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         /*
 303          * Propagate changes to inode->i_flags as well - e.g. S_DAX may
 304          * get cleared
 305          */
 306         ext4_set_inode_flags(inode);
 307         get_bh(is.iloc.bh);
 308         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 309
 310 out:
 311         brelse(is.iloc.bh);
 312         return error;
 313 }
 314
 315 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
 316                                    unsigned int len)
 317 {
 318         int error;
 319         void *value = NULL;
 320         struct ext4_xattr_ibody_find is = {
 321                 .s = { .not_found = -ENODATA, },
 322         };
 323         struct ext4_xattr_info i = {
 324                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 325                 .name = EXT4_XATTR_SYSTEM_DATA,
 326         };
 327
 328         /* If the old space is ok, write the data directly. */
 329         if (len <= EXT4_I(inode)->i_inline_size)
 330                 return 0;
 331
 332         error = ext4_get_inode_loc(inode, &is.iloc);
 333         if (error)
 334                 return error;
 335
 336         error = ext4_xattr_ibody_find(inode, &i, &is);
 337         if (error)
 338                 goto out;
 339
 340         BUG_ON(is.s.not_found);
 341
 342         len -= EXT4_MIN_INLINE_DATA_SIZE;
 343         value = kzalloc(len, GFP_NOFS);
 344         if (!value) {
 345                 error = -ENOMEM;
 346                 goto out;
 347         }
 348
 349         error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
 350                                      value, len);
 351         if (error == -ENODATA)
 352                 goto out;
 353
 354         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 355         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 356         if (error)
 357                 goto out;
 358
 359         /* Update the xttr entry. */
 360         i.value = value;
 361         i.value_len = len;
 362
 363         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 364         if (error)
 365                 goto out;
 366
 367         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 368                                       (void *)ext4_raw_inode(&is.iloc));
 369         EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 370                                 le32_to_cpu(is.s.here->e_value_size);
 371         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 372         get_bh(is.iloc.bh);
 373         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 374
 375 out:
 376         kfree(value);
 377         brelse(is.iloc.bh);
 378         return error;
 379 }
 380
 381 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
 382                                     unsigned int len)
 383 {
 384         int ret, size;
 385         struct ext4_inode_info *ei = EXT4_I(inode);
 386
 387         if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
 388                 return -ENOSPC;
 389
 390         size = ext4_get_max_inline_size(inode);
 391         if (size < len)
 392                 return -ENOSPC;
 393
 394         down_write(&EXT4_I(inode)->xattr_sem);
 395
 396         if (ei->i_inline_off)
 397                 ret = ext4_update_inline_data(handle, inode, len);
 398         else
 399                 ret = ext4_create_inline_data(handle, inode, len);
 400
 401         up_write(&EXT4_I(inode)->xattr_sem);
 402
 403         return ret;
 404 }
 405
 406 static int ext4_destroy_inline_data_nolock(handle_t *handle,
 407                                            struct inode *inode)
 408 {
 409         struct ext4_inode_info *ei = EXT4_I(inode);
 410         struct ext4_xattr_ibody_find is = {
 411                 .s = { .not_found = 0, },
 412         };
 413         struct ext4_xattr_info i = {
 414                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 415                 .name = EXT4_XATTR_SYSTEM_DATA,
 416                 .value = NULL,
 417                 .value_len = 0,
 418         };
 419         int error;
 420
 421         if (!ei->i_inline_off)
 422                 return 0;
 423
 424         error = ext4_get_inode_loc(inode, &is.iloc);
 425         if (error)
 426                 return error;
 427
 428         error = ext4_xattr_ibody_find(inode, &i, &is);
 429         if (error)
 430                 goto out;
 431
 432         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 433         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 434         if (error)
 435                 goto out;
 436
 437         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 438         if (error)
 439                 goto out;
 440
 441         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 442                 0, EXT4_MIN_INLINE_DATA_SIZE);
 443
 444         if (ext4_has_feature_extents(inode->i_sb)) {
 445                 if (S_ISDIR(inode->i_mode) ||
 446                     S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
 447                         ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
 448                         ext4_ext_tree_init(handle, inode);
 449                 }
 450         }
 451         ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 452         /*
 453          * Propagate changes to inode->i_flags as well - e.g. S_DAX may
 454          * get set.
 455          */
 456         ext4_set_inode_flags(inode);
 457
 458         get_bh(is.iloc.bh);
 459         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 460
 461         EXT4_I(inode)->i_inline_off = 0;
 462         EXT4_I(inode)->i_inline_size = 0;
 463         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 464 out:
 465         brelse(is.iloc.bh);
 466         if (error == -ENODATA)
 467                 error = 0;
 468         return error;
 469 }
 470
 471 static int ext4_read_inline_page(struct inode *inode, struct page *page)
 472 {
 473         void *kaddr;
 474         int ret = 0;
 475         size_t len;
 476         struct ext4_iloc iloc;
 477
 478         BUG_ON(!PageLocked(page));
 479         BUG_ON(!ext4_has_inline_data(inode));
 480         BUG_ON(page->index);
 481
 482         if (!EXT4_I(inode)->i_inline_off) {
 483                 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
 484                              inode->i_ino);
 485                 goto out;
 486         }
 487
 488         ret = ext4_get_inode_loc(inode, &iloc);
 489         if (ret)
 490                 goto out;
 491
 492         len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
 493         kaddr = kmap_atomic(page);
 494         ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
 495         flush_dcache_page(page);
 496         kunmap_atomic(kaddr);
 497         zero_user_segment(page, len, PAGE_SIZE);
 498         SetPageUptodate(page);
 499         brelse(iloc.bh);
 500
 501 out:
 502         return ret;
 503 }
 504
 505 int ext4_readpage_inline(struct inode *inode, struct page *page)
 506 {
 507         int ret = 0;
 508
 509         down_read(&EXT4_I(inode)->xattr_sem);
 510         if (!ext4_has_inline_data(inode)) {
 511                 up_read(&EXT4_I(inode)->xattr_sem);
 512                 return -EAGAIN;
 513         }
 514
 515         /*
 516          * Current inline data can only exist in the 1st page,
 517          * So for all the other pages, just set them uptodate.
 518          */
 519         if (!page->index)
 520                 ret = ext4_read_inline_page(inode, page);
 521         else if (!PageUptodate(page)) {
 522                 zero_user_segment(page, 0, PAGE_SIZE);
 523                 SetPageUptodate(page);
 524         }
 525
 526         up_read(&EXT4_I(inode)->xattr_sem);
 527
 528         unlock_page(page);
 529         return ret >= 0 ? 0 : ret;
 530 }
 531
 532 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
 533                                               struct inode *inode,
 534                                               unsigned flags)
 535 {
 536         int ret, needed_blocks;
 537         handle_t *handle = NULL;
 538         int retries = 0, sem_held = 0;
 539         struct page *page = NULL;
 540         unsigned from, to;
 541         struct ext4_iloc iloc;
 542
 543         if (!ext4_has_inline_data(inode)) {
 544                 /*
 545                  * clear the flag so that no new write
 546                  * will trap here again.
