fs/ext4/inline.c

   1 /*
   2  * Copyright (c) 2012 Taobao.
   3  * Written by Tao Ma <boyu.mt@taobao.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2.1 of the GNU Lesser General Public License
   7  * as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <linux/fiemap.h>
  16
  17 #include "ext4_jbd2.h"
  18 #include "ext4.h"
  19 #include "xattr.h"
  20 #include "truncate.h"
  21
  22 #define EXT4_XATTR_SYSTEM_DATA  "data"
  23 #define EXT4_MIN_INLINE_DATA_SIZE       ((sizeof(__le32) * EXT4_N_BLOCKS))
  24 #define EXT4_INLINE_DOTDOT_OFFSET       2
  25 #define EXT4_INLINE_DOTDOT_SIZE         4
  26
  27 static int ext4_get_inline_size(struct inode *inode)
  28 {
  29         if (EXT4_I(inode)->i_inline_off)
  30                 return EXT4_I(inode)->i_inline_size;
  31
  32         return 0;
  33 }
  34
  35 static int get_max_inline_xattr_value_size(struct inode *inode,
  36                                            struct ext4_iloc *iloc)
  37 {
  38         struct ext4_xattr_ibody_header *header;
  39         struct ext4_xattr_entry *entry;
  40         struct ext4_inode *raw_inode;
  41         void *end;
  42         int free, min_offs;
  43
  44         if (!EXT4_INODE_HAS_XATTR_SPACE(inode))
  45                 return 0;
  46
  47         min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
  48                         EXT4_GOOD_OLD_INODE_SIZE -
  49                         EXT4_I(inode)->i_extra_isize -
  50                         sizeof(struct ext4_xattr_ibody_header);
  51
  52         /*
  53          * We need to subtract another sizeof(__u32) since an in-inode xattr
  54          * needs an empty 4 bytes to indicate the gap between the xattr entry
  55          * and the name/value pair.
  56          */
  57         if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
  58                 return EXT4_XATTR_SIZE(min_offs -
  59                         EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
  60                         EXT4_XATTR_ROUND - sizeof(__u32));
  61
  62         raw_inode = ext4_raw_inode(iloc);
  63         header = IHDR(inode, raw_inode);
  64         entry = IFIRST(header);
  65         end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size;
  66
  67         /* Compute min_offs. */
  68         while (!IS_LAST_ENTRY(entry)) {
  69                 void *next = EXT4_XATTR_NEXT(entry);
  70
  71                 if (next >= end) {
  72                         EXT4_ERROR_INODE(inode,
  73                                          "corrupt xattr in inline inode");
  74                         return 0;
  75                 }
  76                 if (!entry->e_value_inum && entry->e_value_size) {
  77                         size_t offs = le16_to_cpu(entry->e_value_offs);
  78                         if (offs < min_offs)
  79                                 min_offs = offs;
  80                 }
  81                 entry = next;
  82         }
  83         free = min_offs -
  84                 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
  85
  86         if (EXT4_I(inode)->i_inline_off) {
  87                 entry = (struct ext4_xattr_entry *)
  88                         ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
  89
  90                 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
  91                 goto out;
  92         }
  93
  94         free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
  95
  96         if (free > EXT4_XATTR_ROUND)
  97                 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
  98         else
  99                 free = 0;
 100
 101 out:
 102         return free;
 103 }
 104
 105 /*
 106  * Get the maximum size we now can store in an inode.
 107  * If we can't find the space for a xattr entry, don't use the space
 108  * of the extents since we have no space to indicate the inline data.
 109  */
 110 int ext4_get_max_inline_size(struct inode *inode)
 111 {
 112         int error, max_inline_size;
 113         struct ext4_iloc iloc;
 114
 115         if (EXT4_I(inode)->i_extra_isize == 0)
 116                 return 0;
 117
 118         error = ext4_get_inode_loc(inode, &iloc);
 119         if (error) {
 120                 ext4_error_inode(inode, __func__, __LINE__, 0,
 121                                  "can't get inode location %lu",
 122                                  inode->i_ino);
 123                 return 0;
 124         }
 125
 126         down_read(&EXT4_I(inode)->xattr_sem);
 127         max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
 128         up_read(&EXT4_I(inode)->xattr_sem);
 129
 130         brelse(iloc.bh);
 131
 132         if (!max_inline_size)
 133                 return 0;
 134
 135         return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
 136 }
 137
 138 /*
 139  * this function does not take xattr_sem, which is OK because it is
 140  * currently only used in a code path coming form ext4_iget, before
 141  * the new inode has been unlocked
 142  */
 143 int ext4_find_inline_data_nolock(struct inode *inode)
 144 {
 145         struct ext4_xattr_ibody_find is = {
 146                 .s = { .not_found = -ENODATA, },
 147         };
 148         struct ext4_xattr_info i = {
 149                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 150                 .name = EXT4_XATTR_SYSTEM_DATA,
 151         };
 152         int error;
 153
 154         if (EXT4_I(inode)->i_extra_isize == 0)
 155                 return 0;
 156
 157         error = ext4_get_inode_loc(inode, &is.iloc);
 158         if (error)
 159                 return error;
 160
 161         error = ext4_xattr_ibody_find(inode, &i, &is);
 162         if (error)
 163                 goto out;
 164
 165         if (!is.s.not_found) {
 166                 if (is.s.here->e_value_inum) {
 167                         EXT4_ERROR_INODE(inode, "inline data xattr refers "
 168                                          "to an external xattr inode");
 169                         error = -EFSCORRUPTED;
 170                         goto out;
 171                 }
 172                 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 173                                         (void *)ext4_raw_inode(&is.iloc));
 174                 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 175                                 le32_to_cpu(is.s.here->e_value_size);
 176         }
 177 out:
 178         brelse(is.iloc.bh);
 179         return error;
 180 }
 181
 182 static int ext4_read_inline_data(struct inode *inode, void *buffer,
 183                                  unsigned int len,
 184                                  struct ext4_iloc *iloc)
 185 {
 186         struct ext4_xattr_entry *entry;
 187         struct ext4_xattr_ibody_header *header;
 188         int cp_len = 0;
 189         struct ext4_inode *raw_inode;
 190
 191         if (!len)
 192                 return 0;
 193
 194         BUG_ON(len > EXT4_I(inode)->i_inline_size);
 195
 196         cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
 197                         len : EXT4_MIN_INLINE_DATA_SIZE;
 198
 199         raw_inode = ext4_raw_inode(iloc);
 200         memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
 201
 202         len -= cp_len;
 203         buffer += cp_len;
 204
 205         if (!len)
 206                 goto out;
 207
 208         header = IHDR(inode, raw_inode);
 209         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 210                                             EXT4_I(inode)->i_inline_off);
 211         len = min_t(unsigned int, len,
 212                     (unsigned int)le32_to_cpu(entry->e_value_size));
 213
 214         memcpy(buffer,
 215                (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
 216         cp_len += len;
 217
 218 out:
 219         return cp_len;
 220 }
 221
 222 /*
 223  * write the buffer to the inline inode.
 224  * If 'create' is set, we don't need to do the extra copy in the xattr
 225  * value since it is already handled by ext4_xattr_ibody_set.
 226  * That saves us one memcpy.
