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_block && 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                 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 154                                         (void *)ext4_raw_inode(&is.iloc));
 155                 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 156                                 le32_to_cpu(is.s.here->e_value_size);
 157                 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 158         }
 159 out:
 160         brelse(is.iloc.bh);
 161         return error;
 162 }
 163
 164 static int ext4_read_inline_data(struct inode *inode, void *buffer,
 165                                  unsigned int len,
 166                                  struct ext4_iloc *iloc)
 167 {
 168         struct ext4_xattr_entry *entry;
 169         struct ext4_xattr_ibody_header *header;
 170         int cp_len = 0;
 171         struct ext4_inode *raw_inode;
 172
 173         if (!len)
 174                 return 0;
 175
 176         BUG_ON(len > EXT4_I(inode)->i_inline_size);
 177
 178         cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
 179                         len : EXT4_MIN_INLINE_DATA_SIZE;
 180
 181         raw_inode = ext4_raw_inode(iloc);
 182         memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
 183
 184         len -= cp_len;
 185         buffer += cp_len;
 186
 187         if (!len)
 188                 goto out;
 189
 190         header = IHDR(inode, raw_inode);
 191         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 192                                             EXT4_I(inode)->i_inline_off);
 193         len = min_t(unsigned int, len,
 194                     (unsigned int)le32_to_cpu(entry->e_value_size));
 195
 196         memcpy(buffer,
 197                (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
 198         cp_len += len;
 199
 200 out:
 201         return cp_len;
 202 }
 203
 204 /*
 205  * write the buffer to the inline inode.
 206  * If 'create' is set, we don't need to do the extra copy in the xattr
 207  * value since it is already handled by ext4_xattr_ibody_inline_set.
 208  * That saves us one memcpy.
 209  */
 210 static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
 211                                    void *buffer, loff_t pos, unsigned int len)
 212 {
 213         struct ext4_xattr_entry *entry;
 214         struct ext4_xattr_ibody_header *header;
 215         struct ext4_inode *raw_inode;
 216         int cp_len = 0;
 217
 218         BUG_ON(!EXT4_I(inode)->i_inline_off);
 219         BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
 220
 221         raw_inode = ext4_raw_inode(iloc);
 222         buffer += pos;
 223
 224         if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
 225                 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
 226                          EXT4_MIN_INLINE_DATA_SIZE - pos : len;
 227                 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
 228
 229                 len -= cp_len;
 230                 buffer += cp_len;
 231                 pos += cp_len;
 232         }
 233
 234         if (!len)
 235                 return;
 236
 237         pos -= EXT4_MIN_INLINE_DATA_SIZE;
 238         header = IHDR(inode, raw_inode);
 239         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 240                                             EXT4_I(inode)->i_inline_off);
 241
 242         memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
 243                buffer, len);
 244 }
 245
 246 static int ext4_create_inline_data(handle_t *handle,
 247                                    struct inode *inode, unsigned len)
 248 {
 249         int error;
 250         void *value = NULL;
 251         struct ext4_xattr_ibody_find is = {
 252                 .s = { .not_found = -ENODATA, },
 253         };
 254         struct ext4_xattr_info i = {
 255                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 256                 .name = EXT4_XATTR_SYSTEM_DATA,
 257         };
 258
 259         error = ext4_get_inode_loc(inode, &is.iloc);
 260         if (error)
 261                 return error;
 262
 263         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 264         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 265         if (error)
 266                 goto out;
 267
 268         if (len > EXT4_MIN_INLINE_DATA_SIZE) {
 269                 value = EXT4_ZERO_XATTR_VALUE;
 270                 len -= EXT4_MIN_INLINE_DATA_SIZE;
 271         } else {
 272                 value = "";
 273                 len = 0;
 274         }
 275
 276         /* Insert the the xttr entry. */
 277         i.value = value;
 278         i.value_len = len;
 279
 280         error = ext4_xattr_ibody_find(inode, &i, &is);
 281         if (error)
 282                 goto out;
 283
 284         BUG_ON(!is.s.not_found);
 285
 286         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 287         if (error) {
 288                 if (error == -ENOSPC)
 289                         ext4_clear_inode_state(inode,
 290                                                EXT4_STATE_MAY_INLINE_DATA);
 291                 goto out;
 292         }
 293
 294         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 295                 0, EXT4_MIN_INLINE_DATA_SIZE);
 296
 297         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 298                                       (void *)ext4_raw_inode(&is.iloc));
 299         EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
 300         ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
 301         ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 302         get_bh(is.iloc.bh);
 303         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 304
 305 out:
 306         brelse(is.iloc.bh);
 307         return error;
 308 }
 309
 310 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
 311                                    unsigned int len)
 312 {
 313         int error;
 314         void *value = NULL;
 315         struct ext4_xattr_ibody_find is = {
 316                 .s = { .not_found = -ENODATA, },
 317         };
 318         struct ext4_xattr_info i = {
 319                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 320                 .name = EXT4_XATTR_SYSTEM_DATA,
 321         };
 322
 323         /* If the old space is ok, write the data directly. */
 324         if (len <= EXT4_I(inode)->i_inline_size)
 325                 return 0;
 326
 327         error = ext4_get_inode_loc(inode, &is.iloc);
 328         if (error)
 329                 return error;
 330
 331         error = ext4_xattr_ibody_find(inode, &i, &is);
 332         if (error)
 333                 goto out;
 334
 335         BUG_ON(is.s.not_found);
 336
 337         len -= EXT4_MIN_INLINE_DATA_SIZE;
 338         value = kzalloc(len, GFP_NOFS);
 339         if (!value)
 340                 goto out;
 341
 342         error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
 343                                      value, len);
 344         if (error == -ENODATA)
 345                 goto out;
 346
 347         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 348         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 349         if (error)
 350                 goto out;
 351
 352         /* Update the xttr entry. */
 353         i.value = value;
 354         i.value_len = len;
 355
 356         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 357         if (error)
 358                 goto out;
 359
 360         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 361                                       (void *)ext4_raw_inode(&is.iloc));
 362         EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 363                                 le32_to_cpu(is.s.here->e_value_size);
 364         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 365         get_bh(is.iloc.bh);
 366         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 367
 368 out:
 369         kfree(value);
 370         brelse(is.iloc.bh);
 371         return error;
 372 }
 373
 374 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
 375                                     unsigned int len)
 376 {
 377         int ret, size;
 378         struct ext4_inode_info *ei = EXT4_I(inode);
 379
 380         if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
 381                 return -ENOSPC;
 382
 383         size = ext4_get_max_inline_size(inode);
 384         if (size < len)
 385                 return -ENOSPC;
 386
 387         down_write(&EXT4_I(inode)->xattr_sem);
 388
 389         if (ei->i_inline_off)
 390                 ret = ext4_update_inline_data(handle, inode, len);
 391         else