 547                  */
 548                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 549                 return 0;
 550         }
 551
 552         needed_blocks = ext4_writepage_trans_blocks(inode);
 553
 554         ret = ext4_get_inode_loc(inode, &iloc);
 555         if (ret)
 556                 return ret;
 557
 558 retry:
 559         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
 560         if (IS_ERR(handle)) {
 561                 ret = PTR_ERR(handle);
 562                 handle = NULL;
 563                 goto out;
 564         }
 565
 566         /* We cannot recurse into the filesystem as the transaction is already
 567          * started */
 568         flags |= AOP_FLAG_NOFS;
 569
 570         page = grab_cache_page_write_begin(mapping, 0, flags);
 571         if (!page) {
 572                 ret = -ENOMEM;
 573                 goto out;
 574         }
 575
 576         down_write(&EXT4_I(inode)->xattr_sem);
 577         sem_held = 1;
 578         /* If some one has already done this for us, just exit. */
 579         if (!ext4_has_inline_data(inode)) {
 580                 ret = 0;
 581                 goto out;
 582         }
 583
 584         from = 0;
 585         to = ext4_get_inline_size(inode);
 586         if (!PageUptodate(page)) {
 587                 ret = ext4_read_inline_page(inode, page);
 588                 if (ret < 0)
 589                         goto out;
 590         }
 591
 592         ret = ext4_destroy_inline_data_nolock(handle, inode);
 593         if (ret)
 594                 goto out;
 595
 596         if (ext4_should_dioread_nolock(inode)) {
 597                 ret = __block_write_begin(page, from, to,
 598                                           ext4_get_block_unwritten);
 599         } else
 600                 ret = __block_write_begin(page, from, to, ext4_get_block);
 601
 602         if (!ret && ext4_should_journal_data(inode)) {
 603                 ret = ext4_walk_page_buffers(handle, page_buffers(page),
 604                                              from, to, NULL,
 605                                              do_journal_get_write_access);
 606         }
 607
 608         if (ret) {
 609                 unlock_page(page);
 610                 put_page(page);
 611                 page = NULL;
 612                 ext4_orphan_add(handle, inode);
 613                 up_write(&EXT4_I(inode)->xattr_sem);
 614                 sem_held = 0;
 615                 ext4_journal_stop(handle);
 616                 handle = NULL;
 617                 ext4_truncate_failed_write(inode);
 618                 /*
 619                  * If truncate failed early the inode might
 620                  * still be on the orphan list; we need to
 621                  * make sure the inode is removed from the
 622                  * orphan list in that case.
 623                  */
 624                 if (inode->i_nlink)
 625                         ext4_orphan_del(NULL, inode);
 626         }
 627
 628         if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 629                 goto retry;
 630
 631         if (page)
 632                 block_commit_write(page, from, to);
 633 out:
 634         if (page) {
 635                 unlock_page(page);
 636                 put_page(page);
 637         }
 638         if (sem_held)
 639                 up_write(&EXT4_I(inode)->xattr_sem);
 640         if (handle)
 641                 ext4_journal_stop(handle);
 642         brelse(iloc.bh);
 643         return ret;
 644 }
 645
 646 /*
 647  * Try to write data in the inode.
 648  * If the inode has inline data, check whether the new write can be
 649  * in the inode also. If not, create the page the handle, move the data
 650  * to the page make it update and let the later codes create extent for it.
 651  */
 652 int ext4_try_to_write_inline_data(struct address_space *mapping,
 653                                   struct inode *inode,
 654                                   loff_t pos, unsigned len,
 655                                   unsigned flags,
 656                                   struct page **pagep)
 657 {
 658         int ret;
 659         handle_t *handle;
 660         struct page *page;
 661         struct ext4_iloc iloc;
 662
 663         if (pos + len > ext4_get_max_inline_size(inode))
 664                 goto convert;
 665
 666         ret = ext4_get_inode_loc(inode, &iloc);
 667         if (ret)
 668                 return ret;
 669
 670         /*
 671          * The possible write could happen in the inode,
 672          * so try to reserve the space in inode first.
 673          */
 674         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 675         if (IS_ERR(handle)) {
 676                 ret = PTR_ERR(handle);
 677                 handle = NULL;
 678                 goto out;
 679         }
 680
 681         ret = ext4_prepare_inline_data(handle, inode, pos + len);
 682         if (ret && ret != -ENOSPC)
 683                 goto out;
 684
 685         /* We don't have space in inline inode, so convert it to extent. */
 686         if (ret == -ENOSPC) {
 687                 ext4_journal_stop(handle);
 688                 brelse(iloc.bh);
 689                 goto convert;
 690         }
 691
 692         flags |= AOP_FLAG_NOFS;
 693
 694         page = grab_cache_page_write_begin(mapping, 0, flags);
 695         if (!page) {
 696                 ret = -ENOMEM;
 697                 goto out;
 698         }
 699
 700         *pagep = page;
 701         down_read(&EXT4_I(inode)->xattr_sem);
 702         if (!ext4_has_inline_data(inode)) {
 703                 ret = 0;
 704                 unlock_page(page);
 705                 put_page(page);
 706                 goto out_up_read;
 707         }
 708
 709         if (!PageUptodate(page)) {
 710                 ret = ext4_read_inline_page(inode, page);
 711                 if (ret < 0)
 712                         goto out_up_read;
 713         }
 714
 715         ret = 1;
 716         handle = NULL;
 717 out_up_read:
 718         up_read(&EXT4_I(inode)->xattr_sem);
 719 out:
 720         if (handle)
 721                 ext4_journal_stop(handle);
 722         brelse(iloc.bh);
 723         return ret;
 724 convert:
 725         return ext4_convert_inline_data_to_extent(mapping,
 726                                                   inode, flags);
 727 }
 728
 729 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 730                                unsigned copied, struct page *page)
 731 {
 732         int ret;
 733         void *kaddr;
 734         struct ext4_iloc iloc;
 735
 736         if (unlikely(copied < len)) {
 737                 if (!PageUptodate(page)) {
 738                         copied = 0;
 739                         goto out;
 740                 }
 741         }
 742
 743         ret = ext4_get_inode_loc(inode, &iloc);
 744         if (ret) {
 745                 ext4_std_error(inode->i_sb, ret);
 746                 copied = 0;
 747                 goto out;
 748         }
 749
 750         down_write(&EXT4_I(inode)->xattr_sem);
 751         BUG_ON(!ext4_has_inline_data(inode));
 752
 753         kaddr = kmap_atomic(page);
 754         ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
 755         kunmap_atomic(kaddr);
 756         SetPageUptodate(page);
 757         /* clear page dirty so that writepages wouldn't work for us. */
 758         ClearPageDirty(page);
 759
 760         up_write(&EXT4_I(inode)->xattr_sem);
 761         brelse(iloc.bh);
 762 out:
 763         return copied;
 764 }
 765
 766 struct buffer_head *
 767 ext4_journalled_write_inline_data(struct inode *inode,
 768                                   unsigned len,
 769                                   struct page *page)
 770 {
 771         int ret;
 772         void *kaddr;
 773         struct ext4_iloc iloc;
 774
 775         ret = ext4_get_inode_loc(inode, &iloc);
 776         if (ret) {
 777                 ext4_std_error(inode->i_sb, ret);
 778                 return NULL;
 779         }
 780
 781         down_write(&EXT4_I(inode)->xattr_sem);
 782         kaddr = kmap_atomic(page);
 783         ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
 784         kunmap_atomic(kaddr);
 785         up_write(&EXT4_I(inode)->xattr_sem);
 786
 787         return iloc.bh;
 788 }
 789
 790 /*
 791  * Try to make the page cache and handle ready for the inline data case.