 227  */
 228 static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
 229                                    void *buffer, loff_t pos, unsigned int len)
 230 {
 231         struct ext4_xattr_entry *entry;
 232         struct ext4_xattr_ibody_header *header;
 233         struct ext4_inode *raw_inode;
 234         int cp_len = 0;
 235
 236         if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
 237                 return;
 238
 239         BUG_ON(!EXT4_I(inode)->i_inline_off);
 240         BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
 241
 242         raw_inode = ext4_raw_inode(iloc);
 243         buffer += pos;
 244
 245         if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
 246                 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
 247                          EXT4_MIN_INLINE_DATA_SIZE - pos : len;
 248                 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
 249
 250                 len -= cp_len;
 251                 buffer += cp_len;
 252                 pos += cp_len;
 253         }
 254
 255         if (!len)
 256                 return;
 257
 258         pos -= EXT4_MIN_INLINE_DATA_SIZE;
 259         header = IHDR(inode, raw_inode);
 260         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 261                                             EXT4_I(inode)->i_inline_off);
 262
 263         memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
 264                buffer, len);
 265 }
 266
 267 static int ext4_create_inline_data(handle_t *handle,
 268                                    struct inode *inode, unsigned len)
 269 {
 270         int error;
 271         void *value = NULL;
 272         struct ext4_xattr_ibody_find is = {
 273                 .s = { .not_found = -ENODATA, },
 274         };
 275         struct ext4_xattr_info i = {
 276                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 277                 .name = EXT4_XATTR_SYSTEM_DATA,
 278         };
 279
 280         error = ext4_get_inode_loc(inode, &is.iloc);
 281         if (error)
 282                 return error;
 283
 284         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 285         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 286         if (error)
 287                 goto out;
 288
 289         if (len > EXT4_MIN_INLINE_DATA_SIZE) {
 290                 value = EXT4_ZERO_XATTR_VALUE;
 291                 len -= EXT4_MIN_INLINE_DATA_SIZE;
 292         } else {
 293                 value = "";
 294                 len = 0;
 295         }
 296
 297         /* Insert the the xttr entry. */
 298         i.value = value;
 299         i.value_len = len;
 300
 301         error = ext4_xattr_ibody_find(inode, &i, &is);
 302         if (error)
 303                 goto out;
 304
 305         BUG_ON(!is.s.not_found);
 306
 307         error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 308         if (error) {
 309                 if (error == -ENOSPC)
 310                         ext4_clear_inode_state(inode,
 311                                                EXT4_STATE_MAY_INLINE_DATA);
 312                 goto out;
 313         }
 314
 315         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 316                 0, EXT4_MIN_INLINE_DATA_SIZE);
 317
 318         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 319                                       (void *)ext4_raw_inode(&is.iloc));
 320         EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
 321         ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
 322         ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 323         get_bh(is.iloc.bh);
 324         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 325
 326 out:
 327         brelse(is.iloc.bh);
 328         return error;
 329 }
 330
 331 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
 332                                    unsigned int len)
 333 {
 334         int error;
 335         void *value = NULL;
 336         struct ext4_xattr_ibody_find is = {
 337                 .s = { .not_found = -ENODATA, },
 338         };
 339         struct ext4_xattr_info i = {
 340                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 341                 .name = EXT4_XATTR_SYSTEM_DATA,
 342         };
 343
 344         /* If the old space is ok, write the data directly. */
 345         if (len <= EXT4_I(inode)->i_inline_size)
 346                 return 0;
 347
 348         error = ext4_get_inode_loc(inode, &is.iloc);
 349         if (error)
 350                 return error;
 351
 352         error = ext4_xattr_ibody_find(inode, &i, &is);
 353         if (error)
 354                 goto out;
 355
 356         BUG_ON(is.s.not_found);
 357
 358         len -= EXT4_MIN_INLINE_DATA_SIZE;
 359         value = kzalloc(len, GFP_NOFS);
 360         if (!value) {
 361                 error = -ENOMEM;
 362                 goto out;
 363         }
 364
 365         error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
 366                                      value, len);
 367         if (error < 0)
 368                 goto out;
 369
 370         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 371         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 372         if (error)
 373                 goto out;
 374
 375         /* Update the xttr entry. */
 376         i.value = value;
 377         i.value_len = len;
 378
 379         error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 380         if (error)
 381                 goto out;
 382
 383         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 384                                       (void *)ext4_raw_inode(&is.iloc));
 385         EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 386                                 le32_to_cpu(is.s.here->e_value_size);
 387         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 388         get_bh(is.iloc.bh);
 389         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 390
 391 out:
 392         kfree(value);
 393         brelse(is.iloc.bh);
 394         return error;
 395 }
 396
 397 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
 398                                     unsigned int len)
 399 {
 400         int ret, size, no_expand;
 401         struct ext4_inode_info *ei = EXT4_I(inode);
 402
 403         if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
 404                 return -ENOSPC;
 405
 406         size = ext4_get_max_inline_size(inode);
 407         if (size < len)
 408                 return -ENOSPC;
 409
 410         ext4_write_lock_xattr(inode, &no_expand);
 411
 412         if (ei->i_inline_off)
 413                 ret = ext4_update_inline_data(handle, inode, len);
 414         else
 415                 ret = ext4_create_inline_data(handle, inode, len);
 416
 417         ext4_write_unlock_xattr(inode, &no_expand);
 418         return ret;
 419 }
 420
 421 static int ext4_destroy_inline_data_nolock(handle_t *handle,
 422                                            struct inode *inode)
 423 {
 424         struct ext4_inode_info *ei = EXT4_I(inode);
 425         struct ext4_xattr_ibody_find is = {
 426                 .s = { .not_found = 0, },
 427         };
 428         struct ext4_xattr_info i = {
 429                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 430                 .name = EXT4_XATTR_SYSTEM_DATA,
 431                 .value = NULL,
 432                 .value_len = 0,
 433         };
 434         int error;
 435
 436         if (!ei->i_inline_off)
 437                 return 0;
 438
 439         error = ext4_get_inode_loc(inode, &is.iloc);
 440         if (error)
 441                 return error;
 442
 443         error = ext4_xattr_ibody_find(inode, &i, &is);
 444         if (error)
 445                 goto out;
 446
 447         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 448         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 449         if (error)
 450                 goto out;
 451
 452         error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 453         if (error)
 454                 goto out;
 455
 456         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 457                 0, EXT4_MIN_INLINE_DATA_SIZE);
 458         memset(ei->i_data, 0, EXT4_MIN_INLINE_DATA_SIZE);
 459
 460         if (ext4_has_feature_extents(inode->i_sb)) {
 461                 if (S_ISDIR(inode->i_mode) ||
 462                     S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
 463                         ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
 464                         ext4_ext_tree_init(handle, inode);
 465                 }
 466         }
 467         ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 468
 469         get_bh(is.iloc.bh);
 470         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 471
 472         EXT4_I(inode)->i_inline_off = 0;
 473         EXT4_I(inode)->i_inline_size = 0;
 474         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 475 out:
 476         brelse(is.iloc.bh);
 477         if (error == -ENODATA)
 478                 error = 0;
 479         return error;
 480 }
 481
 482 static int ext4_read_inline_page(struct inode *inode, struct page *page)
 483 {
 484         void *kaddr;
 485         int ret = 0;
 486         size_t len;
 487         struct ext4_iloc iloc;
 488
 489         BUG_ON(!PageLocked(page));
 490         BUG_ON(!ext4_has_inline_data(inode));
 491         BUG_ON(page->index);
 492
 493         if (!EXT4_I(inode)->i_inline_off) {
 494                 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
 495                              inode->i_ino);
 496                 goto out;
 497         }
 498
 499         ret = ext4_get_inode_loc(inode, &iloc);
 500         if (ret)
 501                 goto out;
 502
 503         len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
 504         kaddr = kmap_atomic(page);
 505         ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
 506         flush_dcache_page(page);
 507         kunmap_atomic(kaddr);
 508         zero_user_segment(page, len, PAGE_SIZE);
 509         SetPageUptodate(page);
 510         brelse(iloc.bh);
 511
 512 out:
 513         return ret;
 514 }
 515
 516 int ext4_readpage_inline(struct inode *inode, struct page *page)
 517 {
 518         int ret = 0;
 519
 520         down_read(&EXT4_I(inode)->xattr_sem);
 521         if (!ext4_has_inline_data(inode)) {
 522                 up_read(&EXT4_I(inode)->xattr_sem);
 523                 return -EAGAIN;
 524         }
 525
 526         /*
 527          * Current inline data can only exist in the 1st page,
 528          * So for all the other pages, just set them uptodate.
