2 * super.c - NTFS kernel super block handling. Part of the Linux-NTFS project.
4 * Copyright (c) 2001-2005 Anton Altaparmakov
5 * Copyright (c) 2001,2002 Richard Russon
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.
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.
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
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>
45 /* Number of mounted filesystems which have compression enabled. */
46 static unsigned long ntfs_nr_compression_users;
48 /* A global default upcase table and a corresponding reference count. */
49 static ntfschar *default_upcase = NULL;
50 static unsigned long ntfs_nr_upcase_users = 0;
52 /* Error constants/strings used in inode.c::ntfs_show_options(). */
54 /* One of these must be present, default is ON_ERRORS_CONTINUE. */
55 ON_ERRORS_PANIC = 0x01,
56 ON_ERRORS_REMOUNT_RO = 0x02,
57 ON_ERRORS_CONTINUE = 0x04,
58 /* Optional, can be combined with any of the above. */
59 ON_ERRORS_RECOVER = 0x10,
62 const option_t on_errors_arr[] = {
63 { ON_ERRORS_PANIC, "panic" },
64 { ON_ERRORS_REMOUNT_RO, "remount-ro", },
65 { ON_ERRORS_CONTINUE, "continue", },
66 { ON_ERRORS_RECOVER, "recover" },
73 * Copied from old ntfs driver (which copied from vfat driver).
75 static int simple_getbool(char *s, BOOL *setval)
78 if (!strcmp(s, "1") || !strcmp(s, "yes") || !strcmp(s, "true"))
80 else if (!strcmp(s, "0") || !strcmp(s, "no") ||
91 * parse_options - parse the (re)mount options
93 * @opt: string containing the (re)mount options
95 * Parse the recognized options in @opt for the ntfs volume described by @vol.
97 static BOOL parse_options(ntfs_volume *vol, char *opt)
100 static char *utf8 = "utf8";
101 int errors = 0, sloppy = 0;
102 uid_t uid = (uid_t)-1;
103 gid_t gid = (gid_t)-1;
104 mode_t fmask = (mode_t)-1, dmask = (mode_t)-1;
105 int mft_zone_multiplier = -1, on_errors = -1;
106 int show_sys_files = -1, case_sensitive = -1, disable_sparse = -1;
107 struct nls_table *nls_map = NULL, *old_nls;
109 /* I am lazy... (-8 */
110 #define NTFS_GETOPT_WITH_DEFAULT(option, variable, default_value) \
111 if (!strcmp(p, option)) { \
113 variable = default_value; \
115 variable = simple_strtoul(ov = v, &v, 0); \
120 #define NTFS_GETOPT(option, variable) \
121 if (!strcmp(p, option)) { \
124 variable = simple_strtoul(ov = v, &v, 0); \
128 #define NTFS_GETOPT_BOOL(option, variable) \
129 if (!strcmp(p, option)) { \
131 if (!simple_getbool(v, &val)) \
135 #define NTFS_GETOPT_OPTIONS_ARRAY(option, variable, opt_array) \
136 if (!strcmp(p, option)) { \
141 if (variable == -1) \
143 for (_i = 0; opt_array[_i].str && *opt_array[_i].str; _i++) \
144 if (!strcmp(opt_array[_i].str, v)) { \
145 variable |= opt_array[_i].val; \
148 if (!opt_array[_i].str || !*opt_array[_i].str) \
152 goto no_mount_options;
153 ntfs_debug("Entering with mount options string: %s", opt);
154 while ((p = strsep(&opt, ","))) {
155 if ((v = strchr(p, '=')))
157 NTFS_GETOPT("uid", uid)
158 else NTFS_GETOPT("gid", gid)
159 else NTFS_GETOPT("umask", fmask = dmask)
160 else NTFS_GETOPT("fmask", fmask)
161 else NTFS_GETOPT("dmask", dmask)
162 else NTFS_GETOPT("mft_zone_multiplier", mft_zone_multiplier)
163 else NTFS_GETOPT_WITH_DEFAULT("sloppy", sloppy, TRUE)
164 else NTFS_GETOPT_BOOL("show_sys_files", show_sys_files)
165 else NTFS_GETOPT_BOOL("case_sensitive", case_sensitive)
166 else NTFS_GETOPT_BOOL("disable_sparse", disable_sparse)
167 else NTFS_GETOPT_OPTIONS_ARRAY("errors", on_errors,
169 else if (!strcmp(p, "posix") || !strcmp(p, "show_inodes"))
170 ntfs_warning(vol->sb, "Ignoring obsolete option %s.",
172 else if (!strcmp(p, "nls") || !strcmp(p, "iocharset")) {
173 if (!strcmp(p, "iocharset"))
174 ntfs_warning(vol->sb, "Option iocharset is "
175 "deprecated. Please use "
176 "option nls=<charsetname> in "
182 nls_map = load_nls(v);
185 ntfs_error(vol->sb, "NLS character set "
189 ntfs_error(vol->sb, "NLS character set %s not "
190 "found. Using previous one %s.",
191 v, old_nls->charset);
193 } else /* nls_map */ {
197 } else if (!strcmp(p, "utf8")) {
199 ntfs_warning(vol->sb, "Option utf8 is no longer "
200 "supported, using option nls=utf8. Please "
201 "use option nls=utf8 in the future and "
202 "make sure utf8 is compiled either as a "
203 "module or into the kernel.");
206 else if (!simple_getbool(v, &val))
213 ntfs_error(vol->sb, "Unrecognized mount option %s.", p);
214 if (errors < INT_MAX)
217 #undef NTFS_GETOPT_OPTIONS_ARRAY
218 #undef NTFS_GETOPT_BOOL
220 #undef NTFS_GETOPT_WITH_DEFAULT
223 if (errors && !sloppy)
226 ntfs_warning(vol->sb, "Sloppy option given. Ignoring "
227 "unrecognized mount option(s) and continuing.");
228 /* Keep this first! */
229 if (on_errors != -1) {
231 ntfs_error(vol->sb, "Invalid errors option argument "
232 "or bug in options parser.");
237 if (vol->nls_map && vol->nls_map != nls_map) {
238 ntfs_error(vol->sb, "Cannot change NLS character set "
241 } /* else (!vol->nls_map) */
242 ntfs_debug("Using NLS character set %s.", nls_map->charset);
243 vol->nls_map = nls_map;
244 } else /* (!nls_map) */ {
246 vol->nls_map = load_nls_default();
248 ntfs_error(vol->sb, "Failed to load default "
249 "NLS character set.");
252 ntfs_debug("Using default NLS character set (%s).",
253 vol->nls_map->charset);
256 if (mft_zone_multiplier != -1) {
257 if (vol->mft_zone_multiplier && vol->mft_zone_multiplier !=
258 mft_zone_multiplier) {
259 ntfs_error(vol->sb, "Cannot change mft_zone_multiplier "
263 if (mft_zone_multiplier < 1 || mft_zone_multiplier > 4) {
264 ntfs_error(vol->sb, "Invalid mft_zone_multiplier. "
265 "Using default value, i.e. 1.");
266 mft_zone_multiplier = 1;
268 vol->mft_zone_multiplier = mft_zone_multiplier;
270 if (!vol->mft_zone_multiplier)
271 vol->mft_zone_multiplier = 1;
273 vol->on_errors = on_errors;
274 if (!vol->on_errors || vol->on_errors == ON_ERRORS_RECOVER)
275 vol->on_errors |= ON_ERRORS_CONTINUE;
276 if (uid != (uid_t)-1)
278 if (gid != (gid_t)-1)
280 if (fmask != (mode_t)-1)
282 if (dmask != (mode_t)-1)
284 if (show_sys_files != -1) {
286 NVolSetShowSystemFiles(vol);
288 NVolClearShowSystemFiles(vol);
290 if (case_sensitive != -1) {
292 NVolSetCaseSensitive(vol);
294 NVolClearCaseSensitive(vol);
296 if (disable_sparse != -1) {
298 NVolClearSparseEnabled(vol);
300 if (!NVolSparseEnabled(vol) &&
301 vol->major_ver && vol->major_ver < 3)
302 ntfs_warning(vol->sb, "Not enabling sparse "
303 "support due to NTFS volume "
304 "version %i.%i (need at least "
305 "version 3.0).", vol->major_ver,
308 NVolSetSparseEnabled(vol);
313 ntfs_error(vol->sb, "The %s option requires an argument.", p);
316 ntfs_error(vol->sb, "The %s option requires a boolean argument.", p);
319 ntfs_error(vol->sb, "Invalid %s option argument: %s", p, ov);
326 * ntfs_write_volume_flags - write new flags to the volume information flags
327 * @vol: ntfs volume on which to modify the flags
328 * @flags: new flags value for the volume information flags
330 * Internal function. You probably want to use ntfs_{set,clear}_volume_flags()
331 * instead (see below).
333 * Replace the volume information flags on the volume @vol with the value
334 * supplied in @flags. Note, this overwrites the volume information flags, so
335 * make sure to combine the flags you want to modify with the old flags and use
336 * the result when calling ntfs_write_volume_flags().
338 * Return 0 on success and -errno on error.
340 static int ntfs_write_volume_flags(ntfs_volume *vol, const VOLUME_FLAGS flags)
342 ntfs_inode *ni = NTFS_I(vol->vol_ino);
344 VOLUME_INFORMATION *vi;
345 ntfs_attr_search_ctx *ctx;
348 ntfs_debug("Entering, old flags = 0x%x, new flags = 0x%x.",
349 le16_to_cpu(vol->vol_flags), le16_to_cpu(flags));
350 if (vol->vol_flags == flags)
353 m = map_mft_record(ni);
358 ctx = ntfs_attr_get_search_ctx(ni, m);
361 goto put_unm_err_out;
363 err = ntfs_attr_lookup(AT_VOLUME_INFORMATION, NULL, 0, 0, 0, NULL, 0,
366 goto put_unm_err_out;
367 vi = (VOLUME_INFORMATION*)((u8*)ctx->attr +
368 le16_to_cpu(ctx->attr->data.resident.value_offset));
369 vol->vol_flags = vi->flags = flags;
370 flush_dcache_mft_record_page(ctx->ntfs_ino);
371 mark_mft_record_dirty(ctx->ntfs_ino);
372 ntfs_attr_put_search_ctx(ctx);
373 unmap_mft_record(ni);
379 ntfs_attr_put_search_ctx(ctx);
380 unmap_mft_record(ni);
382 ntfs_error(vol->sb, "Failed with error code %i.", -err);
387 * ntfs_set_volume_flags - set bits in the volume information flags
388 * @vol: ntfs volume on which to modify the flags
389 * @flags: flags to set on the volume
391 * Set the bits in @flags in the volume information flags on the volume @vol.
393 * Return 0 on success and -errno on error.
395 static inline int ntfs_set_volume_flags(ntfs_volume *vol, VOLUME_FLAGS flags)
397 flags &= VOLUME_FLAGS_MASK;
398 return ntfs_write_volume_flags(vol, vol->vol_flags | flags);
402 * ntfs_clear_volume_flags - clear bits in the volume information flags
403 * @vol: ntfs volume on which to modify the flags
404 * @flags: flags to clear on the volume
406 * Clear the bits in @flags in the volume information flags on the volume @vol.
408 * Return 0 on success and -errno on error.
410 static inline int ntfs_clear_volume_flags(ntfs_volume *vol, VOLUME_FLAGS flags)
412 flags &= VOLUME_FLAGS_MASK;
413 flags = vol->vol_flags & cpu_to_le16(~le16_to_cpu(flags));
414 return ntfs_write_volume_flags(vol, flags);
420 * ntfs_remount - change the mount options of a mounted ntfs filesystem
421 * @sb: superblock of mounted ntfs filesystem
422 * @flags: remount flags
423 * @opt: remount options string
425 * Change the mount options of an already mounted ntfs filesystem.
427 * NOTE: The VFS sets the @sb->s_flags remount flags to @flags after
428 * ntfs_remount() returns successfully (i.e. returns 0). Otherwise,
429 * @sb->s_flags are not changed.