 392                 ret = ext4_create_inline_data(handle, inode, len);
 393
 394         up_write(&EXT4_I(inode)->xattr_sem);
 395
 396         return ret;
 397 }
 398
 399 static int ext4_destroy_inline_data_nolock(handle_t *handle,
 400                                            struct inode *inode)
 401 {
 402         struct ext4_inode_info *ei = EXT4_I(inode);
 403         struct ext4_xattr_ibody_find is = {
 404                 .s = { .not_found = 0, },
 405         };
 406         struct ext4_xattr_info i = {
 407                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 408                 .name = EXT4_XATTR_SYSTEM_DATA,
 409                 .value = NULL,
 410                 .value_len = 0,
 411         };
 412         int error;
 413
 414         if (!ei->i_inline_off)
 415                 return 0;
 416
 417         error = ext4_get_inode_loc(inode, &is.iloc);
 418         if (error)
 419                 return error;
 420
 421         error = ext4_xattr_ibody_find(inode, &i, &is);
 422         if (error)
 423                 goto out;
 424
 425         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 426         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 427         if (error)
 428                 goto out;
 429
 430         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 431         if (error)
 432                 goto out;
 433
 434         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 435                 0, EXT4_MIN_INLINE_DATA_SIZE);
 436
 437         if (EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb,
 438                                       EXT4_FEATURE_INCOMPAT_EXTENTS)) {
 439                 if (S_ISDIR(inode->i_mode) ||
 440                     S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
 441                         ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
 442                         ext4_ext_tree_init(handle, inode);
 443                 }
 444         }
 445         ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 446
 447         get_bh(is.iloc.bh);
 448         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 449
 450         EXT4_I(inode)->i_inline_off = 0;
 451         EXT4_I(inode)->i_inline_size = 0;
 452         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 453 out:
 454         brelse(is.iloc.bh);
 455         if (error == -ENODATA)
 456                 error = 0;
 457         return error;
 458 }
 459
 460 static int ext4_read_inline_page(struct inode *inode, struct page *page)
 461 {
 462         void *kaddr;
 463         int ret = 0;
 464         size_t len;
 465         struct ext4_iloc iloc;
 466
 467         BUG_ON(!PageLocked(page));
 468         BUG_ON(!ext4_has_inline_data(inode));
 469         BUG_ON(page->index);
 470
 471         if (!EXT4_I(inode)->i_inline_off) {
 472                 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
 473                              inode->i_ino);
 474                 goto out;
 475         }
 476
 477         ret = ext4_get_inode_loc(inode, &iloc);
 478         if (ret)
 479                 goto out;
 480
 481         len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
 482         kaddr = kmap_atomic(page);
 483         ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
 484         flush_dcache_page(page);
 485         kunmap_atomic(kaddr);
 486         zero_user_segment(page, len, PAGE_CACHE_SIZE);
 487         SetPageUptodate(page);
 488         brelse(iloc.bh);
 489
 490 out:
 491         return ret;
 492 }
 493
 494 int ext4_readpage_inline(struct inode *inode, struct page *page)
 495 {
 496         int ret = 0;
 497
 498         down_read(&EXT4_I(inode)->xattr_sem);
 499         if (!ext4_has_inline_data(inode)) {
 500                 up_read(&EXT4_I(inode)->xattr_sem);
 501                 return -EAGAIN;
 502         }
 503
 504         /*
 505          * Current inline data can only exist in the 1st page,
 506          * So for all the other pages, just set them uptodate.
 507          */
 508         if (!page->index)
 509                 ret = ext4_read_inline_page(inode, page);
 510         else if (!PageUptodate(page)) {
 511                 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
 512                 SetPageUptodate(page);
 513         }
 514
 515         up_read(&EXT4_I(inode)->xattr_sem);
 516
 517         unlock_page(page);
 518         return ret >= 0 ? 0 : ret;
 519 }
 520
 521 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
 522                                               struct inode *inode,
 523                                               unsigned flags)
 524 {
 525         int ret, needed_blocks;
 526         handle_t *handle = NULL;
 527         int retries = 0, sem_held = 0;
 528         struct page *page = NULL;
 529         unsigned from, to;
 530         struct ext4_iloc iloc;
 531
 532         if (!ext4_has_inline_data(inode)) {
 533                 /*
 534                  * clear the flag so that no new write
 535                  * will trap here again.
 536                  */
 537                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 538                 return 0;
 539         }
 540
 541         needed_blocks = ext4_writepage_trans_blocks(inode);
 542
 543         ret = ext4_get_inode_loc(inode, &iloc);
 544         if (ret)
 545                 return ret;
 546
 547 retry:
 548         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
 549         if (IS_ERR(handle)) {
 550                 ret = PTR_ERR(handle);
 551                 handle = NULL;
 552                 goto out;
 553         }
 554
 555         /* We cannot recurse into the filesystem as the transaction is already
 556          * started */
 557         flags |= AOP_FLAG_NOFS;
 558
 559         page = grab_cache_page_write_begin(mapping, 0, flags);
 560         if (!page) {
 561                 ret = -ENOMEM;
 562                 goto out;
 563         }
 564
 565         down_write(&EXT4_I(inode)->xattr_sem);
 566         sem_held = 1;
 567         /* If some one has already done this for us, just exit. */
 568         if (!ext4_has_inline_data(inode)) {
 569                 ret = 0;
 570                 goto out;
 571         }
 572
 573         from = 0;
 574         to = ext4_get_inline_size(inode);
 575         if (!PageUptodate(page)) {
 576                 ret = ext4_read_inline_page(inode, page);
 577                 if (ret < 0)
 578                         goto out;
 579         }
 580
 581         ret = ext4_destroy_inline_data_nolock(handle, inode);
 582         if (ret)
 583                 goto out;
 584
 585         if (ext4_should_dioread_nolock(inode))
 586                 ret = __block_write_begin(page, from, to, ext4_get_block_write);
 587         else
 588                 ret = __block_write_begin(page, from, to, ext4_get_block);
 589
 590         if (!ret && ext4_should_journal_data(inode)) {
 591                 ret = ext4_walk_page_buffers(handle, page_buffers(page),
 592                                              from, to, NULL,
 593                                              do_journal_get_write_access);
 594         }
 595
 596         if (ret) {
 597                 unlock_page(page);
 598                 page_cache_release(page);
 599                 page = NULL;
 600                 ext4_orphan_add(handle, inode);
 601                 up_write(&EXT4_I(inode)->xattr_sem);
 602                 sem_held = 0;
 603                 ext4_journal_stop(handle);
 604                 handle = NULL;
 605                 ext4_truncate_failed_write(inode);
 606                 /*
 607                  * If truncate failed early the inode might
 608                  * still be on the orphan list; we need to
 609                  * make sure the inode is removed from the
 610                  * orphan list in that case.
 611                  */
 612                 if (inode->i_nlink)
 613                         ext4_orphan_del(NULL, inode);
 614         }
 615
 616         if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 617                 goto retry;
 618
 619         if (page)
 620                 block_commit_write(page, from, to);
 621 out:
 622         if (page) {
 623                 unlock_page(page);
 624                 page_cache_release(page);
 625         }
 626         if (sem_held)
 627                 up_write(&EXT4_I(inode)->xattr_sem);
 628         if (handle)
 629                 ext4_journal_stop(handle);
 630         brelse(iloc.bh);
 631         return ret;
 632 }
 633
 634 /*
 635  * Try to write data in the inode.
 636  * If the inode has inline data, check whether the new write can be
 637  * in the inode also. If not, create the page the handle, move the data
 638  * to the page make it update and let the later codes create extent for it.