 529          */
 530         if (!page->index)
 531                 ret = ext4_read_inline_page(inode, page);
 532         else if (!PageUptodate(page)) {
 533                 zero_user_segment(page, 0, PAGE_SIZE);
 534                 SetPageUptodate(page);
 535         }
 536
 537         up_read(&EXT4_I(inode)->xattr_sem);
 538
 539         unlock_page(page);
 540         return ret >= 0 ? 0 : ret;
 541 }
 542
 543 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
 544                                               struct inode *inode,
 545                                               unsigned flags)
 546 {
 547         int ret, needed_blocks, no_expand;
 548         handle_t *handle = NULL;
 549         int retries = 0, sem_held = 0;
 550         struct page *page = NULL;
 551         unsigned from, to;
 552         struct ext4_iloc iloc;
 553
 554         if (!ext4_has_inline_data(inode)) {
 555                 /*
 556                  * clear the flag so that no new write
 557                  * will trap here again.
 558                  */
 559                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 560                 return 0;
 561         }
 562
 563         needed_blocks = ext4_writepage_trans_blocks(inode);
 564
 565         ret = ext4_get_inode_loc(inode, &iloc);
 566         if (ret)
 567                 return ret;
 568
 569 retry:
 570         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
 571         if (IS_ERR(handle)) {
 572                 ret = PTR_ERR(handle);
 573                 handle = NULL;
 574                 goto out;
 575         }
 576
 577         /* We cannot recurse into the filesystem as the transaction is already
 578          * started */
 579         flags |= AOP_FLAG_NOFS;
 580
 581         page = grab_cache_page_write_begin(mapping, 0, flags);
 582         if (!page) {
 583                 ret = -ENOMEM;
 584                 goto out;
 585         }
 586
 587         ext4_write_lock_xattr(inode, &no_expand);
 588         sem_held = 1;
 589         /* If some one has already done this for us, just exit. */
 590         if (!ext4_has_inline_data(inode)) {
 591                 ret = 0;
 592                 goto out;
 593         }
 594
 595         from = 0;
 596         to = ext4_get_inline_size(inode);
 597         if (!PageUptodate(page)) {
 598                 ret = ext4_read_inline_page(inode, page);
 599                 if (ret < 0)
 600                         goto out;
 601         }
 602
 603         ret = ext4_destroy_inline_data_nolock(handle, inode);
 604         if (ret)
 605                 goto out;
 606
 607         if (ext4_should_dioread_nolock(inode)) {
 608                 ret = __block_write_begin(page, from, to,
 609                                           ext4_get_block_unwritten);
 610         } else
 611                 ret = __block_write_begin(page, from, to, ext4_get_block);
 612
 613         if (!ret && ext4_should_journal_data(inode)) {
 614                 ret = ext4_walk_page_buffers(handle, page_buffers(page),
 615                                              from, to, NULL,
 616                                              do_journal_get_write_access);
 617         }
 618
 619         if (ret) {
 620                 unlock_page(page);
 621                 put_page(page);
 622                 page = NULL;
 623                 ext4_orphan_add(handle, inode);
 624                 ext4_write_unlock_xattr(inode, &no_expand);
 625                 sem_held = 0;
 626                 ext4_journal_stop(handle);
 627                 handle = NULL;
 628                 ext4_truncate_failed_write(inode);
 629                 /*
 630                  * If truncate failed early the inode might
 631                  * still be on the orphan list; we need to
 632                  * make sure the inode is removed from the
 633                  * orphan list in that case.
 634                  */
 635                 if (inode->i_nlink)
 636                         ext4_orphan_del(NULL, inode);
 637         }
 638
 639         if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 640                 goto retry;
 641
 642         if (page)
 643                 block_commit_write(page, from, to);
 644 out:
 645         if (page) {
 646                 unlock_page(page);
 647                 put_page(page);
 648         }
 649         if (sem_held)
 650                 ext4_write_unlock_xattr(inode, &no_expand);
 651         if (handle)
 652                 ext4_journal_stop(handle);
 653         brelse(iloc.bh);
 654         return ret;
 655 }
 656
 657 /*
 658  * Try to write data in the inode.
 659  * If the inode has inline data, check whether the new write can be
 660  * in the inode also. If not, create the page the handle, move the data
 661  * to the page make it update and let the later codes create extent for it.
 662  */
 663 int ext4_try_to_write_inline_data(struct address_space *mapping,
 664                                   struct inode *inode,
 665                                   loff_t pos, unsigned len,
 666                                   unsigned flags,
 667                                   struct page **pagep)
 668 {
 669         int ret;
 670         handle_t *handle;
 671         struct page *page;
 672         struct ext4_iloc iloc;
 673
 674         if (pos + len > ext4_get_max_inline_size(inode))
 675                 goto convert;
 676
 677         ret = ext4_get_inode_loc(inode, &iloc);
 678         if (ret)
 679                 return ret;
 680
 681         /*
 682          * The possible write could happen in the inode,
 683          * so try to reserve the space in inode first.
 684          */
 685         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 686         if (IS_ERR(handle)) {
 687                 ret = PTR_ERR(handle);
 688                 handle = NULL;
 689                 goto out;
 690         }
 691
 692         ret = ext4_prepare_inline_data(handle, inode, pos + len);
 693         if (ret && ret != -ENOSPC)
 694                 goto out;
 695
 696         /* We don't have space in inline inode, so convert it to extent. */
 697         if (ret == -ENOSPC) {
 698                 ext4_journal_stop(handle);
 699                 brelse(iloc.bh);
 700                 goto convert;
 701         }
 702
 703         ret = ext4_journal_get_write_access(handle, iloc.bh);
 704         if (ret)
 705                 goto out;
 706
 707         flags |= AOP_FLAG_NOFS;
 708
 709         page = grab_cache_page_write_begin(mapping, 0, flags);
 710         if (!page) {
 711                 ret = -ENOMEM;
 712                 goto out;
 713         }
 714
 715         *pagep = page;
 716         down_read(&EXT4_I(inode)->xattr_sem);
 717         if (!ext4_has_inline_data(inode)) {
 718                 ret = 0;
 719                 unlock_page(page);
 720                 put_page(page);
 721                 goto out_up_read;
 722         }
 723
 724         if (!PageUptodate(page)) {
 725                 ret = ext4_read_inline_page(inode, page);
 726                 if (ret < 0) {
 727                         unlock_page(page);
 728                         put_page(page);
 729                         goto out_up_read;
 730                 }
 731         }
 732
 733         ret = 1;
 734         handle = NULL;
 735 out_up_read:
 736         up_read(&EXT4_I(inode)->xattr_sem);
 737 out:
 738         if (handle && (ret != 1))
 739                 ext4_journal_stop(handle);
 740         brelse(iloc.bh);
 741         return ret;
 742 convert:
 743         return ext4_convert_inline_data_to_extent(mapping,
 744                                                   inode, flags);
 745 }
 746
 747 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 748                                unsigned copied, struct page *page)
 749 {
 750         int ret, no_expand;
 751         void *kaddr;
 752         struct ext4_iloc iloc;
 753
 754         if (unlikely(copied < len)) {
 755                 if (!PageUptodate(page)) {
 756                         copied = 0;
 757                         goto out;
 758                 }
 759         }
 760
 761         ret = ext4_get_inode_loc(inode, &iloc);
 762         if (ret) {
 763                 ext4_std_error(inode->i_sb, ret);
 764                 copied = 0;
 765                 goto out;
 766         }
 767
 768         ext4_write_lock_xattr(inode, &no_expand);
 769         BUG_ON(!ext4_has_inline_data(inode));
 770
 771         /*
 772          * ei->i_inline_off may have changed since ext4_write_begin()
 773          * called ext4_try_to_write_inline_data()
 774          */
 775         (void) ext4_find_inline_data_nolock(inode);
 776
 777         kaddr = kmap_atomic(page);
 778         ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
 779         kunmap_atomic(kaddr);
 780         SetPageUptodate(page);
 781         /* clear page dirty so that writepages wouldn't work for us. */
 782         ClearPageDirty(page);
 783
 784         ext4_write_unlock_xattr(inode, &no_expand);
 785         brelse(iloc.bh);
 786         mark_inode_dirty(inode);
 787 out:
 788         return copied;
 789 }
 790
 791 struct buffer_head *
 792 ext4_journalled_write_inline_data(struct inode *inode,
 793                                   unsigned len,
 794                                   struct page *page)
 795 {
 796         int ret, no_expand;
 797         void *kaddr;
 798         struct ext4_iloc iloc;
 799
 800         ret = ext4_get_inode_loc(inode, &iloc);
 801         if (ret) {
 802                 ext4_std_error(inode->i_sb, ret);
 803                 return NULL;
 804         }
 805
 806         ext4_write_lock_xattr(inode, &no_expand);
 807         kaddr = kmap_atomic(page);
 808         ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
 809         kunmap_atomic(kaddr);
 810         ext4_write_unlock_xattr(inode, &no_expand);
 811
 812         return iloc.bh;
 813 }
 814
 815 /*
 816  * Try to make the page cache and handle ready for the inline data case.
