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1da177e4 LT |
1 | /* |
2 | * super.c - NTFS kernel super block handling. Part of the Linux-NTFS project. | |
3 | * | |
c002f425 | 4 | * Copyright (c) 2001-2005 Anton Altaparmakov |
1da177e4 LT |
5 | * Copyright (c) 2001,2002 Richard Russon |
6 | * | |
7 | * This program/include file is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License as published | |
9 | * by the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program/include file is distributed in the hope that it will be | |
13 | * useful, but WITHOUT ANY WARRANTY; without even the implied warranty | |
14 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program (in the main directory of the Linux-NTFS | |
19 | * distribution in the file COPYING); if not, write to the Free Software | |
20 | * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | */ | |
22 | ||
23 | #include <linux/stddef.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/string.h> | |
26 | #include <linux/spinlock.h> | |
27 | #include <linux/blkdev.h> /* For bdev_hardsect_size(). */ | |
28 | #include <linux/backing-dev.h> | |
29 | #include <linux/buffer_head.h> | |
30 | #include <linux/vfs.h> | |
31 | #include <linux/moduleparam.h> | |
32 | #include <linux/smp_lock.h> | |
33 | ||
34 | #include "sysctl.h" | |
35 | #include "logfile.h" | |
36 | #include "quota.h" | |
3f2faef0 | 37 | #include "usnjrnl.h" |
1da177e4 LT |
38 | #include "dir.h" |
39 | #include "debug.h" | |
40 | #include "index.h" | |
41 | #include "aops.h" | |
b0d2374d | 42 | #include "layout.h" |
1da177e4 LT |
43 | #include "malloc.h" |
44 | #include "ntfs.h" | |
45 | ||
c002f425 | 46 | /* Number of mounted filesystems which have compression enabled. */ |
1da177e4 LT |
47 | static unsigned long ntfs_nr_compression_users; |
48 | ||
49 | /* A global default upcase table and a corresponding reference count. */ | |
50 | static ntfschar *default_upcase = NULL; | |
51 | static unsigned long ntfs_nr_upcase_users = 0; | |
52 | ||
53 | /* Error constants/strings used in inode.c::ntfs_show_options(). */ | |
54 | typedef enum { | |
55 | /* One of these must be present, default is ON_ERRORS_CONTINUE. */ | |
56 | ON_ERRORS_PANIC = 0x01, | |
57 | ON_ERRORS_REMOUNT_RO = 0x02, | |
58 | ON_ERRORS_CONTINUE = 0x04, | |
59 | /* Optional, can be combined with any of the above. */ | |
60 | ON_ERRORS_RECOVER = 0x10, | |
61 | } ON_ERRORS_ACTIONS; | |
62 | ||
63 | const option_t on_errors_arr[] = { | |
64 | { ON_ERRORS_PANIC, "panic" }, | |
65 | { ON_ERRORS_REMOUNT_RO, "remount-ro", }, | |
66 | { ON_ERRORS_CONTINUE, "continue", }, | |
67 | { ON_ERRORS_RECOVER, "recover" }, | |
68 | { 0, NULL } | |
69 | }; | |
70 | ||
71 | /** | |
72 | * simple_getbool - | |
73 | * | |
74 | * Copied from old ntfs driver (which copied from vfat driver). | |
75 | */ | |
76 | static int simple_getbool(char *s, BOOL *setval) | |
77 | { | |
78 | if (s) { | |
79 | if (!strcmp(s, "1") || !strcmp(s, "yes") || !strcmp(s, "true")) | |
80 | *setval = TRUE; | |
81 | else if (!strcmp(s, "0") || !strcmp(s, "no") || | |
82 | !strcmp(s, "false")) | |
83 | *setval = FALSE; | |
84 | else | |
85 | return 0; | |
86 | } else | |
87 | *setval = TRUE; | |
88 | return 1; | |
89 | } | |
90 | ||
91 | /** | |
92 | * parse_options - parse the (re)mount options | |
93 | * @vol: ntfs volume | |
94 | * @opt: string containing the (re)mount options | |
95 | * | |
96 | * Parse the recognized options in @opt for the ntfs volume described by @vol. | |
97 | */ | |
98 | static BOOL parse_options(ntfs_volume *vol, char *opt) | |
99 | { | |
100 | char *p, *v, *ov; | |
101 | static char *utf8 = "utf8"; | |
102 | int errors = 0, sloppy = 0; | |
103 | uid_t uid = (uid_t)-1; | |
104 | gid_t gid = (gid_t)-1; | |
105 | mode_t fmask = (mode_t)-1, dmask = (mode_t)-1; | |
106 | int mft_zone_multiplier = -1, on_errors = -1; | |
c002f425 | 107 | int show_sys_files = -1, case_sensitive = -1, disable_sparse = -1; |
1da177e4 LT |
108 | struct nls_table *nls_map = NULL, *old_nls; |
109 | ||
110 | /* I am lazy... (-8 */ | |
111 | #define NTFS_GETOPT_WITH_DEFAULT(option, variable, default_value) \ | |
112 | if (!strcmp(p, option)) { \ | |
113 | if (!v || !*v) \ | |
114 | variable = default_value; \ | |
115 | else { \ | |
116 | variable = simple_strtoul(ov = v, &v, 0); \ | |
117 | if (*v) \ | |
118 | goto needs_val; \ | |
119 | } \ | |
120 | } | |
121 | #define NTFS_GETOPT(option, variable) \ | |
122 | if (!strcmp(p, option)) { \ | |
123 | if (!v || !*v) \ | |
124 | goto needs_arg; \ | |
125 | variable = simple_strtoul(ov = v, &v, 0); \ | |
126 | if (*v) \ | |
127 | goto needs_val; \ | |
128 | } | |
5d46770f AA |
129 | #define NTFS_GETOPT_OCTAL(option, variable) \ |
130 | if (!strcmp(p, option)) { \ | |
131 | if (!v || !*v) \ | |
132 | goto needs_arg; \ | |
133 | variable = simple_strtoul(ov = v, &v, 8); \ | |
134 | if (*v) \ | |
135 | goto needs_val; \ | |
136 | } | |
1da177e4 LT |
137 | #define NTFS_GETOPT_BOOL(option, variable) \ |
138 | if (!strcmp(p, option)) { \ | |
139 | BOOL val; \ | |
140 | if (!simple_getbool(v, &val)) \ | |
141 | goto needs_bool; \ | |
142 | variable = val; \ | |
143 | } | |
144 | #define NTFS_GETOPT_OPTIONS_ARRAY(option, variable, opt_array) \ | |
145 | if (!strcmp(p, option)) { \ | |
146 | int _i; \ | |
147 | if (!v || !*v) \ | |
148 | goto needs_arg; \ | |
149 | ov = v; \ | |
150 | if (variable == -1) \ | |
151 | variable = 0; \ | |
152 | for (_i = 0; opt_array[_i].str && *opt_array[_i].str; _i++) \ | |
153 | if (!strcmp(opt_array[_i].str, v)) { \ | |
154 | variable |= opt_array[_i].val; \ | |
155 | break; \ | |
156 | } \ | |
157 | if (!opt_array[_i].str || !*opt_array[_i].str) \ | |
158 | goto needs_val; \ | |
159 | } | |
160 | if (!opt || !*opt) | |
161 | goto no_mount_options; | |
162 | ntfs_debug("Entering with mount options string: %s", opt); | |
163 | while ((p = strsep(&opt, ","))) { | |
164 | if ((v = strchr(p, '='))) | |
165 | *v++ = 0; | |
166 | NTFS_GETOPT("uid", uid) | |
167 | else NTFS_GETOPT("gid", gid) | |
5d46770f AA |
168 | else NTFS_GETOPT_OCTAL("umask", fmask = dmask) |
169 | else NTFS_GETOPT_OCTAL("fmask", fmask) | |
170 | else NTFS_GETOPT_OCTAL("dmask", dmask) | |
1da177e4 LT |
171 | else NTFS_GETOPT("mft_zone_multiplier", mft_zone_multiplier) |
172 | else NTFS_GETOPT_WITH_DEFAULT("sloppy", sloppy, TRUE) | |
173 | else NTFS_GETOPT_BOOL("show_sys_files", show_sys_files) | |
174 | else NTFS_GETOPT_BOOL("case_sensitive", case_sensitive) | |
c002f425 | 175 | else NTFS_GETOPT_BOOL("disable_sparse", disable_sparse) |
1da177e4 LT |
176 | else NTFS_GETOPT_OPTIONS_ARRAY("errors", on_errors, |
177 | on_errors_arr) | |
178 | else if (!strcmp(p, "posix") || !strcmp(p, "show_inodes")) | |
179 | ntfs_warning(vol->sb, "Ignoring obsolete option %s.", | |
180 | p); | |
181 | else if (!strcmp(p, "nls") || !strcmp(p, "iocharset")) { | |
182 | if (!strcmp(p, "iocharset")) | |
183 | ntfs_warning(vol->sb, "Option iocharset is " | |
184 | "deprecated. Please use " | |
185 | "option nls=<charsetname> in " | |
186 | "the future."); | |
187 | if (!v || !*v) | |
188 | goto needs_arg; | |
189 | use_utf8: | |
190 | old_nls = nls_map; | |
191 | nls_map = load_nls(v); | |
192 | if (!nls_map) { | |
193 | if (!old_nls) { | |
194 | ntfs_error(vol->sb, "NLS character set " | |
195 | "%s not found.", v); | |
196 | return FALSE; | |
197 | } | |
198 | ntfs_error(vol->sb, "NLS character set %s not " | |
199 | "found. Using previous one %s.", | |
200 | v, old_nls->charset); | |
201 | nls_map = old_nls; | |
202 | } else /* nls_map */ { | |
203 | if (old_nls) | |
204 | unload_nls(old_nls); | |
205 | } | |
206 | } else if (!strcmp(p, "utf8")) { | |
207 | BOOL val = FALSE; | |
208 | ntfs_warning(vol->sb, "Option utf8 is no longer " | |
209 | "supported, using option nls=utf8. Please " | |
210 | "use option nls=utf8 in the future and " | |
211 | "make sure utf8 is compiled either as a " | |
212 | "module or into the kernel."); | |
213 | if (!v || !*v) | |
214 | val = TRUE; | |
215 | else if (!simple_getbool(v, &val)) | |
216 | goto needs_bool; | |
217 | if (val) { | |
218 | v = utf8; | |
219 | goto use_utf8; | |
220 | } | |
221 | } else { | |
222 | ntfs_error(vol->sb, "Unrecognized mount option %s.", p); | |
223 | if (errors < INT_MAX) | |
224 | errors++; | |
225 | } | |
226 | #undef NTFS_GETOPT_OPTIONS_ARRAY | |
227 | #undef NTFS_GETOPT_BOOL | |
228 | #undef NTFS_GETOPT | |
229 | #undef NTFS_GETOPT_WITH_DEFAULT | |
230 | } | |
231 | no_mount_options: | |
232 | if (errors && !sloppy) | |
233 | return FALSE; | |
234 | if (sloppy) | |
235 | ntfs_warning(vol->sb, "Sloppy option given. Ignoring " | |
236 | "unrecognized mount option(s) and continuing."); | |
237 | /* Keep this first! */ | |
238 | if (on_errors != -1) { | |
239 | if (!on_errors) { | |
240 | ntfs_error(vol->sb, "Invalid errors option argument " | |
241 | "or bug in options parser."); | |
242 | return FALSE; | |
243 | } | |
244 | } | |
245 | if (nls_map) { | |
246 | if (vol->nls_map && vol->nls_map != nls_map) { | |
247 | ntfs_error(vol->sb, "Cannot change NLS character set " | |
248 | "on remount."); | |
249 | return FALSE; | |
250 | } /* else (!vol->nls_map) */ | |
251 | ntfs_debug("Using NLS character set %s.", nls_map->charset); | |
252 | vol->nls_map = nls_map; | |
253 | } else /* (!nls_map) */ { | |
254 | if (!vol->nls_map) { | |
255 | vol->nls_map = load_nls_default(); | |
256 | if (!vol->nls_map) { | |
257 | ntfs_error(vol->sb, "Failed to load default " | |
258 | "NLS character set."); | |
259 | return FALSE; | |
260 | } | |
261 | ntfs_debug("Using default NLS character set (%s).", | |
262 | vol->nls_map->charset); | |
263 | } | |
264 | } | |
265 | if (mft_zone_multiplier != -1) { | |
266 | if (vol->mft_zone_multiplier && vol->mft_zone_multiplier != | |
267 | mft_zone_multiplier) { | |
268 | ntfs_error(vol->sb, "Cannot change mft_zone_multiplier " | |
269 | "on remount."); | |
270 | return FALSE; | |
271 | } | |
272 | if (mft_zone_multiplier < 1 || mft_zone_multiplier > 4) { | |
273 | ntfs_error(vol->sb, "Invalid mft_zone_multiplier. " | |
274 | "Using default value, i.e. 1."); | |
275 | mft_zone_multiplier = 1; | |
276 | } | |
277 | vol->mft_zone_multiplier = mft_zone_multiplier; | |
278 | } | |
279 | if (!vol->mft_zone_multiplier) | |
280 | vol->mft_zone_multiplier = 1; | |
281 | if (on_errors != -1) | |
282 | vol->on_errors = on_errors; | |
283 | if (!vol->on_errors || vol->on_errors == ON_ERRORS_RECOVER) | |
284 | vol->on_errors |= ON_ERRORS_CONTINUE; | |
285 | if (uid != (uid_t)-1) | |
286 | vol->uid = uid; | |
287 | if (gid != (gid_t)-1) | |
288 | vol->gid = gid; | |
289 | if (fmask != (mode_t)-1) | |
290 | vol->fmask = fmask; | |
291 | if (dmask != (mode_t)-1) | |
292 | vol->dmask = dmask; | |
293 | if (show_sys_files != -1) { | |
294 | if (show_sys_files) | |
295 | NVolSetShowSystemFiles(vol); | |
296 | else | |
297 | NVolClearShowSystemFiles(vol); | |
298 | } | |
299 | if (case_sensitive != -1) { | |
300 | if (case_sensitive) | |
301 | NVolSetCaseSensitive(vol); | |
302 | else | |
303 | NVolClearCaseSensitive(vol); | |
304 | } | |
c002f425 AA |
305 | if (disable_sparse != -1) { |
306 | if (disable_sparse) | |
307 | NVolClearSparseEnabled(vol); | |
308 | else { | |
309 | if (!NVolSparseEnabled(vol) && | |
310 | vol->major_ver && vol->major_ver < 3) | |
311 | ntfs_warning(vol->sb, "Not enabling sparse " | |
312 | "support due to NTFS volume " | |
313 | "version %i.%i (need at least " | |
314 | "version 3.0).", vol->major_ver, | |
315 | vol->minor_ver); | |
316 | else | |
317 | NVolSetSparseEnabled(vol); | |
318 | } | |
319 | } | |
1da177e4 LT |
320 | return TRUE; |
321 | needs_arg: | |
322 | ntfs_error(vol->sb, "The %s option requires an argument.", p); | |
323 | return FALSE; | |
324 | needs_bool: | |
325 | ntfs_error(vol->sb, "The %s option requires a boolean argument.", p); | |
326 | return FALSE; | |
327 | needs_val: | |
328 | ntfs_error(vol->sb, "Invalid %s option argument: %s", p, ov); | |
329 | return FALSE; | |
330 | } | |
331 | ||
332 | #ifdef NTFS_RW | |
333 | ||
334 | /** | |
335 | * ntfs_write_volume_flags - write new flags to the volume information flags | |
336 | * @vol: ntfs volume on which to modify the flags | |
337 | * @flags: new flags value for the volume information flags | |
338 | * | |
339 | * Internal function. You probably want to use ntfs_{set,clear}_volume_flags() | |
340 | * instead (see below). | |
341 | * | |
342 | * Replace the volume information flags on the volume @vol with the value | |
343 | * supplied in @flags. Note, this overwrites the volume information flags, so | |
344 | * make sure to combine the flags you want to modify with the old flags and use | |
345 | * the result when calling ntfs_write_volume_flags(). | |
346 | * | |
347 | * Return 0 on success and -errno on error. | |
348 | */ | |
349 | static int ntfs_write_volume_flags(ntfs_volume *vol, const VOLUME_FLAGS flags) | |
350 | { | |
351 | ntfs_inode *ni = NTFS_I(vol->vol_ino); | |
352 | MFT_RECORD *m; | |
353 | VOLUME_INFORMATION *vi; | |
354 | ntfs_attr_search_ctx *ctx; | |
355 | int err; | |
356 | ||
357 | ntfs_debug("Entering, old flags = 0x%x, new flags = 0x%x.", | |
358 | le16_to_cpu(vol->vol_flags), le16_to_cpu(flags)); | |
359 | if (vol->vol_flags == flags) | |
360 | goto done; | |
361 | BUG_ON(!ni); | |
362 | m = map_mft_record(ni); | |
363 | if (IS_ERR(m)) { | |
364 | err = PTR_ERR(m); | |
365 | goto err_out; | |
366 | } | |
367 | ctx = ntfs_attr_get_search_ctx(ni, m); | |
368 | if (!ctx) { | |
369 | err = -ENOMEM; | |
370 | goto put_unm_err_out; | |
371 | } | |
372 | err = ntfs_attr_lookup(AT_VOLUME_INFORMATION, NULL, 0, 0, 0, NULL, 0, | |
373 | ctx); | |
374 | if (err) | |
375 | goto put_unm_err_out; | |
376 | vi = (VOLUME_INFORMATION*)((u8*)ctx->attr + | |
377 | le16_to_cpu(ctx->attr->data.resident.value_offset)); | |
378 | vol->vol_flags = vi->flags = flags; | |
379 | flush_dcache_mft_record_page(ctx->ntfs_ino); | |
380 | mark_mft_record_dirty(ctx->ntfs_ino); | |
381 | ntfs_attr_put_search_ctx(ctx); | |
382 | unmap_mft_record(ni); | |
383 | done: | |
384 | ntfs_debug("Done."); | |
385 | return 0; | |
386 | put_unm_err_out: | |
387 | if (ctx) | |
388 | ntfs_attr_put_search_ctx(ctx); | |
389 | unmap_mft_record(ni); | |
390 | err_out: | |
391 | ntfs_error(vol->sb, "Failed with error code %i.", -err); | |
392 | return err; | |
393 | } | |
394 | ||
395 | /** | |
396 | * ntfs_set_volume_flags - set bits in the volume information flags | |
397 | * @vol: ntfs volume on which to modify the flags | |
398 | * @flags: flags to set on the volume | |
399 | * | |
400 | * Set the bits in @flags in the volume information flags on the volume @vol. | |
401 | * | |
402 | * Return 0 on success and -errno on error. | |
403 | */ | |
404 | static inline int ntfs_set_volume_flags(ntfs_volume *vol, VOLUME_FLAGS flags) | |
405 | { | |
406 | flags &= VOLUME_FLAGS_MASK; | |
407 | return ntfs_write_volume_flags(vol, vol->vol_flags | flags); | |
408 | } | |
409 | ||
410 | /** | |
411 | * ntfs_clear_volume_flags - clear bits in the volume information flags | |
412 | * @vol: ntfs volume on which to modify the flags | |
413 | * @flags: flags to clear on the volume | |
414 | * | |
415 | * Clear the bits in @flags in the volume information flags on the volume @vol. | |
416 | * | |
417 | * Return 0 on success and -errno on error. | |
418 | */ | |
419 | static inline int ntfs_clear_volume_flags(ntfs_volume *vol, VOLUME_FLAGS flags) | |
420 | { | |
421 | flags &= VOLUME_FLAGS_MASK; | |
422 | flags = vol->vol_flags & cpu_to_le16(~le16_to_cpu(flags)); | |
423 | return ntfs_write_volume_flags(vol, flags); | |
424 | } | |
425 | ||
426 | #endif /* NTFS_RW */ | |
427 | ||
428 | /** | |
429 | * ntfs_remount - change the mount options of a mounted ntfs filesystem | |
430 | * @sb: superblock of mounted ntfs filesystem | |
431 | * @flags: remount flags | |
432 | * @opt: remount options string | |
433 | * | |
434 | * Change the mount options of an already mounted ntfs filesystem. | |
435 | * | |
436 | * NOTE: The VFS sets the @sb->s_flags remount flags to @flags after | |
437 | * ntfs_remount() returns successfully (i.e. returns 0). Otherwise, | |
438 | * @sb->s_flags are not changed. | |
439 | */ | |
440 | static int ntfs_remount(struct super_block *sb, int *flags, char *opt) | |
441 | { | |
442 | ntfs_volume *vol = NTFS_SB(sb); | |
443 | ||
444 | ntfs_debug("Entering with remount options string: %s", opt); | |
