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super.c
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/*
* 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, see <http://www.gnu.org/licenses/>.
*/
/************************************************************************/
/* */
/* PROJECT : exFAT & FAT12/16/32 File System */
/* FILE : core.c */
/* PURPOSE : exFAT glue layer for supporting VFS */
/* */
/*----------------------------------------------------------------------*/
/* NOTES */
/* */
/* */
/************************************************************************/
#include <linux/version.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/time.h>
#include <linux/slab.h>
#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>
#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 <linux/bio.h>
#include <linux/blkdev.h>
#include <linux/swap.h> /* for mark_page_accessed() */
#include <linux/vmalloc.h>
#include <asm/current.h>
#include <asm/unaligned.h>
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 10, 0)
#include <linux/aio.h>
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 0, 0)
#error EXFAT only supports linux kernel version 3.0 or higher
#endif
#include "exfat.h"
#include "version.h"
/* skip iterating emit_dots when dir is empty */
#define ITER_POS_FILLED_DOTS (2)
static struct kset *exfat_kset;
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;
static const char exfat_iocharset_with_utf8[] = "iso8859-1";
#ifdef CONFIG_EXFAT_TRACE_SB_LOCK
static unsigned long __lock_jiffies;
#endif
static void exfat_truncate(struct inode *inode, loff_t old_size);
static int exfat_get_block(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create);
static struct inode *exfat_iget(struct super_block *sb, loff_t i_pos);
static struct inode *exfat_build_inode(struct super_block *sb, const 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);
static int __exfat_write_inode(struct inode *inode, int sync);
static int exfat_sync_inode(struct inode *inode);
static int exfat_write_inode(struct inode *inode, struct writeback_control *wbc);
static void exfat_write_super(struct super_block *sb);
static void exfat_write_failed(struct address_space *mapping, loff_t to);
static void exfat_init_namebuf(DENTRY_NAMEBUF_T *nb);
static int exfat_alloc_namebuf(DENTRY_NAMEBUF_T *nb);
static void exfat_free_namebuf(DENTRY_NAMEBUF_T *nb);
/*************************************************************************
* INNER FUNCTIONS FOR FUNCTIONS WHICH HAS KERNEL VERSION DEPENDENCY
*************************************************************************/
static int __exfat_getattr(struct inode *inode, struct kstat *stat);
static void __exfat_writepage_end_io(struct bio *bio, int err);
static inline void __lock_super(struct super_block *sb);
static inline void __unlock_super(struct super_block *sb);
static int __exfat_create(struct inode *dir, struct dentry *dentry);
static int __exfat_revalidate(struct dentry *dentry);
static int __exfat_revalidate_ci(struct dentry *dentry, unsigned int flags);
static int __exfat_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync);
static struct dentry *__exfat_lookup(struct inode *dir, struct dentry *dentry);
static int __exfat_mkdir(struct inode *dir, struct dentry *dentry);
static int __exfat_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry);
static int __exfat_show_options(struct seq_file *m, struct super_block *sb);
static inline ssize_t __exfat_blkdev_direct_IO(int rw, struct kiocb *iocb,
struct inode *inode, void *iov_u, loff_t offset,
unsigned long nr_segs);
static inline ssize_t __exfat_direct_IO(int rw, struct kiocb *iocb,
struct inode *inode, void *iov_u, loff_t offset,
loff_t count, unsigned long nr_segs);
static int __exfat_d_hash(const struct dentry *dentry, struct qstr *qstr);
static int __exfat_d_hashi(const struct dentry *dentry, struct qstr *qstr);
static int __exfat_cmp(const struct dentry *dentry, unsigned int len,
const char *str, const struct qstr *name);
static int __exfat_cmpi(const struct dentry *dentry, unsigned int len,
const char *str, const struct qstr *name);
/*************************************************************************
* FUNCTIONS WHICH HAS KERNEL VERSION DEPENDENCY
*************************************************************************/
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 14, 0)
/* EMPTY */
#else /* LINUX_VERSION_CODE < KERNEL_VERSION(4, 14, 0) */
static inline void bio_set_dev(struct bio *bio, struct block_device *bdev)
{
bio->bi_bdev = bdev;
}
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(4,9,0)
#define current_time(x) CURRENT_TIME_SEC
#endif
#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 query_flags)
{
struct inode *inode = d_backing_inode(path->dentry);
return __exfat_getattr(inode, stat);
}
#else /* LINUX_VERSION_CODE < KERNEL_VERSION(4, 11, 0) */
static int exfat_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
{
struct inode *inode = dentry->d_inode;
return __exfat_getattr(inode, stat);
}
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 10, 0)
static inline void __exfat_clean_bdev_aliases(struct block_device *bdev, sector_t block)
{
clean_bdev_aliases(bdev, block, 1);
}
#else /* LINUX_VERSION_CODE < KERNEL_VERSION(4,10,0) */
static inline void __exfat_clean_bdev_aliases(struct block_device *bdev, sector_t block)
{
unmap_underlying_metadata(bdev, block);
}
#endif
#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)
{
/*
* The VFS already checks for existence, so for local filesystems
* the RENAME_NOREPLACE implementation is equivalent to plain rename.
