Adding upstream version 6.1.76.upstream/6.1.76

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

1 files changed, 1517 insertions, 0 deletions

diff --git a/fs/ntfs3/super.c b/fs/ntfs3/super.c
new file mode 100644
index 000000000..6066eea3f
--- /dev/null
+++ b/fs/ntfs3/super.c
@@ -0,0 +1,1517 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *
+ * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
+ *
+ *
+ *                 terminology
+ *
+ * cluster - allocation unit     - 512,1K,2K,4K,...,2M
+ * vcn - virtual cluster number  - Offset inside the file in clusters.
+ * vbo - virtual byte offset     - Offset inside the file in bytes.
+ * lcn - logical cluster number  - 0 based cluster in clusters heap.
+ * lbo - logical byte offset     - Absolute position inside volume.
+ * run - maps VCN to LCN         - Stored in attributes in packed form.
+ * attr - attribute segment      - std/name/data etc records inside MFT.
+ * mi  - MFT inode               - One MFT record(usually 1024 bytes or 4K), consists of attributes.
+ * ni  - NTFS inode              - Extends linux inode. consists of one or more mft inodes.
+ * index - unit inside directory - 2K, 4K, <=page size, does not depend on cluster size.
+ *
+ * WSL - Windows Subsystem for Linux
+ * https://docs.microsoft.com/en-us/windows/wsl/file-permissions
+ * It stores uid/gid/mode/dev in xattr
+ *
+ */
+
+#include <linux/blkdev.h>
+#include <linux/buffer_head.h>
+#include <linux/exportfs.h>
+#include <linux/fs.h>
+#include <linux/fs_context.h>
+#include <linux/fs_parser.h>
+#include <linux/log2.h>
+#include <linux/minmax.h>
+#include <linux/module.h>
+#include <linux/nls.h>
+#include <linux/seq_file.h>
+#include <linux/statfs.h>
+
+#include "debug.h"
+#include "ntfs.h"
+#include "ntfs_fs.h"
+#ifdef CONFIG_NTFS3_LZX_XPRESS
+#include "lib/lib.h"
+#endif
+
+#ifdef CONFIG_PRINTK
+/*
+ * ntfs_printk - Trace warnings/notices/errors.
+ *
+ * Thanks Joe Perches <joe@perches.com> for implementation
+ */
+void ntfs_printk(const struct super_block *sb, const char *fmt, ...)
+{
+	struct va_format vaf;
+	va_list args;
+	int level;
+	struct ntfs_sb_info *sbi = sb->s_fs_info;
+
+	/* Should we use different ratelimits for warnings/notices/errors? */
+	if (!___ratelimit(&sbi->msg_ratelimit, "ntfs3"))
+		return;
+
+	va_start(args, fmt);
+
+	level = printk_get_level(fmt);
+	vaf.fmt = printk_skip_level(fmt);
+	vaf.va = &args;
+	printk("%c%cntfs3: %s: %pV\n", KERN_SOH_ASCII, level, sb->s_id, &vaf);
+
+	va_end(args);
+}
+
+static char s_name_buf[512];
+static atomic_t s_name_buf_cnt = ATOMIC_INIT(1); // 1 means 'free s_name_buf'.
+
+/*
+ * ntfs_inode_printk
+ *
+ * Print warnings/notices/errors about inode using name or inode number.
+ */
+void ntfs_inode_printk(struct inode *inode, const char *fmt, ...)
+{
+	struct super_block *sb = inode->i_sb;
+	struct ntfs_sb_info *sbi = sb->s_fs_info;
+	char *name;
+	va_list args;
+	struct va_format vaf;
+	int level;
+
+	if (!___ratelimit(&sbi->msg_ratelimit, "ntfs3"))
+		return;
+
+	/* Use static allocated buffer, if possible. */
+	name = atomic_dec_and_test(&s_name_buf_cnt)
+		       ? s_name_buf
+		       : kmalloc(sizeof(s_name_buf), GFP_NOFS);
+
+	if (name) {
+		struct dentry *de = d_find_alias(inode);
+		const u32 name_len = ARRAY_SIZE(s_name_buf) - 1;
+
+		if (de) {
+			spin_lock(&de->d_lock);
+			snprintf(name, name_len, " \"%s\"", de->d_name.name);
+			spin_unlock(&de->d_lock);
+			name[name_len] = 0; /* To be sure. */
+		} else {
+			name[0] = 0;
+		}
+		dput(de); /* Cocci warns if placed in branch "if (de)" */
+	}
+
+	va_start(args, fmt);
+
+	level = printk_get_level(fmt);
+	vaf.fmt = printk_skip_level(fmt);
+	vaf.va = &args;
+
+	printk("%c%cntfs3: %s: ino=%lx,%s %pV\n", KERN_SOH_ASCII, level,
+	       sb->s_id, inode->i_ino, name ? name : "", &vaf);
+
+	va_end(args);
+
+	atomic_inc(&s_name_buf_cnt);
+	if (name != s_name_buf)
+		kfree(name);
+}
+#endif
+
+/*
+ * Shared memory struct.
+ *
+ * On-disk ntfs's upcase table is created by ntfs formatter.
+ * 'upcase' table is 128K bytes of memory.
+ * We should read it into memory when mounting.
+ * Several ntfs volumes likely use the same 'upcase' table.
+ * It is good idea to share in-memory 'upcase' table between different volumes.
+ * Unfortunately winxp/vista/win7 use different upcase tables.
+ */
+static DEFINE_SPINLOCK(s_shared_lock);
+
+static struct {
+	void *ptr;
+	u32 len;
+	int cnt;
+} s_shared[8];
+
+/*
+ * ntfs_set_shared
+ *
+ * Return:
+ * * @ptr - If pointer was saved in shared memory.
+ * * NULL - If pointer was not shared.
+ */
+void *ntfs_set_shared(void *ptr, u32 bytes)
+{
+	void *ret = NULL;
+	int i, j = -1;
+
+	spin_lock(&s_shared_lock);
+	for (i = 0; i < ARRAY_SIZE(s_shared); i++) {
+		if (!s_shared[i].cnt) {
+			j = i;
+		} else if (bytes == s_shared[i].len &&
+			   !memcmp(s_shared[i].ptr, ptr, bytes)) {
+			s_shared[i].cnt += 1;
+			ret = s_shared[i].ptr;
+			break;
+		}
+	}
+
+	if (!ret && j != -1) {
+		s_shared[j].ptr = ptr;
+		s_shared[j].len = bytes;
+		s_shared[j].cnt = 1;
+		ret = ptr;
+	}
+	spin_unlock(&s_shared_lock);
+
+	return ret;
+}
+
+/*
+ * ntfs_put_shared
+ *
+ * Return:
+ * * @ptr - If pointer is not shared anymore.
+ * * NULL - If pointer is still shared.