 817  * We can call this function in 2 cases:
 818  * 1. The inode is created and the first write exceeds inline size. We can
 819  *    clear the inode state safely.
 820  * 2. The inode has inline data, then we need to read the data, make it
 821  *    update and dirty so that ext4_da_writepages can handle it. We don't
 822  *    need to start the journal since the file's metatdata isn't changed now.
 823  */
 824 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 825                                                  struct inode *inode,
 826                                                  unsigned flags,
 827                                                  void **fsdata)
 828 {
 829         int ret = 0, inline_size;
 830         struct page *page;
 831
 832         page = grab_cache_page_write_begin(mapping, 0, flags);
 833         if (!page)
 834                 return -ENOMEM;
 835
 836         down_read(&EXT4_I(inode)->xattr_sem);
 837         if (!ext4_has_inline_data(inode)) {
 838                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 839                 goto out;
 840         }
 841
 842         inline_size = ext4_get_inline_size(inode);
 843
 844         if (!PageUptodate(page)) {
 845                 ret = ext4_read_inline_page(inode, page);
 846                 if (ret < 0)
 847                         goto out;
 848         }
 849
 850         ret = __block_write_begin(page, 0, inline_size,
 851                                   ext4_da_get_block_prep);
 852         if (ret) {
 853                 up_read(&EXT4_I(inode)->xattr_sem);
 854                 unlock_page(page);
 855                 put_page(page);
 856                 ext4_truncate_failed_write(inode);
 857                 return ret;
 858         }
 859
 860         SetPageDirty(page);
 861         SetPageUptodate(page);
 862         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 863         *fsdata = (void *)CONVERT_INLINE_DATA;
 864
 865 out:
 866         up_read(&EXT4_I(inode)->xattr_sem);
 867         if (page) {
 868                 unlock_page(page);
 869                 put_page(page);
 870         }
 871         return ret;
 872 }
 873
 874 /*
 875  * Prepare the write for the inline data.
 876  * If the the data can be written into the inode, we just read
 877  * the page and make it uptodate, and start the journal.
 878  * Otherwise read the page, makes it dirty so that it can be
 879  * handle in writepages(the i_disksize update is left to the
 880  * normal ext4_da_write_end).
 881  */
 882 int ext4_da_write_inline_data_begin(struct address_space *mapping,
 883                                     struct inode *inode,
 884                                     loff_t pos, unsigned len,
 885                                     unsigned flags,
 886                                     struct page **pagep,
 887                                     void **fsdata)
 888 {
 889         int ret, inline_size;
 890         handle_t *handle;
 891         struct page *page;
 892         struct ext4_iloc iloc;
 893         int retries = 0;
 894
 895         ret = ext4_get_inode_loc(inode, &iloc);
 896         if (ret)
 897                 return ret;
 898
 899 retry_journal:
 900         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 901         if (IS_ERR(handle)) {
 902                 ret = PTR_ERR(handle);
 903                 goto out;
 904         }
 905
 906         inline_size = ext4_get_max_inline_size(inode);
 907
 908         ret = -ENOSPC;
 909         if (inline_size >= pos + len) {
 910                 ret = ext4_prepare_inline_data(handle, inode, pos + len);
 911                 if (ret && ret != -ENOSPC)
 912                         goto out_journal;
 913         }
 914
 915         /*
 916          * We cannot recurse into the filesystem as the transaction
 917          * is already started.
 918          */
 919         flags |= AOP_FLAG_NOFS;
 920
 921         if (ret == -ENOSPC) {
 922                 ext4_journal_stop(handle);
 923                 ret = ext4_da_convert_inline_data_to_extent(mapping,
 924                                                             inode,
 925                                                             flags,
 926                                                             fsdata);
 927                 if (ret == -ENOSPC &&
 928                     ext4_should_retry_alloc(inode->i_sb, &retries))
 929                         goto retry_journal;
 930                 goto out;
 931         }
 932
 933         page = grab_cache_page_write_begin(mapping, 0, flags);
 934         if (!page) {
 935                 ret = -ENOMEM;
 936                 goto out_journal;
 937         }
 938
 939         down_read(&EXT4_I(inode)->xattr_sem);
 940         if (!ext4_has_inline_data(inode)) {
 941                 ret = 0;
 942                 goto out_release_page;
 943         }
 944
 945         if (!PageUptodate(page)) {
 946                 ret = ext4_read_inline_page(inode, page);
 947                 if (ret < 0)
 948                         goto out_release_page;
 949         }
 950         ret = ext4_journal_get_write_access(handle, iloc.bh);
 951         if (ret)
 952                 goto out_release_page;
 953
 954         up_read(&EXT4_I(inode)->xattr_sem);
 955         *pagep = page;
 956         brelse(iloc.bh);
 957         return 1;
 958 out_release_page:
 959         up_read(&EXT4_I(inode)->xattr_sem);
 960         unlock_page(page);
 961         put_page(page);
 962 out_journal:
 963         ext4_journal_stop(handle);
 964 out:
 965         brelse(iloc.bh);
 966         return ret;
 967 }
 968
 969 int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
 970                                   unsigned len, unsigned copied,
 971                                   struct page *page)
 972 {
 973         int ret;
 974
 975         ret = ext4_write_inline_data_end(inode, pos, len, copied, page);
 976         if (ret < 0) {
 977                 unlock_page(page);
 978                 put_page(page);
 979                 return ret;
 980         }
 981         copied = ret;
 982
 983         /*
 984          * No need to use i_size_read() here, the i_size
 985          * cannot change under us because we hold i_mutex.
 986          *
 987          * But it's important to update i_size while still holding page lock:
 988          * page writeout could otherwise come in and zero beyond i_size.
 989          */
 990         if (pos+copied > inode->i_size)
 991                 i_size_write(inode, pos+copied);
 992         unlock_page(page);
 993         put_page(page);
 994
 995         /*
 996          * Don't mark the inode dirty under page lock. First, it unnecessarily
 997          * makes the holding time of page lock longer. Second, it forces lock
 998          * ordering of page lock and transaction start for journaling
 999          * filesystems.
1000          */
1001         mark_inode_dirty(inode);
1002
1003         return copied;
1004 }
1005
1006 #ifdef INLINE_DIR_DEBUG
1007 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
1008                           void *inline_start, int inline_size)
1009 {
1010         int offset;
1011         unsigned short de_len;
1012         struct ext4_dir_entry_2 *de = inline_start;
1013         void *dlimit = inline_start + inline_size;
1014
1015         trace_printk("inode %lu\n", dir->i_ino);
1016         offset = 0;
1017         while ((void *)de < dlimit) {
1018                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
1019                 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
1020                              offset, de_len, de->name_len, de->name,
1021                              de->name_len, le32_to_cpu(de->inode));
1022                 if (ext4_check_dir_entry(dir, NULL, de, bh,
1023                                          inline_start, inline_size, offset))
1024                         BUG();
1025
1026                 offset += de_len;
1027                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
1028         }
1029 }
1030 #else
1031 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
1032 #endif
1033
1034 /*
1035  * Add a new entry into a inline dir.
