diff options
Diffstat (limited to 'fs/ntfs/super.c')
| -rw-r--r-- | fs/ntfs/super.c | 3202 |
1 files changed, 0 insertions, 3202 deletions
diff --git a/fs/ntfs/super.c b/fs/ntfs/super.c deleted file mode 100644 index 56a7d5bd33e4..000000000000 --- a/fs/ntfs/super.c +++ /dev/null @@ -1,3202 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * super.c - NTFS kernel super block handling. Part of the Linux-NTFS project. - * - * Copyright (c) 2001-2012 Anton Altaparmakov and Tuxera Inc. - * Copyright (c) 2001,2002 Richard Russon - */ -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt - -#include <linux/stddef.h> -#include <linux/init.h> -#include <linux/slab.h> -#include <linux/string.h> -#include <linux/spinlock.h> -#include <linux/blkdev.h> /* For bdev_logical_block_size(). */ -#include <linux/backing-dev.h> -#include <linux/buffer_head.h> -#include <linux/vfs.h> -#include <linux/moduleparam.h> -#include <linux/bitmap.h> - -#include "sysctl.h" -#include "logfile.h" -#include "quota.h" -#include "usnjrnl.h" -#include "dir.h" -#include "debug.h" -#include "index.h" -#include "inode.h" -#include "aops.h" -#include "layout.h" -#include "malloc.h" -#include "ntfs.h" - -/* Number of mounted filesystems 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; -static unsigned long ntfs_nr_upcase_users; - -/* 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 - convert input string to a boolean value - * @s: input string to convert - * @setval: where to store the output boolean value - * - * Copied from old ntfs driver (which copied from vfat driver). - * - * "1", "yes", "true", or an empty string are converted to %true. - * "0", "no", and "false" are converted to %false. - * - * Return: %1 if the string is converted or was empty and *setval contains it; - * %0 if the string was not valid. - */ -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; - kuid_t uid = INVALID_UID; - kgid_t gid = INVALID_GID; - umode_t fmask = (umode_t)-1, dmask = (umode_t)-1; - int mft_zone_multiplier = -1, on_errors = -1; - int show_sys_files = -1, case_sensitive = -1, disable_sparse = -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_UID(option, variable) \ - if (!strcmp(p, option)) { \ - uid_t uid_value; \ - if (!v || !*v) \ - goto needs_arg; \ - uid_value = simple_strtoul(ov = v, &v, 0); \ - if (*v) \ - goto needs_val; \ - variable = make_kuid(current_user_ns(), uid_value); \ - if (!uid_valid(variable)) \ - goto needs_val; \ - } -#define NTFS_GETOPT_GID(option, variable) \ - if (!strcmp(p, option)) { \ - gid_t gid_value; \ - if (!v || !*v) \ - goto needs_arg; \ - gid_value = simple_strtoul(ov = v, &v, 0); \ - if (*v) \ - goto needs_val; \ - variable = make_kgid(current_user_ns(), gid_value); \ - if (!gid_valid(variable)) \ - goto needs_val; \ - } -#define NTFS_GETOPT_OCTAL(option, variable) \ - if (!strcmp(p, option)) { \ - if (!v || !*v) \ - goto needs_arg; \ - variable = simple_strtoul(ov = v, &v, 8); \ - 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", uid) - else NTFS_GETOPT_GID("gid", gid) - else NTFS_GETOPT_OCTAL("umask", fmask = dmask) - else NTFS_GETOPT_OCTAL("fmask", fmask) - else NTFS_GETOPT_OCTAL("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_BOOL("disable_sparse", disable_sparse) - 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 */ { - 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_valid(uid)) - vol->uid = uid; - if (gid_valid(gid)) - vol->gid = gid; - if (fmask != (umode_t)-1) - vol->fmask = fmask; - if (dmask != (umode_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); - } - if (disable_sparse != -1) { - if (disable_sparse) - NVolClearSparseEnabled(vol); - else { - if (!NVolSparseEnabled(vol) && - vol->major_ver && vol->major_ver < 3) - ntfs_warning(vol->sb, "Not enabling sparse " - "support due to NTFS volume " - "version %i.%i (need at least " - "version 3.0).", vol->major_ver, - vol->minor_ver); - else - NVolSetSparseEnabled(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); - - sync_filesystem(sb); - -#ifndef NTFS_RW - /* For read-only compiled driver, enforce read-only flag. */ - *flags |= SB_RDONLY; -#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 occurred. - */ - if (sb_rdonly(sb) && !(*flags & SB_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_MODIFIED_BY_CHKDSK) { - ntfs_error(sb, "Volume has been modified by chkdsk " - "and is read-only%s", es); - return -EROFS; - } - if (vol->vol_flags & VOLUME_MUST_MOUNT_RO_MASK) { - ntfs_error(sb, "Volume has unsupported flags set " - "(0x%x) and is read-only%s", - (unsigned)le16_to_cpu(vol->vol_flags), - 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 $LogFile%s", - es); - NVolSetErrors(vol); - return -EROFS; - } - if (!ntfs_mark_quotas_out_of_date(vol)) { - ntfs_error(sb, "Failed to mark quotas out of date%s", - es); - NVolSetErrors(vol); - return -EROFS; - } - if (!ntfs_stamp_usnjrnl(vol)) { - ntfs_error(sb, "Failed to stamp transaction log " - "($UsnJrnl)%s", es); - NVolSetErrors(vol); - return -EROFS; - } - } else if (!sb_rdonly(sb) && (*flags & SB_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. We will work when - * the checksum test fails, since some utilities update the boot sector - * ignoring the checksum which leaves the checksum out-of-date. We - * report a warning if this is the case. - */ - if ((void*)b < (void*)&b->checksum && b->checksum && !silent) { - 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) - ntfs_warning(sb, "Invalid boot sector checksum."); - } - /* 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 the maximum (64kiB). */ - if ((u32)le16_to_cpu(b->bpb.bytes_per_sector) * - b->bpb.sectors_per_cluster > NTFS_MAX_CLUSTER_SIZE) - 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; - sector_t 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. Note