SAFE public projects git trees. - safe/jmp/linux-2.6/blob - fs/quota/quota.c

   1 /*
   2  * Quota code necessary even when VFS quota support is not compiled
   3  * into the kernel.  The interesting stuff is over in dquot.c, here
   4  * we have symbols for initial quotactl(2) handling, the sysctl(2)
   5  * variables, etc - things needed even when quota support disabled.
   6  */
   7
   8 #include <linux/fs.h>
   9 #include <linux/namei.h>
  10 #include <linux/slab.h>
  11 #include <asm/current.h>
  12 #include <asm/uaccess.h>
  13 #include <linux/compat.h>
  14 #include <linux/kernel.h>
  15 #include <linux/security.h>
  16 #include <linux/syscalls.h>
  17 #include <linux/buffer_head.h>
  18 #include <linux/capability.h>
  19 #include <linux/quotaops.h>
  20 #include <linux/types.h>
  21 #include <net/netlink.h>
  22 #include <net/genetlink.h>
  23
  24 /* Check validity of generic quotactl commands */
  25 static int generic_quotactl_valid(struct super_block *sb, int type, int cmd,
  26                                   qid_t id)
  27 {
  28         if (type >= MAXQUOTAS)
  29                 return -EINVAL;
  30         if (!sb && cmd != Q_SYNC)
  31                 return -ENODEV;
  32         /* Is operation supported? */
  33         if (sb && !sb->s_qcop)
  34                 return -ENOSYS;
  35
  36         switch (cmd) {
  37                 case Q_GETFMT:
  38                         break;
  39                 case Q_QUOTAON:
  40                         if (!sb->s_qcop->quota_on)
  41                                 return -ENOSYS;
  42                         break;
  43                 case Q_QUOTAOFF:
  44                         if (!sb->s_qcop->quota_off)
  45                                 return -ENOSYS;
  46                         break;
  47                 case Q_SETINFO:
  48                         if (!sb->s_qcop->set_info)
  49                                 return -ENOSYS;
  50                         break;
  51                 case Q_GETINFO:
  52                         if (!sb->s_qcop->get_info)
  53                                 return -ENOSYS;
  54                         break;
  55                 case Q_SETQUOTA:
  56                         if (!sb->s_qcop->set_dqblk)
  57                                 return -ENOSYS;
  58                         break;
  59                 case Q_GETQUOTA:
  60                         if (!sb->s_qcop->get_dqblk)
  61                                 return -ENOSYS;
  62                         break;
  63                 case Q_SYNC:
  64                         if (sb && !sb->s_qcop->quota_sync)
  65                                 return -ENOSYS;
  66                         break;
  67                 default:
  68                         return -EINVAL;
  69         }
  70
  71         /* Is quota turned on for commands which need it? */
  72         switch (cmd) {
  73                 case Q_GETFMT:
  74                 case Q_GETINFO:
  75                 case Q_SETINFO:
  76                 case Q_SETQUOTA:
  77                 case Q_GETQUOTA:
  78                         /* This is just an informative test so we are satisfied
  79                          * without the lock */
  80                         if (!sb_has_quota_active(sb, type))
  81                                 return -ESRCH;
  82         }
  83
  84         /* Check privileges */
  85         if (cmd == Q_GETQUOTA) {
  86                 if (((type == USRQUOTA && current_euid() != id) ||
  87                      (type == GRPQUOTA && !in_egroup_p(id))) &&
  88                     !capable(CAP_SYS_ADMIN))
  89                         return -EPERM;
  90         }
  91         else if (cmd != Q_GETFMT && cmd != Q_SYNC && cmd != Q_GETINFO)
  92                 if (!capable(CAP_SYS_ADMIN))
  93                         return -EPERM;
  94
  95         return 0;
  96 }
  97
  98 /* Check validity of XFS Quota Manager commands */
  99 static int xqm_quotactl_valid(struct super_block *sb, int type, int cmd,
 100                               qid_t id)
 101 {
 102         if (type >= XQM_MAXQUOTAS)
 103                 return -EINVAL;
 104         if (!sb)
 105                 return -ENODEV;
 106         if (!sb->s_qcop)
 107                 return -ENOSYS;