431 static int ntfs_remount(struct super_block *sb, int *flags, char *opt)
433 ntfs_volume *vol = NTFS_SB(sb);
435 ntfs_debug("Entering with remount options string: %s", opt);
437 /* For read-only compiled driver, enforce all read-only flags. */
438 *flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME;
441 * For the read-write compiled driver, if we are remounting read-write,
442 * make sure there are no volume errors and that no unsupported volume
443 * flags are set. Also, empty the logfile journal as it would become
444 * stale as soon as something is written to the volume and mark the
445 * volume dirty so that chkdsk is run if the volume is not umounted
446 * cleanly. Finally, mark the quotas out of date so Windows rescans
447 * the volume on boot and updates them.
449 * When remounting read-only, mark the volume clean if no volume errors
452 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
453 static const char *es = ". Cannot remount read-write.";
455 /* Remounting read-write. */
456 if (NVolErrors(vol)) {
457 ntfs_error(sb, "Volume has errors and is read-only%s",
461 if (vol->vol_flags & VOLUME_IS_DIRTY) {
462 ntfs_error(sb, "Volume is dirty and read-only%s", es);
465 if (vol->vol_flags & VOLUME_MUST_MOUNT_RO_MASK) {
466 ntfs_error(sb, "Volume has unsupported flags set and "
467 "is read-only%s", es);
470 if (ntfs_set_volume_flags(vol, VOLUME_IS_DIRTY)) {
471 ntfs_error(sb, "Failed to set dirty bit in volume "
472 "information flags%s", es);
476 // TODO: Enable this code once we start modifying anything that
477 // is different between NTFS 1.2 and 3.x...
478 /* Set NT4 compatibility flag on newer NTFS version volumes. */
479 if ((vol->major_ver > 1)) {
480 if (ntfs_set_volume_flags(vol, VOLUME_MOUNTED_ON_NT4)) {
481 ntfs_error(sb, "Failed to set NT4 "
482 "compatibility flag%s", es);
488 if (!ntfs_empty_logfile(vol->logfile_ino)) {
489 ntfs_error(sb, "Failed to empty journal $LogFile%s",
494 if (!ntfs_mark_quotas_out_of_date(vol)) {
495 ntfs_error(sb, "Failed to mark quotas out of date%s",
500 } else if (!(sb->s_flags & MS_RDONLY) && (*flags & MS_RDONLY)) {
501 /* Remounting read-only. */
502 if (!NVolErrors(vol)) {
503 if (ntfs_clear_volume_flags(vol, VOLUME_IS_DIRTY))
504 ntfs_warning(sb, "Failed to clear dirty bit "
505 "in volume information "
506 "flags. Run chkdsk.");
511 // TODO: Deal with *flags.
513 if (!parse_options(vol, opt))
520 * is_boot_sector_ntfs - check whether a boot sector is a valid NTFS boot sector
521 * @sb: Super block of the device to which @b belongs.
522 * @b: Boot sector of device @sb to check.
523 * @silent: If TRUE, all output will be silenced.
525 * is_boot_sector_ntfs() checks whether the boot sector @b is a valid NTFS boot
526 * sector. Returns TRUE if it is valid and FALSE if not.
528 * @sb is only needed for warning/error output, i.e. it can be NULL when silent
531 static BOOL is_boot_sector_ntfs(const struct super_block *sb,
532 const NTFS_BOOT_SECTOR *b, const BOOL silent)
535 * Check that checksum == sum of u32 values from b to the checksum
536 * field. If checksum is zero, no checking is done. We will work when
537 * the checksum test fails, since some utilities update the boot sector
538 * ignoring the checksum which leaves the checksum out-of-date. We
539 * report a warning if this is the case.
541 if ((void*)b < (void*)&b->checksum && b->checksum && !silent) {
545 for (i = 0, u = (le32*)b; u < (le32*)(&b->checksum); ++u)
546 i += le32_to_cpup(u);
547 if (le32_to_cpu(b->checksum) != i)
548 ntfs_warning(sb, "Invalid boot sector checksum.");
550 /* Check OEMidentifier is "NTFS " */
551 if (b->oem_id != magicNTFS)
553 /* Check bytes per sector value is between 256 and 4096. */
554 if (le16_to_cpu(b->bpb.bytes_per_sector) < 0x100 ||
555 le16_to_cpu(b->bpb.bytes_per_sector) > 0x1000)
557 /* Check sectors per cluster value is valid. */
558 switch (b->bpb.sectors_per_cluster) {
559 case 1: case 2: case 4: case 8: case 16: case 32: case 64: case 128:
564 /* Check the cluster size is not above the maximum (64kiB). */
565 if ((u32)le16_to_cpu(b->bpb.bytes_per_sector) *
566 b->bpb.sectors_per_cluster > NTFS_MAX_CLUSTER_SIZE)
568 /* Check reserved/unused fields are really zero. */
569 if (le16_to_cpu(b->bpb.reserved_sectors) ||
570 le16_to_cpu(b->bpb.root_entries) ||
571 le16_to_cpu(b->bpb.sectors) ||
572 le16_to_cpu(b->bpb.sectors_per_fat) ||
573 le32_to_cpu(b->bpb.large_sectors) || b->bpb.fats)
575 /* Check clusters per file mft record value is valid. */
576 if ((u8)b->clusters_per_mft_record < 0xe1 ||
577 (u8)b->clusters_per_mft_record > 0xf7)
578 switch (b->clusters_per_mft_record) {
579 case 1: case 2: case 4: case 8: case 16: case 32: case 64:
584 /* Check clusters per index block value is valid. */
585 if ((u8)b->clusters_per_index_record < 0xe1 ||
586 (u8)b->clusters_per_index_record > 0xf7)
587 switch (b->clusters_per_index_record) {
588 case 1: case 2: case 4: case 8: case 16: case 32: case 64:
594 * Check for valid end of sector marker. We will work without it, but
595 * many BIOSes will refuse to boot from a bootsector if the magic is
596 * incorrect, so we emit a warning.
598 if (!silent && b->end_of_sector_marker != const_cpu_to_le16(0xaa55))
599 ntfs_warning(sb, "Invalid end of sector marker.");
606 * read_ntfs_boot_sector - read the NTFS boot sector of a device
607 * @sb: super block of device to read the boot sector from
608 * @silent: if true, suppress all output
610 * Reads the boot sector from the device and validates it. If that fails, tries
611 * to read the backup boot sector, first from the end of the device a-la NT4 and
612 * later and then from the middle of the device a-la NT3.51 and before.
614 * If a valid boot sector is found but it is not the primary boot sector, we
615 * repair the primary boot sector silently (unless the device is read-only or
616 * the primary boot sector is not accessible).
618 * NOTE: To call this function, @sb must have the fields s_dev, the ntfs super
619 * block (u.ntfs_sb), nr_blocks and the device flags (s_flags) initialized
620 * to their respective values.
622 * Return the unlocked buffer head containing the boot sector or NULL on error.
624 static struct buffer_head *read_ntfs_boot_sector(struct super_block *sb,
627 const char *read_err_str = "Unable to read %s boot sector.";
628 struct buffer_head *bh_primary, *bh_backup;
629 long nr_blocks = NTFS_SB(sb)->nr_blocks;
631 /* Try to read primary boot sector. */
632 if ((bh_primary = sb_bread(sb, 0))) {
633 if (is_boot_sector_ntfs(sb, (NTFS_BOOT_SECTOR*)
634 bh_primary->b_data, silent))
637 ntfs_error(sb, "Primary boot sector is invalid.");
639 ntfs_error(sb, read_err_str, "primary");
640 if (!(NTFS_SB(sb)->on_errors & ON_ERRORS_RECOVER)) {
644 ntfs_error(sb, "Mount option errors=recover not used. "
645 "Aborting without trying to recover.");
648 /* Try to read NT4+ backup boot sector. */
649 if ((bh_backup = sb_bread(sb, nr_blocks - 1))) {
650 if (is_boot_sector_ntfs(sb, (NTFS_BOOT_SECTOR*)
651 bh_backup->b_data, silent))
652 goto hotfix_primary_boot_sector;
655 ntfs_error(sb, read_err_str, "backup");
656 /* Try to read NT3.51- backup boot sector. */
657 if ((bh_backup = sb_bread(sb, nr_blocks >> 1))) {
658 if (is_boot_sector_ntfs(sb, (NTFS_BOOT_SECTOR*)
659 bh_backup->b_data, silent))
660 goto hotfix_primary_boot_sector;
662 ntfs_error(sb, "Could not find a valid backup boot "
666 ntfs_error(sb, read_err_str, "backup");
667 /* We failed. Cleanup and return. */
671 hotfix_primary_boot_sector:
674 * If we managed to read sector zero and the volume is not
675 * read-only, copy the found, valid backup boot sector to the
676 * primary boot sector.
678 if (!(sb->s_flags & MS_RDONLY)) {
679 ntfs_warning(sb, "Hot-fix: Recovering invalid primary "
680 "boot sector from backup copy.");
681 memcpy(bh_primary->b_data, bh_backup->b_data,
683 mark_buffer_dirty(bh_primary);
684 sync_dirty_buffer(bh_primary);
685 if (buffer_uptodate(bh_primary)) {
689 ntfs_error(sb, "Hot-fix: Device write error while "
690 "recovering primary boot sector.");
692 ntfs_warning(sb, "Hot-fix: Recovery of primary boot "
693 "sector failed: Read-only mount.");
697 ntfs_warning(sb, "Using backup boot sector.");
702 * parse_ntfs_boot_sector - parse the boot sector and store the data in @vol
703 * @vol: volume structure to initialise with data from boot sector
704 * @b: boot sector to parse
706 * Parse the ntfs boot sector @b and store all imporant information therein in
707 * the ntfs super block @vol. Return TRUE on success and FALSE on error.
709 static BOOL parse_ntfs_boot_sector(ntfs_volume *vol, const NTFS_BOOT_SECTOR *b)
711 unsigned int sectors_per_cluster_bits, nr_hidden_sects;
712 int clusters_per_mft_record, clusters_per_index_record;
715 vol->sector_size = le16_to_cpu(b->bpb.bytes_per_sector);
716 vol->sector_size_bits = ffs(vol->sector_size) - 1;
717 ntfs_debug("vol->sector_size = %i (0x%x)", vol->sector_size,
719 ntfs_debug("vol->sector_size_bits = %i (0x%x)", vol->sector_size_bits,
720 vol->sector_size_bits);
721 if (vol->sector_size != vol->sb->s_blocksize)
722 ntfs_warning(vol->sb, "The boot sector indicates a sector size "
723 "different from the device sector size.");
724 ntfs_debug("sectors_per_cluster = 0x%x", b->bpb.sectors_per_cluster);
725 sectors_per_cluster_bits = ffs(b->bpb.sectors_per_cluster) - 1;
726 ntfs_debug("sectors_per_cluster_bits = 0x%x",
727 sectors_per_cluster_bits);
728 nr_hidden_sects = le32_to_cpu(b->bpb.hidden_sectors);
729 ntfs_debug("number of hidden sectors = 0x%x", nr_hidden_sects);
730 vol->cluster_size = vol->sector_size << sectors_per_cluster_bits;
731 vol->cluster_size_mask = vol->cluster_size - 1;
732 vol->cluster_size_bits = ffs(vol->cluster_size) - 1;
733 ntfs_debug("vol->cluster_size = %i (0x%x)", vol->cluster_size,
735 ntfs_debug("vol->cluster_size_mask = 0x%x", vol->cluster_size_mask);
736 ntfs_debug("vol->cluster_size_bits = %i (0x%x)",
737 vol->cluster_size_bits, vol->cluster_size_bits);
738 if (vol->sector_size > vol->cluster_size) {
739 ntfs_error(vol->sb, "Sector sizes above the cluster size are "
740 "not supported. Sorry.");
743 if (vol->sb->s_blocksize > vol->cluster_size) {
744 ntfs_error(vol->sb, "Cluster sizes smaller than the device "
745 "sector size are not supported. Sorry.");
748 clusters_per_mft_record = b->clusters_per_mft_record;
749 ntfs_debug("clusters_per_mft_record = %i (0x%x)",
750 clusters_per_mft_record, clusters_per_mft_record);
751 if (clusters_per_mft_record > 0)
752 vol->mft_record_size = vol->cluster_size <<
753 (ffs(clusters_per_mft_record) - 1);
756 * When mft_record_size < cluster_size, clusters_per_mft_record
757 * = -log2(mft_record_size) bytes. mft_record_size normaly is
758 * 1024 bytes, which is encoded as 0xF6 (-10 in decimal).
