Add support for the exFAT file system, fix hangs on older intel hardware and update AUFSpck-4.3.3-gnu

1 files changed, 2600 insertions, 0 deletions

diff --git a/fs/exfat/exfat_super.c b/fs/exfat/exfat_super.c
new file mode 100644
index 000000000..a003a7212
--- /dev/null
+++ b/fs/exfat/exfat_super.c
@@ -0,0 +1,2600 @@
+/* Some of the source code in this file came from "linux/fs/fat/file.c","linux/fs/fat/inode.c" and "linux/fs/fat/misc.c".  */
+/*
+ *  linux/fs/fat/file.c
+ *
+ *  Written 1992,1993 by Werner Almesberger
+ *
+ *  regular file handling primitives for fat-based filesystems
+ */
+
+/*
+ *  linux/fs/fat/inode.c
+ *
+ *  Written 1992,1993 by Werner Almesberger
+ *  VFAT extensions by Gordon Chaffee, merged with msdos fs by Henrik Storner
+ *  Rewritten for the constant inumbers support by Al Viro
+ *
+ *  Fixes:
+ *
+ *    Max Cohan: Fixed invalid FSINFO offset when info_sector is 0
+ */
+
+/*
+ *  linux/fs/fat/misc.c
+ *
+ *  Written 1992,1993 by Werner Almesberger
+ *  22/11/2000 - Fixed fat_date_unix2dos for dates earlier than 01/01/1980
+ *         and date_dos2unix for date==0 by Igor Zhbanov(bsg@uniyar.ac.ru)
+ */
+
+/*
+ *  Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
+ *
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License
+ *  as published by the Free Software Foundation; either version 2
+ *  of the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#include <linux/version.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/time.h>
+#include <linux/slab.h>
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37)
+#include <linux/smp_lock.h>
+#endif
+#include <linux/seq_file.h>
+#include <linux/pagemap.h>
+#include <linux/mpage.h>
+#include <linux/buffer_head.h>
+#include <linux/exportfs.h>
+#include <linux/mount.h>
+#include <linux/vfs.h>
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,10,0)
+#include <linux/aio.h>
+#endif
+#include <linux/parser.h>
+#include <linux/uio.h>
+#include <linux/writeback.h>
+#include <linux/log2.h>
+#include <linux/hash.h>
+#include <linux/backing-dev.h>
+#include <linux/sched.h>
+#include <linux/fs_struct.h>
+#include <linux/namei.h>
+#include <asm/current.h>
+#include <asm/unaligned.h>
+
+#include "exfat_version.h"
+#include "exfat_config.h"
+#include "exfat_data.h"
+#include "exfat_oal.h"
+
+#include "exfat_blkdev.h"
+#include "exfat_cache.h"
+#include "exfat_nls.h"
+#include "exfat_api.h"
+#include "exfat_core.h"
+
+#include "exfat_super.h"
+
+static struct kmem_cache *exfat_inode_cachep;
+
+static int exfat_default_codepage = CONFIG_EXFAT_DEFAULT_CODEPAGE;
+static char exfat_default_iocharset[] = CONFIG_EXFAT_DEFAULT_IOCHARSET;
+
+extern struct timezone sys_tz;
+
+#define CHECK_ERR(x)	BUG_ON(x)
+
+#define UNIX_SECS_1980    315532800L
+
+#if BITS_PER_LONG == 64
+#define UNIX_SECS_2108    4354819200L
+#endif
+/* days between 1.1.70 and 1.1.80 (2 leap days) */
+#define DAYS_DELTA_DECADE    (365 * 10 + 2)
+/* 120 (2100 - 1980) isn't leap year */
+#define NO_LEAP_YEAR_2100    (120)
+#define IS_LEAP_YEAR(y)    (!((y) & 0x3) && (y) != NO_LEAP_YEAR_2100)
+
+#define SECS_PER_MIN    (60)
+#define SECS_PER_HOUR   (60 * SECS_PER_MIN)
+#define SECS_PER_DAY    (24 * SECS_PER_HOUR)
+
+#define MAKE_LEAP_YEAR(leap_year, year)                         \
+	do {                                                    \
+		if (unlikely(year > NO_LEAP_YEAR_2100))         \
+			leap_year = ((year + 3) / 4) - 1;       \
+		else                                            \
+			leap_year = ((year + 3) / 4);           \
+	} while (0)
+
+/* Linear day numbers of the respective 1sts in non-leap years. */
+static time_t accum_days_in_year[] = {
+	/* Jan  Feb  Mar  Apr  May  Jun  Jul  Aug  Sep  Oct  Nov  Dec */
+	0,   0,  31,  59,  90, 120, 151, 181, 212, 243, 273, 304, 334, 0, 0, 0,
+};
+
+static void _exfat_truncate(struct inode *inode, loff_t old_size);
+
+/* Convert a FAT time/date pair to a UNIX date (seconds since 1 1 70). */
+void exfat_time_fat2unix(struct exfat_sb_info *sbi, struct timespec *ts,
+						 DATE_TIME_T *tp)
+{
+	time_t year = tp->Year;
+	time_t ld;
+
+	MAKE_LEAP_YEAR(ld, year);
+
+	if (IS_LEAP_YEAR(year) && (tp->Month) > 2)
+		ld++;
+
+	ts->tv_sec =  tp->Second  + tp->Minute * SECS_PER_MIN
+				  + tp->Hour * SECS_PER_HOUR
+				  + (year * 365 + ld + accum_days_in_year[(tp->Month)] + (tp->Day - 1) + DAYS_DELTA_DECADE) * SECS_PER_DAY
+				  + sys_tz.tz_minuteswest * SECS_PER_MIN;
+	ts->tv_nsec = 0;
+}
+
+/* Convert linear UNIX date to a FAT time/date pair. */
+void exfat_time_unix2fat(struct exfat_sb_info *sbi, struct timespec *ts,
+						 DATE_TIME_T *tp)
+{
+	time_t second = ts->tv_sec;
+	time_t day, month, year;
+	time_t ld;
+
+	second -= sys_tz.tz_minuteswest * SECS_PER_MIN;
+
+	/* Jan 1 GMT 00:00:00 1980. But what about another time zone? */
+	if (second < UNIX_SECS_1980) {
+		tp->Second  = 0;
+		tp->Minute  = 0;
+		tp->Hour = 0;
+		tp->Day  = 1;
+		tp->Month  = 1;
+		tp->Year = 0;
+		return;
+	}
+#if (BITS_PER_LONG == 64)
+	if (second >= UNIX_SECS_2108) {
+		tp->Second  = 59;
+		tp->Minute  = 59;
+		tp->Hour = 23;
+		tp->Day  = 31;
+		tp->Month  = 12;
+		tp->Year = 127;
+		return;
+	}
+#endif
+	day = second / SECS_PER_DAY - DAYS_DELTA_DECADE;
+	year = day / 365;
+	MAKE_LEAP_YEAR(ld, year);
+	if (year * 365 + ld > day)
+		year--;
+
+	MAKE_LEAP_YEAR(ld, year);
+	day -= year * 365 + ld;
+
+	if (IS_LEAP_YEAR(year) && day == accum_days_in_year[3]) {
+		month = 2;
+	} else {
+		if (IS_LEAP_YEAR(year) && day > accum_days_in_year[3])
+			day--;
+		for (month = 1; month < 12; month++) {
+			if (accum_days_in_year[month + 1] > day)
+				break;
+		}
+	}
+	day -= accum_days_in_year[month];
+
+	tp->Second  = second % SECS_PER_MIN;
+	tp->Minute  = (second / SECS_PER_MIN) % 60;
+	tp->Hour = (second / SECS_PER_HOUR) % 24;
+	tp->Day  = day + 1;
+	tp->Month  = month;
+	tp->Year = year;
+}
+
+static struct inode *exfat_iget(struct super_block *sb, loff_t i_pos);
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36)
+static int exfat_generic_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg);
+#else
+static long exfat_generic_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
+#endif
+static int exfat_sync_inode(struct inode *inode);
+static struct inode *exfat_build_inode(struct super_block *sb, FILE_ID_T *fid, loff_t i_pos);
+static void exfat_detach(struct inode *inode);
+static void exfat_attach(struct inode *inode, loff_t i_pos);
+static inline unsigned long exfat_hash(loff_t i_pos);
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,34)
+static int exfat_write_inode(struct inode *inode, int wait);
+#else
+static int exfat_write_inode(struct inode *inode, struct writeback_control *wbc);
+#endif
+static void exfat_write_super(struct super_block *sb);
+
+static void __lock_super(struct super_block *sb)
+{
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,7,0)
+	lock_super(sb);
+#else
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	mutex_lock(&sbi->s_lock);
+#endif
+}
+
+static void __unlock_super(struct super_block *sb)
+{
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,7,0)
+	unlock_super(sb);
+#else
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	mutex_unlock(&sbi->s_lock);
+#endif
+}
+
+static int __is_sb_dirty(struct super_block *sb)
+{
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,7,0)
+	return sb->s_dirt;
+#else
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	return sbi->s_dirt;
+#endif
+}
+
+static void __set_sb_clean(struct super_block *sb)
+{
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,7,0)
+	sb->s_dirt = 0;
+#else
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	sbi->s_dirt = 0;
+#endif
+}
+
+static int __exfat_revalidate(struct dentry *dentry)
+{
+	return 0;
+}
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,00)
+static int exfat_revalidate(struct dentry *dentry, unsigned int flags)
+#else
+static int exfat_revalidate(struct dentry *dentry, struct nameidata *nd)
+#endif
+{
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,00)
+	if (flags & LOOKUP_RCU)
+		return -ECHILD;
+#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3,0,00)
+	if (nd && nd->flags & LOOKUP_RCU)
+		return -ECHILD;
+#endif
+
+	if (dentry->d_inode)
+		return 1;
+	return __exfat_revalidate(dentry);
+}
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,00)
+static int exfat_revalidate_ci(struct dentry *dentry, unsigned int flags)
+#else
+static int exfat_revalidate_ci(struct dentry *dentry, struct nameidata *nd)
+#endif
+{
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,00)
+	if (flags & LOOKUP_RCU)
+		return -ECHILD;
+#else
+	unsigned int flags;
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,0,00)
+	if (nd && nd->flags & LOOKUP_RCU)
+		return -ECHILD;
+#endif
+
+	flags = nd ? nd->flags : 0;
+#endif
+
+	if (dentry->d_inode)
+		return 1;
+
+	if (!flags)
+		return 0;
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,0,00)
+	if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
+		return 0;
+#else
+	if (!(nd->flags & (LOOKUP_CONTINUE | LOOKUP_PARENT))) {
+		if (nd->flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
+			return 0;
+	}
+#endif
+
+	return __exfat_revalidate(dentry);
+}
+
+static unsigned int __exfat_striptail_len(unsigned int len, const char *name)
+{
+	while (len && name[len - 1] == '.')