 108
 109         switch (cmd) {
 110                 case Q_XQUOTAON:
 111                 case Q_XQUOTAOFF:
 112                 case Q_XQUOTARM:
 113                         if (!sb->s_qcop->set_xstate)
 114                                 return -ENOSYS;
 115                         break;
 116                 case Q_XGETQSTAT:
 117                         if (!sb->s_qcop->get_xstate)
 118                                 return -ENOSYS;
 119                         break;
 120                 case Q_XSETQLIM:
 121                         if (!sb->s_qcop->set_xquota)
 122                                 return -ENOSYS;
 123                         break;
 124                 case Q_XGETQUOTA:
 125                         if (!sb->s_qcop->get_xquota)
 126                                 return -ENOSYS;
 127                         break;
 128                 case Q_XQUOTASYNC:
 129                         if (!sb->s_qcop->quota_sync)
 130                                 return -ENOSYS;
 131                         break;
 132                 default:
 133                         return -EINVAL;
 134         }
 135
 136         /* Check privileges */
 137         if (cmd == Q_XGETQUOTA) {
 138                 if (((type == XQM_USRQUOTA && current_euid() != id) ||
 139                      (type == XQM_GRPQUOTA && !in_egroup_p(id))) &&
 140                      !capable(CAP_SYS_ADMIN))
 141                         return -EPERM;
 142         } else if (cmd != Q_XGETQSTAT && cmd != Q_XQUOTASYNC) {
 143                 if (!capable(CAP_SYS_ADMIN))
 144                         return -EPERM;
 145         }
 146
 147         return 0;
 148 }
 149
 150 static int check_quotactl_valid(struct super_block *sb, int type, int cmd,
 151                                 qid_t id)
 152 {
 153         int error;
 154
 155         if (XQM_COMMAND(cmd))
 156                 error = xqm_quotactl_valid(sb, type, cmd, id);
 157         else
 158                 error = generic_quotactl_valid(sb, type, cmd, id);
 159         if (!error)
 160                 error = security_quotactl(cmd, type, id, sb);
 161         return error;
 162 }
 163
 164 #ifdef CONFIG_QUOTA
 165 void sync_quota_sb(struct super_block *sb, int type)
 166 {
 167         int cnt;
 168
 169         if (!sb->s_qcop->quota_sync)
 170                 return;
 171
 172         sb->s_qcop->quota_sync(sb, type);
 173
 174         if (sb_dqopt(sb)->flags & DQUOT_QUOTA_SYS_FILE)
 175                 return;
 176         /* This is not very clever (and fast) but currently I don't know about
 177          * any other simple way of getting quota data to disk and we must get
 178          * them there for userspace to be visible... */
 179         if (sb->s_op->sync_fs)
 180                 sb->s_op->sync_fs(sb, 1);
 181         sync_blockdev(sb->s_bdev);
 182
 183         /*
 184          * Now when everything is written we can discard the pagecache so
 185          * that userspace sees the changes.
 186          */
 187         mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
 188         for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
 189                 if (type != -1 && cnt != type)
 190                         continue;
 191                 if (!sb_has_quota_active(sb, cnt))
 192                         continue;
 193                 mutex_lock_nested(&sb_dqopt(sb)->files[cnt]->i_mutex,
 194                                   I_MUTEX_QUOTA);
 195                 truncate_inode_pages(&sb_dqopt(sb)->files[cnt]->i_data, 0);
 196                 mutex_unlock(&sb_dqopt(sb)->files[cnt]->i_mutex);
 197         }
 198         mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
 199 }
 200 #endif
 201
 202 static void sync_dquots(int type)
 203 {
 204         struct super_block *sb;
 205         int cnt;
 206
 207         spin_lock(&sb_lock);
 208 restart:
 209         list_for_each_entry(sb, &super_blocks, s_list) {
 210                 /* This test just improves performance so it needn't be
 211                  * reliable... */
 212                 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
 213                         if (type != -1 && type != cnt)
 214                                 continue;
 215                         if (!sb_has_quota_active(sb, cnt))
