ldiskfs/kernel_patches/patches/ubuntu14+16/ext4-data-in-dirent.patch

   1 diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c
   2 index 1d1bca7..df2a96d 100644
   3 --- a/fs/ext4/dir.c
   4 +++ b/fs/ext4/dir.c
   5 @@ -67,11 +67,11 @@ int __ext4_check_dir_entry(const char *function, unsigned int line,
   6         const int rlen = ext4_rec_len_from_disk(de->rec_len,
   7                                                 dir->i_sb->s_blocksize);
   8
   9 -       if (unlikely(rlen < EXT4_DIR_REC_LEN(1)))
  10 +       if (unlikely(rlen < __EXT4_DIR_REC_LEN(1)))
  11                 error_msg = "rec_len is smaller than minimal";
  12         else if (unlikely(rlen % 4 != 0))
  13                 error_msg = "rec_len % 4 != 0";
  14 -       else if (unlikely(rlen < EXT4_DIR_REC_LEN(de->name_len)))
  15 +       else if (unlikely(rlen < EXT4_DIR_REC_LEN(de)))
  16                 error_msg = "rec_len is too small for name_len";
  17         else if (unlikely(((char *) de - buf) + rlen > size))
  18                 error_msg = "directory entry across range";
  19 @@ -205,7 +205,7 @@ static int ext4_readdir(struct file *file, struct dir_context *ctx)
  20                                  * failure will be detected in the
  21                                  * dirent test below. */
  22                                 if (ext4_rec_len_from_disk(de->rec_len,
  23 -                                       sb->s_blocksize) < EXT4_DIR_REC_LEN(1))
  24 +                                   sb->s_blocksize) < __EXT4_DIR_REC_LEN(1))
  25                                         break;
  26                                 i += ext4_rec_len_from_disk(de->rec_len,
  27                                                             sb->s_blocksize);
  28 @@ -424,12 +424,17 @@ int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
  29         struct fname *fname, *new_fn;
  30         struct dir_private_info *info;
  31         int len;
  32 +       int extra_data = 0;
  33
  34         info = dir_file->private_data;
  35         p = &info->root.rb_node;
  36
  37         /* Create and allocate the fname structure */
  38 -       len = sizeof(struct fname) + ent_name->len + 1;
  39 +       if (dirent->file_type & EXT4_DIRENT_LUFID)
  40 +               extra_data = ext4_get_dirent_data_len(dirent);
  41 +
  42 +       len = sizeof(struct fname) + ent_name->len + extra_data + 1;
  43 +
  44         new_fn = kzalloc(len, GFP_KERNEL);
  45         if (!new_fn)
  46                 return -ENOMEM;
  47 @@ -438,7 +443,7 @@ int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
  48         new_fn->inode = le32_to_cpu(dirent->inode);
  49         new_fn->name_len = ent_name->len;
  50         new_fn->file_type = dirent->file_type;
  51 -       memcpy(new_fn->name, ent_name->name, ent_name->len);
  52 +       memcpy(new_fn->name, ent_name->name, ent_name->len + extra_data);
  53         new_fn->name[ent_name->len] = 0;
  54
  55         while (*p) {
  56 @@ -621,7 +626,7 @@ int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, void *buf,
  57                 if (ext4_check_dir_entry(dir, NULL, de, bh,
  58                                          buf, buf_size, offset))
  59                         return -EFSCORRUPTED;
  60 -               nlen = EXT4_DIR_REC_LEN(de->name_len);
  61 +               nlen = EXT4_DIR_REC_LEN(de);
  62                 rlen = ext4_rec_len_from_disk(de->rec_len, buf_size);
  63                 de = (struct ext4_dir_entry_2 *)((char *)de + rlen);
  64                 offset += rlen;
  65 diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
  66 index 613538c..10a2a86 100644
  67 --- a/fs/ext4/ext4.h
  68 +++ b/fs/ext4/ext4.h
  69 @@ -1069,6 +1069,7 @@ struct ext4_inode_info {
  70  #define EXT4_MOUNT_POSIX_ACL           0x08000 /* POSIX Access Control Lists */
  71  #define EXT4_MOUNT_NO_AUTO_DA_ALLOC    0x10000 /* No auto delalloc mapping */
  72  #define EXT4_MOUNT_BARRIER             0x20000 /* Use block barriers */
  73 +#define EXT4_MOUNT_DIRDATA             0x40000 /* Data in directory entries*/
  74  #define EXT4_MOUNT_QUOTA               0x80000 /* Some quota option set */
  75  #define EXT4_MOUNT_USRQUOTA            0x100000 /* "old" user quota */
  76  #define EXT4_MOUNT_GRPQUOTA            0x200000 /* "old" group quota */
  77 @@ -1781,6 +1782,7 @@ EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,              ENCRYPT)
  78                                          EXT4_FEATURE_INCOMPAT_64BIT| \
  79                                          EXT4_FEATURE_INCOMPAT_FLEX_BG| \
  80                                          EXT4_FEATURE_INCOMPAT_MMP | \
  81 +                                        EXT4_FEATURE_INCOMPAT_DIRDATA| \
  82                                          EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
  83                                          EXT4_FEATURE_INCOMPAT_ENCRYPT | \
  84                                          EXT4_FEATURE_INCOMPAT_CSUM_SEED)
  85 @@ -1937,6 +1939,43 @@ struct ext4_dir_entry_tail {
  86  #define EXT4_FT_SYMLINK                7
  87
  88  #define EXT4_FT_MAX            8
  89 +#define EXT4_FT_MASK           0xf
  90 +
  91 +#if EXT4_FT_MAX > EXT4_FT_MASK
  92 +#error "conflicting EXT4_FT_MAX and EXT4_FT_MASK"
  93 +#endif
  94 +
  95 +/*
  96 + * d_type has 4 unused bits, so it can hold four types data. these different
  97 + * type of data (e.g. lustre data, high 32 bits of 64-bit inode number) can be
  98 + * stored, in flag order, after file-name in ext4 dirent.