1036  * It will return -ENOSPC if no space is available, and -EIO
1037  * and -EEXIST if directory entry already exists.
1038  */
1039 static int ext4_add_dirent_to_inline(handle_t *handle,
1040                                      struct ext4_filename *fname,
1041                                      struct inode *dir,
1042                                      struct inode *inode,
1043                                      struct ext4_iloc *iloc,
1044                                      void *inline_start, int inline_size)
1045 {
1046         int             err;
1047         struct ext4_dir_entry_2 *de;
1048
1049         err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1050                                 inline_size, fname, &de);
1051         if (err)
1052                 return err;
1053
1054         BUFFER_TRACE(iloc->bh, "get_write_access");
1055         err = ext4_journal_get_write_access(handle, iloc->bh);
1056         if (err)
1057                 return err;
1058         ext4_insert_dentry(inode, de, inline_size, fname);
1059
1060         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1061
1062         /*
1063          * XXX shouldn't update any times until successful
1064          * completion of syscall, but too many callers depend
1065          * on this.
1066          *
1067          * XXX similarly, too many callers depend on
1068          * ext4_new_inode() setting the times, but error
1069          * recovery deletes the inode, so the worst that can
1070          * happen is that the times are slightly out of date
1071          * and/or different from the directory change time.
1072          */
1073         dir->i_mtime = dir->i_ctime = current_time(dir);
1074         ext4_update_dx_flag(dir);
1075         dir->i_version++;
1076         return 1;
1077 }
1078
1079 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1080                                        struct ext4_iloc *iloc)
1081 {
1082         struct ext4_xattr_entry *entry;
1083         struct ext4_xattr_ibody_header *header;
1084
1085         BUG_ON(!EXT4_I(inode)->i_inline_off);
1086
1087         header = IHDR(inode, ext4_raw_inode(iloc));
1088         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1089                                             EXT4_I(inode)->i_inline_off);
1090
1091         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1092 }
1093
1094 /* Set the final de to cover the whole block. */
1095 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1096 {
1097         struct ext4_dir_entry_2 *de, *prev_de;
1098         void *limit;
1099         int de_len;
1100
1101         de = (struct ext4_dir_entry_2 *)de_buf;
1102         if (old_size) {
1103                 limit = de_buf + old_size;
1104                 do {
1105                         prev_de = de;
1106                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1107                         de_buf += de_len;
1108                         de = (struct ext4_dir_entry_2 *)de_buf;
1109                 } while (de_buf < limit);
1110
1111                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1112                                                         old_size, new_size);
1113         } else {
1114                 /* this is just created, so create an empty entry. */
1115                 de->inode = 0;
1116                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1117         }
1118 }
1119
1120 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1121                                   struct ext4_iloc *iloc)
1122 {
1123         int ret;
1124         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1125         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1126
1127         if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1128                 return -ENOSPC;
1129
1130         ret = ext4_update_inline_data(handle, dir,
1131                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1132         if (ret)
1133                 return ret;
1134
1135         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1136                              EXT4_I(dir)->i_inline_size -
1137                                                 EXT4_MIN_INLINE_DATA_SIZE);
1138         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1139         return 0;
1140 }
1141
1142 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1143                                      struct ext4_iloc *iloc,
1144                                      void *buf, int inline_size)
1145 {
1146         int ret;
1147
1148         ret = ext4_create_inline_data(handle, inode, inline_size);
1149         if (ret) {
1150                 ext4_msg(inode->i_sb, KERN_EMERG,
1151                         "error restoring inline_data for inode -- potential data loss! (inode %lu, error %d)",
1152                         inode->i_ino, ret);
1153                 return;
1154         }
1155         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1156         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1157 }
1158
1159 static int ext4_finish_convert_inline_dir(handle_t *handle,
1160                                           struct inode *inode,
1161                                           struct buffer_head *dir_block,
1162                                           void *buf,
1163                                           int inline_size)
1164 {
1165         int err, csum_size = 0, header_size = 0;
1166         struct ext4_dir_entry_2 *de;
1167         struct ext4_dir_entry_tail *t;
1168         void *target = dir_block->b_data;
1169
1170         /*
1171          * First create "." and ".." and then copy the dir information
1172          * back to the block.
1173          */
1174         de = (struct ext4_dir_entry_2 *)target;
1175         de = ext4_init_dot_dotdot(inode, de,
1176                 inode->i_sb->s_blocksize, csum_size,
1177                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1178         header_size = (void *)de - target;
1179
1180         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1181                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1182
1183         if (ext4_has_metadata_csum(inode->i_sb))
1184                 csum_size = sizeof(struct ext4_dir_entry_tail);
1185
1186         inode->i_size = inode->i_sb->s_blocksize;
1187         i_size_write(inode, inode->i_sb->s_blocksize);
1188         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1189         ext4_update_final_de(dir_block->b_data,
1190                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1191                         inode->i_sb->s_blocksize - csum_size);
1192
1193         if (csum_size) {
1194                 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1195                                      inode->i_sb->s_blocksize);
1196                 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1197         }
1198         set_buffer_uptodate(dir_block);
1199         err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1200         if (err)
1201                 return err;
1202         set_buffer_verified(dir_block);
1203         return ext4_mark_inode_dirty(handle, inode);
1204 }
1205
1206 static int ext4_convert_inline_data_nolock(handle_t *handle,
1207                                            struct inode *inode,
1208                                            struct ext4_iloc *iloc)
1209 {
1210         int error;
1211         void *buf = NULL;
1212         struct buffer_head *data_bh = NULL;
1213         struct ext4_map_blocks map;
1214         int inline_size;
1215
1216         inline_size = ext4_get_inline_size(inode);
1217         buf = kmalloc(inline_size, GFP_NOFS);
1218         if (!buf) {
1219                 error = -ENOMEM;
1220                 goto out;
1221         }
1222
1223         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1224         if (error < 0)
1225                 goto out;
1226
1227         /*
1228          * Make sure the inline directory entries pass checks before we try to
1229          * convert them, so that we avoid touching stuff that needs fsck.
1230          */
1231         if (S_ISDIR(inode->i_mode)) {
1232                 error = ext4_check_all_de(inode, iloc->bh,
1233                                         buf + EXT4_INLINE_DOTDOT_SIZE,
1234                                         inline_size - EXT4_INLINE_DOTDOT_SIZE);
1235                 if (error)
1236                         goto out;
1237         }
1238
1239         error = ext4_destroy_inline_data_nolock(handle, inode);
1240         if (error)
1241                 goto out;
1242
1243         map.m_lblk = 0;
1244         map.m_len = 1;
1245         map.m_flags = 0;
1246         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1247         if (error < 0)
1248                 goto out_restore;
1249         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1250                 error = -EIO;
1251                 goto out_restore;
1252         }
1253
1254         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1255         if (!data_bh) {
1256                 error = -ENOMEM;
1257                 goto out_restore;
1258         }
1259
1260         lock_buffer(data_bh);
1261         error = ext4_journal_get_create_access(handle, data_bh);
1262         if (error) {
1263                 unlock_buffer(data_bh);
1264                 error = -EIO;
1265                 goto out_restore;
1266         }
1267         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1268
1269         if (!S_ISDIR(inode->i_mode)) {
1270                 memcpy(data_bh->b_data, buf, inline_size);
1271                 set_buffer_uptodate(data_bh);
1272                 error = ext4_handle_dirty_metadata(handle,
1273                                                    inode, data_bh);
1274         } else {
1275                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1276                                                        buf, inline_size);
1277         }
1278
1279         unlock_buffer(data_bh);
1280 out_restore:
1281         if (error)
1282                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1283
1284 out:
1285         brelse(data_bh);
1286         kfree(buf);
1287         return error;
1288 }
1289
1290 /*
1291  * Try to add the new entry to the inline data.
1292  * If succeeds, return 0. If not, extended the inline dir and copied data to
1293  * the new created block.