445 | #ifndef NTFS_RW | |
24a44dca CH |
446 | /* For read-only compiled driver, enforce read-only flag. */ |
447 | *flags |= MS_RDONLY; | |
1da177e4 LT |
448 | #else /* NTFS_RW */ |
449 | /* | |
450 | * For the read-write compiled driver, if we are remounting read-write, | |
451 | * make sure there are no volume errors and that no unsupported volume | |
452 | * flags are set. Also, empty the logfile journal as it would become | |
453 | * stale as soon as something is written to the volume and mark the | |
454 | * volume dirty so that chkdsk is run if the volume is not umounted | |
455 | * cleanly. Finally, mark the quotas out of date so Windows rescans | |
456 | * the volume on boot and updates them. | |
457 | * | |
458 | * When remounting read-only, mark the volume clean if no volume errors | |
459 | * have occured. | |
460 | */ | |
461 | if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) { | |
462 | static const char *es = ". Cannot remount read-write."; | |
463 | ||
464 | /* Remounting read-write. */ | |
465 | if (NVolErrors(vol)) { | |
466 | ntfs_error(sb, "Volume has errors and is read-only%s", | |
467 | es); | |
468 | return -EROFS; | |
469 | } | |
470 | if (vol->vol_flags & VOLUME_IS_DIRTY) { | |
471 | ntfs_error(sb, "Volume is dirty and read-only%s", es); | |
472 | return -EROFS; | |
473 | } | |
474 | if (vol->vol_flags & VOLUME_MUST_MOUNT_RO_MASK) { | |
475 | ntfs_error(sb, "Volume has unsupported flags set and " | |
476 | "is read-only%s", es); | |
477 | return -EROFS; | |
478 | } | |
479 | if (ntfs_set_volume_flags(vol, VOLUME_IS_DIRTY)) { | |
480 | ntfs_error(sb, "Failed to set dirty bit in volume " | |
481 | "information flags%s", es); | |
482 | return -EROFS; | |
483 | } | |
484 | #if 0 | |
485 | // TODO: Enable this code once we start modifying anything that | |
486 | // is different between NTFS 1.2 and 3.x... | |
487 | /* Set NT4 compatibility flag on newer NTFS version volumes. */ | |
488 | if ((vol->major_ver > 1)) { | |
489 | if (ntfs_set_volume_flags(vol, VOLUME_MOUNTED_ON_NT4)) { | |
490 | ntfs_error(sb, "Failed to set NT4 " | |
491 | "compatibility flag%s", es); | |
492 | NVolSetErrors(vol); | |
493 | return -EROFS; | |
494 | } | |
495 | } | |
496 | #endif | |
497 | if (!ntfs_empty_logfile(vol->logfile_ino)) { | |
498 | ntfs_error(sb, "Failed to empty journal $LogFile%s", | |
499 | es); | |
500 | NVolSetErrors(vol); | |
501 | return -EROFS; | |
502 | } | |
503 | if (!ntfs_mark_quotas_out_of_date(vol)) { | |
504 | ntfs_error(sb, "Failed to mark quotas out of date%s", | |
505 | es); | |
506 | NVolSetErrors(vol); | |
507 | return -EROFS; | |
508 | } | |
3f2faef0 AA |
509 | if (!ntfs_stamp_usnjrnl(vol)) { |
510 | ntfs_error(sb, "Failed to stamp transation log " | |
511 | "($UsnJrnl)%s", es); | |
512 | NVolSetErrors(vol); | |
513 | return -EROFS; | |
514 | } | |
1da177e4 LT |
515 | } else if (!(sb->s_flags & MS_RDONLY) && (*flags & MS_RDONLY)) { |
516 | /* Remounting read-only. */ | |
517 | if (!NVolErrors(vol)) { | |
518 | if (ntfs_clear_volume_flags(vol, VOLUME_IS_DIRTY)) | |
519 | ntfs_warning(sb, "Failed to clear dirty bit " | |
520 | "in volume information " | |
521 | "flags. Run chkdsk."); | |
522 | } | |
523 | } | |
524 | #endif /* NTFS_RW */ | |
525 | ||
526 | // TODO: Deal with *flags. | |
527 | ||
528 | if (!parse_options(vol, opt)) | |
529 | return -EINVAL; | |
530 | ntfs_debug("Done."); | |
531 | return 0; | |
532 | } | |
533 | ||
534 | /** | |
535 | * is_boot_sector_ntfs - check whether a boot sector is a valid NTFS boot sector | |
536 | * @sb: Super block of the device to which @b belongs. | |
537 | * @b: Boot sector of device @sb to check. | |
538 | * @silent: If TRUE, all output will be silenced. | |
539 | * | |
540 | * is_boot_sector_ntfs() checks whether the boot sector @b is a valid NTFS boot | |
541 | * sector. Returns TRUE if it is valid and FALSE if not. | |
542 | * | |
543 | * @sb is only needed for warning/error output, i.e. it can be NULL when silent | |
544 | * is TRUE. | |
545 | */ | |
546 | static BOOL is_boot_sector_ntfs(const struct super_block *sb, | |
547 | const NTFS_BOOT_SECTOR *b, const BOOL silent) | |
548 | { | |
549 | /* | |
550 | * Check that checksum == sum of u32 values from b to the checksum | |
b0d2374d AA |
551 | * field. If checksum is zero, no checking is done. We will work when |
552 | * the checksum test fails, since some utilities update the boot sector | |
553 | * ignoring the checksum which leaves the checksum out-of-date. We | |
554 | * report a warning if this is the case. | |
1da177e4 | 555 | */ |
b0d2374d | 556 | if ((void*)b < (void*)&b->checksum && b->checksum && !silent) { |
1da177e4 LT |
557 | le32 *u; |
558 | u32 i; | |
559 | ||
560 | for (i = 0, u = (le32*)b; u < (le32*)(&b->checksum); ++u) | |
561 | i += le32_to_cpup(u); | |
562 | if (le32_to_cpu(b->checksum) != i) | |
b0d2374d | 563 | ntfs_warning(sb, "Invalid boot sector checksum."); |
1da177e4 LT |
564 | } |
565 | /* Check OEMidentifier is "NTFS " */ | |
566 | if (b->oem_id != magicNTFS) | |
567 | goto not_ntfs; | |
568 | /* Check bytes per sector value is between 256 and 4096. */ | |
569 | if (le16_to_cpu(b->bpb.bytes_per_sector) < 0x100 || | |
570 | le16_to_cpu(b->bpb.bytes_per_sector) > 0x1000) | |
571 | goto not_ntfs; | |
572 | /* Check sectors per cluster value is valid. */ | |
573 | switch (b->bpb.sectors_per_cluster) { | |
574 | case 1: case 2: case 4: case 8: case 16: case 32: case 64: case 128: | |
575 | break; | |
576 | default: | |
577 | goto not_ntfs; | |
578 | } | |
7fafb8b6 | 579 | /* Check the cluster size is not above the maximum (64kiB). */ |
1da177e4 | 580 | if ((u32)le16_to_cpu(b->bpb.bytes_per_sector) * |
7fafb8b6 | 581 | b->bpb.sectors_per_cluster > NTFS_MAX_CLUSTER_SIZE) |
1da177e4 LT |
582 | goto not_ntfs; |
583 | /* Check reserved/unused fields are really zero. */ | |
584 | if (le16_to_cpu(b->bpb.reserved_sectors) || | |
585 | le16_to_cpu(b->bpb.root_entries) || | |
586 | le16_to_cpu(b->bpb.sectors) || | |
587 | le16_to_cpu(b->bpb.sectors_per_fat) || | |
588 | le32_to_cpu(b->bpb.large_sectors) || b->bpb.fats) | |
589 | goto not_ntfs; | |
590 | /* Check clusters per file mft record value is valid. */ | |
591 | if ((u8)b->clusters_per_mft_record < 0xe1 || | |
592 | (u8)b->clusters_per_mft_record > 0xf7) | |
593 | switch (b->clusters_per_mft_record) { | |
594 | case 1: case 2: case 4: case 8: case 16: case 32: case 64: | |
595 | break; | |
596 | default: | |
597 | goto not_ntfs; | |
598 | } | |
599 | /* Check clusters per index block value is valid. */ | |
600 | if ((u8)b->clusters_per_index_record < 0xe1 || | |
601 | (u8)b->clusters_per_index_record > 0xf7) | |
602 | switch (b->clusters_per_index_record) { | |
603 | case 1: case 2: case 4: case 8: case 16: case 32: case 64: | |
604 | break; | |
605 | default: | |
606 | goto not_ntfs; | |
607 | } | |
608 | /* | |
609 | * Check for valid end of sector marker. We will work without it, but | |
610 | * many BIOSes will refuse to boot from a bootsector if the magic is | |
611 | * incorrect, so we emit a warning. | |
612 | */ | |
b0d2374d | 613 | if (!silent && b->end_of_sector_marker != const_cpu_to_le16(0xaa55)) |
1da177e4 LT |
614 | ntfs_warning(sb, "Invalid end of sector marker."); |
615 | return TRUE; | |
616 | not_ntfs: | |
617 | return FALSE; | |
618 | } | |
619 | ||
620 | /** | |
621 | * read_ntfs_boot_sector - read the NTFS boot sector of a device | |
622 | * @sb: super block of device to read the boot sector from | |
623 | * @silent: if true, suppress all output | |
624 | * | |
625 | * Reads the boot sector from the device and validates it. If that fails, tries | |
626 | * to read the backup boot sector, first from the end of the device a-la NT4 and | |
627 | * later and then from the middle of the device a-la NT3.51 and before. | |
628 | * | |
629 | * If a valid boot sector is found but it is not the primary boot sector, we | |
630 | * repair the primary boot sector silently (unless the device is read-only or | |
631 | * the primary boot sector is not accessible). | |
632 | * | |
633 | * NOTE: To call this function, @sb must have the fields s_dev, the ntfs super | |
634 | * block (u.ntfs_sb), nr_blocks and the device flags (s_flags) initialized | |
635 | * to their respective values. | |
636 | * | |
637 | * Return the unlocked buffer head containing the boot sector or NULL on error. | |
638 | */ | |
639 | static struct buffer_head *read_ntfs_boot_sector(struct super_block *sb, | |
640 | const int silent) | |
641 | { | |
642 | const char *read_err_str = "Unable to read %s boot sector."; | |
643 | struct buffer_head *bh_primary, *bh_backup; | |
644 | long nr_blocks = NTFS_SB(sb)->nr_blocks; | |
645 | ||
646 | /* Try to read primary boot sector. */ | |
647 | if ((bh_primary = sb_bread(sb, 0))) { | |
648 | if (is_boot_sector_ntfs(sb, (NTFS_BOOT_SECTOR*) | |
649 | bh_primary->b_data, silent)) | |
650 | return bh_primary; | |
651 | if (!silent) | |
652 | ntfs_error(sb, "Primary boot sector is invalid."); | |
653 | } else if (!silent) | |
654 | ntfs_error(sb, read_err_str, "primary"); | |
655 | if (!(NTFS_SB(sb)->on_errors & ON_ERRORS_RECOVER)) { | |
656 | if (bh_primary) | |
657 | brelse(bh_primary); | |
658 | if (!silent) | |
659 | ntfs_error(sb, "Mount option errors=recover not used. " | |
660 | "Aborting without trying to recover."); | |
661 | return NULL; | |
662 | } | |
663 | /* Try to read NT4+ backup boot sector. */ | |
664 | if ((bh_backup = sb_bread(sb, nr_blocks - 1))) { | |
665 | if (is_boot_sector_ntfs(sb, (NTFS_BOOT_SECTOR*) | |
666 | bh_backup->b_data, silent)) | |
667 | goto hotfix_primary_boot_sector; | |
668 | brelse(bh_backup); | |
669 | } else if (!silent) | |
670 | ntfs_error(sb, read_err_str, "backup"); | |
671 | /* Try to read NT3.51- backup boot sector. */ | |
672 | if ((bh_backup = sb_bread(sb, nr_blocks >> 1))) { | |
673 | if (is_boot_sector_ntfs(sb, (NTFS_BOOT_SECTOR*) | |
674 | bh_backup->b_data, silent)) | |
675 | goto hotfix_primary_boot_sector; | |
676 | if (!silent) | |
677 | ntfs_error(sb, "Could not find a valid backup boot " | |
678 | "sector."); | |
679 | brelse(bh_backup); | |
680 | } else if (!silent) | |
681 | ntfs_error(sb, read_err_str, "backup"); | |
682 | /* We failed. Cleanup and return. */ | |
683 | if (bh_primary) | |
684 | brelse(bh_primary); | |
685 | return NULL; | |
686 | hotfix_primary_boot_sector: | |
687 | if (bh_primary) { | |
688 | /* | |
689 | * If we managed to read sector zero and the volume is not | |
690 | * read-only, copy the found, valid backup boot sector to the | |
691 | * primary boot sector. | |
692 | */ | |
693 | if (!(sb->s_flags & MS_RDONLY)) { | |
694 | ntfs_warning(sb, "Hot-fix: Recovering invalid primary " | |
695 | "boot sector from backup copy."); | |
696 | memcpy(bh_primary->b_data, bh_backup->b_data, | |
697 | sb->s_blocksize); | |
698 | mark_buffer_dirty(bh_primary); | |
699 | sync_dirty_buffer(bh_primary); | |
700 | if (buffer_uptodate(bh_primary)) { | |
701 | brelse(bh_backup); | |
702 | return bh_primary; | |
703 | } | |
704 | ntfs_error(sb, "Hot-fix: Device write error while " | |
705 | "recovering primary boot sector."); | |
706 | } else { | |
707 | ntfs_warning(sb, "Hot-fix: Recovery of primary boot " | |
708 | "sector failed: Read-only mount."); | |
709 | } | |
710 | brelse(bh_primary); | |
711 | } | |
712 | ntfs_warning(sb, "Using backup boot sector."); | |
713 | return bh_backup; | |
714 | } | |
715 | ||
716 | /** | |
717 | * parse_ntfs_boot_sector - parse the boot sector and store the data in @vol | |
718 | * @vol: volume structure to initialise with data from boot sector | |
719 | * @b: boot sector to parse | |
720 | * | |
721 | * Parse the ntfs boot sector @b and store all imporant information therein in | |
722 | * the ntfs super block @vol. Return TRUE on success and FALSE on error. | |
723 | */ | |
724 | static BOOL parse_ntfs_boot_sector(ntfs_volume *vol, const NTFS_BOOT_SECTOR *b) | |
725 | { | |
726 | unsigned int sectors_per_cluster_bits, nr_hidden_sects; | |
727 | int clusters_per_mft_record, clusters_per_index_record; | |
728 | s64 ll; | |
729 | ||
730 | vol->sector_size = le16_to_cpu(b->bpb.bytes_per_sector); | |
731 | vol->sector_size_bits = ffs(vol->sector_size) - 1; | |
732 | ntfs_debug("vol->sector_size = %i (0x%x)", vol->sector_size, | |
733 | vol->sector_size); | |
734 | ntfs_debug("vol->sector_size_bits = %i (0x%x)", vol->sector_size_bits, | |
735 | vol->sector_size_bits); | |
736 | if (vol->sector_size != vol->sb->s_blocksize) | |
737 | ntfs_warning(vol->sb, "The boot sector indicates a sector size " | |
738 | "different from the device sector size."); | |
739 | ntfs_debug("sectors_per_cluster = 0x%x", b->bpb.sectors_per_cluster); | |
740 | sectors_per_cluster_bits = ffs(b->bpb.sectors_per_cluster) - 1; | |
741 | ntfs_debug("sectors_per_cluster_bits = 0x%x", | |
742 | sectors_per_cluster_bits); | |
743 | nr_hidden_sects = le32_to_cpu(b->bpb.hidden_sectors); | |
744 | ntfs_debug("number of hidden sectors = 0x%x", nr_hidden_sects); | |
745 | vol->cluster_size = vol->sector_size << sectors_per_cluster_bits; | |
746 | vol->cluster_size_mask = vol->cluster_size - 1; | |
747 | vol->cluster_size_bits = ffs(vol->cluster_size) - 1; | |
748 | ntfs_debug("vol->cluster_size = %i (0x%x)", vol->cluster_size, | |
749 | vol->cluster_size); | |
750 | ntfs_debug("vol->cluster_size_mask = 0x%x", vol->cluster_size_mask); | |
751 | ntfs_debug("vol->cluster_size_bits = %i (0x%x)", | |
752 | vol->cluster_size_bits, vol->cluster_size_bits); | |
753 | if (vol->sector_size > vol->cluster_size) { | |
754 | ntfs_error(vol->sb, "Sector sizes above the cluster size are " | |
755 | "not supported. Sorry."); | |
756 | return FALSE; | |
757 | } | |
758 | if (vol->sb->s_blocksize > vol->cluster_size) { | |
759 | ntfs_error(vol->sb, "Cluster sizes smaller than the device " | |
760 | "sector size are not supported. Sorry."); | |
761 | return FALSE; | |
762 | } | |
763 | clusters_per_mft_record = b->clusters_per_mft_record; | |
764 | ntfs_debug("clusters_per_mft_record = %i (0x%x)", | |
765 | clusters_per_mft_record, clusters_per_mft_record); | |
766 | if (clusters_per_mft_record > 0) | |
767 | vol->mft_record_size = vol->cluster_size << | |
768 | (ffs(clusters_per_mft_record) - 1); | |
769 | else | |
770 | /* | |
771 | * When mft_record_size < cluster_size, clusters_per_mft_record | |
772 | * = -log2(mft_record_size) bytes. mft_record_size normaly is | |
773 | * 1024 bytes, which is encoded as 0xF6 (-10 in decimal). | |
774 | */ | |
775 | vol->mft_record_size = 1 << -clusters_per_mft_record; | |
776 | vol->mft_record_size_mask = vol->mft_record_size - 1; | |
777 | vol->mft_record_size_bits = ffs(vol->mft_record_size) - 1; | |
778 | ntfs_debug("vol->mft_record_size = %i (0x%x)", vol->mft_record_size, | |
779 | vol->mft_record_size); | |
780 | ntfs_debug("vol->mft_record_size_mask = 0x%x", | |
781 | vol->mft_record_size_mask); | |
782 | ntfs_debug("vol->mft_record_size_bits = %i (0x%x)", | |
783 | vol->mft_record_size_bits, vol->mft_record_size_bits); | |
784 | /* | |
785 | * We cannot support mft record sizes above the PAGE_CACHE_SIZE since | |
786 | * we store $MFT/$DATA, the table of mft records in the page cache. | |
787 | */ | |
788 | if (vol->mft_record_size > PAGE_CACHE_SIZE) { | |
789 | ntfs_error(vol->sb, "Mft record size %i (0x%x) exceeds the " | |
790 | "page cache size on your system %lu (0x%lx). " | |
791 | "This is not supported. Sorry.", | |
792 | vol->mft_record_size, vol->mft_record_size, | |
793 | PAGE_CACHE_SIZE, PAGE_CACHE_SIZE); | |
794 | return FALSE; | |
795 | } | |
796 | clusters_per_index_record = b->clusters_per_index_record; | |
797 | ntfs_debug("clusters_per_index_record = %i (0x%x)", | |
798 | clusters_per_index_record, clusters_per_index_record); | |
799 | if (clusters_per_index_record > 0) | |
800 | vol->index_record_size = vol->cluster_size << | |
801 | (ffs(clusters_per_index_record) - 1); | |
802 | else | |
803 | /* | |
804 | * When index_record_size < cluster_size, | |
805 | * clusters_per_index_record = -log2(index_record_size) bytes. | |
806 | * index_record_size normaly equals 4096 bytes, which is | |
807 | * encoded as 0xF4 (-12 in decimal). | |
808 | */ | |
809 | vol->index_record_size = 1 << -clusters_per_index_record; | |
810 | vol->index_record_size_mask = vol->index_record_size - 1; | |
811 | vol->index_record_size_bits = ffs(vol->index_record_size) - 1; | |
