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         int free, min_offs;
  42
  43         min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
  44                         EXT4_GOOD_OLD_INODE_SIZE -
  45                         EXT4_I(inode)->i_extra_isize -
  46                         sizeof(struct ext4_xattr_ibody_header);
  47
  48         /*
  49          * We need to subtract another sizeof(__u32) since an in-inode xattr
  50          * needs an empty 4 bytes to indicate the gap between the xattr entry
  51          * and the name/value pair.
  52          */
  53         if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
  54                 return EXT4_XATTR_SIZE(min_offs -
  55                         EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
  56                         EXT4_XATTR_ROUND - sizeof(__u32));
  57
  58         raw_inode = ext4_raw_inode(iloc);
  59         header = IHDR(inode, raw_inode);
  60         entry = IFIRST(header);
  61
  62         /* Compute min_offs. */
  63         for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
  64                 if (!entry->e_value_inum && entry->e_value_size) {
  65                         size_t offs = le16_to_cpu(entry->e_value_offs);
  66                         if (offs < min_offs)
  67                                 min_offs = offs;
  68                 }
  69         }
  70         free = min_offs -
  71                 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
  72
  73         if (EXT4_I(inode)->i_inline_off) {
  74                 entry = (struct ext4_xattr_entry *)
  75                         ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
  76
  77                 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
  78                 goto out;
  79         }
  80
  81         free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
  82
  83         if (free > EXT4_XATTR_ROUND)
  84                 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
  85         else
  86                 free = 0;
  87
  88 out:
  89         return free;
  90 }
  91
  92 /*
  93  * Get the maximum size we now can store in an inode.
  94  * If we can't find the space for a xattr entry, don't use the space
  95  * of the extents since we have no space to indicate the inline data.
  96  */
  97 int ext4_get_max_inline_size(struct inode *inode)
  98 {
  99         int error, max_inline_size;
 100         struct ext4_iloc iloc;
 101
 102         if (EXT4_I(inode)->i_extra_isize == 0)
 103                 return 0;
 104
 105         error = ext4_get_inode_loc(inode, &iloc);
 106         if (error) {
 107                 ext4_error_inode(inode, __func__, __LINE__, 0,
 108                                  "can't get inode location %lu",
 109                                  inode->i_ino);
 110                 return 0;
 111         }
 112
 113         down_read(&EXT4_I(inode)->xattr_sem);
 114         max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
 115         up_read(&EXT4_I(inode)->xattr_sem);
 116
 117         brelse(iloc.bh);
 118
 119         if (!max_inline_size)
 120                 return 0;
 121
 122         return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
 123 }
 124
 125 /*
 126  * this function does not take xattr_sem, which is OK because it is
 127  * currently only used in a code path coming form ext4_iget, before
 128  * the new inode has been unlocked
 129  */
 130 int ext4_find_inline_data_nolock(struct inode *inode)
 131 {
 132         struct ext4_xattr_ibody_find is = {
 133                 .s = { .not_found = -ENODATA, },
 134         };
 135         struct ext4_xattr_info i = {
 136                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 137                 .name = EXT4_XATTR_SYSTEM_DATA,
 138         };
 139         int error;
 140
 141         if (EXT4_I(inode)->i_extra_isize == 0)
 142                 return 0;
 143
 144         error = ext4_get_inode_loc(inode, &is.iloc);
 145         if (error)
 146                 return error;
 147
 148         error = ext4_xattr_ibody_find(inode, &i, &is);
 149         if (error)
 150                 goto out;
 151
 152         if (!is.s.not_found) {
 153                 if (is.s.here->e_value_inum) {
 154                         EXT4_ERROR_INODE(inode, "inline data xattr refers "
 155                                          "to an external xattr inode");
 156                         error = -EFSCORRUPTED;
 157                         goto out;
 158                 }
 159                 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 160                                         (void *)ext4_raw_inode(&is.iloc));
 161                 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 162                                 le32_to_cpu(is.s.here->e_value_size);
 163                 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 164         }
 165 out:
 166         brelse(is.iloc.bh);
 167         return error;
 168 }
 169
 170 static int ext4_read_inline_data(struct inode *inode, void *buffer,
 171                                  unsigned int len,
 172                                  struct ext4_iloc *iloc)
 173 {
 174         struct ext4_xattr_entry *entry;
 175         struct ext4_xattr_ibody_header *header;
 176         int cp_len = 0;
 177         struct ext4_inode *raw_inode;
 178
 179         if (!len)
 180                 return 0;
 181
 182         BUG_ON(len > EXT4_I(inode)->i_inline_size);
 183
 184         cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
 185                         len : EXT4_MIN_INLINE_DATA_SIZE;
 186
 187         raw_inode = ext4_raw_inode(iloc);
 188         memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
 189
 190         len -= cp_len;
 191         buffer += cp_len;
 192
 193         if (!len)
 194                 goto out;
 195
 196         header = IHDR(inode, raw_inode);
 197         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 198                                             EXT4_I(inode)->i_inline_off);
 199         len = min_t(unsigned int, len,
 200                     (unsigned int)le32_to_cpu(entry->e_value_size));
 201
 202         memcpy(buffer,
 203                (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
 204         cp_len += len;
 205
 206 out:
 207         return cp_len;
 208 }
 209
 210 /*
 211  * write the buffer to the inline inode.
 212  * If 'create' is set, we don't need to do the extra copy in the xattr
 213  * value since it is already handled by ext4_xattr_ibody_inline_set.
 214  * That saves us one memcpy.