* Don't support any other flags
*/
if (flags & ~RENAME_NOREPLACE)
return -EINVAL;
return __exfat_rename(old_dir, old_dentry, new_dir, new_dentry);
}
#else /* 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)
{
return __exfat_rename(old_dir, old_dentry, new_dir, new_dentry);
}
static int setattr_prepare(struct dentry *dentry, struct iattr *attr)
{
struct inode *inode = dentry->d_inode;
return inode_change_ok(inode, attr);
}
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 8, 0)
static inline void __exfat_submit_bio_write(struct bio *bio)
{
bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
submit_bio(bio);
}
static inline unsigned int __exfat_full_name_hash(const struct dentry *dentry, const char *name, unsigned int len)
{
return full_name_hash(dentry, name, len);
}
static inline unsigned long __exfat_init_name_hash(const struct dentry *dentry)
{
return init_name_hash(dentry);
}
#else /* LINUX_VERSION_CODE < KERNEL_VERSION(4, 8, 0) */
static inline void __exfat_submit_bio_write(struct bio *bio)
{
submit_bio(WRITE, bio);
}
static inline unsigned int __exfat_full_name_hash(const struct dentry *unused, const char *name, unsigned int len)
{
return full_name_hash(name, len);
}
static inline unsigned long __exfat_init_name_hash(const struct dentry *unused)
{
return init_name_hash();
}
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 4, 21)
/* EMPTY */
#else /* LINUX_VERSION_CODE < KERNEL_VERSION(4, 4, 21) */
static inline void inode_lock(struct inode *inode)
{
mutex_lock(&inode->i_mutex);
}
static inline void inode_unlock(struct inode *inode)
{
mutex_unlock(&inode->i_mutex);
}
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 16, 0)
static inline int exfat_remount_syncfs(struct super_block *sb)
{
sync_filesystem(sb);
return 0;
}
#else /* LINUX_VERSION_CODE < KERNEL_VERSION(3, 16, 0) */
static inline int exfat_remount_syncfs(struct super_block *sb)
{
/*
* We don`t need to call sync_filesystem(sb),
* Because VFS calls it.
*/
return 0;
}
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 14, 0)
static inline sector_t __exfat_bio_sector(struct bio *bio)
{
return bio->bi_iter.bi_sector;
}
static inline void __exfat_set_bio_iterate(struct bio *bio, sector_t sector,
unsigned int size, unsigned int idx, unsigned int done)
{
struct bvec_iter *iter = &(bio->bi_iter);
iter->bi_sector = sector;
iter->bi_size = size;
iter->bi_idx = idx;
iter->bi_bvec_done = done;
}
static void __exfat_truncate_pagecache(struct inode *inode,
loff_t to, loff_t newsize)
{
truncate_pagecache(inode, newsize);
}
static int exfat_d_hash(const struct dentry *dentry, struct qstr *qstr)
{
return __exfat_d_hash(dentry, qstr);
}
static int exfat_d_hashi(const struct dentry *dentry, struct qstr *qstr)
{
return __exfat_d_hashi(dentry, qstr);
}
//instead of exfat_readdir
static int exfat_iterate(struct file *filp, struct dir_context *ctx)
{
struct inode *inode = filp->f_path.dentry->d_inode;
struct super_block *sb = inode->i_sb;
DIR_ENTRY_T de;
DENTRY_NAMEBUF_T *nb = &(de.NameBuf);
unsigned long inum;
loff_t cpos;
int err = 0, fake_offset = 0;
exfat_init_namebuf(nb);
__lock_super(sb);
cpos = ctx->pos;
if (!dir_emit_dots(filp, ctx))
goto out;
if (ctx->pos == ITER_POS_FILLED_DOTS) {
cpos = 0;
fake_offset = 1;
}
if (cpos & (DENTRY_SIZE - 1)) {
err = -ENOENT;
goto out;
}
/* name buffer should be allocated before use */
err = exfat_alloc_namebuf(nb);
if (err)
goto out;
get_new:
EXFAT_I(inode)->fid.size = i_size_read(inode);
EXFAT_I(inode)->fid.rwoffset = cpos >> DENTRY_SIZE_BITS;
if (cpos >= EXFAT_I(inode)->fid.size)
