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exfat_super.c
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exfat_super.c
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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
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 16, 0)
#include <linux/iversion.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
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 16, 0)
#define USE_NEW_IVERSION_API
#define INC_IVERSION(x) (inode_inc_iversion(x))
#define GET_IVERSION(x) (inode_peek_iversion_raw(x))
#define SET_IVERSION(x,y) (inode_set_iversion(x, y))
#else
#define INC_IVERSION(x) (x->i_version++)
#define GET_IVERSION(x) (x->i_version)
#define SET_IVERSION(x,y) (x->i_version = y)
#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;
}
INC_IVERSION(dir);
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;
}
INC_IVERSION(inode);
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 = GET_IVERSION(dentry->d_parent->d_inode);
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 = GET_IVERSION(dentry->d_parent->d_inode);
#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 = GET_IVERSION(dentry->d_parent->d_inode);
}
#else
dentry = d_splice_alias(inode, dentry);
if (dentry)
dentry->d_time = GET_IVERSION(dentry->d_parent->d_inode);
#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;
}
INC_IVERSION(dir);
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;
}
INC_IVERSION(dir);
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;
}
INC_IVERSION(inode);
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 = GET_IVERSION(dentry->d_parent->d_inode);
d_instantiate(dentry, inode);
out:
__unlock_super(sb);
DPRINTK("exfat_symlink exited\n");