fs/ubifs/ioctl.c

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This source file includes following definitions.
ubifs_set_inode_flags
ioctl2ubifs
ubifs2ioctl
setflags
ubifs_ioctl
ubifs_compat_ioctl
   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 "ubifs.h"
  18 
  19 /* Need to be kept consistent with checked flags in ioctl2ubifs() */
  20 #define UBIFS_SUPPORTED_IOCTL_FLAGS \
  21         (FS_COMPR_FL | FS_SYNC_FL | FS_APPEND_FL | \
  22          FS_IMMUTABLE_FL | FS_DIRSYNC_FL)
  23 
  24 /**
  25  * ubifs_set_inode_flags - set VFS inode flags.
  26  * @inode: VFS inode to set flags for
  27  *
  28  * This function propagates flags from UBIFS inode object to VFS inode object.
  29  */
  30 void ubifs_set_inode_flags(struct inode *inode)
  31 {
  32         unsigned int flags = ubifs_inode(inode)->flags;
  33 
  34         inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_DIRSYNC |
  35                             S_ENCRYPTED);
  36         if (flags & UBIFS_SYNC_FL)
  37                 inode->i_flags |= S_SYNC;
  38         if (flags & UBIFS_APPEND_FL)
  39                 inode->i_flags |= S_APPEND;
  40         if (flags & UBIFS_IMMUTABLE_FL)
  41                 inode->i_flags |= S_IMMUTABLE;
  42         if (flags & UBIFS_DIRSYNC_FL)
  43                 inode->i_flags |= S_DIRSYNC;
  44         if (flags & UBIFS_CRYPT_FL)
  45                 inode->i_flags |= S_ENCRYPTED;
  46 }
  47 
  48 /*
  49  * ioctl2ubifs - convert ioctl inode flags to UBIFS inode flags.
  50  * @ioctl_flags: flags to convert
  51  *
  52  * This function converts ioctl flags (@FS_COMPR_FL, etc) to UBIFS inode flags
  53  * (@UBIFS_COMPR_FL, etc).
  54  */
  55 static int ioctl2ubifs(int ioctl_flags)
  56 {
  57         int ubifs_flags = 0;
  58 
  59         if (ioctl_flags & FS_COMPR_FL)
  60                 ubifs_flags |= UBIFS_COMPR_FL;
  61         if (ioctl_flags & FS_SYNC_FL)
  62                 ubifs_flags |= UBIFS_SYNC_FL;
  63         if (ioctl_flags & FS_APPEND_FL)
  64                 ubifs_flags |= UBIFS_APPEND_FL;
  65         if (ioctl_flags & FS_IMMUTABLE_FL)
  66                 ubifs_flags |= UBIFS_IMMUTABLE_FL;
  67         if (ioctl_flags & FS_DIRSYNC_FL)
  68                 ubifs_flags |= UBIFS_DIRSYNC_FL;
  69 
  70         return ubifs_flags;
  71 }
  72 
  73 /*
  74  * ubifs2ioctl - convert UBIFS inode flags to ioctl inode flags.
  75  * @ubifs_flags: flags to convert
  76  *
  77  * This function converts UBIFS inode flags (@UBIFS_COMPR_FL, etc) to ioctl
  78  * flags (@FS_COMPR_FL, etc).