  99 +*/
 100 +/*
 101 + * this flag is added to d_type if ext4 dirent has extra data after
 102 + * filename. this data length is variable and length is stored in first byte
 103 + * of data. data start after filename NUL byte.
 104 + * This is used by Lustre FS.
 105 +  */
 106 +#define EXT4_DIRENT_LUFID              0x10
 107 +
 108 +#define EXT4_LUFID_MAGIC    0xAD200907UL
 109 +struct ext4_dentry_param {
 110 +       __u32  edp_magic;       /* EXT4_LUFID_MAGIC */
 111 +       char   edp_len;         /* size of edp_data in bytes */
 112 +       char   edp_data[0];     /* packed array of data */
 113 +} __packed;
 114 +
 115 +static inline unsigned char *ext4_dentry_get_data(struct super_block *sb,
 116 +                                                 struct ext4_dentry_param *p)
 117 +
 118 +{
 119 +       if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_DIRDATA))
 120 +               return NULL;
 121 +       if (p && p->edp_magic == EXT4_LUFID_MAGIC)
 122 +               return &p->edp_len;
 123 +       else
 124 +               return NULL;
 125 +}
 126
 127  #define EXT4_FT_DIR_CSUM       0xDE
 128
 129 @@ -1947,8 +1986,11 @@ struct ext4_dir_entry_tail {
 130   */
 131  #define EXT4_DIR_PAD                   4
 132  #define EXT4_DIR_ROUND                 (EXT4_DIR_PAD - 1)
 133 -#define EXT4_DIR_REC_LEN(name_len)     (((name_len) + 8 + EXT4_DIR_ROUND) & \
 134 +#define __EXT4_DIR_REC_LEN(name_len)   (((name_len) + 8 + EXT4_DIR_ROUND) & \
 135                                          ~EXT4_DIR_ROUND)
 136 +#define EXT4_DIR_REC_LEN(de)           (__EXT4_DIR_REC_LEN((de)->name_len +\
 137 +                                       ext4_get_dirent_data_len(de)))
 138 +
 139  #define EXT4_MAX_REC_LEN               ((1<<16)-1)
 140
 141  /*
 142 @@ -2407,12 +2449,12 @@ extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
 143                              struct buffer_head *bh,
 144                              void *buf, int buf_size,
 145                              struct ext4_filename *fname,
 146 -                            struct ext4_dir_entry_2 **dest_de);
 147 +                            struct ext4_dir_entry_2 **dest_de, int *dlen);
 148  int ext4_insert_dentry(struct inode *dir,
 149                        struct inode *inode,
 150                        struct ext4_dir_entry_2 *de,
 151                        int buf_size,
 152 -                      struct ext4_filename *fname);
 153 +                      struct ext4_filename *fname, void *data);
 154  static inline void ext4_update_dx_flag(struct inode *inode)
 155  {
 156         if (!ext4_has_feature_dir_index(inode->i_sb))
 157 @@ -2424,10 +2466,17 @@ static unsigned char ext4_filetype_table[] = {
 158
 159  static inline  unsigned char get_dtype(struct super_block *sb, int filetype)
 160  {
 161 -       if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
 162 +       int fl_index = filetype & EXT4_FT_MASK;
 163 +
 164 +       if (!ext4_has_feature_filetype(sb) || fl_index >= EXT4_FT_MAX)
 165                 return DT_UNKNOWN;
 166
 167 -       return ext4_filetype_table[filetype];
 168 +       if (!test_opt(sb, DIRDATA))
 169 +               return ext4_filetype_table[fl_index];
 170 +
 171 +       return (ext4_filetype_table[fl_index]) |
 172 +               (filetype & EXT4_DIRENT_LUFID);
 173 +
 174  }
 175  extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
 176                              void *buf, int buf_size);
 177 @@ -2575,6 +2624,8 @@ extern struct inode *ext4_create_inode(handle_t *handle,
 178  extern int ext4_delete_entry(handle_t *handle, struct inode * dir,
 179                              struct ext4_dir_entry_2 *de_del,
 180                              struct buffer_head *bh);
 181 +extern int ext4_add_dot_dotdot(handle_t *handle, struct inode *dir,
 182 +                              struct inode *inode, const void *, const void *);
 183  extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
 184                                 __u32 start_minor_hash, __u32 *next_hash);
 185  extern int ext4_search_dir(struct buffer_head *bh,
 186 @@ -3292,6 +3343,28 @@ extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
 187  extern int ext4_resize_begin(struct super_block *sb);
 188  extern void ext4_resize_end(struct super_block *sb);
 189
 190 +/*
 191 + * Compute the total directory entry data length.
