265 lines
6.9 KiB
C
265 lines
6.9 KiB
C
/*
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* This file is part of UBIFS.
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*
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* Copyright (C) 2006-2008 Nokia Corporation.
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* Copyright (C) 2006, 2007 University of Szeged, Hungary
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 51
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* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Authors: Zoltan Sogor
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* Artem Bityutskiy (Битюцкий Артём)
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* Adrian Hunter
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*/
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/* This file implements EXT2-compatible extended attribute ioctl() calls */
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#include <linux/compat.h>
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#include <linux/mount.h>
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#include "ubifs.h"
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/* Need to be kept consistent with checked flags in ioctl2ubifs() */
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#define UBIFS_SUPPORTED_IOCTL_FLAGS \
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(FS_COMPR_FL | FS_SYNC_FL | FS_APPEND_FL | \
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FS_IMMUTABLE_FL | FS_DIRSYNC_FL)
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/**
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* ubifs_set_inode_flags - set VFS inode flags.
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* @inode: VFS inode to set flags for
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*
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* This function propagates flags from UBIFS inode object to VFS inode object.
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*/
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void ubifs_set_inode_flags(struct inode *inode)
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{
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unsigned int flags = ubifs_inode(inode)->flags;
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inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_DIRSYNC |
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S_ENCRYPTED);
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if (flags & UBIFS_SYNC_FL)
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inode->i_flags |= S_SYNC;
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if (flags & UBIFS_APPEND_FL)
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inode->i_flags |= S_APPEND;
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if (flags & UBIFS_IMMUTABLE_FL)
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inode->i_flags |= S_IMMUTABLE;
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if (flags & UBIFS_DIRSYNC_FL)
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inode->i_flags |= S_DIRSYNC;
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if (flags & UBIFS_CRYPT_FL)
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inode->i_flags |= S_ENCRYPTED;
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}
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/*
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* ioctl2ubifs - convert ioctl inode flags to UBIFS inode flags.
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* @ioctl_flags: flags to convert
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*
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* This function converts ioctl flags (@FS_COMPR_FL, etc) to UBIFS inode flags
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* (@UBIFS_COMPR_FL, etc).
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*/
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static int ioctl2ubifs(int ioctl_flags)
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{
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int ubifs_flags = 0;
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if (ioctl_flags & FS_COMPR_FL)
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ubifs_flags |= UBIFS_COMPR_FL;
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if (ioctl_flags & FS_SYNC_FL)
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ubifs_flags |= UBIFS_SYNC_FL;
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if (ioctl_flags & FS_APPEND_FL)
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ubifs_flags |= UBIFS_APPEND_FL;
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if (ioctl_flags & FS_IMMUTABLE_FL)
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ubifs_flags |= UBIFS_IMMUTABLE_FL;
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if (ioctl_flags & FS_DIRSYNC_FL)
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ubifs_flags |= UBIFS_DIRSYNC_FL;
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return ubifs_flags;
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}
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/*
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* ubifs2ioctl - convert UBIFS inode flags to ioctl inode flags.
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* @ubifs_flags: flags to convert
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*
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* This function converts UBIFS inode flags (@UBIFS_COMPR_FL, etc) to ioctl
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* flags (@FS_COMPR_FL, etc).
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*/
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static int ubifs2ioctl(int ubifs_flags)
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{
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int ioctl_flags = 0;
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if (ubifs_flags & UBIFS_COMPR_FL)
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ioctl_flags |= FS_COMPR_FL;
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if (ubifs_flags & UBIFS_SYNC_FL)
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ioctl_flags |= FS_SYNC_FL;
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if (ubifs_flags & UBIFS_APPEND_FL)
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ioctl_flags |= FS_APPEND_FL;
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if (ubifs_flags & UBIFS_IMMUTABLE_FL)
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ioctl_flags |= FS_IMMUTABLE_FL;
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if (ubifs_flags & UBIFS_DIRSYNC_FL)
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ioctl_flags |= FS_DIRSYNC_FL;
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return ioctl_flags;
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}
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static int setflags(struct inode *inode, int flags)
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{
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int oldflags, err, release;
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struct ubifs_inode *ui = ubifs_inode(inode);
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struct ubifs_info *c = inode->i_sb->s_fs_info;
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struct ubifs_budget_req req = { .dirtied_ino = 1,
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.dirtied_ino_d = ui->data_len };
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err = ubifs_budget_space(c, &req);
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if (err)
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return err;
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/*
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* The IMMUTABLE and APPEND_ONLY flags can only be changed by
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* the relevant capability.