760 vol->mft_record_size = 1 << -clusters_per_mft_record;
761 vol->mft_record_size_mask = vol->mft_record_size - 1;
762 vol->mft_record_size_bits = ffs(vol->mft_record_size) - 1;
763 ntfs_debug("vol->mft_record_size = %i (0x%x)", vol->mft_record_size,
764 vol->mft_record_size);
765 ntfs_debug("vol->mft_record_size_mask = 0x%x",
766 vol->mft_record_size_mask);
767 ntfs_debug("vol->mft_record_size_bits = %i (0x%x)",
768 vol->mft_record_size_bits, vol->mft_record_size_bits);
770 * We cannot support mft record sizes above the PAGE_CACHE_SIZE since
771 * we store $MFT/$DATA, the table of mft records in the page cache.
773 if (vol->mft_record_size > PAGE_CACHE_SIZE) {
774 ntfs_error(vol->sb, "Mft record size %i (0x%x) exceeds the "
775 "page cache size on your system %lu (0x%lx). "
776 "This is not supported. Sorry.",
777 vol->mft_record_size, vol->mft_record_size,
778 PAGE_CACHE_SIZE, PAGE_CACHE_SIZE);
781 clusters_per_index_record = b->clusters_per_index_record;
782 ntfs_debug("clusters_per_index_record = %i (0x%x)",
783 clusters_per_index_record, clusters_per_index_record);
784 if (clusters_per_index_record > 0)
785 vol->index_record_size = vol->cluster_size <<
786 (ffs(clusters_per_index_record) - 1);
789 * When index_record_size < cluster_size,
790 * clusters_per_index_record = -log2(index_record_size) bytes.
791 * index_record_size normaly equals 4096 bytes, which is
792 * encoded as 0xF4 (-12 in decimal).
794 vol->index_record_size = 1 << -clusters_per_index_record;
795 vol->index_record_size_mask = vol->index_record_size - 1;
796 vol->index_record_size_bits = ffs(vol->index_record_size) - 1;
797 ntfs_debug("vol->index_record_size = %i (0x%x)",
798 vol->index_record_size, vol->index_record_size);
799 ntfs_debug("vol->index_record_size_mask = 0x%x",
800 vol->index_record_size_mask);
801 ntfs_debug("vol->index_record_size_bits = %i (0x%x)",
802 vol->index_record_size_bits,
803 vol->index_record_size_bits);
805 * Get the size of the volume in clusters and check for 64-bit-ness.
806 * Windows currently only uses 32 bits to save the clusters so we do
807 * the same as it is much faster on 32-bit CPUs.
809 ll = sle64_to_cpu(b->number_of_sectors) >> sectors_per_cluster_bits;
810 if ((u64)ll >= 1ULL << 32) {
811 ntfs_error(vol->sb, "Cannot handle 64-bit clusters. Sorry.");
814 vol->nr_clusters = ll;
815 ntfs_debug("vol->nr_clusters = 0x%llx", (long long)vol->nr_clusters);
817 * On an architecture where unsigned long is 32-bits, we restrict the
818 * volume size to 2TiB (2^41). On a 64-bit architecture, the compiler
819 * will hopefully optimize the whole check away.
821 if (sizeof(unsigned long) < 8) {
822 if ((ll << vol->cluster_size_bits) >= (1ULL << 41)) {
823 ntfs_error(vol->sb, "Volume size (%lluTiB) is too "
824 "large for this architecture. "
825 "Maximum supported is 2TiB. Sorry.",
826 (unsigned long long)ll >> (40 -
827 vol->cluster_size_bits));
831 ll = sle64_to_cpu(b->mft_lcn);
832 if (ll >= vol->nr_clusters) {
833 ntfs_error(vol->sb, "MFT LCN is beyond end of volume. Weird.");
837 ntfs_debug("vol->mft_lcn = 0x%llx", (long long)vol->mft_lcn);
838 ll = sle64_to_cpu(b->mftmirr_lcn);
839 if (ll >= vol->nr_clusters) {
840 ntfs_error(vol->sb, "MFTMirr LCN is beyond end of volume. "
844 vol->mftmirr_lcn = ll;
845 ntfs_debug("vol->mftmirr_lcn = 0x%llx", (long long)vol->mftmirr_lcn);
848 * Work out the size of the mft mirror in number of mft records. If the
849 * cluster size is less than or equal to the size taken by four mft
850 * records, the mft mirror stores the first four mft records. If the
851 * cluster size is bigger than the size taken by four mft records, the
852 * mft mirror contains as many mft records as will fit into one
855 if (vol->cluster_size <= (4 << vol->mft_record_size_bits))
856 vol->mftmirr_size = 4;
858 vol->mftmirr_size = vol->cluster_size >>
859 vol->mft_record_size_bits;
860 ntfs_debug("vol->mftmirr_size = %i", vol->mftmirr_size);
862 vol->serial_no = le64_to_cpu(b->volume_serial_number);
863 ntfs_debug("vol->serial_no = 0x%llx",
864 (unsigned long long)vol->serial_no);
869 * ntfs_setup_allocators - initialize the cluster and mft allocators
870 * @vol: volume structure for which to setup the allocators
872 * Setup the cluster (lcn) and mft allocators to the starting values.
874 static void ntfs_setup_allocators(ntfs_volume *vol)
877 LCN mft_zone_size, mft_lcn;
880 ntfs_debug("vol->mft_zone_multiplier = 0x%x",
881 vol->mft_zone_multiplier);
883 /* Determine the size of the MFT zone. */
884 mft_zone_size = vol->nr_clusters;
885 switch (vol->mft_zone_multiplier) { /* % of volume size in clusters */
887 mft_zone_size >>= 1; /* 50% */
890 mft_zone_size = (mft_zone_size +
891 (mft_zone_size >> 1)) >> 2; /* 37.5% */
894 mft_zone_size >>= 2; /* 25% */
898 mft_zone_size >>= 3; /* 12.5% */
901 /* Setup the mft zone. */
902 vol->mft_zone_start = vol->mft_zone_pos = vol->mft_lcn;
903 ntfs_debug("vol->mft_zone_pos = 0x%llx",
904 (unsigned long long)vol->mft_zone_pos);
906 * Calculate the mft_lcn for an unmodified NTFS volume (see mkntfs
907 * source) and if the actual mft_lcn is in the expected place or even
908 * further to the front of the volume, extend the mft_zone to cover the
909 * beginning of the volume as well. This is in order to protect the
910 * area reserved for the mft bitmap as well within the mft_zone itself.
911 * On non-standard volumes we do not protect it as the overhead would
912 * be higher than the speed increase we would get by doing it.
914 mft_lcn = (8192 + 2 * vol->cluster_size - 1) / vol->cluster_size;
915 if (mft_lcn * vol->cluster_size < 16 * 1024)
916 mft_lcn = (16 * 1024 + vol->cluster_size - 1) /
918 if (vol->mft_zone_start <= mft_lcn)
919 vol->mft_zone_start = 0;
920 ntfs_debug("vol->mft_zone_start = 0x%llx",
921 (unsigned long long)vol->mft_zone_start);
923 * Need to cap the mft zone on non-standard volumes so that it does
924 * not point outside the boundaries of the volume. We do this by
925 * halving the zone size until we are inside the volume.
927 vol->mft_zone_end = vol->mft_lcn + mft_zone_size;
928 while (vol->mft_zone_end >= vol->nr_clusters) {
930 vol->mft_zone_end = vol->mft_lcn + mft_zone_size;
932 ntfs_debug("vol->mft_zone_end = 0x%llx",
933 (unsigned long long)vol->mft_zone_end);
935 * Set the current position within each data zone to the start of the
938 vol->data1_zone_pos = vol->mft_zone_end;
939 ntfs_debug("vol->data1_zone_pos = 0x%llx",
940 (unsigned long long)vol->data1_zone_pos);
941 vol->data2_zone_pos = 0;
942 ntfs_debug("vol->data2_zone_pos = 0x%llx",
943 (unsigned long long)vol->data2_zone_pos);
945 /* Set the mft data allocation position to mft record 24. */
946 vol->mft_data_pos = 24;
947 ntfs_debug("vol->mft_data_pos = 0x%llx",
948 (unsigned long long)vol->mft_data_pos);
955 * load_and_init_mft_mirror - load and setup the mft mirror inode for a volume
956 * @vol: ntfs super block describing device whose mft mirror to load
958 * Return TRUE on success or FALSE on error.
960 static BOOL load_and_init_mft_mirror(ntfs_volume *vol)
962 struct inode *tmp_ino;
965 ntfs_debug("Entering.");
966 /* Get mft mirror inode. */
967 tmp_ino = ntfs_iget(vol->sb, FILE_MFTMirr);
968 if (IS_ERR(tmp_ino) || is_bad_inode(tmp_ino)) {
969 if (!IS_ERR(tmp_ino))
971 /* Caller will display error message. */
975 * Re-initialize some specifics about $MFTMirr's inode as
976 * ntfs_read_inode() will have set up the default ones.
978 /* Set uid and gid to root. */
979 tmp_ino->i_uid = tmp_ino->i_gid = 0;
980 /* Regular file. No access for anyone. */
981 tmp_ino->i_mode = S_IFREG;
982 /* No VFS initiated operations allowed for $MFTMirr. */
983 tmp_ino->i_op = &ntfs_empty_inode_ops;
984 tmp_ino->i_fop = &ntfs_empty_file_ops;
985 /* Put in our special address space operations. */
986 tmp_ino->i_mapping->a_ops = &ntfs_mst_aops;
987 tmp_ni = NTFS_I(tmp_ino);
988 /* The $MFTMirr, like the $MFT is multi sector transfer protected. */
989 NInoSetMstProtected(tmp_ni);
990 NInoSetSparseDisabled(tmp_ni);
992 * Set up our little cheat allowing us to reuse the async read io
993 * completion handler for directories.
995 tmp_ni->itype.index.block_size = vol->mft_record_size;
996 tmp_ni->itype.index.block_size_bits = vol->mft_record_size_bits;
997 vol->mftmirr_ino = tmp_ino;
1003 * check_mft_mirror - compare contents of the mft mirror with the mft
1004 * @vol: ntfs super block describing device whose mft mirror to check
1006 * Return TRUE on success or FALSE on error.
1008 * Note, this function also results in the mft mirror runlist being completely
1009 * mapped into memory. The mft mirror write code requires this and will BUG()
1010 * should it find an unmapped runlist element.
1012 static BOOL check_mft_mirror(ntfs_volume *vol)
1014 struct super_block *sb = vol->sb;
1015 ntfs_inode *mirr_ni;
1016 struct page *mft_page, *mirr_page;
1018 runlist_element *rl, rl2[2];
1020 int mrecs_per_page, i;
1022 ntfs_debug("Entering.");
1023 /* Compare contents of $MFT and $MFTMirr. */
1024 mrecs_per_page = PAGE_CACHE_SIZE / vol->mft_record_size;
1025 BUG_ON(!mrecs_per_page);
1026 BUG_ON(!vol->mftmirr_size);
1027 mft_page = mirr_page = NULL;
1028 kmft = kmirr = NULL;
1033 /* Switch pages if necessary. */
1034 if (!(i % mrecs_per_page)) {
1036 ntfs_unmap_page(mft_page);
1037 ntfs_unmap_page(mirr_page);
1039 /* Get the $MFT page. */
1040 mft_page = ntfs_map_page(vol->mft_ino->i_mapping,
1042 if (IS_ERR(mft_page)) {
1043 ntfs_error(sb, "Failed to read $MFT.");
1046 kmft = page_address(mft_page);
1047 /* Get the $MFTMirr page. */
1048 mirr_page = ntfs_map_page(vol->mftmirr_ino->i_mapping,
1050 if (IS_ERR(mirr_page)) {
1051 ntfs_error(sb, "Failed to read $MFTMirr.");
1054 kmirr = page_address(mirr_page);
1057 /* Make sure the record is ok. */
1058 if (ntfs_is_baad_recordp((le32*)kmft)) {
1059 ntfs_error(sb, "Incomplete multi sector transfer "
1060 "detected in mft record %i.", i);
1062 ntfs_unmap_page(mirr_page);
1064 ntfs_unmap_page(mft_page);
1067 if (ntfs_is_baad_recordp((le32*)kmirr)) {
1068 ntfs_error(sb, "Incomplete multi sector transfer "
1069 "detected in mft mirror record %i.", i);
1072 /* Get the amount of data in the current record. */
1073 bytes = le32_to_cpu(((MFT_RECORD*)kmft)->bytes_in_use);
1074 if (!bytes || bytes > vol->mft_record_size) {
1075 bytes = le32_to_cpu(((MFT_RECORD*)kmirr)->bytes_in_use);
1076 if (!bytes || bytes > vol->mft_record_size)
1077 bytes = vol->mft_record_size;
1079 /* Compare the two records. */
1080 if (memcmp(kmft, kmirr, bytes)) {
1081 ntfs_error(sb, "$MFT and $MFTMirr (record %i) do not "
1082 "match. Run ntfsfix or chkdsk.", i);
1085 kmft += vol->mft_record_size;
1086 kmirr += vol->mft_record_size;
1087 } while (++i < vol->mftmirr_size);
1088 /* Release the last pages. */
1089 ntfs_unmap_page(mft_page);
1090 ntfs_unmap_page(mirr_page);
1092 /* Construct the mft mirror runlist by hand. */
1094 rl2[0].lcn = vol->mftmirr_lcn;
1095 rl2[0].length = (vol->mftmirr_size * vol->mft_record_size +
1096 vol->cluster_size - 1) / vol->cluster_size;
1097 rl2[1].vcn = rl2[0].length;
1098 rl2[1].lcn = LCN_ENOENT;
1101 * Because we have just read all of the mft mirror, we know we have
1102 * mapped the full runlist for it.
