diff options
| -rw-r--r-- | fs/ntfs3/file.c | 44 |
1 files changed, 43 insertions, 1 deletions
diff --git a/fs/ntfs3/file.c b/fs/ntfs3/file.c index 60eb90bff955..b9484f48db34 100644 --- a/fs/ntfs3/file.c +++ b/fs/ntfs3/file.c @@ -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; @@ -74,12 +80,46 @@ static int ntfs_ioctl_set_volume_label(struct ntfs_sb_info *sbi, u8 __user *buf) } /* + * 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. */ } |