+ */
+void *ntfs_put_shared(void *ptr)
+{
+	void *ret = ptr;
+	int i;
+
+	spin_lock(&s_shared_lock);
+	for (i = 0; i < ARRAY_SIZE(s_shared); i++) {
+		if (s_shared[i].cnt && s_shared[i].ptr == ptr) {
+			if (--s_shared[i].cnt)
+				ret = NULL;
+			break;
+		}
+	}
+	spin_unlock(&s_shared_lock);
+
+	return ret;
+}
+
+static inline void put_mount_options(struct ntfs_mount_options *options)
+{
+	kfree(options->nls_name);
+	unload_nls(options->nls);
+	kfree(options);
+}
+
+enum Opt {
+	Opt_uid,
+	Opt_gid,
+	Opt_umask,
+	Opt_dmask,
+	Opt_fmask,
+	Opt_immutable,
+	Opt_discard,
+	Opt_force,
+	Opt_sparse,
+	Opt_nohidden,
+	Opt_showmeta,
+	Opt_acl,
+	Opt_iocharset,
+	Opt_prealloc,
+	Opt_noacsrules,
+	Opt_err,
+};
+
+static const struct fs_parameter_spec ntfs_fs_parameters[] = {
+	fsparam_u32("uid",			Opt_uid),
+	fsparam_u32("gid",			Opt_gid),
+	fsparam_u32oct("umask",			Opt_umask),
+	fsparam_u32oct("dmask",			Opt_dmask),
+	fsparam_u32oct("fmask",			Opt_fmask),
+	fsparam_flag_no("sys_immutable",	Opt_immutable),
+	fsparam_flag_no("discard",		Opt_discard),
+	fsparam_flag_no("force",		Opt_force),
+	fsparam_flag_no("sparse",		Opt_sparse),
+	fsparam_flag_no("hidden",		Opt_nohidden),
+	fsparam_flag_no("acl",			Opt_acl),
+	fsparam_flag_no("showmeta",		Opt_showmeta),
+	fsparam_flag_no("prealloc",		Opt_prealloc),
+	fsparam_flag_no("acsrules",		Opt_noacsrules),
+	fsparam_string("iocharset",		Opt_iocharset),
+	{}
+};
+
+/*
+ * Load nls table or if @nls is utf8 then return NULL.
+ */
+static struct nls_table *ntfs_load_nls(char *nls)
+{
+	struct nls_table *ret;
+
+	if (!nls)
+		nls = CONFIG_NLS_DEFAULT;
+
+	if (strcmp(nls, "utf8") == 0)
+		return NULL;
+
+	if (strcmp(nls, CONFIG_NLS_DEFAULT) == 0)
+		return load_nls_default();
+
+	ret = load_nls(nls);
+	if (ret)
+		return ret;
+
+	return ERR_PTR(-EINVAL);
+}
+
+static int ntfs_fs_parse_param(struct fs_context *fc,
+			       struct fs_parameter *param)
+{
+	struct ntfs_mount_options *opts = fc->fs_private;
+	struct fs_parse_result result;
+	int opt;
+
+	opt = fs_parse(fc, ntfs_fs_parameters, param, &result);
+	if (opt < 0)
+		return opt;
+
+	switch (opt) {
+	case Opt_uid:
+		opts->fs_uid = make_kuid(current_user_ns(), result.uint_32);
+		if (!uid_valid(opts->fs_uid))
+			return invalf(fc, "ntfs3: Invalid value for uid.");
+		break;
+	case Opt_gid:
+		opts->fs_gid = make_kgid(current_user_ns(), result.uint_32);
+		if (!gid_valid(opts->fs_gid))
+			return invalf(fc, "ntfs3: Invalid value for gid.");
+		break;
+	case Opt_umask:
+		if (result.uint_32 & ~07777)
+			return invalf(fc, "ntfs3: Invalid value for umask.");
+		opts->fs_fmask_inv = ~result.uint_32;
+		opts->fs_dmask_inv = ~result.uint_32;
+		opts->fmask = 1;
+		opts->dmask = 1;
+		break;
+	case Opt_dmask:
+		if (result.uint_32 & ~07777)
+			return invalf(fc, "ntfs3: Invalid value for dmask.");
+		opts->fs_dmask_inv = ~result.uint_32;
+		opts->dmask = 1;
+		break;
+	case Opt_fmask:
+		if (result.uint_32 & ~07777)
+			return invalf(fc, "ntfs3: Invalid value for fmask.");
+		opts->fs_fmask_inv = ~result.uint_32;
+		opts->fmask = 1;
+		break;
+	case Opt_immutable:
+		opts->sys_immutable = result.negated ? 0 : 1;
+		break;
+	case Opt_discard:
+		opts->discard = result.negated ? 0 : 1;
+		break;
+	case Opt_force:
+		opts->force = result.negated ? 0 : 1;
+		break;
+	case Opt_sparse:
+		opts->sparse = result.negated ? 0 : 1;
+		break;
+	case Opt_nohidden:
+		opts->nohidden = result.negated ? 1 : 0;
+		break;
+	case Opt_acl:
+		if (!result.negated)
+#ifdef CONFIG_NTFS3_FS_POSIX_ACL
+			fc->sb_flags |= SB_POSIXACL;
+#else
+			return invalf(fc, "ntfs3: Support for ACL not compiled in!");
+#endif
+		else
+			fc->sb_flags &= ~SB_POSIXACL;
+		break;
+	case Opt_showmeta:
+		opts->showmeta = result.negated ? 0 : 1;
+		break;
+	case Opt_iocharset:
+		kfree(opts->nls_name);
+		opts->nls_name = param->string;
+		param->string = NULL;
+		break;
+	case Opt_prealloc:
+		opts->prealloc = result.negated ? 0 : 1;
+		break;
+	case Opt_noacsrules:
+		opts->noacsrules = result.negated ? 1 : 0;
+		break;
+	default:
+		/* Should not be here unless we forget add case. */
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int ntfs_fs_reconfigure(struct fs_context *fc)
+{
+	struct super_block *sb = fc->root->d_sb;
+	struct ntfs_sb_info *sbi = sb->s_fs_info;
+	struct ntfs_mount_options *new_opts = fc->fs_private;
+	int ro_rw;
+
+	ro_rw = sb_rdonly(sb) && !(fc->sb_flags & SB_RDONLY);
+	if (ro_rw && (sbi->flags & NTFS_FLAGS_NEED_REPLAY)) {
+		errorf(fc, "ntfs3: Couldn't remount rw because journal is not replayed. Please umount/remount instead\n");
+		return -EINVAL;
+	}
+
+	new_opts->nls = ntfs_load_nls(new_opts->nls_name);
+	if (IS_ERR(new_opts->nls)) {
+		new_opts->nls = NULL;
+		errorf(fc, "ntfs3: Cannot load iocharset %s", new_opts->nls_name);
+		return -EINVAL;
+	}
+	if (new_opts->nls != sbi->options->nls)
+		return invalf(fc, "ntfs3: Cannot use different iocharset when remounting!");
+
+	sync_filesystem(sb);
+
+	if (ro_rw && (sbi->volume.flags & VOLUME_FLAG_DIRTY) &&
+	    !new_opts->force) {
+		errorf(fc, "ntfs3: Volume is dirty and \"force\" flag is not set!");
+		return -EINVAL;
+	}
+
+	swap(sbi->options, fc->fs_private);
+
+	return 0;
+}
+
+static struct kmem_cache *ntfs_inode_cachep;
+
+static struct inode *ntfs_alloc_inode(struct super_block *sb)
+{
+	struct ntfs_inode *ni = alloc_inode_sb(sb, ntfs_inode_cachep, GFP_NOFS);
+
+	if (!ni)
+		return NULL;
+
+	memset(ni, 0, offsetof(struct ntfs_inode, vfs_inode));
+
+	mutex_init(&ni->ni_lock);
+
+	return &ni->vfs_inode;
+}
+
+static void ntfs_i_callback(struct rcu_head *head)
+{
+	struct inode *inode = container_of(head, struct inode, i_rcu);
+	struct ntfs_inode *ni = ntfs_i(inode);
+
+	mutex_destroy(&ni->ni_lock);
+
+	kmem_cache_free(ntfs_inode_cachep, ni);
+}
+
+static void ntfs_destroy_inode(struct inode *inode)
+{
+	call_rcu(&inode->i_rcu, ntfs_i_callback);
+}
+
+static void init_once(void *foo)
+{
+	struct ntfs_inode *ni = foo;
+
+	inode_init_once(&ni->vfs_inode);
+}
+
+/*
+ * put_ntfs - Noinline to reduce binary size.
