diff options
Diffstat (limited to 'fs/ntfs/super.c')
| -rw-r--r-- | fs/ntfs/super.c | 2771 |
1 files changed, 2771 insertions, 0 deletions
diff --git a/fs/ntfs/super.c b/fs/ntfs/super.c new file mode 100644 index 0000000..212a3d0 --- /dev/null +++ b/fs/ntfs/super.c @@ -0,0 +1,2771 @@ +/* + * super.c - NTFS kernel super block handling. Part of the Linux-NTFS project. + * + * Copyright (c) 2001-2004 Anton Altaparmakov + * Copyright (c) 2001,2002 Richard Russon + * + * This program/include file is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as published + * by the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program/include file is distributed in the hope that it will be + * useful, but WITHOUT ANY WARRANTY; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program (in the main directory of the Linux-NTFS + * distribution in the file COPYING); if not, write to the Free Software + * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/stddef.h> +#include <linux/init.h> +#include <linux/string.h> +#include <linux/spinlock.h> +#include <linux/blkdev.h> /* For bdev_hardsect_size(). */ +#include <linux/backing-dev.h> +#include <linux/buffer_head.h> +#include <linux/vfs.h> +#include <linux/moduleparam.h> +#include <linux/smp_lock.h> + +#include "sysctl.h" +#include "logfile.h" +#include "quota.h" +#include "dir.h" +#include "debug.h" +#include "index.h" +#include "aops.h" +#include "malloc.h" +#include "ntfs.h" + +/* Number of mounted file systems which have compression enabled. */ +static unsigned long ntfs_nr_compression_users; + +/* A global default upcase table and a corresponding reference count. */ +static ntfschar *default_upcase = NULL; +static unsigned long ntfs_nr_upcase_users = 0; + +/* Error constants/strings used in inode.c::ntfs_show_options(). */ +typedef enum { + /* One of these must be present, default is ON_ERRORS_CONTINUE. */ + ON_ERRORS_PANIC = 0x01, + ON_ERRORS_REMOUNT_RO = 0x02, + ON_ERRORS_CONTINUE = 0x04, + /* Optional, can be combined with any of the above. */ + ON_ERRORS_RECOVER = 0x10, +} ON_ERRORS_ACTIONS; + +const option_t on_errors_arr[] = { + { ON_ERRORS_PANIC, "panic" }, + { ON_ERRORS_REMOUNT_RO, "remount-ro", }, + { ON_ERRORS_CONTINUE, "continue", }, + { ON_ERRORS_RECOVER, "recover" }, + { 0, NULL } +}; + +/** + * simple_getbool - + * + * Copied from old ntfs driver (which copied from vfat driver). + */ +static int simple_getbool(char *s, BOOL *setval) +{ + if (s) { + if (!strcmp(s, "1") || !strcmp(s, "yes") || !strcmp(s, "true")) + *setval = TRUE; + else if (!strcmp(s, "0") || !strcmp(s, "no") || + !strcmp(s, "false")) + *setval = FALSE; + else + return 0; + } else + *setval = TRUE; + return 1; +} + +/** + * parse_options - parse the (re)mount options + * @vol: ntfs volume + * @opt: string containing the (re)mount options + * + * Parse the recognized options in @opt for the ntfs volume described by @vol. + */ +static BOOL parse_options(ntfs_volume *vol, char *opt) +{ + char *p, *v, *ov; + static char *utf8 = "utf8"; + int errors = 0, sloppy = 0; + uid_t uid = (uid_t)-1; + gid_t gid = (gid_t)-1; + mode_t fmask = (mode_t)-1, dmask = (mode_t)-1; + int mft_zone_multiplier = -1, on_errors = -1; + int show_sys_files = -1, case_sensitive = -1; + struct nls_table *nls_map = NULL, *old_nls; + + /* I am lazy... (-8 */ +#define NTFS_GETOPT_WITH_DEFAULT(option, variable, default_value) \ + if (!strcmp(p, option)) { \ + if (!v || !*v) \ + variable = default_value; \ + else { \ + variable = simple_strtoul(ov = v, &v, 0); \ + if (*v) \ + goto needs_val; \ + } \ + } +#define NTFS_GETOPT(option, variable) \ + if (!strcmp(p, option)) { \ + if (!v || !*v) \ + goto needs_arg; \ + variable = simple_strtoul(ov = v, &v, 0); \ + if (*v) \ + goto needs_val; \ + } +#define NTFS_GETOPT_BOOL(option, variable) \ + if (!strcmp(p, option)) { \ + BOOL val; \ + if (!simple_getbool(v, &val)) \ + goto needs_bool; \ + variable = val; \ + } +#define NTFS_GETOPT_OPTIONS_ARRAY(option, variable, opt_array) \ + if (!strcmp(p, option)) { \ + int _i; \ + if (!v || !*v) \ + goto needs_arg; \ + ov = v; \ + if (variable == -1) \ + variable = 0; \ + for (_i = 0; opt_array[_i].str && *opt_array[_i].str; _i++) \ + if (!strcmp(opt_array[_i].str, v)) { \ + variable |= opt_array[_i].val; \ + break; \ + } \ + if (!opt_array[_i].str || !*opt_array[_i].str) \ + goto needs_val; \ + } + if (!opt || !*opt) + goto no_mount_options; + ntfs_debug("Entering with mount options string: %s", opt); + while ((p = strsep(&opt, ","))) { + if ((v = strchr(p, '='))) + *v++ = 0; + NTFS_GETOPT("uid", uid) + else NTFS_GETOPT("gid", gid) + else NTFS_GETOPT("umask", fmask = dmask) + else NTFS_GETOPT("fmask", fmask) + else NTFS_GETOPT("dmask", dmask) + else NTFS_GETOPT("mft_zone_multiplier", mft_zone_multiplier) + else NTFS_GETOPT_WITH_DEFAULT("sloppy", sloppy, TRUE) + else NTFS_GETOPT_BOOL("show_sys_files", show_sys_files) + else NTFS_GETOPT_BOOL("case_sensitive", case_sensitive) + else NTFS_GETOPT_OPTIONS_ARRAY("errors", on_errors, + on_errors_arr) + else if (!strcmp(p, "posix") || !strcmp(p, "show_inodes")) + ntfs_warning(vol->sb, "Ignoring obsolete option %s.", + p); + else if (!strcmp(p, "nls") || !strcmp(p, "iocharset")) { + if (!strcmp(p, "iocharset")) + ntfs_warning(vol->sb, "Option iocharset is " + "deprecated. Please use " + "option nls=<charsetname> in " + "the future."); + if (!v || !*v) + goto needs_arg; +use_utf8: + old_nls = nls_map; + nls_map = load_nls(v); + if (!nls_map) { + if (!old_nls) { + ntfs_error(vol->sb, "NLS character set " + "%s not found.", v); + return FALSE; + } + ntfs_error(vol->sb, "NLS character set %s not " + "found. Using previous one %s.", + v, old_nls->charset); + nls_map = old_nls; + } else /* nls_map */ { + if (old_nls) + unload_nls(old_nls); + } + } else if (!strcmp(p, "utf8")) { + BOOL val = FALSE; + ntfs_warning(vol->sb, "Option utf8 is no longer " + "supported, using option nls=utf8. Please " + "use option nls=utf8 in the future and " + "make sure utf8 is compiled either as a " + "module or into the kernel."); + if (!v || !*v) + val = TRUE; + else if (!simple_getbool(v, &val)) + goto needs_bool; + if (val) { + v = utf8; + goto use_utf8; + } + } else { + ntfs_error(vol->sb, "Unrecognized mount option %s.", p); + if (errors < INT_MAX) + errors++; + } +#undef NTFS_GETOPT_OPTIONS_ARRAY +#undef NTFS_GETOPT_BOOL +#undef NTFS_GETOPT +#undef NTFS_GETOPT_WITH_DEFAULT + } +no_mount_options: + if (errors && !sloppy) + return FALSE; + if (sloppy) + ntfs_warning(vol->sb, "Sloppy option given. Ignoring " + "unrecognized mount option(s) and continuing."); + /* Keep this first! */ + if (on_errors != -1) { + if (!on_errors) { + ntfs_error(vol->sb, "Invalid errors option argument " + "or bug in options parser."); + return FALSE; + } + } + if (nls_map) { + if (vol->nls_map && vol->nls_map != nls_map) { + ntfs_error(vol->sb, "Cannot change NLS character set " + "on remount."); + return FALSE; + } /* else (!vol->nls_map) */ + ntfs_debug("Using NLS character set %s.", nls_map->charset); + vol->nls_map = nls_map; + } else /* (!nls_map) */ { + if (!vol->nls_map) { + vol->nls_map = load_nls_default(); + if (!vol->nls_map) { + ntfs_error(vol->sb, "Failed to load default " + "NLS character set."); + return FALSE; + } + ntfs_debug("Using default NLS character set (%s).", + vol->nls_map->charset); + } + } + if (mft_zone_multiplier != -1) { + if (vol->mft_zone_multiplier && vol->mft_zone_multiplier != + mft_zone_multiplier) { + ntfs_error(vol->sb, "Cannot change mft_zone_multiplier " + "on remount."); + return FALSE; + } + if (mft_zone_multiplier < 1 || mft_zone_multiplier > 4) { + ntfs_error(vol->sb, "Invalid mft_zone_multiplier. " + "Using default value, i.e. 1."); + mft_zone_multiplier = 1; + } + vol->mft_zone_multiplier = mft_zone_multiplier; + } + if (!vol->mft_zone_multiplier) + vol->mft_zone_multiplier = 1; + if (on_errors != -1) + vol->on_errors = on_errors; + if (!vol->on_errors || vol->on_errors == ON_ERRORS_RECOVER) + vol->on_errors |= ON_ERRORS_CONTINUE; + if (uid != (uid_t)-1) + vol->uid = uid; + if (gid != (gid_t)-1) + vol->gid = gid; + if (fmask != (mode_t)-1) + vol->fmask = fmask; + if (dmask != (mode_t)-1) + vol->dmask = dmask; + if (show_sys_files != -1) { + if (show_sys_files) + NVolSetShowSystemFiles(vol); + else + NVolClearShowSystemFiles(vol); + } + if (case_sensitive != -1) { + if (case_sensitive) + NVolSetCaseSensitive(vol); + else + NVolClearCaseSensitive(vol); + } + return TRUE; +needs_arg: + ntfs_error(vol->sb, "The %s option requires an argument.", p); + return FALSE; +needs_bool: + ntfs_error(vol->sb, "The %s option requires a boolean argument.", p); + return FALSE; +needs_val: + ntfs_error(vol->sb, "Invalid %s option argument: %s", p, ov); + return FALSE; +} + +#ifdef NTFS_RW + +/** + * ntfs_write_volume_flags - write new flags to the volume information flags + * @vol: ntfs volume on which to modify the flags + * @flags: new flags value for the volume information flags + * + * Internal function. You probably want to use ntfs_{set,clear}_volume_flags() + * instead (see below). + * + * Replace the volume information flags on the volume @vol with the value + * supplied in @flags. Note, this overwrites the volume information flags, so + * make sure to combine the flags you want to modify with the old flags and use + * the result when calling ntfs_write_volume_flags(). + * + * Return 0 on success and -errno on error. + */ +static int ntfs_write_volume_flags(ntfs_volume *vol, const VOLUME_FLAGS flags) +{ + ntfs_inode *ni = NTFS_I(vol->vol_ino); + MFT_RECORD *m; + VOLUME_INFORMATION *vi; + ntfs_attr_search_ctx *ctx; + int err; + + ntfs_debug("Entering, old flags = 0x%x, new flags = 0x%x.", + le16_to_cpu(vol->vol_flags), le16_to_cpu(flags)); + if (vol->vol_flags == flags) + goto done; + BUG_ON(!ni); + m = map_mft_record(ni); + if (IS_ERR(m)) { + err = PTR_ERR(m); + goto err_out; + } + ctx = ntfs_attr_get_search_ctx(ni, m); + if (!ctx) { + err = -ENOMEM; + goto put_unm_err_out; + } + err = ntfs_attr_lookup(AT_VOLUME_INFORMATION, NULL, 0, 0, 0, NULL, 0, + ctx); + if (err) + goto put_unm_err_out; + vi = (VOLUME_INFORMATION*)((u8*)ctx->attr + + le16_to_cpu(ctx->attr->data.resident.value_offset)); + vol->vol_flags = vi->flags = flags; + flush_dcache_mft_record_page(ctx->ntfs_ino); + mark_mft_record_dirty(ctx->ntfs_ino); + ntfs_attr_put_search_ctx(ctx); + unmap_mft_record(ni); +done: + ntfs_debug("Done."); + return 0; +put_unm_err_out: + if (ctx) + ntfs_attr_put_search_ctx(ctx); + unmap_mft_record(ni); +err_out: + ntfs_error(vol->sb, "Failed with error code %i.", -err); + return err; +} + +/** + * ntfs_set_volume_flags - set bits in the volume information flags + * @vol: ntfs volume on which to modify the flags + * @flags: flags to set on the volume + * + * Set the bits in @flags in the volume information flags on the volume @vol. + * + * Return 0 on success and -errno on error. + */ +static inline int ntfs_set_volume_flags(ntfs_volume *vol, VOLUME_FLAGS flags) +{ + flags &= VOLUME_FLAGS_MASK; + return ntfs_write_volume_flags(vol, vol->vol_flags | flags); +} + +/** + * ntfs_clear_volume_flags - clear bits in the volume information flags + * @vol: ntfs volume on which to modify the flags + * @flags: flags to clear on the volume + * + * Clear the bits in @flags in the volume information flags on the volume @vol. + * + * Return 0 on success and -errno on error. + */ +static inline int ntfs_clear_volume_flags(ntfs_volume *vol, VOLUME_FLAGS flags) +{ + flags &= VOLUME_FLAGS_MASK; + flags = vol->vol_flags & cpu_to_le16(~le16_to_cpu(flags)); + return ntfs_write_volume_flags(vol, flags); +} + +#endif /* NTFS_RW */ + +/** + * ntfs_remount - change the mount options of a mounted ntfs filesystem + * @sb: superblock of mounted ntfs filesystem + * @flags: remount flags + * @opt: remount options string + * + * Change the mount options of an already mounted ntfs filesystem. + * + * NOTE: The VFS sets the @sb->s_flags remount flags to @flags after + * ntfs_remount() returns successfully (i.e. returns 0). Otherwise, + * @sb->s_flags are not changed. + */ +static int ntfs_remount(struct super_block *sb, int *flags, char *opt) +{ + ntfs_volume *vol = NTFS_SB(sb); + + ntfs_debug("Entering with remount options string: %s", opt); +#ifndef NTFS_RW + /* For read-only compiled driver, enforce all read-only flags. */ + *flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME; +#else /* NTFS_RW */ + /* + * For the read-write compiled driver, if we are remounting read-write, + * make sure there are no volume errors and that no unsupported volume + * flags are set. Also, empty the logfile journal as it would become + * stale as soon as something is written to the volume and mark the + * volume dirty so that chkdsk is run if the volume is not umounted + * cleanly. Finally, mark the quotas out of date so Windows rescans + * the volume on boot and updates them. + * + * When remounting read-only, mark the volume clean if no volume errors + * have occured. + */ + if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) { + static const char *es = ". Cannot remount read-write."; + + /* Remounting read-write. */ + if (NVolErrors(vol)) { + ntfs_error(sb, "Volume has errors and is read-only%s", + es); + return -EROFS; + } + if (vol->vol_flags & VOLUME_IS_DIRTY) { + ntfs_error(sb, "Volume is dirty and read-only%s", es); + return -EROFS; + } + if (vol->vol_flags & VOLUME_MUST_MOUNT_RO_MASK) { + ntfs_error(sb, "Volume has unsupported flags set and " + "is read-only%s", es); + return -EROFS; + } + if (ntfs_set_volume_flags(vol, VOLUME_IS_DIRTY)) { + ntfs_error(sb, "Failed to set dirty bit in volume " + "information flags%s", es); + return -EROFS; + } +#if 0 + // TODO: Enable this code once we start modifying anything that + // is different between NTFS 1.2 and 3.x... + /* Set NT4 compatibility flag on newer NTFS version volumes. */ + if ((vol->major_ver > 1)) { + if (ntfs_set_volume_flags(vol, VOLUME_MOUNTED_ON_NT4)) { + ntfs_error(sb, "Failed to set NT4 " + "compatibility flag%s", es); + NVolSetErrors(vol); + return -EROFS; + } + } +#endif + if (!ntfs_empty_logfile(vol->logfile_ino)) { + ntfs_error(sb, "Failed to empty journal $LogFile%s", + es); + NVolSetErrors(vol); + return -EROFS; + } + if (!ntfs_mark_quotas_out_of_date(vol)) { + ntfs_error(sb, "Failed to mark quotas out of date%s", + es); + NVolSetErrors(vol); + return -EROFS; + } + } else if (!(sb->s_flags & MS_RDONLY) && (*flags & MS_RDONLY)) { + /* Remounting read-only. */ + if (!NVolErrors(vol)) { + if (ntfs_clear_volume_flags(vol, VOLUME_IS_DIRTY)) + ntfs_warning(sb, "Failed to clear dirty bit " + "in volume information " + "flags. Run chkdsk."); + } + } +#endif /* NTFS_RW */ + + // TODO: Deal with *flags. + + if (!parse_options(vol, opt)) + return -EINVAL; + ntfs_debug("Done."); + return 0; +} + +/** + * is_boot_sector_ntfs - check whether a boot sector is a valid NTFS boot sector + * @sb: Super block of the device to which @b belongs. + * @b: Boot sector of device @sb to check. + * @silent: If TRUE, all output will be silenced. + * + * is_boot_sector_ntfs() checks whether the boot sector @b is a valid NTFS boot + * sector. Returns TRUE if it is valid and FALSE if not. + * + * @sb is only needed for warning/error output, i.e. it can be NULL when silent + * is TRUE. + */ +static BOOL is_boot_sector_ntfs(const struct super_block *sb, + const NTFS_BOOT_SECTOR *b, const BOOL silent) +{ + /* + * Check that checksum == sum of u32 values from b to the checksum + * field. If checksum is zero, no checking is done. + */ + if ((void*)b < (void*)&b->checksum && b->checksum) { + le32 *u; + u32 i; + + for (i = 0, u = (le32*)b; u < (le32*)(&b->checksum); ++u) + i += le32_to_cpup(u); + if (le32_to_cpu(b->checksum) != i) + goto not_ntfs; + } + /* Check OEMidentifier is "NTFS " */ + if (b->oem_id != magicNTFS) + goto not_ntfs; + /* Check bytes per sector value is between 256 and 4096. */ + if (le16_to_cpu(b->bpb.bytes_per_sector) < 0x100 || + le16_to_cpu(b->bpb.bytes_per_sector) > 0x1000) + goto not_ntfs; + /* Check sectors per cluster value is valid. */ + switch (b->bpb.sectors_per_cluster) { + case 1: case 2: case 4: case 8: case 16: case 32: case 64: case 128: + break; + default: + goto not_ntfs; + } + /* Check the cluster size is not above 65536 bytes. */ + if ((u32)le16_to_cpu(b->bpb.bytes_per_sector) * + b->bpb.sectors_per_cluster > 0x10000) + goto not_ntfs; + /* Check reserved/unused fields are really zero. */ + if (le16_to_cpu(b->bpb.reserved_sectors) || + le16_to_cpu(b->bpb.root_entries) || + le16_to_cpu(b->bpb.sectors) || + le16_to_cpu(b->bpb.sectors_per_fat) || + le32_to_cpu(b->bpb.large_sectors) || b->bpb.fats) + goto not_ntfs; + /* Check clusters per file mft record value is valid. */ + if ((u8)b->clusters_per_mft_record < 0xe1 || + (u8)b->clusters_per_mft_record > 0xf7) + switch (b->clusters_per_mft_record) { + case 1: case 2: case 4: case 8: case 16: case 32: case 64: + break; + default: + goto not_ntfs; + } + /* Check clusters per index block value is valid. */ + if ((u8)b->clusters_per_index_record < 0xe1 || + (u8)b->clusters_per_index_record > 0xf7) + switch (b->clusters_per_index_record) { + case 1: case 2: case 4: case 8: case 16: case 32: case 64: + break; + default: + goto not_ntfs; + } + /* + * Check for valid end of sector marker. We will work without it, but + * many BIOSes will refuse to boot from a bootsector if the magic is + * incorrect, so we emit a warning. + */ + if (!silent && b->end_of_sector_marker != cpu_to_le16(0xaa55)) + ntfs_warning(sb, "Invalid end of sector marker."); + return TRUE; +not_ntfs: + return FALSE; +} + +/** + * read_ntfs_boot_sector - read the NTFS boot sector of a device + * @sb: super block of device to read the boot sector from + * @silent: if true, suppress all output + * + * Reads the boot sector from the device and validates it. If that fails, tries + * to read the backup boot sector, first from the end of the device a-la NT4 and + * later and then from the middle of the device a-la NT3.51 and before. + * + * If a valid boot sector is found but it is not the primary boot sector, we + * repair the primary boot sector silently (unless the device is read-only or + * the primary boot sector is not accessible). + * + * NOTE: To call this function, @sb must have the fields s_dev, the ntfs super + * block (u.ntfs_sb), nr_blocks and the device flags (s_flags) initialized + * to their respective values. + * + * Return the unlocked buffer head containing the boot sector or NULL on error. + */ +static struct buffer_head *read_ntfs_boot_sector(struct super_block *sb, + const int silent) +{ + const char *read_err_str = "Unable to read %s boot sector."; + struct buffer_head *bh_primary, *bh_backup; + long nr_blocks = NTFS_SB(sb)->nr_blocks; + + /* Try to read primary boot sector. */ + if ((bh_primary = sb_bread(sb, 0))) { + if (is_boot_sector_ntfs(sb, (NTFS_BOOT_SECTOR*) + bh_primary->b_data, silent)) + return bh_primary; + if (!silent) + ntfs_error(sb, "Primary boot sector is invalid."); + } else if (!silent) + ntfs_error(sb, read_err_str, "primary"); + if (!(NTFS_SB(sb)->on_errors & ON_ERRORS_RECOVER)) { + if (bh_primary) + brelse(bh_primary); + if (!silent) + ntfs_error(sb, "Mount option errors=recover not used. " + "Aborting without trying to recover."); + return NULL; + } + /* Try to read NT4+ backup boot sector. */ + if ((bh_backup = sb_bread(sb, nr_blocks - 1))) { + if (is_boot_sector_ntfs(sb, (NTFS_BOOT_SECTOR*) + bh_backup->b_data, silent)) + goto hotfix_primary_boot_sector; + brelse(bh_backup); + } else if (!silent) + ntfs_error(sb, read_err_str, "backup"); + /* Try to read NT3.51- backup boot sector. */ + if ((bh_backup = sb_bread(sb, nr_blocks >> 1))) { + if (is_boot_sector_ntfs(sb, (NTFS_BOOT_SECTOR*) + bh_backup->b_data, silent)) + goto hotfix_primary_boot_sector; + if (!silent) + ntfs_error(sb, "Could not find a valid backup boot " + "sector."); + brelse(bh_backup); + } else if (!silent) + ntfs_error(sb, read_err_str, "backup"); + /* We failed. Cleanup and return. */ + if (bh_primary) + brelse(bh_primary); + return NULL; +hotfix_primary_boot_sector: + if (bh_primary) { + /* + * If we managed to read sector zero and the volume is not + * read-only, copy the found, valid backup boot sector to the + * primary boot sector. + */ + if (!(sb->s_flags & MS_RDONLY)) { + ntfs_warning(sb, "Hot-fix: Recovering invalid primary " + "boot sector from backup copy."); + memcpy(bh_primary->b_data, bh_backup->b_data, + sb->s_blocksize); + mark_buffer_dirty(bh_primary); + sync_dirty_buffer(bh_primary); + if (buffer_uptodate(bh_primary)) { + brelse(bh_backup); + return bh_primary; + } + ntfs_error(sb, "Hot-fix: Device write error while " + "recovering primary boot sector."); + } else { + ntfs_warning(sb, "Hot-fix: Recovery of primary boot " + "sector failed: Read-only mount."); + } + brelse(bh_primary); + } + ntfs_warning(sb, "Using backup boot sector."); + return bh_backup; +} + +/** + * parse_ntfs_boot_sector - parse the boot sector and store the data in @vol + * @vol: volume structure to initialise with data from boot sector + * @b: boot sector to parse + * + * Parse the ntfs boot sector @b and store all imporant information therein in + * the ntfs super block @vol. Return TRUE on success and FALSE on error. + */ +static BOOL parse_ntfs_boot_sector(ntfs_volume *vol, const NTFS_BOOT_SECTOR *b) +{ + unsigned int sectors_per_cluster_bits, nr_hidden_sects; + int clusters_per_mft_record, clusters_per_index_record; + s64 ll; + + vol->sector_size = le16_to_cpu(b->bpb.bytes_per_sector); + vol->sector_size_bits = ffs(vol->sector_size) - 1; + ntfs_debug("vol->sector_size = %i (0x%x)", vol->sector_size, + vol->sector_size); + ntfs_debug("vol->sector_size_bits = %i (0x%x)", vol->sector_size_bits, + vol->sector_size_bits); + if (vol->sector_size != vol->sb->s_blocksize) + ntfs_warning(vol->sb, "The boot sector indicates a sector size " + "different from the device sector size."); + ntfs_debug("sectors_per_cluster = 0x%x", b->bpb.sectors_per_cluster); + sectors_per_cluster_bits = ffs(b->bpb.sectors_per_cluster) - 1; + ntfs_debug("sectors_per_cluster_bits = 0x%x", + sectors_per_cluster_bits); + nr_hidden_sects = le32_to_cpu(b->bpb.hidden_sectors); + ntfs_debug("number of hidden sectors = 0x%x", nr_hidden_sects); + vol->cluster_size = vol->sector_size << sectors_per_cluster_bits; + vol->cluster_size_mask = vol->cluster_size - 1; + vol->cluster_size_bits = ffs(vol->cluster_size) - 1; + ntfs_debug("vol->cluster_size = %i (0x%x)", vol->cluster_size, + vol->cluster_size); + ntfs_debug("vol->cluster_size_mask = 0x%x", vol->cluster_size_mask); + ntfs_debug("vol->cluster_size_bits = %i (0x%x)", + vol->cluster_size_bits, vol->cluster_size_bits); + if (vol->sector_size > vol->cluster_size) { + ntfs_error(vol->sb, "Sector sizes above the cluster size are " + "not supported. Sorry."); + return FALSE; + } + if (vol->sb->s_blocksize > vol->cluster_size) { + ntfs_error(vol->sb, "Cluster sizes smaller than the device " + "sector size are not supported. Sorry."); + return FALSE; + } + clusters_per_mft_record = b->clusters_per_mft_record; + ntfs_debug("clusters_per_mft_record = %i (0x%x)", + clusters_per_mft_record, clusters_per_mft_record); + if (clusters_per_mft_record > 0) + vol->mft_record_size = vol->cluster_size << + (ffs(clusters_per_mft_record) - 1); + else + /* + * When mft_record_size < cluster_size, clusters_per_mft_record + * = -log2(mft_record_size) bytes. mft_record_size normaly is + * 1024 bytes, which is encoded as 0xF6 (-10 in decimal). + */ + vol->mft_record_size = 1 << -clusters_per_mft_record; + vol->mft_record_size_mask = vol->mft_record_size - 1; + vol->mft_record_size_bits = ffs(vol->mft_record_size) - 1; + ntfs_debug("vol->mft_record_size = %i (0x%x)", vol->mft_record_size, + vol->mft_record_size); + ntfs_debug("vol->mft_record_size_mask = 0x%x", + vol->mft_record_size_mask); + ntfs_debug("vol->mft_record_size_bits = %i (0x%x)", + vol->mft_record_size_bits, vol->mft_record_size_bits); + /* + * We cannot support mft record sizes above the PAGE_CACHE_SIZE since + * we store $MFT/$DATA, the table of mft records in the page cache. + */ + if (vol->mft_record_size > PAGE_CACHE_SIZE) { + ntfs_error(vol->sb, "Mft record size %i (0x%x) exceeds the " + "page cache size on your system %lu (0x%lx). " + "This is not supported. Sorry.", + vol->mft_record_size, vol->mft_record_size, + PAGE_CACHE_SIZE, PAGE_CACHE_SIZE); + return FALSE; + } + clusters_per_index_record = b->clusters_per_index_record; + ntfs_debug("clusters_per_index_record = %i (0x%x)", + clusters_per_index_record, clusters_per_index_record); + if (clusters_per_index_record > 0) + vol->index_record_size = vol->cluster_size << + (ffs(clusters_per_index_record) - 1); + else + /* + * When index_record_size < cluster_size, + * clusters_per_index_record = -log2(index_record_size) bytes. + * index_record_size normaly equals 4096 bytes, which is + * encoded as 0xF4 (-12 in decimal). + */ + vol->index_record_size = 1 << -clusters_per_index_record; + vol->index_record_size_mask = vol->index_record_size - 1; + vol->index_record_size_bits = ffs(vol->index_record_size) - 1; + ntfs_debug("vol->index_record_size = %i (0x%x)", + vol->index_record_size, vol->index_record_size); + ntfs_debug("vol->index_record_size_mask = 0x%x", + vol->index_record_size_mask); + ntfs_debug("vol->index_record_size_bits = %i (0x%x)", + vol->index_record_size_bits, + vol->index_record_size_bits); + /* + * Get the size of the volume in clusters and check for 64-bit-ness. + * Windows currently only uses 32 bits to save the clusters so we do + * the same as it is much faster on 32-bit CPUs. + */ + ll = sle64_to_cpu(b->number_of_sectors) >> sectors_per_cluster_bits; + if ((u64)ll >= 1ULL << 32) { + ntfs_error(vol->sb, "Cannot handle 64-bit clusters. Sorry."); + return FALSE; + } + vol->nr_clusters = ll; + ntfs_debug("vol->nr_clusters = 0x%llx", (long long)vol->nr_clusters); + /* + * On an architecture where unsigned long is 32-bits, we restrict the + * volume size to 2TiB (2^41). On a 64-bit architecture, the compiler + * will hopefully optimize the whole check away. + */ + if (sizeof(unsigned long) < 8) { + if ((ll << vol->cluster_size_bits) >= (1ULL << 41)) { + ntfs_error(vol->sb, "Volume size (%lluTiB) is too " + "large for this architecture. " + "Maximum supported is 2TiB. Sorry.", + (unsigned long long)ll >> (40 - + vol->cluster_size_bits)); + return FALSE; + } + } + ll = sle64_to_cpu(b->mft_lcn); + if (ll >= vol->nr_clusters) { + ntfs_error(vol->sb, "MFT LCN is beyond end of volume. Weird."); + return FALSE; + } + vol->mft_lcn = ll; + ntfs_debug("vol->mft_lcn = 0x%llx", (long long)vol->mft_lcn); + ll = sle64_to_cpu(b->mftmirr_lcn); + if (ll >= vol->nr_clusters) { + ntfs_error(vol->sb, "MFTMirr LCN is beyond end of volume. " + "Weird."); + return FALSE; + } + vol->mftmirr_lcn = ll; + ntfs_debug("vol->mftmirr_lcn = 0x%llx", (long long)vol->mftmirr_lcn); +#ifdef NTFS_RW + /* + * Work out the size of the mft mirror in number of mft records. If the + * cluster size is less than or equal to the size taken by four mft + * records, the mft mirror stores the first four mft records. If the + * cluster size is bigger than the size taken by four mft records, the + * mft mirror contains as many mft records as will fit into one + * cluster. + */ + if (vol->cluster_size <= (4 << vol->mft_record_size_bits)) + vol->mftmirr_size = 4; + else + vol->mftmirr_size = vol->cluster_size >> + vol->mft_record_size_bits; + ntfs_debug("vol->mftmirr_size = %i", vol->mftmirr_size); +#endif /* NTFS_RW */ + vol->serial_no = le64_to_cpu(b->volume_serial_number); + ntfs_debug("vol->serial_no = 0x%llx", + (unsigned long long)vol->serial_no); + return TRUE; +} + +/** + * ntfs_setup_allocators - initialize the cluster and mft allocators + * @vol: volume structure for which to setup the allocators + * + * Setup the cluster (lcn) and mft allocators to the starting values. + */ +static void ntfs_setup_allocators(ntfs_volume *vol) +{ +#ifdef NTFS_RW + LCN mft_zone_size, mft_lcn; +#endif /* NTFS_RW */ + + ntfs_debug("vol->mft_zone_multiplier = 0x%x", + vol->mft_zone_multiplier); +#ifdef NTFS_RW + /* Determine the size of the MFT zone. */ + mft_zone_size = vol->nr_clusters; + switch (vol->mft_zone_multiplier) { /* % of volume size in clusters */ + case 4: + mft_zone_size >>= 1; /* 50% */ + break; + case 3: + mft_zone_size = (mft_zone_size + + (mft_zone_size >> 1)) >> 2; /* 37.5% */ + break; + case 2: + mft_zone_size >>= 2; /* 25% */ + break; + /* case 1: */ + default: + mft_zone_size >>= 3; /* 12.5% */ + break; + } + /* Setup the mft zone. */ + vol->mft_zone_start = vol->mft_zone_pos = vol->mft_lcn; + ntfs_debug("vol->mft_zone_pos = 0x%llx", + (unsigned long long)vol->mft_zone_pos); + /* + * Calculate the mft_lcn for an unmodified NTFS volume (see mkntfs + * source) and if the actual mft_lcn is in the expected place or even + * further to the front of the volume, extend the mft_zone to cover the + * beginning of the volume as well. This is in order to protect the + * area reserved for the mft bitmap as well within the mft_zone itself. + * On non-standard volumes we do not protect it as the overhead would + * be higher than the speed increase we would get by doing it. + */ + mft_lcn = (8192 + 2 * vol->cluster_size - 1) / vol->cluster_size; + if (mft_lcn * vol->cluster_size < 16 * 1024) + mft_lcn = (16 * 1024 + vol->cluster_size - 1) / + vol->cluster_size; + if (vol->mft_zone_start <= mft_lcn) + vol->mft_zone_start = 0; + ntfs_debug("vol->mft_zone_start = 0x%llx", + (unsigned long long)vol->mft_zone_start); + /* + * Need to cap the mft zone on non-standard volumes so that it does + * not point outside the boundaries of the volume. We do this by + * halving the zone size until we are inside the volume. + */ + vol->mft_zone_end = vol->mft_lcn + mft_zone_size; + while (vol->mft_zone_end >= vol->nr_clusters) { + mft_zone_size >>= 1; + vol->mft_zone_end = vol->mft_lcn + mft_zone_size; + } + ntfs_debug("vol->mft_zone_end = 0x%llx", + (unsigned long long)vol->mft_zone_end); + /* + * Set the current position within each data zone to the start of the + * respective zone. + */ + vol->data1_zone_pos = vol->mft_zone_end; + ntfs_debug("vol->data1_zone_pos = 0x%llx", + (unsigned long long)vol->data1_zone_pos); + vol->data2_zone_pos = 0; + ntfs_debug("vol->data2_zone_pos = 0x%llx", + (unsigned long long)vol->data2_zone_pos); + + /* Set the mft data allocation position to mft record 24. */ + vol->mft_data_pos = 24; + ntfs_debug("vol->mft_data_pos = 0x%llx", + (unsigned long long)vol->mft_data_pos); +#endif /* NTFS_RW */ +} + +#ifdef NTFS_RW + +/** + * load_and_init_mft_mirror - load and setup the mft mirror inode for a volume + * @vol: ntfs super block describing device whose mft mirror to load + * + * Return TRUE on success or FALSE on error. + */ +static BOOL load_and_init_mft_mirror(ntfs_volume *vol) +{ + struct inode *tmp_ino; + ntfs_inode *tmp_ni; + + ntfs_debug("Entering."); + /* Get mft mirror inode. */ + tmp_ino = ntfs_iget(vol->sb, FILE_MFTMirr); + if (IS_ERR(tmp_ino) || is_bad_inode(tmp_ino)) { + if (!IS_ERR(tmp_ino)) + iput(tmp_ino); + /* Caller will display error message. */ + return FALSE; + } + /* + * Re-initialize some specifics about $MFTMirr's inode as + * ntfs_read_inode() will have set up the default ones. + */ + /* Set uid and gid to root. */ + tmp_ino->i_uid = tmp_ino->i_gid = 0; + /* Regular file. No access for anyone. */ + tmp_ino->i_mode = S_IFREG; + /* No VFS initiated operations allowed for $MFTMirr. */ + tmp_ino->i_op = &ntfs_empty_inode_ops; + tmp_ino->i_fop = &ntfs_empty_file_ops; + /* Put in our special address space operations. */ + tmp_ino->i_mapping->a_ops = &ntfs_mst_aops; + tmp_ni = NTFS_I(tmp_ino); + /* The $MFTMirr, like the $MFT is multi sector transfer protected. */ + NInoSetMstProtected(tmp_ni); + /* + * Set up our little cheat allowing us to reuse the async read io + * completion handler for directories. + */ + tmp_ni->itype.index.block_size = vol->mft_record_size; + tmp_ni->itype.index.block_size_bits = vol->mft_record_size_bits; + vol->mftmirr_ino = tmp_ino; + ntfs_debug("Done."); + return TRUE; +} + +/** + * check_mft_mirror - compare contents of the mft mirror with the mft + * @vol: ntfs super block describing device whose mft mirror to check + * + * Return TRUE on success or FALSE on error. + * + * Note, this function also results in the mft mirror runlist being completely + * mapped into memory. The mft mirror write code requires this and will BUG() + * should it find an unmapped runlist element. + */ +static BOOL check_mft_mirror(ntfs_volume *vol) +{ + unsigned long index; + struct super_block *sb = vol->sb; + ntfs_inode *mirr_ni; + struct page *mft_page, *mirr_page; + u8 *kmft, *kmirr; + runlist_element *rl, rl2[2]; + int mrecs_per_page, i; + + ntfs_debug("Entering."); + /* Compare contents of $MFT and $MFTMirr. */ + mrecs_per_page = PAGE_CACHE_SIZE / vol->mft_record_size; + BUG_ON(!mrecs_per_page); + BUG_ON(!vol->mftmirr_size); + mft_page = mirr_page = NULL; + kmft = kmirr = NULL; + index = i = 0; + do { + u32 bytes; + + /* Switch pages if necessary. */ + if (!