 215  */
 216 static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
 217                                    void *buffer, loff_t pos, unsigned int len)
 218 {
 219         struct ext4_xattr_entry *entry;
 220         struct ext4_xattr_ibody_header *header;
 221         struct ext4_inode *raw_inode;
 222         int cp_len = 0;
 223
 224         if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
 225                 return;
 226
 227         BUG_ON(!EXT4_I(inode)->i_inline_off);
 228         BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
 229
 230         raw_inode = ext4_raw_inode(iloc);
 231         buffer += pos;
 232
 233         if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
 234                 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
 235                          EXT4_MIN_INLINE_DATA_SIZE - pos : len;
 236                 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
 237
 238                 len -= cp_len;
 239                 buffer += cp_len;
 240                 pos += cp_len;
 241         }
 242
 243         if (!len)
 244                 return;
 245
 246         pos -= EXT4_MIN_INLINE_DATA_SIZE;
 247         header = IHDR(inode, raw_inode);
 248         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 249                                             EXT4_I(inode)->i_inline_off);
 250
 251         memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
 252                buffer, len);
 253 }
 254
 255 static int ext4_create_inline_data(handle_t *handle,
 256                                    struct inode *inode, unsigned len)
 257 {
 258         int error;
 259         void *value = NULL;
 260         struct ext4_xattr_ibody_find is = {
 261                 .s = { .not_found = -ENODATA, },
 262         };
 263         struct ext4_xattr_info i = {
 264                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 265                 .name = EXT4_XATTR_SYSTEM_DATA,
 266         };
 267
 268         error = ext4_get_inode_loc(inode, &is.iloc);
 269         if (error)
 270                 return error;
 271
 272         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 273         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 274         if (error)
 275                 goto out;
 276
 277         if (len > EXT4_MIN_INLINE_DATA_SIZE) {
 278                 value = EXT4_ZERO_XATTR_VALUE;
 279                 len -= EXT4_MIN_INLINE_DATA_SIZE;
 280         } else {
 281                 value = "";
 282                 len = 0;
 283         }
 284
 285         /* Insert the the xttr entry. */
 286         i.value = value;
 287         i.value_len = len;
 288
 289         error = ext4_xattr_ibody_find(inode, &i, &is);
 290         if (error)
 291                 goto out;
 292
 293         BUG_ON(!is.s.not_found);
 294
 295         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 296         if (error) {
 297                 if (error == -ENOSPC)
 298                         ext4_clear_inode_state(inode,
 299                                                EXT4_STATE_MAY_INLINE_DATA);
 300                 goto out;
 301         }
 302
 303         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 304                 0, EXT4_MIN_INLINE_DATA_SIZE);
 305
 306         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 307                                       (void *)ext4_raw_inode(&is.iloc));
 308         EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
 309         ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
 310         ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 311         get_bh(is.iloc.bh);
 312         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 313
 314 out:
 315         brelse(is.iloc.bh);
 316         return error;
 317 }
 318
 319 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
 320                                    unsigned int len)
 321 {
 322         int error;
 323         void *value = NULL;
 324         struct ext4_xattr_ibody_find is = {
 325                 .s = { .not_found = -ENODATA, },
 326         };
 327         struct ext4_xattr_info i = {
 328                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 329                 .name = EXT4_XATTR_SYSTEM_DATA,
 330         };
 331
 332         /* If the old space is ok, write the data directly. */
 333         if (len <= EXT4_I(inode)->i_inline_size)
 334                 return 0;
 335
 336         error = ext4_get_inode_loc(inode, &is.iloc);
 337         if (error)
 338                 return error;
 339
 340         error = ext4_xattr_ibody_find(inode, &i, &is);
 341         if (error)
 342                 goto out;
 343
 344         BUG_ON(is.s.not_found);
 345
 346         len -= EXT4_MIN_INLINE_DATA_SIZE;
 347         value = kzalloc(len, GFP_NOFS);
 348         if (!value) {
 349                 error = -ENOMEM;
 350                 goto out;
 351         }
 352
 353         error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
 354                                      value, len);
 355         if (error == -ENODATA)
 356                 goto out;
 357
 358         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 359         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 360         if (error)
 361                 goto out;
 362
 363         /* Update the xttr entry. */
 364         i.value = value;
 365         i.value_len = len;
 366
 367         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 368         if (error)
 369                 goto out;
 370
 371         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 372                                       (void *)ext4_raw_inode(&is.iloc));
 373         EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 374                                 le32_to_cpu(is.s.here->e_value_size);
 375         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 376         get_bh(is.iloc.bh);
 377         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 378
 379 out:
 380         kfree(value);
 381         brelse(is.iloc.bh);
 382         return error;
 383 }
 384
 385 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
 386                                     unsigned int len)
 387 {
 388         int ret, size, no_expand;
 389         struct ext4_inode_info *ei = EXT4_I(inode);
 390
 391         if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
 392                 return -ENOSPC;
 393
 394         size = ext4_get_max_inline_size(inode);
 395         if (size < len)
 396                 return -ENOSPC;
 397
 398         ext4_write_lock_xattr(inode, &no_expand);
 399
 400         if (ei->i_inline_off)
 401                 ret = ext4_update_inline_data(handle, inode, len);
 402         else
 403                 ret = ext4_create_inline_data(handle, inode, len);
 404
 405         ext4_write_unlock_xattr(inode, &no_expand);
 406         return ret;
 407 }
 408
 409 static int ext4_destroy_inline_data_nolock(handle_t *handle,
 410                                            struct inode *inode)
 411 {
 412         struct ext4_inode_info *ei = EXT4_I(inode);
 413         struct ext4_xattr_ibody_find is = {
 414                 .s = { .not_found = 0, },
 415         };
 416         struct ext4_xattr_info i = {
 417                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 418                 .name = EXT4_XATTR_SYSTEM_DATA,
 419                 .value = NULL,
 420                 .value_len = 0,
 421         };
 422         int error;
 423
 424         if (!ei->i_inline_off)
 425                 return 0;
 426
 427         error = ext4_get_inode_loc(inode, &is.iloc);
 428         if (error)
 429                 return error;
 430
 431         error = ext4_xattr_ibody_find(inode, &i, &is);
 432         if (error)
 433                 goto out;
 434
 435         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 436         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 437         if (error)
 438                 goto out;
 439
 440         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 441         if (error)
 442                 goto out;
 443
 444         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 445                 0, EXT4_MIN_INLINE_DATA_SIZE);
 446         memset(ei->i_data, 0, EXT4_MIN_INLINE_DATA_SIZE);
 447
 448         if (ext4_has_feature_extents(inode->i_sb)) {
 449                 if (S_ISDIR(inode->i_mode) ||
 450                     S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
 451                         ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
 452                         ext4_ext_tree_init(handle, inode);
 453                 }
 454         }
 455         ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 456
 457         get_bh(is.iloc.bh);
 458         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 459
 460         EXT4_I(inode)->i_inline_off = 0;
 461         EXT4_I(inode)->i_inline_size = 0;
 462         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 463 out:
 464         brelse(is.iloc.bh);
 465         if (error == -ENODATA)
 466                 error = 0;
 467         return error;
 468 }
 469
 470 static int ext4_read_inline_page(struct inode *inode, struct page *page)
 471 {
 472         void *kaddr;
 473         int ret = 0;
 474         size_t len;
 475         struct ext4_iloc iloc;
 476
 477         BUG_ON(!PageLocked(page));
 478         BUG_ON(!ext4_has_inline_data(inode));
 479         BUG_ON(page->index);
 480
 481         if (!EXT4_I(inode)->i_inline_off) {
 482                 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
 483                              inode->i_ino);
 484                 goto out;
 485         }
 486
 487         ret = ext4_get_inode_loc(inode, &iloc);
 488         if (ret)
 489                 goto out;
 490
 491         len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
 492         kaddr = kmap_atomic(page);
 493         ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
 494         flush_dcache_page(page);
 495         kunmap_atomic(kaddr);
 496         zero_user_segment(page, len, PAGE_SIZE);
 497         SetPageUptodate(page);
 498         brelse(iloc.bh);
 499
 500 out:
 501         return ret;
 502 }
 503
 504 int ext4_readpage_inline(struct inode *inode, struct page *page)
 505 {
 506         int ret = 0;
 507
 508         down_read(&EXT4_I(inode)->xattr_sem);
 509         if (!ext4_has_inline_data(inode)) {
 510                 up_read(&EXT4_I(inode)->xattr_sem);
 511                 return -EAGAIN;
 512         }
 513
 514         /*
 515          * Current inline data can only exist in the 1st page,
 516          * So for all the other pages, just set them uptodate.
 517          */
 518         if (!page->index)
 519                 ret = ext4_read_inline_page(inode, page);
 520         else if (!PageUptodate(page)) {
 521                 zero_user_segment(page, 0, PAGE_SIZE);
 522                 SetPageUptodate(page);
 523         }
 524
 525         up_read(&EXT4_I(inode)->xattr_sem);
 526
 527         unlock_page(page);
 528         return ret >= 0 ? 0 : ret;
 529 }
 530
 531 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
 532                                               struct inode *inode,
 533                                               unsigned flags)
 534 {
 535         int ret, needed_blocks, no_expand;
 536         handle_t *handle = NULL;
 537         int retries = 0, sem_held = 0;
 538         struct page *page = NULL;
 539         unsigned from, to;
 540         struct ext4_iloc iloc;
 541
 542         if (!ext4_has_inline_data(inode)) {
 543                 /*
 544                  * clear the flag so that no new write
 545                  * will trap here again.