we only copy the actual boot - * sector structure, not the actual whole device sector as that - * may be bigger and would potentially damage the $Boot system - * file (FIXME: Would be nice to know if the backup boot sector - * on a large sector device contains the whole boot loader or - * just the first 512 bytes). - */ - if (!sb_rdonly(sb)) { - ntfs_warning(sb, "Hot-fix: Recovering invalid primary " - "boot sector from backup copy."); - memcpy(bh_primary->b_data, bh_backup->b_data, - NTFS_BLOCK_SIZE); - 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_error(vol->sb, "Sector size (%i) is smaller than the " - "device block size (%lu). This is not " - "supported. Sorry.", vol->sector_size, - vol->sb->s_blocksize); - return false; - } - 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", vol->cluster_size_bits); - if (vol->cluster_size < vol->sector_size) { - ntfs_error(vol->sb, "Cluster size (%i) is smaller than the " - "sector size (%i). This is not supported. " - "Sorry.", vol->cluster_size, vol->sector_size); - 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_SIZE since - * we store $MFT/$DATA, the table of mft records in the page cache. - */ - if (vol->mft_record_size > PAGE_SIZE) { - ntfs_error(vol->sb, "Mft record size (%i) exceeds the " - "PAGE_SIZE on your system (%lu). " - "This is not supported. Sorry.", - vol->mft_record_size, PAGE_SIZE); - return false; - } - /* We cannot support mft record sizes below the sector size. */ - if (vol->mft_record_size < vol->sector_size) { - ntfs_error(vol->sb, "Mft record size (%i) is smaller than the " - "sector size (%i). This is not supported. " - "Sorry.", vol->mft_record_size, - vol->sector_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); - /* We cannot support index record sizes below the sector size. */ - if (vol->index_record_size < vol->sector_size) { - ntfs_error(vol->sb, "Index record size (%i) is smaller than " - "the sector size (%i). This is not " - "supported. Sorry.", vol->index_record_size, - vol->sector_size); - return false; - } - /* - * 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 (%lli, 0x%llx) is beyond end of " - "volume. Weird.", (unsigned long long)ll, - (unsigned long long)ll); - 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 (%lli, 0x%llx) is beyond end " - "of volume. Weird.", (unsigned long long)ll, - (unsigned long long)ll); - 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 = GLOBAL_ROOT_UID; - tmp_ino->i_gid = GLOBAL_ROOT_GID; - /* 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); - NInoSetSparseDisabled(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) -{ - struct super_block *sb = vol->sb; - ntfs_inode *mirr_ni; - struct page *mft_page, *mirr_page; - u8 *kmft, *kmirr; - runlist_element *rl, rl2[2]; - pgoff_t index; - int mrecs_per_page, i; - - ntfs_debug("Entering."); - /* Compare contents of $MFT and $MFTMirr. */ - mrecs_per_page = PAGE_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 $MFTMirr."); - goto mft_unmap_out; - } - kmirr = page_address(mirr_page); - ++index; - } - /* Do not check the record if it is not in use. */ - if (((MFT_RECORD*)kmft)->flags & MFT_RECORD_IN_USE) { - /* Make sure the record is ok. */ - if (ntfs_is_baad_recordp((le32*)kmft)) { - ntfs_error(sb, "Incomplete multi sector " - "transfer detected in mft " - "record %i.", i); -mm_unmap_out: - ntfs_unmap_page(mirr_page); -mft_unmap_out: - ntfs_unmap_page(mft_page); - return false; - } - } - /* Do not check the mirror record if it is not in use. */ - if (((MFT_RECORD*)kmirr)->flags & MFT_RECORD_IN_USE) { - if (ntfs_is_baad_recordp((le32*)kmirr)) { - ntfs_error(sb, "Incomplete multi sector " - "transfer detected in mft " - "mirror record %i.", i); - goto mm_unmap_out; - } - } - /* Get the amount of data in the current record. */ - bytes = le32_to_cpu(((MFT_RECORD*)kmft)->bytes_in_use); - if (bytes < sizeof(MFT_RECORD_OLD) || - bytes > vol->mft_record_size || - ntfs_is_baad_recordp((le32*)kmft)) { - bytes = le32_to_cpu(((MFT_RECORD*)kmirr)->bytes_in_use); - if (bytes < sizeof(MFT_RECORD_OLD) || - bytes > vol->mft_record_size || - ntfs_is_baad_recordp((le32*)kmirr)) - bytes = vol->mft_record_size; - } - /* Compare the two records. */ - if (memcmp(kmft, kmirr, bytes)) { - ntfs_error(sb, "$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, - RESTART_PAGE_HEADER **rp) -{ - 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, rp)) { - iput(tmp_ino); - /* ntfs_check_logfile() will have displayed error output. */ - return false; - } - NInoSetSparseDisabled(NTFS_I(tmp_ino)); - vol->logfile_ino = tmp_ino; - ntfs_debug("Done."); - return true; -} - -#define NTFS_HIBERFIL_HEADER_SIZE 4096 - -/** - * check_windows_hibernation_status - check if Windows is suspended on a volume - * @vol: ntfs super block of device to check - * - * Check if Windows is hibernated on the ntfs volume @vol. This is done by - * looking for the file hiberfil.sys in the root directory of the volume. If - * the file is not present Windows is definitely not suspended. - * - * If hiberfil.sys exists and is less than 4kiB in size it means Windows is - * definitely suspended (this volume is not the system volume). Caveat: on a - * system with many volumes it is possible that the < 4kiB check is bogus but - * for now this should do fine. - * - * If hiberfil.sys exists and is larger than 4kiB in size, we need to read the - * hiberfil header (which is the first 4kiB). If this begins with "hibr", - * Windows is definitely suspended. If it is completely full of zeroes, - * Windows is definitely not hibernated. Any other case is treated as if - * Windows is suspended. This caters for the above mentioned caveat of a - * system with many volumes where no "hibr" magic would be present and there is - * no zero header. - * - * Return 