goto end_of_dir;
err = fsapi_readdir(inode, &de);
if (err) {
// at least we tried to read a sector
// move cpos to next sector position (should be aligned)
if (err == -EIO) {
cpos += 1 << (sb->s_blocksize_bits);
cpos &= ~((u32)sb->s_blocksize-1);
}
err = -EIO;
goto end_of_dir;
}
cpos = EXFAT_I(inode)->fid.rwoffset << DENTRY_SIZE_BITS;
if (!nb->lfn[0])
goto end_of_dir;
if (!memcmp(nb->sfn, DOS_CUR_DIR_NAME, DOS_NAME_LENGTH)) {
inum = inode->i_ino;
} else if (!memcmp(nb->sfn, 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);
}
}
/* Before calling dir_emit(), sb_lock should be released.
* Because page fault can occur in dir_emit() when the size of buffer given
* from user is larger than one page size
*/
__unlock_super(sb);
if (!dir_emit(ctx, nb->lfn, strlen(nb->lfn), inum,
(de.Attr & ATTR_SUBDIR) ? DT_DIR : DT_REG))
goto out_unlocked;
__lock_super(sb);
ctx->pos = cpos;
goto get_new;
end_of_dir:
if (!cpos && fake_offset)
cpos = ITER_POS_FILLED_DOTS;
ctx->pos = cpos;
out:
__unlock_super(sb);
out_unlocked:
/*
* To improve performance, free namebuf after unlock sb_lock.
* If namebuf is not allocated, this function do nothing
*/
exfat_free_namebuf(nb);
return err;
}
#else /* LINUX_VERSION_CODE < KERNEL_VERSION(3, 14, 0) */
static inline sector_t __exfat_bio_sector(struct bio *bio)
{
return bio->bi_sector;
}
static inline void __exfat_set_bio_iterate(struct bio *bio, sector_t sector,
unsigned int size, unsigned int idx, unsigned int done)
{
bio->bi_sector = sector;
bio->bi_idx = idx;
bio->bi_size = size; //PAGE_SIZE;
}
static void __exfat_truncate_pagecache(struct inode *inode,
loff_t to, loff_t newsize)
{
truncate_pagecache(inode, to, newsize);
}
static int exfat_d_hash(const struct dentry *dentry,
const struct inode *inode, struct qstr *qstr)
{
return __exfat_d_hash(dentry, qstr);
}
static int exfat_d_hashi(const struct dentry *dentry,
const struct inode *inode, struct qstr *qstr)
{
return __exfat_d_hashi(dentry, qstr);
}
static int exfat_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
struct inode *inode = filp->f_path.dentry->d_inode;
struct super_block *sb = inode->i_sb;
struct exfat_sb_info *sbi = EXFAT_SB(sb);
FS_INFO_T *fsi = &(sbi->fsi);
DIR_ENTRY_T de;
DENTRY_NAMEBUF_T *nb = &(de.NameBuf);
unsigned long inum;
loff_t cpos;
int err = 0, fake_offset = 0;
exfat_init_namebuf(nb);
__lock_super(sb);
cpos = filp->f_pos;
/* Fake . and .. for the root directory. */
while (cpos < ITER_POS_FILLED_DOTS) {
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 (filldir(dirent, "..", cpos+1, cpos, inum, DT_DIR) < 0)
goto out;
cpos++;
filp->f_pos++;
}
if (cpos == ITER_POS_FILLED_DOTS) {
cpos = 0;
fake_offset = 1;
}
if (cpos & (DENTRY_SIZE - 1)) {
err = -ENOENT;
goto out;
}
/* name buffer should be allocated before use */
err = exfat_alloc_namebuf(nb);
if (err)
goto out;
get_new:
EXFAT_I(inode)->fid.size = i_size_read(inode);
EXFAT_I(inode)->fid.rwoffset = cpos >> DENTRY_SIZE_BITS;
if (cpos >= EXFAT_I(inode)->fid.size)
goto end_of_dir;
err = fsapi_readdir(inode, &de);
if (err) {
// at least we tried to read a sector
// move cpos to next sector position (should be aligned)
if (err == -EIO) {
cpos += 1 << (sb->s_blocksize_bits);
cpos &= ~((u32)sb->s_blocksize-1);
}
err = -EIO;
goto end_of_dir;
}
cpos = EXFAT_I(inode)->fid.rwoffset << DENTRY_SIZE_BITS;
if (!nb->lfn[0])
goto end_of_dir;
if (!memcmp(nb->sfn, DOS_CUR_DIR_NAME, DOS_NAME_LENGTH)) {
inum = inode->i_ino;
} else if (!memcmp(nb->sfn, 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);
}
}
/* Before calling dir_emit(), sb_lock should be released.