 792  * We can call this function in 2 cases:
 793  * 1. The inode is created and the first write exceeds inline size. We can
 794  *    clear the inode state safely.
 795  * 2. The inode has inline data, then we need to read the data, make it
 796  *    update and dirty so that ext4_da_writepages can handle it. We don't
 797  *    need to start the journal since the file's metatdata isn't changed now.
 798  */
 799 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 800                                                  struct inode *inode,
 801                                                  unsigned flags,
 802                                                  void **fsdata)
 803 {
 804         int ret = 0, inline_size;
 805         struct page *page;
 806
 807         page = grab_cache_page_write_begin(mapping, 0, flags);
 808         if (!page)
 809                 return -ENOMEM;
 810
 811         down_read(&EXT4_I(inode)->xattr_sem);
 812         if (!ext4_has_inline_data(inode)) {
 813                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 814                 goto out;
 815         }
 816
 817         inline_size = ext4_get_inline_size(inode);
 818
 819         if (!PageUptodate(page)) {
 820                 ret = ext4_read_inline_page(inode, page);
 821                 if (ret < 0)
 822                         goto out;
 823         }
 824
 825         ret = __block_write_begin(page, 0, inline_size,
 826                                   ext4_da_get_block_prep);
 827         if (ret) {
 828                 up_read(&EXT4_I(inode)->xattr_sem);
 829                 unlock_page(page);
 830                 put_page(page);
 831                 ext4_truncate_failed_write(inode);
 832                 return ret;
 833         }
 834
 835         SetPageDirty(page);
 836         SetPageUptodate(page);
 837         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 838         *fsdata = (void *)CONVERT_INLINE_DATA;
 839
 840 out:
 841         up_read(&EXT4_I(inode)->xattr_sem);
 842         if (page) {
 843                 unlock_page(page);
 844                 put_page(page);
 845         }
 846         return ret;
 847 }
 848
 849 /*
 850  * Prepare the write for the inline data.
 851  * If the the data can be written into the inode, we just read
 852  * the page and make it uptodate, and start the journal.
 853  * Otherwise read the page, makes it dirty so that it can be
 854  * handle in writepages(the i_disksize update is left to the
 855  * normal ext4_da_write_end).
 856  */
 857 int ext4_da_write_inline_data_begin(struct address_space *mapping,
 858                                     struct inode *inode,
 859                                     loff_t pos, unsigned len,
 860                                     unsigned flags,
 861                                     struct page **pagep,
 862                                     void **fsdata)
 863 {
 864         int ret, inline_size;
 865         handle_t *handle;
 866         struct page *page;
 867         struct ext4_iloc iloc;
 868         int retries;
 869
 870         ret = ext4_get_inode_loc(inode, &iloc);
 871         if (ret)
 872                 return ret;
 873
 874 retry_journal:
 875         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 876         if (IS_ERR(handle)) {
 877                 ret = PTR_ERR(handle);
 878                 goto out;
 879         }
 880
 881         inline_size = ext4_get_max_inline_size(inode);
 882
 883         ret = -ENOSPC;
 884         if (inline_size >= pos + len) {
 885                 ret = ext4_prepare_inline_data(handle, inode, pos + len);
 886                 if (ret && ret != -ENOSPC)
 887                         goto out_journal;
 888         }
 889
 890         /*
 891          * We cannot recurse into the filesystem as the transaction
 892          * is already started.
 893          */
 894         flags |= AOP_FLAG_NOFS;
 895
 896         if (ret == -ENOSPC) {
 897                 ret = ext4_da_convert_inline_data_to_extent(mapping,
 898                                                             inode,
 899                                                             flags,
 900                                                             fsdata);
 901                 ext4_journal_stop(handle);
 902                 if (ret == -ENOSPC &&
 903                     ext4_should_retry_alloc(inode->i_sb, &retries))
 904                         goto retry_journal;
 905                 goto out;
 906         }
 907
 908
 909         page = grab_cache_page_write_begin(mapping, 0, flags);
 910         if (!page) {
 911                 ret = -ENOMEM;
 912                 goto out_journal;
 913         }
 914
 915         down_read(&EXT4_I(inode)->xattr_sem);
 916         if (!ext4_has_inline_data(inode)) {
 917                 ret = 0;
 918                 goto out_release_page;
 919         }
 920
 921         if (!PageUptodate(page)) {
 922                 ret = ext4_read_inline_page(inode, page);
 923                 if (ret < 0)
 924                         goto out_release_page;
 925         }
 926
 927         up_read(&EXT4_I(inode)->xattr_sem);
 928         *pagep = page;
 929         brelse(iloc.bh);
 930         return 1;
 931 out_release_page:
 932         up_read(&EXT4_I(inode)->xattr_sem);
 933         unlock_page(page);
 934         put_page(page);
 935 out_journal:
 936         ext4_journal_stop(handle);
 937 out:
 938         brelse(iloc.bh);
 939         return ret;
 940 }
 941
 942 int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
 943                                   unsigned len, unsigned copied,
 944                                   struct page *page)
 945 {
 946         int i_size_changed = 0;
 947
 948         copied = ext4_write_inline_data_end(inode, pos, len, copied, page);
 949
 950         /*
 951          * No need to use i_size_read() here, the i_size
 952          * cannot change under us because we hold i_mutex.
 953          *
 954          * But it's important to update i_size while still holding page lock:
 955          * page writeout could otherwise come in and zero beyond i_size.
