1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * super.c - NTFS kernel super block handling. Part of the Linux-NTFS project. |
4 | * |
5 | * Copyright (c) 2001-2012 Anton Altaparmakov and Tuxera Inc. |
6 | * Copyright (c) 2001,2002 Richard Russon |
7 | */ |
8 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
9 | |
10 | #include <linux/stddef.h> |
11 | #include <linux/init.h> |
12 | #include <linux/slab.h> |
13 | #include <linux/string.h> |
14 | #include <linux/spinlock.h> |
15 | #include <linux/blkdev.h> /* For bdev_logical_block_size(). */ |
16 | #include <linux/backing-dev.h> |
17 | #include <linux/buffer_head.h> |
18 | #include <linux/vfs.h> |
19 | #include <linux/moduleparam.h> |
20 | #include <linux/bitmap.h> |
21 | |
22 | #include "sysctl.h" |
23 | #include "logfile.h" |
24 | #include "quota.h" |
25 | #include "usnjrnl.h" |
26 | #include "dir.h" |
27 | #include "debug.h" |
28 | #include "index.h" |
29 | #include "inode.h" |
30 | #include "aops.h" |
31 | #include "layout.h" |
32 | #include "malloc.h" |
33 | #include "ntfs.h" |
34 | |
35 | /* Number of mounted filesystems which have compression enabled. */ |
36 | static unsigned long ntfs_nr_compression_users; |
37 | |
38 | /* A global default upcase table and a corresponding reference count. */ |
39 | static ntfschar *default_upcase; |
40 | static unsigned long ntfs_nr_upcase_users; |
41 | |
42 | /* Error constants/strings used in inode.c::ntfs_show_options(). */ |
43 | typedef enum { |
44 | /* One of these must be present, default is ON_ERRORS_CONTINUE. */ |
45 | ON_ERRORS_PANIC = 0x01, |
46 | ON_ERRORS_REMOUNT_RO = 0x02, |
47 | ON_ERRORS_CONTINUE = 0x04, |
48 | /* Optional, can be combined with any of the above. */ |
49 | ON_ERRORS_RECOVER = 0x10, |
50 | } ON_ERRORS_ACTIONS; |
51 | |
52 | const option_t on_errors_arr[] = { |
53 | { ON_ERRORS_PANIC, "panic" }, |
54 | { ON_ERRORS_REMOUNT_RO, "remount-ro" , }, |
55 | { ON_ERRORS_CONTINUE, "continue" , }, |
56 | { ON_ERRORS_RECOVER, "recover" }, |
57 | { 0, NULL } |
58 | }; |
59 | |
60 | /** |
61 | * simple_getbool - convert input string to a boolean value |
62 | * @s: input string to convert |
63 | * @setval: where to store the output boolean value |
64 | * |
65 | * Copied from old ntfs driver (which copied from vfat driver). |
66 | * |
67 | * "1", "yes", "true", or an empty string are converted to %true. |
68 | * "0", "no", and "false" are converted to %false. |
69 | * |
70 | * Return: %1 if the string is converted or was empty and *setval contains it; |
71 | * %0 if the string was not valid. |
72 | */ |
73 | static int simple_getbool(char *s, bool *setval) |
74 | { |
75 | if (s) { |
76 | if (!strcmp(s, "1" ) || !strcmp(s, "yes" ) || !strcmp(s, "true" )) |
77 | *setval = true; |
78 | else if (!strcmp(s, "0" ) || !strcmp(s, "no" ) || |
79 | !strcmp(s, "false" )) |
80 | *setval = false; |
81 | else |
82 | return 0; |
83 | } else |
84 | *setval = true; |
85 | return 1; |
86 | } |
87 | |
88 | /** |
89 | * parse_options - parse the (re)mount options |
90 | * @vol: ntfs volume |
91 | * @opt: string containing the (re)mount options |
92 | * |
93 | * Parse the recognized options in @opt for the ntfs volume described by @vol. |
94 | */ |
95 | static bool parse_options(ntfs_volume *vol, char *opt) |
96 | { |
97 | char *p, *v, *ov; |
98 | static char *utf8 = "utf8" ; |
99 | int errors = 0, sloppy = 0; |
100 | kuid_t uid = INVALID_UID; |
101 | kgid_t gid = INVALID_GID; |
102 | umode_t fmask = (umode_t)-1, dmask = (umode_t)-1; |
103 | int mft_zone_multiplier = -1, on_errors = -1; |
104 | int show_sys_files = -1, case_sensitive = -1, disable_sparse = -1; |
105 | struct nls_table *nls_map = NULL, *old_nls; |
106 | |
107 | /* I am lazy... (-8 */ |
108 | #define NTFS_GETOPT_WITH_DEFAULT(option, variable, default_value) \ |
109 | if (!strcmp(p, option)) { \ |
110 | if (!v || !*v) \ |
111 | variable = default_value; \ |
112 | else { \ |
113 | variable = simple_strtoul(ov = v, &v, 0); \ |
114 | if (*v) \ |
115 | goto needs_val; \ |
116 | } \ |
117 | } |
118 | #define NTFS_GETOPT(option, variable) \ |
119 | if (!strcmp(p, option)) { \ |
120 | if (!v || !*v) \ |
121 | goto needs_arg; \ |
122 | variable = simple_strtoul(ov = v, &v, 0); \ |
123 | if (*v) \ |
124 | goto needs_val; \ |
125 | } |
126 | #define NTFS_GETOPT_UID(option, variable) \ |
127 | if (!strcmp(p, option)) { \ |
128 | uid_t uid_value; \ |
129 | if (!v || !*v) \ |
130 | goto needs_arg; \ |
131 | uid_value = simple_strtoul(ov = v, &v, 0); \ |
132 | if (*v) \ |
133 | goto needs_val; \ |
134 | variable = make_kuid(current_user_ns(), uid_value); \ |
135 | if (!uid_valid(variable)) \ |
136 | goto needs_val; \ |
137 | } |
138 | #define NTFS_GETOPT_GID(option, variable) \ |
139 | if (!strcmp(p, option)) { \ |
140 | gid_t gid_value; \ |
141 | if (!v || !*v) \ |
142 | goto needs_arg; \ |
143 | gid_value = simple_strtoul(ov = v, &v, 0); \ |
144 | if (*v) \ |
145 | goto needs_val; \ |
146 | variable = make_kgid(current_user_ns(), gid_value); \ |
147 | if (!gid_valid(variable)) \ |
148 | goto needs_val; \ |
149 | } |
150 | #define NTFS_GETOPT_OCTAL(option, variable) \ |
151 | if (!strcmp(p, option)) { \ |
152 | if (!v || !*v) \ |
153 | goto needs_arg; \ |
154 | variable = simple_strtoul(ov = v, &v, 8); \ |
155 | if (*v) \ |
156 | goto needs_val; \ |
157 | } |
158 | #define NTFS_GETOPT_BOOL(option, variable) \ |
159 | if (!strcmp(p, option)) { \ |
160 | bool val; \ |
161 | if (!simple_getbool(v, &val)) \ |
162 | goto needs_bool; \ |
163 | variable = val; \ |
164 | } |
165 | #define NTFS_GETOPT_OPTIONS_ARRAY(option, variable, opt_array) \ |
166 | if (!strcmp(p, option)) { \ |
167 | int _i; \ |
168 | if (!v || !*v) \ |
169 | goto needs_arg; \ |
170 | ov = v; \ |
171 | if (variable == -1) \ |
172 | variable = 0; \ |
173 | for (_i = 0; opt_array[_i].str && *opt_array[_i].str; _i++) \ |
174 | if (!strcmp(opt_array[_i].str, v)) { \ |
175 | variable |= opt_array[_i].val; \ |
176 | break; \ |
177 | } \ |
178 | if (!opt_array[_i].str || !*opt_array[_i].str) \ |
179 | goto needs_val; \ |
180 | } |
181 | if (!opt || !*opt) |
182 | goto no_mount_options; |
183 | ntfs_debug("Entering with mount options string: %s" , opt); |
184 | while ((p = strsep(&opt, "," ))) { |
185 | if ((v = strchr(p, '='))) |
186 | *v++ = 0; |
187 | NTFS_GETOPT_UID("uid" , uid) |
188 | else NTFS_GETOPT_GID("gid" , gid) |
189 | else NTFS_GETOPT_OCTAL("umask" , fmask = dmask) |
190 | else NTFS_GETOPT_OCTAL("fmask" , fmask) |
191 | else NTFS_GETOPT_OCTAL("dmask" , dmask) |
192 | else NTFS_GETOPT("mft_zone_multiplier" , mft_zone_multiplier) |
193 | else NTFS_GETOPT_WITH_DEFAULT("sloppy" , sloppy, true) |
194 | else NTFS_GETOPT_BOOL("show_sys_files" , show_sys_files) |
195 | else NTFS_GETOPT_BOOL("case_sensitive" , case_sensitive) |
196 | else NTFS_GETOPT_BOOL("disable_sparse" , disable_sparse) |
197 | else NTFS_GETOPT_OPTIONS_ARRAY("errors" , on_errors, |
198 | on_errors_arr) |
199 | else if (!strcmp(p, "posix" ) || !strcmp(p, "show_inodes" )) |
200 | ntfs_warning(vol->sb, "Ignoring obsolete option %s." , |
201 | p); |
202 | else if (!strcmp(p, "nls" ) || !strcmp(p, "iocharset" )) { |
203 | if (!strcmp(p, "iocharset" )) |
204 | ntfs_warning(vol->sb, "Option iocharset is " |
205 | "deprecated. Please use " |
206 | "option nls=<charsetname> in " |
207 | "the future." ); |
208 | if (!v || !*v) |
209 | goto needs_arg; |
210 | use_utf8: |
211 | old_nls = nls_map; |
212 | nls_map = load_nls(charset: v); |
213 | if (!nls_map) { |
214 | if (!old_nls) { |
215 | ntfs_error(vol->sb, "NLS character set " |
216 | "%s not found." , v); |
217 | return false; |
218 | } |
219 | ntfs_error(vol->sb, "NLS character set %s not " |
220 | "found. Using previous one %s." , |
221 | v, old_nls->charset); |
222 | nls_map = old_nls; |
223 | } else /* nls_map */ { |
224 | unload_nls(old_nls); |
225 | } |
226 | } else if (!strcmp(p, "utf8" )) { |
227 | bool val = false; |
228 | ntfs_warning(vol->sb, "Option utf8 is no longer " |
229 | "supported, using option nls=utf8. Please " |
230 | "use option nls=utf8 in the future and " |
231 | "make sure utf8 is compiled either as a " |
232 | "module or into the kernel." ); |
233 | if (!v || !*v) |
234 | val = true; |
235 | else if (!simple_getbool(s: v, setval: &val)) |
236 | goto needs_bool; |
237 | if (val) { |
238 | v = utf8; |
239 | goto use_utf8; |
240 | } |
241 | } else { |
242 | ntfs_error(vol->sb, "Unrecognized mount option %s." , p); |
243 | if (errors < INT_MAX) |
244 | errors++; |
245 | } |
246 | #undef NTFS_GETOPT_OPTIONS_ARRAY |
247 | #undef NTFS_GETOPT_BOOL |
248 | #undef NTFS_GETOPT |
249 | #undef NTFS_GETOPT_WITH_DEFAULT |
250 | } |
251 | no_mount_options: |
252 | if (errors && !sloppy) |
253 | return false; |
254 | if (sloppy) |
255 | ntfs_warning(vol->sb, "Sloppy option given. Ignoring " |
256 | "unrecognized mount option(s) and continuing." ); |
257 | /* Keep this first! */ |
258 | if (on_errors != -1) { |
259 | if (!on_errors) { |
260 | ntfs_error(vol->sb, "Invalid errors option argument " |
261 | "or bug in options parser." ); |
262 | return false; |
263 | } |
264 | } |
265 | if (nls_map) { |
266 | if (vol->nls_map && vol->nls_map != nls_map) { |
267 | ntfs_error(vol->sb, "Cannot change NLS character set " |
268 | "on remount." ); |
269 | return false; |
270 | } /* else (!vol->nls_map) */ |
271 | ntfs_debug("Using NLS character set %s." , nls_map->charset); |
272 | vol->nls_map = nls_map; |
273 | } else /* (!nls_map) */ { |
274 | if (!vol->nls_map) { |
275 | vol->nls_map = load_nls_default(); |
276 | if (!vol->nls_map) { |
277 | ntfs_error(vol->sb, "Failed to load default " |
278 | "NLS character set." ); |
279 | return false; |
280 | } |
281 | ntfs_debug("Using default NLS character set (%s)." , |
282 | vol->nls_map->charset); |
283 | } |
284 | } |
285 | if (mft_zone_multiplier != -1) { |
286 | if (vol->mft_zone_multiplier && vol->mft_zone_multiplier != |
287 | mft_zone_multiplier) { |
288 | ntfs_error(vol->sb, "Cannot change mft_zone_multiplier " |
289 | "on remount." ); |
290 | return false; |
291 | } |
292 | if (mft_zone_multiplier < 1 || mft_zone_multiplier > 4) { |
293 | ntfs_error(vol->sb, "Invalid mft_zone_multiplier. " |
294 | "Using default value, i.e. 1." ); |
295 | mft_zone_multiplier = 1; |
296 | } |
297 | vol->mft_zone_multiplier = mft_zone_multiplier; |
298 | } |
299 | if (!vol->mft_zone_multiplier) |
300 | vol->mft_zone_multiplier = 1; |
301 | if (on_errors != -1) |
302 | vol->on_errors = on_errors; |
303 | if (!vol->on_errors || vol->on_errors == ON_ERRORS_RECOVER) |
304 | vol->on_errors |= ON_ERRORS_CONTINUE; |
305 | if (uid_valid(uid)) |
306 | vol->uid = uid; |
307 | if (gid_valid(gid)) |
308 | vol->gid = gid; |
309 | if (fmask != (umode_t)-1) |
310 | vol->fmask = fmask; |
311 | if (dmask != (umode_t)-1) |
312 | vol->dmask = dmask; |
313 | if (show_sys_files != -1) { |
314 | if (show_sys_files) |
315 | NVolSetShowSystemFiles(vol); |
316 | else |
317 | NVolClearShowSystemFiles(vol); |
318 | } |
319 | if (case_sensitive != -1) { |
320 | if (case_sensitive) |
321 | NVolSetCaseSensitive(vol); |
322 | else |
323 | NVolClearCaseSensitive(vol); |
324 | } |
325 | if (disable_sparse != -1) { |
326 | if (disable_sparse) |
327 | NVolClearSparseEnabled(vol); |
328 | else { |
329 | if (!NVolSparseEnabled(vol) && |
330 | vol->major_ver && vol->major_ver < 3) |
331 | ntfs_warning(vol->sb, "Not enabling sparse " |
332 | "support due to NTFS volume " |
333 | "version %i.%i (need at least " |
334 | "version 3.0)." , vol->major_ver, |
335 | vol->minor_ver); |
336 | else |
337 | NVolSetSparseEnabled(vol); |
338 | } |
339 | } |
340 | return true; |
341 | needs_arg: |
342 | ntfs_error(vol->sb, "The %s option requires an argument." , p); |
343 | return false; |
344 | needs_bool: |
345 | ntfs_error(vol->sb, "The %s option requires a boolean argument." , p); |
346 | return false; |
347 | needs_val: |
348 | ntfs_error(vol->sb, "Invalid %s option argument: %s" , p, ov); |
349 | return false; |
350 | } |
351 | |
352 | #ifdef NTFS_RW |
353 | |
354 | /** |
355 | * ntfs_write_volume_flags - write new flags to the volume information flags |
356 | * @vol: ntfs volume on which to modify the flags |
357 | * @flags: new flags value for the volume information flags |
358 | * |
359 | * Internal function. You probably want to use ntfs_{set,clear}_volume_flags() |
360 | * instead (see below). |
361 | * |
362 | * Replace the volume information flags on the volume @vol with the value |
363 | * supplied in @flags. Note, this overwrites the volume information flags, so |
364 | * make sure to combine the flags you want to modify with the old flags and use |
365 | * the result when calling ntfs_write_volume_flags(). |
366 | * |
367 | * Return 0 on success and -errno on error. |
368 | */ |
369 | static int ntfs_write_volume_flags(ntfs_volume *vol, const VOLUME_FLAGS flags) |
370 | { |
371 | ntfs_inode *ni = NTFS_I(inode: vol->vol_ino); |
372 | MFT_RECORD *m; |
373 | VOLUME_INFORMATION *vi; |
374 | ntfs_attr_search_ctx *ctx; |
375 | int err; |
376 | |
377 | ntfs_debug("Entering, old flags = 0x%x, new flags = 0x%x." , |
378 | le16_to_cpu(vol->vol_flags), le16_to_cpu(flags)); |
379 | if (vol->vol_flags == flags) |
380 | goto done; |
381 | BUG_ON(!ni); |
382 | m = map_mft_record(ni); |
383 | if (IS_ERR(ptr: m)) { |
384 | err = PTR_ERR(ptr: m); |
385 | goto err_out; |
386 | } |
387 | ctx = ntfs_attr_get_search_ctx(ni, mrec: m); |
388 | if (!ctx) { |
389 | err = -ENOMEM; |
390 | goto put_unm_err_out; |
391 | } |
392 | err = ntfs_attr_lookup(type: AT_VOLUME_INFORMATION, NULL, name_len: 0, ic: 0, lowest_vcn: 0, NULL, val_len: 0, |
393 | ctx); |
394 | if (err) |
395 | goto put_unm_err_out; |
396 | vi = (VOLUME_INFORMATION*)((u8*)ctx->attr + |
397 | le16_to_cpu(ctx->attr->data.resident.value_offset)); |
398 | vol->vol_flags = vi->flags = flags; |
399 | flush_dcache_mft_record_page(ni: ctx->ntfs_ino); |
400 | mark_mft_record_dirty(ni: ctx->ntfs_ino); |
401 | ntfs_attr_put_search_ctx(ctx); |
402 | unmap_mft_record(ni); |
403 | done: |
404 | ntfs_debug("Done." ); |
405 | return 0; |
406 | put_unm_err_out: |
407 | if (ctx) |
408 | ntfs_attr_put_search_ctx(ctx); |
409 | unmap_mft_record(ni); |
410 | err_out: |
411 | ntfs_error(vol->sb, "Failed with error code %i." , -err); |
412 | return err; |
413 | } |
414 | |
415 | /** |
416 | * ntfs_set_volume_flags - set bits in the volume information flags |
417 | * @vol: ntfs volume on which to modify the flags |
418 | * @flags: flags to set on the volume |
419 | * |
420 | * Set the bits in @flags in the volume information flags on the volume @vol. |
421 | * |
422 | * Return 0 on success and -errno on error. |
423 | */ |
424 | static inline int ntfs_set_volume_flags(ntfs_volume *vol, VOLUME_FLAGS flags) |
425 | { |
426 | flags &= VOLUME_FLAGS_MASK; |
427 | return ntfs_write_volume_flags(vol, flags: vol->vol_flags | flags); |
428 | } |
429 | |
430 | /** |
431 | * ntfs_clear_volume_flags - clear bits in the volume information flags |
432 | * @vol: ntfs volume on which to modify the flags |
433 | * @flags: flags to clear on the volume |
434 | * |
435 | * Clear the bits in @flags in the volume information flags on the volume @vol. |
436 | * |
437 | * Return 0 on success and -errno on error. |
438 | */ |
439 | static inline int ntfs_clear_volume_flags(ntfs_volume *vol, VOLUME_FLAGS flags) |
440 | { |
441 | flags &= VOLUME_FLAGS_MASK; |
442 | flags = vol->vol_flags & cpu_to_le16(~le16_to_cpu(flags)); |
443 | return ntfs_write_volume_flags(vol, flags); |
444 | } |
445 | |
446 | #endif /* NTFS_RW */ |
447 | |
448 | /** |
449 | * ntfs_remount - change the mount options of a mounted ntfs filesystem |
450 | * @sb: superblock of mounted ntfs filesystem |
