155 строки
3.7 KiB
C
155 строки
3.7 KiB
C
// 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 <erbenson@alaska.net>
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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 (card@masi.ibp.fr)
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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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static inline unsigned int hfsplus_getflags(struct inode *inode)
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{
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struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
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unsigned int flags = 0;
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if (inode->i_flags & S_IMMUTABLE)
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flags |= FS_IMMUTABLE_FL;
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if (inode->i_flags & S_APPEND)
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flags |= FS_APPEND_FL;
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if (hip->userflags & HFSPLUS_FLG_NODUMP)
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flags |= FS_NODUMP_FL;
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return flags;
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}
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static int hfsplus_ioctl_getflags(struct file *file, int __user *user_flags)
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{
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struct inode *inode = file_inode(file);
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unsigned int flags = hfsplus_getflags(inode);
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return put_user(flags, user_flags);
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}
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static int hfsplus_ioctl_setflags(struct file *file, int __user *user_flags)
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{
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struct inode *inode = file_inode(file);
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struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
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unsigned int flags, new_fl = 0;
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unsigned int oldflags = hfsplus_getflags(inode);
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int err = 0;
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err = mnt_want_write_file(file);
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if (err)
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goto out;
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if (!inode_owner_or_capable(&init_user_ns, inode)) {
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err = -EACCES;
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goto out_drop_write;
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}
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if (get_user(flags, user_flags)) {
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err = -EFAULT;
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goto out_drop_write;
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}
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inode_lock(inode);
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err = vfs_ioc_setflags_prepare(inode, oldflags, flags);
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if (err)
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goto out_unlock_inode;
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/* don't silently ignore unsupported ext2 flags */
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if (flags & ~(FS_IMMUTABLE_FL|FS_APPEND_FL|FS_NODUMP_FL)) {
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err = -EOPNOTSUPP;
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goto out_unlock_inode;
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}
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if (flags & FS_IMMUTABLE_FL)
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new_fl |= S_IMMUTABLE;
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if (flags & FS_APPEND_FL)
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new_fl |= S_APPEND;
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inode_set_flags(inode, new_fl, S_IMMUTABLE | S_APPEND);
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if (flags & FS_NODUMP_FL)
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hip->userflags |= HFSPLUS_FLG_NODUMP;
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else
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hip->userflags &= ~HFSPLUS_FLG_NODUMP;
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inode->i_ctime = current_time(inode);
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mark_inode_dirty(inode);
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out_unlock_inode:
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inode_unlock(inode);
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out_drop_write:
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mnt_drop_write_file(file);
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out:
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return err;
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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_EXT2_GETFLAGS:
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return hfsplus_ioctl_getflags(file, argp);
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case HFSPLUS_IOC_EXT2_SETFLAGS:
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return hfsplus_ioctl_setflags(file, argp);
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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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