1294  */
1295 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1296                               struct inode *dir, struct inode *inode)
1297 {
1298         int ret, inline_size, no_expand;
1299         void *inline_start;
1300         struct ext4_iloc iloc;
1301
1302         ret = ext4_get_inode_loc(dir, &iloc);
1303         if (ret)
1304                 return ret;
1305
1306         ext4_write_lock_xattr(dir, &no_expand);
1307         if (!ext4_has_inline_data(dir))
1308                 goto out;
1309
1310         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1311                                                  EXT4_INLINE_DOTDOT_SIZE;
1312         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1313
1314         ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1315                                         inline_start, inline_size);
1316         if (ret != -ENOSPC)
1317                 goto out;
1318
1319         /* check whether it can be inserted to inline xattr space. */
1320         inline_size = EXT4_I(dir)->i_inline_size -
1321                         EXT4_MIN_INLINE_DATA_SIZE;
1322         if (!inline_size) {
1323                 /* Try to use the xattr space.*/
1324                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1325                 if (ret && ret != -ENOSPC)
1326                         goto out;
1327
1328                 inline_size = EXT4_I(dir)->i_inline_size -
1329                                 EXT4_MIN_INLINE_DATA_SIZE;
1330         }
1331
1332         if (inline_size) {
1333                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1334
1335                 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1336                                                 inode, &iloc, inline_start,
1337                                                 inline_size);
1338
1339                 if (ret != -ENOSPC)
1340                         goto out;
1341         }
1342
1343         /*
1344          * The inline space is filled up, so create a new block for it.
1345          * As the extent tree will be created, we have to save the inline
1346          * dir first.
1347          */
1348         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1349
1350 out:
1351         ext4_write_unlock_xattr(dir, &no_expand);
1352         ext4_mark_inode_dirty(handle, dir);
1353         brelse(iloc.bh);
1354         return ret;
1355 }
1356
1357 /*
1358  * This function fills a red-black tree with information from an
1359  * inlined dir.  It returns the number directory entries loaded
1360  * into the tree.  If there is an error it is returned in err.
1361  */
1362 int htree_inlinedir_to_tree(struct file *dir_file,
1363                             struct inode *dir, ext4_lblk_t block,
1364                             struct dx_hash_info *hinfo,
1365                             __u32 start_hash, __u32 start_minor_hash,
1366                             int *has_inline_data)
1367 {
1368         int err = 0, count = 0;
1369         unsigned int parent_ino;
1370         int pos;
1371         struct ext4_dir_entry_2 *de;
1372         struct inode *inode = file_inode(dir_file);
1373         int ret, inline_size = 0;
1374         struct ext4_iloc iloc;
1375         void *dir_buf = NULL;
1376         struct ext4_dir_entry_2 fake;
1377         struct fscrypt_str tmp_str;
1378
1379         ret = ext4_get_inode_loc(inode, &iloc);
1380         if (ret)
1381                 return ret;
1382
1383         down_read(&EXT4_I(inode)->xattr_sem);
1384         if (!ext4_has_inline_data(inode)) {
1385                 up_read(&EXT4_I(inode)->xattr_sem);
1386                 *has_inline_data = 0;
1387                 goto out;
1388         }
1389
1390         inline_size = ext4_get_inline_size(inode);
1391         dir_buf = kmalloc(inline_size, GFP_NOFS);
1392         if (!dir_buf) {
1393                 ret = -ENOMEM;
1394                 up_read(&EXT4_I(inode)->xattr_sem);
1395                 goto out;
1396         }
1397
1398         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1399         up_read(&EXT4_I(inode)->xattr_sem);
1400         if (ret < 0)
1401                 goto out;
1402
1403         pos = 0;
1404         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1405         while (pos < inline_size) {
1406                 /*
1407                  * As inlined dir doesn't store any information about '.' and
1408                  * only the inode number of '..' is stored, we have to handle
1409                  * them differently.
1410                  */
1411                 if (pos == 0) {
1412                         fake.inode = cpu_to_le32(inode->i_ino);
1413                         fake.name_len = 1;
1414                         strcpy(fake.name, ".");
1415                         fake.rec_len = ext4_rec_len_to_disk(
1416                                                 EXT4_DIR_REC_LEN(fake.name_len),
1417                                                 inline_size);
1418                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1419                         de = &fake;
1420                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1421                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1422                         fake.inode = cpu_to_le32(parent_ino);
1423                         fake.name_len = 2;
1424                         strcpy(fake.name, "..");
1425                         fake.rec_len = ext4_rec_len_to_disk(
1426                                                 EXT4_DIR_REC_LEN(fake.name_len),
1427                                                 inline_size);
1428                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1429                         de = &fake;
1430                         pos = EXT4_INLINE_DOTDOT_SIZE;
1431                 } else {
1432                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1433                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1434                         if (ext4_check_dir_entry(inode, dir_file, de,
1435                                          iloc.bh, dir_buf,
1436                                          inline_size, pos)) {
1437                                 ret = count;
1438                                 goto out;
1439                         }
1440                 }
1441
1442                 ext4fs_dirhash(de->name, de->name_len, hinfo);
1443                 if ((hinfo->hash < start_hash) ||
1444                     ((hinfo->hash == start_hash) &&
1445                      (hinfo->minor_hash < start_minor_hash)))
1446                         continue;
1447                 if (de->inode == 0)
1448                         continue;
1449                 tmp_str.name = de->name;
1450                 tmp_str.len = de->name_len;
1451                 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1452                                               hinfo->minor_hash, de, &tmp_str);
1453                 if (err) {
1454                         ret = err;
1455                         goto out;
1456                 }
1457                 count++;
1458         }
1459         ret = count;
1460 out:
1461         kfree(dir_buf);
1462         brelse(iloc.bh);
1463         return ret;
1464 }
1465
1466 /*
1467  * So this function is called when the volume is mkfsed with
1468  * dir_index disabled. In order to keep f_pos persistent
1469  * after we convert from an inlined dir to a blocked based,
1470  * we just pretend that we are a normal dir and return the
1471  * offset as if '.' and '..' really take place.
1472  *
1473  */
1474 int ext4_read_inline_dir(struct file *file,
1475                          struct dir_context *ctx,
1476                          int *has_inline_data)
1477 {
1478         unsigned int offset, parent_ino;
1479         int i;
1480         struct ext4_dir_entry_2 *de;
1481         struct super_block *sb;
1482         struct inode *inode = file_inode(file);
1483         int ret, inline_size = 0;
1484         struct ext4_iloc iloc;
1485         void *dir_buf = NULL;
1486         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1487
1488         ret = ext4_get_inode_loc(inode, &iloc);
1489         if (ret)
1490                 return ret;
1491
1492         down_read(&EXT4_I(inode)->xattr_sem);
1493         if (!ext4_has_inline_data(inode)) {
1494                 up_read(&EXT4_I(inode)->xattr_sem);
1495                 *has_inline_data = 0;
1496                 goto out;
1497         }
1498
1499         inline_size = ext4_get_inline_size(inode);
1500         dir_buf = kmalloc(inline_size, GFP_NOFS);
1501         if (!dir_buf) {
1502                 ret = -ENOMEM;
1503                 up_read(&EXT4_I(inode)->xattr_sem);
1504                 goto out;
1505         }
1506
1507         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1508         up_read(&EXT4_I(inode)->xattr_sem);
1509         if (ret < 0)
1510                 goto out;
1511
1512         ret = 0;
1513         sb = inode->i_sb;
1514         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1515         offset = ctx->pos;
1516
1517         /*
1518          * dotdot_offset and dotdot_size is the real offset and
1519          * size for ".." and "." if the dir is block based while
1520          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1521          * So we will use extra_offset and extra_size to indicate them
1522          * during the inline dir iteration.
1523          */
1524         dotdot_offset = EXT4_DIR_REC_LEN(1);
1525         dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1526         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1527         extra_size = extra_offset + inline_size;
1528
1529         /*
1530          * If the version has changed since the last call to
1531          * readdir(2), then we might be pointing to an invalid
1532          * dirent right now.  Scan from the start of the inline
1533          * dir to make sure.