0 if Windows is not hibernated on the volume, >0 if Windows is - * hibernated on the volume, and -errno on error. - */ -static int check_windows_hibernation_status(ntfs_volume *vol) -{ - MFT_REF mref; - struct inode *vi; - struct page *page; - u32 *kaddr, *kend; - ntfs_name *name = NULL; - int ret = 1; - static const ntfschar hiberfil[13] = { cpu_to_le16('h'), - cpu_to_le16('i'), cpu_to_le16('b'), - cpu_to_le16('e'), cpu_to_le16('r'), - cpu_to_le16('f'), cpu_to_le16('i'), - cpu_to_le16('l'), cpu_to_le16('.'), - cpu_to_le16('s'), cpu_to_le16('y'), - cpu_to_le16('s'), 0 }; - - ntfs_debug("Entering."); - /* - * Find the inode number for the hibernation file by looking up the - * filename hiberfil.sys in the root directory. - */ - inode_lock(vol->root_ino); - mref = ntfs_lookup_inode_by_name(NTFS_I(vol->root_ino), hiberfil, 12, - &name); - inode_unlock(vol->root_ino); - if (IS_ERR_MREF(mref)) { - ret = MREF_ERR(mref); - /* If the file does not exist, Windows is not hibernated. */ - if (ret == -ENOENT) { - ntfs_debug("hiberfil.sys not present. Windows is not " - "hibernated on the volume."); - return 0; - } - /* A real error occurred. */ - ntfs_error(vol->sb, "Failed to find inode number for " - "hiberfil.sys."); - return ret; - } - /* We do not care for the type of match that was found. */ - kfree(name); - /* Get the inode. */ - vi = ntfs_iget(vol->sb, MREF(mref)); - if (IS_ERR(vi) || is_bad_inode(vi)) { - if (!IS_ERR(vi)) - iput(vi); - ntfs_error(vol->sb, "Failed to load hiberfil.sys."); - return IS_ERR(vi) ? PTR_ERR(vi) : -EIO; - } - if (unlikely(i_size_read(vi) < NTFS_HIBERFIL_HEADER_SIZE)) { - ntfs_debug("hiberfil.sys is smaller than 4kiB (0x%llx). " - "Windows is hibernated on the volume. This " - "is not the system volume.", i_size_read(vi)); - goto iput_out; - } - page = ntfs_map_page(vi->i_mapping, 0); - if (IS_ERR(page)) { - ntfs_error(vol->sb, "Failed to read from hiberfil.sys."); - ret = PTR_ERR(page); - goto iput_out; - } - kaddr = (u32*)page_address(page); - if (*(le32*)kaddr == cpu_to_le32(0x72626968)/*'hibr'*/) { - ntfs_debug("Magic \"hibr\" found in hiberfil.sys. Windows is " - "hibernated on the volume. This is the " - "system volume."); - goto unm_iput_out; - } - kend = kaddr + NTFS_HIBERFIL_HEADER_SIZE/sizeof(*kaddr); - do { - if (unlikely(*kaddr)) { - ntfs_debug("hiberfil.sys is larger than 4kiB " - "(0x%llx), does not contain the " - "\"hibr\" magic, and does not have a " - "zero header. Windows is hibernated " - "on the volume. This is not the " - "system volume.", i_size_read(vi)); - goto unm_iput_out; - } - } while (++kaddr < kend); - ntfs_debug("hiberfil.sys contains a zero header. Windows is not " - "hibernated on the volume. This is the system " - "volume."); - ret = 0; -unm_iput_out: - ntfs_unmap_page(page); -iput_out: - iput(vi); - return ret; -} - -/** - * 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 $Quota is not present, we - * leave vol->quota_ino as NULL and return success. - */ -static bool load_and_init_quota(ntfs_volume *vol) -{ - MFT_REF mref; - struct inode *tmp_ino; - ntfs_name *name = NULL; - static const ntfschar Quota[7] = { cpu_to_le16('$'), - cpu_to_le16('Q'), cpu_to_le16('u'), - cpu_to_le16('o'), cpu_to_le16('t'), - cpu_to_le16('a'), 0 }; - static ntfschar Q[3] = { cpu_to_le16('$'), - 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 $Extend. - */ - inode_lock(vol->extend_ino); - mref = ntfs_lookup_inode_by_name(NTFS_I(vol->extend_ino), Quota, 6, - &name); - inode_unlock(vol->extend_ino); - if (IS_ERR_MREF(mref)) { - /* - * If the file does not exist, quotas are disabled and have - * never been enabled on this volume, just return success. - */ - if (MREF_ERR(mref) == -ENOENT) { - ntfs_debug("$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 occurred. */ - 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. */ - 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_usnjrnl - load and setup the transaction log if present - * @vol: ntfs super block describing device whose usnjrnl file to load - * - * Return 'true' on success or 'false' on error. - * - * If $UsnJrnl is not present or in the process of being disabled, we set - * NVolUsnJrnlStamped() and return success. - * - * If the $UsnJrnl $DATA/$J attribute has a size equal to the lowest valid usn, - * i.e. transaction logging has only just been enabled or the journal has been - * stamped and nothing has been logged since, we also set NVolUsnJrnlStamped() - * and return success. - */ -static bool load_and_init_usnjrnl(ntfs_volume *vol) -{ - MFT_REF mref; - struct inode *tmp_ino; - ntfs_inode *tmp_ni; - struct page *page; - ntfs_name *name = NULL; - USN_HEADER *uh; - static const ntfschar UsnJrnl[9] = { cpu_to_le16('$'), - cpu_to_le16('U'), cpu_to_le16('s'), - cpu_to_le16('n'), cpu_to_le16('J'), - cpu_to_le16('r'), cpu_to_le16('n'), - cpu_to_le16('l'), 0 }; - static ntfschar Max[5] = { cpu_to_le16('$'), - cpu_to_le16('M'), cpu_to_le16('a'), - cpu_to_le16('x'), 0 }; - static ntfschar J[3] = { cpu_to_le16('$'), - cpu_to_le16('J'), 0 }; - - ntfs_debug("Entering."); - /* - * Find the inode number for the transaction log file by looking up the - * filename $UsnJrnl in the extended system files directory $Extend. - */ - inode_lock(vol->extend_ino); - mref = ntfs_lookup_inode_by_name(NTFS_I(vol->extend_ino), UsnJrnl, 8, - &name); - inode_unlock(vol->extend_ino); - if (IS_ERR_MREF(mref)) { - /* - * If the file does not exist, transaction logging is disabled, - * just return success. - */ - if (MREF_ERR(mref) == -ENOENT) { - ntfs_debug("$UsnJrnl not present. Volume does not " - "have transaction logging enabled."); -not_enabled: - /* - * No need to try to stamp the transaction log if - * transaction logging is not enabled. - */ - NVolSetUsnJrnlStamped(vol); - return true; - } - /* A