812 | ntfs_debug("vol->index_record_size = %i (0x%x)", | |
813 | vol->index_record_size, vol->index_record_size); | |
814 | ntfs_debug("vol->index_record_size_mask = 0x%x", | |
815 | vol->index_record_size_mask); | |
816 | ntfs_debug("vol->index_record_size_bits = %i (0x%x)", | |
817 | vol->index_record_size_bits, | |
818 | vol->index_record_size_bits); | |
819 | /* | |
820 | * Get the size of the volume in clusters and check for 64-bit-ness. | |
821 | * Windows currently only uses 32 bits to save the clusters so we do | |
822 | * the same as it is much faster on 32-bit CPUs. | |
823 | */ | |
824 | ll = sle64_to_cpu(b->number_of_sectors) >> sectors_per_cluster_bits; | |
825 | if ((u64)ll >= 1ULL << 32) { | |
826 | ntfs_error(vol->sb, "Cannot handle 64-bit clusters. Sorry."); | |
827 | return FALSE; | |
828 | } | |
829 | vol->nr_clusters = ll; | |
830 | ntfs_debug("vol->nr_clusters = 0x%llx", (long long)vol->nr_clusters); | |
831 | /* | |
832 | * On an architecture where unsigned long is 32-bits, we restrict the | |
833 | * volume size to 2TiB (2^41). On a 64-bit architecture, the compiler | |
834 | * will hopefully optimize the whole check away. | |
835 | */ | |
836 | if (sizeof(unsigned long) < 8) { | |
837 | if ((ll << vol->cluster_size_bits) >= (1ULL << 41)) { | |
838 | ntfs_error(vol->sb, "Volume size (%lluTiB) is too " | |
839 | "large for this architecture. " | |
840 | "Maximum supported is 2TiB. Sorry.", | |
841 | (unsigned long long)ll >> (40 - | |
842 | vol->cluster_size_bits)); | |
843 | return FALSE; | |
844 | } | |
845 | } | |
846 | ll = sle64_to_cpu(b->mft_lcn); | |
847 | if (ll >= vol->nr_clusters) { | |
848 | ntfs_error(vol->sb, "MFT LCN is beyond end of volume. Weird."); | |
849 | return FALSE; | |
850 | } | |
851 | vol->mft_lcn = ll; | |
852 | ntfs_debug("vol->mft_lcn = 0x%llx", (long long)vol->mft_lcn); | |
853 | ll = sle64_to_cpu(b->mftmirr_lcn); | |
854 | if (ll >= vol->nr_clusters) { | |
855 | ntfs_error(vol->sb, "MFTMirr LCN is beyond end of volume. " | |
856 | "Weird."); | |
857 | return FALSE; | |
858 | } | |
859 | vol->mftmirr_lcn = ll; | |
860 | ntfs_debug("vol->mftmirr_lcn = 0x%llx", (long long)vol->mftmirr_lcn); | |
861 | #ifdef NTFS_RW | |
862 | /* | |
863 | * Work out the size of the mft mirror in number of mft records. If the | |
864 | * cluster size is less than or equal to the size taken by four mft | |
865 | * records, the mft mirror stores the first four mft records. If the | |
866 | * cluster size is bigger than the size taken by four mft records, the | |
867 | * mft mirror contains as many mft records as will fit into one | |
868 | * cluster. | |
869 | */ | |
870 | if (vol->cluster_size <= (4 << vol->mft_record_size_bits)) | |
871 | vol->mftmirr_size = 4; | |
872 | else | |
873 | vol->mftmirr_size = vol->cluster_size >> | |
874 | vol->mft_record_size_bits; | |
875 | ntfs_debug("vol->mftmirr_size = %i", vol->mftmirr_size); | |
876 | #endif /* NTFS_RW */ | |
877 | vol->serial_no = le64_to_cpu(b->volume_serial_number); | |
878 | ntfs_debug("vol->serial_no = 0x%llx", | |
879 | (unsigned long long)vol->serial_no); | |
880 | return TRUE; | |
881 | } | |
882 | ||
883 | /** | |
884 | * ntfs_setup_allocators - initialize the cluster and mft allocators | |
885 | * @vol: volume structure for which to setup the allocators | |
886 | * | |
887 | * Setup the cluster (lcn) and mft allocators to the starting values. | |
888 | */ | |
889 | static void ntfs_setup_allocators(ntfs_volume *vol) | |
890 | { | |
891 | #ifdef NTFS_RW | |
892 | LCN mft_zone_size, mft_lcn; | |
893 | #endif /* NTFS_RW */ | |
894 | ||
895 | ntfs_debug("vol->mft_zone_multiplier = 0x%x", | |
896 | vol->mft_zone_multiplier); | |
897 | #ifdef NTFS_RW | |
898 | /* Determine the size of the MFT zone. */ | |
899 | mft_zone_size = vol->nr_clusters; | |
900 | switch (vol->mft_zone_multiplier) { /* % of volume size in clusters */ | |
901 | case 4: | |
902 | mft_zone_size >>= 1; /* 50% */ | |
903 | break; | |
904 | case 3: | |
905 | mft_zone_size = (mft_zone_size + | |
906 | (mft_zone_size >> 1)) >> 2; /* 37.5% */ | |
907 | break; | |
908 | case 2: | |
909 | mft_zone_size >>= 2; /* 25% */ | |
910 | break; | |
911 | /* case 1: */ | |
912 | default: | |
913 | mft_zone_size >>= 3; /* 12.5% */ | |
914 | break; | |
915 | } | |
916 | /* Setup the mft zone. */ | |
917 | vol->mft_zone_start = vol->mft_zone_pos = vol->mft_lcn; | |
918 | ntfs_debug("vol->mft_zone_pos = 0x%llx", | |
919 | (unsigned long long)vol->mft_zone_pos); | |
920 | /* | |
921 | * Calculate the mft_lcn for an unmodified NTFS volume (see mkntfs | |
922 | * source) and if the actual mft_lcn is in the expected place or even | |
923 | * further to the front of the volume, extend the mft_zone to cover the | |
924 | * beginning of the volume as well. This is in order to protect the | |
925 | * area reserved for the mft bitmap as well within the mft_zone itself. | |
926 | * On non-standard volumes we do not protect it as the overhead would | |
927 | * be higher than the speed increase we would get by doing it. | |
928 | */ | |
929 | mft_lcn = (8192 + 2 * vol->cluster_size - 1) / vol->cluster_size; | |
930 | if (mft_lcn * vol->cluster_size < 16 * 1024) | |
931 | mft_lcn = (16 * 1024 + vol->cluster_size - 1) / | |
932 | vol->cluster_size; | |
933 | if (vol->mft_zone_start <= mft_lcn) | |
934 | vol->mft_zone_start = 0; | |
935 | ntfs_debug("vol->mft_zone_start = 0x%llx", | |
936 | (unsigned long long)vol->mft_zone_start); | |
937 | /* | |
938 | * Need to cap the mft zone on non-standard volumes so that it does | |
939 | * not point outside the boundaries of the volume. We do this by | |
940 | * halving the zone size until we are inside the volume. | |
941 | */ | |
942 | vol->mft_zone_end = vol->mft_lcn + mft_zone_size; | |
943 | while (vol->mft_zone_end >= vol->nr_clusters) { | |
944 | mft_zone_size >>= 1; | |
945 | vol->mft_zone_end = vol->mft_lcn + mft_zone_size; | |
946 | } | |
947 | ntfs_debug("vol->mft_zone_end = 0x%llx", | |
948 | (unsigned long long)vol->mft_zone_end); | |
949 | /* | |
950 | * Set the current position within each data zone to the start of the | |
951 | * respective zone. | |
952 | */ | |
953 | vol->data1_zone_pos = vol->mft_zone_end; | |
954 | ntfs_debug("vol->data1_zone_pos = 0x%llx", | |
955 | (unsigned long long)vol->data1_zone_pos); | |
956 | vol->data2_zone_pos = 0; | |
957 | ntfs_debug("vol->data2_zone_pos = 0x%llx", | |
958 | (unsigned long long)vol->data2_zone_pos); | |
959 | ||
960 | /* Set the mft data allocation position to mft record 24. */ | |
961 | vol->mft_data_pos = 24; | |
962 | ntfs_debug("vol->mft_data_pos = 0x%llx", | |
963 | (unsigned long long)vol->mft_data_pos); | |
964 | #endif /* NTFS_RW */ | |
965 | } | |
966 | ||
967 | #ifdef NTFS_RW | |
968 | ||
969 | /** | |
970 | * load_and_init_mft_mirror - load and setup the mft mirror inode for a volume | |
971 | * @vol: ntfs super block describing device whose mft mirror to load | |
972 | * | |
973 | * Return TRUE on success or FALSE on error. | |
974 | */ | |
975 | static BOOL load_and_init_mft_mirror(ntfs_volume *vol) | |
976 | { | |
977 | struct inode *tmp_ino; | |
978 | ntfs_inode *tmp_ni; | |
979 | ||
980 | ntfs_debug("Entering."); | |
981 | /* Get mft mirror inode. */ | |
982 | tmp_ino = ntfs_iget(vol->sb, FILE_MFTMirr); | |
983 | if (IS_ERR(tmp_ino) || is_bad_inode(tmp_ino)) { | |
984 | if (!IS_ERR(tmp_ino)) | |
985 | iput(tmp_ino); | |
986 | /* Caller will display error message. */ | |
987 | return FALSE; | |
988 | } | |
989 | /* | |
990 | * Re-initialize some specifics about $MFTMirr's inode as | |
991 | * ntfs_read_inode() will have set up the default ones. | |
992 | */ | |
993 | /* Set uid and gid to root. */ | |
994 | tmp_ino->i_uid = tmp_ino->i_gid = 0; | |
995 | /* Regular file. No access for anyone. */ | |
996 | tmp_ino->i_mode = S_IFREG; | |
997 | /* No VFS initiated operations allowed for $MFTMirr. */ | |
998 | tmp_ino->i_op = &ntfs_empty_inode_ops; | |
999 | tmp_ino->i_fop = &ntfs_empty_file_ops; | |
1000 | /* Put in our special address space operations. */ | |
1001 | tmp_ino->i_mapping->a_ops = &ntfs_mst_aops; | |
1002 | tmp_ni = NTFS_I(tmp_ino); | |
1003 | /* The $MFTMirr, like the $MFT is multi sector transfer protected. */ | |
1004 | NInoSetMstProtected(tmp_ni); | |
c002f425 | 1005 | NInoSetSparseDisabled(tmp_ni); |
1da177e4 LT |
1006 | /* |
1007 | * Set up our little cheat allowing us to reuse the async read io | |
1008 | * completion handler for directories. | |
1009 | */ | |
1010 | tmp_ni->itype.index.block_size = vol->mft_record_size; | |
1011 | tmp_ni->itype.index.block_size_bits = vol->mft_record_size_bits; | |
1012 | vol->mftmirr_ino = tmp_ino; | |
1013 | ntfs_debug("Done."); | |
1014 | return TRUE; | |
1015 | } | |
1016 | ||
1017 | /** | |
1018 | * check_mft_mirror - compare contents of the mft mirror with the mft | |
1019 | * @vol: ntfs super block describing device whose mft mirror to check | |
1020 | * | |
1021 | * Return TRUE on success or FALSE on error. | |
1022 | * | |
1023 | * Note, this function also results in the mft mirror runlist being completely | |
1024 | * mapped into memory. The mft mirror write code requires this and will BUG() | |
1025 | * should it find an unmapped runlist element. | |
1026 | */ | |
1027 | static BOOL check_mft_mirror(ntfs_volume *vol) | |
1028 | { | |
1da177e4 LT |
1029 | struct super_block *sb = vol->sb; |
1030 | ntfs_inode *mirr_ni; | |
1031 | struct page *mft_page, *mirr_page; | |
1032 | u8 *kmft, *kmirr; | |
1033 | runlist_element *rl, rl2[2]; | |
218357ff | 1034 | pgoff_t index; |
1da177e4 LT |
1035 | int mrecs_per_page, i; |
1036 | ||
1037 | ntfs_debug("Entering."); | |
1038 | /* Compare contents of $MFT and $MFTMirr. */ | |
1039 | mrecs_per_page = PAGE_CACHE_SIZE / vol->mft_record_size; | |
1040 | BUG_ON(!mrecs_per_page); | |
1041 | BUG_ON(!vol->mftmirr_size); | |
1042 | mft_page = mirr_page = NULL; | |
1043 | kmft = kmirr = NULL; | |
1044 | index = i = 0; | |
1045 | do { | |
1046 | u32 bytes; | |
1047 | ||
1048 | /* Switch pages if necessary. */ | |
1049 | if (!(i % mrecs_per_page)) { | |
1050 | if (index) { | |
1051 | ntfs_unmap_page(mft_page); | |
1052 | ntfs_unmap_page(mirr_page); | |
1053 | } | |
1054 | /* Get the $MFT page. */ | |
1055 | mft_page = ntfs_map_page(vol->mft_ino->i_mapping, | |
1056 | index); | |
1057 | if (IS_ERR(mft_page)) { | |
1058 | ntfs_error(sb, "Failed to read $MFT."); | |
1059 | return FALSE; | |
1060 | } | |
1061 | kmft = page_address(mft_page); | |
1062 | /* Get the $MFTMirr page. */ | |
1063 | mirr_page = ntfs_map_page(vol->mftmirr_ino->i_mapping, | |
1064 | index); | |
1065 | if (IS_ERR(mirr_page)) { | |
1066 | ntfs_error(sb, "Failed to read $MFTMirr."); | |
1067 | goto mft_unmap_out; | |
1068 | } | |
1069 | kmirr = page_address(mirr_page); | |
1070 | ++index; | |
1071 | } | |
1072 | /* Make sure the record is ok. */ | |
1073 | if (ntfs_is_baad_recordp((le32*)kmft)) { | |
1074 | ntfs_error(sb, "Incomplete multi sector transfer " | |
1075 | "detected in mft record %i.", i); | |
1076 | mm_unmap_out: | |
1077 | ntfs_unmap_page(mirr_page); | |
1078 | mft_unmap_out: | |
1079 | ntfs_unmap_page(mft_page); | |
1080 | return FALSE; | |
1081 | } | |
1082 | if (ntfs_is_baad_recordp((le32*)kmirr)) { | |
1083 | ntfs_error(sb, "Incomplete multi sector transfer " | |
1084 | "detected in mft mirror record %i.", i); | |
1085 | goto mm_unmap_out; | |
1086 | } | |
1087 | /* Get the amount of data in the current record. */ | |
1088 | bytes = le32_to_cpu(((MFT_RECORD*)kmft)->bytes_in_use); | |
1089 | if (!bytes || bytes > vol->mft_record_size) { | |
1090 | bytes = le32_to_cpu(((MFT_RECORD*)kmirr)->bytes_in_use); | |
1091 | if (!bytes || bytes > vol->mft_record_size) | |
1092 | bytes = vol->mft_record_size; | |
1093 | } | |
1094 | /* Compare the two records. */ | |
1095 | if (memcmp(kmft, kmirr, bytes)) { | |
1096 | ntfs_error(sb, "$MFT and $MFTMirr (record %i) do not " | |
1097 | "match. Run ntfsfix or chkdsk.", i); | |
1098 | goto mm_unmap_out; | |
1099 | } | |
1100 | kmft += vol->mft_record_size; | |
1101 | kmirr += vol->mft_record_size; | |
1102 | } while (++i < vol->mftmirr_size); | |
1103 | /* Release the last pages. */ | |
1104 | ntfs_unmap_page(mft_page); | |
1105 | ntfs_unmap_page(mirr_page); | |
1106 | ||
1107 | /* Construct the mft mirror runlist by hand. */ | |
1108 | rl2[0].vcn = 0; | |
1109 | rl2[0].lcn = vol->mftmirr_lcn; | |
1110 | rl2[0].length = (vol->mftmirr_size * vol->mft_record_size + | |
1111 | vol->cluster_size - 1) / vol->cluster_size; | |
1112 | rl2[1].vcn = rl2[0].length; | |
1113 | rl2[1].lcn = LCN_ENOENT; | |
1114 | rl2[1].length = 0; | |
1115 | /* | |
1116 | * Because we have just read all of the mft mirror, we know we have | |
1117 | * mapped the full runlist for it. | |
1118 | */ | |
1119 | mirr_ni = NTFS_I(vol->mftmirr_ino); | |
1120 | down_read(&mirr_ni->runlist.lock); | |
1121 | rl = mirr_ni->runlist.rl; | |
1122 | /* Compare the two runlists. They must be identical. */ | |
1123 | i = 0; | |
1124 | do { | |
1125 | if (rl2[i].vcn != rl[i].vcn || rl2[i].lcn != rl[i].lcn || | |
1126 | rl2[i].length != rl[i].length) { | |
1127 | ntfs_error(sb, "$MFTMirr location mismatch. " | |
1128 | "Run chkdsk."); | |
1129 | up_read(&mirr_ni->runlist.lock); | |
1130 | return FALSE; | |
1131 | } | |
1132 | } while (rl2[i++].length); | |
1133 | up_read(&mirr_ni->runlist.lock); | |
1134 | ntfs_debug("Done."); | |
1135 | return TRUE; | |
1136 | } | |
1137 | ||
1138 | /** | |
1139 | * load_and_check_logfile - load and check the logfile inode for a volume | |
1140 | * @vol: ntfs super block describing device whose logfile to load | |
1141 | * | |
1142 | * Return TRUE on success or FALSE on error. | |
1143 | */ | |
e7a1033b AA |
1144 | static BOOL load_and_check_logfile(ntfs_volume *vol, |
1145 | RESTART_PAGE_HEADER **rp) | |
1da177e4 LT |
1146 | { |
1147 | struct inode *tmp_ino; | |
1148 | ||
1149 | ntfs_debug("Entering."); | |
1150 | tmp_ino = ntfs_iget(vol->sb, FILE_LogFile); | |
1151 | if (IS_ERR(tmp_ino) || is_bad_inode(tmp_ino)) { | |
1152 | if (!IS_ERR(tmp_ino)) | |
1153 | iput(tmp_ino); | |
1154 | /* Caller will display error message. */ | |
1155 | return FALSE; | |
1156 | } | |
e7a1033b | 1157 | if (!ntfs_check_logfile(tmp_ino, rp)) { |
1da177e4 LT |
1158 | iput(tmp_ino); |
1159 | /* ntfs_check_logfile() will have displayed error output. */ | |
1160 | return FALSE; | |
1161 | } | |
c002f425 | 1162 | NInoSetSparseDisabled(NTFS_I(tmp_ino)); |
1da177e4 LT |
1163 | vol->logfile_ino = tmp_ino; |
1164 | ntfs_debug("Done."); | |
1165 | return TRUE; | |
1166 | } | |
1167 | ||
ca8fd7a0 AA |
1168 | #define NTFS_HIBERFIL_HEADER_SIZE 4096 |
1169 | ||
1170 | /** | |
1171 | * check_windows_hibernation_status - check if Windows is suspended on a volume | |
1172 | * @vol: ntfs super block of device to check | |
1173 | * | |
1174 | * Check if Windows is hibernated on the ntfs volume @vol. This is done by | |
1175 | * looking for the file hiberfil.sys in the root directory of the volume. If | |
1176 | * the file is not present Windows is definitely not suspended. | |
1177 | * | |
1178 | * If hiberfil.sys exists and is less than 4kiB in size it means Windows is | |
1179 | * definitely suspended (this volume is not the system volume). Caveat: on a | |
1180 | * system with many volumes it is possible that the < 4kiB check is bogus but | |
1181 | * for now this should do fine. | |
1182 | * | |
1183 | * If hiberfil.sys exists and is larger than 4kiB in size, we need to read the | |
1184 | * hiberfil header (which is the first 4kiB). If this begins with "hibr", | |
1185 | * Windows is definitely suspended. If it is completely full of zeroes, | |
1186 | * Windows is definitely not hibernated. Any other case is treated as if | |
1187 | * Windows is suspended. This caters for the above mentioned caveat of a | |
1188 | * system with many volumes where no "hibr" magic would be present and there is | |
1189 | * no zero header. | |
1190 | * | |
1191 | * Return 0 if Windows is not hibernated on the volume, >0 if Windows is | |
1192 | * hibernated on the volume, and -errno on error. | |
1193 | */ | |
1194 | static int check_windows_hibernation_status(ntfs_volume *vol) | |
1195 | { | |
1196 | MFT_REF mref; | |
1197 | struct inode *vi; | |
1198 | ntfs_inode *ni; | |
1199 | struct page *page; | |
1200 | u32 *kaddr, *kend; | |
1201 | ntfs_name *name = NULL; | |
1202 | int ret = 1; | |
1203 | static const ntfschar hiberfil[13] = { const_cpu_to_le16('h'), | |
