[linux-block.git] / fs / exfat / file.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
 */

#include <linux/slab.h>
#include <linux/compat.h>
#include <linux/cred.h>
#include <linux/buffer_head.h>
#include <linux/blkdev.h>
#include <linux/fsnotify.h>
#include <linux/security.h>
#include <linux/msdos_fs.h>
#include <linux/writeback.h>

#include "exfat_raw.h"
#include "exfat_fs.h"

static int exfat_cont_expand(struct inode *inode, loff_t size)
{
	int ret;
	unsigned int num_clusters, new_num_clusters, last_clu;
	struct exfat_inode_info *ei = EXFAT_I(inode);
	struct super_block *sb = inode->i_sb;
	struct exfat_sb_info *sbi = EXFAT_SB(sb);
	struct exfat_chain clu;

	ret = inode_newsize_ok(inode, size);
	if (ret)
		return ret;

	num_clusters = EXFAT_B_TO_CLU(exfat_ondisk_size(inode), sbi);
	new_num_clusters = EXFAT_B_TO_CLU_ROUND_UP(size, sbi);

	if (new_num_clusters == num_clusters)
		goto out;

	if (num_clusters) {
		exfat_chain_set(&clu, ei->start_clu, num_clusters, ei->flags);
		ret = exfat_find_last_cluster(sb, &clu, &last_clu);
		if (ret)
			return ret;

		clu.dir = last_clu + 1;
	} else {
		last_clu = EXFAT_EOF_CLUSTER;
		clu.dir = EXFAT_EOF_CLUSTER;
	}

	clu.size = 0;
	clu.flags = ei->flags;

	ret = exfat_alloc_cluster(inode, new_num_clusters - num_clusters,
			&clu, inode_needs_sync(inode));
	if (ret)
		return ret;

	/* Append new clusters to chain */
	if (num_clusters) {
		if (clu.flags != ei->flags)
			if (exfat_chain_cont_cluster(sb, ei->start_clu, num_clusters))
				goto free_clu;

		if (clu.flags == ALLOC_FAT_CHAIN)
			if (exfat_ent_set(sb, last_clu, clu.dir))
				goto free_clu;
	} else
		ei->start_clu = clu.dir;

	ei->flags = clu.flags;

out:
	inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
	/* Expanded range not zeroed, do not update valid_size */
	i_size_write(inode, size);

	inode->i_blocks = round_up(size, sbi->cluster_size) >> 9;
	mark_inode_dirty(inode);

	if (IS_SYNC(inode))
		return write_inode_now(inode, 1);

	return 0;

free_clu:
	exfat_free_cluster(inode, &clu);
	return -EIO;
}

static bool exfat_allow_set_time(struct mnt_idmap *idmap,
				 struct exfat_sb_info *sbi, struct inode *inode)
{
	mode_t allow_utime = sbi->options.allow_utime;

	if (!vfsuid_eq_kuid(i_uid_into_vfsuid(idmap, inode),
			    current_fsuid())) {
		if (vfsgid_in_group_p(i_gid_into_vfsgid(idmap, inode)))
			allow_utime >>= 3;
		if (allow_utime & MAY_WRITE)
			return true;
	}

	/* use a default check */
	return false;
}

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;

	mask = (S_ISREG(i_mode) || S_ISLNK(i_mode)) ?
		sbi->options.fs_fmask : 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 & 0555) != (i_mode & 0555))
		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 & 0222) && ((perm & 0222) != (0222 & ~mask)))
			return -EPERM;
	} else {
		/*
		 * If exfat_mode_can_hold_ro(inode) is false, can't change
		 * w bits.
		 */
		if ((perm & 0222) != (0222 & ~mask))
			return -EPERM;
	}

	*mode_ptr &= S_IFMT | perm;

	return 0;
}

/* resize the file length */
int __exfat_truncate(struct inode *inode)
{
	unsigned int num_clusters_new, num_clusters_phys;
	unsigned int last_clu = EXFAT_FREE_CLUSTER;
	struct exfat_chain clu;
	struct super_block *sb = inode->i_sb;
	struct exfat_sb_info *sbi = EXFAT_SB(sb);
	struct exfat_inode_info *ei = EXFAT_I(inode);

	/* check if the given file ID is opened */
	if (ei->type != TYPE_FILE && ei->type != TYPE_DIR)
		return -EPERM;

	exfat_set_volume_dirty(sb);

	num_clusters_new = EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi);
	num_clusters_phys = EXFAT_B_TO_CLU(exfat_ondisk_size(inode), sbi);

	exfat_chain_set(&clu, ei->start_clu, num_clusters_phys, ei->flags);

	if (i_size_read(inode) > 0) {
		/*
		 * Truncate FAT chain num_clusters after the first cluster
		 * num_clusters = min(new, phys);
		 */
		unsigned int num_clusters =
			min(num_clusters_new, num_clusters_phys);

		/*
		 * Follow FAT chain
		 * (defensive coding - works fine even with corrupted FAT table
		 */
		if (clu.flags == ALLOC_NO_FAT_CHAIN) {
			clu.dir += num_clusters;
			clu.size -= num_clusters;
		} else {
			while (num_clusters > 0) {
				last_clu = clu.dir;
				if (exfat_get_next_cluster(sb, &(clu.dir)))
					return -EIO;

				num_clusters--;
				clu.size--;
			}
		}
	} else {
		ei->flags = ALLOC_NO_FAT_CHAIN;
		ei->start_clu = EXFAT_EOF_CLUSTER;
	}

	if (i_size_read(inode) < ei->valid_size)
		ei->valid_size = i_size_read(inode);

	if (ei->type == TYPE_FILE)
		ei->attr |= EXFAT_ATTR_ARCHIVE;

	/*
	 * update the directory entry
	 *
	 * If the directory entry is updated by mark_inode_dirty(), the
	 * directory entry will be written after a writeback cycle of
	 * updating the bitmap/FAT, which may result in clusters being
	 * freed but referenced by the directory entry in the event of a
	 * sudden power failure.
	 * __exfat_write_inode() is called for directory entry, bitmap
	 * and FAT to be written in a same writeback.
	 */
	if (__exfat_write_inode(inode, inode_needs_sync(inode)))
		return -EIO;

