/* * linux/fs/ext2/ioctl.c * * Copyright (C) 1993, 1994, 1995 * Remy Card (card@masi.ibp.fr) * Laboratoire MASI - Institut Blaise Pascal * Universite Pierre et Marie Curie (Paris VI) */ #include "ext2.h" #include <linux/capability.h> #include <linux/time.h> #include <linux/sched.h> #include <linux/compat.h> #include <linux/smp_lock.h> #include <asm/current.h> #include <asm/uaccess.h> int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd, unsigned long arg) { struct ext2_inode_info *ei = EXT2_I(inode); unsigned int flags; ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg); switch (cmd) { case EXT2_IOC_GETFLAGS: flags = ei->i_flags & EXT2_FL_USER_VISIBLE; return put_user(flags, (int __user *) arg); case EXT2_IOC_SETFLAGS: { unsigned int oldflags; if (IS_RDONLY(inode)) return -EROFS; if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER)) return -EACCES; if (get_user(flags, (int __user *) arg)) return -EFAULT; if (!S_ISDIR(inode->i_mode)) flags &= ~EXT2_DIRSYNC_FL; mutex_lock(&inode->i_mutex); oldflags = ei->i_flags; /* * The IMMUTABLE and APPEND_ONLY flags can only be changed by * the relevant capability. * * This test looks nicer. Thanks to Pauline Middelink */ if ((flags ^ oldflags) & (EXT2_APPEND_FL | EXT2_IMMUTABLE_FL)) { if (!capable(CAP_LINUX_IMMUTABLE)) { mutex_unlock(&inode->i_mutex); return -EPERM; } } flags = flags & EXT2_FL_USER_MODIFIABLE; flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE; ei->i_flags = flags; mutex_unlock(&inode->i_mutex); ext2_set_inode_flags(inode); inode->i_ctime = CURRENT_TIME_SEC; mark_inode_dirty(inode); return 0; } case EXT2_IOC_GETVERSION: return put_user(inode->i_generation, (int __user *) arg); case EXT2_IOC_SETVERSION: if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER)) return -EPERM; if (IS_RDONLY(inode)) return -EROFS; if (get_user(inode->i_generation, (int __user *) arg)) return -EFAULT; inode->i_ctime = CURRENT_TIME_SEC; mark_inode_dirty(inode); return 0; default: return -ENOTTY; } } #ifdef CONFIG_COMPAT long ext2_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { struct inode *inode = file->f_path.dentry->d_inode; int ret; /* These are just misnamed, they actually get/put from/to user an int */ switch (cmd) { case EXT2_IOC32_GETFLAGS: cmd = EXT2_IOC_GETFLAGS; break; case EXT2_IOC32_SETFLAGS: cmd = EXT2_IOC_SETFLAGS; break; case EXT2_IOC32_GETVERSION: cmd = EXT2_IOC_GETVERSION; break; case EXT2_IOC32_SETVERSION: cmd = EXT2_IOC_SETVERSION; break; default: return -ENOIOCTLCMD; } lock_kernel(); ret = ext2_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg)); unlock_kernel(); return ret; } #endif