode_cache;
  3004. struct kmem_cache *ntfs_big_inode_cache;
  3005. /* Init once constructor for the inode slab cache. */
  3006. static void ntfs_big_inode_init_once(void *foo, struct kmem_cache *cachep,
  3007. unsigned long flags)
  3008. {
  3009. ntfs_inode *ni = (ntfs_inode *)foo;
  3010. if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
  3011. SLAB_CTOR_CONSTRUCTOR)
  3012. inode_init_once(VFS_I(ni));
  3013. }
  3014. /*
  3015. * Slab caches to optimize allocations and deallocations of attribute search
  3016. * contexts and index contexts, respectively.
  3017. */
  3018. struct kmem_cache *ntfs_attr_ctx_cache;
  3019. struct kmem_cache *ntfs_index_ctx_cache;
  3020. /* Driver wide mutex. */
  3021. DEFINE_MUTEX(ntfs_lock);
  3022. static int ntfs_get_sb(struct file_system_type *fs_type,
  3023. int flags, const char *dev_name, void *data, struct vfsmount *mnt)
  3024. {
  3025. return get_sb_bdev(fs_type, flags, dev_name, data, ntfs_fill_super,
  3026. mnt);
  3027. }
  3028. static struct file_system_type ntfs_fs_type = {
  3029. .owner = THIS_MODULE,
  3030. .name = "ntfs",
  3031. .get_sb = ntfs_get_sb,
  3032. .kill_sb = kill_block_super,
  3033. .fs_flags = FS_REQUIRES_DEV,
  3034. };
  3035. /* Stable names for the slab caches. */
  3036. static const char ntfs_index_ctx_cache_name[] = "ntfs_index_ctx_cache";
  3037. static const char ntfs_attr_ctx_cache_name[] = "ntfs_attr_ctx_cache";
  3038. static const char ntfs_name_cache_name[] = "ntfs_name_cache";
  3039. static const char ntfs_inode_cache_name[] = "ntfs_inode_cache";
  3040. static const char ntfs_big_inode_cache_name[] = "ntfs_big_inode_cache";
  3041. static int __init init_ntfs_fs(void)
  3042. {
  3043. int err = 0;
  3044. /* This may be ugly but it results in pretty output so who cares. (-8 */
  3045. printk(KERN_INFO "NTFS driver " NTFS_VERSION " [Flags: R/"
  3046. #ifdef NTFS_RW
  3047. "W"
  3048. #else
  3049. "O"
  3050. #endif
  3051. #ifdef DEBUG
  3052. " DEBUG"
  3053. #endif
  3054. #ifdef MODULE
  3055. " MODULE"
  3056. #endif
  3057. "].\n");
  3058. ntfs_debug("Debug messages are enabled.");
  3059. ntfs_index_ctx_cache = kmem_cache_create(ntfs_index_ctx_cache_name,
  3060. sizeof(ntfs_index_context), 0 /* offset */,
  3061. SLAB_HWCACHE_ALIGN, NULL /* ctor */, NULL /* dtor */);
  3062. if (!ntfs_index_ctx_cache) {
  3063. printk(KERN_CRIT "NTFS: Failed to create %s!\n",
  3064. ntfs_index_ctx_cache_name);
  3065. goto ictx_err_out;
  3066. }
  3067. ntfs_attr_ctx_cache = kmem_cache_create(ntfs_attr_ctx_cache_name,
  3068. sizeof(ntfs_attr_search_ctx), 0 /* offset */,
  3069. SLAB_HWCACHE_ALIGN, NULL /* ctor */, NULL /* dtor */);
  3070. if (!ntfs_attr_ctx_cache) {
  3071. printk(KERN_CRIT "NTFS: Failed to create %s!\n",
  3072. ntfs_attr_ctx_cache_name);
  3073. goto actx_err_out;
  3074. }
  3075. ntfs_name_cache = kmem_cache_create(ntfs_name_cache_name,