+		len--;
+	return len;
+}
+
+static unsigned int exfat_striptail_len(const struct qstr *qstr)
+{
+	return __exfat_striptail_len(qstr->len, qstr->name);
+}
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0)
+static int exfat_d_hash(const struct dentry *dentry, struct qstr *qstr)
+#elif LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38)
+static int exfat_d_hash(struct dentry *dentry, struct qstr *qstr)
+#else
+static int exfat_d_hash(const struct dentry *dentry, const struct inode *inode,
+		struct qstr *qstr)
+#endif
+{
+	qstr->hash = full_name_hash(qstr->name, exfat_striptail_len(qstr));
+	return 0;
+}
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0)
+static int exfat_d_hashi(const struct dentry *dentry, struct qstr *qstr)
+#elif LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38)
+static int exfat_d_hashi(struct dentry *dentry, struct qstr *qstr)
+#else
+static int exfat_d_hashi(const struct dentry *dentry, const struct inode *inode,
+		struct qstr *qstr)
+#endif
+{
+	struct super_block *sb = dentry->d_sb;
+	const unsigned char *name;
+	unsigned int len;
+	unsigned long hash;
+
+	name = qstr->name;
+	len = exfat_striptail_len(qstr);
+
+	hash = init_name_hash();
+	while (len--)
+		hash = partial_name_hash(nls_upper(sb, *name++), hash);
+	qstr->hash = end_name_hash(hash);
+
+	return 0;
+}
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0)
+static int exfat_cmpi(const struct dentry *parent, const struct dentry *dentry,
+		unsigned int len, const char *str, const struct qstr *name)
+#elif LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38)
+static int exfat_cmpi(struct dentry *parent, struct qstr *a, struct qstr *b)
+#else
+static int exfat_cmpi(const struct dentry *parent, const struct inode *pinode,
+		const struct dentry *dentry, const struct inode *inode,
+		unsigned int len, const char *str, const struct qstr *name)
+#endif
+{
+	struct nls_table *t = EXFAT_SB(parent->d_sb)->nls_io;
+	unsigned int alen, blen;
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38)
+	alen = exfat_striptail_len(a);
+	blen = exfat_striptail_len(b);
+#else
+	alen = exfat_striptail_len(name);
+	blen = __exfat_striptail_len(len, str);
+#endif
+	if (alen == blen) {
+		if (t == NULL) {
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38)
+			if (strncasecmp(a->name, b->name, alen) == 0)
+#else
+			if (strncasecmp(name->name, str, alen) == 0)
+#endif
+				return 0;
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38)
+		} else if (nls_strnicmp(t, a->name, b->name, alen) == 0)
+#else
+		} else if (nls_strnicmp(t, name->name, str, alen) == 0)
+#endif
+			return 0;
+	}
+	return 1;
+}
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0)
+static int exfat_cmp(const struct dentry *parent, const struct dentry *dentry,
+		unsigned int len, const char *str, const struct qstr *name)
+#elif LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38)
+static int exfat_cmp(struct dentry *parent, struct qstr *a,
+			struct qstr *b)
+#else
+static int exfat_cmp(const struct dentry *parent, const struct inode *pinode,
+		const struct dentry *dentry, const struct inode *inode,
+		unsigned int len, const char *str, const struct qstr *name)
+#endif
+{
+	unsigned int alen, blen;
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38)
+	alen = exfat_striptail_len(a);
+	blen = exfat_striptail_len(b);
+#else
+	alen = exfat_striptail_len(name);
+	blen = __exfat_striptail_len(len, str);
+#endif
+	if (alen == blen) {
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38)
+		if (strncmp(a->name, b->name, alen) == 0)
+#else
+		if (strncmp(name->name, str, alen) == 0)
+#endif
+			return 0;
+	}
+	return 1;
+}
+
+static const struct dentry_operations exfat_ci_dentry_ops = {
+	.d_revalidate   = exfat_revalidate_ci,
+	.d_hash         = exfat_d_hashi,
+	.d_compare      = exfat_cmpi,
+};
+
+static const struct dentry_operations exfat_dentry_ops = {
+	.d_revalidate   = exfat_revalidate,
+	.d_hash         = exfat_d_hash,
+	.d_compare      = exfat_cmp,
+};
+
+/*======================================================================*/
+/*  Directory Entry Operations                                          */
+/*======================================================================*/
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0)
+static int exfat_readdir(struct file *filp, struct dir_context *ctx)
+#else
+static int exfat_readdir(struct file *filp, void *dirent, filldir_t filldir)
+#endif
+{
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,9,0)
+	struct inode *inode = file_inode(filp);
+#else
+	struct inode *inode = filp->f_path.dentry->d_inode;
+#endif
+	struct super_block *sb = inode->i_sb;
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	FS_INFO_T *p_fs = &(sbi->fs_info);
+	BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info);
+	DIR_ENTRY_T de;
+	unsigned long inum;
+	loff_t cpos;
+	int err = 0;
+
+	__lock_super(sb);
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0)
+	cpos = ctx->pos;
+#else
+	cpos = filp->f_pos;
+#endif
+	/* Fake . and .. for the root directory. */
+	if ((p_fs->vol_type == EXFAT) || (inode->i_ino == EXFAT_ROOT_INO)) {
+		while (cpos < 2) {
+			if (inode->i_ino == EXFAT_ROOT_INO)
+				inum = EXFAT_ROOT_INO;
+			else if (cpos == 0)
+				inum = inode->i_ino;
+			else /* (cpos == 1) */
+				inum = parent_ino(filp->f_path.dentry);
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0)
+			if (!dir_emit_dots(filp, ctx))
+#else
+			if (filldir(dirent, "..", cpos+1, cpos, inum, DT_DIR) < 0)
+#endif
+				goto out;
+			cpos++;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0)
+			ctx->pos++;
+#else
+			filp->f_pos++;
+#endif
+		}
+		if (cpos == 2)
+			cpos = 0;
+	}
+	if (cpos & (DENTRY_SIZE - 1)) {
+		err = -ENOENT;
+		goto out;
+	}
+
+get_new:
+	EXFAT_I(inode)->fid.size = i_size_read(inode);
+	EXFAT_I(inode)->fid.rwoffset = cpos >> DENTRY_SIZE_BITS;
+
+	err = FsReadDir(inode, &de);
+	if (err) {
+		/* at least we tried to read a sector
+		 * move cpos to next sector position (should be aligned)
+		 */
+		if (err == FFS_MEDIAERR) {
+			cpos += 1 << p_bd->sector_size_bits;
+			cpos &= ~((1 << p_bd->sector_size_bits)-1);
+		}
+
+		err = -EIO;
+		goto end_of_dir;
+	}
+
+	cpos = EXFAT_I(inode)->fid.rwoffset << DENTRY_SIZE_BITS;
+
+	if (!de.Name[0])
+		goto end_of_dir;
+
+	if (!memcmp(de.ShortName, DOS_CUR_DIR_NAME, DOS_NAME_LENGTH)) {
+		inum = inode->i_ino;
+	} else if (!memcmp(de.ShortName, DOS_PAR_DIR_NAME, DOS_NAME_LENGTH)) {
+		inum = parent_ino(filp->f_path.dentry);
+	} else {
+		loff_t i_pos = ((loff_t) EXFAT_I(inode)->fid.start_clu << 32) |
+					   ((EXFAT_I(inode)->fid.rwoffset-1) & 0xffffffff);
+
+		struct inode *tmp = exfat_iget(sb, i_pos);
+		if (tmp) {
+			inum = tmp->i_ino;
+			iput(tmp);
+		} else {
+			inum = iunique(sb, EXFAT_ROOT_INO);
+		}
+	}
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0)
+	if (!dir_emit(ctx, de.Name, strlen(de.Name), inum,
+		(de.Attr & ATTR_SUBDIR) ? DT_DIR : DT_REG))
+#else
+	if (filldir(dirent, de.Name, strlen(de.Name), cpos-1, inum,
+				(de.Attr & ATTR_SUBDIR) ? DT_DIR : DT_REG) < 0)
+#endif
+		goto out;
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0)
+	ctx->pos = cpos;
+#else
+	filp->f_pos = cpos;
+#endif
+	goto get_new;
+
+end_of_dir:
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0)
+	ctx->pos = cpos;
+#else
+	filp->f_pos = cpos;
+#endif
+out:
+	__unlock_super(sb);
+	return err;
+}
+
+static int exfat_ioctl_volume_id(struct inode *dir)
+{
+	struct super_block *sb = dir->i_sb;
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	FS_INFO_T *p_fs = &(sbi->fs_info);
+
+	return p_fs->vol_id;
+}
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36)
+static int exfat_generic_ioctl(struct inode *inode, struct file *filp,
+							   unsigned int cmd, unsigned long arg)
+#else
+static long exfat_generic_ioctl(struct file *filp,
+								unsigned int cmd, unsigned long arg)
+#endif
+{
+#if !(LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36))
+    #if !(LINUX_VERSION_CODE < KERNEL_VERSION(3,18,3))
+		  struct inode *inode = filp->f_path.dentry->d_inode;
+    #else
+		  struct inode *inode = filp->f_dentry->d_inode;
+	#endif
+#endif
+#ifdef CONFIG_EXFAT_KERNEL_DEBUG
+	unsigned int flags;
+#endif /* CONFIG_EXFAT_KERNEL_DEBUG */
+
+	switch (cmd) {