 956          */
 957         if (pos+copied > inode->i_size) {
 958                 i_size_write(inode, pos+copied);
 959                 i_size_changed = 1;
 960         }
 961         unlock_page(page);
 962         put_page(page);
 963
 964         /*
 965          * Don't mark the inode dirty under page lock. First, it unnecessarily
 966          * makes the holding time of page lock longer. Second, it forces lock
 967          * ordering of page lock and transaction start for journaling
 968          * filesystems.
 969          */
 970         if (i_size_changed)
 971                 mark_inode_dirty(inode);
 972
 973         return copied;
 974 }
 975
 976 #ifdef INLINE_DIR_DEBUG
 977 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
 978                           void *inline_start, int inline_size)
 979 {
 980         int offset;
 981         unsigned short de_len;
 982         struct ext4_dir_entry_2 *de = inline_start;
 983         void *dlimit = inline_start + inline_size;
 984
 985         trace_printk("inode %lu\n", dir->i_ino);
 986         offset = 0;
 987         while ((void *)de < dlimit) {
 988                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
 989                 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
 990                              offset, de_len, de->name_len, de->name,
 991                              de->name_len, le32_to_cpu(de->inode));
 992                 if (ext4_check_dir_entry(dir, NULL, de, bh,
 993                                          inline_start, inline_size, offset))
 994                         BUG();
 995
 996                 offset += de_len;
 997                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
 998         }
 999 }
1000 #else
1001 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
1002 #endif
1003
1004 /*
1005  * Add a new entry into a inline dir.
1006  * It will return -ENOSPC if no space is available, and -EIO
1007  * and -EEXIST if directory entry already exists.
1008  */
1009 static int ext4_add_dirent_to_inline(handle_t *handle,
1010                                      struct ext4_filename *fname,
1011                                      struct inode *dir,
1012                                      struct inode *inode,
1013                                      struct ext4_iloc *iloc,
1014                                      void *inline_start, int inline_size)
1015 {
1016         int             err;
1017         struct ext4_dir_entry_2 *de;
1018
1019         err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1020                                 inline_size, fname, &de);
1021         if (err)
1022                 return err;
1023
1024         BUFFER_TRACE(iloc->bh, "get_write_access");
1025         err = ext4_journal_get_write_access(handle, iloc->bh);
1026         if (err)
1027                 return err;
1028         ext4_insert_dentry(dir, inode, de, inline_size, fname);
1029
1030         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1031
1032         /*
1033          * XXX shouldn't update any times until successful
1034          * completion of syscall, but too many callers depend
1035          * on this.
1036          *
1037          * XXX similarly, too many callers depend on
1038          * ext4_new_inode() setting the times, but error
1039          * recovery deletes the inode, so the worst that can
1040          * happen is that the times are slightly out of date
1041          * and/or different from the directory change time.
1042          */
1043         dir->i_mtime = dir->i_ctime = current_time(dir);
1044         ext4_update_dx_flag(dir);
1045         dir->i_version++;
1046         ext4_mark_inode_dirty(handle, dir);
1047         return 1;
1048 }
1049
1050 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1051                                        struct ext4_iloc *iloc)
1052 {
1053         struct ext4_xattr_entry *entry;
1054         struct ext4_xattr_ibody_header *header;
1055
1056         BUG_ON(!EXT4_I(inode)->i_inline_off);
1057
1058         header = IHDR(inode, ext4_raw_inode(iloc));
1059         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1060                                             EXT4_I(inode)->i_inline_off);
1061
1062         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1063 }
1064
1065 /* Set the final de to cover the whole block. */
1066 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1067 {
1068         struct ext4_dir_entry_2 *de, *prev_de;
1069         void *limit;
1070         int de_len;
1071
1072         de = (struct ext4_dir_entry_2 *)de_buf;
1073         if (old_size) {
1074                 limit = de_buf + old_size;
1075                 do {
1076                         prev_de = de;
1077                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1078                         de_buf += de_len;
1079                         de = (struct ext4_dir_entry_2 *)de_buf;
1080                 } while (de_buf < limit);
1081
1082                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1083                                                         old_size, new_size);
1084         } else {
1085                 /* this is just created, so create an empty entry. */
1086                 de->inode = 0;
1087                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1088         }
1089 }
1090
1091 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1092                                   struct ext4_iloc *iloc)
1093 {
1094         int ret;
1095         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1096         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1097
1098         if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1099                 return -ENOSPC;
1100
1101         ret = ext4_update_inline_data(handle, dir,
1102                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1103         if (ret)
1104                 return ret;
1105
1106         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1107                              EXT4_I(dir)->i_inline_size -
1108                                                 EXT4_MIN_INLINE_DATA_SIZE);
1109         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1110         return 0;
1111 }
1112
1113 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1114                                      struct ext4_iloc *iloc,
1115                                      void *buf, int inline_size)
1116 {
1117         ext4_create_inline_data(handle, inode, inline_size);
1118         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1119         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1120 }
1121
1122 static int ext4_finish_convert_inline_dir(handle_t *handle,
1123                                           struct inode *inode,
1124                                           struct buffer_head *dir_block,
1125                                           void *buf,
1126                                           int inline_size)
1127 {
1128         int err, csum_size = 0, header_size = 0;
1129         struct ext4_dir_entry_2 *de;
1130         struct ext4_dir_entry_tail *t;
1131         void *target = dir_block->b_data;
1132
1133         /*
1134          * First create "." and ".." and then copy the dir information
1135          * back to the block.
1136          */
1137         de = (struct ext4_dir_entry_2 *)target;
1138         de = ext4_init_dot_dotdot(inode, de,
1139                 inode->i_sb->s_blocksize, csum_size,
1140                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1141         header_size = (void *)de - target;
1142
1143         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1144                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1145
1146         if (ext4_has_metadata_csum(inode->i_sb))
1147                 csum_size = sizeof(struct ext4_dir_entry_tail);
1148
1149         inode->i_size = inode->i_sb->s_blocksize;
1150         i_size_write(inode, inode->i_sb->s_blocksize);
1151         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1152         ext4_update_final_de(dir_block->b_data,
1153                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1154                         inode->i_sb->s_blocksize - csum_size);
1155
1156         if (csum_size) {
1157                 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1158                                      inode->i_sb->s_blocksize);
1159                 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1160         }
1161         set_buffer_uptodate(dir_block);
1162         err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1163         if (err)
1164                 goto out;
1165         set_buffer_verified(dir_block);
1166 out:
1167         return err;
1168 }
1169
1170 static int ext4_convert_inline_data_nolock(handle_t *handle,
1171                                            struct inode *inode,
1172                                            struct ext4_iloc *iloc)
1173 {
1174         int error;
1175         void *buf = NULL;
1176         struct buffer_head *data_bh = NULL;
1177         struct ext4_map_blocks map;
1178         int inline_size;
1179
1180         inline_size = ext4_get_inline_size(inode);
1181         buf = kmalloc(inline_size, GFP_NOFS);
1182         if (!buf) {
1183                 error = -ENOMEM;
1184                 goto out;
1185         }
1186
1187         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1188         if (error < 0)
1189                 goto out;
1190
1191         /*
1192          * Make sure the inline directory entries pass checks before we try to
1193          * convert them, so that we avoid touching stuff that needs fsck.