real error occurred. */ - ntfs_error(vol->sb, "Failed to find inode number for " - "$UsnJrnl."); - return false; - } - /* We do not care for the type of match that was found. */ - kfree(name); - /* Get the inode. */ - tmp_ino = ntfs_iget(vol->sb, MREF(mref)); - if (IS_ERR(tmp_ino) || unlikely(is_bad_inode(tmp_ino))) { - if (!IS_ERR(tmp_ino)) - iput(tmp_ino); - ntfs_error(vol->sb, "Failed to load $UsnJrnl."); - return false; - } - vol->usnjrnl_ino = tmp_ino; - /* - * If the transaction log is in the process of being deleted, we can - * ignore it. - */ - if (unlikely(vol->vol_flags & VOLUME_DELETE_USN_UNDERWAY)) { - ntfs_debug("$UsnJrnl in the process of being disabled. " - "Volume does not have transaction logging " - "enabled."); - goto not_enabled; - } - /* Get the $DATA/$Max attribute. */ - tmp_ino = ntfs_attr_iget(vol->usnjrnl_ino, AT_DATA, Max, 4); - if (IS_ERR(tmp_ino)) { - ntfs_error(vol->sb, "Failed to load $UsnJrnl/$DATA/$Max " - "attribute."); - return false; - } - vol->usnjrnl_max_ino = tmp_ino; - if (unlikely(i_size_read(tmp_ino) < sizeof(USN_HEADER))) { - ntfs_error(vol->sb, "Found corrupt $UsnJrnl/$DATA/$Max " - "attribute (size is 0x%llx but should be at " - "least 0x%zx bytes).", i_size_read(tmp_ino), - sizeof(USN_HEADER)); - return false; - } - /* Get the $DATA/$J attribute. */ - tmp_ino = ntfs_attr_iget(vol->usnjrnl_ino, AT_DATA, J, 2); - if (IS_ERR(tmp_ino)) { - ntfs_error(vol->sb, "Failed to load $UsnJrnl/$DATA/$J " - "attribute."); - return false; - } - vol->usnjrnl_j_ino = tmp_ino; - /* Verify $J is non-resident and sparse. */ - tmp_ni = NTFS_I(vol->usnjrnl_j_ino); - if (unlikely(!NInoNonResident(tmp_ni) || !NInoSparse(tmp_ni))) { - ntfs_error(vol->sb, "$UsnJrnl/$DATA/$J attribute is resident " - "and/or not sparse."); - return false; - } - /* Read the USN_HEADER from $DATA/$Max. */ - page = ntfs_map_page(vol->usnjrnl_max_ino->i_mapping, 0); - if (IS_ERR(page)) { - ntfs_error(vol->sb, "Failed to read from $UsnJrnl/$DATA/$Max " - "attribute."); - return false; - } - uh = (USN_HEADER*)page_address(page); - /* Sanity check the $Max. */ - if (unlikely(sle64_to_cpu(uh->allocation_delta) > - sle64_to_cpu(uh->maximum_size))) { - ntfs_error(vol->sb, "Allocation delta (0x%llx) exceeds " - "maximum size (0x%llx). $UsnJrnl is corrupt.", - (long long)sle64_to_cpu(uh->allocation_delta), - (long long)sle64_to_cpu(uh->maximum_size)); - ntfs_unmap_page(page); - return false; - } - /* - * If the transaction log has been stamped and nothing has been written - * to it since, we do not need to stamp it. - */ - if (unlikely(sle64_to_cpu(uh->lowest_valid_usn) >= - i_size_read(vol->usnjrnl_j_ino))) { - if (likely(sle64_to_cpu(uh->lowest_valid_usn) == - i_size_read(vol->usnjrnl_j_ino))) { - ntfs_unmap_page(page); - ntfs_debug("$UsnJrnl is enabled but nothing has been " - "logged since it was last stamped. " - "Treating this as if the volume does " - "not have transaction logging " - "enabled."); - goto not_enabled; - } - ntfs_error(vol->sb, "$UsnJrnl has lowest valid usn (0x%llx) " - "which is out of bounds (0x%llx). $UsnJrnl " - "is corrupt.", - (long long)sle64_to_cpu(uh->lowest_valid_usn), - i_size_read(vol->usnjrnl_j_ino)); - ntfs_unmap_page(page); - return false; - } - ntfs_unmap_page(page); - 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) -{ - loff_t i_size; - struct super_block *sb = vol->sb; - struct inode *ino; - struct page *page; - pgoff_t 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; - } - NInoSetSparseDisabled(NTFS_I(ino)); - /* The size of FILE_AttrDef must be above 0 and fit inside 31 bits. */ - i_size = i_size_read(ino); - if (i_size <= 0 || i_size > 0x7fffffff) - goto iput_failed; - vol->attrdef = (ATTR_DEF*)ntfs_malloc_nofs(i_size); - if (!vol->attrdef) - goto iput_failed; - index = 0; - max_index = i_size >> PAGE_SHIFT; - size = PAGE_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_SHIFT), - page_address(page), size); - ntfs_unmap_page(page); - } - if (size == PAGE_SIZE) { - size = i_size & ~PAGE_MASK; - if (size) - goto read_partial_attrdef_page; - } - vol->attrdef_size = i_size; - ntfs_debug("Read %llu bytes from $AttrDef.", 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) -{ - loff_t i_size; - struct super_block *sb = vol->sb; - struct inode *ino; - struct page *page; - pgoff_t 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). - */ - i_size = i_size_read(ino); - if (!i_size || i_size & (sizeof(ntfschar) - 1) || - i_size > 64ULL * 1024 * sizeof(ntfschar)) - goto iput_upcase_failed; - vol->upcase = (ntfschar*)ntfs_malloc_nofs(i_size); - if (!vol->upcase) - goto iput_upcase_failed; - index = 0; - max_index = i_size >> PAGE_SHIFT; - size = PAGE_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_SHIFT), - page_address(page), size); - ntfs_unmap_page(page); - } - if (size == PAGE_SIZE) { - size = i_size & ~PAGE_MASK; - if (size) - goto read_partial_upcase_page; - } - vol->upcase_len = i_size >> UCHAR_T_SIZE_BITS; - ntfs_debug("Read %llu bytes from $UpCase (expected %zu bytes).", - i_size, 64 * 1024 * sizeof(ntfschar)); - iput(ino); - mutex_lock(&ntfs_lock); - if (!default_upcase) { - ntfs_debug("Using volume specified $UpCase since default is " - "not present."); - mutex_unlock(&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++; - mutex_unlock(&ntfs_lock); - ntfs_debug("Volume specified $UpCase matches default. Using " - "default."); - return true; - } - mutex_unlock(&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: - mutex_lock(&ntfs_lock); - if (default_upcase) { - vol->upcase = default_upcase; - vol->upcase_len = default_upcase_len; - ntfs_nr_upcase_users++; - mutex_unlock(&ntfs_lock); - ntfs_error(sb, "Failed to load $UpCase from the volume. Using " - "default."); - return true; - } - mutex_unlock(&ntfs_lock); - ntfs_error(sb, "Failed