451 | * @flags: remount flags |
452 | * @opt: remount options string |
453 | * |
454 | * Change the mount options of an already mounted ntfs filesystem. |
455 | * |
456 | * NOTE: The VFS sets the @sb->s_flags remount flags to @flags after |
457 | * ntfs_remount() returns successfully (i.e. returns 0). Otherwise, |
458 | * @sb->s_flags are not changed. |
459 | */ |
460 | static int ntfs_remount(struct super_block *sb, int *flags, char *opt) |
461 | { |
462 | ntfs_volume *vol = NTFS_SB(sb); |
463 | |
464 | ntfs_debug("Entering with remount options string: %s" , opt); |
465 | |
466 | sync_filesystem(sb); |
467 | |
468 | #ifndef NTFS_RW |
469 | /* For read-only compiled driver, enforce read-only flag. */ |
470 | *flags |= SB_RDONLY; |
471 | #else /* NTFS_RW */ |
472 | /* |
473 | * For the read-write compiled driver, if we are remounting read-write, |
474 | * make sure there are no volume errors and that no unsupported volume |
475 | * flags are set. Also, empty the logfile journal as it would become |
476 | * stale as soon as something is written to the volume and mark the |
477 | * volume dirty so that chkdsk is run if the volume is not umounted |
478 | * cleanly. Finally, mark the quotas out of date so Windows rescans |
479 | * the volume on boot and updates them. |
480 | * |
481 | * When remounting read-only, mark the volume clean if no volume errors |
482 | * have occurred. |
483 | */ |
484 | if (sb_rdonly(sb) && !(*flags & SB_RDONLY)) { |
485 | static const char *es = ". Cannot remount read-write." ; |
486 | |
487 | /* Remounting read-write. */ |
488 | if (NVolErrors(vol)) { |
489 | ntfs_error(sb, "Volume has errors and is read-only%s" , |
490 | es); |
491 | return -EROFS; |
492 | } |
493 | if (vol->vol_flags & VOLUME_IS_DIRTY) { |
494 | ntfs_error(sb, "Volume is dirty and read-only%s" , es); |
495 | return -EROFS; |
496 | } |
497 | if (vol->vol_flags & VOLUME_MODIFIED_BY_CHKDSK) { |
498 | ntfs_error(sb, "Volume has been modified by chkdsk " |
499 | "and is read-only%s" , es); |
500 | return -EROFS; |
501 | } |
502 | if (vol->vol_flags & VOLUME_MUST_MOUNT_RO_MASK) { |
503 | ntfs_error(sb, "Volume has unsupported flags set " |
504 | "(0x%x) and is read-only%s" , |
505 | (unsigned)le16_to_cpu(vol->vol_flags), |
506 | es); |
507 | return -EROFS; |
508 | } |
509 | if (ntfs_set_volume_flags(vol, flags: VOLUME_IS_DIRTY)) { |
510 | ntfs_error(sb, "Failed to set dirty bit in volume " |
511 | "information flags%s" , es); |
512 | return -EROFS; |
513 | } |
514 | #if 0 |
515 | // TODO: Enable this code once we start modifying anything that |
516 | // is different between NTFS 1.2 and 3.x... |
517 | /* Set NT4 compatibility flag on newer NTFS version volumes. */ |
518 | if ((vol->major_ver > 1)) { |
519 | if (ntfs_set_volume_flags(vol, VOLUME_MOUNTED_ON_NT4)) { |
520 | ntfs_error(sb, "Failed to set NT4 " |
521 | "compatibility flag%s" , es); |
522 | NVolSetErrors(vol); |
523 | return -EROFS; |
524 | } |
525 | } |
526 | #endif |
527 | if (!ntfs_empty_logfile(log_vi: vol->logfile_ino)) { |
528 | ntfs_error(sb, "Failed to empty journal $LogFile%s" , |
529 | es); |
530 | NVolSetErrors(vol); |
531 | return -EROFS; |
532 | } |
533 | if (!ntfs_mark_quotas_out_of_date(vol)) { |
534 | ntfs_error(sb, "Failed to mark quotas out of date%s" , |
535 | es); |
536 | NVolSetErrors(vol); |
537 | return -EROFS; |
538 | } |
539 | if (!ntfs_stamp_usnjrnl(vol)) { |
540 | ntfs_error(sb, "Failed to stamp transaction log " |
541 | "($UsnJrnl)%s" , es); |
542 | NVolSetErrors(vol); |
543 | return -EROFS; |
544 | } |
545 | } else if (!sb_rdonly(sb) && (*flags & SB_RDONLY)) { |
546 | /* Remounting read-only. */ |
547 | if (!NVolErrors(vol)) { |
548 | if (ntfs_clear_volume_flags(vol, flags: VOLUME_IS_DIRTY)) |
549 | ntfs_warning(sb, "Failed to clear dirty bit " |
550 | "in volume information " |
551 | "flags. Run chkdsk." ); |
552 | } |
553 | } |
554 | #endif /* NTFS_RW */ |
555 | |
556 | // TODO: Deal with *flags. |
557 | |
558 | if (!parse_options(vol, opt)) |
559 | return -EINVAL; |
560 | |
561 | ntfs_debug("Done." ); |
562 | return 0; |
563 | } |
564 | |
565 | /** |
566 | * is_boot_sector_ntfs - check whether a boot sector is a valid NTFS boot sector |
567 | * @sb: Super block of the device to which @b belongs. |
568 | * @b: Boot sector of device @sb to check. |
569 | * @silent: If 'true', all output will be silenced. |
570 | * |
571 | * is_boot_sector_ntfs() checks whether the boot sector @b is a valid NTFS boot |
572 | * sector. Returns 'true' if it is valid and 'false' if not. |
573 | * |
574 | * @sb is only needed for warning/error output, i.e. it can be NULL when silent |
575 | * is 'true'. |
576 | */ |
577 | static bool is_boot_sector_ntfs(const struct super_block *sb, |
578 | const NTFS_BOOT_SECTOR *b, const bool silent) |
579 | { |
580 | /* |
581 | * Check that checksum == sum of u32 values from b to the checksum |
582 | * field. If checksum is zero, no checking is done. We will work when |
583 | * the checksum test fails, since some utilities update the boot sector |
584 | * ignoring the checksum which leaves the checksum out-of-date. We |
585 | * report a warning if this is the case. |
586 | */ |
587 | if ((void*)b < (void*)&b->checksum && b->checksum && !silent) { |
588 | le32 *u; |
589 | u32 i; |
590 | |
591 | for (i = 0, u = (le32*)b; u < (le32*)(&b->checksum); ++u) |
592 | i += le32_to_cpup(p: u); |
593 | if (le32_to_cpu(b->checksum) != i) |
594 | ntfs_warning(sb, "Invalid boot sector checksum." ); |
595 | } |
596 | /* Check OEMidentifier is "NTFS " */ |
597 | if (b->oem_id != magicNTFS) |
598 | goto not_ntfs; |
599 | /* Check bytes per sector value is between 256 and 4096. */ |
600 | if (le16_to_cpu(b->bpb.bytes_per_sector) < 0x100 || |
601 | le16_to_cpu(b->bpb.bytes_per_sector) > 0x1000) |
602 | goto not_ntfs; |
603 | /* Check sectors per cluster value is valid. */ |
604 | switch (b->bpb.sectors_per_cluster) { |
605 | case 1: case 2: case 4: case 8: case 16: case 32: case 64: case 128: |
606 | break; |
607 | default: |
608 | goto not_ntfs; |
609 | } |
610 | /* Check the cluster size is not above the maximum (64kiB). */ |
611 | if ((u32)le16_to_cpu(b->bpb.bytes_per_sector) * |
612 | b->bpb.sectors_per_cluster > NTFS_MAX_CLUSTER_SIZE) |
613 | goto not_ntfs; |
614 | /* Check reserved/unused fields are really zero. */ |
615 | if (le16_to_cpu(b->bpb.reserved_sectors) || |
616 | le16_to_cpu(b->bpb.root_entries) || |
617 | le16_to_cpu(b->bpb.sectors) || |
618 | le16_to_cpu(b->bpb.sectors_per_fat) || |
619 | le32_to_cpu(b->bpb.large_sectors) || b->bpb.fats) |
620 | goto not_ntfs; |
621 | /* Check clusters per file mft record value is valid. */ |
622 | if ((u8)b->clusters_per_mft_record < 0xe1 || |
623 | (u8)b->clusters_per_mft_record > 0xf7) |
624 | switch (b->clusters_per_mft_record) { |
625 | case 1: case 2: case 4: case 8: case 16: case 32: case 64: |
626 | break; |
627 | default: |
628 | goto not_ntfs; |
629 | } |
630 | /* Check clusters per index block value is valid. */ |
631 | if ((u8)b->clusters_per_index_record < 0xe1 || |
632 | (u8)b->clusters_per_index_record > 0xf7) |
633 | switch (b->clusters_per_index_record) { |
634 | case 1: case 2: case 4: case 8: case 16: case 32: case 64: |
635 | break; |
636 | default: |
637 | goto not_ntfs; |
638 | } |
639 | /* |
640 | * Check for valid end of sector marker. We will work without it, but |
641 | * many BIOSes will refuse to boot from a bootsector if the magic is |
642 | * incorrect, so we emit a warning. |
643 | */ |
644 | if (!silent && b->end_of_sector_marker != cpu_to_le16(0xaa55)) |
645 | ntfs_warning(sb, "Invalid end of sector marker." ); |
646 | return true; |
647 | not_ntfs: |
648 | return false; |
649 | } |
650 | |
651 | /** |
652 | * read_ntfs_boot_sector - read the NTFS boot sector of a device |
653 | * @sb: super block of device to read the boot sector from |
654 | * @silent: if true, suppress all output |
655 | * |
656 | * Reads the boot sector from the device and validates it. If that fails, tries |
657 | * to read the backup boot sector, first from the end of the device a-la NT4 and |
658 | * later and then from the middle of the device a-la NT3.51 and before. |
659 | * |
660 | * If a valid boot sector is found but it is not the primary boot sector, we |
661 | * repair the primary boot sector silently (unless the device is read-only or |
662 | * the primary boot sector is not accessible). |
663 | * |
664 | * NOTE: To call this function, @sb must have the fields s_dev, the ntfs super |
665 | * block (u.ntfs_sb), nr_blocks and the device flags (s_flags) initialized |
666 | * to their respective values. |
667 | * |
668 | * Return the unlocked buffer head containing the boot sector or NULL on error. |
669 | */ |
670 | static struct buffer_head *read_ntfs_boot_sector(struct super_block *sb, |
671 | const int silent) |
672 | { |
673 | const char *read_err_str = "Unable to read %s boot sector." ; |
674 | struct buffer_head *bh_primary, *bh_backup; |
675 | sector_t nr_blocks = NTFS_SB(sb)->nr_blocks; |
676 | |
677 | /* Try to read primary boot sector. */ |
678 | if ((bh_primary = sb_bread(sb, block: 0))) { |
679 | if (is_boot_sector_ntfs(sb, b: (NTFS_BOOT_SECTOR*) |
680 | bh_primary->b_data, silent)) |
681 | return bh_primary; |
682 | if (!silent) |
683 | ntfs_error(sb, "Primary boot sector is invalid." ); |
684 | } else if (!silent) |
685 | ntfs_error(sb, read_err_str, "primary" ); |
686 | if (!(NTFS_SB(sb)->on_errors & ON_ERRORS_RECOVER)) { |
687 | if (bh_primary) |
688 | brelse(bh: bh_primary); |
689 | if (!silent) |
690 | ntfs_error(sb, "Mount option errors=recover not used. " |
691 | "Aborting without trying to recover." ); |
692 | return NULL; |
693 | } |
694 | /* Try to read NT4+ backup boot sector. */ |
695 | if ((bh_backup = sb_bread(sb, block: nr_blocks - 1))) { |
696 | if (is_boot_sector_ntfs(sb, b: (NTFS_BOOT_SECTOR*) |
697 | bh_backup->b_data, silent)) |
698 | goto hotfix_primary_boot_sector; |
699 | brelse(bh: bh_backup); |
700 | } else if (!silent) |
701 | ntfs_error(sb, read_err_str, "backup" ); |
702 | /* Try to read NT3.51- backup boot sector. */ |
703 | if ((bh_backup = sb_bread(sb, block: nr_blocks >> 1))) { |
704 | if (is_boot_sector_ntfs(sb, b: (NTFS_BOOT_SECTOR*) |
705 | bh_backup->b_data, silent)) |
706 | goto hotfix_primary_boot_sector; |
707 | if (!silent) |
708 | ntfs_error(sb, "Could not find a valid backup boot " |
709 | "sector." ); |
710 | brelse(bh: bh_backup); |
711 | } else if (!silent) |
712 | ntfs_error(sb, read_err_str, "backup" ); |
713 | /* We failed. Cleanup and return. */ |
714 | if (bh_primary) |
715 | brelse(bh: bh_primary); |
716 | return NULL; |
717 | hotfix_primary_boot_sector: |
718 | if (bh_primary) { |
719 | /* |
720 | * If we managed to read sector zero and the volume is not |
721 | * read-only, copy the found, valid backup boot sector to the |
722 | * primary boot sector. Note we only copy the actual boot |
723 | * sector structure, not the actual whole device sector as that |
724 | * may be bigger and would potentially damage the $Boot system |
725 | * file (FIXME: Would be nice to know if the backup boot sector |
726 | * on a large sector device contains the whole boot loader or |
727 | * just the first 512 bytes). |
728 | */ |
729 | if (!sb_rdonly(sb)) { |
730 | ntfs_warning(sb, "Hot-fix: Recovering invalid primary " |
731 | "boot sector from backup copy." ); |
732 | memcpy(bh_primary->b_data, bh_backup->b_data, |
733 | NTFS_BLOCK_SIZE); |
734 | mark_buffer_dirty(bh: bh_primary); |
735 | sync_dirty_buffer(bh: bh_primary); |
736 | if (buffer_uptodate(bh: bh_primary)) { |
737 | brelse(bh: bh_backup); |
738 | return bh_primary; |
739 | } |
740 | ntfs_error(sb, "Hot-fix: Device write error while " |
741 | "recovering primary boot sector." ); |
742 | } else { |
743 | ntfs_warning(sb, "Hot-fix: Recovery of primary boot " |
744 | "sector failed: Read-only mount." ); |
745 | } |
746 | brelse(bh: bh_primary); |
747 | } |
748 | ntfs_warning(sb, "Using backup boot sector." ); |
749 | return bh_backup; |
750 | } |
751 | |
752 | /** |
753 | * parse_ntfs_boot_sector - parse the boot sector and store the data in @vol |
754 | * @vol: volume structure to initialise with data from boot sector |
755 | * @b: boot sector to parse |
756 | * |
757 | * Parse the ntfs boot sector @b and store all imporant information therein in |
758 | * the ntfs super block @vol. Return 'true' on success and 'false' on error. |
759 | */ |
760 | static bool parse_ntfs_boot_sector(ntfs_volume *vol, const NTFS_BOOT_SECTOR *b) |
761 | { |
762 | unsigned int sectors_per_cluster_bits, nr_hidden_sects; |
763 | int clusters_per_mft_record, clusters_per_index_record; |
764 | s64 ll; |
765 | |
766 | vol->sector_size = le16_to_cpu(b->bpb.bytes_per_sector); |
767 | vol->sector_size_bits = ffs(vol->sector_size) - 1; |
768 | ntfs_debug("vol->sector_size = %i (0x%x)" , vol->sector_size, |
769 | vol->sector_size); |
770 | ntfs_debug("vol->sector_size_bits = %i (0x%x)" , vol->sector_size_bits, |
771 | vol->sector_size_bits); |
772 | if (vol->sector_size < vol->sb->s_blocksize) { |
773 | ntfs_error(vol->sb, "Sector size (%i) is smaller than the " |
774 | "device block size (%lu). This is not " |
775 | "supported. Sorry." , vol->sector_size, |
776 | vol->sb->s_blocksize); |
777 | return false; |
778 | } |
779 | ntfs_debug("sectors_per_cluster = 0x%x" , b->bpb.sectors_per_cluster); |
780 | sectors_per_cluster_bits = ffs(b->bpb.sectors_per_cluster) - 1; |
781 | ntfs_debug("sectors_per_cluster_bits = 0x%x" , |
782 | sectors_per_cluster_bits); |
783 | nr_hidden_sects = le32_to_cpu(b->bpb.hidden_sectors); |
784 | ntfs_debug("number of hidden sectors = 0x%x" , nr_hidden_sects); |
785 | vol->cluster_size = vol->sector_size << sectors_per_cluster_bits; |
786 | vol->cluster_size_mask = vol->cluster_size - 1; |
787 | vol->cluster_size_bits = ffs(vol->cluster_size) - 1; |
788 | ntfs_debug("vol->cluster_size = %i (0x%x)" , vol->cluster_size, |
789 | vol->cluster_size); |
790 | ntfs_debug("vol->cluster_size_mask = 0x%x" , vol->cluster_size_mask); |
791 | ntfs_debug("vol->cluster_size_bits = %i" , vol->cluster_size_bits); |
792 | if (vol->cluster_size < vol->sector_size) { |
793 | ntfs_error(vol->sb, "Cluster size (%i) is smaller than the " |
794 | "sector size (%i). This is not supported. " |
795 | "Sorry." , vol->cluster_size, vol->sector_size); |
796 | return false; |
797 | } |
798 | clusters_per_mft_record = b->clusters_per_mft_record; |
799 | ntfs_debug("clusters_per_mft_record = %i (0x%x)" , |
800 | clusters_per_mft_record, clusters_per_mft_record); |
801 | if (clusters_per_mft_record > 0) |
802 | vol->mft_record_size = vol->cluster_size << |
803 | (ffs(clusters_per_mft_record) - 1); |
804 | else |
805 | /* |
806 | * When mft_record_size < cluster_size, clusters_per_mft_record |
807 | * = -log2(mft_record_size) bytes. mft_record_size normaly is |
808 | * 1024 bytes, which is encoded as 0xF6 (-10 in decimal). |
809 | */ |
810 | vol->mft_record_size = 1 << -clusters_per_mft_record; |
811 | vol->mft_record_size_mask = vol->mft_record_size - 1; |
812 | vol->mft_record_size_bits = ffs(vol->mft_record_size) - 1; |
813 | ntfs_debug("vol->mft_record_size = %i (0x%x)" , vol->mft_record_size, |
814 | vol->mft_record_size); |
815 | ntfs_debug("vol->mft_record_size_mask = 0x%x" , |
816 | vol->mft_record_size_mask); |
817 | ntfs_debug("vol->mft_record_size_bits = %i (0x%x)" , |
818 | vol->mft_record_size_bits, vol->mft_record_size_bits); |
819 | /* |
820 | * We cannot support mft record sizes above the PAGE_SIZE since |
821 | * we store $MFT/$DATA, the table of mft records in the page cache. |
822 | */ |