1194          */
1195         if (S_ISDIR(inode->i_mode)) {
1196                 error = ext4_check_all_de(inode, iloc->bh,
1197                                         buf + EXT4_INLINE_DOTDOT_SIZE,
1198                                         inline_size - EXT4_INLINE_DOTDOT_SIZE);
1199                 if (error)
1200                         goto out;
1201         }
1202
1203         error = ext4_destroy_inline_data_nolock(handle, inode);
1204         if (error)
1205                 goto out;
1206
1207         map.m_lblk = 0;
1208         map.m_len = 1;
1209         map.m_flags = 0;
1210         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1211         if (error < 0)
1212                 goto out_restore;
1213         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1214                 error = -EIO;
1215                 goto out_restore;
1216         }
1217
1218         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1219         if (!data_bh) {
1220                 error = -ENOMEM;
1221                 goto out_restore;
1222         }
1223
1224         lock_buffer(data_bh);
1225         error = ext4_journal_get_create_access(handle, data_bh);
1226         if (error) {
1227                 unlock_buffer(data_bh);
1228                 error = -EIO;
1229                 goto out_restore;
1230         }
1231         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1232
1233         if (!S_ISDIR(inode->i_mode)) {
1234                 memcpy(data_bh->b_data, buf, inline_size);
1235                 set_buffer_uptodate(data_bh);
1236                 error = ext4_handle_dirty_metadata(handle,
1237                                                    inode, data_bh);
1238         } else {
1239                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1240                                                        buf, inline_size);
1241         }
1242
1243         unlock_buffer(data_bh);
1244 out_restore:
1245         if (error)
1246                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1247
1248 out:
1249         brelse(data_bh);
1250         kfree(buf);
1251         return error;
1252 }
1253
1254 /*
1255  * Try to add the new entry to the inline data.
1256  * If succeeds, return 0. If not, extended the inline dir and copied data to
1257  * the new created block.
1258  */
1259 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1260                               struct inode *dir, struct inode *inode)
1261 {
1262         int ret, inline_size;
1263         void *inline_start;
1264         struct ext4_iloc iloc;
1265
1266         ret = ext4_get_inode_loc(dir, &iloc);
1267         if (ret)
1268                 return ret;
1269
1270         down_write(&EXT4_I(dir)->xattr_sem);
1271         if (!ext4_has_inline_data(dir))
1272                 goto out;
1273
1274         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1275                                                  EXT4_INLINE_DOTDOT_SIZE;
1276         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1277
1278         ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1279                                         inline_start, inline_size);
1280         if (ret != -ENOSPC)
1281                 goto out;
1282
1283         /* check whether it can be inserted to inline xattr space. */
1284         inline_size = EXT4_I(dir)->i_inline_size -
1285                         EXT4_MIN_INLINE_DATA_SIZE;
1286         if (!inline_size) {
1287                 /* Try to use the xattr space.*/
1288                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1289                 if (ret && ret != -ENOSPC)
1290                         goto out;
1291
1292                 inline_size = EXT4_I(dir)->i_inline_size -
1293                                 EXT4_MIN_INLINE_DATA_SIZE;
1294         }
1295
1296         if (inline_size) {
1297                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1298
1299                 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1300                                                 inode, &iloc, inline_start,
1301                                                 inline_size);
1302
1303                 if (ret != -ENOSPC)
1304                         goto out;
1305         }
1306
1307         /*
1308          * The inline space is filled up, so create a new block for it.
1309          * As the extent tree will be created, we have to save the inline
1310          * dir first.
1311          */
1312         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1313
1314 out:
1315         ext4_mark_inode_dirty(handle, dir);
1316         up_write(&EXT4_I(dir)->xattr_sem);
1317         brelse(iloc.bh);
1318         return ret;
1319 }
1320
1321 /*
1322  * This function fills a red-black tree with information from an
1323  * inlined dir.  It returns the number directory entries loaded
1324  * into the tree.  If there is an error it is returned in err.
1325  */
1326 int htree_inlinedir_to_tree(struct file *dir_file,
1327                             struct inode *dir, ext4_lblk_t block,
1328                             struct dx_hash_info *hinfo,
1329                             __u32 start_hash, __u32 start_minor_hash,
1330                             int *has_inline_data)
1331 {
1332         int err = 0, count = 0;
1333         unsigned int parent_ino;
1334         int pos;
1335         struct ext4_dir_entry_2 *de;
1336         struct inode *inode = file_inode(dir_file);
1337         int ret, inline_size = 0;
1338         struct ext4_iloc iloc;
1339         void *dir_buf = NULL;
1340         struct ext4_dir_entry_2 fake;
1341         struct fscrypt_str tmp_str;
1342
1343         ret = ext4_get_inode_loc(inode, &iloc);
1344         if (ret)
1345                 return ret;
1346
1347         down_read(&EXT4_I(inode)->xattr_sem);
1348         if (!ext4_has_inline_data(inode)) {
1349                 up_read(&EXT4_I(inode)->xattr_sem);
1350                 *has_inline_data = 0;
1351                 goto out;
1352         }
1353
1354         inline_size = ext4_get_inline_size(inode);
1355         dir_buf = kmalloc(inline_size, GFP_NOFS);
1356         if (!dir_buf) {
1357                 ret = -ENOMEM;
1358                 up_read(&EXT4_I(inode)->xattr_sem);
1359                 goto out;
1360         }
1361
1362         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1363         up_read(&EXT4_I(inode)->xattr_sem);
1364         if (ret < 0)
1365                 goto out;
1366
1367         pos = 0;
1368         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1369         while (pos < inline_size) {
1370                 /*
1371                  * As inlined dir doesn't store any information about '.' and
1372                  * only the inode number of '..' is stored, we have to handle
1373                  * them differently.