 639  */
 640 int ext4_try_to_write_inline_data(struct address_space *mapping,
 641                                   struct inode *inode,
 642                                   loff_t pos, unsigned len,
 643                                   unsigned flags,
 644                                   struct page **pagep)
 645 {
 646         int ret;
 647         handle_t *handle;
 648         struct page *page;
 649         struct ext4_iloc iloc;
 650
 651         if (pos + len > ext4_get_max_inline_size(inode))
 652                 goto convert;
 653
 654         ret = ext4_get_inode_loc(inode, &iloc);
 655         if (ret)
 656                 return ret;
 657
 658         /*
 659          * The possible write could happen in the inode,
 660          * so try to reserve the space in inode first.
 661          */
 662         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 663         if (IS_ERR(handle)) {
 664                 ret = PTR_ERR(handle);
 665                 handle = NULL;
 666                 goto out;
 667         }
 668
 669         ret = ext4_prepare_inline_data(handle, inode, pos + len);
 670         if (ret && ret != -ENOSPC)
 671                 goto out;
 672
 673         /* We don't have space in inline inode, so convert it to extent. */
 674         if (ret == -ENOSPC) {
 675                 ext4_journal_stop(handle);
 676                 brelse(iloc.bh);
 677                 goto convert;
 678         }
 679
 680         flags |= AOP_FLAG_NOFS;
 681
 682         page = grab_cache_page_write_begin(mapping, 0, flags);
 683         if (!page) {
 684                 ret = -ENOMEM;
 685                 goto out;
 686         }
 687
 688         *pagep = page;
 689         down_read(&EXT4_I(inode)->xattr_sem);
 690         if (!ext4_has_inline_data(inode)) {
 691                 ret = 0;
 692                 unlock_page(page);
 693                 page_cache_release(page);
 694                 goto out_up_read;
 695         }
 696
 697         if (!PageUptodate(page)) {
 698                 ret = ext4_read_inline_page(inode, page);
 699                 if (ret < 0)
 700                         goto out_up_read;
 701         }
 702
 703         ret = 1;
 704         handle = NULL;
 705 out_up_read:
 706         up_read(&EXT4_I(inode)->xattr_sem);
 707 out:
 708         if (handle)
 709                 ext4_journal_stop(handle);
 710         brelse(iloc.bh);
 711         return ret;
 712 convert:
 713         return ext4_convert_inline_data_to_extent(mapping,
 714                                                   inode, flags);
 715 }
 716
 717 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 718                                unsigned copied, struct page *page)
 719 {
 720         int ret;
 721         void *kaddr;
 722         struct ext4_iloc iloc;
 723
 724         if (unlikely(copied < len)) {
 725                 if (!PageUptodate(page)) {
 726                         copied = 0;
 727                         goto out;
 728                 }
 729         }
 730
 731         ret = ext4_get_inode_loc(inode, &iloc);
 732         if (ret) {
 733                 ext4_std_error(inode->i_sb, ret);
 734                 copied = 0;
 735                 goto out;
 736         }
 737
 738         down_write(&EXT4_I(inode)->xattr_sem);
 739         BUG_ON(!ext4_has_inline_data(inode));
 740
 741         kaddr = kmap_atomic(page);
 742         ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
 743         kunmap_atomic(kaddr);
 744         SetPageUptodate(page);
 745         /* clear page dirty so that writepages wouldn't work for us. */
 746         ClearPageDirty(page);
 747
 748         up_write(&EXT4_I(inode)->xattr_sem);
 749         brelse(iloc.bh);
 750 out:
 751         return copied;
 752 }
 753
 754 struct buffer_head *
 755 ext4_journalled_write_inline_data(struct inode *inode,
 756                                   unsigned len,
 757                                   struct page *page)
 758 {
 759         int ret;
 760         void *kaddr;
 761         struct ext4_iloc iloc;
 762
 763         ret = ext4_get_inode_loc(inode, &iloc);
 764         if (ret) {
 765                 ext4_std_error(inode->i_sb, ret);
 766                 return NULL;
 767         }
 768
 769         down_write(&EXT4_I(inode)->xattr_sem);
 770         kaddr = kmap_atomic(page);
 771         ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
 772         kunmap_atomic(kaddr);
 773         up_write(&EXT4_I(inode)->xattr_sem);
 774
 775         return iloc.bh;
 776 }
 777
 778 /*
 779  * Try to make the page cache and handle ready for the inline data case.
 780  * We can call this function in 2 cases:
 781  * 1. The inode is created and the first write exceeds inline size. We can
 782  *    clear the inode state safely.
 783  * 2. The inode has inline data, then we need to read the data, make it
 784  *    update and dirty so that ext4_da_writepages can handle it. We don't
 785  *    need to start the journal since the file's metatdata isn't changed now.
 786  */
 787 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 788                                                  struct inode *inode,
 789                                                  unsigned flags,
 790                                                  void **fsdata)
 791 {
 792         int ret = 0, inline_size;
 793         struct page *page;
 794
 795         page = grab_cache_page_write_begin(mapping, 0, flags);
 796         if (!page)
 797                 return -ENOMEM;
 798
 799         down_read(&EXT4_I(inode)->xattr_sem);
 800         if (!ext4_has_inline_data(inode)) {
 801                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 802                 goto out;
 803         }
 804
 805         inline_size = ext4_get_inline_size(inode);
 806
 807         if (!PageUptodate(page)) {
 808                 ret = ext4_read_inline_page(inode, page);
 809                 if (ret < 0)
 810                         goto out;
 811         }
 812
 813         ret = __block_write_begin(page, 0, inline_size,
 814                                   ext4_da_get_block_prep);
 815         if (ret) {
 816                 up_read(&EXT4_I(inode)->xattr_sem);
 817                 unlock_page(page);
 818                 page_cache_release(page);
 819                 ext4_truncate_failed_write(inode);
 820                 return ret;
 821         }
 822
 823         SetPageDirty(page);
 824         SetPageUptodate(page);
 825         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 826         *fsdata = (void *)CONVERT_INLINE_DATA;
 827
 828 out:
 829         up_read(&EXT4_I(inode)->xattr_sem);
 830         if (page) {
 831                 unlock_page(page);
 832                 page_cache_release(page);
 833         }
 834         return ret;
 835 }
 836
 837 /*
 838  * Prepare the write for the inline data.
 839  * If the the data can be written into the inode, we just read
 840  * the page and make it uptodate, and start the journal.
 841  * Otherwise read the page, makes it dirty so that it can be
 842  * handle in writepages(the i_disksize update is left to the
 843  * normal ext4_da_write_end).
 844  */
 845 int ext4_da_write_inline_data_begin(struct address_space *mapping,
 846                                     struct inode *inode,
 847                                     loff_t pos, unsigned len,
 848                                     unsigned flags,
 849                                     struct page **pagep,
 850                                     void **fsdata)
 851 {
 852         int ret, inline_size;
 853         handle_t *handle;
 854         struct page *page;
 855         struct ext4_iloc iloc;
 856         int retries;
 857
 858         ret = ext4_get_inode_loc(inode, &iloc);
 859         if (ret)
 860                 return ret;
 861
 862 retry_journal:
 863         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 864         if (IS_ERR(handle)) {
 865                 ret = PTR_ERR(handle);
 866                 goto out;
 867         }
 868
 869         inline_size = ext4_get_max_inline_size(inode);
 870
 871         ret = -ENOSPC;
 872         if (inline_size >= pos + len) {
 873                 ret = ext4_prepare_inline_data(handle, inode, pos + len);
 874                 if (ret && ret != -ENOSPC)
 875                         goto out_journal;
 876         }
 877
 878         /*
 879          * We cannot recurse into the filesystem as the transaction
 880          * is already started.