823 | if (vol->mft_record_size > PAGE_SIZE) { |
824 | ntfs_error(vol->sb, "Mft record size (%i) exceeds the " |
825 | "PAGE_SIZE on your system (%lu). " |
826 | "This is not supported. Sorry." , |
827 | vol->mft_record_size, PAGE_SIZE); |
828 | return false; |
829 | } |
830 | /* We cannot support mft record sizes below the sector size. */ |
831 | if (vol->mft_record_size < vol->sector_size) { |
832 | ntfs_error(vol->sb, "Mft record size (%i) is smaller than the " |
833 | "sector size (%i). This is not supported. " |
834 | "Sorry." , vol->mft_record_size, |
835 | vol->sector_size); |
836 | return false; |
837 | } |
838 | clusters_per_index_record = b->clusters_per_index_record; |
839 | ntfs_debug("clusters_per_index_record = %i (0x%x)" , |
840 | clusters_per_index_record, clusters_per_index_record); |
841 | if (clusters_per_index_record > 0) |
842 | vol->index_record_size = vol->cluster_size << |
843 | (ffs(clusters_per_index_record) - 1); |
844 | else |
845 | /* |
846 | * When index_record_size < cluster_size, |
847 | * clusters_per_index_record = -log2(index_record_size) bytes. |
848 | * index_record_size normaly equals 4096 bytes, which is |
849 | * encoded as 0xF4 (-12 in decimal). |
850 | */ |
851 | vol->index_record_size = 1 << -clusters_per_index_record; |
852 | vol->index_record_size_mask = vol->index_record_size - 1; |
853 | vol->index_record_size_bits = ffs(vol->index_record_size) - 1; |
854 | ntfs_debug("vol->index_record_size = %i (0x%x)" , |
855 | vol->index_record_size, vol->index_record_size); |
856 | ntfs_debug("vol->index_record_size_mask = 0x%x" , |
857 | vol->index_record_size_mask); |
858 | ntfs_debug("vol->index_record_size_bits = %i (0x%x)" , |
859 | vol->index_record_size_bits, |
860 | vol->index_record_size_bits); |
861 | /* We cannot support index record sizes below the sector size. */ |
862 | if (vol->index_record_size < vol->sector_size) { |
863 | ntfs_error(vol->sb, "Index record size (%i) is smaller than " |
864 | "the sector size (%i). This is not " |
865 | "supported. Sorry." , vol->index_record_size, |
866 | vol->sector_size); |
867 | return false; |
868 | } |
869 | /* |
870 | * Get the size of the volume in clusters and check for 64-bit-ness. |
871 | * Windows currently only uses 32 bits to save the clusters so we do |
872 | * the same as it is much faster on 32-bit CPUs. |
873 | */ |
874 | ll = sle64_to_cpu(x: b->number_of_sectors) >> sectors_per_cluster_bits; |
875 | if ((u64)ll >= 1ULL << 32) { |
876 | ntfs_error(vol->sb, "Cannot handle 64-bit clusters. Sorry." ); |
877 | return false; |
878 | } |
879 | vol->nr_clusters = ll; |
880 | ntfs_debug("vol->nr_clusters = 0x%llx" , (long long)vol->nr_clusters); |
881 | /* |
882 | * On an architecture where unsigned long is 32-bits, we restrict the |
883 | * volume size to 2TiB (2^41). On a 64-bit architecture, the compiler |
884 | * will hopefully optimize the whole check away. |
885 | */ |
886 | if (sizeof(unsigned long) < 8) { |
887 | if ((ll << vol->cluster_size_bits) >= (1ULL << 41)) { |
888 | ntfs_error(vol->sb, "Volume size (%lluTiB) is too " |
889 | "large for this architecture. " |
890 | "Maximum supported is 2TiB. Sorry." , |
891 | (unsigned long long)ll >> (40 - |
892 | vol->cluster_size_bits)); |
893 | return false; |
894 | } |
895 | } |
896 | ll = sle64_to_cpu(x: b->mft_lcn); |
897 | if (ll >= vol->nr_clusters) { |
898 | ntfs_error(vol->sb, "MFT LCN (%lli, 0x%llx) is beyond end of " |
899 | "volume. Weird." , (unsigned long long)ll, |
900 | (unsigned long long)ll); |
901 | return false; |
902 | } |
903 | vol->mft_lcn = ll; |
904 | ntfs_debug("vol->mft_lcn = 0x%llx" , (long long)vol->mft_lcn); |
905 | ll = sle64_to_cpu(x: b->mftmirr_lcn); |
906 | if (ll >= vol->nr_clusters) { |
907 | ntfs_error(vol->sb, "MFTMirr LCN (%lli, 0x%llx) is beyond end " |
908 | "of volume. Weird." , (unsigned long long)ll, |
909 | (unsigned long long)ll); |
910 | return false; |
911 | } |
912 | vol->mftmirr_lcn = ll; |
913 | ntfs_debug("vol->mftmirr_lcn = 0x%llx" , (long long)vol->mftmirr_lcn); |
914 | #ifdef NTFS_RW |
915 | /* |
916 | * Work out the size of the mft mirror in number of mft records. If the |
917 | * cluster size is less than or equal to the size taken by four mft |
918 | * records, the mft mirror stores the first four mft records. If the |
919 | * cluster size is bigger than the size taken by four mft records, the |
920 | * mft mirror contains as many mft records as will fit into one |
921 | * cluster. |
922 | */ |
923 | if (vol->cluster_size <= (4 << vol->mft_record_size_bits)) |
924 | vol->mftmirr_size = 4; |
925 | else |
926 | vol->mftmirr_size = vol->cluster_size >> |
927 | vol->mft_record_size_bits; |
928 | ntfs_debug("vol->mftmirr_size = %i" , vol->mftmirr_size); |
929 | #endif /* NTFS_RW */ |
930 | vol->serial_no = le64_to_cpu(b->volume_serial_number); |
931 | ntfs_debug("vol->serial_no = 0x%llx" , |
932 | (unsigned long long)vol->serial_no); |
933 | return true; |
934 | } |
935 | |
936 | /** |
937 | * ntfs_setup_allocators - initialize the cluster and mft allocators |
938 | * @vol: volume structure for which to setup the allocators |
939 | * |
940 | * Setup the cluster (lcn) and mft allocators to the starting values. |
941 | */ |
942 | static void ntfs_setup_allocators(ntfs_volume *vol) |
943 | { |
944 | #ifdef NTFS_RW |
945 | LCN mft_zone_size, mft_lcn; |
946 | #endif /* NTFS_RW */ |
947 | |
948 | ntfs_debug("vol->mft_zone_multiplier = 0x%x" , |
949 | vol->mft_zone_multiplier); |
950 | #ifdef NTFS_RW |
951 | /* Determine the size of the MFT zone. */ |
952 | mft_zone_size = vol->nr_clusters; |
953 | switch (vol->mft_zone_multiplier) { /* % of volume size in clusters */ |
954 | case 4: |
955 | mft_zone_size >>= 1; /* 50% */ |
956 | break; |
957 | case 3: |
958 | mft_zone_size = (mft_zone_size + |
959 | (mft_zone_size >> 1)) >> 2; /* 37.5% */ |
960 | break; |
961 | case 2: |
962 | mft_zone_size >>= 2; /* 25% */ |
963 | break; |
964 | /* case 1: */ |
965 | default: |
966 | mft_zone_size >>= 3; /* 12.5% */ |
967 | break; |
968 | } |
969 | /* Setup the mft zone. */ |
970 | vol->mft_zone_start = vol->mft_zone_pos = vol->mft_lcn; |
971 | ntfs_debug("vol->mft_zone_pos = 0x%llx" , |
972 | (unsigned long long)vol->mft_zone_pos); |
973 | /* |
974 | * Calculate the mft_lcn for an unmodified NTFS volume (see mkntfs |
975 | * source) and if the actual mft_lcn is in the expected place or even |
976 | * further to the front of the volume, extend the mft_zone to cover the |
977 | * beginning of the volume as well. This is in order to protect the |
978 | * area reserved for the mft bitmap as well within the mft_zone itself. |
979 | * On non-standard volumes we do not protect it as the overhead would |
980 | * be higher than the speed increase we would get by doing it. |
981 | */ |
982 | mft_lcn = (8192 + 2 * vol->cluster_size - 1) / vol->cluster_size; |
983 | if (mft_lcn * vol->cluster_size < 16 * 1024) |
984 | mft_lcn = (16 * 1024 + vol->cluster_size - 1) / |
985 | vol->cluster_size; |
986 | if (vol->mft_zone_start <= mft_lcn) |
987 | vol->mft_zone_start = 0; |
988 | ntfs_debug("vol->mft_zone_start = 0x%llx" , |
989 | (unsigned long long)vol->mft_zone_start); |
990 | /* |
991 | * Need to cap the mft zone on non-standard volumes so that it does |
992 | * not point outside the boundaries of the volume. We do this by |
993 | * halving the zone size until we are inside the volume. |
994 | */ |
995 | vol->mft_zone_end = vol->mft_lcn + mft_zone_size; |
996 | while (vol->mft_zone_end >= vol->nr_clusters) { |
997 | mft_zone_size >>= 1; |
998 | vol->mft_zone_end = vol->mft_lcn + mft_zone_size; |
999 | } |
1000 | ntfs_debug("vol->mft_zone_end = 0x%llx" , |
1001 | (unsigned long long)vol->mft_zone_end); |
1002 | /* |
1003 | * Set the current position within each data zone to the start of the |
1004 | * respective zone. |
1005 | */ |
1006 | vol->data1_zone_pos = vol->mft_zone_end; |
1007 | ntfs_debug("vol->data1_zone_pos = 0x%llx" , |
1008 | (unsigned long long)vol->data1_zone_pos); |
1009 | vol->data2_zone_pos = 0; |
1010 | ntfs_debug("vol->data2_zone_pos = 0x%llx" , |
1011 | (unsigned long long)vol->data2_zone_pos); |
1012 | |
1013 | /* Set the mft data allocation position to mft record 24. */ |
1014 | vol->mft_data_pos = 24; |
1015 | ntfs_debug("vol->mft_data_pos = 0x%llx" , |
1016 | (unsigned long long)vol->mft_data_pos); |
1017 | #endif /* NTFS_RW */ |
1018 | } |
1019 | |
1020 | #ifdef NTFS_RW |
1021 | |
1022 | /** |
1023 | * load_and_init_mft_mirror - load and setup the mft mirror inode for a volume |
1024 | * @vol: ntfs super block describing device whose mft mirror to load |
1025 | * |
1026 | * Return 'true' on success or 'false' on error. |
1027 | */ |
1028 | static bool load_and_init_mft_mirror(ntfs_volume *vol) |
1029 | { |
1030 | struct inode *tmp_ino; |
1031 | ntfs_inode *tmp_ni; |
1032 | |
1033 | ntfs_debug("Entering." ); |
1034 | /* Get mft mirror inode. */ |
1035 | tmp_ino = ntfs_iget(sb: vol->sb, mft_no: FILE_MFTMirr); |
1036 | if (IS_ERR(ptr: tmp_ino) || is_bad_inode(tmp_ino)) { |
1037 | if (!IS_ERR(ptr: tmp_ino)) |
1038 | iput(tmp_ino); |
1039 | /* Caller will display error message. */ |
1040 | return false; |
1041 | } |
1042 | /* |
1043 | * Re-initialize some specifics about $MFTMirr's inode as |
1044 | * ntfs_read_inode() will have set up the default ones. |
1045 | */ |
1046 | /* Set uid and gid to root. */ |
1047 | tmp_ino->i_uid = GLOBAL_ROOT_UID; |
1048 | tmp_ino->i_gid = GLOBAL_ROOT_GID; |
1049 | /* Regular file. No access for anyone. */ |
1050 | tmp_ino->i_mode = S_IFREG; |
1051 | /* No VFS initiated operations allowed for $MFTMirr. */ |
1052 | tmp_ino->i_op = &ntfs_empty_inode_ops; |
1053 | tmp_ino->i_fop = &ntfs_empty_file_ops; |
1054 | /* Put in our special address space operations. */ |
1055 | tmp_ino->i_mapping->a_ops = &ntfs_mst_aops; |
1056 | tmp_ni = NTFS_I(tmp_ino); |
1057 | /* The $MFTMirr, like the $MFT is multi sector transfer protected. */ |
1058 | NInoSetMstProtected(tmp_ni); |
1059 | NInoSetSparseDisabled(tmp_ni); |
1060 | /* |
1061 | * Set up our little cheat allowing us to reuse the async read io |
1062 | * completion handler for directories. |
1063 | */ |
1064 | tmp_ni->itype.index.block_size = vol->mft_record_size; |
1065 | tmp_ni->itype.index.block_size_bits = vol->mft_record_size_bits; |
1066 | vol->mftmirr_ino = tmp_ino; |
1067 | ntfs_debug("Done." ); |
1068 | return true; |
1069 | } |
1070 | |
1071 | /** |
1072 | * check_mft_mirror - compare contents of the mft mirror with the mft |
1073 | * @vol: ntfs super block describing device whose mft mirror to check |
1074 | * |
1075 | * Return 'true' on success or 'false' on error. |
1076 | * |
1077 | * Note, this function also results in the mft mirror runlist being completely |
1078 | * mapped into memory. The mft mirror write code requires this and will BUG() |
1079 | * should it find an unmapped runlist element. |
1080 | */ |
1081 | static bool check_mft_mirror(ntfs_volume *vol) |
1082 | { |
1083 | struct super_block *sb = vol->sb; |
1084 | ntfs_inode *mirr_ni; |
1085 | struct page *mft_page, *mirr_page; |
1086 | u8 *kmft, *kmirr; |
1087 | runlist_element *rl, rl2[2]; |
1088 | pgoff_t index; |
1089 | int mrecs_per_page, i; |
1090 | |
1091 | ntfs_debug("Entering." ); |
1092 | /* Compare contents of $MFT and $MFTMirr. */ |
1093 | mrecs_per_page = PAGE_SIZE / vol->mft_record_size; |
1094 | BUG_ON(!mrecs_per_page); |
1095 | BUG_ON(!vol->mftmirr_size); |
1096 | mft_page = mirr_page = NULL; |
1097 | kmft = kmirr = NULL; |
1098 | index = i = 0; |
1099 | do { |
1100 | u32 bytes; |
1101 | |
1102 | /* Switch pages if necessary. */ |
1103 | if (!(i % mrecs_per_page)) { |
1104 | if (index) { |
1105 | ntfs_unmap_page(page: mft_page); |
1106 | ntfs_unmap_page(page: mirr_page); |
1107 | } |
1108 | /* Get the $MFT page. */ |
1109 | mft_page = ntfs_map_page(mapping: vol->mft_ino->i_mapping, |
1110 | index); |
1111 | if (IS_ERR(ptr: mft_page)) { |
1112 | ntfs_error(sb, "Failed to read $MFT." ); |
1113 | return false; |
1114 | } |
1115 | kmft = page_address(mft_page); |
1116 | /* Get the $MFTMirr page. */ |
1117 | mirr_page = ntfs_map_page(mapping: vol->mftmirr_ino->i_mapping, |
1118 | index); |
1119 | if (IS_ERR(ptr: mirr_page)) { |
1120 | ntfs_error(sb, "Failed to read $MFTMirr." ); |
1121 | goto mft_unmap_out; |
1122 | } |
1123 | kmirr = page_address(mirr_page); |
1124 | ++index; |
1125 | } |
1126 | /* Do not check the record if it is not in use. */ |
1127 | if (((MFT_RECORD*)kmft)->flags & MFT_RECORD_IN_USE) { |
1128 | /* Make sure the record is ok. */ |
1129 | if (ntfs_is_baad_recordp((le32*)kmft)) { |
1130 | ntfs_error(sb, "Incomplete multi sector " |
1131 | "transfer detected in mft " |
1132 | "record %i." , i); |
1133 | mm_unmap_out: |
1134 | ntfs_unmap_page(page: mirr_page); |
1135 | mft_unmap_out: |
1136 | ntfs_unmap_page(page: mft_page); |
1137 | return false; |
1138 | } |
1139 | } |
1140 | /* Do not check the mirror record if it is not in use. */ |
1141 | if (((MFT_RECORD*)kmirr)->flags & MFT_RECORD_IN_USE) { |
1142 | if (ntfs_is_baad_recordp((le32*)kmirr)) { |
1143 | ntfs_error(sb, "Incomplete multi sector " |
1144 | "transfer detected in mft " |
1145 | "mirror record %i." , i); |
1146 | goto mm_unmap_out; |
1147 | } |
1148 | } |
1149 | /* Get the amount of data in the current record. */ |
1150 | bytes = le32_to_cpu(((MFT_RECORD*)kmft)->bytes_in_use); |
1151 | if (bytes < sizeof(MFT_RECORD_OLD) || |
1152 | bytes > vol->mft_record_size || |
1153 | ntfs_is_baad_recordp((le32*)kmft)) { |
1154 | bytes = le32_to_cpu(((MFT_RECORD*)kmirr)->bytes_in_use); |
1155 | if (bytes < sizeof(MFT_RECORD_OLD) || |
1156 | bytes > vol->mft_record_size || |
1157 | ntfs_is_baad_recordp((le32*)kmirr)) |
1158 | bytes = vol->mft_record_size; |
1159 | } |
1160 | /* Compare the two records. */ |
1161 | if (memcmp(p: kmft, q: kmirr, size: bytes)) { |
1162 | ntfs_error(sb, "$MFT and $MFTMirr (record %i) do not " |
1163 | "match. Run ntfsfix or chkdsk." , i); |
1164 | goto mm_unmap_out; |
1165 | } |
1166 | kmft += vol->mft_record_size; |
1167 | kmirr += vol->mft_record_size; |
1168 | } while (++i < vol->mftmirr_size); |
1169 | /* Release the last pages. */ |
1170 | ntfs_unmap_page(page: mft_page); |
1171 | ntfs_unmap_page(page: mirr_page); |
1172 | |
1173 | /* Construct the mft mirror runlist by hand. */ |
1174 | rl2[0].vcn = 0; |
1175 | rl2[0].lcn = vol->mftmirr_lcn; |
1176 | rl2[0].length = (vol->mftmirr_size * vol->mft_record_size + |
1177 | vol->cluster_size - 1) / vol->cluster_size; |
1178 | rl2[1].vcn = rl2[0].length; |
1179 | rl2[1].lcn = LCN_ENOENT; |
1180 | rl2[1].length = 0; |
1181 | /* |
1182 | * Because we have just read all of the mft mirror, we know we have |
1183 | * mapped the full runlist for it. |
1184 | */ |
1185 | mirr_ni = NTFS_I(inode: vol->mftmirr_ino); |
1186 | down_read(sem: &mirr_ni->runlist.lock); |
1187 | rl = mirr_ni->runlist.rl; |
1188 | /* Compare the two runlists. They must be identical. */ |
1189 | i = 0; |
1190 | do { |
1191 | if (rl2[i].vcn != rl[i].vcn || rl2[i].lcn != rl[i].lcn || |
1192 | rl2[i].length != rl[i].length) { |
1193 | ntfs_error(sb, "$MFTMirr location mismatch. " |
1194 | "Run chkdsk." ); |
1195 | up_read(sem: &mirr_ni->runlist.lock); |
1196 | return false; |
1197 | } |
1198 | } while (rl2[i++].length); |
1199 | up_read(sem: &mirr_ni->runlist.lock); |
1200 | ntfs_debug("Done." ); |
1201 | return true; |
1202 | } |
1203 | |
1204 | /** |
1205 | * load_and_check_logfile - load and check the logfile inode for a volume |
1206 | * @vol: ntfs super block describing device whose logfile to load |
1207 | * |
1208 | * Return 'true' on success or 'false' on error. |
1209 | */ |
1210 | static bool load_and_check_logfile(ntfs_volume *vol, |
