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/* * 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> #include <asm/uaccess.h> int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd, unsigned long arg) { unsigned int flags; ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg); switch (cmd) { case EXT2_IOC_GETFLAGS: flags = inode->u.ext2_i.i_flags & EXT2_FL_USER_VISIBLE; return put_user(flags, (int *) arg); case EXT2_IOC_SETFLAGS: { unsigned int oldflags; if (IS_RDONLY(inode)) return -EROFS; if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER)) return -EPERM; if (get_user(flags, (int *) arg)) return -EFAULT; oldflags = inode->u.ext2_i.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)) return -EPERM; } flags = flags & EXT2_FL_USER_MODIFIABLE; flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE; inode->u.ext2_i.i_flags = flags; if (flags & EXT2_SYNC_FL) inode->i_flags |= S_SYNC; else inode->i_flags &= ~S_SYNC; if (flags & EXT2_APPEND_FL) inode->i_flags |= S_APPEND; else inode->i_flags &= ~S_APPEND; if (flags & EXT2_IMMUTABLE_FL) inode->i_flags |= S_IMMUTABLE; else inode->i_flags &= ~S_IMMUTABLE; if (flags & EXT2_NOATIME_FL) inode->i_flags |= S_NOATIME; else inode->i_flags &= ~S_NOATIME; inode->i_ctime = CURRENT_TIME; mark_inode_dirty(inode); return 0; } case EXT2_IOC_GETVERSION: return put_user(inode->i_generation, (int *) 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 *) arg)) return -EFAULT; inode->i_ctime = CURRENT_TIME; mark_inode_dirty(inode); return 0; default: return -ENOTTY; } } |