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