 881          */
 882         flags |= AOP_FLAG_NOFS;
 883
 884         if (ret == -ENOSPC) {
 885                 ret = ext4_da_convert_inline_data_to_extent(mapping,
 886                                                             inode,
 887                                                             flags,
 888                                                             fsdata);
 889                 ext4_journal_stop(handle);
 890                 if (ret == -ENOSPC &&
 891                     ext4_should_retry_alloc(inode->i_sb, &retries))
 892                         goto retry_journal;
 893                 goto out;
 894         }
 895
 896
 897         page = grab_cache_page_write_begin(mapping, 0, flags);
 898         if (!page) {
 899                 ret = -ENOMEM;
 900                 goto out_journal;
 901         }
 902
 903         down_read(&EXT4_I(inode)->xattr_sem);
 904         if (!ext4_has_inline_data(inode)) {
 905                 ret = 0;
 906                 goto out_release_page;
 907         }
 908
 909         if (!PageUptodate(page)) {
 910                 ret = ext4_read_inline_page(inode, page);
 911                 if (ret < 0)
 912                         goto out_release_page;
 913         }
 914
 915         up_read(&EXT4_I(inode)->xattr_sem);
 916         *pagep = page;
 917         brelse(iloc.bh);
 918         return 1;
 919 out_release_page:
 920         up_read(&EXT4_I(inode)->xattr_sem);
 921         unlock_page(page);
 922         page_cache_release(page);
 923 out_journal:
 924         ext4_journal_stop(handle);
 925 out:
 926         brelse(iloc.bh);
 927         return ret;
 928 }
 929
 930 int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
 931                                   unsigned len, unsigned copied,
 932                                   struct page *page)
 933 {
 934         int i_size_changed = 0;
 935
 936         copied = ext4_write_inline_data_end(inode, pos, len, copied, page);
 937
 938         /*
 939          * No need to use i_size_read() here, the i_size
 940          * cannot change under us because we hold i_mutex.
 941          *
 942          * But it's important to update i_size while still holding page lock:
 943          * page writeout could otherwise come in and zero beyond i_size.
 944          */
 945         if (pos+copied > inode->i_size) {
 946                 i_size_write(inode, pos+copied);
 947                 i_size_changed = 1;
 948         }
 949         unlock_page(page);
 950         page_cache_release(page);
 951
 952         /*
 953          * Don't mark the inode dirty under page lock. First, it unnecessarily
 954          * makes the holding time of page lock longer. Second, it forces lock
 955          * ordering of page lock and transaction start for journaling
 956          * filesystems.
 957          */
 958         if (i_size_changed)
 959                 mark_inode_dirty(inode);
 960
 961         return copied;
 962 }
 963
 964 #ifdef INLINE_DIR_DEBUG
 965 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
 966                           void *inline_start, int inline_size)
 967 {
 968         int offset;
 969         unsigned short de_len;
 970         struct ext4_dir_entry_2 *de = inline_start;
 971         void *dlimit = inline_start + inline_size;
 972
 973         trace_printk("inode %lu\n", dir->i_ino);
 974         offset = 0;
 975         while ((void *)de < dlimit) {
 976                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
 977                 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
 978                              offset, de_len, de->name_len, de->name,
 979                              de->name_len, le32_to_cpu(de->inode));
 980                 if (ext4_check_dir_entry(dir, NULL, de, bh,
 981                                          inline_start, inline_size, offset))
 982                         BUG();
 983
 984                 offset += de_len;
 985                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
 986         }
 987 }
 988 #else
 989 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
 990 #endif
 991
 992 /*
 993  * Add a new entry into a inline dir.
 994  * It will return -ENOSPC if no space is available, and -EIO
 995  * and -EEXIST if directory entry already exists.
 996  */
 997 static int ext4_add_dirent_to_inline(handle_t *handle,
 998                                      struct ext4_filename *fname,
 999                                      struct dentry *dentry,
1000                                      struct inode *inode,
1001                                      struct ext4_iloc *iloc,
1002                                      void *inline_start, int inline_size)
1003 {
1004         struct inode    *dir = d_inode(dentry->d_parent);
1005         int             err;
1006         struct ext4_dir_entry_2 *de;
1007
1008         err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1009                                 inline_size, fname, &de);
1010         if (err)
1011                 return err;
1012
1013         BUFFER_TRACE(iloc->bh, "get_write_access");
1014         err = ext4_journal_get_write_access(handle, iloc->bh);
1015         if (err)
1016                 return err;
1017         ext4_insert_dentry(dir, inode, de, inline_size, fname);
1018
1019         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1020
1021         /*
1022          * XXX shouldn't update any times until successful
1023          * completion of syscall, but too many callers depend
1024          * on this.
1025          *
1026          * XXX similarly, too many callers depend on
1027          * ext4_new_inode() setting the times, but error
1028          * recovery deletes the inode, so the worst that can
1029          * happen is that the times are slightly out of date
1030          * and/or different from the directory change time.
1031          */
1032         dir->i_mtime = dir->i_ctime = ext4_current_time(dir);
1033         ext4_update_dx_flag(dir);
1034         dir->i_version++;
1035         ext4_mark_inode_dirty(handle, dir);
1036         return 1;
1037 }
1038
1039 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1040                                        struct ext4_iloc *iloc)
1041 {
1042         struct ext4_xattr_entry *entry;
1043         struct ext4_xattr_ibody_header *header;
1044
1045         BUG_ON(!EXT4_I(inode)->i_inline_off);
1046
1047         header = IHDR(inode, ext4_raw_inode(iloc));
1048         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1049                                             EXT4_I(inode)->i_inline_off);
1050
1051         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1052 }
1053
1054 /* Set the final de to cover the whole block. */
1055 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1056 {
1057         struct ext4_dir_entry_2 *de, *prev_de;
1058         void *limit;
1059         int de_len;
1060
1061         de = (struct ext4_dir_entry_2 *)de_buf;
1062         if (old_size) {
1063                 limit = de_buf + old_size;
1064                 do {
1065                         prev_de = de;
1066                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1067                         de_buf += de_len;
1068                         de = (struct ext4_dir_entry_2 *)de_buf;
1069                 } while (de_buf < limit);
1070
1071                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1072                                                         old_size, new_size);
1073         } else {
1074                 /* this is just created, so create an empty entry. */
1075                 de->inode = 0;
1076                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1077         }
1078 }
1079
1080 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1081                                   struct ext4_iloc *iloc)
1082 {
1083         int ret;
1084         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1085         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1086
1087         if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1088                 return -ENOSPC;
1089
1090         ret = ext4_update_inline_data(handle, dir,
1091                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1092         if (ret)
1093                 return ret;
1094
1095         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1096                              EXT4_I(dir)->i_inline_size -
1097                                                 EXT4_MIN_INLINE_DATA_SIZE);
1098         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1099         return 0;
1100 }
1101
1102 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1103                                      struct ext4_iloc *iloc,
1104                                      void *buf, int inline_size)
1105 {
1106         ext4_create_inline_data(handle, inode, inline_size);
1107         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1108         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1109 }
1110
1111 static int ext4_finish_convert_inline_dir(handle_t *handle,
1112                                           struct inode *inode,
1113                                           struct buffer_head *dir_block,
1114                                           void *buf,
1115                                           int inline_size)
1116 {
1117         int err, csum_size = 0, header_size = 0;
1118         struct ext4_dir_entry_2 *de;
1119         struct ext4_dir_entry_tail *t;
1120         void *target = dir_block->b_data;
1121
1122         /*
1123          * First create "." and ".." and then copy the dir information
1124          * back to the block.