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*/
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mutex_lock(&ui->ui_mutex);
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oldflags = ubifs2ioctl(ui->flags);
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if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
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if (!capable(CAP_LINUX_IMMUTABLE)) {
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err = -EPERM;
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goto out_unlock;
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}
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}
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ui->flags &= ~ioctl2ubifs(UBIFS_SUPPORTED_IOCTL_FLAGS);
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ui->flags |= ioctl2ubifs(flags);
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ubifs_set_inode_flags(inode);
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inode->i_ctime = current_time(inode);
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release = ui->dirty;
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mark_inode_dirty_sync(inode);
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mutex_unlock(&ui->ui_mutex);
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if (release)
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ubifs_release_budget(c, &req);
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if (IS_SYNC(inode))
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err = write_inode_now(inode, 1);
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return err;
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out_unlock:
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ubifs_err(c, "can't modify inode %lu attributes", inode->i_ino);
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mutex_unlock(&ui->ui_mutex);
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ubifs_release_budget(c, &req);
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return err;
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}
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long ubifs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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int flags, err;
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struct inode *inode = file_inode(file);
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switch (cmd) {
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case FS_IOC_GETFLAGS:
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flags = ubifs2ioctl(ubifs_inode(inode)->flags);
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dbg_gen("get flags: %#x, i_flags %#x", flags, inode->i_flags);
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return put_user(flags, (int __user *) arg);
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case FS_IOC_SETFLAGS: {
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if (IS_RDONLY(inode))
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return -EROFS;
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if (!inode_owner_or_capable(inode))
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return -EACCES;
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if (get_user(flags, (int __user *) arg))
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return -EFAULT;
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if (flags & ~UBIFS_SUPPORTED_IOCTL_FLAGS)
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return -EOPNOTSUPP;
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if (!S_ISDIR(inode->i_mode))
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flags &= ~FS_DIRSYNC_FL;
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/*
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* Make sure the file-system is read-write and make sure it
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* will not become read-only while we are changing the flags.
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*/
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err = mnt_want_write_file(file);
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if (err)
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return err;
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dbg_gen("set flags: %#x, i_flags %#x", flags, inode->i_flags);
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err = setflags(inode, flags);
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mnt_drop_write_file(file);
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return err;
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}
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case FS_IOC_SET_ENCRYPTION_POLICY: {
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#ifdef CONFIG_FS_ENCRYPTION
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struct ubifs_info *c = inode->i_sb->s_fs_info;
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err = ubifs_enable_encryption(c);
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if (err)
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return err;
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return fscrypt_ioctl_set_policy(file, (const void __user *)arg);
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#else
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return -EOPNOTSUPP;
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#endif
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}
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case FS_IOC_GET_ENCRYPTION_POLICY: {
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#ifdef CONFIG_FS_ENCRYPTION
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return fscrypt_ioctl_get_policy(file, (void __user *)arg);
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#else
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return -EOPNOTSUPP;
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#endif
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}
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case FS_IOC_GET_ENCRYPTION_POLICY_EX:
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return fscrypt_ioctl_get_policy_ex(file, (void __user *)arg);
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case FS_IOC_ADD_ENCRYPTION_KEY:
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return fscrypt_ioctl_add_key(file, (void __user *)arg);
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case FS_IOC_REMOVE_ENCRYPTION_KEY:
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return fscrypt_ioctl_remove_key(file, (void __user *)arg);
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case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS:
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return fscrypt_ioctl_remove_key_all_users(file,
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(void __user *)arg);
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case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
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return fscrypt_ioctl_get_key_status(file, (void __user *)arg);
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case FS_IOC_GET_ENCRYPTION_NONCE:
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return fscrypt_ioctl_get_nonce(file, (void __user *)arg);
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default:
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return -ENOTTY;
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}
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}
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#ifdef CONFIG_COMPAT
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long ubifs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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switch (cmd) {
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case FS_IOC32_GETFLAGS:
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cmd = FS_IOC_GETFLAGS;
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break;
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case FS_IOC32_SETFLAGS:
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cmd = FS_IOC_SETFLAGS;
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break;
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case FS_IOC_SET_ENCRYPTION_POLICY:
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case FS_IOC_GET_ENCRYPTION_POLICY:
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case FS_IOC_GET_ENCRYPTION_POLICY_EX:
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case FS_IOC_ADD_ENCRYPTION_KEY:
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case FS_IOC_REMOVE_ENCRYPTION_KEY:
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case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS:
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case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
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case FS_IOC_GET_ENCRYPTION_NONCE:
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break;
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default:
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return -ENOIOCTLCMD;
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}
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return ubifs_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
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}
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#endif
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