* Because page fault can occur in dir_emit() when the size of buffer given
* from user is larger than one page size
*/
__unlock_super(sb);
if (filldir(dirent, nb->lfn, strlen(nb->lfn), cpos, inum,
(de.Attr & ATTR_SUBDIR) ? DT_DIR : DT_REG) < 0)
goto out_unlocked;
__lock_super(sb);
filp->f_pos = cpos;
goto get_new;
end_of_dir:
if (!cpos && fake_offset)
cpos = ITER_POS_FILLED_DOTS;
filp->f_pos = cpos;
out:
__unlock_super(sb);
out_unlocked:
/*
* To improve performance, free namebuf after unlock sb_lock.
* If namebuf is not allocated, this function do nothing
*/
exfat_free_namebuf(nb);
return err;
}
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 9, 0)
/* EMPTY */
#else /* LINUX_VERSION_CODE < KERNEL_VERSION(3, 9, 0) */
static inline struct inode *file_inode(const struct file *f)
{
return f->f_dentry->d_inode;
}
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 7, 0)
static inline int __is_sb_dirty(struct super_block *sb)
{
return EXFAT_SB(sb)->s_dirt;
}
static inline void __set_sb_clean(struct super_block *sb)
{
EXFAT_SB(sb)->s_dirt = 0;
}
/* Workqueue wrapper for exfat_write_super () */
static void __write_super_delayed(struct work_struct *work)
{
struct exfat_sb_info *sbi;
struct super_block *sb;
sbi = container_of(work, struct exfat_sb_info, write_super_work.work);
sb = sbi->host_sb;
/* XXX: Is this needed? */
if (!sb || !down_read_trylock(&sb->s_umount)) {
DMSG("%s: skip delayed work(write_super).\n", __func__);
return;
}
DMSG("%s: do delayed_work(write_super).\n", __func__);
spin_lock(&sbi->work_lock);
sbi->write_super_queued = 0;
spin_unlock(&sbi->work_lock);
exfat_write_super(sb);
up_read(&sb->s_umount);
}
static void setup_exfat_sync_super_wq(struct super_block *sb)
{
struct exfat_sb_info *sbi = EXFAT_SB(sb);
mutex_init(&sbi->s_lock);
spin_lock_init(&sbi->work_lock);
INIT_DELAYED_WORK(&sbi->write_super_work, __write_super_delayed);
sbi->host_sb = sb;
}
static inline bool __cancel_delayed_work_sync(struct exfat_sb_info *sbi)
{
return cancel_delayed_work_sync(&sbi->write_super_work);
}
static inline void lock_super(struct super_block *sb)
{
struct exfat_sb_info *sbi = EXFAT_SB(sb);
mutex_lock(&sbi->s_lock);
}
static inline void unlock_super(struct super_block *sb)
{
struct exfat_sb_info *sbi = EXFAT_SB(sb);
mutex_unlock(&sbi->s_lock);
}
static int exfat_revalidate(struct dentry *dentry, unsigned int flags)
{
if (flags & LOOKUP_RCU)
return -ECHILD;
return __exfat_revalidate(dentry);
}
static int exfat_revalidate_ci(struct dentry *dentry, unsigned int flags)
{
if (flags & LOOKUP_RCU)
return -ECHILD;
return __exfat_revalidate_ci(dentry, flags);
}
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;
spin_lock(&sbi->inode_hash_lock);
hlist_for_each_entry(info, head, i_hash_fat) {
BUG_ON(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;
}
#else /* LINUX_VERSION_CODE < KERNEL_VERSION(3, 7, 0) */
static inline int __is_sb_dirty(struct super_block *sb)
{
return sb->s_dirt;
}
static inline void __set_sb_clean(struct super_block *sb)
{
sb->s_dirt = 0;
}
static void setup_exfat_sync_super_wq(struct super_block *sb)
{
struct exfat_sb_info *sbi = EXFAT_SB(sb);
sbi->host_sb = sb;
}
static inline bool __cancel_delayed_work_sync(struct exfat_sb_info *sbi)
{
/* DO NOTHING */
return 0;
}
static inline void clear_inode(struct inode *inode)
{
end_writeback(inode);
}
static int exfat_revalidate(struct dentry *dentry, struct nameidata *nd)
{
if (nd && nd->flags & LOOKUP_RCU)
return -ECHILD;
return __exfat_revalidate(dentry);
}
static int exfat_revalidate_ci(struct dentry *dentry, struct nameidata *nd)
{
if (nd && nd->flags & LOOKUP_RCU)
return -ECHILD;
return __exfat_revalidate_ci(dentry, nd ? nd->flags : 0);