	/* cut off from the FAT chain */
	if (ei->flags == ALLOC_FAT_CHAIN && last_clu != EXFAT_FREE_CLUSTER &&
			last_clu != EXFAT_EOF_CLUSTER) {
		if (exfat_ent_set(sb, last_clu, EXFAT_EOF_CLUSTER))
			return -EIO;
	}

	/* invalidate cache and free the clusters */
	/* clear exfat cache */
	exfat_cache_inval_inode(inode);

	/* hint information */
	ei->hint_bmap.off = EXFAT_EOF_CLUSTER;
	ei->hint_bmap.clu = EXFAT_EOF_CLUSTER;

	/* hint_stat will be used if this is directory. */
	ei->hint_stat.eidx = 0;
	ei->hint_stat.clu = ei->start_clu;
	ei->hint_femp.eidx = EXFAT_HINT_NONE;

	/* free the clusters */
	if (exfat_free_cluster(inode, &clu))
		return -EIO;

	return 0;
}

void exfat_truncate(struct inode *inode)
{
	struct super_block *sb = inode->i_sb;
	struct exfat_sb_info *sbi = EXFAT_SB(sb);
	struct exfat_inode_info *ei = EXFAT_I(inode);
	int err;

	mutex_lock(&sbi->s_lock);
	if (ei->start_clu == 0) {
		/*
		 * Empty start_clu != ~0 (not allocated)
		 */
		exfat_fs_error(sb, "tried to truncate zeroed cluster.");
		goto write_size;
	}

	err = __exfat_truncate(inode);
	if (err)
		goto write_size;

	inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >> 9;
write_size:
	mutex_unlock(&sbi->s_lock);
}

int exfat_getattr(struct mnt_idmap *idmap, const struct path *path,
		  struct kstat *stat, unsigned int request_mask,
		  unsigned int query_flags)
{
	struct inode *inode = d_backing_inode(path->dentry);
	struct exfat_inode_info *ei = EXFAT_I(inode);

	generic_fillattr(idmap, request_mask, inode, stat);
	exfat_truncate_atime(&stat->atime);
	stat->result_mask |= STATX_BTIME;
	stat->btime.tv_sec = ei->i_crtime.tv_sec;
	stat->btime.tv_nsec = ei->i_crtime.tv_nsec;
	stat->blksize = EXFAT_SB(inode->i_sb)->cluster_size;
	return 0;
}

int exfat_setattr(struct mnt_idmap *idmap, 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 (unlikely(exfat_forced_shutdown(inode->i_sb)))
		return -EIO;

	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;
	}

	/* Check for setting the inode time. */
	ia_valid = attr->ia_valid;
	if ((ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET)) &&
	    exfat_allow_set_time(idmap, sbi, inode)) {
		attr->ia_valid &= ~(ATTR_MTIME_SET | ATTR_ATIME_SET |
				ATTR_TIMES_SET);
	}

	error = setattr_prepare(idmap, dentry, attr);
	attr->ia_valid = ia_valid;
	if (error)
		goto out;

	if (((attr->ia_valid & ATTR_UID) &&
	      (!uid_eq(from_vfsuid(idmap, i_user_ns(inode), attr->ia_vfsuid),
	       sbi->options.fs_uid))) ||
	    ((attr->ia_valid & ATTR_GID) &&
	      (!gid_eq(from_vfsgid(idmap, i_user_ns(inode), attr->ia_vfsgid),
	       sbi->options.fs_gid))) ||
	    ((attr->ia_valid & ATTR_MODE) &&
	     (attr->ia_mode & ~(S_IFREG | S_IFLNK | S_IFDIR | 0777)))) {
		error = -EPERM;
		goto out;
	}

	/*
	 * 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;
	}

	if (attr->ia_valid & ATTR_SIZE)
		inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));

	setattr_copy(idmap, inode, attr);
	exfat_truncate_inode_atime(inode);

	if (attr->ia_valid & ATTR_SIZE) {
		error = exfat_block_truncate_page(inode, attr->ia_size);
		if (error)
			goto out;

		down_write(&EXFAT_I(inode)->truncate_lock);
		truncate_setsize(inode, attr->ia_size);

		/*
		 * __exfat_write_inode() is called from exfat_truncate(), inode
		 * is already written by it, so mark_inode_dirty() is unneeded.
		 */
		exfat_truncate(inode);
		up_write(&EXFAT_I(inode)->truncate_lock);
	} else
		mark_inode_dirty(inode);

out:
	return error;
}

/*
 * modified ioctls from fat/file.c by Welmer Almesberger
 */
static int exfat_ioctl_get_attributes(struct inode *inode, u32 __user *user_attr)
{
	u32 attr;

	inode_lock_shared(inode);
	attr = exfat_make_attr(inode);
	inode_unlock_shared(inode);

	return put_user(attr, user_attr);
}

static int exfat_ioctl_set_attributes(struct file *file, u32 __user *user_attr)
{
	struct inode *inode = file_inode(file);
	struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
	int is_dir = S_ISDIR(inode->i_mode);
	u32 attr, oldattr;
	struct iattr ia;
	int err;

	err = get_user(attr, user_attr);
	if (err)
		goto out;

	err = mnt_want_write_file(file);
	if (err)
		goto out;
	inode_lock(inode);

	oldattr = exfat_make_attr(inode);

	/*
	 * Mask attributes so we don't set reserved fields.
	 */
	attr &= (EXFAT_ATTR_READONLY | EXFAT_ATTR_HIDDEN | EXFAT_ATTR_SYSTEM |
		 EXFAT_ATTR_ARCHIVE);
	attr |= (is_dir ? EXFAT_ATTR_SUBDIR : 0);

	/* Equivalent to a chmod() */
	ia.ia_valid = ATTR_MODE | ATTR_CTIME;
	ia.ia_ctime = current_time(inode);
	if (is_dir)
		ia.ia_mode = exfat_make_mode(sbi, attr, 0777);
	else
		ia.ia_mode = exfat_make_mode(sbi, attr, 0666 | (inode->i_mode & 0111));