1211 | RESTART_PAGE_HEADER **rp) |
1212 | { |
1213 | struct inode *tmp_ino; |
1214 | |
1215 | ntfs_debug("Entering." ); |
1216 | tmp_ino = ntfs_iget(sb: vol->sb, mft_no: FILE_LogFile); |
1217 | if (IS_ERR(ptr: tmp_ino) || is_bad_inode(tmp_ino)) { |
1218 | if (!IS_ERR(ptr: tmp_ino)) |
1219 | iput(tmp_ino); |
1220 | /* Caller will display error message. */ |
1221 | return false; |
1222 | } |
1223 | if (!ntfs_check_logfile(log_vi: tmp_ino, rp)) { |
1224 | iput(tmp_ino); |
1225 | /* ntfs_check_logfile() will have displayed error output. */ |
1226 | return false; |
1227 | } |
1228 | NInoSetSparseDisabled(ni: NTFS_I(inode: tmp_ino)); |
1229 | vol->logfile_ino = tmp_ino; |
1230 | ntfs_debug("Done." ); |
1231 | return true; |
1232 | } |
1233 | |
1234 | #define 4096 |
1235 | |
1236 | /** |
1237 | * check_windows_hibernation_status - check if Windows is suspended on a volume |
1238 | * @vol: ntfs super block of device to check |
1239 | * |
1240 | * Check if Windows is hibernated on the ntfs volume @vol. This is done by |
1241 | * looking for the file hiberfil.sys in the root directory of the volume. If |
1242 | * the file is not present Windows is definitely not suspended. |
1243 | * |
1244 | * If hiberfil.sys exists and is less than 4kiB in size it means Windows is |
1245 | * definitely suspended (this volume is not the system volume). Caveat: on a |
1246 | * system with many volumes it is possible that the < 4kiB check is bogus but |
1247 | * for now this should do fine. |
1248 | * |
1249 | * If hiberfil.sys exists and is larger than 4kiB in size, we need to read the |
1250 | * hiberfil header (which is the first 4kiB). If this begins with "hibr", |
1251 | * Windows is definitely suspended. If it is completely full of zeroes, |
1252 | * Windows is definitely not hibernated. Any other case is treated as if |
1253 | * Windows is suspended. This caters for the above mentioned caveat of a |
1254 | * system with many volumes where no "hibr" magic would be present and there is |
1255 | * no zero header. |
1256 | * |
1257 | * Return 0 if Windows is not hibernated on the volume, >0 if Windows is |
1258 | * hibernated on the volume, and -errno on error. |
1259 | */ |
1260 | static int check_windows_hibernation_status(ntfs_volume *vol) |
1261 | { |
1262 | MFT_REF mref; |
1263 | struct inode *vi; |
1264 | struct page *page; |
1265 | u32 *kaddr, *kend; |
1266 | ntfs_name *name = NULL; |
1267 | int ret = 1; |
1268 | static const ntfschar hiberfil[13] = { cpu_to_le16('h'), |
1269 | cpu_to_le16('i'), cpu_to_le16('b'), |
1270 | cpu_to_le16('e'), cpu_to_le16('r'), |
1271 | cpu_to_le16('f'), cpu_to_le16('i'), |
1272 | cpu_to_le16('l'), cpu_to_le16('.'), |
1273 | cpu_to_le16('s'), cpu_to_le16('y'), |
1274 | cpu_to_le16('s'), 0 }; |
1275 | |
1276 | ntfs_debug("Entering." ); |
1277 | /* |
1278 | * Find the inode number for the hibernation file by looking up the |
1279 | * filename hiberfil.sys in the root directory. |
1280 | */ |
1281 | inode_lock(inode: vol->root_ino); |
1282 | mref = ntfs_lookup_inode_by_name(dir_ni: NTFS_I(inode: vol->root_ino), uname: hiberfil, uname_len: 12, |
1283 | res: &name); |
1284 | inode_unlock(inode: vol->root_ino); |
1285 | if (IS_ERR_MREF(mref)) { |
1286 | ret = MREF_ERR(mref); |
1287 | /* If the file does not exist, Windows is not hibernated. */ |
1288 | if (ret == -ENOENT) { |
1289 | ntfs_debug("hiberfil.sys not present. Windows is not " |
1290 | "hibernated on the volume." ); |
1291 | return 0; |
1292 | } |
1293 | /* A real error occurred. */ |
1294 | ntfs_error(vol->sb, "Failed to find inode number for " |
1295 | "hiberfil.sys." ); |
1296 | return ret; |
1297 | } |
1298 | /* We do not care for the type of match that was found. */ |
1299 | kfree(objp: name); |
1300 | /* Get the inode. */ |
1301 | vi = ntfs_iget(sb: vol->sb, MREF(mref)); |
1302 | if (IS_ERR(ptr: vi) || is_bad_inode(vi)) { |
1303 | if (!IS_ERR(ptr: vi)) |
1304 | iput(vi); |
1305 | ntfs_error(vol->sb, "Failed to load hiberfil.sys." ); |
1306 | return IS_ERR(ptr: vi) ? PTR_ERR(ptr: vi) : -EIO; |
1307 | } |
1308 | if (unlikely(i_size_read(vi) < NTFS_HIBERFIL_HEADER_SIZE)) { |
1309 | ntfs_debug("hiberfil.sys is smaller than 4kiB (0x%llx). " |
1310 | "Windows is hibernated on the volume. This " |
1311 | "is not the system volume." , i_size_read(vi)); |
1312 | goto iput_out; |
1313 | } |
1314 | page = ntfs_map_page(mapping: vi->i_mapping, index: 0); |
1315 | if (IS_ERR(ptr: page)) { |
1316 | ntfs_error(vol->sb, "Failed to read from hiberfil.sys." ); |
1317 | ret = PTR_ERR(ptr: page); |
1318 | goto iput_out; |
1319 | } |
1320 | kaddr = (u32*)page_address(page); |
1321 | if (*(le32*)kaddr == cpu_to_le32(0x72626968)/*'hibr'*/) { |
1322 | ntfs_debug("Magic \"hibr\" found in hiberfil.sys. Windows is " |
1323 | "hibernated on the volume. This is the " |
1324 | "system volume." ); |
1325 | goto unm_iput_out; |
1326 | } |
1327 | kend = kaddr + NTFS_HIBERFIL_HEADER_SIZE/sizeof(*kaddr); |
1328 | do { |
1329 | if (unlikely(*kaddr)) { |
1330 | ntfs_debug("hiberfil.sys is larger than 4kiB " |
1331 | "(0x%llx), does not contain the " |
1332 | "\"hibr\" magic, and does not have a " |
1333 | "zero header. Windows is hibernated " |
1334 | "on the volume. This is not the " |
1335 | "system volume." , i_size_read(vi)); |
1336 | goto unm_iput_out; |
1337 | } |
1338 | } while (++kaddr < kend); |
1339 | ntfs_debug("hiberfil.sys contains a zero header. Windows is not " |
1340 | "hibernated on the volume. This is the system " |
1341 | "volume." ); |
1342 | ret = 0; |
1343 | unm_iput_out: |
1344 | ntfs_unmap_page(page); |
1345 | iput_out: |
1346 | iput(vi); |
1347 | return ret; |
1348 | } |
1349 | |
1350 | /** |
1351 | * load_and_init_quota - load and setup the quota file for a volume if present |
1352 | * @vol: ntfs super block describing device whose quota file to load |
1353 | * |
1354 | * Return 'true' on success or 'false' on error. If $Quota is not present, we |
1355 | * leave vol->quota_ino as NULL and return success. |
1356 | */ |
1357 | static bool load_and_init_quota(ntfs_volume *vol) |
1358 | { |
1359 | MFT_REF mref; |
1360 | struct inode *tmp_ino; |
1361 | ntfs_name *name = NULL; |
1362 | static const ntfschar Quota[7] = { cpu_to_le16('$'), |
1363 | cpu_to_le16('Q'), cpu_to_le16('u'), |
1364 | cpu_to_le16('o'), cpu_to_le16('t'), |
1365 | cpu_to_le16('a'), 0 }; |
1366 | static ntfschar Q[3] = { cpu_to_le16('$'), |
1367 | cpu_to_le16('Q'), 0 }; |
1368 | |
1369 | ntfs_debug("Entering." ); |
1370 | /* |
1371 | * Find the inode number for the quota file by looking up the filename |
1372 | * $Quota in the extended system files directory $Extend. |
1373 | */ |
1374 | inode_lock(inode: vol->extend_ino); |
1375 | mref = ntfs_lookup_inode_by_name(dir_ni: NTFS_I(inode: vol->extend_ino), uname: Quota, uname_len: 6, |
1376 | res: &name); |
1377 | inode_unlock(inode: vol->extend_ino); |
1378 | if (IS_ERR_MREF(mref)) { |
1379 | /* |
1380 | * If the file does not exist, quotas are disabled and have |
1381 | * never been enabled on this volume, just return success. |
1382 | */ |
1383 | if (MREF_ERR(mref) == -ENOENT) { |
1384 | ntfs_debug("$Quota not present. Volume does not have " |
1385 | "quotas enabled." ); |
1386 | /* |
1387 | * No need to try to set quotas out of date if they are |
1388 | * not enabled. |
1389 | */ |
1390 | NVolSetQuotaOutOfDate(vol); |
1391 | return true; |
1392 | } |
1393 | /* A real error occurred. */ |
1394 | ntfs_error(vol->sb, "Failed to find inode number for $Quota." ); |
1395 | return false; |
1396 | } |
1397 | /* We do not care for the type of match that was found. */ |
1398 | kfree(objp: name); |
1399 | /* Get the inode. */ |
1400 | tmp_ino = ntfs_iget(sb: vol->sb, MREF(mref)); |
1401 | if (IS_ERR(ptr: tmp_ino) || is_bad_inode(tmp_ino)) { |
1402 | if (!IS_ERR(ptr: tmp_ino)) |
1403 | iput(tmp_ino); |
1404 | ntfs_error(vol->sb, "Failed to load $Quota." ); |
1405 | return false; |
1406 | } |
1407 | vol->quota_ino = tmp_ino; |
1408 | /* Get the $Q index allocation attribute. */ |
1409 | tmp_ino = ntfs_index_iget(base_vi: vol->quota_ino, name: Q, name_len: 2); |
1410 | if (IS_ERR(ptr: tmp_ino)) { |
1411 | ntfs_error(vol->sb, "Failed to load $Quota/$Q index." ); |
1412 | return false; |
1413 | } |
1414 | vol->quota_q_ino = tmp_ino; |
1415 | ntfs_debug("Done." ); |
1416 | return true; |
1417 | } |
1418 | |
1419 | /** |
1420 | * load_and_init_usnjrnl - load and setup the transaction log if present |
1421 | * @vol: ntfs super block describing device whose usnjrnl file to load |
1422 | * |
1423 | * Return 'true' on success or 'false' on error. |
1424 | * |
1425 | * If $UsnJrnl is not present or in the process of being disabled, we set |
1426 | * NVolUsnJrnlStamped() and return success. |
1427 | * |
1428 | * If the $UsnJrnl $DATA/$J attribute has a size equal to the lowest valid usn, |
1429 | * i.e. transaction logging has only just been enabled or the journal has been |
1430 | * stamped and nothing has been logged since, we also set NVolUsnJrnlStamped() |
1431 | * and return success. |
1432 | */ |
1433 | static bool load_and_init_usnjrnl(ntfs_volume *vol) |
1434 | { |
1435 | MFT_REF mref; |
1436 | struct inode *tmp_ino; |
1437 | ntfs_inode *tmp_ni; |
1438 | struct page *page; |
1439 | ntfs_name *name = NULL; |
1440 | USN_HEADER *uh; |
1441 | static const ntfschar UsnJrnl[9] = { cpu_to_le16('$'), |
1442 | cpu_to_le16('U'), cpu_to_le16('s'), |
1443 | cpu_to_le16('n'), cpu_to_le16('J'), |
1444 | cpu_to_le16('r'), cpu_to_le16('n'), |
1445 | cpu_to_le16('l'), 0 }; |
1446 | static ntfschar Max[5] = { cpu_to_le16('$'), |
1447 | cpu_to_le16('M'), cpu_to_le16('a'), |
1448 | cpu_to_le16('x'), 0 }; |
1449 | static ntfschar J[3] = { cpu_to_le16('$'), |
1450 | cpu_to_le16('J'), 0 }; |
1451 | |
1452 | ntfs_debug("Entering." ); |
1453 | /* |
1454 | * Find the inode number for the transaction log file by looking up the |
1455 | * filename $UsnJrnl in the extended system files directory $Extend. |
1456 | */ |
1457 | inode_lock(inode: vol->extend_ino); |
1458 | mref = ntfs_lookup_inode_by_name(dir_ni: NTFS_I(inode: vol->extend_ino), uname: UsnJrnl, uname_len: 8, |
1459 | res: &name); |
1460 | inode_unlock(inode: vol->extend_ino); |
1461 | if (IS_ERR_MREF(mref)) { |
1462 | /* |
1463 | * If the file does not exist, transaction logging is disabled, |
1464 | * just return success. |
1465 | */ |
1466 | if (MREF_ERR(mref) == -ENOENT) { |
1467 | ntfs_debug("$UsnJrnl not present. Volume does not " |
1468 | "have transaction logging enabled." ); |
1469 | not_enabled: |
1470 | /* |
1471 | * No need to try to stamp the transaction log if |
1472 | * transaction logging is not enabled. |
1473 | */ |
1474 | NVolSetUsnJrnlStamped(vol); |
1475 | return true; |
1476 | } |
1477 | /* A real error occurred. */ |
1478 | ntfs_error(vol->sb, "Failed to find inode number for " |
1479 | "$UsnJrnl." ); |
1480 | return false; |
1481 | } |
1482 | /* We do not care for the type of match that was found. */ |
1483 | kfree(objp: name); |
1484 | /* Get the inode. */ |
1485 | tmp_ino = ntfs_iget(sb: vol->sb, MREF(mref)); |
1486 | if (IS_ERR(ptr: tmp_ino) || unlikely(is_bad_inode(tmp_ino))) { |
1487 | if (!IS_ERR(ptr: tmp_ino)) |
1488 | iput(tmp_ino); |
1489 | ntfs_error(vol->sb, "Failed to load $UsnJrnl." ); |
1490 | return false; |
1491 | } |
1492 | vol->usnjrnl_ino = tmp_ino; |
1493 | /* |
1494 | * If the transaction log is in the process of being deleted, we can |
1495 | * ignore it. |
1496 | */ |
1497 | if (unlikely(vol->vol_flags & VOLUME_DELETE_USN_UNDERWAY)) { |
1498 | ntfs_debug("$UsnJrnl in the process of being disabled. " |
1499 | "Volume does not have transaction logging " |
1500 | "enabled." ); |
1501 | goto not_enabled; |
1502 | } |
1503 | /* Get the $DATA/$Max attribute. */ |
1504 | tmp_ino = ntfs_attr_iget(base_vi: vol->usnjrnl_ino, type: AT_DATA, name: Max, name_len: 4); |
1505 | if (IS_ERR(ptr: tmp_ino)) { |
1506 | ntfs_error(vol->sb, "Failed to load $UsnJrnl/$DATA/$Max " |
1507 | "attribute." ); |
1508 | return false; |
1509 | } |
1510 | vol->usnjrnl_max_ino = tmp_ino; |
1511 | if (unlikely(i_size_read(tmp_ino) < sizeof(USN_HEADER))) { |
1512 | ntfs_error(vol->sb, "Found corrupt $UsnJrnl/$DATA/$Max " |
1513 | "attribute (size is 0x%llx but should be at " |
1514 | "least 0x%zx bytes)." , i_size_read(tmp_ino), |
1515 | sizeof(USN_HEADER)); |
1516 | return false; |
1517 | } |
1518 | /* Get the $DATA/$J attribute. */ |
1519 | tmp_ino = ntfs_attr_iget(base_vi: vol->usnjrnl_ino, type: AT_DATA, name: J, name_len: 2); |
1520 | if (IS_ERR(ptr: tmp_ino)) { |
1521 | ntfs_error(vol->sb, "Failed to load $UsnJrnl/$DATA/$J " |
1522 | "attribute." ); |
1523 | return false; |
1524 | } |
1525 | vol->usnjrnl_j_ino = tmp_ino; |
1526 | /* Verify $J is non-resident and sparse. */ |
1527 | tmp_ni = NTFS_I(inode: vol->usnjrnl_j_ino); |
1528 | if (unlikely(!NInoNonResident(tmp_ni) || !NInoSparse(tmp_ni))) { |
1529 | ntfs_error(vol->sb, "$UsnJrnl/$DATA/$J attribute is resident " |
1530 | "and/or not sparse." ); |
1531 | return false; |
1532 | } |
1533 | /* Read the USN_HEADER from $DATA/$Max. */ |
1534 | page = ntfs_map_page(mapping: vol->usnjrnl_max_ino->i_mapping, index: 0); |
1535 | if (IS_ERR(ptr: page)) { |
1536 | ntfs_error(vol->sb, "Failed to read from $UsnJrnl/$DATA/$Max " |
1537 | "attribute." ); |
1538 | return false; |
1539 | } |
1540 | uh = (USN_HEADER*)page_address(page); |
1541 | /* Sanity check the $Max. */ |
1542 | if (unlikely(sle64_to_cpu(uh->allocation_delta) > |
1543 | sle64_to_cpu(uh->maximum_size))) { |
1544 | ntfs_error(vol->sb, "Allocation delta (0x%llx) exceeds " |
1545 | "maximum size (0x%llx). $UsnJrnl is corrupt." , |
1546 | (long long)sle64_to_cpu(uh->allocation_delta), |
1547 | (long long)sle64_to_cpu(uh->maximum_size)); |
1548 | ntfs_unmap_page(page); |
1549 | return false; |
1550 | } |
1551 | /* |
1552 | * If the transaction log has been stamped and nothing has been written |
1553 | * to it since, we do not need to stamp it. |
1554 | */ |
1555 | if (unlikely(sle64_to_cpu(uh->lowest_valid_usn) >= |
1556 | i_size_read(vol->usnjrnl_j_ino))) { |
1557 | if (likely(sle64_to_cpu(uh->lowest_valid_usn) == |
1558 | i_size_read(vol->usnjrnl_j_ino))) { |
1559 | ntfs_unmap_page(page); |
1560 | ntfs_debug("$UsnJrnl is enabled but nothing has been " |
1561 | "logged since it was last stamped. " |
1562 | "Treating this as if the volume does " |
1563 | "not have transaction logging " |
1564 | "enabled." ); |
1565 | goto not_enabled; |
1566 | } |
1567 | ntfs_error(vol->sb, "$UsnJrnl has lowest valid usn (0x%llx) " |
1568 | "which is out of bounds (0x%llx). $UsnJrnl " |
1569 | "is corrupt." , |
1570 | (long long)sle64_to_cpu(uh->lowest_valid_usn), |
1571 | i_size_read(vol->usnjrnl_j_ino)); |
1572 | ntfs_unmap_page(page); |
1573 | return false; |
1574 | } |
1575 | ntfs_unmap_page(page); |
1576 | ntfs_debug("Done." ); |
1577 | return true; |
1578 | } |
1579 | |
1580 | /** |
1581 | * load_and_init_attrdef - load the attribute definitions table for a volume |
1582 | * @vol: ntfs super block describing device whose attrdef to load |
1583 | * |
1584 | * Return 'true' on success or 'false' on error. |
1585 | */ |
1586 | static bool load_and_init_attrdef(ntfs_volume *vol) |
1587 | { |
1588 | loff_t i_size; |
1589 | struct super_block *sb = vol->sb; |
1590 | struct inode *ino; |
1591 | struct page *page; |
1592 | pgoff_t index, max_index; |
1593 | unsigned int size; |
1594 | |
1595 | ntfs_debug("Entering." ); |
1596 | /* Read attrdef table and setup vol->attrdef and vol->attrdef_size. */ |
1597 | ino = ntfs_iget(sb, mft_no: FILE_AttrDef); |
1598 | if (IS_ERR(ptr: ino) || is_bad_inode(ino)) { |
1599 | if (!IS_ERR(ptr: ino)) |
