11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * linux/fs/ext2/ioctl.c 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (C) 1993, 1994, 1995 51da177e4SLinus Torvalds * Remy Card (card@masi.ibp.fr) 61da177e4SLinus Torvalds * Laboratoire MASI - Institut Blaise Pascal 71da177e4SLinus Torvalds * Universite Pierre et Marie Curie (Paris VI) 81da177e4SLinus Torvalds */ 91da177e4SLinus Torvalds 101da177e4SLinus Torvalds #include "ext2.h" 111da177e4SLinus Torvalds #include <linux/time.h> 121da177e4SLinus Torvalds #include <linux/sched.h> 131da177e4SLinus Torvalds #include <asm/current.h> 141da177e4SLinus Torvalds #include <asm/uaccess.h> 151da177e4SLinus Torvalds 161da177e4SLinus Torvalds 171da177e4SLinus Torvalds int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd, 181da177e4SLinus Torvalds unsigned long arg) 191da177e4SLinus Torvalds { 201da177e4SLinus Torvalds struct ext2_inode_info *ei = EXT2_I(inode); 211da177e4SLinus Torvalds unsigned int flags; 221da177e4SLinus Torvalds 231da177e4SLinus Torvalds ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg); 241da177e4SLinus Torvalds 251da177e4SLinus Torvalds switch (cmd) { 261da177e4SLinus Torvalds case EXT2_IOC_GETFLAGS: 271da177e4SLinus Torvalds flags = ei->i_flags & EXT2_FL_USER_VISIBLE; 281da177e4SLinus Torvalds return put_user(flags, (int __user *) arg); 291da177e4SLinus Torvalds case EXT2_IOC_SETFLAGS: { 301da177e4SLinus Torvalds unsigned int oldflags; 311da177e4SLinus Torvalds 321da177e4SLinus Torvalds if (IS_RDONLY(inode)) 331da177e4SLinus Torvalds return -EROFS; 341da177e4SLinus Torvalds 351da177e4SLinus Torvalds if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER)) 361da177e4SLinus Torvalds return -EACCES; 371da177e4SLinus Torvalds 381da177e4SLinus Torvalds if (get_user(flags, (int __user *) arg)) 391da177e4SLinus Torvalds return -EFAULT; 401da177e4SLinus Torvalds 411da177e4SLinus Torvalds if (!S_ISDIR(inode->i_mode)) 421da177e4SLinus Torvalds flags &= ~EXT2_DIRSYNC_FL; 431da177e4SLinus Torvalds 441da177e4SLinus Torvalds oldflags = ei->i_flags; 451da177e4SLinus Torvalds 461da177e4SLinus Torvalds /* 471da177e4SLinus Torvalds * The IMMUTABLE and APPEND_ONLY flags can only be changed by 481da177e4SLinus Torvalds * the relevant capability. 491da177e4SLinus Torvalds * 501da177e4SLinus Torvalds * This test looks nicer. Thanks to Pauline Middelink 511da177e4SLinus Torvalds */ 521da177e4SLinus Torvalds if ((flags ^ oldflags) & (EXT2_APPEND_FL | EXT2_IMMUTABLE_FL)) { 531da177e4SLinus Torvalds if (!capable(CAP_LINUX_IMMUTABLE)) 541da177e4SLinus Torvalds return -EPERM; 551da177e4SLinus Torvalds } 561da177e4SLinus Torvalds 571da177e4SLinus Torvalds flags = flags & EXT2_FL_USER_MODIFIABLE; 581da177e4SLinus Torvalds flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE; 591da177e4SLinus Torvalds ei->i_flags = flags; 601da177e4SLinus Torvalds 611da177e4SLinus Torvalds ext2_set_inode_flags(inode); 621da177e4SLinus Torvalds inode->i_ctime = CURRENT_TIME_SEC; 631da177e4SLinus Torvalds mark_inode_dirty(inode); 641da177e4SLinus Torvalds return 0; 651da177e4SLinus Torvalds } 661da177e4SLinus Torvalds case EXT2_IOC_GETVERSION: 671da177e4SLinus Torvalds return put_user(inode->i_generation, (int __user *) arg); 681da177e4SLinus Torvalds case EXT2_IOC_SETVERSION: 691da177e4SLinus Torvalds if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER)) 701da177e4SLinus Torvalds return -EPERM; 711da177e4SLinus Torvalds if (IS_RDONLY(inode)) 721da177e4SLinus Torvalds return -EROFS; 731da177e4SLinus Torvalds if (get_user(inode->i_generation, (int __user *) arg)) 741da177e4SLinus Torvalds return -EFAULT; 751da177e4SLinus Torvalds inode->i_ctime = CURRENT_TIME_SEC; 761da177e4SLinus Torvalds mark_inode_dirty(inode); 771da177e4SLinus Torvalds return 0; 781da177e4SLinus Torvalds default: 791da177e4SLinus Torvalds return -ENOTTY; 801da177e4SLinus Torvalds } 811da177e4SLinus Torvalds } 82