+ */
+static noinline void put_ntfs(struct ntfs_sb_info *sbi)
+{
+	kfree(sbi->new_rec);
+	kvfree(ntfs_put_shared(sbi->upcase));
+	kfree(sbi->def_table);
+
+	wnd_close(&sbi->mft.bitmap);
+	wnd_close(&sbi->used.bitmap);
+
+	if (sbi->mft.ni)
+		iput(&sbi->mft.ni->vfs_inode);
+
+	if (sbi->security.ni)
+		iput(&sbi->security.ni->vfs_inode);
+
+	if (sbi->reparse.ni)
+		iput(&sbi->reparse.ni->vfs_inode);
+
+	if (sbi->objid.ni)
+		iput(&sbi->objid.ni->vfs_inode);
+
+	if (sbi->volume.ni)
+		iput(&sbi->volume.ni->vfs_inode);
+
+	ntfs_update_mftmirr(sbi, 0);
+
+	indx_clear(&sbi->security.index_sii);
+	indx_clear(&sbi->security.index_sdh);
+	indx_clear(&sbi->reparse.index_r);
+	indx_clear(&sbi->objid.index_o);
+	kfree(sbi->compress.lznt);
+#ifdef CONFIG_NTFS3_LZX_XPRESS
+	xpress_free_decompressor(sbi->compress.xpress);
+	lzx_free_decompressor(sbi->compress.lzx);
+#endif
+	kfree(sbi);
+}
+
+static void ntfs_put_super(struct super_block *sb)
+{
+	struct ntfs_sb_info *sbi = sb->s_fs_info;
+
+	/* Mark rw ntfs as clear, if possible. */
+	ntfs_set_state(sbi, NTFS_DIRTY_CLEAR);
+
+	put_mount_options(sbi->options);
+	put_ntfs(sbi);
+	sb->s_fs_info = NULL;
+
+	sync_blockdev(sb->s_bdev);
+}
+
+static int ntfs_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+	struct super_block *sb = dentry->d_sb;
+	struct ntfs_sb_info *sbi = sb->s_fs_info;
+	struct wnd_bitmap *wnd = &sbi->used.bitmap;
+
+	buf->f_type = sb->s_magic;
+	buf->f_bsize = sbi->cluster_size;
+	buf->f_blocks = wnd->nbits;
+
+	buf->f_bfree = buf->f_bavail = wnd_zeroes(wnd);
+	buf->f_fsid.val[0] = sbi->volume.ser_num;
+	buf->f_fsid.val[1] = (sbi->volume.ser_num >> 32);
+	buf->f_namelen = NTFS_NAME_LEN;
+
+	return 0;
+}
+
+static int ntfs_show_options(struct seq_file *m, struct dentry *root)
+{
+	struct super_block *sb = root->d_sb;
+	struct ntfs_sb_info *sbi = sb->s_fs_info;
+	struct ntfs_mount_options *opts = sbi->options;
+	struct user_namespace *user_ns = seq_user_ns(m);
+
+	seq_printf(m, ",uid=%u",
+		  from_kuid_munged(user_ns, opts->fs_uid));
+	seq_printf(m, ",gid=%u",
+		  from_kgid_munged(user_ns, opts->fs_gid));
+	if (opts->fmask)
+		seq_printf(m, ",fmask=%04o", ~opts->fs_fmask_inv);
+	if (opts->dmask)
+		seq_printf(m, ",dmask=%04o", ~opts->fs_dmask_inv);
+	if (opts->nls)
+		seq_printf(m, ",iocharset=%s", opts->nls->charset);
+	else
+		seq_puts(m, ",iocharset=utf8");
+	if (opts->sys_immutable)
+		seq_puts(m, ",sys_immutable");
+	if (opts->discard)
+		seq_puts(m, ",discard");
+	if (opts->sparse)
+		seq_puts(m, ",sparse");
+	if (opts->showmeta)
+		seq_puts(m, ",showmeta");
+	if (opts->nohidden)
+		seq_puts(m, ",nohidden");
+	if (opts->force)
+		seq_puts(m, ",force");
+	if (opts->noacsrules)
+		seq_puts(m, ",noacsrules");
+	if (opts->prealloc)
+		seq_puts(m, ",prealloc");
+	if (sb->s_flags & SB_POSIXACL)
+		seq_puts(m, ",acl");
+
+	return 0;
+}
+
+/*
+ * ntfs_sync_fs - super_operations::sync_fs
+ */
+static int ntfs_sync_fs(struct super_block *sb, int wait)
+{
+	int err = 0, err2;
+	struct ntfs_sb_info *sbi = sb->s_fs_info;
+	struct ntfs_inode *ni;
+	struct inode *inode;
+
+	ni = sbi->security.ni;
+	if (ni) {
+		inode = &ni->vfs_inode;
+		err2 = _ni_write_inode(inode, wait);
+		if (err2 && !err)
+			err = err2;
+	}
+
+	ni = sbi->objid.ni;
+	if (ni) {
+		inode = &ni->vfs_inode;
+		err2 = _ni_write_inode(inode, wait);
+		if (err2 && !err)
+			err = err2;
+	}
+
+	ni = sbi->reparse.ni;
+	if (ni) {
+		inode = &ni->vfs_inode;
+		err2 = _ni_write_inode(inode, wait);
+		if (err2 && !err)
+			err = err2;
+	}
+
+	if (!err)
+		ntfs_set_state(sbi, NTFS_DIRTY_CLEAR);
+
+	ntfs_update_mftmirr(sbi, wait);
+
+	return err;
+}
+
+static const struct super_operations ntfs_sops = {
+	.alloc_inode = ntfs_alloc_inode,
+	.destroy_inode = ntfs_destroy_inode,
+	.evict_inode = ntfs_evict_inode,
+	.put_super = ntfs_put_super,
+	.statfs = ntfs_statfs,
+	.show_options = ntfs_show_options,
+	.sync_fs = ntfs_sync_fs,
+	.write_inode = ntfs3_write_inode,
+};
+
+static struct inode *ntfs_export_get_inode(struct super_block *sb, u64 ino,