1204 | const_cpu_to_le16('i'), const_cpu_to_le16('b'), | |
1205 | const_cpu_to_le16('e'), const_cpu_to_le16('r'), | |
1206 | const_cpu_to_le16('f'), const_cpu_to_le16('i'), | |
1207 | const_cpu_to_le16('l'), const_cpu_to_le16('.'), | |
1208 | const_cpu_to_le16('s'), const_cpu_to_le16('y'), | |
1209 | const_cpu_to_le16('s'), 0 }; | |
1210 | ||
1211 | ntfs_debug("Entering."); | |
1212 | /* | |
1213 | * Find the inode number for the hibernation file by looking up the | |
1214 | * filename hiberfil.sys in the root directory. | |
1215 | */ | |
1b1dcc1b | 1216 | mutex_lock(&vol->root_ino->i_mutex); |
ca8fd7a0 AA |
1217 | mref = ntfs_lookup_inode_by_name(NTFS_I(vol->root_ino), hiberfil, 12, |
1218 | &name); | |
1b1dcc1b | 1219 | mutex_unlock(&vol->root_ino->i_mutex); |
ca8fd7a0 AA |
1220 | if (IS_ERR_MREF(mref)) { |
1221 | ret = MREF_ERR(mref); | |
1222 | /* If the file does not exist, Windows is not hibernated. */ | |
1223 | if (ret == -ENOENT) { | |
1224 | ntfs_debug("hiberfil.sys not present. Windows is not " | |
1225 | "hibernated on the volume."); | |
1226 | return 0; | |
1227 | } | |
1228 | /* A real error occured. */ | |
1229 | ntfs_error(vol->sb, "Failed to find inode number for " | |
1230 | "hiberfil.sys."); | |
1231 | return ret; | |
1232 | } | |
1233 | /* We do not care for the type of match that was found. */ | |
1234 | kfree(name); | |
1235 | /* Get the inode. */ | |
1236 | vi = ntfs_iget(vol->sb, MREF(mref)); | |
1237 | if (IS_ERR(vi) || is_bad_inode(vi)) { | |
1238 | if (!IS_ERR(vi)) | |
1239 | iput(vi); | |
1240 | ntfs_error(vol->sb, "Failed to load hiberfil.sys."); | |
1241 | return IS_ERR(vi) ? PTR_ERR(vi) : -EIO; | |
1242 | } | |
1243 | if (unlikely(i_size_read(vi) < NTFS_HIBERFIL_HEADER_SIZE)) { | |
1244 | ntfs_debug("hiberfil.sys is smaller than 4kiB (0x%llx). " | |
1245 | "Windows is hibernated on the volume. This " | |
1246 | "is not the system volume.", i_size_read(vi)); | |
1247 | goto iput_out; | |
1248 | } | |
1249 | ni = NTFS_I(vi); | |
1250 | page = ntfs_map_page(vi->i_mapping, 0); | |
1251 | if (IS_ERR(page)) { | |
1252 | ntfs_error(vol->sb, "Failed to read from hiberfil.sys."); | |
1253 | ret = PTR_ERR(page); | |
1254 | goto iput_out; | |
1255 | } | |
1256 | kaddr = (u32*)page_address(page); | |
1257 | if (*(le32*)kaddr == const_cpu_to_le32(0x72626968)/*'hibr'*/) { | |
1258 | ntfs_debug("Magic \"hibr\" found in hiberfil.sys. Windows is " | |
1259 | "hibernated on the volume. This is the " | |
1260 | "system volume."); | |
1261 | goto unm_iput_out; | |
1262 | } | |
1263 | kend = kaddr + NTFS_HIBERFIL_HEADER_SIZE/sizeof(*kaddr); | |
1264 | do { | |
1265 | if (unlikely(*kaddr)) { | |
1266 | ntfs_debug("hiberfil.sys is larger than 4kiB " | |
1267 | "(0x%llx), does not contain the " | |
1268 | "\"hibr\" magic, and does not have a " | |
1269 | "zero header. Windows is hibernated " | |
1270 | "on the volume. This is not the " | |
1271 | "system volume.", i_size_read(vi)); | |
1272 | goto unm_iput_out; | |
1273 | } | |
1274 | } while (++kaddr < kend); | |
1275 | ntfs_debug("hiberfil.sys contains a zero header. Windows is not " | |
1276 | "hibernated on the volume. This is the system " | |
1277 | "volume."); | |
1278 | ret = 0; | |
1279 | unm_iput_out: | |
1280 | ntfs_unmap_page(page); | |
1281 | iput_out: | |
1282 | iput(vi); | |
1283 | return ret; | |
1284 | } | |
1285 | ||
1da177e4 LT |
1286 | /** |
1287 | * load_and_init_quota - load and setup the quota file for a volume if present | |
1288 | * @vol: ntfs super block describing device whose quota file to load | |
1289 | * | |
1290 | * Return TRUE on success or FALSE on error. If $Quota is not present, we | |
1291 | * leave vol->quota_ino as NULL and return success. | |
1292 | */ | |
1293 | static BOOL load_and_init_quota(ntfs_volume *vol) | |
1294 | { | |
1295 | MFT_REF mref; | |
1296 | struct inode *tmp_ino; | |
1297 | ntfs_name *name = NULL; | |
1298 | static const ntfschar Quota[7] = { const_cpu_to_le16('$'), | |
1299 | const_cpu_to_le16('Q'), const_cpu_to_le16('u'), | |
1300 | const_cpu_to_le16('o'), const_cpu_to_le16('t'), | |
1301 | const_cpu_to_le16('a'), 0 }; | |
1302 | static ntfschar Q[3] = { const_cpu_to_le16('$'), | |
1303 | const_cpu_to_le16('Q'), 0 }; | |
1304 | ||
1305 | ntfs_debug("Entering."); | |
1306 | /* | |
1307 | * Find the inode number for the quota file by looking up the filename | |
1308 | * $Quota in the extended system files directory $Extend. | |
1309 | */ | |
1b1dcc1b | 1310 | mutex_lock(&vol->extend_ino->i_mutex); |
1da177e4 LT |
1311 | mref = ntfs_lookup_inode_by_name(NTFS_I(vol->extend_ino), Quota, 6, |
1312 | &name); | |
1b1dcc1b | 1313 | mutex_unlock(&vol->extend_ino->i_mutex); |
1da177e4 LT |
1314 | if (IS_ERR_MREF(mref)) { |
1315 | /* | |
1316 | * If the file does not exist, quotas are disabled and have | |
1317 | * never been enabled on this volume, just return success. | |
1318 | */ | |
1319 | if (MREF_ERR(mref) == -ENOENT) { | |
1320 | ntfs_debug("$Quota not present. Volume does not have " | |
1321 | "quotas enabled."); | |
1322 | /* | |
1323 | * No need to try to set quotas out of date if they are | |
1324 | * not enabled. | |
1325 | */ | |
1326 | NVolSetQuotaOutOfDate(vol); | |
1327 | return TRUE; | |
1328 | } | |
1329 | /* A real error occured. */ | |
1330 | ntfs_error(vol->sb, "Failed to find inode number for $Quota."); | |
1331 | return FALSE; | |
1332 | } | |
1333 | /* We do not care for the type of match that was found. */ | |
251c8427 | 1334 | kfree(name); |
1da177e4 LT |
1335 | /* Get the inode. */ |
1336 | tmp_ino = ntfs_iget(vol->sb, MREF(mref)); | |
1337 | if (IS_ERR(tmp_ino) || is_bad_inode(tmp_ino)) { | |
1338 | if (!IS_ERR(tmp_ino)) | |
1339 | iput(tmp_ino); | |
1340 | ntfs_error(vol->sb, "Failed to load $Quota."); | |
1341 | return FALSE; | |
1342 | } | |
1343 | vol->quota_ino = tmp_ino; | |
1344 | /* Get the $Q index allocation attribute. */ | |
1345 | tmp_ino = ntfs_index_iget(vol->quota_ino, Q, 2); | |
1346 | if (IS_ERR(tmp_ino)) { | |
1347 | ntfs_error(vol->sb, "Failed to load $Quota/$Q index."); | |
1348 | return FALSE; | |
1349 | } | |
1350 | vol->quota_q_ino = tmp_ino; | |
1351 | ntfs_debug("Done."); | |
1352 | return TRUE; | |
1353 | } | |
1354 | ||
3f2faef0 AA |
1355 | /** |
1356 | * load_and_init_usnjrnl - load and setup the transaction log if present | |
1357 | * @vol: ntfs super block describing device whose usnjrnl file to load | |
1358 | * | |
1359 | * Return TRUE on success or FALSE on error. | |
1360 | * | |
1361 | * If $UsnJrnl is not present or in the process of being disabled, we set | |
1362 | * NVolUsnJrnlStamped() and return success. | |
1363 | * | |
1364 | * If the $UsnJrnl $DATA/$J attribute has a size equal to the lowest valid usn, | |
1365 | * i.e. transaction logging has only just been enabled or the journal has been | |
1366 | * stamped and nothing has been logged since, we also set NVolUsnJrnlStamped() | |
1367 | * and return success. | |
1368 | */ | |
1369 | static BOOL load_and_init_usnjrnl(ntfs_volume *vol) | |
1370 | { | |
1371 | MFT_REF mref; | |
1372 | struct inode *tmp_ino; | |
1373 | ntfs_inode *tmp_ni; | |
1374 | struct page *page; | |
1375 | ntfs_name *name = NULL; | |
1376 | USN_HEADER *uh; | |
1377 | static const ntfschar UsnJrnl[9] = { const_cpu_to_le16('$'), | |
1378 | const_cpu_to_le16('U'), const_cpu_to_le16('s'), | |
1379 | const_cpu_to_le16('n'), const_cpu_to_le16('J'), | |
1380 | const_cpu_to_le16('r'), const_cpu_to_le16('n'), | |
1381 | const_cpu_to_le16('l'), 0 }; | |
1382 | static ntfschar Max[5] = { const_cpu_to_le16('$'), | |
1383 | const_cpu_to_le16('M'), const_cpu_to_le16('a'), | |
1384 | const_cpu_to_le16('x'), 0 }; | |
1385 | static ntfschar J[3] = { const_cpu_to_le16('$'), | |
1386 | const_cpu_to_le16('J'), 0 }; | |
1387 | ||
1388 | ntfs_debug("Entering."); | |
1389 | /* | |
1390 | * Find the inode number for the transaction log file by looking up the | |
1391 | * filename $UsnJrnl in the extended system files directory $Extend. | |
1392 | */ | |
1b1dcc1b | 1393 | mutex_lock(&vol->extend_ino->i_mutex); |
3f2faef0 AA |
1394 | mref = ntfs_lookup_inode_by_name(NTFS_I(vol->extend_ino), UsnJrnl, 8, |
1395 | &name); | |
1b1dcc1b | 1396 | mutex_unlock(&vol->extend_ino->i_mutex); |
3f2faef0 AA |
1397 | if (IS_ERR_MREF(mref)) { |
1398 | /* | |
1399 | * If the file does not exist, transaction logging is disabled, | |
1400 | * just return success. | |
1401 | */ | |
1402 | if (MREF_ERR(mref) == -ENOENT) { | |
1403 | ntfs_debug("$UsnJrnl not present. Volume does not " | |
1404 | "have transaction logging enabled."); | |
1405 | not_enabled: | |
1406 | /* | |
1407 | * No need to try to stamp the transaction log if | |
1408 | * transaction logging is not enabled. | |
1409 | */ | |
1410 | NVolSetUsnJrnlStamped(vol); | |
1411 | return TRUE; | |
1412 | } | |
1413 | /* A real error occured. */ | |
1414 | ntfs_error(vol->sb, "Failed to find inode number for " | |
1415 | "$UsnJrnl."); | |
1416 | return FALSE; | |
1417 | } | |
1418 | /* We do not care for the type of match that was found. */ | |
1419 | kfree(name); | |
1420 | /* Get the inode. */ | |
1421 | tmp_ino = ntfs_iget(vol->sb, MREF(mref)); | |
1422 | if (unlikely(IS_ERR(tmp_ino) || is_bad_inode(tmp_ino))) { | |
1423 | if (!IS_ERR(tmp_ino)) | |
1424 | iput(tmp_ino); | |
1425 | ntfs_error(vol->sb, "Failed to load $UsnJrnl."); | |
1426 | return FALSE; | |
1427 | } | |
1428 | vol->usnjrnl_ino = tmp_ino; | |
1429 | /* | |
1430 | * If the transaction log is in the process of being deleted, we can | |
1431 | * ignore it. | |
1432 | */ | |
1433 | if (unlikely(vol->vol_flags & VOLUME_DELETE_USN_UNDERWAY)) { | |
1434 | ntfs_debug("$UsnJrnl in the process of being disabled. " | |
1435 | "Volume does not have transaction logging " | |
1436 | "enabled."); | |
1437 | goto not_enabled; | |
1438 | } | |
1439 | /* Get the $DATA/$Max attribute. */ | |
1440 | tmp_ino = ntfs_attr_iget(vol->usnjrnl_ino, AT_DATA, Max, 4); | |
1441 | if (IS_ERR(tmp_ino)) { | |
1442 | ntfs_error(vol->sb, "Failed to load $UsnJrnl/$DATA/$Max " | |
1443 | "attribute."); | |
1444 | return FALSE; | |
1445 | } | |
1446 | vol->usnjrnl_max_ino = tmp_ino; | |
1447 | if (unlikely(i_size_read(tmp_ino) < sizeof(USN_HEADER))) { | |
1448 | ntfs_error(vol->sb, "Found corrupt $UsnJrnl/$DATA/$Max " | |
1449 | "attribute (size is 0x%llx but should be at " | |
d04bd1fb | 1450 | "least 0x%zx bytes).", i_size_read(tmp_ino), |
3f2faef0 AA |
1451 | sizeof(USN_HEADER)); |
1452 | return FALSE; | |
1453 | } | |
1454 | /* Get the $DATA/$J attribute. */ | |
1455 | tmp_ino = ntfs_attr_iget(vol->usnjrnl_ino, AT_DATA, J, 2); | |
1456 | if (IS_ERR(tmp_ino)) { | |
1457 | ntfs_error(vol->sb, "Failed to load $UsnJrnl/$DATA/$J " | |
1458 | "attribute."); | |
1459 | return FALSE; | |
1460 | } | |
1461 | vol->usnjrnl_j_ino = tmp_ino; | |
1462 | /* Verify $J is non-resident and sparse. */ | |
1463 | tmp_ni = NTFS_I(vol->usnjrnl_j_ino); | |
1464 | if (unlikely(!NInoNonResident(tmp_ni) || !NInoSparse(tmp_ni))) { | |
1465 | ntfs_error(vol->sb, "$UsnJrnl/$DATA/$J attribute is resident " | |
1466 | "and/or not sparse."); | |
1467 | return FALSE; | |
1468 | } | |
1469 | /* Read the USN_HEADER from $DATA/$Max. */ | |
1470 | page = ntfs_map_page(vol->usnjrnl_max_ino->i_mapping, 0); | |
1471 | if (IS_ERR(page)) { | |
1472 | ntfs_error(vol->sb, "Failed to read from $UsnJrnl/$DATA/$Max " | |
1473 | "attribute."); | |
1474 | return FALSE; | |
1475 | } | |
1476 | uh = (USN_HEADER*)page_address(page); | |
1477 | /* Sanity check the $Max. */ | |
1478 | if (unlikely(sle64_to_cpu(uh->allocation_delta) > | |
1479 | sle64_to_cpu(uh->maximum_size))) { | |
1480 | ntfs_error(vol->sb, "Allocation delta (0x%llx) exceeds " | |
1481 | "maximum size (0x%llx). $UsnJrnl is corrupt.", | |
1482 | (long long)sle64_to_cpu(uh->allocation_delta), | |
1483 | (long long)sle64_to_cpu(uh->maximum_size)); | |
1484 | ntfs_unmap_page(page); | |
1485 | return FALSE; | |
1486 | } | |
1487 | /* | |
1488 | * If the transaction log has been stamped and nothing has been written | |
1489 | * to it since, we do not need to stamp it. | |
1490 | */ | |
1491 | if (unlikely(sle64_to_cpu(uh->lowest_valid_usn) >= | |
1492 | i_size_read(vol->usnjrnl_j_ino))) { | |
1493 | if (likely(sle64_to_cpu(uh->lowest_valid_usn) == | |
1494 | i_size_read(vol->usnjrnl_j_ino))) { | |
1495 | ntfs_unmap_page(page); | |
1496 | ntfs_debug("$UsnJrnl is enabled but nothing has been " | |
1497 | "logged since it was last stamped. " | |
1498 | "Treating this as if the volume does " | |
1499 | "not have transaction logging " | |
1500 | "enabled."); | |
1501 | goto not_enabled; | |
1502 | } | |
1503 | ntfs_error(vol->sb, "$UsnJrnl has lowest valid usn (0x%llx) " | |
1504 | "which is out of bounds (0x%llx). $UsnJrnl " | |
1505 | "is corrupt.", | |
1506 | (long long)sle64_to_cpu(uh->lowest_valid_usn), | |
1507 | i_size_read(vol->usnjrnl_j_ino)); | |
1508 | ntfs_unmap_page(page); | |
1509 | return FALSE; | |
1510 | } | |
1511 | ntfs_unmap_page(page); | |
1512 | ntfs_debug("Done."); | |
1513 | return TRUE; | |
1514 | } | |
1515 | ||
1da177e4 LT |
1516 | /** |
1517 | * load_and_init_attrdef - load the attribute definitions table for a volume | |
1518 | * @vol: ntfs super block describing device whose attrdef to load | |
1519 | * | |
1520 | * Return TRUE on success or FALSE on error. | |
1521 | */ | |
1522 | static BOOL load_and_init_attrdef(ntfs_volume *vol) | |
1523 | { | |
218357ff | 1524 | loff_t i_size; |
1da177e4 LT |
1525 | struct super_block *sb = vol->sb; |
1526 | struct inode *ino; | |
1527 | struct page *page; | |
218357ff | 1528 | pgoff_t index, max_index; |
1da177e4 LT |
1529 | unsigned int size; |
1530 | ||
1531 | ntfs_debug("Entering."); | |
1532 | /* Read attrdef table and setup vol->attrdef and vol->attrdef_size. */ | |
1533 | ino = ntfs_iget(sb, FILE_AttrDef); | |
1534 | if (IS_ERR(ino) || is_bad_inode(ino)) { | |
1535 | if (!IS_ERR(ino)) | |
1536 | iput(ino); | |
1537 | goto failed; | |
1538 | } | |
c002f425 | 1539 | NInoSetSparseDisabled(NTFS_I(ino)); |
1da177e4 | 1540 | /* The size of FILE_AttrDef must be above 0 and fit inside 31 bits. */ |
218357ff AA |
1541 | i_size = i_size_read(ino); |
1542 | if (i_size <= 0 || i_size > 0x7fffffff) | |
1da177e4 | 1543 | goto iput_failed; |
218357ff | 1544 | vol->attrdef = (ATTR_DEF*)ntfs_malloc_nofs(i_size); |
1da177e4 LT |
1545 | if (!vol->attrdef) |
1546 | goto iput_failed; | |
1547 | index = 0; | |
218357ff | 1548 | max_index = i_size >> PAGE_CACHE_SHIFT; |
1da177e4 LT |
1549 | size = PAGE_CACHE_SIZE; |
1550 | while (index < max_index) { | |
1551 | /* Read the attrdef table and copy it into the linear buffer. */ | |
1552 | read_partial_attrdef_page: | |
1553 | page = ntfs_map_page(ino->i_mapping, index); | |
1554 | if (IS_ERR(page)) | |
1555 | goto free_iput_failed; | |
1556 | memcpy((u8*)vol->attrdef + (index++ << PAGE_CACHE_SHIFT), | |
1557 | page_address(page), size); | |
1558 | ntfs_unmap_page(page); | |
1559 | }; | |
1560 | if (size == PAGE_CACHE_SIZE) { | |
218357ff | 1561 | size = i_size & ~PAGE_CACHE_MASK; |
1da177e4 LT |
1562 | if (size) |
1563 | goto read_partial_attrdef_page; | |
1564 | } | |
218357ff AA |
1565 | vol->attrdef_size = i_size; |
1566 | ntfs_debug("Read %llu bytes from $AttrDef.", i_size); | |
1da177e4 LT |
1567 | iput(ino); |
1568 | return TRUE; | |
1569 | free_iput_failed: | |
1570 | ntfs_free(vol->attrdef); | |
1571 | vol->attrdef = NULL; | |
1572 | iput_failed: | |
1573 | iput(ino); | |
1574 | failed: | |
1575 | ntfs_error(sb, "Failed to initialize attribute definition table."); | |
1576 | return FALSE; | |
1577 | } | |
1578 | ||
1579 | #endif /* NTFS_RW */ | |
1580 | ||
1581 | /** | |
1582 | * load_and_init_upcase - load the upcase table for an ntfs volume | |
1583 | * @vol: ntfs super block describing device whose upcase to load | |
1584 | * | |
1585 | * Return TRUE on success or FALSE on error. | |
1586 | */ | |
1587 | static BOOL load_and_init_upcase(ntfs_volume *vol) | |
1588 | { | |
218357ff | 1589 | loff_t i_size; |
1da177e4 LT |
1590 | struct super_block *sb = vol->sb; |
1591 | struct inode *ino; | |
1592 | struct page *page; | |
218357ff | 1593 | pgoff_t index, max_index; |
1da177e4 LT |
1594 | unsigned int size; |
1595 | int i, max; | |
1596 | ||
1597 | ntfs_debug("Entering."); | |
1598 | /* Read upcase table and setup vol->upcase and vol->upcase_len. */ | |
1599 | ino = ntfs_iget(sb, FILE_UpCase); | |
1600 | if (IS_ERR(ino) || is_bad_inode(ino)) { | |