(i % mrecs_per_page)) { + if (index) { + ntfs_unmap_page(mft_page); + ntfs_unmap_page(mirr_page); + } + /* Get the $MFT page. */ + mft_page = ntfs_map_page(vol->mft_ino->i_mapping, + index); + if (IS_ERR(mft_page)) { + ntfs_error(sb, "Failed to read $MFT."); + return FALSE; + } + kmft = page_address(mft_page); + /* Get the $MFTMirr page. */ + mirr_page = ntfs_map_page(vol->mftmirr_ino->i_mapping, + index); + if (IS_ERR(mirr_page)) { + ntfs_error(sb, "Failed to read $MFTMirr."); + goto mft_unmap_out; + } + kmirr = page_address(mirr_page); + ++index; + } + /* Make sure the record is ok. */ + if (ntfs_is_baad_recordp((le32*)kmft)) { + ntfs_error(sb, "Incomplete multi sector transfer " + "detected in mft record %i.", i); +mm_unmap_out: + ntfs_unmap_page(mirr_page); +mft_unmap_out: + ntfs_unmap_page(mft_page); + return FALSE; + } + if (ntfs_is_baad_recordp((le32*)kmirr)) { + ntfs_error(sb, "Incomplete multi sector transfer " + "detected in mft mirror record %i.", i); + goto mm_unmap_out; + } + /* Get the amount of data in the current record. */ + bytes = le32_to_cpu(((MFT_RECORD*)kmft)->bytes_in_use); + if (!bytes || bytes > vol->mft_record_size) { + bytes = le32_to_cpu(((MFT_RECORD*)kmirr)->bytes_in_use); + if (!bytes || bytes > vol->mft_record_size) + bytes = vol->mft_record_size; + } + /* Compare the two records. */ + if (memcmp(kmft, kmirr, bytes)) { + ntfs_error(sb, "$MFT and $MFTMirr (record %i) do not " + "match. Run ntfsfix or chkdsk.", i); + goto mm_unmap_out; + } + kmft += vol->mft_record_size; + kmirr += vol->mft_record_size; + } while (++i < vol->mftmirr_size); + /* Release the last pages. */ + ntfs_unmap_page(mft_page); + ntfs_unmap_page(mirr_page); + + /* Construct the mft mirror runlist by hand. */ + rl2[0].vcn = 0; + rl2[0].lcn = vol->mftmirr_lcn; + rl2[0].length = (vol->mftmirr_size * vol->mft_record_size + + vol->cluster_size - 1) / vol->cluster_size; + rl2[1].vcn = rl2[0].length; + rl2[1].lcn = LCN_ENOENT; + rl2[1].length = 0; + /* + * Because we have just read all of the mft mirror, we know we have + * mapped the full runlist for it. + */ + mirr_ni = NTFS_I(vol->mftmirr_ino); + down_read(&mirr_ni->runlist.lock); + rl = mirr_ni->runlist.rl; + /* Compare the two runlists. They must be identical. */ + i = 0; + do { + if (rl2[i].vcn != rl[i].vcn || rl2[i].lcn != rl[i].lcn || + rl2[i].length != rl[i].length) { + ntfs_error(sb, "$MFTMirr location mismatch. " + "Run chkdsk."); + up_read(&mirr_ni->runlist.lock); + return FALSE; + } + } while (rl2[i++].length); + up_read(&mirr_ni->runlist.lock); + ntfs_debug("Done."); + return TRUE; +} + +/** + * load_and_check_logfile - load and check the logfile inode for a volume + * @vol: ntfs super block describing device whose logfile to load + * + * Return TRUE on success or FALSE on error. + */ +static BOOL load_and_check_logfile(ntfs_volume *vol) +{ + struct inode *tmp_ino; + + ntfs_debug("Entering."); + tmp_ino = ntfs_iget(vol->sb, FILE_LogFile); + if (IS_ERR(tmp_ino) || is_bad_inode(tmp_ino)) { + if (!IS_ERR(tmp_ino)) + iput(tmp_ino); + /* Caller will display error message. */ + return FALSE; + } + if (!ntfs_check_logfile(tmp_ino)) { + iput(tmp_ino); + /* ntfs_check_logfile() will have displayed error output. */ + return FALSE; + } + vol->logfile_ino = tmp_ino; + ntfs_debug("Done."); + return TRUE; +} + +/** + * load_and_init_quota - load and setup the quota file for a volume if present + * @vol: ntfs super block describing device whose quota file to load + * + * Return TRUE on success or FALSE on error. If $Quota is not present, we + * leave vol->quota_ino as NULL and return success. + */ +static BOOL load_and_init_quota(ntfs_volume *vol) +{ + MFT_REF mref; + struct inode *tmp_ino; + ntfs_name *name = NULL; + static const ntfschar Quota[7] = { const_cpu_to_le16('$'), + const_cpu_to_le16('Q'), const_cpu_to_le16('u'), + const_cpu_to_le16('o'), const_cpu_to_le16('t'), + const_cpu_to_le16('a'), 0 }; + static ntfschar Q[3] = { const_cpu_to_le16('$'), + const_cpu_to_le16('Q'), 0 }; + + ntfs_debug("Entering."); + /* + * Find the inode number for the quota file by looking up the filename + * $Quota in the extended system files directory $Extend. + */ + down(&vol->extend_ino->i_sem); + mref = ntfs_lookup_inode_by_name(NTFS_I(vol->extend_ino), Quota, 6, + &name); + up(&vol->extend_ino->i_sem); + if (IS_ERR_MREF(mref)) { + /* + * If the file does not exist, quotas are disabled and have + * never been enabled on this volume, just return success. + */ + if (MREF_ERR(mref) == -ENOENT) { + ntfs_debug("$Quota not present. Volume does not have " + "quotas enabled."); + /* + * No need to try to set quotas out of date if they are + * not enabled. + */ + NVolSetQuotaOutOfDate(vol); + return TRUE; + } + /* A real error occured. */ + ntfs_error(vol->sb, "Failed to find inode number for $Quota."); + return FALSE; + } + /* We do not care for the type of match that was found. */ + if (name) + kfree(name); + /* Get the inode. */ + tmp_ino = ntfs_iget(vol->sb, MREF(mref)); + if (IS_ERR(tmp_ino) || is_bad_inode(tmp_ino)) { + if (!IS_ERR(tmp_ino)) + iput(tmp_ino); + ntfs_error(vol->sb, "Failed to load $Quota."); + return FALSE; + } + vol->quota_ino = tmp_ino; + /* Get the $Q index allocation attribute. */ + tmp_ino = ntfs_index_iget(vol->quota_ino, Q, 2); + if (IS_ERR(tmp_ino)) { + ntfs_error(vol->sb, "Failed to load $Quota/$Q index."); + return FALSE; + } + vol->quota_q_ino = tmp_ino; + ntfs_debug("Done."); + return TRUE; +} + +/** + * load_and_init_attrdef - load the attribute definitions table for a volume + * @vol: ntfs super block describing device whose attrdef to load + * + * Return TRUE on success or FALSE on error. + */ +static BOOL load_and_init_attrdef(ntfs_volume *vol) +{ + struct super_block *sb = vol->sb; + struct inode *ino; + struct page *page; + unsigned long index, max_index; + unsigned int size; + + ntfs_debug("Entering."); + /* Read attrdef table and setup vol->attrdef and vol->attrdef_size. */ + ino = ntfs_iget(sb, FILE_AttrDef); + if (IS_ERR(ino) || is_bad_inode(ino)) { + if (!IS_ERR(ino)) + iput(ino); + goto failed; + } + /* The size of FILE_AttrDef must be above 0 and fit inside 31 bits. */ + if (!ino->i_size || ino->i_size > 0x7fffffff) + goto iput_failed; + vol->attrdef = (ATTR_DEF*)ntfs_malloc_nofs(ino->i_size); + if (!vol->attrdef) + goto iput_failed; + index = 0; + max_index = ino->i_size >> PAGE_CACHE_SHIFT; + size = PAGE_CACHE_SIZE; + while (index < max_index) { + /* Read the attrdef table and copy it into the linear buffer. */ +read_partial_attrdef_page: + page = ntfs_map_page(ino->i_mapping, index); + if (IS_ERR(page)) + goto free_iput_failed; + memcpy((u8*)vol->attrdef + (index++ << PAGE_CACHE_SHIFT), + page_address(page), size); + ntfs_unmap_page(page); + }; + if (size == PAGE_CACHE_SIZE) { + size = ino->i_size & ~PAGE_CACHE_MASK; + if (size) + goto read_partial_attrdef_page; + } + vol->attrdef_size = ino->i_size; + ntfs_debug("Read %llu bytes from $AttrDef.", ino->i_size); + iput(ino); + return TRUE; +free_iput_failed: + ntfs_free(vol->attrdef); + vol->attrdef = NULL; +iput_failed: + iput(ino); +failed: + ntfs_error(sb, "Failed to initialize attribute definition table."); + return FALSE; +} + +#endif /* NTFS_RW */ + +/** + * load_and_init_upcase - load the upcase table for an ntfs volume + * @vol: ntfs super block describing device whose upcase to load + * + * Return TRUE on success or FALSE on error. + */ +static BOOL load_and_init_upcase(ntfs_volume *vol) +{ + struct super_block *sb = vol->sb; + struct inode *ino; + struct page *page; + unsigned long index, max_index; + unsigned int size; + int i, max; + + ntfs_debug("Entering."); + /* Read upcase table and setup vol->upcase and vol->upcase_len. */ + ino = ntfs_iget(sb, FILE_UpCase); + if (IS_ERR(ino) || is_bad_inode(ino)) { + if (!IS_ERR(ino)) + iput(ino); + goto upcase_failed; + } + /* + * The upcase size must not be above 64k Unicode characters, must not + * be zero and must be a multiple of sizeof(ntfschar). + */ + if (!ino->i_size || ino->i_size & (sizeof(ntfschar) - 1) || + ino->i_size > 64ULL * 1024 * sizeof(ntfschar)) + goto iput_upcase_failed; + vol->upcase = (ntfschar*)ntfs_malloc_nofs(ino->i_size); + if (!vol->upcase) + goto iput_upcase_failed; + index = 0; + max_index = ino->i_size >> PAGE_CACHE_SHIFT; + size = PAGE_CACHE_SIZE; + while (index < max_index) { + /* Read the upcase table and copy it into the linear buffer. */ +read_partial_upcase_page: + page = ntfs_map_page(ino->i_mapping, index); + if (IS_ERR(page)) + goto iput_upcase_failed; + memcpy((char*)vol->upcase + (index++ << PAGE_CACHE_SHIFT), + page_address(page), size); + ntfs_unmap_page(page); + }; + if (size == PAGE_CACHE_SIZE) { + size = ino->i_size & ~PAGE_CACHE_MASK; + if (size) + goto read_partial_upcase_page; + } + vol->upcase_len = ino->i_size >> UCHAR_T_SIZE_BITS; + ntfs_debug("Read %llu bytes from $UpCase (expected %zu bytes).", + ino->i_size, 64 * 1024 * sizeof(ntfschar)); + iput(ino); + down(&ntfs_lock); + if (!default_upcase) { + ntfs_debug("Using volume specified $UpCase since default is " + "not present."); + up(&ntfs_lock); + return TRUE; + } + max = default_upcase_len; + if (max > vol->upcase_len) + max = vol->upcase_len; + for (i = 0; i < max; i++) + if (vol->upcase[i] != default_upcase[i]) + break; + if (i == max) { + ntfs_free(vol->upcase); + vol->upcase = default_upcase; + vol->upcase_len = max; + ntfs_nr_upcase_users++; + up(&ntfs_lock); + ntfs_debug("Volume specified $UpCase matches default. Using " + "default."); + return TRUE; + } + up(&ntfs_lock); + ntfs_debug("Using volume specified $UpCase since it does not match " + "the default."); + return TRUE; +iput_upcase_failed: + iput(ino); + ntfs_free(vol->upcase); + vol->upcase = NULL; +upcase_failed: + down(&ntfs_lock); + if (default_upcase) { + vol->upcase = default_upcase; + vol->upcase_len = default_upcase_len; + ntfs_nr_upcase_users++; + up(&ntfs_lock); + ntfs_error(sb, "Failed to load $UpCase from the volume. Using " + "default."); + return TRUE; + } + up(&ntfs_lock); + ntfs_error(sb, "Failed to initialize upcase table."); + return FALSE; +} + +/** + * load_system_files - open the system files using normal functions + * @vol: ntfs super block describing device whose system files to load + * + * Open the system files with normal access functions and complete setting up + * the ntfs super block @vol. + * + * Return TRUE on success or FALSE on error. + */ +static BOOL load_system_files(ntfs_volume *vol) +{ + struct super_block *sb = vol->sb; + MFT_RECORD *m; + VOLUME_INFORMATION *vi; + ntfs_attr_search_ctx *ctx; + + ntfs_debug("Entering."); +#ifdef NTFS_RW + /* Get mft mirror inode compare the contents of $MFT and $MFTMirr. */ + if (!load_and_init_mft_mirror(vol) || !check_mft_mirror(vol)) { + static const char *es1 = "Failed to load $MFTMirr"; + static const char *es2 = "$MFTMirr does not match $MFT"; + static const char *es3 = ". Run ntfsfix and/or chkdsk."; + + /* If a read-write mount, convert it to a read-only mount. */ + if (!