+					   u32 generation)
+{
+	struct MFT_REF ref;
+	struct inode *inode;
+
+	ref.low = cpu_to_le32(ino);
+#ifdef CONFIG_NTFS3_64BIT_CLUSTER
+	ref.high = cpu_to_le16(ino >> 32);
+#else
+	ref.high = 0;
+#endif
+	ref.seq = cpu_to_le16(generation);
+
+	inode = ntfs_iget5(sb, &ref, NULL);
+	if (!IS_ERR(inode) && is_bad_inode(inode)) {
+		iput(inode);
+		inode = ERR_PTR(-ESTALE);
+	}
+
+	return inode;
+}
+
+static struct dentry *ntfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
+					int fh_len, int fh_type)
+{
+	return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
+				    ntfs_export_get_inode);
+}
+
+static struct dentry *ntfs_fh_to_parent(struct super_block *sb, struct fid *fid,
+					int fh_len, int fh_type)
+{
+	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
+				    ntfs_export_get_inode);
+}
+
+/* TODO: == ntfs_sync_inode */
+static int ntfs_nfs_commit_metadata(struct inode *inode)
+{
+	return _ni_write_inode(inode, 1);
+}
+
+static const struct export_operations ntfs_export_ops = {
+	.fh_to_dentry = ntfs_fh_to_dentry,
+	.fh_to_parent = ntfs_fh_to_parent,
+	.get_parent = ntfs3_get_parent,
+	.commit_metadata = ntfs_nfs_commit_metadata,
+};
+
+/*
+ * format_size_gb - Return Gb,Mb to print with "%u.%02u Gb".
+ */
+static u32 format_size_gb(const u64 bytes, u32 *mb)
+{
+	/* Do simple right 30 bit shift of 64 bit value. */
+	u64 kbytes = bytes >> 10;
+	u32 kbytes32 = kbytes;
+
+	*mb = (100 * (kbytes32 & 0xfffff) + 0x7ffff) >> 20;
+	if (*mb >= 100)
+		*mb = 99;
+
+	return (kbytes32 >> 20) | (((u32)(kbytes >> 32)) << 12);
+}
+
+static u32 true_sectors_per_clst(const struct NTFS_BOOT *boot)
+{
+	if (boot->sectors_per_clusters <= 0x80)
+		return boot->sectors_per_clusters;
+	if (boot->sectors_per_clusters >= 0xf4) /* limit shift to 2MB max */
+		return 1U << -(s8)boot->sectors_per_clusters;
+	return -EINVAL;
+}
+
+/*
+ * ntfs_init_from_boot - Init internal info from on-disk boot sector.
+ */
+static int ntfs_init_from_boot(struct super_block *sb, u32 sector_size,
+			       u64 dev_size)
+{
+	struct ntfs_sb_info *sbi = sb->s_fs_info;
+	int err;
+	u32 mb, gb, boot_sector_size, sct_per_clst, record_size;
+	u64 sectors, clusters, mlcn, mlcn2;
+	struct NTFS_BOOT *boot;
+	struct buffer_head *bh;
+	struct MFT_REC *rec;
+	u16 fn, ao;
+
+	sbi->volume.blocks = dev_size >> PAGE_SHIFT;
+
+	bh = ntfs_bread(sb, 0);
+	if (!bh)
+		return -EIO;
+
+	err = -EINVAL;
+	boot = (struct NTFS_BOOT *)bh->b_data;
+
+	if (memcmp(boot->system_id, "NTFS    ", sizeof("NTFS    ") - 1))
+		goto out;
+
+	/* 0x55AA is not mandaroty. Thanks Maxim Suhanov*/
+	/*if (0x55 != boot->boot_magic[0] || 0xAA != boot->boot_magic[1])
+	 *	goto out;
+	 */
+
+	boot_sector_size = (u32)boot->bytes_per_sector[1] << 8;
+	if (boot->bytes_per_sector[0] || boot_sector_size < SECTOR_SIZE ||
+	    !is_power_of_2(boot_sector_size)) {
+		goto out;
+	}
+
+	/* cluster size: 512, 1K, 2K, 4K, ... 2M */
+	sct_per_clst = true_sectors_per_clst(boot);
+	if ((int)sct_per_clst < 0)
+		goto out;
+	if (!is_power_of_2(sct_per_clst))
+		goto out;
+
+	mlcn = le64_to_cpu(boot->mft_clst);
+	mlcn2 = le64_to_cpu(boot->mft2_clst);
+	sectors = le64_to_cpu(boot->sectors_per_volume);
+
+	if (mlcn * sct_per_clst >= sectors)
+		goto out;
+
+	if (mlcn2 * sct_per_clst >= sectors)
+		goto out;
+
+	/* Check MFT record size. */
+	if ((boot->record_size < 0 &&
+	     SECTOR_SIZE > (2U << (-boot->record_size))) ||
+	    (boot->record_size >= 0 && !is_power_of_2(boot->record_size))) {
+		goto out;
+	}
+
+	/* Check index record size. */
+	if ((boot->index_size < 0 &&
+	     SECTOR_SIZE > (2U << (-boot->index_size))) ||
+	    (boot->index_size >= 0 && !is_power_of_2(boot->index_size))) {
+		goto out;
+	}
+
+	sbi->volume.size = sectors * boot_sector_size;
+
+	gb = format_size_gb(sbi->volume.size + boot_sector_size, &mb);
+
+	/*
+	 * - Volume formatted and mounted with the same sector size.
+	 * - Volume formatted 4K and mounted as 512.
+	 * - Volume formatted 512 and mounted as 4K.