1534          */
1535         if (file->f_version != inode->i_version) {
1536                 for (i = 0; i < extra_size && i < offset;) {
1537                         /*
1538                          * "." is with offset 0 and
1539                          * ".." is dotdot_offset.
1540                          */
1541                         if (!i) {
1542                                 i = dotdot_offset;
1543                                 continue;
1544                         } else if (i == dotdot_offset) {
1545                                 i = dotdot_size;
1546                                 continue;
1547                         }
1548                         /* for other entry, the real offset in
1549                          * the buf has to be tuned accordingly.
1550                          */
1551                         de = (struct ext4_dir_entry_2 *)
1552                                 (dir_buf + i - extra_offset);
1553                         /* It's too expensive to do a full
1554                          * dirent test each time round this
1555                          * loop, but we do have to test at
1556                          * least that it is non-zero.  A
1557                          * failure will be detected in the
1558                          * dirent test below. */
1559                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1560                                 < EXT4_DIR_REC_LEN(1))
1561                                 break;
1562                         i += ext4_rec_len_from_disk(de->rec_len,
1563                                                     extra_size);
1564                 }
1565                 offset = i;
1566                 ctx->pos = offset;
1567                 file->f_version = inode->i_version;
1568         }
1569
1570         while (ctx->pos < extra_size) {
1571                 if (ctx->pos == 0) {
1572                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1573                                 goto out;
1574                         ctx->pos = dotdot_offset;
1575                         continue;
1576                 }
1577
1578                 if (ctx->pos == dotdot_offset) {
1579                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1580                                 goto out;
1581                         ctx->pos = dotdot_size;
1582                         continue;
1583                 }
1584
1585                 de = (struct ext4_dir_entry_2 *)
1586                         (dir_buf + ctx->pos - extra_offset);
1587                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1588                                          extra_size, ctx->pos))
1589                         goto out;
1590                 if (le32_to_cpu(de->inode)) {
1591                         if (!dir_emit(ctx, de->name, de->name_len,
1592                                       le32_to_cpu(de->inode),
1593                                       get_dtype(sb, de->file_type)))
1594                                 goto out;
1595                 }
1596                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1597         }
1598 out:
1599         kfree(dir_buf);
1600         brelse(iloc.bh);
1601         return ret;
1602 }
1603
1604 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1605                                         struct ext4_dir_entry_2 **parent_de,
1606                                         int *retval)
1607 {
1608         struct ext4_iloc iloc;
1609
1610         *retval = ext4_get_inode_loc(inode, &iloc);
1611         if (*retval)
1612                 return NULL;
1613
1614         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1615
1616         return iloc.bh;
1617 }
1618
1619 /*
1620  * Try to create the inline data for the new dir.
1621  * If it succeeds, return 0, otherwise return the error.
1622  * In case of ENOSPC, the caller should create the normal disk layout dir.
1623  */
1624 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1625                                struct inode *inode)
1626 {
1627         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1628         struct ext4_iloc iloc;
1629         struct ext4_dir_entry_2 *de;
1630
1631         ret = ext4_get_inode_loc(inode, &iloc);
1632         if (ret)
1633                 return ret;
1634
1635         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1636         if (ret)
1637                 goto out;
1638
1639         /*
1640          * For inline dir, we only save the inode information for the ".."
1641          * and create a fake dentry to cover the left space.
1642          */
1643         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1644         de->inode = cpu_to_le32(parent->i_ino);
1645         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1646         de->inode = 0;
1647         de->rec_len = ext4_rec_len_to_disk(
1648                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1649                                 inline_size);
1650         set_nlink(inode, 2);
1651         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1652 out:
1653         brelse(iloc.bh);
1654         return ret;
1655 }
1656
1657 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1658                                         struct ext4_filename *fname,
1659                                         struct ext4_dir_entry_2 **res_dir,
1660                                         int *has_inline_data)
1661 {
1662         int ret;
1663         struct ext4_iloc iloc;
1664         void *inline_start;
1665         int inline_size;
1666
1667         if (ext4_get_inode_loc(dir, &iloc))
1668                 return NULL;
1669
1670         down_read(&EXT4_I(dir)->xattr_sem);
1671         if (!ext4_has_inline_data(dir)) {
1672                 *has_inline_data = 0;
1673                 goto out;
1674         }
1675
1676         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1677                                                 EXT4_INLINE_DOTDOT_SIZE;
1678         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1679         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1680                               dir, fname, 0, res_dir);
1681         if (ret == 1)
1682                 goto out_find;
1683         if (ret < 0)
1684                 goto out;
1685
1686         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1687                 goto out;
1688
1689         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1690         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1691
1692         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1693                               dir, fname, 0, res_dir);
1694         if (ret == 1)
1695                 goto out_find;
1696
1697 out:
1698         brelse(iloc.bh);
1699         iloc.bh = NULL;
1700 out_find:
1701         up_read(&EXT4_I(dir)->xattr_sem);
1702         return iloc.bh;
1703 }
1704
1705 int ext4_delete_inline_entry(handle_t *handle,
1706                              struct inode *dir,
1707                              struct ext4_dir_entry_2 *de_del,
1708                              struct buffer_head *bh,
1709                              int *has_inline_data)
1710 {
1711         int err, inline_size, no_expand;
1712         struct ext4_iloc iloc;
1713         void *inline_start;
1714
1715         err = ext4_get_inode_loc(dir, &iloc);
1716         if (err)
1717                 return err;
1718
1719         ext4_write_lock_xattr(dir, &no_expand);
1720         if (!ext4_has_inline_data(dir)) {
1721                 *has_inline_data = 0;
1722                 goto out;
1723         }
1724
1725         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1726                 EXT4_MIN_INLINE_DATA_SIZE) {
1727                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1728                                         EXT4_INLINE_DOTDOT_SIZE;
1729                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1730                                 EXT4_INLINE_DOTDOT_SIZE;
1731         } else {
1732                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1733                 inline_size = ext4_get_inline_size(dir) -
1734                                 EXT4_MIN_INLINE_DATA_SIZE;
1735         }
1736
1737         BUFFER_TRACE(bh, "get_write_access");
1738         err = ext4_journal_get_write_access(handle, bh);
1739         if (err)
1740                 goto out;
1741
1742         err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1743                                         inline_start, inline_size, 0);
1744         if (err)
1745                 goto out;
1746
1747         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1748 out:
1749         ext4_write_unlock_xattr(dir, &no_expand);
1750         if (likely(err == 0))
1751                 err = ext4_mark_inode_dirty(handle, dir);
1752         brelse(iloc.bh);
1753         if (err != -ENOENT)
1754                 ext4_std_error(dir->i_sb, err);
1755         return err;
1756 }
1757
1758 /*
1759  * Get the inline dentry at offset.
