1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * This file is part of UBIFS. 4 * 5 * Copyright (C) 2006-2008 Nokia Corporation. 6 * Copyright (C) 2006, 2007 University of Szeged, Hungary 7 * 8 * Authors: Zoltan Sogor 9 * Artem Bityutskiy (Битюцкий Артём) 10 * Adrian Hunter 11 */ 12 13 /* This file implements EXT2-compatible extended attribute ioctl() calls */ 14 15 #include <linux/compat.h> 16 #include <linux/mount.h> 17 #include <linux/fileattr.h> 18 #include "ubifs.h" 19 20 /* Need to be kept consistent with checked flags in ioctl2ubifs() */ 21 #define UBIFS_SETTABLE_IOCTL_FLAGS \ 22 (FS_COMPR_FL | FS_SYNC_FL | FS_APPEND_FL | \ 23 FS_IMMUTABLE_FL | FS_DIRSYNC_FL) 24 25 /* Need to be kept consistent with checked flags in ubifs2ioctl() */ 26 #define UBIFS_GETTABLE_IOCTL_FLAGS \ 27 (UBIFS_SETTABLE_IOCTL_FLAGS | FS_ENCRYPT_FL) 28 29 /** 30 * ubifs_set_inode_flags - set VFS inode flags. 31 * @inode: VFS inode to set flags for 32 * 33 * This function propagates flags from UBIFS inode object to VFS inode object. 34 */ 35 void ubifs_set_inode_flags(struct inode *inode) 36 { 37 unsigned int flags = ubifs_inode(inode)->flags; 38 39 inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_DIRSYNC | 40 S_ENCRYPTED); 41 if (flags & UBIFS_SYNC_FL) 42 inode->i_flags |= S_SYNC; 43 if (flags & UBIFS_APPEND_FL) 44 inode->i_flags |= S_APPEND; 45 if (flags & UBIFS_IMMUTABLE_FL) 46 inode->i_flags |= S_IMMUTABLE; 47 if (flags & UBIFS_DIRSYNC_FL) 48 inode->i_flags |= S_DIRSYNC; 49 if (flags & UBIFS_CRYPT_FL) 50 inode->i_flags |= S_ENCRYPTED; 51 } 52 53 /* 54 * ioctl2ubifs - convert ioctl inode flags to UBIFS inode flags. 55 * @ioctl_flags: flags to convert 56 * 57 * This function converts ioctl flags (@FS_COMPR_FL, etc) to UBIFS inode flags 58 * (@UBIFS_COMPR_FL, etc). 59 */ 60 static int ioctl2ubifs(int ioctl_flags) 61 { 62 int ubifs_flags = 0; 63 64 if (ioctl_flags & FS_COMPR_FL) 65 ubifs_flags |= UBIFS_COMPR_FL; 66 if (ioctl_flags & FS_SYNC_FL) 67 ubifs_flags |= UBIFS_SYNC_FL; 68 if (ioctl_flags & FS_APPEND_FL) 69 ubifs_flags |= UBIFS_APPEND_FL; 70 if (ioctl_flags & FS_IMMUTABLE_FL) 71 ubifs_flags |= UBIFS_IMMUTABLE_FL; 72 if (ioctl_flags & FS_DIRSYNC_FL) 73 ubifs_flags |= UBIFS_DIRSYNC_FL; 74 75 return ubifs_flags; 76 } 77 78 /* 79 * ubifs2ioctl - convert UBIFS inode flags to ioctl inode flags. 80 * @ubifs_flags: flags to convert 81 * 82 * This function converts UBIFS inode flags (@UBIFS_COMPR_FL, etc) to ioctl 83 * flags (@FS_COMPR_FL, etc). 84 */ 85 static int ubifs2ioctl(int ubifs_flags) 86 { 87 int ioctl_flags = 0; 88 89 if (ubifs_flags & UBIFS_COMPR_FL) 90 ioctl_flags |= FS_COMPR_FL; 91 if (ubifs_flags & UBIFS_SYNC_FL) 92 ioctl_flags |= FS_SYNC_FL; 93 if (ubifs_flags & UBIFS_APPEND_FL) 94 ioctl_flags |= FS_APPEND_FL; 95 if (ubifs_flags & UBIFS_IMMUTABLE_FL) 96 ioctl_flags |= FS_IMMUTABLE_FL; 97 if (ubifs_flags & UBIFS_DIRSYNC_FL) 98 ioctl_flags |= FS_DIRSYNC_FL; 99 if (ubifs_flags & UBIFS_CRYPT_FL) 100 ioctl_flags |= FS_ENCRYPT_FL; 101 102 return ioctl_flags; 103 } 104 105 static int setflags(struct inode *inode, int flags) 106 { 107 int err, release; 108 struct ubifs_inode *ui = ubifs_inode(inode); 109 struct ubifs_info *c = inode->i_sb->s_fs_info; 110 struct ubifs_budget_req req = { .dirtied_ino = 1, 111 .dirtied_ino_d = ui->data_len }; 112 113 err = ubifs_budget_space(c, &req); 114 if (err) 115 return err; 116 