 546                  */
 547                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 548                 return 0;
 549         }
 550
 551         needed_blocks = ext4_writepage_trans_blocks(inode);
 552
 553         ret = ext4_get_inode_loc(inode, &iloc);
 554         if (ret)
 555                 return ret;
 556
 557 retry:
 558         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
 559         if (IS_ERR(handle)) {
 560                 ret = PTR_ERR(handle);
 561                 handle = NULL;
 562                 goto out;
 563         }
 564
 565         /* We cannot recurse into the filesystem as the transaction is already
 566          * started */
 567         flags |= AOP_FLAG_NOFS;
 568
 569         page = grab_cache_page_write_begin(mapping, 0, flags);
 570         if (!page) {
 571                 ret = -ENOMEM;
 572                 goto out;
 573         }
 574
 575         ext4_write_lock_xattr(inode, &no_expand);
 576         sem_held = 1;
 577         /* If some one has already done this for us, just exit. */
 578         if (!ext4_has_inline_data(inode)) {
 579                 ret = 0;
 580                 goto out;
 581         }
 582
 583         from = 0;
 584         to = ext4_get_inline_size(inode);
 585         if (!PageUptodate(page)) {
 586                 ret = ext4_read_inline_page(inode, page);
 587                 if (ret < 0)
 588                         goto out;
 589         }
 590
 591         ret = ext4_destroy_inline_data_nolock(handle, inode);
 592         if (ret)
 593                 goto out;
 594
 595         if (ext4_should_dioread_nolock(inode)) {
 596                 ret = __block_write_begin(page, from, to,
 597                                           ext4_get_block_unwritten);
 598         } else
 599                 ret = __block_write_begin(page, from, to, ext4_get_block);
 600
 601         if (!ret && ext4_should_journal_data(inode)) {
 602                 ret = ext4_walk_page_buffers(handle, page_buffers(page),
 603                                              from, to, NULL,
 604                                              do_journal_get_write_access);
 605         }
 606
 607         if (ret) {
 608                 unlock_page(page);
 609                 put_page(page);
 610                 page = NULL;
 611                 ext4_orphan_add(handle, inode);
 612                 ext4_write_unlock_xattr(inode, &no_expand);
 613                 sem_held = 0;
 614                 ext4_journal_stop(handle);
 615                 handle = NULL;
 616                 ext4_truncate_failed_write(inode);
 617                 /*
 618                  * If truncate failed early the inode might
 619                  * still be on the orphan list; we need to
 620                  * make sure the inode is removed from the
 621                  * orphan list in that case.
 622                  */
 623                 if (inode->i_nlink)
 624                         ext4_orphan_del(NULL, inode);
 625         }
 626
 627         if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 628                 goto retry;
 629
 630         if (page)
 631                 block_commit_write(page, from, to);
 632 out:
 633         if (page) {
 634                 unlock_page(page);
 635                 put_page(page);
 636         }
 637         if (sem_held)
 638                 ext4_write_unlock_xattr(inode, &no_expand);
 639         if (handle)
 640                 ext4_journal_stop(handle);
 641         brelse(iloc.bh);
 642         return ret;
 643 }
 644
 645 /*
 646  * Try to write data in the inode.
 647  * If the inode has inline data, check whether the new write can be
 648  * in the inode also. If not, create the page the handle, move the data
 649  * to the page make it update and let the later codes create extent for it.
 650  */
 651 int ext4_try_to_write_inline_data(struct address_space *mapping,
 652                                   struct inode *inode,
 653                                   loff_t pos, unsigned len,
 654                                   unsigned flags,
 655                                   struct page **pagep)
 656 {
 657         int ret;
 658         handle_t *handle;
 659         struct page *page;
 660         struct ext4_iloc iloc;
 661
 662         if (pos + len > ext4_get_max_inline_size(inode))
 663                 goto convert;
 664
 665         ret = ext4_get_inode_loc(inode, &iloc);
 666         if (ret)
 667                 return ret;
 668
 669         /*
 670          * The possible write could happen in the inode,
 671          * so try to reserve the space in inode first.
 672          */
 673         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 674         if (IS_ERR(handle)) {
 675                 ret = PTR_ERR(handle);
 676                 handle = NULL;
 677                 goto out;
 678         }
 679
 680         ret = ext4_prepare_inline_data(handle, inode, pos + len);
 681         if (ret && ret != -ENOSPC)
 682                 goto out;
 683
 684         /* We don't have space in inline inode, so convert it to extent. */
 685         if (ret == -ENOSPC) {
 686                 ext4_journal_stop(handle);
 687                 brelse(iloc.bh);
 688                 goto convert;
 689         }
 690
 691         ret = ext4_journal_get_write_access(handle, iloc.bh);
 692         if (ret)
 693                 goto out;
 694
 695         flags |= AOP_FLAG_NOFS;
 696
 697         page = grab_cache_page_write_begin(mapping, 0, flags);
 698         if (!page) {
 699                 ret = -ENOMEM;
 700                 goto out;
 701         }
 702
 703         *pagep = page;
 704         down_read(&EXT4_I(inode)->xattr_sem);
 705         if (!ext4_has_inline_data(inode)) {
 706                 ret = 0;
 707                 unlock_page(page);
 708                 put_page(page);
 709                 goto out_up_read;
 710         }
 711
 712         if (!PageUptodate(page)) {
 713                 ret = ext4_read_inline_page(inode, page);
 714                 if (ret < 0) {
 715                         unlock_page(page);
 716                         put_page(page);
 717                         goto out_up_read;
 718                 }
 719         }
 720
 721         ret = 1;
 722         handle = NULL;
 723 out_up_read:
 724         up_read(&EXT4_I(inode)->xattr_sem);
 725 out:
 726         if (handle && (ret != 1))
 727                 ext4_journal_stop(handle);
 728         brelse(iloc.bh);
 729         return ret;
 730 convert:
 731         return ext4_convert_inline_data_to_extent(mapping,
 732                                                   inode, flags);
 733 }
 734
 735 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 736                                unsigned copied, struct page *page)
 737 {
 738         int ret, no_expand;
 739         void *kaddr;
 740         struct ext4_iloc iloc;
 741
 742         if (unlikely(copied < len)) {
 743                 if (!PageUptodate(page)) {
 744                         copied = 0;
 745                         goto out;
 746                 }
 747         }
 748
 749         ret = ext4_get_inode_loc(inode, &iloc);
 750         if (ret) {
 751                 ext4_std_error(inode->i_sb, ret);
 752                 copied = 0;
 753                 goto out;
 754         }
 755
 756         ext4_write_lock_xattr(inode, &no_expand);
 757         BUG_ON(!ext4_has_inline_data(inode));
 758
 759         /*
 760          * ei->i_inline_off may have changed since ext4_write_begin()
 761          * called ext4_try_to_write_inline_data()
 762          */
 763         (void) ext4_find_inline_data_nolock(inode);
 764
 765         kaddr = kmap_atomic(page);
 766         ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
 767         kunmap_atomic(kaddr);
 768         SetPageUptodate(page);
 769         /* clear page dirty so that writepages wouldn't work for us. */
 770         ClearPageDirty(page);
 771
 772         ext4_write_unlock_xattr(inode, &no_expand);
 773         brelse(iloc.bh);
 774         mark_inode_dirty(inode);
 775 out:
 776         return copied;
 777 }
 778
 779 struct buffer_head *
 780 ext4_journalled_write_inline_data(struct inode *inode,
 781                                   unsigned len,
 782                                   struct page *page)
 783 {
 784         int ret, no_expand;
 785         void *kaddr;
 786         struct ext4_iloc iloc;
 787
 788         ret = ext4_get_inode_loc(inode, &iloc);
 789         if (ret) {
 790                 ext4_std_error(inode->i_sb, ret);
 791                 return NULL;
 792         }
 793
 794         ext4_write_lock_xattr(inode, &no_expand);
 795         kaddr = kmap_atomic(page);
 796         ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
 797         kunmap_atomic(kaddr);
 798         ext4_write_unlock_xattr(inode, &no_expand);
 799
 800         return iloc.bh;
 801 }
 802
 803 /*
 804  * Try to make the page cache and handle ready for the inline data case.
 805  * We can call this function in 2 cases:
 806  * 1. The inode is created and the first write exceeds inline size. We can
 807  *    clear the inode state safely.
