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