1374                  */
1375                 if (pos == 0) {
1376                         fake.inode = cpu_to_le32(inode->i_ino);
1377                         fake.name_len = 1;
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_OFFSET;
1385                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1386                         fake.inode = cpu_to_le32(parent_ino);
1387                         fake.name_len = 2;
1388                         strcpy(fake.name, "..");
1389                         fake.rec_len = ext4_rec_len_to_disk(
1390                                                 EXT4_DIR_REC_LEN(fake.name_len),
1391                                                 inline_size);
1392                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1393                         de = &fake;
1394                         pos = EXT4_INLINE_DOTDOT_SIZE;
1395                 } else {
1396                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1397                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1398                         if (ext4_check_dir_entry(inode, dir_file, de,
1399                                          iloc.bh, dir_buf,
1400                                          inline_size, pos)) {
1401                                 ret = count;
1402                                 goto out;
1403                         }
1404                 }
1405
1406                 ext4fs_dirhash(de->name, de->name_len, hinfo);
1407                 if ((hinfo->hash < start_hash) ||
1408                     ((hinfo->hash == start_hash) &&
1409                      (hinfo->minor_hash < start_minor_hash)))
1410                         continue;
1411                 if (de->inode == 0)
1412                         continue;
1413                 tmp_str.name = de->name;
1414                 tmp_str.len = de->name_len;
1415                 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1416                                               hinfo->minor_hash, de, &tmp_str);
1417                 if (err) {
1418                         count = err;
1419                         goto out;
1420                 }
1421                 count++;
1422         }
1423         ret = count;
1424 out:
1425         kfree(dir_buf);
1426         brelse(iloc.bh);
1427         return ret;
1428 }
1429
1430 /*
1431  * So this function is called when the volume is mkfsed with
1432  * dir_index disabled. In order to keep f_pos persistent
1433  * after we convert from an inlined dir to a blocked based,
1434  * we just pretend that we are a normal dir and return the
1435  * offset as if '.' and '..' really take place.
1436  *
1437  */
1438 int ext4_read_inline_dir(struct file *file,
1439                          struct dir_context *ctx,
1440                          int *has_inline_data)
1441 {
1442         unsigned int offset, parent_ino;
1443         int i;
1444         struct ext4_dir_entry_2 *de;
1445         struct super_block *sb;
1446         struct inode *inode = file_inode(file);
1447         int ret, inline_size = 0;
1448         struct ext4_iloc iloc;
1449         void *dir_buf = NULL;
1450         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1451
1452         ret = ext4_get_inode_loc(inode, &iloc);
1453         if (ret)
1454                 return ret;
1455
1456         down_read(&EXT4_I(inode)->xattr_sem);
1457         if (!ext4_has_inline_data(inode)) {
1458                 up_read(&EXT4_I(inode)->xattr_sem);
1459                 *has_inline_data = 0;
1460                 goto out;
1461         }
1462
1463         inline_size = ext4_get_inline_size(inode);
1464         dir_buf = kmalloc(inline_size, GFP_NOFS);
1465         if (!dir_buf) {
1466                 ret = -ENOMEM;
1467                 up_read(&EXT4_I(inode)->xattr_sem);
1468                 goto out;
1469         }
1470
1471         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1472         up_read(&EXT4_I(inode)->xattr_sem);
1473         if (ret < 0)
1474                 goto out;
1475
1476         ret = 0;
1477         sb = inode->i_sb;
1478         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1479         offset = ctx->pos;
1480
1481         /*
1482          * dotdot_offset and dotdot_size is the real offset and
1483          * size for ".." and "." if the dir is block based while
1484          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1485          * So we will use extra_offset and extra_size to indicate them
1486          * during the inline dir iteration.
1487          */
1488         dotdot_offset = EXT4_DIR_REC_LEN(1);
1489         dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1490         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1491         extra_size = extra_offset + inline_size;
1492
1493         /*
1494          * If the version has changed since the last call to
1495          * readdir(2), then we might be pointing to an invalid
1496          * dirent right now.  Scan from the start of the inline
1497          * dir to make sure.
1498          */
1499         if (file->f_version != inode->i_version) {
1500                 for (i = 0; i < extra_size && i < offset;) {
1501                         /*
1502                          * "." is with offset 0 and
1503                          * ".." is dotdot_offset.
1504                          */
1505                         if (!i) {
1506                                 i = dotdot_offset;
1507                                 continue;
1508                         } else if (i == dotdot_offset) {
1509                                 i = dotdot_size;
1510                                 continue;
1511                         }
1512                         /* for other entry, the real offset in
1513                          * the buf has to be tuned accordingly.
1514                          */
1515                         de = (struct ext4_dir_entry_2 *)
1516                                 (dir_buf + i - extra_offset);
1517                         /* It's too expensive to do a full
1518                          * dirent test each time round this
1519                          * loop, but we do have to test at
1520                          * least that it is non-zero.  A
1521                          * failure will be detected in the
1522                          * dirent test below. */
1523                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1524                                 < EXT4_DIR_REC_LEN(1))
1525                                 break;
1526                         i += ext4_rec_len_from_disk(de->rec_len,
1527                                                     extra_size);
1528                 }
1529                 offset = i;
1530                 ctx->pos = offset;
1531                 file->f_version = inode->i_version;
1532         }
1533
1534         while (ctx->pos < extra_size) {
1535                 if (ctx->pos == 0) {
1536                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1537                                 goto out;
1538                         ctx->pos = dotdot_offset;
1539                         continue;
1540                 }
1541
1542                 if (ctx->pos == dotdot_offset) {
1543                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1544                                 goto out;
1545                         ctx->pos = dotdot_size;
1546                         continue;
1547                 }
1548
1549                 de = (struct ext4_dir_entry_2 *)
1550                         (dir_buf + ctx->pos - extra_offset);
1551                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1552                                          extra_size, ctx->pos))
1553                         goto out;
1554                 if (le32_to_cpu(de->inode)) {
1555                         if (!dir_emit(ctx, de->name, de->name_len,
1556                                       le32_to_cpu(de->inode),
1557                                       get_dtype(sb, de->file_type)))
1558                                 goto out;
1559                 }
1560                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1561         }
1562 out:
1563         kfree(dir_buf);
1564         brelse(iloc.bh);
1565         return ret;
1566 }
1567
1568 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1569                                         struct ext4_dir_entry_2 **parent_de,
1570                                         int *retval)
1571 {
1572         struct ext4_iloc iloc;
1573
1574         *retval = ext4_get_inode_loc(inode, &iloc);
1575         if (*retval)
1576                 return NULL;
1577
1578         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1579
1580         return iloc.bh;
1581 }
1582
1583 /*
1584  * Try to create the inline data for the new dir.
1585  * If it succeeds, return 0, otherwise return the error.
1586  * In case of ENOSPC, the caller should create the normal disk layout dir.
1587  */
1588 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1589                                struct inode *inode)
1590 {
1591         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1592         struct ext4_iloc iloc;
1593         struct ext4_dir_entry_2 *de;
1594
1595         ret = ext4_get_inode_loc(inode, &iloc);
1596         if (ret)
1597                 return ret;
1598
1599         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1600         if (ret)
1601                 goto out;
1602
1603         /*
1604          * For inline dir, we only save the inode information for the ".."