 216                                 continue;
 217                         if (!info_dirty(&sb_dqopt(sb)->info[cnt]) &&
 218                            list_empty(&sb_dqopt(sb)->info[cnt].dqi_dirty_list))
 219                                 continue;
 220                         break;
 221                 }
 222                 if (cnt == MAXQUOTAS)
 223                         continue;
 224                 sb->s_count++;
 225                 spin_unlock(&sb_lock);
 226                 down_read(&sb->s_umount);
 227                 if (sb->s_root)
 228                         sync_quota_sb(sb, type);
 229                 up_read(&sb->s_umount);
 230                 spin_lock(&sb_lock);
 231                 if (__put_super_and_need_restart(sb))
 232                         goto restart;
 233         }
 234         spin_unlock(&sb_lock);
 235 }
 236
 237 static int quota_quotaon(struct super_block *sb, int type, int cmd, qid_t id,
 238                          void __user *addr)
 239 {
 240         char *pathname;
 241         int ret;
 242
 243         pathname = getname(addr);
 244         if (IS_ERR(pathname))
 245                 return PTR_ERR(pathname);
 246         ret = sb->s_qcop->quota_on(sb, type, id, pathname, 0);
 247         putname(pathname);
 248         return ret;
 249 }
 250
 251 static int quota_getfmt(struct super_block *sb, int type, void __user *addr)
 252 {
 253         __u32 fmt;
 254
 255         down_read(&sb_dqopt(sb)->dqptr_sem);
 256         if (!sb_has_quota_active(sb, type)) {
 257                 up_read(&sb_dqopt(sb)->dqptr_sem);
 258                 return -ESRCH;
 259         }
 260         fmt = sb_dqopt(sb)->info[type].dqi_format->qf_fmt_id;
 261         up_read(&sb_dqopt(sb)->dqptr_sem);
 262         if (copy_to_user(addr, &fmt, sizeof(fmt)))
 263                 return -EFAULT;
 264         return 0;
 265 }
 266
 267 static int quota_getinfo(struct super_block *sb, int type, void __user *addr)
 268 {
 269         struct if_dqinfo info;
 270         int ret;
 271
 272         ret = sb->s_qcop->get_info(sb, type, &info);
 273         if (!ret && copy_to_user(addr, &info, sizeof(info)))
 274                 return -EFAULT;
 275         return ret;
 276 }
 277
 278 static int quota_setinfo(struct super_block *sb, int type, void __user *addr)
 279 {
 280         struct if_dqinfo info;
 281
 282         if (copy_from_user(&info, addr, sizeof(info)))
 283                 return -EFAULT;
 284         return sb->s_qcop->set_info(sb, type, &info);
 285 }
 286
 287 static int quota_getquota(struct super_block *sb, int type, qid_t id,
 288                           void __user *addr)
 289 {
 290         struct if_dqblk idq;
 291         int ret;
 292
 293         ret = sb->s_qcop->get_dqblk(sb, type, id, &idq);
 294         if (ret)
 295                 return ret;
 296         if (copy_to_user(addr, &idq, sizeof(idq)))
 297                 return -EFAULT;
 298         return 0;
 299 }
 300
 301 static int quota_setquota(struct super_block *sb, int type, qid_t id,
 302                           void __user *addr)
 303 {
 304         struct if_dqblk idq;
 305
 306         if (copy_from_user(&idq, addr, sizeof(idq)))
 307                 return -EFAULT;
 308         return sb->s_qcop->set_dqblk(sb, type, id, &idq);
 309 }
 310
 311 static int quota_setxstate(struct super_block *sb, int cmd, void __user *addr)
 312 {
 313         __u32 flags;
 314
 315         if (copy_from_user(&flags, addr, sizeof(flags)))
 316                 return -EFAULT;
 317         return sb->s_qcop->set_xstate(sb, flags, cmd);
 318 }
 319
 320 static int quota_getxstate(struct super_block *sb, void __user *addr)
 321 {
 322         struct fs_quota_stat fqs;
 323         int ret;
 324
 325         ret = sb->s_qcop->get_xstate(sb, &fqs);
 326         if (!ret && copy_to_user(addr, &fqs, sizeof(fqs)))
 327                 return -EFAULT;
 328         return ret;
 329 }
 330
 331 static int quota_setxquota(struct super_block *sb, int type, qid_t id,
 332                            void __user *addr)
 333 {
 334         struct fs_disk_quota fdq;
 335
 336         if (copy_from_user(&fdq, addr, sizeof(fdq)))
 337                 return -EFAULT;
 338         return sb->s_qcop->set_xquota(sb, type, id, &fdq);