1104 mirr_ni = NTFS_I(vol->mftmirr_ino);
1105 down_read(&mirr_ni->runlist.lock);
1106 rl = mirr_ni->runlist.rl;
1107 /* Compare the two runlists. They must be identical. */
1110 if (rl2[i].vcn != rl[i].vcn || rl2[i].lcn != rl[i].lcn ||
1111 rl2[i].length != rl[i].length) {
1112 ntfs_error(sb, "$MFTMirr location mismatch. "
1114 up_read(&mirr_ni->runlist.lock);
1117 } while (rl2[i++].length);
1118 up_read(&mirr_ni->runlist.lock);
1119 ntfs_debug("Done.");
1124 * load_and_check_logfile - load and check the logfile inode for a volume
1125 * @vol: ntfs super block describing device whose logfile to load
1127 * Return TRUE on success or FALSE on error.
1129 static BOOL load_and_check_logfile(ntfs_volume *vol)
1131 struct inode *tmp_ino;
1133 ntfs_debug("Entering.");
1134 tmp_ino = ntfs_iget(vol->sb, FILE_LogFile);
1135 if (IS_ERR(tmp_ino) || is_bad_inode(tmp_ino)) {
1136 if (!IS_ERR(tmp_ino))
1138 /* Caller will display error message. */
1141 if (!ntfs_check_logfile(tmp_ino)) {
1143 /* ntfs_check_logfile() will have displayed error output. */
1146 NInoSetSparseDisabled(NTFS_I(tmp_ino));
1147 vol->logfile_ino = tmp_ino;
1148 ntfs_debug("Done.");
1153 * load_and_init_quota - load and setup the quota file for a volume if present
1154 * @vol: ntfs super block describing device whose quota file to load
1156 * Return TRUE on success or FALSE on error. If $Quota is not present, we
1157 * leave vol->quota_ino as NULL and return success.
1159 static BOOL load_and_init_quota(ntfs_volume *vol)
1162 struct inode *tmp_ino;
1163 ntfs_name *name = NULL;
1164 static const ntfschar Quota[7] = { const_cpu_to_le16('$'),
1165 const_cpu_to_le16('Q'), const_cpu_to_le16('u'),
1166 const_cpu_to_le16('o'), const_cpu_to_le16('t'),
1167 const_cpu_to_le16('a'), 0 };
1168 static ntfschar Q[3] = { const_cpu_to_le16('$'),
1169 const_cpu_to_le16('Q'), 0 };
1171 ntfs_debug("Entering.");
1173 * Find the inode number for the quota file by looking up the filename
1174 * $Quota in the extended system files directory $Extend.
1176 down(&vol->extend_ino->i_sem);
1177 mref = ntfs_lookup_inode_by_name(NTFS_I(vol->extend_ino), Quota, 6,
1179 up(&vol->extend_ino->i_sem);
1180 if (IS_ERR_MREF(mref)) {
1182 * If the file does not exist, quotas are disabled and have
1183 * never been enabled on this volume, just return success.
1185 if (MREF_ERR(mref) == -ENOENT) {
1186 ntfs_debug("$Quota not present. Volume does not have "
1189 * No need to try to set quotas out of date if they are
1192 NVolSetQuotaOutOfDate(vol);
1195 /* A real error occured. */
1196 ntfs_error(vol->sb, "Failed to find inode number for $Quota.");
1199 /* We do not care for the type of match that was found. */
1201 /* Get the inode. */
1202 tmp_ino = ntfs_iget(vol->sb, MREF(mref));
1203 if (IS_ERR(tmp_ino) || is_bad_inode(tmp_ino)) {
1204 if (!IS_ERR(tmp_ino))
1206 ntfs_error(vol->sb, "Failed to load $Quota.");
1209 vol->quota_ino = tmp_ino;
1210 /* Get the $Q index allocation attribute. */
1211 tmp_ino = ntfs_index_iget(vol->quota_ino, Q, 2);
1212 if (IS_ERR(tmp_ino)) {
1213 ntfs_error(vol->sb, "Failed to load $Quota/$Q index.");
1216 vol->quota_q_ino = tmp_ino;
1217 ntfs_debug("Done.");
1222 * load_and_init_attrdef - load the attribute definitions table for a volume
1223 * @vol: ntfs super block describing device whose attrdef to load
1225 * Return TRUE on success or FALSE on error.
1227 static BOOL load_and_init_attrdef(ntfs_volume *vol)
1230 struct super_block *sb = vol->sb;
1233 pgoff_t index, max_index;
1236 ntfs_debug("Entering.");
1237 /* Read attrdef table and setup vol->attrdef and vol->attrdef_size. */
1238 ino = ntfs_iget(sb, FILE_AttrDef);
1239 if (IS_ERR(ino) || is_bad_inode(ino)) {
1244 NInoSetSparseDisabled(NTFS_I(ino));
1245 /* The size of FILE_AttrDef must be above 0 and fit inside 31 bits. */
1246 i_size = i_size_read(ino);
1247 if (i_size <= 0 || i_size > 0x7fffffff)
1249 vol->attrdef = (ATTR_DEF*)ntfs_malloc_nofs(i_size);
1253 max_index = i_size >> PAGE_CACHE_SHIFT;
1254 size = PAGE_CACHE_SIZE;
1255 while (index < max_index) {
1256 /* Read the attrdef table and copy it into the linear buffer. */
1257 read_partial_attrdef_page:
1258 page = ntfs_map_page(ino->i_mapping, index);
1260 goto free_iput_failed;
1261 memcpy((u8*)vol->attrdef + (index++ << PAGE_CACHE_SHIFT),
1262 page_address(page), size);
1263 ntfs_unmap_page(page);
1265 if (size == PAGE_CACHE_SIZE) {
1266 size = i_size & ~PAGE_CACHE_MASK;
1268 goto read_partial_attrdef_page;
1270 vol->attrdef_size = i_size;
1271 ntfs_debug("Read %llu bytes from $AttrDef.", i_size);
1275 ntfs_free(vol->attrdef);
1276 vol->attrdef = NULL;
1280 ntfs_error(sb, "Failed to initialize attribute definition table.");
1284 #endif /* NTFS_RW */
1287 * load_and_init_upcase - load the upcase table for an ntfs volume
1288 * @vol: ntfs super block describing device whose upcase to load
1290 * Return TRUE on success or FALSE on error.
1292 static BOOL load_and_init_upcase(ntfs_volume *vol)
1295 struct super_block *sb = vol->sb;
1298 pgoff_t index, max_index;
1302 ntfs_debug("Entering.");
1303 /* Read upcase table and setup vol->upcase and vol->upcase_len. */
1304 ino = ntfs_iget(sb, FILE_UpCase);
1305 if (IS_ERR(ino) || is_bad_inode(ino)) {
1311 * The upcase size must not be above 64k Unicode characters, must not
1312 * be zero and must be a multiple of sizeof(ntfschar).
1314 i_size = i_size_read(ino);
1315 if (!i_size || i_size & (sizeof(ntfschar) - 1) ||
1316 i_size > 64ULL * 1024 * sizeof(ntfschar))
1317 goto iput_upcase_failed;
1318 vol->upcase = (ntfschar*)ntfs_malloc_nofs(i_size);
1320 goto iput_upcase_failed;
1322 max_index = i_size >> PAGE_CACHE_SHIFT;
1323 size = PAGE_CACHE_SIZE;
1324 while (index < max_index) {
1325 /* Read the upcase table and copy it into the linear buffer. */
1326 read_partial_upcase_page:
1327 page = ntfs_map_page(ino->i_mapping, index);
1329 goto iput_upcase_failed;
1330 memcpy((char*)vol->upcase + (index++ << PAGE_CACHE_SHIFT),
1331 page_address(page), size);
1332 ntfs_unmap_page(page);
1334 if (size == PAGE_CACHE_SIZE) {
1335 size = i_size & ~PAGE_CACHE_MASK;
1337 goto read_partial_upcase_page;
1339 vol->upcase_len = i_size >> UCHAR_T_SIZE_BITS;
1340 ntfs_debug("Read %llu bytes from $UpCase (expected %zu bytes).",
1341 i_size, 64 * 1024 * sizeof(ntfschar));
1344 if (!default_upcase) {
1345 ntfs_debug("Using volume specified $UpCase since default is "
1350 max = default_upcase_len;
1351 if (max > vol->upcase_len)
1352 max = vol->upcase_len;
1353 for (i = 0; i < max; i++)
1354 if (vol->upcase[i] != default_upcase[i])
1357 ntfs_free(vol->upcase);
1358 vol->upcase = default_upcase;
1359 vol->upcase_len = max;
1360 ntfs_nr_upcase_users++;
1362 ntfs_debug("Volume specified $UpCase matches default. Using "
1367 ntfs_debug("Using volume specified $UpCase since it does not match "
1372 ntfs_free(vol->upcase);
1376 if (default_upcase) {
1377 vol->upcase = default_upcase;
1378 vol->upcase_len = default_upcase_len;
1379 ntfs_nr_upcase_users++;
1381 ntfs_error(sb, "Failed to load $UpCase from the volume. Using "
1386 ntfs_error(sb, "Failed to initialize upcase table.");
1391 * load_system_files - open the system files using normal functions
1392 * @vol: ntfs super block describing device whose system files to load
1394 * Open the system files with normal access functions and complete setting up
1395 * the ntfs super block @vol.
1397 * Return TRUE on success or FALSE on error.
1399 static BOOL load_system_files(ntfs_volume *vol)
1401 struct super_block *sb = vol->sb;
1403 VOLUME_INFORMATION *vi;
1404 ntfs_attr_search_ctx *ctx;
1406 ntfs_debug("Entering.");
1408 /* Get mft mirror inode compare the contents of $MFT and $MFTMirr. */
1409 if (!load_and_init_mft_mirror(vol) || !check_mft_mirror(vol)) {
1410 static const char *es1 = "Failed to load $MFTMirr";
1411 static const char *es2 = "$MFTMirr does not match $MFT";
1412 static const char *es3 = ". Run ntfsfix and/or chkdsk.";
1414 /* If a read-write mount, convert it to a read-only mount. */
1415 if (!(sb->s_flags & MS_RDONLY)) {
1416 if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO |
1417 ON_ERRORS_CONTINUE))) {
1418 ntfs_error(sb, "%s and neither on_errors="
1419 "continue nor on_errors="
1420 "remount-ro was specified%s",
1421 !vol->mftmirr_ino ? es1 : es2,
1423 goto iput_mirr_err_out;
1425 sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME;
1426 ntfs_error(sb, "%s. Mounting read-only%s",
1427 !vol->mftmirr_ino ? es1 : es2, es3);
1429 ntfs_warning(sb, "%s. Will not be able to remount "
1431 !vol->mftmirr_ino ? es1 : es2, es3);
1432 /* This will prevent a read-write remount. */
1435 #endif /* NTFS_RW */
1436 /* Get mft bitmap attribute inode. */
1437 vol->mftbmp_ino = ntfs_attr_iget(vol->mft_ino, AT_BITMAP, NULL, 0);
1438 if (IS_ERR(vol->mftbmp_ino)) {
1439 ntfs_error(sb, "Failed to load $MFT/$BITMAP attribute.");
1440 goto iput_mirr_err_out;
1442 /* Read upcase table and setup @vol->upcase and @vol->upcase_len. */
1443 if (!load_and_init_upcase(vol))
1444 goto iput_mftbmp_err_out;
1447 * Read attribute definitions table and setup @vol->attrdef and
1448 * @vol->attrdef_size.
