// SPDX-License-Identifier: GPL-2.0 /* * 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 <linux/uaccess.h> #include <linux/fileattr.h> int ext2_fileattr_get(struct dentry *dentry, struct fileattr *fa) { struct ext2_inode_info *ei = EXT2_I(d_inode(dentry)); fileattr_fill_flags(fa, ei->i_flags & EXT2_FL_USER_VISIBLE); return 0; } int ext2_fileattr_set(struct mnt_idmap *idmap, struct dentry *dentry, struct fileattr *fa) { struct inode *inode = d_inode(dentry); struct ext2_inode_info *ei = EXT2_I(inode); if (fileattr_has_fsx(fa)) return -EOPNOTSUPP; /* Is it quota file? Do not allow user to mess with it */ if (IS_NOQUOTA(inode)) return -EPERM; ei->i_flags = (ei->i_flags & ~EXT2_FL_USER_MODIFIABLE) | (fa->flags & EXT2_FL_USER_MODIFIABLE); ext2_set_inode_flags(inode); inode_set_ctime_current(inode); mark_inode_dirty(inode); return 0; } long ext2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) { struct inode *inode = file_inode(filp); struct ext2_inode_info *ei = EXT2_I(inode); unsigned short rsv_window_size; int ret; ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg); switch (cmd) { case EXT2_IOC_GETVERSION: return put_user(inode->i_generation, (int __user *) arg); case EXT2_IOC_SETVERSION: { __u32 generation; if (!inode_owner_or_capable(&nop_mnt_idmap, inode)) return -EPERM; ret = mnt_want_write_file(filp); if (ret) return ret; if (get_user(generation, (int __user *) arg)) { ret = -EFAULT; goto setversion_out; } inode_lock(inode); inode_set_ctime_current(inode); inode->i_generation = generation; inode_unlock(inode); mark_inode_dirty(inode); setversion_out: mnt_drop_write_file(filp); 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 (!inode_owner_or_capable(&nop_mnt_idmap, inode)) return -EACCES; if (get_user(rsv_window_size, (int __user *)arg)) return -EFAULT; ret = mnt_want_write_file(filp); 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; } else { ret = -ENOMEM; } mutex_unlock(&ei->truncate_mutex); mnt_drop_write_file(filp); return ret; } 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_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