 339 }
 340
 341 static int quota_getxquota(struct super_block *sb, int type, qid_t id,
 342                            void __user *addr)
 343 {
 344         struct fs_disk_quota fdq;
 345         int ret;
 346
 347         ret = sb->s_qcop->get_xquota(sb, type, id, &fdq);
 348         if (!ret && copy_to_user(addr, &fdq, sizeof(fdq)))
 349                 return -EFAULT;
 350         return ret;
 351 }
 352
 353 /* Copy parameters and call proper function */
 354 static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id,
 355                        void __user *addr)
 356 {
 357         switch (cmd) {
 358         case Q_QUOTAON:
 359                 return quota_quotaon(sb, type, cmd, id, addr);
 360         case Q_QUOTAOFF:
 361                 return sb->s_qcop->quota_off(sb, type, 0);
 362         case Q_GETFMT:
 363                 return quota_getfmt(sb, type, addr);
 364         case Q_GETINFO:
 365                 return quota_getinfo(sb, type, addr);
 366         case Q_SETINFO:
 367                 return quota_setinfo(sb, type, addr);
 368         case Q_GETQUOTA:
 369                 return quota_getquota(sb, type, id, addr);
 370         case Q_SETQUOTA:
 371                 return quota_setquota(sb, type, id, addr);
 372         case Q_SYNC:
 373                 if (sb)
 374                         sync_quota_sb(sb, type);
 375                 else
 376                         sync_dquots(type);
 377                 return 0;
 378         case Q_XQUOTAON:
 379         case Q_XQUOTAOFF:
 380         case Q_XQUOTARM:
 381                 return quota_setxstate(sb, cmd, addr);
 382         case Q_XGETQSTAT:
 383                 return quota_getxstate(sb, addr);
 384         case Q_XSETQLIM:
 385                 return quota_setxquota(sb, type, id, addr);
 386         case Q_XGETQUOTA:
 387                 return quota_getxquota(sb, type, id, addr);
 388         case Q_XQUOTASYNC:
 389                 return sb->s_qcop->quota_sync(sb, type);
 390         /* We never reach here unless validity check is broken */
 391         default:
 392                 BUG();
 393         }
 394
 395         return 0;
 396 }
 397
 398 /*
 399  * look up a superblock on which quota ops will be performed
 400  * - use the name of a block device to find the superblock thereon
 401  */
 402 static struct super_block *quotactl_block(const char __user *special)
 403 {
 404 #ifdef CONFIG_BLOCK
 405         struct block_device *bdev;
 406         struct super_block *sb;
 407         char *tmp = getname(special);
 408
 409         if (IS_ERR(tmp))
 410                 return ERR_CAST(tmp);
 411         bdev = lookup_bdev(tmp);
 412         putname(tmp);
 413         if (IS_ERR(bdev))
 414                 return ERR_CAST(bdev);
 415         sb = get_super(bdev);
 416         bdput(bdev);
 417         if (!sb)
 418                 return ERR_PTR(-ENODEV);
 419
 420         return sb;
 421 #else
 422         return ERR_PTR(-ENODEV);
 423 #endif
 424 }
 425
 426 /*
 427  * This is the system call interface. This communicates with
 428  * the user-level programs. Currently this only supports diskquota
 429  * calls. Maybe we need to add the process quotas etc. in the future,
 430  * but we probably should use rlimits for that.
 431  */
 432 SYSCALL_DEFINE4(quotactl, unsigned int, cmd, const char __user *, special,
 433                 qid_t, id, void __user *, addr)
 434 {
 435         uint cmds, type;
 436         struct super_block *sb = NULL;
 437         int ret;
 438
 439         cmds = cmd >> SUBCMDSHIFT;
 440         type = cmd & SUBCMDMASK;
 441
 442         if (cmds != Q_SYNC || special) {
 443                 sb = quotactl_block(special);
 444                 if (IS_ERR(sb))
 445                         return PTR_ERR(sb);
 446         }
 447
 448         ret = check_quotactl_valid(sb, type, cmds, id);
 449         if (ret >= 0)
 450                 ret = do_quotactl(sb, type, cmds, id, addr);
 451         if (sb)
 452                 drop_super(sb);
 453
 454         return ret;
 455 }
 456
 457 #if defined(CONFIG_COMPAT_FOR_U64_ALIGNMENT)
 458 /*
 459  * This code works only for 32 bit quota tools over 64 bit OS (x86_64, ia64)
 460  * and is necessary due to alignment problems.