	/* The root directory has no attributes */
	if (inode->i_ino == EXFAT_ROOT_INO && attr != EXFAT_ATTR_SUBDIR) {
		err = -EINVAL;
		goto out_unlock_inode;
	}

	if (((attr | oldattr) & EXFAT_ATTR_SYSTEM) &&
	    !capable(CAP_LINUX_IMMUTABLE)) {
		err = -EPERM;
		goto out_unlock_inode;
	}

	/*
	 * The security check is questionable...  We single
	 * out the RO attribute for checking by the security
	 * module, just because it maps to a file mode.
	 */
	err = security_inode_setattr(file_mnt_idmap(file),
				     file->f_path.dentry, &ia);
	if (err)
		goto out_unlock_inode;

	/* This MUST be done before doing anything irreversible... */
	err = exfat_setattr(file_mnt_idmap(file), file->f_path.dentry, &ia);
	if (err)
		goto out_unlock_inode;

	fsnotify_change(file->f_path.dentry, ia.ia_valid);

	exfat_save_attr(inode, attr);
	mark_inode_dirty(inode);
out_unlock_inode:
	inode_unlock(inode);
	mnt_drop_write_file(file);
out:
	return err;
}

static int exfat_ioctl_fitrim(struct inode *inode, unsigned long arg)
{
	struct fstrim_range range;
	int ret = 0;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	if (!bdev_max_discard_sectors(inode->i_sb->s_bdev))
		return -EOPNOTSUPP;

	if (copy_from_user(&range, (struct fstrim_range __user *)arg, sizeof(range)))
		return -EFAULT;

	range.minlen = max_t(unsigned int, range.minlen,
				bdev_discard_granularity(inode->i_sb->s_bdev));

	ret = exfat_trim_fs(inode, &range);
	if (ret < 0)
		return ret;

	if (copy_to_user((struct fstrim_range __user *)arg, &range, sizeof(range)))
		return -EFAULT;

	return 0;
}

static int exfat_ioctl_shutdown(struct super_block *sb, unsigned long arg)
{
	u32 flags;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	if (get_user(flags, (__u32 __user *)arg))
		return -EFAULT;

	return exfat_force_shutdown(sb, flags);
}

long exfat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
	struct inode *inode = file_inode(filp);
	u32 __user *user_attr = (u32 __user *)arg;

	switch (cmd) {
	case FAT_IOCTL_GET_ATTRIBUTES:
		return exfat_ioctl_get_attributes(inode, user_attr);
	case FAT_IOCTL_SET_ATTRIBUTES:
		return exfat_ioctl_set_attributes(filp, user_attr);
	case EXFAT_IOC_SHUTDOWN:
		return exfat_ioctl_shutdown(inode->i_sb, arg);
	case FITRIM:
		return exfat_ioctl_fitrim(inode, arg);
	default:
		return -ENOTTY;
	}
}

#ifdef CONFIG_COMPAT
long exfat_compat_ioctl(struct file *filp, unsigned int cmd,
				unsigned long arg)
{
	return exfat_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
}
#endif

int exfat_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
{
	struct inode *inode = filp->f_mapping->host;
	int err;

	if (unlikely(exfat_forced_shutdown(inode->i_sb)))
		return -EIO;

	err = __generic_file_fsync(filp, start, end, datasync);
	if (err)
		return err;

	err = sync_blockdev(inode->i_sb->s_bdev);
	if (err)
		return err;

	return blkdev_issue_flush(inode->i_sb->s_bdev);
}

static int exfat_extend_valid_size(struct file *file, loff_t new_valid_size)
{
	int err;
	loff_t pos;
	struct inode *inode = file_inode(file);
	struct exfat_inode_info *ei = EXFAT_I(inode);
	struct address_space *mapping = inode->i_mapping;
	const struct address_space_operations *ops = mapping->a_ops;

	pos = ei->valid_size;
	while (pos < new_valid_size) {
		u32 len;
		struct folio *folio;
		unsigned long off;

		len = PAGE_SIZE - (pos & (PAGE_SIZE - 1));
		if (pos + len > new_valid_size)
			len = new_valid_size - pos;

		err = ops->write_begin(file, mapping, pos, len, &folio, NULL);
		if (err)
			goto out;

		off = offset_in_folio(folio, pos);
		folio_zero_new_buffers(folio, off, off + len);

		err = ops->write_end(file, mapping, pos, len, len, folio, NULL);
		if (err < 0)
			goto out;
		pos += len;

		balance_dirty_pages_ratelimited(mapping);
		cond_resched();
	}

	return 0;

out:
	return err;
}

static ssize_t exfat_file_write_iter(struct kiocb *iocb, struct iov_iter *iter)
{
	ssize_t ret;
	struct file *file = iocb->ki_filp;
	struct inode *inode = file_inode(file);
	struct exfat_inode_info *ei = EXFAT_I(inode);
	loff_t pos = iocb->ki_pos;
	loff_t valid_size;

	if (unlikely(exfat_forced_shutdown(inode->i_sb)))
		return -EIO;

	inode_lock(inode);

	valid_size = ei->valid_size;

	ret = generic_write_checks(iocb, iter);
	if (ret <= 0)
		goto unlock;

	if (iocb->ki_flags & IOCB_DIRECT) {
		unsigned long align = pos | iov_iter_alignment(iter);

		if (!IS_ALIGNED(align, i_blocksize(inode)) &&
		    !IS_ALIGNED(align, bdev_logical_block_size(inode->i_sb->s_bdev))) {
			ret = -EINVAL;
			goto unlock;
		}
	}

	if (pos > valid_size) {
		ret = exfat_extend_valid_size(file, pos);
		if (ret < 0 && ret != -ENOSPC) {
			exfat_err(inode->i_sb,
				"write: fail to zero from %llu to %llu(%zd)",
				valid_size, pos, ret);
		}
		if (ret < 0)
			goto unlock;
	}