  3076. (NTFS_MAX_NAME_LEN+1) * sizeof(ntfschar), 0,
  3077. SLAB_HWCACHE_ALIGN, NULL, NULL);
  3078. if (!ntfs_name_cache) {
  3079. printk(KERN_CRIT "NTFS: Failed to create %s!\n",
  3080. ntfs_name_cache_name);
  3081. goto name_err_out;
  3082. }
  3083. ntfs_inode_cache = kmem_cache_create(ntfs_inode_cache_name,
  3084. sizeof(ntfs_inode), 0,
  3085. SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, NULL, NULL);
  3086. if (!ntfs_inode_cache) {
  3087. printk(KERN_CRIT "NTFS: Failed to create %s!\n",
  3088. ntfs_inode_cache_name);
  3089. goto inode_err_out;
  3090. }
  3091. ntfs_big_inode_cache = kmem_cache_create(ntfs_big_inode_cache_name,
  3092. sizeof(big_ntfs_inode), 0,
  3093. SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
  3094. ntfs_big_inode_init_once, NULL);
  3095. if (!ntfs_big_inode_cache) {
  3096. printk(KERN_CRIT "NTFS: Failed to create %s!\n",
  3097. ntfs_big_inode_cache_name);
  3098. goto big_inode_err_out;
  3099. }
  3100. /* Register the ntfs sysctls. */
  3101. err = ntfs_sysctl(1);
  3102. if (err) {
  3103. printk(KERN_CRIT "NTFS: Failed to register NTFS sysctls!\n");
  3104. goto sysctl_err_out;
  3105. }
  3106. err = register_filesystem(&ntfs_fs_type);
  3107. if (!err) {
  3108. ntfs_debug("NTFS driver registered successfully.");
  3109. return 0; /* Success! */
  3110. }
  3111. printk(KERN_CRIT "NTFS: Failed to register NTFS filesystem driver!\n");
  3112. sysctl_err_out:
  3113. kmem_cache_destroy(ntfs_big_inode_cache);
  3114. big_inode_err_out:
  3115. kmem_cache_destroy(ntfs_inode_cache);
  3116. inode_err_out:
  3117. kmem_cache_destroy(ntfs_name_cache);
  3118. name_err_out:
  3119. kmem_cache_destroy(ntfs_attr_ctx_cache);
  3120. actx_err_out:
  3121. kmem_cache_destroy(ntfs_index_ctx_cache);
  3122. ictx_err_out:
  3123. if (!err) {
  3124. printk(KERN_CRIT "NTFS: Aborting NTFS filesystem driver "
  3125. "registration...\n");
  3126. err = -ENOMEM;
  3127. }
  3128. return err;
  3129. }
  3130. static void __exit exit_ntfs_fs(void)
  3131. {
  3132. ntfs_debug("Unregistering NTFS driver.");
  3133. unregister_filesystem(&ntfs_fs_type);
  3134. kmem_cache_destroy(ntfs_big_inode_cache);
  3135. kmem_cache_destroy(ntfs_inode_cache);
  3136. kmem_cache_destroy(ntfs_name_cache);
  3137. kmem_cache_destroy(ntfs_attr_ctx_cache);
  3138. kmem_cache_destroy(ntfs_index_ctx_cache);
  3139. /* Unregister the ntfs sysctls. */
  3140. ntfs_sysctl(0);
  3141. }
  3142. MODULE_AUTHOR("Anton Altaparmakov <aia21@cantab.net>");
  3143. MODULE_DESCRIPTION("NTFS 1.2/3.x driver - Copyright (c) 2001-2007 Anton Altaparmakov");
  3144. MODULE_VERSION(NTFS_VERSION);
  3145. MODULE_LICENSE("GPL");
  3146. #ifdef DEBUG
  3147. module_param(debug_msgs, bool, 0);
  3148. MODULE_PARM_DESC(debug_msgs, "Enable debug messages.");
  3149. #endif
  3150. module_init(init_ntfs_fs)
  3151. module_exit(exit_ntfs_fs)