 461  */
 462 struct compat_if_dqblk {
 463         compat_u64 dqb_bhardlimit;
 464         compat_u64 dqb_bsoftlimit;
 465         compat_u64 dqb_curspace;
 466         compat_u64 dqb_ihardlimit;
 467         compat_u64 dqb_isoftlimit;
 468         compat_u64 dqb_curinodes;
 469         compat_u64 dqb_btime;
 470         compat_u64 dqb_itime;
 471         compat_uint_t dqb_valid;
 472 };
 473
 474 /* XFS structures */
 475 struct compat_fs_qfilestat {
 476         compat_u64 dqb_bhardlimit;
 477         compat_u64 qfs_nblks;
 478         compat_uint_t qfs_nextents;
 479 };
 480
 481 struct compat_fs_quota_stat {
 482         __s8            qs_version;
 483         __u16           qs_flags;
 484         __s8            qs_pad;
 485         struct compat_fs_qfilestat      qs_uquota;
 486         struct compat_fs_qfilestat      qs_gquota;
 487         compat_uint_t   qs_incoredqs;
 488         compat_int_t    qs_btimelimit;
 489         compat_int_t    qs_itimelimit;
 490         compat_int_t    qs_rtbtimelimit;
 491         __u16           qs_bwarnlimit;
 492         __u16           qs_iwarnlimit;
 493 };
 494
 495 asmlinkage long sys32_quotactl(unsigned int cmd, const char __user *special,
 496                                                 qid_t id, void __user *addr)
 497 {
 498         unsigned int cmds;
 499         struct if_dqblk __user *dqblk;
 500         struct compat_if_dqblk __user *compat_dqblk;
 501         struct fs_quota_stat __user *fsqstat;
 502         struct compat_fs_quota_stat __user *compat_fsqstat;
 503         compat_uint_t data;
 504         u16 xdata;
 505         long ret;
 506
 507         cmds = cmd >> SUBCMDSHIFT;
 508
 509         switch (cmds) {
 510         case Q_GETQUOTA:
 511                 dqblk = compat_alloc_user_space(sizeof(struct if_dqblk));
 512                 compat_dqblk = addr;
 513                 ret = sys_quotactl(cmd, special, id, dqblk);
 514                 if (ret)
 515                         break;
 516                 if (copy_in_user(compat_dqblk, dqblk, sizeof(*compat_dqblk)) ||
 517                         get_user(data, &dqblk->dqb_valid) ||
 518                         put_user(data, &compat_dqblk->dqb_valid))
 519                         ret = -EFAULT;
 520                 break;
 521         case Q_SETQUOTA:
 522                 dqblk = compat_alloc_user_space(sizeof(struct if_dqblk));
 523                 compat_dqblk = addr;
 524                 ret = -EFAULT;
 525                 if (copy_in_user(dqblk, compat_dqblk, sizeof(*compat_dqblk)) ||
 526                         get_user(data, &compat_dqblk->dqb_valid) ||
 527                         put_user(data, &dqblk->dqb_valid))
 528                         break;
 529                 ret = sys_quotactl(cmd, special, id, dqblk);
 530                 break;
 531         case Q_XGETQSTAT:
 532                 fsqstat = compat_alloc_user_space(sizeof(struct fs_quota_stat));
 533                 compat_fsqstat = addr;
 534                 ret = sys_quotactl(cmd, special, id, fsqstat);
 535                 if (ret)
 536                         break;
 537                 ret = -EFAULT;
 538                 /* Copying qs_version, qs_flags, qs_pad */
 539                 if (copy_in_user(compat_fsqstat, fsqstat,
 540                         offsetof(struct compat_fs_quota_stat, qs_uquota)))
 541                         break;
 542                 /* Copying qs_uquota */
 543                 if (copy_in_user(&compat_fsqstat->qs_uquota,
 544                         &fsqstat->qs_uquota,
 545                         sizeof(compat_fsqstat->qs_uquota)) ||
 546                         get_user(data, &fsqstat->qs_uquota.qfs_nextents) ||
 547                         put_user(data, &compat_fsqstat->qs_uquota.qfs_nextents))
 548                         break;
 549                 /* Copying qs_gquota */
 550                 if (copy_in_user(&compat_fsqstat->qs_gquota,
 551                         &fsqstat->qs_gquota,
 552                         sizeof(compat_fsqstat->qs_gquota)) ||
 553                         get_user(data, &fsqstat->qs_gquota.qfs_nextents) ||
 554                         put_user(data, &compat_fsqstat->qs_gquota.qfs_nextents))
 555                         break;
 556                 /* Copying the rest */
 557                 if (copy_in_user(&compat_fsqstat->qs_incoredqs,
 558                         &fsqstat->qs_incoredqs,
 559                         sizeof(struct compat_fs_quota_stat) -
 560                         offsetof(struct compat_fs_quota_stat, qs_incoredqs)) ||
 561                         get_user(xdata, &fsqstat->qs_iwarnlimit) ||
 562                         put_user(xdata, &compat_fsqstat->qs_iwarnlimit))
 563                         break;
 564                 ret = 0;
 565                 break;
 566         default:
 567                 ret = sys_quotactl(cmd, special, id, addr);
 568         }
 569         return ret;
 570 }
 571 #endif
 572
 573
 574 #ifdef CONFIG_QUOTA_NETLINK_INTERFACE
 575
 576 /* Netlink family structure for quota */
 577 static struct genl_family quota_genl_family = {
 578         .id = GENL_ID_GENERATE,
 579         .hdrsize = 0,
 580         .name = "VFS_DQUOT",
 581         .version = 1,
 582         .maxattr = QUOTA_NL_A_MAX,
 583 };
 584
 585 /**
 586  * quota_send_warning - Send warning to userspace about exceeded quota
 587  * @type: The quota type: USRQQUOTA, GRPQUOTA,...