 808  * 2. The inode has inline data, then we need to read the data, make it
 809  *    update and dirty so that ext4_da_writepages can handle it. We don't
 810  *    need to start the journal since the file's metatdata isn't changed now.
 811  */
 812 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 813                                                  struct inode *inode,
 814                                                  unsigned flags,
 815                                                  void **fsdata)
 816 {
 817         int ret = 0, inline_size;
 818         struct page *page;
 819
 820         page = grab_cache_page_write_begin(mapping, 0, flags);
 821         if (!page)
 822                 return -ENOMEM;
 823
 824         down_read(&EXT4_I(inode)->xattr_sem);
 825         if (!ext4_has_inline_data(inode)) {
 826                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 827                 goto out;
 828         }
 829
 830         inline_size = ext4_get_inline_size(inode);
 831
 832         if (!PageUptodate(page)) {
 833                 ret = ext4_read_inline_page(inode, page);
 834                 if (ret < 0)
 835                         goto out;
 836         }
 837
 838         ret = __block_write_begin(page, 0, inline_size,
 839                                   ext4_da_get_block_prep);
 840         if (ret) {
 841                 up_read(&EXT4_I(inode)->xattr_sem);
 842                 unlock_page(page);
 843                 put_page(page);
 844                 ext4_truncate_failed_write(inode);
 845                 return ret;
 846         }
 847
 848         SetPageDirty(page);
 849         SetPageUptodate(page);
 850         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 851         *fsdata = (void *)CONVERT_INLINE_DATA;
 852
 853 out:
 854         up_read(&EXT4_I(inode)->xattr_sem);
 855         if (page) {
 856                 unlock_page(page);
 857                 put_page(page);
 858         }
 859         return ret;
 860 }
 861
 862 /*
 863  * Prepare the write for the inline data.
 864  * If the the data can be written into the inode, we just read
 865  * the page and make it uptodate, and start the journal.
 866  * Otherwise read the page, makes it dirty so that it can be
 867  * handle in writepages(the i_disksize update is left to the
 868  * normal ext4_da_write_end).
 869  */
 870 int ext4_da_write_inline_data_begin(struct address_space *mapping,
 871                                     struct inode *inode,
 872                                     loff_t pos, unsigned len,
 873                                     unsigned flags,
 874                                     struct page **pagep,
 875                                     void **fsdata)
 876 {
 877         int ret, inline_size;
 878         handle_t *handle;
 879         struct page *page;
 880         struct ext4_iloc iloc;
 881         int retries = 0;
 882
 883         ret = ext4_get_inode_loc(inode, &iloc);
 884         if (ret)
 885                 return ret;
 886
 887 retry_journal:
 888         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 889         if (IS_ERR(handle)) {
 890                 ret = PTR_ERR(handle);
 891                 goto out;
 892         }
 893
 894         inline_size = ext4_get_max_inline_size(inode);
 895
 896         ret = -ENOSPC;
 897         if (inline_size >= pos + len) {
 898                 ret = ext4_prepare_inline_data(handle, inode, pos + len);
 899                 if (ret && ret != -ENOSPC)
 900                         goto out_journal;
 901         }
 902
 903         /*
 904          * We cannot recurse into the filesystem as the transaction
 905          * is already started.
 906          */
 907         flags |= AOP_FLAG_NOFS;
 908
 909         if (ret == -ENOSPC) {
 910                 ext4_journal_stop(handle);
 911                 ret = ext4_da_convert_inline_data_to_extent(mapping,
 912                                                             inode,
 913                                                             flags,
 914                                                             fsdata);
 915                 if (ret == -ENOSPC &&
 916                     ext4_should_retry_alloc(inode->i_sb, &retries))
 917                         goto retry_journal;
 918                 goto out;
 919         }
 920
 921         page = grab_cache_page_write_begin(mapping, 0, flags);
 922         if (!page) {
 923                 ret = -ENOMEM;
 924                 goto out_journal;
 925         }
 926
 927         down_read(&EXT4_I(inode)->xattr_sem);
 928         if (!ext4_has_inline_data(inode)) {
 929                 ret = 0;
 930                 goto out_release_page;
 931         }
 932
 933         if (!PageUptodate(page)) {
 934                 ret = ext4_read_inline_page(inode, page);
 935                 if (ret < 0)
 936                         goto out_release_page;
 937         }
 938         ret = ext4_journal_get_write_access(handle, iloc.bh);
 939         if (ret)
 940                 goto out_release_page;
 941
 942         up_read(&EXT4_I(inode)->xattr_sem);
 943         *pagep = page;
 944         brelse(iloc.bh);
 945         return 1;
 946 out_release_page:
 947         up_read(&EXT4_I(inode)->xattr_sem);
 948         unlock_page(page);
 949         put_page(page);
 950 out_journal:
 951         ext4_journal_stop(handle);
 952 out:
 953         brelse(iloc.bh);
 954         return ret;
 955 }
 956
 957 int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
 958                                   unsigned len, unsigned copied,
 959                                   struct page *page)
 960 {
 961         int ret;
 962
 963         ret = ext4_write_inline_data_end(inode, pos, len, copied, page);
 964         if (ret < 0) {
 965                 unlock_page(page);
 966                 put_page(page);
 967                 return ret;
 968         }
 969         copied = ret;
 970
 971         /*
 972          * No need to use i_size_read() here, the i_size
 973          * cannot change under us because we hold i_mutex.
 974          *
 975          * But it's important to update i_size while still holding page lock:
 976          * page writeout could otherwise come in and zero beyond i_size.
 977          */
 978         if (pos+copied > inode->i_size)
 979                 i_size_write(inode, pos+copied);
 980         unlock_page(page);
 981         put_page(page);
 982
 983         /*
 984          * Don't mark the inode dirty under page lock. First, it unnecessarily
 985          * makes the holding time of page lock longer. Second, it forces lock
 986          * ordering of page lock and transaction start for journaling
 987          * filesystems.
 988          */
 989         mark_inode_dirty(inode);
 990
 991         return copied;
 992 }
 993
 994 #ifdef INLINE_DIR_DEBUG
 995 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
 996                           void *inline_start, int inline_size)
 997 {
 998         int offset;
 999         unsigned short de_len;
1000         struct ext4_dir_entry_2 *de = inline_start;
1001         void *dlimit = inline_start + inline_size;
1002
1003         trace_printk("inode %lu\n", dir->i_ino);
1004         offset = 0;
1005         while ((void *)de < dlimit) {
1006                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
1007                 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
1008                              offset, de_len, de->name_len, de->name,
1009                              de->name_len, le32_to_cpu(de->inode));
1010                 if (ext4_check_dir_entry(dir, NULL, de, bh,
1011                                          inline_start, inline_size, offset))
1012                         BUG();
1013
1014                 offset += de_len;
1015                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
1016         }
1017 }
1018 #else
1019 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
1020 #endif
1021
1022 /*
1023  * Add a new entry into a inline dir.
1024  * It will return -ENOSPC if no space is available, and -EIO
1025  * and -EEXIST if directory entry already exists.
1026  */
1027 static int ext4_add_dirent_to_inline(handle_t *handle,
1028                                      struct ext4_filename *fname,
1029                                      struct inode *dir,
1030                                      struct inode *inode,
1031                                      struct ext4_iloc *iloc,
1032                                      void *inline_start, int inline_size)
1033 {
1034         int             err;
1035         struct ext4_dir_entry_2 *de;
1036
1037         err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1038                                 inline_size, fname, &de);
1039         if (err)
1040                 return err;
1041
1042         BUFFER_TRACE(iloc->bh, "get_write_access");
1043         err = ext4_journal_get_write_access(handle, iloc->bh);
1044         if (err)
1045                 return err;
1046         ext4_insert_dentry(inode, de, inline_size, fname);
1047
1048         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1049
1050         /*
1051          * XXX shouldn't update any times until successful
1052          * completion of syscall, but too many callers depend
1053          * on this.