+	case EXFAT_IOCTL_GET_VOLUME_ID:
+		return exfat_ioctl_volume_id(inode);
+#ifdef CONFIG_EXFAT_KERNEL_DEBUG
+	case EXFAT_IOC_GET_DEBUGFLAGS: {
+		struct super_block *sb = inode->i_sb;
+		struct exfat_sb_info *sbi = EXFAT_SB(sb);
+
+		flags = sbi->debug_flags;
+		return put_user(flags, (int __user *)arg);
+	}
+	case EXFAT_IOC_SET_DEBUGFLAGS: {
+		struct super_block *sb = inode->i_sb;
+		struct exfat_sb_info *sbi = EXFAT_SB(sb);
+
+		if (!capable(CAP_SYS_ADMIN))
+			return -EPERM;
+
+		if (get_user(flags, (int __user *) arg))
+			return -EFAULT;
+
+		__lock_super(sb);
+		sbi->debug_flags = flags;
+		__unlock_super(sb);
+
+		return 0;
+	}
+#endif /* CONFIG_EXFAT_KERNEL_DEBUG */
+	default:
+		return -ENOTTY; /* Inappropriate ioctl for device */
+	}
+}
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36)
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35)
+static int exfat_file_fsync(struct file *filp, struct dentry *dentry,
+				int datasync)
+#else
+static int exfat_file_fsync(struct file *filp, int datasync)
+#endif
+{
+	struct inode *inode = filp->f_mapping->host;
+	struct super_block *sb = inode->i_sb;
+	int res, err;
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35)
+	res = simple_fsync(filp, dentry, datasync);
+#else
+	res = generic_file_fsync(filp, datasync);
+#endif
+	err = FsSyncVol(sb, 1);
+
+	return res ? res : err;
+}
+#endif
+
+const struct file_operations exfat_dir_operations = {
+	.llseek     = generic_file_llseek,
+	.read       = generic_read_dir,
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0)
+	.iterate    = exfat_readdir,
+#else
+	.readdir    = exfat_readdir,
+#endif
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36)
+	.ioctl      = exfat_generic_ioctl,
+	.fsync      = exfat_file_fsync,
+#else
+	.unlocked_ioctl = exfat_generic_ioctl,
+	.fsync      = generic_file_fsync,
+#endif
+};
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,00)
+static int exfat_create(struct inode *dir, struct dentry *dentry, umode_t mode,
+						bool excl)
+#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3,3,0)
+static int exfat_create(struct inode *dir, struct dentry *dentry, umode_t mode,
+						struct nameidata *nd)
+#else
+static int exfat_create(struct inode *dir, struct dentry *dentry, int mode,
+						struct nameidata *nd)
+#endif
+{
+	struct super_block *sb = dir->i_sb;
+	struct inode *inode;
+	struct timespec ts;
+	FILE_ID_T fid;
+	loff_t i_pos;
+	int err;
+
+	__lock_super(sb);
+
+	DPRINTK("exfat_create entered\n");
+
+	ts = CURRENT_TIME_SEC;
+
+	err = FsCreateFile(dir, (u8 *) dentry->d_name.name, FM_REGULAR, &fid);
+	if (err) {
+		if (err == FFS_INVALIDPATH)
+			err = -EINVAL;
+		else if (err == FFS_FILEEXIST)
+			err = -EEXIST;
+		else if (err == FFS_FULL)
+			err = -ENOSPC;
+		else if (err == FFS_NAMETOOLONG)
+			err = -ENAMETOOLONG;
+		else
+			err = -EIO;
+		goto out;
+	}
+	dir->i_version++;
+	dir->i_ctime = dir->i_mtime = dir->i_atime = ts;
+	if (IS_DIRSYNC(dir))
+		(void) exfat_sync_inode(dir);
+	else
+		mark_inode_dirty(dir);
+
+	i_pos = ((loff_t) fid.dir.dir << 32) | (fid.entry & 0xffffffff);
+
+	inode = exfat_build_inode(sb, &fid, i_pos);
+	if (IS_ERR(inode)) {
+		err = PTR_ERR(inode);
+		goto out;
+	}
+	inode->i_version++;
+	inode->i_mtime = inode->i_atime = inode->i_ctime = ts;
+	/* timestamp is already written, so mark_inode_dirty() is unnecessary. */
+
+	dentry->d_time = dentry->d_parent->d_inode->i_version;
+	d_instantiate(dentry, inode);
+
+out:
+	__unlock_super(sb);
+	DPRINTK("exfat_create exited\n");
+	return err;
+}
+
+static int exfat_find(struct inode *dir, struct qstr *qname,
+					  FILE_ID_T *fid)
+{
+	int err;
+
+	if (qname->len == 0)
+		return -ENOENT;
+
+	err = FsLookupFile(dir, (u8 *) qname->name, fid);
+	if (err)
+		return -ENOENT;
+
+	return 0;
+}
+
+static int exfat_d_anon_disconn(struct dentry *dentry)
+{
+	return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED);
+}
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,00)
+static struct dentry *exfat_lookup(struct inode *dir, struct dentry *dentry,
+						   unsigned int flags)
+#else
+static struct dentry *exfat_lookup(struct inode *dir, struct dentry *dentry,
+						   struct nameidata *nd)
+#endif
+{
+	struct super_block *sb = dir->i_sb;
+	struct inode *inode;
+	struct dentry *alias;
+	int err;
+	FILE_ID_T fid;
+	loff_t i_pos;
+	u64 ret;
+	mode_t i_mode;
+
+	__lock_super(sb);
+	DPRINTK("exfat_lookup entered\n");
+	err = exfat_find(dir, &dentry->d_name, &fid);
+	if (err) {
+		if (err == -ENOENT) {
+			inode = NULL;
+			goto out;
+		}
+		goto error;
+	}
+
+	i_pos = ((loff_t) fid.dir.dir << 32) | (fid.entry & 0xffffffff);
+	inode = exfat_build_inode(sb, &fid, i_pos);
+	if (IS_ERR(inode)) {
+		err = PTR_ERR(inode);
+		goto error;
+	}
+
+	i_mode = inode->i_mode;
+	if (S_ISLNK(i_mode)) {
+		EXFAT_I(inode)->target = kmalloc(i_size_read(inode)+1, GFP_KERNEL);
+		if (!EXFAT_I(inode)->target) {
+			err = -ENOMEM;
+			goto error;
+		}
+		FsReadFile(dir, &fid, EXFAT_I(inode)->target, i_size_read(inode), &ret);
+		*(EXFAT_I(inode)->target + i_size_read(inode)) = '\0';
+	}
+
+	alias = d_find_alias(inode);
+	if (alias && !exfat_d_anon_disconn(alias)) {
+		CHECK_ERR(d_unhashed(alias));
+		if (!S_ISDIR(i_mode))
+			d_move(alias, dentry);
+		iput(inode);
+		__unlock_super(sb);
+		DPRINTK("exfat_lookup exited 1\n");
+		return alias;
+	} else {
+		dput(alias);
+	}
+out:
+	__unlock_super(sb);
+	dentry->d_time = dentry->d_parent->d_inode->i_version;
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38)
+	dentry->d_op = sb->s_root->d_op;
+	dentry = d_splice_alias(inode, dentry);
+	if (dentry) {
+		dentry->d_op = sb->s_root->d_op;
+		dentry->d_time = dentry->d_parent->d_inode->i_version;
+	}
+#else
+	dentry = d_splice_alias(inode, dentry);
+	if (dentry)
+		dentry->d_time = dentry->d_parent->d_inode->i_version;
+#endif
+	DPRINTK("exfat_lookup exited 2\n");
+	return dentry;
+
+error:
+	__unlock_super(sb);
+	DPRINTK("exfat_lookup exited 3\n");
+	return ERR_PTR(err);
+}
+
+static int exfat_unlink(struct inode *dir, struct dentry *dentry)
+{
+	struct inode *inode = dentry->d_inode;
+	struct super_block *sb = dir->i_sb;
+	struct timespec ts;
+	int err;
+
+	__lock_super(sb);
+
+	DPRINTK("exfat_unlink entered\n");
+
+	ts = CURRENT_TIME_SEC;
+
+	EXFAT_I(inode)->fid.size = i_size_read(inode);
+
+	err = FsRemoveFile(dir, &(EXFAT_I(inode)->fid));
+	if (err) {
+		if (err == FFS_PERMISSIONERR)
+			err = -EPERM;
+		else
+			err = -EIO;
+		goto out;
+	}
+	dir->i_version++;
+	dir->i_mtime = dir->i_atime = ts;
+	if (IS_DIRSYNC(dir))
+		(void) exfat_sync_inode(dir);
+	else
+		mark_inode_dirty(dir);
+
+	clear_nlink(inode);
+	inode->i_mtime = inode->i_atime = ts;
+	exfat_detach(inode);
+	remove_inode_hash(inode);
+
+out:
+	__unlock_super(sb);
+	DPRINTK("exfat_unlink exited\n");
+	return err;
+}
+
+static int exfat_symlink(struct inode *dir, struct dentry *dentry, const char *target)
+{
+	struct super_block *sb = dir->i_sb;
+	struct inode *inode;
+	struct timespec ts;
+	FILE_ID_T fid;
+	loff_t i_pos;
+	int err;
+	u64 len = (u64) strlen(target);
+	u64 ret;
+
+	__lock_super(sb);
+
+	DPRINTK("exfat_symlink entered\n");
+
+	ts = CURRENT_TIME_SEC;
+
+	err = FsCreateFile(dir, (u8 *) dentry->d_name.name, FM_SYMLINK, &fid);
+	if (err) {
+		if (err == FFS_INVALIDPATH)
+			err = -EINVAL;
+		else if (err == FFS_FILEEXIST)
+			err = -EEXIST;
+		else if (err == FFS_FULL)
+			err = -ENOSPC;
+		else
+			err = -EIO;
+		goto out;
+	}
+
+	err = FsWriteFile(dir, &fid, (char *) target, len, &ret);
+
+	if (err) {
+		FsRemoveFile(dir, &fid);
+
+		if (err == FFS_FULL)
+			err = -ENOSPC;
+		else
+			err = -EIO;
+		goto out;
+	}
+
+	dir->i_version++;
+	dir->i_ctime = dir->i_mtime = dir->i_atime = ts;
+	if (IS_DIRSYNC(dir))
+		(void) exfat_sync_inode(dir);
+	else
+		mark_inode_dirty(dir);
+
+	i_pos = ((loff_t) fid.dir.dir << 32) | (fid.entry & 0xffffffff);
+
+	inode = exfat_build_inode(sb, &fid, i_pos);
+	if (IS_ERR(inode)) {
+		err = PTR_ERR(inode);
+		goto out;
+	}
+	inode->i_version++;
+	inode->i_mtime = inode->i_atime = inode->i_ctime = ts;
+	/* timestamp is already written, so mark_inode_dirty() is unneeded. */
+
+	EXFAT_I(inode)->target = kmalloc(len+1, GFP_KERNEL);
+	if (!EXFAT_I(inode)->target) {
+		err = -ENOMEM;
+		goto out;
+	}
+	memcpy(EXFAT_I(inode)->target, target, len+1);