1600 | iput(ino); |
1601 | goto failed; |
1602 | } |
1603 | NInoSetSparseDisabled(ni: NTFS_I(inode: ino)); |
1604 | /* The size of FILE_AttrDef must be above 0 and fit inside 31 bits. */ |
1605 | i_size = i_size_read(inode: ino); |
1606 | if (i_size <= 0 || i_size > 0x7fffffff) |
1607 | goto iput_failed; |
1608 | vol->attrdef = (ATTR_DEF*)ntfs_malloc_nofs(size: i_size); |
1609 | if (!vol->attrdef) |
1610 | goto iput_failed; |
1611 | index = 0; |
1612 | max_index = i_size >> PAGE_SHIFT; |
1613 | size = PAGE_SIZE; |
1614 | while (index < max_index) { |
1615 | /* Read the attrdef table and copy it into the linear buffer. */ |
1616 | read_partial_attrdef_page: |
1617 | page = ntfs_map_page(mapping: ino->i_mapping, index); |
1618 | if (IS_ERR(ptr: page)) |
1619 | goto free_iput_failed; |
1620 | memcpy((u8*)vol->attrdef + (index++ << PAGE_SHIFT), |
1621 | page_address(page), size); |
1622 | ntfs_unmap_page(page); |
1623 | } |
1624 | if (size == PAGE_SIZE) { |
1625 | size = i_size & ~PAGE_MASK; |
1626 | if (size) |
1627 | goto read_partial_attrdef_page; |
1628 | } |
1629 | vol->attrdef_size = i_size; |
1630 | ntfs_debug("Read %llu bytes from $AttrDef." , i_size); |
1631 | iput(ino); |
1632 | return true; |
1633 | free_iput_failed: |
1634 | ntfs_free(addr: vol->attrdef); |
1635 | vol->attrdef = NULL; |
1636 | iput_failed: |
1637 | iput(ino); |
1638 | failed: |
1639 | ntfs_error(sb, "Failed to initialize attribute definition table." ); |
1640 | return false; |
1641 | } |
1642 | |
1643 | #endif /* NTFS_RW */ |
1644 | |
1645 | /** |
1646 | * load_and_init_upcase - load the upcase table for an ntfs volume |
1647 | * @vol: ntfs super block describing device whose upcase to load |
1648 | * |
1649 | * Return 'true' on success or 'false' on error. |
1650 | */ |
1651 | static bool load_and_init_upcase(ntfs_volume *vol) |
1652 | { |
1653 | loff_t i_size; |
1654 | struct super_block *sb = vol->sb; |
1655 | struct inode *ino; |
1656 | struct page *page; |
1657 | pgoff_t index, max_index; |
1658 | unsigned int size; |
1659 | int i, max; |
1660 | |
1661 | ntfs_debug("Entering." ); |
1662 | /* Read upcase table and setup vol->upcase and vol->upcase_len. */ |
1663 | ino = ntfs_iget(sb, mft_no: FILE_UpCase); |
1664 | if (IS_ERR(ptr: ino) || is_bad_inode(ino)) { |
1665 | if (!IS_ERR(ptr: ino)) |
1666 | iput(ino); |
1667 | goto upcase_failed; |
1668 | } |
1669 | /* |
1670 | * The upcase size must not be above 64k Unicode characters, must not |
1671 | * be zero and must be a multiple of sizeof(ntfschar). |
1672 | */ |
1673 | i_size = i_size_read(inode: ino); |
1674 | if (!i_size || i_size & (sizeof(ntfschar) - 1) || |
1675 | i_size > 64ULL * 1024 * sizeof(ntfschar)) |
1676 | goto iput_upcase_failed; |
1677 | vol->upcase = (ntfschar*)ntfs_malloc_nofs(size: i_size); |
1678 | if (!vol->upcase) |
1679 | goto iput_upcase_failed; |
1680 | index = 0; |
1681 | max_index = i_size >> PAGE_SHIFT; |
1682 | size = PAGE_SIZE; |
1683 | while (index < max_index) { |
1684 | /* Read the upcase table and copy it into the linear buffer. */ |
1685 | read_partial_upcase_page: |
1686 | page = ntfs_map_page(mapping: ino->i_mapping, index); |
1687 | if (IS_ERR(ptr: page)) |
1688 | goto iput_upcase_failed; |
1689 | memcpy((char*)vol->upcase + (index++ << PAGE_SHIFT), |
1690 | page_address(page), size); |
1691 | ntfs_unmap_page(page); |
1692 | } |
1693 | if (size == PAGE_SIZE) { |
1694 | size = i_size & ~PAGE_MASK; |
1695 | if (size) |
1696 | goto read_partial_upcase_page; |
1697 | } |
1698 | vol->upcase_len = i_size >> UCHAR_T_SIZE_BITS; |
1699 | ntfs_debug("Read %llu bytes from $UpCase (expected %zu bytes)." , |
1700 | i_size, 64 * 1024 * sizeof(ntfschar)); |
1701 | iput(ino); |
1702 | mutex_lock(&ntfs_lock); |
1703 | if (!default_upcase) { |
1704 | ntfs_debug("Using volume specified $UpCase since default is " |
1705 | "not present." ); |
1706 | mutex_unlock(lock: &ntfs_lock); |
1707 | return true; |
1708 | } |
1709 | max = default_upcase_len; |
1710 | if (max > vol->upcase_len) |
1711 | max = vol->upcase_len; |
1712 | for (i = 0; i < max; i++) |
1713 | if (vol->upcase[i] != default_upcase[i]) |
1714 | break; |
1715 | if (i == max) { |
1716 | ntfs_free(addr: vol->upcase); |
1717 | vol->upcase = default_upcase; |
1718 | vol->upcase_len = max; |
1719 | ntfs_nr_upcase_users++; |
1720 | mutex_unlock(lock: &ntfs_lock); |
1721 | ntfs_debug("Volume specified $UpCase matches default. Using " |
1722 | "default." ); |
1723 | return true; |
1724 | } |
1725 | mutex_unlock(lock: &ntfs_lock); |
1726 | ntfs_debug("Using volume specified $UpCase since it does not match " |
1727 | "the default." ); |
1728 | return true; |
1729 | iput_upcase_failed: |
1730 | iput(ino); |
1731 | ntfs_free(addr: vol->upcase); |
1732 | vol->upcase = NULL; |
1733 | upcase_failed: |
1734 | mutex_lock(&ntfs_lock); |
1735 | if (default_upcase) { |
1736 | vol->upcase = default_upcase; |
1737 | vol->upcase_len = default_upcase_len; |
1738 | ntfs_nr_upcase_users++; |
1739 | mutex_unlock(lock: &ntfs_lock); |
1740 | ntfs_error(sb, "Failed to load $UpCase from the volume. Using " |
1741 | "default." ); |
1742 | return true; |
1743 | } |
1744 | mutex_unlock(lock: &ntfs_lock); |
1745 | ntfs_error(sb, "Failed to initialize upcase table." ); |
1746 | return false; |
1747 | } |
1748 | |
1749 | /* |
1750 | * The lcn and mft bitmap inodes are NTFS-internal inodes with |
1751 | * their own special locking rules: |
1752 | */ |
1753 | static struct lock_class_key |
1754 | lcnbmp_runlist_lock_key, lcnbmp_mrec_lock_key, |
1755 | mftbmp_runlist_lock_key, mftbmp_mrec_lock_key; |
1756 | |
1757 | /** |
1758 | * load_system_files - open the system files using normal functions |
1759 | * @vol: ntfs super block describing device whose system files to load |
1760 | * |
1761 | * Open the system files with normal access functions and complete setting up |
1762 | * the ntfs super block @vol. |
1763 | * |
1764 | * Return 'true' on success or 'false' on error. |
1765 | */ |
1766 | static bool load_system_files(ntfs_volume *vol) |
1767 | { |
1768 | struct super_block *sb = vol->sb; |
1769 | MFT_RECORD *m; |
1770 | VOLUME_INFORMATION *vi; |
1771 | ntfs_attr_search_ctx *ctx; |
1772 | #ifdef NTFS_RW |
1773 | RESTART_PAGE_HEADER *rp; |
1774 | int err; |
1775 | #endif /* NTFS_RW */ |
1776 | |
1777 | ntfs_debug("Entering." ); |
1778 | #ifdef NTFS_RW |
1779 | /* Get mft mirror inode compare the contents of $MFT and $MFTMirr. */ |
1780 | if (!load_and_init_mft_mirror(vol) || !check_mft_mirror(vol)) { |
1781 | static const char *es1 = "Failed to load $MFTMirr" ; |
1782 | static const char *es2 = "$MFTMirr does not match $MFT" ; |
1783 | static const char *es3 = ". Run ntfsfix and/or chkdsk." ; |
1784 | |
1785 | /* If a read-write mount, convert it to a read-only mount. */ |
1786 | if (!sb_rdonly(sb)) { |
1787 | if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | |
1788 | ON_ERRORS_CONTINUE))) { |
1789 | ntfs_error(sb, "%s and neither on_errors=" |
1790 | "continue nor on_errors=" |
1791 | "remount-ro was specified%s" , |
1792 | !vol->mftmirr_ino ? es1 : es2, |
1793 | es3); |
1794 | goto iput_mirr_err_out; |
1795 | } |
1796 | sb->s_flags |= SB_RDONLY; |
1797 | ntfs_error(sb, "%s. Mounting read-only%s" , |
1798 | !vol->mftmirr_ino ? es1 : es2, es3); |
1799 | } else |
1800 | ntfs_warning(sb, "%s. Will not be able to remount " |
1801 | "read-write%s" , |
1802 | !vol->mftmirr_ino ? es1 : es2, es3); |
1803 | /* This will prevent a read-write remount. */ |
1804 | NVolSetErrors(vol); |
1805 | } |
1806 | #endif /* NTFS_RW */ |
1807 | /* Get mft bitmap attribute inode. */ |
1808 | vol->mftbmp_ino = ntfs_attr_iget(base_vi: vol->mft_ino, type: AT_BITMAP, NULL, name_len: 0); |
1809 | if (IS_ERR(ptr: vol->mftbmp_ino)) { |
1810 | ntfs_error(sb, "Failed to load $MFT/$BITMAP attribute." ); |
1811 | goto iput_mirr_err_out; |
1812 | } |
1813 | lockdep_set_class(&NTFS_I(vol->mftbmp_ino)->runlist.lock, |
1814 | &mftbmp_runlist_lock_key); |
1815 | lockdep_set_class(&NTFS_I(vol->mftbmp_ino)->mrec_lock, |
1816 | &mftbmp_mrec_lock_key); |
1817 | /* Read upcase table and setup @vol->upcase and @vol->upcase_len. */ |
1818 | if (!load_and_init_upcase(vol)) |
1819 | goto iput_mftbmp_err_out; |
1820 | #ifdef NTFS_RW |
1821 | /* |
1822 | * Read attribute definitions table and setup @vol->attrdef and |
1823 | * @vol->attrdef_size. |
1824 | */ |
1825 | if (!load_and_init_attrdef(vol)) |
1826 | goto iput_upcase_err_out; |
1827 | #endif /* NTFS_RW */ |
1828 | /* |
1829 | * Get the cluster allocation bitmap inode and verify the size, no |
1830 | * need for any locking at this stage as we are already running |
1831 | * exclusively as we are mount in progress task. |
1832 | */ |
1833 | vol->lcnbmp_ino = ntfs_iget(sb, mft_no: FILE_Bitmap); |
1834 | if (IS_ERR(ptr: vol->lcnbmp_ino) || is_bad_inode(vol->lcnbmp_ino)) { |
1835 | if (!IS_ERR(ptr: vol->lcnbmp_ino)) |
1836 | iput(vol->lcnbmp_ino); |
1837 | goto bitmap_failed; |
1838 | } |
1839 | lockdep_set_class(&NTFS_I(vol->lcnbmp_ino)->runlist.lock, |
1840 | &lcnbmp_runlist_lock_key); |
1841 | lockdep_set_class(&NTFS_I(vol->lcnbmp_ino)->mrec_lock, |
1842 | &lcnbmp_mrec_lock_key); |
1843 | |
1844 | NInoSetSparseDisabled(ni: NTFS_I(inode: vol->lcnbmp_ino)); |
1845 | if ((vol->nr_clusters + 7) >> 3 > i_size_read(inode: vol->lcnbmp_ino)) { |
1846 | iput(vol->lcnbmp_ino); |
1847 | bitmap_failed: |
1848 | ntfs_error(sb, "Failed to load $Bitmap." ); |
1849 | goto iput_attrdef_err_out; |
1850 | } |
1851 | /* |
1852 | * Get the volume inode and setup our cache of the volume flags and |
1853 | * version. |
1854 | */ |
1855 | vol->vol_ino = ntfs_iget(sb, mft_no: FILE_Volume); |
1856 | if (IS_ERR(ptr: vol->vol_ino) || is_bad_inode(vol->vol_ino)) { |
1857 | if (!IS_ERR(ptr: vol->vol_ino)) |
1858 | iput(vol->vol_ino); |
1859 | volume_failed: |
1860 | ntfs_error(sb, "Failed to load $Volume." ); |
1861 | goto iput_lcnbmp_err_out; |
1862 | } |
1863 | m = map_mft_record(ni: NTFS_I(inode: vol->vol_ino)); |
1864 | if (IS_ERR(ptr: m)) { |
1865 | iput_volume_failed: |
1866 | iput(vol->vol_ino); |
1867 | goto volume_failed; |
1868 | } |
1869 | if (!(ctx = ntfs_attr_get_search_ctx(ni: NTFS_I(inode: vol->vol_ino), mrec: m))) { |
1870 | ntfs_error(sb, "Failed to get attribute search context." ); |
1871 | goto get_ctx_vol_failed; |
1872 | } |
1873 | if (ntfs_attr_lookup(type: AT_VOLUME_INFORMATION, NULL, name_len: 0, ic: 0, lowest_vcn: 0, NULL, val_len: 0, |
1874 | ctx) || ctx->attr->non_resident || ctx->attr->flags) { |
1875 | err_put_vol: |
1876 | ntfs_attr_put_search_ctx(ctx); |
1877 | get_ctx_vol_failed: |
1878 | unmap_mft_record(ni: NTFS_I(inode: vol->vol_ino)); |
1879 | goto iput_volume_failed; |
1880 | } |
1881 | vi = (VOLUME_INFORMATION*)((char*)ctx->attr + |
1882 | le16_to_cpu(ctx->attr->data.resident.value_offset)); |
1883 | /* Some bounds checks. */ |
1884 | if ((u8*)vi < (u8*)ctx->attr || (u8*)vi + |
1885 | le32_to_cpu(ctx->attr->data.resident.value_length) > |
1886 | (u8*)ctx->attr + le32_to_cpu(ctx->attr->length)) |
1887 | goto err_put_vol; |
1888 | /* Copy the volume flags and version to the ntfs_volume structure. */ |
1889 | vol->vol_flags = vi->flags; |
1890 | vol->major_ver = vi->major_ver; |
1891 | vol->minor_ver = vi->minor_ver; |
1892 | ntfs_attr_put_search_ctx(ctx); |
1893 | unmap_mft_record(ni: NTFS_I(inode: vol->vol_ino)); |
1894 | pr_info("volume version %i.%i.\n" , vol->major_ver, |
1895 | vol->minor_ver); |
1896 | if (vol->major_ver < 3 && NVolSparseEnabled(vol)) { |
1897 | ntfs_warning(vol->sb, "Disabling sparse support due to NTFS " |
1898 | "volume version %i.%i (need at least version " |
1899 | "3.0)." , vol->major_ver, vol->minor_ver); |
1900 | NVolClearSparseEnabled(vol); |
1901 | } |
1902 | #ifdef NTFS_RW |
1903 | /* Make sure that no unsupported volume flags are set. */ |
1904 | if (vol->vol_flags & VOLUME_MUST_MOUNT_RO_MASK) { |
1905 | static const char *es1a = "Volume is dirty" ; |
1906 | static const char *es1b = "Volume has been modified by chkdsk" ; |
1907 | static const char *es1c = "Volume has unsupported flags set" ; |
1908 | static const char *es2a = ". Run chkdsk and mount in Windows." ; |
1909 | static const char *es2b = ". Mount in Windows." ; |
1910 | const char *es1, *es2; |
1911 | |
1912 | es2 = es2a; |
1913 | if (vol->vol_flags & VOLUME_IS_DIRTY) |
1914 | es1 = es1a; |
1915 | else if (vol->vol_flags & VOLUME_MODIFIED_BY_CHKDSK) { |
1916 | es1 = es1b; |
1917 | es2 = es2b; |
1918 | } else { |
1919 | es1 = es1c; |
1920 | ntfs_warning(sb, "Unsupported volume flags 0x%x " |
1921 | "encountered." , |
1922 | (unsigned)le16_to_cpu(vol->vol_flags)); |
1923 | } |
1924 | /* If a read-write mount, convert it to a read-only mount. */ |
1925 | if (!sb_rdonly(sb)) { |
1926 | if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | |
1927 | ON_ERRORS_CONTINUE))) { |
1928 | ntfs_error(sb, "%s and neither on_errors=" |
1929 | "continue nor on_errors=" |
1930 | "remount-ro was specified%s" , |
1931 | es1, es2); |
1932 | goto iput_vol_err_out; |
1933 | } |
1934 | sb->s_flags |= SB_RDONLY; |
1935 | ntfs_error(sb, "%s. Mounting read-only%s" , es1, es2); |
1936 | } else |
1937 | ntfs_warning(sb, "%s. Will not be able to remount " |
1938 | "read-write%s" , es1, es2); |
1939 | /* |
1940 | * Do not set NVolErrors() because ntfs_remount() re-checks the |
1941 | * flags which we need to do in case any flags have changed. |
1942 | */ |
1943 | } |
1944 | /* |
1945 | * Get the inode for the logfile, check it and determine if the volume |
1946 | * was shutdown cleanly. |
1947 | */ |
1948 | rp = NULL; |
1949 | if (!load_and_check_logfile(vol, rp: &rp) || |
1950 | !ntfs_is_logfile_clean(log_vi: vol->logfile_ino, rp)) { |
1951 | static const char *es1a = "Failed to load $LogFile" ; |
1952 | static const char *es1b = "$LogFile is not clean" ; |
1953 | static const char *es2 = ". Mount in Windows." ; |
1954 | const char *es1; |
1955 | |
1956 | es1 = !vol->logfile_ino ? es1a : es1b; |
1957 | /* If a read-write mount, convert it to a read-only mount. */ |
1958 | if (!sb_rdonly(sb)) { |
1959 | if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | |
1960 | ON_ERRORS_CONTINUE))) { |
1961 | ntfs_error(sb, "%s and neither on_errors=" |
1962 | "continue nor on_errors=" |
1963 | "remount-ro was specified%s" , |
1964 | es1, es2); |
1965 | if (vol->logfile_ino) { |
1966 | BUG_ON(!rp); |
1967 | ntfs_free(addr: rp); |
1968 | } |
1969 | goto iput_logfile_err_out; |
1970 | } |
1971 | sb->s_flags |= SB_RDONLY; |
1972 | ntfs_error(sb, "%s. Mounting read-only%s" , es1, es2); |
1973 | } else |
1974 | ntfs_warning(sb, "%s. Will not be able to remount " |
1975 | "read-write%s" , es1, es2); |
1976 | /* This will prevent a read-write remount. */ |
1977 | NVolSetErrors(vol); |
1978 | } |
1979 | ntfs_free(addr: rp); |
1980 | #endif /* NTFS_RW */ |
1981 | /* Get the root directory inode so we can do path lookups. */ |
1982 | vol->root_ino = ntfs_iget(sb, mft_no: FILE_root); |
1983 | if (IS_ERR(ptr: vol->root_ino) || is_bad_inode(vol->root_ino)) { |
1984 | if (!IS_ERR(ptr: vol->root_ino)) |
1985 | iput(vol->root_ino); |
1986 | ntfs_error(sb, "Failed to load root directory." ); |
1987 | goto iput_logfile_err_out; |
1988 | } |
1989 | #ifdef NTFS_RW |
1990 | /* |
1991 | * Check if Windows is suspended to disk on the target volume. If it |
1992 | * is hibernated, we must not write *anything* to the disk so set |
1993 | * NVolErrors() without setting the dirty volume flag and mount |
1994 | * read-only. This will prevent read-write remounting and it will also |
1995 | * prevent all writes. |
1996 | */ |
1997 | err = check_windows_hibernation_status(vol); |
1998 | if (unlikely(err)) { |
1999 | static const char *es1a = "Failed to determine if Windows is " |