1125          */
1126         de = (struct ext4_dir_entry_2 *)target;
1127         de = ext4_init_dot_dotdot(inode, de,
1128                 inode->i_sb->s_blocksize, csum_size,
1129                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1130         header_size = (void *)de - target;
1131
1132         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1133                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1134
1135         if (ext4_has_metadata_csum(inode->i_sb))
1136                 csum_size = sizeof(struct ext4_dir_entry_tail);
1137
1138         inode->i_size = inode->i_sb->s_blocksize;
1139         i_size_write(inode, inode->i_sb->s_blocksize);
1140         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1141         ext4_update_final_de(dir_block->b_data,
1142                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1143                         inode->i_sb->s_blocksize - csum_size);
1144
1145         if (csum_size) {
1146                 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1147                                      inode->i_sb->s_blocksize);
1148                 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1149         }
1150         set_buffer_uptodate(dir_block);
1151         err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1152         if (err)
1153                 goto out;
1154         set_buffer_verified(dir_block);
1155 out:
1156         return err;
1157 }
1158
1159 static int ext4_convert_inline_data_nolock(handle_t *handle,
1160                                            struct inode *inode,
1161                                            struct ext4_iloc *iloc)
1162 {
1163         int error;
1164         void *buf = NULL;
1165         struct buffer_head *data_bh = NULL;
1166         struct ext4_map_blocks map;
1167         int inline_size;
1168
1169         inline_size = ext4_get_inline_size(inode);
1170         buf = kmalloc(inline_size, GFP_NOFS);
1171         if (!buf) {
1172                 error = -ENOMEM;
1173                 goto out;
1174         }
1175
1176         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1177         if (error < 0)
1178                 goto out;
1179
1180         /*
1181          * Make sure the inline directory entries pass checks before we try to
1182          * convert them, so that we avoid touching stuff that needs fsck.
1183          */
1184         if (S_ISDIR(inode->i_mode)) {
1185                 error = ext4_check_all_de(inode, iloc->bh,
1186                                         buf + EXT4_INLINE_DOTDOT_SIZE,
1187                                         inline_size - EXT4_INLINE_DOTDOT_SIZE);
1188                 if (error)
1189                         goto out;
1190         }
1191
1192         error = ext4_destroy_inline_data_nolock(handle, inode);
1193         if (error)
1194                 goto out;
1195
1196         map.m_lblk = 0;
1197         map.m_len = 1;
1198         map.m_flags = 0;
1199         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1200         if (error < 0)
1201                 goto out_restore;
1202         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1203                 error = -EIO;
1204                 goto out_restore;
1205         }
1206
1207         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1208         if (!data_bh) {
1209                 error = -ENOMEM;
1210                 goto out_restore;
1211         }
1212
1213         lock_buffer(data_bh);
1214         error = ext4_journal_get_create_access(handle, data_bh);
1215         if (error) {
1216                 unlock_buffer(data_bh);
1217                 error = -EIO;
1218                 goto out_restore;
1219         }
1220         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1221
1222         if (!S_ISDIR(inode->i_mode)) {
1223                 memcpy(data_bh->b_data, buf, inline_size);
1224                 set_buffer_uptodate(data_bh);
1225                 error = ext4_handle_dirty_metadata(handle,
1226                                                    inode, data_bh);
1227         } else {
1228                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1229                                                        buf, inline_size);
1230         }
1231
1232         unlock_buffer(data_bh);
1233 out_restore:
1234         if (error)
1235                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1236
1237 out:
1238         brelse(data_bh);
1239         kfree(buf);
1240         return error;
1241 }
1242
1243 /*
1244  * Try to add the new entry to the inline data.
1245  * If succeeds, return 0. If not, extended the inline dir and copied data to
1246  * the new created block.
1247  */
1248 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1249                               struct dentry *dentry, struct inode *inode)
1250 {
1251         int ret, inline_size;
1252         void *inline_start;
1253         struct ext4_iloc iloc;
1254         struct inode *dir = d_inode(dentry->d_parent);
1255
1256         ret = ext4_get_inode_loc(dir, &iloc);
1257         if (ret)
1258                 return ret;
1259
1260         down_write(&EXT4_I(dir)->xattr_sem);
1261         if (!ext4_has_inline_data(dir))
1262                 goto out;
1263
1264         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1265                                                  EXT4_INLINE_DOTDOT_SIZE;
1266         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1267
1268         ret = ext4_add_dirent_to_inline(handle, fname, dentry, inode, &iloc,
1269                                         inline_start, inline_size);
1270         if (ret != -ENOSPC)
1271                 goto out;
1272
1273         /* check whether it can be inserted to inline xattr space. */
1274         inline_size = EXT4_I(dir)->i_inline_size -
1275                         EXT4_MIN_INLINE_DATA_SIZE;
1276         if (!inline_size) {
1277                 /* Try to use the xattr space.*/
1278                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1279                 if (ret && ret != -ENOSPC)
1280                         goto out;
1281
1282                 inline_size = EXT4_I(dir)->i_inline_size -
1283                                 EXT4_MIN_INLINE_DATA_SIZE;
1284         }
1285
1286         if (inline_size) {
1287                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1288
1289                 ret = ext4_add_dirent_to_inline(handle, fname, dentry,
1290                                                 inode, &iloc, inline_start,
1291                                                 inline_size);
1292
1293                 if (ret != -ENOSPC)
1294                         goto out;
1295         }
1296
1297         /*
1298          * The inline space is filled up, so create a new block for it.
1299          * As the extent tree will be created, we have to save the inline
1300          * dir first.
1301          */
1302         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1303
1304 out:
1305         ext4_mark_inode_dirty(handle, dir);
1306         up_write(&EXT4_I(dir)->xattr_sem);
1307         brelse(iloc.bh);
1308         return ret;
1309 }
1310
1311 /*
1312  * This function fills a red-black tree with information from an
1313  * inlined dir.  It returns the number directory entries loaded
1314  * into the tree.  If there is an error it is returned in err.