+
+	dentry->d_time = dentry->d_parent->d_inode->i_version;
+	d_instantiate(dentry, inode);
+
+out:
+	__unlock_super(sb);
+	DPRINTK("exfat_symlink exited\n");
+	return err;
+}
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,3,0)
+static int exfat_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+#else
+static int exfat_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+#endif
+{
+	struct super_block *sb = dir->i_sb;
+	struct inode *inode;
+	struct timespec ts;
+	FILE_ID_T fid;
+	loff_t i_pos;
+	int err;
+
+	__lock_super(sb);
+
+	DPRINTK("exfat_mkdir entered\n");
+
+	ts = CURRENT_TIME_SEC;
+
+	err = FsCreateDir(dir, (u8 *) dentry->d_name.name, &fid);
+	if (err) {
+		if (err == FFS_INVALIDPATH)
+			err = -EINVAL;
+		else if (err == FFS_FILEEXIST)
+			err = -EEXIST;
+		else if (err == FFS_FULL)
+			err = -ENOSPC;
+		else if (err == FFS_NAMETOOLONG)
+			err = -ENAMETOOLONG;
+		else
+			err = -EIO;
+		goto out;
+	}
+	dir->i_version++;
+	dir->i_ctime = dir->i_mtime = dir->i_atime = ts;
+	if (IS_DIRSYNC(dir))
+		(void) exfat_sync_inode(dir);
+	else
+		mark_inode_dirty(dir);
+	inc_nlink(dir);
+
+	i_pos = ((loff_t) fid.dir.dir << 32) | (fid.entry & 0xffffffff);
+
+	inode = exfat_build_inode(sb, &fid, i_pos);
+	if (IS_ERR(inode)) {
+		err = PTR_ERR(inode);
+		goto out;
+	}
+	inode->i_version++;
+	inode->i_mtime = inode->i_atime = inode->i_ctime = ts;
+	/* timestamp is already written, so mark_inode_dirty() is unneeded. */
+
+	dentry->d_time = dentry->d_parent->d_inode->i_version;
+	d_instantiate(dentry, inode);
+
+out:
+	__unlock_super(sb);
+	DPRINTK("exfat_mkdir exited\n");
+	return err;
+}
+
+static int exfat_rmdir(struct inode *dir, struct dentry *dentry)
+{
+	struct inode *inode = dentry->d_inode;
+	struct super_block *sb = dir->i_sb;
+	struct timespec ts;
+	int err;
+
+	__lock_super(sb);
+
+	DPRINTK("exfat_rmdir entered\n");
+
+	ts = CURRENT_TIME_SEC;
+
+	EXFAT_I(inode)->fid.size = i_size_read(inode);
+
+	err = FsRemoveDir(dir, &(EXFAT_I(inode)->fid));
+	if (err) {
+		if (err == FFS_INVALIDPATH)
+			err = -EINVAL;
+		else if (err == FFS_FILEEXIST)
+			err = -ENOTEMPTY;
+		else if (err == FFS_NOTFOUND)
+			err = -ENOENT;
+		else if (err == FFS_DIRBUSY)
+			err = -EBUSY;
+		else
+			err = -EIO;
+		goto out;
+	}
+	dir->i_version++;
+	dir->i_mtime = dir->i_atime = ts;
+	if (IS_DIRSYNC(dir))
+		(void) exfat_sync_inode(dir);
+	else
+		mark_inode_dirty(dir);
+	drop_nlink(dir);
+
+	clear_nlink(inode);
+	inode->i_mtime = inode->i_atime = ts;
+	exfat_detach(inode);
+	remove_inode_hash(inode);
+
+out:
+	__unlock_super(sb);
+	DPRINTK("exfat_rmdir exited\n");
+	return err;
+}
+
+static int exfat_rename(struct inode *old_dir, struct dentry *old_dentry,
+						struct inode *new_dir, struct dentry *new_dentry)
+{
+	struct inode *old_inode, *new_inode;
+	struct super_block *sb = old_dir->i_sb;
+	struct timespec ts;
+	loff_t i_pos;
+	int err;
+
+	__lock_super(sb);
+
+	DPRINTK("exfat_rename entered\n");
+
+	old_inode = old_dentry->d_inode;
+	new_inode = new_dentry->d_inode;
+
+	ts = CURRENT_TIME_SEC;
+
+	EXFAT_I(old_inode)->fid.size = i_size_read(old_inode);
+
+	err = FsMoveFile(old_dir, &(EXFAT_I(old_inode)->fid), new_dir, new_dentry);
+	if (err) {
+		if (err == FFS_PERMISSIONERR)
+			err = -EPERM;
+		else if (err == FFS_INVALIDPATH)
+			err = -EINVAL;
+		else if (err == FFS_FILEEXIST)
+			err = -EEXIST;
+		else if (err == FFS_NOTFOUND)
+			err = -ENOENT;
+		else if (err == FFS_FULL)
+			err = -ENOSPC;
+		else
+			err = -EIO;
+		goto out;
+	}
+	new_dir->i_version++;
+	new_dir->i_ctime = new_dir->i_mtime = new_dir->i_atime = ts;
+	if (IS_DIRSYNC(new_dir))
+		(void) exfat_sync_inode(new_dir);
+	else
+		mark_inode_dirty(new_dir);
+
+	i_pos = ((loff_t) EXFAT_I(old_inode)->fid.dir.dir << 32) |
+			(EXFAT_I(old_inode)->fid.entry & 0xffffffff);
+
+	exfat_detach(old_inode);
+	exfat_attach(old_inode, i_pos);
+	if (IS_DIRSYNC(new_dir))
+		(void) exfat_sync_inode(old_inode);
+	else
+		mark_inode_dirty(old_inode);
+
+	if ((S_ISDIR(old_inode->i_mode)) && (old_dir != new_dir)) {
+		drop_nlink(old_dir);
+		if (!new_inode)
+			inc_nlink(new_dir);
+	}
+
+	old_dir->i_version++;
+	old_dir->i_ctime = old_dir->i_mtime = ts;
+	if (IS_DIRSYNC(old_dir))
+		(void) exfat_sync_inode(old_dir);
+	else
+		mark_inode_dirty(old_dir);
+
+	if (new_inode) {
+		exfat_detach(new_inode);
+		drop_nlink(new_inode);
+		if (S_ISDIR(new_inode->i_mode))
+			drop_nlink(new_inode);
+		new_inode->i_ctime = ts;
+	}
+
+out:
+	__unlock_super(sb);
+	DPRINTK("exfat_rename exited\n");
+	return err;
+}
+
+static int exfat_cont_expand(struct inode *inode, loff_t size)
+{
+	struct address_space *mapping = inode->i_mapping;
+	loff_t start = i_size_read(inode), count = size - i_size_read(inode);
+	int err, err2;
+
+	err = generic_cont_expand_simple(inode, size);
+	if (err != 0)
+		return err;
+
+	inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
+	mark_inode_dirty(inode);
+
+	if (IS_SYNC(inode)) {
+		err = filemap_fdatawrite_range(mapping, start, start + count - 1);
+		err2 = sync_mapping_buffers(mapping);
+		err = (err) ? (err) : (err2);
+		err2 = write_inode_now(inode, 1);
+		err = (err) ? (err) : (err2);
+		if (!err)
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32)
+			err =  wait_on_page_writeback_range(mapping,
+					start >> PAGE_CACHE_SHIFT,
+					(start + count - 1) >> PAGE_CACHE_SHIFT);
+#else
+			err =  filemap_fdatawait_range(mapping, start, start + count - 1);
+#endif
+	}
+	return err;
+}
+
+static int exfat_allow_set_time(struct exfat_sb_info *sbi, struct inode *inode)
+{
+	mode_t allow_utime = sbi->options.allow_utime;
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,5,0)
+	if (!uid_eq(current_fsuid(), inode->i_uid))
+#else
+	if (current_fsuid() != inode->i_uid)
+#endif
+	{
+		if (in_group_p(inode->i_gid))
+			allow_utime >>= 3;
+		if (allow_utime & MAY_WRITE)
+			return 1;
+	}
+
+	/* use a default check */
+	return 0;
+}
+
+static int exfat_sanitize_mode(const struct exfat_sb_info *sbi,
+							   struct inode *inode, umode_t *mode_ptr)
+{
+	mode_t i_mode, mask, perm;
+
+	i_mode = inode->i_mode;
+
+	if (S_ISREG(i_mode) || S_ISLNK(i_mode))
+		mask = sbi->options.fs_fmask;
+	else
+		mask = sbi->options.fs_dmask;
+
+	perm = *mode_ptr & ~(S_IFMT | mask);
+
+	/* Of the r and x bits, all (subject to umask) must be present.*/
+	if ((perm & (S_IRUGO | S_IXUGO)) != (i_mode & (S_IRUGO|S_IXUGO)))
+		return -EPERM;
+
+	if (exfat_mode_can_hold_ro(inode)) {
+		/* Of the w bits, either all (subject to umask) or none must be present. */
+		if ((perm & S_IWUGO) && ((perm & S_IWUGO) != (S_IWUGO & ~mask)))
+			return -EPERM;
+	} else {
+		/* If exfat_mode_can_hold_ro(inode) is false, can't change w bits. */
+		if ((perm & S_IWUGO) != (S_IWUGO & ~mask))
+			return -EPERM;
+	}
+
+	*mode_ptr &= S_IFMT | perm;
+
+	return 0;
+}
+
+static int exfat_setattr(struct dentry *dentry, struct iattr *attr)
+{
+
+	struct exfat_sb_info *sbi = EXFAT_SB(dentry->d_sb);
+	struct inode *inode = dentry->d_inode;
+	unsigned int ia_valid;
+	int error;
+#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,35)
+	loff_t old_size;
+#endif
+
+	DPRINTK("exfat_setattr entered\n");
+
+	if ((attr->ia_valid & ATTR_SIZE)
+		&& (attr->ia_size > i_size_read(inode))) {
+		error = exfat_cont_expand(inode, attr->ia_size);
+		if (error || attr->ia_valid == ATTR_SIZE)
+			return error;
+		attr->ia_valid &= ~ATTR_SIZE;
+	}
+
+	ia_valid = attr->ia_valid;
+
+	if ((ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET))
+		&& exfat_allow_set_time(sbi, inode)) {
+		attr->ia_valid &= ~(ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET);
+	}
+
+	error = inode_change_ok(inode, attr);
+	attr->ia_valid = ia_valid;
+	if (error)
+		return error;
+
+	if (((attr->ia_valid & ATTR_UID) &&
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,5,0)
+		 (!uid_eq(attr->ia_uid, sbi->options.fs_uid))) ||
+		((attr->ia_valid & ATTR_GID) &&
+		 (!gid_eq(attr->ia_gid, sbi->options.fs_gid))) ||
+#else
+		 (attr->ia_uid != sbi->options.fs_uid)) ||
+		((attr->ia_valid & ATTR_GID) &&
+		 (attr->ia_gid != sbi->options.fs_gid)) ||
+#endif
+		((attr->ia_valid & ATTR_MODE) &&
+		 (attr->ia_mode & ~(S_IFREG | S_IFLNK | S_IFDIR | S_IRWXUGO)))) {
+		return -EPERM;
+	}
+
+	/*
+	 * We don't return -EPERM here. Yes, strange, but this is too
+	 * old behavior.
