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                 mutex_lock(&inode->i_mutex);
 138                 handle = ext3_journal_start(inode, 1);
 139                 if (IS_ERR(handle)) {
 140                         err = PTR_ERR(handle);
 141                         goto unlock_out;
 142                 }
 143                 err = ext3_reserve_inode_write(handle, inode, &iloc);
 144                 if (err == 0) {
 145                         inode->i_ctime = CURRENT_TIME_SEC;
 146                         inode->i_generation = generation;
 147                         err = ext3_mark_iloc_dirty(handle, inode, &iloc);
 148                 }
 149                 ext3_journal_stop(handle);
 150
 151 unlock_out:
 152                 mutex_unlock(&inode->i_mutex);
 153 setversion_out:
 154                 mnt_drop_write(filp->f_path.mnt);
 155                 return err;
 156         }
 157         case EXT3_IOC_GETRSVSZ:
 158                 if (test_opt(inode->i_sb, RESERVATION)
 159                         && S_ISREG(inode->i_mode)
 160                         && ei->i_block_alloc_info) {
 161                         rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;
 162                         return put_user(rsv_window_size, (int __user *)arg);
 163                 }
 164                 return -ENOTTY;
 165         case EXT3_IOC_SETRSVSZ: {
 166                 int err;
 167
 168                 if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
 169                         return -ENOTTY;
 170
 171                 err = mnt_want_write(filp->f_path.mnt);
 172                 if (err)
 173                         return err;
 174
 175                 if (!inode_owner_or_capable(inode)) {
 176                         err = -EACCES;
 177                         goto setrsvsz_out;
 178                 }
 179
 180                 if (get_user(rsv_window_size, (int __user *)arg)) {
 181                         err = -EFAULT;
 182                         goto setrsvsz_out;
 183                 }
 184
 185                 if (rsv_window_size > EXT3_MAX_RESERVE_BLOCKS)
 186                         rsv_window_size = EXT3_MAX_RESERVE_BLOCKS;
 187
 188                 /*
 189                  * need to allocate reservation structure for this inode
 190                  * before set the window size
 191                  */
 192                 mutex_lock(&ei->truncate_mutex);
 193                 if (!ei->i_block_alloc_info)
 194                         ext3_init_block_alloc_info(inode);
 195
 196                 if (ei->i_block_alloc_info){
 197                         struct ext3_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
 198                         rsv->rsv_goal_size = rsv_window_size;
 199                 }
 200                 mutex_unlock(&ei->truncate_mutex);
 201 setrsvsz_out:
 202                 mnt_drop_write(filp->f_path.mnt);
 203                 return err;
 204         }
 205         case EXT3_IOC_GROUP_EXTEND: {
 206                 ext3_fsblk_t n_blocks_count;
 207                 struct super_block *sb = inode->i_sb;
 208                 int err, err2;
 209
 210                 if (!capable(CAP_SYS_RESOURCE))
 211                         return -EPERM;
 212
 213                 err = mnt_want_write(filp->f_path.mnt);
 214                 if (err)
 215                         return err;
 216
 217                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
 218                         err = -EFAULT;
 219                         goto group_extend_out;
 220                 }
 221                 err = ext3_group_extend(sb, EXT3_SB(sb)->s_es, n_blocks_count);
 222                 journal_lock_updates(EXT3_SB(sb)->s_journal);
 223                 err2 = journal_flush(EXT3_SB(sb)->s_journal);
 224                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
 225                 if (err == 0)
 226                         err = err2;
 227 group_extend_out:
 228                 mnt_drop_write(filp->f_path.mnt);
 229                 return err;
 230         }
 231         case EXT3_IOC_GROUP_ADD: {
 232                 struct ext3_new_group_data input;
 233                 struct super_block *sb = inode->i_sb;
 234                 int err, err2;
 235
 236                 if (!capable(CAP_SYS_RESOURCE))
 237                         return -EPERM;
 238
 239                 err = mnt_want_write(filp->f_path.mnt);
 240                 if (err)
 241                         return err;
 242
 243                 if (copy_from_user(&input, (struct ext3_new_group_input __user *)arg,
 244                                 sizeof(input))) {
 245                         err = -EFAULT;
 246                         goto group_add_out;
 247                 }
 248
 249                 err = ext3_group_add(sb, &input);
 250                 journal_lock_updates(EXT3_SB(sb)->s_journal);
 251                 err2 = journal_flush(EXT3_SB(sb)->s_journal);
 252                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
 253                 if (err == 0)
 254                         err = err2;
 255 group_add_out:
 256                 mnt_drop_write(filp->f_path.mnt);
 257                 return err;
 258         }
 259         case FITRIM: {
 260
 261                 struct super_block *sb = inode->i_sb;
 262                 struct fstrim_range range;
 263                 int ret = 0;
 264
 265                 if (!capable(CAP_SYS_ADMIN))
 266                         return -EPERM;
 267
 268                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
 269                                    sizeof(range)))
 270                         return -EFAULT;
 271
 272                 ret = ext3_trim_fs(sb, &range);
 273                 if (ret < 0)
 274                         return ret;
 275
 276                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
 277                                  sizeof(range)))
 278                         return -EFAULT;
 279
 280                 return 0;
 281         }
 282
 283         default:
 284                 return -ENOTTY;
 285         }
 286 }
 287
 288 #ifdef CONFIG_COMPAT
 289 long ext3_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 290 {
 291         /* These are just misnamed, they actually get/put from/to user an int */
 292         switch (cmd) {
 293         case EXT3_IOC32_GETFLAGS:
 294                 cmd = EXT3_IOC_GETFLAGS;
 295                 break;
 296         case EXT3_IOC32_SETFLAGS:
 297                 cmd = EXT3_IOC_SETFLAGS;
 298                 break;
 299         case EXT3_IOC32_GETVERSION:
 300                 cmd = EXT3_IOC_GETVERSION;
 301                 break;
 302         case EXT3_IOC32_SETVERSION:
 303                 cmd = EXT3_IOC_SETVERSION;
 304                 break;
 305         case EXT3_IOC32_GROUP_EXTEND:
 306                 cmd = EXT3_IOC_GROUP_EXTEND;
 307                 break;
 308         case EXT3_IOC32_GETVERSION_OLD:
 309                 cmd = EXT3_IOC_GETVERSION_OLD;
 310                 break;
 311         case EXT3_IOC32_SETVERSION_OLD:
 312                 cmd = EXT3_IOC_SETVERSION_OLD;
 313                 break;
 314 #ifdef CONFIG_JBD_DEBUG
 315         case EXT3_IOC32_WAIT_FOR_READONLY:
 316                 cmd = EXT3_IOC_WAIT_FOR_READONLY;
 317                 break;
 318 #endif
 319         case EXT3_IOC32_GETRSVSZ:
 320                 cmd = EXT3_IOC_GETRSVSZ;
 321                 break;
 322         case EXT3_IOC32_SETRSVSZ:
 323                 cmd = EXT3_IOC_SETRSVSZ;
 324                 break;
 325         case EXT3_IOC_GROUP_ADD:
 326                 break;
 327         default:
 328                 return -ENOIOCTLCMD;
 329         }
 330         return ext3_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
 331 }
 332 #endif