1760  */
1761 static inline struct ext4_dir_entry_2 *
1762 ext4_get_inline_entry(struct inode *inode,
1763                       struct ext4_iloc *iloc,
1764                       unsigned int offset,
1765                       void **inline_start,
1766                       int *inline_size)
1767 {
1768         void *inline_pos;
1769
1770         BUG_ON(offset > ext4_get_inline_size(inode));
1771
1772         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1773                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1774                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1775         } else {
1776                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1777                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1778                 *inline_size = ext4_get_inline_size(inode) -
1779                                 EXT4_MIN_INLINE_DATA_SIZE;
1780         }
1781
1782         if (inline_start)
1783                 *inline_start = inline_pos;
1784         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1785 }
1786
1787 bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1788 {
1789         int err, inline_size;
1790         struct ext4_iloc iloc;
1791         size_t inline_len;
1792         void *inline_pos;
1793         unsigned int offset;
1794         struct ext4_dir_entry_2 *de;
1795         bool ret = true;
1796
1797         err = ext4_get_inode_loc(dir, &iloc);
1798         if (err) {
1799                 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1800                                  err, dir->i_ino);
1801                 return true;
1802         }
1803
1804         down_read(&EXT4_I(dir)->xattr_sem);
1805         if (!ext4_has_inline_data(dir)) {
1806                 *has_inline_data = 0;
1807                 goto out;
1808         }
1809
1810         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1811         if (!le32_to_cpu(de->inode)) {
1812                 ext4_warning(dir->i_sb,
1813                              "bad inline directory (dir #%lu) - no `..'",
1814                              dir->i_ino);
1815                 ret = true;
1816                 goto out;
1817         }
1818
1819         inline_len = ext4_get_inline_size(dir);
1820         offset = EXT4_INLINE_DOTDOT_SIZE;
1821         while (offset < inline_len) {
1822                 de = ext4_get_inline_entry(dir, &iloc, offset,
1823                                            &inline_pos, &inline_size);
1824                 if (ext4_check_dir_entry(dir, NULL, de,
1825                                          iloc.bh, inline_pos,
1826                                          inline_size, offset)) {
1827                         ext4_warning(dir->i_sb,
1828                                      "bad inline directory (dir #%lu) - "
1829                                      "inode %u, rec_len %u, name_len %d"
1830                                      "inline size %d",
1831                                      dir->i_ino, le32_to_cpu(de->inode),
1832                                      le16_to_cpu(de->rec_len), de->name_len,
1833                                      inline_size);
1834                         ret = true;
1835                         goto out;
1836                 }
1837                 if (le32_to_cpu(de->inode)) {
1838                         ret = false;
1839                         goto out;
1840                 }
1841                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1842         }
1843
1844 out:
1845         up_read(&EXT4_I(dir)->xattr_sem);
1846         brelse(iloc.bh);
1847         return ret;
1848 }
1849
1850 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1851 {
1852         int ret, no_expand;
1853
1854         ext4_write_lock_xattr(inode, &no_expand);
1855         ret = ext4_destroy_inline_data_nolock(handle, inode);
1856         ext4_write_unlock_xattr(inode, &no_expand);
1857
1858         return ret;
1859 }
1860
1861 int ext4_inline_data_fiemap(struct inode *inode,
1862                             struct fiemap_extent_info *fieinfo,
1863                             int *has_inline, __u64 start, __u64 len)
1864 {
1865         __u64 physical = 0;
1866         __u64 inline_len;
1867         __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
1868                 FIEMAP_EXTENT_LAST;
1869         int error = 0;
1870         struct ext4_iloc iloc;
1871
1872         down_read(&EXT4_I(inode)->xattr_sem);
1873         if (!ext4_has_inline_data(inode)) {
1874                 *has_inline = 0;
1875                 goto out;
1876         }
1877         inline_len = min_t(size_t, ext4_get_inline_size(inode),
1878                            i_size_read(inode));
1879         if (start >= inline_len)
1880                 goto out;
1881         if (start + len < inline_len)
1882                 inline_len = start + len;
1883         inline_len -= start;
1884
1885         error = ext4_get_inode_loc(inode, &iloc);
1886         if (error)
1887                 goto out;
1888
1889         physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1890         physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1891         physical += offsetof(struct ext4_inode, i_block);
1892
1893         brelse(iloc.bh);
1894 out:
1895         up_read(&EXT4_I(inode)->xattr_sem);
1896         if (physical)
1897                 error = fiemap_fill_next_extent(fieinfo, start, physical,
1898                                                 inline_len, flags);
1899         return (error < 0 ? error : 0);
1900 }
1901
1902 int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1903 {
1904         handle_t *handle;
1905         int inline_size, value_len, needed_blocks, no_expand, err = 0;
1906         size_t i_size;
1907         void *value = NULL;
1908         struct ext4_xattr_ibody_find is = {
1909                 .s = { .not_found = -ENODATA, },
1910         };
1911         struct ext4_xattr_info i = {
1912                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1913                 .name = EXT4_XATTR_SYSTEM_DATA,
1914         };
1915
1916
1917         needed_blocks = ext4_writepage_trans_blocks(inode);
1918         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1919         if (IS_ERR(handle))
1920                 return PTR_ERR(handle);
1921
1922         ext4_write_lock_xattr(inode, &no_expand);
1923         if (!ext4_has_inline_data(inode)) {
1924                 ext4_write_unlock_xattr(inode, &no_expand);
1925                 *has_inline = 0;
1926                 ext4_journal_stop(handle);
1927                 return 0;
1928         }
1929
1930         if ((err = ext4_orphan_add(handle, inode)) != 0)
1931                 goto out;
1932
1933         if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1934                 goto out;
1935
1936         down_write(&EXT4_I(inode)->i_data_sem);
1937         i_size = inode->i_size;
1938         inline_size = ext4_get_inline_size(inode);
1939         EXT4_I(inode)->i_disksize = i_size;
1940
1941         if (i_size < inline_size) {
1942                 /* Clear the content in the xattr space. */
1943                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1944                         if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1945                                 goto out_error;
1946
1947                         BUG_ON(is.s.not_found);
1948
1949                         value_len = le32_to_cpu(is.s.here->e_value_size);
1950                         value = kmalloc(value_len, GFP_NOFS);
1951                         if (!value) {
1952                                 err = -ENOMEM;
1953                                 goto out_error;
1954                         }
1955
1956                         err = ext4_xattr_ibody_get(inode, i.name_index,
1957                                                    i.name, value, value_len);
1958                         if (err <= 0)
1959                                 goto out_error;
1960
1961                         i.value = value;
1962                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1963                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1964                         err = ext4_xattr_ibody_set(handle, inode, &i, &is);
1965                         if (err)
1966                                 goto out_error;
1967                 }
1968
1969                 /* Clear the content within i_blocks. */
1970                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1971                         void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1972                         memset(p + i_size, 0,
1973                                EXT4_MIN_INLINE_DATA_SIZE - i_size);
1974                 }
1975
1976                 EXT4_I(inode)->i_inline_size = i_size <
1977                                         EXT4_MIN_INLINE_DATA_SIZE ?
1978                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
1979         }
1980
1981 out_error:
1982         up_write(&EXT4_I(inode)->i_data_sem);
1983 out:
1984         brelse(is.iloc.bh);
1985         ext4_write_unlock_xattr(inode, &no_expand);
1986         kfree(value);
1987         if (inode->i_nlink)
1988                 ext4_orphan_del(handle, inode);
1989
1990         if (err == 0) {
1991                 inode->i_mtime = inode->i_ctime = current_time(inode);
1992                 err = ext4_mark_inode_dirty(handle, inode);
1993                 if (IS_SYNC(inode))
1994                         ext4_handle_sync(handle);
1995         }
1996         ext4_journal_stop(handle);
1997         return err;
1998 }
1999
2000 int ext4_convert_inline_data(struct inode *inode)
2001 {
2002         int error, needed_blocks, no_expand;
2003         handle_t *handle;
2004         struct ext4_iloc iloc;
2005
2006         if (!ext4_has_inline_data(inode)) {
2007                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2008                 return 0;
2009         } else if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
2010                 /*
2011                  * Inode has inline data but EXT4_STATE_MAY_INLINE_DATA is
2012                  * cleared. This means we are in the middle of moving of
2013                  * inline data to delay allocated block. Just force writeout
2014                  * here to finish conversion.
2015                  */
2016                 error = filemap_flush(inode->i_mapping);
2017                 if (error)
2018                         return error;
2019                 if (!ext4_has_inline_data(inode))
2020                         return 0;
2021         }
2022
2023         needed_blocks = ext4_writepage_trans_blocks(inode);
2024
2025         iloc.bh = NULL;
2026         error = ext4_get_inode_loc(inode, &iloc);
2027         if (error)
2028                 return error;
2029
2030         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2031         if (IS_ERR(handle)) {
2032                 error = PTR_ERR(handle);
2033                 goto out_free;
2034         }
2035
2036         ext4_write_lock_xattr(inode, &no_expand);
2037         if (ext4_has_inline_data(inode))
2038                 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2039         ext4_write_unlock_xattr(inode, &no_expand);
2040         ext4_journal_stop(handle);
2041 out_free:
2042         brelse(iloc.bh);
2043         return error;
2044 }