+	 */
+	if (boot_sector_size != sector_size) {
+		ntfs_warn(
+			sb,
+			"Different NTFS' sector size (%u) and media sector size (%u)",
+			boot_sector_size, sector_size);
+		dev_size += sector_size - 1;
+	}
+
+	sbi->cluster_size = boot_sector_size * sct_per_clst;
+	sbi->cluster_bits = blksize_bits(sbi->cluster_size);
+
+	sbi->mft.lbo = mlcn << sbi->cluster_bits;
+	sbi->mft.lbo2 = mlcn2 << sbi->cluster_bits;
+
+	/* Compare boot's cluster and sector. */
+	if (sbi->cluster_size < boot_sector_size)
+		goto out;
+
+	/* Compare boot's cluster and media sector. */
+	if (sbi->cluster_size < sector_size) {
+		/* No way to use ntfs_get_block in this case. */
+		ntfs_err(
+			sb,
+			"Failed to mount 'cause NTFS's cluster size (%u) is less than media sector size (%u)",
+			sbi->cluster_size, sector_size);
+		goto out;
+	}
+
+	sbi->cluster_mask = sbi->cluster_size - 1;
+	sbi->cluster_mask_inv = ~(u64)sbi->cluster_mask;
+	sbi->record_size = record_size = boot->record_size < 0
+						 ? 1 << (-boot->record_size)
+						 : (u32)boot->record_size
+							   << sbi->cluster_bits;
+
+	if (record_size > MAXIMUM_BYTES_PER_MFT || record_size < SECTOR_SIZE)
+		goto out;
+
+	sbi->record_bits = blksize_bits(record_size);
+	sbi->attr_size_tr = (5 * record_size >> 4); // ~320 bytes
+
+	sbi->max_bytes_per_attr =
+		record_size - ALIGN(MFTRECORD_FIXUP_OFFSET_1, 8) -
+		ALIGN(((record_size >> SECTOR_SHIFT) * sizeof(short)), 8) -
+		ALIGN(sizeof(enum ATTR_TYPE), 8);
+
+	sbi->index_size = boot->index_size < 0
+				  ? 1u << (-boot->index_size)
+				  : (u32)boot->index_size << sbi->cluster_bits;
+
+	sbi->volume.ser_num = le64_to_cpu(boot->serial_num);
+
+	/* Warning if RAW volume. */
+	if (dev_size < sbi->volume.size + boot_sector_size) {
+		u32 mb0, gb0;
+
+		gb0 = format_size_gb(dev_size, &mb0);
+		ntfs_warn(
+			sb,
+			"RAW NTFS volume: Filesystem size %u.%02u Gb > volume size %u.%02u Gb. Mount in read-only",
+			gb, mb, gb0, mb0);
+		sb->s_flags |= SB_RDONLY;
+	}
+
+	clusters = sbi->volume.size >> sbi->cluster_bits;
+#ifndef CONFIG_NTFS3_64BIT_CLUSTER
+	/* 32 bits per cluster. */
+	if (clusters >> 32) {
+		ntfs_notice(
+			sb,
+			"NTFS %u.%02u Gb is too big to use 32 bits per cluster",
+			gb, mb);
+		goto out;
+	}
+#elif BITS_PER_LONG < 64
+#error "CONFIG_NTFS3_64BIT_CLUSTER incompatible in 32 bit OS"
+#endif
+
+	sbi->used.bitmap.nbits = clusters;
+
+	rec = kzalloc(record_size, GFP_NOFS);
+	if (!rec) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	sbi->new_rec = rec;
+	rec->rhdr.sign = NTFS_FILE_SIGNATURE;
+	rec->rhdr.fix_off = cpu_to_le16(MFTRECORD_FIXUP_OFFSET_1);
+	fn = (sbi->record_size >> SECTOR_SHIFT) + 1;
+	rec->rhdr.fix_num = cpu_to_le16(fn);
+	ao = ALIGN(MFTRECORD_FIXUP_OFFSET_1 + sizeof(short) * fn, 8);
+	rec->attr_off = cpu_to_le16(ao);
+	rec->used = cpu_to_le32(ao + ALIGN(sizeof(enum ATTR_TYPE), 8));
+	rec->total = cpu_to_le32(sbi->record_size);
+	((struct ATTRIB *)Add2Ptr(rec, ao))->type = ATTR_END;
+
+	sb_set_blocksize(sb, min_t(u32, sbi->cluster_size, PAGE_SIZE));
+
+	sbi->block_mask = sb->s_blocksize - 1;
+	sbi->blocks_per_cluster = sbi->cluster_size >> sb->s_blocksize_bits;
+	sbi->volume.blocks = sbi->volume.size >> sb->s_blocksize_bits;
+
+	/* Maximum size for normal files. */
+	sbi->maxbytes = (clusters << sbi->cluster_bits) - 1;
+
+#ifdef CONFIG_NTFS3_64BIT_CLUSTER
+	if (clusters >= (1ull << (64 - sbi->cluster_bits)))
+		sbi->maxbytes = -1;
+	sbi->maxbytes_sparse = -1;
+	sb->s_maxbytes = MAX_LFS_FILESIZE;
+#else
+	/* Maximum size for sparse file. */
+	sbi->maxbytes_sparse = (1ull << (sbi->cluster_bits + 32)) - 1;
+	sb->s_maxbytes = 0xFFFFFFFFull << sbi->cluster_bits;
+#endif
+
+	/*
+	 * Compute the MFT zone at two steps.
+	 * It would be nice if we are able to allocate 1/8 of
+	 * total clusters for MFT but not more then 512 MB.
+	 */
+	sbi->zone_max = min_t(CLST, 0x20000000 >> sbi->cluster_bits, clusters >> 3);
+
+	err = 0;
+
+out:
+	brelse(bh);
+
+	return err;
+}
+
+/*
+ * ntfs_fill_super - Try to mount.
+ */
+static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
+{
+	int err;
+	struct ntfs_sb_info *sbi = sb->s_fs_info;
+	struct block_device *bdev = sb->s_bdev;
+	struct inode *inode;
+	struct ntfs_inode *ni;
+	size_t i, tt;
+	CLST vcn, lcn, len;
+	struct ATTRIB *attr;
+	const struct VOLUME_INFO *info;
+	u32 idx, done, bytes;
+	struct ATTR_DEF_ENTRY *t;
+	u16 *shared;
+	struct MFT_REF ref;
+
+	ref.high = 0;
+
+	sbi->sb = sb;
+	sbi->options = fc->fs_private;
+	fc->fs_private = NULL;
+	sb->s_flags |= SB_NODIRATIME;
+	sb->s_magic = 0x7366746e; // "ntfs"
+	sb->s_op = &ntfs_sops;
+	sb->s_export_op = &ntfs_export_ops;
+	sb->s_time_gran = NTFS_TIME_GRAN; // 100 nsec
+	sb->s_xattr = ntfs_xattr_handlers;
+
+	sbi->options->nls = ntfs_load_nls(sbi->options->nls_name);
+	if (IS_ERR(sbi->options->nls)) {
+		sbi->options->nls = NULL;
+		errorf(fc, "Cannot load nls %s", sbi->options->nls_name);
+		err = -EINVAL;
+		goto out;
+	}
+
+	if (bdev_max_discard_sectors(bdev) && bdev_discard_granularity(bdev)) {
+		sbi->discard_granularity = bdev_discard_granularity(bdev);
+		sbi->discard_granularity_mask_inv =
+			~(u64)(sbi->discard_granularity - 1);
+	}
+
+	/* Parse boot. */
+	err = ntfs_init_from_boot(sb, bdev_logical_block_size(bdev),
+				  bdev_nr_bytes(bdev));
+	if (err)
+		goto out;
+
+	/*
+	 * Load $Volume. This should be done before $LogFile
+	 * 'cause 'sbi->volume.ni' is used 'ntfs_set_state'.