+	 */
+	if (attr->ia_valid & ATTR_MODE) {
+		if (exfat_sanitize_mode(sbi, inode, &attr->ia_mode) < 0)
+			attr->ia_valid &= ~ATTR_MODE;
+	}
+
+	EXFAT_I(inode)->fid.size = i_size_read(inode);
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36)
+	if (attr->ia_valid)
+		error = inode_setattr(inode, attr);
+#else
+	if (attr->ia_valid & ATTR_SIZE) {
+		old_size = i_size_read(inode);
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,00)
+		down_write(&EXFAT_I(inode)->truncate_lock);
+		truncate_setsize(inode, attr->ia_size);
+		_exfat_truncate(inode, old_size);
+		up_write(&EXFAT_I(inode)->truncate_lock);
+#else
+		truncate_setsize(inode, attr->ia_size);
+		_exfat_truncate(inode, old_size);
+#endif
+	}
+	setattr_copy(inode, attr);
+	mark_inode_dirty(inode);
+#endif
+
+	DPRINTK("exfat_setattr exited\n");
+	return error;
+}
+
+static int exfat_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
+{
+	struct inode *inode = dentry->d_inode;
+
+	DPRINTK("exfat_getattr entered\n");
+
+	generic_fillattr(inode, stat);
+	stat->blksize = EXFAT_SB(inode->i_sb)->fs_info.cluster_size;
+
+	DPRINTK("exfat_getattr exited\n");
+	return 0;
+}
+
+const struct inode_operations exfat_dir_inode_operations = {
+	.create        = exfat_create,
+	.lookup        = exfat_lookup,
+	.unlink        = exfat_unlink,
+	.symlink       = exfat_symlink,
+	.mkdir         = exfat_mkdir,
+	.rmdir         = exfat_rmdir,
+	.rename        = exfat_rename,
+	.setattr       = exfat_setattr,
+	.getattr       = exfat_getattr,
+};
+
+/*======================================================================*/
+/*  File Operations                                                     */
+/*======================================================================*/
+#if LINUX_VERSION_CODE > KERNEL_VERSION(4,1,0)
+static const char *exfat_follow_link(struct dentry *dentry, void **cookie)
+{
+	struct exfat_inode_info *ei = EXFAT_I(dentry->d_inode);
+	return *cookie = (char *)(ei->target);
+}
+#else
+static void *exfat_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+	struct exfat_inode_info *ei = EXFAT_I(dentry->d_inode);
+	nd_set_link(nd, (char *)(ei->target));
+	return NULL;
+}
+#endif
+
+const struct inode_operations exfat_symlink_inode_operations = {
+	.readlink    = generic_readlink,
+	.follow_link = exfat_follow_link,
+};
+
+static int exfat_file_release(struct inode *inode, struct file *filp)
+{
+	struct super_block *sb = inode->i_sb;
+
+	EXFAT_I(inode)->fid.size = i_size_read(inode);
+	FsSyncVol(sb, 0);
+	return 0;
+}
+
+const struct file_operations exfat_file_operations = {
+	.llseek      = generic_file_llseek,
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,16,0)
+	.read        = do_sync_read,
+	.write       = do_sync_write,
+	.aio_read    = generic_file_aio_read,
+	.aio_write   = generic_file_aio_write,
+#elif LINUX_VERSION_CODE < KERNEL_VERSION(4,1,0)
+	.read        = new_sync_read,
+	.write       = new_sync_write,
+#endif
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,16,0)
+	.read_iter   = generic_file_read_iter,
+	.write_iter  = generic_file_write_iter,
+#endif
+	.mmap        = generic_file_mmap,
+	.release     = exfat_file_release,
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36)
+	.ioctl       = exfat_generic_ioctl,
+	.fsync       = exfat_file_fsync,
+#else
+	.unlocked_ioctl  = exfat_generic_ioctl,
+	.fsync       = generic_file_fsync,
+#endif
+	.splice_read = generic_file_splice_read,
+};
+
+static void _exfat_truncate(struct inode *inode, loff_t old_size)
+{
+	struct super_block *sb = inode->i_sb;
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	FS_INFO_T *p_fs = &(sbi->fs_info);
+	int err;
+
+	__lock_super(sb);
+
+	/*
+	 * This protects against truncating a file bigger than it was then
+	 * trying to write into the hole.
+	 */
+	if (EXFAT_I(inode)->mmu_private > i_size_read(inode))
+		EXFAT_I(inode)->mmu_private = i_size_read(inode);
+
+	if (EXFAT_I(inode)->fid.start_clu == 0)
+		goto out;
+
+	err = FsTruncateFile(inode, old_size, i_size_read(inode));
+	if (err)
+		goto out;
+
+	inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
+	if (IS_DIRSYNC(inode))
+		(void) exfat_sync_inode(inode);
+	else
+		mark_inode_dirty(inode);
+
+	inode->i_blocks = ((i_size_read(inode) + (p_fs->cluster_size - 1))
+					   & ~((loff_t)p_fs->cluster_size - 1)) >> 9;
+out:
+	__unlock_super(sb);
+}
+
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,36)
+static void exfat_truncate(struct inode *inode)
+{
+	_exfat_truncate(inode, i_size_read(inode));
+}
+#endif
+
+const struct inode_operations exfat_file_inode_operations = {
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,36)
+	.truncate    = exfat_truncate,
+#endif
+	.setattr     = exfat_setattr,
+	.getattr     = exfat_getattr,
+};
+
+/*======================================================================*/
+/*  Address Space Operations                                            */
+/*======================================================================*/
+
+static int exfat_bmap(struct inode *inode, sector_t sector, sector_t *phys,
+					  unsigned long *mapped_blocks, int *create)
+{
+	struct super_block *sb = inode->i_sb;
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	FS_INFO_T *p_fs = &(sbi->fs_info);
+	BD_INFO_T *p_bd = &(sbi->bd_info);
+	const unsigned long blocksize = sb->s_blocksize;
+	const unsigned char blocksize_bits = sb->s_blocksize_bits;
+	sector_t last_block;
+	int err, clu_offset, sec_offset;
+	unsigned int cluster;
+
+	*phys = 0;
+	*mapped_blocks = 0;
+
+	if ((p_fs->vol_type == FAT12) || (p_fs->vol_type == FAT16)) {
+		if (inode->i_ino == EXFAT_ROOT_INO) {
+			if (sector < (p_fs->dentries_in_root >> (p_bd->sector_size_bits-DENTRY_SIZE_BITS))) {
+				*phys = sector + p_fs->root_start_sector;
+				*mapped_blocks = 1;
+			}
+			return 0;
+		}
+	}
+
+	last_block = (i_size_read(inode) + (blocksize - 1)) >> blocksize_bits;
+	if (sector >= last_block) {
+		if (*create == 0)
+			return 0;
+	} else {
+		*create = 0;
+	}
+
+	clu_offset = sector >> p_fs->sectors_per_clu_bits;  /* cluster offset */
+	sec_offset = sector & (p_fs->sectors_per_clu - 1);  /* sector offset in cluster */
+
+	EXFAT_I(inode)->fid.size = i_size_read(inode);
+
+	err = FsMapCluster(inode, clu_offset, &cluster);
+
+	if (err) {
+		if (err == FFS_FULL)
+			return -ENOSPC;
+		else
+			return -EIO;
+	} else if (cluster != CLUSTER_32(~0)) {
+		*phys = START_SECTOR(cluster) + sec_offset;
+		*mapped_blocks = p_fs->sectors_per_clu - sec_offset;
+	}
+
+	return 0;
+}
+
+static int exfat_get_block(struct inode *inode, sector_t iblock,
+						   struct buffer_head *bh_result, int create)
+{
+	struct super_block *sb = inode->i_sb;
+	unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
+	int err;
+	unsigned long mapped_blocks;
+	sector_t phys;
+
+	__lock_super(sb);
+
+	err = exfat_bmap(inode, iblock, &phys, &mapped_blocks, &create);
+	if (err) {
+		__unlock_super(sb);
+		return err;
+	}
+
+	if (phys) {
+		max_blocks = min(mapped_blocks, max_blocks);
+		if (create) {
+			EXFAT_I(inode)->mmu_private += max_blocks << sb->s_blocksize_bits;
+			set_buffer_new(bh_result);
+		}
+		map_bh(bh_result, sb, phys);
+	}
+
+	bh_result->b_size = max_blocks << sb->s_blocksize_bits;
+	__unlock_super(sb);
+
+	return 0;
+}
+
+static int exfat_readpage(struct file *file, struct page *page)
+{
+	int ret;
+	ret =  mpage_readpage(page, exfat_get_block);
+	return ret;
+}
+
+static int exfat_readpages(struct file *file, struct address_space *mapping,
+				   struct list_head *pages, unsigned nr_pages)
+{
+	int ret;
+	ret =  mpage_readpages(mapping, pages, nr_pages, exfat_get_block);
+	return ret;
+}
+
+static int exfat_writepage(struct page *page, struct writeback_control *wbc)
+{
+	int ret;
+	ret = block_write_full_page(page, exfat_get_block, wbc);
+	return ret;
+}
+
+static int exfat_writepages(struct address_space *mapping,
+						struct writeback_control *wbc)
+{
+	int ret;
+	ret = mpage_writepages(mapping, wbc, exfat_get_block);
+	return ret;
+}
+
+#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,34)
+static void exfat_write_failed(struct address_space *mapping, loff_t to)
+{
+	struct inode *inode = mapping->host;
+	if (to > i_size_read(inode)) {
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,12,0)
+		truncate_pagecache(inode, i_size_read(inode));
+#else
+		truncate_pagecache(inode, to, i_size_read(inode));
+#endif
+		EXFAT_I(inode)->fid.size = i_size_read(inode);
+		_exfat_truncate(inode, i_size_read(inode));
+	}
+}
+#endif
+
+static int exfat_write_begin(struct file *file, struct address_space *mapping,
+				 loff_t pos, unsigned len, unsigned flags,
+					 struct page **pagep, void **fsdata)
+{
+	int ret;
+	*pagep = NULL;
+	ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
+				   exfat_get_block,
+				   &EXFAT_I(mapping->host)->mmu_private);