1054          *
1055          * XXX similarly, too many callers depend on
1056          * ext4_new_inode() setting the times, but error
1057          * recovery deletes the inode, so the worst that can
1058          * happen is that the times are slightly out of date
1059          * and/or different from the directory change time.
1060          */
1061         dir->i_mtime = dir->i_ctime = current_time(dir);
1062         ext4_update_dx_flag(dir);
1063         dir->i_version++;
1064         return 1;
1065 }
1066
1067 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1068                                        struct ext4_iloc *iloc)
1069 {
1070         struct ext4_xattr_entry *entry;
1071         struct ext4_xattr_ibody_header *header;
1072
1073         BUG_ON(!EXT4_I(inode)->i_inline_off);
1074
1075         header = IHDR(inode, ext4_raw_inode(iloc));
1076         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1077                                             EXT4_I(inode)->i_inline_off);
1078
1079         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1080 }
1081
1082 /* Set the final de to cover the whole block. */
1083 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1084 {
1085         struct ext4_dir_entry_2 *de, *prev_de;
1086         void *limit;
1087         int de_len;
1088
1089         de = (struct ext4_dir_entry_2 *)de_buf;
1090         if (old_size) {
1091                 limit = de_buf + old_size;
1092                 do {
1093                         prev_de = de;
1094                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1095                         de_buf += de_len;
1096                         de = (struct ext4_dir_entry_2 *)de_buf;
1097                 } while (de_buf < limit);
1098
1099                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1100                                                         old_size, new_size);
1101         } else {
1102                 /* this is just created, so create an empty entry. */
1103                 de->inode = 0;
1104                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1105         }
1106 }
1107
1108 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1109                                   struct ext4_iloc *iloc)
1110 {
1111         int ret;
1112         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1113         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1114
1115         if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1116                 return -ENOSPC;
1117
1118         ret = ext4_update_inline_data(handle, dir,
1119                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1120         if (ret)
1121                 return ret;
1122
1123         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1124                              EXT4_I(dir)->i_inline_size -
1125                                                 EXT4_MIN_INLINE_DATA_SIZE);
1126         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1127         return 0;
1128 }
1129
1130 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1131                                      struct ext4_iloc *iloc,
1132                                      void *buf, int inline_size)
1133 {
1134         int ret;
1135
1136         ret = ext4_create_inline_data(handle, inode, inline_size);
1137         if (ret) {
1138                 ext4_msg(inode->i_sb, KERN_EMERG,
1139                         "error restoring inline_data for inode -- potential data loss! (inode %lu, error %d)",
1140                         inode->i_ino, ret);
1141                 return;
1142         }
1143         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1144         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1145 }
1146
1147 static int ext4_finish_convert_inline_dir(handle_t *handle,
1148                                           struct inode *inode,
1149                                           struct buffer_head *dir_block,
1150                                           void *buf,
1151                                           int inline_size)
1152 {
1153         int err, csum_size = 0, header_size = 0;
1154         struct ext4_dir_entry_2 *de;
1155         struct ext4_dir_entry_tail *t;
1156         void *target = dir_block->b_data;
1157
1158         /*
1159          * First create "." and ".." and then copy the dir information
1160          * back to the block.
1161          */
1162         de = (struct ext4_dir_entry_2 *)target;
1163         de = ext4_init_dot_dotdot(inode, de,
1164                 inode->i_sb->s_blocksize, csum_size,
1165                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1166         header_size = (void *)de - target;
1167
1168         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1169                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1170
1171         if (ext4_has_metadata_csum(inode->i_sb))
1172                 csum_size = sizeof(struct ext4_dir_entry_tail);
1173
1174         inode->i_size = inode->i_sb->s_blocksize;
1175         i_size_write(inode, inode->i_sb->s_blocksize);
1176         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1177         ext4_update_final_de(dir_block->b_data,
1178                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1179                         inode->i_sb->s_blocksize - csum_size);
1180
1181         if (csum_size) {
1182                 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1183                                      inode->i_sb->s_blocksize);
1184                 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1185         }
1186         set_buffer_uptodate(dir_block);
1187         err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1188         if (err)
1189                 return err;
1190         set_buffer_verified(dir_block);
1191         return ext4_mark_inode_dirty(handle, inode);
1192 }
1193
1194 static int ext4_convert_inline_data_nolock(handle_t *handle,
1195                                            struct inode *inode,
1196                                            struct ext4_iloc *iloc)
1197 {
1198         int error;
1199         void *buf = NULL;
1200         struct buffer_head *data_bh = NULL;
1201         struct ext4_map_blocks map;
1202         int inline_size;
1203
1204         inline_size = ext4_get_inline_size(inode);
1205         buf = kmalloc(inline_size, GFP_NOFS);
1206         if (!buf) {
1207                 error = -ENOMEM;
1208                 goto out;
1209         }
1210
1211         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1212         if (error < 0)
1213                 goto out;
1214
1215         /*
1216          * Make sure the inline directory entries pass checks before we try to
1217          * convert them, so that we avoid touching stuff that needs fsck.
1218          */
1219         if (S_ISDIR(inode->i_mode)) {
1220                 error = ext4_check_all_de(inode, iloc->bh,
1221                                         buf + EXT4_INLINE_DOTDOT_SIZE,
1222                                         inline_size - EXT4_INLINE_DOTDOT_SIZE);
1223                 if (error)
1224                         goto out;
1225         }
1226
1227         error = ext4_destroy_inline_data_nolock(handle, inode);
1228         if (error)
1229                 goto out;
1230
1231         map.m_lblk = 0;
1232         map.m_len = 1;
1233         map.m_flags = 0;
1234         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1235         if (error < 0)
1236                 goto out_restore;
1237         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1238                 error = -EIO;
1239                 goto out_restore;
1240         }
1241
1242         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1243         if (!data_bh) {
1244                 error = -ENOMEM;
1245                 goto out_restore;
1246         }
1247
1248         lock_buffer(data_bh);
1249         error = ext4_journal_get_create_access(handle, data_bh);
1250         if (error) {
1251                 unlock_buffer(data_bh);
1252                 error = -EIO;
1253                 goto out_restore;
1254         }
1255         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1256
1257         if (!S_ISDIR(inode->i_mode)) {
1258                 memcpy(data_bh->b_data, buf, inline_size);
1259                 set_buffer_uptodate(data_bh);
1260                 error = ext4_handle_dirty_metadata(handle,
1261                                                    inode, data_bh);
1262         } else {
1263                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1264                                                        buf, inline_size);
1265         }
1266
1267         unlock_buffer(data_bh);
1268 out_restore:
1269         if (error)
1270                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1271
1272 out:
1273         brelse(data_bh);
1274         kfree(buf);
1275         return error;
1276 }
1277
1278 /*
1279  * Try to add the new entry to the inline data.
1280  * If succeeds, return 0. If not, extended the inline dir and copied data to
1281  * the new created block.
1282  */
1283 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1284                               struct inode *dir, struct inode *inode)
1285 {
1286         int ret, inline_size, no_expand;
1287         void *inline_start;
1288         struct ext4_iloc iloc;
1289
1290         ret = ext4_get_inode_loc(dir, &iloc);
1291         if (ret)
1292                 return ret;
1293
1294         ext4_write_lock_xattr(dir, &no_expand);
1295         if (!ext4_has_inline_data(dir))
1296                 goto out;
1297
1298         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1299                                                  EXT4_INLINE_DOTDOT_SIZE;
1300         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1301
1302         ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1303                                         inline_start, inline_size);
1304         if (ret != -ENOSPC)
1305                 goto out;
1306
1307         /* check whether it can be inserted to inline xattr space. */
1308         inline_size = EXT4_I(dir)->i_inline_size -
1309                         EXT4_MIN_INLINE_DATA_SIZE;
1310         if (!inline_size) {
1311                 /* Try to use the xattr space.*/
1312                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1313                 if (ret && ret != -ENOSPC)
1314                         goto out;
1315
1316                 inline_size = EXT4_I(dir)->i_inline_size -
1317                                 EXT4_MIN_INLINE_DATA_SIZE;
1318         }
1319
1320         if (inline_size) {
1321                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1322
1323                 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1324                                                 inode, &iloc, inline_start,
1325                                                 inline_size);
1326
1327                 if (ret != -ENOSPC)
1328                         goto out;
1329         }
1330
1331         /*
1332          * The inline space is filled up, so create a new block for it.