+	 */
+	ref.low = cpu_to_le32(MFT_REC_VOL);
+	ref.seq = cpu_to_le16(MFT_REC_VOL);
+	inode = ntfs_iget5(sb, &ref, &NAME_VOLUME);
+	if (IS_ERR(inode)) {
+		ntfs_err(sb, "Failed to load $Volume.");
+		err = PTR_ERR(inode);
+		goto out;
+	}
+
+	ni = ntfs_i(inode);
+
+	/* Load and save label (not necessary). */
+	attr = ni_find_attr(ni, NULL, NULL, ATTR_LABEL, NULL, 0, NULL, NULL);
+
+	if (!attr) {
+		/* It is ok if no ATTR_LABEL */
+	} else if (!attr->non_res && !is_attr_ext(attr)) {
+		/* $AttrDef allows labels to be up to 128 symbols. */
+		err = utf16s_to_utf8s(resident_data(attr),
+				      le32_to_cpu(attr->res.data_size) >> 1,
+				      UTF16_LITTLE_ENDIAN, sbi->volume.label,
+				      sizeof(sbi->volume.label));
+		if (err < 0)
+			sbi->volume.label[0] = 0;
+	} else {
+		/* Should we break mounting here? */
+		//err = -EINVAL;
+		//goto put_inode_out;
+	}
+
+	attr = ni_find_attr(ni, attr, NULL, ATTR_VOL_INFO, NULL, 0, NULL, NULL);
+	if (!attr || is_attr_ext(attr)) {
+		err = -EINVAL;
+		goto put_inode_out;
+	}
+
+	info = resident_data_ex(attr, SIZEOF_ATTRIBUTE_VOLUME_INFO);
+	if (!info) {
+		err = -EINVAL;
+		goto put_inode_out;
+	}
+
+	sbi->volume.major_ver = info->major_ver;
+	sbi->volume.minor_ver = info->minor_ver;
+	sbi->volume.flags = info->flags;
+	sbi->volume.ni = ni;
+
+	/* Load $MFTMirr to estimate recs_mirr. */
+	ref.low = cpu_to_le32(MFT_REC_MIRR);
+	ref.seq = cpu_to_le16(MFT_REC_MIRR);
+	inode = ntfs_iget5(sb, &ref, &NAME_MIRROR);
+	if (IS_ERR(inode)) {
+		ntfs_err(sb, "Failed to load $MFTMirr.");
+		err = PTR_ERR(inode);
+		goto out;
+	}
+
+	sbi->mft.recs_mirr =
+		ntfs_up_cluster(sbi, inode->i_size) >> sbi->record_bits;
+
+	iput(inode);
+
+	/* Load LogFile to replay. */
+	ref.low = cpu_to_le32(MFT_REC_LOG);
+	ref.seq = cpu_to_le16(MFT_REC_LOG);
+	inode = ntfs_iget5(sb, &ref, &NAME_LOGFILE);
+	if (IS_ERR(inode)) {
+		ntfs_err(sb, "Failed to load \x24LogFile.");
+		err = PTR_ERR(inode);
+		goto out;
+	}
+
+	ni = ntfs_i(inode);
+
+	err = ntfs_loadlog_and_replay(ni, sbi);
+	if (err)
+		goto put_inode_out;
+
+	iput(inode);
+
+	if (sbi->flags & NTFS_FLAGS_NEED_REPLAY) {
+		if (!sb_rdonly(sb)) {
+			ntfs_warn(sb,
+				  "failed to replay log file. Can't mount rw!");
+			err = -EINVAL;
+			goto out;
+		}
+	} else if (sbi->volume.flags & VOLUME_FLAG_DIRTY) {
+		if (!sb_rdonly(sb) && !sbi->options->force) {
+			ntfs_warn(
+				sb,
+				"volume is dirty and \"force\" flag is not set!");
+			err = -EINVAL;
+			goto out;
+		}
+	}
+
+	/* Load $MFT. */
+	ref.low = cpu_to_le32(MFT_REC_MFT);
+	ref.seq = cpu_to_le16(1);
+
+	inode = ntfs_iget5(sb, &ref, &NAME_MFT);
+	if (IS_ERR(inode)) {
+		ntfs_err(sb, "Failed to load $MFT.");
+		err = PTR_ERR(inode);
+		goto out;
+	}
+
+	ni = ntfs_i(inode);
+
+	sbi->mft.used = ni->i_valid >> sbi->record_bits;
+	tt = inode->i_size >> sbi->record_bits;
+	sbi->mft.next_free = MFT_REC_USER;
+
+	err = wnd_init(&sbi->mft.bitmap, sb, tt);
+	if (err)
+		goto put_inode_out;
+
+	err = ni_load_all_mi(ni);
+	if (err)
+		goto put_inode_out;
+
+	sbi->mft.ni = ni;
+
+	/* Load $BadClus. */
+	ref.low = cpu_to_le32(MFT_REC_BADCLUST);
+	ref.seq = cpu_to_le16(MFT_REC_BADCLUST);
+	inode = ntfs_iget5(sb, &ref, &NAME_BADCLUS);
+	if (IS_ERR(inode)) {
+		ntfs_err(sb, "Failed to load $BadClus.");
+		err = PTR_ERR(inode);
+		goto out;
+	}
+
+	ni = ntfs_i(inode);
+
+	for (i = 0; run_get_entry(&ni->file.run, i, &vcn, &lcn, &len); i++) {
+		if (lcn == SPARSE_LCN)
+			continue;
+
+		if (!sbi->bad_clusters)
+			ntfs_notice(sb, "Volume contains bad blocks");
+
+		sbi->bad_clusters += len;
+	}
+
+	iput(inode);
+
+	/* Load $Bitmap. */
+	ref.low = cpu_to_le32(MFT_REC_BITMAP);
+	ref.seq = cpu_to_le16(MFT_REC_BITMAP);
+	inode = ntfs_iget5(sb, &ref, &NAME_BITMAP);
+	if (IS_ERR(inode)) {
+		ntfs_err(sb, "Failed to load $Bitmap.");
+		err = PTR_ERR(inode);
+		goto out;
+	}
+
+#ifndef CONFIG_NTFS3_64BIT_CLUSTER
+	if (inode->i_size >> 32) {
+		err = -EINVAL;
+		goto put_inode_out;
+	}
+#endif
+
+	/* Check bitmap boundary. */
+	tt = sbi->used.bitmap.nbits;
+	if (inode->i_size < bitmap_size(tt)) {
+		err = -EINVAL;
+		goto put_inode_out;
+	}
+
+	/* Not necessary. */
+	sbi->used.bitmap.set_tail = true;
+	err = wnd_init(&sbi->used.bitmap, sb, tt);
+	if (err)
+		goto put_inode_out;
+
+	iput(inode);
+
+	/* Compute the MFT zone. */
+	err = ntfs_refresh_zone(sbi);
+	if (err)
+		goto out;
+