1601 | if (!IS_ERR(ino)) | |
1602 | iput(ino); | |
1603 | goto upcase_failed; | |
1604 | } | |
1605 | /* | |
1606 | * The upcase size must not be above 64k Unicode characters, must not | |
1607 | * be zero and must be a multiple of sizeof(ntfschar). | |
1608 | */ | |
218357ff AA |
1609 | i_size = i_size_read(ino); |
1610 | if (!i_size || i_size & (sizeof(ntfschar) - 1) || | |
1611 | i_size > 64ULL * 1024 * sizeof(ntfschar)) | |
1da177e4 | 1612 | goto iput_upcase_failed; |
218357ff | 1613 | vol->upcase = (ntfschar*)ntfs_malloc_nofs(i_size); |
1da177e4 LT |
1614 | if (!vol->upcase) |
1615 | goto iput_upcase_failed; | |
1616 | index = 0; | |
218357ff | 1617 | max_index = i_size >> PAGE_CACHE_SHIFT; |
1da177e4 LT |
1618 | size = PAGE_CACHE_SIZE; |
1619 | while (index < max_index) { | |
1620 | /* Read the upcase table and copy it into the linear buffer. */ | |
1621 | read_partial_upcase_page: | |
1622 | page = ntfs_map_page(ino->i_mapping, index); | |
1623 | if (IS_ERR(page)) | |
1624 | goto iput_upcase_failed; | |
1625 | memcpy((char*)vol->upcase + (index++ << PAGE_CACHE_SHIFT), | |
1626 | page_address(page), size); | |
1627 | ntfs_unmap_page(page); | |
1628 | }; | |
1629 | if (size == PAGE_CACHE_SIZE) { | |
218357ff | 1630 | size = i_size & ~PAGE_CACHE_MASK; |
1da177e4 LT |
1631 | if (size) |
1632 | goto read_partial_upcase_page; | |
1633 | } | |
218357ff | 1634 | vol->upcase_len = i_size >> UCHAR_T_SIZE_BITS; |
1da177e4 | 1635 | ntfs_debug("Read %llu bytes from $UpCase (expected %zu bytes).", |
218357ff | 1636 | i_size, 64 * 1024 * sizeof(ntfschar)); |
1da177e4 LT |
1637 | iput(ino); |
1638 | down(&ntfs_lock); | |
1639 | if (!default_upcase) { | |
1640 | ntfs_debug("Using volume specified $UpCase since default is " | |
1641 | "not present."); | |
1642 | up(&ntfs_lock); | |
1643 | return TRUE; | |
1644 | } | |
1645 | max = default_upcase_len; | |
1646 | if (max > vol->upcase_len) | |
1647 | max = vol->upcase_len; | |
1648 | for (i = 0; i < max; i++) | |
1649 | if (vol->upcase[i] != default_upcase[i]) | |
1650 | break; | |
1651 | if (i == max) { | |
1652 | ntfs_free(vol->upcase); | |
1653 | vol->upcase = default_upcase; | |
1654 | vol->upcase_len = max; | |
1655 | ntfs_nr_upcase_users++; | |
1656 | up(&ntfs_lock); | |
1657 | ntfs_debug("Volume specified $UpCase matches default. Using " | |
1658 | "default."); | |
1659 | return TRUE; | |
1660 | } | |
1661 | up(&ntfs_lock); | |
1662 | ntfs_debug("Using volume specified $UpCase since it does not match " | |
1663 | "the default."); | |
1664 | return TRUE; | |
1665 | iput_upcase_failed: | |
1666 | iput(ino); | |
1667 | ntfs_free(vol->upcase); | |
1668 | vol->upcase = NULL; | |
1669 | upcase_failed: | |
1670 | down(&ntfs_lock); | |
1671 | if (default_upcase) { | |
1672 | vol->upcase = default_upcase; | |
1673 | vol->upcase_len = default_upcase_len; | |
1674 | ntfs_nr_upcase_users++; | |
1675 | up(&ntfs_lock); | |
1676 | ntfs_error(sb, "Failed to load $UpCase from the volume. Using " | |
1677 | "default."); | |
1678 | return TRUE; | |
1679 | } | |
1680 | up(&ntfs_lock); | |
1681 | ntfs_error(sb, "Failed to initialize upcase table."); | |
1682 | return FALSE; | |
1683 | } | |
1684 | ||
1685 | /** | |
1686 | * load_system_files - open the system files using normal functions | |
1687 | * @vol: ntfs super block describing device whose system files to load | |
1688 | * | |
1689 | * Open the system files with normal access functions and complete setting up | |
1690 | * the ntfs super block @vol. | |
1691 | * | |
1692 | * Return TRUE on success or FALSE on error. | |
1693 | */ | |
1694 | static BOOL load_system_files(ntfs_volume *vol) | |
1695 | { | |
1696 | struct super_block *sb = vol->sb; | |
1697 | MFT_RECORD *m; | |
1698 | VOLUME_INFORMATION *vi; | |
1699 | ntfs_attr_search_ctx *ctx; | |
ca8fd7a0 | 1700 | #ifdef NTFS_RW |
7d333d6c | 1701 | RESTART_PAGE_HEADER *rp; |
ca8fd7a0 AA |
1702 | int err; |
1703 | #endif /* NTFS_RW */ | |
1da177e4 LT |
1704 | |
1705 | ntfs_debug("Entering."); | |
1706 | #ifdef NTFS_RW | |
1707 | /* Get mft mirror inode compare the contents of $MFT and $MFTMirr. */ | |
1708 | if (!load_and_init_mft_mirror(vol) || !check_mft_mirror(vol)) { | |
1709 | static const char *es1 = "Failed to load $MFTMirr"; | |
1710 | static const char *es2 = "$MFTMirr does not match $MFT"; | |
1711 | static const char *es3 = ". Run ntfsfix and/or chkdsk."; | |
1712 | ||
1713 | /* If a read-write mount, convert it to a read-only mount. */ | |
1714 | if (!(sb->s_flags & MS_RDONLY)) { | |
1715 | if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | | |
1716 | ON_ERRORS_CONTINUE))) { | |
1717 | ntfs_error(sb, "%s and neither on_errors=" | |
1718 | "continue nor on_errors=" | |
1719 | "remount-ro was specified%s", | |
1720 | !vol->mftmirr_ino ? es1 : es2, | |
1721 | es3); | |
1722 | goto iput_mirr_err_out; | |
1723 | } | |
24a44dca | 1724 | sb->s_flags |= MS_RDONLY; |
1da177e4 LT |
1725 | ntfs_error(sb, "%s. Mounting read-only%s", |
1726 | !vol->mftmirr_ino ? es1 : es2, es3); | |
1727 | } else | |
1728 | ntfs_warning(sb, "%s. Will not be able to remount " | |
1729 | "read-write%s", | |
1730 | !vol->mftmirr_ino ? es1 : es2, es3); | |
1731 | /* This will prevent a read-write remount. */ | |
1732 | NVolSetErrors(vol); | |
1733 | } | |
1734 | #endif /* NTFS_RW */ | |
1735 | /* Get mft bitmap attribute inode. */ | |
1736 | vol->mftbmp_ino = ntfs_attr_iget(vol->mft_ino, AT_BITMAP, NULL, 0); | |
1737 | if (IS_ERR(vol->mftbmp_ino)) { | |
1738 | ntfs_error(sb, "Failed to load $MFT/$BITMAP attribute."); | |
1739 | goto iput_mirr_err_out; | |
1740 | } | |
1741 | /* Read upcase table and setup @vol->upcase and @vol->upcase_len. */ | |
1742 | if (!load_and_init_upcase(vol)) | |
1743 | goto iput_mftbmp_err_out; | |
1744 | #ifdef NTFS_RW | |
1745 | /* | |
1746 | * Read attribute definitions table and setup @vol->attrdef and | |
1747 | * @vol->attrdef_size. | |
1748 | */ | |
1749 | if (!load_and_init_attrdef(vol)) | |
1750 | goto iput_upcase_err_out; | |
1751 | #endif /* NTFS_RW */ | |
1752 | /* | |
1753 | * Get the cluster allocation bitmap inode and verify the size, no | |
1754 | * need for any locking at this stage as we are already running | |
1755 | * exclusively as we are mount in progress task. | |
1756 | */ | |
1757 | vol->lcnbmp_ino = ntfs_iget(sb, FILE_Bitmap); | |
1758 | if (IS_ERR(vol->lcnbmp_ino) || is_bad_inode(vol->lcnbmp_ino)) { | |
1759 | if (!IS_ERR(vol->lcnbmp_ino)) | |
1760 | iput(vol->lcnbmp_ino); | |
1761 | goto bitmap_failed; | |
1762 | } | |
c002f425 | 1763 | NInoSetSparseDisabled(NTFS_I(vol->lcnbmp_ino)); |
218357ff | 1764 | if ((vol->nr_clusters + 7) >> 3 > i_size_read(vol->lcnbmp_ino)) { |
1da177e4 LT |
1765 | iput(vol->lcnbmp_ino); |
1766 | bitmap_failed: | |
1767 | ntfs_error(sb, "Failed to load $Bitmap."); | |
1768 | goto iput_attrdef_err_out; | |
1769 | } | |
1770 | /* | |
1771 | * Get the volume inode and setup our cache of the volume flags and | |
1772 | * version. | |
1773 | */ | |
1774 | vol->vol_ino = ntfs_iget(sb, FILE_Volume); | |
1775 | if (IS_ERR(vol->vol_ino) || is_bad_inode(vol->vol_ino)) { | |
1776 | if (!IS_ERR(vol->vol_ino)) | |
1777 | iput(vol->vol_ino); | |
1778 | volume_failed: | |
1779 | ntfs_error(sb, "Failed to load $Volume."); | |
1780 | goto iput_lcnbmp_err_out; | |
1781 | } | |
1782 | m = map_mft_record(NTFS_I(vol->vol_ino)); | |
1783 | if (IS_ERR(m)) { | |
1784 | iput_volume_failed: | |
1785 | iput(vol->vol_ino); | |
1786 | goto volume_failed; | |
1787 | } | |
1788 | if (!(ctx = ntfs_attr_get_search_ctx(NTFS_I(vol->vol_ino), m))) { | |
1789 | ntfs_error(sb, "Failed to get attribute search context."); | |
1790 | goto get_ctx_vol_failed; | |
1791 | } | |
1792 | if (ntfs_attr_lookup(AT_VOLUME_INFORMATION, NULL, 0, 0, 0, NULL, 0, | |
1793 | ctx) || ctx->attr->non_resident || ctx->attr->flags) { | |
1794 | err_put_vol: | |
1795 | ntfs_attr_put_search_ctx(ctx); | |
1796 | get_ctx_vol_failed: | |
1797 | unmap_mft_record(NTFS_I(vol->vol_ino)); | |
1798 | goto iput_volume_failed; | |
1799 | } | |
1800 | vi = (VOLUME_INFORMATION*)((char*)ctx->attr + | |
1801 | le16_to_cpu(ctx->attr->data.resident.value_offset)); | |
1802 | /* Some bounds checks. */ | |
1803 | if ((u8*)vi < (u8*)ctx->attr || (u8*)vi + | |
1804 | le32_to_cpu(ctx->attr->data.resident.value_length) > | |
1805 | (u8*)ctx->attr + le32_to_cpu(ctx->attr->length)) | |
1806 | goto err_put_vol; | |
1807 | /* Copy the volume flags and version to the ntfs_volume structure. */ | |
1808 | vol->vol_flags = vi->flags; | |
1809 | vol->major_ver = vi->major_ver; | |
1810 | vol->minor_ver = vi->minor_ver; | |
1811 | ntfs_attr_put_search_ctx(ctx); | |
1812 | unmap_mft_record(NTFS_I(vol->vol_ino)); | |
1813 | printk(KERN_INFO "NTFS volume version %i.%i.\n", vol->major_ver, | |
1814 | vol->minor_ver); | |
c002f425 AA |
1815 | if (vol->major_ver < 3 && NVolSparseEnabled(vol)) { |
1816 | ntfs_warning(vol->sb, "Disabling sparse support due to NTFS " | |
1817 | "volume version %i.%i (need at least version " | |
1818 | "3.0).", vol->major_ver, vol->minor_ver); | |
1819 | NVolClearSparseEnabled(vol); | |
1820 | } | |
1da177e4 LT |
1821 | #ifdef NTFS_RW |
1822 | /* Make sure that no unsupported volume flags are set. */ | |
1823 | if (vol->vol_flags & VOLUME_MUST_MOUNT_RO_MASK) { | |
1824 | static const char *es1a = "Volume is dirty"; | |
1825 | static const char *es1b = "Volume has unsupported flags set"; | |
1826 | static const char *es2 = ". Run chkdsk and mount in Windows."; | |
1827 | const char *es1; | |
1828 | ||
1829 | es1 = vol->vol_flags & VOLUME_IS_DIRTY ? es1a : es1b; | |
1830 | /* If a read-write mount, convert it to a read-only mount. */ | |
1831 | if (!(sb->s_flags & MS_RDONLY)) { | |
1832 | if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | | |
1833 | ON_ERRORS_CONTINUE))) { | |
1834 | ntfs_error(sb, "%s and neither on_errors=" | |
1835 | "continue nor on_errors=" | |
1836 | "remount-ro was specified%s", | |
1837 | es1, es2); | |
1838 | goto iput_vol_err_out; | |
1839 | } | |
24a44dca | 1840 | sb->s_flags |= MS_RDONLY; |
1da177e4 LT |
1841 | ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); |
1842 | } else | |
1843 | ntfs_warning(sb, "%s. Will not be able to remount " | |
1844 | "read-write%s", es1, es2); | |
1845 | /* | |
1846 | * Do not set NVolErrors() because ntfs_remount() re-checks the | |
1847 | * flags which we need to do in case any flags have changed. | |
1848 | */ | |
1849 | } | |
1850 | /* | |
1851 | * Get the inode for the logfile, check it and determine if the volume | |
1852 | * was shutdown cleanly. | |
1853 | */ | |
e7a1033b AA |
1854 | rp = NULL; |
1855 | if (!load_and_check_logfile(vol, &rp) || | |
1856 | !ntfs_is_logfile_clean(vol->logfile_ino, rp)) { | |
1da177e4 LT |
1857 | static const char *es1a = "Failed to load $LogFile"; |
1858 | static const char *es1b = "$LogFile is not clean"; | |
1859 | static const char *es2 = ". Mount in Windows."; | |
1860 | const char *es1; | |
1861 | ||
1862 | es1 = !vol->logfile_ino ? es1a : es1b; | |
1863 | /* If a read-write mount, convert it to a read-only mount. */ | |
1864 | if (!(sb->s_flags & MS_RDONLY)) { | |
1865 | if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | | |
1866 | ON_ERRORS_CONTINUE))) { | |
1867 | ntfs_error(sb, "%s and neither on_errors=" | |
1868 | "continue nor on_errors=" | |
1869 | "remount-ro was specified%s", | |
1870 | es1, es2); | |
e7a1033b AA |
1871 | if (vol->logfile_ino) { |
1872 | BUG_ON(!rp); | |
1873 | ntfs_free(rp); | |
1874 | } | |
1da177e4 LT |
1875 | goto iput_logfile_err_out; |
1876 | } | |
24a44dca | 1877 | sb->s_flags |= MS_RDONLY; |
1da177e4 LT |
1878 | ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); |
1879 | } else | |
1880 | ntfs_warning(sb, "%s. Will not be able to remount " | |
1881 | "read-write%s", es1, es2); | |
1882 | /* This will prevent a read-write remount. */ | |
1883 | NVolSetErrors(vol); | |
1884 | } | |
e7a1033b | 1885 | ntfs_free(rp); |
ca8fd7a0 AA |
1886 | #endif /* NTFS_RW */ |
1887 | /* Get the root directory inode so we can do path lookups. */ | |
1888 | vol->root_ino = ntfs_iget(sb, FILE_root); | |
1889 | if (IS_ERR(vol->root_ino) || is_bad_inode(vol->root_ino)) { | |
1890 | if (!IS_ERR(vol->root_ino)) | |
1891 | iput(vol->root_ino); | |
1892 | ntfs_error(sb, "Failed to load root directory."); | |
1893 | goto iput_logfile_err_out; | |
1894 | } | |
1895 | #ifdef NTFS_RW | |
1896 | /* | |
1897 | * Check if Windows is suspended to disk on the target volume. If it | |
1898 | * is hibernated, we must not write *anything* to the disk so set | |
1899 | * NVolErrors() without setting the dirty volume flag and mount | |
1900 | * read-only. This will prevent read-write remounting and it will also | |
1901 | * prevent all writes. | |
1902 | */ | |
1903 | err = check_windows_hibernation_status(vol); | |
1904 | if (unlikely(err)) { | |
1905 | static const char *es1a = "Failed to determine if Windows is " | |
1906 | "hibernated"; | |
1907 | static const char *es1b = "Windows is hibernated"; | |
1908 | static const char *es2 = ". Run chkdsk."; | |
1909 | const char *es1; | |
1910 | ||
1911 | es1 = err < 0 ? es1a : es1b; | |
1912 | /* If a read-write mount, convert it to a read-only mount. */ | |
1913 | if (!(sb->s_flags & MS_RDONLY)) { | |
1914 | if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | | |
1915 | ON_ERRORS_CONTINUE))) { | |
1916 | ntfs_error(sb, "%s and neither on_errors=" | |
1917 | "continue nor on_errors=" | |
1918 | "remount-ro was specified%s", | |
1919 | es1, es2); | |
1920 | goto iput_root_err_out; | |
1921 | } | |
24a44dca | 1922 | sb->s_flags |= MS_RDONLY; |
ca8fd7a0 AA |
1923 | ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); |
1924 | } else | |
1925 | ntfs_warning(sb, "%s. Will not be able to remount " | |
1926 | "read-write%s", es1, es2); | |
1927 | /* This will prevent a read-write remount. */ | |
1928 | NVolSetErrors(vol); | |
1929 | } | |
1da177e4 LT |
1930 | /* If (still) a read-write mount, mark the volume dirty. */ |
1931 | if (!(sb->s_flags & MS_RDONLY) && | |
1932 | ntfs_set_volume_flags(vol, VOLUME_IS_DIRTY)) { | |
1933 | static const char *es1 = "Failed to set dirty bit in volume " | |
1934 | "information flags"; | |
1935 | static const char *es2 = ". Run chkdsk."; | |
1936 | ||
1937 | /* Convert to a read-only mount. */ | |
1938 | if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | | |
1939 | ON_ERRORS_CONTINUE))) { | |
1940 | ntfs_error(sb, "%s and neither on_errors=continue nor " | |
1941 | "on_errors=remount-ro was specified%s", | |
1942 | es1, es2); | |
ca8fd7a0 | 1943 | goto iput_root_err_out; |
1da177e4 LT |
1944 | } |
1945 | ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); | |
24a44dca | 1946 | sb->s_flags |= MS_RDONLY; |
1da177e4 LT |
1947 | /* |
1948 | * Do not set NVolErrors() because ntfs_remount() might manage | |
1949 | * to set the dirty flag in which case all would be well. | |
1950 | */ | |
1951 | } | |
1952 | #if 0 | |
1953 | // TODO: Enable this code once we start modifying anything that is | |
1954 | // different between NTFS 1.2 and 3.x... | |
1955 | /* | |
1956 | * If (still) a read-write mount, set the NT4 compatibility flag on | |
1957 | * newer NTFS version volumes. | |
1958 | */ | |
1959 | if (!(sb->s_flags & MS_RDONLY) && (vol->major_ver > 1) && | |
1960 | ntfs_set_volume_flags(vol, VOLUME_MOUNTED_ON_NT4)) { | |
1961 | static const char *es1 = "Failed to set NT4 compatibility flag"; | |
1962 | static const char *es2 = ". Run chkdsk."; | |
1963 | ||
1964 | /* Convert to a read-only mount. */ | |
1965 | if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | | |
1966 | ON_ERRORS_CONTINUE))) { | |
1967 | ntfs_error(sb, "%s and neither on_errors=continue nor " | |
1968 | "on_errors=remount-ro was specified%s", | |
1969 | es1, es2); | |
ca8fd7a0 | 1970 | goto iput_root_err_out; |
1da177e4 LT |
1971 | } |
1972 | ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); | |
24a44dca | 1973 | sb->s_flags |= MS_RDONLY; |
1da177e4 LT |
1974 | NVolSetErrors(vol); |
1975 | } | |
1976 | #endif | |
1977 | /* If (still) a read-write mount, empty the logfile. */ | |
1978 | if (!(sb->s_flags & MS_RDONLY) && | |
1979 | !ntfs_empty_logfile(vol->logfile_ino)) { | |
1980 | static const char *es1 = "Failed to empty $LogFile"; | |
1981 | static const char *es2 = ". Mount in Windows."; | |
1982 | ||
1983 | /* Convert to a read-only mount. */ | |