 192 + * This includes the filename and an implicit NUL terminator (always present),
 193 + * and optional extensions.  Each extension has a bit set in the high 4 bits of
 194 + * de->file_type, and the extension length is the first byte in each entry.
 195 + */
 196 +static inline int ext4_get_dirent_data_len(struct ext4_dir_entry_2 *de)
 197 +{
 198 +       char *len = de->name + de->name_len + 1 /* NUL terminator */;
 199 +       int dlen = 0;
 200 +       __u8 extra_data_flags = (de->file_type & ~EXT4_FT_MASK) >> 4;
 201 +
 202 +       while (extra_data_flags) {
 203 +               if (extra_data_flags & 1) {
 204 +                       dlen += *len + (dlen == 0);
 205 +                       len += *len;
 206 +               }
 207 +               extra_data_flags >>= 1;
 208 +       }
 209 +       return dlen;
 210 +}
 211 +
 212  #endif /* __KERNEL__ */
 213
 214  #define EFSBADCRC      EBADMSG         /* Bad CRC detected */
 215 diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c
 216 index d884989..53e8a88 100644
 217 --- a/fs/ext4/inline.c
 218 +++ b/fs/ext4/inline.c
 219 @@ -1005,7 +1005,7 @@ static int ext4_add_dirent_to_inline(handle_t *handle,
 220         struct ext4_dir_entry_2 *de;
 221
 222         err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
 223 -                               inline_size, fname, &de);
 224 +                               inline_size, fname, &de, NULL);
 225         if (err)
 226                 return err;
 227
 228 @@ -1013,7 +1013,7 @@ static int ext4_add_dirent_to_inline(handle_t *handle,
 229         err = ext4_journal_get_write_access(handle, iloc->bh);
 230         if (err)
 231                 return err;
 232 -       ext4_insert_dentry(dir, inode, de, inline_size, fname);
 233 +       ext4_insert_dentry(dir, inode, de, inline_size, fname, NULL);
 234
 235         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
 236
 237 @@ -1083,7 +1083,7 @@ static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
 238         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
 239         int new_size = get_max_inline_xattr_value_size(dir, iloc);
 240
 241 -       if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
 242 +       if (new_size - old_size <= __EXT4_DIR_REC_LEN(1))
 243                 return -ENOSPC;
 244
 245         ret = ext4_update_inline_data(handle, dir,
 246 @@ -1366,7 +1366,7 @@ int htree_inlinedir_to_tree(struct file *dir_file,
 247                         fake.name_len = 1;
 248                         strcpy(fake.name, ".");
 249                         fake.rec_len = ext4_rec_len_to_disk(
 250 -                                               EXT4_DIR_REC_LEN(fake.name_len),
 251 +                                               EXT4_DIR_REC_LEN(&fake),
 252                                                 inline_size);
 253                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
 254                         de = &fake;
 255 @@ -1376,7 +1376,7 @@ int htree_inlinedir_to_tree(struct file *dir_file,
 256                         fake.name_len = 2;
 257                         strcpy(fake.name, "..");
 258                         fake.rec_len = ext4_rec_len_to_disk(
 259 -                                               EXT4_DIR_REC_LEN(fake.name_len),
 260 +                                               EXT4_DIR_REC_LEN(&fake),
 261                                                 inline_size);
 262                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
 263                         de = &fake;
 264 @@ -1474,8 +1474,8 @@ int ext4_read_inline_dir(struct file *file,
 265          * So we will use extra_offset and extra_size to indicate them
 266          * during the inline dir iteration.
 267          */
 268 -       dotdot_offset = EXT4_DIR_REC_LEN(1);
 269 -       dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
 270 +       dotdot_offset = __EXT4_DIR_REC_LEN(1);
 271 +       dotdot_size = dotdot_offset + __EXT4_DIR_REC_LEN(2);
 272         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
 273         extra_size = extra_offset + inline_size;
 274
 275 @@ -1510,7 +1510,7 @@ int ext4_read_inline_dir(struct file *file,
 276                          * failure will be detected in the
 277                          * dirent test below. */
 278                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
 279 -                               < EXT4_DIR_REC_LEN(1))
 280 +                               < __EXT4_DIR_REC_LEN(1))
 281                                 break;
 282                         i += ext4_rec_len_from_disk(de->rec_len,
 283                                                     extra_size);
 284 diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
 285 index 73d73fb..f6465b6 100644
 286 --- a/fs/ext4/namei.c
 287 +++ b/fs/ext4/namei.c