(sb->s_flags & MS_RDONLY)) { + if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | + ON_ERRORS_CONTINUE))) { + ntfs_error(sb, "%s and neither on_errors=" + "continue nor on_errors=" + "remount-ro was specified%s", + !vol->mftmirr_ino ? es1 : es2, + es3); + goto iput_mirr_err_out; + } + sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME; + ntfs_error(sb, "%s. Mounting read-only%s", + !vol->mftmirr_ino ? es1 : es2, es3); + } else + ntfs_warning(sb, "%s. Will not be able to remount " + "read-write%s", + !vol->mftmirr_ino ? es1 : es2, es3); + /* This will prevent a read-write remount. */ + NVolSetErrors(vol); + } +#endif /* NTFS_RW */ + /* Get mft bitmap attribute inode. */ + vol->mftbmp_ino = ntfs_attr_iget(vol->mft_ino, AT_BITMAP, NULL, 0); + if (IS_ERR(vol->mftbmp_ino)) { + ntfs_error(sb, "Failed to load $MFT/$BITMAP attribute."); + goto iput_mirr_err_out; + } + /* Read upcase table and setup @vol->upcase and @vol->upcase_len. */ + if (!load_and_init_upcase(vol)) + goto iput_mftbmp_err_out; +#ifdef NTFS_RW + /* + * Read attribute definitions table and setup @vol->attrdef and + * @vol->attrdef_size. + */ + if (!load_and_init_attrdef(vol)) + goto iput_upcase_err_out; +#endif /* NTFS_RW */ + /* + * Get the cluster allocation bitmap inode and verify the size, no + * need for any locking at this stage as we are already running + * exclusively as we are mount in progress task. + */ + vol->lcnbmp_ino = ntfs_iget(sb, FILE_Bitmap); + if (IS_ERR(vol->lcnbmp_ino) || is_bad_inode(vol->lcnbmp_ino)) { + if (!IS_ERR(vol->lcnbmp_ino)) + iput(vol->lcnbmp_ino); + goto bitmap_failed; + } + if ((vol->nr_clusters + 7) >> 3 > vol->lcnbmp_ino->i_size) { + iput(vol->lcnbmp_ino); +bitmap_failed: + ntfs_error(sb, "Failed to load $Bitmap."); + goto iput_attrdef_err_out; + } + /* + * Get the volume inode and setup our cache of the volume flags and + * version. + */ + vol->vol_ino = ntfs_iget(sb, FILE_Volume); + if (IS_ERR(vol->vol_ino) || is_bad_inode(vol->vol_ino)) { + if (!IS_ERR(vol->vol_ino)) + iput(vol->vol_ino); +volume_failed: + ntfs_error(sb, "Failed to load $Volume."); + goto iput_lcnbmp_err_out; + } + m = map_mft_record(NTFS_I(vol->vol_ino)); + if (IS_ERR(m)) { +iput_volume_failed: + iput(vol->vol_ino); + goto volume_failed; + } + if (!(ctx = ntfs_attr_get_search_ctx(NTFS_I(vol->vol_ino), m))) { + ntfs_error(sb, "Failed to get attribute search context."); + goto get_ctx_vol_failed; + } + if (ntfs_attr_lookup(AT_VOLUME_INFORMATION, NULL, 0, 0, 0, NULL, 0, + ctx) || ctx->attr->non_resident || ctx->attr->flags) { +err_put_vol: + ntfs_attr_put_search_ctx(ctx); +get_ctx_vol_failed: + unmap_mft_record(NTFS_I(vol->vol_ino)); + goto iput_volume_failed; + } + vi = (VOLUME_INFORMATION*)((char*)ctx->attr + + le16_to_cpu(ctx->attr->data.resident.value_offset)); + /* Some bounds checks. */ + if ((u8*)vi < (u8*)ctx->attr || (u8*)vi + + le32_to_cpu(ctx->attr->data.resident.value_length) > + (u8*)ctx->attr + le32_to_cpu(ctx->attr->length)) + goto err_put_vol; + /* Copy the volume flags and version to the ntfs_volume structure. */ + vol->vol_flags = vi->flags; + vol->major_ver = vi->major_ver; + vol->minor_ver = vi->minor_ver; + ntfs_attr_put_search_ctx(ctx); + unmap_mft_record(NTFS_I(vol->vol_ino)); + printk(KERN_INFO "NTFS volume version %i.%i.\n", vol->major_ver, + vol->minor_ver); +#ifdef NTFS_RW + /* Make sure that no unsupported volume flags are set. */ + if (vol->vol_flags & VOLUME_MUST_MOUNT_RO_MASK) { + static const char *es1a = "Volume is dirty"; + static const char *es1b = "Volume has unsupported flags set"; + static const char *es2 = ". Run chkdsk and mount in Windows."; + const char *es1; + + es1 = vol->vol_flags & VOLUME_IS_DIRTY ? es1a : es1b; + /* If a read-write mount, convert it to a read-only mount. */ + if (!(sb->s_flags & MS_RDONLY)) { + if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | + ON_ERRORS_CONTINUE))) { + ntfs_error(sb, "%s and neither on_errors=" + "continue nor on_errors=" + "remount-ro was specified%s", + es1, es2); + goto iput_vol_err_out; + } + sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME; + ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); + } else + ntfs_warning(sb, "%s. Will not be able to remount " + "read-write%s", es1, es2); + /* + * Do not set NVolErrors() because ntfs_remount() re-checks the + * flags which we need to do in case any flags have changed. + */ + } + /* + * Get the inode for the logfile, check it and determine if the volume + * was shutdown cleanly. + */ + if (!load_and_check_logfile(vol) || + !ntfs_is_logfile_clean(vol->logfile_ino)) { + static const char *es1a = "Failed to load $LogFile"; + static const char *es1b = "$LogFile is not clean"; + static const char *es2 = ". Mount in Windows."; + const char *es1; + + es1 = !vol->logfile_ino ? es1a : es1b; + /* If a read-write mount, convert it to a read-only mount. */ + if (!(sb->s_flags & MS_RDONLY)) { + if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | + ON_ERRORS_CONTINUE))) { + ntfs_error(sb, "%s and neither on_errors=" + "continue nor on_errors=" + "remount-ro was specified%s", + es1, es2); + goto iput_logfile_err_out; + } + sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME; + ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); + } else + ntfs_warning(sb, "%s. Will not be able to remount " + "read-write%s", es1, es2); + /* This will prevent a read-write remount. */ + NVolSetErrors(vol); + } + /* If (still) a read-write mount, mark the volume dirty. */ + if (!(sb->s_flags & MS_RDONLY) && + ntfs_set_volume_flags(vol, VOLUME_IS_DIRTY)) { + static const char *es1 = "Failed to set dirty bit in volume " + "information flags"; + static const char *es2 = ". Run chkdsk."; + + /* Convert to a read-only mount. */ + if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | + ON_ERRORS_CONTINUE))) { + ntfs_error(sb, "%s and neither on_errors=continue nor " + "on_errors=remount-ro was specified%s", + es1, es2); + goto iput_logfile_err_out; + } + ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); + sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME; + /* + * Do not set NVolErrors() because ntfs_remount() might manage + * to set the dirty flag in which case all would be well. + */ + } +#if 0 + // TODO: Enable this code once we start modifying anything that is + // different between NTFS 1.2 and 3.x... + /* + * If (still) a read-write mount, set the NT4 compatibility flag on + * newer NTFS version volumes. + */ + if (!(sb->s_flags & MS_RDONLY) && (vol->major_ver > 1) && + ntfs_set_volume_flags(vol, VOLUME_MOUNTED_ON_NT4)) { + static const char *es1 = "Failed to set NT4 compatibility flag"; + static const char *es2 = ". Run chkdsk."; + + /* Convert to a read-only mount. */ + if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | + ON_ERRORS_CONTINUE))) { + ntfs_error(sb, "%s and neither on_errors=continue nor " + "on_errors=remount-ro was specified%s", + es1, es2); + goto iput_logfile_err_out; + } + ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); + sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME; + NVolSetErrors(vol); + } +#endif + /* If (still) a read-write mount, empty the logfile. */ + if (!(sb->s_flags & MS_RDONLY) && + !ntfs_empty_logfile(vol->logfile_ino)) { + static const char *es1 = "Failed to empty $LogFile"; + static const char *es2 = ". Mount in Windows."; + + /* Convert to a read-only mount. */ + if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | + ON_ERRORS_CONTINUE))) { + ntfs_error(sb, "%s and neither on_errors=continue nor " + "on_errors=remount-ro was specified%s", + es1, es2); + goto iput_logfile_err_out; + } + ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); + sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME; + NVolSetErrors(vol); + } +#endif /* NTFS_RW */ + /* Get the root directory inode. */ + vol->root_ino = ntfs_iget(sb, FILE_root); + if (IS_ERR(vol->root_ino) || is_bad_inode(vol->root_ino)) { + if (!IS_ERR(vol->root_ino)) + iput(vol->root_ino); + ntfs_error(sb, "Failed to load root directory."); + goto iput_logfile_err_out; + } + /* If on NTFS versions before 3.0, we are done. */ + if (vol->major_ver < 3) + return TRUE; + /* NTFS 3.0+ specific initialization. */ + /* Get the security descriptors inode. */ + vol->secure_ino = ntfs_iget(sb, FILE_Secure); + if (IS_ERR(vol->secure_ino) || is_bad_inode(vol->secure_ino)) { + if (!IS_ERR(vol->secure_ino)) + iput(vol->secure_ino); + ntfs_error(sb, "Failed to load $Secure."); + goto iput_root_err_out; + } + // FIXME: Initialize security. + /* Get the extended system files' directory inode. */ + vol->extend_ino = ntfs_iget(sb, FILE_Extend); + if (IS_ERR(vol->extend_ino) || is_bad_inode(vol->extend_ino)) { + if (!IS_ERR(vol->extend_ino)) + iput(vol->extend_ino); + ntfs_error(sb, "Failed to load $Extend."); + goto iput_sec_err_out; + } +#ifdef NTFS_RW + /* Find the quota file, load it if present, and set it up. */ + if (!load_and_init_quota(vol)) { + static const char *es1 = "Failed to load $Quota"; + static const char *es2 = ". Run chkdsk."; + + /* If a read-write mount, convert it to a read-only mount. */ + if (!(sb->s_flags & MS_RDONLY)) { + if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | + ON_ERRORS_CONTINUE))) { + ntfs_error(sb, "%s and neither on_errors=" + "continue nor on_errors=" + "remount-ro was specified%s", + es1, es2); + goto iput_quota_err_out; + } + sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME; + ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); + } else + ntfs_warning(sb, "%s. Will not be able to remount " + "read-write%s", es1, es2); + /* This will prevent a read-write remount. */ + NVolSetErrors(vol); + } + /* If (still) a read-write mount, mark the quotas out of date. */ + if (!