  79  */
  80 static int ubifs2ioctl(int ubifs_flags)
  81 {
  82         int ioctl_flags = 0;
  83 
  84         if (ubifs_flags & UBIFS_COMPR_FL)
  85                 ioctl_flags |= FS_COMPR_FL;
  86         if (ubifs_flags & UBIFS_SYNC_FL)
  87                 ioctl_flags |= FS_SYNC_FL;
  88         if (ubifs_flags & UBIFS_APPEND_FL)
  89                 ioctl_flags |= FS_APPEND_FL;
  90         if (ubifs_flags & UBIFS_IMMUTABLE_FL)
  91                 ioctl_flags |= FS_IMMUTABLE_FL;
  92         if (ubifs_flags & UBIFS_DIRSYNC_FL)
  93                 ioctl_flags |= FS_DIRSYNC_FL;
  94 
  95         return ioctl_flags;
  96 }
  97 
  98 static int setflags(struct inode *inode, int flags)
  99 {
 100         int oldflags, err, release;
 101         struct ubifs_inode *ui = ubifs_inode(inode);
 102         struct ubifs_info *c = inode->i_sb->s_fs_info;
 103         struct ubifs_budget_req req = { .dirtied_ino = 1,
 104                                         .dirtied_ino_d = ui->data_len };
 105 
 106         err = ubifs_budget_space(c, &req);
 107         if (err)
 108                 return err;
 109 
 110         mutex_lock(&ui->ui_mutex);
 111         oldflags = ubifs2ioctl(ui->flags);
 112         err = vfs_ioc_setflags_prepare(inode, oldflags, flags);
 113         if (err)
 114                 goto out_unlock;
 115 
 116         ui->flags &= ~ioctl2ubifs(UBIFS_SUPPORTED_IOCTL_FLAGS);
 117         ui->flags |= ioctl2ubifs(flags);
 118         ubifs_set_inode_flags(inode);
 119         inode->i_ctime = current_time(inode);
 120         release = ui->dirty;
 121         mark_inode_dirty_sync(inode);
 122         mutex_unlock(&ui->ui_mutex);
 123 
 124         if (release)
 125                 ubifs_release_budget(c, &req);
 126         if (IS_SYNC(inode))
 127                 err = write_inode_now(inode, 1);
 128         return err;
 129 
 130 out_unlock:
 131         ubifs_err(c, "can't modify inode %lu attributes", inode->i_ino);
 132         mutex_unlock(&ui->ui_mutex);
 133         ubifs_release_budget(c, &req);
 134         return err;
 135 }
 136 
 137 long ubifs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 138 {
 139         int flags, err;
 140         struct inode *inode = file_inode(file);
 141 
 142         switch (cmd) {
 143         case FS_IOC_GETFLAGS:
 144                 flags = ubifs2ioctl(ubifs_inode(inode)->flags);
 145 
 146                 dbg_gen("get flags: %#x, i_flags %#x", flags, inode->i_flags);
 147                 return put_user(flags, (int __user *) arg);
 148 
 149         case FS_IOC_SETFLAGS: {
 150                 if (IS_RDONLY(inode))
 151                         return -EROFS;
 152 
 153                 if (!inode_owner_or_capable(inode))
 154                         return -EACCES;
 155 
 156                 if (get_user(flags, (int __user *) arg))
 157                         return -EFAULT;
 158 
 159                 if (flags & ~UBIFS_SUPPORTED_IOCTL_FLAGS)
 160                         return -EOPNOTSUPP;
 161 
 162                 if (!S_ISDIR(inode->i_mode))
 163                         flags &= ~FS_DIRSYNC_FL;
 164 
 165                 /*
 166                  * Make sure the file-system is read-write and make sure it
 167                  * will not become read-only while we are changing the flags.
 168                  */
 169                 err = mnt_want_write_file(file);
 170                 if (err)
 171                         return err;
 172                 dbg_gen("set flags: %#x, i_flags %#x", flags, inode->i_flags);
 173                 err = setflags(inode, flags);
 174                 mnt_drop_write_file(file);
 175                 return err;
 176         }
 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         default:
 205                 return -ENOTTY;
 206         }
 207 }
 208 
 209 #ifdef CONFIG_COMPAT
 210 long ubifs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 211 {
 212         switch (cmd) {
 213         case FS_IOC32_GETFLAGS:
 214                 cmd = FS_IOC_GETFLAGS;
 215                 break;
 216         case FS_IOC32_SETFLAGS:
 217                 cmd = FS_IOC_SETFLAGS;
 218                 break;
 219         case FS_IOC_SET_ENCRYPTION_POLICY:
 220         case FS_IOC_GET_ENCRYPTION_POLICY:
 221         case FS_IOC_GET_ENCRYPTION_POLICY_EX:
 222         case FS_IOC_ADD_ENCRYPTION_KEY:
 223         case FS_IOC_REMOVE_ENCRYPTION_KEY:
 224         case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS:
 225         case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
 226                 break;
 227         default:
 228                 return -ENOIOCTLCMD;
 229         }
 230         return ubifs_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
 231 }
 232 #endif
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root/fs/ubifs/ioctl.c

DEFINITIONS