 588  * @id: The user or group id of the quota that was exceeded
 589  * @dev: The device on which the fs is mounted (sb->s_dev)
 590  * @warntype: The type of the warning: QUOTA_NL_...
 591  *
 592  * This can be used by filesystems (including those which don't use
 593  * dquot) to send a message to userspace relating to quota limits.
 594  *
 595  */
 596
 597 void quota_send_warning(short type, unsigned int id, dev_t dev,
 598                         const char warntype)
 599 {
 600         static atomic_t seq;
 601         struct sk_buff *skb;
 602         void *msg_head;
 603         int ret;
 604         int msg_size = 4 * nla_total_size(sizeof(u32)) +
 605                        2 * nla_total_size(sizeof(u64));
 606
 607         /* We have to allocate using GFP_NOFS as we are called from a
 608          * filesystem performing write and thus further recursion into
 609          * the fs to free some data could cause deadlocks. */
 610         skb = genlmsg_new(msg_size, GFP_NOFS);
 611         if (!skb) {
 612                 printk(KERN_ERR
 613                   "VFS: Not enough memory to send quota warning.\n");
 614                 return;
 615         }
 616         msg_head = genlmsg_put(skb, 0, atomic_add_return(1, &seq),
 617                         &quota_genl_family, 0, QUOTA_NL_C_WARNING);
 618         if (!msg_head) {
 619                 printk(KERN_ERR
 620                   "VFS: Cannot store netlink header in quota warning.\n");
 621                 goto err_out;
 622         }
 623         ret = nla_put_u32(skb, QUOTA_NL_A_QTYPE, type);
 624         if (ret)
 625                 goto attr_err_out;
 626         ret = nla_put_u64(skb, QUOTA_NL_A_EXCESS_ID, id);
 627         if (ret)
 628                 goto attr_err_out;
 629         ret = nla_put_u32(skb, QUOTA_NL_A_WARNING, warntype);
 630         if (ret)
 631                 goto attr_err_out;
 632         ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MAJOR, MAJOR(dev));
 633         if (ret)
 634                 goto attr_err_out;
 635         ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MINOR, MINOR(dev));
 636         if (ret)
 637                 goto attr_err_out;
 638         ret = nla_put_u64(skb, QUOTA_NL_A_CAUSED_ID, current_uid());
 639         if (ret)
 640                 goto attr_err_out;
 641         genlmsg_end(skb, msg_head);
 642
 643         genlmsg_multicast(skb, 0, quota_genl_family.id, GFP_NOFS);
 644         return;
 645 attr_err_out:
 646         printk(KERN_ERR "VFS: Not enough space to compose quota message!\n");
 647 err_out:
 648         kfree_skb(skb);
 649 }
 650 EXPORT_SYMBOL(quota_send_warning);
 651
 652 static int __init quota_init(void)
 653 {
 654         if (genl_register_family(&quota_genl_family) != 0)
 655                 printk(KERN_ERR
 656                        "VFS: Failed to create quota netlink interface.\n");
 657         return 0;
 658 };
 659
 660 module_init(quota_init);
 661 #endif
 662