| 1 | |
| 2 | |
| 3 | * linux/fs/hfsplus/ioctl.c
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| 4 | *
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| 5 | * Copyright (C) 2003
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| 6 | * Ethan Benson <[email protected]>
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| 7 | * partially derived from linux/fs/ext2/ioctl.c
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| 8 | * Copyright (C) 1993, 1994, 1995
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| 9 | * Remy Card ([email protected])
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| 10 | * Laboratoire MASI - Institut Blaise Pascal
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| 11 | * Universite Pierre et Marie Curie (Paris VI)
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| 12 | *
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| 13 | * hfsplus ioctls
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| 14 |
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| 15 |
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| 16 | #include <linux/capability.h>
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| 17 | #include <linux/fs.h>
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| 18 | #include <linux/mount.h>
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| 19 | #include <linux/sched.h>
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| 20 | #include <linux/uaccess.h>
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| 21 | #include "hfsplus_fs.h"
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| 22 |
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| 23 | |
| 24 | * "Blessing" an HFS+ filesystem writes metadata to the superblock informing
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| 25 | * the platform firmware which file to boot from
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| 26 |
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| 27 | static int hfsplus_ioctl_bless(struct file *file, int __user *user_flags)
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| 28 | {
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| 29 | struct dentry *dentry = file->f_path.dentry;
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| 30 | struct inode *inode = d_inode(dentry);
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| 31 | struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
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| 32 | struct hfsplus_vh *vh = sbi->s_vhdr;
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| 33 | struct hfsplus_vh *bvh = sbi->s_backup_vhdr;
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| 34 | u32 cnid = (unsigned long)dentry->d_fsdata;
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| 35 |
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| 36 | if (!capable(CAP_SYS_ADMIN))
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| 37 | return -EPERM;
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| 38 |
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| 39 | mutex_lock(&sbi->vh_mutex);
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| 40 |
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| 41 |
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| 42 | vh->finder_info[0] = bvh->finder_info[0] =
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| 43 | cpu_to_be32(d_parent_ino(dentry));
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| 44 |
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| 45 | |
| 46 | * Bootloader. Just using the inode here breaks in the case of
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| 47 | * hard links - the firmware wants the ID of the hard link file,
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| 48 | * but the inode points at the indirect inode
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| 49 |
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| 50 | vh->finder_info[1] = bvh->finder_info[1] = cpu_to_be32(cnid);
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| 51 |
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| 52 |
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| 53 | vh->finder_info[5] = bvh->finder_info[5] =
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| 54 | cpu_to_be32(d_parent_ino(dentry));
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| 55 |
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| 56 | mutex_unlock(&sbi->vh_mutex);
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| 57 | return 0;
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| 58 | }
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| 59 |
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| 60 | long hfsplus_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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| 61 | {
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| 62 | void __user *argp = (void __user *)arg;
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| 63 |
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| 64 | switch (cmd) {
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| 65 | case HFSPLUS_IOC_BLESS:
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| 66 | return hfsplus_ioctl_bless(file, argp);
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| 67 | default:
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| 68 | return -ENOTTY;
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| 69 | }
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| 70 | }
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