+
+#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,34)
+	if (ret < 0)
+		exfat_write_failed(mapping, pos+len);
+#endif
+	return ret;
+}
+
+static int exfat_write_end(struct file *file, struct address_space *mapping,
+				   loff_t pos, unsigned len, unsigned copied,
+					   struct page *pagep, void *fsdata)
+{
+	struct inode *inode = mapping->host;
+	FILE_ID_T *fid = &(EXFAT_I(inode)->fid);
+	int err;
+
+	err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata);
+
+#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,34)
+	if (err < len)
+		exfat_write_failed(mapping, pos+len);
+#endif
+
+	if (!(err < 0) && !(fid->attr & ATTR_ARCHIVE)) {
+		inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
+		fid->attr |= ATTR_ARCHIVE;
+		mark_inode_dirty(inode);
+	}
+	return err;
+}
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,16,0)
+#ifdef CONFIG_AIO_OPTIMIZATION
+static ssize_t exfat_direct_IO(int rw, struct kiocb *iocb,
+						struct iov_iter *iter, loff_t offset)
+#else
+static ssize_t exfat_direct_IO(int rw, struct kiocb *iocb,
+					   const struct iovec *iov,
+					   loff_t offset, unsigned long nr_segs)
+#endif
+#elif LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0)
+static ssize_t exfat_direct_IO(int rw, struct kiocb *iocb,
+					   struct iov_iter *iter, loff_t offset)
+#else /* >= 4.1.x */
+static ssize_t exfat_direct_IO(struct kiocb *iocb,
+					   struct iov_iter *iter, loff_t offset)
+#endif
+{
+	struct inode *inode = iocb->ki_filp->f_mapping->host;
+#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,34)
+	struct address_space *mapping = iocb->ki_filp->f_mapping;
+#endif
+	ssize_t ret;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,2,0)
+	int rw;
+
+	rw = iov_iter_rw(iter);
+#endif
+
+	if (rw == WRITE) {
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,16,0)
+#ifdef CONFIG_AIO_OPTIMIZATION
+		if (EXFAT_I(inode)->mmu_private <
+					(offset + iov_iter_count(iter)))
+#else
+		if (EXFAT_I(inode)->mmu_private < (offset + iov_length(iov, nr_segs)))
+#endif
+#else
+		if (EXFAT_I(inode)->mmu_private < (offset + iov_iter_count(iter)))
+#endif
+			return 0;
+	}
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,1,0)
+	ret = blockdev_direct_IO(iocb, inode, iter,
+					offset, exfat_get_block);
+#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3,16,0)
+	ret = blockdev_direct_IO(rw, iocb, inode, iter,
+					offset, exfat_get_block);
+#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3,1,0)
+#ifdef CONFIG_AIO_OPTIMIZATION
+	ret = blockdev_direct_IO(rw, iocb, inode, iter,
+					offset, exfat_get_block);
+#else
+	ret = blockdev_direct_IO(rw, iocb, inode, iov,
+					offset, nr_segs, exfat_get_block);
+#endif
+#else
+        ret = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
+					offset, nr_segs, exfat_get_block, NULL);
+#endif
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,16,0)
+	if ((ret < 0) && (rw & WRITE))
+		exfat_write_failed(mapping, offset+iov_iter_count(iter));
+#elif LINUX_VERSION_CODE > KERNEL_VERSION(2,6,34)
+	if ((ret < 0) && (rw & WRITE))
+#ifdef CONFIG_AIO_OPTIMIZATION
+		exfat_write_failed(mapping, offset+iov_iter_count(iter));
+#else
+		exfat_write_failed(mapping, offset+iov_length(iov, nr_segs));
+#endif
+#endif
+	return ret;
+}
+
+static sector_t _exfat_bmap(struct address_space *mapping, sector_t block)
+{
+	sector_t blocknr;
+
+	/* exfat_get_cluster() assumes the requested blocknr isn't truncated. */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,00)
+	down_read(&EXFAT_I(mapping->host)->truncate_lock);
+	blocknr = generic_block_bmap(mapping, block, exfat_get_block);
+	up_read(&EXFAT_I(mapping->host)->truncate_lock);
+#else
+	down_read(&EXFAT_I(mapping->host)->i_alloc_sem);
+	blocknr = generic_block_bmap(mapping, block, exfat_get_block);
+	up_read(&EXFAT_I(mapping->host)->i_alloc_sem);
+#endif
+
+	return blocknr;
+}
+
+const struct address_space_operations exfat_aops = {
+	.readpage    = exfat_readpage,
+	.readpages   = exfat_readpages,
+	.writepage   = exfat_writepage,
+	.writepages  = exfat_writepages,
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,39)
+	.sync_page   = block_sync_page,
+#endif
+	.write_begin = exfat_write_begin,
+	.write_end   = exfat_write_end,
+	.direct_IO   = exfat_direct_IO,
+	.bmap        = _exfat_bmap
+};
+
+/*======================================================================*/
+/*  Super Operations                                                    */
+/*======================================================================*/
+
+static inline unsigned long exfat_hash(loff_t i_pos)
+{
+	return hash_32(i_pos, EXFAT_HASH_BITS);
+}
+
+static struct inode *exfat_iget(struct super_block *sb, loff_t i_pos)
+{
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	struct exfat_inode_info *info;
+	struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos);
+	struct inode *inode = NULL;
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,9,0)
+	struct hlist_node *node;
+
+	spin_lock(&sbi->inode_hash_lock);
+	hlist_for_each_entry(info, node, head, i_hash_fat) {
+#else
+	spin_lock(&sbi->inode_hash_lock);
+	hlist_for_each_entry(info, head, i_hash_fat) {
+#endif
+		CHECK_ERR(info->vfs_inode.i_sb != sb);
+
+		if (i_pos != info->i_pos)
+			continue;
+		inode = igrab(&info->vfs_inode);
+		if (inode)
+			break;
+	}
+	spin_unlock(&sbi->inode_hash_lock);
+	return inode;
+}
+
+static void exfat_attach(struct inode *inode, loff_t i_pos)
+{
+	struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
+	struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos);
+
+	spin_lock(&sbi->inode_hash_lock);
+	EXFAT_I(inode)->i_pos = i_pos;
+	hlist_add_head(&EXFAT_I(inode)->i_hash_fat, head);
+	spin_unlock(&sbi->inode_hash_lock);
+}
+
+static void exfat_detach(struct inode *inode)
+{
+	struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
+
+	spin_lock(&sbi->inode_hash_lock);
+	hlist_del_init(&EXFAT_I(inode)->i_hash_fat);
+	EXFAT_I(inode)->i_pos = 0;
+	spin_unlock(&sbi->inode_hash_lock);
+}
+
+/* doesn't deal with root inode */
+static int exfat_fill_inode(struct inode *inode, FILE_ID_T *fid)
+{
+	struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
+	FS_INFO_T *p_fs = &(sbi->fs_info);
+	DIR_ENTRY_T info;
+
+	memcpy(&(EXFAT_I(inode)->fid), fid, sizeof(FILE_ID_T));
+
+	FsReadStat(inode, &info);
+
+	EXFAT_I(inode)->i_pos = 0;
+	EXFAT_I(inode)->target = NULL;
+	inode->i_uid = sbi->options.fs_uid;
+	inode->i_gid = sbi->options.fs_gid;
+	inode->i_version++;
+	inode->i_generation = get_seconds();
+
+	if (info.Attr & ATTR_SUBDIR) { /* directory */
+		inode->i_generation &= ~1;
+		inode->i_mode = exfat_make_mode(sbi, info.Attr, S_IRWXUGO);
+		inode->i_op = &exfat_dir_inode_operations;
+		inode->i_fop = &exfat_dir_operations;
+
+		i_size_write(inode, info.Size);
+		EXFAT_I(inode)->mmu_private = i_size_read(inode);
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,2,00)
+		set_nlink(inode, info.NumSubdirs);
+#else
+		inode->i_nlink = info.NumSubdirs;
+#endif
+	} else if (info.Attr & ATTR_SYMLINK) { /* symbolic link */
+		inode->i_generation |= 1;
+		inode->i_mode = exfat_make_mode(sbi, info.Attr, S_IRWXUGO);
+		inode->i_op = &exfat_symlink_inode_operations;
+
+		i_size_write(inode, info.Size);
+		EXFAT_I(inode)->mmu_private = i_size_read(inode);
+	} else { /* regular file */
+		inode->i_generation |= 1;
+		inode->i_mode = exfat_make_mode(sbi, info.Attr, S_IRWXUGO);
+		inode->i_op = &exfat_file_inode_operations;
+		inode->i_fop = &exfat_file_operations;
+		inode->i_mapping->a_ops = &exfat_aops;
+		inode->i_mapping->nrpages = 0;
+
+		i_size_write(inode, info.Size);
+		EXFAT_I(inode)->mmu_private = i_size_read(inode);
+	}
+	exfat_save_attr(inode, info.Attr);
+
+	inode->i_blocks = ((i_size_read(inode) + (p_fs->cluster_size - 1))
+					   & ~((loff_t)p_fs->cluster_size - 1)) >> 9;
+
+	exfat_time_fat2unix(sbi, &inode->i_mtime, &info.ModifyTimestamp);
+	exfat_time_fat2unix(sbi, &inode->i_ctime, &info.CreateTimestamp);
+	exfat_time_fat2unix(sbi, &inode->i_atime, &info.AccessTimestamp);
+
+	return 0;
+}
+
+static struct inode *exfat_build_inode(struct super_block *sb,
+									   FILE_ID_T *fid, loff_t i_pos) {
+	struct inode *inode;
+	int err;
+
+	inode = exfat_iget(sb, i_pos);
+	if (inode)
+		goto out;
+	inode = new_inode(sb);
+	if (!inode) {
+		inode = ERR_PTR(-ENOMEM);
+		goto out;
+	}
+	inode->i_ino = iunique(sb, EXFAT_ROOT_INO);
+	inode->i_version = 1;
+	err = exfat_fill_inode(inode, fid);
+	if (err) {
+		iput(inode);
+		inode = ERR_PTR(err);
+		goto out;
+	}
+	exfat_attach(inode, i_pos);
+	insert_inode_hash(inode);
+out:
+	return inode;
+}
+
+static int exfat_sync_inode(struct inode *inode)
+{
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,34)
+	return exfat_write_inode(inode, 0);
+#else
+	return exfat_write_inode(inode, NULL);
+#endif
+}
+