to initialize upcase table."); - return false; -} - -/* - * The lcn and mft bitmap inodes are NTFS-internal inodes with - * their own special locking rules: - */ -static struct lock_class_key - lcnbmp_runlist_lock_key, lcnbmp_mrec_lock_key, - mftbmp_runlist_lock_key, mftbmp_mrec_lock_key; - -/** - * 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; -#ifdef NTFS_RW - RESTART_PAGE_HEADER *rp; - int err; -#endif /* NTFS_RW */ - - 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_rdonly(sb)) { - 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 |= SB_RDONLY; - 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; - } - lockdep_set_class(&NTFS_I(vol->mftbmp_ino)->runlist.lock, - &mftbmp_runlist_lock_key); - lockdep_set_class(&NTFS_I(vol->mftbmp_ino)->mrec_lock, - &mftbmp_mrec_lock_key); - /* 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; - } - lockdep_set_class(&NTFS_I(vol->lcnbmp_ino)->runlist.lock, - &lcnbmp_runlist_lock_key); - lockdep_set_class(&NTFS_I(vol->lcnbmp_ino)->mrec_lock, - &lcnbmp_mrec_lock_key); - - NInoSetSparseDisabled(NTFS_I(vol->lcnbmp_ino)); - if ((vol->nr_clusters + 7) >> 3 > i_size_read(vol->lcnbmp_ino)) { - 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)); - pr_info("volume version %i.%i.\n", vol->major_ver, - vol->minor_ver); - if (vol->major_ver < 3 && NVolSparseEnabled(vol)) { - ntfs_warning(vol->sb, "Disabling sparse support due to NTFS " - "volume version %i.%i (need at least version " - "3.0).", vol->major_ver, vol->minor_ver); - NVolClearSparseEnabled(vol); - } -#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 been modified by chkdsk"; - static const char *es1c = "Volume has unsupported flags set"; - static const char *es2a = ". Run chkdsk and mount in Windows."; - static const char *es2b = ". Mount in Windows."; - const char *es1, *es2; - - es2 = es2a; - if (vol->vol_flags & VOLUME_IS_DIRTY) - es1 = es1a; - else if (vol->vol_flags & VOLUME_MODIFIED_BY_CHKDSK) { - es1 = es1b; - es2 = es2b; - } else { - es1 = es1c; - ntfs_warning(sb, "Unsupported volume flags 0x%x " - "encountered.", - (unsigned)le16_to_cpu(vol->vol_flags)); - } - /* If a read-write mount, convert it to a read-only mount. */ - if (!sb_rdonly(sb)) { - 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 |= SB_RDONLY; - 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. - */ - rp = NULL; - if (!load_and_check_logfile(vol, &rp) || - !ntfs_is_logfile_clean(vol->logfile_ino, rp)) { - 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_rdonly(sb)) { - 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); - if (vol->logfile_ino) { - BUG_ON(!rp); - ntfs_free(rp); - } - goto iput_logfile_err_out; - } - sb->s_flags |= SB_RDONLY; - 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); - } - ntfs_free(rp); -#endif /* NTFS_RW */ - /* Get the root directory inode so we can do path lookups. */ - 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; - } -#ifdef NTFS_RW - /* - * Check if Windows is suspended to disk on the target volume. If it - * is hibernated, we must not write *anything* to the disk so set - * NVolErrors() without setting the dirty volume flag and mount - * read-only. This will prevent read-write remounting and it will also - * prevent all writes. - */ - err = check_windows_hibernation_status(vol); - if (unlikely(err)) { - static const char *es1a = "Failed to determine if Windows is " - "hibernated"; - static const char *es1b = "Windows is hibernated"; - static const char *es2 = ". Run chkdsk."; - const char *es1; - - es1 = err < 0 ? es1a : es1b; - /* If a read-write mount, convert it to a read-only mount. */ - if (!sb_rdonly(sb)) { - 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_root_err_out; - } - sb->s_flags |= SB_RDONLY; - 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_rdonly(sb) && 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_root_err_out; - } - ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); - sb->s_flags |= SB_RDONLY; - /* - * 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 & SB_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_root_err_out; - } - ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); - sb->s_flags |= SB_RDONLY; - NVolSetErrors(vol); - } -#endif - /* If (still) a read-write mount, empty the logfile. */ - if (!sb_rdonly(sb) && !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_root_err_out; - } - ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); - sb->s_flags |= SB_RDONLY; - NVolSetErrors(vol); - } -#endif /* NTFS_RW */ - /* If on NTFS versions before 3.0, we are done. */ - if (unlikely(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; - } - // TODO: 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) || - !S_ISDIR(vol->extend_ino->i_mode)) { - 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 $Quota"; - static const char *es2 = ". Run chkdsk."; - - /* If a read-write mount, convert it to a read-only mount. */ - if (!sb_rdonly(sb)) { - if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | - ON_ERRORS_CONTINUE))) { - ntfs_error(sb, "%s and neither on_errors=" - "continue nor on_errors=" - "remount-ro was specified%s", - es1, es2); - goto iput_quota_err_out; - } - sb->s_flags |= SB_RDONLY; - ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); - } else - ntfs_warning(sb, "%s. Will not be able to remount " - "read-write%s", es1, es2); - /* This will prevent a read-write remount. */ - NVolSetErrors(vol); - } - /* If (still) a read-write mount, mark the quotas out of date. */ - if (!sb_rdonly(sb) && !ntfs_mark_quotas_out_of_date(vol)) { - static const char *es1 = "Failed to mark quotas out of date"; - static const char *es2 = ". Run chkdsk."; - - /* Convert to a read-only mount. */ - if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | - ON_ERRORS_CONTINUE))) { - ntfs_error(sb, "%s and neither on_errors=continue nor " - "on_errors=remount-ro was specified%s", - es1, es2); - goto iput_quota_err_out; - } - ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); - sb->s_flags |= SB_RDONLY; - NVolSetErrors(vol); - } - /* - * Find the transaction log file ($UsnJrnl), load it if present, check - * it, and set it up. - */ - if (!load_and_init_usnjrnl(vol)) { - static const char *es1 = "Failed to load $UsnJrnl"; - static const char *es2 = ". Run chkdsk."; - - /* If a read-write mount, convert it to a read-only mount. */ - if (!sb_rdonly(sb)) { - if (!