}
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_node *node;
struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos);
struct inode *inode = NULL;
spin_lock(&sbi->inode_hash_lock);
hlist_for_each_entry(info, node, head, i_hash_fat) {
BUG_ON(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;
}
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 6, 0)
static struct dentry *exfat_lookup(struct inode *dir, struct dentry *dentry,
unsigned int flags)
{
return __exfat_lookup(dir, dentry);
}
#else /* LINUX_VERSION_CODE < KERNEL_VERSION(3, 6, 0) */
static struct dentry *exfat_lookup(struct inode *dir, struct dentry *dentry,
struct nameidata *nd)
{
return __exfat_lookup(dir, dentry);
}
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0)
/* NOTHING NOW */
#else /* LINUX_VERSION_CODE < KERNEL_VERSION(3, 5, 0) */
#define GLOBAL_ROOT_UID (0)
#define GLOBAL_ROOT_GID (0)
static inline bool uid_eq(uid_t left, uid_t right)
{
return left == right;
}
static inline bool gid_eq(gid_t left, gid_t right)
{
return left == right;
}
static inline uid_t from_kuid_munged(struct user_namespace *to, uid_t kuid)
{
return kuid;
}
static inline gid_t from_kgid_munged(struct user_namespace *to, gid_t kgid)
{
return kgid;
}
static inline uid_t make_kuid(struct user_namespace *from, uid_t uid)
{
return uid;
}
static inline gid_t make_kgid(struct user_namespace *from, gid_t gid)
{
return gid;
}
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 4, 0)
static struct dentry *__d_make_root(struct inode *root_inode)
{
return d_make_root(root_inode);
}
static void __exfat_do_truncate(struct inode *inode, loff_t old, loff_t new)
{
down_write(&EXFAT_I(inode)->truncate_lock);
truncate_setsize(inode, new);
exfat_truncate(inode, old);
up_write(&EXFAT_I(inode)->truncate_lock);
}
static sector_t exfat_aop_bmap(struct address_space *mapping, sector_t block)
{
sector_t blocknr;
/* exfat_get_cluster() assumes the requested blocknr isn't truncated. */
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);
return blocknr;
}
static int exfat_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
{
return __exfat_mkdir(dir, dentry);
}
static int exfat_show_options(struct seq_file *m, struct dentry *root)
{
return __exfat_show_options(m, root->d_sb);
}
#else /* LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0) */
static inline void set_nlink(struct inode *inode, unsigned int nlink)
{
inode->i_nlink = nlink;
}
static struct dentry *__d_make_root(struct inode *root_inode)
{
return d_alloc_root(root_inode);
}
static void __exfat_do_truncate(struct inode *inode, loff_t old, loff_t new)
{
truncate_setsize(inode, new);
exfat_truncate(inode, old);
}
static sector_t exfat_aop_bmap(struct address_space *mapping, sector_t block)
{
sector_t blocknr;
/* exfat_get_cluster() assumes the requested blocknr isn't truncated. */
down_read(&mapping->host->i_alloc_sem);
blocknr = generic_block_bmap(mapping, block, exfat_get_block);
up_read(&mapping->host->i_alloc_sem);
return blocknr;
}
static int exfat_mkdir(struct inode *dir, struct dentry *dentry, int mode)
{
return __exfat_mkdir(dir, dentry);
}
static int exfat_show_options(struct seq_file *m, struct vfsmount *mnt)
{
return __exfat_show_options(m, mnt->mnt_sb);
}
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 1, 0)
#define __exfat_generic_file_fsync(filp, start, end, datasync) \
generic_file_fsync(filp, start, end, datasync)
static int exfat_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
{
return __exfat_file_fsync(filp, start, end, datasync);
}
#else /* LINUX_VERSION_CODE < KERNEL_VERSION(3, 1, 0) */
#define __exfat_generic_file_fsync(filp, start, end, datasync) \