1984 | if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | | |
1985 | ON_ERRORS_CONTINUE))) { | |
1986 | ntfs_error(sb, "%s and neither on_errors=continue nor " | |
1987 | "on_errors=remount-ro was specified%s", | |
1988 | es1, es2); | |
ca8fd7a0 | 1989 | goto iput_root_err_out; |
1da177e4 LT |
1990 | } |
1991 | ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); | |
24a44dca | 1992 | sb->s_flags |= MS_RDONLY; |
1da177e4 LT |
1993 | NVolSetErrors(vol); |
1994 | } | |
1995 | #endif /* NTFS_RW */ | |
1da177e4 | 1996 | /* If on NTFS versions before 3.0, we are done. */ |
3f2faef0 | 1997 | if (unlikely(vol->major_ver < 3)) |
1da177e4 LT |
1998 | return TRUE; |
1999 | /* NTFS 3.0+ specific initialization. */ | |
2000 | /* Get the security descriptors inode. */ | |
2001 | vol->secure_ino = ntfs_iget(sb, FILE_Secure); | |
2002 | if (IS_ERR(vol->secure_ino) || is_bad_inode(vol->secure_ino)) { | |
2003 | if (!IS_ERR(vol->secure_ino)) | |
2004 | iput(vol->secure_ino); | |
2005 | ntfs_error(sb, "Failed to load $Secure."); | |
2006 | goto iput_root_err_out; | |
2007 | } | |
3f2faef0 | 2008 | // TODO: Initialize security. |
1da177e4 LT |
2009 | /* Get the extended system files' directory inode. */ |
2010 | vol->extend_ino = ntfs_iget(sb, FILE_Extend); | |
2011 | if (IS_ERR(vol->extend_ino) || is_bad_inode(vol->extend_ino)) { | |
2012 | if (!IS_ERR(vol->extend_ino)) | |
2013 | iput(vol->extend_ino); | |
2014 | ntfs_error(sb, "Failed to load $Extend."); | |
2015 | goto iput_sec_err_out; | |
2016 | } | |
2017 | #ifdef NTFS_RW | |
2018 | /* Find the quota file, load it if present, and set it up. */ | |
2019 | if (!load_and_init_quota(vol)) { | |
2020 | static const char *es1 = "Failed to load $Quota"; | |
2021 | static const char *es2 = ". Run chkdsk."; | |
2022 | ||
2023 | /* If a read-write mount, convert it to a read-only mount. */ | |
2024 | if (!(sb->s_flags & MS_RDONLY)) { | |
2025 | if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | | |
2026 | ON_ERRORS_CONTINUE))) { | |
2027 | ntfs_error(sb, "%s and neither on_errors=" | |
2028 | "continue nor on_errors=" | |
2029 | "remount-ro was specified%s", | |
2030 | es1, es2); | |
2031 | goto iput_quota_err_out; | |
2032 | } | |
24a44dca | 2033 | sb->s_flags |= MS_RDONLY; |
1da177e4 LT |
2034 | ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); |
2035 | } else | |
2036 | ntfs_warning(sb, "%s. Will not be able to remount " | |
2037 | "read-write%s", es1, es2); | |
2038 | /* This will prevent a read-write remount. */ | |
2039 | NVolSetErrors(vol); | |
2040 | } | |
2041 | /* If (still) a read-write mount, mark the quotas out of date. */ | |
2042 | if (!(sb->s_flags & MS_RDONLY) && | |
2043 | !ntfs_mark_quotas_out_of_date(vol)) { | |
2044 | static const char *es1 = "Failed to mark quotas out of date"; | |
2045 | static const char *es2 = ". Run chkdsk."; | |
2046 | ||
2047 | /* Convert to a read-only mount. */ | |
2048 | if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | | |
2049 | ON_ERRORS_CONTINUE))) { | |
2050 | ntfs_error(sb, "%s and neither on_errors=continue nor " | |
2051 | "on_errors=remount-ro was specified%s", | |
2052 | es1, es2); | |
2053 | goto iput_quota_err_out; | |
2054 | } | |
2055 | ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); | |
24a44dca | 2056 | sb->s_flags |= MS_RDONLY; |
1da177e4 LT |
2057 | NVolSetErrors(vol); |
2058 | } | |
3f2faef0 AA |
2059 | /* |
2060 | * Find the transaction log file ($UsnJrnl), load it if present, check | |
2061 | * it, and set it up. | |
2062 | */ | |
2063 | if (!load_and_init_usnjrnl(vol)) { | |
2064 | static const char *es1 = "Failed to load $UsnJrnl"; | |
2065 | static const char *es2 = ". Run chkdsk."; | |
2066 | ||
2067 | /* If a read-write mount, convert it to a read-only mount. */ | |
2068 | if (!(sb->s_flags & MS_RDONLY)) { | |
2069 | if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | | |
2070 | ON_ERRORS_CONTINUE))) { | |
2071 | ntfs_error(sb, "%s and neither on_errors=" | |
2072 | "continue nor on_errors=" | |
2073 | "remount-ro was specified%s", | |
2074 | es1, es2); | |
2075 | goto iput_usnjrnl_err_out; | |
2076 | } | |
24a44dca | 2077 | sb->s_flags |= MS_RDONLY; |
3f2faef0 AA |
2078 | ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); |
2079 | } else | |
2080 | ntfs_warning(sb, "%s. Will not be able to remount " | |
2081 | "read-write%s", es1, es2); | |
2082 | /* This will prevent a read-write remount. */ | |
2083 | NVolSetErrors(vol); | |
2084 | } | |
2085 | /* If (still) a read-write mount, stamp the transaction log. */ | |
2086 | if (!(sb->s_flags & MS_RDONLY) && !ntfs_stamp_usnjrnl(vol)) { | |
2087 | static const char *es1 = "Failed to stamp transaction log " | |
2088 | "($UsnJrnl)"; | |
2089 | static const char *es2 = ". Run chkdsk."; | |
2090 | ||
2091 | /* Convert to a read-only mount. */ | |
2092 | if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | | |
2093 | ON_ERRORS_CONTINUE))) { | |
2094 | ntfs_error(sb, "%s and neither on_errors=continue nor " | |
2095 | "on_errors=remount-ro was specified%s", | |
2096 | es1, es2); | |
2097 | goto iput_usnjrnl_err_out; | |
2098 | } | |
2099 | ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); | |
24a44dca | 2100 | sb->s_flags |= MS_RDONLY; |
3f2faef0 AA |
2101 | NVolSetErrors(vol); |
2102 | } | |
1da177e4 LT |
2103 | #endif /* NTFS_RW */ |
2104 | return TRUE; | |
2105 | #ifdef NTFS_RW | |
3f2faef0 AA |
2106 | iput_usnjrnl_err_out: |
2107 | if (vol->usnjrnl_j_ino) | |
2108 | iput(vol->usnjrnl_j_ino); | |
2109 | if (vol->usnjrnl_max_ino) | |
2110 | iput(vol->usnjrnl_max_ino); | |
2111 | if (vol->usnjrnl_ino) | |
2112 | iput(vol->usnjrnl_ino); | |
1da177e4 LT |
2113 | iput_quota_err_out: |
2114 | if (vol->quota_q_ino) | |
2115 | iput(vol->quota_q_ino); | |
2116 | if (vol->quota_ino) | |
2117 | iput(vol->quota_ino); | |
2118 | iput(vol->extend_ino); | |
2119 | #endif /* NTFS_RW */ | |
2120 | iput_sec_err_out: | |
2121 | iput(vol->secure_ino); | |
2122 | iput_root_err_out: | |
2123 | iput(vol->root_ino); | |
2124 | iput_logfile_err_out: | |
2125 | #ifdef NTFS_RW | |
2126 | if (vol->logfile_ino) | |
2127 | iput(vol->logfile_ino); | |
2128 | iput_vol_err_out: | |
2129 | #endif /* NTFS_RW */ | |
2130 | iput(vol->vol_ino); | |
2131 | iput_lcnbmp_err_out: | |
2132 | iput(vol->lcnbmp_ino); | |
2133 | iput_attrdef_err_out: | |
2134 | vol->attrdef_size = 0; | |
2135 | if (vol->attrdef) { | |
2136 | ntfs_free(vol->attrdef); | |
2137 | vol->attrdef = NULL; | |
2138 | } | |
2139 | #ifdef NTFS_RW | |
2140 | iput_upcase_err_out: | |
2141 | #endif /* NTFS_RW */ | |
2142 | vol->upcase_len = 0; | |
2143 | down(&ntfs_lock); | |
2144 | if (vol->upcase == default_upcase) { | |
2145 | ntfs_nr_upcase_users--; | |
2146 | vol->upcase = NULL; | |
2147 | } | |
2148 | up(&ntfs_lock); | |
2149 | if (vol->upcase) { | |
2150 | ntfs_free(vol->upcase); | |
2151 | vol->upcase = NULL; | |
2152 | } | |
2153 | iput_mftbmp_err_out: | |
2154 | iput(vol->mftbmp_ino); | |
2155 | iput_mirr_err_out: | |
2156 | #ifdef NTFS_RW | |
2157 | if (vol->mftmirr_ino) | |
2158 | iput(vol->mftmirr_ino); | |
2159 | #endif /* NTFS_RW */ | |
2160 | return FALSE; | |
2161 | } | |
2162 | ||
2163 | /** | |
2164 | * ntfs_put_super - called by the vfs to unmount a volume | |
2165 | * @sb: vfs superblock of volume to unmount | |
2166 | * | |
2167 | * ntfs_put_super() is called by the VFS (from fs/super.c::do_umount()) when | |
2168 | * the volume is being unmounted (umount system call has been invoked) and it | |
2169 | * releases all inodes and memory belonging to the NTFS specific part of the | |
2170 | * super block. | |
2171 | */ | |
2172 | static void ntfs_put_super(struct super_block *sb) | |
2173 | { | |
2174 | ntfs_volume *vol = NTFS_SB(sb); | |
2175 | ||
2176 | ntfs_debug("Entering."); | |
2177 | #ifdef NTFS_RW | |
2178 | /* | |
2179 | * Commit all inodes while they are still open in case some of them | |
2180 | * cause others to be dirtied. | |
2181 | */ | |
2182 | ntfs_commit_inode(vol->vol_ino); | |
2183 | ||
2184 | /* NTFS 3.0+ specific. */ | |
2185 | if (vol->major_ver >= 3) { | |
3f2faef0 AA |
2186 | if (vol->usnjrnl_j_ino) |
2187 | ntfs_commit_inode(vol->usnjrnl_j_ino); | |
2188 | if (vol->usnjrnl_max_ino) | |
2189 | ntfs_commit_inode(vol->usnjrnl_max_ino); | |
2190 | if (vol->usnjrnl_ino) | |
2191 | ntfs_commit_inode(vol->usnjrnl_ino); | |
1da177e4 LT |
2192 | if (vol->quota_q_ino) |
2193 | ntfs_commit_inode(vol->quota_q_ino); | |
2194 | if (vol->quota_ino) | |
2195 | ntfs_commit_inode(vol->quota_ino); | |
2196 | if (vol->extend_ino) | |
2197 | ntfs_commit_inode(vol->extend_ino); | |
2198 | if (vol->secure_ino) | |
2199 | ntfs_commit_inode(vol->secure_ino); | |
2200 | } | |
2201 | ||
2202 | ntfs_commit_inode(vol->root_ino); | |
2203 | ||
2204 | down_write(&vol->lcnbmp_lock); | |
2205 | ntfs_commit_inode(vol->lcnbmp_ino); | |
2206 | up_write(&vol->lcnbmp_lock); | |
2207 | ||
2208 | down_write(&vol->mftbmp_lock); | |
2209 | ntfs_commit_inode(vol->mftbmp_ino); | |
2210 | up_write(&vol->mftbmp_lock); | |
2211 | ||
2212 | if (vol->logfile_ino) | |
2213 | ntfs_commit_inode(vol->logfile_ino); | |
2214 | ||
2215 | if (vol->mftmirr_ino) | |
2216 | ntfs_commit_inode(vol->mftmirr_ino); | |
2217 | ntfs_commit_inode(vol->mft_ino); | |
2218 | ||
2219 | /* | |
2220 | * If a read-write mount and no volume errors have occured, mark the | |
2221 | * volume clean. Also, re-commit all affected inodes. | |
2222 | */ | |
2223 | if (!(sb->s_flags & MS_RDONLY)) { | |
2224 | if (!NVolErrors(vol)) { | |
2225 | if (ntfs_clear_volume_flags(vol, VOLUME_IS_DIRTY)) | |
2226 | ntfs_warning(sb, "Failed to clear dirty bit " | |
2227 | "in volume information " | |
2228 | "flags. Run chkdsk."); | |
2229 | ntfs_commit_inode(vol->vol_ino); | |
2230 | ntfs_commit_inode(vol->root_ino); | |
2231 | if (vol->mftmirr_ino) | |
2232 | ntfs_commit_inode(vol->mftmirr_ino); | |
2233 | ntfs_commit_inode(vol->mft_ino); | |
2234 | } else { | |
2235 | ntfs_warning(sb, "Volume has errors. Leaving volume " | |
2236 | "marked dirty. Run chkdsk."); | |
2237 | } | |
2238 | } | |
2239 | #endif /* NTFS_RW */ | |
2240 | ||
2241 | iput(vol->vol_ino); | |
2242 | vol->vol_ino = NULL; | |
2243 | ||
2244 | /* NTFS 3.0+ specific clean up. */ | |
2245 | if (vol->major_ver >= 3) { | |
2246 | #ifdef NTFS_RW | |
3f2faef0 AA |
2247 | if (vol->usnjrnl_j_ino) { |
2248 | iput(vol->usnjrnl_j_ino); | |
2249 | vol->usnjrnl_j_ino = NULL; | |
2250 | } | |
2251 | if (vol->usnjrnl_max_ino) { | |
2252 | iput(vol->usnjrnl_max_ino); | |
2253 | vol->usnjrnl_max_ino = NULL; | |
2254 | } | |
2255 | if (vol->usnjrnl_ino) { | |
2256 | iput(vol->usnjrnl_ino); | |
2257 | vol->usnjrnl_ino = NULL; | |
2258 | } | |
1da177e4 LT |
2259 | if (vol->quota_q_ino) { |
2260 | iput(vol->quota_q_ino); | |
2261 | vol->quota_q_ino = NULL; | |
2262 | } | |
2263 | if (vol->quota_ino) { | |
2264 | iput(vol->quota_ino); | |
2265 | vol->quota_ino = NULL; | |
2266 | } | |
2267 | #endif /* NTFS_RW */ | |
2268 | if (vol->extend_ino) { | |
2269 | iput(vol->extend_ino); | |
2270 | vol->extend_ino = NULL; | |
2271 | } | |
2272 | if (vol->secure_ino) { | |
2273 | iput(vol->secure_ino); | |
2274 | vol->secure_ino = NULL; | |
2275 | } | |
2276 | } | |
2277 | ||
2278 | iput(vol->root_ino); | |
2279 | vol->root_ino = NULL; | |
2280 | ||
2281 | down_write(&vol->lcnbmp_lock); | |
2282 | iput(vol->lcnbmp_ino); | |
2283 | vol->lcnbmp_ino = NULL; | |
2284 | up_write(&vol->lcnbmp_lock); | |
2285 | ||
2286 | down_write(&vol->mftbmp_lock); | |
2287 | iput(vol->mftbmp_ino); | |
2288 | vol->mftbmp_ino = NULL; | |
2289 | up_write(&vol->mftbmp_lock); | |
2290 | ||
2291 | #ifdef NTFS_RW | |
2292 | if (vol->logfile_ino) { | |
2293 | iput(vol->logfile_ino); | |
2294 | vol->logfile_ino = NULL; | |
2295 | } | |
2296 | if (vol->mftmirr_ino) { | |
2297 | /* Re-commit the mft mirror and mft just in case. */ | |
2298 | ntfs_commit_inode(vol->mftmirr_ino); | |
2299 | ntfs_commit_inode(vol->mft_ino); | |
2300 | iput(vol->mftmirr_ino); | |
2301 | vol->mftmirr_ino = NULL; | |
2302 | } | |
2303 | /* | |
2304 | * If any dirty inodes are left, throw away all mft data page cache | |
2305 | * pages to allow a clean umount. This should never happen any more | |
2306 | * due to mft.c::ntfs_mft_writepage() cleaning all the dirty pages as | |
2307 | * the underlying mft records are written out and cleaned. If it does, | |
2308 | * happen anyway, we want to know... | |
2309 | */ | |
2310 | ntfs_commit_inode(vol->mft_ino); | |
2311 | write_inode_now(vol->mft_ino, 1); | |
2312 | if (!list_empty(&sb->s_dirty)) { | |
2313 | const char *s1, *s2; | |
2314 | ||
1b1dcc1b | 2315 | mutex_lock(&vol->mft_ino->i_mutex); |
1da177e4 | 2316 | truncate_inode_pages(vol->mft_ino->i_mapping, 0); |
1b1dcc1b | 2317 | mutex_unlock(&vol->mft_ino->i_mutex); |
1da177e4 LT |
2318 | write_inode_now(vol->mft_ino, 1); |
2319 | if (!list_empty(&sb->s_dirty)) { | |
2320 | static const char *_s1 = "inodes"; | |
2321 | static const char *_s2 = ""; | |
2322 | s1 = _s1; | |
2323 | s2 = _s2; | |
2324 | } else { | |
2325 | static const char *_s1 = "mft pages"; | |
2326 | static const char *_s2 = "They have been thrown " | |
2327 | "away. "; | |
2328 | s1 = _s1; | |
2329 | s2 = _s2; | |
2330 | } | |
2331 | ntfs_error(sb, "Dirty %s found at umount time. %sYou should " | |
2332 | "run chkdsk. Please email " | |
2333 | "linux-ntfs-dev@lists.sourceforge.net and say " | |
2334 | "that you saw this message. Thank you.", s1, | |
2335 | s2); | |
2336 | } | |
2337 | #endif /* NTFS_RW */ | |
2338 | ||
2339 | iput(vol->mft_ino); | |
2340 | vol->mft_ino = NULL; | |
2341 | ||
2342 | /* Throw away the table of attribute definitions. */ | |
2343 | vol->attrdef_size = 0; | |
2344 | if (vol->attrdef) { | |
2345 | ntfs_free(vol->attrdef); | |
2346 | vol->attrdef = NULL; | |
2347 | } | |
2348 | vol->upcase_len = 0; | |
2349 | /* | |
2350 | * Destroy the global default upcase table if necessary. Also decrease | |
2351 | * the number of upcase users if we are a user. | |
2352 | */ | |
2353 | down(&ntfs_lock); | |
2354 | if (vol->upcase == default_upcase) { | |
2355 | ntfs_nr_upcase_users--; | |
2356 | vol->upcase = NULL; | |
2357 | } | |
2358 | if (!ntfs_nr_upcase_users && default_upcase) { | |
2359 | ntfs_free(default_upcase); | |
2360 | default_upcase = NULL; | |
2361 | } | |
2362 | if (vol->cluster_size <= 4096 && !--ntfs_nr_compression_users) | |
2363 | free_compression_buffers(); | |
2364 | up(&ntfs_lock); | |
2365 | if (vol->upcase) { | |
2366 | ntfs_free(vol->upcase); | |
2367 | vol->upcase = NULL; | |
2368 | } | |
2369 | if (vol->nls_map) { | |
2370 | unload_nls(vol->nls_map); | |
2371 | vol->nls_map = NULL; | |
2372 | } | |
2373 | sb->s_fs_info = NULL; | |
2374 | kfree(vol); | |
2375 | return; | |
2376 | } | |
2377 | ||
2378 | /** | |
2379 | * get_nr_free_clusters - return the number of free clusters on a volume | |
2380 | * @vol: ntfs volume for which to obtain free cluster count | |
2381 | * | |
2382 | * Calculate the number of free clusters on the mounted NTFS volume @vol. We | |
2383 | * actually calculate the number of clusters in use instead because this | |
2384 | * allows us to not care about partial pages as these will be just zero filled | |
2385 | * and hence not be counted as allocated clusters. | |
2386 | * | |
2387 | * The only particularity is that clusters beyond the end of the logical ntfs | |
2388 | * volume will be marked as allocated to prevent errors which means we have to | |
2389 | * discount those at the end. This is important as the cluster bitmap always | |
2390 | * has a size in multiples of 8 bytes, i.e. up to 63 clusters could be outside | |
2391 | * the logical volume and marked in use when they are not as they do not exist. | |
2392 | * | |
2393 | * If any pages cannot be read we assume all clusters in the erroring pages are | |
2394 | * in use. This means we return an underestimate on errors which is better than | |
2395 | * an overestimate. | |
2396 | */ | |
2397 | static s64 get_nr_free_clusters(ntfs_volume *vol) | |
2398 | { | |
2399 | s64 nr_free = vol->nr_clusters; | |
2400 | u32 *kaddr; | |
2401 | struct address_space *mapping = vol->lcnbmp_ino->i_mapping; | |
2402 | filler_t *readpage = (filler_t*)mapping->a_ops->readpage; | |
2403 | struct page *page; | |
218357ff | 2404 | pgoff_t index, max_index; |
1da177e4 LT |
2405 | |
2406 | ntfs_debug("Entering."); | |
2407 | /* Serialize accesses to the cluster bitmap. */ | |
2408 | down_read(&vol->lcnbmp_lock); | |