 288 @@ -241,7 +241,8 @@ static unsigned dx_get_count(struct dx_entry *entries);
 289  static unsigned dx_get_limit(struct dx_entry *entries);
 290  static void dx_set_count(struct dx_entry *entries, unsigned value);
 291  static void dx_set_limit(struct dx_entry *entries, unsigned value);
 292 -static unsigned dx_root_limit(struct inode *dir, unsigned infosize);
 293 +static inline unsigned dx_root_limit(struct inode *dir,
 294 +               struct ext4_dir_entry_2 *dot_de, unsigned infosize);
 295  static unsigned dx_node_limit(struct inode *dir);
 296  static struct dx_frame *dx_probe(struct ext4_filename *fname,
 297                                  struct inode *dir,
 298 @@ -504,11 +505,12 @@ ext4_next_entry(struct ext4_dir_entry_2 *p, unsigned long blocksize)
 299   */
 300  struct dx_root_info *dx_get_dx_info(struct ext4_dir_entry_2 *de)
 301  {
 302 +       BUG_ON(de->name_len != 1);
 303         /* get dotdot first */
 304 -       de = (struct ext4_dir_entry_2 *)((char *)de + EXT4_DIR_REC_LEN(1));
 305 +       de = (struct ext4_dir_entry_2 *)((char *)de + EXT4_DIR_REC_LEN(de));
 306
 307         /* dx root info is after dotdot entry */
 308 -       de = (struct ext4_dir_entry_2 *)((char *)de + EXT4_DIR_REC_LEN(2));
 309 +       de = (struct ext4_dir_entry_2 *)((char *)de + EXT4_DIR_REC_LEN(de));
 310
 311         return (struct dx_root_info *)de;
 312  }
 313 @@ -553,10 +555,16 @@ static inline void dx_set_limit(struct dx_entry *entries, unsigned value)
 314         ((struct dx_countlimit *) entries)->limit = cpu_to_le16(value);
 315  }
 316
 317 -static inline unsigned dx_root_limit(struct inode *dir, unsigned infosize)
 318 +static inline unsigned dx_root_limit(struct inode *dir,
 319 +               struct ext4_dir_entry_2 *dot_de, unsigned infosize)
 320  {
 321 -       unsigned entry_space = dir->i_sb->s_blocksize - EXT4_DIR_REC_LEN(1) -
 322 -               EXT4_DIR_REC_LEN(2) - infosize;
 323 +       struct ext4_dir_entry_2 *dotdot_de;
 324 +       unsigned entry_space;
 325 +
 326 +       BUG_ON(dot_de->name_len != 1);
 327 +       dotdot_de = ext4_next_entry(dot_de, dir->i_sb->s_blocksize);
 328 +       entry_space = dir->i_sb->s_blocksize - EXT4_DIR_REC_LEN(dot_de) -
 329 +                        EXT4_DIR_REC_LEN(dotdot_de) - infosize;
 330
 331         if (ext4_has_metadata_csum(dir->i_sb))
 332                 entry_space -= sizeof(struct dx_tail);
 333 @@ -565,7 +573,7 @@ static inline unsigned dx_root_limit(struct inode *dir, unsigned infosize)
 334
 335  static inline unsigned dx_node_limit(struct inode *dir)
 336  {
 337 -       unsigned entry_space = dir->i_sb->s_blocksize - EXT4_DIR_REC_LEN(0);
 338 +       unsigned entry_space = dir->i_sb->s_blocksize - __EXT4_DIR_REC_LEN(0);
 339
 340         if (ext4_has_metadata_csum(dir->i_sb))
 341                 entry_space -= sizeof(struct dx_tail);
 342 @@ -674,7 +682,7 @@ static struct stats dx_show_leaf(struct inode *dir,
 343                                        (unsigned) ((char *) de - base));
 344  #endif
 345                         }
 346 -                       space += EXT4_DIR_REC_LEN(de->name_len);
 347 +                       space += EXT4_DIR_REC_LEN(de);
 348                         names++;
 349                 }
 350                 de = ext4_next_entry(de, size);
 351 @@ -775,11 +783,14 @@ dx_probe(struct ext4_filename *fname, struct inode *dir,
 352
 353         entries = (struct dx_entry *)(((char *)info) + info->info_length);
 354
 355 -       if (dx_get_limit(entries) != dx_root_limit(dir,
 356 -                                                  info->info_length)) {
 357 +       if (dx_get_limit(entries) !=
 358 +           dx_root_limit(dir, (struct ext4_dir_entry_2 *)frame->bh->b_data,
 359 +                         info->info_length)) {
 360                 ext4_warning_inode(dir, "dx entry: limit %u != root limit %u",
 361                                    dx_get_limit(entries),
 362 -                                  dx_root_limit(dir, info->info_length));
 363 +                                  dx_root_limit(dir,
 364 +                                         (struct ext4_dir_entry_2 *)frame->bh->b_data,
 365 +                                         info->info_length));
 366                 goto fail;
 367         }
 368
 369 @@ -963,7 +974,7 @@ static int htree_dirblock_to_tree(struct file *dir_file,
 370         de = (struct ext4_dir_entry_2 *) bh->b_data;
 371         top = (struct ext4_dir_entry_2 *) ((char *) de +
 372                                            dir->i_sb->s_blocksize -
 373 -                                          EXT4_DIR_REC_LEN(0));
 374 +                                          __EXT4_DIR_REC_LEN(0));
 375  #ifdef CONFIG_EXT4_FS_ENCRYPTION
 376         /* Check if the directory is encrypted */
 377         if (ext4_encrypted_inode(dir)) {