+	/* Load $AttrDef. */
+	ref.low = cpu_to_le32(MFT_REC_ATTR);
+	ref.seq = cpu_to_le16(MFT_REC_ATTR);
+	inode = ntfs_iget5(sb, &ref, &NAME_ATTRDEF);
+	if (IS_ERR(inode)) {
+		ntfs_err(sb, "Failed to load $AttrDef -> %d", err);
+		err = PTR_ERR(inode);
+		goto out;
+	}
+
+	if (inode->i_size < sizeof(struct ATTR_DEF_ENTRY)) {
+		err = -EINVAL;
+		goto put_inode_out;
+	}
+	bytes = inode->i_size;
+	sbi->def_table = t = kvmalloc(bytes, GFP_KERNEL);
+	if (!t) {
+		err = -ENOMEM;
+		goto put_inode_out;
+	}
+
+	for (done = idx = 0; done < bytes; done += PAGE_SIZE, idx++) {
+		unsigned long tail = bytes - done;
+		struct page *page = ntfs_map_page(inode->i_mapping, idx);
+
+		if (IS_ERR(page)) {
+			err = PTR_ERR(page);
+			goto put_inode_out;
+		}
+		memcpy(Add2Ptr(t, done), page_address(page),
+		       min(PAGE_SIZE, tail));
+		ntfs_unmap_page(page);
+
+		if (!idx && ATTR_STD != t->type) {
+			err = -EINVAL;
+			goto put_inode_out;
+		}
+	}
+
+	t += 1;
+	sbi->def_entries = 1;
+	done = sizeof(struct ATTR_DEF_ENTRY);
+	sbi->reparse.max_size = MAXIMUM_REPARSE_DATA_BUFFER_SIZE;
+	sbi->ea_max_size = 0x10000; /* default formatter value */
+
+	while (done + sizeof(struct ATTR_DEF_ENTRY) <= bytes) {
+		u32 t32 = le32_to_cpu(t->type);
+		u64 sz = le64_to_cpu(t->max_sz);
+
+		if ((t32 & 0xF) || le32_to_cpu(t[-1].type) >= t32)
+			break;
+
+		if (t->type == ATTR_REPARSE)
+			sbi->reparse.max_size = sz;
+		else if (t->type == ATTR_EA)
+			sbi->ea_max_size = sz;
+
+		done += sizeof(struct ATTR_DEF_ENTRY);
+		t += 1;
+		sbi->def_entries += 1;
+	}
+	iput(inode);
+
+	/* Load $UpCase. */
+	ref.low = cpu_to_le32(MFT_REC_UPCASE);
+	ref.seq = cpu_to_le16(MFT_REC_UPCASE);
+	inode = ntfs_iget5(sb, &ref, &NAME_UPCASE);
+	if (IS_ERR(inode)) {
+		ntfs_err(sb, "Failed to load $UpCase.");
+		err = PTR_ERR(inode);
+		goto out;
+	}
+
+	if (inode->i_size != 0x10000 * sizeof(short)) {
+		err = -EINVAL;
+		goto put_inode_out;
+	}
+
+	for (idx = 0; idx < (0x10000 * sizeof(short) >> PAGE_SHIFT); idx++) {
+		const __le16 *src;
+		u16 *dst = Add2Ptr(sbi->upcase, idx << PAGE_SHIFT);
+		struct page *page = ntfs_map_page(inode->i_mapping, idx);
+
+		if (IS_ERR(page)) {
+			err = PTR_ERR(page);
+			goto put_inode_out;
+		}
+
+		src = page_address(page);
+
+#ifdef __BIG_ENDIAN
+		for (i = 0; i < PAGE_SIZE / sizeof(u16); i++)
+			*dst++ = le16_to_cpu(*src++);
+#else
+		memcpy(dst, src, PAGE_SIZE);
+#endif
+		ntfs_unmap_page(page);
+	}
+
+	shared = ntfs_set_shared(sbi->upcase, 0x10000 * sizeof(short));
+	if (shared && sbi->upcase != shared) {
+		kvfree(sbi->upcase);
+		sbi->upcase = shared;
+	}
+
+	iput(inode);
+
+	if (is_ntfs3(sbi)) {
+		/* Load $Secure. */
+		err = ntfs_security_init(sbi);
+		if (err)
+			goto out;
+
+		/* Load $Extend. */
+		err = ntfs_extend_init(sbi);
+		if (err)
+			goto load_root;
+
+		/* Load $Extend\$Reparse. */
+		err = ntfs_reparse_init(sbi);
+		if (err)
+			goto load_root;
+
+		/* Load $Extend\$ObjId. */
+		err = ntfs_objid_init(sbi);
+		if (err)
+			goto load_root;
+	}
+
+load_root:
+	/* Load root. */
+	ref.low = cpu_to_le32(MFT_REC_ROOT);
+	ref.seq = cpu_to_le16(MFT_REC_ROOT);
+	inode = ntfs_iget5(sb, &ref, &NAME_ROOT);
+	if (IS_ERR(inode) || !inode->i_op) {
+		ntfs_err(sb, "Failed to load root.");
+		err = IS_ERR(inode) ? PTR_ERR(inode) : -EINVAL;
+		goto out;
+	}
+
+	sb->s_root = d_make_root(inode);
+	if (!sb->s_root) {
+		err = -ENOMEM;
+		goto put_inode_out;
+	}
+
+	return 0;
+
+put_inode_out:
+	iput(inode);
+out:
+	/*
+	 * Free resources here.
+	 * ntfs_fs_free will be called with fc->s_fs_info = NULL
+	 */
+	put_mount_options(sbi->options);
+	put_ntfs(sbi);
+	sb->s_fs_info = NULL;
+
+	return err;
+}
+
+void ntfs_unmap_meta(struct super_block *sb, CLST lcn, CLST len)
+{
+	struct ntfs_sb_info *sbi = sb->s_fs_info;
+	struct block_device *bdev = sb->s_bdev;
+	sector_t devblock = (u64)lcn * sbi->blocks_per_cluster;
+	unsigned long blocks = (u64)len * sbi->blocks_per_cluster;
+	unsigned long cnt = 0;
+	unsigned long limit = global_zone_page_state(NR_FREE_PAGES)
+			      << (PAGE_SHIFT - sb->s_blocksize_bits);
+
+	if (limit >= 0x2000)
+		limit -= 0x1000;
+	else if (limit < 32)
+		limit = 32;
+	else
+		limit >>= 1;
+
+	while (blocks--) {
+		clean_bdev_aliases(bdev, devblock++, 1);
+		if (cnt++ >= limit) {
+			sync_blockdev(bdev);
+			cnt = 0;
+		}
+	}
+}
+
+/*
+ * ntfs_discard - Issue a discard request (trim for SSD).
