1/* 2 * linux/fs/ext2/ioctl.c 3 * 4 * Copyright (C) 1993, 1994, 1995 5 * Remy Card (card@masi.ibp.fr) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 */ 9 10#include <linux/fs.h> 11#include <linux/ext2_fs.h> 12#include <linux/sched.h> 13#include <asm/uaccess.h> 14 15 16int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd, 17 unsigned long arg) 18{ 19 unsigned int flags; 20 21 ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg); 22 23 switch (cmd) { 24 case EXT2_IOC_GETFLAGS: 25 flags = inode->u.ext2_i.i_flags & EXT2_FL_USER_VISIBLE; 26 return put_user(flags, (int *) arg); 27 case EXT2_IOC_SETFLAGS: { 28 unsigned int oldflags; 29 30 if (IS_RDONLY(inode)) 31 return -EROFS; 32 33 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER)) 34 return -EACCES; 35 36 if (get_user(flags, (int *) arg)) 37 return -EFAULT; 38 39 oldflags = inode->u.ext2_i.i_flags; 40 41 /* 42 * The IMMUTABLE and APPEND_ONLY flags can only be changed by 43 * the relevant capability. 44 * 45 * This test looks nicer. Thanks to Pauline Middelink 46 */ 47 if ((flags ^ oldflags) & (EXT2_APPEND_FL | EXT2_IMMUTABLE_FL)) { 48 if (!capable(CAP_LINUX_IMMUTABLE)) 49 return -EPERM; 50 } 51 52 flags = flags & EXT2_FL_USER_MODIFIABLE; 53 flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE; 54 inode->u.ext2_i.i_flags = flags; 55 56 if (flags & EXT2_SYNC_FL) 57 inode->i_flags |= S_SYNC; 58 else 59 inode->i_flags &= ~S_SYNC; 60 if (flags & EXT2_APPEND_FL) 61 inode->i_flags |= S_APPEND; 62 else 63 inode->i_flags &= ~S_APPEND; 64 if (flags & EXT2_IMMUTABLE_FL) 65 inode->i_flags |= S_IMMUTABLE; 66 else 67 inode->i_flags &= ~S_IMMUTABLE; 68 if (flags & EXT2_NOATIME_FL) 69 inode->i_flags |= S_NOATIME; 70 else 71 inode->i_flags &= ~S_NOATIME; 72 inode->i_ctime = CURRENT_TIME; 73 mark_inode_dirty(inode); 74 return 0; 75 } 76 case EXT2_IOC_GETVERSION: 77 return put_user(inode->i_generation, (int *) arg); 78 case EXT2_IOC_SETVERSION: 79 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER)) 80 return -EPERM; 81 if (IS_RDONLY(inode)) 82 return -EROFS; 83 if (get_user(inode->i_generation, (int *) arg)) 84 return -EFAULT; 85 inode->i_ctime = CURRENT_TIME; 86 mark_inode_dirty(inode); 87 return 0; 88 default: 89 return -ENOTTY; 90 } 91} 92