(sb->s_flags & MS_RDONLY) && + !ntfs_mark_quotas_out_of_date(vol)) { + static const char *es1 = "Failed to mark quotas out of date"; + static const char *es2 = ". Run chkdsk."; + + /* Convert to a read-only mount. */ + if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | + ON_ERRORS_CONTINUE))) { + ntfs_error(sb, "%s and neither on_errors=continue nor " + "on_errors=remount-ro was specified%s", + es1, es2); + goto iput_quota_err_out; + } + ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); + sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME; + NVolSetErrors(vol); + } + // TODO: Delete or checkpoint the $UsnJrnl if it exists. +#endif /* NTFS_RW */ + return TRUE; +#ifdef NTFS_RW +iput_quota_err_out: + if (vol->quota_q_ino) + iput(vol->quota_q_ino); + if (vol->quota_ino) + iput(vol->quota_ino); + iput(vol->extend_ino); +#endif /* NTFS_RW */ +iput_sec_err_out: + iput(vol->secure_ino); +iput_root_err_out: + iput(vol->root_ino); +iput_logfile_err_out: +#ifdef NTFS_RW + if (vol->logfile_ino) + iput(vol->logfile_ino); +iput_vol_err_out: +#endif /* NTFS_RW */ + iput(vol->vol_ino); +iput_lcnbmp_err_out: + iput(vol->lcnbmp_ino); +iput_attrdef_err_out: + vol->attrdef_size = 0; + if (vol->attrdef) { + ntfs_free(vol->attrdef); + vol->attrdef = NULL; + } +#ifdef NTFS_RW +iput_upcase_err_out: +#endif /* NTFS_RW */ + vol->upcase_len = 0; + down(&ntfs_lock); + if (vol->upcase == default_upcase) { + ntfs_nr_upcase_users--; + vol->upcase = NULL; + } + up(&ntfs_lock); + if (vol->upcase) { + ntfs_free(vol->upcase); + vol->upcase = NULL; + } +iput_mftbmp_err_out: + iput(vol->mftbmp_ino); +iput_mirr_err_out: +#ifdef NTFS_RW + if (vol->mftmirr_ino) + iput(vol->mftmirr_ino); +#endif /* NTFS_RW */ + return FALSE; +} + +/** + * ntfs_put_super - called by the vfs to unmount a volume + * @sb: vfs superblock of volume to unmount + * + * ntfs_put_super() is called by the VFS (from fs/super.c::do_umount()) when + * the volume is being unmounted (umount system call has been invoked) and it + * releases all inodes and memory belonging to the NTFS specific part of the + * super block. + */ +static void ntfs_put_super(struct super_block *sb) +{ + ntfs_volume *vol = NTFS_SB(sb); + + ntfs_debug("Entering."); +#ifdef NTFS_RW + /* + * Commit all inodes while they are still open in case some of them + * cause others to be dirtied. + */ + ntfs_commit_inode(vol->vol_ino); + + /* NTFS 3.0+ specific. */ + if (vol->major_ver >= 3) { + if (vol->quota_q_ino) + ntfs_commit_inode(vol->quota_q_ino); + if (vol->quota_ino) + ntfs_commit_inode(vol->quota_ino); + if (vol->extend_ino) + ntfs_commit_inode(vol->extend_ino); + if (vol->secure_ino) + ntfs_commit_inode(vol->secure_ino); + } + + ntfs_commit_inode(vol->root_ino); + + down_write(&vol->lcnbmp_lock); + ntfs_commit_inode(vol->lcnbmp_ino); + up_write(&vol->lcnbmp_lock); + + down_write(&vol->mftbmp_lock); + ntfs_commit_inode(vol->mftbmp_ino); + up_write(&vol->mftbmp_lock); + + if (vol->logfile_ino) + ntfs_commit_inode(vol->logfile_ino); + + if (vol->mftmirr_ino) + ntfs_commit_inode(vol->mftmirr_ino); + ntfs_commit_inode(vol->mft_ino); + + /* + * If a read-write mount and no volume errors have occured, mark the + * volume clean. Also, re-commit all affected inodes. + */ + if (!(sb->s_flags & MS_RDONLY)) { + if (!NVolErrors(vol)) { + if (ntfs_clear_volume_flags(vol, VOLUME_IS_DIRTY)) + ntfs_warning(sb, "Failed to clear dirty bit " + "in volume information " + "flags. Run chkdsk."); + ntfs_commit_inode(vol->vol_ino); + ntfs_commit_inode(vol->root_ino); + if (vol->mftmirr_ino) + ntfs_commit_inode(vol->mftmirr_ino); + ntfs_commit_inode(vol->mft_ino); + } else { + ntfs_warning(sb, "Volume has errors. Leaving volume " + "marked dirty. Run chkdsk."); + } + } +#endif /* NTFS_RW */ + + iput(vol->vol_ino); + vol->vol_ino = NULL; + + /* NTFS 3.0+ specific clean up. */ + if (vol->major_ver >= 3) { +#ifdef NTFS_RW + if (vol->quota_q_ino) { + iput(vol->quota_q_ino); + vol->quota_q_ino = NULL; + } + if (vol->quota_ino) { + iput(vol->quota_ino); + vol->quota_ino = NULL; + } +#endif /* NTFS_RW */ + if (vol->extend_ino) { + iput(vol->extend_ino); + vol->extend_ino = NULL; + } + if (vol->secure_ino) { + iput(vol->secure_ino); + vol->secure_ino = NULL; + } + } + + iput(vol->root_ino); + vol->root_ino = NULL; + + down_write(&vol->lcnbmp_lock); + iput(vol->lcnbmp_ino); + vol->lcnbmp_ino = NULL; + up_write(&vol->lcnbmp_lock); + + down_write(&vol->mftbmp_lock); + iput(vol->mftbmp_ino); + vol->mftbmp_ino = NULL; + up_write(&vol->mftbmp_lock); + +#ifdef NTFS_RW + if (vol->logfile_ino) { + iput(vol->logfile_ino); + vol->logfile_ino = NULL; + } + if (vol->mftmirr_ino) { + /* Re-commit the mft mirror and mft just in case. */ + ntfs_commit_inode(vol->mftmirr_ino); + ntfs_commit_inode(vol->mft_ino); + iput(vol->mftmirr_ino); + vol->mftmirr_ino = NULL; + } + /* + * If any dirty inodes are left, throw away all mft data page cache + * pages to allow a clean umount. This should never happen any more + * due to mft.c::ntfs_mft_writepage() cleaning all the dirty pages as + * the underlying mft records are written out and cleaned. If it does, + * happen anyway, we want to know... + */ + ntfs_commit_inode(vol->mft_ino); + write_inode_now(vol->mft_ino, 1); + if (!list_empty(&sb->s_dirty)) { + const char *s1, *s2; + + down(&vol->mft_ino->i_sem); + truncate_inode_pages(vol->mft_ino->i_mapping, 0); + up(&vol->mft_ino->i_sem); + write_inode_now(vol->mft_ino, 1); + if (!list_empty(&sb->s_dirty)) { + static const char *_s1 = "inodes"; + static const char *_s2 = ""; + s1 = _s1; + s2 = _s2; + } else { + static const char *_s1 = "mft pages"; + static const char *_s2 = "They have been thrown " + "away. "; + s1 = _s1; + s2 = _s2; + } + ntfs_error(sb, "Dirty %s found at umount time. %sYou should " + "run chkdsk. Please email " + "linux-ntfs-dev@lists.sourceforge.net and say " + "that you saw this message. Thank you.", s1, + s2); + } +#endif /* NTFS_RW */ + + iput(vol->mft_ino); + vol->mft_ino = NULL; + + /* Throw away the table of attribute definitions. */ + vol->attrdef_size = 0; + if (vol->attrdef) { + ntfs_free(vol->attrdef); + vol->attrdef = NULL; + } + vol->upcase_len = 0; + /* + * Destroy the global default upcase table if necessary. Also decrease + * the number of upcase users if we are a user. + */ + down(&ntfs_lock); + if (vol->upcase == default_upcase) { + ntfs_nr_upcase_users--; + vol->upcase = NULL; + } + if (!ntfs_nr_upcase_users && default_upcase) { + ntfs_free(default_upcase); + default_upcase = NULL; + } + if (vol->cluster_size <= 4096 && !--ntfs_nr_compression_users) + free_compression_buffers(); + up(&ntfs_lock); + if (vol->upcase) { + ntfs_free(vol->upcase); + vol->upcase = NULL; + } + if (vol->nls_map) { + unload_nls(vol->nls_map); + vol->nls_map = NULL; + } + sb->s_fs_info = NULL; + kfree(vol); + return; +} + +/** + * get_nr_free_clusters - return the number of free clusters on a volume + * @vol: ntfs volume for which to obtain free cluster count + * + * Calculate the number of free clusters on the mounted NTFS volume @vol. We + * actually calculate the number of clusters in use instead because this + * allows us to not care about partial pages as these will be just zero filled + * and hence not be counted as allocated clusters. + * + * The only particularity is that clusters beyond the end of the logical ntfs + * volume will be marked as allocated to prevent errors which means we have to + * discount those at the end. This is important as the cluster bitmap always + * has a size in multiples of 8 bytes, i.e. up to 63 clusters could be outside + * the logical volume and marked in use when they are not as they do not exist. + * + * If any pages cannot be read we assume all clusters in the erroring pages are + * in use. This means we return an underestimate on errors which is better than + * an overestimate. + */ +static s64 get_nr_free_clusters(ntfs_volume *vol) +{ + s64 nr_free = vol->nr_clusters; + u32 *kaddr; + struct address_space *mapping = vol->lcnbmp_ino->i_mapping; + filler_t *readpage = (filler_t*)mapping->a_ops->readpage; + struct page *page; + unsigned long index, max_index; + unsigned int max_size; + + ntfs_debug("Entering."); + /* Serialize accesses to the cluster bitmap. */ + down_read(&vol->lcnbmp_lock); + /* + * Convert the number of bits into bytes rounded up, then convert into + * multiples of PAGE_CACHE_SIZE, rounding up so that if we have one + * full and one partial page max_index = 2. + */ + max_index = (((vol->nr_clusters + 7) >> 3) + PAGE_CACHE_SIZE - 1) >> + PAGE_CACHE_SHIFT; + /* Use multiples of 4 bytes. */ + max_size = PAGE_CACHE_SIZE >> 2; + ntfs_debug("Reading $Bitmap, max_index = 0x%lx, max_size = 0x%x.", + max_index, max_size); + for (index = 0UL; index < max_index; index++) { + unsigned int i; + /* + * Read the page from page cache, getting it from backing store + * if necessary, and increment the use count. + */ + page = read_cache_page(mapping, index, (filler_t*)readpage, + NULL); + /* Ignore pages which errored synchronously. */ + if (IS_ERR(page)) { + ntfs_debug("Sync read_cache_page() error. Skipping " + "page (index 0x%lx).", index); + nr_free -= PAGE_CACHE_SIZE * 8; + continue; + } + wait_on_page_locked(page); + /* Ignore pages which errored asynchronously. */ + if (!PageUptodate(page)) { + ntfs_debug("Async read_cache_page() error. Skipping " + "page (index 0x%lx).", index); + page_cache_release(page); + nr_free -= PAGE_CACHE_SIZE * 8; + continue; + } + kaddr = (u32*)kmap_atomic(page, KM_USER0); + /* + * For each 4 bytes, subtract the number of set bits. If this + * is the last page and it is partial we don't really care as + * it just means we do a little extra work but it won't affect + * the result as all out of range bytes are set to zero by + * ntfs_readpage(). + */ + for (i = 0; i < max_size; i++) + nr_free -= (s64)hweight32(kaddr[i]); + kunmap_atomic(kaddr, KM_USER0); + page_cache_release(page); + } + ntfs_debug("Finished reading $Bitmap, last index = 0x%lx.", index - 1); + /* + * Fixup for eventual bits outside logical ntfs volume (see function + * description above). + */ + if (vol->nr_clusters & 63) + nr_free += 64 - (vol->nr_clusters & 63); + up_read(&vol->lcnbmp_lock); + /* If errors occured we may well have gone below zero, fix this. */ + if (nr_free < 0) + nr_free = 0; + ntfs_debug("Exiting."); + return nr_free; +} + +/** + * __get_nr_free_mft_records - return the number of free inodes on a volume + * @vol: ntfs volume for which to obtain free inode count + * + * Calculate the number of free mft records (inodes) on the mounted NTFS + * volume @vol. We actually calculate the number of mft records in use instead + * because this allows us to not care about partial pages as these will be just + * zero filled and hence not be counted as allocated mft record. + * + * If any pages cannot be read we assume all mft records in the erroring pages + * are in use. This means we return an underestimate on errors which is better + * than an overestimate. + * + * NOTE: Caller must hold mftbmp_lock rw_semaphore for reading or writing. + */ +static unsigned long __get_nr_free_mft_records(ntfs_volume *vol) +{ + s64 nr_free; + u32 *kaddr; + struct address_space *mapping = vol->mftbmp_ino->i_mapping; + filler_t *readpage = (filler_t*)mapping->a_ops->readpage; + struct page *page; + unsigned long index, max_index; + unsigned int max_size; + + ntfs_debug("Entering."); + /* Number of mft records in file system (at this point in time). */ + nr_free = vol->mft_ino->i_size >> vol->mft_record_size_bits; + /* + * Convert the maximum number of set bits into bytes rounded up, then + * convert into multiples of PAGE_CACHE_SIZE, rounding up so that if we + * have one full and one partial page max_index = 2. + */ + max_index = ((((NTFS_I(vol->mft_ino)->initialized_size >> + vol->mft_record_size_bits) + 7) >> 3) + + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; + /* Use multiples of 4 bytes. */ + max_size = PAGE_CACHE_SIZE >> 2; + ntfs_debug("Reading $MFT/$BITMAP, max_index = 0x%lx, max_size = " + "0x%x.", max_index, max_size); + for (index = 0UL; index < max_index; index++) { + unsigned int i; + /* + * Read the page from page cache, getting it from backing store + * if necessary, and increment the use count. + */ + page = read_cache_page(mapping, index, (filler_t*)readpage, + NULL); + /* Ignore pages which errored synchronously. */ + if (IS_ERR(page)) { + ntfs_debug("Sync read_cache_page() error. Skipping " + "page (index 0x%lx).", index); + nr_free -= PAGE_CACHE_SIZE * 8; + continue; + } + wait_on_page_locked(page); + /* Ignore