117 mutex_lock(&ui->ui_mutex); 118 ui->flags &= ~ioctl2ubifs(UBIFS_SETTABLE_IOCTL_FLAGS); 119 ui->flags |= ioctl2ubifs(flags); 120 ubifs_set_inode_flags(inode); 121 inode->i_ctime = current_time(inode); 122 release = ui->dirty; 123 mark_inode_dirty_sync(inode); 124 mutex_unlock(&ui->ui_mutex); 125 126 if (release) 127 ubifs_release_budget(c, &req); 128 if (IS_SYNC(inode)) 129 err = write_inode_now(inode, 1); 130 return err; 131 } 132 133 int ubifs_fileattr_get(struct dentry *dentry, struct fileattr *fa) 134 { 135 struct inode *inode = d_inode(dentry); 136 int flags = ubifs2ioctl(ubifs_inode(inode)->flags); 137 138 if (d_is_special(dentry)) 139 return -ENOTTY; 140 141 dbg_gen("get flags: %#x, i_flags %#x", flags, inode->i_flags); 142 fileattr_fill_flags(fa, flags); 143 144 return 0; 145 } 146 147 int ubifs_fileattr_set(struct user_namespace *mnt_userns, 148 struct dentry *dentry, struct fileattr *fa) 149 { 150 struct inode *inode = d_inode(dentry); 151 int flags = fa->flags; 152 153 if (d_is_special(dentry)) 154 return -ENOTTY; 155 156 if (fileattr_has_fsx(fa)) 157 return -EOPNOTSUPP; 158 159 if (flags & ~UBIFS_GETTABLE_IOCTL_FLAGS) 160 return -EOPNOTSUPP; 161 162 flags &= UBIFS_SETTABLE_IOCTL_FLAGS; 163 164 if (!S_ISDIR(inode->i_mode)) 165 flags &= ~FS_DIRSYNC_FL; 166 167 dbg_gen("set flags: %#x, i_flags %#x", flags, inode->i_flags); 168 return setflags(inode, flags); 169 } 170 171 long ubifs_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 172 { 173 int err; 174 struct inode *inode = file_inode(file); 175 176 switch (cmd) { 177 case FS_IOC_SET_ENCRYPTION_POLICY: { 178 struct ubifs_info *c = inode->i_sb->s_fs_info; 179 180 err = ubifs_enable_encryption(c); 181 if (err) 182 return err; 183 184 return fscrypt_ioctl_set_policy(file, (const void __user *)arg); 185 } 186 case FS_IOC_GET_ENCRYPTION_POLICY: 187 return fscrypt_ioctl_get_policy(file, (void __user *)arg); 188 189 case FS_IOC_GET_ENCRYPTION_POLICY_EX: 190 return fscrypt_ioctl_get_policy_ex(file, (void __user *)arg); 191 192 case FS_IOC_ADD_ENCRYPTION_KEY: 193 return fscrypt_ioctl_add_key(file, (void __user *)arg); 194 195 case FS_IOC_REMOVE_ENCRYPTION_KEY: 196 return fscrypt_ioctl_remove_key(file, (void __user *)arg); 197 198 case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS: 199 return fscrypt_ioctl_remove_key_all_users(file, 200 (void __user *)arg); 201 case FS_IOC_GET_ENCRYPTION_KEY_STATUS: 202 return fscrypt_ioctl_get_key_status(file, (void __user *)arg); 203 204 case FS_IOC_GET_ENCRYPTION_NONCE: 205 return fscrypt_ioctl_get_nonce(file, (void __user *)arg); 206 207 default: 208 return -ENOTTY; 209 } 210 } 211 212 #ifdef CONFIG_COMPAT 213 long ubifs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 214 { 215 switch (cmd) { 216 case FS_IOC32_GETFLAGS: 217 cmd = FS_IOC_GETFLAGS; 218 break; 219 case FS_IOC32_SETFLAGS: 220 cmd = FS_IOC_SETFLAGS; 221 break; 222 case FS_IOC_SET_ENCRYPTION_POLICY: 223 case FS_IOC_GET_ENCRYPTION_POLICY: 224 case FS_IOC_GET_ENCRYPTION_POLICY_EX: 225 case FS_IOC_ADD_ENCRYPTION_KEY: 226 case FS_IOC_REMOVE_ENCRYPTION_KEY: 227 case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS: 228 case FS_IOC_GET_ENCRYPTION_KEY_STATUS: 229 case FS_IOC_GET_ENCRYPTION_NONCE: 230 break; 231 default: 232 return -ENOIOCTLCMD; 233 } 234 return ubifs_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); 235 } 236 #endif 237