1450 if (!load_and_init_attrdef(vol))
1451 goto iput_upcase_err_out;
1452 #endif /* NTFS_RW */
1454 * Get the cluster allocation bitmap inode and verify the size, no
1455 * need for any locking at this stage as we are already running
1456 * exclusively as we are mount in progress task.
1458 vol->lcnbmp_ino = ntfs_iget(sb, FILE_Bitmap);
1459 if (IS_ERR(vol->lcnbmp_ino) || is_bad_inode(vol->lcnbmp_ino)) {
1460 if (!IS_ERR(vol->lcnbmp_ino))
1461 iput(vol->lcnbmp_ino);
1464 NInoSetSparseDisabled(NTFS_I(vol->lcnbmp_ino));
1465 if ((vol->nr_clusters + 7) >> 3 > i_size_read(vol->lcnbmp_ino)) {
1466 iput(vol->lcnbmp_ino);
1468 ntfs_error(sb, "Failed to load $Bitmap.");
1469 goto iput_attrdef_err_out;
1472 * Get the volume inode and setup our cache of the volume flags and
1475 vol->vol_ino = ntfs_iget(sb, FILE_Volume);
1476 if (IS_ERR(vol->vol_ino) || is_bad_inode(vol->vol_ino)) {
1477 if (!IS_ERR(vol->vol_ino))
1480 ntfs_error(sb, "Failed to load $Volume.");
1481 goto iput_lcnbmp_err_out;
1483 m = map_mft_record(NTFS_I(vol->vol_ino));
1489 if (!(ctx = ntfs_attr_get_search_ctx(NTFS_I(vol->vol_ino), m))) {
1490 ntfs_error(sb, "Failed to get attribute search context.");
1491 goto get_ctx_vol_failed;
1493 if (ntfs_attr_lookup(AT_VOLUME_INFORMATION, NULL, 0, 0, 0, NULL, 0,
1494 ctx) || ctx->attr->non_resident || ctx->attr->flags) {
1496 ntfs_attr_put_search_ctx(ctx);
1498 unmap_mft_record(NTFS_I(vol->vol_ino));
1499 goto iput_volume_failed;
1501 vi = (VOLUME_INFORMATION*)((char*)ctx->attr +
1502 le16_to_cpu(ctx->attr->data.resident.value_offset));
1503 /* Some bounds checks. */
1504 if ((u8*)vi < (u8*)ctx->attr || (u8*)vi +
1505 le32_to_cpu(ctx->attr->data.resident.value_length) >
1506 (u8*)ctx->attr + le32_to_cpu(ctx->attr->length))
1508 /* Copy the volume flags and version to the ntfs_volume structure. */
1509 vol->vol_flags = vi->flags;
1510 vol->major_ver = vi->major_ver;
1511 vol->minor_ver = vi->minor_ver;
1512 ntfs_attr_put_search_ctx(ctx);
1513 unmap_mft_record(NTFS_I(vol->vol_ino));
1514 printk(KERN_INFO "NTFS volume version %i.%i.\n", vol->major_ver,
1516 if (vol->major_ver < 3 && NVolSparseEnabled(vol)) {
1517 ntfs_warning(vol->sb, "Disabling sparse support due to NTFS "
1518 "volume version %i.%i (need at least version "
1519 "3.0).", vol->major_ver, vol->minor_ver);
1520 NVolClearSparseEnabled(vol);
1523 /* Make sure that no unsupported volume flags are set. */
1524 if (vol->vol_flags & VOLUME_MUST_MOUNT_RO_MASK) {
1525 static const char *es1a = "Volume is dirty";
1526 static const char *es1b = "Volume has unsupported flags set";
1527 static const char *es2 = ". Run chkdsk and mount in Windows.";
1530 es1 = vol->vol_flags & VOLUME_IS_DIRTY ? es1a : es1b;
1531 /* If a read-write mount, convert it to a read-only mount. */
1532 if (!(sb->s_flags & MS_RDONLY)) {
1533 if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO |
1534 ON_ERRORS_CONTINUE))) {
1535 ntfs_error(sb, "%s and neither on_errors="
1536 "continue nor on_errors="
1537 "remount-ro was specified%s",
1539 goto iput_vol_err_out;
1541 sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME;
1542 ntfs_error(sb, "%s. Mounting read-only%s", es1, es2);
1544 ntfs_warning(sb, "%s. Will not be able to remount "
1545 "read-write%s", es1, es2);
1547 * Do not set NVolErrors() because ntfs_remount() re-checks the
1548 * flags which we need to do in case any flags have changed.
1552 * Get the inode for the logfile, check it and determine if the volume
1553 * was shutdown cleanly.
1555 if (!load_and_check_logfile(vol) ||
1556 !ntfs_is_logfile_clean(vol->logfile_ino)) {
1557 static const char *es1a = "Failed to load $LogFile";
1558 static const char *es1b = "$LogFile is not clean";
1559 static const char *es2 = ". Mount in Windows.";
1562 es1 = !vol->logfile_ino ? es1a : es1b;
1563 /* If a read-write mount, convert it to a read-only mount. */
1564 if (!(sb->s_flags & MS_RDONLY)) {
1565 if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO |
1566 ON_ERRORS_CONTINUE))) {
1567 ntfs_error(sb, "%s and neither on_errors="
1568 "continue nor on_errors="
1569 "remount-ro was specified%s",
1571 goto iput_logfile_err_out;
1573 sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME;
1574 ntfs_error(sb, "%s. Mounting read-only%s", es1, es2);
1576 ntfs_warning(sb, "%s. Will not be able to remount "
1577 "read-write%s", es1, es2);
1578 /* This will prevent a read-write remount. */
1581 /* If (still) a read-write mount, mark the volume dirty. */
1582 if (!(sb->s_flags & MS_RDONLY) &&
1583 ntfs_set_volume_flags(vol, VOLUME_IS_DIRTY)) {
1584 static const char *es1 = "Failed to set dirty bit in volume "
1585 "information flags";
1586 static const char *es2 = ". Run chkdsk.";
1588 /* Convert to a read-only mount. */
1589 if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO |
1590 ON_ERRORS_CONTINUE))) {
1591 ntfs_error(sb, "%s and neither on_errors=continue nor "
1592 "on_errors=remount-ro was specified%s",
1594 goto iput_logfile_err_out;
1596 ntfs_error(sb, "%s. Mounting read-only%s", es1, es2);
1597 sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME;
1599 * Do not set NVolErrors() because ntfs_remount() might manage
1600 * to set the dirty flag in which case all would be well.
1604 // TODO: Enable this code once we start modifying anything that is
1605 // different between NTFS 1.2 and 3.x...
1607 * If (still) a read-write mount, set the NT4 compatibility flag on
1608 * newer NTFS version volumes.
1610 if (!(sb->s_flags & MS_RDONLY) && (vol->major_ver > 1) &&
1611 ntfs_set_volume_flags(vol, VOLUME_MOUNTED_ON_NT4)) {
1612 static const char *es1 = "Failed to set NT4 compatibility flag";
1613 static const char *es2 = ". Run chkdsk.";
1615 /* Convert to a read-only mount. */
1616 if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO |
1617 ON_ERRORS_CONTINUE))) {
1618 ntfs_error(sb, "%s and neither on_errors=continue nor "
1619 "on_errors=remount-ro was specified%s",
1621 goto iput_logfile_err_out;
1623 ntfs_error(sb, "%s. Mounting read-only%s", es1, es2);
1624 sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME;
1628 /* If (still) a read-write mount, empty the logfile. */
1629 if (!(sb->s_flags & MS_RDONLY) &&
1630 !ntfs_empty_logfile(vol->logfile_ino)) {
1631 static const char *es1 = "Failed to empty $LogFile";
1632 static const char *es2 = ". Mount in Windows.";
1634 /* Convert to a read-only mount. */
1635 if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO |
1636 ON_ERRORS_CONTINUE))) {
1637 ntfs_error(sb, "%s and neither on_errors=continue nor "
1638 "on_errors=remount-ro was specified%s",
1640 goto iput_logfile_err_out;
1642 ntfs_error(sb, "%s. Mounting read-only%s", es1, es2);
1643 sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME;
1646 #endif /* NTFS_RW */
1647 /* Get the root directory inode. */
1648 vol->root_ino = ntfs_iget(sb, FILE_root);
1649 if (IS_ERR(vol->root_ino) || is_bad_inode(vol->root_ino)) {
1650 if (!IS_ERR(vol->root_ino))
1651 iput(vol->root_ino);
1652 ntfs_error(sb, "Failed to load root directory.");
1653 goto iput_logfile_err_out;
1655 /* If on NTFS versions before 3.0, we are done. */
1656 if (vol->major_ver < 3)
1658 /* NTFS 3.0+ specific initialization. */
1659 /* Get the security descriptors inode. */
1660 vol->secure_ino = ntfs_iget(sb, FILE_Secure);
1661 if (IS_ERR(vol->secure_ino) || is_bad_inode(vol->secure_ino)) {
1662 if (!IS_ERR(vol->secure_ino))
1663 iput(vol->secure_ino);
1664 ntfs_error(sb, "Failed to load $Secure.");
1665 goto iput_root_err_out;
1667 // FIXME: Initialize security.
1668 /* Get the extended system files' directory inode. */
1669 vol->extend_ino = ntfs_iget(sb, FILE_Extend);
1670 if (IS_ERR(vol->extend_ino) || is_bad_inode(vol->extend_ino)) {
1671 if (!IS_ERR(vol->extend_ino))
1672 iput(vol->extend_ino);
1673 ntfs_error(sb, "Failed to load $Extend.");
1674 goto iput_sec_err_out;
1677 /* Find the quota file, load it if present, and set it up. */
1678 if (!load_and_init_quota(vol)) {
1679 static const char *es1 = "Failed to load $Quota";
1680 static const char *es2 = ". Run chkdsk.";
1682 /* If a read-write mount, convert it to a read-only mount. */
1683 if (!(sb->s_flags & MS_RDONLY)) {
1684 if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO |
1685 ON_ERRORS_CONTINUE))) {
1686 ntfs_error(sb, "%s and neither on_errors="
1687 "continue nor on_errors="
1688 "remount-ro was specified%s",
1690 goto iput_quota_err_out;
1692 sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME;
1693 ntfs_error(sb, "%s. Mounting read-only%s", es1, es2);
1695 ntfs_warning(sb, "%s. Will not be able to remount "
1696 "read-write%s", es1, es2);
1697 /* This will prevent a read-write remount. */
1700 /* If (still) a read-write mount, mark the quotas out of date. */
1701 if (!(sb->s_flags & MS_RDONLY) &&
1702 !ntfs_mark_quotas_out_of_date(vol)) {
1703 static const char *es1 = "Failed to mark quotas out of date";
1704 static const char *es2 = ". Run chkdsk.";
1706 /* Convert to a read-only mount. */
1707 if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO |
1708 ON_ERRORS_CONTINUE))) {
1709 ntfs_error(sb, "%s and neither on_errors=continue nor "
1710 "on_errors=remount-ro was specified%s",
1712 goto iput_quota_err_out;
1714 ntfs_error(sb, "%s. Mounting read-only%s", es1, es2);
1715 sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME;
1718 // TODO: Delete or checkpoint the $UsnJrnl if it exists.