 378 @@ -1665,7 +1676,7 @@ dx_move_dirents(char *from, char *to, struct dx_map_entry *map, int count,
 379         while (count--) {
 380                 struct ext4_dir_entry_2 *de = (struct ext4_dir_entry_2 *)
 381                                                 (from + (map->offs<<2));
 382 -               rec_len = EXT4_DIR_REC_LEN(de->name_len);
 383 +               rec_len = EXT4_DIR_REC_LEN(de);
 384                 memcpy (to, de, rec_len);
 385                 ((struct ext4_dir_entry_2 *) to)->rec_len =
 386                                 ext4_rec_len_to_disk(rec_len, blocksize);
 387 @@ -1689,7 +1700,7 @@ static struct ext4_dir_entry_2* dx_pack_dirents(char *base, unsigned blocksize)
 388         while ((char*)de < base + blocksize) {
 389                 next = ext4_next_entry(de, blocksize);
 390                 if (de->inode && de->name_len) {
 391 -                       rec_len = EXT4_DIR_REC_LEN(de->name_len);
 392 +                       rec_len = EXT4_DIR_REC_LEN(de);
 393                         if (de > to)
 394                                 memmove(to, de, rec_len);
 395                         to->rec_len = ext4_rec_len_to_disk(rec_len, blocksize);
 396 @@ -1820,15 +1831,17 @@ int ext4_find_dest_de(struct inode *dir, struct inode *inode,
 397                       struct buffer_head *bh,
 398                       void *buf, int buf_size,
 399                       struct ext4_filename *fname,
 400 -                     struct ext4_dir_entry_2 **dest_de)
 401 +                     struct ext4_dir_entry_2 **dest_de, int *dlen)
 402  {
 403         struct ext4_dir_entry_2 *de;
 404 -       unsigned short reclen = EXT4_DIR_REC_LEN(fname_len(fname));
 405 +       unsigned short reclen = __EXT4_DIR_REC_LEN(fname_len(fname)) +
 406 +                                                 (dlen ? *dlen : 0);
 407         int nlen, rlen;
 408         unsigned int offset = 0;
 409         char *top;
 410         int res;
 411
 412 +       dlen ? *dlen = 0 : 0; /* default set to 0 */
 413         de = (struct ext4_dir_entry_2 *)buf;
 414         top = buf + buf_size - reclen;
 415         while ((char *) de <= top) {
 416 @@ -1845,10 +1858,26 @@ int ext4_find_dest_de(struct inode *dir, struct inode *inode,
 417                         res = -EEXIST;
 418                         goto return_result;
 419                 }
 420 -               nlen = EXT4_DIR_REC_LEN(de->name_len);
 421 +               nlen = EXT4_DIR_REC_LEN(de);
 422                 rlen = ext4_rec_len_from_disk(de->rec_len, buf_size);
 423                 if ((de->inode ? rlen - nlen : rlen) >= reclen)
 424                         break;
 425 +               /* Then for dotdot entries, check for the smaller space
 426 +                * required for just the entry, no FID */
 427 +               if (fname_len(fname) == 2 && memcmp(fname_name(fname), "..", 2) == 0) {
 428 +                       if ((de->inode ? rlen - nlen : rlen) >=
 429 +                           __EXT4_DIR_REC_LEN(fname_len(fname))) {
 430 +                               /* set dlen=1 to indicate not
 431 +                                * enough space store fid */
 432 +                               dlen ? *dlen = 1 : 0;
 433 +                               break;
 434 +                       }
 435 +                       /* The new ".." entry must be written over the
 436 +                        * previous ".." entry, which is the first
 437 +                        * entry traversed by this scan. If it doesn't
 438 +                        * fit, something is badly wrong, so -EIO. */
 439 +                       return -EIO;
 440 +               }
 441                 de = (struct ext4_dir_entry_2 *)((char *)de + rlen);
 442                 offset += rlen;
 443         }
 444 @@ -1867,12 +1896,12 @@ int ext4_insert_dentry(struct inode *dir,
 445                        struct inode *inode,
 446                        struct ext4_dir_entry_2 *de,
 447                        int buf_size,
 448 -                      struct ext4_filename *fname)
 449 +                      struct ext4_filename *fname, void *data)
 450  {
 451
 452         int nlen, rlen;
 453
 454 -       nlen = EXT4_DIR_REC_LEN(de->name_len);
 455 +       nlen = EXT4_DIR_REC_LEN(de);
 456         rlen = ext4_rec_len_from_disk(de->rec_len, buf_size);
 457         if (de->inode) {
 458                 struct ext4_dir_entry_2 *de1 =
 459 @@ -1886,6 +1915,11 @@ int ext4_insert_dentry(struct inode *dir,
 460         ext4_set_de_type(inode->i_sb, de, inode->i_mode);
 461         de->name_len = fname_len(fname);
 462         memcpy(de->name, fname_name(fname), fname_len(fname));
 463 +       if (data) {
 464 +               de->name[fname_len(fname)] = 0;
 465 +               memcpy(&de->name[fname_len(fname) + 1], data, *(char *)data);
 466 +               de->file_type |= EXT4_DIRENT_LUFID;
 467 +       }