1315  */
1316 int htree_inlinedir_to_tree(struct file *dir_file,
1317                             struct inode *dir, ext4_lblk_t block,
1318                             struct dx_hash_info *hinfo,
1319                             __u32 start_hash, __u32 start_minor_hash,
1320                             int *has_inline_data)
1321 {
1322         int err = 0, count = 0;
1323         unsigned int parent_ino;
1324         int pos;
1325         struct ext4_dir_entry_2 *de;
1326         struct inode *inode = file_inode(dir_file);
1327         int ret, inline_size = 0;
1328         struct ext4_iloc iloc;
1329         void *dir_buf = NULL;
1330         struct ext4_dir_entry_2 fake;
1331         struct ext4_str tmp_str;
1332
1333         ret = ext4_get_inode_loc(inode, &iloc);
1334         if (ret)
1335                 return ret;
1336
1337         down_read(&EXT4_I(inode)->xattr_sem);
1338         if (!ext4_has_inline_data(inode)) {
1339                 up_read(&EXT4_I(inode)->xattr_sem);
1340                 *has_inline_data = 0;
1341                 goto out;
1342         }
1343
1344         inline_size = ext4_get_inline_size(inode);
1345         dir_buf = kmalloc(inline_size, GFP_NOFS);
1346         if (!dir_buf) {
1347                 ret = -ENOMEM;
1348                 up_read(&EXT4_I(inode)->xattr_sem);
1349                 goto out;
1350         }
1351
1352         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1353         up_read(&EXT4_I(inode)->xattr_sem);
1354         if (ret < 0)
1355                 goto out;
1356
1357         pos = 0;
1358         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1359         while (pos < inline_size) {
1360                 /*
1361                  * As inlined dir doesn't store any information about '.' and
1362                  * only the inode number of '..' is stored, we have to handle
1363                  * them differently.
1364                  */
1365                 if (pos == 0) {
1366                         fake.inode = cpu_to_le32(inode->i_ino);
1367                         fake.name_len = 1;
1368                         strcpy(fake.name, ".");
1369                         fake.rec_len = ext4_rec_len_to_disk(
1370                                                 EXT4_DIR_REC_LEN(fake.name_len),
1371                                                 inline_size);
1372                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1373                         de = &fake;
1374                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1375                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1376                         fake.inode = cpu_to_le32(parent_ino);
1377                         fake.name_len = 2;
1378                         strcpy(fake.name, "..");
1379                         fake.rec_len = ext4_rec_len_to_disk(
1380                                                 EXT4_DIR_REC_LEN(fake.name_len),
1381                                                 inline_size);
1382                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1383                         de = &fake;
1384                         pos = EXT4_INLINE_DOTDOT_SIZE;
1385                 } else {
1386                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1387                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1388                         if (ext4_check_dir_entry(inode, dir_file, de,
1389                                          iloc.bh, dir_buf,
1390                                          inline_size, pos)) {
1391                                 ret = count;
1392                                 goto out;
1393                         }
1394                 }
1395
1396                 ext4fs_dirhash(de->name, de->name_len, hinfo);
1397                 if ((hinfo->hash < start_hash) ||
1398                     ((hinfo->hash == start_hash) &&
1399                      (hinfo->minor_hash < start_minor_hash)))
1400                         continue;
1401                 if (de->inode == 0)
1402                         continue;
1403                 tmp_str.name = de->name;
1404                 tmp_str.len = de->name_len;
1405                 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1406                                               hinfo->minor_hash, de, &tmp_str);
1407                 if (err) {
1408                         count = err;
1409                         goto out;
1410                 }
1411                 count++;
1412         }
1413         ret = count;
1414 out:
1415         kfree(dir_buf);
1416         brelse(iloc.bh);
1417         return ret;
1418 }
1419
1420 /*
1421  * So this function is called when the volume is mkfsed with
1422  * dir_index disabled. In order to keep f_pos persistent
1423  * after we convert from an inlined dir to a blocked based,
1424  * we just pretend that we are a normal dir and return the
1425  * offset as if '.' and '..' really take place.
1426  *
1427  */
1428 int ext4_read_inline_dir(struct file *file,
1429                          struct dir_context *ctx,
1430                          int *has_inline_data)
1431 {
1432         unsigned int offset, parent_ino;
1433         int i;
1434         struct ext4_dir_entry_2 *de;
1435         struct super_block *sb;
1436         struct inode *inode = file_inode(file);
1437         int ret, inline_size = 0;
1438         struct ext4_iloc iloc;
1439         void *dir_buf = NULL;
1440         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1441
1442         ret = ext4_get_inode_loc(inode, &iloc);
1443         if (ret)
1444                 return ret;
1445
1446         down_read(&EXT4_I(inode)->xattr_sem);
1447         if (!ext4_has_inline_data(inode)) {
1448                 up_read(&EXT4_I(inode)->xattr_sem);
1449                 *has_inline_data = 0;
1450                 goto out;
1451         }
1452
1453         inline_size = ext4_get_inline_size(inode);
1454         dir_buf = kmalloc(inline_size, GFP_NOFS);
1455         if (!dir_buf) {
1456                 ret = -ENOMEM;
1457                 up_read(&EXT4_I(inode)->xattr_sem);
1458                 goto out;
1459         }
1460
1461         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1462         up_read(&EXT4_I(inode)->xattr_sem);
1463         if (ret < 0)
1464                 goto out;
1465
1466         ret = 0;
1467         sb = inode->i_sb;
1468         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1469         offset = ctx->pos;
1470
1471         /*
1472          * dotdot_offset and dotdot_size is the real offset and
1473          * size for ".." and "." if the dir is block based while
1474          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1475          * So we will use extra_offset and extra_size to indicate them
1476          * during the inline dir iteration.
1477          */
1478         dotdot_offset = EXT4_DIR_REC_LEN(1);
1479         dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1480         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1481         extra_size = extra_offset + inline_size;
1482
1483         /*
1484          * If the version has changed since the last call to
1485          * readdir(2), then we might be pointing to an invalid
1486          * dirent right now.  Scan from the start of the inline
1487          * dir to make sure.
1488          */
1489         if (file->f_version != inode->i_version) {
1490                 for (i = 0; i < extra_size && i < offset;) {
1491                         /*
1492                          * "." is with offset 0 and
1493                          * ".." is dotdot_offset.
1494                          */
1495                         if (!i) {
1496                                 i = dotdot_offset;
1497                                 continue;
1498                         } else if (i == dotdot_offset) {
1499                                 i = dotdot_size;
1500                                 continue;
1501                         }
1502                         /* for other entry, the real offset in
1503                          * the buf has to be tuned accordingly.
1504                          */
1505                         de = (struct ext4_dir_entry_2 *)
1506                                 (dir_buf + i - extra_offset);
1507                         /* It's too expensive to do a full
1508                          * dirent test each time round this
1509                          * loop, but we do have to test at
1510                          * least that it is non-zero.  A
1511                          * failure will be detected in the
1512                          * dirent test below. */
1513                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1514                                 < EXT4_DIR_REC_LEN(1))
1515                                 break;
1516                         i += ext4_rec_len_from_disk(de->rec_len,
1517                                                     extra_size);
1518                 }
1519                 offset = i;
1520                 ctx->pos = offset;
1521                 file->f_version = inode->i_version;
1522         }
1523
1524         while (ctx->pos < extra_size) {
1525                 if (ctx->pos == 0) {
1526                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1527                                 goto out;
1528                         ctx->pos = dotdot_offset;
1529                         continue;
1530                 }
1531
1532                 if (ctx->pos == dotdot_offset) {
1533                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1534                                 goto out;
1535                         ctx->pos = dotdot_size;
1536                         continue;
1537                 }
1538
1539                 de = (struct ext4_dir_entry_2 *)
1540                         (dir_buf + ctx->pos - extra_offset);
1541                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1542                                          extra_size, ctx->pos))
1543                         goto out;
1544                 if (le32_to_cpu(de->inode)) {
1545                         if (!dir_emit(ctx, de->name, de->name_len,
1546                                       le32_to_cpu(de->inode),
1547                                       get_dtype(sb, de->file_type)))
1548                                 goto out;
1549                 }
1550                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1551         }
1552 out:
1553         kfree(dir_buf);
1554         brelse(iloc.bh);
1555         return ret;
1556 }
1557
1558 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1559                                         struct ext4_dir_entry_2 **parent_de,
1560                                         int *retval)
1561 {
1562         struct ext4_iloc iloc;
1563
1564         *retval = ext4_get_inode_loc(inode, &iloc);
1565         if (*retval)
1566                 return NULL;
1567
1568         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1569
1570         return iloc.bh;
1571 }
1572
1573 /*
1574  * Try to create the inline data for the new dir.
