/* * 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/mount.h> #include <asm/current.h> #include <asm/uaccess.h> long ext2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) { struct inode *inode = filp->f_dentry->d_inode; struct ext2_inode_info *ei = EXT2_I(inode); unsigned int flags; unsigned short rsv_window_size; int ret; ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg); switch (cmd) { case EXT2_IOC_GETFLAGS: ext2_get_inode_flags(ei); flags = ei->i_flags & EXT2_FL_USER_VISIBLE; return put_user(flags, (int __user *) arg); case EXT2_IOC_SETFLAGS: { unsigned int oldflags; ret = mnt_want_write(filp->f_path.mnt); if (ret) return ret; if (!is_owner_or_cap(inode)) { ret = -EACCES; goto setflags_out; } if (get_user(flags, (int __user *) arg)) { ret = -EFAULT; goto setflags_out; } flags = ext2_mask_flags(inode->i_mode, flags); mutex_lock(&inode->i_mutex); /* Is it quota file? Do not allow user to mess with it */ if (IS_NOQUOTA(inode)) { mutex_unlock(&inode->i_mutex); ret = -EPERM; goto setflags_out; } 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); ret = -EPERM; goto setflags_out; } } 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); setflags_out: mnt_drop_write(filp->f_path.mnt); return ret; } case EXT2_IOC_GETVERSION: return put_user(inode->i_generation, (int __user *) arg); case EXT2_IOC_SETVERSION: if (!is_owner_or_cap(inode)) return -EPERM; ret = mnt_want_write(filp->f_path.mnt); if (ret) return ret; if (get_user(inode->i_generation, (int __user *) arg)) { ret = -EFAULT; } else { inode->i_ctime = CURRENT_TIME_SEC; mark_inode_dirty(inode); } mnt_drop_write(filp->f_path.mnt); return ret; case EXT2_IOC_GETRSVSZ: if (test_opt(inode->i_sb, RESERVATION) && S_ISREG(inode->i_mode) && ei->i_block_alloc_info) { rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size; return put_user(rsv_window_size, (int __user *)arg); } return -ENOTTY; case EXT2_IOC_SETRSVSZ: { if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode)) return -ENOTTY; if (!is_owner_or_cap(inode)) return -EACCES; if (get_user(rsv_window_size, (int __user *)arg)) return -EFAULT; ret = mnt_want_write(filp->f_path.mnt); if (ret) return ret; if (rsv_window_size > EXT2_MAX_RESERVE_BLOCKS) rsv_window_size = EXT2_MAX_RESERVE_BLOCKS; /* * need to allocate reservation structure for this inode * before set the window size */ /* * XXX What lock should protect the rsv_goal_size? * Accessed in ext2_get_block only. ext3 uses i_truncate. */ mutex_lock(&ei->truncate_mutex); if (!ei->i_block_alloc_info) ext2_init_block_alloc_info(inode); if (ei->i_block_alloc_info){ struct ext2_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node; rsv->rsv_goal_size = rsv_window_size; } mutex_unlock(&ei->truncate_mutex); mnt_drop_write(filp->f_path.mnt); return 0; } default: return -ENOTTY; } } #ifdef CONFIG_COMPAT long ext2_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { /* 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; } return ext2_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); } #endif