2000 | "hibernated" ; |
2001 | static const char *es1b = "Windows is hibernated" ; |
2002 | static const char *es2 = ". Run chkdsk." ; |
2003 | const char *es1; |
2004 | |
2005 | es1 = err < 0 ? es1a : es1b; |
2006 | /* If a read-write mount, convert it to a read-only mount. */ |
2007 | if (!sb_rdonly(sb)) { |
2008 | if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | |
2009 | ON_ERRORS_CONTINUE))) { |
2010 | ntfs_error(sb, "%s and neither on_errors=" |
2011 | "continue nor on_errors=" |
2012 | "remount-ro was specified%s" , |
2013 | es1, es2); |
2014 | goto iput_root_err_out; |
2015 | } |
2016 | sb->s_flags |= SB_RDONLY; |
2017 | ntfs_error(sb, "%s. Mounting read-only%s" , es1, es2); |
2018 | } else |
2019 | ntfs_warning(sb, "%s. Will not be able to remount " |
2020 | "read-write%s" , es1, es2); |
2021 | /* This will prevent a read-write remount. */ |
2022 | NVolSetErrors(vol); |
2023 | } |
2024 | /* If (still) a read-write mount, mark the volume dirty. */ |
2025 | if (!sb_rdonly(sb) && ntfs_set_volume_flags(vol, flags: VOLUME_IS_DIRTY)) { |
2026 | static const char *es1 = "Failed to set dirty bit in volume " |
2027 | "information flags" ; |
2028 | static const char *es2 = ". Run chkdsk." ; |
2029 | |
2030 | /* Convert to a read-only mount. */ |
2031 | if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | |
2032 | ON_ERRORS_CONTINUE))) { |
2033 | ntfs_error(sb, "%s and neither on_errors=continue nor " |
2034 | "on_errors=remount-ro was specified%s" , |
2035 | es1, es2); |
2036 | goto iput_root_err_out; |
2037 | } |
2038 | ntfs_error(sb, "%s. Mounting read-only%s" , es1, es2); |
2039 | sb->s_flags |= SB_RDONLY; |
2040 | /* |
2041 | * Do not set NVolErrors() because ntfs_remount() might manage |
2042 | * to set the dirty flag in which case all would be well. |
2043 | */ |
2044 | } |
2045 | #if 0 |
2046 | // TODO: Enable this code once we start modifying anything that is |
2047 | // different between NTFS 1.2 and 3.x... |
2048 | /* |
2049 | * If (still) a read-write mount, set the NT4 compatibility flag on |
2050 | * newer NTFS version volumes. |
2051 | */ |
2052 | if (!(sb->s_flags & SB_RDONLY) && (vol->major_ver > 1) && |
2053 | ntfs_set_volume_flags(vol, VOLUME_MOUNTED_ON_NT4)) { |
2054 | static const char *es1 = "Failed to set NT4 compatibility flag" ; |
2055 | static const char *es2 = ". Run chkdsk." ; |
2056 | |
2057 | /* Convert to a read-only mount. */ |
2058 | if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | |
2059 | ON_ERRORS_CONTINUE))) { |
2060 | ntfs_error(sb, "%s and neither on_errors=continue nor " |
2061 | "on_errors=remount-ro was specified%s" , |
2062 | es1, es2); |
2063 | goto iput_root_err_out; |
2064 | } |
2065 | ntfs_error(sb, "%s. Mounting read-only%s" , es1, es2); |
2066 | sb->s_flags |= SB_RDONLY; |
2067 | NVolSetErrors(vol); |
2068 | } |
2069 | #endif |
2070 | /* If (still) a read-write mount, empty the logfile. */ |
2071 | if (!sb_rdonly(sb) && !ntfs_empty_logfile(log_vi: vol->logfile_ino)) { |
2072 | static const char *es1 = "Failed to empty $LogFile" ; |
2073 | static const char *es2 = ". Mount in Windows." ; |
2074 | |
2075 | /* Convert to a read-only mount. */ |
2076 | if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | |
2077 | ON_ERRORS_CONTINUE))) { |
2078 | ntfs_error(sb, "%s and neither on_errors=continue nor " |
2079 | "on_errors=remount-ro was specified%s" , |
2080 | es1, es2); |
2081 | goto iput_root_err_out; |
2082 | } |
2083 | ntfs_error(sb, "%s. Mounting read-only%s" , es1, es2); |
2084 | sb->s_flags |= SB_RDONLY; |
2085 | NVolSetErrors(vol); |
2086 | } |
2087 | #endif /* NTFS_RW */ |
2088 | /* If on NTFS versions before 3.0, we are done. */ |
2089 | if (unlikely(vol->major_ver < 3)) |
2090 | return true; |
2091 | /* NTFS 3.0+ specific initialization. */ |
2092 | /* Get the security descriptors inode. */ |
2093 | vol->secure_ino = ntfs_iget(sb, mft_no: FILE_Secure); |
2094 | if (IS_ERR(ptr: vol->secure_ino) || is_bad_inode(vol->secure_ino)) { |
2095 | if (!IS_ERR(ptr: vol->secure_ino)) |
2096 | iput(vol->secure_ino); |
2097 | ntfs_error(sb, "Failed to load $Secure." ); |
2098 | goto iput_root_err_out; |
2099 | } |
2100 | // TODO: Initialize security. |
2101 | /* Get the extended system files' directory inode. */ |
2102 | vol->extend_ino = ntfs_iget(sb, mft_no: FILE_Extend); |
2103 | if (IS_ERR(ptr: vol->extend_ino) || is_bad_inode(vol->extend_ino) || |
2104 | !S_ISDIR(vol->extend_ino->i_mode)) { |
2105 | if (!IS_ERR(ptr: vol->extend_ino)) |
2106 | iput(vol->extend_ino); |
2107 | ntfs_error(sb, "Failed to load $Extend." ); |
2108 | goto iput_sec_err_out; |
2109 | } |
2110 | #ifdef NTFS_RW |
2111 | /* Find the quota file, load it if present, and set it up. */ |
2112 | if (!load_and_init_quota(vol)) { |
2113 | static const char *es1 = "Failed to load $Quota" ; |
2114 | static const char *es2 = ". Run chkdsk." ; |
2115 | |
2116 | /* If a read-write mount, convert it to a read-only mount. */ |
2117 | if (!sb_rdonly(sb)) { |
2118 | if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | |
2119 | ON_ERRORS_CONTINUE))) { |
2120 | ntfs_error(sb, "%s and neither on_errors=" |
2121 | "continue nor on_errors=" |
2122 | "remount-ro was specified%s" , |
2123 | es1, es2); |
2124 | goto iput_quota_err_out; |
2125 | } |
2126 | sb->s_flags |= SB_RDONLY; |
2127 | ntfs_error(sb, "%s. Mounting read-only%s" , es1, es2); |
2128 | } else |
2129 | ntfs_warning(sb, "%s. Will not be able to remount " |
2130 | "read-write%s" , es1, es2); |
2131 | /* This will prevent a read-write remount. */ |
2132 | NVolSetErrors(vol); |
2133 | } |
2134 | /* If (still) a read-write mount, mark the quotas out of date. */ |
2135 | if (!sb_rdonly(sb) && !ntfs_mark_quotas_out_of_date(vol)) { |
2136 | static const char *es1 = "Failed to mark quotas out of date" ; |
2137 | static const char *es2 = ". Run chkdsk." ; |
2138 | |
2139 | /* Convert to a read-only mount. */ |
2140 | if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | |
2141 | ON_ERRORS_CONTINUE))) { |
2142 | ntfs_error(sb, "%s and neither on_errors=continue nor " |
2143 | "on_errors=remount-ro was specified%s" , |
2144 | es1, es2); |
2145 | goto iput_quota_err_out; |
2146 | } |
2147 | ntfs_error(sb, "%s. Mounting read-only%s" , es1, es2); |
2148 | sb->s_flags |= SB_RDONLY; |
2149 | NVolSetErrors(vol); |
2150 | } |
2151 | /* |
2152 | * Find the transaction log file ($UsnJrnl), load it if present, check |
2153 | * it, and set it up. |
2154 | */ |
2155 | if (!load_and_init_usnjrnl(vol)) { |
2156 | static const char *es1 = "Failed to load $UsnJrnl" ; |
2157 | static const char *es2 = ". Run chkdsk." ; |
2158 | |
2159 | /* If a read-write mount, convert it to a read-only mount. */ |
2160 | if (!sb_rdonly(sb)) { |
2161 | if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | |
2162 | ON_ERRORS_CONTINUE))) { |
2163 | ntfs_error(sb, "%s and neither on_errors=" |
2164 | "continue nor on_errors=" |
2165 | "remount-ro was specified%s" , |
2166 | es1, es2); |
2167 | goto iput_usnjrnl_err_out; |
2168 | } |
2169 | sb->s_flags |= SB_RDONLY; |
2170 | ntfs_error(sb, "%s. Mounting read-only%s" , es1, es2); |
2171 | } else |
2172 | ntfs_warning(sb, "%s. Will not be able to remount " |
2173 | "read-write%s" , es1, es2); |
2174 | /* This will prevent a read-write remount. */ |
2175 | NVolSetErrors(vol); |
2176 | } |
2177 | /* If (still) a read-write mount, stamp the transaction log. */ |
2178 | if (!sb_rdonly(sb) && !ntfs_stamp_usnjrnl(vol)) { |
2179 | static const char *es1 = "Failed to stamp transaction log " |
2180 | "($UsnJrnl)" ; |
2181 | static const char *es2 = ". Run chkdsk." ; |
2182 | |
2183 | /* Convert to a read-only mount. */ |
2184 | if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | |
2185 | ON_ERRORS_CONTINUE))) { |
2186 | ntfs_error(sb, "%s and neither on_errors=continue nor " |
2187 | "on_errors=remount-ro was specified%s" , |
2188 | es1, es2); |
2189 | goto iput_usnjrnl_err_out; |
2190 | } |
2191 | ntfs_error(sb, "%s. Mounting read-only%s" , es1, es2); |
2192 | sb->s_flags |= SB_RDONLY; |
2193 | NVolSetErrors(vol); |
2194 | } |
2195 | #endif /* NTFS_RW */ |
2196 | return true; |
2197 | #ifdef NTFS_RW |
2198 | iput_usnjrnl_err_out: |
2199 | iput(vol->usnjrnl_j_ino); |
2200 | iput(vol->usnjrnl_max_ino); |
2201 | iput(vol->usnjrnl_ino); |
2202 | iput_quota_err_out: |
2203 | iput(vol->quota_q_ino); |
2204 | iput(vol->quota_ino); |
2205 | iput(vol->extend_ino); |
2206 | #endif /* NTFS_RW */ |
2207 | iput_sec_err_out: |
2208 | iput(vol->secure_ino); |
2209 | iput_root_err_out: |
2210 | iput(vol->root_ino); |
2211 | iput_logfile_err_out: |
2212 | #ifdef NTFS_RW |
2213 | iput(vol->logfile_ino); |
2214 | iput_vol_err_out: |
2215 | #endif /* NTFS_RW */ |
2216 | iput(vol->vol_ino); |
2217 | iput_lcnbmp_err_out: |
2218 | iput(vol->lcnbmp_ino); |
2219 | iput_attrdef_err_out: |
2220 | vol->attrdef_size = 0; |
2221 | if (vol->attrdef) { |
2222 | ntfs_free(addr: vol->attrdef); |
2223 | vol->attrdef = NULL; |
2224 | } |
2225 | #ifdef NTFS_RW |
2226 | iput_upcase_err_out: |
2227 | #endif /* NTFS_RW */ |
2228 | vol->upcase_len = 0; |
2229 | mutex_lock(&ntfs_lock); |
2230 | if (vol->upcase == default_upcase) { |
2231 | ntfs_nr_upcase_users--; |
2232 | vol->upcase = NULL; |
2233 | } |
2234 | mutex_unlock(lock: &ntfs_lock); |
2235 | if (vol->upcase) { |
2236 | ntfs_free(addr: vol->upcase); |
2237 | vol->upcase = NULL; |
2238 | } |
2239 | iput_mftbmp_err_out: |
2240 | iput(vol->mftbmp_ino); |
2241 | iput_mirr_err_out: |
2242 | #ifdef NTFS_RW |
2243 | iput(vol->mftmirr_ino); |
2244 | #endif /* NTFS_RW */ |
2245 | return false; |
2246 | } |
2247 | |
2248 | /** |
2249 | * ntfs_put_super - called by the vfs to unmount a volume |
2250 | * @sb: vfs superblock of volume to unmount |
2251 | * |
2252 | * ntfs_put_super() is called by the VFS (from fs/super.c::do_umount()) when |
2253 | * the volume is being unmounted (umount system call has been invoked) and it |
2254 | * releases all inodes and memory belonging to the NTFS specific part of the |
2255 | * super block. |
2256 | */ |
2257 | static void ntfs_put_super(struct super_block *sb) |
2258 | { |
2259 | ntfs_volume *vol = NTFS_SB(sb); |
2260 | |
2261 | ntfs_debug("Entering." ); |
2262 | |
2263 | #ifdef NTFS_RW |
2264 | /* |
2265 | * Commit all inodes while they are still open in case some of them |
2266 | * cause others to be dirtied. |
2267 | */ |
2268 | ntfs_commit_inode(vi: vol->vol_ino); |
2269 | |
2270 | /* NTFS 3.0+ specific. */ |
2271 | if (vol->major_ver >= 3) { |
2272 | if (vol->usnjrnl_j_ino) |
2273 | ntfs_commit_inode(vi: vol->usnjrnl_j_ino); |
2274 | if (vol->usnjrnl_max_ino) |
2275 | ntfs_commit_inode(vi: vol->usnjrnl_max_ino); |
2276 | if (vol->usnjrnl_ino) |
2277 | ntfs_commit_inode(vi: vol->usnjrnl_ino); |
2278 | if (vol->quota_q_ino) |
2279 | ntfs_commit_inode(vi: vol->quota_q_ino); |
2280 | if (vol->quota_ino) |
2281 | ntfs_commit_inode(vi: vol->quota_ino); |
2282 | if (vol->extend_ino) |
2283 | ntfs_commit_inode(vi: vol->extend_ino); |
2284 | if (vol->secure_ino) |
2285 | ntfs_commit_inode(vi: vol->secure_ino); |
2286 | } |
2287 | |
2288 | ntfs_commit_inode(vi: vol->root_ino); |
2289 | |
2290 | down_write(sem: &vol->lcnbmp_lock); |
2291 | ntfs_commit_inode(vi: vol->lcnbmp_ino); |
2292 | up_write(sem: &vol->lcnbmp_lock); |
2293 | |
2294 | down_write(sem: &vol->mftbmp_lock); |
2295 | ntfs_commit_inode(vi: vol->mftbmp_ino); |
2296 | up_write(sem: &vol->mftbmp_lock); |
2297 | |
2298 | if (vol->logfile_ino) |
2299 | ntfs_commit_inode(vi: vol->logfile_ino); |
2300 | |
2301 | if (vol->mftmirr_ino) |
2302 | ntfs_commit_inode(vi: vol->mftmirr_ino); |
2303 | ntfs_commit_inode(vi: vol->mft_ino); |
2304 | |
2305 | /* |
2306 | * If a read-write mount and no volume errors have occurred, mark the |
2307 | * volume clean. Also, re-commit all affected inodes. |
2308 | */ |
2309 | if (!sb_rdonly(sb)) { |
2310 | if (!NVolErrors(vol)) { |
2311 | if (ntfs_clear_volume_flags(vol, flags: VOLUME_IS_DIRTY)) |
2312 | ntfs_warning(sb, "Failed to clear dirty bit " |
2313 | "in volume information " |
2314 | "flags. Run chkdsk." ); |
2315 | ntfs_commit_inode(vi: vol->vol_ino); |
2316 | ntfs_commit_inode(vi: vol->root_ino); |
2317 | if (vol->mftmirr_ino) |
2318 | ntfs_commit_inode(vi: vol->mftmirr_ino); |
2319 | ntfs_commit_inode(vi: vol->mft_ino); |
2320 | } else { |
2321 | ntfs_warning(sb, "Volume has errors. Leaving volume " |
2322 | "marked dirty. Run chkdsk." ); |
2323 | } |
2324 | } |
2325 | #endif /* NTFS_RW */ |
2326 | |
2327 | iput(vol->vol_ino); |
2328 | vol->vol_ino = NULL; |
2329 | |
2330 | /* NTFS 3.0+ specific clean up. */ |
2331 | if (vol->major_ver >= 3) { |
2332 | #ifdef NTFS_RW |
2333 | if (vol->usnjrnl_j_ino) { |
2334 | iput(vol->usnjrnl_j_ino); |
2335 | vol->usnjrnl_j_ino = NULL; |
2336 | } |
2337 | if (vol->usnjrnl_max_ino) { |
2338 | iput(vol->usnjrnl_max_ino); |
2339 | vol->usnjrnl_max_ino = NULL; |
2340 | } |
2341 | if (vol->usnjrnl_ino) { |
2342 | iput(vol->usnjrnl_ino); |
2343 | vol->usnjrnl_ino = NULL; |
2344 | } |
2345 | if (vol->quota_q_ino) { |
2346 | iput(vol->quota_q_ino); |
2347 | vol->quota_q_ino = NULL; |
2348 | } |
2349 | if (vol->quota_ino) { |
2350 | iput(vol->quota_ino); |
2351 | vol->quota_ino = NULL; |
2352 | } |
2353 | #endif /* NTFS_RW */ |
2354 | if (vol->extend_ino) { |
2355 | iput(vol->extend_ino); |
2356 | vol->extend_ino = NULL; |
2357 | } |
2358 | if (vol->secure_ino) { |
2359 | iput(vol->secure_ino); |
2360 | vol->secure_ino = NULL; |
2361 | } |
2362 | } |
2363 | |
2364 | iput(vol->root_ino); |
2365 | vol->root_ino = NULL; |
2366 | |
2367 | down_write(sem: &vol->lcnbmp_lock); |
2368 | iput(vol->lcnbmp_ino); |
2369 | vol->lcnbmp_ino = NULL; |
2370 | up_write(sem: &vol->lcnbmp_lock); |
2371 | |
2372 | down_write(sem: &vol->mftbmp_lock); |
2373 | iput(vol->mftbmp_ino); |
2374 | vol->mftbmp_ino = NULL; |
2375 | up_write(sem: &vol->mftbmp_lock); |
2376 | |
2377 | #ifdef NTFS_RW |
2378 | if (vol->logfile_ino) { |
2379 | iput(vol->logfile_ino); |
2380 | vol->logfile_ino = NULL; |
2381 | } |
2382 | if (vol->mftmirr_ino) { |
2383 | /* Re-commit the mft mirror and mft just in case. */ |
2384 | ntfs_commit_inode(vi: vol->mftmirr_ino); |
2385 | ntfs_commit_inode(vi: vol->mft_ino); |
2386 | iput(vol->mftmirr_ino); |
2387 | vol->mftmirr_ino = NULL; |
2388 | } |
2389 | /* |
2390 | * We should have no dirty inodes left, due to |
2391 | * mft.c::ntfs_mft_writepage() cleaning all the dirty pages as |
2392 | * the underlying mft records are written out and cleaned. |
2393 | */ |
2394 | ntfs_commit_inode(vi: vol->mft_ino); |
2395 | write_inode_now(vol->mft_ino, sync: 1); |
2396 | #endif /* NTFS_RW */ |
2397 | |
2398 | iput(vol->mft_ino); |
2399 | vol->mft_ino = NULL; |
2400 | |
2401 | /* Throw away the table of attribute definitions. */ |
2402 | vol->attrdef_size = 0; |
2403 | if (vol->attrdef) { |
2404 | ntfs_free(addr: vol->attrdef); |
2405 | vol->attrdef = NULL; |
2406 | } |
2407 | vol->upcase_len = 0; |
2408 | /* |
2409 | * Destroy the global default upcase table if necessary. Also decrease |
2410 | * the number of upcase users if we are a user. |
2411 | */ |
2412 | mutex_lock(&ntfs_lock); |
2413 | if (vol->upcase == default_upcase) { |
2414 | ntfs_nr_upcase_users--; |
2415 | vol->upcase = NULL; |
2416 | } |
2417 | if (!ntfs_nr_upcase_users && default_upcase) { |
2418 | ntfs_free(addr: default_upcase); |
2419 | default_upcase = NULL; |
2420 | } |
2421 | if (vol->cluster_size <= 4096 && !--ntfs_nr_compression_users) |
2422 | free_compression_buffers(); |
2423 | mutex_unlock(lock: &ntfs_lock); |
2424 | if (vol->upcase) { |
2425 | ntfs_free(addr: vol->upcase); |
2426 | vol->upcase = NULL; |