1575  * If it succeeds, return 0, otherwise return the error.
1576  * In case of ENOSPC, the caller should create the normal disk layout dir.
1577  */
1578 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1579                                struct inode *inode)
1580 {
1581         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1582         struct ext4_iloc iloc;
1583         struct ext4_dir_entry_2 *de;
1584
1585         ret = ext4_get_inode_loc(inode, &iloc);
1586         if (ret)
1587                 return ret;
1588
1589         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1590         if (ret)
1591                 goto out;
1592
1593         /*
1594          * For inline dir, we only save the inode information for the ".."
1595          * and create a fake dentry to cover the left space.
1596          */
1597         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1598         de->inode = cpu_to_le32(parent->i_ino);
1599         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1600         de->inode = 0;
1601         de->rec_len = ext4_rec_len_to_disk(
1602                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1603                                 inline_size);
1604         set_nlink(inode, 2);
1605         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1606 out:
1607         brelse(iloc.bh);
1608         return ret;
1609 }
1610
1611 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1612                                         struct ext4_filename *fname,
1613                                         const struct qstr *d_name,
1614                                         struct ext4_dir_entry_2 **res_dir,
1615                                         int *has_inline_data)
1616 {
1617         int ret;
1618         struct ext4_iloc iloc;
1619         void *inline_start;
1620         int inline_size;
1621
1622         if (ext4_get_inode_loc(dir, &iloc))
1623                 return NULL;
1624
1625         down_read(&EXT4_I(dir)->xattr_sem);
1626         if (!ext4_has_inline_data(dir)) {
1627                 *has_inline_data = 0;
1628                 goto out;
1629         }
1630
1631         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1632                                                 EXT4_INLINE_DOTDOT_SIZE;
1633         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1634         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1635                               dir, fname, d_name, 0, res_dir);
1636         if (ret == 1)
1637                 goto out_find;
1638         if (ret < 0)
1639                 goto out;
1640
1641         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1642                 goto out;
1643
1644         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1645         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1646
1647         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1648                               dir, fname, d_name, 0, res_dir);
1649         if (ret == 1)
1650                 goto out_find;
1651
1652 out:
1653         brelse(iloc.bh);
1654         iloc.bh = NULL;
1655 out_find:
1656         up_read(&EXT4_I(dir)->xattr_sem);
1657         return iloc.bh;
1658 }
1659
1660 int ext4_delete_inline_entry(handle_t *handle,
1661                              struct inode *dir,
1662                              struct ext4_dir_entry_2 *de_del,
1663                              struct buffer_head *bh,
1664                              int *has_inline_data)
1665 {
1666         int err, inline_size;
1667         struct ext4_iloc iloc;
1668         void *inline_start;
1669
1670         err = ext4_get_inode_loc(dir, &iloc);
1671         if (err)
1672                 return err;
1673
1674         down_write(&EXT4_I(dir)->xattr_sem);
1675         if (!ext4_has_inline_data(dir)) {
1676                 *has_inline_data = 0;
1677                 goto out;
1678         }
1679
1680         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1681                 EXT4_MIN_INLINE_DATA_SIZE) {
1682                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1683                                         EXT4_INLINE_DOTDOT_SIZE;
1684                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1685                                 EXT4_INLINE_DOTDOT_SIZE;
1686         } else {
1687                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1688                 inline_size = ext4_get_inline_size(dir) -
1689                                 EXT4_MIN_INLINE_DATA_SIZE;
1690         }
1691
1692         BUFFER_TRACE(bh, "get_write_access");
1693         err = ext4_journal_get_write_access(handle, bh);
1694         if (err)
1695                 goto out;
1696
1697         err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1698                                         inline_start, inline_size, 0);
1699         if (err)
1700                 goto out;
1701
1702         BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
1703         err = ext4_mark_inode_dirty(handle, dir);
1704         if (unlikely(err))
1705                 goto out;
1706
1707         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1708 out:
1709         up_write(&EXT4_I(dir)->xattr_sem);
1710         brelse(iloc.bh);
1711         if (err != -ENOENT)
1712                 ext4_std_error(dir->i_sb, err);
1713         return err;
1714 }
1715
1716 /*
1717  * Get the inline dentry at offset.
1718  */
1719 static inline struct ext4_dir_entry_2 *
1720 ext4_get_inline_entry(struct inode *inode,
1721                       struct ext4_iloc *iloc,
1722                       unsigned int offset,
1723                       void **inline_start,
1724                       int *inline_size)
1725 {
1726         void *inline_pos;
1727
1728         BUG_ON(offset > ext4_get_inline_size(inode));
1729
1730         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1731                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1732                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1733         } else {
1734                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1735                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1736                 *inline_size = ext4_get_inline_size(inode) -
1737                                 EXT4_MIN_INLINE_DATA_SIZE;
1738         }
1739
1740         if (inline_start)
1741                 *inline_start = inline_pos;
1742         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1743 }
1744
1745 int empty_inline_dir(struct inode *dir, int *has_inline_data)
1746 {
1747         int err, inline_size;
1748         struct ext4_iloc iloc;
1749         void *inline_pos;
1750         unsigned int offset;
1751         struct ext4_dir_entry_2 *de;
1752         int ret = 1;
1753
1754         err = ext4_get_inode_loc(dir, &iloc);
1755         if (err) {
1756                 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1757                                  err, dir->i_ino);
1758                 return 1;
1759         }
1760
1761         down_read(&EXT4_I(dir)->xattr_sem);
1762         if (!ext4_has_inline_data(dir)) {
1763                 *has_inline_data = 0;
1764                 goto out;
1765         }
1766
1767         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1768         if (!le32_to_cpu(de->inode)) {
1769                 ext4_warning(dir->i_sb,
1770                              "bad inline directory (dir #%lu) - no `..'",
1771                              dir->i_ino);
1772                 ret = 1;
1773                 goto out;
1774         }
1775
1776         offset = EXT4_INLINE_DOTDOT_SIZE;
1777         while (offset < dir->i_size) {
1778                 de = ext4_get_inline_entry(dir, &iloc, offset,
1779                                            &inline_pos, &inline_size);
1780                 if (ext4_check_dir_entry(dir, NULL, de,
1781                                          iloc.bh, inline_pos,
1782                                          inline_size, offset)) {
1783                         ext4_warning(dir->i_sb,
1784                                      "bad inline directory (dir #%lu) - "
1785                                      "inode %u, rec_len %u, name_len %d"
1786                                      "inline size %d\n",
1787                                      dir->i_ino, le32_to_cpu(de->inode),
1788                                      le16_to_cpu(de->rec_len), de->name_len,