 468         return 0;
 469  }
 470
 471 @@ -1900,18 +1934,23 @@ int ext4_insert_dentry(struct inode *dir,
 472  static int add_dirent_to_buf(handle_t *handle, struct ext4_filename *fname,
 473                              struct inode *dir,
 474                              struct inode *inode, struct ext4_dir_entry_2 *de,
 475 -                            struct buffer_head *bh)
 476 +                            struct buffer_head *bh, struct dentry *dentry)
 477  {
 478         unsigned int    blocksize = dir->i_sb->s_blocksize;
 479         int             csum_size = 0;
 480 -       int             err;
 481 +       int             err, dlen = 0;
 482 +       unsigned char   *data;
 483
 484 +       data = ext4_dentry_get_data(inode->i_sb, (struct ext4_dentry_param *)
 485 +                                               dentry->d_fsdata);
 486         if (ext4_has_metadata_csum(inode->i_sb))
 487                 csum_size = sizeof(struct ext4_dir_entry_tail);
 488
 489         if (!de) {
 490 +               if (data)
 491 +                       dlen = (*data) + 1;
 492                 err = ext4_find_dest_de(dir, inode, bh, bh->b_data,
 493 -                                       blocksize - csum_size, fname, &de);
 494 +                                       blocksize - csum_size, fname, &de, &dlen);
 495                 if (err)
 496                         return err;
 497         }
 498 @@ -1924,7 +1963,10 @@ static int add_dirent_to_buf(handle_t *handle, struct ext4_filename *fname,
 499
 500         /* By now the buffer is marked for journaling. Due to crypto operations,
 501          * the following function call may fail */
 502 -       err = ext4_insert_dentry(dir, inode, de, blocksize, fname);
 503 +       /* If writing the short form of "dotdot", don't add the data section */
 504 +       if (dlen == 1)
 505 +               data = NULL;
 506 +       err = ext4_insert_dentry(dir, inode, de, blocksize, fname, data);
 507         if (err < 0)
 508                 return err;
 509
 510 @@ -2036,7 +2078,8 @@ static int make_indexed_dir(handle_t *handle, struct ext4_filename *fname,
 511
 512         dx_set_block(entries, 1);
 513         dx_set_count(entries, 1);
 514 -       dx_set_limit(entries, dx_root_limit(dir, sizeof(*dx_info)));
 515 +       dx_set_limit(entries, dx_root_limit(dir,
 516 +                                        dot_de, sizeof(*dx_info)));
 517
 518         /* Initialize as for dx_probe */
 519         fname->hinfo.hash_version = dx_info->hash_version;
 520 @@ -2066,7 +2109,7 @@ static int make_indexed_dir(handle_t *handle, struct ext4_filename *fname,
 521         }
 522         dx_release(frames);
 523
 524 -       retval = add_dirent_to_buf(handle, fname, dir, inode, de, bh);
 525 +       retval = add_dirent_to_buf(handle, fname, dir, inode, de, bh, dentry);
 526         brelse(bh);
 527         return retval;
 528  out_frames:
 529 @@ -2088,6 +2131,8 @@ static int ext4_update_dotdot(handle_t *handle, struct dentry *dentry,
 530         struct buffer_head *dir_block;
 531         struct ext4_dir_entry_2 *de;
 532         int len, journal = 0, err = 0;
 533 +       int dlen = 0;
 534 +       char *data;
 535
 536         if (IS_ERR(handle))
 537                 return PTR_ERR(handle);
 538 @@ -2105,19 +2150,24 @@ static int ext4_update_dotdot(handle_t *handle, struct dentry *dentry,
 539         /* the first item must be "." */
 540         assert(de->name_len == 1 && de->name[0] == '.');
 541         len = le16_to_cpu(de->rec_len);
 542 -       assert(len >= EXT4_DIR_REC_LEN(1));
 543 -       if (len > EXT4_DIR_REC_LEN(1)) {
 544 +       assert(len >= __EXT4_DIR_REC_LEN(1));
 545 +       if (len > __EXT4_DIR_REC_LEN(1)) {
 546                 BUFFER_TRACE(dir_block, "get_write_access");
 547                 err = ext4_journal_get_write_access(handle, dir_block);
 548                 if (err)
 549                         goto out_journal;
 550
 551                 journal = 1;
 552 -               de->rec_len = cpu_to_le16(EXT4_DIR_REC_LEN(1));
 553 +               de->rec_len = cpu_to_le16(EXT4_DIR_REC_LEN(de));
 554         }
 555
 556 -       len -= EXT4_DIR_REC_LEN(1);
 557 -       assert(len == 0 || len >= EXT4_DIR_REC_LEN(2));
 558 +       len -= EXT4_DIR_REC_LEN(de);
 559 +       data = ext4_dentry_get_data(dir->i_sb,
 560 +                       (struct ext4_dentry_param *)dentry->d_fsdata);
 561 +       if (data)
 562 +               dlen = *data + 1;
 563 +       assert(len == 0 || len >= __EXT4_DIR_REC_LEN(2 + dlen));
 564 +
 565         de = (struct ext4_dir_entry_2 *)
 566                         ((char *) de + le16_to_cpu(de->rec_len));
 567         if (!journal) {
 568 @@ -2131,10 +2181,15 @@ static int ext4_update_dotdot(handle_t *handle, struct dentry *dentry,
 569         if (len > 0)
 570                 de->rec_len = cpu_to_le16(len);