(vol->on_errors & (ON_ERRORS_REMOUNT_RO | - ON_ERRORS_CONTINUE))) { - ntfs_error(sb, "%s and neither on_errors=" - "continue nor on_errors=" - "remount-ro was specified%s", - es1, es2); - goto iput_usnjrnl_err_out; - } - sb->s_flags |= SB_RDONLY; - ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); - } else - ntfs_warning(sb, "%s. Will not be able to remount " - "read-write%s", es1, es2); - /* This will prevent a read-write remount. */ - NVolSetErrors(vol); - } - /* If (still) a read-write mount, stamp the transaction log. */ - if (!sb_rdonly(sb) && !ntfs_stamp_usnjrnl(vol)) { - static const char *es1 = "Failed to stamp transaction log " - "($UsnJrnl)"; - 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_usnjrnl_err_out; - } - ntfs_error(sb, "%s. Mounting read-only%s", es1, es2); - sb->s_flags |= SB_RDONLY; - NVolSetErrors(vol); - } -#endif /* NTFS_RW */ - return true; -#ifdef NTFS_RW -iput_usnjrnl_err_out: - iput(vol->usnjrnl_j_ino); - iput(vol->usnjrnl_max_ino); - iput(vol->usnjrnl_ino); -iput_quota_err_out: - iput(vol->quota_q_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 - 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; - mutex_lock(&ntfs_lock); - if (vol->upcase == default_upcase) { - ntfs_nr_upcase_users--; - vol->upcase = NULL; - } - mutex_unlock(&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 - 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->usnjrnl_j_ino) - ntfs_commit_inode(vol->usnjrnl_j_ino); - if (vol->usnjrnl_max_ino) - ntfs_commit_inode(vol->usnjrnl_max_ino); - if (vol->usnjrnl_ino) - ntfs_commit_inode(vol->usnjrnl_ino); - 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 occurred, mark the - * volume clean. Also, re-commit all affected inodes. - */ - if (!sb_rdonly(sb)) { - 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->usnjrnl_j_ino) { - iput(vol->usnjrnl_j_ino); - vol->usnjrnl_j_ino = NULL; - } - if (vol->usnjrnl_max_ino) { - iput(vol->usnjrnl_max_ino); - vol->usnjrnl_max_ino = NULL; - } - if (vol->usnjrnl_ino) { - iput(vol->usnjrnl_ino); - vol->usnjrnl_ino = NULL; - } - 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; - } - /* - * We should have no dirty inodes left, due to - * mft.c::ntfs_mft_writepage() cleaning all the dirty pages as - * the underlying mft records are written out and cleaned. - */ - ntfs_commit_inode(vol->mft_ino); - write_inode_now(vol->mft_ino, 1); -#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. - */ - mutex_lock(&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(); - mutex_unlock(&ntfs_lock); - if (vol->upcase) { - ntfs_free(vol->upcase); - vol->upcase = NULL; - } - - unload_nls(vol->nls_map); - - sb->s_fs_info = NULL; - kfree(vol); -} - -/** - * 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; - struct address_space *mapping = vol->lcnbmp_ino->i_mapping; - struct page *page; - pgoff_t index, max_index; - - 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_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_SIZE - 1) >> - PAGE_SHIFT; - /* Use multiples of 4 bytes, thus max_size is PAGE_SIZE / 4. */ - ntfs_debug("Reading $Bitmap, max_index = 0x%lx, max_size = 0x%lx.", - max_index, PAGE_SIZE / 4); - for (index = 0; index < max_index; index++) { - unsigned long *kaddr; - - /* - * Read the page from page cache, getting it from backing store - * if necessary, and increment the use count. - */ - page = read_mapping_page(mapping, index, NULL); - /* Ignore pages which errored synchronously. */ - if (IS_ERR(page)) { - ntfs_debug("read_mapping_page() error. Skipping " - "page (index 0x%lx).", index); - nr_free -= PAGE_SIZE * 8; - continue; - } - kaddr = kmap_atomic(page); - /* - * 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(). - */ - nr_free -= bitmap_weight(kaddr, - PAGE_SIZE * BITS_PER_BYTE); - kunmap_atomic(kaddr); - put_page(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 occurred 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 - * @nr_free: number of mft records in filesystem - * @max_index: maximum number of pages containing set bits - * - * 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, const pgoff_t max_index) -{ - struct address_space *mapping = vol->mftbmp_ino->i_mapping; - struct page *page; - pgoff_t index; - - ntfs_debug("Entering."); - /* Use multiples of 4 bytes, thus max_size is PAGE_SIZE / 4. */ - ntfs_debug("Reading $MFT/$BITMAP, max_index = 0x%lx, max_size = " - "0x%lx.", max_index, PAGE_SIZE / 4); - for (index = 0; index < max_index; index++) { - unsigned long *kaddr; - - /* - * Read the page from page cache, getting it from backing store - * if necessary, and increment the use count. - */ - page = read_mapping_page(mapping, index, NULL); - /* Ignore pages which errored synchronously. */ - if (IS_ERR(page)) { - ntfs_debug("read_mapping_page() error. Skipping " - "page (index 0x%lx).", index); - nr_free -= PAGE_SIZE * 8; - continue; - } - kaddr = kmap_atomic(page); - /* - * 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(). - */ - nr_free -= bitmap_weight(kaddr, - PAGE_SIZE * BITS_PER_BYTE); - kunmap_atomic(kaddr); - put_page(page); - } - ntfs_debug("Finished reading $MFT/$BITMAP, last index = 0x%lx.", - index - 1); - /* If errors