1333          * As the extent tree will be created, we have to save the inline
1334          * dir first.
1335          */
1336         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1337
1338 out:
1339         ext4_write_unlock_xattr(dir, &no_expand);
1340         ext4_mark_inode_dirty(handle, dir);
1341         brelse(iloc.bh);
1342         return ret;
1343 }
1344
1345 /*
1346  * This function fills a red-black tree with information from an
1347  * inlined dir.  It returns the number directory entries loaded
1348  * into the tree.  If there is an error it is returned in err.
1349  */
1350 int htree_inlinedir_to_tree(struct file *dir_file,
1351                             struct inode *dir, ext4_lblk_t block,
1352                             struct dx_hash_info *hinfo,
1353                             __u32 start_hash, __u32 start_minor_hash,
1354                             int *has_inline_data)
1355 {
1356         int err = 0, count = 0;
1357         unsigned int parent_ino;
1358         int pos;
1359         struct ext4_dir_entry_2 *de;
1360         struct inode *inode = file_inode(dir_file);
1361         int ret, inline_size = 0;
1362         struct ext4_iloc iloc;
1363         void *dir_buf = NULL;
1364         struct ext4_dir_entry_2 fake;
1365         struct fscrypt_str tmp_str;
1366
1367         ret = ext4_get_inode_loc(inode, &iloc);
1368         if (ret)
1369                 return ret;
1370
1371         down_read(&EXT4_I(inode)->xattr_sem);
1372         if (!ext4_has_inline_data(inode)) {
1373                 up_read(&EXT4_I(inode)->xattr_sem);
1374                 *has_inline_data = 0;
1375                 goto out;
1376         }
1377
1378         inline_size = ext4_get_inline_size(inode);
1379         dir_buf = kmalloc(inline_size, GFP_NOFS);
1380         if (!dir_buf) {
1381                 ret = -ENOMEM;
1382                 up_read(&EXT4_I(inode)->xattr_sem);
1383                 goto out;
1384         }
1385
1386         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1387         up_read(&EXT4_I(inode)->xattr_sem);
1388         if (ret < 0)
1389                 goto out;
1390
1391         pos = 0;
1392         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1393         while (pos < inline_size) {
1394                 /*
1395                  * As inlined dir doesn't store any information about '.' and
1396                  * only the inode number of '..' is stored, we have to handle
1397                  * them differently.
1398                  */
1399                 if (pos == 0) {
1400                         fake.inode = cpu_to_le32(inode->i_ino);
1401                         fake.name_len = 1;
1402                         strcpy(fake.name, ".");
1403                         fake.rec_len = ext4_rec_len_to_disk(
1404                                                 EXT4_DIR_REC_LEN(fake.name_len),
1405                                                 inline_size);
1406                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1407                         de = &fake;
1408                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1409                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1410                         fake.inode = cpu_to_le32(parent_ino);
1411                         fake.name_len = 2;
1412                         strcpy(fake.name, "..");
1413                         fake.rec_len = ext4_rec_len_to_disk(
1414                                                 EXT4_DIR_REC_LEN(fake.name_len),
1415                                                 inline_size);
1416                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1417                         de = &fake;
1418                         pos = EXT4_INLINE_DOTDOT_SIZE;
1419                 } else {
1420                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1421                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1422                         if (ext4_check_dir_entry(inode, dir_file, de,
1423                                          iloc.bh, dir_buf,
1424                                          inline_size, pos)) {
1425                                 ret = count;
1426                                 goto out;
1427                         }
1428                 }
1429
1430                 ext4fs_dirhash(de->name, de->name_len, hinfo);
1431                 if ((hinfo->hash < start_hash) ||
1432                     ((hinfo->hash == start_hash) &&
1433                      (hinfo->minor_hash < start_minor_hash)))
1434                         continue;
1435                 if (de->inode == 0)
1436                         continue;
1437                 tmp_str.name = de->name;
1438                 tmp_str.len = de->name_len;
1439                 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1440                                               hinfo->minor_hash, de, &tmp_str);
1441                 if (err) {
1442                         ret = err;
1443                         goto out;
1444                 }
1445                 count++;
1446         }
1447         ret = count;
1448 out:
1449         kfree(dir_buf);
1450         brelse(iloc.bh);
1451         return ret;
1452 }
1453
1454 /*
1455  * So this function is called when the volume is mkfsed with
1456  * dir_index disabled. In order to keep f_pos persistent
1457  * after we convert from an inlined dir to a blocked based,
1458  * we just pretend that we are a normal dir and return the
1459  * offset as if '.' and '..' really take place.
1460  *
1461  */
1462 int ext4_read_inline_dir(struct file *file,
1463                          struct dir_context *ctx,
1464                          int *has_inline_data)
1465 {
1466         unsigned int offset, parent_ino;
1467         int i;
1468         struct ext4_dir_entry_2 *de;
1469         struct super_block *sb;
1470         struct inode *inode = file_inode(file);
1471         int ret, inline_size = 0;
1472         struct ext4_iloc iloc;
1473         void *dir_buf = NULL;
1474         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1475
1476         ret = ext4_get_inode_loc(inode, &iloc);
1477         if (ret)
1478                 return ret;
1479
1480         down_read(&EXT4_I(inode)->xattr_sem);
1481         if (!ext4_has_inline_data(inode)) {
1482                 up_read(&EXT4_I(inode)->xattr_sem);
1483                 *has_inline_data = 0;
1484                 goto out;
1485         }
1486
1487         inline_size = ext4_get_inline_size(inode);
1488         dir_buf = kmalloc(inline_size, GFP_NOFS);
1489         if (!dir_buf) {
1490                 ret = -ENOMEM;
1491                 up_read(&EXT4_I(inode)->xattr_sem);
1492                 goto out;
1493         }
1494
1495         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1496         up_read(&EXT4_I(inode)->xattr_sem);
1497         if (ret < 0)
1498                 goto out;
1499
1500         ret = 0;
1501         sb = inode->i_sb;
1502         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1503         offset = ctx->pos;
1504
1505         /*
1506          * dotdot_offset and dotdot_size is the real offset and
1507          * size for ".." and "." if the dir is block based while
1508          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1509          * So we will use extra_offset and extra_size to indicate them
1510          * during the inline dir iteration.
1511          */
1512         dotdot_offset = EXT4_DIR_REC_LEN(1);
1513         dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1514         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1515         extra_size = extra_offset + inline_size;
1516
1517         /*
1518          * If the version has changed since the last call to
1519          * readdir(2), then we might be pointing to an invalid
1520          * dirent right now.  Scan from the start of the inline
1521          * dir to make sure.
1522          */
1523         if (file->f_version != inode->i_version) {
1524                 for (i = 0; i < extra_size && i < offset;) {
1525                         /*
1526                          * "." is with offset 0 and
1527                          * ".." is dotdot_offset.
1528                          */
1529                         if (!i) {
1530                                 i = dotdot_offset;
1531                                 continue;
1532                         } else if (i == dotdot_offset) {
1533                                 i = dotdot_size;
1534                                 continue;
1535                         }
1536                         /* for other entry, the real offset in
1537                          * the buf has to be tuned accordingly.
