fs/ext3/ioctl.c

   1 /*
   2  * linux/fs/ext3/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 <linux/fs.h>
  11 #include <linux/jbd.h>
  12 #include <linux/capability.h>
  13 #include <linux/ext3_fs.h>
  14 #include <linux/ext3_jbd.h>
  15 #include <linux/mount.h>
  16 #include <linux/time.h>
  17 #include <linux/compat.h>
  18 #include <asm/uaccess.h>
  19
  20 long ext3_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
  21 {
  22         struct inode *inode = filp->f_dentry->d_inode;
  23         struct ext3_inode_info *ei = EXT3_I(inode);
  24         unsigned int flags;
  25         unsigned short rsv_window_size;
  26
  27         ext3_debug ("cmd = %u, arg = %lu\n", cmd, arg);
  28
  29         switch (cmd) {
  30         case EXT3_IOC_GETFLAGS:
  31                 ext3_get_inode_flags(ei);
  32                 flags = ei->i_flags & EXT3_FL_USER_VISIBLE;
  33                 return put_user(flags, (int __user *) arg);
  34         case EXT3_IOC_SETFLAGS: {
  35                 handle_t *handle = NULL;
  36                 int err;
  37                 struct ext3_iloc iloc;
  38                 unsigned int oldflags;
  39                 unsigned int jflag;
  40
  41                 if (!inode_owner_or_capable(inode))
  42                         return -EACCES;
  43
  44                 if (get_user(flags, (int __user *) arg))
  45                         return -EFAULT;
  46
  47                 err = mnt_want_write(filp->f_path.mnt);
  48                 if (err)
  49                         return err;
  50
  51                 flags = ext3_mask_flags(inode->i_mode, flags);
  52
  53                 mutex_lock(&inode->i_mutex);
  54
  55                 /* Is it quota file? Do not allow user to mess with it */
  56                 err = -EPERM;
  57                 if (IS_NOQUOTA(inode))
  58                         goto flags_out;
  59
  60                 oldflags = ei->i_flags;
  61
  62                 /* The JOURNAL_DATA flag is modifiable only by root */
  63                 jflag = flags & EXT3_JOURNAL_DATA_FL;
  64
  65                 /*
  66                  * The IMMUTABLE and APPEND_ONLY flags can only be changed by
  67                  * the relevant capability.
  68                  *
  69                  * This test looks nicer. Thanks to Pauline Middelink
  70                  */
  71                 if ((flags ^ oldflags) & (EXT3_APPEND_FL | EXT3_IMMUTABLE_FL)) {
  72                         if (!capable(CAP_LINUX_IMMUTABLE))
  73                                 goto flags_out;
  74                 }
  75
  76                 /*
  77                  * The JOURNAL_DATA flag can only be changed by
  78                  * the relevant capability.
  79                  */
  80                 if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL)) {
  81                         if (!capable(CAP_SYS_RESOURCE))
  82                                 goto flags_out;
  83                 }
  84
  85                 handle = ext3_journal_start(inode, 1);
  86                 if (IS_ERR(handle)) {
  87                         err = PTR_ERR(handle);
  88                         goto flags_out;
  89                 }
  90                 if (IS_SYNC(inode))
  91                         handle->h_sync = 1;
  92                 err = ext3_reserve_inode_write(handle, inode, &iloc);
  93                 if (err)
  94                         goto flags_err;
  95
  96                 flags = flags & EXT3_FL_USER_MODIFIABLE;
  97                 flags |= oldflags & ~EXT3_FL_USER_MODIFIABLE;
  98                 ei->i_flags = flags;
  99
 100                 ext3_set_inode_flags(inode);
 101                 inode->i_ctime = CURRENT_TIME_SEC;
 102
 103                 err = ext3_mark_iloc_dirty(handle, inode, &iloc);
 104 flags_err:
 105                 ext3_journal_stop(handle);
 106                 if (err)
 107                         goto flags_out;
 108
 109                 if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL))
 110                         err = ext3_change_inode_journal_flag(inode, jflag);
 111 flags_out:
 112                 mutex_unlock(&inode->i_mutex);
 113                 mnt_drop_write(filp->f_path.mnt);
 114                 return err;