pages which errored asynchronously. */ + if (!PageUptodate(page)) { + ntfs_debug("Async read_cache_page() error. Skipping " + "page (index 0x%lx).", index); + page_cache_release(page); + nr_free -= PAGE_CACHE_SIZE * 8; + continue; + } + kaddr = (u32*)kmap_atomic(page, KM_USER0); + /* + * For each 4 bytes, subtract the number of set bits. If this + * is the last page and it is partial we don't really care as + * it just means we do a little extra work but it won't affect + * the result as all out of range bytes are set to zero by + * ntfs_readpage(). + */ + for (i = 0; i < max_size; i++) + nr_free -= (s64)hweight32(kaddr[i]); + kunmap_atomic(kaddr, KM_USER0); + page_cache_release(page); + } + ntfs_debug("Finished reading $MFT/$BITMAP, last index = 0x%lx.", + index - 1); + /* If errors occured we may well have gone below zero, fix this. */ + if (nr_free < 0) + nr_free = 0; + ntfs_debug("Exiting."); + return nr_free; +} + +/** + * ntfs_statfs - return information about mounted NTFS volume + * @sb: super block of mounted volume + * @sfs: statfs structure in which to return the information + * + * Return information about the mounted NTFS volume @sb in the statfs structure + * pointed to by @sfs (this is initialized with zeros before ntfs_statfs is + * called). We interpret the values to be correct of the moment in time at + * which we are called. Most values are variable otherwise and this isn't just + * the free values but the totals as well. For example we can increase the + * total number of file nodes if we run out and we can keep doing this until + * there is no more space on the volume left at all. + * + * Called from vfs_statfs which is used to handle the statfs, fstatfs, and + * ustat system calls. + * + * Return 0 on success or -errno on error. + */ +static int ntfs_statfs(struct super_block *sb, struct kstatfs *sfs) +{ + ntfs_volume *vol = NTFS_SB(sb); + s64 size; + + ntfs_debug("Entering."); + /* Type of filesystem. */ + sfs->f_type = NTFS_SB_MAGIC; + /* Optimal transfer block size. */ + sfs->f_bsize = PAGE_CACHE_SIZE; + /* + * Total data blocks in file system in units of f_bsize and since + * inodes are also stored in data blocs ($MFT is a file) this is just + * the total clusters. + */ + sfs->f_blocks = vol->nr_clusters << vol->cluster_size_bits >> + PAGE_CACHE_SHIFT; + /* Free data blocks in file system in units of f_bsize. */ + size = get_nr_free_clusters(vol) << vol->cluster_size_bits >> + PAGE_CACHE_SHIFT; + if (size < 0LL) + size = 0LL; + /* Free blocks avail to non-superuser, same as above on NTFS. */ + sfs->f_bavail = sfs->f_bfree = size; + /* Serialize accesses to the inode bitmap. */ + down_read(&vol->mftbmp_lock); + /* Number of inodes in file system (at this point in time). */ + sfs->f_files = vol->mft_ino->i_size >> vol->mft_record_size_bits; + /* Free inodes in fs (based on current total count). */ + sfs->f_ffree = __get_nr_free_mft_records(vol); + up_read(&vol->mftbmp_lock); + /* + * File system id. This is extremely *nix flavour dependent and even + * within Linux itself all fs do their own thing. I interpret this to + * mean a unique id associated with the mounted fs and not the id + * associated with the file system driver, the latter is already given + * by the file system type in sfs->f_type. Thus we use the 64-bit + * volume serial number splitting it into two 32-bit parts. We enter + * the least significant 32-bits in f_fsid[0] and the most significant + * 32-bits in f_fsid[1]. + */ + sfs->f_fsid.val[0] = vol->serial_no & 0xffffffff; + sfs->f_fsid.val[1] = (vol->serial_no >> 32) & 0xffffffff; + /* Maximum length of filenames. */ + sfs->f_namelen = NTFS_MAX_NAME_LEN; + return 0; +} + +/** + * The complete super operations. + */ +static struct super_operations ntfs_sops = { + .alloc_inode = ntfs_alloc_big_inode, /* VFS: Allocate new inode. */ + .destroy_inode = ntfs_destroy_big_inode, /* VFS: Deallocate inode. */ + .put_inode = ntfs_put_inode, /* VFS: Called just before + the inode reference count + is decreased. */ +#ifdef NTFS_RW + //.dirty_inode = NULL, /* VFS: Called from + // __mark_inode_dirty(). */ + .write_inode = ntfs_write_inode, /* VFS: Write dirty inode to + disk. */ + //.drop_inode = NULL, /* VFS: Called just after the + // inode reference count has + // been decreased to zero. + // NOTE: The inode lock is + // held. See fs/inode.c:: + // generic_drop_inode(). */ + //.delete_inode = NULL, /* VFS: Delete inode from disk. + // Called when i_count becomes + // 0 and i_nlink is also 0. */ + //.write_super = NULL, /* Flush dirty super block to + // disk. */ + //.sync_fs = NULL, /* ? */ + //.write_super_lockfs = NULL, /* ? */ + //.unlockfs = NULL, /* ? */ +#endif /* NTFS_RW */ + .put_super = ntfs_put_super, /* Syscall: umount. */ + .statfs = ntfs_statfs, /* Syscall: statfs */ + .remount_fs = ntfs_remount, /* Syscall: mount -o remount. */ + .clear_inode = ntfs_clear_big_inode, /* VFS: Called when an inode is + removed from memory. */ + //.umount_begin = NULL, /* Forced umount. */ + .show_options = ntfs_show_options, /* Show mount options in + proc. */ +}; + + +/** + * Declarations for NTFS specific export operations (fs/ntfs/namei.c). + */ +extern struct dentry *ntfs_get_parent(struct dentry *child_dent); +extern struct dentry *ntfs_get_dentry(struct super_block *sb, void *fh); + +/** + * Export operations allowing NFS exporting of mounted NTFS partitions. + * + * We use the default ->decode_fh() and ->encode_fh() for now. Note that they + * use 32 bits to store the inode number which is an unsigned long so on 64-bit + * architectures is usually 64 bits so it would all fail horribly on huge + * volumes. I guess we need to define our own encode and decode fh functions + * that store 64-bit inode numbers at some point but for now we will ignore the + * problem... + * + * We also use the default ->get_name() helper (used by ->decode_fh() via + * fs/exportfs/expfs.c::find_exported_dentry()) as that is completely fs + * independent. + * + * The default ->get_parent() just returns -EACCES so we have to provide our + * own and the default ->get_dentry() is incompatible with NTFS due to not + * allowing the inode number 0 which is used in NTFS for the system file $MFT + * and due to using iget() whereas NTFS needs ntfs_iget(). + */ +static struct export_operations ntfs_export_ops = { + .get_parent = ntfs_get_parent, /* Find the parent of a given + directory. */ + .get_dentry = ntfs_get_dentry, /* Find a dentry for the inode + given a file handle + sub-fragment. */ +}; + +/** + * ntfs_fill_super - mount an ntfs files system + * @sb: super block of ntfs file system to mount + * @opt: string containing the mount options + * @silent: silence error output + * + * ntfs_fill_super() is called by the VFS to mount the device described by @sb + * with the mount otions in @data with the NTFS file system. + * + * If @silent is true, remain silent even if errors are detected. This is used + * during bootup, when the kernel tries to mount the root file system with all + * registered file systems one after the other until one succeeds. This implies + * that all file systems except the correct one will quite correctly and + * expectedly return an error, but nobody wants to see error messages when in + * fact this is what is supposed to happen. + * + * NOTE: @sb->s_flags contains the mount options flags. + */ +static int ntfs_fill_super(struct super_block *sb, void *opt, const int silent) +{ + ntfs_volume *vol; + struct buffer_head *bh; + struct inode *tmp_ino; + int result; + + ntfs_debug("Entering."); +#ifndef NTFS_RW + sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME; +#endif /* ! NTFS_RW */ + /* Allocate a new ntfs_volume and place it in sb->s_fs_info. */ + sb->s_fs_info = kmalloc(sizeof(ntfs_volume), GFP_NOFS); + vol = NTFS_SB(sb); + if (!vol) { + if (!silent) + ntfs_error(sb, "Allocation of NTFS volume structure " + "failed. Aborting mount..."); + return -ENOMEM; + } + /* Initialize ntfs_volume structure. */ + memset(vol, 0, sizeof(ntfs_volume)); + vol->sb = sb; + vol->upcase = NULL; + vol->attrdef = NULL; + vol->mft_ino = NULL; + vol->mftbmp_ino = NULL; + init_rwsem(&vol->mftbmp_lock); +#ifdef NTFS_RW + vol->mftmirr_ino = NULL; + vol->logfile_ino = NULL; +#endif /* NTFS_RW */ + vol->lcnbmp_ino = NULL; + init_rwsem(&vol->lcnbmp_lock); + vol->vol_ino = NULL; + vol->root_ino = NULL; + vol->secure_ino = NULL; + vol->extend_ino = NULL; +#ifdef NTFS_RW + vol->quota_ino = NULL; + vol->quota_q_ino = NULL; +#endif /* NTFS_RW */ + vol->nls_map = NULL; + + /* + * Default is group and other don't have any access to files or + * directories while owner has full access. Further, files by default + * are not executable but directories are of course browseable. + */ + vol->fmask = 0177; + vol->dmask = 0077; + + unlock_kernel(); + + /* Important to get the mount options dealt with now. */ + if (!parse_options(vol, (char*)opt)) + goto err_out_now; + + /* + * TODO: Fail safety check. In the future we should really be able to + * cope with this being the case, but for now just bail out. + */ + if (bdev_hardsect_size(sb->s_bdev) > NTFS_BLOCK_SIZE) { + if (!silent) + ntfs_error(sb, "Device has unsupported hardsect_size."); + goto err_out_now; + } + + /* Setup the device access block size to NTFS_BLOCK_SIZE. */ + if (sb_set_blocksize(sb, NTFS_BLOCK_SIZE) != NTFS_BLOCK_SIZE) { + if (!silent) + ntfs_error(sb, "Unable to set block size."); + goto err_out_now; + } + + /* Get the size of the device in units of NTFS_BLOCK_SIZE bytes. */ + vol->nr_blocks = sb->s_bdev->bd_inode->i_size >> NTFS_BLOCK_SIZE_BITS; + + /* Read the boot sector and return unlocked buffer head to it. */ + if (!