1538                          */
1539                         de = (struct ext4_dir_entry_2 *)
1540                                 (dir_buf + i - extra_offset);
1541                         /* It's too expensive to do a full
1542                          * dirent test each time round this
1543                          * loop, but we do have to test at
1544                          * least that it is non-zero.  A
1545                          * failure will be detected in the
1546                          * dirent test below. */
1547                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1548                                 < EXT4_DIR_REC_LEN(1))
1549                                 break;
1550                         i += ext4_rec_len_from_disk(de->rec_len,
1551                                                     extra_size);
1552                 }
1553                 offset = i;
1554                 ctx->pos = offset;
1555                 file->f_version = inode->i_version;
1556         }
1557
1558         while (ctx->pos < extra_size) {
1559                 if (ctx->pos == 0) {
1560                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1561                                 goto out;
1562                         ctx->pos = dotdot_offset;
1563                         continue;
1564                 }
1565
1566                 if (ctx->pos == dotdot_offset) {
1567                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1568                                 goto out;
1569                         ctx->pos = dotdot_size;
1570                         continue;
1571                 }
1572
1573                 de = (struct ext4_dir_entry_2 *)
1574                         (dir_buf + ctx->pos - extra_offset);
1575                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1576                                          extra_size, ctx->pos))
1577                         goto out;
1578                 if (le32_to_cpu(de->inode)) {
1579                         if (!dir_emit(ctx, de->name, de->name_len,
1580                                       le32_to_cpu(de->inode),
1581                                       get_dtype(sb, de->file_type)))
1582                                 goto out;
1583                 }
1584                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1585         }
1586 out:
1587         kfree(dir_buf);
1588         brelse(iloc.bh);
1589         return ret;
1590 }
1591
1592 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1593                                         struct ext4_dir_entry_2 **parent_de,
1594                                         int *retval)
1595 {
1596         struct ext4_iloc iloc;
1597
1598         *retval = ext4_get_inode_loc(inode, &iloc);
1599         if (*retval)
1600                 return NULL;
1601
1602         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1603
1604         return iloc.bh;
1605 }
1606
1607 /*
1608  * Try to create the inline data for the new dir.
1609  * If it succeeds, return 0, otherwise return the error.
1610  * In case of ENOSPC, the caller should create the normal disk layout dir.
1611  */
1612 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1613                                struct inode *inode)
1614 {
1615         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1616         struct ext4_iloc iloc;
1617         struct ext4_dir_entry_2 *de;
1618
1619         ret = ext4_get_inode_loc(inode, &iloc);
1620         if (ret)
1621                 return ret;
1622
1623         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1624         if (ret)
1625                 goto out;
1626
1627         /*
1628          * For inline dir, we only save the inode information for the ".."
1629          * and create a fake dentry to cover the left space.
1630          */
1631         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1632         de->inode = cpu_to_le32(parent->i_ino);
1633         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1634         de->inode = 0;
1635         de->rec_len = ext4_rec_len_to_disk(
1636                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1637                                 inline_size);
1638         set_nlink(inode, 2);
1639         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1640 out:
1641         brelse(iloc.bh);
1642         return ret;
1643 }
1644
1645 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1646                                         struct ext4_filename *fname,
1647                                         struct ext4_dir_entry_2 **res_dir,
1648                                         int *has_inline_data)
1649 {
1650         int ret;
1651         struct ext4_iloc iloc;
1652         void *inline_start;
1653         int inline_size;
1654
1655         if (ext4_get_inode_loc(dir, &iloc))
1656                 return NULL;
1657
1658         down_read(&EXT4_I(dir)->xattr_sem);
1659         if (!ext4_has_inline_data(dir)) {
1660                 *has_inline_data = 0;
1661                 goto out;
1662         }
1663
1664         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1665                                                 EXT4_INLINE_DOTDOT_SIZE;
1666         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1667         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1668                               dir, fname, 0, res_dir);
1669         if (ret == 1)
1670                 goto out_find;
1671         if (ret < 0)
1672                 goto out;
1673
1674         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1675                 goto out;
1676
1677         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1678         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1679
1680         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1681                               dir, fname, 0, res_dir);
1682         if (ret == 1)
1683                 goto out_find;
1684
1685 out:
1686         brelse(iloc.bh);
1687         iloc.bh = NULL;
1688 out_find:
1689         up_read(&EXT4_I(dir)->xattr_sem);
1690         return iloc.bh;
1691 }
1692
1693 int ext4_delete_inline_entry(handle_t *handle,
1694                              struct inode *dir,
1695                              struct ext4_dir_entry_2 *de_del,
1696                              struct buffer_head *bh,
1697                              int *has_inline_data)
1698 {
1699         int err, inline_size, no_expand;
1700         struct ext4_iloc iloc;
1701         void *inline_start;
1702
1703         err = ext4_get_inode_loc(dir, &iloc);
1704         if (err)
1705                 return err;
1706
1707         ext4_write_lock_xattr(dir, &no_expand);
1708         if (!ext4_has_inline_data(dir)) {
1709                 *has_inline_data = 0;
1710                 goto out;
1711         }
1712
1713         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1714                 EXT4_MIN_INLINE_DATA_SIZE) {
1715                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1716                                         EXT4_INLINE_DOTDOT_SIZE;
1717                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1718                                 EXT4_INLINE_DOTDOT_SIZE;
1719         } else {
1720                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1721                 inline_size = ext4_get_inline_size(dir) -
1722                                 EXT4_MIN_INLINE_DATA_SIZE;
1723         }
1724
1725         BUFFER_TRACE(bh, "get_write_access");
1726         err = ext4_journal_get_write_access(handle, bh);
1727         if (err)
1728                 goto out;
1729
1730         err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1731                                         inline_start, inline_size, 0);
1732         if (err)
1733                 goto out;
1734
1735         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1736 out:
1737         ext4_write_unlock_xattr(dir, &no_expand);
1738         if (likely(err == 0))
1739                 err = ext4_mark_inode_dirty(handle, dir);
1740         brelse(iloc.bh);
1741         if (err != -ENOENT)
1742                 ext4_std_error(dir->i_sb, err);
1743         return err;
1744 }
1745
1746 /*
1747  * Get the inline dentry at offset.