1719 #endif /* NTFS_RW */
1723 if (vol->quota_q_ino)
1724 iput(vol->quota_q_ino);
1726 iput(vol->quota_ino);
1727 iput(vol->extend_ino);
1728 #endif /* NTFS_RW */
1730 iput(vol->secure_ino);
1732 iput(vol->root_ino);
1733 iput_logfile_err_out:
1735 if (vol->logfile_ino)
1736 iput(vol->logfile_ino);
1738 #endif /* NTFS_RW */
1740 iput_lcnbmp_err_out:
1741 iput(vol->lcnbmp_ino);
1742 iput_attrdef_err_out:
1743 vol->attrdef_size = 0;
1745 ntfs_free(vol->attrdef);
1746 vol->attrdef = NULL;
1749 iput_upcase_err_out:
1750 #endif /* NTFS_RW */
1751 vol->upcase_len = 0;
1753 if (vol->upcase == default_upcase) {
1754 ntfs_nr_upcase_users--;
1759 ntfs_free(vol->upcase);
1762 iput_mftbmp_err_out:
1763 iput(vol->mftbmp_ino);
1766 if (vol->mftmirr_ino)
1767 iput(vol->mftmirr_ino);
1768 #endif /* NTFS_RW */
1773 * ntfs_put_super - called by the vfs to unmount a volume
1774 * @sb: vfs superblock of volume to unmount
1776 * ntfs_put_super() is called by the VFS (from fs/super.c::do_umount()) when
1777 * the volume is being unmounted (umount system call has been invoked) and it
1778 * releases all inodes and memory belonging to the NTFS specific part of the
1781 static void ntfs_put_super(struct super_block *sb)
1783 ntfs_volume *vol = NTFS_SB(sb);
1785 ntfs_debug("Entering.");
1788 * Commit all inodes while they are still open in case some of them
1789 * cause others to be dirtied.
1791 ntfs_commit_inode(vol->vol_ino);
1793 /* NTFS 3.0+ specific. */
1794 if (vol->major_ver >= 3) {
1795 if (vol->quota_q_ino)
1796 ntfs_commit_inode(vol->quota_q_ino);
1798 ntfs_commit_inode(vol->quota_ino);
1799 if (vol->extend_ino)
1800 ntfs_commit_inode(vol->extend_ino);
1801 if (vol->secure_ino)
1802 ntfs_commit_inode(vol->secure_ino);
1805 ntfs_commit_inode(vol->root_ino);
1807 down_write(&vol->lcnbmp_lock);
1808 ntfs_commit_inode(vol->lcnbmp_ino);
1809 up_write(&vol->lcnbmp_lock);
1811 down_write(&vol->mftbmp_lock);
1812 ntfs_commit_inode(vol->mftbmp_ino);
1813 up_write(&vol->mftbmp_lock);
1815 if (vol->logfile_ino)
1816 ntfs_commit_inode(vol->logfile_ino);
1818 if (vol->mftmirr_ino)
1819 ntfs_commit_inode(vol->mftmirr_ino);
1820 ntfs_commit_inode(vol->mft_ino);
1823 * If a read-write mount and no volume errors have occured, mark the
1824 * volume clean. Also, re-commit all affected inodes.
1826 if (!(sb->s_flags & MS_RDONLY)) {
1827 if (!NVolErrors(vol)) {
1828 if (ntfs_clear_volume_flags(vol, VOLUME_IS_DIRTY))
1829 ntfs_warning(sb, "Failed to clear dirty bit "
1830 "in volume information "
1831 "flags. Run chkdsk.");
1832 ntfs_commit_inode(vol->vol_ino);
1833 ntfs_commit_inode(vol->root_ino);
1834 if (vol->mftmirr_ino)
1835 ntfs_commit_inode(vol->mftmirr_ino);
1836 ntfs_commit_inode(vol->mft_ino);
1838 ntfs_warning(sb, "Volume has errors. Leaving volume "
1839 "marked dirty. Run chkdsk.");
1842 #endif /* NTFS_RW */
1845 vol->vol_ino = NULL;
1847 /* NTFS 3.0+ specific clean up. */
1848 if (vol->major_ver >= 3) {
1850 if (vol->quota_q_ino) {
1851 iput(vol->quota_q_ino);
1852 vol->quota_q_ino = NULL;
1854 if (vol->quota_ino) {
1855 iput(vol->quota_ino);
1856 vol->quota_ino = NULL;
1858 #endif /* NTFS_RW */
1859 if (vol->extend_ino) {
1860 iput(vol->extend_ino);
1861 vol->extend_ino = NULL;
1863 if (vol->secure_ino) {
1864 iput(vol->secure_ino);
1865 vol->secure_ino = NULL;
1869 iput(vol->root_ino);
1870 vol->root_ino = NULL;
1872 down_write(&vol->lcnbmp_lock);
1873 iput(vol->lcnbmp_ino);
1874 vol->lcnbmp_ino = NULL;
1875 up_write(&vol->lcnbmp_lock);
1877 down_write(&vol->mftbmp_lock);
1878 iput(vol->mftbmp_ino);
1879 vol->mftbmp_ino = NULL;
1880 up_write(&vol->mftbmp_lock);
1883 if (vol->logfile_ino) {
1884 iput(vol->logfile_ino);
1885 vol->logfile_ino = NULL;
1887 if (vol->mftmirr_ino) {
1888 /* Re-commit the mft mirror and mft just in case. */
1889 ntfs_commit_inode(vol->mftmirr_ino);
1890 ntfs_commit_inode(vol->mft_ino);
1891 iput(vol->mftmirr_ino);
1892 vol->mftmirr_ino = NULL;
1895 * If any dirty inodes are left, throw away all mft data page cache
1896 * pages to allow a clean umount. This should never happen any more
1897 * due to mft.c::ntfs_mft_writepage() cleaning all the dirty pages as
1898 * the underlying mft records are written out and cleaned. If it does,
1899 * happen anyway, we want to know...
1901 ntfs_commit_inode(vol->mft_ino);
1902 write_inode_now(vol->mft_ino, 1);
1903 if (!list_empty(&sb->s_dirty)) {
1904 const char *s1, *s2;
1906 down(&vol->mft_ino->i_sem);
1907 truncate_inode_pages(vol->mft_ino->i_mapping, 0);
1908 up(&vol->mft_ino->i_sem);
1909 write_inode_now(vol->mft_ino, 1);
1910 if (!list_empty(&sb->s_dirty)) {
1911 static const char *_s1 = "inodes";
1912 static const char *_s2 = "";
1916 static const char *_s1 = "mft pages";
1917 static const char *_s2 = "They have been thrown "
1922 ntfs_error(sb, "Dirty %s found at umount time. %sYou should "
1923 "run chkdsk. Please email "
1924 "linux-ntfs-dev@lists.sourceforge.net and say "
1925 "that you saw this message. Thank you.", s1,
1928 #endif /* NTFS_RW */
1931 vol->mft_ino = NULL;
1933 /* Throw away the table of attribute definitions. */
1934 vol->attrdef_size = 0;
1936 ntfs_free(vol->attrdef);
1937 vol->attrdef = NULL;
1939 vol->upcase_len = 0;
1941 * Destroy the global default upcase table if necessary. Also decrease
1942 * the number of upcase users if we are a user.
1945 if (vol->upcase == default_upcase) {
1946 ntfs_nr_upcase_users--;
1949 if (!ntfs_nr_upcase_users && default_upcase) {
1950 ntfs_free(default_upcase);
1951 default_upcase = NULL;
1953 if (vol->cluster_size <= 4096 && !--ntfs_nr_compression_users)
1954 free_compression_buffers();
1957 ntfs_free(vol->upcase);
1961 unload_nls(vol->nls_map);
1962 vol->nls_map = NULL;
1964 sb->s_fs_info = NULL;
1970 * get_nr_free_clusters - return the number of free clusters on a volume
1971 * @vol: ntfs volume for which to obtain free cluster count
1973 * Calculate the number of free clusters on the mounted NTFS volume @vol. We
1974 * actually calculate the number of clusters in use instead because this
1975 * allows us to not care about partial pages as these will be just zero filled
1976 * and hence not be counted as allocated clusters.
1978 * The only particularity is that clusters beyond the end of the logical ntfs
1979 * volume will be marked as allocated to prevent errors which means we have to
1980 * discount those at the end. This is important as the cluster bitmap always
1981 * has a size in multiples of 8 bytes, i.e. up to 63 clusters could be outside
1982 * the logical volume and marked in use when they are not as they do not exist.
1984 * If any pages cannot be read we assume all clusters in the erroring pages are
1985 * in use. This means we return an underestimate on errors which is better than
1988 static s64 get_nr_free_clusters(ntfs_volume *vol)
1990 s64 nr_free = vol->nr_clusters;
1992 struct address_space *mapping = vol->lcnbmp_ino->i_mapping;
1993 filler_t *readpage = (filler_t*)mapping->a_ops->readpage;
1995 pgoff_t index, max_index;
1997 ntfs_debug("Entering.");
1998 /* Serialize accesses to the cluster bitmap. */
1999 down_read(&vol->lcnbmp_lock);
2001 * Convert the number of bits into bytes rounded up, then convert into
2002 * multiples of PAGE_CACHE_SIZE, rounding up so that if we have one
2003 * full and one partial page max_index = 2.
2005 max_index = (((vol->nr_clusters + 7) >> 3) + PAGE_CACHE_SIZE - 1) >>
2007 /* Use multiples of 4 bytes, thus max_size is PAGE_CACHE_SIZE / 4. */
2008 ntfs_debug("Reading $Bitmap, max_index = 0x%lx, max_size = 0x%lx.",
2009 max_index, PAGE_CACHE_SIZE / 4);
2010 for (index = 0; index < max_index; index++) {
2013 * Read the page from page cache, getting it from backing store
2014 * if necessary, and increment the use count.
2016 page = read_cache_page(mapping, index, (filler_t*)readpage,
2018 /* Ignore pages which errored synchronously. */
2020 ntfs_debug("Sync read_cache_page() error. Skipping "
2021 "page (index 0x%lx).", index);
2022 nr_free -= PAGE_CACHE_SIZE * 8;
2025 wait_on_page_locked(page);
2026 /* Ignore pages which errored asynchronously. */
2027 if (!PageUptodate(page)) {
2028 ntfs_debug("Async read_cache_page() error. Skipping "
2029 "page (index 0x%lx).", index);
2030 page_cache_release(page);
2031 nr_free -= PAGE_CACHE_SIZE * 8;
2034 kaddr = (u32*)kmap_atomic(page, KM_USER0);
2036 * For each 4 bytes, subtract the number of set bits. If this
2037 * is the last page and it is partial we don't really care as
2038 * it just means we do a little extra work but it won't affect
2039 * the result as all out of range bytes are set to zero by
2042 for (i = 0; i < PAGE_CACHE_SIZE / 4; i++)
2043 nr_free -= (s64)hweight32(kaddr[i]);
2044 kunmap_atomic(kaddr, KM_USER0);
2045 page_cache_release(page);
2047 ntfs_debug("Finished reading $Bitmap, last index = 0x%lx.", index - 1);
2049 * Fixup for eventual bits outside logical ntfs volume (see function
2050 * description above).
2052 if (vol->nr_clusters & 63)
2053 nr_free += 64 - (vol->nr_clusters & 63);
2054 up_read(&vol->lcnbmp_lock);
2055 /* If errors occured we may well have gone below zero, fix this. */
2058 ntfs_debug("Exiting.");
2063 * __get_nr_free_mft_records - return the number of free inodes on a volume
2064 * @vol: ntfs volume for which to obtain free inode count
2065 * @nr_free: number of mft records in filesystem
2066 * @max_index: maximum number of pages containing set bits
2068 * Calculate the number of free mft records (inodes) on the mounted NTFS
2069 * volume @vol. We actually calculate the number of mft records in use instead
2070 * because this allows us to not care about partial pages as these will be just
2071 * zero filled and hence not be counted as allocated mft record.
2073 * If any pages cannot be read we assume all mft records in the erroring pages
2074 * are in use. This means we return an underestimate on errors which is better
2075 * than an overestimate.
2077 * NOTE: Caller must hold mftbmp_lock rw_semaphore for reading or writing.
2079 static unsigned long __get_nr_free_mft_records(ntfs_volume *vol,
2080 s64 nr_free, const pgoff_t max_index)
2083 struct address_space *mapping = vol->mftbmp_ino->i_mapping;
2084 filler_t *readpage = (filler_t*)mapping->a_ops->readpage;
2088 ntfs_debug("Entering.");
2089 /* Use multiples of 4 bytes, thus max_size is PAGE_CACHE_SIZE / 4. */
2090 ntfs_debug("Reading $MFT/$BITMAP, max_index = 0x%lx, max_size = "
2091 "0x%lx.", max_index, PAGE_CACHE_SIZE / 4);
2092 for (index = 0; index < max_index; index++) {
2095 * Read the page from page cache, getting it from backing store
2096 * if necessary, and increment the use count.