+ */
+int ntfs_discard(struct ntfs_sb_info *sbi, CLST lcn, CLST len)
+{
+	int err;
+	u64 lbo, bytes, start, end;
+	struct super_block *sb;
+
+	if (sbi->used.next_free_lcn == lcn + len)
+		sbi->used.next_free_lcn = lcn;
+
+	if (sbi->flags & NTFS_FLAGS_NODISCARD)
+		return -EOPNOTSUPP;
+
+	if (!sbi->options->discard)
+		return -EOPNOTSUPP;
+
+	lbo = (u64)lcn << sbi->cluster_bits;
+	bytes = (u64)len << sbi->cluster_bits;
+
+	/* Align up 'start' on discard_granularity. */
+	start = (lbo + sbi->discard_granularity - 1) &
+		sbi->discard_granularity_mask_inv;
+	/* Align down 'end' on discard_granularity. */
+	end = (lbo + bytes) & sbi->discard_granularity_mask_inv;
+
+	sb = sbi->sb;
+	if (start >= end)
+		return 0;
+
+	err = blkdev_issue_discard(sb->s_bdev, start >> 9, (end - start) >> 9,
+				   GFP_NOFS);
+
+	if (err == -EOPNOTSUPP)
+		sbi->flags |= NTFS_FLAGS_NODISCARD;
+
+	return err;
+}
+
+static int ntfs_fs_get_tree(struct fs_context *fc)
+{
+	return get_tree_bdev(fc, ntfs_fill_super);
+}
+
+/*
+ * ntfs_fs_free - Free fs_context.
+ *
+ * Note that this will be called after fill_super and reconfigure
+ * even when they pass. So they have to take pointers if they pass.
+ */
+static void ntfs_fs_free(struct fs_context *fc)
+{
+	struct ntfs_mount_options *opts = fc->fs_private;
+	struct ntfs_sb_info *sbi = fc->s_fs_info;
+
+	if (sbi)
+		put_ntfs(sbi);
+
+	if (opts)
+		put_mount_options(opts);
+}
+
+static const struct fs_context_operations ntfs_context_ops = {
+	.parse_param	= ntfs_fs_parse_param,
+	.get_tree	= ntfs_fs_get_tree,
+	.reconfigure	= ntfs_fs_reconfigure,
+	.free		= ntfs_fs_free,
+};
+
+/*
+ * ntfs_init_fs_context - Initialize spi and opts
+ *
+ * This will called when mount/remount. We will first initialize
+ * options so that if remount we can use just that.
+ */
+static int ntfs_init_fs_context(struct fs_context *fc)
+{
+	struct ntfs_mount_options *opts;
+	struct ntfs_sb_info *sbi;
+
+	opts = kzalloc(sizeof(struct ntfs_mount_options), GFP_NOFS);
+	if (!opts)
+		return -ENOMEM;
+
+	/* Default options. */
+	opts->fs_uid = current_uid();
+	opts->fs_gid = current_gid();
+	opts->fs_fmask_inv = ~current_umask();
+	opts->fs_dmask_inv = ~current_umask();
+
+	if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE)
+		goto ok;
+
+	sbi = kzalloc(sizeof(struct ntfs_sb_info), GFP_NOFS);
+	if (!sbi)
+		goto free_opts;
+
+	sbi->upcase = kvmalloc(0x10000 * sizeof(short), GFP_KERNEL);
+	if (!sbi->upcase)
+		goto free_sbi;
+
+	ratelimit_state_init(&sbi->msg_ratelimit, DEFAULT_RATELIMIT_INTERVAL,
+			     DEFAULT_RATELIMIT_BURST);
+
+	mutex_init(&sbi->compress.mtx_lznt);
+#ifdef CONFIG_NTFS3_LZX_XPRESS
+	mutex_init(&sbi->compress.mtx_xpress);
+	mutex_init(&sbi->compress.mtx_lzx);
+#endif
+
+	fc->s_fs_info = sbi;
+ok:
+	fc->fs_private = opts;
+	fc->ops = &ntfs_context_ops;
+
+	return 0;
+free_sbi:
+	kfree(sbi);
+free_opts:
+	kfree(opts);
+	return -ENOMEM;
+}
+
+// clang-format off
+static struct file_system_type ntfs_fs_type = {
+	.owner			= THIS_MODULE,
+	.name			= "ntfs3",
+	.init_fs_context	= ntfs_init_fs_context,
+	.parameters		= ntfs_fs_parameters,
+	.kill_sb		= kill_block_super,
+	.fs_flags		= FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
+};
+// clang-format on
+
+static int __init init_ntfs_fs(void)
+{
+	int err;
+
+	pr_info("ntfs3: Max link count %u\n", NTFS_LINK_MAX);
+
+	if (IS_ENABLED(CONFIG_NTFS3_FS_POSIX_ACL))
+		pr_info("ntfs3: Enabled Linux POSIX ACLs support\n");
+	if (IS_ENABLED(CONFIG_NTFS3_64BIT_CLUSTER))
+		pr_notice("ntfs3: Warning: Activated 64 bits per cluster. Windows does not support this\n");
+	if (IS_ENABLED(CONFIG_NTFS3_LZX_XPRESS))
+		pr_info("ntfs3: Read-only LZX/Xpress compression included\n");
+
+	err = ntfs3_init_bitmap();
+	if (err)
+		return err;
+
+	ntfs_inode_cachep = kmem_cache_create(
+		"ntfs_inode_cache", sizeof(struct ntfs_inode), 0,
+		(SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD | SLAB_ACCOUNT),
+		init_once);
+	if (!ntfs_inode_cachep) {
+		err = -ENOMEM;
+		goto out1;
+	}
+
+	err = register_filesystem(&ntfs_fs_type);
+	if (err)
+		goto out;
+
+	return 0;
+out:
+	kmem_cache_destroy(ntfs_inode_cachep);
+out1:
+	ntfs3_exit_bitmap();
+	return err;
+}
+
+static void __exit exit_ntfs_fs(void)
+{
+	if (ntfs_inode_cachep) {
+		rcu_barrier();
+		kmem_cache_destroy(ntfs_inode_cachep);
+	}
+
+	unregister_filesystem(&ntfs_fs_type);
+	ntfs3_exit_bitmap();
+}
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("ntfs3 read/write filesystem");
+#ifdef CONFIG_NTFS3_FS_POSIX_ACL
+MODULE_INFO(behaviour, "Enabled Linux POSIX ACLs support");
+#endif
+#ifdef CONFIG_NTFS3_64BIT_CLUSTER
+MODULE_INFO(cluster, "Warning: Activated 64 bits per cluster. Windows does not support this");
+#endif
+#ifdef CONFIG_NTFS3_LZX_XPRESS
+MODULE_INFO(compression, "Read-only lzx/xpress compression included");
+#endif
+
+MODULE_AUTHOR("Konstantin Komarov");
+MODULE_ALIAS_FS("ntfs3");
+
+module_init(init_ntfs_fs);
+module_exit(exit_ntfs_fs);