| 1 | /* |
| 2 | * linux/fs/hfsplus/ioctl.c |
| 3 | * |
| 4 | * Copyright (C) 2003 |
| 5 | * Ethan Benson <erbenson@alaska.net> |
| 6 | * partially derived from linux/fs/ext2/ioctl.c |
| 7 | * Copyright (C) 1993, 1994, 1995 |
| 8 | * Remy Card (card@masi.ibp.fr) |
| 9 | * Laboratoire MASI - Institut Blaise Pascal |
| 10 | * Universite Pierre et Marie Curie (Paris VI) |
| 11 | * |
| 12 | * hfsplus ioctls |
| 13 | */ |
| 14 | |
| 15 | #include <linux/capability.h> |
| 16 | #include <linux/fs.h> |
| 17 | #include <linux/mount.h> |
| 18 | #include <linux/sched.h> |
| 19 | #include <asm/uaccess.h> |
| 20 | #include "hfsplus_fs.h" |
| 21 | |
| 22 | /* |
| 23 | * "Blessing" an HFS+ filesystem writes metadata to the superblock informing |
| 24 | * the platform firmware which file to boot from |
| 25 | */ |
| 26 | static int hfsplus_ioctl_bless(struct file *file, int __user *user_flags) |
| 27 | { |
| 28 | struct dentry *dentry = file->f_path.dentry; |
| 29 | struct inode *inode = dentry->d_inode; |
| 30 | struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb); |
| 31 | struct hfsplus_vh *vh = sbi->s_vhdr; |
| 32 | struct hfsplus_vh *bvh = sbi->s_backup_vhdr; |
| 33 | u32 cnid = (unsigned long)dentry->d_fsdata; |
| 34 | |
| 35 | if (!capable(CAP_SYS_ADMIN)) |
| 36 | return -EPERM; |
| 37 | |
| 38 | mutex_lock(&sbi->vh_mutex); |
| 39 | |
| 40 | /* Directory containing the bootable system */ |
| 41 | vh->finder_info[0] = bvh->finder_info[0] = |
| 42 | cpu_to_be32(parent_ino(dentry)); |
| 43 | |
| 44 | /* |
| 45 | * Bootloader. Just using the inode here breaks in the case of |
| 46 | * hard links - the firmware wants the ID of the hard link file, |
| 47 | * but the inode points at the indirect inode |
| 48 | */ |
| 49 | vh->finder_info[1] = bvh->finder_info[1] = cpu_to_be32(cnid); |
| 50 | |
| 51 | /* Per spec, the OS X system folder - same as finder_info[0] here */ |
| 52 | vh->finder_info[5] = bvh->finder_info[5] = |
| 53 | cpu_to_be32(parent_ino(dentry)); |
| 54 | |
| 55 | mutex_unlock(&sbi->vh_mutex); |
| 56 | return 0; |
| 57 | } |
| 58 | |
| 59 | static int hfsplus_ioctl_getflags(struct file *file, int __user *user_flags) |
| 60 | { |
| 61 | struct inode *inode = file_inode(file); |
| 62 | struct hfsplus_inode_info *hip = HFSPLUS_I(inode); |
| 63 | unsigned int flags = 0; |
| 64 | |
| 65 | if (inode->i_flags & S_IMMUTABLE) |
| 66 | flags |= FS_IMMUTABLE_FL; |
| 67 | if (inode->i_flags & S_APPEND) |
| 68 | flags |= FS_APPEND_FL; |
| 69 | if (hip->userflags & HFSPLUS_FLG_NODUMP) |
| 70 | flags |= FS_NODUMP_FL; |
| 71 | |
| 72 | return put_user(flags, user_flags); |
| 73 | } |
| 74 | |
| 75 | static int hfsplus_ioctl_setflags(struct file *file, int __user *user_flags) |
| 76 | { |
| 77 | struct inode *inode = file_inode(file); |
| 78 | struct hfsplus_inode_info *hip = HFSPLUS_I(inode); |
| 79 | unsigned int flags; |
| 80 | int err = 0; |
| 81 | |
| 82 | err = mnt_want_write_file(file); |
| 83 | if (err) |
| 84 | goto out; |
| 85 | |
| 86 | if (!inode_owner_or_capable(inode)) { |
| 87 | err = -EACCES; |
| 88 | goto out_drop_write; |
| 89 | } |
| 90 | |
| 91 | if (get_user(flags, user_flags)) { |
| 92 | err = -EFAULT; |
| 93 | goto out_drop_write; |
| 94 | } |
| 95 | |
| 96 | mutex_lock(&inode->i_mutex); |
| 97 | |
| 98 | if ((flags & (FS_IMMUTABLE_FL|FS_APPEND_FL)) || |
| 99 | inode->i_flags & (S_IMMUTABLE|S_APPEND)) { |
| 100 | if (!capable(CAP_LINUX_IMMUTABLE)) { |
| 101 | err = -EPERM; |
| 102 | goto out_unlock_inode; |
| 103 | } |
| 104 | } |
| 105 | |
| 106 | /* don't silently ignore unsupported ext2 flags */ |
| 107 | if (flags & ~(FS_IMMUTABLE_FL|FS_APPEND_FL|FS_NODUMP_FL)) { |
| 108 | err = -EOPNOTSUPP; |
| 109 | goto out_unlock_inode; |
| 110 | } |
| 111 | |
| 112 | if (flags & FS_IMMUTABLE_FL) |
| 113 | inode->i_flags |= S_IMMUTABLE; |
| 114 | else |
| 115 | inode->i_flags &= ~S_IMMUTABLE; |
| 116 | |
| 117 | if (flags & FS_APPEND_FL) |
| 118 | inode->i_flags |= S_APPEND; |
| 119 | else |
| 120 | inode->i_flags &= ~S_APPEND; |
| 121 | |
| 122 | if (flags & FS_NODUMP_FL) |
| 123 | hip->userflags |= HFSPLUS_FLG_NODUMP; |
| 124 | else |
| 125 | hip->userflags &= ~HFSPLUS_FLG_NODUMP; |
| 126 | |
| 127 | inode->i_ctime = CURRENT_TIME_SEC; |
| 128 | mark_inode_dirty(inode); |
| 129 | |
| 130 | out_unlock_inode: |
| 131 | mutex_unlock(&inode->i_mutex); |
| 132 | out_drop_write: |
| 133 | mnt_drop_write_file(file); |
| 134 | out: |
| 135 | return err; |
| 136 | } |
| 137 | |
| 138 | long hfsplus_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
| 139 | { |
| 140 | void __user *argp = (void __user *)arg; |
| 141 | |
| 142 | switch (cmd) { |
| 143 | case HFSPLUS_IOC_EXT2_GETFLAGS: |
| 144 | return hfsplus_ioctl_getflags(file, argp); |
| 145 | case HFSPLUS_IOC_EXT2_SETFLAGS: |
| 146 | return hfsplus_ioctl_setflags(file, argp); |
| 147 | case HFSPLUS_IOC_BLESS: |
| 148 | return hfsplus_ioctl_bless(file, argp); |
| 149 | default: |
| 150 | return -ENOTTY; |
| 151 | } |
| 152 | } |