1789                                      inline_size);
1790                         ret = 1;
1791                         goto out;
1792                 }
1793                 if (le32_to_cpu(de->inode)) {
1794                         ret = 0;
1795                         goto out;
1796                 }
1797                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1798         }
1799
1800 out:
1801         up_read(&EXT4_I(dir)->xattr_sem);
1802         brelse(iloc.bh);
1803         return ret;
1804 }
1805
1806 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1807 {
1808         int ret;
1809
1810         down_write(&EXT4_I(inode)->xattr_sem);
1811         ret = ext4_destroy_inline_data_nolock(handle, inode);
1812         up_write(&EXT4_I(inode)->xattr_sem);
1813
1814         return ret;
1815 }
1816
1817 int ext4_inline_data_fiemap(struct inode *inode,
1818                             struct fiemap_extent_info *fieinfo,
1819                             int *has_inline, __u64 start, __u64 len)
1820 {
1821         __u64 physical = 0;
1822         __u64 inline_len;
1823         __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
1824                 FIEMAP_EXTENT_LAST;
1825         int error = 0;
1826         struct ext4_iloc iloc;
1827
1828         down_read(&EXT4_I(inode)->xattr_sem);
1829         if (!ext4_has_inline_data(inode)) {
1830                 *has_inline = 0;
1831                 goto out;
1832         }
1833         inline_len = min_t(size_t, ext4_get_inline_size(inode),
1834                            i_size_read(inode));
1835         if (start >= inline_len)
1836                 goto out;
1837         if (start + len < inline_len)
1838                 inline_len = start + len;
1839         inline_len -= start;
1840
1841         error = ext4_get_inode_loc(inode, &iloc);
1842         if (error)
1843                 goto out;
1844
1845         physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1846         physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1847         physical += offsetof(struct ext4_inode, i_block);
1848
1849         if (physical)
1850                 error = fiemap_fill_next_extent(fieinfo, start, physical,
1851                                                 inline_len, flags);
1852         brelse(iloc.bh);
1853 out:
1854         up_read(&EXT4_I(inode)->xattr_sem);
1855         return (error < 0 ? error : 0);
1856 }
1857
1858 /*
1859  * Called during xattr set, and if we can sparse space 'needed',
1860  * just create the extent tree evict the data to the outer block.
1861  *
1862  * We use jbd2 instead of page cache to move data to the 1st block
1863  * so that the whole transaction can be committed as a whole and
1864  * the data isn't lost because of the delayed page cache write.
1865  */
1866 int ext4_try_to_evict_inline_data(handle_t *handle,
1867                                   struct inode *inode,
1868                                   int needed)
1869 {
1870         int error;
1871         struct ext4_xattr_entry *entry;
1872         struct ext4_inode *raw_inode;
1873         struct ext4_iloc iloc;
1874
1875         error = ext4_get_inode_loc(inode, &iloc);
1876         if (error)
1877                 return error;
1878
1879         raw_inode = ext4_raw_inode(&iloc);
1880         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
1881                                             EXT4_I(inode)->i_inline_off);
1882         if (EXT4_XATTR_LEN(entry->e_name_len) +
1883             EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
1884                 error = -ENOSPC;
1885                 goto out;
1886         }
1887
1888         error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1889 out:
1890         brelse(iloc.bh);
1891         return error;
1892 }
1893
1894 void ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1895 {
1896         handle_t *handle;
1897         int inline_size, value_len, needed_blocks;
1898         size_t i_size;
1899         void *value = NULL;
1900         struct ext4_xattr_ibody_find is = {
1901                 .s = { .not_found = -ENODATA, },
1902         };
1903         struct ext4_xattr_info i = {
1904                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1905                 .name = EXT4_XATTR_SYSTEM_DATA,
1906         };
1907
1908
1909         needed_blocks = ext4_writepage_trans_blocks(inode);
1910         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1911         if (IS_ERR(handle))
1912                 return;
1913
1914         down_write(&EXT4_I(inode)->xattr_sem);
1915         if (!ext4_has_inline_data(inode)) {
1916                 *has_inline = 0;
1917                 ext4_journal_stop(handle);
1918                 return;
1919         }
1920
1921         if (ext4_orphan_add(handle, inode))
1922                 goto out;
1923
1924         if (ext4_get_inode_loc(inode, &is.iloc))
1925                 goto out;
1926
1927         down_write(&EXT4_I(inode)->i_data_sem);
1928         i_size = inode->i_size;
1929         inline_size = ext4_get_inline_size(inode);
1930         EXT4_I(inode)->i_disksize = i_size;
1931
1932         if (i_size < inline_size) {
1933                 /* Clear the content in the xattr space. */
1934                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1935                         if (ext4_xattr_ibody_find(inode, &i, &is))
1936                                 goto out_error;
1937
1938                         BUG_ON(is.s.not_found);
1939
1940                         value_len = le32_to_cpu(is.s.here->e_value_size);
1941                         value = kmalloc(value_len, GFP_NOFS);
1942                         if (!value)
1943                                 goto out_error;
1944
1945                         if (ext4_xattr_ibody_get(inode, i.name_index, i.name,
1946                                                 value, value_len))
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                         if (ext4_xattr_ibody_inline_set(handle, inode, &i, &is))
1953                                 goto out_error;
1954                 }
1955
1956                 /* Clear the content within i_blocks. */
1957                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1958                         void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1959                         memset(p + i_size, 0,
1960                                EXT4_MIN_INLINE_DATA_SIZE - i_size);
1961                 }
1962
1963                 EXT4_I(inode)->i_inline_size = i_size <
1964                                         EXT4_MIN_INLINE_DATA_SIZE ?
1965                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
1966         }
1967
1968 out_error:
1969         up_write(&EXT4_I(inode)->i_data_sem);
1970 out:
1971         brelse(is.iloc.bh);
1972         up_write(&EXT4_I(inode)->xattr_sem);
1973         kfree(value);
1974         if (inode->i_nlink)
1975                 ext4_orphan_del(handle, inode);
1976
1977         inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
1978         ext4_mark_inode_dirty(handle, inode);
1979         if (IS_SYNC(inode))
1980                 ext4_handle_sync(handle);
1981
1982         ext4_journal_stop(handle);
1983         return;
1984 }
1985
1986 int ext4_convert_inline_data(struct inode *inode)
1987 {
1988         int error, needed_blocks;
1989         handle_t *handle;
1990         struct ext4_iloc iloc;
1991
1992         if (!ext4_has_inline_data(inode)) {
1993                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1994                 return 0;
1995         }
1996
1997         needed_blocks = ext4_writepage_trans_blocks(inode);
1998
1999         iloc.bh = NULL;
2000         error = ext4_get_inode_loc(inode, &iloc);
2001         if (error)
2002                 return error;
2003
2004         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2005         if (IS_ERR(handle)) {
2006                 error = PTR_ERR(handle);
2007                 goto out_free;
2008         }
2009
2010         down_write(&EXT4_I(inode)->xattr_sem);
2011         if (!ext4_has_inline_data(inode)) {
2012                 up_write(&EXT4_I(inode)->xattr_sem);
2013                 goto out;
2014         }
2015
2016         error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2017         up_write(&EXT4_I(inode)->xattr_sem);
2018 out:
2019         ext4_journal_stop(handle);
2020 out_free:
2021         brelse(iloc.bh);
2022         return error;
2023 }