2098 page = read_cache_page(mapping, index, (filler_t*)readpage,
2100 /* Ignore pages which errored synchronously. */
2102 ntfs_debug("Sync read_cache_page() error. Skipping "
2103 "page (index 0x%lx).", index);
2104 nr_free -= PAGE_CACHE_SIZE * 8;
2107 wait_on_page_locked(page);
2108 /* Ignore pages which errored asynchronously. */
2109 if (!PageUptodate(page)) {
2110 ntfs_debug("Async read_cache_page() error. Skipping "
2111 "page (index 0x%lx).", index);
2112 page_cache_release(page);
2113 nr_free -= PAGE_CACHE_SIZE * 8;
2116 kaddr = (u32*)kmap_atomic(page, KM_USER0);
2118 * For each 4 bytes, subtract the number of set bits. If this
2119 * is the last page and it is partial we don't really care as
2120 * it just means we do a little extra work but it won't affect
2121 * the result as all out of range bytes are set to zero by
2124 for (i = 0; i < PAGE_CACHE_SIZE / 4; i++)
2125 nr_free -= (s64)hweight32(kaddr[i]);
2126 kunmap_atomic(kaddr, KM_USER0);
2127 page_cache_release(page);
2129 ntfs_debug("Finished reading $MFT/$BITMAP, last index = 0x%lx.",
2131 /* If errors occured we may well have gone below zero, fix this. */
2134 ntfs_debug("Exiting.");
2139 * ntfs_statfs - return information about mounted NTFS volume
2140 * @sb: super block of mounted volume
2141 * @sfs: statfs structure in which to return the information
2143 * Return information about the mounted NTFS volume @sb in the statfs structure
2144 * pointed to by @sfs (this is initialized with zeros before ntfs_statfs is
2145 * called). We interpret the values to be correct of the moment in time at
2146 * which we are called. Most values are variable otherwise and this isn't just
2147 * the free values but the totals as well. For example we can increase the
2148 * total number of file nodes if we run out and we can keep doing this until
2149 * there is no more space on the volume left at all.
2151 * Called from vfs_statfs which is used to handle the statfs, fstatfs, and
2152 * ustat system calls.
2154 * Return 0 on success or -errno on error.
2156 static int ntfs_statfs(struct super_block *sb, struct kstatfs *sfs)
2159 ntfs_volume *vol = NTFS_SB(sb);
2160 ntfs_inode *mft_ni = NTFS_I(vol->mft_ino);
2162 unsigned long flags;
2164 ntfs_debug("Entering.");
2165 /* Type of filesystem. */
2166 sfs->f_type = NTFS_SB_MAGIC;
2167 /* Optimal transfer block size. */
2168 sfs->f_bsize = PAGE_CACHE_SIZE;
2170 * Total data blocks in filesystem in units of f_bsize and since
2171 * inodes are also stored in data blocs ($MFT is a file) this is just
2172 * the total clusters.
2174 sfs->f_blocks = vol->nr_clusters << vol->cluster_size_bits >>
2176 /* Free data blocks in filesystem in units of f_bsize. */
2177 size = get_nr_free_clusters(vol) << vol->cluster_size_bits >>
2181 /* Free blocks avail to non-superuser, same as above on NTFS. */
2182 sfs->f_bavail = sfs->f_bfree = size;
2183 /* Serialize accesses to the inode bitmap. */
2184 down_read(&vol->mftbmp_lock);
2185 read_lock_irqsave(&mft_ni->size_lock, flags);
2186 size = i_size_read(vol->mft_ino) >> vol->mft_record_size_bits;
2188 * Convert the maximum number of set bits into bytes rounded up, then
2189 * convert into multiples of PAGE_CACHE_SIZE, rounding up so that if we
2190 * have one full and one partial page max_index = 2.
2192 max_index = ((((mft_ni->initialized_size >> vol->mft_record_size_bits)
2193 + 7) >> 3) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
2194 read_unlock_irqrestore(&mft_ni->size_lock, flags);
2195 /* Number of inodes in filesystem (at this point in time). */
2196 sfs->f_files = size;
2197 /* Free inodes in fs (based on current total count). */
2198 sfs->f_ffree = __get_nr_free_mft_records(vol, size, max_index);
2199 up_read(&vol->mftbmp_lock);
2201 * File system id. This is extremely *nix flavour dependent and even
2202 * within Linux itself all fs do their own thing. I interpret this to
2203 * mean a unique id associated with the mounted fs and not the id
2204 * associated with the filesystem driver, the latter is already given
2205 * by the filesystem type in sfs->f_type. Thus we use the 64-bit
2206 * volume serial number splitting it into two 32-bit parts. We enter
2207 * the least significant 32-bits in f_fsid[0] and the most significant
2208 * 32-bits in f_fsid[1].
2210 sfs->f_fsid.val[0] = vol->serial_no & 0xffffffff;
2211 sfs->f_fsid.val[1] = (vol->serial_no >> 32) & 0xffffffff;
2212 /* Maximum length of filenames. */
2213 sfs->f_namelen = NTFS_MAX_NAME_LEN;
2218 * The complete super operations.
2220 static struct super_operations ntfs_sops = {
2221 .alloc_inode = ntfs_alloc_big_inode, /* VFS: Allocate new inode. */
2222 .destroy_inode = ntfs_destroy_big_inode, /* VFS: Deallocate inode. */
2223 .put_inode = ntfs_put_inode, /* VFS: Called just before
2224 the inode reference count
2227 //.dirty_inode = NULL, /* VFS: Called from
2228 // __mark_inode_dirty(). */
2229 .write_inode = ntfs_write_inode, /* VFS: Write dirty inode to
2231 //.drop_inode = NULL, /* VFS: Called just after the
2232 // inode reference count has
2233 // been decreased to zero.
2234 // NOTE: The inode lock is
2235 // held. See fs/inode.c::
2236 // generic_drop_inode(). */
2237 //.delete_inode = NULL, /* VFS: Delete inode from disk.
2238 // Called when i_count becomes
2239 // 0 and i_nlink is also 0. */
2240 //.write_super = NULL, /* Flush dirty super block to
2242 //.sync_fs = NULL, /* ? */
2243 //.write_super_lockfs = NULL, /* ? */
2244 //.unlockfs = NULL, /* ? */
2245 #endif /* NTFS_RW */
2246 .put_super = ntfs_put_super, /* Syscall: umount. */
2247 .statfs = ntfs_statfs, /* Syscall: statfs */
2248 .remount_fs = ntfs_remount, /* Syscall: mount -o remount. */
2249 .clear_inode = ntfs_clear_big_inode, /* VFS: Called when an inode is
2250 removed from memory. */
2251 //.umount_begin = NULL, /* Forced umount. */
2252 .show_options = ntfs_show_options, /* Show mount options in
2257 * ntfs_fill_super - mount an ntfs filesystem
2258 * @sb: super block of ntfs filesystem to mount
2259 * @opt: string containing the mount options
2260 * @silent: silence error output
2262 * ntfs_fill_super() is called by the VFS to mount the device described by @sb
2263 * with the mount otions in @data with the NTFS filesystem.
2265 * If @silent is true, remain silent even if errors are detected. This is used
2266 * during bootup, when the kernel tries to mount the root filesystem with all
2267 * registered filesystems one after the other until one succeeds. This implies
2268 * that all filesystems except the correct one will quite correctly and
2269 * expectedly return an error, but nobody wants to see error messages when in
2270 * fact this is what is supposed to happen.
2272 * NOTE: @sb->s_flags contains the mount options flags.
2274 static int ntfs_fill_super(struct super_block *sb, void *opt, const int silent)
2277 struct buffer_head *bh;
2278 struct inode *tmp_ino;
2281 ntfs_debug("Entering.");
2283 sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME;
2284 #endif /* ! NTFS_RW */
2285 /* Allocate a new ntfs_volume and place it in sb->s_fs_info. */
2286 sb->s_fs_info = kmalloc(sizeof(ntfs_volume), GFP_NOFS);
2290 ntfs_error(sb, "Allocation of NTFS volume structure "
2291 "failed. Aborting mount...");
2294 /* Initialize ntfs_volume structure. */
2295 *vol = (ntfs_volume) {
2298 * Default is group and other don't have any access to files or
2299 * directories while owner has full access. Further, files by
2300 * default are not executable but directories are of course
2306 init_rwsem(&vol->mftbmp_lock);
2307 init_rwsem(&vol->lcnbmp_lock);
2311 /* By default, enable sparse support. */
2312 NVolSetSparseEnabled(vol);
2314 /* Important to get the mount options dealt with now. */
2315 if (!parse_options(vol, (char*)opt))
2319 * TODO: Fail safety check. In the future we should really be able to
2320 * cope with this being the case, but for now just bail out.
2322 if (bdev_hardsect_size(sb->s_bdev) > NTFS_BLOCK_SIZE) {
2324 ntfs_error(sb, "Device has unsupported hardsect_size.");
2328 /* Setup the device access block size to NTFS_BLOCK_SIZE. */
2329 if (sb_set_blocksize(sb, NTFS_BLOCK_SIZE) != NTFS_BLOCK_SIZE) {
2331 ntfs_error(sb, "Unable to set block size.");
2335 /* Get the size of the device in units of NTFS_BLOCK_SIZE bytes. */
2336 vol->nr_blocks = i_size_read(sb->s_bdev->bd_inode) >>
2337 NTFS_BLOCK_SIZE_BITS;
2339 /* Read the boot sector and return unlocked buffer head to it. */
2340 if (!(bh = read_ntfs_boot_sector(sb, silent))) {
2342 ntfs_error(sb, "Not an NTFS volume.");
2347 * Extract the data from the boot sector and setup the ntfs super block
2350 result = parse_ntfs_boot_sector(vol, (NTFS_BOOT_SECTOR*)bh->b_data);
2352 /* Initialize the cluster and mft allocators. */
2353 ntfs_setup_allocators(vol);
2359 ntfs_error(sb, "Unsupported NTFS filesystem.");
2364 * TODO: When we start coping with sector sizes different from
2365 * NTFS_BLOCK_SIZE, we now probably need to set the blocksize of the
2366 * device (probably to NTFS_BLOCK_SIZE).
2369 /* Setup remaining fields in the super block. */
2370 sb->s_magic = NTFS_SB_MAGIC;
2373 * Ntfs allows 63 bits for the file size, i.e. correct would be:
2374 * sb->s_maxbytes = ~0ULL >> 1;
2375 * But the kernel uses a long as the page cache page index which on
2376 * 32-bit architectures is only 32-bits. MAX_LFS_FILESIZE is kernel
2377 * defined to the maximum the page cache page index can cope with
2378 * without overflowing the index or to 2^63 - 1, whichever is smaller.
2380 sb->s_maxbytes = MAX_LFS_FILESIZE;
2382 sb->s_time_gran = 100;
2385 * Now load the metadata required for the page cache and our address
2386 * space operations to function. We do this by setting up a specialised
2387 * read_inode method and then just calling the normal iget() to obtain
2388 * the inode for $MFT which is sufficient to allow our normal inode
2389 * operations and associated address space operations to function.
2391 sb->s_op = &ntfs_sops;
2392 tmp_ino = new_inode(sb);
2395 ntfs_error(sb, "Failed to load essential metadata.");
2398 tmp_ino->i_ino = FILE_MFT;
2399 insert_inode_hash(tmp_ino);
2400 if (ntfs_read_inode_mount(tmp_ino) < 0) {
2402 ntfs_error(sb, "Failed to load essential metadata.");
2403 goto iput_tmp_ino_err_out_now;
2407 * The current mount is a compression user if the cluster size is
2408 * less than or equal 4kiB.
2410 if (vol->cluster_size <= 4096 && !ntfs_nr_compression_users++) {
2411 result = allocate_compression_buffers();
2413 ntfs_error(NULL, "Failed to allocate buffers "
2414 "for compression engine.");
2415 ntfs_nr_compression_users--;
2417 goto iput_tmp_ino_err_out_now;
2421 * Generate the global default upcase table if necessary. Also
2422 * temporarily increment the number of upcase users to avoid race
2423 * conditions with concurrent (u)mounts.