1605          * and create a fake dentry to cover the left space.
1606          */
1607         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1608         de->inode = cpu_to_le32(parent->i_ino);
1609         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1610         de->inode = 0;
1611         de->rec_len = ext4_rec_len_to_disk(
1612                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1613                                 inline_size);
1614         set_nlink(inode, 2);
1615         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1616 out:
1617         brelse(iloc.bh);
1618         return ret;
1619 }
1620
1621 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1622                                         struct ext4_filename *fname,
1623                                         const struct qstr *d_name,
1624                                         struct ext4_dir_entry_2 **res_dir,
1625                                         int *has_inline_data)
1626 {
1627         int ret;
1628         struct ext4_iloc iloc;
1629         void *inline_start;
1630         int inline_size;
1631
1632         if (ext4_get_inode_loc(dir, &iloc))
1633                 return NULL;
1634
1635         down_read(&EXT4_I(dir)->xattr_sem);
1636         if (!ext4_has_inline_data(dir)) {
1637                 *has_inline_data = 0;
1638                 goto out;
1639         }
1640
1641         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1642                                                 EXT4_INLINE_DOTDOT_SIZE;
1643         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1644         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1645                               dir, fname, d_name, 0, res_dir);
1646         if (ret == 1)
1647                 goto out_find;
1648         if (ret < 0)
1649                 goto out;
1650
1651         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1652                 goto out;
1653
1654         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1655         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1656
1657         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1658                               dir, fname, d_name, 0, res_dir);
1659         if (ret == 1)
1660                 goto out_find;
1661
1662 out:
1663         brelse(iloc.bh);
1664         iloc.bh = NULL;
1665 out_find:
1666         up_read(&EXT4_I(dir)->xattr_sem);
1667         return iloc.bh;
1668 }
1669
1670 int ext4_delete_inline_entry(handle_t *handle,
1671                              struct inode *dir,
1672                              struct ext4_dir_entry_2 *de_del,
1673                              struct buffer_head *bh,
1674                              int *has_inline_data)
1675 {
1676         int err, inline_size;
1677         struct ext4_iloc iloc;
1678         void *inline_start;
1679
1680         err = ext4_get_inode_loc(dir, &iloc);
1681         if (err)
1682                 return err;
1683
1684         down_write(&EXT4_I(dir)->xattr_sem);
1685         if (!ext4_has_inline_data(dir)) {
1686                 *has_inline_data = 0;
1687                 goto out;
1688         }
1689
1690         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1691                 EXT4_MIN_INLINE_DATA_SIZE) {
1692                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1693                                         EXT4_INLINE_DOTDOT_SIZE;
1694                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1695                                 EXT4_INLINE_DOTDOT_SIZE;
1696         } else {
1697                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1698                 inline_size = ext4_get_inline_size(dir) -
1699                                 EXT4_MIN_INLINE_DATA_SIZE;
1700         }
1701
1702         BUFFER_TRACE(bh, "get_write_access");
1703         err = ext4_journal_get_write_access(handle, bh);
1704         if (err)
1705                 goto out;
1706
1707         err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1708                                         inline_start, inline_size, 0);
1709         if (err)
1710                 goto out;
1711
1712         err = ext4_mark_inode_dirty(handle, dir);
1713         if (unlikely(err))
1714                 goto out;
1715
1716         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1717 out:
1718         up_write(&EXT4_I(dir)->xattr_sem);
1719         brelse(iloc.bh);
1720         if (err != -ENOENT)
1721                 ext4_std_error(dir->i_sb, err);
1722         return err;
1723 }
1724
1725 /*
1726  * Get the inline dentry at offset.
1727  */
1728 static inline struct ext4_dir_entry_2 *
1729 ext4_get_inline_entry(struct inode *inode,
1730                       struct ext4_iloc *iloc,
1731                       unsigned int offset,
1732                       void **inline_start,
1733                       int *inline_size)
1734 {
1735         void *inline_pos;
1736
1737         BUG_ON(offset > ext4_get_inline_size(inode));
1738
1739         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1740                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1741                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1742         } else {
1743                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1744                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1745                 *inline_size = ext4_get_inline_size(inode) -
1746                                 EXT4_MIN_INLINE_DATA_SIZE;
1747         }
1748
1749         if (inline_start)
1750                 *inline_start = inline_pos;
1751         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1752 }
1753
1754 bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1755 {
1756         int err, inline_size;
1757         struct ext4_iloc iloc;
1758         void *inline_pos;
1759         unsigned int offset;
1760         struct ext4_dir_entry_2 *de;
1761         bool ret = true;
1762
1763         err = ext4_get_inode_loc(dir, &iloc);
1764         if (err) {
1765                 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1766                                  err, dir->i_ino);
1767                 return true;
1768         }
1769
1770         down_read(&EXT4_I(dir)->xattr_sem);
1771         if (!ext4_has_inline_data(dir)) {
1772                 *has_inline_data = 0;
1773                 goto out;
1774         }
1775
1776         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1777         if (!le32_to_cpu(de->inode)) {
1778                 ext4_warning(dir->i_sb,
1779                              "bad inline directory (dir #%lu) - no `..'",
1780                              dir->i_ino);
1781                 ret = true;
1782                 goto out;
1783         }
1784
1785         offset = EXT4_INLINE_DOTDOT_SIZE;
1786         while (offset < dir->i_size) {
1787                 de = ext4_get_inline_entry(dir, &iloc, offset,
1788                                            &inline_pos, &inline_size);
1789                 if (ext4_check_dir_entry(dir, NULL, de,
1790                                          iloc.bh, inline_pos,
1791                                          inline_size, offset)) {
1792                         ext4_warning(dir->i_sb,
1793                                      "bad inline directory (dir #%lu) - "
1794                                      "inode %u, rec_len %u, name_len %d"
1795                                      "inline size %d",
1796                                      dir->i_ino, le32_to_cpu(de->inode),
1797                                      le16_to_cpu(de->rec_len), de->name_len,
1798                                      inline_size);
1799                         ret = true;
1800                         goto out;
1801                 }
1802                 if (le32_to_cpu(de->inode)) {
1803                         ret = false;
1804                         goto out;
1805                 }
1806                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1807         }
1808
1809 out:
1810         up_read(&EXT4_I(dir)->xattr_sem);
1811         brelse(iloc.bh);
1812         return ret;
1813 }
1814
1815 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1816 {
1817         int ret;
1818
1819         down_write(&EXT4_I(inode)->xattr_sem);
1820         ret = ext4_destroy_inline_data_nolock(handle, inode);
1821         up_write(&EXT4_I(inode)->xattr_sem);
1822
1823         return ret;
1824 }
1825
1826 int ext4_inline_data_fiemap(struct inode *inode,
1827                             struct fiemap_extent_info *fieinfo,
1828                             int *has_inline, __u64 start, __u64 len)
1829 {
1830         __u64 physical = 0;
1831         __u64 inline_len;
1832         __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
1833                 FIEMAP_EXTENT_LAST;
1834         int error = 0;
1835         struct ext4_iloc iloc;
1836
1837         down_read(&EXT4_I(inode)->xattr_sem);
1838         if (!ext4_has_inline_data(inode)) {
1839                 *has_inline = 0;
1840                 goto out;
1841         }
1842         inline_len = min_t(size_t, ext4_get_inline_size(inode),
1843                            i_size_read(inode));
1844         if (start >= inline_len)
1845                 goto out;
1846         if (start + len < inline_len)
1847                 inline_len = start + len;
1848         inline_len -= start;
1849
1850         error = ext4_get_inode_loc(inode, &iloc);
1851         if (error)
1852                 goto out;
1853
1854         physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1855         physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1856         physical += offsetof(struct ext4_inode, i_block);
1857
1858         if (physical)
1859                 error = fiemap_fill_next_extent(fieinfo, start, physical,
1860                                                 inline_len, flags);
1861         brelse(iloc.bh);
1862 out:
1863         up_read(&EXT4_I(inode)->xattr_sem);
1864         return (error < 0 ? error : 0);
1865 }
1866
1867 /*
1868  * Called during xattr set, and if we can sparse space 'needed',
1869  * just create the extent tree evict the data to the outer block.