+static struct inode *exfat_alloc_inode(struct super_block *sb)
+{
+	struct exfat_inode_info *ei;
+
+	ei = kmem_cache_alloc(exfat_inode_cachep, GFP_NOFS);
+	if (!ei)
+		return NULL;
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,00)
+	init_rwsem(&ei->truncate_lock);
+#endif
+
+	return &ei->vfs_inode;
+}
+
+static void exfat_destroy_inode(struct inode *inode)
+{
+	if (EXFAT_I(inode)->target)
+		kfree(EXFAT_I(inode)->target);
+	EXFAT_I(inode)->target = NULL;
+
+	kmem_cache_free(exfat_inode_cachep, EXFAT_I(inode));
+}
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,34)
+static int exfat_write_inode(struct inode *inode, int wait)
+#else
+static int exfat_write_inode(struct inode *inode, struct writeback_control *wbc)
+#endif
+{
+	struct super_block *sb = inode->i_sb;
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	DIR_ENTRY_T info;
+
+	if (inode->i_ino == EXFAT_ROOT_INO)
+		return 0;
+
+	info.Attr = exfat_make_attr(inode);
+	info.Size = i_size_read(inode);
+
+	exfat_time_unix2fat(sbi, &inode->i_mtime, &info.ModifyTimestamp);
+	exfat_time_unix2fat(sbi, &inode->i_ctime, &info.CreateTimestamp);
+	exfat_time_unix2fat(sbi, &inode->i_atime, &info.AccessTimestamp);
+
+	FsWriteStat(inode, &info);
+
+	return 0;
+}
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36)
+static void exfat_delete_inode(struct inode *inode)
+{
+	truncate_inode_pages(&inode->i_data, 0);
+	clear_inode(inode);
+}
+
+static void exfat_clear_inode(struct inode *inode)
+{
+	exfat_detach(inode);
+	remove_inode_hash(inode);
+}
+#else
+static void exfat_evict_inode(struct inode *inode)
+{
+	truncate_inode_pages(&inode->i_data, 0);
+
+	if (!inode->i_nlink)
+		i_size_write(inode, 0);
+	invalidate_inode_buffers(inode);
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,4,80)
+	end_writeback(inode);
+#else
+	clear_inode(inode);
+#endif
+	exfat_detach(inode);
+
+	remove_inode_hash(inode);
+}
+#endif
+
+static void exfat_free_super(struct exfat_sb_info *sbi)
+{
+	if (sbi->nls_disk)
+		unload_nls(sbi->nls_disk);
+	if (sbi->nls_io)
+		unload_nls(sbi->nls_io);
+	if (sbi->options.iocharset != exfat_default_iocharset)
+		kfree(sbi->options.iocharset);
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,0)
+	/* mutex_init is in exfat_fill_super function. only for 3.7+ */
+	mutex_destroy(&sbi->s_lock);
+#endif
+	kfree(sbi);
+}
+
+static void exfat_put_super(struct super_block *sb)
+{
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	if (__is_sb_dirty(sb))
+		exfat_write_super(sb);
+
+	FsUmountVol(sb);
+
+	sb->s_fs_info = NULL;
+	exfat_free_super(sbi);
+}
+
+static void exfat_write_super(struct super_block *sb)
+{
+	__lock_super(sb);
+
+	__set_sb_clean(sb);
+
+	if (!(sb->s_flags & MS_RDONLY))
+		FsSyncVol(sb, 1);
+
+	__unlock_super(sb);
+}
+
+static int exfat_sync_fs(struct super_block *sb, int wait)
+{
+	int err = 0;
+
+	if (__is_sb_dirty(sb)) {
+		__lock_super(sb);
+		__set_sb_clean(sb);
+		err = FsSyncVol(sb, 1);
+		__unlock_super(sb);
+	}
+
+	return err;
+}
+
+static int exfat_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+	struct super_block *sb = dentry->d_sb;
+	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
+	FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info);
+	VOL_INFO_T info;
+
+	if (p_fs->used_clusters == (u32) ~0) {
+		if (FFS_MEDIAERR == FsGetVolInfo(sb, &info))
+			return -EIO;
+
+	} else {
+		info.FatType = p_fs->vol_type;
+		info.ClusterSize = p_fs->cluster_size;
+		info.NumClusters = p_fs->num_clusters - 2;
+		info.UsedClusters = p_fs->used_clusters;
+		info.FreeClusters = info.NumClusters - info.UsedClusters;
+
+		if (p_fs->dev_ejected)
+			printk("[EXFAT] statfs on device is ejected\n");
+	}
+
+	buf->f_type = sb->s_magic;
+	buf->f_bsize = info.ClusterSize;
+	buf->f_blocks = info.NumClusters;
+	buf->f_bfree = info.FreeClusters;
+	buf->f_bavail = info.FreeClusters;
+	buf->f_fsid.val[0] = (u32)id;
+	buf->f_fsid.val[1] = (u32)(id >> 32);
+	buf->f_namelen = 260;
+
+	return 0;
+}
+
+static int exfat_remount(struct super_block *sb, int *flags, char *data)
+{
+	*flags |= MS_NODIRATIME;
+	return 0;
+}
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,3,0)
+static int exfat_show_options(struct seq_file *m, struct dentry *root)
+{
+	struct exfat_sb_info *sbi = EXFAT_SB(root->d_sb);
+#else
+static int exfat_show_options(struct seq_file *m, struct vfsmount *mnt)
+{
+	struct exfat_sb_info *sbi = EXFAT_SB(mnt->mnt_sb);
+#endif
+	struct exfat_mount_options *opts = &sbi->options;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,5,0)
+	if (__kuid_val(opts->fs_uid))
+		seq_printf(m, ",uid=%u", __kuid_val(opts->fs_uid));
+	if (__kgid_val(opts->fs_gid))
+		seq_printf(m, ",gid=%u", __kgid_val(opts->fs_gid));
+#else
+	if (opts->fs_uid != 0)
+		seq_printf(m, ",uid=%u", opts->fs_uid);
+	if (opts->fs_gid != 0)
+		seq_printf(m, ",gid=%u", opts->fs_gid);
+#endif
+	seq_printf(m, ",fmask=%04o", opts->fs_fmask);
+	seq_printf(m, ",dmask=%04o", opts->fs_dmask);
+	if (opts->allow_utime)
+		seq_printf(m, ",allow_utime=%04o", opts->allow_utime);
+	if (sbi->nls_disk)
+		seq_printf(m, ",codepage=%s", sbi->nls_disk->charset);
+	if (sbi->nls_io)
+		seq_printf(m, ",iocharset=%s", sbi->nls_io->charset);
+	seq_printf(m, ",namecase=%u", opts->casesensitive);
+	if (opts->errors == EXFAT_ERRORS_CONT)
+		seq_puts(m, ",errors=continue");
+	else if (opts->errors == EXFAT_ERRORS_PANIC)
+		seq_puts(m, ",errors=panic");
+	else
+		seq_puts(m, ",errors=remount-ro");
+#ifdef CONFIG_EXFAT_DISCARD
+	if (opts->discard)
+		seq_printf(m, ",discard");
+#endif
+	return 0;
+}
+
+const struct super_operations exfat_sops = {
+	.alloc_inode   = exfat_alloc_inode,
+	.destroy_inode = exfat_destroy_inode,
+	.write_inode   = exfat_write_inode,
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36)
+	.delete_inode  = exfat_delete_inode,
+	.clear_inode   = exfat_clear_inode,
+#else
+	.evict_inode  = exfat_evict_inode,
+#endif
+	.put_super     = exfat_put_super,
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,7,0)
+	.write_super   = exfat_write_super,
+#endif
+	.sync_fs       = exfat_sync_fs,
+	.statfs        = exfat_statfs,
+	.remount_fs    = exfat_remount,
+	.show_options  = exfat_show_options,
+};
+
+/*======================================================================*/
+/*  Super Block Read Operations                                         */
+/*======================================================================*/
+
+enum {
+	Opt_uid,
+	Opt_gid,
+	Opt_umask,
+	Opt_dmask,
+	Opt_fmask,
+	Opt_allow_utime,
+	Opt_codepage,
+	Opt_charset,
+	Opt_namecase,
+	Opt_debug,
+	Opt_err_cont,
+	Opt_err_panic,
+	Opt_err_ro,
+	Opt_utf8_hack,
+	Opt_err,
+#ifdef CONFIG_EXFAT_DISCARD
+	Opt_discard,
+#endif /* EXFAT_CONFIG_DISCARD */
+};
+
+static const match_table_t exfat_tokens = {
+	{Opt_uid, "uid=%u"},
+	{Opt_gid, "gid=%u"},
+	{Opt_umask, "umask=%o"},
+	{Opt_dmask, "dmask=%o"},
+	{Opt_fmask, "fmask=%o"},
+	{Opt_allow_utime, "allow_utime=%o"},
+	{Opt_codepage, "codepage=%u"},
+	{Opt_charset, "iocharset=%s"},
+	{Opt_namecase, "namecase=%u"},
+	{Opt_debug, "debug"},
+	{Opt_err_cont, "errors=continue"},
+	{Opt_err_panic, "errors=panic"},
+	{Opt_err_ro, "errors=remount-ro"},
+	{Opt_utf8_hack, "utf8"},
+#ifdef CONFIG_EXFAT_DISCARD
+	{Opt_discard, "discard"},
+#endif /* CONFIG_EXFAT_DISCARD */
+	{Opt_err, NULL}
+};
+
+static int parse_options(char *options, int silent, int *debug,
+						 struct exfat_mount_options *opts)
+{
+	char *p;
+	substring_t args[MAX_OPT_ARGS];
+	int option;
+	char *iocharset;
+
+	opts->fs_uid = current_uid();
+	opts->fs_gid = current_gid();
+	opts->fs_fmask = opts->fs_dmask = current->fs->umask;
+	opts->allow_utime = (unsigned short) -1;
+	opts->codepage = exfat_default_codepage;
+	opts->iocharset = exfat_default_iocharset;
+	opts->casesensitive = 0;
+	opts->errors = EXFAT_ERRORS_RO;
+#ifdef CONFIG_EXFAT_DISCARD
+	opts->discard = 0;
+#endif
+	*debug = 0;
+
+	if (!options)
+		goto out;
+
+	while ((p = strsep(&options, ",")) != NULL) {
+		int token;
+		if (!*p)
+			continue;
+
+		token = match_token(p, exfat_tokens, args);
+		switch (token) {
+		case Opt_uid:
+			if (match_int(&args[0], &option))
+				return 0;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,5,0)
+			opts->fs_uid = KUIDT_INIT(option);
+#else
+			opts->fs_uid = option;
+#endif
+			break;
+		case Opt_gid:
+			if (match_int(&args[0], &option))
+				return 0;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,5,0)
+			opts->fs_gid = KGIDT_INIT(option);
+#else
+			opts->fs_gid = option;
+#endif
+			break;
+		case Opt_umask:
+		case Opt_dmask:
+		case Opt_fmask:
+			if (match_octal(&args[0], &option))
+				return 0;
+			if (token != Opt_dmask)
+				opts->fs_fmask = option;
+			if (token != Opt_fmask)
+				opts->fs_dmask = option;
+			break;
+		case Opt_allow_utime:
+			if (match_octal(&args[0], &option))
+				return 0;
