Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 3196 insertions, 0 deletions

diff --git a/fs/ntfs/super.c b/fs/ntfs/super.c
new file mode 100644
index 000000000..7f69422d5
--- /dev/null
+++ b/fs/ntfs/super.c
@@ -0,0 +1,3196 @@
+// 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 -
+ *
+ * Copied from old ntfs driver (which copied from vfat driver).
+ */
+static int simple_getbool(char *s, bool *setval)
+{
+	if (s) {
+		if (!strcmp(s, "1") || !strcmp(s, "yes") || !strcmp(s, "true"))
+			*setval = true;
+		else if (!strcmp(s, "0") || !strcmp(s, "no") ||
+							!strcmp(s, "false"))
+			*setval = false;
+		else
+			return 0;
+	} else
+		*setval = true;
+	return 1;
+}
+
+/**
+ * parse_options - parse the (re)mount options
+ * @vol:	ntfs volume
+ * @opt:	string containing the (re)mount options
+ *
+ * Parse the recognized options in @opt for the ntfs volume described by @vol.
+ */
+static bool parse_options(ntfs_volume *vol, char *opt)
+{
+	char *p, *v, *ov;
+	static char *utf8 = "utf8";
+	int errors = 0, sloppy = 0;
+	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. */
+	if (!i_size_read(sb->s_bdev->bd_inode)) {
+		if (!silent)
+			ntfs_error(sb, "Unable to determine device size.");
+		goto err_out_now;
+	}
+	vol->nr_blocks = i_size_read(sb->s_bdev->bd_inode) >>
+			sb->s_blocksize_bits;
+	/* Read the boot sector and return unlocked buffer head to it. */
+	if (!(bh = read_ntfs_boot_sector(sb, silent))) {
+		if (!silent)
+			ntfs_error(sb, "Not an NTFS volume.");
+		goto err_out_now;
+	}
+	/*
+	 * Extract the data from the boot sector and setup the ntfs 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 = i_size_read(sb->s_bdev->bd_inode) >>
+				sb->s_blocksize_bits;
+		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)