/* * 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 <linux/fs.h> #include <linux/ext2_fs.h> #include <linux/sched.h> 13 #include <asm/uaccess.h> int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd, unsigned long arg) { 19 unsigned int flags; 20 ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg); switch (cmd) { 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)) return -EROFS; 33 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER)) return -EPERM; 35 36 if (get_user(flags, (int *) arg)) 37 return -EFAULT; 38 39 oldflags = inode->u.ext2_i.i_flags; 40 /* 42 * The IMMUTABLE and APPEND_ONLY flags can only be changed by 43 * the relevant capability. 44 * * This test looks nicer. Thanks to Pauline Middelink */ if ((flags ^ oldflags) & (EXT2_APPEND_FL | EXT2_IMMUTABLE_FL)) { 48 if (!capable(CAP_LINUX_IMMUTABLE)) return -EPERM; } flags = flags & EXT2_FL_USER_MODIFIABLE; flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE; inode->u.ext2_i.i_flags = flags; 55 56 if (flags & EXT2_SYNC_FL) inode->i_flags |= S_SYNC; 58 else 59 inode->i_flags &= ~S_SYNC; 60 if (flags & EXT2_APPEND_FL) inode->i_flags |= S_APPEND; 62 else inode->i_flags &= ~S_APPEND; 64 if (flags & EXT2_IMMUTABLE_FL) inode->i_flags |= S_IMMUTABLE; 66 else inode->i_flags &= ~S_IMMUTABLE; 68 if (flags & EXT2_NOATIME_FL) 69 inode->i_flags |= S_NOATIME; 70 else inode->i_flags &= ~S_NOATIME; inode->i_ctime = CURRENT_TIME; mark_inode_dirty(inode); return 0; } case EXT2_IOC_GETVERSION: 77 return put_user(inode->i_generation, (int *) arg); case EXT2_IOC_SETVERSION: 79 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER)) return -EPERM; 81 if (IS_RDONLY(inode)) return -EROFS; 83 if (get_user(inode->i_generation, (int *) arg)) 84 return -EFAULT; 85 inode->i_ctime = CURRENT_TIME; mark_inode_dirty(inode); return 0; default: 89 return -ENOTTY; 90 } }