	ret = __generic_file_write_iter(iocb, iter);
	if (ret < 0)
		goto unlock;

	inode_unlock(inode);

	if (pos > valid_size)
		pos = valid_size;

	if (iocb_is_dsync(iocb) && iocb->ki_pos > pos) {
		ssize_t err = vfs_fsync_range(file, pos, iocb->ki_pos - 1,
				iocb->ki_flags & IOCB_SYNC);
		if (err < 0)
			return err;
	}

	return ret;

unlock:
	inode_unlock(inode);

	return ret;
}

static ssize_t exfat_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
{
	struct inode *inode = file_inode(iocb->ki_filp);

	if (unlikely(exfat_forced_shutdown(inode->i_sb)))
		return -EIO;

	return generic_file_read_iter(iocb, iter);
}

static vm_fault_t exfat_page_mkwrite(struct vm_fault *vmf)
{
	int err;
	struct vm_area_struct *vma = vmf->vma;
	struct file *file = vma->vm_file;
	struct inode *inode = file_inode(file);
	struct exfat_inode_info *ei = EXFAT_I(inode);
	loff_t start, end;

	if (!inode_trylock(inode))
		return VM_FAULT_RETRY;

	start = ((loff_t)vma->vm_pgoff << PAGE_SHIFT);
	end = min_t(loff_t, i_size_read(inode),
			start + vma->vm_end - vma->vm_start);

	if (ei->valid_size < end) {
		err = exfat_extend_valid_size(file, end);
		if (err < 0) {
			inode_unlock(inode);
			return vmf_fs_error(err);
		}
	}

	inode_unlock(inode);

	return filemap_page_mkwrite(vmf);
}

static const struct vm_operations_struct exfat_file_vm_ops = {
	.fault		= filemap_fault,
	.map_pages	= filemap_map_pages,
	.page_mkwrite	= exfat_page_mkwrite,
};

static int exfat_file_mmap(struct file *file, struct vm_area_struct *vma)
{
	if (unlikely(exfat_forced_shutdown(file_inode(file)->i_sb)))
		return -EIO;

	file_accessed(file);
	vma->vm_ops = &exfat_file_vm_ops;
	return 0;
}

static ssize_t exfat_splice_read(struct file *in, loff_t *ppos,
		struct pipe_inode_info *pipe, size_t len, unsigned int flags)
{
	if (unlikely(exfat_forced_shutdown(file_inode(in)->i_sb)))
		return -EIO;

	return filemap_splice_read(in, ppos, pipe, len, flags);
}

const struct file_operations exfat_file_operations = {
	.llseek		= generic_file_llseek,
	.read_iter	= exfat_file_read_iter,
	.write_iter	= exfat_file_write_iter,
	.unlocked_ioctl = exfat_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl = exfat_compat_ioctl,
#endif
	.mmap		= exfat_file_mmap,
	.fsync		= exfat_file_fsync,
	.splice_read	= exfat_splice_read,
	.splice_write	= iter_file_splice_write,
};