 115         }
 116         case EXT3_IOC_GETVERSION:
 117         case EXT3_IOC_GETVERSION_OLD:
 118                 return put_user(inode->i_generation, (int __user *) arg);
 119         case EXT3_IOC_SETVERSION:
 120         case EXT3_IOC_SETVERSION_OLD: {
 121                 handle_t *handle;
 122                 struct ext3_iloc iloc;
 123                 __u32 generation;
 124                 int err;
 125
 126                 if (!inode_owner_or_capable(inode))
 127                         return -EPERM;
 128
 129                 err = mnt_want_write(filp->f_path.mnt);
 130                 if (err)
 131                         return err;
 132                 if (get_user(generation, (int __user *) arg)) {
 133                         err = -EFAULT;
 134                         goto setversion_out;
 135                 }
 136
 137                 handle = ext3_journal_start(inode, 1);
 138                 if (IS_ERR(handle)) {
 139                         err = PTR_ERR(handle);
 140                         goto setversion_out;
 141                 }
 142                 err = ext3_reserve_inode_write(handle, inode, &iloc);
 143                 if (err == 0) {
 144                         inode->i_ctime = CURRENT_TIME_SEC;
 145                         inode->i_generation = generation;
 146                         err = ext3_mark_iloc_dirty(handle, inode, &iloc);
 147                 }
 148                 ext3_journal_stop(handle);
 149 setversion_out:
 150                 mnt_drop_write(filp->f_path.mnt);
 151                 return err;
 152         }
 153         case EXT3_IOC_GETRSVSZ:
 154                 if (test_opt(inode->i_sb, RESERVATION)
 155                         && S_ISREG(inode->i_mode)
 156                         && ei->i_block_alloc_info) {
 157                         rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;
 158                         return put_user(rsv_window_size, (int __user *)arg);
 159                 }
 160                 return -ENOTTY;
 161         case EXT3_IOC_SETRSVSZ: {
 162                 int err;
 163
 164                 if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
 165                         return -ENOTTY;
 166
 167                 err = mnt_want_write(filp->f_path.mnt);
 168                 if (err)
 169                         return err;
 170
 171                 if (!inode_owner_or_capable(inode)) {
 172                         err = -EACCES;
 173                         goto setrsvsz_out;
 174                 }
 175
 176                 if (get_user(rsv_window_size, (int __user *)arg)) {
 177                         err = -EFAULT;
 178                         goto setrsvsz_out;
 179                 }
 180
 181                 if (rsv_window_size > EXT3_MAX_RESERVE_BLOCKS)
 182                         rsv_window_size = EXT3_MAX_RESERVE_BLOCKS;
 183
 184                 /*
 185                  * need to allocate reservation structure for this inode
 186                  * before set the window size
 187                  */
 188                 mutex_lock(&ei->truncate_mutex);
 189                 if (!ei->i_block_alloc_info)
 190                         ext3_init_block_alloc_info(inode);
 191
 192                 if (ei->i_block_alloc_info){
 193                         struct ext3_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
 194                         rsv->rsv_goal_size = rsv_window_size;
 195                 }
 196                 mutex_unlock(&ei->truncate_mutex);
 197 setrsvsz_out:
 198                 mnt_drop_write(filp->f_path.mnt);
 199                 return err;
 200         }
 201         case EXT3_IOC_GROUP_EXTEND: {
 202                 ext3_fsblk_t n_blocks_count;
 203                 struct super_block *sb = inode->i_sb;
 204                 int err, err2;
 205
 206                 if (!capable(CAP_SYS_RESOURCE))
 207                         return -EPERM;
 208
 209                 err = mnt_want_write(filp->f_path.mnt);
 210                 if (err)
 211                         return err;
 212
 213                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
 214                         err = -EFAULT;
 215                         goto group_extend_out;