2425 if (!default_upcase)
2426 default_upcase = generate_default_upcase();
2427 ntfs_nr_upcase_users++;
2430 * From now on, ignore @silent parameter. If we fail below this line,
2431 * it will be due to a corrupt fs or a system error, so we report it.
2434 * Open the system files with normal access functions and complete
2435 * setting up the ntfs super block.
2437 if (!load_system_files(vol)) {
2438 ntfs_error(sb, "Failed to load system files.");
2439 goto unl_upcase_iput_tmp_ino_err_out_now;
2441 if ((sb->s_root = d_alloc_root(vol->root_ino))) {
2442 /* We increment i_count simulating an ntfs_iget(). */
2443 atomic_inc(&vol->root_ino->i_count);
2444 ntfs_debug("Exiting, status successful.");
2445 /* Release the default upcase if it has no users. */
2447 if (!--ntfs_nr_upcase_users && default_upcase) {
2448 ntfs_free(default_upcase);
2449 default_upcase = NULL;
2452 sb->s_export_op = &ntfs_export_ops;
2456 ntfs_error(sb, "Failed to allocate root directory.");
2457 /* Clean up after the successful load_system_files() call from above. */
2458 // TODO: Use ntfs_put_super() instead of repeating all this code...
2459 // FIXME: Should mark the volume clean as the error is most likely
2462 vol->vol_ino = NULL;
2463 /* NTFS 3.0+ specific clean up. */
2464 if (vol->major_ver >= 3) {
2466 if (vol->quota_q_ino) {
2467 iput(vol->quota_q_ino);
2468 vol->quota_q_ino = NULL;
2470 if (vol->quota_ino) {
2471 iput(vol->quota_ino);
2472 vol->quota_ino = NULL;
2474 #endif /* NTFS_RW */
2475 if (vol->extend_ino) {
2476 iput(vol->extend_ino);
2477 vol->extend_ino = NULL;
2479 if (vol->secure_ino) {
2480 iput(vol->secure_ino);
2481 vol->secure_ino = NULL;
2484 iput(vol->root_ino);
2485 vol->root_ino = NULL;
2486 iput(vol->lcnbmp_ino);
2487 vol->lcnbmp_ino = NULL;
2488 iput(vol->mftbmp_ino);
2489 vol->mftbmp_ino = NULL;
2491 if (vol->logfile_ino) {
2492 iput(vol->logfile_ino);
2493 vol->logfile_ino = NULL;
2495 if (vol->mftmirr_ino) {
2496 iput(vol->mftmirr_ino);
2497 vol->mftmirr_ino = NULL;
2499 #endif /* NTFS_RW */
2500 /* Throw away the table of attribute definitions. */
2501 vol->attrdef_size = 0;
2503 ntfs_free(vol->attrdef);
2504 vol->attrdef = NULL;
2506 vol->upcase_len = 0;
2508 if (vol->upcase == default_upcase) {
2509 ntfs_nr_upcase_users--;
2514 ntfs_free(vol->upcase);
2518 unload_nls(vol->nls_map);
2519 vol->nls_map = NULL;
2521 /* Error exit code path. */
2522 unl_upcase_iput_tmp_ino_err_out_now:
2524 * Decrease the number of upcase users and destroy the global default
2525 * upcase table if necessary.
2528 if (!--ntfs_nr_upcase_users && default_upcase) {
2529 ntfs_free(default_upcase);
2530 default_upcase = NULL;
2532 if (vol->cluster_size <= 4096 && !--ntfs_nr_compression_users)
2533 free_compression_buffers();
2535 iput_tmp_ino_err_out_now:
2537 if (vol->mft_ino && vol->mft_ino != tmp_ino)
2539 vol->mft_ino = NULL;
2541 * This is needed to get ntfs_clear_extent_inode() called for each
2542 * inode we have ever called ntfs_iget()/iput() on, otherwise we A)
2543 * leak resources and B) a subsequent mount fails automatically due to
2544 * ntfs_iget() never calling down into our ntfs_read_locked_inode()
2545 * method again... FIXME: Do we need to do this twice now because of
2546 * attribute inodes? I think not, so leave as is for now... (AIA)
2548 if (invalidate_inodes(sb)) {
2549 ntfs_error(sb, "Busy inodes left. This is most likely a NTFS "
2551 /* Copied from fs/super.c. I just love this message. (-; */
2552 printk("NTFS: Busy inodes after umount. Self-destruct in 5 "
2553 "seconds. Have a nice day...\n");
2555 /* Errors at this stage are irrelevant. */
2558 sb->s_fs_info = NULL;
2560 ntfs_debug("Failed, returning -EINVAL.");
2565 * This is a slab cache to optimize allocations and deallocations of Unicode
2566 * strings of the maximum length allowed by NTFS, which is NTFS_MAX_NAME_LEN
2567 * (255) Unicode characters + a terminating NULL Unicode character.
2569 kmem_cache_t *ntfs_name_cache;
2571 /* Slab caches for efficient allocation/deallocation of inodes. */
2572 kmem_cache_t *ntfs_inode_cache;
2573 kmem_cache_t *ntfs_big_inode_cache;
2575 /* Init once constructor for the inode slab cache. */
2576 static void ntfs_big_inode_init_once(void *foo, kmem_cache_t *cachep,
2577 unsigned long flags)
2579 ntfs_inode *ni = (ntfs_inode *)foo;
2581 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
2582 SLAB_CTOR_CONSTRUCTOR)
2583 inode_init_once(VFS_I(ni));
2587 * Slab caches to optimize allocations and deallocations of attribute search
2588 * contexts and index contexts, respectively.
2590 kmem_cache_t *ntfs_attr_ctx_cache;
2591 kmem_cache_t *ntfs_index_ctx_cache;
2593 /* Driver wide semaphore. */
2594 DECLARE_MUTEX(ntfs_lock);
2596 static struct super_block *ntfs_get_sb(struct file_system_type *fs_type,
2597 int flags, const char *dev_name, void *data)
2599 return get_sb_bdev(fs_type, flags, dev_name, data, ntfs_fill_super);
2602 static struct file_system_type ntfs_fs_type = {
2603 .owner = THIS_MODULE,
2605 .get_sb = ntfs_get_sb,
2606 .kill_sb = kill_block_super,
2607 .fs_flags = FS_REQUIRES_DEV,
2610 /* Stable names for the slab caches. */
2611 static const char ntfs_index_ctx_cache_name[] = "ntfs_index_ctx_cache";
2612 static const char ntfs_attr_ctx_cache_name[] = "ntfs_attr_ctx_cache";
2613 static const char ntfs_name_cache_name[] = "ntfs_name_cache";
2614 static const char ntfs_inode_cache_name[] = "ntfs_inode_cache";
2615 static const char ntfs_big_inode_cache_name[] = "ntfs_big_inode_cache";
2617 static int __init init_ntfs_fs(void)
2621 /* This may be ugly but it results in pretty output so who cares. (-8 */
2622 printk(KERN_INFO "NTFS driver " NTFS_VERSION " [Flags: R/"
2636 ntfs_debug("Debug messages are enabled.");
2638 ntfs_index_ctx_cache = kmem_cache_create(ntfs_index_ctx_cache_name,
2639 sizeof(ntfs_index_context), 0 /* offset */,
2640 SLAB_HWCACHE_ALIGN, NULL /* ctor */, NULL /* dtor */);
2641 if (!ntfs_index_ctx_cache) {
2642 printk(KERN_CRIT "NTFS: Failed to create %s!\n",
2643 ntfs_index_ctx_cache_name);
2646 ntfs_attr_ctx_cache = kmem_cache_create(ntfs_attr_ctx_cache_name,
2647 sizeof(ntfs_attr_search_ctx), 0 /* offset */,
2648 SLAB_HWCACHE_ALIGN, NULL /* ctor */, NULL /* dtor */);
2649 if (!ntfs_attr_ctx_cache) {
2650 printk(KERN_CRIT "NTFS: Failed to create %s!\n",
2651 ntfs_attr_ctx_cache_name);
2655 ntfs_name_cache = kmem_cache_create(ntfs_name_cache_name,
2656 (NTFS_MAX_NAME_LEN+1) * sizeof(ntfschar), 0,
2657 SLAB_HWCACHE_ALIGN, NULL, NULL);
2658 if (!ntfs_name_cache) {
2659 printk(KERN_CRIT "NTFS: Failed to create %s!\n",
2660 ntfs_name_cache_name);
2664 ntfs_inode_cache = kmem_cache_create(ntfs_inode_cache_name,
2665 sizeof(ntfs_inode), 0,
2666 SLAB_RECLAIM_ACCOUNT, NULL, NULL);
2667 if (!ntfs_inode_cache) {
2668 printk(KERN_CRIT "NTFS: Failed to create %s!\n",
2669 ntfs_inode_cache_name);
2673 ntfs_big_inode_cache = kmem_cache_create(ntfs_big_inode_cache_name,
2674 sizeof(big_ntfs_inode), 0,
2675 SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT,
2676 ntfs_big_inode_init_once, NULL);
2677 if (!ntfs_big_inode_cache) {
2678 printk(KERN_CRIT "NTFS: Failed to create %s!\n",
2679 ntfs_big_inode_cache_name);
2680 goto big_inode_err_out;
2683 /* Register the ntfs sysctls. */
2684 err = ntfs_sysctl(1);
2686 printk(KERN_CRIT "NTFS: Failed to register NTFS sysctls!\n");
2687 goto sysctl_err_out;
2690 err = register_filesystem(&ntfs_fs_type);
2692 ntfs_debug("NTFS driver registered successfully.");
2693 return 0; /* Success! */
2695 printk(KERN_CRIT "NTFS: Failed to register NTFS filesystem driver!\n");
2698 kmem_cache_destroy(ntfs_big_inode_cache);
2700 kmem_cache_destroy(ntfs_inode_cache);
2702 kmem_cache_destroy(ntfs_name_cache);
2704 kmem_cache_destroy(ntfs_attr_ctx_cache);
2706 kmem_cache_destroy(ntfs_index_ctx_cache);
2709 printk(KERN_CRIT "NTFS: Aborting NTFS filesystem driver "
2710 "registration...\n");
2716 static void __exit exit_ntfs_fs(void)
2720 ntfs_debug("Unregistering NTFS driver.");
2722 unregister_filesystem(&ntfs_fs_type);
2724 if (kmem_cache_destroy(ntfs_big_inode_cache) && (err = 1))
2725 printk(KERN_CRIT "NTFS: Failed to destory %s.\n",
2726 ntfs_big_inode_cache_name);
2727 if (kmem_cache_destroy(ntfs_inode_cache) && (err = 1))
2728 printk(KERN_CRIT "NTFS: Failed to destory %s.\n",
2729 ntfs_inode_cache_name);
2730 if (kmem_cache_destroy(ntfs_name_cache) && (err = 1))
2731 printk(KERN_CRIT "NTFS: Failed to destory %s.\n",
2732 ntfs_name_cache_name);
2733 if (kmem_cache_destroy(ntfs_attr_ctx_cache) && (err = 1))
2734 printk(KERN_CRIT "NTFS: Failed to destory %s.\n",
2735 ntfs_attr_ctx_cache_name);
2736 if (kmem_cache_destroy(ntfs_index_ctx_cache) && (err = 1))
2737 printk(KERN_CRIT "NTFS: Failed to destory %s.\n",
2738 ntfs_index_ctx_cache_name);
2740 printk(KERN_CRIT "NTFS: This causes memory to leak! There is "
2741 "probably a BUG in the driver! Please report "
2742 "you saw this message to "
2743 "linux-ntfs-dev@lists.sourceforge.net\n");
2744 /* Unregister the ntfs sysctls. */
2748 MODULE_AUTHOR("Anton Altaparmakov <aia21@cantab.net>");
2749 MODULE_DESCRIPTION("NTFS 1.2/3.x driver - Copyright (c) 2001-2005 Anton Altaparmakov");
2750 MODULE_VERSION(NTFS_VERSION);
2751 MODULE_LICENSE("GPL");
2753 module_param(debug_msgs, bool, 0);
2754 MODULE_PARM_DESC(debug_msgs, "Enable debug messages.");
2757 module_init(init_ntfs_fs)
2758 module_exit(exit_ntfs_fs)