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1// SPDX-License-Identifier: GPL-2.02/*3 * linux/fs/ext2/ioctl.c4 *5 * Copyright (C) 1993, 1994, 19956 * Remy Card (card@masi.ibp.fr)7 * Laboratoire MASI - Institut Blaise Pascal8 * Universite Pierre et Marie Curie (Paris VI)9 */10 11#include "ext2.h"12#include <linux/capability.h>13#include <linux/time.h>14#include <linux/sched.h>15#include <linux/compat.h>16#include <linux/mount.h>17#include <asm/current.h>18#include <linux/uaccess.h>19#include <linux/fileattr.h>20 21int ext2_fileattr_get(struct dentry *dentry, struct fileattr *fa)22{23 struct ext2_inode_info *ei = EXT2_I(d_inode(dentry));24 25 fileattr_fill_flags(fa, ei->i_flags & EXT2_FL_USER_VISIBLE);26 27 return 0;28}29 30int ext2_fileattr_set(struct mnt_idmap *idmap,31 struct dentry *dentry, struct fileattr *fa)32{33 struct inode *inode = d_inode(dentry);34 struct ext2_inode_info *ei = EXT2_I(inode);35 36 if (fileattr_has_fsx(fa))37 return -EOPNOTSUPP;38 39 /* Is it quota file? Do not allow user to mess with it */40 if (IS_NOQUOTA(inode))41 return -EPERM;42 43 ei->i_flags = (ei->i_flags & ~EXT2_FL_USER_MODIFIABLE) |44 (fa->flags & EXT2_FL_USER_MODIFIABLE);45 46 ext2_set_inode_flags(inode);47 inode_set_ctime_current(inode);48 mark_inode_dirty(inode);49 50 return 0;51}52 53 54long ext2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)55{56 struct inode *inode = file_inode(filp);57 struct ext2_inode_info *ei = EXT2_I(inode);58 unsigned short rsv_window_size;59 int ret;60 61 ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg);62 63 switch (cmd) {64 case EXT2_IOC_GETVERSION:65 return put_user(inode->i_generation, (int __user *) arg);66 case EXT2_IOC_SETVERSION: {67 __u32 generation;68 69 if (!inode_owner_or_capable(&nop_mnt_idmap, inode))70 return -EPERM;71 ret = mnt_want_write_file(filp);72 if (ret)73 return ret;74 if (get_user(generation, (int __user *) arg)) {75 ret = -EFAULT;76 goto setversion_out;77 }78 79 inode_lock(inode);80 inode_set_ctime_current(inode);81 inode->i_generation = generation;82 inode_unlock(inode);83 84 mark_inode_dirty(inode);85setversion_out:86 mnt_drop_write_file(filp);87 return ret;88 }89 case EXT2_IOC_GETRSVSZ:90 if (test_opt(inode->i_sb, RESERVATION)91 && S_ISREG(inode->i_mode)92 && ei->i_block_alloc_info) {93 rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;94 return put_user(rsv_window_size, (int __user *)arg);95 }96 return -ENOTTY;97 case EXT2_IOC_SETRSVSZ: {98 99 if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))100 return -ENOTTY;101 102 if (!inode_owner_or_capable(&nop_mnt_idmap, inode))103 return -EACCES;104 105 if (get_user(rsv_window_size, (int __user *)arg))106 return -EFAULT;107 108 ret = mnt_want_write_file(filp);109 if (ret)110 return ret;111 112 if (rsv_window_size > EXT2_MAX_RESERVE_BLOCKS)113 rsv_window_size = EXT2_MAX_RESERVE_BLOCKS;114 115 /*116 * need to allocate reservation structure for this inode117 * before set the window size118 */119 /*120 * XXX What lock should protect the rsv_goal_size?121 * Accessed in ext2_get_block only. ext3 uses i_truncate.122 */123 mutex_lock(&ei->truncate_mutex);124 if (!ei->i_block_alloc_info)125 ext2_init_block_alloc_info(inode);126 127 if (ei->i_block_alloc_info){128 struct ext2_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;129 rsv->rsv_goal_size = rsv_window_size;130 } else {131 ret = -ENOMEM;132 }133 134 mutex_unlock(&ei->truncate_mutex);135 mnt_drop_write_file(filp);136 return ret;137 }138 default:139 return -ENOTTY;140 }141}142 143#ifdef CONFIG_COMPAT144long ext2_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)145{146 /* These are just misnamed, they actually get/put from/to user an int */147 switch (cmd) {148 case EXT2_IOC32_GETVERSION:149 cmd = EXT2_IOC_GETVERSION;150 break;151 case EXT2_IOC32_SETVERSION:152 cmd = EXT2_IOC_SETVERSION;153 break;154 default:155 return -ENOIOCTLCMD;156 }157 return ext2_ioctl(file, cmd, (unsigned long) compat_ptr(arg));158}159#endif160