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/* 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;
#if LINUX_VERSION_CODE < KERNEL_VERSION(4,8,0)
#define current_time(x) (CURRENT_TIME_SEC)
#endif
#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
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,8,0)
qstr->hash = full_name_hash(dentry, qstr->name, exfat_striptail_len(qstr));
#else
qstr->hash = full_name_hash(qstr->name, exfat_striptail_len(qstr));
#endif
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);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,8,0)
hash = init_name_hash(dentry);
#else
hash = init_name_hash();
#endif
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(4,8,0)
static int exfat_cmpi(const struct dentry *dentry,
unsigned int len, const char *str, const struct qstr *name)
#elif 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
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,8,0)
struct nls_table *t = EXFAT_SB(dentry->d_sb)->nls_io;
#else
struct nls_table *t = EXFAT_SB(parent->d_sb)->nls_io;
#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 (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(4,8,0)
static int exfat_cmp(const struct dentry *dentry,
unsigned int len, const char *str, const struct qstr *name)
#elif 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;
FILE_ID_T fid;
loff_t i_pos;
int err;
__lock_super(sb);
DPRINTK("exfat_create entered\n");
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 = current_time(dir);
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 = current_time(inode);
/* 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) {
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;
int err;
__lock_super(sb);
DPRINTK("exfat_unlink entered\n");
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 = current_time(dir);
if (IS_DIRSYNC(dir))
(void) exfat_sync_inode(dir);
else
mark_inode_dirty(dir);
clear_nlink(inode);
inode->i_mtime = inode->i_atime = current_time(inode);
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;
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");
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 = current_time(dir);
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 = current_time(inode);
/* 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;
FILE_ID_T fid;
loff_t i_pos;
int err;
__lock_super(sb);
DPRINTK("exfat_mkdir entered\n");
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 = current_time(dir);
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 = current_time(inode);
/* 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;
int err;
__lock_super(sb);
DPRINTK("exfat_rmdir entered\n");
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 = current_time(dir);
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 = current_time(inode);
exfat_detach(inode);
remove_inode_hash(inode);
out:
__unlock_super(sb);
DPRINTK("exfat_rmdir exited\n");
return err;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,9,0)
static int exfat_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry,
unsigned int flags)
#else
static int exfat_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry)
#endif
{
struct inode *old_inode, *new_inode;
struct super_block *sb = old_dir->i_sb;
loff_t i_pos;
int err;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,9,0)
if (flags)
return -EINVAL;
#endif
__lock_super(sb);
DPRINTK("exfat_rename entered\n");
old_inode = old_dentry->d_inode;
new_inode = new_dentry->d_inode;
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 = current_time(new_dir);
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 = current_time(old_dir);
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 = current_time(new_inode);
}
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(inode);
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);
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,9,0)
error = setattr_prepare(dentry, attr);
#else
error = inode_change_ok(inode, attr);
#endif
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;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
static int exfat_getattr(const struct path *path, struct kstat *stat,
u32 request_mask, unsigned int flags)
{
struct inode *inode = path->dentry->d_inode;
#else
static int exfat_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
{
struct inode *inode = dentry->d_inode;
#endif
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(4,5,0)
static const char *exfat_get_link(struct dentry *dentry, struct inode *inode, struct delayed_call *done)
{
struct exfat_inode_info *ei = EXFAT_I(inode);
if (ei->target != NULL) {
char *cookie = ei->target;
if (cookie != NULL) {
return (char *)(ei->target);
}
}
return NULL;
}
#elif 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 = {
#if LINUX_VERSION_CODE < KERNEL_VERSION(4,10,0)
.readlink = generic_readlink,
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(4,5,0)
.follow_link = exfat_follow_link,
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,5,0)
.get_link = exfat_get_link,
#endif
};
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(inode);
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(inode);
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)
#elif LINUX_VERSION_CODE < KERNEL_VERSION(4,7,0)
static ssize_t exfat_direct_IO(struct kiocb *iocb,
struct iov_iter *iter, loff_t offset)
#else /* >= 4.7.x */
static ssize_t exfat_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
#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
#elif LINUX_VERSION_CODE < KERNEL_VERSION(4,7,0)
if (EXFAT_I(inode)->mmu_private < (offset + iov_iter_count(iter)))
#else
if (EXFAT_I(inode)->mmu_private < iov_iter_count(iter))
#endif
return 0;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,7,0)
ret = blockdev_direct_IO(iocb, inode, iter, exfat_get_block);
#elif 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(4,7,0)
if ((ret < 0) && (rw & WRITE))
exfat_write_failed(mapping, iov_iter_count(iter));
#elif 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(3,5,0)
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,
};
/*======================================================================*/
/* Export Operations */
/*======================================================================*/
static struct inode *exfat_nfs_get_inode(struct super_block *sb,
u64 ino, u32 generation)
{
struct inode *inode = NULL;
if (ino < EXFAT_ROOT_INO)
return inode;
inode = ilookup(sb, ino);
if (inode && generation && (inode->i_generation != generation)) {
iput(inode);
inode = NULL;
}
return inode;
}
static struct dentry *exfat_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,
exfat_nfs_get_inode);
}
static struct dentry *exfat_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,
exfat_nfs_get_inode);
}
const struct export_operations exfat_export_ops = {
.fh_to_dentry = exfat_fh_to_dentry,
.fh_to_parent = exfat_fh_to_parent,
};
/*======================================================================*/
/* 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);
FS_INFO_T *p_fs = &(sbi->fs_info);
DIR_ENTRY_T info;
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 = current_time(inode);
#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;
sb->s_export_op = &exfat_export_ops;
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)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,6,0)
/*
* Make sure all delayed rcu free inodes are flushed before we
* destroy cache.
*/
rcu_barrier();
#endif
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