const struct inode_operations exfat_file_inode_operations = {
	.setattr     = exfat_setattr,
	.getattr     = exfat_getattr,
};
Commit	Line	Data
	1	// SPDX-License-Identifier: GPL-2.0-or-later
	2	/*
	3	* Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
	4	*/
	5
	6	#include <linux/slab.h>
	7	#include <linux/compat.h>
	8	#include <linux/cred.h>
	9	#include <linux/buffer_head.h>
	10	#include <linux/blkdev.h>
	11	#include <linux/fsnotify.h>
	12	#include <linux/security.h>
	13	#include <linux/msdos_fs.h>
	14	#include <linux/writeback.h>
	15
	16	#include "exfat_raw.h"
	17	#include "exfat_fs.h"
	18
	19	static int exfat_cont_expand(struct inode *inode, loff_t size)
	20	{
	21	int ret;
	22	unsigned int num_clusters, new_num_clusters, last_clu;
	23	struct exfat_inode_info *ei = EXFAT_I(inode);
	24	struct super_block *sb = inode->i_sb;
	25	struct exfat_sb_info *sbi = EXFAT_SB(sb);
	26	struct exfat_chain clu;
	27
	28	ret = inode_newsize_ok(inode, size);
	29	if (ret)
	30	return ret;
	31
	32	num_clusters = EXFAT_B_TO_CLU(exfat_ondisk_size(inode), sbi);
	33	new_num_clusters = EXFAT_B_TO_CLU_ROUND_UP(size, sbi);
	34
	35	if (new_num_clusters == num_clusters)
	36	goto out;
	37
	38	if (num_clusters) {
	39	exfat_chain_set(&clu, ei->start_clu, num_clusters, ei->flags);
	40	ret = exfat_find_last_cluster(sb, &clu, &last_clu);
	41	if (ret)
	42	return ret;
	43
	44	clu.dir = last_clu + 1;
	45	} else {
	46	last_clu = EXFAT_EOF_CLUSTER;
	47	clu.dir = EXFAT_EOF_CLUSTER;
	48	}
	49
	50	clu.size = 0;
	51	clu.flags = ei->flags;
	52
	53	ret = exfat_alloc_cluster(inode, new_num_clusters - num_clusters,
	54	&clu, inode_needs_sync(inode));
	55	if (ret)
	56	return ret;
	57
	58	/* Append new clusters to chain */
	59	if (num_clusters) {
	60	if (clu.flags != ei->flags)
	61	if (exfat_chain_cont_cluster(sb, ei->start_clu, num_clusters))
	62	goto free_clu;
	63
	64	if (clu.flags == ALLOC_FAT_CHAIN)
	65	if (exfat_ent_set(sb, last_clu, clu.dir))
	66	goto free_clu;
	67	} else
	68	ei->start_clu = clu.dir;
	69
	70	ei->flags = clu.flags;
	71
	72	out:
	73	inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
	74	/* Expanded range not zeroed, do not update valid_size */
	75	i_size_write(inode, size);
	76
	77	inode->i_blocks = round_up(size, sbi->cluster_size) >> 9;
	78	mark_inode_dirty(inode);
	79
	80	if (IS_SYNC(inode))
	81	return write_inode_now(inode, 1);
	82
	83	return 0;
	84
	85	free_clu:
	86	exfat_free_cluster(inode, &clu);
	87	return -EIO;
	88	}
	89
	90	static bool exfat_allow_set_time(struct mnt_idmap *idmap,
	91	struct exfat_sb_info sbi, struct inode inode)
	92	{
	93	mode_t allow_utime = sbi->options.allow_utime;
	94
	95	if (!vfsuid_eq_kuid(i_uid_into_vfsuid(idmap, inode),
	96	current_fsuid())) {
	97	if (vfsgid_in_group_p(i_gid_into_vfsgid(idmap, inode)))
	98	allow_utime >>= 3;
	99	if (allow_utime & MAY_WRITE)
	100	return true;
	101	}
	102
	103	/* use a default check */
	104	return false;
	105	}
	106
	107	static int exfat_sanitize_mode(const struct exfat_sb_info *sbi,
	108	struct inode inode, umode_t mode_ptr)
	109	{
	110	mode_t i_mode, mask, perm;
	111
	112	i_mode = inode->i_mode;
	113
	114	mask = (S_ISREG(i_mode) \|\| S_ISLNK(i_mode)) ?
	115	sbi->options.fs_fmask : sbi->options.fs_dmask;
	116	perm = *mode_ptr & ~(S_IFMT \| mask);
	117
	118	/* Of the r and x bits, all (subject to umask) must be present.*/
	119	if ((perm & 0555) != (i_mode & 0555))
	120	return -EPERM;
	121
	122	if (exfat_mode_can_hold_ro(inode)) {
	123	/*
	124	* Of the w bits, either all (subject to umask) or none must
	125	* be present.
	126	*/
	127	if ((perm & 0222) && ((perm & 0222) != (0222 & ~mask)))
	128	return -EPERM;
	129	} else {
	130	/*
	131	* If exfat_mode_can_hold_ro(inode) is false, can't change
	132	* w bits.
	133	*/
	134	if ((perm & 0222) != (0222 & ~mask))
	135	return -EPERM;
	136	}
	137
	138	*mode_ptr &= S_IFMT \| perm;
	139
	140	return 0;
	141	}
	142
	143	/* resize the file length */
	144	int __exfat_truncate(struct inode *inode)
	145	{
	146	unsigned int num_clusters_new, num_clusters_phys;
	147	unsigned int last_clu = EXFAT_FREE_CLUSTER;
	148	struct exfat_chain clu;
	149	struct super_block *sb = inode->i_sb;
	150	struct exfat_sb_info *sbi = EXFAT_SB(sb);
	151	struct exfat_inode_info *ei = EXFAT_I(inode);
	152
	153	/* check if the given file ID is opened */
	154	if (ei->type != TYPE_FILE && ei->type != TYPE_DIR)
	155	return -EPERM;
	156
	157	exfat_set_volume_dirty(sb);
	158
	159	num_clusters_new = EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi);
	160	num_clusters_phys = EXFAT_B_TO_CLU(exfat_ondisk_size(inode), sbi);
	161
	162	exfat_chain_set(&clu, ei->start_clu, num_clusters_phys, ei->flags);
	163
	164	if (i_size_read(inode) > 0) {
	165	/*
	166	* Truncate FAT chain num_clusters after the first cluster
	167	* num_clusters = min(new, phys);
	168	*/
	169	unsigned int num_clusters =
	170	min(num_clusters_new, num_clusters_phys);
	171
	172	/*
	173	* Follow FAT chain
	174	* (defensive coding - works fine even with corrupted FAT table
	175	*/
	176	if (clu.flags == ALLOC_NO_FAT_CHAIN) {
	177	clu.dir += num_clusters;
	178	clu.size -= num_clusters;