occurred 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 - * @dentry: dentry from mounted volume - * @sfs: statfs structure in which to return the information - * - * Return information about the mounted NTFS volume @dentry 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 dentry *dentry, struct kstatfs *sfs) -{ - struct super_block *sb = dentry->d_sb; - s64 size; - ntfs_volume *vol = NTFS_SB(sb); - ntfs_inode *mft_ni = NTFS_I(vol->mft_ino); - pgoff_t max_index; - unsigned long flags; - - ntfs_debug("Entering."); - /* Type of filesystem. */ - sfs->f_type = NTFS_SB_MAGIC; - /* Optimal transfer block size. */ - sfs->f_bsize = PAGE_SIZE; - /* - * Total data blocks in filesystem 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_SHIFT; - /* Free data blocks in filesystem in units of f_bsize. */ - size = get_nr_free_clusters(vol) << vol->cluster_size_bits >> - PAGE_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); - read_lock_irqsave(&mft_ni->size_lock, flags); - size = i_size_read(vol->mft_ino) >> vol->mft_record_size_bits; - /* - * Convert the maximum number of set bits into bytes rounded up, then - * convert into multiples of PAGE_SIZE, rounding up so that if we - * have one full and one partial page max_index = 2. - */ - max_index = ((((mft_ni->initialized_size >> vol->mft_record_size_bits) - + 7) >> 3) + PAGE_SIZE - 1) >> PAGE_SHIFT; - read_unlock_irqrestore(&mft_ni->size_lock, flags); - /* Number of inodes in filesystem (at this point in time). */ - sfs->f_files = size; - /* Free inodes in fs (based on current total count). */ - sfs->f_ffree = __get_nr_free_mft_records(vol, size, max_index); - 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 filesystem driver, the latter is already given - * by the filesystem 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 = u64_to_fsid(vol->serial_no); - /* Maximum length of filenames. */ - sfs->f_namelen = NTFS_MAX_NAME_LEN; - return 0; -} - -#ifdef NTFS_RW -static int ntfs_write_inode(struct inode *vi, struct writeback_control *wbc) -{ - return __ntfs_write_inode(vi, wbc->sync_mode == WB_SYNC_ALL); -} -#endif - -/* - * The complete super operations. - */ -static const struct super_operations ntfs_sops = { - .alloc_inode = ntfs_alloc_big_inode, /* VFS: Allocate new inode. */ - .free_inode = ntfs_free_big_inode, /* VFS: Deallocate inode. */ -#ifdef NTFS_RW - .write_inode = ntfs_write_inode, /* VFS: Write dirty inode to - disk. */ -#endif /* NTFS_RW */ - .put_super = ntfs_put_super, /* Syscall: umount. */ - .statfs = ntfs_statfs, /* Syscall: statfs */ - .remount_fs = ntfs_remount, /* Syscall: mount -o remount. */ - .evict_inode = ntfs_evict_big_inode, /* VFS: Called when an inode is - removed from memory. */ - .show_options = ntfs_show_options, /* Show mount options in - proc. */ -}; - -/** - * ntfs_fill_super - mount an ntfs filesystem - * @sb: super block of ntfs filesystem 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 filesystem. - * - * If @silent is true, remain silent even if errors are detected. This is used - * during bootup, when the kernel tries to mount the root filesystem with all - * registered filesystems one after the other until one succeeds. This implies - * that all filesystems 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 blocksize, result; - - /* - * We do a pretty difficult piece of bootstrap by reading the - * MFT (and other metadata) from disk into memory. We'll only - * release this metadata during umount, so the locking patterns - * observed during bootstrap do not count. So turn off the - * observation of locking patterns (strictly for this context - * only) while mounting NTFS. [The validator is still active - * otherwise, even for this context: it will for example record - * lock class registrations.] - */ - lockdep_off(); - ntfs_debug("Entering."); -#ifndef NTFS_RW - sb->s_flags |= SB_RDONLY; -#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..."); - lockdep_on(); - return -ENOMEM; - } - /* Initialize ntfs_volume structure. */ - *vol = (ntfs_volume) { - .sb = sb, - /* - * 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. - */ - .fmask = 0177, - .dmask = 0077, - }; - init_rwsem(&vol->mftbmp_lock); - init_rwsem(&vol->lcnbmp_lock); - - /* By default, enable sparse support. */ - NVolSetSparseEnabled(vol); - - /* Important to get the mount options dealt with now. */ - if (!parse_options(vol, (char*)opt)) - goto err_out_now; - - /* We support sector sizes up to the PAGE_SIZE. */ - if (bdev_logical_block_size(sb->s_bdev) > PAGE_SIZE) { - if (!silent) - ntfs_error(sb, "Device has unsupported sector size " - "(%i). The maximum supported sector " - "size on this architecture is %lu " - "bytes.", - bdev_logical_block_size(sb->s_bdev), - PAGE_SIZE); - goto err_out_now; - } - /* - * Setup the device access block size to NTFS_BLOCK_SIZE or the hard - * sector size, whichever is bigger. - */ - blocksize = sb_min_blocksize(sb, NTFS_BLOCK_SIZE); - if (blocksize < NTFS_BLOCK_SIZE) { - if (!silent) - ntfs_error(sb, "Unable to set device block size."); - goto err_out_now; - } - BUG_ON(blocksize != sb->s_blocksize); - ntfs_debug("Set device block size to %i bytes (block size bits %i).", - blocksize, sb->s_blocksize_bits); - /* Determine the size of the device in units of block_size bytes. */ - vol->nr_blocks = sb_bdev_nr_blocks(sb); - if (!vol->nr_blocks) { - if (!silent) - ntfs_error(sb, "Unable to determine device size."); - goto err_out_now; - } - /* 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 volume - * using it. - */ - result = parse_ntfs_boot_sector(vol, (NTFS_BOOT_SECTOR*)bh->b_data); - brelse(bh); - if (!result) { - if (!silent) - ntfs_error(sb, "Unsupported NTFS filesystem."); - goto err_out_now; - } - /* - * If the boot sector indicates a sector size bigger than the current - * device block size, switch the device block size to the sector size. - * TODO: It may be possible to support this case even when the set - * below fails, we would just be breaking up the i/o for each sector - * into multiple blocks for i/o purposes but otherwise it should just - * work. However it is safer to leave disabled until someone hits this - * error message and then we can get them to try it without the setting - * so we know for sure that it works. - */ - if (vol->sector_size > blocksize) { - blocksize = sb_set_blocksize(sb, vol->sector_size); - if (blocksize != vol->sector_size) { - if (!silent) - ntfs_error(sb, "Unable to set device block " - "size to sector size (%i).", - vol->sector_size); - goto err_out_now; - } - BUG_ON(blocksize != sb->s_blocksize); - vol->nr_blocks = sb_bdev_nr_blocks(sb); - ntfs_debug("Changed device block size to %i bytes (block size " - "bits %i) to match volume sector size.", - blocksize, sb->s_blocksize_bits); - } - /* Initialize the cluster and mft allocators. */ - ntfs_setup_allocators(vol); - /* 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; - /* Ntfs measures time in 100ns intervals. */ - 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; - } - mutex_lock(&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--; - mutex_unlock(&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++; - mutex_unlock(&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; - } - - /* We grab a reference, simulating an ntfs_iget(). */ - ihold(vol->root_ino); - if ((sb->s_root = d_make_root(vol->root_ino))) { - ntfs_debug("Exiting, status successful."); - /* Release the default upcase if it has no users. */ - mutex_lock(&ntfs_lock); - if (!--ntfs_nr_upcase_users && default_upcase) { - ntfs_free(default_upcase); - default_upcase = NULL; - } - mutex_unlock(&ntfs_lock); - sb->s_export_op = &ntfs_export_ops; - lockdep_on(); - 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->usnjrnl_j_ino) { - iput(vol->usnjrnl_j_ino); - vol->usnjrnl_j_ino = NULL; - } - if (vol->usnjrnl_max_ino) { - iput(vol->usnjrnl_max_ino); - vol->usnjrnl_max_ino = NULL; - } - if (vol->usnjrnl_ino) { - iput(vol->usnjrnl_ino); - vol->usnjrnl_ino = NULL; - } - 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; - mutex_lock(&ntfs_lock); - if (vol->upcase == default_upcase) { - ntfs_nr_upcase_users--; - vol->upcase = NULL; - } - mutex_unlock(&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. - */ - mutex_lock(&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(); - mutex_unlock(&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; - /* Errors at this stage are irrelevant. */ -err_out_now: - sb->s_fs_info = NULL; - kfree(vol); - ntfs_debug("Failed, returning -EINVAL."); - lockdep_on(); - 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. - */ -struct kmem_cache *ntfs_name_cache; - -/* Slab caches for efficient allocation/deallocation of inodes. */ -struct kmem_cache *ntfs_inode_cache; -struct kmem_cache *ntfs_big_inode_cache; - -/* Init once constructor for the inode slab cache. */ -static void ntfs_big_inode_init_once(void *foo) -{ - ntfs_inode *ni = (ntfs_inode *)foo; - - inode_init_once(VFS_I(ni)); -} - -/* - * Slab caches to optimize allocations and deallocations of attribute search - * contexts and index contexts, respectively. - */ -struct kmem_cache *ntfs_attr_ctx_cache; -struct kmem_cache *ntfs_index_ctx_cache; - -/* Driver wide mutex. */ -DEFINE_MUTEX(ntfs_lock); - -static struct dentry *ntfs_mount(struct file_system_type *fs_type, - int flags, const char *dev_name, void *data) -{ - return mount_bdev(fs_type, flags, dev_name, data, ntfs_fill_super); -} - -static struct file_system_type ntfs_fs_type = { - .owner = THIS_MODULE, - .name = "ntfs", - .mount = ntfs_mount, - .kill_sb = kill_block_super, - .fs_flags = FS_REQUIRES_DEV, -}; -MODULE_ALIAS_FS("ntfs"); - -/* 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 */ - pr_info("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 */); - if (!ntfs_index_ctx_cache) { - pr_crit("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 */); - if (!ntfs_attr_ctx_cache) { - pr_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); - if (!ntfs_name_cache) { - pr_crit("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|SLAB_MEM_SPREAD, NULL); - if (!ntfs_inode_cache) { - pr_crit("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|SLAB_MEM_SPREAD| - SLAB_ACCOUNT, ntfs_big_inode_init_once); - if (!ntfs_big_inode_cache) { - pr_crit("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) { - pr_crit("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! */ - } - pr_crit("Failed to register NTFS filesystem driver!\n"); - - /* Unregister the ntfs sysctls. */ - ntfs_sysctl(0); -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) { - pr_crit("Aborting NTFS filesystem driver registration...\n"); - err = -ENOMEM; - } - return err; -} - -static void __exit exit_ntfs_fs(void) -{ - ntfs_debug("Unregistering NTFS driver."); - - unregister_filesystem(&ntfs_fs_type); - - /* - * Make sure all delayed rcu free inodes are flushed before we - * destroy cache. - */ - rcu_barrier(); - kmem_cache_destroy(ntfs_big_inode_cache); - kmem_cache_destroy(ntfs_inode_cache); - kmem_cache_destroy(ntfs_name_cache); - kmem_cache_destroy(ntfs_attr_ctx_cache); - kmem_cache_destroy(ntfs_index_ctx_cache); - /* Unregister the ntfs sysctls. */ - ntfs_sysctl(0); -} - -MODULE_AUTHOR("Anton Altaparmakov <anton@tuxera.com>"); -MODULE_DESCRIPTION("NTFS 1.2/3.x driver - Copyright (c) 2001-2014 Anton Altaparmakov and Tuxera Inc."); -MODULE_VERSION(NTFS_VERSION); -MODULE_LICENSE("GPL"); -#ifdef DEBUG -module_param(debug_msgs, bint, 0); -MODULE_PARM_DESC(debug_msgs, "Enable debug messages."); -#endif - -module_init(init_ntfs_fs) -module_exit(exit_ntfs_fs) |