 571         else
 572 -               assert(le16_to_cpu(de->rec_len) >= EXT4_DIR_REC_LEN(2));
 573 +               assert(le16_to_cpu(de->rec_len) >= __EXT4_DIR_REC_LEN(2));
 574         de->name_len = 2;
 575         strcpy(de->name, "..");
 576 -       ext4_set_de_type(dir->i_sb, de, S_IFDIR);
 577 +       if (data != NULL && ext4_get_dirent_data_len(de) >= dlen) {
 578 +               de->name[2] = 0;
 579 +               memcpy(&de->name[2 + 1], data, *data);
 580 +               ext4_set_de_type(dir->i_sb, de, S_IFDIR);
 581 +               de->file_type |= EXT4_DIRENT_LUFID;
 582 +       }
 583
 584  out_journal:
 585         if (journal) {
 586 @@ -2216,7 +2271,7 @@ static int ext4_add_entry(handle_t *handle, struct dentry *dentry,
 587                         goto out;
 588                 }
 589                 retval = add_dirent_to_buf(handle, &fname, dir, inode,
 590 -                                          NULL, bh);
 591 +                                          NULL, bh, dentry);
 592                 if (retval != -ENOSPC)
 593                         goto out;
 594
 595 @@ -2244,7 +2299,7 @@ static int ext4_add_entry(handle_t *handle, struct dentry *dentry,
 596                 initialize_dirent_tail(t, blocksize);
 597         }
 598
 599 -       retval = add_dirent_to_buf(handle, &fname, dir, inode, de, bh);
 600 +       retval = add_dirent_to_buf(handle, &fname, dir, inode, de, bh, dentry);
 601  out:
 602         ext4_fname_free_filename(&fname);
 603         brelse(bh);
 604 @@ -2284,7 +2339,7 @@ static int ext4_dx_add_entry(handle_t *handle, struct ext4_filename *fname,
 605         if (err)
 606                 goto journal_error;
 607
 608 -       err = add_dirent_to_buf(handle, fname, dir, inode, NULL, bh);
 609 +       err = add_dirent_to_buf(handle, fname, dir, inode, NULL, bh, dentry);
 610         if (err != -ENOSPC)
 611                 goto cleanup;
 612
 613 @@ -2388,7 +2443,7 @@ static int ext4_dx_add_entry(handle_t *handle, struct ext4_filename *fname,
 614                 err = PTR_ERR(de);
 615                 goto cleanup;
 616         }
 617 -       err = add_dirent_to_buf(handle, fname, dir, inode, de, bh);
 618 +       err = add_dirent_to_buf(handle, fname, dir, inode, de, bh, dentry);
 619         goto cleanup;
 620
 621  journal_error:
 622 @@ -2663,37 +2718,70 @@ err_unlock_inode:
 623         return err;
 624  }
 625
 626 +struct tp_block {
 627 +       struct inode *inode;
 628 +       void *data1;
 629 +       void *data2;
 630 +};
 631 +
 632  struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
 633                           struct ext4_dir_entry_2 *de,
 634                           int blocksize, int csum_size,
 635                           unsigned int parent_ino, int dotdot_real_len)
 636  {
 637 +       void *data1 = NULL, *data2 = NULL;
 638 +       int dot_reclen = 0;
 639 +
 640 +       if (dotdot_real_len == 10) {
 641 +               struct tp_block *tpb = (struct tp_block *)inode;
 642 +               data1 = tpb->data1;
 643 +               data2 = tpb->data2;
 644 +               inode = tpb->inode;
 645 +               dotdot_real_len = 0;
 646 +       }
 647         de->inode = cpu_to_le32(inode->i_ino);
 648         de->name_len = 1;
 649 -       de->rec_len = ext4_rec_len_to_disk(EXT4_DIR_REC_LEN(de->name_len),
 650 -                                          blocksize);
 651         strcpy(de->name, ".");
 652         ext4_set_de_type(inode->i_sb, de, S_IFDIR);
 653
 654 +       /* get packed fid data*/
 655 +       data1 = ext4_dentry_get_data(inode->i_sb,
 656 +                               (struct ext4_dentry_param *) data1);
 657 +       if (data1) {
 658 +               de->name[1] = 0;
 659 +               memcpy(&de->name[2], data1, *(char *) data1);
 660 +               de->file_type |= EXT4_DIRENT_LUFID;
 661 +       }
 662 +       de->rec_len = cpu_to_le16(EXT4_DIR_REC_LEN(de));
 663 +       dot_reclen = cpu_to_le16(de->rec_len);
 664         de = ext4_next_entry(de, blocksize);
 665         de->inode = cpu_to_le32(parent_ino);
 666         de->name_len = 2;
 667 +       strcpy(de->name, "..");
 668 +       ext4_set_de_type(inode->i_sb, de, S_IFDIR);
 669 +       data2 = ext4_dentry_get_data(inode->i_sb,
 670 +                       (struct ext4_dentry_param *) data2);
 671 +       if (data2) {
 672 +               de->name[2] = 0;
 673 +               memcpy(&de->name[3], data2, *(char *) data2);
 674 +               de->file_type |= EXT4_DIRENT_LUFID;
 675 +       }
 676         if (!dotdot_real_len)
 677                 de->rec_len = ext4_rec_len_to_disk(blocksize -
 678 -                                       (csum_size + EXT4_DIR_REC_LEN(1)),
 679 +                                       (csum_size + dot_reclen),
 680                                         blocksize);
 681         else
