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* This file is part of UBIFS.
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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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* 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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* 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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* 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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* Authors: Zoltan Sogor
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* Artem Bityutskiy (Битюцкий Артём)
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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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* ubifs_set_inode_flags - set VFS inode flags.
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* @inode: VFS inode to set flags for
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* This function propagates flags from UBIFS inode object to VFS inode object.
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void ubifs_set_inode_flags(struct inode *inode)
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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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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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* ioctl2ubifs - convert ioctl inode flags to UBIFS inode flags.
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* @ioctl_flags: flags to convert
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* This function convert ioctl flags (@FS_COMPR_FL, etc) to UBIFS inode flags
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* (@UBIFS_COMPR_FL, etc).
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static int ioctl2ubifs(int ioctl_flags)
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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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* ubifs2ioctl - convert UBIFS inode flags to ioctl inode flags.
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* @ubifs_flags: flags to convert
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* This function convert UBIFS (@UBIFS_COMPR_FL, etc) to ioctl flags
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* (@FS_COMPR_FL, etc).
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static int ubifs2ioctl(int ubifs_flags)
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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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static int setflags(struct inode *inode, int flags)
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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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* The IMMUTABLE and APPEND_ONLY flags can only be changed by
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* the relevant capability.
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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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ui->flags = ioctl2ubifs(flags);
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ubifs_set_inode_flags(inode);
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inode->i_ctime = ubifs_current_time(inode);
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mark_inode_dirty_sync(inode);
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mutex_unlock(&ui->ui_mutex);
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ubifs_release_budget(c, &req);
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err = write_inode_now(inode, 1);
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ubifs_err("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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long ubifs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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struct inode *inode = file->f_path.dentry->d_inode;
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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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if (!inode_owner_or_capable(inode))
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if (get_user(flags, (int __user *) arg))
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if (!S_ISDIR(inode->i_mode))
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flags &= ~FS_DIRSYNC_FL;
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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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err = mnt_want_write(file->f_path.mnt);
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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->f_path.mnt);
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long ubifs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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case FS_IOC32_GETFLAGS:
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cmd = FS_IOC_GETFLAGS;
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case FS_IOC32_SETFLAGS:
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cmd = FS_IOC_SETFLAGS;
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return ubifs_ioctl(file, cmd, (unsigned long)compat_ptr(arg));