	179	} else {
	180	while (num_clusters > 0) {
	181	last_clu = clu.dir;
	182	if (exfat_get_next_cluster(sb, &(clu.dir)))
	183	return -EIO;
	184
	185	num_clusters--;
	186	clu.size--;
	187	}
	188	}
	189	} else {
	190	ei->flags = ALLOC_NO_FAT_CHAIN;
	191	ei->start_clu = EXFAT_EOF_CLUSTER;
	192	}
	193
	194	if (i_size_read(inode) < ei->valid_size)
	195	ei->valid_size = i_size_read(inode);
	196
	197	if (ei->type == TYPE_FILE)
	198	ei->attr \|= EXFAT_ATTR_ARCHIVE;
	199
	200	/*
	201	* update the directory entry
	202	*
	203	* If the directory entry is updated by mark_inode_dirty(), the
	204	* directory entry will be written after a writeback cycle of
	205	* updating the bitmap/FAT, which may result in clusters being
	206	* freed but referenced by the directory entry in the event of a
	207	* sudden power failure.
	208	* __exfat_write_inode() is called for directory entry, bitmap
	209	* and FAT to be written in a same writeback.
	210	*/
	211	if (__exfat_write_inode(inode, inode_needs_sync(inode)))
	212	return -EIO;
	213
	214	/* cut off from the FAT chain */
	215	if (ei->flags == ALLOC_FAT_CHAIN && last_clu != EXFAT_FREE_CLUSTER &&
	216	last_clu != EXFAT_EOF_CLUSTER) {
	217	if (exfat_ent_set(sb, last_clu, EXFAT_EOF_CLUSTER))
	218	return -EIO;
	219	}
	220
	221	/* invalidate cache and free the clusters */
	222	/* clear exfat cache */
	223	exfat_cache_inval_inode(inode);
	224
	225	/* hint information */
	226	ei->hint_bmap.off = EXFAT_EOF_CLUSTER;
	227	ei->hint_bmap.clu = EXFAT_EOF_CLUSTER;
	228
	229	/* hint_stat will be used if this is directory. */
	230	ei->hint_stat.eidx = 0;
	231	ei->hint_stat.clu = ei->start_clu;
	232	ei->hint_femp.eidx = EXFAT_HINT_NONE;
	233
	234	/* free the clusters */
	235	if (exfat_free_cluster(inode, &clu))
	236	return -EIO;
	237
	238	return 0;
	239	}
	240
	241	void exfat_truncate(struct inode *inode)
	242	{
	243	struct super_block *sb = inode->i_sb;
	244	struct exfat_sb_info *sbi = EXFAT_SB(sb);
	245	struct exfat_inode_info *ei = EXFAT_I(inode);
	246	int err;
	247
	248	mutex_lock(&sbi->s_lock);
	249	if (ei->start_clu == 0) {
	250	/*
	251	* Empty start_clu != ~0 (not allocated)
	252	*/
	253	exfat_fs_error(sb, "tried to truncate zeroed cluster.");
	254	goto write_size;
	255	}
	256
	257	err = __exfat_truncate(inode);
	258	if (err)
	259	goto write_size;
	260
	261	inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >> 9;
	262	write_size:
	263	mutex_unlock(&sbi->s_lock);
	264	}
	265
	266	int exfat_getattr(struct mnt_idmap idmap, const struct path path,
	267	struct kstat *stat, unsigned int request_mask,
	268	unsigned int query_flags)
	269	{
	270	struct inode *inode = d_backing_inode(path->dentry);
	271	struct exfat_inode_info *ei = EXFAT_I(inode);
	272
	273	generic_fillattr(idmap, request_mask, inode, stat);
	274	exfat_truncate_atime(&stat->atime);
	275	stat->result_mask \|= STATX_BTIME;
	276	stat->btime.tv_sec = ei->i_crtime.tv_sec;
	277	stat->btime.tv_nsec = ei->i_crtime.tv_nsec;
	278	stat->blksize = EXFAT_SB(inode->i_sb)->cluster_size;
	279	return 0;
	280	}
	281
	282	int exfat_setattr(struct mnt_idmap idmap, struct dentry dentry,
	283	struct iattr *attr)
	284	{
	285	struct exfat_sb_info *sbi = EXFAT_SB(dentry->d_sb);
	286	struct inode *inode = dentry->d_inode;
	287	unsigned int ia_valid;
	288	int error;
	289
	290	if (unlikely(exfat_forced_shutdown(inode->i_sb)))
	291	return -EIO;
	292
	293	if ((attr->ia_valid & ATTR_SIZE) &&
	294	attr->ia_size > i_size_read(inode)) {
	295	error = exfat_cont_expand(inode, attr->ia_size);
	296	if (error \|\| attr->ia_valid == ATTR_SIZE)
	297	return error;
	298	attr->ia_valid &= ~ATTR_SIZE;
	299	}
	300
	301	/* Check for setting the inode time. */
	302	ia_valid = attr->ia_valid;
	303	if ((ia_valid & (ATTR_MTIME_SET \| ATTR_ATIME_SET \| ATTR_TIMES_SET)) &&
	304	exfat_allow_set_time(idmap, sbi, inode)) {
	305	attr->ia_valid &= ~(ATTR_MTIME_SET \| ATTR_ATIME_SET \|
	306	ATTR_TIMES_SET);
	307	}
	308
	309	error = setattr_prepare(idmap, dentry, attr);
	310	attr->ia_valid = ia_valid;
	311	if (error)
	312	goto out;
	313
	314	if (((attr->ia_valid & ATTR_UID) &&
	315	(!uid_eq(from_vfsuid(idmap, i_user_ns(inode), attr->ia_vfsuid),
	316	sbi->options.fs_uid))) \|\|
	317	((attr->ia_valid & ATTR_GID) &&
	318	(!gid_eq(from_vfsgid(idmap, i_user_ns(inode), attr->ia_vfsgid),
	319	sbi->options.fs_gid))) \|\|
	320	((attr->ia_valid & ATTR_MODE) &&
	321	(attr->ia_mode & ~(S_IFREG \| S_IFLNK \| S_IFDIR \| 0777)))) {
	322	error = -EPERM;
	323	goto out;
	324	}
	325
	326	/*
	327	* We don't return -EPERM here. Yes, strange, but this is too
	328	* old behavior.
	329	*/
	330	if (attr->ia_valid & ATTR_MODE) {
	331	if (exfat_sanitize_mode(sbi, inode, &attr->ia_mode) < 0)
	332	attr->ia_valid &= ~ATTR_MODE;
	333	}
	334
	335	if (attr->ia_valid & ATTR_SIZE)
	336	inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
	337
	338	setattr_copy(idmap, inode, attr);
	339	exfat_truncate_inode_atime(inode);
	340
	341	if (attr->ia_valid & ATTR_SIZE) {
	342	error = exfat_block_truncate_page(inode, attr->ia_size);
	343	if (error)
	344	goto out;
	345