 216                 }
 217                 err = ext3_group_extend(sb, EXT3_SB(sb)->s_es, n_blocks_count);
 218                 journal_lock_updates(EXT3_SB(sb)->s_journal);
 219                 err2 = journal_flush(EXT3_SB(sb)->s_journal);
 220                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
 221                 if (err == 0)
 222                         err = err2;
 223 group_extend_out:
 224                 mnt_drop_write(filp->f_path.mnt);
 225                 return err;
 226         }
 227         case EXT3_IOC_GROUP_ADD: {
 228                 struct ext3_new_group_data input;
 229                 struct super_block *sb = inode->i_sb;
 230                 int err, err2;
 231
 232                 if (!capable(CAP_SYS_RESOURCE))
 233                         return -EPERM;
 234
 235                 err = mnt_want_write(filp->f_path.mnt);
 236                 if (err)
 237                         return err;
 238
 239                 if (copy_from_user(&input, (struct ext3_new_group_input __user *)arg,
 240                                 sizeof(input))) {
 241                         err = -EFAULT;
 242                         goto group_add_out;
 243                 }
 244
 245                 err = ext3_group_add(sb, &input);
 246                 journal_lock_updates(EXT3_SB(sb)->s_journal);
 247                 err2 = journal_flush(EXT3_SB(sb)->s_journal);
 248                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
 249                 if (err == 0)
 250                         err = err2;
 251 group_add_out:
 252                 mnt_drop_write(filp->f_path.mnt);
 253                 return err;
 254         }
 255         case FITRIM: {
 256
 257                 struct super_block *sb = inode->i_sb;
 258                 struct fstrim_range range;
 259                 int ret = 0;
 260
 261                 if (!capable(CAP_SYS_ADMIN))
 262                         return -EPERM;
 263
 264                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
 265                                    sizeof(range)))
 266                         return -EFAULT;
 267
 268                 ret = ext3_trim_fs(sb, &range);
 269                 if (ret < 0)
 270                         return ret;
 271
 272                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
 273                                  sizeof(range)))
 274                         return -EFAULT;
 275
 276                 return 0;
 277         }
 278
 279         default:
 280                 return -ENOTTY;
 281         }
 282 }
 283
 284 #ifdef CONFIG_COMPAT
 285 long ext3_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 286 {
 287         /* These are just misnamed, they actually get/put from/to user an int */
 288         switch (cmd) {
 289         case EXT3_IOC32_GETFLAGS:
 290                 cmd = EXT3_IOC_GETFLAGS;
 291                 break;
 292         case EXT3_IOC32_SETFLAGS:
 293                 cmd = EXT3_IOC_SETFLAGS;
 294                 break;
 295         case EXT3_IOC32_GETVERSION:
 296                 cmd = EXT3_IOC_GETVERSION;
 297                 break;
 298         case EXT3_IOC32_SETVERSION:
 299                 cmd = EXT3_IOC_SETVERSION;
 300                 break;
 301         case EXT3_IOC32_GROUP_EXTEND:
 302                 cmd = EXT3_IOC_GROUP_EXTEND;
 303                 break;
 304         case EXT3_IOC32_GETVERSION_OLD:
 305                 cmd = EXT3_IOC_GETVERSION_OLD;
 306                 break;
 307         case EXT3_IOC32_SETVERSION_OLD:
 308                 cmd = EXT3_IOC_SETVERSION_OLD;
 309                 break;
 310 #ifdef CONFIG_JBD_DEBUG
 311         case EXT3_IOC32_WAIT_FOR_READONLY:
 312                 cmd = EXT3_IOC_WAIT_FOR_READONLY;
 313                 break;
 314 #endif
 315         case EXT3_IOC32_GETRSVSZ:
 316                 cmd = EXT3_IOC_GETRSVSZ;
 317                 break;
 318         case EXT3_IOC32_SETRSVSZ:
 319                 cmd = EXT3_IOC_SETRSVSZ;
 320                 break;
 321         case EXT3_IOC_GROUP_ADD:
 322                 break;
 323         default:
 324                 return -ENOIOCTLCMD;
 325         }
 326         return ext3_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
 327 }
 328 #endif