+			opts->allow_utime = option & (S_IWGRP | S_IWOTH);
+			break;
+		case Opt_codepage:
+			if (match_int(&args[0], &option))
+				return 0;
+			opts->codepage = option;
+			break;
+		case Opt_charset:
+			if (opts->iocharset != exfat_default_iocharset)
+				kfree(opts->iocharset);
+			iocharset = match_strdup(&args[0]);
+			if (!iocharset)
+				return -ENOMEM;
+			opts->iocharset = iocharset;
+			break;
+		case Opt_namecase:
+			if (match_int(&args[0], &option))
+				return 0;
+			opts->casesensitive = option;
+			break;
+		case Opt_err_cont:
+			opts->errors = EXFAT_ERRORS_CONT;
+			break;
+		case Opt_err_panic:
+			opts->errors = EXFAT_ERRORS_PANIC;
+			break;
+		case Opt_err_ro:
+			opts->errors = EXFAT_ERRORS_RO;
+			break;
+		case Opt_debug:
+			*debug = 1;
+			break;
+#ifdef CONFIG_EXFAT_DISCARD
+		case Opt_discard:
+			opts->discard = 1;
+			break;
+#endif /* CONFIG_EXFAT_DISCARD */
+		case Opt_utf8_hack:
+			break;
+		default:
+			if (!silent)
+				printk(KERN_ERR "[EXFAT] Unrecognized mount option %s or missing value\n", p);
+			return -EINVAL;
+		}
+	}
+
+out:
+	if (opts->allow_utime == (unsigned short) -1)
+		opts->allow_utime = ~opts->fs_dmask & (S_IWGRP | S_IWOTH);
+
+	return 0;
+}
+
+static void exfat_hash_init(struct super_block *sb)
+{
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	int i;
+
+	spin_lock_init(&sbi->inode_hash_lock);
+	for (i = 0; i < EXFAT_HASH_SIZE; i++)
+		INIT_HLIST_HEAD(&sbi->inode_hashtable[i]);
+}
+
+static int exfat_read_root(struct inode *inode)
+{
+	struct super_block *sb = inode->i_sb;
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	struct timespec ts;
+	FS_INFO_T *p_fs = &(sbi->fs_info);
+	DIR_ENTRY_T info;
+
+	ts = CURRENT_TIME_SEC;
+
+	EXFAT_I(inode)->fid.dir.dir = p_fs->root_dir;
+	EXFAT_I(inode)->fid.dir.flags = 0x01;
+	EXFAT_I(inode)->fid.entry = -1;
+	EXFAT_I(inode)->fid.start_clu = p_fs->root_dir;
+	EXFAT_I(inode)->fid.flags = 0x01;
+	EXFAT_I(inode)->fid.type = TYPE_DIR;
+	EXFAT_I(inode)->fid.rwoffset = 0;
+	EXFAT_I(inode)->fid.hint_last_off = -1;
+
+	EXFAT_I(inode)->target = NULL;
+
+	FsReadStat(inode, &info);
+
+	inode->i_uid = sbi->options.fs_uid;
+	inode->i_gid = sbi->options.fs_gid;
+	inode->i_version++;
+	inode->i_generation = 0;
+	inode->i_mode = exfat_make_mode(sbi, ATTR_SUBDIR, S_IRWXUGO);
+	inode->i_op = &exfat_dir_inode_operations;
+	inode->i_fop = &exfat_dir_operations;
+
+	i_size_write(inode, info.Size);
+	inode->i_blocks = ((i_size_read(inode) + (p_fs->cluster_size - 1))
+					   & ~((loff_t)p_fs->cluster_size - 1)) >> 9;
+	EXFAT_I(inode)->i_pos = ((loff_t) p_fs->root_dir << 32) | 0xffffffff;
+	EXFAT_I(inode)->mmu_private = i_size_read(inode);
+
+	exfat_save_attr(inode, ATTR_SUBDIR);
+	inode->i_mtime = inode->i_atime = inode->i_ctime = ts;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,2,00)
+	set_nlink(inode, info.NumSubdirs + 2);
+#else
+	inode->i_nlink = info.NumSubdirs + 2;
+#endif
+
+	return 0;
+}
+
+#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,37)
+static void setup_dops(struct super_block *sb)
+{
+	if (EXFAT_SB(sb)->options.casesensitive == 0)
+		sb->s_d_op = &exfat_ci_dentry_ops;
+	else
+		sb->s_d_op = &exfat_dentry_ops;
+}
+#endif
+
+static int exfat_fill_super(struct super_block *sb, void *data, int silent)
+{
+	struct inode *root_inode = NULL;
+	struct exfat_sb_info *sbi;
+	int debug, ret;
+	long error;
+	char buf[50];
+
+	/*
+	 * GFP_KERNEL is ok here, because while we do hold the
+	 * supeblock lock, memory pressure can't call back into
+	 * the filesystem, since we're only just about to mount
+	 * it and have no inodes etc active!
+	 */
+	sbi = kzalloc(sizeof(struct exfat_sb_info), GFP_KERNEL);
+	if (!sbi)
+		return -ENOMEM;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,0)
+	mutex_init(&sbi->s_lock);
+#endif
+	sb->s_fs_info = sbi;
+	sb->s_flags |= MS_NODIRATIME;
+	sb->s_magic = EXFAT_SUPER_MAGIC;
+	sb->s_op = &exfat_sops;
+
+	error = parse_options(data, silent, &debug, &sbi->options);
+	if (error)
+		goto out_fail;
+
+#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,37)
+	setup_dops(sb);
+#endif
+
+	error = -EIO;
+	sb_min_blocksize(sb, 512);
+	sb->s_maxbytes = 0x7fffffffffffffffLL;    /* maximum file size */
+
+	ret = FsMountVol(sb);
+	if (ret) {
+		if (!silent)
+			printk(KERN_ERR "[EXFAT] FsMountVol failed\n");
+
+		goto out_fail;
+	}
+
+	/* set up enough so that it can read an inode */
+	exfat_hash_init(sb);
+
+	/*
+	 * The low byte of FAT's first entry must have same value with
+	 * media-field.  But in real world, too many devices is
+	 * writing wrong value.  So, removed that validity check.
+	 *
+	 * if (FAT_FIRST_ENT(sb, media) != first)
+	 */
+
+	/* codepage is not meaningful in exfat */
+	if (sbi->fs_info.vol_type != EXFAT) {
+		error = -EINVAL;
+		sprintf(buf, "cp%d", sbi->options.codepage);
+		sbi->nls_disk = load_nls(buf);
+		if (!sbi->nls_disk) {
+			printk(KERN_ERR "[EXFAT] Codepage %s not found\n", buf);
+			goto out_fail2;
+		}
+	}
+
+	sbi->nls_io = load_nls(sbi->options.iocharset);
+
+	error = -ENOMEM;
+	root_inode = new_inode(sb);
+	if (!root_inode)
+		goto out_fail2;
+	root_inode->i_ino = EXFAT_ROOT_INO;
+	root_inode->i_version = 1;
+	error = exfat_read_root(root_inode);
+	if (error < 0)
+		goto out_fail2;
+	error = -ENOMEM;
+	exfat_attach(root_inode, EXFAT_I(root_inode)->i_pos);
+	insert_inode_hash(root_inode);
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,00)
+	sb->s_root = d_make_root(root_inode);
+#else
+	sb->s_root = d_alloc_root(root_inode);
+#endif
+	if (!sb->s_root) {
+		printk(KERN_ERR "[EXFAT] Getting the root inode failed\n");
+		goto out_fail2;
+	}
+
+	return 0;
+
+out_fail2:
+	FsUmountVol(sb);
+out_fail:
+	if (root_inode)
+		iput(root_inode);
+	sb->s_fs_info = NULL;
+	exfat_free_super(sbi);
+	return error;
+}
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37)
+static int exfat_get_sb(struct file_system_type *fs_type,
+						int flags, const char *dev_name,
+						void *data, struct vfsmount *mnt)
+{
+	return get_sb_bdev(fs_type, flags, dev_name, data, exfat_fill_super, mnt);
+}
+#else
+static struct dentry *exfat_fs_mount(struct file_system_type *fs_type,
+									 int flags, const char *dev_name,
+									 void *data) {
+	return mount_bdev(fs_type, flags, dev_name, data, exfat_fill_super);
+}
+#endif
+
+static void init_once(void *foo)
+{
+	struct exfat_inode_info *ei = (struct exfat_inode_info *)foo;
+
+	INIT_HLIST_NODE(&ei->i_hash_fat);
+	inode_init_once(&ei->vfs_inode);
+}
+
+static int __init exfat_init_inodecache(void)
+{
+	exfat_inode_cachep = kmem_cache_create("exfat_inode_cache",
+										   sizeof(struct exfat_inode_info),
+										   0, (SLAB_RECLAIM_ACCOUNT|
+												   SLAB_MEM_SPREAD),
+										   init_once);
+	if (exfat_inode_cachep == NULL)
+		return -ENOMEM;
+	return 0;
+}
+
+static void __exit exfat_destroy_inodecache(void)
+{
+	kmem_cache_destroy(exfat_inode_cachep);
+}
+
+#ifdef CONFIG_EXFAT_KERNEL_DEBUG
+static void exfat_debug_kill_sb(struct super_block *sb)
+{
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	struct block_device *bdev = sb->s_bdev;
+
+	long flags;
+
+	if (sbi) {
+		flags = sbi->debug_flags;
+
+		if (flags & EXFAT_DEBUGFLAGS_INVALID_UMOUNT) {
+			/* invalidate_bdev drops all device cache include dirty.
+			   we use this to simulate device removal */
+			FsReleaseCache(sb);
+			invalidate_bdev(bdev);
+		}
+	}
+
+	kill_block_super(sb);
+}
+#endif /* CONFIG_EXFAT_KERNEL_DEBUG */
+
+static struct file_system_type exfat_fs_type = {
+	.owner       = THIS_MODULE,
+#if defined(CONFIG_MACH_LGE) || defined(CONFIG_HTC_BATT_CORE)
+	.name        = "texfat",
+#else
+	.name        = "exfat",
+#endif
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37)
+	.get_sb      = exfat_get_sb,
+#else
+	.mount       = exfat_fs_mount,
+#endif
+#ifdef CONFIG_EXFAT_KERNEL_DEBUG
+	.kill_sb    = exfat_debug_kill_sb,
+#else
+	.kill_sb    = kill_block_super,
+#endif /* CONFIG_EXFAT_KERNEL_DEBUG */
+	.fs_flags    = FS_REQUIRES_DEV,
+};
+
+static int __init init_exfat(void)
+{
+	int err;
+
+	err = FsInit();
+	if (err) {
+		if (err == FFS_MEMORYERR)
+			return -ENOMEM;
+		else
+			return -EIO;
+	}
+
+	printk(KERN_INFO "exFAT: Version %s\n", EXFAT_VERSION);
+
+	err = exfat_init_inodecache();
+	if (err)
+		goto out;
+
+	err = register_filesystem(&exfat_fs_type);
+	if (err)
+		goto out;
+
+	return 0;
+out:
+	FsShutdown();
+	return err;
+}
+
+static void __exit exit_exfat(void)
+{
+	exfat_destroy_inodecache();
+	unregister_filesystem(&exfat_fs_type);
+	FsShutdown();
+}
+
+module_init(init_exfat);
+module_exit(exit_exfat);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("exFAT Filesystem Driver");
+#ifdef MODULE_ALIAS_FS
+#if defined(CONFIG_MACH_LGE) || defined(CONFIG_HTC_BATT_CORE)
+MODULE_ALIAS_FS("texfat");
+#else
+MODULE_ALIAS_FS("exfat");
+#endif
+#endif