	346	down_write(&EXFAT_I(inode)->truncate_lock);
	347	truncate_setsize(inode, attr->ia_size);
	348
	349	/*
	350	* __exfat_write_inode() is called from exfat_truncate(), inode
	351	* is already written by it, so mark_inode_dirty() is unneeded.
	352	*/
	353	exfat_truncate(inode);
	354	up_write(&EXFAT_I(inode)->truncate_lock);
	355	} else
	356	mark_inode_dirty(inode);
	357
	358	out:
	359	return error;
	360	}
	361
	362	/*
	363	* modified ioctls from fat/file.c by Welmer Almesberger
	364	*/
	365	static int exfat_ioctl_get_attributes(struct inode inode, u32 __user user_attr)
	366	{
	367	u32 attr;
	368
	369	inode_lock_shared(inode);
	370	attr = exfat_make_attr(inode);
	371	inode_unlock_shared(inode);
	372
	373	return put_user(attr, user_attr);
	374	}
	375
	376	static int exfat_ioctl_set_attributes(struct file file, u32 __user user_attr)
	377	{
	378	struct inode *inode = file_inode(file);
	379	struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
	380	int is_dir = S_ISDIR(inode->i_mode);
	381	u32 attr, oldattr;
	382	struct iattr ia;
	383	int err;
	384
	385	err = get_user(attr, user_attr);
	386	if (err)
	387	goto out;
	388
	389	err = mnt_want_write_file(file);
	390	if (err)
	391	goto out;
	392	inode_lock(inode);
	393
	394	oldattr = exfat_make_attr(inode);
	395
	396	/*
	397	* Mask attributes so we don't set reserved fields.
	398	*/
	399	attr &= (EXFAT_ATTR_READONLY \| EXFAT_ATTR_HIDDEN \| EXFAT_ATTR_SYSTEM \|
	400	EXFAT_ATTR_ARCHIVE);
	401	attr \|= (is_dir ? EXFAT_ATTR_SUBDIR : 0);
	402
	403	/* Equivalent to a chmod() */
	404	ia.ia_valid = ATTR_MODE \| ATTR_CTIME;
	405	ia.ia_ctime = current_time(inode);
	406	if (is_dir)
	407	ia.ia_mode = exfat_make_mode(sbi, attr, 0777);
	408	else
	409	ia.ia_mode = exfat_make_mode(sbi, attr, 0666 \| (inode->i_mode & 0111));
	410
	411	/* The root directory has no attributes */
	412	if (inode->i_ino == EXFAT_ROOT_INO && attr != EXFAT_ATTR_SUBDIR) {
	413	err = -EINVAL;
	414	goto out_unlock_inode;
	415	}
	416
	417	if (((attr \| oldattr) & EXFAT_ATTR_SYSTEM) &&
	418	!capable(CAP_LINUX_IMMUTABLE)) {
	419	err = -EPERM;
	420	goto out_unlock_inode;
	421	}
	422
	423	/*
	424	* The security check is questionable... We single
	425	* out the RO attribute for checking by the security
	426	* module, just because it maps to a file mode.
	427	*/
	428	err = security_inode_setattr(file_mnt_idmap(file),
	429	file->f_path.dentry, &ia);
	430	if (err)
	431	goto out_unlock_inode;
	432
	433	/* This MUST be done before doing anything irreversible... */
	434	err = exfat_setattr(file_mnt_idmap(file), file->f_path.dentry, &ia);
	435	if (err)
	436	goto out_unlock_inode;
	437
	438	fsnotify_change(file->f_path.dentry, ia.ia_valid);
	439
	440	exfat_save_attr(inode, attr);
	441	mark_inode_dirty(inode);
	442	out_unlock_inode:
	443	inode_unlock(inode);
	444	mnt_drop_write_file(file);
	445	out:
	446	return err;
	447	}
	448
	449	static int exfat_ioctl_fitrim(struct inode *inode, unsigned long arg)
	450	{
	451	struct fstrim_range range;
	452	int ret = 0;
	453
	454	if (!capable(CAP_SYS_ADMIN))
	455	return -EPERM;
	456
	457	if (!bdev_max_discard_sectors(inode->i_sb->s_bdev))
	458	return -EOPNOTSUPP;
	459
	460	if (copy_from_user(&range, (struct fstrim_range __user *)arg, sizeof(range)))
	461	return -EFAULT;
	462
	463	range.minlen = max_t(unsigned int, range.minlen,
	464	bdev_discard_granularity(inode->i_sb->s_bdev));
	465
	466	ret = exfat_trim_fs(inode, &range);
	467	if (ret < 0)
	468	return ret;
	469
	470	if (copy_to_user((struct fstrim_range __user *)arg, &range, sizeof(range)))
	471	return -EFAULT;
	472
	473	return 0;
	474	}
	475
	476	static int exfat_ioctl_shutdown(struct super_block *sb, unsigned long arg)
	477	{
	478	u32 flags;
	479
	480	if (!capable(CAP_SYS_ADMIN))
	481	return -EPERM;
	482
	483	if (get_user(flags, (__u32 __user *)arg))
	484	return -EFAULT;
	485
	486	return exfat_force_shutdown(sb, flags);
	487	}
	488
	489	long exfat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
	490	{
	491	struct inode *inode = file_inode(filp);
	492	u32 __user user_attr = (u32 __user )arg;
	493
	494	switch (cmd) {
	495	case FAT_IOCTL_GET_ATTRIBUTES:
	496	return exfat_ioctl_get_attributes(inode, user_attr);
	497	case FAT_IOCTL_SET_ATTRIBUTES:
	498	return exfat_ioctl_set_attributes(filp, user_attr);
	499	case EXFAT_IOC_SHUTDOWN:
	500	return exfat_ioctl_shutdown(inode->i_sb, arg);
	501	case FITRIM:
	502	return exfat_ioctl_fitrim(inode, arg);
	503	default:
	504	return -ENOTTY;
	505	}
	506	}
	507
	508	#ifdef CONFIG_COMPAT
	509	long exfat_compat_ioctl(struct file *filp, unsigned int cmd,
	510	unsigned long arg)
	511	{
	512	return exfat_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
	513	}
	514	#endif
	515
	516	int exfat_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
	517	{
	518	struct inode *inode = filp->f_mapping->host;
	519	int err;
	520
	521	if (unlikely(exfat_forced_shutdown(inode->i_sb)))
	522	return -EIO;
	523
	524	err = __generic_file_fsync(filp, start, end, datasync);
	525	if (err)
	526	return err;
	527
	528	err = sync_blockdev(inode->i_sb->s_bdev);
	529	if (err)
	530	return err;
	531
