1 /* 2 * linux/fs/ext2/ioctl.c 3 * 4 * Copyright (C) 1993, 1994, 1995 5 * Remy Card (card@masi.ibp.fr) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 */ 9 10 #include "ext2.h" 11 #include <linux/capability.h> 12 #include <linux/time.h> 13 #include <linux/sched.h> 14 #include <linux/compat.h> 15 #include <linux/smp_lock.h> 16 #include <asm/current.h> 17 #include <asm/uaccess.h> 18 19 20 int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd, 21 unsigned long arg) 22 { 23 struct ext2_inode_info *ei = EXT2_I(inode); 24 unsigned int flags; 25 unsigned short rsv_window_size; 26 27 ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg); 28 29 switch (cmd) { 30 case EXT2_IOC_GETFLAGS: 31 ext2_get_inode_flags(ei); 32 flags = ei->i_flags & EXT2_FL_USER_VISIBLE; 33 return put_user(flags, (int __user *) arg); 34 case EXT2_IOC_SETFLAGS: { 35 unsigned int oldflags; 36 37 if (IS_RDONLY(inode)) 38 return -EROFS; 39 40 if (!is_owner_or_cap(inode)) 41 return -EACCES; 42 43 if (get_user(flags, (int __user *) arg)) 44 return -EFAULT; 45 46 if (!S_ISDIR(inode->i_mode)) 47 flags &= ~EXT2_DIRSYNC_FL; 48 49 mutex_lock(&inode->i_mutex); 50 oldflags = ei->i_flags; 51 52 /* 53 * The IMMUTABLE and APPEND_ONLY flags can only be changed by 54 * the relevant capability. 55 * 56 * This test looks nicer. Thanks to Pauline Middelink 57 */ 58 if ((flags ^ oldflags) & (EXT2_APPEND_FL | EXT2_IMMUTABLE_FL)) { 59 if (!capable(CAP_LINUX_IMMUTABLE)) { 60 mutex_unlock(&inode->i_mutex); 61 return -EPERM; 62 } 63 } 64 65 flags = flags & EXT2_FL_USER_MODIFIABLE; 66 flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE; 67 ei->i_flags = flags; 68 mutex_unlock(&inode->i_mutex); 69 70 ext2_set_inode_flags(inode); 71 inode->i_ctime = CURRENT_TIME_SEC; 72 mark_inode_dirty(inode); 73 return 0; 74 } 75 case EXT2_IOC_GETVERSION: 76 return put_user(inode->i_generation, (int __user *) arg); 77 case EXT2_IOC_SETVERSION: 78 if (!is_owner_or_cap(inode)) 79 return -EPERM; 80 if (IS_RDONLY(inode)) 81 return -EROFS; 82 if (get_user(inode->i_generation, (int __user *) arg)) 83 return -EFAULT; 84 inode->i_ctime = CURRENT_TIME_SEC; 85 mark_inode_dirty(inode); 86 return 0; 87 case EXT2_IOC_GETRSVSZ: 88 if (test_opt(inode->i_sb, RESERVATION) 89 && S_ISREG(inode->i_mode) 90 && ei->i_block_alloc_info) { 91 rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size; 92 return put_user(rsv_window_size, (int __user *)arg); 93 } 94 return -ENOTTY; 95 case EXT2_IOC_SETRSVSZ: { 96 97 if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode)) 98 return -ENOTTY; 99 100 if (IS_RDONLY(inode)) 101 return -EROFS; 102 103 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER)) 104 return -EACCES; 105 106 if (get_user(rsv_window_size, (int __user *)arg)) 107 return -EFAULT; 108 109 if (rsv_window_size > EXT2_MAX_RESERVE_BLOCKS) 110 rsv_window_size = EXT2_MAX_RESERVE_BLOCKS; 111 112 /* 113 * need to allocate reservation structure for this inode 114 * before set the window size 115 */ 116 /* 117 * XXX What lock should protect the rsv_goal_size? 118 * Accessed in ext2_get_block only. ext3 uses i_truncate. 119 */ 120 mutex_lock(&ei->truncate_mutex); 121 if (!ei->i_block_alloc_info) 122 ext2_init_block_alloc_info(inode); 123 124 if (ei->i_block_alloc_info){ 125 struct ext2_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node; 126 rsv->rsv_goal_size = rsv_window_size; 127 } 128 mutex_unlock(&ei->truncate_mutex); 129 return 0; 130 } 131 default: 132 return -ENOTTY; 133 } 134 } 135 136 #ifdef CONFIG_COMPAT 137 long ext2_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 138 { 139 struct inode *inode = file->f_path.dentry->d_inode; 140 int ret; 141 142 /* These are just misnamed, they actually get/put from/to user an int */ 143 switch (cmd) { 144 case EXT2_IOC32_GETFLAGS: 145 cmd = EXT2_IOC_GETFLAGS; 146 break; 147 case EXT2_IOC32_SETFLAGS: 148 cmd = EXT2_IOC_SETFLAGS; 149 break; 150 case EXT2_IOC32_GETVERSION: 151 cmd = EXT2_IOC_GETVERSION; 152 break; 153 case EXT2_IOC32_SETVERSION: 154 cmd = EXT2_IOC_SETVERSION; 155 break; 156 default: 157 return -ENOIOCTLCMD; 158 } 159 lock_kernel(); 160 ret = ext2_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg)); 161 unlock_kernel(); 162 return ret; 163 } 164 #endif 165