 682                 de->rec_len = ext4_rec_len_to_disk(
 683 -                               EXT4_DIR_REC_LEN(de->name_len), blocksize);
 684 -       strcpy(de->name, "..");
 685 -       ext4_set_de_type(inode->i_sb, de, S_IFDIR);
 686 +                               EXT4_DIR_REC_LEN(de), blocksize);
 687
 688         return ext4_next_entry(de, blocksize);
 689  }
 690
 691  static int ext4_init_new_dir(handle_t *handle, struct inode *dir,
 692 -                            struct inode *inode)
 693 +                            struct inode *inode,
 694 +                            const void *data1, const void *data2)
 695  {
 696 +       struct tp_block param;
 697         struct buffer_head *dir_block = NULL;
 698         struct ext4_dir_entry_2 *de;
 699         struct ext4_dir_entry_tail *t;
 700 @@ -2718,7 +2806,11 @@ static int ext4_init_new_dir(handle_t *handle, struct inode *dir,
 701         if (IS_ERR(dir_block))
 702                 return PTR_ERR(dir_block);
 703         de = (struct ext4_dir_entry_2 *)dir_block->b_data;
 704 -       ext4_init_dot_dotdot(inode, de, blocksize, csum_size, dir->i_ino, 0);
 705 +       param.inode = inode;
 706 +       param.data1 = (void *)data1;
 707 +       param.data2 = (void *)data2;
 708 +       ext4_init_dot_dotdot((struct inode *)(&param), de, blocksize,
 709 +                            csum_size, dir->i_ino, 10);
 710         set_nlink(inode, 2);
 711         if (csum_size) {
 712                 t = EXT4_DIRENT_TAIL(dir_block->b_data, blocksize);
 713 @@ -2735,6 +2827,29 @@ out:
 714         return err;
 715  }
 716
 717 +/* Initialize @inode as a subdirectory of @dir, and add the
 718 + * "." and ".." entries into the first directory block. */
 719 +int ext4_add_dot_dotdot(handle_t *handle, struct inode *dir,
 720 +                       struct inode *inode,
 721 +                       const void *data1, const void *data2)
 722 +{
 723 +       int rc;
 724 +
 725 +       if (IS_ERR(handle))
 726 +               return PTR_ERR(handle);
 727 +
 728 +       if (IS_DIRSYNC(dir))
 729 +               ext4_handle_sync(handle);
 730 +
 731 +       inode->i_op = &ext4_dir_inode_operations;
 732 +       inode->i_fop = &ext4_dir_operations;
 733 +       rc = ext4_init_new_dir(handle, dir, inode, data1, data2);
 734 +       if (!rc)
 735 +               rc = ext4_mark_inode_dirty(handle, inode);
 736 +       return rc;
 737 +}
 738 +EXPORT_SYMBOL(ext4_add_dot_dotdot);
 739 +
 740  static int ext4_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 741  {
 742         handle_t *handle;
 743 @@ -2761,7 +2876,7 @@ retry:
 744
 745         inode->i_op = &ext4_dir_inode_operations;
 746         inode->i_fop = &ext4_dir_operations;
 747 -       err = ext4_init_new_dir(handle, dir, inode);
 748 +       err = ext4_init_new_dir(handle, dir, inode, NULL, NULL);
 749         if (err)
 750                 goto out_clear_inode;
 751         err = ext4_mark_inode_dirty(handle, inode);
 752 @@ -2813,7 +2928,7 @@ int ext4_empty_dir(struct inode *inode)
 753         }
 754
 755         sb = inode->i_sb;
 756 -       if (inode->i_size < EXT4_DIR_REC_LEN(1) + EXT4_DIR_REC_LEN(2)) {
 757 +       if (inode->i_size < __EXT4_DIR_REC_LEN(1) + __EXT4_DIR_REC_LEN(2)) {
 758                 EXT4_ERROR_INODE(inode, "invalid size");
 759                 return 1;
 760         }
 761 diff --git a/fs/ext4/super.c b/fs/ext4/super.c
 762 index 7715539..f48b36e 100644
 763 --- a/fs/ext4/super.c
 764 +++ b/fs/ext4/super.c
 765 @@ -1159,7 +1159,7 @@ enum {
 766         Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
 767         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
 768         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
 769 -       Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
 770 +       Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err, Opt_dirdata,
 771         Opt_usrquota, Opt_grpquota, Opt_i_version, Opt_dax,
 772         Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
 773         Opt_lazytime, Opt_nolazytime,
 774 @@ -1230,6 +1230,7 @@ static const match_table_t tokens = {
 775         {Opt_lazytime, "lazytime"},
 776         {Opt_nolazytime, "nolazytime"},
 777         {Opt_nodelalloc, "nodelalloc"},
 778 +       {Opt_dirdata, "dirdata"},
 779         {Opt_removed, "mblk_io_submit"},
 780         {Opt_removed, "nomblk_io_submit"},
 781         {Opt_block_validity, "block_validity"},
 782 @@ -1444,6 +1445,7 @@ static const struct mount_opts {
 783         {Opt_usrjquota, 0, MOPT_Q},
 784         {Opt_grpjquota, 0, MOPT_Q},
 785         {Opt_offusrjquota, 0, MOPT_Q},
 786 +       {Opt_dirdata, EXT4_MOUNT_DIRDATA, MOPT_SET},
 787         {Opt_offgrpjquota, 0, MOPT_Q},
 788         {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
 789         {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},