1870  *
1871  * We use jbd2 instead of page cache to move data to the 1st block
1872  * so that the whole transaction can be committed as a whole and
1873  * the data isn't lost because of the delayed page cache write.
1874  */
1875 int ext4_try_to_evict_inline_data(handle_t *handle,
1876                                   struct inode *inode,
1877                                   int needed)
1878 {
1879         int error;
1880         struct ext4_xattr_entry *entry;
1881         struct ext4_inode *raw_inode;
1882         struct ext4_iloc iloc;
1883
1884         error = ext4_get_inode_loc(inode, &iloc);
1885         if (error)
1886                 return error;
1887
1888         raw_inode = ext4_raw_inode(&iloc);
1889         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
1890                                             EXT4_I(inode)->i_inline_off);
1891         if (EXT4_XATTR_LEN(entry->e_name_len) +
1892             EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
1893                 error = -ENOSPC;
1894                 goto out;
1895         }
1896
1897         error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1898 out:
1899         brelse(iloc.bh);
1900         return error;
1901 }
1902
1903 void ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1904 {
1905         handle_t *handle;
1906         int inline_size, value_len, needed_blocks;
1907         size_t i_size;
1908         void *value = NULL;
1909         struct ext4_xattr_ibody_find is = {
1910                 .s = { .not_found = -ENODATA, },
1911         };
1912         struct ext4_xattr_info i = {
1913                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1914                 .name = EXT4_XATTR_SYSTEM_DATA,
1915         };
1916
1917
1918         needed_blocks = ext4_writepage_trans_blocks(inode);
1919         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1920         if (IS_ERR(handle))
1921                 return;
1922
1923         down_write(&EXT4_I(inode)->xattr_sem);
1924         if (!ext4_has_inline_data(inode)) {
1925                 *has_inline = 0;
1926                 ext4_journal_stop(handle);
1927                 return;
1928         }
1929
1930         if (ext4_orphan_add(handle, inode))
1931                 goto out;
1932
1933         if (ext4_get_inode_loc(inode, &is.iloc))
1934                 goto out;
1935
1936         down_write(&EXT4_I(inode)->i_data_sem);
1937         i_size = inode->i_size;
1938         inline_size = ext4_get_inline_size(inode);
1939         EXT4_I(inode)->i_disksize = i_size;
1940
1941         if (i_size < inline_size) {
1942                 /* Clear the content in the xattr space. */
1943                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1944                         if (ext4_xattr_ibody_find(inode, &i, &is))
1945                                 goto out_error;
1946
1947                         BUG_ON(is.s.not_found);
1948
1949                         value_len = le32_to_cpu(is.s.here->e_value_size);
1950                         value = kmalloc(value_len, GFP_NOFS);
1951                         if (!value)
1952                                 goto out_error;
1953
1954                         if (ext4_xattr_ibody_get(inode, i.name_index, i.name,
1955                                                 value, value_len))
1956                                 goto out_error;
1957
1958                         i.value = value;
1959                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1960                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1961                         if (ext4_xattr_ibody_inline_set(handle, inode, &i, &is))
1962                                 goto out_error;
1963                 }
1964
1965                 /* Clear the content within i_blocks. */
1966                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1967                         void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1968                         memset(p + i_size, 0,
1969                                EXT4_MIN_INLINE_DATA_SIZE - i_size);
1970                 }
1971
1972                 EXT4_I(inode)->i_inline_size = i_size <
1973                                         EXT4_MIN_INLINE_DATA_SIZE ?
1974                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
1975         }
1976
1977 out_error:
1978         up_write(&EXT4_I(inode)->i_data_sem);
1979 out:
1980         brelse(is.iloc.bh);
1981         up_write(&EXT4_I(inode)->xattr_sem);
1982         kfree(value);
1983         if (inode->i_nlink)
1984                 ext4_orphan_del(handle, inode);
1985
1986         inode->i_mtime = inode->i_ctime = current_time(inode);
1987         ext4_mark_inode_dirty(handle, inode);
1988         if (IS_SYNC(inode))
1989                 ext4_handle_sync(handle);
1990
1991         ext4_journal_stop(handle);
1992         return;
1993 }
1994
1995 int ext4_convert_inline_data(struct inode *inode)
1996 {
1997         int error, needed_blocks;
1998         handle_t *handle;
1999         struct ext4_iloc iloc;
2000
2001         if (!ext4_has_inline_data(inode)) {
2002                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2003                 return 0;
2004         }
2005
2006         needed_blocks = ext4_writepage_trans_blocks(inode);
2007
2008         iloc.bh = NULL;
2009         error = ext4_get_inode_loc(inode, &iloc);
2010         if (error)
2011                 return error;
2012
2013         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2014         if (IS_ERR(handle)) {
2015                 error = PTR_ERR(handle);
2016                 goto out_free;
2017         }
2018
2019         down_write(&EXT4_I(inode)->xattr_sem);
2020         if (!ext4_has_inline_data(inode)) {
2021                 up_write(&EXT4_I(inode)->xattr_sem);
2022                 goto out;
2023         }
2024
2025         error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2026         up_write(&EXT4_I(inode)->xattr_sem);
2027 out:
2028         ext4_journal_stop(handle);
2029 out_free:
2030         brelse(iloc.bh);
2031         return error;
2032 }