	532	return blkdev_issue_flush(inode->i_sb->s_bdev);
	533	}
	534
	535	static int exfat_extend_valid_size(struct file *file, loff_t new_valid_size)
	536	{
	537	int err;
	538	loff_t pos;
	539	struct inode *inode = file_inode(file);
	540	struct exfat_inode_info *ei = EXFAT_I(inode);
	541	struct address_space *mapping = inode->i_mapping;
	542	const struct address_space_operations *ops = mapping->a_ops;
	543
	544	pos = ei->valid_size;
	545	while (pos < new_valid_size) {
	546	u32 len;
	547	struct folio *folio;
	548	unsigned long off;
	549
	550	len = PAGE_SIZE - (pos & (PAGE_SIZE - 1));
	551	if (pos + len > new_valid_size)
	552	len = new_valid_size - pos;
	553
	554	err = ops->write_begin(file, mapping, pos, len, &folio, NULL);
	555	if (err)
	556	goto out;
	557
	558	off = offset_in_folio(folio, pos);
	559	folio_zero_new_buffers(folio, off, off + len);
	560
	561	err = ops->write_end(file, mapping, pos, len, len, folio, NULL);
	562	if (err < 0)
	563	goto out;
	564	pos += len;
	565
	566	balance_dirty_pages_ratelimited(mapping);
	567	cond_resched();
	568	}
	569
	570	return 0;
	571
	572	out:
	573	return err;
	574	}
	575
	576	static ssize_t exfat_file_write_iter(struct kiocb iocb, struct iov_iter iter)
	577	{
	578	ssize_t ret;
	579	struct file *file = iocb->ki_filp;
	580	struct inode *inode = file_inode(file);
	581	struct exfat_inode_info *ei = EXFAT_I(inode);
	582	loff_t pos = iocb->ki_pos;
	583	loff_t valid_size;
	584
	585	if (unlikely(exfat_forced_shutdown(inode->i_sb)))
	586	return -EIO;
	587
	588	inode_lock(inode);
	589
	590	valid_size = ei->valid_size;
	591
	592	ret = generic_write_checks(iocb, iter);
	593	if (ret <= 0)
	594	goto unlock;
	595
	596	if (iocb->ki_flags & IOCB_DIRECT) {
	597	unsigned long align = pos \| iov_iter_alignment(iter);
	598
	599	if (!IS_ALIGNED(align, i_blocksize(inode)) &&
	600	!IS_ALIGNED(align, bdev_logical_block_size(inode->i_sb->s_bdev))) {
	601	ret = -EINVAL;
	602	goto unlock;
	603	}
	604	}
	605
	606	if (pos > valid_size) {
	607	ret = exfat_extend_valid_size(file, pos);
	608	if (ret < 0 && ret != -ENOSPC) {
	609	exfat_err(inode->i_sb,
	610	"write: fail to zero from %llu to %llu(%zd)",
	611	valid_size, pos, ret);
	612	}
	613	if (ret < 0)
	614	goto unlock;
	615	}
	616
	617	ret = __generic_file_write_iter(iocb, iter);
	618	if (ret < 0)
	619	goto unlock;
	620
	621	inode_unlock(inode);
	622
	623	if (pos > valid_size)
	624	pos = valid_size;
	625
	626	if (iocb_is_dsync(iocb) && iocb->ki_pos > pos) {
	627	ssize_t err = vfs_fsync_range(file, pos, iocb->ki_pos - 1,
	628	iocb->ki_flags & IOCB_SYNC);
	629	if (err < 0)
	630	return err;
	631	}
	632
	633	return ret;
	634
	635	unlock:
	636	inode_unlock(inode);
	637
	638	return ret;
	639	}
	640
	641	static ssize_t exfat_file_read_iter(struct kiocb iocb, struct iov_iter iter)
	642	{
	643	struct inode *inode = file_inode(iocb->ki_filp);
	644
	645	if (unlikely(exfat_forced_shutdown(inode->i_sb)))
	646	return -EIO;
	647
	648	return generic_file_read_iter(iocb, iter);
	649	}
	650
	651	static vm_fault_t exfat_page_mkwrite(struct vm_fault *vmf)
	652	{
	653	int err;
	654	struct vm_area_struct *vma = vmf->vma;
	655	struct file *file = vma->vm_file;
	656	struct inode *inode = file_inode(file);
	657	struct exfat_inode_info *ei = EXFAT_I(inode);
	658	loff_t start, end;
	659
	660	if (!inode_trylock(inode))
	661	return VM_FAULT_RETRY;
	662
	663	start = ((loff_t)vma->vm_pgoff << PAGE_SHIFT);
	664	end = min_t(loff_t, i_size_read(inode),
	665	start + vma->vm_end - vma->vm_start);
	666
	667	if (ei->valid_size < end) {
	668	err = exfat_extend_valid_size(file, end);
	669	if (err < 0) {
	670	inode_unlock(inode);
	671	return vmf_fs_error(err);
	672	}
	673	}
	674
	675	inode_unlock(inode);
	676
	677	return filemap_page_mkwrite(vmf);
	678	}
	679
	680	static const struct vm_operations_struct exfat_file_vm_ops = {
	681	.fault = filemap_fault,
	682	.map_pages = filemap_map_pages,
	683	.page_mkwrite = exfat_page_mkwrite,
	684	};
	685
	686	static int exfat_file_mmap(struct file file, struct vm_area_struct vma)
	687	{
	688	if (unlikely(exfat_forced_shutdown(file_inode(file)->i_sb)))
	689	return -EIO;
	690
	691	file_accessed(file);
	692	vma->vm_ops = &exfat_file_vm_ops;
	693	return 0;
	694	}
	695
	696	static ssize_t exfat_splice_read(struct file in, loff_t ppos,
	697	struct pipe_inode_info *pipe, size_t len, unsigned int flags)
	698	{
	699	if (unlikely(exfat_forced_shutdown(file_inode(in)->i_sb)))
	700	return -EIO;
	701
	702	return filemap_splice_read(in, ppos, pipe, len, flags);
	703	}
	704
	705	const struct file_operations exfat_file_operations = {
	706	.llseek = generic_file_llseek,
	707	.read_iter = exfat_file_read_iter,
	708	.write_iter = exfat_file_write_iter,
	709	.unlocked_ioctl = exfat_ioctl,
	710	#ifdef CONFIG_COMPAT
	711	.compat_ioctl = exfat_compat_ioctl,
	712	#endif
	713	.mmap = exfat_file_mmap,
	714	.fsync = exfat_file_fsync,
	715	.splice_read = exfat_splice_read,
	716	.splice_write = iter_file_splice_write,
	717	};
	718
	719	const struct inode_operations exfat_file_inode_operations = {
	720	.setattr = exfat_setattr,
	721	.getattr = exfat_getattr,
	722	};