1748  */
1749 static inline struct ext4_dir_entry_2 *
1750 ext4_get_inline_entry(struct inode *inode,
1751                       struct ext4_iloc *iloc,
1752                       unsigned int offset,
1753                       void **inline_start,
1754                       int *inline_size)
1755 {
1756         void *inline_pos;
1757
1758         BUG_ON(offset > ext4_get_inline_size(inode));
1759
1760         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1761                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1762                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1763         } else {
1764                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1765                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1766                 *inline_size = ext4_get_inline_size(inode) -
1767                                 EXT4_MIN_INLINE_DATA_SIZE;
1768         }
1769
1770         if (inline_start)
1771                 *inline_start = inline_pos;
1772         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1773 }
1774
1775 bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1776 {
1777         int err, inline_size;
1778         struct ext4_iloc iloc;
1779         size_t inline_len;
1780         void *inline_pos;
1781         unsigned int offset;
1782         struct ext4_dir_entry_2 *de;
1783         bool ret = true;
1784
1785         err = ext4_get_inode_loc(dir, &iloc);
1786         if (err) {
1787                 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1788                                  err, dir->i_ino);
1789                 return true;
1790         }
1791
1792         down_read(&EXT4_I(dir)->xattr_sem);
1793         if (!ext4_has_inline_data(dir)) {
1794                 *has_inline_data = 0;
1795                 goto out;
1796         }
1797
1798         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1799         if (!le32_to_cpu(de->inode)) {
1800                 ext4_warning(dir->i_sb,
1801                              "bad inline directory (dir #%lu) - no `..'",
1802                              dir->i_ino);
1803                 ret = true;
1804                 goto out;
1805         }
1806
1807         inline_len = ext4_get_inline_size(dir);
1808         offset = EXT4_INLINE_DOTDOT_SIZE;
1809         while (offset < inline_len) {
1810                 de = ext4_get_inline_entry(dir, &iloc, offset,
1811                                            &inline_pos, &inline_size);
1812                 if (ext4_check_dir_entry(dir, NULL, de,
1813                                          iloc.bh, inline_pos,
1814                                          inline_size, offset)) {
1815                         ext4_warning(dir->i_sb,
1816                                      "bad inline directory (dir #%lu) - "
1817                                      "inode %u, rec_len %u, name_len %d"
1818                                      "inline size %d",
1819                                      dir->i_ino, le32_to_cpu(de->inode),
1820                                      le16_to_cpu(de->rec_len), de->name_len,
1821                                      inline_size);
1822                         ret = true;
1823                         goto out;
1824                 }
1825                 if (le32_to_cpu(de->inode)) {
1826                         ret = false;
1827                         goto out;
1828                 }
1829                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1830         }
1831
1832 out:
1833         up_read(&EXT4_I(dir)->xattr_sem);
1834         brelse(iloc.bh);
1835         return ret;
1836 }
1837
1838 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1839 {
1840         int ret, no_expand;
1841
1842         ext4_write_lock_xattr(inode, &no_expand);
1843         ret = ext4_destroy_inline_data_nolock(handle, inode);
1844         ext4_write_unlock_xattr(inode, &no_expand);
1845
1846         return ret;
1847 }
1848
1849 int ext4_inline_data_fiemap(struct inode *inode,
1850                             struct fiemap_extent_info *fieinfo,
1851                             int *has_inline, __u64 start, __u64 len)
1852 {
1853         __u64 physical = 0;
1854         __u64 inline_len;
1855         __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
1856                 FIEMAP_EXTENT_LAST;
1857         int error = 0;
1858         struct ext4_iloc iloc;
1859
1860         down_read(&EXT4_I(inode)->xattr_sem);
1861         if (!ext4_has_inline_data(inode)) {
1862                 *has_inline = 0;
1863                 goto out;
1864         }
1865         inline_len = min_t(size_t, ext4_get_inline_size(inode),
1866                            i_size_read(inode));
1867         if (start >= inline_len)
1868                 goto out;
1869         if (start + len < inline_len)
1870                 inline_len = start + len;
1871         inline_len -= start;
1872
1873         error = ext4_get_inode_loc(inode, &iloc);
1874         if (error)
1875                 goto out;
1876
1877         physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1878         physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1879         physical += offsetof(struct ext4_inode, i_block);
1880
1881         brelse(iloc.bh);
1882 out:
1883         up_read(&EXT4_I(inode)->xattr_sem);
1884         if (physical)
1885                 error = fiemap_fill_next_extent(fieinfo, start, physical,
1886                                                 inline_len, flags);
1887         return (error < 0 ? error : 0);
1888 }
1889
1890 int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1891 {
1892         handle_t *handle;
1893         int inline_size, value_len, needed_blocks, no_expand, err = 0;
1894         size_t i_size;
1895         void *value = NULL;
1896         struct ext4_xattr_ibody_find is = {
1897                 .s = { .not_found = -ENODATA, },
1898         };
1899         struct ext4_xattr_info i = {
1900                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1901                 .name = EXT4_XATTR_SYSTEM_DATA,
1902         };
1903
1904
1905         needed_blocks = ext4_writepage_trans_blocks(inode);
1906         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1907         if (IS_ERR(handle))
1908                 return PTR_ERR(handle);
1909
1910         ext4_write_lock_xattr(inode, &no_expand);
1911         if (!ext4_has_inline_data(inode)) {
1912                 ext4_write_unlock_xattr(inode, &no_expand);
1913                 *has_inline = 0;
1914                 ext4_journal_stop(handle);
1915                 return 0;
1916         }
1917
1918         if ((err = ext4_orphan_add(handle, inode)) != 0)
1919                 goto out;
1920
1921         if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1922                 goto out;
1923
1924         down_write(&EXT4_I(inode)->i_data_sem);
1925         i_size = inode->i_size;
1926         inline_size = ext4_get_inline_size(inode);
1927         EXT4_I(inode)->i_disksize = i_size;
1928
1929         if (i_size < inline_size) {
1930                 /* Clear the content in the xattr space. */
1931                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1932                         if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1933                                 goto out_error;
1934
1935                         BUG_ON(is.s.not_found);
1936
1937                         value_len = le32_to_cpu(is.s.here->e_value_size);
1938                         value = kmalloc(value_len, GFP_NOFS);
1939                         if (!value) {
1940                                 err = -ENOMEM;
1941                                 goto out_error;
1942                         }
1943
1944                         err = ext4_xattr_ibody_get(inode, i.name_index,
1945                                                    i.name, value, value_len);
1946                         if (err <= 0)
1947                                 goto out_error;
1948
1949                         i.value = value;
1950                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1951                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1952                         err = ext4_xattr_ibody_inline_set(handle, inode,
1953                                                           &i, &is);
1954                         if (err)
1955                                 goto out_error;
1956                 }
1957
1958                 /* Clear the content within i_blocks. */
1959                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1960                         void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1961                         memset(p + i_size, 0,
1962                                EXT4_MIN_INLINE_DATA_SIZE - i_size);
1963                 }
1964
1965                 EXT4_I(inode)->i_inline_size = i_size <
1966                                         EXT4_MIN_INLINE_DATA_SIZE ?
1967                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
1968         }
1969
1970 out_error:
1971         up_write(&EXT4_I(inode)->i_data_sem);
1972 out:
1973         brelse(is.iloc.bh);
1974         ext4_write_unlock_xattr(inode, &no_expand);
1975         kfree(value);
1976         if (inode->i_nlink)
1977                 ext4_orphan_del(handle, inode);
1978
1979         if (err == 0) {
1980                 inode->i_mtime = inode->i_ctime = current_time(inode);
1981                 err = ext4_mark_inode_dirty(handle, inode);
1982                 if (IS_SYNC(inode))
1983                         ext4_handle_sync(handle);
1984         }
1985         ext4_journal_stop(handle);
1986         return err;
1987 }
1988
1989 int ext4_convert_inline_data(struct inode *inode)
1990 {
1991         int error, needed_blocks, no_expand;
1992         handle_t *handle;
1993         struct ext4_iloc iloc;
1994
1995         if (!ext4_has_inline_data(inode)) {
1996                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1997                 return 0;
1998         } else if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
1999                 /*
2000                  * Inode has inline data but EXT4_STATE_MAY_INLINE_DATA is
2001                  * cleared. This means we are in the middle of moving of
2002                  * inline data to delay allocated block. Just force writeout
2003                  * here to finish conversion.
2004                  */
2005                 error = filemap_flush(inode->i_mapping);
2006                 if (error)
2007                         return error;
2008                 if (!ext4_has_inline_data(inode))
2009                         return 0;
2010         }
2011
2012         needed_blocks = ext4_writepage_trans_blocks(inode);
2013
2014         iloc.bh = NULL;
2015         error = ext4_get_inode_loc(inode, &iloc);
2016         if (error)
2017                 return error;
2018
2019         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2020         if (IS_ERR(handle)) {
2021                 error = PTR_ERR(handle);
2022                 goto out_free;
2023         }
2024
2025         ext4_write_lock_xattr(inode, &no_expand);
2026         if (ext4_has_inline_data(inode))
2027                 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2028         ext4_write_unlock_xattr(inode, &no_expand);
2029         ext4_journal_stop(handle);
2030 out_free:
2031         brelse(iloc.bh);
2032         return error;
2033 }