path: root/fs/ntfs3/file.c

// SPDX-License-Identifier: GPL-2.0
/*
 *
 * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
 *
 *  Regular file handling primitives for NTFS-based filesystems.
 *
 */

#include <linux/backing-dev.h>
#include <linux/blkdev.h>
#include <linux/buffer_head.h>
#include <linux/compat.h>
#include <linux/falloc.h>
#include <linux/fiemap.h>

#include "debug.h"
#include "ntfs.h"
#include "ntfs_fs.h"

static int ntfs_ioctl_fitrim(struct ntfs_sb_info *sbi, unsigned long arg)
{
	struct fstrim_range __user *user_range;
	struct fstrim_range range;
	int err;

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

	if (!bdev_max_discard_sectors(sbi->sb->s_bdev))
		return -EOPNOTSUPP;

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

	range.minlen = max_t(u32, range.minlen,
			     bdev_discard_granularity(sbi->sb->s_bdev));

	err = ntfs_trim_fs(sbi, &range);
	if (err < 0)
		return err;

	if (copy_to_user(user_range, &range, sizeof(range)))
		return -EFAULT;

	return 0;
}

static long ntfs_ioctl(struct file *filp, u32 cmd, unsigned long arg)
{
	struct inode *inode = file_inode(filp);
	struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;

	switch (cmd) {
	case FITRIM:
		return ntfs_ioctl_fitrim(sbi, arg);
	}
	return -ENOTTY; /* Inappropriate ioctl for device. */
}

#ifdef CONFIG_COMPAT
static long ntfs_compat_ioctl(struct file *filp, u32 cmd, unsigned long arg)

{
	return ntfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
}
#endif

/*
 * ntfs_getattr - inode_operations::getattr
 */
int ntfs_getattr(struct user_namespace *mnt_userns, const struct path *path,
		 struct kstat *stat, u32 request_mask, u32 flags)
{
	struct inode *inode = d_inode(path->dentry);
	struct ntfs_inode *ni = ntfs_i(inode);

	if (is_compressed(ni))
		stat->attributes |= STATX_ATTR_COMPRESSED;

	if (is_encrypted(ni))
		stat->attributes |= STATX_ATTR_ENCRYPTED;

	stat->attributes_mask |= STATX_ATTR_COMPRESSED | STATX_ATTR_ENCRYPTED;

	generic_fillattr(mnt_userns, inode, stat);

	stat->result_mask |= STATX_BTIME;
	stat->btime = ni->i_crtime;
	stat->blksize = ni->mi.sbi->cluster_size; /* 512, 1K, ..., 2M */

	return 0;
}

static int ntfs_extend_initialized_size(struct file *file,
					struct ntfs_inode *ni,
					const loff_t valid,
					const loff_t new_valid)
{
	struct inode *inode = &ni->vfs_inode;
	struct address_space *mapping = inode->i_mapping;
	struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
	loff_t pos = valid;
	int err;