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70 lines
1.8 KiB
70 lines
1.8 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* linux/fs/hfsplus/ioctl.c |
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* |
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* Copyright (C) 2003 |
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* Ethan Benson <[email protected]> |
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* partially derived from linux/fs/ext2/ioctl.c |
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* Copyright (C) 1993, 1994, 1995 |
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* Remy Card ([email protected]) |
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* Laboratoire MASI - Institut Blaise Pascal |
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* Universite Pierre et Marie Curie (Paris VI) |
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* |
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* hfsplus ioctls |
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*/ |
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#include <linux/capability.h> |
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#include <linux/fs.h> |
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#include <linux/mount.h> |
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#include <linux/sched.h> |
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#include <linux/uaccess.h> |
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#include "hfsplus_fs.h" |
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/* |
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* "Blessing" an HFS+ filesystem writes metadata to the superblock informing |
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* the platform firmware which file to boot from |
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*/ |
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static int hfsplus_ioctl_bless(struct file *file, int __user *user_flags) |
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{ |
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struct dentry *dentry = file->f_path.dentry; |
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struct inode *inode = d_inode(dentry); |
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struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb); |
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struct hfsplus_vh *vh = sbi->s_vhdr; |
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struct hfsplus_vh *bvh = sbi->s_backup_vhdr; |
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u32 cnid = (unsigned long)dentry->d_fsdata; |
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if (!capable(CAP_SYS_ADMIN)) |
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return -EPERM; |
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mutex_lock(&sbi->vh_mutex); |
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/* Directory containing the bootable system */ |
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vh->finder_info[0] = bvh->finder_info[0] = |
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cpu_to_be32(parent_ino(dentry)); |
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/* |
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* Bootloader. Just using the inode here breaks in the case of |
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* hard links - the firmware wants the ID of the hard link file, |
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* but the inode points at the indirect inode |
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*/ |
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vh->finder_info[1] = bvh->finder_info[1] = cpu_to_be32(cnid); |
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/* Per spec, the OS X system folder - same as finder_info[0] here */ |
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vh->finder_info[5] = bvh->finder_info[5] = |
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cpu_to_be32(parent_ino(dentry)); |
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mutex_unlock(&sbi->vh_mutex); |
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return 0; |
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} |
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long hfsplus_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
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{ |
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void __user *argp = (void __user *)arg; |
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switch (cmd) { |
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case HFSPLUS_IOC_BLESS: |
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return hfsplus_ioctl_bless(file, argp); |
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default: |
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return -ENOTTY; |
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} |
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}
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