generic_file_fsync(filp, datasync)
static int exfat_file_fsync(struct file *filp, int datasync)
{
return __exfat_file_fsync(filp, 0, 0, datasync);
}
#endif
/*************************************************************************
* MORE FUNCTIONS WHICH HAS KERNEL VERSION DEPENDENCY
*************************************************************************/
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 13, 0)
static void exfat_writepage_end_io(struct bio *bio)
{
__exfat_writepage_end_io(bio, blk_status_to_errno(bio->bi_status));
}
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(4, 3, 0)
static void exfat_writepage_end_io(struct bio *bio)
{
__exfat_writepage_end_io(bio, bio->bi_error);
}
#else /* LINUX_VERSION_CODE < KERNEL_VERSION(4, 3, 0) */
static void exfat_writepage_end_io(struct bio *bio, int err)
{
if (test_bit(BIO_UPTODATE, &bio->bi_flags))
err = 0;
__exfat_writepage_end_io(bio, err);
}
#endif
#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)
{
return __exfat_cmp(dentry, len, str, name);
}
static int exfat_cmpi(const struct dentry *dentry,
unsigned int len, const char *str, const struct qstr *name)
{
return __exfat_cmpi(dentry, len, str, name);
}
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3, 14, 0)
static int exfat_cmp(const struct dentry *parent, const struct dentry *dentry,
unsigned int len, const char *str, const struct qstr *name)
{
return __exfat_cmp(dentry, len, str, name);
}
static int exfat_cmpi(const struct dentry *parent, const struct dentry *dentry,
unsigned int len, const char *str, const struct qstr *name)
{
return __exfat_cmpi(dentry, len, str, name);
}
#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)
{
return __exfat_cmp(dentry, len, str, name);
}
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)
{
return __exfat_cmpi(dentry, len, str, name);
}
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 7, 0)
static ssize_t exfat_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
{
struct file *file = iocb->ki_filp;
struct address_space *mapping = file->f_mapping;
struct inode *inode = mapping->host;
size_t count = iov_iter_count(iter);
int rw = iov_iter_rw(iter);
loff_t offset = iocb->ki_pos;
return __exfat_direct_IO(rw, iocb, inode,
(void *)iter, offset, count, 0 /* UNUSED */);
}
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(4, 1, 0)
static ssize_t exfat_direct_IO(struct kiocb *iocb,
struct iov_iter *iter,
loff_t offset)
{
struct file *file = iocb->ki_filp;
struct address_space *mapping = file->f_mapping;
struct inode *inode = mapping->host;
size_t count = iov_iter_count(iter);
int rw = iov_iter_rw(iter);
return __exfat_direct_IO(rw, iocb, inode,
(void *)iter, offset, count, 0 /* UNUSED */);
}
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3, 16, 0)
static ssize_t exfat_direct_IO(int rw, struct kiocb *iocb,
struct iov_iter *iter,
loff_t offset)
{
struct file *file = iocb->ki_filp;
struct address_space *mapping = file->f_mapping;
struct inode *inode = mapping->host;
size_t count = iov_iter_count(iter);
return __exfat_direct_IO(rw, iocb, inode,
(void *)iter, offset, count, 0 /* UNUSED */);
}
#else
static ssize_t exfat_direct_IO(int rw, struct kiocb *iocb,
const struct iovec *iov, loff_t offset, unsigned long nr_segs)
{
struct file *file = iocb->ki_filp;
struct address_space *mapping = file->f_mapping;
struct inode *inode = mapping->host;
size_t count = iov_length(iov, nr_segs);
return __exfat_direct_IO(rw, iocb, inode,
(void *)iov, offset, count, nr_segs);
}
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 7, 0)
static inline ssize_t __exfat_blkdev_direct_IO(int unused, struct kiocb *iocb,