2409 | /* | |
2410 | * Convert the number of bits into bytes rounded up, then convert into | |
2411 | * multiples of PAGE_CACHE_SIZE, rounding up so that if we have one | |
2412 | * full and one partial page max_index = 2. | |
2413 | */ | |
2414 | max_index = (((vol->nr_clusters + 7) >> 3) + PAGE_CACHE_SIZE - 1) >> | |
2415 | PAGE_CACHE_SHIFT; | |
218357ff AA |
2416 | /* Use multiples of 4 bytes, thus max_size is PAGE_CACHE_SIZE / 4. */ |
2417 | ntfs_debug("Reading $Bitmap, max_index = 0x%lx, max_size = 0x%lx.", | |
2418 | max_index, PAGE_CACHE_SIZE / 4); | |
2419 | for (index = 0; index < max_index; index++) { | |
1da177e4 LT |
2420 | unsigned int i; |
2421 | /* | |
2422 | * Read the page from page cache, getting it from backing store | |
2423 | * if necessary, and increment the use count. | |
2424 | */ | |
2425 | page = read_cache_page(mapping, index, (filler_t*)readpage, | |
2426 | NULL); | |
2427 | /* Ignore pages which errored synchronously. */ | |
2428 | if (IS_ERR(page)) { | |
2429 | ntfs_debug("Sync read_cache_page() error. Skipping " | |
2430 | "page (index 0x%lx).", index); | |
2431 | nr_free -= PAGE_CACHE_SIZE * 8; | |
2432 | continue; | |
2433 | } | |
2434 | wait_on_page_locked(page); | |
2435 | /* Ignore pages which errored asynchronously. */ | |
2436 | if (!PageUptodate(page)) { | |
2437 | ntfs_debug("Async read_cache_page() error. Skipping " | |
2438 | "page (index 0x%lx).", index); | |
2439 | page_cache_release(page); | |
2440 | nr_free -= PAGE_CACHE_SIZE * 8; | |
2441 | continue; | |
2442 | } | |
2443 | kaddr = (u32*)kmap_atomic(page, KM_USER0); | |
2444 | /* | |
2445 | * For each 4 bytes, subtract the number of set bits. If this | |
2446 | * is the last page and it is partial we don't really care as | |
2447 | * it just means we do a little extra work but it won't affect | |
2448 | * the result as all out of range bytes are set to zero by | |
2449 | * ntfs_readpage(). | |
2450 | */ | |
218357ff | 2451 | for (i = 0; i < PAGE_CACHE_SIZE / 4; i++) |
1da177e4 LT |
2452 | nr_free -= (s64)hweight32(kaddr[i]); |
2453 | kunmap_atomic(kaddr, KM_USER0); | |
2454 | page_cache_release(page); | |
2455 | } | |
2456 | ntfs_debug("Finished reading $Bitmap, last index = 0x%lx.", index - 1); | |
2457 | /* | |
2458 | * Fixup for eventual bits outside logical ntfs volume (see function | |
2459 | * description above). | |
2460 | */ | |
2461 | if (vol->nr_clusters & 63) | |
2462 | nr_free += 64 - (vol->nr_clusters & 63); | |
2463 | up_read(&vol->lcnbmp_lock); | |
2464 | /* If errors occured we may well have gone below zero, fix this. */ | |
2465 | if (nr_free < 0) | |
2466 | nr_free = 0; | |
2467 | ntfs_debug("Exiting."); | |
2468 | return nr_free; | |
2469 | } | |
2470 | ||
2471 | /** | |
2472 | * __get_nr_free_mft_records - return the number of free inodes on a volume | |
2473 | * @vol: ntfs volume for which to obtain free inode count | |
c002f425 | 2474 | * @nr_free: number of mft records in filesystem |
218357ff | 2475 | * @max_index: maximum number of pages containing set bits |
1da177e4 LT |
2476 | * |
2477 | * Calculate the number of free mft records (inodes) on the mounted NTFS | |
2478 | * volume @vol. We actually calculate the number of mft records in use instead | |
2479 | * because this allows us to not care about partial pages as these will be just | |
2480 | * zero filled and hence not be counted as allocated mft record. | |
2481 | * | |
2482 | * If any pages cannot be read we assume all mft records in the erroring pages | |
2483 | * are in use. This means we return an underestimate on errors which is better | |
2484 | * than an overestimate. | |
2485 | * | |
2486 | * NOTE: Caller must hold mftbmp_lock rw_semaphore for reading or writing. | |
2487 | */ | |
218357ff AA |
2488 | static unsigned long __get_nr_free_mft_records(ntfs_volume *vol, |
2489 | s64 nr_free, const pgoff_t max_index) | |
1da177e4 | 2490 | { |
1da177e4 LT |
2491 | u32 *kaddr; |
2492 | struct address_space *mapping = vol->mftbmp_ino->i_mapping; | |
2493 | filler_t *readpage = (filler_t*)mapping->a_ops->readpage; | |
2494 | struct page *page; | |
218357ff | 2495 | pgoff_t index; |
1da177e4 LT |
2496 | |
2497 | ntfs_debug("Entering."); | |
218357ff | 2498 | /* Use multiples of 4 bytes, thus max_size is PAGE_CACHE_SIZE / 4. */ |
1da177e4 | 2499 | ntfs_debug("Reading $MFT/$BITMAP, max_index = 0x%lx, max_size = " |
218357ff AA |
2500 | "0x%lx.", max_index, PAGE_CACHE_SIZE / 4); |
2501 | for (index = 0; index < max_index; index++) { | |
1da177e4 LT |
2502 | unsigned int i; |
2503 | /* | |
2504 | * Read the page from page cache, getting it from backing store | |
2505 | * if necessary, and increment the use count. | |
2506 | */ | |
2507 | page = read_cache_page(mapping, index, (filler_t*)readpage, | |
2508 | NULL); | |
2509 | /* Ignore pages which errored synchronously. */ | |
2510 | if (IS_ERR(page)) { | |
2511 | ntfs_debug("Sync read_cache_page() error. Skipping " | |
2512 | "page (index 0x%lx).", index); | |
2513 | nr_free -= PAGE_CACHE_SIZE * 8; | |
2514 | continue; | |
2515 | } | |
2516 | wait_on_page_locked(page); | |
2517 | /* Ignore pages which errored asynchronously. */ | |
2518 | if (!PageUptodate(page)) { | |
2519 | ntfs_debug("Async read_cache_page() error. Skipping " | |
2520 | "page (index 0x%lx).", index); | |
2521 | page_cache_release(page); | |
2522 | nr_free -= PAGE_CACHE_SIZE * 8; | |
2523 | continue; | |
2524 | } | |
2525 | kaddr = (u32*)kmap_atomic(page, KM_USER0); | |
2526 | /* | |
2527 | * For each 4 bytes, subtract the number of set bits. If this | |
2528 | * is the last page and it is partial we don't really care as | |
2529 | * it just means we do a little extra work but it won't affect | |
2530 | * the result as all out of range bytes are set to zero by | |
2531 | * ntfs_readpage(). | |
2532 | */ | |
218357ff | 2533 | for (i = 0; i < PAGE_CACHE_SIZE / 4; i++) |
1da177e4 LT |
2534 | nr_free -= (s64)hweight32(kaddr[i]); |
2535 | kunmap_atomic(kaddr, KM_USER0); | |
2536 | page_cache_release(page); | |
2537 | } | |
2538 | ntfs_debug("Finished reading $MFT/$BITMAP, last index = 0x%lx.", | |
2539 | index - 1); | |
2540 | /* If errors occured we may well have gone below zero, fix this. */ | |
2541 | if (nr_free < 0) | |
2542 | nr_free = 0; | |
2543 | ntfs_debug("Exiting."); | |
2544 | return nr_free; | |
2545 | } | |
2546 | ||
2547 | /** | |
2548 | * ntfs_statfs - return information about mounted NTFS volume | |
2549 | * @sb: super block of mounted volume | |
2550 | * @sfs: statfs structure in which to return the information | |
2551 | * | |
2552 | * Return information about the mounted NTFS volume @sb in the statfs structure | |
2553 | * pointed to by @sfs (this is initialized with zeros before ntfs_statfs is | |
2554 | * called). We interpret the values to be correct of the moment in time at | |
2555 | * which we are called. Most values are variable otherwise and this isn't just | |
2556 | * the free values but the totals as well. For example we can increase the | |
2557 | * total number of file nodes if we run out and we can keep doing this until | |
2558 | * there is no more space on the volume left at all. | |
2559 | * | |
2560 | * Called from vfs_statfs which is used to handle the statfs, fstatfs, and | |
2561 | * ustat system calls. | |
2562 | * | |
2563 | * Return 0 on success or -errno on error. | |
2564 | */ | |
2565 | static int ntfs_statfs(struct super_block *sb, struct kstatfs *sfs) | |
2566 | { | |
1da177e4 | 2567 | s64 size; |
218357ff AA |
2568 | ntfs_volume *vol = NTFS_SB(sb); |
2569 | ntfs_inode *mft_ni = NTFS_I(vol->mft_ino); | |
2570 | pgoff_t max_index; | |
2571 | unsigned long flags; | |
1da177e4 LT |
2572 | |
2573 | ntfs_debug("Entering."); | |
2574 | /* Type of filesystem. */ | |
2575 | sfs->f_type = NTFS_SB_MAGIC; | |
2576 | /* Optimal transfer block size. */ | |
2577 | sfs->f_bsize = PAGE_CACHE_SIZE; | |
2578 | /* | |
c002f425 | 2579 | * Total data blocks in filesystem in units of f_bsize and since |
1da177e4 LT |
2580 | * inodes are also stored in data blocs ($MFT is a file) this is just |
2581 | * the total clusters. | |
2582 | */ | |
2583 | sfs->f_blocks = vol->nr_clusters << vol->cluster_size_bits >> | |
2584 | PAGE_CACHE_SHIFT; | |
c002f425 | 2585 | /* Free data blocks in filesystem in units of f_bsize. */ |
1da177e4 LT |
2586 | size = get_nr_free_clusters(vol) << vol->cluster_size_bits >> |
2587 | PAGE_CACHE_SHIFT; | |
2588 | if (size < 0LL) | |
2589 | size = 0LL; | |
2590 | /* Free blocks avail to non-superuser, same as above on NTFS. */ | |
2591 | sfs->f_bavail = sfs->f_bfree = size; | |
2592 | /* Serialize accesses to the inode bitmap. */ | |
2593 | down_read(&vol->mftbmp_lock); | |
218357ff AA |
2594 | read_lock_irqsave(&mft_ni->size_lock, flags); |
2595 | size = i_size_read(vol->mft_ino) >> vol->mft_record_size_bits; | |
2596 | /* | |
2597 | * Convert the maximum number of set bits into bytes rounded up, then | |
2598 | * convert into multiples of PAGE_CACHE_SIZE, rounding up so that if we | |
2599 | * have one full and one partial page max_index = 2. | |
2600 | */ | |
2601 | max_index = ((((mft_ni->initialized_size >> vol->mft_record_size_bits) | |
2602 | + 7) >> 3) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; | |
2603 | read_unlock_irqrestore(&mft_ni->size_lock, flags); | |
c002f425 | 2604 | /* Number of inodes in filesystem (at this point in time). */ |
218357ff | 2605 | sfs->f_files = size; |
1da177e4 | 2606 | /* Free inodes in fs (based on current total count). */ |
218357ff | 2607 | sfs->f_ffree = __get_nr_free_mft_records(vol, size, max_index); |
1da177e4 LT |
2608 | up_read(&vol->mftbmp_lock); |
2609 | /* | |
2610 | * File system id. This is extremely *nix flavour dependent and even | |
2611 | * within Linux itself all fs do their own thing. I interpret this to | |
2612 | * mean a unique id associated with the mounted fs and not the id | |
c002f425 AA |
2613 | * associated with the filesystem driver, the latter is already given |
2614 | * by the filesystem type in sfs->f_type. Thus we use the 64-bit | |
1da177e4 LT |
2615 | * volume serial number splitting it into two 32-bit parts. We enter |
2616 | * the least significant 32-bits in f_fsid[0] and the most significant | |
2617 | * 32-bits in f_fsid[1]. | |
2618 | */ | |
2619 | sfs->f_fsid.val[0] = vol->serial_no & 0xffffffff; | |
2620 | sfs->f_fsid.val[1] = (vol->serial_no >> 32) & 0xffffffff; | |
2621 | /* Maximum length of filenames. */ | |
2622 | sfs->f_namelen = NTFS_MAX_NAME_LEN; | |
2623 | return 0; | |
2624 | } | |
2625 | ||
2626 | /** | |
2627 | * The complete super operations. | |
2628 | */ | |
2629 | static struct super_operations ntfs_sops = { | |
2630 | .alloc_inode = ntfs_alloc_big_inode, /* VFS: Allocate new inode. */ | |
2631 | .destroy_inode = ntfs_destroy_big_inode, /* VFS: Deallocate inode. */ | |
2632 | .put_inode = ntfs_put_inode, /* VFS: Called just before | |
2633 | the inode reference count | |
2634 | is decreased. */ | |
2635 | #ifdef NTFS_RW | |
2636 | //.dirty_inode = NULL, /* VFS: Called from | |
2637 | // __mark_inode_dirty(). */ | |
2638 | .write_inode = ntfs_write_inode, /* VFS: Write dirty inode to | |
2639 | disk. */ | |
2640 | //.drop_inode = NULL, /* VFS: Called just after the | |
2641 | // inode reference count has | |
2642 | // been decreased to zero. | |
2643 | // NOTE: The inode lock is | |
2644 | // held. See fs/inode.c:: | |
2645 | // generic_drop_inode(). */ | |
2646 | //.delete_inode = NULL, /* VFS: Delete inode from disk. | |
2647 | // Called when i_count becomes | |
2648 | // 0 and i_nlink is also 0. */ | |
2649 | //.write_super = NULL, /* Flush dirty super block to | |
2650 | // disk. */ | |
2651 | //.sync_fs = NULL, /* ? */ | |
2652 | //.write_super_lockfs = NULL, /* ? */ | |
2653 | //.unlockfs = NULL, /* ? */ | |
2654 | #endif /* NTFS_RW */ | |
2655 | .put_super = ntfs_put_super, /* Syscall: umount. */ | |
2656 | .statfs = ntfs_statfs, /* Syscall: statfs */ | |
2657 | .remount_fs = ntfs_remount, /* Syscall: mount -o remount. */ | |
2658 | .clear_inode = ntfs_clear_big_inode, /* VFS: Called when an inode is | |
2659 | removed from memory. */ | |
2660 | //.umount_begin = NULL, /* Forced umount. */ | |
2661 | .show_options = ntfs_show_options, /* Show mount options in | |
2662 | proc. */ | |
2663 | }; | |
2664 | ||
1da177e4 | 2665 | /** |
c002f425 AA |
2666 | * ntfs_fill_super - mount an ntfs filesystem |
2667 | * @sb: super block of ntfs filesystem to mount | |
1da177e4 LT |
2668 | * @opt: string containing the mount options |
2669 | * @silent: silence error output | |
2670 | * | |
2671 | * ntfs_fill_super() is called by the VFS to mount the device described by @sb | |
c002f425 | 2672 | * with the mount otions in @data with the NTFS filesystem. |
1da177e4 LT |
2673 | * |
2674 | * If @silent is true, remain silent even if errors are detected. This is used | |
c002f425 AA |
2675 | * during bootup, when the kernel tries to mount the root filesystem with all |
2676 | * registered filesystems one after the other until one succeeds. This implies | |
2677 | * that all filesystems except the correct one will quite correctly and | |
1da177e4 LT |
2678 | * expectedly return an error, but nobody wants to see error messages when in |
2679 | * fact this is what is supposed to happen. | |
2680 | * | |
2681 | * NOTE: @sb->s_flags contains the mount options flags. | |
2682 | */ | |
2683 | static int ntfs_fill_super(struct super_block *sb, void *opt, const int silent) | |
2684 | { | |
2685 | ntfs_volume *vol; | |
2686 | struct buffer_head *bh; | |
2687 | struct inode *tmp_ino; | |
2688 | int result; | |
2689 | ||
2690 | ntfs_debug("Entering."); | |
2691 | #ifndef NTFS_RW | |
24a44dca | 2692 | sb->s_flags |= MS_RDONLY; |
1da177e4 LT |
2693 | #endif /* ! NTFS_RW */ |
2694 | /* Allocate a new ntfs_volume and place it in sb->s_fs_info. */ | |
2695 | sb->s_fs_info = kmalloc(sizeof(ntfs_volume), GFP_NOFS); | |
2696 | vol = NTFS_SB(sb); | |
2697 | if (!vol) { | |
2698 | if (!silent) | |
2699 | ntfs_error(sb, "Allocation of NTFS volume structure " | |
2700 | "failed. Aborting mount..."); | |
2701 | return -ENOMEM; | |
2702 | } | |
2703 | /* Initialize ntfs_volume structure. */ | |
442d207e AA |
2704 | *vol = (ntfs_volume) { |
2705 | .sb = sb, | |
2706 | /* | |
2707 | * Default is group and other don't have any access to files or | |
2708 | * directories while owner has full access. Further, files by | |
2709 | * default are not executable but directories are of course | |
2710 | * browseable. | |
2711 | */ | |
2712 | .fmask = 0177, | |
2713 | .dmask = 0077, | |
2714 | }; | |
1da177e4 | 2715 | init_rwsem(&vol->mftbmp_lock); |
1da177e4 | 2716 | init_rwsem(&vol->lcnbmp_lock); |
1da177e4 LT |
2717 | |
2718 | unlock_kernel(); | |
2719 | ||
c002f425 AA |
2720 | /* By default, enable sparse support. */ |
2721 | NVolSetSparseEnabled(vol); | |
2722 | ||
1da177e4 LT |
2723 | /* Important to get the mount options dealt with now. */ |
2724 | if (!parse_options(vol, (char*)opt)) | |
2725 | goto err_out_now; | |
2726 | ||
2727 | /* | |
2728 | * TODO: Fail safety check. In the future we should really be able to | |
2729 | * cope with this being the case, but for now just bail out. | |
2730 | */ | |
2731 | if (bdev_hardsect_size(sb->s_bdev) > NTFS_BLOCK_SIZE) { | |
2732 | if (!silent) | |
2733 | ntfs_error(sb, "Device has unsupported hardsect_size."); | |
2734 | goto err_out_now; | |
2735 | } | |
2736 | ||
2737 | /* Setup the device access block size to NTFS_BLOCK_SIZE. */ | |
2738 | if (sb_set_blocksize(sb, NTFS_BLOCK_SIZE) != NTFS_BLOCK_SIZE) { | |
2739 | if (!silent) | |
2740 | ntfs_error(sb, "Unable to set block size."); | |
2741 | goto err_out_now; | |
2742 | } | |
2743 | ||
2744 | /* Get the size of the device in units of NTFS_BLOCK_SIZE bytes. */ | |
218357ff AA |
2745 | vol->nr_blocks = i_size_read(sb->s_bdev->bd_inode) >> |
2746 | NTFS_BLOCK_SIZE_BITS; | |
1da177e4 LT |
2747 | |
2748 | /* Read the boot sector and return unlocked buffer head to it. */ | |
2749 | if (!(bh = read_ntfs_boot_sector(sb, silent))) { | |
2750 | if (!silent) | |
2751 | ntfs_error(sb, "Not an NTFS volume."); | |
2752 | goto err_out_now; | |
2753 | } | |
2754 | ||
2755 | /* | |
2756 | * Extract the data from the boot sector and setup the ntfs super block | |
2757 | * using it. | |
2758 | */ | |
2759 | result = parse_ntfs_boot_sector(vol, (NTFS_BOOT_SECTOR*)bh->b_data); | |
2760 | ||
2761 | /* Initialize the cluster and mft allocators. */ | |
