Unverified Commit ae91dfe3 authored by Konstantin Komarov's avatar Konstantin Komarov
Browse files

fs/ntfs3: implement NTFS3_IOC_SHUTDOWN ioctl 



Add support for the NTFS3_IOC_SHUTDOWN ioctl, allowing userspace to
request a filesystem shutdown. The ioctl number is shared with other
filesystems such as ext4, exfat, and f2fs.

Signed-off-by: default avatarKonstantin Komarov <almaz.alexandrovich@paragon-software.com>
parent 2109b080

fs/ntfs3/file.c

+43 −1
Original line number Diff line number Diff line
@@ -19,6 +19,12 @@ 
#include "ntfs.h"

#include "ntfs_fs.h"



/*

 * cifx, btrfs, exfat, ext4, f2fs use this constant.

 * Hope this value will become common to all fs.

 */

#define NTFS3_IOC_SHUTDOWN _IOR('X', 125, __u32)



static int ntfs_ioctl_fitrim(struct ntfs_sb_info *sbi, unsigned long arg)

{

	struct fstrim_range __user *user_range;
@@ -73,13 +79,47 @@ static int ntfs_ioctl_set_volume_label(struct ntfs_sb_info *sbi, u8 __user *buf) 
	return ntfs_set_label(sbi, user, len);

}



/*

 * ntfs_force_shutdown - helper function. Called from ioctl

 */

static int ntfs_force_shutdown(struct super_block *sb, u32 flags)

{

	int err;

	struct ntfs_sb_info *sbi = sb->s_fs_info;



	if (unlikely(ntfs3_forced_shutdown(sb)))

		return 0;



	/* No additional options yet (flags). */

	err = bdev_freeze(sb->s_bdev);

	if (err)

		return err;

	set_bit(NTFS_FLAGS_SHUTDOWN_BIT, &sbi->flags);

	bdev_thaw(sb->s_bdev);

	return 0;

}



static int ntfs_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 ntfs_force_shutdown(sb, flags);

}



/*

 * ntfs_ioctl - file_operations::unlocked_ioctl

 */

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;

	struct super_block *sb = inode->i_sb;

	struct ntfs_sb_info *sbi = sb->s_fs_info;



	/* Avoid any operation if inode is bad. */

	if (unlikely(is_bad_ni(ntfs_i(inode))))
@@ -92,6 +132,8 @@ long ntfs_ioctl(struct file *filp, u32 cmd, unsigned long arg) 
		return ntfs_ioctl_get_volume_label(sbi, (u8 __user *)arg);

	case FS_IOC_SETFSLABEL:

		return ntfs_ioctl_set_volume_label(sbi, (u8 __user *)arg);

	case NTFS3_IOC_SHUTDOWN:

		return ntfs_ioctl_shutdown(sb, arg);

	}

	return -ENOTTY; /* Inappropriate ioctl for device. */

}