(bh = read_ntfs_boot_sector(sb, silent))) { + if (!silent) + ntfs_error(sb, "Not an NTFS volume."); + goto err_out_now; + } + + /* + * Extract the data from the boot sector and setup the ntfs super block + * using it. + */ + result = parse_ntfs_boot_sector(vol, (NTFS_BOOT_SECTOR*)bh->b_data); + + /* Initialize the cluster and mft allocators. */ + ntfs_setup_allocators(vol); + + brelse(bh); + + if (!result) { + if (!silent) + ntfs_error(sb, "Unsupported NTFS filesystem."); + goto err_out_now; + } + + /* + * TODO: When we start coping with sector sizes different from + * NTFS_BLOCK_SIZE, we now probably need to set the blocksize of the + * device (probably to NTFS_BLOCK_SIZE). + */ + + /* Setup remaining fields in the super block. */ + sb->s_magic = NTFS_SB_MAGIC; + + /* + * Ntfs allows 63 bits for the file size, i.e. correct would be: + * sb->s_maxbytes = ~0ULL >> 1; + * But the kernel uses a long as the page cache page index which on + * 32-bit architectures is only 32-bits. MAX_LFS_FILESIZE is kernel + * defined to the maximum the page cache page index can cope with + * without overflowing the index or to 2^63 - 1, whichever is smaller. + */ + sb->s_maxbytes = MAX_LFS_FILESIZE; + + sb->s_time_gran = 100; + + /* + * Now load the metadata required for the page cache and our address + * space operations to function. We do this by setting up a specialised + * read_inode method and then just calling the normal iget() to obtain + * the inode for $MFT which is sufficient to allow our normal inode + * operations and associated address space operations to function. + */ + sb->s_op = &ntfs_sops; + tmp_ino = new_inode(sb); + if (!tmp_ino) { + if (!silent) + ntfs_error(sb, "Failed to load essential metadata."); + goto err_out_now; + } + tmp_ino->i_ino = FILE_MFT; + insert_inode_hash(tmp_ino); + if (ntfs_read_inode_mount(tmp_ino) < 0) { + if (!silent) + ntfs_error(sb, "Failed to load essential metadata."); + goto iput_tmp_ino_err_out_now; + } + down(&ntfs_lock); + /* + * The current mount is a compression user if the cluster size is + * less than or equal 4kiB. + */ + if (vol->cluster_size <= 4096 && !ntfs_nr_compression_users++) { + result = allocate_compression_buffers(); + if (result) { + ntfs_error(NULL, "Failed to allocate buffers " + "for compression engine."); + ntfs_nr_compression_users--; + up(&ntfs_lock); + goto iput_tmp_ino_err_out_now; + } + } + /* + * Generate the global default upcase table if necessary. Also + * temporarily increment the number of upcase users to avoid race + * conditions with concurrent (u)mounts. + */ + if (!default_upcase) + default_upcase = generate_default_upcase(); + ntfs_nr_upcase_users++; + up(&ntfs_lock); + /* + * From now on, ignore @silent parameter. If we fail below this line, + * it will be due to a corrupt fs or a system error, so we report it. + */ + /* + * Open the system files with normal access functions and complete + * setting up the ntfs super block. + */ + if (!load_system_files(vol)) { + ntfs_error(sb, "Failed to load system files."); + goto unl_upcase_iput_tmp_ino_err_out_now; + } + if ((sb->s_root = d_alloc_root(vol->root_ino))) { + /* We increment i_count simulating an ntfs_iget(). */ + atomic_inc(&vol->root_ino->i_count); + ntfs_debug("Exiting, status successful."); + /* Release the default upcase if it has no users. */ + down(&ntfs_lock); + if (!--ntfs_nr_upcase_users && default_upcase) { + ntfs_free(default_upcase); + default_upcase = NULL; + } + up(&ntfs_lock); + sb->s_export_op = &ntfs_export_ops; + lock_kernel(); + return 0; + } + ntfs_error(sb, "Failed to allocate root directory."); + /* Clean up after the successful load_system_files() call from above. */ + // TODO: Use ntfs_put_super() instead of repeating all this code... + // FIXME: Should mark the volume clean as the error is most likely + // -ENOMEM. + iput(vol->vol_ino); + vol->vol_ino = NULL; + /* NTFS 3.0+ specific clean up. */ + if (vol->major_ver >= 3) { +#ifdef NTFS_RW + if (vol->quota_q_ino) { + iput(vol->quota_q_ino); + vol->quota_q_ino = NULL; + } + if (vol->quota_ino) { + iput(vol->quota_ino); + vol->quota_ino = NULL; + } +#endif /* NTFS_RW */ + if (vol->extend_ino) { + iput(vol->extend_ino); + vol->extend_ino = NULL; + } + if (vol->secure_ino) { + iput(vol->secure_ino); + vol->secure_ino = NULL; + } + } + iput(vol->root_ino); + vol->root_ino = NULL; + iput(vol->lcnbmp_ino); + vol->lcnbmp_ino = NULL; + iput(vol->mftbmp_ino); + vol->mftbmp_ino = NULL; +#ifdef NTFS_RW + if (vol->logfile_ino) { + iput(vol->logfile_ino); + vol->logfile_ino = NULL; + } + if (vol->mftmirr_ino) { + iput(vol->mftmirr_ino); + vol->mftmirr_ino = NULL; + } +#endif /* NTFS_RW */ + /* Throw away the table of attribute definitions. */ + vol->attrdef_size = 0; + if (vol->attrdef) { + ntfs_free(vol->attrdef); + vol->attrdef = NULL; + } + vol->upcase_len = 0; + down(&ntfs_lock); + if (vol->upcase == default_upcase) { + ntfs_nr_upcase_users--; + vol->upcase = NULL; + } + up(&ntfs_lock); + if (vol->upcase) { + ntfs_free(vol->upcase); + vol->upcase = NULL; + } + if (vol->nls_map) { + unload_nls(vol->nls_map); + vol->nls_map = NULL; + } + /* Error exit code path. */ +unl_upcase_iput_tmp_ino_err_out_now: + /* + * Decrease the number of upcase users and destroy the global default + * upcase table if necessary. + */ + down(&ntfs_lock); + if (!--ntfs_nr_upcase_users && default_upcase) { + ntfs_free(default_upcase); + default_upcase = NULL; + } + if (vol->cluster_size <= 4096 && !--ntfs_nr_compression_users) + free_compression_buffers(); + up(&ntfs_lock); +iput_tmp_ino_err_out_now: + iput(tmp_ino); + if (vol->mft_ino && vol->mft_ino != tmp_ino) + iput(vol->mft_ino); + vol->mft_ino = NULL; + /* + * This is needed to get ntfs_clear_extent_inode() called for each + * inode we have ever called ntfs_iget()/iput() on, otherwise we A) + * leak resources and B) a subsequent mount fails automatically due to + * ntfs_iget() never calling down into our ntfs_read_locked_inode() + * method again... FIXME: Do we need to do this twice now because of + * attribute inodes? I think not, so leave as is for now... (AIA) + */ + if (invalidate_inodes(sb)) { + ntfs_error(sb, "Busy inodes left. This is most likely a NTFS " + "driver bug."); + /* Copied from fs/super.c. I just love this message. (-; */ + printk("NTFS: Busy inodes after umount. Self-destruct in 5 " + "seconds. Have a nice day...\n"); + } + /* Errors at this stage are irrelevant. */ +err_out_now: + lock_kernel(); + sb->s_fs_info = NULL; + kfree(vol); + ntfs_debug("Failed, returning -EINVAL."); + return -EINVAL; +} + +/* + * This is a slab cache to optimize allocations and deallocations of Unicode + * strings of the maximum length allowed by NTFS, which is NTFS_MAX_NAME_LEN + * (255) Unicode characters + a terminating NULL Unicode character. + */ +kmem_cache_t *ntfs_name_cache; + +/* Slab caches for efficient allocation/deallocation of of inodes. */ +kmem_cache_t *ntfs_inode_cache; +kmem_cache_t *ntfs_big_inode_cache; + +/* Init once constructor for the inode slab cache. */ +static void ntfs_big_inode_init_once(void *foo, kmem_cache_t *cachep, + unsigned long flags) +{ + ntfs_inode *ni = (ntfs_inode *)foo; + + if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == + SLAB_CTOR_CONSTRUCTOR) + inode_init_once(VFS_I(ni)); +} + +/* + * Slab caches to optimize allocations and deallocations of attribute search + * contexts and index contexts, respectively. + */ +kmem_cache_t *ntfs_attr_ctx_cache; +kmem_cache_t *ntfs_index_ctx_cache; + +/* Driver wide semaphore. */ +DECLARE_MUTEX(ntfs_lock); + +static struct super_block *ntfs_get_sb(struct file_system_type *fs_type, + int flags, const char *dev_name, void *data) +{ + return get_sb_bdev(fs_type, flags, dev_name, data, ntfs_fill_super); +} + +static struct file_system_type ntfs_fs_type = { + .owner = THIS_MODULE, + .name = "ntfs", + .get_sb = ntfs_get_sb, + .kill_sb = kill_block_super, + .fs_flags = FS_REQUIRES_DEV, +}; + +/* Stable names for the slab caches. */ +static const char ntfs_index_ctx_cache_name[] = "ntfs_index_ctx_cache"; +static const char ntfs_attr_ctx_cache_name[] = "ntfs_attr_ctx_cache"; +static const char ntfs_name_cache_name[] = "ntfs_name_cache"; +static const char ntfs_inode_cache_name[] = "ntfs_inode_cache"; +static const char ntfs_big_inode_cache_name[] = "ntfs_big_inode_cache"; + +static int __init init_ntfs_fs(void) +{ + int err = 0; + + /* This may be ugly but it results in pretty output so who cares. (-8 */ + printk(KERN_INFO "NTFS driver " NTFS_VERSION " [Flags: R/" +#ifdef NTFS_RW + "W" +#else + "O" +#endif +#ifdef DEBUG + " DEBUG" +#endif +#ifdef MODULE + " MODULE" +#endif + "].\n"); + + ntfs_debug("Debug messages are enabled."); + + ntfs_index_ctx_cache = kmem_cache_create(ntfs_index_ctx_cache_name, + sizeof(ntfs_index_context), 0 /* offset */, + SLAB_HWCACHE_ALIGN, NULL /* ctor */, NULL /* dtor */); + if (!ntfs_index_ctx_cache) { + printk(KERN_CRIT "NTFS: Failed to create %s!\n", + ntfs_index_ctx_cache_name); + goto ictx_err_out; + } + ntfs_attr_ctx_cache = kmem_cache_create(ntfs_attr_ctx_cache_name, + sizeof(ntfs_attr_search_ctx), 0 /* offset */, + SLAB_HWCACHE_ALIGN, NULL /* ctor */, NULL /* dtor */); + if (!ntfs_attr_ctx_cache) { + printk(KERN_CRIT "NTFS: Failed to create %s!\n", + ntfs_attr_ctx_cache_name); + goto actx_err_out; + } + + ntfs_name_cache = kmem_cache_create(ntfs_name_cache_name, + (NTFS_MAX_NAME_LEN+1) * sizeof(ntfschar), 0, + SLAB_HWCACHE_ALIGN, NULL, NULL); + if (!ntfs_name_cache) { + printk(KERN_CRIT "NTFS: Failed to create %s!\n", + ntfs_name_cache_name); + goto name_err_out; + } + + ntfs_inode_cache = kmem_cache_create(ntfs_inode_cache_name, + sizeof(ntfs_inode), 0, + SLAB_RECLAIM_ACCOUNT, NULL, NULL); + if (!ntfs_inode_cache) { + printk(KERN_CRIT "NTFS: Failed to create %s!\n", + ntfs_inode_cache_name); + goto inode_err_out; + } + + ntfs_big_inode_cache = kmem_cache_create(ntfs_big_inode_cache_name, + sizeof(big_ntfs_inode), 0, + SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT, + ntfs_big_inode_init_once, NULL); + if (!ntfs_big_inode_cache) { + printk(KERN_CRIT "NTFS: Failed to create %s!\n", + ntfs_big_inode_cache_name); + goto big_inode_err_out; + } + + /* Register the ntfs sysctls. */ + err = ntfs_sysctl(1); + if (err) { + printk(KERN_CRIT "NTFS: Failed to register NTFS sysctls!\n"); + goto sysctl_err_out; + } + + err = register_filesystem(&ntfs_fs_type); + if (!err) { + ntfs_debug("NTFS driver registered successfully."); + return 0; /* Success! */ + } + printk(KERN_CRIT "NTFS: Failed to register NTFS file system driver!\n"); + +sysctl_err_out: + kmem_cache_destroy(ntfs_big_inode_cache); +big_inode_err_out: + kmem_cache_destroy(ntfs_inode_cache); +inode_err_out: + kmem_cache_destroy(ntfs_name_cache); +name_err_out: + kmem_cache_destroy(ntfs_attr_ctx_cache); +actx_err_out: + kmem_cache_destroy(ntfs_index_ctx_cache); +ictx_err_out: + if (!err) { + printk(KERN_CRIT "NTFS: Aborting NTFS file system driver " + "registration...\n"); + err = -ENOMEM; + } + return err; +} + +static void __exit exit_ntfs_fs(void) +{ + int err = 0; + + ntfs_debug("Unregistering NTFS driver."); + + unregister_filesystem(&ntfs_fs_type); + + if (kmem_cache_destroy(ntfs_big_inode_cache) && (err = 1)) + printk(KERN_CRIT "NTFS: Failed to destory %s.\n", + ntfs_big_inode_cache_name); + if (kmem_cache_destroy(ntfs_inode_cache) && (err = 1)) + printk(KERN_CRIT "NTFS: Failed to destory %s.\n", + ntfs_inode_cache_name); + if (kmem_cache_destroy(ntfs_name_cache) && (err = 1)) + printk(KERN_CRIT "NTFS: Failed to destory %s.\n", + ntfs_name_cache_name); + if (kmem_cache_destroy(ntfs_attr_ctx_cache) && (err = 1)) + printk(KERN_CRIT "NTFS: Failed to destory %s.\n", + ntfs_attr_ctx_cache_name); + if (kmem_cache_destroy(ntfs_index_ctx_cache) && (err = 1)) + printk(KERN_CRIT "NTFS: Failed to destory %s.\n", + ntfs_index_ctx_cache_name); + if (err) + printk(KERN_CRIT "NTFS: This causes memory to leak! There is " + "probably a BUG in the driver! Please report " + "you saw this message to " + "linux-ntfs-dev@lists.sourceforge.net\n"); + /* Unregister the ntfs sysctls. */ + ntfs_sysctl(0); +} + +MODULE_AUTHOR("Anton Altaparmakov <aia21@cantab.net>"); +MODULE_DESCRIPTION("NTFS 1.2/3.x driver - Copyright (c) 2001-2004 Anton Altaparmakov"); +MODULE_VERSION(NTFS_VERSION); +MODULE_LICENSE("GPL"); +#ifdef DEBUG +module_param(debug_msgs, bool, 0); +MODULE_PARM_DESC(debug_msgs, "Enable debug messages."); +#endif + +module_init(init_ntfs_fs) +module_exit(exit_ntfs_fs) |