2762 | ntfs_setup_allocators(vol); | |
2763 | ||
2764 | brelse(bh); | |
2765 | ||
2766 | if (!result) { | |
2767 | if (!silent) | |
2768 | ntfs_error(sb, "Unsupported NTFS filesystem."); | |
2769 | goto err_out_now; | |
2770 | } | |
2771 | ||
2772 | /* | |
2773 | * TODO: When we start coping with sector sizes different from | |
2774 | * NTFS_BLOCK_SIZE, we now probably need to set the blocksize of the | |
2775 | * device (probably to NTFS_BLOCK_SIZE). | |
2776 | */ | |
2777 | ||
2778 | /* Setup remaining fields in the super block. */ | |
2779 | sb->s_magic = NTFS_SB_MAGIC; | |
2780 | ||
2781 | /* | |
2782 | * Ntfs allows 63 bits for the file size, i.e. correct would be: | |
2783 | * sb->s_maxbytes = ~0ULL >> 1; | |
2784 | * But the kernel uses a long as the page cache page index which on | |
2785 | * 32-bit architectures is only 32-bits. MAX_LFS_FILESIZE is kernel | |
2786 | * defined to the maximum the page cache page index can cope with | |
2787 | * without overflowing the index or to 2^63 - 1, whichever is smaller. | |
2788 | */ | |
2789 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
2790 | ||
2791 | sb->s_time_gran = 100; | |
2792 | ||
2793 | /* | |
2794 | * Now load the metadata required for the page cache and our address | |
2795 | * space operations to function. We do this by setting up a specialised | |
2796 | * read_inode method and then just calling the normal iget() to obtain | |
2797 | * the inode for $MFT which is sufficient to allow our normal inode | |
2798 | * operations and associated address space operations to function. | |
2799 | */ | |
2800 | sb->s_op = &ntfs_sops; | |
2801 | tmp_ino = new_inode(sb); | |
2802 | if (!tmp_ino) { | |
2803 | if (!silent) | |
2804 | ntfs_error(sb, "Failed to load essential metadata."); | |
2805 | goto err_out_now; | |
2806 | } | |
2807 | tmp_ino->i_ino = FILE_MFT; | |
2808 | insert_inode_hash(tmp_ino); | |
2809 | if (ntfs_read_inode_mount(tmp_ino) < 0) { | |
2810 | if (!silent) | |
2811 | ntfs_error(sb, "Failed to load essential metadata."); | |
2812 | goto iput_tmp_ino_err_out_now; | |
2813 | } | |
2814 | down(&ntfs_lock); | |
2815 | /* | |
2816 | * The current mount is a compression user if the cluster size is | |
2817 | * less than or equal 4kiB. | |
2818 | */ | |
2819 | if (vol->cluster_size <= 4096 && !ntfs_nr_compression_users++) { | |
2820 | result = allocate_compression_buffers(); | |
2821 | if (result) { | |
2822 | ntfs_error(NULL, "Failed to allocate buffers " | |
2823 | "for compression engine."); | |
2824 | ntfs_nr_compression_users--; | |
2825 | up(&ntfs_lock); | |
2826 | goto iput_tmp_ino_err_out_now; | |
2827 | } | |
2828 | } | |
2829 | /* | |
2830 | * Generate the global default upcase table if necessary. Also | |
2831 | * temporarily increment the number of upcase users to avoid race | |
2832 | * conditions with concurrent (u)mounts. | |
2833 | */ | |
2834 | if (!default_upcase) | |
2835 | default_upcase = generate_default_upcase(); | |
2836 | ntfs_nr_upcase_users++; | |
2837 | up(&ntfs_lock); | |
2838 | /* | |
2839 | * From now on, ignore @silent parameter. If we fail below this line, | |
2840 | * it will be due to a corrupt fs or a system error, so we report it. | |
2841 | */ | |
2842 | /* | |
2843 | * Open the system files with normal access functions and complete | |
2844 | * setting up the ntfs super block. | |
2845 | */ | |
2846 | if (!load_system_files(vol)) { | |
2847 | ntfs_error(sb, "Failed to load system files."); | |
2848 | goto unl_upcase_iput_tmp_ino_err_out_now; | |
2849 | } | |
2850 | if ((sb->s_root = d_alloc_root(vol->root_ino))) { | |
2851 | /* We increment i_count simulating an ntfs_iget(). */ | |
2852 | atomic_inc(&vol->root_ino->i_count); | |
2853 | ntfs_debug("Exiting, status successful."); | |
2854 | /* Release the default upcase if it has no users. */ | |
2855 | down(&ntfs_lock); | |
2856 | if (!--ntfs_nr_upcase_users && default_upcase) { | |
2857 | ntfs_free(default_upcase); | |
2858 | default_upcase = NULL; | |
2859 | } | |
2860 | up(&ntfs_lock); | |
2861 | sb->s_export_op = &ntfs_export_ops; | |
2862 | lock_kernel(); | |
2863 | return 0; | |
2864 | } | |
2865 | ntfs_error(sb, "Failed to allocate root directory."); | |
2866 | /* Clean up after the successful load_system_files() call from above. */ | |
2867 | // TODO: Use ntfs_put_super() instead of repeating all this code... | |
2868 | // FIXME: Should mark the volume clean as the error is most likely | |
2869 | // -ENOMEM. | |
2870 | iput(vol->vol_ino); | |
2871 | vol->vol_ino = NULL; | |
2872 | /* NTFS 3.0+ specific clean up. */ | |
2873 | if (vol->major_ver >= 3) { | |
2874 | #ifdef NTFS_RW | |
3f2faef0 AA |
2875 | if (vol->usnjrnl_j_ino) { |
2876 | iput(vol->usnjrnl_j_ino); | |
2877 | vol->usnjrnl_j_ino = NULL; | |
2878 | } | |
2879 | if (vol->usnjrnl_max_ino) { | |
2880 | iput(vol->usnjrnl_max_ino); | |
2881 | vol->usnjrnl_max_ino = NULL; | |
2882 | } | |
2883 | if (vol->usnjrnl_ino) { | |
2884 | iput(vol->usnjrnl_ino); | |
2885 | vol->usnjrnl_ino = NULL; | |
2886 | } | |
1da177e4 LT |
2887 | if (vol->quota_q_ino) { |
2888 | iput(vol->quota_q_ino); | |
2889 | vol->quota_q_ino = NULL; | |
2890 | } | |
2891 | if (vol->quota_ino) { | |
2892 | iput(vol->quota_ino); | |
2893 | vol->quota_ino = NULL; | |
2894 | } | |
2895 | #endif /* NTFS_RW */ | |
2896 | if (vol->extend_ino) { | |
2897 | iput(vol->extend_ino); | |
2898 | vol->extend_ino = NULL; | |
2899 | } | |
2900 | if (vol->secure_ino) { | |
2901 | iput(vol->secure_ino); | |
2902 | vol->secure_ino = NULL; | |
2903 | } | |
2904 | } | |
2905 | iput(vol->root_ino); | |
2906 | vol->root_ino = NULL; | |
2907 | iput(vol->lcnbmp_ino); | |
2908 | vol->lcnbmp_ino = NULL; | |
2909 | iput(vol->mftbmp_ino); | |
2910 | vol->mftbmp_ino = NULL; | |
2911 | #ifdef NTFS_RW | |
2912 | if (vol->logfile_ino) { | |
2913 | iput(vol->logfile_ino); | |
2914 | vol->logfile_ino = NULL; | |
2915 | } | |
2916 | if (vol->mftmirr_ino) { | |
2917 | iput(vol->mftmirr_ino); | |
2918 | vol->mftmirr_ino = NULL; | |
2919 | } | |
2920 | #endif /* NTFS_RW */ | |
2921 | /* Throw away the table of attribute definitions. */ | |
2922 | vol->attrdef_size = 0; | |
2923 | if (vol->attrdef) { | |
2924 | ntfs_free(vol->attrdef); | |
2925 | vol->attrdef = NULL; | |
2926 | } | |
2927 | vol->upcase_len = 0; | |
2928 | down(&ntfs_lock); | |
2929 | if (vol->upcase == default_upcase) { | |
2930 | ntfs_nr_upcase_users--; | |
2931 | vol->upcase = NULL; | |
2932 | } | |
2933 | up(&ntfs_lock); | |
2934 | if (vol->upcase) { | |
2935 | ntfs_free(vol->upcase); | |
2936 | vol->upcase = NULL; | |
2937 | } | |
2938 | if (vol->nls_map) { | |
2939 | unload_nls(vol->nls_map); | |
2940 | vol->nls_map = NULL; | |
2941 | } | |
2942 | /* Error exit code path. */ | |
2943 | unl_upcase_iput_tmp_ino_err_out_now: | |
2944 | /* | |
2945 | * Decrease the number of upcase users and destroy the global default | |
2946 | * upcase table if necessary. | |
2947 | */ | |
2948 | down(&ntfs_lock); | |
2949 | if (!--ntfs_nr_upcase_users && default_upcase) { | |
2950 | ntfs_free(default_upcase); | |
2951 | default_upcase = NULL; | |
2952 | } | |
2953 | if (vol->cluster_size <= 4096 && !--ntfs_nr_compression_users) | |
2954 | free_compression_buffers(); | |
2955 | up(&ntfs_lock); | |
2956 | iput_tmp_ino_err_out_now: | |
2957 | iput(tmp_ino); | |
2958 | if (vol->mft_ino && vol->mft_ino != tmp_ino) | |
2959 | iput(vol->mft_ino); | |
2960 | vol->mft_ino = NULL; | |
2961 | /* | |
2962 | * This is needed to get ntfs_clear_extent_inode() called for each | |
2963 | * inode we have ever called ntfs_iget()/iput() on, otherwise we A) | |
2964 | * leak resources and B) a subsequent mount fails automatically due to | |
2965 | * ntfs_iget() never calling down into our ntfs_read_locked_inode() | |
2966 | * method again... FIXME: Do we need to do this twice now because of | |
2967 | * attribute inodes? I think not, so leave as is for now... (AIA) | |
2968 | */ | |
2969 | if (invalidate_inodes(sb)) { | |
2970 | ntfs_error(sb, "Busy inodes left. This is most likely a NTFS " | |
2971 | "driver bug."); | |
2972 | /* Copied from fs/super.c. I just love this message. (-; */ | |
2973 | printk("NTFS: Busy inodes after umount. Self-destruct in 5 " | |
2974 | "seconds. Have a nice day...\n"); | |
2975 | } | |
2976 | /* Errors at this stage are irrelevant. */ | |
2977 | err_out_now: | |
2978 | lock_kernel(); | |
2979 | sb->s_fs_info = NULL; | |
2980 | kfree(vol); | |
2981 | ntfs_debug("Failed, returning -EINVAL."); | |
2982 | return -EINVAL; | |
2983 | } | |
2984 | ||
2985 | /* | |
2986 | * This is a slab cache to optimize allocations and deallocations of Unicode | |
2987 | * strings of the maximum length allowed by NTFS, which is NTFS_MAX_NAME_LEN | |
2988 | * (255) Unicode characters + a terminating NULL Unicode character. | |
2989 | */ | |
64419d93 | 2990 | struct kmem_cache *ntfs_name_cache; |
1da177e4 | 2991 | |
7fafb8b6 | 2992 | /* Slab caches for efficient allocation/deallocation of inodes. */ |
64419d93 PE |
2993 | struct kmem_cache *ntfs_inode_cache; |
2994 | struct kmem_cache *ntfs_big_inode_cache; | |
1da177e4 LT |
2995 | |
2996 | /* Init once constructor for the inode slab cache. */ | |
64419d93 | 2997 | static void ntfs_big_inode_init_once(void *foo, struct kmem_cache *cachep, |
1da177e4 LT |
2998 | unsigned long flags) |
2999 | { | |
3000 | ntfs_inode *ni = (ntfs_inode *)foo; | |
3001 | ||
3002 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | |
3003 | SLAB_CTOR_CONSTRUCTOR) | |
3004 | inode_init_once(VFS_I(ni)); | |
3005 | } | |
3006 | ||
3007 | /* | |
3008 | * Slab caches to optimize allocations and deallocations of attribute search | |
3009 | * contexts and index contexts, respectively. | |
3010 | */ | |
64419d93 PE |
3011 | struct kmem_cache *ntfs_attr_ctx_cache; |
3012 | struct kmem_cache *ntfs_index_ctx_cache; | |
1da177e4 LT |
3013 | |
3014 | /* Driver wide semaphore. */ | |
3015 | DECLARE_MUTEX(ntfs_lock); | |
3016 | ||
3017 | static struct super_block *ntfs_get_sb(struct file_system_type *fs_type, | |
3018 | int flags, const char *dev_name, void *data) | |
3019 | { | |
3020 | return get_sb_bdev(fs_type, flags, dev_name, data, ntfs_fill_super); | |
3021 | } | |
3022 | ||
3023 | static struct file_system_type ntfs_fs_type = { | |
3024 | .owner = THIS_MODULE, | |
3025 | .name = "ntfs", | |
3026 | .get_sb = ntfs_get_sb, | |
3027 | .kill_sb = kill_block_super, | |
3028 | .fs_flags = FS_REQUIRES_DEV, | |
3029 | }; | |
3030 | ||
3031 | /* Stable names for the slab caches. */ | |
3032 | static const char ntfs_index_ctx_cache_name[] = "ntfs_index_ctx_cache"; | |
3033 | static const char ntfs_attr_ctx_cache_name[] = "ntfs_attr_ctx_cache"; | |
3034 | static const char ntfs_name_cache_name[] = "ntfs_name_cache"; | |
3035 | static const char ntfs_inode_cache_name[] = "ntfs_inode_cache"; | |
3036 | static const char ntfs_big_inode_cache_name[] = "ntfs_big_inode_cache"; | |
3037 | ||
3038 | static int __init init_ntfs_fs(void) | |
3039 | { | |
3040 | int err = 0; | |
3041 | ||
3042 | /* This may be ugly but it results in pretty output so who cares. (-8 */ | |
3043 | printk(KERN_INFO "NTFS driver " NTFS_VERSION " [Flags: R/" | |
3044 | #ifdef NTFS_RW | |
3045 | "W" | |
3046 | #else | |
3047 | "O" | |
3048 | #endif | |
3049 | #ifdef DEBUG | |
3050 | " DEBUG" | |
3051 | #endif | |
3052 | #ifdef MODULE | |
3053 | " MODULE" | |
3054 | #endif | |
3055 | "].\n"); | |
3056 | ||
3057 | ntfs_debug("Debug messages are enabled."); | |
3058 | ||
3059 | ntfs_index_ctx_cache = kmem_cache_create(ntfs_index_ctx_cache_name, | |
3060 | sizeof(ntfs_index_context), 0 /* offset */, | |
3061 | SLAB_HWCACHE_ALIGN, NULL /* ctor */, NULL /* dtor */); | |
3062 | if (!ntfs_index_ctx_cache) { | |
3063 | printk(KERN_CRIT "NTFS: Failed to create %s!\n", | |
3064 | ntfs_index_ctx_cache_name); | |
3065 | goto ictx_err_out; | |
3066 | } | |
3067 | ntfs_attr_ctx_cache = kmem_cache_create(ntfs_attr_ctx_cache_name, | |
3068 | sizeof(ntfs_attr_search_ctx), 0 /* offset */, | |
3069 | SLAB_HWCACHE_ALIGN, NULL /* ctor */, NULL /* dtor */); | |
3070 | if (!ntfs_attr_ctx_cache) { | |
3071 | printk(KERN_CRIT "NTFS: Failed to create %s!\n", | |
3072 | ntfs_attr_ctx_cache_name); | |
3073 | goto actx_err_out; | |
3074 | } | |
3075 | ||
3076 | ntfs_name_cache = kmem_cache_create(ntfs_name_cache_name, | |
3077 | (NTFS_MAX_NAME_LEN+1) * sizeof(ntfschar), 0, | |
3078 | SLAB_HWCACHE_ALIGN, NULL, NULL); | |
3079 | if (!ntfs_name_cache) { | |
3080 | printk(KERN_CRIT "NTFS: Failed to create %s!\n", | |
3081 | ntfs_name_cache_name); | |
3082 | goto name_err_out; | |
3083 | } | |
3084 | ||
3085 | ntfs_inode_cache = kmem_cache_create(ntfs_inode_cache_name, | |
3086 | sizeof(ntfs_inode), 0, | |
3087 | SLAB_RECLAIM_ACCOUNT, NULL, NULL); | |
3088 | if (!ntfs_inode_cache) { | |
3089 | printk(KERN_CRIT "NTFS: Failed to create %s!\n", | |
3090 | ntfs_inode_cache_name); | |
3091 | goto inode_err_out; | |
3092 | } | |
3093 | ||
3094 | ntfs_big_inode_cache = kmem_cache_create(ntfs_big_inode_cache_name, | |
3095 | sizeof(big_ntfs_inode), 0, | |
3096 | SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT, | |
3097 | ntfs_big_inode_init_once, NULL); | |
3098 | if (!ntfs_big_inode_cache) { | |
3099 | printk(KERN_CRIT "NTFS: Failed to create %s!\n", | |
3100 | ntfs_big_inode_cache_name); | |
3101 | goto big_inode_err_out; | |
3102 | } | |
3103 | ||
3104 | /* Register the ntfs sysctls. */ | |
3105 | err = ntfs_sysctl(1); | |
3106 | if (err) { | |
3107 | printk(KERN_CRIT "NTFS: Failed to register NTFS sysctls!\n"); | |
3108 | goto sysctl_err_out; | |
3109 | } | |
3110 | ||
3111 | err = register_filesystem(&ntfs_fs_type); | |
3112 | if (!err) { | |
3113 | ntfs_debug("NTFS driver registered successfully."); | |
3114 | return 0; /* Success! */ | |
3115 | } | |
c002f425 | 3116 | printk(KERN_CRIT "NTFS: Failed to register NTFS filesystem driver!\n"); |
1da177e4 LT |
3117 | |
3118 | sysctl_err_out: | |
3119 | kmem_cache_destroy(ntfs_big_inode_cache); | |
3120 | big_inode_err_out: | |
3121 | kmem_cache_destroy(ntfs_inode_cache); | |
3122 | inode_err_out: | |
3123 | kmem_cache_destroy(ntfs_name_cache); | |
3124 | name_err_out: | |
3125 | kmem_cache_destroy(ntfs_attr_ctx_cache); | |
3126 | actx_err_out: | |
3127 | kmem_cache_destroy(ntfs_index_ctx_cache); | |
3128 | ictx_err_out: | |
3129 | if (!err) { | |
c002f425 | 3130 | printk(KERN_CRIT "NTFS: Aborting NTFS filesystem driver " |
1da177e4 LT |
3131 | "registration...\n"); |
3132 | err = -ENOMEM; | |
3133 | } | |
3134 | return err; | |
3135 | } | |
3136 | ||
3137 | static void __exit exit_ntfs_fs(void) | |
3138 | { | |
3139 | int err = 0; | |
3140 | ||
3141 | ntfs_debug("Unregistering NTFS driver."); | |
3142 | ||
3143 | unregister_filesystem(&ntfs_fs_type); | |
3144 | ||
3145 | if (kmem_cache_destroy(ntfs_big_inode_cache) && (err = 1)) | |
3146 | printk(KERN_CRIT "NTFS: Failed to destory %s.\n", | |
3147 | ntfs_big_inode_cache_name); | |
3148 | if (kmem_cache_destroy(ntfs_inode_cache) && (err = 1)) | |
3149 | printk(KERN_CRIT "NTFS: Failed to destory %s.\n", | |
3150 | ntfs_inode_cache_name); | |
3151 | if (kmem_cache_destroy(ntfs_name_cache) && (err = 1)) | |
3152 | printk(KERN_CRIT "NTFS: Failed to destory %s.\n", | |
3153 | ntfs_name_cache_name); | |
3154 | if (kmem_cache_destroy(ntfs_attr_ctx_cache) && (err = 1)) | |
3155 | printk(KERN_CRIT "NTFS: Failed to destory %s.\n", | |
3156 | ntfs_attr_ctx_cache_name); | |
3157 | if (kmem_cache_destroy(ntfs_index_ctx_cache) && (err = 1)) | |
3158 | printk(KERN_CRIT "NTFS: Failed to destory %s.\n", | |
3159 | ntfs_index_ctx_cache_name); | |
3160 | if (err) | |
3161 | printk(KERN_CRIT "NTFS: This causes memory to leak! There is " | |
3162 | "probably a BUG in the driver! Please report " | |
3163 | "you saw this message to " | |
3164 | "linux-ntfs-dev@lists.sourceforge.net\n"); | |
3165 | /* Unregister the ntfs sysctls. */ | |
3166 | ntfs_sysctl(0); | |
3167 | } | |
3168 | ||
3169 | MODULE_AUTHOR("Anton Altaparmakov <aia21@cantab.net>"); | |
c002f425 | 3170 | MODULE_DESCRIPTION("NTFS 1.2/3.x driver - Copyright (c) 2001-2005 Anton Altaparmakov"); |
1da177e4 LT |
3171 | MODULE_VERSION(NTFS_VERSION); |
3172 | MODULE_LICENSE("GPL"); | |
3173 | #ifdef DEBUG | |
3174 | module_param(debug_msgs, bool, 0); | |
3175 | MODULE_PARM_DESC(debug_msgs, "Enable debug messages."); | |
3176 | #endif | |
3177 | ||
3178 | module_init(init_ntfs_fs) | |
3179 | module_exit(exit_ntfs_fs) |