2427 | } |
2428 | |
2429 | unload_nls(vol->nls_map); |
2430 | |
2431 | sb->s_fs_info = NULL; |
2432 | kfree(objp: vol); |
2433 | } |
2434 | |
2435 | /** |
2436 | * get_nr_free_clusters - return the number of free clusters on a volume |
2437 | * @vol: ntfs volume for which to obtain free cluster count |
2438 | * |
2439 | * Calculate the number of free clusters on the mounted NTFS volume @vol. We |
2440 | * actually calculate the number of clusters in use instead because this |
2441 | * allows us to not care about partial pages as these will be just zero filled |
2442 | * and hence not be counted as allocated clusters. |
2443 | * |
2444 | * The only particularity is that clusters beyond the end of the logical ntfs |
2445 | * volume will be marked as allocated to prevent errors which means we have to |
2446 | * discount those at the end. This is important as the cluster bitmap always |
2447 | * has a size in multiples of 8 bytes, i.e. up to 63 clusters could be outside |
2448 | * the logical volume and marked in use when they are not as they do not exist. |
2449 | * |
2450 | * If any pages cannot be read we assume all clusters in the erroring pages are |
2451 | * in use. This means we return an underestimate on errors which is better than |
2452 | * an overestimate. |
2453 | */ |
2454 | static s64 get_nr_free_clusters(ntfs_volume *vol) |
2455 | { |
2456 | s64 nr_free = vol->nr_clusters; |
2457 | struct address_space *mapping = vol->lcnbmp_ino->i_mapping; |
2458 | struct page *page; |
2459 | pgoff_t index, max_index; |
2460 | |
2461 | ntfs_debug("Entering." ); |
2462 | /* Serialize accesses to the cluster bitmap. */ |
2463 | down_read(sem: &vol->lcnbmp_lock); |
2464 | /* |
2465 | * Convert the number of bits into bytes rounded up, then convert into |
2466 | * multiples of PAGE_SIZE, rounding up so that if we have one |
2467 | * full and one partial page max_index = 2. |
2468 | */ |
2469 | max_index = (((vol->nr_clusters + 7) >> 3) + PAGE_SIZE - 1) >> |
2470 | PAGE_SHIFT; |
2471 | /* Use multiples of 4 bytes, thus max_size is PAGE_SIZE / 4. */ |
2472 | ntfs_debug("Reading $Bitmap, max_index = 0x%lx, max_size = 0x%lx." , |
2473 | max_index, PAGE_SIZE / 4); |
2474 | for (index = 0; index < max_index; index++) { |
2475 | unsigned long *kaddr; |
2476 | |
2477 | /* |
2478 | * Read the page from page cache, getting it from backing store |
2479 | * if necessary, and increment the use count. |
2480 | */ |
2481 | page = read_mapping_page(mapping, index, NULL); |
2482 | /* Ignore pages which errored synchronously. */ |
2483 | if (IS_ERR(ptr: page)) { |
2484 | ntfs_debug("read_mapping_page() error. Skipping " |
2485 | "page (index 0x%lx)." , index); |
2486 | nr_free -= PAGE_SIZE * 8; |
2487 | continue; |
2488 | } |
2489 | kaddr = kmap_atomic(page); |
2490 | /* |
2491 | * Subtract the number of set bits. If this |
2492 | * is the last page and it is partial we don't really care as |
2493 | * it just means we do a little extra work but it won't affect |
2494 | * the result as all out of range bytes are set to zero by |
2495 | * ntfs_readpage(). |
2496 | */ |
2497 | nr_free -= bitmap_weight(src: kaddr, |
2498 | PAGE_SIZE * BITS_PER_BYTE); |
2499 | kunmap_atomic(kaddr); |
2500 | put_page(page); |
2501 | } |
2502 | ntfs_debug("Finished reading $Bitmap, last index = 0x%lx." , index - 1); |
2503 | /* |
2504 | * Fixup for eventual bits outside logical ntfs volume (see function |
2505 | * description above). |
2506 | */ |
2507 | if (vol->nr_clusters & 63) |
2508 | nr_free += 64 - (vol->nr_clusters & 63); |
2509 | up_read(sem: &vol->lcnbmp_lock); |
2510 | /* If errors occurred we may well have gone below zero, fix this. */ |
2511 | if (nr_free < 0) |
2512 | nr_free = 0; |
2513 | ntfs_debug("Exiting." ); |
2514 | return nr_free; |
2515 | } |
2516 | |
2517 | /** |
2518 | * __get_nr_free_mft_records - return the number of free inodes on a volume |
2519 | * @vol: ntfs volume for which to obtain free inode count |
2520 | * @nr_free: number of mft records in filesystem |
2521 | * @max_index: maximum number of pages containing set bits |
2522 | * |
2523 | * Calculate the number of free mft records (inodes) on the mounted NTFS |
2524 | * volume @vol. We actually calculate the number of mft records in use instead |
2525 | * because this allows us to not care about partial pages as these will be just |
2526 | * zero filled and hence not be counted as allocated mft record. |
2527 | * |
2528 | * If any pages cannot be read we assume all mft records in the erroring pages |
2529 | * are in use. This means we return an underestimate on errors which is better |
2530 | * than an overestimate. |
2531 | * |
2532 | * NOTE: Caller must hold mftbmp_lock rw_semaphore for reading or writing. |
2533 | */ |
2534 | static unsigned long __get_nr_free_mft_records(ntfs_volume *vol, |
2535 | s64 nr_free, const pgoff_t max_index) |
2536 | { |
2537 | struct address_space *mapping = vol->mftbmp_ino->i_mapping; |
2538 | struct page *page; |
2539 | pgoff_t index; |
2540 | |
2541 | ntfs_debug("Entering." ); |
2542 | /* Use multiples of 4 bytes, thus max_size is PAGE_SIZE / 4. */ |
2543 | ntfs_debug("Reading $MFT/$BITMAP, max_index = 0x%lx, max_size = " |
2544 | "0x%lx." , max_index, PAGE_SIZE / 4); |
2545 | for (index = 0; index < max_index; index++) { |
2546 | unsigned long *kaddr; |
2547 | |
2548 | /* |
2549 | * Read the page from page cache, getting it from backing store |
2550 | * if necessary, and increment the use count. |
2551 | */ |
2552 | page = read_mapping_page(mapping, index, NULL); |
2553 | /* Ignore pages which errored synchronously. */ |
2554 | if (IS_ERR(ptr: page)) { |
2555 | ntfs_debug("read_mapping_page() error. Skipping " |
2556 | "page (index 0x%lx)." , index); |
2557 | nr_free -= PAGE_SIZE * 8; |
2558 | continue; |
2559 | } |
2560 | kaddr = kmap_atomic(page); |
2561 | /* |
2562 | * Subtract the number of set bits. If this |
2563 | * is the last page and it is partial we don't really care as |
2564 | * it just means we do a little extra work but it won't affect |
2565 | * the result as all out of range bytes are set to zero by |
2566 | * ntfs_readpage(). |
2567 | */ |
2568 | nr_free -= bitmap_weight(src: kaddr, |
2569 | PAGE_SIZE * BITS_PER_BYTE); |
2570 | kunmap_atomic(kaddr); |
2571 | put_page(page); |
2572 | } |
2573 | ntfs_debug("Finished reading $MFT/$BITMAP, last index = 0x%lx." , |
2574 | index - 1); |
2575 | /* If errors occurred we may well have gone below zero, fix this. */ |
2576 | if (nr_free < 0) |
2577 | nr_free = 0; |
2578 | ntfs_debug("Exiting." ); |
2579 | return nr_free; |
2580 | } |
2581 | |
2582 | /** |
2583 | * ntfs_statfs - return information about mounted NTFS volume |
2584 | * @dentry: dentry from mounted volume |
2585 | * @sfs: statfs structure in which to return the information |
2586 | * |
2587 | * Return information about the mounted NTFS volume @dentry in the statfs structure |
2588 | * pointed to by @sfs (this is initialized with zeros before ntfs_statfs is |
2589 | * called). We interpret the values to be correct of the moment in time at |
2590 | * which we are called. Most values are variable otherwise and this isn't just |
2591 | * the free values but the totals as well. For example we can increase the |
2592 | * total number of file nodes if we run out and we can keep doing this until |
2593 | * there is no more space on the volume left at all. |
2594 | * |
2595 | * Called from vfs_statfs which is used to handle the statfs, fstatfs, and |
2596 | * ustat system calls. |
2597 | * |
2598 | * Return 0 on success or -errno on error. |
2599 | */ |
2600 | static int ntfs_statfs(struct dentry *dentry, struct kstatfs *sfs) |
2601 | { |
2602 | struct super_block *sb = dentry->d_sb; |
2603 | s64 size; |
2604 | ntfs_volume *vol = NTFS_SB(sb); |
2605 | ntfs_inode *mft_ni = NTFS_I(inode: vol->mft_ino); |
2606 | pgoff_t max_index; |
2607 | unsigned long flags; |
2608 | |
2609 | ntfs_debug("Entering." ); |
2610 | /* Type of filesystem. */ |
2611 | sfs->f_type = NTFS_SB_MAGIC; |
2612 | /* Optimal transfer block size. */ |
2613 | sfs->f_bsize = PAGE_SIZE; |
2614 | /* |
2615 | * Total data blocks in filesystem in units of f_bsize and since |
2616 | * inodes are also stored in data blocs ($MFT is a file) this is just |
2617 | * the total clusters. |
2618 | */ |
2619 | sfs->f_blocks = vol->nr_clusters << vol->cluster_size_bits >> |
2620 | PAGE_SHIFT; |
2621 | /* Free data blocks in filesystem in units of f_bsize. */ |
2622 | size = get_nr_free_clusters(vol) << vol->cluster_size_bits >> |
2623 | PAGE_SHIFT; |
2624 | if (size < 0LL) |
2625 | size = 0LL; |
2626 | /* Free blocks avail to non-superuser, same as above on NTFS. */ |
2627 | sfs->f_bavail = sfs->f_bfree = size; |
2628 | /* Serialize accesses to the inode bitmap. */ |
2629 | down_read(sem: &vol->mftbmp_lock); |
2630 | read_lock_irqsave(&mft_ni->size_lock, flags); |
2631 | size = i_size_read(inode: vol->mft_ino) >> vol->mft_record_size_bits; |
2632 | /* |
2633 | * Convert the maximum number of set bits into bytes rounded up, then |
2634 | * convert into multiples of PAGE_SIZE, rounding up so that if we |
2635 | * have one full and one partial page max_index = 2. |
2636 | */ |
2637 | max_index = ((((mft_ni->initialized_size >> vol->mft_record_size_bits) |
2638 | + 7) >> 3) + PAGE_SIZE - 1) >> PAGE_SHIFT; |
2639 | read_unlock_irqrestore(&mft_ni->size_lock, flags); |
2640 | /* Number of inodes in filesystem (at this point in time). */ |
2641 | sfs->f_files = size; |
2642 | /* Free inodes in fs (based on current total count). */ |
2643 | sfs->f_ffree = __get_nr_free_mft_records(vol, nr_free: size, max_index); |
2644 | up_read(sem: &vol->mftbmp_lock); |
2645 | /* |
2646 | * File system id. This is extremely *nix flavour dependent and even |
2647 | * within Linux itself all fs do their own thing. I interpret this to |
2648 | * mean a unique id associated with the mounted fs and not the id |
2649 | * associated with the filesystem driver, the latter is already given |
2650 | * by the filesystem type in sfs->f_type. Thus we use the 64-bit |
2651 | * volume serial number splitting it into two 32-bit parts. We enter |
2652 | * the least significant 32-bits in f_fsid[0] and the most significant |
2653 | * 32-bits in f_fsid[1]. |
2654 | */ |
2655 | sfs->f_fsid = u64_to_fsid(v: vol->serial_no); |
2656 | /* Maximum length of filenames. */ |
2657 | sfs->f_namelen = NTFS_MAX_NAME_LEN; |
2658 | return 0; |
2659 | } |
2660 | |
2661 | #ifdef NTFS_RW |
2662 | static int ntfs_write_inode(struct inode *vi, struct writeback_control *wbc) |
2663 | { |
2664 | return __ntfs_write_inode(vi, sync: wbc->sync_mode == WB_SYNC_ALL); |
2665 | } |
2666 | #endif |
2667 | |
2668 | /* |
2669 | * The complete super operations. |
2670 | */ |
2671 | static const struct super_operations ntfs_sops = { |
2672 | .alloc_inode = ntfs_alloc_big_inode, /* VFS: Allocate new inode. */ |
2673 | .free_inode = ntfs_free_big_inode, /* VFS: Deallocate inode. */ |
2674 | #ifdef NTFS_RW |
2675 | .write_inode = ntfs_write_inode, /* VFS: Write dirty inode to |
2676 | disk. */ |
2677 | #endif /* NTFS_RW */ |
2678 | .put_super = ntfs_put_super, /* Syscall: umount. */ |
2679 | .statfs = ntfs_statfs, /* Syscall: statfs */ |
2680 | .remount_fs = ntfs_remount, /* Syscall: mount -o remount. */ |
2681 | .evict_inode = ntfs_evict_big_inode, /* VFS: Called when an inode is |
2682 | removed from memory. */ |
2683 | .show_options = ntfs_show_options, /* Show mount options in |
2684 | proc. */ |
2685 | }; |
2686 | |
2687 | /** |
2688 | * ntfs_fill_super - mount an ntfs filesystem |
2689 | * @sb: super block of ntfs filesystem to mount |
2690 | * @opt: string containing the mount options |
2691 | * @silent: silence error output |
2692 | * |
2693 | * ntfs_fill_super() is called by the VFS to mount the device described by @sb |
2694 | * with the mount otions in @data with the NTFS filesystem. |
2695 | * |
2696 | * If @silent is true, remain silent even if errors are detected. This is used |
2697 | * during bootup, when the kernel tries to mount the root filesystem with all |
2698 | * registered filesystems one after the other until one succeeds. This implies |
2699 | * that all filesystems except the correct one will quite correctly and |
2700 | * expectedly return an error, but nobody wants to see error messages when in |
2701 | * fact this is what is supposed to happen. |
2702 | * |
2703 | * NOTE: @sb->s_flags contains the mount options flags. |
2704 | */ |
2705 | static int ntfs_fill_super(struct super_block *sb, void *opt, const int silent) |
2706 | { |
2707 | ntfs_volume *vol; |
2708 | struct buffer_head *bh; |
2709 | struct inode *tmp_ino; |
2710 | int blocksize, result; |
2711 | |
2712 | /* |
2713 | * We do a pretty difficult piece of bootstrap by reading the |
2714 | * MFT (and other metadata) from disk into memory. We'll only |
2715 | * release this metadata during umount, so the locking patterns |
2716 | * observed during bootstrap do not count. So turn off the |
2717 | * observation of locking patterns (strictly for this context |
2718 | * only) while mounting NTFS. [The validator is still active |
2719 | * otherwise, even for this context: it will for example record |
2720 | * lock class registrations.] |
2721 | */ |
2722 | lockdep_off(); |
2723 | ntfs_debug("Entering." ); |
2724 | #ifndef NTFS_RW |
2725 | sb->s_flags |= SB_RDONLY; |
2726 | #endif /* ! NTFS_RW */ |
2727 | /* Allocate a new ntfs_volume and place it in sb->s_fs_info. */ |
2728 | sb->s_fs_info = kmalloc(size: sizeof(ntfs_volume), GFP_NOFS); |
2729 | vol = NTFS_SB(sb); |
2730 | if (!vol) { |
2731 | if (!silent) |
2732 | ntfs_error(sb, "Allocation of NTFS volume structure " |
2733 | "failed. Aborting mount..." ); |
2734 | lockdep_on(); |
2735 | return -ENOMEM; |
2736 | } |
2737 | /* Initialize ntfs_volume structure. */ |
2738 | *vol = (ntfs_volume) { |
2739 | .sb = sb, |
2740 | /* |
2741 | * Default is group and other don't have any access to files or |
2742 | * directories while owner has full access. Further, files by |
2743 | * default are not executable but directories are of course |
2744 | * browseable. |
2745 | */ |
2746 | .fmask = 0177, |
2747 | .dmask = 0077, |
2748 | }; |
2749 | init_rwsem(&vol->mftbmp_lock); |
2750 | init_rwsem(&vol->lcnbmp_lock); |
2751 | |
2752 | /* By default, enable sparse support. */ |
2753 | NVolSetSparseEnabled(vol); |
2754 | |
2755 | /* Important to get the mount options dealt with now. */ |
2756 | if (!parse_options(vol, opt: (char*)opt)) |
2757 | goto err_out_now; |
2758 | |
2759 | /* We support sector sizes up to the PAGE_SIZE. */ |
2760 | if (bdev_logical_block_size(bdev: sb->s_bdev) > PAGE_SIZE) { |
2761 | if (!silent) |
2762 | ntfs_error(sb, "Device has unsupported sector size " |
2763 | "(%i). The maximum supported sector " |
2764 | "size on this architecture is %lu " |
2765 | "bytes." , |
2766 | bdev_logical_block_size(sb->s_bdev), |
2767 | PAGE_SIZE); |
2768 | goto err_out_now; |
2769 | } |
2770 | /* |
2771 | * Setup the device access block size to NTFS_BLOCK_SIZE or the hard |
2772 | * sector size, whichever is bigger. |
2773 | */ |
2774 | blocksize = sb_min_blocksize(sb, NTFS_BLOCK_SIZE); |
2775 | if (blocksize < NTFS_BLOCK_SIZE) { |
2776 | if (!silent) |
2777 | ntfs_error(sb, "Unable to set device block size." ); |
2778 | goto err_out_now; |
2779 | } |
2780 | BUG_ON(blocksize != sb->s_blocksize); |
2781 | ntfs_debug("Set device block size to %i bytes (block size bits %i)." , |
2782 | blocksize, sb->s_blocksize_bits); |
2783 | /* Determine the size of the device in units of block_size bytes. */ |
2784 | vol->nr_blocks = sb_bdev_nr_blocks(sb); |
2785 | if (!vol->nr_blocks) { |
2786 | if (!silent) |
2787 | ntfs_error(sb, "Unable to determine device size." ); |
2788 | goto err_out_now; |
2789 | } |
2790 | /* Read the boot sector and return unlocked buffer head to it. */ |
2791 | if (!(bh = read_ntfs_boot_sector(sb, silent))) { |
2792 | if (!silent) |
2793 | ntfs_error(sb, "Not an NTFS volume." ); |
2794 | goto err_out_now; |
2795 | } |
2796 | /* |
2797 | * Extract the data from the boot sector and setup the ntfs volume |
2798 | * using it. |
2799 | */ |
2800 | result = parse_ntfs_boot_sector(vol, b: (NTFS_BOOT_SECTOR*)bh->b_data); |
2801 | brelse(bh); |
2802 | if (!result) { |
2803 | if (!silent) |
2804 | ntfs_error(sb, "Unsupported NTFS filesystem." ); |
2805 | goto err_out_now; |
2806 | } |
2807 | /* |
2808 | * If the boot sector indicates a sector size bigger than the current |
2809 | * device block size, switch the device block size to the sector size. |
2810 | * TODO: It may be possible to support this case even when the set |
2811 | * below fails, we would just be breaking up the i/o for each sector |
2812 | * into multiple blocks for i/o purposes but otherwise it should just |
2813 | * work. However it is safer to leave disabled until someone hits this |
2814 | * error message and then we can get them to try it without the setting |
2815 | * so we know for sure that it works. |
2816 | */ |
2817 | if (vol->sector_size > blocksize) { |
2818 | blocksize = sb_set_blocksize(sb, vol->sector_size); |
2819 | if (blocksize != vol->sector_size) { |
2820 | if (!silent) |
2821 | ntfs_error(sb, "Unable to set device block " |
2822 | "size to sector size (%i)." , |
2823 | vol->sector_size); |
2824 | goto err_out_now; |
2825 | } |
2826 | BUG_ON(blocksize != sb->s_blocksize); |
2827 | vol->nr_blocks = sb_bdev_nr_blocks(sb); |
2828 | ntfs_debug("Changed device block size to %i bytes (block size " |
2829 | "bits %i) to match volume sector size." , |
2830 | blocksize, sb->s_blocksize_bits); |
2831 | } |
2832 | /* Initialize the cluster and mft allocators. */ |
2833 | ntfs_setup_allocators(vol); |
2834 | /* Setup remaining fields in the super block. */ |
2835 | sb->s_magic = NTFS_SB_MAGIC; |
2836 | /* |
2837 | * Ntfs allows 63 bits for the file size, i.e. correct would be: |
2838 | * sb->s_maxbytes = ~0ULL >> 1; |
2839 | * But the kernel uses a long as the page cache page index which on |
2840 | * 32-bit architectures is only 32-bits. MAX_LFS_FILESIZE is kernel |
2841 | * defined to the maximum the page cache page index can cope with |
2842 | * without overflowing the index or to 2^63 - 1, whichever is smaller. |
2843 | */ |
2844 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
2845 | /* Ntfs measures time in 100ns intervals. */ |
2846 | sb->s_time_gran = 100; |
2847 | /* |
2848 | * Now load the metadata required for the page cache and our address |
2849 | * space operations to function. We do this by setting up a specialised |
2850 | * read_inode method and then just calling the normal iget() to obtain |
2851 | * the inode for $MFT which is sufficient to allow our normal inode |
2852 | * operations and associated address space operations to function. |
2853 | */ |
2854 | sb->s_op = &ntfs_sops; |
2855 | tmp_ino = new_inode(sb); |
2856 | if (!tmp_ino) { |
2857 | if (!silent) |
2858 | ntfs_error(sb, "Failed to load essential metadata." ); |
2859 | goto err_out_now; |
2860 | } |
2861 | tmp_ino->i_ino = FILE_MFT; |
2862 | insert_inode_hash(inode: tmp_ino); |
2863 | if (ntfs_read_inode_mount(vi: tmp_ino) < 0) { |
2864 | if (!silent) |
2865 | ntfs_error(sb, "Failed to load essential metadata." ); |
2866 | goto iput_tmp_ino_err_out_now; |
2867 | } |
2868 | mutex_lock(&ntfs_lock); |
2869 | /* |
2870 | * The current mount is a compression user if the cluster size is |
2871 | * less than or equal 4kiB. |
2872 | */ |
2873 | if (vol->cluster_size <= 4096 && !ntfs_nr_compression_users++) { |
2874 | result = allocate_compression_buffers(); |
2875 | if (result) { |
2876 | ntfs_error(NULL, "Failed to allocate buffers " |
2877 | "for compression engine." ); |
2878 | ntfs_nr_compression_users--; |
2879 | mutex_unlock(lock: &ntfs_lock); |
2880 | goto iput_tmp_ino_err_out_now; |
2881 | } |
2882 | } |
2883 | /* |
2884 | * Generate the global default upcase table if necessary. Also |
2885 | * temporarily increment the number of upcase users to avoid race |
2886 | * conditions with concurrent (u)mounts. |
2887 | */ |
2888 | if (!default_upcase) |
2889 | default_upcase = generate_default_upcase(); |
2890 | ntfs_nr_upcase_users++; |
2891 | mutex_unlock(lock: &ntfs_lock); |
2892 | /* |
2893 | * From now on, ignore @silent parameter. If we fail below this line, |
2894 | * it will be due to a corrupt fs or a system error, so we report it. |
2895 | */ |
2896 | /* |
2897 | * Open the system files with normal access functions and complete |
2898 | * setting up the ntfs super block. |
2899 | */ |
2900 | if (!load_system_files(vol)) { |
2901 | ntfs_error(sb, "Failed to load system files." ); |
2902 | goto unl_upcase_iput_tmp_ino_err_out_now; |
2903 | } |
2904 | |
2905 | /* We grab a reference, simulating an ntfs_iget(). */ |
2906 | ihold(inode: vol->root_ino); |
2907 | if ((sb->s_root = d_make_root(vol->root_ino))) { |
2908 | ntfs_debug("Exiting, status successful." ); |
2909 | /* Release the default upcase if it has no users. */ |
2910 | mutex_lock(&ntfs_lock); |
2911 | if (!--ntfs_nr_upcase_users && default_upcase) { |
2912 | ntfs_free(addr: default_upcase); |
2913 | default_upcase = NULL; |
2914 | } |
2915 | mutex_unlock(lock: &ntfs_lock); |
2916 | sb->s_export_op = &ntfs_export_ops; |
2917 | lockdep_on(); |
2918 | return 0; |
2919 | } |
2920 | ntfs_error(sb, "Failed to allocate root directory." ); |
2921 | /* Clean up after the successful load_system_files() call from above. */ |
2922 | // TODO: Use ntfs_put_super() instead of repeating all this code... |
2923 | // FIXME: Should mark the volume clean as the error is most likely |
2924 | // -ENOMEM. |
2925 | iput(vol->vol_ino); |
2926 | vol->vol_ino = NULL; |
2927 | /* NTFS 3.0+ specific clean up. */ |
2928 | if (vol->major_ver >= 3) { |
2929 | #ifdef NTFS_RW |
2930 | if (vol->usnjrnl_j_ino) { |
2931 | iput(vol->usnjrnl_j_ino); |
2932 | vol->usnjrnl_j_ino = NULL; |
2933 | } |
2934 | if (vol->usnjrnl_max_ino) { |
2935 | iput(vol->usnjrnl_max_ino); |
2936 | vol->usnjrnl_max_ino = NULL; |
2937 | } |
2938 | if (vol->usnjrnl_ino) { |
2939 | iput(vol->usnjrnl_ino); |
2940 | vol->usnjrnl_ino = NULL; |
2941 | } |
2942 | if (vol->quota_q_ino) { |
2943 | iput(vol->quota_q_ino); |
2944 | vol->quota_q_ino = NULL; |
2945 | } |
2946 | if (vol->quota_ino) { |
2947 | iput(vol->quota_ino); |
2948 | vol->quota_ino = NULL; |
2949 | } |
2950 | #endif /* NTFS_RW */ |
2951 | if (vol->extend_ino) { |
2952 | iput(vol->extend_ino); |
2953 | vol->extend_ino = NULL; |
2954 | } |
2955 | if (vol->secure_ino) { |
2956 | iput(vol->secure_ino); |
2957 | vol->secure_ino = NULL; |
2958 | } |
2959 | } |
2960 | iput(vol->root_ino); |
2961 | vol->root_ino = NULL; |
2962 | iput(vol->lcnbmp_ino); |
2963 | vol->lcnbmp_ino = NULL; |
2964 | iput(vol->mftbmp_ino); |
2965 | vol->mftbmp_ino = NULL; |
2966 | #ifdef NTFS_RW |
2967 | if (vol->logfile_ino) { |
2968 | iput(vol->logfile_ino); |
2969 | vol->logfile_ino = NULL; |
2970 | } |
2971 | if (vol->mftmirr_ino) { |
2972 | iput(vol->mftmirr_ino); |
2973 | vol->mftmirr_ino = NULL; |
2974 | } |
2975 | #endif /* NTFS_RW */ |
2976 | /* Throw away the table of attribute definitions. */ |
2977 | vol->attrdef_size = 0; |
2978 | if (vol->attrdef) { |
2979 | ntfs_free(addr: vol->attrdef); |
2980 | vol->attrdef = NULL; |
2981 | } |
2982 | vol->upcase_len = 0; |
2983 | mutex_lock(&ntfs_lock); |
2984 | if (vol->upcase == default_upcase) { |
2985 | ntfs_nr_upcase_users--; |
2986 | vol->upcase = NULL; |
2987 | } |
2988 | mutex_unlock(lock: &ntfs_lock); |
2989 | if (vol->upcase) { |
2990 | ntfs_free(addr: vol->upcase); |
2991 | vol->upcase = NULL; |
2992 | } |
2993 | if (vol->nls_map) { |
2994 | unload_nls(vol->nls_map); |
2995 | vol->nls_map = NULL; |
2996 | } |
2997 | /* Error exit code path. */ |
2998 | unl_upcase_iput_tmp_ino_err_out_now: |
2999 | /* |
3000 | * Decrease the number of upcase users and destroy the global default |
3001 | * upcase table if necessary. |
3002 | */ |
3003 | mutex_lock(&ntfs_lock); |
3004 | if (!--ntfs_nr_upcase_users && default_upcase) { |
3005 | ntfs_free(addr: default_upcase); |
3006 | default_upcase = NULL; |
3007 | } |
3008 | if (vol->cluster_size <= 4096 && !--ntfs_nr_compression_users) |
3009 | free_compression_buffers(); |
3010 | mutex_unlock(lock: &ntfs_lock); |
3011 | iput_tmp_ino_err_out_now: |
3012 | iput(tmp_ino); |
3013 | if (vol->mft_ino && vol->mft_ino != tmp_ino) |
3014 | iput(vol->mft_ino); |
3015 | vol->mft_ino = NULL; |
3016 | /* Errors at this stage are irrelevant. */ |
3017 | err_out_now: |
3018 | sb->s_fs_info = NULL; |
3019 | kfree(objp: vol); |
3020 | ntfs_debug("Failed, returning -EINVAL." ); |
3021 | lockdep_on(); |
3022 | return -EINVAL; |
3023 | } |
3024 | |
3025 | /* |
3026 | * This is a slab cache to optimize allocations and deallocations of Unicode |
3027 | * strings of the maximum length allowed by NTFS, which is NTFS_MAX_NAME_LEN |
3028 | * (255) Unicode characters + a terminating NULL Unicode character. |
3029 | */ |
3030 | struct kmem_cache *ntfs_name_cache; |
3031 | |
3032 | /* Slab caches for efficient allocation/deallocation of inodes. */ |
3033 | struct kmem_cache *ntfs_inode_cache; |
3034 | struct kmem_cache *ntfs_big_inode_cache; |
3035 | |
3036 | /* Init once constructor for the inode slab cache. */ |
3037 | static void ntfs_big_inode_init_once(void *foo) |
3038 | { |
3039 | ntfs_inode *ni = (ntfs_inode *)foo; |
3040 | |
3041 | inode_init_once(VFS_I(ni)); |
3042 | } |
3043 | |
3044 | /* |
3045 | * Slab caches to optimize allocations and deallocations of attribute search |
3046 | * contexts and index contexts, respectively. |
3047 | */ |
3048 | struct kmem_cache *ntfs_attr_ctx_cache; |
3049 | struct kmem_cache *ntfs_index_ctx_cache; |
3050 | |
3051 | /* Driver wide mutex. */ |
3052 | DEFINE_MUTEX(ntfs_lock); |
3053 | |
3054 | static struct dentry *ntfs_mount(struct file_system_type *fs_type, |
3055 | int flags, const char *dev_name, void *data) |
3056 | { |
3057 | return mount_bdev(fs_type, flags, dev_name, data, fill_super: ntfs_fill_super); |
3058 | } |
3059 | |
3060 | static struct file_system_type ntfs_fs_type = { |
3061 | .owner = THIS_MODULE, |
3062 | .name = "ntfs" , |
3063 | .mount = ntfs_mount, |
3064 | .kill_sb = kill_block_super, |
3065 | .fs_flags = FS_REQUIRES_DEV, |
3066 | }; |
3067 | MODULE_ALIAS_FS("ntfs" ); |
3068 | |
3069 | /* Stable names for the slab caches. */ |
3070 | static const char ntfs_index_ctx_cache_name[] = "ntfs_index_ctx_cache" ; |
3071 | static const char ntfs_attr_ctx_cache_name[] = "ntfs_attr_ctx_cache" ; |
3072 | static const char ntfs_name_cache_name[] = "ntfs_name_cache" ; |
3073 | static const char ntfs_inode_cache_name[] = "ntfs_inode_cache" ; |
3074 | static const char ntfs_big_inode_cache_name[] = "ntfs_big_inode_cache" ; |
3075 | |
3076 | static int __init init_ntfs_fs(void) |
3077 | { |
3078 | int err = 0; |
3079 | |
3080 | /* This may be ugly but it results in pretty output so who cares. (-8 */ |
3081 | pr_info("driver " NTFS_VERSION " [Flags: R/" |
3082 | #ifdef NTFS_RW |
3083 | "W" |
3084 | #else |
3085 | "O" |
3086 | #endif |
3087 | #ifdef DEBUG |
3088 | " DEBUG" |
3089 | #endif |
3090 | #ifdef MODULE |
3091 | " MODULE" |
3092 | #endif |
3093 | "].\n" ); |
3094 | |
3095 | ntfs_debug("Debug messages are enabled." ); |
3096 | |
3097 | ntfs_index_ctx_cache = kmem_cache_create(name: ntfs_index_ctx_cache_name, |
3098 | size: sizeof(ntfs_index_context), align: 0 /* offset */, |
3099 | SLAB_HWCACHE_ALIGN, NULL /* ctor */); |
3100 | if (!ntfs_index_ctx_cache) { |
3101 | pr_crit("Failed to create %s!\n" , ntfs_index_ctx_cache_name); |
3102 | goto ictx_err_out; |
3103 | } |
3104 | ntfs_attr_ctx_cache = kmem_cache_create(name: ntfs_attr_ctx_cache_name, |
3105 | size: sizeof(ntfs_attr_search_ctx), align: 0 /* offset */, |
3106 | SLAB_HWCACHE_ALIGN, NULL /* ctor */); |
3107 | if (!ntfs_attr_ctx_cache) { |
3108 | pr_crit("NTFS: Failed to create %s!\n" , |
3109 | ntfs_attr_ctx_cache_name); |
3110 | goto actx_err_out; |
3111 | } |
3112 | |
3113 | ntfs_name_cache = kmem_cache_create(name: ntfs_name_cache_name, |
3114 | size: (NTFS_MAX_NAME_LEN+1) * sizeof(ntfschar), align: 0, |
3115 | SLAB_HWCACHE_ALIGN, NULL); |
3116 | if (!ntfs_name_cache) { |
3117 | pr_crit("Failed to create %s!\n" , ntfs_name_cache_name); |
3118 | goto name_err_out; |
3119 | } |
3120 | |
3121 | ntfs_inode_cache = kmem_cache_create(name: ntfs_inode_cache_name, |
3122 | size: sizeof(ntfs_inode), align: 0, |
3123 | SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, NULL); |
3124 | if (!ntfs_inode_cache) { |
3125 | pr_crit("Failed to create %s!\n" , ntfs_inode_cache_name); |
3126 | goto inode_err_out; |
3127 | } |
3128 | |
3129 | ntfs_big_inode_cache = kmem_cache_create(name: ntfs_big_inode_cache_name, |
3130 | size: sizeof(big_ntfs_inode), align: 0, |
3131 | SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| |
3132 | SLAB_ACCOUNT, ctor: ntfs_big_inode_init_once); |
3133 | if (!ntfs_big_inode_cache) { |
3134 | pr_crit("Failed to create %s!\n" , ntfs_big_inode_cache_name); |
3135 | goto big_inode_err_out; |
3136 | } |
3137 | |
3138 | /* Register the ntfs sysctls. */ |
3139 | err = ntfs_sysctl(add: 1); |
3140 | if (err) { |
3141 | pr_crit("Failed to register NTFS sysctls!\n" ); |
3142 | goto sysctl_err_out; |
3143 | } |
3144 | |
3145 | err = register_filesystem(&ntfs_fs_type); |
3146 | if (!err) { |
3147 | ntfs_debug("NTFS driver registered successfully." ); |
3148 | return 0; /* Success! */ |
3149 | } |
3150 | pr_crit("Failed to register NTFS filesystem driver!\n" ); |
3151 | |
3152 | /* Unregister the ntfs sysctls. */ |
3153 | ntfs_sysctl(add: 0); |
3154 | sysctl_err_out: |
3155 | kmem_cache_destroy(s: ntfs_big_inode_cache); |
3156 | big_inode_err_out: |
3157 | kmem_cache_destroy(s: ntfs_inode_cache); |
3158 | inode_err_out: |
3159 | kmem_cache_destroy(s: ntfs_name_cache); |
3160 | name_err_out: |
3161 | kmem_cache_destroy(s: ntfs_attr_ctx_cache); |
3162 | actx_err_out: |
3163 | kmem_cache_destroy(s: ntfs_index_ctx_cache); |
3164 | ictx_err_out: |
3165 | if (!err) { |
3166 | pr_crit("Aborting NTFS filesystem driver registration...\n" ); |
3167 | err = -ENOMEM; |
3168 | } |
3169 | return err; |
3170 | } |
3171 | |
3172 | static void __exit exit_ntfs_fs(void) |
3173 | { |
3174 | ntfs_debug("Unregistering NTFS driver." ); |
3175 | |
3176 | unregister_filesystem(&ntfs_fs_type); |
3177 | |
3178 | /* |
3179 | * Make sure all delayed rcu free inodes are flushed before we |
3180 | * destroy cache. |
3181 | */ |
3182 | rcu_barrier(); |
3183 | kmem_cache_destroy(s: ntfs_big_inode_cache); |
3184 | kmem_cache_destroy(s: ntfs_inode_cache); |
3185 | kmem_cache_destroy(s: ntfs_name_cache); |
3186 | kmem_cache_destroy(s: ntfs_attr_ctx_cache); |
3187 | kmem_cache_destroy(s: ntfs_index_ctx_cache); |
3188 | /* Unregister the ntfs sysctls. */ |
3189 | ntfs_sysctl(add: 0); |
3190 | } |
3191 | |
3192 | MODULE_AUTHOR("Anton Altaparmakov <anton@tuxera.com>" ); |
3193 | MODULE_DESCRIPTION("NTFS 1.2/3.x driver - Copyright (c) 2001-2014 Anton Altaparmakov and Tuxera Inc." ); |
3194 | MODULE_VERSION(NTFS_VERSION); |
3195 | MODULE_LICENSE("GPL" ); |
3196 | #ifdef DEBUG |
3197 | module_param(debug_msgs, bint, 0); |
3198 | MODULE_PARM_DESC(debug_msgs, "Enable debug messages." ); |
3199 | #endif |
3200 | |
3201 | module_init(init_ntfs_fs) |
3202 | module_exit(exit_ntfs_fs) |
3203 | |